diff options
Diffstat (limited to 'drivers/spi')
136 files changed, 95024 insertions, 0 deletions
diff --git a/drivers/spi/Kconfig b/drivers/spi/Kconfig new file mode 100644 index 000000000..74ea6b6b5 --- /dev/null +++ b/drivers/spi/Kconfig @@ -0,0 +1,1053 @@ +# SPDX-License-Identifier: GPL-2.0-only +# +# SPI driver configuration +# +menuconfig SPI + bool "SPI support" + depends on HAS_IOMEM + help + The "Serial Peripheral Interface" is a low level synchronous + protocol. Chips that support SPI can have data transfer rates + up to several tens of Mbit/sec. Chips are addressed with a + controller and a chipselect. Most SPI slaves don't support + dynamic device discovery; some are even write-only or read-only. + + SPI is widely used by microcontrollers to talk with sensors, + eeprom and flash memory, codecs and various other controller + chips, analog to digital (and d-to-a) converters, and more. + MMC and SD cards can be accessed using SPI protocol; and for + DataFlash cards used in MMC sockets, SPI must always be used. + + SPI is one of a family of similar protocols using a four wire + interface (select, clock, data in, data out) including Microwire + (half duplex), SSP, SSI, and PSP. This driver framework should + work with most such devices and controllers. + +if SPI + +config SPI_DEBUG + bool "Debug support for SPI drivers" + depends on DEBUG_KERNEL + help + Say "yes" to enable debug messaging (like dev_dbg and pr_debug), + sysfs, and debugfs support in SPI controller and protocol drivers. + +# +# MASTER side ... talking to discrete SPI slave chips including microcontrollers +# + +config SPI_MASTER +# bool "SPI Master Support" + bool + default SPI + help + If your system has an master-capable SPI controller (which + provides the clock and chipselect), you can enable that + controller and the protocol drivers for the SPI slave chips + that are connected. + +if SPI_MASTER + +config SPI_MEM + bool "SPI memory extension" + help + Enable this option if you want to enable the SPI memory extension. + This extension is meant to simplify interaction with SPI memories + by providing a high-level interface to send memory-like commands. + +comment "SPI Master Controller Drivers" + +config SPI_ALTERA + tristate "Altera SPI Controller" + select REGMAP_MMIO + help + This is the driver for the Altera SPI Controller. + +config SPI_AR934X + tristate "Qualcomm Atheros AR934X/QCA95XX SPI controller driver" + depends on ATH79 || COMPILE_TEST + help + This enables support for the SPI controller present on the + Qualcomm Atheros AR934X/QCA95XX SoCs. + +config SPI_ATH79 + tristate "Atheros AR71XX/AR724X/AR913X SPI controller driver" + depends on ATH79 || COMPILE_TEST + select SPI_BITBANG + help + This enables support for the SPI controller present on the + Atheros AR71XX/AR724X/AR913X SoCs. + +config SPI_ARMADA_3700 + tristate "Marvell Armada 3700 SPI Controller" + depends on (ARCH_MVEBU && OF) || COMPILE_TEST + help + This enables support for the SPI controller present on the + Marvell Armada 3700 SoCs. + +config SPI_ATMEL + tristate "Atmel SPI Controller" + depends on ARCH_AT91 || COMPILE_TEST + depends on OF + help + This selects a driver for the Atmel SPI Controller, present on + many AT91 ARM chips. + +config SPI_AT91_USART + tristate "Atmel USART Controller SPI driver" + depends on (ARCH_AT91 || COMPILE_TEST) + depends on MFD_AT91_USART + help + This selects a driver for the AT91 USART Controller as SPI Master, + present on AT91 and SAMA5 SoC series. + +config SPI_ATMEL_QUADSPI + tristate "Atmel Quad SPI Controller" + depends on ARCH_AT91 || COMPILE_TEST + depends on OF && HAS_IOMEM + help + This enables support for the Quad SPI controller in master mode. + This driver does not support generic SPI. The implementation only + supports spi-mem interface. + +config SPI_AU1550 + tristate "Au1550/Au1200/Au1300 SPI Controller" + depends on MIPS_ALCHEMY + select SPI_BITBANG + help + If you say yes to this option, support will be included for the + PSC SPI controller found on Au1550, Au1200 and Au1300 series. + +config SPI_AXI_SPI_ENGINE + tristate "Analog Devices AXI SPI Engine controller" + depends on HAS_IOMEM + help + This enables support for the Analog Devices AXI SPI Engine SPI controller. + It is part of the SPI Engine framework that is used in some Analog Devices + reference designs for FPGAs. + +config SPI_BCM2835 + tristate "BCM2835 SPI controller" + depends on GPIOLIB + depends on ARCH_BCM2835 || ARCH_BRCMSTB || COMPILE_TEST + help + This selects a driver for the Broadcom BCM2835 SPI master. + + The BCM2835 contains two types of SPI master controller; the + "universal SPI master", and the regular SPI controller. This driver + is for the regular SPI controller. Slave mode operation is not also + not supported. + +config SPI_BCM2835AUX + tristate "BCM2835 SPI auxiliary controller" + depends on ((ARCH_BCM2835 || ARCH_BRCMSTB) && GPIOLIB) || COMPILE_TEST + help + This selects a driver for the Broadcom BCM2835 SPI aux master. + + The BCM2835 contains two types of SPI master controller; the + "universal SPI master", and the regular SPI controller. + This driver is for the universal/auxiliary SPI controller. + +config SPI_BCM63XX + tristate "Broadcom BCM63xx SPI controller" + depends on BCM63XX || BMIPS_GENERIC || COMPILE_TEST + help + Enable support for the SPI controller on the Broadcom BCM63xx SoCs. + +config SPI_BCM63XX_HSSPI + tristate "Broadcom BCM63XX HS SPI controller driver" + depends on BCM63XX || BMIPS_GENERIC || ARCH_BCM_63XX || COMPILE_TEST + help + This enables support for the High Speed SPI controller present on + newer Broadcom BCM63XX SoCs. + +config SPI_BCM_QSPI + tristate "Broadcom BSPI and MSPI controller support" + depends on ARCH_BRCMSTB || ARCH_BCM || ARCH_BCM_IPROC || \ + BMIPS_GENERIC || COMPILE_TEST + default ARCH_BCM_IPROC + help + Enables support for the Broadcom SPI flash and MSPI controller. + Select this option for any one of BRCMSTB, iProc NSP and NS2 SoCs + based platforms. This driver works for both SPI master for SPI NOR + flash device as well as MSPI device. + +config SPI_BITBANG + tristate "Utilities for Bitbanging SPI masters" + help + With a few GPIO pins, your system can bitbang the SPI protocol. + Select this to get SPI support through I/O pins (GPIO, parallel + port, etc). Or, some systems' SPI master controller drivers use + this code to manage the per-word or per-transfer accesses to the + hardware shift registers. + + This is library code, and is automatically selected by drivers that + need it. You only need to select this explicitly to support driver + modules that aren't part of this kernel tree. + +config SPI_BUTTERFLY + tristate "Parallel port adapter for AVR Butterfly (DEVELOPMENT)" + depends on PARPORT + select SPI_BITBANG + help + This uses a custom parallel port cable to connect to an AVR + Butterfly <http://www.atmel.com/products/avr/butterfly>, an + inexpensive battery powered microcontroller evaluation board. + This same cable can be used to flash new firmware. + +config SPI_CADENCE + tristate "Cadence SPI controller" + help + This selects the Cadence SPI controller master driver + used by Xilinx Zynq and ZynqMP. + +config SPI_CADENCE_QUADSPI + tristate "Cadence Quad SPI controller" + depends on OF && (ARM || ARM64 || COMPILE_TEST) + help + Enable support for the Cadence Quad SPI Flash controller. + + Cadence QSPI is a specialized controller for connecting an SPI + Flash over 1/2/4-bit wide bus. Enable this option if you have a + device with a Cadence QSPI controller and want to access the + Flash as an MTD device. + +config SPI_CLPS711X + tristate "CLPS711X host SPI controller" + depends on ARCH_CLPS711X || COMPILE_TEST + help + This enables dedicated general purpose SPI/Microwire1-compatible + master mode interface (SSI1) for CLPS711X-based CPUs. + +config SPI_COLDFIRE_QSPI + tristate "Freescale Coldfire QSPI controller" + depends on (M520x || M523x || M5249 || M525x || M527x || M528x || M532x) + help + This enables support for the Coldfire QSPI controller in master + mode. + +config SPI_DAVINCI + tristate "Texas Instruments DaVinci/DA8x/OMAP-L/AM1x SoC SPI controller" + depends on ARCH_DAVINCI || ARCH_KEYSTONE + select SPI_BITBANG + help + SPI master controller for DaVinci/DA8x/OMAP-L/AM1x SPI modules. + +config SPI_DESIGNWARE + tristate "DesignWare SPI controller core support" + imply SPI_MEM + help + general driver for SPI controller core from DesignWare + +if SPI_DESIGNWARE + +config SPI_DW_DMA + bool "DMA support for DW SPI controller" + +config SPI_DW_PCI + tristate "PCI interface driver for DW SPI core" + depends on PCI + +config SPI_DW_MMIO + tristate "Memory-mapped io interface driver for DW SPI core" + depends on HAS_IOMEM + +config SPI_DW_BT1 + tristate "Baikal-T1 SPI driver for DW SPI core" + depends on MIPS_BAIKAL_T1 || COMPILE_TEST + select MULTIPLEXER + help + Baikal-T1 SoC is equipped with three DW APB SSI-based MMIO SPI + controllers. Two of them are pretty much normal: with IRQ, DMA, + FIFOs of 64 words depth, 4x CSs, but the third one as being a + part of the Baikal-T1 System Boot Controller has got a very + limited resources: no IRQ, no DMA, only a single native + chip-select and Tx/Rx FIFO with just 8 words depth available. + The later one is normally connected to an external SPI-nor flash + of 128Mb (in general can be of bigger size). + +config SPI_DW_BT1_DIRMAP + bool "Directly mapped Baikal-T1 Boot SPI flash support" + depends on SPI_DW_BT1 + help + Directly mapped SPI flash memory is an interface specific to the + Baikal-T1 System Boot Controller. It is a 16MB MMIO region, which + can be used to access a peripheral memory device just by + reading/writing data from/to it. Note that the system APB bus + will stall during each IO from/to the dirmap region until the + operation is finished. So try not to use it concurrently with + time-critical tasks (like the SPI memory operations implemented + in this driver). + +endif + +config SPI_DLN2 + tristate "Diolan DLN-2 USB SPI adapter" + depends on MFD_DLN2 + help + If you say yes to this option, support will be included for Diolan + DLN2, a USB to SPI interface. + + This driver can also be built as a module. If so, the module + will be called spi-dln2. + +config SPI_EFM32 + tristate "EFM32 SPI controller" + depends on OF && ARM && (ARCH_EFM32 || COMPILE_TEST) + select SPI_BITBANG + help + Driver for the spi controller found on Energy Micro's EFM32 SoCs. + +config SPI_EP93XX + tristate "Cirrus Logic EP93xx SPI controller" + depends on ARCH_EP93XX || COMPILE_TEST + help + This enables using the Cirrus EP93xx SPI controller in master + mode. + +config SPI_FALCON + bool "Falcon SPI controller support" + depends on SOC_FALCON + help + The external bus unit (EBU) found on the FALC-ON SoC has SPI + emulation that is designed for serial flash access. This driver + has only been tested with m25p80 type chips. The hardware has no + support for other types of SPI peripherals. + +config SPI_FSI + tristate "FSI SPI driver" + depends on FSI + help + This enables support for the driver for FSI bus attached SPI + controllers. + +config SPI_FSL_LPSPI + tristate "Freescale i.MX LPSPI controller" + depends on ARCH_MXC || COMPILE_TEST + help + This enables Freescale i.MX LPSPI controllers in master mode. + +config SPI_FSL_QUADSPI + tristate "Freescale QSPI controller" + depends on ARCH_MXC || SOC_LS1021A || ARCH_LAYERSCAPE || COMPILE_TEST + depends on HAS_IOMEM + help + This enables support for the Quad SPI controller in master mode. + Up to four flash chips can be connected on two buses with two + chipselects each. + This controller does not support generic SPI messages. It only + supports the high-level SPI memory interface. + +config SPI_HISI_SFC_V3XX + tristate "HiSilicon SPI NOR Flash Controller for Hi16XX chipsets" + depends on (ARM64 && ACPI) || COMPILE_TEST + depends on HAS_IOMEM + help + This enables support for HiSilicon v3xx SPI NOR flash controller + found in hi16xx chipsets. + +config SPI_NXP_FLEXSPI + tristate "NXP Flex SPI controller" + depends on ARCH_LAYERSCAPE || HAS_IOMEM + help + This enables support for the Flex SPI controller in master mode. + Up to four slave devices can be connected on two buses with two + chipselects each. + This controller does not support generic SPI messages and only + supports the high-level SPI memory interface. + +config SPI_GPIO + tristate "GPIO-based bitbanging SPI Master" + depends on GPIOLIB || COMPILE_TEST + select SPI_BITBANG + help + This simple GPIO bitbanging SPI master uses the arch-neutral GPIO + interface to manage MOSI, MISO, SCK, and chipselect signals. SPI + slaves connected to a bus using this driver are configured as usual, + except that the spi_board_info.controller_data holds the GPIO number + for the chipselect used by this controller driver. + + Note that this driver often won't achieve even 1 Mbit/sec speeds, + making it unusually slow for SPI. If your platform can inline + GPIO operations, you should be able to leverage that for better + speed with a custom version of this driver; see the source code. + +config SPI_IMG_SPFI + tristate "IMG SPFI controller" + depends on MIPS || COMPILE_TEST + help + This enables support for the SPFI master controller found on + IMG SoCs. + +config SPI_IMX + tristate "Freescale i.MX SPI controllers" + depends on ARCH_MXC || COMPILE_TEST + select SPI_BITBANG + help + This enables support for the Freescale i.MX SPI controllers. + +config SPI_JCORE + tristate "J-Core SPI Master" + depends on OF && (SUPERH || COMPILE_TEST) + help + This enables support for the SPI master controller in the J-Core + synthesizable, open source SoC. + +config SPI_LM70_LLP + tristate "Parallel port adapter for LM70 eval board (DEVELOPMENT)" + depends on PARPORT + select SPI_BITBANG + help + This driver supports the NS LM70 LLP Evaluation Board, + which interfaces to an LM70 temperature sensor using + a parallel port. + +config SPI_LP8841_RTC + tristate "ICP DAS LP-8841 SPI Controller for RTC" + depends on MACH_PXA27X_DT || COMPILE_TEST + help + This driver provides an SPI master device to drive Maxim + DS-1302 real time clock. + + Say N here unless you plan to run the kernel on an ICP DAS + LP-8x4x industrial computer. + +config SPI_MPC52xx + tristate "Freescale MPC52xx SPI (non-PSC) controller support" + depends on PPC_MPC52xx + help + This drivers supports the MPC52xx SPI controller in master SPI + mode. + +config SPI_MPC52xx_PSC + tristate "Freescale MPC52xx PSC SPI controller" + depends on PPC_MPC52xx + help + This enables using the Freescale MPC52xx Programmable Serial + Controller in master SPI mode. + +config SPI_MPC512x_PSC + tristate "Freescale MPC512x PSC SPI controller" + depends on PPC_MPC512x + help + This enables using the Freescale MPC5121 Programmable Serial + Controller in SPI master mode. + +config SPI_FSL_LIB + tristate + depends on OF + +config SPI_FSL_CPM + tristate + depends on FSL_SOC + +config SPI_FSL_SPI + tristate "Freescale SPI controller and Aeroflex Gaisler GRLIB SPI controller" + depends on OF + select SPI_FSL_LIB + select SPI_FSL_CPM if FSL_SOC + help + This enables using the Freescale SPI controllers in master mode. + MPC83xx platform uses the controller in cpu mode or CPM/QE mode. + MPC8569 uses the controller in QE mode, MPC8610 in cpu mode. + This also enables using the Aeroflex Gaisler GRLIB SPI controller in + master mode. + +config SPI_FSL_DSPI + tristate "Freescale DSPI controller" + select REGMAP_MMIO + depends on SOC_VF610 || SOC_LS1021A || ARCH_LAYERSCAPE || M5441x || COMPILE_TEST + help + This enables support for the Freescale DSPI controller in master + mode. VF610, LS1021A and ColdFire platforms uses the controller. + +config SPI_FSL_ESPI + tristate "Freescale eSPI controller" + depends on FSL_SOC + help + This enables using the Freescale eSPI controllers in master mode. + From MPC8536, 85xx platform uses the controller, and all P10xx, + P20xx, P30xx,P40xx, P50xx uses this controller. + +config SPI_MESON_SPICC + tristate "Amlogic Meson SPICC controller" + depends on COMMON_CLK + depends on ARCH_MESON || COMPILE_TEST + help + This enables master mode support for the SPICC (SPI communication + controller) available in Amlogic Meson SoCs. + +config SPI_MESON_SPIFC + tristate "Amlogic Meson SPIFC controller" + depends on ARCH_MESON || COMPILE_TEST + select REGMAP_MMIO + help + This enables master mode support for the SPIFC (SPI flash + controller) available in Amlogic Meson SoCs. + +config SPI_MT65XX + tristate "MediaTek SPI controller" + depends on ARCH_MEDIATEK || COMPILE_TEST + help + This selects the MediaTek(R) SPI bus driver. + If you want to use MediaTek(R) SPI interface, + say Y or M here.If you are not sure, say N. + SPI drivers for Mediatek MT65XX and MT81XX series ARM SoCs. + +config SPI_MT7621 + tristate "MediaTek MT7621 SPI Controller" + depends on RALINK || COMPILE_TEST + help + This selects a driver for the MediaTek MT7621 SPI Controller. + +config SPI_MTK_NOR + tristate "MediaTek SPI NOR controller" + depends on ARCH_MEDIATEK || COMPILE_TEST + help + This enables support for SPI NOR controller found on MediaTek + ARM SoCs. This is a controller specifically for SPI NOR flash. + It can perform generic SPI transfers up to 6 bytes via generic + SPI interface as well as several SPI NOR specific instructions + via SPI MEM interface. + +config SPI_NPCM_FIU + tristate "Nuvoton NPCM FLASH Interface Unit" + depends on ARCH_NPCM || COMPILE_TEST + depends on OF && HAS_IOMEM + help + This enables support for the Flash Interface Unit SPI controller + in master mode. + This driver does not support generic SPI. The implementation only + supports spi-mem interface. + +config SPI_NPCM_PSPI + tristate "Nuvoton NPCM PSPI Controller" + depends on ARCH_NPCM || COMPILE_TEST + help + This driver provides support for Nuvoton NPCM BMC + Peripheral SPI controller in master mode. + +config SPI_LANTIQ_SSC + tristate "Lantiq SSC SPI controller" + depends on LANTIQ || X86 || COMPILE_TEST + help + This driver supports the Lantiq SSC SPI controller in master + mode. This controller is found on Intel (former Lantiq) SoCs like + the Danube, Falcon, xRX200, xRX300, Lightning Mountain. + +config SPI_OC_TINY + tristate "OpenCores tiny SPI" + depends on GPIOLIB || COMPILE_TEST + select SPI_BITBANG + help + This is the driver for OpenCores tiny SPI master controller. + +config SPI_OCTEON + tristate "Cavium OCTEON SPI controller" + depends on CAVIUM_OCTEON_SOC + help + SPI host driver for the hardware found on some Cavium OCTEON + SOCs. + +config SPI_OMAP_UWIRE + tristate "OMAP1 MicroWire" + depends on ARCH_OMAP1 + select SPI_BITBANG + help + This hooks up to the MicroWire controller on OMAP1 chips. + +config SPI_OMAP24XX + tristate "McSPI driver for OMAP" + depends on ARCH_OMAP2PLUS || ARCH_K3 || COMPILE_TEST + select SG_SPLIT + help + SPI master controller for OMAP24XX and later Multichannel SPI + (McSPI) modules. + +config SPI_TI_QSPI + tristate "DRA7xxx QSPI controller support" + depends on ARCH_OMAP2PLUS || COMPILE_TEST + help + QSPI master controller for DRA7xxx used for flash devices. + This device supports single, dual and quad read support, while + it only supports single write mode. + +config SPI_OMAP_100K + tristate "OMAP SPI 100K" + depends on ARCH_OMAP850 || ARCH_OMAP730 || COMPILE_TEST + help + OMAP SPI 100K master controller for omap7xx boards. + +config SPI_ORION + tristate "Orion SPI master" + depends on PLAT_ORION || ARCH_MVEBU || COMPILE_TEST + help + This enables using the SPI master controller on the Orion + and MVEBU chips. + +config SPI_PIC32 + tristate "Microchip PIC32 series SPI" + depends on MACH_PIC32 || COMPILE_TEST + help + SPI driver for Microchip PIC32 SPI master controller. + +config SPI_PIC32_SQI + tristate "Microchip PIC32 Quad SPI driver" + depends on MACH_PIC32 || COMPILE_TEST + help + SPI driver for PIC32 Quad SPI controller. + +config SPI_PL022 + tristate "ARM AMBA PL022 SSP controller" + depends on ARM_AMBA + default y if MACH_U300 + default y if ARCH_REALVIEW + default y if INTEGRATOR_IMPD1 + default y if ARCH_VERSATILE + help + This selects the ARM(R) AMBA(R) PrimeCell PL022 SSP + controller. If you have an embedded system with an AMBA(R) + bus and a PL022 controller, say Y or M here. + +config SPI_PPC4xx + tristate "PPC4xx SPI Controller" + depends on PPC32 && 4xx + select SPI_BITBANG + help + This selects a driver for the PPC4xx SPI Controller. + +config SPI_PXA2XX + tristate "PXA2xx SSP SPI master" + depends on ARCH_PXA || ARCH_MMP || PCI || ACPI || COMPILE_TEST + select PXA_SSP if ARCH_PXA || ARCH_MMP + help + This enables using a PXA2xx or Sodaville SSP port as a SPI master + controller. The driver can be configured to use any SSP port and + additional documentation can be found a Documentation/spi/pxa2xx.rst. + +config SPI_PXA2XX_PCI + def_tristate SPI_PXA2XX && PCI && COMMON_CLK + +config SPI_ROCKCHIP + tristate "Rockchip SPI controller driver" + help + This selects a driver for Rockchip SPI controller. + + If you say yes to this option, support will be included for + RK3066, RK3188 and RK3288 families of SPI controller. + Rockchip SPI controller support DMA transport and PIO mode. + The main usecase of this controller is to use spi flash as boot + device. + +config SPI_RB4XX + tristate "Mikrotik RB4XX SPI master" + depends on SPI_MASTER && ATH79 + help + SPI controller driver for the Mikrotik RB4xx series boards. + +config SPI_RPCIF + tristate "Renesas RPC-IF SPI driver" + depends on RENESAS_RPCIF + help + SPI driver for Renesas R-Car Gen3 RPC-IF. + +config SPI_RSPI + tristate "Renesas RSPI/QSPI controller" + depends on SUPERH || ARCH_RENESAS || COMPILE_TEST + help + SPI driver for Renesas RSPI and QSPI blocks. + +config SPI_QCOM_QSPI + tristate "QTI QSPI controller" + depends on ARCH_QCOM + help + QSPI(Quad SPI) driver for Qualcomm QSPI controller. + +config SPI_QUP + tristate "Qualcomm SPI controller with QUP interface" + depends on ARCH_QCOM || COMPILE_TEST + help + Qualcomm Universal Peripheral (QUP) core is an AHB slave that + provides a common data path (an output FIFO and an input FIFO) + for serial peripheral interface (SPI) mini-core. SPI in master + mode supports up to 50MHz, up to four chip selects, programmable + data path from 4 bits to 32 bits and numerous protocol variants. + + This driver can also be built as a module. If so, the module + will be called spi_qup. + +config SPI_QCOM_GENI + tristate "Qualcomm GENI based SPI controller" + depends on QCOM_GENI_SE + help + This driver supports GENI serial engine based SPI controller in + master mode on the Qualcomm Technologies Inc.'s SoCs. If you say + yes to this option, support will be included for the built-in SPI + interface on the Qualcomm Technologies Inc.'s SoCs. + + This driver can also be built as a module. If so, the module + will be called spi-geni-qcom. + +config SPI_S3C24XX + tristate "Samsung S3C24XX series SPI" + depends on ARCH_S3C24XX + select SPI_BITBANG + help + SPI driver for Samsung S3C24XX series ARM SoCs + +config SPI_S3C24XX_FIQ + bool "S3C24XX driver with FIQ pseudo-DMA" + depends on SPI_S3C24XX + select FIQ + help + Enable FIQ support for the S3C24XX SPI driver to provide pseudo + DMA by using the fast-interrupt request framework, This allows + the driver to get DMA-like performance when there are either + no free DMA channels, or when doing transfers that required both + TX and RX data paths. + +config SPI_S3C64XX + tristate "Samsung S3C64XX series type SPI" + depends on (PLAT_SAMSUNG || ARCH_S5PV210 || ARCH_EXYNOS || COMPILE_TEST) + help + SPI driver for Samsung S3C64XX and newer SoCs. + +config SPI_SC18IS602 + tristate "NXP SC18IS602/602B/603 I2C to SPI bridge" + depends on I2C + help + SPI driver for NXP SC18IS602/602B/603 I2C to SPI bridge. + +config SPI_SH_MSIOF + tristate "SuperH MSIOF SPI controller" + depends on HAVE_CLK + depends on ARCH_SHMOBILE || ARCH_RENESAS || COMPILE_TEST + help + SPI driver for SuperH and SH Mobile MSIOF blocks. + +config SPI_SH + tristate "SuperH SPI controller" + depends on SUPERH || COMPILE_TEST + help + SPI driver for SuperH SPI blocks. + +config SPI_SH_SCI + tristate "SuperH SCI SPI controller" + depends on SUPERH + select SPI_BITBANG + help + SPI driver for SuperH SCI blocks. + +config SPI_SH_HSPI + tristate "SuperH HSPI controller" + depends on ARCH_RENESAS || COMPILE_TEST + help + SPI driver for SuperH HSPI blocks. + +config SPI_SIFIVE + tristate "SiFive SPI controller" + depends on HAS_IOMEM + help + This exposes the SPI controller IP from SiFive. + +config SPI_SIRF + tristate "CSR SiRFprimaII SPI controller" + depends on SIRF_DMA + select SPI_BITBANG + help + SPI driver for CSR SiRFprimaII SoCs + +config SPI_SLAVE_MT27XX + tristate "MediaTek SPI slave device" + depends on ARCH_MEDIATEK || COMPILE_TEST + depends on SPI_SLAVE + help + This selects the MediaTek(R) SPI slave device driver. + If you want to use MediaTek(R) SPI slave interface, + say Y or M here.If you are not sure, say N. + SPI slave drivers for Mediatek MT27XX series ARM SoCs. + +config SPI_SPRD + tristate "Spreadtrum SPI controller" + depends on ARCH_SPRD || COMPILE_TEST + help + SPI driver for Spreadtrum SoCs. + +config SPI_SPRD_ADI + tristate "Spreadtrum ADI controller" + depends on ARCH_SPRD || COMPILE_TEST + depends on HWSPINLOCK || (COMPILE_TEST && !HWSPINLOCK) + help + ADI driver based on SPI for Spreadtrum SoCs. + +config SPI_STM32 + tristate "STMicroelectronics STM32 SPI controller" + depends on ARCH_STM32 || COMPILE_TEST + help + SPI driver for STMicroelectronics STM32 SoCs. + + STM32 SPI controller supports DMA and PIO modes. When DMA + is not available, the driver automatically falls back to + PIO mode. + +config SPI_STM32_QSPI + tristate "STMicroelectronics STM32 QUAD SPI controller" + depends on ARCH_STM32 || COMPILE_TEST + depends on OF + help + This enables support for the Quad SPI controller in master mode. + This driver does not support generic SPI. The implementation only + supports spi-mem interface. + +config SPI_ST_SSC4 + tristate "STMicroelectronics SPI SSC-based driver" + depends on ARCH_STI || COMPILE_TEST + help + STMicroelectronics SoCs support for SPI. If you say yes to + this option, support will be included for the SSC driven SPI. + +config SPI_SUN4I + tristate "Allwinner A10 SoCs SPI controller" + depends on ARCH_SUNXI || COMPILE_TEST + help + SPI driver for Allwinner sun4i, sun5i and sun7i SoCs + +config SPI_SUN6I + tristate "Allwinner A31 SPI controller" + depends on ARCH_SUNXI || COMPILE_TEST + depends on RESET_CONTROLLER + help + This enables using the SPI controller on the Allwinner A31 SoCs. + +config SPI_SYNQUACER + tristate "Socionext's SynQuacer HighSpeed SPI controller" + depends on ARCH_SYNQUACER || COMPILE_TEST + help + SPI driver for Socionext's High speed SPI controller which provides + various operating modes for interfacing to serial peripheral devices + that use the de-facto standard SPI protocol. + + It also supports the new dual-bit and quad-bit SPI protocol. + +config SPI_MXIC + tristate "Macronix MX25F0A SPI controller" + depends on SPI_MASTER + help + This selects the Macronix MX25F0A SPI controller driver. + +config SPI_MXS + tristate "Freescale MXS SPI controller" + depends on ARCH_MXS + select STMP_DEVICE + help + SPI driver for Freescale MXS devices. + +config SPI_TEGRA114 + tristate "NVIDIA Tegra114 SPI Controller" + depends on (ARCH_TEGRA && TEGRA20_APB_DMA) || COMPILE_TEST + depends on RESET_CONTROLLER + help + SPI driver for NVIDIA Tegra114 SPI Controller interface. This controller + is different than the older SoCs SPI controller and also register interface + get changed with this controller. + +config SPI_TEGRA20_SFLASH + tristate "Nvidia Tegra20 Serial flash Controller" + depends on ARCH_TEGRA || COMPILE_TEST + depends on RESET_CONTROLLER + help + SPI driver for Nvidia Tegra20 Serial flash Controller interface. + The main usecase of this controller is to use spi flash as boot + device. + +config SPI_TEGRA20_SLINK + tristate "Nvidia Tegra20/Tegra30 SLINK Controller" + depends on (ARCH_TEGRA && TEGRA20_APB_DMA) || COMPILE_TEST + depends on RESET_CONTROLLER + help + SPI driver for Nvidia Tegra20/Tegra30 SLINK Controller interface. + +config SPI_THUNDERX + tristate "Cavium ThunderX SPI controller" + depends on PCI && 64BIT && (ARM64 || COMPILE_TEST) + help + SPI host driver for the hardware found on Cavium ThunderX + SOCs. + +config SPI_TOPCLIFF_PCH + tristate "Intel EG20T PCH/LAPIS Semicon IOH(ML7213/ML7223/ML7831) SPI" + depends on PCI && (X86_32 || MIPS || COMPILE_TEST) + help + SPI driver for the Topcliff PCH (Platform Controller Hub) SPI bus + used in some x86 embedded processors. + + This driver also supports the ML7213/ML7223/ML7831, a companion chip + for the Atom E6xx series and compatible with the Intel EG20T PCH. + +config SPI_TXX9 + tristate "Toshiba TXx9 SPI controller" + depends on GPIOLIB && (CPU_TX49XX || COMPILE_TEST) + help + SPI driver for Toshiba TXx9 MIPS SoCs + +config SPI_UNIPHIER + tristate "Socionext UniPhier SPI Controller" + depends on (ARCH_UNIPHIER || COMPILE_TEST) && OF + depends on HAS_IOMEM + help + This enables a driver for the Socionext UniPhier SoC SCSSI SPI controller. + + UniPhier SoCs have SCSSI and MCSSI SPI controllers. + Every UniPhier SoC has SCSSI which supports single channel. + Older UniPhier Pro4/Pro5 also has MCSSI which support multiple channels. + This driver supports SCSSI only. + + If your SoC supports SCSSI, say Y here. + +config SPI_XCOMM + tristate "Analog Devices AD-FMCOMMS1-EBZ SPI-I2C-bridge driver" + depends on I2C + help + Support for the SPI-I2C bridge found on the Analog Devices + AD-FMCOMMS1-EBZ board. + +config SPI_XILINX + tristate "Xilinx SPI controller common module" + depends on HAS_IOMEM + select SPI_BITBANG + help + This exposes the SPI controller IP from the Xilinx EDK. + + See the "OPB Serial Peripheral Interface (SPI) (v1.00e)" + Product Specification document (DS464) for hardware details. + + Or for the DS570, see "XPS Serial Peripheral Interface (SPI) (v2.00b)" + +config SPI_XLP + tristate "Netlogic XLP SPI controller driver" + depends on CPU_XLP || ARCH_THUNDER2 || COMPILE_TEST + help + Enable support for the SPI controller on the Netlogic XLP SoCs. + Currently supported XLP variants are XLP8XX, XLP3XX, XLP2XX, XLP9XX + and XLP5XX. + + If you have a Netlogic XLP platform say Y here. + If unsure, say N. + +config SPI_XTENSA_XTFPGA + tristate "Xtensa SPI controller for xtfpga" + depends on (XTENSA && XTENSA_PLATFORM_XTFPGA) || COMPILE_TEST + select SPI_BITBANG + help + SPI driver for xtfpga SPI master controller. + + This simple SPI master controller is built into xtfpga bitstreams + and is used to control daughterboard audio codec. It always transfers + 16 bit words in SPI mode 0, automatically asserting CS on transfer + start and deasserting on end. + +config SPI_ZYNQ_QSPI + tristate "Xilinx Zynq QSPI controller" + depends on ARCH_ZYNQ || COMPILE_TEST + depends on SPI_MEM + help + This enables support for the Zynq Quad SPI controller + in master mode. + This controller only supports SPI memory interface. + +config SPI_ZYNQMP_GQSPI + tristate "Xilinx ZynqMP GQSPI controller" + depends on (SPI_MEM && HAS_DMA) || COMPILE_TEST + help + Enables Xilinx GQSPI controller driver for Zynq UltraScale+ MPSoC. + This controller only supports SPI memory interface. + +config SPI_AMD + tristate "AMD SPI controller" + depends on SPI_MASTER || COMPILE_TEST + help + Enables SPI controller driver for AMD SoC. + +# +# Add new SPI master controllers in alphabetical order above this line +# + +comment "SPI Multiplexer support" + +config SPI_MUX + tristate "SPI multiplexer support" + select MULTIPLEXER + help + This adds support for SPI multiplexers. Each SPI mux will be + accessible as a SPI controller, the devices behind the mux will appear + to be chip selects on this controller. It is still necessary to + select one or more specific mux-controller drivers. + +# +# There are lots of SPI device types, with sensors and memory +# being probably the most widely used ones. +# +comment "SPI Protocol Masters" + +config SPI_SPIDEV + tristate "User mode SPI device driver support" + help + This supports user mode SPI protocol drivers. + + Note that this application programming interface is EXPERIMENTAL + and hence SUBJECT TO CHANGE WITHOUT NOTICE while it stabilizes. + +config SPI_LOOPBACK_TEST + tristate "spi loopback test framework support" + depends on m + help + This enables the SPI loopback testing framework driver + + primarily used for development of spi_master drivers + and to detect regressions + +config SPI_TLE62X0 + tristate "Infineon TLE62X0 (for power switching)" + depends on SYSFS + help + SPI driver for Infineon TLE62X0 series line driver chips, + such as the TLE6220, TLE6230 and TLE6240. This provides a + sysfs interface, with each line presented as a kind of GPIO + exposing both switch control and diagnostic feedback. + +# +# Add new SPI protocol masters in alphabetical order above this line +# + +endif # SPI_MASTER + +# +# SLAVE side ... listening to other SPI masters +# + +config SPI_SLAVE + bool "SPI slave protocol handlers" + help + If your system has a slave-capable SPI controller, you can enable + slave protocol handlers. + +if SPI_SLAVE + +config SPI_SLAVE_TIME + tristate "SPI slave handler reporting boot up time" + help + SPI slave handler responding with the time of reception of the last + SPI message. + +config SPI_SLAVE_SYSTEM_CONTROL + tristate "SPI slave handler controlling system state" + help + SPI slave handler to allow remote control of system reboot, power + off, halt, and suspend. + +endif # SPI_SLAVE + +config SPI_DYNAMIC + def_bool ACPI || OF_DYNAMIC || SPI_SLAVE + +endif # SPI diff --git a/drivers/spi/Makefile b/drivers/spi/Makefile new file mode 100644 index 000000000..6fea58216 --- /dev/null +++ b/drivers/spi/Makefile @@ -0,0 +1,137 @@ +# SPDX-License-Identifier: GPL-2.0 +# +# Makefile for kernel SPI drivers. +# + +ccflags-$(CONFIG_SPI_DEBUG) := -DDEBUG + +# small core, mostly translating board-specific +# config declarations into driver model code +obj-$(CONFIG_SPI_MASTER) += spi.o +obj-$(CONFIG_SPI_MEM) += spi-mem.o +obj-$(CONFIG_SPI_MUX) += spi-mux.o +obj-$(CONFIG_SPI_SPIDEV) += spidev.o +obj-$(CONFIG_SPI_LOOPBACK_TEST) += spi-loopback-test.o + +# SPI master controller drivers (bus) +obj-$(CONFIG_SPI_ALTERA) += spi-altera.o +obj-$(CONFIG_SPI_AR934X) += spi-ar934x.o +obj-$(CONFIG_SPI_ARMADA_3700) += spi-armada-3700.o +obj-$(CONFIG_SPI_ATMEL) += spi-atmel.o +obj-$(CONFIG_SPI_ATMEL_QUADSPI) += atmel-quadspi.o +obj-$(CONFIG_SPI_AT91_USART) += spi-at91-usart.o +obj-$(CONFIG_SPI_ATH79) += spi-ath79.o +obj-$(CONFIG_SPI_AU1550) += spi-au1550.o +obj-$(CONFIG_SPI_AXI_SPI_ENGINE) += spi-axi-spi-engine.o +obj-$(CONFIG_SPI_BCM2835) += spi-bcm2835.o +obj-$(CONFIG_SPI_BCM2835AUX) += spi-bcm2835aux.o +obj-$(CONFIG_SPI_BCM63XX) += spi-bcm63xx.o +obj-$(CONFIG_SPI_BCM63XX_HSSPI) += spi-bcm63xx-hsspi.o +obj-$(CONFIG_SPI_BCM_QSPI) += spi-iproc-qspi.o spi-brcmstb-qspi.o spi-bcm-qspi.o +obj-$(CONFIG_SPI_BITBANG) += spi-bitbang.o +obj-$(CONFIG_SPI_BUTTERFLY) += spi-butterfly.o +obj-$(CONFIG_SPI_CADENCE) += spi-cadence.o +obj-$(CONFIG_SPI_CADENCE_QUADSPI) += spi-cadence-quadspi.o +obj-$(CONFIG_SPI_CLPS711X) += spi-clps711x.o +obj-$(CONFIG_SPI_COLDFIRE_QSPI) += spi-coldfire-qspi.o +obj-$(CONFIG_SPI_DAVINCI) += spi-davinci.o +obj-$(CONFIG_SPI_DLN2) += spi-dln2.o +obj-$(CONFIG_SPI_DESIGNWARE) += spi-dw.o +spi-dw-y := spi-dw-core.o +spi-dw-$(CONFIG_SPI_DW_DMA) += spi-dw-dma.o +obj-$(CONFIG_SPI_DW_BT1) += spi-dw-bt1.o +obj-$(CONFIG_SPI_DW_MMIO) += spi-dw-mmio.o +obj-$(CONFIG_SPI_DW_PCI) += spi-dw-pci.o +obj-$(CONFIG_SPI_EFM32) += spi-efm32.o +obj-$(CONFIG_SPI_EP93XX) += spi-ep93xx.o +obj-$(CONFIG_SPI_FALCON) += spi-falcon.o +obj-$(CONFIG_SPI_FSI) += spi-fsi.o +obj-$(CONFIG_SPI_FSL_CPM) += spi-fsl-cpm.o +obj-$(CONFIG_SPI_FSL_DSPI) += spi-fsl-dspi.o +obj-$(CONFIG_SPI_FSL_LIB) += spi-fsl-lib.o +obj-$(CONFIG_SPI_FSL_ESPI) += spi-fsl-espi.o +obj-$(CONFIG_SPI_FSL_LPSPI) += spi-fsl-lpspi.o +obj-$(CONFIG_SPI_FSL_QUADSPI) += spi-fsl-qspi.o +obj-$(CONFIG_SPI_FSL_SPI) += spi-fsl-spi.o +obj-$(CONFIG_SPI_GPIO) += spi-gpio.o +obj-$(CONFIG_SPI_HISI_SFC_V3XX) += spi-hisi-sfc-v3xx.o +obj-$(CONFIG_SPI_IMG_SPFI) += spi-img-spfi.o +obj-$(CONFIG_SPI_IMX) += spi-imx.o +obj-$(CONFIG_SPI_LANTIQ_SSC) += spi-lantiq-ssc.o +obj-$(CONFIG_SPI_JCORE) += spi-jcore.o +obj-$(CONFIG_SPI_LM70_LLP) += spi-lm70llp.o +obj-$(CONFIG_SPI_LP8841_RTC) += spi-lp8841-rtc.o +obj-$(CONFIG_SPI_MESON_SPICC) += spi-meson-spicc.o +obj-$(CONFIG_SPI_MESON_SPIFC) += spi-meson-spifc.o +obj-$(CONFIG_SPI_MPC512x_PSC) += spi-mpc512x-psc.o +obj-$(CONFIG_SPI_MPC52xx_PSC) += spi-mpc52xx-psc.o +obj-$(CONFIG_SPI_MPC52xx) += spi-mpc52xx.o +obj-$(CONFIG_SPI_MT65XX) += spi-mt65xx.o +obj-$(CONFIG_SPI_MT7621) += spi-mt7621.o +obj-$(CONFIG_SPI_MTK_NOR) += spi-mtk-nor.o +obj-$(CONFIG_SPI_MXIC) += spi-mxic.o +obj-$(CONFIG_SPI_MXS) += spi-mxs.o +obj-$(CONFIG_SPI_NPCM_FIU) += spi-npcm-fiu.o +obj-$(CONFIG_SPI_NPCM_PSPI) += spi-npcm-pspi.o +obj-$(CONFIG_SPI_NXP_FLEXSPI) += spi-nxp-fspi.o +obj-$(CONFIG_SPI_OC_TINY) += spi-oc-tiny.o +spi-octeon-objs := spi-cavium.o spi-cavium-octeon.o +obj-$(CONFIG_SPI_OCTEON) += spi-octeon.o +obj-$(CONFIG_SPI_OMAP_UWIRE) += spi-omap-uwire.o +obj-$(CONFIG_SPI_OMAP_100K) += spi-omap-100k.o +obj-$(CONFIG_SPI_OMAP24XX) += spi-omap2-mcspi.o +obj-$(CONFIG_SPI_TI_QSPI) += spi-ti-qspi.o +obj-$(CONFIG_SPI_ORION) += spi-orion.o +obj-$(CONFIG_SPI_PIC32) += spi-pic32.o +obj-$(CONFIG_SPI_PIC32_SQI) += spi-pic32-sqi.o +obj-$(CONFIG_SPI_PL022) += spi-pl022.o +obj-$(CONFIG_SPI_PPC4xx) += spi-ppc4xx.o +spi-pxa2xx-platform-objs := spi-pxa2xx.o spi-pxa2xx-dma.o +obj-$(CONFIG_SPI_PXA2XX) += spi-pxa2xx-platform.o +obj-$(CONFIG_SPI_PXA2XX_PCI) += spi-pxa2xx-pci.o +obj-$(CONFIG_SPI_QCOM_GENI) += spi-geni-qcom.o +obj-$(CONFIG_SPI_QCOM_QSPI) += spi-qcom-qspi.o +obj-$(CONFIG_SPI_QUP) += spi-qup.o +obj-$(CONFIG_SPI_ROCKCHIP) += spi-rockchip.o +obj-$(CONFIG_SPI_RB4XX) += spi-rb4xx.o +obj-$(CONFIG_SPI_RPCIF) += spi-rpc-if.o +obj-$(CONFIG_SPI_RSPI) += spi-rspi.o +obj-$(CONFIG_SPI_S3C24XX) += spi-s3c24xx-hw.o +spi-s3c24xx-hw-y := spi-s3c24xx.o +obj-$(CONFIG_SPI_S3C64XX) += spi-s3c64xx.o +obj-$(CONFIG_SPI_SC18IS602) += spi-sc18is602.o +obj-$(CONFIG_SPI_SH) += spi-sh.o +obj-$(CONFIG_SPI_SH_HSPI) += spi-sh-hspi.o +obj-$(CONFIG_SPI_SH_MSIOF) += spi-sh-msiof.o +obj-$(CONFIG_SPI_SH_SCI) += spi-sh-sci.o +obj-$(CONFIG_SPI_SIFIVE) += spi-sifive.o +obj-$(CONFIG_SPI_SIRF) += spi-sirf.o +obj-$(CONFIG_SPI_SLAVE_MT27XX) += spi-slave-mt27xx.o +obj-$(CONFIG_SPI_SPRD) += spi-sprd.o +obj-$(CONFIG_SPI_SPRD_ADI) += spi-sprd-adi.o +obj-$(CONFIG_SPI_STM32) += spi-stm32.o +obj-$(CONFIG_SPI_STM32_QSPI) += spi-stm32-qspi.o +obj-$(CONFIG_SPI_ST_SSC4) += spi-st-ssc4.o +obj-$(CONFIG_SPI_SUN4I) += spi-sun4i.o +obj-$(CONFIG_SPI_SUN6I) += spi-sun6i.o +obj-$(CONFIG_SPI_SYNQUACER) += spi-synquacer.o +obj-$(CONFIG_SPI_TEGRA114) += spi-tegra114.o +obj-$(CONFIG_SPI_TEGRA20_SFLASH) += spi-tegra20-sflash.o +obj-$(CONFIG_SPI_TEGRA20_SLINK) += spi-tegra20-slink.o +obj-$(CONFIG_SPI_TLE62X0) += spi-tle62x0.o +spi-thunderx-objs := spi-cavium.o spi-cavium-thunderx.o +obj-$(CONFIG_SPI_THUNDERX) += spi-thunderx.o +obj-$(CONFIG_SPI_TOPCLIFF_PCH) += spi-topcliff-pch.o +obj-$(CONFIG_SPI_TXX9) += spi-txx9.o +obj-$(CONFIG_SPI_UNIPHIER) += spi-uniphier.o +obj-$(CONFIG_SPI_XCOMM) += spi-xcomm.o +obj-$(CONFIG_SPI_XILINX) += spi-xilinx.o +obj-$(CONFIG_SPI_XLP) += spi-xlp.o +obj-$(CONFIG_SPI_XTENSA_XTFPGA) += spi-xtensa-xtfpga.o +obj-$(CONFIG_SPI_ZYNQ_QSPI) += spi-zynq-qspi.o +obj-$(CONFIG_SPI_ZYNQMP_GQSPI) += spi-zynqmp-gqspi.o +obj-$(CONFIG_SPI_AMD) += spi-amd.o + +# SPI slave protocol handlers +obj-$(CONFIG_SPI_SLAVE_TIME) += spi-slave-time.o +obj-$(CONFIG_SPI_SLAVE_SYSTEM_CONTROL) += spi-slave-system-control.o diff --git a/drivers/spi/atmel-quadspi.c b/drivers/spi/atmel-quadspi.c new file mode 100644 index 000000000..8aa89d93d --- /dev/null +++ b/drivers/spi/atmel-quadspi.c @@ -0,0 +1,725 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Driver for Atmel QSPI Controller + * + * Copyright (C) 2015 Atmel Corporation + * Copyright (C) 2018 Cryptera A/S + * + * Author: Cyrille Pitchen <cyrille.pitchen@atmel.com> + * Author: Piotr Bugalski <bugalski.piotr@gmail.com> + * + * This driver is based on drivers/mtd/spi-nor/fsl-quadspi.c from Freescale. + */ + +#include <linux/clk.h> +#include <linux/delay.h> +#include <linux/err.h> +#include <linux/interrupt.h> +#include <linux/io.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/of.h> +#include <linux/of_platform.h> +#include <linux/platform_device.h> +#include <linux/spi/spi-mem.h> + +/* QSPI register offsets */ +#define QSPI_CR 0x0000 /* Control Register */ +#define QSPI_MR 0x0004 /* Mode Register */ +#define QSPI_RD 0x0008 /* Receive Data Register */ +#define QSPI_TD 0x000c /* Transmit Data Register */ +#define QSPI_SR 0x0010 /* Status Register */ +#define QSPI_IER 0x0014 /* Interrupt Enable Register */ +#define QSPI_IDR 0x0018 /* Interrupt Disable Register */ +#define QSPI_IMR 0x001c /* Interrupt Mask Register */ +#define QSPI_SCR 0x0020 /* Serial Clock Register */ + +#define QSPI_IAR 0x0030 /* Instruction Address Register */ +#define QSPI_ICR 0x0034 /* Instruction Code Register */ +#define QSPI_WICR 0x0034 /* Write Instruction Code Register */ +#define QSPI_IFR 0x0038 /* Instruction Frame Register */ +#define QSPI_RICR 0x003C /* Read Instruction Code Register */ + +#define QSPI_SMR 0x0040 /* Scrambling Mode Register */ +#define QSPI_SKR 0x0044 /* Scrambling Key Register */ + +#define QSPI_WPMR 0x00E4 /* Write Protection Mode Register */ +#define QSPI_WPSR 0x00E8 /* Write Protection Status Register */ + +#define QSPI_VERSION 0x00FC /* Version Register */ + + +/* Bitfields in QSPI_CR (Control Register) */ +#define QSPI_CR_QSPIEN BIT(0) +#define QSPI_CR_QSPIDIS BIT(1) +#define QSPI_CR_SWRST BIT(7) +#define QSPI_CR_LASTXFER BIT(24) + +/* Bitfields in QSPI_MR (Mode Register) */ +#define QSPI_MR_SMM BIT(0) +#define QSPI_MR_LLB BIT(1) +#define QSPI_MR_WDRBT BIT(2) +#define QSPI_MR_SMRM BIT(3) +#define QSPI_MR_CSMODE_MASK GENMASK(5, 4) +#define QSPI_MR_CSMODE_NOT_RELOADED (0 << 4) +#define QSPI_MR_CSMODE_LASTXFER (1 << 4) +#define QSPI_MR_CSMODE_SYSTEMATICALLY (2 << 4) +#define QSPI_MR_NBBITS_MASK GENMASK(11, 8) +#define QSPI_MR_NBBITS(n) ((((n) - 8) << 8) & QSPI_MR_NBBITS_MASK) +#define QSPI_MR_DLYBCT_MASK GENMASK(23, 16) +#define QSPI_MR_DLYBCT(n) (((n) << 16) & QSPI_MR_DLYBCT_MASK) +#define QSPI_MR_DLYCS_MASK GENMASK(31, 24) +#define QSPI_MR_DLYCS(n) (((n) << 24) & QSPI_MR_DLYCS_MASK) + +/* Bitfields in QSPI_SR/QSPI_IER/QSPI_IDR/QSPI_IMR */ +#define QSPI_SR_RDRF BIT(0) +#define QSPI_SR_TDRE BIT(1) +#define QSPI_SR_TXEMPTY BIT(2) +#define QSPI_SR_OVRES BIT(3) +#define QSPI_SR_CSR BIT(8) +#define QSPI_SR_CSS BIT(9) +#define QSPI_SR_INSTRE BIT(10) +#define QSPI_SR_QSPIENS BIT(24) + +#define QSPI_SR_CMD_COMPLETED (QSPI_SR_INSTRE | QSPI_SR_CSR) + +/* Bitfields in QSPI_SCR (Serial Clock Register) */ +#define QSPI_SCR_CPOL BIT(0) +#define QSPI_SCR_CPHA BIT(1) +#define QSPI_SCR_SCBR_MASK GENMASK(15, 8) +#define QSPI_SCR_SCBR(n) (((n) << 8) & QSPI_SCR_SCBR_MASK) +#define QSPI_SCR_DLYBS_MASK GENMASK(23, 16) +#define QSPI_SCR_DLYBS(n) (((n) << 16) & QSPI_SCR_DLYBS_MASK) + +/* Bitfields in QSPI_ICR (Read/Write Instruction Code Register) */ +#define QSPI_ICR_INST_MASK GENMASK(7, 0) +#define QSPI_ICR_INST(inst) (((inst) << 0) & QSPI_ICR_INST_MASK) +#define QSPI_ICR_OPT_MASK GENMASK(23, 16) +#define QSPI_ICR_OPT(opt) (((opt) << 16) & QSPI_ICR_OPT_MASK) + +/* Bitfields in QSPI_IFR (Instruction Frame Register) */ +#define QSPI_IFR_WIDTH_MASK GENMASK(2, 0) +#define QSPI_IFR_WIDTH_SINGLE_BIT_SPI (0 << 0) +#define QSPI_IFR_WIDTH_DUAL_OUTPUT (1 << 0) +#define QSPI_IFR_WIDTH_QUAD_OUTPUT (2 << 0) +#define QSPI_IFR_WIDTH_DUAL_IO (3 << 0) +#define QSPI_IFR_WIDTH_QUAD_IO (4 << 0) +#define QSPI_IFR_WIDTH_DUAL_CMD (5 << 0) +#define QSPI_IFR_WIDTH_QUAD_CMD (6 << 0) +#define QSPI_IFR_INSTEN BIT(4) +#define QSPI_IFR_ADDREN BIT(5) +#define QSPI_IFR_OPTEN BIT(6) +#define QSPI_IFR_DATAEN BIT(7) +#define QSPI_IFR_OPTL_MASK GENMASK(9, 8) +#define QSPI_IFR_OPTL_1BIT (0 << 8) +#define QSPI_IFR_OPTL_2BIT (1 << 8) +#define QSPI_IFR_OPTL_4BIT (2 << 8) +#define QSPI_IFR_OPTL_8BIT (3 << 8) +#define QSPI_IFR_ADDRL BIT(10) +#define QSPI_IFR_TFRTYP_MEM BIT(12) +#define QSPI_IFR_SAMA5D2_WRITE_TRSFR BIT(13) +#define QSPI_IFR_CRM BIT(14) +#define QSPI_IFR_NBDUM_MASK GENMASK(20, 16) +#define QSPI_IFR_NBDUM(n) (((n) << 16) & QSPI_IFR_NBDUM_MASK) +#define QSPI_IFR_APBTFRTYP_READ BIT(24) /* Defined in SAM9X60 */ + +/* Bitfields in QSPI_SMR (Scrambling Mode Register) */ +#define QSPI_SMR_SCREN BIT(0) +#define QSPI_SMR_RVDIS BIT(1) + +/* Bitfields in QSPI_WPMR (Write Protection Mode Register) */ +#define QSPI_WPMR_WPEN BIT(0) +#define QSPI_WPMR_WPKEY_MASK GENMASK(31, 8) +#define QSPI_WPMR_WPKEY(wpkey) (((wpkey) << 8) & QSPI_WPMR_WPKEY_MASK) + +/* Bitfields in QSPI_WPSR (Write Protection Status Register) */ +#define QSPI_WPSR_WPVS BIT(0) +#define QSPI_WPSR_WPVSRC_MASK GENMASK(15, 8) +#define QSPI_WPSR_WPVSRC(src) (((src) << 8) & QSPI_WPSR_WPVSRC) + +struct atmel_qspi_caps { + bool has_qspick; + bool has_ricr; +}; + +struct atmel_qspi { + void __iomem *regs; + void __iomem *mem; + struct clk *pclk; + struct clk *qspick; + struct platform_device *pdev; + const struct atmel_qspi_caps *caps; + resource_size_t mmap_size; + u32 pending; + u32 mr; + u32 scr; + struct completion cmd_completion; +}; + +struct atmel_qspi_mode { + u8 cmd_buswidth; + u8 addr_buswidth; + u8 data_buswidth; + u32 config; +}; + +static const struct atmel_qspi_mode atmel_qspi_modes[] = { + { 1, 1, 1, QSPI_IFR_WIDTH_SINGLE_BIT_SPI }, + { 1, 1, 2, QSPI_IFR_WIDTH_DUAL_OUTPUT }, + { 1, 1, 4, QSPI_IFR_WIDTH_QUAD_OUTPUT }, + { 1, 2, 2, QSPI_IFR_WIDTH_DUAL_IO }, + { 1, 4, 4, QSPI_IFR_WIDTH_QUAD_IO }, + { 2, 2, 2, QSPI_IFR_WIDTH_DUAL_CMD }, + { 4, 4, 4, QSPI_IFR_WIDTH_QUAD_CMD }, +}; + +#ifdef VERBOSE_DEBUG +static const char *atmel_qspi_reg_name(u32 offset, char *tmp, size_t sz) +{ + switch (offset) { + case QSPI_CR: + return "CR"; + case QSPI_MR: + return "MR"; + case QSPI_RD: + return "MR"; + case QSPI_TD: + return "TD"; + case QSPI_SR: + return "SR"; + case QSPI_IER: + return "IER"; + case QSPI_IDR: + return "IDR"; + case QSPI_IMR: + return "IMR"; + case QSPI_SCR: + return "SCR"; + case QSPI_IAR: + return "IAR"; + case QSPI_ICR: + return "ICR/WICR"; + case QSPI_IFR: + return "IFR"; + case QSPI_RICR: + return "RICR"; + case QSPI_SMR: + return "SMR"; + case QSPI_SKR: + return "SKR"; + case QSPI_WPMR: + return "WPMR"; + case QSPI_WPSR: + return "WPSR"; + case QSPI_VERSION: + return "VERSION"; + default: + snprintf(tmp, sz, "0x%02x", offset); + break; + } + + return tmp; +} +#endif /* VERBOSE_DEBUG */ + +static u32 atmel_qspi_read(struct atmel_qspi *aq, u32 offset) +{ + u32 value = readl_relaxed(aq->regs + offset); + +#ifdef VERBOSE_DEBUG + char tmp[8]; + + dev_vdbg(&aq->pdev->dev, "read 0x%08x from %s\n", value, + atmel_qspi_reg_name(offset, tmp, sizeof(tmp))); +#endif /* VERBOSE_DEBUG */ + + return value; +} + +static void atmel_qspi_write(u32 value, struct atmel_qspi *aq, u32 offset) +{ +#ifdef VERBOSE_DEBUG + char tmp[8]; + + dev_vdbg(&aq->pdev->dev, "write 0x%08x into %s\n", value, + atmel_qspi_reg_name(offset, tmp, sizeof(tmp))); +#endif /* VERBOSE_DEBUG */ + + writel_relaxed(value, aq->regs + offset); +} + +static inline bool atmel_qspi_is_compatible(const struct spi_mem_op *op, + const struct atmel_qspi_mode *mode) +{ + if (op->cmd.buswidth != mode->cmd_buswidth) + return false; + + if (op->addr.nbytes && op->addr.buswidth != mode->addr_buswidth) + return false; + + if (op->data.nbytes && op->data.buswidth != mode->data_buswidth) + return false; + + return true; +} + +static int atmel_qspi_find_mode(const struct spi_mem_op *op) +{ + u32 i; + + for (i = 0; i < ARRAY_SIZE(atmel_qspi_modes); i++) + if (atmel_qspi_is_compatible(op, &atmel_qspi_modes[i])) + return i; + + return -ENOTSUPP; +} + +static bool atmel_qspi_supports_op(struct spi_mem *mem, + const struct spi_mem_op *op) +{ + if (!spi_mem_default_supports_op(mem, op)) + return false; + + if (atmel_qspi_find_mode(op) < 0) + return false; + + /* special case not supported by hardware */ + if (op->addr.nbytes == 2 && op->cmd.buswidth != op->addr.buswidth && + op->dummy.nbytes == 0) + return false; + + /* DTR ops not supported. */ + if (op->cmd.dtr || op->addr.dtr || op->dummy.dtr || op->data.dtr) + return false; + if (op->cmd.nbytes != 1) + return false; + + return true; +} + +static int atmel_qspi_set_cfg(struct atmel_qspi *aq, + const struct spi_mem_op *op, u32 *offset) +{ + u32 iar, icr, ifr; + u32 dummy_cycles = 0; + int mode; + + iar = 0; + icr = QSPI_ICR_INST(op->cmd.opcode); + ifr = QSPI_IFR_INSTEN; + + mode = atmel_qspi_find_mode(op); + if (mode < 0) + return mode; + ifr |= atmel_qspi_modes[mode].config; + + if (op->dummy.buswidth && op->dummy.nbytes) + dummy_cycles = op->dummy.nbytes * 8 / op->dummy.buswidth; + + /* + * The controller allows 24 and 32-bit addressing while NAND-flash + * requires 16-bit long. Handling 8-bit long addresses is done using + * the option field. For the 16-bit addresses, the workaround depends + * of the number of requested dummy bits. If there are 8 or more dummy + * cycles, the address is shifted and sent with the first dummy byte. + * Otherwise opcode is disabled and the first byte of the address + * contains the command opcode (works only if the opcode and address + * use the same buswidth). The limitation is when the 16-bit address is + * used without enough dummy cycles and the opcode is using a different + * buswidth than the address. + */ + if (op->addr.buswidth) { + switch (op->addr.nbytes) { + case 0: + break; + case 1: + ifr |= QSPI_IFR_OPTEN | QSPI_IFR_OPTL_8BIT; + icr |= QSPI_ICR_OPT(op->addr.val & 0xff); + break; + case 2: + if (dummy_cycles < 8 / op->addr.buswidth) { + ifr &= ~QSPI_IFR_INSTEN; + ifr |= QSPI_IFR_ADDREN; + iar = (op->cmd.opcode << 16) | + (op->addr.val & 0xffff); + } else { + ifr |= QSPI_IFR_ADDREN; + iar = (op->addr.val << 8) & 0xffffff; + dummy_cycles -= 8 / op->addr.buswidth; + } + break; + case 3: + ifr |= QSPI_IFR_ADDREN; + iar = op->addr.val & 0xffffff; + break; + case 4: + ifr |= QSPI_IFR_ADDREN | QSPI_IFR_ADDRL; + iar = op->addr.val & 0x7ffffff; + break; + default: + return -ENOTSUPP; + } + } + + /* offset of the data access in the QSPI memory space */ + *offset = iar; + + /* Set number of dummy cycles */ + if (dummy_cycles) + ifr |= QSPI_IFR_NBDUM(dummy_cycles); + + /* Set data enable and data transfer type. */ + if (op->data.nbytes) { + ifr |= QSPI_IFR_DATAEN; + + if (op->addr.nbytes) + ifr |= QSPI_IFR_TFRTYP_MEM; + } + + /* + * If the QSPI controller is set in regular SPI mode, set it in + * Serial Memory Mode (SMM). + */ + if (aq->mr != QSPI_MR_SMM) { + atmel_qspi_write(QSPI_MR_SMM, aq, QSPI_MR); + aq->mr = QSPI_MR_SMM; + } + + /* Clear pending interrupts */ + (void)atmel_qspi_read(aq, QSPI_SR); + + if (aq->caps->has_ricr) { + if (!op->addr.nbytes && op->data.dir == SPI_MEM_DATA_IN) + ifr |= QSPI_IFR_APBTFRTYP_READ; + + /* Set QSPI Instruction Frame registers */ + atmel_qspi_write(iar, aq, QSPI_IAR); + if (op->data.dir == SPI_MEM_DATA_IN) + atmel_qspi_write(icr, aq, QSPI_RICR); + else + atmel_qspi_write(icr, aq, QSPI_WICR); + atmel_qspi_write(ifr, aq, QSPI_IFR); + } else { + if (op->data.nbytes && op->data.dir == SPI_MEM_DATA_OUT) + ifr |= QSPI_IFR_SAMA5D2_WRITE_TRSFR; + + /* Set QSPI Instruction Frame registers */ + atmel_qspi_write(iar, aq, QSPI_IAR); + atmel_qspi_write(icr, aq, QSPI_ICR); + atmel_qspi_write(ifr, aq, QSPI_IFR); + } + + return 0; +} + +static int atmel_qspi_exec_op(struct spi_mem *mem, const struct spi_mem_op *op) +{ + struct atmel_qspi *aq = spi_controller_get_devdata(mem->spi->master); + u32 sr, offset; + int err; + + /* + * Check if the address exceeds the MMIO window size. An improvement + * would be to add support for regular SPI mode and fall back to it + * when the flash memories overrun the controller's memory space. + */ + if (op->addr.val + op->data.nbytes > aq->mmap_size) + return -ENOTSUPP; + + err = atmel_qspi_set_cfg(aq, op, &offset); + if (err) + return err; + + /* Skip to the final steps if there is no data */ + if (op->data.nbytes) { + /* Dummy read of QSPI_IFR to synchronize APB and AHB accesses */ + (void)atmel_qspi_read(aq, QSPI_IFR); + + /* Send/Receive data */ + if (op->data.dir == SPI_MEM_DATA_IN) + memcpy_fromio(op->data.buf.in, aq->mem + offset, + op->data.nbytes); + else + memcpy_toio(aq->mem + offset, op->data.buf.out, + op->data.nbytes); + + /* Release the chip-select */ + atmel_qspi_write(QSPI_CR_LASTXFER, aq, QSPI_CR); + } + + /* Poll INSTRuction End status */ + sr = atmel_qspi_read(aq, QSPI_SR); + if ((sr & QSPI_SR_CMD_COMPLETED) == QSPI_SR_CMD_COMPLETED) + return err; + + /* Wait for INSTRuction End interrupt */ + reinit_completion(&aq->cmd_completion); + aq->pending = sr & QSPI_SR_CMD_COMPLETED; + atmel_qspi_write(QSPI_SR_CMD_COMPLETED, aq, QSPI_IER); + if (!wait_for_completion_timeout(&aq->cmd_completion, + msecs_to_jiffies(1000))) + err = -ETIMEDOUT; + atmel_qspi_write(QSPI_SR_CMD_COMPLETED, aq, QSPI_IDR); + + return err; +} + +static const char *atmel_qspi_get_name(struct spi_mem *spimem) +{ + return dev_name(spimem->spi->dev.parent); +} + +static const struct spi_controller_mem_ops atmel_qspi_mem_ops = { + .supports_op = atmel_qspi_supports_op, + .exec_op = atmel_qspi_exec_op, + .get_name = atmel_qspi_get_name +}; + +static int atmel_qspi_setup(struct spi_device *spi) +{ + struct spi_controller *ctrl = spi->master; + struct atmel_qspi *aq = spi_controller_get_devdata(ctrl); + unsigned long src_rate; + u32 scbr; + + if (ctrl->busy) + return -EBUSY; + + if (!spi->max_speed_hz) + return -EINVAL; + + src_rate = clk_get_rate(aq->pclk); + if (!src_rate) + return -EINVAL; + + /* Compute the QSPI baudrate */ + scbr = DIV_ROUND_UP(src_rate, spi->max_speed_hz); + if (scbr > 0) + scbr--; + + aq->scr = QSPI_SCR_SCBR(scbr); + atmel_qspi_write(aq->scr, aq, QSPI_SCR); + + return 0; +} + +static void atmel_qspi_init(struct atmel_qspi *aq) +{ + /* Reset the QSPI controller */ + atmel_qspi_write(QSPI_CR_SWRST, aq, QSPI_CR); + + /* Set the QSPI controller by default in Serial Memory Mode */ + atmel_qspi_write(QSPI_MR_SMM, aq, QSPI_MR); + aq->mr = QSPI_MR_SMM; + + /* Enable the QSPI controller */ + atmel_qspi_write(QSPI_CR_QSPIEN, aq, QSPI_CR); +} + +static irqreturn_t atmel_qspi_interrupt(int irq, void *dev_id) +{ + struct atmel_qspi *aq = dev_id; + u32 status, mask, pending; + + status = atmel_qspi_read(aq, QSPI_SR); + mask = atmel_qspi_read(aq, QSPI_IMR); + pending = status & mask; + + if (!pending) + return IRQ_NONE; + + aq->pending |= pending; + if ((aq->pending & QSPI_SR_CMD_COMPLETED) == QSPI_SR_CMD_COMPLETED) + complete(&aq->cmd_completion); + + return IRQ_HANDLED; +} + +static int atmel_qspi_probe(struct platform_device *pdev) +{ + struct spi_controller *ctrl; + struct atmel_qspi *aq; + struct resource *res; + int irq, err = 0; + + ctrl = devm_spi_alloc_master(&pdev->dev, sizeof(*aq)); + if (!ctrl) + return -ENOMEM; + + ctrl->mode_bits = SPI_RX_DUAL | SPI_RX_QUAD | SPI_TX_DUAL | SPI_TX_QUAD; + ctrl->setup = atmel_qspi_setup; + ctrl->bus_num = -1; + ctrl->mem_ops = &atmel_qspi_mem_ops; + ctrl->num_chipselect = 1; + ctrl->dev.of_node = pdev->dev.of_node; + platform_set_drvdata(pdev, ctrl); + + aq = spi_controller_get_devdata(ctrl); + + init_completion(&aq->cmd_completion); + aq->pdev = pdev; + + /* Map the registers */ + res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "qspi_base"); + aq->regs = devm_ioremap_resource(&pdev->dev, res); + if (IS_ERR(aq->regs)) { + dev_err(&pdev->dev, "missing registers\n"); + return PTR_ERR(aq->regs); + } + + /* Map the AHB memory */ + res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "qspi_mmap"); + aq->mem = devm_ioremap_resource(&pdev->dev, res); + if (IS_ERR(aq->mem)) { + dev_err(&pdev->dev, "missing AHB memory\n"); + return PTR_ERR(aq->mem); + } + + aq->mmap_size = resource_size(res); + + /* Get the peripheral clock */ + aq->pclk = devm_clk_get(&pdev->dev, "pclk"); + if (IS_ERR(aq->pclk)) + aq->pclk = devm_clk_get(&pdev->dev, NULL); + + if (IS_ERR(aq->pclk)) { + dev_err(&pdev->dev, "missing peripheral clock\n"); + return PTR_ERR(aq->pclk); + } + + /* Enable the peripheral clock */ + err = clk_prepare_enable(aq->pclk); + if (err) { + dev_err(&pdev->dev, "failed to enable the peripheral clock\n"); + return err; + } + + aq->caps = of_device_get_match_data(&pdev->dev); + if (!aq->caps) { + dev_err(&pdev->dev, "Could not retrieve QSPI caps\n"); + err = -EINVAL; + goto disable_pclk; + } + + if (aq->caps->has_qspick) { + /* Get the QSPI system clock */ + aq->qspick = devm_clk_get(&pdev->dev, "qspick"); + if (IS_ERR(aq->qspick)) { + dev_err(&pdev->dev, "missing system clock\n"); + err = PTR_ERR(aq->qspick); + goto disable_pclk; + } + + /* Enable the QSPI system clock */ + err = clk_prepare_enable(aq->qspick); + if (err) { + dev_err(&pdev->dev, + "failed to enable the QSPI system clock\n"); + goto disable_pclk; + } + } + + /* Request the IRQ */ + irq = platform_get_irq(pdev, 0); + if (irq < 0) { + err = irq; + goto disable_qspick; + } + err = devm_request_irq(&pdev->dev, irq, atmel_qspi_interrupt, + 0, dev_name(&pdev->dev), aq); + if (err) + goto disable_qspick; + + atmel_qspi_init(aq); + + err = spi_register_controller(ctrl); + if (err) + goto disable_qspick; + + return 0; + +disable_qspick: + clk_disable_unprepare(aq->qspick); +disable_pclk: + clk_disable_unprepare(aq->pclk); + + return err; +} + +static int atmel_qspi_remove(struct platform_device *pdev) +{ + struct spi_controller *ctrl = platform_get_drvdata(pdev); + struct atmel_qspi *aq = spi_controller_get_devdata(ctrl); + + spi_unregister_controller(ctrl); + atmel_qspi_write(QSPI_CR_QSPIDIS, aq, QSPI_CR); + clk_disable_unprepare(aq->qspick); + clk_disable_unprepare(aq->pclk); + return 0; +} + +static int __maybe_unused atmel_qspi_suspend(struct device *dev) +{ + struct spi_controller *ctrl = dev_get_drvdata(dev); + struct atmel_qspi *aq = spi_controller_get_devdata(ctrl); + + clk_disable_unprepare(aq->qspick); + clk_disable_unprepare(aq->pclk); + + return 0; +} + +static int __maybe_unused atmel_qspi_resume(struct device *dev) +{ + struct spi_controller *ctrl = dev_get_drvdata(dev); + struct atmel_qspi *aq = spi_controller_get_devdata(ctrl); + + clk_prepare_enable(aq->pclk); + clk_prepare_enable(aq->qspick); + + atmel_qspi_init(aq); + + atmel_qspi_write(aq->scr, aq, QSPI_SCR); + + return 0; +} + +static SIMPLE_DEV_PM_OPS(atmel_qspi_pm_ops, atmel_qspi_suspend, + atmel_qspi_resume); + +static const struct atmel_qspi_caps atmel_sama5d2_qspi_caps = {}; + +static const struct atmel_qspi_caps atmel_sam9x60_qspi_caps = { + .has_qspick = true, + .has_ricr = true, +}; + +static const struct of_device_id atmel_qspi_dt_ids[] = { + { + .compatible = "atmel,sama5d2-qspi", + .data = &atmel_sama5d2_qspi_caps, + }, + { + .compatible = "microchip,sam9x60-qspi", + .data = &atmel_sam9x60_qspi_caps, + }, + { /* sentinel */ } +}; + +MODULE_DEVICE_TABLE(of, atmel_qspi_dt_ids); + +static struct platform_driver atmel_qspi_driver = { + .driver = { + .name = "atmel_qspi", + .of_match_table = atmel_qspi_dt_ids, + .pm = &atmel_qspi_pm_ops, + }, + .probe = atmel_qspi_probe, + .remove = atmel_qspi_remove, +}; +module_platform_driver(atmel_qspi_driver); + +MODULE_AUTHOR("Cyrille Pitchen <cyrille.pitchen@atmel.com>"); +MODULE_AUTHOR("Piotr Bugalski <bugalski.piotr@gmail.com"); +MODULE_DESCRIPTION("Atmel QSPI Controller driver"); +MODULE_LICENSE("GPL v2"); diff --git a/drivers/spi/internals.h b/drivers/spi/internals.h new file mode 100644 index 000000000..4a28a8395 --- /dev/null +++ b/drivers/spi/internals.h @@ -0,0 +1,43 @@ +/* SPDX-License-Identifier: GPL-2.0+ */ +/* + * Copyright (C) 2018 Exceet Electronics GmbH + * Copyright (C) 2018 Bootlin + * + * Author: Boris Brezillon <boris.brezillon@bootlin.com> + * + * Helpers needed by the spi or spi-mem logic. Should not be used outside of + * spi-mem.c and spi.c. + */ + +#ifndef __LINUX_SPI_INTERNALS_H +#define __LINUX_SPI_INTERNALS_H + +#include <linux/device.h> +#include <linux/dma-direction.h> +#include <linux/scatterlist.h> +#include <linux/spi/spi.h> + +void spi_flush_queue(struct spi_controller *ctrl); + +#ifdef CONFIG_HAS_DMA +int spi_map_buf(struct spi_controller *ctlr, struct device *dev, + struct sg_table *sgt, void *buf, size_t len, + enum dma_data_direction dir); +void spi_unmap_buf(struct spi_controller *ctlr, struct device *dev, + struct sg_table *sgt, enum dma_data_direction dir); +#else /* !CONFIG_HAS_DMA */ +static inline int spi_map_buf(struct spi_controller *ctlr, struct device *dev, + struct sg_table *sgt, void *buf, size_t len, + enum dma_data_direction dir) +{ + return -EINVAL; +} + +static inline void spi_unmap_buf(struct spi_controller *ctlr, + struct device *dev, struct sg_table *sgt, + enum dma_data_direction dir) +{ +} +#endif /* CONFIG_HAS_DMA */ + +#endif /* __LINUX_SPI_INTERNALS_H */ diff --git a/drivers/spi/spi-altera.c b/drivers/spi/spi-altera.c new file mode 100644 index 000000000..62ea0c9e3 --- /dev/null +++ b/drivers/spi/spi-altera.c @@ -0,0 +1,378 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Altera SPI driver + * + * Copyright (C) 2008 Thomas Chou <thomas@wytron.com.tw> + * + * Based on spi_s3c24xx.c, which is: + * Copyright (c) 2006 Ben Dooks + * Copyright (c) 2006 Simtec Electronics + * Ben Dooks <ben@simtec.co.uk> + */ + +#include <linux/interrupt.h> +#include <linux/errno.h> +#include <linux/module.h> +#include <linux/platform_device.h> +#include <linux/spi/altera.h> +#include <linux/spi/spi.h> +#include <linux/io.h> +#include <linux/of.h> + +#define DRV_NAME "spi_altera" + +#define ALTERA_SPI_RXDATA 0 +#define ALTERA_SPI_TXDATA 4 +#define ALTERA_SPI_STATUS 8 +#define ALTERA_SPI_CONTROL 12 +#define ALTERA_SPI_SLAVE_SEL 20 + +#define ALTERA_SPI_STATUS_ROE_MSK 0x8 +#define ALTERA_SPI_STATUS_TOE_MSK 0x10 +#define ALTERA_SPI_STATUS_TMT_MSK 0x20 +#define ALTERA_SPI_STATUS_TRDY_MSK 0x40 +#define ALTERA_SPI_STATUS_RRDY_MSK 0x80 +#define ALTERA_SPI_STATUS_E_MSK 0x100 + +#define ALTERA_SPI_CONTROL_IROE_MSK 0x8 +#define ALTERA_SPI_CONTROL_ITOE_MSK 0x10 +#define ALTERA_SPI_CONTROL_ITRDY_MSK 0x40 +#define ALTERA_SPI_CONTROL_IRRDY_MSK 0x80 +#define ALTERA_SPI_CONTROL_IE_MSK 0x100 +#define ALTERA_SPI_CONTROL_SSO_MSK 0x400 + +#define ALTERA_SPI_MAX_CS 32 + +enum altera_spi_type { + ALTERA_SPI_TYPE_UNKNOWN, + ALTERA_SPI_TYPE_SUBDEV, +}; + +struct altera_spi { + int irq; + int len; + int count; + int bytes_per_word; + u32 imr; + + /* data buffers */ + const unsigned char *tx; + unsigned char *rx; + + struct regmap *regmap; + u32 regoff; + struct device *dev; +}; + +static const struct regmap_config spi_altera_config = { + .reg_bits = 32, + .reg_stride = 4, + .val_bits = 32, + .fast_io = true, +}; + +static int altr_spi_writel(struct altera_spi *hw, unsigned int reg, + unsigned int val) +{ + int ret; + + ret = regmap_write(hw->regmap, hw->regoff + reg, val); + if (ret) + dev_err(hw->dev, "fail to write reg 0x%x val 0x%x: %d\n", + reg, val, ret); + + return ret; +} + +static int altr_spi_readl(struct altera_spi *hw, unsigned int reg, + unsigned int *val) +{ + int ret; + + ret = regmap_read(hw->regmap, hw->regoff + reg, val); + if (ret) + dev_err(hw->dev, "fail to read reg 0x%x: %d\n", reg, ret); + + return ret; +} + +static inline struct altera_spi *altera_spi_to_hw(struct spi_device *sdev) +{ + return spi_master_get_devdata(sdev->master); +} + +static void altera_spi_set_cs(struct spi_device *spi, bool is_high) +{ + struct altera_spi *hw = altera_spi_to_hw(spi); + + if (is_high) { + hw->imr &= ~ALTERA_SPI_CONTROL_SSO_MSK; + altr_spi_writel(hw, ALTERA_SPI_CONTROL, hw->imr); + altr_spi_writel(hw, ALTERA_SPI_SLAVE_SEL, 0); + } else { + altr_spi_writel(hw, ALTERA_SPI_SLAVE_SEL, + BIT(spi->chip_select)); + hw->imr |= ALTERA_SPI_CONTROL_SSO_MSK; + altr_spi_writel(hw, ALTERA_SPI_CONTROL, hw->imr); + } +} + +static void altera_spi_tx_word(struct altera_spi *hw) +{ + unsigned int txd = 0; + + if (hw->tx) { + switch (hw->bytes_per_word) { + case 1: + txd = hw->tx[hw->count]; + break; + case 2: + txd = (hw->tx[hw->count * 2] + | (hw->tx[hw->count * 2 + 1] << 8)); + break; + case 4: + txd = (hw->tx[hw->count * 4] + | (hw->tx[hw->count * 4 + 1] << 8) + | (hw->tx[hw->count * 4 + 2] << 16) + | (hw->tx[hw->count * 4 + 3] << 24)); + break; + + } + } + + altr_spi_writel(hw, ALTERA_SPI_TXDATA, txd); +} + +static void altera_spi_rx_word(struct altera_spi *hw) +{ + unsigned int rxd; + + altr_spi_readl(hw, ALTERA_SPI_RXDATA, &rxd); + if (hw->rx) { + switch (hw->bytes_per_word) { + case 1: + hw->rx[hw->count] = rxd; + break; + case 2: + hw->rx[hw->count * 2] = rxd; + hw->rx[hw->count * 2 + 1] = rxd >> 8; + break; + case 4: + hw->rx[hw->count * 4] = rxd; + hw->rx[hw->count * 4 + 1] = rxd >> 8; + hw->rx[hw->count * 4 + 2] = rxd >> 16; + hw->rx[hw->count * 4 + 3] = rxd >> 24; + break; + + } + } + + hw->count++; +} + +static int altera_spi_txrx(struct spi_master *master, + struct spi_device *spi, struct spi_transfer *t) +{ + struct altera_spi *hw = spi_master_get_devdata(master); + u32 val; + + hw->tx = t->tx_buf; + hw->rx = t->rx_buf; + hw->count = 0; + hw->bytes_per_word = DIV_ROUND_UP(t->bits_per_word, 8); + hw->len = t->len / hw->bytes_per_word; + + if (hw->irq >= 0) { + /* enable receive interrupt */ + hw->imr |= ALTERA_SPI_CONTROL_IRRDY_MSK; + altr_spi_writel(hw, ALTERA_SPI_CONTROL, hw->imr); + + /* send the first byte */ + altera_spi_tx_word(hw); + + return 1; + } + + while (hw->count < hw->len) { + altera_spi_tx_word(hw); + + for (;;) { + altr_spi_readl(hw, ALTERA_SPI_STATUS, &val); + if (val & ALTERA_SPI_STATUS_RRDY_MSK) + break; + + cpu_relax(); + } + + altera_spi_rx_word(hw); + } + spi_finalize_current_transfer(master); + + return 0; +} + +static irqreturn_t altera_spi_irq(int irq, void *dev) +{ + struct spi_master *master = dev; + struct altera_spi *hw = spi_master_get_devdata(master); + + altera_spi_rx_word(hw); + + if (hw->count < hw->len) { + altera_spi_tx_word(hw); + } else { + /* disable receive interrupt */ + hw->imr &= ~ALTERA_SPI_CONTROL_IRRDY_MSK; + altr_spi_writel(hw, ALTERA_SPI_CONTROL, hw->imr); + + spi_finalize_current_transfer(master); + } + + return IRQ_HANDLED; +} + +static int altera_spi_probe(struct platform_device *pdev) +{ + const struct platform_device_id *platid = platform_get_device_id(pdev); + struct altera_spi_platform_data *pdata = dev_get_platdata(&pdev->dev); + enum altera_spi_type type = ALTERA_SPI_TYPE_UNKNOWN; + struct altera_spi *hw; + struct spi_master *master; + int err = -ENODEV; + u32 val; + u16 i; + + master = spi_alloc_master(&pdev->dev, sizeof(struct altera_spi)); + if (!master) + return err; + + /* setup the master state. */ + master->bus_num = pdev->id; + + if (pdata) { + if (pdata->num_chipselect > ALTERA_SPI_MAX_CS) { + dev_err(&pdev->dev, + "Invalid number of chipselect: %hu\n", + pdata->num_chipselect); + err = -EINVAL; + goto exit; + } + + master->num_chipselect = pdata->num_chipselect; + master->mode_bits = pdata->mode_bits; + master->bits_per_word_mask = pdata->bits_per_word_mask; + } else { + master->num_chipselect = 16; + master->mode_bits = SPI_CS_HIGH; + master->bits_per_word_mask = SPI_BPW_RANGE_MASK(1, 16); + } + + master->dev.of_node = pdev->dev.of_node; + master->transfer_one = altera_spi_txrx; + master->set_cs = altera_spi_set_cs; + + hw = spi_master_get_devdata(master); + hw->dev = &pdev->dev; + + if (platid) + type = platid->driver_data; + + /* find and map our resources */ + if (type == ALTERA_SPI_TYPE_SUBDEV) { + struct resource *regoff; + + hw->regmap = dev_get_regmap(pdev->dev.parent, NULL); + if (!hw->regmap) { + dev_err(&pdev->dev, "get regmap failed\n"); + goto exit; + } + + regoff = platform_get_resource(pdev, IORESOURCE_REG, 0); + if (regoff) + hw->regoff = regoff->start; + } else { + void __iomem *res; + + res = devm_platform_ioremap_resource(pdev, 0); + if (IS_ERR(res)) { + err = PTR_ERR(res); + goto exit; + } + + hw->regmap = devm_regmap_init_mmio(&pdev->dev, res, + &spi_altera_config); + if (IS_ERR(hw->regmap)) { + dev_err(&pdev->dev, "regmap mmio init failed\n"); + err = PTR_ERR(hw->regmap); + goto exit; + } + } + + /* program defaults into the registers */ + hw->imr = 0; /* disable spi interrupts */ + altr_spi_writel(hw, ALTERA_SPI_CONTROL, hw->imr); + altr_spi_writel(hw, ALTERA_SPI_STATUS, 0); /* clear status reg */ + altr_spi_readl(hw, ALTERA_SPI_STATUS, &val); + if (val & ALTERA_SPI_STATUS_RRDY_MSK) + altr_spi_readl(hw, ALTERA_SPI_RXDATA, &val); /* flush rxdata */ + /* irq is optional */ + hw->irq = platform_get_irq(pdev, 0); + if (hw->irq >= 0) { + err = devm_request_irq(&pdev->dev, hw->irq, altera_spi_irq, 0, + pdev->name, master); + if (err) + goto exit; + } + + err = devm_spi_register_master(&pdev->dev, master); + if (err) + goto exit; + + if (pdata) { + for (i = 0; i < pdata->num_devices; i++) { + if (!spi_new_device(master, pdata->devices + i)) + dev_warn(&pdev->dev, + "unable to create SPI device: %s\n", + pdata->devices[i].modalias); + } + } + + dev_info(&pdev->dev, "regoff %u, irq %d\n", hw->regoff, hw->irq); + + return 0; +exit: + spi_master_put(master); + return err; +} + +#ifdef CONFIG_OF +static const struct of_device_id altera_spi_match[] = { + { .compatible = "ALTR,spi-1.0", }, + { .compatible = "altr,spi-1.0", }, + {}, +}; +MODULE_DEVICE_TABLE(of, altera_spi_match); +#endif /* CONFIG_OF */ + +static const struct platform_device_id altera_spi_ids[] = { + { DRV_NAME, ALTERA_SPI_TYPE_UNKNOWN }, + { "subdev_spi_altera", ALTERA_SPI_TYPE_SUBDEV }, + { } +}; +MODULE_DEVICE_TABLE(platform, altera_spi_ids); + +static struct platform_driver altera_spi_driver = { + .probe = altera_spi_probe, + .driver = { + .name = DRV_NAME, + .pm = NULL, + .of_match_table = of_match_ptr(altera_spi_match), + }, + .id_table = altera_spi_ids, +}; +module_platform_driver(altera_spi_driver); + +MODULE_DESCRIPTION("Altera SPI driver"); +MODULE_AUTHOR("Thomas Chou <thomas@wytron.com.tw>"); +MODULE_LICENSE("GPL"); +MODULE_ALIAS("platform:" DRV_NAME); diff --git a/drivers/spi/spi-amd.c b/drivers/spi/spi-amd.c new file mode 100644 index 000000000..a027cfd49 --- /dev/null +++ b/drivers/spi/spi-amd.c @@ -0,0 +1,325 @@ +// SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause +// +// AMD SPI controller driver +// +// Copyright (c) 2020, Advanced Micro Devices, Inc. +// +// Author: Sanjay R Mehta <sanju.mehta@amd.com> + +#include <linux/acpi.h> +#include <linux/init.h> +#include <linux/module.h> +#include <linux/platform_device.h> +#include <linux/delay.h> +#include <linux/spi/spi.h> + +#define AMD_SPI_CTRL0_REG 0x00 +#define AMD_SPI_EXEC_CMD BIT(16) +#define AMD_SPI_FIFO_CLEAR BIT(20) +#define AMD_SPI_BUSY BIT(31) + +#define AMD_SPI_OPCODE_MASK 0xFF + +#define AMD_SPI_ALT_CS_REG 0x1D +#define AMD_SPI_ALT_CS_MASK 0x3 + +#define AMD_SPI_FIFO_BASE 0x80 +#define AMD_SPI_TX_COUNT_REG 0x48 +#define AMD_SPI_RX_COUNT_REG 0x4B +#define AMD_SPI_STATUS_REG 0x4C + +#define AMD_SPI_FIFO_SIZE 70 +#define AMD_SPI_MEM_SIZE 200 + +/* M_CMD OP codes for SPI */ +#define AMD_SPI_XFER_TX 1 +#define AMD_SPI_XFER_RX 2 + +struct amd_spi { + void __iomem *io_remap_addr; + unsigned long io_base_addr; + u32 rom_addr; + u8 chip_select; +}; + +static inline u8 amd_spi_readreg8(struct spi_master *master, int idx) +{ + struct amd_spi *amd_spi = spi_master_get_devdata(master); + + return ioread8((u8 __iomem *)amd_spi->io_remap_addr + idx); +} + +static inline void amd_spi_writereg8(struct spi_master *master, int idx, + u8 val) +{ + struct amd_spi *amd_spi = spi_master_get_devdata(master); + + iowrite8(val, ((u8 __iomem *)amd_spi->io_remap_addr + idx)); +} + +static inline void amd_spi_setclear_reg8(struct spi_master *master, int idx, + u8 set, u8 clear) +{ + u8 tmp = amd_spi_readreg8(master, idx); + + tmp = (tmp & ~clear) | set; + amd_spi_writereg8(master, idx, tmp); +} + +static inline u32 amd_spi_readreg32(struct spi_master *master, int idx) +{ + struct amd_spi *amd_spi = spi_master_get_devdata(master); + + return ioread32((u8 __iomem *)amd_spi->io_remap_addr + idx); +} + +static inline void amd_spi_writereg32(struct spi_master *master, int idx, + u32 val) +{ + struct amd_spi *amd_spi = spi_master_get_devdata(master); + + iowrite32(val, ((u8 __iomem *)amd_spi->io_remap_addr + idx)); +} + +static inline void amd_spi_setclear_reg32(struct spi_master *master, int idx, + u32 set, u32 clear) +{ + u32 tmp = amd_spi_readreg32(master, idx); + + tmp = (tmp & ~clear) | set; + amd_spi_writereg32(master, idx, tmp); +} + +static void amd_spi_select_chip(struct spi_master *master) +{ + struct amd_spi *amd_spi = spi_master_get_devdata(master); + u8 chip_select = amd_spi->chip_select; + + amd_spi_setclear_reg8(master, AMD_SPI_ALT_CS_REG, chip_select, + AMD_SPI_ALT_CS_MASK); +} + +static void amd_spi_clear_fifo_ptr(struct spi_master *master) +{ + amd_spi_setclear_reg32(master, AMD_SPI_CTRL0_REG, AMD_SPI_FIFO_CLEAR, + AMD_SPI_FIFO_CLEAR); +} + +static void amd_spi_set_opcode(struct spi_master *master, u8 cmd_opcode) +{ + amd_spi_setclear_reg32(master, AMD_SPI_CTRL0_REG, cmd_opcode, + AMD_SPI_OPCODE_MASK); +} + +static inline void amd_spi_set_rx_count(struct spi_master *master, + u8 rx_count) +{ + amd_spi_setclear_reg8(master, AMD_SPI_RX_COUNT_REG, rx_count, 0xff); +} + +static inline void amd_spi_set_tx_count(struct spi_master *master, + u8 tx_count) +{ + amd_spi_setclear_reg8(master, AMD_SPI_TX_COUNT_REG, tx_count, 0xff); +} + +static inline int amd_spi_busy_wait(struct amd_spi *amd_spi) +{ + bool spi_busy; + int timeout = 100000; + + /* poll for SPI bus to become idle */ + spi_busy = (ioread32((u8 __iomem *)amd_spi->io_remap_addr + + AMD_SPI_CTRL0_REG) & AMD_SPI_BUSY) == AMD_SPI_BUSY; + while (spi_busy) { + usleep_range(10, 20); + if (timeout-- < 0) + return -ETIMEDOUT; + + spi_busy = (ioread32((u8 __iomem *)amd_spi->io_remap_addr + + AMD_SPI_CTRL0_REG) & AMD_SPI_BUSY) == AMD_SPI_BUSY; + } + + return 0; +} + +static void amd_spi_execute_opcode(struct spi_master *master) +{ + struct amd_spi *amd_spi = spi_master_get_devdata(master); + + /* Set ExecuteOpCode bit in the CTRL0 register */ + amd_spi_setclear_reg32(master, AMD_SPI_CTRL0_REG, AMD_SPI_EXEC_CMD, + AMD_SPI_EXEC_CMD); + + amd_spi_busy_wait(amd_spi); +} + +static int amd_spi_master_setup(struct spi_device *spi) +{ + struct spi_master *master = spi->master; + + amd_spi_clear_fifo_ptr(master); + + return 0; +} + +static inline int amd_spi_fifo_xfer(struct amd_spi *amd_spi, + struct spi_master *master, + struct spi_message *message) +{ + struct spi_transfer *xfer = NULL; + u8 cmd_opcode; + u8 *buf = NULL; + u32 m_cmd = 0; + u32 i = 0; + u32 tx_len = 0, rx_len = 0; + + list_for_each_entry(xfer, &message->transfers, + transfer_list) { + if (xfer->rx_buf) + m_cmd = AMD_SPI_XFER_RX; + if (xfer->tx_buf) + m_cmd = AMD_SPI_XFER_TX; + + if (m_cmd & AMD_SPI_XFER_TX) { + buf = (u8 *)xfer->tx_buf; + tx_len = xfer->len - 1; + cmd_opcode = *(u8 *)xfer->tx_buf; + buf++; + amd_spi_set_opcode(master, cmd_opcode); + + /* Write data into the FIFO. */ + for (i = 0; i < tx_len; i++) { + iowrite8(buf[i], + ((u8 __iomem *)amd_spi->io_remap_addr + + AMD_SPI_FIFO_BASE + i)); + } + + amd_spi_set_tx_count(master, tx_len); + amd_spi_clear_fifo_ptr(master); + /* Execute command */ + amd_spi_execute_opcode(master); + } + if (m_cmd & AMD_SPI_XFER_RX) { + /* + * Store no. of bytes to be received from + * FIFO + */ + rx_len = xfer->len; + buf = (u8 *)xfer->rx_buf; + amd_spi_set_rx_count(master, rx_len); + amd_spi_clear_fifo_ptr(master); + /* Execute command */ + amd_spi_execute_opcode(master); + /* Read data from FIFO to receive buffer */ + for (i = 0; i < rx_len; i++) + buf[i] = amd_spi_readreg8(master, + AMD_SPI_FIFO_BASE + + tx_len + i); + } + } + + /* Update statistics */ + message->actual_length = tx_len + rx_len + 1; + /* complete the transaction */ + message->status = 0; + spi_finalize_current_message(master); + + return 0; +} + +static int amd_spi_master_transfer(struct spi_master *master, + struct spi_message *msg) +{ + struct amd_spi *amd_spi = spi_master_get_devdata(master); + struct spi_device *spi = msg->spi; + + amd_spi->chip_select = spi->chip_select; + amd_spi_select_chip(master); + + /* + * Extract spi_transfers from the spi message and + * program the controller. + */ + amd_spi_fifo_xfer(amd_spi, master, msg); + + return 0; +} + +static size_t amd_spi_max_transfer_size(struct spi_device *spi) +{ + return AMD_SPI_FIFO_SIZE; +} + +static int amd_spi_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct spi_master *master; + struct amd_spi *amd_spi; + struct resource *res; + int err = 0; + + /* Allocate storage for spi_master and driver private data */ + master = spi_alloc_master(dev, sizeof(struct amd_spi)); + if (!master) { + dev_err(dev, "Error allocating SPI master\n"); + return -ENOMEM; + } + + amd_spi = spi_master_get_devdata(master); + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + amd_spi->io_remap_addr = devm_ioremap_resource(&pdev->dev, res); + if (IS_ERR(amd_spi->io_remap_addr)) { + err = PTR_ERR(amd_spi->io_remap_addr); + dev_err(dev, "error %d ioremap of SPI registers failed\n", err); + goto err_free_master; + } + dev_dbg(dev, "io_remap_address: %p\n", amd_spi->io_remap_addr); + + /* Initialize the spi_master fields */ + master->bus_num = 0; + master->num_chipselect = 4; + master->mode_bits = 0; + master->flags = SPI_MASTER_HALF_DUPLEX; + master->setup = amd_spi_master_setup; + master->transfer_one_message = amd_spi_master_transfer; + master->max_transfer_size = amd_spi_max_transfer_size; + master->max_message_size = amd_spi_max_transfer_size; + + /* Register the controller with SPI framework */ + err = devm_spi_register_master(dev, master); + if (err) { + dev_err(dev, "error %d registering SPI controller\n", err); + goto err_free_master; + } + + return 0; + +err_free_master: + spi_master_put(master); + + return err; +} + +#ifdef CONFIG_ACPI +static const struct acpi_device_id spi_acpi_match[] = { + { "AMDI0061", 0 }, + {}, +}; +MODULE_DEVICE_TABLE(acpi, spi_acpi_match); +#endif + +static struct platform_driver amd_spi_driver = { + .driver = { + .name = "amd_spi", + .acpi_match_table = ACPI_PTR(spi_acpi_match), + }, + .probe = amd_spi_probe, +}; + +module_platform_driver(amd_spi_driver); + +MODULE_LICENSE("Dual BSD/GPL"); +MODULE_AUTHOR("Sanjay Mehta <sanju.mehta@amd.com>"); +MODULE_DESCRIPTION("AMD SPI Master Controller Driver"); diff --git a/drivers/spi/spi-ar934x.c b/drivers/spi/spi-ar934x.c new file mode 100644 index 000000000..def32e0aa --- /dev/null +++ b/drivers/spi/spi-ar934x.c @@ -0,0 +1,243 @@ +// SPDX-License-Identifier: GPL-2.0 +// +// SPI controller driver for Qualcomm Atheros AR934x/QCA95xx SoCs +// +// Copyright (C) 2020 Chuanhong Guo <gch981213@gmail.com> +// +// Based on spi-mt7621.c: +// Copyright (C) 2011 Sergiy <piratfm@gmail.com> +// Copyright (C) 2011-2013 Gabor Juhos <juhosg@openwrt.org> +// Copyright (C) 2014-2015 Felix Fietkau <nbd@nbd.name> + +#include <linux/clk.h> +#include <linux/io.h> +#include <linux/iopoll.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/of_device.h> +#include <linux/spi/spi.h> + +#define DRIVER_NAME "spi-ar934x" + +#define AR934X_SPI_REG_FS 0x00 +#define AR934X_SPI_ENABLE BIT(0) + +#define AR934X_SPI_REG_IOC 0x08 +#define AR934X_SPI_IOC_INITVAL 0x70000 + +#define AR934X_SPI_REG_CTRL 0x04 +#define AR934X_SPI_CLK_MASK GENMASK(5, 0) + +#define AR934X_SPI_DATAOUT 0x10 + +#define AR934X_SPI_REG_SHIFT_CTRL 0x14 +#define AR934X_SPI_SHIFT_EN BIT(31) +#define AR934X_SPI_SHIFT_CS(n) BIT(28 + (n)) +#define AR934X_SPI_SHIFT_TERM 26 +#define AR934X_SPI_SHIFT_VAL(cs, term, count) \ + (AR934X_SPI_SHIFT_EN | AR934X_SPI_SHIFT_CS(cs) | \ + (term) << AR934X_SPI_SHIFT_TERM | (count)) + +#define AR934X_SPI_DATAIN 0x18 + +struct ar934x_spi { + struct spi_controller *ctlr; + void __iomem *base; + struct clk *clk; + unsigned int clk_freq; +}; + +static inline int ar934x_spi_clk_div(struct ar934x_spi *sp, unsigned int freq) +{ + int div = DIV_ROUND_UP(sp->clk_freq, freq * 2) - 1; + + if (div < 0) + return 0; + else if (div > AR934X_SPI_CLK_MASK) + return -EINVAL; + else + return div; +} + +static int ar934x_spi_setup(struct spi_device *spi) +{ + struct ar934x_spi *sp = spi_controller_get_devdata(spi->master); + + if ((spi->max_speed_hz == 0) || + (spi->max_speed_hz > (sp->clk_freq / 2))) { + spi->max_speed_hz = sp->clk_freq / 2; + } else if (spi->max_speed_hz < (sp->clk_freq / 128)) { + dev_err(&spi->dev, "spi clock is too low\n"); + return -EINVAL; + } + + return 0; +} + +static int ar934x_spi_transfer_one_message(struct spi_controller *master, + struct spi_message *m) +{ + struct ar934x_spi *sp = spi_controller_get_devdata(master); + struct spi_transfer *t = NULL; + struct spi_device *spi = m->spi; + unsigned long trx_done, trx_cur; + int stat = 0; + u8 term = 0; + int div, i; + u32 reg; + const u8 *tx_buf; + u8 *buf; + + m->actual_length = 0; + list_for_each_entry(t, &m->transfers, transfer_list) { + if (t->speed_hz) + div = ar934x_spi_clk_div(sp, t->speed_hz); + else + div = ar934x_spi_clk_div(sp, spi->max_speed_hz); + if (div < 0) { + stat = -EIO; + goto msg_done; + } + + reg = ioread32(sp->base + AR934X_SPI_REG_CTRL); + reg &= ~AR934X_SPI_CLK_MASK; + reg |= div; + iowrite32(reg, sp->base + AR934X_SPI_REG_CTRL); + iowrite32(0, sp->base + AR934X_SPI_DATAOUT); + + for (trx_done = 0; trx_done < t->len; trx_done += 4) { + trx_cur = t->len - trx_done; + if (trx_cur > 4) + trx_cur = 4; + else if (list_is_last(&t->transfer_list, &m->transfers)) + term = 1; + + if (t->tx_buf) { + tx_buf = t->tx_buf + trx_done; + reg = tx_buf[0]; + for (i = 1; i < trx_cur; i++) + reg = reg << 8 | tx_buf[i]; + iowrite32(reg, sp->base + AR934X_SPI_DATAOUT); + } + + reg = AR934X_SPI_SHIFT_VAL(spi->chip_select, term, + trx_cur * 8); + iowrite32(reg, sp->base + AR934X_SPI_REG_SHIFT_CTRL); + stat = readl_poll_timeout( + sp->base + AR934X_SPI_REG_SHIFT_CTRL, reg, + !(reg & AR934X_SPI_SHIFT_EN), 0, 5); + if (stat < 0) + goto msg_done; + + if (t->rx_buf) { + reg = ioread32(sp->base + AR934X_SPI_DATAIN); + buf = t->rx_buf + trx_done; + for (i = 0; i < trx_cur; i++) { + buf[trx_cur - i - 1] = reg & 0xff; + reg >>= 8; + } + } + } + m->actual_length += t->len; + } + +msg_done: + m->status = stat; + spi_finalize_current_message(master); + + return 0; +} + +static const struct of_device_id ar934x_spi_match[] = { + { .compatible = "qca,ar934x-spi" }, + {}, +}; +MODULE_DEVICE_TABLE(of, ar934x_spi_match); + +static int ar934x_spi_probe(struct platform_device *pdev) +{ + struct spi_controller *ctlr; + struct ar934x_spi *sp; + void __iomem *base; + struct clk *clk; + int ret; + + base = devm_platform_ioremap_resource(pdev, 0); + if (IS_ERR(base)) + return PTR_ERR(base); + + clk = devm_clk_get(&pdev->dev, NULL); + if (IS_ERR(clk)) { + dev_err(&pdev->dev, "failed to get clock\n"); + return PTR_ERR(clk); + } + + ret = clk_prepare_enable(clk); + if (ret) + return ret; + + ctlr = devm_spi_alloc_master(&pdev->dev, sizeof(*sp)); + if (!ctlr) { + dev_info(&pdev->dev, "failed to allocate spi controller\n"); + ret = -ENOMEM; + goto err_clk_disable; + } + + /* disable flash mapping and expose spi controller registers */ + iowrite32(AR934X_SPI_ENABLE, base + AR934X_SPI_REG_FS); + /* restore pins to default state: CSn=1 DO=CLK=0 */ + iowrite32(AR934X_SPI_IOC_INITVAL, base + AR934X_SPI_REG_IOC); + + ctlr->mode_bits = SPI_LSB_FIRST; + ctlr->setup = ar934x_spi_setup; + ctlr->transfer_one_message = ar934x_spi_transfer_one_message; + ctlr->bits_per_word_mask = SPI_BPW_MASK(8); + ctlr->dev.of_node = pdev->dev.of_node; + ctlr->num_chipselect = 3; + + dev_set_drvdata(&pdev->dev, ctlr); + + sp = spi_controller_get_devdata(ctlr); + sp->base = base; + sp->clk = clk; + sp->clk_freq = clk_get_rate(clk); + sp->ctlr = ctlr; + + ret = spi_register_controller(ctlr); + if (!ret) + return 0; + +err_clk_disable: + clk_disable_unprepare(clk); + return ret; +} + +static int ar934x_spi_remove(struct platform_device *pdev) +{ + struct spi_controller *ctlr; + struct ar934x_spi *sp; + + ctlr = dev_get_drvdata(&pdev->dev); + sp = spi_controller_get_devdata(ctlr); + + spi_unregister_controller(ctlr); + clk_disable_unprepare(sp->clk); + + return 0; +} + +static struct platform_driver ar934x_spi_driver = { + .driver = { + .name = DRIVER_NAME, + .of_match_table = ar934x_spi_match, + }, + .probe = ar934x_spi_probe, + .remove = ar934x_spi_remove, +}; + +module_platform_driver(ar934x_spi_driver); + +MODULE_DESCRIPTION("SPI controller driver for Qualcomm Atheros AR934x/QCA95xx"); +MODULE_AUTHOR("Chuanhong Guo <gch981213@gmail.com>"); +MODULE_LICENSE("GPL v2"); +MODULE_ALIAS("platform:" DRIVER_NAME); diff --git a/drivers/spi/spi-armada-3700.c b/drivers/spi/spi-armada-3700.c new file mode 100644 index 000000000..d8cc4b270 --- /dev/null +++ b/drivers/spi/spi-armada-3700.c @@ -0,0 +1,935 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Marvell Armada-3700 SPI controller driver + * + * Copyright (C) 2016 Marvell Ltd. + * + * Author: Wilson Ding <dingwei@marvell.com> + * Author: Romain Perier <romain.perier@free-electrons.com> + */ + +#include <linux/clk.h> +#include <linux/completion.h> +#include <linux/delay.h> +#include <linux/err.h> +#include <linux/interrupt.h> +#include <linux/io.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/of.h> +#include <linux/of_irq.h> +#include <linux/of_device.h> +#include <linux/pinctrl/consumer.h> +#include <linux/spi/spi.h> + +#define DRIVER_NAME "armada_3700_spi" + +#define A3700_SPI_MAX_SPEED_HZ 100000000 +#define A3700_SPI_MAX_PRESCALE 30 +#define A3700_SPI_TIMEOUT 10 + +/* SPI Register Offest */ +#define A3700_SPI_IF_CTRL_REG 0x00 +#define A3700_SPI_IF_CFG_REG 0x04 +#define A3700_SPI_DATA_OUT_REG 0x08 +#define A3700_SPI_DATA_IN_REG 0x0C +#define A3700_SPI_IF_INST_REG 0x10 +#define A3700_SPI_IF_ADDR_REG 0x14 +#define A3700_SPI_IF_RMODE_REG 0x18 +#define A3700_SPI_IF_HDR_CNT_REG 0x1C +#define A3700_SPI_IF_DIN_CNT_REG 0x20 +#define A3700_SPI_IF_TIME_REG 0x24 +#define A3700_SPI_INT_STAT_REG 0x28 +#define A3700_SPI_INT_MASK_REG 0x2C + +/* A3700_SPI_IF_CTRL_REG */ +#define A3700_SPI_EN BIT(16) +#define A3700_SPI_ADDR_NOT_CONFIG BIT(12) +#define A3700_SPI_WFIFO_OVERFLOW BIT(11) +#define A3700_SPI_WFIFO_UNDERFLOW BIT(10) +#define A3700_SPI_RFIFO_OVERFLOW BIT(9) +#define A3700_SPI_RFIFO_UNDERFLOW BIT(8) +#define A3700_SPI_WFIFO_FULL BIT(7) +#define A3700_SPI_WFIFO_EMPTY BIT(6) +#define A3700_SPI_RFIFO_FULL BIT(5) +#define A3700_SPI_RFIFO_EMPTY BIT(4) +#define A3700_SPI_WFIFO_RDY BIT(3) +#define A3700_SPI_RFIFO_RDY BIT(2) +#define A3700_SPI_XFER_RDY BIT(1) +#define A3700_SPI_XFER_DONE BIT(0) + +/* A3700_SPI_IF_CFG_REG */ +#define A3700_SPI_WFIFO_THRS BIT(28) +#define A3700_SPI_RFIFO_THRS BIT(24) +#define A3700_SPI_AUTO_CS BIT(20) +#define A3700_SPI_DMA_RD_EN BIT(18) +#define A3700_SPI_FIFO_MODE BIT(17) +#define A3700_SPI_SRST BIT(16) +#define A3700_SPI_XFER_START BIT(15) +#define A3700_SPI_XFER_STOP BIT(14) +#define A3700_SPI_INST_PIN BIT(13) +#define A3700_SPI_ADDR_PIN BIT(12) +#define A3700_SPI_DATA_PIN1 BIT(11) +#define A3700_SPI_DATA_PIN0 BIT(10) +#define A3700_SPI_FIFO_FLUSH BIT(9) +#define A3700_SPI_RW_EN BIT(8) +#define A3700_SPI_CLK_POL BIT(7) +#define A3700_SPI_CLK_PHA BIT(6) +#define A3700_SPI_BYTE_LEN BIT(5) +#define A3700_SPI_CLK_PRESCALE BIT(0) +#define A3700_SPI_CLK_PRESCALE_MASK (0x1f) +#define A3700_SPI_CLK_EVEN_OFFS (0x10) + +#define A3700_SPI_WFIFO_THRS_BIT 28 +#define A3700_SPI_RFIFO_THRS_BIT 24 +#define A3700_SPI_FIFO_THRS_MASK 0x7 + +#define A3700_SPI_DATA_PIN_MASK 0x3 + +/* A3700_SPI_IF_HDR_CNT_REG */ +#define A3700_SPI_DUMMY_CNT_BIT 12 +#define A3700_SPI_DUMMY_CNT_MASK 0x7 +#define A3700_SPI_RMODE_CNT_BIT 8 +#define A3700_SPI_RMODE_CNT_MASK 0x3 +#define A3700_SPI_ADDR_CNT_BIT 4 +#define A3700_SPI_ADDR_CNT_MASK 0x7 +#define A3700_SPI_INSTR_CNT_BIT 0 +#define A3700_SPI_INSTR_CNT_MASK 0x3 + +/* A3700_SPI_IF_TIME_REG */ +#define A3700_SPI_CLK_CAPT_EDGE BIT(7) + +struct a3700_spi { + struct spi_master *master; + void __iomem *base; + struct clk *clk; + unsigned int irq; + unsigned int flags; + bool xmit_data; + const u8 *tx_buf; + u8 *rx_buf; + size_t buf_len; + u8 byte_len; + u32 wait_mask; + struct completion done; +}; + +static u32 spireg_read(struct a3700_spi *a3700_spi, u32 offset) +{ + return readl(a3700_spi->base + offset); +} + +static void spireg_write(struct a3700_spi *a3700_spi, u32 offset, u32 data) +{ + writel(data, a3700_spi->base + offset); +} + +static void a3700_spi_auto_cs_unset(struct a3700_spi *a3700_spi) +{ + u32 val; + + val = spireg_read(a3700_spi, A3700_SPI_IF_CFG_REG); + val &= ~A3700_SPI_AUTO_CS; + spireg_write(a3700_spi, A3700_SPI_IF_CFG_REG, val); +} + +static void a3700_spi_activate_cs(struct a3700_spi *a3700_spi, unsigned int cs) +{ + u32 val; + + val = spireg_read(a3700_spi, A3700_SPI_IF_CTRL_REG); + val |= (A3700_SPI_EN << cs); + spireg_write(a3700_spi, A3700_SPI_IF_CTRL_REG, val); +} + +static void a3700_spi_deactivate_cs(struct a3700_spi *a3700_spi, + unsigned int cs) +{ + u32 val; + + val = spireg_read(a3700_spi, A3700_SPI_IF_CTRL_REG); + val &= ~(A3700_SPI_EN << cs); + spireg_write(a3700_spi, A3700_SPI_IF_CTRL_REG, val); +} + +static int a3700_spi_pin_mode_set(struct a3700_spi *a3700_spi, + unsigned int pin_mode, bool receiving) +{ + u32 val; + + val = spireg_read(a3700_spi, A3700_SPI_IF_CFG_REG); + val &= ~(A3700_SPI_INST_PIN | A3700_SPI_ADDR_PIN); + val &= ~(A3700_SPI_DATA_PIN0 | A3700_SPI_DATA_PIN1); + + switch (pin_mode) { + case SPI_NBITS_SINGLE: + break; + case SPI_NBITS_DUAL: + val |= A3700_SPI_DATA_PIN0; + break; + case SPI_NBITS_QUAD: + val |= A3700_SPI_DATA_PIN1; + /* RX during address reception uses 4-pin */ + if (receiving) + val |= A3700_SPI_ADDR_PIN; + break; + default: + dev_err(&a3700_spi->master->dev, "wrong pin mode %u", pin_mode); + return -EINVAL; + } + + spireg_write(a3700_spi, A3700_SPI_IF_CFG_REG, val); + + return 0; +} + +static void a3700_spi_fifo_mode_set(struct a3700_spi *a3700_spi, bool enable) +{ + u32 val; + + val = spireg_read(a3700_spi, A3700_SPI_IF_CFG_REG); + if (enable) + val |= A3700_SPI_FIFO_MODE; + else + val &= ~A3700_SPI_FIFO_MODE; + spireg_write(a3700_spi, A3700_SPI_IF_CFG_REG, val); +} + +static void a3700_spi_mode_set(struct a3700_spi *a3700_spi, + unsigned int mode_bits) +{ + u32 val; + + val = spireg_read(a3700_spi, A3700_SPI_IF_CFG_REG); + + if (mode_bits & SPI_CPOL) + val |= A3700_SPI_CLK_POL; + else + val &= ~A3700_SPI_CLK_POL; + + if (mode_bits & SPI_CPHA) + val |= A3700_SPI_CLK_PHA; + else + val &= ~A3700_SPI_CLK_PHA; + + spireg_write(a3700_spi, A3700_SPI_IF_CFG_REG, val); +} + +static void a3700_spi_clock_set(struct a3700_spi *a3700_spi, + unsigned int speed_hz) +{ + u32 val; + u32 prescale; + + prescale = DIV_ROUND_UP(clk_get_rate(a3700_spi->clk), speed_hz); + + /* For prescaler values over 15, we can only set it by steps of 2. + * Starting from A3700_SPI_CLK_EVEN_OFFS, we set values from 0 up to + * 30. We only use this range from 16 to 30. + */ + if (prescale > 15) + prescale = A3700_SPI_CLK_EVEN_OFFS + DIV_ROUND_UP(prescale, 2); + + val = spireg_read(a3700_spi, A3700_SPI_IF_CFG_REG); + val = val & ~A3700_SPI_CLK_PRESCALE_MASK; + + val = val | (prescale & A3700_SPI_CLK_PRESCALE_MASK); + spireg_write(a3700_spi, A3700_SPI_IF_CFG_REG, val); + + if (prescale <= 2) { + val = spireg_read(a3700_spi, A3700_SPI_IF_TIME_REG); + val |= A3700_SPI_CLK_CAPT_EDGE; + spireg_write(a3700_spi, A3700_SPI_IF_TIME_REG, val); + } +} + +static void a3700_spi_bytelen_set(struct a3700_spi *a3700_spi, unsigned int len) +{ + u32 val; + + val = spireg_read(a3700_spi, A3700_SPI_IF_CFG_REG); + if (len == 4) + val |= A3700_SPI_BYTE_LEN; + else + val &= ~A3700_SPI_BYTE_LEN; + spireg_write(a3700_spi, A3700_SPI_IF_CFG_REG, val); + + a3700_spi->byte_len = len; +} + +static int a3700_spi_fifo_flush(struct a3700_spi *a3700_spi) +{ + int timeout = A3700_SPI_TIMEOUT; + u32 val; + + val = spireg_read(a3700_spi, A3700_SPI_IF_CFG_REG); + val |= A3700_SPI_FIFO_FLUSH; + spireg_write(a3700_spi, A3700_SPI_IF_CFG_REG, val); + + while (--timeout) { + val = spireg_read(a3700_spi, A3700_SPI_IF_CFG_REG); + if (!(val & A3700_SPI_FIFO_FLUSH)) + return 0; + udelay(1); + } + + return -ETIMEDOUT; +} + +static void a3700_spi_init(struct a3700_spi *a3700_spi) +{ + struct spi_master *master = a3700_spi->master; + u32 val; + int i; + + /* Reset SPI unit */ + val = spireg_read(a3700_spi, A3700_SPI_IF_CFG_REG); + val |= A3700_SPI_SRST; + spireg_write(a3700_spi, A3700_SPI_IF_CFG_REG, val); + + udelay(A3700_SPI_TIMEOUT); + + val = spireg_read(a3700_spi, A3700_SPI_IF_CFG_REG); + val &= ~A3700_SPI_SRST; + spireg_write(a3700_spi, A3700_SPI_IF_CFG_REG, val); + + /* Disable AUTO_CS and deactivate all chip-selects */ + a3700_spi_auto_cs_unset(a3700_spi); + for (i = 0; i < master->num_chipselect; i++) + a3700_spi_deactivate_cs(a3700_spi, i); + + /* Enable FIFO mode */ + a3700_spi_fifo_mode_set(a3700_spi, true); + + /* Set SPI mode */ + a3700_spi_mode_set(a3700_spi, master->mode_bits); + + /* Reset counters */ + spireg_write(a3700_spi, A3700_SPI_IF_HDR_CNT_REG, 0); + spireg_write(a3700_spi, A3700_SPI_IF_DIN_CNT_REG, 0); + + /* Mask the interrupts and clear cause bits */ + spireg_write(a3700_spi, A3700_SPI_INT_MASK_REG, 0); + spireg_write(a3700_spi, A3700_SPI_INT_STAT_REG, ~0U); +} + +static irqreturn_t a3700_spi_interrupt(int irq, void *dev_id) +{ + struct spi_master *master = dev_id; + struct a3700_spi *a3700_spi; + u32 cause; + + a3700_spi = spi_master_get_devdata(master); + + /* Get interrupt causes */ + cause = spireg_read(a3700_spi, A3700_SPI_INT_STAT_REG); + + if (!cause || !(a3700_spi->wait_mask & cause)) + return IRQ_NONE; + + /* mask and acknowledge the SPI interrupts */ + spireg_write(a3700_spi, A3700_SPI_INT_MASK_REG, 0); + spireg_write(a3700_spi, A3700_SPI_INT_STAT_REG, cause); + + /* Wake up the transfer */ + complete(&a3700_spi->done); + + return IRQ_HANDLED; +} + +static bool a3700_spi_wait_completion(struct spi_device *spi) +{ + struct a3700_spi *a3700_spi; + unsigned int timeout; + unsigned int ctrl_reg; + unsigned long timeout_jiffies; + + a3700_spi = spi_master_get_devdata(spi->master); + + /* SPI interrupt is edge-triggered, which means an interrupt will + * be generated only when detecting a specific status bit changed + * from '0' to '1'. So when we start waiting for a interrupt, we + * need to check status bit in control reg first, if it is already 1, + * then we do not need to wait for interrupt + */ + ctrl_reg = spireg_read(a3700_spi, A3700_SPI_IF_CTRL_REG); + if (a3700_spi->wait_mask & ctrl_reg) + return true; + + reinit_completion(&a3700_spi->done); + + spireg_write(a3700_spi, A3700_SPI_INT_MASK_REG, + a3700_spi->wait_mask); + + timeout_jiffies = msecs_to_jiffies(A3700_SPI_TIMEOUT); + timeout = wait_for_completion_timeout(&a3700_spi->done, + timeout_jiffies); + + a3700_spi->wait_mask = 0; + + if (timeout) + return true; + + /* there might be the case that right after we checked the + * status bits in this routine and before start to wait for + * interrupt by wait_for_completion_timeout, the interrupt + * happens, to avoid missing it we need to double check + * status bits in control reg, if it is already 1, then + * consider that we have the interrupt successfully and + * return true. + */ + ctrl_reg = spireg_read(a3700_spi, A3700_SPI_IF_CTRL_REG); + if (a3700_spi->wait_mask & ctrl_reg) + return true; + + spireg_write(a3700_spi, A3700_SPI_INT_MASK_REG, 0); + + /* Timeout was reached */ + return false; +} + +static bool a3700_spi_transfer_wait(struct spi_device *spi, + unsigned int bit_mask) +{ + struct a3700_spi *a3700_spi; + + a3700_spi = spi_master_get_devdata(spi->master); + a3700_spi->wait_mask = bit_mask; + + return a3700_spi_wait_completion(spi); +} + +static void a3700_spi_fifo_thres_set(struct a3700_spi *a3700_spi, + unsigned int bytes) +{ + u32 val; + + val = spireg_read(a3700_spi, A3700_SPI_IF_CFG_REG); + val &= ~(A3700_SPI_FIFO_THRS_MASK << A3700_SPI_RFIFO_THRS_BIT); + val |= (bytes - 1) << A3700_SPI_RFIFO_THRS_BIT; + val &= ~(A3700_SPI_FIFO_THRS_MASK << A3700_SPI_WFIFO_THRS_BIT); + val |= (7 - bytes) << A3700_SPI_WFIFO_THRS_BIT; + spireg_write(a3700_spi, A3700_SPI_IF_CFG_REG, val); +} + +static void a3700_spi_transfer_setup(struct spi_device *spi, + struct spi_transfer *xfer) +{ + struct a3700_spi *a3700_spi; + + a3700_spi = spi_master_get_devdata(spi->master); + + a3700_spi_clock_set(a3700_spi, xfer->speed_hz); + + /* Use 4 bytes long transfers. Each transfer method has its way to deal + * with the remaining bytes for non 4-bytes aligned transfers. + */ + a3700_spi_bytelen_set(a3700_spi, 4); + + /* Initialize the working buffers */ + a3700_spi->tx_buf = xfer->tx_buf; + a3700_spi->rx_buf = xfer->rx_buf; + a3700_spi->buf_len = xfer->len; +} + +static void a3700_spi_set_cs(struct spi_device *spi, bool enable) +{ + struct a3700_spi *a3700_spi = spi_master_get_devdata(spi->master); + + if (!enable) + a3700_spi_activate_cs(a3700_spi, spi->chip_select); + else + a3700_spi_deactivate_cs(a3700_spi, spi->chip_select); +} + +static void a3700_spi_header_set(struct a3700_spi *a3700_spi) +{ + unsigned int addr_cnt; + u32 val = 0; + + /* Clear the header registers */ + spireg_write(a3700_spi, A3700_SPI_IF_INST_REG, 0); + spireg_write(a3700_spi, A3700_SPI_IF_ADDR_REG, 0); + spireg_write(a3700_spi, A3700_SPI_IF_RMODE_REG, 0); + spireg_write(a3700_spi, A3700_SPI_IF_HDR_CNT_REG, 0); + + /* Set header counters */ + if (a3700_spi->tx_buf) { + /* + * when tx data is not 4 bytes aligned, there will be unexpected + * bytes out of SPI output register, since it always shifts out + * as whole 4 bytes. This might cause incorrect transaction with + * some devices. To avoid that, use SPI header count feature to + * transfer up to 3 bytes of data first, and then make the rest + * of data 4-byte aligned. + */ + addr_cnt = a3700_spi->buf_len % 4; + if (addr_cnt) { + val = (addr_cnt & A3700_SPI_ADDR_CNT_MASK) + << A3700_SPI_ADDR_CNT_BIT; + spireg_write(a3700_spi, A3700_SPI_IF_HDR_CNT_REG, val); + + /* Update the buffer length to be transferred */ + a3700_spi->buf_len -= addr_cnt; + + /* transfer 1~3 bytes through address count */ + val = 0; + while (addr_cnt--) { + val = (val << 8) | a3700_spi->tx_buf[0]; + a3700_spi->tx_buf++; + } + spireg_write(a3700_spi, A3700_SPI_IF_ADDR_REG, val); + } + } +} + +static int a3700_is_wfifo_full(struct a3700_spi *a3700_spi) +{ + u32 val; + + val = spireg_read(a3700_spi, A3700_SPI_IF_CTRL_REG); + return (val & A3700_SPI_WFIFO_FULL); +} + +static int a3700_spi_fifo_write(struct a3700_spi *a3700_spi) +{ + u32 val; + + while (!a3700_is_wfifo_full(a3700_spi) && a3700_spi->buf_len) { + val = *(u32 *)a3700_spi->tx_buf; + spireg_write(a3700_spi, A3700_SPI_DATA_OUT_REG, val); + a3700_spi->buf_len -= 4; + a3700_spi->tx_buf += 4; + } + + return 0; +} + +static int a3700_is_rfifo_empty(struct a3700_spi *a3700_spi) +{ + u32 val = spireg_read(a3700_spi, A3700_SPI_IF_CTRL_REG); + + return (val & A3700_SPI_RFIFO_EMPTY); +} + +static int a3700_spi_fifo_read(struct a3700_spi *a3700_spi) +{ + u32 val; + + while (!a3700_is_rfifo_empty(a3700_spi) && a3700_spi->buf_len) { + val = spireg_read(a3700_spi, A3700_SPI_DATA_IN_REG); + if (a3700_spi->buf_len >= 4) { + + memcpy(a3700_spi->rx_buf, &val, 4); + + a3700_spi->buf_len -= 4; + a3700_spi->rx_buf += 4; + } else { + /* + * When remain bytes is not larger than 4, we should + * avoid memory overwriting and just write the left rx + * buffer bytes. + */ + while (a3700_spi->buf_len) { + *a3700_spi->rx_buf = val & 0xff; + val >>= 8; + + a3700_spi->buf_len--; + a3700_spi->rx_buf++; + } + } + } + + return 0; +} + +static void a3700_spi_transfer_abort_fifo(struct a3700_spi *a3700_spi) +{ + int timeout = A3700_SPI_TIMEOUT; + u32 val; + + val = spireg_read(a3700_spi, A3700_SPI_IF_CFG_REG); + val |= A3700_SPI_XFER_STOP; + spireg_write(a3700_spi, A3700_SPI_IF_CFG_REG, val); + + while (--timeout) { + val = spireg_read(a3700_spi, A3700_SPI_IF_CFG_REG); + if (!(val & A3700_SPI_XFER_START)) + break; + udelay(1); + } + + a3700_spi_fifo_flush(a3700_spi); + + val &= ~A3700_SPI_XFER_STOP; + spireg_write(a3700_spi, A3700_SPI_IF_CFG_REG, val); +} + +static int a3700_spi_prepare_message(struct spi_master *master, + struct spi_message *message) +{ + struct a3700_spi *a3700_spi = spi_master_get_devdata(master); + struct spi_device *spi = message->spi; + int ret; + + ret = clk_enable(a3700_spi->clk); + if (ret) { + dev_err(&spi->dev, "failed to enable clk with error %d\n", ret); + return ret; + } + + /* Flush the FIFOs */ + ret = a3700_spi_fifo_flush(a3700_spi); + if (ret) + return ret; + + a3700_spi_mode_set(a3700_spi, spi->mode); + + return 0; +} + +static int a3700_spi_transfer_one_fifo(struct spi_master *master, + struct spi_device *spi, + struct spi_transfer *xfer) +{ + struct a3700_spi *a3700_spi = spi_master_get_devdata(master); + int ret = 0, timeout = A3700_SPI_TIMEOUT; + unsigned int nbits = 0, byte_len; + u32 val; + + /* Make sure we use FIFO mode */ + a3700_spi_fifo_mode_set(a3700_spi, true); + + /* Configure FIFO thresholds */ + byte_len = xfer->bits_per_word >> 3; + a3700_spi_fifo_thres_set(a3700_spi, byte_len); + + if (xfer->tx_buf) + nbits = xfer->tx_nbits; + else if (xfer->rx_buf) + nbits = xfer->rx_nbits; + + a3700_spi_pin_mode_set(a3700_spi, nbits, xfer->rx_buf ? true : false); + + /* Flush the FIFOs */ + a3700_spi_fifo_flush(a3700_spi); + + /* Transfer first bytes of data when buffer is not 4-byte aligned */ + a3700_spi_header_set(a3700_spi); + + if (xfer->rx_buf) { + /* Clear WFIFO, since it's last 2 bytes are shifted out during + * a read operation + */ + spireg_write(a3700_spi, A3700_SPI_DATA_OUT_REG, 0); + + /* Set read data length */ + spireg_write(a3700_spi, A3700_SPI_IF_DIN_CNT_REG, + a3700_spi->buf_len); + /* Start READ transfer */ + val = spireg_read(a3700_spi, A3700_SPI_IF_CFG_REG); + val &= ~A3700_SPI_RW_EN; + val |= A3700_SPI_XFER_START; + spireg_write(a3700_spi, A3700_SPI_IF_CFG_REG, val); + } else if (xfer->tx_buf) { + /* Start Write transfer */ + val = spireg_read(a3700_spi, A3700_SPI_IF_CFG_REG); + val |= (A3700_SPI_XFER_START | A3700_SPI_RW_EN); + spireg_write(a3700_spi, A3700_SPI_IF_CFG_REG, val); + + /* + * If there are data to be written to the SPI device, xmit_data + * flag is set true; otherwise the instruction in SPI_INSTR does + * not require data to be written to the SPI device, then + * xmit_data flag is set false. + */ + a3700_spi->xmit_data = (a3700_spi->buf_len != 0); + } + + while (a3700_spi->buf_len) { + if (a3700_spi->tx_buf) { + /* Wait wfifo ready */ + if (!a3700_spi_transfer_wait(spi, + A3700_SPI_WFIFO_RDY)) { + dev_err(&spi->dev, + "wait wfifo ready timed out\n"); + ret = -ETIMEDOUT; + goto error; + } + /* Fill up the wfifo */ + ret = a3700_spi_fifo_write(a3700_spi); + if (ret) + goto error; + } else if (a3700_spi->rx_buf) { + /* Wait rfifo ready */ + if (!a3700_spi_transfer_wait(spi, + A3700_SPI_RFIFO_RDY)) { + dev_err(&spi->dev, + "wait rfifo ready timed out\n"); + ret = -ETIMEDOUT; + goto error; + } + /* Drain out the rfifo */ + ret = a3700_spi_fifo_read(a3700_spi); + if (ret) + goto error; + } + } + + /* + * Stop a write transfer in fifo mode: + * - wait all the bytes in wfifo to be shifted out + * - set XFER_STOP bit + * - wait XFER_START bit clear + * - clear XFER_STOP bit + * Stop a read transfer in fifo mode: + * - the hardware is to reset the XFER_START bit + * after the number of bytes indicated in DIN_CNT + * register + * - just wait XFER_START bit clear + */ + if (a3700_spi->tx_buf) { + if (a3700_spi->xmit_data) { + /* + * If there are data written to the SPI device, wait + * until SPI_WFIFO_EMPTY is 1 to wait for all data to + * transfer out of write FIFO. + */ + if (!a3700_spi_transfer_wait(spi, + A3700_SPI_WFIFO_EMPTY)) { + dev_err(&spi->dev, "wait wfifo empty timed out\n"); + return -ETIMEDOUT; + } + } + + if (!a3700_spi_transfer_wait(spi, A3700_SPI_XFER_RDY)) { + dev_err(&spi->dev, "wait xfer ready timed out\n"); + return -ETIMEDOUT; + } + + val = spireg_read(a3700_spi, A3700_SPI_IF_CFG_REG); + val |= A3700_SPI_XFER_STOP; + spireg_write(a3700_spi, A3700_SPI_IF_CFG_REG, val); + } + + while (--timeout) { + val = spireg_read(a3700_spi, A3700_SPI_IF_CFG_REG); + if (!(val & A3700_SPI_XFER_START)) + break; + udelay(1); + } + + if (timeout == 0) { + dev_err(&spi->dev, "wait transfer start clear timed out\n"); + ret = -ETIMEDOUT; + goto error; + } + + val &= ~A3700_SPI_XFER_STOP; + spireg_write(a3700_spi, A3700_SPI_IF_CFG_REG, val); + goto out; + +error: + a3700_spi_transfer_abort_fifo(a3700_spi); +out: + spi_finalize_current_transfer(master); + + return ret; +} + +static int a3700_spi_transfer_one_full_duplex(struct spi_master *master, + struct spi_device *spi, + struct spi_transfer *xfer) +{ + struct a3700_spi *a3700_spi = spi_master_get_devdata(master); + u32 val; + + /* Disable FIFO mode */ + a3700_spi_fifo_mode_set(a3700_spi, false); + + while (a3700_spi->buf_len) { + + /* When we have less than 4 bytes to transfer, switch to 1 byte + * mode. This is reset after each transfer + */ + if (a3700_spi->buf_len < 4) + a3700_spi_bytelen_set(a3700_spi, 1); + + if (a3700_spi->byte_len == 1) + val = *a3700_spi->tx_buf; + else + val = *(u32 *)a3700_spi->tx_buf; + + spireg_write(a3700_spi, A3700_SPI_DATA_OUT_REG, val); + + /* Wait for all the data to be shifted in / out */ + while (!(spireg_read(a3700_spi, A3700_SPI_IF_CTRL_REG) & + A3700_SPI_XFER_DONE)) + cpu_relax(); + + val = spireg_read(a3700_spi, A3700_SPI_DATA_IN_REG); + + memcpy(a3700_spi->rx_buf, &val, a3700_spi->byte_len); + + a3700_spi->buf_len -= a3700_spi->byte_len; + a3700_spi->tx_buf += a3700_spi->byte_len; + a3700_spi->rx_buf += a3700_spi->byte_len; + + } + + spi_finalize_current_transfer(master); + + return 0; +} + +static int a3700_spi_transfer_one(struct spi_master *master, + struct spi_device *spi, + struct spi_transfer *xfer) +{ + a3700_spi_transfer_setup(spi, xfer); + + if (xfer->tx_buf && xfer->rx_buf) + return a3700_spi_transfer_one_full_duplex(master, spi, xfer); + + return a3700_spi_transfer_one_fifo(master, spi, xfer); +} + +static int a3700_spi_unprepare_message(struct spi_master *master, + struct spi_message *message) +{ + struct a3700_spi *a3700_spi = spi_master_get_devdata(master); + + clk_disable(a3700_spi->clk); + + return 0; +} + +static const struct of_device_id a3700_spi_dt_ids[] = { + { .compatible = "marvell,armada-3700-spi", .data = NULL }, + {}, +}; + +MODULE_DEVICE_TABLE(of, a3700_spi_dt_ids); + +static int a3700_spi_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct device_node *of_node = dev->of_node; + struct spi_master *master; + struct a3700_spi *spi; + u32 num_cs = 0; + int irq, ret = 0; + + master = spi_alloc_master(dev, sizeof(*spi)); + if (!master) { + dev_err(dev, "master allocation failed\n"); + ret = -ENOMEM; + goto out; + } + + if (of_property_read_u32(of_node, "num-cs", &num_cs)) { + dev_err(dev, "could not find num-cs\n"); + ret = -ENXIO; + goto error; + } + + master->bus_num = pdev->id; + master->dev.of_node = of_node; + master->mode_bits = SPI_MODE_3; + master->num_chipselect = num_cs; + master->bits_per_word_mask = SPI_BPW_MASK(8) | SPI_BPW_MASK(32); + master->prepare_message = a3700_spi_prepare_message; + master->transfer_one = a3700_spi_transfer_one; + master->unprepare_message = a3700_spi_unprepare_message; + master->set_cs = a3700_spi_set_cs; + master->mode_bits |= (SPI_RX_DUAL | SPI_TX_DUAL | + SPI_RX_QUAD | SPI_TX_QUAD); + + platform_set_drvdata(pdev, master); + + spi = spi_master_get_devdata(master); + + spi->master = master; + + spi->base = devm_platform_ioremap_resource(pdev, 0); + if (IS_ERR(spi->base)) { + ret = PTR_ERR(spi->base); + goto error; + } + + irq = platform_get_irq(pdev, 0); + if (irq < 0) { + ret = -ENXIO; + goto error; + } + spi->irq = irq; + + init_completion(&spi->done); + + spi->clk = devm_clk_get(dev, NULL); + if (IS_ERR(spi->clk)) { + dev_err(dev, "could not find clk: %ld\n", PTR_ERR(spi->clk)); + goto error; + } + + ret = clk_prepare(spi->clk); + if (ret) { + dev_err(dev, "could not prepare clk: %d\n", ret); + goto error; + } + + master->max_speed_hz = min_t(unsigned long, A3700_SPI_MAX_SPEED_HZ, + clk_get_rate(spi->clk)); + master->min_speed_hz = DIV_ROUND_UP(clk_get_rate(spi->clk), + A3700_SPI_MAX_PRESCALE); + + a3700_spi_init(spi); + + ret = devm_request_irq(dev, spi->irq, a3700_spi_interrupt, 0, + dev_name(dev), master); + if (ret) { + dev_err(dev, "could not request IRQ: %d\n", ret); + goto error_clk; + } + + ret = devm_spi_register_master(dev, master); + if (ret) { + dev_err(dev, "Failed to register master\n"); + goto error_clk; + } + + return 0; + +error_clk: + clk_unprepare(spi->clk); +error: + spi_master_put(master); +out: + return ret; +} + +static int a3700_spi_remove(struct platform_device *pdev) +{ + struct spi_master *master = platform_get_drvdata(pdev); + struct a3700_spi *spi = spi_master_get_devdata(master); + + clk_unprepare(spi->clk); + + return 0; +} + +static struct platform_driver a3700_spi_driver = { + .driver = { + .name = DRIVER_NAME, + .of_match_table = of_match_ptr(a3700_spi_dt_ids), + }, + .probe = a3700_spi_probe, + .remove = a3700_spi_remove, +}; + +module_platform_driver(a3700_spi_driver); + +MODULE_DESCRIPTION("Armada-3700 SPI driver"); +MODULE_AUTHOR("Wilson Ding <dingwei@marvell.com>"); +MODULE_LICENSE("GPL"); +MODULE_ALIAS("platform:" DRIVER_NAME); diff --git a/drivers/spi/spi-at91-usart.c b/drivers/spi/spi-at91-usart.c new file mode 100644 index 000000000..8c8352625 --- /dev/null +++ b/drivers/spi/spi-at91-usart.c @@ -0,0 +1,698 @@ +// SPDX-License-Identifier: GPL-2.0 +// +// Driver for AT91 USART Controllers as SPI +// +// Copyright (C) 2018 Microchip Technology Inc. +// +// Author: Radu Pirea <radu.pirea@microchip.com> + +#include <linux/clk.h> +#include <linux/delay.h> +#include <linux/dmaengine.h> +#include <linux/dma-direction.h> +#include <linux/interrupt.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/of_platform.h> +#include <linux/of_gpio.h> +#include <linux/pinctrl/consumer.h> +#include <linux/platform_device.h> +#include <linux/pm_runtime.h> + +#include <linux/spi/spi.h> + +#define US_CR 0x00 +#define US_MR 0x04 +#define US_IER 0x08 +#define US_IDR 0x0C +#define US_CSR 0x14 +#define US_RHR 0x18 +#define US_THR 0x1C +#define US_BRGR 0x20 +#define US_VERSION 0xFC + +#define US_CR_RSTRX BIT(2) +#define US_CR_RSTTX BIT(3) +#define US_CR_RXEN BIT(4) +#define US_CR_RXDIS BIT(5) +#define US_CR_TXEN BIT(6) +#define US_CR_TXDIS BIT(7) + +#define US_MR_SPI_MASTER 0x0E +#define US_MR_CHRL GENMASK(7, 6) +#define US_MR_CPHA BIT(8) +#define US_MR_CPOL BIT(16) +#define US_MR_CLKO BIT(18) +#define US_MR_WRDBT BIT(20) +#define US_MR_LOOP BIT(15) + +#define US_IR_RXRDY BIT(0) +#define US_IR_TXRDY BIT(1) +#define US_IR_OVRE BIT(5) + +#define US_BRGR_SIZE BIT(16) + +#define US_MIN_CLK_DIV 0x06 +#define US_MAX_CLK_DIV BIT(16) + +#define US_RESET (US_CR_RSTRX | US_CR_RSTTX) +#define US_DISABLE (US_CR_RXDIS | US_CR_TXDIS) +#define US_ENABLE (US_CR_RXEN | US_CR_TXEN) +#define US_OVRE_RXRDY_IRQS (US_IR_OVRE | US_IR_RXRDY) + +#define US_INIT \ + (US_MR_SPI_MASTER | US_MR_CHRL | US_MR_CLKO | US_MR_WRDBT) +#define US_DMA_MIN_BYTES 16 +#define US_DMA_TIMEOUT (msecs_to_jiffies(1000)) + +/* Register access macros */ +#define at91_usart_spi_readl(port, reg) \ + readl_relaxed((port)->regs + US_##reg) +#define at91_usart_spi_writel(port, reg, value) \ + writel_relaxed((value), (port)->regs + US_##reg) + +#define at91_usart_spi_readb(port, reg) \ + readb_relaxed((port)->regs + US_##reg) +#define at91_usart_spi_writeb(port, reg, value) \ + writeb_relaxed((value), (port)->regs + US_##reg) + +struct at91_usart_spi { + struct platform_device *mpdev; + struct spi_transfer *current_transfer; + void __iomem *regs; + struct device *dev; + struct clk *clk; + + struct completion xfer_completion; + + /*used in interrupt to protect data reading*/ + spinlock_t lock; + + phys_addr_t phybase; + + int irq; + unsigned int current_tx_remaining_bytes; + unsigned int current_rx_remaining_bytes; + + u32 spi_clk; + u32 status; + + bool xfer_failed; + bool use_dma; +}; + +static void dma_callback(void *data) +{ + struct spi_controller *ctlr = data; + struct at91_usart_spi *aus = spi_master_get_devdata(ctlr); + + at91_usart_spi_writel(aus, IER, US_IR_RXRDY); + aus->current_rx_remaining_bytes = 0; + complete(&aus->xfer_completion); +} + +static bool at91_usart_spi_can_dma(struct spi_controller *ctrl, + struct spi_device *spi, + struct spi_transfer *xfer) +{ + struct at91_usart_spi *aus = spi_master_get_devdata(ctrl); + + return aus->use_dma && xfer->len >= US_DMA_MIN_BYTES; +} + +static int at91_usart_spi_configure_dma(struct spi_controller *ctlr, + struct at91_usart_spi *aus) +{ + struct dma_slave_config slave_config; + struct device *dev = &aus->mpdev->dev; + phys_addr_t phybase = aus->phybase; + dma_cap_mask_t mask; + int err = 0; + + dma_cap_zero(mask); + dma_cap_set(DMA_SLAVE, mask); + + ctlr->dma_tx = dma_request_chan(dev, "tx"); + if (IS_ERR_OR_NULL(ctlr->dma_tx)) { + if (IS_ERR(ctlr->dma_tx)) { + err = PTR_ERR(ctlr->dma_tx); + goto at91_usart_spi_error_clear; + } + + dev_dbg(dev, + "DMA TX channel not available, SPI unable to use DMA\n"); + err = -EBUSY; + goto at91_usart_spi_error_clear; + } + + ctlr->dma_rx = dma_request_chan(dev, "rx"); + if (IS_ERR_OR_NULL(ctlr->dma_rx)) { + if (IS_ERR(ctlr->dma_rx)) { + err = PTR_ERR(ctlr->dma_rx); + goto at91_usart_spi_error; + } + + dev_dbg(dev, + "DMA RX channel not available, SPI unable to use DMA\n"); + err = -EBUSY; + goto at91_usart_spi_error; + } + + slave_config.dst_addr_width = DMA_SLAVE_BUSWIDTH_1_BYTE; + slave_config.src_addr_width = DMA_SLAVE_BUSWIDTH_1_BYTE; + slave_config.dst_addr = (dma_addr_t)phybase + US_THR; + slave_config.src_addr = (dma_addr_t)phybase + US_RHR; + slave_config.src_maxburst = 1; + slave_config.dst_maxburst = 1; + slave_config.device_fc = false; + + slave_config.direction = DMA_DEV_TO_MEM; + if (dmaengine_slave_config(ctlr->dma_rx, &slave_config)) { + dev_err(&ctlr->dev, + "failed to configure rx dma channel\n"); + err = -EINVAL; + goto at91_usart_spi_error; + } + + slave_config.direction = DMA_MEM_TO_DEV; + if (dmaengine_slave_config(ctlr->dma_tx, &slave_config)) { + dev_err(&ctlr->dev, + "failed to configure tx dma channel\n"); + err = -EINVAL; + goto at91_usart_spi_error; + } + + aus->use_dma = true; + return 0; + +at91_usart_spi_error: + if (!IS_ERR_OR_NULL(ctlr->dma_tx)) + dma_release_channel(ctlr->dma_tx); + if (!IS_ERR_OR_NULL(ctlr->dma_rx)) + dma_release_channel(ctlr->dma_rx); + ctlr->dma_tx = NULL; + ctlr->dma_rx = NULL; + +at91_usart_spi_error_clear: + return err; +} + +static void at91_usart_spi_release_dma(struct spi_controller *ctlr) +{ + if (ctlr->dma_rx) + dma_release_channel(ctlr->dma_rx); + if (ctlr->dma_tx) + dma_release_channel(ctlr->dma_tx); +} + +static void at91_usart_spi_stop_dma(struct spi_controller *ctlr) +{ + if (ctlr->dma_rx) + dmaengine_terminate_all(ctlr->dma_rx); + if (ctlr->dma_tx) + dmaengine_terminate_all(ctlr->dma_tx); +} + +static int at91_usart_spi_dma_transfer(struct spi_controller *ctlr, + struct spi_transfer *xfer) +{ + struct at91_usart_spi *aus = spi_master_get_devdata(ctlr); + struct dma_chan *rxchan = ctlr->dma_rx; + struct dma_chan *txchan = ctlr->dma_tx; + struct dma_async_tx_descriptor *rxdesc; + struct dma_async_tx_descriptor *txdesc; + dma_cookie_t cookie; + + /* Disable RX interrupt */ + at91_usart_spi_writel(aus, IDR, US_IR_RXRDY); + + rxdesc = dmaengine_prep_slave_sg(rxchan, + xfer->rx_sg.sgl, + xfer->rx_sg.nents, + DMA_DEV_TO_MEM, + DMA_PREP_INTERRUPT | + DMA_CTRL_ACK); + if (!rxdesc) + goto at91_usart_spi_err_dma; + + txdesc = dmaengine_prep_slave_sg(txchan, + xfer->tx_sg.sgl, + xfer->tx_sg.nents, + DMA_MEM_TO_DEV, + DMA_PREP_INTERRUPT | + DMA_CTRL_ACK); + if (!txdesc) + goto at91_usart_spi_err_dma; + + rxdesc->callback = dma_callback; + rxdesc->callback_param = ctlr; + + cookie = rxdesc->tx_submit(rxdesc); + if (dma_submit_error(cookie)) + goto at91_usart_spi_err_dma; + + cookie = txdesc->tx_submit(txdesc); + if (dma_submit_error(cookie)) + goto at91_usart_spi_err_dma; + + rxchan->device->device_issue_pending(rxchan); + txchan->device->device_issue_pending(txchan); + + return 0; + +at91_usart_spi_err_dma: + /* Enable RX interrupt if something fails and fallback to PIO */ + at91_usart_spi_writel(aus, IER, US_IR_RXRDY); + at91_usart_spi_stop_dma(ctlr); + + return -ENOMEM; +} + +static unsigned long at91_usart_spi_dma_timeout(struct at91_usart_spi *aus) +{ + return wait_for_completion_timeout(&aus->xfer_completion, + US_DMA_TIMEOUT); +} + +static inline u32 at91_usart_spi_tx_ready(struct at91_usart_spi *aus) +{ + return aus->status & US_IR_TXRDY; +} + +static inline u32 at91_usart_spi_rx_ready(struct at91_usart_spi *aus) +{ + return aus->status & US_IR_RXRDY; +} + +static inline u32 at91_usart_spi_check_overrun(struct at91_usart_spi *aus) +{ + return aus->status & US_IR_OVRE; +} + +static inline u32 at91_usart_spi_read_status(struct at91_usart_spi *aus) +{ + aus->status = at91_usart_spi_readl(aus, CSR); + return aus->status; +} + +static inline void at91_usart_spi_tx(struct at91_usart_spi *aus) +{ + unsigned int len = aus->current_transfer->len; + unsigned int remaining = aus->current_tx_remaining_bytes; + const u8 *tx_buf = aus->current_transfer->tx_buf; + + if (!remaining) + return; + + if (at91_usart_spi_tx_ready(aus)) { + at91_usart_spi_writeb(aus, THR, tx_buf[len - remaining]); + aus->current_tx_remaining_bytes--; + } +} + +static inline void at91_usart_spi_rx(struct at91_usart_spi *aus) +{ + int len = aus->current_transfer->len; + int remaining = aus->current_rx_remaining_bytes; + u8 *rx_buf = aus->current_transfer->rx_buf; + + if (!remaining) + return; + + rx_buf[len - remaining] = at91_usart_spi_readb(aus, RHR); + aus->current_rx_remaining_bytes--; +} + +static inline void +at91_usart_spi_set_xfer_speed(struct at91_usart_spi *aus, + struct spi_transfer *xfer) +{ + at91_usart_spi_writel(aus, BRGR, + DIV_ROUND_UP(aus->spi_clk, xfer->speed_hz)); +} + +static irqreturn_t at91_usart_spi_interrupt(int irq, void *dev_id) +{ + struct spi_controller *controller = dev_id; + struct at91_usart_spi *aus = spi_master_get_devdata(controller); + + spin_lock(&aus->lock); + at91_usart_spi_read_status(aus); + + if (at91_usart_spi_check_overrun(aus)) { + aus->xfer_failed = true; + at91_usart_spi_writel(aus, IDR, US_IR_OVRE | US_IR_RXRDY); + spin_unlock(&aus->lock); + return IRQ_HANDLED; + } + + if (at91_usart_spi_rx_ready(aus)) { + at91_usart_spi_rx(aus); + spin_unlock(&aus->lock); + return IRQ_HANDLED; + } + + spin_unlock(&aus->lock); + + return IRQ_NONE; +} + +static int at91_usart_spi_setup(struct spi_device *spi) +{ + struct at91_usart_spi *aus = spi_master_get_devdata(spi->controller); + u32 *ausd = spi->controller_state; + unsigned int mr = at91_usart_spi_readl(aus, MR); + + if (spi->mode & SPI_CPOL) + mr |= US_MR_CPOL; + else + mr &= ~US_MR_CPOL; + + if (spi->mode & SPI_CPHA) + mr |= US_MR_CPHA; + else + mr &= ~US_MR_CPHA; + + if (spi->mode & SPI_LOOP) + mr |= US_MR_LOOP; + else + mr &= ~US_MR_LOOP; + + if (!ausd) { + ausd = kzalloc(sizeof(*ausd), GFP_KERNEL); + if (!ausd) + return -ENOMEM; + + spi->controller_state = ausd; + } + + *ausd = mr; + + dev_dbg(&spi->dev, + "setup: bpw %u mode 0x%x -> mr %d %08x\n", + spi->bits_per_word, spi->mode, spi->chip_select, mr); + + return 0; +} + +static int at91_usart_spi_transfer_one(struct spi_controller *ctlr, + struct spi_device *spi, + struct spi_transfer *xfer) +{ + struct at91_usart_spi *aus = spi_master_get_devdata(ctlr); + unsigned long dma_timeout = 0; + int ret = 0; + + at91_usart_spi_set_xfer_speed(aus, xfer); + aus->xfer_failed = false; + aus->current_transfer = xfer; + aus->current_tx_remaining_bytes = xfer->len; + aus->current_rx_remaining_bytes = xfer->len; + + while ((aus->current_tx_remaining_bytes || + aus->current_rx_remaining_bytes) && !aus->xfer_failed) { + reinit_completion(&aus->xfer_completion); + if (at91_usart_spi_can_dma(ctlr, spi, xfer) && + !ret) { + ret = at91_usart_spi_dma_transfer(ctlr, xfer); + if (ret) + continue; + + dma_timeout = at91_usart_spi_dma_timeout(aus); + + if (WARN_ON(dma_timeout == 0)) { + dev_err(&spi->dev, "DMA transfer timeout\n"); + return -EIO; + } + aus->current_tx_remaining_bytes = 0; + } else { + at91_usart_spi_read_status(aus); + at91_usart_spi_tx(aus); + } + + cpu_relax(); + } + + if (aus->xfer_failed) { + dev_err(aus->dev, "Overrun!\n"); + return -EIO; + } + + return 0; +} + +static int at91_usart_spi_prepare_message(struct spi_controller *ctlr, + struct spi_message *message) +{ + struct at91_usart_spi *aus = spi_master_get_devdata(ctlr); + struct spi_device *spi = message->spi; + u32 *ausd = spi->controller_state; + + at91_usart_spi_writel(aus, CR, US_ENABLE); + at91_usart_spi_writel(aus, IER, US_OVRE_RXRDY_IRQS); + at91_usart_spi_writel(aus, MR, *ausd); + + return 0; +} + +static int at91_usart_spi_unprepare_message(struct spi_controller *ctlr, + struct spi_message *message) +{ + struct at91_usart_spi *aus = spi_master_get_devdata(ctlr); + + at91_usart_spi_writel(aus, CR, US_RESET | US_DISABLE); + at91_usart_spi_writel(aus, IDR, US_OVRE_RXRDY_IRQS); + + return 0; +} + +static void at91_usart_spi_cleanup(struct spi_device *spi) +{ + struct at91_usart_spi_device *ausd = spi->controller_state; + + spi->controller_state = NULL; + kfree(ausd); +} + +static void at91_usart_spi_init(struct at91_usart_spi *aus) +{ + at91_usart_spi_writel(aus, MR, US_INIT); + at91_usart_spi_writel(aus, CR, US_RESET | US_DISABLE); +} + +static int at91_usart_gpio_setup(struct platform_device *pdev) +{ + struct device_node *np = pdev->dev.parent->of_node; + int i; + int ret; + int nb; + + if (!np) + return -EINVAL; + + nb = of_gpio_named_count(np, "cs-gpios"); + for (i = 0; i < nb; i++) { + int cs_gpio = of_get_named_gpio(np, "cs-gpios", i); + + if (cs_gpio < 0) + return cs_gpio; + + if (gpio_is_valid(cs_gpio)) { + ret = devm_gpio_request_one(&pdev->dev, cs_gpio, + GPIOF_DIR_OUT, + dev_name(&pdev->dev)); + if (ret) + return ret; + } + } + + return 0; +} + +static int at91_usart_spi_probe(struct platform_device *pdev) +{ + struct resource *regs; + struct spi_controller *controller; + struct at91_usart_spi *aus; + struct clk *clk; + int irq; + int ret; + + regs = platform_get_resource(to_platform_device(pdev->dev.parent), + IORESOURCE_MEM, 0); + if (!regs) + return -EINVAL; + + irq = platform_get_irq(to_platform_device(pdev->dev.parent), 0); + if (irq < 0) + return irq; + + clk = devm_clk_get(pdev->dev.parent, "usart"); + if (IS_ERR(clk)) + return PTR_ERR(clk); + + ret = -ENOMEM; + controller = spi_alloc_master(&pdev->dev, sizeof(*aus)); + if (!controller) + goto at91_usart_spi_probe_fail; + + ret = at91_usart_gpio_setup(pdev); + if (ret) + goto at91_usart_spi_probe_fail; + + controller->mode_bits = SPI_CPOL | SPI_CPHA | SPI_LOOP | SPI_CS_HIGH; + controller->dev.of_node = pdev->dev.parent->of_node; + controller->bits_per_word_mask = SPI_BPW_MASK(8); + controller->setup = at91_usart_spi_setup; + controller->flags = SPI_MASTER_MUST_RX | SPI_MASTER_MUST_TX; + controller->transfer_one = at91_usart_spi_transfer_one; + controller->prepare_message = at91_usart_spi_prepare_message; + controller->unprepare_message = at91_usart_spi_unprepare_message; + controller->can_dma = at91_usart_spi_can_dma; + controller->cleanup = at91_usart_spi_cleanup; + controller->max_speed_hz = DIV_ROUND_UP(clk_get_rate(clk), + US_MIN_CLK_DIV); + controller->min_speed_hz = DIV_ROUND_UP(clk_get_rate(clk), + US_MAX_CLK_DIV); + platform_set_drvdata(pdev, controller); + + aus = spi_master_get_devdata(controller); + + aus->dev = &pdev->dev; + aus->regs = devm_ioremap_resource(&pdev->dev, regs); + if (IS_ERR(aus->regs)) { + ret = PTR_ERR(aus->regs); + goto at91_usart_spi_probe_fail; + } + + aus->irq = irq; + aus->clk = clk; + + ret = devm_request_irq(&pdev->dev, irq, at91_usart_spi_interrupt, 0, + dev_name(&pdev->dev), controller); + if (ret) + goto at91_usart_spi_probe_fail; + + ret = clk_prepare_enable(clk); + if (ret) + goto at91_usart_spi_probe_fail; + + aus->spi_clk = clk_get_rate(clk); + at91_usart_spi_init(aus); + + aus->phybase = regs->start; + + aus->mpdev = to_platform_device(pdev->dev.parent); + + ret = at91_usart_spi_configure_dma(controller, aus); + if (ret) + goto at91_usart_fail_dma; + + spin_lock_init(&aus->lock); + init_completion(&aus->xfer_completion); + + ret = devm_spi_register_master(&pdev->dev, controller); + if (ret) + goto at91_usart_fail_register_master; + + dev_info(&pdev->dev, + "AT91 USART SPI Controller version 0x%x at %pa (irq %d)\n", + at91_usart_spi_readl(aus, VERSION), + ®s->start, irq); + + return 0; + +at91_usart_fail_register_master: + at91_usart_spi_release_dma(controller); +at91_usart_fail_dma: + clk_disable_unprepare(clk); +at91_usart_spi_probe_fail: + spi_master_put(controller); + return ret; +} + +__maybe_unused static int at91_usart_spi_runtime_suspend(struct device *dev) +{ + struct spi_controller *ctlr = dev_get_drvdata(dev); + struct at91_usart_spi *aus = spi_master_get_devdata(ctlr); + + clk_disable_unprepare(aus->clk); + pinctrl_pm_select_sleep_state(dev); + + return 0; +} + +__maybe_unused static int at91_usart_spi_runtime_resume(struct device *dev) +{ + struct spi_controller *ctrl = dev_get_drvdata(dev); + struct at91_usart_spi *aus = spi_master_get_devdata(ctrl); + + pinctrl_pm_select_default_state(dev); + + return clk_prepare_enable(aus->clk); +} + +__maybe_unused static int at91_usart_spi_suspend(struct device *dev) +{ + struct spi_controller *ctrl = dev_get_drvdata(dev); + int ret; + + ret = spi_controller_suspend(ctrl); + if (ret) + return ret; + + if (!pm_runtime_suspended(dev)) + at91_usart_spi_runtime_suspend(dev); + + return 0; +} + +__maybe_unused static int at91_usart_spi_resume(struct device *dev) +{ + struct spi_controller *ctrl = dev_get_drvdata(dev); + struct at91_usart_spi *aus = spi_master_get_devdata(ctrl); + int ret; + + if (!pm_runtime_suspended(dev)) { + ret = at91_usart_spi_runtime_resume(dev); + if (ret) + return ret; + } + + at91_usart_spi_init(aus); + + return spi_controller_resume(ctrl); +} + +static int at91_usart_spi_remove(struct platform_device *pdev) +{ + struct spi_controller *ctlr = platform_get_drvdata(pdev); + struct at91_usart_spi *aus = spi_master_get_devdata(ctlr); + + at91_usart_spi_release_dma(ctlr); + clk_disable_unprepare(aus->clk); + + return 0; +} + +static const struct dev_pm_ops at91_usart_spi_pm_ops = { + SET_SYSTEM_SLEEP_PM_OPS(at91_usart_spi_suspend, at91_usart_spi_resume) + SET_RUNTIME_PM_OPS(at91_usart_spi_runtime_suspend, + at91_usart_spi_runtime_resume, NULL) +}; + +static struct platform_driver at91_usart_spi_driver = { + .driver = { + .name = "at91_usart_spi", + .pm = &at91_usart_spi_pm_ops, + }, + .probe = at91_usart_spi_probe, + .remove = at91_usart_spi_remove, +}; + +module_platform_driver(at91_usart_spi_driver); + +MODULE_DESCRIPTION("Microchip AT91 USART SPI Controller driver"); +MODULE_AUTHOR("Radu Pirea <radu.pirea@microchip.com>"); +MODULE_LICENSE("GPL v2"); +MODULE_ALIAS("platform:at91_usart_spi"); diff --git a/drivers/spi/spi-ath79.c b/drivers/spi/spi-ath79.c new file mode 100644 index 000000000..98ace748c --- /dev/null +++ b/drivers/spi/spi-ath79.c @@ -0,0 +1,250 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * SPI controller driver for the Atheros AR71XX/AR724X/AR913X SoCs + * + * Copyright (C) 2009-2011 Gabor Juhos <juhosg@openwrt.org> + * + * This driver has been based on the spi-gpio.c: + * Copyright (C) 2006,2008 David Brownell + */ + +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/delay.h> +#include <linux/spinlock.h> +#include <linux/platform_device.h> +#include <linux/io.h> +#include <linux/spi/spi.h> +#include <linux/spi/spi_bitbang.h> +#include <linux/bitops.h> +#include <linux/clk.h> +#include <linux/err.h> +#include <linux/platform_data/spi-ath79.h> + +#define DRV_NAME "ath79-spi" + +#define ATH79_SPI_RRW_DELAY_FACTOR 12000 +#define MHZ (1000 * 1000) + +#define AR71XX_SPI_REG_FS 0x00 /* Function Select */ +#define AR71XX_SPI_REG_CTRL 0x04 /* SPI Control */ +#define AR71XX_SPI_REG_IOC 0x08 /* SPI I/O Control */ +#define AR71XX_SPI_REG_RDS 0x0c /* Read Data Shift */ + +#define AR71XX_SPI_FS_GPIO BIT(0) /* Enable GPIO mode */ + +#define AR71XX_SPI_IOC_DO BIT(0) /* Data Out pin */ +#define AR71XX_SPI_IOC_CLK BIT(8) /* CLK pin */ +#define AR71XX_SPI_IOC_CS(n) BIT(16 + (n)) + +struct ath79_spi { + struct spi_bitbang bitbang; + u32 ioc_base; + u32 reg_ctrl; + void __iomem *base; + struct clk *clk; + unsigned int rrw_delay; +}; + +static inline u32 ath79_spi_rr(struct ath79_spi *sp, unsigned int reg) +{ + return ioread32(sp->base + reg); +} + +static inline void ath79_spi_wr(struct ath79_spi *sp, unsigned int reg, u32 val) +{ + iowrite32(val, sp->base + reg); +} + +static inline struct ath79_spi *ath79_spidev_to_sp(struct spi_device *spi) +{ + return spi_master_get_devdata(spi->master); +} + +static inline void ath79_spi_delay(struct ath79_spi *sp, unsigned int nsecs) +{ + if (nsecs > sp->rrw_delay) + ndelay(nsecs - sp->rrw_delay); +} + +static void ath79_spi_chipselect(struct spi_device *spi, int is_active) +{ + struct ath79_spi *sp = ath79_spidev_to_sp(spi); + int cs_high = (spi->mode & SPI_CS_HIGH) ? is_active : !is_active; + u32 cs_bit = AR71XX_SPI_IOC_CS(spi->chip_select); + + if (cs_high) + sp->ioc_base |= cs_bit; + else + sp->ioc_base &= ~cs_bit; + + ath79_spi_wr(sp, AR71XX_SPI_REG_IOC, sp->ioc_base); +} + +static void ath79_spi_enable(struct ath79_spi *sp) +{ + /* enable GPIO mode */ + ath79_spi_wr(sp, AR71XX_SPI_REG_FS, AR71XX_SPI_FS_GPIO); + + /* save CTRL register */ + sp->reg_ctrl = ath79_spi_rr(sp, AR71XX_SPI_REG_CTRL); + sp->ioc_base = ath79_spi_rr(sp, AR71XX_SPI_REG_IOC); + + /* clear clk and mosi in the base state */ + sp->ioc_base &= ~(AR71XX_SPI_IOC_DO | AR71XX_SPI_IOC_CLK); + + /* TODO: setup speed? */ + ath79_spi_wr(sp, AR71XX_SPI_REG_CTRL, 0x43); +} + +static void ath79_spi_disable(struct ath79_spi *sp) +{ + /* restore CTRL register */ + ath79_spi_wr(sp, AR71XX_SPI_REG_CTRL, sp->reg_ctrl); + /* disable GPIO mode */ + ath79_spi_wr(sp, AR71XX_SPI_REG_FS, 0); +} + +static u32 ath79_spi_txrx_mode0(struct spi_device *spi, unsigned int nsecs, + u32 word, u8 bits, unsigned flags) +{ + struct ath79_spi *sp = ath79_spidev_to_sp(spi); + u32 ioc = sp->ioc_base; + + /* clock starts at inactive polarity */ + for (word <<= (32 - bits); likely(bits); bits--) { + u32 out; + + if (word & (1 << 31)) + out = ioc | AR71XX_SPI_IOC_DO; + else + out = ioc & ~AR71XX_SPI_IOC_DO; + + /* setup MSB (to slave) on trailing edge */ + ath79_spi_wr(sp, AR71XX_SPI_REG_IOC, out); + ath79_spi_delay(sp, nsecs); + ath79_spi_wr(sp, AR71XX_SPI_REG_IOC, out | AR71XX_SPI_IOC_CLK); + ath79_spi_delay(sp, nsecs); + if (bits == 1) + ath79_spi_wr(sp, AR71XX_SPI_REG_IOC, out); + + word <<= 1; + } + + return ath79_spi_rr(sp, AR71XX_SPI_REG_RDS); +} + +static int ath79_spi_probe(struct platform_device *pdev) +{ + struct spi_master *master; + struct ath79_spi *sp; + struct ath79_spi_platform_data *pdata; + unsigned long rate; + int ret; + + master = spi_alloc_master(&pdev->dev, sizeof(*sp)); + if (master == NULL) { + dev_err(&pdev->dev, "failed to allocate spi master\n"); + return -ENOMEM; + } + + sp = spi_master_get_devdata(master); + master->dev.of_node = pdev->dev.of_node; + platform_set_drvdata(pdev, sp); + + pdata = dev_get_platdata(&pdev->dev); + + master->use_gpio_descriptors = true; + master->bits_per_word_mask = SPI_BPW_RANGE_MASK(1, 32); + master->flags = SPI_MASTER_GPIO_SS; + if (pdata) { + master->bus_num = pdata->bus_num; + master->num_chipselect = pdata->num_chipselect; + } + + sp->bitbang.master = master; + sp->bitbang.chipselect = ath79_spi_chipselect; + sp->bitbang.txrx_word[SPI_MODE_0] = ath79_spi_txrx_mode0; + sp->bitbang.flags = SPI_CS_HIGH; + + sp->base = devm_platform_ioremap_resource(pdev, 0); + if (IS_ERR(sp->base)) { + ret = PTR_ERR(sp->base); + goto err_put_master; + } + + sp->clk = devm_clk_get(&pdev->dev, "ahb"); + if (IS_ERR(sp->clk)) { + ret = PTR_ERR(sp->clk); + goto err_put_master; + } + + ret = clk_prepare_enable(sp->clk); + if (ret) + goto err_put_master; + + rate = DIV_ROUND_UP(clk_get_rate(sp->clk), MHZ); + if (!rate) { + ret = -EINVAL; + goto err_clk_disable; + } + + sp->rrw_delay = ATH79_SPI_RRW_DELAY_FACTOR / rate; + dev_dbg(&pdev->dev, "register read/write delay is %u nsecs\n", + sp->rrw_delay); + + ath79_spi_enable(sp); + ret = spi_bitbang_start(&sp->bitbang); + if (ret) + goto err_disable; + + return 0; + +err_disable: + ath79_spi_disable(sp); +err_clk_disable: + clk_disable_unprepare(sp->clk); +err_put_master: + spi_master_put(sp->bitbang.master); + + return ret; +} + +static int ath79_spi_remove(struct platform_device *pdev) +{ + struct ath79_spi *sp = platform_get_drvdata(pdev); + + spi_bitbang_stop(&sp->bitbang); + ath79_spi_disable(sp); + clk_disable_unprepare(sp->clk); + spi_master_put(sp->bitbang.master); + + return 0; +} + +static void ath79_spi_shutdown(struct platform_device *pdev) +{ + ath79_spi_remove(pdev); +} + +static const struct of_device_id ath79_spi_of_match[] = { + { .compatible = "qca,ar7100-spi", }, + { }, +}; +MODULE_DEVICE_TABLE(of, ath79_spi_of_match); + +static struct platform_driver ath79_spi_driver = { + .probe = ath79_spi_probe, + .remove = ath79_spi_remove, + .shutdown = ath79_spi_shutdown, + .driver = { + .name = DRV_NAME, + .of_match_table = ath79_spi_of_match, + }, +}; +module_platform_driver(ath79_spi_driver); + +MODULE_DESCRIPTION("SPI controller driver for Atheros AR71XX/AR724X/AR913X"); +MODULE_AUTHOR("Gabor Juhos <juhosg@openwrt.org>"); +MODULE_LICENSE("GPL v2"); +MODULE_ALIAS("platform:" DRV_NAME); diff --git a/drivers/spi/spi-atmel.c b/drivers/spi/spi-atmel.c new file mode 100644 index 000000000..26fa3f826 --- /dev/null +++ b/drivers/spi/spi-atmel.c @@ -0,0 +1,1750 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Driver for Atmel AT32 and AT91 SPI Controllers + * + * Copyright (C) 2006 Atmel Corporation + */ + +#include <linux/kernel.h> +#include <linux/clk.h> +#include <linux/module.h> +#include <linux/platform_device.h> +#include <linux/delay.h> +#include <linux/dma-mapping.h> +#include <linux/dmaengine.h> +#include <linux/err.h> +#include <linux/interrupt.h> +#include <linux/spi/spi.h> +#include <linux/slab.h> +#include <linux/of.h> + +#include <linux/io.h> +#include <linux/gpio/consumer.h> +#include <linux/pinctrl/consumer.h> +#include <linux/pm_runtime.h> +#include <trace/events/spi.h> + +/* SPI register offsets */ +#define SPI_CR 0x0000 +#define SPI_MR 0x0004 +#define SPI_RDR 0x0008 +#define SPI_TDR 0x000c +#define SPI_SR 0x0010 +#define SPI_IER 0x0014 +#define SPI_IDR 0x0018 +#define SPI_IMR 0x001c +#define SPI_CSR0 0x0030 +#define SPI_CSR1 0x0034 +#define SPI_CSR2 0x0038 +#define SPI_CSR3 0x003c +#define SPI_FMR 0x0040 +#define SPI_FLR 0x0044 +#define SPI_VERSION 0x00fc +#define SPI_RPR 0x0100 +#define SPI_RCR 0x0104 +#define SPI_TPR 0x0108 +#define SPI_TCR 0x010c +#define SPI_RNPR 0x0110 +#define SPI_RNCR 0x0114 +#define SPI_TNPR 0x0118 +#define SPI_TNCR 0x011c +#define SPI_PTCR 0x0120 +#define SPI_PTSR 0x0124 + +/* Bitfields in CR */ +#define SPI_SPIEN_OFFSET 0 +#define SPI_SPIEN_SIZE 1 +#define SPI_SPIDIS_OFFSET 1 +#define SPI_SPIDIS_SIZE 1 +#define SPI_SWRST_OFFSET 7 +#define SPI_SWRST_SIZE 1 +#define SPI_LASTXFER_OFFSET 24 +#define SPI_LASTXFER_SIZE 1 +#define SPI_TXFCLR_OFFSET 16 +#define SPI_TXFCLR_SIZE 1 +#define SPI_RXFCLR_OFFSET 17 +#define SPI_RXFCLR_SIZE 1 +#define SPI_FIFOEN_OFFSET 30 +#define SPI_FIFOEN_SIZE 1 +#define SPI_FIFODIS_OFFSET 31 +#define SPI_FIFODIS_SIZE 1 + +/* Bitfields in MR */ +#define SPI_MSTR_OFFSET 0 +#define SPI_MSTR_SIZE 1 +#define SPI_PS_OFFSET 1 +#define SPI_PS_SIZE 1 +#define SPI_PCSDEC_OFFSET 2 +#define SPI_PCSDEC_SIZE 1 +#define SPI_FDIV_OFFSET 3 +#define SPI_FDIV_SIZE 1 +#define SPI_MODFDIS_OFFSET 4 +#define SPI_MODFDIS_SIZE 1 +#define SPI_WDRBT_OFFSET 5 +#define SPI_WDRBT_SIZE 1 +#define SPI_LLB_OFFSET 7 +#define SPI_LLB_SIZE 1 +#define SPI_PCS_OFFSET 16 +#define SPI_PCS_SIZE 4 +#define SPI_DLYBCS_OFFSET 24 +#define SPI_DLYBCS_SIZE 8 + +/* Bitfields in RDR */ +#define SPI_RD_OFFSET 0 +#define SPI_RD_SIZE 16 + +/* Bitfields in TDR */ +#define SPI_TD_OFFSET 0 +#define SPI_TD_SIZE 16 + +/* Bitfields in SR */ +#define SPI_RDRF_OFFSET 0 +#define SPI_RDRF_SIZE 1 +#define SPI_TDRE_OFFSET 1 +#define SPI_TDRE_SIZE 1 +#define SPI_MODF_OFFSET 2 +#define SPI_MODF_SIZE 1 +#define SPI_OVRES_OFFSET 3 +#define SPI_OVRES_SIZE 1 +#define SPI_ENDRX_OFFSET 4 +#define SPI_ENDRX_SIZE 1 +#define SPI_ENDTX_OFFSET 5 +#define SPI_ENDTX_SIZE 1 +#define SPI_RXBUFF_OFFSET 6 +#define SPI_RXBUFF_SIZE 1 +#define SPI_TXBUFE_OFFSET 7 +#define SPI_TXBUFE_SIZE 1 +#define SPI_NSSR_OFFSET 8 +#define SPI_NSSR_SIZE 1 +#define SPI_TXEMPTY_OFFSET 9 +#define SPI_TXEMPTY_SIZE 1 +#define SPI_SPIENS_OFFSET 16 +#define SPI_SPIENS_SIZE 1 +#define SPI_TXFEF_OFFSET 24 +#define SPI_TXFEF_SIZE 1 +#define SPI_TXFFF_OFFSET 25 +#define SPI_TXFFF_SIZE 1 +#define SPI_TXFTHF_OFFSET 26 +#define SPI_TXFTHF_SIZE 1 +#define SPI_RXFEF_OFFSET 27 +#define SPI_RXFEF_SIZE 1 +#define SPI_RXFFF_OFFSET 28 +#define SPI_RXFFF_SIZE 1 +#define SPI_RXFTHF_OFFSET 29 +#define SPI_RXFTHF_SIZE 1 +#define SPI_TXFPTEF_OFFSET 30 +#define SPI_TXFPTEF_SIZE 1 +#define SPI_RXFPTEF_OFFSET 31 +#define SPI_RXFPTEF_SIZE 1 + +/* Bitfields in CSR0 */ +#define SPI_CPOL_OFFSET 0 +#define SPI_CPOL_SIZE 1 +#define SPI_NCPHA_OFFSET 1 +#define SPI_NCPHA_SIZE 1 +#define SPI_CSAAT_OFFSET 3 +#define SPI_CSAAT_SIZE 1 +#define SPI_BITS_OFFSET 4 +#define SPI_BITS_SIZE 4 +#define SPI_SCBR_OFFSET 8 +#define SPI_SCBR_SIZE 8 +#define SPI_DLYBS_OFFSET 16 +#define SPI_DLYBS_SIZE 8 +#define SPI_DLYBCT_OFFSET 24 +#define SPI_DLYBCT_SIZE 8 + +/* Bitfields in RCR */ +#define SPI_RXCTR_OFFSET 0 +#define SPI_RXCTR_SIZE 16 + +/* Bitfields in TCR */ +#define SPI_TXCTR_OFFSET 0 +#define SPI_TXCTR_SIZE 16 + +/* Bitfields in RNCR */ +#define SPI_RXNCR_OFFSET 0 +#define SPI_RXNCR_SIZE 16 + +/* Bitfields in TNCR */ +#define SPI_TXNCR_OFFSET 0 +#define SPI_TXNCR_SIZE 16 + +/* Bitfields in PTCR */ +#define SPI_RXTEN_OFFSET 0 +#define SPI_RXTEN_SIZE 1 +#define SPI_RXTDIS_OFFSET 1 +#define SPI_RXTDIS_SIZE 1 +#define SPI_TXTEN_OFFSET 8 +#define SPI_TXTEN_SIZE 1 +#define SPI_TXTDIS_OFFSET 9 +#define SPI_TXTDIS_SIZE 1 + +/* Bitfields in FMR */ +#define SPI_TXRDYM_OFFSET 0 +#define SPI_TXRDYM_SIZE 2 +#define SPI_RXRDYM_OFFSET 4 +#define SPI_RXRDYM_SIZE 2 +#define SPI_TXFTHRES_OFFSET 16 +#define SPI_TXFTHRES_SIZE 6 +#define SPI_RXFTHRES_OFFSET 24 +#define SPI_RXFTHRES_SIZE 6 + +/* Bitfields in FLR */ +#define SPI_TXFL_OFFSET 0 +#define SPI_TXFL_SIZE 6 +#define SPI_RXFL_OFFSET 16 +#define SPI_RXFL_SIZE 6 + +/* Constants for BITS */ +#define SPI_BITS_8_BPT 0 +#define SPI_BITS_9_BPT 1 +#define SPI_BITS_10_BPT 2 +#define SPI_BITS_11_BPT 3 +#define SPI_BITS_12_BPT 4 +#define SPI_BITS_13_BPT 5 +#define SPI_BITS_14_BPT 6 +#define SPI_BITS_15_BPT 7 +#define SPI_BITS_16_BPT 8 +#define SPI_ONE_DATA 0 +#define SPI_TWO_DATA 1 +#define SPI_FOUR_DATA 2 + +/* Bit manipulation macros */ +#define SPI_BIT(name) \ + (1 << SPI_##name##_OFFSET) +#define SPI_BF(name, value) \ + (((value) & ((1 << SPI_##name##_SIZE) - 1)) << SPI_##name##_OFFSET) +#define SPI_BFEXT(name, value) \ + (((value) >> SPI_##name##_OFFSET) & ((1 << SPI_##name##_SIZE) - 1)) +#define SPI_BFINS(name, value, old) \ + (((old) & ~(((1 << SPI_##name##_SIZE) - 1) << SPI_##name##_OFFSET)) \ + | SPI_BF(name, value)) + +/* Register access macros */ +#define spi_readl(port, reg) \ + readl_relaxed((port)->regs + SPI_##reg) +#define spi_writel(port, reg, value) \ + writel_relaxed((value), (port)->regs + SPI_##reg) +#define spi_writew(port, reg, value) \ + writew_relaxed((value), (port)->regs + SPI_##reg) + +/* use PIO for small transfers, avoiding DMA setup/teardown overhead and + * cache operations; better heuristics consider wordsize and bitrate. + */ +#define DMA_MIN_BYTES 16 + +#define SPI_DMA_TIMEOUT (msecs_to_jiffies(1000)) + +#define AUTOSUSPEND_TIMEOUT 2000 + +struct atmel_spi_caps { + bool is_spi2; + bool has_wdrbt; + bool has_dma_support; + bool has_pdc_support; +}; + +/* + * The core SPI transfer engine just talks to a register bank to set up + * DMA transfers; transfer queue progress is driven by IRQs. The clock + * framework provides the base clock, subdivided for each spi_device. + */ +struct atmel_spi { + spinlock_t lock; + unsigned long flags; + + phys_addr_t phybase; + void __iomem *regs; + int irq; + struct clk *clk; + struct platform_device *pdev; + unsigned long spi_clk; + + struct spi_transfer *current_transfer; + int current_remaining_bytes; + int done_status; + dma_addr_t dma_addr_rx_bbuf; + dma_addr_t dma_addr_tx_bbuf; + void *addr_rx_bbuf; + void *addr_tx_bbuf; + + struct completion xfer_completion; + + struct atmel_spi_caps caps; + + bool use_dma; + bool use_pdc; + + bool keep_cs; + + u32 fifo_size; + u8 native_cs_free; + u8 native_cs_for_gpio; +}; + +/* Controller-specific per-slave state */ +struct atmel_spi_device { + u32 csr; +}; + +#define SPI_MAX_DMA_XFER 65535 /* true for both PDC and DMA */ +#define INVALID_DMA_ADDRESS 0xffffffff + +/* + * Version 2 of the SPI controller has + * - CR.LASTXFER + * - SPI_MR.DIV32 may become FDIV or must-be-zero (here: always zero) + * - SPI_SR.TXEMPTY, SPI_SR.NSSR (and corresponding irqs) + * - SPI_CSRx.CSAAT + * - SPI_CSRx.SBCR allows faster clocking + */ +static bool atmel_spi_is_v2(struct atmel_spi *as) +{ + return as->caps.is_spi2; +} + +/* + * Earlier SPI controllers (e.g. on at91rm9200) have a design bug whereby + * they assume that spi slave device state will not change on deselect, so + * that automagic deselection is OK. ("NPCSx rises if no data is to be + * transmitted") Not so! Workaround uses nCSx pins as GPIOs; or newer + * controllers have CSAAT and friends. + * + * Even controller newer than ar91rm9200, using GPIOs can make sens as + * it lets us support active-high chipselects despite the controller's + * belief that only active-low devices/systems exists. + * + * However, at91rm9200 has a second erratum whereby nCS0 doesn't work + * right when driven with GPIO. ("Mode Fault does not allow more than one + * Master on Chip Select 0.") No workaround exists for that ... so for + * nCS0 on that chip, we (a) don't use the GPIO, (b) can't support CS_HIGH, + * and (c) will trigger that first erratum in some cases. + */ + +static void cs_activate(struct atmel_spi *as, struct spi_device *spi) +{ + struct atmel_spi_device *asd = spi->controller_state; + int chip_select; + u32 mr; + + if (spi->cs_gpiod) + chip_select = as->native_cs_for_gpio; + else + chip_select = spi->chip_select; + + if (atmel_spi_is_v2(as)) { + spi_writel(as, CSR0 + 4 * chip_select, asd->csr); + /* For the low SPI version, there is a issue that PDC transfer + * on CS1,2,3 needs SPI_CSR0.BITS config as SPI_CSR1,2,3.BITS + */ + spi_writel(as, CSR0, asd->csr); + if (as->caps.has_wdrbt) { + spi_writel(as, MR, + SPI_BF(PCS, ~(0x01 << chip_select)) + | SPI_BIT(WDRBT) + | SPI_BIT(MODFDIS) + | SPI_BIT(MSTR)); + } else { + spi_writel(as, MR, + SPI_BF(PCS, ~(0x01 << chip_select)) + | SPI_BIT(MODFDIS) + | SPI_BIT(MSTR)); + } + + mr = spi_readl(as, MR); + } else { + u32 cpol = (spi->mode & SPI_CPOL) ? SPI_BIT(CPOL) : 0; + int i; + u32 csr; + + /* Make sure clock polarity is correct */ + for (i = 0; i < spi->master->num_chipselect; i++) { + csr = spi_readl(as, CSR0 + 4 * i); + if ((csr ^ cpol) & SPI_BIT(CPOL)) + spi_writel(as, CSR0 + 4 * i, + csr ^ SPI_BIT(CPOL)); + } + + mr = spi_readl(as, MR); + mr = SPI_BFINS(PCS, ~(1 << chip_select), mr); + spi_writel(as, MR, mr); + } + + dev_dbg(&spi->dev, "activate NPCS, mr %08x\n", mr); +} + +static void cs_deactivate(struct atmel_spi *as, struct spi_device *spi) +{ + int chip_select; + u32 mr; + + if (spi->cs_gpiod) + chip_select = as->native_cs_for_gpio; + else + chip_select = spi->chip_select; + + /* only deactivate *this* device; sometimes transfers to + * another device may be active when this routine is called. + */ + mr = spi_readl(as, MR); + if (~SPI_BFEXT(PCS, mr) & (1 << chip_select)) { + mr = SPI_BFINS(PCS, 0xf, mr); + spi_writel(as, MR, mr); + } + + dev_dbg(&spi->dev, "DEactivate NPCS, mr %08x\n", mr); + + if (!spi->cs_gpiod) + spi_writel(as, CR, SPI_BIT(LASTXFER)); +} + +static void atmel_spi_lock(struct atmel_spi *as) __acquires(&as->lock) +{ + spin_lock_irqsave(&as->lock, as->flags); +} + +static void atmel_spi_unlock(struct atmel_spi *as) __releases(&as->lock) +{ + spin_unlock_irqrestore(&as->lock, as->flags); +} + +static inline bool atmel_spi_is_vmalloc_xfer(struct spi_transfer *xfer) +{ + return is_vmalloc_addr(xfer->tx_buf) || is_vmalloc_addr(xfer->rx_buf); +} + +static inline bool atmel_spi_use_dma(struct atmel_spi *as, + struct spi_transfer *xfer) +{ + return as->use_dma && xfer->len >= DMA_MIN_BYTES; +} + +static bool atmel_spi_can_dma(struct spi_master *master, + struct spi_device *spi, + struct spi_transfer *xfer) +{ + struct atmel_spi *as = spi_master_get_devdata(master); + + if (IS_ENABLED(CONFIG_SOC_SAM_V4_V5)) + return atmel_spi_use_dma(as, xfer) && + !atmel_spi_is_vmalloc_xfer(xfer); + else + return atmel_spi_use_dma(as, xfer); + +} + +static int atmel_spi_dma_slave_config(struct atmel_spi *as, + struct dma_slave_config *slave_config, + u8 bits_per_word) +{ + struct spi_master *master = platform_get_drvdata(as->pdev); + int err = 0; + + if (bits_per_word > 8) { + slave_config->dst_addr_width = DMA_SLAVE_BUSWIDTH_2_BYTES; + slave_config->src_addr_width = DMA_SLAVE_BUSWIDTH_2_BYTES; + } else { + slave_config->dst_addr_width = DMA_SLAVE_BUSWIDTH_1_BYTE; + slave_config->src_addr_width = DMA_SLAVE_BUSWIDTH_1_BYTE; + } + + slave_config->dst_addr = (dma_addr_t)as->phybase + SPI_TDR; + slave_config->src_addr = (dma_addr_t)as->phybase + SPI_RDR; + slave_config->src_maxburst = 1; + slave_config->dst_maxburst = 1; + slave_config->device_fc = false; + + /* + * This driver uses fixed peripheral select mode (PS bit set to '0' in + * the Mode Register). + * So according to the datasheet, when FIFOs are available (and + * enabled), the Transmit FIFO operates in Multiple Data Mode. + * In this mode, up to 2 data, not 4, can be written into the Transmit + * Data Register in a single access. + * However, the first data has to be written into the lowest 16 bits and + * the second data into the highest 16 bits of the Transmit + * Data Register. For 8bit data (the most frequent case), it would + * require to rework tx_buf so each data would actualy fit 16 bits. + * So we'd rather write only one data at the time. Hence the transmit + * path works the same whether FIFOs are available (and enabled) or not. + */ + slave_config->direction = DMA_MEM_TO_DEV; + if (dmaengine_slave_config(master->dma_tx, slave_config)) { + dev_err(&as->pdev->dev, + "failed to configure tx dma channel\n"); + err = -EINVAL; + } + + /* + * This driver configures the spi controller for master mode (MSTR bit + * set to '1' in the Mode Register). + * So according to the datasheet, when FIFOs are available (and + * enabled), the Receive FIFO operates in Single Data Mode. + * So the receive path works the same whether FIFOs are available (and + * enabled) or not. + */ + slave_config->direction = DMA_DEV_TO_MEM; + if (dmaengine_slave_config(master->dma_rx, slave_config)) { + dev_err(&as->pdev->dev, + "failed to configure rx dma channel\n"); + err = -EINVAL; + } + + return err; +} + +static int atmel_spi_configure_dma(struct spi_master *master, + struct atmel_spi *as) +{ + struct dma_slave_config slave_config; + struct device *dev = &as->pdev->dev; + int err; + + dma_cap_mask_t mask; + dma_cap_zero(mask); + dma_cap_set(DMA_SLAVE, mask); + + master->dma_tx = dma_request_chan(dev, "tx"); + if (IS_ERR(master->dma_tx)) { + err = dev_err_probe(dev, PTR_ERR(master->dma_tx), + "No TX DMA channel, DMA is disabled\n"); + goto error_clear; + } + + master->dma_rx = dma_request_chan(dev, "rx"); + if (IS_ERR(master->dma_rx)) { + err = PTR_ERR(master->dma_rx); + /* + * No reason to check EPROBE_DEFER here since we have already + * requested tx channel. + */ + dev_err(dev, "No RX DMA channel, DMA is disabled\n"); + goto error; + } + + err = atmel_spi_dma_slave_config(as, &slave_config, 8); + if (err) + goto error; + + dev_info(&as->pdev->dev, + "Using %s (tx) and %s (rx) for DMA transfers\n", + dma_chan_name(master->dma_tx), + dma_chan_name(master->dma_rx)); + + return 0; +error: + if (!IS_ERR(master->dma_rx)) + dma_release_channel(master->dma_rx); + if (!IS_ERR(master->dma_tx)) + dma_release_channel(master->dma_tx); +error_clear: + master->dma_tx = master->dma_rx = NULL; + return err; +} + +static void atmel_spi_stop_dma(struct spi_master *master) +{ + if (master->dma_rx) + dmaengine_terminate_all(master->dma_rx); + if (master->dma_tx) + dmaengine_terminate_all(master->dma_tx); +} + +static void atmel_spi_release_dma(struct spi_master *master) +{ + if (master->dma_rx) { + dma_release_channel(master->dma_rx); + master->dma_rx = NULL; + } + if (master->dma_tx) { + dma_release_channel(master->dma_tx); + master->dma_tx = NULL; + } +} + +/* This function is called by the DMA driver from tasklet context */ +static void dma_callback(void *data) +{ + struct spi_master *master = data; + struct atmel_spi *as = spi_master_get_devdata(master); + + if (is_vmalloc_addr(as->current_transfer->rx_buf) && + IS_ENABLED(CONFIG_SOC_SAM_V4_V5)) { + memcpy(as->current_transfer->rx_buf, as->addr_rx_bbuf, + as->current_transfer->len); + } + complete(&as->xfer_completion); +} + +/* + * Next transfer using PIO without FIFO. + */ +static void atmel_spi_next_xfer_single(struct spi_master *master, + struct spi_transfer *xfer) +{ + struct atmel_spi *as = spi_master_get_devdata(master); + unsigned long xfer_pos = xfer->len - as->current_remaining_bytes; + + dev_vdbg(master->dev.parent, "atmel_spi_next_xfer_pio\n"); + + /* Make sure data is not remaining in RDR */ + spi_readl(as, RDR); + while (spi_readl(as, SR) & SPI_BIT(RDRF)) { + spi_readl(as, RDR); + cpu_relax(); + } + + if (xfer->bits_per_word > 8) + spi_writel(as, TDR, *(u16 *)(xfer->tx_buf + xfer_pos)); + else + spi_writel(as, TDR, *(u8 *)(xfer->tx_buf + xfer_pos)); + + dev_dbg(master->dev.parent, + " start pio xfer %p: len %u tx %p rx %p bitpw %d\n", + xfer, xfer->len, xfer->tx_buf, xfer->rx_buf, + xfer->bits_per_word); + + /* Enable relevant interrupts */ + spi_writel(as, IER, SPI_BIT(RDRF) | SPI_BIT(OVRES)); +} + +/* + * Next transfer using PIO with FIFO. + */ +static void atmel_spi_next_xfer_fifo(struct spi_master *master, + struct spi_transfer *xfer) +{ + struct atmel_spi *as = spi_master_get_devdata(master); + u32 current_remaining_data, num_data; + u32 offset = xfer->len - as->current_remaining_bytes; + const u16 *words = (const u16 *)((u8 *)xfer->tx_buf + offset); + const u8 *bytes = (const u8 *)((u8 *)xfer->tx_buf + offset); + u16 td0, td1; + u32 fifomr; + + dev_vdbg(master->dev.parent, "atmel_spi_next_xfer_fifo\n"); + + /* Compute the number of data to transfer in the current iteration */ + current_remaining_data = ((xfer->bits_per_word > 8) ? + ((u32)as->current_remaining_bytes >> 1) : + (u32)as->current_remaining_bytes); + num_data = min(current_remaining_data, as->fifo_size); + + /* Flush RX and TX FIFOs */ + spi_writel(as, CR, SPI_BIT(RXFCLR) | SPI_BIT(TXFCLR)); + while (spi_readl(as, FLR)) + cpu_relax(); + + /* Set RX FIFO Threshold to the number of data to transfer */ + fifomr = spi_readl(as, FMR); + spi_writel(as, FMR, SPI_BFINS(RXFTHRES, num_data, fifomr)); + + /* Clear FIFO flags in the Status Register, especially RXFTHF */ + (void)spi_readl(as, SR); + + /* Fill TX FIFO */ + while (num_data >= 2) { + if (xfer->bits_per_word > 8) { + td0 = *words++; + td1 = *words++; + } else { + td0 = *bytes++; + td1 = *bytes++; + } + + spi_writel(as, TDR, (td1 << 16) | td0); + num_data -= 2; + } + + if (num_data) { + if (xfer->bits_per_word > 8) + td0 = *words++; + else + td0 = *bytes++; + + spi_writew(as, TDR, td0); + num_data--; + } + + dev_dbg(master->dev.parent, + " start fifo xfer %p: len %u tx %p rx %p bitpw %d\n", + xfer, xfer->len, xfer->tx_buf, xfer->rx_buf, + xfer->bits_per_word); + + /* + * Enable RX FIFO Threshold Flag interrupt to be notified about + * transfer completion. + */ + spi_writel(as, IER, SPI_BIT(RXFTHF) | SPI_BIT(OVRES)); +} + +/* + * Next transfer using PIO. + */ +static void atmel_spi_next_xfer_pio(struct spi_master *master, + struct spi_transfer *xfer) +{ + struct atmel_spi *as = spi_master_get_devdata(master); + + if (as->fifo_size) + atmel_spi_next_xfer_fifo(master, xfer); + else + atmel_spi_next_xfer_single(master, xfer); +} + +/* + * Submit next transfer for DMA. + */ +static int atmel_spi_next_xfer_dma_submit(struct spi_master *master, + struct spi_transfer *xfer, + u32 *plen) + __must_hold(&as->lock) +{ + struct atmel_spi *as = spi_master_get_devdata(master); + struct dma_chan *rxchan = master->dma_rx; + struct dma_chan *txchan = master->dma_tx; + struct dma_async_tx_descriptor *rxdesc; + struct dma_async_tx_descriptor *txdesc; + struct dma_slave_config slave_config; + dma_cookie_t cookie; + + dev_vdbg(master->dev.parent, "atmel_spi_next_xfer_dma_submit\n"); + + /* Check that the channels are available */ + if (!rxchan || !txchan) + return -ENODEV; + + /* release lock for DMA operations */ + atmel_spi_unlock(as); + + *plen = xfer->len; + + if (atmel_spi_dma_slave_config(as, &slave_config, + xfer->bits_per_word)) + goto err_exit; + + /* Send both scatterlists */ + if (atmel_spi_is_vmalloc_xfer(xfer) && + IS_ENABLED(CONFIG_SOC_SAM_V4_V5)) { + rxdesc = dmaengine_prep_slave_single(rxchan, + as->dma_addr_rx_bbuf, + xfer->len, + DMA_DEV_TO_MEM, + DMA_PREP_INTERRUPT | + DMA_CTRL_ACK); + } else { + rxdesc = dmaengine_prep_slave_sg(rxchan, + xfer->rx_sg.sgl, + xfer->rx_sg.nents, + DMA_DEV_TO_MEM, + DMA_PREP_INTERRUPT | + DMA_CTRL_ACK); + } + if (!rxdesc) + goto err_dma; + + if (atmel_spi_is_vmalloc_xfer(xfer) && + IS_ENABLED(CONFIG_SOC_SAM_V4_V5)) { + memcpy(as->addr_tx_bbuf, xfer->tx_buf, xfer->len); + txdesc = dmaengine_prep_slave_single(txchan, + as->dma_addr_tx_bbuf, + xfer->len, DMA_MEM_TO_DEV, + DMA_PREP_INTERRUPT | + DMA_CTRL_ACK); + } else { + txdesc = dmaengine_prep_slave_sg(txchan, + xfer->tx_sg.sgl, + xfer->tx_sg.nents, + DMA_MEM_TO_DEV, + DMA_PREP_INTERRUPT | + DMA_CTRL_ACK); + } + if (!txdesc) + goto err_dma; + + dev_dbg(master->dev.parent, + " start dma xfer %p: len %u tx %p/%08llx rx %p/%08llx\n", + xfer, xfer->len, xfer->tx_buf, (unsigned long long)xfer->tx_dma, + xfer->rx_buf, (unsigned long long)xfer->rx_dma); + + /* Enable relevant interrupts */ + spi_writel(as, IER, SPI_BIT(OVRES)); + + /* Put the callback on the RX transfer only, that should finish last */ + rxdesc->callback = dma_callback; + rxdesc->callback_param = master; + + /* Submit and fire RX and TX with TX last so we're ready to read! */ + cookie = rxdesc->tx_submit(rxdesc); + if (dma_submit_error(cookie)) + goto err_dma; + cookie = txdesc->tx_submit(txdesc); + if (dma_submit_error(cookie)) + goto err_dma; + rxchan->device->device_issue_pending(rxchan); + txchan->device->device_issue_pending(txchan); + + /* take back lock */ + atmel_spi_lock(as); + return 0; + +err_dma: + spi_writel(as, IDR, SPI_BIT(OVRES)); + atmel_spi_stop_dma(master); +err_exit: + atmel_spi_lock(as); + return -ENOMEM; +} + +static void atmel_spi_next_xfer_data(struct spi_master *master, + struct spi_transfer *xfer, + dma_addr_t *tx_dma, + dma_addr_t *rx_dma, + u32 *plen) +{ + *rx_dma = xfer->rx_dma + xfer->len - *plen; + *tx_dma = xfer->tx_dma + xfer->len - *plen; + if (*plen > master->max_dma_len) + *plen = master->max_dma_len; +} + +static int atmel_spi_set_xfer_speed(struct atmel_spi *as, + struct spi_device *spi, + struct spi_transfer *xfer) +{ + u32 scbr, csr; + unsigned long bus_hz; + int chip_select; + + if (spi->cs_gpiod) + chip_select = as->native_cs_for_gpio; + else + chip_select = spi->chip_select; + + /* v1 chips start out at half the peripheral bus speed. */ + bus_hz = as->spi_clk; + if (!atmel_spi_is_v2(as)) + bus_hz /= 2; + + /* + * Calculate the lowest divider that satisfies the + * constraint, assuming div32/fdiv/mbz == 0. + */ + scbr = DIV_ROUND_UP(bus_hz, xfer->speed_hz); + + /* + * If the resulting divider doesn't fit into the + * register bitfield, we can't satisfy the constraint. + */ + if (scbr >= (1 << SPI_SCBR_SIZE)) { + dev_err(&spi->dev, + "setup: %d Hz too slow, scbr %u; min %ld Hz\n", + xfer->speed_hz, scbr, bus_hz/255); + return -EINVAL; + } + if (scbr == 0) { + dev_err(&spi->dev, + "setup: %d Hz too high, scbr %u; max %ld Hz\n", + xfer->speed_hz, scbr, bus_hz); + return -EINVAL; + } + csr = spi_readl(as, CSR0 + 4 * chip_select); + csr = SPI_BFINS(SCBR, scbr, csr); + spi_writel(as, CSR0 + 4 * chip_select, csr); + xfer->effective_speed_hz = bus_hz / scbr; + + return 0; +} + +/* + * Submit next transfer for PDC. + * lock is held, spi irq is blocked + */ +static void atmel_spi_pdc_next_xfer(struct spi_master *master, + struct spi_transfer *xfer) +{ + struct atmel_spi *as = spi_master_get_devdata(master); + u32 len; + dma_addr_t tx_dma, rx_dma; + + spi_writel(as, PTCR, SPI_BIT(RXTDIS) | SPI_BIT(TXTDIS)); + + len = as->current_remaining_bytes; + atmel_spi_next_xfer_data(master, xfer, &tx_dma, &rx_dma, &len); + as->current_remaining_bytes -= len; + + spi_writel(as, RPR, rx_dma); + spi_writel(as, TPR, tx_dma); + + if (xfer->bits_per_word > 8) + len >>= 1; + spi_writel(as, RCR, len); + spi_writel(as, TCR, len); + + dev_dbg(&master->dev, + " start xfer %p: len %u tx %p/%08llx rx %p/%08llx\n", + xfer, xfer->len, xfer->tx_buf, + (unsigned long long)xfer->tx_dma, xfer->rx_buf, + (unsigned long long)xfer->rx_dma); + + if (as->current_remaining_bytes) { + len = as->current_remaining_bytes; + atmel_spi_next_xfer_data(master, xfer, &tx_dma, &rx_dma, &len); + as->current_remaining_bytes -= len; + + spi_writel(as, RNPR, rx_dma); + spi_writel(as, TNPR, tx_dma); + + if (xfer->bits_per_word > 8) + len >>= 1; + spi_writel(as, RNCR, len); + spi_writel(as, TNCR, len); + + dev_dbg(&master->dev, + " next xfer %p: len %u tx %p/%08llx rx %p/%08llx\n", + xfer, xfer->len, xfer->tx_buf, + (unsigned long long)xfer->tx_dma, xfer->rx_buf, + (unsigned long long)xfer->rx_dma); + } + + /* REVISIT: We're waiting for RXBUFF before we start the next + * transfer because we need to handle some difficult timing + * issues otherwise. If we wait for TXBUFE in one transfer and + * then starts waiting for RXBUFF in the next, it's difficult + * to tell the difference between the RXBUFF interrupt we're + * actually waiting for and the RXBUFF interrupt of the + * previous transfer. + * + * It should be doable, though. Just not now... + */ + spi_writel(as, IER, SPI_BIT(RXBUFF) | SPI_BIT(OVRES)); + spi_writel(as, PTCR, SPI_BIT(TXTEN) | SPI_BIT(RXTEN)); +} + +/* + * For DMA, tx_buf/tx_dma have the same relationship as rx_buf/rx_dma: + * - The buffer is either valid for CPU access, else NULL + * - If the buffer is valid, so is its DMA address + * + * This driver manages the dma address unless message->is_dma_mapped. + */ +static int +atmel_spi_dma_map_xfer(struct atmel_spi *as, struct spi_transfer *xfer) +{ + struct device *dev = &as->pdev->dev; + + xfer->tx_dma = xfer->rx_dma = INVALID_DMA_ADDRESS; + if (xfer->tx_buf) { + /* tx_buf is a const void* where we need a void * for the dma + * mapping */ + void *nonconst_tx = (void *)xfer->tx_buf; + + xfer->tx_dma = dma_map_single(dev, + nonconst_tx, xfer->len, + DMA_TO_DEVICE); + if (dma_mapping_error(dev, xfer->tx_dma)) + return -ENOMEM; + } + if (xfer->rx_buf) { + xfer->rx_dma = dma_map_single(dev, + xfer->rx_buf, xfer->len, + DMA_FROM_DEVICE); + if (dma_mapping_error(dev, xfer->rx_dma)) { + if (xfer->tx_buf) + dma_unmap_single(dev, + xfer->tx_dma, xfer->len, + DMA_TO_DEVICE); + return -ENOMEM; + } + } + return 0; +} + +static void atmel_spi_dma_unmap_xfer(struct spi_master *master, + struct spi_transfer *xfer) +{ + if (xfer->tx_dma != INVALID_DMA_ADDRESS) + dma_unmap_single(master->dev.parent, xfer->tx_dma, + xfer->len, DMA_TO_DEVICE); + if (xfer->rx_dma != INVALID_DMA_ADDRESS) + dma_unmap_single(master->dev.parent, xfer->rx_dma, + xfer->len, DMA_FROM_DEVICE); +} + +static void atmel_spi_disable_pdc_transfer(struct atmel_spi *as) +{ + spi_writel(as, PTCR, SPI_BIT(RXTDIS) | SPI_BIT(TXTDIS)); +} + +static void +atmel_spi_pump_single_data(struct atmel_spi *as, struct spi_transfer *xfer) +{ + u8 *rxp; + u16 *rxp16; + unsigned long xfer_pos = xfer->len - as->current_remaining_bytes; + + if (xfer->bits_per_word > 8) { + rxp16 = (u16 *)(((u8 *)xfer->rx_buf) + xfer_pos); + *rxp16 = spi_readl(as, RDR); + } else { + rxp = ((u8 *)xfer->rx_buf) + xfer_pos; + *rxp = spi_readl(as, RDR); + } + if (xfer->bits_per_word > 8) { + if (as->current_remaining_bytes > 2) + as->current_remaining_bytes -= 2; + else + as->current_remaining_bytes = 0; + } else { + as->current_remaining_bytes--; + } +} + +static void +atmel_spi_pump_fifo_data(struct atmel_spi *as, struct spi_transfer *xfer) +{ + u32 fifolr = spi_readl(as, FLR); + u32 num_bytes, num_data = SPI_BFEXT(RXFL, fifolr); + u32 offset = xfer->len - as->current_remaining_bytes; + u16 *words = (u16 *)((u8 *)xfer->rx_buf + offset); + u8 *bytes = (u8 *)((u8 *)xfer->rx_buf + offset); + u16 rd; /* RD field is the lowest 16 bits of RDR */ + + /* Update the number of remaining bytes to transfer */ + num_bytes = ((xfer->bits_per_word > 8) ? + (num_data << 1) : + num_data); + + if (as->current_remaining_bytes > num_bytes) + as->current_remaining_bytes -= num_bytes; + else + as->current_remaining_bytes = 0; + + /* Handle odd number of bytes when data are more than 8bit width */ + if (xfer->bits_per_word > 8) + as->current_remaining_bytes &= ~0x1; + + /* Read data */ + while (num_data) { + rd = spi_readl(as, RDR); + if (xfer->bits_per_word > 8) + *words++ = rd; + else + *bytes++ = rd; + num_data--; + } +} + +/* Called from IRQ + * + * Must update "current_remaining_bytes" to keep track of data + * to transfer. + */ +static void +atmel_spi_pump_pio_data(struct atmel_spi *as, struct spi_transfer *xfer) +{ + if (as->fifo_size) + atmel_spi_pump_fifo_data(as, xfer); + else + atmel_spi_pump_single_data(as, xfer); +} + +/* Interrupt + * + * No need for locking in this Interrupt handler: done_status is the + * only information modified. + */ +static irqreturn_t +atmel_spi_pio_interrupt(int irq, void *dev_id) +{ + struct spi_master *master = dev_id; + struct atmel_spi *as = spi_master_get_devdata(master); + u32 status, pending, imr; + struct spi_transfer *xfer; + int ret = IRQ_NONE; + + imr = spi_readl(as, IMR); + status = spi_readl(as, SR); + pending = status & imr; + + if (pending & SPI_BIT(OVRES)) { + ret = IRQ_HANDLED; + spi_writel(as, IDR, SPI_BIT(OVRES)); + dev_warn(master->dev.parent, "overrun\n"); + + /* + * When we get an overrun, we disregard the current + * transfer. Data will not be copied back from any + * bounce buffer and msg->actual_len will not be + * updated with the last xfer. + * + * We will also not process any remaning transfers in + * the message. + */ + as->done_status = -EIO; + smp_wmb(); + + /* Clear any overrun happening while cleaning up */ + spi_readl(as, SR); + + complete(&as->xfer_completion); + + } else if (pending & (SPI_BIT(RDRF) | SPI_BIT(RXFTHF))) { + atmel_spi_lock(as); + + if (as->current_remaining_bytes) { + ret = IRQ_HANDLED; + xfer = as->current_transfer; + atmel_spi_pump_pio_data(as, xfer); + if (!as->current_remaining_bytes) + spi_writel(as, IDR, pending); + + complete(&as->xfer_completion); + } + + atmel_spi_unlock(as); + } else { + WARN_ONCE(pending, "IRQ not handled, pending = %x\n", pending); + ret = IRQ_HANDLED; + spi_writel(as, IDR, pending); + } + + return ret; +} + +static irqreturn_t +atmel_spi_pdc_interrupt(int irq, void *dev_id) +{ + struct spi_master *master = dev_id; + struct atmel_spi *as = spi_master_get_devdata(master); + u32 status, pending, imr; + int ret = IRQ_NONE; + + imr = spi_readl(as, IMR); + status = spi_readl(as, SR); + pending = status & imr; + + if (pending & SPI_BIT(OVRES)) { + + ret = IRQ_HANDLED; + + spi_writel(as, IDR, (SPI_BIT(RXBUFF) | SPI_BIT(ENDRX) + | SPI_BIT(OVRES))); + + /* Clear any overrun happening while cleaning up */ + spi_readl(as, SR); + + as->done_status = -EIO; + + complete(&as->xfer_completion); + + } else if (pending & (SPI_BIT(RXBUFF) | SPI_BIT(ENDRX))) { + ret = IRQ_HANDLED; + + spi_writel(as, IDR, pending); + + complete(&as->xfer_completion); + } + + return ret; +} + +static int atmel_word_delay_csr(struct spi_device *spi, struct atmel_spi *as) +{ + struct spi_delay *delay = &spi->word_delay; + u32 value = delay->value; + + switch (delay->unit) { + case SPI_DELAY_UNIT_NSECS: + value /= 1000; + break; + case SPI_DELAY_UNIT_USECS: + break; + default: + return -EINVAL; + } + + return (as->spi_clk / 1000000 * value) >> 5; +} + +static void initialize_native_cs_for_gpio(struct atmel_spi *as) +{ + int i; + struct spi_master *master = platform_get_drvdata(as->pdev); + + if (!as->native_cs_free) + return; /* already initialized */ + + if (!master->cs_gpiods) + return; /* No CS GPIO */ + + /* + * On the first version of the controller (AT91RM9200), CS0 + * can't be used associated with GPIO + */ + if (atmel_spi_is_v2(as)) + i = 0; + else + i = 1; + + for (; i < 4; i++) + if (master->cs_gpiods[i]) + as->native_cs_free |= BIT(i); + + if (as->native_cs_free) + as->native_cs_for_gpio = ffs(as->native_cs_free); +} + +static int atmel_spi_setup(struct spi_device *spi) +{ + struct atmel_spi *as; + struct atmel_spi_device *asd; + u32 csr; + unsigned int bits = spi->bits_per_word; + int chip_select; + int word_delay_csr; + + as = spi_master_get_devdata(spi->master); + + /* see notes above re chipselect */ + if (!spi->cs_gpiod && (spi->mode & SPI_CS_HIGH)) { + dev_warn(&spi->dev, "setup: non GPIO CS can't be active-high\n"); + return -EINVAL; + } + + /* Setup() is called during spi_register_controller(aka + * spi_register_master) but after all membmers of the cs_gpiod + * array have been filled, so we can looked for which native + * CS will be free for using with GPIO + */ + initialize_native_cs_for_gpio(as); + + if (spi->cs_gpiod && as->native_cs_free) { + dev_err(&spi->dev, + "No native CS available to support this GPIO CS\n"); + return -EBUSY; + } + + if (spi->cs_gpiod) + chip_select = as->native_cs_for_gpio; + else + chip_select = spi->chip_select; + + csr = SPI_BF(BITS, bits - 8); + if (spi->mode & SPI_CPOL) + csr |= SPI_BIT(CPOL); + if (!(spi->mode & SPI_CPHA)) + csr |= SPI_BIT(NCPHA); + + if (!spi->cs_gpiod) + csr |= SPI_BIT(CSAAT); + csr |= SPI_BF(DLYBS, 0); + + word_delay_csr = atmel_word_delay_csr(spi, as); + if (word_delay_csr < 0) + return word_delay_csr; + + /* DLYBCT adds delays between words. This is useful for slow devices + * that need a bit of time to setup the next transfer. + */ + csr |= SPI_BF(DLYBCT, word_delay_csr); + + asd = spi->controller_state; + if (!asd) { + asd = kzalloc(sizeof(struct atmel_spi_device), GFP_KERNEL); + if (!asd) + return -ENOMEM; + + spi->controller_state = asd; + } + + asd->csr = csr; + + dev_dbg(&spi->dev, + "setup: bpw %u mode 0x%x -> csr%d %08x\n", + bits, spi->mode, spi->chip_select, csr); + + if (!atmel_spi_is_v2(as)) + spi_writel(as, CSR0 + 4 * chip_select, csr); + + return 0; +} + +static void atmel_spi_set_cs(struct spi_device *spi, bool enable) +{ + struct atmel_spi *as = spi_master_get_devdata(spi->master); + /* the core doesn't really pass us enable/disable, but CS HIGH vs CS LOW + * since we already have routines for activate/deactivate translate + * high/low to active/inactive + */ + enable = (!!(spi->mode & SPI_CS_HIGH) == enable); + + if (enable) { + cs_activate(as, spi); + } else { + cs_deactivate(as, spi); + } + +} + +static int atmel_spi_one_transfer(struct spi_master *master, + struct spi_device *spi, + struct spi_transfer *xfer) +{ + struct atmel_spi *as; + u8 bits; + u32 len; + struct atmel_spi_device *asd; + int timeout; + int ret; + unsigned long dma_timeout; + + as = spi_master_get_devdata(master); + /* This lock was orignally taken in atmel_spi_trasfer_one_message */ + atmel_spi_lock(as); + + asd = spi->controller_state; + bits = (asd->csr >> 4) & 0xf; + if (bits != xfer->bits_per_word - 8) { + dev_dbg(&spi->dev, + "you can't yet change bits_per_word in transfers\n"); + return -ENOPROTOOPT; + } + + /* + * DMA map early, for performance (empties dcache ASAP) and + * better fault reporting. + */ + if ((!master->cur_msg->is_dma_mapped) + && as->use_pdc) { + if (atmel_spi_dma_map_xfer(as, xfer) < 0) + return -ENOMEM; + } + + atmel_spi_set_xfer_speed(as, spi, xfer); + + as->done_status = 0; + as->current_transfer = xfer; + as->current_remaining_bytes = xfer->len; + while (as->current_remaining_bytes) { + reinit_completion(&as->xfer_completion); + + if (as->use_pdc) { + atmel_spi_pdc_next_xfer(master, xfer); + } else if (atmel_spi_use_dma(as, xfer)) { + len = as->current_remaining_bytes; + ret = atmel_spi_next_xfer_dma_submit(master, + xfer, &len); + if (ret) { + dev_err(&spi->dev, + "unable to use DMA, fallback to PIO\n"); + as->done_status = ret; + break; + } else { + as->current_remaining_bytes -= len; + if (as->current_remaining_bytes < 0) + as->current_remaining_bytes = 0; + } + } else { + atmel_spi_next_xfer_pio(master, xfer); + } + + /* interrupts are disabled, so free the lock for schedule */ + atmel_spi_unlock(as); + dma_timeout = wait_for_completion_timeout(&as->xfer_completion, + SPI_DMA_TIMEOUT); + atmel_spi_lock(as); + if (WARN_ON(dma_timeout == 0)) { + dev_err(&spi->dev, "spi transfer timeout\n"); + as->done_status = -EIO; + } + + if (as->done_status) + break; + } + + if (as->done_status) { + if (as->use_pdc) { + dev_warn(master->dev.parent, + "overrun (%u/%u remaining)\n", + spi_readl(as, TCR), spi_readl(as, RCR)); + + /* + * Clean up DMA registers and make sure the data + * registers are empty. + */ + spi_writel(as, RNCR, 0); + spi_writel(as, TNCR, 0); + spi_writel(as, RCR, 0); + spi_writel(as, TCR, 0); + for (timeout = 1000; timeout; timeout--) + if (spi_readl(as, SR) & SPI_BIT(TXEMPTY)) + break; + if (!timeout) + dev_warn(master->dev.parent, + "timeout waiting for TXEMPTY"); + while (spi_readl(as, SR) & SPI_BIT(RDRF)) + spi_readl(as, RDR); + + /* Clear any overrun happening while cleaning up */ + spi_readl(as, SR); + + } else if (atmel_spi_use_dma(as, xfer)) { + atmel_spi_stop_dma(master); + } + } + + if (!master->cur_msg->is_dma_mapped + && as->use_pdc) + atmel_spi_dma_unmap_xfer(master, xfer); + + if (as->use_pdc) + atmel_spi_disable_pdc_transfer(as); + + atmel_spi_unlock(as); + + return as->done_status; +} + +static void atmel_spi_cleanup(struct spi_device *spi) +{ + struct atmel_spi_device *asd = spi->controller_state; + + if (!asd) + return; + + spi->controller_state = NULL; + kfree(asd); +} + +static inline unsigned int atmel_get_version(struct atmel_spi *as) +{ + return spi_readl(as, VERSION) & 0x00000fff; +} + +static void atmel_get_caps(struct atmel_spi *as) +{ + unsigned int version; + + version = atmel_get_version(as); + + as->caps.is_spi2 = version > 0x121; + as->caps.has_wdrbt = version >= 0x210; + as->caps.has_dma_support = version >= 0x212; + as->caps.has_pdc_support = version < 0x212; +} + +static void atmel_spi_init(struct atmel_spi *as) +{ + spi_writel(as, CR, SPI_BIT(SWRST)); + spi_writel(as, CR, SPI_BIT(SWRST)); /* AT91SAM9263 Rev B workaround */ + + /* It is recommended to enable FIFOs first thing after reset */ + if (as->fifo_size) + spi_writel(as, CR, SPI_BIT(FIFOEN)); + + if (as->caps.has_wdrbt) { + spi_writel(as, MR, SPI_BIT(WDRBT) | SPI_BIT(MODFDIS) + | SPI_BIT(MSTR)); + } else { + spi_writel(as, MR, SPI_BIT(MSTR) | SPI_BIT(MODFDIS)); + } + + if (as->use_pdc) + spi_writel(as, PTCR, SPI_BIT(RXTDIS) | SPI_BIT(TXTDIS)); + spi_writel(as, CR, SPI_BIT(SPIEN)); +} + +static int atmel_spi_probe(struct platform_device *pdev) +{ + struct resource *regs; + int irq; + struct clk *clk; + int ret; + struct spi_master *master; + struct atmel_spi *as; + + /* Select default pin state */ + pinctrl_pm_select_default_state(&pdev->dev); + + regs = platform_get_resource(pdev, IORESOURCE_MEM, 0); + if (!regs) + return -ENXIO; + + irq = platform_get_irq(pdev, 0); + if (irq < 0) + return irq; + + clk = devm_clk_get(&pdev->dev, "spi_clk"); + if (IS_ERR(clk)) + return PTR_ERR(clk); + + /* setup spi core then atmel-specific driver state */ + master = spi_alloc_master(&pdev->dev, sizeof(*as)); + if (!master) + return -ENOMEM; + + /* the spi->mode bits understood by this driver: */ + master->use_gpio_descriptors = true; + master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH; + master->bits_per_word_mask = SPI_BPW_RANGE_MASK(8, 16); + master->dev.of_node = pdev->dev.of_node; + master->bus_num = pdev->id; + master->num_chipselect = 4; + master->setup = atmel_spi_setup; + master->flags = (SPI_MASTER_MUST_RX | SPI_MASTER_MUST_TX | + SPI_MASTER_GPIO_SS); + master->transfer_one = atmel_spi_one_transfer; + master->set_cs = atmel_spi_set_cs; + master->cleanup = atmel_spi_cleanup; + master->auto_runtime_pm = true; + master->max_dma_len = SPI_MAX_DMA_XFER; + master->can_dma = atmel_spi_can_dma; + platform_set_drvdata(pdev, master); + + as = spi_master_get_devdata(master); + + spin_lock_init(&as->lock); + + as->pdev = pdev; + as->regs = devm_ioremap_resource(&pdev->dev, regs); + if (IS_ERR(as->regs)) { + ret = PTR_ERR(as->regs); + goto out_unmap_regs; + } + as->phybase = regs->start; + as->irq = irq; + as->clk = clk; + + init_completion(&as->xfer_completion); + + atmel_get_caps(as); + + as->use_dma = false; + as->use_pdc = false; + if (as->caps.has_dma_support) { + ret = atmel_spi_configure_dma(master, as); + if (ret == 0) { + as->use_dma = true; + } else if (ret == -EPROBE_DEFER) { + goto out_unmap_regs; + } + } else if (as->caps.has_pdc_support) { + as->use_pdc = true; + } + + if (IS_ENABLED(CONFIG_SOC_SAM_V4_V5)) { + as->addr_rx_bbuf = dma_alloc_coherent(&pdev->dev, + SPI_MAX_DMA_XFER, + &as->dma_addr_rx_bbuf, + GFP_KERNEL | GFP_DMA); + if (!as->addr_rx_bbuf) { + as->use_dma = false; + } else { + as->addr_tx_bbuf = dma_alloc_coherent(&pdev->dev, + SPI_MAX_DMA_XFER, + &as->dma_addr_tx_bbuf, + GFP_KERNEL | GFP_DMA); + if (!as->addr_tx_bbuf) { + as->use_dma = false; + dma_free_coherent(&pdev->dev, SPI_MAX_DMA_XFER, + as->addr_rx_bbuf, + as->dma_addr_rx_bbuf); + } + } + if (!as->use_dma) + dev_info(master->dev.parent, + " can not allocate dma coherent memory\n"); + } + + if (as->caps.has_dma_support && !as->use_dma) + dev_info(&pdev->dev, "Atmel SPI Controller using PIO only\n"); + + if (as->use_pdc) { + ret = devm_request_irq(&pdev->dev, irq, atmel_spi_pdc_interrupt, + 0, dev_name(&pdev->dev), master); + } else { + ret = devm_request_irq(&pdev->dev, irq, atmel_spi_pio_interrupt, + 0, dev_name(&pdev->dev), master); + } + if (ret) + goto out_unmap_regs; + + /* Initialize the hardware */ + ret = clk_prepare_enable(clk); + if (ret) + goto out_free_irq; + + as->spi_clk = clk_get_rate(clk); + + as->fifo_size = 0; + if (!of_property_read_u32(pdev->dev.of_node, "atmel,fifo-size", + &as->fifo_size)) { + dev_info(&pdev->dev, "Using FIFO (%u data)\n", as->fifo_size); + } + + atmel_spi_init(as); + + pm_runtime_set_autosuspend_delay(&pdev->dev, AUTOSUSPEND_TIMEOUT); + pm_runtime_use_autosuspend(&pdev->dev); + pm_runtime_set_active(&pdev->dev); + pm_runtime_enable(&pdev->dev); + + ret = devm_spi_register_master(&pdev->dev, master); + if (ret) + goto out_free_dma; + + /* go! */ + dev_info(&pdev->dev, "Atmel SPI Controller version 0x%x at 0x%08lx (irq %d)\n", + atmel_get_version(as), (unsigned long)regs->start, + irq); + + return 0; + +out_free_dma: + pm_runtime_disable(&pdev->dev); + pm_runtime_set_suspended(&pdev->dev); + + if (as->use_dma) + atmel_spi_release_dma(master); + + spi_writel(as, CR, SPI_BIT(SWRST)); + spi_writel(as, CR, SPI_BIT(SWRST)); /* AT91SAM9263 Rev B workaround */ + clk_disable_unprepare(clk); +out_free_irq: +out_unmap_regs: + spi_master_put(master); + return ret; +} + +static int atmel_spi_remove(struct platform_device *pdev) +{ + struct spi_master *master = platform_get_drvdata(pdev); + struct atmel_spi *as = spi_master_get_devdata(master); + + pm_runtime_get_sync(&pdev->dev); + + /* reset the hardware and block queue progress */ + if (as->use_dma) { + atmel_spi_stop_dma(master); + atmel_spi_release_dma(master); + if (IS_ENABLED(CONFIG_SOC_SAM_V4_V5)) { + dma_free_coherent(&pdev->dev, SPI_MAX_DMA_XFER, + as->addr_tx_bbuf, + as->dma_addr_tx_bbuf); + dma_free_coherent(&pdev->dev, SPI_MAX_DMA_XFER, + as->addr_rx_bbuf, + as->dma_addr_rx_bbuf); + } + } + + spin_lock_irq(&as->lock); + spi_writel(as, CR, SPI_BIT(SWRST)); + spi_writel(as, CR, SPI_BIT(SWRST)); /* AT91SAM9263 Rev B workaround */ + spi_readl(as, SR); + spin_unlock_irq(&as->lock); + + clk_disable_unprepare(as->clk); + + pm_runtime_put_noidle(&pdev->dev); + pm_runtime_disable(&pdev->dev); + + return 0; +} + +#ifdef CONFIG_PM +static int atmel_spi_runtime_suspend(struct device *dev) +{ + struct spi_master *master = dev_get_drvdata(dev); + struct atmel_spi *as = spi_master_get_devdata(master); + + clk_disable_unprepare(as->clk); + pinctrl_pm_select_sleep_state(dev); + + return 0; +} + +static int atmel_spi_runtime_resume(struct device *dev) +{ + struct spi_master *master = dev_get_drvdata(dev); + struct atmel_spi *as = spi_master_get_devdata(master); + + pinctrl_pm_select_default_state(dev); + + return clk_prepare_enable(as->clk); +} + +#ifdef CONFIG_PM_SLEEP +static int atmel_spi_suspend(struct device *dev) +{ + struct spi_master *master = dev_get_drvdata(dev); + int ret; + + /* Stop the queue running */ + ret = spi_master_suspend(master); + if (ret) + return ret; + + if (!pm_runtime_suspended(dev)) + atmel_spi_runtime_suspend(dev); + + return 0; +} + +static int atmel_spi_resume(struct device *dev) +{ + struct spi_master *master = dev_get_drvdata(dev); + struct atmel_spi *as = spi_master_get_devdata(master); + int ret; + + ret = clk_prepare_enable(as->clk); + if (ret) + return ret; + + atmel_spi_init(as); + + clk_disable_unprepare(as->clk); + + if (!pm_runtime_suspended(dev)) { + ret = atmel_spi_runtime_resume(dev); + if (ret) + return ret; + } + + /* Start the queue running */ + return spi_master_resume(master); +} +#endif + +static const struct dev_pm_ops atmel_spi_pm_ops = { + SET_SYSTEM_SLEEP_PM_OPS(atmel_spi_suspend, atmel_spi_resume) + SET_RUNTIME_PM_OPS(atmel_spi_runtime_suspend, + atmel_spi_runtime_resume, NULL) +}; +#define ATMEL_SPI_PM_OPS (&atmel_spi_pm_ops) +#else +#define ATMEL_SPI_PM_OPS NULL +#endif + +static const struct of_device_id atmel_spi_dt_ids[] = { + { .compatible = "atmel,at91rm9200-spi" }, + { /* sentinel */ } +}; + +MODULE_DEVICE_TABLE(of, atmel_spi_dt_ids); + +static struct platform_driver atmel_spi_driver = { + .driver = { + .name = "atmel_spi", + .pm = ATMEL_SPI_PM_OPS, + .of_match_table = atmel_spi_dt_ids, + }, + .probe = atmel_spi_probe, + .remove = atmel_spi_remove, +}; +module_platform_driver(atmel_spi_driver); + +MODULE_DESCRIPTION("Atmel AT32/AT91 SPI Controller driver"); +MODULE_AUTHOR("Haavard Skinnemoen (Atmel)"); +MODULE_LICENSE("GPL"); +MODULE_ALIAS("platform:atmel_spi"); diff --git a/drivers/spi/spi-au1550.c b/drivers/spi/spi-au1550.c new file mode 100644 index 000000000..dfb7196f4 --- /dev/null +++ b/drivers/spi/spi-au1550.c @@ -0,0 +1,992 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * au1550 psc spi controller driver + * may work also with au1200, au1210, au1250 + * will not work on au1000, au1100 and au1500 (no full spi controller there) + * + * Copyright (c) 2006 ATRON electronic GmbH + * Author: Jan Nikitenko <jan.nikitenko@gmail.com> + */ + +#include <linux/init.h> +#include <linux/interrupt.h> +#include <linux/slab.h> +#include <linux/errno.h> +#include <linux/module.h> +#include <linux/device.h> +#include <linux/platform_device.h> +#include <linux/resource.h> +#include <linux/spi/spi.h> +#include <linux/spi/spi_bitbang.h> +#include <linux/dma-mapping.h> +#include <linux/completion.h> +#include <asm/mach-au1x00/au1000.h> +#include <asm/mach-au1x00/au1xxx_psc.h> +#include <asm/mach-au1x00/au1xxx_dbdma.h> + +#include <asm/mach-au1x00/au1550_spi.h> + +static unsigned usedma = 1; +module_param(usedma, uint, 0644); + +/* +#define AU1550_SPI_DEBUG_LOOPBACK +*/ + + +#define AU1550_SPI_DBDMA_DESCRIPTORS 1 +#define AU1550_SPI_DMA_RXTMP_MINSIZE 2048U + +struct au1550_spi { + struct spi_bitbang bitbang; + + volatile psc_spi_t __iomem *regs; + int irq; + + unsigned len; + unsigned tx_count; + unsigned rx_count; + const u8 *tx; + u8 *rx; + + void (*rx_word)(struct au1550_spi *hw); + void (*tx_word)(struct au1550_spi *hw); + int (*txrx_bufs)(struct spi_device *spi, struct spi_transfer *t); + irqreturn_t (*irq_callback)(struct au1550_spi *hw); + + struct completion master_done; + + unsigned usedma; + u32 dma_tx_id; + u32 dma_rx_id; + u32 dma_tx_ch; + u32 dma_rx_ch; + + u8 *dma_rx_tmpbuf; + unsigned dma_rx_tmpbuf_size; + u32 dma_rx_tmpbuf_addr; + + struct spi_master *master; + struct device *dev; + struct au1550_spi_info *pdata; + struct resource *ioarea; +}; + + +/* we use an 8-bit memory device for dma transfers to/from spi fifo */ +static dbdev_tab_t au1550_spi_mem_dbdev = +{ + .dev_id = DBDMA_MEM_CHAN, + .dev_flags = DEV_FLAGS_ANYUSE|DEV_FLAGS_SYNC, + .dev_tsize = 0, + .dev_devwidth = 8, + .dev_physaddr = 0x00000000, + .dev_intlevel = 0, + .dev_intpolarity = 0 +}; + +static int ddma_memid; /* id to above mem dma device */ + +static void au1550_spi_bits_handlers_set(struct au1550_spi *hw, int bpw); + + +/* + * compute BRG and DIV bits to setup spi clock based on main input clock rate + * that was specified in platform data structure + * according to au1550 datasheet: + * psc_tempclk = psc_mainclk / (2 << DIV) + * spiclk = psc_tempclk / (2 * (BRG + 1)) + * BRG valid range is 4..63 + * DIV valid range is 0..3 + */ +static u32 au1550_spi_baudcfg(struct au1550_spi *hw, unsigned speed_hz) +{ + u32 mainclk_hz = hw->pdata->mainclk_hz; + u32 div, brg; + + for (div = 0; div < 4; div++) { + brg = mainclk_hz / speed_hz / (4 << div); + /* now we have BRG+1 in brg, so count with that */ + if (brg < (4 + 1)) { + brg = (4 + 1); /* speed_hz too big */ + break; /* set lowest brg (div is == 0) */ + } + if (brg <= (63 + 1)) + break; /* we have valid brg and div */ + } + if (div == 4) { + div = 3; /* speed_hz too small */ + brg = (63 + 1); /* set highest brg and div */ + } + brg--; + return PSC_SPICFG_SET_BAUD(brg) | PSC_SPICFG_SET_DIV(div); +} + +static inline void au1550_spi_mask_ack_all(struct au1550_spi *hw) +{ + hw->regs->psc_spimsk = + PSC_SPIMSK_MM | PSC_SPIMSK_RR | PSC_SPIMSK_RO + | PSC_SPIMSK_RU | PSC_SPIMSK_TR | PSC_SPIMSK_TO + | PSC_SPIMSK_TU | PSC_SPIMSK_SD | PSC_SPIMSK_MD; + wmb(); /* drain writebuffer */ + + hw->regs->psc_spievent = + PSC_SPIEVNT_MM | PSC_SPIEVNT_RR | PSC_SPIEVNT_RO + | PSC_SPIEVNT_RU | PSC_SPIEVNT_TR | PSC_SPIEVNT_TO + | PSC_SPIEVNT_TU | PSC_SPIEVNT_SD | PSC_SPIEVNT_MD; + wmb(); /* drain writebuffer */ +} + +static void au1550_spi_reset_fifos(struct au1550_spi *hw) +{ + u32 pcr; + + hw->regs->psc_spipcr = PSC_SPIPCR_RC | PSC_SPIPCR_TC; + wmb(); /* drain writebuffer */ + do { + pcr = hw->regs->psc_spipcr; + wmb(); /* drain writebuffer */ + } while (pcr != 0); +} + +/* + * dma transfers are used for the most common spi word size of 8-bits + * we cannot easily change already set up dma channels' width, so if we wanted + * dma support for more than 8-bit words (up to 24 bits), we would need to + * setup dma channels from scratch on each spi transfer, based on bits_per_word + * instead we have pre set up 8 bit dma channels supporting spi 4 to 8 bits + * transfers, and 9 to 24 bits spi transfers will be done in pio irq based mode + * callbacks to handle dma or pio are set up in au1550_spi_bits_handlers_set() + */ +static void au1550_spi_chipsel(struct spi_device *spi, int value) +{ + struct au1550_spi *hw = spi_master_get_devdata(spi->master); + unsigned cspol = spi->mode & SPI_CS_HIGH ? 1 : 0; + u32 cfg, stat; + + switch (value) { + case BITBANG_CS_INACTIVE: + if (hw->pdata->deactivate_cs) + hw->pdata->deactivate_cs(hw->pdata, spi->chip_select, + cspol); + break; + + case BITBANG_CS_ACTIVE: + au1550_spi_bits_handlers_set(hw, spi->bits_per_word); + + cfg = hw->regs->psc_spicfg; + wmb(); /* drain writebuffer */ + hw->regs->psc_spicfg = cfg & ~PSC_SPICFG_DE_ENABLE; + wmb(); /* drain writebuffer */ + + if (spi->mode & SPI_CPOL) + cfg |= PSC_SPICFG_BI; + else + cfg &= ~PSC_SPICFG_BI; + if (spi->mode & SPI_CPHA) + cfg &= ~PSC_SPICFG_CDE; + else + cfg |= PSC_SPICFG_CDE; + + if (spi->mode & SPI_LSB_FIRST) + cfg |= PSC_SPICFG_MLF; + else + cfg &= ~PSC_SPICFG_MLF; + + if (hw->usedma && spi->bits_per_word <= 8) + cfg &= ~PSC_SPICFG_DD_DISABLE; + else + cfg |= PSC_SPICFG_DD_DISABLE; + cfg = PSC_SPICFG_CLR_LEN(cfg); + cfg |= PSC_SPICFG_SET_LEN(spi->bits_per_word); + + cfg = PSC_SPICFG_CLR_BAUD(cfg); + cfg &= ~PSC_SPICFG_SET_DIV(3); + cfg |= au1550_spi_baudcfg(hw, spi->max_speed_hz); + + hw->regs->psc_spicfg = cfg | PSC_SPICFG_DE_ENABLE; + wmb(); /* drain writebuffer */ + do { + stat = hw->regs->psc_spistat; + wmb(); /* drain writebuffer */ + } while ((stat & PSC_SPISTAT_DR) == 0); + + if (hw->pdata->activate_cs) + hw->pdata->activate_cs(hw->pdata, spi->chip_select, + cspol); + break; + } +} + +static int au1550_spi_setupxfer(struct spi_device *spi, struct spi_transfer *t) +{ + struct au1550_spi *hw = spi_master_get_devdata(spi->master); + unsigned bpw, hz; + u32 cfg, stat; + + if (t) { + bpw = t->bits_per_word; + hz = t->speed_hz; + } else { + bpw = spi->bits_per_word; + hz = spi->max_speed_hz; + } + + if (!hz) + return -EINVAL; + + au1550_spi_bits_handlers_set(hw, spi->bits_per_word); + + cfg = hw->regs->psc_spicfg; + wmb(); /* drain writebuffer */ + hw->regs->psc_spicfg = cfg & ~PSC_SPICFG_DE_ENABLE; + wmb(); /* drain writebuffer */ + + if (hw->usedma && bpw <= 8) + cfg &= ~PSC_SPICFG_DD_DISABLE; + else + cfg |= PSC_SPICFG_DD_DISABLE; + cfg = PSC_SPICFG_CLR_LEN(cfg); + cfg |= PSC_SPICFG_SET_LEN(bpw); + + cfg = PSC_SPICFG_CLR_BAUD(cfg); + cfg &= ~PSC_SPICFG_SET_DIV(3); + cfg |= au1550_spi_baudcfg(hw, hz); + + hw->regs->psc_spicfg = cfg; + wmb(); /* drain writebuffer */ + + if (cfg & PSC_SPICFG_DE_ENABLE) { + do { + stat = hw->regs->psc_spistat; + wmb(); /* drain writebuffer */ + } while ((stat & PSC_SPISTAT_DR) == 0); + } + + au1550_spi_reset_fifos(hw); + au1550_spi_mask_ack_all(hw); + return 0; +} + +/* + * for dma spi transfers, we have to setup rx channel, otherwise there is + * no reliable way how to recognize that spi transfer is done + * dma complete callbacks are called before real spi transfer is finished + * and if only tx dma channel is set up (and rx fifo overflow event masked) + * spi master done event irq is not generated unless rx fifo is empty (emptied) + * so we need rx tmp buffer to use for rx dma if user does not provide one + */ +static int au1550_spi_dma_rxtmp_alloc(struct au1550_spi *hw, unsigned size) +{ + hw->dma_rx_tmpbuf = kmalloc(size, GFP_KERNEL); + if (!hw->dma_rx_tmpbuf) + return -ENOMEM; + hw->dma_rx_tmpbuf_size = size; + hw->dma_rx_tmpbuf_addr = dma_map_single(hw->dev, hw->dma_rx_tmpbuf, + size, DMA_FROM_DEVICE); + if (dma_mapping_error(hw->dev, hw->dma_rx_tmpbuf_addr)) { + kfree(hw->dma_rx_tmpbuf); + hw->dma_rx_tmpbuf = 0; + hw->dma_rx_tmpbuf_size = 0; + return -EFAULT; + } + return 0; +} + +static void au1550_spi_dma_rxtmp_free(struct au1550_spi *hw) +{ + dma_unmap_single(hw->dev, hw->dma_rx_tmpbuf_addr, + hw->dma_rx_tmpbuf_size, DMA_FROM_DEVICE); + kfree(hw->dma_rx_tmpbuf); + hw->dma_rx_tmpbuf = 0; + hw->dma_rx_tmpbuf_size = 0; +} + +static int au1550_spi_dma_txrxb(struct spi_device *spi, struct spi_transfer *t) +{ + struct au1550_spi *hw = spi_master_get_devdata(spi->master); + dma_addr_t dma_tx_addr; + dma_addr_t dma_rx_addr; + u32 res; + + hw->len = t->len; + hw->tx_count = 0; + hw->rx_count = 0; + + hw->tx = t->tx_buf; + hw->rx = t->rx_buf; + dma_tx_addr = t->tx_dma; + dma_rx_addr = t->rx_dma; + + /* + * check if buffers are already dma mapped, map them otherwise: + * - first map the TX buffer, so cache data gets written to memory + * - then map the RX buffer, so that cache entries (with + * soon-to-be-stale data) get removed + * use rx buffer in place of tx if tx buffer was not provided + * use temp rx buffer (preallocated or realloc to fit) for rx dma + */ + if (t->tx_buf) { + if (t->tx_dma == 0) { /* if DMA_ADDR_INVALID, map it */ + dma_tx_addr = dma_map_single(hw->dev, + (void *)t->tx_buf, + t->len, DMA_TO_DEVICE); + if (dma_mapping_error(hw->dev, dma_tx_addr)) + dev_err(hw->dev, "tx dma map error\n"); + } + } + + if (t->rx_buf) { + if (t->rx_dma == 0) { /* if DMA_ADDR_INVALID, map it */ + dma_rx_addr = dma_map_single(hw->dev, + (void *)t->rx_buf, + t->len, DMA_FROM_DEVICE); + if (dma_mapping_error(hw->dev, dma_rx_addr)) + dev_err(hw->dev, "rx dma map error\n"); + } + } else { + if (t->len > hw->dma_rx_tmpbuf_size) { + int ret; + + au1550_spi_dma_rxtmp_free(hw); + ret = au1550_spi_dma_rxtmp_alloc(hw, max(t->len, + AU1550_SPI_DMA_RXTMP_MINSIZE)); + if (ret < 0) + return ret; + } + hw->rx = hw->dma_rx_tmpbuf; + dma_rx_addr = hw->dma_rx_tmpbuf_addr; + dma_sync_single_for_device(hw->dev, dma_rx_addr, + t->len, DMA_FROM_DEVICE); + } + + if (!t->tx_buf) { + dma_sync_single_for_device(hw->dev, dma_rx_addr, + t->len, DMA_BIDIRECTIONAL); + hw->tx = hw->rx; + } + + /* put buffers on the ring */ + res = au1xxx_dbdma_put_dest(hw->dma_rx_ch, virt_to_phys(hw->rx), + t->len, DDMA_FLAGS_IE); + if (!res) + dev_err(hw->dev, "rx dma put dest error\n"); + + res = au1xxx_dbdma_put_source(hw->dma_tx_ch, virt_to_phys(hw->tx), + t->len, DDMA_FLAGS_IE); + if (!res) + dev_err(hw->dev, "tx dma put source error\n"); + + au1xxx_dbdma_start(hw->dma_rx_ch); + au1xxx_dbdma_start(hw->dma_tx_ch); + + /* by default enable nearly all events interrupt */ + hw->regs->psc_spimsk = PSC_SPIMSK_SD; + wmb(); /* drain writebuffer */ + + /* start the transfer */ + hw->regs->psc_spipcr = PSC_SPIPCR_MS; + wmb(); /* drain writebuffer */ + + wait_for_completion(&hw->master_done); + + au1xxx_dbdma_stop(hw->dma_tx_ch); + au1xxx_dbdma_stop(hw->dma_rx_ch); + + if (!t->rx_buf) { + /* using the temporal preallocated and premapped buffer */ + dma_sync_single_for_cpu(hw->dev, dma_rx_addr, t->len, + DMA_FROM_DEVICE); + } + /* unmap buffers if mapped above */ + if (t->rx_buf && t->rx_dma == 0 ) + dma_unmap_single(hw->dev, dma_rx_addr, t->len, + DMA_FROM_DEVICE); + if (t->tx_buf && t->tx_dma == 0 ) + dma_unmap_single(hw->dev, dma_tx_addr, t->len, + DMA_TO_DEVICE); + + return hw->rx_count < hw->tx_count ? hw->rx_count : hw->tx_count; +} + +static irqreturn_t au1550_spi_dma_irq_callback(struct au1550_spi *hw) +{ + u32 stat, evnt; + + stat = hw->regs->psc_spistat; + evnt = hw->regs->psc_spievent; + wmb(); /* drain writebuffer */ + if ((stat & PSC_SPISTAT_DI) == 0) { + dev_err(hw->dev, "Unexpected IRQ!\n"); + return IRQ_NONE; + } + + if ((evnt & (PSC_SPIEVNT_MM | PSC_SPIEVNT_RO + | PSC_SPIEVNT_RU | PSC_SPIEVNT_TO + | PSC_SPIEVNT_TU | PSC_SPIEVNT_SD)) + != 0) { + /* + * due to an spi error we consider transfer as done, + * so mask all events until before next transfer start + * and stop the possibly running dma immediately + */ + au1550_spi_mask_ack_all(hw); + au1xxx_dbdma_stop(hw->dma_rx_ch); + au1xxx_dbdma_stop(hw->dma_tx_ch); + + /* get number of transferred bytes */ + hw->rx_count = hw->len - au1xxx_get_dma_residue(hw->dma_rx_ch); + hw->tx_count = hw->len - au1xxx_get_dma_residue(hw->dma_tx_ch); + + au1xxx_dbdma_reset(hw->dma_rx_ch); + au1xxx_dbdma_reset(hw->dma_tx_ch); + au1550_spi_reset_fifos(hw); + + if (evnt == PSC_SPIEVNT_RO) + dev_err(hw->dev, + "dma transfer: receive FIFO overflow!\n"); + else + dev_err(hw->dev, + "dma transfer: unexpected SPI error " + "(event=0x%x stat=0x%x)!\n", evnt, stat); + + complete(&hw->master_done); + return IRQ_HANDLED; + } + + if ((evnt & PSC_SPIEVNT_MD) != 0) { + /* transfer completed successfully */ + au1550_spi_mask_ack_all(hw); + hw->rx_count = hw->len; + hw->tx_count = hw->len; + complete(&hw->master_done); + } + return IRQ_HANDLED; +} + + +/* routines to handle different word sizes in pio mode */ +#define AU1550_SPI_RX_WORD(size, mask) \ +static void au1550_spi_rx_word_##size(struct au1550_spi *hw) \ +{ \ + u32 fifoword = hw->regs->psc_spitxrx & (u32)(mask); \ + wmb(); /* drain writebuffer */ \ + if (hw->rx) { \ + *(u##size *)hw->rx = (u##size)fifoword; \ + hw->rx += (size) / 8; \ + } \ + hw->rx_count += (size) / 8; \ +} + +#define AU1550_SPI_TX_WORD(size, mask) \ +static void au1550_spi_tx_word_##size(struct au1550_spi *hw) \ +{ \ + u32 fifoword = 0; \ + if (hw->tx) { \ + fifoword = *(u##size *)hw->tx & (u32)(mask); \ + hw->tx += (size) / 8; \ + } \ + hw->tx_count += (size) / 8; \ + if (hw->tx_count >= hw->len) \ + fifoword |= PSC_SPITXRX_LC; \ + hw->regs->psc_spitxrx = fifoword; \ + wmb(); /* drain writebuffer */ \ +} + +AU1550_SPI_RX_WORD(8,0xff) +AU1550_SPI_RX_WORD(16,0xffff) +AU1550_SPI_RX_WORD(32,0xffffff) +AU1550_SPI_TX_WORD(8,0xff) +AU1550_SPI_TX_WORD(16,0xffff) +AU1550_SPI_TX_WORD(32,0xffffff) + +static int au1550_spi_pio_txrxb(struct spi_device *spi, struct spi_transfer *t) +{ + u32 stat, mask; + struct au1550_spi *hw = spi_master_get_devdata(spi->master); + + hw->tx = t->tx_buf; + hw->rx = t->rx_buf; + hw->len = t->len; + hw->tx_count = 0; + hw->rx_count = 0; + + /* by default enable nearly all events after filling tx fifo */ + mask = PSC_SPIMSK_SD; + + /* fill the transmit FIFO */ + while (hw->tx_count < hw->len) { + + hw->tx_word(hw); + + if (hw->tx_count >= hw->len) { + /* mask tx fifo request interrupt as we are done */ + mask |= PSC_SPIMSK_TR; + } + + stat = hw->regs->psc_spistat; + wmb(); /* drain writebuffer */ + if (stat & PSC_SPISTAT_TF) + break; + } + + /* enable event interrupts */ + hw->regs->psc_spimsk = mask; + wmb(); /* drain writebuffer */ + + /* start the transfer */ + hw->regs->psc_spipcr = PSC_SPIPCR_MS; + wmb(); /* drain writebuffer */ + + wait_for_completion(&hw->master_done); + + return hw->rx_count < hw->tx_count ? hw->rx_count : hw->tx_count; +} + +static irqreturn_t au1550_spi_pio_irq_callback(struct au1550_spi *hw) +{ + int busy; + u32 stat, evnt; + + stat = hw->regs->psc_spistat; + evnt = hw->regs->psc_spievent; + wmb(); /* drain writebuffer */ + if ((stat & PSC_SPISTAT_DI) == 0) { + dev_err(hw->dev, "Unexpected IRQ!\n"); + return IRQ_NONE; + } + + if ((evnt & (PSC_SPIEVNT_MM | PSC_SPIEVNT_RO + | PSC_SPIEVNT_RU | PSC_SPIEVNT_TO + | PSC_SPIEVNT_SD)) + != 0) { + /* + * due to an error we consider transfer as done, + * so mask all events until before next transfer start + */ + au1550_spi_mask_ack_all(hw); + au1550_spi_reset_fifos(hw); + dev_err(hw->dev, + "pio transfer: unexpected SPI error " + "(event=0x%x stat=0x%x)!\n", evnt, stat); + complete(&hw->master_done); + return IRQ_HANDLED; + } + + /* + * while there is something to read from rx fifo + * or there is a space to write to tx fifo: + */ + do { + busy = 0; + stat = hw->regs->psc_spistat; + wmb(); /* drain writebuffer */ + + /* + * Take care to not let the Rx FIFO overflow. + * + * We only write a byte if we have read one at least. Initially, + * the write fifo is full, so we should read from the read fifo + * first. + * In case we miss a word from the read fifo, we should get a + * RO event and should back out. + */ + if (!(stat & PSC_SPISTAT_RE) && hw->rx_count < hw->len) { + hw->rx_word(hw); + busy = 1; + + if (!(stat & PSC_SPISTAT_TF) && hw->tx_count < hw->len) + hw->tx_word(hw); + } + } while (busy); + + hw->regs->psc_spievent = PSC_SPIEVNT_RR | PSC_SPIEVNT_TR; + wmb(); /* drain writebuffer */ + + /* + * Restart the SPI transmission in case of a transmit underflow. + * This seems to work despite the notes in the Au1550 data book + * of Figure 8-4 with flowchart for SPI master operation: + * + * """Note 1: An XFR Error Interrupt occurs, unless masked, + * for any of the following events: Tx FIFO Underflow, + * Rx FIFO Overflow, or Multiple-master Error + * Note 2: In case of a Tx Underflow Error, all zeroes are + * transmitted.""" + * + * By simply restarting the spi transfer on Tx Underflow Error, + * we assume that spi transfer was paused instead of zeroes + * transmittion mentioned in the Note 2 of Au1550 data book. + */ + if (evnt & PSC_SPIEVNT_TU) { + hw->regs->psc_spievent = PSC_SPIEVNT_TU | PSC_SPIEVNT_MD; + wmb(); /* drain writebuffer */ + hw->regs->psc_spipcr = PSC_SPIPCR_MS; + wmb(); /* drain writebuffer */ + } + + if (hw->rx_count >= hw->len) { + /* transfer completed successfully */ + au1550_spi_mask_ack_all(hw); + complete(&hw->master_done); + } + return IRQ_HANDLED; +} + +static int au1550_spi_txrx_bufs(struct spi_device *spi, struct spi_transfer *t) +{ + struct au1550_spi *hw = spi_master_get_devdata(spi->master); + return hw->txrx_bufs(spi, t); +} + +static irqreturn_t au1550_spi_irq(int irq, void *dev) +{ + struct au1550_spi *hw = dev; + return hw->irq_callback(hw); +} + +static void au1550_spi_bits_handlers_set(struct au1550_spi *hw, int bpw) +{ + if (bpw <= 8) { + if (hw->usedma) { + hw->txrx_bufs = &au1550_spi_dma_txrxb; + hw->irq_callback = &au1550_spi_dma_irq_callback; + } else { + hw->rx_word = &au1550_spi_rx_word_8; + hw->tx_word = &au1550_spi_tx_word_8; + hw->txrx_bufs = &au1550_spi_pio_txrxb; + hw->irq_callback = &au1550_spi_pio_irq_callback; + } + } else if (bpw <= 16) { + hw->rx_word = &au1550_spi_rx_word_16; + hw->tx_word = &au1550_spi_tx_word_16; + hw->txrx_bufs = &au1550_spi_pio_txrxb; + hw->irq_callback = &au1550_spi_pio_irq_callback; + } else { + hw->rx_word = &au1550_spi_rx_word_32; + hw->tx_word = &au1550_spi_tx_word_32; + hw->txrx_bufs = &au1550_spi_pio_txrxb; + hw->irq_callback = &au1550_spi_pio_irq_callback; + } +} + +static void au1550_spi_setup_psc_as_spi(struct au1550_spi *hw) +{ + u32 stat, cfg; + + /* set up the PSC for SPI mode */ + hw->regs->psc_ctrl = PSC_CTRL_DISABLE; + wmb(); /* drain writebuffer */ + hw->regs->psc_sel = PSC_SEL_PS_SPIMODE; + wmb(); /* drain writebuffer */ + + hw->regs->psc_spicfg = 0; + wmb(); /* drain writebuffer */ + + hw->regs->psc_ctrl = PSC_CTRL_ENABLE; + wmb(); /* drain writebuffer */ + + do { + stat = hw->regs->psc_spistat; + wmb(); /* drain writebuffer */ + } while ((stat & PSC_SPISTAT_SR) == 0); + + + cfg = hw->usedma ? 0 : PSC_SPICFG_DD_DISABLE; + cfg |= PSC_SPICFG_SET_LEN(8); + cfg |= PSC_SPICFG_RT_FIFO8 | PSC_SPICFG_TT_FIFO8; + /* use minimal allowed brg and div values as initial setting: */ + cfg |= PSC_SPICFG_SET_BAUD(4) | PSC_SPICFG_SET_DIV(0); + +#ifdef AU1550_SPI_DEBUG_LOOPBACK + cfg |= PSC_SPICFG_LB; +#endif + + hw->regs->psc_spicfg = cfg; + wmb(); /* drain writebuffer */ + + au1550_spi_mask_ack_all(hw); + + hw->regs->psc_spicfg |= PSC_SPICFG_DE_ENABLE; + wmb(); /* drain writebuffer */ + + do { + stat = hw->regs->psc_spistat; + wmb(); /* drain writebuffer */ + } while ((stat & PSC_SPISTAT_DR) == 0); + + au1550_spi_reset_fifos(hw); +} + + +static int au1550_spi_probe(struct platform_device *pdev) +{ + struct au1550_spi *hw; + struct spi_master *master; + struct resource *r; + int err = 0; + + master = spi_alloc_master(&pdev->dev, sizeof(struct au1550_spi)); + if (master == NULL) { + dev_err(&pdev->dev, "No memory for spi_master\n"); + err = -ENOMEM; + goto err_nomem; + } + + /* the spi->mode bits understood by this driver: */ + master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH | SPI_LSB_FIRST; + master->bits_per_word_mask = SPI_BPW_RANGE_MASK(4, 24); + + hw = spi_master_get_devdata(master); + + hw->master = master; + hw->pdata = dev_get_platdata(&pdev->dev); + hw->dev = &pdev->dev; + + if (hw->pdata == NULL) { + dev_err(&pdev->dev, "No platform data supplied\n"); + err = -ENOENT; + goto err_no_pdata; + } + + r = platform_get_resource(pdev, IORESOURCE_IRQ, 0); + if (!r) { + dev_err(&pdev->dev, "no IRQ\n"); + err = -ENODEV; + goto err_no_iores; + } + hw->irq = r->start; + + hw->usedma = 0; + r = platform_get_resource(pdev, IORESOURCE_DMA, 0); + if (r) { + hw->dma_tx_id = r->start; + r = platform_get_resource(pdev, IORESOURCE_DMA, 1); + if (r) { + hw->dma_rx_id = r->start; + if (usedma && ddma_memid) { + if (pdev->dev.dma_mask == NULL) + dev_warn(&pdev->dev, "no dma mask\n"); + else + hw->usedma = 1; + } + } + } + + r = platform_get_resource(pdev, IORESOURCE_MEM, 0); + if (!r) { + dev_err(&pdev->dev, "no mmio resource\n"); + err = -ENODEV; + goto err_no_iores; + } + + hw->ioarea = request_mem_region(r->start, sizeof(psc_spi_t), + pdev->name); + if (!hw->ioarea) { + dev_err(&pdev->dev, "Cannot reserve iomem region\n"); + err = -ENXIO; + goto err_no_iores; + } + + hw->regs = (psc_spi_t __iomem *)ioremap(r->start, sizeof(psc_spi_t)); + if (!hw->regs) { + dev_err(&pdev->dev, "cannot ioremap\n"); + err = -ENXIO; + goto err_ioremap; + } + + platform_set_drvdata(pdev, hw); + + init_completion(&hw->master_done); + + hw->bitbang.master = hw->master; + hw->bitbang.setup_transfer = au1550_spi_setupxfer; + hw->bitbang.chipselect = au1550_spi_chipsel; + hw->bitbang.txrx_bufs = au1550_spi_txrx_bufs; + + if (hw->usedma) { + hw->dma_tx_ch = au1xxx_dbdma_chan_alloc(ddma_memid, + hw->dma_tx_id, NULL, (void *)hw); + if (hw->dma_tx_ch == 0) { + dev_err(&pdev->dev, + "Cannot allocate tx dma channel\n"); + err = -ENXIO; + goto err_no_txdma; + } + au1xxx_dbdma_set_devwidth(hw->dma_tx_ch, 8); + if (au1xxx_dbdma_ring_alloc(hw->dma_tx_ch, + AU1550_SPI_DBDMA_DESCRIPTORS) == 0) { + dev_err(&pdev->dev, + "Cannot allocate tx dma descriptors\n"); + err = -ENXIO; + goto err_no_txdma_descr; + } + + + hw->dma_rx_ch = au1xxx_dbdma_chan_alloc(hw->dma_rx_id, + ddma_memid, NULL, (void *)hw); + if (hw->dma_rx_ch == 0) { + dev_err(&pdev->dev, + "Cannot allocate rx dma channel\n"); + err = -ENXIO; + goto err_no_rxdma; + } + au1xxx_dbdma_set_devwidth(hw->dma_rx_ch, 8); + if (au1xxx_dbdma_ring_alloc(hw->dma_rx_ch, + AU1550_SPI_DBDMA_DESCRIPTORS) == 0) { + dev_err(&pdev->dev, + "Cannot allocate rx dma descriptors\n"); + err = -ENXIO; + goto err_no_rxdma_descr; + } + + err = au1550_spi_dma_rxtmp_alloc(hw, + AU1550_SPI_DMA_RXTMP_MINSIZE); + if (err < 0) { + dev_err(&pdev->dev, + "Cannot allocate initial rx dma tmp buffer\n"); + goto err_dma_rxtmp_alloc; + } + } + + au1550_spi_bits_handlers_set(hw, 8); + + err = request_irq(hw->irq, au1550_spi_irq, 0, pdev->name, hw); + if (err) { + dev_err(&pdev->dev, "Cannot claim IRQ\n"); + goto err_no_irq; + } + + master->bus_num = pdev->id; + master->num_chipselect = hw->pdata->num_chipselect; + + /* + * precompute valid range for spi freq - from au1550 datasheet: + * psc_tempclk = psc_mainclk / (2 << DIV) + * spiclk = psc_tempclk / (2 * (BRG + 1)) + * BRG valid range is 4..63 + * DIV valid range is 0..3 + * round the min and max frequencies to values that would still + * produce valid brg and div + */ + { + int min_div = (2 << 0) * (2 * (4 + 1)); + int max_div = (2 << 3) * (2 * (63 + 1)); + master->max_speed_hz = hw->pdata->mainclk_hz / min_div; + master->min_speed_hz = + hw->pdata->mainclk_hz / (max_div + 1) + 1; + } + + au1550_spi_setup_psc_as_spi(hw); + + err = spi_bitbang_start(&hw->bitbang); + if (err) { + dev_err(&pdev->dev, "Failed to register SPI master\n"); + goto err_register; + } + + dev_info(&pdev->dev, + "spi master registered: bus_num=%d num_chipselect=%d\n", + master->bus_num, master->num_chipselect); + + return 0; + +err_register: + free_irq(hw->irq, hw); + +err_no_irq: + au1550_spi_dma_rxtmp_free(hw); + +err_dma_rxtmp_alloc: +err_no_rxdma_descr: + if (hw->usedma) + au1xxx_dbdma_chan_free(hw->dma_rx_ch); + +err_no_rxdma: +err_no_txdma_descr: + if (hw->usedma) + au1xxx_dbdma_chan_free(hw->dma_tx_ch); + +err_no_txdma: + iounmap((void __iomem *)hw->regs); + +err_ioremap: + release_mem_region(r->start, sizeof(psc_spi_t)); + +err_no_iores: +err_no_pdata: + spi_master_put(hw->master); + +err_nomem: + return err; +} + +static int au1550_spi_remove(struct platform_device *pdev) +{ + struct au1550_spi *hw = platform_get_drvdata(pdev); + + dev_info(&pdev->dev, "spi master remove: bus_num=%d\n", + hw->master->bus_num); + + spi_bitbang_stop(&hw->bitbang); + free_irq(hw->irq, hw); + iounmap((void __iomem *)hw->regs); + release_mem_region(hw->ioarea->start, sizeof(psc_spi_t)); + + if (hw->usedma) { + au1550_spi_dma_rxtmp_free(hw); + au1xxx_dbdma_chan_free(hw->dma_rx_ch); + au1xxx_dbdma_chan_free(hw->dma_tx_ch); + } + + spi_master_put(hw->master); + return 0; +} + +/* work with hotplug and coldplug */ +MODULE_ALIAS("platform:au1550-spi"); + +static struct platform_driver au1550_spi_drv = { + .probe = au1550_spi_probe, + .remove = au1550_spi_remove, + .driver = { + .name = "au1550-spi", + }, +}; + +static int __init au1550_spi_init(void) +{ + /* + * create memory device with 8 bits dev_devwidth + * needed for proper byte ordering to spi fifo + */ + switch (alchemy_get_cputype()) { + case ALCHEMY_CPU_AU1550: + case ALCHEMY_CPU_AU1200: + case ALCHEMY_CPU_AU1300: + break; + default: + return -ENODEV; + } + + if (usedma) { + ddma_memid = au1xxx_ddma_add_device(&au1550_spi_mem_dbdev); + if (!ddma_memid) + printk(KERN_ERR "au1550-spi: cannot add memory" + "dbdma device\n"); + } + return platform_driver_register(&au1550_spi_drv); +} +module_init(au1550_spi_init); + +static void __exit au1550_spi_exit(void) +{ + if (usedma && ddma_memid) + au1xxx_ddma_del_device(ddma_memid); + platform_driver_unregister(&au1550_spi_drv); +} +module_exit(au1550_spi_exit); + +MODULE_DESCRIPTION("Au1550 PSC SPI Driver"); +MODULE_AUTHOR("Jan Nikitenko <jan.nikitenko@gmail.com>"); +MODULE_LICENSE("GPL"); diff --git a/drivers/spi/spi-axi-spi-engine.c b/drivers/spi/spi-axi-spi-engine.c new file mode 100644 index 000000000..af86e6d6e --- /dev/null +++ b/drivers/spi/spi-axi-spi-engine.c @@ -0,0 +1,601 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * SPI-Engine SPI controller driver + * Copyright 2015 Analog Devices Inc. + * Author: Lars-Peter Clausen <lars@metafoo.de> + */ + +#include <linux/clk.h> +#include <linux/interrupt.h> +#include <linux/io.h> +#include <linux/of.h> +#include <linux/module.h> +#include <linux/platform_device.h> +#include <linux/spi/spi.h> + +#define SPI_ENGINE_VERSION_MAJOR(x) ((x >> 16) & 0xff) +#define SPI_ENGINE_VERSION_MINOR(x) ((x >> 8) & 0xff) +#define SPI_ENGINE_VERSION_PATCH(x) (x & 0xff) + +#define SPI_ENGINE_REG_VERSION 0x00 + +#define SPI_ENGINE_REG_RESET 0x40 + +#define SPI_ENGINE_REG_INT_ENABLE 0x80 +#define SPI_ENGINE_REG_INT_PENDING 0x84 +#define SPI_ENGINE_REG_INT_SOURCE 0x88 + +#define SPI_ENGINE_REG_SYNC_ID 0xc0 + +#define SPI_ENGINE_REG_CMD_FIFO_ROOM 0xd0 +#define SPI_ENGINE_REG_SDO_FIFO_ROOM 0xd4 +#define SPI_ENGINE_REG_SDI_FIFO_LEVEL 0xd8 + +#define SPI_ENGINE_REG_CMD_FIFO 0xe0 +#define SPI_ENGINE_REG_SDO_DATA_FIFO 0xe4 +#define SPI_ENGINE_REG_SDI_DATA_FIFO 0xe8 +#define SPI_ENGINE_REG_SDI_DATA_FIFO_PEEK 0xec + +#define SPI_ENGINE_INT_CMD_ALMOST_EMPTY BIT(0) +#define SPI_ENGINE_INT_SDO_ALMOST_EMPTY BIT(1) +#define SPI_ENGINE_INT_SDI_ALMOST_FULL BIT(2) +#define SPI_ENGINE_INT_SYNC BIT(3) + +#define SPI_ENGINE_CONFIG_CPHA BIT(0) +#define SPI_ENGINE_CONFIG_CPOL BIT(1) +#define SPI_ENGINE_CONFIG_3WIRE BIT(2) + +#define SPI_ENGINE_INST_TRANSFER 0x0 +#define SPI_ENGINE_INST_ASSERT 0x1 +#define SPI_ENGINE_INST_WRITE 0x2 +#define SPI_ENGINE_INST_MISC 0x3 + +#define SPI_ENGINE_CMD_REG_CLK_DIV 0x0 +#define SPI_ENGINE_CMD_REG_CONFIG 0x1 + +#define SPI_ENGINE_MISC_SYNC 0x0 +#define SPI_ENGINE_MISC_SLEEP 0x1 + +#define SPI_ENGINE_TRANSFER_WRITE 0x1 +#define SPI_ENGINE_TRANSFER_READ 0x2 + +#define SPI_ENGINE_CMD(inst, arg1, arg2) \ + (((inst) << 12) | ((arg1) << 8) | (arg2)) + +#define SPI_ENGINE_CMD_TRANSFER(flags, n) \ + SPI_ENGINE_CMD(SPI_ENGINE_INST_TRANSFER, (flags), (n)) +#define SPI_ENGINE_CMD_ASSERT(delay, cs) \ + SPI_ENGINE_CMD(SPI_ENGINE_INST_ASSERT, (delay), (cs)) +#define SPI_ENGINE_CMD_WRITE(reg, val) \ + SPI_ENGINE_CMD(SPI_ENGINE_INST_WRITE, (reg), (val)) +#define SPI_ENGINE_CMD_SLEEP(delay) \ + SPI_ENGINE_CMD(SPI_ENGINE_INST_MISC, SPI_ENGINE_MISC_SLEEP, (delay)) +#define SPI_ENGINE_CMD_SYNC(id) \ + SPI_ENGINE_CMD(SPI_ENGINE_INST_MISC, SPI_ENGINE_MISC_SYNC, (id)) + +struct spi_engine_program { + unsigned int length; + uint16_t instructions[]; +}; + +struct spi_engine { + struct clk *clk; + struct clk *ref_clk; + + spinlock_t lock; + + void __iomem *base; + + struct spi_message *msg; + struct spi_engine_program *p; + unsigned cmd_length; + const uint16_t *cmd_buf; + + struct spi_transfer *tx_xfer; + unsigned int tx_length; + const uint8_t *tx_buf; + + struct spi_transfer *rx_xfer; + unsigned int rx_length; + uint8_t *rx_buf; + + unsigned int sync_id; + unsigned int completed_id; + + unsigned int int_enable; +}; + +static void spi_engine_program_add_cmd(struct spi_engine_program *p, + bool dry, uint16_t cmd) +{ + if (!dry) + p->instructions[p->length] = cmd; + p->length++; +} + +static unsigned int spi_engine_get_config(struct spi_device *spi) +{ + unsigned int config = 0; + + if (spi->mode & SPI_CPOL) + config |= SPI_ENGINE_CONFIG_CPOL; + if (spi->mode & SPI_CPHA) + config |= SPI_ENGINE_CONFIG_CPHA; + if (spi->mode & SPI_3WIRE) + config |= SPI_ENGINE_CONFIG_3WIRE; + + return config; +} + +static unsigned int spi_engine_get_clk_div(struct spi_engine *spi_engine, + struct spi_device *spi, struct spi_transfer *xfer) +{ + unsigned int clk_div; + + clk_div = DIV_ROUND_UP(clk_get_rate(spi_engine->ref_clk), + xfer->speed_hz * 2); + if (clk_div > 255) + clk_div = 255; + else if (clk_div > 0) + clk_div -= 1; + + return clk_div; +} + +static void spi_engine_gen_xfer(struct spi_engine_program *p, bool dry, + struct spi_transfer *xfer) +{ + unsigned int len = xfer->len; + + while (len) { + unsigned int n = min(len, 256U); + unsigned int flags = 0; + + if (xfer->tx_buf) + flags |= SPI_ENGINE_TRANSFER_WRITE; + if (xfer->rx_buf) + flags |= SPI_ENGINE_TRANSFER_READ; + + spi_engine_program_add_cmd(p, dry, + SPI_ENGINE_CMD_TRANSFER(flags, n - 1)); + len -= n; + } +} + +static void spi_engine_gen_sleep(struct spi_engine_program *p, bool dry, + struct spi_engine *spi_engine, unsigned int clk_div, + struct spi_transfer *xfer) +{ + unsigned int spi_clk = clk_get_rate(spi_engine->ref_clk); + unsigned int t; + int delay; + + if (xfer->delay_usecs) { + delay = xfer->delay_usecs; + } else { + delay = spi_delay_to_ns(&xfer->delay, xfer); + if (delay < 0) + return; + delay /= 1000; + } + + if (delay == 0) + return; + + t = DIV_ROUND_UP(delay * spi_clk, (clk_div + 1) * 2); + while (t) { + unsigned int n = min(t, 256U); + + spi_engine_program_add_cmd(p, dry, SPI_ENGINE_CMD_SLEEP(n - 1)); + t -= n; + } +} + +static void spi_engine_gen_cs(struct spi_engine_program *p, bool dry, + struct spi_device *spi, bool assert) +{ + unsigned int mask = 0xff; + + if (assert) + mask ^= BIT(spi->chip_select); + + spi_engine_program_add_cmd(p, dry, SPI_ENGINE_CMD_ASSERT(1, mask)); +} + +static int spi_engine_compile_message(struct spi_engine *spi_engine, + struct spi_message *msg, bool dry, struct spi_engine_program *p) +{ + struct spi_device *spi = msg->spi; + struct spi_transfer *xfer; + int clk_div, new_clk_div; + bool cs_change = true; + + clk_div = -1; + + spi_engine_program_add_cmd(p, dry, + SPI_ENGINE_CMD_WRITE(SPI_ENGINE_CMD_REG_CONFIG, + spi_engine_get_config(spi))); + + list_for_each_entry(xfer, &msg->transfers, transfer_list) { + new_clk_div = spi_engine_get_clk_div(spi_engine, spi, xfer); + if (new_clk_div != clk_div) { + clk_div = new_clk_div; + spi_engine_program_add_cmd(p, dry, + SPI_ENGINE_CMD_WRITE(SPI_ENGINE_CMD_REG_CLK_DIV, + clk_div)); + } + + if (cs_change) + spi_engine_gen_cs(p, dry, spi, true); + + spi_engine_gen_xfer(p, dry, xfer); + spi_engine_gen_sleep(p, dry, spi_engine, clk_div, xfer); + + cs_change = xfer->cs_change; + if (list_is_last(&xfer->transfer_list, &msg->transfers)) + cs_change = !cs_change; + + if (cs_change) + spi_engine_gen_cs(p, dry, spi, false); + } + + return 0; +} + +static void spi_engine_xfer_next(struct spi_engine *spi_engine, + struct spi_transfer **_xfer) +{ + struct spi_message *msg = spi_engine->msg; + struct spi_transfer *xfer = *_xfer; + + if (!xfer) { + xfer = list_first_entry(&msg->transfers, + struct spi_transfer, transfer_list); + } else if (list_is_last(&xfer->transfer_list, &msg->transfers)) { + xfer = NULL; + } else { + xfer = list_next_entry(xfer, transfer_list); + } + + *_xfer = xfer; +} + +static void spi_engine_tx_next(struct spi_engine *spi_engine) +{ + struct spi_transfer *xfer = spi_engine->tx_xfer; + + do { + spi_engine_xfer_next(spi_engine, &xfer); + } while (xfer && !xfer->tx_buf); + + spi_engine->tx_xfer = xfer; + if (xfer) { + spi_engine->tx_length = xfer->len; + spi_engine->tx_buf = xfer->tx_buf; + } else { + spi_engine->tx_buf = NULL; + } +} + +static void spi_engine_rx_next(struct spi_engine *spi_engine) +{ + struct spi_transfer *xfer = spi_engine->rx_xfer; + + do { + spi_engine_xfer_next(spi_engine, &xfer); + } while (xfer && !xfer->rx_buf); + + spi_engine->rx_xfer = xfer; + if (xfer) { + spi_engine->rx_length = xfer->len; + spi_engine->rx_buf = xfer->rx_buf; + } else { + spi_engine->rx_buf = NULL; + } +} + +static bool spi_engine_write_cmd_fifo(struct spi_engine *spi_engine) +{ + void __iomem *addr = spi_engine->base + SPI_ENGINE_REG_CMD_FIFO; + unsigned int n, m, i; + const uint16_t *buf; + + n = readl_relaxed(spi_engine->base + SPI_ENGINE_REG_CMD_FIFO_ROOM); + while (n && spi_engine->cmd_length) { + m = min(n, spi_engine->cmd_length); + buf = spi_engine->cmd_buf; + for (i = 0; i < m; i++) + writel_relaxed(buf[i], addr); + spi_engine->cmd_buf += m; + spi_engine->cmd_length -= m; + n -= m; + } + + return spi_engine->cmd_length != 0; +} + +static bool spi_engine_write_tx_fifo(struct spi_engine *spi_engine) +{ + void __iomem *addr = spi_engine->base + SPI_ENGINE_REG_SDO_DATA_FIFO; + unsigned int n, m, i; + const uint8_t *buf; + + n = readl_relaxed(spi_engine->base + SPI_ENGINE_REG_SDO_FIFO_ROOM); + while (n && spi_engine->tx_length) { + m = min(n, spi_engine->tx_length); + buf = spi_engine->tx_buf; + for (i = 0; i < m; i++) + writel_relaxed(buf[i], addr); + spi_engine->tx_buf += m; + spi_engine->tx_length -= m; + n -= m; + if (spi_engine->tx_length == 0) + spi_engine_tx_next(spi_engine); + } + + return spi_engine->tx_length != 0; +} + +static bool spi_engine_read_rx_fifo(struct spi_engine *spi_engine) +{ + void __iomem *addr = spi_engine->base + SPI_ENGINE_REG_SDI_DATA_FIFO; + unsigned int n, m, i; + uint8_t *buf; + + n = readl_relaxed(spi_engine->base + SPI_ENGINE_REG_SDI_FIFO_LEVEL); + while (n && spi_engine->rx_length) { + m = min(n, spi_engine->rx_length); + buf = spi_engine->rx_buf; + for (i = 0; i < m; i++) + buf[i] = readl_relaxed(addr); + spi_engine->rx_buf += m; + spi_engine->rx_length -= m; + n -= m; + if (spi_engine->rx_length == 0) + spi_engine_rx_next(spi_engine); + } + + return spi_engine->rx_length != 0; +} + +static irqreturn_t spi_engine_irq(int irq, void *devid) +{ + struct spi_master *master = devid; + struct spi_engine *spi_engine = spi_master_get_devdata(master); + unsigned int disable_int = 0; + unsigned int pending; + + pending = readl_relaxed(spi_engine->base + SPI_ENGINE_REG_INT_PENDING); + + if (pending & SPI_ENGINE_INT_SYNC) { + writel_relaxed(SPI_ENGINE_INT_SYNC, + spi_engine->base + SPI_ENGINE_REG_INT_PENDING); + spi_engine->completed_id = readl_relaxed( + spi_engine->base + SPI_ENGINE_REG_SYNC_ID); + } + + spin_lock(&spi_engine->lock); + + if (pending & SPI_ENGINE_INT_CMD_ALMOST_EMPTY) { + if (!spi_engine_write_cmd_fifo(spi_engine)) + disable_int |= SPI_ENGINE_INT_CMD_ALMOST_EMPTY; + } + + if (pending & SPI_ENGINE_INT_SDO_ALMOST_EMPTY) { + if (!spi_engine_write_tx_fifo(spi_engine)) + disable_int |= SPI_ENGINE_INT_SDO_ALMOST_EMPTY; + } + + if (pending & (SPI_ENGINE_INT_SDI_ALMOST_FULL | SPI_ENGINE_INT_SYNC)) { + if (!spi_engine_read_rx_fifo(spi_engine)) + disable_int |= SPI_ENGINE_INT_SDI_ALMOST_FULL; + } + + if (pending & SPI_ENGINE_INT_SYNC) { + if (spi_engine->msg && + spi_engine->completed_id == spi_engine->sync_id) { + struct spi_message *msg = spi_engine->msg; + + kfree(spi_engine->p); + msg->status = 0; + msg->actual_length = msg->frame_length; + spi_engine->msg = NULL; + spi_finalize_current_message(master); + disable_int |= SPI_ENGINE_INT_SYNC; + } + } + + if (disable_int) { + spi_engine->int_enable &= ~disable_int; + writel_relaxed(spi_engine->int_enable, + spi_engine->base + SPI_ENGINE_REG_INT_ENABLE); + } + + spin_unlock(&spi_engine->lock); + + return IRQ_HANDLED; +} + +static int spi_engine_transfer_one_message(struct spi_master *master, + struct spi_message *msg) +{ + struct spi_engine_program p_dry, *p; + struct spi_engine *spi_engine = spi_master_get_devdata(master); + unsigned int int_enable = 0; + unsigned long flags; + size_t size; + + p_dry.length = 0; + spi_engine_compile_message(spi_engine, msg, true, &p_dry); + + size = sizeof(*p->instructions) * (p_dry.length + 1); + p = kzalloc(sizeof(*p) + size, GFP_KERNEL); + if (!p) + return -ENOMEM; + spi_engine_compile_message(spi_engine, msg, false, p); + + spin_lock_irqsave(&spi_engine->lock, flags); + spi_engine->sync_id = (spi_engine->sync_id + 1) & 0xff; + spi_engine_program_add_cmd(p, false, + SPI_ENGINE_CMD_SYNC(spi_engine->sync_id)); + + spi_engine->msg = msg; + spi_engine->p = p; + + spi_engine->cmd_buf = p->instructions; + spi_engine->cmd_length = p->length; + if (spi_engine_write_cmd_fifo(spi_engine)) + int_enable |= SPI_ENGINE_INT_CMD_ALMOST_EMPTY; + + spi_engine_tx_next(spi_engine); + if (spi_engine_write_tx_fifo(spi_engine)) + int_enable |= SPI_ENGINE_INT_SDO_ALMOST_EMPTY; + + spi_engine_rx_next(spi_engine); + if (spi_engine->rx_length != 0) + int_enable |= SPI_ENGINE_INT_SDI_ALMOST_FULL; + + int_enable |= SPI_ENGINE_INT_SYNC; + + writel_relaxed(int_enable, + spi_engine->base + SPI_ENGINE_REG_INT_ENABLE); + spi_engine->int_enable = int_enable; + spin_unlock_irqrestore(&spi_engine->lock, flags); + + return 0; +} + +static int spi_engine_probe(struct platform_device *pdev) +{ + struct spi_engine *spi_engine; + struct spi_master *master; + unsigned int version; + int irq; + int ret; + + irq = platform_get_irq(pdev, 0); + if (irq <= 0) + return -ENXIO; + + spi_engine = devm_kzalloc(&pdev->dev, sizeof(*spi_engine), GFP_KERNEL); + if (!spi_engine) + return -ENOMEM; + + master = spi_alloc_master(&pdev->dev, 0); + if (!master) + return -ENOMEM; + + spi_master_set_devdata(master, spi_engine); + + spin_lock_init(&spi_engine->lock); + + spi_engine->clk = devm_clk_get(&pdev->dev, "s_axi_aclk"); + if (IS_ERR(spi_engine->clk)) { + ret = PTR_ERR(spi_engine->clk); + goto err_put_master; + } + + spi_engine->ref_clk = devm_clk_get(&pdev->dev, "spi_clk"); + if (IS_ERR(spi_engine->ref_clk)) { + ret = PTR_ERR(spi_engine->ref_clk); + goto err_put_master; + } + + ret = clk_prepare_enable(spi_engine->clk); + if (ret) + goto err_put_master; + + ret = clk_prepare_enable(spi_engine->ref_clk); + if (ret) + goto err_clk_disable; + + spi_engine->base = devm_platform_ioremap_resource(pdev, 0); + if (IS_ERR(spi_engine->base)) { + ret = PTR_ERR(spi_engine->base); + goto err_ref_clk_disable; + } + + version = readl(spi_engine->base + SPI_ENGINE_REG_VERSION); + if (SPI_ENGINE_VERSION_MAJOR(version) != 1) { + dev_err(&pdev->dev, "Unsupported peripheral version %u.%u.%c\n", + SPI_ENGINE_VERSION_MAJOR(version), + SPI_ENGINE_VERSION_MINOR(version), + SPI_ENGINE_VERSION_PATCH(version)); + ret = -ENODEV; + goto err_ref_clk_disable; + } + + writel_relaxed(0x00, spi_engine->base + SPI_ENGINE_REG_RESET); + writel_relaxed(0xff, spi_engine->base + SPI_ENGINE_REG_INT_PENDING); + writel_relaxed(0x00, spi_engine->base + SPI_ENGINE_REG_INT_ENABLE); + + ret = request_irq(irq, spi_engine_irq, 0, pdev->name, master); + if (ret) + goto err_ref_clk_disable; + + master->dev.of_node = pdev->dev.of_node; + master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_3WIRE; + master->bits_per_word_mask = SPI_BPW_MASK(8); + master->max_speed_hz = clk_get_rate(spi_engine->ref_clk) / 2; + master->transfer_one_message = spi_engine_transfer_one_message; + master->num_chipselect = 8; + + ret = spi_register_master(master); + if (ret) + goto err_free_irq; + + platform_set_drvdata(pdev, master); + + return 0; +err_free_irq: + free_irq(irq, master); +err_ref_clk_disable: + clk_disable_unprepare(spi_engine->ref_clk); +err_clk_disable: + clk_disable_unprepare(spi_engine->clk); +err_put_master: + spi_master_put(master); + return ret; +} + +static int spi_engine_remove(struct platform_device *pdev) +{ + struct spi_master *master = spi_master_get(platform_get_drvdata(pdev)); + struct spi_engine *spi_engine = spi_master_get_devdata(master); + int irq = platform_get_irq(pdev, 0); + + spi_unregister_master(master); + + free_irq(irq, master); + + spi_master_put(master); + + writel_relaxed(0xff, spi_engine->base + SPI_ENGINE_REG_INT_PENDING); + writel_relaxed(0x00, spi_engine->base + SPI_ENGINE_REG_INT_ENABLE); + writel_relaxed(0x01, spi_engine->base + SPI_ENGINE_REG_RESET); + + clk_disable_unprepare(spi_engine->ref_clk); + clk_disable_unprepare(spi_engine->clk); + + return 0; +} + +static const struct of_device_id spi_engine_match_table[] = { + { .compatible = "adi,axi-spi-engine-1.00.a" }, + { }, +}; +MODULE_DEVICE_TABLE(of, spi_engine_match_table); + +static struct platform_driver spi_engine_driver = { + .probe = spi_engine_probe, + .remove = spi_engine_remove, + .driver = { + .name = "spi-engine", + .of_match_table = spi_engine_match_table, + }, +}; +module_platform_driver(spi_engine_driver); + +MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>"); +MODULE_DESCRIPTION("Analog Devices SPI engine peripheral driver"); +MODULE_LICENSE("GPL"); diff --git a/drivers/spi/spi-bcm-qspi.c b/drivers/spi/spi-bcm-qspi.c new file mode 100644 index 000000000..2c734ea07 --- /dev/null +++ b/drivers/spi/spi-bcm-qspi.c @@ -0,0 +1,1564 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Driver for Broadcom BRCMSTB, NSP, NS2, Cygnus SPI Controllers + * + * Copyright 2016 Broadcom + */ + +#include <linux/clk.h> +#include <linux/delay.h> +#include <linux/device.h> +#include <linux/init.h> +#include <linux/interrupt.h> +#include <linux/io.h> +#include <linux/ioport.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/of.h> +#include <linux/of_irq.h> +#include <linux/platform_device.h> +#include <linux/slab.h> +#include <linux/spi/spi.h> +#include <linux/spi/spi-mem.h> +#include <linux/sysfs.h> +#include <linux/types.h> +#include "spi-bcm-qspi.h" + +#define DRIVER_NAME "bcm_qspi" + + +/* BSPI register offsets */ +#define BSPI_REVISION_ID 0x000 +#define BSPI_SCRATCH 0x004 +#define BSPI_MAST_N_BOOT_CTRL 0x008 +#define BSPI_BUSY_STATUS 0x00c +#define BSPI_INTR_STATUS 0x010 +#define BSPI_B0_STATUS 0x014 +#define BSPI_B0_CTRL 0x018 +#define BSPI_B1_STATUS 0x01c +#define BSPI_B1_CTRL 0x020 +#define BSPI_STRAP_OVERRIDE_CTRL 0x024 +#define BSPI_FLEX_MODE_ENABLE 0x028 +#define BSPI_BITS_PER_CYCLE 0x02c +#define BSPI_BITS_PER_PHASE 0x030 +#define BSPI_CMD_AND_MODE_BYTE 0x034 +#define BSPI_BSPI_FLASH_UPPER_ADDR_BYTE 0x038 +#define BSPI_BSPI_XOR_VALUE 0x03c +#define BSPI_BSPI_XOR_ENABLE 0x040 +#define BSPI_BSPI_PIO_MODE_ENABLE 0x044 +#define BSPI_BSPI_PIO_IODIR 0x048 +#define BSPI_BSPI_PIO_DATA 0x04c + +/* RAF register offsets */ +#define BSPI_RAF_START_ADDR 0x100 +#define BSPI_RAF_NUM_WORDS 0x104 +#define BSPI_RAF_CTRL 0x108 +#define BSPI_RAF_FULLNESS 0x10c +#define BSPI_RAF_WATERMARK 0x110 +#define BSPI_RAF_STATUS 0x114 +#define BSPI_RAF_READ_DATA 0x118 +#define BSPI_RAF_WORD_CNT 0x11c +#define BSPI_RAF_CURR_ADDR 0x120 + +/* Override mode masks */ +#define BSPI_STRAP_OVERRIDE_CTRL_OVERRIDE BIT(0) +#define BSPI_STRAP_OVERRIDE_CTRL_DATA_DUAL BIT(1) +#define BSPI_STRAP_OVERRIDE_CTRL_ADDR_4BYTE BIT(2) +#define BSPI_STRAP_OVERRIDE_CTRL_DATA_QUAD BIT(3) +#define BSPI_STRAP_OVERRIDE_CTRL_ENDAIN_MODE BIT(4) + +#define BSPI_ADDRLEN_3BYTES 3 +#define BSPI_ADDRLEN_4BYTES 4 + +#define BSPI_RAF_STATUS_FIFO_EMPTY_MASK BIT(1) + +#define BSPI_RAF_CTRL_START_MASK BIT(0) +#define BSPI_RAF_CTRL_CLEAR_MASK BIT(1) + +#define BSPI_BPP_MODE_SELECT_MASK BIT(8) +#define BSPI_BPP_ADDR_SELECT_MASK BIT(16) + +#define BSPI_READ_LENGTH 256 + +/* MSPI register offsets */ +#define MSPI_SPCR0_LSB 0x000 +#define MSPI_SPCR0_MSB 0x004 +#define MSPI_SPCR1_LSB 0x008 +#define MSPI_SPCR1_MSB 0x00c +#define MSPI_NEWQP 0x010 +#define MSPI_ENDQP 0x014 +#define MSPI_SPCR2 0x018 +#define MSPI_MSPI_STATUS 0x020 +#define MSPI_CPTQP 0x024 +#define MSPI_SPCR3 0x028 +#define MSPI_REV 0x02c +#define MSPI_TXRAM 0x040 +#define MSPI_RXRAM 0x0c0 +#define MSPI_CDRAM 0x140 +#define MSPI_WRITE_LOCK 0x180 + +#define MSPI_MASTER_BIT BIT(7) + +#define MSPI_NUM_CDRAM 16 +#define MSPI_CDRAM_CONT_BIT BIT(7) +#define MSPI_CDRAM_BITSE_BIT BIT(6) +#define MSPI_CDRAM_PCS 0xf + +#define MSPI_SPCR2_SPE BIT(6) +#define MSPI_SPCR2_CONT_AFTER_CMD BIT(7) + +#define MSPI_SPCR3_FASTBR BIT(0) +#define MSPI_SPCR3_FASTDT BIT(1) +#define MSPI_SPCR3_SYSCLKSEL_MASK GENMASK(11, 10) +#define MSPI_SPCR3_SYSCLKSEL_27 (MSPI_SPCR3_SYSCLKSEL_MASK & \ + ~(BIT(10) | BIT(11))) +#define MSPI_SPCR3_SYSCLKSEL_108 (MSPI_SPCR3_SYSCLKSEL_MASK & \ + BIT(11)) + +#define MSPI_MSPI_STATUS_SPIF BIT(0) + +#define INTR_BASE_BIT_SHIFT 0x02 +#define INTR_COUNT 0x07 + +#define NUM_CHIPSELECT 4 +#define QSPI_SPBR_MAX 255U +#define MSPI_BASE_FREQ 27000000UL + +#define OPCODE_DIOR 0xBB +#define OPCODE_QIOR 0xEB +#define OPCODE_DIOR_4B 0xBC +#define OPCODE_QIOR_4B 0xEC + +#define MAX_CMD_SIZE 6 + +#define ADDR_4MB_MASK GENMASK(22, 0) + +/* stop at end of transfer, no other reason */ +#define TRANS_STATUS_BREAK_NONE 0 +/* stop at end of spi_message */ +#define TRANS_STATUS_BREAK_EOM 1 +/* stop at end of spi_transfer if delay */ +#define TRANS_STATUS_BREAK_DELAY 2 +/* stop at end of spi_transfer if cs_change */ +#define TRANS_STATUS_BREAK_CS_CHANGE 4 +/* stop if we run out of bytes */ +#define TRANS_STATUS_BREAK_NO_BYTES 8 + +/* events that make us stop filling TX slots */ +#define TRANS_STATUS_BREAK_TX (TRANS_STATUS_BREAK_EOM | \ + TRANS_STATUS_BREAK_DELAY | \ + TRANS_STATUS_BREAK_CS_CHANGE) + +/* events that make us deassert CS */ +#define TRANS_STATUS_BREAK_DESELECT (TRANS_STATUS_BREAK_EOM | \ + TRANS_STATUS_BREAK_CS_CHANGE) + +struct bcm_qspi_parms { + u32 speed_hz; + u8 mode; + u8 bits_per_word; +}; + +struct bcm_xfer_mode { + bool flex_mode; + unsigned int width; + unsigned int addrlen; + unsigned int hp; +}; + +enum base_type { + MSPI, + BSPI, + CHIP_SELECT, + BASEMAX, +}; + +enum irq_source { + SINGLE_L2, + MUXED_L1, +}; + +struct bcm_qspi_irq { + const char *irq_name; + const irq_handler_t irq_handler; + int irq_source; + u32 mask; +}; + +struct bcm_qspi_dev_id { + const struct bcm_qspi_irq *irqp; + void *dev; +}; + + +struct qspi_trans { + struct spi_transfer *trans; + int byte; + bool mspi_last_trans; +}; + +struct bcm_qspi { + struct platform_device *pdev; + struct spi_master *master; + struct clk *clk; + u32 base_clk; + u32 max_speed_hz; + void __iomem *base[BASEMAX]; + + /* Some SoCs provide custom interrupt status register(s) */ + struct bcm_qspi_soc_intc *soc_intc; + + struct bcm_qspi_parms last_parms; + struct qspi_trans trans_pos; + int curr_cs; + int bspi_maj_rev; + int bspi_min_rev; + int bspi_enabled; + const struct spi_mem_op *bspi_rf_op; + u32 bspi_rf_op_idx; + u32 bspi_rf_op_len; + u32 bspi_rf_op_status; + struct bcm_xfer_mode xfer_mode; + u32 s3_strap_override_ctrl; + bool bspi_mode; + bool big_endian; + int num_irqs; + struct bcm_qspi_dev_id *dev_ids; + struct completion mspi_done; + struct completion bspi_done; + u8 mspi_maj_rev; + u8 mspi_min_rev; + bool mspi_spcr3_sysclk; +}; + +static inline bool has_bspi(struct bcm_qspi *qspi) +{ + return qspi->bspi_mode; +} + +/* hardware supports spcr3 and fast baud-rate */ +static inline bool bcm_qspi_has_fastbr(struct bcm_qspi *qspi) +{ + if (!has_bspi(qspi) && + ((qspi->mspi_maj_rev >= 1) && + (qspi->mspi_min_rev >= 5))) + return true; + + return false; +} + +/* hardware supports sys clk 108Mhz */ +static inline bool bcm_qspi_has_sysclk_108(struct bcm_qspi *qspi) +{ + if (!has_bspi(qspi) && (qspi->mspi_spcr3_sysclk || + ((qspi->mspi_maj_rev >= 1) && + (qspi->mspi_min_rev >= 6)))) + return true; + + return false; +} + +static inline int bcm_qspi_spbr_min(struct bcm_qspi *qspi) +{ + if (bcm_qspi_has_fastbr(qspi)) + return 1; + else + return 8; +} + +/* Read qspi controller register*/ +static inline u32 bcm_qspi_read(struct bcm_qspi *qspi, enum base_type type, + unsigned int offset) +{ + return bcm_qspi_readl(qspi->big_endian, qspi->base[type] + offset); +} + +/* Write qspi controller register*/ +static inline void bcm_qspi_write(struct bcm_qspi *qspi, enum base_type type, + unsigned int offset, unsigned int data) +{ + bcm_qspi_writel(qspi->big_endian, data, qspi->base[type] + offset); +} + +/* BSPI helpers */ +static int bcm_qspi_bspi_busy_poll(struct bcm_qspi *qspi) +{ + int i; + + /* this should normally finish within 10us */ + for (i = 0; i < 1000; i++) { + if (!(bcm_qspi_read(qspi, BSPI, BSPI_BUSY_STATUS) & 1)) + return 0; + udelay(1); + } + dev_warn(&qspi->pdev->dev, "timeout waiting for !busy_status\n"); + return -EIO; +} + +static inline bool bcm_qspi_bspi_ver_three(struct bcm_qspi *qspi) +{ + if (qspi->bspi_maj_rev < 4) + return true; + return false; +} + +static void bcm_qspi_bspi_flush_prefetch_buffers(struct bcm_qspi *qspi) +{ + bcm_qspi_bspi_busy_poll(qspi); + /* Force rising edge for the b0/b1 'flush' field */ + bcm_qspi_write(qspi, BSPI, BSPI_B0_CTRL, 1); + bcm_qspi_write(qspi, BSPI, BSPI_B1_CTRL, 1); + bcm_qspi_write(qspi, BSPI, BSPI_B0_CTRL, 0); + bcm_qspi_write(qspi, BSPI, BSPI_B1_CTRL, 0); +} + +static int bcm_qspi_bspi_lr_is_fifo_empty(struct bcm_qspi *qspi) +{ + return (bcm_qspi_read(qspi, BSPI, BSPI_RAF_STATUS) & + BSPI_RAF_STATUS_FIFO_EMPTY_MASK); +} + +static inline u32 bcm_qspi_bspi_lr_read_fifo(struct bcm_qspi *qspi) +{ + u32 data = bcm_qspi_read(qspi, BSPI, BSPI_RAF_READ_DATA); + + /* BSPI v3 LR is LE only, convert data to host endianness */ + if (bcm_qspi_bspi_ver_three(qspi)) + data = le32_to_cpu(data); + + return data; +} + +static inline void bcm_qspi_bspi_lr_start(struct bcm_qspi *qspi) +{ + bcm_qspi_bspi_busy_poll(qspi); + bcm_qspi_write(qspi, BSPI, BSPI_RAF_CTRL, + BSPI_RAF_CTRL_START_MASK); +} + +static inline void bcm_qspi_bspi_lr_clear(struct bcm_qspi *qspi) +{ + bcm_qspi_write(qspi, BSPI, BSPI_RAF_CTRL, + BSPI_RAF_CTRL_CLEAR_MASK); + bcm_qspi_bspi_flush_prefetch_buffers(qspi); +} + +static void bcm_qspi_bspi_lr_data_read(struct bcm_qspi *qspi) +{ + u32 *buf = (u32 *)qspi->bspi_rf_op->data.buf.in; + u32 data = 0; + + dev_dbg(&qspi->pdev->dev, "xfer %p rx %p rxlen %d\n", qspi->bspi_rf_op, + qspi->bspi_rf_op->data.buf.in, qspi->bspi_rf_op_len); + while (!bcm_qspi_bspi_lr_is_fifo_empty(qspi)) { + data = bcm_qspi_bspi_lr_read_fifo(qspi); + if (likely(qspi->bspi_rf_op_len >= 4) && + IS_ALIGNED((uintptr_t)buf, 4)) { + buf[qspi->bspi_rf_op_idx++] = data; + qspi->bspi_rf_op_len -= 4; + } else { + /* Read out remaining bytes, make sure*/ + u8 *cbuf = (u8 *)&buf[qspi->bspi_rf_op_idx]; + + data = cpu_to_le32(data); + while (qspi->bspi_rf_op_len) { + *cbuf++ = (u8)data; + data >>= 8; + qspi->bspi_rf_op_len--; + } + } + } +} + +static void bcm_qspi_bspi_set_xfer_params(struct bcm_qspi *qspi, u8 cmd_byte, + int bpp, int bpc, int flex_mode) +{ + bcm_qspi_write(qspi, BSPI, BSPI_FLEX_MODE_ENABLE, 0); + bcm_qspi_write(qspi, BSPI, BSPI_BITS_PER_CYCLE, bpc); + bcm_qspi_write(qspi, BSPI, BSPI_BITS_PER_PHASE, bpp); + bcm_qspi_write(qspi, BSPI, BSPI_CMD_AND_MODE_BYTE, cmd_byte); + bcm_qspi_write(qspi, BSPI, BSPI_FLEX_MODE_ENABLE, flex_mode); +} + +static int bcm_qspi_bspi_set_flex_mode(struct bcm_qspi *qspi, + const struct spi_mem_op *op, int hp) +{ + int bpc = 0, bpp = 0; + u8 command = op->cmd.opcode; + int width = op->data.buswidth ? op->data.buswidth : SPI_NBITS_SINGLE; + int addrlen = op->addr.nbytes; + int flex_mode = 1; + + dev_dbg(&qspi->pdev->dev, "set flex mode w %x addrlen %x hp %d\n", + width, addrlen, hp); + + if (addrlen == BSPI_ADDRLEN_4BYTES) + bpp = BSPI_BPP_ADDR_SELECT_MASK; + + bpp |= (op->dummy.nbytes * 8) / op->dummy.buswidth; + + switch (width) { + case SPI_NBITS_SINGLE: + if (addrlen == BSPI_ADDRLEN_3BYTES) + /* default mode, does not need flex_cmd */ + flex_mode = 0; + break; + case SPI_NBITS_DUAL: + bpc = 0x00000001; + if (hp) { + bpc |= 0x00010100; /* address and mode are 2-bit */ + bpp = BSPI_BPP_MODE_SELECT_MASK; + } + break; + case SPI_NBITS_QUAD: + bpc = 0x00000002; + if (hp) { + bpc |= 0x00020200; /* address and mode are 4-bit */ + bpp |= BSPI_BPP_MODE_SELECT_MASK; + } + break; + default: + return -EINVAL; + } + + bcm_qspi_bspi_set_xfer_params(qspi, command, bpp, bpc, flex_mode); + + return 0; +} + +static int bcm_qspi_bspi_set_override(struct bcm_qspi *qspi, + const struct spi_mem_op *op, int hp) +{ + int width = op->data.buswidth ? op->data.buswidth : SPI_NBITS_SINGLE; + int addrlen = op->addr.nbytes; + u32 data = bcm_qspi_read(qspi, BSPI, BSPI_STRAP_OVERRIDE_CTRL); + + dev_dbg(&qspi->pdev->dev, "set override mode w %x addrlen %x hp %d\n", + width, addrlen, hp); + + switch (width) { + case SPI_NBITS_SINGLE: + /* clear quad/dual mode */ + data &= ~(BSPI_STRAP_OVERRIDE_CTRL_DATA_QUAD | + BSPI_STRAP_OVERRIDE_CTRL_DATA_DUAL); + break; + case SPI_NBITS_QUAD: + /* clear dual mode and set quad mode */ + data &= ~BSPI_STRAP_OVERRIDE_CTRL_DATA_DUAL; + data |= BSPI_STRAP_OVERRIDE_CTRL_DATA_QUAD; + break; + case SPI_NBITS_DUAL: + /* clear quad mode set dual mode */ + data &= ~BSPI_STRAP_OVERRIDE_CTRL_DATA_QUAD; + data |= BSPI_STRAP_OVERRIDE_CTRL_DATA_DUAL; + break; + default: + return -EINVAL; + } + + if (addrlen == BSPI_ADDRLEN_4BYTES) + /* set 4byte mode*/ + data |= BSPI_STRAP_OVERRIDE_CTRL_ADDR_4BYTE; + else + /* clear 4 byte mode */ + data &= ~BSPI_STRAP_OVERRIDE_CTRL_ADDR_4BYTE; + + /* set the override mode */ + data |= BSPI_STRAP_OVERRIDE_CTRL_OVERRIDE; + bcm_qspi_write(qspi, BSPI, BSPI_STRAP_OVERRIDE_CTRL, data); + bcm_qspi_bspi_set_xfer_params(qspi, op->cmd.opcode, 0, 0, 0); + + return 0; +} + +static int bcm_qspi_bspi_set_mode(struct bcm_qspi *qspi, + const struct spi_mem_op *op, int hp) +{ + int error = 0; + int width = op->data.buswidth ? op->data.buswidth : SPI_NBITS_SINGLE; + int addrlen = op->addr.nbytes; + + /* default mode */ + qspi->xfer_mode.flex_mode = true; + + if (!bcm_qspi_bspi_ver_three(qspi)) { + u32 val, mask; + + val = bcm_qspi_read(qspi, BSPI, BSPI_STRAP_OVERRIDE_CTRL); + mask = BSPI_STRAP_OVERRIDE_CTRL_OVERRIDE; + if (val & mask || qspi->s3_strap_override_ctrl & mask) { + qspi->xfer_mode.flex_mode = false; + bcm_qspi_write(qspi, BSPI, BSPI_FLEX_MODE_ENABLE, 0); + error = bcm_qspi_bspi_set_override(qspi, op, hp); + } + } + + if (qspi->xfer_mode.flex_mode) + error = bcm_qspi_bspi_set_flex_mode(qspi, op, hp); + + if (error) { + dev_warn(&qspi->pdev->dev, + "INVALID COMBINATION: width=%d addrlen=%d hp=%d\n", + width, addrlen, hp); + } else if (qspi->xfer_mode.width != width || + qspi->xfer_mode.addrlen != addrlen || + qspi->xfer_mode.hp != hp) { + qspi->xfer_mode.width = width; + qspi->xfer_mode.addrlen = addrlen; + qspi->xfer_mode.hp = hp; + dev_dbg(&qspi->pdev->dev, + "cs:%d %d-lane output, %d-byte address%s\n", + qspi->curr_cs, + qspi->xfer_mode.width, + qspi->xfer_mode.addrlen, + qspi->xfer_mode.hp != -1 ? ", hp mode" : ""); + } + + return error; +} + +static void bcm_qspi_enable_bspi(struct bcm_qspi *qspi) +{ + if (!has_bspi(qspi)) + return; + + qspi->bspi_enabled = 1; + if ((bcm_qspi_read(qspi, BSPI, BSPI_MAST_N_BOOT_CTRL) & 1) == 0) + return; + + bcm_qspi_bspi_flush_prefetch_buffers(qspi); + udelay(1); + bcm_qspi_write(qspi, BSPI, BSPI_MAST_N_BOOT_CTRL, 0); + udelay(1); +} + +static void bcm_qspi_disable_bspi(struct bcm_qspi *qspi) +{ + if (!has_bspi(qspi)) + return; + + qspi->bspi_enabled = 0; + if ((bcm_qspi_read(qspi, BSPI, BSPI_MAST_N_BOOT_CTRL) & 1)) + return; + + bcm_qspi_bspi_busy_poll(qspi); + bcm_qspi_write(qspi, BSPI, BSPI_MAST_N_BOOT_CTRL, 1); + udelay(1); +} + +static void bcm_qspi_chip_select(struct bcm_qspi *qspi, int cs) +{ + u32 rd = 0; + u32 wr = 0; + + if (cs >= 0 && qspi->base[CHIP_SELECT]) { + rd = bcm_qspi_read(qspi, CHIP_SELECT, 0); + wr = (rd & ~0xff) | (1 << cs); + if (rd == wr) + return; + bcm_qspi_write(qspi, CHIP_SELECT, 0, wr); + usleep_range(10, 20); + } + + dev_dbg(&qspi->pdev->dev, "using cs:%d\n", cs); + qspi->curr_cs = cs; +} + +/* MSPI helpers */ +static void bcm_qspi_hw_set_parms(struct bcm_qspi *qspi, + const struct bcm_qspi_parms *xp) +{ + u32 spcr, spbr = 0; + + if (xp->speed_hz) + spbr = qspi->base_clk / (2 * xp->speed_hz); + + spcr = clamp_val(spbr, bcm_qspi_spbr_min(qspi), QSPI_SPBR_MAX); + bcm_qspi_write(qspi, MSPI, MSPI_SPCR0_LSB, spcr); + + if (!qspi->mspi_maj_rev) + /* legacy controller */ + spcr = MSPI_MASTER_BIT; + else + spcr = 0; + + /* for 16 bit the data should be zero */ + if (xp->bits_per_word != 16) + spcr |= xp->bits_per_word << 2; + spcr |= xp->mode & 3; + + bcm_qspi_write(qspi, MSPI, MSPI_SPCR0_MSB, spcr); + + if (bcm_qspi_has_fastbr(qspi)) { + spcr = 0; + + /* enable fastbr */ + spcr |= MSPI_SPCR3_FASTBR; + + if (bcm_qspi_has_sysclk_108(qspi)) { + /* SYSCLK_108 */ + spcr |= MSPI_SPCR3_SYSCLKSEL_108; + qspi->base_clk = MSPI_BASE_FREQ * 4; + /* Change spbr as we changed sysclk */ + bcm_qspi_write(qspi, MSPI, MSPI_SPCR0_LSB, 4); + } + + bcm_qspi_write(qspi, MSPI, MSPI_SPCR3, spcr); + } + + qspi->last_parms = *xp; +} + +static void bcm_qspi_update_parms(struct bcm_qspi *qspi, + struct spi_device *spi, + struct spi_transfer *trans) +{ + struct bcm_qspi_parms xp; + + xp.speed_hz = trans->speed_hz; + xp.bits_per_word = trans->bits_per_word; + xp.mode = spi->mode; + + bcm_qspi_hw_set_parms(qspi, &xp); +} + +static int bcm_qspi_setup(struct spi_device *spi) +{ + struct bcm_qspi_parms *xp; + + if (spi->bits_per_word > 16) + return -EINVAL; + + xp = spi_get_ctldata(spi); + if (!xp) { + xp = kzalloc(sizeof(*xp), GFP_KERNEL); + if (!xp) + return -ENOMEM; + spi_set_ctldata(spi, xp); + } + xp->speed_hz = spi->max_speed_hz; + xp->mode = spi->mode; + + if (spi->bits_per_word) + xp->bits_per_word = spi->bits_per_word; + else + xp->bits_per_word = 8; + + return 0; +} + +static bool bcm_qspi_mspi_transfer_is_last(struct bcm_qspi *qspi, + struct qspi_trans *qt) +{ + if (qt->mspi_last_trans && + spi_transfer_is_last(qspi->master, qt->trans)) + return true; + else + return false; +} + +static int update_qspi_trans_byte_count(struct bcm_qspi *qspi, + struct qspi_trans *qt, int flags) +{ + int ret = TRANS_STATUS_BREAK_NONE; + + /* count the last transferred bytes */ + if (qt->trans->bits_per_word <= 8) + qt->byte++; + else + qt->byte += 2; + + if (qt->byte >= qt->trans->len) { + /* we're at the end of the spi_transfer */ + /* in TX mode, need to pause for a delay or CS change */ + if (qt->trans->delay_usecs && + (flags & TRANS_STATUS_BREAK_DELAY)) + ret |= TRANS_STATUS_BREAK_DELAY; + if (qt->trans->cs_change && + (flags & TRANS_STATUS_BREAK_CS_CHANGE)) + ret |= TRANS_STATUS_BREAK_CS_CHANGE; + + if (bcm_qspi_mspi_transfer_is_last(qspi, qt)) + ret |= TRANS_STATUS_BREAK_EOM; + else + ret |= TRANS_STATUS_BREAK_NO_BYTES; + + qt->trans = NULL; + } + + dev_dbg(&qspi->pdev->dev, "trans %p len %d byte %d ret %x\n", + qt->trans, qt->trans ? qt->trans->len : 0, qt->byte, ret); + return ret; +} + +static inline u8 read_rxram_slot_u8(struct bcm_qspi *qspi, int slot) +{ + u32 slot_offset = MSPI_RXRAM + (slot << 3) + 0x4; + + /* mask out reserved bits */ + return bcm_qspi_read(qspi, MSPI, slot_offset) & 0xff; +} + +static inline u16 read_rxram_slot_u16(struct bcm_qspi *qspi, int slot) +{ + u32 reg_offset = MSPI_RXRAM; + u32 lsb_offset = reg_offset + (slot << 3) + 0x4; + u32 msb_offset = reg_offset + (slot << 3); + + return (bcm_qspi_read(qspi, MSPI, lsb_offset) & 0xff) | + ((bcm_qspi_read(qspi, MSPI, msb_offset) & 0xff) << 8); +} + +static void read_from_hw(struct bcm_qspi *qspi, int slots) +{ + struct qspi_trans tp; + int slot; + + bcm_qspi_disable_bspi(qspi); + + if (slots > MSPI_NUM_CDRAM) { + /* should never happen */ + dev_err(&qspi->pdev->dev, "%s: too many slots!\n", __func__); + return; + } + + tp = qspi->trans_pos; + + for (slot = 0; slot < slots; slot++) { + if (tp.trans->bits_per_word <= 8) { + u8 *buf = tp.trans->rx_buf; + + if (buf) + buf[tp.byte] = read_rxram_slot_u8(qspi, slot); + dev_dbg(&qspi->pdev->dev, "RD %02x\n", + buf ? buf[tp.byte] : 0x0); + } else { + u16 *buf = tp.trans->rx_buf; + + if (buf) + buf[tp.byte / 2] = read_rxram_slot_u16(qspi, + slot); + dev_dbg(&qspi->pdev->dev, "RD %04x\n", + buf ? buf[tp.byte / 2] : 0x0); + } + + update_qspi_trans_byte_count(qspi, &tp, + TRANS_STATUS_BREAK_NONE); + } + + qspi->trans_pos = tp; +} + +static inline void write_txram_slot_u8(struct bcm_qspi *qspi, int slot, + u8 val) +{ + u32 reg_offset = MSPI_TXRAM + (slot << 3); + + /* mask out reserved bits */ + bcm_qspi_write(qspi, MSPI, reg_offset, val); +} + +static inline void write_txram_slot_u16(struct bcm_qspi *qspi, int slot, + u16 val) +{ + u32 reg_offset = MSPI_TXRAM; + u32 msb_offset = reg_offset + (slot << 3); + u32 lsb_offset = reg_offset + (slot << 3) + 0x4; + + bcm_qspi_write(qspi, MSPI, msb_offset, (val >> 8)); + bcm_qspi_write(qspi, MSPI, lsb_offset, (val & 0xff)); +} + +static inline u32 read_cdram_slot(struct bcm_qspi *qspi, int slot) +{ + return bcm_qspi_read(qspi, MSPI, MSPI_CDRAM + (slot << 2)); +} + +static inline void write_cdram_slot(struct bcm_qspi *qspi, int slot, u32 val) +{ + bcm_qspi_write(qspi, MSPI, (MSPI_CDRAM + (slot << 2)), val); +} + +/* Return number of slots written */ +static int write_to_hw(struct bcm_qspi *qspi, struct spi_device *spi) +{ + struct qspi_trans tp; + int slot = 0, tstatus = 0; + u32 mspi_cdram = 0; + + bcm_qspi_disable_bspi(qspi); + tp = qspi->trans_pos; + bcm_qspi_update_parms(qspi, spi, tp.trans); + + /* Run until end of transfer or reached the max data */ + while (!tstatus && slot < MSPI_NUM_CDRAM) { + if (tp.trans->bits_per_word <= 8) { + const u8 *buf = tp.trans->tx_buf; + u8 val = buf ? buf[tp.byte] : 0x00; + + write_txram_slot_u8(qspi, slot, val); + dev_dbg(&qspi->pdev->dev, "WR %02x\n", val); + } else { + const u16 *buf = tp.trans->tx_buf; + u16 val = buf ? buf[tp.byte / 2] : 0x0000; + + write_txram_slot_u16(qspi, slot, val); + dev_dbg(&qspi->pdev->dev, "WR %04x\n", val); + } + mspi_cdram = MSPI_CDRAM_CONT_BIT; + + if (has_bspi(qspi)) + mspi_cdram &= ~1; + else + mspi_cdram |= (~(1 << spi->chip_select) & + MSPI_CDRAM_PCS); + + mspi_cdram |= ((tp.trans->bits_per_word <= 8) ? 0 : + MSPI_CDRAM_BITSE_BIT); + + write_cdram_slot(qspi, slot, mspi_cdram); + + tstatus = update_qspi_trans_byte_count(qspi, &tp, + TRANS_STATUS_BREAK_TX); + slot++; + } + + if (!slot) { + dev_err(&qspi->pdev->dev, "%s: no data to send?", __func__); + goto done; + } + + dev_dbg(&qspi->pdev->dev, "submitting %d slots\n", slot); + bcm_qspi_write(qspi, MSPI, MSPI_NEWQP, 0); + bcm_qspi_write(qspi, MSPI, MSPI_ENDQP, slot - 1); + + /* + * case 1) EOM =1, cs_change =0: SSb inactive + * case 2) EOM =1, cs_change =1: SSb stay active + * case 3) EOM =0, cs_change =0: SSb stay active + * case 4) EOM =0, cs_change =1: SSb inactive + */ + if (((tstatus & TRANS_STATUS_BREAK_DESELECT) + == TRANS_STATUS_BREAK_CS_CHANGE) || + ((tstatus & TRANS_STATUS_BREAK_DESELECT) + == TRANS_STATUS_BREAK_EOM)) { + mspi_cdram = read_cdram_slot(qspi, slot - 1) & + ~MSPI_CDRAM_CONT_BIT; + write_cdram_slot(qspi, slot - 1, mspi_cdram); + } + + if (has_bspi(qspi)) + bcm_qspi_write(qspi, MSPI, MSPI_WRITE_LOCK, 1); + + /* Must flush previous writes before starting MSPI operation */ + mb(); + /* Set cont | spe | spifie */ + bcm_qspi_write(qspi, MSPI, MSPI_SPCR2, 0xe0); + +done: + return slot; +} + +static int bcm_qspi_bspi_exec_mem_op(struct spi_device *spi, + const struct spi_mem_op *op) +{ + struct bcm_qspi *qspi = spi_master_get_devdata(spi->master); + u32 addr = 0, len, rdlen, len_words, from = 0; + int ret = 0; + unsigned long timeo = msecs_to_jiffies(100); + struct bcm_qspi_soc_intc *soc_intc = qspi->soc_intc; + + if (bcm_qspi_bspi_ver_three(qspi)) + if (op->addr.nbytes == BSPI_ADDRLEN_4BYTES) + return -EIO; + + from = op->addr.val; + if (!spi->cs_gpiod) + bcm_qspi_chip_select(qspi, spi->chip_select); + bcm_qspi_write(qspi, MSPI, MSPI_WRITE_LOCK, 0); + + /* + * when using flex mode we need to send + * the upper address byte to bspi + */ + if (bcm_qspi_bspi_ver_three(qspi) == false) { + addr = from & 0xff000000; + bcm_qspi_write(qspi, BSPI, + BSPI_BSPI_FLASH_UPPER_ADDR_BYTE, addr); + } + + if (!qspi->xfer_mode.flex_mode) + addr = from; + else + addr = from & 0x00ffffff; + + if (bcm_qspi_bspi_ver_three(qspi) == true) + addr = (addr + 0xc00000) & 0xffffff; + + /* + * read into the entire buffer by breaking the reads + * into RAF buffer read lengths + */ + len = op->data.nbytes; + qspi->bspi_rf_op_idx = 0; + + do { + if (len > BSPI_READ_LENGTH) + rdlen = BSPI_READ_LENGTH; + else + rdlen = len; + + reinit_completion(&qspi->bspi_done); + bcm_qspi_enable_bspi(qspi); + len_words = (rdlen + 3) >> 2; + qspi->bspi_rf_op = op; + qspi->bspi_rf_op_status = 0; + qspi->bspi_rf_op_len = rdlen; + dev_dbg(&qspi->pdev->dev, + "bspi xfr addr 0x%x len 0x%x", addr, rdlen); + bcm_qspi_write(qspi, BSPI, BSPI_RAF_START_ADDR, addr); + bcm_qspi_write(qspi, BSPI, BSPI_RAF_NUM_WORDS, len_words); + bcm_qspi_write(qspi, BSPI, BSPI_RAF_WATERMARK, 0); + if (qspi->soc_intc) { + /* + * clear soc MSPI and BSPI interrupts and enable + * BSPI interrupts. + */ + soc_intc->bcm_qspi_int_ack(soc_intc, MSPI_BSPI_DONE); + soc_intc->bcm_qspi_int_set(soc_intc, BSPI_DONE, true); + } + + /* Must flush previous writes before starting BSPI operation */ + mb(); + bcm_qspi_bspi_lr_start(qspi); + if (!wait_for_completion_timeout(&qspi->bspi_done, timeo)) { + dev_err(&qspi->pdev->dev, "timeout waiting for BSPI\n"); + ret = -ETIMEDOUT; + break; + } + + /* set msg return length */ + addr += rdlen; + len -= rdlen; + } while (len); + + return ret; +} + +static int bcm_qspi_transfer_one(struct spi_master *master, + struct spi_device *spi, + struct spi_transfer *trans) +{ + struct bcm_qspi *qspi = spi_master_get_devdata(master); + int slots; + unsigned long timeo = msecs_to_jiffies(100); + + if (!spi->cs_gpiod) + bcm_qspi_chip_select(qspi, spi->chip_select); + qspi->trans_pos.trans = trans; + qspi->trans_pos.byte = 0; + + while (qspi->trans_pos.byte < trans->len) { + reinit_completion(&qspi->mspi_done); + + slots = write_to_hw(qspi, spi); + if (!wait_for_completion_timeout(&qspi->mspi_done, timeo)) { + dev_err(&qspi->pdev->dev, "timeout waiting for MSPI\n"); + return -ETIMEDOUT; + } + + read_from_hw(qspi, slots); + } + bcm_qspi_enable_bspi(qspi); + + return 0; +} + +static int bcm_qspi_mspi_exec_mem_op(struct spi_device *spi, + const struct spi_mem_op *op) +{ + struct spi_master *master = spi->master; + struct bcm_qspi *qspi = spi_master_get_devdata(master); + struct spi_transfer t[2]; + u8 cmd[6] = { }; + int ret, i; + + memset(cmd, 0, sizeof(cmd)); + memset(t, 0, sizeof(t)); + + /* tx */ + /* opcode is in cmd[0] */ + cmd[0] = op->cmd.opcode; + for (i = 0; i < op->addr.nbytes; i++) + cmd[1 + i] = op->addr.val >> (8 * (op->addr.nbytes - i - 1)); + + t[0].tx_buf = cmd; + t[0].len = op->addr.nbytes + op->dummy.nbytes + 1; + t[0].bits_per_word = spi->bits_per_word; + t[0].tx_nbits = op->cmd.buswidth; + /* lets mspi know that this is not last transfer */ + qspi->trans_pos.mspi_last_trans = false; + ret = bcm_qspi_transfer_one(master, spi, &t[0]); + + /* rx */ + qspi->trans_pos.mspi_last_trans = true; + if (!ret) { + /* rx */ + t[1].rx_buf = op->data.buf.in; + t[1].len = op->data.nbytes; + t[1].rx_nbits = op->data.buswidth; + t[1].bits_per_word = spi->bits_per_word; + ret = bcm_qspi_transfer_one(master, spi, &t[1]); + } + + return ret; +} + +static int bcm_qspi_exec_mem_op(struct spi_mem *mem, + const struct spi_mem_op *op) +{ + struct spi_device *spi = mem->spi; + struct bcm_qspi *qspi = spi_master_get_devdata(spi->master); + int ret = 0; + bool mspi_read = false; + u32 addr = 0, len; + u_char *buf; + + if (!op->data.nbytes || !op->addr.nbytes || op->addr.nbytes > 4 || + op->data.dir != SPI_MEM_DATA_IN) + return -ENOTSUPP; + + buf = op->data.buf.in; + addr = op->addr.val; + len = op->data.nbytes; + + if (has_bspi(qspi) && bcm_qspi_bspi_ver_three(qspi) == true) { + /* + * The address coming into this function is a raw flash offset. + * But for BSPI <= V3, we need to convert it to a remapped BSPI + * address. If it crosses a 4MB boundary, just revert back to + * using MSPI. + */ + addr = (addr + 0xc00000) & 0xffffff; + + if ((~ADDR_4MB_MASK & addr) ^ + (~ADDR_4MB_MASK & (addr + len - 1))) + mspi_read = true; + } + + /* non-aligned and very short transfers are handled by MSPI */ + if (!IS_ALIGNED((uintptr_t)addr, 4) || !IS_ALIGNED((uintptr_t)buf, 4) || + len < 4) + mspi_read = true; + + if (!has_bspi(qspi) || mspi_read) + return bcm_qspi_mspi_exec_mem_op(spi, op); + + ret = bcm_qspi_bspi_set_mode(qspi, op, 0); + + if (!ret) + ret = bcm_qspi_bspi_exec_mem_op(spi, op); + + return ret; +} + +static void bcm_qspi_cleanup(struct spi_device *spi) +{ + struct bcm_qspi_parms *xp = spi_get_ctldata(spi); + + kfree(xp); +} + +static irqreturn_t bcm_qspi_mspi_l2_isr(int irq, void *dev_id) +{ + struct bcm_qspi_dev_id *qspi_dev_id = dev_id; + struct bcm_qspi *qspi = qspi_dev_id->dev; + u32 status = bcm_qspi_read(qspi, MSPI, MSPI_MSPI_STATUS); + + if (status & MSPI_MSPI_STATUS_SPIF) { + struct bcm_qspi_soc_intc *soc_intc = qspi->soc_intc; + /* clear interrupt */ + status &= ~MSPI_MSPI_STATUS_SPIF; + bcm_qspi_write(qspi, MSPI, MSPI_MSPI_STATUS, status); + if (qspi->soc_intc) + soc_intc->bcm_qspi_int_ack(soc_intc, MSPI_DONE); + complete(&qspi->mspi_done); + return IRQ_HANDLED; + } + + return IRQ_NONE; +} + +static irqreturn_t bcm_qspi_bspi_lr_l2_isr(int irq, void *dev_id) +{ + struct bcm_qspi_dev_id *qspi_dev_id = dev_id; + struct bcm_qspi *qspi = qspi_dev_id->dev; + struct bcm_qspi_soc_intc *soc_intc = qspi->soc_intc; + u32 status = qspi_dev_id->irqp->mask; + + if (qspi->bspi_enabled && qspi->bspi_rf_op) { + bcm_qspi_bspi_lr_data_read(qspi); + if (qspi->bspi_rf_op_len == 0) { + qspi->bspi_rf_op = NULL; + if (qspi->soc_intc) { + /* disable soc BSPI interrupt */ + soc_intc->bcm_qspi_int_set(soc_intc, BSPI_DONE, + false); + /* indicate done */ + status = INTR_BSPI_LR_SESSION_DONE_MASK; + } + + if (qspi->bspi_rf_op_status) + bcm_qspi_bspi_lr_clear(qspi); + else + bcm_qspi_bspi_flush_prefetch_buffers(qspi); + } + + if (qspi->soc_intc) + /* clear soc BSPI interrupt */ + soc_intc->bcm_qspi_int_ack(soc_intc, BSPI_DONE); + } + + status &= INTR_BSPI_LR_SESSION_DONE_MASK; + if (qspi->bspi_enabled && status && qspi->bspi_rf_op_len == 0) + complete(&qspi->bspi_done); + + return IRQ_HANDLED; +} + +static irqreturn_t bcm_qspi_bspi_lr_err_l2_isr(int irq, void *dev_id) +{ + struct bcm_qspi_dev_id *qspi_dev_id = dev_id; + struct bcm_qspi *qspi = qspi_dev_id->dev; + struct bcm_qspi_soc_intc *soc_intc = qspi->soc_intc; + + dev_err(&qspi->pdev->dev, "BSPI INT error\n"); + qspi->bspi_rf_op_status = -EIO; + if (qspi->soc_intc) + /* clear soc interrupt */ + soc_intc->bcm_qspi_int_ack(soc_intc, BSPI_ERR); + + complete(&qspi->bspi_done); + return IRQ_HANDLED; +} + +static irqreturn_t bcm_qspi_l1_isr(int irq, void *dev_id) +{ + struct bcm_qspi_dev_id *qspi_dev_id = dev_id; + struct bcm_qspi *qspi = qspi_dev_id->dev; + struct bcm_qspi_soc_intc *soc_intc = qspi->soc_intc; + irqreturn_t ret = IRQ_NONE; + + if (soc_intc) { + u32 status = soc_intc->bcm_qspi_get_int_status(soc_intc); + + if (status & MSPI_DONE) + ret = bcm_qspi_mspi_l2_isr(irq, dev_id); + else if (status & BSPI_DONE) + ret = bcm_qspi_bspi_lr_l2_isr(irq, dev_id); + else if (status & BSPI_ERR) + ret = bcm_qspi_bspi_lr_err_l2_isr(irq, dev_id); + } + + return ret; +} + +static const struct bcm_qspi_irq qspi_irq_tab[] = { + { + .irq_name = "spi_lr_fullness_reached", + .irq_handler = bcm_qspi_bspi_lr_l2_isr, + .mask = INTR_BSPI_LR_FULLNESS_REACHED_MASK, + }, + { + .irq_name = "spi_lr_session_aborted", + .irq_handler = bcm_qspi_bspi_lr_err_l2_isr, + .mask = INTR_BSPI_LR_SESSION_ABORTED_MASK, + }, + { + .irq_name = "spi_lr_impatient", + .irq_handler = bcm_qspi_bspi_lr_err_l2_isr, + .mask = INTR_BSPI_LR_IMPATIENT_MASK, + }, + { + .irq_name = "spi_lr_session_done", + .irq_handler = bcm_qspi_bspi_lr_l2_isr, + .mask = INTR_BSPI_LR_SESSION_DONE_MASK, + }, +#ifdef QSPI_INT_DEBUG + /* this interrupt is for debug purposes only, dont request irq */ + { + .irq_name = "spi_lr_overread", + .irq_handler = bcm_qspi_bspi_lr_err_l2_isr, + .mask = INTR_BSPI_LR_OVERREAD_MASK, + }, +#endif + { + .irq_name = "mspi_done", + .irq_handler = bcm_qspi_mspi_l2_isr, + .mask = INTR_MSPI_DONE_MASK, + }, + { + .irq_name = "mspi_halted", + .irq_handler = bcm_qspi_mspi_l2_isr, + .mask = INTR_MSPI_HALTED_MASK, + }, + { + /* single muxed L1 interrupt source */ + .irq_name = "spi_l1_intr", + .irq_handler = bcm_qspi_l1_isr, + .irq_source = MUXED_L1, + .mask = QSPI_INTERRUPTS_ALL, + }, +}; + +static void bcm_qspi_bspi_init(struct bcm_qspi *qspi) +{ + u32 val = 0; + + val = bcm_qspi_read(qspi, BSPI, BSPI_REVISION_ID); + qspi->bspi_maj_rev = (val >> 8) & 0xff; + qspi->bspi_min_rev = val & 0xff; + if (!(bcm_qspi_bspi_ver_three(qspi))) { + /* Force mapping of BSPI address -> flash offset */ + bcm_qspi_write(qspi, BSPI, BSPI_BSPI_XOR_VALUE, 0); + bcm_qspi_write(qspi, BSPI, BSPI_BSPI_XOR_ENABLE, 1); + } + qspi->bspi_enabled = 1; + bcm_qspi_disable_bspi(qspi); + bcm_qspi_write(qspi, BSPI, BSPI_B0_CTRL, 0); + bcm_qspi_write(qspi, BSPI, BSPI_B1_CTRL, 0); +} + +static void bcm_qspi_hw_init(struct bcm_qspi *qspi) +{ + struct bcm_qspi_parms parms; + + bcm_qspi_write(qspi, MSPI, MSPI_SPCR1_LSB, 0); + bcm_qspi_write(qspi, MSPI, MSPI_SPCR1_MSB, 0); + bcm_qspi_write(qspi, MSPI, MSPI_NEWQP, 0); + bcm_qspi_write(qspi, MSPI, MSPI_ENDQP, 0); + bcm_qspi_write(qspi, MSPI, MSPI_SPCR2, 0x20); + + parms.mode = SPI_MODE_3; + parms.bits_per_word = 8; + parms.speed_hz = qspi->max_speed_hz; + bcm_qspi_hw_set_parms(qspi, &parms); + + if (has_bspi(qspi)) + bcm_qspi_bspi_init(qspi); +} + +static void bcm_qspi_hw_uninit(struct bcm_qspi *qspi) +{ + u32 status = bcm_qspi_read(qspi, MSPI, MSPI_MSPI_STATUS); + + bcm_qspi_write(qspi, MSPI, MSPI_SPCR2, 0); + if (has_bspi(qspi)) + bcm_qspi_write(qspi, MSPI, MSPI_WRITE_LOCK, 0); + + /* clear interrupt */ + bcm_qspi_write(qspi, MSPI, MSPI_MSPI_STATUS, status & ~1); +} + +static const struct spi_controller_mem_ops bcm_qspi_mem_ops = { + .exec_op = bcm_qspi_exec_mem_op, +}; + +struct bcm_qspi_data { + bool has_mspi_rev; + bool has_spcr3_sysclk; +}; + +static const struct bcm_qspi_data bcm_qspi_no_rev_data = { + .has_mspi_rev = false, + .has_spcr3_sysclk = false, +}; + +static const struct bcm_qspi_data bcm_qspi_rev_data = { + .has_mspi_rev = true, + .has_spcr3_sysclk = false, +}; + +static const struct bcm_qspi_data bcm_qspi_spcr3_data = { + .has_mspi_rev = true, + .has_spcr3_sysclk = true, +}; + +static const struct of_device_id bcm_qspi_of_match[] = { + { + .compatible = "brcm,spi-bcm7445-qspi", + .data = &bcm_qspi_rev_data, + + }, + { + .compatible = "brcm,spi-bcm-qspi", + .data = &bcm_qspi_no_rev_data, + }, + { + .compatible = "brcm,spi-bcm7216-qspi", + .data = &bcm_qspi_spcr3_data, + }, + { + .compatible = "brcm,spi-bcm7278-qspi", + .data = &bcm_qspi_spcr3_data, + }, + {}, +}; +MODULE_DEVICE_TABLE(of, bcm_qspi_of_match); + +int bcm_qspi_probe(struct platform_device *pdev, + struct bcm_qspi_soc_intc *soc_intc) +{ + const struct of_device_id *of_id = NULL; + const struct bcm_qspi_data *data; + struct device *dev = &pdev->dev; + struct bcm_qspi *qspi; + struct spi_master *master; + struct resource *res; + int irq, ret = 0, num_ints = 0; + u32 val; + u32 rev = 0; + const char *name = NULL; + int num_irqs = ARRAY_SIZE(qspi_irq_tab); + + /* We only support device-tree instantiation */ + if (!dev->of_node) + return -ENODEV; + + of_id = of_match_node(bcm_qspi_of_match, dev->of_node); + if (!of_id) + return -ENODEV; + + data = of_id->data; + + master = devm_spi_alloc_master(dev, sizeof(struct bcm_qspi)); + if (!master) { + dev_err(dev, "error allocating spi_master\n"); + return -ENOMEM; + } + + qspi = spi_master_get_devdata(master); + + qspi->clk = devm_clk_get_optional(&pdev->dev, NULL); + if (IS_ERR(qspi->clk)) + return PTR_ERR(qspi->clk); + + qspi->pdev = pdev; + qspi->trans_pos.trans = NULL; + qspi->trans_pos.byte = 0; + qspi->trans_pos.mspi_last_trans = true; + qspi->master = master; + + master->bus_num = -1; + master->mode_bits = SPI_CPHA | SPI_CPOL | SPI_RX_DUAL | SPI_RX_QUAD; + master->setup = bcm_qspi_setup; + master->transfer_one = bcm_qspi_transfer_one; + master->mem_ops = &bcm_qspi_mem_ops; + master->cleanup = bcm_qspi_cleanup; + master->dev.of_node = dev->of_node; + master->num_chipselect = NUM_CHIPSELECT; + master->use_gpio_descriptors = true; + + qspi->big_endian = of_device_is_big_endian(dev->of_node); + + if (!of_property_read_u32(dev->of_node, "num-cs", &val)) + master->num_chipselect = val; + + res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "hif_mspi"); + if (!res) + res = platform_get_resource_byname(pdev, IORESOURCE_MEM, + "mspi"); + + qspi->base[MSPI] = devm_ioremap_resource(dev, res); + if (IS_ERR(qspi->base[MSPI])) + return PTR_ERR(qspi->base[MSPI]); + + res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "bspi"); + if (res) { + qspi->base[BSPI] = devm_ioremap_resource(dev, res); + if (IS_ERR(qspi->base[BSPI])) + return PTR_ERR(qspi->base[BSPI]); + qspi->bspi_mode = true; + } else { + qspi->bspi_mode = false; + } + + dev_info(dev, "using %smspi mode\n", qspi->bspi_mode ? "bspi-" : ""); + + res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "cs_reg"); + if (res) { + qspi->base[CHIP_SELECT] = devm_ioremap_resource(dev, res); + if (IS_ERR(qspi->base[CHIP_SELECT])) + return PTR_ERR(qspi->base[CHIP_SELECT]); + } + + qspi->dev_ids = kcalloc(num_irqs, sizeof(struct bcm_qspi_dev_id), + GFP_KERNEL); + if (!qspi->dev_ids) + return -ENOMEM; + + /* + * Some SoCs integrate spi controller (e.g., its interrupt bits) + * in specific ways + */ + if (soc_intc) { + qspi->soc_intc = soc_intc; + soc_intc->bcm_qspi_int_set(soc_intc, MSPI_DONE, true); + } else { + qspi->soc_intc = NULL; + } + + if (qspi->clk) { + ret = clk_prepare_enable(qspi->clk); + if (ret) { + dev_err(dev, "failed to prepare clock\n"); + goto qspi_probe_err; + } + qspi->base_clk = clk_get_rate(qspi->clk); + } else { + qspi->base_clk = MSPI_BASE_FREQ; + } + + if (data->has_mspi_rev) { + rev = bcm_qspi_read(qspi, MSPI, MSPI_REV); + /* some older revs do not have a MSPI_REV register */ + if ((rev & 0xff) == 0xff) + rev = 0; + } + + qspi->mspi_maj_rev = (rev >> 4) & 0xf; + qspi->mspi_min_rev = rev & 0xf; + qspi->mspi_spcr3_sysclk = data->has_spcr3_sysclk; + + qspi->max_speed_hz = qspi->base_clk / (bcm_qspi_spbr_min(qspi) * 2); + + /* + * On SW resets it is possible to have the mask still enabled + * Need to disable the mask and clear the status while we init + */ + bcm_qspi_hw_uninit(qspi); + + for (val = 0; val < num_irqs; val++) { + irq = -1; + name = qspi_irq_tab[val].irq_name; + if (qspi_irq_tab[val].irq_source == SINGLE_L2) { + /* get the l2 interrupts */ + irq = platform_get_irq_byname_optional(pdev, name); + } else if (!num_ints && soc_intc) { + /* all mspi, bspi intrs muxed to one L1 intr */ + irq = platform_get_irq(pdev, 0); + } + + if (irq >= 0) { + ret = devm_request_irq(&pdev->dev, irq, + qspi_irq_tab[val].irq_handler, 0, + name, + &qspi->dev_ids[val]); + if (ret < 0) { + dev_err(&pdev->dev, "IRQ %s not found\n", name); + goto qspi_unprepare_err; + } + + qspi->dev_ids[val].dev = qspi; + qspi->dev_ids[val].irqp = &qspi_irq_tab[val]; + num_ints++; + dev_dbg(&pdev->dev, "registered IRQ %s %d\n", + qspi_irq_tab[val].irq_name, + irq); + } + } + + if (!num_ints) { + dev_err(&pdev->dev, "no IRQs registered, cannot init driver\n"); + ret = -EINVAL; + goto qspi_unprepare_err; + } + + bcm_qspi_hw_init(qspi); + init_completion(&qspi->mspi_done); + init_completion(&qspi->bspi_done); + qspi->curr_cs = -1; + + platform_set_drvdata(pdev, qspi); + + qspi->xfer_mode.width = -1; + qspi->xfer_mode.addrlen = -1; + qspi->xfer_mode.hp = -1; + + ret = spi_register_master(master); + if (ret < 0) { + dev_err(dev, "can't register master\n"); + goto qspi_reg_err; + } + + return 0; + +qspi_reg_err: + bcm_qspi_hw_uninit(qspi); +qspi_unprepare_err: + clk_disable_unprepare(qspi->clk); +qspi_probe_err: + kfree(qspi->dev_ids); + return ret; +} +/* probe function to be called by SoC specific platform driver probe */ +EXPORT_SYMBOL_GPL(bcm_qspi_probe); + +int bcm_qspi_remove(struct platform_device *pdev) +{ + struct bcm_qspi *qspi = platform_get_drvdata(pdev); + + spi_unregister_master(qspi->master); + bcm_qspi_hw_uninit(qspi); + clk_disable_unprepare(qspi->clk); + kfree(qspi->dev_ids); + + return 0; +} +/* function to be called by SoC specific platform driver remove() */ +EXPORT_SYMBOL_GPL(bcm_qspi_remove); + +static int __maybe_unused bcm_qspi_suspend(struct device *dev) +{ + struct bcm_qspi *qspi = dev_get_drvdata(dev); + + /* store the override strap value */ + if (!bcm_qspi_bspi_ver_three(qspi)) + qspi->s3_strap_override_ctrl = + bcm_qspi_read(qspi, BSPI, BSPI_STRAP_OVERRIDE_CTRL); + + spi_master_suspend(qspi->master); + clk_disable_unprepare(qspi->clk); + bcm_qspi_hw_uninit(qspi); + + return 0; +}; + +static int __maybe_unused bcm_qspi_resume(struct device *dev) +{ + struct bcm_qspi *qspi = dev_get_drvdata(dev); + int ret = 0; + + bcm_qspi_hw_init(qspi); + bcm_qspi_chip_select(qspi, qspi->curr_cs); + if (qspi->soc_intc) + /* enable MSPI interrupt */ + qspi->soc_intc->bcm_qspi_int_set(qspi->soc_intc, MSPI_DONE, + true); + + ret = clk_prepare_enable(qspi->clk); + if (!ret) + spi_master_resume(qspi->master); + + return ret; +} + +SIMPLE_DEV_PM_OPS(bcm_qspi_pm_ops, bcm_qspi_suspend, bcm_qspi_resume); + +/* pm_ops to be called by SoC specific platform driver */ +EXPORT_SYMBOL_GPL(bcm_qspi_pm_ops); + +MODULE_AUTHOR("Kamal Dasu"); +MODULE_DESCRIPTION("Broadcom QSPI driver"); +MODULE_LICENSE("GPL v2"); +MODULE_ALIAS("platform:" DRIVER_NAME); diff --git a/drivers/spi/spi-bcm-qspi.h b/drivers/spi/spi-bcm-qspi.h new file mode 100644 index 000000000..01aec6460 --- /dev/null +++ b/drivers/spi/spi-bcm-qspi.h @@ -0,0 +1,104 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* + * Copyright 2016 Broadcom + */ + +#ifndef __SPI_BCM_QSPI_H__ +#define __SPI_BCM_QSPI_H__ + +#include <linux/types.h> +#include <linux/io.h> + +/* BSPI interrupt masks */ +#define INTR_BSPI_LR_OVERREAD_MASK BIT(4) +#define INTR_BSPI_LR_SESSION_DONE_MASK BIT(3) +#define INTR_BSPI_LR_IMPATIENT_MASK BIT(2) +#define INTR_BSPI_LR_SESSION_ABORTED_MASK BIT(1) +#define INTR_BSPI_LR_FULLNESS_REACHED_MASK BIT(0) + +#define BSPI_LR_INTERRUPTS_DATA \ + (INTR_BSPI_LR_SESSION_DONE_MASK | \ + INTR_BSPI_LR_FULLNESS_REACHED_MASK) + +#define BSPI_LR_INTERRUPTS_ERROR \ + (INTR_BSPI_LR_OVERREAD_MASK | \ + INTR_BSPI_LR_IMPATIENT_MASK | \ + INTR_BSPI_LR_SESSION_ABORTED_MASK) + +#define BSPI_LR_INTERRUPTS_ALL \ + (BSPI_LR_INTERRUPTS_ERROR | \ + BSPI_LR_INTERRUPTS_DATA) + +/* MSPI Interrupt masks */ +#define INTR_MSPI_HALTED_MASK BIT(6) +#define INTR_MSPI_DONE_MASK BIT(5) + +#define MSPI_INTERRUPTS_ALL \ + (INTR_MSPI_DONE_MASK | \ + INTR_MSPI_HALTED_MASK) + +#define QSPI_INTERRUPTS_ALL \ + (MSPI_INTERRUPTS_ALL | \ + BSPI_LR_INTERRUPTS_ALL) + +struct platform_device; +struct dev_pm_ops; + +enum { + MSPI_DONE = 0x1, + BSPI_DONE = 0x2, + BSPI_ERR = 0x4, + MSPI_BSPI_DONE = 0x7 +}; + +struct bcm_qspi_soc_intc { + void (*bcm_qspi_int_ack)(struct bcm_qspi_soc_intc *soc_intc, int type); + void (*bcm_qspi_int_set)(struct bcm_qspi_soc_intc *soc_intc, int type, + bool en); + u32 (*bcm_qspi_get_int_status)(struct bcm_qspi_soc_intc *soc_intc); +}; + +/* Read controller register*/ +static inline u32 bcm_qspi_readl(bool be, void __iomem *addr) +{ + if (be) + return ioread32be(addr); + else + return readl_relaxed(addr); +} + +/* Write controller register*/ +static inline void bcm_qspi_writel(bool be, + unsigned int data, void __iomem *addr) +{ + if (be) + iowrite32be(data, addr); + else + writel_relaxed(data, addr); +} + +static inline u32 get_qspi_mask(int type) +{ + switch (type) { + case MSPI_DONE: + return INTR_MSPI_DONE_MASK; + case BSPI_DONE: + return BSPI_LR_INTERRUPTS_ALL; + case MSPI_BSPI_DONE: + return QSPI_INTERRUPTS_ALL; + case BSPI_ERR: + return BSPI_LR_INTERRUPTS_ERROR; + } + + return 0; +} + +/* The common driver functions to be called by the SoC platform driver */ +int bcm_qspi_probe(struct platform_device *pdev, + struct bcm_qspi_soc_intc *soc_intc); +int bcm_qspi_remove(struct platform_device *pdev); + +/* pm_ops used by the SoC platform driver called on PM suspend/resume */ +extern const struct dev_pm_ops bcm_qspi_pm_ops; + +#endif /* __SPI_BCM_QSPI_H__ */ diff --git a/drivers/spi/spi-bcm2835.c b/drivers/spi/spi-bcm2835.c new file mode 100644 index 000000000..bb9d8386b --- /dev/null +++ b/drivers/spi/spi-bcm2835.c @@ -0,0 +1,1409 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Driver for Broadcom BCM2835 SPI Controllers + * + * Copyright (C) 2012 Chris Boot + * Copyright (C) 2013 Stephen Warren + * Copyright (C) 2015 Martin Sperl + * + * This driver is inspired by: + * spi-ath79.c, Copyright (C) 2009-2011 Gabor Juhos <juhosg@openwrt.org> + * spi-atmel.c, Copyright (C) 2006 Atmel Corporation + */ + +#include <linux/clk.h> +#include <linux/completion.h> +#include <linux/debugfs.h> +#include <linux/delay.h> +#include <linux/dma-mapping.h> +#include <linux/dmaengine.h> +#include <linux/err.h> +#include <linux/interrupt.h> +#include <linux/io.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/of.h> +#include <linux/of_address.h> +#include <linux/of_device.h> +#include <linux/gpio/consumer.h> +#include <linux/gpio/machine.h> /* FIXME: using chip internals */ +#include <linux/gpio/driver.h> /* FIXME: using chip internals */ +#include <linux/of_irq.h> +#include <linux/spi/spi.h> + +/* SPI register offsets */ +#define BCM2835_SPI_CS 0x00 +#define BCM2835_SPI_FIFO 0x04 +#define BCM2835_SPI_CLK 0x08 +#define BCM2835_SPI_DLEN 0x0c +#define BCM2835_SPI_LTOH 0x10 +#define BCM2835_SPI_DC 0x14 + +/* Bitfields in CS */ +#define BCM2835_SPI_CS_LEN_LONG 0x02000000 +#define BCM2835_SPI_CS_DMA_LEN 0x01000000 +#define BCM2835_SPI_CS_CSPOL2 0x00800000 +#define BCM2835_SPI_CS_CSPOL1 0x00400000 +#define BCM2835_SPI_CS_CSPOL0 0x00200000 +#define BCM2835_SPI_CS_RXF 0x00100000 +#define BCM2835_SPI_CS_RXR 0x00080000 +#define BCM2835_SPI_CS_TXD 0x00040000 +#define BCM2835_SPI_CS_RXD 0x00020000 +#define BCM2835_SPI_CS_DONE 0x00010000 +#define BCM2835_SPI_CS_LEN 0x00002000 +#define BCM2835_SPI_CS_REN 0x00001000 +#define BCM2835_SPI_CS_ADCS 0x00000800 +#define BCM2835_SPI_CS_INTR 0x00000400 +#define BCM2835_SPI_CS_INTD 0x00000200 +#define BCM2835_SPI_CS_DMAEN 0x00000100 +#define BCM2835_SPI_CS_TA 0x00000080 +#define BCM2835_SPI_CS_CSPOL 0x00000040 +#define BCM2835_SPI_CS_CLEAR_RX 0x00000020 +#define BCM2835_SPI_CS_CLEAR_TX 0x00000010 +#define BCM2835_SPI_CS_CPOL 0x00000008 +#define BCM2835_SPI_CS_CPHA 0x00000004 +#define BCM2835_SPI_CS_CS_10 0x00000002 +#define BCM2835_SPI_CS_CS_01 0x00000001 + +#define BCM2835_SPI_FIFO_SIZE 64 +#define BCM2835_SPI_FIFO_SIZE_3_4 48 +#define BCM2835_SPI_DMA_MIN_LENGTH 96 +#define BCM2835_SPI_NUM_CS 24 /* raise as necessary */ +#define BCM2835_SPI_MODE_BITS (SPI_CPOL | SPI_CPHA | SPI_CS_HIGH \ + | SPI_NO_CS | SPI_3WIRE) + +#define DRV_NAME "spi-bcm2835" + +/* define polling limits */ +static unsigned int polling_limit_us = 30; +module_param(polling_limit_us, uint, 0664); +MODULE_PARM_DESC(polling_limit_us, + "time in us to run a transfer in polling mode\n"); + +/** + * struct bcm2835_spi - BCM2835 SPI controller + * @regs: base address of register map + * @clk: core clock, divided to calculate serial clock + * @clk_hz: core clock cached speed + * @irq: interrupt, signals TX FIFO empty or RX FIFO ¾ full + * @tfr: SPI transfer currently processed + * @ctlr: SPI controller reverse lookup + * @tx_buf: pointer whence next transmitted byte is read + * @rx_buf: pointer where next received byte is written + * @tx_len: remaining bytes to transmit + * @rx_len: remaining bytes to receive + * @tx_prologue: bytes transmitted without DMA if first TX sglist entry's + * length is not a multiple of 4 (to overcome hardware limitation) + * @rx_prologue: bytes received without DMA if first RX sglist entry's + * length is not a multiple of 4 (to overcome hardware limitation) + * @tx_spillover: whether @tx_prologue spills over to second TX sglist entry + * @prepare_cs: precalculated CS register value for ->prepare_message() + * (uses slave-specific clock polarity and phase settings) + * @debugfs_dir: the debugfs directory - neede to remove debugfs when + * unloading the module + * @count_transfer_polling: count of how often polling mode is used + * @count_transfer_irq: count of how often interrupt mode is used + * @count_transfer_irq_after_polling: count of how often we fall back to + * interrupt mode after starting in polling mode. + * These are counted as well in @count_transfer_polling and + * @count_transfer_irq + * @count_transfer_dma: count how often dma mode is used + * @chip_select: SPI slave currently selected + * (used by bcm2835_spi_dma_tx_done() to write @clear_rx_cs) + * @tx_dma_active: whether a TX DMA descriptor is in progress + * @rx_dma_active: whether a RX DMA descriptor is in progress + * (used by bcm2835_spi_dma_tx_done() to handle a race) + * @fill_tx_desc: preallocated TX DMA descriptor used for RX-only transfers + * (cyclically copies from zero page to TX FIFO) + * @fill_tx_addr: bus address of zero page + * @clear_rx_desc: preallocated RX DMA descriptor used for TX-only transfers + * (cyclically clears RX FIFO by writing @clear_rx_cs to CS register) + * @clear_rx_addr: bus address of @clear_rx_cs + * @clear_rx_cs: precalculated CS register value to clear RX FIFO + * (uses slave-specific clock polarity and phase settings) + */ +struct bcm2835_spi { + void __iomem *regs; + struct clk *clk; + unsigned long clk_hz; + int irq; + struct spi_transfer *tfr; + struct spi_controller *ctlr; + const u8 *tx_buf; + u8 *rx_buf; + int tx_len; + int rx_len; + int tx_prologue; + int rx_prologue; + unsigned int tx_spillover; + u32 prepare_cs[BCM2835_SPI_NUM_CS]; + + struct dentry *debugfs_dir; + u64 count_transfer_polling; + u64 count_transfer_irq; + u64 count_transfer_irq_after_polling; + u64 count_transfer_dma; + + u8 chip_select; + unsigned int tx_dma_active; + unsigned int rx_dma_active; + struct dma_async_tx_descriptor *fill_tx_desc; + dma_addr_t fill_tx_addr; + struct dma_async_tx_descriptor *clear_rx_desc[BCM2835_SPI_NUM_CS]; + dma_addr_t clear_rx_addr; + u32 clear_rx_cs[BCM2835_SPI_NUM_CS] ____cacheline_aligned; +}; + +#if defined(CONFIG_DEBUG_FS) +static void bcm2835_debugfs_create(struct bcm2835_spi *bs, + const char *dname) +{ + char name[64]; + struct dentry *dir; + + /* get full name */ + snprintf(name, sizeof(name), "spi-bcm2835-%s", dname); + + /* the base directory */ + dir = debugfs_create_dir(name, NULL); + bs->debugfs_dir = dir; + + /* the counters */ + debugfs_create_u64("count_transfer_polling", 0444, dir, + &bs->count_transfer_polling); + debugfs_create_u64("count_transfer_irq", 0444, dir, + &bs->count_transfer_irq); + debugfs_create_u64("count_transfer_irq_after_polling", 0444, dir, + &bs->count_transfer_irq_after_polling); + debugfs_create_u64("count_transfer_dma", 0444, dir, + &bs->count_transfer_dma); +} + +static void bcm2835_debugfs_remove(struct bcm2835_spi *bs) +{ + debugfs_remove_recursive(bs->debugfs_dir); + bs->debugfs_dir = NULL; +} +#else +static void bcm2835_debugfs_create(struct bcm2835_spi *bs, + const char *dname) +{ +} + +static void bcm2835_debugfs_remove(struct bcm2835_spi *bs) +{ +} +#endif /* CONFIG_DEBUG_FS */ + +static inline u32 bcm2835_rd(struct bcm2835_spi *bs, unsigned int reg) +{ + return readl(bs->regs + reg); +} + +static inline void bcm2835_wr(struct bcm2835_spi *bs, unsigned int reg, u32 val) +{ + writel(val, bs->regs + reg); +} + +static inline void bcm2835_rd_fifo(struct bcm2835_spi *bs) +{ + u8 byte; + + while ((bs->rx_len) && + (bcm2835_rd(bs, BCM2835_SPI_CS) & BCM2835_SPI_CS_RXD)) { + byte = bcm2835_rd(bs, BCM2835_SPI_FIFO); + if (bs->rx_buf) + *bs->rx_buf++ = byte; + bs->rx_len--; + } +} + +static inline void bcm2835_wr_fifo(struct bcm2835_spi *bs) +{ + u8 byte; + + while ((bs->tx_len) && + (bcm2835_rd(bs, BCM2835_SPI_CS) & BCM2835_SPI_CS_TXD)) { + byte = bs->tx_buf ? *bs->tx_buf++ : 0; + bcm2835_wr(bs, BCM2835_SPI_FIFO, byte); + bs->tx_len--; + } +} + +/** + * bcm2835_rd_fifo_count() - blindly read exactly @count bytes from RX FIFO + * @bs: BCM2835 SPI controller + * @count: bytes to read from RX FIFO + * + * The caller must ensure that @bs->rx_len is greater than or equal to @count, + * that the RX FIFO contains at least @count bytes and that the DMA Enable flag + * in the CS register is set (such that a read from the FIFO register receives + * 32-bit instead of just 8-bit). Moreover @bs->rx_buf must not be %NULL. + */ +static inline void bcm2835_rd_fifo_count(struct bcm2835_spi *bs, int count) +{ + u32 val; + int len; + + bs->rx_len -= count; + + do { + val = bcm2835_rd(bs, BCM2835_SPI_FIFO); + len = min(count, 4); + memcpy(bs->rx_buf, &val, len); + bs->rx_buf += len; + count -= 4; + } while (count > 0); +} + +/** + * bcm2835_wr_fifo_count() - blindly write exactly @count bytes to TX FIFO + * @bs: BCM2835 SPI controller + * @count: bytes to write to TX FIFO + * + * The caller must ensure that @bs->tx_len is greater than or equal to @count, + * that the TX FIFO can accommodate @count bytes and that the DMA Enable flag + * in the CS register is set (such that a write to the FIFO register transmits + * 32-bit instead of just 8-bit). + */ +static inline void bcm2835_wr_fifo_count(struct bcm2835_spi *bs, int count) +{ + u32 val; + int len; + + bs->tx_len -= count; + + do { + if (bs->tx_buf) { + len = min(count, 4); + memcpy(&val, bs->tx_buf, len); + bs->tx_buf += len; + } else { + val = 0; + } + bcm2835_wr(bs, BCM2835_SPI_FIFO, val); + count -= 4; + } while (count > 0); +} + +/** + * bcm2835_wait_tx_fifo_empty() - busy-wait for TX FIFO to empty + * @bs: BCM2835 SPI controller + * + * The caller must ensure that the RX FIFO can accommodate as many bytes + * as have been written to the TX FIFO: Transmission is halted once the + * RX FIFO is full, causing this function to spin forever. + */ +static inline void bcm2835_wait_tx_fifo_empty(struct bcm2835_spi *bs) +{ + while (!(bcm2835_rd(bs, BCM2835_SPI_CS) & BCM2835_SPI_CS_DONE)) + cpu_relax(); +} + +/** + * bcm2835_rd_fifo_blind() - blindly read up to @count bytes from RX FIFO + * @bs: BCM2835 SPI controller + * @count: bytes available for reading in RX FIFO + */ +static inline void bcm2835_rd_fifo_blind(struct bcm2835_spi *bs, int count) +{ + u8 val; + + count = min(count, bs->rx_len); + bs->rx_len -= count; + + do { + val = bcm2835_rd(bs, BCM2835_SPI_FIFO); + if (bs->rx_buf) + *bs->rx_buf++ = val; + } while (--count); +} + +/** + * bcm2835_wr_fifo_blind() - blindly write up to @count bytes to TX FIFO + * @bs: BCM2835 SPI controller + * @count: bytes available for writing in TX FIFO + */ +static inline void bcm2835_wr_fifo_blind(struct bcm2835_spi *bs, int count) +{ + u8 val; + + count = min(count, bs->tx_len); + bs->tx_len -= count; + + do { + val = bs->tx_buf ? *bs->tx_buf++ : 0; + bcm2835_wr(bs, BCM2835_SPI_FIFO, val); + } while (--count); +} + +static void bcm2835_spi_reset_hw(struct bcm2835_spi *bs) +{ + u32 cs = bcm2835_rd(bs, BCM2835_SPI_CS); + + /* Disable SPI interrupts and transfer */ + cs &= ~(BCM2835_SPI_CS_INTR | + BCM2835_SPI_CS_INTD | + BCM2835_SPI_CS_DMAEN | + BCM2835_SPI_CS_TA); + /* + * Transmission sometimes breaks unless the DONE bit is written at the + * end of every transfer. The spec says it's a RO bit. Either the + * spec is wrong and the bit is actually of type RW1C, or it's a + * hardware erratum. + */ + cs |= BCM2835_SPI_CS_DONE; + /* and reset RX/TX FIFOS */ + cs |= BCM2835_SPI_CS_CLEAR_RX | BCM2835_SPI_CS_CLEAR_TX; + + /* and reset the SPI_HW */ + bcm2835_wr(bs, BCM2835_SPI_CS, cs); + /* as well as DLEN */ + bcm2835_wr(bs, BCM2835_SPI_DLEN, 0); +} + +static irqreturn_t bcm2835_spi_interrupt(int irq, void *dev_id) +{ + struct bcm2835_spi *bs = dev_id; + u32 cs = bcm2835_rd(bs, BCM2835_SPI_CS); + + /* + * An interrupt is signaled either if DONE is set (TX FIFO empty) + * or if RXR is set (RX FIFO >= ¾ full). + */ + if (cs & BCM2835_SPI_CS_RXF) + bcm2835_rd_fifo_blind(bs, BCM2835_SPI_FIFO_SIZE); + else if (cs & BCM2835_SPI_CS_RXR) + bcm2835_rd_fifo_blind(bs, BCM2835_SPI_FIFO_SIZE_3_4); + + if (bs->tx_len && cs & BCM2835_SPI_CS_DONE) + bcm2835_wr_fifo_blind(bs, BCM2835_SPI_FIFO_SIZE); + + /* Read as many bytes as possible from FIFO */ + bcm2835_rd_fifo(bs); + /* Write as many bytes as possible to FIFO */ + bcm2835_wr_fifo(bs); + + if (!bs->rx_len) { + /* Transfer complete - reset SPI HW */ + bcm2835_spi_reset_hw(bs); + /* wake up the framework */ + complete(&bs->ctlr->xfer_completion); + } + + return IRQ_HANDLED; +} + +static int bcm2835_spi_transfer_one_irq(struct spi_controller *ctlr, + struct spi_device *spi, + struct spi_transfer *tfr, + u32 cs, bool fifo_empty) +{ + struct bcm2835_spi *bs = spi_controller_get_devdata(ctlr); + + /* update usage statistics */ + bs->count_transfer_irq++; + + /* + * Enable HW block, but with interrupts still disabled. + * Otherwise the empty TX FIFO would immediately trigger an interrupt. + */ + bcm2835_wr(bs, BCM2835_SPI_CS, cs | BCM2835_SPI_CS_TA); + + /* fill TX FIFO as much as possible */ + if (fifo_empty) + bcm2835_wr_fifo_blind(bs, BCM2835_SPI_FIFO_SIZE); + bcm2835_wr_fifo(bs); + + /* enable interrupts */ + cs |= BCM2835_SPI_CS_INTR | BCM2835_SPI_CS_INTD | BCM2835_SPI_CS_TA; + bcm2835_wr(bs, BCM2835_SPI_CS, cs); + + /* signal that we need to wait for completion */ + return 1; +} + +/** + * bcm2835_spi_transfer_prologue() - transfer first few bytes without DMA + * @ctlr: SPI master controller + * @tfr: SPI transfer + * @bs: BCM2835 SPI controller + * @cs: CS register + * + * A limitation in DMA mode is that the FIFO must be accessed in 4 byte chunks. + * Only the final write access is permitted to transmit less than 4 bytes, the + * SPI controller deduces its intended size from the DLEN register. + * + * If a TX or RX sglist contains multiple entries, one per page, and the first + * entry starts in the middle of a page, that first entry's length may not be + * a multiple of 4. Subsequent entries are fine because they span an entire + * page, hence do have a length that's a multiple of 4. + * + * This cannot happen with kmalloc'ed buffers (which is what most clients use) + * because they are contiguous in physical memory and therefore not split on + * page boundaries by spi_map_buf(). But it *can* happen with vmalloc'ed + * buffers. + * + * The DMA engine is incapable of combining sglist entries into a continuous + * stream of 4 byte chunks, it treats every entry separately: A TX entry is + * rounded up a to a multiple of 4 bytes by transmitting surplus bytes, an RX + * entry is rounded up by throwing away received bytes. + * + * Overcome this limitation by transferring the first few bytes without DMA: + * E.g. if the first TX sglist entry's length is 23 and the first RX's is 42, + * write 3 bytes to the TX FIFO but read only 2 bytes from the RX FIFO. + * The residue of 1 byte in the RX FIFO is picked up by DMA. Together with + * the rest of the first RX sglist entry it makes up a multiple of 4 bytes. + * + * Should the RX prologue be larger, say, 3 vis-à -vis a TX prologue of 1, + * write 1 + 4 = 5 bytes to the TX FIFO and read 3 bytes from the RX FIFO. + * Caution, the additional 4 bytes spill over to the second TX sglist entry + * if the length of the first is *exactly* 1. + * + * At most 6 bytes are written and at most 3 bytes read. Do we know the + * transfer has this many bytes? Yes, see BCM2835_SPI_DMA_MIN_LENGTH. + * + * The FIFO is normally accessed with 8-bit width by the CPU and 32-bit width + * by the DMA engine. Toggling the DMA Enable flag in the CS register switches + * the width but also garbles the FIFO's contents. The prologue must therefore + * be transmitted in 32-bit width to ensure that the following DMA transfer can + * pick up the residue in the RX FIFO in ungarbled form. + */ +static void bcm2835_spi_transfer_prologue(struct spi_controller *ctlr, + struct spi_transfer *tfr, + struct bcm2835_spi *bs, + u32 cs) +{ + int tx_remaining; + + bs->tfr = tfr; + bs->tx_prologue = 0; + bs->rx_prologue = 0; + bs->tx_spillover = false; + + if (bs->tx_buf && !sg_is_last(&tfr->tx_sg.sgl[0])) + bs->tx_prologue = sg_dma_len(&tfr->tx_sg.sgl[0]) & 3; + + if (bs->rx_buf && !sg_is_last(&tfr->rx_sg.sgl[0])) { + bs->rx_prologue = sg_dma_len(&tfr->rx_sg.sgl[0]) & 3; + + if (bs->rx_prologue > bs->tx_prologue) { + if (!bs->tx_buf || sg_is_last(&tfr->tx_sg.sgl[0])) { + bs->tx_prologue = bs->rx_prologue; + } else { + bs->tx_prologue += 4; + bs->tx_spillover = + !(sg_dma_len(&tfr->tx_sg.sgl[0]) & ~3); + } + } + } + + /* rx_prologue > 0 implies tx_prologue > 0, so check only the latter */ + if (!bs->tx_prologue) + return; + + /* Write and read RX prologue. Adjust first entry in RX sglist. */ + if (bs->rx_prologue) { + bcm2835_wr(bs, BCM2835_SPI_DLEN, bs->rx_prologue); + bcm2835_wr(bs, BCM2835_SPI_CS, cs | BCM2835_SPI_CS_TA + | BCM2835_SPI_CS_DMAEN); + bcm2835_wr_fifo_count(bs, bs->rx_prologue); + bcm2835_wait_tx_fifo_empty(bs); + bcm2835_rd_fifo_count(bs, bs->rx_prologue); + bcm2835_wr(bs, BCM2835_SPI_CS, cs | BCM2835_SPI_CS_CLEAR_RX + | BCM2835_SPI_CS_CLEAR_TX + | BCM2835_SPI_CS_DONE); + + dma_sync_single_for_device(ctlr->dma_rx->device->dev, + sg_dma_address(&tfr->rx_sg.sgl[0]), + bs->rx_prologue, DMA_FROM_DEVICE); + + sg_dma_address(&tfr->rx_sg.sgl[0]) += bs->rx_prologue; + sg_dma_len(&tfr->rx_sg.sgl[0]) -= bs->rx_prologue; + } + + if (!bs->tx_buf) + return; + + /* + * Write remaining TX prologue. Adjust first entry in TX sglist. + * Also adjust second entry if prologue spills over to it. + */ + tx_remaining = bs->tx_prologue - bs->rx_prologue; + if (tx_remaining) { + bcm2835_wr(bs, BCM2835_SPI_DLEN, tx_remaining); + bcm2835_wr(bs, BCM2835_SPI_CS, cs | BCM2835_SPI_CS_TA + | BCM2835_SPI_CS_DMAEN); + bcm2835_wr_fifo_count(bs, tx_remaining); + bcm2835_wait_tx_fifo_empty(bs); + bcm2835_wr(bs, BCM2835_SPI_CS, cs | BCM2835_SPI_CS_CLEAR_TX + | BCM2835_SPI_CS_DONE); + } + + if (likely(!bs->tx_spillover)) { + sg_dma_address(&tfr->tx_sg.sgl[0]) += bs->tx_prologue; + sg_dma_len(&tfr->tx_sg.sgl[0]) -= bs->tx_prologue; + } else { + sg_dma_len(&tfr->tx_sg.sgl[0]) = 0; + sg_dma_address(&tfr->tx_sg.sgl[1]) += 4; + sg_dma_len(&tfr->tx_sg.sgl[1]) -= 4; + } +} + +/** + * bcm2835_spi_undo_prologue() - reconstruct original sglist state + * @bs: BCM2835 SPI controller + * + * Undo changes which were made to an SPI transfer's sglist when transmitting + * the prologue. This is necessary to ensure the same memory ranges are + * unmapped that were originally mapped. + */ +static void bcm2835_spi_undo_prologue(struct bcm2835_spi *bs) +{ + struct spi_transfer *tfr = bs->tfr; + + if (!bs->tx_prologue) + return; + + if (bs->rx_prologue) { + sg_dma_address(&tfr->rx_sg.sgl[0]) -= bs->rx_prologue; + sg_dma_len(&tfr->rx_sg.sgl[0]) += bs->rx_prologue; + } + + if (!bs->tx_buf) + goto out; + + if (likely(!bs->tx_spillover)) { + sg_dma_address(&tfr->tx_sg.sgl[0]) -= bs->tx_prologue; + sg_dma_len(&tfr->tx_sg.sgl[0]) += bs->tx_prologue; + } else { + sg_dma_len(&tfr->tx_sg.sgl[0]) = bs->tx_prologue - 4; + sg_dma_address(&tfr->tx_sg.sgl[1]) -= 4; + sg_dma_len(&tfr->tx_sg.sgl[1]) += 4; + } +out: + bs->tx_prologue = 0; +} + +/** + * bcm2835_spi_dma_rx_done() - callback for DMA RX channel + * @data: SPI master controller + * + * Used for bidirectional and RX-only transfers. + */ +static void bcm2835_spi_dma_rx_done(void *data) +{ + struct spi_controller *ctlr = data; + struct bcm2835_spi *bs = spi_controller_get_devdata(ctlr); + + /* terminate tx-dma as we do not have an irq for it + * because when the rx dma will terminate and this callback + * is called the tx-dma must have finished - can't get to this + * situation otherwise... + */ + dmaengine_terminate_async(ctlr->dma_tx); + bs->tx_dma_active = false; + bs->rx_dma_active = false; + bcm2835_spi_undo_prologue(bs); + + /* reset fifo and HW */ + bcm2835_spi_reset_hw(bs); + + /* and mark as completed */; + complete(&ctlr->xfer_completion); +} + +/** + * bcm2835_spi_dma_tx_done() - callback for DMA TX channel + * @data: SPI master controller + * + * Used for TX-only transfers. + */ +static void bcm2835_spi_dma_tx_done(void *data) +{ + struct spi_controller *ctlr = data; + struct bcm2835_spi *bs = spi_controller_get_devdata(ctlr); + + /* busy-wait for TX FIFO to empty */ + while (!(bcm2835_rd(bs, BCM2835_SPI_CS) & BCM2835_SPI_CS_DONE)) + bcm2835_wr(bs, BCM2835_SPI_CS, + bs->clear_rx_cs[bs->chip_select]); + + bs->tx_dma_active = false; + smp_wmb(); + + /* + * In case of a very short transfer, RX DMA may not have been + * issued yet. The onus is then on bcm2835_spi_transfer_one_dma() + * to terminate it immediately after issuing. + */ + if (cmpxchg(&bs->rx_dma_active, true, false)) + dmaengine_terminate_async(ctlr->dma_rx); + + bcm2835_spi_undo_prologue(bs); + bcm2835_spi_reset_hw(bs); + complete(&ctlr->xfer_completion); +} + +/** + * bcm2835_spi_prepare_sg() - prepare and submit DMA descriptor for sglist + * @ctlr: SPI master controller + * @spi: SPI slave + * @tfr: SPI transfer + * @bs: BCM2835 SPI controller + * @is_tx: whether to submit DMA descriptor for TX or RX sglist + * + * Prepare and submit a DMA descriptor for the TX or RX sglist of @tfr. + * Return 0 on success or a negative error number. + */ +static int bcm2835_spi_prepare_sg(struct spi_controller *ctlr, + struct spi_device *spi, + struct spi_transfer *tfr, + struct bcm2835_spi *bs, + bool is_tx) +{ + struct dma_chan *chan; + struct scatterlist *sgl; + unsigned int nents; + enum dma_transfer_direction dir; + unsigned long flags; + + struct dma_async_tx_descriptor *desc; + dma_cookie_t cookie; + + if (is_tx) { + dir = DMA_MEM_TO_DEV; + chan = ctlr->dma_tx; + nents = tfr->tx_sg.nents; + sgl = tfr->tx_sg.sgl; + flags = tfr->rx_buf ? 0 : DMA_PREP_INTERRUPT; + } else { + dir = DMA_DEV_TO_MEM; + chan = ctlr->dma_rx; + nents = tfr->rx_sg.nents; + sgl = tfr->rx_sg.sgl; + flags = DMA_PREP_INTERRUPT; + } + /* prepare the channel */ + desc = dmaengine_prep_slave_sg(chan, sgl, nents, dir, flags); + if (!desc) + return -EINVAL; + + /* + * Completion is signaled by the RX channel for bidirectional and + * RX-only transfers; else by the TX channel for TX-only transfers. + */ + if (!is_tx) { + desc->callback = bcm2835_spi_dma_rx_done; + desc->callback_param = ctlr; + } else if (!tfr->rx_buf) { + desc->callback = bcm2835_spi_dma_tx_done; + desc->callback_param = ctlr; + bs->chip_select = spi->chip_select; + } + + /* submit it to DMA-engine */ + cookie = dmaengine_submit(desc); + + return dma_submit_error(cookie); +} + +/** + * bcm2835_spi_transfer_one_dma() - perform SPI transfer using DMA engine + * @ctlr: SPI master controller + * @spi: SPI slave + * @tfr: SPI transfer + * @cs: CS register + * + * For *bidirectional* transfers (both tx_buf and rx_buf are non-%NULL), set up + * the TX and RX DMA channel to copy between memory and FIFO register. + * + * For *TX-only* transfers (rx_buf is %NULL), copying the RX FIFO's contents to + * memory is pointless. However not reading the RX FIFO isn't an option either + * because transmission is halted once it's full. As a workaround, cyclically + * clear the RX FIFO by setting the CLEAR_RX bit in the CS register. + * + * The CS register value is precalculated in bcm2835_spi_setup(). Normally + * this is called only once, on slave registration. A DMA descriptor to write + * this value is preallocated in bcm2835_dma_init(). All that's left to do + * when performing a TX-only transfer is to submit this descriptor to the RX + * DMA channel. Latency is thereby minimized. The descriptor does not + * generate any interrupts while running. It must be terminated once the + * TX DMA channel is done. + * + * Clearing the RX FIFO is paced by the DREQ signal. The signal is asserted + * when the RX FIFO becomes half full, i.e. 32 bytes. (Tuneable with the DC + * register.) Reading 32 bytes from the RX FIFO would normally require 8 bus + * accesses, whereas clearing it requires only 1 bus access. So an 8-fold + * reduction in bus traffic and thus energy consumption is achieved. + * + * For *RX-only* transfers (tx_buf is %NULL), fill the TX FIFO by cyclically + * copying from the zero page. The DMA descriptor to do this is preallocated + * in bcm2835_dma_init(). It must be terminated once the RX DMA channel is + * done and can then be reused. + * + * The BCM2835 DMA driver autodetects when a transaction copies from the zero + * page and utilizes the DMA controller's ability to synthesize zeroes instead + * of copying them from memory. This reduces traffic on the memory bus. The + * feature is not available on so-called "lite" channels, but normally TX DMA + * is backed by a full-featured channel. + * + * Zero-filling the TX FIFO is paced by the DREQ signal. Unfortunately the + * BCM2835 SPI controller continues to assert DREQ even after the DLEN register + * has been counted down to zero (hardware erratum). Thus, when the transfer + * has finished, the DMA engine zero-fills the TX FIFO until it is half full. + * (Tuneable with the DC register.) So up to 9 gratuitous bus accesses are + * performed at the end of an RX-only transfer. + */ +static int bcm2835_spi_transfer_one_dma(struct spi_controller *ctlr, + struct spi_device *spi, + struct spi_transfer *tfr, + u32 cs) +{ + struct bcm2835_spi *bs = spi_controller_get_devdata(ctlr); + dma_cookie_t cookie; + int ret; + + /* update usage statistics */ + bs->count_transfer_dma++; + + /* + * Transfer first few bytes without DMA if length of first TX or RX + * sglist entry is not a multiple of 4 bytes (hardware limitation). + */ + bcm2835_spi_transfer_prologue(ctlr, tfr, bs, cs); + + /* setup tx-DMA */ + if (bs->tx_buf) { + ret = bcm2835_spi_prepare_sg(ctlr, spi, tfr, bs, true); + } else { + cookie = dmaengine_submit(bs->fill_tx_desc); + ret = dma_submit_error(cookie); + } + if (ret) + goto err_reset_hw; + + /* set the DMA length */ + bcm2835_wr(bs, BCM2835_SPI_DLEN, bs->tx_len); + + /* start the HW */ + bcm2835_wr(bs, BCM2835_SPI_CS, + cs | BCM2835_SPI_CS_TA | BCM2835_SPI_CS_DMAEN); + + bs->tx_dma_active = true; + smp_wmb(); + + /* start TX early */ + dma_async_issue_pending(ctlr->dma_tx); + + /* setup rx-DMA late - to run transfers while + * mapping of the rx buffers still takes place + * this saves 10us or more. + */ + if (bs->rx_buf) { + ret = bcm2835_spi_prepare_sg(ctlr, spi, tfr, bs, false); + } else { + cookie = dmaengine_submit(bs->clear_rx_desc[spi->chip_select]); + ret = dma_submit_error(cookie); + } + if (ret) { + /* need to reset on errors */ + dmaengine_terminate_sync(ctlr->dma_tx); + bs->tx_dma_active = false; + goto err_reset_hw; + } + + /* start rx dma late */ + dma_async_issue_pending(ctlr->dma_rx); + bs->rx_dma_active = true; + smp_mb(); + + /* + * In case of a very short TX-only transfer, bcm2835_spi_dma_tx_done() + * may run before RX DMA is issued. Terminate RX DMA if so. + */ + if (!bs->rx_buf && !bs->tx_dma_active && + cmpxchg(&bs->rx_dma_active, true, false)) { + dmaengine_terminate_async(ctlr->dma_rx); + bcm2835_spi_reset_hw(bs); + } + + /* wait for wakeup in framework */ + return 1; + +err_reset_hw: + bcm2835_spi_reset_hw(bs); + bcm2835_spi_undo_prologue(bs); + return ret; +} + +static bool bcm2835_spi_can_dma(struct spi_controller *ctlr, + struct spi_device *spi, + struct spi_transfer *tfr) +{ + /* we start DMA efforts only on bigger transfers */ + if (tfr->len < BCM2835_SPI_DMA_MIN_LENGTH) + return false; + + /* return OK */ + return true; +} + +static void bcm2835_dma_release(struct spi_controller *ctlr, + struct bcm2835_spi *bs) +{ + int i; + + if (ctlr->dma_tx) { + dmaengine_terminate_sync(ctlr->dma_tx); + + if (bs->fill_tx_desc) + dmaengine_desc_free(bs->fill_tx_desc); + + if (bs->fill_tx_addr) + dma_unmap_page_attrs(ctlr->dma_tx->device->dev, + bs->fill_tx_addr, sizeof(u32), + DMA_TO_DEVICE, + DMA_ATTR_SKIP_CPU_SYNC); + + dma_release_channel(ctlr->dma_tx); + ctlr->dma_tx = NULL; + } + + if (ctlr->dma_rx) { + dmaengine_terminate_sync(ctlr->dma_rx); + + for (i = 0; i < BCM2835_SPI_NUM_CS; i++) + if (bs->clear_rx_desc[i]) + dmaengine_desc_free(bs->clear_rx_desc[i]); + + if (bs->clear_rx_addr) + dma_unmap_single(ctlr->dma_rx->device->dev, + bs->clear_rx_addr, + sizeof(bs->clear_rx_cs), + DMA_TO_DEVICE); + + dma_release_channel(ctlr->dma_rx); + ctlr->dma_rx = NULL; + } +} + +static int bcm2835_dma_init(struct spi_controller *ctlr, struct device *dev, + struct bcm2835_spi *bs) +{ + struct dma_slave_config slave_config; + const __be32 *addr; + dma_addr_t dma_reg_base; + int ret, i; + + /* base address in dma-space */ + addr = of_get_address(ctlr->dev.of_node, 0, NULL, NULL); + if (!addr) { + dev_err(dev, "could not get DMA-register address - not using dma mode\n"); + /* Fall back to interrupt mode */ + return 0; + } + dma_reg_base = be32_to_cpup(addr); + + /* get tx/rx dma */ + ctlr->dma_tx = dma_request_chan(dev, "tx"); + if (IS_ERR(ctlr->dma_tx)) { + dev_err(dev, "no tx-dma configuration found - not using dma mode\n"); + ret = PTR_ERR(ctlr->dma_tx); + ctlr->dma_tx = NULL; + goto err; + } + ctlr->dma_rx = dma_request_chan(dev, "rx"); + if (IS_ERR(ctlr->dma_rx)) { + dev_err(dev, "no rx-dma configuration found - not using dma mode\n"); + ret = PTR_ERR(ctlr->dma_rx); + ctlr->dma_rx = NULL; + goto err_release; + } + + /* + * The TX DMA channel either copies a transfer's TX buffer to the FIFO + * or, in case of an RX-only transfer, cyclically copies from the zero + * page to the FIFO using a preallocated, reusable descriptor. + */ + slave_config.dst_addr = (u32)(dma_reg_base + BCM2835_SPI_FIFO); + slave_config.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES; + + ret = dmaengine_slave_config(ctlr->dma_tx, &slave_config); + if (ret) + goto err_config; + + bs->fill_tx_addr = dma_map_page_attrs(ctlr->dma_tx->device->dev, + ZERO_PAGE(0), 0, sizeof(u32), + DMA_TO_DEVICE, + DMA_ATTR_SKIP_CPU_SYNC); + if (dma_mapping_error(ctlr->dma_tx->device->dev, bs->fill_tx_addr)) { + dev_err(dev, "cannot map zero page - not using DMA mode\n"); + bs->fill_tx_addr = 0; + ret = -ENOMEM; + goto err_release; + } + + bs->fill_tx_desc = dmaengine_prep_dma_cyclic(ctlr->dma_tx, + bs->fill_tx_addr, + sizeof(u32), 0, + DMA_MEM_TO_DEV, 0); + if (!bs->fill_tx_desc) { + dev_err(dev, "cannot prepare fill_tx_desc - not using DMA mode\n"); + ret = -ENOMEM; + goto err_release; + } + + ret = dmaengine_desc_set_reuse(bs->fill_tx_desc); + if (ret) { + dev_err(dev, "cannot reuse fill_tx_desc - not using DMA mode\n"); + goto err_release; + } + + /* + * The RX DMA channel is used bidirectionally: It either reads the + * RX FIFO or, in case of a TX-only transfer, cyclically writes a + * precalculated value to the CS register to clear the RX FIFO. + */ + slave_config.src_addr = (u32)(dma_reg_base + BCM2835_SPI_FIFO); + slave_config.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES; + slave_config.dst_addr = (u32)(dma_reg_base + BCM2835_SPI_CS); + slave_config.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES; + + ret = dmaengine_slave_config(ctlr->dma_rx, &slave_config); + if (ret) + goto err_config; + + bs->clear_rx_addr = dma_map_single(ctlr->dma_rx->device->dev, + bs->clear_rx_cs, + sizeof(bs->clear_rx_cs), + DMA_TO_DEVICE); + if (dma_mapping_error(ctlr->dma_rx->device->dev, bs->clear_rx_addr)) { + dev_err(dev, "cannot map clear_rx_cs - not using DMA mode\n"); + bs->clear_rx_addr = 0; + ret = -ENOMEM; + goto err_release; + } + + for (i = 0; i < BCM2835_SPI_NUM_CS; i++) { + bs->clear_rx_desc[i] = dmaengine_prep_dma_cyclic(ctlr->dma_rx, + bs->clear_rx_addr + i * sizeof(u32), + sizeof(u32), 0, + DMA_MEM_TO_DEV, 0); + if (!bs->clear_rx_desc[i]) { + dev_err(dev, "cannot prepare clear_rx_desc - not using DMA mode\n"); + ret = -ENOMEM; + goto err_release; + } + + ret = dmaengine_desc_set_reuse(bs->clear_rx_desc[i]); + if (ret) { + dev_err(dev, "cannot reuse clear_rx_desc - not using DMA mode\n"); + goto err_release; + } + } + + /* all went well, so set can_dma */ + ctlr->can_dma = bcm2835_spi_can_dma; + + return 0; + +err_config: + dev_err(dev, "issue configuring dma: %d - not using DMA mode\n", + ret); +err_release: + bcm2835_dma_release(ctlr, bs); +err: + /* + * Only report error for deferred probing, otherwise fall back to + * interrupt mode + */ + if (ret != -EPROBE_DEFER) + ret = 0; + + return ret; +} + +static int bcm2835_spi_transfer_one_poll(struct spi_controller *ctlr, + struct spi_device *spi, + struct spi_transfer *tfr, + u32 cs) +{ + struct bcm2835_spi *bs = spi_controller_get_devdata(ctlr); + unsigned long timeout; + + /* update usage statistics */ + bs->count_transfer_polling++; + + /* enable HW block without interrupts */ + bcm2835_wr(bs, BCM2835_SPI_CS, cs | BCM2835_SPI_CS_TA); + + /* fill in the fifo before timeout calculations + * if we are interrupted here, then the data is + * getting transferred by the HW while we are interrupted + */ + bcm2835_wr_fifo_blind(bs, BCM2835_SPI_FIFO_SIZE); + + /* set the timeout to at least 2 jiffies */ + timeout = jiffies + 2 + HZ * polling_limit_us / 1000000; + + /* loop until finished the transfer */ + while (bs->rx_len) { + /* fill in tx fifo with remaining data */ + bcm2835_wr_fifo(bs); + + /* read from fifo as much as possible */ + bcm2835_rd_fifo(bs); + + /* if there is still data pending to read + * then check the timeout + */ + if (bs->rx_len && time_after(jiffies, timeout)) { + dev_dbg_ratelimited(&spi->dev, + "timeout period reached: jiffies: %lu remaining tx/rx: %d/%d - falling back to interrupt mode\n", + jiffies - timeout, + bs->tx_len, bs->rx_len); + /* fall back to interrupt mode */ + + /* update usage statistics */ + bs->count_transfer_irq_after_polling++; + + return bcm2835_spi_transfer_one_irq(ctlr, spi, + tfr, cs, false); + } + } + + /* Transfer complete - reset SPI HW */ + bcm2835_spi_reset_hw(bs); + /* and return without waiting for completion */ + return 0; +} + +static int bcm2835_spi_transfer_one(struct spi_controller *ctlr, + struct spi_device *spi, + struct spi_transfer *tfr) +{ + struct bcm2835_spi *bs = spi_controller_get_devdata(ctlr); + unsigned long spi_hz, cdiv; + unsigned long hz_per_byte, byte_limit; + u32 cs = bs->prepare_cs[spi->chip_select]; + + /* set clock */ + spi_hz = tfr->speed_hz; + + if (spi_hz >= bs->clk_hz / 2) { + cdiv = 2; /* clk_hz/2 is the fastest we can go */ + } else if (spi_hz) { + /* CDIV must be a multiple of two */ + cdiv = DIV_ROUND_UP(bs->clk_hz, spi_hz); + cdiv += (cdiv % 2); + + if (cdiv >= 65536) + cdiv = 0; /* 0 is the slowest we can go */ + } else { + cdiv = 0; /* 0 is the slowest we can go */ + } + tfr->effective_speed_hz = cdiv ? (bs->clk_hz / cdiv) : (bs->clk_hz / 65536); + bcm2835_wr(bs, BCM2835_SPI_CLK, cdiv); + + /* handle all the 3-wire mode */ + if (spi->mode & SPI_3WIRE && tfr->rx_buf) + cs |= BCM2835_SPI_CS_REN; + + /* set transmit buffers and length */ + bs->tx_buf = tfr->tx_buf; + bs->rx_buf = tfr->rx_buf; + bs->tx_len = tfr->len; + bs->rx_len = tfr->len; + + /* Calculate the estimated time in us the transfer runs. Note that + * there is 1 idle clocks cycles after each byte getting transferred + * so we have 9 cycles/byte. This is used to find the number of Hz + * per byte per polling limit. E.g., we can transfer 1 byte in 30 us + * per 300,000 Hz of bus clock. + */ + hz_per_byte = polling_limit_us ? (9 * 1000000) / polling_limit_us : 0; + byte_limit = hz_per_byte ? tfr->effective_speed_hz / hz_per_byte : 1; + + /* run in polling mode for short transfers */ + if (tfr->len < byte_limit) + return bcm2835_spi_transfer_one_poll(ctlr, spi, tfr, cs); + + /* run in dma mode if conditions are right + * Note that unlike poll or interrupt mode DMA mode does not have + * this 1 idle clock cycle pattern but runs the spi clock without gaps + */ + if (ctlr->can_dma && bcm2835_spi_can_dma(ctlr, spi, tfr)) + return bcm2835_spi_transfer_one_dma(ctlr, spi, tfr, cs); + + /* run in interrupt-mode */ + return bcm2835_spi_transfer_one_irq(ctlr, spi, tfr, cs, true); +} + +static int bcm2835_spi_prepare_message(struct spi_controller *ctlr, + struct spi_message *msg) +{ + struct spi_device *spi = msg->spi; + struct bcm2835_spi *bs = spi_controller_get_devdata(ctlr); + int ret; + + if (ctlr->can_dma) { + /* + * DMA transfers are limited to 16 bit (0 to 65535 bytes) by + * the SPI HW due to DLEN. Split up transfers (32-bit FIFO + * aligned) if the limit is exceeded. + */ + ret = spi_split_transfers_maxsize(ctlr, msg, 65532, + GFP_KERNEL | GFP_DMA); + if (ret) + return ret; + } + + /* + * Set up clock polarity before spi_transfer_one_message() asserts + * chip select to avoid a gratuitous clock signal edge. + */ + bcm2835_wr(bs, BCM2835_SPI_CS, bs->prepare_cs[spi->chip_select]); + + return 0; +} + +static void bcm2835_spi_handle_err(struct spi_controller *ctlr, + struct spi_message *msg) +{ + struct bcm2835_spi *bs = spi_controller_get_devdata(ctlr); + + /* if an error occurred and we have an active dma, then terminate */ + if (ctlr->dma_tx) { + dmaengine_terminate_sync(ctlr->dma_tx); + bs->tx_dma_active = false; + } + if (ctlr->dma_rx) { + dmaengine_terminate_sync(ctlr->dma_rx); + bs->rx_dma_active = false; + } + bcm2835_spi_undo_prologue(bs); + + /* and reset */ + bcm2835_spi_reset_hw(bs); +} + +static int chip_match_name(struct gpio_chip *chip, void *data) +{ + return !strcmp(chip->label, data); +} + +static int bcm2835_spi_setup(struct spi_device *spi) +{ + struct spi_controller *ctlr = spi->controller; + struct bcm2835_spi *bs = spi_controller_get_devdata(ctlr); + struct gpio_chip *chip; + u32 cs; + + if (spi->chip_select >= BCM2835_SPI_NUM_CS) { + dev_err(&spi->dev, "only %d chip-selects supported\n", + BCM2835_SPI_NUM_CS - 1); + return -EINVAL; + } + + /* + * Precalculate SPI slave's CS register value for ->prepare_message(): + * The driver always uses software-controlled GPIO chip select, hence + * set the hardware-controlled native chip select to an invalid value + * to prevent it from interfering. + */ + cs = BCM2835_SPI_CS_CS_10 | BCM2835_SPI_CS_CS_01; + if (spi->mode & SPI_CPOL) + cs |= BCM2835_SPI_CS_CPOL; + if (spi->mode & SPI_CPHA) + cs |= BCM2835_SPI_CS_CPHA; + bs->prepare_cs[spi->chip_select] = cs; + + /* + * Precalculate SPI slave's CS register value to clear RX FIFO + * in case of a TX-only DMA transfer. + */ + if (ctlr->dma_rx) { + bs->clear_rx_cs[spi->chip_select] = cs | + BCM2835_SPI_CS_TA | + BCM2835_SPI_CS_DMAEN | + BCM2835_SPI_CS_CLEAR_RX; + dma_sync_single_for_device(ctlr->dma_rx->device->dev, + bs->clear_rx_addr, + sizeof(bs->clear_rx_cs), + DMA_TO_DEVICE); + } + + /* + * sanity checking the native-chipselects + */ + if (spi->mode & SPI_NO_CS) + return 0; + /* + * The SPI core has successfully requested the CS GPIO line from the + * device tree, so we are done. + */ + if (spi->cs_gpiod) + return 0; + if (spi->chip_select > 1) { + /* error in the case of native CS requested with CS > 1 + * officially there is a CS2, but it is not documented + * which GPIO is connected with that... + */ + dev_err(&spi->dev, + "setup: only two native chip-selects are supported\n"); + return -EINVAL; + } + + /* + * Translate native CS to GPIO + * + * FIXME: poking around in the gpiolib internals like this is + * not very good practice. Find a way to locate the real problem + * and fix it. Why is the GPIO descriptor in spi->cs_gpiod + * sometimes not assigned correctly? Erroneous device trees? + */ + + /* get the gpio chip for the base */ + chip = gpiochip_find("pinctrl-bcm2835", chip_match_name); + if (!chip) + return 0; + + spi->cs_gpiod = gpiochip_request_own_desc(chip, 8 - spi->chip_select, + DRV_NAME, + GPIO_LOOKUP_FLAGS_DEFAULT, + GPIOD_OUT_LOW); + if (IS_ERR(spi->cs_gpiod)) + return PTR_ERR(spi->cs_gpiod); + + /* and set up the "mode" and level */ + dev_info(&spi->dev, "setting up native-CS%i to use GPIO\n", + spi->chip_select); + + return 0; +} + +static int bcm2835_spi_probe(struct platform_device *pdev) +{ + struct spi_controller *ctlr; + struct bcm2835_spi *bs; + int err; + + ctlr = devm_spi_alloc_master(&pdev->dev, ALIGN(sizeof(*bs), + dma_get_cache_alignment())); + if (!ctlr) + return -ENOMEM; + + platform_set_drvdata(pdev, ctlr); + + ctlr->use_gpio_descriptors = true; + ctlr->mode_bits = BCM2835_SPI_MODE_BITS; + ctlr->bits_per_word_mask = SPI_BPW_MASK(8); + ctlr->num_chipselect = 3; + ctlr->setup = bcm2835_spi_setup; + ctlr->transfer_one = bcm2835_spi_transfer_one; + ctlr->handle_err = bcm2835_spi_handle_err; + ctlr->prepare_message = bcm2835_spi_prepare_message; + ctlr->dev.of_node = pdev->dev.of_node; + + bs = spi_controller_get_devdata(ctlr); + bs->ctlr = ctlr; + + bs->regs = devm_platform_ioremap_resource(pdev, 0); + if (IS_ERR(bs->regs)) + return PTR_ERR(bs->regs); + + bs->clk = devm_clk_get(&pdev->dev, NULL); + if (IS_ERR(bs->clk)) + return dev_err_probe(&pdev->dev, PTR_ERR(bs->clk), + "could not get clk\n"); + + bs->irq = platform_get_irq(pdev, 0); + if (bs->irq <= 0) + return bs->irq ? bs->irq : -ENODEV; + + clk_prepare_enable(bs->clk); + bs->clk_hz = clk_get_rate(bs->clk); + + err = bcm2835_dma_init(ctlr, &pdev->dev, bs); + if (err) + goto out_clk_disable; + + /* initialise the hardware with the default polarities */ + bcm2835_wr(bs, BCM2835_SPI_CS, + BCM2835_SPI_CS_CLEAR_RX | BCM2835_SPI_CS_CLEAR_TX); + + err = devm_request_irq(&pdev->dev, bs->irq, bcm2835_spi_interrupt, 0, + dev_name(&pdev->dev), bs); + if (err) { + dev_err(&pdev->dev, "could not request IRQ: %d\n", err); + goto out_dma_release; + } + + err = spi_register_controller(ctlr); + if (err) { + dev_err(&pdev->dev, "could not register SPI controller: %d\n", + err); + goto out_dma_release; + } + + bcm2835_debugfs_create(bs, dev_name(&pdev->dev)); + + return 0; + +out_dma_release: + bcm2835_dma_release(ctlr, bs); +out_clk_disable: + clk_disable_unprepare(bs->clk); + return err; +} + +static int bcm2835_spi_remove(struct platform_device *pdev) +{ + struct spi_controller *ctlr = platform_get_drvdata(pdev); + struct bcm2835_spi *bs = spi_controller_get_devdata(ctlr); + + bcm2835_debugfs_remove(bs); + + spi_unregister_controller(ctlr); + + bcm2835_dma_release(ctlr, bs); + + /* Clear FIFOs, and disable the HW block */ + bcm2835_wr(bs, BCM2835_SPI_CS, + BCM2835_SPI_CS_CLEAR_RX | BCM2835_SPI_CS_CLEAR_TX); + + clk_disable_unprepare(bs->clk); + + return 0; +} + +static void bcm2835_spi_shutdown(struct platform_device *pdev) +{ + int ret; + + ret = bcm2835_spi_remove(pdev); + if (ret) + dev_err(&pdev->dev, "failed to shutdown\n"); +} + +static const struct of_device_id bcm2835_spi_match[] = { + { .compatible = "brcm,bcm2835-spi", }, + {} +}; +MODULE_DEVICE_TABLE(of, bcm2835_spi_match); + +static struct platform_driver bcm2835_spi_driver = { + .driver = { + .name = DRV_NAME, + .of_match_table = bcm2835_spi_match, + }, + .probe = bcm2835_spi_probe, + .remove = bcm2835_spi_remove, + .shutdown = bcm2835_spi_shutdown, +}; +module_platform_driver(bcm2835_spi_driver); + +MODULE_DESCRIPTION("SPI controller driver for Broadcom BCM2835"); +MODULE_AUTHOR("Chris Boot <bootc@bootc.net>"); +MODULE_LICENSE("GPL"); diff --git a/drivers/spi/spi-bcm2835aux.c b/drivers/spi/spi-bcm2835aux.c new file mode 100644 index 000000000..1a26865c4 --- /dev/null +++ b/drivers/spi/spi-bcm2835aux.c @@ -0,0 +1,618 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Driver for Broadcom BCM2835 auxiliary SPI Controllers + * + * the driver does not rely on the native chipselects at all + * but only uses the gpio type chipselects + * + * Based on: spi-bcm2835.c + * + * Copyright (C) 2015 Martin Sperl + */ + +#include <linux/clk.h> +#include <linux/completion.h> +#include <linux/debugfs.h> +#include <linux/delay.h> +#include <linux/err.h> +#include <linux/interrupt.h> +#include <linux/io.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/of.h> +#include <linux/of_address.h> +#include <linux/of_device.h> +#include <linux/of_gpio.h> +#include <linux/of_irq.h> +#include <linux/regmap.h> +#include <linux/spi/spi.h> +#include <linux/spinlock.h> + +/* define polling limits */ +static unsigned int polling_limit_us = 30; +module_param(polling_limit_us, uint, 0664); +MODULE_PARM_DESC(polling_limit_us, + "time in us to run a transfer in polling mode - if zero no polling is used\n"); + +/* + * spi register defines + * + * note there is garbage in the "official" documentation, + * so some data is taken from the file: + * brcm_usrlib/dag/vmcsx/vcinclude/bcm2708_chip/aux_io.h + * inside of: + * http://www.broadcom.com/docs/support/videocore/Brcm_Android_ICS_Graphics_Stack.tar.gz + */ + +/* SPI register offsets */ +#define BCM2835_AUX_SPI_CNTL0 0x00 +#define BCM2835_AUX_SPI_CNTL1 0x04 +#define BCM2835_AUX_SPI_STAT 0x08 +#define BCM2835_AUX_SPI_PEEK 0x0C +#define BCM2835_AUX_SPI_IO 0x20 +#define BCM2835_AUX_SPI_TXHOLD 0x30 + +/* Bitfields in CNTL0 */ +#define BCM2835_AUX_SPI_CNTL0_SPEED 0xFFF00000 +#define BCM2835_AUX_SPI_CNTL0_SPEED_MAX 0xFFF +#define BCM2835_AUX_SPI_CNTL0_SPEED_SHIFT 20 +#define BCM2835_AUX_SPI_CNTL0_CS 0x000E0000 +#define BCM2835_AUX_SPI_CNTL0_POSTINPUT 0x00010000 +#define BCM2835_AUX_SPI_CNTL0_VAR_CS 0x00008000 +#define BCM2835_AUX_SPI_CNTL0_VAR_WIDTH 0x00004000 +#define BCM2835_AUX_SPI_CNTL0_DOUTHOLD 0x00003000 +#define BCM2835_AUX_SPI_CNTL0_ENABLE 0x00000800 +#define BCM2835_AUX_SPI_CNTL0_IN_RISING 0x00000400 +#define BCM2835_AUX_SPI_CNTL0_CLEARFIFO 0x00000200 +#define BCM2835_AUX_SPI_CNTL0_OUT_RISING 0x00000100 +#define BCM2835_AUX_SPI_CNTL0_CPOL 0x00000080 +#define BCM2835_AUX_SPI_CNTL0_MSBF_OUT 0x00000040 +#define BCM2835_AUX_SPI_CNTL0_SHIFTLEN 0x0000003F + +/* Bitfields in CNTL1 */ +#define BCM2835_AUX_SPI_CNTL1_CSHIGH 0x00000700 +#define BCM2835_AUX_SPI_CNTL1_TXEMPTY 0x00000080 +#define BCM2835_AUX_SPI_CNTL1_IDLE 0x00000040 +#define BCM2835_AUX_SPI_CNTL1_MSBF_IN 0x00000002 +#define BCM2835_AUX_SPI_CNTL1_KEEP_IN 0x00000001 + +/* Bitfields in STAT */ +#define BCM2835_AUX_SPI_STAT_TX_LVL 0xFF000000 +#define BCM2835_AUX_SPI_STAT_RX_LVL 0x00FF0000 +#define BCM2835_AUX_SPI_STAT_TX_FULL 0x00000400 +#define BCM2835_AUX_SPI_STAT_TX_EMPTY 0x00000200 +#define BCM2835_AUX_SPI_STAT_RX_FULL 0x00000100 +#define BCM2835_AUX_SPI_STAT_RX_EMPTY 0x00000080 +#define BCM2835_AUX_SPI_STAT_BUSY 0x00000040 +#define BCM2835_AUX_SPI_STAT_BITCOUNT 0x0000003F + +struct bcm2835aux_spi { + void __iomem *regs; + struct clk *clk; + int irq; + u32 cntl[2]; + const u8 *tx_buf; + u8 *rx_buf; + int tx_len; + int rx_len; + int pending; + + u64 count_transfer_polling; + u64 count_transfer_irq; + u64 count_transfer_irq_after_poll; + + struct dentry *debugfs_dir; +}; + +#if defined(CONFIG_DEBUG_FS) +static void bcm2835aux_debugfs_create(struct bcm2835aux_spi *bs, + const char *dname) +{ + char name[64]; + struct dentry *dir; + + /* get full name */ + snprintf(name, sizeof(name), "spi-bcm2835aux-%s", dname); + + /* the base directory */ + dir = debugfs_create_dir(name, NULL); + bs->debugfs_dir = dir; + + /* the counters */ + debugfs_create_u64("count_transfer_polling", 0444, dir, + &bs->count_transfer_polling); + debugfs_create_u64("count_transfer_irq", 0444, dir, + &bs->count_transfer_irq); + debugfs_create_u64("count_transfer_irq_after_poll", 0444, dir, + &bs->count_transfer_irq_after_poll); +} + +static void bcm2835aux_debugfs_remove(struct bcm2835aux_spi *bs) +{ + debugfs_remove_recursive(bs->debugfs_dir); + bs->debugfs_dir = NULL; +} +#else +static void bcm2835aux_debugfs_create(struct bcm2835aux_spi *bs, + const char *dname) +{ +} + +static void bcm2835aux_debugfs_remove(struct bcm2835aux_spi *bs) +{ +} +#endif /* CONFIG_DEBUG_FS */ + +static inline u32 bcm2835aux_rd(struct bcm2835aux_spi *bs, unsigned reg) +{ + return readl(bs->regs + reg); +} + +static inline void bcm2835aux_wr(struct bcm2835aux_spi *bs, unsigned reg, + u32 val) +{ + writel(val, bs->regs + reg); +} + +static inline void bcm2835aux_rd_fifo(struct bcm2835aux_spi *bs) +{ + u32 data; + int count = min(bs->rx_len, 3); + + data = bcm2835aux_rd(bs, BCM2835_AUX_SPI_IO); + if (bs->rx_buf) { + switch (count) { + case 3: + *bs->rx_buf++ = (data >> 16) & 0xff; + fallthrough; + case 2: + *bs->rx_buf++ = (data >> 8) & 0xff; + fallthrough; + case 1: + *bs->rx_buf++ = (data >> 0) & 0xff; + /* fallthrough - no default */ + } + } + bs->rx_len -= count; + bs->pending -= count; +} + +static inline void bcm2835aux_wr_fifo(struct bcm2835aux_spi *bs) +{ + u32 data; + u8 byte; + int count; + int i; + + /* gather up to 3 bytes to write to the FIFO */ + count = min(bs->tx_len, 3); + data = 0; + for (i = 0; i < count; i++) { + byte = bs->tx_buf ? *bs->tx_buf++ : 0; + data |= byte << (8 * (2 - i)); + } + + /* and set the variable bit-length */ + data |= (count * 8) << 24; + + /* and decrement length */ + bs->tx_len -= count; + bs->pending += count; + + /* write to the correct TX-register */ + if (bs->tx_len) + bcm2835aux_wr(bs, BCM2835_AUX_SPI_TXHOLD, data); + else + bcm2835aux_wr(bs, BCM2835_AUX_SPI_IO, data); +} + +static void bcm2835aux_spi_reset_hw(struct bcm2835aux_spi *bs) +{ + /* disable spi clearing fifo and interrupts */ + bcm2835aux_wr(bs, BCM2835_AUX_SPI_CNTL1, 0); + bcm2835aux_wr(bs, BCM2835_AUX_SPI_CNTL0, + BCM2835_AUX_SPI_CNTL0_CLEARFIFO); +} + +static void bcm2835aux_spi_transfer_helper(struct bcm2835aux_spi *bs) +{ + u32 stat = bcm2835aux_rd(bs, BCM2835_AUX_SPI_STAT); + + /* check if we have data to read */ + for (; bs->rx_len && (stat & BCM2835_AUX_SPI_STAT_RX_LVL); + stat = bcm2835aux_rd(bs, BCM2835_AUX_SPI_STAT)) + bcm2835aux_rd_fifo(bs); + + /* check if we have data to write */ + while (bs->tx_len && + (bs->pending < 12) && + (!(bcm2835aux_rd(bs, BCM2835_AUX_SPI_STAT) & + BCM2835_AUX_SPI_STAT_TX_FULL))) { + bcm2835aux_wr_fifo(bs); + } +} + +static irqreturn_t bcm2835aux_spi_interrupt(int irq, void *dev_id) +{ + struct spi_master *master = dev_id; + struct bcm2835aux_spi *bs = spi_master_get_devdata(master); + + /* IRQ may be shared, so return if our interrupts are disabled */ + if (!(bcm2835aux_rd(bs, BCM2835_AUX_SPI_CNTL1) & + (BCM2835_AUX_SPI_CNTL1_TXEMPTY | BCM2835_AUX_SPI_CNTL1_IDLE))) + return IRQ_NONE; + + /* do common fifo handling */ + bcm2835aux_spi_transfer_helper(bs); + + if (!bs->tx_len) { + /* disable tx fifo empty interrupt */ + bcm2835aux_wr(bs, BCM2835_AUX_SPI_CNTL1, bs->cntl[1] | + BCM2835_AUX_SPI_CNTL1_IDLE); + } + + /* and if rx_len is 0 then disable interrupts and wake up completion */ + if (!bs->rx_len) { + bcm2835aux_wr(bs, BCM2835_AUX_SPI_CNTL1, bs->cntl[1]); + complete(&master->xfer_completion); + } + + return IRQ_HANDLED; +} + +static int __bcm2835aux_spi_transfer_one_irq(struct spi_master *master, + struct spi_device *spi, + struct spi_transfer *tfr) +{ + struct bcm2835aux_spi *bs = spi_master_get_devdata(master); + + /* enable interrupts */ + bcm2835aux_wr(bs, BCM2835_AUX_SPI_CNTL1, bs->cntl[1] | + BCM2835_AUX_SPI_CNTL1_TXEMPTY | + BCM2835_AUX_SPI_CNTL1_IDLE); + + /* and wait for finish... */ + return 1; +} + +static int bcm2835aux_spi_transfer_one_irq(struct spi_master *master, + struct spi_device *spi, + struct spi_transfer *tfr) +{ + struct bcm2835aux_spi *bs = spi_master_get_devdata(master); + + /* update statistics */ + bs->count_transfer_irq++; + + /* fill in registers and fifos before enabling interrupts */ + bcm2835aux_wr(bs, BCM2835_AUX_SPI_CNTL1, bs->cntl[1]); + bcm2835aux_wr(bs, BCM2835_AUX_SPI_CNTL0, bs->cntl[0]); + + /* fill in tx fifo with data before enabling interrupts */ + while ((bs->tx_len) && + (bs->pending < 12) && + (!(bcm2835aux_rd(bs, BCM2835_AUX_SPI_STAT) & + BCM2835_AUX_SPI_STAT_TX_FULL))) { + bcm2835aux_wr_fifo(bs); + } + + /* now run the interrupt mode */ + return __bcm2835aux_spi_transfer_one_irq(master, spi, tfr); +} + +static int bcm2835aux_spi_transfer_one_poll(struct spi_master *master, + struct spi_device *spi, + struct spi_transfer *tfr) +{ + struct bcm2835aux_spi *bs = spi_master_get_devdata(master); + unsigned long timeout; + + /* update statistics */ + bs->count_transfer_polling++; + + /* configure spi */ + bcm2835aux_wr(bs, BCM2835_AUX_SPI_CNTL1, bs->cntl[1]); + bcm2835aux_wr(bs, BCM2835_AUX_SPI_CNTL0, bs->cntl[0]); + + /* set the timeout to at least 2 jiffies */ + timeout = jiffies + 2 + HZ * polling_limit_us / 1000000; + + /* loop until finished the transfer */ + while (bs->rx_len) { + + /* do common fifo handling */ + bcm2835aux_spi_transfer_helper(bs); + + /* there is still data pending to read check the timeout */ + if (bs->rx_len && time_after(jiffies, timeout)) { + dev_dbg_ratelimited(&spi->dev, + "timeout period reached: jiffies: %lu remaining tx/rx: %d/%d - falling back to interrupt mode\n", + jiffies - timeout, + bs->tx_len, bs->rx_len); + /* forward to interrupt handler */ + bs->count_transfer_irq_after_poll++; + return __bcm2835aux_spi_transfer_one_irq(master, + spi, tfr); + } + } + + /* and return without waiting for completion */ + return 0; +} + +static int bcm2835aux_spi_transfer_one(struct spi_master *master, + struct spi_device *spi, + struct spi_transfer *tfr) +{ + struct bcm2835aux_spi *bs = spi_master_get_devdata(master); + unsigned long spi_hz, clk_hz, speed; + unsigned long hz_per_byte, byte_limit; + + /* calculate the registers to handle + * + * note that we use the variable data mode, which + * is not optimal for longer transfers as we waste registers + * resulting (potentially) in more interrupts when transferring + * more than 12 bytes + */ + + /* set clock */ + spi_hz = tfr->speed_hz; + clk_hz = clk_get_rate(bs->clk); + + if (spi_hz >= clk_hz / 2) { + speed = 0; + } else if (spi_hz) { + speed = DIV_ROUND_UP(clk_hz, 2 * spi_hz) - 1; + if (speed > BCM2835_AUX_SPI_CNTL0_SPEED_MAX) + speed = BCM2835_AUX_SPI_CNTL0_SPEED_MAX; + } else { /* the slowest we can go */ + speed = BCM2835_AUX_SPI_CNTL0_SPEED_MAX; + } + /* mask out old speed from previous spi_transfer */ + bs->cntl[0] &= ~(BCM2835_AUX_SPI_CNTL0_SPEED); + /* set the new speed */ + bs->cntl[0] |= speed << BCM2835_AUX_SPI_CNTL0_SPEED_SHIFT; + + tfr->effective_speed_hz = clk_hz / (2 * (speed + 1)); + + /* set transmit buffers and length */ + bs->tx_buf = tfr->tx_buf; + bs->rx_buf = tfr->rx_buf; + bs->tx_len = tfr->len; + bs->rx_len = tfr->len; + bs->pending = 0; + + /* Calculate the estimated time in us the transfer runs. Note that + * there are are 2 idle clocks cycles after each chunk getting + * transferred - in our case the chunk size is 3 bytes, so we + * approximate this by 9 cycles/byte. This is used to find the number + * of Hz per byte per polling limit. E.g., we can transfer 1 byte in + * 30 µs per 300,000 Hz of bus clock. + */ + hz_per_byte = polling_limit_us ? (9 * 1000000) / polling_limit_us : 0; + byte_limit = hz_per_byte ? tfr->effective_speed_hz / hz_per_byte : 1; + + /* run in polling mode for short transfers */ + if (tfr->len < byte_limit) + return bcm2835aux_spi_transfer_one_poll(master, spi, tfr); + + /* run in interrupt mode for all others */ + return bcm2835aux_spi_transfer_one_irq(master, spi, tfr); +} + +static int bcm2835aux_spi_prepare_message(struct spi_master *master, + struct spi_message *msg) +{ + struct spi_device *spi = msg->spi; + struct bcm2835aux_spi *bs = spi_master_get_devdata(master); + + bs->cntl[0] = BCM2835_AUX_SPI_CNTL0_ENABLE | + BCM2835_AUX_SPI_CNTL0_VAR_WIDTH | + BCM2835_AUX_SPI_CNTL0_MSBF_OUT; + bs->cntl[1] = BCM2835_AUX_SPI_CNTL1_MSBF_IN; + + /* handle all the modes */ + if (spi->mode & SPI_CPOL) { + bs->cntl[0] |= BCM2835_AUX_SPI_CNTL0_CPOL; + bs->cntl[0] |= BCM2835_AUX_SPI_CNTL0_OUT_RISING; + } else { + bs->cntl[0] |= BCM2835_AUX_SPI_CNTL0_IN_RISING; + } + bcm2835aux_wr(bs, BCM2835_AUX_SPI_CNTL1, bs->cntl[1]); + bcm2835aux_wr(bs, BCM2835_AUX_SPI_CNTL0, bs->cntl[0]); + + return 0; +} + +static int bcm2835aux_spi_unprepare_message(struct spi_master *master, + struct spi_message *msg) +{ + struct bcm2835aux_spi *bs = spi_master_get_devdata(master); + + bcm2835aux_spi_reset_hw(bs); + + return 0; +} + +static void bcm2835aux_spi_handle_err(struct spi_master *master, + struct spi_message *msg) +{ + struct bcm2835aux_spi *bs = spi_master_get_devdata(master); + + bcm2835aux_spi_reset_hw(bs); +} + +static int bcm2835aux_spi_setup(struct spi_device *spi) +{ + int ret; + + /* sanity check for native cs */ + if (spi->mode & SPI_NO_CS) + return 0; + if (gpio_is_valid(spi->cs_gpio)) { + /* with gpio-cs set the GPIO to the correct level + * and as output (in case the dt has the gpio not configured + * as output but native cs) + */ + ret = gpio_direction_output(spi->cs_gpio, + (spi->mode & SPI_CS_HIGH) ? 0 : 1); + if (ret) + dev_err(&spi->dev, + "could not set gpio %i as output: %i\n", + spi->cs_gpio, ret); + + return ret; + } + + /* for dt-backwards compatibility: only support native on CS0 + * known things not supported with broken native CS: + * * multiple chip-selects: cs0-cs2 are all + * simultaniously asserted whenever there is a transfer + * this even includes SPI_NO_CS + * * SPI_CS_HIGH: cs are always asserted low + * * cs_change: cs is deasserted after each spi_transfer + * * cs_delay_usec: cs is always deasserted one SCK cycle + * after the last transfer + * probably more... + */ + dev_warn(&spi->dev, + "Native CS is not supported - please configure cs-gpio in device-tree\n"); + + if (spi->chip_select == 0) + return 0; + + dev_warn(&spi->dev, "Native CS is not working for cs > 0\n"); + + return -EINVAL; +} + +static int bcm2835aux_spi_probe(struct platform_device *pdev) +{ + struct spi_master *master; + struct bcm2835aux_spi *bs; + unsigned long clk_hz; + int err; + + master = devm_spi_alloc_master(&pdev->dev, sizeof(*bs)); + if (!master) + return -ENOMEM; + + platform_set_drvdata(pdev, master); + master->mode_bits = (SPI_CPOL | SPI_CS_HIGH | SPI_NO_CS); + master->bits_per_word_mask = SPI_BPW_MASK(8); + /* even though the driver never officially supported native CS + * allow a single native CS for legacy DT support purposes when + * no cs-gpio is configured. + * Known limitations for native cs are: + * * multiple chip-selects: cs0-cs2 are all simultaniously asserted + * whenever there is a transfer - this even includes SPI_NO_CS + * * SPI_CS_HIGH: is ignores - cs are always asserted low + * * cs_change: cs is deasserted after each spi_transfer + * * cs_delay_usec: cs is always deasserted one SCK cycle after + * a spi_transfer + */ + master->num_chipselect = 1; + master->setup = bcm2835aux_spi_setup; + master->transfer_one = bcm2835aux_spi_transfer_one; + master->handle_err = bcm2835aux_spi_handle_err; + master->prepare_message = bcm2835aux_spi_prepare_message; + master->unprepare_message = bcm2835aux_spi_unprepare_message; + master->dev.of_node = pdev->dev.of_node; + + bs = spi_master_get_devdata(master); + + /* the main area */ + bs->regs = devm_platform_ioremap_resource(pdev, 0); + if (IS_ERR(bs->regs)) + return PTR_ERR(bs->regs); + + bs->clk = devm_clk_get(&pdev->dev, NULL); + if (IS_ERR(bs->clk)) { + err = PTR_ERR(bs->clk); + dev_err(&pdev->dev, "could not get clk: %d\n", err); + return err; + } + + bs->irq = platform_get_irq(pdev, 0); + if (bs->irq <= 0) + return bs->irq ? bs->irq : -ENODEV; + + /* this also enables the HW block */ + err = clk_prepare_enable(bs->clk); + if (err) { + dev_err(&pdev->dev, "could not prepare clock: %d\n", err); + return err; + } + + /* just checking if the clock returns a sane value */ + clk_hz = clk_get_rate(bs->clk); + if (!clk_hz) { + dev_err(&pdev->dev, "clock returns 0 Hz\n"); + err = -ENODEV; + goto out_clk_disable; + } + + /* reset SPI-HW block */ + bcm2835aux_spi_reset_hw(bs); + + err = devm_request_irq(&pdev->dev, bs->irq, + bcm2835aux_spi_interrupt, + IRQF_SHARED, + dev_name(&pdev->dev), master); + if (err) { + dev_err(&pdev->dev, "could not request IRQ: %d\n", err); + goto out_clk_disable; + } + + err = spi_register_master(master); + if (err) { + dev_err(&pdev->dev, "could not register SPI master: %d\n", err); + goto out_clk_disable; + } + + bcm2835aux_debugfs_create(bs, dev_name(&pdev->dev)); + + return 0; + +out_clk_disable: + clk_disable_unprepare(bs->clk); + return err; +} + +static int bcm2835aux_spi_remove(struct platform_device *pdev) +{ + struct spi_master *master = platform_get_drvdata(pdev); + struct bcm2835aux_spi *bs = spi_master_get_devdata(master); + + bcm2835aux_debugfs_remove(bs); + + spi_unregister_master(master); + + bcm2835aux_spi_reset_hw(bs); + + /* disable the HW block by releasing the clock */ + clk_disable_unprepare(bs->clk); + + return 0; +} + +static const struct of_device_id bcm2835aux_spi_match[] = { + { .compatible = "brcm,bcm2835-aux-spi", }, + {} +}; +MODULE_DEVICE_TABLE(of, bcm2835aux_spi_match); + +static struct platform_driver bcm2835aux_spi_driver = { + .driver = { + .name = "spi-bcm2835aux", + .of_match_table = bcm2835aux_spi_match, + }, + .probe = bcm2835aux_spi_probe, + .remove = bcm2835aux_spi_remove, +}; +module_platform_driver(bcm2835aux_spi_driver); + +MODULE_DESCRIPTION("SPI controller driver for Broadcom BCM2835 aux"); +MODULE_AUTHOR("Martin Sperl <kernel@martin.sperl.org>"); +MODULE_LICENSE("GPL"); diff --git a/drivers/spi/spi-bcm63xx-hsspi.c b/drivers/spi/spi-bcm63xx-hsspi.c new file mode 100644 index 000000000..02f56fc00 --- /dev/null +++ b/drivers/spi/spi-bcm63xx-hsspi.c @@ -0,0 +1,544 @@ +/* + * Broadcom BCM63XX High Speed SPI Controller driver + * + * Copyright 2000-2010 Broadcom Corporation + * Copyright 2012-2013 Jonas Gorski <jogo@openwrt.org> + * + * Licensed under the GNU/GPL. See COPYING for details. + */ + +#include <linux/kernel.h> +#include <linux/init.h> +#include <linux/io.h> +#include <linux/clk.h> +#include <linux/module.h> +#include <linux/platform_device.h> +#include <linux/delay.h> +#include <linux/dma-mapping.h> +#include <linux/err.h> +#include <linux/interrupt.h> +#include <linux/spi/spi.h> +#include <linux/mutex.h> +#include <linux/of.h> +#include <linux/reset.h> +#include <linux/pm_runtime.h> + +#define HSSPI_GLOBAL_CTRL_REG 0x0 +#define GLOBAL_CTRL_CS_POLARITY_SHIFT 0 +#define GLOBAL_CTRL_CS_POLARITY_MASK 0x000000ff +#define GLOBAL_CTRL_PLL_CLK_CTRL_SHIFT 8 +#define GLOBAL_CTRL_PLL_CLK_CTRL_MASK 0x0000ff00 +#define GLOBAL_CTRL_CLK_GATE_SSOFF BIT(16) +#define GLOBAL_CTRL_CLK_POLARITY BIT(17) +#define GLOBAL_CTRL_MOSI_IDLE BIT(18) + +#define HSSPI_GLOBAL_EXT_TRIGGER_REG 0x4 + +#define HSSPI_INT_STATUS_REG 0x8 +#define HSSPI_INT_STATUS_MASKED_REG 0xc +#define HSSPI_INT_MASK_REG 0x10 + +#define HSSPI_PINGx_CMD_DONE(i) BIT((i * 8) + 0) +#define HSSPI_PINGx_RX_OVER(i) BIT((i * 8) + 1) +#define HSSPI_PINGx_TX_UNDER(i) BIT((i * 8) + 2) +#define HSSPI_PINGx_POLL_TIMEOUT(i) BIT((i * 8) + 3) +#define HSSPI_PINGx_CTRL_INVAL(i) BIT((i * 8) + 4) + +#define HSSPI_INT_CLEAR_ALL 0xff001f1f + +#define HSSPI_PINGPONG_COMMAND_REG(x) (0x80 + (x) * 0x40) +#define PINGPONG_CMD_COMMAND_MASK 0xf +#define PINGPONG_COMMAND_NOOP 0 +#define PINGPONG_COMMAND_START_NOW 1 +#define PINGPONG_COMMAND_START_TRIGGER 2 +#define PINGPONG_COMMAND_HALT 3 +#define PINGPONG_COMMAND_FLUSH 4 +#define PINGPONG_CMD_PROFILE_SHIFT 8 +#define PINGPONG_CMD_SS_SHIFT 12 + +#define HSSPI_PINGPONG_STATUS_REG(x) (0x84 + (x) * 0x40) + +#define HSSPI_PROFILE_CLK_CTRL_REG(x) (0x100 + (x) * 0x20) +#define CLK_CTRL_FREQ_CTRL_MASK 0x0000ffff +#define CLK_CTRL_SPI_CLK_2X_SEL BIT(14) +#define CLK_CTRL_ACCUM_RST_ON_LOOP BIT(15) + +#define HSSPI_PROFILE_SIGNAL_CTRL_REG(x) (0x104 + (x) * 0x20) +#define SIGNAL_CTRL_LATCH_RISING BIT(12) +#define SIGNAL_CTRL_LAUNCH_RISING BIT(13) +#define SIGNAL_CTRL_ASYNC_INPUT_PATH BIT(16) + +#define HSSPI_PROFILE_MODE_CTRL_REG(x) (0x108 + (x) * 0x20) +#define MODE_CTRL_MULTIDATA_RD_STRT_SHIFT 8 +#define MODE_CTRL_MULTIDATA_WR_STRT_SHIFT 12 +#define MODE_CTRL_MULTIDATA_RD_SIZE_SHIFT 16 +#define MODE_CTRL_MULTIDATA_WR_SIZE_SHIFT 18 +#define MODE_CTRL_MODE_3WIRE BIT(20) +#define MODE_CTRL_PREPENDBYTE_CNT_SHIFT 24 + +#define HSSPI_FIFO_REG(x) (0x200 + (x) * 0x200) + + +#define HSSPI_OP_MULTIBIT BIT(11) +#define HSSPI_OP_CODE_SHIFT 13 +#define HSSPI_OP_SLEEP (0 << HSSPI_OP_CODE_SHIFT) +#define HSSPI_OP_READ_WRITE (1 << HSSPI_OP_CODE_SHIFT) +#define HSSPI_OP_WRITE (2 << HSSPI_OP_CODE_SHIFT) +#define HSSPI_OP_READ (3 << HSSPI_OP_CODE_SHIFT) +#define HSSPI_OP_SETIRQ (4 << HSSPI_OP_CODE_SHIFT) + +#define HSSPI_BUFFER_LEN 512 +#define HSSPI_OPCODE_LEN 2 + +#define HSSPI_MAX_PREPEND_LEN 15 + +#define HSSPI_MAX_SYNC_CLOCK 30000000 + +#define HSSPI_SPI_MAX_CS 8 +#define HSSPI_BUS_NUM 1 /* 0 is legacy SPI */ + +struct bcm63xx_hsspi { + struct completion done; + struct mutex bus_mutex; + + struct platform_device *pdev; + struct clk *clk; + struct clk *pll_clk; + void __iomem *regs; + u8 __iomem *fifo; + + u32 speed_hz; + u8 cs_polarity; +}; + +static void bcm63xx_hsspi_set_cs(struct bcm63xx_hsspi *bs, unsigned int cs, + bool active) +{ + u32 reg; + + mutex_lock(&bs->bus_mutex); + reg = __raw_readl(bs->regs + HSSPI_GLOBAL_CTRL_REG); + + reg &= ~BIT(cs); + if (active == !(bs->cs_polarity & BIT(cs))) + reg |= BIT(cs); + + __raw_writel(reg, bs->regs + HSSPI_GLOBAL_CTRL_REG); + mutex_unlock(&bs->bus_mutex); +} + +static void bcm63xx_hsspi_set_clk(struct bcm63xx_hsspi *bs, + struct spi_device *spi, int hz) +{ + unsigned int profile = spi->chip_select; + u32 reg; + + reg = DIV_ROUND_UP(2048, DIV_ROUND_UP(bs->speed_hz, hz)); + __raw_writel(CLK_CTRL_ACCUM_RST_ON_LOOP | reg, + bs->regs + HSSPI_PROFILE_CLK_CTRL_REG(profile)); + + reg = __raw_readl(bs->regs + HSSPI_PROFILE_SIGNAL_CTRL_REG(profile)); + if (hz > HSSPI_MAX_SYNC_CLOCK) + reg |= SIGNAL_CTRL_ASYNC_INPUT_PATH; + else + reg &= ~SIGNAL_CTRL_ASYNC_INPUT_PATH; + __raw_writel(reg, bs->regs + HSSPI_PROFILE_SIGNAL_CTRL_REG(profile)); + + mutex_lock(&bs->bus_mutex); + /* setup clock polarity */ + reg = __raw_readl(bs->regs + HSSPI_GLOBAL_CTRL_REG); + reg &= ~GLOBAL_CTRL_CLK_POLARITY; + if (spi->mode & SPI_CPOL) + reg |= GLOBAL_CTRL_CLK_POLARITY; + __raw_writel(reg, bs->regs + HSSPI_GLOBAL_CTRL_REG); + mutex_unlock(&bs->bus_mutex); +} + +static int bcm63xx_hsspi_do_txrx(struct spi_device *spi, struct spi_transfer *t) +{ + struct bcm63xx_hsspi *bs = spi_master_get_devdata(spi->master); + unsigned int chip_select = spi->chip_select; + u16 opcode = 0; + int pending = t->len; + int step_size = HSSPI_BUFFER_LEN; + const u8 *tx = t->tx_buf; + u8 *rx = t->rx_buf; + u32 val = 0; + + bcm63xx_hsspi_set_clk(bs, spi, t->speed_hz); + bcm63xx_hsspi_set_cs(bs, spi->chip_select, true); + + if (tx && rx) + opcode = HSSPI_OP_READ_WRITE; + else if (tx) + opcode = HSSPI_OP_WRITE; + else if (rx) + opcode = HSSPI_OP_READ; + + if (opcode != HSSPI_OP_READ) + step_size -= HSSPI_OPCODE_LEN; + + if ((opcode == HSSPI_OP_READ && t->rx_nbits == SPI_NBITS_DUAL) || + (opcode == HSSPI_OP_WRITE && t->tx_nbits == SPI_NBITS_DUAL)) { + opcode |= HSSPI_OP_MULTIBIT; + + if (t->rx_nbits == SPI_NBITS_DUAL) + val |= 1 << MODE_CTRL_MULTIDATA_RD_SIZE_SHIFT; + if (t->tx_nbits == SPI_NBITS_DUAL) + val |= 1 << MODE_CTRL_MULTIDATA_WR_SIZE_SHIFT; + } + + __raw_writel(val | 0xff, + bs->regs + HSSPI_PROFILE_MODE_CTRL_REG(chip_select)); + + while (pending > 0) { + int curr_step = min_t(int, step_size, pending); + + reinit_completion(&bs->done); + if (tx) { + memcpy_toio(bs->fifo + HSSPI_OPCODE_LEN, tx, curr_step); + tx += curr_step; + } + + __raw_writew(opcode | curr_step, bs->fifo); + + /* enable interrupt */ + __raw_writel(HSSPI_PINGx_CMD_DONE(0), + bs->regs + HSSPI_INT_MASK_REG); + + /* start the transfer */ + __raw_writel(!chip_select << PINGPONG_CMD_SS_SHIFT | + chip_select << PINGPONG_CMD_PROFILE_SHIFT | + PINGPONG_COMMAND_START_NOW, + bs->regs + HSSPI_PINGPONG_COMMAND_REG(0)); + + if (wait_for_completion_timeout(&bs->done, HZ) == 0) { + dev_err(&bs->pdev->dev, "transfer timed out!\n"); + return -ETIMEDOUT; + } + + if (rx) { + memcpy_fromio(rx, bs->fifo, curr_step); + rx += curr_step; + } + + pending -= curr_step; + } + + return 0; +} + +static int bcm63xx_hsspi_setup(struct spi_device *spi) +{ + struct bcm63xx_hsspi *bs = spi_master_get_devdata(spi->master); + u32 reg; + + reg = __raw_readl(bs->regs + + HSSPI_PROFILE_SIGNAL_CTRL_REG(spi->chip_select)); + reg &= ~(SIGNAL_CTRL_LAUNCH_RISING | SIGNAL_CTRL_LATCH_RISING); + if (spi->mode & SPI_CPHA) + reg |= SIGNAL_CTRL_LAUNCH_RISING; + else + reg |= SIGNAL_CTRL_LATCH_RISING; + __raw_writel(reg, bs->regs + + HSSPI_PROFILE_SIGNAL_CTRL_REG(spi->chip_select)); + + mutex_lock(&bs->bus_mutex); + reg = __raw_readl(bs->regs + HSSPI_GLOBAL_CTRL_REG); + + /* only change actual polarities if there is no transfer */ + if ((reg & GLOBAL_CTRL_CS_POLARITY_MASK) == bs->cs_polarity) { + if (spi->mode & SPI_CS_HIGH) + reg |= BIT(spi->chip_select); + else + reg &= ~BIT(spi->chip_select); + __raw_writel(reg, bs->regs + HSSPI_GLOBAL_CTRL_REG); + } + + if (spi->mode & SPI_CS_HIGH) + bs->cs_polarity |= BIT(spi->chip_select); + else + bs->cs_polarity &= ~BIT(spi->chip_select); + + mutex_unlock(&bs->bus_mutex); + + return 0; +} + +static int bcm63xx_hsspi_transfer_one(struct spi_master *master, + struct spi_message *msg) +{ + struct bcm63xx_hsspi *bs = spi_master_get_devdata(master); + struct spi_transfer *t; + struct spi_device *spi = msg->spi; + int status = -EINVAL; + int dummy_cs; + u32 reg; + + /* This controller does not support keeping CS active during idle. + * To work around this, we use the following ugly hack: + * + * a. Invert the target chip select's polarity so it will be active. + * b. Select a "dummy" chip select to use as the hardware target. + * c. Invert the dummy chip select's polarity so it will be inactive + * during the actual transfers. + * d. Tell the hardware to send to the dummy chip select. Thanks to + * the multiplexed nature of SPI the actual target will receive + * the transfer and we see its response. + * + * e. At the end restore the polarities again to their default values. + */ + + dummy_cs = !spi->chip_select; + bcm63xx_hsspi_set_cs(bs, dummy_cs, true); + + list_for_each_entry(t, &msg->transfers, transfer_list) { + status = bcm63xx_hsspi_do_txrx(spi, t); + if (status) + break; + + msg->actual_length += t->len; + + spi_transfer_delay_exec(t); + + if (t->cs_change) + bcm63xx_hsspi_set_cs(bs, spi->chip_select, false); + } + + mutex_lock(&bs->bus_mutex); + reg = __raw_readl(bs->regs + HSSPI_GLOBAL_CTRL_REG); + reg &= ~GLOBAL_CTRL_CS_POLARITY_MASK; + reg |= bs->cs_polarity; + __raw_writel(reg, bs->regs + HSSPI_GLOBAL_CTRL_REG); + mutex_unlock(&bs->bus_mutex); + + msg->status = status; + spi_finalize_current_message(master); + + return 0; +} + +static irqreturn_t bcm63xx_hsspi_interrupt(int irq, void *dev_id) +{ + struct bcm63xx_hsspi *bs = (struct bcm63xx_hsspi *)dev_id; + + if (__raw_readl(bs->regs + HSSPI_INT_STATUS_MASKED_REG) == 0) + return IRQ_NONE; + + __raw_writel(HSSPI_INT_CLEAR_ALL, bs->regs + HSSPI_INT_STATUS_REG); + __raw_writel(0, bs->regs + HSSPI_INT_MASK_REG); + + complete(&bs->done); + + return IRQ_HANDLED; +} + +static int bcm63xx_hsspi_probe(struct platform_device *pdev) +{ + struct spi_master *master; + struct bcm63xx_hsspi *bs; + void __iomem *regs; + struct device *dev = &pdev->dev; + struct clk *clk, *pll_clk = NULL; + int irq, ret; + u32 reg, rate, num_cs = HSSPI_SPI_MAX_CS; + struct reset_control *reset; + + irq = platform_get_irq(pdev, 0); + if (irq < 0) + return irq; + + regs = devm_platform_ioremap_resource(pdev, 0); + if (IS_ERR(regs)) + return PTR_ERR(regs); + + clk = devm_clk_get(dev, "hsspi"); + + if (IS_ERR(clk)) + return PTR_ERR(clk); + + reset = devm_reset_control_get_optional_exclusive(dev, NULL); + if (IS_ERR(reset)) + return PTR_ERR(reset); + + ret = clk_prepare_enable(clk); + if (ret) + return ret; + + ret = reset_control_reset(reset); + if (ret) { + dev_err(dev, "unable to reset device: %d\n", ret); + goto out_disable_clk; + } + + rate = clk_get_rate(clk); + if (!rate) { + pll_clk = devm_clk_get(dev, "pll"); + + if (IS_ERR(pll_clk)) { + ret = PTR_ERR(pll_clk); + goto out_disable_clk; + } + + ret = clk_prepare_enable(pll_clk); + if (ret) + goto out_disable_clk; + + rate = clk_get_rate(pll_clk); + if (!rate) { + ret = -EINVAL; + goto out_disable_pll_clk; + } + } + + master = spi_alloc_master(&pdev->dev, sizeof(*bs)); + if (!master) { + ret = -ENOMEM; + goto out_disable_pll_clk; + } + + bs = spi_master_get_devdata(master); + bs->pdev = pdev; + bs->clk = clk; + bs->pll_clk = pll_clk; + bs->regs = regs; + bs->speed_hz = rate; + bs->fifo = (u8 __iomem *)(bs->regs + HSSPI_FIFO_REG(0)); + + mutex_init(&bs->bus_mutex); + init_completion(&bs->done); + + master->dev.of_node = dev->of_node; + if (!dev->of_node) + master->bus_num = HSSPI_BUS_NUM; + + of_property_read_u32(dev->of_node, "num-cs", &num_cs); + if (num_cs > 8) { + dev_warn(dev, "unsupported number of cs (%i), reducing to 8\n", + num_cs); + num_cs = HSSPI_SPI_MAX_CS; + } + master->num_chipselect = num_cs; + master->setup = bcm63xx_hsspi_setup; + master->transfer_one_message = bcm63xx_hsspi_transfer_one; + master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH | + SPI_RX_DUAL | SPI_TX_DUAL; + master->bits_per_word_mask = SPI_BPW_MASK(8); + master->auto_runtime_pm = true; + + platform_set_drvdata(pdev, master); + + /* Initialize the hardware */ + __raw_writel(0, bs->regs + HSSPI_INT_MASK_REG); + + /* clean up any pending interrupts */ + __raw_writel(HSSPI_INT_CLEAR_ALL, bs->regs + HSSPI_INT_STATUS_REG); + + /* read out default CS polarities */ + reg = __raw_readl(bs->regs + HSSPI_GLOBAL_CTRL_REG); + bs->cs_polarity = reg & GLOBAL_CTRL_CS_POLARITY_MASK; + __raw_writel(reg | GLOBAL_CTRL_CLK_GATE_SSOFF, + bs->regs + HSSPI_GLOBAL_CTRL_REG); + + ret = devm_request_irq(dev, irq, bcm63xx_hsspi_interrupt, IRQF_SHARED, + pdev->name, bs); + + if (ret) + goto out_put_master; + + pm_runtime_enable(&pdev->dev); + + /* register and we are done */ + ret = devm_spi_register_master(dev, master); + if (ret) + goto out_pm_disable; + + return 0; + +out_pm_disable: + pm_runtime_disable(&pdev->dev); +out_put_master: + spi_master_put(master); +out_disable_pll_clk: + clk_disable_unprepare(pll_clk); +out_disable_clk: + clk_disable_unprepare(clk); + return ret; +} + + +static int bcm63xx_hsspi_remove(struct platform_device *pdev) +{ + struct spi_master *master = platform_get_drvdata(pdev); + struct bcm63xx_hsspi *bs = spi_master_get_devdata(master); + + /* reset the hardware and block queue progress */ + __raw_writel(0, bs->regs + HSSPI_INT_MASK_REG); + clk_disable_unprepare(bs->pll_clk); + clk_disable_unprepare(bs->clk); + + return 0; +} + +#ifdef CONFIG_PM_SLEEP +static int bcm63xx_hsspi_suspend(struct device *dev) +{ + struct spi_master *master = dev_get_drvdata(dev); + struct bcm63xx_hsspi *bs = spi_master_get_devdata(master); + + spi_master_suspend(master); + clk_disable_unprepare(bs->pll_clk); + clk_disable_unprepare(bs->clk); + + return 0; +} + +static int bcm63xx_hsspi_resume(struct device *dev) +{ + struct spi_master *master = dev_get_drvdata(dev); + struct bcm63xx_hsspi *bs = spi_master_get_devdata(master); + int ret; + + ret = clk_prepare_enable(bs->clk); + if (ret) + return ret; + + if (bs->pll_clk) { + ret = clk_prepare_enable(bs->pll_clk); + if (ret) { + clk_disable_unprepare(bs->clk); + return ret; + } + } + + spi_master_resume(master); + + return 0; +} +#endif + +static SIMPLE_DEV_PM_OPS(bcm63xx_hsspi_pm_ops, bcm63xx_hsspi_suspend, + bcm63xx_hsspi_resume); + +static const struct of_device_id bcm63xx_hsspi_of_match[] = { + { .compatible = "brcm,bcm6328-hsspi", }, + { }, +}; +MODULE_DEVICE_TABLE(of, bcm63xx_hsspi_of_match); + +static struct platform_driver bcm63xx_hsspi_driver = { + .driver = { + .name = "bcm63xx-hsspi", + .pm = &bcm63xx_hsspi_pm_ops, + .of_match_table = bcm63xx_hsspi_of_match, + }, + .probe = bcm63xx_hsspi_probe, + .remove = bcm63xx_hsspi_remove, +}; + +module_platform_driver(bcm63xx_hsspi_driver); + +MODULE_ALIAS("platform:bcm63xx_hsspi"); +MODULE_DESCRIPTION("Broadcom BCM63xx High Speed SPI Controller driver"); +MODULE_AUTHOR("Jonas Gorski <jogo@openwrt.org>"); +MODULE_LICENSE("GPL"); diff --git a/drivers/spi/spi-bcm63xx.c b/drivers/spi/spi-bcm63xx.c new file mode 100644 index 000000000..d36384fef --- /dev/null +++ b/drivers/spi/spi-bcm63xx.c @@ -0,0 +1,679 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Broadcom BCM63xx SPI controller support + * + * Copyright (C) 2009-2012 Florian Fainelli <florian@openwrt.org> + * Copyright (C) 2010 Tanguy Bouzeloc <tanguy.bouzeloc@efixo.com> + */ + +#include <linux/kernel.h> +#include <linux/clk.h> +#include <linux/io.h> +#include <linux/module.h> +#include <linux/platform_device.h> +#include <linux/delay.h> +#include <linux/interrupt.h> +#include <linux/spi/spi.h> +#include <linux/completion.h> +#include <linux/err.h> +#include <linux/pm_runtime.h> +#include <linux/of.h> +#include <linux/reset.h> + +/* BCM 6338/6348 SPI core */ +#define SPI_6348_RSET_SIZE 64 +#define SPI_6348_CMD 0x00 /* 16-bits register */ +#define SPI_6348_INT_STATUS 0x02 +#define SPI_6348_INT_MASK_ST 0x03 +#define SPI_6348_INT_MASK 0x04 +#define SPI_6348_ST 0x05 +#define SPI_6348_CLK_CFG 0x06 +#define SPI_6348_FILL_BYTE 0x07 +#define SPI_6348_MSG_TAIL 0x09 +#define SPI_6348_RX_TAIL 0x0b +#define SPI_6348_MSG_CTL 0x40 /* 8-bits register */ +#define SPI_6348_MSG_CTL_WIDTH 8 +#define SPI_6348_MSG_DATA 0x41 +#define SPI_6348_MSG_DATA_SIZE 0x3f +#define SPI_6348_RX_DATA 0x80 +#define SPI_6348_RX_DATA_SIZE 0x3f + +/* BCM 3368/6358/6262/6368 SPI core */ +#define SPI_6358_RSET_SIZE 1804 +#define SPI_6358_MSG_CTL 0x00 /* 16-bits register */ +#define SPI_6358_MSG_CTL_WIDTH 16 +#define SPI_6358_MSG_DATA 0x02 +#define SPI_6358_MSG_DATA_SIZE 0x21e +#define SPI_6358_RX_DATA 0x400 +#define SPI_6358_RX_DATA_SIZE 0x220 +#define SPI_6358_CMD 0x700 /* 16-bits register */ +#define SPI_6358_INT_STATUS 0x702 +#define SPI_6358_INT_MASK_ST 0x703 +#define SPI_6358_INT_MASK 0x704 +#define SPI_6358_ST 0x705 +#define SPI_6358_CLK_CFG 0x706 +#define SPI_6358_FILL_BYTE 0x707 +#define SPI_6358_MSG_TAIL 0x709 +#define SPI_6358_RX_TAIL 0x70B + +/* Shared SPI definitions */ + +/* Message configuration */ +#define SPI_FD_RW 0x00 +#define SPI_HD_W 0x01 +#define SPI_HD_R 0x02 +#define SPI_BYTE_CNT_SHIFT 0 +#define SPI_6348_MSG_TYPE_SHIFT 6 +#define SPI_6358_MSG_TYPE_SHIFT 14 + +/* Command */ +#define SPI_CMD_NOOP 0x00 +#define SPI_CMD_SOFT_RESET 0x01 +#define SPI_CMD_HARD_RESET 0x02 +#define SPI_CMD_START_IMMEDIATE 0x03 +#define SPI_CMD_COMMAND_SHIFT 0 +#define SPI_CMD_COMMAND_MASK 0x000f +#define SPI_CMD_DEVICE_ID_SHIFT 4 +#define SPI_CMD_PREPEND_BYTE_CNT_SHIFT 8 +#define SPI_CMD_ONE_BYTE_SHIFT 11 +#define SPI_CMD_ONE_WIRE_SHIFT 12 +#define SPI_DEV_ID_0 0 +#define SPI_DEV_ID_1 1 +#define SPI_DEV_ID_2 2 +#define SPI_DEV_ID_3 3 + +/* Interrupt mask */ +#define SPI_INTR_CMD_DONE 0x01 +#define SPI_INTR_RX_OVERFLOW 0x02 +#define SPI_INTR_TX_UNDERFLOW 0x04 +#define SPI_INTR_TX_OVERFLOW 0x08 +#define SPI_INTR_RX_UNDERFLOW 0x10 +#define SPI_INTR_CLEAR_ALL 0x1f + +/* Status */ +#define SPI_RX_EMPTY 0x02 +#define SPI_CMD_BUSY 0x04 +#define SPI_SERIAL_BUSY 0x08 + +/* Clock configuration */ +#define SPI_CLK_20MHZ 0x00 +#define SPI_CLK_0_391MHZ 0x01 +#define SPI_CLK_0_781MHZ 0x02 /* default */ +#define SPI_CLK_1_563MHZ 0x03 +#define SPI_CLK_3_125MHZ 0x04 +#define SPI_CLK_6_250MHZ 0x05 +#define SPI_CLK_12_50MHZ 0x06 +#define SPI_CLK_MASK 0x07 +#define SPI_SSOFFTIME_MASK 0x38 +#define SPI_SSOFFTIME_SHIFT 3 +#define SPI_BYTE_SWAP 0x80 + +enum bcm63xx_regs_spi { + SPI_CMD, + SPI_INT_STATUS, + SPI_INT_MASK_ST, + SPI_INT_MASK, + SPI_ST, + SPI_CLK_CFG, + SPI_FILL_BYTE, + SPI_MSG_TAIL, + SPI_RX_TAIL, + SPI_MSG_CTL, + SPI_MSG_DATA, + SPI_RX_DATA, + SPI_MSG_TYPE_SHIFT, + SPI_MSG_CTL_WIDTH, + SPI_MSG_DATA_SIZE, +}; + +#define BCM63XX_SPI_MAX_PREPEND 7 + +#define BCM63XX_SPI_MAX_CS 8 +#define BCM63XX_SPI_BUS_NUM 0 + +struct bcm63xx_spi { + struct completion done; + + void __iomem *regs; + int irq; + + /* Platform data */ + const unsigned long *reg_offsets; + unsigned int fifo_size; + unsigned int msg_type_shift; + unsigned int msg_ctl_width; + + /* data iomem */ + u8 __iomem *tx_io; + const u8 __iomem *rx_io; + + struct clk *clk; + struct platform_device *pdev; +}; + +static inline u8 bcm_spi_readb(struct bcm63xx_spi *bs, + unsigned int offset) +{ + return readb(bs->regs + bs->reg_offsets[offset]); +} + +static inline u16 bcm_spi_readw(struct bcm63xx_spi *bs, + unsigned int offset) +{ +#ifdef CONFIG_CPU_BIG_ENDIAN + return ioread16be(bs->regs + bs->reg_offsets[offset]); +#else + return readw(bs->regs + bs->reg_offsets[offset]); +#endif +} + +static inline void bcm_spi_writeb(struct bcm63xx_spi *bs, + u8 value, unsigned int offset) +{ + writeb(value, bs->regs + bs->reg_offsets[offset]); +} + +static inline void bcm_spi_writew(struct bcm63xx_spi *bs, + u16 value, unsigned int offset) +{ +#ifdef CONFIG_CPU_BIG_ENDIAN + iowrite16be(value, bs->regs + bs->reg_offsets[offset]); +#else + writew(value, bs->regs + bs->reg_offsets[offset]); +#endif +} + +static const unsigned int bcm63xx_spi_freq_table[SPI_CLK_MASK][2] = { + { 20000000, SPI_CLK_20MHZ }, + { 12500000, SPI_CLK_12_50MHZ }, + { 6250000, SPI_CLK_6_250MHZ }, + { 3125000, SPI_CLK_3_125MHZ }, + { 1563000, SPI_CLK_1_563MHZ }, + { 781000, SPI_CLK_0_781MHZ }, + { 391000, SPI_CLK_0_391MHZ } +}; + +static void bcm63xx_spi_setup_transfer(struct spi_device *spi, + struct spi_transfer *t) +{ + struct bcm63xx_spi *bs = spi_master_get_devdata(spi->master); + u8 clk_cfg, reg; + int i; + + /* Default to lowest clock configuration */ + clk_cfg = SPI_CLK_0_391MHZ; + + /* Find the closest clock configuration */ + for (i = 0; i < SPI_CLK_MASK; i++) { + if (t->speed_hz >= bcm63xx_spi_freq_table[i][0]) { + clk_cfg = bcm63xx_spi_freq_table[i][1]; + break; + } + } + + /* clear existing clock configuration bits of the register */ + reg = bcm_spi_readb(bs, SPI_CLK_CFG); + reg &= ~SPI_CLK_MASK; + reg |= clk_cfg; + + bcm_spi_writeb(bs, reg, SPI_CLK_CFG); + dev_dbg(&spi->dev, "Setting clock register to %02x (hz %d)\n", + clk_cfg, t->speed_hz); +} + +/* the spi->mode bits understood by this driver: */ +#define MODEBITS (SPI_CPOL | SPI_CPHA) + +static int bcm63xx_txrx_bufs(struct spi_device *spi, struct spi_transfer *first, + unsigned int num_transfers) +{ + struct bcm63xx_spi *bs = spi_master_get_devdata(spi->master); + u16 msg_ctl; + u16 cmd; + unsigned int i, timeout = 0, prepend_len = 0, len = 0; + struct spi_transfer *t = first; + bool do_rx = false; + bool do_tx = false; + + /* Disable the CMD_DONE interrupt */ + bcm_spi_writeb(bs, 0, SPI_INT_MASK); + + dev_dbg(&spi->dev, "txrx: tx %p, rx %p, len %d\n", + t->tx_buf, t->rx_buf, t->len); + + if (num_transfers > 1 && t->tx_buf && t->len <= BCM63XX_SPI_MAX_PREPEND) + prepend_len = t->len; + + /* prepare the buffer */ + for (i = 0; i < num_transfers; i++) { + if (t->tx_buf) { + do_tx = true; + memcpy_toio(bs->tx_io + len, t->tx_buf, t->len); + + /* don't prepend more than one tx */ + if (t != first) + prepend_len = 0; + } + + if (t->rx_buf) { + do_rx = true; + /* prepend is half-duplex write only */ + if (t == first) + prepend_len = 0; + } + + len += t->len; + + t = list_entry(t->transfer_list.next, struct spi_transfer, + transfer_list); + } + + reinit_completion(&bs->done); + + /* Fill in the Message control register */ + msg_ctl = (len << SPI_BYTE_CNT_SHIFT); + + if (do_rx && do_tx && prepend_len == 0) + msg_ctl |= (SPI_FD_RW << bs->msg_type_shift); + else if (do_rx) + msg_ctl |= (SPI_HD_R << bs->msg_type_shift); + else if (do_tx) + msg_ctl |= (SPI_HD_W << bs->msg_type_shift); + + switch (bs->msg_ctl_width) { + case 8: + bcm_spi_writeb(bs, msg_ctl, SPI_MSG_CTL); + break; + case 16: + bcm_spi_writew(bs, msg_ctl, SPI_MSG_CTL); + break; + } + + /* Issue the transfer */ + cmd = SPI_CMD_START_IMMEDIATE; + cmd |= (prepend_len << SPI_CMD_PREPEND_BYTE_CNT_SHIFT); + cmd |= (spi->chip_select << SPI_CMD_DEVICE_ID_SHIFT); + bcm_spi_writew(bs, cmd, SPI_CMD); + + /* Enable the CMD_DONE interrupt */ + bcm_spi_writeb(bs, SPI_INTR_CMD_DONE, SPI_INT_MASK); + + timeout = wait_for_completion_timeout(&bs->done, HZ); + if (!timeout) + return -ETIMEDOUT; + + if (!do_rx) + return 0; + + len = 0; + t = first; + /* Read out all the data */ + for (i = 0; i < num_transfers; i++) { + if (t->rx_buf) + memcpy_fromio(t->rx_buf, bs->rx_io + len, t->len); + + if (t != first || prepend_len == 0) + len += t->len; + + t = list_entry(t->transfer_list.next, struct spi_transfer, + transfer_list); + } + + return 0; +} + +static int bcm63xx_spi_transfer_one(struct spi_master *master, + struct spi_message *m) +{ + struct bcm63xx_spi *bs = spi_master_get_devdata(master); + struct spi_transfer *t, *first = NULL; + struct spi_device *spi = m->spi; + int status = 0; + unsigned int n_transfers = 0, total_len = 0; + bool can_use_prepend = false; + + /* + * This SPI controller does not support keeping CS active after a + * transfer. + * Work around this by merging as many transfers we can into one big + * full-duplex transfers. + */ + list_for_each_entry(t, &m->transfers, transfer_list) { + if (!first) + first = t; + + n_transfers++; + total_len += t->len; + + if (n_transfers == 2 && !first->rx_buf && !t->tx_buf && + first->len <= BCM63XX_SPI_MAX_PREPEND) + can_use_prepend = true; + else if (can_use_prepend && t->tx_buf) + can_use_prepend = false; + + /* we can only transfer one fifo worth of data */ + if ((can_use_prepend && + total_len > (bs->fifo_size + BCM63XX_SPI_MAX_PREPEND)) || + (!can_use_prepend && total_len > bs->fifo_size)) { + dev_err(&spi->dev, "unable to do transfers larger than FIFO size (%i > %i)\n", + total_len, bs->fifo_size); + status = -EINVAL; + goto exit; + } + + /* all combined transfers have to have the same speed */ + if (t->speed_hz != first->speed_hz) { + dev_err(&spi->dev, "unable to change speed between transfers\n"); + status = -EINVAL; + goto exit; + } + + /* CS will be deasserted directly after transfer */ + if (t->delay_usecs || t->delay.value) { + dev_err(&spi->dev, "unable to keep CS asserted after transfer\n"); + status = -EINVAL; + goto exit; + } + + if (t->cs_change || + list_is_last(&t->transfer_list, &m->transfers)) { + /* configure adapter for a new transfer */ + bcm63xx_spi_setup_transfer(spi, first); + + /* send the data */ + status = bcm63xx_txrx_bufs(spi, first, n_transfers); + if (status) + goto exit; + + m->actual_length += total_len; + + first = NULL; + n_transfers = 0; + total_len = 0; + can_use_prepend = false; + } + } +exit: + m->status = status; + spi_finalize_current_message(master); + + return 0; +} + +/* This driver supports single master mode only. Hence + * CMD_DONE is the only interrupt we care about + */ +static irqreturn_t bcm63xx_spi_interrupt(int irq, void *dev_id) +{ + struct spi_master *master = (struct spi_master *)dev_id; + struct bcm63xx_spi *bs = spi_master_get_devdata(master); + u8 intr; + + /* Read interupts and clear them immediately */ + intr = bcm_spi_readb(bs, SPI_INT_STATUS); + bcm_spi_writeb(bs, SPI_INTR_CLEAR_ALL, SPI_INT_STATUS); + bcm_spi_writeb(bs, 0, SPI_INT_MASK); + + /* A transfer completed */ + if (intr & SPI_INTR_CMD_DONE) + complete(&bs->done); + + return IRQ_HANDLED; +} + +static size_t bcm63xx_spi_max_length(struct spi_device *spi) +{ + struct bcm63xx_spi *bs = spi_master_get_devdata(spi->master); + + return bs->fifo_size; +} + +static const unsigned long bcm6348_spi_reg_offsets[] = { + [SPI_CMD] = SPI_6348_CMD, + [SPI_INT_STATUS] = SPI_6348_INT_STATUS, + [SPI_INT_MASK_ST] = SPI_6348_INT_MASK_ST, + [SPI_INT_MASK] = SPI_6348_INT_MASK, + [SPI_ST] = SPI_6348_ST, + [SPI_CLK_CFG] = SPI_6348_CLK_CFG, + [SPI_FILL_BYTE] = SPI_6348_FILL_BYTE, + [SPI_MSG_TAIL] = SPI_6348_MSG_TAIL, + [SPI_RX_TAIL] = SPI_6348_RX_TAIL, + [SPI_MSG_CTL] = SPI_6348_MSG_CTL, + [SPI_MSG_DATA] = SPI_6348_MSG_DATA, + [SPI_RX_DATA] = SPI_6348_RX_DATA, + [SPI_MSG_TYPE_SHIFT] = SPI_6348_MSG_TYPE_SHIFT, + [SPI_MSG_CTL_WIDTH] = SPI_6348_MSG_CTL_WIDTH, + [SPI_MSG_DATA_SIZE] = SPI_6348_MSG_DATA_SIZE, +}; + +static const unsigned long bcm6358_spi_reg_offsets[] = { + [SPI_CMD] = SPI_6358_CMD, + [SPI_INT_STATUS] = SPI_6358_INT_STATUS, + [SPI_INT_MASK_ST] = SPI_6358_INT_MASK_ST, + [SPI_INT_MASK] = SPI_6358_INT_MASK, + [SPI_ST] = SPI_6358_ST, + [SPI_CLK_CFG] = SPI_6358_CLK_CFG, + [SPI_FILL_BYTE] = SPI_6358_FILL_BYTE, + [SPI_MSG_TAIL] = SPI_6358_MSG_TAIL, + [SPI_RX_TAIL] = SPI_6358_RX_TAIL, + [SPI_MSG_CTL] = SPI_6358_MSG_CTL, + [SPI_MSG_DATA] = SPI_6358_MSG_DATA, + [SPI_RX_DATA] = SPI_6358_RX_DATA, + [SPI_MSG_TYPE_SHIFT] = SPI_6358_MSG_TYPE_SHIFT, + [SPI_MSG_CTL_WIDTH] = SPI_6358_MSG_CTL_WIDTH, + [SPI_MSG_DATA_SIZE] = SPI_6358_MSG_DATA_SIZE, +}; + +static const struct platform_device_id bcm63xx_spi_dev_match[] = { + { + .name = "bcm6348-spi", + .driver_data = (unsigned long)bcm6348_spi_reg_offsets, + }, + { + .name = "bcm6358-spi", + .driver_data = (unsigned long)bcm6358_spi_reg_offsets, + }, + { + }, +}; + +static const struct of_device_id bcm63xx_spi_of_match[] = { + { .compatible = "brcm,bcm6348-spi", .data = &bcm6348_spi_reg_offsets }, + { .compatible = "brcm,bcm6358-spi", .data = &bcm6358_spi_reg_offsets }, + { }, +}; + +static int bcm63xx_spi_probe(struct platform_device *pdev) +{ + struct resource *r; + const unsigned long *bcm63xx_spireg; + struct device *dev = &pdev->dev; + int irq, bus_num; + struct spi_master *master; + struct clk *clk; + struct bcm63xx_spi *bs; + int ret; + u32 num_cs = BCM63XX_SPI_MAX_CS; + struct reset_control *reset; + + if (dev->of_node) { + const struct of_device_id *match; + + match = of_match_node(bcm63xx_spi_of_match, dev->of_node); + if (!match) + return -EINVAL; + bcm63xx_spireg = match->data; + + of_property_read_u32(dev->of_node, "num-cs", &num_cs); + if (num_cs > BCM63XX_SPI_MAX_CS) { + dev_warn(dev, "unsupported number of cs (%i), reducing to 8\n", + num_cs); + num_cs = BCM63XX_SPI_MAX_CS; + } + + bus_num = -1; + } else if (pdev->id_entry->driver_data) { + const struct platform_device_id *match = pdev->id_entry; + + bcm63xx_spireg = (const unsigned long *)match->driver_data; + bus_num = BCM63XX_SPI_BUS_NUM; + } else { + return -EINVAL; + } + + irq = platform_get_irq(pdev, 0); + if (irq < 0) + return irq; + + clk = devm_clk_get(dev, "spi"); + if (IS_ERR(clk)) { + dev_err(dev, "no clock for device\n"); + return PTR_ERR(clk); + } + + reset = devm_reset_control_get_optional_exclusive(dev, NULL); + if (IS_ERR(reset)) + return PTR_ERR(reset); + + master = spi_alloc_master(dev, sizeof(*bs)); + if (!master) { + dev_err(dev, "out of memory\n"); + return -ENOMEM; + } + + bs = spi_master_get_devdata(master); + init_completion(&bs->done); + + platform_set_drvdata(pdev, master); + bs->pdev = pdev; + + r = platform_get_resource(pdev, IORESOURCE_MEM, 0); + bs->regs = devm_ioremap_resource(&pdev->dev, r); + if (IS_ERR(bs->regs)) { + ret = PTR_ERR(bs->regs); + goto out_err; + } + + bs->irq = irq; + bs->clk = clk; + bs->reg_offsets = bcm63xx_spireg; + bs->fifo_size = bs->reg_offsets[SPI_MSG_DATA_SIZE]; + + ret = devm_request_irq(&pdev->dev, irq, bcm63xx_spi_interrupt, 0, + pdev->name, master); + if (ret) { + dev_err(dev, "unable to request irq\n"); + goto out_err; + } + + master->dev.of_node = dev->of_node; + master->bus_num = bus_num; + master->num_chipselect = num_cs; + master->transfer_one_message = bcm63xx_spi_transfer_one; + master->mode_bits = MODEBITS; + master->bits_per_word_mask = SPI_BPW_MASK(8); + master->max_transfer_size = bcm63xx_spi_max_length; + master->max_message_size = bcm63xx_spi_max_length; + master->auto_runtime_pm = true; + bs->msg_type_shift = bs->reg_offsets[SPI_MSG_TYPE_SHIFT]; + bs->msg_ctl_width = bs->reg_offsets[SPI_MSG_CTL_WIDTH]; + bs->tx_io = (u8 *)(bs->regs + bs->reg_offsets[SPI_MSG_DATA]); + bs->rx_io = (const u8 *)(bs->regs + bs->reg_offsets[SPI_RX_DATA]); + + /* Initialize hardware */ + ret = clk_prepare_enable(bs->clk); + if (ret) + goto out_err; + + ret = reset_control_reset(reset); + if (ret) { + dev_err(dev, "unable to reset device: %d\n", ret); + goto out_clk_disable; + } + + bcm_spi_writeb(bs, SPI_INTR_CLEAR_ALL, SPI_INT_STATUS); + + /* register and we are done */ + ret = devm_spi_register_master(dev, master); + if (ret) { + dev_err(dev, "spi register failed\n"); + goto out_clk_disable; + } + + dev_info(dev, "at %pr (irq %d, FIFOs size %d)\n", + r, irq, bs->fifo_size); + + return 0; + +out_clk_disable: + clk_disable_unprepare(clk); +out_err: + spi_master_put(master); + return ret; +} + +static int bcm63xx_spi_remove(struct platform_device *pdev) +{ + struct spi_master *master = platform_get_drvdata(pdev); + struct bcm63xx_spi *bs = spi_master_get_devdata(master); + + /* reset spi block */ + bcm_spi_writeb(bs, 0, SPI_INT_MASK); + + /* HW shutdown */ + clk_disable_unprepare(bs->clk); + + return 0; +} + +#ifdef CONFIG_PM_SLEEP +static int bcm63xx_spi_suspend(struct device *dev) +{ + struct spi_master *master = dev_get_drvdata(dev); + struct bcm63xx_spi *bs = spi_master_get_devdata(master); + + spi_master_suspend(master); + + clk_disable_unprepare(bs->clk); + + return 0; +} + +static int bcm63xx_spi_resume(struct device *dev) +{ + struct spi_master *master = dev_get_drvdata(dev); + struct bcm63xx_spi *bs = spi_master_get_devdata(master); + int ret; + + ret = clk_prepare_enable(bs->clk); + if (ret) + return ret; + + spi_master_resume(master); + + return 0; +} +#endif + +static const struct dev_pm_ops bcm63xx_spi_pm_ops = { + SET_SYSTEM_SLEEP_PM_OPS(bcm63xx_spi_suspend, bcm63xx_spi_resume) +}; + +static struct platform_driver bcm63xx_spi_driver = { + .driver = { + .name = "bcm63xx-spi", + .pm = &bcm63xx_spi_pm_ops, + .of_match_table = bcm63xx_spi_of_match, + }, + .id_table = bcm63xx_spi_dev_match, + .probe = bcm63xx_spi_probe, + .remove = bcm63xx_spi_remove, +}; + +module_platform_driver(bcm63xx_spi_driver); + +MODULE_ALIAS("platform:bcm63xx_spi"); +MODULE_AUTHOR("Florian Fainelli <florian@openwrt.org>"); +MODULE_AUTHOR("Tanguy Bouzeloc <tanguy.bouzeloc@efixo.com>"); +MODULE_DESCRIPTION("Broadcom BCM63xx SPI Controller driver"); +MODULE_LICENSE("GPL"); diff --git a/drivers/spi/spi-bitbang-txrx.h b/drivers/spi/spi-bitbang-txrx.h new file mode 100644 index 000000000..ae61d72c7 --- /dev/null +++ b/drivers/spi/spi-bitbang-txrx.h @@ -0,0 +1,108 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Mix this utility code with some glue code to get one of several types of + * simple SPI master driver. Two do polled word-at-a-time I/O: + * + * - GPIO/parport bitbangers. Provide chipselect() and txrx_word[](), + * expanding the per-word routines from the inline templates below. + * + * - Drivers for controllers resembling bare shift registers. Provide + * chipselect() and txrx_word[](), with custom setup()/cleanup() methods + * that use your controller's clock and chipselect registers. + * + * Some hardware works well with requests at spi_transfer scope: + * + * - Drivers leveraging smarter hardware, with fifos or DMA; or for half + * duplex (MicroWire) controllers. Provide chipselect() and txrx_bufs(), + * and custom setup()/cleanup() methods. + */ + +/* + * The code that knows what GPIO pins do what should have declared four + * functions, ideally as inlines, before including this header: + * + * void setsck(struct spi_device *, int is_on); + * void setmosi(struct spi_device *, int is_on); + * int getmiso(struct spi_device *); + * void spidelay(unsigned); + * + * setsck()'s is_on parameter is a zero/nonzero boolean. + * + * setmosi()'s is_on parameter is a zero/nonzero boolean. + * + * getmiso() is required to return 0 or 1 only. Any other value is invalid + * and will result in improper operation. + * + * A non-inlined routine would call bitbang_txrx_*() routines. The + * main loop could easily compile down to a handful of instructions, + * especially if the delay is a NOP (to run at peak speed). + * + * Since this is software, the timings may not be exactly what your board's + * chips need ... there may be several reasons you'd need to tweak timings + * in these routines, not just to make it faster or slower to match a + * particular CPU clock rate. + */ + +static inline u32 +bitbang_txrx_be_cpha0(struct spi_device *spi, + unsigned nsecs, unsigned cpol, unsigned flags, + u32 word, u8 bits) +{ + /* if (cpol == 0) this is SPI_MODE_0; else this is SPI_MODE_2 */ + + u32 oldbit = (!(word & (1<<(bits-1)))) << 31; + /* clock starts at inactive polarity */ + for (word <<= (32 - bits); likely(bits); bits--) { + + /* setup MSB (to slave) on trailing edge */ + if ((flags & SPI_MASTER_NO_TX) == 0) { + if ((word & (1 << 31)) != oldbit) { + setmosi(spi, word & (1 << 31)); + oldbit = word & (1 << 31); + } + } + spidelay(nsecs); /* T(setup) */ + + setsck(spi, !cpol); + spidelay(nsecs); + + /* sample MSB (from slave) on leading edge */ + word <<= 1; + if ((flags & SPI_MASTER_NO_RX) == 0) + word |= getmiso(spi); + setsck(spi, cpol); + } + return word; +} + +static inline u32 +bitbang_txrx_be_cpha1(struct spi_device *spi, + unsigned nsecs, unsigned cpol, unsigned flags, + u32 word, u8 bits) +{ + /* if (cpol == 0) this is SPI_MODE_1; else this is SPI_MODE_3 */ + + u32 oldbit = (!(word & (1<<(bits-1)))) << 31; + /* clock starts at inactive polarity */ + for (word <<= (32 - bits); likely(bits); bits--) { + + /* setup MSB (to slave) on leading edge */ + setsck(spi, !cpol); + if ((flags & SPI_MASTER_NO_TX) == 0) { + if ((word & (1 << 31)) != oldbit) { + setmosi(spi, word & (1 << 31)); + oldbit = word & (1 << 31); + } + } + spidelay(nsecs); /* T(setup) */ + + setsck(spi, cpol); + spidelay(nsecs); + + /* sample MSB (from slave) on trailing edge */ + word <<= 1; + if ((flags & SPI_MASTER_NO_RX) == 0) + word |= getmiso(spi); + } + return word; +} diff --git a/drivers/spi/spi-bitbang.c b/drivers/spi/spi-bitbang.c new file mode 100644 index 000000000..3d8948a17 --- /dev/null +++ b/drivers/spi/spi-bitbang.c @@ -0,0 +1,450 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * polling/bitbanging SPI master controller driver utilities + */ + +#include <linux/spinlock.h> +#include <linux/workqueue.h> +#include <linux/interrupt.h> +#include <linux/module.h> +#include <linux/delay.h> +#include <linux/errno.h> +#include <linux/platform_device.h> +#include <linux/slab.h> + +#include <linux/spi/spi.h> +#include <linux/spi/spi_bitbang.h> + +#define SPI_BITBANG_CS_DELAY 100 + + +/*----------------------------------------------------------------------*/ + +/* + * FIRST PART (OPTIONAL): word-at-a-time spi_transfer support. + * Use this for GPIO or shift-register level hardware APIs. + * + * spi_bitbang_cs is in spi_device->controller_state, which is unavailable + * to glue code. These bitbang setup() and cleanup() routines are always + * used, though maybe they're called from controller-aware code. + * + * chipselect() and friends may use spi_device->controller_data and + * controller registers as appropriate. + * + * + * NOTE: SPI controller pins can often be used as GPIO pins instead, + * which means you could use a bitbang driver either to get hardware + * working quickly, or testing for differences that aren't speed related. + */ + +struct spi_bitbang_cs { + unsigned nsecs; /* (clock cycle time)/2 */ + u32 (*txrx_word)(struct spi_device *spi, unsigned nsecs, + u32 word, u8 bits, unsigned flags); + unsigned (*txrx_bufs)(struct spi_device *, + u32 (*txrx_word)( + struct spi_device *spi, + unsigned nsecs, + u32 word, u8 bits, + unsigned flags), + unsigned, struct spi_transfer *, + unsigned); +}; + +static unsigned bitbang_txrx_8( + struct spi_device *spi, + u32 (*txrx_word)(struct spi_device *spi, + unsigned nsecs, + u32 word, u8 bits, + unsigned flags), + unsigned ns, + struct spi_transfer *t, + unsigned flags +) { + unsigned bits = t->bits_per_word; + unsigned count = t->len; + const u8 *tx = t->tx_buf; + u8 *rx = t->rx_buf; + + while (likely(count > 0)) { + u8 word = 0; + + if (tx) + word = *tx++; + word = txrx_word(spi, ns, word, bits, flags); + if (rx) + *rx++ = word; + count -= 1; + } + return t->len - count; +} + +static unsigned bitbang_txrx_16( + struct spi_device *spi, + u32 (*txrx_word)(struct spi_device *spi, + unsigned nsecs, + u32 word, u8 bits, + unsigned flags), + unsigned ns, + struct spi_transfer *t, + unsigned flags +) { + unsigned bits = t->bits_per_word; + unsigned count = t->len; + const u16 *tx = t->tx_buf; + u16 *rx = t->rx_buf; + + while (likely(count > 1)) { + u16 word = 0; + + if (tx) + word = *tx++; + word = txrx_word(spi, ns, word, bits, flags); + if (rx) + *rx++ = word; + count -= 2; + } + return t->len - count; +} + +static unsigned bitbang_txrx_32( + struct spi_device *spi, + u32 (*txrx_word)(struct spi_device *spi, + unsigned nsecs, + u32 word, u8 bits, + unsigned flags), + unsigned ns, + struct spi_transfer *t, + unsigned flags +) { + unsigned bits = t->bits_per_word; + unsigned count = t->len; + const u32 *tx = t->tx_buf; + u32 *rx = t->rx_buf; + + while (likely(count > 3)) { + u32 word = 0; + + if (tx) + word = *tx++; + word = txrx_word(spi, ns, word, bits, flags); + if (rx) + *rx++ = word; + count -= 4; + } + return t->len - count; +} + +int spi_bitbang_setup_transfer(struct spi_device *spi, struct spi_transfer *t) +{ + struct spi_bitbang_cs *cs = spi->controller_state; + u8 bits_per_word; + u32 hz; + + if (t) { + bits_per_word = t->bits_per_word; + hz = t->speed_hz; + } else { + bits_per_word = 0; + hz = 0; + } + + /* spi_transfer level calls that work per-word */ + if (!bits_per_word) + bits_per_word = spi->bits_per_word; + if (bits_per_word <= 8) + cs->txrx_bufs = bitbang_txrx_8; + else if (bits_per_word <= 16) + cs->txrx_bufs = bitbang_txrx_16; + else if (bits_per_word <= 32) + cs->txrx_bufs = bitbang_txrx_32; + else + return -EINVAL; + + /* nsecs = (clock period)/2 */ + if (!hz) + hz = spi->max_speed_hz; + if (hz) { + cs->nsecs = (1000000000/2) / hz; + if (cs->nsecs > (MAX_UDELAY_MS * 1000 * 1000)) + return -EINVAL; + } + + return 0; +} +EXPORT_SYMBOL_GPL(spi_bitbang_setup_transfer); + +/* + * spi_bitbang_setup - default setup for per-word I/O loops + */ +int spi_bitbang_setup(struct spi_device *spi) +{ + struct spi_bitbang_cs *cs = spi->controller_state; + struct spi_bitbang *bitbang; + bool initial_setup = false; + int retval; + + bitbang = spi_master_get_devdata(spi->master); + + if (!cs) { + cs = kzalloc(sizeof(*cs), GFP_KERNEL); + if (!cs) + return -ENOMEM; + spi->controller_state = cs; + initial_setup = true; + } + + /* per-word shift register access, in hardware or bitbanging */ + cs->txrx_word = bitbang->txrx_word[spi->mode & (SPI_CPOL|SPI_CPHA)]; + if (!cs->txrx_word) { + retval = -EINVAL; + goto err_free; + } + + if (bitbang->setup_transfer) { + retval = bitbang->setup_transfer(spi, NULL); + if (retval < 0) + goto err_free; + } + + dev_dbg(&spi->dev, "%s, %u nsec/bit\n", __func__, 2 * cs->nsecs); + + return 0; + +err_free: + if (initial_setup) + kfree(cs); + return retval; +} +EXPORT_SYMBOL_GPL(spi_bitbang_setup); + +/* + * spi_bitbang_cleanup - default cleanup for per-word I/O loops + */ +void spi_bitbang_cleanup(struct spi_device *spi) +{ + kfree(spi->controller_state); +} +EXPORT_SYMBOL_GPL(spi_bitbang_cleanup); + +static int spi_bitbang_bufs(struct spi_device *spi, struct spi_transfer *t) +{ + struct spi_bitbang_cs *cs = spi->controller_state; + unsigned nsecs = cs->nsecs; + struct spi_bitbang *bitbang; + + bitbang = spi_master_get_devdata(spi->master); + if (bitbang->set_line_direction) { + int err; + + err = bitbang->set_line_direction(spi, !!(t->tx_buf)); + if (err < 0) + return err; + } + + if (spi->mode & SPI_3WIRE) { + unsigned flags; + + flags = t->tx_buf ? SPI_MASTER_NO_RX : SPI_MASTER_NO_TX; + return cs->txrx_bufs(spi, cs->txrx_word, nsecs, t, flags); + } + return cs->txrx_bufs(spi, cs->txrx_word, nsecs, t, 0); +} + +/*----------------------------------------------------------------------*/ + +/* + * SECOND PART ... simple transfer queue runner. + * + * This costs a task context per controller, running the queue by + * performing each transfer in sequence. Smarter hardware can queue + * several DMA transfers at once, and process several controller queues + * in parallel; this driver doesn't match such hardware very well. + * + * Drivers can provide word-at-a-time i/o primitives, or provide + * transfer-at-a-time ones to leverage dma or fifo hardware. + */ + +static int spi_bitbang_prepare_hardware(struct spi_master *spi) +{ + struct spi_bitbang *bitbang; + + bitbang = spi_master_get_devdata(spi); + + mutex_lock(&bitbang->lock); + bitbang->busy = 1; + mutex_unlock(&bitbang->lock); + + return 0; +} + +static int spi_bitbang_transfer_one(struct spi_master *master, + struct spi_device *spi, + struct spi_transfer *transfer) +{ + struct spi_bitbang *bitbang = spi_master_get_devdata(master); + int status = 0; + + if (bitbang->setup_transfer) { + status = bitbang->setup_transfer(spi, transfer); + if (status < 0) + goto out; + } + + if (transfer->len) + status = bitbang->txrx_bufs(spi, transfer); + + if (status == transfer->len) + status = 0; + else if (status >= 0) + status = -EREMOTEIO; + +out: + spi_finalize_current_transfer(master); + + return status; +} + +static int spi_bitbang_unprepare_hardware(struct spi_master *spi) +{ + struct spi_bitbang *bitbang; + + bitbang = spi_master_get_devdata(spi); + + mutex_lock(&bitbang->lock); + bitbang->busy = 0; + mutex_unlock(&bitbang->lock); + + return 0; +} + +static void spi_bitbang_set_cs(struct spi_device *spi, bool enable) +{ + struct spi_bitbang *bitbang = spi_master_get_devdata(spi->master); + + /* SPI core provides CS high / low, but bitbang driver + * expects CS active + * spi device driver takes care of handling SPI_CS_HIGH + */ + enable = (!!(spi->mode & SPI_CS_HIGH) == enable); + + ndelay(SPI_BITBANG_CS_DELAY); + bitbang->chipselect(spi, enable ? BITBANG_CS_ACTIVE : + BITBANG_CS_INACTIVE); + ndelay(SPI_BITBANG_CS_DELAY); +} + +/*----------------------------------------------------------------------*/ + +int spi_bitbang_init(struct spi_bitbang *bitbang) +{ + struct spi_master *master = bitbang->master; + bool custom_cs; + + if (!master) + return -EINVAL; + /* + * We only need the chipselect callback if we are actually using it. + * If we just use GPIO descriptors, it is surplus. If the + * SPI_MASTER_GPIO_SS flag is set, we always need to call the + * driver-specific chipselect routine. + */ + custom_cs = (!master->use_gpio_descriptors || + (master->flags & SPI_MASTER_GPIO_SS)); + + if (custom_cs && !bitbang->chipselect) + return -EINVAL; + + mutex_init(&bitbang->lock); + + if (!master->mode_bits) + master->mode_bits = SPI_CPOL | SPI_CPHA | bitbang->flags; + + if (master->transfer || master->transfer_one_message) + return -EINVAL; + + master->prepare_transfer_hardware = spi_bitbang_prepare_hardware; + master->unprepare_transfer_hardware = spi_bitbang_unprepare_hardware; + master->transfer_one = spi_bitbang_transfer_one; + /* + * When using GPIO descriptors, the ->set_cs() callback doesn't even + * get called unless SPI_MASTER_GPIO_SS is set. + */ + if (custom_cs) + master->set_cs = spi_bitbang_set_cs; + + if (!bitbang->txrx_bufs) { + bitbang->use_dma = 0; + bitbang->txrx_bufs = spi_bitbang_bufs; + if (!master->setup) { + if (!bitbang->setup_transfer) + bitbang->setup_transfer = + spi_bitbang_setup_transfer; + master->setup = spi_bitbang_setup; + master->cleanup = spi_bitbang_cleanup; + } + } + + return 0; +} +EXPORT_SYMBOL_GPL(spi_bitbang_init); + +/** + * spi_bitbang_start - start up a polled/bitbanging SPI master driver + * @bitbang: driver handle + * + * Caller should have zero-initialized all parts of the structure, and then + * provided callbacks for chip selection and I/O loops. If the master has + * a transfer method, its final step should call spi_bitbang_transfer; or, + * that's the default if the transfer routine is not initialized. It should + * also set up the bus number and number of chipselects. + * + * For i/o loops, provide callbacks either per-word (for bitbanging, or for + * hardware that basically exposes a shift register) or per-spi_transfer + * (which takes better advantage of hardware like fifos or DMA engines). + * + * Drivers using per-word I/O loops should use (or call) spi_bitbang_setup, + * spi_bitbang_cleanup and spi_bitbang_setup_transfer to handle those spi + * master methods. Those methods are the defaults if the bitbang->txrx_bufs + * routine isn't initialized. + * + * This routine registers the spi_master, which will process requests in a + * dedicated task, keeping IRQs unblocked most of the time. To stop + * processing those requests, call spi_bitbang_stop(). + * + * On success, this routine will take a reference to master. The caller is + * responsible for calling spi_bitbang_stop() to decrement the reference and + * spi_master_put() as counterpart of spi_alloc_master() to prevent a memory + * leak. + */ +int spi_bitbang_start(struct spi_bitbang *bitbang) +{ + struct spi_master *master = bitbang->master; + int ret; + + ret = spi_bitbang_init(bitbang); + if (ret) + return ret; + + /* driver may get busy before register() returns, especially + * if someone registered boardinfo for devices + */ + ret = spi_register_master(spi_master_get(master)); + if (ret) + spi_master_put(master); + + return ret; +} +EXPORT_SYMBOL_GPL(spi_bitbang_start); + +/* + * spi_bitbang_stop - stops the task providing spi communication + */ +void spi_bitbang_stop(struct spi_bitbang *bitbang) +{ + spi_unregister_master(bitbang->master); +} +EXPORT_SYMBOL_GPL(spi_bitbang_stop); + +MODULE_LICENSE("GPL"); + diff --git a/drivers/spi/spi-brcmstb-qspi.c b/drivers/spi/spi-brcmstb-qspi.c new file mode 100644 index 000000000..75e9b76da --- /dev/null +++ b/drivers/spi/spi-brcmstb-qspi.c @@ -0,0 +1,42 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright 2016 Broadcom + */ + +#include <linux/device.h> +#include <linux/module.h> +#include <linux/platform_device.h> +#include <linux/of.h> +#include "spi-bcm-qspi.h" + +static const struct of_device_id brcmstb_qspi_of_match[] = { + { .compatible = "brcm,spi-brcmstb-qspi" }, + { .compatible = "brcm,spi-brcmstb-mspi" }, + {}, +}; +MODULE_DEVICE_TABLE(of, brcmstb_qspi_of_match); + +static int brcmstb_qspi_probe(struct platform_device *pdev) +{ + return bcm_qspi_probe(pdev, NULL); +} + +static int brcmstb_qspi_remove(struct platform_device *pdev) +{ + return bcm_qspi_remove(pdev); +} + +static struct platform_driver brcmstb_qspi_driver = { + .probe = brcmstb_qspi_probe, + .remove = brcmstb_qspi_remove, + .driver = { + .name = "brcmstb_qspi", + .pm = &bcm_qspi_pm_ops, + .of_match_table = brcmstb_qspi_of_match, + } +}; +module_platform_driver(brcmstb_qspi_driver); + +MODULE_LICENSE("GPL v2"); +MODULE_AUTHOR("Kamal Dasu"); +MODULE_DESCRIPTION("Broadcom SPI driver for settop SoC"); diff --git a/drivers/spi/spi-butterfly.c b/drivers/spi/spi-butterfly.c new file mode 100644 index 000000000..7e71a351f --- /dev/null +++ b/drivers/spi/spi-butterfly.c @@ -0,0 +1,334 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * parport-to-butterfly adapter + * + * Copyright (C) 2005 David Brownell + */ +#include <linux/kernel.h> +#include <linux/init.h> +#include <linux/delay.h> +#include <linux/module.h> +#include <linux/device.h> +#include <linux/parport.h> + +#include <linux/sched.h> +#include <linux/spi/spi.h> +#include <linux/spi/spi_bitbang.h> +#include <linux/spi/flash.h> + +#include <linux/mtd/partitions.h> + +/* + * This uses SPI to talk with an "AVR Butterfly", which is a $US20 card + * with a battery powered AVR microcontroller and lots of goodies. You + * can use GCC to develop firmware for this. + * + * See Documentation/spi/butterfly.rst for information about how to build + * and use this custom parallel port cable. + */ + +/* DATA output bits (pins 2..9 == D0..D7) */ +#define butterfly_nreset (1 << 1) /* pin 3 */ + +#define spi_sck_bit (1 << 0) /* pin 2 */ +#define spi_mosi_bit (1 << 7) /* pin 9 */ + +#define vcc_bits ((1 << 6) | (1 << 5)) /* pins 7, 8 */ + +/* STATUS input bits */ +#define spi_miso_bit PARPORT_STATUS_BUSY /* pin 11 */ + +/* CONTROL output bits */ +#define spi_cs_bit PARPORT_CONTROL_SELECT /* pin 17 */ + +static inline struct butterfly *spidev_to_pp(struct spi_device *spi) +{ + return spi->controller_data; +} + +struct butterfly { + /* REVISIT ... for now, this must be first */ + struct spi_bitbang bitbang; + + struct parport *port; + struct pardevice *pd; + + u8 lastbyte; + + struct spi_device *dataflash; + struct spi_device *butterfly; + struct spi_board_info info[2]; + +}; + +/*----------------------------------------------------------------------*/ + +static inline void +setsck(struct spi_device *spi, int is_on) +{ + struct butterfly *pp = spidev_to_pp(spi); + u8 bit, byte = pp->lastbyte; + + bit = spi_sck_bit; + + if (is_on) + byte |= bit; + else + byte &= ~bit; + parport_write_data(pp->port, byte); + pp->lastbyte = byte; +} + +static inline void +setmosi(struct spi_device *spi, int is_on) +{ + struct butterfly *pp = spidev_to_pp(spi); + u8 bit, byte = pp->lastbyte; + + bit = spi_mosi_bit; + + if (is_on) + byte |= bit; + else + byte &= ~bit; + parport_write_data(pp->port, byte); + pp->lastbyte = byte; +} + +static inline int getmiso(struct spi_device *spi) +{ + struct butterfly *pp = spidev_to_pp(spi); + int value; + u8 bit; + + bit = spi_miso_bit; + + /* only STATUS_BUSY is NOT negated */ + value = !(parport_read_status(pp->port) & bit); + return (bit == PARPORT_STATUS_BUSY) ? value : !value; +} + +static void butterfly_chipselect(struct spi_device *spi, int value) +{ + struct butterfly *pp = spidev_to_pp(spi); + + /* set default clock polarity */ + if (value != BITBANG_CS_INACTIVE) + setsck(spi, spi->mode & SPI_CPOL); + + /* here, value == "activate or not"; + * most PARPORT_CONTROL_* bits are negated, so we must + * morph it to value == "bit value to write in control register" + */ + if (spi_cs_bit == PARPORT_CONTROL_INIT) + value = !value; + + parport_frob_control(pp->port, spi_cs_bit, value ? spi_cs_bit : 0); +} + +/* we only needed to implement one mode here, and choose SPI_MODE_0 */ + +#define spidelay(X) do { } while (0) +/* #define spidelay ndelay */ + +#include "spi-bitbang-txrx.h" + +static u32 +butterfly_txrx_word_mode0(struct spi_device *spi, unsigned nsecs, u32 word, + u8 bits, unsigned flags) +{ + return bitbang_txrx_be_cpha0(spi, nsecs, 0, flags, word, bits); +} + +/*----------------------------------------------------------------------*/ + +/* override default partitioning with cmdlinepart */ +static struct mtd_partition partitions[] = { { + /* JFFS2 wants partitions of 4*N blocks for this device, + * so sectors 0 and 1 can't be partitions by themselves. + */ + + /* sector 0 = 8 pages * 264 bytes/page (1 block) + * sector 1 = 248 pages * 264 bytes/page + */ + .name = "bookkeeping", /* 66 KB */ + .offset = 0, + .size = (8 + 248) * 264, + /* .mask_flags = MTD_WRITEABLE, */ +}, { + /* sector 2 = 256 pages * 264 bytes/page + * sectors 3-5 = 512 pages * 264 bytes/page + */ + .name = "filesystem", /* 462 KB */ + .offset = MTDPART_OFS_APPEND, + .size = MTDPART_SIZ_FULL, +} }; + +static struct flash_platform_data flash = { + .name = "butterflash", + .parts = partitions, + .nr_parts = ARRAY_SIZE(partitions), +}; + +/* REVISIT remove this ugly global and its "only one" limitation */ +static struct butterfly *butterfly; + +static void butterfly_attach(struct parport *p) +{ + struct pardevice *pd; + int status; + struct butterfly *pp; + struct spi_master *master; + struct device *dev = p->physport->dev; + struct pardev_cb butterfly_cb; + + if (butterfly || !dev) + return; + + /* REVISIT: this just _assumes_ a butterfly is there ... no probe, + * and no way to be selective about what it binds to. + */ + + master = spi_alloc_master(dev, sizeof(*pp)); + if (!master) { + status = -ENOMEM; + goto done; + } + pp = spi_master_get_devdata(master); + + /* + * SPI and bitbang hookup + * + * use default setup(), cleanup(), and transfer() methods; and + * only bother implementing mode 0. Start it later. + */ + master->bus_num = 42; + master->num_chipselect = 2; + + pp->bitbang.master = master; + pp->bitbang.chipselect = butterfly_chipselect; + pp->bitbang.txrx_word[SPI_MODE_0] = butterfly_txrx_word_mode0; + + /* + * parport hookup + */ + pp->port = p; + memset(&butterfly_cb, 0, sizeof(butterfly_cb)); + butterfly_cb.private = pp; + pd = parport_register_dev_model(p, "spi_butterfly", &butterfly_cb, 0); + if (!pd) { + status = -ENOMEM; + goto clean0; + } + pp->pd = pd; + + status = parport_claim(pd); + if (status < 0) + goto clean1; + + /* + * Butterfly reset, powerup, run firmware + */ + pr_debug("%s: powerup/reset Butterfly\n", p->name); + + /* nCS for dataflash (this bit is inverted on output) */ + parport_frob_control(pp->port, spi_cs_bit, 0); + + /* stabilize power with chip in reset (nRESET), and + * spi_sck_bit clear (CPOL=0) + */ + pp->lastbyte |= vcc_bits; + parport_write_data(pp->port, pp->lastbyte); + msleep(5); + + /* take it out of reset; assume long reset delay */ + pp->lastbyte |= butterfly_nreset; + parport_write_data(pp->port, pp->lastbyte); + msleep(100); + + /* + * Start SPI ... for now, hide that we're two physical busses. + */ + status = spi_bitbang_start(&pp->bitbang); + if (status < 0) + goto clean2; + + /* Bus 1 lets us talk to at45db041b (firmware disables AVR SPI), AVR + * (firmware resets at45, acts as spi slave) or neither (we ignore + * both, AVR uses AT45). Here we expect firmware for the first option. + */ + + pp->info[0].max_speed_hz = 15 * 1000 * 1000; + strcpy(pp->info[0].modalias, "mtd_dataflash"); + pp->info[0].platform_data = &flash; + pp->info[0].chip_select = 1; + pp->info[0].controller_data = pp; + pp->dataflash = spi_new_device(pp->bitbang.master, &pp->info[0]); + if (pp->dataflash) + pr_debug("%s: dataflash at %s\n", p->name, + dev_name(&pp->dataflash->dev)); + + pr_info("%s: AVR Butterfly\n", p->name); + butterfly = pp; + return; + +clean2: + /* turn off VCC */ + parport_write_data(pp->port, 0); + + parport_release(pp->pd); +clean1: + parport_unregister_device(pd); +clean0: + spi_master_put(pp->bitbang.master); +done: + pr_debug("%s: butterfly probe, fail %d\n", p->name, status); +} + +static void butterfly_detach(struct parport *p) +{ + struct butterfly *pp; + + /* FIXME this global is ugly ... but, how to quickly get from + * the parport to the "struct butterfly" associated with it? + * "old school" driver-internal device lists? + */ + if (!butterfly || butterfly->port != p) + return; + pp = butterfly; + butterfly = NULL; + + /* stop() unregisters child devices too */ + spi_bitbang_stop(&pp->bitbang); + + /* turn off VCC */ + parport_write_data(pp->port, 0); + msleep(10); + + parport_release(pp->pd); + parport_unregister_device(pp->pd); + + spi_master_put(pp->bitbang.master); +} + +static struct parport_driver butterfly_driver = { + .name = "spi_butterfly", + .match_port = butterfly_attach, + .detach = butterfly_detach, + .devmodel = true, +}; + +static int __init butterfly_init(void) +{ + return parport_register_driver(&butterfly_driver); +} +device_initcall(butterfly_init); + +static void __exit butterfly_exit(void) +{ + parport_unregister_driver(&butterfly_driver); +} +module_exit(butterfly_exit); + +MODULE_DESCRIPTION("Parport Adapter driver for AVR Butterfly"); +MODULE_LICENSE("GPL"); diff --git a/drivers/spi/spi-cadence-quadspi.c b/drivers/spi/spi-cadence-quadspi.c new file mode 100644 index 000000000..23d50a19a --- /dev/null +++ b/drivers/spi/spi-cadence-quadspi.c @@ -0,0 +1,1443 @@ +// SPDX-License-Identifier: GPL-2.0-only +// +// Driver for Cadence QSPI Controller +// +// Copyright Altera Corporation (C) 2012-2014. All rights reserved. +// Copyright Intel Corporation (C) 2019-2020. All rights reserved. +// Copyright (C) 2020 Texas Instruments Incorporated - http://www.ti.com + +#include <linux/clk.h> +#include <linux/completion.h> +#include <linux/delay.h> +#include <linux/dma-mapping.h> +#include <linux/dmaengine.h> +#include <linux/err.h> +#include <linux/errno.h> +#include <linux/interrupt.h> +#include <linux/io.h> +#include <linux/iopoll.h> +#include <linux/jiffies.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/of_device.h> +#include <linux/of.h> +#include <linux/platform_device.h> +#include <linux/pm_runtime.h> +#include <linux/reset.h> +#include <linux/sched.h> +#include <linux/spi/spi.h> +#include <linux/spi/spi-mem.h> +#include <linux/timer.h> + +#define CQSPI_NAME "cadence-qspi" +#define CQSPI_MAX_CHIPSELECT 16 + +/* Quirks */ +#define CQSPI_NEEDS_WR_DELAY BIT(0) +#define CQSPI_DISABLE_DAC_MODE BIT(1) + +/* Capabilities */ +#define CQSPI_SUPPORTS_OCTAL BIT(0) + +struct cqspi_st; + +struct cqspi_flash_pdata { + struct cqspi_st *cqspi; + u32 clk_rate; + u32 read_delay; + u32 tshsl_ns; + u32 tsd2d_ns; + u32 tchsh_ns; + u32 tslch_ns; + u8 inst_width; + u8 addr_width; + u8 data_width; + u8 cs; +}; + +struct cqspi_st { + struct platform_device *pdev; + + struct clk *clk; + unsigned int sclk; + + void __iomem *iobase; + void __iomem *ahb_base; + resource_size_t ahb_size; + struct completion transfer_complete; + + struct dma_chan *rx_chan; + struct completion rx_dma_complete; + dma_addr_t mmap_phys_base; + + int current_cs; + unsigned long master_ref_clk_hz; + bool is_decoded_cs; + u32 fifo_depth; + u32 fifo_width; + bool rclk_en; + u32 trigger_address; + u32 wr_delay; + bool use_direct_mode; + struct cqspi_flash_pdata f_pdata[CQSPI_MAX_CHIPSELECT]; +}; + +struct cqspi_driver_platdata { + u32 hwcaps_mask; + u8 quirks; +}; + +/* Operation timeout value */ +#define CQSPI_TIMEOUT_MS 500 +#define CQSPI_READ_TIMEOUT_MS 10 + +/* Instruction type */ +#define CQSPI_INST_TYPE_SINGLE 0 +#define CQSPI_INST_TYPE_DUAL 1 +#define CQSPI_INST_TYPE_QUAD 2 +#define CQSPI_INST_TYPE_OCTAL 3 + +#define CQSPI_DUMMY_CLKS_PER_BYTE 8 +#define CQSPI_DUMMY_BYTES_MAX 4 +#define CQSPI_DUMMY_CLKS_MAX 31 + +#define CQSPI_STIG_DATA_LEN_MAX 8 + +/* Register map */ +#define CQSPI_REG_CONFIG 0x00 +#define CQSPI_REG_CONFIG_ENABLE_MASK BIT(0) +#define CQSPI_REG_CONFIG_ENB_DIR_ACC_CTRL BIT(7) +#define CQSPI_REG_CONFIG_DECODE_MASK BIT(9) +#define CQSPI_REG_CONFIG_CHIPSELECT_LSB 10 +#define CQSPI_REG_CONFIG_DMA_MASK BIT(15) +#define CQSPI_REG_CONFIG_BAUD_LSB 19 +#define CQSPI_REG_CONFIG_IDLE_LSB 31 +#define CQSPI_REG_CONFIG_CHIPSELECT_MASK 0xF +#define CQSPI_REG_CONFIG_BAUD_MASK 0xF + +#define CQSPI_REG_RD_INSTR 0x04 +#define CQSPI_REG_RD_INSTR_OPCODE_LSB 0 +#define CQSPI_REG_RD_INSTR_TYPE_INSTR_LSB 8 +#define CQSPI_REG_RD_INSTR_TYPE_ADDR_LSB 12 +#define CQSPI_REG_RD_INSTR_TYPE_DATA_LSB 16 +#define CQSPI_REG_RD_INSTR_MODE_EN_LSB 20 +#define CQSPI_REG_RD_INSTR_DUMMY_LSB 24 +#define CQSPI_REG_RD_INSTR_TYPE_INSTR_MASK 0x3 +#define CQSPI_REG_RD_INSTR_TYPE_ADDR_MASK 0x3 +#define CQSPI_REG_RD_INSTR_TYPE_DATA_MASK 0x3 +#define CQSPI_REG_RD_INSTR_DUMMY_MASK 0x1F + +#define CQSPI_REG_WR_INSTR 0x08 +#define CQSPI_REG_WR_INSTR_OPCODE_LSB 0 +#define CQSPI_REG_WR_INSTR_TYPE_ADDR_LSB 12 +#define CQSPI_REG_WR_INSTR_TYPE_DATA_LSB 16 + +#define CQSPI_REG_DELAY 0x0C +#define CQSPI_REG_DELAY_TSLCH_LSB 0 +#define CQSPI_REG_DELAY_TCHSH_LSB 8 +#define CQSPI_REG_DELAY_TSD2D_LSB 16 +#define CQSPI_REG_DELAY_TSHSL_LSB 24 +#define CQSPI_REG_DELAY_TSLCH_MASK 0xFF +#define CQSPI_REG_DELAY_TCHSH_MASK 0xFF +#define CQSPI_REG_DELAY_TSD2D_MASK 0xFF +#define CQSPI_REG_DELAY_TSHSL_MASK 0xFF + +#define CQSPI_REG_READCAPTURE 0x10 +#define CQSPI_REG_READCAPTURE_BYPASS_LSB 0 +#define CQSPI_REG_READCAPTURE_DELAY_LSB 1 +#define CQSPI_REG_READCAPTURE_DELAY_MASK 0xF + +#define CQSPI_REG_SIZE 0x14 +#define CQSPI_REG_SIZE_ADDRESS_LSB 0 +#define CQSPI_REG_SIZE_PAGE_LSB 4 +#define CQSPI_REG_SIZE_BLOCK_LSB 16 +#define CQSPI_REG_SIZE_ADDRESS_MASK 0xF +#define CQSPI_REG_SIZE_PAGE_MASK 0xFFF +#define CQSPI_REG_SIZE_BLOCK_MASK 0x3F + +#define CQSPI_REG_SRAMPARTITION 0x18 +#define CQSPI_REG_INDIRECTTRIGGER 0x1C + +#define CQSPI_REG_DMA 0x20 +#define CQSPI_REG_DMA_SINGLE_LSB 0 +#define CQSPI_REG_DMA_BURST_LSB 8 +#define CQSPI_REG_DMA_SINGLE_MASK 0xFF +#define CQSPI_REG_DMA_BURST_MASK 0xFF + +#define CQSPI_REG_REMAP 0x24 +#define CQSPI_REG_MODE_BIT 0x28 + +#define CQSPI_REG_SDRAMLEVEL 0x2C +#define CQSPI_REG_SDRAMLEVEL_RD_LSB 0 +#define CQSPI_REG_SDRAMLEVEL_WR_LSB 16 +#define CQSPI_REG_SDRAMLEVEL_RD_MASK 0xFFFF +#define CQSPI_REG_SDRAMLEVEL_WR_MASK 0xFFFF + +#define CQSPI_REG_IRQSTATUS 0x40 +#define CQSPI_REG_IRQMASK 0x44 + +#define CQSPI_REG_INDIRECTRD 0x60 +#define CQSPI_REG_INDIRECTRD_START_MASK BIT(0) +#define CQSPI_REG_INDIRECTRD_CANCEL_MASK BIT(1) +#define CQSPI_REG_INDIRECTRD_DONE_MASK BIT(5) + +#define CQSPI_REG_INDIRECTRDWATERMARK 0x64 +#define CQSPI_REG_INDIRECTRDSTARTADDR 0x68 +#define CQSPI_REG_INDIRECTRDBYTES 0x6C + +#define CQSPI_REG_CMDCTRL 0x90 +#define CQSPI_REG_CMDCTRL_EXECUTE_MASK BIT(0) +#define CQSPI_REG_CMDCTRL_INPROGRESS_MASK BIT(1) +#define CQSPI_REG_CMDCTRL_WR_BYTES_LSB 12 +#define CQSPI_REG_CMDCTRL_WR_EN_LSB 15 +#define CQSPI_REG_CMDCTRL_ADD_BYTES_LSB 16 +#define CQSPI_REG_CMDCTRL_ADDR_EN_LSB 19 +#define CQSPI_REG_CMDCTRL_RD_BYTES_LSB 20 +#define CQSPI_REG_CMDCTRL_RD_EN_LSB 23 +#define CQSPI_REG_CMDCTRL_OPCODE_LSB 24 +#define CQSPI_REG_CMDCTRL_WR_BYTES_MASK 0x7 +#define CQSPI_REG_CMDCTRL_ADD_BYTES_MASK 0x3 +#define CQSPI_REG_CMDCTRL_RD_BYTES_MASK 0x7 + +#define CQSPI_REG_INDIRECTWR 0x70 +#define CQSPI_REG_INDIRECTWR_START_MASK BIT(0) +#define CQSPI_REG_INDIRECTWR_CANCEL_MASK BIT(1) +#define CQSPI_REG_INDIRECTWR_DONE_MASK BIT(5) + +#define CQSPI_REG_INDIRECTWRWATERMARK 0x74 +#define CQSPI_REG_INDIRECTWRSTARTADDR 0x78 +#define CQSPI_REG_INDIRECTWRBYTES 0x7C + +#define CQSPI_REG_CMDADDRESS 0x94 +#define CQSPI_REG_CMDREADDATALOWER 0xA0 +#define CQSPI_REG_CMDREADDATAUPPER 0xA4 +#define CQSPI_REG_CMDWRITEDATALOWER 0xA8 +#define CQSPI_REG_CMDWRITEDATAUPPER 0xAC + +/* Interrupt status bits */ +#define CQSPI_REG_IRQ_MODE_ERR BIT(0) +#define CQSPI_REG_IRQ_UNDERFLOW BIT(1) +#define CQSPI_REG_IRQ_IND_COMP BIT(2) +#define CQSPI_REG_IRQ_IND_RD_REJECT BIT(3) +#define CQSPI_REG_IRQ_WR_PROTECTED_ERR BIT(4) +#define CQSPI_REG_IRQ_ILLEGAL_AHB_ERR BIT(5) +#define CQSPI_REG_IRQ_WATERMARK BIT(6) +#define CQSPI_REG_IRQ_IND_SRAM_FULL BIT(12) + +#define CQSPI_IRQ_MASK_RD (CQSPI_REG_IRQ_WATERMARK | \ + CQSPI_REG_IRQ_IND_SRAM_FULL | \ + CQSPI_REG_IRQ_IND_COMP) + +#define CQSPI_IRQ_MASK_WR (CQSPI_REG_IRQ_IND_COMP | \ + CQSPI_REG_IRQ_WATERMARK | \ + CQSPI_REG_IRQ_UNDERFLOW) + +#define CQSPI_IRQ_STATUS_MASK 0x1FFFF + +static int cqspi_wait_for_bit(void __iomem *reg, const u32 mask, bool clr) +{ + u32 val; + + return readl_relaxed_poll_timeout(reg, val, + (((clr ? ~val : val) & mask) == mask), + 10, CQSPI_TIMEOUT_MS * 1000); +} + +static bool cqspi_is_idle(struct cqspi_st *cqspi) +{ + u32 reg = readl(cqspi->iobase + CQSPI_REG_CONFIG); + + return reg & (1 << CQSPI_REG_CONFIG_IDLE_LSB); +} + +static u32 cqspi_get_rd_sram_level(struct cqspi_st *cqspi) +{ + u32 reg = readl(cqspi->iobase + CQSPI_REG_SDRAMLEVEL); + + reg >>= CQSPI_REG_SDRAMLEVEL_RD_LSB; + return reg & CQSPI_REG_SDRAMLEVEL_RD_MASK; +} + +static irqreturn_t cqspi_irq_handler(int this_irq, void *dev) +{ + struct cqspi_st *cqspi = dev; + unsigned int irq_status; + + /* Read interrupt status */ + irq_status = readl(cqspi->iobase + CQSPI_REG_IRQSTATUS); + + /* Clear interrupt */ + writel(irq_status, cqspi->iobase + CQSPI_REG_IRQSTATUS); + + irq_status &= CQSPI_IRQ_MASK_RD | CQSPI_IRQ_MASK_WR; + + if (irq_status) + complete(&cqspi->transfer_complete); + + return IRQ_HANDLED; +} + +static unsigned int cqspi_calc_rdreg(struct cqspi_flash_pdata *f_pdata) +{ + u32 rdreg = 0; + + rdreg |= f_pdata->inst_width << CQSPI_REG_RD_INSTR_TYPE_INSTR_LSB; + rdreg |= f_pdata->addr_width << CQSPI_REG_RD_INSTR_TYPE_ADDR_LSB; + rdreg |= f_pdata->data_width << CQSPI_REG_RD_INSTR_TYPE_DATA_LSB; + + return rdreg; +} + +static int cqspi_wait_idle(struct cqspi_st *cqspi) +{ + const unsigned int poll_idle_retry = 3; + unsigned int count = 0; + unsigned long timeout; + + timeout = jiffies + msecs_to_jiffies(CQSPI_TIMEOUT_MS); + while (1) { + /* + * Read few times in succession to ensure the controller + * is indeed idle, that is, the bit does not transition + * low again. + */ + if (cqspi_is_idle(cqspi)) + count++; + else + count = 0; + + if (count >= poll_idle_retry) + return 0; + + if (time_after(jiffies, timeout)) { + /* Timeout, in busy mode. */ + dev_err(&cqspi->pdev->dev, + "QSPI is still busy after %dms timeout.\n", + CQSPI_TIMEOUT_MS); + return -ETIMEDOUT; + } + + cpu_relax(); + } +} + +static int cqspi_exec_flash_cmd(struct cqspi_st *cqspi, unsigned int reg) +{ + void __iomem *reg_base = cqspi->iobase; + int ret; + + /* Write the CMDCTRL without start execution. */ + writel(reg, reg_base + CQSPI_REG_CMDCTRL); + /* Start execute */ + reg |= CQSPI_REG_CMDCTRL_EXECUTE_MASK; + writel(reg, reg_base + CQSPI_REG_CMDCTRL); + + /* Polling for completion. */ + ret = cqspi_wait_for_bit(reg_base + CQSPI_REG_CMDCTRL, + CQSPI_REG_CMDCTRL_INPROGRESS_MASK, 1); + if (ret) { + dev_err(&cqspi->pdev->dev, + "Flash command execution timed out.\n"); + return ret; + } + + /* Polling QSPI idle status. */ + return cqspi_wait_idle(cqspi); +} + +static int cqspi_command_read(struct cqspi_flash_pdata *f_pdata, + const struct spi_mem_op *op) +{ + struct cqspi_st *cqspi = f_pdata->cqspi; + void __iomem *reg_base = cqspi->iobase; + u8 *rxbuf = op->data.buf.in; + u8 opcode = op->cmd.opcode; + size_t n_rx = op->data.nbytes; + unsigned int rdreg; + unsigned int reg; + size_t read_len; + int status; + + if (!n_rx || n_rx > CQSPI_STIG_DATA_LEN_MAX || !rxbuf) { + dev_err(&cqspi->pdev->dev, + "Invalid input argument, len %zu rxbuf 0x%p\n", + n_rx, rxbuf); + return -EINVAL; + } + + reg = opcode << CQSPI_REG_CMDCTRL_OPCODE_LSB; + + rdreg = cqspi_calc_rdreg(f_pdata); + writel(rdreg, reg_base + CQSPI_REG_RD_INSTR); + + reg |= (0x1 << CQSPI_REG_CMDCTRL_RD_EN_LSB); + + /* 0 means 1 byte. */ + reg |= (((n_rx - 1) & CQSPI_REG_CMDCTRL_RD_BYTES_MASK) + << CQSPI_REG_CMDCTRL_RD_BYTES_LSB); + status = cqspi_exec_flash_cmd(cqspi, reg); + if (status) + return status; + + reg = readl(reg_base + CQSPI_REG_CMDREADDATALOWER); + + /* Put the read value into rx_buf */ + read_len = (n_rx > 4) ? 4 : n_rx; + memcpy(rxbuf, ®, read_len); + rxbuf += read_len; + + if (n_rx > 4) { + reg = readl(reg_base + CQSPI_REG_CMDREADDATAUPPER); + + read_len = n_rx - read_len; + memcpy(rxbuf, ®, read_len); + } + + return 0; +} + +static int cqspi_command_write(struct cqspi_flash_pdata *f_pdata, + const struct spi_mem_op *op) +{ + struct cqspi_st *cqspi = f_pdata->cqspi; + void __iomem *reg_base = cqspi->iobase; + const u8 opcode = op->cmd.opcode; + const u8 *txbuf = op->data.buf.out; + size_t n_tx = op->data.nbytes; + unsigned int reg; + unsigned int data; + size_t write_len; + + if (n_tx > CQSPI_STIG_DATA_LEN_MAX || (n_tx && !txbuf)) { + dev_err(&cqspi->pdev->dev, + "Invalid input argument, cmdlen %zu txbuf 0x%p\n", + n_tx, txbuf); + return -EINVAL; + } + + reg = opcode << CQSPI_REG_CMDCTRL_OPCODE_LSB; + + if (op->addr.nbytes) { + reg |= (0x1 << CQSPI_REG_CMDCTRL_ADDR_EN_LSB); + reg |= ((op->addr.nbytes - 1) & + CQSPI_REG_CMDCTRL_ADD_BYTES_MASK) + << CQSPI_REG_CMDCTRL_ADD_BYTES_LSB; + + writel(op->addr.val, reg_base + CQSPI_REG_CMDADDRESS); + } + + if (n_tx) { + reg |= (0x1 << CQSPI_REG_CMDCTRL_WR_EN_LSB); + reg |= ((n_tx - 1) & CQSPI_REG_CMDCTRL_WR_BYTES_MASK) + << CQSPI_REG_CMDCTRL_WR_BYTES_LSB; + data = 0; + write_len = (n_tx > 4) ? 4 : n_tx; + memcpy(&data, txbuf, write_len); + txbuf += write_len; + writel(data, reg_base + CQSPI_REG_CMDWRITEDATALOWER); + + if (n_tx > 4) { + data = 0; + write_len = n_tx - 4; + memcpy(&data, txbuf, write_len); + writel(data, reg_base + CQSPI_REG_CMDWRITEDATAUPPER); + } + } + + return cqspi_exec_flash_cmd(cqspi, reg); +} + +static int cqspi_read_setup(struct cqspi_flash_pdata *f_pdata, + const struct spi_mem_op *op) +{ + struct cqspi_st *cqspi = f_pdata->cqspi; + void __iomem *reg_base = cqspi->iobase; + unsigned int dummy_clk = 0; + unsigned int reg; + + reg = op->cmd.opcode << CQSPI_REG_RD_INSTR_OPCODE_LSB; + reg |= cqspi_calc_rdreg(f_pdata); + + /* Setup dummy clock cycles */ + dummy_clk = op->dummy.nbytes * 8; + if (dummy_clk > CQSPI_DUMMY_CLKS_MAX) + return -EOPNOTSUPP; + + if (dummy_clk) + reg |= (dummy_clk & CQSPI_REG_RD_INSTR_DUMMY_MASK) + << CQSPI_REG_RD_INSTR_DUMMY_LSB; + + writel(reg, reg_base + CQSPI_REG_RD_INSTR); + + /* Set address width */ + reg = readl(reg_base + CQSPI_REG_SIZE); + reg &= ~CQSPI_REG_SIZE_ADDRESS_MASK; + reg |= (op->addr.nbytes - 1); + writel(reg, reg_base + CQSPI_REG_SIZE); + return 0; +} + +static int cqspi_indirect_read_execute(struct cqspi_flash_pdata *f_pdata, + u8 *rxbuf, loff_t from_addr, + const size_t n_rx) +{ + struct cqspi_st *cqspi = f_pdata->cqspi; + struct device *dev = &cqspi->pdev->dev; + void __iomem *reg_base = cqspi->iobase; + void __iomem *ahb_base = cqspi->ahb_base; + unsigned int remaining = n_rx; + unsigned int mod_bytes = n_rx % 4; + unsigned int bytes_to_read = 0; + u8 *rxbuf_end = rxbuf + n_rx; + int ret = 0; + + writel(from_addr, reg_base + CQSPI_REG_INDIRECTRDSTARTADDR); + writel(remaining, reg_base + CQSPI_REG_INDIRECTRDBYTES); + + /* Clear all interrupts. */ + writel(CQSPI_IRQ_STATUS_MASK, reg_base + CQSPI_REG_IRQSTATUS); + + writel(CQSPI_IRQ_MASK_RD, reg_base + CQSPI_REG_IRQMASK); + + reinit_completion(&cqspi->transfer_complete); + writel(CQSPI_REG_INDIRECTRD_START_MASK, + reg_base + CQSPI_REG_INDIRECTRD); + + while (remaining > 0) { + if (!wait_for_completion_timeout(&cqspi->transfer_complete, + msecs_to_jiffies(CQSPI_READ_TIMEOUT_MS))) + ret = -ETIMEDOUT; + + bytes_to_read = cqspi_get_rd_sram_level(cqspi); + + if (ret && bytes_to_read == 0) { + dev_err(dev, "Indirect read timeout, no bytes\n"); + goto failrd; + } + + while (bytes_to_read != 0) { + unsigned int word_remain = round_down(remaining, 4); + + bytes_to_read *= cqspi->fifo_width; + bytes_to_read = bytes_to_read > remaining ? + remaining : bytes_to_read; + bytes_to_read = round_down(bytes_to_read, 4); + /* Read 4 byte word chunks then single bytes */ + if (bytes_to_read) { + ioread32_rep(ahb_base, rxbuf, + (bytes_to_read / 4)); + } else if (!word_remain && mod_bytes) { + unsigned int temp = ioread32(ahb_base); + + bytes_to_read = mod_bytes; + memcpy(rxbuf, &temp, min((unsigned int) + (rxbuf_end - rxbuf), + bytes_to_read)); + } + rxbuf += bytes_to_read; + remaining -= bytes_to_read; + bytes_to_read = cqspi_get_rd_sram_level(cqspi); + } + + if (remaining > 0) + reinit_completion(&cqspi->transfer_complete); + } + + /* Check indirect done status */ + ret = cqspi_wait_for_bit(reg_base + CQSPI_REG_INDIRECTRD, + CQSPI_REG_INDIRECTRD_DONE_MASK, 0); + if (ret) { + dev_err(dev, "Indirect read completion error (%i)\n", ret); + goto failrd; + } + + /* Disable interrupt */ + writel(0, reg_base + CQSPI_REG_IRQMASK); + + /* Clear indirect completion status */ + writel(CQSPI_REG_INDIRECTRD_DONE_MASK, reg_base + CQSPI_REG_INDIRECTRD); + + return 0; + +failrd: + /* Disable interrupt */ + writel(0, reg_base + CQSPI_REG_IRQMASK); + + /* Cancel the indirect read */ + writel(CQSPI_REG_INDIRECTWR_CANCEL_MASK, + reg_base + CQSPI_REG_INDIRECTRD); + return ret; +} + +static int cqspi_write_setup(struct cqspi_flash_pdata *f_pdata, + const struct spi_mem_op *op) +{ + unsigned int reg; + struct cqspi_st *cqspi = f_pdata->cqspi; + void __iomem *reg_base = cqspi->iobase; + + /* Set opcode. */ + reg = op->cmd.opcode << CQSPI_REG_WR_INSTR_OPCODE_LSB; + writel(reg, reg_base + CQSPI_REG_WR_INSTR); + reg = cqspi_calc_rdreg(f_pdata); + writel(reg, reg_base + CQSPI_REG_RD_INSTR); + + reg = readl(reg_base + CQSPI_REG_SIZE); + reg &= ~CQSPI_REG_SIZE_ADDRESS_MASK; + reg |= (op->addr.nbytes - 1); + writel(reg, reg_base + CQSPI_REG_SIZE); + return 0; +} + +static int cqspi_indirect_write_execute(struct cqspi_flash_pdata *f_pdata, + loff_t to_addr, const u8 *txbuf, + const size_t n_tx) +{ + struct cqspi_st *cqspi = f_pdata->cqspi; + struct device *dev = &cqspi->pdev->dev; + void __iomem *reg_base = cqspi->iobase; + unsigned int remaining = n_tx; + unsigned int write_bytes; + int ret; + + writel(to_addr, reg_base + CQSPI_REG_INDIRECTWRSTARTADDR); + writel(remaining, reg_base + CQSPI_REG_INDIRECTWRBYTES); + + /* Clear all interrupts. */ + writel(CQSPI_IRQ_STATUS_MASK, reg_base + CQSPI_REG_IRQSTATUS); + + writel(CQSPI_IRQ_MASK_WR, reg_base + CQSPI_REG_IRQMASK); + + reinit_completion(&cqspi->transfer_complete); + writel(CQSPI_REG_INDIRECTWR_START_MASK, + reg_base + CQSPI_REG_INDIRECTWR); + /* + * As per 66AK2G02 TRM SPRUHY8F section 11.15.5.3 Indirect Access + * Controller programming sequence, couple of cycles of + * QSPI_REF_CLK delay is required for the above bit to + * be internally synchronized by the QSPI module. Provide 5 + * cycles of delay. + */ + if (cqspi->wr_delay) + ndelay(cqspi->wr_delay); + + while (remaining > 0) { + size_t write_words, mod_bytes; + + write_bytes = remaining; + write_words = write_bytes / 4; + mod_bytes = write_bytes % 4; + /* Write 4 bytes at a time then single bytes. */ + if (write_words) { + iowrite32_rep(cqspi->ahb_base, txbuf, write_words); + txbuf += (write_words * 4); + } + if (mod_bytes) { + unsigned int temp = 0xFFFFFFFF; + + memcpy(&temp, txbuf, mod_bytes); + iowrite32(temp, cqspi->ahb_base); + txbuf += mod_bytes; + } + + if (!wait_for_completion_timeout(&cqspi->transfer_complete, + msecs_to_jiffies(CQSPI_TIMEOUT_MS))) { + dev_err(dev, "Indirect write timeout\n"); + ret = -ETIMEDOUT; + goto failwr; + } + + remaining -= write_bytes; + + if (remaining > 0) + reinit_completion(&cqspi->transfer_complete); + } + + /* Check indirect done status */ + ret = cqspi_wait_for_bit(reg_base + CQSPI_REG_INDIRECTWR, + CQSPI_REG_INDIRECTWR_DONE_MASK, 0); + if (ret) { + dev_err(dev, "Indirect write completion error (%i)\n", ret); + goto failwr; + } + + /* Disable interrupt. */ + writel(0, reg_base + CQSPI_REG_IRQMASK); + + /* Clear indirect completion status */ + writel(CQSPI_REG_INDIRECTWR_DONE_MASK, reg_base + CQSPI_REG_INDIRECTWR); + + cqspi_wait_idle(cqspi); + + return 0; + +failwr: + /* Disable interrupt. */ + writel(0, reg_base + CQSPI_REG_IRQMASK); + + /* Cancel the indirect write */ + writel(CQSPI_REG_INDIRECTWR_CANCEL_MASK, + reg_base + CQSPI_REG_INDIRECTWR); + return ret; +} + +static void cqspi_chipselect(struct cqspi_flash_pdata *f_pdata) +{ + struct cqspi_st *cqspi = f_pdata->cqspi; + void __iomem *reg_base = cqspi->iobase; + unsigned int chip_select = f_pdata->cs; + unsigned int reg; + + reg = readl(reg_base + CQSPI_REG_CONFIG); + if (cqspi->is_decoded_cs) { + reg |= CQSPI_REG_CONFIG_DECODE_MASK; + } else { + reg &= ~CQSPI_REG_CONFIG_DECODE_MASK; + + /* Convert CS if without decoder. + * CS0 to 4b'1110 + * CS1 to 4b'1101 + * CS2 to 4b'1011 + * CS3 to 4b'0111 + */ + chip_select = 0xF & ~(1 << chip_select); + } + + reg &= ~(CQSPI_REG_CONFIG_CHIPSELECT_MASK + << CQSPI_REG_CONFIG_CHIPSELECT_LSB); + reg |= (chip_select & CQSPI_REG_CONFIG_CHIPSELECT_MASK) + << CQSPI_REG_CONFIG_CHIPSELECT_LSB; + writel(reg, reg_base + CQSPI_REG_CONFIG); +} + +static unsigned int calculate_ticks_for_ns(const unsigned int ref_clk_hz, + const unsigned int ns_val) +{ + unsigned int ticks; + + ticks = ref_clk_hz / 1000; /* kHz */ + ticks = DIV_ROUND_UP(ticks * ns_val, 1000000); + + return ticks; +} + +static void cqspi_delay(struct cqspi_flash_pdata *f_pdata) +{ + struct cqspi_st *cqspi = f_pdata->cqspi; + void __iomem *iobase = cqspi->iobase; + const unsigned int ref_clk_hz = cqspi->master_ref_clk_hz; + unsigned int tshsl, tchsh, tslch, tsd2d; + unsigned int reg; + unsigned int tsclk; + + /* calculate the number of ref ticks for one sclk tick */ + tsclk = DIV_ROUND_UP(ref_clk_hz, cqspi->sclk); + + tshsl = calculate_ticks_for_ns(ref_clk_hz, f_pdata->tshsl_ns); + /* this particular value must be at least one sclk */ + if (tshsl < tsclk) + tshsl = tsclk; + + tchsh = calculate_ticks_for_ns(ref_clk_hz, f_pdata->tchsh_ns); + tslch = calculate_ticks_for_ns(ref_clk_hz, f_pdata->tslch_ns); + tsd2d = calculate_ticks_for_ns(ref_clk_hz, f_pdata->tsd2d_ns); + + reg = (tshsl & CQSPI_REG_DELAY_TSHSL_MASK) + << CQSPI_REG_DELAY_TSHSL_LSB; + reg |= (tchsh & CQSPI_REG_DELAY_TCHSH_MASK) + << CQSPI_REG_DELAY_TCHSH_LSB; + reg |= (tslch & CQSPI_REG_DELAY_TSLCH_MASK) + << CQSPI_REG_DELAY_TSLCH_LSB; + reg |= (tsd2d & CQSPI_REG_DELAY_TSD2D_MASK) + << CQSPI_REG_DELAY_TSD2D_LSB; + writel(reg, iobase + CQSPI_REG_DELAY); +} + +static void cqspi_config_baudrate_div(struct cqspi_st *cqspi) +{ + const unsigned int ref_clk_hz = cqspi->master_ref_clk_hz; + void __iomem *reg_base = cqspi->iobase; + u32 reg, div; + + /* Recalculate the baudrate divisor based on QSPI specification. */ + div = DIV_ROUND_UP(ref_clk_hz, 2 * cqspi->sclk) - 1; + + reg = readl(reg_base + CQSPI_REG_CONFIG); + reg &= ~(CQSPI_REG_CONFIG_BAUD_MASK << CQSPI_REG_CONFIG_BAUD_LSB); + reg |= (div & CQSPI_REG_CONFIG_BAUD_MASK) << CQSPI_REG_CONFIG_BAUD_LSB; + writel(reg, reg_base + CQSPI_REG_CONFIG); +} + +static void cqspi_readdata_capture(struct cqspi_st *cqspi, + const bool bypass, + const unsigned int delay) +{ + void __iomem *reg_base = cqspi->iobase; + unsigned int reg; + + reg = readl(reg_base + CQSPI_REG_READCAPTURE); + + if (bypass) + reg |= (1 << CQSPI_REG_READCAPTURE_BYPASS_LSB); + else + reg &= ~(1 << CQSPI_REG_READCAPTURE_BYPASS_LSB); + + reg &= ~(CQSPI_REG_READCAPTURE_DELAY_MASK + << CQSPI_REG_READCAPTURE_DELAY_LSB); + + reg |= (delay & CQSPI_REG_READCAPTURE_DELAY_MASK) + << CQSPI_REG_READCAPTURE_DELAY_LSB; + + writel(reg, reg_base + CQSPI_REG_READCAPTURE); +} + +static void cqspi_controller_enable(struct cqspi_st *cqspi, bool enable) +{ + void __iomem *reg_base = cqspi->iobase; + unsigned int reg; + + reg = readl(reg_base + CQSPI_REG_CONFIG); + + if (enable) + reg |= CQSPI_REG_CONFIG_ENABLE_MASK; + else + reg &= ~CQSPI_REG_CONFIG_ENABLE_MASK; + + writel(reg, reg_base + CQSPI_REG_CONFIG); +} + +static void cqspi_configure(struct cqspi_flash_pdata *f_pdata, + unsigned long sclk) +{ + struct cqspi_st *cqspi = f_pdata->cqspi; + int switch_cs = (cqspi->current_cs != f_pdata->cs); + int switch_ck = (cqspi->sclk != sclk); + + if (switch_cs || switch_ck) + cqspi_controller_enable(cqspi, 0); + + /* Switch chip select. */ + if (switch_cs) { + cqspi->current_cs = f_pdata->cs; + cqspi_chipselect(f_pdata); + } + + /* Setup baudrate divisor and delays */ + if (switch_ck) { + cqspi->sclk = sclk; + cqspi_config_baudrate_div(cqspi); + cqspi_delay(f_pdata); + cqspi_readdata_capture(cqspi, !cqspi->rclk_en, + f_pdata->read_delay); + } + + if (switch_cs || switch_ck) + cqspi_controller_enable(cqspi, 1); +} + +static int cqspi_set_protocol(struct cqspi_flash_pdata *f_pdata, + const struct spi_mem_op *op) +{ + f_pdata->inst_width = CQSPI_INST_TYPE_SINGLE; + f_pdata->addr_width = CQSPI_INST_TYPE_SINGLE; + f_pdata->data_width = CQSPI_INST_TYPE_SINGLE; + + if (op->data.dir == SPI_MEM_DATA_IN) { + switch (op->data.buswidth) { + case 1: + f_pdata->data_width = CQSPI_INST_TYPE_SINGLE; + break; + case 2: + f_pdata->data_width = CQSPI_INST_TYPE_DUAL; + break; + case 4: + f_pdata->data_width = CQSPI_INST_TYPE_QUAD; + break; + case 8: + f_pdata->data_width = CQSPI_INST_TYPE_OCTAL; + break; + default: + return -EINVAL; + } + } + + return 0; +} + +static ssize_t cqspi_write(struct cqspi_flash_pdata *f_pdata, + const struct spi_mem_op *op) +{ + struct cqspi_st *cqspi = f_pdata->cqspi; + loff_t to = op->addr.val; + size_t len = op->data.nbytes; + const u_char *buf = op->data.buf.out; + int ret; + + ret = cqspi_set_protocol(f_pdata, op); + if (ret) + return ret; + + ret = cqspi_write_setup(f_pdata, op); + if (ret) + return ret; + + if (cqspi->use_direct_mode && ((to + len) <= cqspi->ahb_size)) { + memcpy_toio(cqspi->ahb_base + to, buf, len); + return cqspi_wait_idle(cqspi); + } + + return cqspi_indirect_write_execute(f_pdata, to, buf, len); +} + +static void cqspi_rx_dma_callback(void *param) +{ + struct cqspi_st *cqspi = param; + + complete(&cqspi->rx_dma_complete); +} + +static int cqspi_direct_read_execute(struct cqspi_flash_pdata *f_pdata, + u_char *buf, loff_t from, size_t len) +{ + struct cqspi_st *cqspi = f_pdata->cqspi; + struct device *dev = &cqspi->pdev->dev; + enum dma_ctrl_flags flags = DMA_CTRL_ACK | DMA_PREP_INTERRUPT; + dma_addr_t dma_src = (dma_addr_t)cqspi->mmap_phys_base + from; + int ret = 0; + struct dma_async_tx_descriptor *tx; + dma_cookie_t cookie; + dma_addr_t dma_dst; + struct device *ddev; + + if (!cqspi->rx_chan || !virt_addr_valid(buf)) { + memcpy_fromio(buf, cqspi->ahb_base + from, len); + return 0; + } + + ddev = cqspi->rx_chan->device->dev; + dma_dst = dma_map_single(ddev, buf, len, DMA_FROM_DEVICE); + if (dma_mapping_error(ddev, dma_dst)) { + dev_err(dev, "dma mapping failed\n"); + return -ENOMEM; + } + tx = dmaengine_prep_dma_memcpy(cqspi->rx_chan, dma_dst, dma_src, + len, flags); + if (!tx) { + dev_err(dev, "device_prep_dma_memcpy error\n"); + ret = -EIO; + goto err_unmap; + } + + tx->callback = cqspi_rx_dma_callback; + tx->callback_param = cqspi; + cookie = tx->tx_submit(tx); + reinit_completion(&cqspi->rx_dma_complete); + + ret = dma_submit_error(cookie); + if (ret) { + dev_err(dev, "dma_submit_error %d\n", cookie); + ret = -EIO; + goto err_unmap; + } + + dma_async_issue_pending(cqspi->rx_chan); + if (!wait_for_completion_timeout(&cqspi->rx_dma_complete, + msecs_to_jiffies(len))) { + dmaengine_terminate_sync(cqspi->rx_chan); + dev_err(dev, "DMA wait_for_completion_timeout\n"); + ret = -ETIMEDOUT; + goto err_unmap; + } + +err_unmap: + dma_unmap_single(ddev, dma_dst, len, DMA_FROM_DEVICE); + + return ret; +} + +static ssize_t cqspi_read(struct cqspi_flash_pdata *f_pdata, + const struct spi_mem_op *op) +{ + struct cqspi_st *cqspi = f_pdata->cqspi; + loff_t from = op->addr.val; + size_t len = op->data.nbytes; + u_char *buf = op->data.buf.in; + int ret; + + ret = cqspi_set_protocol(f_pdata, op); + if (ret) + return ret; + + ret = cqspi_read_setup(f_pdata, op); + if (ret) + return ret; + + if (cqspi->use_direct_mode && ((from + len) <= cqspi->ahb_size)) + return cqspi_direct_read_execute(f_pdata, buf, from, len); + + return cqspi_indirect_read_execute(f_pdata, buf, from, len); +} + +static int cqspi_mem_process(struct spi_mem *mem, const struct spi_mem_op *op) +{ + struct cqspi_st *cqspi = spi_master_get_devdata(mem->spi->master); + struct cqspi_flash_pdata *f_pdata; + + f_pdata = &cqspi->f_pdata[mem->spi->chip_select]; + cqspi_configure(f_pdata, mem->spi->max_speed_hz); + + if (op->data.dir == SPI_MEM_DATA_IN && op->data.buf.in) { + if (!op->addr.nbytes) + return cqspi_command_read(f_pdata, op); + + return cqspi_read(f_pdata, op); + } + + if (!op->addr.nbytes || !op->data.buf.out) + return cqspi_command_write(f_pdata, op); + + return cqspi_write(f_pdata, op); +} + +static int cqspi_exec_mem_op(struct spi_mem *mem, const struct spi_mem_op *op) +{ + int ret; + + ret = cqspi_mem_process(mem, op); + if (ret) + dev_err(&mem->spi->dev, "operation failed with %d\n", ret); + + return ret; +} + +static int cqspi_of_get_flash_pdata(struct platform_device *pdev, + struct cqspi_flash_pdata *f_pdata, + struct device_node *np) +{ + if (of_property_read_u32(np, "cdns,read-delay", &f_pdata->read_delay)) { + dev_err(&pdev->dev, "couldn't determine read-delay\n"); + return -ENXIO; + } + + if (of_property_read_u32(np, "cdns,tshsl-ns", &f_pdata->tshsl_ns)) { + dev_err(&pdev->dev, "couldn't determine tshsl-ns\n"); + return -ENXIO; + } + + if (of_property_read_u32(np, "cdns,tsd2d-ns", &f_pdata->tsd2d_ns)) { + dev_err(&pdev->dev, "couldn't determine tsd2d-ns\n"); + return -ENXIO; + } + + if (of_property_read_u32(np, "cdns,tchsh-ns", &f_pdata->tchsh_ns)) { + dev_err(&pdev->dev, "couldn't determine tchsh-ns\n"); + return -ENXIO; + } + + if (of_property_read_u32(np, "cdns,tslch-ns", &f_pdata->tslch_ns)) { + dev_err(&pdev->dev, "couldn't determine tslch-ns\n"); + return -ENXIO; + } + + if (of_property_read_u32(np, "spi-max-frequency", &f_pdata->clk_rate)) { + dev_err(&pdev->dev, "couldn't determine spi-max-frequency\n"); + return -ENXIO; + } + + return 0; +} + +static int cqspi_of_get_pdata(struct cqspi_st *cqspi) +{ + struct device *dev = &cqspi->pdev->dev; + struct device_node *np = dev->of_node; + + cqspi->is_decoded_cs = of_property_read_bool(np, "cdns,is-decoded-cs"); + + if (of_property_read_u32(np, "cdns,fifo-depth", &cqspi->fifo_depth)) { + dev_err(dev, "couldn't determine fifo-depth\n"); + return -ENXIO; + } + + if (of_property_read_u32(np, "cdns,fifo-width", &cqspi->fifo_width)) { + dev_err(dev, "couldn't determine fifo-width\n"); + return -ENXIO; + } + + if (of_property_read_u32(np, "cdns,trigger-address", + &cqspi->trigger_address)) { + dev_err(dev, "couldn't determine trigger-address\n"); + return -ENXIO; + } + + cqspi->rclk_en = of_property_read_bool(np, "cdns,rclk-en"); + + return 0; +} + +static void cqspi_controller_init(struct cqspi_st *cqspi) +{ + u32 reg; + + cqspi_controller_enable(cqspi, 0); + + /* Configure the remap address register, no remap */ + writel(0, cqspi->iobase + CQSPI_REG_REMAP); + + /* Disable all interrupts. */ + writel(0, cqspi->iobase + CQSPI_REG_IRQMASK); + + /* Configure the SRAM split to 1:1 . */ + writel(cqspi->fifo_depth / 2, cqspi->iobase + CQSPI_REG_SRAMPARTITION); + + /* Load indirect trigger address. */ + writel(cqspi->trigger_address, + cqspi->iobase + CQSPI_REG_INDIRECTTRIGGER); + + /* Program read watermark -- 1/2 of the FIFO. */ + writel(cqspi->fifo_depth * cqspi->fifo_width / 2, + cqspi->iobase + CQSPI_REG_INDIRECTRDWATERMARK); + /* Program write watermark -- 1/8 of the FIFO. */ + writel(cqspi->fifo_depth * cqspi->fifo_width / 8, + cqspi->iobase + CQSPI_REG_INDIRECTWRWATERMARK); + + /* Enable Direct Access Controller */ + reg = readl(cqspi->iobase + CQSPI_REG_CONFIG); + reg |= CQSPI_REG_CONFIG_ENB_DIR_ACC_CTRL; + writel(reg, cqspi->iobase + CQSPI_REG_CONFIG); + + cqspi_controller_enable(cqspi, 1); +} + +static int cqspi_request_mmap_dma(struct cqspi_st *cqspi) +{ + dma_cap_mask_t mask; + + dma_cap_zero(mask); + dma_cap_set(DMA_MEMCPY, mask); + + cqspi->rx_chan = dma_request_chan_by_mask(&mask); + if (IS_ERR(cqspi->rx_chan)) { + int ret = PTR_ERR(cqspi->rx_chan); + cqspi->rx_chan = NULL; + return dev_err_probe(&cqspi->pdev->dev, ret, "No Rx DMA available\n"); + } + init_completion(&cqspi->rx_dma_complete); + + return 0; +} + +static const char *cqspi_get_name(struct spi_mem *mem) +{ + struct cqspi_st *cqspi = spi_master_get_devdata(mem->spi->master); + struct device *dev = &cqspi->pdev->dev; + + return devm_kasprintf(dev, GFP_KERNEL, "%s.%d", dev_name(dev), mem->spi->chip_select); +} + +static const struct spi_controller_mem_ops cqspi_mem_ops = { + .exec_op = cqspi_exec_mem_op, + .get_name = cqspi_get_name, +}; + +static int cqspi_setup_flash(struct cqspi_st *cqspi) +{ + struct platform_device *pdev = cqspi->pdev; + struct device *dev = &pdev->dev; + struct device_node *np = dev->of_node; + struct cqspi_flash_pdata *f_pdata; + unsigned int cs; + int ret; + + /* Get flash device data */ + for_each_available_child_of_node(dev->of_node, np) { + ret = of_property_read_u32(np, "reg", &cs); + if (ret) { + dev_err(dev, "Couldn't determine chip select.\n"); + return ret; + } + + if (cs >= CQSPI_MAX_CHIPSELECT) { + dev_err(dev, "Chip select %d out of range.\n", cs); + return -EINVAL; + } + + f_pdata = &cqspi->f_pdata[cs]; + f_pdata->cqspi = cqspi; + f_pdata->cs = cs; + + ret = cqspi_of_get_flash_pdata(pdev, f_pdata, np); + if (ret) + return ret; + } + + return 0; +} + +static int cqspi_probe(struct platform_device *pdev) +{ + const struct cqspi_driver_platdata *ddata; + struct reset_control *rstc, *rstc_ocp; + struct device *dev = &pdev->dev; + struct spi_master *master; + struct resource *res_ahb; + struct cqspi_st *cqspi; + struct resource *res; + int ret; + int irq; + + master = spi_alloc_master(&pdev->dev, sizeof(*cqspi)); + if (!master) { + dev_err(&pdev->dev, "spi_alloc_master failed\n"); + return -ENOMEM; + } + master->mode_bits = SPI_RX_QUAD | SPI_RX_DUAL; + master->mem_ops = &cqspi_mem_ops; + master->dev.of_node = pdev->dev.of_node; + + cqspi = spi_master_get_devdata(master); + + cqspi->pdev = pdev; + platform_set_drvdata(pdev, cqspi); + + /* Obtain configuration from OF. */ + ret = cqspi_of_get_pdata(cqspi); + if (ret) { + dev_err(dev, "Cannot get mandatory OF data.\n"); + ret = -ENODEV; + goto probe_master_put; + } + + /* Obtain QSPI clock. */ + cqspi->clk = devm_clk_get(dev, NULL); + if (IS_ERR(cqspi->clk)) { + dev_err(dev, "Cannot claim QSPI clock.\n"); + ret = PTR_ERR(cqspi->clk); + goto probe_master_put; + } + + /* Obtain and remap controller address. */ + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + cqspi->iobase = devm_ioremap_resource(dev, res); + if (IS_ERR(cqspi->iobase)) { + dev_err(dev, "Cannot remap controller address.\n"); + ret = PTR_ERR(cqspi->iobase); + goto probe_master_put; + } + + /* Obtain and remap AHB address. */ + res_ahb = platform_get_resource(pdev, IORESOURCE_MEM, 1); + cqspi->ahb_base = devm_ioremap_resource(dev, res_ahb); + if (IS_ERR(cqspi->ahb_base)) { + dev_err(dev, "Cannot remap AHB address.\n"); + ret = PTR_ERR(cqspi->ahb_base); + goto probe_master_put; + } + cqspi->mmap_phys_base = (dma_addr_t)res_ahb->start; + cqspi->ahb_size = resource_size(res_ahb); + + init_completion(&cqspi->transfer_complete); + + /* Obtain IRQ line. */ + irq = platform_get_irq(pdev, 0); + if (irq < 0) { + ret = -ENXIO; + goto probe_master_put; + } + + pm_runtime_enable(dev); + ret = pm_runtime_get_sync(dev); + if (ret < 0) { + pm_runtime_put_noidle(dev); + goto probe_master_put; + } + + ret = clk_prepare_enable(cqspi->clk); + if (ret) { + dev_err(dev, "Cannot enable QSPI clock.\n"); + goto probe_clk_failed; + } + + /* Obtain QSPI reset control */ + rstc = devm_reset_control_get_optional_exclusive(dev, "qspi"); + if (IS_ERR(rstc)) { + ret = PTR_ERR(rstc); + dev_err(dev, "Cannot get QSPI reset.\n"); + goto probe_reset_failed; + } + + rstc_ocp = devm_reset_control_get_optional_exclusive(dev, "qspi-ocp"); + if (IS_ERR(rstc_ocp)) { + ret = PTR_ERR(rstc_ocp); + dev_err(dev, "Cannot get QSPI OCP reset.\n"); + goto probe_reset_failed; + } + + reset_control_assert(rstc); + reset_control_deassert(rstc); + + reset_control_assert(rstc_ocp); + reset_control_deassert(rstc_ocp); + + cqspi->master_ref_clk_hz = clk_get_rate(cqspi->clk); + ddata = of_device_get_match_data(dev); + if (ddata) { + if (ddata->quirks & CQSPI_NEEDS_WR_DELAY) + cqspi->wr_delay = 5 * DIV_ROUND_UP(NSEC_PER_SEC, + cqspi->master_ref_clk_hz); + if (ddata->hwcaps_mask & CQSPI_SUPPORTS_OCTAL) + master->mode_bits |= SPI_RX_OCTAL; + if (!(ddata->quirks & CQSPI_DISABLE_DAC_MODE)) + cqspi->use_direct_mode = true; + } + + ret = devm_request_irq(dev, irq, cqspi_irq_handler, 0, + pdev->name, cqspi); + if (ret) { + dev_err(dev, "Cannot request IRQ.\n"); + goto probe_reset_failed; + } + + cqspi_wait_idle(cqspi); + cqspi_controller_init(cqspi); + cqspi->current_cs = -1; + cqspi->sclk = 0; + + ret = cqspi_setup_flash(cqspi); + if (ret) { + dev_err(dev, "failed to setup flash parameters %d\n", ret); + goto probe_setup_failed; + } + + if (cqspi->use_direct_mode) { + ret = cqspi_request_mmap_dma(cqspi); + if (ret == -EPROBE_DEFER) + goto probe_setup_failed; + } + + ret = devm_spi_register_master(dev, master); + if (ret) { + dev_err(&pdev->dev, "failed to register SPI ctlr %d\n", ret); + goto probe_setup_failed; + } + + return 0; +probe_setup_failed: + cqspi_controller_enable(cqspi, 0); +probe_reset_failed: + clk_disable_unprepare(cqspi->clk); +probe_clk_failed: + pm_runtime_put_sync(dev); + pm_runtime_disable(dev); +probe_master_put: + spi_master_put(master); + return ret; +} + +static int cqspi_remove(struct platform_device *pdev) +{ + struct cqspi_st *cqspi = platform_get_drvdata(pdev); + + cqspi_controller_enable(cqspi, 0); + + if (cqspi->rx_chan) + dma_release_channel(cqspi->rx_chan); + + clk_disable_unprepare(cqspi->clk); + + pm_runtime_put_sync(&pdev->dev); + pm_runtime_disable(&pdev->dev); + + return 0; +} + +#ifdef CONFIG_PM_SLEEP +static int cqspi_suspend(struct device *dev) +{ + struct cqspi_st *cqspi = dev_get_drvdata(dev); + struct spi_master *master = dev_get_drvdata(dev); + int ret; + + ret = spi_master_suspend(master); + cqspi_controller_enable(cqspi, 0); + + clk_disable_unprepare(cqspi->clk); + + return ret; +} + +static int cqspi_resume(struct device *dev) +{ + struct cqspi_st *cqspi = dev_get_drvdata(dev); + struct spi_master *master = dev_get_drvdata(dev); + + clk_prepare_enable(cqspi->clk); + cqspi_wait_idle(cqspi); + cqspi_controller_init(cqspi); + + cqspi->current_cs = -1; + cqspi->sclk = 0; + + return spi_master_resume(master); +} + +static const struct dev_pm_ops cqspi__dev_pm_ops = { + .suspend = cqspi_suspend, + .resume = cqspi_resume, +}; + +#define CQSPI_DEV_PM_OPS (&cqspi__dev_pm_ops) +#else +#define CQSPI_DEV_PM_OPS NULL +#endif + +static const struct cqspi_driver_platdata cdns_qspi = { + .quirks = CQSPI_DISABLE_DAC_MODE, +}; + +static const struct cqspi_driver_platdata k2g_qspi = { + .quirks = CQSPI_NEEDS_WR_DELAY, +}; + +static const struct cqspi_driver_platdata am654_ospi = { + .hwcaps_mask = CQSPI_SUPPORTS_OCTAL, + .quirks = CQSPI_NEEDS_WR_DELAY, +}; + +static const struct of_device_id cqspi_dt_ids[] = { + { + .compatible = "cdns,qspi-nor", + .data = &cdns_qspi, + }, + { + .compatible = "ti,k2g-qspi", + .data = &k2g_qspi, + }, + { + .compatible = "ti,am654-ospi", + .data = &am654_ospi, + }, + { /* end of table */ } +}; + +MODULE_DEVICE_TABLE(of, cqspi_dt_ids); + +static struct platform_driver cqspi_platform_driver = { + .probe = cqspi_probe, + .remove = cqspi_remove, + .driver = { + .name = CQSPI_NAME, + .pm = CQSPI_DEV_PM_OPS, + .of_match_table = cqspi_dt_ids, + }, +}; + +module_platform_driver(cqspi_platform_driver); + +MODULE_DESCRIPTION("Cadence QSPI Controller Driver"); +MODULE_LICENSE("GPL v2"); +MODULE_ALIAS("platform:" CQSPI_NAME); +MODULE_AUTHOR("Ley Foon Tan <lftan@altera.com>"); +MODULE_AUTHOR("Graham Moore <grmoore@opensource.altera.com>"); +MODULE_AUTHOR("Vadivel Murugan R <vadivel.muruganx.ramuthevar@intel.com>"); +MODULE_AUTHOR("Vignesh Raghavendra <vigneshr@ti.com>"); diff --git a/drivers/spi/spi-cadence.c b/drivers/spi/spi-cadence.c new file mode 100644 index 000000000..ceb16e70d --- /dev/null +++ b/drivers/spi/spi-cadence.c @@ -0,0 +1,728 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Cadence SPI controller driver (master mode only) + * + * Copyright (C) 2008 - 2014 Xilinx, Inc. + * + * based on Blackfin On-Chip SPI Driver (spi_bfin5xx.c) + */ + +#include <linux/clk.h> +#include <linux/delay.h> +#include <linux/gpio/consumer.h> +#include <linux/interrupt.h> +#include <linux/io.h> +#include <linux/module.h> +#include <linux/of_irq.h> +#include <linux/of_address.h> +#include <linux/platform_device.h> +#include <linux/pm_runtime.h> +#include <linux/spi/spi.h> + +/* Name of this driver */ +#define CDNS_SPI_NAME "cdns-spi" + +/* Register offset definitions */ +#define CDNS_SPI_CR 0x00 /* Configuration Register, RW */ +#define CDNS_SPI_ISR 0x04 /* Interrupt Status Register, RO */ +#define CDNS_SPI_IER 0x08 /* Interrupt Enable Register, WO */ +#define CDNS_SPI_IDR 0x0c /* Interrupt Disable Register, WO */ +#define CDNS_SPI_IMR 0x10 /* Interrupt Enabled Mask Register, RO */ +#define CDNS_SPI_ER 0x14 /* Enable/Disable Register, RW */ +#define CDNS_SPI_DR 0x18 /* Delay Register, RW */ +#define CDNS_SPI_TXD 0x1C /* Data Transmit Register, WO */ +#define CDNS_SPI_RXD 0x20 /* Data Receive Register, RO */ +#define CDNS_SPI_SICR 0x24 /* Slave Idle Count Register, RW */ +#define CDNS_SPI_THLD 0x28 /* Transmit FIFO Watermark Register,RW */ + +#define SPI_AUTOSUSPEND_TIMEOUT 3000 +/* + * SPI Configuration Register bit Masks + * + * This register contains various control bits that affect the operation + * of the SPI controller + */ +#define CDNS_SPI_CR_MANSTRT 0x00010000 /* Manual TX Start */ +#define CDNS_SPI_CR_CPHA 0x00000004 /* Clock Phase Control */ +#define CDNS_SPI_CR_CPOL 0x00000002 /* Clock Polarity Control */ +#define CDNS_SPI_CR_SSCTRL 0x00003C00 /* Slave Select Mask */ +#define CDNS_SPI_CR_PERI_SEL 0x00000200 /* Peripheral Select Decode */ +#define CDNS_SPI_CR_BAUD_DIV 0x00000038 /* Baud Rate Divisor Mask */ +#define CDNS_SPI_CR_MSTREN 0x00000001 /* Master Enable Mask */ +#define CDNS_SPI_CR_MANSTRTEN 0x00008000 /* Manual TX Enable Mask */ +#define CDNS_SPI_CR_SSFORCE 0x00004000 /* Manual SS Enable Mask */ +#define CDNS_SPI_CR_BAUD_DIV_4 0x00000008 /* Default Baud Div Mask */ +#define CDNS_SPI_CR_DEFAULT (CDNS_SPI_CR_MSTREN | \ + CDNS_SPI_CR_SSCTRL | \ + CDNS_SPI_CR_SSFORCE | \ + CDNS_SPI_CR_BAUD_DIV_4) + +/* + * SPI Configuration Register - Baud rate and slave select + * + * These are the values used in the calculation of baud rate divisor and + * setting the slave select. + */ + +#define CDNS_SPI_BAUD_DIV_MAX 7 /* Baud rate divisor maximum */ +#define CDNS_SPI_BAUD_DIV_MIN 1 /* Baud rate divisor minimum */ +#define CDNS_SPI_BAUD_DIV_SHIFT 3 /* Baud rate divisor shift in CR */ +#define CDNS_SPI_SS_SHIFT 10 /* Slave Select field shift in CR */ +#define CDNS_SPI_SS0 0x1 /* Slave Select zero */ + +/* + * SPI Interrupt Registers bit Masks + * + * All the four interrupt registers (Status/Mask/Enable/Disable) have the same + * bit definitions. + */ +#define CDNS_SPI_IXR_TXOW 0x00000004 /* SPI TX FIFO Overwater */ +#define CDNS_SPI_IXR_MODF 0x00000002 /* SPI Mode Fault */ +#define CDNS_SPI_IXR_RXNEMTY 0x00000010 /* SPI RX FIFO Not Empty */ +#define CDNS_SPI_IXR_DEFAULT (CDNS_SPI_IXR_TXOW | \ + CDNS_SPI_IXR_MODF) +#define CDNS_SPI_IXR_TXFULL 0x00000008 /* SPI TX Full */ +#define CDNS_SPI_IXR_ALL 0x0000007F /* SPI all interrupts */ + +/* + * SPI Enable Register bit Masks + * + * This register is used to enable or disable the SPI controller + */ +#define CDNS_SPI_ER_ENABLE 0x00000001 /* SPI Enable Bit Mask */ +#define CDNS_SPI_ER_DISABLE 0x0 /* SPI Disable Bit Mask */ + +/* SPI FIFO depth in bytes */ +#define CDNS_SPI_FIFO_DEPTH 128 + +/* Default number of chip select lines */ +#define CDNS_SPI_DEFAULT_NUM_CS 4 + +/** + * struct cdns_spi - This definition defines spi driver instance + * @regs: Virtual address of the SPI controller registers + * @ref_clk: Pointer to the peripheral clock + * @pclk: Pointer to the APB clock + * @speed_hz: Current SPI bus clock speed in Hz + * @txbuf: Pointer to the TX buffer + * @rxbuf: Pointer to the RX buffer + * @tx_bytes: Number of bytes left to transfer + * @rx_bytes: Number of bytes requested + * @dev_busy: Device busy flag + * @is_decoded_cs: Flag for decoder property set or not + */ +struct cdns_spi { + void __iomem *regs; + struct clk *ref_clk; + struct clk *pclk; + unsigned int clk_rate; + u32 speed_hz; + const u8 *txbuf; + u8 *rxbuf; + int tx_bytes; + int rx_bytes; + u8 dev_busy; + u32 is_decoded_cs; +}; + +/* Macros for the SPI controller read/write */ +static inline u32 cdns_spi_read(struct cdns_spi *xspi, u32 offset) +{ + return readl_relaxed(xspi->regs + offset); +} + +static inline void cdns_spi_write(struct cdns_spi *xspi, u32 offset, u32 val) +{ + writel_relaxed(val, xspi->regs + offset); +} + +/** + * cdns_spi_init_hw - Initialize the hardware and configure the SPI controller + * @xspi: Pointer to the cdns_spi structure + * + * On reset the SPI controller is configured to be in master mode, baud rate + * divisor is set to 4, threshold value for TX FIFO not full interrupt is set + * to 1 and size of the word to be transferred as 8 bit. + * This function initializes the SPI controller to disable and clear all the + * interrupts, enable manual slave select and manual start, deselect all the + * chip select lines, and enable the SPI controller. + */ +static void cdns_spi_init_hw(struct cdns_spi *xspi) +{ + u32 ctrl_reg = CDNS_SPI_CR_DEFAULT; + + if (xspi->is_decoded_cs) + ctrl_reg |= CDNS_SPI_CR_PERI_SEL; + + cdns_spi_write(xspi, CDNS_SPI_ER, CDNS_SPI_ER_DISABLE); + cdns_spi_write(xspi, CDNS_SPI_IDR, CDNS_SPI_IXR_ALL); + + /* Clear the RX FIFO */ + while (cdns_spi_read(xspi, CDNS_SPI_ISR) & CDNS_SPI_IXR_RXNEMTY) + cdns_spi_read(xspi, CDNS_SPI_RXD); + + cdns_spi_write(xspi, CDNS_SPI_ISR, CDNS_SPI_IXR_ALL); + cdns_spi_write(xspi, CDNS_SPI_CR, ctrl_reg); + cdns_spi_write(xspi, CDNS_SPI_ER, CDNS_SPI_ER_ENABLE); +} + +/** + * cdns_spi_chipselect - Select or deselect the chip select line + * @spi: Pointer to the spi_device structure + * @is_high: Select(0) or deselect (1) the chip select line + */ +static void cdns_spi_chipselect(struct spi_device *spi, bool is_high) +{ + struct cdns_spi *xspi = spi_master_get_devdata(spi->master); + u32 ctrl_reg; + + ctrl_reg = cdns_spi_read(xspi, CDNS_SPI_CR); + + if (is_high) { + /* Deselect the slave */ + ctrl_reg |= CDNS_SPI_CR_SSCTRL; + } else { + /* Select the slave */ + ctrl_reg &= ~CDNS_SPI_CR_SSCTRL; + if (!(xspi->is_decoded_cs)) + ctrl_reg |= ((~(CDNS_SPI_SS0 << spi->chip_select)) << + CDNS_SPI_SS_SHIFT) & + CDNS_SPI_CR_SSCTRL; + else + ctrl_reg |= (spi->chip_select << CDNS_SPI_SS_SHIFT) & + CDNS_SPI_CR_SSCTRL; + } + + cdns_spi_write(xspi, CDNS_SPI_CR, ctrl_reg); +} + +/** + * cdns_spi_config_clock_mode - Sets clock polarity and phase + * @spi: Pointer to the spi_device structure + * + * Sets the requested clock polarity and phase. + */ +static void cdns_spi_config_clock_mode(struct spi_device *spi) +{ + struct cdns_spi *xspi = spi_master_get_devdata(spi->master); + u32 ctrl_reg, new_ctrl_reg; + + new_ctrl_reg = cdns_spi_read(xspi, CDNS_SPI_CR); + ctrl_reg = new_ctrl_reg; + + /* Set the SPI clock phase and clock polarity */ + new_ctrl_reg &= ~(CDNS_SPI_CR_CPHA | CDNS_SPI_CR_CPOL); + if (spi->mode & SPI_CPHA) + new_ctrl_reg |= CDNS_SPI_CR_CPHA; + if (spi->mode & SPI_CPOL) + new_ctrl_reg |= CDNS_SPI_CR_CPOL; + + if (new_ctrl_reg != ctrl_reg) { + /* + * Just writing the CR register does not seem to apply the clock + * setting changes. This is problematic when changing the clock + * polarity as it will cause the SPI slave to see spurious clock + * transitions. To workaround the issue toggle the ER register. + */ + cdns_spi_write(xspi, CDNS_SPI_ER, CDNS_SPI_ER_DISABLE); + cdns_spi_write(xspi, CDNS_SPI_CR, new_ctrl_reg); + cdns_spi_write(xspi, CDNS_SPI_ER, CDNS_SPI_ER_ENABLE); + } +} + +/** + * cdns_spi_config_clock_freq - Sets clock frequency + * @spi: Pointer to the spi_device structure + * @transfer: Pointer to the spi_transfer structure which provides + * information about next transfer setup parameters + * + * Sets the requested clock frequency. + * Note: If the requested frequency is not an exact match with what can be + * obtained using the prescalar value the driver sets the clock frequency which + * is lower than the requested frequency (maximum lower) for the transfer. If + * the requested frequency is higher or lower than that is supported by the SPI + * controller the driver will set the highest or lowest frequency supported by + * controller. + */ +static void cdns_spi_config_clock_freq(struct spi_device *spi, + struct spi_transfer *transfer) +{ + struct cdns_spi *xspi = spi_master_get_devdata(spi->master); + u32 ctrl_reg, baud_rate_val; + unsigned long frequency; + + frequency = xspi->clk_rate; + + ctrl_reg = cdns_spi_read(xspi, CDNS_SPI_CR); + + /* Set the clock frequency */ + if (xspi->speed_hz != transfer->speed_hz) { + /* first valid value is 1 */ + baud_rate_val = CDNS_SPI_BAUD_DIV_MIN; + while ((baud_rate_val < CDNS_SPI_BAUD_DIV_MAX) && + (frequency / (2 << baud_rate_val)) > transfer->speed_hz) + baud_rate_val++; + + ctrl_reg &= ~CDNS_SPI_CR_BAUD_DIV; + ctrl_reg |= baud_rate_val << CDNS_SPI_BAUD_DIV_SHIFT; + + xspi->speed_hz = frequency / (2 << baud_rate_val); + } + cdns_spi_write(xspi, CDNS_SPI_CR, ctrl_reg); +} + +/** + * cdns_spi_setup_transfer - Configure SPI controller for specified transfer + * @spi: Pointer to the spi_device structure + * @transfer: Pointer to the spi_transfer structure which provides + * information about next transfer setup parameters + * + * Sets the operational mode of SPI controller for the next SPI transfer and + * sets the requested clock frequency. + * + * Return: Always 0 + */ +static int cdns_spi_setup_transfer(struct spi_device *spi, + struct spi_transfer *transfer) +{ + struct cdns_spi *xspi = spi_master_get_devdata(spi->master); + + cdns_spi_config_clock_freq(spi, transfer); + + dev_dbg(&spi->dev, "%s, mode %d, %u bits/w, %u clock speed\n", + __func__, spi->mode, spi->bits_per_word, + xspi->speed_hz); + + return 0; +} + +/** + * cdns_spi_fill_tx_fifo - Fills the TX FIFO with as many bytes as possible + * @xspi: Pointer to the cdns_spi structure + */ +static void cdns_spi_fill_tx_fifo(struct cdns_spi *xspi) +{ + unsigned long trans_cnt = 0; + + while ((trans_cnt < CDNS_SPI_FIFO_DEPTH) && + (xspi->tx_bytes > 0)) { + + /* When xspi in busy condition, bytes may send failed, + * then spi control did't work thoroughly, add one byte delay + */ + if (cdns_spi_read(xspi, CDNS_SPI_ISR) & + CDNS_SPI_IXR_TXFULL) + udelay(10); + + if (xspi->txbuf) + cdns_spi_write(xspi, CDNS_SPI_TXD, *xspi->txbuf++); + else + cdns_spi_write(xspi, CDNS_SPI_TXD, 0); + + xspi->tx_bytes--; + trans_cnt++; + } +} + +/** + * cdns_spi_irq - Interrupt service routine of the SPI controller + * @irq: IRQ number + * @dev_id: Pointer to the xspi structure + * + * This function handles TX empty and Mode Fault interrupts only. + * On TX empty interrupt this function reads the received data from RX FIFO and + * fills the TX FIFO if there is any data remaining to be transferred. + * On Mode Fault interrupt this function indicates that transfer is completed, + * the SPI subsystem will identify the error as the remaining bytes to be + * transferred is non-zero. + * + * Return: IRQ_HANDLED when handled; IRQ_NONE otherwise. + */ +static irqreturn_t cdns_spi_irq(int irq, void *dev_id) +{ + struct spi_master *master = dev_id; + struct cdns_spi *xspi = spi_master_get_devdata(master); + u32 intr_status, status; + + status = IRQ_NONE; + intr_status = cdns_spi_read(xspi, CDNS_SPI_ISR); + cdns_spi_write(xspi, CDNS_SPI_ISR, intr_status); + + if (intr_status & CDNS_SPI_IXR_MODF) { + /* Indicate that transfer is completed, the SPI subsystem will + * identify the error as the remaining bytes to be + * transferred is non-zero + */ + cdns_spi_write(xspi, CDNS_SPI_IDR, CDNS_SPI_IXR_DEFAULT); + spi_finalize_current_transfer(master); + status = IRQ_HANDLED; + } else if (intr_status & CDNS_SPI_IXR_TXOW) { + unsigned long trans_cnt; + + trans_cnt = xspi->rx_bytes - xspi->tx_bytes; + + /* Read out the data from the RX FIFO */ + while (trans_cnt) { + u8 data; + + data = cdns_spi_read(xspi, CDNS_SPI_RXD); + if (xspi->rxbuf) + *xspi->rxbuf++ = data; + + xspi->rx_bytes--; + trans_cnt--; + } + + if (xspi->tx_bytes) { + /* There is more data to send */ + cdns_spi_fill_tx_fifo(xspi); + } else { + /* Transfer is completed */ + cdns_spi_write(xspi, CDNS_SPI_IDR, + CDNS_SPI_IXR_DEFAULT); + spi_finalize_current_transfer(master); + } + status = IRQ_HANDLED; + } + + return status; +} + +static int cdns_prepare_message(struct spi_master *master, + struct spi_message *msg) +{ + cdns_spi_config_clock_mode(msg->spi); + return 0; +} + +/** + * cdns_transfer_one - Initiates the SPI transfer + * @master: Pointer to spi_master structure + * @spi: Pointer to the spi_device structure + * @transfer: Pointer to the spi_transfer structure which provides + * information about next transfer parameters + * + * This function fills the TX FIFO, starts the SPI transfer and + * returns a positive transfer count so that core will wait for completion. + * + * Return: Number of bytes transferred in the last transfer + */ +static int cdns_transfer_one(struct spi_master *master, + struct spi_device *spi, + struct spi_transfer *transfer) +{ + struct cdns_spi *xspi = spi_master_get_devdata(master); + + xspi->txbuf = transfer->tx_buf; + xspi->rxbuf = transfer->rx_buf; + xspi->tx_bytes = transfer->len; + xspi->rx_bytes = transfer->len; + + cdns_spi_setup_transfer(spi, transfer); + cdns_spi_fill_tx_fifo(xspi); + spi_transfer_delay_exec(transfer); + + cdns_spi_write(xspi, CDNS_SPI_IER, CDNS_SPI_IXR_DEFAULT); + return transfer->len; +} + +/** + * cdns_prepare_transfer_hardware - Prepares hardware for transfer. + * @master: Pointer to the spi_master structure which provides + * information about the controller. + * + * This function enables SPI master controller. + * + * Return: 0 always + */ +static int cdns_prepare_transfer_hardware(struct spi_master *master) +{ + struct cdns_spi *xspi = spi_master_get_devdata(master); + + cdns_spi_write(xspi, CDNS_SPI_ER, CDNS_SPI_ER_ENABLE); + + return 0; +} + +/** + * cdns_unprepare_transfer_hardware - Relaxes hardware after transfer + * @master: Pointer to the spi_master structure which provides + * information about the controller. + * + * This function disables the SPI master controller. + * + * Return: 0 always + */ +static int cdns_unprepare_transfer_hardware(struct spi_master *master) +{ + struct cdns_spi *xspi = spi_master_get_devdata(master); + + cdns_spi_write(xspi, CDNS_SPI_ER, CDNS_SPI_ER_DISABLE); + + return 0; +} + +/** + * cdns_spi_probe - Probe method for the SPI driver + * @pdev: Pointer to the platform_device structure + * + * This function initializes the driver data structures and the hardware. + * + * Return: 0 on success and error value on error + */ +static int cdns_spi_probe(struct platform_device *pdev) +{ + int ret = 0, irq; + struct spi_master *master; + struct cdns_spi *xspi; + u32 num_cs; + + master = spi_alloc_master(&pdev->dev, sizeof(*xspi)); + if (!master) + return -ENOMEM; + + xspi = spi_master_get_devdata(master); + master->dev.of_node = pdev->dev.of_node; + platform_set_drvdata(pdev, master); + + xspi->regs = devm_platform_ioremap_resource(pdev, 0); + if (IS_ERR(xspi->regs)) { + ret = PTR_ERR(xspi->regs); + goto remove_master; + } + + xspi->pclk = devm_clk_get(&pdev->dev, "pclk"); + if (IS_ERR(xspi->pclk)) { + dev_err(&pdev->dev, "pclk clock not found.\n"); + ret = PTR_ERR(xspi->pclk); + goto remove_master; + } + + xspi->ref_clk = devm_clk_get(&pdev->dev, "ref_clk"); + if (IS_ERR(xspi->ref_clk)) { + dev_err(&pdev->dev, "ref_clk clock not found.\n"); + ret = PTR_ERR(xspi->ref_clk); + goto remove_master; + } + + ret = clk_prepare_enable(xspi->pclk); + if (ret) { + dev_err(&pdev->dev, "Unable to enable APB clock.\n"); + goto remove_master; + } + + ret = clk_prepare_enable(xspi->ref_clk); + if (ret) { + dev_err(&pdev->dev, "Unable to enable device clock.\n"); + goto clk_dis_apb; + } + + pm_runtime_use_autosuspend(&pdev->dev); + pm_runtime_set_autosuspend_delay(&pdev->dev, SPI_AUTOSUSPEND_TIMEOUT); + pm_runtime_get_noresume(&pdev->dev); + pm_runtime_set_active(&pdev->dev); + pm_runtime_enable(&pdev->dev); + + ret = of_property_read_u32(pdev->dev.of_node, "num-cs", &num_cs); + if (ret < 0) + master->num_chipselect = CDNS_SPI_DEFAULT_NUM_CS; + else + master->num_chipselect = num_cs; + + ret = of_property_read_u32(pdev->dev.of_node, "is-decoded-cs", + &xspi->is_decoded_cs); + if (ret < 0) + xspi->is_decoded_cs = 0; + + /* SPI controller initializations */ + cdns_spi_init_hw(xspi); + + irq = platform_get_irq(pdev, 0); + if (irq <= 0) { + ret = -ENXIO; + goto clk_dis_all; + } + + ret = devm_request_irq(&pdev->dev, irq, cdns_spi_irq, + 0, pdev->name, master); + if (ret != 0) { + ret = -ENXIO; + dev_err(&pdev->dev, "request_irq failed\n"); + goto clk_dis_all; + } + + master->use_gpio_descriptors = true; + master->prepare_transfer_hardware = cdns_prepare_transfer_hardware; + master->prepare_message = cdns_prepare_message; + master->transfer_one = cdns_transfer_one; + master->unprepare_transfer_hardware = cdns_unprepare_transfer_hardware; + master->set_cs = cdns_spi_chipselect; + master->auto_runtime_pm = true; + master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH; + + xspi->clk_rate = clk_get_rate(xspi->ref_clk); + /* Set to default valid value */ + master->max_speed_hz = xspi->clk_rate / 4; + xspi->speed_hz = master->max_speed_hz; + + master->bits_per_word_mask = SPI_BPW_MASK(8); + + pm_runtime_mark_last_busy(&pdev->dev); + pm_runtime_put_autosuspend(&pdev->dev); + + ret = spi_register_master(master); + if (ret) { + dev_err(&pdev->dev, "spi_register_master failed\n"); + goto clk_dis_all; + } + + return ret; + +clk_dis_all: + pm_runtime_set_suspended(&pdev->dev); + pm_runtime_disable(&pdev->dev); + clk_disable_unprepare(xspi->ref_clk); +clk_dis_apb: + clk_disable_unprepare(xspi->pclk); +remove_master: + spi_master_put(master); + return ret; +} + +/** + * cdns_spi_remove - Remove method for the SPI driver + * @pdev: Pointer to the platform_device structure + * + * This function is called if a device is physically removed from the system or + * if the driver module is being unloaded. It frees all resources allocated to + * the device. + * + * Return: 0 on success and error value on error + */ +static int cdns_spi_remove(struct platform_device *pdev) +{ + struct spi_master *master = platform_get_drvdata(pdev); + struct cdns_spi *xspi = spi_master_get_devdata(master); + + cdns_spi_write(xspi, CDNS_SPI_ER, CDNS_SPI_ER_DISABLE); + + clk_disable_unprepare(xspi->ref_clk); + clk_disable_unprepare(xspi->pclk); + pm_runtime_set_suspended(&pdev->dev); + pm_runtime_disable(&pdev->dev); + + spi_unregister_master(master); + + return 0; +} + +/** + * cdns_spi_suspend - Suspend method for the SPI driver + * @dev: Address of the platform_device structure + * + * This function disables the SPI controller and + * changes the driver state to "suspend" + * + * Return: 0 on success and error value on error + */ +static int __maybe_unused cdns_spi_suspend(struct device *dev) +{ + struct spi_master *master = dev_get_drvdata(dev); + + return spi_master_suspend(master); +} + +/** + * cdns_spi_resume - Resume method for the SPI driver + * @dev: Address of the platform_device structure + * + * This function changes the driver state to "ready" + * + * Return: 0 on success and error value on error + */ +static int __maybe_unused cdns_spi_resume(struct device *dev) +{ + struct spi_master *master = dev_get_drvdata(dev); + struct cdns_spi *xspi = spi_master_get_devdata(master); + + cdns_spi_init_hw(xspi); + return spi_master_resume(master); +} + +/** + * cdns_spi_runtime_resume - Runtime resume method for the SPI driver + * @dev: Address of the platform_device structure + * + * This function enables the clocks + * + * Return: 0 on success and error value on error + */ +static int __maybe_unused cnds_runtime_resume(struct device *dev) +{ + struct spi_master *master = dev_get_drvdata(dev); + struct cdns_spi *xspi = spi_master_get_devdata(master); + int ret; + + ret = clk_prepare_enable(xspi->pclk); + if (ret) { + dev_err(dev, "Cannot enable APB clock.\n"); + return ret; + } + + ret = clk_prepare_enable(xspi->ref_clk); + if (ret) { + dev_err(dev, "Cannot enable device clock.\n"); + clk_disable_unprepare(xspi->pclk); + return ret; + } + return 0; +} + +/** + * cdns_spi_runtime_suspend - Runtime suspend method for the SPI driver + * @dev: Address of the platform_device structure + * + * This function disables the clocks + * + * Return: Always 0 + */ +static int __maybe_unused cnds_runtime_suspend(struct device *dev) +{ + struct spi_master *master = dev_get_drvdata(dev); + struct cdns_spi *xspi = spi_master_get_devdata(master); + + clk_disable_unprepare(xspi->ref_clk); + clk_disable_unprepare(xspi->pclk); + + return 0; +} + +static const struct dev_pm_ops cdns_spi_dev_pm_ops = { + SET_RUNTIME_PM_OPS(cnds_runtime_suspend, + cnds_runtime_resume, NULL) + SET_SYSTEM_SLEEP_PM_OPS(cdns_spi_suspend, cdns_spi_resume) +}; + +static const struct of_device_id cdns_spi_of_match[] = { + { .compatible = "xlnx,zynq-spi-r1p6" }, + { .compatible = "cdns,spi-r1p6" }, + { /* end of table */ } +}; +MODULE_DEVICE_TABLE(of, cdns_spi_of_match); + +/* cdns_spi_driver - This structure defines the SPI subsystem platform driver */ +static struct platform_driver cdns_spi_driver = { + .probe = cdns_spi_probe, + .remove = cdns_spi_remove, + .driver = { + .name = CDNS_SPI_NAME, + .of_match_table = cdns_spi_of_match, + .pm = &cdns_spi_dev_pm_ops, + }, +}; + +module_platform_driver(cdns_spi_driver); + +MODULE_AUTHOR("Xilinx, Inc."); +MODULE_DESCRIPTION("Cadence SPI driver"); +MODULE_LICENSE("GPL"); diff --git a/drivers/spi/spi-cavium-octeon.c b/drivers/spi/spi-cavium-octeon.c new file mode 100644 index 000000000..1a2de6ce9 --- /dev/null +++ b/drivers/spi/spi-cavium-octeon.c @@ -0,0 +1,102 @@ +/* + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file "COPYING" in the main directory of this archive + * for more details. + * + * Copyright (C) 2011, 2012 Cavium, Inc. + */ + +#include <linux/platform_device.h> +#include <linux/spi/spi.h> +#include <linux/module.h> +#include <linux/io.h> +#include <linux/of.h> + +#include <asm/octeon/octeon.h> + +#include "spi-cavium.h" + +static int octeon_spi_probe(struct platform_device *pdev) +{ + void __iomem *reg_base; + struct spi_master *master; + struct octeon_spi *p; + int err = -ENOENT; + + master = spi_alloc_master(&pdev->dev, sizeof(struct octeon_spi)); + if (!master) + return -ENOMEM; + p = spi_master_get_devdata(master); + platform_set_drvdata(pdev, master); + + reg_base = devm_platform_ioremap_resource(pdev, 0); + if (IS_ERR(reg_base)) { + err = PTR_ERR(reg_base); + goto fail; + } + + p->register_base = reg_base; + p->sys_freq = octeon_get_io_clock_rate(); + + p->regs.config = 0; + p->regs.status = 0x08; + p->regs.tx = 0x10; + p->regs.data = 0x80; + + master->num_chipselect = 4; + master->mode_bits = SPI_CPHA | + SPI_CPOL | + SPI_CS_HIGH | + SPI_LSB_FIRST | + SPI_3WIRE; + + master->transfer_one_message = octeon_spi_transfer_one_message; + master->bits_per_word_mask = SPI_BPW_MASK(8); + master->max_speed_hz = OCTEON_SPI_MAX_CLOCK_HZ; + + master->dev.of_node = pdev->dev.of_node; + err = devm_spi_register_master(&pdev->dev, master); + if (err) { + dev_err(&pdev->dev, "register master failed: %d\n", err); + goto fail; + } + + dev_info(&pdev->dev, "OCTEON SPI bus driver\n"); + + return 0; +fail: + spi_master_put(master); + return err; +} + +static int octeon_spi_remove(struct platform_device *pdev) +{ + struct spi_master *master = platform_get_drvdata(pdev); + struct octeon_spi *p = spi_master_get_devdata(master); + + /* Clear the CSENA* and put everything in a known state. */ + writeq(0, p->register_base + OCTEON_SPI_CFG(p)); + + return 0; +} + +static const struct of_device_id octeon_spi_match[] = { + { .compatible = "cavium,octeon-3010-spi", }, + {}, +}; +MODULE_DEVICE_TABLE(of, octeon_spi_match); + +static struct platform_driver octeon_spi_driver = { + .driver = { + .name = "spi-octeon", + .of_match_table = octeon_spi_match, + }, + .probe = octeon_spi_probe, + .remove = octeon_spi_remove, +}; + +module_platform_driver(octeon_spi_driver); + +MODULE_DESCRIPTION("Cavium, Inc. OCTEON SPI bus driver"); +MODULE_AUTHOR("David Daney"); +MODULE_LICENSE("GPL"); diff --git a/drivers/spi/spi-cavium-thunderx.c b/drivers/spi/spi-cavium-thunderx.c new file mode 100644 index 000000000..60c0d6934 --- /dev/null +++ b/drivers/spi/spi-cavium-thunderx.c @@ -0,0 +1,124 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Cavium ThunderX SPI driver. + * + * Copyright (C) 2016 Cavium Inc. + * Authors: Jan Glauber <jglauber@cavium.com> + */ + +#include <linux/module.h> +#include <linux/pci.h> +#include <linux/spi/spi.h> + +#include "spi-cavium.h" + +#define DRV_NAME "spi-thunderx" + +#define SYS_FREQ_DEFAULT 700000000 /* 700 Mhz */ + +static int thunderx_spi_probe(struct pci_dev *pdev, + const struct pci_device_id *ent) +{ + struct device *dev = &pdev->dev; + struct spi_master *master; + struct octeon_spi *p; + int ret; + + master = spi_alloc_master(dev, sizeof(struct octeon_spi)); + if (!master) + return -ENOMEM; + + p = spi_master_get_devdata(master); + + ret = pcim_enable_device(pdev); + if (ret) + goto error; + + ret = pci_request_regions(pdev, DRV_NAME); + if (ret) + goto error; + + p->register_base = pcim_iomap(pdev, 0, pci_resource_len(pdev, 0)); + if (!p->register_base) { + ret = -EINVAL; + goto error; + } + + p->regs.config = 0x1000; + p->regs.status = 0x1008; + p->regs.tx = 0x1010; + p->regs.data = 0x1080; + + p->clk = devm_clk_get(dev, NULL); + if (IS_ERR(p->clk)) { + ret = PTR_ERR(p->clk); + goto error; + } + + ret = clk_prepare_enable(p->clk); + if (ret) + goto error; + + p->sys_freq = clk_get_rate(p->clk); + if (!p->sys_freq) + p->sys_freq = SYS_FREQ_DEFAULT; + dev_info(dev, "Set system clock to %u\n", p->sys_freq); + + master->flags = SPI_MASTER_HALF_DUPLEX; + master->num_chipselect = 4; + master->mode_bits = SPI_CPHA | SPI_CPOL | SPI_CS_HIGH | + SPI_LSB_FIRST | SPI_3WIRE; + master->transfer_one_message = octeon_spi_transfer_one_message; + master->bits_per_word_mask = SPI_BPW_MASK(8); + master->max_speed_hz = OCTEON_SPI_MAX_CLOCK_HZ; + master->dev.of_node = pdev->dev.of_node; + + pci_set_drvdata(pdev, master); + + ret = devm_spi_register_master(dev, master); + if (ret) + goto error; + + return 0; + +error: + clk_disable_unprepare(p->clk); + pci_release_regions(pdev); + spi_master_put(master); + return ret; +} + +static void thunderx_spi_remove(struct pci_dev *pdev) +{ + struct spi_master *master = pci_get_drvdata(pdev); + struct octeon_spi *p; + + p = spi_master_get_devdata(master); + if (!p) + return; + + clk_disable_unprepare(p->clk); + pci_release_regions(pdev); + /* Put everything in a known state. */ + writeq(0, p->register_base + OCTEON_SPI_CFG(p)); +} + +static const struct pci_device_id thunderx_spi_pci_id_table[] = { + { PCI_DEVICE(PCI_VENDOR_ID_CAVIUM, 0xa00b) }, + { 0, } +}; + +MODULE_DEVICE_TABLE(pci, thunderx_spi_pci_id_table); + +static struct pci_driver thunderx_spi_driver = { + .name = DRV_NAME, + .id_table = thunderx_spi_pci_id_table, + .probe = thunderx_spi_probe, + .remove = thunderx_spi_remove, +}; + +module_pci_driver(thunderx_spi_driver); + +MODULE_DESCRIPTION("Cavium, Inc. ThunderX SPI bus driver"); +MODULE_AUTHOR("Jan Glauber"); +MODULE_LICENSE("GPL"); diff --git a/drivers/spi/spi-cavium.c b/drivers/spi/spi-cavium.c new file mode 100644 index 000000000..6854c3ce4 --- /dev/null +++ b/drivers/spi/spi-cavium.c @@ -0,0 +1,150 @@ +/* + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file "COPYING" in the main directory of this archive + * for more details. + * + * Copyright (C) 2011, 2012 Cavium, Inc. + */ + +#include <linux/spi/spi.h> +#include <linux/module.h> +#include <linux/delay.h> +#include <linux/io.h> + +#include "spi-cavium.h" + +static void octeon_spi_wait_ready(struct octeon_spi *p) +{ + union cvmx_mpi_sts mpi_sts; + unsigned int loops = 0; + + do { + if (loops++) + __delay(500); + mpi_sts.u64 = readq(p->register_base + OCTEON_SPI_STS(p)); + } while (mpi_sts.s.busy); +} + +static int octeon_spi_do_transfer(struct octeon_spi *p, + struct spi_message *msg, + struct spi_transfer *xfer, + bool last_xfer) +{ + struct spi_device *spi = msg->spi; + union cvmx_mpi_cfg mpi_cfg; + union cvmx_mpi_tx mpi_tx; + unsigned int clkdiv; + int mode; + bool cpha, cpol; + const u8 *tx_buf; + u8 *rx_buf; + int len; + int i; + + mode = spi->mode; + cpha = mode & SPI_CPHA; + cpol = mode & SPI_CPOL; + + clkdiv = p->sys_freq / (2 * xfer->speed_hz); + + mpi_cfg.u64 = 0; + + mpi_cfg.s.clkdiv = clkdiv; + mpi_cfg.s.cshi = (mode & SPI_CS_HIGH) ? 1 : 0; + mpi_cfg.s.lsbfirst = (mode & SPI_LSB_FIRST) ? 1 : 0; + mpi_cfg.s.wireor = (mode & SPI_3WIRE) ? 1 : 0; + mpi_cfg.s.idlelo = cpha != cpol; + mpi_cfg.s.cslate = cpha ? 1 : 0; + mpi_cfg.s.enable = 1; + + if (spi->chip_select < 4) + p->cs_enax |= 1ull << (12 + spi->chip_select); + mpi_cfg.u64 |= p->cs_enax; + + if (mpi_cfg.u64 != p->last_cfg) { + p->last_cfg = mpi_cfg.u64; + writeq(mpi_cfg.u64, p->register_base + OCTEON_SPI_CFG(p)); + } + tx_buf = xfer->tx_buf; + rx_buf = xfer->rx_buf; + len = xfer->len; + while (len > OCTEON_SPI_MAX_BYTES) { + for (i = 0; i < OCTEON_SPI_MAX_BYTES; i++) { + u8 d; + if (tx_buf) + d = *tx_buf++; + else + d = 0; + writeq(d, p->register_base + OCTEON_SPI_DAT0(p) + (8 * i)); + } + mpi_tx.u64 = 0; + mpi_tx.s.csid = spi->chip_select; + mpi_tx.s.leavecs = 1; + mpi_tx.s.txnum = tx_buf ? OCTEON_SPI_MAX_BYTES : 0; + mpi_tx.s.totnum = OCTEON_SPI_MAX_BYTES; + writeq(mpi_tx.u64, p->register_base + OCTEON_SPI_TX(p)); + + octeon_spi_wait_ready(p); + if (rx_buf) + for (i = 0; i < OCTEON_SPI_MAX_BYTES; i++) { + u64 v = readq(p->register_base + OCTEON_SPI_DAT0(p) + (8 * i)); + *rx_buf++ = (u8)v; + } + len -= OCTEON_SPI_MAX_BYTES; + } + + for (i = 0; i < len; i++) { + u8 d; + if (tx_buf) + d = *tx_buf++; + else + d = 0; + writeq(d, p->register_base + OCTEON_SPI_DAT0(p) + (8 * i)); + } + + mpi_tx.u64 = 0; + mpi_tx.s.csid = spi->chip_select; + if (last_xfer) + mpi_tx.s.leavecs = xfer->cs_change; + else + mpi_tx.s.leavecs = !xfer->cs_change; + mpi_tx.s.txnum = tx_buf ? len : 0; + mpi_tx.s.totnum = len; + writeq(mpi_tx.u64, p->register_base + OCTEON_SPI_TX(p)); + + octeon_spi_wait_ready(p); + if (rx_buf) + for (i = 0; i < len; i++) { + u64 v = readq(p->register_base + OCTEON_SPI_DAT0(p) + (8 * i)); + *rx_buf++ = (u8)v; + } + + spi_transfer_delay_exec(xfer); + + return xfer->len; +} + +int octeon_spi_transfer_one_message(struct spi_master *master, + struct spi_message *msg) +{ + struct octeon_spi *p = spi_master_get_devdata(master); + unsigned int total_len = 0; + int status = 0; + struct spi_transfer *xfer; + + list_for_each_entry(xfer, &msg->transfers, transfer_list) { + bool last_xfer = list_is_last(&xfer->transfer_list, + &msg->transfers); + int r = octeon_spi_do_transfer(p, msg, xfer, last_xfer); + if (r < 0) { + status = r; + goto err; + } + total_len += r; + } +err: + msg->status = status; + msg->actual_length = total_len; + spi_finalize_current_message(master); + return status; +} diff --git a/drivers/spi/spi-cavium.h b/drivers/spi/spi-cavium.h new file mode 100644 index 000000000..1f3ac463a --- /dev/null +++ b/drivers/spi/spi-cavium.h @@ -0,0 +1,333 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef __SPI_CAVIUM_H +#define __SPI_CAVIUM_H + +#include <linux/clk.h> + +#define OCTEON_SPI_MAX_BYTES 9 +#define OCTEON_SPI_MAX_CLOCK_HZ 16000000 + +struct octeon_spi_regs { + int config; + int status; + int tx; + int data; +}; + +struct octeon_spi { + void __iomem *register_base; + u64 last_cfg; + u64 cs_enax; + int sys_freq; + struct octeon_spi_regs regs; + struct clk *clk; +}; + +#define OCTEON_SPI_CFG(x) (x->regs.config) +#define OCTEON_SPI_STS(x) (x->regs.status) +#define OCTEON_SPI_TX(x) (x->regs.tx) +#define OCTEON_SPI_DAT0(x) (x->regs.data) + +int octeon_spi_transfer_one_message(struct spi_master *master, + struct spi_message *msg); + +/* MPI register descriptions */ + +#define CVMX_MPI_CFG (CVMX_ADD_IO_SEG(0x0001070000001000ull)) +#define CVMX_MPI_DATX(offset) (CVMX_ADD_IO_SEG(0x0001070000001080ull) + ((offset) & 15) * 8) +#define CVMX_MPI_STS (CVMX_ADD_IO_SEG(0x0001070000001008ull)) +#define CVMX_MPI_TX (CVMX_ADD_IO_SEG(0x0001070000001010ull)) + +union cvmx_mpi_cfg { + uint64_t u64; + struct cvmx_mpi_cfg_s { +#ifdef __BIG_ENDIAN_BITFIELD + uint64_t reserved_29_63:35; + uint64_t clkdiv:13; + uint64_t csena3:1; + uint64_t csena2:1; + uint64_t csena1:1; + uint64_t csena0:1; + uint64_t cslate:1; + uint64_t tritx:1; + uint64_t idleclks:2; + uint64_t cshi:1; + uint64_t csena:1; + uint64_t int_ena:1; + uint64_t lsbfirst:1; + uint64_t wireor:1; + uint64_t clk_cont:1; + uint64_t idlelo:1; + uint64_t enable:1; +#else + uint64_t enable:1; + uint64_t idlelo:1; + uint64_t clk_cont:1; + uint64_t wireor:1; + uint64_t lsbfirst:1; + uint64_t int_ena:1; + uint64_t csena:1; + uint64_t cshi:1; + uint64_t idleclks:2; + uint64_t tritx:1; + uint64_t cslate:1; + uint64_t csena0:1; + uint64_t csena1:1; + uint64_t csena2:1; + uint64_t csena3:1; + uint64_t clkdiv:13; + uint64_t reserved_29_63:35; +#endif + } s; + struct cvmx_mpi_cfg_cn30xx { +#ifdef __BIG_ENDIAN_BITFIELD + uint64_t reserved_29_63:35; + uint64_t clkdiv:13; + uint64_t reserved_12_15:4; + uint64_t cslate:1; + uint64_t tritx:1; + uint64_t idleclks:2; + uint64_t cshi:1; + uint64_t csena:1; + uint64_t int_ena:1; + uint64_t lsbfirst:1; + uint64_t wireor:1; + uint64_t clk_cont:1; + uint64_t idlelo:1; + uint64_t enable:1; +#else + uint64_t enable:1; + uint64_t idlelo:1; + uint64_t clk_cont:1; + uint64_t wireor:1; + uint64_t lsbfirst:1; + uint64_t int_ena:1; + uint64_t csena:1; + uint64_t cshi:1; + uint64_t idleclks:2; + uint64_t tritx:1; + uint64_t cslate:1; + uint64_t reserved_12_15:4; + uint64_t clkdiv:13; + uint64_t reserved_29_63:35; +#endif + } cn30xx; + struct cvmx_mpi_cfg_cn31xx { +#ifdef __BIG_ENDIAN_BITFIELD + uint64_t reserved_29_63:35; + uint64_t clkdiv:13; + uint64_t reserved_11_15:5; + uint64_t tritx:1; + uint64_t idleclks:2; + uint64_t cshi:1; + uint64_t csena:1; + uint64_t int_ena:1; + uint64_t lsbfirst:1; + uint64_t wireor:1; + uint64_t clk_cont:1; + uint64_t idlelo:1; + uint64_t enable:1; +#else + uint64_t enable:1; + uint64_t idlelo:1; + uint64_t clk_cont:1; + uint64_t wireor:1; + uint64_t lsbfirst:1; + uint64_t int_ena:1; + uint64_t csena:1; + uint64_t cshi:1; + uint64_t idleclks:2; + uint64_t tritx:1; + uint64_t reserved_11_15:5; + uint64_t clkdiv:13; + uint64_t reserved_29_63:35; +#endif + } cn31xx; + struct cvmx_mpi_cfg_cn30xx cn50xx; + struct cvmx_mpi_cfg_cn61xx { +#ifdef __BIG_ENDIAN_BITFIELD + uint64_t reserved_29_63:35; + uint64_t clkdiv:13; + uint64_t reserved_14_15:2; + uint64_t csena1:1; + uint64_t csena0:1; + uint64_t cslate:1; + uint64_t tritx:1; + uint64_t idleclks:2; + uint64_t cshi:1; + uint64_t reserved_6_6:1; + uint64_t int_ena:1; + uint64_t lsbfirst:1; + uint64_t wireor:1; + uint64_t clk_cont:1; + uint64_t idlelo:1; + uint64_t enable:1; +#else + uint64_t enable:1; + uint64_t idlelo:1; + uint64_t clk_cont:1; + uint64_t wireor:1; + uint64_t lsbfirst:1; + uint64_t int_ena:1; + uint64_t reserved_6_6:1; + uint64_t cshi:1; + uint64_t idleclks:2; + uint64_t tritx:1; + uint64_t cslate:1; + uint64_t csena0:1; + uint64_t csena1:1; + uint64_t reserved_14_15:2; + uint64_t clkdiv:13; + uint64_t reserved_29_63:35; +#endif + } cn61xx; + struct cvmx_mpi_cfg_cn66xx { +#ifdef __BIG_ENDIAN_BITFIELD + uint64_t reserved_29_63:35; + uint64_t clkdiv:13; + uint64_t csena3:1; + uint64_t csena2:1; + uint64_t reserved_12_13:2; + uint64_t cslate:1; + uint64_t tritx:1; + uint64_t idleclks:2; + uint64_t cshi:1; + uint64_t reserved_6_6:1; + uint64_t int_ena:1; + uint64_t lsbfirst:1; + uint64_t wireor:1; + uint64_t clk_cont:1; + uint64_t idlelo:1; + uint64_t enable:1; +#else + uint64_t enable:1; + uint64_t idlelo:1; + uint64_t clk_cont:1; + uint64_t wireor:1; + uint64_t lsbfirst:1; + uint64_t int_ena:1; + uint64_t reserved_6_6:1; + uint64_t cshi:1; + uint64_t idleclks:2; + uint64_t tritx:1; + uint64_t cslate:1; + uint64_t reserved_12_13:2; + uint64_t csena2:1; + uint64_t csena3:1; + uint64_t clkdiv:13; + uint64_t reserved_29_63:35; +#endif + } cn66xx; + struct cvmx_mpi_cfg_cn61xx cnf71xx; +}; + +union cvmx_mpi_datx { + uint64_t u64; + struct cvmx_mpi_datx_s { +#ifdef __BIG_ENDIAN_BITFIELD + uint64_t reserved_8_63:56; + uint64_t data:8; +#else + uint64_t data:8; + uint64_t reserved_8_63:56; +#endif + } s; + struct cvmx_mpi_datx_s cn30xx; + struct cvmx_mpi_datx_s cn31xx; + struct cvmx_mpi_datx_s cn50xx; + struct cvmx_mpi_datx_s cn61xx; + struct cvmx_mpi_datx_s cn66xx; + struct cvmx_mpi_datx_s cnf71xx; +}; + +union cvmx_mpi_sts { + uint64_t u64; + struct cvmx_mpi_sts_s { +#ifdef __BIG_ENDIAN_BITFIELD + uint64_t reserved_13_63:51; + uint64_t rxnum:5; + uint64_t reserved_1_7:7; + uint64_t busy:1; +#else + uint64_t busy:1; + uint64_t reserved_1_7:7; + uint64_t rxnum:5; + uint64_t reserved_13_63:51; +#endif + } s; + struct cvmx_mpi_sts_s cn30xx; + struct cvmx_mpi_sts_s cn31xx; + struct cvmx_mpi_sts_s cn50xx; + struct cvmx_mpi_sts_s cn61xx; + struct cvmx_mpi_sts_s cn66xx; + struct cvmx_mpi_sts_s cnf71xx; +}; + +union cvmx_mpi_tx { + uint64_t u64; + struct cvmx_mpi_tx_s { +#ifdef __BIG_ENDIAN_BITFIELD + uint64_t reserved_22_63:42; + uint64_t csid:2; + uint64_t reserved_17_19:3; + uint64_t leavecs:1; + uint64_t reserved_13_15:3; + uint64_t txnum:5; + uint64_t reserved_5_7:3; + uint64_t totnum:5; +#else + uint64_t totnum:5; + uint64_t reserved_5_7:3; + uint64_t txnum:5; + uint64_t reserved_13_15:3; + uint64_t leavecs:1; + uint64_t reserved_17_19:3; + uint64_t csid:2; + uint64_t reserved_22_63:42; +#endif + } s; + struct cvmx_mpi_tx_cn30xx { +#ifdef __BIG_ENDIAN_BITFIELD + uint64_t reserved_17_63:47; + uint64_t leavecs:1; + uint64_t reserved_13_15:3; + uint64_t txnum:5; + uint64_t reserved_5_7:3; + uint64_t totnum:5; +#else + uint64_t totnum:5; + uint64_t reserved_5_7:3; + uint64_t txnum:5; + uint64_t reserved_13_15:3; + uint64_t leavecs:1; + uint64_t reserved_17_63:47; +#endif + } cn30xx; + struct cvmx_mpi_tx_cn30xx cn31xx; + struct cvmx_mpi_tx_cn30xx cn50xx; + struct cvmx_mpi_tx_cn61xx { +#ifdef __BIG_ENDIAN_BITFIELD + uint64_t reserved_21_63:43; + uint64_t csid:1; + uint64_t reserved_17_19:3; + uint64_t leavecs:1; + uint64_t reserved_13_15:3; + uint64_t txnum:5; + uint64_t reserved_5_7:3; + uint64_t totnum:5; +#else + uint64_t totnum:5; + uint64_t reserved_5_7:3; + uint64_t txnum:5; + uint64_t reserved_13_15:3; + uint64_t leavecs:1; + uint64_t reserved_17_19:3; + uint64_t csid:1; + uint64_t reserved_21_63:43; +#endif + } cn61xx; + struct cvmx_mpi_tx_s cn66xx; + struct cvmx_mpi_tx_cn61xx cnf71xx; +}; + +#endif /* __SPI_CAVIUM_H */ diff --git a/drivers/spi/spi-clps711x.c b/drivers/spi/spi-clps711x.c new file mode 100644 index 000000000..5e900f228 --- /dev/null +++ b/drivers/spi/spi-clps711x.c @@ -0,0 +1,172 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * CLPS711X SPI bus driver + * + * Copyright (C) 2012-2016 Alexander Shiyan <shc_work@mail.ru> + */ + +#include <linux/io.h> +#include <linux/clk.h> +#include <linux/gpio/consumer.h> +#include <linux/module.h> +#include <linux/interrupt.h> +#include <linux/platform_device.h> +#include <linux/regmap.h> +#include <linux/mfd/syscon.h> +#include <linux/mfd/syscon/clps711x.h> +#include <linux/spi/spi.h> + +#define DRIVER_NAME "clps711x-spi" + +#define SYNCIO_FRMLEN(x) ((x) << 8) +#define SYNCIO_TXFRMEN (1 << 14) + +struct spi_clps711x_data { + void __iomem *syncio; + struct regmap *syscon; + struct clk *spi_clk; + + u8 *tx_buf; + u8 *rx_buf; + unsigned int bpw; + int len; +}; + +static int spi_clps711x_prepare_message(struct spi_master *master, + struct spi_message *msg) +{ + struct spi_clps711x_data *hw = spi_master_get_devdata(master); + struct spi_device *spi = msg->spi; + + /* Setup mode for transfer */ + return regmap_update_bits(hw->syscon, SYSCON_OFFSET, SYSCON3_ADCCKNSEN, + (spi->mode & SPI_CPHA) ? + SYSCON3_ADCCKNSEN : 0); +} + +static int spi_clps711x_transfer_one(struct spi_master *master, + struct spi_device *spi, + struct spi_transfer *xfer) +{ + struct spi_clps711x_data *hw = spi_master_get_devdata(master); + u8 data; + + clk_set_rate(hw->spi_clk, xfer->speed_hz ? : spi->max_speed_hz); + + hw->len = xfer->len; + hw->bpw = xfer->bits_per_word; + hw->tx_buf = (u8 *)xfer->tx_buf; + hw->rx_buf = (u8 *)xfer->rx_buf; + + /* Initiate transfer */ + data = hw->tx_buf ? *hw->tx_buf++ : 0; + writel(data | SYNCIO_FRMLEN(hw->bpw) | SYNCIO_TXFRMEN, hw->syncio); + + return 1; +} + +static irqreturn_t spi_clps711x_isr(int irq, void *dev_id) +{ + struct spi_master *master = dev_id; + struct spi_clps711x_data *hw = spi_master_get_devdata(master); + u8 data; + + /* Handle RX */ + data = readb(hw->syncio); + if (hw->rx_buf) + *hw->rx_buf++ = data; + + /* Handle TX */ + if (--hw->len > 0) { + data = hw->tx_buf ? *hw->tx_buf++ : 0; + writel(data | SYNCIO_FRMLEN(hw->bpw) | SYNCIO_TXFRMEN, + hw->syncio); + } else + spi_finalize_current_transfer(master); + + return IRQ_HANDLED; +} + +static int spi_clps711x_probe(struct platform_device *pdev) +{ + struct spi_clps711x_data *hw; + struct spi_master *master; + int irq, ret; + + irq = platform_get_irq(pdev, 0); + if (irq < 0) + return irq; + + master = spi_alloc_master(&pdev->dev, sizeof(*hw)); + if (!master) + return -ENOMEM; + + master->use_gpio_descriptors = true; + master->bus_num = -1; + master->mode_bits = SPI_CPHA | SPI_CS_HIGH; + master->bits_per_word_mask = SPI_BPW_RANGE_MASK(1, 8); + master->dev.of_node = pdev->dev.of_node; + master->prepare_message = spi_clps711x_prepare_message; + master->transfer_one = spi_clps711x_transfer_one; + + hw = spi_master_get_devdata(master); + + hw->spi_clk = devm_clk_get(&pdev->dev, NULL); + if (IS_ERR(hw->spi_clk)) { + ret = PTR_ERR(hw->spi_clk); + goto err_out; + } + + hw->syscon = + syscon_regmap_lookup_by_compatible("cirrus,ep7209-syscon3"); + if (IS_ERR(hw->syscon)) { + ret = PTR_ERR(hw->syscon); + goto err_out; + } + + hw->syncio = devm_platform_ioremap_resource(pdev, 0); + if (IS_ERR(hw->syncio)) { + ret = PTR_ERR(hw->syncio); + goto err_out; + } + + /* Disable extended mode due hardware problems */ + regmap_update_bits(hw->syscon, SYSCON_OFFSET, SYSCON3_ADCCON, 0); + + /* Clear possible pending interrupt */ + readl(hw->syncio); + + ret = devm_request_irq(&pdev->dev, irq, spi_clps711x_isr, 0, + dev_name(&pdev->dev), master); + if (ret) + goto err_out; + + ret = devm_spi_register_master(&pdev->dev, master); + if (!ret) + return 0; + +err_out: + spi_master_put(master); + + return ret; +} + +static const struct of_device_id clps711x_spi_dt_ids[] = { + { .compatible = "cirrus,ep7209-spi", }, + { } +}; +MODULE_DEVICE_TABLE(of, clps711x_spi_dt_ids); + +static struct platform_driver clps711x_spi_driver = { + .driver = { + .name = DRIVER_NAME, + .of_match_table = clps711x_spi_dt_ids, + }, + .probe = spi_clps711x_probe, +}; +module_platform_driver(clps711x_spi_driver); + +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Alexander Shiyan <shc_work@mail.ru>"); +MODULE_DESCRIPTION("CLPS711X SPI bus driver"); +MODULE_ALIAS("platform:" DRIVER_NAME); diff --git a/drivers/spi/spi-coldfire-qspi.c b/drivers/spi/spi-coldfire-qspi.c new file mode 100644 index 000000000..263ce9047 --- /dev/null +++ b/drivers/spi/spi-coldfire-qspi.c @@ -0,0 +1,519 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Freescale/Motorola Coldfire Queued SPI driver + * + * Copyright 2010 Steven King <sfking@fdwdc.com> +*/ + +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/interrupt.h> +#include <linux/errno.h> +#include <linux/platform_device.h> +#include <linux/sched.h> +#include <linux/delay.h> +#include <linux/io.h> +#include <linux/clk.h> +#include <linux/err.h> +#include <linux/spi/spi.h> +#include <linux/pm_runtime.h> + +#include <asm/coldfire.h> +#include <asm/mcfsim.h> +#include <asm/mcfqspi.h> + +#define DRIVER_NAME "mcfqspi" + +#define MCFQSPI_BUSCLK (MCF_BUSCLK / 2) + +#define MCFQSPI_QMR 0x00 +#define MCFQSPI_QMR_MSTR 0x8000 +#define MCFQSPI_QMR_CPOL 0x0200 +#define MCFQSPI_QMR_CPHA 0x0100 +#define MCFQSPI_QDLYR 0x04 +#define MCFQSPI_QDLYR_SPE 0x8000 +#define MCFQSPI_QWR 0x08 +#define MCFQSPI_QWR_HALT 0x8000 +#define MCFQSPI_QWR_WREN 0x4000 +#define MCFQSPI_QWR_CSIV 0x1000 +#define MCFQSPI_QIR 0x0C +#define MCFQSPI_QIR_WCEFB 0x8000 +#define MCFQSPI_QIR_ABRTB 0x4000 +#define MCFQSPI_QIR_ABRTL 0x1000 +#define MCFQSPI_QIR_WCEFE 0x0800 +#define MCFQSPI_QIR_ABRTE 0x0400 +#define MCFQSPI_QIR_SPIFE 0x0100 +#define MCFQSPI_QIR_WCEF 0x0008 +#define MCFQSPI_QIR_ABRT 0x0004 +#define MCFQSPI_QIR_SPIF 0x0001 +#define MCFQSPI_QAR 0x010 +#define MCFQSPI_QAR_TXBUF 0x00 +#define MCFQSPI_QAR_RXBUF 0x10 +#define MCFQSPI_QAR_CMDBUF 0x20 +#define MCFQSPI_QDR 0x014 +#define MCFQSPI_QCR 0x014 +#define MCFQSPI_QCR_CONT 0x8000 +#define MCFQSPI_QCR_BITSE 0x4000 +#define MCFQSPI_QCR_DT 0x2000 + +struct mcfqspi { + void __iomem *iobase; + int irq; + struct clk *clk; + struct mcfqspi_cs_control *cs_control; + + wait_queue_head_t waitq; +}; + +static void mcfqspi_wr_qmr(struct mcfqspi *mcfqspi, u16 val) +{ + writew(val, mcfqspi->iobase + MCFQSPI_QMR); +} + +static void mcfqspi_wr_qdlyr(struct mcfqspi *mcfqspi, u16 val) +{ + writew(val, mcfqspi->iobase + MCFQSPI_QDLYR); +} + +static u16 mcfqspi_rd_qdlyr(struct mcfqspi *mcfqspi) +{ + return readw(mcfqspi->iobase + MCFQSPI_QDLYR); +} + +static void mcfqspi_wr_qwr(struct mcfqspi *mcfqspi, u16 val) +{ + writew(val, mcfqspi->iobase + MCFQSPI_QWR); +} + +static void mcfqspi_wr_qir(struct mcfqspi *mcfqspi, u16 val) +{ + writew(val, mcfqspi->iobase + MCFQSPI_QIR); +} + +static void mcfqspi_wr_qar(struct mcfqspi *mcfqspi, u16 val) +{ + writew(val, mcfqspi->iobase + MCFQSPI_QAR); +} + +static void mcfqspi_wr_qdr(struct mcfqspi *mcfqspi, u16 val) +{ + writew(val, mcfqspi->iobase + MCFQSPI_QDR); +} + +static u16 mcfqspi_rd_qdr(struct mcfqspi *mcfqspi) +{ + return readw(mcfqspi->iobase + MCFQSPI_QDR); +} + +static void mcfqspi_cs_select(struct mcfqspi *mcfqspi, u8 chip_select, + bool cs_high) +{ + mcfqspi->cs_control->select(mcfqspi->cs_control, chip_select, cs_high); +} + +static void mcfqspi_cs_deselect(struct mcfqspi *mcfqspi, u8 chip_select, + bool cs_high) +{ + mcfqspi->cs_control->deselect(mcfqspi->cs_control, chip_select, cs_high); +} + +static int mcfqspi_cs_setup(struct mcfqspi *mcfqspi) +{ + return (mcfqspi->cs_control->setup) ? + mcfqspi->cs_control->setup(mcfqspi->cs_control) : 0; +} + +static void mcfqspi_cs_teardown(struct mcfqspi *mcfqspi) +{ + if (mcfqspi->cs_control->teardown) + mcfqspi->cs_control->teardown(mcfqspi->cs_control); +} + +static u8 mcfqspi_qmr_baud(u32 speed_hz) +{ + return clamp((MCFQSPI_BUSCLK + speed_hz - 1) / speed_hz, 2u, 255u); +} + +static bool mcfqspi_qdlyr_spe(struct mcfqspi *mcfqspi) +{ + return mcfqspi_rd_qdlyr(mcfqspi) & MCFQSPI_QDLYR_SPE; +} + +static irqreturn_t mcfqspi_irq_handler(int this_irq, void *dev_id) +{ + struct mcfqspi *mcfqspi = dev_id; + + /* clear interrupt */ + mcfqspi_wr_qir(mcfqspi, MCFQSPI_QIR_SPIFE | MCFQSPI_QIR_SPIF); + wake_up(&mcfqspi->waitq); + + return IRQ_HANDLED; +} + +static void mcfqspi_transfer_msg8(struct mcfqspi *mcfqspi, unsigned count, + const u8 *txbuf, u8 *rxbuf) +{ + unsigned i, n, offset = 0; + + n = min(count, 16u); + + mcfqspi_wr_qar(mcfqspi, MCFQSPI_QAR_CMDBUF); + for (i = 0; i < n; ++i) + mcfqspi_wr_qdr(mcfqspi, MCFQSPI_QCR_BITSE); + + mcfqspi_wr_qar(mcfqspi, MCFQSPI_QAR_TXBUF); + if (txbuf) + for (i = 0; i < n; ++i) + mcfqspi_wr_qdr(mcfqspi, *txbuf++); + else + for (i = 0; i < count; ++i) + mcfqspi_wr_qdr(mcfqspi, 0); + + count -= n; + if (count) { + u16 qwr = 0xf08; + mcfqspi_wr_qwr(mcfqspi, 0x700); + mcfqspi_wr_qdlyr(mcfqspi, MCFQSPI_QDLYR_SPE); + + do { + wait_event(mcfqspi->waitq, !mcfqspi_qdlyr_spe(mcfqspi)); + mcfqspi_wr_qwr(mcfqspi, qwr); + mcfqspi_wr_qdlyr(mcfqspi, MCFQSPI_QDLYR_SPE); + if (rxbuf) { + mcfqspi_wr_qar(mcfqspi, + MCFQSPI_QAR_RXBUF + offset); + for (i = 0; i < 8; ++i) + *rxbuf++ = mcfqspi_rd_qdr(mcfqspi); + } + n = min(count, 8u); + if (txbuf) { + mcfqspi_wr_qar(mcfqspi, + MCFQSPI_QAR_TXBUF + offset); + for (i = 0; i < n; ++i) + mcfqspi_wr_qdr(mcfqspi, *txbuf++); + } + qwr = (offset ? 0x808 : 0) + ((n - 1) << 8); + offset ^= 8; + count -= n; + } while (count); + wait_event(mcfqspi->waitq, !mcfqspi_qdlyr_spe(mcfqspi)); + mcfqspi_wr_qwr(mcfqspi, qwr); + mcfqspi_wr_qdlyr(mcfqspi, MCFQSPI_QDLYR_SPE); + if (rxbuf) { + mcfqspi_wr_qar(mcfqspi, MCFQSPI_QAR_RXBUF + offset); + for (i = 0; i < 8; ++i) + *rxbuf++ = mcfqspi_rd_qdr(mcfqspi); + offset ^= 8; + } + } else { + mcfqspi_wr_qwr(mcfqspi, (n - 1) << 8); + mcfqspi_wr_qdlyr(mcfqspi, MCFQSPI_QDLYR_SPE); + } + wait_event(mcfqspi->waitq, !mcfqspi_qdlyr_spe(mcfqspi)); + if (rxbuf) { + mcfqspi_wr_qar(mcfqspi, MCFQSPI_QAR_RXBUF + offset); + for (i = 0; i < n; ++i) + *rxbuf++ = mcfqspi_rd_qdr(mcfqspi); + } +} + +static void mcfqspi_transfer_msg16(struct mcfqspi *mcfqspi, unsigned count, + const u16 *txbuf, u16 *rxbuf) +{ + unsigned i, n, offset = 0; + + n = min(count, 16u); + + mcfqspi_wr_qar(mcfqspi, MCFQSPI_QAR_CMDBUF); + for (i = 0; i < n; ++i) + mcfqspi_wr_qdr(mcfqspi, MCFQSPI_QCR_BITSE); + + mcfqspi_wr_qar(mcfqspi, MCFQSPI_QAR_TXBUF); + if (txbuf) + for (i = 0; i < n; ++i) + mcfqspi_wr_qdr(mcfqspi, *txbuf++); + else + for (i = 0; i < count; ++i) + mcfqspi_wr_qdr(mcfqspi, 0); + + count -= n; + if (count) { + u16 qwr = 0xf08; + mcfqspi_wr_qwr(mcfqspi, 0x700); + mcfqspi_wr_qdlyr(mcfqspi, MCFQSPI_QDLYR_SPE); + + do { + wait_event(mcfqspi->waitq, !mcfqspi_qdlyr_spe(mcfqspi)); + mcfqspi_wr_qwr(mcfqspi, qwr); + mcfqspi_wr_qdlyr(mcfqspi, MCFQSPI_QDLYR_SPE); + if (rxbuf) { + mcfqspi_wr_qar(mcfqspi, + MCFQSPI_QAR_RXBUF + offset); + for (i = 0; i < 8; ++i) + *rxbuf++ = mcfqspi_rd_qdr(mcfqspi); + } + n = min(count, 8u); + if (txbuf) { + mcfqspi_wr_qar(mcfqspi, + MCFQSPI_QAR_TXBUF + offset); + for (i = 0; i < n; ++i) + mcfqspi_wr_qdr(mcfqspi, *txbuf++); + } + qwr = (offset ? 0x808 : 0x000) + ((n - 1) << 8); + offset ^= 8; + count -= n; + } while (count); + wait_event(mcfqspi->waitq, !mcfqspi_qdlyr_spe(mcfqspi)); + mcfqspi_wr_qwr(mcfqspi, qwr); + mcfqspi_wr_qdlyr(mcfqspi, MCFQSPI_QDLYR_SPE); + if (rxbuf) { + mcfqspi_wr_qar(mcfqspi, MCFQSPI_QAR_RXBUF + offset); + for (i = 0; i < 8; ++i) + *rxbuf++ = mcfqspi_rd_qdr(mcfqspi); + offset ^= 8; + } + } else { + mcfqspi_wr_qwr(mcfqspi, (n - 1) << 8); + mcfqspi_wr_qdlyr(mcfqspi, MCFQSPI_QDLYR_SPE); + } + wait_event(mcfqspi->waitq, !mcfqspi_qdlyr_spe(mcfqspi)); + if (rxbuf) { + mcfqspi_wr_qar(mcfqspi, MCFQSPI_QAR_RXBUF + offset); + for (i = 0; i < n; ++i) + *rxbuf++ = mcfqspi_rd_qdr(mcfqspi); + } +} + +static void mcfqspi_set_cs(struct spi_device *spi, bool enable) +{ + struct mcfqspi *mcfqspi = spi_master_get_devdata(spi->master); + bool cs_high = spi->mode & SPI_CS_HIGH; + + if (enable) + mcfqspi_cs_select(mcfqspi, spi->chip_select, cs_high); + else + mcfqspi_cs_deselect(mcfqspi, spi->chip_select, cs_high); +} + +static int mcfqspi_transfer_one(struct spi_master *master, + struct spi_device *spi, + struct spi_transfer *t) +{ + struct mcfqspi *mcfqspi = spi_master_get_devdata(master); + u16 qmr = MCFQSPI_QMR_MSTR; + + qmr |= t->bits_per_word << 10; + if (spi->mode & SPI_CPHA) + qmr |= MCFQSPI_QMR_CPHA; + if (spi->mode & SPI_CPOL) + qmr |= MCFQSPI_QMR_CPOL; + qmr |= mcfqspi_qmr_baud(t->speed_hz); + mcfqspi_wr_qmr(mcfqspi, qmr); + + mcfqspi_wr_qir(mcfqspi, MCFQSPI_QIR_SPIFE); + if (t->bits_per_word == 8) + mcfqspi_transfer_msg8(mcfqspi, t->len, t->tx_buf, t->rx_buf); + else + mcfqspi_transfer_msg16(mcfqspi, t->len / 2, t->tx_buf, + t->rx_buf); + mcfqspi_wr_qir(mcfqspi, 0); + + return 0; +} + +static int mcfqspi_setup(struct spi_device *spi) +{ + mcfqspi_cs_deselect(spi_master_get_devdata(spi->master), + spi->chip_select, spi->mode & SPI_CS_HIGH); + + dev_dbg(&spi->dev, + "bits per word %d, chip select %d, speed %d KHz\n", + spi->bits_per_word, spi->chip_select, + (MCFQSPI_BUSCLK / mcfqspi_qmr_baud(spi->max_speed_hz)) + / 1000); + + return 0; +} + +static int mcfqspi_probe(struct platform_device *pdev) +{ + struct spi_master *master; + struct mcfqspi *mcfqspi; + struct mcfqspi_platform_data *pdata; + int status; + + pdata = dev_get_platdata(&pdev->dev); + if (!pdata) { + dev_dbg(&pdev->dev, "platform data is missing\n"); + return -ENOENT; + } + + if (!pdata->cs_control) { + dev_dbg(&pdev->dev, "pdata->cs_control is NULL\n"); + return -EINVAL; + } + + master = spi_alloc_master(&pdev->dev, sizeof(*mcfqspi)); + if (master == NULL) { + dev_dbg(&pdev->dev, "spi_alloc_master failed\n"); + return -ENOMEM; + } + + mcfqspi = spi_master_get_devdata(master); + + mcfqspi->iobase = devm_platform_ioremap_resource(pdev, 0); + if (IS_ERR(mcfqspi->iobase)) { + status = PTR_ERR(mcfqspi->iobase); + goto fail0; + } + + mcfqspi->irq = platform_get_irq(pdev, 0); + if (mcfqspi->irq < 0) { + dev_dbg(&pdev->dev, "platform_get_irq failed\n"); + status = -ENXIO; + goto fail0; + } + + status = devm_request_irq(&pdev->dev, mcfqspi->irq, mcfqspi_irq_handler, + 0, pdev->name, mcfqspi); + if (status) { + dev_dbg(&pdev->dev, "request_irq failed\n"); + goto fail0; + } + + mcfqspi->clk = devm_clk_get(&pdev->dev, "qspi_clk"); + if (IS_ERR(mcfqspi->clk)) { + dev_dbg(&pdev->dev, "clk_get failed\n"); + status = PTR_ERR(mcfqspi->clk); + goto fail0; + } + clk_prepare_enable(mcfqspi->clk); + + master->bus_num = pdata->bus_num; + master->num_chipselect = pdata->num_chipselect; + + mcfqspi->cs_control = pdata->cs_control; + status = mcfqspi_cs_setup(mcfqspi); + if (status) { + dev_dbg(&pdev->dev, "error initializing cs_control\n"); + goto fail1; + } + + init_waitqueue_head(&mcfqspi->waitq); + + master->mode_bits = SPI_CS_HIGH | SPI_CPOL | SPI_CPHA; + master->bits_per_word_mask = SPI_BPW_RANGE_MASK(8, 16); + master->setup = mcfqspi_setup; + master->set_cs = mcfqspi_set_cs; + master->transfer_one = mcfqspi_transfer_one; + master->auto_runtime_pm = true; + + platform_set_drvdata(pdev, master); + pm_runtime_enable(&pdev->dev); + + status = devm_spi_register_master(&pdev->dev, master); + if (status) { + dev_dbg(&pdev->dev, "spi_register_master failed\n"); + goto fail2; + } + + dev_info(&pdev->dev, "Coldfire QSPI bus driver\n"); + + return 0; + +fail2: + pm_runtime_disable(&pdev->dev); + mcfqspi_cs_teardown(mcfqspi); +fail1: + clk_disable_unprepare(mcfqspi->clk); +fail0: + spi_master_put(master); + + dev_dbg(&pdev->dev, "Coldfire QSPI probe failed\n"); + + return status; +} + +static int mcfqspi_remove(struct platform_device *pdev) +{ + struct spi_master *master = platform_get_drvdata(pdev); + struct mcfqspi *mcfqspi = spi_master_get_devdata(master); + + pm_runtime_disable(&pdev->dev); + /* disable the hardware (set the baud rate to 0) */ + mcfqspi_wr_qmr(mcfqspi, MCFQSPI_QMR_MSTR); + + mcfqspi_cs_teardown(mcfqspi); + clk_disable_unprepare(mcfqspi->clk); + + return 0; +} + +#ifdef CONFIG_PM_SLEEP +static int mcfqspi_suspend(struct device *dev) +{ + struct spi_master *master = dev_get_drvdata(dev); + struct mcfqspi *mcfqspi = spi_master_get_devdata(master); + int ret; + + ret = spi_master_suspend(master); + if (ret) + return ret; + + clk_disable(mcfqspi->clk); + + return 0; +} + +static int mcfqspi_resume(struct device *dev) +{ + struct spi_master *master = dev_get_drvdata(dev); + struct mcfqspi *mcfqspi = spi_master_get_devdata(master); + + clk_enable(mcfqspi->clk); + + return spi_master_resume(master); +} +#endif + +#ifdef CONFIG_PM +static int mcfqspi_runtime_suspend(struct device *dev) +{ + struct spi_master *master = dev_get_drvdata(dev); + struct mcfqspi *mcfqspi = spi_master_get_devdata(master); + + clk_disable(mcfqspi->clk); + + return 0; +} + +static int mcfqspi_runtime_resume(struct device *dev) +{ + struct spi_master *master = dev_get_drvdata(dev); + struct mcfqspi *mcfqspi = spi_master_get_devdata(master); + + clk_enable(mcfqspi->clk); + + return 0; +} +#endif + +static const struct dev_pm_ops mcfqspi_pm = { + SET_SYSTEM_SLEEP_PM_OPS(mcfqspi_suspend, mcfqspi_resume) + SET_RUNTIME_PM_OPS(mcfqspi_runtime_suspend, mcfqspi_runtime_resume, + NULL) +}; + +static struct platform_driver mcfqspi_driver = { + .driver.name = DRIVER_NAME, + .driver.owner = THIS_MODULE, + .driver.pm = &mcfqspi_pm, + .probe = mcfqspi_probe, + .remove = mcfqspi_remove, +}; +module_platform_driver(mcfqspi_driver); + +MODULE_AUTHOR("Steven King <sfking@fdwdc.com>"); +MODULE_DESCRIPTION("Coldfire QSPI Controller Driver"); +MODULE_LICENSE("GPL"); +MODULE_ALIAS("platform:" DRIVER_NAME); diff --git a/drivers/spi/spi-davinci.c b/drivers/spi/spi-davinci.c new file mode 100644 index 000000000..fda73221f --- /dev/null +++ b/drivers/spi/spi-davinci.c @@ -0,0 +1,1058 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Copyright (C) 2009 Texas Instruments. + * Copyright (C) 2010 EF Johnson Technologies + */ + +#include <linux/interrupt.h> +#include <linux/io.h> +#include <linux/gpio/consumer.h> +#include <linux/module.h> +#include <linux/delay.h> +#include <linux/platform_device.h> +#include <linux/err.h> +#include <linux/clk.h> +#include <linux/dmaengine.h> +#include <linux/dma-mapping.h> +#include <linux/of.h> +#include <linux/of_device.h> +#include <linux/spi/spi.h> +#include <linux/spi/spi_bitbang.h> +#include <linux/slab.h> + +#include <linux/platform_data/spi-davinci.h> + +#define CS_DEFAULT 0xFF + +#define SPIFMT_PHASE_MASK BIT(16) +#define SPIFMT_POLARITY_MASK BIT(17) +#define SPIFMT_DISTIMER_MASK BIT(18) +#define SPIFMT_SHIFTDIR_MASK BIT(20) +#define SPIFMT_WAITENA_MASK BIT(21) +#define SPIFMT_PARITYENA_MASK BIT(22) +#define SPIFMT_ODD_PARITY_MASK BIT(23) +#define SPIFMT_WDELAY_MASK 0x3f000000u +#define SPIFMT_WDELAY_SHIFT 24 +#define SPIFMT_PRESCALE_SHIFT 8 + +/* SPIPC0 */ +#define SPIPC0_DIFUN_MASK BIT(11) /* MISO */ +#define SPIPC0_DOFUN_MASK BIT(10) /* MOSI */ +#define SPIPC0_CLKFUN_MASK BIT(9) /* CLK */ +#define SPIPC0_SPIENA_MASK BIT(8) /* nREADY */ + +#define SPIINT_MASKALL 0x0101035F +#define SPIINT_MASKINT 0x0000015F +#define SPI_INTLVL_1 0x000001FF +#define SPI_INTLVL_0 0x00000000 + +/* SPIDAT1 (upper 16 bit defines) */ +#define SPIDAT1_CSHOLD_MASK BIT(12) +#define SPIDAT1_WDEL BIT(10) + +/* SPIGCR1 */ +#define SPIGCR1_CLKMOD_MASK BIT(1) +#define SPIGCR1_MASTER_MASK BIT(0) +#define SPIGCR1_POWERDOWN_MASK BIT(8) +#define SPIGCR1_LOOPBACK_MASK BIT(16) +#define SPIGCR1_SPIENA_MASK BIT(24) + +/* SPIBUF */ +#define SPIBUF_TXFULL_MASK BIT(29) +#define SPIBUF_RXEMPTY_MASK BIT(31) + +/* SPIDELAY */ +#define SPIDELAY_C2TDELAY_SHIFT 24 +#define SPIDELAY_C2TDELAY_MASK (0xFF << SPIDELAY_C2TDELAY_SHIFT) +#define SPIDELAY_T2CDELAY_SHIFT 16 +#define SPIDELAY_T2CDELAY_MASK (0xFF << SPIDELAY_T2CDELAY_SHIFT) +#define SPIDELAY_T2EDELAY_SHIFT 8 +#define SPIDELAY_T2EDELAY_MASK (0xFF << SPIDELAY_T2EDELAY_SHIFT) +#define SPIDELAY_C2EDELAY_SHIFT 0 +#define SPIDELAY_C2EDELAY_MASK 0xFF + +/* Error Masks */ +#define SPIFLG_DLEN_ERR_MASK BIT(0) +#define SPIFLG_TIMEOUT_MASK BIT(1) +#define SPIFLG_PARERR_MASK BIT(2) +#define SPIFLG_DESYNC_MASK BIT(3) +#define SPIFLG_BITERR_MASK BIT(4) +#define SPIFLG_OVRRUN_MASK BIT(6) +#define SPIFLG_BUF_INIT_ACTIVE_MASK BIT(24) +#define SPIFLG_ERROR_MASK (SPIFLG_DLEN_ERR_MASK \ + | SPIFLG_TIMEOUT_MASK | SPIFLG_PARERR_MASK \ + | SPIFLG_DESYNC_MASK | SPIFLG_BITERR_MASK \ + | SPIFLG_OVRRUN_MASK) + +#define SPIINT_DMA_REQ_EN BIT(16) + +/* SPI Controller registers */ +#define SPIGCR0 0x00 +#define SPIGCR1 0x04 +#define SPIINT 0x08 +#define SPILVL 0x0c +#define SPIFLG 0x10 +#define SPIPC0 0x14 +#define SPIDAT1 0x3c +#define SPIBUF 0x40 +#define SPIDELAY 0x48 +#define SPIDEF 0x4c +#define SPIFMT0 0x50 + +#define DMA_MIN_BYTES 16 + +/* SPI Controller driver's private data. */ +struct davinci_spi { + struct spi_bitbang bitbang; + struct clk *clk; + + u8 version; + resource_size_t pbase; + void __iomem *base; + u32 irq; + struct completion done; + + const void *tx; + void *rx; + int rcount; + int wcount; + + struct dma_chan *dma_rx; + struct dma_chan *dma_tx; + + struct davinci_spi_platform_data pdata; + + void (*get_rx)(u32 rx_data, struct davinci_spi *); + u32 (*get_tx)(struct davinci_spi *); + + u8 *bytes_per_word; + + u8 prescaler_limit; +}; + +static struct davinci_spi_config davinci_spi_default_cfg; + +static void davinci_spi_rx_buf_u8(u32 data, struct davinci_spi *dspi) +{ + if (dspi->rx) { + u8 *rx = dspi->rx; + *rx++ = (u8)data; + dspi->rx = rx; + } +} + +static void davinci_spi_rx_buf_u16(u32 data, struct davinci_spi *dspi) +{ + if (dspi->rx) { + u16 *rx = dspi->rx; + *rx++ = (u16)data; + dspi->rx = rx; + } +} + +static u32 davinci_spi_tx_buf_u8(struct davinci_spi *dspi) +{ + u32 data = 0; + + if (dspi->tx) { + const u8 *tx = dspi->tx; + + data = *tx++; + dspi->tx = tx; + } + return data; +} + +static u32 davinci_spi_tx_buf_u16(struct davinci_spi *dspi) +{ + u32 data = 0; + + if (dspi->tx) { + const u16 *tx = dspi->tx; + + data = *tx++; + dspi->tx = tx; + } + return data; +} + +static inline void set_io_bits(void __iomem *addr, u32 bits) +{ + u32 v = ioread32(addr); + + v |= bits; + iowrite32(v, addr); +} + +static inline void clear_io_bits(void __iomem *addr, u32 bits) +{ + u32 v = ioread32(addr); + + v &= ~bits; + iowrite32(v, addr); +} + +/* + * Interface to control the chip select signal + */ +static void davinci_spi_chipselect(struct spi_device *spi, int value) +{ + struct davinci_spi *dspi; + struct davinci_spi_config *spicfg = spi->controller_data; + u8 chip_sel = spi->chip_select; + u16 spidat1 = CS_DEFAULT; + + dspi = spi_master_get_devdata(spi->master); + + /* program delay transfers if tx_delay is non zero */ + if (spicfg && spicfg->wdelay) + spidat1 |= SPIDAT1_WDEL; + + /* + * Board specific chip select logic decides the polarity and cs + * line for the controller + */ + if (spi->cs_gpiod) { + if (value == BITBANG_CS_ACTIVE) + gpiod_set_value(spi->cs_gpiod, 1); + else + gpiod_set_value(spi->cs_gpiod, 0); + } else { + if (value == BITBANG_CS_ACTIVE) { + if (!(spi->mode & SPI_CS_WORD)) + spidat1 |= SPIDAT1_CSHOLD_MASK; + spidat1 &= ~(0x1 << chip_sel); + } + } + + iowrite16(spidat1, dspi->base + SPIDAT1 + 2); +} + +/** + * davinci_spi_get_prescale - Calculates the correct prescale value + * @dspi: the controller data + * @max_speed_hz: the maximum rate the SPI clock can run at + * + * This function calculates the prescale value that generates a clock rate + * less than or equal to the specified maximum. + * + * Returns: calculated prescale value for easy programming into SPI registers + * or negative error number if valid prescalar cannot be updated. + */ +static inline int davinci_spi_get_prescale(struct davinci_spi *dspi, + u32 max_speed_hz) +{ + int ret; + + /* Subtract 1 to match what will be programmed into SPI register. */ + ret = DIV_ROUND_UP(clk_get_rate(dspi->clk), max_speed_hz) - 1; + + if (ret < dspi->prescaler_limit || ret > 255) + return -EINVAL; + + return ret; +} + +/** + * davinci_spi_setup_transfer - This functions will determine transfer method + * @spi: spi device on which data transfer to be done + * @t: spi transfer in which transfer info is filled + * + * This function determines data transfer method (8/16/32 bit transfer). + * It will also set the SPI Clock Control register according to + * SPI slave device freq. + */ +static int davinci_spi_setup_transfer(struct spi_device *spi, + struct spi_transfer *t) +{ + + struct davinci_spi *dspi; + struct davinci_spi_config *spicfg; + u8 bits_per_word = 0; + u32 hz = 0, spifmt = 0; + int prescale; + + dspi = spi_master_get_devdata(spi->master); + spicfg = spi->controller_data; + if (!spicfg) + spicfg = &davinci_spi_default_cfg; + + if (t) { + bits_per_word = t->bits_per_word; + hz = t->speed_hz; + } + + /* if bits_per_word is not set then set it default */ + if (!bits_per_word) + bits_per_word = spi->bits_per_word; + + /* + * Assign function pointer to appropriate transfer method + * 8bit, 16bit or 32bit transfer + */ + if (bits_per_word <= 8) { + dspi->get_rx = davinci_spi_rx_buf_u8; + dspi->get_tx = davinci_spi_tx_buf_u8; + dspi->bytes_per_word[spi->chip_select] = 1; + } else { + dspi->get_rx = davinci_spi_rx_buf_u16; + dspi->get_tx = davinci_spi_tx_buf_u16; + dspi->bytes_per_word[spi->chip_select] = 2; + } + + if (!hz) + hz = spi->max_speed_hz; + + /* Set up SPIFMTn register, unique to this chipselect. */ + + prescale = davinci_spi_get_prescale(dspi, hz); + if (prescale < 0) + return prescale; + + spifmt = (prescale << SPIFMT_PRESCALE_SHIFT) | (bits_per_word & 0x1f); + + if (spi->mode & SPI_LSB_FIRST) + spifmt |= SPIFMT_SHIFTDIR_MASK; + + if (spi->mode & SPI_CPOL) + spifmt |= SPIFMT_POLARITY_MASK; + + if (!(spi->mode & SPI_CPHA)) + spifmt |= SPIFMT_PHASE_MASK; + + /* + * Assume wdelay is used only on SPI peripherals that has this field + * in SPIFMTn register and when it's configured from board file or DT. + */ + if (spicfg->wdelay) + spifmt |= ((spicfg->wdelay << SPIFMT_WDELAY_SHIFT) + & SPIFMT_WDELAY_MASK); + + /* + * Version 1 hardware supports two basic SPI modes: + * - Standard SPI mode uses 4 pins, with chipselect + * - 3 pin SPI is a 4 pin variant without CS (SPI_NO_CS) + * (distinct from SPI_3WIRE, with just one data wire; + * or similar variants without MOSI or without MISO) + * + * Version 2 hardware supports an optional handshaking signal, + * so it can support two more modes: + * - 5 pin SPI variant is standard SPI plus SPI_READY + * - 4 pin with enable is (SPI_READY | SPI_NO_CS) + */ + + if (dspi->version == SPI_VERSION_2) { + + u32 delay = 0; + + if (spicfg->odd_parity) + spifmt |= SPIFMT_ODD_PARITY_MASK; + + if (spicfg->parity_enable) + spifmt |= SPIFMT_PARITYENA_MASK; + + if (spicfg->timer_disable) { + spifmt |= SPIFMT_DISTIMER_MASK; + } else { + delay |= (spicfg->c2tdelay << SPIDELAY_C2TDELAY_SHIFT) + & SPIDELAY_C2TDELAY_MASK; + delay |= (spicfg->t2cdelay << SPIDELAY_T2CDELAY_SHIFT) + & SPIDELAY_T2CDELAY_MASK; + } + + if (spi->mode & SPI_READY) { + spifmt |= SPIFMT_WAITENA_MASK; + delay |= (spicfg->t2edelay << SPIDELAY_T2EDELAY_SHIFT) + & SPIDELAY_T2EDELAY_MASK; + delay |= (spicfg->c2edelay << SPIDELAY_C2EDELAY_SHIFT) + & SPIDELAY_C2EDELAY_MASK; + } + + iowrite32(delay, dspi->base + SPIDELAY); + } + + iowrite32(spifmt, dspi->base + SPIFMT0); + + return 0; +} + +static int davinci_spi_of_setup(struct spi_device *spi) +{ + struct davinci_spi_config *spicfg = spi->controller_data; + struct device_node *np = spi->dev.of_node; + struct davinci_spi *dspi = spi_master_get_devdata(spi->master); + u32 prop; + + if (spicfg == NULL && np) { + spicfg = kzalloc(sizeof(*spicfg), GFP_KERNEL); + if (!spicfg) + return -ENOMEM; + *spicfg = davinci_spi_default_cfg; + /* override with dt configured values */ + if (!of_property_read_u32(np, "ti,spi-wdelay", &prop)) + spicfg->wdelay = (u8)prop; + spi->controller_data = spicfg; + + if (dspi->dma_rx && dspi->dma_tx) + spicfg->io_type = SPI_IO_TYPE_DMA; + } + + return 0; +} + +/** + * davinci_spi_setup - This functions will set default transfer method + * @spi: spi device on which data transfer to be done + * + * This functions sets the default transfer method. + */ +static int davinci_spi_setup(struct spi_device *spi) +{ + struct davinci_spi *dspi; + struct device_node *np = spi->dev.of_node; + bool internal_cs = true; + + dspi = spi_master_get_devdata(spi->master); + + if (!(spi->mode & SPI_NO_CS)) { + if (np && spi->cs_gpiod) + internal_cs = false; + + if (internal_cs) + set_io_bits(dspi->base + SPIPC0, 1 << spi->chip_select); + } + + if (spi->mode & SPI_READY) + set_io_bits(dspi->base + SPIPC0, SPIPC0_SPIENA_MASK); + + if (spi->mode & SPI_LOOP) + set_io_bits(dspi->base + SPIGCR1, SPIGCR1_LOOPBACK_MASK); + else + clear_io_bits(dspi->base + SPIGCR1, SPIGCR1_LOOPBACK_MASK); + + return davinci_spi_of_setup(spi); +} + +static void davinci_spi_cleanup(struct spi_device *spi) +{ + struct davinci_spi_config *spicfg = spi->controller_data; + + spi->controller_data = NULL; + if (spi->dev.of_node) + kfree(spicfg); +} + +static bool davinci_spi_can_dma(struct spi_master *master, + struct spi_device *spi, + struct spi_transfer *xfer) +{ + struct davinci_spi_config *spicfg = spi->controller_data; + bool can_dma = false; + + if (spicfg) + can_dma = (spicfg->io_type == SPI_IO_TYPE_DMA) && + (xfer->len >= DMA_MIN_BYTES) && + !is_vmalloc_addr(xfer->rx_buf) && + !is_vmalloc_addr(xfer->tx_buf); + + return can_dma; +} + +static int davinci_spi_check_error(struct davinci_spi *dspi, int int_status) +{ + struct device *sdev = dspi->bitbang.master->dev.parent; + + if (int_status & SPIFLG_TIMEOUT_MASK) { + dev_err(sdev, "SPI Time-out Error\n"); + return -ETIMEDOUT; + } + if (int_status & SPIFLG_DESYNC_MASK) { + dev_err(sdev, "SPI Desynchronization Error\n"); + return -EIO; + } + if (int_status & SPIFLG_BITERR_MASK) { + dev_err(sdev, "SPI Bit error\n"); + return -EIO; + } + + if (dspi->version == SPI_VERSION_2) { + if (int_status & SPIFLG_DLEN_ERR_MASK) { + dev_err(sdev, "SPI Data Length Error\n"); + return -EIO; + } + if (int_status & SPIFLG_PARERR_MASK) { + dev_err(sdev, "SPI Parity Error\n"); + return -EIO; + } + if (int_status & SPIFLG_OVRRUN_MASK) { + dev_err(sdev, "SPI Data Overrun error\n"); + return -EIO; + } + if (int_status & SPIFLG_BUF_INIT_ACTIVE_MASK) { + dev_err(sdev, "SPI Buffer Init Active\n"); + return -EBUSY; + } + } + + return 0; +} + +/** + * davinci_spi_process_events - check for and handle any SPI controller events + * @dspi: the controller data + * + * This function will check the SPIFLG register and handle any events that are + * detected there + */ +static int davinci_spi_process_events(struct davinci_spi *dspi) +{ + u32 buf, status, errors = 0, spidat1; + + buf = ioread32(dspi->base + SPIBUF); + + if (dspi->rcount > 0 && !(buf & SPIBUF_RXEMPTY_MASK)) { + dspi->get_rx(buf & 0xFFFF, dspi); + dspi->rcount--; + } + + status = ioread32(dspi->base + SPIFLG); + + if (unlikely(status & SPIFLG_ERROR_MASK)) { + errors = status & SPIFLG_ERROR_MASK; + goto out; + } + + if (dspi->wcount > 0 && !(buf & SPIBUF_TXFULL_MASK)) { + spidat1 = ioread32(dspi->base + SPIDAT1); + dspi->wcount--; + spidat1 &= ~0xFFFF; + spidat1 |= 0xFFFF & dspi->get_tx(dspi); + iowrite32(spidat1, dspi->base + SPIDAT1); + } + +out: + return errors; +} + +static void davinci_spi_dma_rx_callback(void *data) +{ + struct davinci_spi *dspi = (struct davinci_spi *)data; + + dspi->rcount = 0; + + if (!dspi->wcount && !dspi->rcount) + complete(&dspi->done); +} + +static void davinci_spi_dma_tx_callback(void *data) +{ + struct davinci_spi *dspi = (struct davinci_spi *)data; + + dspi->wcount = 0; + + if (!dspi->wcount && !dspi->rcount) + complete(&dspi->done); +} + +/** + * davinci_spi_bufs - functions which will handle transfer data + * @spi: spi device on which data transfer to be done + * @t: spi transfer in which transfer info is filled + * + * This function will put data to be transferred into data register + * of SPI controller and then wait until the completion will be marked + * by the IRQ Handler. + */ +static int davinci_spi_bufs(struct spi_device *spi, struct spi_transfer *t) +{ + struct davinci_spi *dspi; + int data_type, ret = -ENOMEM; + u32 tx_data, spidat1; + u32 errors = 0; + struct davinci_spi_config *spicfg; + struct davinci_spi_platform_data *pdata; + + dspi = spi_master_get_devdata(spi->master); + pdata = &dspi->pdata; + spicfg = (struct davinci_spi_config *)spi->controller_data; + if (!spicfg) + spicfg = &davinci_spi_default_cfg; + + /* convert len to words based on bits_per_word */ + data_type = dspi->bytes_per_word[spi->chip_select]; + + dspi->tx = t->tx_buf; + dspi->rx = t->rx_buf; + dspi->wcount = t->len / data_type; + dspi->rcount = dspi->wcount; + + spidat1 = ioread32(dspi->base + SPIDAT1); + + clear_io_bits(dspi->base + SPIGCR1, SPIGCR1_POWERDOWN_MASK); + set_io_bits(dspi->base + SPIGCR1, SPIGCR1_SPIENA_MASK); + + reinit_completion(&dspi->done); + + if (!davinci_spi_can_dma(spi->master, spi, t)) { + if (spicfg->io_type != SPI_IO_TYPE_POLL) + set_io_bits(dspi->base + SPIINT, SPIINT_MASKINT); + /* start the transfer */ + dspi->wcount--; + tx_data = dspi->get_tx(dspi); + spidat1 &= 0xFFFF0000; + spidat1 |= tx_data & 0xFFFF; + iowrite32(spidat1, dspi->base + SPIDAT1); + } else { + struct dma_slave_config dma_rx_conf = { + .direction = DMA_DEV_TO_MEM, + .src_addr = (unsigned long)dspi->pbase + SPIBUF, + .src_addr_width = data_type, + .src_maxburst = 1, + }; + struct dma_slave_config dma_tx_conf = { + .direction = DMA_MEM_TO_DEV, + .dst_addr = (unsigned long)dspi->pbase + SPIDAT1, + .dst_addr_width = data_type, + .dst_maxburst = 1, + }; + struct dma_async_tx_descriptor *rxdesc; + struct dma_async_tx_descriptor *txdesc; + + dmaengine_slave_config(dspi->dma_rx, &dma_rx_conf); + dmaengine_slave_config(dspi->dma_tx, &dma_tx_conf); + + rxdesc = dmaengine_prep_slave_sg(dspi->dma_rx, + t->rx_sg.sgl, t->rx_sg.nents, DMA_DEV_TO_MEM, + DMA_PREP_INTERRUPT | DMA_CTRL_ACK); + if (!rxdesc) + goto err_desc; + + if (!t->tx_buf) { + /* To avoid errors when doing rx-only transfers with + * many SG entries (> 20), use the rx buffer as the + * dummy tx buffer so that dma reloads are done at the + * same time for rx and tx. + */ + t->tx_sg.sgl = t->rx_sg.sgl; + t->tx_sg.nents = t->rx_sg.nents; + } + + txdesc = dmaengine_prep_slave_sg(dspi->dma_tx, + t->tx_sg.sgl, t->tx_sg.nents, DMA_MEM_TO_DEV, + DMA_PREP_INTERRUPT | DMA_CTRL_ACK); + if (!txdesc) + goto err_desc; + + rxdesc->callback = davinci_spi_dma_rx_callback; + rxdesc->callback_param = (void *)dspi; + txdesc->callback = davinci_spi_dma_tx_callback; + txdesc->callback_param = (void *)dspi; + + if (pdata->cshold_bug) + iowrite16(spidat1 >> 16, dspi->base + SPIDAT1 + 2); + + dmaengine_submit(rxdesc); + dmaengine_submit(txdesc); + + dma_async_issue_pending(dspi->dma_rx); + dma_async_issue_pending(dspi->dma_tx); + + set_io_bits(dspi->base + SPIINT, SPIINT_DMA_REQ_EN); + } + + /* Wait for the transfer to complete */ + if (spicfg->io_type != SPI_IO_TYPE_POLL) { + if (wait_for_completion_timeout(&dspi->done, HZ) == 0) + errors = SPIFLG_TIMEOUT_MASK; + } else { + while (dspi->rcount > 0 || dspi->wcount > 0) { + errors = davinci_spi_process_events(dspi); + if (errors) + break; + cpu_relax(); + } + } + + clear_io_bits(dspi->base + SPIINT, SPIINT_MASKALL); + if (davinci_spi_can_dma(spi->master, spi, t)) + clear_io_bits(dspi->base + SPIINT, SPIINT_DMA_REQ_EN); + + clear_io_bits(dspi->base + SPIGCR1, SPIGCR1_SPIENA_MASK); + set_io_bits(dspi->base + SPIGCR1, SPIGCR1_POWERDOWN_MASK); + + /* + * Check for bit error, desync error,parity error,timeout error and + * receive overflow errors + */ + if (errors) { + ret = davinci_spi_check_error(dspi, errors); + WARN(!ret, "%s: error reported but no error found!\n", + dev_name(&spi->dev)); + return ret; + } + + if (dspi->rcount != 0 || dspi->wcount != 0) { + dev_err(&spi->dev, "SPI data transfer error\n"); + return -EIO; + } + + return t->len; + +err_desc: + return ret; +} + +/** + * dummy_thread_fn - dummy thread function + * @irq: IRQ number for this SPI Master + * @data: structure for SPI Master controller davinci_spi + * + * This is to satisfy the request_threaded_irq() API so that the irq + * handler is called in interrupt context. + */ +static irqreturn_t dummy_thread_fn(s32 irq, void *data) +{ + return IRQ_HANDLED; +} + +/** + * davinci_spi_irq - Interrupt handler for SPI Master Controller + * @irq: IRQ number for this SPI Master + * @data: structure for SPI Master controller davinci_spi + * + * ISR will determine that interrupt arrives either for READ or WRITE command. + * According to command it will do the appropriate action. It will check + * transfer length and if it is not zero then dispatch transfer command again. + * If transfer length is zero then it will indicate the COMPLETION so that + * davinci_spi_bufs function can go ahead. + */ +static irqreturn_t davinci_spi_irq(s32 irq, void *data) +{ + struct davinci_spi *dspi = data; + int status; + + status = davinci_spi_process_events(dspi); + if (unlikely(status != 0)) + clear_io_bits(dspi->base + SPIINT, SPIINT_MASKINT); + + if ((!dspi->rcount && !dspi->wcount) || status) + complete(&dspi->done); + + return IRQ_HANDLED; +} + +static int davinci_spi_request_dma(struct davinci_spi *dspi) +{ + struct device *sdev = dspi->bitbang.master->dev.parent; + + dspi->dma_rx = dma_request_chan(sdev, "rx"); + if (IS_ERR(dspi->dma_rx)) + return PTR_ERR(dspi->dma_rx); + + dspi->dma_tx = dma_request_chan(sdev, "tx"); + if (IS_ERR(dspi->dma_tx)) { + dma_release_channel(dspi->dma_rx); + return PTR_ERR(dspi->dma_tx); + } + + return 0; +} + +#if defined(CONFIG_OF) + +/* OF SPI data structure */ +struct davinci_spi_of_data { + u8 version; + u8 prescaler_limit; +}; + +static const struct davinci_spi_of_data dm6441_spi_data = { + .version = SPI_VERSION_1, + .prescaler_limit = 2, +}; + +static const struct davinci_spi_of_data da830_spi_data = { + .version = SPI_VERSION_2, + .prescaler_limit = 2, +}; + +static const struct davinci_spi_of_data keystone_spi_data = { + .version = SPI_VERSION_1, + .prescaler_limit = 0, +}; + +static const struct of_device_id davinci_spi_of_match[] = { + { + .compatible = "ti,dm6441-spi", + .data = &dm6441_spi_data, + }, + { + .compatible = "ti,da830-spi", + .data = &da830_spi_data, + }, + { + .compatible = "ti,keystone-spi", + .data = &keystone_spi_data, + }, + { }, +}; +MODULE_DEVICE_TABLE(of, davinci_spi_of_match); + +/** + * spi_davinci_get_pdata - Get platform data from DTS binding + * @pdev: ptr to platform data + * @dspi: ptr to driver data + * + * Parses and populates pdata in dspi from device tree bindings. + * + * NOTE: Not all platform data params are supported currently. + */ +static int spi_davinci_get_pdata(struct platform_device *pdev, + struct davinci_spi *dspi) +{ + struct device_node *node = pdev->dev.of_node; + struct davinci_spi_of_data *spi_data; + struct davinci_spi_platform_data *pdata; + unsigned int num_cs, intr_line = 0; + const struct of_device_id *match; + + pdata = &dspi->pdata; + + match = of_match_device(davinci_spi_of_match, &pdev->dev); + if (!match) + return -ENODEV; + + spi_data = (struct davinci_spi_of_data *)match->data; + + pdata->version = spi_data->version; + pdata->prescaler_limit = spi_data->prescaler_limit; + /* + * default num_cs is 1 and all chipsel are internal to the chip + * indicated by chip_sel being NULL or cs_gpios being NULL or + * set to -ENOENT. num-cs includes internal as well as gpios. + * indicated by chip_sel being NULL. GPIO based CS is not + * supported yet in DT bindings. + */ + num_cs = 1; + of_property_read_u32(node, "num-cs", &num_cs); + pdata->num_chipselect = num_cs; + of_property_read_u32(node, "ti,davinci-spi-intr-line", &intr_line); + pdata->intr_line = intr_line; + return 0; +} +#else +static int spi_davinci_get_pdata(struct platform_device *pdev, + struct davinci_spi *dspi) +{ + return -ENODEV; +} +#endif + +/** + * davinci_spi_probe - probe function for SPI Master Controller + * @pdev: platform_device structure which contains plateform specific data + * + * According to Linux Device Model this function will be invoked by Linux + * with platform_device struct which contains the device specific info. + * This function will map the SPI controller's memory, register IRQ, + * Reset SPI controller and setting its registers to default value. + * It will invoke spi_bitbang_start to create work queue so that client driver + * can register transfer method to work queue. + */ +static int davinci_spi_probe(struct platform_device *pdev) +{ + struct spi_master *master; + struct davinci_spi *dspi; + struct davinci_spi_platform_data *pdata; + struct resource *r; + int ret = 0; + u32 spipc0; + + master = spi_alloc_master(&pdev->dev, sizeof(struct davinci_spi)); + if (master == NULL) { + ret = -ENOMEM; + goto err; + } + + platform_set_drvdata(pdev, master); + + dspi = spi_master_get_devdata(master); + + if (dev_get_platdata(&pdev->dev)) { + pdata = dev_get_platdata(&pdev->dev); + dspi->pdata = *pdata; + } else { + /* update dspi pdata with that from the DT */ + ret = spi_davinci_get_pdata(pdev, dspi); + if (ret < 0) + goto free_master; + } + + /* pdata in dspi is now updated and point pdata to that */ + pdata = &dspi->pdata; + + dspi->bytes_per_word = devm_kcalloc(&pdev->dev, + pdata->num_chipselect, + sizeof(*dspi->bytes_per_word), + GFP_KERNEL); + if (dspi->bytes_per_word == NULL) { + ret = -ENOMEM; + goto free_master; + } + + r = platform_get_resource(pdev, IORESOURCE_MEM, 0); + if (r == NULL) { + ret = -ENOENT; + goto free_master; + } + + dspi->pbase = r->start; + + dspi->base = devm_ioremap_resource(&pdev->dev, r); + if (IS_ERR(dspi->base)) { + ret = PTR_ERR(dspi->base); + goto free_master; + } + + init_completion(&dspi->done); + + ret = platform_get_irq(pdev, 0); + if (ret == 0) + ret = -EINVAL; + if (ret < 0) + goto free_master; + dspi->irq = ret; + + ret = devm_request_threaded_irq(&pdev->dev, dspi->irq, davinci_spi_irq, + dummy_thread_fn, 0, dev_name(&pdev->dev), dspi); + if (ret) + goto free_master; + + dspi->bitbang.master = master; + + dspi->clk = devm_clk_get(&pdev->dev, NULL); + if (IS_ERR(dspi->clk)) { + ret = -ENODEV; + goto free_master; + } + ret = clk_prepare_enable(dspi->clk); + if (ret) + goto free_master; + + master->use_gpio_descriptors = true; + master->dev.of_node = pdev->dev.of_node; + master->bus_num = pdev->id; + master->num_chipselect = pdata->num_chipselect; + master->bits_per_word_mask = SPI_BPW_RANGE_MASK(2, 16); + master->flags = SPI_MASTER_MUST_RX | SPI_MASTER_GPIO_SS; + master->setup = davinci_spi_setup; + master->cleanup = davinci_spi_cleanup; + master->can_dma = davinci_spi_can_dma; + + dspi->bitbang.chipselect = davinci_spi_chipselect; + dspi->bitbang.setup_transfer = davinci_spi_setup_transfer; + dspi->prescaler_limit = pdata->prescaler_limit; + dspi->version = pdata->version; + + dspi->bitbang.flags = SPI_NO_CS | SPI_LSB_FIRST | SPI_LOOP | SPI_CS_WORD; + if (dspi->version == SPI_VERSION_2) + dspi->bitbang.flags |= SPI_READY; + + dspi->bitbang.txrx_bufs = davinci_spi_bufs; + + ret = davinci_spi_request_dma(dspi); + if (ret == -EPROBE_DEFER) { + goto free_clk; + } else if (ret) { + dev_info(&pdev->dev, "DMA is not supported (%d)\n", ret); + dspi->dma_rx = NULL; + dspi->dma_tx = NULL; + } + + dspi->get_rx = davinci_spi_rx_buf_u8; + dspi->get_tx = davinci_spi_tx_buf_u8; + + /* Reset In/OUT SPI module */ + iowrite32(0, dspi->base + SPIGCR0); + udelay(100); + iowrite32(1, dspi->base + SPIGCR0); + + /* Set up SPIPC0. CS and ENA init is done in davinci_spi_setup */ + spipc0 = SPIPC0_DIFUN_MASK | SPIPC0_DOFUN_MASK | SPIPC0_CLKFUN_MASK; + iowrite32(spipc0, dspi->base + SPIPC0); + + if (pdata->intr_line) + iowrite32(SPI_INTLVL_1, dspi->base + SPILVL); + else + iowrite32(SPI_INTLVL_0, dspi->base + SPILVL); + + iowrite32(CS_DEFAULT, dspi->base + SPIDEF); + + /* master mode default */ + set_io_bits(dspi->base + SPIGCR1, SPIGCR1_CLKMOD_MASK); + set_io_bits(dspi->base + SPIGCR1, SPIGCR1_MASTER_MASK); + set_io_bits(dspi->base + SPIGCR1, SPIGCR1_POWERDOWN_MASK); + + ret = spi_bitbang_start(&dspi->bitbang); + if (ret) + goto free_dma; + + dev_info(&pdev->dev, "Controller at 0x%p\n", dspi->base); + + return ret; + +free_dma: + if (dspi->dma_rx) { + dma_release_channel(dspi->dma_rx); + dma_release_channel(dspi->dma_tx); + } +free_clk: + clk_disable_unprepare(dspi->clk); +free_master: + spi_master_put(master); +err: + return ret; +} + +/** + * davinci_spi_remove - remove function for SPI Master Controller + * @pdev: platform_device structure which contains plateform specific data + * + * This function will do the reverse action of davinci_spi_probe function + * It will free the IRQ and SPI controller's memory region. + * It will also call spi_bitbang_stop to destroy the work queue which was + * created by spi_bitbang_start. + */ +static int davinci_spi_remove(struct platform_device *pdev) +{ + struct davinci_spi *dspi; + struct spi_master *master; + + master = platform_get_drvdata(pdev); + dspi = spi_master_get_devdata(master); + + spi_bitbang_stop(&dspi->bitbang); + + clk_disable_unprepare(dspi->clk); + + if (dspi->dma_rx) { + dma_release_channel(dspi->dma_rx); + dma_release_channel(dspi->dma_tx); + } + + spi_master_put(master); + return 0; +} + +static struct platform_driver davinci_spi_driver = { + .driver = { + .name = "spi_davinci", + .of_match_table = of_match_ptr(davinci_spi_of_match), + }, + .probe = davinci_spi_probe, + .remove = davinci_spi_remove, +}; +module_platform_driver(davinci_spi_driver); + +MODULE_DESCRIPTION("TI DaVinci SPI Master Controller Driver"); +MODULE_LICENSE("GPL"); diff --git a/drivers/spi/spi-dln2.c b/drivers/spi/spi-dln2.c new file mode 100644 index 000000000..9a4d942fa --- /dev/null +++ b/drivers/spi/spi-dln2.c @@ -0,0 +1,880 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Driver for the Diolan DLN-2 USB-SPI adapter + * + * Copyright (c) 2014 Intel Corporation + */ + +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/platform_device.h> +#include <linux/mfd/dln2.h> +#include <linux/spi/spi.h> +#include <linux/pm_runtime.h> +#include <asm/unaligned.h> + +#define DLN2_SPI_MODULE_ID 0x02 +#define DLN2_SPI_CMD(cmd) DLN2_CMD(cmd, DLN2_SPI_MODULE_ID) + +/* SPI commands */ +#define DLN2_SPI_GET_PORT_COUNT DLN2_SPI_CMD(0x00) +#define DLN2_SPI_ENABLE DLN2_SPI_CMD(0x11) +#define DLN2_SPI_DISABLE DLN2_SPI_CMD(0x12) +#define DLN2_SPI_IS_ENABLED DLN2_SPI_CMD(0x13) +#define DLN2_SPI_SET_MODE DLN2_SPI_CMD(0x14) +#define DLN2_SPI_GET_MODE DLN2_SPI_CMD(0x15) +#define DLN2_SPI_SET_FRAME_SIZE DLN2_SPI_CMD(0x16) +#define DLN2_SPI_GET_FRAME_SIZE DLN2_SPI_CMD(0x17) +#define DLN2_SPI_SET_FREQUENCY DLN2_SPI_CMD(0x18) +#define DLN2_SPI_GET_FREQUENCY DLN2_SPI_CMD(0x19) +#define DLN2_SPI_READ_WRITE DLN2_SPI_CMD(0x1A) +#define DLN2_SPI_READ DLN2_SPI_CMD(0x1B) +#define DLN2_SPI_WRITE DLN2_SPI_CMD(0x1C) +#define DLN2_SPI_SET_DELAY_BETWEEN_SS DLN2_SPI_CMD(0x20) +#define DLN2_SPI_GET_DELAY_BETWEEN_SS DLN2_SPI_CMD(0x21) +#define DLN2_SPI_SET_DELAY_AFTER_SS DLN2_SPI_CMD(0x22) +#define DLN2_SPI_GET_DELAY_AFTER_SS DLN2_SPI_CMD(0x23) +#define DLN2_SPI_SET_DELAY_BETWEEN_FRAMES DLN2_SPI_CMD(0x24) +#define DLN2_SPI_GET_DELAY_BETWEEN_FRAMES DLN2_SPI_CMD(0x25) +#define DLN2_SPI_SET_SS DLN2_SPI_CMD(0x26) +#define DLN2_SPI_GET_SS DLN2_SPI_CMD(0x27) +#define DLN2_SPI_RELEASE_SS DLN2_SPI_CMD(0x28) +#define DLN2_SPI_SS_VARIABLE_ENABLE DLN2_SPI_CMD(0x2B) +#define DLN2_SPI_SS_VARIABLE_DISABLE DLN2_SPI_CMD(0x2C) +#define DLN2_SPI_SS_VARIABLE_IS_ENABLED DLN2_SPI_CMD(0x2D) +#define DLN2_SPI_SS_AAT_ENABLE DLN2_SPI_CMD(0x2E) +#define DLN2_SPI_SS_AAT_DISABLE DLN2_SPI_CMD(0x2F) +#define DLN2_SPI_SS_AAT_IS_ENABLED DLN2_SPI_CMD(0x30) +#define DLN2_SPI_SS_BETWEEN_FRAMES_ENABLE DLN2_SPI_CMD(0x31) +#define DLN2_SPI_SS_BETWEEN_FRAMES_DISABLE DLN2_SPI_CMD(0x32) +#define DLN2_SPI_SS_BETWEEN_FRAMES_IS_ENABLED DLN2_SPI_CMD(0x33) +#define DLN2_SPI_SET_CPHA DLN2_SPI_CMD(0x34) +#define DLN2_SPI_GET_CPHA DLN2_SPI_CMD(0x35) +#define DLN2_SPI_SET_CPOL DLN2_SPI_CMD(0x36) +#define DLN2_SPI_GET_CPOL DLN2_SPI_CMD(0x37) +#define DLN2_SPI_SS_MULTI_ENABLE DLN2_SPI_CMD(0x38) +#define DLN2_SPI_SS_MULTI_DISABLE DLN2_SPI_CMD(0x39) +#define DLN2_SPI_SS_MULTI_IS_ENABLED DLN2_SPI_CMD(0x3A) +#define DLN2_SPI_GET_SUPPORTED_MODES DLN2_SPI_CMD(0x40) +#define DLN2_SPI_GET_SUPPORTED_CPHA_VALUES DLN2_SPI_CMD(0x41) +#define DLN2_SPI_GET_SUPPORTED_CPOL_VALUES DLN2_SPI_CMD(0x42) +#define DLN2_SPI_GET_SUPPORTED_FRAME_SIZES DLN2_SPI_CMD(0x43) +#define DLN2_SPI_GET_SS_COUNT DLN2_SPI_CMD(0x44) +#define DLN2_SPI_GET_MIN_FREQUENCY DLN2_SPI_CMD(0x45) +#define DLN2_SPI_GET_MAX_FREQUENCY DLN2_SPI_CMD(0x46) +#define DLN2_SPI_GET_MIN_DELAY_BETWEEN_SS DLN2_SPI_CMD(0x47) +#define DLN2_SPI_GET_MAX_DELAY_BETWEEN_SS DLN2_SPI_CMD(0x48) +#define DLN2_SPI_GET_MIN_DELAY_AFTER_SS DLN2_SPI_CMD(0x49) +#define DLN2_SPI_GET_MAX_DELAY_AFTER_SS DLN2_SPI_CMD(0x4A) +#define DLN2_SPI_GET_MIN_DELAY_BETWEEN_FRAMES DLN2_SPI_CMD(0x4B) +#define DLN2_SPI_GET_MAX_DELAY_BETWEEN_FRAMES DLN2_SPI_CMD(0x4C) + +#define DLN2_SPI_MAX_XFER_SIZE 256 +#define DLN2_SPI_BUF_SIZE (DLN2_SPI_MAX_XFER_SIZE + 16) +#define DLN2_SPI_ATTR_LEAVE_SS_LOW BIT(0) +#define DLN2_TRANSFERS_WAIT_COMPLETE 1 +#define DLN2_TRANSFERS_CANCEL 0 +#define DLN2_RPM_AUTOSUSPEND_TIMEOUT 2000 + +struct dln2_spi { + struct platform_device *pdev; + struct spi_master *master; + u8 port; + + /* + * This buffer will be used mainly for read/write operations. Since + * they're quite large, we cannot use the stack. Protection is not + * needed because all SPI communication is serialized by the SPI core. + */ + void *buf; + + u8 bpw; + u32 speed; + u16 mode; + u8 cs; +}; + +/* + * Enable/Disable SPI module. The disable command will wait for transfers to + * complete first. + */ +static int dln2_spi_enable(struct dln2_spi *dln2, bool enable) +{ + u16 cmd; + struct { + u8 port; + u8 wait_for_completion; + } tx; + unsigned len = sizeof(tx); + + tx.port = dln2->port; + + if (enable) { + cmd = DLN2_SPI_ENABLE; + len -= sizeof(tx.wait_for_completion); + } else { + tx.wait_for_completion = DLN2_TRANSFERS_WAIT_COMPLETE; + cmd = DLN2_SPI_DISABLE; + } + + return dln2_transfer_tx(dln2->pdev, cmd, &tx, len); +} + +/* + * Select/unselect multiple CS lines. The selected lines will be automatically + * toggled LOW/HIGH by the board firmware during transfers, provided they're + * enabled first. + * + * Ex: cs_mask = 0x03 -> CS0 & CS1 will be selected and the next WR/RD operation + * will toggle the lines LOW/HIGH automatically. + */ +static int dln2_spi_cs_set(struct dln2_spi *dln2, u8 cs_mask) +{ + struct { + u8 port; + u8 cs; + } tx; + + tx.port = dln2->port; + + /* + * According to Diolan docs, "a slave device can be selected by changing + * the corresponding bit value to 0". The rest must be set to 1. Hence + * the bitwise NOT in front. + */ + tx.cs = ~cs_mask; + + return dln2_transfer_tx(dln2->pdev, DLN2_SPI_SET_SS, &tx, sizeof(tx)); +} + +/* + * Select one CS line. The other lines will be un-selected. + */ +static int dln2_spi_cs_set_one(struct dln2_spi *dln2, u8 cs) +{ + return dln2_spi_cs_set(dln2, BIT(cs)); +} + +/* + * Enable/disable CS lines for usage. The module has to be disabled first. + */ +static int dln2_spi_cs_enable(struct dln2_spi *dln2, u8 cs_mask, bool enable) +{ + struct { + u8 port; + u8 cs; + } tx; + u16 cmd; + + tx.port = dln2->port; + tx.cs = cs_mask; + cmd = enable ? DLN2_SPI_SS_MULTI_ENABLE : DLN2_SPI_SS_MULTI_DISABLE; + + return dln2_transfer_tx(dln2->pdev, cmd, &tx, sizeof(tx)); +} + +static int dln2_spi_cs_enable_all(struct dln2_spi *dln2, bool enable) +{ + u8 cs_mask = GENMASK(dln2->master->num_chipselect - 1, 0); + + return dln2_spi_cs_enable(dln2, cs_mask, enable); +} + +static int dln2_spi_get_cs_num(struct dln2_spi *dln2, u16 *cs_num) +{ + int ret; + struct { + u8 port; + } tx; + struct { + __le16 cs_count; + } rx; + unsigned rx_len = sizeof(rx); + + tx.port = dln2->port; + ret = dln2_transfer(dln2->pdev, DLN2_SPI_GET_SS_COUNT, &tx, sizeof(tx), + &rx, &rx_len); + if (ret < 0) + return ret; + if (rx_len < sizeof(rx)) + return -EPROTO; + + *cs_num = le16_to_cpu(rx.cs_count); + + dev_dbg(&dln2->pdev->dev, "cs_num = %d\n", *cs_num); + + return 0; +} + +static int dln2_spi_get_speed(struct dln2_spi *dln2, u16 cmd, u32 *freq) +{ + int ret; + struct { + u8 port; + } tx; + struct { + __le32 speed; + } rx; + unsigned rx_len = sizeof(rx); + + tx.port = dln2->port; + + ret = dln2_transfer(dln2->pdev, cmd, &tx, sizeof(tx), &rx, &rx_len); + if (ret < 0) + return ret; + if (rx_len < sizeof(rx)) + return -EPROTO; + + *freq = le32_to_cpu(rx.speed); + + return 0; +} + +/* + * Get bus min/max frequencies. + */ +static int dln2_spi_get_speed_range(struct dln2_spi *dln2, u32 *fmin, u32 *fmax) +{ + int ret; + + ret = dln2_spi_get_speed(dln2, DLN2_SPI_GET_MIN_FREQUENCY, fmin); + if (ret < 0) + return ret; + + ret = dln2_spi_get_speed(dln2, DLN2_SPI_GET_MAX_FREQUENCY, fmax); + if (ret < 0) + return ret; + + dev_dbg(&dln2->pdev->dev, "freq_min = %d, freq_max = %d\n", + *fmin, *fmax); + + return 0; +} + +/* + * Set the bus speed. The module will automatically round down to the closest + * available frequency and returns it. The module has to be disabled first. + */ +static int dln2_spi_set_speed(struct dln2_spi *dln2, u32 speed) +{ + int ret; + struct { + u8 port; + __le32 speed; + } __packed tx; + struct { + __le32 speed; + } rx; + int rx_len = sizeof(rx); + + tx.port = dln2->port; + tx.speed = cpu_to_le32(speed); + + ret = dln2_transfer(dln2->pdev, DLN2_SPI_SET_FREQUENCY, &tx, sizeof(tx), + &rx, &rx_len); + if (ret < 0) + return ret; + if (rx_len < sizeof(rx)) + return -EPROTO; + + return 0; +} + +/* + * Change CPOL & CPHA. The module has to be disabled first. + */ +static int dln2_spi_set_mode(struct dln2_spi *dln2, u8 mode) +{ + struct { + u8 port; + u8 mode; + } tx; + + tx.port = dln2->port; + tx.mode = mode; + + return dln2_transfer_tx(dln2->pdev, DLN2_SPI_SET_MODE, &tx, sizeof(tx)); +} + +/* + * Change frame size. The module has to be disabled first. + */ +static int dln2_spi_set_bpw(struct dln2_spi *dln2, u8 bpw) +{ + struct { + u8 port; + u8 bpw; + } tx; + + tx.port = dln2->port; + tx.bpw = bpw; + + return dln2_transfer_tx(dln2->pdev, DLN2_SPI_SET_FRAME_SIZE, + &tx, sizeof(tx)); +} + +static int dln2_spi_get_supported_frame_sizes(struct dln2_spi *dln2, + u32 *bpw_mask) +{ + int ret; + struct { + u8 port; + } tx; + struct { + u8 count; + u8 frame_sizes[36]; + } *rx = dln2->buf; + unsigned rx_len = sizeof(*rx); + int i; + + tx.port = dln2->port; + + ret = dln2_transfer(dln2->pdev, DLN2_SPI_GET_SUPPORTED_FRAME_SIZES, + &tx, sizeof(tx), rx, &rx_len); + if (ret < 0) + return ret; + if (rx_len < sizeof(*rx)) + return -EPROTO; + if (rx->count > ARRAY_SIZE(rx->frame_sizes)) + return -EPROTO; + + *bpw_mask = 0; + for (i = 0; i < rx->count; i++) + *bpw_mask |= BIT(rx->frame_sizes[i] - 1); + + dev_dbg(&dln2->pdev->dev, "bpw_mask = 0x%X\n", *bpw_mask); + + return 0; +} + +/* + * Copy the data to DLN2 buffer and change the byte order to LE, requested by + * DLN2 module. SPI core makes sure that the data length is a multiple of word + * size. + */ +static int dln2_spi_copy_to_buf(u8 *dln2_buf, const u8 *src, u16 len, u8 bpw) +{ +#ifdef __LITTLE_ENDIAN + memcpy(dln2_buf, src, len); +#else + if (bpw <= 8) { + memcpy(dln2_buf, src, len); + } else if (bpw <= 16) { + __le16 *d = (__le16 *)dln2_buf; + u16 *s = (u16 *)src; + + len = len / 2; + while (len--) + *d++ = cpu_to_le16p(s++); + } else { + __le32 *d = (__le32 *)dln2_buf; + u32 *s = (u32 *)src; + + len = len / 4; + while (len--) + *d++ = cpu_to_le32p(s++); + } +#endif + + return 0; +} + +/* + * Copy the data from DLN2 buffer and convert to CPU byte order since the DLN2 + * buffer is LE ordered. SPI core makes sure that the data length is a multiple + * of word size. The RX dln2_buf is 2 byte aligned so, for BE, we have to make + * sure we avoid unaligned accesses for 32 bit case. + */ +static int dln2_spi_copy_from_buf(u8 *dest, const u8 *dln2_buf, u16 len, u8 bpw) +{ +#ifdef __LITTLE_ENDIAN + memcpy(dest, dln2_buf, len); +#else + if (bpw <= 8) { + memcpy(dest, dln2_buf, len); + } else if (bpw <= 16) { + u16 *d = (u16 *)dest; + __le16 *s = (__le16 *)dln2_buf; + + len = len / 2; + while (len--) + *d++ = le16_to_cpup(s++); + } else { + u32 *d = (u32 *)dest; + __le32 *s = (__le32 *)dln2_buf; + + len = len / 4; + while (len--) + *d++ = get_unaligned_le32(s++); + } +#endif + + return 0; +} + +/* + * Perform one write operation. + */ +static int dln2_spi_write_one(struct dln2_spi *dln2, const u8 *data, + u16 data_len, u8 attr) +{ + struct { + u8 port; + __le16 size; + u8 attr; + u8 buf[DLN2_SPI_MAX_XFER_SIZE]; + } __packed *tx = dln2->buf; + unsigned tx_len; + + BUILD_BUG_ON(sizeof(*tx) > DLN2_SPI_BUF_SIZE); + + if (data_len > DLN2_SPI_MAX_XFER_SIZE) + return -EINVAL; + + tx->port = dln2->port; + tx->size = cpu_to_le16(data_len); + tx->attr = attr; + + dln2_spi_copy_to_buf(tx->buf, data, data_len, dln2->bpw); + + tx_len = sizeof(*tx) + data_len - DLN2_SPI_MAX_XFER_SIZE; + return dln2_transfer_tx(dln2->pdev, DLN2_SPI_WRITE, tx, tx_len); +} + +/* + * Perform one read operation. + */ +static int dln2_spi_read_one(struct dln2_spi *dln2, u8 *data, + u16 data_len, u8 attr) +{ + int ret; + struct { + u8 port; + __le16 size; + u8 attr; + } __packed tx; + struct { + __le16 size; + u8 buf[DLN2_SPI_MAX_XFER_SIZE]; + } __packed *rx = dln2->buf; + unsigned rx_len = sizeof(*rx); + + BUILD_BUG_ON(sizeof(*rx) > DLN2_SPI_BUF_SIZE); + + if (data_len > DLN2_SPI_MAX_XFER_SIZE) + return -EINVAL; + + tx.port = dln2->port; + tx.size = cpu_to_le16(data_len); + tx.attr = attr; + + ret = dln2_transfer(dln2->pdev, DLN2_SPI_READ, &tx, sizeof(tx), + rx, &rx_len); + if (ret < 0) + return ret; + if (rx_len < sizeof(rx->size) + data_len) + return -EPROTO; + if (le16_to_cpu(rx->size) != data_len) + return -EPROTO; + + dln2_spi_copy_from_buf(data, rx->buf, data_len, dln2->bpw); + + return 0; +} + +/* + * Perform one write & read operation. + */ +static int dln2_spi_read_write_one(struct dln2_spi *dln2, const u8 *tx_data, + u8 *rx_data, u16 data_len, u8 attr) +{ + int ret; + struct { + u8 port; + __le16 size; + u8 attr; + u8 buf[DLN2_SPI_MAX_XFER_SIZE]; + } __packed *tx; + struct { + __le16 size; + u8 buf[DLN2_SPI_MAX_XFER_SIZE]; + } __packed *rx; + unsigned tx_len, rx_len; + + BUILD_BUG_ON(sizeof(*tx) > DLN2_SPI_BUF_SIZE || + sizeof(*rx) > DLN2_SPI_BUF_SIZE); + + if (data_len > DLN2_SPI_MAX_XFER_SIZE) + return -EINVAL; + + /* + * Since this is a pseudo full-duplex communication, we're perfectly + * safe to use the same buffer for both tx and rx. When DLN2 sends the + * response back, with the rx data, we don't need the tx buffer anymore. + */ + tx = dln2->buf; + rx = dln2->buf; + + tx->port = dln2->port; + tx->size = cpu_to_le16(data_len); + tx->attr = attr; + + dln2_spi_copy_to_buf(tx->buf, tx_data, data_len, dln2->bpw); + + tx_len = sizeof(*tx) + data_len - DLN2_SPI_MAX_XFER_SIZE; + rx_len = sizeof(*rx); + + ret = dln2_transfer(dln2->pdev, DLN2_SPI_READ_WRITE, tx, tx_len, + rx, &rx_len); + if (ret < 0) + return ret; + if (rx_len < sizeof(rx->size) + data_len) + return -EPROTO; + if (le16_to_cpu(rx->size) != data_len) + return -EPROTO; + + dln2_spi_copy_from_buf(rx_data, rx->buf, data_len, dln2->bpw); + + return 0; +} + +/* + * Read/Write wrapper. It will automatically split an operation into multiple + * single ones due to device buffer constraints. + */ +static int dln2_spi_rdwr(struct dln2_spi *dln2, const u8 *tx_data, + u8 *rx_data, u16 data_len, u8 attr) { + int ret; + u16 len; + u8 temp_attr; + u16 remaining = data_len; + u16 offset; + + do { + if (remaining > DLN2_SPI_MAX_XFER_SIZE) { + len = DLN2_SPI_MAX_XFER_SIZE; + temp_attr = DLN2_SPI_ATTR_LEAVE_SS_LOW; + } else { + len = remaining; + temp_attr = attr; + } + + offset = data_len - remaining; + + if (tx_data && rx_data) { + ret = dln2_spi_read_write_one(dln2, + tx_data + offset, + rx_data + offset, + len, temp_attr); + } else if (tx_data) { + ret = dln2_spi_write_one(dln2, + tx_data + offset, + len, temp_attr); + } else if (rx_data) { + ret = dln2_spi_read_one(dln2, + rx_data + offset, + len, temp_attr); + } else { + return -EINVAL; + } + + if (ret < 0) + return ret; + + remaining -= len; + } while (remaining); + + return 0; +} + +static int dln2_spi_prepare_message(struct spi_master *master, + struct spi_message *message) +{ + int ret; + struct dln2_spi *dln2 = spi_master_get_devdata(master); + struct spi_device *spi = message->spi; + + if (dln2->cs != spi->chip_select) { + ret = dln2_spi_cs_set_one(dln2, spi->chip_select); + if (ret < 0) + return ret; + + dln2->cs = spi->chip_select; + } + + return 0; +} + +static int dln2_spi_transfer_setup(struct dln2_spi *dln2, u32 speed, + u8 bpw, u8 mode) +{ + int ret; + bool bus_setup_change; + + bus_setup_change = dln2->speed != speed || dln2->mode != mode || + dln2->bpw != bpw; + + if (!bus_setup_change) + return 0; + + ret = dln2_spi_enable(dln2, false); + if (ret < 0) + return ret; + + if (dln2->speed != speed) { + ret = dln2_spi_set_speed(dln2, speed); + if (ret < 0) + return ret; + + dln2->speed = speed; + } + + if (dln2->mode != mode) { + ret = dln2_spi_set_mode(dln2, mode & 0x3); + if (ret < 0) + return ret; + + dln2->mode = mode; + } + + if (dln2->bpw != bpw) { + ret = dln2_spi_set_bpw(dln2, bpw); + if (ret < 0) + return ret; + + dln2->bpw = bpw; + } + + return dln2_spi_enable(dln2, true); +} + +static int dln2_spi_transfer_one(struct spi_master *master, + struct spi_device *spi, + struct spi_transfer *xfer) +{ + struct dln2_spi *dln2 = spi_master_get_devdata(master); + int status; + u8 attr = 0; + + status = dln2_spi_transfer_setup(dln2, xfer->speed_hz, + xfer->bits_per_word, + spi->mode); + if (status < 0) { + dev_err(&dln2->pdev->dev, "Cannot setup transfer\n"); + return status; + } + + if (!xfer->cs_change && !spi_transfer_is_last(master, xfer)) + attr = DLN2_SPI_ATTR_LEAVE_SS_LOW; + + status = dln2_spi_rdwr(dln2, xfer->tx_buf, xfer->rx_buf, + xfer->len, attr); + if (status < 0) + dev_err(&dln2->pdev->dev, "write/read failed!\n"); + + return status; +} + +static int dln2_spi_probe(struct platform_device *pdev) +{ + struct spi_master *master; + struct dln2_spi *dln2; + struct dln2_platform_data *pdata = dev_get_platdata(&pdev->dev); + struct device *dev = &pdev->dev; + int ret; + + master = spi_alloc_master(&pdev->dev, sizeof(*dln2)); + if (!master) + return -ENOMEM; + + platform_set_drvdata(pdev, master); + + dln2 = spi_master_get_devdata(master); + + dln2->buf = devm_kmalloc(&pdev->dev, DLN2_SPI_BUF_SIZE, GFP_KERNEL); + if (!dln2->buf) { + ret = -ENOMEM; + goto exit_free_master; + } + + dln2->master = master; + dln2->master->dev.of_node = dev->of_node; + dln2->pdev = pdev; + dln2->port = pdata->port; + /* cs/mode can never be 0xff, so the first transfer will set them */ + dln2->cs = 0xff; + dln2->mode = 0xff; + + /* disable SPI module before continuing with the setup */ + ret = dln2_spi_enable(dln2, false); + if (ret < 0) { + dev_err(&pdev->dev, "Failed to disable SPI module\n"); + goto exit_free_master; + } + + ret = dln2_spi_get_cs_num(dln2, &master->num_chipselect); + if (ret < 0) { + dev_err(&pdev->dev, "Failed to get number of CS pins\n"); + goto exit_free_master; + } + + ret = dln2_spi_get_speed_range(dln2, + &master->min_speed_hz, + &master->max_speed_hz); + if (ret < 0) { + dev_err(&pdev->dev, "Failed to read bus min/max freqs\n"); + goto exit_free_master; + } + + ret = dln2_spi_get_supported_frame_sizes(dln2, + &master->bits_per_word_mask); + if (ret < 0) { + dev_err(&pdev->dev, "Failed to read supported frame sizes\n"); + goto exit_free_master; + } + + ret = dln2_spi_cs_enable_all(dln2, true); + if (ret < 0) { + dev_err(&pdev->dev, "Failed to enable CS pins\n"); + goto exit_free_master; + } + + master->bus_num = -1; + master->mode_bits = SPI_CPOL | SPI_CPHA; + master->prepare_message = dln2_spi_prepare_message; + master->transfer_one = dln2_spi_transfer_one; + master->auto_runtime_pm = true; + + /* enable SPI module, we're good to go */ + ret = dln2_spi_enable(dln2, true); + if (ret < 0) { + dev_err(&pdev->dev, "Failed to enable SPI module\n"); + goto exit_free_master; + } + + pm_runtime_set_autosuspend_delay(&pdev->dev, + DLN2_RPM_AUTOSUSPEND_TIMEOUT); + pm_runtime_use_autosuspend(&pdev->dev); + pm_runtime_set_active(&pdev->dev); + pm_runtime_enable(&pdev->dev); + + ret = devm_spi_register_master(&pdev->dev, master); + if (ret < 0) { + dev_err(&pdev->dev, "Failed to register master\n"); + goto exit_register; + } + + return ret; + +exit_register: + pm_runtime_disable(&pdev->dev); + pm_runtime_set_suspended(&pdev->dev); + + if (dln2_spi_enable(dln2, false) < 0) + dev_err(&pdev->dev, "Failed to disable SPI module\n"); +exit_free_master: + spi_master_put(master); + + return ret; +} + +static int dln2_spi_remove(struct platform_device *pdev) +{ + struct spi_master *master = platform_get_drvdata(pdev); + struct dln2_spi *dln2 = spi_master_get_devdata(master); + + pm_runtime_disable(&pdev->dev); + + if (dln2_spi_enable(dln2, false) < 0) + dev_err(&pdev->dev, "Failed to disable SPI module\n"); + + return 0; +} + +#ifdef CONFIG_PM_SLEEP +static int dln2_spi_suspend(struct device *dev) +{ + int ret; + struct spi_master *master = dev_get_drvdata(dev); + struct dln2_spi *dln2 = spi_master_get_devdata(master); + + ret = spi_master_suspend(master); + if (ret < 0) + return ret; + + if (!pm_runtime_suspended(dev)) { + ret = dln2_spi_enable(dln2, false); + if (ret < 0) + return ret; + } + + /* + * USB power may be cut off during sleep. Resetting the following + * parameters will force the board to be set up before first transfer. + */ + dln2->cs = 0xff; + dln2->speed = 0; + dln2->bpw = 0; + dln2->mode = 0xff; + + return 0; +} + +static int dln2_spi_resume(struct device *dev) +{ + int ret; + struct spi_master *master = dev_get_drvdata(dev); + struct dln2_spi *dln2 = spi_master_get_devdata(master); + + if (!pm_runtime_suspended(dev)) { + ret = dln2_spi_cs_enable_all(dln2, true); + if (ret < 0) + return ret; + + ret = dln2_spi_enable(dln2, true); + if (ret < 0) + return ret; + } + + return spi_master_resume(master); +} +#endif /* CONFIG_PM_SLEEP */ + +#ifdef CONFIG_PM +static int dln2_spi_runtime_suspend(struct device *dev) +{ + struct spi_master *master = dev_get_drvdata(dev); + struct dln2_spi *dln2 = spi_master_get_devdata(master); + + return dln2_spi_enable(dln2, false); +} + +static int dln2_spi_runtime_resume(struct device *dev) +{ + struct spi_master *master = dev_get_drvdata(dev); + struct dln2_spi *dln2 = spi_master_get_devdata(master); + + return dln2_spi_enable(dln2, true); +} +#endif /* CONFIG_PM */ + +static const struct dev_pm_ops dln2_spi_pm = { + SET_SYSTEM_SLEEP_PM_OPS(dln2_spi_suspend, dln2_spi_resume) + SET_RUNTIME_PM_OPS(dln2_spi_runtime_suspend, + dln2_spi_runtime_resume, NULL) +}; + +static struct platform_driver spi_dln2_driver = { + .driver = { + .name = "dln2-spi", + .pm = &dln2_spi_pm, + }, + .probe = dln2_spi_probe, + .remove = dln2_spi_remove, +}; +module_platform_driver(spi_dln2_driver); + +MODULE_DESCRIPTION("Driver for the Diolan DLN2 SPI master interface"); +MODULE_AUTHOR("Laurentiu Palcu <laurentiu.palcu@intel.com>"); +MODULE_LICENSE("GPL v2"); +MODULE_ALIAS("platform:dln2-spi"); diff --git a/drivers/spi/spi-dw-bt1.c b/drivers/spi/spi-dw-bt1.c new file mode 100644 index 000000000..8f6a1af14 --- /dev/null +++ b/drivers/spi/spi-dw-bt1.c @@ -0,0 +1,343 @@ +// SPDX-License-Identifier: GPL-2.0-only +// +// Copyright (C) 2020 BAIKAL ELECTRONICS, JSC +// +// Authors: +// Ramil Zaripov <Ramil.Zaripov@baikalelectronics.ru> +// Serge Semin <Sergey.Semin@baikalelectronics.ru> +// +// Baikal-T1 DW APB SPI and System Boot SPI driver +// + +#include <linux/clk.h> +#include <linux/cpumask.h> +#include <linux/err.h> +#include <linux/interrupt.h> +#include <linux/module.h> +#include <linux/mux/consumer.h> +#include <linux/of.h> +#include <linux/of_platform.h> +#include <linux/platform_device.h> +#include <linux/pm_runtime.h> +#include <linux/property.h> +#include <linux/slab.h> +#include <linux/spi/spi-mem.h> +#include <linux/spi/spi.h> + +#include "spi-dw.h" + +#define BT1_BOOT_DIRMAP 0 +#define BT1_BOOT_REGS 1 + +struct dw_spi_bt1 { + struct dw_spi dws; + struct clk *clk; + struct mux_control *mux; + +#ifdef CONFIG_SPI_DW_BT1_DIRMAP + void __iomem *map; + resource_size_t map_len; +#endif +}; +#define to_dw_spi_bt1(_ctlr) \ + container_of(spi_controller_get_devdata(_ctlr), struct dw_spi_bt1, dws) + +typedef int (*dw_spi_bt1_init_cb)(struct platform_device *pdev, + struct dw_spi_bt1 *dwsbt1); + +#ifdef CONFIG_SPI_DW_BT1_DIRMAP + +static int dw_spi_bt1_dirmap_create(struct spi_mem_dirmap_desc *desc) +{ + struct dw_spi_bt1 *dwsbt1 = to_dw_spi_bt1(desc->mem->spi->controller); + + if (!dwsbt1->map || + !dwsbt1->dws.mem_ops.supports_op(desc->mem, &desc->info.op_tmpl)) + return -EOPNOTSUPP; + + /* + * Make sure the requested region doesn't go out of the physically + * mapped flash memory bounds and the operation is read-only. + */ + if (desc->info.offset + desc->info.length > dwsbt1->map_len || + desc->info.op_tmpl.data.dir != SPI_MEM_DATA_IN) + return -EOPNOTSUPP; + + return 0; +} + +/* + * Directly mapped SPI memory region is only accessible in the dword chunks. + * That's why we have to create a dedicated read-method to copy data from there + * to the passed buffer. + */ +static void dw_spi_bt1_dirmap_copy_from_map(void *to, void __iomem *from, size_t len) +{ + size_t shift, chunk; + u32 data; + + /* + * We split the copying up into the next three stages: unaligned head, + * aligned body, unaligned tail. + */ + shift = (size_t)from & 0x3; + if (shift) { + chunk = min_t(size_t, 4 - shift, len); + data = readl_relaxed(from - shift); + memcpy(to, (char *)&data + shift, chunk); + from += chunk; + to += chunk; + len -= chunk; + } + + while (len >= 4) { + data = readl_relaxed(from); + memcpy(to, &data, 4); + from += 4; + to += 4; + len -= 4; + } + + if (len) { + data = readl_relaxed(from); + memcpy(to, &data, len); + } +} + +static ssize_t dw_spi_bt1_dirmap_read(struct spi_mem_dirmap_desc *desc, + u64 offs, size_t len, void *buf) +{ + struct dw_spi_bt1 *dwsbt1 = to_dw_spi_bt1(desc->mem->spi->controller); + struct dw_spi *dws = &dwsbt1->dws; + struct spi_mem *mem = desc->mem; + struct dw_spi_cfg cfg; + int ret; + + /* + * Make sure the requested operation length is valid. Truncate the + * length if it's greater than the length of the MMIO region. + */ + if (offs >= dwsbt1->map_len || !len) + return 0; + + len = min_t(size_t, len, dwsbt1->map_len - offs); + + /* Collect the controller configuration required by the operation */ + cfg.tmode = SPI_TMOD_EPROMREAD; + cfg.dfs = 8; + cfg.ndf = 4; + cfg.freq = mem->spi->max_speed_hz; + + /* Make sure the corresponding CS is de-asserted on transmission */ + dw_spi_set_cs(mem->spi, false); + + spi_enable_chip(dws, 0); + + dw_spi_update_config(dws, mem->spi, &cfg); + + spi_umask_intr(dws, SPI_INT_RXFI); + + spi_enable_chip(dws, 1); + + /* + * Enable the transparent mode of the System Boot Controller. + * The SPI core IO should have been locked before calling this method + * so noone would be touching the controller' registers during the + * dirmap operation. + */ + ret = mux_control_select(dwsbt1->mux, BT1_BOOT_DIRMAP); + if (ret) + return ret; + + dw_spi_bt1_dirmap_copy_from_map(buf, dwsbt1->map + offs, len); + + mux_control_deselect(dwsbt1->mux); + + dw_spi_set_cs(mem->spi, true); + + ret = dw_spi_check_status(dws, true); + + return ret ?: len; +} + +#endif /* CONFIG_SPI_DW_BT1_DIRMAP */ + +static int dw_spi_bt1_std_init(struct platform_device *pdev, + struct dw_spi_bt1 *dwsbt1) +{ + struct dw_spi *dws = &dwsbt1->dws; + + dws->irq = platform_get_irq(pdev, 0); + if (dws->irq < 0) + return dws->irq; + + dws->num_cs = 4; + + /* + * Baikal-T1 Normal SPI Controllers don't always keep up with full SPI + * bus speed especially when it comes to the concurrent access to the + * APB bus resources. Thus we have no choice but to set a constraint on + * the SPI bus frequency for the memory operations which require to + * read/write data as fast as possible. + */ + dws->max_mem_freq = 20000000U; + + dw_spi_dma_setup_generic(dws); + + return 0; +} + +static int dw_spi_bt1_sys_init(struct platform_device *pdev, + struct dw_spi_bt1 *dwsbt1) +{ + struct resource *mem __maybe_unused; + struct dw_spi *dws = &dwsbt1->dws; + + /* + * Baikal-T1 System Boot Controller is equipped with a mux, which + * switches between the directly mapped SPI flash access mode and + * IO access to the DW APB SSI registers. Note the mux controller + * must be setup to preserve the registers being accessible by default + * (on idle-state). + */ + dwsbt1->mux = devm_mux_control_get(&pdev->dev, NULL); + if (IS_ERR(dwsbt1->mux)) + return PTR_ERR(dwsbt1->mux); + + /* + * Directly mapped SPI flash memory is a 16MB MMIO region, which can be + * used to access a peripheral memory device just by reading/writing + * data from/to it. Note the system APB bus will stall during each IO + * from/to the dirmap region until the operation is finished. So don't + * use it concurrently with time-critical tasks (like the SPI memory + * operations implemented in the DW APB SSI driver). + */ +#ifdef CONFIG_SPI_DW_BT1_DIRMAP + mem = platform_get_resource(pdev, IORESOURCE_MEM, 1); + if (mem) { + dwsbt1->map = devm_ioremap_resource(&pdev->dev, mem); + if (!IS_ERR(dwsbt1->map)) { + dwsbt1->map_len = (mem->end - mem->start + 1); + dws->mem_ops.dirmap_create = dw_spi_bt1_dirmap_create; + dws->mem_ops.dirmap_read = dw_spi_bt1_dirmap_read; + } else { + dwsbt1->map = NULL; + } + } +#endif /* CONFIG_SPI_DW_BT1_DIRMAP */ + + /* + * There is no IRQ, no DMA and just one CS available on the System Boot + * SPI controller. + */ + dws->irq = IRQ_NOTCONNECTED; + dws->num_cs = 1; + + /* + * Baikal-T1 System Boot SPI Controller doesn't keep up with the full + * SPI bus speed due to relatively slow APB bus and races for it' + * resources from different CPUs. The situation is worsen by a small + * FIFOs depth (just 8 words). It works better in a single CPU mode + * though, but still tends to be not fast enough at low CPU + * frequencies. + */ + if (num_possible_cpus() > 1) + dws->max_mem_freq = 10000000U; + else + dws->max_mem_freq = 20000000U; + + return 0; +} + +static int dw_spi_bt1_probe(struct platform_device *pdev) +{ + dw_spi_bt1_init_cb init_func; + struct dw_spi_bt1 *dwsbt1; + struct resource *mem; + struct dw_spi *dws; + int ret; + + dwsbt1 = devm_kzalloc(&pdev->dev, sizeof(struct dw_spi_bt1), GFP_KERNEL); + if (!dwsbt1) + return -ENOMEM; + + dws = &dwsbt1->dws; + + dws->regs = devm_platform_get_and_ioremap_resource(pdev, 0, &mem); + if (IS_ERR(dws->regs)) + return PTR_ERR(dws->regs); + + dws->paddr = mem->start; + + dwsbt1->clk = devm_clk_get(&pdev->dev, NULL); + if (IS_ERR(dwsbt1->clk)) + return PTR_ERR(dwsbt1->clk); + + ret = clk_prepare_enable(dwsbt1->clk); + if (ret) + return ret; + + dws->bus_num = pdev->id; + dws->reg_io_width = 4; + dws->max_freq = clk_get_rate(dwsbt1->clk); + if (!dws->max_freq) { + ret = -EINVAL; + goto err_disable_clk; + } + + init_func = device_get_match_data(&pdev->dev); + ret = init_func(pdev, dwsbt1); + if (ret) + goto err_disable_clk; + + pm_runtime_enable(&pdev->dev); + + ret = dw_spi_add_host(&pdev->dev, dws); + if (ret) { + pm_runtime_disable(&pdev->dev); + goto err_disable_clk; + } + + platform_set_drvdata(pdev, dwsbt1); + + return 0; + +err_disable_clk: + clk_disable_unprepare(dwsbt1->clk); + + return ret; +} + +static int dw_spi_bt1_remove(struct platform_device *pdev) +{ + struct dw_spi_bt1 *dwsbt1 = platform_get_drvdata(pdev); + + dw_spi_remove_host(&dwsbt1->dws); + + pm_runtime_disable(&pdev->dev); + + clk_disable_unprepare(dwsbt1->clk); + + return 0; +} + +static const struct of_device_id dw_spi_bt1_of_match[] = { + { .compatible = "baikal,bt1-ssi", .data = dw_spi_bt1_std_init}, + { .compatible = "baikal,bt1-sys-ssi", .data = dw_spi_bt1_sys_init}, + { } +}; +MODULE_DEVICE_TABLE(of, dw_spi_bt1_of_match); + +static struct platform_driver dw_spi_bt1_driver = { + .probe = dw_spi_bt1_probe, + .remove = dw_spi_bt1_remove, + .driver = { + .name = "bt1-sys-ssi", + .of_match_table = dw_spi_bt1_of_match, + }, +}; +module_platform_driver(dw_spi_bt1_driver); + +MODULE_AUTHOR("Serge Semin <Sergey.Semin@baikalelectronics.ru>"); +MODULE_DESCRIPTION("Baikal-T1 System Boot SPI Controller driver"); +MODULE_LICENSE("GPL v2"); diff --git a/drivers/spi/spi-dw-core.c b/drivers/spi/spi-dw-core.c new file mode 100644 index 000000000..aa116cee1 --- /dev/null +++ b/drivers/spi/spi-dw-core.c @@ -0,0 +1,957 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Designware SPI core controller driver (refer pxa2xx_spi.c) + * + * Copyright (c) 2009, Intel Corporation. + */ + +#include <linux/dma-mapping.h> +#include <linux/interrupt.h> +#include <linux/module.h> +#include <linux/preempt.h> +#include <linux/highmem.h> +#include <linux/delay.h> +#include <linux/slab.h> +#include <linux/spi/spi.h> +#include <linux/spi/spi-mem.h> +#include <linux/string.h> +#include <linux/of.h> + +#include "spi-dw.h" + +#ifdef CONFIG_DEBUG_FS +#include <linux/debugfs.h> +#endif + +/* Slave spi_device related */ +struct chip_data { + u32 cr0; + u32 rx_sample_dly; /* RX sample delay */ +}; + +#ifdef CONFIG_DEBUG_FS + +#define DW_SPI_DBGFS_REG(_name, _off) \ +{ \ + .name = _name, \ + .offset = _off, \ +} + +static const struct debugfs_reg32 dw_spi_dbgfs_regs[] = { + DW_SPI_DBGFS_REG("CTRLR0", DW_SPI_CTRLR0), + DW_SPI_DBGFS_REG("CTRLR1", DW_SPI_CTRLR1), + DW_SPI_DBGFS_REG("SSIENR", DW_SPI_SSIENR), + DW_SPI_DBGFS_REG("SER", DW_SPI_SER), + DW_SPI_DBGFS_REG("BAUDR", DW_SPI_BAUDR), + DW_SPI_DBGFS_REG("TXFTLR", DW_SPI_TXFTLR), + DW_SPI_DBGFS_REG("RXFTLR", DW_SPI_RXFTLR), + DW_SPI_DBGFS_REG("TXFLR", DW_SPI_TXFLR), + DW_SPI_DBGFS_REG("RXFLR", DW_SPI_RXFLR), + DW_SPI_DBGFS_REG("SR", DW_SPI_SR), + DW_SPI_DBGFS_REG("IMR", DW_SPI_IMR), + DW_SPI_DBGFS_REG("ISR", DW_SPI_ISR), + DW_SPI_DBGFS_REG("DMACR", DW_SPI_DMACR), + DW_SPI_DBGFS_REG("DMATDLR", DW_SPI_DMATDLR), + DW_SPI_DBGFS_REG("DMARDLR", DW_SPI_DMARDLR), + DW_SPI_DBGFS_REG("RX_SAMPLE_DLY", DW_SPI_RX_SAMPLE_DLY), +}; + +static int dw_spi_debugfs_init(struct dw_spi *dws) +{ + char name[32]; + + snprintf(name, 32, "dw_spi%d", dws->master->bus_num); + dws->debugfs = debugfs_create_dir(name, NULL); + if (!dws->debugfs) + return -ENOMEM; + + dws->regset.regs = dw_spi_dbgfs_regs; + dws->regset.nregs = ARRAY_SIZE(dw_spi_dbgfs_regs); + dws->regset.base = dws->regs; + debugfs_create_regset32("registers", 0400, dws->debugfs, &dws->regset); + + return 0; +} + +static void dw_spi_debugfs_remove(struct dw_spi *dws) +{ + debugfs_remove_recursive(dws->debugfs); +} + +#else +static inline int dw_spi_debugfs_init(struct dw_spi *dws) +{ + return 0; +} + +static inline void dw_spi_debugfs_remove(struct dw_spi *dws) +{ +} +#endif /* CONFIG_DEBUG_FS */ + +void dw_spi_set_cs(struct spi_device *spi, bool enable) +{ + struct dw_spi *dws = spi_controller_get_devdata(spi->controller); + bool cs_high = !!(spi->mode & SPI_CS_HIGH); + + /* + * DW SPI controller demands any native CS being set in order to + * proceed with data transfer. So in order to activate the SPI + * communications we must set a corresponding bit in the Slave + * Enable register no matter whether the SPI core is configured to + * support active-high or active-low CS level. + */ + if (cs_high == enable) + dw_writel(dws, DW_SPI_SER, BIT(spi->chip_select)); + else + dw_writel(dws, DW_SPI_SER, 0); +} +EXPORT_SYMBOL_GPL(dw_spi_set_cs); + +/* Return the max entries we can fill into tx fifo */ +static inline u32 tx_max(struct dw_spi *dws) +{ + u32 tx_room, rxtx_gap; + + tx_room = dws->fifo_len - dw_readl(dws, DW_SPI_TXFLR); + + /* + * Another concern is about the tx/rx mismatch, we + * though to use (dws->fifo_len - rxflr - txflr) as + * one maximum value for tx, but it doesn't cover the + * data which is out of tx/rx fifo and inside the + * shift registers. So a control from sw point of + * view is taken. + */ + rxtx_gap = dws->fifo_len - (dws->rx_len - dws->tx_len); + + return min3((u32)dws->tx_len, tx_room, rxtx_gap); +} + +/* Return the max entries we should read out of rx fifo */ +static inline u32 rx_max(struct dw_spi *dws) +{ + return min_t(u32, dws->rx_len, dw_readl(dws, DW_SPI_RXFLR)); +} + +static void dw_writer(struct dw_spi *dws) +{ + u32 max = tx_max(dws); + u16 txw = 0; + + while (max--) { + if (dws->tx) { + if (dws->n_bytes == 1) + txw = *(u8 *)(dws->tx); + else + txw = *(u16 *)(dws->tx); + + dws->tx += dws->n_bytes; + } + dw_write_io_reg(dws, DW_SPI_DR, txw); + --dws->tx_len; + } +} + +static void dw_reader(struct dw_spi *dws) +{ + u32 max = rx_max(dws); + u16 rxw; + + while (max--) { + rxw = dw_read_io_reg(dws, DW_SPI_DR); + if (dws->rx) { + if (dws->n_bytes == 1) + *(u8 *)(dws->rx) = rxw; + else + *(u16 *)(dws->rx) = rxw; + + dws->rx += dws->n_bytes; + } + --dws->rx_len; + } +} + +int dw_spi_check_status(struct dw_spi *dws, bool raw) +{ + u32 irq_status; + int ret = 0; + + if (raw) + irq_status = dw_readl(dws, DW_SPI_RISR); + else + irq_status = dw_readl(dws, DW_SPI_ISR); + + if (irq_status & SPI_INT_RXOI) { + dev_err(&dws->master->dev, "RX FIFO overflow detected\n"); + ret = -EIO; + } + + if (irq_status & SPI_INT_RXUI) { + dev_err(&dws->master->dev, "RX FIFO underflow detected\n"); + ret = -EIO; + } + + if (irq_status & SPI_INT_TXOI) { + dev_err(&dws->master->dev, "TX FIFO overflow detected\n"); + ret = -EIO; + } + + /* Generically handle the erroneous situation */ + if (ret) { + spi_reset_chip(dws); + if (dws->master->cur_msg) + dws->master->cur_msg->status = ret; + } + + return ret; +} +EXPORT_SYMBOL_GPL(dw_spi_check_status); + +static irqreturn_t dw_spi_transfer_handler(struct dw_spi *dws) +{ + u16 irq_status = dw_readl(dws, DW_SPI_ISR); + + if (dw_spi_check_status(dws, false)) { + spi_finalize_current_transfer(dws->master); + return IRQ_HANDLED; + } + + /* + * Read data from the Rx FIFO every time we've got a chance executing + * this method. If there is nothing left to receive, terminate the + * procedure. Otherwise adjust the Rx FIFO Threshold level if it's a + * final stage of the transfer. By doing so we'll get the next IRQ + * right when the leftover incoming data is received. + */ + dw_reader(dws); + if (!dws->rx_len) { + spi_mask_intr(dws, 0xff); + spi_finalize_current_transfer(dws->master); + } else if (dws->rx_len <= dw_readl(dws, DW_SPI_RXFTLR)) { + dw_writel(dws, DW_SPI_RXFTLR, dws->rx_len - 1); + } + + /* + * Send data out if Tx FIFO Empty IRQ is received. The IRQ will be + * disabled after the data transmission is finished so not to + * have the TXE IRQ flood at the final stage of the transfer. + */ + if (irq_status & SPI_INT_TXEI) { + dw_writer(dws); + if (!dws->tx_len) + spi_mask_intr(dws, SPI_INT_TXEI); + } + + return IRQ_HANDLED; +} + +static irqreturn_t dw_spi_irq(int irq, void *dev_id) +{ + struct spi_controller *master = dev_id; + struct dw_spi *dws = spi_controller_get_devdata(master); + u16 irq_status = dw_readl(dws, DW_SPI_ISR) & 0x3f; + + if (!irq_status) + return IRQ_NONE; + + if (!master->cur_msg) { + spi_mask_intr(dws, 0xff); + return IRQ_HANDLED; + } + + return dws->transfer_handler(dws); +} + +static u32 dw_spi_prepare_cr0(struct dw_spi *dws, struct spi_device *spi) +{ + u32 cr0 = 0; + + if (!(dws->caps & DW_SPI_CAP_DWC_SSI)) { + /* CTRLR0[ 5: 4] Frame Format */ + cr0 |= SSI_MOTO_SPI << SPI_FRF_OFFSET; + + /* + * SPI mode (SCPOL|SCPH) + * CTRLR0[ 6] Serial Clock Phase + * CTRLR0[ 7] Serial Clock Polarity + */ + cr0 |= ((spi->mode & SPI_CPOL) ? 1 : 0) << SPI_SCOL_OFFSET; + cr0 |= ((spi->mode & SPI_CPHA) ? 1 : 0) << SPI_SCPH_OFFSET; + + /* CTRLR0[11] Shift Register Loop */ + cr0 |= ((spi->mode & SPI_LOOP) ? 1 : 0) << SPI_SRL_OFFSET; + } else { + /* CTRLR0[ 7: 6] Frame Format */ + cr0 |= SSI_MOTO_SPI << DWC_SSI_CTRLR0_FRF_OFFSET; + + /* + * SPI mode (SCPOL|SCPH) + * CTRLR0[ 8] Serial Clock Phase + * CTRLR0[ 9] Serial Clock Polarity + */ + cr0 |= ((spi->mode & SPI_CPOL) ? 1 : 0) << DWC_SSI_CTRLR0_SCPOL_OFFSET; + cr0 |= ((spi->mode & SPI_CPHA) ? 1 : 0) << DWC_SSI_CTRLR0_SCPH_OFFSET; + + /* CTRLR0[13] Shift Register Loop */ + cr0 |= ((spi->mode & SPI_LOOP) ? 1 : 0) << DWC_SSI_CTRLR0_SRL_OFFSET; + + if (dws->caps & DW_SPI_CAP_KEEMBAY_MST) + cr0 |= DWC_SSI_CTRLR0_KEEMBAY_MST; + } + + return cr0; +} + +void dw_spi_update_config(struct dw_spi *dws, struct spi_device *spi, + struct dw_spi_cfg *cfg) +{ + struct chip_data *chip = spi_get_ctldata(spi); + u32 cr0 = chip->cr0; + u32 speed_hz; + u16 clk_div; + + /* CTRLR0[ 4/3: 0] Data Frame Size */ + cr0 |= (cfg->dfs - 1); + + if (!(dws->caps & DW_SPI_CAP_DWC_SSI)) + /* CTRLR0[ 9:8] Transfer Mode */ + cr0 |= cfg->tmode << SPI_TMOD_OFFSET; + else + /* CTRLR0[11:10] Transfer Mode */ + cr0 |= cfg->tmode << DWC_SSI_CTRLR0_TMOD_OFFSET; + + dw_writel(dws, DW_SPI_CTRLR0, cr0); + + if (cfg->tmode == SPI_TMOD_EPROMREAD || cfg->tmode == SPI_TMOD_RO) + dw_writel(dws, DW_SPI_CTRLR1, cfg->ndf ? cfg->ndf - 1 : 0); + + /* Note DW APB SSI clock divider doesn't support odd numbers */ + clk_div = (DIV_ROUND_UP(dws->max_freq, cfg->freq) + 1) & 0xfffe; + speed_hz = dws->max_freq / clk_div; + + if (dws->current_freq != speed_hz) { + spi_set_clk(dws, clk_div); + dws->current_freq = speed_hz; + } + + /* Update RX sample delay if required */ + if (dws->cur_rx_sample_dly != chip->rx_sample_dly) { + dw_writel(dws, DW_SPI_RX_SAMPLE_DLY, chip->rx_sample_dly); + dws->cur_rx_sample_dly = chip->rx_sample_dly; + } +} +EXPORT_SYMBOL_GPL(dw_spi_update_config); + +static void dw_spi_irq_setup(struct dw_spi *dws) +{ + u16 level; + u8 imask; + + /* + * Originally Tx and Rx data lengths match. Rx FIFO Threshold level + * will be adjusted at the final stage of the IRQ-based SPI transfer + * execution so not to lose the leftover of the incoming data. + */ + level = min_t(unsigned int, dws->fifo_len / 2, dws->tx_len); + dw_writel(dws, DW_SPI_TXFTLR, level); + dw_writel(dws, DW_SPI_RXFTLR, level - 1); + + dws->transfer_handler = dw_spi_transfer_handler; + + imask = SPI_INT_TXEI | SPI_INT_TXOI | SPI_INT_RXUI | SPI_INT_RXOI | + SPI_INT_RXFI; + spi_umask_intr(dws, imask); +} + +/* + * The iterative procedure of the poll-based transfer is simple: write as much + * as possible to the Tx FIFO, wait until the pending to receive data is ready + * to be read, read it from the Rx FIFO and check whether the performed + * procedure has been successful. + * + * Note this method the same way as the IRQ-based transfer won't work well for + * the SPI devices connected to the controller with native CS due to the + * automatic CS assertion/de-assertion. + */ +static int dw_spi_poll_transfer(struct dw_spi *dws, + struct spi_transfer *transfer) +{ + struct spi_delay delay; + u16 nbits; + int ret; + + delay.unit = SPI_DELAY_UNIT_SCK; + nbits = dws->n_bytes * BITS_PER_BYTE; + + do { + dw_writer(dws); + + delay.value = nbits * (dws->rx_len - dws->tx_len); + spi_delay_exec(&delay, transfer); + + dw_reader(dws); + + ret = dw_spi_check_status(dws, true); + if (ret) + return ret; + } while (dws->rx_len); + + return 0; +} + +static int dw_spi_transfer_one(struct spi_controller *master, + struct spi_device *spi, struct spi_transfer *transfer) +{ + struct dw_spi *dws = spi_controller_get_devdata(master); + struct dw_spi_cfg cfg = { + .tmode = SPI_TMOD_TR, + .dfs = transfer->bits_per_word, + .freq = transfer->speed_hz, + }; + int ret; + + dws->dma_mapped = 0; + dws->n_bytes = DIV_ROUND_UP(transfer->bits_per_word, BITS_PER_BYTE); + dws->tx = (void *)transfer->tx_buf; + dws->tx_len = transfer->len / dws->n_bytes; + dws->rx = transfer->rx_buf; + dws->rx_len = dws->tx_len; + + /* Ensure the data above is visible for all CPUs */ + smp_mb(); + + spi_enable_chip(dws, 0); + + dw_spi_update_config(dws, spi, &cfg); + + transfer->effective_speed_hz = dws->current_freq; + + /* Check if current transfer is a DMA transaction */ + if (master->can_dma && master->can_dma(master, spi, transfer)) + dws->dma_mapped = master->cur_msg_mapped; + + /* For poll mode just disable all interrupts */ + spi_mask_intr(dws, 0xff); + + if (dws->dma_mapped) { + ret = dws->dma_ops->dma_setup(dws, transfer); + if (ret) + return ret; + } + + spi_enable_chip(dws, 1); + + if (dws->dma_mapped) + return dws->dma_ops->dma_transfer(dws, transfer); + else if (dws->irq == IRQ_NOTCONNECTED) + return dw_spi_poll_transfer(dws, transfer); + + dw_spi_irq_setup(dws); + + return 1; +} + +static void dw_spi_handle_err(struct spi_controller *master, + struct spi_message *msg) +{ + struct dw_spi *dws = spi_controller_get_devdata(master); + + if (dws->dma_mapped) + dws->dma_ops->dma_stop(dws); + + spi_reset_chip(dws); +} + +static int dw_spi_adjust_mem_op_size(struct spi_mem *mem, struct spi_mem_op *op) +{ + if (op->data.dir == SPI_MEM_DATA_IN) + op->data.nbytes = clamp_val(op->data.nbytes, 0, SPI_NDF_MASK + 1); + + return 0; +} + +static bool dw_spi_supports_mem_op(struct spi_mem *mem, + const struct spi_mem_op *op) +{ + if (op->data.buswidth > 1 || op->addr.buswidth > 1 || + op->dummy.buswidth > 1 || op->cmd.buswidth > 1) + return false; + + return spi_mem_default_supports_op(mem, op); +} + +static int dw_spi_init_mem_buf(struct dw_spi *dws, const struct spi_mem_op *op) +{ + unsigned int i, j, len; + u8 *out; + + /* + * Calculate the total length of the EEPROM command transfer and + * either use the pre-allocated buffer or create a temporary one. + */ + len = op->cmd.nbytes + op->addr.nbytes + op->dummy.nbytes; + if (op->data.dir == SPI_MEM_DATA_OUT) + len += op->data.nbytes; + + if (len <= SPI_BUF_SIZE) { + out = dws->buf; + } else { + out = kzalloc(len, GFP_KERNEL); + if (!out) + return -ENOMEM; + } + + /* + * Collect the operation code, address and dummy bytes into the single + * buffer. If it's a transfer with data to be sent, also copy it into the + * single buffer in order to speed the data transmission up. + */ + for (i = 0; i < op->cmd.nbytes; ++i) + out[i] = SPI_GET_BYTE(op->cmd.opcode, op->cmd.nbytes - i - 1); + for (j = 0; j < op->addr.nbytes; ++i, ++j) + out[i] = SPI_GET_BYTE(op->addr.val, op->addr.nbytes - j - 1); + for (j = 0; j < op->dummy.nbytes; ++i, ++j) + out[i] = 0x0; + + if (op->data.dir == SPI_MEM_DATA_OUT) + memcpy(&out[i], op->data.buf.out, op->data.nbytes); + + dws->n_bytes = 1; + dws->tx = out; + dws->tx_len = len; + if (op->data.dir == SPI_MEM_DATA_IN) { + dws->rx = op->data.buf.in; + dws->rx_len = op->data.nbytes; + } else { + dws->rx = NULL; + dws->rx_len = 0; + } + + return 0; +} + +static void dw_spi_free_mem_buf(struct dw_spi *dws) +{ + if (dws->tx != dws->buf) + kfree(dws->tx); +} + +static int dw_spi_write_then_read(struct dw_spi *dws, struct spi_device *spi) +{ + u32 room, entries, sts; + unsigned int len; + u8 *buf; + + /* + * At initial stage we just pre-fill the Tx FIFO in with no rush, + * since native CS hasn't been enabled yet and the automatic data + * transmission won't start til we do that. + */ + len = min(dws->fifo_len, dws->tx_len); + buf = dws->tx; + while (len--) + dw_write_io_reg(dws, DW_SPI_DR, *buf++); + + /* + * After setting any bit in the SER register the transmission will + * start automatically. We have to keep up with that procedure + * otherwise the CS de-assertion will happen whereupon the memory + * operation will be pre-terminated. + */ + len = dws->tx_len - ((void *)buf - dws->tx); + dw_spi_set_cs(spi, false); + while (len) { + entries = readl_relaxed(dws->regs + DW_SPI_TXFLR); + if (!entries) { + dev_err(&dws->master->dev, "CS de-assertion on Tx\n"); + return -EIO; + } + room = min(dws->fifo_len - entries, len); + for (; room; --room, --len) + dw_write_io_reg(dws, DW_SPI_DR, *buf++); + } + + /* + * Data fetching will start automatically if the EEPROM-read mode is + * activated. We have to keep up with the incoming data pace to + * prevent the Rx FIFO overflow causing the inbound data loss. + */ + len = dws->rx_len; + buf = dws->rx; + while (len) { + entries = readl_relaxed(dws->regs + DW_SPI_RXFLR); + if (!entries) { + sts = readl_relaxed(dws->regs + DW_SPI_RISR); + if (sts & SPI_INT_RXOI) { + dev_err(&dws->master->dev, "FIFO overflow on Rx\n"); + return -EIO; + } + continue; + } + entries = min(entries, len); + for (; entries; --entries, --len) + *buf++ = dw_read_io_reg(dws, DW_SPI_DR); + } + + return 0; +} + +static inline bool dw_spi_ctlr_busy(struct dw_spi *dws) +{ + return dw_readl(dws, DW_SPI_SR) & SR_BUSY; +} + +static int dw_spi_wait_mem_op_done(struct dw_spi *dws) +{ + int retry = SPI_WAIT_RETRIES; + struct spi_delay delay; + unsigned long ns, us; + u32 nents; + + nents = dw_readl(dws, DW_SPI_TXFLR); + ns = NSEC_PER_SEC / dws->current_freq * nents; + ns *= dws->n_bytes * BITS_PER_BYTE; + if (ns <= NSEC_PER_USEC) { + delay.unit = SPI_DELAY_UNIT_NSECS; + delay.value = ns; + } else { + us = DIV_ROUND_UP(ns, NSEC_PER_USEC); + delay.unit = SPI_DELAY_UNIT_USECS; + delay.value = clamp_val(us, 0, USHRT_MAX); + } + + while (dw_spi_ctlr_busy(dws) && retry--) + spi_delay_exec(&delay, NULL); + + if (retry < 0) { + dev_err(&dws->master->dev, "Mem op hanged up\n"); + return -EIO; + } + + return 0; +} + +static void dw_spi_stop_mem_op(struct dw_spi *dws, struct spi_device *spi) +{ + spi_enable_chip(dws, 0); + dw_spi_set_cs(spi, true); + spi_enable_chip(dws, 1); +} + +/* + * The SPI memory operation implementation below is the best choice for the + * devices, which are selected by the native chip-select lane. It's + * specifically developed to workaround the problem with automatic chip-select + * lane toggle when there is no data in the Tx FIFO buffer. Luckily the current + * SPI-mem core calls exec_op() callback only if the GPIO-based CS is + * unavailable. + */ +static int dw_spi_exec_mem_op(struct spi_mem *mem, const struct spi_mem_op *op) +{ + struct dw_spi *dws = spi_controller_get_devdata(mem->spi->controller); + struct dw_spi_cfg cfg; + unsigned long flags; + int ret; + + /* + * Collect the outbound data into a single buffer to speed the + * transmission up at least on the initial stage. + */ + ret = dw_spi_init_mem_buf(dws, op); + if (ret) + return ret; + + /* + * DW SPI EEPROM-read mode is required only for the SPI memory Data-IN + * operation. Transmit-only mode is suitable for the rest of them. + */ + cfg.dfs = 8; + cfg.freq = clamp(mem->spi->max_speed_hz, 0U, dws->max_mem_freq); + if (op->data.dir == SPI_MEM_DATA_IN) { + cfg.tmode = SPI_TMOD_EPROMREAD; + cfg.ndf = op->data.nbytes; + } else { + cfg.tmode = SPI_TMOD_TO; + } + + spi_enable_chip(dws, 0); + + dw_spi_update_config(dws, mem->spi, &cfg); + + spi_mask_intr(dws, 0xff); + + spi_enable_chip(dws, 1); + + /* + * DW APB SSI controller has very nasty peculiarities. First originally + * (without any vendor-specific modifications) it doesn't provide a + * direct way to set and clear the native chip-select signal. Instead + * the controller asserts the CS lane if Tx FIFO isn't empty and a + * transmission is going on, and automatically de-asserts it back to + * the high level if the Tx FIFO doesn't have anything to be pushed + * out. Due to that a multi-tasking or heavy IRQs activity might be + * fatal, since the transfer procedure preemption may cause the Tx FIFO + * getting empty and sudden CS de-assertion, which in the middle of the + * transfer will most likely cause the data loss. Secondly the + * EEPROM-read or Read-only DW SPI transfer modes imply the incoming + * data being automatically pulled in into the Rx FIFO. So if the + * driver software is late in fetching the data from the FIFO before + * it's overflown, new incoming data will be lost. In order to make + * sure the executed memory operations are CS-atomic and to prevent the + * Rx FIFO overflow we have to disable the local interrupts so to block + * any preemption during the subsequent IO operations. + * + * Note. At some circumstances disabling IRQs may not help to prevent + * the problems described above. The CS de-assertion and Rx FIFO + * overflow may still happen due to the relatively slow system bus or + * CPU not working fast enough, so the write-then-read algo implemented + * here just won't keep up with the SPI bus data transfer. Such + * situation is highly platform specific and is supposed to be fixed by + * manually restricting the SPI bus frequency using the + * dws->max_mem_freq parameter. + */ + local_irq_save(flags); + preempt_disable(); + + ret = dw_spi_write_then_read(dws, mem->spi); + + local_irq_restore(flags); + preempt_enable(); + + /* + * Wait for the operation being finished and check the controller + * status only if there hasn't been any run-time error detected. In the + * former case it's just pointless. In the later one to prevent an + * additional error message printing since any hw error flag being set + * would be due to an error detected on the data transfer. + */ + if (!ret) { + ret = dw_spi_wait_mem_op_done(dws); + if (!ret) + ret = dw_spi_check_status(dws, true); + } + + dw_spi_stop_mem_op(dws, mem->spi); + + dw_spi_free_mem_buf(dws); + + return ret; +} + +/* + * Initialize the default memory operations if a glue layer hasn't specified + * custom ones. Direct mapping operations will be preserved anyway since DW SPI + * controller doesn't have an embedded dirmap interface. Note the memory + * operations implemented in this driver is the best choice only for the DW APB + * SSI controller with standard native CS functionality. If a hardware vendor + * has fixed the automatic CS assertion/de-assertion peculiarity, then it will + * be safer to use the normal SPI-messages-based transfers implementation. + */ +static void dw_spi_init_mem_ops(struct dw_spi *dws) +{ + if (!dws->mem_ops.exec_op && !(dws->caps & DW_SPI_CAP_CS_OVERRIDE) && + !dws->set_cs) { + dws->mem_ops.adjust_op_size = dw_spi_adjust_mem_op_size; + dws->mem_ops.supports_op = dw_spi_supports_mem_op; + dws->mem_ops.exec_op = dw_spi_exec_mem_op; + if (!dws->max_mem_freq) + dws->max_mem_freq = dws->max_freq; + } +} + +/* This may be called twice for each spi dev */ +static int dw_spi_setup(struct spi_device *spi) +{ + struct dw_spi *dws = spi_controller_get_devdata(spi->controller); + struct chip_data *chip; + + /* Only alloc on first setup */ + chip = spi_get_ctldata(spi); + if (!chip) { + struct dw_spi *dws = spi_controller_get_devdata(spi->controller); + u32 rx_sample_dly_ns; + + chip = kzalloc(sizeof(struct chip_data), GFP_KERNEL); + if (!chip) + return -ENOMEM; + spi_set_ctldata(spi, chip); + /* Get specific / default rx-sample-delay */ + if (device_property_read_u32(&spi->dev, + "rx-sample-delay-ns", + &rx_sample_dly_ns) != 0) + /* Use default controller value */ + rx_sample_dly_ns = dws->def_rx_sample_dly_ns; + chip->rx_sample_dly = DIV_ROUND_CLOSEST(rx_sample_dly_ns, + NSEC_PER_SEC / + dws->max_freq); + } + + /* + * Update CR0 data each time the setup callback is invoked since + * the device parameters could have been changed, for instance, by + * the MMC SPI driver or something else. + */ + chip->cr0 = dw_spi_prepare_cr0(dws, spi); + + return 0; +} + +static void dw_spi_cleanup(struct spi_device *spi) +{ + struct chip_data *chip = spi_get_ctldata(spi); + + kfree(chip); + spi_set_ctldata(spi, NULL); +} + +/* Restart the controller, disable all interrupts, clean rx fifo */ +static void spi_hw_init(struct device *dev, struct dw_spi *dws) +{ + spi_reset_chip(dws); + + /* + * Try to detect the FIFO depth if not set by interface driver, + * the depth could be from 2 to 256 from HW spec + */ + if (!dws->fifo_len) { + u32 fifo; + + for (fifo = 1; fifo < 256; fifo++) { + dw_writel(dws, DW_SPI_TXFTLR, fifo); + if (fifo != dw_readl(dws, DW_SPI_TXFTLR)) + break; + } + dw_writel(dws, DW_SPI_TXFTLR, 0); + + dws->fifo_len = (fifo == 1) ? 0 : fifo; + dev_dbg(dev, "Detected FIFO size: %u bytes\n", dws->fifo_len); + } + + /* enable HW fixup for explicit CS deselect for Amazon's alpine chip */ + if (dws->caps & DW_SPI_CAP_CS_OVERRIDE) + dw_writel(dws, DW_SPI_CS_OVERRIDE, 0xF); +} + +int dw_spi_add_host(struct device *dev, struct dw_spi *dws) +{ + struct spi_controller *master; + int ret; + + if (!dws) + return -EINVAL; + + master = spi_alloc_master(dev, 0); + if (!master) + return -ENOMEM; + + dws->master = master; + dws->dma_addr = (dma_addr_t)(dws->paddr + DW_SPI_DR); + + spi_controller_set_devdata(master, dws); + + /* Basic HW init */ + spi_hw_init(dev, dws); + + ret = request_irq(dws->irq, dw_spi_irq, IRQF_SHARED, dev_name(dev), + master); + if (ret < 0 && ret != -ENOTCONN) { + dev_err(dev, "can not get IRQ\n"); + goto err_free_master; + } + + dw_spi_init_mem_ops(dws); + + master->use_gpio_descriptors = true; + master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_LOOP; + master->bits_per_word_mask = SPI_BPW_RANGE_MASK(4, 16); + master->bus_num = dws->bus_num; + master->num_chipselect = dws->num_cs; + master->setup = dw_spi_setup; + master->cleanup = dw_spi_cleanup; + if (dws->set_cs) + master->set_cs = dws->set_cs; + else + master->set_cs = dw_spi_set_cs; + master->transfer_one = dw_spi_transfer_one; + master->handle_err = dw_spi_handle_err; + if (dws->mem_ops.exec_op) + master->mem_ops = &dws->mem_ops; + master->max_speed_hz = dws->max_freq; + master->dev.of_node = dev->of_node; + master->dev.fwnode = dev->fwnode; + master->flags = SPI_MASTER_GPIO_SS; + master->auto_runtime_pm = true; + + /* Get default rx sample delay */ + device_property_read_u32(dev, "rx-sample-delay-ns", + &dws->def_rx_sample_dly_ns); + + if (dws->dma_ops && dws->dma_ops->dma_init) { + ret = dws->dma_ops->dma_init(dev, dws); + if (ret) { + dev_warn(dev, "DMA init failed\n"); + } else { + master->can_dma = dws->dma_ops->can_dma; + master->flags |= SPI_CONTROLLER_MUST_TX; + } + } + + ret = spi_register_controller(master); + if (ret) { + dev_err(&master->dev, "problem registering spi master\n"); + goto err_dma_exit; + } + + dw_spi_debugfs_init(dws); + return 0; + +err_dma_exit: + if (dws->dma_ops && dws->dma_ops->dma_exit) + dws->dma_ops->dma_exit(dws); + spi_enable_chip(dws, 0); + free_irq(dws->irq, master); +err_free_master: + spi_controller_put(master); + return ret; +} +EXPORT_SYMBOL_GPL(dw_spi_add_host); + +void dw_spi_remove_host(struct dw_spi *dws) +{ + dw_spi_debugfs_remove(dws); + + spi_unregister_controller(dws->master); + + if (dws->dma_ops && dws->dma_ops->dma_exit) + dws->dma_ops->dma_exit(dws); + + spi_shutdown_chip(dws); + + free_irq(dws->irq, dws->master); +} +EXPORT_SYMBOL_GPL(dw_spi_remove_host); + +int dw_spi_suspend_host(struct dw_spi *dws) +{ + int ret; + + ret = spi_controller_suspend(dws->master); + if (ret) + return ret; + + spi_shutdown_chip(dws); + return 0; +} +EXPORT_SYMBOL_GPL(dw_spi_suspend_host); + +int dw_spi_resume_host(struct dw_spi *dws) +{ + spi_hw_init(&dws->master->dev, dws); + return spi_controller_resume(dws->master); +} +EXPORT_SYMBOL_GPL(dw_spi_resume_host); + +MODULE_AUTHOR("Feng Tang <feng.tang@intel.com>"); +MODULE_DESCRIPTION("Driver for DesignWare SPI controller core"); +MODULE_LICENSE("GPL v2"); diff --git a/drivers/spi/spi-dw-dma.c b/drivers/spi/spi-dw-dma.c new file mode 100644 index 000000000..32ac8f906 --- /dev/null +++ b/drivers/spi/spi-dw-dma.c @@ -0,0 +1,659 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Special handling for DW DMA core + * + * Copyright (c) 2009, 2014 Intel Corporation. + */ + +#include <linux/completion.h> +#include <linux/dma-mapping.h> +#include <linux/dmaengine.h> +#include <linux/irqreturn.h> +#include <linux/jiffies.h> +#include <linux/pci.h> +#include <linux/platform_data/dma-dw.h> +#include <linux/spi/spi.h> +#include <linux/types.h> + +#include "spi-dw.h" + +#define RX_BUSY 0 +#define RX_BURST_LEVEL 16 +#define TX_BUSY 1 +#define TX_BURST_LEVEL 16 + +static bool dw_spi_dma_chan_filter(struct dma_chan *chan, void *param) +{ + struct dw_dma_slave *s = param; + + if (s->dma_dev != chan->device->dev) + return false; + + chan->private = s; + return true; +} + +static void dw_spi_dma_maxburst_init(struct dw_spi *dws) +{ + struct dma_slave_caps caps; + u32 max_burst, def_burst; + int ret; + + def_burst = dws->fifo_len / 2; + + ret = dma_get_slave_caps(dws->rxchan, &caps); + if (!ret && caps.max_burst) + max_burst = caps.max_burst; + else + max_burst = RX_BURST_LEVEL; + + dws->rxburst = min(max_burst, def_burst); + dw_writel(dws, DW_SPI_DMARDLR, dws->rxburst - 1); + + ret = dma_get_slave_caps(dws->txchan, &caps); + if (!ret && caps.max_burst) + max_burst = caps.max_burst; + else + max_burst = TX_BURST_LEVEL; + + /* + * Having a Rx DMA channel serviced with higher priority than a Tx DMA + * channel might not be enough to provide a well balanced DMA-based + * SPI transfer interface. There might still be moments when the Tx DMA + * channel is occasionally handled faster than the Rx DMA channel. + * That in its turn will eventually cause the SPI Rx FIFO overflow if + * SPI bus speed is high enough to fill the SPI Rx FIFO in before it's + * cleared by the Rx DMA channel. In order to fix the problem the Tx + * DMA activity is intentionally slowed down by limiting the SPI Tx + * FIFO depth with a value twice bigger than the Tx burst length. + */ + dws->txburst = min(max_burst, def_burst); + dw_writel(dws, DW_SPI_DMATDLR, dws->txburst); +} + +static void dw_spi_dma_sg_burst_init(struct dw_spi *dws) +{ + struct dma_slave_caps tx = {0}, rx = {0}; + + dma_get_slave_caps(dws->txchan, &tx); + dma_get_slave_caps(dws->rxchan, &rx); + + if (tx.max_sg_burst > 0 && rx.max_sg_burst > 0) + dws->dma_sg_burst = min(tx.max_sg_burst, rx.max_sg_burst); + else if (tx.max_sg_burst > 0) + dws->dma_sg_burst = tx.max_sg_burst; + else if (rx.max_sg_burst > 0) + dws->dma_sg_burst = rx.max_sg_burst; + else + dws->dma_sg_burst = 0; +} + +static int dw_spi_dma_init_mfld(struct device *dev, struct dw_spi *dws) +{ + struct dw_dma_slave dma_tx = { .dst_id = 1 }, *tx = &dma_tx; + struct dw_dma_slave dma_rx = { .src_id = 0 }, *rx = &dma_rx; + struct pci_dev *dma_dev; + dma_cap_mask_t mask; + + /* + * Get pci device for DMA controller, currently it could only + * be the DMA controller of Medfield + */ + dma_dev = pci_get_device(PCI_VENDOR_ID_INTEL, 0x0827, NULL); + if (!dma_dev) + return -ENODEV; + + dma_cap_zero(mask); + dma_cap_set(DMA_SLAVE, mask); + + /* 1. Init rx channel */ + rx->dma_dev = &dma_dev->dev; + dws->rxchan = dma_request_channel(mask, dw_spi_dma_chan_filter, rx); + if (!dws->rxchan) + goto err_exit; + + /* 2. Init tx channel */ + tx->dma_dev = &dma_dev->dev; + dws->txchan = dma_request_channel(mask, dw_spi_dma_chan_filter, tx); + if (!dws->txchan) + goto free_rxchan; + + dws->master->dma_rx = dws->rxchan; + dws->master->dma_tx = dws->txchan; + + init_completion(&dws->dma_completion); + + dw_spi_dma_maxburst_init(dws); + + dw_spi_dma_sg_burst_init(dws); + + pci_dev_put(dma_dev); + + return 0; + +free_rxchan: + dma_release_channel(dws->rxchan); + dws->rxchan = NULL; +err_exit: + pci_dev_put(dma_dev); + return -EBUSY; +} + +static int dw_spi_dma_init_generic(struct device *dev, struct dw_spi *dws) +{ + dws->rxchan = dma_request_slave_channel(dev, "rx"); + if (!dws->rxchan) + return -ENODEV; + + dws->txchan = dma_request_slave_channel(dev, "tx"); + if (!dws->txchan) { + dma_release_channel(dws->rxchan); + dws->rxchan = NULL; + return -ENODEV; + } + + dws->master->dma_rx = dws->rxchan; + dws->master->dma_tx = dws->txchan; + + init_completion(&dws->dma_completion); + + dw_spi_dma_maxburst_init(dws); + + dw_spi_dma_sg_burst_init(dws); + + return 0; +} + +static void dw_spi_dma_exit(struct dw_spi *dws) +{ + if (dws->txchan) { + dmaengine_terminate_sync(dws->txchan); + dma_release_channel(dws->txchan); + } + + if (dws->rxchan) { + dmaengine_terminate_sync(dws->rxchan); + dma_release_channel(dws->rxchan); + } +} + +static irqreturn_t dw_spi_dma_transfer_handler(struct dw_spi *dws) +{ + dw_spi_check_status(dws, false); + + complete(&dws->dma_completion); + + return IRQ_HANDLED; +} + +static bool dw_spi_can_dma(struct spi_controller *master, + struct spi_device *spi, struct spi_transfer *xfer) +{ + struct dw_spi *dws = spi_controller_get_devdata(master); + + return xfer->len > dws->fifo_len; +} + +static enum dma_slave_buswidth dw_spi_dma_convert_width(u8 n_bytes) +{ + if (n_bytes == 1) + return DMA_SLAVE_BUSWIDTH_1_BYTE; + else if (n_bytes == 2) + return DMA_SLAVE_BUSWIDTH_2_BYTES; + + return DMA_SLAVE_BUSWIDTH_UNDEFINED; +} + +static int dw_spi_dma_wait(struct dw_spi *dws, unsigned int len, u32 speed) +{ + unsigned long long ms; + + ms = len * MSEC_PER_SEC * BITS_PER_BYTE; + do_div(ms, speed); + ms += ms + 200; + + if (ms > UINT_MAX) + ms = UINT_MAX; + + ms = wait_for_completion_timeout(&dws->dma_completion, + msecs_to_jiffies(ms)); + + if (ms == 0) { + dev_err(&dws->master->cur_msg->spi->dev, + "DMA transaction timed out\n"); + return -ETIMEDOUT; + } + + return 0; +} + +static inline bool dw_spi_dma_tx_busy(struct dw_spi *dws) +{ + return !(dw_readl(dws, DW_SPI_SR) & SR_TF_EMPT); +} + +static int dw_spi_dma_wait_tx_done(struct dw_spi *dws, + struct spi_transfer *xfer) +{ + int retry = SPI_WAIT_RETRIES; + struct spi_delay delay; + u32 nents; + + nents = dw_readl(dws, DW_SPI_TXFLR); + delay.unit = SPI_DELAY_UNIT_SCK; + delay.value = nents * dws->n_bytes * BITS_PER_BYTE; + + while (dw_spi_dma_tx_busy(dws) && retry--) + spi_delay_exec(&delay, xfer); + + if (retry < 0) { + dev_err(&dws->master->dev, "Tx hanged up\n"); + return -EIO; + } + + return 0; +} + +/* + * dws->dma_chan_busy is set before the dma transfer starts, callback for tx + * channel will clear a corresponding bit. + */ +static void dw_spi_dma_tx_done(void *arg) +{ + struct dw_spi *dws = arg; + + clear_bit(TX_BUSY, &dws->dma_chan_busy); + if (test_bit(RX_BUSY, &dws->dma_chan_busy)) + return; + + complete(&dws->dma_completion); +} + +static int dw_spi_dma_config_tx(struct dw_spi *dws) +{ + struct dma_slave_config txconf; + + memset(&txconf, 0, sizeof(txconf)); + txconf.direction = DMA_MEM_TO_DEV; + txconf.dst_addr = dws->dma_addr; + txconf.dst_maxburst = dws->txburst; + txconf.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES; + txconf.dst_addr_width = dw_spi_dma_convert_width(dws->n_bytes); + txconf.device_fc = false; + + return dmaengine_slave_config(dws->txchan, &txconf); +} + +static int dw_spi_dma_submit_tx(struct dw_spi *dws, struct scatterlist *sgl, + unsigned int nents) +{ + struct dma_async_tx_descriptor *txdesc; + dma_cookie_t cookie; + int ret; + + txdesc = dmaengine_prep_slave_sg(dws->txchan, sgl, nents, + DMA_MEM_TO_DEV, + DMA_PREP_INTERRUPT | DMA_CTRL_ACK); + if (!txdesc) + return -ENOMEM; + + txdesc->callback = dw_spi_dma_tx_done; + txdesc->callback_param = dws; + + cookie = dmaengine_submit(txdesc); + ret = dma_submit_error(cookie); + if (ret) { + dmaengine_terminate_sync(dws->txchan); + return ret; + } + + set_bit(TX_BUSY, &dws->dma_chan_busy); + + return 0; +} + +static inline bool dw_spi_dma_rx_busy(struct dw_spi *dws) +{ + return !!(dw_readl(dws, DW_SPI_SR) & SR_RF_NOT_EMPT); +} + +static int dw_spi_dma_wait_rx_done(struct dw_spi *dws) +{ + int retry = SPI_WAIT_RETRIES; + struct spi_delay delay; + unsigned long ns, us; + u32 nents; + + /* + * It's unlikely that DMA engine is still doing the data fetching, but + * if it's let's give it some reasonable time. The timeout calculation + * is based on the synchronous APB/SSI reference clock rate, on a + * number of data entries left in the Rx FIFO, times a number of clock + * periods normally needed for a single APB read/write transaction + * without PREADY signal utilized (which is true for the DW APB SSI + * controller). + */ + nents = dw_readl(dws, DW_SPI_RXFLR); + ns = 4U * NSEC_PER_SEC / dws->max_freq * nents; + if (ns <= NSEC_PER_USEC) { + delay.unit = SPI_DELAY_UNIT_NSECS; + delay.value = ns; + } else { + us = DIV_ROUND_UP(ns, NSEC_PER_USEC); + delay.unit = SPI_DELAY_UNIT_USECS; + delay.value = clamp_val(us, 0, USHRT_MAX); + } + + while (dw_spi_dma_rx_busy(dws) && retry--) + spi_delay_exec(&delay, NULL); + + if (retry < 0) { + dev_err(&dws->master->dev, "Rx hanged up\n"); + return -EIO; + } + + return 0; +} + +/* + * dws->dma_chan_busy is set before the dma transfer starts, callback for rx + * channel will clear a corresponding bit. + */ +static void dw_spi_dma_rx_done(void *arg) +{ + struct dw_spi *dws = arg; + + clear_bit(RX_BUSY, &dws->dma_chan_busy); + if (test_bit(TX_BUSY, &dws->dma_chan_busy)) + return; + + complete(&dws->dma_completion); +} + +static int dw_spi_dma_config_rx(struct dw_spi *dws) +{ + struct dma_slave_config rxconf; + + memset(&rxconf, 0, sizeof(rxconf)); + rxconf.direction = DMA_DEV_TO_MEM; + rxconf.src_addr = dws->dma_addr; + rxconf.src_maxburst = dws->rxburst; + rxconf.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES; + rxconf.src_addr_width = dw_spi_dma_convert_width(dws->n_bytes); + rxconf.device_fc = false; + + return dmaengine_slave_config(dws->rxchan, &rxconf); +} + +static int dw_spi_dma_submit_rx(struct dw_spi *dws, struct scatterlist *sgl, + unsigned int nents) +{ + struct dma_async_tx_descriptor *rxdesc; + dma_cookie_t cookie; + int ret; + + rxdesc = dmaengine_prep_slave_sg(dws->rxchan, sgl, nents, + DMA_DEV_TO_MEM, + DMA_PREP_INTERRUPT | DMA_CTRL_ACK); + if (!rxdesc) + return -ENOMEM; + + rxdesc->callback = dw_spi_dma_rx_done; + rxdesc->callback_param = dws; + + cookie = dmaengine_submit(rxdesc); + ret = dma_submit_error(cookie); + if (ret) { + dmaengine_terminate_sync(dws->rxchan); + return ret; + } + + set_bit(RX_BUSY, &dws->dma_chan_busy); + + return 0; +} + +static int dw_spi_dma_setup(struct dw_spi *dws, struct spi_transfer *xfer) +{ + u16 imr, dma_ctrl; + int ret; + + if (!xfer->tx_buf) + return -EINVAL; + + /* Setup DMA channels */ + ret = dw_spi_dma_config_tx(dws); + if (ret) + return ret; + + if (xfer->rx_buf) { + ret = dw_spi_dma_config_rx(dws); + if (ret) + return ret; + } + + /* Set the DMA handshaking interface */ + dma_ctrl = SPI_DMA_TDMAE; + if (xfer->rx_buf) + dma_ctrl |= SPI_DMA_RDMAE; + dw_writel(dws, DW_SPI_DMACR, dma_ctrl); + + /* Set the interrupt mask */ + imr = SPI_INT_TXOI; + if (xfer->rx_buf) + imr |= SPI_INT_RXUI | SPI_INT_RXOI; + spi_umask_intr(dws, imr); + + reinit_completion(&dws->dma_completion); + + dws->transfer_handler = dw_spi_dma_transfer_handler; + + return 0; +} + +static int dw_spi_dma_transfer_all(struct dw_spi *dws, + struct spi_transfer *xfer) +{ + int ret; + + /* Submit the DMA Tx transfer */ + ret = dw_spi_dma_submit_tx(dws, xfer->tx_sg.sgl, xfer->tx_sg.nents); + if (ret) + goto err_clear_dmac; + + /* Submit the DMA Rx transfer if required */ + if (xfer->rx_buf) { + ret = dw_spi_dma_submit_rx(dws, xfer->rx_sg.sgl, + xfer->rx_sg.nents); + if (ret) + goto err_clear_dmac; + + /* rx must be started before tx due to spi instinct */ + dma_async_issue_pending(dws->rxchan); + } + + dma_async_issue_pending(dws->txchan); + + ret = dw_spi_dma_wait(dws, xfer->len, xfer->effective_speed_hz); + +err_clear_dmac: + dw_writel(dws, DW_SPI_DMACR, 0); + + return ret; +} + +/* + * In case if at least one of the requested DMA channels doesn't support the + * hardware accelerated SG list entries traverse, the DMA driver will most + * likely work that around by performing the IRQ-based SG list entries + * resubmission. That might and will cause a problem if the DMA Tx channel is + * recharged and re-executed before the Rx DMA channel. Due to + * non-deterministic IRQ-handler execution latency the DMA Tx channel will + * start pushing data to the SPI bus before the Rx DMA channel is even + * reinitialized with the next inbound SG list entry. By doing so the DMA Tx + * channel will implicitly start filling the DW APB SSI Rx FIFO up, which while + * the DMA Rx channel being recharged and re-executed will eventually be + * overflown. + * + * In order to solve the problem we have to feed the DMA engine with SG list + * entries one-by-one. It shall keep the DW APB SSI Tx and Rx FIFOs + * synchronized and prevent the Rx FIFO overflow. Since in general the tx_sg + * and rx_sg lists may have different number of entries of different lengths + * (though total length should match) let's virtually split the SG-lists to the + * set of DMA transfers, which length is a minimum of the ordered SG-entries + * lengths. An ASCII-sketch of the implemented algo is following: + * xfer->len + * |___________| + * tx_sg list: |___|____|__| + * rx_sg list: |_|____|____| + * DMA transfers: |_|_|__|_|__| + * + * Note in order to have this workaround solving the denoted problem the DMA + * engine driver should properly initialize the max_sg_burst capability and set + * the DMA device max segment size parameter with maximum data block size the + * DMA engine supports. + */ + +static int dw_spi_dma_transfer_one(struct dw_spi *dws, + struct spi_transfer *xfer) +{ + struct scatterlist *tx_sg = NULL, *rx_sg = NULL, tx_tmp, rx_tmp; + unsigned int tx_len = 0, rx_len = 0; + unsigned int base, len; + int ret; + + sg_init_table(&tx_tmp, 1); + sg_init_table(&rx_tmp, 1); + + for (base = 0, len = 0; base < xfer->len; base += len) { + /* Fetch next Tx DMA data chunk */ + if (!tx_len) { + tx_sg = !tx_sg ? &xfer->tx_sg.sgl[0] : sg_next(tx_sg); + sg_dma_address(&tx_tmp) = sg_dma_address(tx_sg); + tx_len = sg_dma_len(tx_sg); + } + + /* Fetch next Rx DMA data chunk */ + if (!rx_len) { + rx_sg = !rx_sg ? &xfer->rx_sg.sgl[0] : sg_next(rx_sg); + sg_dma_address(&rx_tmp) = sg_dma_address(rx_sg); + rx_len = sg_dma_len(rx_sg); + } + + len = min(tx_len, rx_len); + + sg_dma_len(&tx_tmp) = len; + sg_dma_len(&rx_tmp) = len; + + /* Submit DMA Tx transfer */ + ret = dw_spi_dma_submit_tx(dws, &tx_tmp, 1); + if (ret) + break; + + /* Submit DMA Rx transfer */ + ret = dw_spi_dma_submit_rx(dws, &rx_tmp, 1); + if (ret) + break; + + /* Rx must be started before Tx due to SPI instinct */ + dma_async_issue_pending(dws->rxchan); + + dma_async_issue_pending(dws->txchan); + + /* + * Here we only need to wait for the DMA transfer to be + * finished since SPI controller is kept enabled during the + * procedure this loop implements and there is no risk to lose + * data left in the Tx/Rx FIFOs. + */ + ret = dw_spi_dma_wait(dws, len, xfer->effective_speed_hz); + if (ret) + break; + + reinit_completion(&dws->dma_completion); + + sg_dma_address(&tx_tmp) += len; + sg_dma_address(&rx_tmp) += len; + tx_len -= len; + rx_len -= len; + } + + dw_writel(dws, DW_SPI_DMACR, 0); + + return ret; +} + +static int dw_spi_dma_transfer(struct dw_spi *dws, struct spi_transfer *xfer) +{ + unsigned int nents; + int ret; + + nents = max(xfer->tx_sg.nents, xfer->rx_sg.nents); + + /* + * Execute normal DMA-based transfer (which submits the Rx and Tx SG + * lists directly to the DMA engine at once) if either full hardware + * accelerated SG list traverse is supported by both channels, or the + * Tx-only SPI transfer is requested, or the DMA engine is capable to + * handle both SG lists on hardware accelerated basis. + */ + if (!dws->dma_sg_burst || !xfer->rx_buf || nents <= dws->dma_sg_burst) + ret = dw_spi_dma_transfer_all(dws, xfer); + else + ret = dw_spi_dma_transfer_one(dws, xfer); + if (ret) + return ret; + + if (dws->master->cur_msg->status == -EINPROGRESS) { + ret = dw_spi_dma_wait_tx_done(dws, xfer); + if (ret) + return ret; + } + + if (xfer->rx_buf && dws->master->cur_msg->status == -EINPROGRESS) + ret = dw_spi_dma_wait_rx_done(dws); + + return ret; +} + +static void dw_spi_dma_stop(struct dw_spi *dws) +{ + if (test_bit(TX_BUSY, &dws->dma_chan_busy)) { + dmaengine_terminate_sync(dws->txchan); + clear_bit(TX_BUSY, &dws->dma_chan_busy); + } + if (test_bit(RX_BUSY, &dws->dma_chan_busy)) { + dmaengine_terminate_sync(dws->rxchan); + clear_bit(RX_BUSY, &dws->dma_chan_busy); + } +} + +static const struct dw_spi_dma_ops dw_spi_dma_mfld_ops = { + .dma_init = dw_spi_dma_init_mfld, + .dma_exit = dw_spi_dma_exit, + .dma_setup = dw_spi_dma_setup, + .can_dma = dw_spi_can_dma, + .dma_transfer = dw_spi_dma_transfer, + .dma_stop = dw_spi_dma_stop, +}; + +void dw_spi_dma_setup_mfld(struct dw_spi *dws) +{ + dws->dma_ops = &dw_spi_dma_mfld_ops; +} +EXPORT_SYMBOL_GPL(dw_spi_dma_setup_mfld); + +static const struct dw_spi_dma_ops dw_spi_dma_generic_ops = { + .dma_init = dw_spi_dma_init_generic, + .dma_exit = dw_spi_dma_exit, + .dma_setup = dw_spi_dma_setup, + .can_dma = dw_spi_can_dma, + .dma_transfer = dw_spi_dma_transfer, + .dma_stop = dw_spi_dma_stop, +}; + +void dw_spi_dma_setup_generic(struct dw_spi *dws) +{ + dws->dma_ops = &dw_spi_dma_generic_ops; +} +EXPORT_SYMBOL_GPL(dw_spi_dma_setup_generic); diff --git a/drivers/spi/spi-dw-mmio.c b/drivers/spi/spi-dw-mmio.c new file mode 100644 index 000000000..d0cc5bf4f --- /dev/null +++ b/drivers/spi/spi-dw-mmio.c @@ -0,0 +1,363 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Memory-mapped interface driver for DW SPI Core + * + * Copyright (c) 2010, Octasic semiconductor. + */ + +#include <linux/clk.h> +#include <linux/err.h> +#include <linux/platform_device.h> +#include <linux/pm_runtime.h> +#include <linux/slab.h> +#include <linux/spi/spi.h> +#include <linux/scatterlist.h> +#include <linux/mfd/syscon.h> +#include <linux/module.h> +#include <linux/of.h> +#include <linux/of_platform.h> +#include <linux/acpi.h> +#include <linux/property.h> +#include <linux/regmap.h> +#include <linux/reset.h> + +#include "spi-dw.h" + +#define DRIVER_NAME "dw_spi_mmio" + +struct dw_spi_mmio { + struct dw_spi dws; + struct clk *clk; + struct clk *pclk; + void *priv; + struct reset_control *rstc; +}; + +#define MSCC_CPU_SYSTEM_CTRL_GENERAL_CTRL 0x24 +#define OCELOT_IF_SI_OWNER_OFFSET 4 +#define JAGUAR2_IF_SI_OWNER_OFFSET 6 +#define MSCC_IF_SI_OWNER_MASK GENMASK(1, 0) +#define MSCC_IF_SI_OWNER_SISL 0 +#define MSCC_IF_SI_OWNER_SIBM 1 +#define MSCC_IF_SI_OWNER_SIMC 2 + +#define MSCC_SPI_MST_SW_MODE 0x14 +#define MSCC_SPI_MST_SW_MODE_SW_PIN_CTRL_MODE BIT(13) +#define MSCC_SPI_MST_SW_MODE_SW_SPI_CS(x) (x << 5) + +#define SPARX5_FORCE_ENA 0xa4 +#define SPARX5_FORCE_VAL 0xa8 + +struct dw_spi_mscc { + struct regmap *syscon; + void __iomem *spi_mst; /* Not sparx5 */ +}; + +/* + * The Designware SPI controller (referred to as master in the documentation) + * automatically deasserts chip select when the tx fifo is empty. The chip + * selects then needs to be either driven as GPIOs or, for the first 4 using the + * the SPI boot controller registers. the final chip select is an OR gate + * between the Designware SPI controller and the SPI boot controller. + */ +static void dw_spi_mscc_set_cs(struct spi_device *spi, bool enable) +{ + struct dw_spi *dws = spi_master_get_devdata(spi->master); + struct dw_spi_mmio *dwsmmio = container_of(dws, struct dw_spi_mmio, dws); + struct dw_spi_mscc *dwsmscc = dwsmmio->priv; + u32 cs = spi->chip_select; + + if (cs < 4) { + u32 sw_mode = MSCC_SPI_MST_SW_MODE_SW_PIN_CTRL_MODE; + + if (!enable) + sw_mode |= MSCC_SPI_MST_SW_MODE_SW_SPI_CS(BIT(cs)); + + writel(sw_mode, dwsmscc->spi_mst + MSCC_SPI_MST_SW_MODE); + } + + dw_spi_set_cs(spi, enable); +} + +static int dw_spi_mscc_init(struct platform_device *pdev, + struct dw_spi_mmio *dwsmmio, + const char *cpu_syscon, u32 if_si_owner_offset) +{ + struct dw_spi_mscc *dwsmscc; + + dwsmscc = devm_kzalloc(&pdev->dev, sizeof(*dwsmscc), GFP_KERNEL); + if (!dwsmscc) + return -ENOMEM; + + dwsmscc->spi_mst = devm_platform_ioremap_resource(pdev, 1); + if (IS_ERR(dwsmscc->spi_mst)) { + dev_err(&pdev->dev, "SPI_MST region map failed\n"); + return PTR_ERR(dwsmscc->spi_mst); + } + + dwsmscc->syscon = syscon_regmap_lookup_by_compatible(cpu_syscon); + if (IS_ERR(dwsmscc->syscon)) + return PTR_ERR(dwsmscc->syscon); + + /* Deassert all CS */ + writel(0, dwsmscc->spi_mst + MSCC_SPI_MST_SW_MODE); + + /* Select the owner of the SI interface */ + regmap_update_bits(dwsmscc->syscon, MSCC_CPU_SYSTEM_CTRL_GENERAL_CTRL, + MSCC_IF_SI_OWNER_MASK << if_si_owner_offset, + MSCC_IF_SI_OWNER_SIMC << if_si_owner_offset); + + dwsmmio->dws.set_cs = dw_spi_mscc_set_cs; + dwsmmio->priv = dwsmscc; + + return 0; +} + +static int dw_spi_mscc_ocelot_init(struct platform_device *pdev, + struct dw_spi_mmio *dwsmmio) +{ + return dw_spi_mscc_init(pdev, dwsmmio, "mscc,ocelot-cpu-syscon", + OCELOT_IF_SI_OWNER_OFFSET); +} + +static int dw_spi_mscc_jaguar2_init(struct platform_device *pdev, + struct dw_spi_mmio *dwsmmio) +{ + return dw_spi_mscc_init(pdev, dwsmmio, "mscc,jaguar2-cpu-syscon", + JAGUAR2_IF_SI_OWNER_OFFSET); +} + +/* + * The Designware SPI controller (referred to as master in the + * documentation) automatically deasserts chip select when the tx fifo + * is empty. The chip selects then needs to be driven by a CS override + * register. enable is an active low signal. + */ +static void dw_spi_sparx5_set_cs(struct spi_device *spi, bool enable) +{ + struct dw_spi *dws = spi_master_get_devdata(spi->master); + struct dw_spi_mmio *dwsmmio = container_of(dws, struct dw_spi_mmio, dws); + struct dw_spi_mscc *dwsmscc = dwsmmio->priv; + u8 cs = spi->chip_select; + + if (!enable) { + /* CS override drive enable */ + regmap_write(dwsmscc->syscon, SPARX5_FORCE_ENA, 1); + /* Now set CSx enabled */ + regmap_write(dwsmscc->syscon, SPARX5_FORCE_VAL, ~BIT(cs)); + /* Allow settle */ + usleep_range(1, 5); + } else { + /* CS value */ + regmap_write(dwsmscc->syscon, SPARX5_FORCE_VAL, ~0); + /* Allow settle */ + usleep_range(1, 5); + /* CS override drive disable */ + regmap_write(dwsmscc->syscon, SPARX5_FORCE_ENA, 0); + } + + dw_spi_set_cs(spi, enable); +} + +static int dw_spi_mscc_sparx5_init(struct platform_device *pdev, + struct dw_spi_mmio *dwsmmio) +{ + const char *syscon_name = "microchip,sparx5-cpu-syscon"; + struct device *dev = &pdev->dev; + struct dw_spi_mscc *dwsmscc; + + if (!IS_ENABLED(CONFIG_SPI_MUX)) { + dev_err(dev, "This driver needs CONFIG_SPI_MUX\n"); + return -EOPNOTSUPP; + } + + dwsmscc = devm_kzalloc(dev, sizeof(*dwsmscc), GFP_KERNEL); + if (!dwsmscc) + return -ENOMEM; + + dwsmscc->syscon = + syscon_regmap_lookup_by_compatible(syscon_name); + if (IS_ERR(dwsmscc->syscon)) { + dev_err(dev, "No syscon map %s\n", syscon_name); + return PTR_ERR(dwsmscc->syscon); + } + + dwsmmio->dws.set_cs = dw_spi_sparx5_set_cs; + dwsmmio->priv = dwsmscc; + + return 0; +} + +static int dw_spi_alpine_init(struct platform_device *pdev, + struct dw_spi_mmio *dwsmmio) +{ + dwsmmio->dws.caps = DW_SPI_CAP_CS_OVERRIDE; + + return 0; +} + +static int dw_spi_dw_apb_init(struct platform_device *pdev, + struct dw_spi_mmio *dwsmmio) +{ + dw_spi_dma_setup_generic(&dwsmmio->dws); + + return 0; +} + +static int dw_spi_dwc_ssi_init(struct platform_device *pdev, + struct dw_spi_mmio *dwsmmio) +{ + dwsmmio->dws.caps = DW_SPI_CAP_DWC_SSI; + + dw_spi_dma_setup_generic(&dwsmmio->dws); + + return 0; +} + +static int dw_spi_keembay_init(struct platform_device *pdev, + struct dw_spi_mmio *dwsmmio) +{ + dwsmmio->dws.caps = DW_SPI_CAP_KEEMBAY_MST | DW_SPI_CAP_DWC_SSI; + + return 0; +} + +static int dw_spi_mmio_probe(struct platform_device *pdev) +{ + int (*init_func)(struct platform_device *pdev, + struct dw_spi_mmio *dwsmmio); + struct dw_spi_mmio *dwsmmio; + struct resource *mem; + struct dw_spi *dws; + int ret; + int num_cs; + + dwsmmio = devm_kzalloc(&pdev->dev, sizeof(struct dw_spi_mmio), + GFP_KERNEL); + if (!dwsmmio) + return -ENOMEM; + + dws = &dwsmmio->dws; + + /* Get basic io resource and map it */ + dws->regs = devm_platform_get_and_ioremap_resource(pdev, 0, &mem); + if (IS_ERR(dws->regs)) + return PTR_ERR(dws->regs); + + dws->paddr = mem->start; + + dws->irq = platform_get_irq(pdev, 0); + if (dws->irq < 0) + return dws->irq; /* -ENXIO */ + + dwsmmio->clk = devm_clk_get(&pdev->dev, NULL); + if (IS_ERR(dwsmmio->clk)) + return PTR_ERR(dwsmmio->clk); + ret = clk_prepare_enable(dwsmmio->clk); + if (ret) + return ret; + + /* Optional clock needed to access the registers */ + dwsmmio->pclk = devm_clk_get_optional(&pdev->dev, "pclk"); + if (IS_ERR(dwsmmio->pclk)) { + ret = PTR_ERR(dwsmmio->pclk); + goto out_clk; + } + ret = clk_prepare_enable(dwsmmio->pclk); + if (ret) + goto out_clk; + + /* find an optional reset controller */ + dwsmmio->rstc = devm_reset_control_get_optional_exclusive(&pdev->dev, "spi"); + if (IS_ERR(dwsmmio->rstc)) { + ret = PTR_ERR(dwsmmio->rstc); + goto out_clk; + } + reset_control_deassert(dwsmmio->rstc); + + dws->bus_num = pdev->id; + + dws->max_freq = clk_get_rate(dwsmmio->clk); + + device_property_read_u32(&pdev->dev, "reg-io-width", &dws->reg_io_width); + + num_cs = 4; + + device_property_read_u32(&pdev->dev, "num-cs", &num_cs); + + dws->num_cs = num_cs; + + init_func = device_get_match_data(&pdev->dev); + if (init_func) { + ret = init_func(pdev, dwsmmio); + if (ret) + goto out; + } + + pm_runtime_enable(&pdev->dev); + + ret = dw_spi_add_host(&pdev->dev, dws); + if (ret) + goto out; + + platform_set_drvdata(pdev, dwsmmio); + return 0; + +out: + pm_runtime_disable(&pdev->dev); + clk_disable_unprepare(dwsmmio->pclk); +out_clk: + clk_disable_unprepare(dwsmmio->clk); + reset_control_assert(dwsmmio->rstc); + + return ret; +} + +static int dw_spi_mmio_remove(struct platform_device *pdev) +{ + struct dw_spi_mmio *dwsmmio = platform_get_drvdata(pdev); + + dw_spi_remove_host(&dwsmmio->dws); + pm_runtime_disable(&pdev->dev); + clk_disable_unprepare(dwsmmio->pclk); + clk_disable_unprepare(dwsmmio->clk); + reset_control_assert(dwsmmio->rstc); + + return 0; +} + +static const struct of_device_id dw_spi_mmio_of_match[] = { + { .compatible = "snps,dw-apb-ssi", .data = dw_spi_dw_apb_init}, + { .compatible = "mscc,ocelot-spi", .data = dw_spi_mscc_ocelot_init}, + { .compatible = "mscc,jaguar2-spi", .data = dw_spi_mscc_jaguar2_init}, + { .compatible = "amazon,alpine-dw-apb-ssi", .data = dw_spi_alpine_init}, + { .compatible = "renesas,rzn1-spi", .data = dw_spi_dw_apb_init}, + { .compatible = "snps,dwc-ssi-1.01a", .data = dw_spi_dwc_ssi_init}, + { .compatible = "intel,keembay-ssi", .data = dw_spi_keembay_init}, + { .compatible = "microchip,sparx5-spi", dw_spi_mscc_sparx5_init}, + { /* end of table */} +}; +MODULE_DEVICE_TABLE(of, dw_spi_mmio_of_match); + +#ifdef CONFIG_ACPI +static const struct acpi_device_id dw_spi_mmio_acpi_match[] = { + {"HISI0173", (kernel_ulong_t)dw_spi_dw_apb_init}, + {}, +}; +MODULE_DEVICE_TABLE(acpi, dw_spi_mmio_acpi_match); +#endif + +static struct platform_driver dw_spi_mmio_driver = { + .probe = dw_spi_mmio_probe, + .remove = dw_spi_mmio_remove, + .driver = { + .name = DRIVER_NAME, + .of_match_table = dw_spi_mmio_of_match, + .acpi_match_table = ACPI_PTR(dw_spi_mmio_acpi_match), + }, +}; +module_platform_driver(dw_spi_mmio_driver); + +MODULE_AUTHOR("Jean-Hugues Deschenes <jean-hugues.deschenes@octasic.com>"); +MODULE_DESCRIPTION("Memory-mapped I/O interface driver for DW SPI Core"); +MODULE_LICENSE("GPL v2"); diff --git a/drivers/spi/spi-dw-pci.c b/drivers/spi/spi-dw-pci.c new file mode 100644 index 000000000..8a91cd581 --- /dev/null +++ b/drivers/spi/spi-dw-pci.c @@ -0,0 +1,215 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * PCI interface driver for DW SPI Core + * + * Copyright (c) 2009, 2014 Intel Corporation. + */ + +#include <linux/pci.h> +#include <linux/pm_runtime.h> +#include <linux/slab.h> +#include <linux/spi/spi.h> +#include <linux/module.h> + +#include "spi-dw.h" + +#define DRIVER_NAME "dw_spi_pci" + +/* HW info for MRST Clk Control Unit, 32b reg per controller */ +#define MRST_SPI_CLK_BASE 100000000 /* 100m */ +#define MRST_CLK_SPI_REG 0xff11d86c +#define CLK_SPI_BDIV_OFFSET 0 +#define CLK_SPI_BDIV_MASK 0x00000007 +#define CLK_SPI_CDIV_OFFSET 9 +#define CLK_SPI_CDIV_MASK 0x00000e00 +#define CLK_SPI_DISABLE_OFFSET 8 + +struct spi_pci_desc { + int (*setup)(struct dw_spi *); + u16 num_cs; + u16 bus_num; + u32 max_freq; +}; + +static int spi_mid_init(struct dw_spi *dws) +{ + void __iomem *clk_reg; + u32 clk_cdiv; + + clk_reg = ioremap(MRST_CLK_SPI_REG, 16); + if (!clk_reg) + return -ENOMEM; + + /* Get SPI controller operating freq info */ + clk_cdiv = readl(clk_reg + dws->bus_num * sizeof(u32)); + clk_cdiv &= CLK_SPI_CDIV_MASK; + clk_cdiv >>= CLK_SPI_CDIV_OFFSET; + dws->max_freq = MRST_SPI_CLK_BASE / (clk_cdiv + 1); + + iounmap(clk_reg); + + dw_spi_dma_setup_mfld(dws); + + return 0; +} + +static int spi_generic_init(struct dw_spi *dws) +{ + dw_spi_dma_setup_generic(dws); + + return 0; +} + +static struct spi_pci_desc spi_pci_mid_desc_1 = { + .setup = spi_mid_init, + .num_cs = 5, + .bus_num = 0, +}; + +static struct spi_pci_desc spi_pci_mid_desc_2 = { + .setup = spi_mid_init, + .num_cs = 2, + .bus_num = 1, +}; + +static struct spi_pci_desc spi_pci_ehl_desc = { + .setup = spi_generic_init, + .num_cs = 2, + .bus_num = -1, + .max_freq = 100000000, +}; + +static int spi_pci_probe(struct pci_dev *pdev, const struct pci_device_id *ent) +{ + struct dw_spi *dws; + struct spi_pci_desc *desc = (struct spi_pci_desc *)ent->driver_data; + int pci_bar = 0; + int ret; + + ret = pcim_enable_device(pdev); + if (ret) + return ret; + + dws = devm_kzalloc(&pdev->dev, sizeof(*dws), GFP_KERNEL); + if (!dws) + return -ENOMEM; + + /* Get basic io resource and map it */ + dws->paddr = pci_resource_start(pdev, pci_bar); + pci_set_master(pdev); + + ret = pcim_iomap_regions(pdev, 1 << pci_bar, pci_name(pdev)); + if (ret) + return ret; + + ret = pci_alloc_irq_vectors(pdev, 1, 1, PCI_IRQ_ALL_TYPES); + if (ret < 0) + return ret; + + dws->regs = pcim_iomap_table(pdev)[pci_bar]; + dws->irq = pci_irq_vector(pdev, 0); + + /* + * Specific handling for platforms, like dma setup, + * clock rate, FIFO depth. + */ + if (desc) { + dws->num_cs = desc->num_cs; + dws->bus_num = desc->bus_num; + dws->max_freq = desc->max_freq; + + if (desc->setup) { + ret = desc->setup(dws); + if (ret) + goto err_free_irq_vectors; + } + } else { + ret = -ENODEV; + goto err_free_irq_vectors; + } + + ret = dw_spi_add_host(&pdev->dev, dws); + if (ret) + goto err_free_irq_vectors; + + /* PCI hook and SPI hook use the same drv data */ + pci_set_drvdata(pdev, dws); + + dev_info(&pdev->dev, "found PCI SPI controller(ID: %04x:%04x)\n", + pdev->vendor, pdev->device); + + pm_runtime_set_autosuspend_delay(&pdev->dev, 1000); + pm_runtime_use_autosuspend(&pdev->dev); + pm_runtime_put_autosuspend(&pdev->dev); + pm_runtime_allow(&pdev->dev); + + return 0; + +err_free_irq_vectors: + pci_free_irq_vectors(pdev); + return ret; +} + +static void spi_pci_remove(struct pci_dev *pdev) +{ + struct dw_spi *dws = pci_get_drvdata(pdev); + + pm_runtime_forbid(&pdev->dev); + pm_runtime_get_noresume(&pdev->dev); + + dw_spi_remove_host(dws); + pci_free_irq_vectors(pdev); +} + +#ifdef CONFIG_PM_SLEEP +static int spi_suspend(struct device *dev) +{ + struct dw_spi *dws = dev_get_drvdata(dev); + + return dw_spi_suspend_host(dws); +} + +static int spi_resume(struct device *dev) +{ + struct dw_spi *dws = dev_get_drvdata(dev); + + return dw_spi_resume_host(dws); +} +#endif + +static SIMPLE_DEV_PM_OPS(dw_spi_pm_ops, spi_suspend, spi_resume); + +static const struct pci_device_id pci_ids[] = { + /* Intel MID platform SPI controller 0 */ + /* + * The access to the device 8086:0801 is disabled by HW, since it's + * exclusively used by SCU to communicate with MSIC. + */ + /* Intel MID platform SPI controller 1 */ + { PCI_VDEVICE(INTEL, 0x0800), (kernel_ulong_t)&spi_pci_mid_desc_1}, + /* Intel MID platform SPI controller 2 */ + { PCI_VDEVICE(INTEL, 0x0812), (kernel_ulong_t)&spi_pci_mid_desc_2}, + /* Intel Elkhart Lake PSE SPI controllers */ + { PCI_VDEVICE(INTEL, 0x4b84), (kernel_ulong_t)&spi_pci_ehl_desc}, + { PCI_VDEVICE(INTEL, 0x4b85), (kernel_ulong_t)&spi_pci_ehl_desc}, + { PCI_VDEVICE(INTEL, 0x4b86), (kernel_ulong_t)&spi_pci_ehl_desc}, + { PCI_VDEVICE(INTEL, 0x4b87), (kernel_ulong_t)&spi_pci_ehl_desc}, + {}, +}; +MODULE_DEVICE_TABLE(pci, pci_ids); + +static struct pci_driver dw_spi_driver = { + .name = DRIVER_NAME, + .id_table = pci_ids, + .probe = spi_pci_probe, + .remove = spi_pci_remove, + .driver = { + .pm = &dw_spi_pm_ops, + }, +}; + +module_pci_driver(dw_spi_driver); + +MODULE_AUTHOR("Feng Tang <feng.tang@intel.com>"); +MODULE_DESCRIPTION("PCI interface driver for DW SPI Core"); +MODULE_LICENSE("GPL v2"); diff --git a/drivers/spi/spi-dw.h b/drivers/spi/spi-dw.h new file mode 100644 index 000000000..faf40cb66 --- /dev/null +++ b/drivers/spi/spi-dw.h @@ -0,0 +1,297 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef DW_SPI_HEADER_H +#define DW_SPI_HEADER_H + +#include <linux/bits.h> +#include <linux/completion.h> +#include <linux/debugfs.h> +#include <linux/irqreturn.h> +#include <linux/io.h> +#include <linux/scatterlist.h> +#include <linux/spi/spi-mem.h> + +/* Register offsets */ +#define DW_SPI_CTRLR0 0x00 +#define DW_SPI_CTRLR1 0x04 +#define DW_SPI_SSIENR 0x08 +#define DW_SPI_MWCR 0x0c +#define DW_SPI_SER 0x10 +#define DW_SPI_BAUDR 0x14 +#define DW_SPI_TXFTLR 0x18 +#define DW_SPI_RXFTLR 0x1c +#define DW_SPI_TXFLR 0x20 +#define DW_SPI_RXFLR 0x24 +#define DW_SPI_SR 0x28 +#define DW_SPI_IMR 0x2c +#define DW_SPI_ISR 0x30 +#define DW_SPI_RISR 0x34 +#define DW_SPI_TXOICR 0x38 +#define DW_SPI_RXOICR 0x3c +#define DW_SPI_RXUICR 0x40 +#define DW_SPI_MSTICR 0x44 +#define DW_SPI_ICR 0x48 +#define DW_SPI_DMACR 0x4c +#define DW_SPI_DMATDLR 0x50 +#define DW_SPI_DMARDLR 0x54 +#define DW_SPI_IDR 0x58 +#define DW_SPI_VERSION 0x5c +#define DW_SPI_DR 0x60 +#define DW_SPI_RX_SAMPLE_DLY 0xf0 +#define DW_SPI_CS_OVERRIDE 0xf4 + +/* Bit fields in CTRLR0 */ +#define SPI_DFS_OFFSET 0 + +#define SPI_FRF_OFFSET 4 +#define SPI_FRF_SPI 0x0 +#define SPI_FRF_SSP 0x1 +#define SPI_FRF_MICROWIRE 0x2 +#define SPI_FRF_RESV 0x3 + +#define SPI_MODE_OFFSET 6 +#define SPI_SCPH_OFFSET 6 +#define SPI_SCOL_OFFSET 7 + +#define SPI_TMOD_OFFSET 8 +#define SPI_TMOD_MASK (0x3 << SPI_TMOD_OFFSET) +#define SPI_TMOD_TR 0x0 /* xmit & recv */ +#define SPI_TMOD_TO 0x1 /* xmit only */ +#define SPI_TMOD_RO 0x2 /* recv only */ +#define SPI_TMOD_EPROMREAD 0x3 /* eeprom read mode */ + +#define SPI_SLVOE_OFFSET 10 +#define SPI_SRL_OFFSET 11 +#define SPI_CFS_OFFSET 12 + +/* Bit fields in CTRLR0 based on DWC_ssi_databook.pdf v1.01a */ +#define DWC_SSI_CTRLR0_SRL_OFFSET 13 +#define DWC_SSI_CTRLR0_TMOD_OFFSET 10 +#define DWC_SSI_CTRLR0_TMOD_MASK GENMASK(11, 10) +#define DWC_SSI_CTRLR0_SCPOL_OFFSET 9 +#define DWC_SSI_CTRLR0_SCPH_OFFSET 8 +#define DWC_SSI_CTRLR0_FRF_OFFSET 6 +#define DWC_SSI_CTRLR0_DFS_OFFSET 0 + +/* + * For Keem Bay, CTRLR0[31] is used to select controller mode. + * 0: SSI is slave + * 1: SSI is master + */ +#define DWC_SSI_CTRLR0_KEEMBAY_MST BIT(31) + +/* Bit fields in CTRLR1 */ +#define SPI_NDF_MASK GENMASK(15, 0) + +/* Bit fields in SR, 7 bits */ +#define SR_MASK 0x7f /* cover 7 bits */ +#define SR_BUSY (1 << 0) +#define SR_TF_NOT_FULL (1 << 1) +#define SR_TF_EMPT (1 << 2) +#define SR_RF_NOT_EMPT (1 << 3) +#define SR_RF_FULL (1 << 4) +#define SR_TX_ERR (1 << 5) +#define SR_DCOL (1 << 6) + +/* Bit fields in ISR, IMR, RISR, 7 bits */ +#define SPI_INT_TXEI (1 << 0) +#define SPI_INT_TXOI (1 << 1) +#define SPI_INT_RXUI (1 << 2) +#define SPI_INT_RXOI (1 << 3) +#define SPI_INT_RXFI (1 << 4) +#define SPI_INT_MSTI (1 << 5) + +/* Bit fields in DMACR */ +#define SPI_DMA_RDMAE (1 << 0) +#define SPI_DMA_TDMAE (1 << 1) + +#define SPI_WAIT_RETRIES 5 +#define SPI_BUF_SIZE \ + (sizeof_field(struct spi_mem_op, cmd.opcode) + \ + sizeof_field(struct spi_mem_op, addr.val) + 256) +#define SPI_GET_BYTE(_val, _idx) \ + ((_val) >> (BITS_PER_BYTE * (_idx)) & 0xff) + +enum dw_ssi_type { + SSI_MOTO_SPI = 0, + SSI_TI_SSP, + SSI_NS_MICROWIRE, +}; + +/* DW SPI capabilities */ +#define DW_SPI_CAP_CS_OVERRIDE BIT(0) +#define DW_SPI_CAP_KEEMBAY_MST BIT(1) +#define DW_SPI_CAP_DWC_SSI BIT(2) + +/* Slave spi_transfer/spi_mem_op related */ +struct dw_spi_cfg { + u8 tmode; + u8 dfs; + u32 ndf; + u32 freq; +}; + +struct dw_spi; +struct dw_spi_dma_ops { + int (*dma_init)(struct device *dev, struct dw_spi *dws); + void (*dma_exit)(struct dw_spi *dws); + int (*dma_setup)(struct dw_spi *dws, struct spi_transfer *xfer); + bool (*can_dma)(struct spi_controller *master, struct spi_device *spi, + struct spi_transfer *xfer); + int (*dma_transfer)(struct dw_spi *dws, struct spi_transfer *xfer); + void (*dma_stop)(struct dw_spi *dws); +}; + +struct dw_spi { + struct spi_controller *master; + + void __iomem *regs; + unsigned long paddr; + int irq; + u32 fifo_len; /* depth of the FIFO buffer */ + u32 max_mem_freq; /* max mem-ops bus freq */ + u32 max_freq; /* max bus freq supported */ + + u32 caps; /* DW SPI capabilities */ + + u32 reg_io_width; /* DR I/O width in bytes */ + u16 bus_num; + u16 num_cs; /* supported slave numbers */ + void (*set_cs)(struct spi_device *spi, bool enable); + + /* Current message transfer state info */ + void *tx; + unsigned int tx_len; + void *rx; + unsigned int rx_len; + u8 buf[SPI_BUF_SIZE]; + int dma_mapped; + u8 n_bytes; /* current is a 1/2 bytes op */ + irqreturn_t (*transfer_handler)(struct dw_spi *dws); + u32 current_freq; /* frequency in hz */ + u32 cur_rx_sample_dly; + u32 def_rx_sample_dly_ns; + + /* Custom memory operations */ + struct spi_controller_mem_ops mem_ops; + + /* DMA info */ + struct dma_chan *txchan; + u32 txburst; + struct dma_chan *rxchan; + u32 rxburst; + u32 dma_sg_burst; + unsigned long dma_chan_busy; + dma_addr_t dma_addr; /* phy address of the Data register */ + const struct dw_spi_dma_ops *dma_ops; + struct completion dma_completion; + +#ifdef CONFIG_DEBUG_FS + struct dentry *debugfs; + struct debugfs_regset32 regset; +#endif +}; + +static inline u32 dw_readl(struct dw_spi *dws, u32 offset) +{ + return __raw_readl(dws->regs + offset); +} + +static inline void dw_writel(struct dw_spi *dws, u32 offset, u32 val) +{ + __raw_writel(val, dws->regs + offset); +} + +static inline u32 dw_read_io_reg(struct dw_spi *dws, u32 offset) +{ + switch (dws->reg_io_width) { + case 2: + return readw_relaxed(dws->regs + offset); + case 4: + default: + return readl_relaxed(dws->regs + offset); + } +} + +static inline void dw_write_io_reg(struct dw_spi *dws, u32 offset, u32 val) +{ + switch (dws->reg_io_width) { + case 2: + writew_relaxed(val, dws->regs + offset); + break; + case 4: + default: + writel_relaxed(val, dws->regs + offset); + break; + } +} + +static inline void spi_enable_chip(struct dw_spi *dws, int enable) +{ + dw_writel(dws, DW_SPI_SSIENR, (enable ? 1 : 0)); +} + +static inline void spi_set_clk(struct dw_spi *dws, u16 div) +{ + dw_writel(dws, DW_SPI_BAUDR, div); +} + +/* Disable IRQ bits */ +static inline void spi_mask_intr(struct dw_spi *dws, u32 mask) +{ + u32 new_mask; + + new_mask = dw_readl(dws, DW_SPI_IMR) & ~mask; + dw_writel(dws, DW_SPI_IMR, new_mask); +} + +/* Enable IRQ bits */ +static inline void spi_umask_intr(struct dw_spi *dws, u32 mask) +{ + u32 new_mask; + + new_mask = dw_readl(dws, DW_SPI_IMR) | mask; + dw_writel(dws, DW_SPI_IMR, new_mask); +} + +/* + * This disables the SPI controller, interrupts, clears the interrupts status + * and CS, then re-enables the controller back. Transmit and receive FIFO + * buffers are cleared when the device is disabled. + */ +static inline void spi_reset_chip(struct dw_spi *dws) +{ + spi_enable_chip(dws, 0); + spi_mask_intr(dws, 0xff); + dw_readl(dws, DW_SPI_ICR); + dw_writel(dws, DW_SPI_SER, 0); + spi_enable_chip(dws, 1); +} + +static inline void spi_shutdown_chip(struct dw_spi *dws) +{ + spi_enable_chip(dws, 0); + spi_set_clk(dws, 0); +} + +extern void dw_spi_set_cs(struct spi_device *spi, bool enable); +extern void dw_spi_update_config(struct dw_spi *dws, struct spi_device *spi, + struct dw_spi_cfg *cfg); +extern int dw_spi_check_status(struct dw_spi *dws, bool raw); +extern int dw_spi_add_host(struct device *dev, struct dw_spi *dws); +extern void dw_spi_remove_host(struct dw_spi *dws); +extern int dw_spi_suspend_host(struct dw_spi *dws); +extern int dw_spi_resume_host(struct dw_spi *dws); + +#ifdef CONFIG_SPI_DW_DMA + +extern void dw_spi_dma_setup_mfld(struct dw_spi *dws); +extern void dw_spi_dma_setup_generic(struct dw_spi *dws); + +#else + +static inline void dw_spi_dma_setup_mfld(struct dw_spi *dws) {} +static inline void dw_spi_dma_setup_generic(struct dw_spi *dws) {} + +#endif /* !CONFIG_SPI_DW_DMA */ + +#endif /* DW_SPI_HEADER_H */ diff --git a/drivers/spi/spi-efm32.c b/drivers/spi/spi-efm32.c new file mode 100644 index 000000000..ea6e4a7b3 --- /dev/null +++ b/drivers/spi/spi-efm32.c @@ -0,0 +1,462 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright (C) 2012-2013 Uwe Kleine-Koenig for Pengutronix + */ +#include <linux/kernel.h> +#include <linux/io.h> +#include <linux/spi/spi.h> +#include <linux/spi/spi_bitbang.h> +#include <linux/interrupt.h> +#include <linux/platform_device.h> +#include <linux/clk.h> +#include <linux/err.h> +#include <linux/module.h> +#include <linux/platform_data/efm32-spi.h> +#include <linux/of.h> + +#define DRIVER_NAME "efm32-spi" + +#define MASK_VAL(mask, val) ((val << __ffs(mask)) & mask) + +#define REG_CTRL 0x00 +#define REG_CTRL_SYNC 0x0001 +#define REG_CTRL_CLKPOL 0x0100 +#define REG_CTRL_CLKPHA 0x0200 +#define REG_CTRL_MSBF 0x0400 +#define REG_CTRL_TXBIL 0x1000 + +#define REG_FRAME 0x04 +#define REG_FRAME_DATABITS__MASK 0x000f +#define REG_FRAME_DATABITS(n) ((n) - 3) + +#define REG_CMD 0x0c +#define REG_CMD_RXEN 0x0001 +#define REG_CMD_RXDIS 0x0002 +#define REG_CMD_TXEN 0x0004 +#define REG_CMD_TXDIS 0x0008 +#define REG_CMD_MASTEREN 0x0010 + +#define REG_STATUS 0x10 +#define REG_STATUS_TXENS 0x0002 +#define REG_STATUS_TXC 0x0020 +#define REG_STATUS_TXBL 0x0040 +#define REG_STATUS_RXDATAV 0x0080 + +#define REG_CLKDIV 0x14 + +#define REG_RXDATAX 0x18 +#define REG_RXDATAX_RXDATA__MASK 0x01ff +#define REG_RXDATAX_PERR 0x4000 +#define REG_RXDATAX_FERR 0x8000 + +#define REG_TXDATA 0x34 + +#define REG_IF 0x40 +#define REG_IF_TXBL 0x0002 +#define REG_IF_RXDATAV 0x0004 + +#define REG_IFS 0x44 +#define REG_IFC 0x48 +#define REG_IEN 0x4c + +#define REG_ROUTE 0x54 +#define REG_ROUTE_RXPEN 0x0001 +#define REG_ROUTE_TXPEN 0x0002 +#define REG_ROUTE_CLKPEN 0x0008 +#define REG_ROUTE_LOCATION__MASK 0x0700 +#define REG_ROUTE_LOCATION(n) MASK_VAL(REG_ROUTE_LOCATION__MASK, (n)) + +struct efm32_spi_ddata { + struct spi_bitbang bitbang; + + spinlock_t lock; + + struct clk *clk; + void __iomem *base; + unsigned int rxirq, txirq; + struct efm32_spi_pdata pdata; + + /* irq data */ + struct completion done; + const u8 *tx_buf; + u8 *rx_buf; + unsigned tx_len, rx_len; +}; + +#define ddata_to_dev(ddata) (&(ddata->bitbang.master->dev)) +#define efm32_spi_vdbg(ddata, format, arg...) \ + dev_vdbg(ddata_to_dev(ddata), format, ##arg) + +static void efm32_spi_write32(struct efm32_spi_ddata *ddata, + u32 value, unsigned offset) +{ + writel_relaxed(value, ddata->base + offset); +} + +static u32 efm32_spi_read32(struct efm32_spi_ddata *ddata, unsigned offset) +{ + return readl_relaxed(ddata->base + offset); +} + +static int efm32_spi_setup_transfer(struct spi_device *spi, + struct spi_transfer *t) +{ + struct efm32_spi_ddata *ddata = spi_master_get_devdata(spi->master); + + unsigned bpw = t->bits_per_word ?: spi->bits_per_word; + unsigned speed = t->speed_hz ?: spi->max_speed_hz; + unsigned long clkfreq = clk_get_rate(ddata->clk); + u32 clkdiv; + + efm32_spi_write32(ddata, REG_CTRL_SYNC | REG_CTRL_MSBF | + (spi->mode & SPI_CPHA ? REG_CTRL_CLKPHA : 0) | + (spi->mode & SPI_CPOL ? REG_CTRL_CLKPOL : 0), REG_CTRL); + + efm32_spi_write32(ddata, + REG_FRAME_DATABITS(bpw), REG_FRAME); + + if (2 * speed >= clkfreq) + clkdiv = 0; + else + clkdiv = 64 * (DIV_ROUND_UP(2 * clkfreq, speed) - 4); + + if (clkdiv > (1U << 21)) + return -EINVAL; + + efm32_spi_write32(ddata, clkdiv, REG_CLKDIV); + efm32_spi_write32(ddata, REG_CMD_MASTEREN, REG_CMD); + efm32_spi_write32(ddata, REG_CMD_RXEN | REG_CMD_TXEN, REG_CMD); + + return 0; +} + +static void efm32_spi_tx_u8(struct efm32_spi_ddata *ddata) +{ + u8 val = 0; + + if (ddata->tx_buf) { + val = *ddata->tx_buf; + ddata->tx_buf++; + } + + ddata->tx_len--; + efm32_spi_write32(ddata, val, REG_TXDATA); + efm32_spi_vdbg(ddata, "%s: tx 0x%x\n", __func__, val); +} + +static void efm32_spi_rx_u8(struct efm32_spi_ddata *ddata) +{ + u32 rxdata = efm32_spi_read32(ddata, REG_RXDATAX); + efm32_spi_vdbg(ddata, "%s: rx 0x%x\n", __func__, rxdata); + + if (ddata->rx_buf) { + *ddata->rx_buf = rxdata; + ddata->rx_buf++; + } + + ddata->rx_len--; +} + +static void efm32_spi_filltx(struct efm32_spi_ddata *ddata) +{ + while (ddata->tx_len && + ddata->tx_len + 2 > ddata->rx_len && + efm32_spi_read32(ddata, REG_STATUS) & REG_STATUS_TXBL) { + efm32_spi_tx_u8(ddata); + } +} + +static int efm32_spi_txrx_bufs(struct spi_device *spi, struct spi_transfer *t) +{ + struct efm32_spi_ddata *ddata = spi_master_get_devdata(spi->master); + int ret = -EBUSY; + + spin_lock_irq(&ddata->lock); + + if (ddata->tx_buf || ddata->rx_buf) + goto out_unlock; + + ddata->tx_buf = t->tx_buf; + ddata->rx_buf = t->rx_buf; + ddata->tx_len = ddata->rx_len = + t->len * DIV_ROUND_UP(t->bits_per_word, 8); + + efm32_spi_filltx(ddata); + + reinit_completion(&ddata->done); + + efm32_spi_write32(ddata, REG_IF_TXBL | REG_IF_RXDATAV, REG_IEN); + + spin_unlock_irq(&ddata->lock); + + wait_for_completion(&ddata->done); + + spin_lock_irq(&ddata->lock); + + ret = t->len - max(ddata->tx_len, ddata->rx_len); + + efm32_spi_write32(ddata, 0, REG_IEN); + ddata->tx_buf = ddata->rx_buf = NULL; + +out_unlock: + spin_unlock_irq(&ddata->lock); + + return ret; +} + +static irqreturn_t efm32_spi_rxirq(int irq, void *data) +{ + struct efm32_spi_ddata *ddata = data; + irqreturn_t ret = IRQ_NONE; + + spin_lock(&ddata->lock); + + while (ddata->rx_len > 0 && + efm32_spi_read32(ddata, REG_STATUS) & + REG_STATUS_RXDATAV) { + efm32_spi_rx_u8(ddata); + + ret = IRQ_HANDLED; + } + + if (!ddata->rx_len) { + u32 ien = efm32_spi_read32(ddata, REG_IEN); + + ien &= ~REG_IF_RXDATAV; + + efm32_spi_write32(ddata, ien, REG_IEN); + + complete(&ddata->done); + } + + spin_unlock(&ddata->lock); + + return ret; +} + +static irqreturn_t efm32_spi_txirq(int irq, void *data) +{ + struct efm32_spi_ddata *ddata = data; + + efm32_spi_vdbg(ddata, + "%s: txlen = %u, rxlen = %u, if=0x%08x, stat=0x%08x\n", + __func__, ddata->tx_len, ddata->rx_len, + efm32_spi_read32(ddata, REG_IF), + efm32_spi_read32(ddata, REG_STATUS)); + + spin_lock(&ddata->lock); + + efm32_spi_filltx(ddata); + + efm32_spi_vdbg(ddata, "%s: txlen = %u, rxlen = %u\n", + __func__, ddata->tx_len, ddata->rx_len); + + if (!ddata->tx_len) { + u32 ien = efm32_spi_read32(ddata, REG_IEN); + + ien &= ~REG_IF_TXBL; + + efm32_spi_write32(ddata, ien, REG_IEN); + efm32_spi_vdbg(ddata, "disable TXBL\n"); + } + + spin_unlock(&ddata->lock); + + return IRQ_HANDLED; +} + +static u32 efm32_spi_get_configured_location(struct efm32_spi_ddata *ddata) +{ + u32 reg = efm32_spi_read32(ddata, REG_ROUTE); + + return (reg & REG_ROUTE_LOCATION__MASK) >> __ffs(REG_ROUTE_LOCATION__MASK); +} + +static void efm32_spi_probe_dt(struct platform_device *pdev, + struct spi_master *master, struct efm32_spi_ddata *ddata) +{ + struct device_node *np = pdev->dev.of_node; + u32 location; + int ret; + + ret = of_property_read_u32(np, "energymicro,location", &location); + + if (ret) + /* fall back to wrongly namespaced property */ + ret = of_property_read_u32(np, "efm32,location", &location); + + if (ret) + /* fall back to old and (wrongly) generic property "location" */ + ret = of_property_read_u32(np, "location", &location); + + if (!ret) { + dev_dbg(&pdev->dev, "using location %u\n", location); + } else { + /* default to location configured in hardware */ + location = efm32_spi_get_configured_location(ddata); + + dev_info(&pdev->dev, "fall back to location %u\n", location); + } + + ddata->pdata.location = location; +} + +static int efm32_spi_probe(struct platform_device *pdev) +{ + struct efm32_spi_ddata *ddata; + struct resource *res; + int ret; + struct spi_master *master; + struct device_node *np = pdev->dev.of_node; + + if (!np) + return -EINVAL; + + master = spi_alloc_master(&pdev->dev, sizeof(*ddata)); + if (!master) { + dev_dbg(&pdev->dev, + "failed to allocate spi master controller\n"); + return -ENOMEM; + } + platform_set_drvdata(pdev, master); + + master->dev.of_node = pdev->dev.of_node; + + master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH; + master->bits_per_word_mask = SPI_BPW_RANGE_MASK(4, 16); + master->use_gpio_descriptors = true; + + ddata = spi_master_get_devdata(master); + + ddata->bitbang.master = master; + ddata->bitbang.setup_transfer = efm32_spi_setup_transfer; + ddata->bitbang.txrx_bufs = efm32_spi_txrx_bufs; + + spin_lock_init(&ddata->lock); + init_completion(&ddata->done); + + ddata->clk = devm_clk_get(&pdev->dev, NULL); + if (IS_ERR(ddata->clk)) { + ret = PTR_ERR(ddata->clk); + dev_err(&pdev->dev, "failed to get clock: %d\n", ret); + goto err; + } + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + if (!res) { + ret = -ENODEV; + dev_err(&pdev->dev, "failed to determine base address\n"); + goto err; + } + + if (resource_size(res) < 0x60) { + ret = -EINVAL; + dev_err(&pdev->dev, "memory resource too small\n"); + goto err; + } + + ddata->base = devm_ioremap_resource(&pdev->dev, res); + if (IS_ERR(ddata->base)) { + ret = PTR_ERR(ddata->base); + goto err; + } + + ret = platform_get_irq(pdev, 0); + if (ret <= 0) + goto err; + + ddata->rxirq = ret; + + ret = platform_get_irq(pdev, 1); + if (ret <= 0) + ret = ddata->rxirq + 1; + + ddata->txirq = ret; + + ret = clk_prepare_enable(ddata->clk); + if (ret < 0) { + dev_err(&pdev->dev, "failed to enable clock (%d)\n", ret); + goto err; + } + + efm32_spi_probe_dt(pdev, master, ddata); + + efm32_spi_write32(ddata, 0, REG_IEN); + efm32_spi_write32(ddata, REG_ROUTE_TXPEN | REG_ROUTE_RXPEN | + REG_ROUTE_CLKPEN | + REG_ROUTE_LOCATION(ddata->pdata.location), REG_ROUTE); + + ret = request_irq(ddata->rxirq, efm32_spi_rxirq, + 0, DRIVER_NAME " rx", ddata); + if (ret) { + dev_err(&pdev->dev, "failed to register rxirq (%d)\n", ret); + goto err_disable_clk; + } + + ret = request_irq(ddata->txirq, efm32_spi_txirq, + 0, DRIVER_NAME " tx", ddata); + if (ret) { + dev_err(&pdev->dev, "failed to register txirq (%d)\n", ret); + goto err_free_rx_irq; + } + + ret = spi_bitbang_start(&ddata->bitbang); + if (ret) { + dev_err(&pdev->dev, "spi_bitbang_start failed (%d)\n", ret); + + free_irq(ddata->txirq, ddata); +err_free_rx_irq: + free_irq(ddata->rxirq, ddata); +err_disable_clk: + clk_disable_unprepare(ddata->clk); +err: + spi_master_put(master); + } + + return ret; +} + +static int efm32_spi_remove(struct platform_device *pdev) +{ + struct spi_master *master = platform_get_drvdata(pdev); + struct efm32_spi_ddata *ddata = spi_master_get_devdata(master); + + spi_bitbang_stop(&ddata->bitbang); + + efm32_spi_write32(ddata, 0, REG_IEN); + + free_irq(ddata->txirq, ddata); + free_irq(ddata->rxirq, ddata); + clk_disable_unprepare(ddata->clk); + spi_master_put(master); + + return 0; +} + +static const struct of_device_id efm32_spi_dt_ids[] = { + { + .compatible = "energymicro,efm32-spi", + }, { + /* doesn't follow the "vendor,device" scheme, don't use */ + .compatible = "efm32,spi", + }, { + /* sentinel */ + } +}; +MODULE_DEVICE_TABLE(of, efm32_spi_dt_ids); + +static struct platform_driver efm32_spi_driver = { + .probe = efm32_spi_probe, + .remove = efm32_spi_remove, + + .driver = { + .name = DRIVER_NAME, + .of_match_table = efm32_spi_dt_ids, + }, +}; +module_platform_driver(efm32_spi_driver); + +MODULE_AUTHOR("Uwe Kleine-Koenig <u.kleine-koenig@pengutronix.de>"); +MODULE_DESCRIPTION("EFM32 SPI driver"); +MODULE_LICENSE("GPL v2"); +MODULE_ALIAS("platform:" DRIVER_NAME); diff --git a/drivers/spi/spi-ep93xx.c b/drivers/spi/spi-ep93xx.c new file mode 100644 index 000000000..aa676559d --- /dev/null +++ b/drivers/spi/spi-ep93xx.c @@ -0,0 +1,770 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Driver for Cirrus Logic EP93xx SPI controller. + * + * Copyright (C) 2010-2011 Mika Westerberg + * + * Explicit FIFO handling code was inspired by amba-pl022 driver. + * + * Chip select support using other than built-in GPIOs by H. Hartley Sweeten. + * + * For more information about the SPI controller see documentation on Cirrus + * Logic web site: + * https://www.cirrus.com/en/pubs/manual/EP93xx_Users_Guide_UM1.pdf + */ + +#include <linux/io.h> +#include <linux/clk.h> +#include <linux/err.h> +#include <linux/delay.h> +#include <linux/device.h> +#include <linux/dmaengine.h> +#include <linux/bitops.h> +#include <linux/interrupt.h> +#include <linux/module.h> +#include <linux/platform_device.h> +#include <linux/sched.h> +#include <linux/scatterlist.h> +#include <linux/spi/spi.h> + +#include <linux/platform_data/dma-ep93xx.h> +#include <linux/platform_data/spi-ep93xx.h> + +#define SSPCR0 0x0000 +#define SSPCR0_SPO BIT(6) +#define SSPCR0_SPH BIT(7) +#define SSPCR0_SCR_SHIFT 8 + +#define SSPCR1 0x0004 +#define SSPCR1_RIE BIT(0) +#define SSPCR1_TIE BIT(1) +#define SSPCR1_RORIE BIT(2) +#define SSPCR1_LBM BIT(3) +#define SSPCR1_SSE BIT(4) +#define SSPCR1_MS BIT(5) +#define SSPCR1_SOD BIT(6) + +#define SSPDR 0x0008 + +#define SSPSR 0x000c +#define SSPSR_TFE BIT(0) +#define SSPSR_TNF BIT(1) +#define SSPSR_RNE BIT(2) +#define SSPSR_RFF BIT(3) +#define SSPSR_BSY BIT(4) +#define SSPCPSR 0x0010 + +#define SSPIIR 0x0014 +#define SSPIIR_RIS BIT(0) +#define SSPIIR_TIS BIT(1) +#define SSPIIR_RORIS BIT(2) +#define SSPICR SSPIIR + +/* timeout in milliseconds */ +#define SPI_TIMEOUT 5 +/* maximum depth of RX/TX FIFO */ +#define SPI_FIFO_SIZE 8 + +/** + * struct ep93xx_spi - EP93xx SPI controller structure + * @clk: clock for the controller + * @mmio: pointer to ioremap()'d registers + * @sspdr_phys: physical address of the SSPDR register + * @tx: current byte in transfer to transmit + * @rx: current byte in transfer to receive + * @fifo_level: how full is FIFO (%0..%SPI_FIFO_SIZE - %1). Receiving one + * frame decreases this level and sending one frame increases it. + * @dma_rx: RX DMA channel + * @dma_tx: TX DMA channel + * @dma_rx_data: RX parameters passed to the DMA engine + * @dma_tx_data: TX parameters passed to the DMA engine + * @rx_sgt: sg table for RX transfers + * @tx_sgt: sg table for TX transfers + * @zeropage: dummy page used as RX buffer when only TX buffer is passed in by + * the client + */ +struct ep93xx_spi { + struct clk *clk; + void __iomem *mmio; + unsigned long sspdr_phys; + size_t tx; + size_t rx; + size_t fifo_level; + struct dma_chan *dma_rx; + struct dma_chan *dma_tx; + struct ep93xx_dma_data dma_rx_data; + struct ep93xx_dma_data dma_tx_data; + struct sg_table rx_sgt; + struct sg_table tx_sgt; + void *zeropage; +}; + +/* converts bits per word to CR0.DSS value */ +#define bits_per_word_to_dss(bpw) ((bpw) - 1) + +/** + * ep93xx_spi_calc_divisors() - calculates SPI clock divisors + * @master: SPI master + * @rate: desired SPI output clock rate + * @div_cpsr: pointer to return the cpsr (pre-scaler) divider + * @div_scr: pointer to return the scr divider + */ +static int ep93xx_spi_calc_divisors(struct spi_master *master, + u32 rate, u8 *div_cpsr, u8 *div_scr) +{ + struct ep93xx_spi *espi = spi_master_get_devdata(master); + unsigned long spi_clk_rate = clk_get_rate(espi->clk); + int cpsr, scr; + + /* + * Make sure that max value is between values supported by the + * controller. + */ + rate = clamp(rate, master->min_speed_hz, master->max_speed_hz); + + /* + * Calculate divisors so that we can get speed according the + * following formula: + * rate = spi_clock_rate / (cpsr * (1 + scr)) + * + * cpsr must be even number and starts from 2, scr can be any number + * between 0 and 255. + */ + for (cpsr = 2; cpsr <= 254; cpsr += 2) { + for (scr = 0; scr <= 255; scr++) { + if ((spi_clk_rate / (cpsr * (scr + 1))) <= rate) { + *div_scr = (u8)scr; + *div_cpsr = (u8)cpsr; + return 0; + } + } + } + + return -EINVAL; +} + +static int ep93xx_spi_chip_setup(struct spi_master *master, + struct spi_device *spi, + struct spi_transfer *xfer) +{ + struct ep93xx_spi *espi = spi_master_get_devdata(master); + u8 dss = bits_per_word_to_dss(xfer->bits_per_word); + u8 div_cpsr = 0; + u8 div_scr = 0; + u16 cr0; + int err; + + err = ep93xx_spi_calc_divisors(master, xfer->speed_hz, + &div_cpsr, &div_scr); + if (err) + return err; + + cr0 = div_scr << SSPCR0_SCR_SHIFT; + if (spi->mode & SPI_CPOL) + cr0 |= SSPCR0_SPO; + if (spi->mode & SPI_CPHA) + cr0 |= SSPCR0_SPH; + cr0 |= dss; + + dev_dbg(&master->dev, "setup: mode %d, cpsr %d, scr %d, dss %d\n", + spi->mode, div_cpsr, div_scr, dss); + dev_dbg(&master->dev, "setup: cr0 %#x\n", cr0); + + writel(div_cpsr, espi->mmio + SSPCPSR); + writel(cr0, espi->mmio + SSPCR0); + + return 0; +} + +static void ep93xx_do_write(struct spi_master *master) +{ + struct ep93xx_spi *espi = spi_master_get_devdata(master); + struct spi_transfer *xfer = master->cur_msg->state; + u32 val = 0; + + if (xfer->bits_per_word > 8) { + if (xfer->tx_buf) + val = ((u16 *)xfer->tx_buf)[espi->tx]; + espi->tx += 2; + } else { + if (xfer->tx_buf) + val = ((u8 *)xfer->tx_buf)[espi->tx]; + espi->tx += 1; + } + writel(val, espi->mmio + SSPDR); +} + +static void ep93xx_do_read(struct spi_master *master) +{ + struct ep93xx_spi *espi = spi_master_get_devdata(master); + struct spi_transfer *xfer = master->cur_msg->state; + u32 val; + + val = readl(espi->mmio + SSPDR); + if (xfer->bits_per_word > 8) { + if (xfer->rx_buf) + ((u16 *)xfer->rx_buf)[espi->rx] = val; + espi->rx += 2; + } else { + if (xfer->rx_buf) + ((u8 *)xfer->rx_buf)[espi->rx] = val; + espi->rx += 1; + } +} + +/** + * ep93xx_spi_read_write() - perform next RX/TX transfer + * @master: SPI master + * + * This function transfers next bytes (or half-words) to/from RX/TX FIFOs. If + * called several times, the whole transfer will be completed. Returns + * %-EINPROGRESS when current transfer was not yet completed otherwise %0. + * + * When this function is finished, RX FIFO should be empty and TX FIFO should be + * full. + */ +static int ep93xx_spi_read_write(struct spi_master *master) +{ + struct ep93xx_spi *espi = spi_master_get_devdata(master); + struct spi_transfer *xfer = master->cur_msg->state; + + /* read as long as RX FIFO has frames in it */ + while ((readl(espi->mmio + SSPSR) & SSPSR_RNE)) { + ep93xx_do_read(master); + espi->fifo_level--; + } + + /* write as long as TX FIFO has room */ + while (espi->fifo_level < SPI_FIFO_SIZE && espi->tx < xfer->len) { + ep93xx_do_write(master); + espi->fifo_level++; + } + + if (espi->rx == xfer->len) + return 0; + + return -EINPROGRESS; +} + +static enum dma_transfer_direction +ep93xx_dma_data_to_trans_dir(enum dma_data_direction dir) +{ + switch (dir) { + case DMA_TO_DEVICE: + return DMA_MEM_TO_DEV; + case DMA_FROM_DEVICE: + return DMA_DEV_TO_MEM; + default: + return DMA_TRANS_NONE; + } +} + +/** + * ep93xx_spi_dma_prepare() - prepares a DMA transfer + * @master: SPI master + * @dir: DMA transfer direction + * + * Function configures the DMA, maps the buffer and prepares the DMA + * descriptor. Returns a valid DMA descriptor in case of success and ERR_PTR + * in case of failure. + */ +static struct dma_async_tx_descriptor * +ep93xx_spi_dma_prepare(struct spi_master *master, + enum dma_data_direction dir) +{ + struct ep93xx_spi *espi = spi_master_get_devdata(master); + struct spi_transfer *xfer = master->cur_msg->state; + struct dma_async_tx_descriptor *txd; + enum dma_slave_buswidth buswidth; + struct dma_slave_config conf; + struct scatterlist *sg; + struct sg_table *sgt; + struct dma_chan *chan; + const void *buf, *pbuf; + size_t len = xfer->len; + int i, ret, nents; + + if (xfer->bits_per_word > 8) + buswidth = DMA_SLAVE_BUSWIDTH_2_BYTES; + else + buswidth = DMA_SLAVE_BUSWIDTH_1_BYTE; + + memset(&conf, 0, sizeof(conf)); + conf.direction = ep93xx_dma_data_to_trans_dir(dir); + + if (dir == DMA_FROM_DEVICE) { + chan = espi->dma_rx; + buf = xfer->rx_buf; + sgt = &espi->rx_sgt; + + conf.src_addr = espi->sspdr_phys; + conf.src_addr_width = buswidth; + } else { + chan = espi->dma_tx; + buf = xfer->tx_buf; + sgt = &espi->tx_sgt; + + conf.dst_addr = espi->sspdr_phys; + conf.dst_addr_width = buswidth; + } + + ret = dmaengine_slave_config(chan, &conf); + if (ret) + return ERR_PTR(ret); + + /* + * We need to split the transfer into PAGE_SIZE'd chunks. This is + * because we are using @espi->zeropage to provide a zero RX buffer + * for the TX transfers and we have only allocated one page for that. + * + * For performance reasons we allocate a new sg_table only when + * needed. Otherwise we will re-use the current one. Eventually the + * last sg_table is released in ep93xx_spi_release_dma(). + */ + + nents = DIV_ROUND_UP(len, PAGE_SIZE); + if (nents != sgt->nents) { + sg_free_table(sgt); + + ret = sg_alloc_table(sgt, nents, GFP_KERNEL); + if (ret) + return ERR_PTR(ret); + } + + pbuf = buf; + for_each_sg(sgt->sgl, sg, sgt->nents, i) { + size_t bytes = min_t(size_t, len, PAGE_SIZE); + + if (buf) { + sg_set_page(sg, virt_to_page(pbuf), bytes, + offset_in_page(pbuf)); + } else { + sg_set_page(sg, virt_to_page(espi->zeropage), + bytes, 0); + } + + pbuf += bytes; + len -= bytes; + } + + if (WARN_ON(len)) { + dev_warn(&master->dev, "len = %zu expected 0!\n", len); + return ERR_PTR(-EINVAL); + } + + nents = dma_map_sg(chan->device->dev, sgt->sgl, sgt->nents, dir); + if (!nents) + return ERR_PTR(-ENOMEM); + + txd = dmaengine_prep_slave_sg(chan, sgt->sgl, nents, conf.direction, + DMA_CTRL_ACK); + if (!txd) { + dma_unmap_sg(chan->device->dev, sgt->sgl, sgt->nents, dir); + return ERR_PTR(-ENOMEM); + } + return txd; +} + +/** + * ep93xx_spi_dma_finish() - finishes with a DMA transfer + * @master: SPI master + * @dir: DMA transfer direction + * + * Function finishes with the DMA transfer. After this, the DMA buffer is + * unmapped. + */ +static void ep93xx_spi_dma_finish(struct spi_master *master, + enum dma_data_direction dir) +{ + struct ep93xx_spi *espi = spi_master_get_devdata(master); + struct dma_chan *chan; + struct sg_table *sgt; + + if (dir == DMA_FROM_DEVICE) { + chan = espi->dma_rx; + sgt = &espi->rx_sgt; + } else { + chan = espi->dma_tx; + sgt = &espi->tx_sgt; + } + + dma_unmap_sg(chan->device->dev, sgt->sgl, sgt->nents, dir); +} + +static void ep93xx_spi_dma_callback(void *callback_param) +{ + struct spi_master *master = callback_param; + + ep93xx_spi_dma_finish(master, DMA_TO_DEVICE); + ep93xx_spi_dma_finish(master, DMA_FROM_DEVICE); + + spi_finalize_current_transfer(master); +} + +static int ep93xx_spi_dma_transfer(struct spi_master *master) +{ + struct ep93xx_spi *espi = spi_master_get_devdata(master); + struct dma_async_tx_descriptor *rxd, *txd; + + rxd = ep93xx_spi_dma_prepare(master, DMA_FROM_DEVICE); + if (IS_ERR(rxd)) { + dev_err(&master->dev, "DMA RX failed: %ld\n", PTR_ERR(rxd)); + return PTR_ERR(rxd); + } + + txd = ep93xx_spi_dma_prepare(master, DMA_TO_DEVICE); + if (IS_ERR(txd)) { + ep93xx_spi_dma_finish(master, DMA_FROM_DEVICE); + dev_err(&master->dev, "DMA TX failed: %ld\n", PTR_ERR(txd)); + return PTR_ERR(txd); + } + + /* We are ready when RX is done */ + rxd->callback = ep93xx_spi_dma_callback; + rxd->callback_param = master; + + /* Now submit both descriptors and start DMA */ + dmaengine_submit(rxd); + dmaengine_submit(txd); + + dma_async_issue_pending(espi->dma_rx); + dma_async_issue_pending(espi->dma_tx); + + /* signal that we need to wait for completion */ + return 1; +} + +static irqreturn_t ep93xx_spi_interrupt(int irq, void *dev_id) +{ + struct spi_master *master = dev_id; + struct ep93xx_spi *espi = spi_master_get_devdata(master); + u32 val; + + /* + * If we got ROR (receive overrun) interrupt we know that something is + * wrong. Just abort the message. + */ + if (readl(espi->mmio + SSPIIR) & SSPIIR_RORIS) { + /* clear the overrun interrupt */ + writel(0, espi->mmio + SSPICR); + dev_warn(&master->dev, + "receive overrun, aborting the message\n"); + master->cur_msg->status = -EIO; + } else { + /* + * Interrupt is either RX (RIS) or TX (TIS). For both cases we + * simply execute next data transfer. + */ + if (ep93xx_spi_read_write(master)) { + /* + * In normal case, there still is some processing left + * for current transfer. Let's wait for the next + * interrupt then. + */ + return IRQ_HANDLED; + } + } + + /* + * Current transfer is finished, either with error or with success. In + * any case we disable interrupts and notify the worker to handle + * any post-processing of the message. + */ + val = readl(espi->mmio + SSPCR1); + val &= ~(SSPCR1_RORIE | SSPCR1_TIE | SSPCR1_RIE); + writel(val, espi->mmio + SSPCR1); + + spi_finalize_current_transfer(master); + + return IRQ_HANDLED; +} + +static int ep93xx_spi_transfer_one(struct spi_master *master, + struct spi_device *spi, + struct spi_transfer *xfer) +{ + struct ep93xx_spi *espi = spi_master_get_devdata(master); + u32 val; + int ret; + + ret = ep93xx_spi_chip_setup(master, spi, xfer); + if (ret) { + dev_err(&master->dev, "failed to setup chip for transfer\n"); + return ret; + } + + master->cur_msg->state = xfer; + espi->rx = 0; + espi->tx = 0; + + /* + * There is no point of setting up DMA for the transfers which will + * fit into the FIFO and can be transferred with a single interrupt. + * So in these cases we will be using PIO and don't bother for DMA. + */ + if (espi->dma_rx && xfer->len > SPI_FIFO_SIZE) + return ep93xx_spi_dma_transfer(master); + + /* Using PIO so prime the TX FIFO and enable interrupts */ + ep93xx_spi_read_write(master); + + val = readl(espi->mmio + SSPCR1); + val |= (SSPCR1_RORIE | SSPCR1_TIE | SSPCR1_RIE); + writel(val, espi->mmio + SSPCR1); + + /* signal that we need to wait for completion */ + return 1; +} + +static int ep93xx_spi_prepare_message(struct spi_master *master, + struct spi_message *msg) +{ + struct ep93xx_spi *espi = spi_master_get_devdata(master); + unsigned long timeout; + + /* + * Just to be sure: flush any data from RX FIFO. + */ + timeout = jiffies + msecs_to_jiffies(SPI_TIMEOUT); + while (readl(espi->mmio + SSPSR) & SSPSR_RNE) { + if (time_after(jiffies, timeout)) { + dev_warn(&master->dev, + "timeout while flushing RX FIFO\n"); + return -ETIMEDOUT; + } + readl(espi->mmio + SSPDR); + } + + /* + * We explicitly handle FIFO level. This way we don't have to check TX + * FIFO status using %SSPSR_TNF bit which may cause RX FIFO overruns. + */ + espi->fifo_level = 0; + + return 0; +} + +static int ep93xx_spi_prepare_hardware(struct spi_master *master) +{ + struct ep93xx_spi *espi = spi_master_get_devdata(master); + u32 val; + int ret; + + ret = clk_enable(espi->clk); + if (ret) + return ret; + + val = readl(espi->mmio + SSPCR1); + val |= SSPCR1_SSE; + writel(val, espi->mmio + SSPCR1); + + return 0; +} + +static int ep93xx_spi_unprepare_hardware(struct spi_master *master) +{ + struct ep93xx_spi *espi = spi_master_get_devdata(master); + u32 val; + + val = readl(espi->mmio + SSPCR1); + val &= ~SSPCR1_SSE; + writel(val, espi->mmio + SSPCR1); + + clk_disable(espi->clk); + + return 0; +} + +static bool ep93xx_spi_dma_filter(struct dma_chan *chan, void *filter_param) +{ + if (ep93xx_dma_chan_is_m2p(chan)) + return false; + + chan->private = filter_param; + return true; +} + +static int ep93xx_spi_setup_dma(struct ep93xx_spi *espi) +{ + dma_cap_mask_t mask; + int ret; + + espi->zeropage = (void *)get_zeroed_page(GFP_KERNEL); + if (!espi->zeropage) + return -ENOMEM; + + dma_cap_zero(mask); + dma_cap_set(DMA_SLAVE, mask); + + espi->dma_rx_data.port = EP93XX_DMA_SSP; + espi->dma_rx_data.direction = DMA_DEV_TO_MEM; + espi->dma_rx_data.name = "ep93xx-spi-rx"; + + espi->dma_rx = dma_request_channel(mask, ep93xx_spi_dma_filter, + &espi->dma_rx_data); + if (!espi->dma_rx) { + ret = -ENODEV; + goto fail_free_page; + } + + espi->dma_tx_data.port = EP93XX_DMA_SSP; + espi->dma_tx_data.direction = DMA_MEM_TO_DEV; + espi->dma_tx_data.name = "ep93xx-spi-tx"; + + espi->dma_tx = dma_request_channel(mask, ep93xx_spi_dma_filter, + &espi->dma_tx_data); + if (!espi->dma_tx) { + ret = -ENODEV; + goto fail_release_rx; + } + + return 0; + +fail_release_rx: + dma_release_channel(espi->dma_rx); + espi->dma_rx = NULL; +fail_free_page: + free_page((unsigned long)espi->zeropage); + + return ret; +} + +static void ep93xx_spi_release_dma(struct ep93xx_spi *espi) +{ + if (espi->dma_rx) { + dma_release_channel(espi->dma_rx); + sg_free_table(&espi->rx_sgt); + } + if (espi->dma_tx) { + dma_release_channel(espi->dma_tx); + sg_free_table(&espi->tx_sgt); + } + + if (espi->zeropage) + free_page((unsigned long)espi->zeropage); +} + +static int ep93xx_spi_probe(struct platform_device *pdev) +{ + struct spi_master *master; + struct ep93xx_spi_info *info; + struct ep93xx_spi *espi; + struct resource *res; + int irq; + int error; + + info = dev_get_platdata(&pdev->dev); + if (!info) { + dev_err(&pdev->dev, "missing platform data\n"); + return -EINVAL; + } + + irq = platform_get_irq(pdev, 0); + if (irq < 0) + return -EBUSY; + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + if (!res) { + dev_err(&pdev->dev, "unable to get iomem resource\n"); + return -ENODEV; + } + + master = spi_alloc_master(&pdev->dev, sizeof(*espi)); + if (!master) + return -ENOMEM; + + master->use_gpio_descriptors = true; + master->prepare_transfer_hardware = ep93xx_spi_prepare_hardware; + master->unprepare_transfer_hardware = ep93xx_spi_unprepare_hardware; + master->prepare_message = ep93xx_spi_prepare_message; + master->transfer_one = ep93xx_spi_transfer_one; + master->bus_num = pdev->id; + master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH; + master->bits_per_word_mask = SPI_BPW_RANGE_MASK(4, 16); + /* + * The SPI core will count the number of GPIO descriptors to figure + * out the number of chip selects available on the platform. + */ + master->num_chipselect = 0; + + platform_set_drvdata(pdev, master); + + espi = spi_master_get_devdata(master); + + espi->clk = devm_clk_get(&pdev->dev, NULL); + if (IS_ERR(espi->clk)) { + dev_err(&pdev->dev, "unable to get spi clock\n"); + error = PTR_ERR(espi->clk); + goto fail_release_master; + } + + /* + * Calculate maximum and minimum supported clock rates + * for the controller. + */ + master->max_speed_hz = clk_get_rate(espi->clk) / 2; + master->min_speed_hz = clk_get_rate(espi->clk) / (254 * 256); + + espi->sspdr_phys = res->start + SSPDR; + + espi->mmio = devm_ioremap_resource(&pdev->dev, res); + if (IS_ERR(espi->mmio)) { + error = PTR_ERR(espi->mmio); + goto fail_release_master; + } + + error = devm_request_irq(&pdev->dev, irq, ep93xx_spi_interrupt, + 0, "ep93xx-spi", master); + if (error) { + dev_err(&pdev->dev, "failed to request irq\n"); + goto fail_release_master; + } + + if (info->use_dma && ep93xx_spi_setup_dma(espi)) + dev_warn(&pdev->dev, "DMA setup failed. Falling back to PIO\n"); + + /* make sure that the hardware is disabled */ + writel(0, espi->mmio + SSPCR1); + + error = devm_spi_register_master(&pdev->dev, master); + if (error) { + dev_err(&pdev->dev, "failed to register SPI master\n"); + goto fail_free_dma; + } + + dev_info(&pdev->dev, "EP93xx SPI Controller at 0x%08lx irq %d\n", + (unsigned long)res->start, irq); + + return 0; + +fail_free_dma: + ep93xx_spi_release_dma(espi); +fail_release_master: + spi_master_put(master); + + return error; +} + +static int ep93xx_spi_remove(struct platform_device *pdev) +{ + struct spi_master *master = platform_get_drvdata(pdev); + struct ep93xx_spi *espi = spi_master_get_devdata(master); + + ep93xx_spi_release_dma(espi); + + return 0; +} + +static struct platform_driver ep93xx_spi_driver = { + .driver = { + .name = "ep93xx-spi", + }, + .probe = ep93xx_spi_probe, + .remove = ep93xx_spi_remove, +}; +module_platform_driver(ep93xx_spi_driver); + +MODULE_DESCRIPTION("EP93xx SPI Controller driver"); +MODULE_AUTHOR("Mika Westerberg <mika.westerberg@iki.fi>"); +MODULE_LICENSE("GPL"); +MODULE_ALIAS("platform:ep93xx-spi"); diff --git a/drivers/spi/spi-falcon.c b/drivers/spi/spi-falcon.c new file mode 100644 index 000000000..d3336a63f --- /dev/null +++ b/drivers/spi/spi-falcon.c @@ -0,0 +1,432 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * + * Copyright (C) 2012 Thomas Langer <thomas.langer@lantiq.com> + */ + +#include <linux/module.h> +#include <linux/device.h> +#include <linux/platform_device.h> +#include <linux/spi/spi.h> +#include <linux/delay.h> +#include <linux/of.h> +#include <linux/of_platform.h> + +#include <lantiq_soc.h> + +#define DRV_NAME "sflash-falcon" + +#define FALCON_SPI_XFER_BEGIN (1 << 0) +#define FALCON_SPI_XFER_END (1 << 1) + +/* Bus Read Configuration Register0 */ +#define BUSRCON0 0x00000010 +/* Bus Write Configuration Register0 */ +#define BUSWCON0 0x00000018 +/* Serial Flash Configuration Register */ +#define SFCON 0x00000080 +/* Serial Flash Time Register */ +#define SFTIME 0x00000084 +/* Serial Flash Status Register */ +#define SFSTAT 0x00000088 +/* Serial Flash Command Register */ +#define SFCMD 0x0000008C +/* Serial Flash Address Register */ +#define SFADDR 0x00000090 +/* Serial Flash Data Register */ +#define SFDATA 0x00000094 +/* Serial Flash I/O Control Register */ +#define SFIO 0x00000098 +/* EBU Clock Control Register */ +#define EBUCC 0x000000C4 + +/* Dummy Phase Length */ +#define SFCMD_DUMLEN_OFFSET 16 +#define SFCMD_DUMLEN_MASK 0x000F0000 +/* Chip Select */ +#define SFCMD_CS_OFFSET 24 +#define SFCMD_CS_MASK 0x07000000 +/* field offset */ +#define SFCMD_ALEN_OFFSET 20 +#define SFCMD_ALEN_MASK 0x00700000 +/* SCK Rise-edge Position */ +#define SFTIME_SCKR_POS_OFFSET 8 +#define SFTIME_SCKR_POS_MASK 0x00000F00 +/* SCK Period */ +#define SFTIME_SCK_PER_OFFSET 0 +#define SFTIME_SCK_PER_MASK 0x0000000F +/* SCK Fall-edge Position */ +#define SFTIME_SCKF_POS_OFFSET 12 +#define SFTIME_SCKF_POS_MASK 0x0000F000 +/* Device Size */ +#define SFCON_DEV_SIZE_A23_0 0x03000000 +#define SFCON_DEV_SIZE_MASK 0x0F000000 +/* Read Data Position */ +#define SFTIME_RD_POS_MASK 0x000F0000 +/* Data Output */ +#define SFIO_UNUSED_WD_MASK 0x0000000F +/* Command Opcode mask */ +#define SFCMD_OPC_MASK 0x000000FF +/* dlen bytes of data to write */ +#define SFCMD_DIR_WRITE 0x00000100 +/* Data Length offset */ +#define SFCMD_DLEN_OFFSET 9 +/* Command Error */ +#define SFSTAT_CMD_ERR 0x20000000 +/* Access Command Pending */ +#define SFSTAT_CMD_PEND 0x00400000 +/* Frequency set to 100MHz. */ +#define EBUCC_EBUDIV_SELF100 0x00000001 +/* Serial Flash */ +#define BUSRCON0_AGEN_SERIAL_FLASH 0xF0000000 +/* 8-bit multiplexed */ +#define BUSRCON0_PORTW_8_BIT_MUX 0x00000000 +/* Serial Flash */ +#define BUSWCON0_AGEN_SERIAL_FLASH 0xF0000000 +/* Chip Select after opcode */ +#define SFCMD_KEEP_CS_KEEP_SELECTED 0x00008000 + +#define CLOCK_100M 100000000 +#define CLOCK_50M 50000000 + +struct falcon_sflash { + u32 sfcmd; /* for caching of opcode, direction, ... */ + struct spi_master *master; +}; + +int falcon_sflash_xfer(struct spi_device *spi, struct spi_transfer *t, + unsigned long flags) +{ + struct device *dev = &spi->dev; + struct falcon_sflash *priv = spi_master_get_devdata(spi->master); + const u8 *txp = t->tx_buf; + u8 *rxp = t->rx_buf; + unsigned int bytelen = ((8 * t->len + 7) / 8); + unsigned int len, alen, dumlen; + u32 val; + enum { + state_init, + state_command_prepare, + state_write, + state_read, + state_disable_cs, + state_end + } state = state_init; + + do { + switch (state) { + case state_init: /* detect phase of upper layer sequence */ + { + /* initial write ? */ + if (flags & FALCON_SPI_XFER_BEGIN) { + if (!txp) { + dev_err(dev, + "BEGIN without tx data!\n"); + return -ENODATA; + } + /* + * Prepare the parts of the sfcmd register, + * which should not change during a sequence! + * Only exception are the length fields, + * especially alen and dumlen. + */ + + priv->sfcmd = ((spi->chip_select + << SFCMD_CS_OFFSET) + & SFCMD_CS_MASK); + priv->sfcmd |= SFCMD_KEEP_CS_KEEP_SELECTED; + priv->sfcmd |= *txp; + txp++; + bytelen--; + if (bytelen) { + /* + * more data: + * maybe address and/or dummy + */ + state = state_command_prepare; + break; + } else { + dev_dbg(dev, "write cmd %02X\n", + priv->sfcmd & SFCMD_OPC_MASK); + } + } + /* continued write ? */ + if (txp && bytelen) { + state = state_write; + break; + } + /* read data? */ + if (rxp && bytelen) { + state = state_read; + break; + } + /* end of sequence? */ + if (flags & FALCON_SPI_XFER_END) + state = state_disable_cs; + else + state = state_end; + break; + } + /* collect tx data for address and dummy phase */ + case state_command_prepare: + { + /* txp is valid, already checked */ + val = 0; + alen = 0; + dumlen = 0; + while (bytelen > 0) { + if (alen < 3) { + val = (val << 8) | (*txp++); + alen++; + } else if ((dumlen < 15) && (*txp == 0)) { + /* + * assume dummy bytes are set to 0 + * from upper layer + */ + dumlen++; + txp++; + } else { + break; + } + bytelen--; + } + priv->sfcmd &= ~(SFCMD_ALEN_MASK | SFCMD_DUMLEN_MASK); + priv->sfcmd |= (alen << SFCMD_ALEN_OFFSET) | + (dumlen << SFCMD_DUMLEN_OFFSET); + if (alen > 0) + ltq_ebu_w32(val, SFADDR); + + dev_dbg(dev, "wr %02X, alen=%d (addr=%06X) dlen=%d\n", + priv->sfcmd & SFCMD_OPC_MASK, + alen, val, dumlen); + + if (bytelen > 0) { + /* continue with write */ + state = state_write; + } else if (flags & FALCON_SPI_XFER_END) { + /* end of sequence? */ + state = state_disable_cs; + } else { + /* + * go to end and expect another + * call (read or write) + */ + state = state_end; + } + break; + } + case state_write: + { + /* txp still valid */ + priv->sfcmd |= SFCMD_DIR_WRITE; + len = 0; + val = 0; + do { + if (bytelen--) + val |= (*txp++) << (8 * len++); + if ((flags & FALCON_SPI_XFER_END) + && (bytelen == 0)) { + priv->sfcmd &= + ~SFCMD_KEEP_CS_KEEP_SELECTED; + } + if ((len == 4) || (bytelen == 0)) { + ltq_ebu_w32(val, SFDATA); + ltq_ebu_w32(priv->sfcmd + | (len<<SFCMD_DLEN_OFFSET), + SFCMD); + len = 0; + val = 0; + priv->sfcmd &= ~(SFCMD_ALEN_MASK + | SFCMD_DUMLEN_MASK); + } + } while (bytelen); + state = state_end; + break; + } + case state_read: + { + /* read data */ + priv->sfcmd &= ~SFCMD_DIR_WRITE; + do { + if ((flags & FALCON_SPI_XFER_END) + && (bytelen <= 4)) { + priv->sfcmd &= + ~SFCMD_KEEP_CS_KEEP_SELECTED; + } + len = (bytelen > 4) ? 4 : bytelen; + bytelen -= len; + ltq_ebu_w32(priv->sfcmd + | (len << SFCMD_DLEN_OFFSET), SFCMD); + priv->sfcmd &= ~(SFCMD_ALEN_MASK + | SFCMD_DUMLEN_MASK); + do { + val = ltq_ebu_r32(SFSTAT); + if (val & SFSTAT_CMD_ERR) { + /* reset error status */ + dev_err(dev, "SFSTAT: CMD_ERR"); + dev_err(dev, " (%x)\n", val); + ltq_ebu_w32(SFSTAT_CMD_ERR, + SFSTAT); + return -EBADE; + } + } while (val & SFSTAT_CMD_PEND); + val = ltq_ebu_r32(SFDATA); + do { + *rxp = (val & 0xFF); + rxp++; + val >>= 8; + len--; + } while (len); + } while (bytelen); + state = state_end; + break; + } + case state_disable_cs: + { + priv->sfcmd &= ~SFCMD_KEEP_CS_KEEP_SELECTED; + ltq_ebu_w32(priv->sfcmd | (0 << SFCMD_DLEN_OFFSET), + SFCMD); + val = ltq_ebu_r32(SFSTAT); + if (val & SFSTAT_CMD_ERR) { + /* reset error status */ + dev_err(dev, "SFSTAT: CMD_ERR (%x)\n", val); + ltq_ebu_w32(SFSTAT_CMD_ERR, SFSTAT); + return -EBADE; + } + state = state_end; + break; + } + case state_end: + break; + } + } while (state != state_end); + + return 0; +} + +static int falcon_sflash_setup(struct spi_device *spi) +{ + unsigned int i; + unsigned long flags; + + spin_lock_irqsave(&ebu_lock, flags); + + if (spi->max_speed_hz >= CLOCK_100M) { + /* set EBU clock to 100 MHz */ + ltq_sys1_w32_mask(0, EBUCC_EBUDIV_SELF100, EBUCC); + i = 1; /* divider */ + } else { + /* set EBU clock to 50 MHz */ + ltq_sys1_w32_mask(EBUCC_EBUDIV_SELF100, 0, EBUCC); + + /* search for suitable divider */ + for (i = 1; i < 7; i++) { + if (CLOCK_50M / i <= spi->max_speed_hz) + break; + } + } + + /* setup period of serial clock */ + ltq_ebu_w32_mask(SFTIME_SCKF_POS_MASK + | SFTIME_SCKR_POS_MASK + | SFTIME_SCK_PER_MASK, + (i << SFTIME_SCKR_POS_OFFSET) + | (i << (SFTIME_SCK_PER_OFFSET + 1)), + SFTIME); + + /* + * set some bits of unused_wd, to not trigger HOLD/WP + * signals on non QUAD flashes + */ + ltq_ebu_w32((SFIO_UNUSED_WD_MASK & (0x8 | 0x4)), SFIO); + + ltq_ebu_w32(BUSRCON0_AGEN_SERIAL_FLASH | BUSRCON0_PORTW_8_BIT_MUX, + BUSRCON0); + ltq_ebu_w32(BUSWCON0_AGEN_SERIAL_FLASH, BUSWCON0); + /* set address wrap around to maximum for 24-bit addresses */ + ltq_ebu_w32_mask(SFCON_DEV_SIZE_MASK, SFCON_DEV_SIZE_A23_0, SFCON); + + spin_unlock_irqrestore(&ebu_lock, flags); + + return 0; +} + +static int falcon_sflash_xfer_one(struct spi_master *master, + struct spi_message *m) +{ + struct falcon_sflash *priv = spi_master_get_devdata(master); + struct spi_transfer *t; + unsigned long spi_flags; + unsigned long flags; + int ret = 0; + + priv->sfcmd = 0; + m->actual_length = 0; + + spi_flags = FALCON_SPI_XFER_BEGIN; + list_for_each_entry(t, &m->transfers, transfer_list) { + if (list_is_last(&t->transfer_list, &m->transfers)) + spi_flags |= FALCON_SPI_XFER_END; + + spin_lock_irqsave(&ebu_lock, flags); + ret = falcon_sflash_xfer(m->spi, t, spi_flags); + spin_unlock_irqrestore(&ebu_lock, flags); + + if (ret) + break; + + m->actual_length += t->len; + + WARN_ON(t->delay_usecs || t->delay.value || t->cs_change); + spi_flags = 0; + } + + m->status = ret; + spi_finalize_current_message(master); + + return 0; +} + +static int falcon_sflash_probe(struct platform_device *pdev) +{ + struct falcon_sflash *priv; + struct spi_master *master; + int ret; + + master = spi_alloc_master(&pdev->dev, sizeof(*priv)); + if (!master) + return -ENOMEM; + + priv = spi_master_get_devdata(master); + priv->master = master; + + master->mode_bits = SPI_MODE_3; + master->flags = SPI_MASTER_HALF_DUPLEX; + master->setup = falcon_sflash_setup; + master->transfer_one_message = falcon_sflash_xfer_one; + master->dev.of_node = pdev->dev.of_node; + + ret = devm_spi_register_master(&pdev->dev, master); + if (ret) + spi_master_put(master); + return ret; +} + +static const struct of_device_id falcon_sflash_match[] = { + { .compatible = "lantiq,sflash-falcon" }, + {}, +}; +MODULE_DEVICE_TABLE(of, falcon_sflash_match); + +static struct platform_driver falcon_sflash_driver = { + .probe = falcon_sflash_probe, + .driver = { + .name = DRV_NAME, + .of_match_table = falcon_sflash_match, + } +}; + +module_platform_driver(falcon_sflash_driver); + +MODULE_LICENSE("GPL"); +MODULE_DESCRIPTION("Lantiq Falcon SPI/SFLASH controller driver"); diff --git a/drivers/spi/spi-fsi.c b/drivers/spi/spi-fsi.c new file mode 100644 index 000000000..3920cd328 --- /dev/null +++ b/drivers/spi/spi-fsi.c @@ -0,0 +1,635 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +// Copyright (C) IBM Corporation 2020 + +#include <linux/bitfield.h> +#include <linux/bits.h> +#include <linux/fsi.h> +#include <linux/jiffies.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/of.h> +#include <linux/spi/spi.h> + +#define FSI_ENGID_SPI 0x23 +#define FSI_MBOX_ROOT_CTRL_8 0x2860 +#define FSI_MBOX_ROOT_CTRL_8_SPI_MUX 0xf0000000 + +#define FSI2SPI_DATA0 0x00 +#define FSI2SPI_DATA1 0x04 +#define FSI2SPI_CMD 0x08 +#define FSI2SPI_CMD_WRITE BIT(31) +#define FSI2SPI_RESET 0x18 +#define FSI2SPI_STATUS 0x1c +#define FSI2SPI_STATUS_ANY_ERROR BIT(31) +#define FSI2SPI_IRQ 0x20 + +#define SPI_FSI_BASE 0x70000 +#define SPI_FSI_INIT_TIMEOUT_MS 1000 +#define SPI_FSI_MAX_XFR_SIZE 2048 +#define SPI_FSI_MAX_XFR_SIZE_RESTRICTED 32 + +#define SPI_FSI_ERROR 0x0 +#define SPI_FSI_COUNTER_CFG 0x1 +#define SPI_FSI_COUNTER_CFG_LOOPS(x) (((u64)(x) & 0xffULL) << 32) +#define SPI_FSI_COUNTER_CFG_N2_RX BIT_ULL(8) +#define SPI_FSI_COUNTER_CFG_N2_TX BIT_ULL(9) +#define SPI_FSI_COUNTER_CFG_N2_IMPLICIT BIT_ULL(10) +#define SPI_FSI_COUNTER_CFG_N2_RELOAD BIT_ULL(11) +#define SPI_FSI_CFG1 0x2 +#define SPI_FSI_CLOCK_CFG 0x3 +#define SPI_FSI_CLOCK_CFG_MM_ENABLE BIT_ULL(32) +#define SPI_FSI_CLOCK_CFG_ECC_DISABLE (BIT_ULL(35) | BIT_ULL(33)) +#define SPI_FSI_CLOCK_CFG_RESET1 (BIT_ULL(36) | BIT_ULL(38)) +#define SPI_FSI_CLOCK_CFG_RESET2 (BIT_ULL(37) | BIT_ULL(39)) +#define SPI_FSI_CLOCK_CFG_MODE (BIT_ULL(41) | BIT_ULL(42)) +#define SPI_FSI_CLOCK_CFG_SCK_RECV_DEL GENMASK_ULL(51, 44) +#define SPI_FSI_CLOCK_CFG_SCK_NO_DEL BIT_ULL(51) +#define SPI_FSI_CLOCK_CFG_SCK_DIV GENMASK_ULL(63, 52) +#define SPI_FSI_MMAP 0x4 +#define SPI_FSI_DATA_TX 0x5 +#define SPI_FSI_DATA_RX 0x6 +#define SPI_FSI_SEQUENCE 0x7 +#define SPI_FSI_SEQUENCE_STOP 0x00 +#define SPI_FSI_SEQUENCE_SEL_SLAVE(x) (0x10 | ((x) & 0xf)) +#define SPI_FSI_SEQUENCE_SHIFT_OUT(x) (0x30 | ((x) & 0xf)) +#define SPI_FSI_SEQUENCE_SHIFT_IN(x) (0x40 | ((x) & 0xf)) +#define SPI_FSI_SEQUENCE_COPY_DATA_TX 0xc0 +#define SPI_FSI_SEQUENCE_BRANCH(x) (0xe0 | ((x) & 0xf)) +#define SPI_FSI_STATUS 0x8 +#define SPI_FSI_STATUS_ERROR \ + (GENMASK_ULL(31, 21) | GENMASK_ULL(15, 12)) +#define SPI_FSI_STATUS_SEQ_STATE GENMASK_ULL(55, 48) +#define SPI_FSI_STATUS_SEQ_STATE_IDLE BIT_ULL(48) +#define SPI_FSI_STATUS_TDR_UNDERRUN BIT_ULL(57) +#define SPI_FSI_STATUS_TDR_OVERRUN BIT_ULL(58) +#define SPI_FSI_STATUS_TDR_FULL BIT_ULL(59) +#define SPI_FSI_STATUS_RDR_UNDERRUN BIT_ULL(61) +#define SPI_FSI_STATUS_RDR_OVERRUN BIT_ULL(62) +#define SPI_FSI_STATUS_RDR_FULL BIT_ULL(63) +#define SPI_FSI_STATUS_ANY_ERROR \ + (SPI_FSI_STATUS_ERROR | \ + SPI_FSI_STATUS_TDR_OVERRUN | SPI_FSI_STATUS_RDR_UNDERRUN | \ + SPI_FSI_STATUS_RDR_OVERRUN) +#define SPI_FSI_PORT_CTRL 0x9 + +struct fsi_spi { + struct device *dev; /* SPI controller device */ + struct fsi_device *fsi; /* FSI2SPI CFAM engine device */ + u32 base; + size_t max_xfr_size; + bool restricted; +}; + +struct fsi_spi_sequence { + int bit; + u64 data; +}; + +static int fsi_spi_check_mux(struct fsi_device *fsi, struct device *dev) +{ + int rc; + u32 root_ctrl_8; + __be32 root_ctrl_8_be; + + rc = fsi_slave_read(fsi->slave, FSI_MBOX_ROOT_CTRL_8, &root_ctrl_8_be, + sizeof(root_ctrl_8_be)); + if (rc) + return rc; + + root_ctrl_8 = be32_to_cpu(root_ctrl_8_be); + dev_dbg(dev, "Root control register 8: %08x\n", root_ctrl_8); + if ((root_ctrl_8 & FSI_MBOX_ROOT_CTRL_8_SPI_MUX) == + FSI_MBOX_ROOT_CTRL_8_SPI_MUX) + return 0; + + return -ENOLINK; +} + +static int fsi_spi_check_status(struct fsi_spi *ctx) +{ + int rc; + u32 sts; + __be32 sts_be; + + rc = fsi_device_read(ctx->fsi, FSI2SPI_STATUS, &sts_be, + sizeof(sts_be)); + if (rc) + return rc; + + sts = be32_to_cpu(sts_be); + if (sts & FSI2SPI_STATUS_ANY_ERROR) { + dev_err(ctx->dev, "Error with FSI2SPI interface: %08x.\n", sts); + return -EIO; + } + + return 0; +} + +static int fsi_spi_read_reg(struct fsi_spi *ctx, u32 offset, u64 *value) +{ + int rc; + __be32 cmd_be; + __be32 data_be; + u32 cmd = offset + ctx->base; + + *value = 0ULL; + + if (cmd & FSI2SPI_CMD_WRITE) + return -EINVAL; + + cmd_be = cpu_to_be32(cmd); + rc = fsi_device_write(ctx->fsi, FSI2SPI_CMD, &cmd_be, sizeof(cmd_be)); + if (rc) + return rc; + + rc = fsi_spi_check_status(ctx); + if (rc) + return rc; + + rc = fsi_device_read(ctx->fsi, FSI2SPI_DATA0, &data_be, + sizeof(data_be)); + if (rc) + return rc; + + *value |= (u64)be32_to_cpu(data_be) << 32; + + rc = fsi_device_read(ctx->fsi, FSI2SPI_DATA1, &data_be, + sizeof(data_be)); + if (rc) + return rc; + + *value |= (u64)be32_to_cpu(data_be); + dev_dbg(ctx->dev, "Read %02x[%016llx].\n", offset, *value); + + return 0; +} + +static int fsi_spi_write_reg(struct fsi_spi *ctx, u32 offset, u64 value) +{ + int rc; + __be32 cmd_be; + __be32 data_be; + u32 cmd = offset + ctx->base; + + if (cmd & FSI2SPI_CMD_WRITE) + return -EINVAL; + + dev_dbg(ctx->dev, "Write %02x[%016llx].\n", offset, value); + + data_be = cpu_to_be32(upper_32_bits(value)); + rc = fsi_device_write(ctx->fsi, FSI2SPI_DATA0, &data_be, + sizeof(data_be)); + if (rc) + return rc; + + data_be = cpu_to_be32(lower_32_bits(value)); + rc = fsi_device_write(ctx->fsi, FSI2SPI_DATA1, &data_be, + sizeof(data_be)); + if (rc) + return rc; + + cmd_be = cpu_to_be32(cmd | FSI2SPI_CMD_WRITE); + rc = fsi_device_write(ctx->fsi, FSI2SPI_CMD, &cmd_be, sizeof(cmd_be)); + if (rc) + return rc; + + return fsi_spi_check_status(ctx); +} + +static int fsi_spi_data_in(u64 in, u8 *rx, int len) +{ + int i; + int num_bytes = min(len, 8); + + for (i = 0; i < num_bytes; ++i) + rx[i] = (u8)(in >> (8 * ((num_bytes - 1) - i))); + + return num_bytes; +} + +static int fsi_spi_data_out(u64 *out, const u8 *tx, int len) +{ + int i; + int num_bytes = min(len, 8); + u8 *out_bytes = (u8 *)out; + + /* Unused bytes of the tx data should be 0. */ + *out = 0ULL; + + for (i = 0; i < num_bytes; ++i) + out_bytes[8 - (i + 1)] = tx[i]; + + return num_bytes; +} + +static int fsi_spi_reset(struct fsi_spi *ctx) +{ + int rc; + + dev_dbg(ctx->dev, "Resetting SPI controller.\n"); + + rc = fsi_spi_write_reg(ctx, SPI_FSI_CLOCK_CFG, + SPI_FSI_CLOCK_CFG_RESET1); + if (rc) + return rc; + + rc = fsi_spi_write_reg(ctx, SPI_FSI_CLOCK_CFG, + SPI_FSI_CLOCK_CFG_RESET2); + if (rc) + return rc; + + return fsi_spi_write_reg(ctx, SPI_FSI_STATUS, 0ULL); +} + +static int fsi_spi_sequence_add(struct fsi_spi_sequence *seq, u8 val) +{ + /* + * Add the next byte of instruction to the 8-byte sequence register. + * Then decrement the counter so that the next instruction will go in + * the right place. Return the index of the slot we just filled in the + * sequence register. + */ + seq->data |= (u64)val << seq->bit; + seq->bit -= 8; + + return ((64 - seq->bit) / 8) - 2; +} + +static void fsi_spi_sequence_init(struct fsi_spi_sequence *seq) +{ + seq->bit = 56; + seq->data = 0ULL; +} + +static int fsi_spi_sequence_transfer(struct fsi_spi *ctx, + struct fsi_spi_sequence *seq, + struct spi_transfer *transfer) +{ + bool docfg = false; + int loops; + int idx; + int rc; + u8 val = 0; + u8 len = min(transfer->len, 8U); + u8 rem = transfer->len % len; + u64 cfg = 0ULL; + + loops = transfer->len / len; + + if (transfer->tx_buf) { + val = SPI_FSI_SEQUENCE_SHIFT_OUT(len); + idx = fsi_spi_sequence_add(seq, val); + + if (rem) + rem = SPI_FSI_SEQUENCE_SHIFT_OUT(rem); + } else if (transfer->rx_buf) { + val = SPI_FSI_SEQUENCE_SHIFT_IN(len); + idx = fsi_spi_sequence_add(seq, val); + + if (rem) + rem = SPI_FSI_SEQUENCE_SHIFT_IN(rem); + } else { + return -EINVAL; + } + + if (ctx->restricted) { + const int eidx = rem ? 5 : 6; + + while (loops > 1 && idx <= eidx) { + idx = fsi_spi_sequence_add(seq, val); + loops--; + docfg = true; + } + + if (loops > 1) { + dev_warn(ctx->dev, "No sequencer slots; aborting.\n"); + return -EINVAL; + } + } + + if (loops > 1) { + fsi_spi_sequence_add(seq, SPI_FSI_SEQUENCE_BRANCH(idx)); + docfg = true; + } + + if (docfg) { + cfg = SPI_FSI_COUNTER_CFG_LOOPS(loops - 1); + if (transfer->rx_buf) + cfg |= SPI_FSI_COUNTER_CFG_N2_RX | + SPI_FSI_COUNTER_CFG_N2_TX | + SPI_FSI_COUNTER_CFG_N2_IMPLICIT | + SPI_FSI_COUNTER_CFG_N2_RELOAD; + + rc = fsi_spi_write_reg(ctx, SPI_FSI_COUNTER_CFG, cfg); + if (rc) + return rc; + } else { + fsi_spi_write_reg(ctx, SPI_FSI_COUNTER_CFG, 0ULL); + } + + if (rem) + fsi_spi_sequence_add(seq, rem); + + return 0; +} + +static int fsi_spi_transfer_data(struct fsi_spi *ctx, + struct spi_transfer *transfer) +{ + int rc = 0; + u64 status = 0ULL; + u64 cfg = 0ULL; + + if (transfer->tx_buf) { + int nb; + int sent = 0; + u64 out = 0ULL; + const u8 *tx = transfer->tx_buf; + + while (transfer->len > sent) { + nb = fsi_spi_data_out(&out, &tx[sent], + (int)transfer->len - sent); + + rc = fsi_spi_write_reg(ctx, SPI_FSI_DATA_TX, out); + if (rc) + return rc; + + do { + rc = fsi_spi_read_reg(ctx, SPI_FSI_STATUS, + &status); + if (rc) + return rc; + + if (status & SPI_FSI_STATUS_ANY_ERROR) { + rc = fsi_spi_reset(ctx); + if (rc) + return rc; + + return -EREMOTEIO; + } + } while (status & SPI_FSI_STATUS_TDR_FULL); + + sent += nb; + } + } else if (transfer->rx_buf) { + int recv = 0; + u64 in = 0ULL; + u8 *rx = transfer->rx_buf; + + rc = fsi_spi_read_reg(ctx, SPI_FSI_COUNTER_CFG, &cfg); + if (rc) + return rc; + + if (cfg & SPI_FSI_COUNTER_CFG_N2_IMPLICIT) { + rc = fsi_spi_write_reg(ctx, SPI_FSI_DATA_TX, 0); + if (rc) + return rc; + } + + while (transfer->len > recv) { + do { + rc = fsi_spi_read_reg(ctx, SPI_FSI_STATUS, + &status); + if (rc) + return rc; + + if (status & SPI_FSI_STATUS_ANY_ERROR) { + rc = fsi_spi_reset(ctx); + if (rc) + return rc; + + return -EREMOTEIO; + } + } while (!(status & SPI_FSI_STATUS_RDR_FULL)); + + rc = fsi_spi_read_reg(ctx, SPI_FSI_DATA_RX, &in); + if (rc) + return rc; + + recv += fsi_spi_data_in(in, &rx[recv], + (int)transfer->len - recv); + } + } + + return 0; +} + +static int fsi_spi_transfer_init(struct fsi_spi *ctx) +{ + int rc; + bool reset = false; + unsigned long end; + u64 seq_state; + u64 clock_cfg = 0ULL; + u64 status = 0ULL; + u64 wanted_clock_cfg = SPI_FSI_CLOCK_CFG_ECC_DISABLE | + SPI_FSI_CLOCK_CFG_SCK_NO_DEL | + FIELD_PREP(SPI_FSI_CLOCK_CFG_SCK_DIV, 19); + + end = jiffies + msecs_to_jiffies(SPI_FSI_INIT_TIMEOUT_MS); + do { + if (time_after(jiffies, end)) + return -ETIMEDOUT; + + rc = fsi_spi_read_reg(ctx, SPI_FSI_STATUS, &status); + if (rc) + return rc; + + seq_state = status & SPI_FSI_STATUS_SEQ_STATE; + + if (status & (SPI_FSI_STATUS_ANY_ERROR | + SPI_FSI_STATUS_TDR_FULL | + SPI_FSI_STATUS_RDR_FULL)) { + if (reset) + return -EIO; + + rc = fsi_spi_reset(ctx); + if (rc) + return rc; + + reset = true; + continue; + } + } while (seq_state && (seq_state != SPI_FSI_STATUS_SEQ_STATE_IDLE)); + + rc = fsi_spi_read_reg(ctx, SPI_FSI_CLOCK_CFG, &clock_cfg); + if (rc) + return rc; + + if ((clock_cfg & (SPI_FSI_CLOCK_CFG_MM_ENABLE | + SPI_FSI_CLOCK_CFG_ECC_DISABLE | + SPI_FSI_CLOCK_CFG_MODE | + SPI_FSI_CLOCK_CFG_SCK_RECV_DEL | + SPI_FSI_CLOCK_CFG_SCK_DIV)) != wanted_clock_cfg) + rc = fsi_spi_write_reg(ctx, SPI_FSI_CLOCK_CFG, + wanted_clock_cfg); + + return rc; +} + +static int fsi_spi_transfer_one_message(struct spi_controller *ctlr, + struct spi_message *mesg) +{ + int rc; + u8 seq_slave = SPI_FSI_SEQUENCE_SEL_SLAVE(mesg->spi->chip_select + 1); + struct spi_transfer *transfer; + struct fsi_spi *ctx = spi_controller_get_devdata(ctlr); + + rc = fsi_spi_check_mux(ctx->fsi, ctx->dev); + if (rc) + goto error; + + list_for_each_entry(transfer, &mesg->transfers, transfer_list) { + struct fsi_spi_sequence seq; + struct spi_transfer *next = NULL; + + /* Sequencer must do shift out (tx) first. */ + if (!transfer->tx_buf || + transfer->len > (ctx->max_xfr_size + 8)) { + rc = -EINVAL; + goto error; + } + + dev_dbg(ctx->dev, "Start tx of %d bytes.\n", transfer->len); + + rc = fsi_spi_transfer_init(ctx); + if (rc < 0) + goto error; + + fsi_spi_sequence_init(&seq); + fsi_spi_sequence_add(&seq, seq_slave); + + rc = fsi_spi_sequence_transfer(ctx, &seq, transfer); + if (rc) + goto error; + + if (!list_is_last(&transfer->transfer_list, + &mesg->transfers)) { + next = list_next_entry(transfer, transfer_list); + + /* Sequencer can only do shift in (rx) after tx. */ + if (next->rx_buf) { + if (next->len > ctx->max_xfr_size) { + rc = -EINVAL; + goto error; + } + + dev_dbg(ctx->dev, "Sequence rx of %d bytes.\n", + next->len); + + rc = fsi_spi_sequence_transfer(ctx, &seq, + next); + if (rc) + goto error; + } else { + next = NULL; + } + } + + fsi_spi_sequence_add(&seq, SPI_FSI_SEQUENCE_SEL_SLAVE(0)); + + rc = fsi_spi_write_reg(ctx, SPI_FSI_SEQUENCE, seq.data); + if (rc) + goto error; + + rc = fsi_spi_transfer_data(ctx, transfer); + if (rc) + goto error; + + if (next) { + rc = fsi_spi_transfer_data(ctx, next); + if (rc) + goto error; + + transfer = next; + } + } + +error: + mesg->status = rc; + spi_finalize_current_message(ctlr); + + return rc; +} + +static size_t fsi_spi_max_transfer_size(struct spi_device *spi) +{ + struct fsi_spi *ctx = spi_controller_get_devdata(spi->controller); + + return ctx->max_xfr_size; +} + +static int fsi_spi_probe(struct device *dev) +{ + int rc; + struct device_node *np; + int num_controllers_registered = 0; + struct fsi_device *fsi = to_fsi_dev(dev); + + rc = fsi_spi_check_mux(fsi, dev); + if (rc) + return -ENODEV; + + for_each_available_child_of_node(dev->of_node, np) { + u32 base; + struct fsi_spi *ctx; + struct spi_controller *ctlr; + + if (of_property_read_u32(np, "reg", &base)) + continue; + + ctlr = spi_alloc_master(dev, sizeof(*ctx)); + if (!ctlr) + break; + + ctlr->dev.of_node = np; + ctlr->num_chipselect = of_get_available_child_count(np) ?: 1; + ctlr->flags = SPI_CONTROLLER_HALF_DUPLEX; + ctlr->max_transfer_size = fsi_spi_max_transfer_size; + ctlr->transfer_one_message = fsi_spi_transfer_one_message; + + ctx = spi_controller_get_devdata(ctlr); + ctx->dev = &ctlr->dev; + ctx->fsi = fsi; + ctx->base = base + SPI_FSI_BASE; + + if (of_device_is_compatible(np, "ibm,fsi2spi-restricted")) { + ctx->restricted = true; + ctx->max_xfr_size = SPI_FSI_MAX_XFR_SIZE_RESTRICTED; + } else { + ctx->restricted = false; + ctx->max_xfr_size = SPI_FSI_MAX_XFR_SIZE; + } + + rc = devm_spi_register_controller(dev, ctlr); + if (rc) + spi_controller_put(ctlr); + else + num_controllers_registered++; + } + + if (!num_controllers_registered) + return -ENODEV; + + return 0; +} + +static const struct fsi_device_id fsi_spi_ids[] = { + { FSI_ENGID_SPI, FSI_VERSION_ANY }, + { } +}; +MODULE_DEVICE_TABLE(fsi, fsi_spi_ids); + +static struct fsi_driver fsi_spi_driver = { + .id_table = fsi_spi_ids, + .drv = { + .name = "spi-fsi", + .bus = &fsi_bus_type, + .probe = fsi_spi_probe, + }, +}; +module_fsi_driver(fsi_spi_driver); + +MODULE_AUTHOR("Eddie James <eajames@linux.ibm.com>"); +MODULE_DESCRIPTION("FSI attached SPI controller"); +MODULE_LICENSE("GPL"); diff --git a/drivers/spi/spi-fsl-cpm.c b/drivers/spi/spi-fsl-cpm.c new file mode 100644 index 000000000..7832ce330 --- /dev/null +++ b/drivers/spi/spi-fsl-cpm.c @@ -0,0 +1,424 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Freescale SPI controller driver cpm functions. + * + * Maintainer: Kumar Gala + * + * Copyright (C) 2006 Polycom, Inc. + * Copyright 2010 Freescale Semiconductor, Inc. + * + * CPM SPI and QE buffer descriptors mode support: + * Copyright (c) 2009 MontaVista Software, Inc. + * Author: Anton Vorontsov <avorontsov@ru.mvista.com> + */ +#include <asm/cpm.h> +#include <soc/fsl/qe/qe.h> +#include <linux/dma-mapping.h> +#include <linux/fsl_devices.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/of_address.h> +#include <linux/spi/spi.h> +#include <linux/types.h> +#include <linux/platform_device.h> +#include <linux/byteorder/generic.h> + +#include "spi-fsl-cpm.h" +#include "spi-fsl-lib.h" +#include "spi-fsl-spi.h" + +/* CPM1 and CPM2 are mutually exclusive. */ +#ifdef CONFIG_CPM1 +#include <asm/cpm1.h> +#define CPM_SPI_CMD mk_cr_cmd(CPM_CR_CH_SPI, 0) +#else +#include <asm/cpm2.h> +#define CPM_SPI_CMD mk_cr_cmd(CPM_CR_SPI_PAGE, CPM_CR_SPI_SBLOCK, 0, 0) +#endif + +#define SPIE_TXB 0x00000200 /* Last char is written to tx fifo */ +#define SPIE_RXB 0x00000100 /* Last char is written to rx buf */ + +/* SPCOM register values */ +#define SPCOM_STR (1 << 23) /* Start transmit */ + +#define SPI_PRAM_SIZE 0x100 +#define SPI_MRBLR ((unsigned int)PAGE_SIZE) + +static void *fsl_dummy_rx; +static DEFINE_MUTEX(fsl_dummy_rx_lock); +static int fsl_dummy_rx_refcnt; + +void fsl_spi_cpm_reinit_txrx(struct mpc8xxx_spi *mspi) +{ + if (mspi->flags & SPI_QE) { + qe_issue_cmd(QE_INIT_TX_RX, mspi->subblock, + QE_CR_PROTOCOL_UNSPECIFIED, 0); + } else { + if (mspi->flags & SPI_CPM1) { + out_be32(&mspi->pram->rstate, 0); + out_be16(&mspi->pram->rbptr, + in_be16(&mspi->pram->rbase)); + out_be32(&mspi->pram->tstate, 0); + out_be16(&mspi->pram->tbptr, + in_be16(&mspi->pram->tbase)); + } else { + cpm_command(CPM_SPI_CMD, CPM_CR_INIT_TRX); + } + } +} +EXPORT_SYMBOL_GPL(fsl_spi_cpm_reinit_txrx); + +static void fsl_spi_cpm_bufs_start(struct mpc8xxx_spi *mspi) +{ + struct cpm_buf_desc __iomem *tx_bd = mspi->tx_bd; + struct cpm_buf_desc __iomem *rx_bd = mspi->rx_bd; + unsigned int xfer_len = min(mspi->count, SPI_MRBLR); + unsigned int xfer_ofs; + struct fsl_spi_reg *reg_base = mspi->reg_base; + + xfer_ofs = mspi->xfer_in_progress->len - mspi->count; + + if (mspi->rx_dma == mspi->dma_dummy_rx) + out_be32(&rx_bd->cbd_bufaddr, mspi->rx_dma); + else + out_be32(&rx_bd->cbd_bufaddr, mspi->rx_dma + xfer_ofs); + out_be16(&rx_bd->cbd_datlen, 0); + out_be16(&rx_bd->cbd_sc, BD_SC_EMPTY | BD_SC_INTRPT | BD_SC_WRAP); + + if (mspi->tx_dma == mspi->dma_dummy_tx) + out_be32(&tx_bd->cbd_bufaddr, mspi->tx_dma); + else + out_be32(&tx_bd->cbd_bufaddr, mspi->tx_dma + xfer_ofs); + out_be16(&tx_bd->cbd_datlen, xfer_len); + out_be16(&tx_bd->cbd_sc, BD_SC_READY | BD_SC_INTRPT | BD_SC_WRAP | + BD_SC_LAST); + + /* start transfer */ + mpc8xxx_spi_write_reg(®_base->command, SPCOM_STR); +} + +int fsl_spi_cpm_bufs(struct mpc8xxx_spi *mspi, + struct spi_transfer *t, bool is_dma_mapped) +{ + struct device *dev = mspi->dev; + struct fsl_spi_reg *reg_base = mspi->reg_base; + + if (is_dma_mapped) { + mspi->map_tx_dma = 0; + mspi->map_rx_dma = 0; + } else { + mspi->map_tx_dma = 1; + mspi->map_rx_dma = 1; + } + + if (!t->tx_buf) { + mspi->tx_dma = mspi->dma_dummy_tx; + mspi->map_tx_dma = 0; + } + + if (!t->rx_buf) { + mspi->rx_dma = mspi->dma_dummy_rx; + mspi->map_rx_dma = 0; + } + if (t->bits_per_word == 16 && t->tx_buf) { + const u16 *src = t->tx_buf; + u16 *dst; + int i; + + dst = kmalloc(t->len, GFP_KERNEL); + if (!dst) + return -ENOMEM; + + for (i = 0; i < t->len >> 1; i++) + dst[i] = cpu_to_le16p(src + i); + + mspi->tx = dst; + mspi->map_tx_dma = 1; + } + + if (mspi->map_tx_dma) { + void *nonconst_tx = (void *)mspi->tx; /* shut up gcc */ + + mspi->tx_dma = dma_map_single(dev, nonconst_tx, t->len, + DMA_TO_DEVICE); + if (dma_mapping_error(dev, mspi->tx_dma)) { + dev_err(dev, "unable to map tx dma\n"); + return -ENOMEM; + } + } else if (t->tx_buf) { + mspi->tx_dma = t->tx_dma; + } + + if (mspi->map_rx_dma) { + mspi->rx_dma = dma_map_single(dev, mspi->rx, t->len, + DMA_FROM_DEVICE); + if (dma_mapping_error(dev, mspi->rx_dma)) { + dev_err(dev, "unable to map rx dma\n"); + goto err_rx_dma; + } + } else if (t->rx_buf) { + mspi->rx_dma = t->rx_dma; + } + + /* enable rx ints */ + mpc8xxx_spi_write_reg(®_base->mask, SPIE_RXB); + + mspi->xfer_in_progress = t; + mspi->count = t->len; + + /* start CPM transfers */ + fsl_spi_cpm_bufs_start(mspi); + + return 0; + +err_rx_dma: + if (mspi->map_tx_dma) + dma_unmap_single(dev, mspi->tx_dma, t->len, DMA_TO_DEVICE); + return -ENOMEM; +} +EXPORT_SYMBOL_GPL(fsl_spi_cpm_bufs); + +void fsl_spi_cpm_bufs_complete(struct mpc8xxx_spi *mspi) +{ + struct device *dev = mspi->dev; + struct spi_transfer *t = mspi->xfer_in_progress; + + if (mspi->map_tx_dma) + dma_unmap_single(dev, mspi->tx_dma, t->len, DMA_TO_DEVICE); + if (mspi->map_rx_dma) + dma_unmap_single(dev, mspi->rx_dma, t->len, DMA_FROM_DEVICE); + mspi->xfer_in_progress = NULL; + + if (t->bits_per_word == 16 && t->rx_buf) { + int i; + + for (i = 0; i < t->len; i += 2) + le16_to_cpus(t->rx_buf + i); + } +} +EXPORT_SYMBOL_GPL(fsl_spi_cpm_bufs_complete); + +void fsl_spi_cpm_irq(struct mpc8xxx_spi *mspi, u32 events) +{ + u16 len; + struct fsl_spi_reg *reg_base = mspi->reg_base; + + dev_dbg(mspi->dev, "%s: bd datlen %d, count %d\n", __func__, + in_be16(&mspi->rx_bd->cbd_datlen), mspi->count); + + len = in_be16(&mspi->rx_bd->cbd_datlen); + if (len > mspi->count) { + WARN_ON(1); + len = mspi->count; + } + + /* Clear the events */ + mpc8xxx_spi_write_reg(®_base->event, events); + + mspi->count -= len; + if (mspi->count) + fsl_spi_cpm_bufs_start(mspi); + else + complete(&mspi->done); +} +EXPORT_SYMBOL_GPL(fsl_spi_cpm_irq); + +static void *fsl_spi_alloc_dummy_rx(void) +{ + mutex_lock(&fsl_dummy_rx_lock); + + if (!fsl_dummy_rx) + fsl_dummy_rx = kmalloc(SPI_MRBLR, GFP_KERNEL); + if (fsl_dummy_rx) + fsl_dummy_rx_refcnt++; + + mutex_unlock(&fsl_dummy_rx_lock); + + return fsl_dummy_rx; +} + +static void fsl_spi_free_dummy_rx(void) +{ + mutex_lock(&fsl_dummy_rx_lock); + + switch (fsl_dummy_rx_refcnt) { + case 0: + WARN_ON(1); + break; + case 1: + kfree(fsl_dummy_rx); + fsl_dummy_rx = NULL; + fallthrough; + default: + fsl_dummy_rx_refcnt--; + break; + } + + mutex_unlock(&fsl_dummy_rx_lock); +} + +static unsigned long fsl_spi_cpm_get_pram(struct mpc8xxx_spi *mspi) +{ + struct device *dev = mspi->dev; + struct device_node *np = dev->of_node; + const u32 *iprop; + int size; + void __iomem *spi_base; + unsigned long pram_ofs = -ENOMEM; + + /* Can't use of_address_to_resource(), QE muram isn't at 0. */ + iprop = of_get_property(np, "reg", &size); + + /* QE with a fixed pram location? */ + if (mspi->flags & SPI_QE && iprop && size == sizeof(*iprop) * 4) + return cpm_muram_alloc_fixed(iprop[2], SPI_PRAM_SIZE); + + /* QE but with a dynamic pram location? */ + if (mspi->flags & SPI_QE) { + pram_ofs = cpm_muram_alloc(SPI_PRAM_SIZE, 64); + qe_issue_cmd(QE_ASSIGN_PAGE_TO_DEVICE, mspi->subblock, + QE_CR_PROTOCOL_UNSPECIFIED, pram_ofs); + return pram_ofs; + } + + spi_base = of_iomap(np, 1); + if (spi_base == NULL) + return -EINVAL; + + if (mspi->flags & SPI_CPM2) { + pram_ofs = cpm_muram_alloc(SPI_PRAM_SIZE, 64); + out_be16(spi_base, pram_ofs); + } + + iounmap(spi_base); + return pram_ofs; +} + +int fsl_spi_cpm_init(struct mpc8xxx_spi *mspi) +{ + struct device *dev = mspi->dev; + struct device_node *np = dev->of_node; + const u32 *iprop; + int size; + unsigned long bds_ofs; + + if (!(mspi->flags & SPI_CPM_MODE)) + return 0; + + if (!fsl_spi_alloc_dummy_rx()) + return -ENOMEM; + + if (mspi->flags & SPI_QE) { + iprop = of_get_property(np, "cell-index", &size); + if (iprop && size == sizeof(*iprop)) + mspi->subblock = *iprop; + + switch (mspi->subblock) { + default: + dev_warn(dev, "cell-index unspecified, assuming SPI1\n"); + fallthrough; + case 0: + mspi->subblock = QE_CR_SUBBLOCK_SPI1; + break; + case 1: + mspi->subblock = QE_CR_SUBBLOCK_SPI2; + break; + } + } + + if (mspi->flags & SPI_CPM1) { + void *pram; + + pram = devm_platform_ioremap_resource(to_platform_device(dev), + 1); + if (IS_ERR(pram)) + mspi->pram = NULL; + else + mspi->pram = pram; + } else { + unsigned long pram_ofs = fsl_spi_cpm_get_pram(mspi); + + if (IS_ERR_VALUE(pram_ofs)) + mspi->pram = NULL; + else + mspi->pram = cpm_muram_addr(pram_ofs); + } + if (mspi->pram == NULL) { + dev_err(dev, "can't allocate spi parameter ram\n"); + goto err_pram; + } + + bds_ofs = cpm_muram_alloc(sizeof(*mspi->tx_bd) + + sizeof(*mspi->rx_bd), 8); + if (IS_ERR_VALUE(bds_ofs)) { + dev_err(dev, "can't allocate bds\n"); + goto err_bds; + } + + mspi->dma_dummy_tx = dma_map_single(dev, empty_zero_page, PAGE_SIZE, + DMA_TO_DEVICE); + if (dma_mapping_error(dev, mspi->dma_dummy_tx)) { + dev_err(dev, "unable to map dummy tx buffer\n"); + goto err_dummy_tx; + } + + mspi->dma_dummy_rx = dma_map_single(dev, fsl_dummy_rx, SPI_MRBLR, + DMA_FROM_DEVICE); + if (dma_mapping_error(dev, mspi->dma_dummy_rx)) { + dev_err(dev, "unable to map dummy rx buffer\n"); + goto err_dummy_rx; + } + + mspi->tx_bd = cpm_muram_addr(bds_ofs); + mspi->rx_bd = cpm_muram_addr(bds_ofs + sizeof(*mspi->tx_bd)); + + /* Initialize parameter ram. */ + out_be16(&mspi->pram->tbase, cpm_muram_offset(mspi->tx_bd)); + out_be16(&mspi->pram->rbase, cpm_muram_offset(mspi->rx_bd)); + out_8(&mspi->pram->tfcr, CPMFCR_EB | CPMFCR_GBL); + out_8(&mspi->pram->rfcr, CPMFCR_EB | CPMFCR_GBL); + out_be16(&mspi->pram->mrblr, SPI_MRBLR); + out_be32(&mspi->pram->rstate, 0); + out_be32(&mspi->pram->rdp, 0); + out_be16(&mspi->pram->rbptr, 0); + out_be16(&mspi->pram->rbc, 0); + out_be32(&mspi->pram->rxtmp, 0); + out_be32(&mspi->pram->tstate, 0); + out_be32(&mspi->pram->tdp, 0); + out_be16(&mspi->pram->tbptr, 0); + out_be16(&mspi->pram->tbc, 0); + out_be32(&mspi->pram->txtmp, 0); + + return 0; + +err_dummy_rx: + dma_unmap_single(dev, mspi->dma_dummy_tx, PAGE_SIZE, DMA_TO_DEVICE); +err_dummy_tx: + cpm_muram_free(bds_ofs); +err_bds: + if (!(mspi->flags & SPI_CPM1)) + cpm_muram_free(cpm_muram_offset(mspi->pram)); +err_pram: + fsl_spi_free_dummy_rx(); + return -ENOMEM; +} +EXPORT_SYMBOL_GPL(fsl_spi_cpm_init); + +void fsl_spi_cpm_free(struct mpc8xxx_spi *mspi) +{ + struct device *dev = mspi->dev; + + if (!(mspi->flags & SPI_CPM_MODE)) + return; + + dma_unmap_single(dev, mspi->dma_dummy_rx, SPI_MRBLR, DMA_FROM_DEVICE); + dma_unmap_single(dev, mspi->dma_dummy_tx, PAGE_SIZE, DMA_TO_DEVICE); + cpm_muram_free(cpm_muram_offset(mspi->tx_bd)); + if (!(mspi->flags & SPI_CPM1)) + cpm_muram_free(cpm_muram_offset(mspi->pram)); + fsl_spi_free_dummy_rx(); +} +EXPORT_SYMBOL_GPL(fsl_spi_cpm_free); + +MODULE_LICENSE("GPL"); diff --git a/drivers/spi/spi-fsl-cpm.h b/drivers/spi/spi-fsl-cpm.h new file mode 100644 index 000000000..160f99970 --- /dev/null +++ b/drivers/spi/spi-fsl-cpm.h @@ -0,0 +1,39 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +/* + * Freescale SPI controller driver cpm functions. + * + * Maintainer: Kumar Gala + * + * Copyright (C) 2006 Polycom, Inc. + * Copyright 2010 Freescale Semiconductor, Inc. + * + * CPM SPI and QE buffer descriptors mode support: + * Copyright (c) 2009 MontaVista Software, Inc. + * Author: Anton Vorontsov <avorontsov@ru.mvista.com> + */ + +#ifndef __SPI_FSL_CPM_H__ +#define __SPI_FSL_CPM_H__ + +#include "spi-fsl-lib.h" + +#ifdef CONFIG_FSL_SOC +extern void fsl_spi_cpm_reinit_txrx(struct mpc8xxx_spi *mspi); +extern int fsl_spi_cpm_bufs(struct mpc8xxx_spi *mspi, + struct spi_transfer *t, bool is_dma_mapped); +extern void fsl_spi_cpm_bufs_complete(struct mpc8xxx_spi *mspi); +extern void fsl_spi_cpm_irq(struct mpc8xxx_spi *mspi, u32 events); +extern int fsl_spi_cpm_init(struct mpc8xxx_spi *mspi); +extern void fsl_spi_cpm_free(struct mpc8xxx_spi *mspi); +#else +static inline void fsl_spi_cpm_reinit_txrx(struct mpc8xxx_spi *mspi) { } +static inline int fsl_spi_cpm_bufs(struct mpc8xxx_spi *mspi, + struct spi_transfer *t, + bool is_dma_mapped) { return 0; } +static inline void fsl_spi_cpm_bufs_complete(struct mpc8xxx_spi *mspi) { } +static inline void fsl_spi_cpm_irq(struct mpc8xxx_spi *mspi, u32 events) { } +static inline int fsl_spi_cpm_init(struct mpc8xxx_spi *mspi) { return 0; } +static inline void fsl_spi_cpm_free(struct mpc8xxx_spi *mspi) { } +#endif + +#endif /* __SPI_FSL_CPM_H__ */ diff --git a/drivers/spi/spi-fsl-dspi.c b/drivers/spi/spi-fsl-dspi.c new file mode 100644 index 000000000..0d9201a29 --- /dev/null +++ b/drivers/spi/spi-fsl-dspi.c @@ -0,0 +1,1453 @@ +// SPDX-License-Identifier: GPL-2.0+ +// +// Copyright 2013 Freescale Semiconductor, Inc. +// Copyright 2020 NXP +// +// Freescale DSPI driver +// This file contains a driver for the Freescale DSPI + +#include <linux/clk.h> +#include <linux/delay.h> +#include <linux/dmaengine.h> +#include <linux/dma-mapping.h> +#include <linux/interrupt.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/of_device.h> +#include <linux/pinctrl/consumer.h> +#include <linux/regmap.h> +#include <linux/spi/spi.h> +#include <linux/spi/spi-fsl-dspi.h> + +#define DRIVER_NAME "fsl-dspi" + +#define SPI_MCR 0x00 +#define SPI_MCR_MASTER BIT(31) +#define SPI_MCR_PCSIS(x) ((x) << 16) +#define SPI_MCR_CLR_TXF BIT(11) +#define SPI_MCR_CLR_RXF BIT(10) +#define SPI_MCR_XSPI BIT(3) +#define SPI_MCR_DIS_TXF BIT(13) +#define SPI_MCR_DIS_RXF BIT(12) +#define SPI_MCR_HALT BIT(0) + +#define SPI_TCR 0x08 +#define SPI_TCR_GET_TCNT(x) (((x) & GENMASK(31, 16)) >> 16) + +#define SPI_CTAR(x) (0x0c + (((x) & GENMASK(1, 0)) * 4)) +#define SPI_CTAR_FMSZ(x) (((x) << 27) & GENMASK(30, 27)) +#define SPI_CTAR_CPOL BIT(26) +#define SPI_CTAR_CPHA BIT(25) +#define SPI_CTAR_LSBFE BIT(24) +#define SPI_CTAR_PCSSCK(x) (((x) << 22) & GENMASK(23, 22)) +#define SPI_CTAR_PASC(x) (((x) << 20) & GENMASK(21, 20)) +#define SPI_CTAR_PDT(x) (((x) << 18) & GENMASK(19, 18)) +#define SPI_CTAR_PBR(x) (((x) << 16) & GENMASK(17, 16)) +#define SPI_CTAR_CSSCK(x) (((x) << 12) & GENMASK(15, 12)) +#define SPI_CTAR_ASC(x) (((x) << 8) & GENMASK(11, 8)) +#define SPI_CTAR_DT(x) (((x) << 4) & GENMASK(7, 4)) +#define SPI_CTAR_BR(x) ((x) & GENMASK(3, 0)) +#define SPI_CTAR_SCALE_BITS 0xf + +#define SPI_CTAR0_SLAVE 0x0c + +#define SPI_SR 0x2c +#define SPI_SR_TCFQF BIT(31) +#define SPI_SR_TFUF BIT(27) +#define SPI_SR_TFFF BIT(25) +#define SPI_SR_CMDTCF BIT(23) +#define SPI_SR_SPEF BIT(21) +#define SPI_SR_RFOF BIT(19) +#define SPI_SR_TFIWF BIT(18) +#define SPI_SR_RFDF BIT(17) +#define SPI_SR_CMDFFF BIT(16) +#define SPI_SR_CLEAR (SPI_SR_TCFQF | \ + SPI_SR_TFUF | SPI_SR_TFFF | \ + SPI_SR_CMDTCF | SPI_SR_SPEF | \ + SPI_SR_RFOF | SPI_SR_TFIWF | \ + SPI_SR_RFDF | SPI_SR_CMDFFF) + +#define SPI_RSER_TFFFE BIT(25) +#define SPI_RSER_TFFFD BIT(24) +#define SPI_RSER_RFDFE BIT(17) +#define SPI_RSER_RFDFD BIT(16) + +#define SPI_RSER 0x30 +#define SPI_RSER_TCFQE BIT(31) +#define SPI_RSER_CMDTCFE BIT(23) + +#define SPI_PUSHR 0x34 +#define SPI_PUSHR_CMD_CONT BIT(15) +#define SPI_PUSHR_CMD_CTAS(x) (((x) << 12 & GENMASK(14, 12))) +#define SPI_PUSHR_CMD_EOQ BIT(11) +#define SPI_PUSHR_CMD_CTCNT BIT(10) +#define SPI_PUSHR_CMD_PCS(x) (BIT(x) & GENMASK(5, 0)) + +#define SPI_PUSHR_SLAVE 0x34 + +#define SPI_POPR 0x38 + +#define SPI_TXFR0 0x3c +#define SPI_TXFR1 0x40 +#define SPI_TXFR2 0x44 +#define SPI_TXFR3 0x48 +#define SPI_RXFR0 0x7c +#define SPI_RXFR1 0x80 +#define SPI_RXFR2 0x84 +#define SPI_RXFR3 0x88 + +#define SPI_CTARE(x) (0x11c + (((x) & GENMASK(1, 0)) * 4)) +#define SPI_CTARE_FMSZE(x) (((x) & 0x1) << 16) +#define SPI_CTARE_DTCP(x) ((x) & 0x7ff) + +#define SPI_SREX 0x13c + +#define SPI_FRAME_BITS(bits) SPI_CTAR_FMSZ((bits) - 1) +#define SPI_FRAME_EBITS(bits) SPI_CTARE_FMSZE(((bits) - 1) >> 4) + +#define DMA_COMPLETION_TIMEOUT msecs_to_jiffies(3000) + +struct chip_data { + u32 ctar_val; +}; + +enum dspi_trans_mode { + DSPI_XSPI_MODE, + DSPI_DMA_MODE, +}; + +struct fsl_dspi_devtype_data { + enum dspi_trans_mode trans_mode; + u8 max_clock_factor; + int fifo_size; +}; + +enum { + LS1021A, + LS1012A, + LS1028A, + LS1043A, + LS1046A, + LS2080A, + LS2085A, + LX2160A, + MCF5441X, + VF610, +}; + +static const struct fsl_dspi_devtype_data devtype_data[] = { + [VF610] = { + .trans_mode = DSPI_DMA_MODE, + .max_clock_factor = 2, + .fifo_size = 4, + }, + [LS1021A] = { + /* Has A-011218 DMA erratum */ + .trans_mode = DSPI_XSPI_MODE, + .max_clock_factor = 8, + .fifo_size = 4, + }, + [LS1012A] = { + /* Has A-011218 DMA erratum */ + .trans_mode = DSPI_XSPI_MODE, + .max_clock_factor = 8, + .fifo_size = 16, + }, + [LS1028A] = { + .trans_mode = DSPI_XSPI_MODE, + .max_clock_factor = 8, + .fifo_size = 4, + }, + [LS1043A] = { + /* Has A-011218 DMA erratum */ + .trans_mode = DSPI_XSPI_MODE, + .max_clock_factor = 8, + .fifo_size = 16, + }, + [LS1046A] = { + /* Has A-011218 DMA erratum */ + .trans_mode = DSPI_XSPI_MODE, + .max_clock_factor = 8, + .fifo_size = 16, + }, + [LS2080A] = { + .trans_mode = DSPI_XSPI_MODE, + .max_clock_factor = 8, + .fifo_size = 4, + }, + [LS2085A] = { + .trans_mode = DSPI_XSPI_MODE, + .max_clock_factor = 8, + .fifo_size = 4, + }, + [LX2160A] = { + .trans_mode = DSPI_XSPI_MODE, + .max_clock_factor = 8, + .fifo_size = 4, + }, + [MCF5441X] = { + .trans_mode = DSPI_DMA_MODE, + .max_clock_factor = 8, + .fifo_size = 16, + }, +}; + +struct fsl_dspi_dma { + u32 *tx_dma_buf; + struct dma_chan *chan_tx; + dma_addr_t tx_dma_phys; + struct completion cmd_tx_complete; + struct dma_async_tx_descriptor *tx_desc; + + u32 *rx_dma_buf; + struct dma_chan *chan_rx; + dma_addr_t rx_dma_phys; + struct completion cmd_rx_complete; + struct dma_async_tx_descriptor *rx_desc; +}; + +struct fsl_dspi { + struct spi_controller *ctlr; + struct platform_device *pdev; + + struct regmap *regmap; + struct regmap *regmap_pushr; + int irq; + struct clk *clk; + + struct spi_transfer *cur_transfer; + struct spi_message *cur_msg; + struct chip_data *cur_chip; + size_t progress; + size_t len; + const void *tx; + void *rx; + u16 tx_cmd; + const struct fsl_dspi_devtype_data *devtype_data; + + struct completion xfer_done; + + struct fsl_dspi_dma *dma; + + int oper_word_size; + int oper_bits_per_word; + + int words_in_flight; + + /* + * Offsets for CMD and TXDATA within SPI_PUSHR when accessed + * individually (in XSPI mode) + */ + int pushr_cmd; + int pushr_tx; + + void (*host_to_dev)(struct fsl_dspi *dspi, u32 *txdata); + void (*dev_to_host)(struct fsl_dspi *dspi, u32 rxdata); +}; + +static void dspi_native_host_to_dev(struct fsl_dspi *dspi, u32 *txdata) +{ + switch (dspi->oper_word_size) { + case 1: + *txdata = *(u8 *)dspi->tx; + break; + case 2: + *txdata = *(u16 *)dspi->tx; + break; + case 4: + *txdata = *(u32 *)dspi->tx; + break; + } + dspi->tx += dspi->oper_word_size; +} + +static void dspi_native_dev_to_host(struct fsl_dspi *dspi, u32 rxdata) +{ + switch (dspi->oper_word_size) { + case 1: + *(u8 *)dspi->rx = rxdata; + break; + case 2: + *(u16 *)dspi->rx = rxdata; + break; + case 4: + *(u32 *)dspi->rx = rxdata; + break; + } + dspi->rx += dspi->oper_word_size; +} + +static void dspi_8on32_host_to_dev(struct fsl_dspi *dspi, u32 *txdata) +{ + *txdata = cpu_to_be32(*(u32 *)dspi->tx); + dspi->tx += sizeof(u32); +} + +static void dspi_8on32_dev_to_host(struct fsl_dspi *dspi, u32 rxdata) +{ + *(u32 *)dspi->rx = be32_to_cpu(rxdata); + dspi->rx += sizeof(u32); +} + +static void dspi_8on16_host_to_dev(struct fsl_dspi *dspi, u32 *txdata) +{ + *txdata = cpu_to_be16(*(u16 *)dspi->tx); + dspi->tx += sizeof(u16); +} + +static void dspi_8on16_dev_to_host(struct fsl_dspi *dspi, u32 rxdata) +{ + *(u16 *)dspi->rx = be16_to_cpu(rxdata); + dspi->rx += sizeof(u16); +} + +static void dspi_16on32_host_to_dev(struct fsl_dspi *dspi, u32 *txdata) +{ + u16 hi = *(u16 *)dspi->tx; + u16 lo = *(u16 *)(dspi->tx + 2); + + *txdata = (u32)hi << 16 | lo; + dspi->tx += sizeof(u32); +} + +static void dspi_16on32_dev_to_host(struct fsl_dspi *dspi, u32 rxdata) +{ + u16 hi = rxdata & 0xffff; + u16 lo = rxdata >> 16; + + *(u16 *)dspi->rx = lo; + *(u16 *)(dspi->rx + 2) = hi; + dspi->rx += sizeof(u32); +} + +/* + * Pop one word from the TX buffer for pushing into the + * PUSHR register (TX FIFO) + */ +static u32 dspi_pop_tx(struct fsl_dspi *dspi) +{ + u32 txdata = 0; + + if (dspi->tx) + dspi->host_to_dev(dspi, &txdata); + dspi->len -= dspi->oper_word_size; + return txdata; +} + +/* Prepare one TX FIFO entry (txdata plus cmd) */ +static u32 dspi_pop_tx_pushr(struct fsl_dspi *dspi) +{ + u16 cmd = dspi->tx_cmd, data = dspi_pop_tx(dspi); + + if (spi_controller_is_slave(dspi->ctlr)) + return data; + + if (dspi->len > 0) + cmd |= SPI_PUSHR_CMD_CONT; + return cmd << 16 | data; +} + +/* Push one word to the RX buffer from the POPR register (RX FIFO) */ +static void dspi_push_rx(struct fsl_dspi *dspi, u32 rxdata) +{ + if (!dspi->rx) + return; + dspi->dev_to_host(dspi, rxdata); +} + +static void dspi_tx_dma_callback(void *arg) +{ + struct fsl_dspi *dspi = arg; + struct fsl_dspi_dma *dma = dspi->dma; + + complete(&dma->cmd_tx_complete); +} + +static void dspi_rx_dma_callback(void *arg) +{ + struct fsl_dspi *dspi = arg; + struct fsl_dspi_dma *dma = dspi->dma; + int i; + + if (dspi->rx) { + for (i = 0; i < dspi->words_in_flight; i++) + dspi_push_rx(dspi, dspi->dma->rx_dma_buf[i]); + } + + complete(&dma->cmd_rx_complete); +} + +static int dspi_next_xfer_dma_submit(struct fsl_dspi *dspi) +{ + struct device *dev = &dspi->pdev->dev; + struct fsl_dspi_dma *dma = dspi->dma; + int time_left; + int i; + + for (i = 0; i < dspi->words_in_flight; i++) + dspi->dma->tx_dma_buf[i] = dspi_pop_tx_pushr(dspi); + + dma->tx_desc = dmaengine_prep_slave_single(dma->chan_tx, + dma->tx_dma_phys, + dspi->words_in_flight * + DMA_SLAVE_BUSWIDTH_4_BYTES, + DMA_MEM_TO_DEV, + DMA_PREP_INTERRUPT | DMA_CTRL_ACK); + if (!dma->tx_desc) { + dev_err(dev, "Not able to get desc for DMA xfer\n"); + return -EIO; + } + + dma->tx_desc->callback = dspi_tx_dma_callback; + dma->tx_desc->callback_param = dspi; + if (dma_submit_error(dmaengine_submit(dma->tx_desc))) { + dev_err(dev, "DMA submit failed\n"); + return -EINVAL; + } + + dma->rx_desc = dmaengine_prep_slave_single(dma->chan_rx, + dma->rx_dma_phys, + dspi->words_in_flight * + DMA_SLAVE_BUSWIDTH_4_BYTES, + DMA_DEV_TO_MEM, + DMA_PREP_INTERRUPT | DMA_CTRL_ACK); + if (!dma->rx_desc) { + dev_err(dev, "Not able to get desc for DMA xfer\n"); + return -EIO; + } + + dma->rx_desc->callback = dspi_rx_dma_callback; + dma->rx_desc->callback_param = dspi; + if (dma_submit_error(dmaengine_submit(dma->rx_desc))) { + dev_err(dev, "DMA submit failed\n"); + return -EINVAL; + } + + reinit_completion(&dspi->dma->cmd_rx_complete); + reinit_completion(&dspi->dma->cmd_tx_complete); + + dma_async_issue_pending(dma->chan_rx); + dma_async_issue_pending(dma->chan_tx); + + if (spi_controller_is_slave(dspi->ctlr)) { + wait_for_completion_interruptible(&dspi->dma->cmd_rx_complete); + return 0; + } + + time_left = wait_for_completion_timeout(&dspi->dma->cmd_tx_complete, + DMA_COMPLETION_TIMEOUT); + if (time_left == 0) { + dev_err(dev, "DMA tx timeout\n"); + dmaengine_terminate_all(dma->chan_tx); + dmaengine_terminate_all(dma->chan_rx); + return -ETIMEDOUT; + } + + time_left = wait_for_completion_timeout(&dspi->dma->cmd_rx_complete, + DMA_COMPLETION_TIMEOUT); + if (time_left == 0) { + dev_err(dev, "DMA rx timeout\n"); + dmaengine_terminate_all(dma->chan_tx); + dmaengine_terminate_all(dma->chan_rx); + return -ETIMEDOUT; + } + + return 0; +} + +static void dspi_setup_accel(struct fsl_dspi *dspi); + +static int dspi_dma_xfer(struct fsl_dspi *dspi) +{ + struct spi_message *message = dspi->cur_msg; + struct device *dev = &dspi->pdev->dev; + int ret = 0; + + /* + * dspi->len gets decremented by dspi_pop_tx_pushr in + * dspi_next_xfer_dma_submit + */ + while (dspi->len) { + /* Figure out operational bits-per-word for this chunk */ + dspi_setup_accel(dspi); + + dspi->words_in_flight = dspi->len / dspi->oper_word_size; + if (dspi->words_in_flight > dspi->devtype_data->fifo_size) + dspi->words_in_flight = dspi->devtype_data->fifo_size; + + message->actual_length += dspi->words_in_flight * + dspi->oper_word_size; + + ret = dspi_next_xfer_dma_submit(dspi); + if (ret) { + dev_err(dev, "DMA transfer failed\n"); + break; + } + } + + return ret; +} + +static int dspi_request_dma(struct fsl_dspi *dspi, phys_addr_t phy_addr) +{ + int dma_bufsize = dspi->devtype_data->fifo_size * 2; + struct device *dev = &dspi->pdev->dev; + struct dma_slave_config cfg; + struct fsl_dspi_dma *dma; + int ret; + + dma = devm_kzalloc(dev, sizeof(*dma), GFP_KERNEL); + if (!dma) + return -ENOMEM; + + dma->chan_rx = dma_request_chan(dev, "rx"); + if (IS_ERR(dma->chan_rx)) { + dev_err(dev, "rx dma channel not available\n"); + ret = PTR_ERR(dma->chan_rx); + return ret; + } + + dma->chan_tx = dma_request_chan(dev, "tx"); + if (IS_ERR(dma->chan_tx)) { + dev_err(dev, "tx dma channel not available\n"); + ret = PTR_ERR(dma->chan_tx); + goto err_tx_channel; + } + + dma->tx_dma_buf = dma_alloc_coherent(dma->chan_tx->device->dev, + dma_bufsize, &dma->tx_dma_phys, + GFP_KERNEL); + if (!dma->tx_dma_buf) { + ret = -ENOMEM; + goto err_tx_dma_buf; + } + + dma->rx_dma_buf = dma_alloc_coherent(dma->chan_rx->device->dev, + dma_bufsize, &dma->rx_dma_phys, + GFP_KERNEL); + if (!dma->rx_dma_buf) { + ret = -ENOMEM; + goto err_rx_dma_buf; + } + + memset(&cfg, 0, sizeof(cfg)); + cfg.src_addr = phy_addr + SPI_POPR; + cfg.dst_addr = phy_addr + SPI_PUSHR; + cfg.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES; + cfg.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES; + cfg.src_maxburst = 1; + cfg.dst_maxburst = 1; + + cfg.direction = DMA_DEV_TO_MEM; + ret = dmaengine_slave_config(dma->chan_rx, &cfg); + if (ret) { + dev_err(dev, "can't configure rx dma channel\n"); + ret = -EINVAL; + goto err_slave_config; + } + + cfg.direction = DMA_MEM_TO_DEV; + ret = dmaengine_slave_config(dma->chan_tx, &cfg); + if (ret) { + dev_err(dev, "can't configure tx dma channel\n"); + ret = -EINVAL; + goto err_slave_config; + } + + dspi->dma = dma; + init_completion(&dma->cmd_tx_complete); + init_completion(&dma->cmd_rx_complete); + + return 0; + +err_slave_config: + dma_free_coherent(dma->chan_rx->device->dev, + dma_bufsize, dma->rx_dma_buf, dma->rx_dma_phys); +err_rx_dma_buf: + dma_free_coherent(dma->chan_tx->device->dev, + dma_bufsize, dma->tx_dma_buf, dma->tx_dma_phys); +err_tx_dma_buf: + dma_release_channel(dma->chan_tx); +err_tx_channel: + dma_release_channel(dma->chan_rx); + + devm_kfree(dev, dma); + dspi->dma = NULL; + + return ret; +} + +static void dspi_release_dma(struct fsl_dspi *dspi) +{ + int dma_bufsize = dspi->devtype_data->fifo_size * 2; + struct fsl_dspi_dma *dma = dspi->dma; + + if (!dma) + return; + + if (dma->chan_tx) { + dma_free_coherent(dma->chan_tx->device->dev, dma_bufsize, + dma->tx_dma_buf, dma->tx_dma_phys); + dma_release_channel(dma->chan_tx); + } + + if (dma->chan_rx) { + dma_free_coherent(dma->chan_rx->device->dev, dma_bufsize, + dma->rx_dma_buf, dma->rx_dma_phys); + dma_release_channel(dma->chan_rx); + } +} + +static void hz_to_spi_baud(char *pbr, char *br, int speed_hz, + unsigned long clkrate) +{ + /* Valid baud rate pre-scaler values */ + int pbr_tbl[4] = {2, 3, 5, 7}; + int brs[16] = { 2, 4, 6, 8, + 16, 32, 64, 128, + 256, 512, 1024, 2048, + 4096, 8192, 16384, 32768 }; + int scale_needed, scale, minscale = INT_MAX; + int i, j; + + scale_needed = clkrate / speed_hz; + if (clkrate % speed_hz) + scale_needed++; + + for (i = 0; i < ARRAY_SIZE(brs); i++) + for (j = 0; j < ARRAY_SIZE(pbr_tbl); j++) { + scale = brs[i] * pbr_tbl[j]; + if (scale >= scale_needed) { + if (scale < minscale) { + minscale = scale; + *br = i; + *pbr = j; + } + break; + } + } + + if (minscale == INT_MAX) { + pr_warn("Can not find valid baud rate,speed_hz is %d,clkrate is %ld, we use the max prescaler value.\n", + speed_hz, clkrate); + *pbr = ARRAY_SIZE(pbr_tbl) - 1; + *br = ARRAY_SIZE(brs) - 1; + } +} + +static void ns_delay_scale(char *psc, char *sc, int delay_ns, + unsigned long clkrate) +{ + int scale_needed, scale, minscale = INT_MAX; + int pscale_tbl[4] = {1, 3, 5, 7}; + u32 remainder; + int i, j; + + scale_needed = div_u64_rem((u64)delay_ns * clkrate, NSEC_PER_SEC, + &remainder); + if (remainder) + scale_needed++; + + for (i = 0; i < ARRAY_SIZE(pscale_tbl); i++) + for (j = 0; j <= SPI_CTAR_SCALE_BITS; j++) { + scale = pscale_tbl[i] * (2 << j); + if (scale >= scale_needed) { + if (scale < minscale) { + minscale = scale; + *psc = i; + *sc = j; + } + break; + } + } + + if (minscale == INT_MAX) { + pr_warn("Cannot find correct scale values for %dns delay at clkrate %ld, using max prescaler value", + delay_ns, clkrate); + *psc = ARRAY_SIZE(pscale_tbl) - 1; + *sc = SPI_CTAR_SCALE_BITS; + } +} + +static void dspi_pushr_cmd_write(struct fsl_dspi *dspi, u16 cmd) +{ + /* + * The only time when the PCS doesn't need continuation after this word + * is when it's last. We need to look ahead, because we actually call + * dspi_pop_tx (the function that decrements dspi->len) _after_ + * dspi_pushr_cmd_write with XSPI mode. As for how much in advance? One + * word is enough. If there's more to transmit than that, + * dspi_xspi_write will know to split the FIFO writes in 2, and + * generate a new PUSHR command with the final word that will have PCS + * deasserted (not continued) here. + */ + if (dspi->len > dspi->oper_word_size) + cmd |= SPI_PUSHR_CMD_CONT; + regmap_write(dspi->regmap_pushr, dspi->pushr_cmd, cmd); +} + +static void dspi_pushr_txdata_write(struct fsl_dspi *dspi, u16 txdata) +{ + regmap_write(dspi->regmap_pushr, dspi->pushr_tx, txdata); +} + +static void dspi_xspi_fifo_write(struct fsl_dspi *dspi, int num_words) +{ + int num_bytes = num_words * dspi->oper_word_size; + u16 tx_cmd = dspi->tx_cmd; + + /* + * If the PCS needs to de-assert (i.e. we're at the end of the buffer + * and cs_change does not want the PCS to stay on), then we need a new + * PUSHR command, since this one (for the body of the buffer) + * necessarily has the CONT bit set. + * So send one word less during this go, to force a split and a command + * with a single word next time, when CONT will be unset. + */ + if (!(dspi->tx_cmd & SPI_PUSHR_CMD_CONT) && num_bytes == dspi->len) + tx_cmd |= SPI_PUSHR_CMD_EOQ; + + /* Update CTARE */ + regmap_write(dspi->regmap, SPI_CTARE(0), + SPI_FRAME_EBITS(dspi->oper_bits_per_word) | + SPI_CTARE_DTCP(num_words)); + + /* + * Write the CMD FIFO entry first, and then the two + * corresponding TX FIFO entries (or one...). + */ + dspi_pushr_cmd_write(dspi, tx_cmd); + + /* Fill TX FIFO with as many transfers as possible */ + while (num_words--) { + u32 data = dspi_pop_tx(dspi); + + dspi_pushr_txdata_write(dspi, data & 0xFFFF); + if (dspi->oper_bits_per_word > 16) + dspi_pushr_txdata_write(dspi, data >> 16); + } +} + +static u32 dspi_popr_read(struct fsl_dspi *dspi) +{ + u32 rxdata = 0; + + regmap_read(dspi->regmap, SPI_POPR, &rxdata); + return rxdata; +} + +static void dspi_fifo_read(struct fsl_dspi *dspi) +{ + int num_fifo_entries = dspi->words_in_flight; + + /* Read one FIFO entry and push to rx buffer */ + while (num_fifo_entries--) + dspi_push_rx(dspi, dspi_popr_read(dspi)); +} + +static void dspi_setup_accel(struct fsl_dspi *dspi) +{ + struct spi_transfer *xfer = dspi->cur_transfer; + bool odd = !!(dspi->len & 1); + + /* No accel for frames not multiple of 8 bits at the moment */ + if (xfer->bits_per_word % 8) + goto no_accel; + + if (!odd && dspi->len <= dspi->devtype_data->fifo_size * 2) { + dspi->oper_bits_per_word = 16; + } else if (odd && dspi->len <= dspi->devtype_data->fifo_size) { + dspi->oper_bits_per_word = 8; + } else { + /* Start off with maximum supported by hardware */ + if (dspi->devtype_data->trans_mode == DSPI_XSPI_MODE) + dspi->oper_bits_per_word = 32; + else + dspi->oper_bits_per_word = 16; + + /* + * And go down only if the buffer can't be sent with + * words this big + */ + do { + if (dspi->len >= DIV_ROUND_UP(dspi->oper_bits_per_word, 8)) + break; + + dspi->oper_bits_per_word /= 2; + } while (dspi->oper_bits_per_word > 8); + } + + if (xfer->bits_per_word == 8 && dspi->oper_bits_per_word == 32) { + dspi->dev_to_host = dspi_8on32_dev_to_host; + dspi->host_to_dev = dspi_8on32_host_to_dev; + } else if (xfer->bits_per_word == 8 && dspi->oper_bits_per_word == 16) { + dspi->dev_to_host = dspi_8on16_dev_to_host; + dspi->host_to_dev = dspi_8on16_host_to_dev; + } else if (xfer->bits_per_word == 16 && dspi->oper_bits_per_word == 32) { + dspi->dev_to_host = dspi_16on32_dev_to_host; + dspi->host_to_dev = dspi_16on32_host_to_dev; + } else { +no_accel: + dspi->dev_to_host = dspi_native_dev_to_host; + dspi->host_to_dev = dspi_native_host_to_dev; + dspi->oper_bits_per_word = xfer->bits_per_word; + } + + dspi->oper_word_size = DIV_ROUND_UP(dspi->oper_bits_per_word, 8); + + /* + * Update CTAR here (code is common for XSPI and DMA modes). + * We will update CTARE in the portion specific to XSPI, when we + * also know the preload value (DTCP). + */ + regmap_write(dspi->regmap, SPI_CTAR(0), + dspi->cur_chip->ctar_val | + SPI_FRAME_BITS(dspi->oper_bits_per_word)); +} + +static void dspi_fifo_write(struct fsl_dspi *dspi) +{ + int num_fifo_entries = dspi->devtype_data->fifo_size; + struct spi_transfer *xfer = dspi->cur_transfer; + struct spi_message *msg = dspi->cur_msg; + int num_words, num_bytes; + + dspi_setup_accel(dspi); + + /* In XSPI mode each 32-bit word occupies 2 TX FIFO entries */ + if (dspi->oper_word_size == 4) + num_fifo_entries /= 2; + + /* + * Integer division intentionally trims off odd (or non-multiple of 4) + * numbers of bytes at the end of the buffer, which will be sent next + * time using a smaller oper_word_size. + */ + num_words = dspi->len / dspi->oper_word_size; + if (num_words > num_fifo_entries) + num_words = num_fifo_entries; + + /* Update total number of bytes that were transferred */ + num_bytes = num_words * dspi->oper_word_size; + msg->actual_length += num_bytes; + dspi->progress += num_bytes / DIV_ROUND_UP(xfer->bits_per_word, 8); + + /* + * Update shared variable for use in the next interrupt (both in + * dspi_fifo_read and in dspi_fifo_write). + */ + dspi->words_in_flight = num_words; + + spi_take_timestamp_pre(dspi->ctlr, xfer, dspi->progress, !dspi->irq); + + dspi_xspi_fifo_write(dspi, num_words); + /* + * Everything after this point is in a potential race with the next + * interrupt, so we must never use dspi->words_in_flight again since it + * might already be modified by the next dspi_fifo_write. + */ + + spi_take_timestamp_post(dspi->ctlr, dspi->cur_transfer, + dspi->progress, !dspi->irq); +} + +static int dspi_rxtx(struct fsl_dspi *dspi) +{ + dspi_fifo_read(dspi); + + if (!dspi->len) + /* Success! */ + return 0; + + dspi_fifo_write(dspi); + + return -EINPROGRESS; +} + +static int dspi_poll(struct fsl_dspi *dspi) +{ + int tries = 1000; + u32 spi_sr; + + do { + regmap_read(dspi->regmap, SPI_SR, &spi_sr); + regmap_write(dspi->regmap, SPI_SR, spi_sr); + + if (spi_sr & SPI_SR_CMDTCF) + break; + } while (--tries); + + if (!tries) + return -ETIMEDOUT; + + return dspi_rxtx(dspi); +} + +static irqreturn_t dspi_interrupt(int irq, void *dev_id) +{ + struct fsl_dspi *dspi = (struct fsl_dspi *)dev_id; + u32 spi_sr; + + regmap_read(dspi->regmap, SPI_SR, &spi_sr); + regmap_write(dspi->regmap, SPI_SR, spi_sr); + + if (!(spi_sr & SPI_SR_CMDTCF)) + return IRQ_NONE; + + if (dspi_rxtx(dspi) == 0) + complete(&dspi->xfer_done); + + return IRQ_HANDLED; +} + +static int dspi_transfer_one_message(struct spi_controller *ctlr, + struct spi_message *message) +{ + struct fsl_dspi *dspi = spi_controller_get_devdata(ctlr); + struct spi_device *spi = message->spi; + struct spi_transfer *transfer; + int status = 0; + + message->actual_length = 0; + + list_for_each_entry(transfer, &message->transfers, transfer_list) { + dspi->cur_transfer = transfer; + dspi->cur_msg = message; + dspi->cur_chip = spi_get_ctldata(spi); + /* Prepare command word for CMD FIFO */ + dspi->tx_cmd = SPI_PUSHR_CMD_CTAS(0) | + SPI_PUSHR_CMD_PCS(spi->chip_select); + if (list_is_last(&dspi->cur_transfer->transfer_list, + &dspi->cur_msg->transfers)) { + /* Leave PCS activated after last transfer when + * cs_change is set. + */ + if (transfer->cs_change) + dspi->tx_cmd |= SPI_PUSHR_CMD_CONT; + } else { + /* Keep PCS active between transfers in same message + * when cs_change is not set, and de-activate PCS + * between transfers in the same message when + * cs_change is set. + */ + if (!transfer->cs_change) + dspi->tx_cmd |= SPI_PUSHR_CMD_CONT; + } + + dspi->tx = transfer->tx_buf; + dspi->rx = transfer->rx_buf; + dspi->len = transfer->len; + dspi->progress = 0; + + regmap_update_bits(dspi->regmap, SPI_MCR, + SPI_MCR_CLR_TXF | SPI_MCR_CLR_RXF, + SPI_MCR_CLR_TXF | SPI_MCR_CLR_RXF); + + spi_take_timestamp_pre(dspi->ctlr, dspi->cur_transfer, + dspi->progress, !dspi->irq); + + if (dspi->devtype_data->trans_mode == DSPI_DMA_MODE) { + status = dspi_dma_xfer(dspi); + } else { + dspi_fifo_write(dspi); + + if (dspi->irq) { + wait_for_completion(&dspi->xfer_done); + reinit_completion(&dspi->xfer_done); + } else { + do { + status = dspi_poll(dspi); + } while (status == -EINPROGRESS); + } + } + if (status) + break; + + spi_transfer_delay_exec(transfer); + } + + message->status = status; + spi_finalize_current_message(ctlr); + + return status; +} + +static int dspi_setup(struct spi_device *spi) +{ + struct fsl_dspi *dspi = spi_controller_get_devdata(spi->controller); + u32 period_ns = DIV_ROUND_UP(NSEC_PER_SEC, spi->max_speed_hz); + unsigned char br = 0, pbr = 0, pcssck = 0, cssck = 0; + u32 quarter_period_ns = DIV_ROUND_UP(period_ns, 4); + u32 cs_sck_delay = 0, sck_cs_delay = 0; + struct fsl_dspi_platform_data *pdata; + unsigned char pasc = 0, asc = 0; + struct chip_data *chip; + unsigned long clkrate; + + /* Only alloc on first setup */ + chip = spi_get_ctldata(spi); + if (chip == NULL) { + chip = kzalloc(sizeof(struct chip_data), GFP_KERNEL); + if (!chip) + return -ENOMEM; + } + + pdata = dev_get_platdata(&dspi->pdev->dev); + + if (!pdata) { + of_property_read_u32(spi->dev.of_node, "fsl,spi-cs-sck-delay", + &cs_sck_delay); + + of_property_read_u32(spi->dev.of_node, "fsl,spi-sck-cs-delay", + &sck_cs_delay); + } else { + cs_sck_delay = pdata->cs_sck_delay; + sck_cs_delay = pdata->sck_cs_delay; + } + + /* Since tCSC and tASC apply to continuous transfers too, avoid SCK + * glitches of half a cycle by never allowing tCSC + tASC to go below + * half a SCK period. + */ + if (cs_sck_delay < quarter_period_ns) + cs_sck_delay = quarter_period_ns; + if (sck_cs_delay < quarter_period_ns) + sck_cs_delay = quarter_period_ns; + + dev_dbg(&spi->dev, + "DSPI controller timing params: CS-to-SCK delay %u ns, SCK-to-CS delay %u ns\n", + cs_sck_delay, sck_cs_delay); + + clkrate = clk_get_rate(dspi->clk); + hz_to_spi_baud(&pbr, &br, spi->max_speed_hz, clkrate); + + /* Set PCS to SCK delay scale values */ + ns_delay_scale(&pcssck, &cssck, cs_sck_delay, clkrate); + + /* Set After SCK delay scale values */ + ns_delay_scale(&pasc, &asc, sck_cs_delay, clkrate); + + chip->ctar_val = 0; + if (spi->mode & SPI_CPOL) + chip->ctar_val |= SPI_CTAR_CPOL; + if (spi->mode & SPI_CPHA) + chip->ctar_val |= SPI_CTAR_CPHA; + + if (!spi_controller_is_slave(dspi->ctlr)) { + chip->ctar_val |= SPI_CTAR_PCSSCK(pcssck) | + SPI_CTAR_CSSCK(cssck) | + SPI_CTAR_PASC(pasc) | + SPI_CTAR_ASC(asc) | + SPI_CTAR_PBR(pbr) | + SPI_CTAR_BR(br); + + if (spi->mode & SPI_LSB_FIRST) + chip->ctar_val |= SPI_CTAR_LSBFE; + } + + spi_set_ctldata(spi, chip); + + return 0; +} + +static void dspi_cleanup(struct spi_device *spi) +{ + struct chip_data *chip = spi_get_ctldata((struct spi_device *)spi); + + dev_dbg(&spi->dev, "spi_device %u.%u cleanup\n", + spi->controller->bus_num, spi->chip_select); + + kfree(chip); +} + +static const struct of_device_id fsl_dspi_dt_ids[] = { + { + .compatible = "fsl,vf610-dspi", + .data = &devtype_data[VF610], + }, { + .compatible = "fsl,ls1021a-v1.0-dspi", + .data = &devtype_data[LS1021A], + }, { + .compatible = "fsl,ls1012a-dspi", + .data = &devtype_data[LS1012A], + }, { + .compatible = "fsl,ls1028a-dspi", + .data = &devtype_data[LS1028A], + }, { + .compatible = "fsl,ls1043a-dspi", + .data = &devtype_data[LS1043A], + }, { + .compatible = "fsl,ls1046a-dspi", + .data = &devtype_data[LS1046A], + }, { + .compatible = "fsl,ls2080a-dspi", + .data = &devtype_data[LS2080A], + }, { + .compatible = "fsl,ls2085a-dspi", + .data = &devtype_data[LS2085A], + }, { + .compatible = "fsl,lx2160a-dspi", + .data = &devtype_data[LX2160A], + }, + { /* sentinel */ } +}; +MODULE_DEVICE_TABLE(of, fsl_dspi_dt_ids); + +#ifdef CONFIG_PM_SLEEP +static int dspi_suspend(struct device *dev) +{ + struct fsl_dspi *dspi = dev_get_drvdata(dev); + + if (dspi->irq) + disable_irq(dspi->irq); + spi_controller_suspend(dspi->ctlr); + clk_disable_unprepare(dspi->clk); + + pinctrl_pm_select_sleep_state(dev); + + return 0; +} + +static int dspi_resume(struct device *dev) +{ + struct fsl_dspi *dspi = dev_get_drvdata(dev); + int ret; + + pinctrl_pm_select_default_state(dev); + + ret = clk_prepare_enable(dspi->clk); + if (ret) + return ret; + spi_controller_resume(dspi->ctlr); + if (dspi->irq) + enable_irq(dspi->irq); + + return 0; +} +#endif /* CONFIG_PM_SLEEP */ + +static SIMPLE_DEV_PM_OPS(dspi_pm, dspi_suspend, dspi_resume); + +static const struct regmap_range dspi_volatile_ranges[] = { + regmap_reg_range(SPI_MCR, SPI_TCR), + regmap_reg_range(SPI_SR, SPI_SR), + regmap_reg_range(SPI_PUSHR, SPI_RXFR3), +}; + +static const struct regmap_access_table dspi_volatile_table = { + .yes_ranges = dspi_volatile_ranges, + .n_yes_ranges = ARRAY_SIZE(dspi_volatile_ranges), +}; + +static const struct regmap_config dspi_regmap_config = { + .reg_bits = 32, + .val_bits = 32, + .reg_stride = 4, + .max_register = 0x88, + .volatile_table = &dspi_volatile_table, +}; + +static const struct regmap_range dspi_xspi_volatile_ranges[] = { + regmap_reg_range(SPI_MCR, SPI_TCR), + regmap_reg_range(SPI_SR, SPI_SR), + regmap_reg_range(SPI_PUSHR, SPI_RXFR3), + regmap_reg_range(SPI_SREX, SPI_SREX), +}; + +static const struct regmap_access_table dspi_xspi_volatile_table = { + .yes_ranges = dspi_xspi_volatile_ranges, + .n_yes_ranges = ARRAY_SIZE(dspi_xspi_volatile_ranges), +}; + +static const struct regmap_config dspi_xspi_regmap_config[] = { + { + .reg_bits = 32, + .val_bits = 32, + .reg_stride = 4, + .max_register = 0x13c, + .volatile_table = &dspi_xspi_volatile_table, + }, + { + .name = "pushr", + .reg_bits = 16, + .val_bits = 16, + .reg_stride = 2, + .max_register = 0x2, + }, +}; + +static int dspi_init(struct fsl_dspi *dspi) +{ + unsigned int mcr; + + /* Set idle states for all chip select signals to high */ + mcr = SPI_MCR_PCSIS(GENMASK(dspi->ctlr->max_native_cs - 1, 0)); + + if (dspi->devtype_data->trans_mode == DSPI_XSPI_MODE) + mcr |= SPI_MCR_XSPI; + if (!spi_controller_is_slave(dspi->ctlr)) + mcr |= SPI_MCR_MASTER; + + regmap_write(dspi->regmap, SPI_MCR, mcr); + regmap_write(dspi->regmap, SPI_SR, SPI_SR_CLEAR); + + switch (dspi->devtype_data->trans_mode) { + case DSPI_XSPI_MODE: + regmap_write(dspi->regmap, SPI_RSER, SPI_RSER_CMDTCFE); + break; + case DSPI_DMA_MODE: + regmap_write(dspi->regmap, SPI_RSER, + SPI_RSER_TFFFE | SPI_RSER_TFFFD | + SPI_RSER_RFDFE | SPI_RSER_RFDFD); + break; + default: + dev_err(&dspi->pdev->dev, "unsupported trans_mode %u\n", + dspi->devtype_data->trans_mode); + return -EINVAL; + } + + return 0; +} + +static int dspi_slave_abort(struct spi_master *master) +{ + struct fsl_dspi *dspi = spi_master_get_devdata(master); + + /* + * Terminate all pending DMA transactions for the SPI working + * in SLAVE mode. + */ + if (dspi->devtype_data->trans_mode == DSPI_DMA_MODE) { + dmaengine_terminate_sync(dspi->dma->chan_rx); + dmaengine_terminate_sync(dspi->dma->chan_tx); + } + + /* Clear the internal DSPI RX and TX FIFO buffers */ + regmap_update_bits(dspi->regmap, SPI_MCR, + SPI_MCR_CLR_TXF | SPI_MCR_CLR_RXF, + SPI_MCR_CLR_TXF | SPI_MCR_CLR_RXF); + + return 0; +} + +static int dspi_probe(struct platform_device *pdev) +{ + struct device_node *np = pdev->dev.of_node; + const struct regmap_config *regmap_config; + struct fsl_dspi_platform_data *pdata; + struct spi_controller *ctlr; + int ret, cs_num, bus_num = -1; + struct fsl_dspi *dspi; + struct resource *res; + void __iomem *base; + bool big_endian; + + dspi = devm_kzalloc(&pdev->dev, sizeof(*dspi), GFP_KERNEL); + if (!dspi) + return -ENOMEM; + + ctlr = spi_alloc_master(&pdev->dev, 0); + if (!ctlr) + return -ENOMEM; + + spi_controller_set_devdata(ctlr, dspi); + platform_set_drvdata(pdev, dspi); + + dspi->pdev = pdev; + dspi->ctlr = ctlr; + + ctlr->setup = dspi_setup; + ctlr->transfer_one_message = dspi_transfer_one_message; + ctlr->dev.of_node = pdev->dev.of_node; + + ctlr->cleanup = dspi_cleanup; + ctlr->slave_abort = dspi_slave_abort; + ctlr->mode_bits = SPI_CPOL | SPI_CPHA | SPI_LSB_FIRST; + + pdata = dev_get_platdata(&pdev->dev); + if (pdata) { + ctlr->num_chipselect = ctlr->max_native_cs = pdata->cs_num; + ctlr->bus_num = pdata->bus_num; + + /* Only Coldfire uses platform data */ + dspi->devtype_data = &devtype_data[MCF5441X]; + big_endian = true; + } else { + + ret = of_property_read_u32(np, "spi-num-chipselects", &cs_num); + if (ret < 0) { + dev_err(&pdev->dev, "can't get spi-num-chipselects\n"); + goto out_ctlr_put; + } + ctlr->num_chipselect = ctlr->max_native_cs = cs_num; + + of_property_read_u32(np, "bus-num", &bus_num); + ctlr->bus_num = bus_num; + + if (of_property_read_bool(np, "spi-slave")) + ctlr->slave = true; + + dspi->devtype_data = of_device_get_match_data(&pdev->dev); + if (!dspi->devtype_data) { + dev_err(&pdev->dev, "can't get devtype_data\n"); + ret = -EFAULT; + goto out_ctlr_put; + } + + big_endian = of_device_is_big_endian(np); + } + if (big_endian) { + dspi->pushr_cmd = 0; + dspi->pushr_tx = 2; + } else { + dspi->pushr_cmd = 2; + dspi->pushr_tx = 0; + } + + if (dspi->devtype_data->trans_mode == DSPI_XSPI_MODE) + ctlr->bits_per_word_mask = SPI_BPW_RANGE_MASK(4, 32); + else + ctlr->bits_per_word_mask = SPI_BPW_RANGE_MASK(4, 16); + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + base = devm_ioremap_resource(&pdev->dev, res); + if (IS_ERR(base)) { + ret = PTR_ERR(base); + goto out_ctlr_put; + } + + if (dspi->devtype_data->trans_mode == DSPI_XSPI_MODE) + regmap_config = &dspi_xspi_regmap_config[0]; + else + regmap_config = &dspi_regmap_config; + dspi->regmap = devm_regmap_init_mmio(&pdev->dev, base, regmap_config); + if (IS_ERR(dspi->regmap)) { + dev_err(&pdev->dev, "failed to init regmap: %ld\n", + PTR_ERR(dspi->regmap)); + ret = PTR_ERR(dspi->regmap); + goto out_ctlr_put; + } + + if (dspi->devtype_data->trans_mode == DSPI_XSPI_MODE) { + dspi->regmap_pushr = devm_regmap_init_mmio( + &pdev->dev, base + SPI_PUSHR, + &dspi_xspi_regmap_config[1]); + if (IS_ERR(dspi->regmap_pushr)) { + dev_err(&pdev->dev, + "failed to init pushr regmap: %ld\n", + PTR_ERR(dspi->regmap_pushr)); + ret = PTR_ERR(dspi->regmap_pushr); + goto out_ctlr_put; + } + } + + dspi->clk = devm_clk_get(&pdev->dev, "dspi"); + if (IS_ERR(dspi->clk)) { + ret = PTR_ERR(dspi->clk); + dev_err(&pdev->dev, "unable to get clock\n"); + goto out_ctlr_put; + } + ret = clk_prepare_enable(dspi->clk); + if (ret) + goto out_ctlr_put; + + ret = dspi_init(dspi); + if (ret) + goto out_clk_put; + + dspi->irq = platform_get_irq(pdev, 0); + if (dspi->irq <= 0) { + dev_info(&pdev->dev, + "can't get platform irq, using poll mode\n"); + dspi->irq = 0; + goto poll_mode; + } + + init_completion(&dspi->xfer_done); + + ret = request_threaded_irq(dspi->irq, dspi_interrupt, NULL, + IRQF_SHARED, pdev->name, dspi); + if (ret < 0) { + dev_err(&pdev->dev, "Unable to attach DSPI interrupt\n"); + goto out_clk_put; + } + +poll_mode: + + if (dspi->devtype_data->trans_mode == DSPI_DMA_MODE) { + ret = dspi_request_dma(dspi, res->start); + if (ret < 0) { + dev_err(&pdev->dev, "can't get dma channels\n"); + goto out_free_irq; + } + } + + ctlr->max_speed_hz = + clk_get_rate(dspi->clk) / dspi->devtype_data->max_clock_factor; + + if (dspi->devtype_data->trans_mode != DSPI_DMA_MODE) + ctlr->ptp_sts_supported = true; + + ret = spi_register_controller(ctlr); + if (ret != 0) { + dev_err(&pdev->dev, "Problem registering DSPI ctlr\n"); + goto out_release_dma; + } + + return ret; + +out_release_dma: + dspi_release_dma(dspi); +out_free_irq: + if (dspi->irq) + free_irq(dspi->irq, dspi); +out_clk_put: + clk_disable_unprepare(dspi->clk); +out_ctlr_put: + spi_controller_put(ctlr); + + return ret; +} + +static int dspi_remove(struct platform_device *pdev) +{ + struct fsl_dspi *dspi = platform_get_drvdata(pdev); + + /* Disconnect from the SPI framework */ + spi_unregister_controller(dspi->ctlr); + + /* Disable RX and TX */ + regmap_update_bits(dspi->regmap, SPI_MCR, + SPI_MCR_DIS_TXF | SPI_MCR_DIS_RXF, + SPI_MCR_DIS_TXF | SPI_MCR_DIS_RXF); + + /* Stop Running */ + regmap_update_bits(dspi->regmap, SPI_MCR, SPI_MCR_HALT, SPI_MCR_HALT); + + dspi_release_dma(dspi); + if (dspi->irq) + free_irq(dspi->irq, dspi); + clk_disable_unprepare(dspi->clk); + + return 0; +} + +static void dspi_shutdown(struct platform_device *pdev) +{ + dspi_remove(pdev); +} + +static struct platform_driver fsl_dspi_driver = { + .driver.name = DRIVER_NAME, + .driver.of_match_table = fsl_dspi_dt_ids, + .driver.owner = THIS_MODULE, + .driver.pm = &dspi_pm, + .probe = dspi_probe, + .remove = dspi_remove, + .shutdown = dspi_shutdown, +}; +module_platform_driver(fsl_dspi_driver); + +MODULE_DESCRIPTION("Freescale DSPI Controller Driver"); +MODULE_LICENSE("GPL"); +MODULE_ALIAS("platform:" DRIVER_NAME); diff --git a/drivers/spi/spi-fsl-espi.c b/drivers/spi/spi-fsl-espi.c new file mode 100644 index 000000000..cf2b947c6 --- /dev/null +++ b/drivers/spi/spi-fsl-espi.c @@ -0,0 +1,853 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Freescale eSPI controller driver. + * + * Copyright 2010 Freescale Semiconductor, Inc. + */ +#include <linux/delay.h> +#include <linux/err.h> +#include <linux/fsl_devices.h> +#include <linux/interrupt.h> +#include <linux/module.h> +#include <linux/mm.h> +#include <linux/of.h> +#include <linux/of_address.h> +#include <linux/of_irq.h> +#include <linux/of_platform.h> +#include <linux/platform_device.h> +#include <linux/spi/spi.h> +#include <linux/pm_runtime.h> +#include <sysdev/fsl_soc.h> + +/* eSPI Controller registers */ +#define ESPI_SPMODE 0x00 /* eSPI mode register */ +#define ESPI_SPIE 0x04 /* eSPI event register */ +#define ESPI_SPIM 0x08 /* eSPI mask register */ +#define ESPI_SPCOM 0x0c /* eSPI command register */ +#define ESPI_SPITF 0x10 /* eSPI transmit FIFO access register*/ +#define ESPI_SPIRF 0x14 /* eSPI receive FIFO access register*/ +#define ESPI_SPMODE0 0x20 /* eSPI cs0 mode register */ + +#define ESPI_SPMODEx(x) (ESPI_SPMODE0 + (x) * 4) + +/* eSPI Controller mode register definitions */ +#define SPMODE_ENABLE BIT(31) +#define SPMODE_LOOP BIT(30) +#define SPMODE_TXTHR(x) ((x) << 8) +#define SPMODE_RXTHR(x) ((x) << 0) + +/* eSPI Controller CS mode register definitions */ +#define CSMODE_CI_INACTIVEHIGH BIT(31) +#define CSMODE_CP_BEGIN_EDGECLK BIT(30) +#define CSMODE_REV BIT(29) +#define CSMODE_DIV16 BIT(28) +#define CSMODE_PM(x) ((x) << 24) +#define CSMODE_POL_1 BIT(20) +#define CSMODE_LEN(x) ((x) << 16) +#define CSMODE_BEF(x) ((x) << 12) +#define CSMODE_AFT(x) ((x) << 8) +#define CSMODE_CG(x) ((x) << 3) + +#define FSL_ESPI_FIFO_SIZE 32 +#define FSL_ESPI_RXTHR 15 + +/* Default mode/csmode for eSPI controller */ +#define SPMODE_INIT_VAL (SPMODE_TXTHR(4) | SPMODE_RXTHR(FSL_ESPI_RXTHR)) +#define CSMODE_INIT_VAL (CSMODE_POL_1 | CSMODE_BEF(0) \ + | CSMODE_AFT(0) | CSMODE_CG(1)) + +/* SPIE register values */ +#define SPIE_RXCNT(reg) ((reg >> 24) & 0x3F) +#define SPIE_TXCNT(reg) ((reg >> 16) & 0x3F) +#define SPIE_TXE BIT(15) /* TX FIFO empty */ +#define SPIE_DON BIT(14) /* TX done */ +#define SPIE_RXT BIT(13) /* RX FIFO threshold */ +#define SPIE_RXF BIT(12) /* RX FIFO full */ +#define SPIE_TXT BIT(11) /* TX FIFO threshold*/ +#define SPIE_RNE BIT(9) /* RX FIFO not empty */ +#define SPIE_TNF BIT(8) /* TX FIFO not full */ + +/* SPIM register values */ +#define SPIM_TXE BIT(15) /* TX FIFO empty */ +#define SPIM_DON BIT(14) /* TX done */ +#define SPIM_RXT BIT(13) /* RX FIFO threshold */ +#define SPIM_RXF BIT(12) /* RX FIFO full */ +#define SPIM_TXT BIT(11) /* TX FIFO threshold*/ +#define SPIM_RNE BIT(9) /* RX FIFO not empty */ +#define SPIM_TNF BIT(8) /* TX FIFO not full */ + +/* SPCOM register values */ +#define SPCOM_CS(x) ((x) << 30) +#define SPCOM_DO BIT(28) /* Dual output */ +#define SPCOM_TO BIT(27) /* TX only */ +#define SPCOM_RXSKIP(x) ((x) << 16) +#define SPCOM_TRANLEN(x) ((x) << 0) + +#define SPCOM_TRANLEN_MAX 0x10000 /* Max transaction length */ + +#define AUTOSUSPEND_TIMEOUT 2000 + +struct fsl_espi { + struct device *dev; + void __iomem *reg_base; + + struct list_head *m_transfers; + struct spi_transfer *tx_t; + unsigned int tx_pos; + bool tx_done; + struct spi_transfer *rx_t; + unsigned int rx_pos; + bool rx_done; + + bool swab; + unsigned int rxskip; + + spinlock_t lock; + + u32 spibrg; /* SPIBRG input clock */ + + struct completion done; +}; + +struct fsl_espi_cs { + u32 hw_mode; +}; + +static inline u32 fsl_espi_read_reg(struct fsl_espi *espi, int offset) +{ + return ioread32be(espi->reg_base + offset); +} + +static inline u16 fsl_espi_read_reg16(struct fsl_espi *espi, int offset) +{ + return ioread16be(espi->reg_base + offset); +} + +static inline u8 fsl_espi_read_reg8(struct fsl_espi *espi, int offset) +{ + return ioread8(espi->reg_base + offset); +} + +static inline void fsl_espi_write_reg(struct fsl_espi *espi, int offset, + u32 val) +{ + iowrite32be(val, espi->reg_base + offset); +} + +static inline void fsl_espi_write_reg16(struct fsl_espi *espi, int offset, + u16 val) +{ + iowrite16be(val, espi->reg_base + offset); +} + +static inline void fsl_espi_write_reg8(struct fsl_espi *espi, int offset, + u8 val) +{ + iowrite8(val, espi->reg_base + offset); +} + +static int fsl_espi_check_message(struct spi_message *m) +{ + struct fsl_espi *espi = spi_master_get_devdata(m->spi->master); + struct spi_transfer *t, *first; + + if (m->frame_length > SPCOM_TRANLEN_MAX) { + dev_err(espi->dev, "message too long, size is %u bytes\n", + m->frame_length); + return -EMSGSIZE; + } + + first = list_first_entry(&m->transfers, struct spi_transfer, + transfer_list); + + list_for_each_entry(t, &m->transfers, transfer_list) { + if (first->bits_per_word != t->bits_per_word || + first->speed_hz != t->speed_hz) { + dev_err(espi->dev, "bits_per_word/speed_hz should be the same for all transfers\n"); + return -EINVAL; + } + } + + /* ESPI supports MSB-first transfers for word size 8 / 16 only */ + if (!(m->spi->mode & SPI_LSB_FIRST) && first->bits_per_word != 8 && + first->bits_per_word != 16) { + dev_err(espi->dev, + "MSB-first transfer not supported for wordsize %u\n", + first->bits_per_word); + return -EINVAL; + } + + return 0; +} + +static unsigned int fsl_espi_check_rxskip_mode(struct spi_message *m) +{ + struct spi_transfer *t; + unsigned int i = 0, rxskip = 0; + + /* + * prerequisites for ESPI rxskip mode: + * - message has two transfers + * - first transfer is a write and second is a read + * + * In addition the current low-level transfer mechanism requires + * that the rxskip bytes fit into the TX FIFO. Else the transfer + * would hang because after the first FSL_ESPI_FIFO_SIZE bytes + * the TX FIFO isn't re-filled. + */ + list_for_each_entry(t, &m->transfers, transfer_list) { + if (i == 0) { + if (!t->tx_buf || t->rx_buf || + t->len > FSL_ESPI_FIFO_SIZE) + return 0; + rxskip = t->len; + } else if (i == 1) { + if (t->tx_buf || !t->rx_buf) + return 0; + } + i++; + } + + return i == 2 ? rxskip : 0; +} + +static void fsl_espi_fill_tx_fifo(struct fsl_espi *espi, u32 events) +{ + u32 tx_fifo_avail; + unsigned int tx_left; + const void *tx_buf; + + /* if events is zero transfer has not started and tx fifo is empty */ + tx_fifo_avail = events ? SPIE_TXCNT(events) : FSL_ESPI_FIFO_SIZE; +start: + tx_left = espi->tx_t->len - espi->tx_pos; + tx_buf = espi->tx_t->tx_buf; + while (tx_fifo_avail >= min(4U, tx_left) && tx_left) { + if (tx_left >= 4) { + if (!tx_buf) + fsl_espi_write_reg(espi, ESPI_SPITF, 0); + else if (espi->swab) + fsl_espi_write_reg(espi, ESPI_SPITF, + swahb32p(tx_buf + espi->tx_pos)); + else + fsl_espi_write_reg(espi, ESPI_SPITF, + *(u32 *)(tx_buf + espi->tx_pos)); + espi->tx_pos += 4; + tx_left -= 4; + tx_fifo_avail -= 4; + } else if (tx_left >= 2 && tx_buf && espi->swab) { + fsl_espi_write_reg16(espi, ESPI_SPITF, + swab16p(tx_buf + espi->tx_pos)); + espi->tx_pos += 2; + tx_left -= 2; + tx_fifo_avail -= 2; + } else { + if (!tx_buf) + fsl_espi_write_reg8(espi, ESPI_SPITF, 0); + else + fsl_espi_write_reg8(espi, ESPI_SPITF, + *(u8 *)(tx_buf + espi->tx_pos)); + espi->tx_pos += 1; + tx_left -= 1; + tx_fifo_avail -= 1; + } + } + + if (!tx_left) { + /* Last transfer finished, in rxskip mode only one is needed */ + if (list_is_last(&espi->tx_t->transfer_list, + espi->m_transfers) || espi->rxskip) { + espi->tx_done = true; + return; + } + espi->tx_t = list_next_entry(espi->tx_t, transfer_list); + espi->tx_pos = 0; + /* continue with next transfer if tx fifo is not full */ + if (tx_fifo_avail) + goto start; + } +} + +static void fsl_espi_read_rx_fifo(struct fsl_espi *espi, u32 events) +{ + u32 rx_fifo_avail = SPIE_RXCNT(events); + unsigned int rx_left; + void *rx_buf; + +start: + rx_left = espi->rx_t->len - espi->rx_pos; + rx_buf = espi->rx_t->rx_buf; + while (rx_fifo_avail >= min(4U, rx_left) && rx_left) { + if (rx_left >= 4) { + u32 val = fsl_espi_read_reg(espi, ESPI_SPIRF); + + if (rx_buf && espi->swab) + *(u32 *)(rx_buf + espi->rx_pos) = swahb32(val); + else if (rx_buf) + *(u32 *)(rx_buf + espi->rx_pos) = val; + espi->rx_pos += 4; + rx_left -= 4; + rx_fifo_avail -= 4; + } else if (rx_left >= 2 && rx_buf && espi->swab) { + u16 val = fsl_espi_read_reg16(espi, ESPI_SPIRF); + + *(u16 *)(rx_buf + espi->rx_pos) = swab16(val); + espi->rx_pos += 2; + rx_left -= 2; + rx_fifo_avail -= 2; + } else { + u8 val = fsl_espi_read_reg8(espi, ESPI_SPIRF); + + if (rx_buf) + *(u8 *)(rx_buf + espi->rx_pos) = val; + espi->rx_pos += 1; + rx_left -= 1; + rx_fifo_avail -= 1; + } + } + + if (!rx_left) { + if (list_is_last(&espi->rx_t->transfer_list, + espi->m_transfers)) { + espi->rx_done = true; + return; + } + espi->rx_t = list_next_entry(espi->rx_t, transfer_list); + espi->rx_pos = 0; + /* continue with next transfer if rx fifo is not empty */ + if (rx_fifo_avail) + goto start; + } +} + +static void fsl_espi_setup_transfer(struct spi_device *spi, + struct spi_transfer *t) +{ + struct fsl_espi *espi = spi_master_get_devdata(spi->master); + int bits_per_word = t ? t->bits_per_word : spi->bits_per_word; + u32 pm, hz = t ? t->speed_hz : spi->max_speed_hz; + struct fsl_espi_cs *cs = spi_get_ctldata(spi); + u32 hw_mode_old = cs->hw_mode; + + /* mask out bits we are going to set */ + cs->hw_mode &= ~(CSMODE_LEN(0xF) | CSMODE_DIV16 | CSMODE_PM(0xF)); + + cs->hw_mode |= CSMODE_LEN(bits_per_word - 1); + + pm = DIV_ROUND_UP(espi->spibrg, hz * 4) - 1; + + if (pm > 15) { + cs->hw_mode |= CSMODE_DIV16; + pm = DIV_ROUND_UP(espi->spibrg, hz * 16 * 4) - 1; + } + + cs->hw_mode |= CSMODE_PM(pm); + + /* don't write the mode register if the mode doesn't change */ + if (cs->hw_mode != hw_mode_old) + fsl_espi_write_reg(espi, ESPI_SPMODEx(spi->chip_select), + cs->hw_mode); +} + +static int fsl_espi_bufs(struct spi_device *spi, struct spi_transfer *t) +{ + struct fsl_espi *espi = spi_master_get_devdata(spi->master); + unsigned int rx_len = t->len; + u32 mask, spcom; + int ret; + + reinit_completion(&espi->done); + + /* Set SPCOM[CS] and SPCOM[TRANLEN] field */ + spcom = SPCOM_CS(spi->chip_select); + spcom |= SPCOM_TRANLEN(t->len - 1); + + /* configure RXSKIP mode */ + if (espi->rxskip) { + spcom |= SPCOM_RXSKIP(espi->rxskip); + rx_len = t->len - espi->rxskip; + if (t->rx_nbits == SPI_NBITS_DUAL) + spcom |= SPCOM_DO; + } + + fsl_espi_write_reg(espi, ESPI_SPCOM, spcom); + + /* enable interrupts */ + mask = SPIM_DON; + if (rx_len > FSL_ESPI_FIFO_SIZE) + mask |= SPIM_RXT; + fsl_espi_write_reg(espi, ESPI_SPIM, mask); + + /* Prevent filling the fifo from getting interrupted */ + spin_lock_irq(&espi->lock); + fsl_espi_fill_tx_fifo(espi, 0); + spin_unlock_irq(&espi->lock); + + /* Won't hang up forever, SPI bus sometimes got lost interrupts... */ + ret = wait_for_completion_timeout(&espi->done, 2 * HZ); + if (ret == 0) + dev_err(espi->dev, "Transfer timed out!\n"); + + /* disable rx ints */ + fsl_espi_write_reg(espi, ESPI_SPIM, 0); + + return ret == 0 ? -ETIMEDOUT : 0; +} + +static int fsl_espi_trans(struct spi_message *m, struct spi_transfer *trans) +{ + struct fsl_espi *espi = spi_master_get_devdata(m->spi->master); + struct spi_device *spi = m->spi; + int ret; + + /* In case of LSB-first and bits_per_word > 8 byte-swap all words */ + espi->swab = spi->mode & SPI_LSB_FIRST && trans->bits_per_word > 8; + + espi->m_transfers = &m->transfers; + espi->tx_t = list_first_entry(&m->transfers, struct spi_transfer, + transfer_list); + espi->tx_pos = 0; + espi->tx_done = false; + espi->rx_t = list_first_entry(&m->transfers, struct spi_transfer, + transfer_list); + espi->rx_pos = 0; + espi->rx_done = false; + + espi->rxskip = fsl_espi_check_rxskip_mode(m); + if (trans->rx_nbits == SPI_NBITS_DUAL && !espi->rxskip) { + dev_err(espi->dev, "Dual output mode requires RXSKIP mode!\n"); + return -EINVAL; + } + + /* In RXSKIP mode skip first transfer for reads */ + if (espi->rxskip) + espi->rx_t = list_next_entry(espi->rx_t, transfer_list); + + fsl_espi_setup_transfer(spi, trans); + + ret = fsl_espi_bufs(spi, trans); + + spi_transfer_delay_exec(trans); + + return ret; +} + +static int fsl_espi_do_one_msg(struct spi_master *master, + struct spi_message *m) +{ + unsigned int delay_usecs = 0, rx_nbits = 0; + unsigned int delay_nsecs = 0, delay_nsecs1 = 0; + struct spi_transfer *t, trans = {}; + int ret; + + ret = fsl_espi_check_message(m); + if (ret) + goto out; + + list_for_each_entry(t, &m->transfers, transfer_list) { + if (t->delay_usecs) { + if (t->delay_usecs > delay_usecs) { + delay_usecs = t->delay_usecs; + delay_nsecs = delay_usecs * 1000; + } + } else { + delay_nsecs1 = spi_delay_to_ns(&t->delay, t); + if (delay_nsecs1 > delay_nsecs) + delay_nsecs = delay_nsecs1; + } + if (t->rx_nbits > rx_nbits) + rx_nbits = t->rx_nbits; + } + + t = list_first_entry(&m->transfers, struct spi_transfer, + transfer_list); + + trans.len = m->frame_length; + trans.speed_hz = t->speed_hz; + trans.bits_per_word = t->bits_per_word; + trans.delay.value = delay_nsecs; + trans.delay.unit = SPI_DELAY_UNIT_NSECS; + trans.rx_nbits = rx_nbits; + + if (trans.len) + ret = fsl_espi_trans(m, &trans); + + m->actual_length = ret ? 0 : trans.len; +out: + if (m->status == -EINPROGRESS) + m->status = ret; + + spi_finalize_current_message(master); + + return ret; +} + +static int fsl_espi_setup(struct spi_device *spi) +{ + struct fsl_espi *espi; + u32 loop_mode; + struct fsl_espi_cs *cs = spi_get_ctldata(spi); + + if (!cs) { + cs = kzalloc(sizeof(*cs), GFP_KERNEL); + if (!cs) + return -ENOMEM; + spi_set_ctldata(spi, cs); + } + + espi = spi_master_get_devdata(spi->master); + + pm_runtime_get_sync(espi->dev); + + cs->hw_mode = fsl_espi_read_reg(espi, ESPI_SPMODEx(spi->chip_select)); + /* mask out bits we are going to set */ + cs->hw_mode &= ~(CSMODE_CP_BEGIN_EDGECLK | CSMODE_CI_INACTIVEHIGH + | CSMODE_REV); + + if (spi->mode & SPI_CPHA) + cs->hw_mode |= CSMODE_CP_BEGIN_EDGECLK; + if (spi->mode & SPI_CPOL) + cs->hw_mode |= CSMODE_CI_INACTIVEHIGH; + if (!(spi->mode & SPI_LSB_FIRST)) + cs->hw_mode |= CSMODE_REV; + + /* Handle the loop mode */ + loop_mode = fsl_espi_read_reg(espi, ESPI_SPMODE); + loop_mode &= ~SPMODE_LOOP; + if (spi->mode & SPI_LOOP) + loop_mode |= SPMODE_LOOP; + fsl_espi_write_reg(espi, ESPI_SPMODE, loop_mode); + + fsl_espi_setup_transfer(spi, NULL); + + pm_runtime_mark_last_busy(espi->dev); + pm_runtime_put_autosuspend(espi->dev); + + return 0; +} + +static void fsl_espi_cleanup(struct spi_device *spi) +{ + struct fsl_espi_cs *cs = spi_get_ctldata(spi); + + kfree(cs); + spi_set_ctldata(spi, NULL); +} + +static void fsl_espi_cpu_irq(struct fsl_espi *espi, u32 events) +{ + if (!espi->rx_done) + fsl_espi_read_rx_fifo(espi, events); + + if (!espi->tx_done) + fsl_espi_fill_tx_fifo(espi, events); + + if (!espi->tx_done || !espi->rx_done) + return; + + /* we're done, but check for errors before returning */ + events = fsl_espi_read_reg(espi, ESPI_SPIE); + + if (!(events & SPIE_DON)) + dev_err(espi->dev, + "Transfer done but SPIE_DON isn't set!\n"); + + if (SPIE_RXCNT(events) || SPIE_TXCNT(events) != FSL_ESPI_FIFO_SIZE) { + dev_err(espi->dev, "Transfer done but rx/tx fifo's aren't empty!\n"); + dev_err(espi->dev, "SPIE_RXCNT = %d, SPIE_TXCNT = %d\n", + SPIE_RXCNT(events), SPIE_TXCNT(events)); + } + + complete(&espi->done); +} + +static irqreturn_t fsl_espi_irq(s32 irq, void *context_data) +{ + struct fsl_espi *espi = context_data; + u32 events, mask; + + spin_lock(&espi->lock); + + /* Get interrupt events(tx/rx) */ + events = fsl_espi_read_reg(espi, ESPI_SPIE); + mask = fsl_espi_read_reg(espi, ESPI_SPIM); + if (!(events & mask)) { + spin_unlock(&espi->lock); + return IRQ_NONE; + } + + dev_vdbg(espi->dev, "%s: events %x\n", __func__, events); + + fsl_espi_cpu_irq(espi, events); + + /* Clear the events */ + fsl_espi_write_reg(espi, ESPI_SPIE, events); + + spin_unlock(&espi->lock); + + return IRQ_HANDLED; +} + +#ifdef CONFIG_PM +static int fsl_espi_runtime_suspend(struct device *dev) +{ + struct spi_master *master = dev_get_drvdata(dev); + struct fsl_espi *espi = spi_master_get_devdata(master); + u32 regval; + + regval = fsl_espi_read_reg(espi, ESPI_SPMODE); + regval &= ~SPMODE_ENABLE; + fsl_espi_write_reg(espi, ESPI_SPMODE, regval); + + return 0; +} + +static int fsl_espi_runtime_resume(struct device *dev) +{ + struct spi_master *master = dev_get_drvdata(dev); + struct fsl_espi *espi = spi_master_get_devdata(master); + u32 regval; + + regval = fsl_espi_read_reg(espi, ESPI_SPMODE); + regval |= SPMODE_ENABLE; + fsl_espi_write_reg(espi, ESPI_SPMODE, regval); + + return 0; +} +#endif + +static size_t fsl_espi_max_message_size(struct spi_device *spi) +{ + return SPCOM_TRANLEN_MAX; +} + +static void fsl_espi_init_regs(struct device *dev, bool initial) +{ + struct spi_master *master = dev_get_drvdata(dev); + struct fsl_espi *espi = spi_master_get_devdata(master); + struct device_node *nc; + u32 csmode, cs, prop; + int ret; + + /* SPI controller initializations */ + fsl_espi_write_reg(espi, ESPI_SPMODE, 0); + fsl_espi_write_reg(espi, ESPI_SPIM, 0); + fsl_espi_write_reg(espi, ESPI_SPCOM, 0); + fsl_espi_write_reg(espi, ESPI_SPIE, 0xffffffff); + + /* Init eSPI CS mode register */ + for_each_available_child_of_node(master->dev.of_node, nc) { + /* get chip select */ + ret = of_property_read_u32(nc, "reg", &cs); + if (ret || cs >= master->num_chipselect) + continue; + + csmode = CSMODE_INIT_VAL; + + /* check if CSBEF is set in device tree */ + ret = of_property_read_u32(nc, "fsl,csbef", &prop); + if (!ret) { + csmode &= ~(CSMODE_BEF(0xf)); + csmode |= CSMODE_BEF(prop); + } + + /* check if CSAFT is set in device tree */ + ret = of_property_read_u32(nc, "fsl,csaft", &prop); + if (!ret) { + csmode &= ~(CSMODE_AFT(0xf)); + csmode |= CSMODE_AFT(prop); + } + + fsl_espi_write_reg(espi, ESPI_SPMODEx(cs), csmode); + + if (initial) + dev_info(dev, "cs=%u, init_csmode=0x%x\n", cs, csmode); + } + + /* Enable SPI interface */ + fsl_espi_write_reg(espi, ESPI_SPMODE, SPMODE_INIT_VAL | SPMODE_ENABLE); +} + +static int fsl_espi_probe(struct device *dev, struct resource *mem, + unsigned int irq, unsigned int num_cs) +{ + struct spi_master *master; + struct fsl_espi *espi; + int ret; + + master = spi_alloc_master(dev, sizeof(struct fsl_espi)); + if (!master) + return -ENOMEM; + + dev_set_drvdata(dev, master); + + master->mode_bits = SPI_RX_DUAL | SPI_CPOL | SPI_CPHA | SPI_CS_HIGH | + SPI_LSB_FIRST | SPI_LOOP; + master->dev.of_node = dev->of_node; + master->bits_per_word_mask = SPI_BPW_RANGE_MASK(4, 16); + master->setup = fsl_espi_setup; + master->cleanup = fsl_espi_cleanup; + master->transfer_one_message = fsl_espi_do_one_msg; + master->auto_runtime_pm = true; + master->max_message_size = fsl_espi_max_message_size; + master->num_chipselect = num_cs; + + espi = spi_master_get_devdata(master); + spin_lock_init(&espi->lock); + + espi->dev = dev; + espi->spibrg = fsl_get_sys_freq(); + if (espi->spibrg == -1) { + dev_err(dev, "Can't get sys frequency!\n"); + ret = -EINVAL; + goto err_probe; + } + /* determined by clock divider fields DIV16/PM in register SPMODEx */ + master->min_speed_hz = DIV_ROUND_UP(espi->spibrg, 4 * 16 * 16); + master->max_speed_hz = DIV_ROUND_UP(espi->spibrg, 4); + + init_completion(&espi->done); + + espi->reg_base = devm_ioremap_resource(dev, mem); + if (IS_ERR(espi->reg_base)) { + ret = PTR_ERR(espi->reg_base); + goto err_probe; + } + + /* Register for SPI Interrupt */ + ret = devm_request_irq(dev, irq, fsl_espi_irq, 0, "fsl_espi", espi); + if (ret) + goto err_probe; + + fsl_espi_init_regs(dev, true); + + pm_runtime_set_autosuspend_delay(dev, AUTOSUSPEND_TIMEOUT); + pm_runtime_use_autosuspend(dev); + pm_runtime_set_active(dev); + pm_runtime_enable(dev); + pm_runtime_get_sync(dev); + + ret = devm_spi_register_master(dev, master); + if (ret < 0) + goto err_pm; + + dev_info(dev, "irq = %u\n", irq); + + pm_runtime_mark_last_busy(dev); + pm_runtime_put_autosuspend(dev); + + return 0; + +err_pm: + pm_runtime_put_noidle(dev); + pm_runtime_disable(dev); + pm_runtime_set_suspended(dev); +err_probe: + spi_master_put(master); + return ret; +} + +static int of_fsl_espi_get_chipselects(struct device *dev) +{ + struct device_node *np = dev->of_node; + u32 num_cs; + int ret; + + ret = of_property_read_u32(np, "fsl,espi-num-chipselects", &num_cs); + if (ret) { + dev_err(dev, "No 'fsl,espi-num-chipselects' property\n"); + return 0; + } + + return num_cs; +} + +static int of_fsl_espi_probe(struct platform_device *ofdev) +{ + struct device *dev = &ofdev->dev; + struct device_node *np = ofdev->dev.of_node; + struct resource mem; + unsigned int irq, num_cs; + int ret; + + if (of_property_read_bool(np, "mode")) { + dev_err(dev, "mode property is not supported on ESPI!\n"); + return -EINVAL; + } + + num_cs = of_fsl_espi_get_chipselects(dev); + if (!num_cs) + return -EINVAL; + + ret = of_address_to_resource(np, 0, &mem); + if (ret) + return ret; + + irq = irq_of_parse_and_map(np, 0); + if (!irq) + return -EINVAL; + + return fsl_espi_probe(dev, &mem, irq, num_cs); +} + +static int of_fsl_espi_remove(struct platform_device *dev) +{ + pm_runtime_disable(&dev->dev); + + return 0; +} + +#ifdef CONFIG_PM_SLEEP +static int of_fsl_espi_suspend(struct device *dev) +{ + struct spi_master *master = dev_get_drvdata(dev); + int ret; + + ret = spi_master_suspend(master); + if (ret) + return ret; + + return pm_runtime_force_suspend(dev); +} + +static int of_fsl_espi_resume(struct device *dev) +{ + struct spi_master *master = dev_get_drvdata(dev); + int ret; + + fsl_espi_init_regs(dev, false); + + ret = pm_runtime_force_resume(dev); + if (ret < 0) + return ret; + + return spi_master_resume(master); +} +#endif /* CONFIG_PM_SLEEP */ + +static const struct dev_pm_ops espi_pm = { + SET_RUNTIME_PM_OPS(fsl_espi_runtime_suspend, + fsl_espi_runtime_resume, NULL) + SET_SYSTEM_SLEEP_PM_OPS(of_fsl_espi_suspend, of_fsl_espi_resume) +}; + +static const struct of_device_id of_fsl_espi_match[] = { + { .compatible = "fsl,mpc8536-espi" }, + {} +}; +MODULE_DEVICE_TABLE(of, of_fsl_espi_match); + +static struct platform_driver fsl_espi_driver = { + .driver = { + .name = "fsl_espi", + .of_match_table = of_fsl_espi_match, + .pm = &espi_pm, + }, + .probe = of_fsl_espi_probe, + .remove = of_fsl_espi_remove, +}; +module_platform_driver(fsl_espi_driver); + +MODULE_AUTHOR("Mingkai Hu"); +MODULE_DESCRIPTION("Enhanced Freescale SPI Driver"); +MODULE_LICENSE("GPL"); diff --git a/drivers/spi/spi-fsl-lib.c b/drivers/spi/spi-fsl-lib.c new file mode 100644 index 000000000..76e1192eb --- /dev/null +++ b/drivers/spi/spi-fsl-lib.c @@ -0,0 +1,160 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Freescale SPI/eSPI controller driver library. + * + * Maintainer: Kumar Gala + * + * Copyright (C) 2006 Polycom, Inc. + * + * CPM SPI and QE buffer descriptors mode support: + * Copyright (c) 2009 MontaVista Software, Inc. + * Author: Anton Vorontsov <avorontsov@ru.mvista.com> + * + * Copyright 2010 Freescale Semiconductor, Inc. + */ +#include <linux/dma-mapping.h> +#include <linux/fsl_devices.h> +#include <linux/interrupt.h> +#include <linux/kernel.h> +#include <linux/mm.h> +#include <linux/module.h> +#include <linux/of_platform.h> +#include <linux/spi/spi.h> +#ifdef CONFIG_FSL_SOC +#include <sysdev/fsl_soc.h> +#endif + +#include "spi-fsl-lib.h" + +#define MPC8XXX_SPI_RX_BUF(type) \ +void mpc8xxx_spi_rx_buf_##type(u32 data, struct mpc8xxx_spi *mpc8xxx_spi) \ +{ \ + type *rx = mpc8xxx_spi->rx; \ + *rx++ = (type)(data >> mpc8xxx_spi->rx_shift); \ + mpc8xxx_spi->rx = rx; \ +} \ +EXPORT_SYMBOL_GPL(mpc8xxx_spi_rx_buf_##type); + +#define MPC8XXX_SPI_TX_BUF(type) \ +u32 mpc8xxx_spi_tx_buf_##type(struct mpc8xxx_spi *mpc8xxx_spi) \ +{ \ + u32 data; \ + const type *tx = mpc8xxx_spi->tx; \ + if (!tx) \ + return 0; \ + data = *tx++ << mpc8xxx_spi->tx_shift; \ + mpc8xxx_spi->tx = tx; \ + return data; \ +} \ +EXPORT_SYMBOL_GPL(mpc8xxx_spi_tx_buf_##type); + +MPC8XXX_SPI_RX_BUF(u8) +MPC8XXX_SPI_RX_BUF(u16) +MPC8XXX_SPI_RX_BUF(u32) +MPC8XXX_SPI_TX_BUF(u8) +MPC8XXX_SPI_TX_BUF(u16) +MPC8XXX_SPI_TX_BUF(u32) + +struct mpc8xxx_spi_probe_info *to_of_pinfo(struct fsl_spi_platform_data *pdata) +{ + return container_of(pdata, struct mpc8xxx_spi_probe_info, pdata); +} +EXPORT_SYMBOL_GPL(to_of_pinfo); + +const char *mpc8xxx_spi_strmode(unsigned int flags) +{ + if (flags & SPI_QE_CPU_MODE) { + return "QE CPU"; + } else if (flags & SPI_CPM_MODE) { + if (flags & SPI_QE) + return "QE"; + else if (flags & SPI_CPM2) + return "CPM2"; + else + return "CPM1"; + } + return "CPU"; +} +EXPORT_SYMBOL_GPL(mpc8xxx_spi_strmode); + +void mpc8xxx_spi_probe(struct device *dev, struct resource *mem, + unsigned int irq) +{ + struct fsl_spi_platform_data *pdata = dev_get_platdata(dev); + struct spi_master *master; + struct mpc8xxx_spi *mpc8xxx_spi; + + master = dev_get_drvdata(dev); + + /* the spi->mode bits understood by this driver: */ + master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH + | SPI_LSB_FIRST | SPI_LOOP; + + master->dev.of_node = dev->of_node; + + mpc8xxx_spi = spi_master_get_devdata(master); + mpc8xxx_spi->dev = dev; + mpc8xxx_spi->get_rx = mpc8xxx_spi_rx_buf_u8; + mpc8xxx_spi->get_tx = mpc8xxx_spi_tx_buf_u8; + mpc8xxx_spi->flags = pdata->flags; + mpc8xxx_spi->spibrg = pdata->sysclk; + mpc8xxx_spi->irq = irq; + + mpc8xxx_spi->rx_shift = 0; + mpc8xxx_spi->tx_shift = 0; + + master->bus_num = pdata->bus_num; + master->num_chipselect = pdata->max_chipselect; + + init_completion(&mpc8xxx_spi->done); +} +EXPORT_SYMBOL_GPL(mpc8xxx_spi_probe); + +int of_mpc8xxx_spi_probe(struct platform_device *ofdev) +{ + struct device *dev = &ofdev->dev; + struct device_node *np = ofdev->dev.of_node; + struct mpc8xxx_spi_probe_info *pinfo; + struct fsl_spi_platform_data *pdata; + const void *prop; + int ret = -ENOMEM; + + pinfo = devm_kzalloc(&ofdev->dev, sizeof(*pinfo), GFP_KERNEL); + if (!pinfo) + return ret; + + pdata = &pinfo->pdata; + dev->platform_data = pdata; + + /* Allocate bus num dynamically. */ + pdata->bus_num = -1; + +#ifdef CONFIG_FSL_SOC + /* SPI controller is either clocked from QE or SoC clock. */ + pdata->sysclk = get_brgfreq(); + if (pdata->sysclk == -1) { + pdata->sysclk = fsl_get_sys_freq(); + if (pdata->sysclk == -1) + return -ENODEV; + } +#else + ret = of_property_read_u32(np, "clock-frequency", &pdata->sysclk); + if (ret) + return ret; +#endif + + prop = of_get_property(np, "mode", NULL); + if (prop && !strcmp(prop, "cpu-qe")) + pdata->flags = SPI_QE_CPU_MODE; + else if (prop && !strcmp(prop, "qe")) + pdata->flags = SPI_CPM_MODE | SPI_QE; + else if (of_device_is_compatible(np, "fsl,cpm2-spi")) + pdata->flags = SPI_CPM_MODE | SPI_CPM2; + else if (of_device_is_compatible(np, "fsl,cpm1-spi")) + pdata->flags = SPI_CPM_MODE | SPI_CPM1; + + return 0; +} +EXPORT_SYMBOL_GPL(of_mpc8xxx_spi_probe); + +MODULE_LICENSE("GPL"); diff --git a/drivers/spi/spi-fsl-lib.h b/drivers/spi/spi-fsl-lib.h new file mode 100644 index 000000000..015a1abb6 --- /dev/null +++ b/drivers/spi/spi-fsl-lib.h @@ -0,0 +1,114 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +/* + * Freescale SPI/eSPI controller driver library. + * + * Maintainer: Kumar Gala + * + * Copyright 2010 Freescale Semiconductor, Inc. + * Copyright (C) 2006 Polycom, Inc. + * + * CPM SPI and QE buffer descriptors mode support: + * Copyright (c) 2009 MontaVista Software, Inc. + * Author: Anton Vorontsov <avorontsov@ru.mvista.com> + */ +#ifndef __SPI_FSL_LIB_H__ +#define __SPI_FSL_LIB_H__ + +#include <asm/io.h> + +/* SPI/eSPI Controller driver's private data. */ +struct mpc8xxx_spi { + struct device *dev; + void __iomem *reg_base; + + /* rx & tx bufs from the spi_transfer */ + const void *tx; + void *rx; + + int subblock; + struct spi_pram __iomem *pram; +#ifdef CONFIG_FSL_SOC + struct cpm_buf_desc __iomem *tx_bd; + struct cpm_buf_desc __iomem *rx_bd; +#endif + + struct spi_transfer *xfer_in_progress; + + /* dma addresses for CPM transfers */ + dma_addr_t tx_dma; + dma_addr_t rx_dma; + bool map_tx_dma; + bool map_rx_dma; + + dma_addr_t dma_dummy_tx; + dma_addr_t dma_dummy_rx; + + /* functions to deal with different sized buffers */ + void (*get_rx) (u32 rx_data, struct mpc8xxx_spi *); + u32(*get_tx) (struct mpc8xxx_spi *); + + unsigned int count; + unsigned int irq; + + unsigned nsecs; /* (clock cycle time)/2 */ + + u32 spibrg; /* SPIBRG input clock */ + u32 rx_shift; /* RX data reg shift when in qe mode */ + u32 tx_shift; /* TX data reg shift when in qe mode */ + + unsigned int flags; + +#if IS_ENABLED(CONFIG_SPI_FSL_SPI) + int type; + int native_chipselects; + u8 max_bits_per_word; + + void (*set_shifts)(u32 *rx_shift, u32 *tx_shift, + int bits_per_word, int msb_first); +#endif + + struct completion done; +}; + +struct spi_mpc8xxx_cs { + /* functions to deal with different sized buffers */ + void (*get_rx) (u32 rx_data, struct mpc8xxx_spi *); + u32 (*get_tx) (struct mpc8xxx_spi *); + u32 rx_shift; /* RX data reg shift when in qe mode */ + u32 tx_shift; /* TX data reg shift when in qe mode */ + u32 hw_mode; /* Holds HW mode register settings */ +}; + +static inline void mpc8xxx_spi_write_reg(__be32 __iomem *reg, u32 val) +{ + iowrite32be(val, reg); +} + +static inline u32 mpc8xxx_spi_read_reg(__be32 __iomem *reg) +{ + return ioread32be(reg); +} + +struct mpc8xxx_spi_probe_info { + struct fsl_spi_platform_data pdata; + __be32 __iomem *immr_spi_cs; +}; + +extern u32 mpc8xxx_spi_tx_buf_u8(struct mpc8xxx_spi *mpc8xxx_spi); +extern u32 mpc8xxx_spi_tx_buf_u16(struct mpc8xxx_spi *mpc8xxx_spi); +extern u32 mpc8xxx_spi_tx_buf_u32(struct mpc8xxx_spi *mpc8xxx_spi); +extern void mpc8xxx_spi_rx_buf_u8(u32 data, struct mpc8xxx_spi *mpc8xxx_spi); +extern void mpc8xxx_spi_rx_buf_u16(u32 data, struct mpc8xxx_spi *mpc8xxx_spi); +extern void mpc8xxx_spi_rx_buf_u32(u32 data, struct mpc8xxx_spi *mpc8xxx_spi); + +extern struct mpc8xxx_spi_probe_info *to_of_pinfo( + struct fsl_spi_platform_data *pdata); +extern int mpc8xxx_spi_bufs(struct mpc8xxx_spi *mspi, + struct spi_transfer *t, unsigned int len); +extern const char *mpc8xxx_spi_strmode(unsigned int flags); +extern void mpc8xxx_spi_probe(struct device *dev, struct resource *mem, + unsigned int irq); +extern int mpc8xxx_spi_remove(struct device *dev); +extern int of_mpc8xxx_spi_probe(struct platform_device *ofdev); + +#endif /* __SPI_FSL_LIB_H__ */ diff --git a/drivers/spi/spi-fsl-lpspi.c b/drivers/spi/spi-fsl-lpspi.c new file mode 100644 index 000000000..c5ff6e8c4 --- /dev/null +++ b/drivers/spi/spi-fsl-lpspi.c @@ -0,0 +1,992 @@ +// SPDX-License-Identifier: GPL-2.0+ +// +// Freescale i.MX7ULP LPSPI driver +// +// Copyright 2016 Freescale Semiconductor, Inc. +// Copyright 2018 NXP Semiconductors + +#include <linux/clk.h> +#include <linux/completion.h> +#include <linux/delay.h> +#include <linux/dmaengine.h> +#include <linux/dma-mapping.h> +#include <linux/err.h> +#include <linux/interrupt.h> +#include <linux/io.h> +#include <linux/irq.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/of.h> +#include <linux/of_device.h> +#include <linux/pinctrl/consumer.h> +#include <linux/platform_device.h> +#include <linux/platform_data/dma-imx.h> +#include <linux/pm_runtime.h> +#include <linux/slab.h> +#include <linux/spi/spi.h> +#include <linux/spi/spi_bitbang.h> +#include <linux/types.h> + +#define DRIVER_NAME "fsl_lpspi" + +#define FSL_LPSPI_RPM_TIMEOUT 50 /* 50ms */ + +/* The maximum bytes that edma can transfer once.*/ +#define FSL_LPSPI_MAX_EDMA_BYTES ((1 << 15) - 1) + +/* i.MX7ULP LPSPI registers */ +#define IMX7ULP_VERID 0x0 +#define IMX7ULP_PARAM 0x4 +#define IMX7ULP_CR 0x10 +#define IMX7ULP_SR 0x14 +#define IMX7ULP_IER 0x18 +#define IMX7ULP_DER 0x1c +#define IMX7ULP_CFGR0 0x20 +#define IMX7ULP_CFGR1 0x24 +#define IMX7ULP_DMR0 0x30 +#define IMX7ULP_DMR1 0x34 +#define IMX7ULP_CCR 0x40 +#define IMX7ULP_FCR 0x58 +#define IMX7ULP_FSR 0x5c +#define IMX7ULP_TCR 0x60 +#define IMX7ULP_TDR 0x64 +#define IMX7ULP_RSR 0x70 +#define IMX7ULP_RDR 0x74 + +/* General control register field define */ +#define CR_RRF BIT(9) +#define CR_RTF BIT(8) +#define CR_RST BIT(1) +#define CR_MEN BIT(0) +#define SR_MBF BIT(24) +#define SR_TCF BIT(10) +#define SR_FCF BIT(9) +#define SR_RDF BIT(1) +#define SR_TDF BIT(0) +#define IER_TCIE BIT(10) +#define IER_FCIE BIT(9) +#define IER_RDIE BIT(1) +#define IER_TDIE BIT(0) +#define DER_RDDE BIT(1) +#define DER_TDDE BIT(0) +#define CFGR1_PCSCFG BIT(27) +#define CFGR1_PINCFG (BIT(24)|BIT(25)) +#define CFGR1_PCSPOL BIT(8) +#define CFGR1_NOSTALL BIT(3) +#define CFGR1_MASTER BIT(0) +#define FSR_TXCOUNT (0xFF) +#define RSR_RXEMPTY BIT(1) +#define TCR_CPOL BIT(31) +#define TCR_CPHA BIT(30) +#define TCR_CONT BIT(21) +#define TCR_CONTC BIT(20) +#define TCR_RXMSK BIT(19) +#define TCR_TXMSK BIT(18) + +struct lpspi_config { + u8 bpw; + u8 chip_select; + u8 prescale; + u16 mode; + u32 speed_hz; +}; + +struct fsl_lpspi_data { + struct device *dev; + void __iomem *base; + unsigned long base_phys; + struct clk *clk_ipg; + struct clk *clk_per; + bool is_slave; + bool is_only_cs1; + bool is_first_byte; + + void *rx_buf; + const void *tx_buf; + void (*tx)(struct fsl_lpspi_data *); + void (*rx)(struct fsl_lpspi_data *); + + u32 remain; + u8 watermark; + u8 txfifosize; + u8 rxfifosize; + + struct lpspi_config config; + struct completion xfer_done; + + bool slave_aborted; + + /* DMA */ + bool usedma; + struct completion dma_rx_completion; + struct completion dma_tx_completion; +}; + +static const struct of_device_id fsl_lpspi_dt_ids[] = { + { .compatible = "fsl,imx7ulp-spi", }, + { /* sentinel */ } +}; +MODULE_DEVICE_TABLE(of, fsl_lpspi_dt_ids); + +#define LPSPI_BUF_RX(type) \ +static void fsl_lpspi_buf_rx_##type(struct fsl_lpspi_data *fsl_lpspi) \ +{ \ + unsigned int val = readl(fsl_lpspi->base + IMX7ULP_RDR); \ + \ + if (fsl_lpspi->rx_buf) { \ + *(type *)fsl_lpspi->rx_buf = val; \ + fsl_lpspi->rx_buf += sizeof(type); \ + } \ +} + +#define LPSPI_BUF_TX(type) \ +static void fsl_lpspi_buf_tx_##type(struct fsl_lpspi_data *fsl_lpspi) \ +{ \ + type val = 0; \ + \ + if (fsl_lpspi->tx_buf) { \ + val = *(type *)fsl_lpspi->tx_buf; \ + fsl_lpspi->tx_buf += sizeof(type); \ + } \ + \ + fsl_lpspi->remain -= sizeof(type); \ + writel(val, fsl_lpspi->base + IMX7ULP_TDR); \ +} + +LPSPI_BUF_RX(u8) +LPSPI_BUF_TX(u8) +LPSPI_BUF_RX(u16) +LPSPI_BUF_TX(u16) +LPSPI_BUF_RX(u32) +LPSPI_BUF_TX(u32) + +static void fsl_lpspi_intctrl(struct fsl_lpspi_data *fsl_lpspi, + unsigned int enable) +{ + writel(enable, fsl_lpspi->base + IMX7ULP_IER); +} + +static int fsl_lpspi_bytes_per_word(const int bpw) +{ + return DIV_ROUND_UP(bpw, BITS_PER_BYTE); +} + +static bool fsl_lpspi_can_dma(struct spi_controller *controller, + struct spi_device *spi, + struct spi_transfer *transfer) +{ + unsigned int bytes_per_word; + + if (!controller->dma_rx) + return false; + + bytes_per_word = fsl_lpspi_bytes_per_word(transfer->bits_per_word); + + switch (bytes_per_word) { + case 1: + case 2: + case 4: + break; + default: + return false; + } + + return true; +} + +static int lpspi_prepare_xfer_hardware(struct spi_controller *controller) +{ + struct fsl_lpspi_data *fsl_lpspi = + spi_controller_get_devdata(controller); + int ret; + + ret = pm_runtime_resume_and_get(fsl_lpspi->dev); + if (ret < 0) { + dev_err(fsl_lpspi->dev, "failed to enable clock\n"); + return ret; + } + + return 0; +} + +static int lpspi_unprepare_xfer_hardware(struct spi_controller *controller) +{ + struct fsl_lpspi_data *fsl_lpspi = + spi_controller_get_devdata(controller); + + pm_runtime_mark_last_busy(fsl_lpspi->dev); + pm_runtime_put_autosuspend(fsl_lpspi->dev); + + return 0; +} + +static void fsl_lpspi_write_tx_fifo(struct fsl_lpspi_data *fsl_lpspi) +{ + u8 txfifo_cnt; + u32 temp; + + txfifo_cnt = readl(fsl_lpspi->base + IMX7ULP_FSR) & 0xff; + + while (txfifo_cnt < fsl_lpspi->txfifosize) { + if (!fsl_lpspi->remain) + break; + fsl_lpspi->tx(fsl_lpspi); + txfifo_cnt++; + } + + if (txfifo_cnt < fsl_lpspi->txfifosize) { + if (!fsl_lpspi->is_slave) { + temp = readl(fsl_lpspi->base + IMX7ULP_TCR); + temp &= ~TCR_CONTC; + writel(temp, fsl_lpspi->base + IMX7ULP_TCR); + } + + fsl_lpspi_intctrl(fsl_lpspi, IER_FCIE); + } else + fsl_lpspi_intctrl(fsl_lpspi, IER_TDIE); +} + +static void fsl_lpspi_read_rx_fifo(struct fsl_lpspi_data *fsl_lpspi) +{ + while (!(readl(fsl_lpspi->base + IMX7ULP_RSR) & RSR_RXEMPTY)) + fsl_lpspi->rx(fsl_lpspi); +} + +static void fsl_lpspi_set_cmd(struct fsl_lpspi_data *fsl_lpspi) +{ + u32 temp = 0; + + temp |= fsl_lpspi->config.bpw - 1; + temp |= (fsl_lpspi->config.mode & 0x3) << 30; + temp |= (fsl_lpspi->config.chip_select & 0x3) << 24; + if (!fsl_lpspi->is_slave) { + temp |= fsl_lpspi->config.prescale << 27; + /* + * Set TCR_CONT will keep SS asserted after current transfer. + * For the first transfer, clear TCR_CONTC to assert SS. + * For subsequent transfer, set TCR_CONTC to keep SS asserted. + */ + if (!fsl_lpspi->usedma) { + temp |= TCR_CONT; + if (fsl_lpspi->is_first_byte) + temp &= ~TCR_CONTC; + else + temp |= TCR_CONTC; + } + } + writel(temp, fsl_lpspi->base + IMX7ULP_TCR); + + dev_dbg(fsl_lpspi->dev, "TCR=0x%x\n", temp); +} + +static void fsl_lpspi_set_watermark(struct fsl_lpspi_data *fsl_lpspi) +{ + u32 temp; + + if (!fsl_lpspi->usedma) + temp = fsl_lpspi->watermark >> 1 | + (fsl_lpspi->watermark >> 1) << 16; + else + temp = fsl_lpspi->watermark >> 1; + + writel(temp, fsl_lpspi->base + IMX7ULP_FCR); + + dev_dbg(fsl_lpspi->dev, "FCR=0x%x\n", temp); +} + +static int fsl_lpspi_set_bitrate(struct fsl_lpspi_data *fsl_lpspi) +{ + struct lpspi_config config = fsl_lpspi->config; + unsigned int perclk_rate, scldiv; + u8 prescale; + + perclk_rate = clk_get_rate(fsl_lpspi->clk_per); + + if (config.speed_hz > perclk_rate / 2) { + dev_err(fsl_lpspi->dev, + "per-clk should be at least two times of transfer speed"); + return -EINVAL; + } + + for (prescale = 0; prescale < 8; prescale++) { + scldiv = perclk_rate / config.speed_hz / (1 << prescale) - 2; + if (scldiv < 256) { + fsl_lpspi->config.prescale = prescale; + break; + } + } + + if (scldiv >= 256) + return -EINVAL; + + writel(scldiv | (scldiv << 8) | ((scldiv >> 1) << 16), + fsl_lpspi->base + IMX7ULP_CCR); + + dev_dbg(fsl_lpspi->dev, "perclk=%d, speed=%d, prescale=%d, scldiv=%d\n", + perclk_rate, config.speed_hz, prescale, scldiv); + + return 0; +} + +static int fsl_lpspi_dma_configure(struct spi_controller *controller) +{ + int ret; + enum dma_slave_buswidth buswidth; + struct dma_slave_config rx = {}, tx = {}; + struct fsl_lpspi_data *fsl_lpspi = + spi_controller_get_devdata(controller); + + switch (fsl_lpspi_bytes_per_word(fsl_lpspi->config.bpw)) { + case 4: + buswidth = DMA_SLAVE_BUSWIDTH_4_BYTES; + break; + case 2: + buswidth = DMA_SLAVE_BUSWIDTH_2_BYTES; + break; + case 1: + buswidth = DMA_SLAVE_BUSWIDTH_1_BYTE; + break; + default: + return -EINVAL; + } + + tx.direction = DMA_MEM_TO_DEV; + tx.dst_addr = fsl_lpspi->base_phys + IMX7ULP_TDR; + tx.dst_addr_width = buswidth; + tx.dst_maxburst = 1; + ret = dmaengine_slave_config(controller->dma_tx, &tx); + if (ret) { + dev_err(fsl_lpspi->dev, "TX dma configuration failed with %d\n", + ret); + return ret; + } + + rx.direction = DMA_DEV_TO_MEM; + rx.src_addr = fsl_lpspi->base_phys + IMX7ULP_RDR; + rx.src_addr_width = buswidth; + rx.src_maxburst = 1; + ret = dmaengine_slave_config(controller->dma_rx, &rx); + if (ret) { + dev_err(fsl_lpspi->dev, "RX dma configuration failed with %d\n", + ret); + return ret; + } + + return 0; +} + +static int fsl_lpspi_config(struct fsl_lpspi_data *fsl_lpspi) +{ + u32 temp; + int ret; + + if (!fsl_lpspi->is_slave) { + ret = fsl_lpspi_set_bitrate(fsl_lpspi); + if (ret) + return ret; + } + + fsl_lpspi_set_watermark(fsl_lpspi); + + if (!fsl_lpspi->is_slave) + temp = CFGR1_MASTER; + else + temp = CFGR1_PINCFG; + if (fsl_lpspi->config.mode & SPI_CS_HIGH) + temp |= CFGR1_PCSPOL; + writel(temp, fsl_lpspi->base + IMX7ULP_CFGR1); + + temp = readl(fsl_lpspi->base + IMX7ULP_CR); + temp |= CR_RRF | CR_RTF | CR_MEN; + writel(temp, fsl_lpspi->base + IMX7ULP_CR); + + temp = 0; + if (fsl_lpspi->usedma) + temp = DER_TDDE | DER_RDDE; + writel(temp, fsl_lpspi->base + IMX7ULP_DER); + + return 0; +} + +static int fsl_lpspi_setup_transfer(struct spi_controller *controller, + struct spi_device *spi, + struct spi_transfer *t) +{ + struct fsl_lpspi_data *fsl_lpspi = + spi_controller_get_devdata(spi->controller); + + if (t == NULL) + return -EINVAL; + + fsl_lpspi->config.mode = spi->mode; + fsl_lpspi->config.bpw = t->bits_per_word; + fsl_lpspi->config.speed_hz = t->speed_hz; + if (fsl_lpspi->is_only_cs1) + fsl_lpspi->config.chip_select = 1; + else + fsl_lpspi->config.chip_select = spi->chip_select; + + if (!fsl_lpspi->config.speed_hz) + fsl_lpspi->config.speed_hz = spi->max_speed_hz; + if (!fsl_lpspi->config.bpw) + fsl_lpspi->config.bpw = spi->bits_per_word; + + /* Initialize the functions for transfer */ + if (fsl_lpspi->config.bpw <= 8) { + fsl_lpspi->rx = fsl_lpspi_buf_rx_u8; + fsl_lpspi->tx = fsl_lpspi_buf_tx_u8; + } else if (fsl_lpspi->config.bpw <= 16) { + fsl_lpspi->rx = fsl_lpspi_buf_rx_u16; + fsl_lpspi->tx = fsl_lpspi_buf_tx_u16; + } else { + fsl_lpspi->rx = fsl_lpspi_buf_rx_u32; + fsl_lpspi->tx = fsl_lpspi_buf_tx_u32; + } + + if (t->len <= fsl_lpspi->txfifosize) + fsl_lpspi->watermark = t->len; + else + fsl_lpspi->watermark = fsl_lpspi->txfifosize; + + if (fsl_lpspi_can_dma(controller, spi, t)) + fsl_lpspi->usedma = true; + else + fsl_lpspi->usedma = false; + + return fsl_lpspi_config(fsl_lpspi); +} + +static int fsl_lpspi_slave_abort(struct spi_controller *controller) +{ + struct fsl_lpspi_data *fsl_lpspi = + spi_controller_get_devdata(controller); + + fsl_lpspi->slave_aborted = true; + if (!fsl_lpspi->usedma) + complete(&fsl_lpspi->xfer_done); + else { + complete(&fsl_lpspi->dma_tx_completion); + complete(&fsl_lpspi->dma_rx_completion); + } + + return 0; +} + +static int fsl_lpspi_wait_for_completion(struct spi_controller *controller) +{ + struct fsl_lpspi_data *fsl_lpspi = + spi_controller_get_devdata(controller); + + if (fsl_lpspi->is_slave) { + if (wait_for_completion_interruptible(&fsl_lpspi->xfer_done) || + fsl_lpspi->slave_aborted) { + dev_dbg(fsl_lpspi->dev, "interrupted\n"); + return -EINTR; + } + } else { + if (!wait_for_completion_timeout(&fsl_lpspi->xfer_done, HZ)) { + dev_dbg(fsl_lpspi->dev, "wait for completion timeout\n"); + return -ETIMEDOUT; + } + } + + return 0; +} + +static int fsl_lpspi_reset(struct fsl_lpspi_data *fsl_lpspi) +{ + u32 temp; + + if (!fsl_lpspi->usedma) { + /* Disable all interrupt */ + fsl_lpspi_intctrl(fsl_lpspi, 0); + } + + /* W1C for all flags in SR */ + temp = 0x3F << 8; + writel(temp, fsl_lpspi->base + IMX7ULP_SR); + + /* Clear FIFO and disable module */ + temp = CR_RRF | CR_RTF; + writel(temp, fsl_lpspi->base + IMX7ULP_CR); + + return 0; +} + +static void fsl_lpspi_dma_rx_callback(void *cookie) +{ + struct fsl_lpspi_data *fsl_lpspi = (struct fsl_lpspi_data *)cookie; + + complete(&fsl_lpspi->dma_rx_completion); +} + +static void fsl_lpspi_dma_tx_callback(void *cookie) +{ + struct fsl_lpspi_data *fsl_lpspi = (struct fsl_lpspi_data *)cookie; + + complete(&fsl_lpspi->dma_tx_completion); +} + +static int fsl_lpspi_calculate_timeout(struct fsl_lpspi_data *fsl_lpspi, + int size) +{ + unsigned long timeout = 0; + + /* Time with actual data transfer and CS change delay related to HW */ + timeout = (8 + 4) * size / fsl_lpspi->config.speed_hz; + + /* Add extra second for scheduler related activities */ + timeout += 1; + + /* Double calculated timeout */ + return msecs_to_jiffies(2 * timeout * MSEC_PER_SEC); +} + +static int fsl_lpspi_dma_transfer(struct spi_controller *controller, + struct fsl_lpspi_data *fsl_lpspi, + struct spi_transfer *transfer) +{ + struct dma_async_tx_descriptor *desc_tx, *desc_rx; + unsigned long transfer_timeout; + unsigned long timeout; + struct sg_table *tx = &transfer->tx_sg, *rx = &transfer->rx_sg; + int ret; + + ret = fsl_lpspi_dma_configure(controller); + if (ret) + return ret; + + desc_rx = dmaengine_prep_slave_sg(controller->dma_rx, + rx->sgl, rx->nents, DMA_DEV_TO_MEM, + DMA_PREP_INTERRUPT | DMA_CTRL_ACK); + if (!desc_rx) + return -EINVAL; + + desc_rx->callback = fsl_lpspi_dma_rx_callback; + desc_rx->callback_param = (void *)fsl_lpspi; + dmaengine_submit(desc_rx); + reinit_completion(&fsl_lpspi->dma_rx_completion); + dma_async_issue_pending(controller->dma_rx); + + desc_tx = dmaengine_prep_slave_sg(controller->dma_tx, + tx->sgl, tx->nents, DMA_MEM_TO_DEV, + DMA_PREP_INTERRUPT | DMA_CTRL_ACK); + if (!desc_tx) { + dmaengine_terminate_all(controller->dma_tx); + return -EINVAL; + } + + desc_tx->callback = fsl_lpspi_dma_tx_callback; + desc_tx->callback_param = (void *)fsl_lpspi; + dmaengine_submit(desc_tx); + reinit_completion(&fsl_lpspi->dma_tx_completion); + dma_async_issue_pending(controller->dma_tx); + + fsl_lpspi->slave_aborted = false; + + if (!fsl_lpspi->is_slave) { + transfer_timeout = fsl_lpspi_calculate_timeout(fsl_lpspi, + transfer->len); + + /* Wait eDMA to finish the data transfer.*/ + timeout = wait_for_completion_timeout(&fsl_lpspi->dma_tx_completion, + transfer_timeout); + if (!timeout) { + dev_err(fsl_lpspi->dev, "I/O Error in DMA TX\n"); + dmaengine_terminate_all(controller->dma_tx); + dmaengine_terminate_all(controller->dma_rx); + fsl_lpspi_reset(fsl_lpspi); + return -ETIMEDOUT; + } + + timeout = wait_for_completion_timeout(&fsl_lpspi->dma_rx_completion, + transfer_timeout); + if (!timeout) { + dev_err(fsl_lpspi->dev, "I/O Error in DMA RX\n"); + dmaengine_terminate_all(controller->dma_tx); + dmaengine_terminate_all(controller->dma_rx); + fsl_lpspi_reset(fsl_lpspi); + return -ETIMEDOUT; + } + } else { + if (wait_for_completion_interruptible(&fsl_lpspi->dma_tx_completion) || + fsl_lpspi->slave_aborted) { + dev_dbg(fsl_lpspi->dev, + "I/O Error in DMA TX interrupted\n"); + dmaengine_terminate_all(controller->dma_tx); + dmaengine_terminate_all(controller->dma_rx); + fsl_lpspi_reset(fsl_lpspi); + return -EINTR; + } + + if (wait_for_completion_interruptible(&fsl_lpspi->dma_rx_completion) || + fsl_lpspi->slave_aborted) { + dev_dbg(fsl_lpspi->dev, + "I/O Error in DMA RX interrupted\n"); + dmaengine_terminate_all(controller->dma_tx); + dmaengine_terminate_all(controller->dma_rx); + fsl_lpspi_reset(fsl_lpspi); + return -EINTR; + } + } + + fsl_lpspi_reset(fsl_lpspi); + + return 0; +} + +static void fsl_lpspi_dma_exit(struct spi_controller *controller) +{ + if (controller->dma_rx) { + dma_release_channel(controller->dma_rx); + controller->dma_rx = NULL; + } + + if (controller->dma_tx) { + dma_release_channel(controller->dma_tx); + controller->dma_tx = NULL; + } +} + +static int fsl_lpspi_dma_init(struct device *dev, + struct fsl_lpspi_data *fsl_lpspi, + struct spi_controller *controller) +{ + int ret; + + /* Prepare for TX DMA: */ + controller->dma_tx = dma_request_chan(dev, "tx"); + if (IS_ERR(controller->dma_tx)) { + ret = PTR_ERR(controller->dma_tx); + dev_dbg(dev, "can't get the TX DMA channel, error %d!\n", ret); + controller->dma_tx = NULL; + goto err; + } + + /* Prepare for RX DMA: */ + controller->dma_rx = dma_request_chan(dev, "rx"); + if (IS_ERR(controller->dma_rx)) { + ret = PTR_ERR(controller->dma_rx); + dev_dbg(dev, "can't get the RX DMA channel, error %d\n", ret); + controller->dma_rx = NULL; + goto err; + } + + init_completion(&fsl_lpspi->dma_rx_completion); + init_completion(&fsl_lpspi->dma_tx_completion); + controller->can_dma = fsl_lpspi_can_dma; + controller->max_dma_len = FSL_LPSPI_MAX_EDMA_BYTES; + + return 0; +err: + fsl_lpspi_dma_exit(controller); + return ret; +} + +static int fsl_lpspi_pio_transfer(struct spi_controller *controller, + struct spi_transfer *t) +{ + struct fsl_lpspi_data *fsl_lpspi = + spi_controller_get_devdata(controller); + int ret; + + fsl_lpspi->tx_buf = t->tx_buf; + fsl_lpspi->rx_buf = t->rx_buf; + fsl_lpspi->remain = t->len; + + reinit_completion(&fsl_lpspi->xfer_done); + fsl_lpspi->slave_aborted = false; + + fsl_lpspi_write_tx_fifo(fsl_lpspi); + + ret = fsl_lpspi_wait_for_completion(controller); + if (ret) + return ret; + + fsl_lpspi_reset(fsl_lpspi); + + return 0; +} + +static int fsl_lpspi_transfer_one(struct spi_controller *controller, + struct spi_device *spi, + struct spi_transfer *t) +{ + struct fsl_lpspi_data *fsl_lpspi = + spi_controller_get_devdata(controller); + int ret; + + fsl_lpspi->is_first_byte = true; + ret = fsl_lpspi_setup_transfer(controller, spi, t); + if (ret < 0) + return ret; + + fsl_lpspi_set_cmd(fsl_lpspi); + fsl_lpspi->is_first_byte = false; + + if (fsl_lpspi->usedma) + ret = fsl_lpspi_dma_transfer(controller, fsl_lpspi, t); + else + ret = fsl_lpspi_pio_transfer(controller, t); + if (ret < 0) + return ret; + + return 0; +} + +static irqreturn_t fsl_lpspi_isr(int irq, void *dev_id) +{ + u32 temp_SR, temp_IER; + struct fsl_lpspi_data *fsl_lpspi = dev_id; + + temp_IER = readl(fsl_lpspi->base + IMX7ULP_IER); + fsl_lpspi_intctrl(fsl_lpspi, 0); + temp_SR = readl(fsl_lpspi->base + IMX7ULP_SR); + + fsl_lpspi_read_rx_fifo(fsl_lpspi); + + if ((temp_SR & SR_TDF) && (temp_IER & IER_TDIE)) { + fsl_lpspi_write_tx_fifo(fsl_lpspi); + return IRQ_HANDLED; + } + + if (temp_SR & SR_MBF || + readl(fsl_lpspi->base + IMX7ULP_FSR) & FSR_TXCOUNT) { + writel(SR_FCF, fsl_lpspi->base + IMX7ULP_SR); + fsl_lpspi_intctrl(fsl_lpspi, IER_FCIE); + return IRQ_HANDLED; + } + + if (temp_SR & SR_FCF && (temp_IER & IER_FCIE)) { + writel(SR_FCF, fsl_lpspi->base + IMX7ULP_SR); + complete(&fsl_lpspi->xfer_done); + return IRQ_HANDLED; + } + + return IRQ_NONE; +} + +#ifdef CONFIG_PM +static int fsl_lpspi_runtime_resume(struct device *dev) +{ + struct spi_controller *controller = dev_get_drvdata(dev); + struct fsl_lpspi_data *fsl_lpspi; + int ret; + + fsl_lpspi = spi_controller_get_devdata(controller); + + ret = clk_prepare_enable(fsl_lpspi->clk_per); + if (ret) + return ret; + + ret = clk_prepare_enable(fsl_lpspi->clk_ipg); + if (ret) { + clk_disable_unprepare(fsl_lpspi->clk_per); + return ret; + } + + return 0; +} + +static int fsl_lpspi_runtime_suspend(struct device *dev) +{ + struct spi_controller *controller = dev_get_drvdata(dev); + struct fsl_lpspi_data *fsl_lpspi; + + fsl_lpspi = spi_controller_get_devdata(controller); + + clk_disable_unprepare(fsl_lpspi->clk_per); + clk_disable_unprepare(fsl_lpspi->clk_ipg); + + return 0; +} +#endif + +static int fsl_lpspi_init_rpm(struct fsl_lpspi_data *fsl_lpspi) +{ + struct device *dev = fsl_lpspi->dev; + + pm_runtime_enable(dev); + pm_runtime_set_autosuspend_delay(dev, FSL_LPSPI_RPM_TIMEOUT); + pm_runtime_use_autosuspend(dev); + + return 0; +} + +static int fsl_lpspi_probe(struct platform_device *pdev) +{ + struct fsl_lpspi_data *fsl_lpspi; + struct spi_controller *controller; + struct resource *res; + int ret, irq; + u32 temp; + bool is_slave; + + is_slave = of_property_read_bool((&pdev->dev)->of_node, "spi-slave"); + if (is_slave) + controller = spi_alloc_slave(&pdev->dev, + sizeof(struct fsl_lpspi_data)); + else + controller = spi_alloc_master(&pdev->dev, + sizeof(struct fsl_lpspi_data)); + + if (!controller) + return -ENOMEM; + + platform_set_drvdata(pdev, controller); + + fsl_lpspi = spi_controller_get_devdata(controller); + fsl_lpspi->dev = &pdev->dev; + fsl_lpspi->is_slave = is_slave; + fsl_lpspi->is_only_cs1 = of_property_read_bool((&pdev->dev)->of_node, + "fsl,spi-only-use-cs1-sel"); + + controller->bits_per_word_mask = SPI_BPW_RANGE_MASK(8, 32); + controller->transfer_one = fsl_lpspi_transfer_one; + controller->prepare_transfer_hardware = lpspi_prepare_xfer_hardware; + controller->unprepare_transfer_hardware = lpspi_unprepare_xfer_hardware; + controller->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH; + controller->flags = SPI_MASTER_MUST_RX | SPI_MASTER_MUST_TX; + controller->dev.of_node = pdev->dev.of_node; + controller->bus_num = pdev->id; + controller->slave_abort = fsl_lpspi_slave_abort; + if (!fsl_lpspi->is_slave) + controller->use_gpio_descriptors = true; + + init_completion(&fsl_lpspi->xfer_done); + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + fsl_lpspi->base = devm_ioremap_resource(&pdev->dev, res); + if (IS_ERR(fsl_lpspi->base)) { + ret = PTR_ERR(fsl_lpspi->base); + goto out_controller_put; + } + fsl_lpspi->base_phys = res->start; + + irq = platform_get_irq(pdev, 0); + if (irq < 0) { + ret = irq; + goto out_controller_put; + } + + ret = devm_request_irq(&pdev->dev, irq, fsl_lpspi_isr, 0, + dev_name(&pdev->dev), fsl_lpspi); + if (ret) { + dev_err(&pdev->dev, "can't get irq%d: %d\n", irq, ret); + goto out_controller_put; + } + + fsl_lpspi->clk_per = devm_clk_get(&pdev->dev, "per"); + if (IS_ERR(fsl_lpspi->clk_per)) { + ret = PTR_ERR(fsl_lpspi->clk_per); + goto out_controller_put; + } + + fsl_lpspi->clk_ipg = devm_clk_get(&pdev->dev, "ipg"); + if (IS_ERR(fsl_lpspi->clk_ipg)) { + ret = PTR_ERR(fsl_lpspi->clk_ipg); + goto out_controller_put; + } + + /* enable the clock */ + ret = fsl_lpspi_init_rpm(fsl_lpspi); + if (ret) + goto out_controller_put; + + ret = pm_runtime_get_sync(fsl_lpspi->dev); + if (ret < 0) { + dev_err(fsl_lpspi->dev, "failed to enable clock\n"); + goto out_pm_get; + } + + temp = readl(fsl_lpspi->base + IMX7ULP_PARAM); + fsl_lpspi->txfifosize = 1 << (temp & 0x0f); + fsl_lpspi->rxfifosize = 1 << ((temp >> 8) & 0x0f); + + ret = fsl_lpspi_dma_init(&pdev->dev, fsl_lpspi, controller); + if (ret == -EPROBE_DEFER) + goto out_pm_get; + if (ret < 0) + dev_err(&pdev->dev, "dma setup error %d, use pio\n", ret); + else + /* + * disable LPSPI module IRQ when enable DMA mode successfully, + * to prevent the unexpected LPSPI module IRQ events. + */ + disable_irq(irq); + + ret = devm_spi_register_controller(&pdev->dev, controller); + if (ret < 0) { + dev_err(&pdev->dev, "spi_register_controller error.\n"); + goto out_pm_get; + } + + pm_runtime_mark_last_busy(fsl_lpspi->dev); + pm_runtime_put_autosuspend(fsl_lpspi->dev); + + return 0; + +out_pm_get: + pm_runtime_dont_use_autosuspend(fsl_lpspi->dev); + pm_runtime_put_sync(fsl_lpspi->dev); + pm_runtime_disable(fsl_lpspi->dev); +out_controller_put: + spi_controller_put(controller); + + return ret; +} + +static int fsl_lpspi_remove(struct platform_device *pdev) +{ + struct spi_controller *controller = platform_get_drvdata(pdev); + struct fsl_lpspi_data *fsl_lpspi = + spi_controller_get_devdata(controller); + + pm_runtime_disable(fsl_lpspi->dev); + return 0; +} + +static int __maybe_unused fsl_lpspi_suspend(struct device *dev) +{ + int ret; + + pinctrl_pm_select_sleep_state(dev); + ret = pm_runtime_force_suspend(dev); + return ret; +} + +static int __maybe_unused fsl_lpspi_resume(struct device *dev) +{ + int ret; + + ret = pm_runtime_force_resume(dev); + if (ret) { + dev_err(dev, "Error in resume: %d\n", ret); + return ret; + } + + pinctrl_pm_select_default_state(dev); + + return 0; +} + +static const struct dev_pm_ops fsl_lpspi_pm_ops = { + SET_RUNTIME_PM_OPS(fsl_lpspi_runtime_suspend, + fsl_lpspi_runtime_resume, NULL) + SET_SYSTEM_SLEEP_PM_OPS(fsl_lpspi_suspend, fsl_lpspi_resume) +}; + +static struct platform_driver fsl_lpspi_driver = { + .driver = { + .name = DRIVER_NAME, + .of_match_table = fsl_lpspi_dt_ids, + .pm = &fsl_lpspi_pm_ops, + }, + .probe = fsl_lpspi_probe, + .remove = fsl_lpspi_remove, +}; +module_platform_driver(fsl_lpspi_driver); + +MODULE_DESCRIPTION("LPSPI Controller driver"); +MODULE_AUTHOR("Gao Pan <pandy.gao@nxp.com>"); +MODULE_LICENSE("GPL"); diff --git a/drivers/spi/spi-fsl-qspi.c b/drivers/spi/spi-fsl-qspi.c new file mode 100644 index 000000000..46ae46a94 --- /dev/null +++ b/drivers/spi/spi-fsl-qspi.c @@ -0,0 +1,1014 @@ +// SPDX-License-Identifier: GPL-2.0+ + +/* + * Freescale QuadSPI driver. + * + * Copyright (C) 2013 Freescale Semiconductor, Inc. + * Copyright (C) 2018 Bootlin + * Copyright (C) 2018 exceet electronics GmbH + * Copyright (C) 2018 Kontron Electronics GmbH + * + * Transition to SPI MEM interface: + * Authors: + * Boris Brezillon <bbrezillon@kernel.org> + * Frieder Schrempf <frieder.schrempf@kontron.de> + * Yogesh Gaur <yogeshnarayan.gaur@nxp.com> + * Suresh Gupta <suresh.gupta@nxp.com> + * + * Based on the original fsl-quadspi.c SPI NOR driver: + * Author: Freescale Semiconductor, Inc. + * + */ + +#include <linux/bitops.h> +#include <linux/clk.h> +#include <linux/completion.h> +#include <linux/delay.h> +#include <linux/err.h> +#include <linux/errno.h> +#include <linux/interrupt.h> +#include <linux/io.h> +#include <linux/iopoll.h> +#include <linux/jiffies.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/mutex.h> +#include <linux/of.h> +#include <linux/of_device.h> +#include <linux/platform_device.h> +#include <linux/pm_qos.h> +#include <linux/sizes.h> + +#include <linux/spi/spi.h> +#include <linux/spi/spi-mem.h> + +/* + * The driver only uses one single LUT entry, that is updated on + * each call of exec_op(). Index 0 is preset at boot with a basic + * read operation, so let's use the last entry (15). + */ +#define SEQID_LUT 15 + +/* Registers used by the driver */ +#define QUADSPI_MCR 0x00 +#define QUADSPI_MCR_RESERVED_MASK GENMASK(19, 16) +#define QUADSPI_MCR_MDIS_MASK BIT(14) +#define QUADSPI_MCR_CLR_TXF_MASK BIT(11) +#define QUADSPI_MCR_CLR_RXF_MASK BIT(10) +#define QUADSPI_MCR_DDR_EN_MASK BIT(7) +#define QUADSPI_MCR_END_CFG_MASK GENMASK(3, 2) +#define QUADSPI_MCR_SWRSTHD_MASK BIT(1) +#define QUADSPI_MCR_SWRSTSD_MASK BIT(0) + +#define QUADSPI_IPCR 0x08 +#define QUADSPI_IPCR_SEQID(x) ((x) << 24) + +#define QUADSPI_FLSHCR 0x0c +#define QUADSPI_FLSHCR_TCSS_MASK GENMASK(3, 0) +#define QUADSPI_FLSHCR_TCSH_MASK GENMASK(11, 8) +#define QUADSPI_FLSHCR_TDH_MASK GENMASK(17, 16) + +#define QUADSPI_BUF0CR 0x10 +#define QUADSPI_BUF1CR 0x14 +#define QUADSPI_BUF2CR 0x18 +#define QUADSPI_BUFXCR_INVALID_MSTRID 0xe + +#define QUADSPI_BUF3CR 0x1c +#define QUADSPI_BUF3CR_ALLMST_MASK BIT(31) +#define QUADSPI_BUF3CR_ADATSZ(x) ((x) << 8) +#define QUADSPI_BUF3CR_ADATSZ_MASK GENMASK(15, 8) + +#define QUADSPI_BFGENCR 0x20 +#define QUADSPI_BFGENCR_SEQID(x) ((x) << 12) + +#define QUADSPI_BUF0IND 0x30 +#define QUADSPI_BUF1IND 0x34 +#define QUADSPI_BUF2IND 0x38 +#define QUADSPI_SFAR 0x100 + +#define QUADSPI_SMPR 0x108 +#define QUADSPI_SMPR_DDRSMP_MASK GENMASK(18, 16) +#define QUADSPI_SMPR_FSDLY_MASK BIT(6) +#define QUADSPI_SMPR_FSPHS_MASK BIT(5) +#define QUADSPI_SMPR_HSENA_MASK BIT(0) + +#define QUADSPI_RBCT 0x110 +#define QUADSPI_RBCT_WMRK_MASK GENMASK(4, 0) +#define QUADSPI_RBCT_RXBRD_USEIPS BIT(8) + +#define QUADSPI_TBDR 0x154 + +#define QUADSPI_SR 0x15c +#define QUADSPI_SR_IP_ACC_MASK BIT(1) +#define QUADSPI_SR_AHB_ACC_MASK BIT(2) + +#define QUADSPI_FR 0x160 +#define QUADSPI_FR_TFF_MASK BIT(0) + +#define QUADSPI_RSER 0x164 +#define QUADSPI_RSER_TFIE BIT(0) + +#define QUADSPI_SPTRCLR 0x16c +#define QUADSPI_SPTRCLR_IPPTRC BIT(8) +#define QUADSPI_SPTRCLR_BFPTRC BIT(0) + +#define QUADSPI_SFA1AD 0x180 +#define QUADSPI_SFA2AD 0x184 +#define QUADSPI_SFB1AD 0x188 +#define QUADSPI_SFB2AD 0x18c +#define QUADSPI_RBDR(x) (0x200 + ((x) * 4)) + +#define QUADSPI_LUTKEY 0x300 +#define QUADSPI_LUTKEY_VALUE 0x5AF05AF0 + +#define QUADSPI_LCKCR 0x304 +#define QUADSPI_LCKER_LOCK BIT(0) +#define QUADSPI_LCKER_UNLOCK BIT(1) + +#define QUADSPI_LUT_BASE 0x310 +#define QUADSPI_LUT_OFFSET (SEQID_LUT * 4 * 4) +#define QUADSPI_LUT_REG(idx) \ + (QUADSPI_LUT_BASE + QUADSPI_LUT_OFFSET + (idx) * 4) + +/* Instruction set for the LUT register */ +#define LUT_STOP 0 +#define LUT_CMD 1 +#define LUT_ADDR 2 +#define LUT_DUMMY 3 +#define LUT_MODE 4 +#define LUT_MODE2 5 +#define LUT_MODE4 6 +#define LUT_FSL_READ 7 +#define LUT_FSL_WRITE 8 +#define LUT_JMP_ON_CS 9 +#define LUT_ADDR_DDR 10 +#define LUT_MODE_DDR 11 +#define LUT_MODE2_DDR 12 +#define LUT_MODE4_DDR 13 +#define LUT_FSL_READ_DDR 14 +#define LUT_FSL_WRITE_DDR 15 +#define LUT_DATA_LEARN 16 + +/* + * The PAD definitions for LUT register. + * + * The pad stands for the number of IO lines [0:3]. + * For example, the quad read needs four IO lines, + * so you should use LUT_PAD(4). + */ +#define LUT_PAD(x) (fls(x) - 1) + +/* + * Macro for constructing the LUT entries with the following + * register layout: + * + * --------------------------------------------------- + * | INSTR1 | PAD1 | OPRND1 | INSTR0 | PAD0 | OPRND0 | + * --------------------------------------------------- + */ +#define LUT_DEF(idx, ins, pad, opr) \ + ((((ins) << 10) | ((pad) << 8) | (opr)) << (((idx) % 2) * 16)) + +/* Controller needs driver to swap endianness */ +#define QUADSPI_QUIRK_SWAP_ENDIAN BIT(0) + +/* Controller needs 4x internal clock */ +#define QUADSPI_QUIRK_4X_INT_CLK BIT(1) + +/* + * TKT253890, the controller needs the driver to fill the txfifo with + * 16 bytes at least to trigger a data transfer, even though the extra + * data won't be transferred. + */ +#define QUADSPI_QUIRK_TKT253890 BIT(2) + +/* TKT245618, the controller cannot wake up from wait mode */ +#define QUADSPI_QUIRK_TKT245618 BIT(3) + +/* + * Controller adds QSPI_AMBA_BASE (base address of the mapped memory) + * internally. No need to add it when setting SFXXAD and SFAR registers + */ +#define QUADSPI_QUIRK_BASE_INTERNAL BIT(4) + +/* + * Controller uses TDH bits in register QUADSPI_FLSHCR. + * They need to be set in accordance with the DDR/SDR mode. + */ +#define QUADSPI_QUIRK_USE_TDH_SETTING BIT(5) + +struct fsl_qspi_devtype_data { + unsigned int rxfifo; + unsigned int txfifo; + int invalid_mstrid; + unsigned int ahb_buf_size; + unsigned int quirks; + bool little_endian; +}; + +static const struct fsl_qspi_devtype_data vybrid_data = { + .rxfifo = SZ_128, + .txfifo = SZ_64, + .invalid_mstrid = QUADSPI_BUFXCR_INVALID_MSTRID, + .ahb_buf_size = SZ_1K, + .quirks = QUADSPI_QUIRK_SWAP_ENDIAN, + .little_endian = true, +}; + +static const struct fsl_qspi_devtype_data imx6sx_data = { + .rxfifo = SZ_128, + .txfifo = SZ_512, + .invalid_mstrid = QUADSPI_BUFXCR_INVALID_MSTRID, + .ahb_buf_size = SZ_1K, + .quirks = QUADSPI_QUIRK_4X_INT_CLK | QUADSPI_QUIRK_TKT245618, + .little_endian = true, +}; + +static const struct fsl_qspi_devtype_data imx7d_data = { + .rxfifo = SZ_128, + .txfifo = SZ_512, + .invalid_mstrid = QUADSPI_BUFXCR_INVALID_MSTRID, + .ahb_buf_size = SZ_1K, + .quirks = QUADSPI_QUIRK_TKT253890 | QUADSPI_QUIRK_4X_INT_CLK | + QUADSPI_QUIRK_USE_TDH_SETTING, + .little_endian = true, +}; + +static const struct fsl_qspi_devtype_data imx6ul_data = { + .rxfifo = SZ_128, + .txfifo = SZ_512, + .invalid_mstrid = QUADSPI_BUFXCR_INVALID_MSTRID, + .ahb_buf_size = SZ_1K, + .quirks = QUADSPI_QUIRK_TKT253890 | QUADSPI_QUIRK_4X_INT_CLK | + QUADSPI_QUIRK_USE_TDH_SETTING, + .little_endian = true, +}; + +static const struct fsl_qspi_devtype_data ls1021a_data = { + .rxfifo = SZ_128, + .txfifo = SZ_64, + .invalid_mstrid = QUADSPI_BUFXCR_INVALID_MSTRID, + .ahb_buf_size = SZ_1K, + .quirks = 0, + .little_endian = false, +}; + +static const struct fsl_qspi_devtype_data ls2080a_data = { + .rxfifo = SZ_128, + .txfifo = SZ_64, + .ahb_buf_size = SZ_1K, + .invalid_mstrid = 0x0, + .quirks = QUADSPI_QUIRK_TKT253890 | QUADSPI_QUIRK_BASE_INTERNAL, + .little_endian = true, +}; + +struct fsl_qspi { + void __iomem *iobase; + void __iomem *ahb_addr; + u32 memmap_phy; + struct clk *clk, *clk_en; + struct device *dev; + struct completion c; + const struct fsl_qspi_devtype_data *devtype_data; + struct mutex lock; + struct pm_qos_request pm_qos_req; + int selected; +}; + +static inline int needs_swap_endian(struct fsl_qspi *q) +{ + return q->devtype_data->quirks & QUADSPI_QUIRK_SWAP_ENDIAN; +} + +static inline int needs_4x_clock(struct fsl_qspi *q) +{ + return q->devtype_data->quirks & QUADSPI_QUIRK_4X_INT_CLK; +} + +static inline int needs_fill_txfifo(struct fsl_qspi *q) +{ + return q->devtype_data->quirks & QUADSPI_QUIRK_TKT253890; +} + +static inline int needs_wakeup_wait_mode(struct fsl_qspi *q) +{ + return q->devtype_data->quirks & QUADSPI_QUIRK_TKT245618; +} + +static inline int needs_amba_base_offset(struct fsl_qspi *q) +{ + return !(q->devtype_data->quirks & QUADSPI_QUIRK_BASE_INTERNAL); +} + +static inline int needs_tdh_setting(struct fsl_qspi *q) +{ + return q->devtype_data->quirks & QUADSPI_QUIRK_USE_TDH_SETTING; +} + +/* + * An IC bug makes it necessary to rearrange the 32-bit data. + * Later chips, such as IMX6SLX, have fixed this bug. + */ +static inline u32 fsl_qspi_endian_xchg(struct fsl_qspi *q, u32 a) +{ + return needs_swap_endian(q) ? __swab32(a) : a; +} + +/* + * R/W functions for big- or little-endian registers: + * The QSPI controller's endianness is independent of + * the CPU core's endianness. So far, although the CPU + * core is little-endian the QSPI controller can use + * big-endian or little-endian. + */ +static void qspi_writel(struct fsl_qspi *q, u32 val, void __iomem *addr) +{ + if (q->devtype_data->little_endian) + iowrite32(val, addr); + else + iowrite32be(val, addr); +} + +static u32 qspi_readl(struct fsl_qspi *q, void __iomem *addr) +{ + if (q->devtype_data->little_endian) + return ioread32(addr); + + return ioread32be(addr); +} + +static irqreturn_t fsl_qspi_irq_handler(int irq, void *dev_id) +{ + struct fsl_qspi *q = dev_id; + u32 reg; + + /* clear interrupt */ + reg = qspi_readl(q, q->iobase + QUADSPI_FR); + qspi_writel(q, reg, q->iobase + QUADSPI_FR); + + if (reg & QUADSPI_FR_TFF_MASK) + complete(&q->c); + + dev_dbg(q->dev, "QUADSPI_FR : 0x%.8x:0x%.8x\n", 0, reg); + return IRQ_HANDLED; +} + +static int fsl_qspi_check_buswidth(struct fsl_qspi *q, u8 width) +{ + switch (width) { + case 1: + case 2: + case 4: + return 0; + } + + return -ENOTSUPP; +} + +static bool fsl_qspi_supports_op(struct spi_mem *mem, + const struct spi_mem_op *op) +{ + struct fsl_qspi *q = spi_controller_get_devdata(mem->spi->master); + int ret; + + ret = fsl_qspi_check_buswidth(q, op->cmd.buswidth); + + if (op->addr.nbytes) + ret |= fsl_qspi_check_buswidth(q, op->addr.buswidth); + + if (op->dummy.nbytes) + ret |= fsl_qspi_check_buswidth(q, op->dummy.buswidth); + + if (op->data.nbytes) + ret |= fsl_qspi_check_buswidth(q, op->data.buswidth); + + if (ret) + return false; + + /* + * The number of instructions needed for the op, needs + * to fit into a single LUT entry. + */ + if (op->addr.nbytes + + (op->dummy.nbytes ? 1:0) + + (op->data.nbytes ? 1:0) > 6) + return false; + + /* Max 64 dummy clock cycles supported */ + if (op->dummy.nbytes && + (op->dummy.nbytes * 8 / op->dummy.buswidth > 64)) + return false; + + /* Max data length, check controller limits and alignment */ + if (op->data.dir == SPI_MEM_DATA_IN && + (op->data.nbytes > q->devtype_data->ahb_buf_size || + (op->data.nbytes > q->devtype_data->rxfifo - 4 && + !IS_ALIGNED(op->data.nbytes, 8)))) + return false; + + if (op->data.dir == SPI_MEM_DATA_OUT && + op->data.nbytes > q->devtype_data->txfifo) + return false; + + return spi_mem_default_supports_op(mem, op); +} + +static void fsl_qspi_prepare_lut(struct fsl_qspi *q, + const struct spi_mem_op *op) +{ + void __iomem *base = q->iobase; + u32 lutval[4] = {}; + int lutidx = 1, i; + + lutval[0] |= LUT_DEF(0, LUT_CMD, LUT_PAD(op->cmd.buswidth), + op->cmd.opcode); + + /* + * For some unknown reason, using LUT_ADDR doesn't work in some + * cases (at least with only one byte long addresses), so + * let's use LUT_MODE to write the address bytes one by one + */ + for (i = 0; i < op->addr.nbytes; i++) { + u8 addrbyte = op->addr.val >> (8 * (op->addr.nbytes - i - 1)); + + lutval[lutidx / 2] |= LUT_DEF(lutidx, LUT_MODE, + LUT_PAD(op->addr.buswidth), + addrbyte); + lutidx++; + } + + if (op->dummy.nbytes) { + lutval[lutidx / 2] |= LUT_DEF(lutidx, LUT_DUMMY, + LUT_PAD(op->dummy.buswidth), + op->dummy.nbytes * 8 / + op->dummy.buswidth); + lutidx++; + } + + if (op->data.nbytes) { + lutval[lutidx / 2] |= LUT_DEF(lutidx, + op->data.dir == SPI_MEM_DATA_IN ? + LUT_FSL_READ : LUT_FSL_WRITE, + LUT_PAD(op->data.buswidth), + 0); + lutidx++; + } + + lutval[lutidx / 2] |= LUT_DEF(lutidx, LUT_STOP, 0, 0); + + /* unlock LUT */ + qspi_writel(q, QUADSPI_LUTKEY_VALUE, q->iobase + QUADSPI_LUTKEY); + qspi_writel(q, QUADSPI_LCKER_UNLOCK, q->iobase + QUADSPI_LCKCR); + + /* fill LUT */ + for (i = 0; i < ARRAY_SIZE(lutval); i++) + qspi_writel(q, lutval[i], base + QUADSPI_LUT_REG(i)); + + /* lock LUT */ + qspi_writel(q, QUADSPI_LUTKEY_VALUE, q->iobase + QUADSPI_LUTKEY); + qspi_writel(q, QUADSPI_LCKER_LOCK, q->iobase + QUADSPI_LCKCR); +} + +static int fsl_qspi_clk_prep_enable(struct fsl_qspi *q) +{ + int ret; + + ret = clk_prepare_enable(q->clk_en); + if (ret) + return ret; + + ret = clk_prepare_enable(q->clk); + if (ret) { + clk_disable_unprepare(q->clk_en); + return ret; + } + + if (needs_wakeup_wait_mode(q)) + cpu_latency_qos_add_request(&q->pm_qos_req, 0); + + return 0; +} + +static void fsl_qspi_clk_disable_unprep(struct fsl_qspi *q) +{ + if (needs_wakeup_wait_mode(q)) + cpu_latency_qos_remove_request(&q->pm_qos_req); + + clk_disable_unprepare(q->clk); + clk_disable_unprepare(q->clk_en); +} + +/* + * If we have changed the content of the flash by writing or erasing, or if we + * read from flash with a different offset into the page buffer, we need to + * invalidate the AHB buffer. If we do not do so, we may read out the wrong + * data. The spec tells us reset the AHB domain and Serial Flash domain at + * the same time. + */ +static void fsl_qspi_invalidate(struct fsl_qspi *q) +{ + u32 reg; + + reg = qspi_readl(q, q->iobase + QUADSPI_MCR); + reg |= QUADSPI_MCR_SWRSTHD_MASK | QUADSPI_MCR_SWRSTSD_MASK; + qspi_writel(q, reg, q->iobase + QUADSPI_MCR); + + /* + * The minimum delay : 1 AHB + 2 SFCK clocks. + * Delay 1 us is enough. + */ + udelay(1); + + reg &= ~(QUADSPI_MCR_SWRSTHD_MASK | QUADSPI_MCR_SWRSTSD_MASK); + qspi_writel(q, reg, q->iobase + QUADSPI_MCR); +} + +static void fsl_qspi_select_mem(struct fsl_qspi *q, struct spi_device *spi) +{ + unsigned long rate = spi->max_speed_hz; + int ret; + + if (q->selected == spi->chip_select) + return; + + if (needs_4x_clock(q)) + rate *= 4; + + fsl_qspi_clk_disable_unprep(q); + + ret = clk_set_rate(q->clk, rate); + if (ret) + return; + + ret = fsl_qspi_clk_prep_enable(q); + if (ret) + return; + + q->selected = spi->chip_select; + + fsl_qspi_invalidate(q); +} + +static void fsl_qspi_read_ahb(struct fsl_qspi *q, const struct spi_mem_op *op) +{ + memcpy_fromio(op->data.buf.in, + q->ahb_addr + q->selected * q->devtype_data->ahb_buf_size, + op->data.nbytes); +} + +static void fsl_qspi_fill_txfifo(struct fsl_qspi *q, + const struct spi_mem_op *op) +{ + void __iomem *base = q->iobase; + int i; + u32 val; + + for (i = 0; i < ALIGN_DOWN(op->data.nbytes, 4); i += 4) { + memcpy(&val, op->data.buf.out + i, 4); + val = fsl_qspi_endian_xchg(q, val); + qspi_writel(q, val, base + QUADSPI_TBDR); + } + + if (i < op->data.nbytes) { + memcpy(&val, op->data.buf.out + i, op->data.nbytes - i); + val = fsl_qspi_endian_xchg(q, val); + qspi_writel(q, val, base + QUADSPI_TBDR); + } + + if (needs_fill_txfifo(q)) { + for (i = op->data.nbytes; i < 16; i += 4) + qspi_writel(q, 0, base + QUADSPI_TBDR); + } +} + +static void fsl_qspi_read_rxfifo(struct fsl_qspi *q, + const struct spi_mem_op *op) +{ + void __iomem *base = q->iobase; + int i; + u8 *buf = op->data.buf.in; + u32 val; + + for (i = 0; i < ALIGN_DOWN(op->data.nbytes, 4); i += 4) { + val = qspi_readl(q, base + QUADSPI_RBDR(i / 4)); + val = fsl_qspi_endian_xchg(q, val); + memcpy(buf + i, &val, 4); + } + + if (i < op->data.nbytes) { + val = qspi_readl(q, base + QUADSPI_RBDR(i / 4)); + val = fsl_qspi_endian_xchg(q, val); + memcpy(buf + i, &val, op->data.nbytes - i); + } +} + +static int fsl_qspi_do_op(struct fsl_qspi *q, const struct spi_mem_op *op) +{ + void __iomem *base = q->iobase; + int err = 0; + + init_completion(&q->c); + + /* + * Always start the sequence at the same index since we update + * the LUT at each exec_op() call. And also specify the DATA + * length, since it's has not been specified in the LUT. + */ + qspi_writel(q, op->data.nbytes | QUADSPI_IPCR_SEQID(SEQID_LUT), + base + QUADSPI_IPCR); + + /* Wait for the interrupt. */ + if (!wait_for_completion_timeout(&q->c, msecs_to_jiffies(1000))) + err = -ETIMEDOUT; + + if (!err && op->data.nbytes && op->data.dir == SPI_MEM_DATA_IN) + fsl_qspi_read_rxfifo(q, op); + + return err; +} + +static int fsl_qspi_readl_poll_tout(struct fsl_qspi *q, void __iomem *base, + u32 mask, u32 delay_us, u32 timeout_us) +{ + u32 reg; + + if (!q->devtype_data->little_endian) + mask = (u32)cpu_to_be32(mask); + + return readl_poll_timeout(base, reg, !(reg & mask), delay_us, + timeout_us); +} + +static int fsl_qspi_exec_op(struct spi_mem *mem, const struct spi_mem_op *op) +{ + struct fsl_qspi *q = spi_controller_get_devdata(mem->spi->master); + void __iomem *base = q->iobase; + u32 addr_offset = 0; + int err = 0; + int invalid_mstrid = q->devtype_data->invalid_mstrid; + + mutex_lock(&q->lock); + + /* wait for the controller being ready */ + fsl_qspi_readl_poll_tout(q, base + QUADSPI_SR, (QUADSPI_SR_IP_ACC_MASK | + QUADSPI_SR_AHB_ACC_MASK), 10, 1000); + + fsl_qspi_select_mem(q, mem->spi); + + if (needs_amba_base_offset(q)) + addr_offset = q->memmap_phy; + + qspi_writel(q, + q->selected * q->devtype_data->ahb_buf_size + addr_offset, + base + QUADSPI_SFAR); + + qspi_writel(q, qspi_readl(q, base + QUADSPI_MCR) | + QUADSPI_MCR_CLR_RXF_MASK | QUADSPI_MCR_CLR_TXF_MASK, + base + QUADSPI_MCR); + + qspi_writel(q, QUADSPI_SPTRCLR_BFPTRC | QUADSPI_SPTRCLR_IPPTRC, + base + QUADSPI_SPTRCLR); + + qspi_writel(q, invalid_mstrid, base + QUADSPI_BUF0CR); + qspi_writel(q, invalid_mstrid, base + QUADSPI_BUF1CR); + qspi_writel(q, invalid_mstrid, base + QUADSPI_BUF2CR); + + fsl_qspi_prepare_lut(q, op); + + /* + * If we have large chunks of data, we read them through the AHB bus + * by accessing the mapped memory. In all other cases we use + * IP commands to access the flash. + */ + if (op->data.nbytes > (q->devtype_data->rxfifo - 4) && + op->data.dir == SPI_MEM_DATA_IN) { + fsl_qspi_read_ahb(q, op); + } else { + qspi_writel(q, QUADSPI_RBCT_WMRK_MASK | + QUADSPI_RBCT_RXBRD_USEIPS, base + QUADSPI_RBCT); + + if (op->data.nbytes && op->data.dir == SPI_MEM_DATA_OUT) + fsl_qspi_fill_txfifo(q, op); + + err = fsl_qspi_do_op(q, op); + } + + /* Invalidate the data in the AHB buffer. */ + fsl_qspi_invalidate(q); + + mutex_unlock(&q->lock); + + return err; +} + +static int fsl_qspi_adjust_op_size(struct spi_mem *mem, struct spi_mem_op *op) +{ + struct fsl_qspi *q = spi_controller_get_devdata(mem->spi->master); + + if (op->data.dir == SPI_MEM_DATA_OUT) { + if (op->data.nbytes > q->devtype_data->txfifo) + op->data.nbytes = q->devtype_data->txfifo; + } else { + if (op->data.nbytes > q->devtype_data->ahb_buf_size) + op->data.nbytes = q->devtype_data->ahb_buf_size; + else if (op->data.nbytes > (q->devtype_data->rxfifo - 4)) + op->data.nbytes = ALIGN_DOWN(op->data.nbytes, 8); + } + + return 0; +} + +static int fsl_qspi_default_setup(struct fsl_qspi *q) +{ + void __iomem *base = q->iobase; + u32 reg, addr_offset = 0; + int ret; + + /* disable and unprepare clock to avoid glitch pass to controller */ + fsl_qspi_clk_disable_unprep(q); + + /* the default frequency, we will change it later if necessary. */ + ret = clk_set_rate(q->clk, 66000000); + if (ret) + return ret; + + ret = fsl_qspi_clk_prep_enable(q); + if (ret) + return ret; + + /* Reset the module */ + qspi_writel(q, QUADSPI_MCR_SWRSTSD_MASK | QUADSPI_MCR_SWRSTHD_MASK, + base + QUADSPI_MCR); + udelay(1); + + /* Disable the module */ + qspi_writel(q, QUADSPI_MCR_MDIS_MASK | QUADSPI_MCR_RESERVED_MASK, + base + QUADSPI_MCR); + + /* + * Previous boot stages (BootROM, bootloader) might have used DDR + * mode and did not clear the TDH bits. As we currently use SDR mode + * only, clear the TDH bits if necessary. + */ + if (needs_tdh_setting(q)) + qspi_writel(q, qspi_readl(q, base + QUADSPI_FLSHCR) & + ~QUADSPI_FLSHCR_TDH_MASK, + base + QUADSPI_FLSHCR); + + reg = qspi_readl(q, base + QUADSPI_SMPR); + qspi_writel(q, reg & ~(QUADSPI_SMPR_FSDLY_MASK + | QUADSPI_SMPR_FSPHS_MASK + | QUADSPI_SMPR_HSENA_MASK + | QUADSPI_SMPR_DDRSMP_MASK), base + QUADSPI_SMPR); + + /* We only use the buffer3 for AHB read */ + qspi_writel(q, 0, base + QUADSPI_BUF0IND); + qspi_writel(q, 0, base + QUADSPI_BUF1IND); + qspi_writel(q, 0, base + QUADSPI_BUF2IND); + + qspi_writel(q, QUADSPI_BFGENCR_SEQID(SEQID_LUT), + q->iobase + QUADSPI_BFGENCR); + qspi_writel(q, QUADSPI_RBCT_WMRK_MASK, base + QUADSPI_RBCT); + qspi_writel(q, QUADSPI_BUF3CR_ALLMST_MASK | + QUADSPI_BUF3CR_ADATSZ(q->devtype_data->ahb_buf_size / 8), + base + QUADSPI_BUF3CR); + + if (needs_amba_base_offset(q)) + addr_offset = q->memmap_phy; + + /* + * In HW there can be a maximum of four chips on two buses with + * two chip selects on each bus. We use four chip selects in SW + * to differentiate between the four chips. + * We use ahb_buf_size for each chip and set SFA1AD, SFA2AD, SFB1AD, + * SFB2AD accordingly. + */ + qspi_writel(q, q->devtype_data->ahb_buf_size + addr_offset, + base + QUADSPI_SFA1AD); + qspi_writel(q, q->devtype_data->ahb_buf_size * 2 + addr_offset, + base + QUADSPI_SFA2AD); + qspi_writel(q, q->devtype_data->ahb_buf_size * 3 + addr_offset, + base + QUADSPI_SFB1AD); + qspi_writel(q, q->devtype_data->ahb_buf_size * 4 + addr_offset, + base + QUADSPI_SFB2AD); + + q->selected = -1; + + /* Enable the module */ + qspi_writel(q, QUADSPI_MCR_RESERVED_MASK | QUADSPI_MCR_END_CFG_MASK, + base + QUADSPI_MCR); + + /* clear all interrupt status */ + qspi_writel(q, 0xffffffff, q->iobase + QUADSPI_FR); + + /* enable the interrupt */ + qspi_writel(q, QUADSPI_RSER_TFIE, q->iobase + QUADSPI_RSER); + + return 0; +} + +static const char *fsl_qspi_get_name(struct spi_mem *mem) +{ + struct fsl_qspi *q = spi_controller_get_devdata(mem->spi->master); + struct device *dev = &mem->spi->dev; + const char *name; + + /* + * In order to keep mtdparts compatible with the old MTD driver at + * mtd/spi-nor/fsl-quadspi.c, we set a custom name derived from the + * platform_device of the controller. + */ + if (of_get_available_child_count(q->dev->of_node) == 1) + return dev_name(q->dev); + + name = devm_kasprintf(dev, GFP_KERNEL, + "%s-%d", dev_name(q->dev), + mem->spi->chip_select); + + if (!name) { + dev_err(dev, "failed to get memory for custom flash name\n"); + return ERR_PTR(-ENOMEM); + } + + return name; +} + +static const struct spi_controller_mem_ops fsl_qspi_mem_ops = { + .adjust_op_size = fsl_qspi_adjust_op_size, + .supports_op = fsl_qspi_supports_op, + .exec_op = fsl_qspi_exec_op, + .get_name = fsl_qspi_get_name, +}; + +static int fsl_qspi_probe(struct platform_device *pdev) +{ + struct spi_controller *ctlr; + struct device *dev = &pdev->dev; + struct device_node *np = dev->of_node; + struct resource *res; + struct fsl_qspi *q; + int ret; + + ctlr = spi_alloc_master(&pdev->dev, sizeof(*q)); + if (!ctlr) + return -ENOMEM; + + ctlr->mode_bits = SPI_RX_DUAL | SPI_RX_QUAD | + SPI_TX_DUAL | SPI_TX_QUAD; + + q = spi_controller_get_devdata(ctlr); + q->dev = dev; + q->devtype_data = of_device_get_match_data(dev); + if (!q->devtype_data) { + ret = -ENODEV; + goto err_put_ctrl; + } + + platform_set_drvdata(pdev, q); + + /* find the resources */ + res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "QuadSPI"); + q->iobase = devm_ioremap_resource(dev, res); + if (IS_ERR(q->iobase)) { + ret = PTR_ERR(q->iobase); + goto err_put_ctrl; + } + + res = platform_get_resource_byname(pdev, IORESOURCE_MEM, + "QuadSPI-memory"); + if (!res) { + ret = -EINVAL; + goto err_put_ctrl; + } + q->memmap_phy = res->start; + /* Since there are 4 cs, map size required is 4 times ahb_buf_size */ + q->ahb_addr = devm_ioremap(dev, q->memmap_phy, + (q->devtype_data->ahb_buf_size * 4)); + if (!q->ahb_addr) { + ret = -ENOMEM; + goto err_put_ctrl; + } + + /* find the clocks */ + q->clk_en = devm_clk_get(dev, "qspi_en"); + if (IS_ERR(q->clk_en)) { + ret = PTR_ERR(q->clk_en); + goto err_put_ctrl; + } + + q->clk = devm_clk_get(dev, "qspi"); + if (IS_ERR(q->clk)) { + ret = PTR_ERR(q->clk); + goto err_put_ctrl; + } + + ret = fsl_qspi_clk_prep_enable(q); + if (ret) { + dev_err(dev, "can not enable the clock\n"); + goto err_put_ctrl; + } + + /* find the irq */ + ret = platform_get_irq(pdev, 0); + if (ret < 0) + goto err_disable_clk; + + ret = devm_request_irq(dev, ret, + fsl_qspi_irq_handler, 0, pdev->name, q); + if (ret) { + dev_err(dev, "failed to request irq: %d\n", ret); + goto err_disable_clk; + } + + mutex_init(&q->lock); + + ctlr->bus_num = -1; + ctlr->num_chipselect = 4; + ctlr->mem_ops = &fsl_qspi_mem_ops; + + fsl_qspi_default_setup(q); + + ctlr->dev.of_node = np; + + ret = devm_spi_register_controller(dev, ctlr); + if (ret) + goto err_destroy_mutex; + + return 0; + +err_destroy_mutex: + mutex_destroy(&q->lock); + +err_disable_clk: + fsl_qspi_clk_disable_unprep(q); + +err_put_ctrl: + spi_controller_put(ctlr); + + dev_err(dev, "Freescale QuadSPI probe failed\n"); + return ret; +} + +static int fsl_qspi_remove(struct platform_device *pdev) +{ + struct fsl_qspi *q = platform_get_drvdata(pdev); + + /* disable the hardware */ + qspi_writel(q, QUADSPI_MCR_MDIS_MASK, q->iobase + QUADSPI_MCR); + qspi_writel(q, 0x0, q->iobase + QUADSPI_RSER); + + fsl_qspi_clk_disable_unprep(q); + + mutex_destroy(&q->lock); + + return 0; +} + +static int fsl_qspi_suspend(struct device *dev) +{ + return 0; +} + +static int fsl_qspi_resume(struct device *dev) +{ + struct fsl_qspi *q = dev_get_drvdata(dev); + + fsl_qspi_default_setup(q); + + return 0; +} + +static const struct of_device_id fsl_qspi_dt_ids[] = { + { .compatible = "fsl,vf610-qspi", .data = &vybrid_data, }, + { .compatible = "fsl,imx6sx-qspi", .data = &imx6sx_data, }, + { .compatible = "fsl,imx7d-qspi", .data = &imx7d_data, }, + { .compatible = "fsl,imx6ul-qspi", .data = &imx6ul_data, }, + { .compatible = "fsl,ls1021a-qspi", .data = &ls1021a_data, }, + { .compatible = "fsl,ls2080a-qspi", .data = &ls2080a_data, }, + { /* sentinel */ } +}; +MODULE_DEVICE_TABLE(of, fsl_qspi_dt_ids); + +static const struct dev_pm_ops fsl_qspi_pm_ops = { + .suspend = fsl_qspi_suspend, + .resume = fsl_qspi_resume, +}; + +static struct platform_driver fsl_qspi_driver = { + .driver = { + .name = "fsl-quadspi", + .of_match_table = fsl_qspi_dt_ids, + .pm = &fsl_qspi_pm_ops, + }, + .probe = fsl_qspi_probe, + .remove = fsl_qspi_remove, +}; +module_platform_driver(fsl_qspi_driver); + +MODULE_DESCRIPTION("Freescale QuadSPI Controller Driver"); +MODULE_AUTHOR("Freescale Semiconductor Inc."); +MODULE_AUTHOR("Boris Brezillon <bbrezillon@kernel.org>"); +MODULE_AUTHOR("Frieder Schrempf <frieder.schrempf@kontron.de>"); +MODULE_AUTHOR("Yogesh Gaur <yogeshnarayan.gaur@nxp.com>"); +MODULE_AUTHOR("Suresh Gupta <suresh.gupta@nxp.com>"); +MODULE_LICENSE("GPL v2"); diff --git a/drivers/spi/spi-fsl-spi.c b/drivers/spi/spi-fsl-spi.c new file mode 100644 index 000000000..63302e21e --- /dev/null +++ b/drivers/spi/spi-fsl-spi.c @@ -0,0 +1,878 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Freescale SPI controller driver. + * + * Maintainer: Kumar Gala + * + * Copyright (C) 2006 Polycom, Inc. + * Copyright 2010 Freescale Semiconductor, Inc. + * + * CPM SPI and QE buffer descriptors mode support: + * Copyright (c) 2009 MontaVista Software, Inc. + * Author: Anton Vorontsov <avorontsov@ru.mvista.com> + * + * GRLIB support: + * Copyright (c) 2012 Aeroflex Gaisler AB. + * Author: Andreas Larsson <andreas@gaisler.com> + */ +#include <linux/delay.h> +#include <linux/dma-mapping.h> +#include <linux/fsl_devices.h> +#include <linux/gpio/consumer.h> +#include <linux/interrupt.h> +#include <linux/irq.h> +#include <linux/kernel.h> +#include <linux/mm.h> +#include <linux/module.h> +#include <linux/mutex.h> +#include <linux/of.h> +#include <linux/of_address.h> +#include <linux/of_irq.h> +#include <linux/of_platform.h> +#include <linux/platform_device.h> +#include <linux/spi/spi.h> +#include <linux/spi/spi_bitbang.h> +#include <linux/types.h> + +#ifdef CONFIG_FSL_SOC +#include <sysdev/fsl_soc.h> +#endif + +/* Specific to the MPC8306/MPC8309 */ +#define IMMR_SPI_CS_OFFSET 0x14c +#define SPI_BOOT_SEL_BIT 0x80000000 + +#include "spi-fsl-lib.h" +#include "spi-fsl-cpm.h" +#include "spi-fsl-spi.h" + +#define TYPE_FSL 0 +#define TYPE_GRLIB 1 + +struct fsl_spi_match_data { + int type; +}; + +static struct fsl_spi_match_data of_fsl_spi_fsl_config = { + .type = TYPE_FSL, +}; + +static struct fsl_spi_match_data of_fsl_spi_grlib_config = { + .type = TYPE_GRLIB, +}; + +static const struct of_device_id of_fsl_spi_match[] = { + { + .compatible = "fsl,spi", + .data = &of_fsl_spi_fsl_config, + }, + { + .compatible = "aeroflexgaisler,spictrl", + .data = &of_fsl_spi_grlib_config, + }, + {} +}; +MODULE_DEVICE_TABLE(of, of_fsl_spi_match); + +static int fsl_spi_get_type(struct device *dev) +{ + const struct of_device_id *match; + + if (dev->of_node) { + match = of_match_node(of_fsl_spi_match, dev->of_node); + if (match && match->data) + return ((struct fsl_spi_match_data *)match->data)->type; + } + return TYPE_FSL; +} + +static void fsl_spi_change_mode(struct spi_device *spi) +{ + struct mpc8xxx_spi *mspi = spi_master_get_devdata(spi->master); + struct spi_mpc8xxx_cs *cs = spi->controller_state; + struct fsl_spi_reg __iomem *reg_base = mspi->reg_base; + __be32 __iomem *mode = ®_base->mode; + unsigned long flags; + + if (cs->hw_mode == mpc8xxx_spi_read_reg(mode)) + return; + + /* Turn off IRQs locally to minimize time that SPI is disabled. */ + local_irq_save(flags); + + /* Turn off SPI unit prior changing mode */ + mpc8xxx_spi_write_reg(mode, cs->hw_mode & ~SPMODE_ENABLE); + + /* When in CPM mode, we need to reinit tx and rx. */ + if (mspi->flags & SPI_CPM_MODE) { + fsl_spi_cpm_reinit_txrx(mspi); + } + mpc8xxx_spi_write_reg(mode, cs->hw_mode); + local_irq_restore(flags); +} + +static void fsl_spi_chipselect(struct spi_device *spi, int value) +{ + struct mpc8xxx_spi *mpc8xxx_spi = spi_master_get_devdata(spi->master); + struct fsl_spi_platform_data *pdata; + struct spi_mpc8xxx_cs *cs = spi->controller_state; + + pdata = spi->dev.parent->parent->platform_data; + + if (value == BITBANG_CS_INACTIVE) { + if (pdata->cs_control) + pdata->cs_control(spi, false); + } + + if (value == BITBANG_CS_ACTIVE) { + mpc8xxx_spi->rx_shift = cs->rx_shift; + mpc8xxx_spi->tx_shift = cs->tx_shift; + mpc8xxx_spi->get_rx = cs->get_rx; + mpc8xxx_spi->get_tx = cs->get_tx; + + fsl_spi_change_mode(spi); + + if (pdata->cs_control) + pdata->cs_control(spi, true); + } +} + +static void fsl_spi_qe_cpu_set_shifts(u32 *rx_shift, u32 *tx_shift, + int bits_per_word, int msb_first) +{ + *rx_shift = 0; + *tx_shift = 0; + if (msb_first) { + if (bits_per_word <= 8) { + *rx_shift = 16; + *tx_shift = 24; + } else if (bits_per_word <= 16) { + *rx_shift = 16; + *tx_shift = 16; + } + } else { + if (bits_per_word <= 8) + *rx_shift = 8; + } +} + +static void fsl_spi_grlib_set_shifts(u32 *rx_shift, u32 *tx_shift, + int bits_per_word, int msb_first) +{ + *rx_shift = 0; + *tx_shift = 0; + if (bits_per_word <= 16) { + if (msb_first) { + *rx_shift = 16; /* LSB in bit 16 */ + *tx_shift = 32 - bits_per_word; /* MSB in bit 31 */ + } else { + *rx_shift = 16 - bits_per_word; /* MSB in bit 15 */ + } + } +} + +static int mspi_apply_cpu_mode_quirks(struct spi_mpc8xxx_cs *cs, + struct spi_device *spi, + struct mpc8xxx_spi *mpc8xxx_spi, + int bits_per_word) +{ + cs->rx_shift = 0; + cs->tx_shift = 0; + if (bits_per_word <= 8) { + cs->get_rx = mpc8xxx_spi_rx_buf_u8; + cs->get_tx = mpc8xxx_spi_tx_buf_u8; + } else if (bits_per_word <= 16) { + cs->get_rx = mpc8xxx_spi_rx_buf_u16; + cs->get_tx = mpc8xxx_spi_tx_buf_u16; + } else if (bits_per_word <= 32) { + cs->get_rx = mpc8xxx_spi_rx_buf_u32; + cs->get_tx = mpc8xxx_spi_tx_buf_u32; + } else + return -EINVAL; + + if (mpc8xxx_spi->set_shifts) + mpc8xxx_spi->set_shifts(&cs->rx_shift, &cs->tx_shift, + bits_per_word, + !(spi->mode & SPI_LSB_FIRST)); + + mpc8xxx_spi->rx_shift = cs->rx_shift; + mpc8xxx_spi->tx_shift = cs->tx_shift; + mpc8xxx_spi->get_rx = cs->get_rx; + mpc8xxx_spi->get_tx = cs->get_tx; + + return bits_per_word; +} + +static int fsl_spi_setup_transfer(struct spi_device *spi, + struct spi_transfer *t) +{ + struct mpc8xxx_spi *mpc8xxx_spi; + int bits_per_word = 0; + u8 pm; + u32 hz = 0; + struct spi_mpc8xxx_cs *cs = spi->controller_state; + + mpc8xxx_spi = spi_master_get_devdata(spi->master); + + if (t) { + bits_per_word = t->bits_per_word; + hz = t->speed_hz; + } + + /* spi_transfer level calls that work per-word */ + if (!bits_per_word) + bits_per_word = spi->bits_per_word; + + if (!hz) + hz = spi->max_speed_hz; + + if (!(mpc8xxx_spi->flags & SPI_CPM_MODE)) + bits_per_word = mspi_apply_cpu_mode_quirks(cs, spi, + mpc8xxx_spi, + bits_per_word); + + if (bits_per_word < 0) + return bits_per_word; + + if (bits_per_word == 32) + bits_per_word = 0; + else + bits_per_word = bits_per_word - 1; + + /* mask out bits we are going to set */ + cs->hw_mode &= ~(SPMODE_LEN(0xF) | SPMODE_DIV16 + | SPMODE_PM(0xF)); + + cs->hw_mode |= SPMODE_LEN(bits_per_word); + + if ((mpc8xxx_spi->spibrg / hz) > 64) { + cs->hw_mode |= SPMODE_DIV16; + pm = (mpc8xxx_spi->spibrg - 1) / (hz * 64) + 1; + WARN_ONCE(pm > 16, + "%s: Requested speed is too low: %d Hz. Will use %d Hz instead.\n", + dev_name(&spi->dev), hz, mpc8xxx_spi->spibrg / 1024); + if (pm > 16) + pm = 16; + } else { + pm = (mpc8xxx_spi->spibrg - 1) / (hz * 4) + 1; + } + if (pm) + pm--; + + cs->hw_mode |= SPMODE_PM(pm); + + fsl_spi_change_mode(spi); + return 0; +} + +static int fsl_spi_cpu_bufs(struct mpc8xxx_spi *mspi, + struct spi_transfer *t, unsigned int len) +{ + u32 word; + struct fsl_spi_reg __iomem *reg_base = mspi->reg_base; + + mspi->count = len; + + /* enable rx ints */ + mpc8xxx_spi_write_reg(®_base->mask, SPIM_NE); + + /* transmit word */ + word = mspi->get_tx(mspi); + mpc8xxx_spi_write_reg(®_base->transmit, word); + + return 0; +} + +static int fsl_spi_bufs(struct spi_device *spi, struct spi_transfer *t, + bool is_dma_mapped) +{ + struct mpc8xxx_spi *mpc8xxx_spi = spi_master_get_devdata(spi->master); + struct fsl_spi_reg __iomem *reg_base; + unsigned int len = t->len; + u8 bits_per_word; + int ret; + + reg_base = mpc8xxx_spi->reg_base; + bits_per_word = spi->bits_per_word; + if (t->bits_per_word) + bits_per_word = t->bits_per_word; + + if (bits_per_word > 8) { + /* invalid length? */ + if (len & 1) + return -EINVAL; + len /= 2; + } + if (bits_per_word > 16) { + /* invalid length? */ + if (len & 1) + return -EINVAL; + len /= 2; + } + + mpc8xxx_spi->tx = t->tx_buf; + mpc8xxx_spi->rx = t->rx_buf; + + reinit_completion(&mpc8xxx_spi->done); + + if (mpc8xxx_spi->flags & SPI_CPM_MODE) + ret = fsl_spi_cpm_bufs(mpc8xxx_spi, t, is_dma_mapped); + else + ret = fsl_spi_cpu_bufs(mpc8xxx_spi, t, len); + if (ret) + return ret; + + wait_for_completion(&mpc8xxx_spi->done); + + /* disable rx ints */ + mpc8xxx_spi_write_reg(®_base->mask, 0); + + if (mpc8xxx_spi->flags & SPI_CPM_MODE) + fsl_spi_cpm_bufs_complete(mpc8xxx_spi); + + return mpc8xxx_spi->count; +} + +static int fsl_spi_do_one_msg(struct spi_master *master, + struct spi_message *m) +{ + struct mpc8xxx_spi *mpc8xxx_spi = spi_master_get_devdata(master); + struct spi_device *spi = m->spi; + struct spi_transfer *t, *first; + unsigned int cs_change; + const int nsecs = 50; + int status, last_bpw; + + /* + * In CPU mode, optimize large byte transfers to use larger + * bits_per_word values to reduce number of interrupts taken. + */ + list_for_each_entry(t, &m->transfers, transfer_list) { + if (!(mpc8xxx_spi->flags & SPI_CPM_MODE)) { + if (t->len < 256 || t->bits_per_word != 8) + continue; + if ((t->len & 3) == 0) + t->bits_per_word = 32; + else if ((t->len & 1) == 0) + t->bits_per_word = 16; + } else { + /* + * CPM/QE uses Little Endian for words > 8 + * so transform 16 and 32 bits words into 8 bits + * Unfortnatly that doesn't work for LSB so + * reject these for now + * Note: 32 bits word, LSB works iff + * tfcr/rfcr is set to CPMFCR_GBL + */ + if (m->spi->mode & SPI_LSB_FIRST && t->bits_per_word > 8) + return -EINVAL; + if (t->bits_per_word == 16 || t->bits_per_word == 32) + t->bits_per_word = 8; /* pretend its 8 bits */ + if (t->bits_per_word == 8 && t->len >= 256 && + (mpc8xxx_spi->flags & SPI_CPM1)) + t->bits_per_word = 16; + } + } + + /* Don't allow changes if CS is active */ + cs_change = 1; + list_for_each_entry(t, &m->transfers, transfer_list) { + if (cs_change) + first = t; + cs_change = t->cs_change; + if (first->speed_hz != t->speed_hz) { + dev_err(&spi->dev, + "speed_hz cannot change while CS is active\n"); + return -EINVAL; + } + } + + last_bpw = -1; + cs_change = 1; + status = -EINVAL; + list_for_each_entry(t, &m->transfers, transfer_list) { + if (cs_change || last_bpw != t->bits_per_word) + status = fsl_spi_setup_transfer(spi, t); + if (status < 0) + break; + last_bpw = t->bits_per_word; + + if (cs_change) { + fsl_spi_chipselect(spi, BITBANG_CS_ACTIVE); + ndelay(nsecs); + } + cs_change = t->cs_change; + if (t->len) + status = fsl_spi_bufs(spi, t, m->is_dma_mapped); + if (status) { + status = -EMSGSIZE; + break; + } + m->actual_length += t->len; + + spi_transfer_delay_exec(t); + + if (cs_change) { + ndelay(nsecs); + fsl_spi_chipselect(spi, BITBANG_CS_INACTIVE); + ndelay(nsecs); + } + } + + m->status = status; + + if (status || !cs_change) { + ndelay(nsecs); + fsl_spi_chipselect(spi, BITBANG_CS_INACTIVE); + } + + fsl_spi_setup_transfer(spi, NULL); + spi_finalize_current_message(master); + return 0; +} + +static int fsl_spi_setup(struct spi_device *spi) +{ + struct mpc8xxx_spi *mpc8xxx_spi; + struct fsl_spi_reg __iomem *reg_base; + bool initial_setup = false; + int retval; + u32 hw_mode; + struct spi_mpc8xxx_cs *cs = spi_get_ctldata(spi); + + if (!spi->max_speed_hz) + return -EINVAL; + + if (!cs) { + cs = kzalloc(sizeof(*cs), GFP_KERNEL); + if (!cs) + return -ENOMEM; + spi_set_ctldata(spi, cs); + initial_setup = true; + } + mpc8xxx_spi = spi_master_get_devdata(spi->master); + + reg_base = mpc8xxx_spi->reg_base; + + hw_mode = cs->hw_mode; /* Save original settings */ + cs->hw_mode = mpc8xxx_spi_read_reg(®_base->mode); + /* mask out bits we are going to set */ + cs->hw_mode &= ~(SPMODE_CP_BEGIN_EDGECLK | SPMODE_CI_INACTIVEHIGH + | SPMODE_REV | SPMODE_LOOP); + + if (spi->mode & SPI_CPHA) + cs->hw_mode |= SPMODE_CP_BEGIN_EDGECLK; + if (spi->mode & SPI_CPOL) + cs->hw_mode |= SPMODE_CI_INACTIVEHIGH; + if (!(spi->mode & SPI_LSB_FIRST)) + cs->hw_mode |= SPMODE_REV; + if (spi->mode & SPI_LOOP) + cs->hw_mode |= SPMODE_LOOP; + + retval = fsl_spi_setup_transfer(spi, NULL); + if (retval < 0) { + cs->hw_mode = hw_mode; /* Restore settings */ + if (initial_setup) + kfree(cs); + return retval; + } + + /* Initialize chipselect - might be active for SPI_CS_HIGH mode */ + fsl_spi_chipselect(spi, BITBANG_CS_INACTIVE); + + return 0; +} + +static void fsl_spi_cleanup(struct spi_device *spi) +{ + struct spi_mpc8xxx_cs *cs = spi_get_ctldata(spi); + + kfree(cs); + spi_set_ctldata(spi, NULL); +} + +static void fsl_spi_cpu_irq(struct mpc8xxx_spi *mspi, u32 events) +{ + struct fsl_spi_reg __iomem *reg_base = mspi->reg_base; + + /* We need handle RX first */ + if (events & SPIE_NE) { + u32 rx_data = mpc8xxx_spi_read_reg(®_base->receive); + + if (mspi->rx) + mspi->get_rx(rx_data, mspi); + } + + if ((events & SPIE_NF) == 0) + /* spin until TX is done */ + while (((events = + mpc8xxx_spi_read_reg(®_base->event)) & + SPIE_NF) == 0) + cpu_relax(); + + /* Clear the events */ + mpc8xxx_spi_write_reg(®_base->event, events); + + mspi->count -= 1; + if (mspi->count) { + u32 word = mspi->get_tx(mspi); + + mpc8xxx_spi_write_reg(®_base->transmit, word); + } else { + complete(&mspi->done); + } +} + +static irqreturn_t fsl_spi_irq(s32 irq, void *context_data) +{ + struct mpc8xxx_spi *mspi = context_data; + irqreturn_t ret = IRQ_NONE; + u32 events; + struct fsl_spi_reg __iomem *reg_base = mspi->reg_base; + + /* Get interrupt events(tx/rx) */ + events = mpc8xxx_spi_read_reg(®_base->event); + if (events) + ret = IRQ_HANDLED; + + dev_dbg(mspi->dev, "%s: events %x\n", __func__, events); + + if (mspi->flags & SPI_CPM_MODE) + fsl_spi_cpm_irq(mspi, events); + else + fsl_spi_cpu_irq(mspi, events); + + return ret; +} + +static void fsl_spi_grlib_cs_control(struct spi_device *spi, bool on) +{ + struct mpc8xxx_spi *mpc8xxx_spi = spi_master_get_devdata(spi->master); + struct fsl_spi_reg __iomem *reg_base = mpc8xxx_spi->reg_base; + u32 slvsel; + u16 cs = spi->chip_select; + + if (spi->cs_gpiod) { + gpiod_set_value(spi->cs_gpiod, on); + } else if (cs < mpc8xxx_spi->native_chipselects) { + slvsel = mpc8xxx_spi_read_reg(®_base->slvsel); + slvsel = on ? (slvsel | (1 << cs)) : (slvsel & ~(1 << cs)); + mpc8xxx_spi_write_reg(®_base->slvsel, slvsel); + } +} + +static void fsl_spi_grlib_probe(struct device *dev) +{ + struct fsl_spi_platform_data *pdata = dev_get_platdata(dev); + struct spi_master *master = dev_get_drvdata(dev); + struct mpc8xxx_spi *mpc8xxx_spi = spi_master_get_devdata(master); + struct fsl_spi_reg __iomem *reg_base = mpc8xxx_spi->reg_base; + int mbits; + u32 capabilities; + + capabilities = mpc8xxx_spi_read_reg(®_base->cap); + + mpc8xxx_spi->set_shifts = fsl_spi_grlib_set_shifts; + mbits = SPCAP_MAXWLEN(capabilities); + if (mbits) + mpc8xxx_spi->max_bits_per_word = mbits + 1; + + mpc8xxx_spi->native_chipselects = 0; + if (SPCAP_SSEN(capabilities)) { + mpc8xxx_spi->native_chipselects = SPCAP_SSSZ(capabilities); + mpc8xxx_spi_write_reg(®_base->slvsel, 0xffffffff); + } + master->num_chipselect = mpc8xxx_spi->native_chipselects; + pdata->cs_control = fsl_spi_grlib_cs_control; +} + +static struct spi_master *fsl_spi_probe(struct device *dev, + struct resource *mem, unsigned int irq) +{ + struct fsl_spi_platform_data *pdata = dev_get_platdata(dev); + struct spi_master *master; + struct mpc8xxx_spi *mpc8xxx_spi; + struct fsl_spi_reg __iomem *reg_base; + u32 regval; + int ret = 0; + + master = spi_alloc_master(dev, sizeof(struct mpc8xxx_spi)); + if (master == NULL) { + ret = -ENOMEM; + goto err; + } + + dev_set_drvdata(dev, master); + + mpc8xxx_spi_probe(dev, mem, irq); + + master->setup = fsl_spi_setup; + master->cleanup = fsl_spi_cleanup; + master->transfer_one_message = fsl_spi_do_one_msg; + master->use_gpio_descriptors = true; + + mpc8xxx_spi = spi_master_get_devdata(master); + mpc8xxx_spi->max_bits_per_word = 32; + mpc8xxx_spi->type = fsl_spi_get_type(dev); + + ret = fsl_spi_cpm_init(mpc8xxx_spi); + if (ret) + goto err_cpm_init; + + mpc8xxx_spi->reg_base = devm_ioremap_resource(dev, mem); + if (IS_ERR(mpc8xxx_spi->reg_base)) { + ret = PTR_ERR(mpc8xxx_spi->reg_base); + goto err_probe; + } + + if (mpc8xxx_spi->type == TYPE_GRLIB) + fsl_spi_grlib_probe(dev); + + if (mpc8xxx_spi->flags & SPI_CPM_MODE) + master->bits_per_word_mask = + (SPI_BPW_RANGE_MASK(4, 8) | SPI_BPW_MASK(16) | SPI_BPW_MASK(32)); + else + master->bits_per_word_mask = + (SPI_BPW_RANGE_MASK(4, 16) | SPI_BPW_MASK(32)); + + master->bits_per_word_mask &= + SPI_BPW_RANGE_MASK(1, mpc8xxx_spi->max_bits_per_word); + + if (mpc8xxx_spi->flags & SPI_QE_CPU_MODE) + mpc8xxx_spi->set_shifts = fsl_spi_qe_cpu_set_shifts; + + if (mpc8xxx_spi->set_shifts) + /* 8 bits per word and MSB first */ + mpc8xxx_spi->set_shifts(&mpc8xxx_spi->rx_shift, + &mpc8xxx_spi->tx_shift, 8, 1); + + /* Register for SPI Interrupt */ + ret = devm_request_irq(dev, mpc8xxx_spi->irq, fsl_spi_irq, + 0, "fsl_spi", mpc8xxx_spi); + + if (ret != 0) + goto err_probe; + + reg_base = mpc8xxx_spi->reg_base; + + /* SPI controller initializations */ + mpc8xxx_spi_write_reg(®_base->mode, 0); + mpc8xxx_spi_write_reg(®_base->mask, 0); + mpc8xxx_spi_write_reg(®_base->command, 0); + mpc8xxx_spi_write_reg(®_base->event, 0xffffffff); + + /* Enable SPI interface */ + regval = pdata->initial_spmode | SPMODE_INIT_VAL | SPMODE_ENABLE; + if (mpc8xxx_spi->max_bits_per_word < 8) { + regval &= ~SPMODE_LEN(0xF); + regval |= SPMODE_LEN(mpc8xxx_spi->max_bits_per_word - 1); + } + if (mpc8xxx_spi->flags & SPI_QE_CPU_MODE) + regval |= SPMODE_OP; + + mpc8xxx_spi_write_reg(®_base->mode, regval); + + ret = devm_spi_register_master(dev, master); + if (ret < 0) + goto err_probe; + + dev_info(dev, "at 0x%p (irq = %d), %s mode\n", reg_base, + mpc8xxx_spi->irq, mpc8xxx_spi_strmode(mpc8xxx_spi->flags)); + + return master; + +err_probe: + fsl_spi_cpm_free(mpc8xxx_spi); +err_cpm_init: + spi_master_put(master); +err: + return ERR_PTR(ret); +} + +static void fsl_spi_cs_control(struct spi_device *spi, bool on) +{ + if (spi->cs_gpiod) { + gpiod_set_value(spi->cs_gpiod, on); + } else { + struct device *dev = spi->dev.parent->parent; + struct fsl_spi_platform_data *pdata = dev_get_platdata(dev); + struct mpc8xxx_spi_probe_info *pinfo = to_of_pinfo(pdata); + + if (WARN_ON_ONCE(!pinfo->immr_spi_cs)) + return; + iowrite32be(on ? 0 : SPI_BOOT_SEL_BIT, pinfo->immr_spi_cs); + } +} + +static int of_fsl_spi_probe(struct platform_device *ofdev) +{ + struct device *dev = &ofdev->dev; + struct device_node *np = ofdev->dev.of_node; + struct spi_master *master; + struct resource mem; + int irq, type; + int ret; + bool spisel_boot = false; +#if IS_ENABLED(CONFIG_FSL_SOC) + struct mpc8xxx_spi_probe_info *pinfo = NULL; +#endif + + + ret = of_mpc8xxx_spi_probe(ofdev); + if (ret) + return ret; + + type = fsl_spi_get_type(&ofdev->dev); + if (type == TYPE_FSL) { + struct fsl_spi_platform_data *pdata = dev_get_platdata(dev); +#if IS_ENABLED(CONFIG_FSL_SOC) + pinfo = to_of_pinfo(pdata); + + spisel_boot = of_property_read_bool(np, "fsl,spisel_boot"); + if (spisel_boot) { + pinfo->immr_spi_cs = ioremap(get_immrbase() + IMMR_SPI_CS_OFFSET, 4); + if (!pinfo->immr_spi_cs) + return -ENOMEM; + } +#endif + /* + * Handle the case where we have one hardwired (always selected) + * device on the first "chipselect". Else we let the core code + * handle any GPIOs or native chip selects and assign the + * appropriate callback for dealing with the CS lines. This isn't + * supported on the GRLIB variant. + */ + ret = gpiod_count(dev, "cs"); + if (ret < 0) + ret = 0; + if (ret == 0 && !spisel_boot) { + pdata->max_chipselect = 1; + } else { + pdata->max_chipselect = ret + spisel_boot; + pdata->cs_control = fsl_spi_cs_control; + } + } + + ret = of_address_to_resource(np, 0, &mem); + if (ret) + goto unmap_out; + + irq = platform_get_irq(ofdev, 0); + if (irq < 0) { + ret = irq; + goto unmap_out; + } + + master = fsl_spi_probe(dev, &mem, irq); + + return PTR_ERR_OR_ZERO(master); + +unmap_out: +#if IS_ENABLED(CONFIG_FSL_SOC) + if (spisel_boot) + iounmap(pinfo->immr_spi_cs); +#endif + return ret; +} + +static int of_fsl_spi_remove(struct platform_device *ofdev) +{ + struct spi_master *master = platform_get_drvdata(ofdev); + struct mpc8xxx_spi *mpc8xxx_spi = spi_master_get_devdata(master); + + fsl_spi_cpm_free(mpc8xxx_spi); + return 0; +} + +static struct platform_driver of_fsl_spi_driver = { + .driver = { + .name = "fsl_spi", + .of_match_table = of_fsl_spi_match, + }, + .probe = of_fsl_spi_probe, + .remove = of_fsl_spi_remove, +}; + +#ifdef CONFIG_MPC832x_RDB +/* + * XXX XXX XXX + * This is "legacy" platform driver, was used by the MPC8323E-RDB boards + * only. The driver should go away soon, since newer MPC8323E-RDB's device + * tree can work with OpenFirmware driver. But for now we support old trees + * as well. + */ +static int plat_mpc8xxx_spi_probe(struct platform_device *pdev) +{ + struct resource *mem; + int irq; + struct spi_master *master; + + if (!dev_get_platdata(&pdev->dev)) + return -EINVAL; + + mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); + if (!mem) + return -EINVAL; + + irq = platform_get_irq(pdev, 0); + if (irq <= 0) + return -EINVAL; + + master = fsl_spi_probe(&pdev->dev, mem, irq); + return PTR_ERR_OR_ZERO(master); +} + +static int plat_mpc8xxx_spi_remove(struct platform_device *pdev) +{ + struct spi_master *master = platform_get_drvdata(pdev); + struct mpc8xxx_spi *mpc8xxx_spi = spi_master_get_devdata(master); + + fsl_spi_cpm_free(mpc8xxx_spi); + + return 0; +} + +MODULE_ALIAS("platform:mpc8xxx_spi"); +static struct platform_driver mpc8xxx_spi_driver = { + .probe = plat_mpc8xxx_spi_probe, + .remove = plat_mpc8xxx_spi_remove, + .driver = { + .name = "mpc8xxx_spi", + }, +}; + +static bool legacy_driver_failed; + +static void __init legacy_driver_register(void) +{ + legacy_driver_failed = platform_driver_register(&mpc8xxx_spi_driver); +} + +static void __exit legacy_driver_unregister(void) +{ + if (legacy_driver_failed) + return; + platform_driver_unregister(&mpc8xxx_spi_driver); +} +#else +static void __init legacy_driver_register(void) {} +static void __exit legacy_driver_unregister(void) {} +#endif /* CONFIG_MPC832x_RDB */ + +static int __init fsl_spi_init(void) +{ + legacy_driver_register(); + return platform_driver_register(&of_fsl_spi_driver); +} +module_init(fsl_spi_init); + +static void __exit fsl_spi_exit(void) +{ + platform_driver_unregister(&of_fsl_spi_driver); + legacy_driver_unregister(); +} +module_exit(fsl_spi_exit); + +MODULE_AUTHOR("Kumar Gala"); +MODULE_DESCRIPTION("Simple Freescale SPI Driver"); +MODULE_LICENSE("GPL"); diff --git a/drivers/spi/spi-fsl-spi.h b/drivers/spi/spi-fsl-spi.h new file mode 100644 index 000000000..fd8a5bef0 --- /dev/null +++ b/drivers/spi/spi-fsl-spi.h @@ -0,0 +1,68 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +/* + * Freescale SPI controller driver. + * + * Maintainer: Kumar Gala + * + * Copyright (C) 2006 Polycom, Inc. + * Copyright 2010 Freescale Semiconductor, Inc. + * + * CPM SPI and QE buffer descriptors mode support: + * Copyright (c) 2009 MontaVista Software, Inc. + * Author: Anton Vorontsov <avorontsov@ru.mvista.com> + * + * GRLIB support: + * Copyright (c) 2012 Aeroflex Gaisler AB. + * Author: Andreas Larsson <andreas@gaisler.com> + */ + +#ifndef __SPI_FSL_SPI_H__ +#define __SPI_FSL_SPI_H__ + +/* SPI Controller registers */ +struct fsl_spi_reg { + __be32 cap; /* TYPE_GRLIB specific */ + u8 res1[0x1C]; + __be32 mode; + __be32 event; + __be32 mask; + __be32 command; + __be32 transmit; + __be32 receive; + __be32 slvsel; /* TYPE_GRLIB specific */ +}; + +/* SPI Controller mode register definitions */ +#define SPMODE_LOOP (1 << 30) +#define SPMODE_CI_INACTIVEHIGH (1 << 29) +#define SPMODE_CP_BEGIN_EDGECLK (1 << 28) +#define SPMODE_DIV16 (1 << 27) +#define SPMODE_REV (1 << 26) +#define SPMODE_MS (1 << 25) +#define SPMODE_ENABLE (1 << 24) +#define SPMODE_LEN(x) ((x) << 20) +#define SPMODE_PM(x) ((x) << 16) +#define SPMODE_OP (1 << 14) +#define SPMODE_CG(x) ((x) << 7) + +/* TYPE_GRLIB SPI Controller capability register definitions */ +#define SPCAP_SSEN(x) (((x) >> 16) & 0x1) +#define SPCAP_SSSZ(x) (((x) >> 24) & 0xff) +#define SPCAP_MAXWLEN(x) (((x) >> 20) & 0xf) + +/* + * Default for SPI Mode: + * SPI MODE 0 (inactive low, phase middle, MSB, 8-bit length, slow clk + */ +#define SPMODE_INIT_VAL (SPMODE_CI_INACTIVEHIGH | SPMODE_DIV16 | SPMODE_REV | \ + SPMODE_MS | SPMODE_LEN(7) | SPMODE_PM(0xf)) + +/* SPIE register values */ +#define SPIE_NE 0x00000200 /* Not empty */ +#define SPIE_NF 0x00000100 /* Not full */ + +/* SPIM register values */ +#define SPIM_NE 0x00000200 /* Not empty */ +#define SPIM_NF 0x00000100 /* Not full */ + +#endif /* __SPI_FSL_SPI_H__ */ diff --git a/drivers/spi/spi-geni-qcom.c b/drivers/spi/spi-geni-qcom.c new file mode 100644 index 000000000..be259c685 --- /dev/null +++ b/drivers/spi/spi-geni-qcom.c @@ -0,0 +1,855 @@ +// SPDX-License-Identifier: GPL-2.0 +// Copyright (c) 2017-2018, The Linux foundation. All rights reserved. + +#include <linux/clk.h> +#include <linux/interrupt.h> +#include <linux/io.h> +#include <linux/log2.h> +#include <linux/module.h> +#include <linux/platform_device.h> +#include <linux/pm_opp.h> +#include <linux/pm_runtime.h> +#include <linux/qcom-geni-se.h> +#include <linux/spi/spi.h> +#include <linux/spinlock.h> + +/* SPI SE specific registers and respective register fields */ +#define SE_SPI_CPHA 0x224 +#define CPHA BIT(0) + +#define SE_SPI_LOOPBACK 0x22c +#define LOOPBACK_ENABLE 0x1 +#define NORMAL_MODE 0x0 +#define LOOPBACK_MSK GENMASK(1, 0) + +#define SE_SPI_CPOL 0x230 +#define CPOL BIT(2) + +#define SE_SPI_DEMUX_OUTPUT_INV 0x24c +#define CS_DEMUX_OUTPUT_INV_MSK GENMASK(3, 0) + +#define SE_SPI_DEMUX_SEL 0x250 +#define CS_DEMUX_OUTPUT_SEL GENMASK(3, 0) + +#define SE_SPI_TRANS_CFG 0x25c +#define CS_TOGGLE BIT(1) + +#define SE_SPI_WORD_LEN 0x268 +#define WORD_LEN_MSK GENMASK(9, 0) +#define MIN_WORD_LEN 4 + +#define SE_SPI_TX_TRANS_LEN 0x26c +#define SE_SPI_RX_TRANS_LEN 0x270 +#define TRANS_LEN_MSK GENMASK(23, 0) + +#define SE_SPI_PRE_POST_CMD_DLY 0x274 + +#define SE_SPI_DELAY_COUNTERS 0x278 +#define SPI_INTER_WORDS_DELAY_MSK GENMASK(9, 0) +#define SPI_CS_CLK_DELAY_MSK GENMASK(19, 10) +#define SPI_CS_CLK_DELAY_SHFT 10 + +/* M_CMD OP codes for SPI */ +#define SPI_TX_ONLY 1 +#define SPI_RX_ONLY 2 +#define SPI_TX_RX 7 +#define SPI_CS_ASSERT 8 +#define SPI_CS_DEASSERT 9 +#define SPI_SCK_ONLY 10 +/* M_CMD params for SPI */ +#define SPI_PRE_CMD_DELAY BIT(0) +#define TIMESTAMP_BEFORE BIT(1) +#define FRAGMENTATION BIT(2) +#define TIMESTAMP_AFTER BIT(3) +#define POST_CMD_DELAY BIT(4) + +struct spi_geni_master { + struct geni_se se; + struct device *dev; + u32 tx_fifo_depth; + u32 fifo_width_bits; + u32 tx_wm; + u32 last_mode; + unsigned long cur_speed_hz; + unsigned long cur_sclk_hz; + unsigned int cur_bits_per_word; + unsigned int tx_rem_bytes; + unsigned int rx_rem_bytes; + const struct spi_transfer *cur_xfer; + struct completion cs_done; + struct completion cancel_done; + struct completion abort_done; + unsigned int oversampling; + spinlock_t lock; + int irq; + bool cs_flag; + bool abort_failed; +}; + +static int get_spi_clk_cfg(unsigned int speed_hz, + struct spi_geni_master *mas, + unsigned int *clk_idx, + unsigned int *clk_div) +{ + unsigned long sclk_freq; + unsigned int actual_hz; + int ret; + + ret = geni_se_clk_freq_match(&mas->se, + speed_hz * mas->oversampling, + clk_idx, &sclk_freq, false); + if (ret) { + dev_err(mas->dev, "Failed(%d) to find src clk for %dHz\n", + ret, speed_hz); + return ret; + } + + *clk_div = DIV_ROUND_UP(sclk_freq, mas->oversampling * speed_hz); + actual_hz = sclk_freq / (mas->oversampling * *clk_div); + + dev_dbg(mas->dev, "req %u=>%u sclk %lu, idx %d, div %d\n", speed_hz, + actual_hz, sclk_freq, *clk_idx, *clk_div); + ret = dev_pm_opp_set_rate(mas->dev, sclk_freq); + if (ret) + dev_err(mas->dev, "dev_pm_opp_set_rate failed %d\n", ret); + else + mas->cur_sclk_hz = sclk_freq; + + return ret; +} + +static void handle_fifo_timeout(struct spi_master *spi, + struct spi_message *msg) +{ + struct spi_geni_master *mas = spi_master_get_devdata(spi); + unsigned long time_left; + struct geni_se *se = &mas->se; + + spin_lock_irq(&mas->lock); + reinit_completion(&mas->cancel_done); + writel(0, se->base + SE_GENI_TX_WATERMARK_REG); + mas->cur_xfer = NULL; + geni_se_cancel_m_cmd(se); + spin_unlock_irq(&mas->lock); + + time_left = wait_for_completion_timeout(&mas->cancel_done, HZ); + if (time_left) + return; + + spin_lock_irq(&mas->lock); + reinit_completion(&mas->abort_done); + geni_se_abort_m_cmd(se); + spin_unlock_irq(&mas->lock); + + time_left = wait_for_completion_timeout(&mas->abort_done, HZ); + if (!time_left) { + dev_err(mas->dev, "Failed to cancel/abort m_cmd\n"); + + /* + * No need for a lock since SPI core has a lock and we never + * access this from an interrupt. + */ + mas->abort_failed = true; + } +} + +static bool spi_geni_is_abort_still_pending(struct spi_geni_master *mas) +{ + struct geni_se *se = &mas->se; + u32 m_irq, m_irq_en; + + if (!mas->abort_failed) + return false; + + /* + * The only known case where a transfer times out and then a cancel + * times out then an abort times out is if something is blocking our + * interrupt handler from running. Avoid starting any new transfers + * until that sorts itself out. + */ + spin_lock_irq(&mas->lock); + m_irq = readl(se->base + SE_GENI_M_IRQ_STATUS); + m_irq_en = readl(se->base + SE_GENI_M_IRQ_EN); + spin_unlock_irq(&mas->lock); + + if (m_irq & m_irq_en) { + dev_err(mas->dev, "Interrupts pending after abort: %#010x\n", + m_irq & m_irq_en); + return true; + } + + /* + * If we're here the problem resolved itself so no need to check more + * on future transfers. + */ + mas->abort_failed = false; + + return false; +} + +static void spi_geni_set_cs(struct spi_device *slv, bool set_flag) +{ + struct spi_geni_master *mas = spi_master_get_devdata(slv->master); + struct spi_master *spi = dev_get_drvdata(mas->dev); + struct geni_se *se = &mas->se; + unsigned long time_left; + + if (!(slv->mode & SPI_CS_HIGH)) + set_flag = !set_flag; + + if (set_flag == mas->cs_flag) + return; + + pm_runtime_get_sync(mas->dev); + + if (spi_geni_is_abort_still_pending(mas)) { + dev_err(mas->dev, "Can't set chip select\n"); + goto exit; + } + + mas->cs_flag = set_flag; + + spin_lock_irq(&mas->lock); + reinit_completion(&mas->cs_done); + if (set_flag) + geni_se_setup_m_cmd(se, SPI_CS_ASSERT, 0); + else + geni_se_setup_m_cmd(se, SPI_CS_DEASSERT, 0); + spin_unlock_irq(&mas->lock); + + time_left = wait_for_completion_timeout(&mas->cs_done, HZ); + if (!time_left) + handle_fifo_timeout(spi, NULL); + +exit: + pm_runtime_put(mas->dev); +} + +static void spi_setup_word_len(struct spi_geni_master *mas, u16 mode, + unsigned int bits_per_word) +{ + unsigned int pack_words; + bool msb_first = (mode & SPI_LSB_FIRST) ? false : true; + struct geni_se *se = &mas->se; + u32 word_len; + + /* + * If bits_per_word isn't a byte aligned value, set the packing to be + * 1 SPI word per FIFO word. + */ + if (!(mas->fifo_width_bits % bits_per_word)) + pack_words = mas->fifo_width_bits / bits_per_word; + else + pack_words = 1; + geni_se_config_packing(&mas->se, bits_per_word, pack_words, msb_first, + true, true); + word_len = (bits_per_word - MIN_WORD_LEN) & WORD_LEN_MSK; + writel(word_len, se->base + SE_SPI_WORD_LEN); +} + +static int geni_spi_set_clock_and_bw(struct spi_geni_master *mas, + unsigned long clk_hz) +{ + u32 clk_sel, m_clk_cfg, idx, div; + struct geni_se *se = &mas->se; + int ret; + + if (clk_hz == mas->cur_speed_hz) + return 0; + + ret = get_spi_clk_cfg(clk_hz, mas, &idx, &div); + if (ret) { + dev_err(mas->dev, "Err setting clk to %lu: %d\n", clk_hz, ret); + return ret; + } + + /* + * SPI core clock gets configured with the requested frequency + * or the frequency closer to the requested frequency. + * For that reason requested frequency is stored in the + * cur_speed_hz and referred in the consecutive transfer instead + * of calling clk_get_rate() API. + */ + mas->cur_speed_hz = clk_hz; + + clk_sel = idx & CLK_SEL_MSK; + m_clk_cfg = (div << CLK_DIV_SHFT) | SER_CLK_EN; + writel(clk_sel, se->base + SE_GENI_CLK_SEL); + writel(m_clk_cfg, se->base + GENI_SER_M_CLK_CFG); + + /* Set BW quota for CPU as driver supports FIFO mode only. */ + se->icc_paths[CPU_TO_GENI].avg_bw = Bps_to_icc(mas->cur_speed_hz); + ret = geni_icc_set_bw(se); + if (ret) + return ret; + + return 0; +} + +static int setup_fifo_params(struct spi_device *spi_slv, + struct spi_master *spi) +{ + struct spi_geni_master *mas = spi_master_get_devdata(spi); + struct geni_se *se = &mas->se; + u32 loopback_cfg = 0, cpol = 0, cpha = 0, demux_output_inv = 0; + u32 demux_sel; + + if (mas->last_mode != spi_slv->mode) { + if (spi_slv->mode & SPI_LOOP) + loopback_cfg = LOOPBACK_ENABLE; + + if (spi_slv->mode & SPI_CPOL) + cpol = CPOL; + + if (spi_slv->mode & SPI_CPHA) + cpha = CPHA; + + if (spi_slv->mode & SPI_CS_HIGH) + demux_output_inv = BIT(spi_slv->chip_select); + + demux_sel = spi_slv->chip_select; + mas->cur_bits_per_word = spi_slv->bits_per_word; + + spi_setup_word_len(mas, spi_slv->mode, spi_slv->bits_per_word); + writel(loopback_cfg, se->base + SE_SPI_LOOPBACK); + writel(demux_sel, se->base + SE_SPI_DEMUX_SEL); + writel(cpha, se->base + SE_SPI_CPHA); + writel(cpol, se->base + SE_SPI_CPOL); + writel(demux_output_inv, se->base + SE_SPI_DEMUX_OUTPUT_INV); + + mas->last_mode = spi_slv->mode; + } + + return geni_spi_set_clock_and_bw(mas, spi_slv->max_speed_hz); +} + +static int spi_geni_prepare_message(struct spi_master *spi, + struct spi_message *spi_msg) +{ + int ret; + struct spi_geni_master *mas = spi_master_get_devdata(spi); + + if (spi_geni_is_abort_still_pending(mas)) + return -EBUSY; + + ret = setup_fifo_params(spi_msg->spi, spi); + if (ret) + dev_err(mas->dev, "Couldn't select mode %d\n", ret); + return ret; +} + +static int spi_geni_init(struct spi_geni_master *mas) +{ + struct geni_se *se = &mas->se; + unsigned int proto, major, minor, ver; + u32 spi_tx_cfg; + + pm_runtime_get_sync(mas->dev); + + proto = geni_se_read_proto(se); + if (proto != GENI_SE_SPI) { + dev_err(mas->dev, "Invalid proto %d\n", proto); + pm_runtime_put(mas->dev); + return -ENXIO; + } + mas->tx_fifo_depth = geni_se_get_tx_fifo_depth(se); + + /* Width of Tx and Rx FIFO is same */ + mas->fifo_width_bits = geni_se_get_tx_fifo_width(se); + + /* + * Hardware programming guide suggests to configure + * RX FIFO RFR level to fifo_depth-2. + */ + geni_se_init(se, mas->tx_fifo_depth - 3, mas->tx_fifo_depth - 2); + /* Transmit an entire FIFO worth of data per IRQ */ + mas->tx_wm = 1; + ver = geni_se_get_qup_hw_version(se); + major = GENI_SE_VERSION_MAJOR(ver); + minor = GENI_SE_VERSION_MINOR(ver); + + if (major == 1 && minor == 0) + mas->oversampling = 2; + else + mas->oversampling = 1; + + geni_se_select_mode(se, GENI_SE_FIFO); + + /* We always control CS manually */ + spi_tx_cfg = readl(se->base + SE_SPI_TRANS_CFG); + spi_tx_cfg &= ~CS_TOGGLE; + writel(spi_tx_cfg, se->base + SE_SPI_TRANS_CFG); + + pm_runtime_put(mas->dev); + return 0; +} + +static unsigned int geni_byte_per_fifo_word(struct spi_geni_master *mas) +{ + /* + * Calculate how many bytes we'll put in each FIFO word. If the + * transfer words don't pack cleanly into a FIFO word we'll just put + * one transfer word in each FIFO word. If they do pack we'll pack 'em. + */ + if (mas->fifo_width_bits % mas->cur_bits_per_word) + return roundup_pow_of_two(DIV_ROUND_UP(mas->cur_bits_per_word, + BITS_PER_BYTE)); + + return mas->fifo_width_bits / BITS_PER_BYTE; +} + +static bool geni_spi_handle_tx(struct spi_geni_master *mas) +{ + struct geni_se *se = &mas->se; + unsigned int max_bytes; + const u8 *tx_buf; + unsigned int bytes_per_fifo_word = geni_byte_per_fifo_word(mas); + unsigned int i = 0; + + /* Stop the watermark IRQ if nothing to send */ + if (!mas->cur_xfer) { + writel(0, se->base + SE_GENI_TX_WATERMARK_REG); + return false; + } + + max_bytes = (mas->tx_fifo_depth - mas->tx_wm) * bytes_per_fifo_word; + if (mas->tx_rem_bytes < max_bytes) + max_bytes = mas->tx_rem_bytes; + + tx_buf = mas->cur_xfer->tx_buf + mas->cur_xfer->len - mas->tx_rem_bytes; + while (i < max_bytes) { + unsigned int j; + unsigned int bytes_to_write; + u32 fifo_word = 0; + u8 *fifo_byte = (u8 *)&fifo_word; + + bytes_to_write = min(bytes_per_fifo_word, max_bytes - i); + for (j = 0; j < bytes_to_write; j++) + fifo_byte[j] = tx_buf[i++]; + iowrite32_rep(se->base + SE_GENI_TX_FIFOn, &fifo_word, 1); + } + mas->tx_rem_bytes -= max_bytes; + if (!mas->tx_rem_bytes) { + writel(0, se->base + SE_GENI_TX_WATERMARK_REG); + return false; + } + return true; +} + +static void geni_spi_handle_rx(struct spi_geni_master *mas) +{ + struct geni_se *se = &mas->se; + u32 rx_fifo_status; + unsigned int rx_bytes; + unsigned int rx_last_byte_valid; + u8 *rx_buf; + unsigned int bytes_per_fifo_word = geni_byte_per_fifo_word(mas); + unsigned int i = 0; + + rx_fifo_status = readl(se->base + SE_GENI_RX_FIFO_STATUS); + rx_bytes = (rx_fifo_status & RX_FIFO_WC_MSK) * bytes_per_fifo_word; + if (rx_fifo_status & RX_LAST) { + rx_last_byte_valid = rx_fifo_status & RX_LAST_BYTE_VALID_MSK; + rx_last_byte_valid >>= RX_LAST_BYTE_VALID_SHFT; + if (rx_last_byte_valid && rx_last_byte_valid < 4) + rx_bytes -= bytes_per_fifo_word - rx_last_byte_valid; + } + + /* Clear out the FIFO and bail if nowhere to put it */ + if (!mas->cur_xfer) { + for (i = 0; i < DIV_ROUND_UP(rx_bytes, bytes_per_fifo_word); i++) + readl(se->base + SE_GENI_RX_FIFOn); + return; + } + + if (mas->rx_rem_bytes < rx_bytes) + rx_bytes = mas->rx_rem_bytes; + + rx_buf = mas->cur_xfer->rx_buf + mas->cur_xfer->len - mas->rx_rem_bytes; + while (i < rx_bytes) { + u32 fifo_word = 0; + u8 *fifo_byte = (u8 *)&fifo_word; + unsigned int bytes_to_read; + unsigned int j; + + bytes_to_read = min(bytes_per_fifo_word, rx_bytes - i); + ioread32_rep(se->base + SE_GENI_RX_FIFOn, &fifo_word, 1); + for (j = 0; j < bytes_to_read; j++) + rx_buf[i++] = fifo_byte[j]; + } + mas->rx_rem_bytes -= rx_bytes; +} + +static void setup_fifo_xfer(struct spi_transfer *xfer, + struct spi_geni_master *mas, + u16 mode, struct spi_master *spi) +{ + u32 m_cmd = 0; + u32 len; + struct geni_se *se = &mas->se; + int ret; + + /* + * Ensure that our interrupt handler isn't still running from some + * prior command before we start messing with the hardware behind + * its back. We don't need to _keep_ the lock here since we're only + * worried about racing with out interrupt handler. The SPI core + * already handles making sure that we're not trying to do two + * transfers at once or setting a chip select and doing a transfer + * concurrently. + * + * NOTE: we actually _can't_ hold the lock here because possibly we + * might call clk_set_rate() which needs to be able to sleep. + */ + spin_lock_irq(&mas->lock); + spin_unlock_irq(&mas->lock); + + if (xfer->bits_per_word != mas->cur_bits_per_word) { + spi_setup_word_len(mas, mode, xfer->bits_per_word); + mas->cur_bits_per_word = xfer->bits_per_word; + } + + /* Speed and bits per word can be overridden per transfer */ + ret = geni_spi_set_clock_and_bw(mas, xfer->speed_hz); + if (ret) + return; + + mas->tx_rem_bytes = 0; + mas->rx_rem_bytes = 0; + + if (!(mas->cur_bits_per_word % MIN_WORD_LEN)) + len = xfer->len * BITS_PER_BYTE / mas->cur_bits_per_word; + else + len = xfer->len / (mas->cur_bits_per_word / BITS_PER_BYTE + 1); + len &= TRANS_LEN_MSK; + + mas->cur_xfer = xfer; + if (xfer->tx_buf) { + m_cmd |= SPI_TX_ONLY; + mas->tx_rem_bytes = xfer->len; + writel(len, se->base + SE_SPI_TX_TRANS_LEN); + } + + if (xfer->rx_buf) { + m_cmd |= SPI_RX_ONLY; + writel(len, se->base + SE_SPI_RX_TRANS_LEN); + mas->rx_rem_bytes = xfer->len; + } + + /* + * Lock around right before we start the transfer since our + * interrupt could come in at any time now. + */ + spin_lock_irq(&mas->lock); + geni_se_setup_m_cmd(se, m_cmd, FRAGMENTATION); + + /* + * TX_WATERMARK_REG should be set after SPI configuration and + * setting up GENI SE engine, as driver starts data transfer + * for the watermark interrupt. + */ + if (m_cmd & SPI_TX_ONLY) { + if (geni_spi_handle_tx(mas)) + writel(mas->tx_wm, se->base + SE_GENI_TX_WATERMARK_REG); + } + spin_unlock_irq(&mas->lock); +} + +static int spi_geni_transfer_one(struct spi_master *spi, + struct spi_device *slv, + struct spi_transfer *xfer) +{ + struct spi_geni_master *mas = spi_master_get_devdata(spi); + + if (spi_geni_is_abort_still_pending(mas)) + return -EBUSY; + + /* Terminate and return success for 0 byte length transfer */ + if (!xfer->len) + return 0; + + setup_fifo_xfer(xfer, mas, slv->mode, spi); + return 1; +} + +static irqreturn_t geni_spi_isr(int irq, void *data) +{ + struct spi_master *spi = data; + struct spi_geni_master *mas = spi_master_get_devdata(spi); + struct geni_se *se = &mas->se; + u32 m_irq; + + m_irq = readl(se->base + SE_GENI_M_IRQ_STATUS); + if (!m_irq) + return IRQ_NONE; + + if (m_irq & (M_CMD_OVERRUN_EN | M_ILLEGAL_CMD_EN | M_CMD_FAILURE_EN | + M_RX_FIFO_RD_ERR_EN | M_RX_FIFO_WR_ERR_EN | + M_TX_FIFO_RD_ERR_EN | M_TX_FIFO_WR_ERR_EN)) + dev_warn(mas->dev, "Unexpected IRQ err status %#010x\n", m_irq); + + spin_lock(&mas->lock); + + if ((m_irq & M_RX_FIFO_WATERMARK_EN) || (m_irq & M_RX_FIFO_LAST_EN)) + geni_spi_handle_rx(mas); + + if (m_irq & M_TX_FIFO_WATERMARK_EN) + geni_spi_handle_tx(mas); + + if (m_irq & M_CMD_DONE_EN) { + if (mas->cur_xfer) { + spi_finalize_current_transfer(spi); + mas->cur_xfer = NULL; + /* + * If this happens, then a CMD_DONE came before all the + * Tx buffer bytes were sent out. This is unusual, log + * this condition and disable the WM interrupt to + * prevent the system from stalling due an interrupt + * storm. + * + * If this happens when all Rx bytes haven't been + * received, log the condition. The only known time + * this can happen is if bits_per_word != 8 and some + * registers that expect xfer lengths in num spi_words + * weren't written correctly. + */ + if (mas->tx_rem_bytes) { + writel(0, se->base + SE_GENI_TX_WATERMARK_REG); + dev_err(mas->dev, "Premature done. tx_rem = %d bpw%d\n", + mas->tx_rem_bytes, mas->cur_bits_per_word); + } + if (mas->rx_rem_bytes) + dev_err(mas->dev, "Premature done. rx_rem = %d bpw%d\n", + mas->rx_rem_bytes, mas->cur_bits_per_word); + } else { + complete(&mas->cs_done); + } + } + + if (m_irq & M_CMD_CANCEL_EN) + complete(&mas->cancel_done); + if (m_irq & M_CMD_ABORT_EN) + complete(&mas->abort_done); + + /* + * It's safe or a good idea to Ack all of our our interrupts at the + * end of the function. Specifically: + * - M_CMD_DONE_EN / M_RX_FIFO_LAST_EN: Edge triggered interrupts and + * clearing Acks. Clearing at the end relies on nobody else having + * started a new transfer yet or else we could be clearing _their_ + * done bit, but everyone grabs the spinlock before starting a new + * transfer. + * - M_RX_FIFO_WATERMARK_EN / M_TX_FIFO_WATERMARK_EN: These appear + * to be "latched level" interrupts so it's important to clear them + * _after_ you've handled the condition and always safe to do so + * since they'll re-assert if they're still happening. + */ + writel(m_irq, se->base + SE_GENI_M_IRQ_CLEAR); + + spin_unlock(&mas->lock); + + return IRQ_HANDLED; +} + +static int spi_geni_probe(struct platform_device *pdev) +{ + int ret, irq; + struct spi_master *spi; + struct spi_geni_master *mas; + void __iomem *base; + struct clk *clk; + struct device *dev = &pdev->dev; + + irq = platform_get_irq(pdev, 0); + if (irq < 0) + return irq; + + base = devm_platform_ioremap_resource(pdev, 0); + if (IS_ERR(base)) + return PTR_ERR(base); + + clk = devm_clk_get(dev, "se"); + if (IS_ERR(clk)) + return PTR_ERR(clk); + + spi = devm_spi_alloc_master(dev, sizeof(*mas)); + if (!spi) + return -ENOMEM; + + platform_set_drvdata(pdev, spi); + mas = spi_master_get_devdata(spi); + mas->irq = irq; + mas->dev = dev; + mas->se.dev = dev; + mas->se.wrapper = dev_get_drvdata(dev->parent); + mas->se.base = base; + mas->se.clk = clk; + mas->se.opp_table = dev_pm_opp_set_clkname(&pdev->dev, "se"); + if (IS_ERR(mas->se.opp_table)) + return PTR_ERR(mas->se.opp_table); + /* OPP table is optional */ + ret = dev_pm_opp_of_add_table(&pdev->dev); + if (ret && ret != -ENODEV) { + dev_err(&pdev->dev, "invalid OPP table in device tree\n"); + goto put_clkname; + } + + spi->bus_num = -1; + spi->dev.of_node = dev->of_node; + spi->mode_bits = SPI_CPOL | SPI_CPHA | SPI_LOOP | SPI_CS_HIGH; + spi->bits_per_word_mask = SPI_BPW_RANGE_MASK(4, 32); + spi->num_chipselect = 4; + spi->max_speed_hz = 50000000; + spi->prepare_message = spi_geni_prepare_message; + spi->transfer_one = spi_geni_transfer_one; + spi->auto_runtime_pm = true; + spi->handle_err = handle_fifo_timeout; + spi->set_cs = spi_geni_set_cs; + + init_completion(&mas->cs_done); + init_completion(&mas->cancel_done); + init_completion(&mas->abort_done); + spin_lock_init(&mas->lock); + pm_runtime_use_autosuspend(&pdev->dev); + pm_runtime_set_autosuspend_delay(&pdev->dev, 250); + pm_runtime_enable(dev); + + ret = geni_icc_get(&mas->se, NULL); + if (ret) + goto spi_geni_probe_runtime_disable; + /* Set the bus quota to a reasonable value for register access */ + mas->se.icc_paths[GENI_TO_CORE].avg_bw = Bps_to_icc(CORE_2X_50_MHZ); + mas->se.icc_paths[CPU_TO_GENI].avg_bw = GENI_DEFAULT_BW; + + ret = geni_icc_set_bw(&mas->se); + if (ret) + goto spi_geni_probe_runtime_disable; + + ret = spi_geni_init(mas); + if (ret) + goto spi_geni_probe_runtime_disable; + + ret = request_irq(mas->irq, geni_spi_isr, 0, dev_name(dev), spi); + if (ret) + goto spi_geni_probe_runtime_disable; + + ret = spi_register_master(spi); + if (ret) + goto spi_geni_probe_free_irq; + + return 0; +spi_geni_probe_free_irq: + free_irq(mas->irq, spi); +spi_geni_probe_runtime_disable: + pm_runtime_disable(dev); + dev_pm_opp_of_remove_table(&pdev->dev); +put_clkname: + dev_pm_opp_put_clkname(mas->se.opp_table); + return ret; +} + +static int spi_geni_remove(struct platform_device *pdev) +{ + struct spi_master *spi = platform_get_drvdata(pdev); + struct spi_geni_master *mas = spi_master_get_devdata(spi); + + /* Unregister _before_ disabling pm_runtime() so we stop transfers */ + spi_unregister_master(spi); + + free_irq(mas->irq, spi); + pm_runtime_disable(&pdev->dev); + dev_pm_opp_of_remove_table(&pdev->dev); + dev_pm_opp_put_clkname(mas->se.opp_table); + return 0; +} + +static int __maybe_unused spi_geni_runtime_suspend(struct device *dev) +{ + struct spi_master *spi = dev_get_drvdata(dev); + struct spi_geni_master *mas = spi_master_get_devdata(spi); + int ret; + + /* Drop the performance state vote */ + dev_pm_opp_set_rate(dev, 0); + + ret = geni_se_resources_off(&mas->se); + if (ret) + return ret; + + return geni_icc_disable(&mas->se); +} + +static int __maybe_unused spi_geni_runtime_resume(struct device *dev) +{ + struct spi_master *spi = dev_get_drvdata(dev); + struct spi_geni_master *mas = spi_master_get_devdata(spi); + int ret; + + ret = geni_icc_enable(&mas->se); + if (ret) + return ret; + + ret = geni_se_resources_on(&mas->se); + if (ret) + return ret; + + return dev_pm_opp_set_rate(mas->dev, mas->cur_sclk_hz); +} + +static int __maybe_unused spi_geni_suspend(struct device *dev) +{ + struct spi_master *spi = dev_get_drvdata(dev); + int ret; + + ret = spi_master_suspend(spi); + if (ret) + return ret; + + ret = pm_runtime_force_suspend(dev); + if (ret) + spi_master_resume(spi); + + return ret; +} + +static int __maybe_unused spi_geni_resume(struct device *dev) +{ + struct spi_master *spi = dev_get_drvdata(dev); + int ret; + + ret = pm_runtime_force_resume(dev); + if (ret) + return ret; + + ret = spi_master_resume(spi); + if (ret) + pm_runtime_force_suspend(dev); + + return ret; +} + +static const struct dev_pm_ops spi_geni_pm_ops = { + SET_RUNTIME_PM_OPS(spi_geni_runtime_suspend, + spi_geni_runtime_resume, NULL) + SET_SYSTEM_SLEEP_PM_OPS(spi_geni_suspend, spi_geni_resume) +}; + +static const struct of_device_id spi_geni_dt_match[] = { + { .compatible = "qcom,geni-spi" }, + {} +}; +MODULE_DEVICE_TABLE(of, spi_geni_dt_match); + +static struct platform_driver spi_geni_driver = { + .probe = spi_geni_probe, + .remove = spi_geni_remove, + .driver = { + .name = "geni_spi", + .pm = &spi_geni_pm_ops, + .of_match_table = spi_geni_dt_match, + }, +}; +module_platform_driver(spi_geni_driver); + +MODULE_DESCRIPTION("SPI driver for GENI based QUP cores"); +MODULE_LICENSE("GPL v2"); diff --git a/drivers/spi/spi-gpio.c b/drivers/spi/spi-gpio.c new file mode 100644 index 000000000..3ffdab6ca --- /dev/null +++ b/drivers/spi/spi-gpio.c @@ -0,0 +1,450 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * SPI master driver using generic bitbanged GPIO + * + * Copyright (C) 2006,2008 David Brownell + * Copyright (C) 2017 Linus Walleij + */ +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/platform_device.h> +#include <linux/gpio/consumer.h> +#include <linux/of.h> +#include <linux/of_device.h> + +#include <linux/spi/spi.h> +#include <linux/spi/spi_bitbang.h> +#include <linux/spi/spi_gpio.h> + + +/* + * This bitbanging SPI master driver should help make systems usable + * when a native hardware SPI engine is not available, perhaps because + * its driver isn't yet working or because the I/O pins it requires + * are used for other purposes. + * + * platform_device->driver_data ... points to spi_gpio + * + * spi->controller_state ... reserved for bitbang framework code + * + * spi->master->dev.driver_data ... points to spi_gpio->bitbang + */ + +struct spi_gpio { + struct spi_bitbang bitbang; + struct gpio_desc *sck; + struct gpio_desc *miso; + struct gpio_desc *mosi; + struct gpio_desc **cs_gpios; +}; + +/*----------------------------------------------------------------------*/ + +/* + * Because the overhead of going through four GPIO procedure calls + * per transferred bit can make performance a problem, this code + * is set up so that you can use it in either of two ways: + * + * - The slow generic way: set up platform_data to hold the GPIO + * numbers used for MISO/MOSI/SCK, and issue procedure calls for + * each of them. This driver can handle several such busses. + * + * - The quicker inlined way: only helps with platform GPIO code + * that inlines operations for constant GPIOs. This can give + * you tight (fast!) inner loops, but each such bus needs a + * new driver. You'll define a new C file, with Makefile and + * Kconfig support; the C code can be a total of six lines: + * + * #define DRIVER_NAME "myboard_spi2" + * #define SPI_MISO_GPIO 119 + * #define SPI_MOSI_GPIO 120 + * #define SPI_SCK_GPIO 121 + * #define SPI_N_CHIPSEL 4 + * #include "spi-gpio.c" + */ + +#ifndef DRIVER_NAME +#define DRIVER_NAME "spi_gpio" + +#define GENERIC_BITBANG /* vs tight inlines */ + +#endif + +/*----------------------------------------------------------------------*/ + +static inline struct spi_gpio *__pure +spi_to_spi_gpio(const struct spi_device *spi) +{ + const struct spi_bitbang *bang; + struct spi_gpio *spi_gpio; + + bang = spi_master_get_devdata(spi->master); + spi_gpio = container_of(bang, struct spi_gpio, bitbang); + return spi_gpio; +} + +/* These helpers are in turn called by the bitbang inlines */ +static inline void setsck(const struct spi_device *spi, int is_on) +{ + struct spi_gpio *spi_gpio = spi_to_spi_gpio(spi); + + gpiod_set_value_cansleep(spi_gpio->sck, is_on); +} + +static inline void setmosi(const struct spi_device *spi, int is_on) +{ + struct spi_gpio *spi_gpio = spi_to_spi_gpio(spi); + + gpiod_set_value_cansleep(spi_gpio->mosi, is_on); +} + +static inline int getmiso(const struct spi_device *spi) +{ + struct spi_gpio *spi_gpio = spi_to_spi_gpio(spi); + + if (spi->mode & SPI_3WIRE) + return !!gpiod_get_value_cansleep(spi_gpio->mosi); + else + return !!gpiod_get_value_cansleep(spi_gpio->miso); +} + +/* + * NOTE: this clocks "as fast as we can". It "should" be a function of the + * requested device clock. Software overhead means we usually have trouble + * reaching even one Mbit/sec (except when we can inline bitops), so for now + * we'll just assume we never need additional per-bit slowdowns. + */ +#define spidelay(nsecs) do {} while (0) + +#include "spi-bitbang-txrx.h" + +/* + * These functions can leverage inline expansion of GPIO calls to shrink + * costs for a txrx bit, often by factors of around ten (by instruction + * count). That is particularly visible for larger word sizes, but helps + * even with default 8-bit words. + * + * REVISIT overheads calling these functions for each word also have + * significant performance costs. Having txrx_bufs() calls that inline + * the txrx_word() logic would help performance, e.g. on larger blocks + * used with flash storage or MMC/SD. There should also be ways to make + * GCC be less stupid about reloading registers inside the I/O loops, + * even without inlined GPIO calls; __attribute__((hot)) on GCC 4.3? + */ + +static u32 spi_gpio_txrx_word_mode0(struct spi_device *spi, + unsigned nsecs, u32 word, u8 bits, unsigned flags) +{ + return bitbang_txrx_be_cpha0(spi, nsecs, 0, flags, word, bits); +} + +static u32 spi_gpio_txrx_word_mode1(struct spi_device *spi, + unsigned nsecs, u32 word, u8 bits, unsigned flags) +{ + return bitbang_txrx_be_cpha1(spi, nsecs, 0, flags, word, bits); +} + +static u32 spi_gpio_txrx_word_mode2(struct spi_device *spi, + unsigned nsecs, u32 word, u8 bits, unsigned flags) +{ + return bitbang_txrx_be_cpha0(spi, nsecs, 1, flags, word, bits); +} + +static u32 spi_gpio_txrx_word_mode3(struct spi_device *spi, + unsigned nsecs, u32 word, u8 bits, unsigned flags) +{ + return bitbang_txrx_be_cpha1(spi, nsecs, 1, flags, word, bits); +} + +/* + * These functions do not call setmosi or getmiso if respective flag + * (SPI_MASTER_NO_RX or SPI_MASTER_NO_TX) is set, so they are safe to + * call when such pin is not present or defined in the controller. + * A separate set of callbacks is defined to get highest possible + * speed in the generic case (when both MISO and MOSI lines are + * available), as optimiser will remove the checks when argument is + * constant. + */ + +static u32 spi_gpio_spec_txrx_word_mode0(struct spi_device *spi, + unsigned nsecs, u32 word, u8 bits, unsigned flags) +{ + flags = spi->master->flags; + return bitbang_txrx_be_cpha0(spi, nsecs, 0, flags, word, bits); +} + +static u32 spi_gpio_spec_txrx_word_mode1(struct spi_device *spi, + unsigned nsecs, u32 word, u8 bits, unsigned flags) +{ + flags = spi->master->flags; + return bitbang_txrx_be_cpha1(spi, nsecs, 0, flags, word, bits); +} + +static u32 spi_gpio_spec_txrx_word_mode2(struct spi_device *spi, + unsigned nsecs, u32 word, u8 bits, unsigned flags) +{ + flags = spi->master->flags; + return bitbang_txrx_be_cpha0(spi, nsecs, 1, flags, word, bits); +} + +static u32 spi_gpio_spec_txrx_word_mode3(struct spi_device *spi, + unsigned nsecs, u32 word, u8 bits, unsigned flags) +{ + flags = spi->master->flags; + return bitbang_txrx_be_cpha1(spi, nsecs, 1, flags, word, bits); +} + +/*----------------------------------------------------------------------*/ + +static void spi_gpio_chipselect(struct spi_device *spi, int is_active) +{ + struct spi_gpio *spi_gpio = spi_to_spi_gpio(spi); + + /* set initial clock line level */ + if (is_active) + gpiod_set_value_cansleep(spi_gpio->sck, spi->mode & SPI_CPOL); + + /* Drive chip select line, if we have one */ + if (spi_gpio->cs_gpios) { + struct gpio_desc *cs = spi_gpio->cs_gpios[spi->chip_select]; + + /* SPI chip selects are normally active-low */ + gpiod_set_value_cansleep(cs, (spi->mode & SPI_CS_HIGH) ? is_active : !is_active); + } +} + +static int spi_gpio_setup(struct spi_device *spi) +{ + struct gpio_desc *cs; + int status = 0; + struct spi_gpio *spi_gpio = spi_to_spi_gpio(spi); + + /* + * The CS GPIOs have already been + * initialized from the descriptor lookup. + */ + if (spi_gpio->cs_gpios) { + cs = spi_gpio->cs_gpios[spi->chip_select]; + if (!spi->controller_state && cs) + status = gpiod_direction_output(cs, + !(spi->mode & SPI_CS_HIGH)); + } + + if (!status) + status = spi_bitbang_setup(spi); + + return status; +} + +static int spi_gpio_set_direction(struct spi_device *spi, bool output) +{ + struct spi_gpio *spi_gpio = spi_to_spi_gpio(spi); + int ret; + + if (output) + return gpiod_direction_output(spi_gpio->mosi, 1); + + /* + * Only change MOSI to an input if using 3WIRE mode. + * Otherwise, MOSI could be left floating if there is + * no pull resistor connected to the I/O pin, or could + * be left logic high if there is a pull-up. Transmitting + * logic high when only clocking MISO data in can put some + * SPI devices in to a bad state. + */ + if (spi->mode & SPI_3WIRE) { + ret = gpiod_direction_input(spi_gpio->mosi); + if (ret) + return ret; + } + /* + * Send a turnaround high impedance cycle when switching + * from output to input. Theoretically there should be + * a clock delay here, but as has been noted above, the + * nsec delay function for bit-banged GPIO is simply + * {} because bit-banging just doesn't get fast enough + * anyway. + */ + if (spi->mode & SPI_3WIRE_HIZ) { + gpiod_set_value_cansleep(spi_gpio->sck, + !(spi->mode & SPI_CPOL)); + gpiod_set_value_cansleep(spi_gpio->sck, + !!(spi->mode & SPI_CPOL)); + } + return 0; +} + +static void spi_gpio_cleanup(struct spi_device *spi) +{ + spi_bitbang_cleanup(spi); +} + +/* + * It can be convenient to use this driver with pins that have alternate + * functions associated with a "native" SPI controller if a driver for that + * controller is not available, or is missing important functionality. + * + * On platforms which can do so, configure MISO with a weak pullup unless + * there's an external pullup on that signal. That saves power by avoiding + * floating signals. (A weak pulldown would save power too, but many + * drivers expect to see all-ones data as the no slave "response".) + */ +static int spi_gpio_request(struct device *dev, struct spi_gpio *spi_gpio) +{ + spi_gpio->mosi = devm_gpiod_get_optional(dev, "mosi", GPIOD_OUT_LOW); + if (IS_ERR(spi_gpio->mosi)) + return PTR_ERR(spi_gpio->mosi); + + spi_gpio->miso = devm_gpiod_get_optional(dev, "miso", GPIOD_IN); + if (IS_ERR(spi_gpio->miso)) + return PTR_ERR(spi_gpio->miso); + + spi_gpio->sck = devm_gpiod_get(dev, "sck", GPIOD_OUT_LOW); + return PTR_ERR_OR_ZERO(spi_gpio->sck); +} + +#ifdef CONFIG_OF +static const struct of_device_id spi_gpio_dt_ids[] = { + { .compatible = "spi-gpio" }, + {} +}; +MODULE_DEVICE_TABLE(of, spi_gpio_dt_ids); + +static int spi_gpio_probe_dt(struct platform_device *pdev, + struct spi_master *master) +{ + master->dev.of_node = pdev->dev.of_node; + master->use_gpio_descriptors = true; + + return 0; +} +#else +static inline int spi_gpio_probe_dt(struct platform_device *pdev, + struct spi_master *master) +{ + return 0; +} +#endif + +static int spi_gpio_probe_pdata(struct platform_device *pdev, + struct spi_master *master) +{ + struct device *dev = &pdev->dev; + struct spi_gpio_platform_data *pdata = dev_get_platdata(dev); + struct spi_gpio *spi_gpio = spi_master_get_devdata(master); + int i; + +#ifdef GENERIC_BITBANG + if (!pdata || !pdata->num_chipselect) + return -ENODEV; +#endif + /* + * The master needs to think there is a chipselect even if not + * connected + */ + master->num_chipselect = pdata->num_chipselect ?: 1; + + spi_gpio->cs_gpios = devm_kcalloc(dev, master->num_chipselect, + sizeof(*spi_gpio->cs_gpios), + GFP_KERNEL); + if (!spi_gpio->cs_gpios) + return -ENOMEM; + + for (i = 0; i < master->num_chipselect; i++) { + spi_gpio->cs_gpios[i] = devm_gpiod_get_index(dev, "cs", i, + GPIOD_OUT_HIGH); + if (IS_ERR(spi_gpio->cs_gpios[i])) + return PTR_ERR(spi_gpio->cs_gpios[i]); + } + + return 0; +} + +static int spi_gpio_probe(struct platform_device *pdev) +{ + int status; + struct spi_master *master; + struct spi_gpio *spi_gpio; + struct device *dev = &pdev->dev; + struct spi_bitbang *bb; + + master = devm_spi_alloc_master(dev, sizeof(*spi_gpio)); + if (!master) + return -ENOMEM; + + if (pdev->dev.of_node) + status = spi_gpio_probe_dt(pdev, master); + else + status = spi_gpio_probe_pdata(pdev, master); + + if (status) + return status; + + spi_gpio = spi_master_get_devdata(master); + + status = spi_gpio_request(dev, spi_gpio); + if (status) + return status; + + master->bits_per_word_mask = SPI_BPW_RANGE_MASK(1, 32); + master->mode_bits = SPI_3WIRE | SPI_3WIRE_HIZ | SPI_CPHA | SPI_CPOL | + SPI_CS_HIGH; + if (!spi_gpio->mosi) { + /* HW configuration without MOSI pin + * + * No setting SPI_MASTER_NO_RX here - if there is only + * a MOSI pin connected the host can still do RX by + * changing the direction of the line. + */ + master->flags = SPI_MASTER_NO_TX; + } + + master->bus_num = pdev->id; + master->setup = spi_gpio_setup; + master->cleanup = spi_gpio_cleanup; + + bb = &spi_gpio->bitbang; + bb->master = master; + /* + * There is some additional business, apart from driving the CS GPIO + * line, that we need to do on selection. This makes the local + * callback for chipselect always get called. + */ + master->flags |= SPI_MASTER_GPIO_SS; + bb->chipselect = spi_gpio_chipselect; + bb->set_line_direction = spi_gpio_set_direction; + + if (master->flags & SPI_MASTER_NO_TX) { + bb->txrx_word[SPI_MODE_0] = spi_gpio_spec_txrx_word_mode0; + bb->txrx_word[SPI_MODE_1] = spi_gpio_spec_txrx_word_mode1; + bb->txrx_word[SPI_MODE_2] = spi_gpio_spec_txrx_word_mode2; + bb->txrx_word[SPI_MODE_3] = spi_gpio_spec_txrx_word_mode3; + } else { + bb->txrx_word[SPI_MODE_0] = spi_gpio_txrx_word_mode0; + bb->txrx_word[SPI_MODE_1] = spi_gpio_txrx_word_mode1; + bb->txrx_word[SPI_MODE_2] = spi_gpio_txrx_word_mode2; + bb->txrx_word[SPI_MODE_3] = spi_gpio_txrx_word_mode3; + } + bb->setup_transfer = spi_bitbang_setup_transfer; + + status = spi_bitbang_init(&spi_gpio->bitbang); + if (status) + return status; + + return devm_spi_register_master(&pdev->dev, master); +} + +MODULE_ALIAS("platform:" DRIVER_NAME); + +static struct platform_driver spi_gpio_driver = { + .driver = { + .name = DRIVER_NAME, + .of_match_table = of_match_ptr(spi_gpio_dt_ids), + }, + .probe = spi_gpio_probe, +}; +module_platform_driver(spi_gpio_driver); + +MODULE_DESCRIPTION("SPI master driver using generic bitbanged GPIO "); +MODULE_AUTHOR("David Brownell"); +MODULE_LICENSE("GPL"); diff --git a/drivers/spi/spi-hisi-sfc-v3xx.c b/drivers/spi/spi-hisi-sfc-v3xx.c new file mode 100644 index 000000000..4650b483a --- /dev/null +++ b/drivers/spi/spi-hisi-sfc-v3xx.c @@ -0,0 +1,524 @@ +// SPDX-License-Identifier: GPL-2.0-only +// +// HiSilicon SPI NOR V3XX Flash Controller Driver for hi16xx chipsets +// +// Copyright (c) 2019 HiSilicon Technologies Co., Ltd. +// Author: John Garry <john.garry@huawei.com> + +#include <linux/acpi.h> +#include <linux/bitops.h> +#include <linux/completion.h> +#include <linux/dmi.h> +#include <linux/interrupt.h> +#include <linux/iopoll.h> +#include <linux/module.h> +#include <linux/platform_device.h> +#include <linux/slab.h> +#include <linux/spi/spi.h> +#include <linux/spi/spi-mem.h> + +#define HISI_SFC_V3XX_VERSION (0x1f8) + +#define HISI_SFC_V3XX_RAW_INT_STAT (0x120) +#define HISI_SFC_V3XX_INT_STAT (0x124) +#define HISI_SFC_V3XX_INT_MASK (0x128) +#define HISI_SFC_V3XX_INT_CLR (0x12c) +#define HISI_SFC_V3XX_CMD_CFG (0x300) +#define HISI_SFC_V3XX_CMD_CFG_DATA_CNT_OFF 9 +#define HISI_SFC_V3XX_CMD_CFG_RW_MSK BIT(8) +#define HISI_SFC_V3XX_CMD_CFG_DATA_EN_MSK BIT(7) +#define HISI_SFC_V3XX_CMD_CFG_DUMMY_CNT_OFF 4 +#define HISI_SFC_V3XX_CMD_CFG_ADDR_EN_MSK BIT(3) +#define HISI_SFC_V3XX_CMD_CFG_CS_SEL_OFF 1 +#define HISI_SFC_V3XX_CMD_CFG_START_MSK BIT(0) +#define HISI_SFC_V3XX_CMD_INS (0x308) +#define HISI_SFC_V3XX_CMD_ADDR (0x30c) +#define HISI_SFC_V3XX_CMD_DATABUF0 (0x400) + +/* Common definition of interrupt bit masks */ +#define HISI_SFC_V3XX_INT_MASK_ALL (0x1ff) /* all the masks */ +#define HISI_SFC_V3XX_INT_MASK_CPLT BIT(0) /* command execution complete */ +#define HISI_SFC_V3XX_INT_MASK_PP_ERR BIT(2) /* page progrom error */ +#define HISI_SFC_V3XX_INT_MASK_IACCES BIT(5) /* error visiting inaccessible/ + * protected address + */ + +/* IO Mode definition in HISI_SFC_V3XX_CMD_CFG */ +#define HISI_SFC_V3XX_STD (0 << 17) +#define HISI_SFC_V3XX_DIDO (1 << 17) +#define HISI_SFC_V3XX_DIO (2 << 17) +#define HISI_SFC_V3XX_FULL_DIO (3 << 17) +#define HISI_SFC_V3XX_QIQO (5 << 17) +#define HISI_SFC_V3XX_QIO (6 << 17) +#define HISI_SFC_V3XX_FULL_QIO (7 << 17) + +/* + * The IO modes lookup table. hisi_sfc_v3xx_io_modes[(z - 1) / 2][y / 2][x / 2] + * stands for x-y-z mode, as described in SFDP terminology. -EIO indicates + * an invalid mode. + */ +static const int hisi_sfc_v3xx_io_modes[2][3][3] = { + { + { HISI_SFC_V3XX_DIDO, HISI_SFC_V3XX_DIDO, HISI_SFC_V3XX_DIDO }, + { HISI_SFC_V3XX_DIO, HISI_SFC_V3XX_FULL_DIO, -EIO }, + { -EIO, -EIO, -EIO }, + }, + { + { HISI_SFC_V3XX_QIQO, HISI_SFC_V3XX_QIQO, HISI_SFC_V3XX_QIQO }, + { -EIO, -EIO, -EIO }, + { HISI_SFC_V3XX_QIO, -EIO, HISI_SFC_V3XX_FULL_QIO }, + }, +}; + +struct hisi_sfc_v3xx_host { + struct device *dev; + void __iomem *regbase; + int max_cmd_dword; + struct completion *completion; + int irq; +}; + +static void hisi_sfc_v3xx_disable_int(struct hisi_sfc_v3xx_host *host) +{ + writel(0, host->regbase + HISI_SFC_V3XX_INT_MASK); +} + +static void hisi_sfc_v3xx_enable_int(struct hisi_sfc_v3xx_host *host) +{ + writel(HISI_SFC_V3XX_INT_MASK_ALL, host->regbase + HISI_SFC_V3XX_INT_MASK); +} + +static void hisi_sfc_v3xx_clear_int(struct hisi_sfc_v3xx_host *host) +{ + writel(HISI_SFC_V3XX_INT_MASK_ALL, host->regbase + HISI_SFC_V3XX_INT_CLR); +} + +/* + * The interrupt status register indicates whether an error occurs + * after per operation. Check it, and clear the interrupts for + * next time judgement. + */ +static int hisi_sfc_v3xx_handle_completion(struct hisi_sfc_v3xx_host *host) +{ + u32 reg; + + reg = readl(host->regbase + HISI_SFC_V3XX_RAW_INT_STAT); + hisi_sfc_v3xx_clear_int(host); + + if (reg & HISI_SFC_V3XX_INT_MASK_IACCES) { + dev_err(host->dev, "fail to access protected address\n"); + return -EIO; + } + + if (reg & HISI_SFC_V3XX_INT_MASK_PP_ERR) { + dev_err(host->dev, "page program operation failed\n"); + return -EIO; + } + + /* + * The other bits of the interrupt registers is not currently + * used and probably not be triggered in this driver. When it + * happens, we regard it as an unsupported error here. + */ + if (!(reg & HISI_SFC_V3XX_INT_MASK_CPLT)) { + dev_err(host->dev, "unsupported error occurred, status=0x%x\n", reg); + return -EIO; + } + + return 0; +} + +#define HISI_SFC_V3XX_WAIT_TIMEOUT_US 1000000 +#define HISI_SFC_V3XX_WAIT_POLL_INTERVAL_US 10 + +static int hisi_sfc_v3xx_wait_cmd_idle(struct hisi_sfc_v3xx_host *host) +{ + u32 reg; + + return readl_poll_timeout(host->regbase + HISI_SFC_V3XX_CMD_CFG, reg, + !(reg & HISI_SFC_V3XX_CMD_CFG_START_MSK), + HISI_SFC_V3XX_WAIT_POLL_INTERVAL_US, + HISI_SFC_V3XX_WAIT_TIMEOUT_US); +} + +static int hisi_sfc_v3xx_adjust_op_size(struct spi_mem *mem, + struct spi_mem_op *op) +{ + struct spi_device *spi = mem->spi; + struct hisi_sfc_v3xx_host *host; + uintptr_t addr = (uintptr_t)op->data.buf.in; + int max_byte_count; + + host = spi_controller_get_devdata(spi->master); + + max_byte_count = host->max_cmd_dword * 4; + + if (!IS_ALIGNED(addr, 4) && op->data.nbytes >= 4) + op->data.nbytes = 4 - (addr % 4); + else if (op->data.nbytes > max_byte_count) + op->data.nbytes = max_byte_count; + + return 0; +} + +/* + * The controller only supports Standard SPI mode, Duall mode and + * Quad mode. Double sanitize the ops here to avoid OOB access. + */ +static bool hisi_sfc_v3xx_supports_op(struct spi_mem *mem, + const struct spi_mem_op *op) +{ + if (op->data.buswidth > 4 || op->dummy.buswidth > 4 || + op->addr.buswidth > 4 || op->cmd.buswidth > 4) + return false; + + return spi_mem_default_supports_op(mem, op); +} + +/* + * memcpy_{to,from}io doesn't gurantee 32b accesses - which we require for the + * DATABUF registers -so use __io{read,write}32_copy when possible. For + * trailing bytes, copy them byte-by-byte from the DATABUF register, as we + * can't clobber outside the source/dest buffer. + * + * For efficient data read/write, we try to put any start 32b unaligned data + * into a separate transaction in hisi_sfc_v3xx_adjust_op_size(). + */ +static void hisi_sfc_v3xx_read_databuf(struct hisi_sfc_v3xx_host *host, + u8 *to, unsigned int len) +{ + void __iomem *from; + int i; + + from = host->regbase + HISI_SFC_V3XX_CMD_DATABUF0; + + if (IS_ALIGNED((uintptr_t)to, 4)) { + int words = len / 4; + + __ioread32_copy(to, from, words); + + len -= words * 4; + if (len) { + u32 val; + + to += words * 4; + from += words * 4; + + val = __raw_readl(from); + + for (i = 0; i < len; i++, val >>= 8, to++) + *to = (u8)val; + } + } else { + for (i = 0; i < DIV_ROUND_UP(len, 4); i++, from += 4) { + u32 val = __raw_readl(from); + int j; + + for (j = 0; j < 4 && (j + (i * 4) < len); + to++, val >>= 8, j++) + *to = (u8)val; + } + } +} + +static void hisi_sfc_v3xx_write_databuf(struct hisi_sfc_v3xx_host *host, + const u8 *from, unsigned int len) +{ + void __iomem *to; + int i; + + to = host->regbase + HISI_SFC_V3XX_CMD_DATABUF0; + + if (IS_ALIGNED((uintptr_t)from, 4)) { + int words = len / 4; + + __iowrite32_copy(to, from, words); + + len -= words * 4; + if (len) { + u32 val = 0; + + to += words * 4; + from += words * 4; + + for (i = 0; i < len; i++, from++) + val |= *from << i * 8; + __raw_writel(val, to); + } + + } else { + for (i = 0; i < DIV_ROUND_UP(len, 4); i++, to += 4) { + u32 val = 0; + int j; + + for (j = 0; j < 4 && (j + (i * 4) < len); + from++, j++) + val |= *from << j * 8; + __raw_writel(val, to); + } + } +} + +static int hisi_sfc_v3xx_start_bus(struct hisi_sfc_v3xx_host *host, + const struct spi_mem_op *op, + u8 chip_select) +{ + int len = op->data.nbytes, buswidth_mode; + u32 config = 0; + + if (op->addr.nbytes) + config |= HISI_SFC_V3XX_CMD_CFG_ADDR_EN_MSK; + + if (op->data.buswidth == 0 || op->data.buswidth == 1) { + buswidth_mode = HISI_SFC_V3XX_STD; + } else { + int data_idx, addr_idx, cmd_idx; + + data_idx = (op->data.buswidth - 1) / 2; + addr_idx = op->addr.buswidth / 2; + cmd_idx = op->cmd.buswidth / 2; + buswidth_mode = hisi_sfc_v3xx_io_modes[data_idx][addr_idx][cmd_idx]; + } + if (buswidth_mode < 0) + return buswidth_mode; + config |= buswidth_mode; + + if (op->data.dir != SPI_MEM_NO_DATA) { + config |= (len - 1) << HISI_SFC_V3XX_CMD_CFG_DATA_CNT_OFF; + config |= HISI_SFC_V3XX_CMD_CFG_DATA_EN_MSK; + } + + if (op->data.dir == SPI_MEM_DATA_IN) + config |= HISI_SFC_V3XX_CMD_CFG_RW_MSK; + + config |= op->dummy.nbytes << HISI_SFC_V3XX_CMD_CFG_DUMMY_CNT_OFF | + chip_select << HISI_SFC_V3XX_CMD_CFG_CS_SEL_OFF | + HISI_SFC_V3XX_CMD_CFG_START_MSK; + + writel(op->addr.val, host->regbase + HISI_SFC_V3XX_CMD_ADDR); + writel(op->cmd.opcode, host->regbase + HISI_SFC_V3XX_CMD_INS); + + writel(config, host->regbase + HISI_SFC_V3XX_CMD_CFG); + + return 0; +} + +static int hisi_sfc_v3xx_generic_exec_op(struct hisi_sfc_v3xx_host *host, + const struct spi_mem_op *op, + u8 chip_select) +{ + DECLARE_COMPLETION_ONSTACK(done); + int ret; + + if (host->irq) { + host->completion = &done; + hisi_sfc_v3xx_enable_int(host); + } + + if (op->data.dir == SPI_MEM_DATA_OUT) + hisi_sfc_v3xx_write_databuf(host, op->data.buf.out, op->data.nbytes); + + ret = hisi_sfc_v3xx_start_bus(host, op, chip_select); + if (ret) + return ret; + + if (host->irq) { + ret = wait_for_completion_timeout(host->completion, + usecs_to_jiffies(HISI_SFC_V3XX_WAIT_TIMEOUT_US)); + if (!ret) + ret = -ETIMEDOUT; + else + ret = 0; + + hisi_sfc_v3xx_disable_int(host); + host->completion = NULL; + } else { + ret = hisi_sfc_v3xx_wait_cmd_idle(host); + } + if (hisi_sfc_v3xx_handle_completion(host) || ret) + return -EIO; + + if (op->data.dir == SPI_MEM_DATA_IN) + hisi_sfc_v3xx_read_databuf(host, op->data.buf.in, op->data.nbytes); + + return 0; +} + +static int hisi_sfc_v3xx_exec_op(struct spi_mem *mem, + const struct spi_mem_op *op) +{ + struct hisi_sfc_v3xx_host *host; + struct spi_device *spi = mem->spi; + u8 chip_select = spi->chip_select; + + host = spi_controller_get_devdata(spi->master); + + return hisi_sfc_v3xx_generic_exec_op(host, op, chip_select); +} + +static const struct spi_controller_mem_ops hisi_sfc_v3xx_mem_ops = { + .adjust_op_size = hisi_sfc_v3xx_adjust_op_size, + .supports_op = hisi_sfc_v3xx_supports_op, + .exec_op = hisi_sfc_v3xx_exec_op, +}; + +static irqreturn_t hisi_sfc_v3xx_isr(int irq, void *data) +{ + struct hisi_sfc_v3xx_host *host = data; + + hisi_sfc_v3xx_disable_int(host); + + complete(host->completion); + + return IRQ_HANDLED; +} + +static int hisi_sfc_v3xx_buswidth_override_bits; + +/* + * ACPI FW does not allow us to currently set the device buswidth, so quirk it + * depending on the board. + */ +static int __init hisi_sfc_v3xx_dmi_quirk(const struct dmi_system_id *d) +{ + hisi_sfc_v3xx_buswidth_override_bits = SPI_RX_QUAD | SPI_TX_QUAD; + + return 0; +} + +static const struct dmi_system_id hisi_sfc_v3xx_dmi_quirk_table[] = { + { + .callback = hisi_sfc_v3xx_dmi_quirk, + .matches = { + DMI_MATCH(DMI_SYS_VENDOR, "Huawei"), + DMI_MATCH(DMI_PRODUCT_NAME, "D06"), + }, + }, + { + .callback = hisi_sfc_v3xx_dmi_quirk, + .matches = { + DMI_MATCH(DMI_SYS_VENDOR, "Huawei"), + DMI_MATCH(DMI_PRODUCT_NAME, "TaiShan 2280 V2"), + }, + }, + { + .callback = hisi_sfc_v3xx_dmi_quirk, + .matches = { + DMI_MATCH(DMI_SYS_VENDOR, "Huawei"), + DMI_MATCH(DMI_PRODUCT_NAME, "TaiShan 200 (Model 2280)"), + }, + }, + {} +}; + +static int hisi_sfc_v3xx_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct hisi_sfc_v3xx_host *host; + struct spi_controller *ctlr; + u32 version; + int ret; + + ctlr = spi_alloc_master(&pdev->dev, sizeof(*host)); + if (!ctlr) + return -ENOMEM; + + ctlr->mode_bits = SPI_RX_DUAL | SPI_RX_QUAD | + SPI_TX_DUAL | SPI_TX_QUAD; + + ctlr->buswidth_override_bits = hisi_sfc_v3xx_buswidth_override_bits; + + host = spi_controller_get_devdata(ctlr); + host->dev = dev; + + platform_set_drvdata(pdev, host); + + host->regbase = devm_platform_ioremap_resource(pdev, 0); + if (IS_ERR(host->regbase)) { + ret = PTR_ERR(host->regbase); + goto err_put_master; + } + + host->irq = platform_get_irq_optional(pdev, 0); + if (host->irq == -EPROBE_DEFER) { + ret = -EPROBE_DEFER; + goto err_put_master; + } + + hisi_sfc_v3xx_disable_int(host); + + if (host->irq > 0) { + ret = devm_request_irq(dev, host->irq, hisi_sfc_v3xx_isr, 0, + "hisi-sfc-v3xx", host); + + if (ret) { + dev_err(dev, "failed to request irq%d, ret = %d\n", host->irq, ret); + host->irq = 0; + } + } else { + host->irq = 0; + } + + ctlr->bus_num = -1; + ctlr->num_chipselect = 1; + ctlr->mem_ops = &hisi_sfc_v3xx_mem_ops; + + version = readl(host->regbase + HISI_SFC_V3XX_VERSION); + + switch (version) { + case 0x351: + host->max_cmd_dword = 64; + break; + default: + host->max_cmd_dword = 16; + break; + } + + ret = devm_spi_register_controller(dev, ctlr); + if (ret) + goto err_put_master; + + dev_info(&pdev->dev, "hw version 0x%x, %s mode.\n", + version, host->irq ? "irq" : "polling"); + + return 0; + +err_put_master: + spi_master_put(ctlr); + return ret; +} + +#if IS_ENABLED(CONFIG_ACPI) +static const struct acpi_device_id hisi_sfc_v3xx_acpi_ids[] = { + {"HISI0341", 0}, + {} +}; +MODULE_DEVICE_TABLE(acpi, hisi_sfc_v3xx_acpi_ids); +#endif + +static struct platform_driver hisi_sfc_v3xx_spi_driver = { + .driver = { + .name = "hisi-sfc-v3xx", + .acpi_match_table = ACPI_PTR(hisi_sfc_v3xx_acpi_ids), + }, + .probe = hisi_sfc_v3xx_probe, +}; + +static int __init hisi_sfc_v3xx_spi_init(void) +{ + dmi_check_system(hisi_sfc_v3xx_dmi_quirk_table); + + return platform_driver_register(&hisi_sfc_v3xx_spi_driver); +} + +static void __exit hisi_sfc_v3xx_spi_exit(void) +{ + platform_driver_unregister(&hisi_sfc_v3xx_spi_driver); +} + +module_init(hisi_sfc_v3xx_spi_init); +module_exit(hisi_sfc_v3xx_spi_exit); + +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("John Garry <john.garry@huawei.com>"); +MODULE_DESCRIPTION("HiSilicon SPI NOR V3XX Flash Controller Driver for hi16xx chipsets"); diff --git a/drivers/spi/spi-img-spfi.c b/drivers/spi/spi-img-spfi.c new file mode 100644 index 000000000..71376b6df --- /dev/null +++ b/drivers/spi/spi-img-spfi.c @@ -0,0 +1,770 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * IMG SPFI controller driver + * + * Copyright (C) 2007,2008,2013 Imagination Technologies Ltd. + * Copyright (C) 2014 Google, Inc. + */ + +#include <linux/clk.h> +#include <linux/delay.h> +#include <linux/dmaengine.h> +#include <linux/interrupt.h> +#include <linux/io.h> +#include <linux/irq.h> +#include <linux/module.h> +#include <linux/of.h> +#include <linux/platform_device.h> +#include <linux/pm_runtime.h> +#include <linux/scatterlist.h> +#include <linux/slab.h> +#include <linux/spi/spi.h> +#include <linux/spinlock.h> + +#define SPFI_DEVICE_PARAMETER(x) (0x00 + 0x4 * (x)) +#define SPFI_DEVICE_PARAMETER_BITCLK_SHIFT 24 +#define SPFI_DEVICE_PARAMETER_BITCLK_MASK 0xff +#define SPFI_DEVICE_PARAMETER_CSSETUP_SHIFT 16 +#define SPFI_DEVICE_PARAMETER_CSSETUP_MASK 0xff +#define SPFI_DEVICE_PARAMETER_CSHOLD_SHIFT 8 +#define SPFI_DEVICE_PARAMETER_CSHOLD_MASK 0xff +#define SPFI_DEVICE_PARAMETER_CSDELAY_SHIFT 0 +#define SPFI_DEVICE_PARAMETER_CSDELAY_MASK 0xff + +#define SPFI_CONTROL 0x14 +#define SPFI_CONTROL_CONTINUE BIT(12) +#define SPFI_CONTROL_SOFT_RESET BIT(11) +#define SPFI_CONTROL_SEND_DMA BIT(10) +#define SPFI_CONTROL_GET_DMA BIT(9) +#define SPFI_CONTROL_SE BIT(8) +#define SPFI_CONTROL_TMODE_SHIFT 5 +#define SPFI_CONTROL_TMODE_MASK 0x7 +#define SPFI_CONTROL_TMODE_SINGLE 0 +#define SPFI_CONTROL_TMODE_DUAL 1 +#define SPFI_CONTROL_TMODE_QUAD 2 +#define SPFI_CONTROL_SPFI_EN BIT(0) + +#define SPFI_TRANSACTION 0x18 +#define SPFI_TRANSACTION_TSIZE_SHIFT 16 +#define SPFI_TRANSACTION_TSIZE_MASK 0xffff + +#define SPFI_PORT_STATE 0x1c +#define SPFI_PORT_STATE_DEV_SEL_SHIFT 20 +#define SPFI_PORT_STATE_DEV_SEL_MASK 0x7 +#define SPFI_PORT_STATE_CK_POL(x) BIT(19 - (x)) +#define SPFI_PORT_STATE_CK_PHASE(x) BIT(14 - (x)) + +#define SPFI_TX_32BIT_VALID_DATA 0x20 +#define SPFI_TX_8BIT_VALID_DATA 0x24 +#define SPFI_RX_32BIT_VALID_DATA 0x28 +#define SPFI_RX_8BIT_VALID_DATA 0x2c + +#define SPFI_INTERRUPT_STATUS 0x30 +#define SPFI_INTERRUPT_ENABLE 0x34 +#define SPFI_INTERRUPT_CLEAR 0x38 +#define SPFI_INTERRUPT_IACCESS BIT(12) +#define SPFI_INTERRUPT_GDEX8BIT BIT(11) +#define SPFI_INTERRUPT_ALLDONETRIG BIT(9) +#define SPFI_INTERRUPT_GDFUL BIT(8) +#define SPFI_INTERRUPT_GDHF BIT(7) +#define SPFI_INTERRUPT_GDEX32BIT BIT(6) +#define SPFI_INTERRUPT_GDTRIG BIT(5) +#define SPFI_INTERRUPT_SDFUL BIT(3) +#define SPFI_INTERRUPT_SDHF BIT(2) +#define SPFI_INTERRUPT_SDE BIT(1) +#define SPFI_INTERRUPT_SDTRIG BIT(0) + +/* + * There are four parallel FIFOs of 16 bytes each. The word buffer + * (*_32BIT_VALID_DATA) accesses all four FIFOs at once, resulting in an + * effective FIFO size of 64 bytes. The byte buffer (*_8BIT_VALID_DATA) + * accesses only a single FIFO, resulting in an effective FIFO size of + * 16 bytes. + */ +#define SPFI_32BIT_FIFO_SIZE 64 +#define SPFI_8BIT_FIFO_SIZE 16 + +struct img_spfi { + struct device *dev; + struct spi_master *master; + spinlock_t lock; + + void __iomem *regs; + phys_addr_t phys; + int irq; + struct clk *spfi_clk; + struct clk *sys_clk; + + struct dma_chan *rx_ch; + struct dma_chan *tx_ch; + bool tx_dma_busy; + bool rx_dma_busy; +}; + +static inline u32 spfi_readl(struct img_spfi *spfi, u32 reg) +{ + return readl(spfi->regs + reg); +} + +static inline void spfi_writel(struct img_spfi *spfi, u32 val, u32 reg) +{ + writel(val, spfi->regs + reg); +} + +static inline void spfi_start(struct img_spfi *spfi) +{ + u32 val; + + val = spfi_readl(spfi, SPFI_CONTROL); + val |= SPFI_CONTROL_SPFI_EN; + spfi_writel(spfi, val, SPFI_CONTROL); +} + +static inline void spfi_reset(struct img_spfi *spfi) +{ + spfi_writel(spfi, SPFI_CONTROL_SOFT_RESET, SPFI_CONTROL); + spfi_writel(spfi, 0, SPFI_CONTROL); +} + +static int spfi_wait_all_done(struct img_spfi *spfi) +{ + unsigned long timeout = jiffies + msecs_to_jiffies(50); + + while (time_before(jiffies, timeout)) { + u32 status = spfi_readl(spfi, SPFI_INTERRUPT_STATUS); + + if (status & SPFI_INTERRUPT_ALLDONETRIG) { + spfi_writel(spfi, SPFI_INTERRUPT_ALLDONETRIG, + SPFI_INTERRUPT_CLEAR); + return 0; + } + cpu_relax(); + } + + dev_err(spfi->dev, "Timed out waiting for transaction to complete\n"); + spfi_reset(spfi); + + return -ETIMEDOUT; +} + +static unsigned int spfi_pio_write32(struct img_spfi *spfi, const u32 *buf, + unsigned int max) +{ + unsigned int count = 0; + u32 status; + + while (count < max / 4) { + spfi_writel(spfi, SPFI_INTERRUPT_SDFUL, SPFI_INTERRUPT_CLEAR); + status = spfi_readl(spfi, SPFI_INTERRUPT_STATUS); + if (status & SPFI_INTERRUPT_SDFUL) + break; + spfi_writel(spfi, buf[count], SPFI_TX_32BIT_VALID_DATA); + count++; + } + + return count * 4; +} + +static unsigned int spfi_pio_write8(struct img_spfi *spfi, const u8 *buf, + unsigned int max) +{ + unsigned int count = 0; + u32 status; + + while (count < max) { + spfi_writel(spfi, SPFI_INTERRUPT_SDFUL, SPFI_INTERRUPT_CLEAR); + status = spfi_readl(spfi, SPFI_INTERRUPT_STATUS); + if (status & SPFI_INTERRUPT_SDFUL) + break; + spfi_writel(spfi, buf[count], SPFI_TX_8BIT_VALID_DATA); + count++; + } + + return count; +} + +static unsigned int spfi_pio_read32(struct img_spfi *spfi, u32 *buf, + unsigned int max) +{ + unsigned int count = 0; + u32 status; + + while (count < max / 4) { + spfi_writel(spfi, SPFI_INTERRUPT_GDEX32BIT, + SPFI_INTERRUPT_CLEAR); + status = spfi_readl(spfi, SPFI_INTERRUPT_STATUS); + if (!(status & SPFI_INTERRUPT_GDEX32BIT)) + break; + buf[count] = spfi_readl(spfi, SPFI_RX_32BIT_VALID_DATA); + count++; + } + + return count * 4; +} + +static unsigned int spfi_pio_read8(struct img_spfi *spfi, u8 *buf, + unsigned int max) +{ + unsigned int count = 0; + u32 status; + + while (count < max) { + spfi_writel(spfi, SPFI_INTERRUPT_GDEX8BIT, + SPFI_INTERRUPT_CLEAR); + status = spfi_readl(spfi, SPFI_INTERRUPT_STATUS); + if (!(status & SPFI_INTERRUPT_GDEX8BIT)) + break; + buf[count] = spfi_readl(spfi, SPFI_RX_8BIT_VALID_DATA); + count++; + } + + return count; +} + +static int img_spfi_start_pio(struct spi_master *master, + struct spi_device *spi, + struct spi_transfer *xfer) +{ + struct img_spfi *spfi = spi_master_get_devdata(spi->master); + unsigned int tx_bytes = 0, rx_bytes = 0; + const void *tx_buf = xfer->tx_buf; + void *rx_buf = xfer->rx_buf; + unsigned long timeout; + int ret; + + if (tx_buf) + tx_bytes = xfer->len; + if (rx_buf) + rx_bytes = xfer->len; + + spfi_start(spfi); + + timeout = jiffies + + msecs_to_jiffies(xfer->len * 8 * 1000 / xfer->speed_hz + 100); + while ((tx_bytes > 0 || rx_bytes > 0) && + time_before(jiffies, timeout)) { + unsigned int tx_count, rx_count; + + if (tx_bytes >= 4) + tx_count = spfi_pio_write32(spfi, tx_buf, tx_bytes); + else + tx_count = spfi_pio_write8(spfi, tx_buf, tx_bytes); + + if (rx_bytes >= 4) + rx_count = spfi_pio_read32(spfi, rx_buf, rx_bytes); + else + rx_count = spfi_pio_read8(spfi, rx_buf, rx_bytes); + + tx_buf += tx_count; + rx_buf += rx_count; + tx_bytes -= tx_count; + rx_bytes -= rx_count; + + cpu_relax(); + } + + if (rx_bytes > 0 || tx_bytes > 0) { + dev_err(spfi->dev, "PIO transfer timed out\n"); + return -ETIMEDOUT; + } + + ret = spfi_wait_all_done(spfi); + if (ret < 0) + return ret; + + return 0; +} + +static void img_spfi_dma_rx_cb(void *data) +{ + struct img_spfi *spfi = data; + unsigned long flags; + + spfi_wait_all_done(spfi); + + spin_lock_irqsave(&spfi->lock, flags); + spfi->rx_dma_busy = false; + if (!spfi->tx_dma_busy) + spi_finalize_current_transfer(spfi->master); + spin_unlock_irqrestore(&spfi->lock, flags); +} + +static void img_spfi_dma_tx_cb(void *data) +{ + struct img_spfi *spfi = data; + unsigned long flags; + + spfi_wait_all_done(spfi); + + spin_lock_irqsave(&spfi->lock, flags); + spfi->tx_dma_busy = false; + if (!spfi->rx_dma_busy) + spi_finalize_current_transfer(spfi->master); + spin_unlock_irqrestore(&spfi->lock, flags); +} + +static int img_spfi_start_dma(struct spi_master *master, + struct spi_device *spi, + struct spi_transfer *xfer) +{ + struct img_spfi *spfi = spi_master_get_devdata(spi->master); + struct dma_async_tx_descriptor *rxdesc = NULL, *txdesc = NULL; + struct dma_slave_config rxconf, txconf; + + spfi->rx_dma_busy = false; + spfi->tx_dma_busy = false; + + if (xfer->rx_buf) { + rxconf.direction = DMA_DEV_TO_MEM; + if (xfer->len % 4 == 0) { + rxconf.src_addr = spfi->phys + SPFI_RX_32BIT_VALID_DATA; + rxconf.src_addr_width = 4; + rxconf.src_maxburst = 4; + } else { + rxconf.src_addr = spfi->phys + SPFI_RX_8BIT_VALID_DATA; + rxconf.src_addr_width = 1; + rxconf.src_maxburst = 4; + } + dmaengine_slave_config(spfi->rx_ch, &rxconf); + + rxdesc = dmaengine_prep_slave_sg(spfi->rx_ch, xfer->rx_sg.sgl, + xfer->rx_sg.nents, + DMA_DEV_TO_MEM, + DMA_PREP_INTERRUPT); + if (!rxdesc) + goto stop_dma; + + rxdesc->callback = img_spfi_dma_rx_cb; + rxdesc->callback_param = spfi; + } + + if (xfer->tx_buf) { + txconf.direction = DMA_MEM_TO_DEV; + if (xfer->len % 4 == 0) { + txconf.dst_addr = spfi->phys + SPFI_TX_32BIT_VALID_DATA; + txconf.dst_addr_width = 4; + txconf.dst_maxburst = 4; + } else { + txconf.dst_addr = spfi->phys + SPFI_TX_8BIT_VALID_DATA; + txconf.dst_addr_width = 1; + txconf.dst_maxburst = 4; + } + dmaengine_slave_config(spfi->tx_ch, &txconf); + + txdesc = dmaengine_prep_slave_sg(spfi->tx_ch, xfer->tx_sg.sgl, + xfer->tx_sg.nents, + DMA_MEM_TO_DEV, + DMA_PREP_INTERRUPT); + if (!txdesc) + goto stop_dma; + + txdesc->callback = img_spfi_dma_tx_cb; + txdesc->callback_param = spfi; + } + + if (xfer->rx_buf) { + spfi->rx_dma_busy = true; + dmaengine_submit(rxdesc); + dma_async_issue_pending(spfi->rx_ch); + } + + spfi_start(spfi); + + if (xfer->tx_buf) { + spfi->tx_dma_busy = true; + dmaengine_submit(txdesc); + dma_async_issue_pending(spfi->tx_ch); + } + + return 1; + +stop_dma: + dmaengine_terminate_all(spfi->rx_ch); + dmaengine_terminate_all(spfi->tx_ch); + return -EIO; +} + +static void img_spfi_handle_err(struct spi_master *master, + struct spi_message *msg) +{ + struct img_spfi *spfi = spi_master_get_devdata(master); + unsigned long flags; + + /* + * Stop all DMA and reset the controller if the previous transaction + * timed-out and never completed it's DMA. + */ + spin_lock_irqsave(&spfi->lock, flags); + if (spfi->tx_dma_busy || spfi->rx_dma_busy) { + spfi->tx_dma_busy = false; + spfi->rx_dma_busy = false; + + dmaengine_terminate_all(spfi->tx_ch); + dmaengine_terminate_all(spfi->rx_ch); + } + spin_unlock_irqrestore(&spfi->lock, flags); +} + +static int img_spfi_prepare(struct spi_master *master, struct spi_message *msg) +{ + struct img_spfi *spfi = spi_master_get_devdata(master); + u32 val; + + val = spfi_readl(spfi, SPFI_PORT_STATE); + val &= ~(SPFI_PORT_STATE_DEV_SEL_MASK << + SPFI_PORT_STATE_DEV_SEL_SHIFT); + val |= msg->spi->chip_select << SPFI_PORT_STATE_DEV_SEL_SHIFT; + if (msg->spi->mode & SPI_CPHA) + val |= SPFI_PORT_STATE_CK_PHASE(msg->spi->chip_select); + else + val &= ~SPFI_PORT_STATE_CK_PHASE(msg->spi->chip_select); + if (msg->spi->mode & SPI_CPOL) + val |= SPFI_PORT_STATE_CK_POL(msg->spi->chip_select); + else + val &= ~SPFI_PORT_STATE_CK_POL(msg->spi->chip_select); + spfi_writel(spfi, val, SPFI_PORT_STATE); + + return 0; +} + +static int img_spfi_unprepare(struct spi_master *master, + struct spi_message *msg) +{ + struct img_spfi *spfi = spi_master_get_devdata(master); + + spfi_reset(spfi); + + return 0; +} + +static void img_spfi_config(struct spi_master *master, struct spi_device *spi, + struct spi_transfer *xfer) +{ + struct img_spfi *spfi = spi_master_get_devdata(spi->master); + u32 val, div; + + /* + * output = spfi_clk * (BITCLK / 512), where BITCLK must be a + * power of 2 up to 128 + */ + div = DIV_ROUND_UP(clk_get_rate(spfi->spfi_clk), xfer->speed_hz); + div = clamp(512 / (1 << get_count_order(div)), 1, 128); + + val = spfi_readl(spfi, SPFI_DEVICE_PARAMETER(spi->chip_select)); + val &= ~(SPFI_DEVICE_PARAMETER_BITCLK_MASK << + SPFI_DEVICE_PARAMETER_BITCLK_SHIFT); + val |= div << SPFI_DEVICE_PARAMETER_BITCLK_SHIFT; + spfi_writel(spfi, val, SPFI_DEVICE_PARAMETER(spi->chip_select)); + + spfi_writel(spfi, xfer->len << SPFI_TRANSACTION_TSIZE_SHIFT, + SPFI_TRANSACTION); + + val = spfi_readl(spfi, SPFI_CONTROL); + val &= ~(SPFI_CONTROL_SEND_DMA | SPFI_CONTROL_GET_DMA); + if (xfer->tx_buf) + val |= SPFI_CONTROL_SEND_DMA; + if (xfer->rx_buf) + val |= SPFI_CONTROL_GET_DMA; + val &= ~(SPFI_CONTROL_TMODE_MASK << SPFI_CONTROL_TMODE_SHIFT); + if (xfer->tx_nbits == SPI_NBITS_DUAL && + xfer->rx_nbits == SPI_NBITS_DUAL) + val |= SPFI_CONTROL_TMODE_DUAL << SPFI_CONTROL_TMODE_SHIFT; + else if (xfer->tx_nbits == SPI_NBITS_QUAD && + xfer->rx_nbits == SPI_NBITS_QUAD) + val |= SPFI_CONTROL_TMODE_QUAD << SPFI_CONTROL_TMODE_SHIFT; + val |= SPFI_CONTROL_SE; + spfi_writel(spfi, val, SPFI_CONTROL); +} + +static int img_spfi_transfer_one(struct spi_master *master, + struct spi_device *spi, + struct spi_transfer *xfer) +{ + struct img_spfi *spfi = spi_master_get_devdata(spi->master); + int ret; + + if (xfer->len > SPFI_TRANSACTION_TSIZE_MASK) { + dev_err(spfi->dev, + "Transfer length (%d) is greater than the max supported (%d)", + xfer->len, SPFI_TRANSACTION_TSIZE_MASK); + return -EINVAL; + } + + img_spfi_config(master, spi, xfer); + if (master->can_dma && master->can_dma(master, spi, xfer)) + ret = img_spfi_start_dma(master, spi, xfer); + else + ret = img_spfi_start_pio(master, spi, xfer); + + return ret; +} + +static bool img_spfi_can_dma(struct spi_master *master, struct spi_device *spi, + struct spi_transfer *xfer) +{ + if (xfer->len > SPFI_32BIT_FIFO_SIZE) + return true; + return false; +} + +static irqreturn_t img_spfi_irq(int irq, void *dev_id) +{ + struct img_spfi *spfi = (struct img_spfi *)dev_id; + u32 status; + + status = spfi_readl(spfi, SPFI_INTERRUPT_STATUS); + if (status & SPFI_INTERRUPT_IACCESS) { + spfi_writel(spfi, SPFI_INTERRUPT_IACCESS, SPFI_INTERRUPT_CLEAR); + dev_err(spfi->dev, "Illegal access interrupt"); + return IRQ_HANDLED; + } + + return IRQ_NONE; +} + +static int img_spfi_probe(struct platform_device *pdev) +{ + struct spi_master *master; + struct img_spfi *spfi; + struct resource *res; + int ret; + u32 max_speed_hz; + + master = spi_alloc_master(&pdev->dev, sizeof(*spfi)); + if (!master) + return -ENOMEM; + platform_set_drvdata(pdev, master); + + spfi = spi_master_get_devdata(master); + spfi->dev = &pdev->dev; + spfi->master = master; + spin_lock_init(&spfi->lock); + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + spfi->regs = devm_ioremap_resource(spfi->dev, res); + if (IS_ERR(spfi->regs)) { + ret = PTR_ERR(spfi->regs); + goto put_spi; + } + spfi->phys = res->start; + + spfi->irq = platform_get_irq(pdev, 0); + if (spfi->irq < 0) { + ret = spfi->irq; + goto put_spi; + } + ret = devm_request_irq(spfi->dev, spfi->irq, img_spfi_irq, + IRQ_TYPE_LEVEL_HIGH, dev_name(spfi->dev), spfi); + if (ret) + goto put_spi; + + spfi->sys_clk = devm_clk_get(spfi->dev, "sys"); + if (IS_ERR(spfi->sys_clk)) { + ret = PTR_ERR(spfi->sys_clk); + goto put_spi; + } + spfi->spfi_clk = devm_clk_get(spfi->dev, "spfi"); + if (IS_ERR(spfi->spfi_clk)) { + ret = PTR_ERR(spfi->spfi_clk); + goto put_spi; + } + + ret = clk_prepare_enable(spfi->sys_clk); + if (ret) + goto put_spi; + ret = clk_prepare_enable(spfi->spfi_clk); + if (ret) + goto disable_pclk; + + spfi_reset(spfi); + /* + * Only enable the error (IACCESS) interrupt. In PIO mode we'll + * poll the status of the FIFOs. + */ + spfi_writel(spfi, SPFI_INTERRUPT_IACCESS, SPFI_INTERRUPT_ENABLE); + + master->auto_runtime_pm = true; + master->bus_num = pdev->id; + master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_TX_DUAL | SPI_RX_DUAL; + if (of_property_read_bool(spfi->dev->of_node, "img,supports-quad-mode")) + master->mode_bits |= SPI_TX_QUAD | SPI_RX_QUAD; + master->dev.of_node = pdev->dev.of_node; + master->bits_per_word_mask = SPI_BPW_MASK(32) | SPI_BPW_MASK(8); + master->max_speed_hz = clk_get_rate(spfi->spfi_clk) / 4; + master->min_speed_hz = clk_get_rate(spfi->spfi_clk) / 512; + + /* + * Maximum speed supported by spfi is limited to the lower value + * between 1/4 of the SPFI clock or to "spfi-max-frequency" + * defined in the device tree. + * If no value is defined in the device tree assume the maximum + * speed supported to be 1/4 of the SPFI clock. + */ + if (!of_property_read_u32(spfi->dev->of_node, "spfi-max-frequency", + &max_speed_hz)) { + if (master->max_speed_hz > max_speed_hz) + master->max_speed_hz = max_speed_hz; + } + + master->transfer_one = img_spfi_transfer_one; + master->prepare_message = img_spfi_prepare; + master->unprepare_message = img_spfi_unprepare; + master->handle_err = img_spfi_handle_err; + master->use_gpio_descriptors = true; + + spfi->tx_ch = dma_request_chan(spfi->dev, "tx"); + if (IS_ERR(spfi->tx_ch)) { + ret = PTR_ERR(spfi->tx_ch); + spfi->tx_ch = NULL; + if (ret == -EPROBE_DEFER) + goto disable_pm; + } + + spfi->rx_ch = dma_request_chan(spfi->dev, "rx"); + if (IS_ERR(spfi->rx_ch)) { + ret = PTR_ERR(spfi->rx_ch); + spfi->rx_ch = NULL; + if (ret == -EPROBE_DEFER) + goto disable_pm; + } + + if (!spfi->tx_ch || !spfi->rx_ch) { + if (spfi->tx_ch) + dma_release_channel(spfi->tx_ch); + if (spfi->rx_ch) + dma_release_channel(spfi->rx_ch); + spfi->tx_ch = NULL; + spfi->rx_ch = NULL; + dev_warn(spfi->dev, "Failed to get DMA channels, falling back to PIO mode\n"); + } else { + master->dma_tx = spfi->tx_ch; + master->dma_rx = spfi->rx_ch; + master->can_dma = img_spfi_can_dma; + } + + pm_runtime_set_active(spfi->dev); + pm_runtime_enable(spfi->dev); + + ret = devm_spi_register_master(spfi->dev, master); + if (ret) + goto disable_pm; + + return 0; + +disable_pm: + pm_runtime_disable(spfi->dev); + if (spfi->rx_ch) + dma_release_channel(spfi->rx_ch); + if (spfi->tx_ch) + dma_release_channel(spfi->tx_ch); + clk_disable_unprepare(spfi->spfi_clk); +disable_pclk: + clk_disable_unprepare(spfi->sys_clk); +put_spi: + spi_master_put(master); + + return ret; +} + +static int img_spfi_remove(struct platform_device *pdev) +{ + struct spi_master *master = platform_get_drvdata(pdev); + struct img_spfi *spfi = spi_master_get_devdata(master); + + if (spfi->tx_ch) + dma_release_channel(spfi->tx_ch); + if (spfi->rx_ch) + dma_release_channel(spfi->rx_ch); + + pm_runtime_disable(spfi->dev); + if (!pm_runtime_status_suspended(spfi->dev)) { + clk_disable_unprepare(spfi->spfi_clk); + clk_disable_unprepare(spfi->sys_clk); + } + + return 0; +} + +#ifdef CONFIG_PM +static int img_spfi_runtime_suspend(struct device *dev) +{ + struct spi_master *master = dev_get_drvdata(dev); + struct img_spfi *spfi = spi_master_get_devdata(master); + + clk_disable_unprepare(spfi->spfi_clk); + clk_disable_unprepare(spfi->sys_clk); + + return 0; +} + +static int img_spfi_runtime_resume(struct device *dev) +{ + struct spi_master *master = dev_get_drvdata(dev); + struct img_spfi *spfi = spi_master_get_devdata(master); + int ret; + + ret = clk_prepare_enable(spfi->sys_clk); + if (ret) + return ret; + ret = clk_prepare_enable(spfi->spfi_clk); + if (ret) { + clk_disable_unprepare(spfi->sys_clk); + return ret; + } + + return 0; +} +#endif /* CONFIG_PM */ + +#ifdef CONFIG_PM_SLEEP +static int img_spfi_suspend(struct device *dev) +{ + struct spi_master *master = dev_get_drvdata(dev); + + return spi_master_suspend(master); +} + +static int img_spfi_resume(struct device *dev) +{ + struct spi_master *master = dev_get_drvdata(dev); + struct img_spfi *spfi = spi_master_get_devdata(master); + int ret; + + ret = pm_runtime_get_sync(dev); + if (ret < 0) { + pm_runtime_put_noidle(dev); + return ret; + } + spfi_reset(spfi); + pm_runtime_put(dev); + + return spi_master_resume(master); +} +#endif /* CONFIG_PM_SLEEP */ + +static const struct dev_pm_ops img_spfi_pm_ops = { + SET_RUNTIME_PM_OPS(img_spfi_runtime_suspend, img_spfi_runtime_resume, + NULL) + SET_SYSTEM_SLEEP_PM_OPS(img_spfi_suspend, img_spfi_resume) +}; + +static const struct of_device_id img_spfi_of_match[] = { + { .compatible = "img,spfi", }, + { }, +}; +MODULE_DEVICE_TABLE(of, img_spfi_of_match); + +static struct platform_driver img_spfi_driver = { + .driver = { + .name = "img-spfi", + .pm = &img_spfi_pm_ops, + .of_match_table = of_match_ptr(img_spfi_of_match), + }, + .probe = img_spfi_probe, + .remove = img_spfi_remove, +}; +module_platform_driver(img_spfi_driver); + +MODULE_DESCRIPTION("IMG SPFI controller driver"); +MODULE_AUTHOR("Andrew Bresticker <abrestic@chromium.org>"); +MODULE_LICENSE("GPL v2"); diff --git a/drivers/spi/spi-imx.c b/drivers/spi/spi-imx.c new file mode 100644 index 000000000..21297cc62 --- /dev/null +++ b/drivers/spi/spi-imx.c @@ -0,0 +1,1862 @@ +// SPDX-License-Identifier: GPL-2.0+ +// Copyright 2004-2007 Freescale Semiconductor, Inc. All Rights Reserved. +// Copyright (C) 2008 Juergen Beisert + +#include <linux/clk.h> +#include <linux/completion.h> +#include <linux/delay.h> +#include <linux/dmaengine.h> +#include <linux/dma-mapping.h> +#include <linux/err.h> +#include <linux/interrupt.h> +#include <linux/io.h> +#include <linux/irq.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/pinctrl/consumer.h> +#include <linux/platform_device.h> +#include <linux/pm_runtime.h> +#include <linux/slab.h> +#include <linux/spi/spi.h> +#include <linux/spi/spi_bitbang.h> +#include <linux/types.h> +#include <linux/of.h> +#include <linux/of_device.h> +#include <linux/property.h> + +#include <linux/platform_data/dma-imx.h> + +#define DRIVER_NAME "spi_imx" + +static bool use_dma = true; +module_param(use_dma, bool, 0644); +MODULE_PARM_DESC(use_dma, "Enable usage of DMA when available (default)"); + +#define MXC_RPM_TIMEOUT 2000 /* 2000ms */ + +#define MXC_CSPIRXDATA 0x00 +#define MXC_CSPITXDATA 0x04 +#define MXC_CSPICTRL 0x08 +#define MXC_CSPIINT 0x0c +#define MXC_RESET 0x1c + +/* generic defines to abstract from the different register layouts */ +#define MXC_INT_RR (1 << 0) /* Receive data ready interrupt */ +#define MXC_INT_TE (1 << 1) /* Transmit FIFO empty interrupt */ +#define MXC_INT_RDR BIT(4) /* Receive date threshold interrupt */ + +/* The maximum bytes that a sdma BD can transfer. */ +#define MAX_SDMA_BD_BYTES (1 << 15) +#define MX51_ECSPI_CTRL_MAX_BURST 512 +/* The maximum bytes that IMX53_ECSPI can transfer in slave mode.*/ +#define MX53_MAX_TRANSFER_BYTES 512 + +enum spi_imx_devtype { + IMX1_CSPI, + IMX21_CSPI, + IMX27_CSPI, + IMX31_CSPI, + IMX35_CSPI, /* CSPI on all i.mx except above */ + IMX51_ECSPI, /* ECSPI on i.mx51 */ + IMX53_ECSPI, /* ECSPI on i.mx53 and later */ +}; + +struct spi_imx_data; + +struct spi_imx_devtype_data { + void (*intctrl)(struct spi_imx_data *, int); + int (*prepare_message)(struct spi_imx_data *, struct spi_message *); + int (*prepare_transfer)(struct spi_imx_data *, struct spi_device *); + void (*trigger)(struct spi_imx_data *); + int (*rx_available)(struct spi_imx_data *); + void (*reset)(struct spi_imx_data *); + void (*setup_wml)(struct spi_imx_data *); + void (*disable)(struct spi_imx_data *); + void (*disable_dma)(struct spi_imx_data *); + bool has_dmamode; + bool has_slavemode; + unsigned int fifo_size; + bool dynamic_burst; + enum spi_imx_devtype devtype; +}; + +struct spi_imx_data { + struct spi_bitbang bitbang; + struct device *dev; + + struct completion xfer_done; + void __iomem *base; + unsigned long base_phys; + + struct clk *clk_per; + struct clk *clk_ipg; + unsigned long spi_clk; + unsigned int spi_bus_clk; + + unsigned int bits_per_word; + unsigned int spi_drctl; + + unsigned int count, remainder; + void (*tx)(struct spi_imx_data *); + void (*rx)(struct spi_imx_data *); + void *rx_buf; + const void *tx_buf; + unsigned int txfifo; /* number of words pushed in tx FIFO */ + unsigned int dynamic_burst; + + /* Slave mode */ + bool slave_mode; + bool slave_aborted; + unsigned int slave_burst; + + /* DMA */ + bool usedma; + u32 wml; + struct completion dma_rx_completion; + struct completion dma_tx_completion; + + const struct spi_imx_devtype_data *devtype_data; +}; + +static inline int is_imx27_cspi(struct spi_imx_data *d) +{ + return d->devtype_data->devtype == IMX27_CSPI; +} + +static inline int is_imx35_cspi(struct spi_imx_data *d) +{ + return d->devtype_data->devtype == IMX35_CSPI; +} + +static inline int is_imx51_ecspi(struct spi_imx_data *d) +{ + return d->devtype_data->devtype == IMX51_ECSPI; +} + +static inline int is_imx53_ecspi(struct spi_imx_data *d) +{ + return d->devtype_data->devtype == IMX53_ECSPI; +} + +#define MXC_SPI_BUF_RX(type) \ +static void spi_imx_buf_rx_##type(struct spi_imx_data *spi_imx) \ +{ \ + unsigned int val = readl(spi_imx->base + MXC_CSPIRXDATA); \ + \ + if (spi_imx->rx_buf) { \ + *(type *)spi_imx->rx_buf = val; \ + spi_imx->rx_buf += sizeof(type); \ + } \ + \ + spi_imx->remainder -= sizeof(type); \ +} + +#define MXC_SPI_BUF_TX(type) \ +static void spi_imx_buf_tx_##type(struct spi_imx_data *spi_imx) \ +{ \ + type val = 0; \ + \ + if (spi_imx->tx_buf) { \ + val = *(type *)spi_imx->tx_buf; \ + spi_imx->tx_buf += sizeof(type); \ + } \ + \ + spi_imx->count -= sizeof(type); \ + \ + writel(val, spi_imx->base + MXC_CSPITXDATA); \ +} + +MXC_SPI_BUF_RX(u8) +MXC_SPI_BUF_TX(u8) +MXC_SPI_BUF_RX(u16) +MXC_SPI_BUF_TX(u16) +MXC_SPI_BUF_RX(u32) +MXC_SPI_BUF_TX(u32) + +/* First entry is reserved, second entry is valid only if SDHC_SPIEN is set + * (which is currently not the case in this driver) + */ +static int mxc_clkdivs[] = {0, 3, 4, 6, 8, 12, 16, 24, 32, 48, 64, 96, 128, 192, + 256, 384, 512, 768, 1024}; + +/* MX21, MX27 */ +static unsigned int spi_imx_clkdiv_1(unsigned int fin, + unsigned int fspi, unsigned int max, unsigned int *fres) +{ + int i; + + for (i = 2; i < max; i++) + if (fspi * mxc_clkdivs[i] >= fin) + break; + + *fres = fin / mxc_clkdivs[i]; + return i; +} + +/* MX1, MX31, MX35, MX51 CSPI */ +static unsigned int spi_imx_clkdiv_2(unsigned int fin, + unsigned int fspi, unsigned int *fres) +{ + int i, div = 4; + + for (i = 0; i < 7; i++) { + if (fspi * div >= fin) + goto out; + div <<= 1; + } + +out: + *fres = fin / div; + return i; +} + +static int spi_imx_bytes_per_word(const int bits_per_word) +{ + if (bits_per_word <= 8) + return 1; + else if (bits_per_word <= 16) + return 2; + else + return 4; +} + +static bool spi_imx_can_dma(struct spi_master *master, struct spi_device *spi, + struct spi_transfer *transfer) +{ + struct spi_imx_data *spi_imx = spi_master_get_devdata(master); + + if (!use_dma || master->fallback) + return false; + + if (!master->dma_rx) + return false; + + if (spi_imx->slave_mode) + return false; + + if (transfer->len < spi_imx->devtype_data->fifo_size) + return false; + + spi_imx->dynamic_burst = 0; + + return true; +} + +/* + * Note the number of natively supported chip selects for MX51 is 4. Some + * devices may have less actual SS pins but the register map supports 4. When + * using gpio chip selects the cs values passed into the macros below can go + * outside the range 0 - 3. We therefore need to limit the cs value to avoid + * corrupting bits outside the allocated locations. + * + * The simplest way to do this is to just mask the cs bits to 2 bits. This + * still allows all 4 native chip selects to work as well as gpio chip selects + * (which can use any of the 4 chip select configurations). + */ + +#define MX51_ECSPI_CTRL 0x08 +#define MX51_ECSPI_CTRL_ENABLE (1 << 0) +#define MX51_ECSPI_CTRL_XCH (1 << 2) +#define MX51_ECSPI_CTRL_SMC (1 << 3) +#define MX51_ECSPI_CTRL_MODE_MASK (0xf << 4) +#define MX51_ECSPI_CTRL_DRCTL(drctl) ((drctl) << 16) +#define MX51_ECSPI_CTRL_POSTDIV_OFFSET 8 +#define MX51_ECSPI_CTRL_PREDIV_OFFSET 12 +#define MX51_ECSPI_CTRL_CS(cs) ((cs & 3) << 18) +#define MX51_ECSPI_CTRL_BL_OFFSET 20 +#define MX51_ECSPI_CTRL_BL_MASK (0xfff << 20) + +#define MX51_ECSPI_CONFIG 0x0c +#define MX51_ECSPI_CONFIG_SCLKPHA(cs) (1 << ((cs & 3) + 0)) +#define MX51_ECSPI_CONFIG_SCLKPOL(cs) (1 << ((cs & 3) + 4)) +#define MX51_ECSPI_CONFIG_SBBCTRL(cs) (1 << ((cs & 3) + 8)) +#define MX51_ECSPI_CONFIG_SSBPOL(cs) (1 << ((cs & 3) + 12)) +#define MX51_ECSPI_CONFIG_SCLKCTL(cs) (1 << ((cs & 3) + 20)) + +#define MX51_ECSPI_INT 0x10 +#define MX51_ECSPI_INT_TEEN (1 << 0) +#define MX51_ECSPI_INT_RREN (1 << 3) +#define MX51_ECSPI_INT_RDREN (1 << 4) + +#define MX51_ECSPI_DMA 0x14 +#define MX51_ECSPI_DMA_TX_WML(wml) ((wml) & 0x3f) +#define MX51_ECSPI_DMA_RX_WML(wml) (((wml) & 0x3f) << 16) +#define MX51_ECSPI_DMA_RXT_WML(wml) (((wml) & 0x3f) << 24) + +#define MX51_ECSPI_DMA_TEDEN (1 << 7) +#define MX51_ECSPI_DMA_RXDEN (1 << 23) +#define MX51_ECSPI_DMA_RXTDEN (1 << 31) + +#define MX51_ECSPI_STAT 0x18 +#define MX51_ECSPI_STAT_RR (1 << 3) + +#define MX51_ECSPI_TESTREG 0x20 +#define MX51_ECSPI_TESTREG_LBC BIT(31) + +static void spi_imx_buf_rx_swap_u32(struct spi_imx_data *spi_imx) +{ + unsigned int val = readl(spi_imx->base + MXC_CSPIRXDATA); +#ifdef __LITTLE_ENDIAN + unsigned int bytes_per_word; +#endif + + if (spi_imx->rx_buf) { +#ifdef __LITTLE_ENDIAN + bytes_per_word = spi_imx_bytes_per_word(spi_imx->bits_per_word); + if (bytes_per_word == 1) + val = cpu_to_be32(val); + else if (bytes_per_word == 2) + val = (val << 16) | (val >> 16); +#endif + *(u32 *)spi_imx->rx_buf = val; + spi_imx->rx_buf += sizeof(u32); + } + + spi_imx->remainder -= sizeof(u32); +} + +static void spi_imx_buf_rx_swap(struct spi_imx_data *spi_imx) +{ + int unaligned; + u32 val; + + unaligned = spi_imx->remainder % 4; + + if (!unaligned) { + spi_imx_buf_rx_swap_u32(spi_imx); + return; + } + + if (spi_imx_bytes_per_word(spi_imx->bits_per_word) == 2) { + spi_imx_buf_rx_u16(spi_imx); + return; + } + + val = readl(spi_imx->base + MXC_CSPIRXDATA); + + while (unaligned--) { + if (spi_imx->rx_buf) { + *(u8 *)spi_imx->rx_buf = (val >> (8 * unaligned)) & 0xff; + spi_imx->rx_buf++; + } + spi_imx->remainder--; + } +} + +static void spi_imx_buf_tx_swap_u32(struct spi_imx_data *spi_imx) +{ + u32 val = 0; +#ifdef __LITTLE_ENDIAN + unsigned int bytes_per_word; +#endif + + if (spi_imx->tx_buf) { + val = *(u32 *)spi_imx->tx_buf; + spi_imx->tx_buf += sizeof(u32); + } + + spi_imx->count -= sizeof(u32); +#ifdef __LITTLE_ENDIAN + bytes_per_word = spi_imx_bytes_per_word(spi_imx->bits_per_word); + + if (bytes_per_word == 1) + val = cpu_to_be32(val); + else if (bytes_per_word == 2) + val = (val << 16) | (val >> 16); +#endif + writel(val, spi_imx->base + MXC_CSPITXDATA); +} + +static void spi_imx_buf_tx_swap(struct spi_imx_data *spi_imx) +{ + int unaligned; + u32 val = 0; + + unaligned = spi_imx->count % 4; + + if (!unaligned) { + spi_imx_buf_tx_swap_u32(spi_imx); + return; + } + + if (spi_imx_bytes_per_word(spi_imx->bits_per_word) == 2) { + spi_imx_buf_tx_u16(spi_imx); + return; + } + + while (unaligned--) { + if (spi_imx->tx_buf) { + val |= *(u8 *)spi_imx->tx_buf << (8 * unaligned); + spi_imx->tx_buf++; + } + spi_imx->count--; + } + + writel(val, spi_imx->base + MXC_CSPITXDATA); +} + +static void mx53_ecspi_rx_slave(struct spi_imx_data *spi_imx) +{ + u32 val = be32_to_cpu(readl(spi_imx->base + MXC_CSPIRXDATA)); + + if (spi_imx->rx_buf) { + int n_bytes = spi_imx->slave_burst % sizeof(val); + + if (!n_bytes) + n_bytes = sizeof(val); + + memcpy(spi_imx->rx_buf, + ((u8 *)&val) + sizeof(val) - n_bytes, n_bytes); + + spi_imx->rx_buf += n_bytes; + spi_imx->slave_burst -= n_bytes; + } + + spi_imx->remainder -= sizeof(u32); +} + +static void mx53_ecspi_tx_slave(struct spi_imx_data *spi_imx) +{ + u32 val = 0; + int n_bytes = spi_imx->count % sizeof(val); + + if (!n_bytes) + n_bytes = sizeof(val); + + if (spi_imx->tx_buf) { + memcpy(((u8 *)&val) + sizeof(val) - n_bytes, + spi_imx->tx_buf, n_bytes); + val = cpu_to_be32(val); + spi_imx->tx_buf += n_bytes; + } + + spi_imx->count -= n_bytes; + + writel(val, spi_imx->base + MXC_CSPITXDATA); +} + +/* MX51 eCSPI */ +static unsigned int mx51_ecspi_clkdiv(struct spi_imx_data *spi_imx, + unsigned int fspi, unsigned int *fres) +{ + /* + * there are two 4-bit dividers, the pre-divider divides by + * $pre, the post-divider by 2^$post + */ + unsigned int pre, post; + unsigned int fin = spi_imx->spi_clk; + + fspi = min(fspi, fin); + + post = fls(fin) - fls(fspi); + if (fin > fspi << post) + post++; + + /* now we have: (fin <= fspi << post) with post being minimal */ + + post = max(4U, post) - 4; + if (unlikely(post > 0xf)) { + dev_err(spi_imx->dev, "cannot set clock freq: %u (base freq: %u)\n", + fspi, fin); + return 0xff; + } + + pre = DIV_ROUND_UP(fin, fspi << post) - 1; + + dev_dbg(spi_imx->dev, "%s: fin: %u, fspi: %u, post: %u, pre: %u\n", + __func__, fin, fspi, post, pre); + + /* Resulting frequency for the SCLK line. */ + *fres = (fin / (pre + 1)) >> post; + + return (pre << MX51_ECSPI_CTRL_PREDIV_OFFSET) | + (post << MX51_ECSPI_CTRL_POSTDIV_OFFSET); +} + +static void mx51_ecspi_intctrl(struct spi_imx_data *spi_imx, int enable) +{ + unsigned val = 0; + + if (enable & MXC_INT_TE) + val |= MX51_ECSPI_INT_TEEN; + + if (enable & MXC_INT_RR) + val |= MX51_ECSPI_INT_RREN; + + if (enable & MXC_INT_RDR) + val |= MX51_ECSPI_INT_RDREN; + + writel(val, spi_imx->base + MX51_ECSPI_INT); +} + +static void mx51_ecspi_trigger(struct spi_imx_data *spi_imx) +{ + u32 reg; + + reg = readl(spi_imx->base + MX51_ECSPI_CTRL); + reg |= MX51_ECSPI_CTRL_XCH; + writel(reg, spi_imx->base + MX51_ECSPI_CTRL); +} + +static void mx51_disable_dma(struct spi_imx_data *spi_imx) +{ + writel(0, spi_imx->base + MX51_ECSPI_DMA); +} + +static void mx51_ecspi_disable(struct spi_imx_data *spi_imx) +{ + u32 ctrl; + + ctrl = readl(spi_imx->base + MX51_ECSPI_CTRL); + ctrl &= ~MX51_ECSPI_CTRL_ENABLE; + writel(ctrl, spi_imx->base + MX51_ECSPI_CTRL); +} + +static int mx51_ecspi_prepare_message(struct spi_imx_data *spi_imx, + struct spi_message *msg) +{ + struct spi_device *spi = msg->spi; + struct spi_transfer *xfer; + u32 ctrl = MX51_ECSPI_CTRL_ENABLE; + u32 min_speed_hz = ~0U; + u32 testreg, delay; + u32 cfg = readl(spi_imx->base + MX51_ECSPI_CONFIG); + + /* set Master or Slave mode */ + if (spi_imx->slave_mode) + ctrl &= ~MX51_ECSPI_CTRL_MODE_MASK; + else + ctrl |= MX51_ECSPI_CTRL_MODE_MASK; + + /* + * Enable SPI_RDY handling (falling edge/level triggered). + */ + if (spi->mode & SPI_READY) + ctrl |= MX51_ECSPI_CTRL_DRCTL(spi_imx->spi_drctl); + + /* set chip select to use */ + ctrl |= MX51_ECSPI_CTRL_CS(spi->chip_select); + + /* + * The ctrl register must be written first, with the EN bit set other + * registers must not be written to. + */ + writel(ctrl, spi_imx->base + MX51_ECSPI_CTRL); + + testreg = readl(spi_imx->base + MX51_ECSPI_TESTREG); + if (spi->mode & SPI_LOOP) + testreg |= MX51_ECSPI_TESTREG_LBC; + else + testreg &= ~MX51_ECSPI_TESTREG_LBC; + writel(testreg, spi_imx->base + MX51_ECSPI_TESTREG); + + /* + * eCSPI burst completion by Chip Select signal in Slave mode + * is not functional for imx53 Soc, config SPI burst completed when + * BURST_LENGTH + 1 bits are received + */ + if (spi_imx->slave_mode && is_imx53_ecspi(spi_imx)) + cfg &= ~MX51_ECSPI_CONFIG_SBBCTRL(spi->chip_select); + else + cfg |= MX51_ECSPI_CONFIG_SBBCTRL(spi->chip_select); + + if (spi->mode & SPI_CPHA) + cfg |= MX51_ECSPI_CONFIG_SCLKPHA(spi->chip_select); + else + cfg &= ~MX51_ECSPI_CONFIG_SCLKPHA(spi->chip_select); + + if (spi->mode & SPI_CPOL) { + cfg |= MX51_ECSPI_CONFIG_SCLKPOL(spi->chip_select); + cfg |= MX51_ECSPI_CONFIG_SCLKCTL(spi->chip_select); + } else { + cfg &= ~MX51_ECSPI_CONFIG_SCLKPOL(spi->chip_select); + cfg &= ~MX51_ECSPI_CONFIG_SCLKCTL(spi->chip_select); + } + + if (spi->mode & SPI_CS_HIGH) + cfg |= MX51_ECSPI_CONFIG_SSBPOL(spi->chip_select); + else + cfg &= ~MX51_ECSPI_CONFIG_SSBPOL(spi->chip_select); + + writel(cfg, spi_imx->base + MX51_ECSPI_CONFIG); + + /* + * Wait until the changes in the configuration register CONFIGREG + * propagate into the hardware. It takes exactly one tick of the + * SCLK clock, but we will wait two SCLK clock just to be sure. The + * effect of the delay it takes for the hardware to apply changes + * is noticable if the SCLK clock run very slow. In such a case, if + * the polarity of SCLK should be inverted, the GPIO ChipSelect might + * be asserted before the SCLK polarity changes, which would disrupt + * the SPI communication as the device on the other end would consider + * the change of SCLK polarity as a clock tick already. + * + * Because spi_imx->spi_bus_clk is only set in bitbang prepare_message + * callback, iterate over all the transfers in spi_message, find the + * one with lowest bus frequency, and use that bus frequency for the + * delay calculation. In case all transfers have speed_hz == 0, then + * min_speed_hz is ~0 and the resulting delay is zero. + */ + list_for_each_entry(xfer, &msg->transfers, transfer_list) { + if (!xfer->speed_hz) + continue; + min_speed_hz = min(xfer->speed_hz, min_speed_hz); + } + + delay = (2 * 1000000) / min_speed_hz; + if (likely(delay < 10)) /* SCLK is faster than 100 kHz */ + udelay(delay); + else /* SCLK is _very_ slow */ + usleep_range(delay, delay + 10); + + return 0; +} + +static int mx51_ecspi_prepare_transfer(struct spi_imx_data *spi_imx, + struct spi_device *spi) +{ + u32 ctrl = readl(spi_imx->base + MX51_ECSPI_CTRL); + u32 clk; + + /* Clear BL field and set the right value */ + ctrl &= ~MX51_ECSPI_CTRL_BL_MASK; + if (spi_imx->slave_mode && is_imx53_ecspi(spi_imx)) + ctrl |= (spi_imx->slave_burst * 8 - 1) + << MX51_ECSPI_CTRL_BL_OFFSET; + else + ctrl |= (spi_imx->bits_per_word - 1) + << MX51_ECSPI_CTRL_BL_OFFSET; + + /* set clock speed */ + ctrl &= ~(0xf << MX51_ECSPI_CTRL_POSTDIV_OFFSET | + 0xf << MX51_ECSPI_CTRL_PREDIV_OFFSET); + ctrl |= mx51_ecspi_clkdiv(spi_imx, spi_imx->spi_bus_clk, &clk); + spi_imx->spi_bus_clk = clk; + + if (spi_imx->usedma) + ctrl |= MX51_ECSPI_CTRL_SMC; + + writel(ctrl, spi_imx->base + MX51_ECSPI_CTRL); + + return 0; +} + +static void mx51_setup_wml(struct spi_imx_data *spi_imx) +{ + /* + * Configure the DMA register: setup the watermark + * and enable DMA request. + */ + writel(MX51_ECSPI_DMA_RX_WML(spi_imx->wml - 1) | + MX51_ECSPI_DMA_TX_WML(spi_imx->wml) | + MX51_ECSPI_DMA_RXT_WML(spi_imx->wml) | + MX51_ECSPI_DMA_TEDEN | MX51_ECSPI_DMA_RXDEN | + MX51_ECSPI_DMA_RXTDEN, spi_imx->base + MX51_ECSPI_DMA); +} + +static int mx51_ecspi_rx_available(struct spi_imx_data *spi_imx) +{ + return readl(spi_imx->base + MX51_ECSPI_STAT) & MX51_ECSPI_STAT_RR; +} + +static void mx51_ecspi_reset(struct spi_imx_data *spi_imx) +{ + /* drain receive buffer */ + while (mx51_ecspi_rx_available(spi_imx)) + readl(spi_imx->base + MXC_CSPIRXDATA); +} + +#define MX31_INTREG_TEEN (1 << 0) +#define MX31_INTREG_RREN (1 << 3) + +#define MX31_CSPICTRL_ENABLE (1 << 0) +#define MX31_CSPICTRL_MASTER (1 << 1) +#define MX31_CSPICTRL_XCH (1 << 2) +#define MX31_CSPICTRL_SMC (1 << 3) +#define MX31_CSPICTRL_POL (1 << 4) +#define MX31_CSPICTRL_PHA (1 << 5) +#define MX31_CSPICTRL_SSCTL (1 << 6) +#define MX31_CSPICTRL_SSPOL (1 << 7) +#define MX31_CSPICTRL_BC_SHIFT 8 +#define MX35_CSPICTRL_BL_SHIFT 20 +#define MX31_CSPICTRL_CS_SHIFT 24 +#define MX35_CSPICTRL_CS_SHIFT 12 +#define MX31_CSPICTRL_DR_SHIFT 16 + +#define MX31_CSPI_DMAREG 0x10 +#define MX31_DMAREG_RH_DEN (1<<4) +#define MX31_DMAREG_TH_DEN (1<<1) + +#define MX31_CSPISTATUS 0x14 +#define MX31_STATUS_RR (1 << 3) + +#define MX31_CSPI_TESTREG 0x1C +#define MX31_TEST_LBC (1 << 14) + +/* These functions also work for the i.MX35, but be aware that + * the i.MX35 has a slightly different register layout for bits + * we do not use here. + */ +static void mx31_intctrl(struct spi_imx_data *spi_imx, int enable) +{ + unsigned int val = 0; + + if (enable & MXC_INT_TE) + val |= MX31_INTREG_TEEN; + if (enable & MXC_INT_RR) + val |= MX31_INTREG_RREN; + + writel(val, spi_imx->base + MXC_CSPIINT); +} + +static void mx31_trigger(struct spi_imx_data *spi_imx) +{ + unsigned int reg; + + reg = readl(spi_imx->base + MXC_CSPICTRL); + reg |= MX31_CSPICTRL_XCH; + writel(reg, spi_imx->base + MXC_CSPICTRL); +} + +static int mx31_prepare_message(struct spi_imx_data *spi_imx, + struct spi_message *msg) +{ + return 0; +} + +static int mx31_prepare_transfer(struct spi_imx_data *spi_imx, + struct spi_device *spi) +{ + unsigned int reg = MX31_CSPICTRL_ENABLE | MX31_CSPICTRL_MASTER; + unsigned int clk; + + reg |= spi_imx_clkdiv_2(spi_imx->spi_clk, spi_imx->spi_bus_clk, &clk) << + MX31_CSPICTRL_DR_SHIFT; + spi_imx->spi_bus_clk = clk; + + if (is_imx35_cspi(spi_imx)) { + reg |= (spi_imx->bits_per_word - 1) << MX35_CSPICTRL_BL_SHIFT; + reg |= MX31_CSPICTRL_SSCTL; + } else { + reg |= (spi_imx->bits_per_word - 1) << MX31_CSPICTRL_BC_SHIFT; + } + + if (spi->mode & SPI_CPHA) + reg |= MX31_CSPICTRL_PHA; + if (spi->mode & SPI_CPOL) + reg |= MX31_CSPICTRL_POL; + if (spi->mode & SPI_CS_HIGH) + reg |= MX31_CSPICTRL_SSPOL; + if (!spi->cs_gpiod) + reg |= (spi->chip_select) << + (is_imx35_cspi(spi_imx) ? MX35_CSPICTRL_CS_SHIFT : + MX31_CSPICTRL_CS_SHIFT); + + if (spi_imx->usedma) + reg |= MX31_CSPICTRL_SMC; + + writel(reg, spi_imx->base + MXC_CSPICTRL); + + reg = readl(spi_imx->base + MX31_CSPI_TESTREG); + if (spi->mode & SPI_LOOP) + reg |= MX31_TEST_LBC; + else + reg &= ~MX31_TEST_LBC; + writel(reg, spi_imx->base + MX31_CSPI_TESTREG); + + if (spi_imx->usedma) { + /* + * configure DMA requests when RXFIFO is half full and + * when TXFIFO is half empty + */ + writel(MX31_DMAREG_RH_DEN | MX31_DMAREG_TH_DEN, + spi_imx->base + MX31_CSPI_DMAREG); + } + + return 0; +} + +static int mx31_rx_available(struct spi_imx_data *spi_imx) +{ + return readl(spi_imx->base + MX31_CSPISTATUS) & MX31_STATUS_RR; +} + +static void mx31_reset(struct spi_imx_data *spi_imx) +{ + /* drain receive buffer */ + while (readl(spi_imx->base + MX31_CSPISTATUS) & MX31_STATUS_RR) + readl(spi_imx->base + MXC_CSPIRXDATA); +} + +#define MX21_INTREG_RR (1 << 4) +#define MX21_INTREG_TEEN (1 << 9) +#define MX21_INTREG_RREN (1 << 13) + +#define MX21_CSPICTRL_POL (1 << 5) +#define MX21_CSPICTRL_PHA (1 << 6) +#define MX21_CSPICTRL_SSPOL (1 << 8) +#define MX21_CSPICTRL_XCH (1 << 9) +#define MX21_CSPICTRL_ENABLE (1 << 10) +#define MX21_CSPICTRL_MASTER (1 << 11) +#define MX21_CSPICTRL_DR_SHIFT 14 +#define MX21_CSPICTRL_CS_SHIFT 19 + +static void mx21_intctrl(struct spi_imx_data *spi_imx, int enable) +{ + unsigned int val = 0; + + if (enable & MXC_INT_TE) + val |= MX21_INTREG_TEEN; + if (enable & MXC_INT_RR) + val |= MX21_INTREG_RREN; + + writel(val, spi_imx->base + MXC_CSPIINT); +} + +static void mx21_trigger(struct spi_imx_data *spi_imx) +{ + unsigned int reg; + + reg = readl(spi_imx->base + MXC_CSPICTRL); + reg |= MX21_CSPICTRL_XCH; + writel(reg, spi_imx->base + MXC_CSPICTRL); +} + +static int mx21_prepare_message(struct spi_imx_data *spi_imx, + struct spi_message *msg) +{ + return 0; +} + +static int mx21_prepare_transfer(struct spi_imx_data *spi_imx, + struct spi_device *spi) +{ + unsigned int reg = MX21_CSPICTRL_ENABLE | MX21_CSPICTRL_MASTER; + unsigned int max = is_imx27_cspi(spi_imx) ? 16 : 18; + unsigned int clk; + + reg |= spi_imx_clkdiv_1(spi_imx->spi_clk, spi_imx->spi_bus_clk, max, &clk) + << MX21_CSPICTRL_DR_SHIFT; + spi_imx->spi_bus_clk = clk; + + reg |= spi_imx->bits_per_word - 1; + + if (spi->mode & SPI_CPHA) + reg |= MX21_CSPICTRL_PHA; + if (spi->mode & SPI_CPOL) + reg |= MX21_CSPICTRL_POL; + if (spi->mode & SPI_CS_HIGH) + reg |= MX21_CSPICTRL_SSPOL; + if (!spi->cs_gpiod) + reg |= spi->chip_select << MX21_CSPICTRL_CS_SHIFT; + + writel(reg, spi_imx->base + MXC_CSPICTRL); + + return 0; +} + +static int mx21_rx_available(struct spi_imx_data *spi_imx) +{ + return readl(spi_imx->base + MXC_CSPIINT) & MX21_INTREG_RR; +} + +static void mx21_reset(struct spi_imx_data *spi_imx) +{ + writel(1, spi_imx->base + MXC_RESET); +} + +#define MX1_INTREG_RR (1 << 3) +#define MX1_INTREG_TEEN (1 << 8) +#define MX1_INTREG_RREN (1 << 11) + +#define MX1_CSPICTRL_POL (1 << 4) +#define MX1_CSPICTRL_PHA (1 << 5) +#define MX1_CSPICTRL_XCH (1 << 8) +#define MX1_CSPICTRL_ENABLE (1 << 9) +#define MX1_CSPICTRL_MASTER (1 << 10) +#define MX1_CSPICTRL_DR_SHIFT 13 + +static void mx1_intctrl(struct spi_imx_data *spi_imx, int enable) +{ + unsigned int val = 0; + + if (enable & MXC_INT_TE) + val |= MX1_INTREG_TEEN; + if (enable & MXC_INT_RR) + val |= MX1_INTREG_RREN; + + writel(val, spi_imx->base + MXC_CSPIINT); +} + +static void mx1_trigger(struct spi_imx_data *spi_imx) +{ + unsigned int reg; + + reg = readl(spi_imx->base + MXC_CSPICTRL); + reg |= MX1_CSPICTRL_XCH; + writel(reg, spi_imx->base + MXC_CSPICTRL); +} + +static int mx1_prepare_message(struct spi_imx_data *spi_imx, + struct spi_message *msg) +{ + return 0; +} + +static int mx1_prepare_transfer(struct spi_imx_data *spi_imx, + struct spi_device *spi) +{ + unsigned int reg = MX1_CSPICTRL_ENABLE | MX1_CSPICTRL_MASTER; + unsigned int clk; + + reg |= spi_imx_clkdiv_2(spi_imx->spi_clk, spi_imx->spi_bus_clk, &clk) << + MX1_CSPICTRL_DR_SHIFT; + spi_imx->spi_bus_clk = clk; + + reg |= spi_imx->bits_per_word - 1; + + if (spi->mode & SPI_CPHA) + reg |= MX1_CSPICTRL_PHA; + if (spi->mode & SPI_CPOL) + reg |= MX1_CSPICTRL_POL; + + writel(reg, spi_imx->base + MXC_CSPICTRL); + + return 0; +} + +static int mx1_rx_available(struct spi_imx_data *spi_imx) +{ + return readl(spi_imx->base + MXC_CSPIINT) & MX1_INTREG_RR; +} + +static void mx1_reset(struct spi_imx_data *spi_imx) +{ + writel(1, spi_imx->base + MXC_RESET); +} + +static struct spi_imx_devtype_data imx1_cspi_devtype_data = { + .intctrl = mx1_intctrl, + .prepare_message = mx1_prepare_message, + .prepare_transfer = mx1_prepare_transfer, + .trigger = mx1_trigger, + .rx_available = mx1_rx_available, + .reset = mx1_reset, + .fifo_size = 8, + .has_dmamode = false, + .dynamic_burst = false, + .has_slavemode = false, + .devtype = IMX1_CSPI, +}; + +static struct spi_imx_devtype_data imx21_cspi_devtype_data = { + .intctrl = mx21_intctrl, + .prepare_message = mx21_prepare_message, + .prepare_transfer = mx21_prepare_transfer, + .trigger = mx21_trigger, + .rx_available = mx21_rx_available, + .reset = mx21_reset, + .fifo_size = 8, + .has_dmamode = false, + .dynamic_burst = false, + .has_slavemode = false, + .devtype = IMX21_CSPI, +}; + +static struct spi_imx_devtype_data imx27_cspi_devtype_data = { + /* i.mx27 cspi shares the functions with i.mx21 one */ + .intctrl = mx21_intctrl, + .prepare_message = mx21_prepare_message, + .prepare_transfer = mx21_prepare_transfer, + .trigger = mx21_trigger, + .rx_available = mx21_rx_available, + .reset = mx21_reset, + .fifo_size = 8, + .has_dmamode = false, + .dynamic_burst = false, + .has_slavemode = false, + .devtype = IMX27_CSPI, +}; + +static struct spi_imx_devtype_data imx31_cspi_devtype_data = { + .intctrl = mx31_intctrl, + .prepare_message = mx31_prepare_message, + .prepare_transfer = mx31_prepare_transfer, + .trigger = mx31_trigger, + .rx_available = mx31_rx_available, + .reset = mx31_reset, + .fifo_size = 8, + .has_dmamode = false, + .dynamic_burst = false, + .has_slavemode = false, + .devtype = IMX31_CSPI, +}; + +static struct spi_imx_devtype_data imx35_cspi_devtype_data = { + /* i.mx35 and later cspi shares the functions with i.mx31 one */ + .intctrl = mx31_intctrl, + .prepare_message = mx31_prepare_message, + .prepare_transfer = mx31_prepare_transfer, + .trigger = mx31_trigger, + .rx_available = mx31_rx_available, + .reset = mx31_reset, + .fifo_size = 8, + .has_dmamode = true, + .dynamic_burst = false, + .has_slavemode = false, + .devtype = IMX35_CSPI, +}; + +static struct spi_imx_devtype_data imx51_ecspi_devtype_data = { + .intctrl = mx51_ecspi_intctrl, + .prepare_message = mx51_ecspi_prepare_message, + .prepare_transfer = mx51_ecspi_prepare_transfer, + .trigger = mx51_ecspi_trigger, + .rx_available = mx51_ecspi_rx_available, + .reset = mx51_ecspi_reset, + .setup_wml = mx51_setup_wml, + .disable_dma = mx51_disable_dma, + .fifo_size = 64, + .has_dmamode = true, + .dynamic_burst = true, + .has_slavemode = true, + .disable = mx51_ecspi_disable, + .devtype = IMX51_ECSPI, +}; + +static struct spi_imx_devtype_data imx53_ecspi_devtype_data = { + .intctrl = mx51_ecspi_intctrl, + .prepare_message = mx51_ecspi_prepare_message, + .prepare_transfer = mx51_ecspi_prepare_transfer, + .trigger = mx51_ecspi_trigger, + .rx_available = mx51_ecspi_rx_available, + .disable_dma = mx51_disable_dma, + .reset = mx51_ecspi_reset, + .fifo_size = 64, + .has_dmamode = true, + .has_slavemode = true, + .disable = mx51_ecspi_disable, + .devtype = IMX53_ECSPI, +}; + +static const struct platform_device_id spi_imx_devtype[] = { + { + .name = "imx1-cspi", + .driver_data = (kernel_ulong_t) &imx1_cspi_devtype_data, + }, { + .name = "imx21-cspi", + .driver_data = (kernel_ulong_t) &imx21_cspi_devtype_data, + }, { + .name = "imx27-cspi", + .driver_data = (kernel_ulong_t) &imx27_cspi_devtype_data, + }, { + .name = "imx31-cspi", + .driver_data = (kernel_ulong_t) &imx31_cspi_devtype_data, + }, { + .name = "imx35-cspi", + .driver_data = (kernel_ulong_t) &imx35_cspi_devtype_data, + }, { + .name = "imx51-ecspi", + .driver_data = (kernel_ulong_t) &imx51_ecspi_devtype_data, + }, { + .name = "imx53-ecspi", + .driver_data = (kernel_ulong_t) &imx53_ecspi_devtype_data, + }, { + /* sentinel */ + } +}; + +static const struct of_device_id spi_imx_dt_ids[] = { + { .compatible = "fsl,imx1-cspi", .data = &imx1_cspi_devtype_data, }, + { .compatible = "fsl,imx21-cspi", .data = &imx21_cspi_devtype_data, }, + { .compatible = "fsl,imx27-cspi", .data = &imx27_cspi_devtype_data, }, + { .compatible = "fsl,imx31-cspi", .data = &imx31_cspi_devtype_data, }, + { .compatible = "fsl,imx35-cspi", .data = &imx35_cspi_devtype_data, }, + { .compatible = "fsl,imx51-ecspi", .data = &imx51_ecspi_devtype_data, }, + { .compatible = "fsl,imx53-ecspi", .data = &imx53_ecspi_devtype_data, }, + { /* sentinel */ } +}; +MODULE_DEVICE_TABLE(of, spi_imx_dt_ids); + +static void spi_imx_set_burst_len(struct spi_imx_data *spi_imx, int n_bits) +{ + u32 ctrl; + + ctrl = readl(spi_imx->base + MX51_ECSPI_CTRL); + ctrl &= ~MX51_ECSPI_CTRL_BL_MASK; + ctrl |= ((n_bits - 1) << MX51_ECSPI_CTRL_BL_OFFSET); + writel(ctrl, spi_imx->base + MX51_ECSPI_CTRL); +} + +static void spi_imx_push(struct spi_imx_data *spi_imx) +{ + unsigned int burst_len, fifo_words; + + if (spi_imx->dynamic_burst) + fifo_words = 4; + else + fifo_words = spi_imx_bytes_per_word(spi_imx->bits_per_word); + /* + * Reload the FIFO when the remaining bytes to be transferred in the + * current burst is 0. This only applies when bits_per_word is a + * multiple of 8. + */ + if (!spi_imx->remainder) { + if (spi_imx->dynamic_burst) { + + /* We need to deal unaligned data first */ + burst_len = spi_imx->count % MX51_ECSPI_CTRL_MAX_BURST; + + if (!burst_len) + burst_len = MX51_ECSPI_CTRL_MAX_BURST; + + spi_imx_set_burst_len(spi_imx, burst_len * 8); + + spi_imx->remainder = burst_len; + } else { + spi_imx->remainder = fifo_words; + } + } + + while (spi_imx->txfifo < spi_imx->devtype_data->fifo_size) { + if (!spi_imx->count) + break; + if (spi_imx->dynamic_burst && + spi_imx->txfifo >= DIV_ROUND_UP(spi_imx->remainder, + fifo_words)) + break; + spi_imx->tx(spi_imx); + spi_imx->txfifo++; + } + + if (!spi_imx->slave_mode) + spi_imx->devtype_data->trigger(spi_imx); +} + +static irqreturn_t spi_imx_isr(int irq, void *dev_id) +{ + struct spi_imx_data *spi_imx = dev_id; + + while (spi_imx->txfifo && + spi_imx->devtype_data->rx_available(spi_imx)) { + spi_imx->rx(spi_imx); + spi_imx->txfifo--; + } + + if (spi_imx->count) { + spi_imx_push(spi_imx); + return IRQ_HANDLED; + } + + if (spi_imx->txfifo) { + /* No data left to push, but still waiting for rx data, + * enable receive data available interrupt. + */ + spi_imx->devtype_data->intctrl( + spi_imx, MXC_INT_RR); + return IRQ_HANDLED; + } + + spi_imx->devtype_data->intctrl(spi_imx, 0); + complete(&spi_imx->xfer_done); + + return IRQ_HANDLED; +} + +static int spi_imx_dma_configure(struct spi_master *master) +{ + int ret; + enum dma_slave_buswidth buswidth; + struct dma_slave_config rx = {}, tx = {}; + struct spi_imx_data *spi_imx = spi_master_get_devdata(master); + + switch (spi_imx_bytes_per_word(spi_imx->bits_per_word)) { + case 4: + buswidth = DMA_SLAVE_BUSWIDTH_4_BYTES; + break; + case 2: + buswidth = DMA_SLAVE_BUSWIDTH_2_BYTES; + break; + case 1: + buswidth = DMA_SLAVE_BUSWIDTH_1_BYTE; + break; + default: + return -EINVAL; + } + + tx.direction = DMA_MEM_TO_DEV; + tx.dst_addr = spi_imx->base_phys + MXC_CSPITXDATA; + tx.dst_addr_width = buswidth; + tx.dst_maxburst = spi_imx->wml; + ret = dmaengine_slave_config(master->dma_tx, &tx); + if (ret) { + dev_err(spi_imx->dev, "TX dma configuration failed with %d\n", ret); + return ret; + } + + rx.direction = DMA_DEV_TO_MEM; + rx.src_addr = spi_imx->base_phys + MXC_CSPIRXDATA; + rx.src_addr_width = buswidth; + rx.src_maxburst = spi_imx->wml; + ret = dmaengine_slave_config(master->dma_rx, &rx); + if (ret) { + dev_err(spi_imx->dev, "RX dma configuration failed with %d\n", ret); + return ret; + } + + return 0; +} + +static int spi_imx_setupxfer(struct spi_device *spi, + struct spi_transfer *t) +{ + struct spi_imx_data *spi_imx = spi_master_get_devdata(spi->master); + + if (!t) + return 0; + + if (!t->speed_hz) { + if (!spi->max_speed_hz) { + dev_err(&spi->dev, "no speed_hz provided!\n"); + return -EINVAL; + } + dev_dbg(&spi->dev, "using spi->max_speed_hz!\n"); + spi_imx->spi_bus_clk = spi->max_speed_hz; + } else + spi_imx->spi_bus_clk = t->speed_hz; + + spi_imx->bits_per_word = t->bits_per_word; + + /* + * Initialize the functions for transfer. To transfer non byte-aligned + * words, we have to use multiple word-size bursts, we can't use + * dynamic_burst in that case. + */ + if (spi_imx->devtype_data->dynamic_burst && !spi_imx->slave_mode && + (spi_imx->bits_per_word == 8 || + spi_imx->bits_per_word == 16 || + spi_imx->bits_per_word == 32)) { + + spi_imx->rx = spi_imx_buf_rx_swap; + spi_imx->tx = spi_imx_buf_tx_swap; + spi_imx->dynamic_burst = 1; + + } else { + if (spi_imx->bits_per_word <= 8) { + spi_imx->rx = spi_imx_buf_rx_u8; + spi_imx->tx = spi_imx_buf_tx_u8; + } else if (spi_imx->bits_per_word <= 16) { + spi_imx->rx = spi_imx_buf_rx_u16; + spi_imx->tx = spi_imx_buf_tx_u16; + } else { + spi_imx->rx = spi_imx_buf_rx_u32; + spi_imx->tx = spi_imx_buf_tx_u32; + } + spi_imx->dynamic_burst = 0; + } + + if (spi_imx_can_dma(spi_imx->bitbang.master, spi, t)) + spi_imx->usedma = true; + else + spi_imx->usedma = false; + + if (is_imx53_ecspi(spi_imx) && spi_imx->slave_mode) { + spi_imx->rx = mx53_ecspi_rx_slave; + spi_imx->tx = mx53_ecspi_tx_slave; + spi_imx->slave_burst = t->len; + } + + spi_imx->devtype_data->prepare_transfer(spi_imx, spi); + + return 0; +} + +static void spi_imx_sdma_exit(struct spi_imx_data *spi_imx) +{ + struct spi_master *master = spi_imx->bitbang.master; + + if (master->dma_rx) { + dma_release_channel(master->dma_rx); + master->dma_rx = NULL; + } + + if (master->dma_tx) { + dma_release_channel(master->dma_tx); + master->dma_tx = NULL; + } +} + +static int spi_imx_sdma_init(struct device *dev, struct spi_imx_data *spi_imx, + struct spi_master *master) +{ + int ret; + + /* use pio mode for i.mx6dl chip TKT238285 */ + if (of_machine_is_compatible("fsl,imx6dl")) + return 0; + + spi_imx->wml = spi_imx->devtype_data->fifo_size / 2; + + /* Prepare for TX DMA: */ + master->dma_tx = dma_request_chan(dev, "tx"); + if (IS_ERR(master->dma_tx)) { + ret = PTR_ERR(master->dma_tx); + dev_dbg(dev, "can't get the TX DMA channel, error %d!\n", ret); + master->dma_tx = NULL; + goto err; + } + + /* Prepare for RX : */ + master->dma_rx = dma_request_chan(dev, "rx"); + if (IS_ERR(master->dma_rx)) { + ret = PTR_ERR(master->dma_rx); + dev_dbg(dev, "can't get the RX DMA channel, error %d\n", ret); + master->dma_rx = NULL; + goto err; + } + + init_completion(&spi_imx->dma_rx_completion); + init_completion(&spi_imx->dma_tx_completion); + master->can_dma = spi_imx_can_dma; + master->max_dma_len = MAX_SDMA_BD_BYTES; + spi_imx->bitbang.master->flags = SPI_MASTER_MUST_RX | + SPI_MASTER_MUST_TX; + + return 0; +err: + spi_imx_sdma_exit(spi_imx); + return ret; +} + +static void spi_imx_dma_rx_callback(void *cookie) +{ + struct spi_imx_data *spi_imx = (struct spi_imx_data *)cookie; + + complete(&spi_imx->dma_rx_completion); +} + +static void spi_imx_dma_tx_callback(void *cookie) +{ + struct spi_imx_data *spi_imx = (struct spi_imx_data *)cookie; + + complete(&spi_imx->dma_tx_completion); +} + +static int spi_imx_calculate_timeout(struct spi_imx_data *spi_imx, int size) +{ + unsigned long timeout = 0; + + /* Time with actual data transfer and CS change delay related to HW */ + timeout = (8 + 4) * size / spi_imx->spi_bus_clk; + + /* Add extra second for scheduler related activities */ + timeout += 1; + + /* Double calculated timeout */ + return msecs_to_jiffies(2 * timeout * MSEC_PER_SEC); +} + +static int spi_imx_dma_transfer(struct spi_imx_data *spi_imx, + struct spi_transfer *transfer) +{ + struct dma_async_tx_descriptor *desc_tx, *desc_rx; + unsigned long transfer_timeout; + unsigned long timeout; + struct spi_master *master = spi_imx->bitbang.master; + struct sg_table *tx = &transfer->tx_sg, *rx = &transfer->rx_sg; + struct scatterlist *last_sg = sg_last(rx->sgl, rx->nents); + unsigned int bytes_per_word, i; + int ret; + + /* Get the right burst length from the last sg to ensure no tail data */ + bytes_per_word = spi_imx_bytes_per_word(transfer->bits_per_word); + for (i = spi_imx->devtype_data->fifo_size / 2; i > 0; i--) { + if (!(sg_dma_len(last_sg) % (i * bytes_per_word))) + break; + } + /* Use 1 as wml in case no available burst length got */ + if (i == 0) + i = 1; + + spi_imx->wml = i; + + ret = spi_imx_dma_configure(master); + if (ret) + goto dma_failure_no_start; + + if (!spi_imx->devtype_data->setup_wml) { + dev_err(spi_imx->dev, "No setup_wml()?\n"); + ret = -EINVAL; + goto dma_failure_no_start; + } + spi_imx->devtype_data->setup_wml(spi_imx); + + /* + * The TX DMA setup starts the transfer, so make sure RX is configured + * before TX. + */ + desc_rx = dmaengine_prep_slave_sg(master->dma_rx, + rx->sgl, rx->nents, DMA_DEV_TO_MEM, + DMA_PREP_INTERRUPT | DMA_CTRL_ACK); + if (!desc_rx) { + ret = -EINVAL; + goto dma_failure_no_start; + } + + desc_rx->callback = spi_imx_dma_rx_callback; + desc_rx->callback_param = (void *)spi_imx; + dmaengine_submit(desc_rx); + reinit_completion(&spi_imx->dma_rx_completion); + dma_async_issue_pending(master->dma_rx); + + desc_tx = dmaengine_prep_slave_sg(master->dma_tx, + tx->sgl, tx->nents, DMA_MEM_TO_DEV, + DMA_PREP_INTERRUPT | DMA_CTRL_ACK); + if (!desc_tx) { + dmaengine_terminate_all(master->dma_tx); + dmaengine_terminate_all(master->dma_rx); + return -EINVAL; + } + + desc_tx->callback = spi_imx_dma_tx_callback; + desc_tx->callback_param = (void *)spi_imx; + dmaengine_submit(desc_tx); + reinit_completion(&spi_imx->dma_tx_completion); + dma_async_issue_pending(master->dma_tx); + + transfer_timeout = spi_imx_calculate_timeout(spi_imx, transfer->len); + + /* Wait SDMA to finish the data transfer.*/ + timeout = wait_for_completion_timeout(&spi_imx->dma_tx_completion, + transfer_timeout); + if (!timeout) { + dev_err(spi_imx->dev, "I/O Error in DMA TX\n"); + dmaengine_terminate_all(master->dma_tx); + dmaengine_terminate_all(master->dma_rx); + return -ETIMEDOUT; + } + + timeout = wait_for_completion_timeout(&spi_imx->dma_rx_completion, + transfer_timeout); + if (!timeout) { + dev_err(&master->dev, "I/O Error in DMA RX\n"); + spi_imx->devtype_data->reset(spi_imx); + dmaengine_terminate_all(master->dma_rx); + return -ETIMEDOUT; + } + + return transfer->len; +/* fallback to pio */ +dma_failure_no_start: + transfer->error |= SPI_TRANS_FAIL_NO_START; + return ret; +} + +static int spi_imx_pio_transfer(struct spi_device *spi, + struct spi_transfer *transfer) +{ + struct spi_imx_data *spi_imx = spi_master_get_devdata(spi->master); + unsigned long transfer_timeout; + unsigned long timeout; + + spi_imx->tx_buf = transfer->tx_buf; + spi_imx->rx_buf = transfer->rx_buf; + spi_imx->count = transfer->len; + spi_imx->txfifo = 0; + spi_imx->remainder = 0; + + reinit_completion(&spi_imx->xfer_done); + + spi_imx_push(spi_imx); + + spi_imx->devtype_data->intctrl(spi_imx, MXC_INT_TE); + + transfer_timeout = spi_imx_calculate_timeout(spi_imx, transfer->len); + + timeout = wait_for_completion_timeout(&spi_imx->xfer_done, + transfer_timeout); + if (!timeout) { + dev_err(&spi->dev, "I/O Error in PIO\n"); + spi_imx->devtype_data->reset(spi_imx); + return -ETIMEDOUT; + } + + return transfer->len; +} + +static int spi_imx_pio_transfer_slave(struct spi_device *spi, + struct spi_transfer *transfer) +{ + struct spi_imx_data *spi_imx = spi_master_get_devdata(spi->master); + int ret = transfer->len; + + if (is_imx53_ecspi(spi_imx) && + transfer->len > MX53_MAX_TRANSFER_BYTES) { + dev_err(&spi->dev, "Transaction too big, max size is %d bytes\n", + MX53_MAX_TRANSFER_BYTES); + return -EMSGSIZE; + } + + spi_imx->tx_buf = transfer->tx_buf; + spi_imx->rx_buf = transfer->rx_buf; + spi_imx->count = transfer->len; + spi_imx->txfifo = 0; + spi_imx->remainder = 0; + + reinit_completion(&spi_imx->xfer_done); + spi_imx->slave_aborted = false; + + spi_imx_push(spi_imx); + + spi_imx->devtype_data->intctrl(spi_imx, MXC_INT_TE | MXC_INT_RDR); + + if (wait_for_completion_interruptible(&spi_imx->xfer_done) || + spi_imx->slave_aborted) { + dev_dbg(&spi->dev, "interrupted\n"); + ret = -EINTR; + } + + /* ecspi has a HW issue when works in Slave mode, + * after 64 words writtern to TXFIFO, even TXFIFO becomes empty, + * ECSPI_TXDATA keeps shift out the last word data, + * so we have to disable ECSPI when in slave mode after the + * transfer completes + */ + if (spi_imx->devtype_data->disable) + spi_imx->devtype_data->disable(spi_imx); + + return ret; +} + +static int spi_imx_transfer(struct spi_device *spi, + struct spi_transfer *transfer) +{ + struct spi_imx_data *spi_imx = spi_master_get_devdata(spi->master); + + transfer->effective_speed_hz = spi_imx->spi_bus_clk; + + /* flush rxfifo before transfer */ + while (spi_imx->devtype_data->rx_available(spi_imx)) + readl(spi_imx->base + MXC_CSPIRXDATA); + + if (spi_imx->slave_mode) + return spi_imx_pio_transfer_slave(spi, transfer); + + if (spi_imx->usedma) + return spi_imx_dma_transfer(spi_imx, transfer); + + return spi_imx_pio_transfer(spi, transfer); +} + +static int spi_imx_setup(struct spi_device *spi) +{ + dev_dbg(&spi->dev, "%s: mode %d, %u bpw, %d hz\n", __func__, + spi->mode, spi->bits_per_word, spi->max_speed_hz); + + return 0; +} + +static void spi_imx_cleanup(struct spi_device *spi) +{ +} + +static int +spi_imx_prepare_message(struct spi_master *master, struct spi_message *msg) +{ + struct spi_imx_data *spi_imx = spi_master_get_devdata(master); + int ret; + + ret = pm_runtime_resume_and_get(spi_imx->dev); + if (ret < 0) { + dev_err(spi_imx->dev, "failed to enable clock\n"); + return ret; + } + + ret = spi_imx->devtype_data->prepare_message(spi_imx, msg); + if (ret) { + pm_runtime_mark_last_busy(spi_imx->dev); + pm_runtime_put_autosuspend(spi_imx->dev); + } + + return ret; +} + +static int +spi_imx_unprepare_message(struct spi_master *master, struct spi_message *msg) +{ + struct spi_imx_data *spi_imx = spi_master_get_devdata(master); + + pm_runtime_mark_last_busy(spi_imx->dev); + pm_runtime_put_autosuspend(spi_imx->dev); + return 0; +} + +static int spi_imx_slave_abort(struct spi_master *master) +{ + struct spi_imx_data *spi_imx = spi_master_get_devdata(master); + + spi_imx->slave_aborted = true; + complete(&spi_imx->xfer_done); + + return 0; +} + +static int spi_imx_probe(struct platform_device *pdev) +{ + struct device_node *np = pdev->dev.of_node; + const struct of_device_id *of_id = + of_match_device(spi_imx_dt_ids, &pdev->dev); + struct spi_master *master; + struct spi_imx_data *spi_imx; + struct resource *res; + int ret, irq, spi_drctl; + const struct spi_imx_devtype_data *devtype_data = of_id ? of_id->data : + (struct spi_imx_devtype_data *)pdev->id_entry->driver_data; + bool slave_mode; + u32 val; + + slave_mode = devtype_data->has_slavemode && + of_property_read_bool(np, "spi-slave"); + if (slave_mode) + master = spi_alloc_slave(&pdev->dev, + sizeof(struct spi_imx_data)); + else + master = spi_alloc_master(&pdev->dev, + sizeof(struct spi_imx_data)); + if (!master) + return -ENOMEM; + + ret = of_property_read_u32(np, "fsl,spi-rdy-drctl", &spi_drctl); + if ((ret < 0) || (spi_drctl >= 0x3)) { + /* '11' is reserved */ + spi_drctl = 0; + } + + platform_set_drvdata(pdev, master); + + master->bits_per_word_mask = SPI_BPW_RANGE_MASK(1, 32); + master->bus_num = np ? -1 : pdev->id; + master->use_gpio_descriptors = true; + + spi_imx = spi_master_get_devdata(master); + spi_imx->bitbang.master = master; + spi_imx->dev = &pdev->dev; + spi_imx->slave_mode = slave_mode; + + spi_imx->devtype_data = devtype_data; + + /* + * Get number of chip selects from device properties. This can be + * coming from device tree or boardfiles, if it is not defined, + * a default value of 3 chip selects will be used, as all the legacy + * board files have <= 3 chip selects. + */ + if (!device_property_read_u32(&pdev->dev, "num-cs", &val)) + master->num_chipselect = val; + else + master->num_chipselect = 3; + + spi_imx->bitbang.setup_transfer = spi_imx_setupxfer; + spi_imx->bitbang.txrx_bufs = spi_imx_transfer; + spi_imx->bitbang.master->setup = spi_imx_setup; + spi_imx->bitbang.master->cleanup = spi_imx_cleanup; + spi_imx->bitbang.master->prepare_message = spi_imx_prepare_message; + spi_imx->bitbang.master->unprepare_message = spi_imx_unprepare_message; + spi_imx->bitbang.master->slave_abort = spi_imx_slave_abort; + spi_imx->bitbang.master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH \ + | SPI_NO_CS; + if (is_imx35_cspi(spi_imx) || is_imx51_ecspi(spi_imx) || + is_imx53_ecspi(spi_imx)) + spi_imx->bitbang.master->mode_bits |= SPI_LOOP | SPI_READY; + + spi_imx->spi_drctl = spi_drctl; + + init_completion(&spi_imx->xfer_done); + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + spi_imx->base = devm_ioremap_resource(&pdev->dev, res); + if (IS_ERR(spi_imx->base)) { + ret = PTR_ERR(spi_imx->base); + goto out_master_put; + } + spi_imx->base_phys = res->start; + + irq = platform_get_irq(pdev, 0); + if (irq < 0) { + ret = irq; + goto out_master_put; + } + + ret = devm_request_irq(&pdev->dev, irq, spi_imx_isr, 0, + dev_name(&pdev->dev), spi_imx); + if (ret) { + dev_err(&pdev->dev, "can't get irq%d: %d\n", irq, ret); + goto out_master_put; + } + + spi_imx->clk_ipg = devm_clk_get(&pdev->dev, "ipg"); + if (IS_ERR(spi_imx->clk_ipg)) { + ret = PTR_ERR(spi_imx->clk_ipg); + goto out_master_put; + } + + spi_imx->clk_per = devm_clk_get(&pdev->dev, "per"); + if (IS_ERR(spi_imx->clk_per)) { + ret = PTR_ERR(spi_imx->clk_per); + goto out_master_put; + } + + ret = clk_prepare_enable(spi_imx->clk_per); + if (ret) + goto out_master_put; + + ret = clk_prepare_enable(spi_imx->clk_ipg); + if (ret) + goto out_put_per; + + pm_runtime_set_autosuspend_delay(spi_imx->dev, MXC_RPM_TIMEOUT); + pm_runtime_use_autosuspend(spi_imx->dev); + pm_runtime_get_noresume(spi_imx->dev); + pm_runtime_set_active(spi_imx->dev); + pm_runtime_enable(spi_imx->dev); + + spi_imx->spi_clk = clk_get_rate(spi_imx->clk_per); + /* + * Only validated on i.mx35 and i.mx6 now, can remove the constraint + * if validated on other chips. + */ + if (spi_imx->devtype_data->has_dmamode) { + ret = spi_imx_sdma_init(&pdev->dev, spi_imx, master); + if (ret == -EPROBE_DEFER) + goto out_runtime_pm_put; + + if (ret < 0) + dev_dbg(&pdev->dev, "dma setup error %d, use pio\n", + ret); + } + + spi_imx->devtype_data->reset(spi_imx); + + spi_imx->devtype_data->intctrl(spi_imx, 0); + + master->dev.of_node = pdev->dev.of_node; + ret = spi_bitbang_start(&spi_imx->bitbang); + if (ret) { + dev_err_probe(&pdev->dev, ret, "bitbang start failed\n"); + goto out_bitbang_start; + } + + pm_runtime_mark_last_busy(spi_imx->dev); + pm_runtime_put_autosuspend(spi_imx->dev); + + return ret; + +out_bitbang_start: + if (spi_imx->devtype_data->has_dmamode) + spi_imx_sdma_exit(spi_imx); +out_runtime_pm_put: + pm_runtime_dont_use_autosuspend(spi_imx->dev); + pm_runtime_set_suspended(&pdev->dev); + pm_runtime_disable(spi_imx->dev); + + clk_disable_unprepare(spi_imx->clk_ipg); +out_put_per: + clk_disable_unprepare(spi_imx->clk_per); +out_master_put: + spi_master_put(master); + + return ret; +} + +static int spi_imx_remove(struct platform_device *pdev) +{ + struct spi_master *master = platform_get_drvdata(pdev); + struct spi_imx_data *spi_imx = spi_master_get_devdata(master); + int ret; + + spi_bitbang_stop(&spi_imx->bitbang); + + ret = pm_runtime_get_sync(spi_imx->dev); + if (ret >= 0) + writel(0, spi_imx->base + MXC_CSPICTRL); + else + dev_warn(spi_imx->dev, "failed to enable clock, skip hw disable\n"); + + pm_runtime_dont_use_autosuspend(spi_imx->dev); + pm_runtime_put_sync(spi_imx->dev); + pm_runtime_disable(spi_imx->dev); + + spi_imx_sdma_exit(spi_imx); + spi_master_put(master); + + return 0; +} + +static int __maybe_unused spi_imx_runtime_resume(struct device *dev) +{ + struct spi_master *master = dev_get_drvdata(dev); + struct spi_imx_data *spi_imx; + int ret; + + spi_imx = spi_master_get_devdata(master); + + ret = clk_prepare_enable(spi_imx->clk_per); + if (ret) + return ret; + + ret = clk_prepare_enable(spi_imx->clk_ipg); + if (ret) { + clk_disable_unprepare(spi_imx->clk_per); + return ret; + } + + return 0; +} + +static int __maybe_unused spi_imx_runtime_suspend(struct device *dev) +{ + struct spi_master *master = dev_get_drvdata(dev); + struct spi_imx_data *spi_imx; + + spi_imx = spi_master_get_devdata(master); + + clk_disable_unprepare(spi_imx->clk_per); + clk_disable_unprepare(spi_imx->clk_ipg); + + return 0; +} + +static int __maybe_unused spi_imx_suspend(struct device *dev) +{ + pinctrl_pm_select_sleep_state(dev); + return 0; +} + +static int __maybe_unused spi_imx_resume(struct device *dev) +{ + pinctrl_pm_select_default_state(dev); + return 0; +} + +static const struct dev_pm_ops imx_spi_pm = { + SET_RUNTIME_PM_OPS(spi_imx_runtime_suspend, + spi_imx_runtime_resume, NULL) + SET_SYSTEM_SLEEP_PM_OPS(spi_imx_suspend, spi_imx_resume) +}; + +static struct platform_driver spi_imx_driver = { + .driver = { + .name = DRIVER_NAME, + .of_match_table = spi_imx_dt_ids, + .pm = &imx_spi_pm, + }, + .id_table = spi_imx_devtype, + .probe = spi_imx_probe, + .remove = spi_imx_remove, +}; +module_platform_driver(spi_imx_driver); + +MODULE_DESCRIPTION("SPI Controller driver"); +MODULE_AUTHOR("Sascha Hauer, Pengutronix"); +MODULE_LICENSE("GPL"); +MODULE_ALIAS("platform:" DRIVER_NAME); diff --git a/drivers/spi/spi-iproc-qspi.c b/drivers/spi/spi-iproc-qspi.c new file mode 100644 index 000000000..de297dacf --- /dev/null +++ b/drivers/spi/spi-iproc-qspi.c @@ -0,0 +1,155 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright 2016 Broadcom Limited + */ + +#include <linux/device.h> +#include <linux/io.h> +#include <linux/ioport.h> +#include <linux/module.h> +#include <linux/of.h> +#include <linux/of_address.h> +#include <linux/platform_device.h> +#include <linux/slab.h> + +#include "spi-bcm-qspi.h" + +#define INTR_BASE_BIT_SHIFT 0x02 +#define INTR_COUNT 0x07 + +struct bcm_iproc_intc { + struct bcm_qspi_soc_intc soc_intc; + struct platform_device *pdev; + void __iomem *int_reg; + void __iomem *int_status_reg; + spinlock_t soclock; + bool big_endian; +}; + +static u32 bcm_iproc_qspi_get_l2_int_status(struct bcm_qspi_soc_intc *soc_intc) +{ + struct bcm_iproc_intc *priv = + container_of(soc_intc, struct bcm_iproc_intc, soc_intc); + void __iomem *mmio = priv->int_status_reg; + int i; + u32 val = 0, sts = 0; + + for (i = 0; i < INTR_COUNT; i++) { + if (bcm_qspi_readl(priv->big_endian, mmio + (i * 4))) + val |= 1UL << i; + } + + if (val & INTR_MSPI_DONE_MASK) + sts |= MSPI_DONE; + + if (val & BSPI_LR_INTERRUPTS_ALL) + sts |= BSPI_DONE; + + if (val & BSPI_LR_INTERRUPTS_ERROR) + sts |= BSPI_ERR; + + return sts; +} + +static void bcm_iproc_qspi_int_ack(struct bcm_qspi_soc_intc *soc_intc, int type) +{ + struct bcm_iproc_intc *priv = + container_of(soc_intc, struct bcm_iproc_intc, soc_intc); + void __iomem *mmio = priv->int_status_reg; + u32 mask = get_qspi_mask(type); + int i; + + for (i = 0; i < INTR_COUNT; i++) { + if (mask & (1UL << i)) + bcm_qspi_writel(priv->big_endian, 1, mmio + (i * 4)); + } +} + +static void bcm_iproc_qspi_int_set(struct bcm_qspi_soc_intc *soc_intc, int type, + bool en) +{ + struct bcm_iproc_intc *priv = + container_of(soc_intc, struct bcm_iproc_intc, soc_intc); + void __iomem *mmio = priv->int_reg; + u32 mask = get_qspi_mask(type); + u32 val; + unsigned long flags; + + spin_lock_irqsave(&priv->soclock, flags); + + val = bcm_qspi_readl(priv->big_endian, mmio); + + if (en) + val = val | (mask << INTR_BASE_BIT_SHIFT); + else + val = val & ~(mask << INTR_BASE_BIT_SHIFT); + + bcm_qspi_writel(priv->big_endian, val, mmio); + + spin_unlock_irqrestore(&priv->soclock, flags); +} + +static int bcm_iproc_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct bcm_iproc_intc *priv; + struct bcm_qspi_soc_intc *soc_intc; + struct resource *res; + + priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); + if (!priv) + return -ENOMEM; + soc_intc = &priv->soc_intc; + priv->pdev = pdev; + + spin_lock_init(&priv->soclock); + + res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "intr_regs"); + priv->int_reg = devm_ioremap_resource(dev, res); + if (IS_ERR(priv->int_reg)) + return PTR_ERR(priv->int_reg); + + res = platform_get_resource_byname(pdev, IORESOURCE_MEM, + "intr_status_reg"); + priv->int_status_reg = devm_ioremap_resource(dev, res); + if (IS_ERR(priv->int_status_reg)) + return PTR_ERR(priv->int_status_reg); + + priv->big_endian = of_device_is_big_endian(dev->of_node); + + bcm_iproc_qspi_int_ack(soc_intc, MSPI_BSPI_DONE); + bcm_iproc_qspi_int_set(soc_intc, MSPI_BSPI_DONE, false); + + soc_intc->bcm_qspi_int_ack = bcm_iproc_qspi_int_ack; + soc_intc->bcm_qspi_int_set = bcm_iproc_qspi_int_set; + soc_intc->bcm_qspi_get_int_status = bcm_iproc_qspi_get_l2_int_status; + + return bcm_qspi_probe(pdev, soc_intc); +} + +static int bcm_iproc_remove(struct platform_device *pdev) +{ + return bcm_qspi_remove(pdev); +} + +static const struct of_device_id bcm_iproc_of_match[] = { + { .compatible = "brcm,spi-nsp-qspi" }, + { .compatible = "brcm,spi-ns2-qspi" }, + {}, +}; +MODULE_DEVICE_TABLE(of, bcm_iproc_of_match); + +static struct platform_driver bcm_iproc_driver = { + .probe = bcm_iproc_probe, + .remove = bcm_iproc_remove, + .driver = { + .name = "bcm_iproc", + .pm = &bcm_qspi_pm_ops, + .of_match_table = bcm_iproc_of_match, + } +}; +module_platform_driver(bcm_iproc_driver); + +MODULE_LICENSE("GPL v2"); +MODULE_AUTHOR("Kamal Dasu"); +MODULE_DESCRIPTION("SPI flash driver for Broadcom iProc SoCs"); diff --git a/drivers/spi/spi-jcore.c b/drivers/spi/spi-jcore.c new file mode 100644 index 000000000..bba10f030 --- /dev/null +++ b/drivers/spi/spi-jcore.c @@ -0,0 +1,234 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * J-Core SPI controller driver + * + * Copyright (C) 2012-2016 Smart Energy Instruments, Inc. + * + * Current version by Rich Felker + * Based loosely on initial version by Oleksandr G Zhadan + * + */ +#include <linux/init.h> +#include <linux/interrupt.h> +#include <linux/errno.h> +#include <linux/module.h> +#include <linux/platform_device.h> +#include <linux/spi/spi.h> +#include <linux/clk.h> +#include <linux/err.h> +#include <linux/io.h> +#include <linux/of.h> +#include <linux/delay.h> + +#define DRV_NAME "jcore_spi" + +#define CTRL_REG 0x0 +#define DATA_REG 0x4 + +#define JCORE_SPI_CTRL_XMIT 0x02 +#define JCORE_SPI_STAT_BUSY 0x02 +#define JCORE_SPI_CTRL_LOOP 0x08 +#define JCORE_SPI_CTRL_CS_BITS 0x15 + +#define JCORE_SPI_WAIT_RDY_MAX_LOOP 2000000 + +struct jcore_spi { + struct spi_master *master; + void __iomem *base; + unsigned int cs_reg; + unsigned int speed_reg; + unsigned int speed_hz; + unsigned int clock_freq; +}; + +static int jcore_spi_wait(void __iomem *ctrl_reg) +{ + unsigned timeout = JCORE_SPI_WAIT_RDY_MAX_LOOP; + + do { + if (!(readl(ctrl_reg) & JCORE_SPI_STAT_BUSY)) + return 0; + cpu_relax(); + } while (--timeout); + + return -EBUSY; +} + +static void jcore_spi_program(struct jcore_spi *hw) +{ + void __iomem *ctrl_reg = hw->base + CTRL_REG; + + if (jcore_spi_wait(ctrl_reg)) + dev_err(hw->master->dev.parent, + "timeout waiting to program ctrl reg.\n"); + + writel(hw->cs_reg | hw->speed_reg, ctrl_reg); +} + +static void jcore_spi_chipsel(struct spi_device *spi, bool value) +{ + struct jcore_spi *hw = spi_master_get_devdata(spi->master); + u32 csbit = 1U << (2 * spi->chip_select); + + dev_dbg(hw->master->dev.parent, "chipselect %d\n", spi->chip_select); + + if (value) + hw->cs_reg |= csbit; + else + hw->cs_reg &= ~csbit; + + jcore_spi_program(hw); +} + +static void jcore_spi_baudrate(struct jcore_spi *hw, int speed) +{ + if (speed == hw->speed_hz) return; + hw->speed_hz = speed; + if (speed >= hw->clock_freq / 2) + hw->speed_reg = 0; + else + hw->speed_reg = ((hw->clock_freq / 2 / speed) - 1) << 27; + jcore_spi_program(hw); + dev_dbg(hw->master->dev.parent, "speed=%d reg=0x%x\n", + speed, hw->speed_reg); +} + +static int jcore_spi_txrx(struct spi_master *master, struct spi_device *spi, + struct spi_transfer *t) +{ + struct jcore_spi *hw = spi_master_get_devdata(master); + + void __iomem *ctrl_reg = hw->base + CTRL_REG; + void __iomem *data_reg = hw->base + DATA_REG; + u32 xmit; + + /* data buffers */ + const unsigned char *tx; + unsigned char *rx; + unsigned int len; + unsigned int count; + + jcore_spi_baudrate(hw, t->speed_hz); + + xmit = hw->cs_reg | hw->speed_reg | JCORE_SPI_CTRL_XMIT; + tx = t->tx_buf; + rx = t->rx_buf; + len = t->len; + + for (count = 0; count < len; count++) { + if (jcore_spi_wait(ctrl_reg)) + break; + + writel(tx ? *tx++ : 0, data_reg); + writel(xmit, ctrl_reg); + + if (jcore_spi_wait(ctrl_reg)) + break; + + if (rx) + *rx++ = readl(data_reg); + } + + spi_finalize_current_transfer(master); + + if (count < len) + return -EREMOTEIO; + + return 0; +} + +static int jcore_spi_probe(struct platform_device *pdev) +{ + struct device_node *node = pdev->dev.of_node; + struct jcore_spi *hw; + struct spi_master *master; + struct resource *res; + u32 clock_freq; + struct clk *clk; + int err = -ENODEV; + + master = spi_alloc_master(&pdev->dev, sizeof(struct jcore_spi)); + if (!master) + return err; + + /* Setup the master state. */ + master->num_chipselect = 3; + master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH; + master->transfer_one = jcore_spi_txrx; + master->set_cs = jcore_spi_chipsel; + master->dev.of_node = node; + master->bus_num = pdev->id; + + hw = spi_master_get_devdata(master); + hw->master = master; + platform_set_drvdata(pdev, hw); + + /* Find and map our resources */ + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + if (!res) + goto exit_busy; + if (!devm_request_mem_region(&pdev->dev, res->start, + resource_size(res), pdev->name)) + goto exit_busy; + hw->base = devm_ioremap(&pdev->dev, res->start, + resource_size(res)); + if (!hw->base) + goto exit_busy; + + /* + * The SPI clock rate controlled via a configurable clock divider + * which is applied to the reference clock. A 50 MHz reference is + * most suitable for obtaining standard SPI clock rates, but some + * designs may have a different reference clock, and the DT must + * make the driver aware so that it can properly program the + * requested rate. If the clock is omitted, 50 MHz is assumed. + */ + clock_freq = 50000000; + clk = devm_clk_get(&pdev->dev, "ref_clk"); + if (!IS_ERR(clk)) { + if (clk_prepare_enable(clk) == 0) { + clock_freq = clk_get_rate(clk); + clk_disable_unprepare(clk); + } else + dev_warn(&pdev->dev, "could not enable ref_clk\n"); + } + hw->clock_freq = clock_freq; + + /* Initialize all CS bits to high. */ + hw->cs_reg = JCORE_SPI_CTRL_CS_BITS; + jcore_spi_baudrate(hw, 400000); + + /* Register our spi controller */ + err = devm_spi_register_master(&pdev->dev, master); + if (err) + goto exit; + + return 0; + +exit_busy: + err = -EBUSY; +exit: + spi_master_put(master); + return err; +} + +static const struct of_device_id jcore_spi_of_match[] = { + { .compatible = "jcore,spi2" }, + {}, +}; +MODULE_DEVICE_TABLE(of, jcore_spi_of_match); + +static struct platform_driver jcore_spi_driver = { + .probe = jcore_spi_probe, + .driver = { + .name = DRV_NAME, + .of_match_table = jcore_spi_of_match, + }, +}; + +module_platform_driver(jcore_spi_driver); + +MODULE_DESCRIPTION("J-Core SPI driver"); +MODULE_AUTHOR("Rich Felker <dalias@libc.org>"); +MODULE_LICENSE("GPL"); +MODULE_ALIAS("platform:" DRV_NAME); diff --git a/drivers/spi/spi-lantiq-ssc.c b/drivers/spi/spi-lantiq-ssc.c new file mode 100644 index 000000000..bcb526018 --- /dev/null +++ b/drivers/spi/spi-lantiq-ssc.c @@ -0,0 +1,1057 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright (C) 2011-2015 Daniel Schwierzeck <daniel.schwierzeck@gmail.com> + * Copyright (C) 2016 Hauke Mehrtens <hauke@hauke-m.de> + */ + +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/of_device.h> +#include <linux/clk.h> +#include <linux/io.h> +#include <linux/delay.h> +#include <linux/interrupt.h> +#include <linux/sched.h> +#include <linux/completion.h> +#include <linux/spinlock.h> +#include <linux/err.h> +#include <linux/pm_runtime.h> +#include <linux/spi/spi.h> + +#ifdef CONFIG_LANTIQ +#include <lantiq_soc.h> +#endif + +#define LTQ_SPI_RX_IRQ_NAME "spi_rx" +#define LTQ_SPI_TX_IRQ_NAME "spi_tx" +#define LTQ_SPI_ERR_IRQ_NAME "spi_err" +#define LTQ_SPI_FRM_IRQ_NAME "spi_frm" + +#define LTQ_SPI_CLC 0x00 +#define LTQ_SPI_PISEL 0x04 +#define LTQ_SPI_ID 0x08 +#define LTQ_SPI_CON 0x10 +#define LTQ_SPI_STAT 0x14 +#define LTQ_SPI_WHBSTATE 0x18 +#define LTQ_SPI_TB 0x20 +#define LTQ_SPI_RB 0x24 +#define LTQ_SPI_RXFCON 0x30 +#define LTQ_SPI_TXFCON 0x34 +#define LTQ_SPI_FSTAT 0x38 +#define LTQ_SPI_BRT 0x40 +#define LTQ_SPI_BRSTAT 0x44 +#define LTQ_SPI_SFCON 0x60 +#define LTQ_SPI_SFSTAT 0x64 +#define LTQ_SPI_GPOCON 0x70 +#define LTQ_SPI_GPOSTAT 0x74 +#define LTQ_SPI_FPGO 0x78 +#define LTQ_SPI_RXREQ 0x80 +#define LTQ_SPI_RXCNT 0x84 +#define LTQ_SPI_DMACON 0xec +#define LTQ_SPI_IRNEN 0xf4 + +#define LTQ_SPI_CLC_SMC_S 16 /* Clock divider for sleep mode */ +#define LTQ_SPI_CLC_SMC_M (0xFF << LTQ_SPI_CLC_SMC_S) +#define LTQ_SPI_CLC_RMC_S 8 /* Clock divider for normal run mode */ +#define LTQ_SPI_CLC_RMC_M (0xFF << LTQ_SPI_CLC_RMC_S) +#define LTQ_SPI_CLC_DISS BIT(1) /* Disable status bit */ +#define LTQ_SPI_CLC_DISR BIT(0) /* Disable request bit */ + +#define LTQ_SPI_ID_TXFS_S 24 /* Implemented TX FIFO size */ +#define LTQ_SPI_ID_RXFS_S 16 /* Implemented RX FIFO size */ +#define LTQ_SPI_ID_MOD_S 8 /* Module ID */ +#define LTQ_SPI_ID_MOD_M (0xff << LTQ_SPI_ID_MOD_S) +#define LTQ_SPI_ID_CFG_S 5 /* DMA interface support */ +#define LTQ_SPI_ID_CFG_M (1 << LTQ_SPI_ID_CFG_S) +#define LTQ_SPI_ID_REV_M 0x1F /* Hardware revision number */ + +#define LTQ_SPI_CON_BM_S 16 /* Data width selection */ +#define LTQ_SPI_CON_BM_M (0x1F << LTQ_SPI_CON_BM_S) +#define LTQ_SPI_CON_EM BIT(24) /* Echo mode */ +#define LTQ_SPI_CON_IDLE BIT(23) /* Idle bit value */ +#define LTQ_SPI_CON_ENBV BIT(22) /* Enable byte valid control */ +#define LTQ_SPI_CON_RUEN BIT(12) /* Receive underflow error enable */ +#define LTQ_SPI_CON_TUEN BIT(11) /* Transmit underflow error enable */ +#define LTQ_SPI_CON_AEN BIT(10) /* Abort error enable */ +#define LTQ_SPI_CON_REN BIT(9) /* Receive overflow error enable */ +#define LTQ_SPI_CON_TEN BIT(8) /* Transmit overflow error enable */ +#define LTQ_SPI_CON_LB BIT(7) /* Loopback control */ +#define LTQ_SPI_CON_PO BIT(6) /* Clock polarity control */ +#define LTQ_SPI_CON_PH BIT(5) /* Clock phase control */ +#define LTQ_SPI_CON_HB BIT(4) /* Heading control */ +#define LTQ_SPI_CON_RXOFF BIT(1) /* Switch receiver off */ +#define LTQ_SPI_CON_TXOFF BIT(0) /* Switch transmitter off */ + +#define LTQ_SPI_STAT_RXBV_S 28 +#define LTQ_SPI_STAT_RXBV_M (0x7 << LTQ_SPI_STAT_RXBV_S) +#define LTQ_SPI_STAT_BSY BIT(13) /* Busy flag */ +#define LTQ_SPI_STAT_RUE BIT(12) /* Receive underflow error flag */ +#define LTQ_SPI_STAT_TUE BIT(11) /* Transmit underflow error flag */ +#define LTQ_SPI_STAT_AE BIT(10) /* Abort error flag */ +#define LTQ_SPI_STAT_RE BIT(9) /* Receive error flag */ +#define LTQ_SPI_STAT_TE BIT(8) /* Transmit error flag */ +#define LTQ_SPI_STAT_ME BIT(7) /* Mode error flag */ +#define LTQ_SPI_STAT_MS BIT(1) /* Master/slave select bit */ +#define LTQ_SPI_STAT_EN BIT(0) /* Enable bit */ +#define LTQ_SPI_STAT_ERRORS (LTQ_SPI_STAT_ME | LTQ_SPI_STAT_TE | \ + LTQ_SPI_STAT_RE | LTQ_SPI_STAT_AE | \ + LTQ_SPI_STAT_TUE | LTQ_SPI_STAT_RUE) + +#define LTQ_SPI_WHBSTATE_SETTUE BIT(15) /* Set transmit underflow error flag */ +#define LTQ_SPI_WHBSTATE_SETAE BIT(14) /* Set abort error flag */ +#define LTQ_SPI_WHBSTATE_SETRE BIT(13) /* Set receive error flag */ +#define LTQ_SPI_WHBSTATE_SETTE BIT(12) /* Set transmit error flag */ +#define LTQ_SPI_WHBSTATE_CLRTUE BIT(11) /* Clear transmit underflow error flag */ +#define LTQ_SPI_WHBSTATE_CLRAE BIT(10) /* Clear abort error flag */ +#define LTQ_SPI_WHBSTATE_CLRRE BIT(9) /* Clear receive error flag */ +#define LTQ_SPI_WHBSTATE_CLRTE BIT(8) /* Clear transmit error flag */ +#define LTQ_SPI_WHBSTATE_SETME BIT(7) /* Set mode error flag */ +#define LTQ_SPI_WHBSTATE_CLRME BIT(6) /* Clear mode error flag */ +#define LTQ_SPI_WHBSTATE_SETRUE BIT(5) /* Set receive underflow error flag */ +#define LTQ_SPI_WHBSTATE_CLRRUE BIT(4) /* Clear receive underflow error flag */ +#define LTQ_SPI_WHBSTATE_SETMS BIT(3) /* Set master select bit */ +#define LTQ_SPI_WHBSTATE_CLRMS BIT(2) /* Clear master select bit */ +#define LTQ_SPI_WHBSTATE_SETEN BIT(1) /* Set enable bit (operational mode) */ +#define LTQ_SPI_WHBSTATE_CLREN BIT(0) /* Clear enable bit (config mode */ +#define LTQ_SPI_WHBSTATE_CLR_ERRORS (LTQ_SPI_WHBSTATE_CLRRUE | \ + LTQ_SPI_WHBSTATE_CLRME | \ + LTQ_SPI_WHBSTATE_CLRTE | \ + LTQ_SPI_WHBSTATE_CLRRE | \ + LTQ_SPI_WHBSTATE_CLRAE | \ + LTQ_SPI_WHBSTATE_CLRTUE) + +#define LTQ_SPI_RXFCON_RXFITL_S 8 /* FIFO interrupt trigger level */ +#define LTQ_SPI_RXFCON_RXFLU BIT(1) /* FIFO flush */ +#define LTQ_SPI_RXFCON_RXFEN BIT(0) /* FIFO enable */ + +#define LTQ_SPI_TXFCON_TXFITL_S 8 /* FIFO interrupt trigger level */ +#define LTQ_SPI_TXFCON_TXFLU BIT(1) /* FIFO flush */ +#define LTQ_SPI_TXFCON_TXFEN BIT(0) /* FIFO enable */ + +#define LTQ_SPI_FSTAT_RXFFL_S 0 +#define LTQ_SPI_FSTAT_TXFFL_S 8 + +#define LTQ_SPI_GPOCON_ISCSBN_S 8 +#define LTQ_SPI_GPOCON_INVOUTN_S 0 + +#define LTQ_SPI_FGPO_SETOUTN_S 8 +#define LTQ_SPI_FGPO_CLROUTN_S 0 + +#define LTQ_SPI_RXREQ_RXCNT_M 0xFFFF /* Receive count value */ +#define LTQ_SPI_RXCNT_TODO_M 0xFFFF /* Recevie to-do value */ + +#define LTQ_SPI_IRNEN_TFI BIT(4) /* TX finished interrupt */ +#define LTQ_SPI_IRNEN_F BIT(3) /* Frame end interrupt request */ +#define LTQ_SPI_IRNEN_E BIT(2) /* Error end interrupt request */ +#define LTQ_SPI_IRNEN_T_XWAY BIT(1) /* Transmit end interrupt request */ +#define LTQ_SPI_IRNEN_R_XWAY BIT(0) /* Receive end interrupt request */ +#define LTQ_SPI_IRNEN_R_XRX BIT(1) /* Transmit end interrupt request */ +#define LTQ_SPI_IRNEN_T_XRX BIT(0) /* Receive end interrupt request */ +#define LTQ_SPI_IRNEN_ALL 0x1F + +struct lantiq_ssc_spi; + +struct lantiq_ssc_hwcfg { + int (*cfg_irq)(struct platform_device *pdev, struct lantiq_ssc_spi *spi); + unsigned int irnen_r; + unsigned int irnen_t; + unsigned int irncr; + unsigned int irnicr; + bool irq_ack; + u32 fifo_size_mask; +}; + +struct lantiq_ssc_spi { + struct spi_master *master; + struct device *dev; + void __iomem *regbase; + struct clk *spi_clk; + struct clk *fpi_clk; + const struct lantiq_ssc_hwcfg *hwcfg; + + spinlock_t lock; + struct workqueue_struct *wq; + struct work_struct work; + + const u8 *tx; + u8 *rx; + unsigned int tx_todo; + unsigned int rx_todo; + unsigned int bits_per_word; + unsigned int speed_hz; + unsigned int tx_fifo_size; + unsigned int rx_fifo_size; + unsigned int base_cs; + unsigned int fdx_tx_level; +}; + +static u32 lantiq_ssc_readl(const struct lantiq_ssc_spi *spi, u32 reg) +{ + return __raw_readl(spi->regbase + reg); +} + +static void lantiq_ssc_writel(const struct lantiq_ssc_spi *spi, u32 val, + u32 reg) +{ + __raw_writel(val, spi->regbase + reg); +} + +static void lantiq_ssc_maskl(const struct lantiq_ssc_spi *spi, u32 clr, + u32 set, u32 reg) +{ + u32 val = __raw_readl(spi->regbase + reg); + + val &= ~clr; + val |= set; + __raw_writel(val, spi->regbase + reg); +} + +static unsigned int tx_fifo_level(const struct lantiq_ssc_spi *spi) +{ + const struct lantiq_ssc_hwcfg *hwcfg = spi->hwcfg; + u32 fstat = lantiq_ssc_readl(spi, LTQ_SPI_FSTAT); + + return (fstat >> LTQ_SPI_FSTAT_TXFFL_S) & hwcfg->fifo_size_mask; +} + +static unsigned int rx_fifo_level(const struct lantiq_ssc_spi *spi) +{ + const struct lantiq_ssc_hwcfg *hwcfg = spi->hwcfg; + u32 fstat = lantiq_ssc_readl(spi, LTQ_SPI_FSTAT); + + return (fstat >> LTQ_SPI_FSTAT_RXFFL_S) & hwcfg->fifo_size_mask; +} + +static unsigned int tx_fifo_free(const struct lantiq_ssc_spi *spi) +{ + return spi->tx_fifo_size - tx_fifo_level(spi); +} + +static void rx_fifo_reset(const struct lantiq_ssc_spi *spi) +{ + u32 val = spi->rx_fifo_size << LTQ_SPI_RXFCON_RXFITL_S; + + val |= LTQ_SPI_RXFCON_RXFEN | LTQ_SPI_RXFCON_RXFLU; + lantiq_ssc_writel(spi, val, LTQ_SPI_RXFCON); +} + +static void tx_fifo_reset(const struct lantiq_ssc_spi *spi) +{ + u32 val = 1 << LTQ_SPI_TXFCON_TXFITL_S; + + val |= LTQ_SPI_TXFCON_TXFEN | LTQ_SPI_TXFCON_TXFLU; + lantiq_ssc_writel(spi, val, LTQ_SPI_TXFCON); +} + +static void rx_fifo_flush(const struct lantiq_ssc_spi *spi) +{ + lantiq_ssc_maskl(spi, 0, LTQ_SPI_RXFCON_RXFLU, LTQ_SPI_RXFCON); +} + +static void tx_fifo_flush(const struct lantiq_ssc_spi *spi) +{ + lantiq_ssc_maskl(spi, 0, LTQ_SPI_TXFCON_TXFLU, LTQ_SPI_TXFCON); +} + +static void hw_enter_config_mode(const struct lantiq_ssc_spi *spi) +{ + lantiq_ssc_writel(spi, LTQ_SPI_WHBSTATE_CLREN, LTQ_SPI_WHBSTATE); +} + +static void hw_enter_active_mode(const struct lantiq_ssc_spi *spi) +{ + lantiq_ssc_writel(spi, LTQ_SPI_WHBSTATE_SETEN, LTQ_SPI_WHBSTATE); +} + +static void hw_setup_speed_hz(const struct lantiq_ssc_spi *spi, + unsigned int max_speed_hz) +{ + u32 spi_clk, brt; + + /* + * SPI module clock is derived from FPI bus clock dependent on + * divider value in CLC.RMS which is always set to 1. + * + * f_SPI + * baudrate = -------------- + * 2 * (BR + 1) + */ + spi_clk = clk_get_rate(spi->fpi_clk) / 2; + + if (max_speed_hz > spi_clk) + brt = 0; + else + brt = spi_clk / max_speed_hz - 1; + + if (brt > 0xFFFF) + brt = 0xFFFF; + + dev_dbg(spi->dev, "spi_clk %u, max_speed_hz %u, brt %u\n", + spi_clk, max_speed_hz, brt); + + lantiq_ssc_writel(spi, brt, LTQ_SPI_BRT); +} + +static void hw_setup_bits_per_word(const struct lantiq_ssc_spi *spi, + unsigned int bits_per_word) +{ + u32 bm; + + /* CON.BM value = bits_per_word - 1 */ + bm = (bits_per_word - 1) << LTQ_SPI_CON_BM_S; + + lantiq_ssc_maskl(spi, LTQ_SPI_CON_BM_M, bm, LTQ_SPI_CON); +} + +static void hw_setup_clock_mode(const struct lantiq_ssc_spi *spi, + unsigned int mode) +{ + u32 con_set = 0, con_clr = 0; + + /* + * SPI mode mapping in CON register: + * Mode CPOL CPHA CON.PO CON.PH + * 0 0 0 0 1 + * 1 0 1 0 0 + * 2 1 0 1 1 + * 3 1 1 1 0 + */ + if (mode & SPI_CPHA) + con_clr |= LTQ_SPI_CON_PH; + else + con_set |= LTQ_SPI_CON_PH; + + if (mode & SPI_CPOL) + con_set |= LTQ_SPI_CON_PO | LTQ_SPI_CON_IDLE; + else + con_clr |= LTQ_SPI_CON_PO | LTQ_SPI_CON_IDLE; + + /* Set heading control */ + if (mode & SPI_LSB_FIRST) + con_clr |= LTQ_SPI_CON_HB; + else + con_set |= LTQ_SPI_CON_HB; + + /* Set loopback mode */ + if (mode & SPI_LOOP) + con_set |= LTQ_SPI_CON_LB; + else + con_clr |= LTQ_SPI_CON_LB; + + lantiq_ssc_maskl(spi, con_clr, con_set, LTQ_SPI_CON); +} + +static void lantiq_ssc_hw_init(const struct lantiq_ssc_spi *spi) +{ + const struct lantiq_ssc_hwcfg *hwcfg = spi->hwcfg; + + /* + * Set clock divider for run mode to 1 to + * run at same frequency as FPI bus + */ + lantiq_ssc_writel(spi, 1 << LTQ_SPI_CLC_RMC_S, LTQ_SPI_CLC); + + /* Put controller into config mode */ + hw_enter_config_mode(spi); + + /* Clear error flags */ + lantiq_ssc_maskl(spi, 0, LTQ_SPI_WHBSTATE_CLR_ERRORS, LTQ_SPI_WHBSTATE); + + /* Enable error checking, disable TX/RX */ + lantiq_ssc_writel(spi, LTQ_SPI_CON_RUEN | LTQ_SPI_CON_AEN | + LTQ_SPI_CON_TEN | LTQ_SPI_CON_REN | LTQ_SPI_CON_TXOFF | + LTQ_SPI_CON_RXOFF, LTQ_SPI_CON); + + /* Setup default SPI mode */ + hw_setup_bits_per_word(spi, spi->bits_per_word); + hw_setup_clock_mode(spi, SPI_MODE_0); + + /* Enable master mode and clear error flags */ + lantiq_ssc_writel(spi, LTQ_SPI_WHBSTATE_SETMS | + LTQ_SPI_WHBSTATE_CLR_ERRORS, + LTQ_SPI_WHBSTATE); + + /* Reset GPIO/CS registers */ + lantiq_ssc_writel(spi, 0, LTQ_SPI_GPOCON); + lantiq_ssc_writel(spi, 0xFF00, LTQ_SPI_FPGO); + + /* Enable and flush FIFOs */ + rx_fifo_reset(spi); + tx_fifo_reset(spi); + + /* Enable interrupts */ + lantiq_ssc_writel(spi, hwcfg->irnen_t | hwcfg->irnen_r | + LTQ_SPI_IRNEN_E, LTQ_SPI_IRNEN); +} + +static int lantiq_ssc_setup(struct spi_device *spidev) +{ + struct spi_master *master = spidev->master; + struct lantiq_ssc_spi *spi = spi_master_get_devdata(master); + unsigned int cs = spidev->chip_select; + u32 gpocon; + + /* GPIOs are used for CS */ + if (spidev->cs_gpiod) + return 0; + + dev_dbg(spi->dev, "using internal chipselect %u\n", cs); + + if (cs < spi->base_cs) { + dev_err(spi->dev, + "chipselect %i too small (min %i)\n", cs, spi->base_cs); + return -EINVAL; + } + + /* set GPO pin to CS mode */ + gpocon = 1 << ((cs - spi->base_cs) + LTQ_SPI_GPOCON_ISCSBN_S); + + /* invert GPO pin */ + if (spidev->mode & SPI_CS_HIGH) + gpocon |= 1 << (cs - spi->base_cs); + + lantiq_ssc_maskl(spi, 0, gpocon, LTQ_SPI_GPOCON); + + return 0; +} + +static int lantiq_ssc_prepare_message(struct spi_master *master, + struct spi_message *message) +{ + struct lantiq_ssc_spi *spi = spi_master_get_devdata(master); + + hw_enter_config_mode(spi); + hw_setup_clock_mode(spi, message->spi->mode); + hw_enter_active_mode(spi); + + return 0; +} + +static void hw_setup_transfer(struct lantiq_ssc_spi *spi, + struct spi_device *spidev, struct spi_transfer *t) +{ + unsigned int speed_hz = t->speed_hz; + unsigned int bits_per_word = t->bits_per_word; + u32 con; + + if (bits_per_word != spi->bits_per_word || + speed_hz != spi->speed_hz) { + hw_enter_config_mode(spi); + hw_setup_speed_hz(spi, speed_hz); + hw_setup_bits_per_word(spi, bits_per_word); + hw_enter_active_mode(spi); + + spi->speed_hz = speed_hz; + spi->bits_per_word = bits_per_word; + } + + /* Configure transmitter and receiver */ + con = lantiq_ssc_readl(spi, LTQ_SPI_CON); + if (t->tx_buf) + con &= ~LTQ_SPI_CON_TXOFF; + else + con |= LTQ_SPI_CON_TXOFF; + + if (t->rx_buf) + con &= ~LTQ_SPI_CON_RXOFF; + else + con |= LTQ_SPI_CON_RXOFF; + + lantiq_ssc_writel(spi, con, LTQ_SPI_CON); +} + +static int lantiq_ssc_unprepare_message(struct spi_master *master, + struct spi_message *message) +{ + struct lantiq_ssc_spi *spi = spi_master_get_devdata(master); + + flush_workqueue(spi->wq); + + /* Disable transmitter and receiver while idle */ + lantiq_ssc_maskl(spi, 0, LTQ_SPI_CON_TXOFF | LTQ_SPI_CON_RXOFF, + LTQ_SPI_CON); + + return 0; +} + +static void tx_fifo_write(struct lantiq_ssc_spi *spi) +{ + const u8 *tx8; + const u16 *tx16; + const u32 *tx32; + u32 data; + unsigned int tx_free = tx_fifo_free(spi); + + spi->fdx_tx_level = 0; + while (spi->tx_todo && tx_free) { + switch (spi->bits_per_word) { + case 2 ... 8: + tx8 = spi->tx; + data = *tx8; + spi->tx_todo--; + spi->tx++; + break; + case 16: + tx16 = (u16 *) spi->tx; + data = *tx16; + spi->tx_todo -= 2; + spi->tx += 2; + break; + case 32: + tx32 = (u32 *) spi->tx; + data = *tx32; + spi->tx_todo -= 4; + spi->tx += 4; + break; + default: + WARN_ON(1); + data = 0; + break; + } + + lantiq_ssc_writel(spi, data, LTQ_SPI_TB); + tx_free--; + spi->fdx_tx_level++; + } +} + +static void rx_fifo_read_full_duplex(struct lantiq_ssc_spi *spi) +{ + u8 *rx8; + u16 *rx16; + u32 *rx32; + u32 data; + unsigned int rx_fill = rx_fifo_level(spi); + + /* + * Wait until all expected data to be shifted in. + * Otherwise, rx overrun may occur. + */ + while (rx_fill != spi->fdx_tx_level) + rx_fill = rx_fifo_level(spi); + + while (rx_fill) { + data = lantiq_ssc_readl(spi, LTQ_SPI_RB); + + switch (spi->bits_per_word) { + case 2 ... 8: + rx8 = spi->rx; + *rx8 = data; + spi->rx_todo--; + spi->rx++; + break; + case 16: + rx16 = (u16 *) spi->rx; + *rx16 = data; + spi->rx_todo -= 2; + spi->rx += 2; + break; + case 32: + rx32 = (u32 *) spi->rx; + *rx32 = data; + spi->rx_todo -= 4; + spi->rx += 4; + break; + default: + WARN_ON(1); + break; + } + + rx_fill--; + } +} + +static void rx_fifo_read_half_duplex(struct lantiq_ssc_spi *spi) +{ + u32 data, *rx32; + u8 *rx8; + unsigned int rxbv, shift; + unsigned int rx_fill = rx_fifo_level(spi); + + /* + * In RX-only mode the bits per word value is ignored by HW. A value + * of 32 is used instead. Thus all 4 bytes per FIFO must be read. + * If remaining RX bytes are less than 4, the FIFO must be read + * differently. The amount of received and valid bytes is indicated + * by STAT.RXBV register value. + */ + while (rx_fill) { + if (spi->rx_todo < 4) { + rxbv = (lantiq_ssc_readl(spi, LTQ_SPI_STAT) & + LTQ_SPI_STAT_RXBV_M) >> LTQ_SPI_STAT_RXBV_S; + data = lantiq_ssc_readl(spi, LTQ_SPI_RB); + + shift = (rxbv - 1) * 8; + rx8 = spi->rx; + + while (rxbv) { + *rx8++ = (data >> shift) & 0xFF; + rxbv--; + shift -= 8; + spi->rx_todo--; + spi->rx++; + } + } else { + data = lantiq_ssc_readl(spi, LTQ_SPI_RB); + rx32 = (u32 *) spi->rx; + + *rx32++ = data; + spi->rx_todo -= 4; + spi->rx += 4; + } + rx_fill--; + } +} + +static void rx_request(struct lantiq_ssc_spi *spi) +{ + unsigned int rxreq, rxreq_max; + + /* + * To avoid receive overflows at high clocks it is better to request + * only the amount of bytes that fits into all FIFOs. This value + * depends on the FIFO size implemented in hardware. + */ + rxreq = spi->rx_todo; + rxreq_max = spi->rx_fifo_size * 4; + if (rxreq > rxreq_max) + rxreq = rxreq_max; + + lantiq_ssc_writel(spi, rxreq, LTQ_SPI_RXREQ); +} + +static irqreturn_t lantiq_ssc_xmit_interrupt(int irq, void *data) +{ + struct lantiq_ssc_spi *spi = data; + const struct lantiq_ssc_hwcfg *hwcfg = spi->hwcfg; + u32 val = lantiq_ssc_readl(spi, hwcfg->irncr); + + spin_lock(&spi->lock); + if (hwcfg->irq_ack) + lantiq_ssc_writel(spi, val, hwcfg->irncr); + + if (spi->tx) { + if (spi->rx && spi->rx_todo) + rx_fifo_read_full_duplex(spi); + + if (spi->tx_todo) + tx_fifo_write(spi); + else if (!tx_fifo_level(spi)) + goto completed; + } else if (spi->rx) { + if (spi->rx_todo) { + rx_fifo_read_half_duplex(spi); + + if (spi->rx_todo) + rx_request(spi); + else + goto completed; + } else { + goto completed; + } + } + + spin_unlock(&spi->lock); + return IRQ_HANDLED; + +completed: + queue_work(spi->wq, &spi->work); + spin_unlock(&spi->lock); + + return IRQ_HANDLED; +} + +static irqreturn_t lantiq_ssc_err_interrupt(int irq, void *data) +{ + struct lantiq_ssc_spi *spi = data; + const struct lantiq_ssc_hwcfg *hwcfg = spi->hwcfg; + u32 stat = lantiq_ssc_readl(spi, LTQ_SPI_STAT); + u32 val = lantiq_ssc_readl(spi, hwcfg->irncr); + + if (!(stat & LTQ_SPI_STAT_ERRORS)) + return IRQ_NONE; + + spin_lock(&spi->lock); + if (hwcfg->irq_ack) + lantiq_ssc_writel(spi, val, hwcfg->irncr); + + if (stat & LTQ_SPI_STAT_RUE) + dev_err(spi->dev, "receive underflow error\n"); + if (stat & LTQ_SPI_STAT_TUE) + dev_err(spi->dev, "transmit underflow error\n"); + if (stat & LTQ_SPI_STAT_AE) + dev_err(spi->dev, "abort error\n"); + if (stat & LTQ_SPI_STAT_RE) + dev_err(spi->dev, "receive overflow error\n"); + if (stat & LTQ_SPI_STAT_TE) + dev_err(spi->dev, "transmit overflow error\n"); + if (stat & LTQ_SPI_STAT_ME) + dev_err(spi->dev, "mode error\n"); + + /* Clear error flags */ + lantiq_ssc_maskl(spi, 0, LTQ_SPI_WHBSTATE_CLR_ERRORS, LTQ_SPI_WHBSTATE); + + /* set bad status so it can be retried */ + if (spi->master->cur_msg) + spi->master->cur_msg->status = -EIO; + queue_work(spi->wq, &spi->work); + spin_unlock(&spi->lock); + + return IRQ_HANDLED; +} + +static irqreturn_t intel_lgm_ssc_isr(int irq, void *data) +{ + struct lantiq_ssc_spi *spi = data; + const struct lantiq_ssc_hwcfg *hwcfg = spi->hwcfg; + u32 val = lantiq_ssc_readl(spi, hwcfg->irncr); + + if (!(val & LTQ_SPI_IRNEN_ALL)) + return IRQ_NONE; + + if (val & LTQ_SPI_IRNEN_E) + return lantiq_ssc_err_interrupt(irq, data); + + if ((val & hwcfg->irnen_t) || (val & hwcfg->irnen_r)) + return lantiq_ssc_xmit_interrupt(irq, data); + + return IRQ_HANDLED; +} + +static int transfer_start(struct lantiq_ssc_spi *spi, struct spi_device *spidev, + struct spi_transfer *t) +{ + unsigned long flags; + + spin_lock_irqsave(&spi->lock, flags); + + spi->tx = t->tx_buf; + spi->rx = t->rx_buf; + + if (t->tx_buf) { + spi->tx_todo = t->len; + + /* initially fill TX FIFO */ + tx_fifo_write(spi); + } + + if (spi->rx) { + spi->rx_todo = t->len; + + /* start shift clock in RX-only mode */ + if (!spi->tx) + rx_request(spi); + } + + spin_unlock_irqrestore(&spi->lock, flags); + + return t->len; +} + +/* + * The driver only gets an interrupt when the FIFO is empty, but there + * is an additional shift register from which the data is written to + * the wire. We get the last interrupt when the controller starts to + * write the last word to the wire, not when it is finished. Do busy + * waiting till it finishes. + */ +static void lantiq_ssc_bussy_work(struct work_struct *work) +{ + struct lantiq_ssc_spi *spi; + unsigned long long timeout = 8LL * 1000LL; + unsigned long end; + + spi = container_of(work, typeof(*spi), work); + + do_div(timeout, spi->speed_hz); + timeout += timeout + 100; /* some tolerance */ + + end = jiffies + msecs_to_jiffies(timeout); + do { + u32 stat = lantiq_ssc_readl(spi, LTQ_SPI_STAT); + + if (!(stat & LTQ_SPI_STAT_BSY)) { + spi_finalize_current_transfer(spi->master); + return; + } + + cond_resched(); + } while (!time_after_eq(jiffies, end)); + + if (spi->master->cur_msg) + spi->master->cur_msg->status = -EIO; + spi_finalize_current_transfer(spi->master); +} + +static void lantiq_ssc_handle_err(struct spi_master *master, + struct spi_message *message) +{ + struct lantiq_ssc_spi *spi = spi_master_get_devdata(master); + + /* flush FIFOs on timeout */ + rx_fifo_flush(spi); + tx_fifo_flush(spi); +} + +static void lantiq_ssc_set_cs(struct spi_device *spidev, bool enable) +{ + struct lantiq_ssc_spi *spi = spi_master_get_devdata(spidev->master); + unsigned int cs = spidev->chip_select; + u32 fgpo; + + if (!!(spidev->mode & SPI_CS_HIGH) == enable) + fgpo = (1 << (cs - spi->base_cs)); + else + fgpo = (1 << (cs - spi->base_cs + LTQ_SPI_FGPO_SETOUTN_S)); + + lantiq_ssc_writel(spi, fgpo, LTQ_SPI_FPGO); +} + +static int lantiq_ssc_transfer_one(struct spi_master *master, + struct spi_device *spidev, + struct spi_transfer *t) +{ + struct lantiq_ssc_spi *spi = spi_master_get_devdata(master); + + hw_setup_transfer(spi, spidev, t); + + return transfer_start(spi, spidev, t); +} + +static int intel_lgm_cfg_irq(struct platform_device *pdev, struct lantiq_ssc_spi *spi) +{ + int irq; + + irq = platform_get_irq(pdev, 0); + if (irq < 0) + return irq; + + return devm_request_irq(&pdev->dev, irq, intel_lgm_ssc_isr, 0, "spi", spi); +} + +static int lantiq_cfg_irq(struct platform_device *pdev, struct lantiq_ssc_spi *spi) +{ + int irq, err; + + irq = platform_get_irq_byname(pdev, LTQ_SPI_RX_IRQ_NAME); + if (irq < 0) + return irq; + + err = devm_request_irq(&pdev->dev, irq, lantiq_ssc_xmit_interrupt, + 0, LTQ_SPI_RX_IRQ_NAME, spi); + if (err) + return err; + + irq = platform_get_irq_byname(pdev, LTQ_SPI_TX_IRQ_NAME); + if (irq < 0) + return irq; + + err = devm_request_irq(&pdev->dev, irq, lantiq_ssc_xmit_interrupt, + 0, LTQ_SPI_TX_IRQ_NAME, spi); + + if (err) + return err; + + irq = platform_get_irq_byname(pdev, LTQ_SPI_ERR_IRQ_NAME); + if (irq < 0) + return irq; + + err = devm_request_irq(&pdev->dev, irq, lantiq_ssc_err_interrupt, + 0, LTQ_SPI_ERR_IRQ_NAME, spi); + return err; +} + +static const struct lantiq_ssc_hwcfg lantiq_ssc_xway = { + .cfg_irq = lantiq_cfg_irq, + .irnen_r = LTQ_SPI_IRNEN_R_XWAY, + .irnen_t = LTQ_SPI_IRNEN_T_XWAY, + .irnicr = 0xF8, + .irncr = 0xFC, + .fifo_size_mask = GENMASK(5, 0), + .irq_ack = false, +}; + +static const struct lantiq_ssc_hwcfg lantiq_ssc_xrx = { + .cfg_irq = lantiq_cfg_irq, + .irnen_r = LTQ_SPI_IRNEN_R_XRX, + .irnen_t = LTQ_SPI_IRNEN_T_XRX, + .irnicr = 0xF8, + .irncr = 0xFC, + .fifo_size_mask = GENMASK(5, 0), + .irq_ack = false, +}; + +static const struct lantiq_ssc_hwcfg intel_ssc_lgm = { + .cfg_irq = intel_lgm_cfg_irq, + .irnen_r = LTQ_SPI_IRNEN_R_XRX, + .irnen_t = LTQ_SPI_IRNEN_T_XRX, + .irnicr = 0xFC, + .irncr = 0xF8, + .fifo_size_mask = GENMASK(7, 0), + .irq_ack = true, +}; + +static const struct of_device_id lantiq_ssc_match[] = { + { .compatible = "lantiq,ase-spi", .data = &lantiq_ssc_xway, }, + { .compatible = "lantiq,falcon-spi", .data = &lantiq_ssc_xrx, }, + { .compatible = "lantiq,xrx100-spi", .data = &lantiq_ssc_xrx, }, + { .compatible = "intel,lgm-spi", .data = &intel_ssc_lgm, }, + {}, +}; +MODULE_DEVICE_TABLE(of, lantiq_ssc_match); + +static int lantiq_ssc_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct spi_master *master; + struct lantiq_ssc_spi *spi; + const struct lantiq_ssc_hwcfg *hwcfg; + const struct of_device_id *match; + u32 id, supports_dma, revision; + unsigned int num_cs; + int err; + + match = of_match_device(lantiq_ssc_match, dev); + if (!match) { + dev_err(dev, "no device match\n"); + return -EINVAL; + } + hwcfg = match->data; + + master = spi_alloc_master(dev, sizeof(struct lantiq_ssc_spi)); + if (!master) + return -ENOMEM; + + spi = spi_master_get_devdata(master); + spi->master = master; + spi->dev = dev; + spi->hwcfg = hwcfg; + platform_set_drvdata(pdev, spi); + spi->regbase = devm_platform_ioremap_resource(pdev, 0); + if (IS_ERR(spi->regbase)) { + err = PTR_ERR(spi->regbase); + goto err_master_put; + } + + err = hwcfg->cfg_irq(pdev, spi); + if (err) + goto err_master_put; + + spi->spi_clk = devm_clk_get(dev, "gate"); + if (IS_ERR(spi->spi_clk)) { + err = PTR_ERR(spi->spi_clk); + goto err_master_put; + } + err = clk_prepare_enable(spi->spi_clk); + if (err) + goto err_master_put; + + /* + * Use the old clk_get_fpi() function on Lantiq platform, till it + * supports common clk. + */ +#if defined(CONFIG_LANTIQ) && !defined(CONFIG_COMMON_CLK) + spi->fpi_clk = clk_get_fpi(); +#else + spi->fpi_clk = clk_get(dev, "freq"); +#endif + if (IS_ERR(spi->fpi_clk)) { + err = PTR_ERR(spi->fpi_clk); + goto err_clk_disable; + } + + num_cs = 8; + of_property_read_u32(pdev->dev.of_node, "num-cs", &num_cs); + + spi->base_cs = 1; + of_property_read_u32(pdev->dev.of_node, "base-cs", &spi->base_cs); + + spin_lock_init(&spi->lock); + spi->bits_per_word = 8; + spi->speed_hz = 0; + + master->dev.of_node = pdev->dev.of_node; + master->num_chipselect = num_cs; + master->use_gpio_descriptors = true; + master->setup = lantiq_ssc_setup; + master->set_cs = lantiq_ssc_set_cs; + master->handle_err = lantiq_ssc_handle_err; + master->prepare_message = lantiq_ssc_prepare_message; + master->unprepare_message = lantiq_ssc_unprepare_message; + master->transfer_one = lantiq_ssc_transfer_one; + master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_LSB_FIRST | SPI_CS_HIGH | + SPI_LOOP; + master->bits_per_word_mask = SPI_BPW_RANGE_MASK(2, 8) | + SPI_BPW_MASK(16) | SPI_BPW_MASK(32); + + spi->wq = alloc_ordered_workqueue(dev_name(dev), WQ_MEM_RECLAIM); + if (!spi->wq) { + err = -ENOMEM; + goto err_clk_put; + } + INIT_WORK(&spi->work, lantiq_ssc_bussy_work); + + id = lantiq_ssc_readl(spi, LTQ_SPI_ID); + spi->tx_fifo_size = (id >> LTQ_SPI_ID_TXFS_S) & hwcfg->fifo_size_mask; + spi->rx_fifo_size = (id >> LTQ_SPI_ID_RXFS_S) & hwcfg->fifo_size_mask; + supports_dma = (id & LTQ_SPI_ID_CFG_M) >> LTQ_SPI_ID_CFG_S; + revision = id & LTQ_SPI_ID_REV_M; + + lantiq_ssc_hw_init(spi); + + dev_info(dev, + "Lantiq SSC SPI controller (Rev %i, TXFS %u, RXFS %u, DMA %u)\n", + revision, spi->tx_fifo_size, spi->rx_fifo_size, supports_dma); + + err = devm_spi_register_master(dev, master); + if (err) { + dev_err(dev, "failed to register spi_master\n"); + goto err_wq_destroy; + } + + return 0; + +err_wq_destroy: + destroy_workqueue(spi->wq); +err_clk_put: + clk_put(spi->fpi_clk); +err_clk_disable: + clk_disable_unprepare(spi->spi_clk); +err_master_put: + spi_master_put(master); + + return err; +} + +static int lantiq_ssc_remove(struct platform_device *pdev) +{ + struct lantiq_ssc_spi *spi = platform_get_drvdata(pdev); + + lantiq_ssc_writel(spi, 0, LTQ_SPI_IRNEN); + lantiq_ssc_writel(spi, 0, LTQ_SPI_CLC); + rx_fifo_flush(spi); + tx_fifo_flush(spi); + hw_enter_config_mode(spi); + + destroy_workqueue(spi->wq); + clk_disable_unprepare(spi->spi_clk); + clk_put(spi->fpi_clk); + + return 0; +} + +static struct platform_driver lantiq_ssc_driver = { + .probe = lantiq_ssc_probe, + .remove = lantiq_ssc_remove, + .driver = { + .name = "spi-lantiq-ssc", + .of_match_table = lantiq_ssc_match, + }, +}; +module_platform_driver(lantiq_ssc_driver); + +MODULE_DESCRIPTION("Lantiq SSC SPI controller driver"); +MODULE_AUTHOR("Daniel Schwierzeck <daniel.schwierzeck@gmail.com>"); +MODULE_AUTHOR("Hauke Mehrtens <hauke@hauke-m.de>"); +MODULE_LICENSE("GPL"); +MODULE_ALIAS("platform:spi-lantiq-ssc"); diff --git a/drivers/spi/spi-lm70llp.c b/drivers/spi/spi-lm70llp.c new file mode 100644 index 000000000..174dba29b --- /dev/null +++ b/drivers/spi/spi-lm70llp.c @@ -0,0 +1,339 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Driver for LM70EVAL-LLP board for the LM70 sensor + * + * Copyright (C) 2006 Kaiwan N Billimoria <kaiwan@designergraphix.com> + */ + +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt + +#include <linux/init.h> +#include <linux/module.h> +#include <linux/kernel.h> +#include <linux/delay.h> +#include <linux/device.h> +#include <linux/parport.h> +#include <linux/sysfs.h> +#include <linux/workqueue.h> + +#include <linux/spi/spi.h> +#include <linux/spi/spi_bitbang.h> + +/* + * The LM70 communicates with a host processor using a 3-wire variant of + * the SPI/Microwire bus interface. This driver specifically supports an + * NS LM70 LLP Evaluation Board, interfacing to a PC using its parallel + * port to bitbang an SPI-parport bridge. Accordingly, this is an SPI + * master controller driver. The hwmon/lm70 driver is a "SPI protocol + * driver", layered on top of this one and usable without the lm70llp. + * + * Datasheet and Schematic: + * The LM70 is a temperature sensor chip from National Semiconductor; its + * datasheet is available at http://www.national.com/pf/LM/LM70.html + * The schematic for this particular board (the LM70EVAL-LLP) is + * available (on page 4) here: + * http://www.national.com/appinfo/tempsensors/files/LM70LLPEVALmanual.pdf + * + * Also see Documentation/spi/spi-lm70llp.rst. The SPI<->parport code here is + * (heavily) based on spi-butterfly by David Brownell. + * + * The LM70 LLP connects to the PC parallel port in the following manner: + * + * Parallel LM70 LLP + * Port Direction JP2 Header + * ----------- --------- ------------ + * D0 2 - - + * D1 3 --> V+ 5 + * D2 4 --> V+ 5 + * D3 5 --> V+ 5 + * D4 6 --> V+ 5 + * D5 7 --> nCS 8 + * D6 8 --> SCLK 3 + * D7 9 --> SI/O 5 + * GND 25 - GND 7 + * Select 13 <-- SI/O 1 + * + * Note that parport pin 13 actually gets inverted by the transistor + * arrangement which lets either the parport or the LM70 drive the + * SI/SO signal (see the schematic for details). + */ + +#define DRVNAME "spi-lm70llp" + +#define lm70_INIT 0xBE +#define SIO 0x10 +#define nCS 0x20 +#define SCLK 0x40 + +/*-------------------------------------------------------------------------*/ + +struct spi_lm70llp { + struct spi_bitbang bitbang; + struct parport *port; + struct pardevice *pd; + struct spi_device *spidev_lm70; + struct spi_board_info info; + //struct device *dev; +}; + +/* REVISIT : ugly global ; provides "exclusive open" facility */ +static struct spi_lm70llp *lm70llp; + +/*-------------------------------------------------------------------*/ + +static inline struct spi_lm70llp *spidev_to_pp(struct spi_device *spi) +{ + return spi->controller_data; +} + +/*---------------------- LM70 LLP eval board-specific inlines follow */ + +/* NOTE: we don't actually need to reread the output values, since they'll + * still be what we wrote before. Plus, going through parport builds in + * a ~1ms/operation delay; these SPI transfers could easily be faster. + */ + +static inline void deassertCS(struct spi_lm70llp *pp) +{ + u8 data = parport_read_data(pp->port); + + data &= ~0x80; /* pull D7/SI-out low while de-asserted */ + parport_write_data(pp->port, data | nCS); +} + +static inline void assertCS(struct spi_lm70llp *pp) +{ + u8 data = parport_read_data(pp->port); + + data |= 0x80; /* pull D7/SI-out high so lm70 drives SO-in */ + parport_write_data(pp->port, data & ~nCS); +} + +static inline void clkHigh(struct spi_lm70llp *pp) +{ + u8 data = parport_read_data(pp->port); + + parport_write_data(pp->port, data | SCLK); +} + +static inline void clkLow(struct spi_lm70llp *pp) +{ + u8 data = parport_read_data(pp->port); + + parport_write_data(pp->port, data & ~SCLK); +} + +/*------------------------- SPI-LM70-specific inlines ----------------------*/ + +static inline void spidelay(unsigned d) +{ + udelay(d); +} + +static inline void setsck(struct spi_device *s, int is_on) +{ + struct spi_lm70llp *pp = spidev_to_pp(s); + + if (is_on) + clkHigh(pp); + else + clkLow(pp); +} + +static inline void setmosi(struct spi_device *s, int is_on) +{ + /* FIXME update D7 ... this way we can put the chip + * into shutdown mode and read the manufacturer ID, + * but we can't put it back into operational mode. + */ +} + +/* + * getmiso: + * Why do we return 0 when the SIO line is high and vice-versa? + * The fact is, the lm70 eval board from NS (which this driver drives), + * is wired in just such a way : when the lm70's SIO goes high, a transistor + * switches it to low reflecting this on the parport (pin 13), and vice-versa. + */ +static inline int getmiso(struct spi_device *s) +{ + struct spi_lm70llp *pp = spidev_to_pp(s); + + return ((SIO == (parport_read_status(pp->port) & SIO)) ? 0 : 1); +} + +/*--------------------------------------------------------------------*/ + +#include "spi-bitbang-txrx.h" + +static void lm70_chipselect(struct spi_device *spi, int value) +{ + struct spi_lm70llp *pp = spidev_to_pp(spi); + + if (value) + assertCS(pp); + else + deassertCS(pp); +} + +/* + * Our actual bitbanger routine. + */ +static u32 lm70_txrx(struct spi_device *spi, unsigned nsecs, u32 word, u8 bits, + unsigned flags) +{ + return bitbang_txrx_be_cpha0(spi, nsecs, 0, flags, word, bits); +} + +static void spi_lm70llp_attach(struct parport *p) +{ + struct pardevice *pd; + struct spi_lm70llp *pp; + struct spi_master *master; + int status; + struct pardev_cb lm70llp_cb; + + if (lm70llp) { + pr_warn("spi_lm70llp instance already loaded. Aborting.\n"); + return; + } + + /* TODO: this just _assumes_ a lm70 is there ... no probe; + * the lm70 driver could verify it, reading the manf ID. + */ + + master = spi_alloc_master(p->physport->dev, sizeof *pp); + if (!master) { + status = -ENOMEM; + goto out_fail; + } + pp = spi_master_get_devdata(master); + + /* + * SPI and bitbang hookup. + */ + pp->bitbang.master = master; + pp->bitbang.chipselect = lm70_chipselect; + pp->bitbang.txrx_word[SPI_MODE_0] = lm70_txrx; + pp->bitbang.flags = SPI_3WIRE; + + /* + * Parport hookup + */ + pp->port = p; + memset(&lm70llp_cb, 0, sizeof(lm70llp_cb)); + lm70llp_cb.private = pp; + lm70llp_cb.flags = PARPORT_FLAG_EXCL; + pd = parport_register_dev_model(p, DRVNAME, &lm70llp_cb, 0); + + if (!pd) { + status = -ENOMEM; + goto out_free_master; + } + pp->pd = pd; + + status = parport_claim(pd); + if (status < 0) + goto out_parport_unreg; + + /* + * Start SPI ... + */ + status = spi_bitbang_start(&pp->bitbang); + if (status < 0) { + dev_warn(&pd->dev, "spi_bitbang_start failed with status %d\n", + status); + goto out_off_and_release; + } + + /* + * The modalias name MUST match the device_driver name + * for the bus glue code to match and subsequently bind them. + * We are binding to the generic drivers/hwmon/lm70.c device + * driver. + */ + strcpy(pp->info.modalias, "lm70"); + pp->info.max_speed_hz = 6 * 1000 * 1000; + pp->info.chip_select = 0; + pp->info.mode = SPI_3WIRE | SPI_MODE_0; + + /* power up the chip, and let the LM70 control SI/SO */ + parport_write_data(pp->port, lm70_INIT); + + /* Enable access to our primary data structure via + * the board info's (void *)controller_data. + */ + pp->info.controller_data = pp; + pp->spidev_lm70 = spi_new_device(pp->bitbang.master, &pp->info); + if (pp->spidev_lm70) + dev_dbg(&pp->spidev_lm70->dev, "spidev_lm70 at %s\n", + dev_name(&pp->spidev_lm70->dev)); + else { + dev_warn(&pd->dev, "spi_new_device failed\n"); + status = -ENODEV; + goto out_bitbang_stop; + } + pp->spidev_lm70->bits_per_word = 8; + + lm70llp = pp; + return; + +out_bitbang_stop: + spi_bitbang_stop(&pp->bitbang); +out_off_and_release: + /* power down */ + parport_write_data(pp->port, 0); + mdelay(10); + parport_release(pp->pd); +out_parport_unreg: + parport_unregister_device(pd); +out_free_master: + spi_master_put(master); +out_fail: + pr_info("spi_lm70llp probe fail, status %d\n", status); +} + +static void spi_lm70llp_detach(struct parport *p) +{ + struct spi_lm70llp *pp; + + if (!lm70llp || lm70llp->port != p) + return; + + pp = lm70llp; + spi_bitbang_stop(&pp->bitbang); + + /* power down */ + parport_write_data(pp->port, 0); + + parport_release(pp->pd); + parport_unregister_device(pp->pd); + + spi_master_put(pp->bitbang.master); + + lm70llp = NULL; +} + +static struct parport_driver spi_lm70llp_drv = { + .name = DRVNAME, + .match_port = spi_lm70llp_attach, + .detach = spi_lm70llp_detach, + .devmodel = true, +}; + +static int __init init_spi_lm70llp(void) +{ + return parport_register_driver(&spi_lm70llp_drv); +} +module_init(init_spi_lm70llp); + +static void __exit cleanup_spi_lm70llp(void) +{ + parport_unregister_driver(&spi_lm70llp_drv); +} +module_exit(cleanup_spi_lm70llp); + +MODULE_AUTHOR("Kaiwan N Billimoria <kaiwan@designergraphix.com>"); +MODULE_DESCRIPTION( + "Parport adapter for the National Semiconductor LM70 LLP eval board"); +MODULE_LICENSE("GPL"); diff --git a/drivers/spi/spi-loopback-test.c b/drivers/spi/spi-loopback-test.c new file mode 100644 index 000000000..4d4f77a18 --- /dev/null +++ b/drivers/spi/spi-loopback-test.c @@ -0,0 +1,1084 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * linux/drivers/spi/spi-loopback-test.c + * + * (c) Martin Sperl <kernel@martin.sperl.org> + * + * Loopback test driver to test several typical spi_message conditions + * that a spi_master driver may encounter + * this can also get used for regression testing + */ + +#include <linux/delay.h> +#include <linux/kernel.h> +#include <linux/ktime.h> +#include <linux/list.h> +#include <linux/list_sort.h> +#include <linux/module.h> +#include <linux/of_device.h> +#include <linux/printk.h> +#include <linux/vmalloc.h> +#include <linux/spi/spi.h> + +#include "spi-test.h" + +/* flag to only simulate transfers */ +static int simulate_only; +module_param(simulate_only, int, 0); +MODULE_PARM_DESC(simulate_only, "if not 0 do not execute the spi message"); + +/* dump spi messages */ +static int dump_messages; +module_param(dump_messages, int, 0); +MODULE_PARM_DESC(dump_messages, + "=1 dump the basic spi_message_structure, " \ + "=2 dump the spi_message_structure including data, " \ + "=3 dump the spi_message structure before and after execution"); +/* the device is jumpered for loopback - enabling some rx_buf tests */ +static int loopback; +module_param(loopback, int, 0); +MODULE_PARM_DESC(loopback, + "if set enable loopback mode, where the rx_buf " \ + "is checked to match tx_buf after the spi_message " \ + "is executed"); + +static int loop_req; +module_param(loop_req, int, 0); +MODULE_PARM_DESC(loop_req, + "if set controller will be asked to enable test loop mode. " \ + "If controller supported it, MISO and MOSI will be connected"); + +static int no_cs; +module_param(no_cs, int, 0); +MODULE_PARM_DESC(no_cs, + "if set Chip Select (CS) will not be used"); + +/* run only a specific test */ +static int run_only_test = -1; +module_param(run_only_test, int, 0); +MODULE_PARM_DESC(run_only_test, + "only run the test with this number (0-based !)"); + +/* use vmalloc'ed buffers */ +static int use_vmalloc; +module_param(use_vmalloc, int, 0644); +MODULE_PARM_DESC(use_vmalloc, + "use vmalloc'ed buffers instead of kmalloc'ed"); + +/* check rx ranges */ +static int check_ranges = 1; +module_param(check_ranges, int, 0644); +MODULE_PARM_DESC(check_ranges, + "checks rx_buffer pattern are valid"); + +/* the actual tests to execute */ +static struct spi_test spi_tests[] = { + { + .description = "tx/rx-transfer - start of page", + .fill_option = FILL_COUNT_8, + .iterate_len = { ITERATE_MAX_LEN }, + .iterate_tx_align = ITERATE_ALIGN, + .iterate_rx_align = ITERATE_ALIGN, + .transfer_count = 1, + .transfers = { + { + .tx_buf = TX(0), + .rx_buf = RX(0), + }, + }, + }, + { + .description = "tx/rx-transfer - crossing PAGE_SIZE", + .fill_option = FILL_COUNT_8, + .iterate_len = { ITERATE_LEN }, + .iterate_tx_align = ITERATE_ALIGN, + .iterate_rx_align = ITERATE_ALIGN, + .transfer_count = 1, + .transfers = { + { + .tx_buf = TX(PAGE_SIZE - 4), + .rx_buf = RX(PAGE_SIZE - 4), + }, + }, + }, + { + .description = "tx-transfer - only", + .fill_option = FILL_COUNT_8, + .iterate_len = { ITERATE_MAX_LEN }, + .iterate_tx_align = ITERATE_ALIGN, + .transfer_count = 1, + .transfers = { + { + .tx_buf = TX(0), + }, + }, + }, + { + .description = "rx-transfer - only", + .fill_option = FILL_COUNT_8, + .iterate_len = { ITERATE_MAX_LEN }, + .iterate_rx_align = ITERATE_ALIGN, + .transfer_count = 1, + .transfers = { + { + .rx_buf = RX(0), + }, + }, + }, + { + .description = "two tx-transfers - alter both", + .fill_option = FILL_COUNT_8, + .iterate_len = { ITERATE_LEN }, + .iterate_tx_align = ITERATE_ALIGN, + .iterate_transfer_mask = BIT(0) | BIT(1), + .transfer_count = 2, + .transfers = { + { + .tx_buf = TX(0), + }, + { + /* this is why we cant use ITERATE_MAX_LEN */ + .tx_buf = TX(SPI_TEST_MAX_SIZE_HALF), + }, + }, + }, + { + .description = "two tx-transfers - alter first", + .fill_option = FILL_COUNT_8, + .iterate_len = { ITERATE_MAX_LEN }, + .iterate_tx_align = ITERATE_ALIGN, + .iterate_transfer_mask = BIT(0), + .transfer_count = 2, + .transfers = { + { + .tx_buf = TX(64), + }, + { + .len = 1, + .tx_buf = TX(0), + }, + }, + }, + { + .description = "two tx-transfers - alter second", + .fill_option = FILL_COUNT_8, + .iterate_len = { ITERATE_MAX_LEN }, + .iterate_tx_align = ITERATE_ALIGN, + .iterate_transfer_mask = BIT(1), + .transfer_count = 2, + .transfers = { + { + .len = 16, + .tx_buf = TX(0), + }, + { + .tx_buf = TX(64), + }, + }, + }, + { + .description = "two transfers tx then rx - alter both", + .fill_option = FILL_COUNT_8, + .iterate_len = { ITERATE_MAX_LEN }, + .iterate_tx_align = ITERATE_ALIGN, + .iterate_transfer_mask = BIT(0) | BIT(1), + .transfer_count = 2, + .transfers = { + { + .tx_buf = TX(0), + }, + { + .rx_buf = RX(0), + }, + }, + }, + { + .description = "two transfers tx then rx - alter tx", + .fill_option = FILL_COUNT_8, + .iterate_len = { ITERATE_MAX_LEN }, + .iterate_tx_align = ITERATE_ALIGN, + .iterate_transfer_mask = BIT(0), + .transfer_count = 2, + .transfers = { + { + .tx_buf = TX(0), + }, + { + .len = 1, + .rx_buf = RX(0), + }, + }, + }, + { + .description = "two transfers tx then rx - alter rx", + .fill_option = FILL_COUNT_8, + .iterate_len = { ITERATE_MAX_LEN }, + .iterate_tx_align = ITERATE_ALIGN, + .iterate_transfer_mask = BIT(1), + .transfer_count = 2, + .transfers = { + { + .len = 1, + .tx_buf = TX(0), + }, + { + .rx_buf = RX(0), + }, + }, + }, + { + .description = "two tx+rx transfers - alter both", + .fill_option = FILL_COUNT_8, + .iterate_len = { ITERATE_LEN }, + .iterate_tx_align = ITERATE_ALIGN, + .iterate_transfer_mask = BIT(0) | BIT(1), + .transfer_count = 2, + .transfers = { + { + .tx_buf = TX(0), + .rx_buf = RX(0), + }, + { + /* making sure we align without overwrite + * the reason we can not use ITERATE_MAX_LEN + */ + .tx_buf = TX(SPI_TEST_MAX_SIZE_HALF), + .rx_buf = RX(SPI_TEST_MAX_SIZE_HALF), + }, + }, + }, + { + .description = "two tx+rx transfers - alter first", + .fill_option = FILL_COUNT_8, + .iterate_len = { ITERATE_MAX_LEN }, + .iterate_tx_align = ITERATE_ALIGN, + .iterate_transfer_mask = BIT(0), + .transfer_count = 2, + .transfers = { + { + /* making sure we align without overwrite */ + .tx_buf = TX(1024), + .rx_buf = RX(1024), + }, + { + .len = 1, + /* making sure we align without overwrite */ + .tx_buf = TX(0), + .rx_buf = RX(0), + }, + }, + }, + { + .description = "two tx+rx transfers - alter second", + .fill_option = FILL_COUNT_8, + .iterate_len = { ITERATE_MAX_LEN }, + .iterate_tx_align = ITERATE_ALIGN, + .iterate_transfer_mask = BIT(1), + .transfer_count = 2, + .transfers = { + { + .len = 1, + .tx_buf = TX(0), + .rx_buf = RX(0), + }, + { + /* making sure we align without overwrite */ + .tx_buf = TX(1024), + .rx_buf = RX(1024), + }, + }, + }, + { + .description = "two tx+rx transfers - delay after transfer", + .fill_option = FILL_COUNT_8, + .iterate_len = { ITERATE_MAX_LEN }, + .iterate_transfer_mask = BIT(0) | BIT(1), + .transfer_count = 2, + .transfers = { + { + .tx_buf = TX(0), + .rx_buf = RX(0), + .delay = { + .value = 1000, + .unit = SPI_DELAY_UNIT_USECS, + }, + }, + { + .tx_buf = TX(0), + .rx_buf = RX(0), + .delay = { + .value = 1000, + .unit = SPI_DELAY_UNIT_USECS, + }, + }, + }, + }, + + { /* end of tests sequence */ } +}; + +static int spi_loopback_test_probe(struct spi_device *spi) +{ + int ret; + + if (loop_req || no_cs) { + spi->mode |= loop_req ? SPI_LOOP : 0; + spi->mode |= no_cs ? SPI_NO_CS : 0; + ret = spi_setup(spi); + if (ret) { + dev_err(&spi->dev, "SPI setup with SPI_LOOP or SPI_NO_CS failed (%d)\n", + ret); + return ret; + } + } + + dev_info(&spi->dev, "Executing spi-loopback-tests\n"); + + ret = spi_test_run_tests(spi, spi_tests); + + dev_info(&spi->dev, "Finished spi-loopback-tests with return: %i\n", + ret); + + return ret; +} + +/* non const match table to permit to change via a module parameter */ +static struct of_device_id spi_loopback_test_of_match[] = { + { .compatible = "linux,spi-loopback-test", }, + { } +}; + +/* allow to override the compatible string via a module_parameter */ +module_param_string(compatible, spi_loopback_test_of_match[0].compatible, + sizeof(spi_loopback_test_of_match[0].compatible), + 0000); + +MODULE_DEVICE_TABLE(of, spi_loopback_test_of_match); + +static struct spi_driver spi_loopback_test_driver = { + .driver = { + .name = "spi-loopback-test", + .owner = THIS_MODULE, + .of_match_table = spi_loopback_test_of_match, + }, + .probe = spi_loopback_test_probe, +}; + +module_spi_driver(spi_loopback_test_driver); + +MODULE_AUTHOR("Martin Sperl <kernel@martin.sperl.org>"); +MODULE_DESCRIPTION("test spi_driver to check core functionality"); +MODULE_LICENSE("GPL"); + +/*-------------------------------------------------------------------------*/ + +/* spi_test implementation */ + +#define RANGE_CHECK(ptr, plen, start, slen) \ + ((ptr >= start) && (ptr + plen <= start + slen)) + +/* we allocate one page more, to allow for offsets */ +#define SPI_TEST_MAX_SIZE_PLUS (SPI_TEST_MAX_SIZE + PAGE_SIZE) + +static void spi_test_print_hex_dump(char *pre, const void *ptr, size_t len) +{ + /* limit the hex_dump */ + if (len < 1024) { + print_hex_dump(KERN_INFO, pre, + DUMP_PREFIX_OFFSET, 16, 1, + ptr, len, 0); + return; + } + /* print head */ + print_hex_dump(KERN_INFO, pre, + DUMP_PREFIX_OFFSET, 16, 1, + ptr, 512, 0); + /* print tail */ + pr_info("%s truncated - continuing at offset %04zx\n", + pre, len - 512); + print_hex_dump(KERN_INFO, pre, + DUMP_PREFIX_OFFSET, 16, 1, + ptr + (len - 512), 512, 0); +} + +static void spi_test_dump_message(struct spi_device *spi, + struct spi_message *msg, + bool dump_data) +{ + struct spi_transfer *xfer; + int i; + u8 b; + + dev_info(&spi->dev, " spi_msg@%pK\n", msg); + if (msg->status) + dev_info(&spi->dev, " status: %i\n", + msg->status); + dev_info(&spi->dev, " frame_length: %i\n", + msg->frame_length); + dev_info(&spi->dev, " actual_length: %i\n", + msg->actual_length); + + list_for_each_entry(xfer, &msg->transfers, transfer_list) { + dev_info(&spi->dev, " spi_transfer@%pK\n", xfer); + dev_info(&spi->dev, " len: %i\n", xfer->len); + dev_info(&spi->dev, " tx_buf: %pK\n", xfer->tx_buf); + if (dump_data && xfer->tx_buf) + spi_test_print_hex_dump(" TX: ", + xfer->tx_buf, + xfer->len); + + dev_info(&spi->dev, " rx_buf: %pK\n", xfer->rx_buf); + if (dump_data && xfer->rx_buf) + spi_test_print_hex_dump(" RX: ", + xfer->rx_buf, + xfer->len); + /* check for unwritten test pattern on rx_buf */ + if (xfer->rx_buf) { + for (i = 0 ; i < xfer->len ; i++) { + b = ((u8 *)xfer->rx_buf)[xfer->len - 1 - i]; + if (b != SPI_TEST_PATTERN_UNWRITTEN) + break; + } + if (i) + dev_info(&spi->dev, + " rx_buf filled with %02x starts at offset: %i\n", + SPI_TEST_PATTERN_UNWRITTEN, + xfer->len - i); + } + } +} + +struct rx_ranges { + struct list_head list; + u8 *start; + u8 *end; +}; + +static int rx_ranges_cmp(void *priv, const struct list_head *a, + const struct list_head *b) +{ + struct rx_ranges *rx_a = list_entry(a, struct rx_ranges, list); + struct rx_ranges *rx_b = list_entry(b, struct rx_ranges, list); + + if (rx_a->start > rx_b->start) + return 1; + if (rx_a->start < rx_b->start) + return -1; + return 0; +} + +static int spi_check_rx_ranges(struct spi_device *spi, + struct spi_message *msg, + void *rx) +{ + struct spi_transfer *xfer; + struct rx_ranges ranges[SPI_TEST_MAX_TRANSFERS], *r; + int i = 0; + LIST_HEAD(ranges_list); + u8 *addr; + int ret = 0; + + /* loop over all transfers to fill in the rx_ranges */ + list_for_each_entry(xfer, &msg->transfers, transfer_list) { + /* if there is no rx, then no check is needed */ + if (!xfer->rx_buf) + continue; + /* fill in the rx_range */ + if (RANGE_CHECK(xfer->rx_buf, xfer->len, + rx, SPI_TEST_MAX_SIZE_PLUS)) { + ranges[i].start = xfer->rx_buf; + ranges[i].end = xfer->rx_buf + xfer->len; + list_add(&ranges[i].list, &ranges_list); + i++; + } + } + + /* if no ranges, then we can return and avoid the checks...*/ + if (!i) + return 0; + + /* sort the list */ + list_sort(NULL, &ranges_list, rx_ranges_cmp); + + /* and iterate over all the rx addresses */ + for (addr = rx; addr < (u8 *)rx + SPI_TEST_MAX_SIZE_PLUS; addr++) { + /* if we are the DO not write pattern, + * then continue with the loop... + */ + if (*addr == SPI_TEST_PATTERN_DO_NOT_WRITE) + continue; + + /* check if we are inside a range */ + list_for_each_entry(r, &ranges_list, list) { + /* if so then set to end... */ + if ((addr >= r->start) && (addr < r->end)) + addr = r->end; + } + /* second test after a (hopefull) translation */ + if (*addr == SPI_TEST_PATTERN_DO_NOT_WRITE) + continue; + + /* if still not found then something has modified too much */ + /* we could list the "closest" transfer here... */ + dev_err(&spi->dev, + "loopback strangeness - rx changed outside of allowed range at: %pK\n", + addr); + /* do not return, only set ret, + * so that we list all addresses + */ + ret = -ERANGE; + } + + return ret; +} + +static int spi_test_check_elapsed_time(struct spi_device *spi, + struct spi_test *test) +{ + int i; + unsigned long long estimated_time = 0; + unsigned long long delay_usecs = 0; + + for (i = 0; i < test->transfer_count; i++) { + struct spi_transfer *xfer = test->transfers + i; + unsigned long long nbits = (unsigned long long)BITS_PER_BYTE * + xfer->len; + + delay_usecs += xfer->delay.value; + if (!xfer->speed_hz) + continue; + estimated_time += div_u64(nbits * NSEC_PER_SEC, xfer->speed_hz); + } + + estimated_time += delay_usecs * NSEC_PER_USEC; + if (test->elapsed_time < estimated_time) { + dev_err(&spi->dev, + "elapsed time %lld ns is shorter than minimum estimated time %lld ns\n", + test->elapsed_time, estimated_time); + + return -EINVAL; + } + + return 0; +} + +static int spi_test_check_loopback_result(struct spi_device *spi, + struct spi_message *msg, + void *tx, void *rx) +{ + struct spi_transfer *xfer; + u8 rxb, txb; + size_t i; + int ret; + + /* checks rx_buffer pattern are valid with loopback or without */ + if (check_ranges) { + ret = spi_check_rx_ranges(spi, msg, rx); + if (ret) + return ret; + } + + /* if we run without loopback, then return now */ + if (!loopback) + return 0; + + /* if applicable to transfer check that rx_buf is equal to tx_buf */ + list_for_each_entry(xfer, &msg->transfers, transfer_list) { + /* if there is no rx, then no check is needed */ + if (!xfer->len || !xfer->rx_buf) + continue; + /* so depending on tx_buf we need to handle things */ + if (xfer->tx_buf) { + for (i = 0; i < xfer->len; i++) { + txb = ((u8 *)xfer->tx_buf)[i]; + rxb = ((u8 *)xfer->rx_buf)[i]; + if (txb != rxb) + goto mismatch_error; + } + } else { + /* first byte received */ + txb = ((u8 *)xfer->rx_buf)[0]; + /* first byte may be 0 or xff */ + if (!((txb == 0) || (txb == 0xff))) { + dev_err(&spi->dev, + "loopback strangeness - we expect 0x00 or 0xff, but not 0x%02x\n", + txb); + return -EINVAL; + } + /* check that all bytes are identical */ + for (i = 1; i < xfer->len; i++) { + rxb = ((u8 *)xfer->rx_buf)[i]; + if (rxb != txb) + goto mismatch_error; + } + } + } + + return 0; + +mismatch_error: + dev_err(&spi->dev, + "loopback strangeness - transfer mismatch on byte %04zx - expected 0x%02x, but got 0x%02x\n", + i, txb, rxb); + + return -EINVAL; +} + +static int spi_test_translate(struct spi_device *spi, + void **ptr, size_t len, + void *tx, void *rx) +{ + size_t off; + + /* return on null */ + if (!*ptr) + return 0; + + /* in the MAX_SIZE_HALF case modify the pointer */ + if (((size_t)*ptr) & SPI_TEST_MAX_SIZE_HALF) + /* move the pointer to the correct range */ + *ptr += (SPI_TEST_MAX_SIZE_PLUS / 2) - + SPI_TEST_MAX_SIZE_HALF; + + /* RX range + * - we check against MAX_SIZE_PLUS to allow for automated alignment + */ + if (RANGE_CHECK(*ptr, len, RX(0), SPI_TEST_MAX_SIZE_PLUS)) { + off = *ptr - RX(0); + *ptr = rx + off; + + return 0; + } + + /* TX range */ + if (RANGE_CHECK(*ptr, len, TX(0), SPI_TEST_MAX_SIZE_PLUS)) { + off = *ptr - TX(0); + *ptr = tx + off; + + return 0; + } + + dev_err(&spi->dev, + "PointerRange [%pK:%pK[ not in range [%pK:%pK[ or [%pK:%pK[\n", + *ptr, *ptr + len, + RX(0), RX(SPI_TEST_MAX_SIZE), + TX(0), TX(SPI_TEST_MAX_SIZE)); + + return -EINVAL; +} + +static int spi_test_fill_pattern(struct spi_device *spi, + struct spi_test *test) +{ + struct spi_transfer *xfers = test->transfers; + u8 *tx_buf; + size_t count = 0; + int i, j; + +#ifdef __BIG_ENDIAN +#define GET_VALUE_BYTE(value, index, bytes) \ + (value >> (8 * (bytes - 1 - count % bytes))) +#else +#define GET_VALUE_BYTE(value, index, bytes) \ + (value >> (8 * (count % bytes))) +#endif + + /* fill all transfers with the pattern requested */ + for (i = 0; i < test->transfer_count; i++) { + /* fill rx_buf with SPI_TEST_PATTERN_UNWRITTEN */ + if (xfers[i].rx_buf) + memset(xfers[i].rx_buf, SPI_TEST_PATTERN_UNWRITTEN, + xfers[i].len); + /* if tx_buf is NULL then skip */ + tx_buf = (u8 *)xfers[i].tx_buf; + if (!tx_buf) + continue; + /* modify all the transfers */ + for (j = 0; j < xfers[i].len; j++, tx_buf++, count++) { + /* fill tx */ + switch (test->fill_option) { + case FILL_MEMSET_8: + *tx_buf = test->fill_pattern; + break; + case FILL_MEMSET_16: + *tx_buf = GET_VALUE_BYTE(test->fill_pattern, + count, 2); + break; + case FILL_MEMSET_24: + *tx_buf = GET_VALUE_BYTE(test->fill_pattern, + count, 3); + break; + case FILL_MEMSET_32: + *tx_buf = GET_VALUE_BYTE(test->fill_pattern, + count, 4); + break; + case FILL_COUNT_8: + *tx_buf = count; + break; + case FILL_COUNT_16: + *tx_buf = GET_VALUE_BYTE(count, count, 2); + break; + case FILL_COUNT_24: + *tx_buf = GET_VALUE_BYTE(count, count, 3); + break; + case FILL_COUNT_32: + *tx_buf = GET_VALUE_BYTE(count, count, 4); + break; + case FILL_TRANSFER_BYTE_8: + *tx_buf = j; + break; + case FILL_TRANSFER_BYTE_16: + *tx_buf = GET_VALUE_BYTE(j, j, 2); + break; + case FILL_TRANSFER_BYTE_24: + *tx_buf = GET_VALUE_BYTE(j, j, 3); + break; + case FILL_TRANSFER_BYTE_32: + *tx_buf = GET_VALUE_BYTE(j, j, 4); + break; + case FILL_TRANSFER_NUM: + *tx_buf = i; + break; + default: + dev_err(&spi->dev, + "unsupported fill_option: %i\n", + test->fill_option); + return -EINVAL; + } + } + } + + return 0; +} + +static int _spi_test_run_iter(struct spi_device *spi, + struct spi_test *test, + void *tx, void *rx) +{ + struct spi_message *msg = &test->msg; + struct spi_transfer *x; + int i, ret; + + /* initialize message - zero-filled via static initialization */ + spi_message_init_no_memset(msg); + + /* fill rx with the DO_NOT_WRITE pattern */ + memset(rx, SPI_TEST_PATTERN_DO_NOT_WRITE, SPI_TEST_MAX_SIZE_PLUS); + + /* add the individual transfers */ + for (i = 0; i < test->transfer_count; i++) { + x = &test->transfers[i]; + + /* patch the values of tx_buf */ + ret = spi_test_translate(spi, (void **)&x->tx_buf, x->len, + (void *)tx, rx); + if (ret) + return ret; + + /* patch the values of rx_buf */ + ret = spi_test_translate(spi, &x->rx_buf, x->len, + (void *)tx, rx); + if (ret) + return ret; + + /* and add it to the list */ + spi_message_add_tail(x, msg); + } + + /* fill in the transfer buffers with pattern */ + ret = spi_test_fill_pattern(spi, test); + if (ret) + return ret; + + /* and execute */ + if (test->execute_msg) + ret = test->execute_msg(spi, test, tx, rx); + else + ret = spi_test_execute_msg(spi, test, tx, rx); + + /* handle result */ + if (ret == test->expected_return) + return 0; + + dev_err(&spi->dev, + "test failed - test returned %i, but we expect %i\n", + ret, test->expected_return); + + if (ret) + return ret; + + /* if it is 0, as we expected something else, + * then return something special + */ + return -EFAULT; +} + +static int spi_test_run_iter(struct spi_device *spi, + const struct spi_test *testtemplate, + void *tx, void *rx, + size_t len, + size_t tx_off, + size_t rx_off + ) +{ + struct spi_test test; + int i, tx_count, rx_count; + + /* copy the test template to test */ + memcpy(&test, testtemplate, sizeof(test)); + + /* if iterate_transfer_mask is not set, + * then set it to first transfer only + */ + if (!(test.iterate_transfer_mask & (BIT(test.transfer_count) - 1))) + test.iterate_transfer_mask = 1; + + /* count number of transfers with tx/rx_buf != NULL */ + rx_count = tx_count = 0; + for (i = 0; i < test.transfer_count; i++) { + if (test.transfers[i].tx_buf) + tx_count++; + if (test.transfers[i].rx_buf) + rx_count++; + } + + /* in some iteration cases warn and exit early, + * as there is nothing to do, that has not been tested already... + */ + if (tx_off && (!tx_count)) { + dev_warn_once(&spi->dev, + "%s: iterate_tx_off configured with tx_buf==NULL - ignoring\n", + test.description); + return 0; + } + if (rx_off && (!rx_count)) { + dev_warn_once(&spi->dev, + "%s: iterate_rx_off configured with rx_buf==NULL - ignoring\n", + test.description); + return 0; + } + + /* write out info */ + if (!(len || tx_off || rx_off)) { + dev_info(&spi->dev, "Running test %s\n", test.description); + } else { + dev_info(&spi->dev, + " with iteration values: len = %zu, tx_off = %zu, rx_off = %zu\n", + len, tx_off, rx_off); + } + + /* update in the values from iteration values */ + for (i = 0; i < test.transfer_count; i++) { + /* only when bit in transfer mask is set */ + if (!(test.iterate_transfer_mask & BIT(i))) + continue; + test.transfers[i].len = len; + if (test.transfers[i].tx_buf) + test.transfers[i].tx_buf += tx_off; + if (test.transfers[i].rx_buf) + test.transfers[i].rx_buf += rx_off; + } + + /* and execute */ + return _spi_test_run_iter(spi, &test, tx, rx); +} + +/** + * spi_test_execute_msg - default implementation to run a test + * + * @spi: @spi_device on which to run the @spi_message + * @test: the test to execute, which already contains @msg + * @tx: the tx buffer allocated for the test sequence + * @rx: the rx buffer allocated for the test sequence + * + * Returns: error code of spi_sync as well as basic error checking + */ +int spi_test_execute_msg(struct spi_device *spi, struct spi_test *test, + void *tx, void *rx) +{ + struct spi_message *msg = &test->msg; + int ret = 0; + int i; + + /* only if we do not simulate */ + if (!simulate_only) { + ktime_t start; + + /* dump the complete message before and after the transfer */ + if (dump_messages == 3) + spi_test_dump_message(spi, msg, true); + + start = ktime_get(); + /* run spi message */ + ret = spi_sync(spi, msg); + test->elapsed_time = ktime_to_ns(ktime_sub(ktime_get(), start)); + if (ret == -ETIMEDOUT) { + dev_info(&spi->dev, + "spi-message timed out - rerunning...\n"); + /* rerun after a few explicit schedules */ + for (i = 0; i < 16; i++) + schedule(); + ret = spi_sync(spi, msg); + } + if (ret) { + dev_err(&spi->dev, + "Failed to execute spi_message: %i\n", + ret); + goto exit; + } + + /* do some extra error checks */ + if (msg->frame_length != msg->actual_length) { + dev_err(&spi->dev, + "actual length differs from expected\n"); + ret = -EIO; + goto exit; + } + + /* run rx-buffer tests */ + ret = spi_test_check_loopback_result(spi, msg, tx, rx); + if (ret) + goto exit; + + ret = spi_test_check_elapsed_time(spi, test); + } + + /* if requested or on error dump message (including data) */ +exit: + if (dump_messages || ret) + spi_test_dump_message(spi, msg, + (dump_messages >= 2) || (ret)); + + return ret; +} +EXPORT_SYMBOL_GPL(spi_test_execute_msg); + +/** + * spi_test_run_test - run an individual spi_test + * including all the relevant iterations on: + * length and buffer alignment + * + * @spi: the spi_device to send the messages to + * @test: the test which we need to execute + * @tx: the tx buffer allocated for the test sequence + * @rx: the rx buffer allocated for the test sequence + * + * Returns: status code of spi_sync or other failures + */ + +int spi_test_run_test(struct spi_device *spi, const struct spi_test *test, + void *tx, void *rx) +{ + int idx_len; + size_t len; + size_t tx_align, rx_align; + int ret; + + /* test for transfer limits */ + if (test->transfer_count >= SPI_TEST_MAX_TRANSFERS) { + dev_err(&spi->dev, + "%s: Exceeded max number of transfers with %i\n", + test->description, test->transfer_count); + return -E2BIG; + } + + /* setting up some values in spi_message + * based on some settings in spi_master + * some of this can also get done in the run() method + */ + + /* iterate over all the iterable values using macros + * (to make it a bit more readable... + */ +#define FOR_EACH_ALIGNMENT(var) \ + for (var = 0; \ + var < (test->iterate_##var ? \ + (spi->master->dma_alignment ? \ + spi->master->dma_alignment : \ + test->iterate_##var) : \ + 1); \ + var++) + + for (idx_len = 0; idx_len < SPI_TEST_MAX_ITERATE && + (len = test->iterate_len[idx_len]) != -1; idx_len++) { + FOR_EACH_ALIGNMENT(tx_align) { + FOR_EACH_ALIGNMENT(rx_align) { + /* and run the iteration */ + ret = spi_test_run_iter(spi, test, + tx, rx, + len, + tx_align, + rx_align); + if (ret) + return ret; + } + } + } + + return 0; +} +EXPORT_SYMBOL_GPL(spi_test_run_test); + +/** + * spi_test_run_tests - run an array of spi_messages tests + * @spi: the spi device on which to run the tests + * @tests: NULL-terminated array of @spi_test + * + * Returns: status errors as per @spi_test_run_test() + */ + +int spi_test_run_tests(struct spi_device *spi, + struct spi_test *tests) +{ + char *rx = NULL, *tx = NULL; + int ret = 0, count = 0; + struct spi_test *test; + + /* allocate rx/tx buffers of 128kB size without devm + * in the hope that is on a page boundary + */ + if (use_vmalloc) + rx = vmalloc(SPI_TEST_MAX_SIZE_PLUS); + else + rx = kzalloc(SPI_TEST_MAX_SIZE_PLUS, GFP_KERNEL); + if (!rx) + return -ENOMEM; + + + if (use_vmalloc) + tx = vmalloc(SPI_TEST_MAX_SIZE_PLUS); + else + tx = kzalloc(SPI_TEST_MAX_SIZE_PLUS, GFP_KERNEL); + if (!tx) { + ret = -ENOMEM; + goto err_tx; + } + + /* now run the individual tests in the table */ + for (test = tests, count = 0; test->description[0]; + test++, count++) { + /* only run test if requested */ + if ((run_only_test > -1) && (count != run_only_test)) + continue; + /* run custom implementation */ + if (test->run_test) + ret = test->run_test(spi, test, tx, rx); + else + ret = spi_test_run_test(spi, test, tx, rx); + if (ret) + goto out; + /* add some delays so that we can easily + * detect the individual tests when using a logic analyzer + * we also add scheduling to avoid potential spi_timeouts... + */ + mdelay(100); + schedule(); + } + +out: + kvfree(tx); +err_tx: + kvfree(rx); + return ret; +} +EXPORT_SYMBOL_GPL(spi_test_run_tests); diff --git a/drivers/spi/spi-lp8841-rtc.c b/drivers/spi/spi-lp8841-rtc.c new file mode 100644 index 000000000..2d436541d --- /dev/null +++ b/drivers/spi/spi-lp8841-rtc.c @@ -0,0 +1,245 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * SPI master driver for ICP DAS LP-8841 RTC + * + * Copyright (C) 2016 Sergei Ianovich + * + * based on + * + * Dallas DS1302 RTC Support + * Copyright (C) 2002 David McCullough + * Copyright (C) 2003 - 2007 Paul Mundt + */ +#include <linux/delay.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/platform_device.h> +#include <linux/of.h> +#include <linux/of_device.h> +#include <linux/spi/spi.h> + +#define DRIVER_NAME "spi_lp8841_rtc" + +#define SPI_LP8841_RTC_CE 0x01 +#define SPI_LP8841_RTC_CLK 0x02 +#define SPI_LP8841_RTC_nWE 0x04 +#define SPI_LP8841_RTC_MOSI 0x08 +#define SPI_LP8841_RTC_MISO 0x01 + +/* + * REVISIT If there is support for SPI_3WIRE and SPI_LSB_FIRST in SPI + * GPIO driver, this SPI driver can be replaced by a simple GPIO driver + * providing 3 GPIO pins. + */ + +struct spi_lp8841_rtc { + void *iomem; + unsigned long state; +}; + +static inline void +setsck(struct spi_lp8841_rtc *data, int is_on) +{ + if (is_on) + data->state |= SPI_LP8841_RTC_CLK; + else + data->state &= ~SPI_LP8841_RTC_CLK; + writeb(data->state, data->iomem); +} + +static inline void +setmosi(struct spi_lp8841_rtc *data, int is_on) +{ + if (is_on) + data->state |= SPI_LP8841_RTC_MOSI; + else + data->state &= ~SPI_LP8841_RTC_MOSI; + writeb(data->state, data->iomem); +} + +static inline int +getmiso(struct spi_lp8841_rtc *data) +{ + return ioread8(data->iomem) & SPI_LP8841_RTC_MISO; +} + +static inline u32 +bitbang_txrx_be_cpha0_lsb(struct spi_lp8841_rtc *data, + unsigned usecs, unsigned cpol, unsigned flags, + u32 word, u8 bits) +{ + /* if (cpol == 0) this is SPI_MODE_0; else this is SPI_MODE_2 */ + + u32 shift = 32 - bits; + /* clock starts at inactive polarity */ + for (; likely(bits); bits--) { + + /* setup LSB (to slave) on leading edge */ + if ((flags & SPI_MASTER_NO_TX) == 0) + setmosi(data, (word & 1)); + + usleep_range(usecs, usecs + 1); /* T(setup) */ + + /* sample LSB (from slave) on trailing edge */ + word >>= 1; + if ((flags & SPI_MASTER_NO_RX) == 0) + word |= (getmiso(data) << 31); + + setsck(data, !cpol); + usleep_range(usecs, usecs + 1); + + setsck(data, cpol); + } + + word >>= shift; + return word; +} + +static int +spi_lp8841_rtc_transfer_one(struct spi_master *master, + struct spi_device *spi, + struct spi_transfer *t) +{ + struct spi_lp8841_rtc *data = spi_master_get_devdata(master); + unsigned count = t->len; + const u8 *tx = t->tx_buf; + u8 *rx = t->rx_buf; + u8 word = 0; + int ret = 0; + + if (tx) { + data->state &= ~SPI_LP8841_RTC_nWE; + writeb(data->state, data->iomem); + while (likely(count > 0)) { + word = *tx++; + bitbang_txrx_be_cpha0_lsb(data, 1, 0, + SPI_MASTER_NO_RX, word, 8); + count--; + } + } else if (rx) { + data->state |= SPI_LP8841_RTC_nWE; + writeb(data->state, data->iomem); + while (likely(count > 0)) { + word = bitbang_txrx_be_cpha0_lsb(data, 1, 0, + SPI_MASTER_NO_TX, word, 8); + *rx++ = word; + count--; + } + } else { + ret = -EINVAL; + } + + spi_finalize_current_transfer(master); + + return ret; +} + +static void +spi_lp8841_rtc_set_cs(struct spi_device *spi, bool enable) +{ + struct spi_lp8841_rtc *data = spi_master_get_devdata(spi->master); + + data->state = 0; + writeb(data->state, data->iomem); + if (enable) { + usleep_range(4, 5); + data->state |= SPI_LP8841_RTC_CE; + writeb(data->state, data->iomem); + usleep_range(4, 5); + } +} + +static int +spi_lp8841_rtc_setup(struct spi_device *spi) +{ + if ((spi->mode & SPI_CS_HIGH) == 0) { + dev_err(&spi->dev, "unsupported active low chip select\n"); + return -EINVAL; + } + + if ((spi->mode & SPI_LSB_FIRST) == 0) { + dev_err(&spi->dev, "unsupported MSB first mode\n"); + return -EINVAL; + } + + if ((spi->mode & SPI_3WIRE) == 0) { + dev_err(&spi->dev, "unsupported wiring. 3 wires required\n"); + return -EINVAL; + } + + return 0; +} + +#ifdef CONFIG_OF +static const struct of_device_id spi_lp8841_rtc_dt_ids[] = { + { .compatible = "icpdas,lp8841-spi-rtc" }, + { } +}; + +MODULE_DEVICE_TABLE(of, spi_lp8841_rtc_dt_ids); +#endif + +static int +spi_lp8841_rtc_probe(struct platform_device *pdev) +{ + int ret; + struct spi_master *master; + struct spi_lp8841_rtc *data; + + master = spi_alloc_master(&pdev->dev, sizeof(*data)); + if (!master) + return -ENOMEM; + platform_set_drvdata(pdev, master); + + master->flags = SPI_MASTER_HALF_DUPLEX; + master->mode_bits = SPI_CS_HIGH | SPI_3WIRE | SPI_LSB_FIRST; + + master->bus_num = pdev->id; + master->num_chipselect = 1; + master->setup = spi_lp8841_rtc_setup; + master->set_cs = spi_lp8841_rtc_set_cs; + master->transfer_one = spi_lp8841_rtc_transfer_one; + master->bits_per_word_mask = SPI_BPW_MASK(8); +#ifdef CONFIG_OF + master->dev.of_node = pdev->dev.of_node; +#endif + + data = spi_master_get_devdata(master); + + data->iomem = devm_platform_ioremap_resource(pdev, 0); + ret = PTR_ERR_OR_ZERO(data->iomem); + if (ret) { + dev_err(&pdev->dev, "failed to get IO address\n"); + goto err_put_master; + } + + /* register with the SPI framework */ + ret = devm_spi_register_master(&pdev->dev, master); + if (ret) { + dev_err(&pdev->dev, "cannot register spi master\n"); + goto err_put_master; + } + + return ret; + + +err_put_master: + spi_master_put(master); + + return ret; +} + +MODULE_ALIAS("platform:" DRIVER_NAME); + +static struct platform_driver spi_lp8841_rtc_driver = { + .driver = { + .name = DRIVER_NAME, + .of_match_table = of_match_ptr(spi_lp8841_rtc_dt_ids), + }, + .probe = spi_lp8841_rtc_probe, +}; +module_platform_driver(spi_lp8841_rtc_driver); + +MODULE_DESCRIPTION("SPI master driver for ICP DAS LP-8841 RTC"); +MODULE_AUTHOR("Sergei Ianovich"); +MODULE_LICENSE("GPL"); diff --git a/drivers/spi/spi-mem.c b/drivers/spi/spi-mem.c new file mode 100644 index 000000000..4682f49dc --- /dev/null +++ b/drivers/spi/spi-mem.c @@ -0,0 +1,805 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * Copyright (C) 2018 Exceet Electronics GmbH + * Copyright (C) 2018 Bootlin + * + * Author: Boris Brezillon <boris.brezillon@bootlin.com> + */ +#include <linux/dmaengine.h> +#include <linux/pm_runtime.h> +#include <linux/spi/spi.h> +#include <linux/spi/spi-mem.h> + +#include "internals.h" + +#define SPI_MEM_MAX_BUSWIDTH 8 + +/** + * spi_controller_dma_map_mem_op_data() - DMA-map the buffer attached to a + * memory operation + * @ctlr: the SPI controller requesting this dma_map() + * @op: the memory operation containing the buffer to map + * @sgt: a pointer to a non-initialized sg_table that will be filled by this + * function + * + * Some controllers might want to do DMA on the data buffer embedded in @op. + * This helper prepares everything for you and provides a ready-to-use + * sg_table. This function is not intended to be called from spi drivers. + * Only SPI controller drivers should use it. + * Note that the caller must ensure the memory region pointed by + * op->data.buf.{in,out} is DMA-able before calling this function. + * + * Return: 0 in case of success, a negative error code otherwise. + */ +int spi_controller_dma_map_mem_op_data(struct spi_controller *ctlr, + const struct spi_mem_op *op, + struct sg_table *sgt) +{ + struct device *dmadev; + + if (!op->data.nbytes) + return -EINVAL; + + if (op->data.dir == SPI_MEM_DATA_OUT && ctlr->dma_tx) + dmadev = ctlr->dma_tx->device->dev; + else if (op->data.dir == SPI_MEM_DATA_IN && ctlr->dma_rx) + dmadev = ctlr->dma_rx->device->dev; + else + dmadev = ctlr->dev.parent; + + if (!dmadev) + return -EINVAL; + + return spi_map_buf(ctlr, dmadev, sgt, op->data.buf.in, op->data.nbytes, + op->data.dir == SPI_MEM_DATA_IN ? + DMA_FROM_DEVICE : DMA_TO_DEVICE); +} +EXPORT_SYMBOL_GPL(spi_controller_dma_map_mem_op_data); + +/** + * spi_controller_dma_unmap_mem_op_data() - DMA-unmap the buffer attached to a + * memory operation + * @ctlr: the SPI controller requesting this dma_unmap() + * @op: the memory operation containing the buffer to unmap + * @sgt: a pointer to an sg_table previously initialized by + * spi_controller_dma_map_mem_op_data() + * + * Some controllers might want to do DMA on the data buffer embedded in @op. + * This helper prepares things so that the CPU can access the + * op->data.buf.{in,out} buffer again. + * + * This function is not intended to be called from SPI drivers. Only SPI + * controller drivers should use it. + * + * This function should be called after the DMA operation has finished and is + * only valid if the previous spi_controller_dma_map_mem_op_data() call + * returned 0. + * + * Return: 0 in case of success, a negative error code otherwise. + */ +void spi_controller_dma_unmap_mem_op_data(struct spi_controller *ctlr, + const struct spi_mem_op *op, + struct sg_table *sgt) +{ + struct device *dmadev; + + if (!op->data.nbytes) + return; + + if (op->data.dir == SPI_MEM_DATA_OUT && ctlr->dma_tx) + dmadev = ctlr->dma_tx->device->dev; + else if (op->data.dir == SPI_MEM_DATA_IN && ctlr->dma_rx) + dmadev = ctlr->dma_rx->device->dev; + else + dmadev = ctlr->dev.parent; + + spi_unmap_buf(ctlr, dmadev, sgt, + op->data.dir == SPI_MEM_DATA_IN ? + DMA_FROM_DEVICE : DMA_TO_DEVICE); +} +EXPORT_SYMBOL_GPL(spi_controller_dma_unmap_mem_op_data); + +static int spi_check_buswidth_req(struct spi_mem *mem, u8 buswidth, bool tx) +{ + u32 mode = mem->spi->mode; + + switch (buswidth) { + case 1: + return 0; + + case 2: + if ((tx && + (mode & (SPI_TX_DUAL | SPI_TX_QUAD | SPI_TX_OCTAL))) || + (!tx && + (mode & (SPI_RX_DUAL | SPI_RX_QUAD | SPI_RX_OCTAL)))) + return 0; + + break; + + case 4: + if ((tx && (mode & (SPI_TX_QUAD | SPI_TX_OCTAL))) || + (!tx && (mode & (SPI_RX_QUAD | SPI_RX_OCTAL)))) + return 0; + + break; + + case 8: + if ((tx && (mode & SPI_TX_OCTAL)) || + (!tx && (mode & SPI_RX_OCTAL))) + return 0; + + break; + + default: + break; + } + + return -ENOTSUPP; +} + +bool spi_mem_default_supports_op(struct spi_mem *mem, + const struct spi_mem_op *op) +{ + if (spi_check_buswidth_req(mem, op->cmd.buswidth, true)) + return false; + + if (op->addr.nbytes && + spi_check_buswidth_req(mem, op->addr.buswidth, true)) + return false; + + if (op->dummy.nbytes && + spi_check_buswidth_req(mem, op->dummy.buswidth, true)) + return false; + + if (op->data.dir != SPI_MEM_NO_DATA && + spi_check_buswidth_req(mem, op->data.buswidth, + op->data.dir == SPI_MEM_DATA_OUT)) + return false; + + if (op->cmd.dtr || op->addr.dtr || op->dummy.dtr || op->data.dtr) + return false; + + if (op->cmd.nbytes != 1) + return false; + + return true; +} +EXPORT_SYMBOL_GPL(spi_mem_default_supports_op); + +static bool spi_mem_buswidth_is_valid(u8 buswidth) +{ + if (hweight8(buswidth) > 1 || buswidth > SPI_MEM_MAX_BUSWIDTH) + return false; + + return true; +} + +static int spi_mem_check_op(const struct spi_mem_op *op) +{ + if (!op->cmd.buswidth || !op->cmd.nbytes) + return -EINVAL; + + if ((op->addr.nbytes && !op->addr.buswidth) || + (op->dummy.nbytes && !op->dummy.buswidth) || + (op->data.nbytes && !op->data.buswidth)) + return -EINVAL; + + if (!spi_mem_buswidth_is_valid(op->cmd.buswidth) || + !spi_mem_buswidth_is_valid(op->addr.buswidth) || + !spi_mem_buswidth_is_valid(op->dummy.buswidth) || + !spi_mem_buswidth_is_valid(op->data.buswidth)) + return -EINVAL; + + return 0; +} + +static bool spi_mem_internal_supports_op(struct spi_mem *mem, + const struct spi_mem_op *op) +{ + struct spi_controller *ctlr = mem->spi->controller; + + if (ctlr->mem_ops && ctlr->mem_ops->supports_op) + return ctlr->mem_ops->supports_op(mem, op); + + return spi_mem_default_supports_op(mem, op); +} + +/** + * spi_mem_supports_op() - Check if a memory device and the controller it is + * connected to support a specific memory operation + * @mem: the SPI memory + * @op: the memory operation to check + * + * Some controllers are only supporting Single or Dual IOs, others might only + * support specific opcodes, or it can even be that the controller and device + * both support Quad IOs but the hardware prevents you from using it because + * only 2 IO lines are connected. + * + * This function checks whether a specific operation is supported. + * + * Return: true if @op is supported, false otherwise. + */ +bool spi_mem_supports_op(struct spi_mem *mem, const struct spi_mem_op *op) +{ + if (spi_mem_check_op(op)) + return false; + + return spi_mem_internal_supports_op(mem, op); +} +EXPORT_SYMBOL_GPL(spi_mem_supports_op); + +static int spi_mem_access_start(struct spi_mem *mem) +{ + struct spi_controller *ctlr = mem->spi->controller; + + /* + * Flush the message queue before executing our SPI memory + * operation to prevent preemption of regular SPI transfers. + */ + spi_flush_queue(ctlr); + + if (ctlr->auto_runtime_pm) { + int ret; + + ret = pm_runtime_get_sync(ctlr->dev.parent); + if (ret < 0) { + pm_runtime_put_noidle(ctlr->dev.parent); + dev_err(&ctlr->dev, "Failed to power device: %d\n", + ret); + return ret; + } + } + + mutex_lock(&ctlr->bus_lock_mutex); + mutex_lock(&ctlr->io_mutex); + + return 0; +} + +static void spi_mem_access_end(struct spi_mem *mem) +{ + struct spi_controller *ctlr = mem->spi->controller; + + mutex_unlock(&ctlr->io_mutex); + mutex_unlock(&ctlr->bus_lock_mutex); + + if (ctlr->auto_runtime_pm) + pm_runtime_put(ctlr->dev.parent); +} + +/** + * spi_mem_exec_op() - Execute a memory operation + * @mem: the SPI memory + * @op: the memory operation to execute + * + * Executes a memory operation. + * + * This function first checks that @op is supported and then tries to execute + * it. + * + * Return: 0 in case of success, a negative error code otherwise. + */ +int spi_mem_exec_op(struct spi_mem *mem, const struct spi_mem_op *op) +{ + unsigned int tmpbufsize, xferpos = 0, totalxferlen = 0; + struct spi_controller *ctlr = mem->spi->controller; + struct spi_transfer xfers[4] = { }; + struct spi_message msg; + u8 *tmpbuf; + int ret; + + ret = spi_mem_check_op(op); + if (ret) + return ret; + + if (!spi_mem_internal_supports_op(mem, op)) + return -ENOTSUPP; + + if (ctlr->mem_ops && !mem->spi->cs_gpiod) { + ret = spi_mem_access_start(mem); + if (ret) + return ret; + + ret = ctlr->mem_ops->exec_op(mem, op); + + spi_mem_access_end(mem); + + /* + * Some controllers only optimize specific paths (typically the + * read path) and expect the core to use the regular SPI + * interface in other cases. + */ + if (!ret || ret != -ENOTSUPP) + return ret; + } + + tmpbufsize = op->cmd.nbytes + op->addr.nbytes + op->dummy.nbytes; + + /* + * Allocate a buffer to transmit the CMD, ADDR cycles with kmalloc() so + * we're guaranteed that this buffer is DMA-able, as required by the + * SPI layer. + */ + tmpbuf = kzalloc(tmpbufsize, GFP_KERNEL | GFP_DMA); + if (!tmpbuf) + return -ENOMEM; + + spi_message_init(&msg); + + tmpbuf[0] = op->cmd.opcode; + xfers[xferpos].tx_buf = tmpbuf; + xfers[xferpos].len = op->cmd.nbytes; + xfers[xferpos].tx_nbits = op->cmd.buswidth; + spi_message_add_tail(&xfers[xferpos], &msg); + xferpos++; + totalxferlen++; + + if (op->addr.nbytes) { + int i; + + for (i = 0; i < op->addr.nbytes; i++) + tmpbuf[i + 1] = op->addr.val >> + (8 * (op->addr.nbytes - i - 1)); + + xfers[xferpos].tx_buf = tmpbuf + 1; + xfers[xferpos].len = op->addr.nbytes; + xfers[xferpos].tx_nbits = op->addr.buswidth; + spi_message_add_tail(&xfers[xferpos], &msg); + xferpos++; + totalxferlen += op->addr.nbytes; + } + + if (op->dummy.nbytes) { + memset(tmpbuf + op->addr.nbytes + 1, 0xff, op->dummy.nbytes); + xfers[xferpos].tx_buf = tmpbuf + op->addr.nbytes + 1; + xfers[xferpos].len = op->dummy.nbytes; + xfers[xferpos].tx_nbits = op->dummy.buswidth; + spi_message_add_tail(&xfers[xferpos], &msg); + xferpos++; + totalxferlen += op->dummy.nbytes; + } + + if (op->data.nbytes) { + if (op->data.dir == SPI_MEM_DATA_IN) { + xfers[xferpos].rx_buf = op->data.buf.in; + xfers[xferpos].rx_nbits = op->data.buswidth; + } else { + xfers[xferpos].tx_buf = op->data.buf.out; + xfers[xferpos].tx_nbits = op->data.buswidth; + } + + xfers[xferpos].len = op->data.nbytes; + spi_message_add_tail(&xfers[xferpos], &msg); + xferpos++; + totalxferlen += op->data.nbytes; + } + + ret = spi_sync(mem->spi, &msg); + + kfree(tmpbuf); + + if (ret) + return ret; + + if (msg.actual_length != totalxferlen) + return -EIO; + + return 0; +} +EXPORT_SYMBOL_GPL(spi_mem_exec_op); + +/** + * spi_mem_get_name() - Return the SPI mem device name to be used by the + * upper layer if necessary + * @mem: the SPI memory + * + * This function allows SPI mem users to retrieve the SPI mem device name. + * It is useful if the upper layer needs to expose a custom name for + * compatibility reasons. + * + * Return: a string containing the name of the memory device to be used + * by the SPI mem user + */ +const char *spi_mem_get_name(struct spi_mem *mem) +{ + return mem->name; +} +EXPORT_SYMBOL_GPL(spi_mem_get_name); + +/** + * spi_mem_adjust_op_size() - Adjust the data size of a SPI mem operation to + * match controller limitations + * @mem: the SPI memory + * @op: the operation to adjust + * + * Some controllers have FIFO limitations and must split a data transfer + * operation into multiple ones, others require a specific alignment for + * optimized accesses. This function allows SPI mem drivers to split a single + * operation into multiple sub-operations when required. + * + * Return: a negative error code if the controller can't properly adjust @op, + * 0 otherwise. Note that @op->data.nbytes will be updated if @op + * can't be handled in a single step. + */ +int spi_mem_adjust_op_size(struct spi_mem *mem, struct spi_mem_op *op) +{ + struct spi_controller *ctlr = mem->spi->controller; + size_t len; + + if (ctlr->mem_ops && ctlr->mem_ops->adjust_op_size) + return ctlr->mem_ops->adjust_op_size(mem, op); + + if (!ctlr->mem_ops || !ctlr->mem_ops->exec_op) { + len = op->cmd.nbytes + op->addr.nbytes + op->dummy.nbytes; + + if (len > spi_max_transfer_size(mem->spi)) + return -EINVAL; + + op->data.nbytes = min3((size_t)op->data.nbytes, + spi_max_transfer_size(mem->spi), + spi_max_message_size(mem->spi) - + len); + if (!op->data.nbytes) + return -EINVAL; + } + + return 0; +} +EXPORT_SYMBOL_GPL(spi_mem_adjust_op_size); + +static ssize_t spi_mem_no_dirmap_read(struct spi_mem_dirmap_desc *desc, + u64 offs, size_t len, void *buf) +{ + struct spi_mem_op op = desc->info.op_tmpl; + int ret; + + op.addr.val = desc->info.offset + offs; + op.data.buf.in = buf; + op.data.nbytes = len; + ret = spi_mem_adjust_op_size(desc->mem, &op); + if (ret) + return ret; + + ret = spi_mem_exec_op(desc->mem, &op); + if (ret) + return ret; + + return op.data.nbytes; +} + +static ssize_t spi_mem_no_dirmap_write(struct spi_mem_dirmap_desc *desc, + u64 offs, size_t len, const void *buf) +{ + struct spi_mem_op op = desc->info.op_tmpl; + int ret; + + op.addr.val = desc->info.offset + offs; + op.data.buf.out = buf; + op.data.nbytes = len; + ret = spi_mem_adjust_op_size(desc->mem, &op); + if (ret) + return ret; + + ret = spi_mem_exec_op(desc->mem, &op); + if (ret) + return ret; + + return op.data.nbytes; +} + +/** + * spi_mem_dirmap_create() - Create a direct mapping descriptor + * @mem: SPI mem device this direct mapping should be created for + * @info: direct mapping information + * + * This function is creating a direct mapping descriptor which can then be used + * to access the memory using spi_mem_dirmap_read() or spi_mem_dirmap_write(). + * If the SPI controller driver does not support direct mapping, this function + * falls back to an implementation using spi_mem_exec_op(), so that the caller + * doesn't have to bother implementing a fallback on his own. + * + * Return: a valid pointer in case of success, and ERR_PTR() otherwise. + */ +struct spi_mem_dirmap_desc * +spi_mem_dirmap_create(struct spi_mem *mem, + const struct spi_mem_dirmap_info *info) +{ + struct spi_controller *ctlr = mem->spi->controller; + struct spi_mem_dirmap_desc *desc; + int ret = -ENOTSUPP; + + /* Make sure the number of address cycles is between 1 and 8 bytes. */ + if (!info->op_tmpl.addr.nbytes || info->op_tmpl.addr.nbytes > 8) + return ERR_PTR(-EINVAL); + + /* data.dir should either be SPI_MEM_DATA_IN or SPI_MEM_DATA_OUT. */ + if (info->op_tmpl.data.dir == SPI_MEM_NO_DATA) + return ERR_PTR(-EINVAL); + + desc = kzalloc(sizeof(*desc), GFP_KERNEL); + if (!desc) + return ERR_PTR(-ENOMEM); + + desc->mem = mem; + desc->info = *info; + if (ctlr->mem_ops && ctlr->mem_ops->dirmap_create) + ret = ctlr->mem_ops->dirmap_create(desc); + + if (ret) { + desc->nodirmap = true; + if (!spi_mem_supports_op(desc->mem, &desc->info.op_tmpl)) + ret = -ENOTSUPP; + else + ret = 0; + } + + if (ret) { + kfree(desc); + return ERR_PTR(ret); + } + + return desc; +} +EXPORT_SYMBOL_GPL(spi_mem_dirmap_create); + +/** + * spi_mem_dirmap_destroy() - Destroy a direct mapping descriptor + * @desc: the direct mapping descriptor to destroy + * + * This function destroys a direct mapping descriptor previously created by + * spi_mem_dirmap_create(). + */ +void spi_mem_dirmap_destroy(struct spi_mem_dirmap_desc *desc) +{ + struct spi_controller *ctlr = desc->mem->spi->controller; + + if (!desc->nodirmap && ctlr->mem_ops && ctlr->mem_ops->dirmap_destroy) + ctlr->mem_ops->dirmap_destroy(desc); + + kfree(desc); +} +EXPORT_SYMBOL_GPL(spi_mem_dirmap_destroy); + +static void devm_spi_mem_dirmap_release(struct device *dev, void *res) +{ + struct spi_mem_dirmap_desc *desc = *(struct spi_mem_dirmap_desc **)res; + + spi_mem_dirmap_destroy(desc); +} + +/** + * devm_spi_mem_dirmap_create() - Create a direct mapping descriptor and attach + * it to a device + * @dev: device the dirmap desc will be attached to + * @mem: SPI mem device this direct mapping should be created for + * @info: direct mapping information + * + * devm_ variant of the spi_mem_dirmap_create() function. See + * spi_mem_dirmap_create() for more details. + * + * Return: a valid pointer in case of success, and ERR_PTR() otherwise. + */ +struct spi_mem_dirmap_desc * +devm_spi_mem_dirmap_create(struct device *dev, struct spi_mem *mem, + const struct spi_mem_dirmap_info *info) +{ + struct spi_mem_dirmap_desc **ptr, *desc; + + ptr = devres_alloc(devm_spi_mem_dirmap_release, sizeof(*ptr), + GFP_KERNEL); + if (!ptr) + return ERR_PTR(-ENOMEM); + + desc = spi_mem_dirmap_create(mem, info); + if (IS_ERR(desc)) { + devres_free(ptr); + } else { + *ptr = desc; + devres_add(dev, ptr); + } + + return desc; +} +EXPORT_SYMBOL_GPL(devm_spi_mem_dirmap_create); + +static int devm_spi_mem_dirmap_match(struct device *dev, void *res, void *data) +{ + struct spi_mem_dirmap_desc **ptr = res; + + if (WARN_ON(!ptr || !*ptr)) + return 0; + + return *ptr == data; +} + +/** + * devm_spi_mem_dirmap_destroy() - Destroy a direct mapping descriptor attached + * to a device + * @dev: device the dirmap desc is attached to + * @desc: the direct mapping descriptor to destroy + * + * devm_ variant of the spi_mem_dirmap_destroy() function. See + * spi_mem_dirmap_destroy() for more details. + */ +void devm_spi_mem_dirmap_destroy(struct device *dev, + struct spi_mem_dirmap_desc *desc) +{ + devres_release(dev, devm_spi_mem_dirmap_release, + devm_spi_mem_dirmap_match, desc); +} +EXPORT_SYMBOL_GPL(devm_spi_mem_dirmap_destroy); + +/** + * spi_mem_dirmap_read() - Read data through a direct mapping + * @desc: direct mapping descriptor + * @offs: offset to start reading from. Note that this is not an absolute + * offset, but the offset within the direct mapping which already has + * its own offset + * @len: length in bytes + * @buf: destination buffer. This buffer must be DMA-able + * + * This function reads data from a memory device using a direct mapping + * previously instantiated with spi_mem_dirmap_create(). + * + * Return: the amount of data read from the memory device or a negative error + * code. Note that the returned size might be smaller than @len, and the caller + * is responsible for calling spi_mem_dirmap_read() again when that happens. + */ +ssize_t spi_mem_dirmap_read(struct spi_mem_dirmap_desc *desc, + u64 offs, size_t len, void *buf) +{ + struct spi_controller *ctlr = desc->mem->spi->controller; + ssize_t ret; + + if (desc->info.op_tmpl.data.dir != SPI_MEM_DATA_IN) + return -EINVAL; + + if (!len) + return 0; + + if (desc->nodirmap) { + ret = spi_mem_no_dirmap_read(desc, offs, len, buf); + } else if (ctlr->mem_ops && ctlr->mem_ops->dirmap_read) { + ret = spi_mem_access_start(desc->mem); + if (ret) + return ret; + + ret = ctlr->mem_ops->dirmap_read(desc, offs, len, buf); + + spi_mem_access_end(desc->mem); + } else { + ret = -ENOTSUPP; + } + + return ret; +} +EXPORT_SYMBOL_GPL(spi_mem_dirmap_read); + +/** + * spi_mem_dirmap_write() - Write data through a direct mapping + * @desc: direct mapping descriptor + * @offs: offset to start writing from. Note that this is not an absolute + * offset, but the offset within the direct mapping which already has + * its own offset + * @len: length in bytes + * @buf: source buffer. This buffer must be DMA-able + * + * This function writes data to a memory device using a direct mapping + * previously instantiated with spi_mem_dirmap_create(). + * + * Return: the amount of data written to the memory device or a negative error + * code. Note that the returned size might be smaller than @len, and the caller + * is responsible for calling spi_mem_dirmap_write() again when that happens. + */ +ssize_t spi_mem_dirmap_write(struct spi_mem_dirmap_desc *desc, + u64 offs, size_t len, const void *buf) +{ + struct spi_controller *ctlr = desc->mem->spi->controller; + ssize_t ret; + + if (desc->info.op_tmpl.data.dir != SPI_MEM_DATA_OUT) + return -EINVAL; + + if (!len) + return 0; + + if (desc->nodirmap) { + ret = spi_mem_no_dirmap_write(desc, offs, len, buf); + } else if (ctlr->mem_ops && ctlr->mem_ops->dirmap_write) { + ret = spi_mem_access_start(desc->mem); + if (ret) + return ret; + + ret = ctlr->mem_ops->dirmap_write(desc, offs, len, buf); + + spi_mem_access_end(desc->mem); + } else { + ret = -ENOTSUPP; + } + + return ret; +} +EXPORT_SYMBOL_GPL(spi_mem_dirmap_write); + +static inline struct spi_mem_driver *to_spi_mem_drv(struct device_driver *drv) +{ + return container_of(drv, struct spi_mem_driver, spidrv.driver); +} + +static int spi_mem_probe(struct spi_device *spi) +{ + struct spi_mem_driver *memdrv = to_spi_mem_drv(spi->dev.driver); + struct spi_controller *ctlr = spi->controller; + struct spi_mem *mem; + + mem = devm_kzalloc(&spi->dev, sizeof(*mem), GFP_KERNEL); + if (!mem) + return -ENOMEM; + + mem->spi = spi; + + if (ctlr->mem_ops && ctlr->mem_ops->get_name) + mem->name = ctlr->mem_ops->get_name(mem); + else + mem->name = dev_name(&spi->dev); + + if (IS_ERR_OR_NULL(mem->name)) + return PTR_ERR(mem->name); + + spi_set_drvdata(spi, mem); + + return memdrv->probe(mem); +} + +static int spi_mem_remove(struct spi_device *spi) +{ + struct spi_mem_driver *memdrv = to_spi_mem_drv(spi->dev.driver); + struct spi_mem *mem = spi_get_drvdata(spi); + + if (memdrv->remove) + return memdrv->remove(mem); + + return 0; +} + +static void spi_mem_shutdown(struct spi_device *spi) +{ + struct spi_mem_driver *memdrv = to_spi_mem_drv(spi->dev.driver); + struct spi_mem *mem = spi_get_drvdata(spi); + + if (memdrv->shutdown) + memdrv->shutdown(mem); +} + +/** + * spi_mem_driver_register_with_owner() - Register a SPI memory driver + * @memdrv: the SPI memory driver to register + * @owner: the owner of this driver + * + * Registers a SPI memory driver. + * + * Return: 0 in case of success, a negative error core otherwise. + */ + +int spi_mem_driver_register_with_owner(struct spi_mem_driver *memdrv, + struct module *owner) +{ + memdrv->spidrv.probe = spi_mem_probe; + memdrv->spidrv.remove = spi_mem_remove; + memdrv->spidrv.shutdown = spi_mem_shutdown; + + return __spi_register_driver(owner, &memdrv->spidrv); +} +EXPORT_SYMBOL_GPL(spi_mem_driver_register_with_owner); + +/** + * spi_mem_driver_unregister_with_owner() - Unregister a SPI memory driver + * @memdrv: the SPI memory driver to unregister + * + * Unregisters a SPI memory driver. + */ +void spi_mem_driver_unregister(struct spi_mem_driver *memdrv) +{ + spi_unregister_driver(&memdrv->spidrv); +} +EXPORT_SYMBOL_GPL(spi_mem_driver_unregister); diff --git a/drivers/spi/spi-meson-spicc.c b/drivers/spi/spi-meson-spicc.c new file mode 100644 index 000000000..6974a1c94 --- /dev/null +++ b/drivers/spi/spi-meson-spicc.c @@ -0,0 +1,924 @@ +/* + * Driver for Amlogic Meson SPI communication controller (SPICC) + * + * Copyright (C) BayLibre, SAS + * Author: Neil Armstrong <narmstrong@baylibre.com> + * + * SPDX-License-Identifier: GPL-2.0+ + */ + +#include <linux/bitfield.h> +#include <linux/clk.h> +#include <linux/clk-provider.h> +#include <linux/device.h> +#include <linux/io.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/of.h> +#include <linux/of_device.h> +#include <linux/platform_device.h> +#include <linux/spi/spi.h> +#include <linux/types.h> +#include <linux/interrupt.h> +#include <linux/reset.h> + +/* + * The Meson SPICC controller could support DMA based transfers, but is not + * implemented by the vendor code, and while having the registers documentation + * it has never worked on the GXL Hardware. + * The PIO mode is the only mode implemented, and due to badly designed HW : + * - all transfers are cutted in 16 words burst because the FIFO hangs on + * TX underflow, and there is no TX "Half-Empty" interrupt, so we go by + * FIFO max size chunk only + * - CS management is dumb, and goes UP between every burst, so is really a + * "Data Valid" signal than a Chip Select, GPIO link should be used instead + * to have a CS go down over the full transfer + */ + +#define SPICC_MAX_BURST 128 + +/* Register Map */ +#define SPICC_RXDATA 0x00 + +#define SPICC_TXDATA 0x04 + +#define SPICC_CONREG 0x08 +#define SPICC_ENABLE BIT(0) +#define SPICC_MODE_MASTER BIT(1) +#define SPICC_XCH BIT(2) +#define SPICC_SMC BIT(3) +#define SPICC_POL BIT(4) +#define SPICC_PHA BIT(5) +#define SPICC_SSCTL BIT(6) +#define SPICC_SSPOL BIT(7) +#define SPICC_DRCTL_MASK GENMASK(9, 8) +#define SPICC_DRCTL_IGNORE 0 +#define SPICC_DRCTL_FALLING 1 +#define SPICC_DRCTL_LOWLEVEL 2 +#define SPICC_CS_MASK GENMASK(13, 12) +#define SPICC_DATARATE_MASK GENMASK(18, 16) +#define SPICC_DATARATE_DIV4 0 +#define SPICC_DATARATE_DIV8 1 +#define SPICC_DATARATE_DIV16 2 +#define SPICC_DATARATE_DIV32 3 +#define SPICC_BITLENGTH_MASK GENMASK(24, 19) +#define SPICC_BURSTLENGTH_MASK GENMASK(31, 25) + +#define SPICC_INTREG 0x0c +#define SPICC_TE_EN BIT(0) /* TX FIFO Empty Interrupt */ +#define SPICC_TH_EN BIT(1) /* TX FIFO Half-Full Interrupt */ +#define SPICC_TF_EN BIT(2) /* TX FIFO Full Interrupt */ +#define SPICC_RR_EN BIT(3) /* RX FIFO Ready Interrupt */ +#define SPICC_RH_EN BIT(4) /* RX FIFO Half-Full Interrupt */ +#define SPICC_RF_EN BIT(5) /* RX FIFO Full Interrupt */ +#define SPICC_RO_EN BIT(6) /* RX FIFO Overflow Interrupt */ +#define SPICC_TC_EN BIT(7) /* Transfert Complete Interrupt */ + +#define SPICC_DMAREG 0x10 +#define SPICC_DMA_ENABLE BIT(0) +#define SPICC_TXFIFO_THRESHOLD_MASK GENMASK(5, 1) +#define SPICC_RXFIFO_THRESHOLD_MASK GENMASK(10, 6) +#define SPICC_READ_BURST_MASK GENMASK(14, 11) +#define SPICC_WRITE_BURST_MASK GENMASK(18, 15) +#define SPICC_DMA_URGENT BIT(19) +#define SPICC_DMA_THREADID_MASK GENMASK(25, 20) +#define SPICC_DMA_BURSTNUM_MASK GENMASK(31, 26) + +#define SPICC_STATREG 0x14 +#define SPICC_TE BIT(0) /* TX FIFO Empty Interrupt */ +#define SPICC_TH BIT(1) /* TX FIFO Half-Full Interrupt */ +#define SPICC_TF BIT(2) /* TX FIFO Full Interrupt */ +#define SPICC_RR BIT(3) /* RX FIFO Ready Interrupt */ +#define SPICC_RH BIT(4) /* RX FIFO Half-Full Interrupt */ +#define SPICC_RF BIT(5) /* RX FIFO Full Interrupt */ +#define SPICC_RO BIT(6) /* RX FIFO Overflow Interrupt */ +#define SPICC_TC BIT(7) /* Transfert Complete Interrupt */ + +#define SPICC_PERIODREG 0x18 +#define SPICC_PERIOD GENMASK(14, 0) /* Wait cycles */ + +#define SPICC_TESTREG 0x1c +#define SPICC_TXCNT_MASK GENMASK(4, 0) /* TX FIFO Counter */ +#define SPICC_RXCNT_MASK GENMASK(9, 5) /* RX FIFO Counter */ +#define SPICC_SMSTATUS_MASK GENMASK(12, 10) /* State Machine Status */ +#define SPICC_LBC_RO BIT(13) /* Loop Back Control Read-Only */ +#define SPICC_LBC_W1 BIT(14) /* Loop Back Control Write-Only */ +#define SPICC_SWAP_RO BIT(14) /* RX FIFO Data Swap Read-Only */ +#define SPICC_SWAP_W1 BIT(15) /* RX FIFO Data Swap Write-Only */ +#define SPICC_DLYCTL_RO_MASK GENMASK(20, 15) /* Delay Control Read-Only */ +#define SPICC_MO_DELAY_MASK GENMASK(17, 16) /* Master Output Delay */ +#define SPICC_MO_NO_DELAY 0 +#define SPICC_MO_DELAY_1_CYCLE 1 +#define SPICC_MO_DELAY_2_CYCLE 2 +#define SPICC_MO_DELAY_3_CYCLE 3 +#define SPICC_MI_DELAY_MASK GENMASK(19, 18) /* Master Input Delay */ +#define SPICC_MI_NO_DELAY 0 +#define SPICC_MI_DELAY_1_CYCLE 1 +#define SPICC_MI_DELAY_2_CYCLE 2 +#define SPICC_MI_DELAY_3_CYCLE 3 +#define SPICC_MI_CAP_DELAY_MASK GENMASK(21, 20) /* Master Capture Delay */ +#define SPICC_CAP_AHEAD_2_CYCLE 0 +#define SPICC_CAP_AHEAD_1_CYCLE 1 +#define SPICC_CAP_NO_DELAY 2 +#define SPICC_CAP_DELAY_1_CYCLE 3 +#define SPICC_FIFORST_RO_MASK GENMASK(22, 21) /* FIFO Softreset Read-Only */ +#define SPICC_FIFORST_W1_MASK GENMASK(23, 22) /* FIFO Softreset Write-Only */ + +#define SPICC_DRADDR 0x20 /* Read Address of DMA */ + +#define SPICC_DWADDR 0x24 /* Write Address of DMA */ + +#define SPICC_ENH_CTL0 0x38 /* Enhanced Feature */ +#define SPICC_ENH_CLK_CS_DELAY_MASK GENMASK(15, 0) +#define SPICC_ENH_DATARATE_MASK GENMASK(23, 16) +#define SPICC_ENH_DATARATE_EN BIT(24) +#define SPICC_ENH_MOSI_OEN BIT(25) +#define SPICC_ENH_CLK_OEN BIT(26) +#define SPICC_ENH_CS_OEN BIT(27) +#define SPICC_ENH_CLK_CS_DELAY_EN BIT(28) +#define SPICC_ENH_MAIN_CLK_AO BIT(29) + +#define writel_bits_relaxed(mask, val, addr) \ + writel_relaxed((readl_relaxed(addr) & ~(mask)) | (val), addr) + +struct meson_spicc_data { + unsigned int max_speed_hz; + unsigned int min_speed_hz; + unsigned int fifo_size; + bool has_oen; + bool has_enhance_clk_div; + bool has_pclk; +}; + +struct meson_spicc_device { + struct spi_master *master; + struct platform_device *pdev; + void __iomem *base; + struct clk *core; + struct clk *pclk; + struct clk_divider pow2_div; + struct clk *clk; + struct spi_message *message; + struct spi_transfer *xfer; + const struct meson_spicc_data *data; + u8 *tx_buf; + u8 *rx_buf; + unsigned int bytes_per_word; + unsigned long tx_remain; + unsigned long rx_remain; + unsigned long xfer_remain; +}; + +#define pow2_clk_to_spicc(_div) container_of(_div, struct meson_spicc_device, pow2_div) + +static void meson_spicc_oen_enable(struct meson_spicc_device *spicc) +{ + u32 conf; + + if (!spicc->data->has_oen) + return; + + conf = readl_relaxed(spicc->base + SPICC_ENH_CTL0) | + SPICC_ENH_MOSI_OEN | SPICC_ENH_CLK_OEN | SPICC_ENH_CS_OEN; + + writel_relaxed(conf, spicc->base + SPICC_ENH_CTL0); +} + +static inline bool meson_spicc_txfull(struct meson_spicc_device *spicc) +{ + return !!FIELD_GET(SPICC_TF, + readl_relaxed(spicc->base + SPICC_STATREG)); +} + +static inline bool meson_spicc_rxready(struct meson_spicc_device *spicc) +{ + return FIELD_GET(SPICC_RH | SPICC_RR | SPICC_RF, + readl_relaxed(spicc->base + SPICC_STATREG)); +} + +static inline u32 meson_spicc_pull_data(struct meson_spicc_device *spicc) +{ + unsigned int bytes = spicc->bytes_per_word; + unsigned int byte_shift = 0; + u32 data = 0; + u8 byte; + + while (bytes--) { + byte = *spicc->tx_buf++; + data |= (byte & 0xff) << byte_shift; + byte_shift += 8; + } + + spicc->tx_remain--; + return data; +} + +static inline void meson_spicc_push_data(struct meson_spicc_device *spicc, + u32 data) +{ + unsigned int bytes = spicc->bytes_per_word; + unsigned int byte_shift = 0; + u8 byte; + + while (bytes--) { + byte = (data >> byte_shift) & 0xff; + *spicc->rx_buf++ = byte; + byte_shift += 8; + } + + spicc->rx_remain--; +} + +static inline void meson_spicc_rx(struct meson_spicc_device *spicc) +{ + /* Empty RX FIFO */ + while (spicc->rx_remain && + meson_spicc_rxready(spicc)) + meson_spicc_push_data(spicc, + readl_relaxed(spicc->base + SPICC_RXDATA)); +} + +static inline void meson_spicc_tx(struct meson_spicc_device *spicc) +{ + /* Fill Up TX FIFO */ + while (spicc->tx_remain && + !meson_spicc_txfull(spicc)) + writel_relaxed(meson_spicc_pull_data(spicc), + spicc->base + SPICC_TXDATA); +} + +static inline void meson_spicc_setup_burst(struct meson_spicc_device *spicc) +{ + + unsigned int burst_len = min_t(unsigned int, + spicc->xfer_remain / + spicc->bytes_per_word, + spicc->data->fifo_size); + /* Setup Xfer variables */ + spicc->tx_remain = burst_len; + spicc->rx_remain = burst_len; + spicc->xfer_remain -= burst_len * spicc->bytes_per_word; + + /* Setup burst length */ + writel_bits_relaxed(SPICC_BURSTLENGTH_MASK, + FIELD_PREP(SPICC_BURSTLENGTH_MASK, + burst_len - 1), + spicc->base + SPICC_CONREG); + + /* Fill TX FIFO */ + meson_spicc_tx(spicc); +} + +static irqreturn_t meson_spicc_irq(int irq, void *data) +{ + struct meson_spicc_device *spicc = (void *) data; + + writel_bits_relaxed(SPICC_TC, SPICC_TC, spicc->base + SPICC_STATREG); + + /* Empty RX FIFO */ + meson_spicc_rx(spicc); + + if (!spicc->xfer_remain) { + /* Disable all IRQs */ + writel(0, spicc->base + SPICC_INTREG); + + spi_finalize_current_transfer(spicc->master); + + return IRQ_HANDLED; + } + + /* Setup burst */ + meson_spicc_setup_burst(spicc); + + /* Start burst */ + writel_bits_relaxed(SPICC_XCH, SPICC_XCH, spicc->base + SPICC_CONREG); + + return IRQ_HANDLED; +} + +static void meson_spicc_auto_io_delay(struct meson_spicc_device *spicc) +{ + u32 div, hz; + u32 mi_delay, cap_delay; + u32 conf; + + if (spicc->data->has_enhance_clk_div) { + div = FIELD_GET(SPICC_ENH_DATARATE_MASK, + readl_relaxed(spicc->base + SPICC_ENH_CTL0)); + div++; + div <<= 1; + } else { + div = FIELD_GET(SPICC_DATARATE_MASK, + readl_relaxed(spicc->base + SPICC_CONREG)); + div += 2; + div = 1 << div; + } + + mi_delay = SPICC_MI_NO_DELAY; + cap_delay = SPICC_CAP_AHEAD_2_CYCLE; + hz = clk_get_rate(spicc->clk); + + if (hz >= 100000000) + cap_delay = SPICC_CAP_DELAY_1_CYCLE; + else if (hz >= 80000000) + cap_delay = SPICC_CAP_NO_DELAY; + else if (hz >= 40000000) + cap_delay = SPICC_CAP_AHEAD_1_CYCLE; + else if (div >= 16) + mi_delay = SPICC_MI_DELAY_3_CYCLE; + else if (div >= 8) + mi_delay = SPICC_MI_DELAY_2_CYCLE; + else if (div >= 6) + mi_delay = SPICC_MI_DELAY_1_CYCLE; + + conf = readl_relaxed(spicc->base + SPICC_TESTREG); + conf &= ~(SPICC_MO_DELAY_MASK | SPICC_MI_DELAY_MASK + | SPICC_MI_CAP_DELAY_MASK); + conf |= FIELD_PREP(SPICC_MI_DELAY_MASK, mi_delay); + conf |= FIELD_PREP(SPICC_MI_CAP_DELAY_MASK, cap_delay); + writel_relaxed(conf, spicc->base + SPICC_TESTREG); +} + +static void meson_spicc_setup_xfer(struct meson_spicc_device *spicc, + struct spi_transfer *xfer) +{ + u32 conf, conf_orig; + + /* Read original configuration */ + conf = conf_orig = readl_relaxed(spicc->base + SPICC_CONREG); + + /* Setup word width */ + conf &= ~SPICC_BITLENGTH_MASK; + conf |= FIELD_PREP(SPICC_BITLENGTH_MASK, + (spicc->bytes_per_word << 3) - 1); + + /* Ignore if unchanged */ + if (conf != conf_orig) + writel_relaxed(conf, spicc->base + SPICC_CONREG); + + clk_set_rate(spicc->clk, xfer->speed_hz); + + meson_spicc_auto_io_delay(spicc); + + writel_relaxed(0, spicc->base + SPICC_DMAREG); +} + +static void meson_spicc_reset_fifo(struct meson_spicc_device *spicc) +{ + if (spicc->data->has_oen) + writel_bits_relaxed(SPICC_ENH_MAIN_CLK_AO, + SPICC_ENH_MAIN_CLK_AO, + spicc->base + SPICC_ENH_CTL0); + + writel_bits_relaxed(SPICC_FIFORST_W1_MASK, SPICC_FIFORST_W1_MASK, + spicc->base + SPICC_TESTREG); + + while (meson_spicc_rxready(spicc)) + readl_relaxed(spicc->base + SPICC_RXDATA); + + if (spicc->data->has_oen) + writel_bits_relaxed(SPICC_ENH_MAIN_CLK_AO, 0, + spicc->base + SPICC_ENH_CTL0); +} + +static int meson_spicc_transfer_one(struct spi_master *master, + struct spi_device *spi, + struct spi_transfer *xfer) +{ + struct meson_spicc_device *spicc = spi_master_get_devdata(master); + + /* Store current transfer */ + spicc->xfer = xfer; + + /* Setup transfer parameters */ + spicc->tx_buf = (u8 *)xfer->tx_buf; + spicc->rx_buf = (u8 *)xfer->rx_buf; + spicc->xfer_remain = xfer->len; + + /* Pre-calculate word size */ + spicc->bytes_per_word = + DIV_ROUND_UP(spicc->xfer->bits_per_word, 8); + + if (xfer->len % spicc->bytes_per_word) + return -EINVAL; + + /* Setup transfer parameters */ + meson_spicc_setup_xfer(spicc, xfer); + + meson_spicc_reset_fifo(spicc); + + /* Setup burst */ + meson_spicc_setup_burst(spicc); + + /* Start burst */ + writel_bits_relaxed(SPICC_XCH, SPICC_XCH, spicc->base + SPICC_CONREG); + + /* Enable interrupts */ + writel_relaxed(SPICC_TC_EN, spicc->base + SPICC_INTREG); + + return 1; +} + +static int meson_spicc_prepare_message(struct spi_master *master, + struct spi_message *message) +{ + struct meson_spicc_device *spicc = spi_master_get_devdata(master); + struct spi_device *spi = message->spi; + u32 conf = readl_relaxed(spicc->base + SPICC_CONREG) & SPICC_DATARATE_MASK; + + /* Store current message */ + spicc->message = message; + + /* Enable Master */ + conf |= SPICC_ENABLE; + conf |= SPICC_MODE_MASTER; + + /* SMC = 0 */ + + /* Setup transfer mode */ + if (spi->mode & SPI_CPOL) + conf |= SPICC_POL; + else + conf &= ~SPICC_POL; + + if (spi->mode & SPI_CPHA) + conf |= SPICC_PHA; + else + conf &= ~SPICC_PHA; + + /* SSCTL = 0 */ + + if (spi->mode & SPI_CS_HIGH) + conf |= SPICC_SSPOL; + else + conf &= ~SPICC_SSPOL; + + if (spi->mode & SPI_READY) + conf |= FIELD_PREP(SPICC_DRCTL_MASK, SPICC_DRCTL_LOWLEVEL); + else + conf |= FIELD_PREP(SPICC_DRCTL_MASK, SPICC_DRCTL_IGNORE); + + /* Select CS */ + conf |= FIELD_PREP(SPICC_CS_MASK, spi->chip_select); + + /* Default 8bit word */ + conf |= FIELD_PREP(SPICC_BITLENGTH_MASK, 8 - 1); + + writel_relaxed(conf, spicc->base + SPICC_CONREG); + + /* Setup no wait cycles by default */ + writel_relaxed(0, spicc->base + SPICC_PERIODREG); + + writel_bits_relaxed(SPICC_LBC_W1, 0, spicc->base + SPICC_TESTREG); + + return 0; +} + +static int meson_spicc_unprepare_transfer(struct spi_master *master) +{ + struct meson_spicc_device *spicc = spi_master_get_devdata(master); + u32 conf = readl_relaxed(spicc->base + SPICC_CONREG) & SPICC_DATARATE_MASK; + + /* Disable all IRQs */ + writel(0, spicc->base + SPICC_INTREG); + + device_reset_optional(&spicc->pdev->dev); + + /* Set default configuration, keeping datarate field */ + writel_relaxed(conf, spicc->base + SPICC_CONREG); + + return 0; +} + +static int meson_spicc_setup(struct spi_device *spi) +{ + if (!spi->controller_state) + spi->controller_state = spi_master_get_devdata(spi->master); + + return 0; +} + +static void meson_spicc_cleanup(struct spi_device *spi) +{ + spi->controller_state = NULL; +} + +/* + * The Clock Mux + * x-----------------x x------------x x------\ + * |---| pow2 fixed div |---| pow2 div |----| | + * | x-----------------x x------------x | | + * src ---| | mux |-- out + * | x-----------------x x------------x | | + * |---| enh fixed div |---| enh div |0---| | + * x-----------------x x------------x x------/ + * + * Clk path for GX series: + * src -> pow2 fixed div -> pow2 div -> out + * + * Clk path for AXG series: + * src -> pow2 fixed div -> pow2 div -> mux -> out + * src -> enh fixed div -> enh div -> mux -> out + * + * Clk path for G12A series: + * pclk -> pow2 fixed div -> pow2 div -> mux -> out + * pclk -> enh fixed div -> enh div -> mux -> out + * + * The pow2 divider is tied to the controller HW state, and the + * divider is only valid when the controller is initialized. + * + * A set of clock ops is added to make sure we don't read/set this + * clock rate while the controller is in an unknown state. + */ + +static unsigned long meson_spicc_pow2_recalc_rate(struct clk_hw *hw, + unsigned long parent_rate) +{ + struct clk_divider *divider = to_clk_divider(hw); + struct meson_spicc_device *spicc = pow2_clk_to_spicc(divider); + + if (!spicc->master->cur_msg) + return 0; + + return clk_divider_ops.recalc_rate(hw, parent_rate); +} + +static int meson_spicc_pow2_determine_rate(struct clk_hw *hw, + struct clk_rate_request *req) +{ + struct clk_divider *divider = to_clk_divider(hw); + struct meson_spicc_device *spicc = pow2_clk_to_spicc(divider); + + if (!spicc->master->cur_msg) + return -EINVAL; + + return clk_divider_ops.determine_rate(hw, req); +} + +static int meson_spicc_pow2_set_rate(struct clk_hw *hw, unsigned long rate, + unsigned long parent_rate) +{ + struct clk_divider *divider = to_clk_divider(hw); + struct meson_spicc_device *spicc = pow2_clk_to_spicc(divider); + + if (!spicc->master->cur_msg) + return -EINVAL; + + return clk_divider_ops.set_rate(hw, rate, parent_rate); +} + +const struct clk_ops meson_spicc_pow2_clk_ops = { + .recalc_rate = meson_spicc_pow2_recalc_rate, + .determine_rate = meson_spicc_pow2_determine_rate, + .set_rate = meson_spicc_pow2_set_rate, +}; + +static int meson_spicc_pow2_clk_init(struct meson_spicc_device *spicc) +{ + struct device *dev = &spicc->pdev->dev; + struct clk_fixed_factor *pow2_fixed_div; + struct clk_init_data init; + struct clk *clk; + struct clk_parent_data parent_data[2]; + char name[64]; + + memset(&init, 0, sizeof(init)); + memset(&parent_data, 0, sizeof(parent_data)); + + init.parent_data = parent_data; + + /* algorithm for pow2 div: rate = freq / 4 / (2 ^ N) */ + + pow2_fixed_div = devm_kzalloc(dev, sizeof(*pow2_fixed_div), GFP_KERNEL); + if (!pow2_fixed_div) + return -ENOMEM; + + snprintf(name, sizeof(name), "%s#pow2_fixed_div", dev_name(dev)); + init.name = name; + init.ops = &clk_fixed_factor_ops; + init.flags = 0; + if (spicc->data->has_pclk) + parent_data[0].hw = __clk_get_hw(spicc->pclk); + else + parent_data[0].hw = __clk_get_hw(spicc->core); + init.num_parents = 1; + + pow2_fixed_div->mult = 1, + pow2_fixed_div->div = 4, + pow2_fixed_div->hw.init = &init; + + clk = devm_clk_register(dev, &pow2_fixed_div->hw); + if (WARN_ON(IS_ERR(clk))) + return PTR_ERR(clk); + + snprintf(name, sizeof(name), "%s#pow2_div", dev_name(dev)); + init.name = name; + init.ops = &meson_spicc_pow2_clk_ops; + /* + * Set NOCACHE here to make sure we read the actual HW value + * since we reset the HW after each transfer. + */ + init.flags = CLK_SET_RATE_PARENT | CLK_GET_RATE_NOCACHE; + parent_data[0].hw = &pow2_fixed_div->hw; + init.num_parents = 1; + + spicc->pow2_div.shift = 16, + spicc->pow2_div.width = 3, + spicc->pow2_div.flags = CLK_DIVIDER_POWER_OF_TWO, + spicc->pow2_div.reg = spicc->base + SPICC_CONREG; + spicc->pow2_div.hw.init = &init; + + spicc->clk = devm_clk_register(dev, &spicc->pow2_div.hw); + if (WARN_ON(IS_ERR(spicc->clk))) + return PTR_ERR(spicc->clk); + + return 0; +} + +static int meson_spicc_enh_clk_init(struct meson_spicc_device *spicc) +{ + struct device *dev = &spicc->pdev->dev; + struct clk_fixed_factor *enh_fixed_div; + struct clk_divider *enh_div; + struct clk_mux *mux; + struct clk_init_data init; + struct clk *clk; + struct clk_parent_data parent_data[2]; + char name[64]; + + memset(&init, 0, sizeof(init)); + memset(&parent_data, 0, sizeof(parent_data)); + + init.parent_data = parent_data; + + /* algorithm for enh div: rate = freq / 2 / (N + 1) */ + + enh_fixed_div = devm_kzalloc(dev, sizeof(*enh_fixed_div), GFP_KERNEL); + if (!enh_fixed_div) + return -ENOMEM; + + snprintf(name, sizeof(name), "%s#enh_fixed_div", dev_name(dev)); + init.name = name; + init.ops = &clk_fixed_factor_ops; + init.flags = 0; + if (spicc->data->has_pclk) + parent_data[0].hw = __clk_get_hw(spicc->pclk); + else + parent_data[0].hw = __clk_get_hw(spicc->core); + init.num_parents = 1; + + enh_fixed_div->mult = 1, + enh_fixed_div->div = 2, + enh_fixed_div->hw.init = &init; + + clk = devm_clk_register(dev, &enh_fixed_div->hw); + if (WARN_ON(IS_ERR(clk))) + return PTR_ERR(clk); + + enh_div = devm_kzalloc(dev, sizeof(*enh_div), GFP_KERNEL); + if (!enh_div) + return -ENOMEM; + + snprintf(name, sizeof(name), "%s#enh_div", dev_name(dev)); + init.name = name; + init.ops = &clk_divider_ops; + init.flags = CLK_SET_RATE_PARENT; + parent_data[0].hw = &enh_fixed_div->hw; + init.num_parents = 1; + + enh_div->shift = 16, + enh_div->width = 8, + enh_div->reg = spicc->base + SPICC_ENH_CTL0; + enh_div->hw.init = &init; + + clk = devm_clk_register(dev, &enh_div->hw); + if (WARN_ON(IS_ERR(clk))) + return PTR_ERR(clk); + + mux = devm_kzalloc(dev, sizeof(*mux), GFP_KERNEL); + if (!mux) + return -ENOMEM; + + snprintf(name, sizeof(name), "%s#sel", dev_name(dev)); + init.name = name; + init.ops = &clk_mux_ops; + parent_data[0].hw = &spicc->pow2_div.hw; + parent_data[1].hw = &enh_div->hw; + init.num_parents = 2; + init.flags = CLK_SET_RATE_PARENT; + + mux->mask = 0x1, + mux->shift = 24, + mux->reg = spicc->base + SPICC_ENH_CTL0; + mux->hw.init = &init; + + spicc->clk = devm_clk_register(dev, &mux->hw); + if (WARN_ON(IS_ERR(spicc->clk))) + return PTR_ERR(spicc->clk); + + return 0; +} + +static int meson_spicc_probe(struct platform_device *pdev) +{ + struct spi_master *master; + struct meson_spicc_device *spicc; + int ret, irq; + + master = spi_alloc_master(&pdev->dev, sizeof(*spicc)); + if (!master) { + dev_err(&pdev->dev, "master allocation failed\n"); + return -ENOMEM; + } + spicc = spi_master_get_devdata(master); + spicc->master = master; + + spicc->data = of_device_get_match_data(&pdev->dev); + if (!spicc->data) { + dev_err(&pdev->dev, "failed to get match data\n"); + ret = -EINVAL; + goto out_master; + } + + spicc->pdev = pdev; + platform_set_drvdata(pdev, spicc); + + spicc->base = devm_platform_ioremap_resource(pdev, 0); + if (IS_ERR(spicc->base)) { + dev_err(&pdev->dev, "io resource mapping failed\n"); + ret = PTR_ERR(spicc->base); + goto out_master; + } + + /* Set master mode and enable controller */ + writel_relaxed(SPICC_ENABLE | SPICC_MODE_MASTER, + spicc->base + SPICC_CONREG); + + /* Disable all IRQs */ + writel_relaxed(0, spicc->base + SPICC_INTREG); + + irq = platform_get_irq(pdev, 0); + if (irq < 0) { + ret = irq; + goto out_master; + } + + ret = devm_request_irq(&pdev->dev, irq, meson_spicc_irq, + 0, NULL, spicc); + if (ret) { + dev_err(&pdev->dev, "irq request failed\n"); + goto out_master; + } + + spicc->core = devm_clk_get(&pdev->dev, "core"); + if (IS_ERR(spicc->core)) { + dev_err(&pdev->dev, "core clock request failed\n"); + ret = PTR_ERR(spicc->core); + goto out_master; + } + + if (spicc->data->has_pclk) { + spicc->pclk = devm_clk_get(&pdev->dev, "pclk"); + if (IS_ERR(spicc->pclk)) { + dev_err(&pdev->dev, "pclk clock request failed\n"); + ret = PTR_ERR(spicc->pclk); + goto out_master; + } + } + + ret = clk_prepare_enable(spicc->core); + if (ret) { + dev_err(&pdev->dev, "core clock enable failed\n"); + goto out_master; + } + + ret = clk_prepare_enable(spicc->pclk); + if (ret) { + dev_err(&pdev->dev, "pclk clock enable failed\n"); + goto out_core_clk; + } + + device_reset_optional(&pdev->dev); + + master->num_chipselect = 4; + master->dev.of_node = pdev->dev.of_node; + master->mode_bits = SPI_CPHA | SPI_CPOL | SPI_CS_HIGH; + master->bits_per_word_mask = SPI_BPW_MASK(32) | + SPI_BPW_MASK(24) | + SPI_BPW_MASK(16) | + SPI_BPW_MASK(8); + master->flags = (SPI_MASTER_MUST_RX | SPI_MASTER_MUST_TX); + master->min_speed_hz = spicc->data->min_speed_hz; + master->max_speed_hz = spicc->data->max_speed_hz; + master->setup = meson_spicc_setup; + master->cleanup = meson_spicc_cleanup; + master->prepare_message = meson_spicc_prepare_message; + master->unprepare_transfer_hardware = meson_spicc_unprepare_transfer; + master->transfer_one = meson_spicc_transfer_one; + master->use_gpio_descriptors = true; + + meson_spicc_oen_enable(spicc); + + ret = meson_spicc_pow2_clk_init(spicc); + if (ret) { + dev_err(&pdev->dev, "pow2 clock registration failed\n"); + goto out_clk; + } + + if (spicc->data->has_enhance_clk_div) { + ret = meson_spicc_enh_clk_init(spicc); + if (ret) { + dev_err(&pdev->dev, "clock registration failed\n"); + goto out_clk; + } + } + + ret = devm_spi_register_master(&pdev->dev, master); + if (ret) { + dev_err(&pdev->dev, "spi master registration failed\n"); + goto out_clk; + } + + return 0; + +out_clk: + clk_disable_unprepare(spicc->pclk); + +out_core_clk: + clk_disable_unprepare(spicc->core); + +out_master: + spi_master_put(master); + + return ret; +} + +static int meson_spicc_remove(struct platform_device *pdev) +{ + struct meson_spicc_device *spicc = platform_get_drvdata(pdev); + + /* Disable SPI */ + writel(0, spicc->base + SPICC_CONREG); + + clk_disable_unprepare(spicc->core); + clk_disable_unprepare(spicc->pclk); + + spi_master_put(spicc->master); + + return 0; +} + +static const struct meson_spicc_data meson_spicc_gx_data = { + .max_speed_hz = 30000000, + .min_speed_hz = 325000, + .fifo_size = 16, +}; + +static const struct meson_spicc_data meson_spicc_axg_data = { + .max_speed_hz = 80000000, + .min_speed_hz = 325000, + .fifo_size = 16, + .has_oen = true, + .has_enhance_clk_div = true, +}; + +static const struct meson_spicc_data meson_spicc_g12a_data = { + .max_speed_hz = 166666666, + .min_speed_hz = 50000, + .fifo_size = 15, + .has_oen = true, + .has_enhance_clk_div = true, + .has_pclk = true, +}; + +static const struct of_device_id meson_spicc_of_match[] = { + { + .compatible = "amlogic,meson-gx-spicc", + .data = &meson_spicc_gx_data, + }, + { + .compatible = "amlogic,meson-axg-spicc", + .data = &meson_spicc_axg_data, + }, + { + .compatible = "amlogic,meson-g12a-spicc", + .data = &meson_spicc_g12a_data, + }, + { /* sentinel */ } +}; +MODULE_DEVICE_TABLE(of, meson_spicc_of_match); + +static struct platform_driver meson_spicc_driver = { + .probe = meson_spicc_probe, + .remove = meson_spicc_remove, + .driver = { + .name = "meson-spicc", + .of_match_table = of_match_ptr(meson_spicc_of_match), + }, +}; + +module_platform_driver(meson_spicc_driver); + +MODULE_DESCRIPTION("Meson SPI Communication Controller driver"); +MODULE_AUTHOR("Neil Armstrong <narmstrong@baylibre.com>"); +MODULE_LICENSE("GPL"); diff --git a/drivers/spi/spi-meson-spifc.c b/drivers/spi/spi-meson-spifc.c new file mode 100644 index 000000000..c8ed7815c --- /dev/null +++ b/drivers/spi/spi-meson-spifc.c @@ -0,0 +1,457 @@ +// SPDX-License-Identifier: GPL-2.0+ +// +// Driver for Amlogic Meson SPI flash controller (SPIFC) +// +// Copyright (C) 2014 Beniamino Galvani <b.galvani@gmail.com> +// + +#include <linux/clk.h> +#include <linux/delay.h> +#include <linux/device.h> +#include <linux/io.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/of.h> +#include <linux/platform_device.h> +#include <linux/pm_runtime.h> +#include <linux/regmap.h> +#include <linux/spi/spi.h> +#include <linux/types.h> + +/* register map */ +#define REG_CMD 0x00 +#define REG_ADDR 0x04 +#define REG_CTRL 0x08 +#define REG_CTRL1 0x0c +#define REG_STATUS 0x10 +#define REG_CTRL2 0x14 +#define REG_CLOCK 0x18 +#define REG_USER 0x1c +#define REG_USER1 0x20 +#define REG_USER2 0x24 +#define REG_USER3 0x28 +#define REG_USER4 0x2c +#define REG_SLAVE 0x30 +#define REG_SLAVE1 0x34 +#define REG_SLAVE2 0x38 +#define REG_SLAVE3 0x3c +#define REG_C0 0x40 +#define REG_B8 0x60 +#define REG_MAX 0x7c + +/* register fields */ +#define CMD_USER BIT(18) +#define CTRL_ENABLE_AHB BIT(17) +#define CLOCK_SOURCE BIT(31) +#define CLOCK_DIV_SHIFT 12 +#define CLOCK_DIV_MASK (0x3f << CLOCK_DIV_SHIFT) +#define CLOCK_CNT_HIGH_SHIFT 6 +#define CLOCK_CNT_HIGH_MASK (0x3f << CLOCK_CNT_HIGH_SHIFT) +#define CLOCK_CNT_LOW_SHIFT 0 +#define CLOCK_CNT_LOW_MASK (0x3f << CLOCK_CNT_LOW_SHIFT) +#define USER_DIN_EN_MS BIT(0) +#define USER_CMP_MODE BIT(2) +#define USER_UC_DOUT_SEL BIT(27) +#define USER_UC_DIN_SEL BIT(28) +#define USER_UC_MASK ((BIT(5) - 1) << 27) +#define USER1_BN_UC_DOUT_SHIFT 17 +#define USER1_BN_UC_DOUT_MASK (0xff << 16) +#define USER1_BN_UC_DIN_SHIFT 8 +#define USER1_BN_UC_DIN_MASK (0xff << 8) +#define USER4_CS_ACT BIT(30) +#define SLAVE_TRST_DONE BIT(4) +#define SLAVE_OP_MODE BIT(30) +#define SLAVE_SW_RST BIT(31) + +#define SPIFC_BUFFER_SIZE 64 + +/** + * struct meson_spifc + * @master: the SPI master + * @regmap: regmap for device registers + * @clk: input clock of the built-in baud rate generator + * @dev: the device structure + */ +struct meson_spifc { + struct spi_master *master; + struct regmap *regmap; + struct clk *clk; + struct device *dev; +}; + +static const struct regmap_config spifc_regmap_config = { + .reg_bits = 32, + .val_bits = 32, + .reg_stride = 4, + .max_register = REG_MAX, +}; + +/** + * meson_spifc_wait_ready() - wait for the current operation to terminate + * @spifc: the Meson SPI device + * Return: 0 on success, a negative value on error + */ +static int meson_spifc_wait_ready(struct meson_spifc *spifc) +{ + unsigned long deadline = jiffies + msecs_to_jiffies(5); + u32 data; + + do { + regmap_read(spifc->regmap, REG_SLAVE, &data); + if (data & SLAVE_TRST_DONE) + return 0; + cond_resched(); + } while (!time_after(jiffies, deadline)); + + return -ETIMEDOUT; +} + +/** + * meson_spifc_drain_buffer() - copy data from device buffer to memory + * @spifc: the Meson SPI device + * @buf: the destination buffer + * @len: number of bytes to copy + */ +static void meson_spifc_drain_buffer(struct meson_spifc *spifc, u8 *buf, + int len) +{ + u32 data; + int i = 0; + + while (i < len) { + regmap_read(spifc->regmap, REG_C0 + i, &data); + + if (len - i >= 4) { + *((u32 *)buf) = data; + buf += 4; + } else { + memcpy(buf, &data, len - i); + break; + } + i += 4; + } +} + +/** + * meson_spifc_fill_buffer() - copy data from memory to device buffer + * @spifc: the Meson SPI device + * @buf: the source buffer + * @len: number of bytes to copy + */ +static void meson_spifc_fill_buffer(struct meson_spifc *spifc, const u8 *buf, + int len) +{ + u32 data; + int i = 0; + + while (i < len) { + if (len - i >= 4) + data = *(u32 *)buf; + else + memcpy(&data, buf, len - i); + + regmap_write(spifc->regmap, REG_C0 + i, data); + + buf += 4; + i += 4; + } +} + +/** + * meson_spifc_setup_speed() - program the clock divider + * @spifc: the Meson SPI device + * @speed: desired speed in Hz + */ +static void meson_spifc_setup_speed(struct meson_spifc *spifc, u32 speed) +{ + unsigned long parent, value; + int n; + + parent = clk_get_rate(spifc->clk); + n = max_t(int, parent / speed - 1, 1); + + dev_dbg(spifc->dev, "parent %lu, speed %u, n %d\n", parent, + speed, n); + + value = (n << CLOCK_DIV_SHIFT) & CLOCK_DIV_MASK; + value |= (n << CLOCK_CNT_LOW_SHIFT) & CLOCK_CNT_LOW_MASK; + value |= (((n + 1) / 2 - 1) << CLOCK_CNT_HIGH_SHIFT) & + CLOCK_CNT_HIGH_MASK; + + regmap_write(spifc->regmap, REG_CLOCK, value); +} + +/** + * meson_spifc_txrx() - transfer a chunk of data + * @spifc: the Meson SPI device + * @xfer: the current SPI transfer + * @offset: offset of the data to transfer + * @len: length of the data to transfer + * @last_xfer: whether this is the last transfer of the message + * @last_chunk: whether this is the last chunk of the transfer + * Return: 0 on success, a negative value on error + */ +static int meson_spifc_txrx(struct meson_spifc *spifc, + struct spi_transfer *xfer, + int offset, int len, bool last_xfer, + bool last_chunk) +{ + bool keep_cs = true; + int ret; + + if (xfer->tx_buf) + meson_spifc_fill_buffer(spifc, xfer->tx_buf + offset, len); + + /* enable DOUT stage */ + regmap_update_bits(spifc->regmap, REG_USER, USER_UC_MASK, + USER_UC_DOUT_SEL); + regmap_write(spifc->regmap, REG_USER1, + (8 * len - 1) << USER1_BN_UC_DOUT_SHIFT); + + /* enable data input during DOUT */ + regmap_update_bits(spifc->regmap, REG_USER, USER_DIN_EN_MS, + USER_DIN_EN_MS); + + if (last_chunk) { + if (last_xfer) + keep_cs = xfer->cs_change; + else + keep_cs = !xfer->cs_change; + } + + regmap_update_bits(spifc->regmap, REG_USER4, USER4_CS_ACT, + keep_cs ? USER4_CS_ACT : 0); + + /* clear transition done bit */ + regmap_update_bits(spifc->regmap, REG_SLAVE, SLAVE_TRST_DONE, 0); + /* start transfer */ + regmap_update_bits(spifc->regmap, REG_CMD, CMD_USER, CMD_USER); + + ret = meson_spifc_wait_ready(spifc); + + if (!ret && xfer->rx_buf) + meson_spifc_drain_buffer(spifc, xfer->rx_buf + offset, len); + + return ret; +} + +/** + * meson_spifc_transfer_one() - perform a single transfer + * @master: the SPI master + * @spi: the SPI device + * @xfer: the current SPI transfer + * Return: 0 on success, a negative value on error + */ +static int meson_spifc_transfer_one(struct spi_master *master, + struct spi_device *spi, + struct spi_transfer *xfer) +{ + struct meson_spifc *spifc = spi_master_get_devdata(master); + int len, done = 0, ret = 0; + + meson_spifc_setup_speed(spifc, xfer->speed_hz); + + regmap_update_bits(spifc->regmap, REG_CTRL, CTRL_ENABLE_AHB, 0); + + while (done < xfer->len && !ret) { + len = min_t(int, xfer->len - done, SPIFC_BUFFER_SIZE); + ret = meson_spifc_txrx(spifc, xfer, done, len, + spi_transfer_is_last(master, xfer), + done + len >= xfer->len); + done += len; + } + + regmap_update_bits(spifc->regmap, REG_CTRL, CTRL_ENABLE_AHB, + CTRL_ENABLE_AHB); + + return ret; +} + +/** + * meson_spifc_hw_init() - reset and initialize the SPI controller + * @spifc: the Meson SPI device + */ +static void meson_spifc_hw_init(struct meson_spifc *spifc) +{ + /* reset device */ + regmap_update_bits(spifc->regmap, REG_SLAVE, SLAVE_SW_RST, + SLAVE_SW_RST); + /* disable compatible mode */ + regmap_update_bits(spifc->regmap, REG_USER, USER_CMP_MODE, 0); + /* set master mode */ + regmap_update_bits(spifc->regmap, REG_SLAVE, SLAVE_OP_MODE, 0); +} + +static int meson_spifc_probe(struct platform_device *pdev) +{ + struct spi_master *master; + struct meson_spifc *spifc; + void __iomem *base; + unsigned int rate; + int ret = 0; + + master = spi_alloc_master(&pdev->dev, sizeof(struct meson_spifc)); + if (!master) + return -ENOMEM; + + platform_set_drvdata(pdev, master); + + spifc = spi_master_get_devdata(master); + spifc->dev = &pdev->dev; + + base = devm_platform_ioremap_resource(pdev, 0); + if (IS_ERR(base)) { + ret = PTR_ERR(base); + goto out_err; + } + + spifc->regmap = devm_regmap_init_mmio(spifc->dev, base, + &spifc_regmap_config); + if (IS_ERR(spifc->regmap)) { + ret = PTR_ERR(spifc->regmap); + goto out_err; + } + + spifc->clk = devm_clk_get(spifc->dev, NULL); + if (IS_ERR(spifc->clk)) { + dev_err(spifc->dev, "missing clock\n"); + ret = PTR_ERR(spifc->clk); + goto out_err; + } + + ret = clk_prepare_enable(spifc->clk); + if (ret) { + dev_err(spifc->dev, "can't prepare clock\n"); + goto out_err; + } + + rate = clk_get_rate(spifc->clk); + + master->num_chipselect = 1; + master->dev.of_node = pdev->dev.of_node; + master->bits_per_word_mask = SPI_BPW_MASK(8); + master->auto_runtime_pm = true; + master->transfer_one = meson_spifc_transfer_one; + master->min_speed_hz = rate >> 6; + master->max_speed_hz = rate >> 1; + + meson_spifc_hw_init(spifc); + + pm_runtime_set_active(spifc->dev); + pm_runtime_enable(spifc->dev); + + ret = devm_spi_register_master(spifc->dev, master); + if (ret) { + dev_err(spifc->dev, "failed to register spi master\n"); + goto out_clk; + } + + return 0; +out_clk: + clk_disable_unprepare(spifc->clk); + pm_runtime_disable(spifc->dev); +out_err: + spi_master_put(master); + return ret; +} + +static int meson_spifc_remove(struct platform_device *pdev) +{ + struct spi_master *master = platform_get_drvdata(pdev); + struct meson_spifc *spifc = spi_master_get_devdata(master); + + pm_runtime_get_sync(&pdev->dev); + clk_disable_unprepare(spifc->clk); + pm_runtime_disable(&pdev->dev); + + return 0; +} + +#ifdef CONFIG_PM_SLEEP +static int meson_spifc_suspend(struct device *dev) +{ + struct spi_master *master = dev_get_drvdata(dev); + struct meson_spifc *spifc = spi_master_get_devdata(master); + int ret; + + ret = spi_master_suspend(master); + if (ret) + return ret; + + if (!pm_runtime_suspended(dev)) + clk_disable_unprepare(spifc->clk); + + return 0; +} + +static int meson_spifc_resume(struct device *dev) +{ + struct spi_master *master = dev_get_drvdata(dev); + struct meson_spifc *spifc = spi_master_get_devdata(master); + int ret; + + if (!pm_runtime_suspended(dev)) { + ret = clk_prepare_enable(spifc->clk); + if (ret) + return ret; + } + + meson_spifc_hw_init(spifc); + + ret = spi_master_resume(master); + if (ret) + clk_disable_unprepare(spifc->clk); + + return ret; +} +#endif /* CONFIG_PM_SLEEP */ + +#ifdef CONFIG_PM +static int meson_spifc_runtime_suspend(struct device *dev) +{ + struct spi_master *master = dev_get_drvdata(dev); + struct meson_spifc *spifc = spi_master_get_devdata(master); + + clk_disable_unprepare(spifc->clk); + + return 0; +} + +static int meson_spifc_runtime_resume(struct device *dev) +{ + struct spi_master *master = dev_get_drvdata(dev); + struct meson_spifc *spifc = spi_master_get_devdata(master); + + return clk_prepare_enable(spifc->clk); +} +#endif /* CONFIG_PM */ + +static const struct dev_pm_ops meson_spifc_pm_ops = { + SET_SYSTEM_SLEEP_PM_OPS(meson_spifc_suspend, meson_spifc_resume) + SET_RUNTIME_PM_OPS(meson_spifc_runtime_suspend, + meson_spifc_runtime_resume, + NULL) +}; + +static const struct of_device_id meson_spifc_dt_match[] = { + { .compatible = "amlogic,meson6-spifc", }, + { .compatible = "amlogic,meson-gxbb-spifc", }, + { }, +}; +MODULE_DEVICE_TABLE(of, meson_spifc_dt_match); + +static struct platform_driver meson_spifc_driver = { + .probe = meson_spifc_probe, + .remove = meson_spifc_remove, + .driver = { + .name = "meson-spifc", + .of_match_table = of_match_ptr(meson_spifc_dt_match), + .pm = &meson_spifc_pm_ops, + }, +}; + +module_platform_driver(meson_spifc_driver); + +MODULE_AUTHOR("Beniamino Galvani <b.galvani@gmail.com>"); +MODULE_DESCRIPTION("Amlogic Meson SPIFC driver"); +MODULE_LICENSE("GPL v2"); diff --git a/drivers/spi/spi-mpc512x-psc.c b/drivers/spi/spi-mpc512x-psc.c new file mode 100644 index 000000000..ea1b07953 --- /dev/null +++ b/drivers/spi/spi-mpc512x-psc.c @@ -0,0 +1,627 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * MPC512x PSC in SPI mode driver. + * + * Copyright (C) 2007,2008 Freescale Semiconductor Inc. + * Original port from 52xx driver: + * Hongjun Chen <hong-jun.chen@freescale.com> + * + * Fork of mpc52xx_psc_spi.c: + * Copyright (C) 2006 TOPTICA Photonics AG., Dragos Carp + */ + +#include <linux/module.h> +#include <linux/kernel.h> +#include <linux/errno.h> +#include <linux/interrupt.h> +#include <linux/of_address.h> +#include <linux/of_irq.h> +#include <linux/of_platform.h> +#include <linux/completion.h> +#include <linux/io.h> +#include <linux/delay.h> +#include <linux/clk.h> +#include <linux/spi/spi.h> +#include <linux/fsl_devices.h> +#include <linux/gpio.h> +#include <asm/mpc52xx_psc.h> + +enum { + TYPE_MPC5121, + TYPE_MPC5125, +}; + +/* + * This macro abstracts the differences in the PSC register layout between + * MPC5121 (which uses a struct mpc52xx_psc) and MPC5125 (using mpc5125_psc). + */ +#define psc_addr(mps, regname) ({ \ + void *__ret = NULL; \ + switch (mps->type) { \ + case TYPE_MPC5121: { \ + struct mpc52xx_psc __iomem *psc = mps->psc; \ + __ret = &psc->regname; \ + }; \ + break; \ + case TYPE_MPC5125: { \ + struct mpc5125_psc __iomem *psc = mps->psc; \ + __ret = &psc->regname; \ + }; \ + break; \ + } \ + __ret; }) + +struct mpc512x_psc_spi { + void (*cs_control)(struct spi_device *spi, bool on); + + /* driver internal data */ + int type; + void __iomem *psc; + struct mpc512x_psc_fifo __iomem *fifo; + unsigned int irq; + u8 bits_per_word; + struct clk *clk_mclk; + struct clk *clk_ipg; + u32 mclk_rate; + + struct completion txisrdone; +}; + +/* controller state */ +struct mpc512x_psc_spi_cs { + int bits_per_word; + int speed_hz; +}; + +/* set clock freq, clock ramp, bits per work + * if t is NULL then reset the values to the default values + */ +static int mpc512x_psc_spi_transfer_setup(struct spi_device *spi, + struct spi_transfer *t) +{ + struct mpc512x_psc_spi_cs *cs = spi->controller_state; + + cs->speed_hz = (t && t->speed_hz) + ? t->speed_hz : spi->max_speed_hz; + cs->bits_per_word = (t && t->bits_per_word) + ? t->bits_per_word : spi->bits_per_word; + cs->bits_per_word = ((cs->bits_per_word + 7) / 8) * 8; + return 0; +} + +static void mpc512x_psc_spi_activate_cs(struct spi_device *spi) +{ + struct mpc512x_psc_spi_cs *cs = spi->controller_state; + struct mpc512x_psc_spi *mps = spi_master_get_devdata(spi->master); + u32 sicr; + u32 ccr; + int speed; + u16 bclkdiv; + + sicr = in_be32(psc_addr(mps, sicr)); + + /* Set clock phase and polarity */ + if (spi->mode & SPI_CPHA) + sicr |= 0x00001000; + else + sicr &= ~0x00001000; + + if (spi->mode & SPI_CPOL) + sicr |= 0x00002000; + else + sicr &= ~0x00002000; + + if (spi->mode & SPI_LSB_FIRST) + sicr |= 0x10000000; + else + sicr &= ~0x10000000; + out_be32(psc_addr(mps, sicr), sicr); + + ccr = in_be32(psc_addr(mps, ccr)); + ccr &= 0xFF000000; + speed = cs->speed_hz; + if (!speed) + speed = 1000000; /* default 1MHz */ + bclkdiv = (mps->mclk_rate / speed) - 1; + + ccr |= (((bclkdiv & 0xff) << 16) | (((bclkdiv >> 8) & 0xff) << 8)); + out_be32(psc_addr(mps, ccr), ccr); + mps->bits_per_word = cs->bits_per_word; + + if (mps->cs_control && gpio_is_valid(spi->cs_gpio)) + mps->cs_control(spi, (spi->mode & SPI_CS_HIGH) ? 1 : 0); +} + +static void mpc512x_psc_spi_deactivate_cs(struct spi_device *spi) +{ + struct mpc512x_psc_spi *mps = spi_master_get_devdata(spi->master); + + if (mps->cs_control && gpio_is_valid(spi->cs_gpio)) + mps->cs_control(spi, (spi->mode & SPI_CS_HIGH) ? 0 : 1); + +} + +/* extract and scale size field in txsz or rxsz */ +#define MPC512x_PSC_FIFO_SZ(sz) ((sz & 0x7ff) << 2); + +#define EOFBYTE 1 + +static int mpc512x_psc_spi_transfer_rxtx(struct spi_device *spi, + struct spi_transfer *t) +{ + struct mpc512x_psc_spi *mps = spi_master_get_devdata(spi->master); + struct mpc512x_psc_fifo __iomem *fifo = mps->fifo; + size_t tx_len = t->len; + size_t rx_len = t->len; + u8 *tx_buf = (u8 *)t->tx_buf; + u8 *rx_buf = (u8 *)t->rx_buf; + + if (!tx_buf && !rx_buf && t->len) + return -EINVAL; + + while (rx_len || tx_len) { + size_t txcount; + u8 data; + size_t fifosz; + size_t rxcount; + int rxtries; + + /* + * send the TX bytes in as large a chunk as possible + * but neither exceed the TX nor the RX FIFOs + */ + fifosz = MPC512x_PSC_FIFO_SZ(in_be32(&fifo->txsz)); + txcount = min(fifosz, tx_len); + fifosz = MPC512x_PSC_FIFO_SZ(in_be32(&fifo->rxsz)); + fifosz -= in_be32(&fifo->rxcnt) + 1; + txcount = min(fifosz, txcount); + if (txcount) { + + /* fill the TX FIFO */ + while (txcount-- > 0) { + data = tx_buf ? *tx_buf++ : 0; + if (tx_len == EOFBYTE && t->cs_change) + setbits32(&fifo->txcmd, + MPC512x_PSC_FIFO_EOF); + out_8(&fifo->txdata_8, data); + tx_len--; + } + + /* have the ISR trigger when the TX FIFO is empty */ + reinit_completion(&mps->txisrdone); + out_be32(&fifo->txisr, MPC512x_PSC_FIFO_EMPTY); + out_be32(&fifo->tximr, MPC512x_PSC_FIFO_EMPTY); + wait_for_completion(&mps->txisrdone); + } + + /* + * consume as much RX data as the FIFO holds, while we + * iterate over the transfer's TX data length + * + * only insist in draining all the remaining RX bytes + * when the TX bytes were exhausted (that's at the very + * end of this transfer, not when still iterating over + * the transfer's chunks) + */ + rxtries = 50; + do { + + /* + * grab whatever was in the FIFO when we started + * looking, don't bother fetching what was added to + * the FIFO while we read from it -- we'll return + * here eventually and prefer sending out remaining + * TX data + */ + fifosz = in_be32(&fifo->rxcnt); + rxcount = min(fifosz, rx_len); + while (rxcount-- > 0) { + data = in_8(&fifo->rxdata_8); + if (rx_buf) + *rx_buf++ = data; + rx_len--; + } + + /* + * come back later if there still is TX data to send, + * bail out of the RX drain loop if all of the TX data + * was sent and all of the RX data was received (i.e. + * when the transmission has completed) + */ + if (tx_len) + break; + if (!rx_len) + break; + + /* + * TX data transmission has completed while RX data + * is still pending -- that's a transient situation + * which depends on wire speed and specific + * hardware implementation details (buffering) yet + * should resolve very quickly + * + * just yield for a moment to not hog the CPU for + * too long when running SPI at low speed + * + * the timeout range is rather arbitrary and tries + * to balance throughput against system load; the + * chosen values result in a minimal timeout of 50 + * times 10us and thus work at speeds as low as + * some 20kbps, while the maximum timeout at the + * transfer's end could be 5ms _if_ nothing else + * ticks in the system _and_ RX data still wasn't + * received, which only occurs in situations that + * are exceptional; removing the unpredictability + * of the timeout either decreases throughput + * (longer timeouts), or puts more load on the + * system (fixed short timeouts) or requires the + * use of a timeout API instead of a counter and an + * unknown inner delay + */ + usleep_range(10, 100); + + } while (--rxtries > 0); + if (!tx_len && rx_len && !rxtries) { + /* + * not enough RX bytes even after several retries + * and the resulting rather long timeout? + */ + rxcount = in_be32(&fifo->rxcnt); + dev_warn(&spi->dev, + "short xfer, missing %zd RX bytes, FIFO level %zd\n", + rx_len, rxcount); + } + + /* + * drain and drop RX data which "should not be there" in + * the first place, for undisturbed transmission this turns + * into a NOP (except for the FIFO level fetch) + */ + if (!tx_len && !rx_len) { + while (in_be32(&fifo->rxcnt)) + in_8(&fifo->rxdata_8); + } + + } + return 0; +} + +static int mpc512x_psc_spi_msg_xfer(struct spi_master *master, + struct spi_message *m) +{ + struct spi_device *spi; + unsigned cs_change; + int status; + struct spi_transfer *t; + + spi = m->spi; + cs_change = 1; + status = 0; + list_for_each_entry(t, &m->transfers, transfer_list) { + status = mpc512x_psc_spi_transfer_setup(spi, t); + if (status < 0) + break; + + if (cs_change) + mpc512x_psc_spi_activate_cs(spi); + cs_change = t->cs_change; + + status = mpc512x_psc_spi_transfer_rxtx(spi, t); + if (status) + break; + m->actual_length += t->len; + + spi_transfer_delay_exec(t); + + if (cs_change) + mpc512x_psc_spi_deactivate_cs(spi); + } + + m->status = status; + if (m->complete) + m->complete(m->context); + + if (status || !cs_change) + mpc512x_psc_spi_deactivate_cs(spi); + + mpc512x_psc_spi_transfer_setup(spi, NULL); + + spi_finalize_current_message(master); + return status; +} + +static int mpc512x_psc_spi_prep_xfer_hw(struct spi_master *master) +{ + struct mpc512x_psc_spi *mps = spi_master_get_devdata(master); + + dev_dbg(&master->dev, "%s()\n", __func__); + + /* Zero MR2 */ + in_8(psc_addr(mps, mr2)); + out_8(psc_addr(mps, mr2), 0x0); + + /* enable transmitter/receiver */ + out_8(psc_addr(mps, command), MPC52xx_PSC_TX_ENABLE | MPC52xx_PSC_RX_ENABLE); + + return 0; +} + +static int mpc512x_psc_spi_unprep_xfer_hw(struct spi_master *master) +{ + struct mpc512x_psc_spi *mps = spi_master_get_devdata(master); + struct mpc512x_psc_fifo __iomem *fifo = mps->fifo; + + dev_dbg(&master->dev, "%s()\n", __func__); + + /* disable transmitter/receiver and fifo interrupt */ + out_8(psc_addr(mps, command), MPC52xx_PSC_TX_DISABLE | MPC52xx_PSC_RX_DISABLE); + out_be32(&fifo->tximr, 0); + + return 0; +} + +static int mpc512x_psc_spi_setup(struct spi_device *spi) +{ + struct mpc512x_psc_spi_cs *cs = spi->controller_state; + int ret; + + if (spi->bits_per_word % 8) + return -EINVAL; + + if (!cs) { + cs = kzalloc(sizeof *cs, GFP_KERNEL); + if (!cs) + return -ENOMEM; + + if (gpio_is_valid(spi->cs_gpio)) { + ret = gpio_request(spi->cs_gpio, dev_name(&spi->dev)); + if (ret) { + dev_err(&spi->dev, "can't get CS gpio: %d\n", + ret); + kfree(cs); + return ret; + } + gpio_direction_output(spi->cs_gpio, + spi->mode & SPI_CS_HIGH ? 0 : 1); + } + + spi->controller_state = cs; + } + + cs->bits_per_word = spi->bits_per_word; + cs->speed_hz = spi->max_speed_hz; + + return 0; +} + +static void mpc512x_psc_spi_cleanup(struct spi_device *spi) +{ + if (gpio_is_valid(spi->cs_gpio)) + gpio_free(spi->cs_gpio); + kfree(spi->controller_state); +} + +static int mpc512x_psc_spi_port_config(struct spi_master *master, + struct mpc512x_psc_spi *mps) +{ + struct mpc512x_psc_fifo __iomem *fifo = mps->fifo; + u32 sicr; + u32 ccr; + int speed; + u16 bclkdiv; + + /* Reset the PSC into a known state */ + out_8(psc_addr(mps, command), MPC52xx_PSC_RST_RX); + out_8(psc_addr(mps, command), MPC52xx_PSC_RST_TX); + out_8(psc_addr(mps, command), MPC52xx_PSC_TX_DISABLE | MPC52xx_PSC_RX_DISABLE); + + /* Disable psc interrupts all useful interrupts are in fifo */ + out_be16(psc_addr(mps, isr_imr.imr), 0); + + /* Disable fifo interrupts, will be enabled later */ + out_be32(&fifo->tximr, 0); + out_be32(&fifo->rximr, 0); + + /* Setup fifo slice address and size */ + /*out_be32(&fifo->txsz, 0x0fe00004);*/ + /*out_be32(&fifo->rxsz, 0x0ff00004);*/ + + sicr = 0x01000000 | /* SIM = 0001 -- 8 bit */ + 0x00800000 | /* GenClk = 1 -- internal clk */ + 0x00008000 | /* SPI = 1 */ + 0x00004000 | /* MSTR = 1 -- SPI master */ + 0x00000800; /* UseEOF = 1 -- SS low until EOF */ + + out_be32(psc_addr(mps, sicr), sicr); + + ccr = in_be32(psc_addr(mps, ccr)); + ccr &= 0xFF000000; + speed = 1000000; /* default 1MHz */ + bclkdiv = (mps->mclk_rate / speed) - 1; + ccr |= (((bclkdiv & 0xff) << 16) | (((bclkdiv >> 8) & 0xff) << 8)); + out_be32(psc_addr(mps, ccr), ccr); + + /* Set 2ms DTL delay */ + out_8(psc_addr(mps, ctur), 0x00); + out_8(psc_addr(mps, ctlr), 0x82); + + /* we don't use the alarms */ + out_be32(&fifo->rxalarm, 0xfff); + out_be32(&fifo->txalarm, 0); + + /* Enable FIFO slices for Rx/Tx */ + out_be32(&fifo->rxcmd, + MPC512x_PSC_FIFO_ENABLE_SLICE | MPC512x_PSC_FIFO_ENABLE_DMA); + out_be32(&fifo->txcmd, + MPC512x_PSC_FIFO_ENABLE_SLICE | MPC512x_PSC_FIFO_ENABLE_DMA); + + mps->bits_per_word = 8; + + return 0; +} + +static irqreturn_t mpc512x_psc_spi_isr(int irq, void *dev_id) +{ + struct mpc512x_psc_spi *mps = (struct mpc512x_psc_spi *)dev_id; + struct mpc512x_psc_fifo __iomem *fifo = mps->fifo; + + /* clear interrupt and wake up the rx/tx routine */ + if (in_be32(&fifo->txisr) & + in_be32(&fifo->tximr) & MPC512x_PSC_FIFO_EMPTY) { + out_be32(&fifo->txisr, MPC512x_PSC_FIFO_EMPTY); + out_be32(&fifo->tximr, 0); + complete(&mps->txisrdone); + return IRQ_HANDLED; + } + return IRQ_NONE; +} + +static void mpc512x_spi_cs_control(struct spi_device *spi, bool onoff) +{ + gpio_set_value(spi->cs_gpio, onoff); +} + +static int mpc512x_psc_spi_do_probe(struct device *dev, u32 regaddr, + u32 size, unsigned int irq) +{ + struct fsl_spi_platform_data *pdata = dev_get_platdata(dev); + struct mpc512x_psc_spi *mps; + struct spi_master *master; + int ret; + void *tempp; + struct clk *clk; + + master = spi_alloc_master(dev, sizeof *mps); + if (master == NULL) + return -ENOMEM; + + dev_set_drvdata(dev, master); + mps = spi_master_get_devdata(master); + mps->type = (int)of_device_get_match_data(dev); + mps->irq = irq; + + if (pdata == NULL) { + mps->cs_control = mpc512x_spi_cs_control; + } else { + mps->cs_control = pdata->cs_control; + master->bus_num = pdata->bus_num; + master->num_chipselect = pdata->max_chipselect; + } + + master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH | SPI_LSB_FIRST; + master->setup = mpc512x_psc_spi_setup; + master->prepare_transfer_hardware = mpc512x_psc_spi_prep_xfer_hw; + master->transfer_one_message = mpc512x_psc_spi_msg_xfer; + master->unprepare_transfer_hardware = mpc512x_psc_spi_unprep_xfer_hw; + master->cleanup = mpc512x_psc_spi_cleanup; + master->dev.of_node = dev->of_node; + + tempp = devm_ioremap(dev, regaddr, size); + if (!tempp) { + dev_err(dev, "could not ioremap I/O port range\n"); + ret = -EFAULT; + goto free_master; + } + mps->psc = tempp; + mps->fifo = + (struct mpc512x_psc_fifo *)(tempp + sizeof(struct mpc52xx_psc)); + ret = devm_request_irq(dev, mps->irq, mpc512x_psc_spi_isr, IRQF_SHARED, + "mpc512x-psc-spi", mps); + if (ret) + goto free_master; + init_completion(&mps->txisrdone); + + clk = devm_clk_get(dev, "mclk"); + if (IS_ERR(clk)) { + ret = PTR_ERR(clk); + goto free_master; + } + ret = clk_prepare_enable(clk); + if (ret) + goto free_master; + mps->clk_mclk = clk; + mps->mclk_rate = clk_get_rate(clk); + + clk = devm_clk_get(dev, "ipg"); + if (IS_ERR(clk)) { + ret = PTR_ERR(clk); + goto free_mclk_clock; + } + ret = clk_prepare_enable(clk); + if (ret) + goto free_mclk_clock; + mps->clk_ipg = clk; + + ret = mpc512x_psc_spi_port_config(master, mps); + if (ret < 0) + goto free_ipg_clock; + + ret = devm_spi_register_master(dev, master); + if (ret < 0) + goto free_ipg_clock; + + return ret; + +free_ipg_clock: + clk_disable_unprepare(mps->clk_ipg); +free_mclk_clock: + clk_disable_unprepare(mps->clk_mclk); +free_master: + spi_master_put(master); + + return ret; +} + +static int mpc512x_psc_spi_do_remove(struct device *dev) +{ + struct spi_master *master = dev_get_drvdata(dev); + struct mpc512x_psc_spi *mps = spi_master_get_devdata(master); + + clk_disable_unprepare(mps->clk_mclk); + clk_disable_unprepare(mps->clk_ipg); + + return 0; +} + +static int mpc512x_psc_spi_of_probe(struct platform_device *op) +{ + const u32 *regaddr_p; + u64 regaddr64, size64; + + regaddr_p = of_get_address(op->dev.of_node, 0, &size64, NULL); + if (!regaddr_p) { + dev_err(&op->dev, "Invalid PSC address\n"); + return -EINVAL; + } + regaddr64 = of_translate_address(op->dev.of_node, regaddr_p); + + return mpc512x_psc_spi_do_probe(&op->dev, (u32) regaddr64, (u32) size64, + irq_of_parse_and_map(op->dev.of_node, 0)); +} + +static int mpc512x_psc_spi_of_remove(struct platform_device *op) +{ + return mpc512x_psc_spi_do_remove(&op->dev); +} + +static const struct of_device_id mpc512x_psc_spi_of_match[] = { + { .compatible = "fsl,mpc5121-psc-spi", .data = (void *)TYPE_MPC5121 }, + { .compatible = "fsl,mpc5125-psc-spi", .data = (void *)TYPE_MPC5125 }, + {}, +}; + +MODULE_DEVICE_TABLE(of, mpc512x_psc_spi_of_match); + +static struct platform_driver mpc512x_psc_spi_of_driver = { + .probe = mpc512x_psc_spi_of_probe, + .remove = mpc512x_psc_spi_of_remove, + .driver = { + .name = "mpc512x-psc-spi", + .of_match_table = mpc512x_psc_spi_of_match, + }, +}; +module_platform_driver(mpc512x_psc_spi_of_driver); + +MODULE_AUTHOR("John Rigby"); +MODULE_DESCRIPTION("MPC512x PSC SPI Driver"); +MODULE_LICENSE("GPL"); diff --git a/drivers/spi/spi-mpc52xx-psc.c b/drivers/spi/spi-mpc52xx-psc.c new file mode 100644 index 000000000..17935e71b --- /dev/null +++ b/drivers/spi/spi-mpc52xx-psc.c @@ -0,0 +1,502 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * MPC52xx PSC in SPI mode driver. + * + * Maintainer: Dragos Carp + * + * Copyright (C) 2006 TOPTICA Photonics AG. + */ + +#include <linux/module.h> +#include <linux/types.h> +#include <linux/errno.h> +#include <linux/interrupt.h> +#include <linux/of_address.h> +#include <linux/of_platform.h> +#include <linux/workqueue.h> +#include <linux/completion.h> +#include <linux/io.h> +#include <linux/delay.h> +#include <linux/spi/spi.h> +#include <linux/fsl_devices.h> +#include <linux/slab.h> + +#include <asm/mpc52xx.h> +#include <asm/mpc52xx_psc.h> + +#define MCLK 20000000 /* PSC port MClk in hz */ + +struct mpc52xx_psc_spi { + /* fsl_spi_platform data */ + void (*cs_control)(struct spi_device *spi, bool on); + u32 sysclk; + + /* driver internal data */ + struct mpc52xx_psc __iomem *psc; + struct mpc52xx_psc_fifo __iomem *fifo; + unsigned int irq; + u8 bits_per_word; + u8 busy; + + struct work_struct work; + + struct list_head queue; + spinlock_t lock; + + struct completion done; +}; + +/* controller state */ +struct mpc52xx_psc_spi_cs { + int bits_per_word; + int speed_hz; +}; + +/* set clock freq, clock ramp, bits per work + * if t is NULL then reset the values to the default values + */ +static int mpc52xx_psc_spi_transfer_setup(struct spi_device *spi, + struct spi_transfer *t) +{ + struct mpc52xx_psc_spi_cs *cs = spi->controller_state; + + cs->speed_hz = (t && t->speed_hz) + ? t->speed_hz : spi->max_speed_hz; + cs->bits_per_word = (t && t->bits_per_word) + ? t->bits_per_word : spi->bits_per_word; + cs->bits_per_word = ((cs->bits_per_word + 7) / 8) * 8; + return 0; +} + +static void mpc52xx_psc_spi_activate_cs(struct spi_device *spi) +{ + struct mpc52xx_psc_spi_cs *cs = spi->controller_state; + struct mpc52xx_psc_spi *mps = spi_master_get_devdata(spi->master); + struct mpc52xx_psc __iomem *psc = mps->psc; + u32 sicr; + u16 ccr; + + sicr = in_be32(&psc->sicr); + + /* Set clock phase and polarity */ + if (spi->mode & SPI_CPHA) + sicr |= 0x00001000; + else + sicr &= ~0x00001000; + if (spi->mode & SPI_CPOL) + sicr |= 0x00002000; + else + sicr &= ~0x00002000; + + if (spi->mode & SPI_LSB_FIRST) + sicr |= 0x10000000; + else + sicr &= ~0x10000000; + out_be32(&psc->sicr, sicr); + + /* Set clock frequency and bits per word + * Because psc->ccr is defined as 16bit register instead of 32bit + * just set the lower byte of BitClkDiv + */ + ccr = in_be16((u16 __iomem *)&psc->ccr); + ccr &= 0xFF00; + if (cs->speed_hz) + ccr |= (MCLK / cs->speed_hz - 1) & 0xFF; + else /* by default SPI Clk 1MHz */ + ccr |= (MCLK / 1000000 - 1) & 0xFF; + out_be16((u16 __iomem *)&psc->ccr, ccr); + mps->bits_per_word = cs->bits_per_word; + + if (mps->cs_control) + mps->cs_control(spi, (spi->mode & SPI_CS_HIGH) ? 1 : 0); +} + +static void mpc52xx_psc_spi_deactivate_cs(struct spi_device *spi) +{ + struct mpc52xx_psc_spi *mps = spi_master_get_devdata(spi->master); + + if (mps->cs_control) + mps->cs_control(spi, (spi->mode & SPI_CS_HIGH) ? 0 : 1); +} + +#define MPC52xx_PSC_BUFSIZE (MPC52xx_PSC_RFNUM_MASK + 1) +/* wake up when 80% fifo full */ +#define MPC52xx_PSC_RFALARM (MPC52xx_PSC_BUFSIZE * 20 / 100) + +static int mpc52xx_psc_spi_transfer_rxtx(struct spi_device *spi, + struct spi_transfer *t) +{ + struct mpc52xx_psc_spi *mps = spi_master_get_devdata(spi->master); + struct mpc52xx_psc __iomem *psc = mps->psc; + struct mpc52xx_psc_fifo __iomem *fifo = mps->fifo; + unsigned rb = 0; /* number of bytes receieved */ + unsigned sb = 0; /* number of bytes sent */ + unsigned char *rx_buf = (unsigned char *)t->rx_buf; + unsigned char *tx_buf = (unsigned char *)t->tx_buf; + unsigned rfalarm; + unsigned send_at_once = MPC52xx_PSC_BUFSIZE; + unsigned recv_at_once; + int last_block = 0; + + if (!t->tx_buf && !t->rx_buf && t->len) + return -EINVAL; + + /* enable transmiter/receiver */ + out_8(&psc->command, MPC52xx_PSC_TX_ENABLE | MPC52xx_PSC_RX_ENABLE); + while (rb < t->len) { + if (t->len - rb > MPC52xx_PSC_BUFSIZE) { + rfalarm = MPC52xx_PSC_RFALARM; + last_block = 0; + } else { + send_at_once = t->len - sb; + rfalarm = MPC52xx_PSC_BUFSIZE - (t->len - rb); + last_block = 1; + } + + dev_dbg(&spi->dev, "send %d bytes...\n", send_at_once); + for (; send_at_once; sb++, send_at_once--) { + /* set EOF flag before the last word is sent */ + if (send_at_once == 1 && last_block) + out_8(&psc->ircr2, 0x01); + + if (tx_buf) + out_8(&psc->mpc52xx_psc_buffer_8, tx_buf[sb]); + else + out_8(&psc->mpc52xx_psc_buffer_8, 0); + } + + + /* enable interrupts and wait for wake up + * if just one byte is expected the Rx FIFO genererates no + * FFULL interrupt, so activate the RxRDY interrupt + */ + out_8(&psc->command, MPC52xx_PSC_SEL_MODE_REG_1); + if (t->len - rb == 1) { + out_8(&psc->mode, 0); + } else { + out_8(&psc->mode, MPC52xx_PSC_MODE_FFULL); + out_be16(&fifo->rfalarm, rfalarm); + } + out_be16(&psc->mpc52xx_psc_imr, MPC52xx_PSC_IMR_RXRDY); + wait_for_completion(&mps->done); + recv_at_once = in_be16(&fifo->rfnum); + dev_dbg(&spi->dev, "%d bytes received\n", recv_at_once); + + send_at_once = recv_at_once; + if (rx_buf) { + for (; recv_at_once; rb++, recv_at_once--) + rx_buf[rb] = in_8(&psc->mpc52xx_psc_buffer_8); + } else { + for (; recv_at_once; rb++, recv_at_once--) + in_8(&psc->mpc52xx_psc_buffer_8); + } + } + /* disable transmiter/receiver */ + out_8(&psc->command, MPC52xx_PSC_TX_DISABLE | MPC52xx_PSC_RX_DISABLE); + + return 0; +} + +static void mpc52xx_psc_spi_work(struct work_struct *work) +{ + struct mpc52xx_psc_spi *mps = + container_of(work, struct mpc52xx_psc_spi, work); + + spin_lock_irq(&mps->lock); + mps->busy = 1; + while (!list_empty(&mps->queue)) { + struct spi_message *m; + struct spi_device *spi; + struct spi_transfer *t = NULL; + unsigned cs_change; + int status; + + m = container_of(mps->queue.next, struct spi_message, queue); + list_del_init(&m->queue); + spin_unlock_irq(&mps->lock); + + spi = m->spi; + cs_change = 1; + status = 0; + list_for_each_entry (t, &m->transfers, transfer_list) { + if (t->bits_per_word || t->speed_hz) { + status = mpc52xx_psc_spi_transfer_setup(spi, t); + if (status < 0) + break; + } + + if (cs_change) + mpc52xx_psc_spi_activate_cs(spi); + cs_change = t->cs_change; + + status = mpc52xx_psc_spi_transfer_rxtx(spi, t); + if (status) + break; + m->actual_length += t->len; + + spi_transfer_delay_exec(t); + + if (cs_change) + mpc52xx_psc_spi_deactivate_cs(spi); + } + + m->status = status; + if (m->complete) + m->complete(m->context); + + if (status || !cs_change) + mpc52xx_psc_spi_deactivate_cs(spi); + + mpc52xx_psc_spi_transfer_setup(spi, NULL); + + spin_lock_irq(&mps->lock); + } + mps->busy = 0; + spin_unlock_irq(&mps->lock); +} + +static int mpc52xx_psc_spi_setup(struct spi_device *spi) +{ + struct mpc52xx_psc_spi *mps = spi_master_get_devdata(spi->master); + struct mpc52xx_psc_spi_cs *cs = spi->controller_state; + unsigned long flags; + + if (spi->bits_per_word%8) + return -EINVAL; + + if (!cs) { + cs = kzalloc(sizeof *cs, GFP_KERNEL); + if (!cs) + return -ENOMEM; + spi->controller_state = cs; + } + + cs->bits_per_word = spi->bits_per_word; + cs->speed_hz = spi->max_speed_hz; + + spin_lock_irqsave(&mps->lock, flags); + if (!mps->busy) + mpc52xx_psc_spi_deactivate_cs(spi); + spin_unlock_irqrestore(&mps->lock, flags); + + return 0; +} + +static int mpc52xx_psc_spi_transfer(struct spi_device *spi, + struct spi_message *m) +{ + struct mpc52xx_psc_spi *mps = spi_master_get_devdata(spi->master); + unsigned long flags; + + m->actual_length = 0; + m->status = -EINPROGRESS; + + spin_lock_irqsave(&mps->lock, flags); + list_add_tail(&m->queue, &mps->queue); + schedule_work(&mps->work); + spin_unlock_irqrestore(&mps->lock, flags); + + return 0; +} + +static void mpc52xx_psc_spi_cleanup(struct spi_device *spi) +{ + kfree(spi->controller_state); +} + +static int mpc52xx_psc_spi_port_config(int psc_id, struct mpc52xx_psc_spi *mps) +{ + struct mpc52xx_psc __iomem *psc = mps->psc; + struct mpc52xx_psc_fifo __iomem *fifo = mps->fifo; + u32 mclken_div; + int ret; + + /* default sysclk is 512MHz */ + mclken_div = (mps->sysclk ? mps->sysclk : 512000000) / MCLK; + ret = mpc52xx_set_psc_clkdiv(psc_id, mclken_div); + if (ret) + return ret; + + /* Reset the PSC into a known state */ + out_8(&psc->command, MPC52xx_PSC_RST_RX); + out_8(&psc->command, MPC52xx_PSC_RST_TX); + out_8(&psc->command, MPC52xx_PSC_TX_DISABLE | MPC52xx_PSC_RX_DISABLE); + + /* Disable interrupts, interrupts are based on alarm level */ + out_be16(&psc->mpc52xx_psc_imr, 0); + out_8(&psc->command, MPC52xx_PSC_SEL_MODE_REG_1); + out_8(&fifo->rfcntl, 0); + out_8(&psc->mode, MPC52xx_PSC_MODE_FFULL); + + /* Configure 8bit codec mode as a SPI master and use EOF flags */ + /* SICR_SIM_CODEC8|SICR_GENCLK|SICR_SPI|SICR_MSTR|SICR_USEEOF */ + out_be32(&psc->sicr, 0x0180C800); + out_be16((u16 __iomem *)&psc->ccr, 0x070F); /* default SPI Clk 1MHz */ + + /* Set 2ms DTL delay */ + out_8(&psc->ctur, 0x00); + out_8(&psc->ctlr, 0x84); + + mps->bits_per_word = 8; + + return 0; +} + +static irqreturn_t mpc52xx_psc_spi_isr(int irq, void *dev_id) +{ + struct mpc52xx_psc_spi *mps = (struct mpc52xx_psc_spi *)dev_id; + struct mpc52xx_psc __iomem *psc = mps->psc; + + /* disable interrupt and wake up the work queue */ + if (in_be16(&psc->mpc52xx_psc_isr) & MPC52xx_PSC_IMR_RXRDY) { + out_be16(&psc->mpc52xx_psc_imr, 0); + complete(&mps->done); + return IRQ_HANDLED; + } + return IRQ_NONE; +} + +/* bus_num is used only for the case dev->platform_data == NULL */ +static int mpc52xx_psc_spi_do_probe(struct device *dev, u32 regaddr, + u32 size, unsigned int irq, s16 bus_num) +{ + struct fsl_spi_platform_data *pdata = dev_get_platdata(dev); + struct mpc52xx_psc_spi *mps; + struct spi_master *master; + int ret; + + master = spi_alloc_master(dev, sizeof *mps); + if (master == NULL) + return -ENOMEM; + + dev_set_drvdata(dev, master); + mps = spi_master_get_devdata(master); + + /* the spi->mode bits understood by this driver: */ + master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH | SPI_LSB_FIRST; + + mps->irq = irq; + if (pdata == NULL) { + dev_warn(dev, + "probe called without platform data, no cs_control function will be called\n"); + mps->cs_control = NULL; + mps->sysclk = 0; + master->bus_num = bus_num; + master->num_chipselect = 255; + } else { + mps->cs_control = pdata->cs_control; + mps->sysclk = pdata->sysclk; + master->bus_num = pdata->bus_num; + master->num_chipselect = pdata->max_chipselect; + } + master->setup = mpc52xx_psc_spi_setup; + master->transfer = mpc52xx_psc_spi_transfer; + master->cleanup = mpc52xx_psc_spi_cleanup; + master->dev.of_node = dev->of_node; + + mps->psc = ioremap(regaddr, size); + if (!mps->psc) { + dev_err(dev, "could not ioremap I/O port range\n"); + ret = -EFAULT; + goto free_master; + } + /* On the 5200, fifo regs are immediately ajacent to the psc regs */ + mps->fifo = ((void __iomem *)mps->psc) + sizeof(struct mpc52xx_psc); + + ret = request_irq(mps->irq, mpc52xx_psc_spi_isr, 0, "mpc52xx-psc-spi", + mps); + if (ret) + goto free_master; + + ret = mpc52xx_psc_spi_port_config(master->bus_num, mps); + if (ret < 0) { + dev_err(dev, "can't configure PSC! Is it capable of SPI?\n"); + goto free_irq; + } + + spin_lock_init(&mps->lock); + init_completion(&mps->done); + INIT_WORK(&mps->work, mpc52xx_psc_spi_work); + INIT_LIST_HEAD(&mps->queue); + + ret = spi_register_master(master); + if (ret < 0) + goto free_irq; + + return ret; + +free_irq: + free_irq(mps->irq, mps); +free_master: + if (mps->psc) + iounmap(mps->psc); + spi_master_put(master); + + return ret; +} + +static int mpc52xx_psc_spi_of_probe(struct platform_device *op) +{ + const u32 *regaddr_p; + u64 regaddr64, size64; + s16 id = -1; + + regaddr_p = of_get_address(op->dev.of_node, 0, &size64, NULL); + if (!regaddr_p) { + dev_err(&op->dev, "Invalid PSC address\n"); + return -EINVAL; + } + regaddr64 = of_translate_address(op->dev.of_node, regaddr_p); + + /* get PSC id (1..6, used by port_config) */ + if (op->dev.platform_data == NULL) { + const u32 *psc_nump; + + psc_nump = of_get_property(op->dev.of_node, "cell-index", NULL); + if (!psc_nump || *psc_nump > 5) { + dev_err(&op->dev, "Invalid cell-index property\n"); + return -EINVAL; + } + id = *psc_nump + 1; + } + + return mpc52xx_psc_spi_do_probe(&op->dev, (u32)regaddr64, (u32)size64, + irq_of_parse_and_map(op->dev.of_node, 0), id); +} + +static int mpc52xx_psc_spi_of_remove(struct platform_device *op) +{ + struct spi_master *master = spi_master_get(platform_get_drvdata(op)); + struct mpc52xx_psc_spi *mps = spi_master_get_devdata(master); + + flush_work(&mps->work); + spi_unregister_master(master); + free_irq(mps->irq, mps); + if (mps->psc) + iounmap(mps->psc); + spi_master_put(master); + + return 0; +} + +static const struct of_device_id mpc52xx_psc_spi_of_match[] = { + { .compatible = "fsl,mpc5200-psc-spi", }, + { .compatible = "mpc5200-psc-spi", }, /* old */ + {} +}; + +MODULE_DEVICE_TABLE(of, mpc52xx_psc_spi_of_match); + +static struct platform_driver mpc52xx_psc_spi_of_driver = { + .probe = mpc52xx_psc_spi_of_probe, + .remove = mpc52xx_psc_spi_of_remove, + .driver = { + .name = "mpc52xx-psc-spi", + .of_match_table = mpc52xx_psc_spi_of_match, + }, +}; +module_platform_driver(mpc52xx_psc_spi_of_driver); + +MODULE_AUTHOR("Dragos Carp"); +MODULE_DESCRIPTION("MPC52xx PSC SPI Driver"); +MODULE_LICENSE("GPL"); diff --git a/drivers/spi/spi-mpc52xx.c b/drivers/spi/spi-mpc52xx.c new file mode 100644 index 000000000..ef2f24420 --- /dev/null +++ b/drivers/spi/spi-mpc52xx.c @@ -0,0 +1,550 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * MPC52xx SPI bus driver. + * + * Copyright (C) 2008 Secret Lab Technologies Ltd. + * + * This is the driver for the MPC5200's dedicated SPI controller. + * + * Note: this driver does not support the MPC5200 PSC in SPI mode. For + * that driver see drivers/spi/mpc52xx_psc_spi.c + */ + +#include <linux/module.h> +#include <linux/errno.h> +#include <linux/of_platform.h> +#include <linux/interrupt.h> +#include <linux/delay.h> +#include <linux/spi/spi.h> +#include <linux/io.h> +#include <linux/of_gpio.h> +#include <linux/slab.h> +#include <asm/time.h> +#include <asm/mpc52xx.h> + +MODULE_AUTHOR("Grant Likely <grant.likely@secretlab.ca>"); +MODULE_DESCRIPTION("MPC52xx SPI (non-PSC) Driver"); +MODULE_LICENSE("GPL"); + +/* Register offsets */ +#define SPI_CTRL1 0x00 +#define SPI_CTRL1_SPIE (1 << 7) +#define SPI_CTRL1_SPE (1 << 6) +#define SPI_CTRL1_MSTR (1 << 4) +#define SPI_CTRL1_CPOL (1 << 3) +#define SPI_CTRL1_CPHA (1 << 2) +#define SPI_CTRL1_SSOE (1 << 1) +#define SPI_CTRL1_LSBFE (1 << 0) + +#define SPI_CTRL2 0x01 +#define SPI_BRR 0x04 + +#define SPI_STATUS 0x05 +#define SPI_STATUS_SPIF (1 << 7) +#define SPI_STATUS_WCOL (1 << 6) +#define SPI_STATUS_MODF (1 << 4) + +#define SPI_DATA 0x09 +#define SPI_PORTDATA 0x0d +#define SPI_DATADIR 0x10 + +/* FSM state return values */ +#define FSM_STOP 0 /* Nothing more for the state machine to */ + /* do. If something interesting happens */ + /* then an IRQ will be received */ +#define FSM_POLL 1 /* need to poll for completion, an IRQ is */ + /* not expected */ +#define FSM_CONTINUE 2 /* Keep iterating the state machine */ + +/* Driver internal data */ +struct mpc52xx_spi { + struct spi_master *master; + void __iomem *regs; + int irq0; /* MODF irq */ + int irq1; /* SPIF irq */ + unsigned int ipb_freq; + + /* Statistics; not used now, but will be reintroduced for debugfs */ + int msg_count; + int wcol_count; + int wcol_ticks; + u32 wcol_tx_timestamp; + int modf_count; + int byte_count; + + struct list_head queue; /* queue of pending messages */ + spinlock_t lock; + struct work_struct work; + + /* Details of current transfer (length, and buffer pointers) */ + struct spi_message *message; /* current message */ + struct spi_transfer *transfer; /* current transfer */ + int (*state)(int irq, struct mpc52xx_spi *ms, u8 status, u8 data); + int len; + int timestamp; + u8 *rx_buf; + const u8 *tx_buf; + int cs_change; + int gpio_cs_count; + unsigned int *gpio_cs; +}; + +/* + * CS control function + */ +static void mpc52xx_spi_chipsel(struct mpc52xx_spi *ms, int value) +{ + int cs; + + if (ms->gpio_cs_count > 0) { + cs = ms->message->spi->chip_select; + gpio_set_value(ms->gpio_cs[cs], value ? 0 : 1); + } else + out_8(ms->regs + SPI_PORTDATA, value ? 0 : 0x08); +} + +/* + * Start a new transfer. This is called both by the idle state + * for the first transfer in a message, and by the wait state when the + * previous transfer in a message is complete. + */ +static void mpc52xx_spi_start_transfer(struct mpc52xx_spi *ms) +{ + ms->rx_buf = ms->transfer->rx_buf; + ms->tx_buf = ms->transfer->tx_buf; + ms->len = ms->transfer->len; + + /* Activate the chip select */ + if (ms->cs_change) + mpc52xx_spi_chipsel(ms, 1); + ms->cs_change = ms->transfer->cs_change; + + /* Write out the first byte */ + ms->wcol_tx_timestamp = get_tbl(); + if (ms->tx_buf) + out_8(ms->regs + SPI_DATA, *ms->tx_buf++); + else + out_8(ms->regs + SPI_DATA, 0); +} + +/* Forward declaration of state handlers */ +static int mpc52xx_spi_fsmstate_transfer(int irq, struct mpc52xx_spi *ms, + u8 status, u8 data); +static int mpc52xx_spi_fsmstate_wait(int irq, struct mpc52xx_spi *ms, + u8 status, u8 data); + +/* + * IDLE state + * + * No transfers are in progress; if another transfer is pending then retrieve + * it and kick it off. Otherwise, stop processing the state machine + */ +static int +mpc52xx_spi_fsmstate_idle(int irq, struct mpc52xx_spi *ms, u8 status, u8 data) +{ + struct spi_device *spi; + int spr, sppr; + u8 ctrl1; + + if (status && (irq != NO_IRQ)) + dev_err(&ms->master->dev, "spurious irq, status=0x%.2x\n", + status); + + /* Check if there is another transfer waiting. */ + if (list_empty(&ms->queue)) + return FSM_STOP; + + /* get the head of the queue */ + ms->message = list_first_entry(&ms->queue, struct spi_message, queue); + list_del_init(&ms->message->queue); + + /* Setup the controller parameters */ + ctrl1 = SPI_CTRL1_SPIE | SPI_CTRL1_SPE | SPI_CTRL1_MSTR; + spi = ms->message->spi; + if (spi->mode & SPI_CPHA) + ctrl1 |= SPI_CTRL1_CPHA; + if (spi->mode & SPI_CPOL) + ctrl1 |= SPI_CTRL1_CPOL; + if (spi->mode & SPI_LSB_FIRST) + ctrl1 |= SPI_CTRL1_LSBFE; + out_8(ms->regs + SPI_CTRL1, ctrl1); + + /* Setup the controller speed */ + /* minimum divider is '2'. Also, add '1' to force rounding the + * divider up. */ + sppr = ((ms->ipb_freq / ms->message->spi->max_speed_hz) + 1) >> 1; + spr = 0; + if (sppr < 1) + sppr = 1; + while (((sppr - 1) & ~0x7) != 0) { + sppr = (sppr + 1) >> 1; /* add '1' to force rounding up */ + spr++; + } + sppr--; /* sppr quantity in register is offset by 1 */ + if (spr > 7) { + /* Don't overrun limits of SPI baudrate register */ + spr = 7; + sppr = 7; + } + out_8(ms->regs + SPI_BRR, sppr << 4 | spr); /* Set speed */ + + ms->cs_change = 1; + ms->transfer = container_of(ms->message->transfers.next, + struct spi_transfer, transfer_list); + + mpc52xx_spi_start_transfer(ms); + ms->state = mpc52xx_spi_fsmstate_transfer; + + return FSM_CONTINUE; +} + +/* + * TRANSFER state + * + * In the middle of a transfer. If the SPI core has completed processing + * a byte, then read out the received data and write out the next byte + * (unless this transfer is finished; in which case go on to the wait + * state) + */ +static int mpc52xx_spi_fsmstate_transfer(int irq, struct mpc52xx_spi *ms, + u8 status, u8 data) +{ + if (!status) + return ms->irq0 ? FSM_STOP : FSM_POLL; + + if (status & SPI_STATUS_WCOL) { + /* The SPI controller is stoopid. At slower speeds, it may + * raise the SPIF flag before the state machine is actually + * finished, which causes a collision (internal to the state + * machine only). The manual recommends inserting a delay + * between receiving the interrupt and sending the next byte, + * but it can also be worked around simply by retrying the + * transfer which is what we do here. */ + ms->wcol_count++; + ms->wcol_ticks += get_tbl() - ms->wcol_tx_timestamp; + ms->wcol_tx_timestamp = get_tbl(); + data = 0; + if (ms->tx_buf) + data = *(ms->tx_buf - 1); + out_8(ms->regs + SPI_DATA, data); /* try again */ + return FSM_CONTINUE; + } else if (status & SPI_STATUS_MODF) { + ms->modf_count++; + dev_err(&ms->master->dev, "mode fault\n"); + mpc52xx_spi_chipsel(ms, 0); + ms->message->status = -EIO; + if (ms->message->complete) + ms->message->complete(ms->message->context); + ms->state = mpc52xx_spi_fsmstate_idle; + return FSM_CONTINUE; + } + + /* Read data out of the spi device */ + ms->byte_count++; + if (ms->rx_buf) + *ms->rx_buf++ = data; + + /* Is the transfer complete? */ + ms->len--; + if (ms->len == 0) { + ms->timestamp = get_tbl(); + ms->timestamp += ms->transfer->delay_usecs * tb_ticks_per_usec; + ms->state = mpc52xx_spi_fsmstate_wait; + return FSM_CONTINUE; + } + + /* Write out the next byte */ + ms->wcol_tx_timestamp = get_tbl(); + if (ms->tx_buf) + out_8(ms->regs + SPI_DATA, *ms->tx_buf++); + else + out_8(ms->regs + SPI_DATA, 0); + + return FSM_CONTINUE; +} + +/* + * WAIT state + * + * A transfer has completed; need to wait for the delay period to complete + * before starting the next transfer + */ +static int +mpc52xx_spi_fsmstate_wait(int irq, struct mpc52xx_spi *ms, u8 status, u8 data) +{ + if (status && irq) + dev_err(&ms->master->dev, "spurious irq, status=0x%.2x\n", + status); + + if (((int)get_tbl()) - ms->timestamp < 0) + return FSM_POLL; + + ms->message->actual_length += ms->transfer->len; + + /* Check if there is another transfer in this message. If there + * aren't then deactivate CS, notify sender, and drop back to idle + * to start the next message. */ + if (ms->transfer->transfer_list.next == &ms->message->transfers) { + ms->msg_count++; + mpc52xx_spi_chipsel(ms, 0); + ms->message->status = 0; + if (ms->message->complete) + ms->message->complete(ms->message->context); + ms->state = mpc52xx_spi_fsmstate_idle; + return FSM_CONTINUE; + } + + /* There is another transfer; kick it off */ + + if (ms->cs_change) + mpc52xx_spi_chipsel(ms, 0); + + ms->transfer = container_of(ms->transfer->transfer_list.next, + struct spi_transfer, transfer_list); + mpc52xx_spi_start_transfer(ms); + ms->state = mpc52xx_spi_fsmstate_transfer; + return FSM_CONTINUE; +} + +/** + * mpc52xx_spi_fsm_process - Finite State Machine iteration function + * @irq: irq number that triggered the FSM or 0 for polling + * @ms: pointer to mpc52xx_spi driver data + */ +static void mpc52xx_spi_fsm_process(int irq, struct mpc52xx_spi *ms) +{ + int rc = FSM_CONTINUE; + u8 status, data; + + while (rc == FSM_CONTINUE) { + /* Interrupt cleared by read of STATUS followed by + * read of DATA registers */ + status = in_8(ms->regs + SPI_STATUS); + data = in_8(ms->regs + SPI_DATA); + rc = ms->state(irq, ms, status, data); + } + + if (rc == FSM_POLL) + schedule_work(&ms->work); +} + +/** + * mpc52xx_spi_irq - IRQ handler + */ +static irqreturn_t mpc52xx_spi_irq(int irq, void *_ms) +{ + struct mpc52xx_spi *ms = _ms; + spin_lock(&ms->lock); + mpc52xx_spi_fsm_process(irq, ms); + spin_unlock(&ms->lock); + return IRQ_HANDLED; +} + +/** + * mpc52xx_spi_wq - Workqueue function for polling the state machine + */ +static void mpc52xx_spi_wq(struct work_struct *work) +{ + struct mpc52xx_spi *ms = container_of(work, struct mpc52xx_spi, work); + unsigned long flags; + + spin_lock_irqsave(&ms->lock, flags); + mpc52xx_spi_fsm_process(0, ms); + spin_unlock_irqrestore(&ms->lock, flags); +} + +/* + * spi_master ops + */ + +static int mpc52xx_spi_transfer(struct spi_device *spi, struct spi_message *m) +{ + struct mpc52xx_spi *ms = spi_master_get_devdata(spi->master); + unsigned long flags; + + m->actual_length = 0; + m->status = -EINPROGRESS; + + spin_lock_irqsave(&ms->lock, flags); + list_add_tail(&m->queue, &ms->queue); + spin_unlock_irqrestore(&ms->lock, flags); + schedule_work(&ms->work); + + return 0; +} + +/* + * OF Platform Bus Binding + */ +static int mpc52xx_spi_probe(struct platform_device *op) +{ + struct spi_master *master; + struct mpc52xx_spi *ms; + void __iomem *regs; + u8 ctrl1; + int rc, i = 0; + int gpio_cs; + + /* MMIO registers */ + dev_dbg(&op->dev, "probing mpc5200 SPI device\n"); + regs = of_iomap(op->dev.of_node, 0); + if (!regs) + return -ENODEV; + + /* initialize the device */ + ctrl1 = SPI_CTRL1_SPIE | SPI_CTRL1_SPE | SPI_CTRL1_MSTR; + out_8(regs + SPI_CTRL1, ctrl1); + out_8(regs + SPI_CTRL2, 0x0); + out_8(regs + SPI_DATADIR, 0xe); /* Set output pins */ + out_8(regs + SPI_PORTDATA, 0x8); /* Deassert /SS signal */ + + /* Clear the status register and re-read it to check for a MODF + * failure. This driver cannot currently handle multiple masters + * on the SPI bus. This fault will also occur if the SPI signals + * are not connected to any pins (port_config setting) */ + in_8(regs + SPI_STATUS); + out_8(regs + SPI_CTRL1, ctrl1); + + in_8(regs + SPI_DATA); + if (in_8(regs + SPI_STATUS) & SPI_STATUS_MODF) { + dev_err(&op->dev, "mode fault; is port_config correct?\n"); + rc = -EIO; + goto err_init; + } + + dev_dbg(&op->dev, "allocating spi_master struct\n"); + master = spi_alloc_master(&op->dev, sizeof *ms); + if (!master) { + rc = -ENOMEM; + goto err_alloc; + } + + master->transfer = mpc52xx_spi_transfer; + master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_LSB_FIRST; + master->bits_per_word_mask = SPI_BPW_MASK(8); + master->dev.of_node = op->dev.of_node; + + platform_set_drvdata(op, master); + + ms = spi_master_get_devdata(master); + ms->master = master; + ms->regs = regs; + ms->irq0 = irq_of_parse_and_map(op->dev.of_node, 0); + ms->irq1 = irq_of_parse_and_map(op->dev.of_node, 1); + ms->state = mpc52xx_spi_fsmstate_idle; + ms->ipb_freq = mpc5xxx_get_bus_frequency(op->dev.of_node); + ms->gpio_cs_count = of_gpio_count(op->dev.of_node); + if (ms->gpio_cs_count > 0) { + master->num_chipselect = ms->gpio_cs_count; + ms->gpio_cs = kmalloc_array(ms->gpio_cs_count, + sizeof(*ms->gpio_cs), + GFP_KERNEL); + if (!ms->gpio_cs) { + rc = -ENOMEM; + goto err_alloc_gpio; + } + + for (i = 0; i < ms->gpio_cs_count; i++) { + gpio_cs = of_get_gpio(op->dev.of_node, i); + if (!gpio_is_valid(gpio_cs)) { + dev_err(&op->dev, + "could not parse the gpio field in oftree\n"); + rc = -ENODEV; + goto err_gpio; + } + + rc = gpio_request(gpio_cs, dev_name(&op->dev)); + if (rc) { + dev_err(&op->dev, + "can't request spi cs gpio #%d on gpio line %d\n", + i, gpio_cs); + goto err_gpio; + } + + gpio_direction_output(gpio_cs, 1); + ms->gpio_cs[i] = gpio_cs; + } + } + + spin_lock_init(&ms->lock); + INIT_LIST_HEAD(&ms->queue); + INIT_WORK(&ms->work, mpc52xx_spi_wq); + + /* Decide if interrupts can be used */ + if (ms->irq0 && ms->irq1) { + rc = request_irq(ms->irq0, mpc52xx_spi_irq, 0, + "mpc5200-spi-modf", ms); + rc |= request_irq(ms->irq1, mpc52xx_spi_irq, 0, + "mpc5200-spi-spif", ms); + if (rc) { + free_irq(ms->irq0, ms); + free_irq(ms->irq1, ms); + ms->irq0 = ms->irq1 = 0; + } + } else { + /* operate in polled mode */ + ms->irq0 = ms->irq1 = 0; + } + + if (!ms->irq0) + dev_info(&op->dev, "using polled mode\n"); + + dev_dbg(&op->dev, "registering spi_master struct\n"); + rc = spi_register_master(master); + if (rc) + goto err_register; + + dev_info(&ms->master->dev, "registered MPC5200 SPI bus\n"); + + return rc; + + err_register: + dev_err(&ms->master->dev, "initialization failed\n"); + err_gpio: + while (i-- > 0) + gpio_free(ms->gpio_cs[i]); + + kfree(ms->gpio_cs); + err_alloc_gpio: + spi_master_put(master); + err_alloc: + err_init: + iounmap(regs); + return rc; +} + +static int mpc52xx_spi_remove(struct platform_device *op) +{ + struct spi_master *master = spi_master_get(platform_get_drvdata(op)); + struct mpc52xx_spi *ms = spi_master_get_devdata(master); + int i; + + free_irq(ms->irq0, ms); + free_irq(ms->irq1, ms); + + for (i = 0; i < ms->gpio_cs_count; i++) + gpio_free(ms->gpio_cs[i]); + + kfree(ms->gpio_cs); + spi_unregister_master(master); + iounmap(ms->regs); + spi_master_put(master); + + return 0; +} + +static const struct of_device_id mpc52xx_spi_match[] = { + { .compatible = "fsl,mpc5200-spi", }, + {} +}; +MODULE_DEVICE_TABLE(of, mpc52xx_spi_match); + +static struct platform_driver mpc52xx_spi_of_driver = { + .driver = { + .name = "mpc52xx-spi", + .of_match_table = mpc52xx_spi_match, + }, + .probe = mpc52xx_spi_probe, + .remove = mpc52xx_spi_remove, +}; +module_platform_driver(mpc52xx_spi_of_driver); diff --git a/drivers/spi/spi-mt65xx.c b/drivers/spi/spi-mt65xx.c new file mode 100644 index 000000000..92a09dfb9 --- /dev/null +++ b/drivers/spi/spi-mt65xx.c @@ -0,0 +1,911 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright (c) 2015 MediaTek Inc. + * Author: Leilk Liu <leilk.liu@mediatek.com> + */ + +#include <linux/clk.h> +#include <linux/device.h> +#include <linux/err.h> +#include <linux/interrupt.h> +#include <linux/io.h> +#include <linux/ioport.h> +#include <linux/module.h> +#include <linux/of.h> +#include <linux/of_gpio.h> +#include <linux/platform_device.h> +#include <linux/platform_data/spi-mt65xx.h> +#include <linux/pm_runtime.h> +#include <linux/spi/spi.h> +#include <linux/dma-mapping.h> + +#define SPI_CFG0_REG 0x0000 +#define SPI_CFG1_REG 0x0004 +#define SPI_TX_SRC_REG 0x0008 +#define SPI_RX_DST_REG 0x000c +#define SPI_TX_DATA_REG 0x0010 +#define SPI_RX_DATA_REG 0x0014 +#define SPI_CMD_REG 0x0018 +#define SPI_STATUS0_REG 0x001c +#define SPI_PAD_SEL_REG 0x0024 +#define SPI_CFG2_REG 0x0028 +#define SPI_TX_SRC_REG_64 0x002c +#define SPI_RX_DST_REG_64 0x0030 + +#define SPI_CFG0_SCK_HIGH_OFFSET 0 +#define SPI_CFG0_SCK_LOW_OFFSET 8 +#define SPI_CFG0_CS_HOLD_OFFSET 16 +#define SPI_CFG0_CS_SETUP_OFFSET 24 +#define SPI_ADJUST_CFG0_CS_HOLD_OFFSET 0 +#define SPI_ADJUST_CFG0_CS_SETUP_OFFSET 16 + +#define SPI_CFG1_CS_IDLE_OFFSET 0 +#define SPI_CFG1_PACKET_LOOP_OFFSET 8 +#define SPI_CFG1_PACKET_LENGTH_OFFSET 16 +#define SPI_CFG1_GET_TICK_DLY_OFFSET 30 + +#define SPI_CFG1_CS_IDLE_MASK 0xff +#define SPI_CFG1_PACKET_LOOP_MASK 0xff00 +#define SPI_CFG1_PACKET_LENGTH_MASK 0x3ff0000 +#define SPI_CFG2_SCK_HIGH_OFFSET 0 +#define SPI_CFG2_SCK_LOW_OFFSET 16 + +#define SPI_CMD_ACT BIT(0) +#define SPI_CMD_RESUME BIT(1) +#define SPI_CMD_RST BIT(2) +#define SPI_CMD_PAUSE_EN BIT(4) +#define SPI_CMD_DEASSERT BIT(5) +#define SPI_CMD_SAMPLE_SEL BIT(6) +#define SPI_CMD_CS_POL BIT(7) +#define SPI_CMD_CPHA BIT(8) +#define SPI_CMD_CPOL BIT(9) +#define SPI_CMD_RX_DMA BIT(10) +#define SPI_CMD_TX_DMA BIT(11) +#define SPI_CMD_TXMSBF BIT(12) +#define SPI_CMD_RXMSBF BIT(13) +#define SPI_CMD_RX_ENDIAN BIT(14) +#define SPI_CMD_TX_ENDIAN BIT(15) +#define SPI_CMD_FINISH_IE BIT(16) +#define SPI_CMD_PAUSE_IE BIT(17) + +#define MT8173_SPI_MAX_PAD_SEL 3 + +#define MTK_SPI_PAUSE_INT_STATUS 0x2 + +#define MTK_SPI_IDLE 0 +#define MTK_SPI_PAUSED 1 + +#define MTK_SPI_MAX_FIFO_SIZE 32U +#define MTK_SPI_PACKET_SIZE 1024 +#define MTK_SPI_32BITS_MASK (0xffffffff) + +#define DMA_ADDR_EXT_BITS (36) +#define DMA_ADDR_DEF_BITS (32) + +struct mtk_spi_compatible { + bool need_pad_sel; + /* Must explicitly send dummy Tx bytes to do Rx only transfer */ + bool must_tx; + /* some IC design adjust cfg register to enhance time accuracy */ + bool enhance_timing; + /* some IC support DMA addr extension */ + bool dma_ext; +}; + +struct mtk_spi { + void __iomem *base; + u32 state; + int pad_num; + u32 *pad_sel; + struct clk *parent_clk, *sel_clk, *spi_clk; + struct spi_transfer *cur_transfer; + u32 xfer_len; + u32 num_xfered; + struct scatterlist *tx_sgl, *rx_sgl; + u32 tx_sgl_len, rx_sgl_len; + const struct mtk_spi_compatible *dev_comp; +}; + +static const struct mtk_spi_compatible mtk_common_compat; + +static const struct mtk_spi_compatible mt2712_compat = { + .must_tx = true, +}; + +static const struct mtk_spi_compatible mt6765_compat = { + .need_pad_sel = true, + .must_tx = true, + .enhance_timing = true, + .dma_ext = true, +}; + +static const struct mtk_spi_compatible mt7622_compat = { + .must_tx = true, + .enhance_timing = true, +}; + +static const struct mtk_spi_compatible mt8173_compat = { + .need_pad_sel = true, + .must_tx = true, +}; + +static const struct mtk_spi_compatible mt8183_compat = { + .need_pad_sel = true, + .must_tx = true, + .enhance_timing = true, +}; + +/* + * A piece of default chip info unless the platform + * supplies it. + */ +static const struct mtk_chip_config mtk_default_chip_info = { + .sample_sel = 0, +}; + +static const struct of_device_id mtk_spi_of_match[] = { + { .compatible = "mediatek,mt2701-spi", + .data = (void *)&mtk_common_compat, + }, + { .compatible = "mediatek,mt2712-spi", + .data = (void *)&mt2712_compat, + }, + { .compatible = "mediatek,mt6589-spi", + .data = (void *)&mtk_common_compat, + }, + { .compatible = "mediatek,mt6765-spi", + .data = (void *)&mt6765_compat, + }, + { .compatible = "mediatek,mt7622-spi", + .data = (void *)&mt7622_compat, + }, + { .compatible = "mediatek,mt7629-spi", + .data = (void *)&mt7622_compat, + }, + { .compatible = "mediatek,mt8135-spi", + .data = (void *)&mtk_common_compat, + }, + { .compatible = "mediatek,mt8173-spi", + .data = (void *)&mt8173_compat, + }, + { .compatible = "mediatek,mt8183-spi", + .data = (void *)&mt8183_compat, + }, + { .compatible = "mediatek,mt8192-spi", + .data = (void *)&mt6765_compat, + }, + {} +}; +MODULE_DEVICE_TABLE(of, mtk_spi_of_match); + +static void mtk_spi_reset(struct mtk_spi *mdata) +{ + u32 reg_val; + + /* set the software reset bit in SPI_CMD_REG. */ + reg_val = readl(mdata->base + SPI_CMD_REG); + reg_val |= SPI_CMD_RST; + writel(reg_val, mdata->base + SPI_CMD_REG); + + reg_val = readl(mdata->base + SPI_CMD_REG); + reg_val &= ~SPI_CMD_RST; + writel(reg_val, mdata->base + SPI_CMD_REG); +} + +static int mtk_spi_prepare_message(struct spi_master *master, + struct spi_message *msg) +{ + u16 cpha, cpol; + u32 reg_val; + struct spi_device *spi = msg->spi; + struct mtk_chip_config *chip_config = spi->controller_data; + struct mtk_spi *mdata = spi_master_get_devdata(master); + + cpha = spi->mode & SPI_CPHA ? 1 : 0; + cpol = spi->mode & SPI_CPOL ? 1 : 0; + + reg_val = readl(mdata->base + SPI_CMD_REG); + if (cpha) + reg_val |= SPI_CMD_CPHA; + else + reg_val &= ~SPI_CMD_CPHA; + if (cpol) + reg_val |= SPI_CMD_CPOL; + else + reg_val &= ~SPI_CMD_CPOL; + + /* set the mlsbx and mlsbtx */ + if (spi->mode & SPI_LSB_FIRST) { + reg_val &= ~SPI_CMD_TXMSBF; + reg_val &= ~SPI_CMD_RXMSBF; + } else { + reg_val |= SPI_CMD_TXMSBF; + reg_val |= SPI_CMD_RXMSBF; + } + + /* set the tx/rx endian */ +#ifdef __LITTLE_ENDIAN + reg_val &= ~SPI_CMD_TX_ENDIAN; + reg_val &= ~SPI_CMD_RX_ENDIAN; +#else + reg_val |= SPI_CMD_TX_ENDIAN; + reg_val |= SPI_CMD_RX_ENDIAN; +#endif + + if (mdata->dev_comp->enhance_timing) { + /* set CS polarity */ + if (spi->mode & SPI_CS_HIGH) + reg_val |= SPI_CMD_CS_POL; + else + reg_val &= ~SPI_CMD_CS_POL; + + if (chip_config->sample_sel) + reg_val |= SPI_CMD_SAMPLE_SEL; + else + reg_val &= ~SPI_CMD_SAMPLE_SEL; + } + + /* set finish and pause interrupt always enable */ + reg_val |= SPI_CMD_FINISH_IE | SPI_CMD_PAUSE_IE; + + /* disable dma mode */ + reg_val &= ~(SPI_CMD_TX_DMA | SPI_CMD_RX_DMA); + + /* disable deassert mode */ + reg_val &= ~SPI_CMD_DEASSERT; + + writel(reg_val, mdata->base + SPI_CMD_REG); + + /* pad select */ + if (mdata->dev_comp->need_pad_sel) + writel(mdata->pad_sel[spi->chip_select], + mdata->base + SPI_PAD_SEL_REG); + + return 0; +} + +static void mtk_spi_set_cs(struct spi_device *spi, bool enable) +{ + u32 reg_val; + struct mtk_spi *mdata = spi_master_get_devdata(spi->master); + + if (spi->mode & SPI_CS_HIGH) + enable = !enable; + + reg_val = readl(mdata->base + SPI_CMD_REG); + if (!enable) { + reg_val |= SPI_CMD_PAUSE_EN; + writel(reg_val, mdata->base + SPI_CMD_REG); + } else { + reg_val &= ~SPI_CMD_PAUSE_EN; + writel(reg_val, mdata->base + SPI_CMD_REG); + mdata->state = MTK_SPI_IDLE; + mtk_spi_reset(mdata); + } +} + +static void mtk_spi_prepare_transfer(struct spi_master *master, + struct spi_transfer *xfer) +{ + u32 spi_clk_hz, div, sck_time, cs_time, reg_val; + struct mtk_spi *mdata = spi_master_get_devdata(master); + + spi_clk_hz = clk_get_rate(mdata->spi_clk); + if (xfer->speed_hz < spi_clk_hz / 2) + div = DIV_ROUND_UP(spi_clk_hz, xfer->speed_hz); + else + div = 1; + + sck_time = (div + 1) / 2; + cs_time = sck_time * 2; + + if (mdata->dev_comp->enhance_timing) { + reg_val = (((sck_time - 1) & 0xffff) + << SPI_CFG2_SCK_HIGH_OFFSET); + reg_val |= (((sck_time - 1) & 0xffff) + << SPI_CFG2_SCK_LOW_OFFSET); + writel(reg_val, mdata->base + SPI_CFG2_REG); + reg_val = (((cs_time - 1) & 0xffff) + << SPI_ADJUST_CFG0_CS_HOLD_OFFSET); + reg_val |= (((cs_time - 1) & 0xffff) + << SPI_ADJUST_CFG0_CS_SETUP_OFFSET); + writel(reg_val, mdata->base + SPI_CFG0_REG); + } else { + reg_val = (((sck_time - 1) & 0xff) + << SPI_CFG0_SCK_HIGH_OFFSET); + reg_val |= (((sck_time - 1) & 0xff) << SPI_CFG0_SCK_LOW_OFFSET); + reg_val |= (((cs_time - 1) & 0xff) << SPI_CFG0_CS_HOLD_OFFSET); + reg_val |= (((cs_time - 1) & 0xff) << SPI_CFG0_CS_SETUP_OFFSET); + writel(reg_val, mdata->base + SPI_CFG0_REG); + } + + reg_val = readl(mdata->base + SPI_CFG1_REG); + reg_val &= ~SPI_CFG1_CS_IDLE_MASK; + reg_val |= (((cs_time - 1) & 0xff) << SPI_CFG1_CS_IDLE_OFFSET); + writel(reg_val, mdata->base + SPI_CFG1_REG); +} + +static void mtk_spi_setup_packet(struct spi_master *master) +{ + u32 packet_size, packet_loop, reg_val; + struct mtk_spi *mdata = spi_master_get_devdata(master); + + packet_size = min_t(u32, mdata->xfer_len, MTK_SPI_PACKET_SIZE); + packet_loop = mdata->xfer_len / packet_size; + + reg_val = readl(mdata->base + SPI_CFG1_REG); + reg_val &= ~(SPI_CFG1_PACKET_LENGTH_MASK | SPI_CFG1_PACKET_LOOP_MASK); + reg_val |= (packet_size - 1) << SPI_CFG1_PACKET_LENGTH_OFFSET; + reg_val |= (packet_loop - 1) << SPI_CFG1_PACKET_LOOP_OFFSET; + writel(reg_val, mdata->base + SPI_CFG1_REG); +} + +static void mtk_spi_enable_transfer(struct spi_master *master) +{ + u32 cmd; + struct mtk_spi *mdata = spi_master_get_devdata(master); + + cmd = readl(mdata->base + SPI_CMD_REG); + if (mdata->state == MTK_SPI_IDLE) + cmd |= SPI_CMD_ACT; + else + cmd |= SPI_CMD_RESUME; + writel(cmd, mdata->base + SPI_CMD_REG); +} + +static int mtk_spi_get_mult_delta(u32 xfer_len) +{ + u32 mult_delta; + + if (xfer_len > MTK_SPI_PACKET_SIZE) + mult_delta = xfer_len % MTK_SPI_PACKET_SIZE; + else + mult_delta = 0; + + return mult_delta; +} + +static void mtk_spi_update_mdata_len(struct spi_master *master) +{ + int mult_delta; + struct mtk_spi *mdata = spi_master_get_devdata(master); + + if (mdata->tx_sgl_len && mdata->rx_sgl_len) { + if (mdata->tx_sgl_len > mdata->rx_sgl_len) { + mult_delta = mtk_spi_get_mult_delta(mdata->rx_sgl_len); + mdata->xfer_len = mdata->rx_sgl_len - mult_delta; + mdata->rx_sgl_len = mult_delta; + mdata->tx_sgl_len -= mdata->xfer_len; + } else { + mult_delta = mtk_spi_get_mult_delta(mdata->tx_sgl_len); + mdata->xfer_len = mdata->tx_sgl_len - mult_delta; + mdata->tx_sgl_len = mult_delta; + mdata->rx_sgl_len -= mdata->xfer_len; + } + } else if (mdata->tx_sgl_len) { + mult_delta = mtk_spi_get_mult_delta(mdata->tx_sgl_len); + mdata->xfer_len = mdata->tx_sgl_len - mult_delta; + mdata->tx_sgl_len = mult_delta; + } else if (mdata->rx_sgl_len) { + mult_delta = mtk_spi_get_mult_delta(mdata->rx_sgl_len); + mdata->xfer_len = mdata->rx_sgl_len - mult_delta; + mdata->rx_sgl_len = mult_delta; + } +} + +static void mtk_spi_setup_dma_addr(struct spi_master *master, + struct spi_transfer *xfer) +{ + struct mtk_spi *mdata = spi_master_get_devdata(master); + + if (mdata->tx_sgl) { + writel((u32)(xfer->tx_dma & MTK_SPI_32BITS_MASK), + mdata->base + SPI_TX_SRC_REG); +#ifdef CONFIG_ARCH_DMA_ADDR_T_64BIT + if (mdata->dev_comp->dma_ext) + writel((u32)(xfer->tx_dma >> 32), + mdata->base + SPI_TX_SRC_REG_64); +#endif + } + + if (mdata->rx_sgl) { + writel((u32)(xfer->rx_dma & MTK_SPI_32BITS_MASK), + mdata->base + SPI_RX_DST_REG); +#ifdef CONFIG_ARCH_DMA_ADDR_T_64BIT + if (mdata->dev_comp->dma_ext) + writel((u32)(xfer->rx_dma >> 32), + mdata->base + SPI_RX_DST_REG_64); +#endif + } +} + +static int mtk_spi_fifo_transfer(struct spi_master *master, + struct spi_device *spi, + struct spi_transfer *xfer) +{ + int cnt, remainder; + u32 reg_val; + struct mtk_spi *mdata = spi_master_get_devdata(master); + + mdata->cur_transfer = xfer; + mdata->xfer_len = min(MTK_SPI_MAX_FIFO_SIZE, xfer->len); + mdata->num_xfered = 0; + mtk_spi_prepare_transfer(master, xfer); + mtk_spi_setup_packet(master); + + if (xfer->tx_buf) { + cnt = xfer->len / 4; + iowrite32_rep(mdata->base + SPI_TX_DATA_REG, xfer->tx_buf, cnt); + remainder = xfer->len % 4; + if (remainder > 0) { + reg_val = 0; + memcpy(®_val, xfer->tx_buf + (cnt * 4), remainder); + writel(reg_val, mdata->base + SPI_TX_DATA_REG); + } + } + + mtk_spi_enable_transfer(master); + + return 1; +} + +static int mtk_spi_dma_transfer(struct spi_master *master, + struct spi_device *spi, + struct spi_transfer *xfer) +{ + int cmd; + struct mtk_spi *mdata = spi_master_get_devdata(master); + + mdata->tx_sgl = NULL; + mdata->rx_sgl = NULL; + mdata->tx_sgl_len = 0; + mdata->rx_sgl_len = 0; + mdata->cur_transfer = xfer; + mdata->num_xfered = 0; + + mtk_spi_prepare_transfer(master, xfer); + + cmd = readl(mdata->base + SPI_CMD_REG); + if (xfer->tx_buf) + cmd |= SPI_CMD_TX_DMA; + if (xfer->rx_buf) + cmd |= SPI_CMD_RX_DMA; + writel(cmd, mdata->base + SPI_CMD_REG); + + if (xfer->tx_buf) + mdata->tx_sgl = xfer->tx_sg.sgl; + if (xfer->rx_buf) + mdata->rx_sgl = xfer->rx_sg.sgl; + + if (mdata->tx_sgl) { + xfer->tx_dma = sg_dma_address(mdata->tx_sgl); + mdata->tx_sgl_len = sg_dma_len(mdata->tx_sgl); + } + if (mdata->rx_sgl) { + xfer->rx_dma = sg_dma_address(mdata->rx_sgl); + mdata->rx_sgl_len = sg_dma_len(mdata->rx_sgl); + } + + mtk_spi_update_mdata_len(master); + mtk_spi_setup_packet(master); + mtk_spi_setup_dma_addr(master, xfer); + mtk_spi_enable_transfer(master); + + return 1; +} + +static int mtk_spi_transfer_one(struct spi_master *master, + struct spi_device *spi, + struct spi_transfer *xfer) +{ + if (master->can_dma(master, spi, xfer)) + return mtk_spi_dma_transfer(master, spi, xfer); + else + return mtk_spi_fifo_transfer(master, spi, xfer); +} + +static bool mtk_spi_can_dma(struct spi_master *master, + struct spi_device *spi, + struct spi_transfer *xfer) +{ + /* Buffers for DMA transactions must be 4-byte aligned */ + return (xfer->len > MTK_SPI_MAX_FIFO_SIZE && + (unsigned long)xfer->tx_buf % 4 == 0 && + (unsigned long)xfer->rx_buf % 4 == 0); +} + +static int mtk_spi_setup(struct spi_device *spi) +{ + struct mtk_spi *mdata = spi_master_get_devdata(spi->master); + + if (!spi->controller_data) + spi->controller_data = (void *)&mtk_default_chip_info; + + if (mdata->dev_comp->need_pad_sel && gpio_is_valid(spi->cs_gpio)) + gpio_direction_output(spi->cs_gpio, !(spi->mode & SPI_CS_HIGH)); + + return 0; +} + +static irqreturn_t mtk_spi_interrupt(int irq, void *dev_id) +{ + u32 cmd, reg_val, cnt, remainder, len; + struct spi_master *master = dev_id; + struct mtk_spi *mdata = spi_master_get_devdata(master); + struct spi_transfer *trans = mdata->cur_transfer; + + reg_val = readl(mdata->base + SPI_STATUS0_REG); + if (reg_val & MTK_SPI_PAUSE_INT_STATUS) + mdata->state = MTK_SPI_PAUSED; + else + mdata->state = MTK_SPI_IDLE; + + if (!master->can_dma(master, NULL, trans)) { + if (trans->rx_buf) { + cnt = mdata->xfer_len / 4; + ioread32_rep(mdata->base + SPI_RX_DATA_REG, + trans->rx_buf + mdata->num_xfered, cnt); + remainder = mdata->xfer_len % 4; + if (remainder > 0) { + reg_val = readl(mdata->base + SPI_RX_DATA_REG); + memcpy(trans->rx_buf + + mdata->num_xfered + + (cnt * 4), + ®_val, + remainder); + } + } + + mdata->num_xfered += mdata->xfer_len; + if (mdata->num_xfered == trans->len) { + spi_finalize_current_transfer(master); + return IRQ_HANDLED; + } + + len = trans->len - mdata->num_xfered; + mdata->xfer_len = min(MTK_SPI_MAX_FIFO_SIZE, len); + mtk_spi_setup_packet(master); + + cnt = mdata->xfer_len / 4; + iowrite32_rep(mdata->base + SPI_TX_DATA_REG, + trans->tx_buf + mdata->num_xfered, cnt); + + remainder = mdata->xfer_len % 4; + if (remainder > 0) { + reg_val = 0; + memcpy(®_val, + trans->tx_buf + (cnt * 4) + mdata->num_xfered, + remainder); + writel(reg_val, mdata->base + SPI_TX_DATA_REG); + } + + mtk_spi_enable_transfer(master); + + return IRQ_HANDLED; + } + + if (mdata->tx_sgl) + trans->tx_dma += mdata->xfer_len; + if (mdata->rx_sgl) + trans->rx_dma += mdata->xfer_len; + + if (mdata->tx_sgl && (mdata->tx_sgl_len == 0)) { + mdata->tx_sgl = sg_next(mdata->tx_sgl); + if (mdata->tx_sgl) { + trans->tx_dma = sg_dma_address(mdata->tx_sgl); + mdata->tx_sgl_len = sg_dma_len(mdata->tx_sgl); + } + } + if (mdata->rx_sgl && (mdata->rx_sgl_len == 0)) { + mdata->rx_sgl = sg_next(mdata->rx_sgl); + if (mdata->rx_sgl) { + trans->rx_dma = sg_dma_address(mdata->rx_sgl); + mdata->rx_sgl_len = sg_dma_len(mdata->rx_sgl); + } + } + + if (!mdata->tx_sgl && !mdata->rx_sgl) { + /* spi disable dma */ + cmd = readl(mdata->base + SPI_CMD_REG); + cmd &= ~SPI_CMD_TX_DMA; + cmd &= ~SPI_CMD_RX_DMA; + writel(cmd, mdata->base + SPI_CMD_REG); + + spi_finalize_current_transfer(master); + return IRQ_HANDLED; + } + + mtk_spi_update_mdata_len(master); + mtk_spi_setup_packet(master); + mtk_spi_setup_dma_addr(master, trans); + mtk_spi_enable_transfer(master); + + return IRQ_HANDLED; +} + +static int mtk_spi_probe(struct platform_device *pdev) +{ + struct spi_master *master; + struct mtk_spi *mdata; + const struct of_device_id *of_id; + int i, irq, ret, addr_bits; + + master = spi_alloc_master(&pdev->dev, sizeof(*mdata)); + if (!master) { + dev_err(&pdev->dev, "failed to alloc spi master\n"); + return -ENOMEM; + } + + master->auto_runtime_pm = true; + master->dev.of_node = pdev->dev.of_node; + master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_LSB_FIRST; + + master->set_cs = mtk_spi_set_cs; + master->prepare_message = mtk_spi_prepare_message; + master->transfer_one = mtk_spi_transfer_one; + master->can_dma = mtk_spi_can_dma; + master->setup = mtk_spi_setup; + + of_id = of_match_node(mtk_spi_of_match, pdev->dev.of_node); + if (!of_id) { + dev_err(&pdev->dev, "failed to probe of_node\n"); + ret = -EINVAL; + goto err_put_master; + } + + mdata = spi_master_get_devdata(master); + mdata->dev_comp = of_id->data; + + if (mdata->dev_comp->enhance_timing) + master->mode_bits |= SPI_CS_HIGH; + + if (mdata->dev_comp->must_tx) + master->flags = SPI_MASTER_MUST_TX; + + if (mdata->dev_comp->need_pad_sel) { + mdata->pad_num = of_property_count_u32_elems( + pdev->dev.of_node, + "mediatek,pad-select"); + if (mdata->pad_num < 0) { + dev_err(&pdev->dev, + "No 'mediatek,pad-select' property\n"); + ret = -EINVAL; + goto err_put_master; + } + + mdata->pad_sel = devm_kmalloc_array(&pdev->dev, mdata->pad_num, + sizeof(u32), GFP_KERNEL); + if (!mdata->pad_sel) { + ret = -ENOMEM; + goto err_put_master; + } + + for (i = 0; i < mdata->pad_num; i++) { + of_property_read_u32_index(pdev->dev.of_node, + "mediatek,pad-select", + i, &mdata->pad_sel[i]); + if (mdata->pad_sel[i] > MT8173_SPI_MAX_PAD_SEL) { + dev_err(&pdev->dev, "wrong pad-sel[%d]: %u\n", + i, mdata->pad_sel[i]); + ret = -EINVAL; + goto err_put_master; + } + } + } + + platform_set_drvdata(pdev, master); + mdata->base = devm_platform_ioremap_resource(pdev, 0); + if (IS_ERR(mdata->base)) { + ret = PTR_ERR(mdata->base); + goto err_put_master; + } + + irq = platform_get_irq(pdev, 0); + if (irq < 0) { + ret = irq; + goto err_put_master; + } + + if (!pdev->dev.dma_mask) + pdev->dev.dma_mask = &pdev->dev.coherent_dma_mask; + + ret = devm_request_irq(&pdev->dev, irq, mtk_spi_interrupt, + IRQF_TRIGGER_NONE, dev_name(&pdev->dev), master); + if (ret) { + dev_err(&pdev->dev, "failed to register irq (%d)\n", ret); + goto err_put_master; + } + + mdata->parent_clk = devm_clk_get(&pdev->dev, "parent-clk"); + if (IS_ERR(mdata->parent_clk)) { + ret = PTR_ERR(mdata->parent_clk); + dev_err(&pdev->dev, "failed to get parent-clk: %d\n", ret); + goto err_put_master; + } + + mdata->sel_clk = devm_clk_get(&pdev->dev, "sel-clk"); + if (IS_ERR(mdata->sel_clk)) { + ret = PTR_ERR(mdata->sel_clk); + dev_err(&pdev->dev, "failed to get sel-clk: %d\n", ret); + goto err_put_master; + } + + mdata->spi_clk = devm_clk_get(&pdev->dev, "spi-clk"); + if (IS_ERR(mdata->spi_clk)) { + ret = PTR_ERR(mdata->spi_clk); + dev_err(&pdev->dev, "failed to get spi-clk: %d\n", ret); + goto err_put_master; + } + + ret = clk_prepare_enable(mdata->spi_clk); + if (ret < 0) { + dev_err(&pdev->dev, "failed to enable spi_clk (%d)\n", ret); + goto err_put_master; + } + + ret = clk_set_parent(mdata->sel_clk, mdata->parent_clk); + if (ret < 0) { + dev_err(&pdev->dev, "failed to clk_set_parent (%d)\n", ret); + clk_disable_unprepare(mdata->spi_clk); + goto err_put_master; + } + + clk_disable_unprepare(mdata->spi_clk); + + pm_runtime_enable(&pdev->dev); + + ret = devm_spi_register_master(&pdev->dev, master); + if (ret) { + dev_err(&pdev->dev, "failed to register master (%d)\n", ret); + goto err_disable_runtime_pm; + } + + if (mdata->dev_comp->need_pad_sel) { + if (mdata->pad_num != master->num_chipselect) { + dev_err(&pdev->dev, + "pad_num does not match num_chipselect(%d != %d)\n", + mdata->pad_num, master->num_chipselect); + ret = -EINVAL; + goto err_disable_runtime_pm; + } + + if (!master->cs_gpios && master->num_chipselect > 1) { + dev_err(&pdev->dev, + "cs_gpios not specified and num_chipselect > 1\n"); + ret = -EINVAL; + goto err_disable_runtime_pm; + } + + if (master->cs_gpios) { + for (i = 0; i < master->num_chipselect; i++) { + ret = devm_gpio_request(&pdev->dev, + master->cs_gpios[i], + dev_name(&pdev->dev)); + if (ret) { + dev_err(&pdev->dev, + "can't get CS GPIO %i\n", i); + goto err_disable_runtime_pm; + } + } + } + } + + if (mdata->dev_comp->dma_ext) + addr_bits = DMA_ADDR_EXT_BITS; + else + addr_bits = DMA_ADDR_DEF_BITS; + ret = dma_set_mask(&pdev->dev, DMA_BIT_MASK(addr_bits)); + if (ret) + dev_notice(&pdev->dev, "SPI dma_set_mask(%d) failed, ret:%d\n", + addr_bits, ret); + + return 0; + +err_disable_runtime_pm: + pm_runtime_disable(&pdev->dev); +err_put_master: + spi_master_put(master); + + return ret; +} + +static int mtk_spi_remove(struct platform_device *pdev) +{ + struct spi_master *master = platform_get_drvdata(pdev); + struct mtk_spi *mdata = spi_master_get_devdata(master); + + pm_runtime_disable(&pdev->dev); + + mtk_spi_reset(mdata); + + return 0; +} + +#ifdef CONFIG_PM_SLEEP +static int mtk_spi_suspend(struct device *dev) +{ + int ret; + struct spi_master *master = dev_get_drvdata(dev); + struct mtk_spi *mdata = spi_master_get_devdata(master); + + ret = spi_master_suspend(master); + if (ret) + return ret; + + if (!pm_runtime_suspended(dev)) + clk_disable_unprepare(mdata->spi_clk); + + return ret; +} + +static int mtk_spi_resume(struct device *dev) +{ + int ret; + struct spi_master *master = dev_get_drvdata(dev); + struct mtk_spi *mdata = spi_master_get_devdata(master); + + if (!pm_runtime_suspended(dev)) { + ret = clk_prepare_enable(mdata->spi_clk); + if (ret < 0) { + dev_err(dev, "failed to enable spi_clk (%d)\n", ret); + return ret; + } + } + + ret = spi_master_resume(master); + if (ret < 0) + clk_disable_unprepare(mdata->spi_clk); + + return ret; +} +#endif /* CONFIG_PM_SLEEP */ + +#ifdef CONFIG_PM +static int mtk_spi_runtime_suspend(struct device *dev) +{ + struct spi_master *master = dev_get_drvdata(dev); + struct mtk_spi *mdata = spi_master_get_devdata(master); + + clk_disable_unprepare(mdata->spi_clk); + + return 0; +} + +static int mtk_spi_runtime_resume(struct device *dev) +{ + struct spi_master *master = dev_get_drvdata(dev); + struct mtk_spi *mdata = spi_master_get_devdata(master); + int ret; + + ret = clk_prepare_enable(mdata->spi_clk); + if (ret < 0) { + dev_err(dev, "failed to enable spi_clk (%d)\n", ret); + return ret; + } + + return 0; +} +#endif /* CONFIG_PM */ + +static const struct dev_pm_ops mtk_spi_pm = { + SET_SYSTEM_SLEEP_PM_OPS(mtk_spi_suspend, mtk_spi_resume) + SET_RUNTIME_PM_OPS(mtk_spi_runtime_suspend, + mtk_spi_runtime_resume, NULL) +}; + +static struct platform_driver mtk_spi_driver = { + .driver = { + .name = "mtk-spi", + .pm = &mtk_spi_pm, + .of_match_table = mtk_spi_of_match, + }, + .probe = mtk_spi_probe, + .remove = mtk_spi_remove, +}; + +module_platform_driver(mtk_spi_driver); + +MODULE_DESCRIPTION("MTK SPI Controller driver"); +MODULE_AUTHOR("Leilk Liu <leilk.liu@mediatek.com>"); +MODULE_LICENSE("GPL v2"); +MODULE_ALIAS("platform:mtk-spi"); diff --git a/drivers/spi/spi-mt7621.c b/drivers/spi/spi-mt7621.c new file mode 100644 index 000000000..351b0ef52 --- /dev/null +++ b/drivers/spi/spi-mt7621.c @@ -0,0 +1,419 @@ +// SPDX-License-Identifier: GPL-2.0 +// +// spi-mt7621.c -- MediaTek MT7621 SPI controller driver +// +// Copyright (C) 2011 Sergiy <piratfm@gmail.com> +// Copyright (C) 2011-2013 Gabor Juhos <juhosg@openwrt.org> +// Copyright (C) 2014-2015 Felix Fietkau <nbd@nbd.name> +// +// Some parts are based on spi-orion.c: +// Author: Shadi Ammouri <shadi@marvell.com> +// Copyright (C) 2007-2008 Marvell Ltd. + +#include <linux/clk.h> +#include <linux/delay.h> +#include <linux/io.h> +#include <linux/module.h> +#include <linux/of_device.h> +#include <linux/reset.h> +#include <linux/spi/spi.h> + +#define DRIVER_NAME "spi-mt7621" + +/* in usec */ +#define RALINK_SPI_WAIT_MAX_LOOP 2000 + +/* SPISTAT register bit field */ +#define SPISTAT_BUSY BIT(0) + +#define MT7621_SPI_TRANS 0x00 +#define SPITRANS_BUSY BIT(16) + +#define MT7621_SPI_OPCODE 0x04 +#define MT7621_SPI_DATA0 0x08 +#define MT7621_SPI_DATA4 0x18 +#define SPI_CTL_TX_RX_CNT_MASK 0xff +#define SPI_CTL_START BIT(8) + +#define MT7621_SPI_MASTER 0x28 +#define MASTER_MORE_BUFMODE BIT(2) +#define MASTER_FULL_DUPLEX BIT(10) +#define MASTER_RS_CLK_SEL GENMASK(27, 16) +#define MASTER_RS_CLK_SEL_SHIFT 16 +#define MASTER_RS_SLAVE_SEL GENMASK(31, 29) + +#define MT7621_SPI_MOREBUF 0x2c +#define MT7621_SPI_POLAR 0x38 +#define MT7621_SPI_SPACE 0x3c + +#define MT7621_CPHA BIT(5) +#define MT7621_CPOL BIT(4) +#define MT7621_LSB_FIRST BIT(3) + +struct mt7621_spi { + struct spi_controller *master; + void __iomem *base; + unsigned int sys_freq; + unsigned int speed; + struct clk *clk; + int pending_write; +}; + +static inline struct mt7621_spi *spidev_to_mt7621_spi(struct spi_device *spi) +{ + return spi_controller_get_devdata(spi->master); +} + +static inline u32 mt7621_spi_read(struct mt7621_spi *rs, u32 reg) +{ + return ioread32(rs->base + reg); +} + +static inline void mt7621_spi_write(struct mt7621_spi *rs, u32 reg, u32 val) +{ + iowrite32(val, rs->base + reg); +} + +static void mt7621_spi_set_cs(struct spi_device *spi, int enable) +{ + struct mt7621_spi *rs = spidev_to_mt7621_spi(spi); + int cs = spi->chip_select; + u32 polar = 0; + u32 master; + + /* + * Select SPI device 7, enable "more buffer mode" and disable + * full-duplex (only half-duplex really works on this chip + * reliably) + */ + master = mt7621_spi_read(rs, MT7621_SPI_MASTER); + master |= MASTER_RS_SLAVE_SEL | MASTER_MORE_BUFMODE; + master &= ~MASTER_FULL_DUPLEX; + mt7621_spi_write(rs, MT7621_SPI_MASTER, master); + + rs->pending_write = 0; + + if (enable) + polar = BIT(cs); + mt7621_spi_write(rs, MT7621_SPI_POLAR, polar); +} + +static int mt7621_spi_prepare(struct spi_device *spi, unsigned int speed) +{ + struct mt7621_spi *rs = spidev_to_mt7621_spi(spi); + u32 rate; + u32 reg; + + dev_dbg(&spi->dev, "speed:%u\n", speed); + + rate = DIV_ROUND_UP(rs->sys_freq, speed); + dev_dbg(&spi->dev, "rate-1:%u\n", rate); + + if (rate > 4097) + return -EINVAL; + + if (rate < 2) + rate = 2; + + reg = mt7621_spi_read(rs, MT7621_SPI_MASTER); + reg &= ~MASTER_RS_CLK_SEL; + reg |= (rate - 2) << MASTER_RS_CLK_SEL_SHIFT; + rs->speed = speed; + + reg &= ~MT7621_LSB_FIRST; + if (spi->mode & SPI_LSB_FIRST) + reg |= MT7621_LSB_FIRST; + + /* + * This SPI controller seems to be tested on SPI flash only and some + * bits are swizzled under other SPI modes probably due to incorrect + * wiring inside the silicon. Only mode 0 works correctly. + */ + reg &= ~(MT7621_CPHA | MT7621_CPOL); + + mt7621_spi_write(rs, MT7621_SPI_MASTER, reg); + + return 0; +} + +static inline int mt7621_spi_wait_till_ready(struct mt7621_spi *rs) +{ + int i; + + for (i = 0; i < RALINK_SPI_WAIT_MAX_LOOP; i++) { + u32 status; + + status = mt7621_spi_read(rs, MT7621_SPI_TRANS); + if ((status & SPITRANS_BUSY) == 0) + return 0; + cpu_relax(); + udelay(1); + } + + return -ETIMEDOUT; +} + +static void mt7621_spi_read_half_duplex(struct mt7621_spi *rs, + int rx_len, u8 *buf) +{ + int tx_len; + + /* + * Combine with any pending write, and perform one or more half-duplex + * transactions reading 'len' bytes. Data to be written is already in + * MT7621_SPI_DATA. + */ + tx_len = rs->pending_write; + rs->pending_write = 0; + + while (rx_len || tx_len) { + int i; + u32 val = (min(tx_len, 4) * 8) << 24; + int rx = min(rx_len, 32); + + if (tx_len > 4) + val |= (tx_len - 4) * 8; + val |= (rx * 8) << 12; + mt7621_spi_write(rs, MT7621_SPI_MOREBUF, val); + + tx_len = 0; + + val = mt7621_spi_read(rs, MT7621_SPI_TRANS); + val |= SPI_CTL_START; + mt7621_spi_write(rs, MT7621_SPI_TRANS, val); + + mt7621_spi_wait_till_ready(rs); + + for (i = 0; i < rx; i++) { + if ((i % 4) == 0) + val = mt7621_spi_read(rs, MT7621_SPI_DATA0 + i); + *buf++ = val & 0xff; + val >>= 8; + } + + rx_len -= i; + } +} + +static inline void mt7621_spi_flush(struct mt7621_spi *rs) +{ + mt7621_spi_read_half_duplex(rs, 0, NULL); +} + +static void mt7621_spi_write_half_duplex(struct mt7621_spi *rs, + int tx_len, const u8 *buf) +{ + int len = rs->pending_write; + int val = 0; + + if (len & 3) { + val = mt7621_spi_read(rs, MT7621_SPI_OPCODE + (len & ~3)); + if (len < 4) { + val <<= (4 - len) * 8; + val = swab32(val); + } + } + + while (tx_len > 0) { + if (len >= 36) { + rs->pending_write = len; + mt7621_spi_flush(rs); + len = 0; + } + + val |= *buf++ << (8 * (len & 3)); + len++; + if ((len & 3) == 0) { + if (len == 4) + /* The byte-order of the opcode is weird! */ + val = swab32(val); + mt7621_spi_write(rs, MT7621_SPI_OPCODE + len - 4, val); + val = 0; + } + tx_len -= 1; + } + + if (len & 3) { + if (len < 4) { + val = swab32(val); + val >>= (4 - len) * 8; + } + mt7621_spi_write(rs, MT7621_SPI_OPCODE + (len & ~3), val); + } + + rs->pending_write = len; +} + +static int mt7621_spi_transfer_one_message(struct spi_controller *master, + struct spi_message *m) +{ + struct mt7621_spi *rs = spi_controller_get_devdata(master); + struct spi_device *spi = m->spi; + unsigned int speed = spi->max_speed_hz; + struct spi_transfer *t = NULL; + int status = 0; + + mt7621_spi_wait_till_ready(rs); + + list_for_each_entry(t, &m->transfers, transfer_list) + if (t->speed_hz < speed) + speed = t->speed_hz; + + if (mt7621_spi_prepare(spi, speed)) { + status = -EIO; + goto msg_done; + } + + /* Assert CS */ + mt7621_spi_set_cs(spi, 1); + + m->actual_length = 0; + list_for_each_entry(t, &m->transfers, transfer_list) { + if ((t->rx_buf) && (t->tx_buf)) { + /* + * This controller will shift some extra data out + * of spi_opcode if (mosi_bit_cnt > 0) && + * (cmd_bit_cnt == 0). So the claimed full-duplex + * support is broken since we have no way to read + * the MISO value during that bit. + */ + status = -EIO; + goto msg_done; + } else if (t->rx_buf) { + mt7621_spi_read_half_duplex(rs, t->len, t->rx_buf); + } else if (t->tx_buf) { + mt7621_spi_write_half_duplex(rs, t->len, t->tx_buf); + } + m->actual_length += t->len; + } + + /* Flush data and deassert CS */ + mt7621_spi_flush(rs); + mt7621_spi_set_cs(spi, 0); + +msg_done: + m->status = status; + spi_finalize_current_message(master); + + return 0; +} + +static int mt7621_spi_setup(struct spi_device *spi) +{ + struct mt7621_spi *rs = spidev_to_mt7621_spi(spi); + + if ((spi->max_speed_hz == 0) || + (spi->max_speed_hz > (rs->sys_freq / 2))) + spi->max_speed_hz = rs->sys_freq / 2; + + if (spi->max_speed_hz < (rs->sys_freq / 4097)) { + dev_err(&spi->dev, "setup: requested speed is too low %d Hz\n", + spi->max_speed_hz); + return -EINVAL; + } + + return 0; +} + +static const struct of_device_id mt7621_spi_match[] = { + { .compatible = "ralink,mt7621-spi" }, + {}, +}; +MODULE_DEVICE_TABLE(of, mt7621_spi_match); + +static int mt7621_spi_probe(struct platform_device *pdev) +{ + const struct of_device_id *match; + struct spi_controller *master; + struct mt7621_spi *rs; + void __iomem *base; + int status = 0; + struct clk *clk; + int ret; + + match = of_match_device(mt7621_spi_match, &pdev->dev); + if (!match) + return -EINVAL; + + base = devm_platform_ioremap_resource(pdev, 0); + if (IS_ERR(base)) + return PTR_ERR(base); + + clk = devm_clk_get(&pdev->dev, NULL); + if (IS_ERR(clk)) + return dev_err_probe(&pdev->dev, PTR_ERR(clk), + "unable to get SYS clock\n"); + + status = clk_prepare_enable(clk); + if (status) + return status; + + master = devm_spi_alloc_master(&pdev->dev, sizeof(*rs)); + if (!master) { + dev_info(&pdev->dev, "master allocation failed\n"); + clk_disable_unprepare(clk); + return -ENOMEM; + } + + master->mode_bits = SPI_LSB_FIRST; + master->flags = SPI_CONTROLLER_HALF_DUPLEX; + master->setup = mt7621_spi_setup; + master->transfer_one_message = mt7621_spi_transfer_one_message; + master->bits_per_word_mask = SPI_BPW_MASK(8); + master->dev.of_node = pdev->dev.of_node; + master->num_chipselect = 2; + + dev_set_drvdata(&pdev->dev, master); + + rs = spi_controller_get_devdata(master); + rs->base = base; + rs->clk = clk; + rs->master = master; + rs->sys_freq = clk_get_rate(rs->clk); + rs->pending_write = 0; + dev_info(&pdev->dev, "sys_freq: %u\n", rs->sys_freq); + + ret = device_reset(&pdev->dev); + if (ret) { + dev_err(&pdev->dev, "SPI reset failed!\n"); + clk_disable_unprepare(clk); + return ret; + } + + ret = spi_register_controller(master); + if (ret) + clk_disable_unprepare(clk); + + return ret; +} + +static int mt7621_spi_remove(struct platform_device *pdev) +{ + struct spi_controller *master; + struct mt7621_spi *rs; + + master = dev_get_drvdata(&pdev->dev); + rs = spi_controller_get_devdata(master); + + spi_unregister_controller(master); + clk_disable_unprepare(rs->clk); + + return 0; +} + +MODULE_ALIAS("platform:" DRIVER_NAME); + +static struct platform_driver mt7621_spi_driver = { + .driver = { + .name = DRIVER_NAME, + .of_match_table = mt7621_spi_match, + }, + .probe = mt7621_spi_probe, + .remove = mt7621_spi_remove, +}; + +module_platform_driver(mt7621_spi_driver); + +MODULE_DESCRIPTION("MT7621 SPI driver"); +MODULE_AUTHOR("Felix Fietkau <nbd@nbd.name>"); +MODULE_LICENSE("GPL"); diff --git a/drivers/spi/spi-mtk-nor.c b/drivers/spi/spi-mtk-nor.c new file mode 100644 index 000000000..106e3cacb --- /dev/null +++ b/drivers/spi/spi-mtk-nor.c @@ -0,0 +1,932 @@ +// SPDX-License-Identifier: GPL-2.0 +// +// Mediatek SPI NOR controller driver +// +// Copyright (C) 2020 Chuanhong Guo <gch981213@gmail.com> + +#include <linux/bits.h> +#include <linux/clk.h> +#include <linux/completion.h> +#include <linux/dma-mapping.h> +#include <linux/interrupt.h> +#include <linux/io.h> +#include <linux/iopoll.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/of_device.h> +#include <linux/pm_runtime.h> +#include <linux/spi/spi.h> +#include <linux/spi/spi-mem.h> +#include <linux/string.h> + +#define DRIVER_NAME "mtk-spi-nor" + +#define MTK_NOR_REG_CMD 0x00 +#define MTK_NOR_CMD_WRITE BIT(4) +#define MTK_NOR_CMD_PROGRAM BIT(2) +#define MTK_NOR_CMD_READ BIT(0) +#define MTK_NOR_CMD_MASK GENMASK(5, 0) + +#define MTK_NOR_REG_PRG_CNT 0x04 +#define MTK_NOR_PRG_CNT_MAX 56 +#define MTK_NOR_REG_RDATA 0x0c + +#define MTK_NOR_REG_RADR0 0x10 +#define MTK_NOR_REG_RADR(n) (MTK_NOR_REG_RADR0 + 4 * (n)) +#define MTK_NOR_REG_RADR3 0xc8 + +#define MTK_NOR_REG_WDATA 0x1c + +#define MTK_NOR_REG_PRGDATA0 0x20 +#define MTK_NOR_REG_PRGDATA(n) (MTK_NOR_REG_PRGDATA0 + 4 * (n)) +#define MTK_NOR_REG_PRGDATA_MAX 5 + +#define MTK_NOR_REG_SHIFT0 0x38 +#define MTK_NOR_REG_SHIFT(n) (MTK_NOR_REG_SHIFT0 + 4 * (n)) +#define MTK_NOR_REG_SHIFT_MAX 9 + +#define MTK_NOR_REG_CFG1 0x60 +#define MTK_NOR_FAST_READ BIT(0) + +#define MTK_NOR_REG_CFG2 0x64 +#define MTK_NOR_WR_CUSTOM_OP_EN BIT(4) +#define MTK_NOR_WR_BUF_EN BIT(0) + +#define MTK_NOR_REG_PP_DATA 0x98 + +#define MTK_NOR_REG_IRQ_STAT 0xa8 +#define MTK_NOR_REG_IRQ_EN 0xac +#define MTK_NOR_IRQ_DMA BIT(7) +#define MTK_NOR_IRQ_MASK GENMASK(7, 0) + +#define MTK_NOR_REG_CFG3 0xb4 +#define MTK_NOR_DISABLE_WREN BIT(7) +#define MTK_NOR_DISABLE_SR_POLL BIT(5) + +#define MTK_NOR_REG_WP 0xc4 +#define MTK_NOR_ENABLE_SF_CMD 0x30 + +#define MTK_NOR_REG_BUSCFG 0xcc +#define MTK_NOR_4B_ADDR BIT(4) +#define MTK_NOR_QUAD_ADDR BIT(3) +#define MTK_NOR_QUAD_READ BIT(2) +#define MTK_NOR_DUAL_ADDR BIT(1) +#define MTK_NOR_DUAL_READ BIT(0) +#define MTK_NOR_BUS_MODE_MASK GENMASK(4, 0) + +#define MTK_NOR_REG_DMA_CTL 0x718 +#define MTK_NOR_DMA_START BIT(0) + +#define MTK_NOR_REG_DMA_FADR 0x71c +#define MTK_NOR_REG_DMA_DADR 0x720 +#define MTK_NOR_REG_DMA_END_DADR 0x724 +#define MTK_NOR_REG_DMA_DADR_HB 0x738 +#define MTK_NOR_REG_DMA_END_DADR_HB 0x73c + +#define MTK_NOR_PRG_MAX_SIZE 6 +// Reading DMA src/dst addresses have to be 16-byte aligned +#define MTK_NOR_DMA_ALIGN 16 +#define MTK_NOR_DMA_ALIGN_MASK (MTK_NOR_DMA_ALIGN - 1) +// and we allocate a bounce buffer if destination address isn't aligned. +#define MTK_NOR_BOUNCE_BUF_SIZE PAGE_SIZE + +// Buffered page program can do one 128-byte transfer +#define MTK_NOR_PP_SIZE 128 + +#define CLK_TO_US(sp, clkcnt) DIV_ROUND_UP(clkcnt, sp->spi_freq / 1000000) + +struct mtk_nor { + struct spi_controller *ctlr; + struct device *dev; + void __iomem *base; + u8 *buffer; + dma_addr_t buffer_dma; + struct clk *spi_clk; + struct clk *ctlr_clk; + unsigned int spi_freq; + bool wbuf_en; + bool has_irq; + bool high_dma; + struct completion op_done; +}; + +static inline void mtk_nor_rmw(struct mtk_nor *sp, u32 reg, u32 set, u32 clr) +{ + u32 val = readl(sp->base + reg); + + val &= ~clr; + val |= set; + writel(val, sp->base + reg); +} + +static inline int mtk_nor_cmd_exec(struct mtk_nor *sp, u32 cmd, ulong clk) +{ + ulong delay = CLK_TO_US(sp, clk); + u32 reg; + int ret; + + writel(cmd, sp->base + MTK_NOR_REG_CMD); + ret = readl_poll_timeout(sp->base + MTK_NOR_REG_CMD, reg, !(reg & cmd), + delay / 3, (delay + 1) * 200); + if (ret < 0) + dev_err(sp->dev, "command %u timeout.\n", cmd); + return ret; +} + +static void mtk_nor_set_addr(struct mtk_nor *sp, const struct spi_mem_op *op) +{ + u32 addr = op->addr.val; + int i; + + for (i = 0; i < 3; i++) { + writeb(addr & 0xff, sp->base + MTK_NOR_REG_RADR(i)); + addr >>= 8; + } + if (op->addr.nbytes == 4) { + writeb(addr & 0xff, sp->base + MTK_NOR_REG_RADR3); + mtk_nor_rmw(sp, MTK_NOR_REG_BUSCFG, MTK_NOR_4B_ADDR, 0); + } else { + mtk_nor_rmw(sp, MTK_NOR_REG_BUSCFG, 0, MTK_NOR_4B_ADDR); + } +} + +static bool need_bounce(struct mtk_nor *sp, const struct spi_mem_op *op) +{ + return ((uintptr_t)op->data.buf.in & MTK_NOR_DMA_ALIGN_MASK); +} + +static bool mtk_nor_match_read(const struct spi_mem_op *op) +{ + int dummy = 0; + + if (op->dummy.buswidth) + dummy = op->dummy.nbytes * BITS_PER_BYTE / op->dummy.buswidth; + + if ((op->data.buswidth == 2) || (op->data.buswidth == 4)) { + if (op->addr.buswidth == 1) + return dummy == 8; + else if (op->addr.buswidth == 2) + return dummy == 4; + else if (op->addr.buswidth == 4) + return dummy == 6; + } else if ((op->addr.buswidth == 1) && (op->data.buswidth == 1)) { + if (op->cmd.opcode == 0x03) + return dummy == 0; + else if (op->cmd.opcode == 0x0b) + return dummy == 8; + } + return false; +} + +static bool mtk_nor_match_prg(const struct spi_mem_op *op) +{ + int tx_len, rx_len, prg_len, prg_left; + + // prg mode is spi-only. + if ((op->cmd.buswidth > 1) || (op->addr.buswidth > 1) || + (op->dummy.buswidth > 1) || (op->data.buswidth > 1)) + return false; + + tx_len = op->cmd.nbytes + op->addr.nbytes; + + if (op->data.dir == SPI_MEM_DATA_OUT) { + // count dummy bytes only if we need to write data after it + tx_len += op->dummy.nbytes; + + // leave at least one byte for data + if (tx_len > MTK_NOR_REG_PRGDATA_MAX) + return false; + + // if there's no addr, meaning adjust_op_size is impossible, + // check data length as well. + if ((!op->addr.nbytes) && + (tx_len + op->data.nbytes > MTK_NOR_REG_PRGDATA_MAX + 1)) + return false; + } else if (op->data.dir == SPI_MEM_DATA_IN) { + if (tx_len > MTK_NOR_REG_PRGDATA_MAX + 1) + return false; + + rx_len = op->data.nbytes; + prg_left = MTK_NOR_PRG_CNT_MAX / 8 - tx_len - op->dummy.nbytes; + if (prg_left > MTK_NOR_REG_SHIFT_MAX + 1) + prg_left = MTK_NOR_REG_SHIFT_MAX + 1; + if (rx_len > prg_left) { + if (!op->addr.nbytes) + return false; + rx_len = prg_left; + } + + prg_len = tx_len + op->dummy.nbytes + rx_len; + if (prg_len > MTK_NOR_PRG_CNT_MAX / 8) + return false; + } else { + prg_len = tx_len + op->dummy.nbytes; + if (prg_len > MTK_NOR_PRG_CNT_MAX / 8) + return false; + } + return true; +} + +static void mtk_nor_adj_prg_size(struct spi_mem_op *op) +{ + int tx_len, tx_left, prg_left; + + tx_len = op->cmd.nbytes + op->addr.nbytes; + if (op->data.dir == SPI_MEM_DATA_OUT) { + tx_len += op->dummy.nbytes; + tx_left = MTK_NOR_REG_PRGDATA_MAX + 1 - tx_len; + if (op->data.nbytes > tx_left) + op->data.nbytes = tx_left; + } else if (op->data.dir == SPI_MEM_DATA_IN) { + prg_left = MTK_NOR_PRG_CNT_MAX / 8 - tx_len - op->dummy.nbytes; + if (prg_left > MTK_NOR_REG_SHIFT_MAX + 1) + prg_left = MTK_NOR_REG_SHIFT_MAX + 1; + if (op->data.nbytes > prg_left) + op->data.nbytes = prg_left; + } +} + +static int mtk_nor_adjust_op_size(struct spi_mem *mem, struct spi_mem_op *op) +{ + struct mtk_nor *sp = spi_controller_get_devdata(mem->spi->master); + + if (!op->data.nbytes) + return 0; + + if ((op->addr.nbytes == 3) || (op->addr.nbytes == 4)) { + if ((op->data.dir == SPI_MEM_DATA_IN) && + mtk_nor_match_read(op)) { + // limit size to prevent timeout calculation overflow + if (op->data.nbytes > 0x400000) + op->data.nbytes = 0x400000; + + if ((op->addr.val & MTK_NOR_DMA_ALIGN_MASK) || + (op->data.nbytes < MTK_NOR_DMA_ALIGN)) + op->data.nbytes = 1; + else if (!need_bounce(sp, op)) + op->data.nbytes &= ~MTK_NOR_DMA_ALIGN_MASK; + else if (op->data.nbytes > MTK_NOR_BOUNCE_BUF_SIZE) + op->data.nbytes = MTK_NOR_BOUNCE_BUF_SIZE; + return 0; + } else if (op->data.dir == SPI_MEM_DATA_OUT) { + if (op->data.nbytes >= MTK_NOR_PP_SIZE) + op->data.nbytes = MTK_NOR_PP_SIZE; + else + op->data.nbytes = 1; + return 0; + } + } + + mtk_nor_adj_prg_size(op); + return 0; +} + +static bool mtk_nor_supports_op(struct spi_mem *mem, + const struct spi_mem_op *op) +{ + if (!spi_mem_default_supports_op(mem, op)) + return false; + + if (op->cmd.buswidth != 1) + return false; + + if ((op->addr.nbytes == 3) || (op->addr.nbytes == 4)) { + switch(op->data.dir) { + case SPI_MEM_DATA_IN: + if (mtk_nor_match_read(op)) + return true; + break; + case SPI_MEM_DATA_OUT: + if ((op->addr.buswidth == 1) && + (op->dummy.nbytes == 0) && + (op->data.buswidth == 1)) + return true; + break; + default: + break; + } + } + + return mtk_nor_match_prg(op); +} + +static void mtk_nor_setup_bus(struct mtk_nor *sp, const struct spi_mem_op *op) +{ + u32 reg = 0; + + if (op->addr.nbytes == 4) + reg |= MTK_NOR_4B_ADDR; + + if (op->data.buswidth == 4) { + reg |= MTK_NOR_QUAD_READ; + writeb(op->cmd.opcode, sp->base + MTK_NOR_REG_PRGDATA(4)); + if (op->addr.buswidth == 4) + reg |= MTK_NOR_QUAD_ADDR; + } else if (op->data.buswidth == 2) { + reg |= MTK_NOR_DUAL_READ; + writeb(op->cmd.opcode, sp->base + MTK_NOR_REG_PRGDATA(3)); + if (op->addr.buswidth == 2) + reg |= MTK_NOR_DUAL_ADDR; + } else { + if (op->cmd.opcode == 0x0b) + mtk_nor_rmw(sp, MTK_NOR_REG_CFG1, MTK_NOR_FAST_READ, 0); + else + mtk_nor_rmw(sp, MTK_NOR_REG_CFG1, 0, MTK_NOR_FAST_READ); + } + mtk_nor_rmw(sp, MTK_NOR_REG_BUSCFG, reg, MTK_NOR_BUS_MODE_MASK); +} + +static int mtk_nor_dma_exec(struct mtk_nor *sp, u32 from, unsigned int length, + dma_addr_t dma_addr) +{ + int ret = 0; + ulong delay; + u32 reg; + + writel(from, sp->base + MTK_NOR_REG_DMA_FADR); + writel(dma_addr, sp->base + MTK_NOR_REG_DMA_DADR); + writel(dma_addr + length, sp->base + MTK_NOR_REG_DMA_END_DADR); + + if (sp->high_dma) { + writel(upper_32_bits(dma_addr), + sp->base + MTK_NOR_REG_DMA_DADR_HB); + writel(upper_32_bits(dma_addr + length), + sp->base + MTK_NOR_REG_DMA_END_DADR_HB); + } + + if (sp->has_irq) { + reinit_completion(&sp->op_done); + mtk_nor_rmw(sp, MTK_NOR_REG_IRQ_EN, MTK_NOR_IRQ_DMA, 0); + } + + mtk_nor_rmw(sp, MTK_NOR_REG_DMA_CTL, MTK_NOR_DMA_START, 0); + + delay = CLK_TO_US(sp, (length + 5) * BITS_PER_BYTE); + + if (sp->has_irq) { + if (!wait_for_completion_timeout(&sp->op_done, + (delay + 1) * 100)) + ret = -ETIMEDOUT; + } else { + ret = readl_poll_timeout(sp->base + MTK_NOR_REG_DMA_CTL, reg, + !(reg & MTK_NOR_DMA_START), delay / 3, + (delay + 1) * 100); + } + + if (ret < 0) + dev_err(sp->dev, "dma read timeout.\n"); + + return ret; +} + +static int mtk_nor_read_bounce(struct mtk_nor *sp, const struct spi_mem_op *op) +{ + unsigned int rdlen; + int ret; + + if (op->data.nbytes & MTK_NOR_DMA_ALIGN_MASK) + rdlen = (op->data.nbytes + MTK_NOR_DMA_ALIGN) & ~MTK_NOR_DMA_ALIGN_MASK; + else + rdlen = op->data.nbytes; + + ret = mtk_nor_dma_exec(sp, op->addr.val, rdlen, sp->buffer_dma); + + if (!ret) + memcpy(op->data.buf.in, sp->buffer, op->data.nbytes); + + return ret; +} + +static int mtk_nor_read_dma(struct mtk_nor *sp, const struct spi_mem_op *op) +{ + int ret; + dma_addr_t dma_addr; + + if (need_bounce(sp, op)) + return mtk_nor_read_bounce(sp, op); + + dma_addr = dma_map_single(sp->dev, op->data.buf.in, + op->data.nbytes, DMA_FROM_DEVICE); + + if (dma_mapping_error(sp->dev, dma_addr)) + return -EINVAL; + + ret = mtk_nor_dma_exec(sp, op->addr.val, op->data.nbytes, dma_addr); + + dma_unmap_single(sp->dev, dma_addr, op->data.nbytes, DMA_FROM_DEVICE); + + return ret; +} + +static int mtk_nor_read_pio(struct mtk_nor *sp, const struct spi_mem_op *op) +{ + u8 *buf = op->data.buf.in; + int ret; + + ret = mtk_nor_cmd_exec(sp, MTK_NOR_CMD_READ, 6 * BITS_PER_BYTE); + if (!ret) + buf[0] = readb(sp->base + MTK_NOR_REG_RDATA); + return ret; +} + +static int mtk_nor_write_buffer_enable(struct mtk_nor *sp) +{ + int ret; + u32 val; + + if (sp->wbuf_en) + return 0; + + val = readl(sp->base + MTK_NOR_REG_CFG2); + writel(val | MTK_NOR_WR_BUF_EN, sp->base + MTK_NOR_REG_CFG2); + ret = readl_poll_timeout(sp->base + MTK_NOR_REG_CFG2, val, + val & MTK_NOR_WR_BUF_EN, 0, 10000); + if (!ret) + sp->wbuf_en = true; + return ret; +} + +static int mtk_nor_write_buffer_disable(struct mtk_nor *sp) +{ + int ret; + u32 val; + + if (!sp->wbuf_en) + return 0; + val = readl(sp->base + MTK_NOR_REG_CFG2); + writel(val & ~MTK_NOR_WR_BUF_EN, sp->base + MTK_NOR_REG_CFG2); + ret = readl_poll_timeout(sp->base + MTK_NOR_REG_CFG2, val, + !(val & MTK_NOR_WR_BUF_EN), 0, 10000); + if (!ret) + sp->wbuf_en = false; + return ret; +} + +static int mtk_nor_pp_buffered(struct mtk_nor *sp, const struct spi_mem_op *op) +{ + const u8 *buf = op->data.buf.out; + u32 val; + int ret, i; + + ret = mtk_nor_write_buffer_enable(sp); + if (ret < 0) + return ret; + + for (i = 0; i < op->data.nbytes; i += 4) { + val = buf[i + 3] << 24 | buf[i + 2] << 16 | buf[i + 1] << 8 | + buf[i]; + writel(val, sp->base + MTK_NOR_REG_PP_DATA); + } + return mtk_nor_cmd_exec(sp, MTK_NOR_CMD_WRITE, + (op->data.nbytes + 5) * BITS_PER_BYTE); +} + +static int mtk_nor_pp_unbuffered(struct mtk_nor *sp, + const struct spi_mem_op *op) +{ + const u8 *buf = op->data.buf.out; + int ret; + + ret = mtk_nor_write_buffer_disable(sp); + if (ret < 0) + return ret; + writeb(buf[0], sp->base + MTK_NOR_REG_WDATA); + return mtk_nor_cmd_exec(sp, MTK_NOR_CMD_WRITE, 6 * BITS_PER_BYTE); +} + +static int mtk_nor_spi_mem_prg(struct mtk_nor *sp, const struct spi_mem_op *op) +{ + int rx_len = 0; + int reg_offset = MTK_NOR_REG_PRGDATA_MAX; + int tx_len, prg_len; + int i, ret; + void __iomem *reg; + u8 bufbyte; + + tx_len = op->cmd.nbytes + op->addr.nbytes; + + // count dummy bytes only if we need to write data after it + if (op->data.dir == SPI_MEM_DATA_OUT) + tx_len += op->dummy.nbytes + op->data.nbytes; + else if (op->data.dir == SPI_MEM_DATA_IN) + rx_len = op->data.nbytes; + + prg_len = op->cmd.nbytes + op->addr.nbytes + op->dummy.nbytes + + op->data.nbytes; + + // an invalid op may reach here if the caller calls exec_op without + // adjust_op_size. return -EINVAL instead of -ENOTSUPP so that + // spi-mem won't try this op again with generic spi transfers. + if ((tx_len > MTK_NOR_REG_PRGDATA_MAX + 1) || + (rx_len > MTK_NOR_REG_SHIFT_MAX + 1) || + (prg_len > MTK_NOR_PRG_CNT_MAX / 8)) + return -EINVAL; + + // fill tx data + for (i = op->cmd.nbytes; i > 0; i--, reg_offset--) { + reg = sp->base + MTK_NOR_REG_PRGDATA(reg_offset); + bufbyte = (op->cmd.opcode >> ((i - 1) * BITS_PER_BYTE)) & 0xff; + writeb(bufbyte, reg); + } + + for (i = op->addr.nbytes; i > 0; i--, reg_offset--) { + reg = sp->base + MTK_NOR_REG_PRGDATA(reg_offset); + bufbyte = (op->addr.val >> ((i - 1) * BITS_PER_BYTE)) & 0xff; + writeb(bufbyte, reg); + } + + if (op->data.dir == SPI_MEM_DATA_OUT) { + for (i = 0; i < op->dummy.nbytes; i++, reg_offset--) { + reg = sp->base + MTK_NOR_REG_PRGDATA(reg_offset); + writeb(0, reg); + } + + for (i = 0; i < op->data.nbytes; i++, reg_offset--) { + reg = sp->base + MTK_NOR_REG_PRGDATA(reg_offset); + writeb(((const u8 *)(op->data.buf.out))[i], reg); + } + } + + for (; reg_offset >= 0; reg_offset--) { + reg = sp->base + MTK_NOR_REG_PRGDATA(reg_offset); + writeb(0, reg); + } + + // trigger op + writel(prg_len * BITS_PER_BYTE, sp->base + MTK_NOR_REG_PRG_CNT); + ret = mtk_nor_cmd_exec(sp, MTK_NOR_CMD_PROGRAM, + prg_len * BITS_PER_BYTE); + if (ret) + return ret; + + // fetch read data + reg_offset = 0; + if (op->data.dir == SPI_MEM_DATA_IN) { + for (i = op->data.nbytes - 1; i >= 0; i--, reg_offset++) { + reg = sp->base + MTK_NOR_REG_SHIFT(reg_offset); + ((u8 *)(op->data.buf.in))[i] = readb(reg); + } + } + + return 0; +} + +static int mtk_nor_exec_op(struct spi_mem *mem, const struct spi_mem_op *op) +{ + struct mtk_nor *sp = spi_controller_get_devdata(mem->spi->master); + int ret; + + if ((op->data.nbytes == 0) || + ((op->addr.nbytes != 3) && (op->addr.nbytes != 4))) + return mtk_nor_spi_mem_prg(sp, op); + + if (op->data.dir == SPI_MEM_DATA_OUT) { + mtk_nor_set_addr(sp, op); + writeb(op->cmd.opcode, sp->base + MTK_NOR_REG_PRGDATA0); + if (op->data.nbytes == MTK_NOR_PP_SIZE) + return mtk_nor_pp_buffered(sp, op); + return mtk_nor_pp_unbuffered(sp, op); + } + + if ((op->data.dir == SPI_MEM_DATA_IN) && mtk_nor_match_read(op)) { + ret = mtk_nor_write_buffer_disable(sp); + if (ret < 0) + return ret; + mtk_nor_setup_bus(sp, op); + if (op->data.nbytes == 1) { + mtk_nor_set_addr(sp, op); + return mtk_nor_read_pio(sp, op); + } else { + return mtk_nor_read_dma(sp, op); + } + } + + return mtk_nor_spi_mem_prg(sp, op); +} + +static int mtk_nor_setup(struct spi_device *spi) +{ + struct mtk_nor *sp = spi_controller_get_devdata(spi->master); + + if (spi->max_speed_hz && (spi->max_speed_hz < sp->spi_freq)) { + dev_err(&spi->dev, "spi clock should be %u Hz.\n", + sp->spi_freq); + return -EINVAL; + } + spi->max_speed_hz = sp->spi_freq; + + return 0; +} + +static int mtk_nor_transfer_one_message(struct spi_controller *master, + struct spi_message *m) +{ + struct mtk_nor *sp = spi_controller_get_devdata(master); + struct spi_transfer *t = NULL; + unsigned long trx_len = 0; + int stat = 0; + int reg_offset = MTK_NOR_REG_PRGDATA_MAX; + void __iomem *reg; + const u8 *txbuf; + u8 *rxbuf; + int i; + + list_for_each_entry(t, &m->transfers, transfer_list) { + txbuf = t->tx_buf; + for (i = 0; i < t->len; i++, reg_offset--) { + reg = sp->base + MTK_NOR_REG_PRGDATA(reg_offset); + if (txbuf) + writeb(txbuf[i], reg); + else + writeb(0, reg); + } + trx_len += t->len; + } + + writel(trx_len * BITS_PER_BYTE, sp->base + MTK_NOR_REG_PRG_CNT); + + stat = mtk_nor_cmd_exec(sp, MTK_NOR_CMD_PROGRAM, + trx_len * BITS_PER_BYTE); + if (stat < 0) + goto msg_done; + + reg_offset = trx_len - 1; + list_for_each_entry(t, &m->transfers, transfer_list) { + rxbuf = t->rx_buf; + for (i = 0; i < t->len; i++, reg_offset--) { + reg = sp->base + MTK_NOR_REG_SHIFT(reg_offset); + if (rxbuf) + rxbuf[i] = readb(reg); + } + } + + m->actual_length = trx_len; +msg_done: + m->status = stat; + spi_finalize_current_message(master); + + return 0; +} + +static void mtk_nor_disable_clk(struct mtk_nor *sp) +{ + clk_disable_unprepare(sp->spi_clk); + clk_disable_unprepare(sp->ctlr_clk); +} + +static int mtk_nor_enable_clk(struct mtk_nor *sp) +{ + int ret; + + ret = clk_prepare_enable(sp->spi_clk); + if (ret) + return ret; + + ret = clk_prepare_enable(sp->ctlr_clk); + if (ret) { + clk_disable_unprepare(sp->spi_clk); + return ret; + } + + return 0; +} + +static void mtk_nor_init(struct mtk_nor *sp) +{ + writel(0, sp->base + MTK_NOR_REG_IRQ_EN); + writel(MTK_NOR_IRQ_MASK, sp->base + MTK_NOR_REG_IRQ_STAT); + + writel(MTK_NOR_ENABLE_SF_CMD, sp->base + MTK_NOR_REG_WP); + mtk_nor_rmw(sp, MTK_NOR_REG_CFG2, MTK_NOR_WR_CUSTOM_OP_EN, 0); + mtk_nor_rmw(sp, MTK_NOR_REG_CFG3, + MTK_NOR_DISABLE_WREN | MTK_NOR_DISABLE_SR_POLL, 0); +} + +static irqreturn_t mtk_nor_irq_handler(int irq, void *data) +{ + struct mtk_nor *sp = data; + u32 irq_status, irq_enabled; + + irq_status = readl(sp->base + MTK_NOR_REG_IRQ_STAT); + irq_enabled = readl(sp->base + MTK_NOR_REG_IRQ_EN); + // write status back to clear interrupt + writel(irq_status, sp->base + MTK_NOR_REG_IRQ_STAT); + + if (!(irq_status & irq_enabled)) + return IRQ_NONE; + + if (irq_status & MTK_NOR_IRQ_DMA) { + complete(&sp->op_done); + writel(0, sp->base + MTK_NOR_REG_IRQ_EN); + } + + return IRQ_HANDLED; +} + +static size_t mtk_max_msg_size(struct spi_device *spi) +{ + return MTK_NOR_PRG_MAX_SIZE; +} + +static const struct spi_controller_mem_ops mtk_nor_mem_ops = { + .adjust_op_size = mtk_nor_adjust_op_size, + .supports_op = mtk_nor_supports_op, + .exec_op = mtk_nor_exec_op +}; + +static const struct of_device_id mtk_nor_match[] = { + { .compatible = "mediatek,mt8192-nor", .data = (void *)36 }, + { .compatible = "mediatek,mt8173-nor", .data = (void *)32 }, + { /* sentinel */ } +}; +MODULE_DEVICE_TABLE(of, mtk_nor_match); + +static int mtk_nor_probe(struct platform_device *pdev) +{ + struct spi_controller *ctlr; + struct mtk_nor *sp; + void __iomem *base; + struct clk *spi_clk, *ctlr_clk; + int ret, irq; + unsigned long dma_bits; + + base = devm_platform_ioremap_resource(pdev, 0); + if (IS_ERR(base)) + return PTR_ERR(base); + + spi_clk = devm_clk_get(&pdev->dev, "spi"); + if (IS_ERR(spi_clk)) + return PTR_ERR(spi_clk); + + ctlr_clk = devm_clk_get(&pdev->dev, "sf"); + if (IS_ERR(ctlr_clk)) + return PTR_ERR(ctlr_clk); + + dma_bits = (unsigned long)of_device_get_match_data(&pdev->dev); + if (dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(dma_bits))) { + dev_err(&pdev->dev, "failed to set dma mask(%lu)\n", dma_bits); + return -EINVAL; + } + + ctlr = devm_spi_alloc_master(&pdev->dev, sizeof(*sp)); + if (!ctlr) { + dev_err(&pdev->dev, "failed to allocate spi controller\n"); + return -ENOMEM; + } + + ctlr->bits_per_word_mask = SPI_BPW_MASK(8); + ctlr->dev.of_node = pdev->dev.of_node; + ctlr->max_message_size = mtk_max_msg_size; + ctlr->mem_ops = &mtk_nor_mem_ops; + ctlr->mode_bits = SPI_RX_DUAL | SPI_RX_QUAD | SPI_TX_DUAL | SPI_TX_QUAD; + ctlr->num_chipselect = 1; + ctlr->setup = mtk_nor_setup; + ctlr->transfer_one_message = mtk_nor_transfer_one_message; + ctlr->auto_runtime_pm = true; + + dev_set_drvdata(&pdev->dev, ctlr); + + sp = spi_controller_get_devdata(ctlr); + sp->base = base; + sp->has_irq = false; + sp->wbuf_en = false; + sp->ctlr = ctlr; + sp->dev = &pdev->dev; + sp->spi_clk = spi_clk; + sp->ctlr_clk = ctlr_clk; + sp->high_dma = (dma_bits > 32); + sp->buffer = dmam_alloc_coherent(&pdev->dev, + MTK_NOR_BOUNCE_BUF_SIZE + MTK_NOR_DMA_ALIGN, + &sp->buffer_dma, GFP_KERNEL); + if (!sp->buffer) + return -ENOMEM; + + if ((uintptr_t)sp->buffer & MTK_NOR_DMA_ALIGN_MASK) { + dev_err(sp->dev, "misaligned allocation of internal buffer.\n"); + return -ENOMEM; + } + + ret = mtk_nor_enable_clk(sp); + if (ret < 0) + return ret; + + sp->spi_freq = clk_get_rate(sp->spi_clk); + + mtk_nor_init(sp); + + irq = platform_get_irq_optional(pdev, 0); + + if (irq < 0) { + dev_warn(sp->dev, "IRQ not available."); + } else { + ret = devm_request_irq(sp->dev, irq, mtk_nor_irq_handler, 0, + pdev->name, sp); + if (ret < 0) { + dev_warn(sp->dev, "failed to request IRQ."); + } else { + init_completion(&sp->op_done); + sp->has_irq = true; + } + } + + pm_runtime_set_autosuspend_delay(&pdev->dev, -1); + pm_runtime_use_autosuspend(&pdev->dev); + pm_runtime_set_active(&pdev->dev); + pm_runtime_enable(&pdev->dev); + pm_runtime_get_noresume(&pdev->dev); + + ret = devm_spi_register_controller(&pdev->dev, ctlr); + if (ret < 0) + goto err_probe; + + pm_runtime_mark_last_busy(&pdev->dev); + pm_runtime_put_autosuspend(&pdev->dev); + + dev_info(&pdev->dev, "spi frequency: %d Hz\n", sp->spi_freq); + + return 0; + +err_probe: + pm_runtime_disable(&pdev->dev); + pm_runtime_set_suspended(&pdev->dev); + pm_runtime_dont_use_autosuspend(&pdev->dev); + + mtk_nor_disable_clk(sp); + + return ret; +} + +static int mtk_nor_remove(struct platform_device *pdev) +{ + struct spi_controller *ctlr = dev_get_drvdata(&pdev->dev); + struct mtk_nor *sp = spi_controller_get_devdata(ctlr); + + pm_runtime_disable(&pdev->dev); + pm_runtime_set_suspended(&pdev->dev); + pm_runtime_dont_use_autosuspend(&pdev->dev); + + mtk_nor_disable_clk(sp); + + return 0; +} + +static int __maybe_unused mtk_nor_runtime_suspend(struct device *dev) +{ + struct spi_controller *ctlr = dev_get_drvdata(dev); + struct mtk_nor *sp = spi_controller_get_devdata(ctlr); + + mtk_nor_disable_clk(sp); + + return 0; +} + +static int __maybe_unused mtk_nor_runtime_resume(struct device *dev) +{ + struct spi_controller *ctlr = dev_get_drvdata(dev); + struct mtk_nor *sp = spi_controller_get_devdata(ctlr); + + return mtk_nor_enable_clk(sp); +} + +static int __maybe_unused mtk_nor_suspend(struct device *dev) +{ + return pm_runtime_force_suspend(dev); +} + +static int __maybe_unused mtk_nor_resume(struct device *dev) +{ + struct spi_controller *ctlr = dev_get_drvdata(dev); + struct mtk_nor *sp = spi_controller_get_devdata(ctlr); + int ret; + + ret = pm_runtime_force_resume(dev); + if (ret) + return ret; + + mtk_nor_init(sp); + + return 0; +} + +static const struct dev_pm_ops mtk_nor_pm_ops = { + SET_RUNTIME_PM_OPS(mtk_nor_runtime_suspend, + mtk_nor_runtime_resume, NULL) + SET_SYSTEM_SLEEP_PM_OPS(mtk_nor_suspend, mtk_nor_resume) +}; + +static struct platform_driver mtk_nor_driver = { + .driver = { + .name = DRIVER_NAME, + .of_match_table = mtk_nor_match, + .pm = &mtk_nor_pm_ops, + }, + .probe = mtk_nor_probe, + .remove = mtk_nor_remove, +}; + +module_platform_driver(mtk_nor_driver); + +MODULE_DESCRIPTION("Mediatek SPI NOR controller driver"); +MODULE_AUTHOR("Chuanhong Guo <gch981213@gmail.com>"); +MODULE_LICENSE("GPL v2"); +MODULE_ALIAS("platform:" DRIVER_NAME); diff --git a/drivers/spi/spi-mux.c b/drivers/spi/spi-mux.c new file mode 100644 index 000000000..9708b7827 --- /dev/null +++ b/drivers/spi/spi-mux.c @@ -0,0 +1,194 @@ +// SPDX-License-Identifier: GPL-2.0 +// +// General Purpose SPI multiplexer + +#include <linux/err.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/mux/consumer.h> +#include <linux/slab.h> +#include <linux/spi/spi.h> + +#define SPI_MUX_NO_CS ((unsigned int)-1) + +/** + * DOC: Driver description + * + * This driver supports a MUX on an SPI bus. This can be useful when you need + * more chip selects than the hardware peripherals support, or than are + * available in a particular board setup. + * + * The driver will create an additional SPI controller. Devices added under the + * mux will be handled as 'chip selects' on this controller. + */ + +/** + * struct spi_mux_priv - the basic spi_mux structure + * @spi: pointer to the device struct attached to the parent + * spi controller + * @current_cs: The current chip select set in the mux + * @child_msg_complete: The mux replaces the complete callback in the child's + * message to its own callback; this field is used by the + * driver to store the child's callback during a transfer + * @child_msg_context: Used to store the child's context to the callback + * @child_msg_dev: Used to store the spi_device pointer to the child + * @mux: mux_control structure used to provide chip selects for + * downstream spi devices + */ +struct spi_mux_priv { + struct spi_device *spi; + unsigned int current_cs; + + void (*child_msg_complete)(void *context); + void *child_msg_context; + struct spi_device *child_msg_dev; + struct mux_control *mux; +}; + +/* should not get called when the parent controller is doing a transfer */ +static int spi_mux_select(struct spi_device *spi) +{ + struct spi_mux_priv *priv = spi_controller_get_devdata(spi->controller); + int ret; + + ret = mux_control_select(priv->mux, spi->chip_select); + if (ret) + return ret; + + if (priv->current_cs == spi->chip_select) + return 0; + + dev_dbg(&priv->spi->dev, "setting up the mux for cs %d\n", + spi->chip_select); + + /* copy the child device's settings except for the cs */ + priv->spi->max_speed_hz = spi->max_speed_hz; + priv->spi->mode = spi->mode; + priv->spi->bits_per_word = spi->bits_per_word; + + priv->current_cs = spi->chip_select; + + return 0; +} + +static int spi_mux_setup(struct spi_device *spi) +{ + struct spi_mux_priv *priv = spi_controller_get_devdata(spi->controller); + + /* + * can be called multiple times, won't do a valid setup now but we will + * change the settings when we do a transfer (necessary because we + * can't predict from which device it will be anyway) + */ + return spi_setup(priv->spi); +} + +static void spi_mux_complete_cb(void *context) +{ + struct spi_mux_priv *priv = (struct spi_mux_priv *)context; + struct spi_controller *ctlr = spi_get_drvdata(priv->spi); + struct spi_message *m = ctlr->cur_msg; + + m->complete = priv->child_msg_complete; + m->context = priv->child_msg_context; + m->spi = priv->child_msg_dev; + spi_finalize_current_message(ctlr); + mux_control_deselect(priv->mux); +} + +static int spi_mux_transfer_one_message(struct spi_controller *ctlr, + struct spi_message *m) +{ + struct spi_mux_priv *priv = spi_controller_get_devdata(ctlr); + struct spi_device *spi = m->spi; + int ret; + + ret = spi_mux_select(spi); + if (ret) + return ret; + + /* + * Replace the complete callback, context and spi_device with our own + * pointers. Save originals + */ + priv->child_msg_complete = m->complete; + priv->child_msg_context = m->context; + priv->child_msg_dev = m->spi; + + m->complete = spi_mux_complete_cb; + m->context = priv; + m->spi = priv->spi; + + /* do the transfer */ + return spi_async(priv->spi, m); +} + +static int spi_mux_probe(struct spi_device *spi) +{ + struct spi_controller *ctlr; + struct spi_mux_priv *priv; + int ret; + + ctlr = spi_alloc_master(&spi->dev, sizeof(*priv)); + if (!ctlr) + return -ENOMEM; + + spi_set_drvdata(spi, ctlr); + priv = spi_controller_get_devdata(ctlr); + priv->spi = spi; + + priv->mux = devm_mux_control_get(&spi->dev, NULL); + if (IS_ERR(priv->mux)) { + ret = dev_err_probe(&spi->dev, PTR_ERR(priv->mux), + "failed to get control-mux\n"); + goto err_put_ctlr; + } + + priv->current_cs = SPI_MUX_NO_CS; + + /* supported modes are the same as our parent's */ + ctlr->mode_bits = spi->controller->mode_bits; + ctlr->flags = spi->controller->flags; + ctlr->transfer_one_message = spi_mux_transfer_one_message; + ctlr->setup = spi_mux_setup; + ctlr->num_chipselect = mux_control_states(priv->mux); + ctlr->bus_num = -1; + ctlr->dev.of_node = spi->dev.of_node; + + ret = devm_spi_register_controller(&spi->dev, ctlr); + if (ret) + goto err_put_ctlr; + + return 0; + +err_put_ctlr: + spi_controller_put(ctlr); + + return ret; +} + +static const struct spi_device_id spi_mux_id[] = { + { "spi-mux" }, + { } +}; +MODULE_DEVICE_TABLE(spi, spi_mux_id); + +static const struct of_device_id spi_mux_of_match[] = { + { .compatible = "spi-mux" }, + { } +}; +MODULE_DEVICE_TABLE(of, spi_mux_of_match); + +static struct spi_driver spi_mux_driver = { + .probe = spi_mux_probe, + .driver = { + .name = "spi-mux", + .of_match_table = spi_mux_of_match, + }, + .id_table = spi_mux_id, +}; + +module_spi_driver(spi_mux_driver); + +MODULE_DESCRIPTION("SPI multiplexer"); +MODULE_LICENSE("GPL"); diff --git a/drivers/spi/spi-mxic.c b/drivers/spi/spi-mxic.c new file mode 100644 index 000000000..4fb19e6f9 --- /dev/null +++ b/drivers/spi/spi-mxic.c @@ -0,0 +1,608 @@ +// SPDX-License-Identifier: GPL-2.0 +// +// Copyright (C) 2018 Macronix International Co., Ltd. +// +// Authors: +// Mason Yang <masonccyang@mxic.com.tw> +// zhengxunli <zhengxunli@mxic.com.tw> +// Boris Brezillon <boris.brezillon@bootlin.com> +// + +#include <linux/clk.h> +#include <linux/io.h> +#include <linux/iopoll.h> +#include <linux/module.h> +#include <linux/platform_device.h> +#include <linux/pm_runtime.h> +#include <linux/spi/spi.h> +#include <linux/spi/spi-mem.h> + +#define HC_CFG 0x0 +#define HC_CFG_IF_CFG(x) ((x) << 27) +#define HC_CFG_DUAL_SLAVE BIT(31) +#define HC_CFG_INDIVIDUAL BIT(30) +#define HC_CFG_NIO(x) (((x) / 4) << 27) +#define HC_CFG_TYPE(s, t) ((t) << (23 + ((s) * 2))) +#define HC_CFG_TYPE_SPI_NOR 0 +#define HC_CFG_TYPE_SPI_NAND 1 +#define HC_CFG_TYPE_SPI_RAM 2 +#define HC_CFG_TYPE_RAW_NAND 3 +#define HC_CFG_SLV_ACT(x) ((x) << 21) +#define HC_CFG_CLK_PH_EN BIT(20) +#define HC_CFG_CLK_POL_INV BIT(19) +#define HC_CFG_BIG_ENDIAN BIT(18) +#define HC_CFG_DATA_PASS BIT(17) +#define HC_CFG_IDLE_SIO_LVL(x) ((x) << 16) +#define HC_CFG_MAN_START_EN BIT(3) +#define HC_CFG_MAN_START BIT(2) +#define HC_CFG_MAN_CS_EN BIT(1) +#define HC_CFG_MAN_CS_ASSERT BIT(0) + +#define INT_STS 0x4 +#define INT_STS_EN 0x8 +#define INT_SIG_EN 0xc +#define INT_STS_ALL GENMASK(31, 0) +#define INT_RDY_PIN BIT(26) +#define INT_RDY_SR BIT(25) +#define INT_LNR_SUSP BIT(24) +#define INT_ECC_ERR BIT(17) +#define INT_CRC_ERR BIT(16) +#define INT_LWR_DIS BIT(12) +#define INT_LRD_DIS BIT(11) +#define INT_SDMA_INT BIT(10) +#define INT_DMA_FINISH BIT(9) +#define INT_RX_NOT_FULL BIT(3) +#define INT_RX_NOT_EMPTY BIT(2) +#define INT_TX_NOT_FULL BIT(1) +#define INT_TX_EMPTY BIT(0) + +#define HC_EN 0x10 +#define HC_EN_BIT BIT(0) + +#define TXD(x) (0x14 + ((x) * 4)) +#define RXD 0x24 + +#define SS_CTRL(s) (0x30 + ((s) * 4)) +#define LRD_CFG 0x44 +#define LWR_CFG 0x80 +#define RWW_CFG 0x70 +#define OP_READ BIT(23) +#define OP_DUMMY_CYC(x) ((x) << 17) +#define OP_ADDR_BYTES(x) ((x) << 14) +#define OP_CMD_BYTES(x) (((x) - 1) << 13) +#define OP_OCTA_CRC_EN BIT(12) +#define OP_DQS_EN BIT(11) +#define OP_ENHC_EN BIT(10) +#define OP_PREAMBLE_EN BIT(9) +#define OP_DATA_DDR BIT(8) +#define OP_DATA_BUSW(x) ((x) << 6) +#define OP_ADDR_DDR BIT(5) +#define OP_ADDR_BUSW(x) ((x) << 3) +#define OP_CMD_DDR BIT(2) +#define OP_CMD_BUSW(x) (x) +#define OP_BUSW_1 0 +#define OP_BUSW_2 1 +#define OP_BUSW_4 2 +#define OP_BUSW_8 3 + +#define OCTA_CRC 0x38 +#define OCTA_CRC_IN_EN(s) BIT(3 + ((s) * 16)) +#define OCTA_CRC_CHUNK(s, x) ((fls((x) / 32)) << (1 + ((s) * 16))) +#define OCTA_CRC_OUT_EN(s) BIT(0 + ((s) * 16)) + +#define ONFI_DIN_CNT(s) (0x3c + (s)) + +#define LRD_CTRL 0x48 +#define RWW_CTRL 0x74 +#define LWR_CTRL 0x84 +#define LMODE_EN BIT(31) +#define LMODE_SLV_ACT(x) ((x) << 21) +#define LMODE_CMD1(x) ((x) << 8) +#define LMODE_CMD0(x) (x) + +#define LRD_ADDR 0x4c +#define LWR_ADDR 0x88 +#define LRD_RANGE 0x50 +#define LWR_RANGE 0x8c + +#define AXI_SLV_ADDR 0x54 + +#define DMAC_RD_CFG 0x58 +#define DMAC_WR_CFG 0x94 +#define DMAC_CFG_PERIPH_EN BIT(31) +#define DMAC_CFG_ALLFLUSH_EN BIT(30) +#define DMAC_CFG_LASTFLUSH_EN BIT(29) +#define DMAC_CFG_QE(x) (((x) + 1) << 16) +#define DMAC_CFG_BURST_LEN(x) (((x) + 1) << 12) +#define DMAC_CFG_BURST_SZ(x) ((x) << 8) +#define DMAC_CFG_DIR_READ BIT(1) +#define DMAC_CFG_START BIT(0) + +#define DMAC_RD_CNT 0x5c +#define DMAC_WR_CNT 0x98 + +#define SDMA_ADDR 0x60 + +#define DMAM_CFG 0x64 +#define DMAM_CFG_START BIT(31) +#define DMAM_CFG_CONT BIT(30) +#define DMAM_CFG_SDMA_GAP(x) (fls((x) / 8192) << 2) +#define DMAM_CFG_DIR_READ BIT(1) +#define DMAM_CFG_EN BIT(0) + +#define DMAM_CNT 0x68 + +#define LNR_TIMER_TH 0x6c + +#define RDM_CFG0 0x78 +#define RDM_CFG0_POLY(x) (x) + +#define RDM_CFG1 0x7c +#define RDM_CFG1_RDM_EN BIT(31) +#define RDM_CFG1_SEED(x) (x) + +#define LWR_SUSP_CTRL 0x90 +#define LWR_SUSP_CTRL_EN BIT(31) + +#define DMAS_CTRL 0x9c +#define DMAS_CTRL_EN BIT(31) +#define DMAS_CTRL_DIR_READ BIT(30) + +#define DATA_STROB 0xa0 +#define DATA_STROB_EDO_EN BIT(2) +#define DATA_STROB_INV_POL BIT(1) +#define DATA_STROB_DELAY_2CYC BIT(0) + +#define IDLY_CODE(x) (0xa4 + ((x) * 4)) +#define IDLY_CODE_VAL(x, v) ((v) << (((x) % 4) * 8)) + +#define GPIO 0xc4 +#define GPIO_PT(x) BIT(3 + ((x) * 16)) +#define GPIO_RESET(x) BIT(2 + ((x) * 16)) +#define GPIO_HOLDB(x) BIT(1 + ((x) * 16)) +#define GPIO_WPB(x) BIT((x) * 16) + +#define HC_VER 0xd0 + +#define HW_TEST(x) (0xe0 + ((x) * 4)) + +struct mxic_spi { + struct clk *ps_clk; + struct clk *send_clk; + struct clk *send_dly_clk; + void __iomem *regs; + u32 cur_speed_hz; +}; + +static int mxic_spi_clk_enable(struct mxic_spi *mxic) +{ + int ret; + + ret = clk_prepare_enable(mxic->send_clk); + if (ret) + return ret; + + ret = clk_prepare_enable(mxic->send_dly_clk); + if (ret) + goto err_send_dly_clk; + + return ret; + +err_send_dly_clk: + clk_disable_unprepare(mxic->send_clk); + + return ret; +} + +static void mxic_spi_clk_disable(struct mxic_spi *mxic) +{ + clk_disable_unprepare(mxic->send_clk); + clk_disable_unprepare(mxic->send_dly_clk); +} + +static void mxic_spi_set_input_delay_dqs(struct mxic_spi *mxic, u8 idly_code) +{ + writel(IDLY_CODE_VAL(0, idly_code) | + IDLY_CODE_VAL(1, idly_code) | + IDLY_CODE_VAL(2, idly_code) | + IDLY_CODE_VAL(3, idly_code), + mxic->regs + IDLY_CODE(0)); + writel(IDLY_CODE_VAL(4, idly_code) | + IDLY_CODE_VAL(5, idly_code) | + IDLY_CODE_VAL(6, idly_code) | + IDLY_CODE_VAL(7, idly_code), + mxic->regs + IDLY_CODE(1)); +} + +static int mxic_spi_clk_setup(struct mxic_spi *mxic, unsigned long freq) +{ + int ret; + + ret = clk_set_rate(mxic->send_clk, freq); + if (ret) + return ret; + + ret = clk_set_rate(mxic->send_dly_clk, freq); + if (ret) + return ret; + + /* + * A constant delay range from 0x0 ~ 0x1F for input delay, + * the unit is 78 ps, the max input delay is 2.418 ns. + */ + mxic_spi_set_input_delay_dqs(mxic, 0xf); + + /* + * Phase degree = 360 * freq * output-delay + * where output-delay is a constant value 1 ns in FPGA. + * + * Get Phase degree = 360 * freq * 1 ns + * = 360 * freq * 1 sec / 1000000000 + * = 9 * freq / 25000000 + */ + ret = clk_set_phase(mxic->send_dly_clk, 9 * freq / 25000000); + if (ret) + return ret; + + return 0; +} + +static int mxic_spi_set_freq(struct mxic_spi *mxic, unsigned long freq) +{ + int ret; + + if (mxic->cur_speed_hz == freq) + return 0; + + mxic_spi_clk_disable(mxic); + ret = mxic_spi_clk_setup(mxic, freq); + if (ret) + return ret; + + ret = mxic_spi_clk_enable(mxic); + if (ret) + return ret; + + mxic->cur_speed_hz = freq; + + return 0; +} + +static void mxic_spi_hw_init(struct mxic_spi *mxic) +{ + writel(0, mxic->regs + DATA_STROB); + writel(INT_STS_ALL, mxic->regs + INT_STS_EN); + writel(0, mxic->regs + HC_EN); + writel(0, mxic->regs + LRD_CFG); + writel(0, mxic->regs + LRD_CTRL); + writel(HC_CFG_NIO(1) | HC_CFG_TYPE(0, HC_CFG_TYPE_SPI_NOR) | + HC_CFG_SLV_ACT(0) | HC_CFG_MAN_CS_EN | HC_CFG_IDLE_SIO_LVL(1), + mxic->regs + HC_CFG); +} + +static int mxic_spi_data_xfer(struct mxic_spi *mxic, const void *txbuf, + void *rxbuf, unsigned int len) +{ + unsigned int pos = 0; + + while (pos < len) { + unsigned int nbytes = len - pos; + u32 data = 0xffffffff; + u32 sts; + int ret; + + if (nbytes > 4) + nbytes = 4; + + if (txbuf) + memcpy(&data, txbuf + pos, nbytes); + + ret = readl_poll_timeout(mxic->regs + INT_STS, sts, + sts & INT_TX_EMPTY, 0, USEC_PER_SEC); + if (ret) + return ret; + + writel(data, mxic->regs + TXD(nbytes % 4)); + + ret = readl_poll_timeout(mxic->regs + INT_STS, sts, + sts & INT_TX_EMPTY, 0, USEC_PER_SEC); + if (ret) + return ret; + + ret = readl_poll_timeout(mxic->regs + INT_STS, sts, + sts & INT_RX_NOT_EMPTY, 0, + USEC_PER_SEC); + if (ret) + return ret; + + data = readl(mxic->regs + RXD); + if (rxbuf) { + data >>= (8 * (4 - nbytes)); + memcpy(rxbuf + pos, &data, nbytes); + } + WARN_ON(readl(mxic->regs + INT_STS) & INT_RX_NOT_EMPTY); + + pos += nbytes; + } + + return 0; +} + +static bool mxic_spi_mem_supports_op(struct spi_mem *mem, + const struct spi_mem_op *op) +{ + if (op->data.buswidth > 4 || op->addr.buswidth > 4 || + op->dummy.buswidth > 4 || op->cmd.buswidth > 4) + return false; + + if (op->data.nbytes && op->dummy.nbytes && + op->data.buswidth != op->dummy.buswidth) + return false; + + if (op->addr.nbytes > 7) + return false; + + return spi_mem_default_supports_op(mem, op); +} + +static int mxic_spi_mem_exec_op(struct spi_mem *mem, + const struct spi_mem_op *op) +{ + struct mxic_spi *mxic = spi_master_get_devdata(mem->spi->master); + int nio = 1, i, ret; + u32 ss_ctrl; + u8 addr[8]; + u8 opcode = op->cmd.opcode; + + ret = mxic_spi_set_freq(mxic, mem->spi->max_speed_hz); + if (ret) + return ret; + + if (mem->spi->mode & (SPI_TX_QUAD | SPI_RX_QUAD)) + nio = 4; + else if (mem->spi->mode & (SPI_TX_DUAL | SPI_RX_DUAL)) + nio = 2; + + writel(HC_CFG_NIO(nio) | + HC_CFG_TYPE(mem->spi->chip_select, HC_CFG_TYPE_SPI_NOR) | + HC_CFG_SLV_ACT(mem->spi->chip_select) | HC_CFG_IDLE_SIO_LVL(1) | + HC_CFG_MAN_CS_EN, + mxic->regs + HC_CFG); + writel(HC_EN_BIT, mxic->regs + HC_EN); + + ss_ctrl = OP_CMD_BYTES(1) | OP_CMD_BUSW(fls(op->cmd.buswidth) - 1); + + if (op->addr.nbytes) + ss_ctrl |= OP_ADDR_BYTES(op->addr.nbytes) | + OP_ADDR_BUSW(fls(op->addr.buswidth) - 1); + + if (op->dummy.nbytes) + ss_ctrl |= OP_DUMMY_CYC(op->dummy.nbytes); + + if (op->data.nbytes) { + ss_ctrl |= OP_DATA_BUSW(fls(op->data.buswidth) - 1); + if (op->data.dir == SPI_MEM_DATA_IN) + ss_ctrl |= OP_READ; + } + + writel(ss_ctrl, mxic->regs + SS_CTRL(mem->spi->chip_select)); + + writel(readl(mxic->regs + HC_CFG) | HC_CFG_MAN_CS_ASSERT, + mxic->regs + HC_CFG); + + ret = mxic_spi_data_xfer(mxic, &opcode, NULL, 1); + if (ret) + goto out; + + for (i = 0; i < op->addr.nbytes; i++) + addr[i] = op->addr.val >> (8 * (op->addr.nbytes - i - 1)); + + ret = mxic_spi_data_xfer(mxic, addr, NULL, op->addr.nbytes); + if (ret) + goto out; + + ret = mxic_spi_data_xfer(mxic, NULL, NULL, op->dummy.nbytes); + if (ret) + goto out; + + ret = mxic_spi_data_xfer(mxic, + op->data.dir == SPI_MEM_DATA_OUT ? + op->data.buf.out : NULL, + op->data.dir == SPI_MEM_DATA_IN ? + op->data.buf.in : NULL, + op->data.nbytes); + +out: + writel(readl(mxic->regs + HC_CFG) & ~HC_CFG_MAN_CS_ASSERT, + mxic->regs + HC_CFG); + writel(0, mxic->regs + HC_EN); + + return ret; +} + +static const struct spi_controller_mem_ops mxic_spi_mem_ops = { + .supports_op = mxic_spi_mem_supports_op, + .exec_op = mxic_spi_mem_exec_op, +}; + +static void mxic_spi_set_cs(struct spi_device *spi, bool lvl) +{ + struct mxic_spi *mxic = spi_master_get_devdata(spi->master); + + if (!lvl) { + writel(readl(mxic->regs + HC_CFG) | HC_CFG_MAN_CS_EN, + mxic->regs + HC_CFG); + writel(HC_EN_BIT, mxic->regs + HC_EN); + writel(readl(mxic->regs + HC_CFG) | HC_CFG_MAN_CS_ASSERT, + mxic->regs + HC_CFG); + } else { + writel(readl(mxic->regs + HC_CFG) & ~HC_CFG_MAN_CS_ASSERT, + mxic->regs + HC_CFG); + writel(0, mxic->regs + HC_EN); + } +} + +static int mxic_spi_transfer_one(struct spi_master *master, + struct spi_device *spi, + struct spi_transfer *t) +{ + struct mxic_spi *mxic = spi_master_get_devdata(master); + unsigned int busw = OP_BUSW_1; + int ret; + + if (t->rx_buf && t->tx_buf) { + if (((spi->mode & SPI_TX_QUAD) && + !(spi->mode & SPI_RX_QUAD)) || + ((spi->mode & SPI_TX_DUAL) && + !(spi->mode & SPI_RX_DUAL))) + return -ENOTSUPP; + } + + ret = mxic_spi_set_freq(mxic, t->speed_hz); + if (ret) + return ret; + + if (t->tx_buf) { + if (spi->mode & SPI_TX_QUAD) + busw = OP_BUSW_4; + else if (spi->mode & SPI_TX_DUAL) + busw = OP_BUSW_2; + } else if (t->rx_buf) { + if (spi->mode & SPI_RX_QUAD) + busw = OP_BUSW_4; + else if (spi->mode & SPI_RX_DUAL) + busw = OP_BUSW_2; + } + + writel(OP_CMD_BYTES(1) | OP_CMD_BUSW(busw) | + OP_DATA_BUSW(busw) | (t->rx_buf ? OP_READ : 0), + mxic->regs + SS_CTRL(0)); + + ret = mxic_spi_data_xfer(mxic, t->tx_buf, t->rx_buf, t->len); + if (ret) + return ret; + + spi_finalize_current_transfer(master); + + return 0; +} + +static int __maybe_unused mxic_spi_runtime_suspend(struct device *dev) +{ + struct spi_master *master = dev_get_drvdata(dev); + struct mxic_spi *mxic = spi_master_get_devdata(master); + + mxic_spi_clk_disable(mxic); + clk_disable_unprepare(mxic->ps_clk); + + return 0; +} + +static int __maybe_unused mxic_spi_runtime_resume(struct device *dev) +{ + struct spi_master *master = dev_get_drvdata(dev); + struct mxic_spi *mxic = spi_master_get_devdata(master); + int ret; + + ret = clk_prepare_enable(mxic->ps_clk); + if (ret) { + dev_err(dev, "Cannot enable ps_clock.\n"); + return ret; + } + + return mxic_spi_clk_enable(mxic); +} + +static const struct dev_pm_ops mxic_spi_dev_pm_ops = { + SET_RUNTIME_PM_OPS(mxic_spi_runtime_suspend, + mxic_spi_runtime_resume, NULL) +}; + +static int mxic_spi_probe(struct platform_device *pdev) +{ + struct spi_master *master; + struct resource *res; + struct mxic_spi *mxic; + int ret; + + master = devm_spi_alloc_master(&pdev->dev, sizeof(struct mxic_spi)); + if (!master) + return -ENOMEM; + + platform_set_drvdata(pdev, master); + + mxic = spi_master_get_devdata(master); + + master->dev.of_node = pdev->dev.of_node; + + mxic->ps_clk = devm_clk_get(&pdev->dev, "ps_clk"); + if (IS_ERR(mxic->ps_clk)) + return PTR_ERR(mxic->ps_clk); + + mxic->send_clk = devm_clk_get(&pdev->dev, "send_clk"); + if (IS_ERR(mxic->send_clk)) + return PTR_ERR(mxic->send_clk); + + mxic->send_dly_clk = devm_clk_get(&pdev->dev, "send_dly_clk"); + if (IS_ERR(mxic->send_dly_clk)) + return PTR_ERR(mxic->send_dly_clk); + + res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "regs"); + mxic->regs = devm_ioremap_resource(&pdev->dev, res); + if (IS_ERR(mxic->regs)) + return PTR_ERR(mxic->regs); + + pm_runtime_enable(&pdev->dev); + master->auto_runtime_pm = true; + + master->num_chipselect = 1; + master->mem_ops = &mxic_spi_mem_ops; + + master->set_cs = mxic_spi_set_cs; + master->transfer_one = mxic_spi_transfer_one; + master->bits_per_word_mask = SPI_BPW_MASK(8); + master->mode_bits = SPI_CPOL | SPI_CPHA | + SPI_RX_DUAL | SPI_TX_DUAL | + SPI_RX_QUAD | SPI_TX_QUAD; + + mxic_spi_hw_init(mxic); + + ret = spi_register_master(master); + if (ret) { + dev_err(&pdev->dev, "spi_register_master failed\n"); + pm_runtime_disable(&pdev->dev); + } + + return ret; +} + +static int mxic_spi_remove(struct platform_device *pdev) +{ + struct spi_master *master = platform_get_drvdata(pdev); + + pm_runtime_disable(&pdev->dev); + spi_unregister_master(master); + + return 0; +} + +static const struct of_device_id mxic_spi_of_ids[] = { + { .compatible = "mxicy,mx25f0a-spi", }, + { /* sentinel */ } +}; +MODULE_DEVICE_TABLE(of, mxic_spi_of_ids); + +static struct platform_driver mxic_spi_driver = { + .probe = mxic_spi_probe, + .remove = mxic_spi_remove, + .driver = { + .name = "mxic-spi", + .of_match_table = mxic_spi_of_ids, + .pm = &mxic_spi_dev_pm_ops, + }, +}; +module_platform_driver(mxic_spi_driver); + +MODULE_AUTHOR("Mason Yang <masonccyang@mxic.com.tw>"); +MODULE_DESCRIPTION("MX25F0A SPI controller driver"); +MODULE_LICENSE("GPL v2"); diff --git a/drivers/spi/spi-mxs.c b/drivers/spi/spi-mxs.c new file mode 100644 index 000000000..435309b09 --- /dev/null +++ b/drivers/spi/spi-mxs.c @@ -0,0 +1,676 @@ +// SPDX-License-Identifier: GPL-2.0+ +// +// Freescale MXS SPI master driver +// +// Copyright 2012 DENX Software Engineering, GmbH. +// Copyright 2012 Freescale Semiconductor, Inc. +// Copyright 2008 Embedded Alley Solutions, Inc All Rights Reserved. +// +// Rework and transition to new API by: +// Marek Vasut <marex@denx.de> +// +// Based on previous attempt by: +// Fabio Estevam <fabio.estevam@freescale.com> +// +// Based on code from U-Boot bootloader by: +// Marek Vasut <marex@denx.de> +// +// Based on spi-stmp.c, which is: +// Author: Dmitry Pervushin <dimka@embeddedalley.com> + +#include <linux/kernel.h> +#include <linux/ioport.h> +#include <linux/of.h> +#include <linux/of_device.h> +#include <linux/platform_device.h> +#include <linux/delay.h> +#include <linux/interrupt.h> +#include <linux/dma-mapping.h> +#include <linux/dmaengine.h> +#include <linux/highmem.h> +#include <linux/clk.h> +#include <linux/err.h> +#include <linux/completion.h> +#include <linux/pinctrl/consumer.h> +#include <linux/regulator/consumer.h> +#include <linux/pm_runtime.h> +#include <linux/module.h> +#include <linux/stmp_device.h> +#include <linux/spi/spi.h> +#include <linux/spi/mxs-spi.h> +#include <trace/events/spi.h> + +#define DRIVER_NAME "mxs-spi" + +/* Use 10S timeout for very long transfers, it should suffice. */ +#define SSP_TIMEOUT 10000 + +#define SG_MAXLEN 0xff00 + +/* + * Flags for txrx functions. More efficient that using an argument register for + * each one. + */ +#define TXRX_WRITE (1<<0) /* This is a write */ +#define TXRX_DEASSERT_CS (1<<1) /* De-assert CS at end of txrx */ + +struct mxs_spi { + struct mxs_ssp ssp; + struct completion c; + unsigned int sck; /* Rate requested (vs actual) */ +}; + +static int mxs_spi_setup_transfer(struct spi_device *dev, + const struct spi_transfer *t) +{ + struct mxs_spi *spi = spi_master_get_devdata(dev->master); + struct mxs_ssp *ssp = &spi->ssp; + const unsigned int hz = min(dev->max_speed_hz, t->speed_hz); + + if (hz == 0) { + dev_err(&dev->dev, "SPI clock rate of zero not allowed\n"); + return -EINVAL; + } + + if (hz != spi->sck) { + mxs_ssp_set_clk_rate(ssp, hz); + /* + * Save requested rate, hz, rather than the actual rate, + * ssp->clk_rate. Otherwise we would set the rate every transfer + * when the actual rate is not quite the same as requested rate. + */ + spi->sck = hz; + /* + * Perhaps we should return an error if the actual clock is + * nowhere close to what was requested? + */ + } + + writel(BM_SSP_CTRL0_LOCK_CS, + ssp->base + HW_SSP_CTRL0 + STMP_OFFSET_REG_SET); + + writel(BF_SSP_CTRL1_SSP_MODE(BV_SSP_CTRL1_SSP_MODE__SPI) | + BF_SSP_CTRL1_WORD_LENGTH(BV_SSP_CTRL1_WORD_LENGTH__EIGHT_BITS) | + ((dev->mode & SPI_CPOL) ? BM_SSP_CTRL1_POLARITY : 0) | + ((dev->mode & SPI_CPHA) ? BM_SSP_CTRL1_PHASE : 0), + ssp->base + HW_SSP_CTRL1(ssp)); + + writel(0x0, ssp->base + HW_SSP_CMD0); + writel(0x0, ssp->base + HW_SSP_CMD1); + + return 0; +} + +static u32 mxs_spi_cs_to_reg(unsigned cs) +{ + u32 select = 0; + + /* + * i.MX28 Datasheet: 17.10.1: HW_SSP_CTRL0 + * + * The bits BM_SSP_CTRL0_WAIT_FOR_CMD and BM_SSP_CTRL0_WAIT_FOR_IRQ + * in HW_SSP_CTRL0 register do have multiple usage, please refer to + * the datasheet for further details. In SPI mode, they are used to + * toggle the chip-select lines (nCS pins). + */ + if (cs & 1) + select |= BM_SSP_CTRL0_WAIT_FOR_CMD; + if (cs & 2) + select |= BM_SSP_CTRL0_WAIT_FOR_IRQ; + + return select; +} + +static int mxs_ssp_wait(struct mxs_spi *spi, int offset, int mask, bool set) +{ + const unsigned long timeout = jiffies + msecs_to_jiffies(SSP_TIMEOUT); + struct mxs_ssp *ssp = &spi->ssp; + u32 reg; + + do { + reg = readl_relaxed(ssp->base + offset); + + if (!set) + reg = ~reg; + + reg &= mask; + + if (reg == mask) + return 0; + } while (time_before(jiffies, timeout)); + + return -ETIMEDOUT; +} + +static void mxs_ssp_dma_irq_callback(void *param) +{ + struct mxs_spi *spi = param; + + complete(&spi->c); +} + +static irqreturn_t mxs_ssp_irq_handler(int irq, void *dev_id) +{ + struct mxs_ssp *ssp = dev_id; + + dev_err(ssp->dev, "%s[%i] CTRL1=%08x STATUS=%08x\n", + __func__, __LINE__, + readl(ssp->base + HW_SSP_CTRL1(ssp)), + readl(ssp->base + HW_SSP_STATUS(ssp))); + return IRQ_HANDLED; +} + +static int mxs_spi_txrx_dma(struct mxs_spi *spi, + unsigned char *buf, int len, + unsigned int flags) +{ + struct mxs_ssp *ssp = &spi->ssp; + struct dma_async_tx_descriptor *desc = NULL; + const bool vmalloced_buf = is_vmalloc_addr(buf); + const int desc_len = vmalloced_buf ? PAGE_SIZE : SG_MAXLEN; + const int sgs = DIV_ROUND_UP(len, desc_len); + int sg_count; + int min, ret; + u32 ctrl0; + struct page *vm_page; + struct { + u32 pio[4]; + struct scatterlist sg; + } *dma_xfer; + + if (!len) + return -EINVAL; + + dma_xfer = kcalloc(sgs, sizeof(*dma_xfer), GFP_KERNEL); + if (!dma_xfer) + return -ENOMEM; + + reinit_completion(&spi->c); + + /* Chip select was already programmed into CTRL0 */ + ctrl0 = readl(ssp->base + HW_SSP_CTRL0); + ctrl0 &= ~(BM_SSP_CTRL0_XFER_COUNT | BM_SSP_CTRL0_IGNORE_CRC | + BM_SSP_CTRL0_READ); + ctrl0 |= BM_SSP_CTRL0_DATA_XFER; + + if (!(flags & TXRX_WRITE)) + ctrl0 |= BM_SSP_CTRL0_READ; + + /* Queue the DMA data transfer. */ + for (sg_count = 0; sg_count < sgs; sg_count++) { + /* Prepare the transfer descriptor. */ + min = min(len, desc_len); + + /* + * De-assert CS on last segment if flag is set (i.e., no more + * transfers will follow) + */ + if ((sg_count + 1 == sgs) && (flags & TXRX_DEASSERT_CS)) + ctrl0 |= BM_SSP_CTRL0_IGNORE_CRC; + + if (ssp->devid == IMX23_SSP) { + ctrl0 &= ~BM_SSP_CTRL0_XFER_COUNT; + ctrl0 |= min; + } + + dma_xfer[sg_count].pio[0] = ctrl0; + dma_xfer[sg_count].pio[3] = min; + + if (vmalloced_buf) { + vm_page = vmalloc_to_page(buf); + if (!vm_page) { + ret = -ENOMEM; + goto err_vmalloc; + } + + sg_init_table(&dma_xfer[sg_count].sg, 1); + sg_set_page(&dma_xfer[sg_count].sg, vm_page, + min, offset_in_page(buf)); + } else { + sg_init_one(&dma_xfer[sg_count].sg, buf, min); + } + + ret = dma_map_sg(ssp->dev, &dma_xfer[sg_count].sg, 1, + (flags & TXRX_WRITE) ? DMA_TO_DEVICE : DMA_FROM_DEVICE); + + len -= min; + buf += min; + + /* Queue the PIO register write transfer. */ + desc = dmaengine_prep_slave_sg(ssp->dmach, + (struct scatterlist *)dma_xfer[sg_count].pio, + (ssp->devid == IMX23_SSP) ? 1 : 4, + DMA_TRANS_NONE, + sg_count ? DMA_PREP_INTERRUPT : 0); + if (!desc) { + dev_err(ssp->dev, + "Failed to get PIO reg. write descriptor.\n"); + ret = -EINVAL; + goto err_mapped; + } + + desc = dmaengine_prep_slave_sg(ssp->dmach, + &dma_xfer[sg_count].sg, 1, + (flags & TXRX_WRITE) ? DMA_MEM_TO_DEV : DMA_DEV_TO_MEM, + DMA_PREP_INTERRUPT | DMA_CTRL_ACK); + + if (!desc) { + dev_err(ssp->dev, + "Failed to get DMA data write descriptor.\n"); + ret = -EINVAL; + goto err_mapped; + } + } + + /* + * The last descriptor must have this callback, + * to finish the DMA transaction. + */ + desc->callback = mxs_ssp_dma_irq_callback; + desc->callback_param = spi; + + /* Start the transfer. */ + dmaengine_submit(desc); + dma_async_issue_pending(ssp->dmach); + + if (!wait_for_completion_timeout(&spi->c, + msecs_to_jiffies(SSP_TIMEOUT))) { + dev_err(ssp->dev, "DMA transfer timeout\n"); + ret = -ETIMEDOUT; + dmaengine_terminate_all(ssp->dmach); + goto err_vmalloc; + } + + ret = 0; + +err_vmalloc: + while (--sg_count >= 0) { +err_mapped: + dma_unmap_sg(ssp->dev, &dma_xfer[sg_count].sg, 1, + (flags & TXRX_WRITE) ? DMA_TO_DEVICE : DMA_FROM_DEVICE); + } + + kfree(dma_xfer); + + return ret; +} + +static int mxs_spi_txrx_pio(struct mxs_spi *spi, + unsigned char *buf, int len, + unsigned int flags) +{ + struct mxs_ssp *ssp = &spi->ssp; + + writel(BM_SSP_CTRL0_IGNORE_CRC, + ssp->base + HW_SSP_CTRL0 + STMP_OFFSET_REG_CLR); + + while (len--) { + if (len == 0 && (flags & TXRX_DEASSERT_CS)) + writel(BM_SSP_CTRL0_IGNORE_CRC, + ssp->base + HW_SSP_CTRL0 + STMP_OFFSET_REG_SET); + + if (ssp->devid == IMX23_SSP) { + writel(BM_SSP_CTRL0_XFER_COUNT, + ssp->base + HW_SSP_CTRL0 + STMP_OFFSET_REG_CLR); + writel(1, + ssp->base + HW_SSP_CTRL0 + STMP_OFFSET_REG_SET); + } else { + writel(1, ssp->base + HW_SSP_XFER_SIZE); + } + + if (flags & TXRX_WRITE) + writel(BM_SSP_CTRL0_READ, + ssp->base + HW_SSP_CTRL0 + STMP_OFFSET_REG_CLR); + else + writel(BM_SSP_CTRL0_READ, + ssp->base + HW_SSP_CTRL0 + STMP_OFFSET_REG_SET); + + writel(BM_SSP_CTRL0_RUN, + ssp->base + HW_SSP_CTRL0 + STMP_OFFSET_REG_SET); + + if (mxs_ssp_wait(spi, HW_SSP_CTRL0, BM_SSP_CTRL0_RUN, 1)) + return -ETIMEDOUT; + + if (flags & TXRX_WRITE) + writel(*buf, ssp->base + HW_SSP_DATA(ssp)); + + writel(BM_SSP_CTRL0_DATA_XFER, + ssp->base + HW_SSP_CTRL0 + STMP_OFFSET_REG_SET); + + if (!(flags & TXRX_WRITE)) { + if (mxs_ssp_wait(spi, HW_SSP_STATUS(ssp), + BM_SSP_STATUS_FIFO_EMPTY, 0)) + return -ETIMEDOUT; + + *buf = (readl(ssp->base + HW_SSP_DATA(ssp)) & 0xff); + } + + if (mxs_ssp_wait(spi, HW_SSP_CTRL0, BM_SSP_CTRL0_RUN, 0)) + return -ETIMEDOUT; + + buf++; + } + + if (len <= 0) + return 0; + + return -ETIMEDOUT; +} + +static int mxs_spi_transfer_one(struct spi_master *master, + struct spi_message *m) +{ + struct mxs_spi *spi = spi_master_get_devdata(master); + struct mxs_ssp *ssp = &spi->ssp; + struct spi_transfer *t; + unsigned int flag; + int status = 0; + + /* Program CS register bits here, it will be used for all transfers. */ + writel(BM_SSP_CTRL0_WAIT_FOR_CMD | BM_SSP_CTRL0_WAIT_FOR_IRQ, + ssp->base + HW_SSP_CTRL0 + STMP_OFFSET_REG_CLR); + writel(mxs_spi_cs_to_reg(m->spi->chip_select), + ssp->base + HW_SSP_CTRL0 + STMP_OFFSET_REG_SET); + + list_for_each_entry(t, &m->transfers, transfer_list) { + + trace_spi_transfer_start(m, t); + + status = mxs_spi_setup_transfer(m->spi, t); + if (status) + break; + + /* De-assert on last transfer, inverted by cs_change flag */ + flag = (&t->transfer_list == m->transfers.prev) ^ t->cs_change ? + TXRX_DEASSERT_CS : 0; + + /* + * Small blocks can be transfered via PIO. + * Measured by empiric means: + * + * dd if=/dev/mtdblock0 of=/dev/null bs=1024k count=1 + * + * DMA only: 2.164808 seconds, 473.0KB/s + * Combined: 1.676276 seconds, 610.9KB/s + */ + if (t->len < 32) { + writel(BM_SSP_CTRL1_DMA_ENABLE, + ssp->base + HW_SSP_CTRL1(ssp) + + STMP_OFFSET_REG_CLR); + + if (t->tx_buf) + status = mxs_spi_txrx_pio(spi, + (void *)t->tx_buf, + t->len, flag | TXRX_WRITE); + if (t->rx_buf) + status = mxs_spi_txrx_pio(spi, + t->rx_buf, t->len, + flag); + } else { + writel(BM_SSP_CTRL1_DMA_ENABLE, + ssp->base + HW_SSP_CTRL1(ssp) + + STMP_OFFSET_REG_SET); + + if (t->tx_buf) + status = mxs_spi_txrx_dma(spi, + (void *)t->tx_buf, t->len, + flag | TXRX_WRITE); + if (t->rx_buf) + status = mxs_spi_txrx_dma(spi, + t->rx_buf, t->len, + flag); + } + + trace_spi_transfer_stop(m, t); + + if (status) { + stmp_reset_block(ssp->base); + break; + } + + m->actual_length += t->len; + } + + m->status = status; + spi_finalize_current_message(master); + + return status; +} + +static int mxs_spi_runtime_suspend(struct device *dev) +{ + struct spi_master *master = dev_get_drvdata(dev); + struct mxs_spi *spi = spi_master_get_devdata(master); + struct mxs_ssp *ssp = &spi->ssp; + int ret; + + clk_disable_unprepare(ssp->clk); + + ret = pinctrl_pm_select_idle_state(dev); + if (ret) { + int ret2 = clk_prepare_enable(ssp->clk); + + if (ret2) + dev_warn(dev, "Failed to reenable clock after failing pinctrl request (pinctrl: %d, clk: %d)\n", + ret, ret2); + } + + return ret; +} + +static int mxs_spi_runtime_resume(struct device *dev) +{ + struct spi_master *master = dev_get_drvdata(dev); + struct mxs_spi *spi = spi_master_get_devdata(master); + struct mxs_ssp *ssp = &spi->ssp; + int ret; + + ret = pinctrl_pm_select_default_state(dev); + if (ret) + return ret; + + ret = clk_prepare_enable(ssp->clk); + if (ret) + pinctrl_pm_select_idle_state(dev); + + return ret; +} + +static int __maybe_unused mxs_spi_suspend(struct device *dev) +{ + struct spi_master *master = dev_get_drvdata(dev); + int ret; + + ret = spi_master_suspend(master); + if (ret) + return ret; + + if (!pm_runtime_suspended(dev)) + return mxs_spi_runtime_suspend(dev); + else + return 0; +} + +static int __maybe_unused mxs_spi_resume(struct device *dev) +{ + struct spi_master *master = dev_get_drvdata(dev); + int ret; + + if (!pm_runtime_suspended(dev)) + ret = mxs_spi_runtime_resume(dev); + else + ret = 0; + if (ret) + return ret; + + ret = spi_master_resume(master); + if (ret < 0 && !pm_runtime_suspended(dev)) + mxs_spi_runtime_suspend(dev); + + return ret; +} + +static const struct dev_pm_ops mxs_spi_pm = { + SET_RUNTIME_PM_OPS(mxs_spi_runtime_suspend, + mxs_spi_runtime_resume, NULL) + SET_SYSTEM_SLEEP_PM_OPS(mxs_spi_suspend, mxs_spi_resume) +}; + +static const struct of_device_id mxs_spi_dt_ids[] = { + { .compatible = "fsl,imx23-spi", .data = (void *) IMX23_SSP, }, + { .compatible = "fsl,imx28-spi", .data = (void *) IMX28_SSP, }, + { /* sentinel */ } +}; +MODULE_DEVICE_TABLE(of, mxs_spi_dt_ids); + +static int mxs_spi_probe(struct platform_device *pdev) +{ + const struct of_device_id *of_id = + of_match_device(mxs_spi_dt_ids, &pdev->dev); + struct device_node *np = pdev->dev.of_node; + struct spi_master *master; + struct mxs_spi *spi; + struct mxs_ssp *ssp; + struct clk *clk; + void __iomem *base; + int devid, clk_freq; + int ret = 0, irq_err; + + /* + * Default clock speed for the SPI core. 160MHz seems to + * work reasonably well with most SPI flashes, so use this + * as a default. Override with "clock-frequency" DT prop. + */ + const int clk_freq_default = 160000000; + + irq_err = platform_get_irq(pdev, 0); + if (irq_err < 0) + return irq_err; + + base = devm_platform_ioremap_resource(pdev, 0); + if (IS_ERR(base)) + return PTR_ERR(base); + + clk = devm_clk_get(&pdev->dev, NULL); + if (IS_ERR(clk)) + return PTR_ERR(clk); + + devid = (enum mxs_ssp_id) of_id->data; + ret = of_property_read_u32(np, "clock-frequency", + &clk_freq); + if (ret) + clk_freq = clk_freq_default; + + master = spi_alloc_master(&pdev->dev, sizeof(*spi)); + if (!master) + return -ENOMEM; + + platform_set_drvdata(pdev, master); + + master->transfer_one_message = mxs_spi_transfer_one; + master->bits_per_word_mask = SPI_BPW_MASK(8); + master->mode_bits = SPI_CPOL | SPI_CPHA; + master->num_chipselect = 3; + master->dev.of_node = np; + master->flags = SPI_MASTER_HALF_DUPLEX; + master->auto_runtime_pm = true; + + spi = spi_master_get_devdata(master); + ssp = &spi->ssp; + ssp->dev = &pdev->dev; + ssp->clk = clk; + ssp->base = base; + ssp->devid = devid; + + init_completion(&spi->c); + + ret = devm_request_irq(&pdev->dev, irq_err, mxs_ssp_irq_handler, 0, + dev_name(&pdev->dev), ssp); + if (ret) + goto out_master_free; + + ssp->dmach = dma_request_chan(&pdev->dev, "rx-tx"); + if (IS_ERR(ssp->dmach)) { + dev_err(ssp->dev, "Failed to request DMA\n"); + ret = PTR_ERR(ssp->dmach); + goto out_master_free; + } + + pm_runtime_enable(ssp->dev); + if (!pm_runtime_enabled(ssp->dev)) { + ret = mxs_spi_runtime_resume(ssp->dev); + if (ret < 0) { + dev_err(ssp->dev, "runtime resume failed\n"); + goto out_dma_release; + } + } + + ret = pm_runtime_get_sync(ssp->dev); + if (ret < 0) { + pm_runtime_put_noidle(ssp->dev); + dev_err(ssp->dev, "runtime_get_sync failed\n"); + goto out_pm_runtime_disable; + } + + clk_set_rate(ssp->clk, clk_freq); + + ret = stmp_reset_block(ssp->base); + if (ret) + goto out_pm_runtime_put; + + ret = devm_spi_register_master(&pdev->dev, master); + if (ret) { + dev_err(&pdev->dev, "Cannot register SPI master, %d\n", ret); + goto out_pm_runtime_put; + } + + pm_runtime_put(ssp->dev); + + return 0; + +out_pm_runtime_put: + pm_runtime_put(ssp->dev); +out_pm_runtime_disable: + pm_runtime_disable(ssp->dev); +out_dma_release: + dma_release_channel(ssp->dmach); +out_master_free: + spi_master_put(master); + return ret; +} + +static int mxs_spi_remove(struct platform_device *pdev) +{ + struct spi_master *master; + struct mxs_spi *spi; + struct mxs_ssp *ssp; + + master = platform_get_drvdata(pdev); + spi = spi_master_get_devdata(master); + ssp = &spi->ssp; + + pm_runtime_disable(&pdev->dev); + if (!pm_runtime_status_suspended(&pdev->dev)) + mxs_spi_runtime_suspend(&pdev->dev); + + dma_release_channel(ssp->dmach); + + return 0; +} + +static struct platform_driver mxs_spi_driver = { + .probe = mxs_spi_probe, + .remove = mxs_spi_remove, + .driver = { + .name = DRIVER_NAME, + .of_match_table = mxs_spi_dt_ids, + .pm = &mxs_spi_pm, + }, +}; + +module_platform_driver(mxs_spi_driver); + +MODULE_AUTHOR("Marek Vasut <marex@denx.de>"); +MODULE_DESCRIPTION("MXS SPI master driver"); +MODULE_LICENSE("GPL"); +MODULE_ALIAS("platform:mxs-spi"); diff --git a/drivers/spi/spi-npcm-fiu.c b/drivers/spi/spi-npcm-fiu.c new file mode 100644 index 000000000..1edaf22e2 --- /dev/null +++ b/drivers/spi/spi-npcm-fiu.c @@ -0,0 +1,769 @@ +// SPDX-License-Identifier: GPL-2.0 +// Copyright (c) 2019 Nuvoton Technology corporation. + +#include <linux/bits.h> +#include <linux/init.h> +#include <linux/kernel.h> +#include <linux/device.h> +#include <linux/module.h> +#include <linux/ioport.h> +#include <linux/clk.h> +#include <linux/platform_device.h> +#include <linux/io.h> +#include <linux/vmalloc.h> +#include <linux/regmap.h> +#include <linux/of_device.h> +#include <linux/spi/spi-mem.h> +#include <linux/mfd/syscon.h> + +/* NPCM7xx GCR module */ +#define NPCM7XX_INTCR3_OFFSET 0x9C +#define NPCM7XX_INTCR3_FIU_FIX BIT(6) + +/* Flash Interface Unit (FIU) Registers */ +#define NPCM_FIU_DRD_CFG 0x00 +#define NPCM_FIU_DWR_CFG 0x04 +#define NPCM_FIU_UMA_CFG 0x08 +#define NPCM_FIU_UMA_CTS 0x0C +#define NPCM_FIU_UMA_CMD 0x10 +#define NPCM_FIU_UMA_ADDR 0x14 +#define NPCM_FIU_PRT_CFG 0x18 +#define NPCM_FIU_UMA_DW0 0x20 +#define NPCM_FIU_UMA_DW1 0x24 +#define NPCM_FIU_UMA_DW2 0x28 +#define NPCM_FIU_UMA_DW3 0x2C +#define NPCM_FIU_UMA_DR0 0x30 +#define NPCM_FIU_UMA_DR1 0x34 +#define NPCM_FIU_UMA_DR2 0x38 +#define NPCM_FIU_UMA_DR3 0x3C +#define NPCM_FIU_MAX_REG_LIMIT 0x80 + +/* FIU Direct Read Configuration Register */ +#define NPCM_FIU_DRD_CFG_LCK BIT(31) +#define NPCM_FIU_DRD_CFG_R_BURST GENMASK(25, 24) +#define NPCM_FIU_DRD_CFG_ADDSIZ GENMASK(17, 16) +#define NPCM_FIU_DRD_CFG_DBW GENMASK(13, 12) +#define NPCM_FIU_DRD_CFG_ACCTYPE GENMASK(9, 8) +#define NPCM_FIU_DRD_CFG_RDCMD GENMASK(7, 0) +#define NPCM_FIU_DRD_ADDSIZ_SHIFT 16 +#define NPCM_FIU_DRD_DBW_SHIFT 12 +#define NPCM_FIU_DRD_ACCTYPE_SHIFT 8 + +/* FIU Direct Write Configuration Register */ +#define NPCM_FIU_DWR_CFG_LCK BIT(31) +#define NPCM_FIU_DWR_CFG_W_BURST GENMASK(25, 24) +#define NPCM_FIU_DWR_CFG_ADDSIZ GENMASK(17, 16) +#define NPCM_FIU_DWR_CFG_ABPCK GENMASK(11, 10) +#define NPCM_FIU_DWR_CFG_DBPCK GENMASK(9, 8) +#define NPCM_FIU_DWR_CFG_WRCMD GENMASK(7, 0) +#define NPCM_FIU_DWR_ADDSIZ_SHIFT 16 +#define NPCM_FIU_DWR_ABPCK_SHIFT 10 +#define NPCM_FIU_DWR_DBPCK_SHIFT 8 + +/* FIU UMA Configuration Register */ +#define NPCM_FIU_UMA_CFG_LCK BIT(31) +#define NPCM_FIU_UMA_CFG_CMMLCK BIT(30) +#define NPCM_FIU_UMA_CFG_RDATSIZ GENMASK(28, 24) +#define NPCM_FIU_UMA_CFG_DBSIZ GENMASK(23, 21) +#define NPCM_FIU_UMA_CFG_WDATSIZ GENMASK(20, 16) +#define NPCM_FIU_UMA_CFG_ADDSIZ GENMASK(13, 11) +#define NPCM_FIU_UMA_CFG_CMDSIZ BIT(10) +#define NPCM_FIU_UMA_CFG_RDBPCK GENMASK(9, 8) +#define NPCM_FIU_UMA_CFG_DBPCK GENMASK(7, 6) +#define NPCM_FIU_UMA_CFG_WDBPCK GENMASK(5, 4) +#define NPCM_FIU_UMA_CFG_ADBPCK GENMASK(3, 2) +#define NPCM_FIU_UMA_CFG_CMBPCK GENMASK(1, 0) +#define NPCM_FIU_UMA_CFG_ADBPCK_SHIFT 2 +#define NPCM_FIU_UMA_CFG_WDBPCK_SHIFT 4 +#define NPCM_FIU_UMA_CFG_DBPCK_SHIFT 6 +#define NPCM_FIU_UMA_CFG_RDBPCK_SHIFT 8 +#define NPCM_FIU_UMA_CFG_ADDSIZ_SHIFT 11 +#define NPCM_FIU_UMA_CFG_WDATSIZ_SHIFT 16 +#define NPCM_FIU_UMA_CFG_DBSIZ_SHIFT 21 +#define NPCM_FIU_UMA_CFG_RDATSIZ_SHIFT 24 + +/* FIU UMA Control and Status Register */ +#define NPCM_FIU_UMA_CTS_RDYIE BIT(25) +#define NPCM_FIU_UMA_CTS_RDYST BIT(24) +#define NPCM_FIU_UMA_CTS_SW_CS BIT(16) +#define NPCM_FIU_UMA_CTS_DEV_NUM GENMASK(9, 8) +#define NPCM_FIU_UMA_CTS_EXEC_DONE BIT(0) +#define NPCM_FIU_UMA_CTS_DEV_NUM_SHIFT 8 + +/* FIU UMA Command Register */ +#define NPCM_FIU_UMA_CMD_DUM3 GENMASK(31, 24) +#define NPCM_FIU_UMA_CMD_DUM2 GENMASK(23, 16) +#define NPCM_FIU_UMA_CMD_DUM1 GENMASK(15, 8) +#define NPCM_FIU_UMA_CMD_CMD GENMASK(7, 0) + +/* FIU UMA Address Register */ +#define NPCM_FIU_UMA_ADDR_UMA_ADDR GENMASK(31, 0) +#define NPCM_FIU_UMA_ADDR_AB3 GENMASK(31, 24) +#define NPCM_FIU_UMA_ADDR_AB2 GENMASK(23, 16) +#define NPCM_FIU_UMA_ADDR_AB1 GENMASK(15, 8) +#define NPCM_FIU_UMA_ADDR_AB0 GENMASK(7, 0) + +/* FIU UMA Write Data Bytes 0-3 Register */ +#define NPCM_FIU_UMA_DW0_WB3 GENMASK(31, 24) +#define NPCM_FIU_UMA_DW0_WB2 GENMASK(23, 16) +#define NPCM_FIU_UMA_DW0_WB1 GENMASK(15, 8) +#define NPCM_FIU_UMA_DW0_WB0 GENMASK(7, 0) + +/* FIU UMA Write Data Bytes 4-7 Register */ +#define NPCM_FIU_UMA_DW1_WB7 GENMASK(31, 24) +#define NPCM_FIU_UMA_DW1_WB6 GENMASK(23, 16) +#define NPCM_FIU_UMA_DW1_WB5 GENMASK(15, 8) +#define NPCM_FIU_UMA_DW1_WB4 GENMASK(7, 0) + +/* FIU UMA Write Data Bytes 8-11 Register */ +#define NPCM_FIU_UMA_DW2_WB11 GENMASK(31, 24) +#define NPCM_FIU_UMA_DW2_WB10 GENMASK(23, 16) +#define NPCM_FIU_UMA_DW2_WB9 GENMASK(15, 8) +#define NPCM_FIU_UMA_DW2_WB8 GENMASK(7, 0) + +/* FIU UMA Write Data Bytes 12-15 Register */ +#define NPCM_FIU_UMA_DW3_WB15 GENMASK(31, 24) +#define NPCM_FIU_UMA_DW3_WB14 GENMASK(23, 16) +#define NPCM_FIU_UMA_DW3_WB13 GENMASK(15, 8) +#define NPCM_FIU_UMA_DW3_WB12 GENMASK(7, 0) + +/* FIU UMA Read Data Bytes 0-3 Register */ +#define NPCM_FIU_UMA_DR0_RB3 GENMASK(31, 24) +#define NPCM_FIU_UMA_DR0_RB2 GENMASK(23, 16) +#define NPCM_FIU_UMA_DR0_RB1 GENMASK(15, 8) +#define NPCM_FIU_UMA_DR0_RB0 GENMASK(7, 0) + +/* FIU UMA Read Data Bytes 4-7 Register */ +#define NPCM_FIU_UMA_DR1_RB15 GENMASK(31, 24) +#define NPCM_FIU_UMA_DR1_RB14 GENMASK(23, 16) +#define NPCM_FIU_UMA_DR1_RB13 GENMASK(15, 8) +#define NPCM_FIU_UMA_DR1_RB12 GENMASK(7, 0) + +/* FIU UMA Read Data Bytes 8-11 Register */ +#define NPCM_FIU_UMA_DR2_RB15 GENMASK(31, 24) +#define NPCM_FIU_UMA_DR2_RB14 GENMASK(23, 16) +#define NPCM_FIU_UMA_DR2_RB13 GENMASK(15, 8) +#define NPCM_FIU_UMA_DR2_RB12 GENMASK(7, 0) + +/* FIU UMA Read Data Bytes 12-15 Register */ +#define NPCM_FIU_UMA_DR3_RB15 GENMASK(31, 24) +#define NPCM_FIU_UMA_DR3_RB14 GENMASK(23, 16) +#define NPCM_FIU_UMA_DR3_RB13 GENMASK(15, 8) +#define NPCM_FIU_UMA_DR3_RB12 GENMASK(7, 0) + +/* FIU Read Mode */ +enum { + DRD_SINGLE_WIRE_MODE = 0, + DRD_DUAL_IO_MODE = 1, + DRD_QUAD_IO_MODE = 2, + DRD_SPI_X_MODE = 3, +}; + +enum { + DWR_ABPCK_BIT_PER_CLK = 0, + DWR_ABPCK_2_BIT_PER_CLK = 1, + DWR_ABPCK_4_BIT_PER_CLK = 2, +}; + +enum { + DWR_DBPCK_BIT_PER_CLK = 0, + DWR_DBPCK_2_BIT_PER_CLK = 1, + DWR_DBPCK_4_BIT_PER_CLK = 2, +}; + +#define NPCM_FIU_DRD_16_BYTE_BURST 0x3000000 +#define NPCM_FIU_DWR_16_BYTE_BURST 0x3000000 + +#define MAP_SIZE_128MB 0x8000000 +#define MAP_SIZE_16MB 0x1000000 +#define MAP_SIZE_8MB 0x800000 + +#define FIU_DRD_MAX_DUMMY_NUMBER 3 +#define NPCM_MAX_CHIP_NUM 4 +#define CHUNK_SIZE 16 +#define UMA_MICRO_SEC_TIMEOUT 150 + +enum { + FIU0 = 0, + FIU3, + FIUX, +}; + +struct npcm_fiu_info { + char *name; + u32 fiu_id; + u32 max_map_size; + u32 max_cs; +}; + +struct fiu_data { + const struct npcm_fiu_info *npcm_fiu_data_info; + int fiu_max; +}; + +static const struct npcm_fiu_info npxm7xx_fiu_info[] = { + {.name = "FIU0", .fiu_id = FIU0, + .max_map_size = MAP_SIZE_128MB, .max_cs = 2}, + {.name = "FIU3", .fiu_id = FIU3, + .max_map_size = MAP_SIZE_128MB, .max_cs = 4}, + {.name = "FIUX", .fiu_id = FIUX, + .max_map_size = MAP_SIZE_16MB, .max_cs = 2} }; + +static const struct fiu_data npxm7xx_fiu_data = { + .npcm_fiu_data_info = npxm7xx_fiu_info, + .fiu_max = 3, +}; + +struct npcm_fiu_spi; + +struct npcm_fiu_chip { + void __iomem *flash_region_mapped_ptr; + struct npcm_fiu_spi *fiu; + unsigned long clkrate; + u32 chipselect; +}; + +struct npcm_fiu_spi { + struct npcm_fiu_chip chip[NPCM_MAX_CHIP_NUM]; + const struct npcm_fiu_info *info; + struct spi_mem_op drd_op; + struct resource *res_mem; + struct regmap *regmap; + unsigned long clkrate; + struct device *dev; + struct clk *clk; + bool spix_mode; +}; + +static const struct regmap_config npcm_mtd_regmap_config = { + .reg_bits = 32, + .val_bits = 32, + .reg_stride = 4, + .max_register = NPCM_FIU_MAX_REG_LIMIT, +}; + +static void npcm_fiu_set_drd(struct npcm_fiu_spi *fiu, + const struct spi_mem_op *op) +{ + regmap_update_bits(fiu->regmap, NPCM_FIU_DRD_CFG, + NPCM_FIU_DRD_CFG_ACCTYPE, + ilog2(op->addr.buswidth) << + NPCM_FIU_DRD_ACCTYPE_SHIFT); + fiu->drd_op.addr.buswidth = op->addr.buswidth; + regmap_update_bits(fiu->regmap, NPCM_FIU_DRD_CFG, + NPCM_FIU_DRD_CFG_DBW, + ((op->dummy.nbytes * ilog2(op->addr.buswidth)) / BITS_PER_BYTE) + << NPCM_FIU_DRD_DBW_SHIFT); + fiu->drd_op.dummy.nbytes = op->dummy.nbytes; + regmap_update_bits(fiu->regmap, NPCM_FIU_DRD_CFG, + NPCM_FIU_DRD_CFG_RDCMD, op->cmd.opcode); + fiu->drd_op.cmd.opcode = op->cmd.opcode; + regmap_update_bits(fiu->regmap, NPCM_FIU_DRD_CFG, + NPCM_FIU_DRD_CFG_ADDSIZ, + (op->addr.nbytes - 3) << NPCM_FIU_DRD_ADDSIZ_SHIFT); + fiu->drd_op.addr.nbytes = op->addr.nbytes; +} + +static ssize_t npcm_fiu_direct_read(struct spi_mem_dirmap_desc *desc, + u64 offs, size_t len, void *buf) +{ + struct npcm_fiu_spi *fiu = + spi_controller_get_devdata(desc->mem->spi->master); + struct npcm_fiu_chip *chip = &fiu->chip[desc->mem->spi->chip_select]; + void __iomem *src = (void __iomem *)(chip->flash_region_mapped_ptr + + offs); + u8 *buf_rx = buf; + u32 i; + + if (fiu->spix_mode) { + for (i = 0 ; i < len ; i++) + *(buf_rx + i) = ioread8(src + i); + } else { + if (desc->info.op_tmpl.addr.buswidth != fiu->drd_op.addr.buswidth || + desc->info.op_tmpl.dummy.nbytes != fiu->drd_op.dummy.nbytes || + desc->info.op_tmpl.cmd.opcode != fiu->drd_op.cmd.opcode || + desc->info.op_tmpl.addr.nbytes != fiu->drd_op.addr.nbytes) + npcm_fiu_set_drd(fiu, &desc->info.op_tmpl); + + memcpy_fromio(buf_rx, src, len); + } + + return len; +} + +static ssize_t npcm_fiu_direct_write(struct spi_mem_dirmap_desc *desc, + u64 offs, size_t len, const void *buf) +{ + struct npcm_fiu_spi *fiu = + spi_controller_get_devdata(desc->mem->spi->master); + struct npcm_fiu_chip *chip = &fiu->chip[desc->mem->spi->chip_select]; + void __iomem *dst = (void __iomem *)(chip->flash_region_mapped_ptr + + offs); + const u8 *buf_tx = buf; + u32 i; + + if (fiu->spix_mode) + for (i = 0 ; i < len ; i++) + iowrite8(*(buf_tx + i), dst + i); + else + memcpy_toio(dst, buf_tx, len); + + return len; +} + +static int npcm_fiu_uma_read(struct spi_mem *mem, + const struct spi_mem_op *op, u32 addr, + bool is_address_size, u8 *data, u32 data_size) +{ + struct npcm_fiu_spi *fiu = + spi_controller_get_devdata(mem->spi->master); + u32 uma_cfg = BIT(10); + u32 data_reg[4]; + int ret; + u32 val; + u32 i; + + regmap_update_bits(fiu->regmap, NPCM_FIU_UMA_CTS, + NPCM_FIU_UMA_CTS_DEV_NUM, + (mem->spi->chip_select << + NPCM_FIU_UMA_CTS_DEV_NUM_SHIFT)); + regmap_update_bits(fiu->regmap, NPCM_FIU_UMA_CMD, + NPCM_FIU_UMA_CMD_CMD, op->cmd.opcode); + + if (is_address_size) { + uma_cfg |= ilog2(op->cmd.buswidth); + uma_cfg |= ilog2(op->addr.buswidth) + << NPCM_FIU_UMA_CFG_ADBPCK_SHIFT; + if (op->dummy.nbytes) + uma_cfg |= ilog2(op->dummy.buswidth) + << NPCM_FIU_UMA_CFG_DBPCK_SHIFT; + uma_cfg |= ilog2(op->data.buswidth) + << NPCM_FIU_UMA_CFG_RDBPCK_SHIFT; + uma_cfg |= op->dummy.nbytes << NPCM_FIU_UMA_CFG_DBSIZ_SHIFT; + uma_cfg |= op->addr.nbytes << NPCM_FIU_UMA_CFG_ADDSIZ_SHIFT; + regmap_write(fiu->regmap, NPCM_FIU_UMA_ADDR, addr); + } else { + regmap_write(fiu->regmap, NPCM_FIU_UMA_ADDR, 0x0); + } + + uma_cfg |= data_size << NPCM_FIU_UMA_CFG_RDATSIZ_SHIFT; + regmap_write(fiu->regmap, NPCM_FIU_UMA_CFG, uma_cfg); + regmap_write_bits(fiu->regmap, NPCM_FIU_UMA_CTS, + NPCM_FIU_UMA_CTS_EXEC_DONE, + NPCM_FIU_UMA_CTS_EXEC_DONE); + ret = regmap_read_poll_timeout(fiu->regmap, NPCM_FIU_UMA_CTS, val, + (!(val & NPCM_FIU_UMA_CTS_EXEC_DONE)), 0, + UMA_MICRO_SEC_TIMEOUT); + if (ret) + return ret; + + if (data_size) { + for (i = 0; i < DIV_ROUND_UP(data_size, 4); i++) + regmap_read(fiu->regmap, NPCM_FIU_UMA_DR0 + (i * 4), + &data_reg[i]); + memcpy(data, data_reg, data_size); + } + + return 0; +} + +static int npcm_fiu_uma_write(struct spi_mem *mem, + const struct spi_mem_op *op, u8 cmd, + bool is_address_size, u8 *data, u32 data_size) +{ + struct npcm_fiu_spi *fiu = + spi_controller_get_devdata(mem->spi->master); + u32 uma_cfg = BIT(10); + u32 data_reg[4] = {0}; + u32 val; + u32 i; + + regmap_update_bits(fiu->regmap, NPCM_FIU_UMA_CTS, + NPCM_FIU_UMA_CTS_DEV_NUM, + (mem->spi->chip_select << + NPCM_FIU_UMA_CTS_DEV_NUM_SHIFT)); + + regmap_update_bits(fiu->regmap, NPCM_FIU_UMA_CMD, + NPCM_FIU_UMA_CMD_CMD, cmd); + + if (data_size) { + memcpy(data_reg, data, data_size); + for (i = 0; i < DIV_ROUND_UP(data_size, 4); i++) + regmap_write(fiu->regmap, NPCM_FIU_UMA_DW0 + (i * 4), + data_reg[i]); + } + + if (is_address_size) { + uma_cfg |= ilog2(op->cmd.buswidth); + uma_cfg |= ilog2(op->addr.buswidth) << + NPCM_FIU_UMA_CFG_ADBPCK_SHIFT; + uma_cfg |= ilog2(op->data.buswidth) << + NPCM_FIU_UMA_CFG_WDBPCK_SHIFT; + uma_cfg |= op->addr.nbytes << NPCM_FIU_UMA_CFG_ADDSIZ_SHIFT; + regmap_write(fiu->regmap, NPCM_FIU_UMA_ADDR, op->addr.val); + } else { + regmap_write(fiu->regmap, NPCM_FIU_UMA_ADDR, 0x0); + } + + uma_cfg |= (data_size << NPCM_FIU_UMA_CFG_WDATSIZ_SHIFT); + regmap_write(fiu->regmap, NPCM_FIU_UMA_CFG, uma_cfg); + + regmap_write_bits(fiu->regmap, NPCM_FIU_UMA_CTS, + NPCM_FIU_UMA_CTS_EXEC_DONE, + NPCM_FIU_UMA_CTS_EXEC_DONE); + + return regmap_read_poll_timeout(fiu->regmap, NPCM_FIU_UMA_CTS, val, + (!(val & NPCM_FIU_UMA_CTS_EXEC_DONE)), 0, + UMA_MICRO_SEC_TIMEOUT); +} + +static int npcm_fiu_manualwrite(struct spi_mem *mem, + const struct spi_mem_op *op) +{ + struct npcm_fiu_spi *fiu = + spi_controller_get_devdata(mem->spi->master); + u8 *data = (u8 *)op->data.buf.out; + u32 num_data_chunks; + u32 remain_data; + u32 idx = 0; + int ret; + + num_data_chunks = op->data.nbytes / CHUNK_SIZE; + remain_data = op->data.nbytes % CHUNK_SIZE; + + regmap_update_bits(fiu->regmap, NPCM_FIU_UMA_CTS, + NPCM_FIU_UMA_CTS_DEV_NUM, + (mem->spi->chip_select << + NPCM_FIU_UMA_CTS_DEV_NUM_SHIFT)); + regmap_update_bits(fiu->regmap, NPCM_FIU_UMA_CTS, + NPCM_FIU_UMA_CTS_SW_CS, 0); + + ret = npcm_fiu_uma_write(mem, op, op->cmd.opcode, true, NULL, 0); + if (ret) + return ret; + + /* Starting the data writing loop in multiples of 8 */ + for (idx = 0; idx < num_data_chunks; ++idx) { + ret = npcm_fiu_uma_write(mem, op, data[0], false, + &data[1], CHUNK_SIZE - 1); + if (ret) + return ret; + + data += CHUNK_SIZE; + } + + /* Handling chunk remains */ + if (remain_data > 0) { + ret = npcm_fiu_uma_write(mem, op, data[0], false, + &data[1], remain_data - 1); + if (ret) + return ret; + } + + regmap_update_bits(fiu->regmap, NPCM_FIU_UMA_CTS, + NPCM_FIU_UMA_CTS_SW_CS, NPCM_FIU_UMA_CTS_SW_CS); + + return 0; +} + +static int npcm_fiu_read(struct spi_mem *mem, const struct spi_mem_op *op) +{ + u8 *data = op->data.buf.in; + int i, readlen, currlen; + u8 *buf_ptr; + u32 addr; + int ret; + + i = 0; + currlen = op->data.nbytes; + + do { + addr = ((u32)op->addr.val + i); + if (currlen < 16) + readlen = currlen; + else + readlen = 16; + + buf_ptr = data + i; + ret = npcm_fiu_uma_read(mem, op, addr, true, buf_ptr, + readlen); + if (ret) + return ret; + + i += readlen; + currlen -= 16; + } while (currlen > 0); + + return 0; +} + +static void npcm_fiux_set_direct_wr(struct npcm_fiu_spi *fiu) +{ + regmap_write(fiu->regmap, NPCM_FIU_DWR_CFG, + NPCM_FIU_DWR_16_BYTE_BURST); + regmap_update_bits(fiu->regmap, NPCM_FIU_DWR_CFG, + NPCM_FIU_DWR_CFG_ABPCK, + DWR_ABPCK_4_BIT_PER_CLK << NPCM_FIU_DWR_ABPCK_SHIFT); + regmap_update_bits(fiu->regmap, NPCM_FIU_DWR_CFG, + NPCM_FIU_DWR_CFG_DBPCK, + DWR_DBPCK_4_BIT_PER_CLK << NPCM_FIU_DWR_DBPCK_SHIFT); +} + +static void npcm_fiux_set_direct_rd(struct npcm_fiu_spi *fiu) +{ + u32 rx_dummy = 0; + + regmap_write(fiu->regmap, NPCM_FIU_DRD_CFG, + NPCM_FIU_DRD_16_BYTE_BURST); + regmap_update_bits(fiu->regmap, NPCM_FIU_DRD_CFG, + NPCM_FIU_DRD_CFG_ACCTYPE, + DRD_SPI_X_MODE << NPCM_FIU_DRD_ACCTYPE_SHIFT); + regmap_update_bits(fiu->regmap, NPCM_FIU_DRD_CFG, + NPCM_FIU_DRD_CFG_DBW, + rx_dummy << NPCM_FIU_DRD_DBW_SHIFT); +} + +static int npcm_fiu_exec_op(struct spi_mem *mem, const struct spi_mem_op *op) +{ + struct npcm_fiu_spi *fiu = + spi_controller_get_devdata(mem->spi->master); + struct npcm_fiu_chip *chip = &fiu->chip[mem->spi->chip_select]; + int ret = 0; + u8 *buf; + + dev_dbg(fiu->dev, "cmd:%#x mode:%d.%d.%d.%d addr:%#llx len:%#x\n", + op->cmd.opcode, op->cmd.buswidth, op->addr.buswidth, + op->dummy.buswidth, op->data.buswidth, op->addr.val, + op->data.nbytes); + + if (fiu->spix_mode || op->addr.nbytes > 4) + return -ENOTSUPP; + + if (fiu->clkrate != chip->clkrate) { + ret = clk_set_rate(fiu->clk, chip->clkrate); + if (ret < 0) + dev_warn(fiu->dev, "Failed setting %lu frequency, stay at %lu frequency\n", + chip->clkrate, fiu->clkrate); + else + fiu->clkrate = chip->clkrate; + } + + if (op->data.dir == SPI_MEM_DATA_IN) { + if (!op->addr.nbytes) { + buf = op->data.buf.in; + ret = npcm_fiu_uma_read(mem, op, op->addr.val, false, + buf, op->data.nbytes); + } else { + ret = npcm_fiu_read(mem, op); + } + } else { + if (!op->addr.nbytes && !op->data.nbytes) + ret = npcm_fiu_uma_write(mem, op, op->cmd.opcode, false, + NULL, 0); + if (op->addr.nbytes && !op->data.nbytes) { + int i; + u8 buf_addr[4]; + u32 addr = op->addr.val; + + for (i = op->addr.nbytes - 1; i >= 0; i--) { + buf_addr[i] = addr & 0xff; + addr >>= 8; + } + ret = npcm_fiu_uma_write(mem, op, op->cmd.opcode, false, + buf_addr, op->addr.nbytes); + } + if (!op->addr.nbytes && op->data.nbytes) + ret = npcm_fiu_uma_write(mem, op, op->cmd.opcode, false, + (u8 *)op->data.buf.out, + op->data.nbytes); + if (op->addr.nbytes && op->data.nbytes) + ret = npcm_fiu_manualwrite(mem, op); + } + + return ret; +} + +static int npcm_fiu_dirmap_create(struct spi_mem_dirmap_desc *desc) +{ + struct npcm_fiu_spi *fiu = + spi_controller_get_devdata(desc->mem->spi->master); + struct npcm_fiu_chip *chip = &fiu->chip[desc->mem->spi->chip_select]; + struct regmap *gcr_regmap; + + if (!fiu->res_mem) { + dev_warn(fiu->dev, "Reserved memory not defined, direct read disabled\n"); + desc->nodirmap = true; + return 0; + } + + if (!fiu->spix_mode && + desc->info.op_tmpl.data.dir == SPI_MEM_DATA_OUT) { + desc->nodirmap = true; + return 0; + } + + if (!chip->flash_region_mapped_ptr) { + chip->flash_region_mapped_ptr = + devm_ioremap(fiu->dev, (fiu->res_mem->start + + (fiu->info->max_map_size * + desc->mem->spi->chip_select)), + (u32)desc->info.length); + if (!chip->flash_region_mapped_ptr) { + dev_warn(fiu->dev, "Error mapping memory region, direct read disabled\n"); + desc->nodirmap = true; + return 0; + } + } + + if (of_device_is_compatible(fiu->dev->of_node, "nuvoton,npcm750-fiu")) { + gcr_regmap = + syscon_regmap_lookup_by_compatible("nuvoton,npcm750-gcr"); + if (IS_ERR(gcr_regmap)) { + dev_warn(fiu->dev, "Didn't find nuvoton,npcm750-gcr, direct read disabled\n"); + desc->nodirmap = true; + return 0; + } + regmap_update_bits(gcr_regmap, NPCM7XX_INTCR3_OFFSET, + NPCM7XX_INTCR3_FIU_FIX, + NPCM7XX_INTCR3_FIU_FIX); + } + + if (desc->info.op_tmpl.data.dir == SPI_MEM_DATA_IN) { + if (!fiu->spix_mode) + npcm_fiu_set_drd(fiu, &desc->info.op_tmpl); + else + npcm_fiux_set_direct_rd(fiu); + + } else { + npcm_fiux_set_direct_wr(fiu); + } + + return 0; +} + +static int npcm_fiu_setup(struct spi_device *spi) +{ + struct spi_controller *ctrl = spi->master; + struct npcm_fiu_spi *fiu = spi_controller_get_devdata(ctrl); + struct npcm_fiu_chip *chip; + + chip = &fiu->chip[spi->chip_select]; + chip->fiu = fiu; + chip->chipselect = spi->chip_select; + chip->clkrate = spi->max_speed_hz; + + fiu->clkrate = clk_get_rate(fiu->clk); + + return 0; +} + +static const struct spi_controller_mem_ops npcm_fiu_mem_ops = { + .exec_op = npcm_fiu_exec_op, + .dirmap_create = npcm_fiu_dirmap_create, + .dirmap_read = npcm_fiu_direct_read, + .dirmap_write = npcm_fiu_direct_write, +}; + +static const struct of_device_id npcm_fiu_dt_ids[] = { + { .compatible = "nuvoton,npcm750-fiu", .data = &npxm7xx_fiu_data }, + { /* sentinel */ } +}; + +static int npcm_fiu_probe(struct platform_device *pdev) +{ + const struct fiu_data *fiu_data_match; + const struct of_device_id *match; + struct device *dev = &pdev->dev; + struct spi_controller *ctrl; + struct npcm_fiu_spi *fiu; + void __iomem *regbase; + struct resource *res; + int id, ret; + + ctrl = devm_spi_alloc_master(dev, sizeof(*fiu)); + if (!ctrl) + return -ENOMEM; + + fiu = spi_controller_get_devdata(ctrl); + + match = of_match_device(npcm_fiu_dt_ids, dev); + if (!match || !match->data) { + dev_err(dev, "No compatible OF match\n"); + return -ENODEV; + } + + fiu_data_match = match->data; + id = of_alias_get_id(dev->of_node, "fiu"); + if (id < 0 || id >= fiu_data_match->fiu_max) { + dev_err(dev, "Invalid platform device id: %d\n", id); + return -EINVAL; + } + + fiu->info = &fiu_data_match->npcm_fiu_data_info[id]; + + platform_set_drvdata(pdev, fiu); + fiu->dev = dev; + + res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "control"); + regbase = devm_ioremap_resource(dev, res); + if (IS_ERR(regbase)) + return PTR_ERR(regbase); + + fiu->regmap = devm_regmap_init_mmio(dev, regbase, + &npcm_mtd_regmap_config); + if (IS_ERR(fiu->regmap)) { + dev_err(dev, "Failed to create regmap\n"); + return PTR_ERR(fiu->regmap); + } + + fiu->res_mem = platform_get_resource_byname(pdev, IORESOURCE_MEM, + "memory"); + fiu->clk = devm_clk_get(dev, NULL); + if (IS_ERR(fiu->clk)) + return PTR_ERR(fiu->clk); + + fiu->spix_mode = of_property_read_bool(dev->of_node, + "nuvoton,spix-mode"); + + platform_set_drvdata(pdev, fiu); + clk_prepare_enable(fiu->clk); + + ctrl->mode_bits = SPI_RX_DUAL | SPI_RX_QUAD + | SPI_TX_DUAL | SPI_TX_QUAD; + ctrl->setup = npcm_fiu_setup; + ctrl->bus_num = -1; + ctrl->mem_ops = &npcm_fiu_mem_ops; + ctrl->num_chipselect = fiu->info->max_cs; + ctrl->dev.of_node = dev->of_node; + + ret = devm_spi_register_master(dev, ctrl); + if (ret) + clk_disable_unprepare(fiu->clk); + + return ret; +} + +static int npcm_fiu_remove(struct platform_device *pdev) +{ + struct npcm_fiu_spi *fiu = platform_get_drvdata(pdev); + + clk_disable_unprepare(fiu->clk); + return 0; +} + +MODULE_DEVICE_TABLE(of, npcm_fiu_dt_ids); + +static struct platform_driver npcm_fiu_driver = { + .driver = { + .name = "NPCM-FIU", + .bus = &platform_bus_type, + .of_match_table = npcm_fiu_dt_ids, + }, + .probe = npcm_fiu_probe, + .remove = npcm_fiu_remove, +}; +module_platform_driver(npcm_fiu_driver); + +MODULE_DESCRIPTION("Nuvoton FLASH Interface Unit SPI Controller Driver"); +MODULE_AUTHOR("Tomer Maimon <tomer.maimon@nuvoton.com>"); +MODULE_LICENSE("GPL v2"); diff --git a/drivers/spi/spi-npcm-pspi.c b/drivers/spi/spi-npcm-pspi.c new file mode 100644 index 000000000..56d10c451 --- /dev/null +++ b/drivers/spi/spi-npcm-pspi.c @@ -0,0 +1,463 @@ +// SPDX-License-Identifier: GPL-2.0 +// Copyright (c) 2018 Nuvoton Technology corporation. + +#include <linux/kernel.h> +#include <linux/bitfield.h> +#include <linux/bitops.h> +#include <linux/clk.h> +#include <linux/interrupt.h> +#include <linux/io.h> +#include <linux/module.h> +#include <linux/platform_device.h> +#include <linux/spi/spi.h> +#include <linux/reset.h> + +#include <asm/unaligned.h> + +#include <linux/regmap.h> +#include <linux/mfd/syscon.h> + +struct npcm_pspi { + struct completion xfer_done; + struct reset_control *reset; + struct spi_master *master; + unsigned int tx_bytes; + unsigned int rx_bytes; + void __iomem *base; + bool is_save_param; + u8 bits_per_word; + const u8 *tx_buf; + struct clk *clk; + u32 speed_hz; + u8 *rx_buf; + u16 mode; + u32 id; +}; + +#define DRIVER_NAME "npcm-pspi" + +#define NPCM_PSPI_DATA 0x00 +#define NPCM_PSPI_CTL1 0x02 +#define NPCM_PSPI_STAT 0x04 + +/* definitions for control and status register */ +#define NPCM_PSPI_CTL1_SPIEN BIT(0) +#define NPCM_PSPI_CTL1_MOD BIT(2) +#define NPCM_PSPI_CTL1_EIR BIT(5) +#define NPCM_PSPI_CTL1_EIW BIT(6) +#define NPCM_PSPI_CTL1_SCM BIT(7) +#define NPCM_PSPI_CTL1_SCIDL BIT(8) +#define NPCM_PSPI_CTL1_SCDV6_0 GENMASK(15, 9) + +#define NPCM_PSPI_STAT_BSY BIT(0) +#define NPCM_PSPI_STAT_RBF BIT(1) + +/* general definitions */ +#define NPCM_PSPI_TIMEOUT_MS 2000 +#define NPCM_PSPI_MAX_CLK_DIVIDER 256 +#define NPCM_PSPI_MIN_CLK_DIVIDER 4 +#define NPCM_PSPI_DEFAULT_CLK 25000000 + +static inline unsigned int bytes_per_word(unsigned int bits) +{ + return bits <= 8 ? 1 : 2; +} + +static inline void npcm_pspi_irq_enable(struct npcm_pspi *priv, u16 mask) +{ + u16 val; + + val = ioread16(priv->base + NPCM_PSPI_CTL1); + val |= mask; + iowrite16(val, priv->base + NPCM_PSPI_CTL1); +} + +static inline void npcm_pspi_irq_disable(struct npcm_pspi *priv, u16 mask) +{ + u16 val; + + val = ioread16(priv->base + NPCM_PSPI_CTL1); + val &= ~mask; + iowrite16(val, priv->base + NPCM_PSPI_CTL1); +} + +static inline void npcm_pspi_enable(struct npcm_pspi *priv) +{ + u16 val; + + val = ioread16(priv->base + NPCM_PSPI_CTL1); + val |= NPCM_PSPI_CTL1_SPIEN; + iowrite16(val, priv->base + NPCM_PSPI_CTL1); +} + +static inline void npcm_pspi_disable(struct npcm_pspi *priv) +{ + u16 val; + + val = ioread16(priv->base + NPCM_PSPI_CTL1); + val &= ~NPCM_PSPI_CTL1_SPIEN; + iowrite16(val, priv->base + NPCM_PSPI_CTL1); +} + +static void npcm_pspi_set_mode(struct spi_device *spi) +{ + struct npcm_pspi *priv = spi_master_get_devdata(spi->master); + u16 regtemp; + u16 mode_val; + + switch (spi->mode & (SPI_CPOL | SPI_CPHA)) { + case SPI_MODE_0: + mode_val = 0; + break; + case SPI_MODE_1: + mode_val = NPCM_PSPI_CTL1_SCIDL; + break; + case SPI_MODE_2: + mode_val = NPCM_PSPI_CTL1_SCM; + break; + case SPI_MODE_3: + mode_val = NPCM_PSPI_CTL1_SCIDL | NPCM_PSPI_CTL1_SCM; + break; + } + + regtemp = ioread16(priv->base + NPCM_PSPI_CTL1); + regtemp &= ~(NPCM_PSPI_CTL1_SCM | NPCM_PSPI_CTL1_SCIDL); + iowrite16(regtemp | mode_val, priv->base + NPCM_PSPI_CTL1); +} + +static void npcm_pspi_set_transfer_size(struct npcm_pspi *priv, int size) +{ + u16 regtemp; + + regtemp = ioread16(NPCM_PSPI_CTL1 + priv->base); + + switch (size) { + case 8: + regtemp &= ~NPCM_PSPI_CTL1_MOD; + break; + case 16: + regtemp |= NPCM_PSPI_CTL1_MOD; + break; + } + + iowrite16(regtemp, NPCM_PSPI_CTL1 + priv->base); +} + +static void npcm_pspi_set_baudrate(struct npcm_pspi *priv, unsigned int speed) +{ + u32 ckdiv; + u16 regtemp; + + /* the supported rates are numbers from 4 to 256. */ + ckdiv = DIV_ROUND_CLOSEST(clk_get_rate(priv->clk), (2 * speed)) - 1; + + regtemp = ioread16(NPCM_PSPI_CTL1 + priv->base); + regtemp &= ~NPCM_PSPI_CTL1_SCDV6_0; + iowrite16(regtemp | (ckdiv << 9), NPCM_PSPI_CTL1 + priv->base); +} + +static void npcm_pspi_setup_transfer(struct spi_device *spi, + struct spi_transfer *t) +{ + struct npcm_pspi *priv = spi_master_get_devdata(spi->master); + + priv->tx_buf = t->tx_buf; + priv->rx_buf = t->rx_buf; + priv->tx_bytes = t->len; + priv->rx_bytes = t->len; + + if (!priv->is_save_param || priv->mode != spi->mode) { + npcm_pspi_set_mode(spi); + priv->mode = spi->mode; + } + + /* + * If transfer is even length, and 8 bits per word transfer, + * then implement 16 bits-per-word transfer. + */ + if (priv->bits_per_word == 8 && !(t->len & 0x1)) + t->bits_per_word = 16; + + if (!priv->is_save_param || priv->bits_per_word != t->bits_per_word) { + npcm_pspi_set_transfer_size(priv, t->bits_per_word); + priv->bits_per_word = t->bits_per_word; + } + + if (!priv->is_save_param || priv->speed_hz != t->speed_hz) { + npcm_pspi_set_baudrate(priv, t->speed_hz); + priv->speed_hz = t->speed_hz; + } + + if (!priv->is_save_param) + priv->is_save_param = true; +} + +static void npcm_pspi_send(struct npcm_pspi *priv) +{ + int wsize; + u16 val; + + wsize = min(bytes_per_word(priv->bits_per_word), priv->tx_bytes); + priv->tx_bytes -= wsize; + + if (!priv->tx_buf) + return; + + switch (wsize) { + case 1: + val = *priv->tx_buf++; + iowrite8(val, NPCM_PSPI_DATA + priv->base); + break; + case 2: + val = *priv->tx_buf++; + val = *priv->tx_buf++ | (val << 8); + iowrite16(val, NPCM_PSPI_DATA + priv->base); + break; + default: + WARN_ON_ONCE(1); + return; + } +} + +static void npcm_pspi_recv(struct npcm_pspi *priv) +{ + int rsize; + u16 val; + + rsize = min(bytes_per_word(priv->bits_per_word), priv->rx_bytes); + priv->rx_bytes -= rsize; + + if (!priv->rx_buf) + return; + + switch (rsize) { + case 1: + *priv->rx_buf++ = ioread8(priv->base + NPCM_PSPI_DATA); + break; + case 2: + val = ioread16(priv->base + NPCM_PSPI_DATA); + *priv->rx_buf++ = (val >> 8); + *priv->rx_buf++ = val & 0xff; + break; + default: + WARN_ON_ONCE(1); + return; + } +} + +static int npcm_pspi_transfer_one(struct spi_master *master, + struct spi_device *spi, + struct spi_transfer *t) +{ + struct npcm_pspi *priv = spi_master_get_devdata(master); + int status; + + npcm_pspi_setup_transfer(spi, t); + reinit_completion(&priv->xfer_done); + npcm_pspi_enable(priv); + status = wait_for_completion_timeout(&priv->xfer_done, + msecs_to_jiffies + (NPCM_PSPI_TIMEOUT_MS)); + if (status == 0) { + npcm_pspi_disable(priv); + return -ETIMEDOUT; + } + + return 0; +} + +static int npcm_pspi_prepare_transfer_hardware(struct spi_master *master) +{ + struct npcm_pspi *priv = spi_master_get_devdata(master); + + npcm_pspi_irq_enable(priv, NPCM_PSPI_CTL1_EIR | NPCM_PSPI_CTL1_EIW); + + return 0; +} + +static int npcm_pspi_unprepare_transfer_hardware(struct spi_master *master) +{ + struct npcm_pspi *priv = spi_master_get_devdata(master); + + npcm_pspi_irq_disable(priv, NPCM_PSPI_CTL1_EIR | NPCM_PSPI_CTL1_EIW); + + return 0; +} + +static void npcm_pspi_reset_hw(struct npcm_pspi *priv) +{ + reset_control_assert(priv->reset); + udelay(5); + reset_control_deassert(priv->reset); +} + +static irqreturn_t npcm_pspi_handler(int irq, void *dev_id) +{ + struct npcm_pspi *priv = dev_id; + u8 stat; + + stat = ioread8(priv->base + NPCM_PSPI_STAT); + + if (!priv->tx_buf && !priv->rx_buf) + return IRQ_NONE; + + if (priv->tx_buf) { + if (stat & NPCM_PSPI_STAT_RBF) { + ioread8(NPCM_PSPI_DATA + priv->base); + if (priv->tx_bytes == 0) { + npcm_pspi_disable(priv); + complete(&priv->xfer_done); + return IRQ_HANDLED; + } + } + + if ((stat & NPCM_PSPI_STAT_BSY) == 0) + if (priv->tx_bytes) + npcm_pspi_send(priv); + } + + if (priv->rx_buf) { + if (stat & NPCM_PSPI_STAT_RBF) { + if (!priv->rx_bytes) + return IRQ_NONE; + + npcm_pspi_recv(priv); + + if (!priv->rx_bytes) { + npcm_pspi_disable(priv); + complete(&priv->xfer_done); + return IRQ_HANDLED; + } + } + + if (((stat & NPCM_PSPI_STAT_BSY) == 0) && !priv->tx_buf) + iowrite8(0x0, NPCM_PSPI_DATA + priv->base); + } + + return IRQ_HANDLED; +} + +static int npcm_pspi_probe(struct platform_device *pdev) +{ + struct npcm_pspi *priv; + struct spi_master *master; + unsigned long clk_hz; + int irq; + int ret; + + master = spi_alloc_master(&pdev->dev, sizeof(*priv)); + if (!master) + return -ENOMEM; + + platform_set_drvdata(pdev, master); + + priv = spi_master_get_devdata(master); + priv->master = master; + priv->is_save_param = false; + + priv->base = devm_platform_ioremap_resource(pdev, 0); + if (IS_ERR(priv->base)) { + ret = PTR_ERR(priv->base); + goto out_master_put; + } + + priv->clk = devm_clk_get(&pdev->dev, NULL); + if (IS_ERR(priv->clk)) { + dev_err(&pdev->dev, "failed to get clock\n"); + ret = PTR_ERR(priv->clk); + goto out_master_put; + } + + ret = clk_prepare_enable(priv->clk); + if (ret) + goto out_master_put; + + irq = platform_get_irq(pdev, 0); + if (irq < 0) { + ret = irq; + goto out_disable_clk; + } + + priv->reset = devm_reset_control_get(&pdev->dev, NULL); + if (IS_ERR(priv->reset)) { + ret = PTR_ERR(priv->reset); + goto out_disable_clk; + } + + /* reset SPI-HW block */ + npcm_pspi_reset_hw(priv); + + ret = devm_request_irq(&pdev->dev, irq, npcm_pspi_handler, 0, + "npcm-pspi", priv); + if (ret) { + dev_err(&pdev->dev, "failed to request IRQ\n"); + goto out_disable_clk; + } + + init_completion(&priv->xfer_done); + + clk_hz = clk_get_rate(priv->clk); + + master->max_speed_hz = DIV_ROUND_UP(clk_hz, NPCM_PSPI_MIN_CLK_DIVIDER); + master->min_speed_hz = DIV_ROUND_UP(clk_hz, NPCM_PSPI_MAX_CLK_DIVIDER); + master->mode_bits = SPI_CPHA | SPI_CPOL; + master->dev.of_node = pdev->dev.of_node; + master->bus_num = -1; + master->bits_per_word_mask = SPI_BPW_MASK(8) | SPI_BPW_MASK(16); + master->transfer_one = npcm_pspi_transfer_one; + master->prepare_transfer_hardware = + npcm_pspi_prepare_transfer_hardware; + master->unprepare_transfer_hardware = + npcm_pspi_unprepare_transfer_hardware; + master->use_gpio_descriptors = true; + + /* set to default clock rate */ + npcm_pspi_set_baudrate(priv, NPCM_PSPI_DEFAULT_CLK); + + ret = devm_spi_register_master(&pdev->dev, master); + if (ret) + goto out_disable_clk; + + pr_info("NPCM Peripheral SPI %d probed\n", master->bus_num); + + return 0; + +out_disable_clk: + clk_disable_unprepare(priv->clk); + +out_master_put: + spi_master_put(master); + return ret; +} + +static int npcm_pspi_remove(struct platform_device *pdev) +{ + struct spi_master *master = platform_get_drvdata(pdev); + struct npcm_pspi *priv = spi_master_get_devdata(master); + + npcm_pspi_reset_hw(priv); + clk_disable_unprepare(priv->clk); + + return 0; +} + +static const struct of_device_id npcm_pspi_match[] = { + { .compatible = "nuvoton,npcm750-pspi", .data = NULL }, + {} +}; +MODULE_DEVICE_TABLE(of, npcm_pspi_match); + +static struct platform_driver npcm_pspi_driver = { + .driver = { + .name = DRIVER_NAME, + .of_match_table = npcm_pspi_match, + }, + .probe = npcm_pspi_probe, + .remove = npcm_pspi_remove, +}; +module_platform_driver(npcm_pspi_driver); + +MODULE_DESCRIPTION("NPCM peripheral SPI Controller driver"); +MODULE_AUTHOR("Tomer Maimon <tomer.maimon@nuvoton.com>"); +MODULE_LICENSE("GPL v2"); + diff --git a/drivers/spi/spi-nxp-fspi.c b/drivers/spi/spi-nxp-fspi.c new file mode 100644 index 000000000..f40b93960 --- /dev/null +++ b/drivers/spi/spi-nxp-fspi.c @@ -0,0 +1,1195 @@ +// SPDX-License-Identifier: GPL-2.0+ + +/* + * NXP FlexSPI(FSPI) controller driver. + * + * Copyright 2019-2020 NXP + * Copyright 2020 Puresoftware Ltd. + * + * FlexSPI is a flexsible SPI host controller which supports two SPI + * channels and up to 4 external devices. Each channel supports + * Single/Dual/Quad/Octal mode data transfer (1/2/4/8 bidirectional + * data lines). + * + * FlexSPI controller is driven by the LUT(Look-up Table) registers + * LUT registers are a look-up-table for sequences of instructions. + * A valid sequence consists of four LUT registers. + * Maximum 32 LUT sequences can be programmed simultaneously. + * + * LUTs are being created at run-time based on the commands passed + * from the spi-mem framework, thus using single LUT index. + * + * Software triggered Flash read/write access by IP Bus. + * + * Memory mapped read access by AHB Bus. + * + * Based on SPI MEM interface and spi-fsl-qspi.c driver. + * + * Author: + * Yogesh Narayan Gaur <yogeshnarayan.gaur@nxp.com> + * Boris Brezillon <bbrezillon@kernel.org> + * Frieder Schrempf <frieder.schrempf@kontron.de> + */ + +#include <linux/acpi.h> +#include <linux/bitops.h> +#include <linux/clk.h> +#include <linux/completion.h> +#include <linux/delay.h> +#include <linux/err.h> +#include <linux/errno.h> +#include <linux/interrupt.h> +#include <linux/io.h> +#include <linux/iopoll.h> +#include <linux/jiffies.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/mutex.h> +#include <linux/of.h> +#include <linux/of_device.h> +#include <linux/platform_device.h> +#include <linux/pm_qos.h> +#include <linux/sizes.h> + +#include <linux/spi/spi.h> +#include <linux/spi/spi-mem.h> + +/* + * The driver only uses one single LUT entry, that is updated on + * each call of exec_op(). Index 0 is preset at boot with a basic + * read operation, so let's use the last entry (31). + */ +#define SEQID_LUT 31 + +/* Registers used by the driver */ +#define FSPI_MCR0 0x00 +#define FSPI_MCR0_AHB_TIMEOUT(x) ((x) << 24) +#define FSPI_MCR0_IP_TIMEOUT(x) ((x) << 16) +#define FSPI_MCR0_LEARN_EN BIT(15) +#define FSPI_MCR0_SCRFRUN_EN BIT(14) +#define FSPI_MCR0_OCTCOMB_EN BIT(13) +#define FSPI_MCR0_DOZE_EN BIT(12) +#define FSPI_MCR0_HSEN BIT(11) +#define FSPI_MCR0_SERCLKDIV BIT(8) +#define FSPI_MCR0_ATDF_EN BIT(7) +#define FSPI_MCR0_ARDF_EN BIT(6) +#define FSPI_MCR0_RXCLKSRC(x) ((x) << 4) +#define FSPI_MCR0_END_CFG(x) ((x) << 2) +#define FSPI_MCR0_MDIS BIT(1) +#define FSPI_MCR0_SWRST BIT(0) + +#define FSPI_MCR1 0x04 +#define FSPI_MCR1_SEQ_TIMEOUT(x) ((x) << 16) +#define FSPI_MCR1_AHB_TIMEOUT(x) (x) + +#define FSPI_MCR2 0x08 +#define FSPI_MCR2_IDLE_WAIT(x) ((x) << 24) +#define FSPI_MCR2_SAMEDEVICEEN BIT(15) +#define FSPI_MCR2_CLRLRPHS BIT(14) +#define FSPI_MCR2_ABRDATSZ BIT(8) +#define FSPI_MCR2_ABRLEARN BIT(7) +#define FSPI_MCR2_ABR_READ BIT(6) +#define FSPI_MCR2_ABRWRITE BIT(5) +#define FSPI_MCR2_ABRDUMMY BIT(4) +#define FSPI_MCR2_ABR_MODE BIT(3) +#define FSPI_MCR2_ABRCADDR BIT(2) +#define FSPI_MCR2_ABRRADDR BIT(1) +#define FSPI_MCR2_ABR_CMD BIT(0) + +#define FSPI_AHBCR 0x0c +#define FSPI_AHBCR_RDADDROPT BIT(6) +#define FSPI_AHBCR_PREF_EN BIT(5) +#define FSPI_AHBCR_BUFF_EN BIT(4) +#define FSPI_AHBCR_CACH_EN BIT(3) +#define FSPI_AHBCR_CLRTXBUF BIT(2) +#define FSPI_AHBCR_CLRRXBUF BIT(1) +#define FSPI_AHBCR_PAR_EN BIT(0) + +#define FSPI_INTEN 0x10 +#define FSPI_INTEN_SCLKSBWR BIT(9) +#define FSPI_INTEN_SCLKSBRD BIT(8) +#define FSPI_INTEN_DATALRNFL BIT(7) +#define FSPI_INTEN_IPTXWE BIT(6) +#define FSPI_INTEN_IPRXWA BIT(5) +#define FSPI_INTEN_AHBCMDERR BIT(4) +#define FSPI_INTEN_IPCMDERR BIT(3) +#define FSPI_INTEN_AHBCMDGE BIT(2) +#define FSPI_INTEN_IPCMDGE BIT(1) +#define FSPI_INTEN_IPCMDDONE BIT(0) + +#define FSPI_INTR 0x14 +#define FSPI_INTR_SCLKSBWR BIT(9) +#define FSPI_INTR_SCLKSBRD BIT(8) +#define FSPI_INTR_DATALRNFL BIT(7) +#define FSPI_INTR_IPTXWE BIT(6) +#define FSPI_INTR_IPRXWA BIT(5) +#define FSPI_INTR_AHBCMDERR BIT(4) +#define FSPI_INTR_IPCMDERR BIT(3) +#define FSPI_INTR_AHBCMDGE BIT(2) +#define FSPI_INTR_IPCMDGE BIT(1) +#define FSPI_INTR_IPCMDDONE BIT(0) + +#define FSPI_LUTKEY 0x18 +#define FSPI_LUTKEY_VALUE 0x5AF05AF0 + +#define FSPI_LCKCR 0x1C + +#define FSPI_LCKER_LOCK 0x1 +#define FSPI_LCKER_UNLOCK 0x2 + +#define FSPI_BUFXCR_INVALID_MSTRID 0xE +#define FSPI_AHBRX_BUF0CR0 0x20 +#define FSPI_AHBRX_BUF1CR0 0x24 +#define FSPI_AHBRX_BUF2CR0 0x28 +#define FSPI_AHBRX_BUF3CR0 0x2C +#define FSPI_AHBRX_BUF4CR0 0x30 +#define FSPI_AHBRX_BUF5CR0 0x34 +#define FSPI_AHBRX_BUF6CR0 0x38 +#define FSPI_AHBRX_BUF7CR0 0x3C +#define FSPI_AHBRXBUF0CR7_PREF BIT(31) + +#define FSPI_AHBRX_BUF0CR1 0x40 +#define FSPI_AHBRX_BUF1CR1 0x44 +#define FSPI_AHBRX_BUF2CR1 0x48 +#define FSPI_AHBRX_BUF3CR1 0x4C +#define FSPI_AHBRX_BUF4CR1 0x50 +#define FSPI_AHBRX_BUF5CR1 0x54 +#define FSPI_AHBRX_BUF6CR1 0x58 +#define FSPI_AHBRX_BUF7CR1 0x5C + +#define FSPI_FLSHA1CR0 0x60 +#define FSPI_FLSHA2CR0 0x64 +#define FSPI_FLSHB1CR0 0x68 +#define FSPI_FLSHB2CR0 0x6C +#define FSPI_FLSHXCR0_SZ_KB 10 +#define FSPI_FLSHXCR0_SZ(x) ((x) >> FSPI_FLSHXCR0_SZ_KB) + +#define FSPI_FLSHA1CR1 0x70 +#define FSPI_FLSHA2CR1 0x74 +#define FSPI_FLSHB1CR1 0x78 +#define FSPI_FLSHB2CR1 0x7C +#define FSPI_FLSHXCR1_CSINTR(x) ((x) << 16) +#define FSPI_FLSHXCR1_CAS(x) ((x) << 11) +#define FSPI_FLSHXCR1_WA BIT(10) +#define FSPI_FLSHXCR1_TCSH(x) ((x) << 5) +#define FSPI_FLSHXCR1_TCSS(x) (x) + +#define FSPI_FLSHA1CR2 0x80 +#define FSPI_FLSHA2CR2 0x84 +#define FSPI_FLSHB1CR2 0x88 +#define FSPI_FLSHB2CR2 0x8C +#define FSPI_FLSHXCR2_CLRINSP BIT(24) +#define FSPI_FLSHXCR2_AWRWAIT BIT(16) +#define FSPI_FLSHXCR2_AWRSEQN_SHIFT 13 +#define FSPI_FLSHXCR2_AWRSEQI_SHIFT 8 +#define FSPI_FLSHXCR2_ARDSEQN_SHIFT 5 +#define FSPI_FLSHXCR2_ARDSEQI_SHIFT 0 + +#define FSPI_IPCR0 0xA0 + +#define FSPI_IPCR1 0xA4 +#define FSPI_IPCR1_IPAREN BIT(31) +#define FSPI_IPCR1_SEQNUM_SHIFT 24 +#define FSPI_IPCR1_SEQID_SHIFT 16 +#define FSPI_IPCR1_IDATSZ(x) (x) + +#define FSPI_IPCMD 0xB0 +#define FSPI_IPCMD_TRG BIT(0) + +#define FSPI_DLPR 0xB4 + +#define FSPI_IPRXFCR 0xB8 +#define FSPI_IPRXFCR_CLR BIT(0) +#define FSPI_IPRXFCR_DMA_EN BIT(1) +#define FSPI_IPRXFCR_WMRK(x) ((x) << 2) + +#define FSPI_IPTXFCR 0xBC +#define FSPI_IPTXFCR_CLR BIT(0) +#define FSPI_IPTXFCR_DMA_EN BIT(1) +#define FSPI_IPTXFCR_WMRK(x) ((x) << 2) + +#define FSPI_DLLACR 0xC0 +#define FSPI_DLLACR_OVRDEN BIT(8) + +#define FSPI_DLLBCR 0xC4 +#define FSPI_DLLBCR_OVRDEN BIT(8) + +#define FSPI_STS0 0xE0 +#define FSPI_STS0_DLPHB(x) ((x) << 8) +#define FSPI_STS0_DLPHA(x) ((x) << 4) +#define FSPI_STS0_CMD_SRC(x) ((x) << 2) +#define FSPI_STS0_ARB_IDLE BIT(1) +#define FSPI_STS0_SEQ_IDLE BIT(0) + +#define FSPI_STS1 0xE4 +#define FSPI_STS1_IP_ERRCD(x) ((x) << 24) +#define FSPI_STS1_IP_ERRID(x) ((x) << 16) +#define FSPI_STS1_AHB_ERRCD(x) ((x) << 8) +#define FSPI_STS1_AHB_ERRID(x) (x) + +#define FSPI_AHBSPNST 0xEC +#define FSPI_AHBSPNST_DATLFT(x) ((x) << 16) +#define FSPI_AHBSPNST_BUFID(x) ((x) << 1) +#define FSPI_AHBSPNST_ACTIVE BIT(0) + +#define FSPI_IPRXFSTS 0xF0 +#define FSPI_IPRXFSTS_RDCNTR(x) ((x) << 16) +#define FSPI_IPRXFSTS_FILL(x) (x) + +#define FSPI_IPTXFSTS 0xF4 +#define FSPI_IPTXFSTS_WRCNTR(x) ((x) << 16) +#define FSPI_IPTXFSTS_FILL(x) (x) + +#define FSPI_RFDR 0x100 +#define FSPI_TFDR 0x180 + +#define FSPI_LUT_BASE 0x200 +#define FSPI_LUT_OFFSET (SEQID_LUT * 4 * 4) +#define FSPI_LUT_REG(idx) \ + (FSPI_LUT_BASE + FSPI_LUT_OFFSET + (idx) * 4) + +/* register map end */ + +/* Instruction set for the LUT register. */ +#define LUT_STOP 0x00 +#define LUT_CMD 0x01 +#define LUT_ADDR 0x02 +#define LUT_CADDR_SDR 0x03 +#define LUT_MODE 0x04 +#define LUT_MODE2 0x05 +#define LUT_MODE4 0x06 +#define LUT_MODE8 0x07 +#define LUT_NXP_WRITE 0x08 +#define LUT_NXP_READ 0x09 +#define LUT_LEARN_SDR 0x0A +#define LUT_DATSZ_SDR 0x0B +#define LUT_DUMMY 0x0C +#define LUT_DUMMY_RWDS_SDR 0x0D +#define LUT_JMP_ON_CS 0x1F +#define LUT_CMD_DDR 0x21 +#define LUT_ADDR_DDR 0x22 +#define LUT_CADDR_DDR 0x23 +#define LUT_MODE_DDR 0x24 +#define LUT_MODE2_DDR 0x25 +#define LUT_MODE4_DDR 0x26 +#define LUT_MODE8_DDR 0x27 +#define LUT_WRITE_DDR 0x28 +#define LUT_READ_DDR 0x29 +#define LUT_LEARN_DDR 0x2A +#define LUT_DATSZ_DDR 0x2B +#define LUT_DUMMY_DDR 0x2C +#define LUT_DUMMY_RWDS_DDR 0x2D + +/* + * Calculate number of required PAD bits for LUT register. + * + * The pad stands for the number of IO lines [0:7]. + * For example, the octal read needs eight IO lines, + * so you should use LUT_PAD(8). This macro + * returns 3 i.e. use eight (2^3) IP lines for read. + */ +#define LUT_PAD(x) (fls(x) - 1) + +/* + * Macro for constructing the LUT entries with the following + * register layout: + * + * --------------------------------------------------- + * | INSTR1 | PAD1 | OPRND1 | INSTR0 | PAD0 | OPRND0 | + * --------------------------------------------------- + */ +#define PAD_SHIFT 8 +#define INSTR_SHIFT 10 +#define OPRND_SHIFT 16 + +/* Macros for constructing the LUT register. */ +#define LUT_DEF(idx, ins, pad, opr) \ + ((((ins) << INSTR_SHIFT) | ((pad) << PAD_SHIFT) | \ + (opr)) << (((idx) % 2) * OPRND_SHIFT)) + +#define POLL_TOUT 5000 +#define NXP_FSPI_MAX_CHIPSELECT 4 +#define NXP_FSPI_MIN_IOMAP SZ_4M + +struct nxp_fspi_devtype_data { + unsigned int rxfifo; + unsigned int txfifo; + unsigned int ahb_buf_size; + unsigned int quirks; + bool little_endian; +}; + +static const struct nxp_fspi_devtype_data lx2160a_data = { + .rxfifo = SZ_512, /* (64 * 64 bits) */ + .txfifo = SZ_1K, /* (128 * 64 bits) */ + .ahb_buf_size = SZ_2K, /* (256 * 64 bits) */ + .quirks = 0, + .little_endian = true, /* little-endian */ +}; + +static const struct nxp_fspi_devtype_data imx8mm_data = { + .rxfifo = SZ_512, /* (64 * 64 bits) */ + .txfifo = SZ_1K, /* (128 * 64 bits) */ + .ahb_buf_size = SZ_2K, /* (256 * 64 bits) */ + .quirks = 0, + .little_endian = true, /* little-endian */ +}; + +static const struct nxp_fspi_devtype_data imx8qxp_data = { + .rxfifo = SZ_512, /* (64 * 64 bits) */ + .txfifo = SZ_1K, /* (128 * 64 bits) */ + .ahb_buf_size = SZ_2K, /* (256 * 64 bits) */ + .quirks = 0, + .little_endian = true, /* little-endian */ +}; + +struct nxp_fspi { + void __iomem *iobase; + void __iomem *ahb_addr; + u32 memmap_phy; + u32 memmap_phy_size; + u32 memmap_start; + u32 memmap_len; + struct clk *clk, *clk_en; + struct device *dev; + struct completion c; + const struct nxp_fspi_devtype_data *devtype_data; + struct mutex lock; + struct pm_qos_request pm_qos_req; + int selected; +}; + +/* + * R/W functions for big- or little-endian registers: + * The FSPI controller's endianness is independent of + * the CPU core's endianness. So far, although the CPU + * core is little-endian the FSPI controller can use + * big-endian or little-endian. + */ +static void fspi_writel(struct nxp_fspi *f, u32 val, void __iomem *addr) +{ + if (f->devtype_data->little_endian) + iowrite32(val, addr); + else + iowrite32be(val, addr); +} + +static u32 fspi_readl(struct nxp_fspi *f, void __iomem *addr) +{ + if (f->devtype_data->little_endian) + return ioread32(addr); + else + return ioread32be(addr); +} + +static irqreturn_t nxp_fspi_irq_handler(int irq, void *dev_id) +{ + struct nxp_fspi *f = dev_id; + u32 reg; + + /* clear interrupt */ + reg = fspi_readl(f, f->iobase + FSPI_INTR); + fspi_writel(f, FSPI_INTR_IPCMDDONE, f->iobase + FSPI_INTR); + + if (reg & FSPI_INTR_IPCMDDONE) + complete(&f->c); + + return IRQ_HANDLED; +} + +static int nxp_fspi_check_buswidth(struct nxp_fspi *f, u8 width) +{ + switch (width) { + case 1: + case 2: + case 4: + case 8: + return 0; + } + + return -ENOTSUPP; +} + +static bool nxp_fspi_supports_op(struct spi_mem *mem, + const struct spi_mem_op *op) +{ + struct nxp_fspi *f = spi_controller_get_devdata(mem->spi->master); + int ret; + + ret = nxp_fspi_check_buswidth(f, op->cmd.buswidth); + + if (op->addr.nbytes) + ret |= nxp_fspi_check_buswidth(f, op->addr.buswidth); + + if (op->dummy.nbytes) + ret |= nxp_fspi_check_buswidth(f, op->dummy.buswidth); + + if (op->data.nbytes) + ret |= nxp_fspi_check_buswidth(f, op->data.buswidth); + + if (ret) + return false; + + /* + * The number of address bytes should be equal to or less than 4 bytes. + */ + if (op->addr.nbytes > 4) + return false; + + /* + * If requested address value is greater than controller assigned + * memory mapped space, return error as it didn't fit in the range + * of assigned address space. + */ + if (op->addr.val >= f->memmap_phy_size) + return false; + + /* Max 64 dummy clock cycles supported */ + if (op->dummy.buswidth && + (op->dummy.nbytes * 8 / op->dummy.buswidth > 64)) + return false; + + /* Max data length, check controller limits and alignment */ + if (op->data.dir == SPI_MEM_DATA_IN && + (op->data.nbytes > f->devtype_data->ahb_buf_size || + (op->data.nbytes > f->devtype_data->rxfifo - 4 && + !IS_ALIGNED(op->data.nbytes, 8)))) + return false; + + if (op->data.dir == SPI_MEM_DATA_OUT && + op->data.nbytes > f->devtype_data->txfifo) + return false; + + return spi_mem_default_supports_op(mem, op); +} + +/* Instead of busy looping invoke readl_poll_timeout functionality. */ +static int fspi_readl_poll_tout(struct nxp_fspi *f, void __iomem *base, + u32 mask, u32 delay_us, + u32 timeout_us, bool c) +{ + u32 reg; + + if (!f->devtype_data->little_endian) + mask = (u32)cpu_to_be32(mask); + + if (c) + return readl_poll_timeout(base, reg, (reg & mask), + delay_us, timeout_us); + else + return readl_poll_timeout(base, reg, !(reg & mask), + delay_us, timeout_us); +} + +/* + * If the slave device content being changed by Write/Erase, need to + * invalidate the AHB buffer. This can be achieved by doing the reset + * of controller after setting MCR0[SWRESET] bit. + */ +static inline void nxp_fspi_invalid(struct nxp_fspi *f) +{ + u32 reg; + int ret; + + reg = fspi_readl(f, f->iobase + FSPI_MCR0); + fspi_writel(f, reg | FSPI_MCR0_SWRST, f->iobase + FSPI_MCR0); + + /* w1c register, wait unit clear */ + ret = fspi_readl_poll_tout(f, f->iobase + FSPI_MCR0, + FSPI_MCR0_SWRST, 0, POLL_TOUT, false); + WARN_ON(ret); +} + +static void nxp_fspi_prepare_lut(struct nxp_fspi *f, + const struct spi_mem_op *op) +{ + void __iomem *base = f->iobase; + u32 lutval[4] = {}; + int lutidx = 1, i; + + /* cmd */ + lutval[0] |= LUT_DEF(0, LUT_CMD, LUT_PAD(op->cmd.buswidth), + op->cmd.opcode); + + /* addr bytes */ + if (op->addr.nbytes) { + lutval[lutidx / 2] |= LUT_DEF(lutidx, LUT_ADDR, + LUT_PAD(op->addr.buswidth), + op->addr.nbytes * 8); + lutidx++; + } + + /* dummy bytes, if needed */ + if (op->dummy.nbytes) { + lutval[lutidx / 2] |= LUT_DEF(lutidx, LUT_DUMMY, + /* + * Due to FlexSPI controller limitation number of PAD for dummy + * buswidth needs to be programmed as equal to data buswidth. + */ + LUT_PAD(op->data.buswidth), + op->dummy.nbytes * 8 / + op->dummy.buswidth); + lutidx++; + } + + /* read/write data bytes */ + if (op->data.nbytes) { + lutval[lutidx / 2] |= LUT_DEF(lutidx, + op->data.dir == SPI_MEM_DATA_IN ? + LUT_NXP_READ : LUT_NXP_WRITE, + LUT_PAD(op->data.buswidth), + 0); + lutidx++; + } + + /* stop condition. */ + lutval[lutidx / 2] |= LUT_DEF(lutidx, LUT_STOP, 0, 0); + + /* unlock LUT */ + fspi_writel(f, FSPI_LUTKEY_VALUE, f->iobase + FSPI_LUTKEY); + fspi_writel(f, FSPI_LCKER_UNLOCK, f->iobase + FSPI_LCKCR); + + /* fill LUT */ + for (i = 0; i < ARRAY_SIZE(lutval); i++) + fspi_writel(f, lutval[i], base + FSPI_LUT_REG(i)); + + dev_dbg(f->dev, "CMD[%x] lutval[0:%x \t 1:%x \t 2:%x \t 3:%x]\n", + op->cmd.opcode, lutval[0], lutval[1], lutval[2], lutval[3]); + + /* lock LUT */ + fspi_writel(f, FSPI_LUTKEY_VALUE, f->iobase + FSPI_LUTKEY); + fspi_writel(f, FSPI_LCKER_LOCK, f->iobase + FSPI_LCKCR); +} + +static int nxp_fspi_clk_prep_enable(struct nxp_fspi *f) +{ + int ret; + + if (is_acpi_node(f->dev->fwnode)) + return 0; + + ret = clk_prepare_enable(f->clk_en); + if (ret) + return ret; + + ret = clk_prepare_enable(f->clk); + if (ret) { + clk_disable_unprepare(f->clk_en); + return ret; + } + + return 0; +} + +static int nxp_fspi_clk_disable_unprep(struct nxp_fspi *f) +{ + if (is_acpi_node(f->dev->fwnode)) + return 0; + + clk_disable_unprepare(f->clk); + clk_disable_unprepare(f->clk_en); + + return 0; +} + +/* + * In FlexSPI controller, flash access is based on value of FSPI_FLSHXXCR0 + * register and start base address of the slave device. + * + * (Higher address) + * -------- <-- FLSHB2CR0 + * | B2 | + * | | + * B2 start address --> -------- <-- FLSHB1CR0 + * | B1 | + * | | + * B1 start address --> -------- <-- FLSHA2CR0 + * | A2 | + * | | + * A2 start address --> -------- <-- FLSHA1CR0 + * | A1 | + * | | + * A1 start address --> -------- (Lower address) + * + * + * Start base address defines the starting address range for given CS and + * FSPI_FLSHXXCR0 defines the size of the slave device connected at given CS. + * + * But, different targets are having different combinations of number of CS, + * some targets only have single CS or two CS covering controller's full + * memory mapped space area. + * Thus, implementation is being done as independent of the size and number + * of the connected slave device. + * Assign controller memory mapped space size as the size to the connected + * slave device. + * Mark FLSHxxCR0 as zero initially and then assign value only to the selected + * chip-select Flash configuration register. + * + * For e.g. to access CS2 (B1), FLSHB1CR0 register would be equal to the + * memory mapped size of the controller. + * Value for rest of the CS FLSHxxCR0 register would be zero. + * + */ +static void nxp_fspi_select_mem(struct nxp_fspi *f, struct spi_device *spi) +{ + unsigned long rate = spi->max_speed_hz; + int ret; + uint64_t size_kb; + + /* + * Return, if previously selected slave device is same as current + * requested slave device. + */ + if (f->selected == spi->chip_select) + return; + + /* Reset FLSHxxCR0 registers */ + fspi_writel(f, 0, f->iobase + FSPI_FLSHA1CR0); + fspi_writel(f, 0, f->iobase + FSPI_FLSHA2CR0); + fspi_writel(f, 0, f->iobase + FSPI_FLSHB1CR0); + fspi_writel(f, 0, f->iobase + FSPI_FLSHB2CR0); + + /* Assign controller memory mapped space as size, KBytes, of flash. */ + size_kb = FSPI_FLSHXCR0_SZ(f->memmap_phy_size); + + fspi_writel(f, size_kb, f->iobase + FSPI_FLSHA1CR0 + + 4 * spi->chip_select); + + dev_dbg(f->dev, "Slave device [CS:%x] selected\n", spi->chip_select); + + nxp_fspi_clk_disable_unprep(f); + + ret = clk_set_rate(f->clk, rate); + if (ret) + return; + + ret = nxp_fspi_clk_prep_enable(f); + if (ret) + return; + + f->selected = spi->chip_select; +} + +static int nxp_fspi_read_ahb(struct nxp_fspi *f, const struct spi_mem_op *op) +{ + u32 start = op->addr.val; + u32 len = op->data.nbytes; + + /* if necessary, ioremap before AHB read */ + if ((!f->ahb_addr) || start < f->memmap_start || + start + len > f->memmap_start + f->memmap_len) { + if (f->ahb_addr) + iounmap(f->ahb_addr); + + f->memmap_start = start; + f->memmap_len = len > NXP_FSPI_MIN_IOMAP ? + len : NXP_FSPI_MIN_IOMAP; + + f->ahb_addr = ioremap(f->memmap_phy + f->memmap_start, + f->memmap_len); + + if (!f->ahb_addr) { + dev_err(f->dev, "failed to alloc memory\n"); + return -ENOMEM; + } + } + + /* Read out the data directly from the AHB buffer. */ + memcpy_fromio(op->data.buf.in, + f->ahb_addr + start - f->memmap_start, len); + + return 0; +} + +static void nxp_fspi_fill_txfifo(struct nxp_fspi *f, + const struct spi_mem_op *op) +{ + void __iomem *base = f->iobase; + int i, ret; + u8 *buf = (u8 *) op->data.buf.out; + + /* clear the TX FIFO. */ + fspi_writel(f, FSPI_IPTXFCR_CLR, base + FSPI_IPTXFCR); + + /* + * Default value of water mark level is 8 bytes, hence in single + * write request controller can write max 8 bytes of data. + */ + + for (i = 0; i < ALIGN_DOWN(op->data.nbytes, 8); i += 8) { + /* Wait for TXFIFO empty */ + ret = fspi_readl_poll_tout(f, f->iobase + FSPI_INTR, + FSPI_INTR_IPTXWE, 0, + POLL_TOUT, true); + WARN_ON(ret); + + fspi_writel(f, *(u32 *) (buf + i), base + FSPI_TFDR); + fspi_writel(f, *(u32 *) (buf + i + 4), base + FSPI_TFDR + 4); + fspi_writel(f, FSPI_INTR_IPTXWE, base + FSPI_INTR); + } + + if (i < op->data.nbytes) { + u32 data = 0; + int j; + /* Wait for TXFIFO empty */ + ret = fspi_readl_poll_tout(f, f->iobase + FSPI_INTR, + FSPI_INTR_IPTXWE, 0, + POLL_TOUT, true); + WARN_ON(ret); + + for (j = 0; j < ALIGN(op->data.nbytes - i, 4); j += 4) { + memcpy(&data, buf + i + j, 4); + fspi_writel(f, data, base + FSPI_TFDR + j); + } + fspi_writel(f, FSPI_INTR_IPTXWE, base + FSPI_INTR); + } +} + +static void nxp_fspi_read_rxfifo(struct nxp_fspi *f, + const struct spi_mem_op *op) +{ + void __iomem *base = f->iobase; + int i, ret; + int len = op->data.nbytes; + u8 *buf = (u8 *) op->data.buf.in; + + /* + * Default value of water mark level is 8 bytes, hence in single + * read request controller can read max 8 bytes of data. + */ + for (i = 0; i < ALIGN_DOWN(len, 8); i += 8) { + /* Wait for RXFIFO available */ + ret = fspi_readl_poll_tout(f, f->iobase + FSPI_INTR, + FSPI_INTR_IPRXWA, 0, + POLL_TOUT, true); + WARN_ON(ret); + + *(u32 *)(buf + i) = fspi_readl(f, base + FSPI_RFDR); + *(u32 *)(buf + i + 4) = fspi_readl(f, base + FSPI_RFDR + 4); + /* move the FIFO pointer */ + fspi_writel(f, FSPI_INTR_IPRXWA, base + FSPI_INTR); + } + + if (i < len) { + u32 tmp; + int size, j; + + buf = op->data.buf.in + i; + /* Wait for RXFIFO available */ + ret = fspi_readl_poll_tout(f, f->iobase + FSPI_INTR, + FSPI_INTR_IPRXWA, 0, + POLL_TOUT, true); + WARN_ON(ret); + + len = op->data.nbytes - i; + for (j = 0; j < op->data.nbytes - i; j += 4) { + tmp = fspi_readl(f, base + FSPI_RFDR + j); + size = min(len, 4); + memcpy(buf + j, &tmp, size); + len -= size; + } + } + + /* invalid the RXFIFO */ + fspi_writel(f, FSPI_IPRXFCR_CLR, base + FSPI_IPRXFCR); + /* move the FIFO pointer */ + fspi_writel(f, FSPI_INTR_IPRXWA, base + FSPI_INTR); +} + +static int nxp_fspi_do_op(struct nxp_fspi *f, const struct spi_mem_op *op) +{ + void __iomem *base = f->iobase; + int seqnum = 0; + int err = 0; + u32 reg; + + reg = fspi_readl(f, base + FSPI_IPRXFCR); + /* invalid RXFIFO first */ + reg &= ~FSPI_IPRXFCR_DMA_EN; + reg = reg | FSPI_IPRXFCR_CLR; + fspi_writel(f, reg, base + FSPI_IPRXFCR); + + init_completion(&f->c); + + fspi_writel(f, op->addr.val, base + FSPI_IPCR0); + /* + * Always start the sequence at the same index since we update + * the LUT at each exec_op() call. And also specify the DATA + * length, since it's has not been specified in the LUT. + */ + fspi_writel(f, op->data.nbytes | + (SEQID_LUT << FSPI_IPCR1_SEQID_SHIFT) | + (seqnum << FSPI_IPCR1_SEQNUM_SHIFT), + base + FSPI_IPCR1); + + /* Trigger the LUT now. */ + fspi_writel(f, FSPI_IPCMD_TRG, base + FSPI_IPCMD); + + /* Wait for the interrupt. */ + if (!wait_for_completion_timeout(&f->c, msecs_to_jiffies(1000))) + err = -ETIMEDOUT; + + /* Invoke IP data read, if request is of data read. */ + if (!err && op->data.nbytes && op->data.dir == SPI_MEM_DATA_IN) + nxp_fspi_read_rxfifo(f, op); + + return err; +} + +static int nxp_fspi_exec_op(struct spi_mem *mem, const struct spi_mem_op *op) +{ + struct nxp_fspi *f = spi_controller_get_devdata(mem->spi->master); + int err = 0; + + mutex_lock(&f->lock); + + /* Wait for controller being ready. */ + err = fspi_readl_poll_tout(f, f->iobase + FSPI_STS0, + FSPI_STS0_ARB_IDLE, 1, POLL_TOUT, true); + WARN_ON(err); + + nxp_fspi_select_mem(f, mem->spi); + + nxp_fspi_prepare_lut(f, op); + /* + * If we have large chunks of data, we read them through the AHB bus + * by accessing the mapped memory. In all other cases we use + * IP commands to access the flash. + */ + if (op->data.nbytes > (f->devtype_data->rxfifo - 4) && + op->data.dir == SPI_MEM_DATA_IN) { + err = nxp_fspi_read_ahb(f, op); + } else { + if (op->data.nbytes && op->data.dir == SPI_MEM_DATA_OUT) + nxp_fspi_fill_txfifo(f, op); + + err = nxp_fspi_do_op(f, op); + } + + /* Invalidate the data in the AHB buffer. */ + nxp_fspi_invalid(f); + + mutex_unlock(&f->lock); + + return err; +} + +static int nxp_fspi_adjust_op_size(struct spi_mem *mem, struct spi_mem_op *op) +{ + struct nxp_fspi *f = spi_controller_get_devdata(mem->spi->master); + + if (op->data.dir == SPI_MEM_DATA_OUT) { + if (op->data.nbytes > f->devtype_data->txfifo) + op->data.nbytes = f->devtype_data->txfifo; + } else { + if (op->data.nbytes > f->devtype_data->ahb_buf_size) + op->data.nbytes = f->devtype_data->ahb_buf_size; + else if (op->data.nbytes > (f->devtype_data->rxfifo - 4)) + op->data.nbytes = ALIGN_DOWN(op->data.nbytes, 8); + } + + return 0; +} + +static int nxp_fspi_default_setup(struct nxp_fspi *f) +{ + void __iomem *base = f->iobase; + int ret, i; + u32 reg; + + /* disable and unprepare clock to avoid glitch pass to controller */ + nxp_fspi_clk_disable_unprep(f); + + /* the default frequency, we will change it later if necessary. */ + ret = clk_set_rate(f->clk, 20000000); + if (ret) + return ret; + + ret = nxp_fspi_clk_prep_enable(f); + if (ret) + return ret; + + /* Reset the module */ + /* w1c register, wait unit clear */ + ret = fspi_readl_poll_tout(f, f->iobase + FSPI_MCR0, + FSPI_MCR0_SWRST, 0, POLL_TOUT, false); + WARN_ON(ret); + + /* Disable the module */ + fspi_writel(f, FSPI_MCR0_MDIS, base + FSPI_MCR0); + + /* Reset the DLL register to default value */ + fspi_writel(f, FSPI_DLLACR_OVRDEN, base + FSPI_DLLACR); + fspi_writel(f, FSPI_DLLBCR_OVRDEN, base + FSPI_DLLBCR); + + /* enable module */ + fspi_writel(f, FSPI_MCR0_AHB_TIMEOUT(0xFF) | + FSPI_MCR0_IP_TIMEOUT(0xFF) | (u32) FSPI_MCR0_OCTCOMB_EN, + base + FSPI_MCR0); + + /* + * Disable same device enable bit and configure all slave devices + * independently. + */ + reg = fspi_readl(f, f->iobase + FSPI_MCR2); + reg = reg & ~(FSPI_MCR2_SAMEDEVICEEN); + fspi_writel(f, reg, base + FSPI_MCR2); + + /* AHB configuration for access buffer 0~7. */ + for (i = 0; i < 7; i++) + fspi_writel(f, 0, base + FSPI_AHBRX_BUF0CR0 + 4 * i); + + /* + * Set ADATSZ with the maximum AHB buffer size to improve the read + * performance. + */ + fspi_writel(f, (f->devtype_data->ahb_buf_size / 8 | + FSPI_AHBRXBUF0CR7_PREF), base + FSPI_AHBRX_BUF7CR0); + + /* prefetch and no start address alignment limitation */ + fspi_writel(f, FSPI_AHBCR_PREF_EN | FSPI_AHBCR_RDADDROPT, + base + FSPI_AHBCR); + + /* Reset the FLSHxCR1 registers. */ + reg = FSPI_FLSHXCR1_TCSH(0x3) | FSPI_FLSHXCR1_TCSS(0x3); + fspi_writel(f, reg, base + FSPI_FLSHA1CR1); + fspi_writel(f, reg, base + FSPI_FLSHA2CR1); + fspi_writel(f, reg, base + FSPI_FLSHB1CR1); + fspi_writel(f, reg, base + FSPI_FLSHB2CR1); + + /* AHB Read - Set lut sequence ID for all CS. */ + fspi_writel(f, SEQID_LUT, base + FSPI_FLSHA1CR2); + fspi_writel(f, SEQID_LUT, base + FSPI_FLSHA2CR2); + fspi_writel(f, SEQID_LUT, base + FSPI_FLSHB1CR2); + fspi_writel(f, SEQID_LUT, base + FSPI_FLSHB2CR2); + + f->selected = -1; + + /* enable the interrupt */ + fspi_writel(f, FSPI_INTEN_IPCMDDONE, base + FSPI_INTEN); + + return 0; +} + +static const char *nxp_fspi_get_name(struct spi_mem *mem) +{ + struct nxp_fspi *f = spi_controller_get_devdata(mem->spi->master); + struct device *dev = &mem->spi->dev; + const char *name; + + // Set custom name derived from the platform_device of the controller. + if (of_get_available_child_count(f->dev->of_node) == 1) + return dev_name(f->dev); + + name = devm_kasprintf(dev, GFP_KERNEL, + "%s-%d", dev_name(f->dev), + mem->spi->chip_select); + + if (!name) { + dev_err(dev, "failed to get memory for custom flash name\n"); + return ERR_PTR(-ENOMEM); + } + + return name; +} + +static const struct spi_controller_mem_ops nxp_fspi_mem_ops = { + .adjust_op_size = nxp_fspi_adjust_op_size, + .supports_op = nxp_fspi_supports_op, + .exec_op = nxp_fspi_exec_op, + .get_name = nxp_fspi_get_name, +}; + +static int nxp_fspi_probe(struct platform_device *pdev) +{ + struct spi_controller *ctlr; + struct device *dev = &pdev->dev; + struct device_node *np = dev->of_node; + struct resource *res; + struct nxp_fspi *f; + int ret; + u32 reg; + + ctlr = spi_alloc_master(&pdev->dev, sizeof(*f)); + if (!ctlr) + return -ENOMEM; + + ctlr->mode_bits = SPI_RX_DUAL | SPI_RX_QUAD | SPI_RX_OCTAL | + SPI_TX_DUAL | SPI_TX_QUAD | SPI_TX_OCTAL; + + f = spi_controller_get_devdata(ctlr); + f->dev = dev; + f->devtype_data = device_get_match_data(dev); + if (!f->devtype_data) { + ret = -ENODEV; + goto err_put_ctrl; + } + + platform_set_drvdata(pdev, f); + + /* find the resources - configuration register address space */ + if (is_acpi_node(f->dev->fwnode)) + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + else + res = platform_get_resource_byname(pdev, + IORESOURCE_MEM, "fspi_base"); + + f->iobase = devm_ioremap_resource(dev, res); + if (IS_ERR(f->iobase)) { + ret = PTR_ERR(f->iobase); + goto err_put_ctrl; + } + + /* find the resources - controller memory mapped space */ + if (is_acpi_node(f->dev->fwnode)) + res = platform_get_resource(pdev, IORESOURCE_MEM, 1); + else + res = platform_get_resource_byname(pdev, + IORESOURCE_MEM, "fspi_mmap"); + + if (!res) { + ret = -ENODEV; + goto err_put_ctrl; + } + + /* assign memory mapped starting address and mapped size. */ + f->memmap_phy = res->start; + f->memmap_phy_size = resource_size(res); + + /* find the clocks */ + if (dev_of_node(&pdev->dev)) { + f->clk_en = devm_clk_get(dev, "fspi_en"); + if (IS_ERR(f->clk_en)) { + ret = PTR_ERR(f->clk_en); + goto err_put_ctrl; + } + + f->clk = devm_clk_get(dev, "fspi"); + if (IS_ERR(f->clk)) { + ret = PTR_ERR(f->clk); + goto err_put_ctrl; + } + + ret = nxp_fspi_clk_prep_enable(f); + if (ret) { + dev_err(dev, "can not enable the clock\n"); + goto err_put_ctrl; + } + } + + /* Clear potential interrupts */ + reg = fspi_readl(f, f->iobase + FSPI_INTR); + if (reg) + fspi_writel(f, reg, f->iobase + FSPI_INTR); + + /* find the irq */ + ret = platform_get_irq(pdev, 0); + if (ret < 0) + goto err_disable_clk; + + ret = devm_request_irq(dev, ret, + nxp_fspi_irq_handler, 0, pdev->name, f); + if (ret) { + dev_err(dev, "failed to request irq: %d\n", ret); + goto err_disable_clk; + } + + mutex_init(&f->lock); + + ctlr->bus_num = -1; + ctlr->num_chipselect = NXP_FSPI_MAX_CHIPSELECT; + ctlr->mem_ops = &nxp_fspi_mem_ops; + + nxp_fspi_default_setup(f); + + ctlr->dev.of_node = np; + + ret = devm_spi_register_controller(&pdev->dev, ctlr); + if (ret) + goto err_destroy_mutex; + + return 0; + +err_destroy_mutex: + mutex_destroy(&f->lock); + +err_disable_clk: + nxp_fspi_clk_disable_unprep(f); + +err_put_ctrl: + spi_controller_put(ctlr); + + dev_err(dev, "NXP FSPI probe failed\n"); + return ret; +} + +static int nxp_fspi_remove(struct platform_device *pdev) +{ + struct nxp_fspi *f = platform_get_drvdata(pdev); + + /* disable the hardware */ + fspi_writel(f, FSPI_MCR0_MDIS, f->iobase + FSPI_MCR0); + + nxp_fspi_clk_disable_unprep(f); + + mutex_destroy(&f->lock); + + if (f->ahb_addr) + iounmap(f->ahb_addr); + + return 0; +} + +static int nxp_fspi_suspend(struct device *dev) +{ + return 0; +} + +static int nxp_fspi_resume(struct device *dev) +{ + struct nxp_fspi *f = dev_get_drvdata(dev); + + nxp_fspi_default_setup(f); + + return 0; +} + +static const struct of_device_id nxp_fspi_dt_ids[] = { + { .compatible = "nxp,lx2160a-fspi", .data = (void *)&lx2160a_data, }, + { .compatible = "nxp,imx8mm-fspi", .data = (void *)&imx8mm_data, }, + { .compatible = "nxp,imx8qxp-fspi", .data = (void *)&imx8qxp_data, }, + { /* sentinel */ } +}; +MODULE_DEVICE_TABLE(of, nxp_fspi_dt_ids); + +#ifdef CONFIG_ACPI +static const struct acpi_device_id nxp_fspi_acpi_ids[] = { + { "NXP0009", .driver_data = (kernel_ulong_t)&lx2160a_data, }, + {} +}; +MODULE_DEVICE_TABLE(acpi, nxp_fspi_acpi_ids); +#endif + +static const struct dev_pm_ops nxp_fspi_pm_ops = { + .suspend = nxp_fspi_suspend, + .resume = nxp_fspi_resume, +}; + +static struct platform_driver nxp_fspi_driver = { + .driver = { + .name = "nxp-fspi", + .of_match_table = nxp_fspi_dt_ids, + .acpi_match_table = ACPI_PTR(nxp_fspi_acpi_ids), + .pm = &nxp_fspi_pm_ops, + }, + .probe = nxp_fspi_probe, + .remove = nxp_fspi_remove, +}; +module_platform_driver(nxp_fspi_driver); + +MODULE_DESCRIPTION("NXP FSPI Controller Driver"); +MODULE_AUTHOR("NXP Semiconductor"); +MODULE_AUTHOR("Yogesh Narayan Gaur <yogeshnarayan.gaur@nxp.com>"); +MODULE_AUTHOR("Boris Brezillon <bbrezillon@kernel.org>"); +MODULE_AUTHOR("Frieder Schrempf <frieder.schrempf@kontron.de>"); +MODULE_LICENSE("GPL v2"); diff --git a/drivers/spi/spi-oc-tiny.c b/drivers/spi/spi-oc-tiny.c new file mode 100644 index 000000000..f3843f0ff --- /dev/null +++ b/drivers/spi/spi-oc-tiny.c @@ -0,0 +1,306 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * OpenCores tiny SPI master driver + * + * https://opencores.org/project,tiny_spi + * + * Copyright (C) 2011 Thomas Chou <thomas@wytron.com.tw> + * + * Based on spi_s3c24xx.c, which is: + * Copyright (c) 2006 Ben Dooks + * Copyright (c) 2006 Simtec Electronics + * Ben Dooks <ben@simtec.co.uk> + */ + +#include <linux/interrupt.h> +#include <linux/errno.h> +#include <linux/module.h> +#include <linux/platform_device.h> +#include <linux/spi/spi.h> +#include <linux/spi/spi_bitbang.h> +#include <linux/spi/spi_oc_tiny.h> +#include <linux/io.h> +#include <linux/of.h> + +#define DRV_NAME "spi_oc_tiny" + +#define TINY_SPI_RXDATA 0 +#define TINY_SPI_TXDATA 4 +#define TINY_SPI_STATUS 8 +#define TINY_SPI_CONTROL 12 +#define TINY_SPI_BAUD 16 + +#define TINY_SPI_STATUS_TXE 0x1 +#define TINY_SPI_STATUS_TXR 0x2 + +struct tiny_spi { + /* bitbang has to be first */ + struct spi_bitbang bitbang; + struct completion done; + + void __iomem *base; + int irq; + unsigned int freq; + unsigned int baudwidth; + unsigned int baud; + unsigned int speed_hz; + unsigned int mode; + unsigned int len; + unsigned int txc, rxc; + const u8 *txp; + u8 *rxp; +}; + +static inline struct tiny_spi *tiny_spi_to_hw(struct spi_device *sdev) +{ + return spi_master_get_devdata(sdev->master); +} + +static unsigned int tiny_spi_baud(struct spi_device *spi, unsigned int hz) +{ + struct tiny_spi *hw = tiny_spi_to_hw(spi); + + return min(DIV_ROUND_UP(hw->freq, hz * 2), (1U << hw->baudwidth)) - 1; +} + +static int tiny_spi_setup_transfer(struct spi_device *spi, + struct spi_transfer *t) +{ + struct tiny_spi *hw = tiny_spi_to_hw(spi); + unsigned int baud = hw->baud; + + if (t) { + if (t->speed_hz && t->speed_hz != hw->speed_hz) + baud = tiny_spi_baud(spi, t->speed_hz); + } + writel(baud, hw->base + TINY_SPI_BAUD); + writel(hw->mode, hw->base + TINY_SPI_CONTROL); + return 0; +} + +static int tiny_spi_setup(struct spi_device *spi) +{ + struct tiny_spi *hw = tiny_spi_to_hw(spi); + + if (spi->max_speed_hz != hw->speed_hz) { + hw->speed_hz = spi->max_speed_hz; + hw->baud = tiny_spi_baud(spi, hw->speed_hz); + } + hw->mode = spi->mode & (SPI_CPOL | SPI_CPHA); + return 0; +} + +static inline void tiny_spi_wait_txr(struct tiny_spi *hw) +{ + while (!(readb(hw->base + TINY_SPI_STATUS) & + TINY_SPI_STATUS_TXR)) + cpu_relax(); +} + +static inline void tiny_spi_wait_txe(struct tiny_spi *hw) +{ + while (!(readb(hw->base + TINY_SPI_STATUS) & + TINY_SPI_STATUS_TXE)) + cpu_relax(); +} + +static int tiny_spi_txrx_bufs(struct spi_device *spi, struct spi_transfer *t) +{ + struct tiny_spi *hw = tiny_spi_to_hw(spi); + const u8 *txp = t->tx_buf; + u8 *rxp = t->rx_buf; + unsigned int i; + + if (hw->irq >= 0) { + /* use interrupt driven data transfer */ + hw->len = t->len; + hw->txp = t->tx_buf; + hw->rxp = t->rx_buf; + hw->txc = 0; + hw->rxc = 0; + + /* send the first byte */ + if (t->len > 1) { + writeb(hw->txp ? *hw->txp++ : 0, + hw->base + TINY_SPI_TXDATA); + hw->txc++; + writeb(hw->txp ? *hw->txp++ : 0, + hw->base + TINY_SPI_TXDATA); + hw->txc++; + writeb(TINY_SPI_STATUS_TXR, hw->base + TINY_SPI_STATUS); + } else { + writeb(hw->txp ? *hw->txp++ : 0, + hw->base + TINY_SPI_TXDATA); + hw->txc++; + writeb(TINY_SPI_STATUS_TXE, hw->base + TINY_SPI_STATUS); + } + + wait_for_completion(&hw->done); + } else { + /* we need to tighten the transfer loop */ + writeb(txp ? *txp++ : 0, hw->base + TINY_SPI_TXDATA); + for (i = 1; i < t->len; i++) { + writeb(txp ? *txp++ : 0, hw->base + TINY_SPI_TXDATA); + + if (rxp || (i != t->len - 1)) + tiny_spi_wait_txr(hw); + if (rxp) + *rxp++ = readb(hw->base + TINY_SPI_TXDATA); + } + tiny_spi_wait_txe(hw); + if (rxp) + *rxp++ = readb(hw->base + TINY_SPI_RXDATA); + } + + return t->len; +} + +static irqreturn_t tiny_spi_irq(int irq, void *dev) +{ + struct tiny_spi *hw = dev; + + writeb(0, hw->base + TINY_SPI_STATUS); + if (hw->rxc + 1 == hw->len) { + if (hw->rxp) + *hw->rxp++ = readb(hw->base + TINY_SPI_RXDATA); + hw->rxc++; + complete(&hw->done); + } else { + if (hw->rxp) + *hw->rxp++ = readb(hw->base + TINY_SPI_TXDATA); + hw->rxc++; + if (hw->txc < hw->len) { + writeb(hw->txp ? *hw->txp++ : 0, + hw->base + TINY_SPI_TXDATA); + hw->txc++; + writeb(TINY_SPI_STATUS_TXR, + hw->base + TINY_SPI_STATUS); + } else { + writeb(TINY_SPI_STATUS_TXE, + hw->base + TINY_SPI_STATUS); + } + } + return IRQ_HANDLED; +} + +#ifdef CONFIG_OF +#include <linux/of_gpio.h> + +static int tiny_spi_of_probe(struct platform_device *pdev) +{ + struct tiny_spi *hw = platform_get_drvdata(pdev); + struct device_node *np = pdev->dev.of_node; + u32 val; + + if (!np) + return 0; + hw->bitbang.master->dev.of_node = pdev->dev.of_node; + if (!of_property_read_u32(np, "clock-frequency", &val)) + hw->freq = val; + if (!of_property_read_u32(np, "baud-width", &val)) + hw->baudwidth = val; + return 0; +} +#else /* !CONFIG_OF */ +static int tiny_spi_of_probe(struct platform_device *pdev) +{ + return 0; +} +#endif /* CONFIG_OF */ + +static int tiny_spi_probe(struct platform_device *pdev) +{ + struct tiny_spi_platform_data *platp = dev_get_platdata(&pdev->dev); + struct tiny_spi *hw; + struct spi_master *master; + int err = -ENODEV; + + master = spi_alloc_master(&pdev->dev, sizeof(struct tiny_spi)); + if (!master) + return err; + + /* setup the master state. */ + master->bus_num = pdev->id; + master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH; + master->setup = tiny_spi_setup; + master->use_gpio_descriptors = true; + + hw = spi_master_get_devdata(master); + platform_set_drvdata(pdev, hw); + + /* setup the state for the bitbang driver */ + hw->bitbang.master = master; + hw->bitbang.setup_transfer = tiny_spi_setup_transfer; + hw->bitbang.txrx_bufs = tiny_spi_txrx_bufs; + + /* find and map our resources */ + hw->base = devm_platform_ioremap_resource(pdev, 0); + if (IS_ERR(hw->base)) { + err = PTR_ERR(hw->base); + goto exit; + } + /* irq is optional */ + hw->irq = platform_get_irq(pdev, 0); + if (hw->irq >= 0) { + init_completion(&hw->done); + err = devm_request_irq(&pdev->dev, hw->irq, tiny_spi_irq, 0, + pdev->name, hw); + if (err) + goto exit; + } + /* find platform data */ + if (platp) { + hw->freq = platp->freq; + hw->baudwidth = platp->baudwidth; + } else { + err = tiny_spi_of_probe(pdev); + if (err) + goto exit; + } + + /* register our spi controller */ + err = spi_bitbang_start(&hw->bitbang); + if (err) + goto exit; + dev_info(&pdev->dev, "base %p, irq %d\n", hw->base, hw->irq); + + return 0; + +exit: + spi_master_put(master); + return err; +} + +static int tiny_spi_remove(struct platform_device *pdev) +{ + struct tiny_spi *hw = platform_get_drvdata(pdev); + struct spi_master *master = hw->bitbang.master; + + spi_bitbang_stop(&hw->bitbang); + spi_master_put(master); + return 0; +} + +#ifdef CONFIG_OF +static const struct of_device_id tiny_spi_match[] = { + { .compatible = "opencores,tiny-spi-rtlsvn2", }, + {}, +}; +MODULE_DEVICE_TABLE(of, tiny_spi_match); +#endif /* CONFIG_OF */ + +static struct platform_driver tiny_spi_driver = { + .probe = tiny_spi_probe, + .remove = tiny_spi_remove, + .driver = { + .name = DRV_NAME, + .pm = NULL, + .of_match_table = of_match_ptr(tiny_spi_match), + }, +}; +module_platform_driver(tiny_spi_driver); + +MODULE_DESCRIPTION("OpenCores tiny SPI driver"); +MODULE_AUTHOR("Thomas Chou <thomas@wytron.com.tw>"); +MODULE_LICENSE("GPL"); +MODULE_ALIAS("platform:" DRV_NAME); diff --git a/drivers/spi/spi-omap-100k.c b/drivers/spi/spi-omap-100k.c new file mode 100644 index 000000000..7c992d1f4 --- /dev/null +++ b/drivers/spi/spi-omap-100k.c @@ -0,0 +1,492 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * OMAP7xx SPI 100k controller driver + * Author: Fabrice Crohas <fcrohas@gmail.com> + * from original omap1_mcspi driver + * + * Copyright (C) 2005, 2006 Nokia Corporation + * Author: Samuel Ortiz <samuel.ortiz@nokia.com> and + * Juha Yrj�l� <juha.yrjola@nokia.com> + */ +#include <linux/kernel.h> +#include <linux/init.h> +#include <linux/interrupt.h> +#include <linux/module.h> +#include <linux/device.h> +#include <linux/delay.h> +#include <linux/platform_device.h> +#include <linux/pm_runtime.h> +#include <linux/err.h> +#include <linux/clk.h> +#include <linux/io.h> +#include <linux/slab.h> + +#include <linux/spi/spi.h> + +#define OMAP1_SPI100K_MAX_FREQ 48000000 + +#define ICR_SPITAS (OMAP7XX_ICR_BASE + 0x12) + +#define SPI_SETUP1 0x00 +#define SPI_SETUP2 0x02 +#define SPI_CTRL 0x04 +#define SPI_STATUS 0x06 +#define SPI_TX_LSB 0x08 +#define SPI_TX_MSB 0x0a +#define SPI_RX_LSB 0x0c +#define SPI_RX_MSB 0x0e + +#define SPI_SETUP1_INT_READ_ENABLE (1UL << 5) +#define SPI_SETUP1_INT_WRITE_ENABLE (1UL << 4) +#define SPI_SETUP1_CLOCK_DIVISOR(x) ((x) << 1) +#define SPI_SETUP1_CLOCK_ENABLE (1UL << 0) + +#define SPI_SETUP2_ACTIVE_EDGE_FALLING (0UL << 0) +#define SPI_SETUP2_ACTIVE_EDGE_RISING (1UL << 0) +#define SPI_SETUP2_NEGATIVE_LEVEL (0UL << 5) +#define SPI_SETUP2_POSITIVE_LEVEL (1UL << 5) +#define SPI_SETUP2_LEVEL_TRIGGER (0UL << 10) +#define SPI_SETUP2_EDGE_TRIGGER (1UL << 10) + +#define SPI_CTRL_SEN(x) ((x) << 7) +#define SPI_CTRL_WORD_SIZE(x) (((x) - 1) << 2) +#define SPI_CTRL_WR (1UL << 1) +#define SPI_CTRL_RD (1UL << 0) + +#define SPI_STATUS_WE (1UL << 1) +#define SPI_STATUS_RD (1UL << 0) + +/* use PIO for small transfers, avoiding DMA setup/teardown overhead and + * cache operations; better heuristics consider wordsize and bitrate. + */ +#define DMA_MIN_BYTES 8 + +#define SPI_RUNNING 0 +#define SPI_SHUTDOWN 1 + +struct omap1_spi100k { + struct clk *ick; + struct clk *fck; + + /* Virtual base address of the controller */ + void __iomem *base; +}; + +struct omap1_spi100k_cs { + void __iomem *base; + int word_len; +}; + +static void spi100k_enable_clock(struct spi_master *master) +{ + unsigned int val; + struct omap1_spi100k *spi100k = spi_master_get_devdata(master); + + /* enable SPI */ + val = readw(spi100k->base + SPI_SETUP1); + val |= SPI_SETUP1_CLOCK_ENABLE; + writew(val, spi100k->base + SPI_SETUP1); +} + +static void spi100k_disable_clock(struct spi_master *master) +{ + unsigned int val; + struct omap1_spi100k *spi100k = spi_master_get_devdata(master); + + /* disable SPI */ + val = readw(spi100k->base + SPI_SETUP1); + val &= ~SPI_SETUP1_CLOCK_ENABLE; + writew(val, spi100k->base + SPI_SETUP1); +} + +static void spi100k_write_data(struct spi_master *master, int len, int data) +{ + struct omap1_spi100k *spi100k = spi_master_get_devdata(master); + + /* write 16-bit word, shifting 8-bit data if necessary */ + if (len <= 8) { + data <<= 8; + len = 16; + } + + spi100k_enable_clock(master); + writew(data , spi100k->base + SPI_TX_MSB); + + writew(SPI_CTRL_SEN(0) | + SPI_CTRL_WORD_SIZE(len) | + SPI_CTRL_WR, + spi100k->base + SPI_CTRL); + + /* Wait for bit ack send change */ + while ((readw(spi100k->base + SPI_STATUS) & SPI_STATUS_WE) != SPI_STATUS_WE) + ; + udelay(1000); + + spi100k_disable_clock(master); +} + +static int spi100k_read_data(struct spi_master *master, int len) +{ + int dataL; + struct omap1_spi100k *spi100k = spi_master_get_devdata(master); + + /* Always do at least 16 bits */ + if (len <= 8) + len = 16; + + spi100k_enable_clock(master); + writew(SPI_CTRL_SEN(0) | + SPI_CTRL_WORD_SIZE(len) | + SPI_CTRL_RD, + spi100k->base + SPI_CTRL); + + while ((readw(spi100k->base + SPI_STATUS) & SPI_STATUS_RD) != SPI_STATUS_RD) + ; + udelay(1000); + + dataL = readw(spi100k->base + SPI_RX_LSB); + readw(spi100k->base + SPI_RX_MSB); + spi100k_disable_clock(master); + + return dataL; +} + +static void spi100k_open(struct spi_master *master) +{ + /* get control of SPI */ + struct omap1_spi100k *spi100k = spi_master_get_devdata(master); + + writew(SPI_SETUP1_INT_READ_ENABLE | + SPI_SETUP1_INT_WRITE_ENABLE | + SPI_SETUP1_CLOCK_DIVISOR(0), spi100k->base + SPI_SETUP1); + + /* configure clock and interrupts */ + writew(SPI_SETUP2_ACTIVE_EDGE_FALLING | + SPI_SETUP2_NEGATIVE_LEVEL | + SPI_SETUP2_LEVEL_TRIGGER, spi100k->base + SPI_SETUP2); +} + +static void omap1_spi100k_force_cs(struct omap1_spi100k *spi100k, int enable) +{ + if (enable) + writew(0x05fc, spi100k->base + SPI_CTRL); + else + writew(0x05fd, spi100k->base + SPI_CTRL); +} + +static unsigned +omap1_spi100k_txrx_pio(struct spi_device *spi, struct spi_transfer *xfer) +{ + struct omap1_spi100k_cs *cs = spi->controller_state; + unsigned int count, c; + int word_len; + + count = xfer->len; + c = count; + word_len = cs->word_len; + + if (word_len <= 8) { + u8 *rx; + const u8 *tx; + + rx = xfer->rx_buf; + tx = xfer->tx_buf; + do { + c -= 1; + if (xfer->tx_buf != NULL) + spi100k_write_data(spi->master, word_len, *tx++); + if (xfer->rx_buf != NULL) + *rx++ = spi100k_read_data(spi->master, word_len); + } while (c); + } else if (word_len <= 16) { + u16 *rx; + const u16 *tx; + + rx = xfer->rx_buf; + tx = xfer->tx_buf; + do { + c -= 2; + if (xfer->tx_buf != NULL) + spi100k_write_data(spi->master, word_len, *tx++); + if (xfer->rx_buf != NULL) + *rx++ = spi100k_read_data(spi->master, word_len); + } while (c); + } else if (word_len <= 32) { + u32 *rx; + const u32 *tx; + + rx = xfer->rx_buf; + tx = xfer->tx_buf; + do { + c -= 4; + if (xfer->tx_buf != NULL) + spi100k_write_data(spi->master, word_len, *tx); + if (xfer->rx_buf != NULL) + *rx = spi100k_read_data(spi->master, word_len); + } while (c); + } + return count - c; +} + +/* called only when no transfer is active to this device */ +static int omap1_spi100k_setup_transfer(struct spi_device *spi, + struct spi_transfer *t) +{ + struct omap1_spi100k *spi100k = spi_master_get_devdata(spi->master); + struct omap1_spi100k_cs *cs = spi->controller_state; + u8 word_len; + + if (t != NULL) + word_len = t->bits_per_word; + else + word_len = spi->bits_per_word; + + if (word_len > 32) + return -EINVAL; + cs->word_len = word_len; + + /* SPI init before transfer */ + writew(0x3e , spi100k->base + SPI_SETUP1); + writew(0x00 , spi100k->base + SPI_STATUS); + writew(0x3e , spi100k->base + SPI_CTRL); + + return 0; +} + +/* the spi->mode bits understood by this driver: */ +#define MODEBITS (SPI_CPOL | SPI_CPHA | SPI_CS_HIGH) + +static int omap1_spi100k_setup(struct spi_device *spi) +{ + int ret; + struct omap1_spi100k *spi100k; + struct omap1_spi100k_cs *cs = spi->controller_state; + + spi100k = spi_master_get_devdata(spi->master); + + if (!cs) { + cs = devm_kzalloc(&spi->dev, sizeof(*cs), GFP_KERNEL); + if (!cs) + return -ENOMEM; + cs->base = spi100k->base + spi->chip_select * 0x14; + spi->controller_state = cs; + } + + spi100k_open(spi->master); + + clk_prepare_enable(spi100k->ick); + clk_prepare_enable(spi100k->fck); + + ret = omap1_spi100k_setup_transfer(spi, NULL); + + clk_disable_unprepare(spi100k->ick); + clk_disable_unprepare(spi100k->fck); + + return ret; +} + +static int omap1_spi100k_transfer_one_message(struct spi_master *master, + struct spi_message *m) +{ + struct omap1_spi100k *spi100k = spi_master_get_devdata(master); + struct spi_device *spi = m->spi; + struct spi_transfer *t = NULL; + int cs_active = 0; + int status = 0; + + list_for_each_entry(t, &m->transfers, transfer_list) { + if (t->tx_buf == NULL && t->rx_buf == NULL && t->len) { + status = -EINVAL; + break; + } + status = omap1_spi100k_setup_transfer(spi, t); + if (status < 0) + break; + + if (!cs_active) { + omap1_spi100k_force_cs(spi100k, 1); + cs_active = 1; + } + + if (t->len) { + unsigned count; + + count = omap1_spi100k_txrx_pio(spi, t); + m->actual_length += count; + + if (count != t->len) { + status = -EIO; + break; + } + } + + spi_transfer_delay_exec(t); + + /* ignore the "leave it on after last xfer" hint */ + + if (t->cs_change) { + omap1_spi100k_force_cs(spi100k, 0); + cs_active = 0; + } + } + + status = omap1_spi100k_setup_transfer(spi, NULL); + + if (cs_active) + omap1_spi100k_force_cs(spi100k, 0); + + m->status = status; + + spi_finalize_current_message(master); + + return status; +} + +static int omap1_spi100k_probe(struct platform_device *pdev) +{ + struct spi_master *master; + struct omap1_spi100k *spi100k; + int status = 0; + + if (!pdev->id) + return -EINVAL; + + master = spi_alloc_master(&pdev->dev, sizeof(*spi100k)); + if (master == NULL) { + dev_dbg(&pdev->dev, "master allocation failed\n"); + return -ENOMEM; + } + + if (pdev->id != -1) + master->bus_num = pdev->id; + + master->setup = omap1_spi100k_setup; + master->transfer_one_message = omap1_spi100k_transfer_one_message; + master->num_chipselect = 2; + master->mode_bits = MODEBITS; + master->bits_per_word_mask = SPI_BPW_RANGE_MASK(4, 32); + master->min_speed_hz = OMAP1_SPI100K_MAX_FREQ/(1<<16); + master->max_speed_hz = OMAP1_SPI100K_MAX_FREQ; + master->auto_runtime_pm = true; + + spi100k = spi_master_get_devdata(master); + + /* + * The memory region base address is taken as the platform_data. + * You should allocate this with ioremap() before initializing + * the SPI. + */ + spi100k->base = (void __iomem *)dev_get_platdata(&pdev->dev); + + spi100k->ick = devm_clk_get(&pdev->dev, "ick"); + if (IS_ERR(spi100k->ick)) { + dev_dbg(&pdev->dev, "can't get spi100k_ick\n"); + status = PTR_ERR(spi100k->ick); + goto err; + } + + spi100k->fck = devm_clk_get(&pdev->dev, "fck"); + if (IS_ERR(spi100k->fck)) { + dev_dbg(&pdev->dev, "can't get spi100k_fck\n"); + status = PTR_ERR(spi100k->fck); + goto err; + } + + status = clk_prepare_enable(spi100k->ick); + if (status != 0) { + dev_err(&pdev->dev, "failed to enable ick: %d\n", status); + goto err; + } + + status = clk_prepare_enable(spi100k->fck); + if (status != 0) { + dev_err(&pdev->dev, "failed to enable fck: %d\n", status); + goto err_ick; + } + + pm_runtime_enable(&pdev->dev); + pm_runtime_set_active(&pdev->dev); + + status = devm_spi_register_master(&pdev->dev, master); + if (status < 0) + goto err_fck; + + return status; + +err_fck: + pm_runtime_disable(&pdev->dev); + clk_disable_unprepare(spi100k->fck); +err_ick: + clk_disable_unprepare(spi100k->ick); +err: + spi_master_put(master); + return status; +} + +static int omap1_spi100k_remove(struct platform_device *pdev) +{ + struct spi_master *master = platform_get_drvdata(pdev); + struct omap1_spi100k *spi100k = spi_master_get_devdata(master); + + pm_runtime_disable(&pdev->dev); + + clk_disable_unprepare(spi100k->fck); + clk_disable_unprepare(spi100k->ick); + + return 0; +} + +#ifdef CONFIG_PM +static int omap1_spi100k_runtime_suspend(struct device *dev) +{ + struct spi_master *master = dev_get_drvdata(dev); + struct omap1_spi100k *spi100k = spi_master_get_devdata(master); + + clk_disable_unprepare(spi100k->ick); + clk_disable_unprepare(spi100k->fck); + + return 0; +} + +static int omap1_spi100k_runtime_resume(struct device *dev) +{ + struct spi_master *master = dev_get_drvdata(dev); + struct omap1_spi100k *spi100k = spi_master_get_devdata(master); + int ret; + + ret = clk_prepare_enable(spi100k->ick); + if (ret != 0) { + dev_err(dev, "Failed to enable ick: %d\n", ret); + return ret; + } + + ret = clk_prepare_enable(spi100k->fck); + if (ret != 0) { + dev_err(dev, "Failed to enable fck: %d\n", ret); + clk_disable_unprepare(spi100k->ick); + return ret; + } + + return 0; +} +#endif + +static const struct dev_pm_ops omap1_spi100k_pm = { + SET_RUNTIME_PM_OPS(omap1_spi100k_runtime_suspend, + omap1_spi100k_runtime_resume, NULL) +}; + +static struct platform_driver omap1_spi100k_driver = { + .driver = { + .name = "omap1_spi100k", + .pm = &omap1_spi100k_pm, + }, + .probe = omap1_spi100k_probe, + .remove = omap1_spi100k_remove, +}; + +module_platform_driver(omap1_spi100k_driver); + +MODULE_DESCRIPTION("OMAP7xx SPI 100k controller driver"); +MODULE_AUTHOR("Fabrice Crohas <fcrohas@gmail.com>"); +MODULE_LICENSE("GPL"); diff --git a/drivers/spi/spi-omap-uwire.c b/drivers/spi/spi-omap-uwire.c new file mode 100644 index 000000000..df28c6664 --- /dev/null +++ b/drivers/spi/spi-omap-uwire.c @@ -0,0 +1,569 @@ +/* + * MicroWire interface driver for OMAP + * + * Copyright 2003 MontaVista Software Inc. <source@mvista.com> + * + * Ported to 2.6 OMAP uwire interface. + * Copyright (C) 2004 Texas Instruments. + * + * Generalization patches by Juha Yrjola <juha.yrjola@nokia.com> + * + * Copyright (C) 2005 David Brownell (ported to 2.6 SPI interface) + * Copyright (C) 2006 Nokia + * + * Many updates by Imre Deak <imre.deak@nokia.com> + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License as published by the + * Free Software Foundation; either version 2 of the License, or (at your + * option) any later version. + * + * THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED + * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF + * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. + * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, + * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT + * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF + * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON + * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF + * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + */ +#include <linux/kernel.h> +#include <linux/init.h> +#include <linux/delay.h> +#include <linux/platform_device.h> +#include <linux/interrupt.h> +#include <linux/err.h> +#include <linux/clk.h> +#include <linux/slab.h> +#include <linux/device.h> + +#include <linux/spi/spi.h> +#include <linux/spi/spi_bitbang.h> +#include <linux/module.h> +#include <linux/io.h> + +#include <mach/hardware.h> +#include <asm/mach-types.h> + +#include <mach/mux.h> + +#include <mach/omap7xx.h> /* OMAP7XX_IO_CONF registers */ + + +/* FIXME address is now a platform device resource, + * and irqs should show there too... + */ +#define UWIRE_BASE_PHYS 0xFFFB3000 + +/* uWire Registers: */ +#define UWIRE_IO_SIZE 0x20 +#define UWIRE_TDR 0x00 +#define UWIRE_RDR 0x00 +#define UWIRE_CSR 0x01 +#define UWIRE_SR1 0x02 +#define UWIRE_SR2 0x03 +#define UWIRE_SR3 0x04 +#define UWIRE_SR4 0x05 +#define UWIRE_SR5 0x06 + +/* CSR bits */ +#define RDRB (1 << 15) +#define CSRB (1 << 14) +#define START (1 << 13) +#define CS_CMD (1 << 12) + +/* SR1 or SR2 bits */ +#define UWIRE_READ_FALLING_EDGE 0x0001 +#define UWIRE_READ_RISING_EDGE 0x0000 +#define UWIRE_WRITE_FALLING_EDGE 0x0000 +#define UWIRE_WRITE_RISING_EDGE 0x0002 +#define UWIRE_CS_ACTIVE_LOW 0x0000 +#define UWIRE_CS_ACTIVE_HIGH 0x0004 +#define UWIRE_FREQ_DIV_2 0x0000 +#define UWIRE_FREQ_DIV_4 0x0008 +#define UWIRE_FREQ_DIV_8 0x0010 +#define UWIRE_CHK_READY 0x0020 +#define UWIRE_CLK_INVERTED 0x0040 + + +struct uwire_spi { + struct spi_bitbang bitbang; + struct clk *ck; +}; + +struct uwire_state { + unsigned div1_idx; +}; + +/* REVISIT compile time constant for idx_shift? */ +/* + * Or, put it in a structure which is used throughout the driver; + * that avoids having to issue two loads for each bit of static data. + */ +static unsigned int uwire_idx_shift; +static void __iomem *uwire_base; + +static inline void uwire_write_reg(int idx, u16 val) +{ + __raw_writew(val, uwire_base + (idx << uwire_idx_shift)); +} + +static inline u16 uwire_read_reg(int idx) +{ + return __raw_readw(uwire_base + (idx << uwire_idx_shift)); +} + +static inline void omap_uwire_configure_mode(u8 cs, unsigned long flags) +{ + u16 w, val = 0; + int shift, reg; + + if (flags & UWIRE_CLK_INVERTED) + val ^= 0x03; + val = flags & 0x3f; + if (cs & 1) + shift = 6; + else + shift = 0; + if (cs <= 1) + reg = UWIRE_SR1; + else + reg = UWIRE_SR2; + + w = uwire_read_reg(reg); + w &= ~(0x3f << shift); + w |= val << shift; + uwire_write_reg(reg, w); +} + +static int wait_uwire_csr_flag(u16 mask, u16 val, int might_not_catch) +{ + u16 w; + int c = 0; + unsigned long max_jiffies = jiffies + HZ; + + for (;;) { + w = uwire_read_reg(UWIRE_CSR); + if ((w & mask) == val) + break; + if (time_after(jiffies, max_jiffies)) { + printk(KERN_ERR "%s: timeout. reg=%#06x " + "mask=%#06x val=%#06x\n", + __func__, w, mask, val); + return -1; + } + c++; + if (might_not_catch && c > 64) + break; + } + return 0; +} + +static void uwire_set_clk1_div(int div1_idx) +{ + u16 w; + + w = uwire_read_reg(UWIRE_SR3); + w &= ~(0x03 << 1); + w |= div1_idx << 1; + uwire_write_reg(UWIRE_SR3, w); +} + +static void uwire_chipselect(struct spi_device *spi, int value) +{ + struct uwire_state *ust = spi->controller_state; + u16 w; + int old_cs; + + + BUG_ON(wait_uwire_csr_flag(CSRB, 0, 0)); + + w = uwire_read_reg(UWIRE_CSR); + old_cs = (w >> 10) & 0x03; + if (value == BITBANG_CS_INACTIVE || old_cs != spi->chip_select) { + /* Deselect this CS, or the previous CS */ + w &= ~CS_CMD; + uwire_write_reg(UWIRE_CSR, w); + } + /* activate specfied chipselect */ + if (value == BITBANG_CS_ACTIVE) { + uwire_set_clk1_div(ust->div1_idx); + /* invert clock? */ + if (spi->mode & SPI_CPOL) + uwire_write_reg(UWIRE_SR4, 1); + else + uwire_write_reg(UWIRE_SR4, 0); + + w = spi->chip_select << 10; + w |= CS_CMD; + uwire_write_reg(UWIRE_CSR, w); + } +} + +static int uwire_txrx(struct spi_device *spi, struct spi_transfer *t) +{ + unsigned len = t->len; + unsigned bits = t->bits_per_word; + unsigned bytes; + u16 val, w; + int status = 0; + + if (!t->tx_buf && !t->rx_buf) + return 0; + + w = spi->chip_select << 10; + w |= CS_CMD; + + if (t->tx_buf) { + const u8 *buf = t->tx_buf; + + /* NOTE: DMA could be used for TX transfers */ + + /* write one or two bytes at a time */ + while (len >= 1) { + /* tx bit 15 is first sent; we byteswap multibyte words + * (msb-first) on the way out from memory. + */ + val = *buf++; + if (bits > 8) { + bytes = 2; + val |= *buf++ << 8; + } else + bytes = 1; + val <<= 16 - bits; + +#ifdef VERBOSE + pr_debug("%s: write-%d =%04x\n", + dev_name(&spi->dev), bits, val); +#endif + if (wait_uwire_csr_flag(CSRB, 0, 0)) + goto eio; + + uwire_write_reg(UWIRE_TDR, val); + + /* start write */ + val = START | w | (bits << 5); + + uwire_write_reg(UWIRE_CSR, val); + len -= bytes; + + /* Wait till write actually starts. + * This is needed with MPU clock 60+ MHz. + * REVISIT: we may not have time to catch it... + */ + if (wait_uwire_csr_flag(CSRB, CSRB, 1)) + goto eio; + + status += bytes; + } + + /* REVISIT: save this for later to get more i/o overlap */ + if (wait_uwire_csr_flag(CSRB, 0, 0)) + goto eio; + + } else if (t->rx_buf) { + u8 *buf = t->rx_buf; + + /* read one or two bytes at a time */ + while (len) { + if (bits > 8) { + bytes = 2; + } else + bytes = 1; + + /* start read */ + val = START | w | (bits << 0); + uwire_write_reg(UWIRE_CSR, val); + len -= bytes; + + /* Wait till read actually starts */ + (void) wait_uwire_csr_flag(CSRB, CSRB, 1); + + if (wait_uwire_csr_flag(RDRB | CSRB, + RDRB, 0)) + goto eio; + + /* rx bit 0 is last received; multibyte words will + * be properly byteswapped on the way to memory. + */ + val = uwire_read_reg(UWIRE_RDR); + val &= (1 << bits) - 1; + *buf++ = (u8) val; + if (bytes == 2) + *buf++ = val >> 8; + status += bytes; +#ifdef VERBOSE + pr_debug("%s: read-%d =%04x\n", + dev_name(&spi->dev), bits, val); +#endif + + } + } + return status; +eio: + return -EIO; +} + +static int uwire_setup_transfer(struct spi_device *spi, struct spi_transfer *t) +{ + struct uwire_state *ust = spi->controller_state; + struct uwire_spi *uwire; + unsigned flags = 0; + unsigned hz; + unsigned long rate; + int div1_idx; + int div1; + int div2; + int status; + + uwire = spi_master_get_devdata(spi->master); + + /* mode 0..3, clock inverted separately; + * standard nCS signaling; + * don't treat DI=high as "not ready" + */ + if (spi->mode & SPI_CS_HIGH) + flags |= UWIRE_CS_ACTIVE_HIGH; + + if (spi->mode & SPI_CPOL) + flags |= UWIRE_CLK_INVERTED; + + switch (spi->mode & (SPI_CPOL | SPI_CPHA)) { + case SPI_MODE_0: + case SPI_MODE_3: + flags |= UWIRE_WRITE_FALLING_EDGE | UWIRE_READ_RISING_EDGE; + break; + case SPI_MODE_1: + case SPI_MODE_2: + flags |= UWIRE_WRITE_RISING_EDGE | UWIRE_READ_FALLING_EDGE; + break; + } + + /* assume it's already enabled */ + rate = clk_get_rate(uwire->ck); + + if (t != NULL) + hz = t->speed_hz; + else + hz = spi->max_speed_hz; + + if (!hz) { + pr_debug("%s: zero speed?\n", dev_name(&spi->dev)); + status = -EINVAL; + goto done; + } + + /* F_INT = mpu_xor_clk / DIV1 */ + for (div1_idx = 0; div1_idx < 4; div1_idx++) { + switch (div1_idx) { + case 0: + div1 = 2; + break; + case 1: + div1 = 4; + break; + case 2: + div1 = 7; + break; + default: + case 3: + div1 = 10; + break; + } + div2 = (rate / div1 + hz - 1) / hz; + if (div2 <= 8) + break; + } + if (div1_idx == 4) { + pr_debug("%s: lowest clock %ld, need %d\n", + dev_name(&spi->dev), rate / 10 / 8, hz); + status = -EDOM; + goto done; + } + + /* we have to cache this and reset in uwire_chipselect as this is a + * global parameter and another uwire device can change it under + * us */ + ust->div1_idx = div1_idx; + uwire_set_clk1_div(div1_idx); + + rate /= div1; + + switch (div2) { + case 0: + case 1: + case 2: + flags |= UWIRE_FREQ_DIV_2; + rate /= 2; + break; + case 3: + case 4: + flags |= UWIRE_FREQ_DIV_4; + rate /= 4; + break; + case 5: + case 6: + case 7: + case 8: + flags |= UWIRE_FREQ_DIV_8; + rate /= 8; + break; + } + omap_uwire_configure_mode(spi->chip_select, flags); + pr_debug("%s: uwire flags %02x, armxor %lu KHz, SCK %lu KHz\n", + __func__, flags, + clk_get_rate(uwire->ck) / 1000, + rate / 1000); + status = 0; +done: + return status; +} + +static int uwire_setup(struct spi_device *spi) +{ + struct uwire_state *ust = spi->controller_state; + bool initial_setup = false; + int status; + + if (ust == NULL) { + ust = kzalloc(sizeof(*ust), GFP_KERNEL); + if (ust == NULL) + return -ENOMEM; + spi->controller_state = ust; + initial_setup = true; + } + + status = uwire_setup_transfer(spi, NULL); + if (status && initial_setup) + kfree(ust); + + return status; +} + +static void uwire_cleanup(struct spi_device *spi) +{ + kfree(spi->controller_state); +} + +static void uwire_off(struct uwire_spi *uwire) +{ + uwire_write_reg(UWIRE_SR3, 0); + clk_disable_unprepare(uwire->ck); + spi_master_put(uwire->bitbang.master); +} + +static int uwire_probe(struct platform_device *pdev) +{ + struct spi_master *master; + struct uwire_spi *uwire; + int status; + + master = spi_alloc_master(&pdev->dev, sizeof *uwire); + if (!master) + return -ENODEV; + + uwire = spi_master_get_devdata(master); + + uwire_base = devm_ioremap(&pdev->dev, UWIRE_BASE_PHYS, UWIRE_IO_SIZE); + if (!uwire_base) { + dev_dbg(&pdev->dev, "can't ioremap UWIRE\n"); + spi_master_put(master); + return -ENOMEM; + } + + platform_set_drvdata(pdev, uwire); + + uwire->ck = devm_clk_get(&pdev->dev, "fck"); + if (IS_ERR(uwire->ck)) { + status = PTR_ERR(uwire->ck); + dev_dbg(&pdev->dev, "no functional clock?\n"); + spi_master_put(master); + return status; + } + clk_prepare_enable(uwire->ck); + + if (cpu_is_omap7xx()) + uwire_idx_shift = 1; + else + uwire_idx_shift = 2; + + uwire_write_reg(UWIRE_SR3, 1); + + /* the spi->mode bits understood by this driver: */ + master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH; + master->bits_per_word_mask = SPI_BPW_RANGE_MASK(1, 16); + master->flags = SPI_MASTER_HALF_DUPLEX; + + master->bus_num = 2; /* "official" */ + master->num_chipselect = 4; + master->setup = uwire_setup; + master->cleanup = uwire_cleanup; + + uwire->bitbang.master = master; + uwire->bitbang.chipselect = uwire_chipselect; + uwire->bitbang.setup_transfer = uwire_setup_transfer; + uwire->bitbang.txrx_bufs = uwire_txrx; + + status = spi_bitbang_start(&uwire->bitbang); + if (status < 0) { + uwire_off(uwire); + } + return status; +} + +static int uwire_remove(struct platform_device *pdev) +{ + struct uwire_spi *uwire = platform_get_drvdata(pdev); + + // FIXME remove all child devices, somewhere ... + + spi_bitbang_stop(&uwire->bitbang); + uwire_off(uwire); + return 0; +} + +/* work with hotplug and coldplug */ +MODULE_ALIAS("platform:omap_uwire"); + +static struct platform_driver uwire_driver = { + .driver = { + .name = "omap_uwire", + }, + .probe = uwire_probe, + .remove = uwire_remove, + // suspend ... unuse ck + // resume ... use ck +}; + +static int __init omap_uwire_init(void) +{ + /* FIXME move these into the relevant board init code. also, include + * H3 support; it uses tsc2101 like H2 (on a different chipselect). + */ + + if (machine_is_omap_h2()) { + /* defaults: W21 SDO, U18 SDI, V19 SCL */ + omap_cfg_reg(N14_1610_UWIRE_CS0); + omap_cfg_reg(N15_1610_UWIRE_CS1); + } + if (machine_is_omap_perseus2()) { + /* configure pins: MPU_UW_nSCS1, MPU_UW_SDO, MPU_UW_SCLK */ + int val = omap_readl(OMAP7XX_IO_CONF_9) & ~0x00EEE000; + omap_writel(val | 0x00AAA000, OMAP7XX_IO_CONF_9); + } + + return platform_driver_register(&uwire_driver); +} + +static void __exit omap_uwire_exit(void) +{ + platform_driver_unregister(&uwire_driver); +} + +subsys_initcall(omap_uwire_init); +module_exit(omap_uwire_exit); + +MODULE_LICENSE("GPL"); + diff --git a/drivers/spi/spi-omap2-mcspi.c b/drivers/spi/spi-omap2-mcspi.c new file mode 100644 index 000000000..3596bbe4b --- /dev/null +++ b/drivers/spi/spi-omap2-mcspi.c @@ -0,0 +1,1606 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * OMAP2 McSPI controller driver + * + * Copyright (C) 2005, 2006 Nokia Corporation + * Author: Samuel Ortiz <samuel.ortiz@nokia.com> and + * Juha Yrj�l� <juha.yrjola@nokia.com> + */ + +#include <linux/kernel.h> +#include <linux/interrupt.h> +#include <linux/module.h> +#include <linux/device.h> +#include <linux/delay.h> +#include <linux/dma-mapping.h> +#include <linux/dmaengine.h> +#include <linux/pinctrl/consumer.h> +#include <linux/platform_device.h> +#include <linux/err.h> +#include <linux/clk.h> +#include <linux/io.h> +#include <linux/slab.h> +#include <linux/pm_runtime.h> +#include <linux/of.h> +#include <linux/of_device.h> +#include <linux/gcd.h> + +#include <linux/spi/spi.h> + +#include <linux/platform_data/spi-omap2-mcspi.h> + +#define OMAP2_MCSPI_MAX_FREQ 48000000 +#define OMAP2_MCSPI_MAX_DIVIDER 4096 +#define OMAP2_MCSPI_MAX_FIFODEPTH 64 +#define OMAP2_MCSPI_MAX_FIFOWCNT 0xFFFF +#define SPI_AUTOSUSPEND_TIMEOUT 2000 + +#define OMAP2_MCSPI_REVISION 0x00 +#define OMAP2_MCSPI_SYSSTATUS 0x14 +#define OMAP2_MCSPI_IRQSTATUS 0x18 +#define OMAP2_MCSPI_IRQENABLE 0x1c +#define OMAP2_MCSPI_WAKEUPENABLE 0x20 +#define OMAP2_MCSPI_SYST 0x24 +#define OMAP2_MCSPI_MODULCTRL 0x28 +#define OMAP2_MCSPI_XFERLEVEL 0x7c + +/* per-channel banks, 0x14 bytes each, first is: */ +#define OMAP2_MCSPI_CHCONF0 0x2c +#define OMAP2_MCSPI_CHSTAT0 0x30 +#define OMAP2_MCSPI_CHCTRL0 0x34 +#define OMAP2_MCSPI_TX0 0x38 +#define OMAP2_MCSPI_RX0 0x3c + +/* per-register bitmasks: */ +#define OMAP2_MCSPI_IRQSTATUS_EOW BIT(17) + +#define OMAP2_MCSPI_MODULCTRL_SINGLE BIT(0) +#define OMAP2_MCSPI_MODULCTRL_MS BIT(2) +#define OMAP2_MCSPI_MODULCTRL_STEST BIT(3) + +#define OMAP2_MCSPI_CHCONF_PHA BIT(0) +#define OMAP2_MCSPI_CHCONF_POL BIT(1) +#define OMAP2_MCSPI_CHCONF_CLKD_MASK (0x0f << 2) +#define OMAP2_MCSPI_CHCONF_EPOL BIT(6) +#define OMAP2_MCSPI_CHCONF_WL_MASK (0x1f << 7) +#define OMAP2_MCSPI_CHCONF_TRM_RX_ONLY BIT(12) +#define OMAP2_MCSPI_CHCONF_TRM_TX_ONLY BIT(13) +#define OMAP2_MCSPI_CHCONF_TRM_MASK (0x03 << 12) +#define OMAP2_MCSPI_CHCONF_DMAW BIT(14) +#define OMAP2_MCSPI_CHCONF_DMAR BIT(15) +#define OMAP2_MCSPI_CHCONF_DPE0 BIT(16) +#define OMAP2_MCSPI_CHCONF_DPE1 BIT(17) +#define OMAP2_MCSPI_CHCONF_IS BIT(18) +#define OMAP2_MCSPI_CHCONF_TURBO BIT(19) +#define OMAP2_MCSPI_CHCONF_FORCE BIT(20) +#define OMAP2_MCSPI_CHCONF_FFET BIT(27) +#define OMAP2_MCSPI_CHCONF_FFER BIT(28) +#define OMAP2_MCSPI_CHCONF_CLKG BIT(29) + +#define OMAP2_MCSPI_CHSTAT_RXS BIT(0) +#define OMAP2_MCSPI_CHSTAT_TXS BIT(1) +#define OMAP2_MCSPI_CHSTAT_EOT BIT(2) +#define OMAP2_MCSPI_CHSTAT_TXFFE BIT(3) + +#define OMAP2_MCSPI_CHCTRL_EN BIT(0) +#define OMAP2_MCSPI_CHCTRL_EXTCLK_MASK (0xff << 8) + +#define OMAP2_MCSPI_WAKEUPENABLE_WKEN BIT(0) + +/* We have 2 DMA channels per CS, one for RX and one for TX */ +struct omap2_mcspi_dma { + struct dma_chan *dma_tx; + struct dma_chan *dma_rx; + + struct completion dma_tx_completion; + struct completion dma_rx_completion; + + char dma_rx_ch_name[14]; + char dma_tx_ch_name[14]; +}; + +/* use PIO for small transfers, avoiding DMA setup/teardown overhead and + * cache operations; better heuristics consider wordsize and bitrate. + */ +#define DMA_MIN_BYTES 160 + + +/* + * Used for context save and restore, structure members to be updated whenever + * corresponding registers are modified. + */ +struct omap2_mcspi_regs { + u32 modulctrl; + u32 wakeupenable; + struct list_head cs; +}; + +struct omap2_mcspi { + struct completion txdone; + struct spi_master *master; + /* Virtual base address of the controller */ + void __iomem *base; + unsigned long phys; + /* SPI1 has 4 channels, while SPI2 has 2 */ + struct omap2_mcspi_dma *dma_channels; + struct device *dev; + struct omap2_mcspi_regs ctx; + int fifo_depth; + bool slave_aborted; + unsigned int pin_dir:1; + size_t max_xfer_len; +}; + +struct omap2_mcspi_cs { + void __iomem *base; + unsigned long phys; + int word_len; + u16 mode; + struct list_head node; + /* Context save and restore shadow register */ + u32 chconf0, chctrl0; +}; + +static inline void mcspi_write_reg(struct spi_master *master, + int idx, u32 val) +{ + struct omap2_mcspi *mcspi = spi_master_get_devdata(master); + + writel_relaxed(val, mcspi->base + idx); +} + +static inline u32 mcspi_read_reg(struct spi_master *master, int idx) +{ + struct omap2_mcspi *mcspi = spi_master_get_devdata(master); + + return readl_relaxed(mcspi->base + idx); +} + +static inline void mcspi_write_cs_reg(const struct spi_device *spi, + int idx, u32 val) +{ + struct omap2_mcspi_cs *cs = spi->controller_state; + + writel_relaxed(val, cs->base + idx); +} + +static inline u32 mcspi_read_cs_reg(const struct spi_device *spi, int idx) +{ + struct omap2_mcspi_cs *cs = spi->controller_state; + + return readl_relaxed(cs->base + idx); +} + +static inline u32 mcspi_cached_chconf0(const struct spi_device *spi) +{ + struct omap2_mcspi_cs *cs = spi->controller_state; + + return cs->chconf0; +} + +static inline void mcspi_write_chconf0(const struct spi_device *spi, u32 val) +{ + struct omap2_mcspi_cs *cs = spi->controller_state; + + cs->chconf0 = val; + mcspi_write_cs_reg(spi, OMAP2_MCSPI_CHCONF0, val); + mcspi_read_cs_reg(spi, OMAP2_MCSPI_CHCONF0); +} + +static inline int mcspi_bytes_per_word(int word_len) +{ + if (word_len <= 8) + return 1; + else if (word_len <= 16) + return 2; + else /* word_len <= 32 */ + return 4; +} + +static void omap2_mcspi_set_dma_req(const struct spi_device *spi, + int is_read, int enable) +{ + u32 l, rw; + + l = mcspi_cached_chconf0(spi); + + if (is_read) /* 1 is read, 0 write */ + rw = OMAP2_MCSPI_CHCONF_DMAR; + else + rw = OMAP2_MCSPI_CHCONF_DMAW; + + if (enable) + l |= rw; + else + l &= ~rw; + + mcspi_write_chconf0(spi, l); +} + +static void omap2_mcspi_set_enable(const struct spi_device *spi, int enable) +{ + struct omap2_mcspi_cs *cs = spi->controller_state; + u32 l; + + l = cs->chctrl0; + if (enable) + l |= OMAP2_MCSPI_CHCTRL_EN; + else + l &= ~OMAP2_MCSPI_CHCTRL_EN; + cs->chctrl0 = l; + mcspi_write_cs_reg(spi, OMAP2_MCSPI_CHCTRL0, cs->chctrl0); + /* Flash post-writes */ + mcspi_read_cs_reg(spi, OMAP2_MCSPI_CHCTRL0); +} + +static void omap2_mcspi_set_cs(struct spi_device *spi, bool enable) +{ + struct omap2_mcspi *mcspi = spi_master_get_devdata(spi->master); + u32 l; + + /* The controller handles the inverted chip selects + * using the OMAP2_MCSPI_CHCONF_EPOL bit so revert + * the inversion from the core spi_set_cs function. + */ + if (spi->mode & SPI_CS_HIGH) + enable = !enable; + + if (spi->controller_state) { + int err = pm_runtime_get_sync(mcspi->dev); + if (err < 0) { + pm_runtime_put_noidle(mcspi->dev); + dev_err(mcspi->dev, "failed to get sync: %d\n", err); + return; + } + + l = mcspi_cached_chconf0(spi); + + if (enable) + l &= ~OMAP2_MCSPI_CHCONF_FORCE; + else + l |= OMAP2_MCSPI_CHCONF_FORCE; + + mcspi_write_chconf0(spi, l); + + pm_runtime_mark_last_busy(mcspi->dev); + pm_runtime_put_autosuspend(mcspi->dev); + } +} + +static void omap2_mcspi_set_mode(struct spi_master *master) +{ + struct omap2_mcspi *mcspi = spi_master_get_devdata(master); + struct omap2_mcspi_regs *ctx = &mcspi->ctx; + u32 l; + + /* + * Choose master or slave mode + */ + l = mcspi_read_reg(master, OMAP2_MCSPI_MODULCTRL); + l &= ~(OMAP2_MCSPI_MODULCTRL_STEST); + if (spi_controller_is_slave(master)) { + l |= (OMAP2_MCSPI_MODULCTRL_MS); + } else { + l &= ~(OMAP2_MCSPI_MODULCTRL_MS); + l |= OMAP2_MCSPI_MODULCTRL_SINGLE; + } + mcspi_write_reg(master, OMAP2_MCSPI_MODULCTRL, l); + + ctx->modulctrl = l; +} + +static void omap2_mcspi_set_fifo(const struct spi_device *spi, + struct spi_transfer *t, int enable) +{ + struct spi_master *master = spi->master; + struct omap2_mcspi_cs *cs = spi->controller_state; + struct omap2_mcspi *mcspi; + unsigned int wcnt; + int max_fifo_depth, bytes_per_word; + u32 chconf, xferlevel; + + mcspi = spi_master_get_devdata(master); + + chconf = mcspi_cached_chconf0(spi); + if (enable) { + bytes_per_word = mcspi_bytes_per_word(cs->word_len); + if (t->len % bytes_per_word != 0) + goto disable_fifo; + + if (t->rx_buf != NULL && t->tx_buf != NULL) + max_fifo_depth = OMAP2_MCSPI_MAX_FIFODEPTH / 2; + else + max_fifo_depth = OMAP2_MCSPI_MAX_FIFODEPTH; + + wcnt = t->len / bytes_per_word; + if (wcnt > OMAP2_MCSPI_MAX_FIFOWCNT) + goto disable_fifo; + + xferlevel = wcnt << 16; + if (t->rx_buf != NULL) { + chconf |= OMAP2_MCSPI_CHCONF_FFER; + xferlevel |= (bytes_per_word - 1) << 8; + } + + if (t->tx_buf != NULL) { + chconf |= OMAP2_MCSPI_CHCONF_FFET; + xferlevel |= bytes_per_word - 1; + } + + mcspi_write_reg(master, OMAP2_MCSPI_XFERLEVEL, xferlevel); + mcspi_write_chconf0(spi, chconf); + mcspi->fifo_depth = max_fifo_depth; + + return; + } + +disable_fifo: + if (t->rx_buf != NULL) + chconf &= ~OMAP2_MCSPI_CHCONF_FFER; + + if (t->tx_buf != NULL) + chconf &= ~OMAP2_MCSPI_CHCONF_FFET; + + mcspi_write_chconf0(spi, chconf); + mcspi->fifo_depth = 0; +} + +static int mcspi_wait_for_reg_bit(void __iomem *reg, unsigned long bit) +{ + unsigned long timeout; + + timeout = jiffies + msecs_to_jiffies(1000); + while (!(readl_relaxed(reg) & bit)) { + if (time_after(jiffies, timeout)) { + if (!(readl_relaxed(reg) & bit)) + return -ETIMEDOUT; + else + return 0; + } + cpu_relax(); + } + return 0; +} + +static int mcspi_wait_for_completion(struct omap2_mcspi *mcspi, + struct completion *x) +{ + if (spi_controller_is_slave(mcspi->master)) { + if (wait_for_completion_interruptible(x) || + mcspi->slave_aborted) + return -EINTR; + } else { + wait_for_completion(x); + } + + return 0; +} + +static void omap2_mcspi_rx_callback(void *data) +{ + struct spi_device *spi = data; + struct omap2_mcspi *mcspi = spi_master_get_devdata(spi->master); + struct omap2_mcspi_dma *mcspi_dma = &mcspi->dma_channels[spi->chip_select]; + + /* We must disable the DMA RX request */ + omap2_mcspi_set_dma_req(spi, 1, 0); + + complete(&mcspi_dma->dma_rx_completion); +} + +static void omap2_mcspi_tx_callback(void *data) +{ + struct spi_device *spi = data; + struct omap2_mcspi *mcspi = spi_master_get_devdata(spi->master); + struct omap2_mcspi_dma *mcspi_dma = &mcspi->dma_channels[spi->chip_select]; + + /* We must disable the DMA TX request */ + omap2_mcspi_set_dma_req(spi, 0, 0); + + complete(&mcspi_dma->dma_tx_completion); +} + +static void omap2_mcspi_tx_dma(struct spi_device *spi, + struct spi_transfer *xfer, + struct dma_slave_config cfg) +{ + struct omap2_mcspi *mcspi; + struct omap2_mcspi_dma *mcspi_dma; + struct dma_async_tx_descriptor *tx; + + mcspi = spi_master_get_devdata(spi->master); + mcspi_dma = &mcspi->dma_channels[spi->chip_select]; + + dmaengine_slave_config(mcspi_dma->dma_tx, &cfg); + + tx = dmaengine_prep_slave_sg(mcspi_dma->dma_tx, xfer->tx_sg.sgl, + xfer->tx_sg.nents, + DMA_MEM_TO_DEV, + DMA_PREP_INTERRUPT | DMA_CTRL_ACK); + if (tx) { + tx->callback = omap2_mcspi_tx_callback; + tx->callback_param = spi; + dmaengine_submit(tx); + } else { + /* FIXME: fall back to PIO? */ + } + dma_async_issue_pending(mcspi_dma->dma_tx); + omap2_mcspi_set_dma_req(spi, 0, 1); +} + +static unsigned +omap2_mcspi_rx_dma(struct spi_device *spi, struct spi_transfer *xfer, + struct dma_slave_config cfg, + unsigned es) +{ + struct omap2_mcspi *mcspi; + struct omap2_mcspi_dma *mcspi_dma; + unsigned int count, transfer_reduction = 0; + struct scatterlist *sg_out[2]; + int nb_sizes = 0, out_mapped_nents[2], ret, x; + size_t sizes[2]; + u32 l; + int elements = 0; + int word_len, element_count; + struct omap2_mcspi_cs *cs = spi->controller_state; + void __iomem *chstat_reg = cs->base + OMAP2_MCSPI_CHSTAT0; + struct dma_async_tx_descriptor *tx; + + mcspi = spi_master_get_devdata(spi->master); + mcspi_dma = &mcspi->dma_channels[spi->chip_select]; + count = xfer->len; + + /* + * In the "End-of-Transfer Procedure" section for DMA RX in OMAP35x TRM + * it mentions reducing DMA transfer length by one element in master + * normal mode. + */ + if (mcspi->fifo_depth == 0) + transfer_reduction = es; + + word_len = cs->word_len; + l = mcspi_cached_chconf0(spi); + + if (word_len <= 8) + element_count = count; + else if (word_len <= 16) + element_count = count >> 1; + else /* word_len <= 32 */ + element_count = count >> 2; + + + dmaengine_slave_config(mcspi_dma->dma_rx, &cfg); + + /* + * Reduce DMA transfer length by one more if McSPI is + * configured in turbo mode. + */ + if ((l & OMAP2_MCSPI_CHCONF_TURBO) && mcspi->fifo_depth == 0) + transfer_reduction += es; + + if (transfer_reduction) { + /* Split sgl into two. The second sgl won't be used. */ + sizes[0] = count - transfer_reduction; + sizes[1] = transfer_reduction; + nb_sizes = 2; + } else { + /* + * Don't bother splitting the sgl. This essentially + * clones the original sgl. + */ + sizes[0] = count; + nb_sizes = 1; + } + + ret = sg_split(xfer->rx_sg.sgl, xfer->rx_sg.nents, 0, nb_sizes, + sizes, sg_out, out_mapped_nents, GFP_KERNEL); + + if (ret < 0) { + dev_err(&spi->dev, "sg_split failed\n"); + return 0; + } + + tx = dmaengine_prep_slave_sg(mcspi_dma->dma_rx, sg_out[0], + out_mapped_nents[0], DMA_DEV_TO_MEM, + DMA_PREP_INTERRUPT | DMA_CTRL_ACK); + if (tx) { + tx->callback = omap2_mcspi_rx_callback; + tx->callback_param = spi; + dmaengine_submit(tx); + } else { + /* FIXME: fall back to PIO? */ + } + + dma_async_issue_pending(mcspi_dma->dma_rx); + omap2_mcspi_set_dma_req(spi, 1, 1); + + ret = mcspi_wait_for_completion(mcspi, &mcspi_dma->dma_rx_completion); + if (ret || mcspi->slave_aborted) { + dmaengine_terminate_sync(mcspi_dma->dma_rx); + omap2_mcspi_set_dma_req(spi, 1, 0); + return 0; + } + + for (x = 0; x < nb_sizes; x++) + kfree(sg_out[x]); + + if (mcspi->fifo_depth > 0) + return count; + + /* + * Due to the DMA transfer length reduction the missing bytes must + * be read manually to receive all of the expected data. + */ + omap2_mcspi_set_enable(spi, 0); + + elements = element_count - 1; + + if (l & OMAP2_MCSPI_CHCONF_TURBO) { + elements--; + + if (!mcspi_wait_for_reg_bit(chstat_reg, + OMAP2_MCSPI_CHSTAT_RXS)) { + u32 w; + + w = mcspi_read_cs_reg(spi, OMAP2_MCSPI_RX0); + if (word_len <= 8) + ((u8 *)xfer->rx_buf)[elements++] = w; + else if (word_len <= 16) + ((u16 *)xfer->rx_buf)[elements++] = w; + else /* word_len <= 32 */ + ((u32 *)xfer->rx_buf)[elements++] = w; + } else { + int bytes_per_word = mcspi_bytes_per_word(word_len); + dev_err(&spi->dev, "DMA RX penultimate word empty\n"); + count -= (bytes_per_word << 1); + omap2_mcspi_set_enable(spi, 1); + return count; + } + } + if (!mcspi_wait_for_reg_bit(chstat_reg, OMAP2_MCSPI_CHSTAT_RXS)) { + u32 w; + + w = mcspi_read_cs_reg(spi, OMAP2_MCSPI_RX0); + if (word_len <= 8) + ((u8 *)xfer->rx_buf)[elements] = w; + else if (word_len <= 16) + ((u16 *)xfer->rx_buf)[elements] = w; + else /* word_len <= 32 */ + ((u32 *)xfer->rx_buf)[elements] = w; + } else { + dev_err(&spi->dev, "DMA RX last word empty\n"); + count -= mcspi_bytes_per_word(word_len); + } + omap2_mcspi_set_enable(spi, 1); + return count; +} + +static unsigned +omap2_mcspi_txrx_dma(struct spi_device *spi, struct spi_transfer *xfer) +{ + struct omap2_mcspi *mcspi; + struct omap2_mcspi_cs *cs = spi->controller_state; + struct omap2_mcspi_dma *mcspi_dma; + unsigned int count; + u8 *rx; + const u8 *tx; + struct dma_slave_config cfg; + enum dma_slave_buswidth width; + unsigned es; + void __iomem *chstat_reg; + void __iomem *irqstat_reg; + int wait_res; + + mcspi = spi_master_get_devdata(spi->master); + mcspi_dma = &mcspi->dma_channels[spi->chip_select]; + + if (cs->word_len <= 8) { + width = DMA_SLAVE_BUSWIDTH_1_BYTE; + es = 1; + } else if (cs->word_len <= 16) { + width = DMA_SLAVE_BUSWIDTH_2_BYTES; + es = 2; + } else { + width = DMA_SLAVE_BUSWIDTH_4_BYTES; + es = 4; + } + + count = xfer->len; + + memset(&cfg, 0, sizeof(cfg)); + cfg.src_addr = cs->phys + OMAP2_MCSPI_RX0; + cfg.dst_addr = cs->phys + OMAP2_MCSPI_TX0; + cfg.src_addr_width = width; + cfg.dst_addr_width = width; + cfg.src_maxburst = 1; + cfg.dst_maxburst = 1; + + rx = xfer->rx_buf; + tx = xfer->tx_buf; + + mcspi->slave_aborted = false; + reinit_completion(&mcspi_dma->dma_tx_completion); + reinit_completion(&mcspi_dma->dma_rx_completion); + reinit_completion(&mcspi->txdone); + if (tx) { + /* Enable EOW IRQ to know end of tx in slave mode */ + if (spi_controller_is_slave(spi->master)) + mcspi_write_reg(spi->master, + OMAP2_MCSPI_IRQENABLE, + OMAP2_MCSPI_IRQSTATUS_EOW); + omap2_mcspi_tx_dma(spi, xfer, cfg); + } + + if (rx != NULL) + count = omap2_mcspi_rx_dma(spi, xfer, cfg, es); + + if (tx != NULL) { + int ret; + + ret = mcspi_wait_for_completion(mcspi, &mcspi_dma->dma_tx_completion); + if (ret || mcspi->slave_aborted) { + dmaengine_terminate_sync(mcspi_dma->dma_tx); + omap2_mcspi_set_dma_req(spi, 0, 0); + return 0; + } + + if (spi_controller_is_slave(mcspi->master)) { + ret = mcspi_wait_for_completion(mcspi, &mcspi->txdone); + if (ret || mcspi->slave_aborted) + return 0; + } + + if (mcspi->fifo_depth > 0) { + irqstat_reg = mcspi->base + OMAP2_MCSPI_IRQSTATUS; + + if (mcspi_wait_for_reg_bit(irqstat_reg, + OMAP2_MCSPI_IRQSTATUS_EOW) < 0) + dev_err(&spi->dev, "EOW timed out\n"); + + mcspi_write_reg(mcspi->master, OMAP2_MCSPI_IRQSTATUS, + OMAP2_MCSPI_IRQSTATUS_EOW); + } + + /* for TX_ONLY mode, be sure all words have shifted out */ + if (rx == NULL) { + chstat_reg = cs->base + OMAP2_MCSPI_CHSTAT0; + if (mcspi->fifo_depth > 0) { + wait_res = mcspi_wait_for_reg_bit(chstat_reg, + OMAP2_MCSPI_CHSTAT_TXFFE); + if (wait_res < 0) + dev_err(&spi->dev, "TXFFE timed out\n"); + } else { + wait_res = mcspi_wait_for_reg_bit(chstat_reg, + OMAP2_MCSPI_CHSTAT_TXS); + if (wait_res < 0) + dev_err(&spi->dev, "TXS timed out\n"); + } + if (wait_res >= 0 && + (mcspi_wait_for_reg_bit(chstat_reg, + OMAP2_MCSPI_CHSTAT_EOT) < 0)) + dev_err(&spi->dev, "EOT timed out\n"); + } + } + return count; +} + +static unsigned +omap2_mcspi_txrx_pio(struct spi_device *spi, struct spi_transfer *xfer) +{ + struct omap2_mcspi_cs *cs = spi->controller_state; + unsigned int count, c; + u32 l; + void __iomem *base = cs->base; + void __iomem *tx_reg; + void __iomem *rx_reg; + void __iomem *chstat_reg; + int word_len; + + count = xfer->len; + c = count; + word_len = cs->word_len; + + l = mcspi_cached_chconf0(spi); + + /* We store the pre-calculated register addresses on stack to speed + * up the transfer loop. */ + tx_reg = base + OMAP2_MCSPI_TX0; + rx_reg = base + OMAP2_MCSPI_RX0; + chstat_reg = base + OMAP2_MCSPI_CHSTAT0; + + if (c < (word_len>>3)) + return 0; + + if (word_len <= 8) { + u8 *rx; + const u8 *tx; + + rx = xfer->rx_buf; + tx = xfer->tx_buf; + + do { + c -= 1; + if (tx != NULL) { + if (mcspi_wait_for_reg_bit(chstat_reg, + OMAP2_MCSPI_CHSTAT_TXS) < 0) { + dev_err(&spi->dev, "TXS timed out\n"); + goto out; + } + dev_vdbg(&spi->dev, "write-%d %02x\n", + word_len, *tx); + writel_relaxed(*tx++, tx_reg); + } + if (rx != NULL) { + if (mcspi_wait_for_reg_bit(chstat_reg, + OMAP2_MCSPI_CHSTAT_RXS) < 0) { + dev_err(&spi->dev, "RXS timed out\n"); + goto out; + } + + if (c == 1 && tx == NULL && + (l & OMAP2_MCSPI_CHCONF_TURBO)) { + omap2_mcspi_set_enable(spi, 0); + *rx++ = readl_relaxed(rx_reg); + dev_vdbg(&spi->dev, "read-%d %02x\n", + word_len, *(rx - 1)); + if (mcspi_wait_for_reg_bit(chstat_reg, + OMAP2_MCSPI_CHSTAT_RXS) < 0) { + dev_err(&spi->dev, + "RXS timed out\n"); + goto out; + } + c = 0; + } else if (c == 0 && tx == NULL) { + omap2_mcspi_set_enable(spi, 0); + } + + *rx++ = readl_relaxed(rx_reg); + dev_vdbg(&spi->dev, "read-%d %02x\n", + word_len, *(rx - 1)); + } + } while (c); + } else if (word_len <= 16) { + u16 *rx; + const u16 *tx; + + rx = xfer->rx_buf; + tx = xfer->tx_buf; + do { + c -= 2; + if (tx != NULL) { + if (mcspi_wait_for_reg_bit(chstat_reg, + OMAP2_MCSPI_CHSTAT_TXS) < 0) { + dev_err(&spi->dev, "TXS timed out\n"); + goto out; + } + dev_vdbg(&spi->dev, "write-%d %04x\n", + word_len, *tx); + writel_relaxed(*tx++, tx_reg); + } + if (rx != NULL) { + if (mcspi_wait_for_reg_bit(chstat_reg, + OMAP2_MCSPI_CHSTAT_RXS) < 0) { + dev_err(&spi->dev, "RXS timed out\n"); + goto out; + } + + if (c == 2 && tx == NULL && + (l & OMAP2_MCSPI_CHCONF_TURBO)) { + omap2_mcspi_set_enable(spi, 0); + *rx++ = readl_relaxed(rx_reg); + dev_vdbg(&spi->dev, "read-%d %04x\n", + word_len, *(rx - 1)); + if (mcspi_wait_for_reg_bit(chstat_reg, + OMAP2_MCSPI_CHSTAT_RXS) < 0) { + dev_err(&spi->dev, + "RXS timed out\n"); + goto out; + } + c = 0; + } else if (c == 0 && tx == NULL) { + omap2_mcspi_set_enable(spi, 0); + } + + *rx++ = readl_relaxed(rx_reg); + dev_vdbg(&spi->dev, "read-%d %04x\n", + word_len, *(rx - 1)); + } + } while (c >= 2); + } else if (word_len <= 32) { + u32 *rx; + const u32 *tx; + + rx = xfer->rx_buf; + tx = xfer->tx_buf; + do { + c -= 4; + if (tx != NULL) { + if (mcspi_wait_for_reg_bit(chstat_reg, + OMAP2_MCSPI_CHSTAT_TXS) < 0) { + dev_err(&spi->dev, "TXS timed out\n"); + goto out; + } + dev_vdbg(&spi->dev, "write-%d %08x\n", + word_len, *tx); + writel_relaxed(*tx++, tx_reg); + } + if (rx != NULL) { + if (mcspi_wait_for_reg_bit(chstat_reg, + OMAP2_MCSPI_CHSTAT_RXS) < 0) { + dev_err(&spi->dev, "RXS timed out\n"); + goto out; + } + + if (c == 4 && tx == NULL && + (l & OMAP2_MCSPI_CHCONF_TURBO)) { + omap2_mcspi_set_enable(spi, 0); + *rx++ = readl_relaxed(rx_reg); + dev_vdbg(&spi->dev, "read-%d %08x\n", + word_len, *(rx - 1)); + if (mcspi_wait_for_reg_bit(chstat_reg, + OMAP2_MCSPI_CHSTAT_RXS) < 0) { + dev_err(&spi->dev, + "RXS timed out\n"); + goto out; + } + c = 0; + } else if (c == 0 && tx == NULL) { + omap2_mcspi_set_enable(spi, 0); + } + + *rx++ = readl_relaxed(rx_reg); + dev_vdbg(&spi->dev, "read-%d %08x\n", + word_len, *(rx - 1)); + } + } while (c >= 4); + } + + /* for TX_ONLY mode, be sure all words have shifted out */ + if (xfer->rx_buf == NULL) { + if (mcspi_wait_for_reg_bit(chstat_reg, + OMAP2_MCSPI_CHSTAT_TXS) < 0) { + dev_err(&spi->dev, "TXS timed out\n"); + } else if (mcspi_wait_for_reg_bit(chstat_reg, + OMAP2_MCSPI_CHSTAT_EOT) < 0) + dev_err(&spi->dev, "EOT timed out\n"); + + /* disable chan to purge rx datas received in TX_ONLY transfer, + * otherwise these rx datas will affect the direct following + * RX_ONLY transfer. + */ + omap2_mcspi_set_enable(spi, 0); + } +out: + omap2_mcspi_set_enable(spi, 1); + return count - c; +} + +static u32 omap2_mcspi_calc_divisor(u32 speed_hz) +{ + u32 div; + + for (div = 0; div < 15; div++) + if (speed_hz >= (OMAP2_MCSPI_MAX_FREQ >> div)) + return div; + + return 15; +} + +/* called only when no transfer is active to this device */ +static int omap2_mcspi_setup_transfer(struct spi_device *spi, + struct spi_transfer *t) +{ + struct omap2_mcspi_cs *cs = spi->controller_state; + struct omap2_mcspi *mcspi; + u32 l = 0, clkd = 0, div, extclk = 0, clkg = 0; + u8 word_len = spi->bits_per_word; + u32 speed_hz = spi->max_speed_hz; + + mcspi = spi_master_get_devdata(spi->master); + + if (t != NULL && t->bits_per_word) + word_len = t->bits_per_word; + + cs->word_len = word_len; + + if (t && t->speed_hz) + speed_hz = t->speed_hz; + + speed_hz = min_t(u32, speed_hz, OMAP2_MCSPI_MAX_FREQ); + if (speed_hz < (OMAP2_MCSPI_MAX_FREQ / OMAP2_MCSPI_MAX_DIVIDER)) { + clkd = omap2_mcspi_calc_divisor(speed_hz); + speed_hz = OMAP2_MCSPI_MAX_FREQ >> clkd; + clkg = 0; + } else { + div = (OMAP2_MCSPI_MAX_FREQ + speed_hz - 1) / speed_hz; + speed_hz = OMAP2_MCSPI_MAX_FREQ / div; + clkd = (div - 1) & 0xf; + extclk = (div - 1) >> 4; + clkg = OMAP2_MCSPI_CHCONF_CLKG; + } + + l = mcspi_cached_chconf0(spi); + + /* standard 4-wire master mode: SCK, MOSI/out, MISO/in, nCS + * REVISIT: this controller could support SPI_3WIRE mode. + */ + if (mcspi->pin_dir == MCSPI_PINDIR_D0_IN_D1_OUT) { + l &= ~OMAP2_MCSPI_CHCONF_IS; + l &= ~OMAP2_MCSPI_CHCONF_DPE1; + l |= OMAP2_MCSPI_CHCONF_DPE0; + } else { + l |= OMAP2_MCSPI_CHCONF_IS; + l |= OMAP2_MCSPI_CHCONF_DPE1; + l &= ~OMAP2_MCSPI_CHCONF_DPE0; + } + + /* wordlength */ + l &= ~OMAP2_MCSPI_CHCONF_WL_MASK; + l |= (word_len - 1) << 7; + + /* set chipselect polarity; manage with FORCE */ + if (!(spi->mode & SPI_CS_HIGH)) + l |= OMAP2_MCSPI_CHCONF_EPOL; /* active-low; normal */ + else + l &= ~OMAP2_MCSPI_CHCONF_EPOL; + + /* set clock divisor */ + l &= ~OMAP2_MCSPI_CHCONF_CLKD_MASK; + l |= clkd << 2; + + /* set clock granularity */ + l &= ~OMAP2_MCSPI_CHCONF_CLKG; + l |= clkg; + if (clkg) { + cs->chctrl0 &= ~OMAP2_MCSPI_CHCTRL_EXTCLK_MASK; + cs->chctrl0 |= extclk << 8; + mcspi_write_cs_reg(spi, OMAP2_MCSPI_CHCTRL0, cs->chctrl0); + } + + /* set SPI mode 0..3 */ + if (spi->mode & SPI_CPOL) + l |= OMAP2_MCSPI_CHCONF_POL; + else + l &= ~OMAP2_MCSPI_CHCONF_POL; + if (spi->mode & SPI_CPHA) + l |= OMAP2_MCSPI_CHCONF_PHA; + else + l &= ~OMAP2_MCSPI_CHCONF_PHA; + + mcspi_write_chconf0(spi, l); + + cs->mode = spi->mode; + + dev_dbg(&spi->dev, "setup: speed %d, sample %s edge, clk %s\n", + speed_hz, + (spi->mode & SPI_CPHA) ? "trailing" : "leading", + (spi->mode & SPI_CPOL) ? "inverted" : "normal"); + + return 0; +} + +/* + * Note that we currently allow DMA only if we get a channel + * for both rx and tx. Otherwise we'll do PIO for both rx and tx. + */ +static int omap2_mcspi_request_dma(struct omap2_mcspi *mcspi, + struct omap2_mcspi_dma *mcspi_dma) +{ + int ret = 0; + + mcspi_dma->dma_rx = dma_request_chan(mcspi->dev, + mcspi_dma->dma_rx_ch_name); + if (IS_ERR(mcspi_dma->dma_rx)) { + ret = PTR_ERR(mcspi_dma->dma_rx); + mcspi_dma->dma_rx = NULL; + goto no_dma; + } + + mcspi_dma->dma_tx = dma_request_chan(mcspi->dev, + mcspi_dma->dma_tx_ch_name); + if (IS_ERR(mcspi_dma->dma_tx)) { + ret = PTR_ERR(mcspi_dma->dma_tx); + mcspi_dma->dma_tx = NULL; + dma_release_channel(mcspi_dma->dma_rx); + mcspi_dma->dma_rx = NULL; + } + + init_completion(&mcspi_dma->dma_rx_completion); + init_completion(&mcspi_dma->dma_tx_completion); + +no_dma: + return ret; +} + +static void omap2_mcspi_release_dma(struct spi_master *master) +{ + struct omap2_mcspi *mcspi = spi_master_get_devdata(master); + struct omap2_mcspi_dma *mcspi_dma; + int i; + + for (i = 0; i < master->num_chipselect; i++) { + mcspi_dma = &mcspi->dma_channels[i]; + + if (mcspi_dma->dma_rx) { + dma_release_channel(mcspi_dma->dma_rx); + mcspi_dma->dma_rx = NULL; + } + if (mcspi_dma->dma_tx) { + dma_release_channel(mcspi_dma->dma_tx); + mcspi_dma->dma_tx = NULL; + } + } +} + +static void omap2_mcspi_cleanup(struct spi_device *spi) +{ + struct omap2_mcspi_cs *cs; + + if (spi->controller_state) { + /* Unlink controller state from context save list */ + cs = spi->controller_state; + list_del(&cs->node); + + kfree(cs); + } +} + +static int omap2_mcspi_setup(struct spi_device *spi) +{ + bool initial_setup = false; + int ret; + struct omap2_mcspi *mcspi = spi_master_get_devdata(spi->master); + struct omap2_mcspi_regs *ctx = &mcspi->ctx; + struct omap2_mcspi_cs *cs = spi->controller_state; + + if (!cs) { + cs = kzalloc(sizeof *cs, GFP_KERNEL); + if (!cs) + return -ENOMEM; + cs->base = mcspi->base + spi->chip_select * 0x14; + cs->phys = mcspi->phys + spi->chip_select * 0x14; + cs->mode = 0; + cs->chconf0 = 0; + cs->chctrl0 = 0; + spi->controller_state = cs; + /* Link this to context save list */ + list_add_tail(&cs->node, &ctx->cs); + initial_setup = true; + } + + ret = pm_runtime_get_sync(mcspi->dev); + if (ret < 0) { + pm_runtime_put_noidle(mcspi->dev); + if (initial_setup) + omap2_mcspi_cleanup(spi); + + return ret; + } + + ret = omap2_mcspi_setup_transfer(spi, NULL); + if (ret && initial_setup) + omap2_mcspi_cleanup(spi); + + pm_runtime_mark_last_busy(mcspi->dev); + pm_runtime_put_autosuspend(mcspi->dev); + + return ret; +} + +static irqreturn_t omap2_mcspi_irq_handler(int irq, void *data) +{ + struct omap2_mcspi *mcspi = data; + u32 irqstat; + + irqstat = mcspi_read_reg(mcspi->master, OMAP2_MCSPI_IRQSTATUS); + if (!irqstat) + return IRQ_NONE; + + /* Disable IRQ and wakeup slave xfer task */ + mcspi_write_reg(mcspi->master, OMAP2_MCSPI_IRQENABLE, 0); + if (irqstat & OMAP2_MCSPI_IRQSTATUS_EOW) + complete(&mcspi->txdone); + + return IRQ_HANDLED; +} + +static int omap2_mcspi_slave_abort(struct spi_master *master) +{ + struct omap2_mcspi *mcspi = spi_master_get_devdata(master); + struct omap2_mcspi_dma *mcspi_dma = mcspi->dma_channels; + + mcspi->slave_aborted = true; + complete(&mcspi_dma->dma_rx_completion); + complete(&mcspi_dma->dma_tx_completion); + complete(&mcspi->txdone); + + return 0; +} + +static int omap2_mcspi_transfer_one(struct spi_master *master, + struct spi_device *spi, + struct spi_transfer *t) +{ + + /* We only enable one channel at a time -- the one whose message is + * -- although this controller would gladly + * arbitrate among multiple channels. This corresponds to "single + * channel" master mode. As a side effect, we need to manage the + * chipselect with the FORCE bit ... CS != channel enable. + */ + + struct omap2_mcspi *mcspi; + struct omap2_mcspi_dma *mcspi_dma; + struct omap2_mcspi_cs *cs; + struct omap2_mcspi_device_config *cd; + int par_override = 0; + int status = 0; + u32 chconf; + + mcspi = spi_master_get_devdata(master); + mcspi_dma = mcspi->dma_channels + spi->chip_select; + cs = spi->controller_state; + cd = spi->controller_data; + + /* + * The slave driver could have changed spi->mode in which case + * it will be different from cs->mode (the current hardware setup). + * If so, set par_override (even though its not a parity issue) so + * omap2_mcspi_setup_transfer will be called to configure the hardware + * with the correct mode on the first iteration of the loop below. + */ + if (spi->mode != cs->mode) + par_override = 1; + + omap2_mcspi_set_enable(spi, 0); + + if (spi->cs_gpiod) + omap2_mcspi_set_cs(spi, spi->mode & SPI_CS_HIGH); + + if (par_override || + (t->speed_hz != spi->max_speed_hz) || + (t->bits_per_word != spi->bits_per_word)) { + par_override = 1; + status = omap2_mcspi_setup_transfer(spi, t); + if (status < 0) + goto out; + if (t->speed_hz == spi->max_speed_hz && + t->bits_per_word == spi->bits_per_word) + par_override = 0; + } + if (cd && cd->cs_per_word) { + chconf = mcspi->ctx.modulctrl; + chconf &= ~OMAP2_MCSPI_MODULCTRL_SINGLE; + mcspi_write_reg(master, OMAP2_MCSPI_MODULCTRL, chconf); + mcspi->ctx.modulctrl = + mcspi_read_cs_reg(spi, OMAP2_MCSPI_MODULCTRL); + } + + chconf = mcspi_cached_chconf0(spi); + chconf &= ~OMAP2_MCSPI_CHCONF_TRM_MASK; + chconf &= ~OMAP2_MCSPI_CHCONF_TURBO; + + if (t->tx_buf == NULL) + chconf |= OMAP2_MCSPI_CHCONF_TRM_RX_ONLY; + else if (t->rx_buf == NULL) + chconf |= OMAP2_MCSPI_CHCONF_TRM_TX_ONLY; + + if (cd && cd->turbo_mode && t->tx_buf == NULL) { + /* Turbo mode is for more than one word */ + if (t->len > ((cs->word_len + 7) >> 3)) + chconf |= OMAP2_MCSPI_CHCONF_TURBO; + } + + mcspi_write_chconf0(spi, chconf); + + if (t->len) { + unsigned count; + + if ((mcspi_dma->dma_rx && mcspi_dma->dma_tx) && + master->cur_msg_mapped && + master->can_dma(master, spi, t)) + omap2_mcspi_set_fifo(spi, t, 1); + + omap2_mcspi_set_enable(spi, 1); + + /* RX_ONLY mode needs dummy data in TX reg */ + if (t->tx_buf == NULL) + writel_relaxed(0, cs->base + + OMAP2_MCSPI_TX0); + + if ((mcspi_dma->dma_rx && mcspi_dma->dma_tx) && + master->cur_msg_mapped && + master->can_dma(master, spi, t)) + count = omap2_mcspi_txrx_dma(spi, t); + else + count = omap2_mcspi_txrx_pio(spi, t); + + if (count != t->len) { + status = -EIO; + goto out; + } + } + + omap2_mcspi_set_enable(spi, 0); + + if (mcspi->fifo_depth > 0) + omap2_mcspi_set_fifo(spi, t, 0); + +out: + /* Restore defaults if they were overriden */ + if (par_override) { + par_override = 0; + status = omap2_mcspi_setup_transfer(spi, NULL); + } + + if (cd && cd->cs_per_word) { + chconf = mcspi->ctx.modulctrl; + chconf |= OMAP2_MCSPI_MODULCTRL_SINGLE; + mcspi_write_reg(master, OMAP2_MCSPI_MODULCTRL, chconf); + mcspi->ctx.modulctrl = + mcspi_read_cs_reg(spi, OMAP2_MCSPI_MODULCTRL); + } + + omap2_mcspi_set_enable(spi, 0); + + if (spi->cs_gpiod) + omap2_mcspi_set_cs(spi, !(spi->mode & SPI_CS_HIGH)); + + if (mcspi->fifo_depth > 0 && t) + omap2_mcspi_set_fifo(spi, t, 0); + + return status; +} + +static int omap2_mcspi_prepare_message(struct spi_master *master, + struct spi_message *msg) +{ + struct omap2_mcspi *mcspi = spi_master_get_devdata(master); + struct omap2_mcspi_regs *ctx = &mcspi->ctx; + struct omap2_mcspi_cs *cs; + + /* Only a single channel can have the FORCE bit enabled + * in its chconf0 register. + * Scan all channels and disable them except the current one. + * A FORCE can remain from a last transfer having cs_change enabled + */ + list_for_each_entry(cs, &ctx->cs, node) { + if (msg->spi->controller_state == cs) + continue; + + if ((cs->chconf0 & OMAP2_MCSPI_CHCONF_FORCE)) { + cs->chconf0 &= ~OMAP2_MCSPI_CHCONF_FORCE; + writel_relaxed(cs->chconf0, + cs->base + OMAP2_MCSPI_CHCONF0); + readl_relaxed(cs->base + OMAP2_MCSPI_CHCONF0); + } + } + + return 0; +} + +static bool omap2_mcspi_can_dma(struct spi_master *master, + struct spi_device *spi, + struct spi_transfer *xfer) +{ + struct omap2_mcspi *mcspi = spi_master_get_devdata(spi->master); + struct omap2_mcspi_dma *mcspi_dma = + &mcspi->dma_channels[spi->chip_select]; + + if (!mcspi_dma->dma_rx || !mcspi_dma->dma_tx) + return false; + + if (spi_controller_is_slave(master)) + return true; + + master->dma_rx = mcspi_dma->dma_rx; + master->dma_tx = mcspi_dma->dma_tx; + + return (xfer->len >= DMA_MIN_BYTES); +} + +static size_t omap2_mcspi_max_xfer_size(struct spi_device *spi) +{ + struct omap2_mcspi *mcspi = spi_master_get_devdata(spi->master); + struct omap2_mcspi_dma *mcspi_dma = + &mcspi->dma_channels[spi->chip_select]; + + if (mcspi->max_xfer_len && mcspi_dma->dma_rx) + return mcspi->max_xfer_len; + + return SIZE_MAX; +} + +static int omap2_mcspi_controller_setup(struct omap2_mcspi *mcspi) +{ + struct spi_master *master = mcspi->master; + struct omap2_mcspi_regs *ctx = &mcspi->ctx; + int ret = 0; + + ret = pm_runtime_get_sync(mcspi->dev); + if (ret < 0) { + pm_runtime_put_noidle(mcspi->dev); + + return ret; + } + + mcspi_write_reg(master, OMAP2_MCSPI_WAKEUPENABLE, + OMAP2_MCSPI_WAKEUPENABLE_WKEN); + ctx->wakeupenable = OMAP2_MCSPI_WAKEUPENABLE_WKEN; + + omap2_mcspi_set_mode(master); + pm_runtime_mark_last_busy(mcspi->dev); + pm_runtime_put_autosuspend(mcspi->dev); + return 0; +} + +/* + * When SPI wake up from off-mode, CS is in activate state. If it was in + * inactive state when driver was suspend, then force it to inactive state at + * wake up. + */ +static int omap_mcspi_runtime_resume(struct device *dev) +{ + struct spi_master *master = dev_get_drvdata(dev); + struct omap2_mcspi *mcspi = spi_master_get_devdata(master); + struct omap2_mcspi_regs *ctx = &mcspi->ctx; + struct omap2_mcspi_cs *cs; + + /* McSPI: context restore */ + mcspi_write_reg(master, OMAP2_MCSPI_MODULCTRL, ctx->modulctrl); + mcspi_write_reg(master, OMAP2_MCSPI_WAKEUPENABLE, ctx->wakeupenable); + + list_for_each_entry(cs, &ctx->cs, node) { + /* + * We need to toggle CS state for OMAP take this + * change in account. + */ + if ((cs->chconf0 & OMAP2_MCSPI_CHCONF_FORCE) == 0) { + cs->chconf0 |= OMAP2_MCSPI_CHCONF_FORCE; + writel_relaxed(cs->chconf0, + cs->base + OMAP2_MCSPI_CHCONF0); + cs->chconf0 &= ~OMAP2_MCSPI_CHCONF_FORCE; + writel_relaxed(cs->chconf0, + cs->base + OMAP2_MCSPI_CHCONF0); + } else { + writel_relaxed(cs->chconf0, + cs->base + OMAP2_MCSPI_CHCONF0); + } + } + + return 0; +} + +static struct omap2_mcspi_platform_config omap2_pdata = { + .regs_offset = 0, +}; + +static struct omap2_mcspi_platform_config omap4_pdata = { + .regs_offset = OMAP4_MCSPI_REG_OFFSET, +}; + +static struct omap2_mcspi_platform_config am654_pdata = { + .regs_offset = OMAP4_MCSPI_REG_OFFSET, + .max_xfer_len = SZ_4K - 1, +}; + +static const struct of_device_id omap_mcspi_of_match[] = { + { + .compatible = "ti,omap2-mcspi", + .data = &omap2_pdata, + }, + { + .compatible = "ti,omap4-mcspi", + .data = &omap4_pdata, + }, + { + .compatible = "ti,am654-mcspi", + .data = &am654_pdata, + }, + { }, +}; +MODULE_DEVICE_TABLE(of, omap_mcspi_of_match); + +static int omap2_mcspi_probe(struct platform_device *pdev) +{ + struct spi_master *master; + const struct omap2_mcspi_platform_config *pdata; + struct omap2_mcspi *mcspi; + struct resource *r; + int status = 0, i; + u32 regs_offset = 0; + struct device_node *node = pdev->dev.of_node; + const struct of_device_id *match; + + if (of_property_read_bool(node, "spi-slave")) + master = spi_alloc_slave(&pdev->dev, sizeof(*mcspi)); + else + master = spi_alloc_master(&pdev->dev, sizeof(*mcspi)); + if (!master) + return -ENOMEM; + + /* the spi->mode bits understood by this driver: */ + master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH; + master->bits_per_word_mask = SPI_BPW_RANGE_MASK(4, 32); + master->setup = omap2_mcspi_setup; + master->auto_runtime_pm = true; + master->prepare_message = omap2_mcspi_prepare_message; + master->can_dma = omap2_mcspi_can_dma; + master->transfer_one = omap2_mcspi_transfer_one; + master->set_cs = omap2_mcspi_set_cs; + master->cleanup = omap2_mcspi_cleanup; + master->slave_abort = omap2_mcspi_slave_abort; + master->dev.of_node = node; + master->max_speed_hz = OMAP2_MCSPI_MAX_FREQ; + master->min_speed_hz = OMAP2_MCSPI_MAX_FREQ >> 15; + master->use_gpio_descriptors = true; + + platform_set_drvdata(pdev, master); + + mcspi = spi_master_get_devdata(master); + mcspi->master = master; + + match = of_match_device(omap_mcspi_of_match, &pdev->dev); + if (match) { + u32 num_cs = 1; /* default number of chipselect */ + pdata = match->data; + + of_property_read_u32(node, "ti,spi-num-cs", &num_cs); + master->num_chipselect = num_cs; + if (of_get_property(node, "ti,pindir-d0-out-d1-in", NULL)) + mcspi->pin_dir = MCSPI_PINDIR_D0_OUT_D1_IN; + } else { + pdata = dev_get_platdata(&pdev->dev); + master->num_chipselect = pdata->num_cs; + mcspi->pin_dir = pdata->pin_dir; + } + regs_offset = pdata->regs_offset; + if (pdata->max_xfer_len) { + mcspi->max_xfer_len = pdata->max_xfer_len; + master->max_transfer_size = omap2_mcspi_max_xfer_size; + } + + r = platform_get_resource(pdev, IORESOURCE_MEM, 0); + mcspi->base = devm_ioremap_resource(&pdev->dev, r); + if (IS_ERR(mcspi->base)) { + status = PTR_ERR(mcspi->base); + goto free_master; + } + mcspi->phys = r->start + regs_offset; + mcspi->base += regs_offset; + + mcspi->dev = &pdev->dev; + + INIT_LIST_HEAD(&mcspi->ctx.cs); + + mcspi->dma_channels = devm_kcalloc(&pdev->dev, master->num_chipselect, + sizeof(struct omap2_mcspi_dma), + GFP_KERNEL); + if (mcspi->dma_channels == NULL) { + status = -ENOMEM; + goto free_master; + } + + for (i = 0; i < master->num_chipselect; i++) { + sprintf(mcspi->dma_channels[i].dma_rx_ch_name, "rx%d", i); + sprintf(mcspi->dma_channels[i].dma_tx_ch_name, "tx%d", i); + + status = omap2_mcspi_request_dma(mcspi, + &mcspi->dma_channels[i]); + if (status == -EPROBE_DEFER) + goto free_master; + } + + status = platform_get_irq(pdev, 0); + if (status == -EPROBE_DEFER) + goto free_master; + if (status < 0) { + dev_err(&pdev->dev, "no irq resource found\n"); + goto free_master; + } + init_completion(&mcspi->txdone); + status = devm_request_irq(&pdev->dev, status, + omap2_mcspi_irq_handler, 0, pdev->name, + mcspi); + if (status) { + dev_err(&pdev->dev, "Cannot request IRQ"); + goto free_master; + } + + pm_runtime_use_autosuspend(&pdev->dev); + pm_runtime_set_autosuspend_delay(&pdev->dev, SPI_AUTOSUSPEND_TIMEOUT); + pm_runtime_enable(&pdev->dev); + + status = omap2_mcspi_controller_setup(mcspi); + if (status < 0) + goto disable_pm; + + status = devm_spi_register_controller(&pdev->dev, master); + if (status < 0) + goto disable_pm; + + return status; + +disable_pm: + pm_runtime_dont_use_autosuspend(&pdev->dev); + pm_runtime_put_sync(&pdev->dev); + pm_runtime_disable(&pdev->dev); +free_master: + omap2_mcspi_release_dma(master); + spi_master_put(master); + return status; +} + +static int omap2_mcspi_remove(struct platform_device *pdev) +{ + struct spi_master *master = platform_get_drvdata(pdev); + struct omap2_mcspi *mcspi = spi_master_get_devdata(master); + + omap2_mcspi_release_dma(master); + + pm_runtime_dont_use_autosuspend(mcspi->dev); + pm_runtime_put_sync(mcspi->dev); + pm_runtime_disable(&pdev->dev); + + return 0; +} + +/* work with hotplug and coldplug */ +MODULE_ALIAS("platform:omap2_mcspi"); + +static int __maybe_unused omap2_mcspi_suspend(struct device *dev) +{ + struct spi_master *master = dev_get_drvdata(dev); + struct omap2_mcspi *mcspi = spi_master_get_devdata(master); + int error; + + error = pinctrl_pm_select_sleep_state(dev); + if (error) + dev_warn(mcspi->dev, "%s: failed to set pins: %i\n", + __func__, error); + + error = spi_master_suspend(master); + if (error) + dev_warn(mcspi->dev, "%s: master suspend failed: %i\n", + __func__, error); + + return pm_runtime_force_suspend(dev); +} + +static int __maybe_unused omap2_mcspi_resume(struct device *dev) +{ + struct spi_master *master = dev_get_drvdata(dev); + struct omap2_mcspi *mcspi = spi_master_get_devdata(master); + int error; + + error = pinctrl_pm_select_default_state(dev); + if (error) + dev_warn(mcspi->dev, "%s: failed to set pins: %i\n", + __func__, error); + + error = spi_master_resume(master); + if (error) + dev_warn(mcspi->dev, "%s: master resume failed: %i\n", + __func__, error); + + return pm_runtime_force_resume(dev); +} + +static const struct dev_pm_ops omap2_mcspi_pm_ops = { + SET_SYSTEM_SLEEP_PM_OPS(omap2_mcspi_suspend, + omap2_mcspi_resume) + .runtime_resume = omap_mcspi_runtime_resume, +}; + +static struct platform_driver omap2_mcspi_driver = { + .driver = { + .name = "omap2_mcspi", + .pm = &omap2_mcspi_pm_ops, + .of_match_table = omap_mcspi_of_match, + }, + .probe = omap2_mcspi_probe, + .remove = omap2_mcspi_remove, +}; + +module_platform_driver(omap2_mcspi_driver); +MODULE_LICENSE("GPL"); diff --git a/drivers/spi/spi-orion.c b/drivers/spi/spi-orion.c new file mode 100644 index 000000000..b57b8b3cc --- /dev/null +++ b/drivers/spi/spi-orion.c @@ -0,0 +1,812 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Marvell Orion SPI controller driver + * + * Author: Shadi Ammouri <shadi@marvell.com> + * Copyright (C) 2007-2008 Marvell Ltd. + */ + +#include <linux/interrupt.h> +#include <linux/delay.h> +#include <linux/platform_device.h> +#include <linux/err.h> +#include <linux/io.h> +#include <linux/spi/spi.h> +#include <linux/module.h> +#include <linux/pm_runtime.h> +#include <linux/of.h> +#include <linux/of_address.h> +#include <linux/of_device.h> +#include <linux/clk.h> +#include <linux/sizes.h> +#include <asm/unaligned.h> + +#define DRIVER_NAME "orion_spi" + +/* Runtime PM autosuspend timeout: PM is fairly light on this driver */ +#define SPI_AUTOSUSPEND_TIMEOUT 200 + +/* Some SoCs using this driver support up to 8 chip selects. + * It is up to the implementer to only use the chip selects + * that are available. + */ +#define ORION_NUM_CHIPSELECTS 8 + +#define ORION_SPI_WAIT_RDY_MAX_LOOP 2000 /* in usec */ + +#define ORION_SPI_IF_CTRL_REG 0x00 +#define ORION_SPI_IF_CONFIG_REG 0x04 +#define ORION_SPI_IF_RXLSBF BIT(14) +#define ORION_SPI_IF_TXLSBF BIT(13) +#define ORION_SPI_DATA_OUT_REG 0x08 +#define ORION_SPI_DATA_IN_REG 0x0c +#define ORION_SPI_INT_CAUSE_REG 0x10 +#define ORION_SPI_TIMING_PARAMS_REG 0x18 + +/* Register for the "Direct Mode" */ +#define SPI_DIRECT_WRITE_CONFIG_REG 0x20 + +#define ORION_SPI_TMISO_SAMPLE_MASK (0x3 << 6) +#define ORION_SPI_TMISO_SAMPLE_1 (1 << 6) +#define ORION_SPI_TMISO_SAMPLE_2 (2 << 6) + +#define ORION_SPI_MODE_CPOL (1 << 11) +#define ORION_SPI_MODE_CPHA (1 << 12) +#define ORION_SPI_IF_8_16_BIT_MODE (1 << 5) +#define ORION_SPI_CLK_PRESCALE_MASK 0x1F +#define ARMADA_SPI_CLK_PRESCALE_MASK 0xDF +#define ORION_SPI_MODE_MASK (ORION_SPI_MODE_CPOL | \ + ORION_SPI_MODE_CPHA) +#define ORION_SPI_CS_MASK 0x1C +#define ORION_SPI_CS_SHIFT 2 +#define ORION_SPI_CS(cs) ((cs << ORION_SPI_CS_SHIFT) & \ + ORION_SPI_CS_MASK) + +enum orion_spi_type { + ORION_SPI, + ARMADA_SPI, +}; + +struct orion_spi_dev { + enum orion_spi_type typ; + /* + * min_divisor and max_hz should be exclusive, the only we can + * have both is for managing the armada-370-spi case with old + * device tree + */ + unsigned long max_hz; + unsigned int min_divisor; + unsigned int max_divisor; + u32 prescale_mask; + bool is_errata_50mhz_ac; +}; + +struct orion_direct_acc { + void __iomem *vaddr; + u32 size; +}; + +struct orion_child_options { + struct orion_direct_acc direct_access; +}; + +struct orion_spi { + struct spi_master *master; + void __iomem *base; + struct clk *clk; + struct clk *axi_clk; + const struct orion_spi_dev *devdata; + + struct orion_child_options child[ORION_NUM_CHIPSELECTS]; +}; + +static inline void __iomem *spi_reg(struct orion_spi *orion_spi, u32 reg) +{ + return orion_spi->base + reg; +} + +static inline void +orion_spi_setbits(struct orion_spi *orion_spi, u32 reg, u32 mask) +{ + void __iomem *reg_addr = spi_reg(orion_spi, reg); + u32 val; + + val = readl(reg_addr); + val |= mask; + writel(val, reg_addr); +} + +static inline void +orion_spi_clrbits(struct orion_spi *orion_spi, u32 reg, u32 mask) +{ + void __iomem *reg_addr = spi_reg(orion_spi, reg); + u32 val; + + val = readl(reg_addr); + val &= ~mask; + writel(val, reg_addr); +} + +static int orion_spi_baudrate_set(struct spi_device *spi, unsigned int speed) +{ + u32 tclk_hz; + u32 rate; + u32 prescale; + u32 reg; + struct orion_spi *orion_spi; + const struct orion_spi_dev *devdata; + + orion_spi = spi_master_get_devdata(spi->master); + devdata = orion_spi->devdata; + + tclk_hz = clk_get_rate(orion_spi->clk); + + if (devdata->typ == ARMADA_SPI) { + /* + * Given the core_clk (tclk_hz) and the target rate (speed) we + * determine the best values for SPR (in [0 .. 15]) and SPPR (in + * [0..7]) such that + * + * core_clk / (SPR * 2 ** SPPR) + * + * is as big as possible but not bigger than speed. + */ + + /* best integer divider: */ + unsigned divider = DIV_ROUND_UP(tclk_hz, speed); + unsigned spr, sppr; + + if (divider < 16) { + /* This is the easy case, divider is less than 16 */ + spr = divider; + sppr = 0; + + } else { + unsigned two_pow_sppr; + /* + * Find the highest bit set in divider. This and the + * three next bits define SPR (apart from rounding). + * SPPR is then the number of zero bits that must be + * appended: + */ + sppr = fls(divider) - 4; + + /* + * As SPR only has 4 bits, we have to round divider up + * to the next multiple of 2 ** sppr. + */ + two_pow_sppr = 1 << sppr; + divider = (divider + two_pow_sppr - 1) & -two_pow_sppr; + + /* + * recalculate sppr as rounding up divider might have + * increased it enough to change the position of the + * highest set bit. In this case the bit that now + * doesn't make it into SPR is 0, so there is no need to + * round again. + */ + sppr = fls(divider) - 4; + spr = divider >> sppr; + + /* + * Now do range checking. SPR is constructed to have a + * width of 4 bits, so this is fine for sure. So we + * still need to check for sppr to fit into 3 bits: + */ + if (sppr > 7) + return -EINVAL; + } + + prescale = ((sppr & 0x6) << 5) | ((sppr & 0x1) << 4) | spr; + } else { + /* + * the supported rates are: 4,6,8...30 + * round up as we look for equal or less speed + */ + rate = DIV_ROUND_UP(tclk_hz, speed); + rate = roundup(rate, 2); + + /* check if requested speed is too small */ + if (rate > 30) + return -EINVAL; + + if (rate < 4) + rate = 4; + + /* Convert the rate to SPI clock divisor value. */ + prescale = 0x10 + rate/2; + } + + reg = readl(spi_reg(orion_spi, ORION_SPI_IF_CONFIG_REG)); + reg = ((reg & ~devdata->prescale_mask) | prescale); + writel(reg, spi_reg(orion_spi, ORION_SPI_IF_CONFIG_REG)); + + return 0; +} + +static void +orion_spi_mode_set(struct spi_device *spi) +{ + u32 reg; + struct orion_spi *orion_spi; + + orion_spi = spi_master_get_devdata(spi->master); + + reg = readl(spi_reg(orion_spi, ORION_SPI_IF_CONFIG_REG)); + reg &= ~ORION_SPI_MODE_MASK; + if (spi->mode & SPI_CPOL) + reg |= ORION_SPI_MODE_CPOL; + if (spi->mode & SPI_CPHA) + reg |= ORION_SPI_MODE_CPHA; + if (spi->mode & SPI_LSB_FIRST) + reg |= ORION_SPI_IF_RXLSBF | ORION_SPI_IF_TXLSBF; + else + reg &= ~(ORION_SPI_IF_RXLSBF | ORION_SPI_IF_TXLSBF); + + writel(reg, spi_reg(orion_spi, ORION_SPI_IF_CONFIG_REG)); +} + +static void +orion_spi_50mhz_ac_timing_erratum(struct spi_device *spi, unsigned int speed) +{ + u32 reg; + struct orion_spi *orion_spi; + + orion_spi = spi_master_get_devdata(spi->master); + + /* + * Erratum description: (Erratum NO. FE-9144572) The device + * SPI interface supports frequencies of up to 50 MHz. + * However, due to this erratum, when the device core clock is + * 250 MHz and the SPI interfaces is configured for 50MHz SPI + * clock and CPOL=CPHA=1 there might occur data corruption on + * reads from the SPI device. + * Erratum Workaround: + * Work in one of the following configurations: + * 1. Set CPOL=CPHA=0 in "SPI Interface Configuration + * Register". + * 2. Set TMISO_SAMPLE value to 0x2 in "SPI Timing Parameters 1 + * Register" before setting the interface. + */ + reg = readl(spi_reg(orion_spi, ORION_SPI_TIMING_PARAMS_REG)); + reg &= ~ORION_SPI_TMISO_SAMPLE_MASK; + + if (clk_get_rate(orion_spi->clk) == 250000000 && + speed == 50000000 && spi->mode & SPI_CPOL && + spi->mode & SPI_CPHA) + reg |= ORION_SPI_TMISO_SAMPLE_2; + else + reg |= ORION_SPI_TMISO_SAMPLE_1; /* This is the default value */ + + writel(reg, spi_reg(orion_spi, ORION_SPI_TIMING_PARAMS_REG)); +} + +/* + * called only when no transfer is active on the bus + */ +static int +orion_spi_setup_transfer(struct spi_device *spi, struct spi_transfer *t) +{ + struct orion_spi *orion_spi; + unsigned int speed = spi->max_speed_hz; + unsigned int bits_per_word = spi->bits_per_word; + int rc; + + orion_spi = spi_master_get_devdata(spi->master); + + if ((t != NULL) && t->speed_hz) + speed = t->speed_hz; + + if ((t != NULL) && t->bits_per_word) + bits_per_word = t->bits_per_word; + + orion_spi_mode_set(spi); + + if (orion_spi->devdata->is_errata_50mhz_ac) + orion_spi_50mhz_ac_timing_erratum(spi, speed); + + rc = orion_spi_baudrate_set(spi, speed); + if (rc) + return rc; + + if (bits_per_word == 16) + orion_spi_setbits(orion_spi, ORION_SPI_IF_CONFIG_REG, + ORION_SPI_IF_8_16_BIT_MODE); + else + orion_spi_clrbits(orion_spi, ORION_SPI_IF_CONFIG_REG, + ORION_SPI_IF_8_16_BIT_MODE); + + return 0; +} + +static void orion_spi_set_cs(struct spi_device *spi, bool enable) +{ + struct orion_spi *orion_spi; + + orion_spi = spi_master_get_devdata(spi->master); + + /* + * If this line is using a GPIO to control chip select, this internal + * .set_cs() function will still be called, so we clear any previous + * chip select. The CS we activate will not have any elecrical effect, + * as it is handled by a GPIO, but that doesn't matter. What we need + * is to deassert the old chip select and assert some other chip select. + */ + orion_spi_clrbits(orion_spi, ORION_SPI_IF_CTRL_REG, ORION_SPI_CS_MASK); + orion_spi_setbits(orion_spi, ORION_SPI_IF_CTRL_REG, + ORION_SPI_CS(spi->chip_select)); + + /* + * Chip select logic is inverted from spi_set_cs(). For lines using a + * GPIO to do chip select SPI_CS_HIGH is enforced and inversion happens + * in the GPIO library, but we don't care about that, because in those + * cases we are dealing with an unused native CS anyways so the polarity + * doesn't matter. + */ + if (!enable) + orion_spi_setbits(orion_spi, ORION_SPI_IF_CTRL_REG, 0x1); + else + orion_spi_clrbits(orion_spi, ORION_SPI_IF_CTRL_REG, 0x1); +} + +static inline int orion_spi_wait_till_ready(struct orion_spi *orion_spi) +{ + int i; + + for (i = 0; i < ORION_SPI_WAIT_RDY_MAX_LOOP; i++) { + if (readl(spi_reg(orion_spi, ORION_SPI_INT_CAUSE_REG))) + return 1; + + udelay(1); + } + + return -1; +} + +static inline int +orion_spi_write_read_8bit(struct spi_device *spi, + const u8 **tx_buf, u8 **rx_buf) +{ + void __iomem *tx_reg, *rx_reg, *int_reg; + struct orion_spi *orion_spi; + + orion_spi = spi_master_get_devdata(spi->master); + tx_reg = spi_reg(orion_spi, ORION_SPI_DATA_OUT_REG); + rx_reg = spi_reg(orion_spi, ORION_SPI_DATA_IN_REG); + int_reg = spi_reg(orion_spi, ORION_SPI_INT_CAUSE_REG); + + /* clear the interrupt cause register */ + writel(0x0, int_reg); + + if (tx_buf && *tx_buf) + writel(*(*tx_buf)++, tx_reg); + else + writel(0, tx_reg); + + if (orion_spi_wait_till_ready(orion_spi) < 0) { + dev_err(&spi->dev, "TXS timed out\n"); + return -1; + } + + if (rx_buf && *rx_buf) + *(*rx_buf)++ = readl(rx_reg); + + return 1; +} + +static inline int +orion_spi_write_read_16bit(struct spi_device *spi, + const u16 **tx_buf, u16 **rx_buf) +{ + void __iomem *tx_reg, *rx_reg, *int_reg; + struct orion_spi *orion_spi; + + orion_spi = spi_master_get_devdata(spi->master); + tx_reg = spi_reg(orion_spi, ORION_SPI_DATA_OUT_REG); + rx_reg = spi_reg(orion_spi, ORION_SPI_DATA_IN_REG); + int_reg = spi_reg(orion_spi, ORION_SPI_INT_CAUSE_REG); + + /* clear the interrupt cause register */ + writel(0x0, int_reg); + + if (tx_buf && *tx_buf) + writel(__cpu_to_le16(get_unaligned((*tx_buf)++)), tx_reg); + else + writel(0, tx_reg); + + if (orion_spi_wait_till_ready(orion_spi) < 0) { + dev_err(&spi->dev, "TXS timed out\n"); + return -1; + } + + if (rx_buf && *rx_buf) + put_unaligned(__le16_to_cpu(readl(rx_reg)), (*rx_buf)++); + + return 1; +} + +static unsigned int +orion_spi_write_read(struct spi_device *spi, struct spi_transfer *xfer) +{ + unsigned int count; + int word_len; + struct orion_spi *orion_spi; + int cs = spi->chip_select; + void __iomem *vaddr; + + word_len = spi->bits_per_word; + count = xfer->len; + + orion_spi = spi_master_get_devdata(spi->master); + + /* + * Use SPI direct write mode if base address is available. Otherwise + * fall back to PIO mode for this transfer. + */ + vaddr = orion_spi->child[cs].direct_access.vaddr; + + if (vaddr && xfer->tx_buf && word_len == 8) { + unsigned int cnt = count / 4; + unsigned int rem = count % 4; + + /* + * Send the TX-data to the SPI device via the direct + * mapped address window + */ + iowrite32_rep(vaddr, xfer->tx_buf, cnt); + if (rem) { + u32 *buf = (u32 *)xfer->tx_buf; + + iowrite8_rep(vaddr, &buf[cnt], rem); + } + + return count; + } + + if (word_len == 8) { + const u8 *tx = xfer->tx_buf; + u8 *rx = xfer->rx_buf; + + do { + if (orion_spi_write_read_8bit(spi, &tx, &rx) < 0) + goto out; + count--; + spi_delay_exec(&xfer->word_delay, xfer); + } while (count); + } else if (word_len == 16) { + const u16 *tx = xfer->tx_buf; + u16 *rx = xfer->rx_buf; + + do { + if (orion_spi_write_read_16bit(spi, &tx, &rx) < 0) + goto out; + count -= 2; + spi_delay_exec(&xfer->word_delay, xfer); + } while (count); + } + +out: + return xfer->len - count; +} + +static int orion_spi_transfer_one(struct spi_master *master, + struct spi_device *spi, + struct spi_transfer *t) +{ + int status = 0; + + status = orion_spi_setup_transfer(spi, t); + if (status < 0) + return status; + + if (t->len) + orion_spi_write_read(spi, t); + + return status; +} + +static int orion_spi_setup(struct spi_device *spi) +{ + return orion_spi_setup_transfer(spi, NULL); +} + +static int orion_spi_reset(struct orion_spi *orion_spi) +{ + /* Verify that the CS is deasserted */ + orion_spi_clrbits(orion_spi, ORION_SPI_IF_CTRL_REG, 0x1); + + /* Don't deassert CS between the direct mapped SPI transfers */ + writel(0, spi_reg(orion_spi, SPI_DIRECT_WRITE_CONFIG_REG)); + + return 0; +} + +static const struct orion_spi_dev orion_spi_dev_data = { + .typ = ORION_SPI, + .min_divisor = 4, + .max_divisor = 30, + .prescale_mask = ORION_SPI_CLK_PRESCALE_MASK, +}; + +static const struct orion_spi_dev armada_370_spi_dev_data = { + .typ = ARMADA_SPI, + .min_divisor = 4, + .max_divisor = 1920, + .max_hz = 50000000, + .prescale_mask = ARMADA_SPI_CLK_PRESCALE_MASK, +}; + +static const struct orion_spi_dev armada_xp_spi_dev_data = { + .typ = ARMADA_SPI, + .max_hz = 50000000, + .max_divisor = 1920, + .prescale_mask = ARMADA_SPI_CLK_PRESCALE_MASK, +}; + +static const struct orion_spi_dev armada_375_spi_dev_data = { + .typ = ARMADA_SPI, + .min_divisor = 15, + .max_divisor = 1920, + .prescale_mask = ARMADA_SPI_CLK_PRESCALE_MASK, +}; + +static const struct orion_spi_dev armada_380_spi_dev_data = { + .typ = ARMADA_SPI, + .max_hz = 50000000, + .max_divisor = 1920, + .prescale_mask = ARMADA_SPI_CLK_PRESCALE_MASK, + .is_errata_50mhz_ac = true, +}; + +static const struct of_device_id orion_spi_of_match_table[] = { + { + .compatible = "marvell,orion-spi", + .data = &orion_spi_dev_data, + }, + { + .compatible = "marvell,armada-370-spi", + .data = &armada_370_spi_dev_data, + }, + { + .compatible = "marvell,armada-375-spi", + .data = &armada_375_spi_dev_data, + }, + { + .compatible = "marvell,armada-380-spi", + .data = &armada_380_spi_dev_data, + }, + { + .compatible = "marvell,armada-390-spi", + .data = &armada_xp_spi_dev_data, + }, + { + .compatible = "marvell,armada-xp-spi", + .data = &armada_xp_spi_dev_data, + }, + + {} +}; +MODULE_DEVICE_TABLE(of, orion_spi_of_match_table); + +static int orion_spi_probe(struct platform_device *pdev) +{ + const struct of_device_id *of_id; + const struct orion_spi_dev *devdata; + struct spi_master *master; + struct orion_spi *spi; + struct resource *r; + unsigned long tclk_hz; + int status = 0; + struct device_node *np; + + master = spi_alloc_master(&pdev->dev, sizeof(*spi)); + if (master == NULL) { + dev_dbg(&pdev->dev, "master allocation failed\n"); + return -ENOMEM; + } + + if (pdev->id != -1) + master->bus_num = pdev->id; + if (pdev->dev.of_node) { + u32 cell_index; + + if (!of_property_read_u32(pdev->dev.of_node, "cell-index", + &cell_index)) + master->bus_num = cell_index; + } + + /* we support all 4 SPI modes and LSB first option */ + master->mode_bits = SPI_CPHA | SPI_CPOL | SPI_LSB_FIRST; + master->set_cs = orion_spi_set_cs; + master->transfer_one = orion_spi_transfer_one; + master->num_chipselect = ORION_NUM_CHIPSELECTS; + master->setup = orion_spi_setup; + master->bits_per_word_mask = SPI_BPW_MASK(8) | SPI_BPW_MASK(16); + master->auto_runtime_pm = true; + master->use_gpio_descriptors = true; + master->flags = SPI_MASTER_GPIO_SS; + + platform_set_drvdata(pdev, master); + + spi = spi_master_get_devdata(master); + spi->master = master; + + of_id = of_match_device(orion_spi_of_match_table, &pdev->dev); + devdata = (of_id) ? of_id->data : &orion_spi_dev_data; + spi->devdata = devdata; + + spi->clk = devm_clk_get(&pdev->dev, NULL); + if (IS_ERR(spi->clk)) { + status = PTR_ERR(spi->clk); + goto out; + } + + status = clk_prepare_enable(spi->clk); + if (status) + goto out; + + /* The following clock is only used by some SoCs */ + spi->axi_clk = devm_clk_get(&pdev->dev, "axi"); + if (PTR_ERR(spi->axi_clk) == -EPROBE_DEFER) { + status = -EPROBE_DEFER; + goto out_rel_clk; + } + if (!IS_ERR(spi->axi_clk)) + clk_prepare_enable(spi->axi_clk); + + tclk_hz = clk_get_rate(spi->clk); + + /* + * With old device tree, armada-370-spi could be used with + * Armada XP, however for this SoC the maximum frequency is + * 50MHz instead of tclk/4. On Armada 370, tclk cannot be + * higher than 200MHz. So, in order to be able to handle both + * SoCs, we can take the minimum of 50MHz and tclk/4. + */ + if (of_device_is_compatible(pdev->dev.of_node, + "marvell,armada-370-spi")) + master->max_speed_hz = min(devdata->max_hz, + DIV_ROUND_UP(tclk_hz, devdata->min_divisor)); + else if (devdata->min_divisor) + master->max_speed_hz = + DIV_ROUND_UP(tclk_hz, devdata->min_divisor); + else + master->max_speed_hz = devdata->max_hz; + master->min_speed_hz = DIV_ROUND_UP(tclk_hz, devdata->max_divisor); + + r = platform_get_resource(pdev, IORESOURCE_MEM, 0); + spi->base = devm_ioremap_resource(&pdev->dev, r); + if (IS_ERR(spi->base)) { + status = PTR_ERR(spi->base); + goto out_rel_axi_clk; + } + + for_each_available_child_of_node(pdev->dev.of_node, np) { + struct orion_direct_acc *dir_acc; + u32 cs; + + /* Get chip-select number from the "reg" property */ + status = of_property_read_u32(np, "reg", &cs); + if (status) { + dev_err(&pdev->dev, + "%pOF has no valid 'reg' property (%d)\n", + np, status); + continue; + } + + /* + * Check if an address is configured for this SPI device. If + * not, the MBus mapping via the 'ranges' property in the 'soc' + * node is not configured and this device should not use the + * direct mode. In this case, just continue with the next + * device. + */ + status = of_address_to_resource(pdev->dev.of_node, cs + 1, r); + if (status) + continue; + + /* + * Only map one page for direct access. This is enough for the + * simple TX transfer which only writes to the first word. + * This needs to get extended for the direct SPI NOR / SPI NAND + * support, once this gets implemented. + */ + dir_acc = &spi->child[cs].direct_access; + dir_acc->vaddr = devm_ioremap(&pdev->dev, r->start, PAGE_SIZE); + if (!dir_acc->vaddr) { + status = -ENOMEM; + goto out_rel_axi_clk; + } + dir_acc->size = PAGE_SIZE; + + dev_info(&pdev->dev, "CS%d configured for direct access\n", cs); + } + + pm_runtime_set_active(&pdev->dev); + pm_runtime_use_autosuspend(&pdev->dev); + pm_runtime_set_autosuspend_delay(&pdev->dev, SPI_AUTOSUSPEND_TIMEOUT); + pm_runtime_enable(&pdev->dev); + + status = orion_spi_reset(spi); + if (status < 0) + goto out_rel_pm; + + master->dev.of_node = pdev->dev.of_node; + status = spi_register_master(master); + if (status < 0) + goto out_rel_pm; + + return status; + +out_rel_pm: + pm_runtime_disable(&pdev->dev); +out_rel_axi_clk: + clk_disable_unprepare(spi->axi_clk); +out_rel_clk: + clk_disable_unprepare(spi->clk); +out: + spi_master_put(master); + return status; +} + + +static int orion_spi_remove(struct platform_device *pdev) +{ + struct spi_master *master = platform_get_drvdata(pdev); + struct orion_spi *spi = spi_master_get_devdata(master); + + pm_runtime_get_sync(&pdev->dev); + clk_disable_unprepare(spi->axi_clk); + clk_disable_unprepare(spi->clk); + + spi_unregister_master(master); + pm_runtime_disable(&pdev->dev); + + return 0; +} + +MODULE_ALIAS("platform:" DRIVER_NAME); + +#ifdef CONFIG_PM +static int orion_spi_runtime_suspend(struct device *dev) +{ + struct spi_master *master = dev_get_drvdata(dev); + struct orion_spi *spi = spi_master_get_devdata(master); + + clk_disable_unprepare(spi->axi_clk); + clk_disable_unprepare(spi->clk); + return 0; +} + +static int orion_spi_runtime_resume(struct device *dev) +{ + struct spi_master *master = dev_get_drvdata(dev); + struct orion_spi *spi = spi_master_get_devdata(master); + + if (!IS_ERR(spi->axi_clk)) + clk_prepare_enable(spi->axi_clk); + return clk_prepare_enable(spi->clk); +} +#endif + +static const struct dev_pm_ops orion_spi_pm_ops = { + SET_RUNTIME_PM_OPS(orion_spi_runtime_suspend, + orion_spi_runtime_resume, + NULL) +}; + +static struct platform_driver orion_spi_driver = { + .driver = { + .name = DRIVER_NAME, + .pm = &orion_spi_pm_ops, + .of_match_table = of_match_ptr(orion_spi_of_match_table), + }, + .probe = orion_spi_probe, + .remove = orion_spi_remove, +}; + +module_platform_driver(orion_spi_driver); + +MODULE_DESCRIPTION("Orion SPI driver"); +MODULE_AUTHOR("Shadi Ammouri <shadi@marvell.com>"); +MODULE_LICENSE("GPL"); diff --git a/drivers/spi/spi-pic32-sqi.c b/drivers/spi/spi-pic32-sqi.c new file mode 100644 index 000000000..86ad17597 --- /dev/null +++ b/drivers/spi/spi-pic32-sqi.c @@ -0,0 +1,715 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * PIC32 Quad SPI controller driver. + * + * Purna Chandra Mandal <purna.mandal@microchip.com> + * Copyright (c) 2016, Microchip Technology Inc. + */ + +#include <linux/clk.h> +#include <linux/dma-mapping.h> +#include <linux/interrupt.h> +#include <linux/io.h> +#include <linux/iopoll.h> +#include <linux/module.h> +#include <linux/of.h> +#include <linux/platform_device.h> +#include <linux/slab.h> +#include <linux/spi/spi.h> + +/* SQI registers */ +#define PESQI_XIP_CONF1_REG 0x00 +#define PESQI_XIP_CONF2_REG 0x04 +#define PESQI_CONF_REG 0x08 +#define PESQI_CTRL_REG 0x0C +#define PESQI_CLK_CTRL_REG 0x10 +#define PESQI_CMD_THRES_REG 0x14 +#define PESQI_INT_THRES_REG 0x18 +#define PESQI_INT_ENABLE_REG 0x1C +#define PESQI_INT_STAT_REG 0x20 +#define PESQI_TX_DATA_REG 0x24 +#define PESQI_RX_DATA_REG 0x28 +#define PESQI_STAT1_REG 0x2C +#define PESQI_STAT2_REG 0x30 +#define PESQI_BD_CTRL_REG 0x34 +#define PESQI_BD_CUR_ADDR_REG 0x38 +#define PESQI_BD_BASE_ADDR_REG 0x40 +#define PESQI_BD_STAT_REG 0x44 +#define PESQI_BD_POLL_CTRL_REG 0x48 +#define PESQI_BD_TX_DMA_STAT_REG 0x4C +#define PESQI_BD_RX_DMA_STAT_REG 0x50 +#define PESQI_THRES_REG 0x54 +#define PESQI_INT_SIGEN_REG 0x58 + +/* PESQI_CONF_REG fields */ +#define PESQI_MODE 0x7 +#define PESQI_MODE_BOOT 0 +#define PESQI_MODE_PIO 1 +#define PESQI_MODE_DMA 2 +#define PESQI_MODE_XIP 3 +#define PESQI_MODE_SHIFT 0 +#define PESQI_CPHA BIT(3) +#define PESQI_CPOL BIT(4) +#define PESQI_LSBF BIT(5) +#define PESQI_RXLATCH BIT(7) +#define PESQI_SERMODE BIT(8) +#define PESQI_WP_EN BIT(9) +#define PESQI_HOLD_EN BIT(10) +#define PESQI_BURST_EN BIT(12) +#define PESQI_CS_CTRL_HW BIT(15) +#define PESQI_SOFT_RESET BIT(16) +#define PESQI_LANES_SHIFT 20 +#define PESQI_SINGLE_LANE 0 +#define PESQI_DUAL_LANE 1 +#define PESQI_QUAD_LANE 2 +#define PESQI_CSEN_SHIFT 24 +#define PESQI_EN BIT(23) + +/* PESQI_CLK_CTRL_REG fields */ +#define PESQI_CLK_EN BIT(0) +#define PESQI_CLK_STABLE BIT(1) +#define PESQI_CLKDIV_SHIFT 8 +#define PESQI_CLKDIV 0xff + +/* PESQI_INT_THR/CMD_THR_REG */ +#define PESQI_TXTHR_MASK 0x1f +#define PESQI_TXTHR_SHIFT 8 +#define PESQI_RXTHR_MASK 0x1f +#define PESQI_RXTHR_SHIFT 0 + +/* PESQI_INT_EN/INT_STAT/INT_SIG_EN_REG */ +#define PESQI_TXEMPTY BIT(0) +#define PESQI_TXFULL BIT(1) +#define PESQI_TXTHR BIT(2) +#define PESQI_RXEMPTY BIT(3) +#define PESQI_RXFULL BIT(4) +#define PESQI_RXTHR BIT(5) +#define PESQI_BDDONE BIT(9) /* BD processing complete */ +#define PESQI_PKTCOMP BIT(10) /* packet processing complete */ +#define PESQI_DMAERR BIT(11) /* error */ + +/* PESQI_BD_CTRL_REG */ +#define PESQI_DMA_EN BIT(0) /* enable DMA engine */ +#define PESQI_POLL_EN BIT(1) /* enable polling */ +#define PESQI_BDP_START BIT(2) /* start BD processor */ + +/* PESQI controller buffer descriptor */ +struct buf_desc { + u32 bd_ctrl; /* control */ + u32 bd_status; /* reserved */ + u32 bd_addr; /* DMA buffer addr */ + u32 bd_nextp; /* next item in chain */ +}; + +/* bd_ctrl */ +#define BD_BUFLEN 0x1ff +#define BD_CBD_INT_EN BIT(16) /* Current BD is processed */ +#define BD_PKT_INT_EN BIT(17) /* All BDs of PKT processed */ +#define BD_LIFM BIT(18) /* last data of pkt */ +#define BD_LAST BIT(19) /* end of list */ +#define BD_DATA_RECV BIT(20) /* receive data */ +#define BD_DDR BIT(21) /* DDR mode */ +#define BD_DUAL BIT(22) /* Dual SPI */ +#define BD_QUAD BIT(23) /* Quad SPI */ +#define BD_LSBF BIT(25) /* LSB First */ +#define BD_STAT_CHECK BIT(27) /* Status poll */ +#define BD_DEVSEL_SHIFT 28 /* CS */ +#define BD_CS_DEASSERT BIT(30) /* de-assert CS after current BD */ +#define BD_EN BIT(31) /* BD owned by H/W */ + +/** + * struct ring_desc - Representation of SQI ring descriptor + * @list: list element to add to free or used list. + * @bd: PESQI controller buffer descriptor + * @bd_dma: DMA address of PESQI controller buffer descriptor + * @xfer_len: transfer length + */ +struct ring_desc { + struct list_head list; + struct buf_desc *bd; + dma_addr_t bd_dma; + u32 xfer_len; +}; + +/* Global constants */ +#define PESQI_BD_BUF_LEN_MAX 256 +#define PESQI_BD_COUNT 256 /* max 64KB data per spi message */ + +struct pic32_sqi { + void __iomem *regs; + struct clk *sys_clk; + struct clk *base_clk; /* drives spi clock */ + struct spi_master *master; + int irq; + struct completion xfer_done; + struct ring_desc *ring; + void *bd; + dma_addr_t bd_dma; + struct list_head bd_list_free; /* free */ + struct list_head bd_list_used; /* allocated */ + struct spi_device *cur_spi; + u32 cur_speed; + u8 cur_mode; +}; + +static inline void pic32_setbits(void __iomem *reg, u32 set) +{ + writel(readl(reg) | set, reg); +} + +static inline void pic32_clrbits(void __iomem *reg, u32 clr) +{ + writel(readl(reg) & ~clr, reg); +} + +static int pic32_sqi_set_clk_rate(struct pic32_sqi *sqi, u32 sck) +{ + u32 val, div; + + /* div = base_clk / (2 * spi_clk) */ + div = clk_get_rate(sqi->base_clk) / (2 * sck); + div &= PESQI_CLKDIV; + + val = readl(sqi->regs + PESQI_CLK_CTRL_REG); + /* apply new divider */ + val &= ~(PESQI_CLK_STABLE | (PESQI_CLKDIV << PESQI_CLKDIV_SHIFT)); + val |= div << PESQI_CLKDIV_SHIFT; + writel(val, sqi->regs + PESQI_CLK_CTRL_REG); + + /* wait for stability */ + return readl_poll_timeout(sqi->regs + PESQI_CLK_CTRL_REG, val, + val & PESQI_CLK_STABLE, 1, 5000); +} + +static inline void pic32_sqi_enable_int(struct pic32_sqi *sqi) +{ + u32 mask = PESQI_DMAERR | PESQI_BDDONE | PESQI_PKTCOMP; + + writel(mask, sqi->regs + PESQI_INT_ENABLE_REG); + /* INT_SIGEN works as interrupt-gate to INTR line */ + writel(mask, sqi->regs + PESQI_INT_SIGEN_REG); +} + +static inline void pic32_sqi_disable_int(struct pic32_sqi *sqi) +{ + writel(0, sqi->regs + PESQI_INT_ENABLE_REG); + writel(0, sqi->regs + PESQI_INT_SIGEN_REG); +} + +static irqreturn_t pic32_sqi_isr(int irq, void *dev_id) +{ + struct pic32_sqi *sqi = dev_id; + u32 enable, status; + + enable = readl(sqi->regs + PESQI_INT_ENABLE_REG); + status = readl(sqi->regs + PESQI_INT_STAT_REG); + + /* check spurious interrupt */ + if (!status) + return IRQ_NONE; + + if (status & PESQI_DMAERR) { + enable = 0; + goto irq_done; + } + + if (status & PESQI_TXTHR) + enable &= ~(PESQI_TXTHR | PESQI_TXFULL | PESQI_TXEMPTY); + + if (status & PESQI_RXTHR) + enable &= ~(PESQI_RXTHR | PESQI_RXFULL | PESQI_RXEMPTY); + + if (status & PESQI_BDDONE) + enable &= ~PESQI_BDDONE; + + /* packet processing completed */ + if (status & PESQI_PKTCOMP) { + /* mask all interrupts */ + enable = 0; + /* complete trasaction */ + complete(&sqi->xfer_done); + } + +irq_done: + /* interrupts are sticky, so mask when handled */ + writel(enable, sqi->regs + PESQI_INT_ENABLE_REG); + + return IRQ_HANDLED; +} + +static struct ring_desc *ring_desc_get(struct pic32_sqi *sqi) +{ + struct ring_desc *rdesc; + + if (list_empty(&sqi->bd_list_free)) + return NULL; + + rdesc = list_first_entry(&sqi->bd_list_free, struct ring_desc, list); + list_move_tail(&rdesc->list, &sqi->bd_list_used); + return rdesc; +} + +static void ring_desc_put(struct pic32_sqi *sqi, struct ring_desc *rdesc) +{ + list_move(&rdesc->list, &sqi->bd_list_free); +} + +static int pic32_sqi_one_transfer(struct pic32_sqi *sqi, + struct spi_message *mesg, + struct spi_transfer *xfer) +{ + struct spi_device *spi = mesg->spi; + struct scatterlist *sg, *sgl; + struct ring_desc *rdesc; + struct buf_desc *bd; + int nents, i; + u32 bd_ctrl; + u32 nbits; + + /* Device selection */ + bd_ctrl = spi->chip_select << BD_DEVSEL_SHIFT; + + /* half-duplex: select transfer buffer, direction and lane */ + if (xfer->rx_buf) { + bd_ctrl |= BD_DATA_RECV; + nbits = xfer->rx_nbits; + sgl = xfer->rx_sg.sgl; + nents = xfer->rx_sg.nents; + } else { + nbits = xfer->tx_nbits; + sgl = xfer->tx_sg.sgl; + nents = xfer->tx_sg.nents; + } + + if (nbits & SPI_NBITS_QUAD) + bd_ctrl |= BD_QUAD; + else if (nbits & SPI_NBITS_DUAL) + bd_ctrl |= BD_DUAL; + + /* LSB first */ + if (spi->mode & SPI_LSB_FIRST) + bd_ctrl |= BD_LSBF; + + /* ownership to hardware */ + bd_ctrl |= BD_EN; + + for_each_sg(sgl, sg, nents, i) { + /* get ring descriptor */ + rdesc = ring_desc_get(sqi); + if (!rdesc) + break; + + bd = rdesc->bd; + + /* BD CTRL: length */ + rdesc->xfer_len = sg_dma_len(sg); + bd->bd_ctrl = bd_ctrl; + bd->bd_ctrl |= rdesc->xfer_len; + + /* BD STAT */ + bd->bd_status = 0; + + /* BD BUFFER ADDRESS */ + bd->bd_addr = sg->dma_address; + } + + return 0; +} + +static int pic32_sqi_prepare_hardware(struct spi_master *master) +{ + struct pic32_sqi *sqi = spi_master_get_devdata(master); + + /* enable spi interface */ + pic32_setbits(sqi->regs + PESQI_CONF_REG, PESQI_EN); + /* enable spi clk */ + pic32_setbits(sqi->regs + PESQI_CLK_CTRL_REG, PESQI_CLK_EN); + + return 0; +} + +static bool pic32_sqi_can_dma(struct spi_master *master, + struct spi_device *spi, + struct spi_transfer *x) +{ + /* Do DMA irrespective of transfer size */ + return true; +} + +static int pic32_sqi_one_message(struct spi_master *master, + struct spi_message *msg) +{ + struct spi_device *spi = msg->spi; + struct ring_desc *rdesc, *next; + struct spi_transfer *xfer; + struct pic32_sqi *sqi; + int ret = 0, mode; + unsigned long timeout; + u32 val; + + sqi = spi_master_get_devdata(master); + + reinit_completion(&sqi->xfer_done); + msg->actual_length = 0; + + /* We can't handle spi_transfer specific "speed_hz", "bits_per_word" + * and "delay_usecs". But spi_device specific speed and mode change + * can be handled at best during spi chip-select switch. + */ + if (sqi->cur_spi != spi) { + /* set spi speed */ + if (sqi->cur_speed != spi->max_speed_hz) { + sqi->cur_speed = spi->max_speed_hz; + ret = pic32_sqi_set_clk_rate(sqi, spi->max_speed_hz); + if (ret) + dev_warn(&spi->dev, "set_clk, %d\n", ret); + } + + /* set spi mode */ + mode = spi->mode & (SPI_MODE_3 | SPI_LSB_FIRST); + if (sqi->cur_mode != mode) { + val = readl(sqi->regs + PESQI_CONF_REG); + val &= ~(PESQI_CPOL | PESQI_CPHA | PESQI_LSBF); + if (mode & SPI_CPOL) + val |= PESQI_CPOL; + if (mode & SPI_LSB_FIRST) + val |= PESQI_LSBF; + val |= PESQI_CPHA; + writel(val, sqi->regs + PESQI_CONF_REG); + + sqi->cur_mode = mode; + } + sqi->cur_spi = spi; + } + + /* prepare hardware desc-list(BD) for transfer(s) */ + list_for_each_entry(xfer, &msg->transfers, transfer_list) { + ret = pic32_sqi_one_transfer(sqi, msg, xfer); + if (ret) { + dev_err(&spi->dev, "xfer %p err\n", xfer); + goto xfer_out; + } + } + + /* BDs are prepared and chained. Now mark LAST_BD, CS_DEASSERT at last + * element of the list. + */ + rdesc = list_last_entry(&sqi->bd_list_used, struct ring_desc, list); + rdesc->bd->bd_ctrl |= BD_LAST | BD_CS_DEASSERT | + BD_LIFM | BD_PKT_INT_EN; + + /* set base address BD list for DMA engine */ + rdesc = list_first_entry(&sqi->bd_list_used, struct ring_desc, list); + writel(rdesc->bd_dma, sqi->regs + PESQI_BD_BASE_ADDR_REG); + + /* enable interrupt */ + pic32_sqi_enable_int(sqi); + + /* enable DMA engine */ + val = PESQI_DMA_EN | PESQI_POLL_EN | PESQI_BDP_START; + writel(val, sqi->regs + PESQI_BD_CTRL_REG); + + /* wait for xfer completion */ + timeout = wait_for_completion_timeout(&sqi->xfer_done, 5 * HZ); + if (timeout == 0) { + dev_err(&sqi->master->dev, "wait timedout/interrupted\n"); + ret = -ETIMEDOUT; + msg->status = ret; + } else { + /* success */ + msg->status = 0; + ret = 0; + } + + /* disable DMA */ + writel(0, sqi->regs + PESQI_BD_CTRL_REG); + + pic32_sqi_disable_int(sqi); + +xfer_out: + list_for_each_entry_safe_reverse(rdesc, next, + &sqi->bd_list_used, list) { + /* Update total byte transferred */ + msg->actual_length += rdesc->xfer_len; + /* release ring descr */ + ring_desc_put(sqi, rdesc); + } + spi_finalize_current_message(spi->master); + + return ret; +} + +static int pic32_sqi_unprepare_hardware(struct spi_master *master) +{ + struct pic32_sqi *sqi = spi_master_get_devdata(master); + + /* disable clk */ + pic32_clrbits(sqi->regs + PESQI_CLK_CTRL_REG, PESQI_CLK_EN); + /* disable spi */ + pic32_clrbits(sqi->regs + PESQI_CONF_REG, PESQI_EN); + + return 0; +} + +static int ring_desc_ring_alloc(struct pic32_sqi *sqi) +{ + struct ring_desc *rdesc; + struct buf_desc *bd; + int i; + + /* allocate coherent DMAable memory for hardware buffer descriptors. */ + sqi->bd = dma_alloc_coherent(&sqi->master->dev, + sizeof(*bd) * PESQI_BD_COUNT, + &sqi->bd_dma, GFP_KERNEL); + if (!sqi->bd) { + dev_err(&sqi->master->dev, "failed allocating dma buffer\n"); + return -ENOMEM; + } + + /* allocate software ring descriptors */ + sqi->ring = kcalloc(PESQI_BD_COUNT, sizeof(*rdesc), GFP_KERNEL); + if (!sqi->ring) { + dma_free_coherent(&sqi->master->dev, + sizeof(*bd) * PESQI_BD_COUNT, + sqi->bd, sqi->bd_dma); + return -ENOMEM; + } + + bd = (struct buf_desc *)sqi->bd; + + INIT_LIST_HEAD(&sqi->bd_list_free); + INIT_LIST_HEAD(&sqi->bd_list_used); + + /* initialize ring-desc */ + for (i = 0, rdesc = sqi->ring; i < PESQI_BD_COUNT; i++, rdesc++) { + INIT_LIST_HEAD(&rdesc->list); + rdesc->bd = &bd[i]; + rdesc->bd_dma = sqi->bd_dma + (void *)&bd[i] - (void *)bd; + list_add_tail(&rdesc->list, &sqi->bd_list_free); + } + + /* Prepare BD: chain to next BD(s) */ + for (i = 0, rdesc = sqi->ring; i < PESQI_BD_COUNT - 1; i++) + bd[i].bd_nextp = rdesc[i + 1].bd_dma; + bd[PESQI_BD_COUNT - 1].bd_nextp = 0; + + return 0; +} + +static void ring_desc_ring_free(struct pic32_sqi *sqi) +{ + dma_free_coherent(&sqi->master->dev, + sizeof(struct buf_desc) * PESQI_BD_COUNT, + sqi->bd, sqi->bd_dma); + kfree(sqi->ring); +} + +static void pic32_sqi_hw_init(struct pic32_sqi *sqi) +{ + unsigned long flags; + u32 val; + + /* Soft-reset of PESQI controller triggers interrupt. + * We are not yet ready to handle them so disable CPU + * interrupt for the time being. + */ + local_irq_save(flags); + + /* assert soft-reset */ + writel(PESQI_SOFT_RESET, sqi->regs + PESQI_CONF_REG); + + /* wait until clear */ + readl_poll_timeout_atomic(sqi->regs + PESQI_CONF_REG, val, + !(val & PESQI_SOFT_RESET), 1, 5000); + + /* disable all interrupts */ + pic32_sqi_disable_int(sqi); + + /* Now it is safe to enable back CPU interrupt */ + local_irq_restore(flags); + + /* tx and rx fifo interrupt threshold */ + val = readl(sqi->regs + PESQI_CMD_THRES_REG); + val &= ~(PESQI_TXTHR_MASK << PESQI_TXTHR_SHIFT); + val &= ~(PESQI_RXTHR_MASK << PESQI_RXTHR_SHIFT); + val |= (1U << PESQI_TXTHR_SHIFT) | (1U << PESQI_RXTHR_SHIFT); + writel(val, sqi->regs + PESQI_CMD_THRES_REG); + + val = readl(sqi->regs + PESQI_INT_THRES_REG); + val &= ~(PESQI_TXTHR_MASK << PESQI_TXTHR_SHIFT); + val &= ~(PESQI_RXTHR_MASK << PESQI_RXTHR_SHIFT); + val |= (1U << PESQI_TXTHR_SHIFT) | (1U << PESQI_RXTHR_SHIFT); + writel(val, sqi->regs + PESQI_INT_THRES_REG); + + /* default configuration */ + val = readl(sqi->regs + PESQI_CONF_REG); + + /* set mode: DMA */ + val &= ~PESQI_MODE; + val |= PESQI_MODE_DMA << PESQI_MODE_SHIFT; + writel(val, sqi->regs + PESQI_CONF_REG); + + /* DATAEN - SQIID0-ID3 */ + val |= PESQI_QUAD_LANE << PESQI_LANES_SHIFT; + + /* burst/INCR4 enable */ + val |= PESQI_BURST_EN; + + /* CSEN - all CS */ + val |= 3U << PESQI_CSEN_SHIFT; + writel(val, sqi->regs + PESQI_CONF_REG); + + /* write poll count */ + writel(0, sqi->regs + PESQI_BD_POLL_CTRL_REG); + + sqi->cur_speed = 0; + sqi->cur_mode = -1; +} + +static int pic32_sqi_probe(struct platform_device *pdev) +{ + struct spi_master *master; + struct pic32_sqi *sqi; + int ret; + + master = spi_alloc_master(&pdev->dev, sizeof(*sqi)); + if (!master) + return -ENOMEM; + + sqi = spi_master_get_devdata(master); + sqi->master = master; + + sqi->regs = devm_platform_ioremap_resource(pdev, 0); + if (IS_ERR(sqi->regs)) { + ret = PTR_ERR(sqi->regs); + goto err_free_master; + } + + /* irq */ + sqi->irq = platform_get_irq(pdev, 0); + if (sqi->irq < 0) { + ret = sqi->irq; + goto err_free_master; + } + + /* clocks */ + sqi->sys_clk = devm_clk_get(&pdev->dev, "reg_ck"); + if (IS_ERR(sqi->sys_clk)) { + ret = PTR_ERR(sqi->sys_clk); + dev_err(&pdev->dev, "no sys_clk ?\n"); + goto err_free_master; + } + + sqi->base_clk = devm_clk_get(&pdev->dev, "spi_ck"); + if (IS_ERR(sqi->base_clk)) { + ret = PTR_ERR(sqi->base_clk); + dev_err(&pdev->dev, "no base clk ?\n"); + goto err_free_master; + } + + ret = clk_prepare_enable(sqi->sys_clk); + if (ret) { + dev_err(&pdev->dev, "sys clk enable failed\n"); + goto err_free_master; + } + + ret = clk_prepare_enable(sqi->base_clk); + if (ret) { + dev_err(&pdev->dev, "base clk enable failed\n"); + clk_disable_unprepare(sqi->sys_clk); + goto err_free_master; + } + + init_completion(&sqi->xfer_done); + + /* initialize hardware */ + pic32_sqi_hw_init(sqi); + + /* allocate buffers & descriptors */ + ret = ring_desc_ring_alloc(sqi); + if (ret) { + dev_err(&pdev->dev, "ring alloc failed\n"); + goto err_disable_clk; + } + + /* install irq handlers */ + ret = request_irq(sqi->irq, pic32_sqi_isr, 0, + dev_name(&pdev->dev), sqi); + if (ret < 0) { + dev_err(&pdev->dev, "request_irq(%d), failed\n", sqi->irq); + goto err_free_ring; + } + + /* register master */ + master->num_chipselect = 2; + master->max_speed_hz = clk_get_rate(sqi->base_clk); + master->dma_alignment = 32; + master->max_dma_len = PESQI_BD_BUF_LEN_MAX; + master->dev.of_node = pdev->dev.of_node; + master->mode_bits = SPI_MODE_3 | SPI_MODE_0 | SPI_TX_DUAL | + SPI_RX_DUAL | SPI_TX_QUAD | SPI_RX_QUAD; + master->flags = SPI_MASTER_HALF_DUPLEX; + master->can_dma = pic32_sqi_can_dma; + master->bits_per_word_mask = SPI_BPW_RANGE_MASK(8, 32); + master->transfer_one_message = pic32_sqi_one_message; + master->prepare_transfer_hardware = pic32_sqi_prepare_hardware; + master->unprepare_transfer_hardware = pic32_sqi_unprepare_hardware; + + ret = devm_spi_register_master(&pdev->dev, master); + if (ret) { + dev_err(&master->dev, "failed registering spi master\n"); + free_irq(sqi->irq, sqi); + goto err_free_ring; + } + + platform_set_drvdata(pdev, sqi); + + return 0; + +err_free_ring: + ring_desc_ring_free(sqi); + +err_disable_clk: + clk_disable_unprepare(sqi->base_clk); + clk_disable_unprepare(sqi->sys_clk); + +err_free_master: + spi_master_put(master); + return ret; +} + +static int pic32_sqi_remove(struct platform_device *pdev) +{ + struct pic32_sqi *sqi = platform_get_drvdata(pdev); + + /* release resources */ + free_irq(sqi->irq, sqi); + ring_desc_ring_free(sqi); + + /* disable clk */ + clk_disable_unprepare(sqi->base_clk); + clk_disable_unprepare(sqi->sys_clk); + + return 0; +} + +static const struct of_device_id pic32_sqi_of_ids[] = { + {.compatible = "microchip,pic32mzda-sqi",}, + {}, +}; +MODULE_DEVICE_TABLE(of, pic32_sqi_of_ids); + +static struct platform_driver pic32_sqi_driver = { + .driver = { + .name = "sqi-pic32", + .of_match_table = of_match_ptr(pic32_sqi_of_ids), + }, + .probe = pic32_sqi_probe, + .remove = pic32_sqi_remove, +}; + +module_platform_driver(pic32_sqi_driver); + +MODULE_AUTHOR("Purna Chandra Mandal <purna.mandal@microchip.com>"); +MODULE_DESCRIPTION("Microchip SPI driver for PIC32 SQI controller."); +MODULE_LICENSE("GPL v2"); diff --git a/drivers/spi/spi-pic32.c b/drivers/spi/spi-pic32.c new file mode 100644 index 000000000..5eb7b61bb --- /dev/null +++ b/drivers/spi/spi-pic32.c @@ -0,0 +1,881 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Microchip PIC32 SPI controller driver. + * + * Purna Chandra Mandal <purna.mandal@microchip.com> + * Copyright (c) 2016, Microchip Technology Inc. + */ + +#include <linux/clk.h> +#include <linux/clkdev.h> +#include <linux/delay.h> +#include <linux/dmaengine.h> +#include <linux/dma-mapping.h> +#include <linux/highmem.h> +#include <linux/module.h> +#include <linux/io.h> +#include <linux/interrupt.h> +#include <linux/of.h> +#include <linux/of_irq.h> +#include <linux/of_gpio.h> +#include <linux/of_address.h> +#include <linux/platform_device.h> +#include <linux/spi/spi.h> + +/* SPI controller registers */ +struct pic32_spi_regs { + u32 ctrl; + u32 ctrl_clr; + u32 ctrl_set; + u32 ctrl_inv; + u32 status; + u32 status_clr; + u32 status_set; + u32 status_inv; + u32 buf; + u32 dontuse[3]; + u32 baud; + u32 dontuse2[3]; + u32 ctrl2; + u32 ctrl2_clr; + u32 ctrl2_set; + u32 ctrl2_inv; +}; + +/* Bit fields of SPI Control Register */ +#define CTRL_RX_INT_SHIFT 0 /* Rx interrupt generation */ +#define RX_FIFO_EMPTY 0 +#define RX_FIFO_NOT_EMPTY 1 /* not empty */ +#define RX_FIFO_HALF_FULL 2 /* full by half or more */ +#define RX_FIFO_FULL 3 /* completely full */ + +#define CTRL_TX_INT_SHIFT 2 /* TX interrupt generation */ +#define TX_FIFO_ALL_EMPTY 0 /* completely empty */ +#define TX_FIFO_EMPTY 1 /* empty */ +#define TX_FIFO_HALF_EMPTY 2 /* empty by half or more */ +#define TX_FIFO_NOT_FULL 3 /* atleast one empty */ + +#define CTRL_MSTEN BIT(5) /* enable master mode */ +#define CTRL_CKP BIT(6) /* active low */ +#define CTRL_CKE BIT(8) /* Tx on falling edge */ +#define CTRL_SMP BIT(9) /* Rx at middle or end of tx */ +#define CTRL_BPW_MASK 0x03 /* bits per word/sample */ +#define CTRL_BPW_SHIFT 10 +#define PIC32_BPW_8 0 +#define PIC32_BPW_16 1 +#define PIC32_BPW_32 2 +#define CTRL_SIDL BIT(13) /* sleep when idle */ +#define CTRL_ON BIT(15) /* enable macro */ +#define CTRL_ENHBUF BIT(16) /* enable enhanced buffering */ +#define CTRL_MCLKSEL BIT(23) /* select clock source */ +#define CTRL_MSSEN BIT(28) /* macro driven /SS */ +#define CTRL_FRMEN BIT(31) /* enable framing mode */ + +/* Bit fields of SPI Status Register */ +#define STAT_RF_EMPTY BIT(5) /* RX Fifo empty */ +#define STAT_RX_OV BIT(6) /* err, s/w needs to clear */ +#define STAT_TX_UR BIT(8) /* UR in Framed SPI modes */ +#define STAT_FRM_ERR BIT(12) /* Multiple Frame Sync pulse */ +#define STAT_TF_LVL_MASK 0x1F +#define STAT_TF_LVL_SHIFT 16 +#define STAT_RF_LVL_MASK 0x1F +#define STAT_RF_LVL_SHIFT 24 + +/* Bit fields of SPI Baud Register */ +#define BAUD_MASK 0x1ff + +/* Bit fields of SPI Control2 Register */ +#define CTRL2_TX_UR_EN BIT(10) /* Enable int on Tx under-run */ +#define CTRL2_RX_OV_EN BIT(11) /* Enable int on Rx over-run */ +#define CTRL2_FRM_ERR_EN BIT(12) /* Enable frame err int */ + +/* Minimum DMA transfer size */ +#define PIC32_DMA_LEN_MIN 64 + +struct pic32_spi { + dma_addr_t dma_base; + struct pic32_spi_regs __iomem *regs; + int fault_irq; + int rx_irq; + int tx_irq; + u32 fifo_n_byte; /* FIFO depth in bytes */ + struct clk *clk; + struct spi_master *master; + /* Current controller setting */ + u32 speed_hz; /* spi-clk rate */ + u32 mode; + u32 bits_per_word; + u32 fifo_n_elm; /* FIFO depth in words */ +#define PIC32F_DMA_PREP 0 /* DMA chnls configured */ + unsigned long flags; + /* Current transfer state */ + struct completion xfer_done; + /* PIO transfer specific */ + const void *tx; + const void *tx_end; + const void *rx; + const void *rx_end; + int len; + void (*rx_fifo)(struct pic32_spi *); + void (*tx_fifo)(struct pic32_spi *); +}; + +static inline void pic32_spi_enable(struct pic32_spi *pic32s) +{ + writel(CTRL_ON | CTRL_SIDL, &pic32s->regs->ctrl_set); +} + +static inline void pic32_spi_disable(struct pic32_spi *pic32s) +{ + writel(CTRL_ON | CTRL_SIDL, &pic32s->regs->ctrl_clr); + + /* avoid SPI registers read/write at immediate next CPU clock */ + ndelay(20); +} + +static void pic32_spi_set_clk_rate(struct pic32_spi *pic32s, u32 spi_ck) +{ + u32 div; + + /* div = (clk_in / 2 * spi_ck) - 1 */ + div = DIV_ROUND_CLOSEST(clk_get_rate(pic32s->clk), 2 * spi_ck) - 1; + + writel(div & BAUD_MASK, &pic32s->regs->baud); +} + +static inline u32 pic32_rx_fifo_level(struct pic32_spi *pic32s) +{ + u32 sr = readl(&pic32s->regs->status); + + return (sr >> STAT_RF_LVL_SHIFT) & STAT_RF_LVL_MASK; +} + +static inline u32 pic32_tx_fifo_level(struct pic32_spi *pic32s) +{ + u32 sr = readl(&pic32s->regs->status); + + return (sr >> STAT_TF_LVL_SHIFT) & STAT_TF_LVL_MASK; +} + +/* Return the max entries we can fill into tx fifo */ +static u32 pic32_tx_max(struct pic32_spi *pic32s, int n_bytes) +{ + u32 tx_left, tx_room, rxtx_gap; + + tx_left = (pic32s->tx_end - pic32s->tx) / n_bytes; + tx_room = pic32s->fifo_n_elm - pic32_tx_fifo_level(pic32s); + + /* + * Another concern is about the tx/rx mismatch, we + * though to use (pic32s->fifo_n_byte - rxfl - txfl) as + * one maximum value for tx, but it doesn't cover the + * data which is out of tx/rx fifo and inside the + * shift registers. So a ctrl from sw point of + * view is taken. + */ + rxtx_gap = ((pic32s->rx_end - pic32s->rx) - + (pic32s->tx_end - pic32s->tx)) / n_bytes; + return min3(tx_left, tx_room, (u32)(pic32s->fifo_n_elm - rxtx_gap)); +} + +/* Return the max entries we should read out of rx fifo */ +static u32 pic32_rx_max(struct pic32_spi *pic32s, int n_bytes) +{ + u32 rx_left = (pic32s->rx_end - pic32s->rx) / n_bytes; + + return min_t(u32, rx_left, pic32_rx_fifo_level(pic32s)); +} + +#define BUILD_SPI_FIFO_RW(__name, __type, __bwl) \ +static void pic32_spi_rx_##__name(struct pic32_spi *pic32s) \ +{ \ + __type v; \ + u32 mx = pic32_rx_max(pic32s, sizeof(__type)); \ + for (; mx; mx--) { \ + v = read##__bwl(&pic32s->regs->buf); \ + if (pic32s->rx_end - pic32s->len) \ + *(__type *)(pic32s->rx) = v; \ + pic32s->rx += sizeof(__type); \ + } \ +} \ + \ +static void pic32_spi_tx_##__name(struct pic32_spi *pic32s) \ +{ \ + __type v; \ + u32 mx = pic32_tx_max(pic32s, sizeof(__type)); \ + for (; mx ; mx--) { \ + v = (__type)~0U; \ + if (pic32s->tx_end - pic32s->len) \ + v = *(__type *)(pic32s->tx); \ + write##__bwl(v, &pic32s->regs->buf); \ + pic32s->tx += sizeof(__type); \ + } \ +} + +BUILD_SPI_FIFO_RW(byte, u8, b); +BUILD_SPI_FIFO_RW(word, u16, w); +BUILD_SPI_FIFO_RW(dword, u32, l); + +static void pic32_err_stop(struct pic32_spi *pic32s, const char *msg) +{ + /* disable all interrupts */ + disable_irq_nosync(pic32s->fault_irq); + disable_irq_nosync(pic32s->rx_irq); + disable_irq_nosync(pic32s->tx_irq); + + /* Show err message and abort xfer with err */ + dev_err(&pic32s->master->dev, "%s\n", msg); + if (pic32s->master->cur_msg) + pic32s->master->cur_msg->status = -EIO; + complete(&pic32s->xfer_done); +} + +static irqreturn_t pic32_spi_fault_irq(int irq, void *dev_id) +{ + struct pic32_spi *pic32s = dev_id; + u32 status; + + status = readl(&pic32s->regs->status); + + /* Error handling */ + if (status & (STAT_RX_OV | STAT_TX_UR)) { + writel(STAT_RX_OV, &pic32s->regs->status_clr); + writel(STAT_TX_UR, &pic32s->regs->status_clr); + pic32_err_stop(pic32s, "err_irq: fifo ov/ur-run\n"); + return IRQ_HANDLED; + } + + if (status & STAT_FRM_ERR) { + pic32_err_stop(pic32s, "err_irq: frame error"); + return IRQ_HANDLED; + } + + if (!pic32s->master->cur_msg) { + pic32_err_stop(pic32s, "err_irq: no mesg"); + return IRQ_NONE; + } + + return IRQ_NONE; +} + +static irqreturn_t pic32_spi_rx_irq(int irq, void *dev_id) +{ + struct pic32_spi *pic32s = dev_id; + + pic32s->rx_fifo(pic32s); + + /* rx complete ? */ + if (pic32s->rx_end == pic32s->rx) { + /* disable all interrupts */ + disable_irq_nosync(pic32s->fault_irq); + disable_irq_nosync(pic32s->rx_irq); + + /* complete current xfer */ + complete(&pic32s->xfer_done); + } + + return IRQ_HANDLED; +} + +static irqreturn_t pic32_spi_tx_irq(int irq, void *dev_id) +{ + struct pic32_spi *pic32s = dev_id; + + pic32s->tx_fifo(pic32s); + + /* tx complete? disable tx interrupt */ + if (pic32s->tx_end == pic32s->tx) + disable_irq_nosync(pic32s->tx_irq); + + return IRQ_HANDLED; +} + +static void pic32_spi_dma_rx_notify(void *data) +{ + struct pic32_spi *pic32s = data; + + complete(&pic32s->xfer_done); +} + +static int pic32_spi_dma_transfer(struct pic32_spi *pic32s, + struct spi_transfer *xfer) +{ + struct spi_master *master = pic32s->master; + struct dma_async_tx_descriptor *desc_rx; + struct dma_async_tx_descriptor *desc_tx; + dma_cookie_t cookie; + int ret; + + if (!master->dma_rx || !master->dma_tx) + return -ENODEV; + + desc_rx = dmaengine_prep_slave_sg(master->dma_rx, + xfer->rx_sg.sgl, + xfer->rx_sg.nents, + DMA_DEV_TO_MEM, + DMA_PREP_INTERRUPT | DMA_CTRL_ACK); + if (!desc_rx) { + ret = -EINVAL; + goto err_dma; + } + + desc_tx = dmaengine_prep_slave_sg(master->dma_tx, + xfer->tx_sg.sgl, + xfer->tx_sg.nents, + DMA_MEM_TO_DEV, + DMA_PREP_INTERRUPT | DMA_CTRL_ACK); + if (!desc_tx) { + ret = -EINVAL; + goto err_dma; + } + + /* Put callback on the RX transfer, that should finish last */ + desc_rx->callback = pic32_spi_dma_rx_notify; + desc_rx->callback_param = pic32s; + + cookie = dmaengine_submit(desc_rx); + ret = dma_submit_error(cookie); + if (ret) + goto err_dma; + + cookie = dmaengine_submit(desc_tx); + ret = dma_submit_error(cookie); + if (ret) + goto err_dma_tx; + + dma_async_issue_pending(master->dma_rx); + dma_async_issue_pending(master->dma_tx); + + return 0; + +err_dma_tx: + dmaengine_terminate_all(master->dma_rx); +err_dma: + return ret; +} + +static int pic32_spi_dma_config(struct pic32_spi *pic32s, u32 dma_width) +{ + int buf_offset = offsetof(struct pic32_spi_regs, buf); + struct spi_master *master = pic32s->master; + struct dma_slave_config cfg; + int ret; + + memset(&cfg, 0, sizeof(cfg)); + cfg.device_fc = true; + cfg.src_addr = pic32s->dma_base + buf_offset; + cfg.dst_addr = pic32s->dma_base + buf_offset; + cfg.src_maxburst = pic32s->fifo_n_elm / 2; /* fill one-half */ + cfg.dst_maxburst = pic32s->fifo_n_elm / 2; /* drain one-half */ + cfg.src_addr_width = dma_width; + cfg.dst_addr_width = dma_width; + /* tx channel */ + cfg.slave_id = pic32s->tx_irq; + cfg.direction = DMA_MEM_TO_DEV; + ret = dmaengine_slave_config(master->dma_tx, &cfg); + if (ret) { + dev_err(&master->dev, "tx channel setup failed\n"); + return ret; + } + /* rx channel */ + cfg.slave_id = pic32s->rx_irq; + cfg.direction = DMA_DEV_TO_MEM; + ret = dmaengine_slave_config(master->dma_rx, &cfg); + if (ret) + dev_err(&master->dev, "rx channel setup failed\n"); + + return ret; +} + +static int pic32_spi_set_word_size(struct pic32_spi *pic32s, u8 bits_per_word) +{ + enum dma_slave_buswidth dmawidth; + u32 buswidth, v; + + switch (bits_per_word) { + case 8: + pic32s->rx_fifo = pic32_spi_rx_byte; + pic32s->tx_fifo = pic32_spi_tx_byte; + buswidth = PIC32_BPW_8; + dmawidth = DMA_SLAVE_BUSWIDTH_1_BYTE; + break; + case 16: + pic32s->rx_fifo = pic32_spi_rx_word; + pic32s->tx_fifo = pic32_spi_tx_word; + buswidth = PIC32_BPW_16; + dmawidth = DMA_SLAVE_BUSWIDTH_2_BYTES; + break; + case 32: + pic32s->rx_fifo = pic32_spi_rx_dword; + pic32s->tx_fifo = pic32_spi_tx_dword; + buswidth = PIC32_BPW_32; + dmawidth = DMA_SLAVE_BUSWIDTH_4_BYTES; + break; + default: + /* not supported */ + return -EINVAL; + } + + /* calculate maximum number of words fifos can hold */ + pic32s->fifo_n_elm = DIV_ROUND_UP(pic32s->fifo_n_byte, + bits_per_word / 8); + /* set word size */ + v = readl(&pic32s->regs->ctrl); + v &= ~(CTRL_BPW_MASK << CTRL_BPW_SHIFT); + v |= buswidth << CTRL_BPW_SHIFT; + writel(v, &pic32s->regs->ctrl); + + /* re-configure dma width, if required */ + if (test_bit(PIC32F_DMA_PREP, &pic32s->flags)) + pic32_spi_dma_config(pic32s, dmawidth); + + return 0; +} + +static int pic32_spi_prepare_hardware(struct spi_master *master) +{ + struct pic32_spi *pic32s = spi_master_get_devdata(master); + + pic32_spi_enable(pic32s); + + return 0; +} + +static int pic32_spi_prepare_message(struct spi_master *master, + struct spi_message *msg) +{ + struct pic32_spi *pic32s = spi_master_get_devdata(master); + struct spi_device *spi = msg->spi; + u32 val; + + /* set device specific bits_per_word */ + if (pic32s->bits_per_word != spi->bits_per_word) { + pic32_spi_set_word_size(pic32s, spi->bits_per_word); + pic32s->bits_per_word = spi->bits_per_word; + } + + /* device specific speed change */ + if (pic32s->speed_hz != spi->max_speed_hz) { + pic32_spi_set_clk_rate(pic32s, spi->max_speed_hz); + pic32s->speed_hz = spi->max_speed_hz; + } + + /* device specific mode change */ + if (pic32s->mode != spi->mode) { + val = readl(&pic32s->regs->ctrl); + /* active low */ + if (spi->mode & SPI_CPOL) + val |= CTRL_CKP; + else + val &= ~CTRL_CKP; + /* tx on rising edge */ + if (spi->mode & SPI_CPHA) + val &= ~CTRL_CKE; + else + val |= CTRL_CKE; + + /* rx at end of tx */ + val |= CTRL_SMP; + writel(val, &pic32s->regs->ctrl); + pic32s->mode = spi->mode; + } + + return 0; +} + +static bool pic32_spi_can_dma(struct spi_master *master, + struct spi_device *spi, + struct spi_transfer *xfer) +{ + struct pic32_spi *pic32s = spi_master_get_devdata(master); + + /* skip using DMA on small size transfer to avoid overhead.*/ + return (xfer->len >= PIC32_DMA_LEN_MIN) && + test_bit(PIC32F_DMA_PREP, &pic32s->flags); +} + +static int pic32_spi_one_transfer(struct spi_master *master, + struct spi_device *spi, + struct spi_transfer *transfer) +{ + struct pic32_spi *pic32s; + bool dma_issued = false; + unsigned long timeout; + int ret; + + pic32s = spi_master_get_devdata(master); + + /* handle transfer specific word size change */ + if (transfer->bits_per_word && + (transfer->bits_per_word != pic32s->bits_per_word)) { + ret = pic32_spi_set_word_size(pic32s, transfer->bits_per_word); + if (ret) + return ret; + pic32s->bits_per_word = transfer->bits_per_word; + } + + /* handle transfer specific speed change */ + if (transfer->speed_hz && (transfer->speed_hz != pic32s->speed_hz)) { + pic32_spi_set_clk_rate(pic32s, transfer->speed_hz); + pic32s->speed_hz = transfer->speed_hz; + } + + reinit_completion(&pic32s->xfer_done); + + /* transact by DMA mode */ + if (transfer->rx_sg.nents && transfer->tx_sg.nents) { + ret = pic32_spi_dma_transfer(pic32s, transfer); + if (ret) { + dev_err(&spi->dev, "dma submit error\n"); + return ret; + } + + /* DMA issued */ + dma_issued = true; + } else { + /* set current transfer information */ + pic32s->tx = (const void *)transfer->tx_buf; + pic32s->rx = (const void *)transfer->rx_buf; + pic32s->tx_end = pic32s->tx + transfer->len; + pic32s->rx_end = pic32s->rx + transfer->len; + pic32s->len = transfer->len; + + /* transact by interrupt driven PIO */ + enable_irq(pic32s->fault_irq); + enable_irq(pic32s->rx_irq); + enable_irq(pic32s->tx_irq); + } + + /* wait for completion */ + timeout = wait_for_completion_timeout(&pic32s->xfer_done, 2 * HZ); + if (timeout == 0) { + dev_err(&spi->dev, "wait error/timedout\n"); + if (dma_issued) { + dmaengine_terminate_all(master->dma_rx); + dmaengine_terminate_all(master->dma_tx); + } + ret = -ETIMEDOUT; + } else { + ret = 0; + } + + return ret; +} + +static int pic32_spi_unprepare_message(struct spi_master *master, + struct spi_message *msg) +{ + /* nothing to do */ + return 0; +} + +static int pic32_spi_unprepare_hardware(struct spi_master *master) +{ + struct pic32_spi *pic32s = spi_master_get_devdata(master); + + pic32_spi_disable(pic32s); + + return 0; +} + +/* This may be called multiple times by same spi dev */ +static int pic32_spi_setup(struct spi_device *spi) +{ + if (!spi->max_speed_hz) { + dev_err(&spi->dev, "No max speed HZ parameter\n"); + return -EINVAL; + } + + /* PIC32 spi controller can drive /CS during transfer depending + * on tx fifo fill-level. /CS will stay asserted as long as TX + * fifo is non-empty, else will be deasserted indicating + * completion of the ongoing transfer. This might result into + * unreliable/erroneous SPI transactions. + * To avoid that we will always handle /CS by toggling GPIO. + */ + if (!gpio_is_valid(spi->cs_gpio)) + return -EINVAL; + + gpio_direction_output(spi->cs_gpio, !(spi->mode & SPI_CS_HIGH)); + + return 0; +} + +static void pic32_spi_cleanup(struct spi_device *spi) +{ + /* de-activate cs-gpio */ + gpio_direction_output(spi->cs_gpio, !(spi->mode & SPI_CS_HIGH)); +} + +static int pic32_spi_dma_prep(struct pic32_spi *pic32s, struct device *dev) +{ + struct spi_master *master = pic32s->master; + int ret = 0; + + master->dma_rx = dma_request_chan(dev, "spi-rx"); + if (IS_ERR(master->dma_rx)) { + if (PTR_ERR(master->dma_rx) == -EPROBE_DEFER) + ret = -EPROBE_DEFER; + else + dev_warn(dev, "RX channel not found.\n"); + + master->dma_rx = NULL; + goto out_err; + } + + master->dma_tx = dma_request_chan(dev, "spi-tx"); + if (IS_ERR(master->dma_tx)) { + if (PTR_ERR(master->dma_tx) == -EPROBE_DEFER) + ret = -EPROBE_DEFER; + else + dev_warn(dev, "TX channel not found.\n"); + + master->dma_tx = NULL; + goto out_err; + } + + if (pic32_spi_dma_config(pic32s, DMA_SLAVE_BUSWIDTH_1_BYTE)) + goto out_err; + + /* DMA chnls allocated and prepared */ + set_bit(PIC32F_DMA_PREP, &pic32s->flags); + + return 0; + +out_err: + if (master->dma_rx) { + dma_release_channel(master->dma_rx); + master->dma_rx = NULL; + } + + if (master->dma_tx) { + dma_release_channel(master->dma_tx); + master->dma_tx = NULL; + } + + return ret; +} + +static void pic32_spi_dma_unprep(struct pic32_spi *pic32s) +{ + if (!test_bit(PIC32F_DMA_PREP, &pic32s->flags)) + return; + + clear_bit(PIC32F_DMA_PREP, &pic32s->flags); + if (pic32s->master->dma_rx) + dma_release_channel(pic32s->master->dma_rx); + + if (pic32s->master->dma_tx) + dma_release_channel(pic32s->master->dma_tx); +} + +static void pic32_spi_hw_init(struct pic32_spi *pic32s) +{ + u32 ctrl; + + /* disable hardware */ + pic32_spi_disable(pic32s); + + ctrl = readl(&pic32s->regs->ctrl); + /* enable enhanced fifo of 128bit deep */ + ctrl |= CTRL_ENHBUF; + pic32s->fifo_n_byte = 16; + + /* disable framing mode */ + ctrl &= ~CTRL_FRMEN; + + /* enable master mode while disabled */ + ctrl |= CTRL_MSTEN; + + /* set tx fifo threshold interrupt */ + ctrl &= ~(0x3 << CTRL_TX_INT_SHIFT); + ctrl |= (TX_FIFO_HALF_EMPTY << CTRL_TX_INT_SHIFT); + + /* set rx fifo threshold interrupt */ + ctrl &= ~(0x3 << CTRL_RX_INT_SHIFT); + ctrl |= (RX_FIFO_NOT_EMPTY << CTRL_RX_INT_SHIFT); + + /* select clk source */ + ctrl &= ~CTRL_MCLKSEL; + + /* set manual /CS mode */ + ctrl &= ~CTRL_MSSEN; + + writel(ctrl, &pic32s->regs->ctrl); + + /* enable error reporting */ + ctrl = CTRL2_TX_UR_EN | CTRL2_RX_OV_EN | CTRL2_FRM_ERR_EN; + writel(ctrl, &pic32s->regs->ctrl2_set); +} + +static int pic32_spi_hw_probe(struct platform_device *pdev, + struct pic32_spi *pic32s) +{ + struct resource *mem; + int ret; + + mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); + pic32s->regs = devm_ioremap_resource(&pdev->dev, mem); + if (IS_ERR(pic32s->regs)) + return PTR_ERR(pic32s->regs); + + pic32s->dma_base = mem->start; + + /* get irq resources: err-irq, rx-irq, tx-irq */ + pic32s->fault_irq = platform_get_irq_byname(pdev, "fault"); + if (pic32s->fault_irq < 0) + return pic32s->fault_irq; + + pic32s->rx_irq = platform_get_irq_byname(pdev, "rx"); + if (pic32s->rx_irq < 0) + return pic32s->rx_irq; + + pic32s->tx_irq = platform_get_irq_byname(pdev, "tx"); + if (pic32s->tx_irq < 0) + return pic32s->tx_irq; + + /* get clock */ + pic32s->clk = devm_clk_get(&pdev->dev, "mck0"); + if (IS_ERR(pic32s->clk)) { + dev_err(&pdev->dev, "clk not found\n"); + ret = PTR_ERR(pic32s->clk); + goto err_unmap_mem; + } + + ret = clk_prepare_enable(pic32s->clk); + if (ret) + goto err_unmap_mem; + + pic32_spi_hw_init(pic32s); + + return 0; + +err_unmap_mem: + dev_err(&pdev->dev, "%s failed, err %d\n", __func__, ret); + return ret; +} + +static int pic32_spi_probe(struct platform_device *pdev) +{ + struct spi_master *master; + struct pic32_spi *pic32s; + int ret; + + master = spi_alloc_master(&pdev->dev, sizeof(*pic32s)); + if (!master) + return -ENOMEM; + + pic32s = spi_master_get_devdata(master); + pic32s->master = master; + + ret = pic32_spi_hw_probe(pdev, pic32s); + if (ret) + goto err_master; + + master->dev.of_node = pdev->dev.of_node; + master->mode_bits = SPI_MODE_3 | SPI_MODE_0 | SPI_CS_HIGH; + master->num_chipselect = 1; /* single chip-select */ + master->max_speed_hz = clk_get_rate(pic32s->clk); + master->setup = pic32_spi_setup; + master->cleanup = pic32_spi_cleanup; + master->flags = SPI_MASTER_MUST_TX | SPI_MASTER_MUST_RX; + master->bits_per_word_mask = SPI_BPW_MASK(8) | SPI_BPW_MASK(16) | + SPI_BPW_MASK(32); + master->transfer_one = pic32_spi_one_transfer; + master->prepare_message = pic32_spi_prepare_message; + master->unprepare_message = pic32_spi_unprepare_message; + master->prepare_transfer_hardware = pic32_spi_prepare_hardware; + master->unprepare_transfer_hardware = pic32_spi_unprepare_hardware; + + /* optional DMA support */ + ret = pic32_spi_dma_prep(pic32s, &pdev->dev); + if (ret) + goto err_bailout; + + if (test_bit(PIC32F_DMA_PREP, &pic32s->flags)) + master->can_dma = pic32_spi_can_dma; + + init_completion(&pic32s->xfer_done); + pic32s->mode = -1; + + /* install irq handlers (with irq-disabled) */ + irq_set_status_flags(pic32s->fault_irq, IRQ_NOAUTOEN); + ret = devm_request_irq(&pdev->dev, pic32s->fault_irq, + pic32_spi_fault_irq, IRQF_NO_THREAD, + dev_name(&pdev->dev), pic32s); + if (ret < 0) { + dev_err(&pdev->dev, "request fault-irq %d\n", pic32s->rx_irq); + goto err_bailout; + } + + /* receive interrupt handler */ + irq_set_status_flags(pic32s->rx_irq, IRQ_NOAUTOEN); + ret = devm_request_irq(&pdev->dev, pic32s->rx_irq, + pic32_spi_rx_irq, IRQF_NO_THREAD, + dev_name(&pdev->dev), pic32s); + if (ret < 0) { + dev_err(&pdev->dev, "request rx-irq %d\n", pic32s->rx_irq); + goto err_bailout; + } + + /* transmit interrupt handler */ + irq_set_status_flags(pic32s->tx_irq, IRQ_NOAUTOEN); + ret = devm_request_irq(&pdev->dev, pic32s->tx_irq, + pic32_spi_tx_irq, IRQF_NO_THREAD, + dev_name(&pdev->dev), pic32s); + if (ret < 0) { + dev_err(&pdev->dev, "request tx-irq %d\n", pic32s->tx_irq); + goto err_bailout; + } + + /* register master */ + ret = devm_spi_register_master(&pdev->dev, master); + if (ret) { + dev_err(&master->dev, "failed registering spi master\n"); + goto err_bailout; + } + + platform_set_drvdata(pdev, pic32s); + + return 0; + +err_bailout: + pic32_spi_dma_unprep(pic32s); + clk_disable_unprepare(pic32s->clk); +err_master: + spi_master_put(master); + return ret; +} + +static int pic32_spi_remove(struct platform_device *pdev) +{ + struct pic32_spi *pic32s; + + pic32s = platform_get_drvdata(pdev); + pic32_spi_disable(pic32s); + clk_disable_unprepare(pic32s->clk); + pic32_spi_dma_unprep(pic32s); + + return 0; +} + +static const struct of_device_id pic32_spi_of_match[] = { + {.compatible = "microchip,pic32mzda-spi",}, + {}, +}; +MODULE_DEVICE_TABLE(of, pic32_spi_of_match); + +static struct platform_driver pic32_spi_driver = { + .driver = { + .name = "spi-pic32", + .of_match_table = of_match_ptr(pic32_spi_of_match), + }, + .probe = pic32_spi_probe, + .remove = pic32_spi_remove, +}; + +module_platform_driver(pic32_spi_driver); + +MODULE_AUTHOR("Purna Chandra Mandal <purna.mandal@microchip.com>"); +MODULE_DESCRIPTION("Microchip SPI driver for PIC32 SPI controller."); +MODULE_LICENSE("GPL v2"); diff --git a/drivers/spi/spi-pl022.c b/drivers/spi/spi-pl022.c new file mode 100644 index 000000000..f7603c209 --- /dev/null +++ b/drivers/spi/spi-pl022.c @@ -0,0 +1,2517 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * A driver for the ARM PL022 PrimeCell SSP/SPI bus master. + * + * Copyright (C) 2008-2012 ST-Ericsson AB + * Copyright (C) 2006 STMicroelectronics Pvt. Ltd. + * + * Author: Linus Walleij <linus.walleij@stericsson.com> + * + * Initial version inspired by: + * linux-2.6.17-rc3-mm1/drivers/spi/pxa2xx_spi.c + * Initial adoption to PL022 by: + * Sachin Verma <sachin.verma@st.com> + */ + +#include <linux/init.h> +#include <linux/module.h> +#include <linux/device.h> +#include <linux/ioport.h> +#include <linux/errno.h> +#include <linux/interrupt.h> +#include <linux/spi/spi.h> +#include <linux/delay.h> +#include <linux/clk.h> +#include <linux/err.h> +#include <linux/amba/bus.h> +#include <linux/amba/pl022.h> +#include <linux/io.h> +#include <linux/slab.h> +#include <linux/dmaengine.h> +#include <linux/dma-mapping.h> +#include <linux/scatterlist.h> +#include <linux/pm_runtime.h> +#include <linux/gpio.h> +#include <linux/of_gpio.h> +#include <linux/pinctrl/consumer.h> + +/* + * This macro is used to define some register default values. + * reg is masked with mask, the OR:ed with an (again masked) + * val shifted sb steps to the left. + */ +#define SSP_WRITE_BITS(reg, val, mask, sb) \ + ((reg) = (((reg) & ~(mask)) | (((val)<<(sb)) & (mask)))) + +/* + * This macro is also used to define some default values. + * It will just shift val by sb steps to the left and mask + * the result with mask. + */ +#define GEN_MASK_BITS(val, mask, sb) \ + (((val)<<(sb)) & (mask)) + +#define DRIVE_TX 0 +#define DO_NOT_DRIVE_TX 1 + +#define DO_NOT_QUEUE_DMA 0 +#define QUEUE_DMA 1 + +#define RX_TRANSFER 1 +#define TX_TRANSFER 2 + +/* + * Macros to access SSP Registers with their offsets + */ +#define SSP_CR0(r) (r + 0x000) +#define SSP_CR1(r) (r + 0x004) +#define SSP_DR(r) (r + 0x008) +#define SSP_SR(r) (r + 0x00C) +#define SSP_CPSR(r) (r + 0x010) +#define SSP_IMSC(r) (r + 0x014) +#define SSP_RIS(r) (r + 0x018) +#define SSP_MIS(r) (r + 0x01C) +#define SSP_ICR(r) (r + 0x020) +#define SSP_DMACR(r) (r + 0x024) +#define SSP_CSR(r) (r + 0x030) /* vendor extension */ +#define SSP_ITCR(r) (r + 0x080) +#define SSP_ITIP(r) (r + 0x084) +#define SSP_ITOP(r) (r + 0x088) +#define SSP_TDR(r) (r + 0x08C) + +#define SSP_PID0(r) (r + 0xFE0) +#define SSP_PID1(r) (r + 0xFE4) +#define SSP_PID2(r) (r + 0xFE8) +#define SSP_PID3(r) (r + 0xFEC) + +#define SSP_CID0(r) (r + 0xFF0) +#define SSP_CID1(r) (r + 0xFF4) +#define SSP_CID2(r) (r + 0xFF8) +#define SSP_CID3(r) (r + 0xFFC) + +/* + * SSP Control Register 0 - SSP_CR0 + */ +#define SSP_CR0_MASK_DSS (0x0FUL << 0) +#define SSP_CR0_MASK_FRF (0x3UL << 4) +#define SSP_CR0_MASK_SPO (0x1UL << 6) +#define SSP_CR0_MASK_SPH (0x1UL << 7) +#define SSP_CR0_MASK_SCR (0xFFUL << 8) + +/* + * The ST version of this block moves som bits + * in SSP_CR0 and extends it to 32 bits + */ +#define SSP_CR0_MASK_DSS_ST (0x1FUL << 0) +#define SSP_CR0_MASK_HALFDUP_ST (0x1UL << 5) +#define SSP_CR0_MASK_CSS_ST (0x1FUL << 16) +#define SSP_CR0_MASK_FRF_ST (0x3UL << 21) + +/* + * SSP Control Register 0 - SSP_CR1 + */ +#define SSP_CR1_MASK_LBM (0x1UL << 0) +#define SSP_CR1_MASK_SSE (0x1UL << 1) +#define SSP_CR1_MASK_MS (0x1UL << 2) +#define SSP_CR1_MASK_SOD (0x1UL << 3) + +/* + * The ST version of this block adds some bits + * in SSP_CR1 + */ +#define SSP_CR1_MASK_RENDN_ST (0x1UL << 4) +#define SSP_CR1_MASK_TENDN_ST (0x1UL << 5) +#define SSP_CR1_MASK_MWAIT_ST (0x1UL << 6) +#define SSP_CR1_MASK_RXIFLSEL_ST (0x7UL << 7) +#define SSP_CR1_MASK_TXIFLSEL_ST (0x7UL << 10) +/* This one is only in the PL023 variant */ +#define SSP_CR1_MASK_FBCLKDEL_ST (0x7UL << 13) + +/* + * SSP Status Register - SSP_SR + */ +#define SSP_SR_MASK_TFE (0x1UL << 0) /* Transmit FIFO empty */ +#define SSP_SR_MASK_TNF (0x1UL << 1) /* Transmit FIFO not full */ +#define SSP_SR_MASK_RNE (0x1UL << 2) /* Receive FIFO not empty */ +#define SSP_SR_MASK_RFF (0x1UL << 3) /* Receive FIFO full */ +#define SSP_SR_MASK_BSY (0x1UL << 4) /* Busy Flag */ + +/* + * SSP Clock Prescale Register - SSP_CPSR + */ +#define SSP_CPSR_MASK_CPSDVSR (0xFFUL << 0) + +/* + * SSP Interrupt Mask Set/Clear Register - SSP_IMSC + */ +#define SSP_IMSC_MASK_RORIM (0x1UL << 0) /* Receive Overrun Interrupt mask */ +#define SSP_IMSC_MASK_RTIM (0x1UL << 1) /* Receive timeout Interrupt mask */ +#define SSP_IMSC_MASK_RXIM (0x1UL << 2) /* Receive FIFO Interrupt mask */ +#define SSP_IMSC_MASK_TXIM (0x1UL << 3) /* Transmit FIFO Interrupt mask */ + +/* + * SSP Raw Interrupt Status Register - SSP_RIS + */ +/* Receive Overrun Raw Interrupt status */ +#define SSP_RIS_MASK_RORRIS (0x1UL << 0) +/* Receive Timeout Raw Interrupt status */ +#define SSP_RIS_MASK_RTRIS (0x1UL << 1) +/* Receive FIFO Raw Interrupt status */ +#define SSP_RIS_MASK_RXRIS (0x1UL << 2) +/* Transmit FIFO Raw Interrupt status */ +#define SSP_RIS_MASK_TXRIS (0x1UL << 3) + +/* + * SSP Masked Interrupt Status Register - SSP_MIS + */ +/* Receive Overrun Masked Interrupt status */ +#define SSP_MIS_MASK_RORMIS (0x1UL << 0) +/* Receive Timeout Masked Interrupt status */ +#define SSP_MIS_MASK_RTMIS (0x1UL << 1) +/* Receive FIFO Masked Interrupt status */ +#define SSP_MIS_MASK_RXMIS (0x1UL << 2) +/* Transmit FIFO Masked Interrupt status */ +#define SSP_MIS_MASK_TXMIS (0x1UL << 3) + +/* + * SSP Interrupt Clear Register - SSP_ICR + */ +/* Receive Overrun Raw Clear Interrupt bit */ +#define SSP_ICR_MASK_RORIC (0x1UL << 0) +/* Receive Timeout Clear Interrupt bit */ +#define SSP_ICR_MASK_RTIC (0x1UL << 1) + +/* + * SSP DMA Control Register - SSP_DMACR + */ +/* Receive DMA Enable bit */ +#define SSP_DMACR_MASK_RXDMAE (0x1UL << 0) +/* Transmit DMA Enable bit */ +#define SSP_DMACR_MASK_TXDMAE (0x1UL << 1) + +/* + * SSP Chip Select Control Register - SSP_CSR + * (vendor extension) + */ +#define SSP_CSR_CSVALUE_MASK (0x1FUL << 0) + +/* + * SSP Integration Test control Register - SSP_ITCR + */ +#define SSP_ITCR_MASK_ITEN (0x1UL << 0) +#define SSP_ITCR_MASK_TESTFIFO (0x1UL << 1) + +/* + * SSP Integration Test Input Register - SSP_ITIP + */ +#define ITIP_MASK_SSPRXD (0x1UL << 0) +#define ITIP_MASK_SSPFSSIN (0x1UL << 1) +#define ITIP_MASK_SSPCLKIN (0x1UL << 2) +#define ITIP_MASK_RXDMAC (0x1UL << 3) +#define ITIP_MASK_TXDMAC (0x1UL << 4) +#define ITIP_MASK_SSPTXDIN (0x1UL << 5) + +/* + * SSP Integration Test output Register - SSP_ITOP + */ +#define ITOP_MASK_SSPTXD (0x1UL << 0) +#define ITOP_MASK_SSPFSSOUT (0x1UL << 1) +#define ITOP_MASK_SSPCLKOUT (0x1UL << 2) +#define ITOP_MASK_SSPOEn (0x1UL << 3) +#define ITOP_MASK_SSPCTLOEn (0x1UL << 4) +#define ITOP_MASK_RORINTR (0x1UL << 5) +#define ITOP_MASK_RTINTR (0x1UL << 6) +#define ITOP_MASK_RXINTR (0x1UL << 7) +#define ITOP_MASK_TXINTR (0x1UL << 8) +#define ITOP_MASK_INTR (0x1UL << 9) +#define ITOP_MASK_RXDMABREQ (0x1UL << 10) +#define ITOP_MASK_RXDMASREQ (0x1UL << 11) +#define ITOP_MASK_TXDMABREQ (0x1UL << 12) +#define ITOP_MASK_TXDMASREQ (0x1UL << 13) + +/* + * SSP Test Data Register - SSP_TDR + */ +#define TDR_MASK_TESTDATA (0xFFFFFFFF) + +/* + * Message State + * we use the spi_message.state (void *) pointer to + * hold a single state value, that's why all this + * (void *) casting is done here. + */ +#define STATE_START ((void *) 0) +#define STATE_RUNNING ((void *) 1) +#define STATE_DONE ((void *) 2) +#define STATE_ERROR ((void *) -1) +#define STATE_TIMEOUT ((void *) -2) + +/* + * SSP State - Whether Enabled or Disabled + */ +#define SSP_DISABLED (0) +#define SSP_ENABLED (1) + +/* + * SSP DMA State - Whether DMA Enabled or Disabled + */ +#define SSP_DMA_DISABLED (0) +#define SSP_DMA_ENABLED (1) + +/* + * SSP Clock Defaults + */ +#define SSP_DEFAULT_CLKRATE 0x2 +#define SSP_DEFAULT_PRESCALE 0x40 + +/* + * SSP Clock Parameter ranges + */ +#define CPSDVR_MIN 0x02 +#define CPSDVR_MAX 0xFE +#define SCR_MIN 0x00 +#define SCR_MAX 0xFF + +/* + * SSP Interrupt related Macros + */ +#define DEFAULT_SSP_REG_IMSC 0x0UL +#define DISABLE_ALL_INTERRUPTS DEFAULT_SSP_REG_IMSC +#define ENABLE_ALL_INTERRUPTS ( \ + SSP_IMSC_MASK_RORIM | \ + SSP_IMSC_MASK_RTIM | \ + SSP_IMSC_MASK_RXIM | \ + SSP_IMSC_MASK_TXIM \ +) + +#define CLEAR_ALL_INTERRUPTS 0x3 + +#define SPI_POLLING_TIMEOUT 1000 + +/* + * The type of reading going on on this chip + */ +enum ssp_reading { + READING_NULL, + READING_U8, + READING_U16, + READING_U32 +}; + +/* + * The type of writing going on on this chip + */ +enum ssp_writing { + WRITING_NULL, + WRITING_U8, + WRITING_U16, + WRITING_U32 +}; + +/** + * struct vendor_data - vendor-specific config parameters + * for PL022 derivates + * @fifodepth: depth of FIFOs (both) + * @max_bpw: maximum number of bits per word + * @unidir: supports unidirection transfers + * @extended_cr: 32 bit wide control register 0 with extra + * features and extra features in CR1 as found in the ST variants + * @pl023: supports a subset of the ST extensions called "PL023" + * @loopback: supports loopback mode + * @internal_cs_ctrl: supports chip select control register + */ +struct vendor_data { + int fifodepth; + int max_bpw; + bool unidir; + bool extended_cr; + bool pl023; + bool loopback; + bool internal_cs_ctrl; +}; + +/** + * struct pl022 - This is the private SSP driver data structure + * @adev: AMBA device model hookup + * @vendor: vendor data for the IP block + * @phybase: the physical memory where the SSP device resides + * @virtbase: the virtual memory where the SSP is mapped + * @clk: outgoing clock "SPICLK" for the SPI bus + * @master: SPI framework hookup + * @master_info: controller-specific data from machine setup + * @pump_transfers: Tasklet used in Interrupt Transfer mode + * @cur_msg: Pointer to current spi_message being processed + * @cur_transfer: Pointer to current spi_transfer + * @cur_chip: pointer to current clients chip(assigned from controller_state) + * @next_msg_cs_active: the next message in the queue has been examined + * and it was found that it uses the same chip select as the previous + * message, so we left it active after the previous transfer, and it's + * active already. + * @tx: current position in TX buffer to be read + * @tx_end: end position in TX buffer to be read + * @rx: current position in RX buffer to be written + * @rx_end: end position in RX buffer to be written + * @read: the type of read currently going on + * @write: the type of write currently going on + * @exp_fifo_level: expected FIFO level + * @rx_lev_trig: receive FIFO watermark level which triggers IRQ + * @tx_lev_trig: transmit FIFO watermark level which triggers IRQ + * @dma_rx_channel: optional channel for RX DMA + * @dma_tx_channel: optional channel for TX DMA + * @sgt_rx: scattertable for the RX transfer + * @sgt_tx: scattertable for the TX transfer + * @dummypage: a dummy page used for driving data on the bus with DMA + * @dma_running: indicates whether DMA is in operation + * @cur_cs: current chip select (gpio) + * @chipselects: list of chipselects (gpios) + */ +struct pl022 { + struct amba_device *adev; + struct vendor_data *vendor; + resource_size_t phybase; + void __iomem *virtbase; + struct clk *clk; + struct spi_master *master; + struct pl022_ssp_controller *master_info; + /* Message per-transfer pump */ + struct tasklet_struct pump_transfers; + struct spi_message *cur_msg; + struct spi_transfer *cur_transfer; + struct chip_data *cur_chip; + bool next_msg_cs_active; + void *tx; + void *tx_end; + void *rx; + void *rx_end; + enum ssp_reading read; + enum ssp_writing write; + u32 exp_fifo_level; + enum ssp_rx_level_trig rx_lev_trig; + enum ssp_tx_level_trig tx_lev_trig; + /* DMA settings */ +#ifdef CONFIG_DMA_ENGINE + struct dma_chan *dma_rx_channel; + struct dma_chan *dma_tx_channel; + struct sg_table sgt_rx; + struct sg_table sgt_tx; + char *dummypage; + bool dma_running; +#endif + int cur_cs; + int *chipselects; +}; + +/** + * struct chip_data - To maintain runtime state of SSP for each client chip + * @cr0: Value of control register CR0 of SSP - on later ST variants this + * register is 32 bits wide rather than just 16 + * @cr1: Value of control register CR1 of SSP + * @dmacr: Value of DMA control Register of SSP + * @cpsr: Value of Clock prescale register + * @n_bytes: how many bytes(power of 2) reqd for a given data width of client + * @enable_dma: Whether to enable DMA or not + * @read: function ptr to be used to read when doing xfer for this chip + * @write: function ptr to be used to write when doing xfer for this chip + * @cs_control: chip select callback provided by chip + * @xfer_type: polling/interrupt/DMA + * + * Runtime state of the SSP controller, maintained per chip, + * This would be set according to the current message that would be served + */ +struct chip_data { + u32 cr0; + u16 cr1; + u16 dmacr; + u16 cpsr; + u8 n_bytes; + bool enable_dma; + enum ssp_reading read; + enum ssp_writing write; + void (*cs_control) (u32 command); + int xfer_type; +}; + +/** + * null_cs_control - Dummy chip select function + * @command: select/delect the chip + * + * If no chip select function is provided by client this is used as dummy + * chip select + */ +static void null_cs_control(u32 command) +{ + pr_debug("pl022: dummy chip select control, CS=0x%x\n", command); +} + +/** + * internal_cs_control - Control chip select signals via SSP_CSR. + * @pl022: SSP driver private data structure + * @command: select/delect the chip + * + * Used on controller with internal chip select control via SSP_CSR register + * (vendor extension). Each of the 5 LSB in the register controls one chip + * select signal. + */ +static void internal_cs_control(struct pl022 *pl022, u32 command) +{ + u32 tmp; + + tmp = readw(SSP_CSR(pl022->virtbase)); + if (command == SSP_CHIP_SELECT) + tmp &= ~BIT(pl022->cur_cs); + else + tmp |= BIT(pl022->cur_cs); + writew(tmp, SSP_CSR(pl022->virtbase)); +} + +static void pl022_cs_control(struct pl022 *pl022, u32 command) +{ + if (pl022->vendor->internal_cs_ctrl) + internal_cs_control(pl022, command); + else if (gpio_is_valid(pl022->cur_cs)) + gpio_set_value(pl022->cur_cs, command); + else + pl022->cur_chip->cs_control(command); +} + +/** + * giveback - current spi_message is over, schedule next message and call + * callback of this message. Assumes that caller already + * set message->status; dma and pio irqs are blocked + * @pl022: SSP driver private data structure + */ +static void giveback(struct pl022 *pl022) +{ + struct spi_transfer *last_transfer; + pl022->next_msg_cs_active = false; + + last_transfer = list_last_entry(&pl022->cur_msg->transfers, + struct spi_transfer, transfer_list); + + /* Delay if requested before any change in chip select */ + /* + * FIXME: This runs in interrupt context. + * Is this really smart? + */ + spi_transfer_delay_exec(last_transfer); + + if (!last_transfer->cs_change) { + struct spi_message *next_msg; + + /* + * cs_change was not set. We can keep the chip select + * enabled if there is message in the queue and it is + * for the same spi device. + * + * We cannot postpone this until pump_messages, because + * after calling msg->complete (below) the driver that + * sent the current message could be unloaded, which + * could invalidate the cs_control() callback... + */ + /* get a pointer to the next message, if any */ + next_msg = spi_get_next_queued_message(pl022->master); + + /* + * see if the next and current messages point + * to the same spi device. + */ + if (next_msg && next_msg->spi != pl022->cur_msg->spi) + next_msg = NULL; + if (!next_msg || pl022->cur_msg->state == STATE_ERROR) + pl022_cs_control(pl022, SSP_CHIP_DESELECT); + else + pl022->next_msg_cs_active = true; + + } + + pl022->cur_msg = NULL; + pl022->cur_transfer = NULL; + pl022->cur_chip = NULL; + + /* disable the SPI/SSP operation */ + writew((readw(SSP_CR1(pl022->virtbase)) & + (~SSP_CR1_MASK_SSE)), SSP_CR1(pl022->virtbase)); + + spi_finalize_current_message(pl022->master); +} + +/** + * flush - flush the FIFO to reach a clean state + * @pl022: SSP driver private data structure + */ +static int flush(struct pl022 *pl022) +{ + unsigned long limit = loops_per_jiffy << 1; + + dev_dbg(&pl022->adev->dev, "flush\n"); + do { + while (readw(SSP_SR(pl022->virtbase)) & SSP_SR_MASK_RNE) + readw(SSP_DR(pl022->virtbase)); + } while ((readw(SSP_SR(pl022->virtbase)) & SSP_SR_MASK_BSY) && limit--); + + pl022->exp_fifo_level = 0; + + return limit; +} + +/** + * restore_state - Load configuration of current chip + * @pl022: SSP driver private data structure + */ +static void restore_state(struct pl022 *pl022) +{ + struct chip_data *chip = pl022->cur_chip; + + if (pl022->vendor->extended_cr) + writel(chip->cr0, SSP_CR0(pl022->virtbase)); + else + writew(chip->cr0, SSP_CR0(pl022->virtbase)); + writew(chip->cr1, SSP_CR1(pl022->virtbase)); + writew(chip->dmacr, SSP_DMACR(pl022->virtbase)); + writew(chip->cpsr, SSP_CPSR(pl022->virtbase)); + writew(DISABLE_ALL_INTERRUPTS, SSP_IMSC(pl022->virtbase)); + writew(CLEAR_ALL_INTERRUPTS, SSP_ICR(pl022->virtbase)); +} + +/* + * Default SSP Register Values + */ +#define DEFAULT_SSP_REG_CR0 ( \ + GEN_MASK_BITS(SSP_DATA_BITS_12, SSP_CR0_MASK_DSS, 0) | \ + GEN_MASK_BITS(SSP_INTERFACE_MOTOROLA_SPI, SSP_CR0_MASK_FRF, 4) | \ + GEN_MASK_BITS(SSP_CLK_POL_IDLE_LOW, SSP_CR0_MASK_SPO, 6) | \ + GEN_MASK_BITS(SSP_CLK_SECOND_EDGE, SSP_CR0_MASK_SPH, 7) | \ + GEN_MASK_BITS(SSP_DEFAULT_CLKRATE, SSP_CR0_MASK_SCR, 8) \ +) + +/* ST versions have slightly different bit layout */ +#define DEFAULT_SSP_REG_CR0_ST ( \ + GEN_MASK_BITS(SSP_DATA_BITS_12, SSP_CR0_MASK_DSS_ST, 0) | \ + GEN_MASK_BITS(SSP_MICROWIRE_CHANNEL_FULL_DUPLEX, SSP_CR0_MASK_HALFDUP_ST, 5) | \ + GEN_MASK_BITS(SSP_CLK_POL_IDLE_LOW, SSP_CR0_MASK_SPO, 6) | \ + GEN_MASK_BITS(SSP_CLK_SECOND_EDGE, SSP_CR0_MASK_SPH, 7) | \ + GEN_MASK_BITS(SSP_DEFAULT_CLKRATE, SSP_CR0_MASK_SCR, 8) | \ + GEN_MASK_BITS(SSP_BITS_8, SSP_CR0_MASK_CSS_ST, 16) | \ + GEN_MASK_BITS(SSP_INTERFACE_MOTOROLA_SPI, SSP_CR0_MASK_FRF_ST, 21) \ +) + +/* The PL023 version is slightly different again */ +#define DEFAULT_SSP_REG_CR0_ST_PL023 ( \ + GEN_MASK_BITS(SSP_DATA_BITS_12, SSP_CR0_MASK_DSS_ST, 0) | \ + GEN_MASK_BITS(SSP_CLK_POL_IDLE_LOW, SSP_CR0_MASK_SPO, 6) | \ + GEN_MASK_BITS(SSP_CLK_SECOND_EDGE, SSP_CR0_MASK_SPH, 7) | \ + GEN_MASK_BITS(SSP_DEFAULT_CLKRATE, SSP_CR0_MASK_SCR, 8) \ +) + +#define DEFAULT_SSP_REG_CR1 ( \ + GEN_MASK_BITS(LOOPBACK_DISABLED, SSP_CR1_MASK_LBM, 0) | \ + GEN_MASK_BITS(SSP_DISABLED, SSP_CR1_MASK_SSE, 1) | \ + GEN_MASK_BITS(SSP_MASTER, SSP_CR1_MASK_MS, 2) | \ + GEN_MASK_BITS(DO_NOT_DRIVE_TX, SSP_CR1_MASK_SOD, 3) \ +) + +/* ST versions extend this register to use all 16 bits */ +#define DEFAULT_SSP_REG_CR1_ST ( \ + DEFAULT_SSP_REG_CR1 | \ + GEN_MASK_BITS(SSP_RX_MSB, SSP_CR1_MASK_RENDN_ST, 4) | \ + GEN_MASK_BITS(SSP_TX_MSB, SSP_CR1_MASK_TENDN_ST, 5) | \ + GEN_MASK_BITS(SSP_MWIRE_WAIT_ZERO, SSP_CR1_MASK_MWAIT_ST, 6) |\ + GEN_MASK_BITS(SSP_RX_1_OR_MORE_ELEM, SSP_CR1_MASK_RXIFLSEL_ST, 7) | \ + GEN_MASK_BITS(SSP_TX_1_OR_MORE_EMPTY_LOC, SSP_CR1_MASK_TXIFLSEL_ST, 10) \ +) + +/* + * The PL023 variant has further differences: no loopback mode, no microwire + * support, and a new clock feedback delay setting. + */ +#define DEFAULT_SSP_REG_CR1_ST_PL023 ( \ + GEN_MASK_BITS(SSP_DISABLED, SSP_CR1_MASK_SSE, 1) | \ + GEN_MASK_BITS(SSP_MASTER, SSP_CR1_MASK_MS, 2) | \ + GEN_MASK_BITS(DO_NOT_DRIVE_TX, SSP_CR1_MASK_SOD, 3) | \ + GEN_MASK_BITS(SSP_RX_MSB, SSP_CR1_MASK_RENDN_ST, 4) | \ + GEN_MASK_BITS(SSP_TX_MSB, SSP_CR1_MASK_TENDN_ST, 5) | \ + GEN_MASK_BITS(SSP_RX_1_OR_MORE_ELEM, SSP_CR1_MASK_RXIFLSEL_ST, 7) | \ + GEN_MASK_BITS(SSP_TX_1_OR_MORE_EMPTY_LOC, SSP_CR1_MASK_TXIFLSEL_ST, 10) | \ + GEN_MASK_BITS(SSP_FEEDBACK_CLK_DELAY_NONE, SSP_CR1_MASK_FBCLKDEL_ST, 13) \ +) + +#define DEFAULT_SSP_REG_CPSR ( \ + GEN_MASK_BITS(SSP_DEFAULT_PRESCALE, SSP_CPSR_MASK_CPSDVSR, 0) \ +) + +#define DEFAULT_SSP_REG_DMACR (\ + GEN_MASK_BITS(SSP_DMA_DISABLED, SSP_DMACR_MASK_RXDMAE, 0) | \ + GEN_MASK_BITS(SSP_DMA_DISABLED, SSP_DMACR_MASK_TXDMAE, 1) \ +) + +/** + * load_ssp_default_config - Load default configuration for SSP + * @pl022: SSP driver private data structure + */ +static void load_ssp_default_config(struct pl022 *pl022) +{ + if (pl022->vendor->pl023) { + writel(DEFAULT_SSP_REG_CR0_ST_PL023, SSP_CR0(pl022->virtbase)); + writew(DEFAULT_SSP_REG_CR1_ST_PL023, SSP_CR1(pl022->virtbase)); + } else if (pl022->vendor->extended_cr) { + writel(DEFAULT_SSP_REG_CR0_ST, SSP_CR0(pl022->virtbase)); + writew(DEFAULT_SSP_REG_CR1_ST, SSP_CR1(pl022->virtbase)); + } else { + writew(DEFAULT_SSP_REG_CR0, SSP_CR0(pl022->virtbase)); + writew(DEFAULT_SSP_REG_CR1, SSP_CR1(pl022->virtbase)); + } + writew(DEFAULT_SSP_REG_DMACR, SSP_DMACR(pl022->virtbase)); + writew(DEFAULT_SSP_REG_CPSR, SSP_CPSR(pl022->virtbase)); + writew(DISABLE_ALL_INTERRUPTS, SSP_IMSC(pl022->virtbase)); + writew(CLEAR_ALL_INTERRUPTS, SSP_ICR(pl022->virtbase)); +} + +/* + * This will write to TX and read from RX according to the parameters + * set in pl022. + */ +static void readwriter(struct pl022 *pl022) +{ + + /* + * The FIFO depth is different between primecell variants. + * I believe filling in too much in the FIFO might cause + * errons in 8bit wide transfers on ARM variants (just 8 words + * FIFO, means only 8x8 = 64 bits in FIFO) at least. + * + * To prevent this issue, the TX FIFO is only filled to the + * unused RX FIFO fill length, regardless of what the TX + * FIFO status flag indicates. + */ + dev_dbg(&pl022->adev->dev, + "%s, rx: %p, rxend: %p, tx: %p, txend: %p\n", + __func__, pl022->rx, pl022->rx_end, pl022->tx, pl022->tx_end); + + /* Read as much as you can */ + while ((readw(SSP_SR(pl022->virtbase)) & SSP_SR_MASK_RNE) + && (pl022->rx < pl022->rx_end)) { + switch (pl022->read) { + case READING_NULL: + readw(SSP_DR(pl022->virtbase)); + break; + case READING_U8: + *(u8 *) (pl022->rx) = + readw(SSP_DR(pl022->virtbase)) & 0xFFU; + break; + case READING_U16: + *(u16 *) (pl022->rx) = + (u16) readw(SSP_DR(pl022->virtbase)); + break; + case READING_U32: + *(u32 *) (pl022->rx) = + readl(SSP_DR(pl022->virtbase)); + break; + } + pl022->rx += (pl022->cur_chip->n_bytes); + pl022->exp_fifo_level--; + } + /* + * Write as much as possible up to the RX FIFO size + */ + while ((pl022->exp_fifo_level < pl022->vendor->fifodepth) + && (pl022->tx < pl022->tx_end)) { + switch (pl022->write) { + case WRITING_NULL: + writew(0x0, SSP_DR(pl022->virtbase)); + break; + case WRITING_U8: + writew(*(u8 *) (pl022->tx), SSP_DR(pl022->virtbase)); + break; + case WRITING_U16: + writew((*(u16 *) (pl022->tx)), SSP_DR(pl022->virtbase)); + break; + case WRITING_U32: + writel(*(u32 *) (pl022->tx), SSP_DR(pl022->virtbase)); + break; + } + pl022->tx += (pl022->cur_chip->n_bytes); + pl022->exp_fifo_level++; + /* + * This inner reader takes care of things appearing in the RX + * FIFO as we're transmitting. This will happen a lot since the + * clock starts running when you put things into the TX FIFO, + * and then things are continuously clocked into the RX FIFO. + */ + while ((readw(SSP_SR(pl022->virtbase)) & SSP_SR_MASK_RNE) + && (pl022->rx < pl022->rx_end)) { + switch (pl022->read) { + case READING_NULL: + readw(SSP_DR(pl022->virtbase)); + break; + case READING_U8: + *(u8 *) (pl022->rx) = + readw(SSP_DR(pl022->virtbase)) & 0xFFU; + break; + case READING_U16: + *(u16 *) (pl022->rx) = + (u16) readw(SSP_DR(pl022->virtbase)); + break; + case READING_U32: + *(u32 *) (pl022->rx) = + readl(SSP_DR(pl022->virtbase)); + break; + } + pl022->rx += (pl022->cur_chip->n_bytes); + pl022->exp_fifo_level--; + } + } + /* + * When we exit here the TX FIFO should be full and the RX FIFO + * should be empty + */ +} + +/** + * next_transfer - Move to the Next transfer in the current spi message + * @pl022: SSP driver private data structure + * + * This function moves though the linked list of spi transfers in the + * current spi message and returns with the state of current spi + * message i.e whether its last transfer is done(STATE_DONE) or + * Next transfer is ready(STATE_RUNNING) + */ +static void *next_transfer(struct pl022 *pl022) +{ + struct spi_message *msg = pl022->cur_msg; + struct spi_transfer *trans = pl022->cur_transfer; + + /* Move to next transfer */ + if (trans->transfer_list.next != &msg->transfers) { + pl022->cur_transfer = + list_entry(trans->transfer_list.next, + struct spi_transfer, transfer_list); + return STATE_RUNNING; + } + return STATE_DONE; +} + +/* + * This DMA functionality is only compiled in if we have + * access to the generic DMA devices/DMA engine. + */ +#ifdef CONFIG_DMA_ENGINE +static void unmap_free_dma_scatter(struct pl022 *pl022) +{ + /* Unmap and free the SG tables */ + dma_unmap_sg(pl022->dma_tx_channel->device->dev, pl022->sgt_tx.sgl, + pl022->sgt_tx.nents, DMA_TO_DEVICE); + dma_unmap_sg(pl022->dma_rx_channel->device->dev, pl022->sgt_rx.sgl, + pl022->sgt_rx.nents, DMA_FROM_DEVICE); + sg_free_table(&pl022->sgt_rx); + sg_free_table(&pl022->sgt_tx); +} + +static void dma_callback(void *data) +{ + struct pl022 *pl022 = data; + struct spi_message *msg = pl022->cur_msg; + + BUG_ON(!pl022->sgt_rx.sgl); + +#ifdef VERBOSE_DEBUG + /* + * Optionally dump out buffers to inspect contents, this is + * good if you want to convince yourself that the loopback + * read/write contents are the same, when adopting to a new + * DMA engine. + */ + { + struct scatterlist *sg; + unsigned int i; + + dma_sync_sg_for_cpu(&pl022->adev->dev, + pl022->sgt_rx.sgl, + pl022->sgt_rx.nents, + DMA_FROM_DEVICE); + + for_each_sg(pl022->sgt_rx.sgl, sg, pl022->sgt_rx.nents, i) { + dev_dbg(&pl022->adev->dev, "SPI RX SG ENTRY: %d", i); + print_hex_dump(KERN_ERR, "SPI RX: ", + DUMP_PREFIX_OFFSET, + 16, + 1, + sg_virt(sg), + sg_dma_len(sg), + 1); + } + for_each_sg(pl022->sgt_tx.sgl, sg, pl022->sgt_tx.nents, i) { + dev_dbg(&pl022->adev->dev, "SPI TX SG ENTRY: %d", i); + print_hex_dump(KERN_ERR, "SPI TX: ", + DUMP_PREFIX_OFFSET, + 16, + 1, + sg_virt(sg), + sg_dma_len(sg), + 1); + } + } +#endif + + unmap_free_dma_scatter(pl022); + + /* Update total bytes transferred */ + msg->actual_length += pl022->cur_transfer->len; + /* Move to next transfer */ + msg->state = next_transfer(pl022); + if (msg->state != STATE_DONE && pl022->cur_transfer->cs_change) + pl022_cs_control(pl022, SSP_CHIP_DESELECT); + tasklet_schedule(&pl022->pump_transfers); +} + +static void setup_dma_scatter(struct pl022 *pl022, + void *buffer, + unsigned int length, + struct sg_table *sgtab) +{ + struct scatterlist *sg; + int bytesleft = length; + void *bufp = buffer; + int mapbytes; + int i; + + if (buffer) { + for_each_sg(sgtab->sgl, sg, sgtab->nents, i) { + /* + * If there are less bytes left than what fits + * in the current page (plus page alignment offset) + * we just feed in this, else we stuff in as much + * as we can. + */ + if (bytesleft < (PAGE_SIZE - offset_in_page(bufp))) + mapbytes = bytesleft; + else + mapbytes = PAGE_SIZE - offset_in_page(bufp); + sg_set_page(sg, virt_to_page(bufp), + mapbytes, offset_in_page(bufp)); + bufp += mapbytes; + bytesleft -= mapbytes; + dev_dbg(&pl022->adev->dev, + "set RX/TX target page @ %p, %d bytes, %d left\n", + bufp, mapbytes, bytesleft); + } + } else { + /* Map the dummy buffer on every page */ + for_each_sg(sgtab->sgl, sg, sgtab->nents, i) { + if (bytesleft < PAGE_SIZE) + mapbytes = bytesleft; + else + mapbytes = PAGE_SIZE; + sg_set_page(sg, virt_to_page(pl022->dummypage), + mapbytes, 0); + bytesleft -= mapbytes; + dev_dbg(&pl022->adev->dev, + "set RX/TX to dummy page %d bytes, %d left\n", + mapbytes, bytesleft); + + } + } + BUG_ON(bytesleft); +} + +/** + * configure_dma - configures the channels for the next transfer + * @pl022: SSP driver's private data structure + */ +static int configure_dma(struct pl022 *pl022) +{ + struct dma_slave_config rx_conf = { + .src_addr = SSP_DR(pl022->phybase), + .direction = DMA_DEV_TO_MEM, + .device_fc = false, + }; + struct dma_slave_config tx_conf = { + .dst_addr = SSP_DR(pl022->phybase), + .direction = DMA_MEM_TO_DEV, + .device_fc = false, + }; + unsigned int pages; + int ret; + int rx_sglen, tx_sglen; + struct dma_chan *rxchan = pl022->dma_rx_channel; + struct dma_chan *txchan = pl022->dma_tx_channel; + struct dma_async_tx_descriptor *rxdesc; + struct dma_async_tx_descriptor *txdesc; + + /* Check that the channels are available */ + if (!rxchan || !txchan) + return -ENODEV; + + /* + * If supplied, the DMA burstsize should equal the FIFO trigger level. + * Notice that the DMA engine uses one-to-one mapping. Since we can + * not trigger on 2 elements this needs explicit mapping rather than + * calculation. + */ + switch (pl022->rx_lev_trig) { + case SSP_RX_1_OR_MORE_ELEM: + rx_conf.src_maxburst = 1; + break; + case SSP_RX_4_OR_MORE_ELEM: + rx_conf.src_maxburst = 4; + break; + case SSP_RX_8_OR_MORE_ELEM: + rx_conf.src_maxburst = 8; + break; + case SSP_RX_16_OR_MORE_ELEM: + rx_conf.src_maxburst = 16; + break; + case SSP_RX_32_OR_MORE_ELEM: + rx_conf.src_maxburst = 32; + break; + default: + rx_conf.src_maxburst = pl022->vendor->fifodepth >> 1; + break; + } + + switch (pl022->tx_lev_trig) { + case SSP_TX_1_OR_MORE_EMPTY_LOC: + tx_conf.dst_maxburst = 1; + break; + case SSP_TX_4_OR_MORE_EMPTY_LOC: + tx_conf.dst_maxburst = 4; + break; + case SSP_TX_8_OR_MORE_EMPTY_LOC: + tx_conf.dst_maxburst = 8; + break; + case SSP_TX_16_OR_MORE_EMPTY_LOC: + tx_conf.dst_maxburst = 16; + break; + case SSP_TX_32_OR_MORE_EMPTY_LOC: + tx_conf.dst_maxburst = 32; + break; + default: + tx_conf.dst_maxburst = pl022->vendor->fifodepth >> 1; + break; + } + + switch (pl022->read) { + case READING_NULL: + /* Use the same as for writing */ + rx_conf.src_addr_width = DMA_SLAVE_BUSWIDTH_UNDEFINED; + break; + case READING_U8: + rx_conf.src_addr_width = DMA_SLAVE_BUSWIDTH_1_BYTE; + break; + case READING_U16: + rx_conf.src_addr_width = DMA_SLAVE_BUSWIDTH_2_BYTES; + break; + case READING_U32: + rx_conf.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES; + break; + } + + switch (pl022->write) { + case WRITING_NULL: + /* Use the same as for reading */ + tx_conf.dst_addr_width = DMA_SLAVE_BUSWIDTH_UNDEFINED; + break; + case WRITING_U8: + tx_conf.dst_addr_width = DMA_SLAVE_BUSWIDTH_1_BYTE; + break; + case WRITING_U16: + tx_conf.dst_addr_width = DMA_SLAVE_BUSWIDTH_2_BYTES; + break; + case WRITING_U32: + tx_conf.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES; + break; + } + + /* SPI pecularity: we need to read and write the same width */ + if (rx_conf.src_addr_width == DMA_SLAVE_BUSWIDTH_UNDEFINED) + rx_conf.src_addr_width = tx_conf.dst_addr_width; + if (tx_conf.dst_addr_width == DMA_SLAVE_BUSWIDTH_UNDEFINED) + tx_conf.dst_addr_width = rx_conf.src_addr_width; + BUG_ON(rx_conf.src_addr_width != tx_conf.dst_addr_width); + + dmaengine_slave_config(rxchan, &rx_conf); + dmaengine_slave_config(txchan, &tx_conf); + + /* Create sglists for the transfers */ + pages = DIV_ROUND_UP(pl022->cur_transfer->len, PAGE_SIZE); + dev_dbg(&pl022->adev->dev, "using %d pages for transfer\n", pages); + + ret = sg_alloc_table(&pl022->sgt_rx, pages, GFP_ATOMIC); + if (ret) + goto err_alloc_rx_sg; + + ret = sg_alloc_table(&pl022->sgt_tx, pages, GFP_ATOMIC); + if (ret) + goto err_alloc_tx_sg; + + /* Fill in the scatterlists for the RX+TX buffers */ + setup_dma_scatter(pl022, pl022->rx, + pl022->cur_transfer->len, &pl022->sgt_rx); + setup_dma_scatter(pl022, pl022->tx, + pl022->cur_transfer->len, &pl022->sgt_tx); + + /* Map DMA buffers */ + rx_sglen = dma_map_sg(rxchan->device->dev, pl022->sgt_rx.sgl, + pl022->sgt_rx.nents, DMA_FROM_DEVICE); + if (!rx_sglen) + goto err_rx_sgmap; + + tx_sglen = dma_map_sg(txchan->device->dev, pl022->sgt_tx.sgl, + pl022->sgt_tx.nents, DMA_TO_DEVICE); + if (!tx_sglen) + goto err_tx_sgmap; + + /* Send both scatterlists */ + rxdesc = dmaengine_prep_slave_sg(rxchan, + pl022->sgt_rx.sgl, + rx_sglen, + DMA_DEV_TO_MEM, + DMA_PREP_INTERRUPT | DMA_CTRL_ACK); + if (!rxdesc) + goto err_rxdesc; + + txdesc = dmaengine_prep_slave_sg(txchan, + pl022->sgt_tx.sgl, + tx_sglen, + DMA_MEM_TO_DEV, + DMA_PREP_INTERRUPT | DMA_CTRL_ACK); + if (!txdesc) + goto err_txdesc; + + /* Put the callback on the RX transfer only, that should finish last */ + rxdesc->callback = dma_callback; + rxdesc->callback_param = pl022; + + /* Submit and fire RX and TX with TX last so we're ready to read! */ + dmaengine_submit(rxdesc); + dmaengine_submit(txdesc); + dma_async_issue_pending(rxchan); + dma_async_issue_pending(txchan); + pl022->dma_running = true; + + return 0; + +err_txdesc: + dmaengine_terminate_all(txchan); +err_rxdesc: + dmaengine_terminate_all(rxchan); + dma_unmap_sg(txchan->device->dev, pl022->sgt_tx.sgl, + pl022->sgt_tx.nents, DMA_TO_DEVICE); +err_tx_sgmap: + dma_unmap_sg(rxchan->device->dev, pl022->sgt_rx.sgl, + pl022->sgt_rx.nents, DMA_FROM_DEVICE); +err_rx_sgmap: + sg_free_table(&pl022->sgt_tx); +err_alloc_tx_sg: + sg_free_table(&pl022->sgt_rx); +err_alloc_rx_sg: + return -ENOMEM; +} + +static int pl022_dma_probe(struct pl022 *pl022) +{ + dma_cap_mask_t mask; + + /* Try to acquire a generic DMA engine slave channel */ + dma_cap_zero(mask); + dma_cap_set(DMA_SLAVE, mask); + /* + * We need both RX and TX channels to do DMA, else do none + * of them. + */ + pl022->dma_rx_channel = dma_request_channel(mask, + pl022->master_info->dma_filter, + pl022->master_info->dma_rx_param); + if (!pl022->dma_rx_channel) { + dev_dbg(&pl022->adev->dev, "no RX DMA channel!\n"); + goto err_no_rxchan; + } + + pl022->dma_tx_channel = dma_request_channel(mask, + pl022->master_info->dma_filter, + pl022->master_info->dma_tx_param); + if (!pl022->dma_tx_channel) { + dev_dbg(&pl022->adev->dev, "no TX DMA channel!\n"); + goto err_no_txchan; + } + + pl022->dummypage = kmalloc(PAGE_SIZE, GFP_KERNEL); + if (!pl022->dummypage) + goto err_no_dummypage; + + dev_info(&pl022->adev->dev, "setup for DMA on RX %s, TX %s\n", + dma_chan_name(pl022->dma_rx_channel), + dma_chan_name(pl022->dma_tx_channel)); + + return 0; + +err_no_dummypage: + dma_release_channel(pl022->dma_tx_channel); +err_no_txchan: + dma_release_channel(pl022->dma_rx_channel); + pl022->dma_rx_channel = NULL; +err_no_rxchan: + dev_err(&pl022->adev->dev, + "Failed to work in dma mode, work without dma!\n"); + return -ENODEV; +} + +static int pl022_dma_autoprobe(struct pl022 *pl022) +{ + struct device *dev = &pl022->adev->dev; + struct dma_chan *chan; + int err; + + /* automatically configure DMA channels from platform, normally using DT */ + chan = dma_request_chan(dev, "rx"); + if (IS_ERR(chan)) { + err = PTR_ERR(chan); + goto err_no_rxchan; + } + + pl022->dma_rx_channel = chan; + + chan = dma_request_chan(dev, "tx"); + if (IS_ERR(chan)) { + err = PTR_ERR(chan); + goto err_no_txchan; + } + + pl022->dma_tx_channel = chan; + + pl022->dummypage = kmalloc(PAGE_SIZE, GFP_KERNEL); + if (!pl022->dummypage) { + err = -ENOMEM; + goto err_no_dummypage; + } + + return 0; + +err_no_dummypage: + dma_release_channel(pl022->dma_tx_channel); + pl022->dma_tx_channel = NULL; +err_no_txchan: + dma_release_channel(pl022->dma_rx_channel); + pl022->dma_rx_channel = NULL; +err_no_rxchan: + return err; +} + +static void terminate_dma(struct pl022 *pl022) +{ + struct dma_chan *rxchan = pl022->dma_rx_channel; + struct dma_chan *txchan = pl022->dma_tx_channel; + + dmaengine_terminate_all(rxchan); + dmaengine_terminate_all(txchan); + unmap_free_dma_scatter(pl022); + pl022->dma_running = false; +} + +static void pl022_dma_remove(struct pl022 *pl022) +{ + if (pl022->dma_running) + terminate_dma(pl022); + if (pl022->dma_tx_channel) + dma_release_channel(pl022->dma_tx_channel); + if (pl022->dma_rx_channel) + dma_release_channel(pl022->dma_rx_channel); + kfree(pl022->dummypage); +} + +#else +static inline int configure_dma(struct pl022 *pl022) +{ + return -ENODEV; +} + +static inline int pl022_dma_autoprobe(struct pl022 *pl022) +{ + return 0; +} + +static inline int pl022_dma_probe(struct pl022 *pl022) +{ + return 0; +} + +static inline void pl022_dma_remove(struct pl022 *pl022) +{ +} +#endif + +/** + * pl022_interrupt_handler - Interrupt handler for SSP controller + * @irq: IRQ number + * @dev_id: Local device data + * + * This function handles interrupts generated for an interrupt based transfer. + * If a receive overrun (ROR) interrupt is there then we disable SSP, flag the + * current message's state as STATE_ERROR and schedule the tasklet + * pump_transfers which will do the postprocessing of the current message by + * calling giveback(). Otherwise it reads data from RX FIFO till there is no + * more data, and writes data in TX FIFO till it is not full. If we complete + * the transfer we move to the next transfer and schedule the tasklet. + */ +static irqreturn_t pl022_interrupt_handler(int irq, void *dev_id) +{ + struct pl022 *pl022 = dev_id; + struct spi_message *msg = pl022->cur_msg; + u16 irq_status = 0; + + if (unlikely(!msg)) { + dev_err(&pl022->adev->dev, + "bad message state in interrupt handler"); + /* Never fail */ + return IRQ_HANDLED; + } + + /* Read the Interrupt Status Register */ + irq_status = readw(SSP_MIS(pl022->virtbase)); + + if (unlikely(!irq_status)) + return IRQ_NONE; + + /* + * This handles the FIFO interrupts, the timeout + * interrupts are flatly ignored, they cannot be + * trusted. + */ + if (unlikely(irq_status & SSP_MIS_MASK_RORMIS)) { + /* + * Overrun interrupt - bail out since our Data has been + * corrupted + */ + dev_err(&pl022->adev->dev, "FIFO overrun\n"); + if (readw(SSP_SR(pl022->virtbase)) & SSP_SR_MASK_RFF) + dev_err(&pl022->adev->dev, + "RXFIFO is full\n"); + + /* + * Disable and clear interrupts, disable SSP, + * mark message with bad status so it can be + * retried. + */ + writew(DISABLE_ALL_INTERRUPTS, + SSP_IMSC(pl022->virtbase)); + writew(CLEAR_ALL_INTERRUPTS, SSP_ICR(pl022->virtbase)); + writew((readw(SSP_CR1(pl022->virtbase)) & + (~SSP_CR1_MASK_SSE)), SSP_CR1(pl022->virtbase)); + msg->state = STATE_ERROR; + + /* Schedule message queue handler */ + tasklet_schedule(&pl022->pump_transfers); + return IRQ_HANDLED; + } + + readwriter(pl022); + + if (pl022->tx == pl022->tx_end) { + /* Disable Transmit interrupt, enable receive interrupt */ + writew((readw(SSP_IMSC(pl022->virtbase)) & + ~SSP_IMSC_MASK_TXIM) | SSP_IMSC_MASK_RXIM, + SSP_IMSC(pl022->virtbase)); + } + + /* + * Since all transactions must write as much as shall be read, + * we can conclude the entire transaction once RX is complete. + * At this point, all TX will always be finished. + */ + if (pl022->rx >= pl022->rx_end) { + writew(DISABLE_ALL_INTERRUPTS, + SSP_IMSC(pl022->virtbase)); + writew(CLEAR_ALL_INTERRUPTS, SSP_ICR(pl022->virtbase)); + if (unlikely(pl022->rx > pl022->rx_end)) { + dev_warn(&pl022->adev->dev, "read %u surplus " + "bytes (did you request an odd " + "number of bytes on a 16bit bus?)\n", + (u32) (pl022->rx - pl022->rx_end)); + } + /* Update total bytes transferred */ + msg->actual_length += pl022->cur_transfer->len; + /* Move to next transfer */ + msg->state = next_transfer(pl022); + if (msg->state != STATE_DONE && pl022->cur_transfer->cs_change) + pl022_cs_control(pl022, SSP_CHIP_DESELECT); + tasklet_schedule(&pl022->pump_transfers); + return IRQ_HANDLED; + } + + return IRQ_HANDLED; +} + +/* + * This sets up the pointers to memory for the next message to + * send out on the SPI bus. + */ +static int set_up_next_transfer(struct pl022 *pl022, + struct spi_transfer *transfer) +{ + int residue; + + /* Sanity check the message for this bus width */ + residue = pl022->cur_transfer->len % pl022->cur_chip->n_bytes; + if (unlikely(residue != 0)) { + dev_err(&pl022->adev->dev, + "message of %u bytes to transmit but the current " + "chip bus has a data width of %u bytes!\n", + pl022->cur_transfer->len, + pl022->cur_chip->n_bytes); + dev_err(&pl022->adev->dev, "skipping this message\n"); + return -EIO; + } + pl022->tx = (void *)transfer->tx_buf; + pl022->tx_end = pl022->tx + pl022->cur_transfer->len; + pl022->rx = (void *)transfer->rx_buf; + pl022->rx_end = pl022->rx + pl022->cur_transfer->len; + pl022->write = + pl022->tx ? pl022->cur_chip->write : WRITING_NULL; + pl022->read = pl022->rx ? pl022->cur_chip->read : READING_NULL; + return 0; +} + +/** + * pump_transfers - Tasklet function which schedules next transfer + * when running in interrupt or DMA transfer mode. + * @data: SSP driver private data structure + * + */ +static void pump_transfers(unsigned long data) +{ + struct pl022 *pl022 = (struct pl022 *) data; + struct spi_message *message = NULL; + struct spi_transfer *transfer = NULL; + struct spi_transfer *previous = NULL; + + /* Get current state information */ + message = pl022->cur_msg; + transfer = pl022->cur_transfer; + + /* Handle for abort */ + if (message->state == STATE_ERROR) { + message->status = -EIO; + giveback(pl022); + return; + } + + /* Handle end of message */ + if (message->state == STATE_DONE) { + message->status = 0; + giveback(pl022); + return; + } + + /* Delay if requested at end of transfer before CS change */ + if (message->state == STATE_RUNNING) { + previous = list_entry(transfer->transfer_list.prev, + struct spi_transfer, + transfer_list); + /* + * FIXME: This runs in interrupt context. + * Is this really smart? + */ + spi_transfer_delay_exec(previous); + + /* Reselect chip select only if cs_change was requested */ + if (previous->cs_change) + pl022_cs_control(pl022, SSP_CHIP_SELECT); + } else { + /* STATE_START */ + message->state = STATE_RUNNING; + } + + if (set_up_next_transfer(pl022, transfer)) { + message->state = STATE_ERROR; + message->status = -EIO; + giveback(pl022); + return; + } + /* Flush the FIFOs and let's go! */ + flush(pl022); + + if (pl022->cur_chip->enable_dma) { + if (configure_dma(pl022)) { + dev_dbg(&pl022->adev->dev, + "configuration of DMA failed, fall back to interrupt mode\n"); + goto err_config_dma; + } + return; + } + +err_config_dma: + /* enable all interrupts except RX */ + writew(ENABLE_ALL_INTERRUPTS & ~SSP_IMSC_MASK_RXIM, SSP_IMSC(pl022->virtbase)); +} + +static void do_interrupt_dma_transfer(struct pl022 *pl022) +{ + /* + * Default is to enable all interrupts except RX - + * this will be enabled once TX is complete + */ + u32 irqflags = (u32)(ENABLE_ALL_INTERRUPTS & ~SSP_IMSC_MASK_RXIM); + + /* Enable target chip, if not already active */ + if (!pl022->next_msg_cs_active) + pl022_cs_control(pl022, SSP_CHIP_SELECT); + + if (set_up_next_transfer(pl022, pl022->cur_transfer)) { + /* Error path */ + pl022->cur_msg->state = STATE_ERROR; + pl022->cur_msg->status = -EIO; + giveback(pl022); + return; + } + /* If we're using DMA, set up DMA here */ + if (pl022->cur_chip->enable_dma) { + /* Configure DMA transfer */ + if (configure_dma(pl022)) { + dev_dbg(&pl022->adev->dev, + "configuration of DMA failed, fall back to interrupt mode\n"); + goto err_config_dma; + } + /* Disable interrupts in DMA mode, IRQ from DMA controller */ + irqflags = DISABLE_ALL_INTERRUPTS; + } +err_config_dma: + /* Enable SSP, turn on interrupts */ + writew((readw(SSP_CR1(pl022->virtbase)) | SSP_CR1_MASK_SSE), + SSP_CR1(pl022->virtbase)); + writew(irqflags, SSP_IMSC(pl022->virtbase)); +} + +static void print_current_status(struct pl022 *pl022) +{ + u32 read_cr0; + u16 read_cr1, read_dmacr, read_sr; + + if (pl022->vendor->extended_cr) + read_cr0 = readl(SSP_CR0(pl022->virtbase)); + else + read_cr0 = readw(SSP_CR0(pl022->virtbase)); + read_cr1 = readw(SSP_CR1(pl022->virtbase)); + read_dmacr = readw(SSP_DMACR(pl022->virtbase)); + read_sr = readw(SSP_SR(pl022->virtbase)); + + dev_warn(&pl022->adev->dev, "spi-pl022 CR0: %x\n", read_cr0); + dev_warn(&pl022->adev->dev, "spi-pl022 CR1: %x\n", read_cr1); + dev_warn(&pl022->adev->dev, "spi-pl022 DMACR: %x\n", read_dmacr); + dev_warn(&pl022->adev->dev, "spi-pl022 SR: %x\n", read_sr); + dev_warn(&pl022->adev->dev, + "spi-pl022 exp_fifo_level/fifodepth: %u/%d\n", + pl022->exp_fifo_level, + pl022->vendor->fifodepth); + +} + +static void do_polling_transfer(struct pl022 *pl022) +{ + struct spi_message *message = NULL; + struct spi_transfer *transfer = NULL; + struct spi_transfer *previous = NULL; + unsigned long time, timeout; + + message = pl022->cur_msg; + + while (message->state != STATE_DONE) { + /* Handle for abort */ + if (message->state == STATE_ERROR) + break; + transfer = pl022->cur_transfer; + + /* Delay if requested at end of transfer */ + if (message->state == STATE_RUNNING) { + previous = + list_entry(transfer->transfer_list.prev, + struct spi_transfer, transfer_list); + spi_transfer_delay_exec(previous); + if (previous->cs_change) + pl022_cs_control(pl022, SSP_CHIP_SELECT); + } else { + /* STATE_START */ + message->state = STATE_RUNNING; + if (!pl022->next_msg_cs_active) + pl022_cs_control(pl022, SSP_CHIP_SELECT); + } + + /* Configuration Changing Per Transfer */ + if (set_up_next_transfer(pl022, transfer)) { + /* Error path */ + message->state = STATE_ERROR; + break; + } + /* Flush FIFOs and enable SSP */ + flush(pl022); + writew((readw(SSP_CR1(pl022->virtbase)) | SSP_CR1_MASK_SSE), + SSP_CR1(pl022->virtbase)); + + dev_dbg(&pl022->adev->dev, "polling transfer ongoing ...\n"); + + timeout = jiffies + msecs_to_jiffies(SPI_POLLING_TIMEOUT); + while (pl022->tx < pl022->tx_end || pl022->rx < pl022->rx_end) { + time = jiffies; + readwriter(pl022); + if (time_after(time, timeout)) { + dev_warn(&pl022->adev->dev, + "%s: timeout!\n", __func__); + message->state = STATE_TIMEOUT; + print_current_status(pl022); + goto out; + } + cpu_relax(); + } + + /* Update total byte transferred */ + message->actual_length += pl022->cur_transfer->len; + /* Move to next transfer */ + message->state = next_transfer(pl022); + if (message->state != STATE_DONE + && pl022->cur_transfer->cs_change) + pl022_cs_control(pl022, SSP_CHIP_DESELECT); + } +out: + /* Handle end of message */ + if (message->state == STATE_DONE) + message->status = 0; + else if (message->state == STATE_TIMEOUT) + message->status = -EAGAIN; + else + message->status = -EIO; + + giveback(pl022); + return; +} + +static int pl022_transfer_one_message(struct spi_master *master, + struct spi_message *msg) +{ + struct pl022 *pl022 = spi_master_get_devdata(master); + + /* Initial message state */ + pl022->cur_msg = msg; + msg->state = STATE_START; + + pl022->cur_transfer = list_entry(msg->transfers.next, + struct spi_transfer, transfer_list); + + /* Setup the SPI using the per chip configuration */ + pl022->cur_chip = spi_get_ctldata(msg->spi); + pl022->cur_cs = pl022->chipselects[msg->spi->chip_select]; + + restore_state(pl022); + flush(pl022); + + if (pl022->cur_chip->xfer_type == POLLING_TRANSFER) + do_polling_transfer(pl022); + else + do_interrupt_dma_transfer(pl022); + + return 0; +} + +static int pl022_unprepare_transfer_hardware(struct spi_master *master) +{ + struct pl022 *pl022 = spi_master_get_devdata(master); + + /* nothing more to do - disable spi/ssp and power off */ + writew((readw(SSP_CR1(pl022->virtbase)) & + (~SSP_CR1_MASK_SSE)), SSP_CR1(pl022->virtbase)); + + return 0; +} + +static int verify_controller_parameters(struct pl022 *pl022, + struct pl022_config_chip const *chip_info) +{ + if ((chip_info->iface < SSP_INTERFACE_MOTOROLA_SPI) + || (chip_info->iface > SSP_INTERFACE_UNIDIRECTIONAL)) { + dev_err(&pl022->adev->dev, + "interface is configured incorrectly\n"); + return -EINVAL; + } + if ((chip_info->iface == SSP_INTERFACE_UNIDIRECTIONAL) && + (!pl022->vendor->unidir)) { + dev_err(&pl022->adev->dev, + "unidirectional mode not supported in this " + "hardware version\n"); + return -EINVAL; + } + if ((chip_info->hierarchy != SSP_MASTER) + && (chip_info->hierarchy != SSP_SLAVE)) { + dev_err(&pl022->adev->dev, + "hierarchy is configured incorrectly\n"); + return -EINVAL; + } + if ((chip_info->com_mode != INTERRUPT_TRANSFER) + && (chip_info->com_mode != DMA_TRANSFER) + && (chip_info->com_mode != POLLING_TRANSFER)) { + dev_err(&pl022->adev->dev, + "Communication mode is configured incorrectly\n"); + return -EINVAL; + } + switch (chip_info->rx_lev_trig) { + case SSP_RX_1_OR_MORE_ELEM: + case SSP_RX_4_OR_MORE_ELEM: + case SSP_RX_8_OR_MORE_ELEM: + /* These are always OK, all variants can handle this */ + break; + case SSP_RX_16_OR_MORE_ELEM: + if (pl022->vendor->fifodepth < 16) { + dev_err(&pl022->adev->dev, + "RX FIFO Trigger Level is configured incorrectly\n"); + return -EINVAL; + } + break; + case SSP_RX_32_OR_MORE_ELEM: + if (pl022->vendor->fifodepth < 32) { + dev_err(&pl022->adev->dev, + "RX FIFO Trigger Level is configured incorrectly\n"); + return -EINVAL; + } + break; + default: + dev_err(&pl022->adev->dev, + "RX FIFO Trigger Level is configured incorrectly\n"); + return -EINVAL; + } + switch (chip_info->tx_lev_trig) { + case SSP_TX_1_OR_MORE_EMPTY_LOC: + case SSP_TX_4_OR_MORE_EMPTY_LOC: + case SSP_TX_8_OR_MORE_EMPTY_LOC: + /* These are always OK, all variants can handle this */ + break; + case SSP_TX_16_OR_MORE_EMPTY_LOC: + if (pl022->vendor->fifodepth < 16) { + dev_err(&pl022->adev->dev, + "TX FIFO Trigger Level is configured incorrectly\n"); + return -EINVAL; + } + break; + case SSP_TX_32_OR_MORE_EMPTY_LOC: + if (pl022->vendor->fifodepth < 32) { + dev_err(&pl022->adev->dev, + "TX FIFO Trigger Level is configured incorrectly\n"); + return -EINVAL; + } + break; + default: + dev_err(&pl022->adev->dev, + "TX FIFO Trigger Level is configured incorrectly\n"); + return -EINVAL; + } + if (chip_info->iface == SSP_INTERFACE_NATIONAL_MICROWIRE) { + if ((chip_info->ctrl_len < SSP_BITS_4) + || (chip_info->ctrl_len > SSP_BITS_32)) { + dev_err(&pl022->adev->dev, + "CTRL LEN is configured incorrectly\n"); + return -EINVAL; + } + if ((chip_info->wait_state != SSP_MWIRE_WAIT_ZERO) + && (chip_info->wait_state != SSP_MWIRE_WAIT_ONE)) { + dev_err(&pl022->adev->dev, + "Wait State is configured incorrectly\n"); + return -EINVAL; + } + /* Half duplex is only available in the ST Micro version */ + if (pl022->vendor->extended_cr) { + if ((chip_info->duplex != + SSP_MICROWIRE_CHANNEL_FULL_DUPLEX) + && (chip_info->duplex != + SSP_MICROWIRE_CHANNEL_HALF_DUPLEX)) { + dev_err(&pl022->adev->dev, + "Microwire duplex mode is configured incorrectly\n"); + return -EINVAL; + } + } else { + if (chip_info->duplex != SSP_MICROWIRE_CHANNEL_FULL_DUPLEX) { + dev_err(&pl022->adev->dev, + "Microwire half duplex mode requested," + " but this is only available in the" + " ST version of PL022\n"); + return -EINVAL; + } + } + } + return 0; +} + +static inline u32 spi_rate(u32 rate, u16 cpsdvsr, u16 scr) +{ + return rate / (cpsdvsr * (1 + scr)); +} + +static int calculate_effective_freq(struct pl022 *pl022, int freq, struct + ssp_clock_params * clk_freq) +{ + /* Lets calculate the frequency parameters */ + u16 cpsdvsr = CPSDVR_MIN, scr = SCR_MIN; + u32 rate, max_tclk, min_tclk, best_freq = 0, best_cpsdvsr = 0, + best_scr = 0, tmp, found = 0; + + rate = clk_get_rate(pl022->clk); + /* cpsdvscr = 2 & scr 0 */ + max_tclk = spi_rate(rate, CPSDVR_MIN, SCR_MIN); + /* cpsdvsr = 254 & scr = 255 */ + min_tclk = spi_rate(rate, CPSDVR_MAX, SCR_MAX); + + if (freq > max_tclk) + dev_warn(&pl022->adev->dev, + "Max speed that can be programmed is %d Hz, you requested %d\n", + max_tclk, freq); + + if (freq < min_tclk) { + dev_err(&pl022->adev->dev, + "Requested frequency: %d Hz is less than minimum possible %d Hz\n", + freq, min_tclk); + return -EINVAL; + } + + /* + * best_freq will give closest possible available rate (<= requested + * freq) for all values of scr & cpsdvsr. + */ + while ((cpsdvsr <= CPSDVR_MAX) && !found) { + while (scr <= SCR_MAX) { + tmp = spi_rate(rate, cpsdvsr, scr); + + if (tmp > freq) { + /* we need lower freq */ + scr++; + continue; + } + + /* + * If found exact value, mark found and break. + * If found more closer value, update and break. + */ + if (tmp > best_freq) { + best_freq = tmp; + best_cpsdvsr = cpsdvsr; + best_scr = scr; + + if (tmp == freq) + found = 1; + } + /* + * increased scr will give lower rates, which are not + * required + */ + break; + } + cpsdvsr += 2; + scr = SCR_MIN; + } + + WARN(!best_freq, "pl022: Matching cpsdvsr and scr not found for %d Hz rate \n", + freq); + + clk_freq->cpsdvsr = (u8) (best_cpsdvsr & 0xFF); + clk_freq->scr = (u8) (best_scr & 0xFF); + dev_dbg(&pl022->adev->dev, + "SSP Target Frequency is: %u, Effective Frequency is %u\n", + freq, best_freq); + dev_dbg(&pl022->adev->dev, "SSP cpsdvsr = %d, scr = %d\n", + clk_freq->cpsdvsr, clk_freq->scr); + + return 0; +} + +/* + * A piece of default chip info unless the platform + * supplies it. + */ +static const struct pl022_config_chip pl022_default_chip_info = { + .com_mode = POLLING_TRANSFER, + .iface = SSP_INTERFACE_MOTOROLA_SPI, + .hierarchy = SSP_SLAVE, + .slave_tx_disable = DO_NOT_DRIVE_TX, + .rx_lev_trig = SSP_RX_1_OR_MORE_ELEM, + .tx_lev_trig = SSP_TX_1_OR_MORE_EMPTY_LOC, + .ctrl_len = SSP_BITS_8, + .wait_state = SSP_MWIRE_WAIT_ZERO, + .duplex = SSP_MICROWIRE_CHANNEL_FULL_DUPLEX, + .cs_control = null_cs_control, +}; + +/** + * pl022_setup - setup function registered to SPI master framework + * @spi: spi device which is requesting setup + * + * This function is registered to the SPI framework for this SPI master + * controller. If it is the first time when setup is called by this device, + * this function will initialize the runtime state for this chip and save + * the same in the device structure. Else it will update the runtime info + * with the updated chip info. Nothing is really being written to the + * controller hardware here, that is not done until the actual transfer + * commence. + */ +static int pl022_setup(struct spi_device *spi) +{ + struct pl022_config_chip const *chip_info; + struct pl022_config_chip chip_info_dt; + struct chip_data *chip; + struct ssp_clock_params clk_freq = { .cpsdvsr = 0, .scr = 0}; + int status = 0; + struct pl022 *pl022 = spi_master_get_devdata(spi->master); + unsigned int bits = spi->bits_per_word; + u32 tmp; + struct device_node *np = spi->dev.of_node; + + if (!spi->max_speed_hz) + return -EINVAL; + + /* Get controller_state if one is supplied */ + chip = spi_get_ctldata(spi); + + if (chip == NULL) { + chip = kzalloc(sizeof(struct chip_data), GFP_KERNEL); + if (!chip) + return -ENOMEM; + dev_dbg(&spi->dev, + "allocated memory for controller's runtime state\n"); + } + + /* Get controller data if one is supplied */ + chip_info = spi->controller_data; + + if (chip_info == NULL) { + if (np) { + chip_info_dt = pl022_default_chip_info; + + chip_info_dt.hierarchy = SSP_MASTER; + of_property_read_u32(np, "pl022,interface", + &chip_info_dt.iface); + of_property_read_u32(np, "pl022,com-mode", + &chip_info_dt.com_mode); + of_property_read_u32(np, "pl022,rx-level-trig", + &chip_info_dt.rx_lev_trig); + of_property_read_u32(np, "pl022,tx-level-trig", + &chip_info_dt.tx_lev_trig); + of_property_read_u32(np, "pl022,ctrl-len", + &chip_info_dt.ctrl_len); + of_property_read_u32(np, "pl022,wait-state", + &chip_info_dt.wait_state); + of_property_read_u32(np, "pl022,duplex", + &chip_info_dt.duplex); + + chip_info = &chip_info_dt; + } else { + chip_info = &pl022_default_chip_info; + /* spi_board_info.controller_data not is supplied */ + dev_dbg(&spi->dev, + "using default controller_data settings\n"); + } + } else + dev_dbg(&spi->dev, + "using user supplied controller_data settings\n"); + + /* + * We can override with custom divisors, else we use the board + * frequency setting + */ + if ((0 == chip_info->clk_freq.cpsdvsr) + && (0 == chip_info->clk_freq.scr)) { + status = calculate_effective_freq(pl022, + spi->max_speed_hz, + &clk_freq); + if (status < 0) + goto err_config_params; + } else { + memcpy(&clk_freq, &chip_info->clk_freq, sizeof(clk_freq)); + if ((clk_freq.cpsdvsr % 2) != 0) + clk_freq.cpsdvsr = + clk_freq.cpsdvsr - 1; + } + if ((clk_freq.cpsdvsr < CPSDVR_MIN) + || (clk_freq.cpsdvsr > CPSDVR_MAX)) { + status = -EINVAL; + dev_err(&spi->dev, + "cpsdvsr is configured incorrectly\n"); + goto err_config_params; + } + + status = verify_controller_parameters(pl022, chip_info); + if (status) { + dev_err(&spi->dev, "controller data is incorrect"); + goto err_config_params; + } + + pl022->rx_lev_trig = chip_info->rx_lev_trig; + pl022->tx_lev_trig = chip_info->tx_lev_trig; + + /* Now set controller state based on controller data */ + chip->xfer_type = chip_info->com_mode; + if (!chip_info->cs_control) { + chip->cs_control = null_cs_control; + if (!gpio_is_valid(pl022->chipselects[spi->chip_select])) + dev_warn(&spi->dev, + "invalid chip select\n"); + } else + chip->cs_control = chip_info->cs_control; + + /* Check bits per word with vendor specific range */ + if ((bits <= 3) || (bits > pl022->vendor->max_bpw)) { + status = -ENOTSUPP; + dev_err(&spi->dev, "illegal data size for this controller!\n"); + dev_err(&spi->dev, "This controller can only handle 4 <= n <= %d bit words\n", + pl022->vendor->max_bpw); + goto err_config_params; + } else if (bits <= 8) { + dev_dbg(&spi->dev, "4 <= n <=8 bits per word\n"); + chip->n_bytes = 1; + chip->read = READING_U8; + chip->write = WRITING_U8; + } else if (bits <= 16) { + dev_dbg(&spi->dev, "9 <= n <= 16 bits per word\n"); + chip->n_bytes = 2; + chip->read = READING_U16; + chip->write = WRITING_U16; + } else { + dev_dbg(&spi->dev, "17 <= n <= 32 bits per word\n"); + chip->n_bytes = 4; + chip->read = READING_U32; + chip->write = WRITING_U32; + } + + /* Now Initialize all register settings required for this chip */ + chip->cr0 = 0; + chip->cr1 = 0; + chip->dmacr = 0; + chip->cpsr = 0; + if ((chip_info->com_mode == DMA_TRANSFER) + && ((pl022->master_info)->enable_dma)) { + chip->enable_dma = true; + dev_dbg(&spi->dev, "DMA mode set in controller state\n"); + SSP_WRITE_BITS(chip->dmacr, SSP_DMA_ENABLED, + SSP_DMACR_MASK_RXDMAE, 0); + SSP_WRITE_BITS(chip->dmacr, SSP_DMA_ENABLED, + SSP_DMACR_MASK_TXDMAE, 1); + } else { + chip->enable_dma = false; + dev_dbg(&spi->dev, "DMA mode NOT set in controller state\n"); + SSP_WRITE_BITS(chip->dmacr, SSP_DMA_DISABLED, + SSP_DMACR_MASK_RXDMAE, 0); + SSP_WRITE_BITS(chip->dmacr, SSP_DMA_DISABLED, + SSP_DMACR_MASK_TXDMAE, 1); + } + + chip->cpsr = clk_freq.cpsdvsr; + + /* Special setup for the ST micro extended control registers */ + if (pl022->vendor->extended_cr) { + u32 etx; + + if (pl022->vendor->pl023) { + /* These bits are only in the PL023 */ + SSP_WRITE_BITS(chip->cr1, chip_info->clkdelay, + SSP_CR1_MASK_FBCLKDEL_ST, 13); + } else { + /* These bits are in the PL022 but not PL023 */ + SSP_WRITE_BITS(chip->cr0, chip_info->duplex, + SSP_CR0_MASK_HALFDUP_ST, 5); + SSP_WRITE_BITS(chip->cr0, chip_info->ctrl_len, + SSP_CR0_MASK_CSS_ST, 16); + SSP_WRITE_BITS(chip->cr0, chip_info->iface, + SSP_CR0_MASK_FRF_ST, 21); + SSP_WRITE_BITS(chip->cr1, chip_info->wait_state, + SSP_CR1_MASK_MWAIT_ST, 6); + } + SSP_WRITE_BITS(chip->cr0, bits - 1, + SSP_CR0_MASK_DSS_ST, 0); + + if (spi->mode & SPI_LSB_FIRST) { + tmp = SSP_RX_LSB; + etx = SSP_TX_LSB; + } else { + tmp = SSP_RX_MSB; + etx = SSP_TX_MSB; + } + SSP_WRITE_BITS(chip->cr1, tmp, SSP_CR1_MASK_RENDN_ST, 4); + SSP_WRITE_BITS(chip->cr1, etx, SSP_CR1_MASK_TENDN_ST, 5); + SSP_WRITE_BITS(chip->cr1, chip_info->rx_lev_trig, + SSP_CR1_MASK_RXIFLSEL_ST, 7); + SSP_WRITE_BITS(chip->cr1, chip_info->tx_lev_trig, + SSP_CR1_MASK_TXIFLSEL_ST, 10); + } else { + SSP_WRITE_BITS(chip->cr0, bits - 1, + SSP_CR0_MASK_DSS, 0); + SSP_WRITE_BITS(chip->cr0, chip_info->iface, + SSP_CR0_MASK_FRF, 4); + } + + /* Stuff that is common for all versions */ + if (spi->mode & SPI_CPOL) + tmp = SSP_CLK_POL_IDLE_HIGH; + else + tmp = SSP_CLK_POL_IDLE_LOW; + SSP_WRITE_BITS(chip->cr0, tmp, SSP_CR0_MASK_SPO, 6); + + if (spi->mode & SPI_CPHA) + tmp = SSP_CLK_SECOND_EDGE; + else + tmp = SSP_CLK_FIRST_EDGE; + SSP_WRITE_BITS(chip->cr0, tmp, SSP_CR0_MASK_SPH, 7); + + SSP_WRITE_BITS(chip->cr0, clk_freq.scr, SSP_CR0_MASK_SCR, 8); + /* Loopback is available on all versions except PL023 */ + if (pl022->vendor->loopback) { + if (spi->mode & SPI_LOOP) + tmp = LOOPBACK_ENABLED; + else + tmp = LOOPBACK_DISABLED; + SSP_WRITE_BITS(chip->cr1, tmp, SSP_CR1_MASK_LBM, 0); + } + SSP_WRITE_BITS(chip->cr1, SSP_DISABLED, SSP_CR1_MASK_SSE, 1); + SSP_WRITE_BITS(chip->cr1, chip_info->hierarchy, SSP_CR1_MASK_MS, 2); + SSP_WRITE_BITS(chip->cr1, chip_info->slave_tx_disable, SSP_CR1_MASK_SOD, + 3); + + /* Save controller_state */ + spi_set_ctldata(spi, chip); + return status; + err_config_params: + spi_set_ctldata(spi, NULL); + kfree(chip); + return status; +} + +/** + * pl022_cleanup - cleanup function registered to SPI master framework + * @spi: spi device which is requesting cleanup + * + * This function is registered to the SPI framework for this SPI master + * controller. It will free the runtime state of chip. + */ +static void pl022_cleanup(struct spi_device *spi) +{ + struct chip_data *chip = spi_get_ctldata(spi); + + spi_set_ctldata(spi, NULL); + kfree(chip); +} + +static struct pl022_ssp_controller * +pl022_platform_data_dt_get(struct device *dev) +{ + struct device_node *np = dev->of_node; + struct pl022_ssp_controller *pd; + u32 tmp = 0; + + if (!np) { + dev_err(dev, "no dt node defined\n"); + return NULL; + } + + pd = devm_kzalloc(dev, sizeof(struct pl022_ssp_controller), GFP_KERNEL); + if (!pd) + return NULL; + + pd->bus_id = -1; + pd->enable_dma = 1; + of_property_read_u32(np, "num-cs", &tmp); + pd->num_chipselect = tmp; + of_property_read_u32(np, "pl022,autosuspend-delay", + &pd->autosuspend_delay); + pd->rt = of_property_read_bool(np, "pl022,rt"); + + return pd; +} + +static int pl022_probe(struct amba_device *adev, const struct amba_id *id) +{ + struct device *dev = &adev->dev; + struct pl022_ssp_controller *platform_info = + dev_get_platdata(&adev->dev); + struct spi_master *master; + struct pl022 *pl022 = NULL; /*Data for this driver */ + struct device_node *np = adev->dev.of_node; + int status = 0, i, num_cs; + + dev_info(&adev->dev, + "ARM PL022 driver, device ID: 0x%08x\n", adev->periphid); + if (!platform_info && IS_ENABLED(CONFIG_OF)) + platform_info = pl022_platform_data_dt_get(dev); + + if (!platform_info) { + dev_err(dev, "probe: no platform data defined\n"); + return -ENODEV; + } + + if (platform_info->num_chipselect) { + num_cs = platform_info->num_chipselect; + } else { + dev_err(dev, "probe: no chip select defined\n"); + return -ENODEV; + } + + /* Allocate master with space for data */ + master = spi_alloc_master(dev, sizeof(struct pl022)); + if (master == NULL) { + dev_err(&adev->dev, "probe - cannot alloc SPI master\n"); + return -ENOMEM; + } + + pl022 = spi_master_get_devdata(master); + pl022->master = master; + pl022->master_info = platform_info; + pl022->adev = adev; + pl022->vendor = id->data; + pl022->chipselects = devm_kcalloc(dev, num_cs, sizeof(int), + GFP_KERNEL); + if (!pl022->chipselects) { + status = -ENOMEM; + goto err_no_mem; + } + + /* + * Bus Number Which has been Assigned to this SSP controller + * on this board + */ + master->bus_num = platform_info->bus_id; + master->num_chipselect = num_cs; + master->cleanup = pl022_cleanup; + master->setup = pl022_setup; + master->auto_runtime_pm = true; + master->transfer_one_message = pl022_transfer_one_message; + master->unprepare_transfer_hardware = pl022_unprepare_transfer_hardware; + master->rt = platform_info->rt; + master->dev.of_node = dev->of_node; + + if (platform_info->num_chipselect && platform_info->chipselects) { + for (i = 0; i < num_cs; i++) + pl022->chipselects[i] = platform_info->chipselects[i]; + } else if (pl022->vendor->internal_cs_ctrl) { + for (i = 0; i < num_cs; i++) + pl022->chipselects[i] = i; + } else if (IS_ENABLED(CONFIG_OF)) { + for (i = 0; i < num_cs; i++) { + int cs_gpio = of_get_named_gpio(np, "cs-gpios", i); + + if (cs_gpio == -EPROBE_DEFER) { + status = -EPROBE_DEFER; + goto err_no_gpio; + } + + pl022->chipselects[i] = cs_gpio; + + if (gpio_is_valid(cs_gpio)) { + if (devm_gpio_request(dev, cs_gpio, "ssp-pl022")) + dev_err(&adev->dev, + "could not request %d gpio\n", + cs_gpio); + else if (gpio_direction_output(cs_gpio, 1)) + dev_err(&adev->dev, + "could not set gpio %d as output\n", + cs_gpio); + } + } + } + + /* + * Supports mode 0-3, loopback, and active low CS. Transfers are + * always MS bit first on the original pl022. + */ + master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH | SPI_LOOP; + if (pl022->vendor->extended_cr) + master->mode_bits |= SPI_LSB_FIRST; + + dev_dbg(&adev->dev, "BUSNO: %d\n", master->bus_num); + + status = amba_request_regions(adev, NULL); + if (status) + goto err_no_ioregion; + + pl022->phybase = adev->res.start; + pl022->virtbase = devm_ioremap(dev, adev->res.start, + resource_size(&adev->res)); + if (pl022->virtbase == NULL) { + status = -ENOMEM; + goto err_no_ioremap; + } + dev_info(&adev->dev, "mapped registers from %pa to %p\n", + &adev->res.start, pl022->virtbase); + + pl022->clk = devm_clk_get(&adev->dev, NULL); + if (IS_ERR(pl022->clk)) { + status = PTR_ERR(pl022->clk); + dev_err(&adev->dev, "could not retrieve SSP/SPI bus clock\n"); + goto err_no_clk; + } + + status = clk_prepare_enable(pl022->clk); + if (status) { + dev_err(&adev->dev, "could not enable SSP/SPI bus clock\n"); + goto err_no_clk_en; + } + + /* Initialize transfer pump */ + tasklet_init(&pl022->pump_transfers, pump_transfers, + (unsigned long)pl022); + + /* Disable SSP */ + writew((readw(SSP_CR1(pl022->virtbase)) & (~SSP_CR1_MASK_SSE)), + SSP_CR1(pl022->virtbase)); + load_ssp_default_config(pl022); + + status = devm_request_irq(dev, adev->irq[0], pl022_interrupt_handler, + 0, "pl022", pl022); + if (status < 0) { + dev_err(&adev->dev, "probe - cannot get IRQ (%d)\n", status); + goto err_no_irq; + } + + /* Get DMA channels, try autoconfiguration first */ + status = pl022_dma_autoprobe(pl022); + if (status == -EPROBE_DEFER) { + dev_dbg(dev, "deferring probe to get DMA channel\n"); + goto err_no_irq; + } + + /* If that failed, use channels from platform_info */ + if (status == 0) + platform_info->enable_dma = 1; + else if (platform_info->enable_dma) { + status = pl022_dma_probe(pl022); + if (status != 0) + platform_info->enable_dma = 0; + } + + /* Register with the SPI framework */ + amba_set_drvdata(adev, pl022); + status = devm_spi_register_master(&adev->dev, master); + if (status != 0) { + dev_err(&adev->dev, + "probe - problem registering spi master\n"); + goto err_spi_register; + } + dev_dbg(dev, "probe succeeded\n"); + + /* let runtime pm put suspend */ + if (platform_info->autosuspend_delay > 0) { + dev_info(&adev->dev, + "will use autosuspend for runtime pm, delay %dms\n", + platform_info->autosuspend_delay); + pm_runtime_set_autosuspend_delay(dev, + platform_info->autosuspend_delay); + pm_runtime_use_autosuspend(dev); + } + pm_runtime_put(dev); + + return 0; + + err_spi_register: + if (platform_info->enable_dma) + pl022_dma_remove(pl022); + err_no_irq: + clk_disable_unprepare(pl022->clk); + err_no_clk_en: + err_no_clk: + err_no_ioremap: + amba_release_regions(adev); + err_no_ioregion: + err_no_gpio: + err_no_mem: + spi_master_put(master); + return status; +} + +static void +pl022_remove(struct amba_device *adev) +{ + struct pl022 *pl022 = amba_get_drvdata(adev); + + if (!pl022) + return; + + /* + * undo pm_runtime_put() in probe. I assume that we're not + * accessing the primecell here. + */ + pm_runtime_get_noresume(&adev->dev); + + load_ssp_default_config(pl022); + if (pl022->master_info->enable_dma) + pl022_dma_remove(pl022); + + clk_disable_unprepare(pl022->clk); + amba_release_regions(adev); + tasklet_disable(&pl022->pump_transfers); +} + +#ifdef CONFIG_PM_SLEEP +static int pl022_suspend(struct device *dev) +{ + struct pl022 *pl022 = dev_get_drvdata(dev); + int ret; + + ret = spi_master_suspend(pl022->master); + if (ret) + return ret; + + ret = pm_runtime_force_suspend(dev); + if (ret) { + spi_master_resume(pl022->master); + return ret; + } + + pinctrl_pm_select_sleep_state(dev); + + dev_dbg(dev, "suspended\n"); + return 0; +} + +static int pl022_resume(struct device *dev) +{ + struct pl022 *pl022 = dev_get_drvdata(dev); + int ret; + + ret = pm_runtime_force_resume(dev); + if (ret) + dev_err(dev, "problem resuming\n"); + + /* Start the queue running */ + ret = spi_master_resume(pl022->master); + if (!ret) + dev_dbg(dev, "resumed\n"); + + return ret; +} +#endif + +#ifdef CONFIG_PM +static int pl022_runtime_suspend(struct device *dev) +{ + struct pl022 *pl022 = dev_get_drvdata(dev); + + clk_disable_unprepare(pl022->clk); + pinctrl_pm_select_idle_state(dev); + + return 0; +} + +static int pl022_runtime_resume(struct device *dev) +{ + struct pl022 *pl022 = dev_get_drvdata(dev); + + pinctrl_pm_select_default_state(dev); + clk_prepare_enable(pl022->clk); + + return 0; +} +#endif + +static const struct dev_pm_ops pl022_dev_pm_ops = { + SET_SYSTEM_SLEEP_PM_OPS(pl022_suspend, pl022_resume) + SET_RUNTIME_PM_OPS(pl022_runtime_suspend, pl022_runtime_resume, NULL) +}; + +static struct vendor_data vendor_arm = { + .fifodepth = 8, + .max_bpw = 16, + .unidir = false, + .extended_cr = false, + .pl023 = false, + .loopback = true, + .internal_cs_ctrl = false, +}; + +static struct vendor_data vendor_st = { + .fifodepth = 32, + .max_bpw = 32, + .unidir = false, + .extended_cr = true, + .pl023 = false, + .loopback = true, + .internal_cs_ctrl = false, +}; + +static struct vendor_data vendor_st_pl023 = { + .fifodepth = 32, + .max_bpw = 32, + .unidir = false, + .extended_cr = true, + .pl023 = true, + .loopback = false, + .internal_cs_ctrl = false, +}; + +static struct vendor_data vendor_lsi = { + .fifodepth = 8, + .max_bpw = 16, + .unidir = false, + .extended_cr = false, + .pl023 = false, + .loopback = true, + .internal_cs_ctrl = true, +}; + +static const struct amba_id pl022_ids[] = { + { + /* + * ARM PL022 variant, this has a 16bit wide + * and 8 locations deep TX/RX FIFO + */ + .id = 0x00041022, + .mask = 0x000fffff, + .data = &vendor_arm, + }, + { + /* + * ST Micro derivative, this has 32bit wide + * and 32 locations deep TX/RX FIFO + */ + .id = 0x01080022, + .mask = 0xffffffff, + .data = &vendor_st, + }, + { + /* + * ST-Ericsson derivative "PL023" (this is not + * an official ARM number), this is a PL022 SSP block + * stripped to SPI mode only, it has 32bit wide + * and 32 locations deep TX/RX FIFO but no extended + * CR0/CR1 register + */ + .id = 0x00080023, + .mask = 0xffffffff, + .data = &vendor_st_pl023, + }, + { + /* + * PL022 variant that has a chip select control register whih + * allows control of 5 output signals nCS[0:4]. + */ + .id = 0x000b6022, + .mask = 0x000fffff, + .data = &vendor_lsi, + }, + { 0, 0 }, +}; + +MODULE_DEVICE_TABLE(amba, pl022_ids); + +static struct amba_driver pl022_driver = { + .drv = { + .name = "ssp-pl022", + .pm = &pl022_dev_pm_ops, + }, + .id_table = pl022_ids, + .probe = pl022_probe, + .remove = pl022_remove, +}; + +static int __init pl022_init(void) +{ + return amba_driver_register(&pl022_driver); +} +subsys_initcall(pl022_init); + +static void __exit pl022_exit(void) +{ + amba_driver_unregister(&pl022_driver); +} +module_exit(pl022_exit); + +MODULE_AUTHOR("Linus Walleij <linus.walleij@stericsson.com>"); +MODULE_DESCRIPTION("PL022 SSP Controller Driver"); +MODULE_LICENSE("GPL"); diff --git a/drivers/spi/spi-ppc4xx.c b/drivers/spi/spi-ppc4xx.c new file mode 100644 index 000000000..d8ee363fb --- /dev/null +++ b/drivers/spi/spi-ppc4xx.c @@ -0,0 +1,499 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * SPI_PPC4XX SPI controller driver. + * + * Copyright (C) 2007 Gary Jennejohn <garyj@denx.de> + * Copyright 2008 Stefan Roese <sr@denx.de>, DENX Software Engineering + * Copyright 2009 Harris Corporation, Steven A. Falco <sfalco@harris.com> + * + * Based in part on drivers/spi/spi_s3c24xx.c + * + * Copyright (c) 2006 Ben Dooks + * Copyright (c) 2006 Simtec Electronics + * Ben Dooks <ben@simtec.co.uk> + */ + +/* + * The PPC4xx SPI controller has no FIFO so each sent/received byte will + * generate an interrupt to the CPU. This can cause high CPU utilization. + * This driver allows platforms to reduce the interrupt load on the CPU + * during SPI transfers by setting max_speed_hz via the device tree. + */ + +#include <linux/module.h> +#include <linux/sched.h> +#include <linux/slab.h> +#include <linux/errno.h> +#include <linux/wait.h> +#include <linux/of_address.h> +#include <linux/of_irq.h> +#include <linux/of_platform.h> +#include <linux/interrupt.h> +#include <linux/delay.h> + +#include <linux/spi/spi.h> +#include <linux/spi/spi_bitbang.h> + +#include <asm/io.h> +#include <asm/dcr.h> +#include <asm/dcr-regs.h> + +/* bits in mode register - bit 0 is MSb */ + +/* + * SPI_PPC4XX_MODE_SCP = 0 means "data latched on trailing edge of clock" + * SPI_PPC4XX_MODE_SCP = 1 means "data latched on leading edge of clock" + * Note: This is the inverse of CPHA. + */ +#define SPI_PPC4XX_MODE_SCP (0x80 >> 3) + +/* SPI_PPC4XX_MODE_SPE = 1 means "port enabled" */ +#define SPI_PPC4XX_MODE_SPE (0x80 >> 4) + +/* + * SPI_PPC4XX_MODE_RD = 0 means "MSB first" - this is the normal mode + * SPI_PPC4XX_MODE_RD = 1 means "LSB first" - this is bit-reversed mode + * Note: This is identical to SPI_LSB_FIRST. + */ +#define SPI_PPC4XX_MODE_RD (0x80 >> 5) + +/* + * SPI_PPC4XX_MODE_CI = 0 means "clock idles low" + * SPI_PPC4XX_MODE_CI = 1 means "clock idles high" + * Note: This is identical to CPOL. + */ +#define SPI_PPC4XX_MODE_CI (0x80 >> 6) + +/* + * SPI_PPC4XX_MODE_IL = 0 means "loopback disable" + * SPI_PPC4XX_MODE_IL = 1 means "loopback enable" + */ +#define SPI_PPC4XX_MODE_IL (0x80 >> 7) + +/* bits in control register */ +/* starts a transfer when set */ +#define SPI_PPC4XX_CR_STR (0x80 >> 7) + +/* bits in status register */ +/* port is busy with a transfer */ +#define SPI_PPC4XX_SR_BSY (0x80 >> 6) +/* RxD ready */ +#define SPI_PPC4XX_SR_RBR (0x80 >> 7) + +/* clock settings (SCP and CI) for various SPI modes */ +#define SPI_CLK_MODE0 (SPI_PPC4XX_MODE_SCP | 0) +#define SPI_CLK_MODE1 (0 | 0) +#define SPI_CLK_MODE2 (SPI_PPC4XX_MODE_SCP | SPI_PPC4XX_MODE_CI) +#define SPI_CLK_MODE3 (0 | SPI_PPC4XX_MODE_CI) + +#define DRIVER_NAME "spi_ppc4xx_of" + +struct spi_ppc4xx_regs { + u8 mode; + u8 rxd; + u8 txd; + u8 cr; + u8 sr; + u8 dummy; + /* + * Clock divisor modulus register + * This uses the following formula: + * SCPClkOut = OPBCLK/(4(CDM + 1)) + * or + * CDM = (OPBCLK/4*SCPClkOut) - 1 + * bit 0 is the MSb! + */ + u8 cdm; +}; + +/* SPI Controller driver's private data. */ +struct ppc4xx_spi { + /* bitbang has to be first */ + struct spi_bitbang bitbang; + struct completion done; + + u64 mapbase; + u64 mapsize; + int irqnum; + /* need this to set the SPI clock */ + unsigned int opb_freq; + + /* for transfers */ + int len; + int count; + /* data buffers */ + const unsigned char *tx; + unsigned char *rx; + + struct spi_ppc4xx_regs __iomem *regs; /* pointer to the registers */ + struct spi_master *master; + struct device *dev; +}; + +/* need this so we can set the clock in the chipselect routine */ +struct spi_ppc4xx_cs { + u8 mode; +}; + +static int spi_ppc4xx_txrx(struct spi_device *spi, struct spi_transfer *t) +{ + struct ppc4xx_spi *hw; + u8 data; + + dev_dbg(&spi->dev, "txrx: tx %p, rx %p, len %d\n", + t->tx_buf, t->rx_buf, t->len); + + hw = spi_master_get_devdata(spi->master); + + hw->tx = t->tx_buf; + hw->rx = t->rx_buf; + hw->len = t->len; + hw->count = 0; + + /* send the first byte */ + data = hw->tx ? hw->tx[0] : 0; + out_8(&hw->regs->txd, data); + out_8(&hw->regs->cr, SPI_PPC4XX_CR_STR); + wait_for_completion(&hw->done); + + return hw->count; +} + +static int spi_ppc4xx_setupxfer(struct spi_device *spi, struct spi_transfer *t) +{ + struct ppc4xx_spi *hw = spi_master_get_devdata(spi->master); + struct spi_ppc4xx_cs *cs = spi->controller_state; + int scr; + u8 cdm = 0; + u32 speed; + u8 bits_per_word; + + /* Start with the generic configuration for this device. */ + bits_per_word = spi->bits_per_word; + speed = spi->max_speed_hz; + + /* + * Modify the configuration if the transfer overrides it. Do not allow + * the transfer to overwrite the generic configuration with zeros. + */ + if (t) { + if (t->bits_per_word) + bits_per_word = t->bits_per_word; + + if (t->speed_hz) + speed = min(t->speed_hz, spi->max_speed_hz); + } + + if (!speed || (speed > spi->max_speed_hz)) { + dev_err(&spi->dev, "invalid speed_hz (%d)\n", speed); + return -EINVAL; + } + + /* Write new configuration */ + out_8(&hw->regs->mode, cs->mode); + + /* Set the clock */ + /* opb_freq was already divided by 4 */ + scr = (hw->opb_freq / speed) - 1; + if (scr > 0) + cdm = min(scr, 0xff); + + dev_dbg(&spi->dev, "setting pre-scaler to %d (hz %d)\n", cdm, speed); + + if (in_8(&hw->regs->cdm) != cdm) + out_8(&hw->regs->cdm, cdm); + + mutex_lock(&hw->bitbang.lock); + if (!hw->bitbang.busy) { + hw->bitbang.chipselect(spi, BITBANG_CS_INACTIVE); + /* Need to ndelay here? */ + } + mutex_unlock(&hw->bitbang.lock); + + return 0; +} + +static int spi_ppc4xx_setup(struct spi_device *spi) +{ + struct spi_ppc4xx_cs *cs = spi->controller_state; + + if (!spi->max_speed_hz) { + dev_err(&spi->dev, "invalid max_speed_hz (must be non-zero)\n"); + return -EINVAL; + } + + if (cs == NULL) { + cs = kzalloc(sizeof *cs, GFP_KERNEL); + if (!cs) + return -ENOMEM; + spi->controller_state = cs; + } + + /* + * We set all bits of the SPI0_MODE register, so, + * no need to read-modify-write + */ + cs->mode = SPI_PPC4XX_MODE_SPE; + + switch (spi->mode & (SPI_CPHA | SPI_CPOL)) { + case SPI_MODE_0: + cs->mode |= SPI_CLK_MODE0; + break; + case SPI_MODE_1: + cs->mode |= SPI_CLK_MODE1; + break; + case SPI_MODE_2: + cs->mode |= SPI_CLK_MODE2; + break; + case SPI_MODE_3: + cs->mode |= SPI_CLK_MODE3; + break; + } + + if (spi->mode & SPI_LSB_FIRST) + cs->mode |= SPI_PPC4XX_MODE_RD; + + return 0; +} + +static irqreturn_t spi_ppc4xx_int(int irq, void *dev_id) +{ + struct ppc4xx_spi *hw; + u8 status; + u8 data; + unsigned int count; + + hw = (struct ppc4xx_spi *)dev_id; + + status = in_8(&hw->regs->sr); + if (!status) + return IRQ_NONE; + + /* + * BSY de-asserts one cycle after the transfer is complete. The + * interrupt is asserted after the transfer is complete. The exact + * relationship is not documented, hence this code. + */ + + if (unlikely(status & SPI_PPC4XX_SR_BSY)) { + u8 lstatus; + int cnt = 0; + + dev_dbg(hw->dev, "got interrupt but spi still busy?\n"); + do { + ndelay(10); + lstatus = in_8(&hw->regs->sr); + } while (++cnt < 100 && lstatus & SPI_PPC4XX_SR_BSY); + + if (cnt >= 100) { + dev_err(hw->dev, "busywait: too many loops!\n"); + complete(&hw->done); + return IRQ_HANDLED; + } else { + /* status is always 1 (RBR) here */ + status = in_8(&hw->regs->sr); + dev_dbg(hw->dev, "loops %d status %x\n", cnt, status); + } + } + + count = hw->count; + hw->count++; + + /* RBR triggered this interrupt. Therefore, data must be ready. */ + data = in_8(&hw->regs->rxd); + if (hw->rx) + hw->rx[count] = data; + + count++; + + if (count < hw->len) { + data = hw->tx ? hw->tx[count] : 0; + out_8(&hw->regs->txd, data); + out_8(&hw->regs->cr, SPI_PPC4XX_CR_STR); + } else { + complete(&hw->done); + } + + return IRQ_HANDLED; +} + +static void spi_ppc4xx_cleanup(struct spi_device *spi) +{ + kfree(spi->controller_state); +} + +static void spi_ppc4xx_enable(struct ppc4xx_spi *hw) +{ + /* + * On all 4xx PPC's the SPI bus is shared/multiplexed with + * the 2nd I2C bus. We need to enable the the SPI bus before + * using it. + */ + + /* need to clear bit 14 to enable SPC */ + dcri_clrset(SDR0, SDR0_PFC1, 0x80000000 >> 14, 0); +} + +/* + * platform_device layer stuff... + */ +static int spi_ppc4xx_of_probe(struct platform_device *op) +{ + struct ppc4xx_spi *hw; + struct spi_master *master; + struct spi_bitbang *bbp; + struct resource resource; + struct device_node *np = op->dev.of_node; + struct device *dev = &op->dev; + struct device_node *opbnp; + int ret; + const unsigned int *clk; + + master = spi_alloc_master(dev, sizeof *hw); + if (master == NULL) + return -ENOMEM; + master->dev.of_node = np; + platform_set_drvdata(op, master); + hw = spi_master_get_devdata(master); + hw->master = master; + hw->dev = dev; + + init_completion(&hw->done); + + /* Setup the state for the bitbang driver */ + bbp = &hw->bitbang; + bbp->master = hw->master; + bbp->setup_transfer = spi_ppc4xx_setupxfer; + bbp->txrx_bufs = spi_ppc4xx_txrx; + bbp->use_dma = 0; + bbp->master->setup = spi_ppc4xx_setup; + bbp->master->cleanup = spi_ppc4xx_cleanup; + bbp->master->bits_per_word_mask = SPI_BPW_MASK(8); + bbp->master->use_gpio_descriptors = true; + /* + * The SPI core will count the number of GPIO descriptors to figure + * out the number of chip selects available on the platform. + */ + bbp->master->num_chipselect = 0; + + /* the spi->mode bits understood by this driver: */ + bbp->master->mode_bits = + SPI_CPHA | SPI_CPOL | SPI_CS_HIGH | SPI_LSB_FIRST; + + /* Get the clock for the OPB */ + opbnp = of_find_compatible_node(NULL, NULL, "ibm,opb"); + if (opbnp == NULL) { + dev_err(dev, "OPB: cannot find node\n"); + ret = -ENODEV; + goto free_master; + } + /* Get the clock (Hz) for the OPB */ + clk = of_get_property(opbnp, "clock-frequency", NULL); + if (clk == NULL) { + dev_err(dev, "OPB: no clock-frequency property set\n"); + of_node_put(opbnp); + ret = -ENODEV; + goto free_master; + } + hw->opb_freq = *clk; + hw->opb_freq >>= 2; + of_node_put(opbnp); + + ret = of_address_to_resource(np, 0, &resource); + if (ret) { + dev_err(dev, "error while parsing device node resource\n"); + goto free_master; + } + hw->mapbase = resource.start; + hw->mapsize = resource_size(&resource); + + /* Sanity check */ + if (hw->mapsize < sizeof(struct spi_ppc4xx_regs)) { + dev_err(dev, "too small to map registers\n"); + ret = -EINVAL; + goto free_master; + } + + /* Request IRQ */ + hw->irqnum = irq_of_parse_and_map(np, 0); + ret = request_irq(hw->irqnum, spi_ppc4xx_int, + 0, "spi_ppc4xx_of", (void *)hw); + if (ret) { + dev_err(dev, "unable to allocate interrupt\n"); + goto free_master; + } + + if (!request_mem_region(hw->mapbase, hw->mapsize, DRIVER_NAME)) { + dev_err(dev, "resource unavailable\n"); + ret = -EBUSY; + goto request_mem_error; + } + + hw->regs = ioremap(hw->mapbase, sizeof(struct spi_ppc4xx_regs)); + + if (!hw->regs) { + dev_err(dev, "unable to memory map registers\n"); + ret = -ENXIO; + goto map_io_error; + } + + spi_ppc4xx_enable(hw); + + /* Finally register our spi controller */ + dev->dma_mask = 0; + ret = spi_bitbang_start(bbp); + if (ret) { + dev_err(dev, "failed to register SPI master\n"); + goto unmap_regs; + } + + dev_info(dev, "driver initialized\n"); + + return 0; + +unmap_regs: + iounmap(hw->regs); +map_io_error: + release_mem_region(hw->mapbase, hw->mapsize); +request_mem_error: + free_irq(hw->irqnum, hw); +free_master: + spi_master_put(master); + + dev_err(dev, "initialization failed\n"); + return ret; +} + +static int spi_ppc4xx_of_remove(struct platform_device *op) +{ + struct spi_master *master = platform_get_drvdata(op); + struct ppc4xx_spi *hw = spi_master_get_devdata(master); + + spi_bitbang_stop(&hw->bitbang); + release_mem_region(hw->mapbase, hw->mapsize); + free_irq(hw->irqnum, hw); + iounmap(hw->regs); + spi_master_put(master); + return 0; +} + +static const struct of_device_id spi_ppc4xx_of_match[] = { + { .compatible = "ibm,ppc4xx-spi", }, + {}, +}; + +MODULE_DEVICE_TABLE(of, spi_ppc4xx_of_match); + +static struct platform_driver spi_ppc4xx_of_driver = { + .probe = spi_ppc4xx_of_probe, + .remove = spi_ppc4xx_of_remove, + .driver = { + .name = DRIVER_NAME, + .of_match_table = spi_ppc4xx_of_match, + }, +}; +module_platform_driver(spi_ppc4xx_of_driver); + +MODULE_AUTHOR("Gary Jennejohn & Stefan Roese"); +MODULE_DESCRIPTION("Simple PPC4xx SPI Driver"); +MODULE_LICENSE("GPL"); diff --git a/drivers/spi/spi-pxa2xx-dma.c b/drivers/spi/spi-pxa2xx-dma.c new file mode 100644 index 000000000..37567bc7a --- /dev/null +++ b/drivers/spi/spi-pxa2xx-dma.c @@ -0,0 +1,252 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * PXA2xx SPI DMA engine support. + * + * Copyright (C) 2013, Intel Corporation + * Author: Mika Westerberg <mika.westerberg@linux.intel.com> + */ + +#include <linux/device.h> +#include <linux/dma-mapping.h> +#include <linux/dmaengine.h> +#include <linux/pxa2xx_ssp.h> +#include <linux/scatterlist.h> +#include <linux/sizes.h> +#include <linux/spi/spi.h> +#include <linux/spi/pxa2xx_spi.h> + +#include "spi-pxa2xx.h" + +static void pxa2xx_spi_dma_transfer_complete(struct driver_data *drv_data, + bool error) +{ + struct spi_message *msg = drv_data->controller->cur_msg; + + /* + * It is possible that one CPU is handling ROR interrupt and other + * just gets DMA completion. Calling pump_transfers() twice for the + * same transfer leads to problems thus we prevent concurrent calls + * by using ->dma_running. + */ + if (atomic_dec_and_test(&drv_data->dma_running)) { + /* + * If the other CPU is still handling the ROR interrupt we + * might not know about the error yet. So we re-check the + * ROR bit here before we clear the status register. + */ + if (!error) { + u32 status = pxa2xx_spi_read(drv_data, SSSR) + & drv_data->mask_sr; + error = status & SSSR_ROR; + } + + /* Clear status & disable interrupts */ + pxa2xx_spi_write(drv_data, SSCR1, + pxa2xx_spi_read(drv_data, SSCR1) + & ~drv_data->dma_cr1); + write_SSSR_CS(drv_data, drv_data->clear_sr); + if (!pxa25x_ssp_comp(drv_data)) + pxa2xx_spi_write(drv_data, SSTO, 0); + + if (error) { + /* In case we got an error we disable the SSP now */ + pxa2xx_spi_write(drv_data, SSCR0, + pxa2xx_spi_read(drv_data, SSCR0) + & ~SSCR0_SSE); + msg->status = -EIO; + } + + spi_finalize_current_transfer(drv_data->controller); + } +} + +static void pxa2xx_spi_dma_callback(void *data) +{ + pxa2xx_spi_dma_transfer_complete(data, false); +} + +static struct dma_async_tx_descriptor * +pxa2xx_spi_dma_prepare_one(struct driver_data *drv_data, + enum dma_transfer_direction dir, + struct spi_transfer *xfer) +{ + struct chip_data *chip = + spi_get_ctldata(drv_data->controller->cur_msg->spi); + enum dma_slave_buswidth width; + struct dma_slave_config cfg; + struct dma_chan *chan; + struct sg_table *sgt; + int ret; + + switch (drv_data->n_bytes) { + case 1: + width = DMA_SLAVE_BUSWIDTH_1_BYTE; + break; + case 2: + width = DMA_SLAVE_BUSWIDTH_2_BYTES; + break; + default: + width = DMA_SLAVE_BUSWIDTH_4_BYTES; + break; + } + + memset(&cfg, 0, sizeof(cfg)); + cfg.direction = dir; + + if (dir == DMA_MEM_TO_DEV) { + cfg.dst_addr = drv_data->ssdr_physical; + cfg.dst_addr_width = width; + cfg.dst_maxburst = chip->dma_burst_size; + + sgt = &xfer->tx_sg; + chan = drv_data->controller->dma_tx; + } else { + cfg.src_addr = drv_data->ssdr_physical; + cfg.src_addr_width = width; + cfg.src_maxburst = chip->dma_burst_size; + + sgt = &xfer->rx_sg; + chan = drv_data->controller->dma_rx; + } + + ret = dmaengine_slave_config(chan, &cfg); + if (ret) { + dev_warn(&drv_data->pdev->dev, "DMA slave config failed\n"); + return NULL; + } + + return dmaengine_prep_slave_sg(chan, sgt->sgl, sgt->nents, dir, + DMA_PREP_INTERRUPT | DMA_CTRL_ACK); +} + +irqreturn_t pxa2xx_spi_dma_transfer(struct driver_data *drv_data) +{ + u32 status; + + status = pxa2xx_spi_read(drv_data, SSSR) & drv_data->mask_sr; + if (status & SSSR_ROR) { + dev_err(&drv_data->pdev->dev, "FIFO overrun\n"); + + dmaengine_terminate_async(drv_data->controller->dma_rx); + dmaengine_terminate_async(drv_data->controller->dma_tx); + + pxa2xx_spi_dma_transfer_complete(drv_data, true); + return IRQ_HANDLED; + } + + return IRQ_NONE; +} + +int pxa2xx_spi_dma_prepare(struct driver_data *drv_data, + struct spi_transfer *xfer) +{ + struct dma_async_tx_descriptor *tx_desc, *rx_desc; + int err; + + tx_desc = pxa2xx_spi_dma_prepare_one(drv_data, DMA_MEM_TO_DEV, xfer); + if (!tx_desc) { + dev_err(&drv_data->pdev->dev, + "failed to get DMA TX descriptor\n"); + err = -EBUSY; + goto err_tx; + } + + rx_desc = pxa2xx_spi_dma_prepare_one(drv_data, DMA_DEV_TO_MEM, xfer); + if (!rx_desc) { + dev_err(&drv_data->pdev->dev, + "failed to get DMA RX descriptor\n"); + err = -EBUSY; + goto err_rx; + } + + /* We are ready when RX completes */ + rx_desc->callback = pxa2xx_spi_dma_callback; + rx_desc->callback_param = drv_data; + + dmaengine_submit(rx_desc); + dmaengine_submit(tx_desc); + return 0; + +err_rx: + dmaengine_terminate_async(drv_data->controller->dma_tx); +err_tx: + return err; +} + +void pxa2xx_spi_dma_start(struct driver_data *drv_data) +{ + dma_async_issue_pending(drv_data->controller->dma_rx); + dma_async_issue_pending(drv_data->controller->dma_tx); + + atomic_set(&drv_data->dma_running, 1); +} + +void pxa2xx_spi_dma_stop(struct driver_data *drv_data) +{ + atomic_set(&drv_data->dma_running, 0); + dmaengine_terminate_sync(drv_data->controller->dma_rx); + dmaengine_terminate_sync(drv_data->controller->dma_tx); +} + +int pxa2xx_spi_dma_setup(struct driver_data *drv_data) +{ + struct pxa2xx_spi_controller *pdata = drv_data->controller_info; + struct device *dev = &drv_data->pdev->dev; + struct spi_controller *controller = drv_data->controller; + dma_cap_mask_t mask; + + dma_cap_zero(mask); + dma_cap_set(DMA_SLAVE, mask); + + controller->dma_tx = dma_request_slave_channel_compat(mask, + pdata->dma_filter, pdata->tx_param, dev, "tx"); + if (!controller->dma_tx) + return -ENODEV; + + controller->dma_rx = dma_request_slave_channel_compat(mask, + pdata->dma_filter, pdata->rx_param, dev, "rx"); + if (!controller->dma_rx) { + dma_release_channel(controller->dma_tx); + controller->dma_tx = NULL; + return -ENODEV; + } + + return 0; +} + +void pxa2xx_spi_dma_release(struct driver_data *drv_data) +{ + struct spi_controller *controller = drv_data->controller; + + if (controller->dma_rx) { + dmaengine_terminate_sync(controller->dma_rx); + dma_release_channel(controller->dma_rx); + controller->dma_rx = NULL; + } + if (controller->dma_tx) { + dmaengine_terminate_sync(controller->dma_tx); + dma_release_channel(controller->dma_tx); + controller->dma_tx = NULL; + } +} + +int pxa2xx_spi_set_dma_burst_and_threshold(struct chip_data *chip, + struct spi_device *spi, + u8 bits_per_word, u32 *burst_code, + u32 *threshold) +{ + struct pxa2xx_spi_chip *chip_info = spi->controller_data; + struct driver_data *drv_data = spi_controller_get_devdata(spi->controller); + u32 dma_burst_size = drv_data->controller_info->dma_burst_size; + + /* + * If the DMA burst size is given in chip_info we use that, + * otherwise we use the default. Also we use the default FIFO + * thresholds for now. + */ + *burst_code = chip_info ? chip_info->dma_burst_size : dma_burst_size; + *threshold = SSCR1_RxTresh(RX_THRESH_DFLT) + | SSCR1_TxTresh(TX_THRESH_DFLT); + + return 0; +} diff --git a/drivers/spi/spi-pxa2xx-pci.c b/drivers/spi/spi-pxa2xx-pci.c new file mode 100644 index 000000000..4eb979a09 --- /dev/null +++ b/drivers/spi/spi-pxa2xx-pci.c @@ -0,0 +1,330 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * CE4100's SPI device is more or less the same one as found on PXA + * + * Copyright (C) 2016, Intel Corporation + */ +#include <linux/clk-provider.h> +#include <linux/module.h> +#include <linux/pci.h> +#include <linux/platform_device.h> +#include <linux/spi/pxa2xx_spi.h> + +#include <linux/dmaengine.h> +#include <linux/platform_data/dma-dw.h> + +enum { + PORT_QUARK_X1000, + PORT_BYT, + PORT_MRFLD, + PORT_BSW0, + PORT_BSW1, + PORT_BSW2, + PORT_CE4100, + PORT_LPT0, + PORT_LPT1, +}; + +struct pxa_spi_info { + enum pxa_ssp_type type; + int port_id; + int num_chipselect; + unsigned long max_clk_rate; + + /* DMA channel request parameters */ + bool (*dma_filter)(struct dma_chan *chan, void *param); + void *tx_param; + void *rx_param; + + int dma_burst_size; + + int (*setup)(struct pci_dev *pdev, struct pxa_spi_info *c); +}; + +static struct dw_dma_slave byt_tx_param = { .dst_id = 0 }; +static struct dw_dma_slave byt_rx_param = { .src_id = 1 }; + +static struct dw_dma_slave mrfld3_tx_param = { .dst_id = 15 }; +static struct dw_dma_slave mrfld3_rx_param = { .src_id = 14 }; +static struct dw_dma_slave mrfld5_tx_param = { .dst_id = 13 }; +static struct dw_dma_slave mrfld5_rx_param = { .src_id = 12 }; +static struct dw_dma_slave mrfld6_tx_param = { .dst_id = 11 }; +static struct dw_dma_slave mrfld6_rx_param = { .src_id = 10 }; + +static struct dw_dma_slave bsw0_tx_param = { .dst_id = 0 }; +static struct dw_dma_slave bsw0_rx_param = { .src_id = 1 }; +static struct dw_dma_slave bsw1_tx_param = { .dst_id = 6 }; +static struct dw_dma_slave bsw1_rx_param = { .src_id = 7 }; +static struct dw_dma_slave bsw2_tx_param = { .dst_id = 8 }; +static struct dw_dma_slave bsw2_rx_param = { .src_id = 9 }; + +static struct dw_dma_slave lpt1_tx_param = { .dst_id = 0 }; +static struct dw_dma_slave lpt1_rx_param = { .src_id = 1 }; +static struct dw_dma_slave lpt0_tx_param = { .dst_id = 2 }; +static struct dw_dma_slave lpt0_rx_param = { .src_id = 3 }; + +static bool lpss_dma_filter(struct dma_chan *chan, void *param) +{ + struct dw_dma_slave *dws = param; + + if (dws->dma_dev != chan->device->dev) + return false; + + chan->private = dws; + return true; +} + +static void lpss_dma_put_device(void *dma_dev) +{ + pci_dev_put(dma_dev); +} + +static int lpss_spi_setup(struct pci_dev *dev, struct pxa_spi_info *c) +{ + struct pci_dev *dma_dev; + int ret; + + c->num_chipselect = 1; + c->max_clk_rate = 50000000; + + dma_dev = pci_get_slot(dev->bus, PCI_DEVFN(PCI_SLOT(dev->devfn), 0)); + ret = devm_add_action_or_reset(&dev->dev, lpss_dma_put_device, dma_dev); + if (ret) + return ret; + + if (c->tx_param) { + struct dw_dma_slave *slave = c->tx_param; + + slave->dma_dev = &dma_dev->dev; + slave->m_master = 0; + slave->p_master = 1; + } + + if (c->rx_param) { + struct dw_dma_slave *slave = c->rx_param; + + slave->dma_dev = &dma_dev->dev; + slave->m_master = 0; + slave->p_master = 1; + } + + c->dma_filter = lpss_dma_filter; + return 0; +} + +static int mrfld_spi_setup(struct pci_dev *dev, struct pxa_spi_info *c) +{ + struct dw_dma_slave *tx, *rx; + struct pci_dev *dma_dev; + int ret; + + switch (PCI_FUNC(dev->devfn)) { + case 0: + c->port_id = 3; + c->num_chipselect = 1; + c->tx_param = &mrfld3_tx_param; + c->rx_param = &mrfld3_rx_param; + break; + case 1: + c->port_id = 5; + c->num_chipselect = 4; + c->tx_param = &mrfld5_tx_param; + c->rx_param = &mrfld5_rx_param; + break; + case 2: + c->port_id = 6; + c->num_chipselect = 1; + c->tx_param = &mrfld6_tx_param; + c->rx_param = &mrfld6_rx_param; + break; + default: + return -ENODEV; + } + + dma_dev = pci_get_slot(dev->bus, PCI_DEVFN(21, 0)); + ret = devm_add_action_or_reset(&dev->dev, lpss_dma_put_device, dma_dev); + if (ret) + return ret; + + tx = c->tx_param; + tx->dma_dev = &dma_dev->dev; + + rx = c->rx_param; + rx->dma_dev = &dma_dev->dev; + + c->dma_filter = lpss_dma_filter; + c->dma_burst_size = 8; + return 0; +} + +static struct pxa_spi_info spi_info_configs[] = { + [PORT_CE4100] = { + .type = PXA25x_SSP, + .port_id = -1, + .num_chipselect = -1, + .max_clk_rate = 3686400, + }, + [PORT_BYT] = { + .type = LPSS_BYT_SSP, + .port_id = 0, + .setup = lpss_spi_setup, + .tx_param = &byt_tx_param, + .rx_param = &byt_rx_param, + }, + [PORT_BSW0] = { + .type = LPSS_BSW_SSP, + .port_id = 0, + .setup = lpss_spi_setup, + .tx_param = &bsw0_tx_param, + .rx_param = &bsw0_rx_param, + }, + [PORT_BSW1] = { + .type = LPSS_BSW_SSP, + .port_id = 1, + .setup = lpss_spi_setup, + .tx_param = &bsw1_tx_param, + .rx_param = &bsw1_rx_param, + }, + [PORT_BSW2] = { + .type = LPSS_BSW_SSP, + .port_id = 2, + .setup = lpss_spi_setup, + .tx_param = &bsw2_tx_param, + .rx_param = &bsw2_rx_param, + }, + [PORT_MRFLD] = { + .type = PXA27x_SSP, + .max_clk_rate = 25000000, + .setup = mrfld_spi_setup, + }, + [PORT_QUARK_X1000] = { + .type = QUARK_X1000_SSP, + .port_id = -1, + .num_chipselect = 1, + .max_clk_rate = 50000000, + }, + [PORT_LPT0] = { + .type = LPSS_LPT_SSP, + .port_id = 0, + .setup = lpss_spi_setup, + .tx_param = &lpt0_tx_param, + .rx_param = &lpt0_rx_param, + }, + [PORT_LPT1] = { + .type = LPSS_LPT_SSP, + .port_id = 1, + .setup = lpss_spi_setup, + .tx_param = &lpt1_tx_param, + .rx_param = &lpt1_rx_param, + }, +}; + +static int pxa2xx_spi_pci_probe(struct pci_dev *dev, + const struct pci_device_id *ent) +{ + struct platform_device_info pi; + int ret; + struct platform_device *pdev; + struct pxa2xx_spi_controller spi_pdata; + struct ssp_device *ssp; + struct pxa_spi_info *c; + char buf[40]; + + ret = pcim_enable_device(dev); + if (ret) + return ret; + + ret = pcim_iomap_regions(dev, 1 << 0, "PXA2xx SPI"); + if (ret) + return ret; + + c = &spi_info_configs[ent->driver_data]; + if (c->setup) { + ret = c->setup(dev, c); + if (ret) + return ret; + } + + memset(&spi_pdata, 0, sizeof(spi_pdata)); + spi_pdata.num_chipselect = (c->num_chipselect > 0) ? c->num_chipselect : dev->devfn; + spi_pdata.dma_filter = c->dma_filter; + spi_pdata.tx_param = c->tx_param; + spi_pdata.rx_param = c->rx_param; + spi_pdata.enable_dma = c->rx_param && c->tx_param; + spi_pdata.dma_burst_size = c->dma_burst_size ? c->dma_burst_size : 1; + + ssp = &spi_pdata.ssp; + ssp->phys_base = pci_resource_start(dev, 0); + ssp->mmio_base = pcim_iomap_table(dev)[0]; + ssp->port_id = (c->port_id >= 0) ? c->port_id : dev->devfn; + ssp->type = c->type; + + pci_set_master(dev); + + ret = pci_alloc_irq_vectors(dev, 1, 1, PCI_IRQ_ALL_TYPES); + if (ret < 0) + return ret; + ssp->irq = pci_irq_vector(dev, 0); + + snprintf(buf, sizeof(buf), "pxa2xx-spi.%d", ssp->port_id); + ssp->clk = clk_register_fixed_rate(&dev->dev, buf , NULL, 0, + c->max_clk_rate); + if (IS_ERR(ssp->clk)) + return PTR_ERR(ssp->clk); + + memset(&pi, 0, sizeof(pi)); + pi.fwnode = dev->dev.fwnode; + pi.parent = &dev->dev; + pi.name = "pxa2xx-spi"; + pi.id = ssp->port_id; + pi.data = &spi_pdata; + pi.size_data = sizeof(spi_pdata); + + pdev = platform_device_register_full(&pi); + if (IS_ERR(pdev)) { + clk_unregister(ssp->clk); + return PTR_ERR(pdev); + } + + pci_set_drvdata(dev, pdev); + + return 0; +} + +static void pxa2xx_spi_pci_remove(struct pci_dev *dev) +{ + struct platform_device *pdev = pci_get_drvdata(dev); + struct pxa2xx_spi_controller *spi_pdata; + + spi_pdata = dev_get_platdata(&pdev->dev); + + platform_device_unregister(pdev); + clk_unregister(spi_pdata->ssp.clk); +} + +static const struct pci_device_id pxa2xx_spi_pci_devices[] = { + { PCI_VDEVICE(INTEL, 0x0935), PORT_QUARK_X1000 }, + { PCI_VDEVICE(INTEL, 0x0f0e), PORT_BYT }, + { PCI_VDEVICE(INTEL, 0x1194), PORT_MRFLD }, + { PCI_VDEVICE(INTEL, 0x228e), PORT_BSW0 }, + { PCI_VDEVICE(INTEL, 0x2290), PORT_BSW1 }, + { PCI_VDEVICE(INTEL, 0x22ac), PORT_BSW2 }, + { PCI_VDEVICE(INTEL, 0x2e6a), PORT_CE4100 }, + { PCI_VDEVICE(INTEL, 0x9ce5), PORT_LPT0 }, + { PCI_VDEVICE(INTEL, 0x9ce6), PORT_LPT1 }, + { } +}; +MODULE_DEVICE_TABLE(pci, pxa2xx_spi_pci_devices); + +static struct pci_driver pxa2xx_spi_pci_driver = { + .name = "pxa2xx_spi_pci", + .id_table = pxa2xx_spi_pci_devices, + .probe = pxa2xx_spi_pci_probe, + .remove = pxa2xx_spi_pci_remove, +}; + +module_pci_driver(pxa2xx_spi_pci_driver); + +MODULE_DESCRIPTION("CE4100/LPSS PCI-SPI glue code for PXA's driver"); +MODULE_LICENSE("GPL v2"); +MODULE_AUTHOR("Sebastian Andrzej Siewior <bigeasy@linutronix.de>"); diff --git a/drivers/spi/spi-pxa2xx.c b/drivers/spi/spi-pxa2xx.c new file mode 100644 index 000000000..56a62095e --- /dev/null +++ b/drivers/spi/spi-pxa2xx.c @@ -0,0 +1,2038 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Copyright (C) 2005 Stephen Street / StreetFire Sound Labs + * Copyright (C) 2013, Intel Corporation + */ + +#include <linux/acpi.h> +#include <linux/bitops.h> +#include <linux/clk.h> +#include <linux/delay.h> +#include <linux/device.h> +#include <linux/err.h> +#include <linux/errno.h> +#include <linux/gpio/consumer.h> +#include <linux/gpio.h> +#include <linux/init.h> +#include <linux/interrupt.h> +#include <linux/ioport.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/mod_devicetable.h> +#include <linux/of.h> +#include <linux/pci.h> +#include <linux/platform_device.h> +#include <linux/pm_runtime.h> +#include <linux/property.h> +#include <linux/slab.h> +#include <linux/spi/pxa2xx_spi.h> +#include <linux/spi/spi.h> + +#include "spi-pxa2xx.h" + +MODULE_AUTHOR("Stephen Street"); +MODULE_DESCRIPTION("PXA2xx SSP SPI Controller"); +MODULE_LICENSE("GPL"); +MODULE_ALIAS("platform:pxa2xx-spi"); + +#define TIMOUT_DFLT 1000 + +/* + * for testing SSCR1 changes that require SSP restart, basically + * everything except the service and interrupt enables, the pxa270 developer + * manual says only SSCR1_SCFR, SSCR1_SPH, SSCR1_SPO need to be in this + * list, but the PXA255 dev man says all bits without really meaning the + * service and interrupt enables + */ +#define SSCR1_CHANGE_MASK (SSCR1_TTELP | SSCR1_TTE | SSCR1_SCFR \ + | SSCR1_ECRA | SSCR1_ECRB | SSCR1_SCLKDIR \ + | SSCR1_SFRMDIR | SSCR1_RWOT | SSCR1_TRAIL \ + | SSCR1_IFS | SSCR1_STRF | SSCR1_EFWR \ + | SSCR1_RFT | SSCR1_TFT | SSCR1_MWDS \ + | SSCR1_SPH | SSCR1_SPO | SSCR1_LBM) + +#define QUARK_X1000_SSCR1_CHANGE_MASK (QUARK_X1000_SSCR1_STRF \ + | QUARK_X1000_SSCR1_EFWR \ + | QUARK_X1000_SSCR1_RFT \ + | QUARK_X1000_SSCR1_TFT \ + | SSCR1_SPH | SSCR1_SPO | SSCR1_LBM) + +#define CE4100_SSCR1_CHANGE_MASK (SSCR1_TTELP | SSCR1_TTE | SSCR1_SCFR \ + | SSCR1_ECRA | SSCR1_ECRB | SSCR1_SCLKDIR \ + | SSCR1_SFRMDIR | SSCR1_RWOT | SSCR1_TRAIL \ + | SSCR1_IFS | SSCR1_STRF | SSCR1_EFWR \ + | CE4100_SSCR1_RFT | CE4100_SSCR1_TFT | SSCR1_MWDS \ + | SSCR1_SPH | SSCR1_SPO | SSCR1_LBM) + +#define LPSS_GENERAL_REG_RXTO_HOLDOFF_DISABLE BIT(24) +#define LPSS_CS_CONTROL_SW_MODE BIT(0) +#define LPSS_CS_CONTROL_CS_HIGH BIT(1) +#define LPSS_CAPS_CS_EN_SHIFT 9 +#define LPSS_CAPS_CS_EN_MASK (0xf << LPSS_CAPS_CS_EN_SHIFT) + +#define LPSS_PRIV_CLOCK_GATE 0x38 +#define LPSS_PRIV_CLOCK_GATE_CLK_CTL_MASK 0x3 +#define LPSS_PRIV_CLOCK_GATE_CLK_CTL_FORCE_ON 0x3 + +struct lpss_config { + /* LPSS offset from drv_data->ioaddr */ + unsigned offset; + /* Register offsets from drv_data->lpss_base or -1 */ + int reg_general; + int reg_ssp; + int reg_cs_ctrl; + int reg_capabilities; + /* FIFO thresholds */ + u32 rx_threshold; + u32 tx_threshold_lo; + u32 tx_threshold_hi; + /* Chip select control */ + unsigned cs_sel_shift; + unsigned cs_sel_mask; + unsigned cs_num; + /* Quirks */ + unsigned cs_clk_stays_gated : 1; +}; + +/* Keep these sorted with enum pxa_ssp_type */ +static const struct lpss_config lpss_platforms[] = { + { /* LPSS_LPT_SSP */ + .offset = 0x800, + .reg_general = 0x08, + .reg_ssp = 0x0c, + .reg_cs_ctrl = 0x18, + .reg_capabilities = -1, + .rx_threshold = 64, + .tx_threshold_lo = 160, + .tx_threshold_hi = 224, + }, + { /* LPSS_BYT_SSP */ + .offset = 0x400, + .reg_general = 0x08, + .reg_ssp = 0x0c, + .reg_cs_ctrl = 0x18, + .reg_capabilities = -1, + .rx_threshold = 64, + .tx_threshold_lo = 160, + .tx_threshold_hi = 224, + }, + { /* LPSS_BSW_SSP */ + .offset = 0x400, + .reg_general = 0x08, + .reg_ssp = 0x0c, + .reg_cs_ctrl = 0x18, + .reg_capabilities = -1, + .rx_threshold = 64, + .tx_threshold_lo = 160, + .tx_threshold_hi = 224, + .cs_sel_shift = 2, + .cs_sel_mask = 1 << 2, + .cs_num = 2, + }, + { /* LPSS_SPT_SSP */ + .offset = 0x200, + .reg_general = -1, + .reg_ssp = 0x20, + .reg_cs_ctrl = 0x24, + .reg_capabilities = -1, + .rx_threshold = 1, + .tx_threshold_lo = 32, + .tx_threshold_hi = 56, + }, + { /* LPSS_BXT_SSP */ + .offset = 0x200, + .reg_general = -1, + .reg_ssp = 0x20, + .reg_cs_ctrl = 0x24, + .reg_capabilities = 0xfc, + .rx_threshold = 1, + .tx_threshold_lo = 16, + .tx_threshold_hi = 48, + .cs_sel_shift = 8, + .cs_sel_mask = 3 << 8, + .cs_clk_stays_gated = true, + }, + { /* LPSS_CNL_SSP */ + .offset = 0x200, + .reg_general = -1, + .reg_ssp = 0x20, + .reg_cs_ctrl = 0x24, + .reg_capabilities = 0xfc, + .rx_threshold = 1, + .tx_threshold_lo = 32, + .tx_threshold_hi = 56, + .cs_sel_shift = 8, + .cs_sel_mask = 3 << 8, + .cs_clk_stays_gated = true, + }, +}; + +static inline const struct lpss_config +*lpss_get_config(const struct driver_data *drv_data) +{ + return &lpss_platforms[drv_data->ssp_type - LPSS_LPT_SSP]; +} + +static bool is_lpss_ssp(const struct driver_data *drv_data) +{ + switch (drv_data->ssp_type) { + case LPSS_LPT_SSP: + case LPSS_BYT_SSP: + case LPSS_BSW_SSP: + case LPSS_SPT_SSP: + case LPSS_BXT_SSP: + case LPSS_CNL_SSP: + return true; + default: + return false; + } +} + +static bool is_quark_x1000_ssp(const struct driver_data *drv_data) +{ + return drv_data->ssp_type == QUARK_X1000_SSP; +} + +static bool is_mmp2_ssp(const struct driver_data *drv_data) +{ + return drv_data->ssp_type == MMP2_SSP; +} + +static u32 pxa2xx_spi_get_ssrc1_change_mask(const struct driver_data *drv_data) +{ + switch (drv_data->ssp_type) { + case QUARK_X1000_SSP: + return QUARK_X1000_SSCR1_CHANGE_MASK; + case CE4100_SSP: + return CE4100_SSCR1_CHANGE_MASK; + default: + return SSCR1_CHANGE_MASK; + } +} + +static u32 +pxa2xx_spi_get_rx_default_thre(const struct driver_data *drv_data) +{ + switch (drv_data->ssp_type) { + case QUARK_X1000_SSP: + return RX_THRESH_QUARK_X1000_DFLT; + case CE4100_SSP: + return RX_THRESH_CE4100_DFLT; + default: + return RX_THRESH_DFLT; + } +} + +static bool pxa2xx_spi_txfifo_full(const struct driver_data *drv_data) +{ + u32 mask; + + switch (drv_data->ssp_type) { + case QUARK_X1000_SSP: + mask = QUARK_X1000_SSSR_TFL_MASK; + break; + case CE4100_SSP: + mask = CE4100_SSSR_TFL_MASK; + break; + default: + mask = SSSR_TFL_MASK; + break; + } + + return (pxa2xx_spi_read(drv_data, SSSR) & mask) == mask; +} + +static void pxa2xx_spi_clear_rx_thre(const struct driver_data *drv_data, + u32 *sccr1_reg) +{ + u32 mask; + + switch (drv_data->ssp_type) { + case QUARK_X1000_SSP: + mask = QUARK_X1000_SSCR1_RFT; + break; + case CE4100_SSP: + mask = CE4100_SSCR1_RFT; + break; + default: + mask = SSCR1_RFT; + break; + } + *sccr1_reg &= ~mask; +} + +static void pxa2xx_spi_set_rx_thre(const struct driver_data *drv_data, + u32 *sccr1_reg, u32 threshold) +{ + switch (drv_data->ssp_type) { + case QUARK_X1000_SSP: + *sccr1_reg |= QUARK_X1000_SSCR1_RxTresh(threshold); + break; + case CE4100_SSP: + *sccr1_reg |= CE4100_SSCR1_RxTresh(threshold); + break; + default: + *sccr1_reg |= SSCR1_RxTresh(threshold); + break; + } +} + +static u32 pxa2xx_configure_sscr0(const struct driver_data *drv_data, + u32 clk_div, u8 bits) +{ + switch (drv_data->ssp_type) { + case QUARK_X1000_SSP: + return clk_div + | QUARK_X1000_SSCR0_Motorola + | QUARK_X1000_SSCR0_DataSize(bits > 32 ? 8 : bits) + | SSCR0_SSE; + default: + return clk_div + | SSCR0_Motorola + | SSCR0_DataSize(bits > 16 ? bits - 16 : bits) + | SSCR0_SSE + | (bits > 16 ? SSCR0_EDSS : 0); + } +} + +/* + * Read and write LPSS SSP private registers. Caller must first check that + * is_lpss_ssp() returns true before these can be called. + */ +static u32 __lpss_ssp_read_priv(struct driver_data *drv_data, unsigned offset) +{ + WARN_ON(!drv_data->lpss_base); + return readl(drv_data->lpss_base + offset); +} + +static void __lpss_ssp_write_priv(struct driver_data *drv_data, + unsigned offset, u32 value) +{ + WARN_ON(!drv_data->lpss_base); + writel(value, drv_data->lpss_base + offset); +} + +/* + * lpss_ssp_setup - perform LPSS SSP specific setup + * @drv_data: pointer to the driver private data + * + * Perform LPSS SSP specific setup. This function must be called first if + * one is going to use LPSS SSP private registers. + */ +static void lpss_ssp_setup(struct driver_data *drv_data) +{ + const struct lpss_config *config; + u32 value; + + config = lpss_get_config(drv_data); + drv_data->lpss_base = drv_data->ioaddr + config->offset; + + /* Enable software chip select control */ + value = __lpss_ssp_read_priv(drv_data, config->reg_cs_ctrl); + value &= ~(LPSS_CS_CONTROL_SW_MODE | LPSS_CS_CONTROL_CS_HIGH); + value |= LPSS_CS_CONTROL_SW_MODE | LPSS_CS_CONTROL_CS_HIGH; + __lpss_ssp_write_priv(drv_data, config->reg_cs_ctrl, value); + + /* Enable multiblock DMA transfers */ + if (drv_data->controller_info->enable_dma) { + __lpss_ssp_write_priv(drv_data, config->reg_ssp, 1); + + if (config->reg_general >= 0) { + value = __lpss_ssp_read_priv(drv_data, + config->reg_general); + value |= LPSS_GENERAL_REG_RXTO_HOLDOFF_DISABLE; + __lpss_ssp_write_priv(drv_data, + config->reg_general, value); + } + } +} + +static void lpss_ssp_select_cs(struct spi_device *spi, + const struct lpss_config *config) +{ + struct driver_data *drv_data = + spi_controller_get_devdata(spi->controller); + u32 value, cs; + + if (!config->cs_sel_mask) + return; + + value = __lpss_ssp_read_priv(drv_data, config->reg_cs_ctrl); + + cs = spi->chip_select; + cs <<= config->cs_sel_shift; + if (cs != (value & config->cs_sel_mask)) { + /* + * When switching another chip select output active the + * output must be selected first and wait 2 ssp_clk cycles + * before changing state to active. Otherwise a short + * glitch will occur on the previous chip select since + * output select is latched but state control is not. + */ + value &= ~config->cs_sel_mask; + value |= cs; + __lpss_ssp_write_priv(drv_data, + config->reg_cs_ctrl, value); + ndelay(1000000000 / + (drv_data->controller->max_speed_hz / 2)); + } +} + +static void lpss_ssp_cs_control(struct spi_device *spi, bool enable) +{ + struct driver_data *drv_data = + spi_controller_get_devdata(spi->controller); + const struct lpss_config *config; + u32 value; + + config = lpss_get_config(drv_data); + + if (enable) + lpss_ssp_select_cs(spi, config); + + value = __lpss_ssp_read_priv(drv_data, config->reg_cs_ctrl); + if (enable) + value &= ~LPSS_CS_CONTROL_CS_HIGH; + else + value |= LPSS_CS_CONTROL_CS_HIGH; + __lpss_ssp_write_priv(drv_data, config->reg_cs_ctrl, value); + if (config->cs_clk_stays_gated) { + u32 clkgate; + + /* + * Changing CS alone when dynamic clock gating is on won't + * actually flip CS at that time. This ruins SPI transfers + * that specify delays, or have no data. Toggle the clock mode + * to force on briefly to poke the CS pin to move. + */ + clkgate = __lpss_ssp_read_priv(drv_data, LPSS_PRIV_CLOCK_GATE); + value = (clkgate & ~LPSS_PRIV_CLOCK_GATE_CLK_CTL_MASK) | + LPSS_PRIV_CLOCK_GATE_CLK_CTL_FORCE_ON; + + __lpss_ssp_write_priv(drv_data, LPSS_PRIV_CLOCK_GATE, value); + __lpss_ssp_write_priv(drv_data, LPSS_PRIV_CLOCK_GATE, clkgate); + } +} + +static void cs_assert(struct spi_device *spi) +{ + struct chip_data *chip = spi_get_ctldata(spi); + struct driver_data *drv_data = + spi_controller_get_devdata(spi->controller); + + if (drv_data->ssp_type == CE4100_SSP) { + pxa2xx_spi_write(drv_data, SSSR, chip->frm); + return; + } + + if (chip->cs_control) { + chip->cs_control(PXA2XX_CS_ASSERT); + return; + } + + if (chip->gpiod_cs) { + gpiod_set_value(chip->gpiod_cs, chip->gpio_cs_inverted); + return; + } + + if (is_lpss_ssp(drv_data)) + lpss_ssp_cs_control(spi, true); +} + +static void cs_deassert(struct spi_device *spi) +{ + struct chip_data *chip = spi_get_ctldata(spi); + struct driver_data *drv_data = + spi_controller_get_devdata(spi->controller); + unsigned long timeout; + + if (drv_data->ssp_type == CE4100_SSP) + return; + + /* Wait until SSP becomes idle before deasserting the CS */ + timeout = jiffies + msecs_to_jiffies(10); + while (pxa2xx_spi_read(drv_data, SSSR) & SSSR_BSY && + !time_after(jiffies, timeout)) + cpu_relax(); + + if (chip->cs_control) { + chip->cs_control(PXA2XX_CS_DEASSERT); + return; + } + + if (chip->gpiod_cs) { + gpiod_set_value(chip->gpiod_cs, !chip->gpio_cs_inverted); + return; + } + + if (is_lpss_ssp(drv_data)) + lpss_ssp_cs_control(spi, false); +} + +static void pxa2xx_spi_set_cs(struct spi_device *spi, bool level) +{ + if (level) + cs_deassert(spi); + else + cs_assert(spi); +} + +int pxa2xx_spi_flush(struct driver_data *drv_data) +{ + unsigned long limit = loops_per_jiffy << 1; + + do { + while (pxa2xx_spi_read(drv_data, SSSR) & SSSR_RNE) + pxa2xx_spi_read(drv_data, SSDR); + } while ((pxa2xx_spi_read(drv_data, SSSR) & SSSR_BSY) && --limit); + write_SSSR_CS(drv_data, SSSR_ROR); + + return limit; +} + +static void pxa2xx_spi_off(struct driver_data *drv_data) +{ + /* On MMP, disabling SSE seems to corrupt the Rx FIFO */ + if (is_mmp2_ssp(drv_data)) + return; + + pxa2xx_spi_write(drv_data, SSCR0, + pxa2xx_spi_read(drv_data, SSCR0) & ~SSCR0_SSE); +} + +static int null_writer(struct driver_data *drv_data) +{ + u8 n_bytes = drv_data->n_bytes; + + if (pxa2xx_spi_txfifo_full(drv_data) + || (drv_data->tx == drv_data->tx_end)) + return 0; + + pxa2xx_spi_write(drv_data, SSDR, 0); + drv_data->tx += n_bytes; + + return 1; +} + +static int null_reader(struct driver_data *drv_data) +{ + u8 n_bytes = drv_data->n_bytes; + + while ((pxa2xx_spi_read(drv_data, SSSR) & SSSR_RNE) + && (drv_data->rx < drv_data->rx_end)) { + pxa2xx_spi_read(drv_data, SSDR); + drv_data->rx += n_bytes; + } + + return drv_data->rx == drv_data->rx_end; +} + +static int u8_writer(struct driver_data *drv_data) +{ + if (pxa2xx_spi_txfifo_full(drv_data) + || (drv_data->tx == drv_data->tx_end)) + return 0; + + pxa2xx_spi_write(drv_data, SSDR, *(u8 *)(drv_data->tx)); + ++drv_data->tx; + + return 1; +} + +static int u8_reader(struct driver_data *drv_data) +{ + while ((pxa2xx_spi_read(drv_data, SSSR) & SSSR_RNE) + && (drv_data->rx < drv_data->rx_end)) { + *(u8 *)(drv_data->rx) = pxa2xx_spi_read(drv_data, SSDR); + ++drv_data->rx; + } + + return drv_data->rx == drv_data->rx_end; +} + +static int u16_writer(struct driver_data *drv_data) +{ + if (pxa2xx_spi_txfifo_full(drv_data) + || (drv_data->tx == drv_data->tx_end)) + return 0; + + pxa2xx_spi_write(drv_data, SSDR, *(u16 *)(drv_data->tx)); + drv_data->tx += 2; + + return 1; +} + +static int u16_reader(struct driver_data *drv_data) +{ + while ((pxa2xx_spi_read(drv_data, SSSR) & SSSR_RNE) + && (drv_data->rx < drv_data->rx_end)) { + *(u16 *)(drv_data->rx) = pxa2xx_spi_read(drv_data, SSDR); + drv_data->rx += 2; + } + + return drv_data->rx == drv_data->rx_end; +} + +static int u32_writer(struct driver_data *drv_data) +{ + if (pxa2xx_spi_txfifo_full(drv_data) + || (drv_data->tx == drv_data->tx_end)) + return 0; + + pxa2xx_spi_write(drv_data, SSDR, *(u32 *)(drv_data->tx)); + drv_data->tx += 4; + + return 1; +} + +static int u32_reader(struct driver_data *drv_data) +{ + while ((pxa2xx_spi_read(drv_data, SSSR) & SSSR_RNE) + && (drv_data->rx < drv_data->rx_end)) { + *(u32 *)(drv_data->rx) = pxa2xx_spi_read(drv_data, SSDR); + drv_data->rx += 4; + } + + return drv_data->rx == drv_data->rx_end; +} + +static void reset_sccr1(struct driver_data *drv_data) +{ + struct chip_data *chip = + spi_get_ctldata(drv_data->controller->cur_msg->spi); + u32 sccr1_reg; + + sccr1_reg = pxa2xx_spi_read(drv_data, SSCR1) & ~drv_data->int_cr1; + switch (drv_data->ssp_type) { + case QUARK_X1000_SSP: + sccr1_reg &= ~QUARK_X1000_SSCR1_RFT; + break; + case CE4100_SSP: + sccr1_reg &= ~CE4100_SSCR1_RFT; + break; + default: + sccr1_reg &= ~SSCR1_RFT; + break; + } + sccr1_reg |= chip->threshold; + pxa2xx_spi_write(drv_data, SSCR1, sccr1_reg); +} + +static void int_error_stop(struct driver_data *drv_data, const char* msg) +{ + /* Stop and reset SSP */ + write_SSSR_CS(drv_data, drv_data->clear_sr); + reset_sccr1(drv_data); + if (!pxa25x_ssp_comp(drv_data)) + pxa2xx_spi_write(drv_data, SSTO, 0); + pxa2xx_spi_flush(drv_data); + pxa2xx_spi_off(drv_data); + + dev_err(&drv_data->pdev->dev, "%s\n", msg); + + drv_data->controller->cur_msg->status = -EIO; + spi_finalize_current_transfer(drv_data->controller); +} + +static void int_transfer_complete(struct driver_data *drv_data) +{ + /* Clear and disable interrupts */ + write_SSSR_CS(drv_data, drv_data->clear_sr); + reset_sccr1(drv_data); + if (!pxa25x_ssp_comp(drv_data)) + pxa2xx_spi_write(drv_data, SSTO, 0); + + spi_finalize_current_transfer(drv_data->controller); +} + +static irqreturn_t interrupt_transfer(struct driver_data *drv_data) +{ + u32 irq_mask = (pxa2xx_spi_read(drv_data, SSCR1) & SSCR1_TIE) ? + drv_data->mask_sr : drv_data->mask_sr & ~SSSR_TFS; + + u32 irq_status = pxa2xx_spi_read(drv_data, SSSR) & irq_mask; + + if (irq_status & SSSR_ROR) { + int_error_stop(drv_data, "interrupt_transfer: fifo overrun"); + return IRQ_HANDLED; + } + + if (irq_status & SSSR_TUR) { + int_error_stop(drv_data, "interrupt_transfer: fifo underrun"); + return IRQ_HANDLED; + } + + if (irq_status & SSSR_TINT) { + pxa2xx_spi_write(drv_data, SSSR, SSSR_TINT); + if (drv_data->read(drv_data)) { + int_transfer_complete(drv_data); + return IRQ_HANDLED; + } + } + + /* Drain rx fifo, Fill tx fifo and prevent overruns */ + do { + if (drv_data->read(drv_data)) { + int_transfer_complete(drv_data); + return IRQ_HANDLED; + } + } while (drv_data->write(drv_data)); + + if (drv_data->read(drv_data)) { + int_transfer_complete(drv_data); + return IRQ_HANDLED; + } + + if (drv_data->tx == drv_data->tx_end) { + u32 bytes_left; + u32 sccr1_reg; + + sccr1_reg = pxa2xx_spi_read(drv_data, SSCR1); + sccr1_reg &= ~SSCR1_TIE; + + /* + * PXA25x_SSP has no timeout, set up rx threshould for the + * remaining RX bytes. + */ + if (pxa25x_ssp_comp(drv_data)) { + u32 rx_thre; + + pxa2xx_spi_clear_rx_thre(drv_data, &sccr1_reg); + + bytes_left = drv_data->rx_end - drv_data->rx; + switch (drv_data->n_bytes) { + case 4: + bytes_left >>= 2; + break; + case 2: + bytes_left >>= 1; + break; + } + + rx_thre = pxa2xx_spi_get_rx_default_thre(drv_data); + if (rx_thre > bytes_left) + rx_thre = bytes_left; + + pxa2xx_spi_set_rx_thre(drv_data, &sccr1_reg, rx_thre); + } + pxa2xx_spi_write(drv_data, SSCR1, sccr1_reg); + } + + /* We did something */ + return IRQ_HANDLED; +} + +static void handle_bad_msg(struct driver_data *drv_data) +{ + pxa2xx_spi_off(drv_data); + pxa2xx_spi_write(drv_data, SSCR1, + pxa2xx_spi_read(drv_data, SSCR1) & ~drv_data->int_cr1); + if (!pxa25x_ssp_comp(drv_data)) + pxa2xx_spi_write(drv_data, SSTO, 0); + write_SSSR_CS(drv_data, drv_data->clear_sr); + + dev_err(&drv_data->pdev->dev, + "bad message state in interrupt handler\n"); +} + +static irqreturn_t ssp_int(int irq, void *dev_id) +{ + struct driver_data *drv_data = dev_id; + u32 sccr1_reg; + u32 mask = drv_data->mask_sr; + u32 status; + + /* + * The IRQ might be shared with other peripherals so we must first + * check that are we RPM suspended or not. If we are we assume that + * the IRQ was not for us (we shouldn't be RPM suspended when the + * interrupt is enabled). + */ + if (pm_runtime_suspended(&drv_data->pdev->dev)) + return IRQ_NONE; + + /* + * If the device is not yet in RPM suspended state and we get an + * interrupt that is meant for another device, check if status bits + * are all set to one. That means that the device is already + * powered off. + */ + status = pxa2xx_spi_read(drv_data, SSSR); + if (status == ~0) + return IRQ_NONE; + + sccr1_reg = pxa2xx_spi_read(drv_data, SSCR1); + + /* Ignore possible writes if we don't need to write */ + if (!(sccr1_reg & SSCR1_TIE)) + mask &= ~SSSR_TFS; + + /* Ignore RX timeout interrupt if it is disabled */ + if (!(sccr1_reg & SSCR1_TINTE)) + mask &= ~SSSR_TINT; + + if (!(status & mask)) + return IRQ_NONE; + + pxa2xx_spi_write(drv_data, SSCR1, sccr1_reg & ~drv_data->int_cr1); + pxa2xx_spi_write(drv_data, SSCR1, sccr1_reg); + + if (!drv_data->controller->cur_msg) { + handle_bad_msg(drv_data); + /* Never fail */ + return IRQ_HANDLED; + } + + return drv_data->transfer_handler(drv_data); +} + +/* + * The Quark SPI has an additional 24 bit register (DDS_CLK_RATE) to multiply + * input frequency by fractions of 2^24. It also has a divider by 5. + * + * There are formulas to get baud rate value for given input frequency and + * divider parameters, such as DDS_CLK_RATE and SCR: + * + * Fsys = 200MHz + * + * Fssp = Fsys * DDS_CLK_RATE / 2^24 (1) + * Baud rate = Fsclk = Fssp / (2 * (SCR + 1)) (2) + * + * DDS_CLK_RATE either 2^n or 2^n / 5. + * SCR is in range 0 .. 255 + * + * Divisor = 5^i * 2^j * 2 * k + * i = [0, 1] i = 1 iff j = 0 or j > 3 + * j = [0, 23] j = 0 iff i = 1 + * k = [1, 256] + * Special case: j = 0, i = 1: Divisor = 2 / 5 + * + * Accordingly to the specification the recommended values for DDS_CLK_RATE + * are: + * Case 1: 2^n, n = [0, 23] + * Case 2: 2^24 * 2 / 5 (0x666666) + * Case 3: less than or equal to 2^24 / 5 / 16 (0x33333) + * + * In all cases the lowest possible value is better. + * + * The function calculates parameters for all cases and chooses the one closest + * to the asked baud rate. + */ +static unsigned int quark_x1000_get_clk_div(int rate, u32 *dds) +{ + unsigned long xtal = 200000000; + unsigned long fref = xtal / 2; /* mandatory division by 2, + see (2) */ + /* case 3 */ + unsigned long fref1 = fref / 2; /* case 1 */ + unsigned long fref2 = fref * 2 / 5; /* case 2 */ + unsigned long scale; + unsigned long q, q1, q2; + long r, r1, r2; + u32 mul; + + /* Case 1 */ + + /* Set initial value for DDS_CLK_RATE */ + mul = (1 << 24) >> 1; + + /* Calculate initial quot */ + q1 = DIV_ROUND_UP(fref1, rate); + + /* Scale q1 if it's too big */ + if (q1 > 256) { + /* Scale q1 to range [1, 512] */ + scale = fls_long(q1 - 1); + if (scale > 9) { + q1 >>= scale - 9; + mul >>= scale - 9; + } + + /* Round the result if we have a remainder */ + q1 += q1 & 1; + } + + /* Decrease DDS_CLK_RATE as much as we can without loss in precision */ + scale = __ffs(q1); + q1 >>= scale; + mul >>= scale; + + /* Get the remainder */ + r1 = abs(fref1 / (1 << (24 - fls_long(mul))) / q1 - rate); + + /* Case 2 */ + + q2 = DIV_ROUND_UP(fref2, rate); + r2 = abs(fref2 / q2 - rate); + + /* + * Choose the best between two: less remainder we have the better. We + * can't go case 2 if q2 is greater than 256 since SCR register can + * hold only values 0 .. 255. + */ + if (r2 >= r1 || q2 > 256) { + /* case 1 is better */ + r = r1; + q = q1; + } else { + /* case 2 is better */ + r = r2; + q = q2; + mul = (1 << 24) * 2 / 5; + } + + /* Check case 3 only if the divisor is big enough */ + if (fref / rate >= 80) { + u64 fssp; + u32 m; + + /* Calculate initial quot */ + q1 = DIV_ROUND_UP(fref, rate); + m = (1 << 24) / q1; + + /* Get the remainder */ + fssp = (u64)fref * m; + do_div(fssp, 1 << 24); + r1 = abs(fssp - rate); + + /* Choose this one if it suits better */ + if (r1 < r) { + /* case 3 is better */ + q = 1; + mul = m; + } + } + + *dds = mul; + return q - 1; +} + +static unsigned int ssp_get_clk_div(struct driver_data *drv_data, int rate) +{ + unsigned long ssp_clk = drv_data->controller->max_speed_hz; + const struct ssp_device *ssp = drv_data->ssp; + + rate = min_t(int, ssp_clk, rate); + + /* + * Calculate the divisor for the SCR (Serial Clock Rate), avoiding + * that the SSP transmission rate can be greater than the device rate + */ + if (ssp->type == PXA25x_SSP || ssp->type == CE4100_SSP) + return (DIV_ROUND_UP(ssp_clk, 2 * rate) - 1) & 0xff; + else + return (DIV_ROUND_UP(ssp_clk, rate) - 1) & 0xfff; +} + +static unsigned int pxa2xx_ssp_get_clk_div(struct driver_data *drv_data, + int rate) +{ + struct chip_data *chip = + spi_get_ctldata(drv_data->controller->cur_msg->spi); + unsigned int clk_div; + + switch (drv_data->ssp_type) { + case QUARK_X1000_SSP: + clk_div = quark_x1000_get_clk_div(rate, &chip->dds_rate); + break; + default: + clk_div = ssp_get_clk_div(drv_data, rate); + break; + } + return clk_div << 8; +} + +static bool pxa2xx_spi_can_dma(struct spi_controller *controller, + struct spi_device *spi, + struct spi_transfer *xfer) +{ + struct chip_data *chip = spi_get_ctldata(spi); + + return chip->enable_dma && + xfer->len <= MAX_DMA_LEN && + xfer->len >= chip->dma_burst_size; +} + +static int pxa2xx_spi_transfer_one(struct spi_controller *controller, + struct spi_device *spi, + struct spi_transfer *transfer) +{ + struct driver_data *drv_data = spi_controller_get_devdata(controller); + struct spi_message *message = controller->cur_msg; + struct chip_data *chip = spi_get_ctldata(spi); + u32 dma_thresh = chip->dma_threshold; + u32 dma_burst = chip->dma_burst_size; + u32 change_mask = pxa2xx_spi_get_ssrc1_change_mask(drv_data); + u32 clk_div; + u8 bits; + u32 speed; + u32 cr0; + u32 cr1; + int err; + int dma_mapped; + + /* Check if we can DMA this transfer */ + if (transfer->len > MAX_DMA_LEN && chip->enable_dma) { + + /* reject already-mapped transfers; PIO won't always work */ + if (message->is_dma_mapped + || transfer->rx_dma || transfer->tx_dma) { + dev_err(&spi->dev, + "Mapped transfer length of %u is greater than %d\n", + transfer->len, MAX_DMA_LEN); + return -EINVAL; + } + + /* warn ... we force this to PIO mode */ + dev_warn_ratelimited(&spi->dev, + "DMA disabled for transfer length %ld greater than %d\n", + (long)transfer->len, MAX_DMA_LEN); + } + + /* Setup the transfer state based on the type of transfer */ + if (pxa2xx_spi_flush(drv_data) == 0) { + dev_err(&spi->dev, "Flush failed\n"); + return -EIO; + } + drv_data->n_bytes = chip->n_bytes; + drv_data->tx = (void *)transfer->tx_buf; + drv_data->tx_end = drv_data->tx + transfer->len; + drv_data->rx = transfer->rx_buf; + drv_data->rx_end = drv_data->rx + transfer->len; + drv_data->write = drv_data->tx ? chip->write : null_writer; + drv_data->read = drv_data->rx ? chip->read : null_reader; + + /* Change speed and bit per word on a per transfer */ + bits = transfer->bits_per_word; + speed = transfer->speed_hz; + + clk_div = pxa2xx_ssp_get_clk_div(drv_data, speed); + + if (bits <= 8) { + drv_data->n_bytes = 1; + drv_data->read = drv_data->read != null_reader ? + u8_reader : null_reader; + drv_data->write = drv_data->write != null_writer ? + u8_writer : null_writer; + } else if (bits <= 16) { + drv_data->n_bytes = 2; + drv_data->read = drv_data->read != null_reader ? + u16_reader : null_reader; + drv_data->write = drv_data->write != null_writer ? + u16_writer : null_writer; + } else if (bits <= 32) { + drv_data->n_bytes = 4; + drv_data->read = drv_data->read != null_reader ? + u32_reader : null_reader; + drv_data->write = drv_data->write != null_writer ? + u32_writer : null_writer; + } + /* + * if bits/word is changed in dma mode, then must check the + * thresholds and burst also + */ + if (chip->enable_dma) { + if (pxa2xx_spi_set_dma_burst_and_threshold(chip, + spi, + bits, &dma_burst, + &dma_thresh)) + dev_warn_ratelimited(&spi->dev, + "DMA burst size reduced to match bits_per_word\n"); + } + + dma_mapped = controller->can_dma && + controller->can_dma(controller, spi, transfer) && + controller->cur_msg_mapped; + if (dma_mapped) { + + /* Ensure we have the correct interrupt handler */ + drv_data->transfer_handler = pxa2xx_spi_dma_transfer; + + err = pxa2xx_spi_dma_prepare(drv_data, transfer); + if (err) + return err; + + /* Clear status and start DMA engine */ + cr1 = chip->cr1 | dma_thresh | drv_data->dma_cr1; + pxa2xx_spi_write(drv_data, SSSR, drv_data->clear_sr); + + pxa2xx_spi_dma_start(drv_data); + } else { + /* Ensure we have the correct interrupt handler */ + drv_data->transfer_handler = interrupt_transfer; + + /* Clear status */ + cr1 = chip->cr1 | chip->threshold | drv_data->int_cr1; + write_SSSR_CS(drv_data, drv_data->clear_sr); + } + + /* NOTE: PXA25x_SSP _could_ use external clocking ... */ + cr0 = pxa2xx_configure_sscr0(drv_data, clk_div, bits); + if (!pxa25x_ssp_comp(drv_data)) + dev_dbg(&spi->dev, "%u Hz actual, %s\n", + controller->max_speed_hz + / (1 + ((cr0 & SSCR0_SCR(0xfff)) >> 8)), + dma_mapped ? "DMA" : "PIO"); + else + dev_dbg(&spi->dev, "%u Hz actual, %s\n", + controller->max_speed_hz / 2 + / (1 + ((cr0 & SSCR0_SCR(0x0ff)) >> 8)), + dma_mapped ? "DMA" : "PIO"); + + if (is_lpss_ssp(drv_data)) { + if ((pxa2xx_spi_read(drv_data, SSIRF) & 0xff) + != chip->lpss_rx_threshold) + pxa2xx_spi_write(drv_data, SSIRF, + chip->lpss_rx_threshold); + if ((pxa2xx_spi_read(drv_data, SSITF) & 0xffff) + != chip->lpss_tx_threshold) + pxa2xx_spi_write(drv_data, SSITF, + chip->lpss_tx_threshold); + } + + if (is_quark_x1000_ssp(drv_data) && + (pxa2xx_spi_read(drv_data, DDS_RATE) != chip->dds_rate)) + pxa2xx_spi_write(drv_data, DDS_RATE, chip->dds_rate); + + /* see if we need to reload the config registers */ + if ((pxa2xx_spi_read(drv_data, SSCR0) != cr0) + || (pxa2xx_spi_read(drv_data, SSCR1) & change_mask) + != (cr1 & change_mask)) { + /* stop the SSP, and update the other bits */ + if (!is_mmp2_ssp(drv_data)) + pxa2xx_spi_write(drv_data, SSCR0, cr0 & ~SSCR0_SSE); + if (!pxa25x_ssp_comp(drv_data)) + pxa2xx_spi_write(drv_data, SSTO, chip->timeout); + /* first set CR1 without interrupt and service enables */ + pxa2xx_spi_write(drv_data, SSCR1, cr1 & change_mask); + /* restart the SSP */ + pxa2xx_spi_write(drv_data, SSCR0, cr0); + + } else { + if (!pxa25x_ssp_comp(drv_data)) + pxa2xx_spi_write(drv_data, SSTO, chip->timeout); + } + + if (is_mmp2_ssp(drv_data)) { + u8 tx_level = (pxa2xx_spi_read(drv_data, SSSR) + & SSSR_TFL_MASK) >> 8; + + if (tx_level) { + /* On MMP2, flipping SSE doesn't to empty TXFIFO. */ + dev_warn(&spi->dev, "%d bytes of garbage in TXFIFO!\n", + tx_level); + if (tx_level > transfer->len) + tx_level = transfer->len; + drv_data->tx += tx_level; + } + } + + if (spi_controller_is_slave(controller)) { + while (drv_data->write(drv_data)) + ; + if (drv_data->gpiod_ready) { + gpiod_set_value(drv_data->gpiod_ready, 1); + udelay(1); + gpiod_set_value(drv_data->gpiod_ready, 0); + } + } + + /* + * Release the data by enabling service requests and interrupts, + * without changing any mode bits + */ + pxa2xx_spi_write(drv_data, SSCR1, cr1); + + return 1; +} + +static int pxa2xx_spi_slave_abort(struct spi_controller *controller) +{ + struct driver_data *drv_data = spi_controller_get_devdata(controller); + + /* Stop and reset SSP */ + write_SSSR_CS(drv_data, drv_data->clear_sr); + reset_sccr1(drv_data); + if (!pxa25x_ssp_comp(drv_data)) + pxa2xx_spi_write(drv_data, SSTO, 0); + pxa2xx_spi_flush(drv_data); + pxa2xx_spi_off(drv_data); + + dev_dbg(&drv_data->pdev->dev, "transfer aborted\n"); + + drv_data->controller->cur_msg->status = -EINTR; + spi_finalize_current_transfer(drv_data->controller); + + return 0; +} + +static void pxa2xx_spi_handle_err(struct spi_controller *controller, + struct spi_message *msg) +{ + struct driver_data *drv_data = spi_controller_get_devdata(controller); + + /* Disable the SSP */ + pxa2xx_spi_off(drv_data); + /* Clear and disable interrupts and service requests */ + write_SSSR_CS(drv_data, drv_data->clear_sr); + pxa2xx_spi_write(drv_data, SSCR1, + pxa2xx_spi_read(drv_data, SSCR1) + & ~(drv_data->int_cr1 | drv_data->dma_cr1)); + if (!pxa25x_ssp_comp(drv_data)) + pxa2xx_spi_write(drv_data, SSTO, 0); + + /* + * Stop the DMA if running. Note DMA callback handler may have unset + * the dma_running already, which is fine as stopping is not needed + * then but we shouldn't rely this flag for anything else than + * stopping. For instance to differentiate between PIO and DMA + * transfers. + */ + if (atomic_read(&drv_data->dma_running)) + pxa2xx_spi_dma_stop(drv_data); +} + +static int pxa2xx_spi_unprepare_transfer(struct spi_controller *controller) +{ + struct driver_data *drv_data = spi_controller_get_devdata(controller); + + /* Disable the SSP now */ + pxa2xx_spi_off(drv_data); + + return 0; +} + +static int setup_cs(struct spi_device *spi, struct chip_data *chip, + struct pxa2xx_spi_chip *chip_info) +{ + struct driver_data *drv_data = + spi_controller_get_devdata(spi->controller); + struct gpio_desc *gpiod; + int err = 0; + + if (chip == NULL) + return 0; + + if (drv_data->cs_gpiods) { + gpiod = drv_data->cs_gpiods[spi->chip_select]; + if (gpiod) { + chip->gpiod_cs = gpiod; + chip->gpio_cs_inverted = spi->mode & SPI_CS_HIGH; + gpiod_set_value(gpiod, chip->gpio_cs_inverted); + } + + return 0; + } + + if (chip_info == NULL) + return 0; + + /* NOTE: setup() can be called multiple times, possibly with + * different chip_info, release previously requested GPIO + */ + if (chip->gpiod_cs) { + gpiod_put(chip->gpiod_cs); + chip->gpiod_cs = NULL; + } + + /* If (*cs_control) is provided, ignore GPIO chip select */ + if (chip_info->cs_control) { + chip->cs_control = chip_info->cs_control; + return 0; + } + + if (gpio_is_valid(chip_info->gpio_cs)) { + err = gpio_request(chip_info->gpio_cs, "SPI_CS"); + if (err) { + dev_err(&spi->dev, "failed to request chip select GPIO%d\n", + chip_info->gpio_cs); + return err; + } + + gpiod = gpio_to_desc(chip_info->gpio_cs); + chip->gpiod_cs = gpiod; + chip->gpio_cs_inverted = spi->mode & SPI_CS_HIGH; + + err = gpiod_direction_output(gpiod, !chip->gpio_cs_inverted); + if (err) + gpiod_put(chip->gpiod_cs); + } + + return err; +} + +static int setup(struct spi_device *spi) +{ + struct pxa2xx_spi_chip *chip_info; + struct chip_data *chip; + const struct lpss_config *config; + struct driver_data *drv_data = + spi_controller_get_devdata(spi->controller); + uint tx_thres, tx_hi_thres, rx_thres; + int err; + + switch (drv_data->ssp_type) { + case QUARK_X1000_SSP: + tx_thres = TX_THRESH_QUARK_X1000_DFLT; + tx_hi_thres = 0; + rx_thres = RX_THRESH_QUARK_X1000_DFLT; + break; + case CE4100_SSP: + tx_thres = TX_THRESH_CE4100_DFLT; + tx_hi_thres = 0; + rx_thres = RX_THRESH_CE4100_DFLT; + break; + case LPSS_LPT_SSP: + case LPSS_BYT_SSP: + case LPSS_BSW_SSP: + case LPSS_SPT_SSP: + case LPSS_BXT_SSP: + case LPSS_CNL_SSP: + config = lpss_get_config(drv_data); + tx_thres = config->tx_threshold_lo; + tx_hi_thres = config->tx_threshold_hi; + rx_thres = config->rx_threshold; + break; + default: + tx_hi_thres = 0; + if (spi_controller_is_slave(drv_data->controller)) { + tx_thres = 1; + rx_thres = 2; + } else { + tx_thres = TX_THRESH_DFLT; + rx_thres = RX_THRESH_DFLT; + } + break; + } + + /* Only alloc on first setup */ + chip = spi_get_ctldata(spi); + if (!chip) { + chip = kzalloc(sizeof(struct chip_data), GFP_KERNEL); + if (!chip) + return -ENOMEM; + + if (drv_data->ssp_type == CE4100_SSP) { + if (spi->chip_select > 4) { + dev_err(&spi->dev, + "failed setup: cs number must not be > 4.\n"); + kfree(chip); + return -EINVAL; + } + + chip->frm = spi->chip_select; + } + chip->enable_dma = drv_data->controller_info->enable_dma; + chip->timeout = TIMOUT_DFLT; + } + + /* protocol drivers may change the chip settings, so... + * if chip_info exists, use it */ + chip_info = spi->controller_data; + + /* chip_info isn't always needed */ + chip->cr1 = 0; + if (chip_info) { + if (chip_info->timeout) + chip->timeout = chip_info->timeout; + if (chip_info->tx_threshold) + tx_thres = chip_info->tx_threshold; + if (chip_info->tx_hi_threshold) + tx_hi_thres = chip_info->tx_hi_threshold; + if (chip_info->rx_threshold) + rx_thres = chip_info->rx_threshold; + chip->dma_threshold = 0; + if (chip_info->enable_loopback) + chip->cr1 = SSCR1_LBM; + } + if (spi_controller_is_slave(drv_data->controller)) { + chip->cr1 |= SSCR1_SCFR; + chip->cr1 |= SSCR1_SCLKDIR; + chip->cr1 |= SSCR1_SFRMDIR; + chip->cr1 |= SSCR1_SPH; + } + + chip->lpss_rx_threshold = SSIRF_RxThresh(rx_thres); + chip->lpss_tx_threshold = SSITF_TxLoThresh(tx_thres) + | SSITF_TxHiThresh(tx_hi_thres); + + /* set dma burst and threshold outside of chip_info path so that if + * chip_info goes away after setting chip->enable_dma, the + * burst and threshold can still respond to changes in bits_per_word */ + if (chip->enable_dma) { + /* set up legal burst and threshold for dma */ + if (pxa2xx_spi_set_dma_burst_and_threshold(chip, spi, + spi->bits_per_word, + &chip->dma_burst_size, + &chip->dma_threshold)) { + dev_warn(&spi->dev, + "in setup: DMA burst size reduced to match bits_per_word\n"); + } + dev_dbg(&spi->dev, + "in setup: DMA burst size set to %u\n", + chip->dma_burst_size); + } + + switch (drv_data->ssp_type) { + case QUARK_X1000_SSP: + chip->threshold = (QUARK_X1000_SSCR1_RxTresh(rx_thres) + & QUARK_X1000_SSCR1_RFT) + | (QUARK_X1000_SSCR1_TxTresh(tx_thres) + & QUARK_X1000_SSCR1_TFT); + break; + case CE4100_SSP: + chip->threshold = (CE4100_SSCR1_RxTresh(rx_thres) & CE4100_SSCR1_RFT) | + (CE4100_SSCR1_TxTresh(tx_thres) & CE4100_SSCR1_TFT); + break; + default: + chip->threshold = (SSCR1_RxTresh(rx_thres) & SSCR1_RFT) | + (SSCR1_TxTresh(tx_thres) & SSCR1_TFT); + break; + } + + chip->cr1 &= ~(SSCR1_SPO | SSCR1_SPH); + chip->cr1 |= (((spi->mode & SPI_CPHA) != 0) ? SSCR1_SPH : 0) + | (((spi->mode & SPI_CPOL) != 0) ? SSCR1_SPO : 0); + + if (spi->mode & SPI_LOOP) + chip->cr1 |= SSCR1_LBM; + + if (spi->bits_per_word <= 8) { + chip->n_bytes = 1; + chip->read = u8_reader; + chip->write = u8_writer; + } else if (spi->bits_per_word <= 16) { + chip->n_bytes = 2; + chip->read = u16_reader; + chip->write = u16_writer; + } else if (spi->bits_per_word <= 32) { + chip->n_bytes = 4; + chip->read = u32_reader; + chip->write = u32_writer; + } + + spi_set_ctldata(spi, chip); + + if (drv_data->ssp_type == CE4100_SSP) + return 0; + + err = setup_cs(spi, chip, chip_info); + if (err) + kfree(chip); + + return err; +} + +static void cleanup(struct spi_device *spi) +{ + struct chip_data *chip = spi_get_ctldata(spi); + struct driver_data *drv_data = + spi_controller_get_devdata(spi->controller); + + if (!chip) + return; + + if (drv_data->ssp_type != CE4100_SSP && !drv_data->cs_gpiods && + chip->gpiod_cs) + gpiod_put(chip->gpiod_cs); + + kfree(chip); +} + +#ifdef CONFIG_ACPI +static const struct acpi_device_id pxa2xx_spi_acpi_match[] = { + { "INT33C0", LPSS_LPT_SSP }, + { "INT33C1", LPSS_LPT_SSP }, + { "INT3430", LPSS_LPT_SSP }, + { "INT3431", LPSS_LPT_SSP }, + { "80860F0E", LPSS_BYT_SSP }, + { "8086228E", LPSS_BSW_SSP }, + { }, +}; +MODULE_DEVICE_TABLE(acpi, pxa2xx_spi_acpi_match); +#endif + +/* + * PCI IDs of compound devices that integrate both host controller and private + * integrated DMA engine. Please note these are not used in module + * autoloading and probing in this module but matching the LPSS SSP type. + */ +static const struct pci_device_id pxa2xx_spi_pci_compound_match[] = { + /* SPT-LP */ + { PCI_VDEVICE(INTEL, 0x9d29), LPSS_SPT_SSP }, + { PCI_VDEVICE(INTEL, 0x9d2a), LPSS_SPT_SSP }, + /* SPT-H */ + { PCI_VDEVICE(INTEL, 0xa129), LPSS_SPT_SSP }, + { PCI_VDEVICE(INTEL, 0xa12a), LPSS_SPT_SSP }, + /* KBL-H */ + { PCI_VDEVICE(INTEL, 0xa2a9), LPSS_SPT_SSP }, + { PCI_VDEVICE(INTEL, 0xa2aa), LPSS_SPT_SSP }, + /* CML-V */ + { PCI_VDEVICE(INTEL, 0xa3a9), LPSS_SPT_SSP }, + { PCI_VDEVICE(INTEL, 0xa3aa), LPSS_SPT_SSP }, + /* BXT A-Step */ + { PCI_VDEVICE(INTEL, 0x0ac2), LPSS_BXT_SSP }, + { PCI_VDEVICE(INTEL, 0x0ac4), LPSS_BXT_SSP }, + { PCI_VDEVICE(INTEL, 0x0ac6), LPSS_BXT_SSP }, + /* BXT B-Step */ + { PCI_VDEVICE(INTEL, 0x1ac2), LPSS_BXT_SSP }, + { PCI_VDEVICE(INTEL, 0x1ac4), LPSS_BXT_SSP }, + { PCI_VDEVICE(INTEL, 0x1ac6), LPSS_BXT_SSP }, + /* GLK */ + { PCI_VDEVICE(INTEL, 0x31c2), LPSS_BXT_SSP }, + { PCI_VDEVICE(INTEL, 0x31c4), LPSS_BXT_SSP }, + { PCI_VDEVICE(INTEL, 0x31c6), LPSS_BXT_SSP }, + /* ICL-LP */ + { PCI_VDEVICE(INTEL, 0x34aa), LPSS_CNL_SSP }, + { PCI_VDEVICE(INTEL, 0x34ab), LPSS_CNL_SSP }, + { PCI_VDEVICE(INTEL, 0x34fb), LPSS_CNL_SSP }, + /* EHL */ + { PCI_VDEVICE(INTEL, 0x4b2a), LPSS_BXT_SSP }, + { PCI_VDEVICE(INTEL, 0x4b2b), LPSS_BXT_SSP }, + { PCI_VDEVICE(INTEL, 0x4b37), LPSS_BXT_SSP }, + /* JSL */ + { PCI_VDEVICE(INTEL, 0x4daa), LPSS_CNL_SSP }, + { PCI_VDEVICE(INTEL, 0x4dab), LPSS_CNL_SSP }, + { PCI_VDEVICE(INTEL, 0x4dfb), LPSS_CNL_SSP }, + /* TGL-H */ + { PCI_VDEVICE(INTEL, 0x43aa), LPSS_CNL_SSP }, + { PCI_VDEVICE(INTEL, 0x43ab), LPSS_CNL_SSP }, + { PCI_VDEVICE(INTEL, 0x43fb), LPSS_CNL_SSP }, + { PCI_VDEVICE(INTEL, 0x43fd), LPSS_CNL_SSP }, + /* APL */ + { PCI_VDEVICE(INTEL, 0x5ac2), LPSS_BXT_SSP }, + { PCI_VDEVICE(INTEL, 0x5ac4), LPSS_BXT_SSP }, + { PCI_VDEVICE(INTEL, 0x5ac6), LPSS_BXT_SSP }, + /* CNL-LP */ + { PCI_VDEVICE(INTEL, 0x9daa), LPSS_CNL_SSP }, + { PCI_VDEVICE(INTEL, 0x9dab), LPSS_CNL_SSP }, + { PCI_VDEVICE(INTEL, 0x9dfb), LPSS_CNL_SSP }, + /* CNL-H */ + { PCI_VDEVICE(INTEL, 0xa32a), LPSS_CNL_SSP }, + { PCI_VDEVICE(INTEL, 0xa32b), LPSS_CNL_SSP }, + { PCI_VDEVICE(INTEL, 0xa37b), LPSS_CNL_SSP }, + /* CML-LP */ + { PCI_VDEVICE(INTEL, 0x02aa), LPSS_CNL_SSP }, + { PCI_VDEVICE(INTEL, 0x02ab), LPSS_CNL_SSP }, + { PCI_VDEVICE(INTEL, 0x02fb), LPSS_CNL_SSP }, + /* CML-H */ + { PCI_VDEVICE(INTEL, 0x06aa), LPSS_CNL_SSP }, + { PCI_VDEVICE(INTEL, 0x06ab), LPSS_CNL_SSP }, + { PCI_VDEVICE(INTEL, 0x06fb), LPSS_CNL_SSP }, + /* TGL-LP */ + { PCI_VDEVICE(INTEL, 0xa0aa), LPSS_CNL_SSP }, + { PCI_VDEVICE(INTEL, 0xa0ab), LPSS_CNL_SSP }, + { PCI_VDEVICE(INTEL, 0xa0de), LPSS_CNL_SSP }, + { PCI_VDEVICE(INTEL, 0xa0df), LPSS_CNL_SSP }, + { PCI_VDEVICE(INTEL, 0xa0fb), LPSS_CNL_SSP }, + { PCI_VDEVICE(INTEL, 0xa0fd), LPSS_CNL_SSP }, + { PCI_VDEVICE(INTEL, 0xa0fe), LPSS_CNL_SSP }, + { }, +}; + +static const struct of_device_id pxa2xx_spi_of_match[] = { + { .compatible = "marvell,mmp2-ssp", .data = (void *)MMP2_SSP }, + {}, +}; +MODULE_DEVICE_TABLE(of, pxa2xx_spi_of_match); + +#ifdef CONFIG_ACPI + +static int pxa2xx_spi_get_port_id(struct device *dev) +{ + struct acpi_device *adev; + unsigned int devid; + int port_id = -1; + + adev = ACPI_COMPANION(dev); + if (adev && adev->pnp.unique_id && + !kstrtouint(adev->pnp.unique_id, 0, &devid)) + port_id = devid; + return port_id; +} + +#else /* !CONFIG_ACPI */ + +static int pxa2xx_spi_get_port_id(struct device *dev) +{ + return -1; +} + +#endif /* CONFIG_ACPI */ + + +#ifdef CONFIG_PCI + +static bool pxa2xx_spi_idma_filter(struct dma_chan *chan, void *param) +{ + return param == chan->device->dev; +} + +#endif /* CONFIG_PCI */ + +static struct pxa2xx_spi_controller * +pxa2xx_spi_init_pdata(struct platform_device *pdev) +{ + struct pxa2xx_spi_controller *pdata; + struct ssp_device *ssp; + struct resource *res; + struct device *parent = pdev->dev.parent; + struct pci_dev *pcidev = dev_is_pci(parent) ? to_pci_dev(parent) : NULL; + const struct pci_device_id *pcidev_id = NULL; + enum pxa_ssp_type type; + const void *match; + + if (pcidev) + pcidev_id = pci_match_id(pxa2xx_spi_pci_compound_match, pcidev); + + match = device_get_match_data(&pdev->dev); + if (match) + type = (enum pxa_ssp_type)match; + else if (pcidev_id) + type = (enum pxa_ssp_type)pcidev_id->driver_data; + else + return ERR_PTR(-EINVAL); + + pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL); + if (!pdata) + return ERR_PTR(-ENOMEM); + + ssp = &pdata->ssp; + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + ssp->mmio_base = devm_ioremap_resource(&pdev->dev, res); + if (IS_ERR(ssp->mmio_base)) + return ERR_CAST(ssp->mmio_base); + + ssp->phys_base = res->start; + +#ifdef CONFIG_PCI + if (pcidev_id) { + pdata->tx_param = parent; + pdata->rx_param = parent; + pdata->dma_filter = pxa2xx_spi_idma_filter; + } +#endif + + ssp->clk = devm_clk_get(&pdev->dev, NULL); + if (IS_ERR(ssp->clk)) + return ERR_CAST(ssp->clk); + + ssp->irq = platform_get_irq(pdev, 0); + if (ssp->irq < 0) + return ERR_PTR(ssp->irq); + + ssp->type = type; + ssp->dev = &pdev->dev; + ssp->port_id = pxa2xx_spi_get_port_id(&pdev->dev); + + pdata->is_slave = device_property_read_bool(&pdev->dev, "spi-slave"); + pdata->num_chipselect = 1; + pdata->enable_dma = true; + pdata->dma_burst_size = 1; + + return pdata; +} + +static int pxa2xx_spi_fw_translate_cs(struct spi_controller *controller, + unsigned int cs) +{ + struct driver_data *drv_data = spi_controller_get_devdata(controller); + + if (has_acpi_companion(&drv_data->pdev->dev)) { + switch (drv_data->ssp_type) { + /* + * For Atoms the ACPI DeviceSelection used by the Windows + * driver starts from 1 instead of 0 so translate it here + * to match what Linux expects. + */ + case LPSS_BYT_SSP: + case LPSS_BSW_SSP: + return cs - 1; + + default: + break; + } + } + + return cs; +} + +static size_t pxa2xx_spi_max_dma_transfer_size(struct spi_device *spi) +{ + return MAX_DMA_LEN; +} + +static int pxa2xx_spi_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct pxa2xx_spi_controller *platform_info; + struct spi_controller *controller; + struct driver_data *drv_data; + struct ssp_device *ssp; + const struct lpss_config *config; + int status, count; + u32 tmp; + + platform_info = dev_get_platdata(dev); + if (!platform_info) { + platform_info = pxa2xx_spi_init_pdata(pdev); + if (IS_ERR(platform_info)) { + dev_err(&pdev->dev, "missing platform data\n"); + return PTR_ERR(platform_info); + } + } + + ssp = pxa_ssp_request(pdev->id, pdev->name); + if (!ssp) + ssp = &platform_info->ssp; + + if (!ssp->mmio_base) { + dev_err(&pdev->dev, "failed to get ssp\n"); + return -ENODEV; + } + + if (platform_info->is_slave) + controller = devm_spi_alloc_slave(dev, sizeof(*drv_data)); + else + controller = devm_spi_alloc_master(dev, sizeof(*drv_data)); + + if (!controller) { + dev_err(&pdev->dev, "cannot alloc spi_controller\n"); + pxa_ssp_free(ssp); + return -ENOMEM; + } + drv_data = spi_controller_get_devdata(controller); + drv_data->controller = controller; + drv_data->controller_info = platform_info; + drv_data->pdev = pdev; + drv_data->ssp = ssp; + + controller->dev.of_node = pdev->dev.of_node; + /* the spi->mode bits understood by this driver: */ + controller->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH | SPI_LOOP; + + controller->bus_num = ssp->port_id; + controller->dma_alignment = DMA_ALIGNMENT; + controller->cleanup = cleanup; + controller->setup = setup; + controller->set_cs = pxa2xx_spi_set_cs; + controller->transfer_one = pxa2xx_spi_transfer_one; + controller->slave_abort = pxa2xx_spi_slave_abort; + controller->handle_err = pxa2xx_spi_handle_err; + controller->unprepare_transfer_hardware = pxa2xx_spi_unprepare_transfer; + controller->fw_translate_cs = pxa2xx_spi_fw_translate_cs; + controller->auto_runtime_pm = true; + controller->flags = SPI_CONTROLLER_MUST_RX | SPI_CONTROLLER_MUST_TX; + + drv_data->ssp_type = ssp->type; + + drv_data->ioaddr = ssp->mmio_base; + drv_data->ssdr_physical = ssp->phys_base + SSDR; + if (pxa25x_ssp_comp(drv_data)) { + switch (drv_data->ssp_type) { + case QUARK_X1000_SSP: + controller->bits_per_word_mask = SPI_BPW_RANGE_MASK(4, 32); + break; + default: + controller->bits_per_word_mask = SPI_BPW_RANGE_MASK(4, 16); + break; + } + + drv_data->int_cr1 = SSCR1_TIE | SSCR1_RIE; + drv_data->dma_cr1 = 0; + drv_data->clear_sr = SSSR_ROR; + drv_data->mask_sr = SSSR_RFS | SSSR_TFS | SSSR_ROR; + } else { + controller->bits_per_word_mask = SPI_BPW_RANGE_MASK(4, 32); + drv_data->int_cr1 = SSCR1_TIE | SSCR1_RIE | SSCR1_TINTE; + drv_data->dma_cr1 = DEFAULT_DMA_CR1; + drv_data->clear_sr = SSSR_ROR | SSSR_TINT; + drv_data->mask_sr = SSSR_TINT | SSSR_RFS | SSSR_TFS + | SSSR_ROR | SSSR_TUR; + } + + status = request_irq(ssp->irq, ssp_int, IRQF_SHARED, dev_name(dev), + drv_data); + if (status < 0) { + dev_err(&pdev->dev, "cannot get IRQ %d\n", ssp->irq); + goto out_error_controller_alloc; + } + + /* Setup DMA if requested */ + if (platform_info->enable_dma) { + status = pxa2xx_spi_dma_setup(drv_data); + if (status) { + dev_warn(dev, "no DMA channels available, using PIO\n"); + platform_info->enable_dma = false; + } else { + controller->can_dma = pxa2xx_spi_can_dma; + controller->max_dma_len = MAX_DMA_LEN; + controller->max_transfer_size = + pxa2xx_spi_max_dma_transfer_size; + } + } + + /* Enable SOC clock */ + status = clk_prepare_enable(ssp->clk); + if (status) + goto out_error_dma_irq_alloc; + + controller->max_speed_hz = clk_get_rate(ssp->clk); + /* + * Set minimum speed for all other platforms than Intel Quark which is + * able do under 1 Hz transfers. + */ + if (!pxa25x_ssp_comp(drv_data)) + controller->min_speed_hz = + DIV_ROUND_UP(controller->max_speed_hz, 4096); + else if (!is_quark_x1000_ssp(drv_data)) + controller->min_speed_hz = + DIV_ROUND_UP(controller->max_speed_hz, 512); + + /* Load default SSP configuration */ + pxa2xx_spi_write(drv_data, SSCR0, 0); + switch (drv_data->ssp_type) { + case QUARK_X1000_SSP: + tmp = QUARK_X1000_SSCR1_RxTresh(RX_THRESH_QUARK_X1000_DFLT) | + QUARK_X1000_SSCR1_TxTresh(TX_THRESH_QUARK_X1000_DFLT); + pxa2xx_spi_write(drv_data, SSCR1, tmp); + + /* using the Motorola SPI protocol and use 8 bit frame */ + tmp = QUARK_X1000_SSCR0_Motorola | QUARK_X1000_SSCR0_DataSize(8); + pxa2xx_spi_write(drv_data, SSCR0, tmp); + break; + case CE4100_SSP: + tmp = CE4100_SSCR1_RxTresh(RX_THRESH_CE4100_DFLT) | + CE4100_SSCR1_TxTresh(TX_THRESH_CE4100_DFLT); + pxa2xx_spi_write(drv_data, SSCR1, tmp); + tmp = SSCR0_SCR(2) | SSCR0_Motorola | SSCR0_DataSize(8); + pxa2xx_spi_write(drv_data, SSCR0, tmp); + break; + default: + + if (spi_controller_is_slave(controller)) { + tmp = SSCR1_SCFR | + SSCR1_SCLKDIR | + SSCR1_SFRMDIR | + SSCR1_RxTresh(2) | + SSCR1_TxTresh(1) | + SSCR1_SPH; + } else { + tmp = SSCR1_RxTresh(RX_THRESH_DFLT) | + SSCR1_TxTresh(TX_THRESH_DFLT); + } + pxa2xx_spi_write(drv_data, SSCR1, tmp); + tmp = SSCR0_Motorola | SSCR0_DataSize(8); + if (!spi_controller_is_slave(controller)) + tmp |= SSCR0_SCR(2); + pxa2xx_spi_write(drv_data, SSCR0, tmp); + break; + } + + if (!pxa25x_ssp_comp(drv_data)) + pxa2xx_spi_write(drv_data, SSTO, 0); + + if (!is_quark_x1000_ssp(drv_data)) + pxa2xx_spi_write(drv_data, SSPSP, 0); + + if (is_lpss_ssp(drv_data)) { + lpss_ssp_setup(drv_data); + config = lpss_get_config(drv_data); + if (config->reg_capabilities >= 0) { + tmp = __lpss_ssp_read_priv(drv_data, + config->reg_capabilities); + tmp &= LPSS_CAPS_CS_EN_MASK; + tmp >>= LPSS_CAPS_CS_EN_SHIFT; + platform_info->num_chipselect = ffz(tmp); + } else if (config->cs_num) { + platform_info->num_chipselect = config->cs_num; + } + } + controller->num_chipselect = platform_info->num_chipselect; + + count = gpiod_count(&pdev->dev, "cs"); + if (count > 0) { + int i; + + controller->num_chipselect = max_t(int, count, + controller->num_chipselect); + + drv_data->cs_gpiods = devm_kcalloc(&pdev->dev, + controller->num_chipselect, sizeof(struct gpio_desc *), + GFP_KERNEL); + if (!drv_data->cs_gpiods) { + status = -ENOMEM; + goto out_error_clock_enabled; + } + + for (i = 0; i < controller->num_chipselect; i++) { + struct gpio_desc *gpiod; + + gpiod = devm_gpiod_get_index(dev, "cs", i, GPIOD_ASIS); + if (IS_ERR(gpiod)) { + /* Means use native chip select */ + if (PTR_ERR(gpiod) == -ENOENT) + continue; + + status = PTR_ERR(gpiod); + goto out_error_clock_enabled; + } else { + drv_data->cs_gpiods[i] = gpiod; + } + } + } + + if (platform_info->is_slave) { + drv_data->gpiod_ready = devm_gpiod_get_optional(dev, + "ready", GPIOD_OUT_LOW); + if (IS_ERR(drv_data->gpiod_ready)) { + status = PTR_ERR(drv_data->gpiod_ready); + goto out_error_clock_enabled; + } + } + + pm_runtime_set_autosuspend_delay(&pdev->dev, 50); + pm_runtime_use_autosuspend(&pdev->dev); + pm_runtime_set_active(&pdev->dev); + pm_runtime_enable(&pdev->dev); + + /* Register with the SPI framework */ + platform_set_drvdata(pdev, drv_data); + status = spi_register_controller(controller); + if (status != 0) { + dev_err(&pdev->dev, "problem registering spi controller\n"); + goto out_error_pm_runtime_enabled; + } + + return status; + +out_error_pm_runtime_enabled: + pm_runtime_disable(&pdev->dev); + +out_error_clock_enabled: + clk_disable_unprepare(ssp->clk); + +out_error_dma_irq_alloc: + pxa2xx_spi_dma_release(drv_data); + free_irq(ssp->irq, drv_data); + +out_error_controller_alloc: + pxa_ssp_free(ssp); + return status; +} + +static int pxa2xx_spi_remove(struct platform_device *pdev) +{ + struct driver_data *drv_data = platform_get_drvdata(pdev); + struct ssp_device *ssp = drv_data->ssp; + + pm_runtime_get_sync(&pdev->dev); + + spi_unregister_controller(drv_data->controller); + + /* Disable the SSP at the peripheral and SOC level */ + pxa2xx_spi_write(drv_data, SSCR0, 0); + clk_disable_unprepare(ssp->clk); + + /* Release DMA */ + if (drv_data->controller_info->enable_dma) + pxa2xx_spi_dma_release(drv_data); + + pm_runtime_put_noidle(&pdev->dev); + pm_runtime_disable(&pdev->dev); + + /* Release IRQ */ + free_irq(ssp->irq, drv_data); + + /* Release SSP */ + pxa_ssp_free(ssp); + + return 0; +} + +#ifdef CONFIG_PM_SLEEP +static int pxa2xx_spi_suspend(struct device *dev) +{ + struct driver_data *drv_data = dev_get_drvdata(dev); + struct ssp_device *ssp = drv_data->ssp; + int status; + + status = spi_controller_suspend(drv_data->controller); + if (status != 0) + return status; + pxa2xx_spi_write(drv_data, SSCR0, 0); + + if (!pm_runtime_suspended(dev)) + clk_disable_unprepare(ssp->clk); + + return 0; +} + +static int pxa2xx_spi_resume(struct device *dev) +{ + struct driver_data *drv_data = dev_get_drvdata(dev); + struct ssp_device *ssp = drv_data->ssp; + int status; + + /* Enable the SSP clock */ + if (!pm_runtime_suspended(dev)) { + status = clk_prepare_enable(ssp->clk); + if (status) + return status; + } + + /* Start the queue running */ + return spi_controller_resume(drv_data->controller); +} +#endif + +#ifdef CONFIG_PM +static int pxa2xx_spi_runtime_suspend(struct device *dev) +{ + struct driver_data *drv_data = dev_get_drvdata(dev); + + clk_disable_unprepare(drv_data->ssp->clk); + return 0; +} + +static int pxa2xx_spi_runtime_resume(struct device *dev) +{ + struct driver_data *drv_data = dev_get_drvdata(dev); + int status; + + status = clk_prepare_enable(drv_data->ssp->clk); + return status; +} +#endif + +static const struct dev_pm_ops pxa2xx_spi_pm_ops = { + SET_SYSTEM_SLEEP_PM_OPS(pxa2xx_spi_suspend, pxa2xx_spi_resume) + SET_RUNTIME_PM_OPS(pxa2xx_spi_runtime_suspend, + pxa2xx_spi_runtime_resume, NULL) +}; + +static struct platform_driver driver = { + .driver = { + .name = "pxa2xx-spi", + .pm = &pxa2xx_spi_pm_ops, + .acpi_match_table = ACPI_PTR(pxa2xx_spi_acpi_match), + .of_match_table = of_match_ptr(pxa2xx_spi_of_match), + }, + .probe = pxa2xx_spi_probe, + .remove = pxa2xx_spi_remove, +}; + +static int __init pxa2xx_spi_init(void) +{ + return platform_driver_register(&driver); +} +subsys_initcall(pxa2xx_spi_init); + +static void __exit pxa2xx_spi_exit(void) +{ + platform_driver_unregister(&driver); +} +module_exit(pxa2xx_spi_exit); + +MODULE_SOFTDEP("pre: dw_dmac"); diff --git a/drivers/spi/spi-pxa2xx.h b/drivers/spi/spi-pxa2xx.h new file mode 100644 index 000000000..1400472bc --- /dev/null +++ b/drivers/spi/spi-pxa2xx.h @@ -0,0 +1,143 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* + * Copyright (C) 2005 Stephen Street / StreetFire Sound Labs + * Copyright (C) 2013, Intel Corporation + */ + +#ifndef SPI_PXA2XX_H +#define SPI_PXA2XX_H + +#include <linux/atomic.h> +#include <linux/dmaengine.h> +#include <linux/errno.h> +#include <linux/io.h> +#include <linux/interrupt.h> +#include <linux/platform_device.h> +#include <linux/pxa2xx_ssp.h> +#include <linux/scatterlist.h> +#include <linux/sizes.h> +#include <linux/spi/spi.h> +#include <linux/spi/pxa2xx_spi.h> + +struct driver_data { + /* Driver model hookup */ + struct platform_device *pdev; + + /* SSP Info */ + struct ssp_device *ssp; + + /* SPI framework hookup */ + enum pxa_ssp_type ssp_type; + struct spi_controller *controller; + + /* PXA hookup */ + struct pxa2xx_spi_controller *controller_info; + + /* SSP register addresses */ + void __iomem *ioaddr; + phys_addr_t ssdr_physical; + + /* SSP masks*/ + u32 dma_cr1; + u32 int_cr1; + u32 clear_sr; + u32 mask_sr; + + /* DMA engine support */ + atomic_t dma_running; + + /* Current transfer state info */ + void *tx; + void *tx_end; + void *rx; + void *rx_end; + u8 n_bytes; + int (*write)(struct driver_data *drv_data); + int (*read)(struct driver_data *drv_data); + irqreturn_t (*transfer_handler)(struct driver_data *drv_data); + void (*cs_control)(u32 command); + + void __iomem *lpss_base; + + /* GPIOs for chip selects */ + struct gpio_desc **cs_gpiods; + + /* Optional slave FIFO ready signal */ + struct gpio_desc *gpiod_ready; +}; + +struct chip_data { + u32 cr1; + u32 dds_rate; + u32 timeout; + u8 n_bytes; + u32 dma_burst_size; + u32 threshold; + u32 dma_threshold; + u16 lpss_rx_threshold; + u16 lpss_tx_threshold; + u8 enable_dma; + union { + struct gpio_desc *gpiod_cs; + unsigned int frm; + }; + int gpio_cs_inverted; + int (*write)(struct driver_data *drv_data); + int (*read)(struct driver_data *drv_data); + void (*cs_control)(u32 command); +}; + +static inline u32 pxa2xx_spi_read(const struct driver_data *drv_data, + unsigned reg) +{ + return __raw_readl(drv_data->ioaddr + reg); +} + +static inline void pxa2xx_spi_write(const struct driver_data *drv_data, + unsigned reg, u32 val) +{ + __raw_writel(val, drv_data->ioaddr + reg); +} + +#define DMA_ALIGNMENT 8 + +static inline int pxa25x_ssp_comp(struct driver_data *drv_data) +{ + switch (drv_data->ssp_type) { + case PXA25x_SSP: + case CE4100_SSP: + case QUARK_X1000_SSP: + return 1; + default: + return 0; + } +} + +static inline void write_SSSR_CS(struct driver_data *drv_data, u32 val) +{ + if (drv_data->ssp_type == CE4100_SSP || + drv_data->ssp_type == QUARK_X1000_SSP) + val |= pxa2xx_spi_read(drv_data, SSSR) & SSSR_ALT_FRM_MASK; + + pxa2xx_spi_write(drv_data, SSSR, val); +} + +extern int pxa2xx_spi_flush(struct driver_data *drv_data); + +#define MAX_DMA_LEN SZ_64K +#define DEFAULT_DMA_CR1 (SSCR1_TSRE | SSCR1_RSRE | SSCR1_TRAIL) + +extern irqreturn_t pxa2xx_spi_dma_transfer(struct driver_data *drv_data); +extern int pxa2xx_spi_dma_prepare(struct driver_data *drv_data, + struct spi_transfer *xfer); +extern void pxa2xx_spi_dma_start(struct driver_data *drv_data); +extern void pxa2xx_spi_dma_stop(struct driver_data *drv_data); +extern int pxa2xx_spi_dma_setup(struct driver_data *drv_data); +extern void pxa2xx_spi_dma_release(struct driver_data *drv_data); +extern int pxa2xx_spi_set_dma_burst_and_threshold(struct chip_data *chip, + struct spi_device *spi, + u8 bits_per_word, + u32 *burst_code, + u32 *threshold); + +#endif /* SPI_PXA2XX_H */ diff --git a/drivers/spi/spi-qcom-qspi.c b/drivers/spi/spi-qcom-qspi.c new file mode 100644 index 000000000..8863be370 --- /dev/null +++ b/drivers/spi/spi-qcom-qspi.c @@ -0,0 +1,672 @@ +// SPDX-License-Identifier: GPL-2.0 +// Copyright (c) 2017-2018, The Linux foundation. All rights reserved. + +#include <linux/clk.h> +#include <linux/interconnect.h> +#include <linux/interrupt.h> +#include <linux/io.h> +#include <linux/module.h> +#include <linux/of.h> +#include <linux/of_platform.h> +#include <linux/pm_runtime.h> +#include <linux/pm_opp.h> +#include <linux/spi/spi.h> +#include <linux/spi/spi-mem.h> + + +#define QSPI_NUM_CS 2 +#define QSPI_BYTES_PER_WORD 4 + +#define MSTR_CONFIG 0x0000 +#define FULL_CYCLE_MODE BIT(3) +#define FB_CLK_EN BIT(4) +#define PIN_HOLDN BIT(6) +#define PIN_WPN BIT(7) +#define DMA_ENABLE BIT(8) +#define BIG_ENDIAN_MODE BIT(9) +#define SPI_MODE_MSK 0xc00 +#define SPI_MODE_SHFT 10 +#define CHIP_SELECT_NUM BIT(12) +#define SBL_EN BIT(13) +#define LPA_BASE_MSK 0x3c000 +#define LPA_BASE_SHFT 14 +#define TX_DATA_DELAY_MSK 0xc0000 +#define TX_DATA_DELAY_SHFT 18 +#define TX_CLK_DELAY_MSK 0x300000 +#define TX_CLK_DELAY_SHFT 20 +#define TX_CS_N_DELAY_MSK 0xc00000 +#define TX_CS_N_DELAY_SHFT 22 +#define TX_DATA_OE_DELAY_MSK 0x3000000 +#define TX_DATA_OE_DELAY_SHFT 24 + +#define AHB_MASTER_CFG 0x0004 +#define HMEM_TYPE_START_MID_TRANS_MSK 0x7 +#define HMEM_TYPE_START_MID_TRANS_SHFT 0 +#define HMEM_TYPE_LAST_TRANS_MSK 0x38 +#define HMEM_TYPE_LAST_TRANS_SHFT 3 +#define USE_HMEMTYPE_LAST_ON_DESC_OR_CHAIN_MSK 0xc0 +#define USE_HMEMTYPE_LAST_ON_DESC_OR_CHAIN_SHFT 6 +#define HMEMTYPE_READ_TRANS_MSK 0x700 +#define HMEMTYPE_READ_TRANS_SHFT 8 +#define HSHARED BIT(11) +#define HINNERSHARED BIT(12) + +#define MSTR_INT_EN 0x000C +#define MSTR_INT_STATUS 0x0010 +#define RESP_FIFO_UNDERRUN BIT(0) +#define RESP_FIFO_NOT_EMPTY BIT(1) +#define RESP_FIFO_RDY BIT(2) +#define HRESP_FROM_NOC_ERR BIT(3) +#define WR_FIFO_EMPTY BIT(9) +#define WR_FIFO_FULL BIT(10) +#define WR_FIFO_OVERRUN BIT(11) +#define TRANSACTION_DONE BIT(16) +#define QSPI_ERR_IRQS (RESP_FIFO_UNDERRUN | HRESP_FROM_NOC_ERR | \ + WR_FIFO_OVERRUN) +#define QSPI_ALL_IRQS (QSPI_ERR_IRQS | RESP_FIFO_RDY | \ + WR_FIFO_EMPTY | WR_FIFO_FULL | \ + TRANSACTION_DONE) + +#define PIO_XFER_CTRL 0x0014 +#define REQUEST_COUNT_MSK 0xffff + +#define PIO_XFER_CFG 0x0018 +#define TRANSFER_DIRECTION BIT(0) +#define MULTI_IO_MODE_MSK 0xe +#define MULTI_IO_MODE_SHFT 1 +#define TRANSFER_FRAGMENT BIT(8) +#define SDR_1BIT 1 +#define SDR_2BIT 2 +#define SDR_4BIT 3 +#define DDR_1BIT 5 +#define DDR_2BIT 6 +#define DDR_4BIT 7 +#define DMA_DESC_SINGLE_SPI 1 +#define DMA_DESC_DUAL_SPI 2 +#define DMA_DESC_QUAD_SPI 3 + +#define PIO_XFER_STATUS 0x001c +#define WR_FIFO_BYTES_MSK 0xffff0000 +#define WR_FIFO_BYTES_SHFT 16 + +#define PIO_DATAOUT_1B 0x0020 +#define PIO_DATAOUT_4B 0x0024 + +#define RD_FIFO_CFG 0x0028 +#define CONTINUOUS_MODE BIT(0) + +#define RD_FIFO_STATUS 0x002c +#define FIFO_EMPTY BIT(11) +#define WR_CNTS_MSK 0x7f0 +#define WR_CNTS_SHFT 4 +#define RDY_64BYTE BIT(3) +#define RDY_32BYTE BIT(2) +#define RDY_16BYTE BIT(1) +#define FIFO_RDY BIT(0) + +#define RD_FIFO_RESET 0x0030 +#define RESET_FIFO BIT(0) + +#define CUR_MEM_ADDR 0x0048 +#define HW_VERSION 0x004c +#define RD_FIFO 0x0050 +#define SAMPLING_CLK_CFG 0x0090 +#define SAMPLING_CLK_STATUS 0x0094 + + +enum qspi_dir { + QSPI_READ, + QSPI_WRITE, +}; + +struct qspi_xfer { + union { + const void *tx_buf; + void *rx_buf; + }; + unsigned int rem_bytes; + unsigned int buswidth; + enum qspi_dir dir; + bool is_last; +}; + +enum qspi_clocks { + QSPI_CLK_CORE, + QSPI_CLK_IFACE, + QSPI_NUM_CLKS +}; + +struct qcom_qspi { + void __iomem *base; + struct device *dev; + struct clk_bulk_data *clks; + struct qspi_xfer xfer; + struct icc_path *icc_path_cpu_to_qspi; + struct opp_table *opp_table; + unsigned long last_speed; + /* Lock to protect data accessed by IRQs */ + spinlock_t lock; +}; + +static u32 qspi_buswidth_to_iomode(struct qcom_qspi *ctrl, + unsigned int buswidth) +{ + switch (buswidth) { + case 1: + return SDR_1BIT << MULTI_IO_MODE_SHFT; + case 2: + return SDR_2BIT << MULTI_IO_MODE_SHFT; + case 4: + return SDR_4BIT << MULTI_IO_MODE_SHFT; + default: + dev_warn_once(ctrl->dev, + "Unexpected bus width: %u\n", buswidth); + return SDR_1BIT << MULTI_IO_MODE_SHFT; + } +} + +static void qcom_qspi_pio_xfer_cfg(struct qcom_qspi *ctrl) +{ + u32 pio_xfer_cfg; + const struct qspi_xfer *xfer; + + xfer = &ctrl->xfer; + pio_xfer_cfg = readl(ctrl->base + PIO_XFER_CFG); + pio_xfer_cfg &= ~TRANSFER_DIRECTION; + pio_xfer_cfg |= xfer->dir; + if (xfer->is_last) + pio_xfer_cfg &= ~TRANSFER_FRAGMENT; + else + pio_xfer_cfg |= TRANSFER_FRAGMENT; + pio_xfer_cfg &= ~MULTI_IO_MODE_MSK; + pio_xfer_cfg |= qspi_buswidth_to_iomode(ctrl, xfer->buswidth); + + writel(pio_xfer_cfg, ctrl->base + PIO_XFER_CFG); +} + +static void qcom_qspi_pio_xfer_ctrl(struct qcom_qspi *ctrl) +{ + u32 pio_xfer_ctrl; + + pio_xfer_ctrl = readl(ctrl->base + PIO_XFER_CTRL); + pio_xfer_ctrl &= ~REQUEST_COUNT_MSK; + pio_xfer_ctrl |= ctrl->xfer.rem_bytes; + writel(pio_xfer_ctrl, ctrl->base + PIO_XFER_CTRL); +} + +static void qcom_qspi_pio_xfer(struct qcom_qspi *ctrl) +{ + u32 ints; + + qcom_qspi_pio_xfer_cfg(ctrl); + + /* Ack any previous interrupts that might be hanging around */ + writel(QSPI_ALL_IRQS, ctrl->base + MSTR_INT_STATUS); + + /* Setup new interrupts */ + if (ctrl->xfer.dir == QSPI_WRITE) + ints = QSPI_ERR_IRQS | WR_FIFO_EMPTY; + else + ints = QSPI_ERR_IRQS | RESP_FIFO_RDY; + writel(ints, ctrl->base + MSTR_INT_EN); + + /* Kick off the transfer */ + qcom_qspi_pio_xfer_ctrl(ctrl); +} + +static void qcom_qspi_handle_err(struct spi_master *master, + struct spi_message *msg) +{ + struct qcom_qspi *ctrl = spi_master_get_devdata(master); + unsigned long flags; + + spin_lock_irqsave(&ctrl->lock, flags); + writel(0, ctrl->base + MSTR_INT_EN); + ctrl->xfer.rem_bytes = 0; + spin_unlock_irqrestore(&ctrl->lock, flags); +} + +static int qcom_qspi_set_speed(struct qcom_qspi *ctrl, unsigned long speed_hz) +{ + int ret; + unsigned int avg_bw_cpu; + + if (speed_hz == ctrl->last_speed) + return 0; + + /* In regular operation (SBL_EN=1) core must be 4x transfer clock */ + ret = dev_pm_opp_set_rate(ctrl->dev, speed_hz * 4); + if (ret) { + dev_err(ctrl->dev, "Failed to set core clk %d\n", ret); + return ret; + } + + /* + * Set BW quota for CPU as driver supports FIFO mode only. + * We don't have explicit peak requirement so keep it equal to avg_bw. + */ + avg_bw_cpu = Bps_to_icc(speed_hz); + ret = icc_set_bw(ctrl->icc_path_cpu_to_qspi, avg_bw_cpu, avg_bw_cpu); + if (ret) { + dev_err(ctrl->dev, "%s: ICC BW voting failed for cpu: %d\n", + __func__, ret); + return ret; + } + + ctrl->last_speed = speed_hz; + + return 0; +} + +static int qcom_qspi_transfer_one(struct spi_master *master, + struct spi_device *slv, + struct spi_transfer *xfer) +{ + struct qcom_qspi *ctrl = spi_master_get_devdata(master); + int ret; + unsigned long speed_hz; + unsigned long flags; + + speed_hz = slv->max_speed_hz; + if (xfer->speed_hz) + speed_hz = xfer->speed_hz; + + ret = qcom_qspi_set_speed(ctrl, speed_hz); + if (ret) + return ret; + + spin_lock_irqsave(&ctrl->lock, flags); + + /* We are half duplex, so either rx or tx will be set */ + if (xfer->rx_buf) { + ctrl->xfer.dir = QSPI_READ; + ctrl->xfer.buswidth = xfer->rx_nbits; + ctrl->xfer.rx_buf = xfer->rx_buf; + } else { + ctrl->xfer.dir = QSPI_WRITE; + ctrl->xfer.buswidth = xfer->tx_nbits; + ctrl->xfer.tx_buf = xfer->tx_buf; + } + ctrl->xfer.is_last = list_is_last(&xfer->transfer_list, + &master->cur_msg->transfers); + ctrl->xfer.rem_bytes = xfer->len; + qcom_qspi_pio_xfer(ctrl); + + spin_unlock_irqrestore(&ctrl->lock, flags); + + /* We'll call spi_finalize_current_transfer() when done */ + return 1; +} + +static int qcom_qspi_prepare_message(struct spi_master *master, + struct spi_message *message) +{ + u32 mstr_cfg; + struct qcom_qspi *ctrl; + int tx_data_oe_delay = 1; + int tx_data_delay = 1; + unsigned long flags; + + ctrl = spi_master_get_devdata(master); + spin_lock_irqsave(&ctrl->lock, flags); + + mstr_cfg = readl(ctrl->base + MSTR_CONFIG); + mstr_cfg &= ~CHIP_SELECT_NUM; + if (message->spi->chip_select) + mstr_cfg |= CHIP_SELECT_NUM; + + mstr_cfg |= FB_CLK_EN | PIN_WPN | PIN_HOLDN | SBL_EN | FULL_CYCLE_MODE; + mstr_cfg &= ~(SPI_MODE_MSK | TX_DATA_OE_DELAY_MSK | TX_DATA_DELAY_MSK); + mstr_cfg |= message->spi->mode << SPI_MODE_SHFT; + mstr_cfg |= tx_data_oe_delay << TX_DATA_OE_DELAY_SHFT; + mstr_cfg |= tx_data_delay << TX_DATA_DELAY_SHFT; + mstr_cfg &= ~DMA_ENABLE; + + writel(mstr_cfg, ctrl->base + MSTR_CONFIG); + spin_unlock_irqrestore(&ctrl->lock, flags); + + return 0; +} + +static irqreturn_t pio_read(struct qcom_qspi *ctrl) +{ + u32 rd_fifo_status; + u32 rd_fifo; + unsigned int wr_cnts; + unsigned int bytes_to_read; + unsigned int words_to_read; + u32 *word_buf; + u8 *byte_buf; + int i; + + rd_fifo_status = readl(ctrl->base + RD_FIFO_STATUS); + + if (!(rd_fifo_status & FIFO_RDY)) { + dev_dbg(ctrl->dev, "Spurious IRQ %#x\n", rd_fifo_status); + return IRQ_NONE; + } + + wr_cnts = (rd_fifo_status & WR_CNTS_MSK) >> WR_CNTS_SHFT; + wr_cnts = min(wr_cnts, ctrl->xfer.rem_bytes); + + words_to_read = wr_cnts / QSPI_BYTES_PER_WORD; + bytes_to_read = wr_cnts % QSPI_BYTES_PER_WORD; + + if (words_to_read) { + word_buf = ctrl->xfer.rx_buf; + ctrl->xfer.rem_bytes -= words_to_read * QSPI_BYTES_PER_WORD; + ioread32_rep(ctrl->base + RD_FIFO, word_buf, words_to_read); + ctrl->xfer.rx_buf = word_buf + words_to_read; + } + + if (bytes_to_read) { + byte_buf = ctrl->xfer.rx_buf; + rd_fifo = readl(ctrl->base + RD_FIFO); + ctrl->xfer.rem_bytes -= bytes_to_read; + for (i = 0; i < bytes_to_read; i++) + *byte_buf++ = rd_fifo >> (i * BITS_PER_BYTE); + ctrl->xfer.rx_buf = byte_buf; + } + + return IRQ_HANDLED; +} + +static irqreturn_t pio_write(struct qcom_qspi *ctrl) +{ + const void *xfer_buf = ctrl->xfer.tx_buf; + const int *word_buf; + const char *byte_buf; + unsigned int wr_fifo_bytes; + unsigned int wr_fifo_words; + unsigned int wr_size; + unsigned int rem_words; + + wr_fifo_bytes = readl(ctrl->base + PIO_XFER_STATUS); + wr_fifo_bytes >>= WR_FIFO_BYTES_SHFT; + + if (ctrl->xfer.rem_bytes < QSPI_BYTES_PER_WORD) { + /* Process the last 1-3 bytes */ + wr_size = min(wr_fifo_bytes, ctrl->xfer.rem_bytes); + ctrl->xfer.rem_bytes -= wr_size; + + byte_buf = xfer_buf; + while (wr_size--) + writel(*byte_buf++, + ctrl->base + PIO_DATAOUT_1B); + ctrl->xfer.tx_buf = byte_buf; + } else { + /* + * Process all the whole words; to keep things simple we'll + * just wait for the next interrupt to handle the last 1-3 + * bytes if we don't have an even number of words. + */ + rem_words = ctrl->xfer.rem_bytes / QSPI_BYTES_PER_WORD; + wr_fifo_words = wr_fifo_bytes / QSPI_BYTES_PER_WORD; + + wr_size = min(rem_words, wr_fifo_words); + ctrl->xfer.rem_bytes -= wr_size * QSPI_BYTES_PER_WORD; + + word_buf = xfer_buf; + iowrite32_rep(ctrl->base + PIO_DATAOUT_4B, word_buf, wr_size); + ctrl->xfer.tx_buf = word_buf + wr_size; + + } + + return IRQ_HANDLED; +} + +static irqreturn_t qcom_qspi_irq(int irq, void *dev_id) +{ + u32 int_status; + struct qcom_qspi *ctrl = dev_id; + irqreturn_t ret = IRQ_NONE; + + spin_lock(&ctrl->lock); + + int_status = readl(ctrl->base + MSTR_INT_STATUS); + writel(int_status, ctrl->base + MSTR_INT_STATUS); + + if (ctrl->xfer.dir == QSPI_WRITE) { + if (int_status & WR_FIFO_EMPTY) + ret = pio_write(ctrl); + } else { + if (int_status & RESP_FIFO_RDY) + ret = pio_read(ctrl); + } + + if (int_status & QSPI_ERR_IRQS) { + if (int_status & RESP_FIFO_UNDERRUN) + dev_err(ctrl->dev, "IRQ error: FIFO underrun\n"); + if (int_status & WR_FIFO_OVERRUN) + dev_err(ctrl->dev, "IRQ error: FIFO overrun\n"); + if (int_status & HRESP_FROM_NOC_ERR) + dev_err(ctrl->dev, "IRQ error: NOC response error\n"); + ret = IRQ_HANDLED; + } + + if (!ctrl->xfer.rem_bytes) { + writel(0, ctrl->base + MSTR_INT_EN); + spi_finalize_current_transfer(dev_get_drvdata(ctrl->dev)); + } + + spin_unlock(&ctrl->lock); + return ret; +} + +static int qcom_qspi_probe(struct platform_device *pdev) +{ + int ret; + struct device *dev; + struct spi_master *master; + struct qcom_qspi *ctrl; + + dev = &pdev->dev; + + master = devm_spi_alloc_master(dev, sizeof(*ctrl)); + if (!master) + return -ENOMEM; + + platform_set_drvdata(pdev, master); + + ctrl = spi_master_get_devdata(master); + + spin_lock_init(&ctrl->lock); + ctrl->dev = dev; + ctrl->base = devm_platform_ioremap_resource(pdev, 0); + if (IS_ERR(ctrl->base)) + return PTR_ERR(ctrl->base); + + ctrl->clks = devm_kcalloc(dev, QSPI_NUM_CLKS, + sizeof(*ctrl->clks), GFP_KERNEL); + if (!ctrl->clks) + return -ENOMEM; + + ctrl->clks[QSPI_CLK_CORE].id = "core"; + ctrl->clks[QSPI_CLK_IFACE].id = "iface"; + ret = devm_clk_bulk_get(dev, QSPI_NUM_CLKS, ctrl->clks); + if (ret) + return ret; + + ctrl->icc_path_cpu_to_qspi = devm_of_icc_get(dev, "qspi-config"); + if (IS_ERR(ctrl->icc_path_cpu_to_qspi)) + return dev_err_probe(dev, PTR_ERR(ctrl->icc_path_cpu_to_qspi), + "Failed to get cpu path\n"); + + /* Set BW vote for register access */ + ret = icc_set_bw(ctrl->icc_path_cpu_to_qspi, Bps_to_icc(1000), + Bps_to_icc(1000)); + if (ret) { + dev_err(ctrl->dev, "%s: ICC BW voting failed for cpu: %d\n", + __func__, ret); + return ret; + } + + ret = icc_disable(ctrl->icc_path_cpu_to_qspi); + if (ret) { + dev_err(ctrl->dev, "%s: ICC disable failed for cpu: %d\n", + __func__, ret); + return ret; + } + + ret = platform_get_irq(pdev, 0); + if (ret < 0) + return ret; + ret = devm_request_irq(dev, ret, qcom_qspi_irq, + IRQF_TRIGGER_HIGH, dev_name(dev), ctrl); + if (ret) { + dev_err(dev, "Failed to request irq %d\n", ret); + return ret; + } + + master->max_speed_hz = 300000000; + master->num_chipselect = QSPI_NUM_CS; + master->bus_num = -1; + master->dev.of_node = pdev->dev.of_node; + master->mode_bits = SPI_MODE_0 | + SPI_TX_DUAL | SPI_RX_DUAL | + SPI_TX_QUAD | SPI_RX_QUAD; + master->flags = SPI_MASTER_HALF_DUPLEX; + master->prepare_message = qcom_qspi_prepare_message; + master->transfer_one = qcom_qspi_transfer_one; + master->handle_err = qcom_qspi_handle_err; + master->auto_runtime_pm = true; + + ctrl->opp_table = dev_pm_opp_set_clkname(&pdev->dev, "core"); + if (IS_ERR(ctrl->opp_table)) + return PTR_ERR(ctrl->opp_table); + /* OPP table is optional */ + ret = dev_pm_opp_of_add_table(&pdev->dev); + if (ret && ret != -ENODEV) { + dev_err(&pdev->dev, "invalid OPP table in device tree\n"); + goto exit_probe_put_clkname; + } + + pm_runtime_use_autosuspend(dev); + pm_runtime_set_autosuspend_delay(dev, 250); + pm_runtime_enable(dev); + + ret = spi_register_master(master); + if (!ret) + return 0; + + pm_runtime_disable(dev); + dev_pm_opp_of_remove_table(&pdev->dev); + +exit_probe_put_clkname: + dev_pm_opp_put_clkname(ctrl->opp_table); + + return ret; +} + +static int qcom_qspi_remove(struct platform_device *pdev) +{ + struct spi_master *master = platform_get_drvdata(pdev); + struct qcom_qspi *ctrl = spi_master_get_devdata(master); + + /* Unregister _before_ disabling pm_runtime() so we stop transfers */ + spi_unregister_master(master); + + pm_runtime_disable(&pdev->dev); + dev_pm_opp_of_remove_table(&pdev->dev); + dev_pm_opp_put_clkname(ctrl->opp_table); + + return 0; +} + +static int __maybe_unused qcom_qspi_runtime_suspend(struct device *dev) +{ + struct spi_master *master = dev_get_drvdata(dev); + struct qcom_qspi *ctrl = spi_master_get_devdata(master); + int ret; + + /* Drop the performance state vote */ + dev_pm_opp_set_rate(dev, 0); + clk_bulk_disable_unprepare(QSPI_NUM_CLKS, ctrl->clks); + + ret = icc_disable(ctrl->icc_path_cpu_to_qspi); + if (ret) { + dev_err_ratelimited(ctrl->dev, "%s: ICC disable failed for cpu: %d\n", + __func__, ret); + return ret; + } + + return 0; +} + +static int __maybe_unused qcom_qspi_runtime_resume(struct device *dev) +{ + struct spi_master *master = dev_get_drvdata(dev); + struct qcom_qspi *ctrl = spi_master_get_devdata(master); + int ret; + + ret = icc_enable(ctrl->icc_path_cpu_to_qspi); + if (ret) { + dev_err_ratelimited(ctrl->dev, "%s: ICC enable failed for cpu: %d\n", + __func__, ret); + return ret; + } + + ret = clk_bulk_prepare_enable(QSPI_NUM_CLKS, ctrl->clks); + if (ret) + return ret; + + return dev_pm_opp_set_rate(dev, ctrl->last_speed * 4); +} + +static int __maybe_unused qcom_qspi_suspend(struct device *dev) +{ + struct spi_master *master = dev_get_drvdata(dev); + int ret; + + ret = spi_master_suspend(master); + if (ret) + return ret; + + ret = pm_runtime_force_suspend(dev); + if (ret) + spi_master_resume(master); + + return ret; +} + +static int __maybe_unused qcom_qspi_resume(struct device *dev) +{ + struct spi_master *master = dev_get_drvdata(dev); + int ret; + + ret = pm_runtime_force_resume(dev); + if (ret) + return ret; + + ret = spi_master_resume(master); + if (ret) + pm_runtime_force_suspend(dev); + + return ret; +} + +static const struct dev_pm_ops qcom_qspi_dev_pm_ops = { + SET_RUNTIME_PM_OPS(qcom_qspi_runtime_suspend, + qcom_qspi_runtime_resume, NULL) + SET_SYSTEM_SLEEP_PM_OPS(qcom_qspi_suspend, qcom_qspi_resume) +}; + +static const struct of_device_id qcom_qspi_dt_match[] = { + { .compatible = "qcom,qspi-v1", }, + { } +}; +MODULE_DEVICE_TABLE(of, qcom_qspi_dt_match); + +static struct platform_driver qcom_qspi_driver = { + .driver = { + .name = "qcom_qspi", + .pm = &qcom_qspi_dev_pm_ops, + .of_match_table = qcom_qspi_dt_match, + }, + .probe = qcom_qspi_probe, + .remove = qcom_qspi_remove, +}; +module_platform_driver(qcom_qspi_driver); + +MODULE_DESCRIPTION("SPI driver for QSPI cores"); +MODULE_LICENSE("GPL v2"); diff --git a/drivers/spi/spi-qup.c b/drivers/spi/spi-qup.c new file mode 100644 index 000000000..2cc9bb413 --- /dev/null +++ b/drivers/spi/spi-qup.c @@ -0,0 +1,1328 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright (c) 2008-2014, The Linux foundation. All rights reserved. + */ + +#include <linux/clk.h> +#include <linux/delay.h> +#include <linux/err.h> +#include <linux/interrupt.h> +#include <linux/io.h> +#include <linux/list.h> +#include <linux/module.h> +#include <linux/of.h> +#include <linux/of_device.h> +#include <linux/platform_device.h> +#include <linux/pm_runtime.h> +#include <linux/spi/spi.h> +#include <linux/dmaengine.h> +#include <linux/dma-mapping.h> + +#define QUP_CONFIG 0x0000 +#define QUP_STATE 0x0004 +#define QUP_IO_M_MODES 0x0008 +#define QUP_SW_RESET 0x000c +#define QUP_OPERATIONAL 0x0018 +#define QUP_ERROR_FLAGS 0x001c +#define QUP_ERROR_FLAGS_EN 0x0020 +#define QUP_OPERATIONAL_MASK 0x0028 +#define QUP_HW_VERSION 0x0030 +#define QUP_MX_OUTPUT_CNT 0x0100 +#define QUP_OUTPUT_FIFO 0x0110 +#define QUP_MX_WRITE_CNT 0x0150 +#define QUP_MX_INPUT_CNT 0x0200 +#define QUP_MX_READ_CNT 0x0208 +#define QUP_INPUT_FIFO 0x0218 + +#define SPI_CONFIG 0x0300 +#define SPI_IO_CONTROL 0x0304 +#define SPI_ERROR_FLAGS 0x0308 +#define SPI_ERROR_FLAGS_EN 0x030c + +/* QUP_CONFIG fields */ +#define QUP_CONFIG_SPI_MODE (1 << 8) +#define QUP_CONFIG_CLOCK_AUTO_GATE BIT(13) +#define QUP_CONFIG_NO_INPUT BIT(7) +#define QUP_CONFIG_NO_OUTPUT BIT(6) +#define QUP_CONFIG_N 0x001f + +/* QUP_STATE fields */ +#define QUP_STATE_VALID BIT(2) +#define QUP_STATE_RESET 0 +#define QUP_STATE_RUN 1 +#define QUP_STATE_PAUSE 3 +#define QUP_STATE_MASK 3 +#define QUP_STATE_CLEAR 2 + +#define QUP_HW_VERSION_2_1_1 0x20010001 + +/* QUP_IO_M_MODES fields */ +#define QUP_IO_M_PACK_EN BIT(15) +#define QUP_IO_M_UNPACK_EN BIT(14) +#define QUP_IO_M_INPUT_MODE_MASK_SHIFT 12 +#define QUP_IO_M_OUTPUT_MODE_MASK_SHIFT 10 +#define QUP_IO_M_INPUT_MODE_MASK (3 << QUP_IO_M_INPUT_MODE_MASK_SHIFT) +#define QUP_IO_M_OUTPUT_MODE_MASK (3 << QUP_IO_M_OUTPUT_MODE_MASK_SHIFT) + +#define QUP_IO_M_OUTPUT_BLOCK_SIZE(x) (((x) & (0x03 << 0)) >> 0) +#define QUP_IO_M_OUTPUT_FIFO_SIZE(x) (((x) & (0x07 << 2)) >> 2) +#define QUP_IO_M_INPUT_BLOCK_SIZE(x) (((x) & (0x03 << 5)) >> 5) +#define QUP_IO_M_INPUT_FIFO_SIZE(x) (((x) & (0x07 << 7)) >> 7) + +#define QUP_IO_M_MODE_FIFO 0 +#define QUP_IO_M_MODE_BLOCK 1 +#define QUP_IO_M_MODE_DMOV 2 +#define QUP_IO_M_MODE_BAM 3 + +/* QUP_OPERATIONAL fields */ +#define QUP_OP_IN_BLOCK_READ_REQ BIT(13) +#define QUP_OP_OUT_BLOCK_WRITE_REQ BIT(12) +#define QUP_OP_MAX_INPUT_DONE_FLAG BIT(11) +#define QUP_OP_MAX_OUTPUT_DONE_FLAG BIT(10) +#define QUP_OP_IN_SERVICE_FLAG BIT(9) +#define QUP_OP_OUT_SERVICE_FLAG BIT(8) +#define QUP_OP_IN_FIFO_FULL BIT(7) +#define QUP_OP_OUT_FIFO_FULL BIT(6) +#define QUP_OP_IN_FIFO_NOT_EMPTY BIT(5) +#define QUP_OP_OUT_FIFO_NOT_EMPTY BIT(4) + +/* QUP_ERROR_FLAGS and QUP_ERROR_FLAGS_EN fields */ +#define QUP_ERROR_OUTPUT_OVER_RUN BIT(5) +#define QUP_ERROR_INPUT_UNDER_RUN BIT(4) +#define QUP_ERROR_OUTPUT_UNDER_RUN BIT(3) +#define QUP_ERROR_INPUT_OVER_RUN BIT(2) + +/* SPI_CONFIG fields */ +#define SPI_CONFIG_HS_MODE BIT(10) +#define SPI_CONFIG_INPUT_FIRST BIT(9) +#define SPI_CONFIG_LOOPBACK BIT(8) + +/* SPI_IO_CONTROL fields */ +#define SPI_IO_C_FORCE_CS BIT(11) +#define SPI_IO_C_CLK_IDLE_HIGH BIT(10) +#define SPI_IO_C_MX_CS_MODE BIT(8) +#define SPI_IO_C_CS_N_POLARITY_0 BIT(4) +#define SPI_IO_C_CS_SELECT(x) (((x) & 3) << 2) +#define SPI_IO_C_CS_SELECT_MASK 0x000c +#define SPI_IO_C_TRISTATE_CS BIT(1) +#define SPI_IO_C_NO_TRI_STATE BIT(0) + +/* SPI_ERROR_FLAGS and SPI_ERROR_FLAGS_EN fields */ +#define SPI_ERROR_CLK_OVER_RUN BIT(1) +#define SPI_ERROR_CLK_UNDER_RUN BIT(0) + +#define SPI_NUM_CHIPSELECTS 4 + +#define SPI_MAX_XFER (SZ_64K - 64) + +/* high speed mode is when bus rate is greater then 26MHz */ +#define SPI_HS_MIN_RATE 26000000 +#define SPI_MAX_RATE 50000000 + +#define SPI_DELAY_THRESHOLD 1 +#define SPI_DELAY_RETRY 10 + +struct spi_qup { + void __iomem *base; + struct device *dev; + struct clk *cclk; /* core clock */ + struct clk *iclk; /* interface clock */ + int irq; + spinlock_t lock; + + int in_fifo_sz; + int out_fifo_sz; + int in_blk_sz; + int out_blk_sz; + + struct spi_transfer *xfer; + struct completion done; + int error; + int w_size; /* bytes per SPI word */ + int n_words; + int tx_bytes; + int rx_bytes; + const u8 *tx_buf; + u8 *rx_buf; + int qup_v1; + + int mode; + struct dma_slave_config rx_conf; + struct dma_slave_config tx_conf; +}; + +static int spi_qup_io_config(struct spi_device *spi, struct spi_transfer *xfer); + +static inline bool spi_qup_is_flag_set(struct spi_qup *controller, u32 flag) +{ + u32 opflag = readl_relaxed(controller->base + QUP_OPERATIONAL); + + return (opflag & flag) != 0; +} + +static inline bool spi_qup_is_dma_xfer(int mode) +{ + if (mode == QUP_IO_M_MODE_DMOV || mode == QUP_IO_M_MODE_BAM) + return true; + + return false; +} + +/* get's the transaction size length */ +static inline unsigned int spi_qup_len(struct spi_qup *controller) +{ + return controller->n_words * controller->w_size; +} + +static inline bool spi_qup_is_valid_state(struct spi_qup *controller) +{ + u32 opstate = readl_relaxed(controller->base + QUP_STATE); + + return opstate & QUP_STATE_VALID; +} + +static int spi_qup_set_state(struct spi_qup *controller, u32 state) +{ + unsigned long loop; + u32 cur_state; + + loop = 0; + while (!spi_qup_is_valid_state(controller)) { + + usleep_range(SPI_DELAY_THRESHOLD, SPI_DELAY_THRESHOLD * 2); + + if (++loop > SPI_DELAY_RETRY) + return -EIO; + } + + if (loop) + dev_dbg(controller->dev, "invalid state for %ld,us %d\n", + loop, state); + + cur_state = readl_relaxed(controller->base + QUP_STATE); + /* + * Per spec: for PAUSE_STATE to RESET_STATE, two writes + * of (b10) are required + */ + if (((cur_state & QUP_STATE_MASK) == QUP_STATE_PAUSE) && + (state == QUP_STATE_RESET)) { + writel_relaxed(QUP_STATE_CLEAR, controller->base + QUP_STATE); + writel_relaxed(QUP_STATE_CLEAR, controller->base + QUP_STATE); + } else { + cur_state &= ~QUP_STATE_MASK; + cur_state |= state; + writel_relaxed(cur_state, controller->base + QUP_STATE); + } + + loop = 0; + while (!spi_qup_is_valid_state(controller)) { + + usleep_range(SPI_DELAY_THRESHOLD, SPI_DELAY_THRESHOLD * 2); + + if (++loop > SPI_DELAY_RETRY) + return -EIO; + } + + return 0; +} + +static void spi_qup_read_from_fifo(struct spi_qup *controller, u32 num_words) +{ + u8 *rx_buf = controller->rx_buf; + int i, shift, num_bytes; + u32 word; + + for (; num_words; num_words--) { + + word = readl_relaxed(controller->base + QUP_INPUT_FIFO); + + num_bytes = min_t(int, spi_qup_len(controller) - + controller->rx_bytes, + controller->w_size); + + if (!rx_buf) { + controller->rx_bytes += num_bytes; + continue; + } + + for (i = 0; i < num_bytes; i++, controller->rx_bytes++) { + /* + * The data format depends on bytes per SPI word: + * 4 bytes: 0x12345678 + * 2 bytes: 0x00001234 + * 1 byte : 0x00000012 + */ + shift = BITS_PER_BYTE; + shift *= (controller->w_size - i - 1); + rx_buf[controller->rx_bytes] = word >> shift; + } + } +} + +static void spi_qup_read(struct spi_qup *controller, u32 *opflags) +{ + u32 remainder, words_per_block, num_words; + bool is_block_mode = controller->mode == QUP_IO_M_MODE_BLOCK; + + remainder = DIV_ROUND_UP(spi_qup_len(controller) - controller->rx_bytes, + controller->w_size); + words_per_block = controller->in_blk_sz >> 2; + + do { + /* ACK by clearing service flag */ + writel_relaxed(QUP_OP_IN_SERVICE_FLAG, + controller->base + QUP_OPERATIONAL); + + if (!remainder) + goto exit; + + if (is_block_mode) { + num_words = (remainder > words_per_block) ? + words_per_block : remainder; + } else { + if (!spi_qup_is_flag_set(controller, + QUP_OP_IN_FIFO_NOT_EMPTY)) + break; + + num_words = 1; + } + + /* read up to the maximum transfer size available */ + spi_qup_read_from_fifo(controller, num_words); + + remainder -= num_words; + + /* if block mode, check to see if next block is available */ + if (is_block_mode && !spi_qup_is_flag_set(controller, + QUP_OP_IN_BLOCK_READ_REQ)) + break; + + } while (remainder); + + /* + * Due to extra stickiness of the QUP_OP_IN_SERVICE_FLAG during block + * reads, it has to be cleared again at the very end. However, be sure + * to refresh opflags value because MAX_INPUT_DONE_FLAG may now be + * present and this is used to determine if transaction is complete + */ +exit: + if (!remainder) { + *opflags = readl_relaxed(controller->base + QUP_OPERATIONAL); + if (is_block_mode && *opflags & QUP_OP_MAX_INPUT_DONE_FLAG) + writel_relaxed(QUP_OP_IN_SERVICE_FLAG, + controller->base + QUP_OPERATIONAL); + } +} + +static void spi_qup_write_to_fifo(struct spi_qup *controller, u32 num_words) +{ + const u8 *tx_buf = controller->tx_buf; + int i, num_bytes; + u32 word, data; + + for (; num_words; num_words--) { + word = 0; + + num_bytes = min_t(int, spi_qup_len(controller) - + controller->tx_bytes, + controller->w_size); + if (tx_buf) + for (i = 0; i < num_bytes; i++) { + data = tx_buf[controller->tx_bytes + i]; + word |= data << (BITS_PER_BYTE * (3 - i)); + } + + controller->tx_bytes += num_bytes; + + writel_relaxed(word, controller->base + QUP_OUTPUT_FIFO); + } +} + +static void spi_qup_dma_done(void *data) +{ + struct spi_qup *qup = data; + + complete(&qup->done); +} + +static void spi_qup_write(struct spi_qup *controller) +{ + bool is_block_mode = controller->mode == QUP_IO_M_MODE_BLOCK; + u32 remainder, words_per_block, num_words; + + remainder = DIV_ROUND_UP(spi_qup_len(controller) - controller->tx_bytes, + controller->w_size); + words_per_block = controller->out_blk_sz >> 2; + + do { + /* ACK by clearing service flag */ + writel_relaxed(QUP_OP_OUT_SERVICE_FLAG, + controller->base + QUP_OPERATIONAL); + + /* make sure the interrupt is valid */ + if (!remainder) + return; + + if (is_block_mode) { + num_words = (remainder > words_per_block) ? + words_per_block : remainder; + } else { + if (spi_qup_is_flag_set(controller, + QUP_OP_OUT_FIFO_FULL)) + break; + + num_words = 1; + } + + spi_qup_write_to_fifo(controller, num_words); + + remainder -= num_words; + + /* if block mode, check to see if next block is available */ + if (is_block_mode && !spi_qup_is_flag_set(controller, + QUP_OP_OUT_BLOCK_WRITE_REQ)) + break; + + } while (remainder); +} + +static int spi_qup_prep_sg(struct spi_master *master, struct scatterlist *sgl, + unsigned int nents, enum dma_transfer_direction dir, + dma_async_tx_callback callback) +{ + struct spi_qup *qup = spi_master_get_devdata(master); + unsigned long flags = DMA_PREP_INTERRUPT | DMA_PREP_FENCE; + struct dma_async_tx_descriptor *desc; + struct dma_chan *chan; + dma_cookie_t cookie; + + if (dir == DMA_MEM_TO_DEV) + chan = master->dma_tx; + else + chan = master->dma_rx; + + desc = dmaengine_prep_slave_sg(chan, sgl, nents, dir, flags); + if (IS_ERR_OR_NULL(desc)) + return desc ? PTR_ERR(desc) : -EINVAL; + + desc->callback = callback; + desc->callback_param = qup; + + cookie = dmaengine_submit(desc); + + return dma_submit_error(cookie); +} + +static void spi_qup_dma_terminate(struct spi_master *master, + struct spi_transfer *xfer) +{ + if (xfer->tx_buf) + dmaengine_terminate_all(master->dma_tx); + if (xfer->rx_buf) + dmaengine_terminate_all(master->dma_rx); +} + +static u32 spi_qup_sgl_get_nents_len(struct scatterlist *sgl, u32 max, + u32 *nents) +{ + struct scatterlist *sg; + u32 total = 0; + + for (sg = sgl; sg; sg = sg_next(sg)) { + unsigned int len = sg_dma_len(sg); + + /* check for overflow as well as limit */ + if (((total + len) < total) || ((total + len) > max)) + break; + + total += len; + (*nents)++; + } + + return total; +} + +static int spi_qup_do_dma(struct spi_device *spi, struct spi_transfer *xfer, + unsigned long timeout) +{ + dma_async_tx_callback rx_done = NULL, tx_done = NULL; + struct spi_master *master = spi->master; + struct spi_qup *qup = spi_master_get_devdata(master); + struct scatterlist *tx_sgl, *rx_sgl; + int ret; + + if (xfer->rx_buf) + rx_done = spi_qup_dma_done; + else if (xfer->tx_buf) + tx_done = spi_qup_dma_done; + + rx_sgl = xfer->rx_sg.sgl; + tx_sgl = xfer->tx_sg.sgl; + + do { + u32 rx_nents = 0, tx_nents = 0; + + if (rx_sgl) + qup->n_words = spi_qup_sgl_get_nents_len(rx_sgl, + SPI_MAX_XFER, &rx_nents) / qup->w_size; + if (tx_sgl) + qup->n_words = spi_qup_sgl_get_nents_len(tx_sgl, + SPI_MAX_XFER, &tx_nents) / qup->w_size; + if (!qup->n_words) + return -EIO; + + ret = spi_qup_io_config(spi, xfer); + if (ret) + return ret; + + /* before issuing the descriptors, set the QUP to run */ + ret = spi_qup_set_state(qup, QUP_STATE_RUN); + if (ret) { + dev_warn(qup->dev, "cannot set RUN state\n"); + return ret; + } + if (rx_sgl) { + ret = spi_qup_prep_sg(master, rx_sgl, rx_nents, + DMA_DEV_TO_MEM, rx_done); + if (ret) + return ret; + dma_async_issue_pending(master->dma_rx); + } + + if (tx_sgl) { + ret = spi_qup_prep_sg(master, tx_sgl, tx_nents, + DMA_MEM_TO_DEV, tx_done); + if (ret) + return ret; + + dma_async_issue_pending(master->dma_tx); + } + + if (!wait_for_completion_timeout(&qup->done, timeout)) + return -ETIMEDOUT; + + for (; rx_sgl && rx_nents--; rx_sgl = sg_next(rx_sgl)) + ; + for (; tx_sgl && tx_nents--; tx_sgl = sg_next(tx_sgl)) + ; + + } while (rx_sgl || tx_sgl); + + return 0; +} + +static int spi_qup_do_pio(struct spi_device *spi, struct spi_transfer *xfer, + unsigned long timeout) +{ + struct spi_master *master = spi->master; + struct spi_qup *qup = spi_master_get_devdata(master); + int ret, n_words, iterations, offset = 0; + + n_words = qup->n_words; + iterations = n_words / SPI_MAX_XFER; /* round down */ + qup->rx_buf = xfer->rx_buf; + qup->tx_buf = xfer->tx_buf; + + do { + if (iterations) + qup->n_words = SPI_MAX_XFER; + else + qup->n_words = n_words % SPI_MAX_XFER; + + if (qup->tx_buf && offset) + qup->tx_buf = xfer->tx_buf + offset * SPI_MAX_XFER; + + if (qup->rx_buf && offset) + qup->rx_buf = xfer->rx_buf + offset * SPI_MAX_XFER; + + /* + * if the transaction is small enough, we need + * to fallback to FIFO mode + */ + if (qup->n_words <= (qup->in_fifo_sz / sizeof(u32))) + qup->mode = QUP_IO_M_MODE_FIFO; + + ret = spi_qup_io_config(spi, xfer); + if (ret) + return ret; + + ret = spi_qup_set_state(qup, QUP_STATE_RUN); + if (ret) { + dev_warn(qup->dev, "cannot set RUN state\n"); + return ret; + } + + ret = spi_qup_set_state(qup, QUP_STATE_PAUSE); + if (ret) { + dev_warn(qup->dev, "cannot set PAUSE state\n"); + return ret; + } + + if (qup->mode == QUP_IO_M_MODE_FIFO) + spi_qup_write(qup); + + ret = spi_qup_set_state(qup, QUP_STATE_RUN); + if (ret) { + dev_warn(qup->dev, "cannot set RUN state\n"); + return ret; + } + + if (!wait_for_completion_timeout(&qup->done, timeout)) + return -ETIMEDOUT; + + offset++; + } while (iterations--); + + return 0; +} + +static bool spi_qup_data_pending(struct spi_qup *controller) +{ + unsigned int remainder_tx, remainder_rx; + + remainder_tx = DIV_ROUND_UP(spi_qup_len(controller) - + controller->tx_bytes, controller->w_size); + + remainder_rx = DIV_ROUND_UP(spi_qup_len(controller) - + controller->rx_bytes, controller->w_size); + + return remainder_tx || remainder_rx; +} + +static irqreturn_t spi_qup_qup_irq(int irq, void *dev_id) +{ + struct spi_qup *controller = dev_id; + u32 opflags, qup_err, spi_err; + unsigned long flags; + int error = 0; + + qup_err = readl_relaxed(controller->base + QUP_ERROR_FLAGS); + spi_err = readl_relaxed(controller->base + SPI_ERROR_FLAGS); + opflags = readl_relaxed(controller->base + QUP_OPERATIONAL); + + writel_relaxed(qup_err, controller->base + QUP_ERROR_FLAGS); + writel_relaxed(spi_err, controller->base + SPI_ERROR_FLAGS); + + if (qup_err) { + if (qup_err & QUP_ERROR_OUTPUT_OVER_RUN) + dev_warn(controller->dev, "OUTPUT_OVER_RUN\n"); + if (qup_err & QUP_ERROR_INPUT_UNDER_RUN) + dev_warn(controller->dev, "INPUT_UNDER_RUN\n"); + if (qup_err & QUP_ERROR_OUTPUT_UNDER_RUN) + dev_warn(controller->dev, "OUTPUT_UNDER_RUN\n"); + if (qup_err & QUP_ERROR_INPUT_OVER_RUN) + dev_warn(controller->dev, "INPUT_OVER_RUN\n"); + + error = -EIO; + } + + if (spi_err) { + if (spi_err & SPI_ERROR_CLK_OVER_RUN) + dev_warn(controller->dev, "CLK_OVER_RUN\n"); + if (spi_err & SPI_ERROR_CLK_UNDER_RUN) + dev_warn(controller->dev, "CLK_UNDER_RUN\n"); + + error = -EIO; + } + + spin_lock_irqsave(&controller->lock, flags); + if (!controller->error) + controller->error = error; + spin_unlock_irqrestore(&controller->lock, flags); + + if (spi_qup_is_dma_xfer(controller->mode)) { + writel_relaxed(opflags, controller->base + QUP_OPERATIONAL); + } else { + if (opflags & QUP_OP_IN_SERVICE_FLAG) + spi_qup_read(controller, &opflags); + + if (opflags & QUP_OP_OUT_SERVICE_FLAG) + spi_qup_write(controller); + + if (!spi_qup_data_pending(controller)) + complete(&controller->done); + } + + if (error) + complete(&controller->done); + + if (opflags & QUP_OP_MAX_INPUT_DONE_FLAG) { + if (!spi_qup_is_dma_xfer(controller->mode)) { + if (spi_qup_data_pending(controller)) + return IRQ_HANDLED; + } + complete(&controller->done); + } + + return IRQ_HANDLED; +} + +/* set clock freq ... bits per word, determine mode */ +static int spi_qup_io_prep(struct spi_device *spi, struct spi_transfer *xfer) +{ + struct spi_qup *controller = spi_master_get_devdata(spi->master); + int ret; + + if (spi->mode & SPI_LOOP && xfer->len > controller->in_fifo_sz) { + dev_err(controller->dev, "too big size for loopback %d > %d\n", + xfer->len, controller->in_fifo_sz); + return -EIO; + } + + ret = clk_set_rate(controller->cclk, xfer->speed_hz); + if (ret) { + dev_err(controller->dev, "fail to set frequency %d", + xfer->speed_hz); + return -EIO; + } + + controller->w_size = DIV_ROUND_UP(xfer->bits_per_word, 8); + controller->n_words = xfer->len / controller->w_size; + + if (controller->n_words <= (controller->in_fifo_sz / sizeof(u32))) + controller->mode = QUP_IO_M_MODE_FIFO; + else if (spi->master->can_dma && + spi->master->can_dma(spi->master, spi, xfer) && + spi->master->cur_msg_mapped) + controller->mode = QUP_IO_M_MODE_BAM; + else + controller->mode = QUP_IO_M_MODE_BLOCK; + + return 0; +} + +/* prep qup for another spi transaction of specific type */ +static int spi_qup_io_config(struct spi_device *spi, struct spi_transfer *xfer) +{ + struct spi_qup *controller = spi_master_get_devdata(spi->master); + u32 config, iomode, control; + unsigned long flags; + + spin_lock_irqsave(&controller->lock, flags); + controller->xfer = xfer; + controller->error = 0; + controller->rx_bytes = 0; + controller->tx_bytes = 0; + spin_unlock_irqrestore(&controller->lock, flags); + + + if (spi_qup_set_state(controller, QUP_STATE_RESET)) { + dev_err(controller->dev, "cannot set RESET state\n"); + return -EIO; + } + + switch (controller->mode) { + case QUP_IO_M_MODE_FIFO: + writel_relaxed(controller->n_words, + controller->base + QUP_MX_READ_CNT); + writel_relaxed(controller->n_words, + controller->base + QUP_MX_WRITE_CNT); + /* must be zero for FIFO */ + writel_relaxed(0, controller->base + QUP_MX_INPUT_CNT); + writel_relaxed(0, controller->base + QUP_MX_OUTPUT_CNT); + break; + case QUP_IO_M_MODE_BAM: + writel_relaxed(controller->n_words, + controller->base + QUP_MX_INPUT_CNT); + writel_relaxed(controller->n_words, + controller->base + QUP_MX_OUTPUT_CNT); + /* must be zero for BLOCK and BAM */ + writel_relaxed(0, controller->base + QUP_MX_READ_CNT); + writel_relaxed(0, controller->base + QUP_MX_WRITE_CNT); + + if (!controller->qup_v1) { + void __iomem *input_cnt; + + input_cnt = controller->base + QUP_MX_INPUT_CNT; + /* + * for DMA transfers, both QUP_MX_INPUT_CNT and + * QUP_MX_OUTPUT_CNT must be zero to all cases but one. + * That case is a non-balanced transfer when there is + * only a rx_buf. + */ + if (xfer->tx_buf) + writel_relaxed(0, input_cnt); + else + writel_relaxed(controller->n_words, input_cnt); + + writel_relaxed(0, controller->base + QUP_MX_OUTPUT_CNT); + } + break; + case QUP_IO_M_MODE_BLOCK: + reinit_completion(&controller->done); + writel_relaxed(controller->n_words, + controller->base + QUP_MX_INPUT_CNT); + writel_relaxed(controller->n_words, + controller->base + QUP_MX_OUTPUT_CNT); + /* must be zero for BLOCK and BAM */ + writel_relaxed(0, controller->base + QUP_MX_READ_CNT); + writel_relaxed(0, controller->base + QUP_MX_WRITE_CNT); + break; + default: + dev_err(controller->dev, "unknown mode = %d\n", + controller->mode); + return -EIO; + } + + iomode = readl_relaxed(controller->base + QUP_IO_M_MODES); + /* Set input and output transfer mode */ + iomode &= ~(QUP_IO_M_INPUT_MODE_MASK | QUP_IO_M_OUTPUT_MODE_MASK); + + if (!spi_qup_is_dma_xfer(controller->mode)) + iomode &= ~(QUP_IO_M_PACK_EN | QUP_IO_M_UNPACK_EN); + else + iomode |= QUP_IO_M_PACK_EN | QUP_IO_M_UNPACK_EN; + + iomode |= (controller->mode << QUP_IO_M_OUTPUT_MODE_MASK_SHIFT); + iomode |= (controller->mode << QUP_IO_M_INPUT_MODE_MASK_SHIFT); + + writel_relaxed(iomode, controller->base + QUP_IO_M_MODES); + + control = readl_relaxed(controller->base + SPI_IO_CONTROL); + + if (spi->mode & SPI_CPOL) + control |= SPI_IO_C_CLK_IDLE_HIGH; + else + control &= ~SPI_IO_C_CLK_IDLE_HIGH; + + writel_relaxed(control, controller->base + SPI_IO_CONTROL); + + config = readl_relaxed(controller->base + SPI_CONFIG); + + if (spi->mode & SPI_LOOP) + config |= SPI_CONFIG_LOOPBACK; + else + config &= ~SPI_CONFIG_LOOPBACK; + + if (spi->mode & SPI_CPHA) + config &= ~SPI_CONFIG_INPUT_FIRST; + else + config |= SPI_CONFIG_INPUT_FIRST; + + /* + * HS_MODE improves signal stability for spi-clk high rates, + * but is invalid in loop back mode. + */ + if ((xfer->speed_hz >= SPI_HS_MIN_RATE) && !(spi->mode & SPI_LOOP)) + config |= SPI_CONFIG_HS_MODE; + else + config &= ~SPI_CONFIG_HS_MODE; + + writel_relaxed(config, controller->base + SPI_CONFIG); + + config = readl_relaxed(controller->base + QUP_CONFIG); + config &= ~(QUP_CONFIG_NO_INPUT | QUP_CONFIG_NO_OUTPUT | QUP_CONFIG_N); + config |= xfer->bits_per_word - 1; + config |= QUP_CONFIG_SPI_MODE; + + if (spi_qup_is_dma_xfer(controller->mode)) { + if (!xfer->tx_buf) + config |= QUP_CONFIG_NO_OUTPUT; + if (!xfer->rx_buf) + config |= QUP_CONFIG_NO_INPUT; + } + + writel_relaxed(config, controller->base + QUP_CONFIG); + + /* only write to OPERATIONAL_MASK when register is present */ + if (!controller->qup_v1) { + u32 mask = 0; + + /* + * mask INPUT and OUTPUT service flags to prevent IRQs on FIFO + * status change in BAM mode + */ + + if (spi_qup_is_dma_xfer(controller->mode)) + mask = QUP_OP_IN_SERVICE_FLAG | QUP_OP_OUT_SERVICE_FLAG; + + writel_relaxed(mask, controller->base + QUP_OPERATIONAL_MASK); + } + + return 0; +} + +static int spi_qup_transfer_one(struct spi_master *master, + struct spi_device *spi, + struct spi_transfer *xfer) +{ + struct spi_qup *controller = spi_master_get_devdata(master); + unsigned long timeout, flags; + int ret; + + ret = spi_qup_io_prep(spi, xfer); + if (ret) + return ret; + + timeout = DIV_ROUND_UP(xfer->speed_hz, MSEC_PER_SEC); + timeout = DIV_ROUND_UP(min_t(unsigned long, SPI_MAX_XFER, + xfer->len) * 8, timeout); + timeout = 100 * msecs_to_jiffies(timeout); + + reinit_completion(&controller->done); + + spin_lock_irqsave(&controller->lock, flags); + controller->xfer = xfer; + controller->error = 0; + controller->rx_bytes = 0; + controller->tx_bytes = 0; + spin_unlock_irqrestore(&controller->lock, flags); + + if (spi_qup_is_dma_xfer(controller->mode)) + ret = spi_qup_do_dma(spi, xfer, timeout); + else + ret = spi_qup_do_pio(spi, xfer, timeout); + + spi_qup_set_state(controller, QUP_STATE_RESET); + spin_lock_irqsave(&controller->lock, flags); + if (!ret) + ret = controller->error; + spin_unlock_irqrestore(&controller->lock, flags); + + if (ret && spi_qup_is_dma_xfer(controller->mode)) + spi_qup_dma_terminate(master, xfer); + + return ret; +} + +static bool spi_qup_can_dma(struct spi_master *master, struct spi_device *spi, + struct spi_transfer *xfer) +{ + struct spi_qup *qup = spi_master_get_devdata(master); + size_t dma_align = dma_get_cache_alignment(); + int n_words; + + if (xfer->rx_buf) { + if (!IS_ALIGNED((size_t)xfer->rx_buf, dma_align) || + IS_ERR_OR_NULL(master->dma_rx)) + return false; + if (qup->qup_v1 && (xfer->len % qup->in_blk_sz)) + return false; + } + + if (xfer->tx_buf) { + if (!IS_ALIGNED((size_t)xfer->tx_buf, dma_align) || + IS_ERR_OR_NULL(master->dma_tx)) + return false; + if (qup->qup_v1 && (xfer->len % qup->out_blk_sz)) + return false; + } + + n_words = xfer->len / DIV_ROUND_UP(xfer->bits_per_word, 8); + if (n_words <= (qup->in_fifo_sz / sizeof(u32))) + return false; + + return true; +} + +static void spi_qup_release_dma(struct spi_master *master) +{ + if (!IS_ERR_OR_NULL(master->dma_rx)) + dma_release_channel(master->dma_rx); + if (!IS_ERR_OR_NULL(master->dma_tx)) + dma_release_channel(master->dma_tx); +} + +static int spi_qup_init_dma(struct spi_master *master, resource_size_t base) +{ + struct spi_qup *spi = spi_master_get_devdata(master); + struct dma_slave_config *rx_conf = &spi->rx_conf, + *tx_conf = &spi->tx_conf; + struct device *dev = spi->dev; + int ret; + + /* allocate dma resources, if available */ + master->dma_rx = dma_request_chan(dev, "rx"); + if (IS_ERR(master->dma_rx)) + return PTR_ERR(master->dma_rx); + + master->dma_tx = dma_request_chan(dev, "tx"); + if (IS_ERR(master->dma_tx)) { + ret = PTR_ERR(master->dma_tx); + goto err_tx; + } + + /* set DMA parameters */ + rx_conf->direction = DMA_DEV_TO_MEM; + rx_conf->device_fc = 1; + rx_conf->src_addr = base + QUP_INPUT_FIFO; + rx_conf->src_maxburst = spi->in_blk_sz; + + tx_conf->direction = DMA_MEM_TO_DEV; + tx_conf->device_fc = 1; + tx_conf->dst_addr = base + QUP_OUTPUT_FIFO; + tx_conf->dst_maxburst = spi->out_blk_sz; + + ret = dmaengine_slave_config(master->dma_rx, rx_conf); + if (ret) { + dev_err(dev, "failed to configure RX channel\n"); + goto err; + } + + ret = dmaengine_slave_config(master->dma_tx, tx_conf); + if (ret) { + dev_err(dev, "failed to configure TX channel\n"); + goto err; + } + + return 0; + +err: + dma_release_channel(master->dma_tx); +err_tx: + dma_release_channel(master->dma_rx); + return ret; +} + +static void spi_qup_set_cs(struct spi_device *spi, bool val) +{ + struct spi_qup *controller; + u32 spi_ioc; + u32 spi_ioc_orig; + + controller = spi_master_get_devdata(spi->master); + spi_ioc = readl_relaxed(controller->base + SPI_IO_CONTROL); + spi_ioc_orig = spi_ioc; + if (!val) + spi_ioc |= SPI_IO_C_FORCE_CS; + else + spi_ioc &= ~SPI_IO_C_FORCE_CS; + + if (spi_ioc != spi_ioc_orig) + writel_relaxed(spi_ioc, controller->base + SPI_IO_CONTROL); +} + +static int spi_qup_probe(struct platform_device *pdev) +{ + struct spi_master *master; + struct clk *iclk, *cclk; + struct spi_qup *controller; + struct resource *res; + struct device *dev; + void __iomem *base; + u32 max_freq, iomode, num_cs; + int ret, irq, size; + + dev = &pdev->dev; + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + base = devm_ioremap_resource(dev, res); + if (IS_ERR(base)) + return PTR_ERR(base); + + irq = platform_get_irq(pdev, 0); + if (irq < 0) + return irq; + + cclk = devm_clk_get(dev, "core"); + if (IS_ERR(cclk)) + return PTR_ERR(cclk); + + iclk = devm_clk_get(dev, "iface"); + if (IS_ERR(iclk)) + return PTR_ERR(iclk); + + /* This is optional parameter */ + if (of_property_read_u32(dev->of_node, "spi-max-frequency", &max_freq)) + max_freq = SPI_MAX_RATE; + + if (!max_freq || max_freq > SPI_MAX_RATE) { + dev_err(dev, "invalid clock frequency %d\n", max_freq); + return -ENXIO; + } + + master = spi_alloc_master(dev, sizeof(struct spi_qup)); + if (!master) { + dev_err(dev, "cannot allocate master\n"); + return -ENOMEM; + } + + /* use num-cs unless not present or out of range */ + if (of_property_read_u32(dev->of_node, "num-cs", &num_cs) || + num_cs > SPI_NUM_CHIPSELECTS) + master->num_chipselect = SPI_NUM_CHIPSELECTS; + else + master->num_chipselect = num_cs; + + master->bus_num = pdev->id; + master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH | SPI_LOOP; + master->bits_per_word_mask = SPI_BPW_RANGE_MASK(4, 32); + master->max_speed_hz = max_freq; + master->transfer_one = spi_qup_transfer_one; + master->dev.of_node = pdev->dev.of_node; + master->auto_runtime_pm = true; + master->dma_alignment = dma_get_cache_alignment(); + master->max_dma_len = SPI_MAX_XFER; + + platform_set_drvdata(pdev, master); + + controller = spi_master_get_devdata(master); + + controller->dev = dev; + controller->base = base; + controller->iclk = iclk; + controller->cclk = cclk; + controller->irq = irq; + + ret = spi_qup_init_dma(master, res->start); + if (ret == -EPROBE_DEFER) + goto error; + else if (!ret) + master->can_dma = spi_qup_can_dma; + + controller->qup_v1 = (uintptr_t)of_device_get_match_data(dev); + + if (!controller->qup_v1) + master->set_cs = spi_qup_set_cs; + + spin_lock_init(&controller->lock); + init_completion(&controller->done); + + ret = clk_prepare_enable(cclk); + if (ret) { + dev_err(dev, "cannot enable core clock\n"); + goto error_dma; + } + + ret = clk_prepare_enable(iclk); + if (ret) { + clk_disable_unprepare(cclk); + dev_err(dev, "cannot enable iface clock\n"); + goto error_dma; + } + + iomode = readl_relaxed(base + QUP_IO_M_MODES); + + size = QUP_IO_M_OUTPUT_BLOCK_SIZE(iomode); + if (size) + controller->out_blk_sz = size * 16; + else + controller->out_blk_sz = 4; + + size = QUP_IO_M_INPUT_BLOCK_SIZE(iomode); + if (size) + controller->in_blk_sz = size * 16; + else + controller->in_blk_sz = 4; + + size = QUP_IO_M_OUTPUT_FIFO_SIZE(iomode); + controller->out_fifo_sz = controller->out_blk_sz * (2 << size); + + size = QUP_IO_M_INPUT_FIFO_SIZE(iomode); + controller->in_fifo_sz = controller->in_blk_sz * (2 << size); + + dev_info(dev, "IN:block:%d, fifo:%d, OUT:block:%d, fifo:%d\n", + controller->in_blk_sz, controller->in_fifo_sz, + controller->out_blk_sz, controller->out_fifo_sz); + + writel_relaxed(1, base + QUP_SW_RESET); + + ret = spi_qup_set_state(controller, QUP_STATE_RESET); + if (ret) { + dev_err(dev, "cannot set RESET state\n"); + goto error_clk; + } + + writel_relaxed(0, base + QUP_OPERATIONAL); + writel_relaxed(0, base + QUP_IO_M_MODES); + + if (!controller->qup_v1) + writel_relaxed(0, base + QUP_OPERATIONAL_MASK); + + writel_relaxed(SPI_ERROR_CLK_UNDER_RUN | SPI_ERROR_CLK_OVER_RUN, + base + SPI_ERROR_FLAGS_EN); + + /* if earlier version of the QUP, disable INPUT_OVERRUN */ + if (controller->qup_v1) + writel_relaxed(QUP_ERROR_OUTPUT_OVER_RUN | + QUP_ERROR_INPUT_UNDER_RUN | QUP_ERROR_OUTPUT_UNDER_RUN, + base + QUP_ERROR_FLAGS_EN); + + writel_relaxed(0, base + SPI_CONFIG); + writel_relaxed(SPI_IO_C_NO_TRI_STATE, base + SPI_IO_CONTROL); + + ret = devm_request_irq(dev, irq, spi_qup_qup_irq, + IRQF_TRIGGER_HIGH, pdev->name, controller); + if (ret) + goto error_clk; + + pm_runtime_set_autosuspend_delay(dev, MSEC_PER_SEC); + pm_runtime_use_autosuspend(dev); + pm_runtime_set_active(dev); + pm_runtime_enable(dev); + + ret = devm_spi_register_master(dev, master); + if (ret) + goto disable_pm; + + return 0; + +disable_pm: + pm_runtime_disable(&pdev->dev); +error_clk: + clk_disable_unprepare(cclk); + clk_disable_unprepare(iclk); +error_dma: + spi_qup_release_dma(master); +error: + spi_master_put(master); + return ret; +} + +#ifdef CONFIG_PM +static int spi_qup_pm_suspend_runtime(struct device *device) +{ + struct spi_master *master = dev_get_drvdata(device); + struct spi_qup *controller = spi_master_get_devdata(master); + u32 config; + + /* Enable clocks auto gaiting */ + config = readl(controller->base + QUP_CONFIG); + config |= QUP_CONFIG_CLOCK_AUTO_GATE; + writel_relaxed(config, controller->base + QUP_CONFIG); + + clk_disable_unprepare(controller->cclk); + clk_disable_unprepare(controller->iclk); + + return 0; +} + +static int spi_qup_pm_resume_runtime(struct device *device) +{ + struct spi_master *master = dev_get_drvdata(device); + struct spi_qup *controller = spi_master_get_devdata(master); + u32 config; + int ret; + + ret = clk_prepare_enable(controller->iclk); + if (ret) + return ret; + + ret = clk_prepare_enable(controller->cclk); + if (ret) { + clk_disable_unprepare(controller->iclk); + return ret; + } + + /* Disable clocks auto gaiting */ + config = readl_relaxed(controller->base + QUP_CONFIG); + config &= ~QUP_CONFIG_CLOCK_AUTO_GATE; + writel_relaxed(config, controller->base + QUP_CONFIG); + return 0; +} +#endif /* CONFIG_PM */ + +#ifdef CONFIG_PM_SLEEP +static int spi_qup_suspend(struct device *device) +{ + struct spi_master *master = dev_get_drvdata(device); + struct spi_qup *controller = spi_master_get_devdata(master); + int ret; + + if (pm_runtime_suspended(device)) { + ret = spi_qup_pm_resume_runtime(device); + if (ret) + return ret; + } + ret = spi_master_suspend(master); + if (ret) + return ret; + + ret = spi_qup_set_state(controller, QUP_STATE_RESET); + if (ret) + return ret; + + clk_disable_unprepare(controller->cclk); + clk_disable_unprepare(controller->iclk); + return 0; +} + +static int spi_qup_resume(struct device *device) +{ + struct spi_master *master = dev_get_drvdata(device); + struct spi_qup *controller = spi_master_get_devdata(master); + int ret; + + ret = clk_prepare_enable(controller->iclk); + if (ret) + return ret; + + ret = clk_prepare_enable(controller->cclk); + if (ret) { + clk_disable_unprepare(controller->iclk); + return ret; + } + + ret = spi_qup_set_state(controller, QUP_STATE_RESET); + if (ret) + goto disable_clk; + + ret = spi_master_resume(master); + if (ret) + goto disable_clk; + + return 0; + +disable_clk: + clk_disable_unprepare(controller->cclk); + clk_disable_unprepare(controller->iclk); + return ret; +} +#endif /* CONFIG_PM_SLEEP */ + +static int spi_qup_remove(struct platform_device *pdev) +{ + struct spi_master *master = dev_get_drvdata(&pdev->dev); + struct spi_qup *controller = spi_master_get_devdata(master); + int ret; + + ret = pm_runtime_get_sync(&pdev->dev); + + if (ret >= 0) { + ret = spi_qup_set_state(controller, QUP_STATE_RESET); + if (ret) + dev_warn(&pdev->dev, "failed to reset controller (%pe)\n", + ERR_PTR(ret)); + + clk_disable_unprepare(controller->cclk); + clk_disable_unprepare(controller->iclk); + } else { + dev_warn(&pdev->dev, "failed to resume, skip hw disable (%pe)\n", + ERR_PTR(ret)); + } + + spi_qup_release_dma(master); + + pm_runtime_put_noidle(&pdev->dev); + pm_runtime_disable(&pdev->dev); + + return 0; +} + +static const struct of_device_id spi_qup_dt_match[] = { + { .compatible = "qcom,spi-qup-v1.1.1", .data = (void *)1, }, + { .compatible = "qcom,spi-qup-v2.1.1", }, + { .compatible = "qcom,spi-qup-v2.2.1", }, + { } +}; +MODULE_DEVICE_TABLE(of, spi_qup_dt_match); + +static const struct dev_pm_ops spi_qup_dev_pm_ops = { + SET_SYSTEM_SLEEP_PM_OPS(spi_qup_suspend, spi_qup_resume) + SET_RUNTIME_PM_OPS(spi_qup_pm_suspend_runtime, + spi_qup_pm_resume_runtime, + NULL) +}; + +static struct platform_driver spi_qup_driver = { + .driver = { + .name = "spi_qup", + .pm = &spi_qup_dev_pm_ops, + .of_match_table = spi_qup_dt_match, + }, + .probe = spi_qup_probe, + .remove = spi_qup_remove, +}; +module_platform_driver(spi_qup_driver); + +MODULE_LICENSE("GPL v2"); +MODULE_ALIAS("platform:spi_qup"); diff --git a/drivers/spi/spi-rb4xx.c b/drivers/spi/spi-rb4xx.c new file mode 100644 index 000000000..9f97d18a0 --- /dev/null +++ b/drivers/spi/spi-rb4xx.c @@ -0,0 +1,213 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * SPI controller driver for the Mikrotik RB4xx boards + * + * Copyright (C) 2010 Gabor Juhos <juhosg@openwrt.org> + * Copyright (C) 2015 Bert Vermeulen <bert@biot.com> + * + * This file was based on the patches for Linux 2.6.27.39 published by + * MikroTik for their RouterBoard 4xx series devices. + */ + +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/platform_device.h> +#include <linux/clk.h> +#include <linux/spi/spi.h> +#include <linux/of.h> + +#include <asm/mach-ath79/ar71xx_regs.h> + +struct rb4xx_spi { + void __iomem *base; + struct clk *clk; +}; + +static inline u32 rb4xx_read(struct rb4xx_spi *rbspi, u32 reg) +{ + return __raw_readl(rbspi->base + reg); +} + +static inline void rb4xx_write(struct rb4xx_spi *rbspi, u32 reg, u32 value) +{ + __raw_writel(value, rbspi->base + reg); +} + +static inline void do_spi_clk(struct rb4xx_spi *rbspi, u32 spi_ioc, int value) +{ + u32 regval; + + regval = spi_ioc; + if (value & BIT(0)) + regval |= AR71XX_SPI_IOC_DO; + + rb4xx_write(rbspi, AR71XX_SPI_REG_IOC, regval); + rb4xx_write(rbspi, AR71XX_SPI_REG_IOC, regval | AR71XX_SPI_IOC_CLK); +} + +static void do_spi_byte(struct rb4xx_spi *rbspi, u32 spi_ioc, u8 byte) +{ + int i; + + for (i = 7; i >= 0; i--) + do_spi_clk(rbspi, spi_ioc, byte >> i); +} + +/* The CS2 pin is used to clock in a second bit per clock cycle. */ +static inline void do_spi_clk_two(struct rb4xx_spi *rbspi, u32 spi_ioc, + u8 value) +{ + u32 regval; + + regval = spi_ioc; + if (value & BIT(1)) + regval |= AR71XX_SPI_IOC_DO; + if (value & BIT(0)) + regval |= AR71XX_SPI_IOC_CS2; + + rb4xx_write(rbspi, AR71XX_SPI_REG_IOC, regval); + rb4xx_write(rbspi, AR71XX_SPI_REG_IOC, regval | AR71XX_SPI_IOC_CLK); +} + +/* Two bits at a time, msb first */ +static void do_spi_byte_two(struct rb4xx_spi *rbspi, u32 spi_ioc, u8 byte) +{ + do_spi_clk_two(rbspi, spi_ioc, byte >> 6); + do_spi_clk_two(rbspi, spi_ioc, byte >> 4); + do_spi_clk_two(rbspi, spi_ioc, byte >> 2); + do_spi_clk_two(rbspi, spi_ioc, byte >> 0); +} + +static void rb4xx_set_cs(struct spi_device *spi, bool enable) +{ + struct rb4xx_spi *rbspi = spi_master_get_devdata(spi->master); + + /* + * Setting CS is done along with bitbanging the actual values, + * since it's all on the same hardware register. However the + * CPLD needs CS deselected after every command. + */ + if (enable) + rb4xx_write(rbspi, AR71XX_SPI_REG_IOC, + AR71XX_SPI_IOC_CS0 | AR71XX_SPI_IOC_CS1); +} + +static int rb4xx_transfer_one(struct spi_master *master, + struct spi_device *spi, struct spi_transfer *t) +{ + struct rb4xx_spi *rbspi = spi_master_get_devdata(master); + int i; + u32 spi_ioc; + u8 *rx_buf; + const u8 *tx_buf; + + /* + * Prime the SPI register with the SPI device selected. The m25p80 boot + * flash and CPLD share the CS0 pin. This works because the CPLD's + * command set was designed to almost not clash with that of the + * boot flash. + */ + if (spi->chip_select == 2) + /* MMC */ + spi_ioc = AR71XX_SPI_IOC_CS0; + else + /* Boot flash and CPLD */ + spi_ioc = AR71XX_SPI_IOC_CS1; + + tx_buf = t->tx_buf; + rx_buf = t->rx_buf; + for (i = 0; i < t->len; ++i) { + if (t->tx_nbits == SPI_NBITS_DUAL) + /* CPLD can use two-wire transfers */ + do_spi_byte_two(rbspi, spi_ioc, tx_buf[i]); + else + do_spi_byte(rbspi, spi_ioc, tx_buf[i]); + if (!rx_buf) + continue; + rx_buf[i] = rb4xx_read(rbspi, AR71XX_SPI_REG_RDS); + } + spi_finalize_current_transfer(master); + + return 0; +} + +static int rb4xx_spi_probe(struct platform_device *pdev) +{ + struct spi_master *master; + struct clk *ahb_clk; + struct rb4xx_spi *rbspi; + int err; + void __iomem *spi_base; + + spi_base = devm_platform_ioremap_resource(pdev, 0); + if (IS_ERR(spi_base)) + return PTR_ERR(spi_base); + + master = devm_spi_alloc_master(&pdev->dev, sizeof(*rbspi)); + if (!master) + return -ENOMEM; + + ahb_clk = devm_clk_get(&pdev->dev, "ahb"); + if (IS_ERR(ahb_clk)) + return PTR_ERR(ahb_clk); + + master->dev.of_node = pdev->dev.of_node; + master->bus_num = 0; + master->num_chipselect = 3; + master->mode_bits = SPI_TX_DUAL; + master->bits_per_word_mask = SPI_BPW_MASK(8); + master->flags = SPI_MASTER_MUST_TX; + master->transfer_one = rb4xx_transfer_one; + master->set_cs = rb4xx_set_cs; + + rbspi = spi_master_get_devdata(master); + rbspi->base = spi_base; + rbspi->clk = ahb_clk; + platform_set_drvdata(pdev, rbspi); + + err = devm_spi_register_master(&pdev->dev, master); + if (err) { + dev_err(&pdev->dev, "failed to register SPI master\n"); + return err; + } + + err = clk_prepare_enable(ahb_clk); + if (err) + return err; + + /* Enable SPI */ + rb4xx_write(rbspi, AR71XX_SPI_REG_FS, AR71XX_SPI_FS_GPIO); + + return 0; +} + +static int rb4xx_spi_remove(struct platform_device *pdev) +{ + struct rb4xx_spi *rbspi = platform_get_drvdata(pdev); + + clk_disable_unprepare(rbspi->clk); + + return 0; +} + +static const struct of_device_id rb4xx_spi_dt_match[] = { + { .compatible = "mikrotik,rb4xx-spi" }, + { }, +}; +MODULE_DEVICE_TABLE(of, rb4xx_spi_dt_match); + +static struct platform_driver rb4xx_spi_drv = { + .probe = rb4xx_spi_probe, + .remove = rb4xx_spi_remove, + .driver = { + .name = "rb4xx-spi", + .of_match_table = of_match_ptr(rb4xx_spi_dt_match), + }, +}; + +module_platform_driver(rb4xx_spi_drv); + +MODULE_DESCRIPTION("Mikrotik RB4xx SPI controller driver"); +MODULE_AUTHOR("Gabor Juhos <juhosg@openwrt.org>"); +MODULE_AUTHOR("Bert Vermeulen <bert@biot.com>"); +MODULE_LICENSE("GPL v2"); diff --git a/drivers/spi/spi-rockchip.c b/drivers/spi/spi-rockchip.c new file mode 100644 index 000000000..a9f97023d --- /dev/null +++ b/drivers/spi/spi-rockchip.c @@ -0,0 +1,952 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright (c) 2014, Fuzhou Rockchip Electronics Co., Ltd + * Author: Addy Ke <addy.ke@rock-chips.com> + */ + +#include <linux/clk.h> +#include <linux/dmaengine.h> +#include <linux/interrupt.h> +#include <linux/module.h> +#include <linux/of.h> +#include <linux/pinctrl/consumer.h> +#include <linux/platform_device.h> +#include <linux/spi/spi.h> +#include <linux/pm_runtime.h> +#include <linux/scatterlist.h> + +#define DRIVER_NAME "rockchip-spi" + +#define ROCKCHIP_SPI_CLR_BITS(reg, bits) \ + writel_relaxed(readl_relaxed(reg) & ~(bits), reg) +#define ROCKCHIP_SPI_SET_BITS(reg, bits) \ + writel_relaxed(readl_relaxed(reg) | (bits), reg) + +/* SPI register offsets */ +#define ROCKCHIP_SPI_CTRLR0 0x0000 +#define ROCKCHIP_SPI_CTRLR1 0x0004 +#define ROCKCHIP_SPI_SSIENR 0x0008 +#define ROCKCHIP_SPI_SER 0x000c +#define ROCKCHIP_SPI_BAUDR 0x0010 +#define ROCKCHIP_SPI_TXFTLR 0x0014 +#define ROCKCHIP_SPI_RXFTLR 0x0018 +#define ROCKCHIP_SPI_TXFLR 0x001c +#define ROCKCHIP_SPI_RXFLR 0x0020 +#define ROCKCHIP_SPI_SR 0x0024 +#define ROCKCHIP_SPI_IPR 0x0028 +#define ROCKCHIP_SPI_IMR 0x002c +#define ROCKCHIP_SPI_ISR 0x0030 +#define ROCKCHIP_SPI_RISR 0x0034 +#define ROCKCHIP_SPI_ICR 0x0038 +#define ROCKCHIP_SPI_DMACR 0x003c +#define ROCKCHIP_SPI_DMATDLR 0x0040 +#define ROCKCHIP_SPI_DMARDLR 0x0044 +#define ROCKCHIP_SPI_VERSION 0x0048 +#define ROCKCHIP_SPI_TXDR 0x0400 +#define ROCKCHIP_SPI_RXDR 0x0800 + +/* Bit fields in CTRLR0 */ +#define CR0_DFS_OFFSET 0 +#define CR0_DFS_4BIT 0x0 +#define CR0_DFS_8BIT 0x1 +#define CR0_DFS_16BIT 0x2 + +#define CR0_CFS_OFFSET 2 + +#define CR0_SCPH_OFFSET 6 + +#define CR0_SCPOL_OFFSET 7 + +#define CR0_CSM_OFFSET 8 +#define CR0_CSM_KEEP 0x0 +/* ss_n be high for half sclk_out cycles */ +#define CR0_CSM_HALF 0X1 +/* ss_n be high for one sclk_out cycle */ +#define CR0_CSM_ONE 0x2 + +/* ss_n to sclk_out delay */ +#define CR0_SSD_OFFSET 10 +/* + * The period between ss_n active and + * sclk_out active is half sclk_out cycles + */ +#define CR0_SSD_HALF 0x0 +/* + * The period between ss_n active and + * sclk_out active is one sclk_out cycle + */ +#define CR0_SSD_ONE 0x1 + +#define CR0_EM_OFFSET 11 +#define CR0_EM_LITTLE 0x0 +#define CR0_EM_BIG 0x1 + +#define CR0_FBM_OFFSET 12 +#define CR0_FBM_MSB 0x0 +#define CR0_FBM_LSB 0x1 + +#define CR0_BHT_OFFSET 13 +#define CR0_BHT_16BIT 0x0 +#define CR0_BHT_8BIT 0x1 + +#define CR0_RSD_OFFSET 14 +#define CR0_RSD_MAX 0x3 + +#define CR0_FRF_OFFSET 16 +#define CR0_FRF_SPI 0x0 +#define CR0_FRF_SSP 0x1 +#define CR0_FRF_MICROWIRE 0x2 + +#define CR0_XFM_OFFSET 18 +#define CR0_XFM_MASK (0x03 << SPI_XFM_OFFSET) +#define CR0_XFM_TR 0x0 +#define CR0_XFM_TO 0x1 +#define CR0_XFM_RO 0x2 + +#define CR0_OPM_OFFSET 20 +#define CR0_OPM_MASTER 0x0 +#define CR0_OPM_SLAVE 0x1 + +#define CR0_MTM_OFFSET 0x21 + +/* Bit fields in SER, 2bit */ +#define SER_MASK 0x3 + +/* Bit fields in BAUDR */ +#define BAUDR_SCKDV_MIN 2 +#define BAUDR_SCKDV_MAX 65534 + +/* Bit fields in SR, 5bit */ +#define SR_MASK 0x1f +#define SR_BUSY (1 << 0) +#define SR_TF_FULL (1 << 1) +#define SR_TF_EMPTY (1 << 2) +#define SR_RF_EMPTY (1 << 3) +#define SR_RF_FULL (1 << 4) + +/* Bit fields in ISR, IMR, ISR, RISR, 5bit */ +#define INT_MASK 0x1f +#define INT_TF_EMPTY (1 << 0) +#define INT_TF_OVERFLOW (1 << 1) +#define INT_RF_UNDERFLOW (1 << 2) +#define INT_RF_OVERFLOW (1 << 3) +#define INT_RF_FULL (1 << 4) + +/* Bit fields in ICR, 4bit */ +#define ICR_MASK 0x0f +#define ICR_ALL (1 << 0) +#define ICR_RF_UNDERFLOW (1 << 1) +#define ICR_RF_OVERFLOW (1 << 2) +#define ICR_TF_OVERFLOW (1 << 3) + +/* Bit fields in DMACR */ +#define RF_DMA_EN (1 << 0) +#define TF_DMA_EN (1 << 1) + +/* Driver state flags */ +#define RXDMA (1 << 0) +#define TXDMA (1 << 1) + +/* sclk_out: spi master internal logic in rk3x can support 50Mhz */ +#define MAX_SCLK_OUT 50000000U + +/* + * SPI_CTRLR1 is 16-bits, so we should support lengths of 0xffff + 1. However, + * the controller seems to hang when given 0x10000, so stick with this for now. + */ +#define ROCKCHIP_SPI_MAX_TRANLEN 0xffff + +#define ROCKCHIP_SPI_MAX_CS_NUM 2 +#define ROCKCHIP_SPI_VER2_TYPE1 0x05EC0002 +#define ROCKCHIP_SPI_VER2_TYPE2 0x00110002 + +struct rockchip_spi { + struct device *dev; + + struct clk *spiclk; + struct clk *apb_pclk; + + void __iomem *regs; + dma_addr_t dma_addr_rx; + dma_addr_t dma_addr_tx; + + const void *tx; + void *rx; + unsigned int tx_left; + unsigned int rx_left; + + atomic_t state; + + /*depth of the FIFO buffer */ + u32 fifo_len; + /* frequency of spiclk */ + u32 freq; + + u8 n_bytes; + u8 rsd; + + bool cs_asserted[ROCKCHIP_SPI_MAX_CS_NUM]; + + bool slave_abort; +}; + +static inline void spi_enable_chip(struct rockchip_spi *rs, bool enable) +{ + writel_relaxed((enable ? 1U : 0U), rs->regs + ROCKCHIP_SPI_SSIENR); +} + +static inline void wait_for_idle(struct rockchip_spi *rs) +{ + unsigned long timeout = jiffies + msecs_to_jiffies(5); + + do { + if (!(readl_relaxed(rs->regs + ROCKCHIP_SPI_SR) & SR_BUSY)) + return; + } while (!time_after(jiffies, timeout)); + + dev_warn(rs->dev, "spi controller is in busy state!\n"); +} + +static u32 get_fifo_len(struct rockchip_spi *rs) +{ + u32 ver; + + ver = readl_relaxed(rs->regs + ROCKCHIP_SPI_VERSION); + + switch (ver) { + case ROCKCHIP_SPI_VER2_TYPE1: + case ROCKCHIP_SPI_VER2_TYPE2: + return 64; + default: + return 32; + } +} + +static void rockchip_spi_set_cs(struct spi_device *spi, bool enable) +{ + struct spi_controller *ctlr = spi->controller; + struct rockchip_spi *rs = spi_controller_get_devdata(ctlr); + bool cs_asserted = !enable; + + /* Return immediately for no-op */ + if (cs_asserted == rs->cs_asserted[spi->chip_select]) + return; + + if (cs_asserted) { + /* Keep things powered as long as CS is asserted */ + pm_runtime_get_sync(rs->dev); + + ROCKCHIP_SPI_SET_BITS(rs->regs + ROCKCHIP_SPI_SER, + BIT(spi->chip_select)); + } else { + ROCKCHIP_SPI_CLR_BITS(rs->regs + ROCKCHIP_SPI_SER, + BIT(spi->chip_select)); + + /* Drop reference from when we first asserted CS */ + pm_runtime_put(rs->dev); + } + + rs->cs_asserted[spi->chip_select] = cs_asserted; +} + +static void rockchip_spi_handle_err(struct spi_controller *ctlr, + struct spi_message *msg) +{ + struct rockchip_spi *rs = spi_controller_get_devdata(ctlr); + + /* stop running spi transfer + * this also flushes both rx and tx fifos + */ + spi_enable_chip(rs, false); + + /* make sure all interrupts are masked */ + writel_relaxed(0, rs->regs + ROCKCHIP_SPI_IMR); + + if (atomic_read(&rs->state) & TXDMA) + dmaengine_terminate_async(ctlr->dma_tx); + + if (atomic_read(&rs->state) & RXDMA) + dmaengine_terminate_async(ctlr->dma_rx); +} + +static void rockchip_spi_pio_writer(struct rockchip_spi *rs) +{ + u32 tx_free = rs->fifo_len - readl_relaxed(rs->regs + ROCKCHIP_SPI_TXFLR); + u32 words = min(rs->tx_left, tx_free); + + rs->tx_left -= words; + for (; words; words--) { + u32 txw; + + if (rs->n_bytes == 1) + txw = *(u8 *)rs->tx; + else + txw = *(u16 *)rs->tx; + + writel_relaxed(txw, rs->regs + ROCKCHIP_SPI_TXDR); + rs->tx += rs->n_bytes; + } +} + +static void rockchip_spi_pio_reader(struct rockchip_spi *rs) +{ + u32 words = readl_relaxed(rs->regs + ROCKCHIP_SPI_RXFLR); + u32 rx_left = (rs->rx_left > words) ? rs->rx_left - words : 0; + + /* the hardware doesn't allow us to change fifo threshold + * level while spi is enabled, so instead make sure to leave + * enough words in the rx fifo to get the last interrupt + * exactly when all words have been received + */ + if (rx_left) { + u32 ftl = readl_relaxed(rs->regs + ROCKCHIP_SPI_RXFTLR) + 1; + + if (rx_left < ftl) { + rx_left = ftl; + words = rs->rx_left - rx_left; + } + } + + rs->rx_left = rx_left; + for (; words; words--) { + u32 rxw = readl_relaxed(rs->regs + ROCKCHIP_SPI_RXDR); + + if (!rs->rx) + continue; + + if (rs->n_bytes == 1) + *(u8 *)rs->rx = (u8)rxw; + else + *(u16 *)rs->rx = (u16)rxw; + rs->rx += rs->n_bytes; + } +} + +static irqreturn_t rockchip_spi_isr(int irq, void *dev_id) +{ + struct spi_controller *ctlr = dev_id; + struct rockchip_spi *rs = spi_controller_get_devdata(ctlr); + + if (rs->tx_left) + rockchip_spi_pio_writer(rs); + + rockchip_spi_pio_reader(rs); + if (!rs->rx_left) { + spi_enable_chip(rs, false); + writel_relaxed(0, rs->regs + ROCKCHIP_SPI_IMR); + spi_finalize_current_transfer(ctlr); + } + + return IRQ_HANDLED; +} + +static int rockchip_spi_prepare_irq(struct rockchip_spi *rs, + struct spi_transfer *xfer) +{ + rs->tx = xfer->tx_buf; + rs->rx = xfer->rx_buf; + rs->tx_left = rs->tx ? xfer->len / rs->n_bytes : 0; + rs->rx_left = xfer->len / rs->n_bytes; + + writel_relaxed(INT_RF_FULL, rs->regs + ROCKCHIP_SPI_IMR); + spi_enable_chip(rs, true); + + if (rs->tx_left) + rockchip_spi_pio_writer(rs); + + /* 1 means the transfer is in progress */ + return 1; +} + +static void rockchip_spi_dma_rxcb(void *data) +{ + struct spi_controller *ctlr = data; + struct rockchip_spi *rs = spi_controller_get_devdata(ctlr); + int state = atomic_fetch_andnot(RXDMA, &rs->state); + + if (state & TXDMA && !rs->slave_abort) + return; + + spi_enable_chip(rs, false); + spi_finalize_current_transfer(ctlr); +} + +static void rockchip_spi_dma_txcb(void *data) +{ + struct spi_controller *ctlr = data; + struct rockchip_spi *rs = spi_controller_get_devdata(ctlr); + int state = atomic_fetch_andnot(TXDMA, &rs->state); + + if (state & RXDMA && !rs->slave_abort) + return; + + /* Wait until the FIFO data completely. */ + wait_for_idle(rs); + + spi_enable_chip(rs, false); + spi_finalize_current_transfer(ctlr); +} + +static u32 rockchip_spi_calc_burst_size(u32 data_len) +{ + u32 i; + + /* burst size: 1, 2, 4, 8 */ + for (i = 1; i < 8; i <<= 1) { + if (data_len & i) + break; + } + + return i; +} + +static int rockchip_spi_prepare_dma(struct rockchip_spi *rs, + struct spi_controller *ctlr, struct spi_transfer *xfer) +{ + struct dma_async_tx_descriptor *rxdesc, *txdesc; + + atomic_set(&rs->state, 0); + + rxdesc = NULL; + if (xfer->rx_buf) { + struct dma_slave_config rxconf = { + .direction = DMA_DEV_TO_MEM, + .src_addr = rs->dma_addr_rx, + .src_addr_width = rs->n_bytes, + .src_maxburst = rockchip_spi_calc_burst_size(xfer->len / + rs->n_bytes), + }; + + dmaengine_slave_config(ctlr->dma_rx, &rxconf); + + rxdesc = dmaengine_prep_slave_sg( + ctlr->dma_rx, + xfer->rx_sg.sgl, xfer->rx_sg.nents, + DMA_DEV_TO_MEM, DMA_PREP_INTERRUPT); + if (!rxdesc) + return -EINVAL; + + rxdesc->callback = rockchip_spi_dma_rxcb; + rxdesc->callback_param = ctlr; + } + + txdesc = NULL; + if (xfer->tx_buf) { + struct dma_slave_config txconf = { + .direction = DMA_MEM_TO_DEV, + .dst_addr = rs->dma_addr_tx, + .dst_addr_width = rs->n_bytes, + .dst_maxburst = rs->fifo_len / 4, + }; + + dmaengine_slave_config(ctlr->dma_tx, &txconf); + + txdesc = dmaengine_prep_slave_sg( + ctlr->dma_tx, + xfer->tx_sg.sgl, xfer->tx_sg.nents, + DMA_MEM_TO_DEV, DMA_PREP_INTERRUPT); + if (!txdesc) { + if (rxdesc) + dmaengine_terminate_sync(ctlr->dma_rx); + return -EINVAL; + } + + txdesc->callback = rockchip_spi_dma_txcb; + txdesc->callback_param = ctlr; + } + + /* rx must be started before tx due to spi instinct */ + if (rxdesc) { + atomic_or(RXDMA, &rs->state); + dmaengine_submit(rxdesc); + dma_async_issue_pending(ctlr->dma_rx); + } + + spi_enable_chip(rs, true); + + if (txdesc) { + atomic_or(TXDMA, &rs->state); + dmaengine_submit(txdesc); + dma_async_issue_pending(ctlr->dma_tx); + } + + /* 1 means the transfer is in progress */ + return 1; +} + +static int rockchip_spi_config(struct rockchip_spi *rs, + struct spi_device *spi, struct spi_transfer *xfer, + bool use_dma, bool slave_mode) +{ + u32 cr0 = CR0_FRF_SPI << CR0_FRF_OFFSET + | CR0_BHT_8BIT << CR0_BHT_OFFSET + | CR0_SSD_ONE << CR0_SSD_OFFSET + | CR0_EM_BIG << CR0_EM_OFFSET; + u32 cr1; + u32 dmacr = 0; + + if (slave_mode) + cr0 |= CR0_OPM_SLAVE << CR0_OPM_OFFSET; + rs->slave_abort = false; + + cr0 |= rs->rsd << CR0_RSD_OFFSET; + cr0 |= (spi->mode & 0x3U) << CR0_SCPH_OFFSET; + if (spi->mode & SPI_LSB_FIRST) + cr0 |= CR0_FBM_LSB << CR0_FBM_OFFSET; + + if (xfer->rx_buf && xfer->tx_buf) + cr0 |= CR0_XFM_TR << CR0_XFM_OFFSET; + else if (xfer->rx_buf) + cr0 |= CR0_XFM_RO << CR0_XFM_OFFSET; + else if (use_dma) + cr0 |= CR0_XFM_TO << CR0_XFM_OFFSET; + + switch (xfer->bits_per_word) { + case 4: + cr0 |= CR0_DFS_4BIT << CR0_DFS_OFFSET; + cr1 = xfer->len - 1; + break; + case 8: + cr0 |= CR0_DFS_8BIT << CR0_DFS_OFFSET; + cr1 = xfer->len - 1; + break; + case 16: + cr0 |= CR0_DFS_16BIT << CR0_DFS_OFFSET; + cr1 = xfer->len / 2 - 1; + break; + default: + /* we only whitelist 4, 8 and 16 bit words in + * ctlr->bits_per_word_mask, so this shouldn't + * happen + */ + dev_err(rs->dev, "unknown bits per word: %d\n", + xfer->bits_per_word); + return -EINVAL; + } + + if (use_dma) { + if (xfer->tx_buf) + dmacr |= TF_DMA_EN; + if (xfer->rx_buf) + dmacr |= RF_DMA_EN; + } + + writel_relaxed(cr0, rs->regs + ROCKCHIP_SPI_CTRLR0); + writel_relaxed(cr1, rs->regs + ROCKCHIP_SPI_CTRLR1); + + /* unfortunately setting the fifo threshold level to generate an + * interrupt exactly when the fifo is full doesn't seem to work, + * so we need the strict inequality here + */ + if (xfer->len < rs->fifo_len) + writel_relaxed(xfer->len - 1, rs->regs + ROCKCHIP_SPI_RXFTLR); + else + writel_relaxed(rs->fifo_len / 2 - 1, rs->regs + ROCKCHIP_SPI_RXFTLR); + + writel_relaxed(rs->fifo_len / 2, rs->regs + ROCKCHIP_SPI_DMATDLR); + writel_relaxed(rockchip_spi_calc_burst_size(xfer->len / rs->n_bytes) - 1, + rs->regs + ROCKCHIP_SPI_DMARDLR); + writel_relaxed(dmacr, rs->regs + ROCKCHIP_SPI_DMACR); + + /* the hardware only supports an even clock divisor, so + * round divisor = spiclk / speed up to nearest even number + * so that the resulting speed is <= the requested speed + */ + writel_relaxed(2 * DIV_ROUND_UP(rs->freq, 2 * xfer->speed_hz), + rs->regs + ROCKCHIP_SPI_BAUDR); + + return 0; +} + +static size_t rockchip_spi_max_transfer_size(struct spi_device *spi) +{ + return ROCKCHIP_SPI_MAX_TRANLEN; +} + +static int rockchip_spi_slave_abort(struct spi_controller *ctlr) +{ + struct rockchip_spi *rs = spi_controller_get_devdata(ctlr); + + if (atomic_read(&rs->state) & RXDMA) + dmaengine_terminate_sync(ctlr->dma_rx); + if (atomic_read(&rs->state) & TXDMA) + dmaengine_terminate_sync(ctlr->dma_tx); + atomic_set(&rs->state, 0); + spi_enable_chip(rs, false); + rs->slave_abort = true; + complete(&ctlr->xfer_completion); + + return 0; +} + +static int rockchip_spi_transfer_one( + struct spi_controller *ctlr, + struct spi_device *spi, + struct spi_transfer *xfer) +{ + struct rockchip_spi *rs = spi_controller_get_devdata(ctlr); + int ret; + bool use_dma; + + /* Zero length transfers won't trigger an interrupt on completion */ + if (!xfer->len) { + spi_finalize_current_transfer(ctlr); + return 1; + } + + WARN_ON(readl_relaxed(rs->regs + ROCKCHIP_SPI_SSIENR) && + (readl_relaxed(rs->regs + ROCKCHIP_SPI_SR) & SR_BUSY)); + + if (!xfer->tx_buf && !xfer->rx_buf) { + dev_err(rs->dev, "No buffer for transfer\n"); + return -EINVAL; + } + + if (xfer->len > ROCKCHIP_SPI_MAX_TRANLEN) { + dev_err(rs->dev, "Transfer is too long (%d)\n", xfer->len); + return -EINVAL; + } + + rs->n_bytes = xfer->bits_per_word <= 8 ? 1 : 2; + + use_dma = ctlr->can_dma ? ctlr->can_dma(ctlr, spi, xfer) : false; + + ret = rockchip_spi_config(rs, spi, xfer, use_dma, ctlr->slave); + if (ret) + return ret; + + if (use_dma) + return rockchip_spi_prepare_dma(rs, ctlr, xfer); + + return rockchip_spi_prepare_irq(rs, xfer); +} + +static bool rockchip_spi_can_dma(struct spi_controller *ctlr, + struct spi_device *spi, + struct spi_transfer *xfer) +{ + struct rockchip_spi *rs = spi_controller_get_devdata(ctlr); + unsigned int bytes_per_word = xfer->bits_per_word <= 8 ? 1 : 2; + + /* if the numbor of spi words to transfer is less than the fifo + * length we can just fill the fifo and wait for a single irq, + * so don't bother setting up dma + */ + return xfer->len / bytes_per_word >= rs->fifo_len; +} + +static int rockchip_spi_probe(struct platform_device *pdev) +{ + int ret; + struct rockchip_spi *rs; + struct spi_controller *ctlr; + struct resource *mem; + struct device_node *np = pdev->dev.of_node; + u32 rsd_nsecs, num_cs; + bool slave_mode; + + slave_mode = of_property_read_bool(np, "spi-slave"); + + if (slave_mode) + ctlr = spi_alloc_slave(&pdev->dev, + sizeof(struct rockchip_spi)); + else + ctlr = spi_alloc_master(&pdev->dev, + sizeof(struct rockchip_spi)); + + if (!ctlr) + return -ENOMEM; + + platform_set_drvdata(pdev, ctlr); + + rs = spi_controller_get_devdata(ctlr); + ctlr->slave = slave_mode; + + /* Get basic io resource and map it */ + mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); + rs->regs = devm_ioremap_resource(&pdev->dev, mem); + if (IS_ERR(rs->regs)) { + ret = PTR_ERR(rs->regs); + goto err_put_ctlr; + } + + rs->apb_pclk = devm_clk_get(&pdev->dev, "apb_pclk"); + if (IS_ERR(rs->apb_pclk)) { + dev_err(&pdev->dev, "Failed to get apb_pclk\n"); + ret = PTR_ERR(rs->apb_pclk); + goto err_put_ctlr; + } + + rs->spiclk = devm_clk_get(&pdev->dev, "spiclk"); + if (IS_ERR(rs->spiclk)) { + dev_err(&pdev->dev, "Failed to get spi_pclk\n"); + ret = PTR_ERR(rs->spiclk); + goto err_put_ctlr; + } + + ret = clk_prepare_enable(rs->apb_pclk); + if (ret < 0) { + dev_err(&pdev->dev, "Failed to enable apb_pclk\n"); + goto err_put_ctlr; + } + + ret = clk_prepare_enable(rs->spiclk); + if (ret < 0) { + dev_err(&pdev->dev, "Failed to enable spi_clk\n"); + goto err_disable_apbclk; + } + + spi_enable_chip(rs, false); + + ret = platform_get_irq(pdev, 0); + if (ret < 0) + goto err_disable_spiclk; + + ret = devm_request_threaded_irq(&pdev->dev, ret, rockchip_spi_isr, NULL, + IRQF_ONESHOT, dev_name(&pdev->dev), ctlr); + if (ret) + goto err_disable_spiclk; + + rs->dev = &pdev->dev; + rs->freq = clk_get_rate(rs->spiclk); + + if (!of_property_read_u32(pdev->dev.of_node, "rx-sample-delay-ns", + &rsd_nsecs)) { + /* rx sample delay is expressed in parent clock cycles (max 3) */ + u32 rsd = DIV_ROUND_CLOSEST(rsd_nsecs * (rs->freq >> 8), + 1000000000 >> 8); + if (!rsd) { + dev_warn(rs->dev, "%u Hz are too slow to express %u ns delay\n", + rs->freq, rsd_nsecs); + } else if (rsd > CR0_RSD_MAX) { + rsd = CR0_RSD_MAX; + dev_warn(rs->dev, "%u Hz are too fast to express %u ns delay, clamping at %u ns\n", + rs->freq, rsd_nsecs, + CR0_RSD_MAX * 1000000000U / rs->freq); + } + rs->rsd = rsd; + } + + rs->fifo_len = get_fifo_len(rs); + if (!rs->fifo_len) { + dev_err(&pdev->dev, "Failed to get fifo length\n"); + ret = -EINVAL; + goto err_disable_spiclk; + } + + pm_runtime_set_active(&pdev->dev); + pm_runtime_enable(&pdev->dev); + + ctlr->auto_runtime_pm = true; + ctlr->bus_num = pdev->id; + ctlr->mode_bits = SPI_CPOL | SPI_CPHA | SPI_LOOP | SPI_LSB_FIRST; + if (slave_mode) { + ctlr->mode_bits |= SPI_NO_CS; + ctlr->slave_abort = rockchip_spi_slave_abort; + } else { + ctlr->flags = SPI_MASTER_GPIO_SS; + ctlr->max_native_cs = ROCKCHIP_SPI_MAX_CS_NUM; + /* + * rk spi0 has two native cs, spi1..5 one cs only + * if num-cs is missing in the dts, default to 1 + */ + if (of_property_read_u32(np, "num-cs", &num_cs)) + num_cs = 1; + ctlr->num_chipselect = num_cs; + ctlr->use_gpio_descriptors = true; + } + ctlr->dev.of_node = pdev->dev.of_node; + ctlr->bits_per_word_mask = SPI_BPW_MASK(16) | SPI_BPW_MASK(8) | SPI_BPW_MASK(4); + ctlr->min_speed_hz = rs->freq / BAUDR_SCKDV_MAX; + ctlr->max_speed_hz = min(rs->freq / BAUDR_SCKDV_MIN, MAX_SCLK_OUT); + + ctlr->set_cs = rockchip_spi_set_cs; + ctlr->transfer_one = rockchip_spi_transfer_one; + ctlr->max_transfer_size = rockchip_spi_max_transfer_size; + ctlr->handle_err = rockchip_spi_handle_err; + + ctlr->dma_tx = dma_request_chan(rs->dev, "tx"); + if (IS_ERR(ctlr->dma_tx)) { + /* Check tx to see if we need defer probing driver */ + if (PTR_ERR(ctlr->dma_tx) == -EPROBE_DEFER) { + ret = -EPROBE_DEFER; + goto err_disable_pm_runtime; + } + dev_warn(rs->dev, "Failed to request TX DMA channel\n"); + ctlr->dma_tx = NULL; + } + + ctlr->dma_rx = dma_request_chan(rs->dev, "rx"); + if (IS_ERR(ctlr->dma_rx)) { + if (PTR_ERR(ctlr->dma_rx) == -EPROBE_DEFER) { + ret = -EPROBE_DEFER; + goto err_free_dma_tx; + } + dev_warn(rs->dev, "Failed to request RX DMA channel\n"); + ctlr->dma_rx = NULL; + } + + if (ctlr->dma_tx && ctlr->dma_rx) { + rs->dma_addr_tx = mem->start + ROCKCHIP_SPI_TXDR; + rs->dma_addr_rx = mem->start + ROCKCHIP_SPI_RXDR; + ctlr->can_dma = rockchip_spi_can_dma; + } + + ret = devm_spi_register_controller(&pdev->dev, ctlr); + if (ret < 0) { + dev_err(&pdev->dev, "Failed to register controller\n"); + goto err_free_dma_rx; + } + + return 0; + +err_free_dma_rx: + if (ctlr->dma_rx) + dma_release_channel(ctlr->dma_rx); +err_free_dma_tx: + if (ctlr->dma_tx) + dma_release_channel(ctlr->dma_tx); +err_disable_pm_runtime: + pm_runtime_disable(&pdev->dev); +err_disable_spiclk: + clk_disable_unprepare(rs->spiclk); +err_disable_apbclk: + clk_disable_unprepare(rs->apb_pclk); +err_put_ctlr: + spi_controller_put(ctlr); + + return ret; +} + +static int rockchip_spi_remove(struct platform_device *pdev) +{ + struct spi_controller *ctlr = spi_controller_get(platform_get_drvdata(pdev)); + struct rockchip_spi *rs = spi_controller_get_devdata(ctlr); + + pm_runtime_get_sync(&pdev->dev); + + clk_disable_unprepare(rs->spiclk); + clk_disable_unprepare(rs->apb_pclk); + + pm_runtime_put_noidle(&pdev->dev); + pm_runtime_disable(&pdev->dev); + pm_runtime_set_suspended(&pdev->dev); + + if (ctlr->dma_tx) + dma_release_channel(ctlr->dma_tx); + if (ctlr->dma_rx) + dma_release_channel(ctlr->dma_rx); + + spi_controller_put(ctlr); + + return 0; +} + +#ifdef CONFIG_PM_SLEEP +static int rockchip_spi_suspend(struct device *dev) +{ + int ret; + struct spi_controller *ctlr = dev_get_drvdata(dev); + + ret = spi_controller_suspend(ctlr); + if (ret < 0) + return ret; + + ret = pm_runtime_force_suspend(dev); + if (ret < 0) + return ret; + + pinctrl_pm_select_sleep_state(dev); + + return 0; +} + +static int rockchip_spi_resume(struct device *dev) +{ + int ret; + struct spi_controller *ctlr = dev_get_drvdata(dev); + struct rockchip_spi *rs = spi_controller_get_devdata(ctlr); + + pinctrl_pm_select_default_state(dev); + + ret = pm_runtime_force_resume(dev); + if (ret < 0) + return ret; + + ret = spi_controller_resume(ctlr); + if (ret < 0) { + clk_disable_unprepare(rs->spiclk); + clk_disable_unprepare(rs->apb_pclk); + } + + return 0; +} +#endif /* CONFIG_PM_SLEEP */ + +#ifdef CONFIG_PM +static int rockchip_spi_runtime_suspend(struct device *dev) +{ + struct spi_controller *ctlr = dev_get_drvdata(dev); + struct rockchip_spi *rs = spi_controller_get_devdata(ctlr); + + clk_disable_unprepare(rs->spiclk); + clk_disable_unprepare(rs->apb_pclk); + + return 0; +} + +static int rockchip_spi_runtime_resume(struct device *dev) +{ + int ret; + struct spi_controller *ctlr = dev_get_drvdata(dev); + struct rockchip_spi *rs = spi_controller_get_devdata(ctlr); + + ret = clk_prepare_enable(rs->apb_pclk); + if (ret < 0) + return ret; + + ret = clk_prepare_enable(rs->spiclk); + if (ret < 0) + clk_disable_unprepare(rs->apb_pclk); + + return 0; +} +#endif /* CONFIG_PM */ + +static const struct dev_pm_ops rockchip_spi_pm = { + SET_SYSTEM_SLEEP_PM_OPS(rockchip_spi_suspend, rockchip_spi_resume) + SET_RUNTIME_PM_OPS(rockchip_spi_runtime_suspend, + rockchip_spi_runtime_resume, NULL) +}; + +static const struct of_device_id rockchip_spi_dt_match[] = { + { .compatible = "rockchip,px30-spi", }, + { .compatible = "rockchip,rk3036-spi", }, + { .compatible = "rockchip,rk3066-spi", }, + { .compatible = "rockchip,rk3188-spi", }, + { .compatible = "rockchip,rk3228-spi", }, + { .compatible = "rockchip,rk3288-spi", }, + { .compatible = "rockchip,rk3308-spi", }, + { .compatible = "rockchip,rk3328-spi", }, + { .compatible = "rockchip,rk3368-spi", }, + { .compatible = "rockchip,rk3399-spi", }, + { .compatible = "rockchip,rv1108-spi", }, + { }, +}; +MODULE_DEVICE_TABLE(of, rockchip_spi_dt_match); + +static struct platform_driver rockchip_spi_driver = { + .driver = { + .name = DRIVER_NAME, + .pm = &rockchip_spi_pm, + .of_match_table = of_match_ptr(rockchip_spi_dt_match), + }, + .probe = rockchip_spi_probe, + .remove = rockchip_spi_remove, +}; + +module_platform_driver(rockchip_spi_driver); + +MODULE_AUTHOR("Addy Ke <addy.ke@rock-chips.com>"); +MODULE_DESCRIPTION("ROCKCHIP SPI Controller Driver"); +MODULE_LICENSE("GPL v2"); diff --git a/drivers/spi/spi-rpc-if.c b/drivers/spi/spi-rpc-if.c new file mode 100644 index 000000000..727d7cf0a --- /dev/null +++ b/drivers/spi/spi-rpc-if.c @@ -0,0 +1,213 @@ +// SPDX-License-Identifier: GPL-2.0 +// +// RPC-IF SPI/QSPI/Octa driver +// +// Copyright (C) 2018 ~ 2019 Renesas Solutions Corp. +// Copyright (C) 2019 Macronix International Co., Ltd. +// Copyright (C) 2019 - 2020 Cogent Embedded, Inc. +// + +#include <linux/module.h> +#include <linux/platform_device.h> +#include <linux/spi/spi.h> +#include <linux/spi/spi-mem.h> + +#include <memory/renesas-rpc-if.h> + +#include <asm/unaligned.h> + +static void rpcif_spi_mem_prepare(struct spi_device *spi_dev, + const struct spi_mem_op *spi_op, + u64 *offs, size_t *len) +{ + struct rpcif *rpc = spi_controller_get_devdata(spi_dev->controller); + struct rpcif_op rpc_op = { }; + + rpc_op.cmd.opcode = spi_op->cmd.opcode; + rpc_op.cmd.buswidth = spi_op->cmd.buswidth; + + if (spi_op->addr.nbytes) { + rpc_op.addr.buswidth = spi_op->addr.buswidth; + rpc_op.addr.nbytes = spi_op->addr.nbytes; + rpc_op.addr.val = spi_op->addr.val; + } + + if (spi_op->dummy.nbytes) { + rpc_op.dummy.buswidth = spi_op->dummy.buswidth; + rpc_op.dummy.ncycles = spi_op->dummy.nbytes * 8 / + spi_op->dummy.buswidth; + } + + if (spi_op->data.nbytes || (offs && len)) { + rpc_op.data.buswidth = spi_op->data.buswidth; + rpc_op.data.nbytes = spi_op->data.nbytes; + switch (spi_op->data.dir) { + case SPI_MEM_DATA_IN: + rpc_op.data.dir = RPCIF_DATA_IN; + rpc_op.data.buf.in = spi_op->data.buf.in; + break; + case SPI_MEM_DATA_OUT: + rpc_op.data.dir = RPCIF_DATA_OUT; + rpc_op.data.buf.out = spi_op->data.buf.out; + break; + case SPI_MEM_NO_DATA: + rpc_op.data.dir = RPCIF_NO_DATA; + break; + } + } else { + rpc_op.data.dir = RPCIF_NO_DATA; + } + + rpcif_prepare(rpc, &rpc_op, offs, len); +} + +static bool rpcif_spi_mem_supports_op(struct spi_mem *mem, + const struct spi_mem_op *op) +{ + if (!spi_mem_default_supports_op(mem, op)) + return false; + + if (op->data.buswidth > 4 || op->addr.buswidth > 4 || + op->dummy.buswidth > 4 || op->cmd.buswidth > 4 || + op->addr.nbytes > 4) + return false; + + return true; +} + +static ssize_t rpcif_spi_mem_dirmap_read(struct spi_mem_dirmap_desc *desc, + u64 offs, size_t len, void *buf) +{ + struct rpcif *rpc = + spi_controller_get_devdata(desc->mem->spi->controller); + + if (offs + desc->info.offset + len > U32_MAX) + return -EINVAL; + + rpcif_spi_mem_prepare(desc->mem->spi, &desc->info.op_tmpl, &offs, &len); + + return rpcif_dirmap_read(rpc, offs, len, buf); +} + +static int rpcif_spi_mem_dirmap_create(struct spi_mem_dirmap_desc *desc) +{ + struct rpcif *rpc = + spi_controller_get_devdata(desc->mem->spi->controller); + + if (desc->info.offset + desc->info.length > U32_MAX) + return -ENOTSUPP; + + if (!rpcif_spi_mem_supports_op(desc->mem, &desc->info.op_tmpl)) + return -ENOTSUPP; + + if (!rpc->dirmap && desc->info.op_tmpl.data.dir == SPI_MEM_DATA_IN) + return -ENOTSUPP; + + if (desc->info.op_tmpl.data.dir == SPI_MEM_DATA_OUT) + return -ENOTSUPP; + + return 0; +} + +static int rpcif_spi_mem_exec_op(struct spi_mem *mem, + const struct spi_mem_op *op) +{ + struct rpcif *rpc = + spi_controller_get_devdata(mem->spi->controller); + + rpcif_spi_mem_prepare(mem->spi, op, NULL, NULL); + + return rpcif_manual_xfer(rpc); +} + +static const struct spi_controller_mem_ops rpcif_spi_mem_ops = { + .supports_op = rpcif_spi_mem_supports_op, + .exec_op = rpcif_spi_mem_exec_op, + .dirmap_create = rpcif_spi_mem_dirmap_create, + .dirmap_read = rpcif_spi_mem_dirmap_read, +}; + +static int rpcif_spi_probe(struct platform_device *pdev) +{ + struct device *parent = pdev->dev.parent; + struct spi_controller *ctlr; + struct rpcif *rpc; + int error; + + ctlr = devm_spi_alloc_master(&pdev->dev, sizeof(*rpc)); + if (!ctlr) + return -ENOMEM; + + rpc = spi_controller_get_devdata(ctlr); + error = rpcif_sw_init(rpc, parent); + if (error) + return error; + + platform_set_drvdata(pdev, ctlr); + + ctlr->dev.of_node = parent->of_node; + + rpcif_enable_rpm(rpc); + + ctlr->num_chipselect = 1; + ctlr->mem_ops = &rpcif_spi_mem_ops; + + ctlr->bits_per_word_mask = SPI_BPW_MASK(8); + ctlr->mode_bits = SPI_CPOL | SPI_CPHA | SPI_TX_QUAD | SPI_RX_QUAD; + ctlr->flags = SPI_CONTROLLER_HALF_DUPLEX; + + rpcif_hw_init(rpc, false); + + error = spi_register_controller(ctlr); + if (error) { + dev_err(&pdev->dev, "spi_register_controller failed\n"); + rpcif_disable_rpm(rpc); + } + + return error; +} + +static int rpcif_spi_remove(struct platform_device *pdev) +{ + struct spi_controller *ctlr = platform_get_drvdata(pdev); + struct rpcif *rpc = spi_controller_get_devdata(ctlr); + + spi_unregister_controller(ctlr); + rpcif_disable_rpm(rpc); + + return 0; +} + +#ifdef CONFIG_PM_SLEEP +static int rpcif_spi_suspend(struct device *dev) +{ + struct spi_controller *ctlr = dev_get_drvdata(dev); + + return spi_controller_suspend(ctlr); +} + +static int rpcif_spi_resume(struct device *dev) +{ + struct spi_controller *ctlr = dev_get_drvdata(dev); + + return spi_controller_resume(ctlr); +} + +static SIMPLE_DEV_PM_OPS(rpcif_spi_pm_ops, rpcif_spi_suspend, rpcif_spi_resume); +#define DEV_PM_OPS (&rpcif_spi_pm_ops) +#else +#define DEV_PM_OPS NULL +#endif + +static struct platform_driver rpcif_spi_driver = { + .probe = rpcif_spi_probe, + .remove = rpcif_spi_remove, + .driver = { + .name = "rpc-if-spi", + .pm = DEV_PM_OPS, + }, +}; +module_platform_driver(rpcif_spi_driver); + +MODULE_DESCRIPTION("Renesas RPC-IF SPI driver"); +MODULE_LICENSE("GPL v2"); diff --git a/drivers/spi/spi-rspi.c b/drivers/spi/spi-rspi.c new file mode 100644 index 000000000..4600e3c9e --- /dev/null +++ b/drivers/spi/spi-rspi.c @@ -0,0 +1,1431 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * SH RSPI driver + * + * Copyright (C) 2012, 2013 Renesas Solutions Corp. + * Copyright (C) 2014 Glider bvba + * + * Based on spi-sh.c: + * Copyright (C) 2011 Renesas Solutions Corp. + */ + +#include <linux/module.h> +#include <linux/kernel.h> +#include <linux/sched.h> +#include <linux/errno.h> +#include <linux/interrupt.h> +#include <linux/platform_device.h> +#include <linux/io.h> +#include <linux/clk.h> +#include <linux/dmaengine.h> +#include <linux/dma-mapping.h> +#include <linux/of_device.h> +#include <linux/pm_runtime.h> +#include <linux/sh_dma.h> +#include <linux/spi/spi.h> +#include <linux/spi/rspi.h> +#include <linux/spinlock.h> + +#define RSPI_SPCR 0x00 /* Control Register */ +#define RSPI_SSLP 0x01 /* Slave Select Polarity Register */ +#define RSPI_SPPCR 0x02 /* Pin Control Register */ +#define RSPI_SPSR 0x03 /* Status Register */ +#define RSPI_SPDR 0x04 /* Data Register */ +#define RSPI_SPSCR 0x08 /* Sequence Control Register */ +#define RSPI_SPSSR 0x09 /* Sequence Status Register */ +#define RSPI_SPBR 0x0a /* Bit Rate Register */ +#define RSPI_SPDCR 0x0b /* Data Control Register */ +#define RSPI_SPCKD 0x0c /* Clock Delay Register */ +#define RSPI_SSLND 0x0d /* Slave Select Negation Delay Register */ +#define RSPI_SPND 0x0e /* Next-Access Delay Register */ +#define RSPI_SPCR2 0x0f /* Control Register 2 (SH only) */ +#define RSPI_SPCMD0 0x10 /* Command Register 0 */ +#define RSPI_SPCMD1 0x12 /* Command Register 1 */ +#define RSPI_SPCMD2 0x14 /* Command Register 2 */ +#define RSPI_SPCMD3 0x16 /* Command Register 3 */ +#define RSPI_SPCMD4 0x18 /* Command Register 4 */ +#define RSPI_SPCMD5 0x1a /* Command Register 5 */ +#define RSPI_SPCMD6 0x1c /* Command Register 6 */ +#define RSPI_SPCMD7 0x1e /* Command Register 7 */ +#define RSPI_SPCMD(i) (RSPI_SPCMD0 + (i) * 2) +#define RSPI_NUM_SPCMD 8 +#define RSPI_RZ_NUM_SPCMD 4 +#define QSPI_NUM_SPCMD 4 + +/* RSPI on RZ only */ +#define RSPI_SPBFCR 0x20 /* Buffer Control Register */ +#define RSPI_SPBFDR 0x22 /* Buffer Data Count Setting Register */ + +/* QSPI only */ +#define QSPI_SPBFCR 0x18 /* Buffer Control Register */ +#define QSPI_SPBDCR 0x1a /* Buffer Data Count Register */ +#define QSPI_SPBMUL0 0x1c /* Transfer Data Length Multiplier Setting Register 0 */ +#define QSPI_SPBMUL1 0x20 /* Transfer Data Length Multiplier Setting Register 1 */ +#define QSPI_SPBMUL2 0x24 /* Transfer Data Length Multiplier Setting Register 2 */ +#define QSPI_SPBMUL3 0x28 /* Transfer Data Length Multiplier Setting Register 3 */ +#define QSPI_SPBMUL(i) (QSPI_SPBMUL0 + (i) * 4) + +/* SPCR - Control Register */ +#define SPCR_SPRIE 0x80 /* Receive Interrupt Enable */ +#define SPCR_SPE 0x40 /* Function Enable */ +#define SPCR_SPTIE 0x20 /* Transmit Interrupt Enable */ +#define SPCR_SPEIE 0x10 /* Error Interrupt Enable */ +#define SPCR_MSTR 0x08 /* Master/Slave Mode Select */ +#define SPCR_MODFEN 0x04 /* Mode Fault Error Detection Enable */ +/* RSPI on SH only */ +#define SPCR_TXMD 0x02 /* TX Only Mode (vs. Full Duplex) */ +#define SPCR_SPMS 0x01 /* 3-wire Mode (vs. 4-wire) */ +/* QSPI on R-Car Gen2 only */ +#define SPCR_WSWAP 0x02 /* Word Swap of read-data for DMAC */ +#define SPCR_BSWAP 0x01 /* Byte Swap of read-data for DMAC */ + +/* SSLP - Slave Select Polarity Register */ +#define SSLP_SSLP(i) BIT(i) /* SSLi Signal Polarity Setting */ + +/* SPPCR - Pin Control Register */ +#define SPPCR_MOIFE 0x20 /* MOSI Idle Value Fixing Enable */ +#define SPPCR_MOIFV 0x10 /* MOSI Idle Fixed Value */ +#define SPPCR_SPOM 0x04 +#define SPPCR_SPLP2 0x02 /* Loopback Mode 2 (non-inverting) */ +#define SPPCR_SPLP 0x01 /* Loopback Mode (inverting) */ + +#define SPPCR_IO3FV 0x04 /* Single-/Dual-SPI Mode IO3 Output Fixed Value */ +#define SPPCR_IO2FV 0x04 /* Single-/Dual-SPI Mode IO2 Output Fixed Value */ + +/* SPSR - Status Register */ +#define SPSR_SPRF 0x80 /* Receive Buffer Full Flag */ +#define SPSR_TEND 0x40 /* Transmit End */ +#define SPSR_SPTEF 0x20 /* Transmit Buffer Empty Flag */ +#define SPSR_PERF 0x08 /* Parity Error Flag */ +#define SPSR_MODF 0x04 /* Mode Fault Error Flag */ +#define SPSR_IDLNF 0x02 /* RSPI Idle Flag */ +#define SPSR_OVRF 0x01 /* Overrun Error Flag (RSPI only) */ + +/* SPSCR - Sequence Control Register */ +#define SPSCR_SPSLN_MASK 0x07 /* Sequence Length Specification */ + +/* SPSSR - Sequence Status Register */ +#define SPSSR_SPECM_MASK 0x70 /* Command Error Mask */ +#define SPSSR_SPCP_MASK 0x07 /* Command Pointer Mask */ + +/* SPDCR - Data Control Register */ +#define SPDCR_TXDMY 0x80 /* Dummy Data Transmission Enable */ +#define SPDCR_SPLW1 0x40 /* Access Width Specification (RZ) */ +#define SPDCR_SPLW0 0x20 /* Access Width Specification (RZ) */ +#define SPDCR_SPLLWORD (SPDCR_SPLW1 | SPDCR_SPLW0) +#define SPDCR_SPLWORD SPDCR_SPLW1 +#define SPDCR_SPLBYTE SPDCR_SPLW0 +#define SPDCR_SPLW 0x20 /* Access Width Specification (SH) */ +#define SPDCR_SPRDTD 0x10 /* Receive Transmit Data Select (SH) */ +#define SPDCR_SLSEL1 0x08 +#define SPDCR_SLSEL0 0x04 +#define SPDCR_SLSEL_MASK 0x0c /* SSL1 Output Select (SH) */ +#define SPDCR_SPFC1 0x02 +#define SPDCR_SPFC0 0x01 +#define SPDCR_SPFC_MASK 0x03 /* Frame Count Setting (1-4) (SH) */ + +/* SPCKD - Clock Delay Register */ +#define SPCKD_SCKDL_MASK 0x07 /* Clock Delay Setting (1-8) */ + +/* SSLND - Slave Select Negation Delay Register */ +#define SSLND_SLNDL_MASK 0x07 /* SSL Negation Delay Setting (1-8) */ + +/* SPND - Next-Access Delay Register */ +#define SPND_SPNDL_MASK 0x07 /* Next-Access Delay Setting (1-8) */ + +/* SPCR2 - Control Register 2 */ +#define SPCR2_PTE 0x08 /* Parity Self-Test Enable */ +#define SPCR2_SPIE 0x04 /* Idle Interrupt Enable */ +#define SPCR2_SPOE 0x02 /* Odd Parity Enable (vs. Even) */ +#define SPCR2_SPPE 0x01 /* Parity Enable */ + +/* SPCMDn - Command Registers */ +#define SPCMD_SCKDEN 0x8000 /* Clock Delay Setting Enable */ +#define SPCMD_SLNDEN 0x4000 /* SSL Negation Delay Setting Enable */ +#define SPCMD_SPNDEN 0x2000 /* Next-Access Delay Enable */ +#define SPCMD_LSBF 0x1000 /* LSB First */ +#define SPCMD_SPB_MASK 0x0f00 /* Data Length Setting */ +#define SPCMD_SPB_8_TO_16(bit) (((bit - 1) << 8) & SPCMD_SPB_MASK) +#define SPCMD_SPB_8BIT 0x0000 /* QSPI only */ +#define SPCMD_SPB_16BIT 0x0100 +#define SPCMD_SPB_20BIT 0x0000 +#define SPCMD_SPB_24BIT 0x0100 +#define SPCMD_SPB_32BIT 0x0200 +#define SPCMD_SSLKP 0x0080 /* SSL Signal Level Keeping */ +#define SPCMD_SPIMOD_MASK 0x0060 /* SPI Operating Mode (QSPI only) */ +#define SPCMD_SPIMOD1 0x0040 +#define SPCMD_SPIMOD0 0x0020 +#define SPCMD_SPIMOD_SINGLE 0 +#define SPCMD_SPIMOD_DUAL SPCMD_SPIMOD0 +#define SPCMD_SPIMOD_QUAD SPCMD_SPIMOD1 +#define SPCMD_SPRW 0x0010 /* SPI Read/Write Access (Dual/Quad) */ +#define SPCMD_SSLA(i) ((i) << 4) /* SSL Assert Signal Setting */ +#define SPCMD_BRDV_MASK 0x000c /* Bit Rate Division Setting */ +#define SPCMD_BRDV(brdv) ((brdv) << 2) +#define SPCMD_CPOL 0x0002 /* Clock Polarity Setting */ +#define SPCMD_CPHA 0x0001 /* Clock Phase Setting */ + +/* SPBFCR - Buffer Control Register */ +#define SPBFCR_TXRST 0x80 /* Transmit Buffer Data Reset */ +#define SPBFCR_RXRST 0x40 /* Receive Buffer Data Reset */ +#define SPBFCR_TXTRG_MASK 0x30 /* Transmit Buffer Data Triggering Number */ +#define SPBFCR_RXTRG_MASK 0x07 /* Receive Buffer Data Triggering Number */ +/* QSPI on R-Car Gen2 */ +#define SPBFCR_TXTRG_1B 0x00 /* 31 bytes (1 byte available) */ +#define SPBFCR_TXTRG_32B 0x30 /* 0 byte (32 bytes available) */ +#define SPBFCR_RXTRG_1B 0x00 /* 1 byte (31 bytes available) */ +#define SPBFCR_RXTRG_32B 0x07 /* 32 bytes (0 byte available) */ + +#define QSPI_BUFFER_SIZE 32u + +struct rspi_data { + void __iomem *addr; + u32 speed_hz; + struct spi_controller *ctlr; + struct platform_device *pdev; + wait_queue_head_t wait; + spinlock_t lock; /* Protects RMW-access to RSPI_SSLP */ + struct clk *clk; + u16 spcmd; + u8 spsr; + u8 sppcr; + int rx_irq, tx_irq; + const struct spi_ops *ops; + + unsigned dma_callbacked:1; + unsigned byte_access:1; +}; + +static void rspi_write8(const struct rspi_data *rspi, u8 data, u16 offset) +{ + iowrite8(data, rspi->addr + offset); +} + +static void rspi_write16(const struct rspi_data *rspi, u16 data, u16 offset) +{ + iowrite16(data, rspi->addr + offset); +} + +static void rspi_write32(const struct rspi_data *rspi, u32 data, u16 offset) +{ + iowrite32(data, rspi->addr + offset); +} + +static u8 rspi_read8(const struct rspi_data *rspi, u16 offset) +{ + return ioread8(rspi->addr + offset); +} + +static u16 rspi_read16(const struct rspi_data *rspi, u16 offset) +{ + return ioread16(rspi->addr + offset); +} + +static void rspi_write_data(const struct rspi_data *rspi, u16 data) +{ + if (rspi->byte_access) + rspi_write8(rspi, data, RSPI_SPDR); + else /* 16 bit */ + rspi_write16(rspi, data, RSPI_SPDR); +} + +static u16 rspi_read_data(const struct rspi_data *rspi) +{ + if (rspi->byte_access) + return rspi_read8(rspi, RSPI_SPDR); + else /* 16 bit */ + return rspi_read16(rspi, RSPI_SPDR); +} + +/* optional functions */ +struct spi_ops { + int (*set_config_register)(struct rspi_data *rspi, int access_size); + int (*transfer_one)(struct spi_controller *ctlr, + struct spi_device *spi, struct spi_transfer *xfer); + u16 extra_mode_bits; + u16 min_div; + u16 max_div; + u16 flags; + u16 fifo_size; + u8 num_hw_ss; +}; + +static void rspi_set_rate(struct rspi_data *rspi) +{ + unsigned long clksrc; + int brdv = 0, spbr; + + clksrc = clk_get_rate(rspi->clk); + spbr = DIV_ROUND_UP(clksrc, 2 * rspi->speed_hz) - 1; + while (spbr > 255 && brdv < 3) { + brdv++; + spbr = DIV_ROUND_UP(spbr + 1, 2) - 1; + } + + rspi_write8(rspi, clamp(spbr, 0, 255), RSPI_SPBR); + rspi->spcmd |= SPCMD_BRDV(brdv); + rspi->speed_hz = DIV_ROUND_UP(clksrc, (2U << brdv) * (spbr + 1)); +} + +/* + * functions for RSPI on legacy SH + */ +static int rspi_set_config_register(struct rspi_data *rspi, int access_size) +{ + /* Sets output mode, MOSI signal, and (optionally) loopback */ + rspi_write8(rspi, rspi->sppcr, RSPI_SPPCR); + + /* Sets transfer bit rate */ + rspi_set_rate(rspi); + + /* Disable dummy transmission, set 16-bit word access, 1 frame */ + rspi_write8(rspi, 0, RSPI_SPDCR); + rspi->byte_access = 0; + + /* Sets RSPCK, SSL, next-access delay value */ + rspi_write8(rspi, 0x00, RSPI_SPCKD); + rspi_write8(rspi, 0x00, RSPI_SSLND); + rspi_write8(rspi, 0x00, RSPI_SPND); + + /* Sets parity, interrupt mask */ + rspi_write8(rspi, 0x00, RSPI_SPCR2); + + /* Resets sequencer */ + rspi_write8(rspi, 0, RSPI_SPSCR); + rspi->spcmd |= SPCMD_SPB_8_TO_16(access_size); + rspi_write16(rspi, rspi->spcmd, RSPI_SPCMD0); + + /* Sets RSPI mode */ + rspi_write8(rspi, SPCR_MSTR, RSPI_SPCR); + + return 0; +} + +/* + * functions for RSPI on RZ + */ +static int rspi_rz_set_config_register(struct rspi_data *rspi, int access_size) +{ + /* Sets output mode, MOSI signal, and (optionally) loopback */ + rspi_write8(rspi, rspi->sppcr, RSPI_SPPCR); + + /* Sets transfer bit rate */ + rspi_set_rate(rspi); + + /* Disable dummy transmission, set byte access */ + rspi_write8(rspi, SPDCR_SPLBYTE, RSPI_SPDCR); + rspi->byte_access = 1; + + /* Sets RSPCK, SSL, next-access delay value */ + rspi_write8(rspi, 0x00, RSPI_SPCKD); + rspi_write8(rspi, 0x00, RSPI_SSLND); + rspi_write8(rspi, 0x00, RSPI_SPND); + + /* Resets sequencer */ + rspi_write8(rspi, 0, RSPI_SPSCR); + rspi->spcmd |= SPCMD_SPB_8_TO_16(access_size); + rspi_write16(rspi, rspi->spcmd, RSPI_SPCMD0); + + /* Sets RSPI mode */ + rspi_write8(rspi, SPCR_MSTR, RSPI_SPCR); + + return 0; +} + +/* + * functions for QSPI + */ +static int qspi_set_config_register(struct rspi_data *rspi, int access_size) +{ + unsigned long clksrc; + int brdv = 0, spbr; + + /* Sets output mode, MOSI signal, and (optionally) loopback */ + rspi_write8(rspi, rspi->sppcr, RSPI_SPPCR); + + /* Sets transfer bit rate */ + clksrc = clk_get_rate(rspi->clk); + if (rspi->speed_hz >= clksrc) { + spbr = 0; + rspi->speed_hz = clksrc; + } else { + spbr = DIV_ROUND_UP(clksrc, 2 * rspi->speed_hz); + while (spbr > 255 && brdv < 3) { + brdv++; + spbr = DIV_ROUND_UP(spbr, 2); + } + spbr = clamp(spbr, 0, 255); + rspi->speed_hz = DIV_ROUND_UP(clksrc, (2U << brdv) * spbr); + } + rspi_write8(rspi, spbr, RSPI_SPBR); + rspi->spcmd |= SPCMD_BRDV(brdv); + + /* Disable dummy transmission, set byte access */ + rspi_write8(rspi, 0, RSPI_SPDCR); + rspi->byte_access = 1; + + /* Sets RSPCK, SSL, next-access delay value */ + rspi_write8(rspi, 0x00, RSPI_SPCKD); + rspi_write8(rspi, 0x00, RSPI_SSLND); + rspi_write8(rspi, 0x00, RSPI_SPND); + + /* Data Length Setting */ + if (access_size == 8) + rspi->spcmd |= SPCMD_SPB_8BIT; + else if (access_size == 16) + rspi->spcmd |= SPCMD_SPB_16BIT; + else + rspi->spcmd |= SPCMD_SPB_32BIT; + + rspi->spcmd |= SPCMD_SCKDEN | SPCMD_SLNDEN | SPCMD_SPNDEN; + + /* Resets transfer data length */ + rspi_write32(rspi, 0, QSPI_SPBMUL0); + + /* Resets transmit and receive buffer */ + rspi_write8(rspi, SPBFCR_TXRST | SPBFCR_RXRST, QSPI_SPBFCR); + /* Sets buffer to allow normal operation */ + rspi_write8(rspi, 0x00, QSPI_SPBFCR); + + /* Resets sequencer */ + rspi_write8(rspi, 0, RSPI_SPSCR); + rspi_write16(rspi, rspi->spcmd, RSPI_SPCMD0); + + /* Sets RSPI mode */ + rspi_write8(rspi, SPCR_MSTR, RSPI_SPCR); + + return 0; +} + +static void qspi_update(const struct rspi_data *rspi, u8 mask, u8 val, u8 reg) +{ + u8 data; + + data = rspi_read8(rspi, reg); + data &= ~mask; + data |= (val & mask); + rspi_write8(rspi, data, reg); +} + +static unsigned int qspi_set_send_trigger(struct rspi_data *rspi, + unsigned int len) +{ + unsigned int n; + + n = min(len, QSPI_BUFFER_SIZE); + + if (len >= QSPI_BUFFER_SIZE) { + /* sets triggering number to 32 bytes */ + qspi_update(rspi, SPBFCR_TXTRG_MASK, + SPBFCR_TXTRG_32B, QSPI_SPBFCR); + } else { + /* sets triggering number to 1 byte */ + qspi_update(rspi, SPBFCR_TXTRG_MASK, + SPBFCR_TXTRG_1B, QSPI_SPBFCR); + } + + return n; +} + +static int qspi_set_receive_trigger(struct rspi_data *rspi, unsigned int len) +{ + unsigned int n; + + n = min(len, QSPI_BUFFER_SIZE); + + if (len >= QSPI_BUFFER_SIZE) { + /* sets triggering number to 32 bytes */ + qspi_update(rspi, SPBFCR_RXTRG_MASK, + SPBFCR_RXTRG_32B, QSPI_SPBFCR); + } else { + /* sets triggering number to 1 byte */ + qspi_update(rspi, SPBFCR_RXTRG_MASK, + SPBFCR_RXTRG_1B, QSPI_SPBFCR); + } + return n; +} + +static void rspi_enable_irq(const struct rspi_data *rspi, u8 enable) +{ + rspi_write8(rspi, rspi_read8(rspi, RSPI_SPCR) | enable, RSPI_SPCR); +} + +static void rspi_disable_irq(const struct rspi_data *rspi, u8 disable) +{ + rspi_write8(rspi, rspi_read8(rspi, RSPI_SPCR) & ~disable, RSPI_SPCR); +} + +static int rspi_wait_for_interrupt(struct rspi_data *rspi, u8 wait_mask, + u8 enable_bit) +{ + int ret; + + rspi->spsr = rspi_read8(rspi, RSPI_SPSR); + if (rspi->spsr & wait_mask) + return 0; + + rspi_enable_irq(rspi, enable_bit); + ret = wait_event_timeout(rspi->wait, rspi->spsr & wait_mask, HZ); + if (ret == 0 && !(rspi->spsr & wait_mask)) + return -ETIMEDOUT; + + return 0; +} + +static inline int rspi_wait_for_tx_empty(struct rspi_data *rspi) +{ + return rspi_wait_for_interrupt(rspi, SPSR_SPTEF, SPCR_SPTIE); +} + +static inline int rspi_wait_for_rx_full(struct rspi_data *rspi) +{ + return rspi_wait_for_interrupt(rspi, SPSR_SPRF, SPCR_SPRIE); +} + +static int rspi_data_out(struct rspi_data *rspi, u8 data) +{ + int error = rspi_wait_for_tx_empty(rspi); + if (error < 0) { + dev_err(&rspi->ctlr->dev, "transmit timeout\n"); + return error; + } + rspi_write_data(rspi, data); + return 0; +} + +static int rspi_data_in(struct rspi_data *rspi) +{ + int error; + u8 data; + + error = rspi_wait_for_rx_full(rspi); + if (error < 0) { + dev_err(&rspi->ctlr->dev, "receive timeout\n"); + return error; + } + data = rspi_read_data(rspi); + return data; +} + +static int rspi_pio_transfer(struct rspi_data *rspi, const u8 *tx, u8 *rx, + unsigned int n) +{ + while (n-- > 0) { + if (tx) { + int ret = rspi_data_out(rspi, *tx++); + if (ret < 0) + return ret; + } + if (rx) { + int ret = rspi_data_in(rspi); + if (ret < 0) + return ret; + *rx++ = ret; + } + } + + return 0; +} + +static void rspi_dma_complete(void *arg) +{ + struct rspi_data *rspi = arg; + + rspi->dma_callbacked = 1; + wake_up_interruptible(&rspi->wait); +} + +static int rspi_dma_transfer(struct rspi_data *rspi, struct sg_table *tx, + struct sg_table *rx) +{ + struct dma_async_tx_descriptor *desc_tx = NULL, *desc_rx = NULL; + u8 irq_mask = 0; + unsigned int other_irq = 0; + dma_cookie_t cookie; + int ret; + + /* First prepare and submit the DMA request(s), as this may fail */ + if (rx) { + desc_rx = dmaengine_prep_slave_sg(rspi->ctlr->dma_rx, rx->sgl, + rx->nents, DMA_DEV_TO_MEM, + DMA_PREP_INTERRUPT | DMA_CTRL_ACK); + if (!desc_rx) { + ret = -EAGAIN; + goto no_dma_rx; + } + + desc_rx->callback = rspi_dma_complete; + desc_rx->callback_param = rspi; + cookie = dmaengine_submit(desc_rx); + if (dma_submit_error(cookie)) { + ret = cookie; + goto no_dma_rx; + } + + irq_mask |= SPCR_SPRIE; + } + + if (tx) { + desc_tx = dmaengine_prep_slave_sg(rspi->ctlr->dma_tx, tx->sgl, + tx->nents, DMA_MEM_TO_DEV, + DMA_PREP_INTERRUPT | DMA_CTRL_ACK); + if (!desc_tx) { + ret = -EAGAIN; + goto no_dma_tx; + } + + if (rx) { + /* No callback */ + desc_tx->callback = NULL; + } else { + desc_tx->callback = rspi_dma_complete; + desc_tx->callback_param = rspi; + } + cookie = dmaengine_submit(desc_tx); + if (dma_submit_error(cookie)) { + ret = cookie; + goto no_dma_tx; + } + + irq_mask |= SPCR_SPTIE; + } + + /* + * DMAC needs SPxIE, but if SPxIE is set, the IRQ routine will be + * called. So, this driver disables the IRQ while DMA transfer. + */ + if (tx) + disable_irq(other_irq = rspi->tx_irq); + if (rx && rspi->rx_irq != other_irq) + disable_irq(rspi->rx_irq); + + rspi_enable_irq(rspi, irq_mask); + rspi->dma_callbacked = 0; + + /* Now start DMA */ + if (rx) + dma_async_issue_pending(rspi->ctlr->dma_rx); + if (tx) + dma_async_issue_pending(rspi->ctlr->dma_tx); + + ret = wait_event_interruptible_timeout(rspi->wait, + rspi->dma_callbacked, HZ); + if (ret > 0 && rspi->dma_callbacked) { + ret = 0; + if (tx) + dmaengine_synchronize(rspi->ctlr->dma_tx); + if (rx) + dmaengine_synchronize(rspi->ctlr->dma_rx); + } else { + if (!ret) { + dev_err(&rspi->ctlr->dev, "DMA timeout\n"); + ret = -ETIMEDOUT; + } + if (tx) + dmaengine_terminate_all(rspi->ctlr->dma_tx); + if (rx) + dmaengine_terminate_all(rspi->ctlr->dma_rx); + } + + rspi_disable_irq(rspi, irq_mask); + + if (tx) + enable_irq(rspi->tx_irq); + if (rx && rspi->rx_irq != other_irq) + enable_irq(rspi->rx_irq); + + return ret; + +no_dma_tx: + if (rx) + dmaengine_terminate_all(rspi->ctlr->dma_rx); +no_dma_rx: + if (ret == -EAGAIN) { + dev_warn_once(&rspi->ctlr->dev, + "DMA not available, falling back to PIO\n"); + } + return ret; +} + +static void rspi_receive_init(const struct rspi_data *rspi) +{ + u8 spsr; + + spsr = rspi_read8(rspi, RSPI_SPSR); + if (spsr & SPSR_SPRF) + rspi_read_data(rspi); /* dummy read */ + if (spsr & SPSR_OVRF) + rspi_write8(rspi, rspi_read8(rspi, RSPI_SPSR) & ~SPSR_OVRF, + RSPI_SPSR); +} + +static void rspi_rz_receive_init(const struct rspi_data *rspi) +{ + rspi_receive_init(rspi); + rspi_write8(rspi, SPBFCR_TXRST | SPBFCR_RXRST, RSPI_SPBFCR); + rspi_write8(rspi, 0, RSPI_SPBFCR); +} + +static void qspi_receive_init(const struct rspi_data *rspi) +{ + u8 spsr; + + spsr = rspi_read8(rspi, RSPI_SPSR); + if (spsr & SPSR_SPRF) + rspi_read_data(rspi); /* dummy read */ + rspi_write8(rspi, SPBFCR_TXRST | SPBFCR_RXRST, QSPI_SPBFCR); + rspi_write8(rspi, 0, QSPI_SPBFCR); +} + +static bool __rspi_can_dma(const struct rspi_data *rspi, + const struct spi_transfer *xfer) +{ + return xfer->len > rspi->ops->fifo_size; +} + +static bool rspi_can_dma(struct spi_controller *ctlr, struct spi_device *spi, + struct spi_transfer *xfer) +{ + struct rspi_data *rspi = spi_controller_get_devdata(ctlr); + + return __rspi_can_dma(rspi, xfer); +} + +static int rspi_dma_check_then_transfer(struct rspi_data *rspi, + struct spi_transfer *xfer) +{ + if (!rspi->ctlr->can_dma || !__rspi_can_dma(rspi, xfer)) + return -EAGAIN; + + /* rx_buf can be NULL on RSPI on SH in TX-only Mode */ + return rspi_dma_transfer(rspi, &xfer->tx_sg, + xfer->rx_buf ? &xfer->rx_sg : NULL); +} + +static int rspi_common_transfer(struct rspi_data *rspi, + struct spi_transfer *xfer) +{ + int ret; + + xfer->effective_speed_hz = rspi->speed_hz; + + ret = rspi_dma_check_then_transfer(rspi, xfer); + if (ret != -EAGAIN) + return ret; + + ret = rspi_pio_transfer(rspi, xfer->tx_buf, xfer->rx_buf, xfer->len); + if (ret < 0) + return ret; + + /* Wait for the last transmission */ + rspi_wait_for_tx_empty(rspi); + + return 0; +} + +static int rspi_transfer_one(struct spi_controller *ctlr, + struct spi_device *spi, struct spi_transfer *xfer) +{ + struct rspi_data *rspi = spi_controller_get_devdata(ctlr); + u8 spcr; + + spcr = rspi_read8(rspi, RSPI_SPCR); + if (xfer->rx_buf) { + rspi_receive_init(rspi); + spcr &= ~SPCR_TXMD; + } else { + spcr |= SPCR_TXMD; + } + rspi_write8(rspi, spcr, RSPI_SPCR); + + return rspi_common_transfer(rspi, xfer); +} + +static int rspi_rz_transfer_one(struct spi_controller *ctlr, + struct spi_device *spi, + struct spi_transfer *xfer) +{ + struct rspi_data *rspi = spi_controller_get_devdata(ctlr); + + rspi_rz_receive_init(rspi); + + return rspi_common_transfer(rspi, xfer); +} + +static int qspi_trigger_transfer_out_in(struct rspi_data *rspi, const u8 *tx, + u8 *rx, unsigned int len) +{ + unsigned int i, n; + int ret; + + while (len > 0) { + n = qspi_set_send_trigger(rspi, len); + qspi_set_receive_trigger(rspi, len); + ret = rspi_wait_for_tx_empty(rspi); + if (ret < 0) { + dev_err(&rspi->ctlr->dev, "transmit timeout\n"); + return ret; + } + for (i = 0; i < n; i++) + rspi_write_data(rspi, *tx++); + + ret = rspi_wait_for_rx_full(rspi); + if (ret < 0) { + dev_err(&rspi->ctlr->dev, "receive timeout\n"); + return ret; + } + for (i = 0; i < n; i++) + *rx++ = rspi_read_data(rspi); + + len -= n; + } + + return 0; +} + +static int qspi_transfer_out_in(struct rspi_data *rspi, + struct spi_transfer *xfer) +{ + int ret; + + qspi_receive_init(rspi); + + ret = rspi_dma_check_then_transfer(rspi, xfer); + if (ret != -EAGAIN) + return ret; + + return qspi_trigger_transfer_out_in(rspi, xfer->tx_buf, + xfer->rx_buf, xfer->len); +} + +static int qspi_transfer_out(struct rspi_data *rspi, struct spi_transfer *xfer) +{ + const u8 *tx = xfer->tx_buf; + unsigned int n = xfer->len; + unsigned int i, len; + int ret; + + if (rspi->ctlr->can_dma && __rspi_can_dma(rspi, xfer)) { + ret = rspi_dma_transfer(rspi, &xfer->tx_sg, NULL); + if (ret != -EAGAIN) + return ret; + } + + while (n > 0) { + len = qspi_set_send_trigger(rspi, n); + ret = rspi_wait_for_tx_empty(rspi); + if (ret < 0) { + dev_err(&rspi->ctlr->dev, "transmit timeout\n"); + return ret; + } + for (i = 0; i < len; i++) + rspi_write_data(rspi, *tx++); + + n -= len; + } + + /* Wait for the last transmission */ + rspi_wait_for_tx_empty(rspi); + + return 0; +} + +static int qspi_transfer_in(struct rspi_data *rspi, struct spi_transfer *xfer) +{ + u8 *rx = xfer->rx_buf; + unsigned int n = xfer->len; + unsigned int i, len; + int ret; + + if (rspi->ctlr->can_dma && __rspi_can_dma(rspi, xfer)) { + int ret = rspi_dma_transfer(rspi, NULL, &xfer->rx_sg); + if (ret != -EAGAIN) + return ret; + } + + while (n > 0) { + len = qspi_set_receive_trigger(rspi, n); + ret = rspi_wait_for_rx_full(rspi); + if (ret < 0) { + dev_err(&rspi->ctlr->dev, "receive timeout\n"); + return ret; + } + for (i = 0; i < len; i++) + *rx++ = rspi_read_data(rspi); + + n -= len; + } + + return 0; +} + +static int qspi_transfer_one(struct spi_controller *ctlr, + struct spi_device *spi, struct spi_transfer *xfer) +{ + struct rspi_data *rspi = spi_controller_get_devdata(ctlr); + + xfer->effective_speed_hz = rspi->speed_hz; + if (spi->mode & SPI_LOOP) { + return qspi_transfer_out_in(rspi, xfer); + } else if (xfer->tx_nbits > SPI_NBITS_SINGLE) { + /* Quad or Dual SPI Write */ + return qspi_transfer_out(rspi, xfer); + } else if (xfer->rx_nbits > SPI_NBITS_SINGLE) { + /* Quad or Dual SPI Read */ + return qspi_transfer_in(rspi, xfer); + } else { + /* Single SPI Transfer */ + return qspi_transfer_out_in(rspi, xfer); + } +} + +static u16 qspi_transfer_mode(const struct spi_transfer *xfer) +{ + if (xfer->tx_buf) + switch (xfer->tx_nbits) { + case SPI_NBITS_QUAD: + return SPCMD_SPIMOD_QUAD; + case SPI_NBITS_DUAL: + return SPCMD_SPIMOD_DUAL; + default: + return 0; + } + if (xfer->rx_buf) + switch (xfer->rx_nbits) { + case SPI_NBITS_QUAD: + return SPCMD_SPIMOD_QUAD | SPCMD_SPRW; + case SPI_NBITS_DUAL: + return SPCMD_SPIMOD_DUAL | SPCMD_SPRW; + default: + return 0; + } + + return 0; +} + +static int qspi_setup_sequencer(struct rspi_data *rspi, + const struct spi_message *msg) +{ + const struct spi_transfer *xfer; + unsigned int i = 0, len = 0; + u16 current_mode = 0xffff, mode; + + list_for_each_entry(xfer, &msg->transfers, transfer_list) { + mode = qspi_transfer_mode(xfer); + if (mode == current_mode) { + len += xfer->len; + continue; + } + + /* Transfer mode change */ + if (i) { + /* Set transfer data length of previous transfer */ + rspi_write32(rspi, len, QSPI_SPBMUL(i - 1)); + } + + if (i >= QSPI_NUM_SPCMD) { + dev_err(&msg->spi->dev, + "Too many different transfer modes"); + return -EINVAL; + } + + /* Program transfer mode for this transfer */ + rspi_write16(rspi, rspi->spcmd | mode, RSPI_SPCMD(i)); + current_mode = mode; + len = xfer->len; + i++; + } + if (i) { + /* Set final transfer data length and sequence length */ + rspi_write32(rspi, len, QSPI_SPBMUL(i - 1)); + rspi_write8(rspi, i - 1, RSPI_SPSCR); + } + + return 0; +} + +static int rspi_setup(struct spi_device *spi) +{ + struct rspi_data *rspi = spi_controller_get_devdata(spi->controller); + u8 sslp; + + if (spi->cs_gpiod) + return 0; + + pm_runtime_get_sync(&rspi->pdev->dev); + spin_lock_irq(&rspi->lock); + + sslp = rspi_read8(rspi, RSPI_SSLP); + if (spi->mode & SPI_CS_HIGH) + sslp |= SSLP_SSLP(spi->chip_select); + else + sslp &= ~SSLP_SSLP(spi->chip_select); + rspi_write8(rspi, sslp, RSPI_SSLP); + + spin_unlock_irq(&rspi->lock); + pm_runtime_put(&rspi->pdev->dev); + return 0; +} + +static int rspi_prepare_message(struct spi_controller *ctlr, + struct spi_message *msg) +{ + struct rspi_data *rspi = spi_controller_get_devdata(ctlr); + struct spi_device *spi = msg->spi; + const struct spi_transfer *xfer; + int ret; + + /* + * As the Bit Rate Register must not be changed while the device is + * active, all transfers in a message must use the same bit rate. + * In theory, the sequencer could be enabled, and each Command Register + * could divide the base bit rate by a different value. + * However, most RSPI variants do not have Transfer Data Length + * Multiplier Setting Registers, so each sequence step would be limited + * to a single word, making this feature unsuitable for large + * transfers, which would gain most from it. + */ + rspi->speed_hz = spi->max_speed_hz; + list_for_each_entry(xfer, &msg->transfers, transfer_list) { + if (xfer->speed_hz < rspi->speed_hz) + rspi->speed_hz = xfer->speed_hz; + } + + rspi->spcmd = SPCMD_SSLKP; + if (spi->mode & SPI_CPOL) + rspi->spcmd |= SPCMD_CPOL; + if (spi->mode & SPI_CPHA) + rspi->spcmd |= SPCMD_CPHA; + if (spi->mode & SPI_LSB_FIRST) + rspi->spcmd |= SPCMD_LSBF; + + /* Configure slave signal to assert */ + rspi->spcmd |= SPCMD_SSLA(spi->cs_gpiod ? rspi->ctlr->unused_native_cs + : spi->chip_select); + + /* CMOS output mode and MOSI signal from previous transfer */ + rspi->sppcr = 0; + if (spi->mode & SPI_LOOP) + rspi->sppcr |= SPPCR_SPLP; + + rspi->ops->set_config_register(rspi, 8); + + if (msg->spi->mode & + (SPI_TX_DUAL | SPI_TX_QUAD | SPI_RX_DUAL | SPI_RX_QUAD)) { + /* Setup sequencer for messages with multiple transfer modes */ + ret = qspi_setup_sequencer(rspi, msg); + if (ret < 0) + return ret; + } + + /* Enable SPI function in master mode */ + rspi_write8(rspi, rspi_read8(rspi, RSPI_SPCR) | SPCR_SPE, RSPI_SPCR); + return 0; +} + +static int rspi_unprepare_message(struct spi_controller *ctlr, + struct spi_message *msg) +{ + struct rspi_data *rspi = spi_controller_get_devdata(ctlr); + + /* Disable SPI function */ + rspi_write8(rspi, rspi_read8(rspi, RSPI_SPCR) & ~SPCR_SPE, RSPI_SPCR); + + /* Reset sequencer for Single SPI Transfers */ + rspi_write16(rspi, rspi->spcmd, RSPI_SPCMD0); + rspi_write8(rspi, 0, RSPI_SPSCR); + return 0; +} + +static irqreturn_t rspi_irq_mux(int irq, void *_sr) +{ + struct rspi_data *rspi = _sr; + u8 spsr; + irqreturn_t ret = IRQ_NONE; + u8 disable_irq = 0; + + rspi->spsr = spsr = rspi_read8(rspi, RSPI_SPSR); + if (spsr & SPSR_SPRF) + disable_irq |= SPCR_SPRIE; + if (spsr & SPSR_SPTEF) + disable_irq |= SPCR_SPTIE; + + if (disable_irq) { + ret = IRQ_HANDLED; + rspi_disable_irq(rspi, disable_irq); + wake_up(&rspi->wait); + } + + return ret; +} + +static irqreturn_t rspi_irq_rx(int irq, void *_sr) +{ + struct rspi_data *rspi = _sr; + u8 spsr; + + rspi->spsr = spsr = rspi_read8(rspi, RSPI_SPSR); + if (spsr & SPSR_SPRF) { + rspi_disable_irq(rspi, SPCR_SPRIE); + wake_up(&rspi->wait); + return IRQ_HANDLED; + } + + return 0; +} + +static irqreturn_t rspi_irq_tx(int irq, void *_sr) +{ + struct rspi_data *rspi = _sr; + u8 spsr; + + rspi->spsr = spsr = rspi_read8(rspi, RSPI_SPSR); + if (spsr & SPSR_SPTEF) { + rspi_disable_irq(rspi, SPCR_SPTIE); + wake_up(&rspi->wait); + return IRQ_HANDLED; + } + + return 0; +} + +static struct dma_chan *rspi_request_dma_chan(struct device *dev, + enum dma_transfer_direction dir, + unsigned int id, + dma_addr_t port_addr) +{ + dma_cap_mask_t mask; + struct dma_chan *chan; + struct dma_slave_config cfg; + int ret; + + dma_cap_zero(mask); + dma_cap_set(DMA_SLAVE, mask); + + chan = dma_request_slave_channel_compat(mask, shdma_chan_filter, + (void *)(unsigned long)id, dev, + dir == DMA_MEM_TO_DEV ? "tx" : "rx"); + if (!chan) { + dev_warn(dev, "dma_request_slave_channel_compat failed\n"); + return NULL; + } + + memset(&cfg, 0, sizeof(cfg)); + cfg.dst_addr = port_addr + RSPI_SPDR; + cfg.src_addr = port_addr + RSPI_SPDR; + cfg.dst_addr_width = DMA_SLAVE_BUSWIDTH_1_BYTE; + cfg.src_addr_width = DMA_SLAVE_BUSWIDTH_1_BYTE; + cfg.direction = dir; + + ret = dmaengine_slave_config(chan, &cfg); + if (ret) { + dev_warn(dev, "dmaengine_slave_config failed %d\n", ret); + dma_release_channel(chan); + return NULL; + } + + return chan; +} + +static int rspi_request_dma(struct device *dev, struct spi_controller *ctlr, + const struct resource *res) +{ + const struct rspi_plat_data *rspi_pd = dev_get_platdata(dev); + unsigned int dma_tx_id, dma_rx_id; + + if (dev->of_node) { + /* In the OF case we will get the slave IDs from the DT */ + dma_tx_id = 0; + dma_rx_id = 0; + } else if (rspi_pd && rspi_pd->dma_tx_id && rspi_pd->dma_rx_id) { + dma_tx_id = rspi_pd->dma_tx_id; + dma_rx_id = rspi_pd->dma_rx_id; + } else { + /* The driver assumes no error. */ + return 0; + } + + ctlr->dma_tx = rspi_request_dma_chan(dev, DMA_MEM_TO_DEV, dma_tx_id, + res->start); + if (!ctlr->dma_tx) + return -ENODEV; + + ctlr->dma_rx = rspi_request_dma_chan(dev, DMA_DEV_TO_MEM, dma_rx_id, + res->start); + if (!ctlr->dma_rx) { + dma_release_channel(ctlr->dma_tx); + ctlr->dma_tx = NULL; + return -ENODEV; + } + + ctlr->can_dma = rspi_can_dma; + dev_info(dev, "DMA available"); + return 0; +} + +static void rspi_release_dma(struct spi_controller *ctlr) +{ + if (ctlr->dma_tx) + dma_release_channel(ctlr->dma_tx); + if (ctlr->dma_rx) + dma_release_channel(ctlr->dma_rx); +} + +static int rspi_remove(struct platform_device *pdev) +{ + struct rspi_data *rspi = platform_get_drvdata(pdev); + + rspi_release_dma(rspi->ctlr); + pm_runtime_disable(&pdev->dev); + + return 0; +} + +static const struct spi_ops rspi_ops = { + .set_config_register = rspi_set_config_register, + .transfer_one = rspi_transfer_one, + .min_div = 2, + .max_div = 4096, + .flags = SPI_CONTROLLER_MUST_TX, + .fifo_size = 8, + .num_hw_ss = 2, +}; + +static const struct spi_ops rspi_rz_ops = { + .set_config_register = rspi_rz_set_config_register, + .transfer_one = rspi_rz_transfer_one, + .min_div = 2, + .max_div = 4096, + .flags = SPI_CONTROLLER_MUST_RX | SPI_CONTROLLER_MUST_TX, + .fifo_size = 8, /* 8 for TX, 32 for RX */ + .num_hw_ss = 1, +}; + +static const struct spi_ops qspi_ops = { + .set_config_register = qspi_set_config_register, + .transfer_one = qspi_transfer_one, + .extra_mode_bits = SPI_TX_DUAL | SPI_TX_QUAD | + SPI_RX_DUAL | SPI_RX_QUAD, + .min_div = 1, + .max_div = 4080, + .flags = SPI_CONTROLLER_MUST_RX | SPI_CONTROLLER_MUST_TX, + .fifo_size = 32, + .num_hw_ss = 1, +}; + +#ifdef CONFIG_OF +static const struct of_device_id rspi_of_match[] = { + /* RSPI on legacy SH */ + { .compatible = "renesas,rspi", .data = &rspi_ops }, + /* RSPI on RZ/A1H */ + { .compatible = "renesas,rspi-rz", .data = &rspi_rz_ops }, + /* QSPI on R-Car Gen2 */ + { .compatible = "renesas,qspi", .data = &qspi_ops }, + { /* sentinel */ } +}; + +MODULE_DEVICE_TABLE(of, rspi_of_match); + +static int rspi_parse_dt(struct device *dev, struct spi_controller *ctlr) +{ + u32 num_cs; + int error; + + /* Parse DT properties */ + error = of_property_read_u32(dev->of_node, "num-cs", &num_cs); + if (error) { + dev_err(dev, "of_property_read_u32 num-cs failed %d\n", error); + return error; + } + + ctlr->num_chipselect = num_cs; + return 0; +} +#else +#define rspi_of_match NULL +static inline int rspi_parse_dt(struct device *dev, struct spi_controller *ctlr) +{ + return -EINVAL; +} +#endif /* CONFIG_OF */ + +static int rspi_request_irq(struct device *dev, unsigned int irq, + irq_handler_t handler, const char *suffix, + void *dev_id) +{ + const char *name = devm_kasprintf(dev, GFP_KERNEL, "%s:%s", + dev_name(dev), suffix); + if (!name) + return -ENOMEM; + + return devm_request_irq(dev, irq, handler, 0, name, dev_id); +} + +static int rspi_probe(struct platform_device *pdev) +{ + struct resource *res; + struct spi_controller *ctlr; + struct rspi_data *rspi; + int ret; + const struct rspi_plat_data *rspi_pd; + const struct spi_ops *ops; + unsigned long clksrc; + + ctlr = spi_alloc_master(&pdev->dev, sizeof(struct rspi_data)); + if (ctlr == NULL) + return -ENOMEM; + + ops = of_device_get_match_data(&pdev->dev); + if (ops) { + ret = rspi_parse_dt(&pdev->dev, ctlr); + if (ret) + goto error1; + } else { + ops = (struct spi_ops *)pdev->id_entry->driver_data; + rspi_pd = dev_get_platdata(&pdev->dev); + if (rspi_pd && rspi_pd->num_chipselect) + ctlr->num_chipselect = rspi_pd->num_chipselect; + else + ctlr->num_chipselect = 2; /* default */ + } + + rspi = spi_controller_get_devdata(ctlr); + platform_set_drvdata(pdev, rspi); + rspi->ops = ops; + rspi->ctlr = ctlr; + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + rspi->addr = devm_ioremap_resource(&pdev->dev, res); + if (IS_ERR(rspi->addr)) { + ret = PTR_ERR(rspi->addr); + goto error1; + } + + rspi->clk = devm_clk_get(&pdev->dev, NULL); + if (IS_ERR(rspi->clk)) { + dev_err(&pdev->dev, "cannot get clock\n"); + ret = PTR_ERR(rspi->clk); + goto error1; + } + + rspi->pdev = pdev; + pm_runtime_enable(&pdev->dev); + + init_waitqueue_head(&rspi->wait); + spin_lock_init(&rspi->lock); + + ctlr->bus_num = pdev->id; + ctlr->setup = rspi_setup; + ctlr->auto_runtime_pm = true; + ctlr->transfer_one = ops->transfer_one; + ctlr->prepare_message = rspi_prepare_message; + ctlr->unprepare_message = rspi_unprepare_message; + ctlr->mode_bits = SPI_CPHA | SPI_CPOL | SPI_CS_HIGH | SPI_LSB_FIRST | + SPI_LOOP | ops->extra_mode_bits; + clksrc = clk_get_rate(rspi->clk); + ctlr->min_speed_hz = DIV_ROUND_UP(clksrc, ops->max_div); + ctlr->max_speed_hz = DIV_ROUND_UP(clksrc, ops->min_div); + ctlr->flags = ops->flags; + ctlr->dev.of_node = pdev->dev.of_node; + ctlr->use_gpio_descriptors = true; + ctlr->max_native_cs = rspi->ops->num_hw_ss; + + ret = platform_get_irq_byname_optional(pdev, "rx"); + if (ret < 0) { + ret = platform_get_irq_byname_optional(pdev, "mux"); + if (ret < 0) + ret = platform_get_irq(pdev, 0); + if (ret >= 0) + rspi->rx_irq = rspi->tx_irq = ret; + } else { + rspi->rx_irq = ret; + ret = platform_get_irq_byname(pdev, "tx"); + if (ret >= 0) + rspi->tx_irq = ret; + } + + if (rspi->rx_irq == rspi->tx_irq) { + /* Single multiplexed interrupt */ + ret = rspi_request_irq(&pdev->dev, rspi->rx_irq, rspi_irq_mux, + "mux", rspi); + } else { + /* Multi-interrupt mode, only SPRI and SPTI are used */ + ret = rspi_request_irq(&pdev->dev, rspi->rx_irq, rspi_irq_rx, + "rx", rspi); + if (!ret) + ret = rspi_request_irq(&pdev->dev, rspi->tx_irq, + rspi_irq_tx, "tx", rspi); + } + if (ret < 0) { + dev_err(&pdev->dev, "request_irq error\n"); + goto error2; + } + + ret = rspi_request_dma(&pdev->dev, ctlr, res); + if (ret < 0) + dev_warn(&pdev->dev, "DMA not available, using PIO\n"); + + ret = devm_spi_register_controller(&pdev->dev, ctlr); + if (ret < 0) { + dev_err(&pdev->dev, "devm_spi_register_controller error.\n"); + goto error3; + } + + dev_info(&pdev->dev, "probed\n"); + + return 0; + +error3: + rspi_release_dma(ctlr); +error2: + pm_runtime_disable(&pdev->dev); +error1: + spi_controller_put(ctlr); + + return ret; +} + +static const struct platform_device_id spi_driver_ids[] = { + { "rspi", (kernel_ulong_t)&rspi_ops }, + {}, +}; + +MODULE_DEVICE_TABLE(platform, spi_driver_ids); + +#ifdef CONFIG_PM_SLEEP +static int rspi_suspend(struct device *dev) +{ + struct rspi_data *rspi = dev_get_drvdata(dev); + + return spi_controller_suspend(rspi->ctlr); +} + +static int rspi_resume(struct device *dev) +{ + struct rspi_data *rspi = dev_get_drvdata(dev); + + return spi_controller_resume(rspi->ctlr); +} + +static SIMPLE_DEV_PM_OPS(rspi_pm_ops, rspi_suspend, rspi_resume); +#define DEV_PM_OPS &rspi_pm_ops +#else +#define DEV_PM_OPS NULL +#endif /* CONFIG_PM_SLEEP */ + +static struct platform_driver rspi_driver = { + .probe = rspi_probe, + .remove = rspi_remove, + .id_table = spi_driver_ids, + .driver = { + .name = "renesas_spi", + .pm = DEV_PM_OPS, + .of_match_table = of_match_ptr(rspi_of_match), + }, +}; +module_platform_driver(rspi_driver); + +MODULE_DESCRIPTION("Renesas RSPI bus driver"); +MODULE_LICENSE("GPL v2"); +MODULE_AUTHOR("Yoshihiro Shimoda"); +MODULE_ALIAS("platform:rspi"); diff --git a/drivers/spi/spi-s3c24xx-regs.h b/drivers/spi/spi-s3c24xx-regs.h new file mode 100644 index 000000000..f51464ab5 --- /dev/null +++ b/drivers/spi/spi-s3c24xx-regs.h @@ -0,0 +1,41 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Copyright (c) 2004 Fetron GmbH + * + * S3C2410 SPI register definition + */ + +#ifndef __SPI_S3C2410_H +#define __SPI_S3C2410_H + +#define S3C2410_SPCON (0x00) + +#define S3C2410_SPCON_SMOD_DMA (2 << 5) /* DMA mode */ +#define S3C2410_SPCON_SMOD_INT (1 << 5) /* interrupt mode */ +#define S3C2410_SPCON_SMOD_POLL (0 << 5) /* polling mode */ +#define S3C2410_SPCON_ENSCK (1 << 4) /* Enable SCK */ +#define S3C2410_SPCON_MSTR (1 << 3) /* Master:1, Slave:0 select */ +#define S3C2410_SPCON_CPOL_HIGH (1 << 2) /* Clock polarity select */ +#define S3C2410_SPCON_CPOL_LOW (0 << 2) /* Clock polarity select */ + +#define S3C2410_SPCON_CPHA_FMTB (1 << 1) /* Clock Phase Select */ +#define S3C2410_SPCON_CPHA_FMTA (0 << 1) /* Clock Phase Select */ + +#define S3C2410_SPSTA (0x04) + +#define S3C2410_SPSTA_DCOL (1 << 2) /* Data Collision Error */ +#define S3C2410_SPSTA_MULD (1 << 1) /* Multi Master Error */ +#define S3C2410_SPSTA_READY (1 << 0) /* Data Tx/Rx ready */ +#define S3C2412_SPSTA_READY_ORG (1 << 3) + +#define S3C2410_SPPIN (0x08) + +#define S3C2410_SPPIN_ENMUL (1 << 2) /* Multi Master Error detect */ +#define S3C2410_SPPIN_RESERVED (1 << 1) +#define S3C2410_SPPIN_KEEP (1 << 0) /* Master Out keep */ + +#define S3C2410_SPPRE (0x0C) +#define S3C2410_SPTDAT (0x10) +#define S3C2410_SPRDAT (0x14) + +#endif /* __SPI_S3C2410_H */ diff --git a/drivers/spi/spi-s3c24xx.c b/drivers/spi/spi-s3c24xx.c new file mode 100644 index 000000000..d6f51695c --- /dev/null +++ b/drivers/spi/spi-s3c24xx.c @@ -0,0 +1,645 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright (c) 2006 Ben Dooks + * Copyright 2006-2009 Simtec Electronics + * Ben Dooks <ben@simtec.co.uk> +*/ + +#include <linux/spinlock.h> +#include <linux/interrupt.h> +#include <linux/delay.h> +#include <linux/errno.h> +#include <linux/err.h> +#include <linux/clk.h> +#include <linux/platform_device.h> +#include <linux/gpio.h> +#include <linux/io.h> +#include <linux/slab.h> + +#include <linux/spi/spi.h> +#include <linux/spi/spi_bitbang.h> +#include <linux/spi/s3c24xx.h> +#include <linux/spi/s3c24xx-fiq.h> +#include <linux/module.h> + +#include <asm/fiq.h> + +#include "spi-s3c24xx-regs.h" + +/** + * struct s3c24xx_spi_devstate - per device data + * @hz: Last frequency calculated for @sppre field. + * @mode: Last mode setting for the @spcon field. + * @spcon: Value to write to the SPCON register. + * @sppre: Value to write to the SPPRE register. + */ +struct s3c24xx_spi_devstate { + unsigned int hz; + unsigned int mode; + u8 spcon; + u8 sppre; +}; + +enum spi_fiq_mode { + FIQ_MODE_NONE = 0, + FIQ_MODE_TX = 1, + FIQ_MODE_RX = 2, + FIQ_MODE_TXRX = 3, +}; + +struct s3c24xx_spi { + /* bitbang has to be first */ + struct spi_bitbang bitbang; + struct completion done; + + void __iomem *regs; + int irq; + int len; + int count; + + struct fiq_handler fiq_handler; + enum spi_fiq_mode fiq_mode; + unsigned char fiq_inuse; + unsigned char fiq_claimed; + + void (*set_cs)(struct s3c2410_spi_info *spi, + int cs, int pol); + + /* data buffers */ + const unsigned char *tx; + unsigned char *rx; + + struct clk *clk; + struct spi_master *master; + struct spi_device *curdev; + struct device *dev; + struct s3c2410_spi_info *pdata; +}; + +#define SPCON_DEFAULT (S3C2410_SPCON_MSTR | S3C2410_SPCON_SMOD_INT) +#define SPPIN_DEFAULT (S3C2410_SPPIN_KEEP) + +static inline struct s3c24xx_spi *to_hw(struct spi_device *sdev) +{ + return spi_master_get_devdata(sdev->master); +} + +static void s3c24xx_spi_gpiocs(struct s3c2410_spi_info *spi, int cs, int pol) +{ + gpio_set_value(spi->pin_cs, pol); +} + +static void s3c24xx_spi_chipsel(struct spi_device *spi, int value) +{ + struct s3c24xx_spi_devstate *cs = spi->controller_state; + struct s3c24xx_spi *hw = to_hw(spi); + unsigned int cspol = spi->mode & SPI_CS_HIGH ? 1 : 0; + + /* change the chipselect state and the state of the spi engine clock */ + + switch (value) { + case BITBANG_CS_INACTIVE: + hw->set_cs(hw->pdata, spi->chip_select, cspol^1); + writeb(cs->spcon, hw->regs + S3C2410_SPCON); + break; + + case BITBANG_CS_ACTIVE: + writeb(cs->spcon | S3C2410_SPCON_ENSCK, + hw->regs + S3C2410_SPCON); + hw->set_cs(hw->pdata, spi->chip_select, cspol); + break; + } +} + +static int s3c24xx_spi_update_state(struct spi_device *spi, + struct spi_transfer *t) +{ + struct s3c24xx_spi *hw = to_hw(spi); + struct s3c24xx_spi_devstate *cs = spi->controller_state; + unsigned int hz; + unsigned int div; + unsigned long clk; + + hz = t ? t->speed_hz : spi->max_speed_hz; + + if (!hz) + hz = spi->max_speed_hz; + + if (spi->mode != cs->mode) { + u8 spcon = SPCON_DEFAULT | S3C2410_SPCON_ENSCK; + + if (spi->mode & SPI_CPHA) + spcon |= S3C2410_SPCON_CPHA_FMTB; + + if (spi->mode & SPI_CPOL) + spcon |= S3C2410_SPCON_CPOL_HIGH; + + cs->mode = spi->mode; + cs->spcon = spcon; + } + + if (cs->hz != hz) { + clk = clk_get_rate(hw->clk); + div = DIV_ROUND_UP(clk, hz * 2) - 1; + + if (div > 255) + div = 255; + + dev_dbg(&spi->dev, "pre-scaler=%d (wanted %d, got %ld)\n", + div, hz, clk / (2 * (div + 1))); + + cs->hz = hz; + cs->sppre = div; + } + + return 0; +} + +static int s3c24xx_spi_setupxfer(struct spi_device *spi, + struct spi_transfer *t) +{ + struct s3c24xx_spi_devstate *cs = spi->controller_state; + struct s3c24xx_spi *hw = to_hw(spi); + int ret; + + ret = s3c24xx_spi_update_state(spi, t); + if (!ret) + writeb(cs->sppre, hw->regs + S3C2410_SPPRE); + + return ret; +} + +static int s3c24xx_spi_setup(struct spi_device *spi) +{ + struct s3c24xx_spi_devstate *cs = spi->controller_state; + struct s3c24xx_spi *hw = to_hw(spi); + int ret; + + /* allocate settings on the first call */ + if (!cs) { + cs = devm_kzalloc(&spi->dev, + sizeof(struct s3c24xx_spi_devstate), + GFP_KERNEL); + if (!cs) + return -ENOMEM; + + cs->spcon = SPCON_DEFAULT; + cs->hz = -1; + spi->controller_state = cs; + } + + /* initialise the state from the device */ + ret = s3c24xx_spi_update_state(spi, NULL); + if (ret) + return ret; + + mutex_lock(&hw->bitbang.lock); + if (!hw->bitbang.busy) { + hw->bitbang.chipselect(spi, BITBANG_CS_INACTIVE); + /* need to ndelay for 0.5 clocktick ? */ + } + mutex_unlock(&hw->bitbang.lock); + + return 0; +} + +static inline unsigned int hw_txbyte(struct s3c24xx_spi *hw, int count) +{ + return hw->tx ? hw->tx[count] : 0; +} + +#ifdef CONFIG_SPI_S3C24XX_FIQ +/* Support for FIQ based pseudo-DMA to improve the transfer speed. + * + * This code uses the assembly helper in spi_s3c24xx_spi.S which is + * used by the FIQ core to move data between main memory and the peripheral + * block. Since this is code running on the processor, there is no problem + * with cache coherency of the buffers, so we can use any buffer we like. + */ + +/** + * struct spi_fiq_code - FIQ code and header + * @length: The length of the code fragment, excluding this header. + * @ack_offset: The offset from @data to the word to place the IRQ ACK bit at. + * @data: The code itself to install as a FIQ handler. + */ +struct spi_fiq_code { + u32 length; + u32 ack_offset; + u8 data[]; +}; + +/** + * s3c24xx_spi_tryfiq - attempt to claim and setup FIQ for transfer + * @hw: The hardware state. + * + * Claim the FIQ handler (only one can be active at any one time) and + * then setup the correct transfer code for this transfer. + * + * This call updates all the necessary state information if successful, + * so the caller does not need to do anything more than start the transfer + * as normal, since the IRQ will have been re-routed to the FIQ handler. +*/ +static void s3c24xx_spi_tryfiq(struct s3c24xx_spi *hw) +{ + struct pt_regs regs; + enum spi_fiq_mode mode; + struct spi_fiq_code *code; + u32 *ack_ptr = NULL; + int ret; + + if (!hw->fiq_claimed) { + /* try and claim fiq if we haven't got it, and if not + * then return and simply use another transfer method */ + + ret = claim_fiq(&hw->fiq_handler); + if (ret) + return; + } + + if (hw->tx && !hw->rx) + mode = FIQ_MODE_TX; + else if (hw->rx && !hw->tx) + mode = FIQ_MODE_RX; + else + mode = FIQ_MODE_TXRX; + + regs.uregs[fiq_rspi] = (long)hw->regs; + regs.uregs[fiq_rrx] = (long)hw->rx; + regs.uregs[fiq_rtx] = (long)hw->tx + 1; + regs.uregs[fiq_rcount] = hw->len - 1; + + set_fiq_regs(®s); + + if (hw->fiq_mode != mode) { + hw->fiq_mode = mode; + + switch (mode) { + case FIQ_MODE_TX: + code = &s3c24xx_spi_fiq_tx; + break; + case FIQ_MODE_RX: + code = &s3c24xx_spi_fiq_rx; + break; + case FIQ_MODE_TXRX: + code = &s3c24xx_spi_fiq_txrx; + break; + default: + code = NULL; + } + + BUG_ON(!code); + + ack_ptr = (u32 *)&code->data[code->ack_offset]; + set_fiq_handler(&code->data, code->length); + } + + s3c24xx_set_fiq(hw->irq, ack_ptr, true); + + hw->fiq_mode = mode; + hw->fiq_inuse = 1; +} + +/** + * s3c24xx_spi_fiqop - FIQ core code callback + * @pw: Data registered with the handler + * @release: Whether this is a release or a return. + * + * Called by the FIQ code when another module wants to use the FIQ, so + * return whether we are currently using this or not and then update our + * internal state. + */ +static int s3c24xx_spi_fiqop(void *pw, int release) +{ + struct s3c24xx_spi *hw = pw; + int ret = 0; + + if (release) { + if (hw->fiq_inuse) + ret = -EBUSY; + + /* note, we do not need to unroute the FIQ, as the FIQ + * vector code de-routes it to signal the end of transfer */ + + hw->fiq_mode = FIQ_MODE_NONE; + hw->fiq_claimed = 0; + } else { + hw->fiq_claimed = 1; + } + + return ret; +} + +/** + * s3c24xx_spi_initfiq - setup the information for the FIQ core + * @hw: The hardware state. + * + * Setup the fiq_handler block to pass to the FIQ core. + */ +static inline void s3c24xx_spi_initfiq(struct s3c24xx_spi *hw) +{ + hw->fiq_handler.dev_id = hw; + hw->fiq_handler.name = dev_name(hw->dev); + hw->fiq_handler.fiq_op = s3c24xx_spi_fiqop; +} + +/** + * s3c24xx_spi_usefiq - return if we should be using FIQ. + * @hw: The hardware state. + * + * Return true if the platform data specifies whether this channel is + * allowed to use the FIQ. + */ +static inline bool s3c24xx_spi_usefiq(struct s3c24xx_spi *hw) +{ + return hw->pdata->use_fiq; +} + +/** + * s3c24xx_spi_usingfiq - return if channel is using FIQ + * @spi: The hardware state. + * + * Return whether the channel is currently using the FIQ (separate from + * whether the FIQ is claimed). + */ +static inline bool s3c24xx_spi_usingfiq(struct s3c24xx_spi *spi) +{ + return spi->fiq_inuse; +} +#else + +static inline void s3c24xx_spi_initfiq(struct s3c24xx_spi *s) { } +static inline void s3c24xx_spi_tryfiq(struct s3c24xx_spi *s) { } +static inline bool s3c24xx_spi_usefiq(struct s3c24xx_spi *s) { return false; } +static inline bool s3c24xx_spi_usingfiq(struct s3c24xx_spi *s) { return false; } + +#endif /* CONFIG_SPI_S3C24XX_FIQ */ + +static int s3c24xx_spi_txrx(struct spi_device *spi, struct spi_transfer *t) +{ + struct s3c24xx_spi *hw = to_hw(spi); + + hw->tx = t->tx_buf; + hw->rx = t->rx_buf; + hw->len = t->len; + hw->count = 0; + + init_completion(&hw->done); + + hw->fiq_inuse = 0; + if (s3c24xx_spi_usefiq(hw) && t->len >= 3) + s3c24xx_spi_tryfiq(hw); + + /* send the first byte */ + writeb(hw_txbyte(hw, 0), hw->regs + S3C2410_SPTDAT); + + wait_for_completion(&hw->done); + return hw->count; +} + +static irqreturn_t s3c24xx_spi_irq(int irq, void *dev) +{ + struct s3c24xx_spi *hw = dev; + unsigned int spsta = readb(hw->regs + S3C2410_SPSTA); + unsigned int count = hw->count; + + if (spsta & S3C2410_SPSTA_DCOL) { + dev_dbg(hw->dev, "data-collision\n"); + complete(&hw->done); + goto irq_done; + } + + if (!(spsta & S3C2410_SPSTA_READY)) { + dev_dbg(hw->dev, "spi not ready for tx?\n"); + complete(&hw->done); + goto irq_done; + } + + if (!s3c24xx_spi_usingfiq(hw)) { + hw->count++; + + if (hw->rx) + hw->rx[count] = readb(hw->regs + S3C2410_SPRDAT); + + count++; + + if (count < hw->len) + writeb(hw_txbyte(hw, count), hw->regs + S3C2410_SPTDAT); + else + complete(&hw->done); + } else { + hw->count = hw->len; + hw->fiq_inuse = 0; + + if (hw->rx) + hw->rx[hw->len-1] = readb(hw->regs + S3C2410_SPRDAT); + + complete(&hw->done); + } + + irq_done: + return IRQ_HANDLED; +} + +static void s3c24xx_spi_initialsetup(struct s3c24xx_spi *hw) +{ + /* for the moment, permanently enable the clock */ + + clk_enable(hw->clk); + + /* program defaults into the registers */ + + writeb(0xff, hw->regs + S3C2410_SPPRE); + writeb(SPPIN_DEFAULT, hw->regs + S3C2410_SPPIN); + writeb(SPCON_DEFAULT, hw->regs + S3C2410_SPCON); + + if (hw->pdata) { + if (hw->set_cs == s3c24xx_spi_gpiocs) + gpio_direction_output(hw->pdata->pin_cs, 1); + + if (hw->pdata->gpio_setup) + hw->pdata->gpio_setup(hw->pdata, 1); + } +} + +static int s3c24xx_spi_probe(struct platform_device *pdev) +{ + struct s3c2410_spi_info *pdata; + struct s3c24xx_spi *hw; + struct spi_master *master; + int err = 0; + + master = spi_alloc_master(&pdev->dev, sizeof(struct s3c24xx_spi)); + if (master == NULL) { + dev_err(&pdev->dev, "No memory for spi_master\n"); + return -ENOMEM; + } + + hw = spi_master_get_devdata(master); + + hw->master = master; + hw->pdata = pdata = dev_get_platdata(&pdev->dev); + hw->dev = &pdev->dev; + + if (pdata == NULL) { + dev_err(&pdev->dev, "No platform data supplied\n"); + err = -ENOENT; + goto err_no_pdata; + } + + platform_set_drvdata(pdev, hw); + init_completion(&hw->done); + + /* initialise fiq handler */ + + s3c24xx_spi_initfiq(hw); + + /* setup the master state. */ + + /* the spi->mode bits understood by this driver: */ + master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH; + + master->num_chipselect = hw->pdata->num_cs; + master->bus_num = pdata->bus_num; + master->bits_per_word_mask = SPI_BPW_MASK(8); + + /* setup the state for the bitbang driver */ + + hw->bitbang.master = hw->master; + hw->bitbang.setup_transfer = s3c24xx_spi_setupxfer; + hw->bitbang.chipselect = s3c24xx_spi_chipsel; + hw->bitbang.txrx_bufs = s3c24xx_spi_txrx; + + hw->master->setup = s3c24xx_spi_setup; + + dev_dbg(hw->dev, "bitbang at %p\n", &hw->bitbang); + + /* find and map our resources */ + hw->regs = devm_platform_ioremap_resource(pdev, 0); + if (IS_ERR(hw->regs)) { + err = PTR_ERR(hw->regs); + goto err_no_pdata; + } + + hw->irq = platform_get_irq(pdev, 0); + if (hw->irq < 0) { + err = -ENOENT; + goto err_no_pdata; + } + + err = devm_request_irq(&pdev->dev, hw->irq, s3c24xx_spi_irq, 0, + pdev->name, hw); + if (err) { + dev_err(&pdev->dev, "Cannot claim IRQ\n"); + goto err_no_pdata; + } + + hw->clk = devm_clk_get(&pdev->dev, "spi"); + if (IS_ERR(hw->clk)) { + dev_err(&pdev->dev, "No clock for device\n"); + err = PTR_ERR(hw->clk); + goto err_no_pdata; + } + + /* setup any gpio we can */ + + if (!pdata->set_cs) { + if (pdata->pin_cs < 0) { + dev_err(&pdev->dev, "No chipselect pin\n"); + err = -EINVAL; + goto err_register; + } + + err = devm_gpio_request(&pdev->dev, pdata->pin_cs, + dev_name(&pdev->dev)); + if (err) { + dev_err(&pdev->dev, "Failed to get gpio for cs\n"); + goto err_register; + } + + hw->set_cs = s3c24xx_spi_gpiocs; + gpio_direction_output(pdata->pin_cs, 1); + } else + hw->set_cs = pdata->set_cs; + + s3c24xx_spi_initialsetup(hw); + + /* register our spi controller */ + + err = spi_bitbang_start(&hw->bitbang); + if (err) { + dev_err(&pdev->dev, "Failed to register SPI master\n"); + goto err_register; + } + + return 0; + + err_register: + clk_disable(hw->clk); + + err_no_pdata: + spi_master_put(hw->master); + return err; +} + +static int s3c24xx_spi_remove(struct platform_device *dev) +{ + struct s3c24xx_spi *hw = platform_get_drvdata(dev); + + spi_bitbang_stop(&hw->bitbang); + clk_disable(hw->clk); + spi_master_put(hw->master); + return 0; +} + + +#ifdef CONFIG_PM + +static int s3c24xx_spi_suspend(struct device *dev) +{ + struct s3c24xx_spi *hw = dev_get_drvdata(dev); + int ret; + + ret = spi_master_suspend(hw->master); + if (ret) + return ret; + + if (hw->pdata && hw->pdata->gpio_setup) + hw->pdata->gpio_setup(hw->pdata, 0); + + clk_disable(hw->clk); + return 0; +} + +static int s3c24xx_spi_resume(struct device *dev) +{ + struct s3c24xx_spi *hw = dev_get_drvdata(dev); + + s3c24xx_spi_initialsetup(hw); + return spi_master_resume(hw->master); +} + +static const struct dev_pm_ops s3c24xx_spi_pmops = { + .suspend = s3c24xx_spi_suspend, + .resume = s3c24xx_spi_resume, +}; + +#define S3C24XX_SPI_PMOPS &s3c24xx_spi_pmops +#else +#define S3C24XX_SPI_PMOPS NULL +#endif /* CONFIG_PM */ + +MODULE_ALIAS("platform:s3c2410-spi"); +static struct platform_driver s3c24xx_spi_driver = { + .probe = s3c24xx_spi_probe, + .remove = s3c24xx_spi_remove, + .driver = { + .name = "s3c2410-spi", + .pm = S3C24XX_SPI_PMOPS, + }, +}; +module_platform_driver(s3c24xx_spi_driver); + +MODULE_DESCRIPTION("S3C24XX SPI Driver"); +MODULE_AUTHOR("Ben Dooks, <ben@simtec.co.uk>"); +MODULE_LICENSE("GPL"); diff --git a/drivers/spi/spi-s3c64xx.c b/drivers/spi/spi-s3c64xx.c new file mode 100644 index 000000000..d435df1b7 --- /dev/null +++ b/drivers/spi/spi-s3c64xx.c @@ -0,0 +1,1509 @@ +// SPDX-License-Identifier: GPL-2.0+ +// +// Copyright (c) 2009 Samsung Electronics Co., Ltd. +// Jaswinder Singh <jassi.brar@samsung.com> + +#include <linux/init.h> +#include <linux/module.h> +#include <linux/interrupt.h> +#include <linux/delay.h> +#include <linux/clk.h> +#include <linux/dma-mapping.h> +#include <linux/dmaengine.h> +#include <linux/platform_device.h> +#include <linux/pm_runtime.h> +#include <linux/spi/spi.h> +#include <linux/gpio.h> +#include <linux/of.h> +#include <linux/of_gpio.h> + +#include <linux/platform_data/spi-s3c64xx.h> + +#define MAX_SPI_PORTS 6 +#define S3C64XX_SPI_QUIRK_POLL (1 << 0) +#define S3C64XX_SPI_QUIRK_CS_AUTO (1 << 1) +#define AUTOSUSPEND_TIMEOUT 2000 + +/* Registers and bit-fields */ + +#define S3C64XX_SPI_CH_CFG 0x00 +#define S3C64XX_SPI_CLK_CFG 0x04 +#define S3C64XX_SPI_MODE_CFG 0x08 +#define S3C64XX_SPI_CS_REG 0x0C +#define S3C64XX_SPI_INT_EN 0x10 +#define S3C64XX_SPI_STATUS 0x14 +#define S3C64XX_SPI_TX_DATA 0x18 +#define S3C64XX_SPI_RX_DATA 0x1C +#define S3C64XX_SPI_PACKET_CNT 0x20 +#define S3C64XX_SPI_PENDING_CLR 0x24 +#define S3C64XX_SPI_SWAP_CFG 0x28 +#define S3C64XX_SPI_FB_CLK 0x2C + +#define S3C64XX_SPI_CH_HS_EN (1<<6) /* High Speed Enable */ +#define S3C64XX_SPI_CH_SW_RST (1<<5) +#define S3C64XX_SPI_CH_SLAVE (1<<4) +#define S3C64XX_SPI_CPOL_L (1<<3) +#define S3C64XX_SPI_CPHA_B (1<<2) +#define S3C64XX_SPI_CH_RXCH_ON (1<<1) +#define S3C64XX_SPI_CH_TXCH_ON (1<<0) + +#define S3C64XX_SPI_CLKSEL_SRCMSK (3<<9) +#define S3C64XX_SPI_CLKSEL_SRCSHFT 9 +#define S3C64XX_SPI_ENCLK_ENABLE (1<<8) +#define S3C64XX_SPI_PSR_MASK 0xff + +#define S3C64XX_SPI_MODE_CH_TSZ_BYTE (0<<29) +#define S3C64XX_SPI_MODE_CH_TSZ_HALFWORD (1<<29) +#define S3C64XX_SPI_MODE_CH_TSZ_WORD (2<<29) +#define S3C64XX_SPI_MODE_CH_TSZ_MASK (3<<29) +#define S3C64XX_SPI_MODE_BUS_TSZ_BYTE (0<<17) +#define S3C64XX_SPI_MODE_BUS_TSZ_HALFWORD (1<<17) +#define S3C64XX_SPI_MODE_BUS_TSZ_WORD (2<<17) +#define S3C64XX_SPI_MODE_BUS_TSZ_MASK (3<<17) +#define S3C64XX_SPI_MODE_RXDMA_ON (1<<2) +#define S3C64XX_SPI_MODE_TXDMA_ON (1<<1) +#define S3C64XX_SPI_MODE_4BURST (1<<0) + +#define S3C64XX_SPI_CS_NSC_CNT_2 (2<<4) +#define S3C64XX_SPI_CS_AUTO (1<<1) +#define S3C64XX_SPI_CS_SIG_INACT (1<<0) + +#define S3C64XX_SPI_INT_TRAILING_EN (1<<6) +#define S3C64XX_SPI_INT_RX_OVERRUN_EN (1<<5) +#define S3C64XX_SPI_INT_RX_UNDERRUN_EN (1<<4) +#define S3C64XX_SPI_INT_TX_OVERRUN_EN (1<<3) +#define S3C64XX_SPI_INT_TX_UNDERRUN_EN (1<<2) +#define S3C64XX_SPI_INT_RX_FIFORDY_EN (1<<1) +#define S3C64XX_SPI_INT_TX_FIFORDY_EN (1<<0) + +#define S3C64XX_SPI_ST_RX_OVERRUN_ERR (1<<5) +#define S3C64XX_SPI_ST_RX_UNDERRUN_ERR (1<<4) +#define S3C64XX_SPI_ST_TX_OVERRUN_ERR (1<<3) +#define S3C64XX_SPI_ST_TX_UNDERRUN_ERR (1<<2) +#define S3C64XX_SPI_ST_RX_FIFORDY (1<<1) +#define S3C64XX_SPI_ST_TX_FIFORDY (1<<0) + +#define S3C64XX_SPI_PACKET_CNT_EN (1<<16) +#define S3C64XX_SPI_PACKET_CNT_MASK GENMASK(15, 0) + +#define S3C64XX_SPI_PND_TX_UNDERRUN_CLR (1<<4) +#define S3C64XX_SPI_PND_TX_OVERRUN_CLR (1<<3) +#define S3C64XX_SPI_PND_RX_UNDERRUN_CLR (1<<2) +#define S3C64XX_SPI_PND_RX_OVERRUN_CLR (1<<1) +#define S3C64XX_SPI_PND_TRAILING_CLR (1<<0) + +#define S3C64XX_SPI_SWAP_RX_HALF_WORD (1<<7) +#define S3C64XX_SPI_SWAP_RX_BYTE (1<<6) +#define S3C64XX_SPI_SWAP_RX_BIT (1<<5) +#define S3C64XX_SPI_SWAP_RX_EN (1<<4) +#define S3C64XX_SPI_SWAP_TX_HALF_WORD (1<<3) +#define S3C64XX_SPI_SWAP_TX_BYTE (1<<2) +#define S3C64XX_SPI_SWAP_TX_BIT (1<<1) +#define S3C64XX_SPI_SWAP_TX_EN (1<<0) + +#define S3C64XX_SPI_FBCLK_MSK (3<<0) + +#define FIFO_LVL_MASK(i) ((i)->port_conf->fifo_lvl_mask[i->port_id]) +#define S3C64XX_SPI_ST_TX_DONE(v, i) (((v) & \ + (1 << (i)->port_conf->tx_st_done)) ? 1 : 0) +#define TX_FIFO_LVL(v, i) (((v) >> 6) & FIFO_LVL_MASK(i)) +#define RX_FIFO_LVL(v, i) (((v) >> (i)->port_conf->rx_lvl_offset) & \ + FIFO_LVL_MASK(i)) + +#define S3C64XX_SPI_MAX_TRAILCNT 0x3ff +#define S3C64XX_SPI_TRAILCNT_OFF 19 + +#define S3C64XX_SPI_TRAILCNT S3C64XX_SPI_MAX_TRAILCNT + +#define msecs_to_loops(t) (loops_per_jiffy / 1000 * HZ * t) +#define is_polling(x) (x->port_conf->quirks & S3C64XX_SPI_QUIRK_POLL) + +#define RXBUSY (1<<2) +#define TXBUSY (1<<3) + +struct s3c64xx_spi_dma_data { + struct dma_chan *ch; + dma_cookie_t cookie; + enum dma_transfer_direction direction; +}; + +/** + * struct s3c64xx_spi_info - SPI Controller hardware info + * @fifo_lvl_mask: Bit-mask for {TX|RX}_FIFO_LVL bits in SPI_STATUS register. + * @rx_lvl_offset: Bit offset of RX_FIFO_LVL bits in SPI_STATUS regiter. + * @tx_st_done: Bit offset of TX_DONE bit in SPI_STATUS regiter. + * @quirks: Bitmask of known quirks + * @high_speed: True, if the controller supports HIGH_SPEED_EN bit. + * @clk_from_cmu: True, if the controller does not include a clock mux and + * prescaler unit. + * @clk_ioclk: True if clock is present on this device + * + * The Samsung s3c64xx SPI controller are used on various Samsung SoC's but + * differ in some aspects such as the size of the fifo and spi bus clock + * setup. Such differences are specified to the driver using this structure + * which is provided as driver data to the driver. + */ +struct s3c64xx_spi_port_config { + int fifo_lvl_mask[MAX_SPI_PORTS]; + int rx_lvl_offset; + int tx_st_done; + int quirks; + bool high_speed; + bool clk_from_cmu; + bool clk_ioclk; +}; + +/** + * struct s3c64xx_spi_driver_data - Runtime info holder for SPI driver. + * @clk: Pointer to the spi clock. + * @src_clk: Pointer to the clock used to generate SPI signals. + * @ioclk: Pointer to the i/o clock between master and slave + * @pdev: Pointer to device's platform device data + * @master: Pointer to the SPI Protocol master. + * @cntrlr_info: Platform specific data for the controller this driver manages. + * @lock: Controller specific lock. + * @state: Set of FLAGS to indicate status. + * @sfr_start: BUS address of SPI controller regs. + * @regs: Pointer to ioremap'ed controller registers. + * @xfer_completion: To indicate completion of xfer task. + * @cur_mode: Stores the active configuration of the controller. + * @cur_bpw: Stores the active bits per word settings. + * @cur_speed: Current clock speed + * @rx_dma: Local receive DMA data (e.g. chan and direction) + * @tx_dma: Local transmit DMA data (e.g. chan and direction) + * @port_conf: Local SPI port configuartion data + * @port_id: Port identification number + */ +struct s3c64xx_spi_driver_data { + void __iomem *regs; + struct clk *clk; + struct clk *src_clk; + struct clk *ioclk; + struct platform_device *pdev; + struct spi_master *master; + struct s3c64xx_spi_info *cntrlr_info; + spinlock_t lock; + unsigned long sfr_start; + struct completion xfer_completion; + unsigned state; + unsigned cur_mode, cur_bpw; + unsigned cur_speed; + struct s3c64xx_spi_dma_data rx_dma; + struct s3c64xx_spi_dma_data tx_dma; + struct s3c64xx_spi_port_config *port_conf; + unsigned int port_id; +}; + +static void s3c64xx_flush_fifo(struct s3c64xx_spi_driver_data *sdd) +{ + void __iomem *regs = sdd->regs; + unsigned long loops; + u32 val; + + writel(0, regs + S3C64XX_SPI_PACKET_CNT); + + val = readl(regs + S3C64XX_SPI_CH_CFG); + val &= ~(S3C64XX_SPI_CH_RXCH_ON | S3C64XX_SPI_CH_TXCH_ON); + writel(val, regs + S3C64XX_SPI_CH_CFG); + + val = readl(regs + S3C64XX_SPI_CH_CFG); + val |= S3C64XX_SPI_CH_SW_RST; + val &= ~S3C64XX_SPI_CH_HS_EN; + writel(val, regs + S3C64XX_SPI_CH_CFG); + + /* Flush TxFIFO*/ + loops = msecs_to_loops(1); + do { + val = readl(regs + S3C64XX_SPI_STATUS); + } while (TX_FIFO_LVL(val, sdd) && loops--); + + if (loops == 0) + dev_warn(&sdd->pdev->dev, "Timed out flushing TX FIFO\n"); + + /* Flush RxFIFO*/ + loops = msecs_to_loops(1); + do { + val = readl(regs + S3C64XX_SPI_STATUS); + if (RX_FIFO_LVL(val, sdd)) + readl(regs + S3C64XX_SPI_RX_DATA); + else + break; + } while (loops--); + + if (loops == 0) + dev_warn(&sdd->pdev->dev, "Timed out flushing RX FIFO\n"); + + val = readl(regs + S3C64XX_SPI_CH_CFG); + val &= ~S3C64XX_SPI_CH_SW_RST; + writel(val, regs + S3C64XX_SPI_CH_CFG); + + val = readl(regs + S3C64XX_SPI_MODE_CFG); + val &= ~(S3C64XX_SPI_MODE_TXDMA_ON | S3C64XX_SPI_MODE_RXDMA_ON); + writel(val, regs + S3C64XX_SPI_MODE_CFG); +} + +static void s3c64xx_spi_dmacb(void *data) +{ + struct s3c64xx_spi_driver_data *sdd; + struct s3c64xx_spi_dma_data *dma = data; + unsigned long flags; + + if (dma->direction == DMA_DEV_TO_MEM) + sdd = container_of(data, + struct s3c64xx_spi_driver_data, rx_dma); + else + sdd = container_of(data, + struct s3c64xx_spi_driver_data, tx_dma); + + spin_lock_irqsave(&sdd->lock, flags); + + if (dma->direction == DMA_DEV_TO_MEM) { + sdd->state &= ~RXBUSY; + if (!(sdd->state & TXBUSY)) + complete(&sdd->xfer_completion); + } else { + sdd->state &= ~TXBUSY; + if (!(sdd->state & RXBUSY)) + complete(&sdd->xfer_completion); + } + + spin_unlock_irqrestore(&sdd->lock, flags); +} + +static int prepare_dma(struct s3c64xx_spi_dma_data *dma, + struct sg_table *sgt) +{ + struct s3c64xx_spi_driver_data *sdd; + struct dma_slave_config config; + struct dma_async_tx_descriptor *desc; + int ret; + + memset(&config, 0, sizeof(config)); + + if (dma->direction == DMA_DEV_TO_MEM) { + sdd = container_of((void *)dma, + struct s3c64xx_spi_driver_data, rx_dma); + config.direction = dma->direction; + config.src_addr = sdd->sfr_start + S3C64XX_SPI_RX_DATA; + config.src_addr_width = sdd->cur_bpw / 8; + config.src_maxburst = 1; + dmaengine_slave_config(dma->ch, &config); + } else { + sdd = container_of((void *)dma, + struct s3c64xx_spi_driver_data, tx_dma); + config.direction = dma->direction; + config.dst_addr = sdd->sfr_start + S3C64XX_SPI_TX_DATA; + config.dst_addr_width = sdd->cur_bpw / 8; + config.dst_maxburst = 1; + dmaengine_slave_config(dma->ch, &config); + } + + desc = dmaengine_prep_slave_sg(dma->ch, sgt->sgl, sgt->nents, + dma->direction, DMA_PREP_INTERRUPT); + if (!desc) { + dev_err(&sdd->pdev->dev, "unable to prepare %s scatterlist", + dma->direction == DMA_DEV_TO_MEM ? "rx" : "tx"); + return -ENOMEM; + } + + desc->callback = s3c64xx_spi_dmacb; + desc->callback_param = dma; + + dma->cookie = dmaengine_submit(desc); + ret = dma_submit_error(dma->cookie); + if (ret) { + dev_err(&sdd->pdev->dev, "DMA submission failed"); + return -EIO; + } + + dma_async_issue_pending(dma->ch); + return 0; +} + +static void s3c64xx_spi_set_cs(struct spi_device *spi, bool enable) +{ + struct s3c64xx_spi_driver_data *sdd = + spi_master_get_devdata(spi->master); + + if (sdd->cntrlr_info->no_cs) + return; + + if (enable) { + if (!(sdd->port_conf->quirks & S3C64XX_SPI_QUIRK_CS_AUTO)) { + writel(0, sdd->regs + S3C64XX_SPI_CS_REG); + } else { + u32 ssel = readl(sdd->regs + S3C64XX_SPI_CS_REG); + + ssel |= (S3C64XX_SPI_CS_AUTO | + S3C64XX_SPI_CS_NSC_CNT_2); + writel(ssel, sdd->regs + S3C64XX_SPI_CS_REG); + } + } else { + if (!(sdd->port_conf->quirks & S3C64XX_SPI_QUIRK_CS_AUTO)) + writel(S3C64XX_SPI_CS_SIG_INACT, + sdd->regs + S3C64XX_SPI_CS_REG); + } +} + +static int s3c64xx_spi_prepare_transfer(struct spi_master *spi) +{ + struct s3c64xx_spi_driver_data *sdd = spi_master_get_devdata(spi); + + if (is_polling(sdd)) + return 0; + + spi->dma_rx = sdd->rx_dma.ch; + spi->dma_tx = sdd->tx_dma.ch; + + return 0; +} + +static bool s3c64xx_spi_can_dma(struct spi_master *master, + struct spi_device *spi, + struct spi_transfer *xfer) +{ + struct s3c64xx_spi_driver_data *sdd = spi_master_get_devdata(master); + + return xfer->len > (FIFO_LVL_MASK(sdd) >> 1) + 1; +} + +static int s3c64xx_enable_datapath(struct s3c64xx_spi_driver_data *sdd, + struct spi_transfer *xfer, int dma_mode) +{ + void __iomem *regs = sdd->regs; + u32 modecfg, chcfg; + int ret = 0; + + modecfg = readl(regs + S3C64XX_SPI_MODE_CFG); + modecfg &= ~(S3C64XX_SPI_MODE_TXDMA_ON | S3C64XX_SPI_MODE_RXDMA_ON); + + chcfg = readl(regs + S3C64XX_SPI_CH_CFG); + chcfg &= ~S3C64XX_SPI_CH_TXCH_ON; + + if (dma_mode) { + chcfg &= ~S3C64XX_SPI_CH_RXCH_ON; + } else { + /* Always shift in data in FIFO, even if xfer is Tx only, + * this helps setting PCKT_CNT value for generating clocks + * as exactly needed. + */ + chcfg |= S3C64XX_SPI_CH_RXCH_ON; + writel(((xfer->len * 8 / sdd->cur_bpw) & 0xffff) + | S3C64XX_SPI_PACKET_CNT_EN, + regs + S3C64XX_SPI_PACKET_CNT); + } + + if (xfer->tx_buf != NULL) { + sdd->state |= TXBUSY; + chcfg |= S3C64XX_SPI_CH_TXCH_ON; + if (dma_mode) { + modecfg |= S3C64XX_SPI_MODE_TXDMA_ON; + ret = prepare_dma(&sdd->tx_dma, &xfer->tx_sg); + } else { + switch (sdd->cur_bpw) { + case 32: + iowrite32_rep(regs + S3C64XX_SPI_TX_DATA, + xfer->tx_buf, xfer->len / 4); + break; + case 16: + iowrite16_rep(regs + S3C64XX_SPI_TX_DATA, + xfer->tx_buf, xfer->len / 2); + break; + default: + iowrite8_rep(regs + S3C64XX_SPI_TX_DATA, + xfer->tx_buf, xfer->len); + break; + } + } + } + + if (xfer->rx_buf != NULL) { + sdd->state |= RXBUSY; + + if (sdd->port_conf->high_speed && sdd->cur_speed >= 30000000UL + && !(sdd->cur_mode & SPI_CPHA)) + chcfg |= S3C64XX_SPI_CH_HS_EN; + + if (dma_mode) { + modecfg |= S3C64XX_SPI_MODE_RXDMA_ON; + chcfg |= S3C64XX_SPI_CH_RXCH_ON; + writel(((xfer->len * 8 / sdd->cur_bpw) & 0xffff) + | S3C64XX_SPI_PACKET_CNT_EN, + regs + S3C64XX_SPI_PACKET_CNT); + ret = prepare_dma(&sdd->rx_dma, &xfer->rx_sg); + } + } + + if (ret) + return ret; + + writel(modecfg, regs + S3C64XX_SPI_MODE_CFG); + writel(chcfg, regs + S3C64XX_SPI_CH_CFG); + + return 0; +} + +static u32 s3c64xx_spi_wait_for_timeout(struct s3c64xx_spi_driver_data *sdd, + int timeout_ms) +{ + void __iomem *regs = sdd->regs; + unsigned long val = 1; + u32 status; + + /* max fifo depth available */ + u32 max_fifo = (FIFO_LVL_MASK(sdd) >> 1) + 1; + + if (timeout_ms) + val = msecs_to_loops(timeout_ms); + + do { + status = readl(regs + S3C64XX_SPI_STATUS); + } while (RX_FIFO_LVL(status, sdd) < max_fifo && --val); + + /* return the actual received data length */ + return RX_FIFO_LVL(status, sdd); +} + +static int s3c64xx_wait_for_dma(struct s3c64xx_spi_driver_data *sdd, + struct spi_transfer *xfer) +{ + void __iomem *regs = sdd->regs; + unsigned long val; + u32 status; + int ms; + + /* millisecs to xfer 'len' bytes @ 'cur_speed' */ + ms = xfer->len * 8 * 1000 / sdd->cur_speed; + ms += 30; /* some tolerance */ + ms = max(ms, 100); /* minimum timeout */ + + val = msecs_to_jiffies(ms) + 10; + val = wait_for_completion_timeout(&sdd->xfer_completion, val); + + /* + * If the previous xfer was completed within timeout, then + * proceed further else return -EIO. + * DmaTx returns after simply writing data in the FIFO, + * w/o waiting for real transmission on the bus to finish. + * DmaRx returns only after Dma read data from FIFO which + * needs bus transmission to finish, so we don't worry if + * Xfer involved Rx(with or without Tx). + */ + if (val && !xfer->rx_buf) { + val = msecs_to_loops(10); + status = readl(regs + S3C64XX_SPI_STATUS); + while ((TX_FIFO_LVL(status, sdd) + || !S3C64XX_SPI_ST_TX_DONE(status, sdd)) + && --val) { + cpu_relax(); + status = readl(regs + S3C64XX_SPI_STATUS); + } + + } + + /* If timed out while checking rx/tx status return error */ + if (!val) + return -EIO; + + return 0; +} + +static int s3c64xx_wait_for_pio(struct s3c64xx_spi_driver_data *sdd, + struct spi_transfer *xfer) +{ + void __iomem *regs = sdd->regs; + unsigned long val; + u32 status; + int loops; + u32 cpy_len; + u8 *buf; + int ms; + + /* millisecs to xfer 'len' bytes @ 'cur_speed' */ + ms = xfer->len * 8 * 1000 / sdd->cur_speed; + ms += 10; /* some tolerance */ + + val = msecs_to_loops(ms); + do { + status = readl(regs + S3C64XX_SPI_STATUS); + } while (RX_FIFO_LVL(status, sdd) < xfer->len && --val); + + if (!val) + return -EIO; + + /* If it was only Tx */ + if (!xfer->rx_buf) { + sdd->state &= ~TXBUSY; + return 0; + } + + /* + * If the receive length is bigger than the controller fifo + * size, calculate the loops and read the fifo as many times. + * loops = length / max fifo size (calculated by using the + * fifo mask). + * For any size less than the fifo size the below code is + * executed atleast once. + */ + loops = xfer->len / ((FIFO_LVL_MASK(sdd) >> 1) + 1); + buf = xfer->rx_buf; + do { + /* wait for data to be received in the fifo */ + cpy_len = s3c64xx_spi_wait_for_timeout(sdd, + (loops ? ms : 0)); + + switch (sdd->cur_bpw) { + case 32: + ioread32_rep(regs + S3C64XX_SPI_RX_DATA, + buf, cpy_len / 4); + break; + case 16: + ioread16_rep(regs + S3C64XX_SPI_RX_DATA, + buf, cpy_len / 2); + break; + default: + ioread8_rep(regs + S3C64XX_SPI_RX_DATA, + buf, cpy_len); + break; + } + + buf = buf + cpy_len; + } while (loops--); + sdd->state &= ~RXBUSY; + + return 0; +} + +static int s3c64xx_spi_config(struct s3c64xx_spi_driver_data *sdd) +{ + void __iomem *regs = sdd->regs; + int ret; + u32 val; + + /* Disable Clock */ + if (!sdd->port_conf->clk_from_cmu) { + val = readl(regs + S3C64XX_SPI_CLK_CFG); + val &= ~S3C64XX_SPI_ENCLK_ENABLE; + writel(val, regs + S3C64XX_SPI_CLK_CFG); + } + + /* Set Polarity and Phase */ + val = readl(regs + S3C64XX_SPI_CH_CFG); + val &= ~(S3C64XX_SPI_CH_SLAVE | + S3C64XX_SPI_CPOL_L | + S3C64XX_SPI_CPHA_B); + + if (sdd->cur_mode & SPI_CPOL) + val |= S3C64XX_SPI_CPOL_L; + + if (sdd->cur_mode & SPI_CPHA) + val |= S3C64XX_SPI_CPHA_B; + + writel(val, regs + S3C64XX_SPI_CH_CFG); + + /* Set Channel & DMA Mode */ + val = readl(regs + S3C64XX_SPI_MODE_CFG); + val &= ~(S3C64XX_SPI_MODE_BUS_TSZ_MASK + | S3C64XX_SPI_MODE_CH_TSZ_MASK); + + switch (sdd->cur_bpw) { + case 32: + val |= S3C64XX_SPI_MODE_BUS_TSZ_WORD; + val |= S3C64XX_SPI_MODE_CH_TSZ_WORD; + break; + case 16: + val |= S3C64XX_SPI_MODE_BUS_TSZ_HALFWORD; + val |= S3C64XX_SPI_MODE_CH_TSZ_HALFWORD; + break; + default: + val |= S3C64XX_SPI_MODE_BUS_TSZ_BYTE; + val |= S3C64XX_SPI_MODE_CH_TSZ_BYTE; + break; + } + + writel(val, regs + S3C64XX_SPI_MODE_CFG); + + if (sdd->port_conf->clk_from_cmu) { + /* The src_clk clock is divided internally by 2 */ + ret = clk_set_rate(sdd->src_clk, sdd->cur_speed * 2); + if (ret) + return ret; + sdd->cur_speed = clk_get_rate(sdd->src_clk) / 2; + } else { + /* Configure Clock */ + val = readl(regs + S3C64XX_SPI_CLK_CFG); + val &= ~S3C64XX_SPI_PSR_MASK; + val |= ((clk_get_rate(sdd->src_clk) / sdd->cur_speed / 2 - 1) + & S3C64XX_SPI_PSR_MASK); + writel(val, regs + S3C64XX_SPI_CLK_CFG); + + /* Enable Clock */ + val = readl(regs + S3C64XX_SPI_CLK_CFG); + val |= S3C64XX_SPI_ENCLK_ENABLE; + writel(val, regs + S3C64XX_SPI_CLK_CFG); + } + + return 0; +} + +#define XFER_DMAADDR_INVALID DMA_BIT_MASK(32) + +static int s3c64xx_spi_prepare_message(struct spi_master *master, + struct spi_message *msg) +{ + struct s3c64xx_spi_driver_data *sdd = spi_master_get_devdata(master); + struct spi_device *spi = msg->spi; + struct s3c64xx_spi_csinfo *cs = spi->controller_data; + + /* Configure feedback delay */ + writel(cs->fb_delay & 0x3, sdd->regs + S3C64XX_SPI_FB_CLK); + + return 0; +} + +static size_t s3c64xx_spi_max_transfer_size(struct spi_device *spi) +{ + struct spi_controller *ctlr = spi->controller; + + return ctlr->can_dma ? S3C64XX_SPI_PACKET_CNT_MASK : SIZE_MAX; +} + +static int s3c64xx_spi_transfer_one(struct spi_master *master, + struct spi_device *spi, + struct spi_transfer *xfer) +{ + struct s3c64xx_spi_driver_data *sdd = spi_master_get_devdata(master); + const unsigned int fifo_len = (FIFO_LVL_MASK(sdd) >> 1) + 1; + const void *tx_buf = NULL; + void *rx_buf = NULL; + int target_len = 0, origin_len = 0; + int use_dma = 0; + int status; + u32 speed; + u8 bpw; + unsigned long flags; + + reinit_completion(&sdd->xfer_completion); + + /* Only BPW and Speed may change across transfers */ + bpw = xfer->bits_per_word; + speed = xfer->speed_hz; + + if (bpw != sdd->cur_bpw || speed != sdd->cur_speed) { + sdd->cur_bpw = bpw; + sdd->cur_speed = speed; + sdd->cur_mode = spi->mode; + status = s3c64xx_spi_config(sdd); + if (status) + return status; + } + + if (!is_polling(sdd) && (xfer->len > fifo_len) && + sdd->rx_dma.ch && sdd->tx_dma.ch) { + use_dma = 1; + + } else if (is_polling(sdd) && xfer->len > fifo_len) { + tx_buf = xfer->tx_buf; + rx_buf = xfer->rx_buf; + origin_len = xfer->len; + + target_len = xfer->len; + if (xfer->len > fifo_len) + xfer->len = fifo_len; + } + + do { + spin_lock_irqsave(&sdd->lock, flags); + + /* Pending only which is to be done */ + sdd->state &= ~RXBUSY; + sdd->state &= ~TXBUSY; + + /* Start the signals */ + s3c64xx_spi_set_cs(spi, true); + + status = s3c64xx_enable_datapath(sdd, xfer, use_dma); + + spin_unlock_irqrestore(&sdd->lock, flags); + + if (status) { + dev_err(&spi->dev, "failed to enable data path for transfer: %d\n", status); + break; + } + + if (use_dma) + status = s3c64xx_wait_for_dma(sdd, xfer); + else + status = s3c64xx_wait_for_pio(sdd, xfer); + + if (status) { + dev_err(&spi->dev, + "I/O Error: rx-%d tx-%d rx-%c tx-%c len-%d dma-%d res-(%d)\n", + xfer->rx_buf ? 1 : 0, xfer->tx_buf ? 1 : 0, + (sdd->state & RXBUSY) ? 'f' : 'p', + (sdd->state & TXBUSY) ? 'f' : 'p', + xfer->len, use_dma ? 1 : 0, status); + + if (use_dma) { + struct dma_tx_state s; + + if (xfer->tx_buf && (sdd->state & TXBUSY)) { + dmaengine_pause(sdd->tx_dma.ch); + dmaengine_tx_status(sdd->tx_dma.ch, sdd->tx_dma.cookie, &s); + dmaengine_terminate_all(sdd->tx_dma.ch); + dev_err(&spi->dev, "TX residue: %d\n", s.residue); + + } + if (xfer->rx_buf && (sdd->state & RXBUSY)) { + dmaengine_pause(sdd->rx_dma.ch); + dmaengine_tx_status(sdd->rx_dma.ch, sdd->rx_dma.cookie, &s); + dmaengine_terminate_all(sdd->rx_dma.ch); + dev_err(&spi->dev, "RX residue: %d\n", s.residue); + } + } + } else { + s3c64xx_flush_fifo(sdd); + } + if (target_len > 0) { + target_len -= xfer->len; + + if (xfer->tx_buf) + xfer->tx_buf += xfer->len; + + if (xfer->rx_buf) + xfer->rx_buf += xfer->len; + + if (target_len > fifo_len) + xfer->len = fifo_len; + else + xfer->len = target_len; + } + } while (target_len > 0); + + if (origin_len) { + /* Restore original xfer buffers and length */ + xfer->tx_buf = tx_buf; + xfer->rx_buf = rx_buf; + xfer->len = origin_len; + } + + return status; +} + +static struct s3c64xx_spi_csinfo *s3c64xx_get_slave_ctrldata( + struct spi_device *spi) +{ + struct s3c64xx_spi_csinfo *cs; + struct device_node *slave_np, *data_np = NULL; + u32 fb_delay = 0; + + slave_np = spi->dev.of_node; + if (!slave_np) { + dev_err(&spi->dev, "device node not found\n"); + return ERR_PTR(-EINVAL); + } + + data_np = of_get_child_by_name(slave_np, "controller-data"); + if (!data_np) { + dev_err(&spi->dev, "child node 'controller-data' not found\n"); + return ERR_PTR(-EINVAL); + } + + cs = kzalloc(sizeof(*cs), GFP_KERNEL); + if (!cs) { + of_node_put(data_np); + return ERR_PTR(-ENOMEM); + } + + of_property_read_u32(data_np, "samsung,spi-feedback-delay", &fb_delay); + cs->fb_delay = fb_delay; + of_node_put(data_np); + return cs; +} + +/* + * Here we only check the validity of requested configuration + * and save the configuration in a local data-structure. + * The controller is actually configured only just before we + * get a message to transfer. + */ +static int s3c64xx_spi_setup(struct spi_device *spi) +{ + struct s3c64xx_spi_csinfo *cs = spi->controller_data; + struct s3c64xx_spi_driver_data *sdd; + int err; + + sdd = spi_master_get_devdata(spi->master); + if (spi->dev.of_node) { + cs = s3c64xx_get_slave_ctrldata(spi); + spi->controller_data = cs; + } else if (cs) { + /* On non-DT platforms the SPI core will set spi->cs_gpio + * to -ENOENT. The GPIO pin used to drive the chip select + * is defined by using platform data so spi->cs_gpio value + * has to be override to have the proper GPIO pin number. + */ + spi->cs_gpio = cs->line; + } + + if (IS_ERR_OR_NULL(cs)) { + dev_err(&spi->dev, "No CS for SPI(%d)\n", spi->chip_select); + return -ENODEV; + } + + if (!spi_get_ctldata(spi)) { + if (gpio_is_valid(spi->cs_gpio)) { + err = gpio_request_one(spi->cs_gpio, GPIOF_OUT_INIT_HIGH, + dev_name(&spi->dev)); + if (err) { + dev_err(&spi->dev, + "Failed to get /CS gpio [%d]: %d\n", + spi->cs_gpio, err); + goto err_gpio_req; + } + } + + spi_set_ctldata(spi, cs); + } + + pm_runtime_get_sync(&sdd->pdev->dev); + + /* Check if we can provide the requested rate */ + if (!sdd->port_conf->clk_from_cmu) { + u32 psr, speed; + + /* Max possible */ + speed = clk_get_rate(sdd->src_clk) / 2 / (0 + 1); + + if (spi->max_speed_hz > speed) + spi->max_speed_hz = speed; + + psr = clk_get_rate(sdd->src_clk) / 2 / spi->max_speed_hz - 1; + psr &= S3C64XX_SPI_PSR_MASK; + if (psr == S3C64XX_SPI_PSR_MASK) + psr--; + + speed = clk_get_rate(sdd->src_clk) / 2 / (psr + 1); + if (spi->max_speed_hz < speed) { + if (psr+1 < S3C64XX_SPI_PSR_MASK) { + psr++; + } else { + err = -EINVAL; + goto setup_exit; + } + } + + speed = clk_get_rate(sdd->src_clk) / 2 / (psr + 1); + if (spi->max_speed_hz >= speed) { + spi->max_speed_hz = speed; + } else { + dev_err(&spi->dev, "Can't set %dHz transfer speed\n", + spi->max_speed_hz); + err = -EINVAL; + goto setup_exit; + } + } + + pm_runtime_mark_last_busy(&sdd->pdev->dev); + pm_runtime_put_autosuspend(&sdd->pdev->dev); + s3c64xx_spi_set_cs(spi, false); + + return 0; + +setup_exit: + pm_runtime_mark_last_busy(&sdd->pdev->dev); + pm_runtime_put_autosuspend(&sdd->pdev->dev); + /* setup() returns with device de-selected */ + s3c64xx_spi_set_cs(spi, false); + + if (gpio_is_valid(spi->cs_gpio)) + gpio_free(spi->cs_gpio); + spi_set_ctldata(spi, NULL); + +err_gpio_req: + if (spi->dev.of_node) + kfree(cs); + + return err; +} + +static void s3c64xx_spi_cleanup(struct spi_device *spi) +{ + struct s3c64xx_spi_csinfo *cs = spi_get_ctldata(spi); + + if (gpio_is_valid(spi->cs_gpio)) { + gpio_free(spi->cs_gpio); + if (spi->dev.of_node) + kfree(cs); + else { + /* On non-DT platforms, the SPI core sets + * spi->cs_gpio to -ENOENT and .setup() + * overrides it with the GPIO pin value + * passed using platform data. + */ + spi->cs_gpio = -ENOENT; + } + } + + spi_set_ctldata(spi, NULL); +} + +static irqreturn_t s3c64xx_spi_irq(int irq, void *data) +{ + struct s3c64xx_spi_driver_data *sdd = data; + struct spi_master *spi = sdd->master; + unsigned int val, clr = 0; + + val = readl(sdd->regs + S3C64XX_SPI_STATUS); + + if (val & S3C64XX_SPI_ST_RX_OVERRUN_ERR) { + clr = S3C64XX_SPI_PND_RX_OVERRUN_CLR; + dev_err(&spi->dev, "RX overrun\n"); + } + if (val & S3C64XX_SPI_ST_RX_UNDERRUN_ERR) { + clr |= S3C64XX_SPI_PND_RX_UNDERRUN_CLR; + dev_err(&spi->dev, "RX underrun\n"); + } + if (val & S3C64XX_SPI_ST_TX_OVERRUN_ERR) { + clr |= S3C64XX_SPI_PND_TX_OVERRUN_CLR; + dev_err(&spi->dev, "TX overrun\n"); + } + if (val & S3C64XX_SPI_ST_TX_UNDERRUN_ERR) { + clr |= S3C64XX_SPI_PND_TX_UNDERRUN_CLR; + dev_err(&spi->dev, "TX underrun\n"); + } + + /* Clear the pending irq by setting and then clearing it */ + writel(clr, sdd->regs + S3C64XX_SPI_PENDING_CLR); + writel(0, sdd->regs + S3C64XX_SPI_PENDING_CLR); + + return IRQ_HANDLED; +} + +static void s3c64xx_spi_hwinit(struct s3c64xx_spi_driver_data *sdd) +{ + struct s3c64xx_spi_info *sci = sdd->cntrlr_info; + void __iomem *regs = sdd->regs; + unsigned int val; + + sdd->cur_speed = 0; + + if (sci->no_cs) + writel(0, sdd->regs + S3C64XX_SPI_CS_REG); + else if (!(sdd->port_conf->quirks & S3C64XX_SPI_QUIRK_CS_AUTO)) + writel(S3C64XX_SPI_CS_SIG_INACT, sdd->regs + S3C64XX_SPI_CS_REG); + + /* Disable Interrupts - we use Polling if not DMA mode */ + writel(0, regs + S3C64XX_SPI_INT_EN); + + if (!sdd->port_conf->clk_from_cmu) + writel(sci->src_clk_nr << S3C64XX_SPI_CLKSEL_SRCSHFT, + regs + S3C64XX_SPI_CLK_CFG); + writel(0, regs + S3C64XX_SPI_MODE_CFG); + writel(0, regs + S3C64XX_SPI_PACKET_CNT); + + /* Clear any irq pending bits, should set and clear the bits */ + val = S3C64XX_SPI_PND_RX_OVERRUN_CLR | + S3C64XX_SPI_PND_RX_UNDERRUN_CLR | + S3C64XX_SPI_PND_TX_OVERRUN_CLR | + S3C64XX_SPI_PND_TX_UNDERRUN_CLR; + writel(val, regs + S3C64XX_SPI_PENDING_CLR); + writel(0, regs + S3C64XX_SPI_PENDING_CLR); + + writel(0, regs + S3C64XX_SPI_SWAP_CFG); + + val = readl(regs + S3C64XX_SPI_MODE_CFG); + val &= ~S3C64XX_SPI_MODE_4BURST; + val &= ~(S3C64XX_SPI_MAX_TRAILCNT << S3C64XX_SPI_TRAILCNT_OFF); + val |= (S3C64XX_SPI_TRAILCNT << S3C64XX_SPI_TRAILCNT_OFF); + writel(val, regs + S3C64XX_SPI_MODE_CFG); + + s3c64xx_flush_fifo(sdd); +} + +#ifdef CONFIG_OF +static struct s3c64xx_spi_info *s3c64xx_spi_parse_dt(struct device *dev) +{ + struct s3c64xx_spi_info *sci; + u32 temp; + + sci = devm_kzalloc(dev, sizeof(*sci), GFP_KERNEL); + if (!sci) + return ERR_PTR(-ENOMEM); + + if (of_property_read_u32(dev->of_node, "samsung,spi-src-clk", &temp)) { + dev_warn(dev, "spi bus clock parent not specified, using clock at index 0 as parent\n"); + sci->src_clk_nr = 0; + } else { + sci->src_clk_nr = temp; + } + + if (of_property_read_u32(dev->of_node, "num-cs", &temp)) { + dev_warn(dev, "number of chip select lines not specified, assuming 1 chip select line\n"); + sci->num_cs = 1; + } else { + sci->num_cs = temp; + } + + sci->no_cs = of_property_read_bool(dev->of_node, "no-cs-readback"); + + return sci; +} +#else +static struct s3c64xx_spi_info *s3c64xx_spi_parse_dt(struct device *dev) +{ + return dev_get_platdata(dev); +} +#endif + +static const struct of_device_id s3c64xx_spi_dt_match[]; + +static inline struct s3c64xx_spi_port_config *s3c64xx_spi_get_port_config( + struct platform_device *pdev) +{ +#ifdef CONFIG_OF + if (pdev->dev.of_node) { + const struct of_device_id *match; + match = of_match_node(s3c64xx_spi_dt_match, pdev->dev.of_node); + return (struct s3c64xx_spi_port_config *)match->data; + } +#endif + return (struct s3c64xx_spi_port_config *) + platform_get_device_id(pdev)->driver_data; +} + +static int s3c64xx_spi_probe(struct platform_device *pdev) +{ + struct resource *mem_res; + struct s3c64xx_spi_driver_data *sdd; + struct s3c64xx_spi_info *sci = dev_get_platdata(&pdev->dev); + struct spi_master *master; + int ret, irq; + char clk_name[16]; + + if (!sci && pdev->dev.of_node) { + sci = s3c64xx_spi_parse_dt(&pdev->dev); + if (IS_ERR(sci)) + return PTR_ERR(sci); + } + + if (!sci) { + dev_err(&pdev->dev, "platform_data missing!\n"); + return -ENODEV; + } + + mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + if (mem_res == NULL) { + dev_err(&pdev->dev, "Unable to get SPI MEM resource\n"); + return -ENXIO; + } + + irq = platform_get_irq(pdev, 0); + if (irq < 0) { + dev_warn(&pdev->dev, "Failed to get IRQ: %d\n", irq); + return irq; + } + + master = spi_alloc_master(&pdev->dev, + sizeof(struct s3c64xx_spi_driver_data)); + if (master == NULL) { + dev_err(&pdev->dev, "Unable to allocate SPI Master\n"); + return -ENOMEM; + } + + platform_set_drvdata(pdev, master); + + sdd = spi_master_get_devdata(master); + sdd->port_conf = s3c64xx_spi_get_port_config(pdev); + sdd->master = master; + sdd->cntrlr_info = sci; + sdd->pdev = pdev; + sdd->sfr_start = mem_res->start; + if (pdev->dev.of_node) { + ret = of_alias_get_id(pdev->dev.of_node, "spi"); + if (ret < 0) { + dev_err(&pdev->dev, "failed to get alias id, errno %d\n", + ret); + goto err_deref_master; + } + sdd->port_id = ret; + } else { + sdd->port_id = pdev->id; + } + + sdd->cur_bpw = 8; + + sdd->tx_dma.direction = DMA_MEM_TO_DEV; + sdd->rx_dma.direction = DMA_DEV_TO_MEM; + + master->dev.of_node = pdev->dev.of_node; + master->bus_num = sdd->port_id; + master->setup = s3c64xx_spi_setup; + master->cleanup = s3c64xx_spi_cleanup; + master->prepare_transfer_hardware = s3c64xx_spi_prepare_transfer; + master->prepare_message = s3c64xx_spi_prepare_message; + master->transfer_one = s3c64xx_spi_transfer_one; + master->max_transfer_size = s3c64xx_spi_max_transfer_size; + master->num_chipselect = sci->num_cs; + master->dma_alignment = 8; + master->bits_per_word_mask = SPI_BPW_MASK(32) | SPI_BPW_MASK(16) | + SPI_BPW_MASK(8); + /* the spi->mode bits understood by this driver: */ + master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH; + master->auto_runtime_pm = true; + if (!is_polling(sdd)) + master->can_dma = s3c64xx_spi_can_dma; + + sdd->regs = devm_ioremap_resource(&pdev->dev, mem_res); + if (IS_ERR(sdd->regs)) { + ret = PTR_ERR(sdd->regs); + goto err_deref_master; + } + + if (sci->cfg_gpio && sci->cfg_gpio()) { + dev_err(&pdev->dev, "Unable to config gpio\n"); + ret = -EBUSY; + goto err_deref_master; + } + + /* Setup clocks */ + sdd->clk = devm_clk_get(&pdev->dev, "spi"); + if (IS_ERR(sdd->clk)) { + dev_err(&pdev->dev, "Unable to acquire clock 'spi'\n"); + ret = PTR_ERR(sdd->clk); + goto err_deref_master; + } + + ret = clk_prepare_enable(sdd->clk); + if (ret) { + dev_err(&pdev->dev, "Couldn't enable clock 'spi'\n"); + goto err_deref_master; + } + + sprintf(clk_name, "spi_busclk%d", sci->src_clk_nr); + sdd->src_clk = devm_clk_get(&pdev->dev, clk_name); + if (IS_ERR(sdd->src_clk)) { + dev_err(&pdev->dev, + "Unable to acquire clock '%s'\n", clk_name); + ret = PTR_ERR(sdd->src_clk); + goto err_disable_clk; + } + + ret = clk_prepare_enable(sdd->src_clk); + if (ret) { + dev_err(&pdev->dev, "Couldn't enable clock '%s'\n", clk_name); + goto err_disable_clk; + } + + if (sdd->port_conf->clk_ioclk) { + sdd->ioclk = devm_clk_get(&pdev->dev, "spi_ioclk"); + if (IS_ERR(sdd->ioclk)) { + dev_err(&pdev->dev, "Unable to acquire 'ioclk'\n"); + ret = PTR_ERR(sdd->ioclk); + goto err_disable_src_clk; + } + + ret = clk_prepare_enable(sdd->ioclk); + if (ret) { + dev_err(&pdev->dev, "Couldn't enable clock 'ioclk'\n"); + goto err_disable_src_clk; + } + } + + if (!is_polling(sdd)) { + /* Acquire DMA channels */ + sdd->rx_dma.ch = dma_request_chan(&pdev->dev, "rx"); + if (IS_ERR(sdd->rx_dma.ch)) { + dev_err(&pdev->dev, "Failed to get RX DMA channel\n"); + ret = PTR_ERR(sdd->rx_dma.ch); + goto err_disable_io_clk; + } + sdd->tx_dma.ch = dma_request_chan(&pdev->dev, "tx"); + if (IS_ERR(sdd->tx_dma.ch)) { + dev_err(&pdev->dev, "Failed to get TX DMA channel\n"); + ret = PTR_ERR(sdd->tx_dma.ch); + goto err_release_rx_dma; + } + } + + pm_runtime_set_autosuspend_delay(&pdev->dev, AUTOSUSPEND_TIMEOUT); + pm_runtime_use_autosuspend(&pdev->dev); + pm_runtime_set_active(&pdev->dev); + pm_runtime_enable(&pdev->dev); + pm_runtime_get_sync(&pdev->dev); + + /* Setup Deufult Mode */ + s3c64xx_spi_hwinit(sdd); + + spin_lock_init(&sdd->lock); + init_completion(&sdd->xfer_completion); + + ret = devm_request_irq(&pdev->dev, irq, s3c64xx_spi_irq, 0, + "spi-s3c64xx", sdd); + if (ret != 0) { + dev_err(&pdev->dev, "Failed to request IRQ %d: %d\n", + irq, ret); + goto err_pm_put; + } + + writel(S3C64XX_SPI_INT_RX_OVERRUN_EN | S3C64XX_SPI_INT_RX_UNDERRUN_EN | + S3C64XX_SPI_INT_TX_OVERRUN_EN | S3C64XX_SPI_INT_TX_UNDERRUN_EN, + sdd->regs + S3C64XX_SPI_INT_EN); + + ret = devm_spi_register_master(&pdev->dev, master); + if (ret != 0) { + dev_err(&pdev->dev, "cannot register SPI master: %d\n", ret); + goto err_pm_put; + } + + dev_dbg(&pdev->dev, "Samsung SoC SPI Driver loaded for Bus SPI-%d with %d Slaves attached\n", + sdd->port_id, master->num_chipselect); + dev_dbg(&pdev->dev, "\tIOmem=[%pR]\tFIFO %dbytes\n", + mem_res, (FIFO_LVL_MASK(sdd) >> 1) + 1); + + pm_runtime_mark_last_busy(&pdev->dev); + pm_runtime_put_autosuspend(&pdev->dev); + + return 0; + +err_pm_put: + pm_runtime_put_noidle(&pdev->dev); + pm_runtime_disable(&pdev->dev); + pm_runtime_set_suspended(&pdev->dev); + + if (!is_polling(sdd)) + dma_release_channel(sdd->tx_dma.ch); +err_release_rx_dma: + if (!is_polling(sdd)) + dma_release_channel(sdd->rx_dma.ch); +err_disable_io_clk: + clk_disable_unprepare(sdd->ioclk); +err_disable_src_clk: + clk_disable_unprepare(sdd->src_clk); +err_disable_clk: + clk_disable_unprepare(sdd->clk); +err_deref_master: + spi_master_put(master); + + return ret; +} + +static int s3c64xx_spi_remove(struct platform_device *pdev) +{ + struct spi_master *master = platform_get_drvdata(pdev); + struct s3c64xx_spi_driver_data *sdd = spi_master_get_devdata(master); + + pm_runtime_get_sync(&pdev->dev); + + writel(0, sdd->regs + S3C64XX_SPI_INT_EN); + + if (!is_polling(sdd)) { + dma_release_channel(sdd->rx_dma.ch); + dma_release_channel(sdd->tx_dma.ch); + } + + clk_disable_unprepare(sdd->ioclk); + + clk_disable_unprepare(sdd->src_clk); + + clk_disable_unprepare(sdd->clk); + + pm_runtime_put_noidle(&pdev->dev); + pm_runtime_disable(&pdev->dev); + pm_runtime_set_suspended(&pdev->dev); + + return 0; +} + +#ifdef CONFIG_PM_SLEEP +static int s3c64xx_spi_suspend(struct device *dev) +{ + struct spi_master *master = dev_get_drvdata(dev); + struct s3c64xx_spi_driver_data *sdd = spi_master_get_devdata(master); + + int ret = spi_master_suspend(master); + if (ret) + return ret; + + ret = pm_runtime_force_suspend(dev); + if (ret < 0) + return ret; + + sdd->cur_speed = 0; /* Output Clock is stopped */ + + return 0; +} + +static int s3c64xx_spi_resume(struct device *dev) +{ + struct spi_master *master = dev_get_drvdata(dev); + struct s3c64xx_spi_driver_data *sdd = spi_master_get_devdata(master); + struct s3c64xx_spi_info *sci = sdd->cntrlr_info; + int ret; + + if (sci->cfg_gpio) + sci->cfg_gpio(); + + ret = pm_runtime_force_resume(dev); + if (ret < 0) + return ret; + + return spi_master_resume(master); +} +#endif /* CONFIG_PM_SLEEP */ + +#ifdef CONFIG_PM +static int s3c64xx_spi_runtime_suspend(struct device *dev) +{ + struct spi_master *master = dev_get_drvdata(dev); + struct s3c64xx_spi_driver_data *sdd = spi_master_get_devdata(master); + + clk_disable_unprepare(sdd->clk); + clk_disable_unprepare(sdd->src_clk); + clk_disable_unprepare(sdd->ioclk); + + return 0; +} + +static int s3c64xx_spi_runtime_resume(struct device *dev) +{ + struct spi_master *master = dev_get_drvdata(dev); + struct s3c64xx_spi_driver_data *sdd = spi_master_get_devdata(master); + int ret; + + if (sdd->port_conf->clk_ioclk) { + ret = clk_prepare_enable(sdd->ioclk); + if (ret != 0) + return ret; + } + + ret = clk_prepare_enable(sdd->src_clk); + if (ret != 0) + goto err_disable_ioclk; + + ret = clk_prepare_enable(sdd->clk); + if (ret != 0) + goto err_disable_src_clk; + + s3c64xx_spi_hwinit(sdd); + + writel(S3C64XX_SPI_INT_RX_OVERRUN_EN | S3C64XX_SPI_INT_RX_UNDERRUN_EN | + S3C64XX_SPI_INT_TX_OVERRUN_EN | S3C64XX_SPI_INT_TX_UNDERRUN_EN, + sdd->regs + S3C64XX_SPI_INT_EN); + + return 0; + +err_disable_src_clk: + clk_disable_unprepare(sdd->src_clk); +err_disable_ioclk: + clk_disable_unprepare(sdd->ioclk); + + return ret; +} +#endif /* CONFIG_PM */ + +static const struct dev_pm_ops s3c64xx_spi_pm = { + SET_SYSTEM_SLEEP_PM_OPS(s3c64xx_spi_suspend, s3c64xx_spi_resume) + SET_RUNTIME_PM_OPS(s3c64xx_spi_runtime_suspend, + s3c64xx_spi_runtime_resume, NULL) +}; + +static struct s3c64xx_spi_port_config s3c2443_spi_port_config = { + .fifo_lvl_mask = { 0x7f }, + .rx_lvl_offset = 13, + .tx_st_done = 21, + .high_speed = true, +}; + +static struct s3c64xx_spi_port_config s3c6410_spi_port_config = { + .fifo_lvl_mask = { 0x7f, 0x7F }, + .rx_lvl_offset = 13, + .tx_st_done = 21, +}; + +static struct s3c64xx_spi_port_config s5pv210_spi_port_config = { + .fifo_lvl_mask = { 0x1ff, 0x7F }, + .rx_lvl_offset = 15, + .tx_st_done = 25, + .high_speed = true, +}; + +static struct s3c64xx_spi_port_config exynos4_spi_port_config = { + .fifo_lvl_mask = { 0x1ff, 0x7F, 0x7F }, + .rx_lvl_offset = 15, + .tx_st_done = 25, + .high_speed = true, + .clk_from_cmu = true, + .quirks = S3C64XX_SPI_QUIRK_CS_AUTO, +}; + +static struct s3c64xx_spi_port_config exynos7_spi_port_config = { + .fifo_lvl_mask = { 0x1ff, 0x7F, 0x7F, 0x7F, 0x7F, 0x1ff}, + .rx_lvl_offset = 15, + .tx_st_done = 25, + .high_speed = true, + .clk_from_cmu = true, + .quirks = S3C64XX_SPI_QUIRK_CS_AUTO, +}; + +static struct s3c64xx_spi_port_config exynos5433_spi_port_config = { + .fifo_lvl_mask = { 0x1ff, 0x7f, 0x7f, 0x7f, 0x7f, 0x1ff}, + .rx_lvl_offset = 15, + .tx_st_done = 25, + .high_speed = true, + .clk_from_cmu = true, + .clk_ioclk = true, + .quirks = S3C64XX_SPI_QUIRK_CS_AUTO, +}; + +static const struct platform_device_id s3c64xx_spi_driver_ids[] = { + { + .name = "s3c2443-spi", + .driver_data = (kernel_ulong_t)&s3c2443_spi_port_config, + }, { + .name = "s3c6410-spi", + .driver_data = (kernel_ulong_t)&s3c6410_spi_port_config, + }, + { }, +}; + +static const struct of_device_id s3c64xx_spi_dt_match[] = { + { .compatible = "samsung,s3c2443-spi", + .data = (void *)&s3c2443_spi_port_config, + }, + { .compatible = "samsung,s3c6410-spi", + .data = (void *)&s3c6410_spi_port_config, + }, + { .compatible = "samsung,s5pv210-spi", + .data = (void *)&s5pv210_spi_port_config, + }, + { .compatible = "samsung,exynos4210-spi", + .data = (void *)&exynos4_spi_port_config, + }, + { .compatible = "samsung,exynos7-spi", + .data = (void *)&exynos7_spi_port_config, + }, + { .compatible = "samsung,exynos5433-spi", + .data = (void *)&exynos5433_spi_port_config, + }, + { }, +}; +MODULE_DEVICE_TABLE(of, s3c64xx_spi_dt_match); + +static struct platform_driver s3c64xx_spi_driver = { + .driver = { + .name = "s3c64xx-spi", + .pm = &s3c64xx_spi_pm, + .of_match_table = of_match_ptr(s3c64xx_spi_dt_match), + }, + .probe = s3c64xx_spi_probe, + .remove = s3c64xx_spi_remove, + .id_table = s3c64xx_spi_driver_ids, +}; +MODULE_ALIAS("platform:s3c64xx-spi"); + +module_platform_driver(s3c64xx_spi_driver); + +MODULE_AUTHOR("Jaswinder Singh <jassi.brar@samsung.com>"); +MODULE_DESCRIPTION("S3C64XX SPI Controller Driver"); +MODULE_LICENSE("GPL"); diff --git a/drivers/spi/spi-sc18is602.c b/drivers/spi/spi-sc18is602.c new file mode 100644 index 000000000..297c51206 --- /dev/null +++ b/drivers/spi/spi-sc18is602.c @@ -0,0 +1,341 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * NXP SC18IS602/603 SPI driver + * + * Copyright (C) Guenter Roeck <linux@roeck-us.net> + */ + +#include <linux/kernel.h> +#include <linux/err.h> +#include <linux/module.h> +#include <linux/spi/spi.h> +#include <linux/i2c.h> +#include <linux/delay.h> +#include <linux/pm_runtime.h> +#include <linux/of_device.h> +#include <linux/of.h> +#include <linux/platform_data/sc18is602.h> +#include <linux/gpio/consumer.h> + +enum chips { sc18is602, sc18is602b, sc18is603 }; + +#define SC18IS602_BUFSIZ 200 +#define SC18IS602_CLOCK 7372000 + +#define SC18IS602_MODE_CPHA BIT(2) +#define SC18IS602_MODE_CPOL BIT(3) +#define SC18IS602_MODE_LSB_FIRST BIT(5) +#define SC18IS602_MODE_CLOCK_DIV_4 0x0 +#define SC18IS602_MODE_CLOCK_DIV_16 0x1 +#define SC18IS602_MODE_CLOCK_DIV_64 0x2 +#define SC18IS602_MODE_CLOCK_DIV_128 0x3 + +struct sc18is602 { + struct spi_master *master; + struct device *dev; + u8 ctrl; + u32 freq; + u32 speed; + + /* I2C data */ + struct i2c_client *client; + enum chips id; + u8 buffer[SC18IS602_BUFSIZ + 1]; + int tlen; /* Data queued for tx in buffer */ + int rindex; /* Receive data index in buffer */ + + struct gpio_desc *reset; +}; + +static int sc18is602_wait_ready(struct sc18is602 *hw, int len) +{ + int i, err; + int usecs = 1000000 * len / hw->speed + 1; + u8 dummy[1]; + + for (i = 0; i < 10; i++) { + err = i2c_master_recv(hw->client, dummy, 1); + if (err >= 0) + return 0; + usleep_range(usecs, usecs * 2); + } + return -ETIMEDOUT; +} + +static int sc18is602_txrx(struct sc18is602 *hw, struct spi_message *msg, + struct spi_transfer *t, bool do_transfer) +{ + unsigned int len = t->len; + int ret; + + if (hw->tlen == 0) { + /* First byte (I2C command) is chip select */ + hw->buffer[0] = 1 << msg->spi->chip_select; + hw->tlen = 1; + hw->rindex = 0; + } + /* + * We can not immediately send data to the chip, since each I2C message + * resembles a full SPI message (from CS active to CS inactive). + * Enqueue messages up to the first read or until do_transfer is true. + */ + if (t->tx_buf) { + memcpy(&hw->buffer[hw->tlen], t->tx_buf, len); + hw->tlen += len; + if (t->rx_buf) + do_transfer = true; + else + hw->rindex = hw->tlen - 1; + } else if (t->rx_buf) { + /* + * For receive-only transfers we still need to perform a dummy + * write to receive data from the SPI chip. + * Read data starts at the end of transmit data (minus 1 to + * account for CS). + */ + hw->rindex = hw->tlen - 1; + memset(&hw->buffer[hw->tlen], 0, len); + hw->tlen += len; + do_transfer = true; + } + + if (do_transfer && hw->tlen > 1) { + ret = sc18is602_wait_ready(hw, SC18IS602_BUFSIZ); + if (ret < 0) + return ret; + ret = i2c_master_send(hw->client, hw->buffer, hw->tlen); + if (ret < 0) + return ret; + if (ret != hw->tlen) + return -EIO; + + if (t->rx_buf) { + int rlen = hw->rindex + len; + + ret = sc18is602_wait_ready(hw, hw->tlen); + if (ret < 0) + return ret; + ret = i2c_master_recv(hw->client, hw->buffer, rlen); + if (ret < 0) + return ret; + if (ret != rlen) + return -EIO; + memcpy(t->rx_buf, &hw->buffer[hw->rindex], len); + } + hw->tlen = 0; + } + return len; +} + +static int sc18is602_setup_transfer(struct sc18is602 *hw, u32 hz, u8 mode) +{ + u8 ctrl = 0; + int ret; + + if (mode & SPI_CPHA) + ctrl |= SC18IS602_MODE_CPHA; + if (mode & SPI_CPOL) + ctrl |= SC18IS602_MODE_CPOL; + if (mode & SPI_LSB_FIRST) + ctrl |= SC18IS602_MODE_LSB_FIRST; + + /* Find the closest clock speed */ + if (hz >= hw->freq / 4) { + ctrl |= SC18IS602_MODE_CLOCK_DIV_4; + hw->speed = hw->freq / 4; + } else if (hz >= hw->freq / 16) { + ctrl |= SC18IS602_MODE_CLOCK_DIV_16; + hw->speed = hw->freq / 16; + } else if (hz >= hw->freq / 64) { + ctrl |= SC18IS602_MODE_CLOCK_DIV_64; + hw->speed = hw->freq / 64; + } else { + ctrl |= SC18IS602_MODE_CLOCK_DIV_128; + hw->speed = hw->freq / 128; + } + + /* + * Don't do anything if the control value did not change. The initial + * value of 0xff for hw->ctrl ensures that the correct mode will be set + * with the first call to this function. + */ + if (ctrl == hw->ctrl) + return 0; + + ret = i2c_smbus_write_byte_data(hw->client, 0xf0, ctrl); + if (ret < 0) + return ret; + + hw->ctrl = ctrl; + + return 0; +} + +static int sc18is602_check_transfer(struct spi_device *spi, + struct spi_transfer *t, int tlen) +{ + if (t && t->len + tlen > SC18IS602_BUFSIZ) + return -EINVAL; + + return 0; +} + +static int sc18is602_transfer_one(struct spi_master *master, + struct spi_message *m) +{ + struct sc18is602 *hw = spi_master_get_devdata(master); + struct spi_device *spi = m->spi; + struct spi_transfer *t; + int status = 0; + + hw->tlen = 0; + list_for_each_entry(t, &m->transfers, transfer_list) { + bool do_transfer; + + status = sc18is602_check_transfer(spi, t, hw->tlen); + if (status < 0) + break; + + status = sc18is602_setup_transfer(hw, t->speed_hz, spi->mode); + if (status < 0) + break; + + do_transfer = t->cs_change || list_is_last(&t->transfer_list, + &m->transfers); + + if (t->len) { + status = sc18is602_txrx(hw, m, t, do_transfer); + if (status < 0) + break; + m->actual_length += status; + } + status = 0; + + spi_transfer_delay_exec(t); + } + m->status = status; + spi_finalize_current_message(master); + + return status; +} + +static int sc18is602_setup(struct spi_device *spi) +{ + struct sc18is602 *hw = spi_master_get_devdata(spi->master); + + /* SC18IS602 does not support CS2 */ + if (hw->id == sc18is602 && spi->chip_select == 2) + return -ENXIO; + + return 0; +} + +static int sc18is602_probe(struct i2c_client *client, + const struct i2c_device_id *id) +{ + struct device *dev = &client->dev; + struct device_node *np = dev->of_node; + struct sc18is602_platform_data *pdata = dev_get_platdata(dev); + struct sc18is602 *hw; + struct spi_master *master; + + if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C | + I2C_FUNC_SMBUS_WRITE_BYTE_DATA)) + return -EINVAL; + + master = devm_spi_alloc_master(dev, sizeof(struct sc18is602)); + if (!master) + return -ENOMEM; + + hw = spi_master_get_devdata(master); + i2c_set_clientdata(client, hw); + + /* assert reset and then release */ + hw->reset = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_HIGH); + if (IS_ERR(hw->reset)) + return PTR_ERR(hw->reset); + gpiod_set_value_cansleep(hw->reset, 0); + + hw->master = master; + hw->client = client; + hw->dev = dev; + hw->ctrl = 0xff; + + if (client->dev.of_node) + hw->id = (enum chips)of_device_get_match_data(&client->dev); + else + hw->id = id->driver_data; + + switch (hw->id) { + case sc18is602: + case sc18is602b: + master->num_chipselect = 4; + hw->freq = SC18IS602_CLOCK; + break; + case sc18is603: + master->num_chipselect = 2; + if (pdata) { + hw->freq = pdata->clock_frequency; + } else { + const __be32 *val; + int len; + + val = of_get_property(np, "clock-frequency", &len); + if (val && len >= sizeof(__be32)) + hw->freq = be32_to_cpup(val); + } + if (!hw->freq) + hw->freq = SC18IS602_CLOCK; + break; + } + master->bus_num = np ? -1 : client->adapter->nr; + master->mode_bits = SPI_CPHA | SPI_CPOL | SPI_LSB_FIRST; + master->bits_per_word_mask = SPI_BPW_MASK(8); + master->setup = sc18is602_setup; + master->transfer_one_message = sc18is602_transfer_one; + master->dev.of_node = np; + master->min_speed_hz = hw->freq / 128; + master->max_speed_hz = hw->freq / 4; + + return devm_spi_register_master(dev, master); +} + +static const struct i2c_device_id sc18is602_id[] = { + { "sc18is602", sc18is602 }, + { "sc18is602b", sc18is602b }, + { "sc18is603", sc18is603 }, + { } +}; +MODULE_DEVICE_TABLE(i2c, sc18is602_id); + +static const struct of_device_id sc18is602_of_match[] = { + { + .compatible = "nxp,sc18is602", + .data = (void *)sc18is602 + }, + { + .compatible = "nxp,sc18is602b", + .data = (void *)sc18is602b + }, + { + .compatible = "nxp,sc18is603", + .data = (void *)sc18is603 + }, + { }, +}; +MODULE_DEVICE_TABLE(of, sc18is602_of_match); + +static struct i2c_driver sc18is602_driver = { + .driver = { + .name = "sc18is602", + .of_match_table = of_match_ptr(sc18is602_of_match), + }, + .probe = sc18is602_probe, + .id_table = sc18is602_id, +}; + +module_i2c_driver(sc18is602_driver); + +MODULE_DESCRIPTION("SC18IS602/603 SPI Master Driver"); +MODULE_AUTHOR("Guenter Roeck"); +MODULE_LICENSE("GPL"); diff --git a/drivers/spi/spi-sh-hspi.c b/drivers/spi/spi-sh-hspi.c new file mode 100644 index 000000000..a62034e2a --- /dev/null +++ b/drivers/spi/spi-sh-hspi.c @@ -0,0 +1,309 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * SuperH HSPI bus driver + * + * Copyright (C) 2011 Kuninori Morimoto + * + * Based on spi-sh.c: + * Based on pxa2xx_spi.c: + * Copyright (C) 2011 Renesas Solutions Corp. + * Copyright (C) 2005 Stephen Street / StreetFire Sound Labs + */ + +#include <linux/clk.h> +#include <linux/module.h> +#include <linux/kernel.h> +#include <linux/timer.h> +#include <linux/delay.h> +#include <linux/list.h> +#include <linux/interrupt.h> +#include <linux/platform_device.h> +#include <linux/pm_runtime.h> +#include <linux/io.h> +#include <linux/spi/spi.h> +#include <linux/spi/sh_hspi.h> + +#define SPCR 0x00 +#define SPSR 0x04 +#define SPSCR 0x08 +#define SPTBR 0x0C +#define SPRBR 0x10 +#define SPCR2 0x14 + +/* SPSR */ +#define RXFL (1 << 2) + +struct hspi_priv { + void __iomem *addr; + struct spi_controller *ctlr; + struct device *dev; + struct clk *clk; +}; + +/* + * basic function + */ +static void hspi_write(struct hspi_priv *hspi, int reg, u32 val) +{ + iowrite32(val, hspi->addr + reg); +} + +static u32 hspi_read(struct hspi_priv *hspi, int reg) +{ + return ioread32(hspi->addr + reg); +} + +static void hspi_bit_set(struct hspi_priv *hspi, int reg, u32 mask, u32 set) +{ + u32 val = hspi_read(hspi, reg); + + val &= ~mask; + val |= set & mask; + + hspi_write(hspi, reg, val); +} + +/* + * transfer function + */ +static int hspi_status_check_timeout(struct hspi_priv *hspi, u32 mask, u32 val) +{ + int t = 256; + + while (t--) { + if ((mask & hspi_read(hspi, SPSR)) == val) + return 0; + + udelay(10); + } + + dev_err(hspi->dev, "timeout\n"); + return -ETIMEDOUT; +} + +/* + * spi master function + */ + +#define hspi_hw_cs_enable(hspi) hspi_hw_cs_ctrl(hspi, 0) +#define hspi_hw_cs_disable(hspi) hspi_hw_cs_ctrl(hspi, 1) +static void hspi_hw_cs_ctrl(struct hspi_priv *hspi, int hi) +{ + hspi_bit_set(hspi, SPSCR, (1 << 6), (hi) << 6); +} + +static void hspi_hw_setup(struct hspi_priv *hspi, + struct spi_message *msg, + struct spi_transfer *t) +{ + struct spi_device *spi = msg->spi; + struct device *dev = hspi->dev; + u32 spcr, idiv_clk; + u32 rate, best_rate, min, tmp; + + /* + * find best IDIV/CLKCx settings + */ + min = ~0; + best_rate = 0; + spcr = 0; + for (idiv_clk = 0x00; idiv_clk <= 0x3F; idiv_clk++) { + rate = clk_get_rate(hspi->clk); + + /* IDIV calculation */ + if (idiv_clk & (1 << 5)) + rate /= 128; + else + rate /= 16; + + /* CLKCx calculation */ + rate /= (((idiv_clk & 0x1F) + 1) * 2); + + /* save best settings */ + tmp = abs(t->speed_hz - rate); + if (tmp < min) { + min = tmp; + spcr = idiv_clk; + best_rate = rate; + } + } + + if (spi->mode & SPI_CPHA) + spcr |= 1 << 7; + if (spi->mode & SPI_CPOL) + spcr |= 1 << 6; + + dev_dbg(dev, "speed %d/%d\n", t->speed_hz, best_rate); + + hspi_write(hspi, SPCR, spcr); + hspi_write(hspi, SPSR, 0x0); + hspi_write(hspi, SPSCR, 0x21); /* master mode / CS control */ +} + +static int hspi_transfer_one_message(struct spi_controller *ctlr, + struct spi_message *msg) +{ + struct hspi_priv *hspi = spi_controller_get_devdata(ctlr); + struct spi_transfer *t; + u32 tx; + u32 rx; + int ret, i; + unsigned int cs_change; + const int nsecs = 50; + + dev_dbg(hspi->dev, "%s\n", __func__); + + cs_change = 1; + ret = 0; + list_for_each_entry(t, &msg->transfers, transfer_list) { + + if (cs_change) { + hspi_hw_setup(hspi, msg, t); + hspi_hw_cs_enable(hspi); + ndelay(nsecs); + } + cs_change = t->cs_change; + + for (i = 0; i < t->len; i++) { + + /* wait remains */ + ret = hspi_status_check_timeout(hspi, 0x1, 0); + if (ret < 0) + break; + + tx = 0; + if (t->tx_buf) + tx = (u32)((u8 *)t->tx_buf)[i]; + + hspi_write(hspi, SPTBR, tx); + + /* wait receive */ + ret = hspi_status_check_timeout(hspi, 0x4, 0x4); + if (ret < 0) + break; + + rx = hspi_read(hspi, SPRBR); + if (t->rx_buf) + ((u8 *)t->rx_buf)[i] = (u8)rx; + + } + + msg->actual_length += t->len; + + spi_transfer_delay_exec(t); + + if (cs_change) { + ndelay(nsecs); + hspi_hw_cs_disable(hspi); + ndelay(nsecs); + } + } + + msg->status = ret; + if (!cs_change) { + ndelay(nsecs); + hspi_hw_cs_disable(hspi); + } + spi_finalize_current_message(ctlr); + + return ret; +} + +static int hspi_probe(struct platform_device *pdev) +{ + struct resource *res; + struct spi_controller *ctlr; + struct hspi_priv *hspi; + struct clk *clk; + int ret; + + /* get base addr */ + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + if (!res) { + dev_err(&pdev->dev, "invalid resource\n"); + return -EINVAL; + } + + ctlr = spi_alloc_master(&pdev->dev, sizeof(*hspi)); + if (!ctlr) + return -ENOMEM; + + clk = clk_get(&pdev->dev, NULL); + if (IS_ERR(clk)) { + dev_err(&pdev->dev, "couldn't get clock\n"); + ret = -EINVAL; + goto error0; + } + + hspi = spi_controller_get_devdata(ctlr); + platform_set_drvdata(pdev, hspi); + + /* init hspi */ + hspi->ctlr = ctlr; + hspi->dev = &pdev->dev; + hspi->clk = clk; + hspi->addr = devm_ioremap(hspi->dev, + res->start, resource_size(res)); + if (!hspi->addr) { + ret = -ENOMEM; + goto error1; + } + + pm_runtime_enable(&pdev->dev); + + ctlr->bus_num = pdev->id; + ctlr->mode_bits = SPI_CPOL | SPI_CPHA; + ctlr->dev.of_node = pdev->dev.of_node; + ctlr->auto_runtime_pm = true; + ctlr->transfer_one_message = hspi_transfer_one_message; + ctlr->bits_per_word_mask = SPI_BPW_MASK(8); + + ret = devm_spi_register_controller(&pdev->dev, ctlr); + if (ret < 0) { + dev_err(&pdev->dev, "devm_spi_register_controller error.\n"); + goto error2; + } + + return 0; + + error2: + pm_runtime_disable(&pdev->dev); + error1: + clk_put(clk); + error0: + spi_controller_put(ctlr); + + return ret; +} + +static int hspi_remove(struct platform_device *pdev) +{ + struct hspi_priv *hspi = platform_get_drvdata(pdev); + + pm_runtime_disable(&pdev->dev); + + clk_put(hspi->clk); + + return 0; +} + +static const struct of_device_id hspi_of_match[] = { + { .compatible = "renesas,hspi", }, + { /* sentinel */ } +}; +MODULE_DEVICE_TABLE(of, hspi_of_match); + +static struct platform_driver hspi_driver = { + .probe = hspi_probe, + .remove = hspi_remove, + .driver = { + .name = "sh-hspi", + .of_match_table = hspi_of_match, + }, +}; +module_platform_driver(hspi_driver); + +MODULE_DESCRIPTION("SuperH HSPI bus driver"); +MODULE_LICENSE("GPL v2"); +MODULE_AUTHOR("Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>"); +MODULE_ALIAS("platform:sh-hspi"); diff --git a/drivers/spi/spi-sh-msiof.c b/drivers/spi/spi-sh-msiof.c new file mode 100644 index 000000000..35d303782 --- /dev/null +++ b/drivers/spi/spi-sh-msiof.c @@ -0,0 +1,1438 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * SuperH MSIOF SPI Controller Interface + * + * Copyright (c) 2009 Magnus Damm + * Copyright (C) 2014 Renesas Electronics Corporation + * Copyright (C) 2014-2017 Glider bvba + */ + +#include <linux/bitmap.h> +#include <linux/clk.h> +#include <linux/completion.h> +#include <linux/delay.h> +#include <linux/dma-mapping.h> +#include <linux/dmaengine.h> +#include <linux/err.h> +#include <linux/interrupt.h> +#include <linux/io.h> +#include <linux/iopoll.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/of.h> +#include <linux/of_device.h> +#include <linux/platform_device.h> +#include <linux/pm_runtime.h> +#include <linux/sh_dma.h> + +#include <linux/spi/sh_msiof.h> +#include <linux/spi/spi.h> + +#include <asm/unaligned.h> + +#define SH_MSIOF_FLAG_FIXED_DTDL_200 BIT(0) + +struct sh_msiof_chipdata { + u32 bits_per_word_mask; + u16 tx_fifo_size; + u16 rx_fifo_size; + u16 ctlr_flags; + u16 min_div_pow; + u32 flags; +}; + +struct sh_msiof_spi_priv { + struct spi_controller *ctlr; + void __iomem *mapbase; + struct clk *clk; + struct platform_device *pdev; + struct sh_msiof_spi_info *info; + struct completion done; + struct completion done_txdma; + unsigned int tx_fifo_size; + unsigned int rx_fifo_size; + unsigned int min_div_pow; + void *tx_dma_page; + void *rx_dma_page; + dma_addr_t tx_dma_addr; + dma_addr_t rx_dma_addr; + bool native_cs_inited; + bool native_cs_high; + bool slave_aborted; +}; + +#define MAX_SS 3 /* Maximum number of native chip selects */ + +#define SITMDR1 0x00 /* Transmit Mode Register 1 */ +#define SITMDR2 0x04 /* Transmit Mode Register 2 */ +#define SITMDR3 0x08 /* Transmit Mode Register 3 */ +#define SIRMDR1 0x10 /* Receive Mode Register 1 */ +#define SIRMDR2 0x14 /* Receive Mode Register 2 */ +#define SIRMDR3 0x18 /* Receive Mode Register 3 */ +#define SITSCR 0x20 /* Transmit Clock Select Register */ +#define SIRSCR 0x22 /* Receive Clock Select Register (SH, A1, APE6) */ +#define SICTR 0x28 /* Control Register */ +#define SIFCTR 0x30 /* FIFO Control Register */ +#define SISTR 0x40 /* Status Register */ +#define SIIER 0x44 /* Interrupt Enable Register */ +#define SITDR1 0x48 /* Transmit Control Data Register 1 (SH, A1) */ +#define SITDR2 0x4c /* Transmit Control Data Register 2 (SH, A1) */ +#define SITFDR 0x50 /* Transmit FIFO Data Register */ +#define SIRDR1 0x58 /* Receive Control Data Register 1 (SH, A1) */ +#define SIRDR2 0x5c /* Receive Control Data Register 2 (SH, A1) */ +#define SIRFDR 0x60 /* Receive FIFO Data Register */ + +/* SITMDR1 and SIRMDR1 */ +#define SIMDR1_TRMD BIT(31) /* Transfer Mode (1 = Master mode) */ +#define SIMDR1_SYNCMD_MASK GENMASK(29, 28) /* SYNC Mode */ +#define SIMDR1_SYNCMD_SPI (2 << 28) /* Level mode/SPI */ +#define SIMDR1_SYNCMD_LR (3 << 28) /* L/R mode */ +#define SIMDR1_SYNCAC_SHIFT 25 /* Sync Polarity (1 = Active-low) */ +#define SIMDR1_BITLSB_SHIFT 24 /* MSB/LSB First (1 = LSB first) */ +#define SIMDR1_DTDL_SHIFT 20 /* Data Pin Bit Delay for MSIOF_SYNC */ +#define SIMDR1_SYNCDL_SHIFT 16 /* Frame Sync Signal Timing Delay */ +#define SIMDR1_FLD_MASK GENMASK(3, 2) /* Frame Sync Signal Interval (0-3) */ +#define SIMDR1_FLD_SHIFT 2 +#define SIMDR1_XXSTP BIT(0) /* Transmission/Reception Stop on FIFO */ +/* SITMDR1 */ +#define SITMDR1_PCON BIT(30) /* Transfer Signal Connection */ +#define SITMDR1_SYNCCH_MASK GENMASK(27, 26) /* Sync Signal Channel Select */ +#define SITMDR1_SYNCCH_SHIFT 26 /* 0=MSIOF_SYNC, 1=MSIOF_SS1, 2=MSIOF_SS2 */ + +/* SITMDR2 and SIRMDR2 */ +#define SIMDR2_BITLEN1(i) (((i) - 1) << 24) /* Data Size (8-32 bits) */ +#define SIMDR2_WDLEN1(i) (((i) - 1) << 16) /* Word Count (1-64/256 (SH, A1))) */ +#define SIMDR2_GRPMASK1 BIT(0) /* Group Output Mask 1 (SH, A1) */ + +/* SITSCR and SIRSCR */ +#define SISCR_BRPS_MASK GENMASK(12, 8) /* Prescaler Setting (1-32) */ +#define SISCR_BRPS(i) (((i) - 1) << 8) +#define SISCR_BRDV_MASK GENMASK(2, 0) /* Baud Rate Generator's Division Ratio */ +#define SISCR_BRDV_DIV_2 0 +#define SISCR_BRDV_DIV_4 1 +#define SISCR_BRDV_DIV_8 2 +#define SISCR_BRDV_DIV_16 3 +#define SISCR_BRDV_DIV_32 4 +#define SISCR_BRDV_DIV_1 7 + +/* SICTR */ +#define SICTR_TSCKIZ_MASK GENMASK(31, 30) /* Transmit Clock I/O Polarity Select */ +#define SICTR_TSCKIZ_SCK BIT(31) /* Disable SCK when TX disabled */ +#define SICTR_TSCKIZ_POL_SHIFT 30 /* Transmit Clock Polarity */ +#define SICTR_RSCKIZ_MASK GENMASK(29, 28) /* Receive Clock Polarity Select */ +#define SICTR_RSCKIZ_SCK BIT(29) /* Must match CTR_TSCKIZ_SCK */ +#define SICTR_RSCKIZ_POL_SHIFT 28 /* Receive Clock Polarity */ +#define SICTR_TEDG_SHIFT 27 /* Transmit Timing (1 = falling edge) */ +#define SICTR_REDG_SHIFT 26 /* Receive Timing (1 = falling edge) */ +#define SICTR_TXDIZ_MASK GENMASK(23, 22) /* Pin Output When TX is Disabled */ +#define SICTR_TXDIZ_LOW (0 << 22) /* 0 */ +#define SICTR_TXDIZ_HIGH (1 << 22) /* 1 */ +#define SICTR_TXDIZ_HIZ (2 << 22) /* High-impedance */ +#define SICTR_TSCKE BIT(15) /* Transmit Serial Clock Output Enable */ +#define SICTR_TFSE BIT(14) /* Transmit Frame Sync Signal Output Enable */ +#define SICTR_TXE BIT(9) /* Transmit Enable */ +#define SICTR_RXE BIT(8) /* Receive Enable */ +#define SICTR_TXRST BIT(1) /* Transmit Reset */ +#define SICTR_RXRST BIT(0) /* Receive Reset */ + +/* SIFCTR */ +#define SIFCTR_TFWM_MASK GENMASK(31, 29) /* Transmit FIFO Watermark */ +#define SIFCTR_TFWM_64 (0 << 29) /* Transfer Request when 64 empty stages */ +#define SIFCTR_TFWM_32 (1 << 29) /* Transfer Request when 32 empty stages */ +#define SIFCTR_TFWM_24 (2 << 29) /* Transfer Request when 24 empty stages */ +#define SIFCTR_TFWM_16 (3 << 29) /* Transfer Request when 16 empty stages */ +#define SIFCTR_TFWM_12 (4 << 29) /* Transfer Request when 12 empty stages */ +#define SIFCTR_TFWM_8 (5 << 29) /* Transfer Request when 8 empty stages */ +#define SIFCTR_TFWM_4 (6 << 29) /* Transfer Request when 4 empty stages */ +#define SIFCTR_TFWM_1 (7 << 29) /* Transfer Request when 1 empty stage */ +#define SIFCTR_TFUA_MASK GENMASK(26, 20) /* Transmit FIFO Usable Area */ +#define SIFCTR_TFUA_SHIFT 20 +#define SIFCTR_TFUA(i) ((i) << SIFCTR_TFUA_SHIFT) +#define SIFCTR_RFWM_MASK GENMASK(15, 13) /* Receive FIFO Watermark */ +#define SIFCTR_RFWM_1 (0 << 13) /* Transfer Request when 1 valid stages */ +#define SIFCTR_RFWM_4 (1 << 13) /* Transfer Request when 4 valid stages */ +#define SIFCTR_RFWM_8 (2 << 13) /* Transfer Request when 8 valid stages */ +#define SIFCTR_RFWM_16 (3 << 13) /* Transfer Request when 16 valid stages */ +#define SIFCTR_RFWM_32 (4 << 13) /* Transfer Request when 32 valid stages */ +#define SIFCTR_RFWM_64 (5 << 13) /* Transfer Request when 64 valid stages */ +#define SIFCTR_RFWM_128 (6 << 13) /* Transfer Request when 128 valid stages */ +#define SIFCTR_RFWM_256 (7 << 13) /* Transfer Request when 256 valid stages */ +#define SIFCTR_RFUA_MASK GENMASK(12, 4) /* Receive FIFO Usable Area (0x40 = full) */ +#define SIFCTR_RFUA_SHIFT 4 +#define SIFCTR_RFUA(i) ((i) << SIFCTR_RFUA_SHIFT) + +/* SISTR */ +#define SISTR_TFEMP BIT(29) /* Transmit FIFO Empty */ +#define SISTR_TDREQ BIT(28) /* Transmit Data Transfer Request */ +#define SISTR_TEOF BIT(23) /* Frame Transmission End */ +#define SISTR_TFSERR BIT(21) /* Transmit Frame Synchronization Error */ +#define SISTR_TFOVF BIT(20) /* Transmit FIFO Overflow */ +#define SISTR_TFUDF BIT(19) /* Transmit FIFO Underflow */ +#define SISTR_RFFUL BIT(13) /* Receive FIFO Full */ +#define SISTR_RDREQ BIT(12) /* Receive Data Transfer Request */ +#define SISTR_REOF BIT(7) /* Frame Reception End */ +#define SISTR_RFSERR BIT(5) /* Receive Frame Synchronization Error */ +#define SISTR_RFUDF BIT(4) /* Receive FIFO Underflow */ +#define SISTR_RFOVF BIT(3) /* Receive FIFO Overflow */ + +/* SIIER */ +#define SIIER_TDMAE BIT(31) /* Transmit Data DMA Transfer Req. Enable */ +#define SIIER_TFEMPE BIT(29) /* Transmit FIFO Empty Enable */ +#define SIIER_TDREQE BIT(28) /* Transmit Data Transfer Request Enable */ +#define SIIER_TEOFE BIT(23) /* Frame Transmission End Enable */ +#define SIIER_TFSERRE BIT(21) /* Transmit Frame Sync Error Enable */ +#define SIIER_TFOVFE BIT(20) /* Transmit FIFO Overflow Enable */ +#define SIIER_TFUDFE BIT(19) /* Transmit FIFO Underflow Enable */ +#define SIIER_RDMAE BIT(15) /* Receive Data DMA Transfer Req. Enable */ +#define SIIER_RFFULE BIT(13) /* Receive FIFO Full Enable */ +#define SIIER_RDREQE BIT(12) /* Receive Data Transfer Request Enable */ +#define SIIER_REOFE BIT(7) /* Frame Reception End Enable */ +#define SIIER_RFSERRE BIT(5) /* Receive Frame Sync Error Enable */ +#define SIIER_RFUDFE BIT(4) /* Receive FIFO Underflow Enable */ +#define SIIER_RFOVFE BIT(3) /* Receive FIFO Overflow Enable */ + + +static u32 sh_msiof_read(struct sh_msiof_spi_priv *p, int reg_offs) +{ + switch (reg_offs) { + case SITSCR: + case SIRSCR: + return ioread16(p->mapbase + reg_offs); + default: + return ioread32(p->mapbase + reg_offs); + } +} + +static void sh_msiof_write(struct sh_msiof_spi_priv *p, int reg_offs, + u32 value) +{ + switch (reg_offs) { + case SITSCR: + case SIRSCR: + iowrite16(value, p->mapbase + reg_offs); + break; + default: + iowrite32(value, p->mapbase + reg_offs); + break; + } +} + +static int sh_msiof_modify_ctr_wait(struct sh_msiof_spi_priv *p, + u32 clr, u32 set) +{ + u32 mask = clr | set; + u32 data; + + data = sh_msiof_read(p, SICTR); + data &= ~clr; + data |= set; + sh_msiof_write(p, SICTR, data); + + return readl_poll_timeout_atomic(p->mapbase + SICTR, data, + (data & mask) == set, 1, 100); +} + +static irqreturn_t sh_msiof_spi_irq(int irq, void *data) +{ + struct sh_msiof_spi_priv *p = data; + + /* just disable the interrupt and wake up */ + sh_msiof_write(p, SIIER, 0); + complete(&p->done); + + return IRQ_HANDLED; +} + +static void sh_msiof_spi_reset_regs(struct sh_msiof_spi_priv *p) +{ + u32 mask = SICTR_TXRST | SICTR_RXRST; + u32 data; + + data = sh_msiof_read(p, SICTR); + data |= mask; + sh_msiof_write(p, SICTR, data); + + readl_poll_timeout_atomic(p->mapbase + SICTR, data, !(data & mask), 1, + 100); +} + +static const u32 sh_msiof_spi_div_array[] = { + SISCR_BRDV_DIV_1, SISCR_BRDV_DIV_2, SISCR_BRDV_DIV_4, + SISCR_BRDV_DIV_8, SISCR_BRDV_DIV_16, SISCR_BRDV_DIV_32, +}; + +static void sh_msiof_spi_set_clk_regs(struct sh_msiof_spi_priv *p, + unsigned long parent_rate, u32 spi_hz) +{ + unsigned long div; + u32 brps, scr; + unsigned int div_pow = p->min_div_pow; + + if (!spi_hz || !parent_rate) { + WARN(1, "Invalid clock rate parameters %lu and %u\n", + parent_rate, spi_hz); + return; + } + + div = DIV_ROUND_UP(parent_rate, spi_hz); + if (div <= 1024) { + /* SISCR_BRDV_DIV_1 is valid only if BRPS is x 1/1 or x 1/2 */ + if (!div_pow && div <= 32 && div > 2) + div_pow = 1; + + if (div_pow) + brps = (div + 1) >> div_pow; + else + brps = div; + + for (; brps > 32; div_pow++) + brps = (brps + 1) >> 1; + } else { + /* Set transfer rate composite divisor to 2^5 * 32 = 1024 */ + dev_err(&p->pdev->dev, + "Requested SPI transfer rate %d is too low\n", spi_hz); + div_pow = 5; + brps = 32; + } + + scr = sh_msiof_spi_div_array[div_pow] | SISCR_BRPS(brps); + sh_msiof_write(p, SITSCR, scr); + if (!(p->ctlr->flags & SPI_CONTROLLER_MUST_TX)) + sh_msiof_write(p, SIRSCR, scr); +} + +static u32 sh_msiof_get_delay_bit(u32 dtdl_or_syncdl) +{ + /* + * DTDL/SYNCDL bit : p->info->dtdl or p->info->syncdl + * b'000 : 0 + * b'001 : 100 + * b'010 : 200 + * b'011 (SYNCDL only) : 300 + * b'101 : 50 + * b'110 : 150 + */ + if (dtdl_or_syncdl % 100) + return dtdl_or_syncdl / 100 + 5; + else + return dtdl_or_syncdl / 100; +} + +static u32 sh_msiof_spi_get_dtdl_and_syncdl(struct sh_msiof_spi_priv *p) +{ + u32 val; + + if (!p->info) + return 0; + + /* check if DTDL and SYNCDL is allowed value */ + if (p->info->dtdl > 200 || p->info->syncdl > 300) { + dev_warn(&p->pdev->dev, "DTDL or SYNCDL is too large\n"); + return 0; + } + + /* check if the sum of DTDL and SYNCDL becomes an integer value */ + if ((p->info->dtdl + p->info->syncdl) % 100) { + dev_warn(&p->pdev->dev, "the sum of DTDL/SYNCDL is not good\n"); + return 0; + } + + val = sh_msiof_get_delay_bit(p->info->dtdl) << SIMDR1_DTDL_SHIFT; + val |= sh_msiof_get_delay_bit(p->info->syncdl) << SIMDR1_SYNCDL_SHIFT; + + return val; +} + +static void sh_msiof_spi_set_pin_regs(struct sh_msiof_spi_priv *p, u32 ss, + u32 cpol, u32 cpha, + u32 tx_hi_z, u32 lsb_first, u32 cs_high) +{ + u32 tmp; + int edge; + + /* + * CPOL CPHA TSCKIZ RSCKIZ TEDG REDG + * 0 0 10 10 1 1 + * 0 1 10 10 0 0 + * 1 0 11 11 0 0 + * 1 1 11 11 1 1 + */ + tmp = SIMDR1_SYNCMD_SPI | 1 << SIMDR1_FLD_SHIFT | SIMDR1_XXSTP; + tmp |= !cs_high << SIMDR1_SYNCAC_SHIFT; + tmp |= lsb_first << SIMDR1_BITLSB_SHIFT; + tmp |= sh_msiof_spi_get_dtdl_and_syncdl(p); + if (spi_controller_is_slave(p->ctlr)) { + sh_msiof_write(p, SITMDR1, tmp | SITMDR1_PCON); + } else { + sh_msiof_write(p, SITMDR1, + tmp | SIMDR1_TRMD | SITMDR1_PCON | + (ss < MAX_SS ? ss : 0) << SITMDR1_SYNCCH_SHIFT); + } + if (p->ctlr->flags & SPI_CONTROLLER_MUST_TX) { + /* These bits are reserved if RX needs TX */ + tmp &= ~0x0000ffff; + } + sh_msiof_write(p, SIRMDR1, tmp); + + tmp = 0; + tmp |= SICTR_TSCKIZ_SCK | cpol << SICTR_TSCKIZ_POL_SHIFT; + tmp |= SICTR_RSCKIZ_SCK | cpol << SICTR_RSCKIZ_POL_SHIFT; + + edge = cpol ^ !cpha; + + tmp |= edge << SICTR_TEDG_SHIFT; + tmp |= edge << SICTR_REDG_SHIFT; + tmp |= tx_hi_z ? SICTR_TXDIZ_HIZ : SICTR_TXDIZ_LOW; + sh_msiof_write(p, SICTR, tmp); +} + +static void sh_msiof_spi_set_mode_regs(struct sh_msiof_spi_priv *p, + const void *tx_buf, void *rx_buf, + u32 bits, u32 words) +{ + u32 dr2 = SIMDR2_BITLEN1(bits) | SIMDR2_WDLEN1(words); + + if (tx_buf || (p->ctlr->flags & SPI_CONTROLLER_MUST_TX)) + sh_msiof_write(p, SITMDR2, dr2); + else + sh_msiof_write(p, SITMDR2, dr2 | SIMDR2_GRPMASK1); + + if (rx_buf) + sh_msiof_write(p, SIRMDR2, dr2); +} + +static void sh_msiof_reset_str(struct sh_msiof_spi_priv *p) +{ + sh_msiof_write(p, SISTR, + sh_msiof_read(p, SISTR) & ~(SISTR_TDREQ | SISTR_RDREQ)); +} + +static void sh_msiof_spi_write_fifo_8(struct sh_msiof_spi_priv *p, + const void *tx_buf, int words, int fs) +{ + const u8 *buf_8 = tx_buf; + int k; + + for (k = 0; k < words; k++) + sh_msiof_write(p, SITFDR, buf_8[k] << fs); +} + +static void sh_msiof_spi_write_fifo_16(struct sh_msiof_spi_priv *p, + const void *tx_buf, int words, int fs) +{ + const u16 *buf_16 = tx_buf; + int k; + + for (k = 0; k < words; k++) + sh_msiof_write(p, SITFDR, buf_16[k] << fs); +} + +static void sh_msiof_spi_write_fifo_16u(struct sh_msiof_spi_priv *p, + const void *tx_buf, int words, int fs) +{ + const u16 *buf_16 = tx_buf; + int k; + + for (k = 0; k < words; k++) + sh_msiof_write(p, SITFDR, get_unaligned(&buf_16[k]) << fs); +} + +static void sh_msiof_spi_write_fifo_32(struct sh_msiof_spi_priv *p, + const void *tx_buf, int words, int fs) +{ + const u32 *buf_32 = tx_buf; + int k; + + for (k = 0; k < words; k++) + sh_msiof_write(p, SITFDR, buf_32[k] << fs); +} + +static void sh_msiof_spi_write_fifo_32u(struct sh_msiof_spi_priv *p, + const void *tx_buf, int words, int fs) +{ + const u32 *buf_32 = tx_buf; + int k; + + for (k = 0; k < words; k++) + sh_msiof_write(p, SITFDR, get_unaligned(&buf_32[k]) << fs); +} + +static void sh_msiof_spi_write_fifo_s32(struct sh_msiof_spi_priv *p, + const void *tx_buf, int words, int fs) +{ + const u32 *buf_32 = tx_buf; + int k; + + for (k = 0; k < words; k++) + sh_msiof_write(p, SITFDR, swab32(buf_32[k] << fs)); +} + +static void sh_msiof_spi_write_fifo_s32u(struct sh_msiof_spi_priv *p, + const void *tx_buf, int words, int fs) +{ + const u32 *buf_32 = tx_buf; + int k; + + for (k = 0; k < words; k++) + sh_msiof_write(p, SITFDR, swab32(get_unaligned(&buf_32[k]) << fs)); +} + +static void sh_msiof_spi_read_fifo_8(struct sh_msiof_spi_priv *p, + void *rx_buf, int words, int fs) +{ + u8 *buf_8 = rx_buf; + int k; + + for (k = 0; k < words; k++) + buf_8[k] = sh_msiof_read(p, SIRFDR) >> fs; +} + +static void sh_msiof_spi_read_fifo_16(struct sh_msiof_spi_priv *p, + void *rx_buf, int words, int fs) +{ + u16 *buf_16 = rx_buf; + int k; + + for (k = 0; k < words; k++) + buf_16[k] = sh_msiof_read(p, SIRFDR) >> fs; +} + +static void sh_msiof_spi_read_fifo_16u(struct sh_msiof_spi_priv *p, + void *rx_buf, int words, int fs) +{ + u16 *buf_16 = rx_buf; + int k; + + for (k = 0; k < words; k++) + put_unaligned(sh_msiof_read(p, SIRFDR) >> fs, &buf_16[k]); +} + +static void sh_msiof_spi_read_fifo_32(struct sh_msiof_spi_priv *p, + void *rx_buf, int words, int fs) +{ + u32 *buf_32 = rx_buf; + int k; + + for (k = 0; k < words; k++) + buf_32[k] = sh_msiof_read(p, SIRFDR) >> fs; +} + +static void sh_msiof_spi_read_fifo_32u(struct sh_msiof_spi_priv *p, + void *rx_buf, int words, int fs) +{ + u32 *buf_32 = rx_buf; + int k; + + for (k = 0; k < words; k++) + put_unaligned(sh_msiof_read(p, SIRFDR) >> fs, &buf_32[k]); +} + +static void sh_msiof_spi_read_fifo_s32(struct sh_msiof_spi_priv *p, + void *rx_buf, int words, int fs) +{ + u32 *buf_32 = rx_buf; + int k; + + for (k = 0; k < words; k++) + buf_32[k] = swab32(sh_msiof_read(p, SIRFDR) >> fs); +} + +static void sh_msiof_spi_read_fifo_s32u(struct sh_msiof_spi_priv *p, + void *rx_buf, int words, int fs) +{ + u32 *buf_32 = rx_buf; + int k; + + for (k = 0; k < words; k++) + put_unaligned(swab32(sh_msiof_read(p, SIRFDR) >> fs), &buf_32[k]); +} + +static int sh_msiof_spi_setup(struct spi_device *spi) +{ + struct sh_msiof_spi_priv *p = + spi_controller_get_devdata(spi->controller); + u32 clr, set, tmp; + + if (spi->cs_gpiod || spi_controller_is_slave(p->ctlr)) + return 0; + + if (p->native_cs_inited && + (p->native_cs_high == !!(spi->mode & SPI_CS_HIGH))) + return 0; + + /* Configure native chip select mode/polarity early */ + clr = SIMDR1_SYNCMD_MASK; + set = SIMDR1_SYNCMD_SPI; + if (spi->mode & SPI_CS_HIGH) + clr |= BIT(SIMDR1_SYNCAC_SHIFT); + else + set |= BIT(SIMDR1_SYNCAC_SHIFT); + pm_runtime_get_sync(&p->pdev->dev); + tmp = sh_msiof_read(p, SITMDR1) & ~clr; + sh_msiof_write(p, SITMDR1, tmp | set | SIMDR1_TRMD | SITMDR1_PCON); + tmp = sh_msiof_read(p, SIRMDR1) & ~clr; + sh_msiof_write(p, SIRMDR1, tmp | set); + pm_runtime_put(&p->pdev->dev); + p->native_cs_high = spi->mode & SPI_CS_HIGH; + p->native_cs_inited = true; + return 0; +} + +static int sh_msiof_prepare_message(struct spi_controller *ctlr, + struct spi_message *msg) +{ + struct sh_msiof_spi_priv *p = spi_controller_get_devdata(ctlr); + const struct spi_device *spi = msg->spi; + u32 ss, cs_high; + + /* Configure pins before asserting CS */ + if (spi->cs_gpiod) { + ss = ctlr->unused_native_cs; + cs_high = p->native_cs_high; + } else { + ss = spi->chip_select; + cs_high = !!(spi->mode & SPI_CS_HIGH); + } + sh_msiof_spi_set_pin_regs(p, ss, !!(spi->mode & SPI_CPOL), + !!(spi->mode & SPI_CPHA), + !!(spi->mode & SPI_3WIRE), + !!(spi->mode & SPI_LSB_FIRST), cs_high); + return 0; +} + +static int sh_msiof_spi_start(struct sh_msiof_spi_priv *p, void *rx_buf) +{ + bool slave = spi_controller_is_slave(p->ctlr); + int ret = 0; + + /* setup clock and rx/tx signals */ + if (!slave) + ret = sh_msiof_modify_ctr_wait(p, 0, SICTR_TSCKE); + if (rx_buf && !ret) + ret = sh_msiof_modify_ctr_wait(p, 0, SICTR_RXE); + if (!ret) + ret = sh_msiof_modify_ctr_wait(p, 0, SICTR_TXE); + + /* start by setting frame bit */ + if (!ret && !slave) + ret = sh_msiof_modify_ctr_wait(p, 0, SICTR_TFSE); + + return ret; +} + +static int sh_msiof_spi_stop(struct sh_msiof_spi_priv *p, void *rx_buf) +{ + bool slave = spi_controller_is_slave(p->ctlr); + int ret = 0; + + /* shut down frame, rx/tx and clock signals */ + if (!slave) + ret = sh_msiof_modify_ctr_wait(p, SICTR_TFSE, 0); + if (!ret) + ret = sh_msiof_modify_ctr_wait(p, SICTR_TXE, 0); + if (rx_buf && !ret) + ret = sh_msiof_modify_ctr_wait(p, SICTR_RXE, 0); + if (!ret && !slave) + ret = sh_msiof_modify_ctr_wait(p, SICTR_TSCKE, 0); + + return ret; +} + +static int sh_msiof_slave_abort(struct spi_controller *ctlr) +{ + struct sh_msiof_spi_priv *p = spi_controller_get_devdata(ctlr); + + p->slave_aborted = true; + complete(&p->done); + complete(&p->done_txdma); + return 0; +} + +static int sh_msiof_wait_for_completion(struct sh_msiof_spi_priv *p, + struct completion *x) +{ + if (spi_controller_is_slave(p->ctlr)) { + if (wait_for_completion_interruptible(x) || + p->slave_aborted) { + dev_dbg(&p->pdev->dev, "interrupted\n"); + return -EINTR; + } + } else { + if (!wait_for_completion_timeout(x, HZ)) { + dev_err(&p->pdev->dev, "timeout\n"); + return -ETIMEDOUT; + } + } + + return 0; +} + +static int sh_msiof_spi_txrx_once(struct sh_msiof_spi_priv *p, + void (*tx_fifo)(struct sh_msiof_spi_priv *, + const void *, int, int), + void (*rx_fifo)(struct sh_msiof_spi_priv *, + void *, int, int), + const void *tx_buf, void *rx_buf, + int words, int bits) +{ + int fifo_shift; + int ret; + + /* limit maximum word transfer to rx/tx fifo size */ + if (tx_buf) + words = min_t(int, words, p->tx_fifo_size); + if (rx_buf) + words = min_t(int, words, p->rx_fifo_size); + + /* the fifo contents need shifting */ + fifo_shift = 32 - bits; + + /* default FIFO watermarks for PIO */ + sh_msiof_write(p, SIFCTR, 0); + + /* setup msiof transfer mode registers */ + sh_msiof_spi_set_mode_regs(p, tx_buf, rx_buf, bits, words); + sh_msiof_write(p, SIIER, SIIER_TEOFE | SIIER_REOFE); + + /* write tx fifo */ + if (tx_buf) + tx_fifo(p, tx_buf, words, fifo_shift); + + reinit_completion(&p->done); + p->slave_aborted = false; + + ret = sh_msiof_spi_start(p, rx_buf); + if (ret) { + dev_err(&p->pdev->dev, "failed to start hardware\n"); + goto stop_ier; + } + + /* wait for tx fifo to be emptied / rx fifo to be filled */ + ret = sh_msiof_wait_for_completion(p, &p->done); + if (ret) + goto stop_reset; + + /* read rx fifo */ + if (rx_buf) + rx_fifo(p, rx_buf, words, fifo_shift); + + /* clear status bits */ + sh_msiof_reset_str(p); + + ret = sh_msiof_spi_stop(p, rx_buf); + if (ret) { + dev_err(&p->pdev->dev, "failed to shut down hardware\n"); + return ret; + } + + return words; + +stop_reset: + sh_msiof_reset_str(p); + sh_msiof_spi_stop(p, rx_buf); +stop_ier: + sh_msiof_write(p, SIIER, 0); + return ret; +} + +static void sh_msiof_dma_complete(void *arg) +{ + complete(arg); +} + +static int sh_msiof_dma_once(struct sh_msiof_spi_priv *p, const void *tx, + void *rx, unsigned int len) +{ + u32 ier_bits = 0; + struct dma_async_tx_descriptor *desc_tx = NULL, *desc_rx = NULL; + dma_cookie_t cookie; + int ret; + + /* First prepare and submit the DMA request(s), as this may fail */ + if (rx) { + ier_bits |= SIIER_RDREQE | SIIER_RDMAE; + desc_rx = dmaengine_prep_slave_single(p->ctlr->dma_rx, + p->rx_dma_addr, len, DMA_DEV_TO_MEM, + DMA_PREP_INTERRUPT | DMA_CTRL_ACK); + if (!desc_rx) + return -EAGAIN; + + desc_rx->callback = sh_msiof_dma_complete; + desc_rx->callback_param = &p->done; + cookie = dmaengine_submit(desc_rx); + if (dma_submit_error(cookie)) + return cookie; + } + + if (tx) { + ier_bits |= SIIER_TDREQE | SIIER_TDMAE; + dma_sync_single_for_device(p->ctlr->dma_tx->device->dev, + p->tx_dma_addr, len, DMA_TO_DEVICE); + desc_tx = dmaengine_prep_slave_single(p->ctlr->dma_tx, + p->tx_dma_addr, len, DMA_MEM_TO_DEV, + DMA_PREP_INTERRUPT | DMA_CTRL_ACK); + if (!desc_tx) { + ret = -EAGAIN; + goto no_dma_tx; + } + + desc_tx->callback = sh_msiof_dma_complete; + desc_tx->callback_param = &p->done_txdma; + cookie = dmaengine_submit(desc_tx); + if (dma_submit_error(cookie)) { + ret = cookie; + goto no_dma_tx; + } + } + + /* 1 stage FIFO watermarks for DMA */ + sh_msiof_write(p, SIFCTR, SIFCTR_TFWM_1 | SIFCTR_RFWM_1); + + /* setup msiof transfer mode registers (32-bit words) */ + sh_msiof_spi_set_mode_regs(p, tx, rx, 32, len / 4); + + sh_msiof_write(p, SIIER, ier_bits); + + reinit_completion(&p->done); + if (tx) + reinit_completion(&p->done_txdma); + p->slave_aborted = false; + + /* Now start DMA */ + if (rx) + dma_async_issue_pending(p->ctlr->dma_rx); + if (tx) + dma_async_issue_pending(p->ctlr->dma_tx); + + ret = sh_msiof_spi_start(p, rx); + if (ret) { + dev_err(&p->pdev->dev, "failed to start hardware\n"); + goto stop_dma; + } + + if (tx) { + /* wait for tx DMA completion */ + ret = sh_msiof_wait_for_completion(p, &p->done_txdma); + if (ret) + goto stop_reset; + } + + if (rx) { + /* wait for rx DMA completion */ + ret = sh_msiof_wait_for_completion(p, &p->done); + if (ret) + goto stop_reset; + + sh_msiof_write(p, SIIER, 0); + } else { + /* wait for tx fifo to be emptied */ + sh_msiof_write(p, SIIER, SIIER_TEOFE); + ret = sh_msiof_wait_for_completion(p, &p->done); + if (ret) + goto stop_reset; + } + + /* clear status bits */ + sh_msiof_reset_str(p); + + ret = sh_msiof_spi_stop(p, rx); + if (ret) { + dev_err(&p->pdev->dev, "failed to shut down hardware\n"); + return ret; + } + + if (rx) + dma_sync_single_for_cpu(p->ctlr->dma_rx->device->dev, + p->rx_dma_addr, len, DMA_FROM_DEVICE); + + return 0; + +stop_reset: + sh_msiof_reset_str(p); + sh_msiof_spi_stop(p, rx); +stop_dma: + if (tx) + dmaengine_terminate_all(p->ctlr->dma_tx); +no_dma_tx: + if (rx) + dmaengine_terminate_all(p->ctlr->dma_rx); + sh_msiof_write(p, SIIER, 0); + return ret; +} + +static void copy_bswap32(u32 *dst, const u32 *src, unsigned int words) +{ + /* src or dst can be unaligned, but not both */ + if ((unsigned long)src & 3) { + while (words--) { + *dst++ = swab32(get_unaligned(src)); + src++; + } + } else if ((unsigned long)dst & 3) { + while (words--) { + put_unaligned(swab32(*src++), dst); + dst++; + } + } else { + while (words--) + *dst++ = swab32(*src++); + } +} + +static void copy_wswap32(u32 *dst, const u32 *src, unsigned int words) +{ + /* src or dst can be unaligned, but not both */ + if ((unsigned long)src & 3) { + while (words--) { + *dst++ = swahw32(get_unaligned(src)); + src++; + } + } else if ((unsigned long)dst & 3) { + while (words--) { + put_unaligned(swahw32(*src++), dst); + dst++; + } + } else { + while (words--) + *dst++ = swahw32(*src++); + } +} + +static void copy_plain32(u32 *dst, const u32 *src, unsigned int words) +{ + memcpy(dst, src, words * 4); +} + +static int sh_msiof_transfer_one(struct spi_controller *ctlr, + struct spi_device *spi, + struct spi_transfer *t) +{ + struct sh_msiof_spi_priv *p = spi_controller_get_devdata(ctlr); + void (*copy32)(u32 *, const u32 *, unsigned int); + void (*tx_fifo)(struct sh_msiof_spi_priv *, const void *, int, int); + void (*rx_fifo)(struct sh_msiof_spi_priv *, void *, int, int); + const void *tx_buf = t->tx_buf; + void *rx_buf = t->rx_buf; + unsigned int len = t->len; + unsigned int bits = t->bits_per_word; + unsigned int bytes_per_word; + unsigned int words; + int n; + bool swab; + int ret; + + /* reset registers */ + sh_msiof_spi_reset_regs(p); + + /* setup clocks (clock already enabled in chipselect()) */ + if (!spi_controller_is_slave(p->ctlr)) + sh_msiof_spi_set_clk_regs(p, clk_get_rate(p->clk), t->speed_hz); + + while (ctlr->dma_tx && len > 15) { + /* + * DMA supports 32-bit words only, hence pack 8-bit and 16-bit + * words, with byte resp. word swapping. + */ + unsigned int l = 0; + + if (tx_buf) + l = min(round_down(len, 4), p->tx_fifo_size * 4); + if (rx_buf) + l = min(round_down(len, 4), p->rx_fifo_size * 4); + + if (bits <= 8) { + copy32 = copy_bswap32; + } else if (bits <= 16) { + copy32 = copy_wswap32; + } else { + copy32 = copy_plain32; + } + + if (tx_buf) + copy32(p->tx_dma_page, tx_buf, l / 4); + + ret = sh_msiof_dma_once(p, tx_buf, rx_buf, l); + if (ret == -EAGAIN) { + dev_warn_once(&p->pdev->dev, + "DMA not available, falling back to PIO\n"); + break; + } + if (ret) + return ret; + + if (rx_buf) { + copy32(rx_buf, p->rx_dma_page, l / 4); + rx_buf += l; + } + if (tx_buf) + tx_buf += l; + + len -= l; + if (!len) + return 0; + } + + if (bits <= 8 && len > 15) { + bits = 32; + swab = true; + } else { + swab = false; + } + + /* setup bytes per word and fifo read/write functions */ + if (bits <= 8) { + bytes_per_word = 1; + tx_fifo = sh_msiof_spi_write_fifo_8; + rx_fifo = sh_msiof_spi_read_fifo_8; + } else if (bits <= 16) { + bytes_per_word = 2; + if ((unsigned long)tx_buf & 0x01) + tx_fifo = sh_msiof_spi_write_fifo_16u; + else + tx_fifo = sh_msiof_spi_write_fifo_16; + + if ((unsigned long)rx_buf & 0x01) + rx_fifo = sh_msiof_spi_read_fifo_16u; + else + rx_fifo = sh_msiof_spi_read_fifo_16; + } else if (swab) { + bytes_per_word = 4; + if ((unsigned long)tx_buf & 0x03) + tx_fifo = sh_msiof_spi_write_fifo_s32u; + else + tx_fifo = sh_msiof_spi_write_fifo_s32; + + if ((unsigned long)rx_buf & 0x03) + rx_fifo = sh_msiof_spi_read_fifo_s32u; + else + rx_fifo = sh_msiof_spi_read_fifo_s32; + } else { + bytes_per_word = 4; + if ((unsigned long)tx_buf & 0x03) + tx_fifo = sh_msiof_spi_write_fifo_32u; + else + tx_fifo = sh_msiof_spi_write_fifo_32; + + if ((unsigned long)rx_buf & 0x03) + rx_fifo = sh_msiof_spi_read_fifo_32u; + else + rx_fifo = sh_msiof_spi_read_fifo_32; + } + + /* transfer in fifo sized chunks */ + words = len / bytes_per_word; + + while (words > 0) { + n = sh_msiof_spi_txrx_once(p, tx_fifo, rx_fifo, tx_buf, rx_buf, + words, bits); + if (n < 0) + return n; + + if (tx_buf) + tx_buf += n * bytes_per_word; + if (rx_buf) + rx_buf += n * bytes_per_word; + words -= n; + + if (words == 0 && (len % bytes_per_word)) { + words = len % bytes_per_word; + bits = t->bits_per_word; + bytes_per_word = 1; + tx_fifo = sh_msiof_spi_write_fifo_8; + rx_fifo = sh_msiof_spi_read_fifo_8; + } + } + + return 0; +} + +static const struct sh_msiof_chipdata sh_data = { + .bits_per_word_mask = SPI_BPW_RANGE_MASK(8, 32), + .tx_fifo_size = 64, + .rx_fifo_size = 64, + .ctlr_flags = 0, + .min_div_pow = 0, +}; + +static const struct sh_msiof_chipdata rcar_gen2_data = { + .bits_per_word_mask = SPI_BPW_MASK(8) | SPI_BPW_MASK(16) | + SPI_BPW_MASK(24) | SPI_BPW_MASK(32), + .tx_fifo_size = 64, + .rx_fifo_size = 64, + .ctlr_flags = SPI_CONTROLLER_MUST_TX, + .min_div_pow = 0, +}; + +static const struct sh_msiof_chipdata rcar_gen3_data = { + .bits_per_word_mask = SPI_BPW_MASK(8) | SPI_BPW_MASK(16) | + SPI_BPW_MASK(24) | SPI_BPW_MASK(32), + .tx_fifo_size = 64, + .rx_fifo_size = 64, + .ctlr_flags = SPI_CONTROLLER_MUST_TX, + .min_div_pow = 1, +}; + +static const struct sh_msiof_chipdata rcar_r8a7795_data = { + .bits_per_word_mask = SPI_BPW_MASK(8) | SPI_BPW_MASK(16) | + SPI_BPW_MASK(24) | SPI_BPW_MASK(32), + .tx_fifo_size = 64, + .rx_fifo_size = 64, + .ctlr_flags = SPI_CONTROLLER_MUST_TX, + .min_div_pow = 1, + .flags = SH_MSIOF_FLAG_FIXED_DTDL_200, +}; + +static const struct of_device_id sh_msiof_match[] = { + { .compatible = "renesas,sh-mobile-msiof", .data = &sh_data }, + { .compatible = "renesas,msiof-r8a7743", .data = &rcar_gen2_data }, + { .compatible = "renesas,msiof-r8a7745", .data = &rcar_gen2_data }, + { .compatible = "renesas,msiof-r8a7790", .data = &rcar_gen2_data }, + { .compatible = "renesas,msiof-r8a7791", .data = &rcar_gen2_data }, + { .compatible = "renesas,msiof-r8a7792", .data = &rcar_gen2_data }, + { .compatible = "renesas,msiof-r8a7793", .data = &rcar_gen2_data }, + { .compatible = "renesas,msiof-r8a7794", .data = &rcar_gen2_data }, + { .compatible = "renesas,rcar-gen2-msiof", .data = &rcar_gen2_data }, + { .compatible = "renesas,msiof-r8a7795", .data = &rcar_r8a7795_data }, + { .compatible = "renesas,msiof-r8a7796", .data = &rcar_gen3_data }, + { .compatible = "renesas,rcar-gen3-msiof", .data = &rcar_gen3_data }, + { .compatible = "renesas,sh-msiof", .data = &sh_data }, /* Deprecated */ + {}, +}; +MODULE_DEVICE_TABLE(of, sh_msiof_match); + +#ifdef CONFIG_OF +static struct sh_msiof_spi_info *sh_msiof_spi_parse_dt(struct device *dev) +{ + struct sh_msiof_spi_info *info; + struct device_node *np = dev->of_node; + u32 num_cs = 1; + + info = devm_kzalloc(dev, sizeof(struct sh_msiof_spi_info), GFP_KERNEL); + if (!info) + return NULL; + + info->mode = of_property_read_bool(np, "spi-slave") ? MSIOF_SPI_SLAVE + : MSIOF_SPI_MASTER; + + /* Parse the MSIOF properties */ + if (info->mode == MSIOF_SPI_MASTER) + of_property_read_u32(np, "num-cs", &num_cs); + of_property_read_u32(np, "renesas,tx-fifo-size", + &info->tx_fifo_override); + of_property_read_u32(np, "renesas,rx-fifo-size", + &info->rx_fifo_override); + of_property_read_u32(np, "renesas,dtdl", &info->dtdl); + of_property_read_u32(np, "renesas,syncdl", &info->syncdl); + + info->num_chipselect = num_cs; + + return info; +} +#else +static struct sh_msiof_spi_info *sh_msiof_spi_parse_dt(struct device *dev) +{ + return NULL; +} +#endif + +static struct dma_chan *sh_msiof_request_dma_chan(struct device *dev, + enum dma_transfer_direction dir, unsigned int id, dma_addr_t port_addr) +{ + dma_cap_mask_t mask; + struct dma_chan *chan; + struct dma_slave_config cfg; + int ret; + + dma_cap_zero(mask); + dma_cap_set(DMA_SLAVE, mask); + + chan = dma_request_slave_channel_compat(mask, shdma_chan_filter, + (void *)(unsigned long)id, dev, + dir == DMA_MEM_TO_DEV ? "tx" : "rx"); + if (!chan) { + dev_warn(dev, "dma_request_slave_channel_compat failed\n"); + return NULL; + } + + memset(&cfg, 0, sizeof(cfg)); + cfg.direction = dir; + if (dir == DMA_MEM_TO_DEV) { + cfg.dst_addr = port_addr; + cfg.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES; + } else { + cfg.src_addr = port_addr; + cfg.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES; + } + + ret = dmaengine_slave_config(chan, &cfg); + if (ret) { + dev_warn(dev, "dmaengine_slave_config failed %d\n", ret); + dma_release_channel(chan); + return NULL; + } + + return chan; +} + +static int sh_msiof_request_dma(struct sh_msiof_spi_priv *p) +{ + struct platform_device *pdev = p->pdev; + struct device *dev = &pdev->dev; + const struct sh_msiof_spi_info *info = p->info; + unsigned int dma_tx_id, dma_rx_id; + const struct resource *res; + struct spi_controller *ctlr; + struct device *tx_dev, *rx_dev; + + if (dev->of_node) { + /* In the OF case we will get the slave IDs from the DT */ + dma_tx_id = 0; + dma_rx_id = 0; + } else if (info && info->dma_tx_id && info->dma_rx_id) { + dma_tx_id = info->dma_tx_id; + dma_rx_id = info->dma_rx_id; + } else { + /* The driver assumes no error */ + return 0; + } + + /* The DMA engine uses the second register set, if present */ + res = platform_get_resource(pdev, IORESOURCE_MEM, 1); + if (!res) + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + + ctlr = p->ctlr; + ctlr->dma_tx = sh_msiof_request_dma_chan(dev, DMA_MEM_TO_DEV, + dma_tx_id, res->start + SITFDR); + if (!ctlr->dma_tx) + return -ENODEV; + + ctlr->dma_rx = sh_msiof_request_dma_chan(dev, DMA_DEV_TO_MEM, + dma_rx_id, res->start + SIRFDR); + if (!ctlr->dma_rx) + goto free_tx_chan; + + p->tx_dma_page = (void *)__get_free_page(GFP_KERNEL | GFP_DMA); + if (!p->tx_dma_page) + goto free_rx_chan; + + p->rx_dma_page = (void *)__get_free_page(GFP_KERNEL | GFP_DMA); + if (!p->rx_dma_page) + goto free_tx_page; + + tx_dev = ctlr->dma_tx->device->dev; + p->tx_dma_addr = dma_map_single(tx_dev, p->tx_dma_page, PAGE_SIZE, + DMA_TO_DEVICE); + if (dma_mapping_error(tx_dev, p->tx_dma_addr)) + goto free_rx_page; + + rx_dev = ctlr->dma_rx->device->dev; + p->rx_dma_addr = dma_map_single(rx_dev, p->rx_dma_page, PAGE_SIZE, + DMA_FROM_DEVICE); + if (dma_mapping_error(rx_dev, p->rx_dma_addr)) + goto unmap_tx_page; + + dev_info(dev, "DMA available"); + return 0; + +unmap_tx_page: + dma_unmap_single(tx_dev, p->tx_dma_addr, PAGE_SIZE, DMA_TO_DEVICE); +free_rx_page: + free_page((unsigned long)p->rx_dma_page); +free_tx_page: + free_page((unsigned long)p->tx_dma_page); +free_rx_chan: + dma_release_channel(ctlr->dma_rx); +free_tx_chan: + dma_release_channel(ctlr->dma_tx); + ctlr->dma_tx = NULL; + return -ENODEV; +} + +static void sh_msiof_release_dma(struct sh_msiof_spi_priv *p) +{ + struct spi_controller *ctlr = p->ctlr; + + if (!ctlr->dma_tx) + return; + + dma_unmap_single(ctlr->dma_rx->device->dev, p->rx_dma_addr, PAGE_SIZE, + DMA_FROM_DEVICE); + dma_unmap_single(ctlr->dma_tx->device->dev, p->tx_dma_addr, PAGE_SIZE, + DMA_TO_DEVICE); + free_page((unsigned long)p->rx_dma_page); + free_page((unsigned long)p->tx_dma_page); + dma_release_channel(ctlr->dma_rx); + dma_release_channel(ctlr->dma_tx); +} + +static int sh_msiof_spi_probe(struct platform_device *pdev) +{ + struct spi_controller *ctlr; + const struct sh_msiof_chipdata *chipdata; + struct sh_msiof_spi_info *info; + struct sh_msiof_spi_priv *p; + int i; + int ret; + + chipdata = of_device_get_match_data(&pdev->dev); + if (chipdata) { + info = sh_msiof_spi_parse_dt(&pdev->dev); + } else { + chipdata = (const void *)pdev->id_entry->driver_data; + info = dev_get_platdata(&pdev->dev); + } + + if (!info) { + dev_err(&pdev->dev, "failed to obtain device info\n"); + return -ENXIO; + } + + if (chipdata->flags & SH_MSIOF_FLAG_FIXED_DTDL_200) + info->dtdl = 200; + + if (info->mode == MSIOF_SPI_SLAVE) + ctlr = spi_alloc_slave(&pdev->dev, + sizeof(struct sh_msiof_spi_priv)); + else + ctlr = spi_alloc_master(&pdev->dev, + sizeof(struct sh_msiof_spi_priv)); + if (ctlr == NULL) + return -ENOMEM; + + p = spi_controller_get_devdata(ctlr); + + platform_set_drvdata(pdev, p); + p->ctlr = ctlr; + p->info = info; + p->min_div_pow = chipdata->min_div_pow; + + init_completion(&p->done); + init_completion(&p->done_txdma); + + p->clk = devm_clk_get(&pdev->dev, NULL); + if (IS_ERR(p->clk)) { + dev_err(&pdev->dev, "cannot get clock\n"); + ret = PTR_ERR(p->clk); + goto err1; + } + + i = platform_get_irq(pdev, 0); + if (i < 0) { + ret = i; + goto err1; + } + + p->mapbase = devm_platform_ioremap_resource(pdev, 0); + if (IS_ERR(p->mapbase)) { + ret = PTR_ERR(p->mapbase); + goto err1; + } + + ret = devm_request_irq(&pdev->dev, i, sh_msiof_spi_irq, 0, + dev_name(&pdev->dev), p); + if (ret) { + dev_err(&pdev->dev, "unable to request irq\n"); + goto err1; + } + + p->pdev = pdev; + pm_runtime_enable(&pdev->dev); + + /* Platform data may override FIFO sizes */ + p->tx_fifo_size = chipdata->tx_fifo_size; + p->rx_fifo_size = chipdata->rx_fifo_size; + if (p->info->tx_fifo_override) + p->tx_fifo_size = p->info->tx_fifo_override; + if (p->info->rx_fifo_override) + p->rx_fifo_size = p->info->rx_fifo_override; + + /* init controller code */ + ctlr->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH; + ctlr->mode_bits |= SPI_LSB_FIRST | SPI_3WIRE; + ctlr->flags = chipdata->ctlr_flags; + ctlr->bus_num = pdev->id; + ctlr->num_chipselect = p->info->num_chipselect; + ctlr->dev.of_node = pdev->dev.of_node; + ctlr->setup = sh_msiof_spi_setup; + ctlr->prepare_message = sh_msiof_prepare_message; + ctlr->slave_abort = sh_msiof_slave_abort; + ctlr->bits_per_word_mask = chipdata->bits_per_word_mask; + ctlr->auto_runtime_pm = true; + ctlr->transfer_one = sh_msiof_transfer_one; + ctlr->use_gpio_descriptors = true; + ctlr->max_native_cs = MAX_SS; + + ret = sh_msiof_request_dma(p); + if (ret < 0) + dev_warn(&pdev->dev, "DMA not available, using PIO\n"); + + ret = devm_spi_register_controller(&pdev->dev, ctlr); + if (ret < 0) { + dev_err(&pdev->dev, "devm_spi_register_controller error.\n"); + goto err2; + } + + return 0; + + err2: + sh_msiof_release_dma(p); + pm_runtime_disable(&pdev->dev); + err1: + spi_controller_put(ctlr); + return ret; +} + +static int sh_msiof_spi_remove(struct platform_device *pdev) +{ + struct sh_msiof_spi_priv *p = platform_get_drvdata(pdev); + + sh_msiof_release_dma(p); + pm_runtime_disable(&pdev->dev); + return 0; +} + +static const struct platform_device_id spi_driver_ids[] = { + { "spi_sh_msiof", (kernel_ulong_t)&sh_data }, + {}, +}; +MODULE_DEVICE_TABLE(platform, spi_driver_ids); + +#ifdef CONFIG_PM_SLEEP +static int sh_msiof_spi_suspend(struct device *dev) +{ + struct sh_msiof_spi_priv *p = dev_get_drvdata(dev); + + return spi_controller_suspend(p->ctlr); +} + +static int sh_msiof_spi_resume(struct device *dev) +{ + struct sh_msiof_spi_priv *p = dev_get_drvdata(dev); + + return spi_controller_resume(p->ctlr); +} + +static SIMPLE_DEV_PM_OPS(sh_msiof_spi_pm_ops, sh_msiof_spi_suspend, + sh_msiof_spi_resume); +#define DEV_PM_OPS (&sh_msiof_spi_pm_ops) +#else +#define DEV_PM_OPS NULL +#endif /* CONFIG_PM_SLEEP */ + +static struct platform_driver sh_msiof_spi_drv = { + .probe = sh_msiof_spi_probe, + .remove = sh_msiof_spi_remove, + .id_table = spi_driver_ids, + .driver = { + .name = "spi_sh_msiof", + .pm = DEV_PM_OPS, + .of_match_table = of_match_ptr(sh_msiof_match), + }, +}; +module_platform_driver(sh_msiof_spi_drv); + +MODULE_DESCRIPTION("SuperH MSIOF SPI Controller Interface Driver"); +MODULE_AUTHOR("Magnus Damm"); +MODULE_LICENSE("GPL v2"); +MODULE_ALIAS("platform:spi_sh_msiof"); diff --git a/drivers/spi/spi-sh-sci.c b/drivers/spi/spi-sh-sci.c new file mode 100644 index 000000000..8f30531e1 --- /dev/null +++ b/drivers/spi/spi-sh-sci.c @@ -0,0 +1,197 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * SH SCI SPI interface + * + * Copyright (c) 2008 Magnus Damm + * + * Based on S3C24XX GPIO based SPI driver, which is: + * Copyright (c) 2006 Ben Dooks + * Copyright (c) 2006 Simtec Electronics + */ + +#include <linux/kernel.h> +#include <linux/delay.h> +#include <linux/spinlock.h> +#include <linux/platform_device.h> + +#include <linux/spi/spi.h> +#include <linux/spi/spi_bitbang.h> +#include <linux/module.h> + +#include <asm/spi.h> +#include <asm/io.h> + +struct sh_sci_spi { + struct spi_bitbang bitbang; + + void __iomem *membase; + unsigned char val; + struct sh_spi_info *info; + struct platform_device *dev; +}; + +#define SCSPTR(sp) (sp->membase + 0x1c) +#define PIN_SCK (1 << 2) +#define PIN_TXD (1 << 0) +#define PIN_RXD PIN_TXD +#define PIN_INIT ((1 << 1) | (1 << 3) | PIN_SCK | PIN_TXD) + +static inline void setbits(struct sh_sci_spi *sp, int bits, int on) +{ + /* + * We are the only user of SCSPTR so no locking is required. + * Reading bit 2 and 0 in SCSPTR gives pin state as input. + * Writing the same bits sets the output value. + * This makes regular read-modify-write difficult so we + * use sp->val to keep track of the latest register value. + */ + + if (on) + sp->val |= bits; + else + sp->val &= ~bits; + + iowrite8(sp->val, SCSPTR(sp)); +} + +static inline void setsck(struct spi_device *dev, int on) +{ + setbits(spi_master_get_devdata(dev->master), PIN_SCK, on); +} + +static inline void setmosi(struct spi_device *dev, int on) +{ + setbits(spi_master_get_devdata(dev->master), PIN_TXD, on); +} + +static inline u32 getmiso(struct spi_device *dev) +{ + struct sh_sci_spi *sp = spi_master_get_devdata(dev->master); + + return (ioread8(SCSPTR(sp)) & PIN_RXD) ? 1 : 0; +} + +#define spidelay(x) ndelay(x) + +#include "spi-bitbang-txrx.h" + +static u32 sh_sci_spi_txrx_mode0(struct spi_device *spi, + unsigned nsecs, u32 word, u8 bits, + unsigned flags) +{ + return bitbang_txrx_be_cpha0(spi, nsecs, 0, flags, word, bits); +} + +static u32 sh_sci_spi_txrx_mode1(struct spi_device *spi, + unsigned nsecs, u32 word, u8 bits, + unsigned flags) +{ + return bitbang_txrx_be_cpha1(spi, nsecs, 0, flags, word, bits); +} + +static u32 sh_sci_spi_txrx_mode2(struct spi_device *spi, + unsigned nsecs, u32 word, u8 bits, + unsigned flags) +{ + return bitbang_txrx_be_cpha0(spi, nsecs, 1, flags, word, bits); +} + +static u32 sh_sci_spi_txrx_mode3(struct spi_device *spi, + unsigned nsecs, u32 word, u8 bits, + unsigned flags) +{ + return bitbang_txrx_be_cpha1(spi, nsecs, 1, flags, word, bits); +} + +static void sh_sci_spi_chipselect(struct spi_device *dev, int value) +{ + struct sh_sci_spi *sp = spi_master_get_devdata(dev->master); + + if (sp->info->chip_select) + (sp->info->chip_select)(sp->info, dev->chip_select, value); +} + +static int sh_sci_spi_probe(struct platform_device *dev) +{ + struct resource *r; + struct spi_master *master; + struct sh_sci_spi *sp; + int ret; + + master = spi_alloc_master(&dev->dev, sizeof(struct sh_sci_spi)); + if (master == NULL) { + dev_err(&dev->dev, "failed to allocate spi master\n"); + ret = -ENOMEM; + goto err0; + } + + sp = spi_master_get_devdata(master); + + platform_set_drvdata(dev, sp); + sp->info = dev_get_platdata(&dev->dev); + if (!sp->info) { + dev_err(&dev->dev, "platform data is missing\n"); + ret = -ENOENT; + goto err1; + } + + /* setup spi bitbang adaptor */ + sp->bitbang.master = master; + sp->bitbang.master->bus_num = sp->info->bus_num; + sp->bitbang.master->num_chipselect = sp->info->num_chipselect; + sp->bitbang.chipselect = sh_sci_spi_chipselect; + + sp->bitbang.txrx_word[SPI_MODE_0] = sh_sci_spi_txrx_mode0; + sp->bitbang.txrx_word[SPI_MODE_1] = sh_sci_spi_txrx_mode1; + sp->bitbang.txrx_word[SPI_MODE_2] = sh_sci_spi_txrx_mode2; + sp->bitbang.txrx_word[SPI_MODE_3] = sh_sci_spi_txrx_mode3; + + r = platform_get_resource(dev, IORESOURCE_MEM, 0); + if (r == NULL) { + ret = -ENOENT; + goto err1; + } + sp->membase = ioremap(r->start, resource_size(r)); + if (!sp->membase) { + ret = -ENXIO; + goto err1; + } + sp->val = ioread8(SCSPTR(sp)); + setbits(sp, PIN_INIT, 1); + + ret = spi_bitbang_start(&sp->bitbang); + if (!ret) + return 0; + + setbits(sp, PIN_INIT, 0); + iounmap(sp->membase); + err1: + spi_master_put(sp->bitbang.master); + err0: + return ret; +} + +static int sh_sci_spi_remove(struct platform_device *dev) +{ + struct sh_sci_spi *sp = platform_get_drvdata(dev); + + spi_bitbang_stop(&sp->bitbang); + setbits(sp, PIN_INIT, 0); + iounmap(sp->membase); + spi_master_put(sp->bitbang.master); + return 0; +} + +static struct platform_driver sh_sci_spi_drv = { + .probe = sh_sci_spi_probe, + .remove = sh_sci_spi_remove, + .driver = { + .name = "spi_sh_sci", + }, +}; +module_platform_driver(sh_sci_spi_drv); + +MODULE_DESCRIPTION("SH SCI SPI Driver"); +MODULE_AUTHOR("Magnus Damm <damm@opensource.se>"); +MODULE_LICENSE("GPL"); +MODULE_ALIAS("platform:spi_sh_sci"); diff --git a/drivers/spi/spi-sh.c b/drivers/spi/spi-sh.c new file mode 100644 index 000000000..15123a8f4 --- /dev/null +++ b/drivers/spi/spi-sh.c @@ -0,0 +1,512 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * SH SPI bus driver + * + * Copyright (C) 2011 Renesas Solutions Corp. + * + * Based on pxa2xx_spi.c: + * Copyright (C) 2005 Stephen Street / StreetFire Sound Labs + */ + +#include <linux/module.h> +#include <linux/kernel.h> +#include <linux/sched.h> +#include <linux/errno.h> +#include <linux/timer.h> +#include <linux/delay.h> +#include <linux/list.h> +#include <linux/workqueue.h> +#include <linux/interrupt.h> +#include <linux/platform_device.h> +#include <linux/io.h> +#include <linux/spi/spi.h> + +#define SPI_SH_TBR 0x00 +#define SPI_SH_RBR 0x00 +#define SPI_SH_CR1 0x08 +#define SPI_SH_CR2 0x10 +#define SPI_SH_CR3 0x18 +#define SPI_SH_CR4 0x20 +#define SPI_SH_CR5 0x28 + +/* CR1 */ +#define SPI_SH_TBE 0x80 +#define SPI_SH_TBF 0x40 +#define SPI_SH_RBE 0x20 +#define SPI_SH_RBF 0x10 +#define SPI_SH_PFONRD 0x08 +#define SPI_SH_SSDB 0x04 +#define SPI_SH_SSD 0x02 +#define SPI_SH_SSA 0x01 + +/* CR2 */ +#define SPI_SH_RSTF 0x80 +#define SPI_SH_LOOPBK 0x40 +#define SPI_SH_CPOL 0x20 +#define SPI_SH_CPHA 0x10 +#define SPI_SH_L1M0 0x08 + +/* CR3 */ +#define SPI_SH_MAX_BYTE 0xFF + +/* CR4 */ +#define SPI_SH_TBEI 0x80 +#define SPI_SH_TBFI 0x40 +#define SPI_SH_RBEI 0x20 +#define SPI_SH_RBFI 0x10 +#define SPI_SH_WPABRT 0x04 +#define SPI_SH_SSS 0x01 + +/* CR8 */ +#define SPI_SH_P1L0 0x80 +#define SPI_SH_PP1L0 0x40 +#define SPI_SH_MUXI 0x20 +#define SPI_SH_MUXIRQ 0x10 + +#define SPI_SH_FIFO_SIZE 32 +#define SPI_SH_SEND_TIMEOUT (3 * HZ) +#define SPI_SH_RECEIVE_TIMEOUT (HZ >> 3) + +#undef DEBUG + +struct spi_sh_data { + void __iomem *addr; + int irq; + struct spi_master *master; + struct list_head queue; + struct work_struct ws; + unsigned long cr1; + wait_queue_head_t wait; + spinlock_t lock; + int width; +}; + +static void spi_sh_write(struct spi_sh_data *ss, unsigned long data, + unsigned long offset) +{ + if (ss->width == 8) + iowrite8(data, ss->addr + (offset >> 2)); + else if (ss->width == 32) + iowrite32(data, ss->addr + offset); +} + +static unsigned long spi_sh_read(struct spi_sh_data *ss, unsigned long offset) +{ + if (ss->width == 8) + return ioread8(ss->addr + (offset >> 2)); + else if (ss->width == 32) + return ioread32(ss->addr + offset); + else + return 0; +} + +static void spi_sh_set_bit(struct spi_sh_data *ss, unsigned long val, + unsigned long offset) +{ + unsigned long tmp; + + tmp = spi_sh_read(ss, offset); + tmp |= val; + spi_sh_write(ss, tmp, offset); +} + +static void spi_sh_clear_bit(struct spi_sh_data *ss, unsigned long val, + unsigned long offset) +{ + unsigned long tmp; + + tmp = spi_sh_read(ss, offset); + tmp &= ~val; + spi_sh_write(ss, tmp, offset); +} + +static void clear_fifo(struct spi_sh_data *ss) +{ + spi_sh_set_bit(ss, SPI_SH_RSTF, SPI_SH_CR2); + spi_sh_clear_bit(ss, SPI_SH_RSTF, SPI_SH_CR2); +} + +static int spi_sh_wait_receive_buffer(struct spi_sh_data *ss) +{ + int timeout = 100000; + + while (spi_sh_read(ss, SPI_SH_CR1) & SPI_SH_RBE) { + udelay(10); + if (timeout-- < 0) + return -ETIMEDOUT; + } + return 0; +} + +static int spi_sh_wait_write_buffer_empty(struct spi_sh_data *ss) +{ + int timeout = 100000; + + while (!(spi_sh_read(ss, SPI_SH_CR1) & SPI_SH_TBE)) { + udelay(10); + if (timeout-- < 0) + return -ETIMEDOUT; + } + return 0; +} + +static int spi_sh_send(struct spi_sh_data *ss, struct spi_message *mesg, + struct spi_transfer *t) +{ + int i, retval = 0; + int remain = t->len; + int cur_len; + unsigned char *data; + long ret; + + if (t->len) + spi_sh_set_bit(ss, SPI_SH_SSA, SPI_SH_CR1); + + data = (unsigned char *)t->tx_buf; + while (remain > 0) { + cur_len = min(SPI_SH_FIFO_SIZE, remain); + for (i = 0; i < cur_len && + !(spi_sh_read(ss, SPI_SH_CR4) & + SPI_SH_WPABRT) && + !(spi_sh_read(ss, SPI_SH_CR1) & SPI_SH_TBF); + i++) + spi_sh_write(ss, (unsigned long)data[i], SPI_SH_TBR); + + if (spi_sh_read(ss, SPI_SH_CR4) & SPI_SH_WPABRT) { + /* Abort SPI operation */ + spi_sh_set_bit(ss, SPI_SH_WPABRT, SPI_SH_CR4); + retval = -EIO; + break; + } + + cur_len = i; + + remain -= cur_len; + data += cur_len; + + if (remain > 0) { + ss->cr1 &= ~SPI_SH_TBE; + spi_sh_set_bit(ss, SPI_SH_TBE, SPI_SH_CR4); + ret = wait_event_interruptible_timeout(ss->wait, + ss->cr1 & SPI_SH_TBE, + SPI_SH_SEND_TIMEOUT); + if (ret == 0 && !(ss->cr1 & SPI_SH_TBE)) { + printk(KERN_ERR "%s: timeout\n", __func__); + return -ETIMEDOUT; + } + } + } + + if (list_is_last(&t->transfer_list, &mesg->transfers)) { + spi_sh_clear_bit(ss, SPI_SH_SSD | SPI_SH_SSDB, SPI_SH_CR1); + spi_sh_set_bit(ss, SPI_SH_SSA, SPI_SH_CR1); + + ss->cr1 &= ~SPI_SH_TBE; + spi_sh_set_bit(ss, SPI_SH_TBE, SPI_SH_CR4); + ret = wait_event_interruptible_timeout(ss->wait, + ss->cr1 & SPI_SH_TBE, + SPI_SH_SEND_TIMEOUT); + if (ret == 0 && (ss->cr1 & SPI_SH_TBE)) { + printk(KERN_ERR "%s: timeout\n", __func__); + return -ETIMEDOUT; + } + } + + return retval; +} + +static int spi_sh_receive(struct spi_sh_data *ss, struct spi_message *mesg, + struct spi_transfer *t) +{ + int i; + int remain = t->len; + int cur_len; + unsigned char *data; + long ret; + + if (t->len > SPI_SH_MAX_BYTE) + spi_sh_write(ss, SPI_SH_MAX_BYTE, SPI_SH_CR3); + else + spi_sh_write(ss, t->len, SPI_SH_CR3); + + spi_sh_clear_bit(ss, SPI_SH_SSD | SPI_SH_SSDB, SPI_SH_CR1); + spi_sh_set_bit(ss, SPI_SH_SSA, SPI_SH_CR1); + + spi_sh_wait_write_buffer_empty(ss); + + data = (unsigned char *)t->rx_buf; + while (remain > 0) { + if (remain >= SPI_SH_FIFO_SIZE) { + ss->cr1 &= ~SPI_SH_RBF; + spi_sh_set_bit(ss, SPI_SH_RBF, SPI_SH_CR4); + ret = wait_event_interruptible_timeout(ss->wait, + ss->cr1 & SPI_SH_RBF, + SPI_SH_RECEIVE_TIMEOUT); + if (ret == 0 && + spi_sh_read(ss, SPI_SH_CR1) & SPI_SH_RBE) { + printk(KERN_ERR "%s: timeout\n", __func__); + return -ETIMEDOUT; + } + } + + cur_len = min(SPI_SH_FIFO_SIZE, remain); + for (i = 0; i < cur_len; i++) { + if (spi_sh_wait_receive_buffer(ss)) + break; + data[i] = (unsigned char)spi_sh_read(ss, SPI_SH_RBR); + } + + remain -= cur_len; + data += cur_len; + } + + /* deassert CS when SPI is receiving. */ + if (t->len > SPI_SH_MAX_BYTE) { + clear_fifo(ss); + spi_sh_write(ss, 1, SPI_SH_CR3); + } else { + spi_sh_write(ss, 0, SPI_SH_CR3); + } + + return 0; +} + +static void spi_sh_work(struct work_struct *work) +{ + struct spi_sh_data *ss = container_of(work, struct spi_sh_data, ws); + struct spi_message *mesg; + struct spi_transfer *t; + unsigned long flags; + int ret; + + pr_debug("%s: enter\n", __func__); + + spin_lock_irqsave(&ss->lock, flags); + while (!list_empty(&ss->queue)) { + mesg = list_entry(ss->queue.next, struct spi_message, queue); + list_del_init(&mesg->queue); + + spin_unlock_irqrestore(&ss->lock, flags); + list_for_each_entry(t, &mesg->transfers, transfer_list) { + pr_debug("tx_buf = %p, rx_buf = %p\n", + t->tx_buf, t->rx_buf); + pr_debug("len = %d, delay_usecs = %d\n", + t->len, t->delay_usecs); + + if (t->tx_buf) { + ret = spi_sh_send(ss, mesg, t); + if (ret < 0) + goto error; + } + if (t->rx_buf) { + ret = spi_sh_receive(ss, mesg, t); + if (ret < 0) + goto error; + } + mesg->actual_length += t->len; + } + spin_lock_irqsave(&ss->lock, flags); + + mesg->status = 0; + if (mesg->complete) + mesg->complete(mesg->context); + } + + clear_fifo(ss); + spi_sh_set_bit(ss, SPI_SH_SSD, SPI_SH_CR1); + udelay(100); + + spi_sh_clear_bit(ss, SPI_SH_SSA | SPI_SH_SSDB | SPI_SH_SSD, + SPI_SH_CR1); + + clear_fifo(ss); + + spin_unlock_irqrestore(&ss->lock, flags); + + return; + + error: + mesg->status = ret; + if (mesg->complete) + mesg->complete(mesg->context); + + spi_sh_clear_bit(ss, SPI_SH_SSA | SPI_SH_SSDB | SPI_SH_SSD, + SPI_SH_CR1); + clear_fifo(ss); + +} + +static int spi_sh_setup(struct spi_device *spi) +{ + struct spi_sh_data *ss = spi_master_get_devdata(spi->master); + + pr_debug("%s: enter\n", __func__); + + spi_sh_write(ss, 0xfe, SPI_SH_CR1); /* SPI sycle stop */ + spi_sh_write(ss, 0x00, SPI_SH_CR1); /* CR1 init */ + spi_sh_write(ss, 0x00, SPI_SH_CR3); /* CR3 init */ + + clear_fifo(ss); + + /* 1/8 clock */ + spi_sh_write(ss, spi_sh_read(ss, SPI_SH_CR2) | 0x07, SPI_SH_CR2); + udelay(10); + + return 0; +} + +static int spi_sh_transfer(struct spi_device *spi, struct spi_message *mesg) +{ + struct spi_sh_data *ss = spi_master_get_devdata(spi->master); + unsigned long flags; + + pr_debug("%s: enter\n", __func__); + pr_debug("\tmode = %02x\n", spi->mode); + + spin_lock_irqsave(&ss->lock, flags); + + mesg->actual_length = 0; + mesg->status = -EINPROGRESS; + + spi_sh_clear_bit(ss, SPI_SH_SSA, SPI_SH_CR1); + + list_add_tail(&mesg->queue, &ss->queue); + schedule_work(&ss->ws); + + spin_unlock_irqrestore(&ss->lock, flags); + + return 0; +} + +static void spi_sh_cleanup(struct spi_device *spi) +{ + struct spi_sh_data *ss = spi_master_get_devdata(spi->master); + + pr_debug("%s: enter\n", __func__); + + spi_sh_clear_bit(ss, SPI_SH_SSA | SPI_SH_SSDB | SPI_SH_SSD, + SPI_SH_CR1); +} + +static irqreturn_t spi_sh_irq(int irq, void *_ss) +{ + struct spi_sh_data *ss = (struct spi_sh_data *)_ss; + unsigned long cr1; + + cr1 = spi_sh_read(ss, SPI_SH_CR1); + if (cr1 & SPI_SH_TBE) + ss->cr1 |= SPI_SH_TBE; + if (cr1 & SPI_SH_TBF) + ss->cr1 |= SPI_SH_TBF; + if (cr1 & SPI_SH_RBE) + ss->cr1 |= SPI_SH_RBE; + if (cr1 & SPI_SH_RBF) + ss->cr1 |= SPI_SH_RBF; + + if (ss->cr1) { + spi_sh_clear_bit(ss, ss->cr1, SPI_SH_CR4); + wake_up(&ss->wait); + } + + return IRQ_HANDLED; +} + +static int spi_sh_remove(struct platform_device *pdev) +{ + struct spi_sh_data *ss = platform_get_drvdata(pdev); + + spi_unregister_master(ss->master); + flush_work(&ss->ws); + free_irq(ss->irq, ss); + + return 0; +} + +static int spi_sh_probe(struct platform_device *pdev) +{ + struct resource *res; + struct spi_master *master; + struct spi_sh_data *ss; + int ret, irq; + + /* get base addr */ + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + if (unlikely(res == NULL)) { + dev_err(&pdev->dev, "invalid resource\n"); + return -EINVAL; + } + + irq = platform_get_irq(pdev, 0); + if (irq < 0) + return irq; + + master = devm_spi_alloc_master(&pdev->dev, sizeof(struct spi_sh_data)); + if (master == NULL) { + dev_err(&pdev->dev, "spi_alloc_master error.\n"); + return -ENOMEM; + } + + ss = spi_master_get_devdata(master); + platform_set_drvdata(pdev, ss); + + switch (res->flags & IORESOURCE_MEM_TYPE_MASK) { + case IORESOURCE_MEM_8BIT: + ss->width = 8; + break; + case IORESOURCE_MEM_32BIT: + ss->width = 32; + break; + default: + dev_err(&pdev->dev, "No support width\n"); + return -ENODEV; + } + ss->irq = irq; + ss->master = master; + ss->addr = devm_ioremap(&pdev->dev, res->start, resource_size(res)); + if (ss->addr == NULL) { + dev_err(&pdev->dev, "ioremap error.\n"); + return -ENOMEM; + } + INIT_LIST_HEAD(&ss->queue); + spin_lock_init(&ss->lock); + INIT_WORK(&ss->ws, spi_sh_work); + init_waitqueue_head(&ss->wait); + + ret = request_irq(irq, spi_sh_irq, 0, "spi_sh", ss); + if (ret < 0) { + dev_err(&pdev->dev, "request_irq error\n"); + return ret; + } + + master->num_chipselect = 2; + master->bus_num = pdev->id; + master->setup = spi_sh_setup; + master->transfer = spi_sh_transfer; + master->cleanup = spi_sh_cleanup; + + ret = spi_register_master(master); + if (ret < 0) { + printk(KERN_ERR "spi_register_master error.\n"); + goto error3; + } + + return 0; + + error3: + free_irq(irq, ss); + return ret; +} + +static struct platform_driver spi_sh_driver = { + .probe = spi_sh_probe, + .remove = spi_sh_remove, + .driver = { + .name = "sh_spi", + }, +}; +module_platform_driver(spi_sh_driver); + +MODULE_DESCRIPTION("SH SPI bus driver"); +MODULE_LICENSE("GPL v2"); +MODULE_AUTHOR("Yoshihiro Shimoda"); +MODULE_ALIAS("platform:sh_spi"); diff --git a/drivers/spi/spi-sifive.c b/drivers/spi/spi-sifive.c new file mode 100644 index 000000000..f7c1e2043 --- /dev/null +++ b/drivers/spi/spi-sifive.c @@ -0,0 +1,448 @@ +// SPDX-License-Identifier: GPL-2.0 +// +// Copyright 2018 SiFive, Inc. +// +// SiFive SPI controller driver (master mode only) +// +// Author: SiFive, Inc. +// sifive@sifive.com + +#include <linux/clk.h> +#include <linux/module.h> +#include <linux/interrupt.h> +#include <linux/of.h> +#include <linux/platform_device.h> +#include <linux/spi/spi.h> +#include <linux/io.h> +#include <linux/log2.h> + +#define SIFIVE_SPI_DRIVER_NAME "sifive_spi" + +#define SIFIVE_SPI_MAX_CS 32 +#define SIFIVE_SPI_DEFAULT_DEPTH 8 +#define SIFIVE_SPI_DEFAULT_MAX_BITS 8 + +/* register offsets */ +#define SIFIVE_SPI_REG_SCKDIV 0x00 /* Serial clock divisor */ +#define SIFIVE_SPI_REG_SCKMODE 0x04 /* Serial clock mode */ +#define SIFIVE_SPI_REG_CSID 0x10 /* Chip select ID */ +#define SIFIVE_SPI_REG_CSDEF 0x14 /* Chip select default */ +#define SIFIVE_SPI_REG_CSMODE 0x18 /* Chip select mode */ +#define SIFIVE_SPI_REG_DELAY0 0x28 /* Delay control 0 */ +#define SIFIVE_SPI_REG_DELAY1 0x2c /* Delay control 1 */ +#define SIFIVE_SPI_REG_FMT 0x40 /* Frame format */ +#define SIFIVE_SPI_REG_TXDATA 0x48 /* Tx FIFO data */ +#define SIFIVE_SPI_REG_RXDATA 0x4c /* Rx FIFO data */ +#define SIFIVE_SPI_REG_TXMARK 0x50 /* Tx FIFO watermark */ +#define SIFIVE_SPI_REG_RXMARK 0x54 /* Rx FIFO watermark */ +#define SIFIVE_SPI_REG_FCTRL 0x60 /* SPI flash interface control */ +#define SIFIVE_SPI_REG_FFMT 0x64 /* SPI flash instruction format */ +#define SIFIVE_SPI_REG_IE 0x70 /* Interrupt Enable Register */ +#define SIFIVE_SPI_REG_IP 0x74 /* Interrupt Pendings Register */ + +/* sckdiv bits */ +#define SIFIVE_SPI_SCKDIV_DIV_MASK 0xfffU + +/* sckmode bits */ +#define SIFIVE_SPI_SCKMODE_PHA BIT(0) +#define SIFIVE_SPI_SCKMODE_POL BIT(1) +#define SIFIVE_SPI_SCKMODE_MODE_MASK (SIFIVE_SPI_SCKMODE_PHA | \ + SIFIVE_SPI_SCKMODE_POL) + +/* csmode bits */ +#define SIFIVE_SPI_CSMODE_MODE_AUTO 0U +#define SIFIVE_SPI_CSMODE_MODE_HOLD 2U +#define SIFIVE_SPI_CSMODE_MODE_OFF 3U + +/* delay0 bits */ +#define SIFIVE_SPI_DELAY0_CSSCK(x) ((u32)(x)) +#define SIFIVE_SPI_DELAY0_CSSCK_MASK 0xffU +#define SIFIVE_SPI_DELAY0_SCKCS(x) ((u32)(x) << 16) +#define SIFIVE_SPI_DELAY0_SCKCS_MASK (0xffU << 16) + +/* delay1 bits */ +#define SIFIVE_SPI_DELAY1_INTERCS(x) ((u32)(x)) +#define SIFIVE_SPI_DELAY1_INTERCS_MASK 0xffU +#define SIFIVE_SPI_DELAY1_INTERXFR(x) ((u32)(x) << 16) +#define SIFIVE_SPI_DELAY1_INTERXFR_MASK (0xffU << 16) + +/* fmt bits */ +#define SIFIVE_SPI_FMT_PROTO_SINGLE 0U +#define SIFIVE_SPI_FMT_PROTO_DUAL 1U +#define SIFIVE_SPI_FMT_PROTO_QUAD 2U +#define SIFIVE_SPI_FMT_PROTO_MASK 3U +#define SIFIVE_SPI_FMT_ENDIAN BIT(2) +#define SIFIVE_SPI_FMT_DIR BIT(3) +#define SIFIVE_SPI_FMT_LEN(x) ((u32)(x) << 16) +#define SIFIVE_SPI_FMT_LEN_MASK (0xfU << 16) + +/* txdata bits */ +#define SIFIVE_SPI_TXDATA_DATA_MASK 0xffU +#define SIFIVE_SPI_TXDATA_FULL BIT(31) + +/* rxdata bits */ +#define SIFIVE_SPI_RXDATA_DATA_MASK 0xffU +#define SIFIVE_SPI_RXDATA_EMPTY BIT(31) + +/* ie and ip bits */ +#define SIFIVE_SPI_IP_TXWM BIT(0) +#define SIFIVE_SPI_IP_RXWM BIT(1) + +struct sifive_spi { + void __iomem *regs; /* virt. address of control registers */ + struct clk *clk; /* bus clock */ + unsigned int fifo_depth; /* fifo depth in words */ + u32 cs_inactive; /* level of the CS pins when inactive */ + struct completion done; /* wake-up from interrupt */ +}; + +static void sifive_spi_write(struct sifive_spi *spi, int offset, u32 value) +{ + iowrite32(value, spi->regs + offset); +} + +static u32 sifive_spi_read(struct sifive_spi *spi, int offset) +{ + return ioread32(spi->regs + offset); +} + +static void sifive_spi_init(struct sifive_spi *spi) +{ + /* Watermark interrupts are disabled by default */ + sifive_spi_write(spi, SIFIVE_SPI_REG_IE, 0); + + /* Default watermark FIFO threshold values */ + sifive_spi_write(spi, SIFIVE_SPI_REG_TXMARK, 1); + sifive_spi_write(spi, SIFIVE_SPI_REG_RXMARK, 0); + + /* Set CS/SCK Delays and Inactive Time to defaults */ + sifive_spi_write(spi, SIFIVE_SPI_REG_DELAY0, + SIFIVE_SPI_DELAY0_CSSCK(1) | + SIFIVE_SPI_DELAY0_SCKCS(1)); + sifive_spi_write(spi, SIFIVE_SPI_REG_DELAY1, + SIFIVE_SPI_DELAY1_INTERCS(1) | + SIFIVE_SPI_DELAY1_INTERXFR(0)); + + /* Exit specialized memory-mapped SPI flash mode */ + sifive_spi_write(spi, SIFIVE_SPI_REG_FCTRL, 0); +} + +static int +sifive_spi_prepare_message(struct spi_master *master, struct spi_message *msg) +{ + struct sifive_spi *spi = spi_master_get_devdata(master); + struct spi_device *device = msg->spi; + + /* Update the chip select polarity */ + if (device->mode & SPI_CS_HIGH) + spi->cs_inactive &= ~BIT(device->chip_select); + else + spi->cs_inactive |= BIT(device->chip_select); + sifive_spi_write(spi, SIFIVE_SPI_REG_CSDEF, spi->cs_inactive); + + /* Select the correct device */ + sifive_spi_write(spi, SIFIVE_SPI_REG_CSID, device->chip_select); + + /* Set clock mode */ + sifive_spi_write(spi, SIFIVE_SPI_REG_SCKMODE, + device->mode & SIFIVE_SPI_SCKMODE_MODE_MASK); + + return 0; +} + +static void sifive_spi_set_cs(struct spi_device *device, bool is_high) +{ + struct sifive_spi *spi = spi_master_get_devdata(device->master); + + /* Reverse polarity is handled by SCMR/CPOL. Not inverted CS. */ + if (device->mode & SPI_CS_HIGH) + is_high = !is_high; + + sifive_spi_write(spi, SIFIVE_SPI_REG_CSMODE, is_high ? + SIFIVE_SPI_CSMODE_MODE_AUTO : + SIFIVE_SPI_CSMODE_MODE_HOLD); +} + +static int +sifive_spi_prep_transfer(struct sifive_spi *spi, struct spi_device *device, + struct spi_transfer *t) +{ + u32 cr; + unsigned int mode; + + /* Calculate and program the clock rate */ + cr = DIV_ROUND_UP(clk_get_rate(spi->clk) >> 1, t->speed_hz) - 1; + cr &= SIFIVE_SPI_SCKDIV_DIV_MASK; + sifive_spi_write(spi, SIFIVE_SPI_REG_SCKDIV, cr); + + mode = max_t(unsigned int, t->rx_nbits, t->tx_nbits); + + /* Set frame format */ + cr = SIFIVE_SPI_FMT_LEN(t->bits_per_word); + switch (mode) { + case SPI_NBITS_QUAD: + cr |= SIFIVE_SPI_FMT_PROTO_QUAD; + break; + case SPI_NBITS_DUAL: + cr |= SIFIVE_SPI_FMT_PROTO_DUAL; + break; + default: + cr |= SIFIVE_SPI_FMT_PROTO_SINGLE; + break; + } + if (device->mode & SPI_LSB_FIRST) + cr |= SIFIVE_SPI_FMT_ENDIAN; + if (!t->rx_buf) + cr |= SIFIVE_SPI_FMT_DIR; + sifive_spi_write(spi, SIFIVE_SPI_REG_FMT, cr); + + /* We will want to poll if the time we need to wait is + * less than the context switching time. + * Let's call that threshold 5us. The operation will take: + * (8/mode) * fifo_depth / hz <= 5 * 10^-6 + * 1600000 * fifo_depth <= hz * mode + */ + return 1600000 * spi->fifo_depth <= t->speed_hz * mode; +} + +static irqreturn_t sifive_spi_irq(int irq, void *dev_id) +{ + struct sifive_spi *spi = dev_id; + u32 ip = sifive_spi_read(spi, SIFIVE_SPI_REG_IP); + + if (ip & (SIFIVE_SPI_IP_TXWM | SIFIVE_SPI_IP_RXWM)) { + /* Disable interrupts until next transfer */ + sifive_spi_write(spi, SIFIVE_SPI_REG_IE, 0); + complete(&spi->done); + return IRQ_HANDLED; + } + + return IRQ_NONE; +} + +static void sifive_spi_wait(struct sifive_spi *spi, u32 bit, int poll) +{ + if (poll) { + u32 cr; + + do { + cr = sifive_spi_read(spi, SIFIVE_SPI_REG_IP); + } while (!(cr & bit)); + } else { + reinit_completion(&spi->done); + sifive_spi_write(spi, SIFIVE_SPI_REG_IE, bit); + wait_for_completion(&spi->done); + } +} + +static void sifive_spi_tx(struct sifive_spi *spi, const u8 *tx_ptr) +{ + WARN_ON_ONCE((sifive_spi_read(spi, SIFIVE_SPI_REG_TXDATA) + & SIFIVE_SPI_TXDATA_FULL) != 0); + sifive_spi_write(spi, SIFIVE_SPI_REG_TXDATA, + *tx_ptr & SIFIVE_SPI_TXDATA_DATA_MASK); +} + +static void sifive_spi_rx(struct sifive_spi *spi, u8 *rx_ptr) +{ + u32 data = sifive_spi_read(spi, SIFIVE_SPI_REG_RXDATA); + + WARN_ON_ONCE((data & SIFIVE_SPI_RXDATA_EMPTY) != 0); + *rx_ptr = data & SIFIVE_SPI_RXDATA_DATA_MASK; +} + +static int +sifive_spi_transfer_one(struct spi_master *master, struct spi_device *device, + struct spi_transfer *t) +{ + struct sifive_spi *spi = spi_master_get_devdata(master); + int poll = sifive_spi_prep_transfer(spi, device, t); + const u8 *tx_ptr = t->tx_buf; + u8 *rx_ptr = t->rx_buf; + unsigned int remaining_words = t->len; + + while (remaining_words) { + unsigned int n_words = min(remaining_words, spi->fifo_depth); + unsigned int i; + + /* Enqueue n_words for transmission */ + for (i = 0; i < n_words; i++) + sifive_spi_tx(spi, tx_ptr++); + + if (rx_ptr) { + /* Wait for transmission + reception to complete */ + sifive_spi_write(spi, SIFIVE_SPI_REG_RXMARK, + n_words - 1); + sifive_spi_wait(spi, SIFIVE_SPI_IP_RXWM, poll); + + /* Read out all the data from the RX FIFO */ + for (i = 0; i < n_words; i++) + sifive_spi_rx(spi, rx_ptr++); + } else { + /* Wait for transmission to complete */ + sifive_spi_wait(spi, SIFIVE_SPI_IP_TXWM, poll); + } + + remaining_words -= n_words; + } + + return 0; +} + +static int sifive_spi_probe(struct platform_device *pdev) +{ + struct sifive_spi *spi; + int ret, irq, num_cs; + u32 cs_bits, max_bits_per_word; + struct spi_master *master; + + master = spi_alloc_master(&pdev->dev, sizeof(struct sifive_spi)); + if (!master) { + dev_err(&pdev->dev, "out of memory\n"); + return -ENOMEM; + } + + spi = spi_master_get_devdata(master); + init_completion(&spi->done); + platform_set_drvdata(pdev, master); + + spi->regs = devm_platform_ioremap_resource(pdev, 0); + if (IS_ERR(spi->regs)) { + ret = PTR_ERR(spi->regs); + goto put_master; + } + + spi->clk = devm_clk_get(&pdev->dev, NULL); + if (IS_ERR(spi->clk)) { + dev_err(&pdev->dev, "Unable to find bus clock\n"); + ret = PTR_ERR(spi->clk); + goto put_master; + } + + irq = platform_get_irq(pdev, 0); + if (irq < 0) { + ret = irq; + goto put_master; + } + + /* Optional parameters */ + ret = + of_property_read_u32(pdev->dev.of_node, "sifive,fifo-depth", + &spi->fifo_depth); + if (ret < 0) + spi->fifo_depth = SIFIVE_SPI_DEFAULT_DEPTH; + + ret = + of_property_read_u32(pdev->dev.of_node, "sifive,max-bits-per-word", + &max_bits_per_word); + + if (!ret && max_bits_per_word < 8) { + dev_err(&pdev->dev, "Only 8bit SPI words supported by the driver\n"); + ret = -EINVAL; + goto put_master; + } + + /* Spin up the bus clock before hitting registers */ + ret = clk_prepare_enable(spi->clk); + if (ret) { + dev_err(&pdev->dev, "Unable to enable bus clock\n"); + goto put_master; + } + + /* probe the number of CS lines */ + spi->cs_inactive = sifive_spi_read(spi, SIFIVE_SPI_REG_CSDEF); + sifive_spi_write(spi, SIFIVE_SPI_REG_CSDEF, 0xffffffffU); + cs_bits = sifive_spi_read(spi, SIFIVE_SPI_REG_CSDEF); + sifive_spi_write(spi, SIFIVE_SPI_REG_CSDEF, spi->cs_inactive); + if (!cs_bits) { + dev_err(&pdev->dev, "Could not auto probe CS lines\n"); + ret = -EINVAL; + goto disable_clk; + } + + num_cs = ilog2(cs_bits) + 1; + if (num_cs > SIFIVE_SPI_MAX_CS) { + dev_err(&pdev->dev, "Invalid number of spi slaves\n"); + ret = -EINVAL; + goto disable_clk; + } + + /* Define our master */ + master->dev.of_node = pdev->dev.of_node; + master->bus_num = pdev->id; + master->num_chipselect = num_cs; + master->mode_bits = SPI_CPHA | SPI_CPOL + | SPI_CS_HIGH | SPI_LSB_FIRST + | SPI_TX_DUAL | SPI_TX_QUAD + | SPI_RX_DUAL | SPI_RX_QUAD; + /* TODO: add driver support for bits_per_word < 8 + * we need to "left-align" the bits (unless SPI_LSB_FIRST) + */ + master->bits_per_word_mask = SPI_BPW_MASK(8); + master->flags = SPI_CONTROLLER_MUST_TX | SPI_MASTER_GPIO_SS; + master->prepare_message = sifive_spi_prepare_message; + master->set_cs = sifive_spi_set_cs; + master->transfer_one = sifive_spi_transfer_one; + + pdev->dev.dma_mask = NULL; + /* Configure the SPI master hardware */ + sifive_spi_init(spi); + + /* Register for SPI Interrupt */ + ret = devm_request_irq(&pdev->dev, irq, sifive_spi_irq, 0, + dev_name(&pdev->dev), spi); + if (ret) { + dev_err(&pdev->dev, "Unable to bind to interrupt\n"); + goto disable_clk; + } + + dev_info(&pdev->dev, "mapped; irq=%d, cs=%d\n", + irq, master->num_chipselect); + + ret = devm_spi_register_master(&pdev->dev, master); + if (ret < 0) { + dev_err(&pdev->dev, "spi_register_master failed\n"); + goto disable_clk; + } + + return 0; + +disable_clk: + clk_disable_unprepare(spi->clk); +put_master: + spi_master_put(master); + + return ret; +} + +static int sifive_spi_remove(struct platform_device *pdev) +{ + struct spi_master *master = platform_get_drvdata(pdev); + struct sifive_spi *spi = spi_master_get_devdata(master); + + /* Disable all the interrupts just in case */ + sifive_spi_write(spi, SIFIVE_SPI_REG_IE, 0); + clk_disable_unprepare(spi->clk); + + return 0; +} + +static const struct of_device_id sifive_spi_of_match[] = { + { .compatible = "sifive,spi0", }, + {} +}; +MODULE_DEVICE_TABLE(of, sifive_spi_of_match); + +static struct platform_driver sifive_spi_driver = { + .probe = sifive_spi_probe, + .remove = sifive_spi_remove, + .driver = { + .name = SIFIVE_SPI_DRIVER_NAME, + .of_match_table = sifive_spi_of_match, + }, +}; +module_platform_driver(sifive_spi_driver); + +MODULE_AUTHOR("SiFive, Inc. <sifive@sifive.com>"); +MODULE_DESCRIPTION("SiFive SPI driver"); +MODULE_LICENSE("GPL"); diff --git a/drivers/spi/spi-sirf.c b/drivers/spi/spi-sirf.c new file mode 100644 index 000000000..8419e6722 --- /dev/null +++ b/drivers/spi/spi-sirf.c @@ -0,0 +1,1236 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * SPI bus driver for CSR SiRFprimaII + * + * Copyright (c) 2011 Cambridge Silicon Radio Limited, a CSR plc group company. + */ + +#include <linux/module.h> +#include <linux/kernel.h> +#include <linux/slab.h> +#include <linux/clk.h> +#include <linux/completion.h> +#include <linux/interrupt.h> +#include <linux/io.h> +#include <linux/of.h> +#include <linux/bitops.h> +#include <linux/err.h> +#include <linux/platform_device.h> +#include <linux/of_gpio.h> +#include <linux/spi/spi.h> +#include <linux/spi/spi_bitbang.h> +#include <linux/dmaengine.h> +#include <linux/dma-direction.h> +#include <linux/dma-mapping.h> +#include <linux/reset.h> + +#define DRIVER_NAME "sirfsoc_spi" +/* SPI CTRL register defines */ +#define SIRFSOC_SPI_SLV_MODE BIT(16) +#define SIRFSOC_SPI_CMD_MODE BIT(17) +#define SIRFSOC_SPI_CS_IO_OUT BIT(18) +#define SIRFSOC_SPI_CS_IO_MODE BIT(19) +#define SIRFSOC_SPI_CLK_IDLE_STAT BIT(20) +#define SIRFSOC_SPI_CS_IDLE_STAT BIT(21) +#define SIRFSOC_SPI_TRAN_MSB BIT(22) +#define SIRFSOC_SPI_DRV_POS_EDGE BIT(23) +#define SIRFSOC_SPI_CS_HOLD_TIME BIT(24) +#define SIRFSOC_SPI_CLK_SAMPLE_MODE BIT(25) +#define SIRFSOC_SPI_TRAN_DAT_FORMAT_8 (0 << 26) +#define SIRFSOC_SPI_TRAN_DAT_FORMAT_12 (1 << 26) +#define SIRFSOC_SPI_TRAN_DAT_FORMAT_16 (2 << 26) +#define SIRFSOC_SPI_TRAN_DAT_FORMAT_32 (3 << 26) +#define SIRFSOC_SPI_CMD_BYTE_NUM(x) ((x & 3) << 28) +#define SIRFSOC_SPI_ENA_AUTO_CLR BIT(30) +#define SIRFSOC_SPI_MUL_DAT_MODE BIT(31) + +/* Interrupt Enable */ +#define SIRFSOC_SPI_RX_DONE_INT_EN BIT(0) +#define SIRFSOC_SPI_TX_DONE_INT_EN BIT(1) +#define SIRFSOC_SPI_RX_OFLOW_INT_EN BIT(2) +#define SIRFSOC_SPI_TX_UFLOW_INT_EN BIT(3) +#define SIRFSOC_SPI_RX_IO_DMA_INT_EN BIT(4) +#define SIRFSOC_SPI_TX_IO_DMA_INT_EN BIT(5) +#define SIRFSOC_SPI_RXFIFO_FULL_INT_EN BIT(6) +#define SIRFSOC_SPI_TXFIFO_EMPTY_INT_EN BIT(7) +#define SIRFSOC_SPI_RXFIFO_THD_INT_EN BIT(8) +#define SIRFSOC_SPI_TXFIFO_THD_INT_EN BIT(9) +#define SIRFSOC_SPI_FRM_END_INT_EN BIT(10) + +/* Interrupt status */ +#define SIRFSOC_SPI_RX_DONE BIT(0) +#define SIRFSOC_SPI_TX_DONE BIT(1) +#define SIRFSOC_SPI_RX_OFLOW BIT(2) +#define SIRFSOC_SPI_TX_UFLOW BIT(3) +#define SIRFSOC_SPI_RX_IO_DMA BIT(4) +#define SIRFSOC_SPI_RX_FIFO_FULL BIT(6) +#define SIRFSOC_SPI_TXFIFO_EMPTY BIT(7) +#define SIRFSOC_SPI_RXFIFO_THD_REACH BIT(8) +#define SIRFSOC_SPI_TXFIFO_THD_REACH BIT(9) +#define SIRFSOC_SPI_FRM_END BIT(10) + +/* TX RX enable */ +#define SIRFSOC_SPI_RX_EN BIT(0) +#define SIRFSOC_SPI_TX_EN BIT(1) +#define SIRFSOC_SPI_CMD_TX_EN BIT(2) + +#define SIRFSOC_SPI_IO_MODE_SEL BIT(0) +#define SIRFSOC_SPI_RX_DMA_FLUSH BIT(2) + +/* FIFO OPs */ +#define SIRFSOC_SPI_FIFO_RESET BIT(0) +#define SIRFSOC_SPI_FIFO_START BIT(1) + +/* FIFO CTRL */ +#define SIRFSOC_SPI_FIFO_WIDTH_BYTE (0 << 0) +#define SIRFSOC_SPI_FIFO_WIDTH_WORD (1 << 0) +#define SIRFSOC_SPI_FIFO_WIDTH_DWORD (2 << 0) +/* USP related */ +#define SIRFSOC_USP_SYNC_MODE BIT(0) +#define SIRFSOC_USP_SLV_MODE BIT(1) +#define SIRFSOC_USP_LSB BIT(4) +#define SIRFSOC_USP_EN BIT(5) +#define SIRFSOC_USP_RXD_FALLING_EDGE BIT(6) +#define SIRFSOC_USP_TXD_FALLING_EDGE BIT(7) +#define SIRFSOC_USP_CS_HIGH_VALID BIT(9) +#define SIRFSOC_USP_SCLK_IDLE_STAT BIT(11) +#define SIRFSOC_USP_TFS_IO_MODE BIT(14) +#define SIRFSOC_USP_TFS_IO_INPUT BIT(19) + +#define SIRFSOC_USP_RXD_DELAY_LEN_MASK 0xFF +#define SIRFSOC_USP_TXD_DELAY_LEN_MASK 0xFF +#define SIRFSOC_USP_RXD_DELAY_OFFSET 0 +#define SIRFSOC_USP_TXD_DELAY_OFFSET 8 +#define SIRFSOC_USP_RXD_DELAY_LEN 1 +#define SIRFSOC_USP_TXD_DELAY_LEN 1 +#define SIRFSOC_USP_CLK_DIVISOR_OFFSET 21 +#define SIRFSOC_USP_CLK_DIVISOR_MASK 0x3FF +#define SIRFSOC_USP_CLK_10_11_MASK 0x3 +#define SIRFSOC_USP_CLK_10_11_OFFSET 30 +#define SIRFSOC_USP_CLK_12_15_MASK 0xF +#define SIRFSOC_USP_CLK_12_15_OFFSET 24 + +#define SIRFSOC_USP_TX_DATA_OFFSET 0 +#define SIRFSOC_USP_TX_SYNC_OFFSET 8 +#define SIRFSOC_USP_TX_FRAME_OFFSET 16 +#define SIRFSOC_USP_TX_SHIFTER_OFFSET 24 + +#define SIRFSOC_USP_TX_DATA_MASK 0xFF +#define SIRFSOC_USP_TX_SYNC_MASK 0xFF +#define SIRFSOC_USP_TX_FRAME_MASK 0xFF +#define SIRFSOC_USP_TX_SHIFTER_MASK 0x1F + +#define SIRFSOC_USP_RX_DATA_OFFSET 0 +#define SIRFSOC_USP_RX_FRAME_OFFSET 8 +#define SIRFSOC_USP_RX_SHIFTER_OFFSET 16 + +#define SIRFSOC_USP_RX_DATA_MASK 0xFF +#define SIRFSOC_USP_RX_FRAME_MASK 0xFF +#define SIRFSOC_USP_RX_SHIFTER_MASK 0x1F +#define SIRFSOC_USP_CS_HIGH_VALUE BIT(1) + +#define SIRFSOC_SPI_FIFO_SC_OFFSET 0 +#define SIRFSOC_SPI_FIFO_LC_OFFSET 10 +#define SIRFSOC_SPI_FIFO_HC_OFFSET 20 + +#define SIRFSOC_SPI_FIFO_FULL_MASK(s) (1 << ((s)->fifo_full_offset)) +#define SIRFSOC_SPI_FIFO_EMPTY_MASK(s) (1 << ((s)->fifo_full_offset + 1)) +#define SIRFSOC_SPI_FIFO_THD_MASK(s) ((s)->fifo_size - 1) +#define SIRFSOC_SPI_FIFO_THD_OFFSET 2 +#define SIRFSOC_SPI_FIFO_LEVEL_CHK_MASK(s, val) \ + ((val) & (s)->fifo_level_chk_mask) + +enum sirf_spi_type { + SIRF_REAL_SPI, + SIRF_USP_SPI_P2, + SIRF_USP_SPI_A7, +}; + +/* + * only if the rx/tx buffer and transfer size are 4-bytes aligned, we use dma + * due to the limitation of dma controller + */ + +#define ALIGNED(x) (!((u32)x & 0x3)) +#define IS_DMA_VALID(x) (x && ALIGNED(x->tx_buf) && ALIGNED(x->rx_buf) && \ + ALIGNED(x->len) && (x->len < 2 * PAGE_SIZE)) + +#define SIRFSOC_MAX_CMD_BYTES 4 +#define SIRFSOC_SPI_DEFAULT_FRQ 1000000 + +struct sirf_spi_register { + /*SPI and USP-SPI common*/ + u32 tx_rx_en; + u32 int_en; + u32 int_st; + u32 tx_dma_io_ctrl; + u32 tx_dma_io_len; + u32 txfifo_ctrl; + u32 txfifo_level_chk; + u32 txfifo_op; + u32 txfifo_st; + u32 txfifo_data; + u32 rx_dma_io_ctrl; + u32 rx_dma_io_len; + u32 rxfifo_ctrl; + u32 rxfifo_level_chk; + u32 rxfifo_op; + u32 rxfifo_st; + u32 rxfifo_data; + /*SPI self*/ + u32 spi_ctrl; + u32 spi_cmd; + u32 spi_dummy_delay_ctrl; + /*USP-SPI self*/ + u32 usp_mode1; + u32 usp_mode2; + u32 usp_tx_frame_ctrl; + u32 usp_rx_frame_ctrl; + u32 usp_pin_io_data; + u32 usp_risc_dsp_mode; + u32 usp_async_param_reg; + u32 usp_irda_x_mode_div; + u32 usp_sm_cfg; + u32 usp_int_en_clr; +}; + +static const struct sirf_spi_register real_spi_register = { + .tx_rx_en = 0x8, + .int_en = 0xc, + .int_st = 0x10, + .tx_dma_io_ctrl = 0x100, + .tx_dma_io_len = 0x104, + .txfifo_ctrl = 0x108, + .txfifo_level_chk = 0x10c, + .txfifo_op = 0x110, + .txfifo_st = 0x114, + .txfifo_data = 0x118, + .rx_dma_io_ctrl = 0x120, + .rx_dma_io_len = 0x124, + .rxfifo_ctrl = 0x128, + .rxfifo_level_chk = 0x12c, + .rxfifo_op = 0x130, + .rxfifo_st = 0x134, + .rxfifo_data = 0x138, + .spi_ctrl = 0x0, + .spi_cmd = 0x4, + .spi_dummy_delay_ctrl = 0x144, +}; + +static const struct sirf_spi_register usp_spi_register = { + .tx_rx_en = 0x10, + .int_en = 0x14, + .int_st = 0x18, + .tx_dma_io_ctrl = 0x100, + .tx_dma_io_len = 0x104, + .txfifo_ctrl = 0x108, + .txfifo_level_chk = 0x10c, + .txfifo_op = 0x110, + .txfifo_st = 0x114, + .txfifo_data = 0x118, + .rx_dma_io_ctrl = 0x120, + .rx_dma_io_len = 0x124, + .rxfifo_ctrl = 0x128, + .rxfifo_level_chk = 0x12c, + .rxfifo_op = 0x130, + .rxfifo_st = 0x134, + .rxfifo_data = 0x138, + .usp_mode1 = 0x0, + .usp_mode2 = 0x4, + .usp_tx_frame_ctrl = 0x8, + .usp_rx_frame_ctrl = 0xc, + .usp_pin_io_data = 0x1c, + .usp_risc_dsp_mode = 0x20, + .usp_async_param_reg = 0x24, + .usp_irda_x_mode_div = 0x28, + .usp_sm_cfg = 0x2c, + .usp_int_en_clr = 0x140, +}; + +struct sirfsoc_spi { + struct spi_bitbang bitbang; + struct completion rx_done; + struct completion tx_done; + + void __iomem *base; + u32 ctrl_freq; /* SPI controller clock speed */ + struct clk *clk; + + /* rx & tx bufs from the spi_transfer */ + const void *tx; + void *rx; + + /* place received word into rx buffer */ + void (*rx_word) (struct sirfsoc_spi *); + /* get word from tx buffer for sending */ + void (*tx_word) (struct sirfsoc_spi *); + + /* number of words left to be tranmitted/received */ + unsigned int left_tx_word; + unsigned int left_rx_word; + + /* rx & tx DMA channels */ + struct dma_chan *rx_chan; + struct dma_chan *tx_chan; + dma_addr_t src_start; + dma_addr_t dst_start; + int word_width; /* in bytes */ + + /* + * if tx size is not more than 4 and rx size is NULL, use + * command model + */ + bool tx_by_cmd; + bool hw_cs; + enum sirf_spi_type type; + const struct sirf_spi_register *regs; + unsigned int fifo_size; + /* fifo empty offset is (fifo full offset + 1)*/ + unsigned int fifo_full_offset; + /* fifo_level_chk_mask is (fifo_size/4 - 1) */ + unsigned int fifo_level_chk_mask; + unsigned int dat_max_frm_len; +}; + +struct sirf_spi_comp_data { + const struct sirf_spi_register *regs; + enum sirf_spi_type type; + unsigned int dat_max_frm_len; + unsigned int fifo_size; + void (*hwinit)(struct sirfsoc_spi *sspi); +}; + +static void sirfsoc_usp_hwinit(struct sirfsoc_spi *sspi) +{ + /* reset USP and let USP can operate */ + writel(readl(sspi->base + sspi->regs->usp_mode1) & + ~SIRFSOC_USP_EN, sspi->base + sspi->regs->usp_mode1); + writel(readl(sspi->base + sspi->regs->usp_mode1) | + SIRFSOC_USP_EN, sspi->base + sspi->regs->usp_mode1); +} + +static void spi_sirfsoc_rx_word_u8(struct sirfsoc_spi *sspi) +{ + u32 data; + u8 *rx = sspi->rx; + + data = readl(sspi->base + sspi->regs->rxfifo_data); + + if (rx) { + *rx++ = (u8) data; + sspi->rx = rx; + } + + sspi->left_rx_word--; +} + +static void spi_sirfsoc_tx_word_u8(struct sirfsoc_spi *sspi) +{ + u32 data = 0; + const u8 *tx = sspi->tx; + + if (tx) { + data = *tx++; + sspi->tx = tx; + } + writel(data, sspi->base + sspi->regs->txfifo_data); + sspi->left_tx_word--; +} + +static void spi_sirfsoc_rx_word_u16(struct sirfsoc_spi *sspi) +{ + u32 data; + u16 *rx = sspi->rx; + + data = readl(sspi->base + sspi->regs->rxfifo_data); + + if (rx) { + *rx++ = (u16) data; + sspi->rx = rx; + } + + sspi->left_rx_word--; +} + +static void spi_sirfsoc_tx_word_u16(struct sirfsoc_spi *sspi) +{ + u32 data = 0; + const u16 *tx = sspi->tx; + + if (tx) { + data = *tx++; + sspi->tx = tx; + } + + writel(data, sspi->base + sspi->regs->txfifo_data); + sspi->left_tx_word--; +} + +static void spi_sirfsoc_rx_word_u32(struct sirfsoc_spi *sspi) +{ + u32 data; + u32 *rx = sspi->rx; + + data = readl(sspi->base + sspi->regs->rxfifo_data); + + if (rx) { + *rx++ = (u32) data; + sspi->rx = rx; + } + + sspi->left_rx_word--; + +} + +static void spi_sirfsoc_tx_word_u32(struct sirfsoc_spi *sspi) +{ + u32 data = 0; + const u32 *tx = sspi->tx; + + if (tx) { + data = *tx++; + sspi->tx = tx; + } + + writel(data, sspi->base + sspi->regs->txfifo_data); + sspi->left_tx_word--; +} + +static irqreturn_t spi_sirfsoc_irq(int irq, void *dev_id) +{ + struct sirfsoc_spi *sspi = dev_id; + u32 spi_stat; + + spi_stat = readl(sspi->base + sspi->regs->int_st); + if (sspi->tx_by_cmd && sspi->type == SIRF_REAL_SPI + && (spi_stat & SIRFSOC_SPI_FRM_END)) { + complete(&sspi->tx_done); + writel(0x0, sspi->base + sspi->regs->int_en); + writel(readl(sspi->base + sspi->regs->int_st), + sspi->base + sspi->regs->int_st); + return IRQ_HANDLED; + } + /* Error Conditions */ + if (spi_stat & SIRFSOC_SPI_RX_OFLOW || + spi_stat & SIRFSOC_SPI_TX_UFLOW) { + complete(&sspi->tx_done); + complete(&sspi->rx_done); + switch (sspi->type) { + case SIRF_REAL_SPI: + case SIRF_USP_SPI_P2: + writel(0x0, sspi->base + sspi->regs->int_en); + break; + case SIRF_USP_SPI_A7: + writel(~0UL, sspi->base + sspi->regs->usp_int_en_clr); + break; + } + writel(readl(sspi->base + sspi->regs->int_st), + sspi->base + sspi->regs->int_st); + return IRQ_HANDLED; + } + if (spi_stat & SIRFSOC_SPI_TXFIFO_EMPTY) + complete(&sspi->tx_done); + while (!(readl(sspi->base + sspi->regs->int_st) & + SIRFSOC_SPI_RX_IO_DMA)) + cpu_relax(); + complete(&sspi->rx_done); + switch (sspi->type) { + case SIRF_REAL_SPI: + case SIRF_USP_SPI_P2: + writel(0x0, sspi->base + sspi->regs->int_en); + break; + case SIRF_USP_SPI_A7: + writel(~0UL, sspi->base + sspi->regs->usp_int_en_clr); + break; + } + writel(readl(sspi->base + sspi->regs->int_st), + sspi->base + sspi->regs->int_st); + + return IRQ_HANDLED; +} + +static void spi_sirfsoc_dma_fini_callback(void *data) +{ + struct completion *dma_complete = data; + + complete(dma_complete); +} + +static void spi_sirfsoc_cmd_transfer(struct spi_device *spi, + struct spi_transfer *t) +{ + struct sirfsoc_spi *sspi; + int timeout = t->len * 10; + u32 cmd; + + sspi = spi_master_get_devdata(spi->master); + writel(SIRFSOC_SPI_FIFO_RESET, sspi->base + sspi->regs->txfifo_op); + writel(SIRFSOC_SPI_FIFO_START, sspi->base + sspi->regs->txfifo_op); + memcpy(&cmd, sspi->tx, t->len); + if (sspi->word_width == 1 && !(spi->mode & SPI_LSB_FIRST)) + cmd = cpu_to_be32(cmd) >> + ((SIRFSOC_MAX_CMD_BYTES - t->len) * 8); + if (sspi->word_width == 2 && t->len == 4 && + (!(spi->mode & SPI_LSB_FIRST))) + cmd = ((cmd & 0xffff) << 16) | (cmd >> 16); + writel(cmd, sspi->base + sspi->regs->spi_cmd); + writel(SIRFSOC_SPI_FRM_END_INT_EN, + sspi->base + sspi->regs->int_en); + writel(SIRFSOC_SPI_CMD_TX_EN, + sspi->base + sspi->regs->tx_rx_en); + if (wait_for_completion_timeout(&sspi->tx_done, timeout) == 0) { + dev_err(&spi->dev, "cmd transfer timeout\n"); + return; + } + sspi->left_rx_word -= t->len; +} + +static void spi_sirfsoc_dma_transfer(struct spi_device *spi, + struct spi_transfer *t) +{ + struct sirfsoc_spi *sspi; + struct dma_async_tx_descriptor *rx_desc, *tx_desc; + int timeout = t->len * 10; + + sspi = spi_master_get_devdata(spi->master); + writel(SIRFSOC_SPI_FIFO_RESET, sspi->base + sspi->regs->rxfifo_op); + writel(SIRFSOC_SPI_FIFO_RESET, sspi->base + sspi->regs->txfifo_op); + switch (sspi->type) { + case SIRF_REAL_SPI: + writel(SIRFSOC_SPI_FIFO_START, + sspi->base + sspi->regs->rxfifo_op); + writel(SIRFSOC_SPI_FIFO_START, + sspi->base + sspi->regs->txfifo_op); + writel(0, sspi->base + sspi->regs->int_en); + break; + case SIRF_USP_SPI_P2: + writel(0x0, sspi->base + sspi->regs->rxfifo_op); + writel(0x0, sspi->base + sspi->regs->txfifo_op); + writel(0, sspi->base + sspi->regs->int_en); + break; + case SIRF_USP_SPI_A7: + writel(0x0, sspi->base + sspi->regs->rxfifo_op); + writel(0x0, sspi->base + sspi->regs->txfifo_op); + writel(~0UL, sspi->base + sspi->regs->usp_int_en_clr); + break; + } + writel(readl(sspi->base + sspi->regs->int_st), + sspi->base + sspi->regs->int_st); + if (sspi->left_tx_word < sspi->dat_max_frm_len) { + switch (sspi->type) { + case SIRF_REAL_SPI: + writel(readl(sspi->base + sspi->regs->spi_ctrl) | + SIRFSOC_SPI_ENA_AUTO_CLR | + SIRFSOC_SPI_MUL_DAT_MODE, + sspi->base + sspi->regs->spi_ctrl); + writel(sspi->left_tx_word - 1, + sspi->base + sspi->regs->tx_dma_io_len); + writel(sspi->left_tx_word - 1, + sspi->base + sspi->regs->rx_dma_io_len); + break; + case SIRF_USP_SPI_P2: + case SIRF_USP_SPI_A7: + /*USP simulate SPI, tx/rx_dma_io_len indicates bytes*/ + writel(sspi->left_tx_word * sspi->word_width, + sspi->base + sspi->regs->tx_dma_io_len); + writel(sspi->left_tx_word * sspi->word_width, + sspi->base + sspi->regs->rx_dma_io_len); + break; + } + } else { + if (sspi->type == SIRF_REAL_SPI) + writel(readl(sspi->base + sspi->regs->spi_ctrl), + sspi->base + sspi->regs->spi_ctrl); + writel(0, sspi->base + sspi->regs->tx_dma_io_len); + writel(0, sspi->base + sspi->regs->rx_dma_io_len); + } + sspi->dst_start = dma_map_single(&spi->dev, sspi->rx, t->len, + (t->tx_buf != t->rx_buf) ? + DMA_FROM_DEVICE : DMA_BIDIRECTIONAL); + rx_desc = dmaengine_prep_slave_single(sspi->rx_chan, + sspi->dst_start, t->len, DMA_DEV_TO_MEM, + DMA_PREP_INTERRUPT | DMA_CTRL_ACK); + rx_desc->callback = spi_sirfsoc_dma_fini_callback; + rx_desc->callback_param = &sspi->rx_done; + + sspi->src_start = dma_map_single(&spi->dev, (void *)sspi->tx, t->len, + (t->tx_buf != t->rx_buf) ? + DMA_TO_DEVICE : DMA_BIDIRECTIONAL); + tx_desc = dmaengine_prep_slave_single(sspi->tx_chan, + sspi->src_start, t->len, DMA_MEM_TO_DEV, + DMA_PREP_INTERRUPT | DMA_CTRL_ACK); + tx_desc->callback = spi_sirfsoc_dma_fini_callback; + tx_desc->callback_param = &sspi->tx_done; + + dmaengine_submit(tx_desc); + dmaengine_submit(rx_desc); + dma_async_issue_pending(sspi->tx_chan); + dma_async_issue_pending(sspi->rx_chan); + writel(SIRFSOC_SPI_RX_EN | SIRFSOC_SPI_TX_EN, + sspi->base + sspi->regs->tx_rx_en); + if (sspi->type == SIRF_USP_SPI_P2 || + sspi->type == SIRF_USP_SPI_A7) { + writel(SIRFSOC_SPI_FIFO_START, + sspi->base + sspi->regs->rxfifo_op); + writel(SIRFSOC_SPI_FIFO_START, + sspi->base + sspi->regs->txfifo_op); + } + if (wait_for_completion_timeout(&sspi->rx_done, timeout) == 0) { + dev_err(&spi->dev, "transfer timeout\n"); + dmaengine_terminate_all(sspi->rx_chan); + } else + sspi->left_rx_word = 0; + /* + * we only wait tx-done event if transferring by DMA. for PIO, + * we get rx data by writing tx data, so if rx is done, tx has + * done earlier + */ + if (wait_for_completion_timeout(&sspi->tx_done, timeout) == 0) { + dev_err(&spi->dev, "transfer timeout\n"); + if (sspi->type == SIRF_USP_SPI_P2 || + sspi->type == SIRF_USP_SPI_A7) + writel(0, sspi->base + sspi->regs->tx_rx_en); + dmaengine_terminate_all(sspi->tx_chan); + } + dma_unmap_single(&spi->dev, sspi->src_start, t->len, DMA_TO_DEVICE); + dma_unmap_single(&spi->dev, sspi->dst_start, t->len, DMA_FROM_DEVICE); + /* TX, RX FIFO stop */ + writel(0, sspi->base + sspi->regs->rxfifo_op); + writel(0, sspi->base + sspi->regs->txfifo_op); + if (sspi->left_tx_word >= sspi->dat_max_frm_len) + writel(0, sspi->base + sspi->regs->tx_rx_en); + if (sspi->type == SIRF_USP_SPI_P2 || + sspi->type == SIRF_USP_SPI_A7) + writel(0, sspi->base + sspi->regs->tx_rx_en); +} + +static void spi_sirfsoc_pio_transfer(struct spi_device *spi, + struct spi_transfer *t) +{ + struct sirfsoc_spi *sspi; + int timeout = t->len * 10; + unsigned int data_units; + + sspi = spi_master_get_devdata(spi->master); + do { + writel(SIRFSOC_SPI_FIFO_RESET, + sspi->base + sspi->regs->rxfifo_op); + writel(SIRFSOC_SPI_FIFO_RESET, + sspi->base + sspi->regs->txfifo_op); + switch (sspi->type) { + case SIRF_USP_SPI_P2: + writel(0x0, sspi->base + sspi->regs->rxfifo_op); + writel(0x0, sspi->base + sspi->regs->txfifo_op); + writel(0, sspi->base + sspi->regs->int_en); + writel(readl(sspi->base + sspi->regs->int_st), + sspi->base + sspi->regs->int_st); + writel(min((sspi->left_tx_word * sspi->word_width), + sspi->fifo_size), + sspi->base + sspi->regs->tx_dma_io_len); + writel(min((sspi->left_rx_word * sspi->word_width), + sspi->fifo_size), + sspi->base + sspi->regs->rx_dma_io_len); + break; + case SIRF_USP_SPI_A7: + writel(0x0, sspi->base + sspi->regs->rxfifo_op); + writel(0x0, sspi->base + sspi->regs->txfifo_op); + writel(~0UL, sspi->base + sspi->regs->usp_int_en_clr); + writel(readl(sspi->base + sspi->regs->int_st), + sspi->base + sspi->regs->int_st); + writel(min((sspi->left_tx_word * sspi->word_width), + sspi->fifo_size), + sspi->base + sspi->regs->tx_dma_io_len); + writel(min((sspi->left_rx_word * sspi->word_width), + sspi->fifo_size), + sspi->base + sspi->regs->rx_dma_io_len); + break; + case SIRF_REAL_SPI: + writel(SIRFSOC_SPI_FIFO_START, + sspi->base + sspi->regs->rxfifo_op); + writel(SIRFSOC_SPI_FIFO_START, + sspi->base + sspi->regs->txfifo_op); + writel(0, sspi->base + sspi->regs->int_en); + writel(readl(sspi->base + sspi->regs->int_st), + sspi->base + sspi->regs->int_st); + writel(readl(sspi->base + sspi->regs->spi_ctrl) | + SIRFSOC_SPI_MUL_DAT_MODE | + SIRFSOC_SPI_ENA_AUTO_CLR, + sspi->base + sspi->regs->spi_ctrl); + data_units = sspi->fifo_size / sspi->word_width; + writel(min(sspi->left_tx_word, data_units) - 1, + sspi->base + sspi->regs->tx_dma_io_len); + writel(min(sspi->left_rx_word, data_units) - 1, + sspi->base + sspi->regs->rx_dma_io_len); + break; + } + while (!((readl(sspi->base + sspi->regs->txfifo_st) + & SIRFSOC_SPI_FIFO_FULL_MASK(sspi))) && + sspi->left_tx_word) + sspi->tx_word(sspi); + writel(SIRFSOC_SPI_TXFIFO_EMPTY_INT_EN | + SIRFSOC_SPI_TX_UFLOW_INT_EN | + SIRFSOC_SPI_RX_OFLOW_INT_EN | + SIRFSOC_SPI_RX_IO_DMA_INT_EN, + sspi->base + sspi->regs->int_en); + writel(SIRFSOC_SPI_RX_EN | SIRFSOC_SPI_TX_EN, + sspi->base + sspi->regs->tx_rx_en); + if (sspi->type == SIRF_USP_SPI_P2 || + sspi->type == SIRF_USP_SPI_A7) { + writel(SIRFSOC_SPI_FIFO_START, + sspi->base + sspi->regs->rxfifo_op); + writel(SIRFSOC_SPI_FIFO_START, + sspi->base + sspi->regs->txfifo_op); + } + if (!wait_for_completion_timeout(&sspi->tx_done, timeout) || + !wait_for_completion_timeout(&sspi->rx_done, timeout)) { + dev_err(&spi->dev, "transfer timeout\n"); + if (sspi->type == SIRF_USP_SPI_P2 || + sspi->type == SIRF_USP_SPI_A7) + writel(0, sspi->base + sspi->regs->tx_rx_en); + break; + } + while (!((readl(sspi->base + sspi->regs->rxfifo_st) + & SIRFSOC_SPI_FIFO_EMPTY_MASK(sspi))) && + sspi->left_rx_word) + sspi->rx_word(sspi); + if (sspi->type == SIRF_USP_SPI_P2 || + sspi->type == SIRF_USP_SPI_A7) + writel(0, sspi->base + sspi->regs->tx_rx_en); + writel(0, sspi->base + sspi->regs->rxfifo_op); + writel(0, sspi->base + sspi->regs->txfifo_op); + } while (sspi->left_tx_word != 0 || sspi->left_rx_word != 0); +} + +static int spi_sirfsoc_transfer(struct spi_device *spi, struct spi_transfer *t) +{ + struct sirfsoc_spi *sspi; + + sspi = spi_master_get_devdata(spi->master); + sspi->tx = t->tx_buf; + sspi->rx = t->rx_buf; + sspi->left_tx_word = sspi->left_rx_word = t->len / sspi->word_width; + reinit_completion(&sspi->rx_done); + reinit_completion(&sspi->tx_done); + /* + * in the transfer, if transfer data using command register with rx_buf + * null, just fill command data into command register and wait for its + * completion. + */ + if (sspi->type == SIRF_REAL_SPI && sspi->tx_by_cmd) + spi_sirfsoc_cmd_transfer(spi, t); + else if (IS_DMA_VALID(t)) + spi_sirfsoc_dma_transfer(spi, t); + else + spi_sirfsoc_pio_transfer(spi, t); + + return t->len - sspi->left_rx_word * sspi->word_width; +} + +static void spi_sirfsoc_chipselect(struct spi_device *spi, int value) +{ + struct sirfsoc_spi *sspi = spi_master_get_devdata(spi->master); + + if (sspi->hw_cs) { + u32 regval; + + switch (sspi->type) { + case SIRF_REAL_SPI: + regval = readl(sspi->base + sspi->regs->spi_ctrl); + switch (value) { + case BITBANG_CS_ACTIVE: + if (spi->mode & SPI_CS_HIGH) + regval |= SIRFSOC_SPI_CS_IO_OUT; + else + regval &= ~SIRFSOC_SPI_CS_IO_OUT; + break; + case BITBANG_CS_INACTIVE: + if (spi->mode & SPI_CS_HIGH) + regval &= ~SIRFSOC_SPI_CS_IO_OUT; + else + regval |= SIRFSOC_SPI_CS_IO_OUT; + break; + } + writel(regval, sspi->base + sspi->regs->spi_ctrl); + break; + case SIRF_USP_SPI_P2: + case SIRF_USP_SPI_A7: + regval = readl(sspi->base + + sspi->regs->usp_pin_io_data); + switch (value) { + case BITBANG_CS_ACTIVE: + if (spi->mode & SPI_CS_HIGH) + regval |= SIRFSOC_USP_CS_HIGH_VALUE; + else + regval &= ~(SIRFSOC_USP_CS_HIGH_VALUE); + break; + case BITBANG_CS_INACTIVE: + if (spi->mode & SPI_CS_HIGH) + regval &= ~(SIRFSOC_USP_CS_HIGH_VALUE); + else + regval |= SIRFSOC_USP_CS_HIGH_VALUE; + break; + } + writel(regval, + sspi->base + sspi->regs->usp_pin_io_data); + break; + } + } else { + switch (value) { + case BITBANG_CS_ACTIVE: + gpio_direction_output(spi->cs_gpio, + spi->mode & SPI_CS_HIGH ? 1 : 0); + break; + case BITBANG_CS_INACTIVE: + gpio_direction_output(spi->cs_gpio, + spi->mode & SPI_CS_HIGH ? 0 : 1); + break; + } + } +} + +static int spi_sirfsoc_config_mode(struct spi_device *spi) +{ + struct sirfsoc_spi *sspi; + u32 regval, usp_mode1; + + sspi = spi_master_get_devdata(spi->master); + regval = readl(sspi->base + sspi->regs->spi_ctrl); + usp_mode1 = readl(sspi->base + sspi->regs->usp_mode1); + if (!(spi->mode & SPI_CS_HIGH)) { + regval |= SIRFSOC_SPI_CS_IDLE_STAT; + usp_mode1 &= ~SIRFSOC_USP_CS_HIGH_VALID; + } else { + regval &= ~SIRFSOC_SPI_CS_IDLE_STAT; + usp_mode1 |= SIRFSOC_USP_CS_HIGH_VALID; + } + if (!(spi->mode & SPI_LSB_FIRST)) { + regval |= SIRFSOC_SPI_TRAN_MSB; + usp_mode1 &= ~SIRFSOC_USP_LSB; + } else { + regval &= ~SIRFSOC_SPI_TRAN_MSB; + usp_mode1 |= SIRFSOC_USP_LSB; + } + if (spi->mode & SPI_CPOL) { + regval |= SIRFSOC_SPI_CLK_IDLE_STAT; + usp_mode1 |= SIRFSOC_USP_SCLK_IDLE_STAT; + } else { + regval &= ~SIRFSOC_SPI_CLK_IDLE_STAT; + usp_mode1 &= ~SIRFSOC_USP_SCLK_IDLE_STAT; + } + /* + * Data should be driven at least 1/2 cycle before the fetch edge + * to make sure that data gets stable at the fetch edge. + */ + if (((spi->mode & SPI_CPOL) && (spi->mode & SPI_CPHA)) || + (!(spi->mode & SPI_CPOL) && !(spi->mode & SPI_CPHA))) { + regval &= ~SIRFSOC_SPI_DRV_POS_EDGE; + usp_mode1 |= (SIRFSOC_USP_TXD_FALLING_EDGE | + SIRFSOC_USP_RXD_FALLING_EDGE); + } else { + regval |= SIRFSOC_SPI_DRV_POS_EDGE; + usp_mode1 &= ~(SIRFSOC_USP_RXD_FALLING_EDGE | + SIRFSOC_USP_TXD_FALLING_EDGE); + } + writel((SIRFSOC_SPI_FIFO_LEVEL_CHK_MASK(sspi, sspi->fifo_size - 2) << + SIRFSOC_SPI_FIFO_SC_OFFSET) | + (SIRFSOC_SPI_FIFO_LEVEL_CHK_MASK(sspi, sspi->fifo_size / 2) << + SIRFSOC_SPI_FIFO_LC_OFFSET) | + (SIRFSOC_SPI_FIFO_LEVEL_CHK_MASK(sspi, 2) << + SIRFSOC_SPI_FIFO_HC_OFFSET), + sspi->base + sspi->regs->txfifo_level_chk); + writel((SIRFSOC_SPI_FIFO_LEVEL_CHK_MASK(sspi, 2) << + SIRFSOC_SPI_FIFO_SC_OFFSET) | + (SIRFSOC_SPI_FIFO_LEVEL_CHK_MASK(sspi, sspi->fifo_size / 2) << + SIRFSOC_SPI_FIFO_LC_OFFSET) | + (SIRFSOC_SPI_FIFO_LEVEL_CHK_MASK(sspi, sspi->fifo_size - 2) << + SIRFSOC_SPI_FIFO_HC_OFFSET), + sspi->base + sspi->regs->rxfifo_level_chk); + /* + * it should never set to hardware cs mode because in hardware cs mode, + * cs signal can't controlled by driver. + */ + switch (sspi->type) { + case SIRF_REAL_SPI: + regval |= SIRFSOC_SPI_CS_IO_MODE; + writel(regval, sspi->base + sspi->regs->spi_ctrl); + break; + case SIRF_USP_SPI_P2: + case SIRF_USP_SPI_A7: + usp_mode1 |= SIRFSOC_USP_SYNC_MODE; + usp_mode1 |= SIRFSOC_USP_TFS_IO_MODE; + usp_mode1 &= ~SIRFSOC_USP_TFS_IO_INPUT; + writel(usp_mode1, sspi->base + sspi->regs->usp_mode1); + break; + } + + return 0; +} + +static int +spi_sirfsoc_setup_transfer(struct spi_device *spi, struct spi_transfer *t) +{ + struct sirfsoc_spi *sspi; + u8 bits_per_word = 0; + int hz = 0; + u32 regval, txfifo_ctrl, rxfifo_ctrl, tx_frm_ctl, rx_frm_ctl, usp_mode2; + + sspi = spi_master_get_devdata(spi->master); + + bits_per_word = (t) ? t->bits_per_word : spi->bits_per_word; + hz = t && t->speed_hz ? t->speed_hz : spi->max_speed_hz; + + usp_mode2 = regval = (sspi->ctrl_freq / (2 * hz)) - 1; + if (regval > 0xFFFF || regval < 0) { + dev_err(&spi->dev, "Speed %d not supported\n", hz); + return -EINVAL; + } + switch (bits_per_word) { + case 8: + regval |= SIRFSOC_SPI_TRAN_DAT_FORMAT_8; + sspi->rx_word = spi_sirfsoc_rx_word_u8; + sspi->tx_word = spi_sirfsoc_tx_word_u8; + break; + case 12: + case 16: + regval |= (bits_per_word == 12) ? + SIRFSOC_SPI_TRAN_DAT_FORMAT_12 : + SIRFSOC_SPI_TRAN_DAT_FORMAT_16; + sspi->rx_word = spi_sirfsoc_rx_word_u16; + sspi->tx_word = spi_sirfsoc_tx_word_u16; + break; + case 32: + regval |= SIRFSOC_SPI_TRAN_DAT_FORMAT_32; + sspi->rx_word = spi_sirfsoc_rx_word_u32; + sspi->tx_word = spi_sirfsoc_tx_word_u32; + break; + default: + dev_err(&spi->dev, "bpw %d not supported\n", bits_per_word); + return -EINVAL; + } + sspi->word_width = DIV_ROUND_UP(bits_per_word, 8); + txfifo_ctrl = (((sspi->fifo_size / 2) & + SIRFSOC_SPI_FIFO_THD_MASK(sspi)) + << SIRFSOC_SPI_FIFO_THD_OFFSET) | + (sspi->word_width >> 1); + rxfifo_ctrl = (((sspi->fifo_size / 2) & + SIRFSOC_SPI_FIFO_THD_MASK(sspi)) + << SIRFSOC_SPI_FIFO_THD_OFFSET) | + (sspi->word_width >> 1); + writel(txfifo_ctrl, sspi->base + sspi->regs->txfifo_ctrl); + writel(rxfifo_ctrl, sspi->base + sspi->regs->rxfifo_ctrl); + if (sspi->type == SIRF_USP_SPI_P2 || + sspi->type == SIRF_USP_SPI_A7) { + tx_frm_ctl = 0; + tx_frm_ctl |= ((bits_per_word - 1) & SIRFSOC_USP_TX_DATA_MASK) + << SIRFSOC_USP_TX_DATA_OFFSET; + tx_frm_ctl |= ((bits_per_word + 1 + SIRFSOC_USP_TXD_DELAY_LEN + - 1) & SIRFSOC_USP_TX_SYNC_MASK) << + SIRFSOC_USP_TX_SYNC_OFFSET; + tx_frm_ctl |= ((bits_per_word + 1 + SIRFSOC_USP_TXD_DELAY_LEN + + 2 - 1) & SIRFSOC_USP_TX_FRAME_MASK) << + SIRFSOC_USP_TX_FRAME_OFFSET; + tx_frm_ctl |= ((bits_per_word - 1) & + SIRFSOC_USP_TX_SHIFTER_MASK) << + SIRFSOC_USP_TX_SHIFTER_OFFSET; + rx_frm_ctl = 0; + rx_frm_ctl |= ((bits_per_word - 1) & SIRFSOC_USP_RX_DATA_MASK) + << SIRFSOC_USP_RX_DATA_OFFSET; + rx_frm_ctl |= ((bits_per_word + 1 + SIRFSOC_USP_RXD_DELAY_LEN + + 2 - 1) & SIRFSOC_USP_RX_FRAME_MASK) << + SIRFSOC_USP_RX_FRAME_OFFSET; + rx_frm_ctl |= ((bits_per_word - 1) + & SIRFSOC_USP_RX_SHIFTER_MASK) << + SIRFSOC_USP_RX_SHIFTER_OFFSET; + writel(tx_frm_ctl | (((usp_mode2 >> 10) & + SIRFSOC_USP_CLK_10_11_MASK) << + SIRFSOC_USP_CLK_10_11_OFFSET), + sspi->base + sspi->regs->usp_tx_frame_ctrl); + writel(rx_frm_ctl | (((usp_mode2 >> 12) & + SIRFSOC_USP_CLK_12_15_MASK) << + SIRFSOC_USP_CLK_12_15_OFFSET), + sspi->base + sspi->regs->usp_rx_frame_ctrl); + writel(readl(sspi->base + sspi->regs->usp_mode2) | + ((usp_mode2 & SIRFSOC_USP_CLK_DIVISOR_MASK) << + SIRFSOC_USP_CLK_DIVISOR_OFFSET) | + (SIRFSOC_USP_RXD_DELAY_LEN << + SIRFSOC_USP_RXD_DELAY_OFFSET) | + (SIRFSOC_USP_TXD_DELAY_LEN << + SIRFSOC_USP_TXD_DELAY_OFFSET), + sspi->base + sspi->regs->usp_mode2); + } + if (sspi->type == SIRF_REAL_SPI) + writel(regval, sspi->base + sspi->regs->spi_ctrl); + spi_sirfsoc_config_mode(spi); + if (sspi->type == SIRF_REAL_SPI) { + if (t && t->tx_buf && !t->rx_buf && + (t->len <= SIRFSOC_MAX_CMD_BYTES)) { + sspi->tx_by_cmd = true; + writel(readl(sspi->base + sspi->regs->spi_ctrl) | + (SIRFSOC_SPI_CMD_BYTE_NUM((t->len - 1)) | + SIRFSOC_SPI_CMD_MODE), + sspi->base + sspi->regs->spi_ctrl); + } else { + sspi->tx_by_cmd = false; + writel(readl(sspi->base + sspi->regs->spi_ctrl) & + ~SIRFSOC_SPI_CMD_MODE, + sspi->base + sspi->regs->spi_ctrl); + } + } + if (IS_DMA_VALID(t)) { + /* Enable DMA mode for RX, TX */ + writel(0, sspi->base + sspi->regs->tx_dma_io_ctrl); + writel(SIRFSOC_SPI_RX_DMA_FLUSH, + sspi->base + sspi->regs->rx_dma_io_ctrl); + } else { + /* Enable IO mode for RX, TX */ + writel(SIRFSOC_SPI_IO_MODE_SEL, + sspi->base + sspi->regs->tx_dma_io_ctrl); + writel(SIRFSOC_SPI_IO_MODE_SEL, + sspi->base + sspi->regs->rx_dma_io_ctrl); + } + return 0; +} + +static int spi_sirfsoc_setup(struct spi_device *spi) +{ + struct sirfsoc_spi *sspi; + int ret = 0; + + sspi = spi_master_get_devdata(spi->master); + if (spi->cs_gpio == -ENOENT) + sspi->hw_cs = true; + else { + sspi->hw_cs = false; + if (!spi_get_ctldata(spi)) { + void *cs = kmalloc(sizeof(int), GFP_KERNEL); + if (!cs) { + ret = -ENOMEM; + goto exit; + } + ret = gpio_is_valid(spi->cs_gpio); + if (!ret) { + dev_err(&spi->dev, "no valid gpio\n"); + ret = -ENOENT; + goto exit; + } + ret = gpio_request(spi->cs_gpio, DRIVER_NAME); + if (ret) { + dev_err(&spi->dev, "failed to request gpio\n"); + goto exit; + } + spi_set_ctldata(spi, cs); + } + } + spi_sirfsoc_config_mode(spi); + spi_sirfsoc_chipselect(spi, BITBANG_CS_INACTIVE); +exit: + return ret; +} + +static void spi_sirfsoc_cleanup(struct spi_device *spi) +{ + if (spi_get_ctldata(spi)) { + gpio_free(spi->cs_gpio); + kfree(spi_get_ctldata(spi)); + } +} + +static const struct sirf_spi_comp_data sirf_real_spi = { + .regs = &real_spi_register, + .type = SIRF_REAL_SPI, + .dat_max_frm_len = 64 * 1024, + .fifo_size = 256, +}; + +static const struct sirf_spi_comp_data sirf_usp_spi_p2 = { + .regs = &usp_spi_register, + .type = SIRF_USP_SPI_P2, + .dat_max_frm_len = 1024 * 1024, + .fifo_size = 128, + .hwinit = sirfsoc_usp_hwinit, +}; + +static const struct sirf_spi_comp_data sirf_usp_spi_a7 = { + .regs = &usp_spi_register, + .type = SIRF_USP_SPI_A7, + .dat_max_frm_len = 1024 * 1024, + .fifo_size = 512, + .hwinit = sirfsoc_usp_hwinit, +}; + +static const struct of_device_id spi_sirfsoc_of_match[] = { + { .compatible = "sirf,prima2-spi", .data = &sirf_real_spi}, + { .compatible = "sirf,prima2-usp-spi", .data = &sirf_usp_spi_p2}, + { .compatible = "sirf,atlas7-usp-spi", .data = &sirf_usp_spi_a7}, + {} +}; +MODULE_DEVICE_TABLE(of, spi_sirfsoc_of_match); + +static int spi_sirfsoc_probe(struct platform_device *pdev) +{ + struct sirfsoc_spi *sspi; + struct spi_master *master; + const struct sirf_spi_comp_data *spi_comp_data; + int irq; + int ret; + const struct of_device_id *match; + + ret = device_reset(&pdev->dev); + if (ret) { + dev_err(&pdev->dev, "SPI reset failed!\n"); + return ret; + } + + master = spi_alloc_master(&pdev->dev, sizeof(*sspi)); + if (!master) { + dev_err(&pdev->dev, "Unable to allocate SPI master\n"); + return -ENOMEM; + } + match = of_match_node(spi_sirfsoc_of_match, pdev->dev.of_node); + platform_set_drvdata(pdev, master); + sspi = spi_master_get_devdata(master); + sspi->fifo_full_offset = ilog2(sspi->fifo_size); + spi_comp_data = match->data; + sspi->regs = spi_comp_data->regs; + sspi->type = spi_comp_data->type; + sspi->fifo_level_chk_mask = (sspi->fifo_size / 4) - 1; + sspi->dat_max_frm_len = spi_comp_data->dat_max_frm_len; + sspi->fifo_size = spi_comp_data->fifo_size; + sspi->base = devm_platform_ioremap_resource(pdev, 0); + if (IS_ERR(sspi->base)) { + ret = PTR_ERR(sspi->base); + goto free_master; + } + irq = platform_get_irq(pdev, 0); + if (irq < 0) { + ret = -ENXIO; + goto free_master; + } + ret = devm_request_irq(&pdev->dev, irq, spi_sirfsoc_irq, 0, + DRIVER_NAME, sspi); + if (ret) + goto free_master; + + sspi->bitbang.master = master; + sspi->bitbang.chipselect = spi_sirfsoc_chipselect; + sspi->bitbang.setup_transfer = spi_sirfsoc_setup_transfer; + sspi->bitbang.txrx_bufs = spi_sirfsoc_transfer; + sspi->bitbang.master->setup = spi_sirfsoc_setup; + sspi->bitbang.master->cleanup = spi_sirfsoc_cleanup; + master->bus_num = pdev->id; + master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_LSB_FIRST | SPI_CS_HIGH; + master->bits_per_word_mask = SPI_BPW_MASK(8) | SPI_BPW_MASK(12) | + SPI_BPW_MASK(16) | SPI_BPW_MASK(32); + master->max_speed_hz = SIRFSOC_SPI_DEFAULT_FRQ; + master->flags = SPI_MASTER_MUST_RX | SPI_MASTER_MUST_TX; + sspi->bitbang.master->dev.of_node = pdev->dev.of_node; + + /* request DMA channels */ + sspi->rx_chan = dma_request_chan(&pdev->dev, "rx"); + if (IS_ERR(sspi->rx_chan)) { + dev_err(&pdev->dev, "can not allocate rx dma channel\n"); + ret = PTR_ERR(sspi->rx_chan); + goto free_master; + } + sspi->tx_chan = dma_request_chan(&pdev->dev, "tx"); + if (IS_ERR(sspi->tx_chan)) { + dev_err(&pdev->dev, "can not allocate tx dma channel\n"); + ret = PTR_ERR(sspi->tx_chan); + goto free_rx_dma; + } + + sspi->clk = clk_get(&pdev->dev, NULL); + if (IS_ERR(sspi->clk)) { + ret = PTR_ERR(sspi->clk); + goto free_tx_dma; + } + clk_prepare_enable(sspi->clk); + if (spi_comp_data->hwinit) + spi_comp_data->hwinit(sspi); + sspi->ctrl_freq = clk_get_rate(sspi->clk); + + init_completion(&sspi->rx_done); + init_completion(&sspi->tx_done); + + ret = spi_bitbang_start(&sspi->bitbang); + if (ret) + goto free_clk; + dev_info(&pdev->dev, "registered, bus number = %d\n", master->bus_num); + + return 0; +free_clk: + clk_disable_unprepare(sspi->clk); + clk_put(sspi->clk); +free_tx_dma: + dma_release_channel(sspi->tx_chan); +free_rx_dma: + dma_release_channel(sspi->rx_chan); +free_master: + spi_master_put(master); + + return ret; +} + +static int spi_sirfsoc_remove(struct platform_device *pdev) +{ + struct spi_master *master; + struct sirfsoc_spi *sspi; + + master = platform_get_drvdata(pdev); + sspi = spi_master_get_devdata(master); + spi_bitbang_stop(&sspi->bitbang); + clk_disable_unprepare(sspi->clk); + clk_put(sspi->clk); + dma_release_channel(sspi->rx_chan); + dma_release_channel(sspi->tx_chan); + spi_master_put(master); + return 0; +} + +#ifdef CONFIG_PM_SLEEP +static int spi_sirfsoc_suspend(struct device *dev) +{ + struct spi_master *master = dev_get_drvdata(dev); + struct sirfsoc_spi *sspi = spi_master_get_devdata(master); + int ret; + + ret = spi_master_suspend(master); + if (ret) + return ret; + + clk_disable(sspi->clk); + return 0; +} + +static int spi_sirfsoc_resume(struct device *dev) +{ + struct spi_master *master = dev_get_drvdata(dev); + struct sirfsoc_spi *sspi = spi_master_get_devdata(master); + + clk_enable(sspi->clk); + writel(SIRFSOC_SPI_FIFO_RESET, sspi->base + sspi->regs->txfifo_op); + writel(SIRFSOC_SPI_FIFO_RESET, sspi->base + sspi->regs->rxfifo_op); + writel(SIRFSOC_SPI_FIFO_START, sspi->base + sspi->regs->txfifo_op); + writel(SIRFSOC_SPI_FIFO_START, sspi->base + sspi->regs->rxfifo_op); + return 0; +} +#endif + +static SIMPLE_DEV_PM_OPS(spi_sirfsoc_pm_ops, spi_sirfsoc_suspend, + spi_sirfsoc_resume); + +static struct platform_driver spi_sirfsoc_driver = { + .driver = { + .name = DRIVER_NAME, + .pm = &spi_sirfsoc_pm_ops, + .of_match_table = spi_sirfsoc_of_match, + }, + .probe = spi_sirfsoc_probe, + .remove = spi_sirfsoc_remove, +}; +module_platform_driver(spi_sirfsoc_driver); +MODULE_DESCRIPTION("SiRF SoC SPI master driver"); +MODULE_AUTHOR("Zhiwu Song <Zhiwu.Song@csr.com>"); +MODULE_AUTHOR("Barry Song <Baohua.Song@csr.com>"); +MODULE_AUTHOR("Qipan Li <Qipan.Li@csr.com>"); +MODULE_LICENSE("GPL v2"); diff --git a/drivers/spi/spi-slave-mt27xx.c b/drivers/spi/spi-slave-mt27xx.c new file mode 100644 index 000000000..44edaa360 --- /dev/null +++ b/drivers/spi/spi-slave-mt27xx.c @@ -0,0 +1,543 @@ +// SPDX-License-Identifier: GPL-2.0+ +// Copyright (c) 2018 MediaTek Inc. + +#include <linux/clk.h> +#include <linux/device.h> +#include <linux/dma-mapping.h> +#include <linux/err.h> +#include <linux/interrupt.h> +#include <linux/module.h> +#include <linux/platform_device.h> +#include <linux/pm_runtime.h> +#include <linux/spi/spi.h> + +#define SPIS_IRQ_EN_REG 0x0 +#define SPIS_IRQ_CLR_REG 0x4 +#define SPIS_IRQ_ST_REG 0x8 +#define SPIS_IRQ_MASK_REG 0xc +#define SPIS_CFG_REG 0x10 +#define SPIS_RX_DATA_REG 0x14 +#define SPIS_TX_DATA_REG 0x18 +#define SPIS_RX_DST_REG 0x1c +#define SPIS_TX_SRC_REG 0x20 +#define SPIS_DMA_CFG_REG 0x30 +#define SPIS_SOFT_RST_REG 0x40 + +/* SPIS_IRQ_EN_REG */ +#define DMA_DONE_EN BIT(7) +#define DATA_DONE_EN BIT(2) +#define RSTA_DONE_EN BIT(1) +#define CMD_INVALID_EN BIT(0) + +/* SPIS_IRQ_ST_REG */ +#define DMA_DONE_ST BIT(7) +#define DATA_DONE_ST BIT(2) +#define RSTA_DONE_ST BIT(1) +#define CMD_INVALID_ST BIT(0) + +/* SPIS_IRQ_MASK_REG */ +#define DMA_DONE_MASK BIT(7) +#define DATA_DONE_MASK BIT(2) +#define RSTA_DONE_MASK BIT(1) +#define CMD_INVALID_MASK BIT(0) + +/* SPIS_CFG_REG */ +#define SPIS_TX_ENDIAN BIT(7) +#define SPIS_RX_ENDIAN BIT(6) +#define SPIS_TXMSBF BIT(5) +#define SPIS_RXMSBF BIT(4) +#define SPIS_CPHA BIT(3) +#define SPIS_CPOL BIT(2) +#define SPIS_TX_EN BIT(1) +#define SPIS_RX_EN BIT(0) + +/* SPIS_DMA_CFG_REG */ +#define TX_DMA_TRIG_EN BIT(31) +#define TX_DMA_EN BIT(30) +#define RX_DMA_EN BIT(29) +#define TX_DMA_LEN 0xfffff + +/* SPIS_SOFT_RST_REG */ +#define SPIS_DMA_ADDR_EN BIT(1) +#define SPIS_SOFT_RST BIT(0) + +#define MTK_SPI_SLAVE_MAX_FIFO_SIZE 512U + +struct mtk_spi_slave { + struct device *dev; + void __iomem *base; + struct clk *spi_clk; + struct completion xfer_done; + struct spi_transfer *cur_transfer; + bool slave_aborted; +}; + +static const struct of_device_id mtk_spi_slave_of_match[] = { + { .compatible = "mediatek,mt2712-spi-slave", }, + {} +}; +MODULE_DEVICE_TABLE(of, mtk_spi_slave_of_match); + +static void mtk_spi_slave_disable_dma(struct mtk_spi_slave *mdata) +{ + u32 reg_val; + + reg_val = readl(mdata->base + SPIS_DMA_CFG_REG); + reg_val &= ~RX_DMA_EN; + reg_val &= ~TX_DMA_EN; + writel(reg_val, mdata->base + SPIS_DMA_CFG_REG); +} + +static void mtk_spi_slave_disable_xfer(struct mtk_spi_slave *mdata) +{ + u32 reg_val; + + reg_val = readl(mdata->base + SPIS_CFG_REG); + reg_val &= ~SPIS_TX_EN; + reg_val &= ~SPIS_RX_EN; + writel(reg_val, mdata->base + SPIS_CFG_REG); +} + +static int mtk_spi_slave_wait_for_completion(struct mtk_spi_slave *mdata) +{ + if (wait_for_completion_interruptible(&mdata->xfer_done) || + mdata->slave_aborted) { + dev_err(mdata->dev, "interrupted\n"); + return -EINTR; + } + + return 0; +} + +static int mtk_spi_slave_prepare_message(struct spi_controller *ctlr, + struct spi_message *msg) +{ + struct mtk_spi_slave *mdata = spi_controller_get_devdata(ctlr); + struct spi_device *spi = msg->spi; + bool cpha, cpol; + u32 reg_val; + + cpha = spi->mode & SPI_CPHA ? 1 : 0; + cpol = spi->mode & SPI_CPOL ? 1 : 0; + + reg_val = readl(mdata->base + SPIS_CFG_REG); + if (cpha) + reg_val |= SPIS_CPHA; + else + reg_val &= ~SPIS_CPHA; + if (cpol) + reg_val |= SPIS_CPOL; + else + reg_val &= ~SPIS_CPOL; + + if (spi->mode & SPI_LSB_FIRST) + reg_val &= ~(SPIS_TXMSBF | SPIS_RXMSBF); + else + reg_val |= SPIS_TXMSBF | SPIS_RXMSBF; + + reg_val &= ~SPIS_TX_ENDIAN; + reg_val &= ~SPIS_RX_ENDIAN; + writel(reg_val, mdata->base + SPIS_CFG_REG); + + return 0; +} + +static int mtk_spi_slave_fifo_transfer(struct spi_controller *ctlr, + struct spi_device *spi, + struct spi_transfer *xfer) +{ + struct mtk_spi_slave *mdata = spi_controller_get_devdata(ctlr); + int reg_val, cnt, remainder, ret; + + writel(SPIS_SOFT_RST, mdata->base + SPIS_SOFT_RST_REG); + + reg_val = readl(mdata->base + SPIS_CFG_REG); + if (xfer->rx_buf) + reg_val |= SPIS_RX_EN; + if (xfer->tx_buf) + reg_val |= SPIS_TX_EN; + writel(reg_val, mdata->base + SPIS_CFG_REG); + + cnt = xfer->len / 4; + if (xfer->tx_buf) + iowrite32_rep(mdata->base + SPIS_TX_DATA_REG, + xfer->tx_buf, cnt); + + remainder = xfer->len % 4; + if (xfer->tx_buf && remainder > 0) { + reg_val = 0; + memcpy(®_val, xfer->tx_buf + cnt * 4, remainder); + writel(reg_val, mdata->base + SPIS_TX_DATA_REG); + } + + ret = mtk_spi_slave_wait_for_completion(mdata); + if (ret) { + mtk_spi_slave_disable_xfer(mdata); + writel(SPIS_SOFT_RST, mdata->base + SPIS_SOFT_RST_REG); + } + + return ret; +} + +static int mtk_spi_slave_dma_transfer(struct spi_controller *ctlr, + struct spi_device *spi, + struct spi_transfer *xfer) +{ + struct mtk_spi_slave *mdata = spi_controller_get_devdata(ctlr); + struct device *dev = mdata->dev; + int reg_val, ret; + + writel(SPIS_SOFT_RST, mdata->base + SPIS_SOFT_RST_REG); + + if (xfer->tx_buf) { + /* tx_buf is a const void* where we need a void * for + * the dma mapping + */ + void *nonconst_tx = (void *)xfer->tx_buf; + + xfer->tx_dma = dma_map_single(dev, nonconst_tx, + xfer->len, DMA_TO_DEVICE); + if (dma_mapping_error(dev, xfer->tx_dma)) { + ret = -ENOMEM; + goto disable_transfer; + } + } + + if (xfer->rx_buf) { + xfer->rx_dma = dma_map_single(dev, xfer->rx_buf, + xfer->len, DMA_FROM_DEVICE); + if (dma_mapping_error(dev, xfer->rx_dma)) { + ret = -ENOMEM; + goto unmap_txdma; + } + } + + writel(xfer->tx_dma, mdata->base + SPIS_TX_SRC_REG); + writel(xfer->rx_dma, mdata->base + SPIS_RX_DST_REG); + + writel(SPIS_DMA_ADDR_EN, mdata->base + SPIS_SOFT_RST_REG); + + /* enable config reg tx rx_enable */ + reg_val = readl(mdata->base + SPIS_CFG_REG); + if (xfer->tx_buf) + reg_val |= SPIS_TX_EN; + if (xfer->rx_buf) + reg_val |= SPIS_RX_EN; + writel(reg_val, mdata->base + SPIS_CFG_REG); + + /* config dma */ + reg_val = 0; + reg_val |= (xfer->len - 1) & TX_DMA_LEN; + writel(reg_val, mdata->base + SPIS_DMA_CFG_REG); + + reg_val = readl(mdata->base + SPIS_DMA_CFG_REG); + if (xfer->tx_buf) + reg_val |= TX_DMA_EN; + if (xfer->rx_buf) + reg_val |= RX_DMA_EN; + reg_val |= TX_DMA_TRIG_EN; + writel(reg_val, mdata->base + SPIS_DMA_CFG_REG); + + ret = mtk_spi_slave_wait_for_completion(mdata); + if (ret) + goto unmap_rxdma; + + return 0; + +unmap_rxdma: + if (xfer->rx_buf) + dma_unmap_single(dev, xfer->rx_dma, + xfer->len, DMA_FROM_DEVICE); + +unmap_txdma: + if (xfer->tx_buf) + dma_unmap_single(dev, xfer->tx_dma, + xfer->len, DMA_TO_DEVICE); + +disable_transfer: + mtk_spi_slave_disable_dma(mdata); + mtk_spi_slave_disable_xfer(mdata); + writel(SPIS_SOFT_RST, mdata->base + SPIS_SOFT_RST_REG); + + return ret; +} + +static int mtk_spi_slave_transfer_one(struct spi_controller *ctlr, + struct spi_device *spi, + struct spi_transfer *xfer) +{ + struct mtk_spi_slave *mdata = spi_controller_get_devdata(ctlr); + + reinit_completion(&mdata->xfer_done); + mdata->slave_aborted = false; + mdata->cur_transfer = xfer; + + if (xfer->len > MTK_SPI_SLAVE_MAX_FIFO_SIZE) + return mtk_spi_slave_dma_transfer(ctlr, spi, xfer); + else + return mtk_spi_slave_fifo_transfer(ctlr, spi, xfer); +} + +static int mtk_spi_slave_setup(struct spi_device *spi) +{ + struct mtk_spi_slave *mdata = spi_controller_get_devdata(spi->master); + u32 reg_val; + + reg_val = DMA_DONE_EN | DATA_DONE_EN | + RSTA_DONE_EN | CMD_INVALID_EN; + writel(reg_val, mdata->base + SPIS_IRQ_EN_REG); + + reg_val = DMA_DONE_MASK | DATA_DONE_MASK | + RSTA_DONE_MASK | CMD_INVALID_MASK; + writel(reg_val, mdata->base + SPIS_IRQ_MASK_REG); + + mtk_spi_slave_disable_dma(mdata); + mtk_spi_slave_disable_xfer(mdata); + + return 0; +} + +static int mtk_slave_abort(struct spi_controller *ctlr) +{ + struct mtk_spi_slave *mdata = spi_controller_get_devdata(ctlr); + + mdata->slave_aborted = true; + complete(&mdata->xfer_done); + + return 0; +} + +static irqreturn_t mtk_spi_slave_interrupt(int irq, void *dev_id) +{ + struct spi_controller *ctlr = dev_id; + struct mtk_spi_slave *mdata = spi_controller_get_devdata(ctlr); + struct spi_transfer *trans = mdata->cur_transfer; + u32 int_status, reg_val, cnt, remainder; + + int_status = readl(mdata->base + SPIS_IRQ_ST_REG); + writel(int_status, mdata->base + SPIS_IRQ_CLR_REG); + + if (!trans) + return IRQ_NONE; + + if ((int_status & DMA_DONE_ST) && + ((int_status & DATA_DONE_ST) || + (int_status & RSTA_DONE_ST))) { + writel(SPIS_SOFT_RST, mdata->base + SPIS_SOFT_RST_REG); + + if (trans->tx_buf) + dma_unmap_single(mdata->dev, trans->tx_dma, + trans->len, DMA_TO_DEVICE); + if (trans->rx_buf) + dma_unmap_single(mdata->dev, trans->rx_dma, + trans->len, DMA_FROM_DEVICE); + + mtk_spi_slave_disable_dma(mdata); + mtk_spi_slave_disable_xfer(mdata); + } + + if ((!(int_status & DMA_DONE_ST)) && + ((int_status & DATA_DONE_ST) || + (int_status & RSTA_DONE_ST))) { + cnt = trans->len / 4; + if (trans->rx_buf) + ioread32_rep(mdata->base + SPIS_RX_DATA_REG, + trans->rx_buf, cnt); + remainder = trans->len % 4; + if (trans->rx_buf && remainder > 0) { + reg_val = readl(mdata->base + SPIS_RX_DATA_REG); + memcpy(trans->rx_buf + (cnt * 4), + ®_val, remainder); + } + + mtk_spi_slave_disable_xfer(mdata); + } + + if (int_status & CMD_INVALID_ST) { + dev_warn(&ctlr->dev, "cmd invalid\n"); + return IRQ_NONE; + } + + mdata->cur_transfer = NULL; + complete(&mdata->xfer_done); + + return IRQ_HANDLED; +} + +static int mtk_spi_slave_probe(struct platform_device *pdev) +{ + struct spi_controller *ctlr; + struct mtk_spi_slave *mdata; + int irq, ret; + + ctlr = spi_alloc_slave(&pdev->dev, sizeof(*mdata)); + if (!ctlr) { + dev_err(&pdev->dev, "failed to alloc spi slave\n"); + return -ENOMEM; + } + + ctlr->auto_runtime_pm = true; + ctlr->dev.of_node = pdev->dev.of_node; + ctlr->mode_bits = SPI_CPOL | SPI_CPHA; + ctlr->mode_bits |= SPI_LSB_FIRST; + + ctlr->prepare_message = mtk_spi_slave_prepare_message; + ctlr->transfer_one = mtk_spi_slave_transfer_one; + ctlr->setup = mtk_spi_slave_setup; + ctlr->slave_abort = mtk_slave_abort; + + mdata = spi_controller_get_devdata(ctlr); + + platform_set_drvdata(pdev, ctlr); + + init_completion(&mdata->xfer_done); + mdata->dev = &pdev->dev; + mdata->base = devm_platform_ioremap_resource(pdev, 0); + if (IS_ERR(mdata->base)) { + ret = PTR_ERR(mdata->base); + goto err_put_ctlr; + } + + irq = platform_get_irq(pdev, 0); + if (irq < 0) { + ret = irq; + goto err_put_ctlr; + } + + ret = devm_request_irq(&pdev->dev, irq, mtk_spi_slave_interrupt, + IRQF_TRIGGER_NONE, dev_name(&pdev->dev), ctlr); + if (ret) { + dev_err(&pdev->dev, "failed to register irq (%d)\n", ret); + goto err_put_ctlr; + } + + mdata->spi_clk = devm_clk_get(&pdev->dev, "spi"); + if (IS_ERR(mdata->spi_clk)) { + ret = PTR_ERR(mdata->spi_clk); + dev_err(&pdev->dev, "failed to get spi-clk: %d\n", ret); + goto err_put_ctlr; + } + + ret = clk_prepare_enable(mdata->spi_clk); + if (ret < 0) { + dev_err(&pdev->dev, "failed to enable spi_clk (%d)\n", ret); + goto err_put_ctlr; + } + + pm_runtime_enable(&pdev->dev); + + ret = devm_spi_register_controller(&pdev->dev, ctlr); + if (ret) { + dev_err(&pdev->dev, + "failed to register slave controller(%d)\n", ret); + clk_disable_unprepare(mdata->spi_clk); + goto err_disable_runtime_pm; + } + + clk_disable_unprepare(mdata->spi_clk); + + return 0; + +err_disable_runtime_pm: + pm_runtime_disable(&pdev->dev); +err_put_ctlr: + spi_controller_put(ctlr); + + return ret; +} + +static int mtk_spi_slave_remove(struct platform_device *pdev) +{ + pm_runtime_disable(&pdev->dev); + + return 0; +} + +#ifdef CONFIG_PM_SLEEP +static int mtk_spi_slave_suspend(struct device *dev) +{ + struct spi_controller *ctlr = dev_get_drvdata(dev); + struct mtk_spi_slave *mdata = spi_controller_get_devdata(ctlr); + int ret; + + ret = spi_controller_suspend(ctlr); + if (ret) + return ret; + + if (!pm_runtime_suspended(dev)) + clk_disable_unprepare(mdata->spi_clk); + + return ret; +} + +static int mtk_spi_slave_resume(struct device *dev) +{ + struct spi_controller *ctlr = dev_get_drvdata(dev); + struct mtk_spi_slave *mdata = spi_controller_get_devdata(ctlr); + int ret; + + if (!pm_runtime_suspended(dev)) { + ret = clk_prepare_enable(mdata->spi_clk); + if (ret < 0) { + dev_err(dev, "failed to enable spi_clk (%d)\n", ret); + return ret; + } + } + + ret = spi_controller_resume(ctlr); + if (ret < 0) + clk_disable_unprepare(mdata->spi_clk); + + return ret; +} +#endif /* CONFIG_PM_SLEEP */ + +#ifdef CONFIG_PM +static int mtk_spi_slave_runtime_suspend(struct device *dev) +{ + struct spi_controller *ctlr = dev_get_drvdata(dev); + struct mtk_spi_slave *mdata = spi_controller_get_devdata(ctlr); + + clk_disable_unprepare(mdata->spi_clk); + + return 0; +} + +static int mtk_spi_slave_runtime_resume(struct device *dev) +{ + struct spi_controller *ctlr = dev_get_drvdata(dev); + struct mtk_spi_slave *mdata = spi_controller_get_devdata(ctlr); + int ret; + + ret = clk_prepare_enable(mdata->spi_clk); + if (ret < 0) { + dev_err(dev, "failed to enable spi_clk (%d)\n", ret); + return ret; + } + + return 0; +} +#endif /* CONFIG_PM */ + +static const struct dev_pm_ops mtk_spi_slave_pm = { + SET_SYSTEM_SLEEP_PM_OPS(mtk_spi_slave_suspend, mtk_spi_slave_resume) + SET_RUNTIME_PM_OPS(mtk_spi_slave_runtime_suspend, + mtk_spi_slave_runtime_resume, NULL) +}; + +static struct platform_driver mtk_spi_slave_driver = { + .driver = { + .name = "mtk-spi-slave", + .pm = &mtk_spi_slave_pm, + .of_match_table = mtk_spi_slave_of_match, + }, + .probe = mtk_spi_slave_probe, + .remove = mtk_spi_slave_remove, +}; + +module_platform_driver(mtk_spi_slave_driver); + +MODULE_DESCRIPTION("MTK SPI Slave Controller driver"); +MODULE_AUTHOR("Leilk Liu <leilk.liu@mediatek.com>"); +MODULE_LICENSE("GPL v2"); +MODULE_ALIAS("platform:mtk-spi-slave"); diff --git a/drivers/spi/spi-slave-system-control.c b/drivers/spi/spi-slave-system-control.c new file mode 100644 index 000000000..169f3d595 --- /dev/null +++ b/drivers/spi/spi-slave-system-control.c @@ -0,0 +1,155 @@ +/* + * SPI slave handler controlling system state + * + * This SPI slave handler allows remote control of system reboot, power off, + * halt, and suspend. + * + * Copyright (C) 2016-2017 Glider bvba + * + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file "COPYING" in the main directory of this archive + * for more details. + * + * Usage (assuming /dev/spidev2.0 corresponds to the SPI master on the remote + * system): + * + * # reboot='\x7c\x50' + * # poweroff='\x71\x3f' + * # halt='\x38\x76' + * # suspend='\x1b\x1b' + * # spidev_test -D /dev/spidev2.0 -p $suspend # or $reboot, $poweroff, $halt + */ + +#include <linux/completion.h> +#include <linux/module.h> +#include <linux/reboot.h> +#include <linux/suspend.h> +#include <linux/spi/spi.h> + +/* + * The numbers are chosen to display something human-readable on two 7-segment + * displays connected to two 74HC595 shift registers + */ +#define CMD_REBOOT 0x7c50 /* rb */ +#define CMD_POWEROFF 0x713f /* OF */ +#define CMD_HALT 0x3876 /* HL */ +#define CMD_SUSPEND 0x1b1b /* ZZ */ + +struct spi_slave_system_control_priv { + struct spi_device *spi; + struct completion finished; + struct spi_transfer xfer; + struct spi_message msg; + __be16 cmd; +}; + +static +int spi_slave_system_control_submit(struct spi_slave_system_control_priv *priv); + +static void spi_slave_system_control_complete(void *arg) +{ + struct spi_slave_system_control_priv *priv = arg; + u16 cmd; + int ret; + + if (priv->msg.status) + goto terminate; + + cmd = be16_to_cpu(priv->cmd); + switch (cmd) { + case CMD_REBOOT: + dev_info(&priv->spi->dev, "Rebooting system...\n"); + kernel_restart(NULL); + break; + + case CMD_POWEROFF: + dev_info(&priv->spi->dev, "Powering off system...\n"); + kernel_power_off(); + break; + + case CMD_HALT: + dev_info(&priv->spi->dev, "Halting system...\n"); + kernel_halt(); + break; + + case CMD_SUSPEND: + dev_info(&priv->spi->dev, "Suspending system...\n"); + pm_suspend(PM_SUSPEND_MEM); + break; + + default: + dev_warn(&priv->spi->dev, "Unknown command 0x%x\n", cmd); + break; + } + + ret = spi_slave_system_control_submit(priv); + if (ret) + goto terminate; + + return; + +terminate: + dev_info(&priv->spi->dev, "Terminating\n"); + complete(&priv->finished); +} + +static +int spi_slave_system_control_submit(struct spi_slave_system_control_priv *priv) +{ + int ret; + + spi_message_init_with_transfers(&priv->msg, &priv->xfer, 1); + + priv->msg.complete = spi_slave_system_control_complete; + priv->msg.context = priv; + + ret = spi_async(priv->spi, &priv->msg); + if (ret) + dev_err(&priv->spi->dev, "spi_async() failed %d\n", ret); + + return ret; +} + +static int spi_slave_system_control_probe(struct spi_device *spi) +{ + struct spi_slave_system_control_priv *priv; + int ret; + + priv = devm_kzalloc(&spi->dev, sizeof(*priv), GFP_KERNEL); + if (!priv) + return -ENOMEM; + + priv->spi = spi; + init_completion(&priv->finished); + priv->xfer.rx_buf = &priv->cmd; + priv->xfer.len = sizeof(priv->cmd); + + ret = spi_slave_system_control_submit(priv); + if (ret) + return ret; + + spi_set_drvdata(spi, priv); + return 0; +} + +static int spi_slave_system_control_remove(struct spi_device *spi) +{ + struct spi_slave_system_control_priv *priv = spi_get_drvdata(spi); + + spi_slave_abort(spi); + wait_for_completion(&priv->finished); + return 0; +} + +static struct spi_driver spi_slave_system_control_driver = { + .driver = { + .name = "spi-slave-system-control", + }, + .probe = spi_slave_system_control_probe, + .remove = spi_slave_system_control_remove, +}; +module_spi_driver(spi_slave_system_control_driver); + +MODULE_AUTHOR("Geert Uytterhoeven <geert+renesas@glider.be>"); +MODULE_DESCRIPTION("SPI slave handler controlling system state"); +MODULE_LICENSE("GPL v2"); diff --git a/drivers/spi/spi-slave-time.c b/drivers/spi/spi-slave-time.c new file mode 100644 index 000000000..f2e07a392 --- /dev/null +++ b/drivers/spi/spi-slave-time.c @@ -0,0 +1,129 @@ +/* + * SPI slave handler reporting uptime at reception of previous SPI message + * + * This SPI slave handler sends the time of reception of the last SPI message + * as two 32-bit unsigned integers in binary format and in network byte order, + * representing the number of seconds and fractional seconds (in microseconds) + * since boot up. + * + * Copyright (C) 2016-2017 Glider bvba + * + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file "COPYING" in the main directory of this archive + * for more details. + * + * Usage (assuming /dev/spidev2.0 corresponds to the SPI master on the remote + * system): + * + * # spidev_test -D /dev/spidev2.0 -p dummy-8B + * spi mode: 0x0 + * bits per word: 8 + * max speed: 500000 Hz (500 KHz) + * RX | 00 00 04 6D 00 09 5B BB ... + * ^^^^^ ^^^^^^^^ + * seconds microseconds + */ + +#include <linux/completion.h> +#include <linux/module.h> +#include <linux/sched/clock.h> +#include <linux/spi/spi.h> + + +struct spi_slave_time_priv { + struct spi_device *spi; + struct completion finished; + struct spi_transfer xfer; + struct spi_message msg; + __be32 buf[2]; +}; + +static int spi_slave_time_submit(struct spi_slave_time_priv *priv); + +static void spi_slave_time_complete(void *arg) +{ + struct spi_slave_time_priv *priv = arg; + int ret; + + ret = priv->msg.status; + if (ret) + goto terminate; + + ret = spi_slave_time_submit(priv); + if (ret) + goto terminate; + + return; + +terminate: + dev_info(&priv->spi->dev, "Terminating\n"); + complete(&priv->finished); +} + +static int spi_slave_time_submit(struct spi_slave_time_priv *priv) +{ + u32 rem_us; + int ret; + u64 ts; + + ts = local_clock(); + rem_us = do_div(ts, 1000000000) / 1000; + + priv->buf[0] = cpu_to_be32(ts); + priv->buf[1] = cpu_to_be32(rem_us); + + spi_message_init_with_transfers(&priv->msg, &priv->xfer, 1); + + priv->msg.complete = spi_slave_time_complete; + priv->msg.context = priv; + + ret = spi_async(priv->spi, &priv->msg); + if (ret) + dev_err(&priv->spi->dev, "spi_async() failed %d\n", ret); + + return ret; +} + +static int spi_slave_time_probe(struct spi_device *spi) +{ + struct spi_slave_time_priv *priv; + int ret; + + priv = devm_kzalloc(&spi->dev, sizeof(*priv), GFP_KERNEL); + if (!priv) + return -ENOMEM; + + priv->spi = spi; + init_completion(&priv->finished); + priv->xfer.tx_buf = priv->buf; + priv->xfer.len = sizeof(priv->buf); + + ret = spi_slave_time_submit(priv); + if (ret) + return ret; + + spi_set_drvdata(spi, priv); + return 0; +} + +static int spi_slave_time_remove(struct spi_device *spi) +{ + struct spi_slave_time_priv *priv = spi_get_drvdata(spi); + + spi_slave_abort(spi); + wait_for_completion(&priv->finished); + return 0; +} + +static struct spi_driver spi_slave_time_driver = { + .driver = { + .name = "spi-slave-time", + }, + .probe = spi_slave_time_probe, + .remove = spi_slave_time_remove, +}; +module_spi_driver(spi_slave_time_driver); + +MODULE_AUTHOR("Geert Uytterhoeven <geert+renesas@glider.be>"); +MODULE_DESCRIPTION("SPI slave reporting uptime at previous SPI message"); +MODULE_LICENSE("GPL v2"); diff --git a/drivers/spi/spi-sprd-adi.c b/drivers/spi/spi-sprd-adi.c new file mode 100644 index 000000000..307c079b9 --- /dev/null +++ b/drivers/spi/spi-sprd-adi.c @@ -0,0 +1,572 @@ +/* + * Copyright (C) 2017 Spreadtrum Communications Inc. + * + * SPDX-License-Identifier: GPL-2.0 + */ + +#include <linux/delay.h> +#include <linux/hwspinlock.h> +#include <linux/init.h> +#include <linux/io.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/of.h> +#include <linux/of_device.h> +#include <linux/platform_device.h> +#include <linux/reboot.h> +#include <linux/spi/spi.h> +#include <linux/sizes.h> + +/* Registers definitions for ADI controller */ +#define REG_ADI_CTRL0 0x4 +#define REG_ADI_CHN_PRIL 0x8 +#define REG_ADI_CHN_PRIH 0xc +#define REG_ADI_INT_EN 0x10 +#define REG_ADI_INT_RAW 0x14 +#define REG_ADI_INT_MASK 0x18 +#define REG_ADI_INT_CLR 0x1c +#define REG_ADI_GSSI_CFG0 0x20 +#define REG_ADI_GSSI_CFG1 0x24 +#define REG_ADI_RD_CMD 0x28 +#define REG_ADI_RD_DATA 0x2c +#define REG_ADI_ARM_FIFO_STS 0x30 +#define REG_ADI_STS 0x34 +#define REG_ADI_EVT_FIFO_STS 0x38 +#define REG_ADI_ARM_CMD_STS 0x3c +#define REG_ADI_CHN_EN 0x40 +#define REG_ADI_CHN_ADDR(id) (0x44 + (id - 2) * 4) +#define REG_ADI_CHN_EN1 0x20c + +/* Bits definitions for register REG_ADI_GSSI_CFG0 */ +#define BIT_CLK_ALL_ON BIT(30) + +/* Bits definitions for register REG_ADI_RD_DATA */ +#define BIT_RD_CMD_BUSY BIT(31) +#define RD_ADDR_SHIFT 16 +#define RD_VALUE_MASK GENMASK(15, 0) +#define RD_ADDR_MASK GENMASK(30, 16) + +/* Bits definitions for register REG_ADI_ARM_FIFO_STS */ +#define BIT_FIFO_FULL BIT(11) +#define BIT_FIFO_EMPTY BIT(10) + +/* + * ADI slave devices include RTC, ADC, regulator, charger, thermal and so on. + * The slave devices address offset is always 0x8000 and size is 4K. + */ +#define ADI_SLAVE_ADDR_SIZE SZ_4K +#define ADI_SLAVE_OFFSET 0x8000 + +/* Timeout (ms) for the trylock of hardware spinlocks */ +#define ADI_HWSPINLOCK_TIMEOUT 5000 +/* + * ADI controller has 50 channels including 2 software channels + * and 48 hardware channels. + */ +#define ADI_HW_CHNS 50 + +#define ADI_FIFO_DRAIN_TIMEOUT 1000 +#define ADI_READ_TIMEOUT 2000 +#define REG_ADDR_LOW_MASK GENMASK(11, 0) + +/* Registers definitions for PMIC watchdog controller */ +#define REG_WDG_LOAD_LOW 0x80 +#define REG_WDG_LOAD_HIGH 0x84 +#define REG_WDG_CTRL 0x88 +#define REG_WDG_LOCK 0xa0 + +/* Bits definitions for register REG_WDG_CTRL */ +#define BIT_WDG_RUN BIT(1) +#define BIT_WDG_NEW BIT(2) +#define BIT_WDG_RST BIT(3) + +/* Registers definitions for PMIC */ +#define PMIC_RST_STATUS 0xee8 +#define PMIC_MODULE_EN 0xc08 +#define PMIC_CLK_EN 0xc18 +#define BIT_WDG_EN BIT(2) + +/* Definition of PMIC reset status register */ +#define HWRST_STATUS_SECURITY 0x02 +#define HWRST_STATUS_RECOVERY 0x20 +#define HWRST_STATUS_NORMAL 0x40 +#define HWRST_STATUS_ALARM 0x50 +#define HWRST_STATUS_SLEEP 0x60 +#define HWRST_STATUS_FASTBOOT 0x30 +#define HWRST_STATUS_SPECIAL 0x70 +#define HWRST_STATUS_PANIC 0x80 +#define HWRST_STATUS_CFTREBOOT 0x90 +#define HWRST_STATUS_AUTODLOADER 0xa0 +#define HWRST_STATUS_IQMODE 0xb0 +#define HWRST_STATUS_SPRDISK 0xc0 +#define HWRST_STATUS_FACTORYTEST 0xe0 +#define HWRST_STATUS_WATCHDOG 0xf0 + +/* Use default timeout 50 ms that converts to watchdog values */ +#define WDG_LOAD_VAL ((50 * 32768) / 1000) +#define WDG_LOAD_MASK GENMASK(15, 0) +#define WDG_UNLOCK_KEY 0xe551 + +struct sprd_adi { + struct spi_controller *ctlr; + struct device *dev; + void __iomem *base; + struct hwspinlock *hwlock; + unsigned long slave_vbase; + unsigned long slave_pbase; + struct notifier_block restart_handler; +}; + +static int sprd_adi_check_paddr(struct sprd_adi *sadi, u32 paddr) +{ + if (paddr < sadi->slave_pbase || paddr > + (sadi->slave_pbase + ADI_SLAVE_ADDR_SIZE)) { + dev_err(sadi->dev, + "slave physical address is incorrect, addr = 0x%x\n", + paddr); + return -EINVAL; + } + + return 0; +} + +static unsigned long sprd_adi_to_vaddr(struct sprd_adi *sadi, u32 paddr) +{ + return (paddr - sadi->slave_pbase + sadi->slave_vbase); +} + +static int sprd_adi_drain_fifo(struct sprd_adi *sadi) +{ + u32 timeout = ADI_FIFO_DRAIN_TIMEOUT; + u32 sts; + + do { + sts = readl_relaxed(sadi->base + REG_ADI_ARM_FIFO_STS); + if (sts & BIT_FIFO_EMPTY) + break; + + cpu_relax(); + } while (--timeout); + + if (timeout == 0) { + dev_err(sadi->dev, "drain write fifo timeout\n"); + return -EBUSY; + } + + return 0; +} + +static int sprd_adi_fifo_is_full(struct sprd_adi *sadi) +{ + return readl_relaxed(sadi->base + REG_ADI_ARM_FIFO_STS) & BIT_FIFO_FULL; +} + +static int sprd_adi_read(struct sprd_adi *sadi, u32 reg_paddr, u32 *read_val) +{ + int read_timeout = ADI_READ_TIMEOUT; + unsigned long flags; + u32 val, rd_addr; + int ret = 0; + + if (sadi->hwlock) { + ret = hwspin_lock_timeout_irqsave(sadi->hwlock, + ADI_HWSPINLOCK_TIMEOUT, + &flags); + if (ret) { + dev_err(sadi->dev, "get the hw lock failed\n"); + return ret; + } + } + + /* + * Set the physical register address need to read into RD_CMD register, + * then ADI controller will start to transfer automatically. + */ + writel_relaxed(reg_paddr, sadi->base + REG_ADI_RD_CMD); + + /* + * Wait read operation complete, the BIT_RD_CMD_BUSY will be set + * simultaneously when writing read command to register, and the + * BIT_RD_CMD_BUSY will be cleared after the read operation is + * completed. + */ + do { + val = readl_relaxed(sadi->base + REG_ADI_RD_DATA); + if (!(val & BIT_RD_CMD_BUSY)) + break; + + cpu_relax(); + } while (--read_timeout); + + if (read_timeout == 0) { + dev_err(sadi->dev, "ADI read timeout\n"); + ret = -EBUSY; + goto out; + } + + /* + * The return value includes data and read register address, from bit 0 + * to bit 15 are data, and from bit 16 to bit 30 are read register + * address. Then we can check the returned register address to validate + * data. + */ + rd_addr = (val & RD_ADDR_MASK ) >> RD_ADDR_SHIFT; + + if (rd_addr != (reg_paddr & REG_ADDR_LOW_MASK)) { + dev_err(sadi->dev, "read error, reg addr = 0x%x, val = 0x%x\n", + reg_paddr, val); + ret = -EIO; + goto out; + } + + *read_val = val & RD_VALUE_MASK; + +out: + if (sadi->hwlock) + hwspin_unlock_irqrestore(sadi->hwlock, &flags); + return ret; +} + +static int sprd_adi_write(struct sprd_adi *sadi, u32 reg_paddr, u32 val) +{ + unsigned long reg = sprd_adi_to_vaddr(sadi, reg_paddr); + u32 timeout = ADI_FIFO_DRAIN_TIMEOUT; + unsigned long flags; + int ret; + + if (sadi->hwlock) { + ret = hwspin_lock_timeout_irqsave(sadi->hwlock, + ADI_HWSPINLOCK_TIMEOUT, + &flags); + if (ret) { + dev_err(sadi->dev, "get the hw lock failed\n"); + return ret; + } + } + + ret = sprd_adi_drain_fifo(sadi); + if (ret < 0) + goto out; + + /* + * we should wait for write fifo is empty before writing data to PMIC + * registers. + */ + do { + if (!sprd_adi_fifo_is_full(sadi)) { + writel_relaxed(val, (void __iomem *)reg); + break; + } + + cpu_relax(); + } while (--timeout); + + if (timeout == 0) { + dev_err(sadi->dev, "write fifo is full\n"); + ret = -EBUSY; + } + +out: + if (sadi->hwlock) + hwspin_unlock_irqrestore(sadi->hwlock, &flags); + return ret; +} + +static int sprd_adi_transfer_one(struct spi_controller *ctlr, + struct spi_device *spi_dev, + struct spi_transfer *t) +{ + struct sprd_adi *sadi = spi_controller_get_devdata(ctlr); + u32 phy_reg, val; + int ret; + + if (t->rx_buf) { + phy_reg = *(u32 *)t->rx_buf + sadi->slave_pbase; + + ret = sprd_adi_check_paddr(sadi, phy_reg); + if (ret) + return ret; + + ret = sprd_adi_read(sadi, phy_reg, &val); + if (ret) + return ret; + + *(u32 *)t->rx_buf = val; + } else if (t->tx_buf) { + u32 *p = (u32 *)t->tx_buf; + + /* + * Get the physical register address need to write and convert + * the physical address to virtual address. Since we need + * virtual register address to write. + */ + phy_reg = *p++ + sadi->slave_pbase; + ret = sprd_adi_check_paddr(sadi, phy_reg); + if (ret) + return ret; + + val = *p; + ret = sprd_adi_write(sadi, phy_reg, val); + if (ret) + return ret; + } else { + dev_err(sadi->dev, "no buffer for transfer\n"); + return -EINVAL; + } + + return 0; +} + +static void sprd_adi_set_wdt_rst_mode(struct sprd_adi *sadi) +{ +#if IS_ENABLED(CONFIG_SPRD_WATCHDOG) + u32 val; + + /* Set default watchdog reboot mode */ + sprd_adi_read(sadi, sadi->slave_pbase + PMIC_RST_STATUS, &val); + val |= HWRST_STATUS_WATCHDOG; + sprd_adi_write(sadi, sadi->slave_pbase + PMIC_RST_STATUS, val); +#endif +} + +static int sprd_adi_restart_handler(struct notifier_block *this, + unsigned long mode, void *cmd) +{ + struct sprd_adi *sadi = container_of(this, struct sprd_adi, + restart_handler); + u32 val, reboot_mode = 0; + + if (!cmd) + reboot_mode = HWRST_STATUS_NORMAL; + else if (!strncmp(cmd, "recovery", 8)) + reboot_mode = HWRST_STATUS_RECOVERY; + else if (!strncmp(cmd, "alarm", 5)) + reboot_mode = HWRST_STATUS_ALARM; + else if (!strncmp(cmd, "fastsleep", 9)) + reboot_mode = HWRST_STATUS_SLEEP; + else if (!strncmp(cmd, "bootloader", 10)) + reboot_mode = HWRST_STATUS_FASTBOOT; + else if (!strncmp(cmd, "panic", 5)) + reboot_mode = HWRST_STATUS_PANIC; + else if (!strncmp(cmd, "special", 7)) + reboot_mode = HWRST_STATUS_SPECIAL; + else if (!strncmp(cmd, "cftreboot", 9)) + reboot_mode = HWRST_STATUS_CFTREBOOT; + else if (!strncmp(cmd, "autodloader", 11)) + reboot_mode = HWRST_STATUS_AUTODLOADER; + else if (!strncmp(cmd, "iqmode", 6)) + reboot_mode = HWRST_STATUS_IQMODE; + else if (!strncmp(cmd, "sprdisk", 7)) + reboot_mode = HWRST_STATUS_SPRDISK; + else if (!strncmp(cmd, "tospanic", 8)) + reboot_mode = HWRST_STATUS_SECURITY; + else if (!strncmp(cmd, "factorytest", 11)) + reboot_mode = HWRST_STATUS_FACTORYTEST; + else + reboot_mode = HWRST_STATUS_NORMAL; + + /* Record the reboot mode */ + sprd_adi_read(sadi, sadi->slave_pbase + PMIC_RST_STATUS, &val); + val &= ~HWRST_STATUS_WATCHDOG; + val |= reboot_mode; + sprd_adi_write(sadi, sadi->slave_pbase + PMIC_RST_STATUS, val); + + /* Enable the interface clock of the watchdog */ + sprd_adi_read(sadi, sadi->slave_pbase + PMIC_MODULE_EN, &val); + val |= BIT_WDG_EN; + sprd_adi_write(sadi, sadi->slave_pbase + PMIC_MODULE_EN, val); + + /* Enable the work clock of the watchdog */ + sprd_adi_read(sadi, sadi->slave_pbase + PMIC_CLK_EN, &val); + val |= BIT_WDG_EN; + sprd_adi_write(sadi, sadi->slave_pbase + PMIC_CLK_EN, val); + + /* Unlock the watchdog */ + sprd_adi_write(sadi, sadi->slave_pbase + REG_WDG_LOCK, WDG_UNLOCK_KEY); + + sprd_adi_read(sadi, sadi->slave_pbase + REG_WDG_CTRL, &val); + val |= BIT_WDG_NEW; + sprd_adi_write(sadi, sadi->slave_pbase + REG_WDG_CTRL, val); + + /* Load the watchdog timeout value, 50ms is always enough. */ + sprd_adi_write(sadi, sadi->slave_pbase + REG_WDG_LOAD_HIGH, 0); + sprd_adi_write(sadi, sadi->slave_pbase + REG_WDG_LOAD_LOW, + WDG_LOAD_VAL & WDG_LOAD_MASK); + + /* Start the watchdog to reset system */ + sprd_adi_read(sadi, sadi->slave_pbase + REG_WDG_CTRL, &val); + val |= BIT_WDG_RUN | BIT_WDG_RST; + sprd_adi_write(sadi, sadi->slave_pbase + REG_WDG_CTRL, val); + + /* Lock the watchdog */ + sprd_adi_write(sadi, sadi->slave_pbase + REG_WDG_LOCK, ~WDG_UNLOCK_KEY); + + mdelay(1000); + + dev_emerg(sadi->dev, "Unable to restart system\n"); + return NOTIFY_DONE; +} + +static void sprd_adi_hw_init(struct sprd_adi *sadi) +{ + struct device_node *np = sadi->dev->of_node; + int i, size, chn_cnt; + const __be32 *list; + u32 tmp; + + /* Set all channels as default priority */ + writel_relaxed(0, sadi->base + REG_ADI_CHN_PRIL); + writel_relaxed(0, sadi->base + REG_ADI_CHN_PRIH); + + /* Set clock auto gate mode */ + tmp = readl_relaxed(sadi->base + REG_ADI_GSSI_CFG0); + tmp &= ~BIT_CLK_ALL_ON; + writel_relaxed(tmp, sadi->base + REG_ADI_GSSI_CFG0); + + /* Set hardware channels setting */ + list = of_get_property(np, "sprd,hw-channels", &size); + if (!list || !size) { + dev_info(sadi->dev, "no hw channels setting in node\n"); + return; + } + + chn_cnt = size / 8; + for (i = 0; i < chn_cnt; i++) { + u32 value; + u32 chn_id = be32_to_cpu(*list++); + u32 chn_config = be32_to_cpu(*list++); + + /* Channel 0 and 1 are software channels */ + if (chn_id < 2) + continue; + + writel_relaxed(chn_config, sadi->base + + REG_ADI_CHN_ADDR(chn_id)); + + if (chn_id < 32) { + value = readl_relaxed(sadi->base + REG_ADI_CHN_EN); + value |= BIT(chn_id); + writel_relaxed(value, sadi->base + REG_ADI_CHN_EN); + } else if (chn_id < ADI_HW_CHNS) { + value = readl_relaxed(sadi->base + REG_ADI_CHN_EN1); + value |= BIT(chn_id - 32); + writel_relaxed(value, sadi->base + REG_ADI_CHN_EN1); + } + } +} + +static int sprd_adi_probe(struct platform_device *pdev) +{ + struct device_node *np = pdev->dev.of_node; + struct spi_controller *ctlr; + struct sprd_adi *sadi; + struct resource *res; + u32 num_chipselect; + int ret; + + if (!np) { + dev_err(&pdev->dev, "can not find the adi bus node\n"); + return -ENODEV; + } + + pdev->id = of_alias_get_id(np, "spi"); + num_chipselect = of_get_child_count(np); + + ctlr = spi_alloc_master(&pdev->dev, sizeof(struct sprd_adi)); + if (!ctlr) + return -ENOMEM; + + dev_set_drvdata(&pdev->dev, ctlr); + sadi = spi_controller_get_devdata(ctlr); + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + sadi->base = devm_ioremap_resource(&pdev->dev, res); + if (IS_ERR(sadi->base)) { + ret = PTR_ERR(sadi->base); + goto put_ctlr; + } + + sadi->slave_vbase = (unsigned long)sadi->base + ADI_SLAVE_OFFSET; + sadi->slave_pbase = res->start + ADI_SLAVE_OFFSET; + sadi->ctlr = ctlr; + sadi->dev = &pdev->dev; + ret = of_hwspin_lock_get_id(np, 0); + if (ret > 0 || (IS_ENABLED(CONFIG_HWSPINLOCK) && ret == 0)) { + sadi->hwlock = + devm_hwspin_lock_request_specific(&pdev->dev, ret); + if (!sadi->hwlock) { + ret = -ENXIO; + goto put_ctlr; + } + } else { + switch (ret) { + case -ENOENT: + dev_info(&pdev->dev, "no hardware spinlock supplied\n"); + break; + default: + dev_err_probe(&pdev->dev, ret, "failed to find hwlock id\n"); + goto put_ctlr; + } + } + + sprd_adi_hw_init(sadi); + sprd_adi_set_wdt_rst_mode(sadi); + + ctlr->dev.of_node = pdev->dev.of_node; + ctlr->bus_num = pdev->id; + ctlr->num_chipselect = num_chipselect; + ctlr->flags = SPI_MASTER_HALF_DUPLEX; + ctlr->bits_per_word_mask = 0; + ctlr->transfer_one = sprd_adi_transfer_one; + + ret = devm_spi_register_controller(&pdev->dev, ctlr); + if (ret) { + dev_err(&pdev->dev, "failed to register SPI controller\n"); + goto put_ctlr; + } + + sadi->restart_handler.notifier_call = sprd_adi_restart_handler; + sadi->restart_handler.priority = 128; + ret = register_restart_handler(&sadi->restart_handler); + if (ret) { + dev_err(&pdev->dev, "can not register restart handler\n"); + goto put_ctlr; + } + + return 0; + +put_ctlr: + spi_controller_put(ctlr); + return ret; +} + +static int sprd_adi_remove(struct platform_device *pdev) +{ + struct spi_controller *ctlr = dev_get_drvdata(&pdev->dev); + struct sprd_adi *sadi = spi_controller_get_devdata(ctlr); + + unregister_restart_handler(&sadi->restart_handler); + return 0; +} + +static const struct of_device_id sprd_adi_of_match[] = { + { + .compatible = "sprd,sc9860-adi", + }, + { }, +}; +MODULE_DEVICE_TABLE(of, sprd_adi_of_match); + +static struct platform_driver sprd_adi_driver = { + .driver = { + .name = "sprd-adi", + .of_match_table = sprd_adi_of_match, + }, + .probe = sprd_adi_probe, + .remove = sprd_adi_remove, +}; +module_platform_driver(sprd_adi_driver); + +MODULE_DESCRIPTION("Spreadtrum ADI Controller Driver"); +MODULE_AUTHOR("Baolin Wang <Baolin.Wang@spreadtrum.com>"); +MODULE_LICENSE("GPL v2"); diff --git a/drivers/spi/spi-sprd.c b/drivers/spi/spi-sprd.c new file mode 100644 index 000000000..28e70db9b --- /dev/null +++ b/drivers/spi/spi-sprd.c @@ -0,0 +1,1087 @@ +// SPDX-License-Identifier: GPL-2.0 +// Copyright (C) 2018 Spreadtrum Communications Inc. + +#include <linux/clk.h> +#include <linux/dmaengine.h> +#include <linux/dma-mapping.h> +#include <linux/dma/sprd-dma.h> +#include <linux/interrupt.h> +#include <linux/io.h> +#include <linux/iopoll.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/of.h> +#include <linux/of_device.h> +#include <linux/of_dma.h> +#include <linux/platform_device.h> +#include <linux/pm_runtime.h> +#include <linux/spi/spi.h> + +#define SPRD_SPI_TXD 0x0 +#define SPRD_SPI_CLKD 0x4 +#define SPRD_SPI_CTL0 0x8 +#define SPRD_SPI_CTL1 0xc +#define SPRD_SPI_CTL2 0x10 +#define SPRD_SPI_CTL3 0x14 +#define SPRD_SPI_CTL4 0x18 +#define SPRD_SPI_CTL5 0x1c +#define SPRD_SPI_INT_EN 0x20 +#define SPRD_SPI_INT_CLR 0x24 +#define SPRD_SPI_INT_RAW_STS 0x28 +#define SPRD_SPI_INT_MASK_STS 0x2c +#define SPRD_SPI_STS1 0x30 +#define SPRD_SPI_STS2 0x34 +#define SPRD_SPI_DSP_WAIT 0x38 +#define SPRD_SPI_STS3 0x3c +#define SPRD_SPI_CTL6 0x40 +#define SPRD_SPI_STS4 0x44 +#define SPRD_SPI_FIFO_RST 0x48 +#define SPRD_SPI_CTL7 0x4c +#define SPRD_SPI_STS5 0x50 +#define SPRD_SPI_CTL8 0x54 +#define SPRD_SPI_CTL9 0x58 +#define SPRD_SPI_CTL10 0x5c +#define SPRD_SPI_CTL11 0x60 +#define SPRD_SPI_CTL12 0x64 +#define SPRD_SPI_STS6 0x68 +#define SPRD_SPI_STS7 0x6c +#define SPRD_SPI_STS8 0x70 +#define SPRD_SPI_STS9 0x74 + +/* Bits & mask definition for register CTL0 */ +#define SPRD_SPI_SCK_REV BIT(13) +#define SPRD_SPI_NG_TX BIT(1) +#define SPRD_SPI_NG_RX BIT(0) +#define SPRD_SPI_CHNL_LEN_MASK GENMASK(4, 0) +#define SPRD_SPI_CSN_MASK GENMASK(11, 8) +#define SPRD_SPI_CS0_VALID BIT(8) + +/* Bits & mask definition for register SPI_INT_EN */ +#define SPRD_SPI_TX_END_INT_EN BIT(8) +#define SPRD_SPI_RX_END_INT_EN BIT(9) + +/* Bits & mask definition for register SPI_INT_RAW_STS */ +#define SPRD_SPI_TX_END_RAW BIT(8) +#define SPRD_SPI_RX_END_RAW BIT(9) + +/* Bits & mask definition for register SPI_INT_CLR */ +#define SPRD_SPI_TX_END_CLR BIT(8) +#define SPRD_SPI_RX_END_CLR BIT(9) + +/* Bits & mask definition for register INT_MASK_STS */ +#define SPRD_SPI_MASK_RX_END BIT(9) +#define SPRD_SPI_MASK_TX_END BIT(8) + +/* Bits & mask definition for register STS2 */ +#define SPRD_SPI_TX_BUSY BIT(8) + +/* Bits & mask definition for register CTL1 */ +#define SPRD_SPI_RX_MODE BIT(12) +#define SPRD_SPI_TX_MODE BIT(13) +#define SPRD_SPI_RTX_MD_MASK GENMASK(13, 12) + +/* Bits & mask definition for register CTL2 */ +#define SPRD_SPI_DMA_EN BIT(6) + +/* Bits & mask definition for register CTL4 */ +#define SPRD_SPI_START_RX BIT(9) +#define SPRD_SPI_ONLY_RECV_MASK GENMASK(8, 0) + +/* Bits & mask definition for register SPI_INT_CLR */ +#define SPRD_SPI_RX_END_INT_CLR BIT(9) +#define SPRD_SPI_TX_END_INT_CLR BIT(8) + +/* Bits & mask definition for register SPI_INT_RAW */ +#define SPRD_SPI_RX_END_IRQ BIT(9) +#define SPRD_SPI_TX_END_IRQ BIT(8) + +/* Bits & mask definition for register CTL12 */ +#define SPRD_SPI_SW_RX_REQ BIT(0) +#define SPRD_SPI_SW_TX_REQ BIT(1) + +/* Bits & mask definition for register CTL7 */ +#define SPRD_SPI_DATA_LINE2_EN BIT(15) +#define SPRD_SPI_MODE_MASK GENMASK(5, 3) +#define SPRD_SPI_MODE_OFFSET 3 +#define SPRD_SPI_3WIRE_MODE 4 +#define SPRD_SPI_4WIRE_MODE 0 + +/* Bits & mask definition for register CTL8 */ +#define SPRD_SPI_TX_MAX_LEN_MASK GENMASK(19, 0) +#define SPRD_SPI_TX_LEN_H_MASK GENMASK(3, 0) +#define SPRD_SPI_TX_LEN_H_OFFSET 16 + +/* Bits & mask definition for register CTL9 */ +#define SPRD_SPI_TX_LEN_L_MASK GENMASK(15, 0) + +/* Bits & mask definition for register CTL10 */ +#define SPRD_SPI_RX_MAX_LEN_MASK GENMASK(19, 0) +#define SPRD_SPI_RX_LEN_H_MASK GENMASK(3, 0) +#define SPRD_SPI_RX_LEN_H_OFFSET 16 + +/* Bits & mask definition for register CTL11 */ +#define SPRD_SPI_RX_LEN_L_MASK GENMASK(15, 0) + +/* Default & maximum word delay cycles */ +#define SPRD_SPI_MIN_DELAY_CYCLE 14 +#define SPRD_SPI_MAX_DELAY_CYCLE 130 + +#define SPRD_SPI_FIFO_SIZE 32 +#define SPRD_SPI_CHIP_CS_NUM 0x4 +#define SPRD_SPI_CHNL_LEN 2 +#define SPRD_SPI_DEFAULT_SOURCE 26000000 +#define SPRD_SPI_MAX_SPEED_HZ 48000000 +#define SPRD_SPI_AUTOSUSPEND_DELAY 100 +#define SPRD_SPI_DMA_STEP 8 + +enum sprd_spi_dma_channel { + SPRD_SPI_RX, + SPRD_SPI_TX, + SPRD_SPI_MAX, +}; + +struct sprd_spi_dma { + bool enable; + struct dma_chan *dma_chan[SPRD_SPI_MAX]; + enum dma_slave_buswidth width; + u32 fragmens_len; + u32 rx_len; +}; + +struct sprd_spi { + void __iomem *base; + phys_addr_t phy_base; + struct device *dev; + struct clk *clk; + int irq; + u32 src_clk; + u32 hw_mode; + u32 trans_len; + u32 trans_mode; + u32 word_delay; + u32 hw_speed_hz; + u32 len; + int status; + struct sprd_spi_dma dma; + struct completion xfer_completion; + const void *tx_buf; + void *rx_buf; + int (*read_bufs)(struct sprd_spi *ss, u32 len); + int (*write_bufs)(struct sprd_spi *ss, u32 len); +}; + +static u32 sprd_spi_transfer_max_timeout(struct sprd_spi *ss, + struct spi_transfer *t) +{ + /* + * The time spent on transmission of the full FIFO data is the maximum + * SPI transmission time. + */ + u32 size = t->bits_per_word * SPRD_SPI_FIFO_SIZE; + u32 bit_time_us = DIV_ROUND_UP(USEC_PER_SEC, ss->hw_speed_hz); + u32 total_time_us = size * bit_time_us; + /* + * There is an interval between data and the data in our SPI hardware, + * so the total transmission time need add the interval time. + */ + u32 interval_cycle = SPRD_SPI_FIFO_SIZE * ss->word_delay; + u32 interval_time_us = DIV_ROUND_UP(interval_cycle * USEC_PER_SEC, + ss->src_clk); + + return total_time_us + interval_time_us; +} + +static int sprd_spi_wait_for_tx_end(struct sprd_spi *ss, struct spi_transfer *t) +{ + u32 val, us; + int ret; + + us = sprd_spi_transfer_max_timeout(ss, t); + ret = readl_relaxed_poll_timeout(ss->base + SPRD_SPI_INT_RAW_STS, val, + val & SPRD_SPI_TX_END_IRQ, 0, us); + if (ret) { + dev_err(ss->dev, "SPI error, spi send timeout!\n"); + return ret; + } + + ret = readl_relaxed_poll_timeout(ss->base + SPRD_SPI_STS2, val, + !(val & SPRD_SPI_TX_BUSY), 0, us); + if (ret) { + dev_err(ss->dev, "SPI error, spi busy timeout!\n"); + return ret; + } + + writel_relaxed(SPRD_SPI_TX_END_INT_CLR, ss->base + SPRD_SPI_INT_CLR); + + return 0; +} + +static int sprd_spi_wait_for_rx_end(struct sprd_spi *ss, struct spi_transfer *t) +{ + u32 val, us; + int ret; + + us = sprd_spi_transfer_max_timeout(ss, t); + ret = readl_relaxed_poll_timeout(ss->base + SPRD_SPI_INT_RAW_STS, val, + val & SPRD_SPI_RX_END_IRQ, 0, us); + if (ret) { + dev_err(ss->dev, "SPI error, spi rx timeout!\n"); + return ret; + } + + writel_relaxed(SPRD_SPI_RX_END_INT_CLR, ss->base + SPRD_SPI_INT_CLR); + + return 0; +} + +static void sprd_spi_tx_req(struct sprd_spi *ss) +{ + writel_relaxed(SPRD_SPI_SW_TX_REQ, ss->base + SPRD_SPI_CTL12); +} + +static void sprd_spi_rx_req(struct sprd_spi *ss) +{ + writel_relaxed(SPRD_SPI_SW_RX_REQ, ss->base + SPRD_SPI_CTL12); +} + +static void sprd_spi_enter_idle(struct sprd_spi *ss) +{ + u32 val = readl_relaxed(ss->base + SPRD_SPI_CTL1); + + val &= ~SPRD_SPI_RTX_MD_MASK; + writel_relaxed(val, ss->base + SPRD_SPI_CTL1); +} + +static void sprd_spi_set_transfer_bits(struct sprd_spi *ss, u32 bits) +{ + u32 val = readl_relaxed(ss->base + SPRD_SPI_CTL0); + + /* Set the valid bits for every transaction */ + val &= ~(SPRD_SPI_CHNL_LEN_MASK << SPRD_SPI_CHNL_LEN); + val |= bits << SPRD_SPI_CHNL_LEN; + writel_relaxed(val, ss->base + SPRD_SPI_CTL0); +} + +static void sprd_spi_set_tx_length(struct sprd_spi *ss, u32 length) +{ + u32 val = readl_relaxed(ss->base + SPRD_SPI_CTL8); + + length &= SPRD_SPI_TX_MAX_LEN_MASK; + val &= ~SPRD_SPI_TX_LEN_H_MASK; + val |= length >> SPRD_SPI_TX_LEN_H_OFFSET; + writel_relaxed(val, ss->base + SPRD_SPI_CTL8); + + val = length & SPRD_SPI_TX_LEN_L_MASK; + writel_relaxed(val, ss->base + SPRD_SPI_CTL9); +} + +static void sprd_spi_set_rx_length(struct sprd_spi *ss, u32 length) +{ + u32 val = readl_relaxed(ss->base + SPRD_SPI_CTL10); + + length &= SPRD_SPI_RX_MAX_LEN_MASK; + val &= ~SPRD_SPI_RX_LEN_H_MASK; + val |= length >> SPRD_SPI_RX_LEN_H_OFFSET; + writel_relaxed(val, ss->base + SPRD_SPI_CTL10); + + val = length & SPRD_SPI_RX_LEN_L_MASK; + writel_relaxed(val, ss->base + SPRD_SPI_CTL11); +} + +static void sprd_spi_chipselect(struct spi_device *sdev, bool cs) +{ + struct spi_controller *sctlr = sdev->controller; + struct sprd_spi *ss = spi_controller_get_devdata(sctlr); + u32 val; + + val = readl_relaxed(ss->base + SPRD_SPI_CTL0); + /* The SPI controller will pull down CS pin if cs is 0 */ + if (!cs) { + val &= ~SPRD_SPI_CS0_VALID; + writel_relaxed(val, ss->base + SPRD_SPI_CTL0); + } else { + val |= SPRD_SPI_CSN_MASK; + writel_relaxed(val, ss->base + SPRD_SPI_CTL0); + } +} + +static int sprd_spi_write_only_receive(struct sprd_spi *ss, u32 len) +{ + u32 val; + + /* Clear the start receive bit and reset receive data number */ + val = readl_relaxed(ss->base + SPRD_SPI_CTL4); + val &= ~(SPRD_SPI_START_RX | SPRD_SPI_ONLY_RECV_MASK); + writel_relaxed(val, ss->base + SPRD_SPI_CTL4); + + /* Set the receive data length */ + val = readl_relaxed(ss->base + SPRD_SPI_CTL4); + val |= len & SPRD_SPI_ONLY_RECV_MASK; + writel_relaxed(val, ss->base + SPRD_SPI_CTL4); + + /* Trigger to receive data */ + val = readl_relaxed(ss->base + SPRD_SPI_CTL4); + val |= SPRD_SPI_START_RX; + writel_relaxed(val, ss->base + SPRD_SPI_CTL4); + + return len; +} + +static int sprd_spi_write_bufs_u8(struct sprd_spi *ss, u32 len) +{ + u8 *tx_p = (u8 *)ss->tx_buf; + int i; + + for (i = 0; i < len; i++) + writeb_relaxed(tx_p[i], ss->base + SPRD_SPI_TXD); + + ss->tx_buf += i; + return i; +} + +static int sprd_spi_write_bufs_u16(struct sprd_spi *ss, u32 len) +{ + u16 *tx_p = (u16 *)ss->tx_buf; + int i; + + for (i = 0; i < len; i++) + writew_relaxed(tx_p[i], ss->base + SPRD_SPI_TXD); + + ss->tx_buf += i << 1; + return i << 1; +} + +static int sprd_spi_write_bufs_u32(struct sprd_spi *ss, u32 len) +{ + u32 *tx_p = (u32 *)ss->tx_buf; + int i; + + for (i = 0; i < len; i++) + writel_relaxed(tx_p[i], ss->base + SPRD_SPI_TXD); + + ss->tx_buf += i << 2; + return i << 2; +} + +static int sprd_spi_read_bufs_u8(struct sprd_spi *ss, u32 len) +{ + u8 *rx_p = (u8 *)ss->rx_buf; + int i; + + for (i = 0; i < len; i++) + rx_p[i] = readb_relaxed(ss->base + SPRD_SPI_TXD); + + ss->rx_buf += i; + return i; +} + +static int sprd_spi_read_bufs_u16(struct sprd_spi *ss, u32 len) +{ + u16 *rx_p = (u16 *)ss->rx_buf; + int i; + + for (i = 0; i < len; i++) + rx_p[i] = readw_relaxed(ss->base + SPRD_SPI_TXD); + + ss->rx_buf += i << 1; + return i << 1; +} + +static int sprd_spi_read_bufs_u32(struct sprd_spi *ss, u32 len) +{ + u32 *rx_p = (u32 *)ss->rx_buf; + int i; + + for (i = 0; i < len; i++) + rx_p[i] = readl_relaxed(ss->base + SPRD_SPI_TXD); + + ss->rx_buf += i << 2; + return i << 2; +} + +static int sprd_spi_txrx_bufs(struct spi_device *sdev, struct spi_transfer *t) +{ + struct sprd_spi *ss = spi_controller_get_devdata(sdev->controller); + u32 trans_len = ss->trans_len, len; + int ret, write_size = 0, read_size = 0; + + while (trans_len) { + len = trans_len > SPRD_SPI_FIFO_SIZE ? SPRD_SPI_FIFO_SIZE : + trans_len; + if (ss->trans_mode & SPRD_SPI_TX_MODE) { + sprd_spi_set_tx_length(ss, len); + write_size += ss->write_bufs(ss, len); + + /* + * For our 3 wires mode or dual TX line mode, we need + * to request the controller to transfer. + */ + if (ss->hw_mode & SPI_3WIRE || ss->hw_mode & SPI_TX_DUAL) + sprd_spi_tx_req(ss); + + ret = sprd_spi_wait_for_tx_end(ss, t); + } else { + sprd_spi_set_rx_length(ss, len); + + /* + * For our 3 wires mode or dual TX line mode, we need + * to request the controller to read. + */ + if (ss->hw_mode & SPI_3WIRE || ss->hw_mode & SPI_TX_DUAL) + sprd_spi_rx_req(ss); + else + write_size += ss->write_bufs(ss, len); + + ret = sprd_spi_wait_for_rx_end(ss, t); + } + + if (ret) + goto complete; + + if (ss->trans_mode & SPRD_SPI_RX_MODE) + read_size += ss->read_bufs(ss, len); + + trans_len -= len; + } + + if (ss->trans_mode & SPRD_SPI_TX_MODE) + ret = write_size; + else + ret = read_size; +complete: + sprd_spi_enter_idle(ss); + + return ret; +} + +static void sprd_spi_irq_enable(struct sprd_spi *ss) +{ + u32 val; + + /* Clear interrupt status before enabling interrupt. */ + writel_relaxed(SPRD_SPI_TX_END_CLR | SPRD_SPI_RX_END_CLR, + ss->base + SPRD_SPI_INT_CLR); + /* Enable SPI interrupt only in DMA mode. */ + val = readl_relaxed(ss->base + SPRD_SPI_INT_EN); + writel_relaxed(val | SPRD_SPI_TX_END_INT_EN | + SPRD_SPI_RX_END_INT_EN, + ss->base + SPRD_SPI_INT_EN); +} + +static void sprd_spi_irq_disable(struct sprd_spi *ss) +{ + writel_relaxed(0, ss->base + SPRD_SPI_INT_EN); +} + +static void sprd_spi_dma_enable(struct sprd_spi *ss, bool enable) +{ + u32 val = readl_relaxed(ss->base + SPRD_SPI_CTL2); + + if (enable) + val |= SPRD_SPI_DMA_EN; + else + val &= ~SPRD_SPI_DMA_EN; + + writel_relaxed(val, ss->base + SPRD_SPI_CTL2); +} + +static int sprd_spi_dma_submit(struct dma_chan *dma_chan, + struct dma_slave_config *c, + struct sg_table *sg, + enum dma_transfer_direction dir) +{ + struct dma_async_tx_descriptor *desc; + dma_cookie_t cookie; + unsigned long flags; + int ret; + + ret = dmaengine_slave_config(dma_chan, c); + if (ret < 0) + return ret; + + flags = SPRD_DMA_FLAGS(SPRD_DMA_CHN_MODE_NONE, SPRD_DMA_NO_TRG, + SPRD_DMA_FRAG_REQ, SPRD_DMA_TRANS_INT); + desc = dmaengine_prep_slave_sg(dma_chan, sg->sgl, sg->nents, dir, flags); + if (!desc) + return -ENODEV; + + cookie = dmaengine_submit(desc); + if (dma_submit_error(cookie)) + return dma_submit_error(cookie); + + dma_async_issue_pending(dma_chan); + + return 0; +} + +static int sprd_spi_dma_rx_config(struct sprd_spi *ss, struct spi_transfer *t) +{ + struct dma_chan *dma_chan = ss->dma.dma_chan[SPRD_SPI_RX]; + struct dma_slave_config config = { + .src_addr = ss->phy_base, + .src_addr_width = ss->dma.width, + .dst_addr_width = ss->dma.width, + .dst_maxburst = ss->dma.fragmens_len, + }; + int ret; + + ret = sprd_spi_dma_submit(dma_chan, &config, &t->rx_sg, DMA_DEV_TO_MEM); + if (ret) + return ret; + + return ss->dma.rx_len; +} + +static int sprd_spi_dma_tx_config(struct sprd_spi *ss, struct spi_transfer *t) +{ + struct dma_chan *dma_chan = ss->dma.dma_chan[SPRD_SPI_TX]; + struct dma_slave_config config = { + .dst_addr = ss->phy_base, + .src_addr_width = ss->dma.width, + .dst_addr_width = ss->dma.width, + .src_maxburst = ss->dma.fragmens_len, + }; + int ret; + + ret = sprd_spi_dma_submit(dma_chan, &config, &t->tx_sg, DMA_MEM_TO_DEV); + if (ret) + return ret; + + return t->len; +} + +static int sprd_spi_dma_request(struct sprd_spi *ss) +{ + ss->dma.dma_chan[SPRD_SPI_RX] = dma_request_chan(ss->dev, "rx_chn"); + if (IS_ERR_OR_NULL(ss->dma.dma_chan[SPRD_SPI_RX])) + return dev_err_probe(ss->dev, PTR_ERR(ss->dma.dma_chan[SPRD_SPI_RX]), + "request RX DMA channel failed!\n"); + + ss->dma.dma_chan[SPRD_SPI_TX] = dma_request_chan(ss->dev, "tx_chn"); + if (IS_ERR_OR_NULL(ss->dma.dma_chan[SPRD_SPI_TX])) { + dma_release_channel(ss->dma.dma_chan[SPRD_SPI_RX]); + return dev_err_probe(ss->dev, PTR_ERR(ss->dma.dma_chan[SPRD_SPI_TX]), + "request TX DMA channel failed!\n"); + } + + return 0; +} + +static void sprd_spi_dma_release(struct sprd_spi *ss) +{ + if (ss->dma.dma_chan[SPRD_SPI_RX]) + dma_release_channel(ss->dma.dma_chan[SPRD_SPI_RX]); + + if (ss->dma.dma_chan[SPRD_SPI_TX]) + dma_release_channel(ss->dma.dma_chan[SPRD_SPI_TX]); +} + +static int sprd_spi_dma_txrx_bufs(struct spi_device *sdev, + struct spi_transfer *t) +{ + struct sprd_spi *ss = spi_master_get_devdata(sdev->master); + u32 trans_len = ss->trans_len; + int ret, write_size = 0; + + reinit_completion(&ss->xfer_completion); + sprd_spi_irq_enable(ss); + if (ss->trans_mode & SPRD_SPI_TX_MODE) { + write_size = sprd_spi_dma_tx_config(ss, t); + sprd_spi_set_tx_length(ss, trans_len); + + /* + * For our 3 wires mode or dual TX line mode, we need + * to request the controller to transfer. + */ + if (ss->hw_mode & SPI_3WIRE || ss->hw_mode & SPI_TX_DUAL) + sprd_spi_tx_req(ss); + } else { + sprd_spi_set_rx_length(ss, trans_len); + + /* + * For our 3 wires mode or dual TX line mode, we need + * to request the controller to read. + */ + if (ss->hw_mode & SPI_3WIRE || ss->hw_mode & SPI_TX_DUAL) + sprd_spi_rx_req(ss); + else + write_size = ss->write_bufs(ss, trans_len); + } + + if (write_size < 0) { + ret = write_size; + dev_err(ss->dev, "failed to write, ret = %d\n", ret); + goto trans_complete; + } + + if (ss->trans_mode & SPRD_SPI_RX_MODE) { + /* + * Set up the DMA receive data length, which must be an + * integral multiple of fragment length. But when the length + * of received data is less than fragment length, DMA can be + * configured to receive data according to the actual length + * of received data. + */ + ss->dma.rx_len = t->len > ss->dma.fragmens_len ? + (t->len - t->len % ss->dma.fragmens_len) : + t->len; + ret = sprd_spi_dma_rx_config(ss, t); + if (ret < 0) { + dev_err(&sdev->dev, + "failed to configure rx DMA, ret = %d\n", ret); + goto trans_complete; + } + } + + sprd_spi_dma_enable(ss, true); + wait_for_completion(&(ss->xfer_completion)); + + if (ss->trans_mode & SPRD_SPI_TX_MODE) + ret = write_size; + else + ret = ss->dma.rx_len; + +trans_complete: + sprd_spi_dma_enable(ss, false); + sprd_spi_enter_idle(ss); + sprd_spi_irq_disable(ss); + + return ret; +} + +static void sprd_spi_set_speed(struct sprd_spi *ss, u32 speed_hz) +{ + /* + * From SPI datasheet, the prescale calculation formula: + * prescale = SPI source clock / (2 * SPI_freq) - 1; + */ + u32 clk_div = DIV_ROUND_UP(ss->src_clk, speed_hz << 1) - 1; + + /* Save the real hardware speed */ + ss->hw_speed_hz = (ss->src_clk >> 1) / (clk_div + 1); + writel_relaxed(clk_div, ss->base + SPRD_SPI_CLKD); +} + +static int sprd_spi_init_hw(struct sprd_spi *ss, struct spi_transfer *t) +{ + struct spi_delay *d = &t->word_delay; + u16 word_delay, interval; + u32 val; + + if (d->unit != SPI_DELAY_UNIT_SCK) + return -EINVAL; + + val = readl_relaxed(ss->base + SPRD_SPI_CTL0); + val &= ~(SPRD_SPI_SCK_REV | SPRD_SPI_NG_TX | SPRD_SPI_NG_RX); + /* Set default chip selection, clock phase and clock polarity */ + val |= ss->hw_mode & SPI_CPHA ? SPRD_SPI_NG_RX : SPRD_SPI_NG_TX; + val |= ss->hw_mode & SPI_CPOL ? SPRD_SPI_SCK_REV : 0; + writel_relaxed(val, ss->base + SPRD_SPI_CTL0); + + /* + * Set the intervals of two SPI frames, and the inteval calculation + * formula as below per datasheet: + * interval time (source clock cycles) = interval * 4 + 10. + */ + word_delay = clamp_t(u16, d->value, SPRD_SPI_MIN_DELAY_CYCLE, + SPRD_SPI_MAX_DELAY_CYCLE); + interval = DIV_ROUND_UP(word_delay - 10, 4); + ss->word_delay = interval * 4 + 10; + writel_relaxed(interval, ss->base + SPRD_SPI_CTL5); + + /* Reset SPI fifo */ + writel_relaxed(1, ss->base + SPRD_SPI_FIFO_RST); + writel_relaxed(0, ss->base + SPRD_SPI_FIFO_RST); + + /* Set SPI work mode */ + val = readl_relaxed(ss->base + SPRD_SPI_CTL7); + val &= ~SPRD_SPI_MODE_MASK; + + if (ss->hw_mode & SPI_3WIRE) + val |= SPRD_SPI_3WIRE_MODE << SPRD_SPI_MODE_OFFSET; + else + val |= SPRD_SPI_4WIRE_MODE << SPRD_SPI_MODE_OFFSET; + + if (ss->hw_mode & SPI_TX_DUAL) + val |= SPRD_SPI_DATA_LINE2_EN; + else + val &= ~SPRD_SPI_DATA_LINE2_EN; + + writel_relaxed(val, ss->base + SPRD_SPI_CTL7); + + return 0; +} + +static int sprd_spi_setup_transfer(struct spi_device *sdev, + struct spi_transfer *t) +{ + struct sprd_spi *ss = spi_controller_get_devdata(sdev->controller); + u8 bits_per_word = t->bits_per_word; + u32 val, mode = 0; + int ret; + + ss->len = t->len; + ss->tx_buf = t->tx_buf; + ss->rx_buf = t->rx_buf; + + ss->hw_mode = sdev->mode; + ret = sprd_spi_init_hw(ss, t); + if (ret) + return ret; + + /* Set tansfer speed and valid bits */ + sprd_spi_set_speed(ss, t->speed_hz); + sprd_spi_set_transfer_bits(ss, bits_per_word); + + if (bits_per_word > 16) + bits_per_word = round_up(bits_per_word, 16); + else + bits_per_word = round_up(bits_per_word, 8); + + switch (bits_per_word) { + case 8: + ss->trans_len = t->len; + ss->read_bufs = sprd_spi_read_bufs_u8; + ss->write_bufs = sprd_spi_write_bufs_u8; + ss->dma.width = DMA_SLAVE_BUSWIDTH_1_BYTE; + ss->dma.fragmens_len = SPRD_SPI_DMA_STEP; + break; + case 16: + ss->trans_len = t->len >> 1; + ss->read_bufs = sprd_spi_read_bufs_u16; + ss->write_bufs = sprd_spi_write_bufs_u16; + ss->dma.width = DMA_SLAVE_BUSWIDTH_2_BYTES; + ss->dma.fragmens_len = SPRD_SPI_DMA_STEP << 1; + break; + case 32: + ss->trans_len = t->len >> 2; + ss->read_bufs = sprd_spi_read_bufs_u32; + ss->write_bufs = sprd_spi_write_bufs_u32; + ss->dma.width = DMA_SLAVE_BUSWIDTH_4_BYTES; + ss->dma.fragmens_len = SPRD_SPI_DMA_STEP << 2; + break; + default: + return -EINVAL; + } + + /* Set transfer read or write mode */ + val = readl_relaxed(ss->base + SPRD_SPI_CTL1); + val &= ~SPRD_SPI_RTX_MD_MASK; + if (t->tx_buf) + mode |= SPRD_SPI_TX_MODE; + if (t->rx_buf) + mode |= SPRD_SPI_RX_MODE; + + writel_relaxed(val | mode, ss->base + SPRD_SPI_CTL1); + + ss->trans_mode = mode; + + /* + * If in only receive mode, we need to trigger the SPI controller to + * receive data automatically. + */ + if (ss->trans_mode == SPRD_SPI_RX_MODE) + ss->write_bufs = sprd_spi_write_only_receive; + + return 0; +} + +static int sprd_spi_transfer_one(struct spi_controller *sctlr, + struct spi_device *sdev, + struct spi_transfer *t) +{ + int ret; + + ret = sprd_spi_setup_transfer(sdev, t); + if (ret) + goto setup_err; + + if (sctlr->can_dma(sctlr, sdev, t)) + ret = sprd_spi_dma_txrx_bufs(sdev, t); + else + ret = sprd_spi_txrx_bufs(sdev, t); + + if (ret == t->len) + ret = 0; + else if (ret >= 0) + ret = -EREMOTEIO; + +setup_err: + spi_finalize_current_transfer(sctlr); + + return ret; +} + +static irqreturn_t sprd_spi_handle_irq(int irq, void *data) +{ + struct sprd_spi *ss = (struct sprd_spi *)data; + u32 val = readl_relaxed(ss->base + SPRD_SPI_INT_MASK_STS); + + if (val & SPRD_SPI_MASK_TX_END) { + writel_relaxed(SPRD_SPI_TX_END_CLR, ss->base + SPRD_SPI_INT_CLR); + if (!(ss->trans_mode & SPRD_SPI_RX_MODE)) + complete(&ss->xfer_completion); + + return IRQ_HANDLED; + } + + if (val & SPRD_SPI_MASK_RX_END) { + writel_relaxed(SPRD_SPI_RX_END_CLR, ss->base + SPRD_SPI_INT_CLR); + if (ss->dma.rx_len < ss->len) { + ss->rx_buf += ss->dma.rx_len; + ss->dma.rx_len += + ss->read_bufs(ss, ss->len - ss->dma.rx_len); + } + complete(&ss->xfer_completion); + + return IRQ_HANDLED; + } + + return IRQ_NONE; +} + +static int sprd_spi_irq_init(struct platform_device *pdev, struct sprd_spi *ss) +{ + int ret; + + ss->irq = platform_get_irq(pdev, 0); + if (ss->irq < 0) + return ss->irq; + + ret = devm_request_irq(&pdev->dev, ss->irq, sprd_spi_handle_irq, + 0, pdev->name, ss); + if (ret) + dev_err(&pdev->dev, "failed to request spi irq %d, ret = %d\n", + ss->irq, ret); + + return ret; +} + +static int sprd_spi_clk_init(struct platform_device *pdev, struct sprd_spi *ss) +{ + struct clk *clk_spi, *clk_parent; + + clk_spi = devm_clk_get(&pdev->dev, "spi"); + if (IS_ERR(clk_spi)) { + dev_warn(&pdev->dev, "can't get the spi clock\n"); + clk_spi = NULL; + } + + clk_parent = devm_clk_get(&pdev->dev, "source"); + if (IS_ERR(clk_parent)) { + dev_warn(&pdev->dev, "can't get the source clock\n"); + clk_parent = NULL; + } + + ss->clk = devm_clk_get(&pdev->dev, "enable"); + if (IS_ERR(ss->clk)) { + dev_err(&pdev->dev, "can't get the enable clock\n"); + return PTR_ERR(ss->clk); + } + + if (!clk_set_parent(clk_spi, clk_parent)) + ss->src_clk = clk_get_rate(clk_spi); + else + ss->src_clk = SPRD_SPI_DEFAULT_SOURCE; + + return 0; +} + +static bool sprd_spi_can_dma(struct spi_controller *sctlr, + struct spi_device *spi, struct spi_transfer *t) +{ + struct sprd_spi *ss = spi_controller_get_devdata(sctlr); + + return ss->dma.enable && (t->len > SPRD_SPI_FIFO_SIZE); +} + +static int sprd_spi_dma_init(struct platform_device *pdev, struct sprd_spi *ss) +{ + int ret; + + ret = sprd_spi_dma_request(ss); + if (ret) { + if (ret == -EPROBE_DEFER) + return ret; + + dev_warn(&pdev->dev, + "failed to request dma, enter no dma mode, ret = %d\n", + ret); + + return 0; + } + + ss->dma.enable = true; + + return 0; +} + +static int sprd_spi_probe(struct platform_device *pdev) +{ + struct spi_controller *sctlr; + struct resource *res; + struct sprd_spi *ss; + int ret; + + pdev->id = of_alias_get_id(pdev->dev.of_node, "spi"); + sctlr = spi_alloc_master(&pdev->dev, sizeof(*ss)); + if (!sctlr) + return -ENOMEM; + + ss = spi_controller_get_devdata(sctlr); + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + ss->base = devm_ioremap_resource(&pdev->dev, res); + if (IS_ERR(ss->base)) { + ret = PTR_ERR(ss->base); + goto free_controller; + } + + ss->phy_base = res->start; + ss->dev = &pdev->dev; + sctlr->dev.of_node = pdev->dev.of_node; + sctlr->mode_bits = SPI_CPOL | SPI_CPHA | SPI_3WIRE | SPI_TX_DUAL; + sctlr->bus_num = pdev->id; + sctlr->set_cs = sprd_spi_chipselect; + sctlr->transfer_one = sprd_spi_transfer_one; + sctlr->can_dma = sprd_spi_can_dma; + sctlr->auto_runtime_pm = true; + sctlr->max_speed_hz = min_t(u32, ss->src_clk >> 1, + SPRD_SPI_MAX_SPEED_HZ); + + init_completion(&ss->xfer_completion); + platform_set_drvdata(pdev, sctlr); + ret = sprd_spi_clk_init(pdev, ss); + if (ret) + goto free_controller; + + ret = sprd_spi_irq_init(pdev, ss); + if (ret) + goto free_controller; + + ret = sprd_spi_dma_init(pdev, ss); + if (ret) + goto free_controller; + + ret = clk_prepare_enable(ss->clk); + if (ret) + goto release_dma; + + ret = pm_runtime_set_active(&pdev->dev); + if (ret < 0) + goto disable_clk; + + pm_runtime_set_autosuspend_delay(&pdev->dev, + SPRD_SPI_AUTOSUSPEND_DELAY); + pm_runtime_use_autosuspend(&pdev->dev); + pm_runtime_enable(&pdev->dev); + ret = pm_runtime_get_sync(&pdev->dev); + if (ret < 0) { + dev_err(&pdev->dev, "failed to resume SPI controller\n"); + goto err_rpm_put; + } + + ret = devm_spi_register_controller(&pdev->dev, sctlr); + if (ret) + goto err_rpm_put; + + pm_runtime_mark_last_busy(&pdev->dev); + pm_runtime_put_autosuspend(&pdev->dev); + + return 0; + +err_rpm_put: + pm_runtime_put_noidle(&pdev->dev); + pm_runtime_disable(&pdev->dev); +disable_clk: + clk_disable_unprepare(ss->clk); +release_dma: + sprd_spi_dma_release(ss); +free_controller: + spi_controller_put(sctlr); + + return ret; +} + +static int sprd_spi_remove(struct platform_device *pdev) +{ + struct spi_controller *sctlr = platform_get_drvdata(pdev); + struct sprd_spi *ss = spi_controller_get_devdata(sctlr); + int ret; + + ret = pm_runtime_get_sync(ss->dev); + if (ret < 0) { + pm_runtime_put_noidle(ss->dev); + dev_err(ss->dev, "failed to resume SPI controller\n"); + return ret; + } + + spi_controller_suspend(sctlr); + + if (ss->dma.enable) + sprd_spi_dma_release(ss); + clk_disable_unprepare(ss->clk); + pm_runtime_put_noidle(&pdev->dev); + pm_runtime_disable(&pdev->dev); + + return 0; +} + +static int __maybe_unused sprd_spi_runtime_suspend(struct device *dev) +{ + struct spi_controller *sctlr = dev_get_drvdata(dev); + struct sprd_spi *ss = spi_controller_get_devdata(sctlr); + + if (ss->dma.enable) + sprd_spi_dma_release(ss); + + clk_disable_unprepare(ss->clk); + + return 0; +} + +static int __maybe_unused sprd_spi_runtime_resume(struct device *dev) +{ + struct spi_controller *sctlr = dev_get_drvdata(dev); + struct sprd_spi *ss = spi_controller_get_devdata(sctlr); + int ret; + + ret = clk_prepare_enable(ss->clk); + if (ret) + return ret; + + if (!ss->dma.enable) + return 0; + + ret = sprd_spi_dma_request(ss); + if (ret) + clk_disable_unprepare(ss->clk); + + return ret; +} + +static const struct dev_pm_ops sprd_spi_pm_ops = { + SET_RUNTIME_PM_OPS(sprd_spi_runtime_suspend, + sprd_spi_runtime_resume, NULL) +}; + +static const struct of_device_id sprd_spi_of_match[] = { + { .compatible = "sprd,sc9860-spi", }, + { /* sentinel */ } +}; +MODULE_DEVICE_TABLE(of, sprd_spi_of_match); + +static struct platform_driver sprd_spi_driver = { + .driver = { + .name = "sprd-spi", + .of_match_table = sprd_spi_of_match, + .pm = &sprd_spi_pm_ops, + }, + .probe = sprd_spi_probe, + .remove = sprd_spi_remove, +}; + +module_platform_driver(sprd_spi_driver); + +MODULE_DESCRIPTION("Spreadtrum SPI Controller driver"); +MODULE_AUTHOR("Lanqing Liu <lanqing.liu@spreadtrum.com>"); +MODULE_LICENSE("GPL v2"); diff --git a/drivers/spi/spi-st-ssc4.c b/drivers/spi/spi-st-ssc4.c new file mode 100644 index 000000000..6c44dda9e --- /dev/null +++ b/drivers/spi/spi-st-ssc4.c @@ -0,0 +1,483 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright (c) 2008-2014 STMicroelectronics Limited + * + * Author: Angus Clark <Angus.Clark@st.com> + * Patrice Chotard <patrice.chotard@st.com> + * Lee Jones <lee.jones@linaro.org> + * + * SPI master mode controller driver, used in STMicroelectronics devices. + */ + +#include <linux/clk.h> +#include <linux/delay.h> +#include <linux/interrupt.h> +#include <linux/io.h> +#include <linux/module.h> +#include <linux/pinctrl/consumer.h> +#include <linux/platform_device.h> +#include <linux/of.h> +#include <linux/of_gpio.h> +#include <linux/of_irq.h> +#include <linux/pm_runtime.h> +#include <linux/spi/spi.h> +#include <linux/spi/spi_bitbang.h> + +/* SSC registers */ +#define SSC_BRG 0x000 +#define SSC_TBUF 0x004 +#define SSC_RBUF 0x008 +#define SSC_CTL 0x00C +#define SSC_IEN 0x010 +#define SSC_I2C 0x018 + +/* SSC Control */ +#define SSC_CTL_DATA_WIDTH_9 0x8 +#define SSC_CTL_DATA_WIDTH_MSK 0xf +#define SSC_CTL_BM 0xf +#define SSC_CTL_HB BIT(4) +#define SSC_CTL_PH BIT(5) +#define SSC_CTL_PO BIT(6) +#define SSC_CTL_SR BIT(7) +#define SSC_CTL_MS BIT(8) +#define SSC_CTL_EN BIT(9) +#define SSC_CTL_LPB BIT(10) +#define SSC_CTL_EN_TX_FIFO BIT(11) +#define SSC_CTL_EN_RX_FIFO BIT(12) +#define SSC_CTL_EN_CLST_RX BIT(13) + +/* SSC Interrupt Enable */ +#define SSC_IEN_TEEN BIT(2) + +#define FIFO_SIZE 8 + +struct spi_st { + /* SSC SPI Controller */ + void __iomem *base; + struct clk *clk; + struct device *dev; + + /* SSC SPI current transaction */ + const u8 *tx_ptr; + u8 *rx_ptr; + u16 bytes_per_word; + unsigned int words_remaining; + unsigned int baud; + struct completion done; +}; + +/* Load the TX FIFO */ +static void ssc_write_tx_fifo(struct spi_st *spi_st) +{ + unsigned int count, i; + uint32_t word = 0; + + if (spi_st->words_remaining > FIFO_SIZE) + count = FIFO_SIZE; + else + count = spi_st->words_remaining; + + for (i = 0; i < count; i++) { + if (spi_st->tx_ptr) { + if (spi_st->bytes_per_word == 1) { + word = *spi_st->tx_ptr++; + } else { + word = *spi_st->tx_ptr++; + word = *spi_st->tx_ptr++ | (word << 8); + } + } + writel_relaxed(word, spi_st->base + SSC_TBUF); + } +} + +/* Read the RX FIFO */ +static void ssc_read_rx_fifo(struct spi_st *spi_st) +{ + unsigned int count, i; + uint32_t word = 0; + + if (spi_st->words_remaining > FIFO_SIZE) + count = FIFO_SIZE; + else + count = spi_st->words_remaining; + + for (i = 0; i < count; i++) { + word = readl_relaxed(spi_st->base + SSC_RBUF); + + if (spi_st->rx_ptr) { + if (spi_st->bytes_per_word == 1) { + *spi_st->rx_ptr++ = (uint8_t)word; + } else { + *spi_st->rx_ptr++ = (word >> 8); + *spi_st->rx_ptr++ = word & 0xff; + } + } + } + spi_st->words_remaining -= count; +} + +static int spi_st_transfer_one(struct spi_master *master, + struct spi_device *spi, struct spi_transfer *t) +{ + struct spi_st *spi_st = spi_master_get_devdata(master); + uint32_t ctl = 0; + + /* Setup transfer */ + spi_st->tx_ptr = t->tx_buf; + spi_st->rx_ptr = t->rx_buf; + + if (spi->bits_per_word > 8) { + /* + * Anything greater than 8 bits-per-word requires 2 + * bytes-per-word in the RX/TX buffers + */ + spi_st->bytes_per_word = 2; + spi_st->words_remaining = t->len / 2; + + } else if (spi->bits_per_word == 8 && !(t->len & 0x1)) { + /* + * If transfer is even-length, and 8 bits-per-word, then + * implement as half-length 16 bits-per-word transfer + */ + spi_st->bytes_per_word = 2; + spi_st->words_remaining = t->len / 2; + + /* Set SSC_CTL to 16 bits-per-word */ + ctl = readl_relaxed(spi_st->base + SSC_CTL); + writel_relaxed((ctl | 0xf), spi_st->base + SSC_CTL); + + readl_relaxed(spi_st->base + SSC_RBUF); + + } else { + spi_st->bytes_per_word = 1; + spi_st->words_remaining = t->len; + } + + reinit_completion(&spi_st->done); + + /* Start transfer by writing to the TX FIFO */ + ssc_write_tx_fifo(spi_st); + writel_relaxed(SSC_IEN_TEEN, spi_st->base + SSC_IEN); + + /* Wait for transfer to complete */ + wait_for_completion(&spi_st->done); + + /* Restore SSC_CTL if necessary */ + if (ctl) + writel_relaxed(ctl, spi_st->base + SSC_CTL); + + spi_finalize_current_transfer(spi->master); + + return t->len; +} + +static void spi_st_cleanup(struct spi_device *spi) +{ + gpio_free(spi->cs_gpio); +} + +/* the spi->mode bits understood by this driver: */ +#define MODEBITS (SPI_CPOL | SPI_CPHA | SPI_LSB_FIRST | SPI_LOOP | SPI_CS_HIGH) +static int spi_st_setup(struct spi_device *spi) +{ + struct spi_st *spi_st = spi_master_get_devdata(spi->master); + u32 spi_st_clk, sscbrg, var; + u32 hz = spi->max_speed_hz; + int cs = spi->cs_gpio; + int ret; + + if (!hz) { + dev_err(&spi->dev, "max_speed_hz unspecified\n"); + return -EINVAL; + } + + if (!gpio_is_valid(cs)) { + dev_err(&spi->dev, "%d is not a valid gpio\n", cs); + return -EINVAL; + } + + ret = gpio_request(cs, dev_name(&spi->dev)); + if (ret) { + dev_err(&spi->dev, "could not request gpio:%d\n", cs); + return ret; + } + + ret = gpio_direction_output(cs, spi->mode & SPI_CS_HIGH); + if (ret) + goto out_free_gpio; + + spi_st_clk = clk_get_rate(spi_st->clk); + + /* Set SSC_BRF */ + sscbrg = spi_st_clk / (2 * hz); + if (sscbrg < 0x07 || sscbrg > BIT(16)) { + dev_err(&spi->dev, + "baudrate %d outside valid range %d\n", sscbrg, hz); + ret = -EINVAL; + goto out_free_gpio; + } + + spi_st->baud = spi_st_clk / (2 * sscbrg); + if (sscbrg == BIT(16)) /* 16-bit counter wraps */ + sscbrg = 0x0; + + writel_relaxed(sscbrg, spi_st->base + SSC_BRG); + + dev_dbg(&spi->dev, + "setting baudrate:target= %u hz, actual= %u hz, sscbrg= %u\n", + hz, spi_st->baud, sscbrg); + + /* Set SSC_CTL and enable SSC */ + var = readl_relaxed(spi_st->base + SSC_CTL); + var |= SSC_CTL_MS; + + if (spi->mode & SPI_CPOL) + var |= SSC_CTL_PO; + else + var &= ~SSC_CTL_PO; + + if (spi->mode & SPI_CPHA) + var |= SSC_CTL_PH; + else + var &= ~SSC_CTL_PH; + + if ((spi->mode & SPI_LSB_FIRST) == 0) + var |= SSC_CTL_HB; + else + var &= ~SSC_CTL_HB; + + if (spi->mode & SPI_LOOP) + var |= SSC_CTL_LPB; + else + var &= ~SSC_CTL_LPB; + + var &= ~SSC_CTL_DATA_WIDTH_MSK; + var |= (spi->bits_per_word - 1); + + var |= SSC_CTL_EN_TX_FIFO | SSC_CTL_EN_RX_FIFO; + var |= SSC_CTL_EN; + + writel_relaxed(var, spi_st->base + SSC_CTL); + + /* Clear the status register */ + readl_relaxed(spi_st->base + SSC_RBUF); + + return 0; + +out_free_gpio: + gpio_free(cs); + return ret; +} + +/* Interrupt fired when TX shift register becomes empty */ +static irqreturn_t spi_st_irq(int irq, void *dev_id) +{ + struct spi_st *spi_st = (struct spi_st *)dev_id; + + /* Read RX FIFO */ + ssc_read_rx_fifo(spi_st); + + /* Fill TX FIFO */ + if (spi_st->words_remaining) { + ssc_write_tx_fifo(spi_st); + } else { + /* TX/RX complete */ + writel_relaxed(0x0, spi_st->base + SSC_IEN); + /* + * read SSC_IEN to ensure that this bit is set + * before re-enabling interrupt + */ + readl(spi_st->base + SSC_IEN); + complete(&spi_st->done); + } + + return IRQ_HANDLED; +} + +static int spi_st_probe(struct platform_device *pdev) +{ + struct device_node *np = pdev->dev.of_node; + struct spi_master *master; + struct spi_st *spi_st; + int irq, ret = 0; + u32 var; + + master = spi_alloc_master(&pdev->dev, sizeof(*spi_st)); + if (!master) + return -ENOMEM; + + master->dev.of_node = np; + master->mode_bits = MODEBITS; + master->setup = spi_st_setup; + master->cleanup = spi_st_cleanup; + master->transfer_one = spi_st_transfer_one; + master->bits_per_word_mask = SPI_BPW_MASK(8) | SPI_BPW_MASK(16); + master->auto_runtime_pm = true; + master->bus_num = pdev->id; + spi_st = spi_master_get_devdata(master); + + spi_st->clk = devm_clk_get(&pdev->dev, "ssc"); + if (IS_ERR(spi_st->clk)) { + dev_err(&pdev->dev, "Unable to request clock\n"); + ret = PTR_ERR(spi_st->clk); + goto put_master; + } + + ret = clk_prepare_enable(spi_st->clk); + if (ret) + goto put_master; + + init_completion(&spi_st->done); + + /* Get resources */ + spi_st->base = devm_platform_ioremap_resource(pdev, 0); + if (IS_ERR(spi_st->base)) { + ret = PTR_ERR(spi_st->base); + goto clk_disable; + } + + /* Disable I2C and Reset SSC */ + writel_relaxed(0x0, spi_st->base + SSC_I2C); + var = readw_relaxed(spi_st->base + SSC_CTL); + var |= SSC_CTL_SR; + writel_relaxed(var, spi_st->base + SSC_CTL); + + udelay(1); + var = readl_relaxed(spi_st->base + SSC_CTL); + var &= ~SSC_CTL_SR; + writel_relaxed(var, spi_st->base + SSC_CTL); + + /* Set SSC into slave mode before reconfiguring PIO pins */ + var = readl_relaxed(spi_st->base + SSC_CTL); + var &= ~SSC_CTL_MS; + writel_relaxed(var, spi_st->base + SSC_CTL); + + irq = irq_of_parse_and_map(np, 0); + if (!irq) { + dev_err(&pdev->dev, "IRQ missing or invalid\n"); + ret = -EINVAL; + goto clk_disable; + } + + ret = devm_request_irq(&pdev->dev, irq, spi_st_irq, 0, + pdev->name, spi_st); + if (ret) { + dev_err(&pdev->dev, "Failed to request irq %d\n", irq); + goto clk_disable; + } + + /* by default the device is on */ + pm_runtime_set_active(&pdev->dev); + pm_runtime_enable(&pdev->dev); + + platform_set_drvdata(pdev, master); + + ret = devm_spi_register_master(&pdev->dev, master); + if (ret) { + dev_err(&pdev->dev, "Failed to register master\n"); + goto rpm_disable; + } + + return 0; + +rpm_disable: + pm_runtime_disable(&pdev->dev); +clk_disable: + clk_disable_unprepare(spi_st->clk); +put_master: + spi_master_put(master); + return ret; +} + +static int spi_st_remove(struct platform_device *pdev) +{ + struct spi_master *master = platform_get_drvdata(pdev); + struct spi_st *spi_st = spi_master_get_devdata(master); + + pm_runtime_disable(&pdev->dev); + + clk_disable_unprepare(spi_st->clk); + + pinctrl_pm_select_sleep_state(&pdev->dev); + + return 0; +} + +#ifdef CONFIG_PM +static int spi_st_runtime_suspend(struct device *dev) +{ + struct spi_master *master = dev_get_drvdata(dev); + struct spi_st *spi_st = spi_master_get_devdata(master); + + writel_relaxed(0, spi_st->base + SSC_IEN); + pinctrl_pm_select_sleep_state(dev); + + clk_disable_unprepare(spi_st->clk); + + return 0; +} + +static int spi_st_runtime_resume(struct device *dev) +{ + struct spi_master *master = dev_get_drvdata(dev); + struct spi_st *spi_st = spi_master_get_devdata(master); + int ret; + + ret = clk_prepare_enable(spi_st->clk); + pinctrl_pm_select_default_state(dev); + + return ret; +} +#endif + +#ifdef CONFIG_PM_SLEEP +static int spi_st_suspend(struct device *dev) +{ + struct spi_master *master = dev_get_drvdata(dev); + int ret; + + ret = spi_master_suspend(master); + if (ret) + return ret; + + return pm_runtime_force_suspend(dev); +} + +static int spi_st_resume(struct device *dev) +{ + struct spi_master *master = dev_get_drvdata(dev); + int ret; + + ret = spi_master_resume(master); + if (ret) + return ret; + + return pm_runtime_force_resume(dev); +} +#endif + +static const struct dev_pm_ops spi_st_pm = { + SET_SYSTEM_SLEEP_PM_OPS(spi_st_suspend, spi_st_resume) + SET_RUNTIME_PM_OPS(spi_st_runtime_suspend, spi_st_runtime_resume, NULL) +}; + +static const struct of_device_id stm_spi_match[] = { + { .compatible = "st,comms-ssc4-spi", }, + {}, +}; +MODULE_DEVICE_TABLE(of, stm_spi_match); + +static struct platform_driver spi_st_driver = { + .driver = { + .name = "spi-st", + .pm = &spi_st_pm, + .of_match_table = of_match_ptr(stm_spi_match), + }, + .probe = spi_st_probe, + .remove = spi_st_remove, +}; +module_platform_driver(spi_st_driver); + +MODULE_AUTHOR("Patrice Chotard <patrice.chotard@st.com>"); +MODULE_DESCRIPTION("STM SSC SPI driver"); +MODULE_LICENSE("GPL v2"); diff --git a/drivers/spi/spi-stm32-qspi.c b/drivers/spi/spi-stm32-qspi.c new file mode 100644 index 000000000..9c58dcd7b --- /dev/null +++ b/drivers/spi/spi-stm32-qspi.c @@ -0,0 +1,788 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (C) STMicroelectronics 2018 - All Rights Reserved + * Author: Ludovic Barre <ludovic.barre@st.com> for STMicroelectronics. + */ +#include <linux/bitfield.h> +#include <linux/clk.h> +#include <linux/dmaengine.h> +#include <linux/dma-mapping.h> +#include <linux/errno.h> +#include <linux/io.h> +#include <linux/iopoll.h> +#include <linux/interrupt.h> +#include <linux/module.h> +#include <linux/mutex.h> +#include <linux/of.h> +#include <linux/of_device.h> +#include <linux/pinctrl/consumer.h> +#include <linux/pm_runtime.h> +#include <linux/platform_device.h> +#include <linux/reset.h> +#include <linux/sizes.h> +#include <linux/spi/spi-mem.h> + +#define QSPI_CR 0x00 +#define CR_EN BIT(0) +#define CR_ABORT BIT(1) +#define CR_DMAEN BIT(2) +#define CR_TCEN BIT(3) +#define CR_SSHIFT BIT(4) +#define CR_DFM BIT(6) +#define CR_FSEL BIT(7) +#define CR_FTHRES_SHIFT 8 +#define CR_TEIE BIT(16) +#define CR_TCIE BIT(17) +#define CR_FTIE BIT(18) +#define CR_SMIE BIT(19) +#define CR_TOIE BIT(20) +#define CR_PRESC_MASK GENMASK(31, 24) + +#define QSPI_DCR 0x04 +#define DCR_FSIZE_MASK GENMASK(20, 16) + +#define QSPI_SR 0x08 +#define SR_TEF BIT(0) +#define SR_TCF BIT(1) +#define SR_FTF BIT(2) +#define SR_SMF BIT(3) +#define SR_TOF BIT(4) +#define SR_BUSY BIT(5) +#define SR_FLEVEL_MASK GENMASK(13, 8) + +#define QSPI_FCR 0x0c +#define FCR_CTEF BIT(0) +#define FCR_CTCF BIT(1) + +#define QSPI_DLR 0x10 + +#define QSPI_CCR 0x14 +#define CCR_INST_MASK GENMASK(7, 0) +#define CCR_IMODE_MASK GENMASK(9, 8) +#define CCR_ADMODE_MASK GENMASK(11, 10) +#define CCR_ADSIZE_MASK GENMASK(13, 12) +#define CCR_DCYC_MASK GENMASK(22, 18) +#define CCR_DMODE_MASK GENMASK(25, 24) +#define CCR_FMODE_MASK GENMASK(27, 26) +#define CCR_FMODE_INDW (0U << 26) +#define CCR_FMODE_INDR (1U << 26) +#define CCR_FMODE_APM (2U << 26) +#define CCR_FMODE_MM (3U << 26) +#define CCR_BUSWIDTH_0 0x0 +#define CCR_BUSWIDTH_1 0x1 +#define CCR_BUSWIDTH_2 0x2 +#define CCR_BUSWIDTH_4 0x3 + +#define QSPI_AR 0x18 +#define QSPI_ABR 0x1c +#define QSPI_DR 0x20 +#define QSPI_PSMKR 0x24 +#define QSPI_PSMAR 0x28 +#define QSPI_PIR 0x2c +#define QSPI_LPTR 0x30 + +#define STM32_QSPI_MAX_MMAP_SZ SZ_256M +#define STM32_QSPI_MAX_NORCHIP 2 + +#define STM32_FIFO_TIMEOUT_US 30000 +#define STM32_BUSY_TIMEOUT_US 100000 +#define STM32_ABT_TIMEOUT_US 100000 +#define STM32_COMP_TIMEOUT_MS 1000 +#define STM32_AUTOSUSPEND_DELAY -1 + +struct stm32_qspi_flash { + struct stm32_qspi *qspi; + u32 cs; + u32 presc; +}; + +struct stm32_qspi { + struct device *dev; + struct spi_controller *ctrl; + phys_addr_t phys_base; + void __iomem *io_base; + void __iomem *mm_base; + resource_size_t mm_size; + struct clk *clk; + u32 clk_rate; + struct stm32_qspi_flash flash[STM32_QSPI_MAX_NORCHIP]; + struct completion data_completion; + u32 fmode; + + struct dma_chan *dma_chtx; + struct dma_chan *dma_chrx; + struct completion dma_completion; + + u32 cr_reg; + u32 dcr_reg; + + /* + * to protect device configuration, could be different between + * 2 flash access (bk1, bk2) + */ + struct mutex lock; +}; + +static irqreturn_t stm32_qspi_irq(int irq, void *dev_id) +{ + struct stm32_qspi *qspi = (struct stm32_qspi *)dev_id; + u32 cr, sr; + + sr = readl_relaxed(qspi->io_base + QSPI_SR); + + if (sr & (SR_TEF | SR_TCF)) { + /* disable irq */ + cr = readl_relaxed(qspi->io_base + QSPI_CR); + cr &= ~CR_TCIE & ~CR_TEIE; + writel_relaxed(cr, qspi->io_base + QSPI_CR); + complete(&qspi->data_completion); + } + + return IRQ_HANDLED; +} + +static void stm32_qspi_read_fifo(u8 *val, void __iomem *addr) +{ + *val = readb_relaxed(addr); +} + +static void stm32_qspi_write_fifo(u8 *val, void __iomem *addr) +{ + writeb_relaxed(*val, addr); +} + +static int stm32_qspi_tx_poll(struct stm32_qspi *qspi, + const struct spi_mem_op *op) +{ + void (*tx_fifo)(u8 *val, void __iomem *addr); + u32 len = op->data.nbytes, sr; + u8 *buf; + int ret; + + if (op->data.dir == SPI_MEM_DATA_IN) { + tx_fifo = stm32_qspi_read_fifo; + buf = op->data.buf.in; + + } else { + tx_fifo = stm32_qspi_write_fifo; + buf = (u8 *)op->data.buf.out; + } + + while (len--) { + ret = readl_relaxed_poll_timeout_atomic(qspi->io_base + QSPI_SR, + sr, (sr & SR_FTF), 1, + STM32_FIFO_TIMEOUT_US); + if (ret) { + dev_err(qspi->dev, "fifo timeout (len:%d stat:%#x)\n", + len, sr); + return ret; + } + tx_fifo(buf++, qspi->io_base + QSPI_DR); + } + + return 0; +} + +static int stm32_qspi_tx_mm(struct stm32_qspi *qspi, + const struct spi_mem_op *op) +{ + memcpy_fromio(op->data.buf.in, qspi->mm_base + op->addr.val, + op->data.nbytes); + return 0; +} + +static void stm32_qspi_dma_callback(void *arg) +{ + struct completion *dma_completion = arg; + + complete(dma_completion); +} + +static int stm32_qspi_tx_dma(struct stm32_qspi *qspi, + const struct spi_mem_op *op) +{ + struct dma_async_tx_descriptor *desc; + enum dma_transfer_direction dma_dir; + struct dma_chan *dma_ch; + struct sg_table sgt; + dma_cookie_t cookie; + u32 cr, t_out; + int err; + + if (op->data.dir == SPI_MEM_DATA_IN) { + dma_dir = DMA_DEV_TO_MEM; + dma_ch = qspi->dma_chrx; + } else { + dma_dir = DMA_MEM_TO_DEV; + dma_ch = qspi->dma_chtx; + } + + /* + * spi_map_buf return -EINVAL if the buffer is not DMA-able + * (DMA-able: in vmalloc | kmap | virt_addr_valid) + */ + err = spi_controller_dma_map_mem_op_data(qspi->ctrl, op, &sgt); + if (err) + return err; + + desc = dmaengine_prep_slave_sg(dma_ch, sgt.sgl, sgt.nents, + dma_dir, DMA_PREP_INTERRUPT); + if (!desc) { + err = -ENOMEM; + goto out_unmap; + } + + cr = readl_relaxed(qspi->io_base + QSPI_CR); + + reinit_completion(&qspi->dma_completion); + desc->callback = stm32_qspi_dma_callback; + desc->callback_param = &qspi->dma_completion; + cookie = dmaengine_submit(desc); + err = dma_submit_error(cookie); + if (err) + goto out; + + dma_async_issue_pending(dma_ch); + + writel_relaxed(cr | CR_DMAEN, qspi->io_base + QSPI_CR); + + t_out = sgt.nents * STM32_COMP_TIMEOUT_MS; + if (!wait_for_completion_timeout(&qspi->dma_completion, + msecs_to_jiffies(t_out))) + err = -ETIMEDOUT; + + if (err) + dmaengine_terminate_all(dma_ch); + +out: + writel_relaxed(cr & ~CR_DMAEN, qspi->io_base + QSPI_CR); +out_unmap: + spi_controller_dma_unmap_mem_op_data(qspi->ctrl, op, &sgt); + + return err; +} + +static int stm32_qspi_tx(struct stm32_qspi *qspi, const struct spi_mem_op *op) +{ + if (!op->data.nbytes) + return 0; + + if (qspi->fmode == CCR_FMODE_MM) + return stm32_qspi_tx_mm(qspi, op); + else if ((op->data.dir == SPI_MEM_DATA_IN && qspi->dma_chrx) || + (op->data.dir == SPI_MEM_DATA_OUT && qspi->dma_chtx)) + if (!stm32_qspi_tx_dma(qspi, op)) + return 0; + + return stm32_qspi_tx_poll(qspi, op); +} + +static int stm32_qspi_wait_nobusy(struct stm32_qspi *qspi) +{ + u32 sr; + + return readl_relaxed_poll_timeout_atomic(qspi->io_base + QSPI_SR, sr, + !(sr & SR_BUSY), 1, + STM32_BUSY_TIMEOUT_US); +} + +static int stm32_qspi_wait_cmd(struct stm32_qspi *qspi, + const struct spi_mem_op *op) +{ + u32 cr, sr; + int err = 0; + + if (!op->data.nbytes) + goto wait_nobusy; + + if ((readl_relaxed(qspi->io_base + QSPI_SR) & SR_TCF) || + qspi->fmode == CCR_FMODE_APM) + goto out; + + reinit_completion(&qspi->data_completion); + cr = readl_relaxed(qspi->io_base + QSPI_CR); + writel_relaxed(cr | CR_TCIE | CR_TEIE, qspi->io_base + QSPI_CR); + + if (!wait_for_completion_timeout(&qspi->data_completion, + msecs_to_jiffies(STM32_COMP_TIMEOUT_MS))) { + err = -ETIMEDOUT; + } else { + sr = readl_relaxed(qspi->io_base + QSPI_SR); + if (sr & SR_TEF) + err = -EIO; + } + +out: + /* clear flags */ + writel_relaxed(FCR_CTCF | FCR_CTEF, qspi->io_base + QSPI_FCR); +wait_nobusy: + if (!err) + err = stm32_qspi_wait_nobusy(qspi); + + return err; +} + +static int stm32_qspi_get_mode(struct stm32_qspi *qspi, u8 buswidth) +{ + if (buswidth == 4) + return CCR_BUSWIDTH_4; + + return buswidth; +} + +static int stm32_qspi_send(struct spi_mem *mem, const struct spi_mem_op *op) +{ + struct stm32_qspi *qspi = spi_controller_get_devdata(mem->spi->master); + struct stm32_qspi_flash *flash = &qspi->flash[mem->spi->chip_select]; + u32 ccr, cr, addr_max; + int timeout, err = 0; + + dev_dbg(qspi->dev, "cmd:%#x mode:%d.%d.%d.%d addr:%#llx len:%#x\n", + op->cmd.opcode, op->cmd.buswidth, op->addr.buswidth, + op->dummy.buswidth, op->data.buswidth, + op->addr.val, op->data.nbytes); + + err = stm32_qspi_wait_nobusy(qspi); + if (err) + goto abort; + + addr_max = op->addr.val + op->data.nbytes + 1; + + if (op->data.dir == SPI_MEM_DATA_IN) { + if (addr_max < qspi->mm_size && + op->addr.buswidth) + qspi->fmode = CCR_FMODE_MM; + else + qspi->fmode = CCR_FMODE_INDR; + } else { + qspi->fmode = CCR_FMODE_INDW; + } + + cr = readl_relaxed(qspi->io_base + QSPI_CR); + cr &= ~CR_PRESC_MASK & ~CR_FSEL; + cr |= FIELD_PREP(CR_PRESC_MASK, flash->presc); + cr |= FIELD_PREP(CR_FSEL, flash->cs); + writel_relaxed(cr, qspi->io_base + QSPI_CR); + + if (op->data.nbytes) + writel_relaxed(op->data.nbytes - 1, + qspi->io_base + QSPI_DLR); + else + qspi->fmode = CCR_FMODE_INDW; + + ccr = qspi->fmode; + ccr |= FIELD_PREP(CCR_INST_MASK, op->cmd.opcode); + ccr |= FIELD_PREP(CCR_IMODE_MASK, + stm32_qspi_get_mode(qspi, op->cmd.buswidth)); + + if (op->addr.nbytes) { + ccr |= FIELD_PREP(CCR_ADMODE_MASK, + stm32_qspi_get_mode(qspi, op->addr.buswidth)); + ccr |= FIELD_PREP(CCR_ADSIZE_MASK, op->addr.nbytes - 1); + } + + if (op->dummy.buswidth && op->dummy.nbytes) + ccr |= FIELD_PREP(CCR_DCYC_MASK, + op->dummy.nbytes * 8 / op->dummy.buswidth); + + if (op->data.nbytes) { + ccr |= FIELD_PREP(CCR_DMODE_MASK, + stm32_qspi_get_mode(qspi, op->data.buswidth)); + } + + writel_relaxed(ccr, qspi->io_base + QSPI_CCR); + + if (op->addr.nbytes && qspi->fmode != CCR_FMODE_MM) + writel_relaxed(op->addr.val, qspi->io_base + QSPI_AR); + + err = stm32_qspi_tx(qspi, op); + + /* + * Abort in: + * -error case + * -read memory map: prefetching must be stopped if we read the last + * byte of device (device size - fifo size). like device size is not + * knows, the prefetching is always stop. + */ + if (err || qspi->fmode == CCR_FMODE_MM) + goto abort; + + /* wait end of tx in indirect mode */ + err = stm32_qspi_wait_cmd(qspi, op); + if (err) + goto abort; + + return 0; + +abort: + cr = readl_relaxed(qspi->io_base + QSPI_CR) | CR_ABORT; + writel_relaxed(cr, qspi->io_base + QSPI_CR); + + /* wait clear of abort bit by hw */ + timeout = readl_relaxed_poll_timeout_atomic(qspi->io_base + QSPI_CR, + cr, !(cr & CR_ABORT), 1, + STM32_ABT_TIMEOUT_US); + + writel_relaxed(FCR_CTCF, qspi->io_base + QSPI_FCR); + + if (err || timeout) + dev_err(qspi->dev, "%s err:%d abort timeout:%d\n", + __func__, err, timeout); + + return err; +} + +static int stm32_qspi_exec_op(struct spi_mem *mem, const struct spi_mem_op *op) +{ + struct stm32_qspi *qspi = spi_controller_get_devdata(mem->spi->master); + int ret; + + ret = pm_runtime_get_sync(qspi->dev); + if (ret < 0) { + pm_runtime_put_noidle(qspi->dev); + return ret; + } + + mutex_lock(&qspi->lock); + ret = stm32_qspi_send(mem, op); + mutex_unlock(&qspi->lock); + + pm_runtime_mark_last_busy(qspi->dev); + pm_runtime_put_autosuspend(qspi->dev); + + return ret; +} + +static int stm32_qspi_setup(struct spi_device *spi) +{ + struct spi_controller *ctrl = spi->master; + struct stm32_qspi *qspi = spi_controller_get_devdata(ctrl); + struct stm32_qspi_flash *flash; + u32 presc; + int ret; + + if (ctrl->busy) + return -EBUSY; + + if (!spi->max_speed_hz) + return -EINVAL; + + ret = pm_runtime_get_sync(qspi->dev); + if (ret < 0) { + pm_runtime_put_noidle(qspi->dev); + return ret; + } + + presc = DIV_ROUND_UP(qspi->clk_rate, spi->max_speed_hz) - 1; + + flash = &qspi->flash[spi->chip_select]; + flash->qspi = qspi; + flash->cs = spi->chip_select; + flash->presc = presc; + + mutex_lock(&qspi->lock); + qspi->cr_reg = 3 << CR_FTHRES_SHIFT | CR_SSHIFT | CR_EN; + writel_relaxed(qspi->cr_reg, qspi->io_base + QSPI_CR); + + /* set dcr fsize to max address */ + qspi->dcr_reg = DCR_FSIZE_MASK; + writel_relaxed(qspi->dcr_reg, qspi->io_base + QSPI_DCR); + mutex_unlock(&qspi->lock); + + pm_runtime_mark_last_busy(qspi->dev); + pm_runtime_put_autosuspend(qspi->dev); + + return 0; +} + +static int stm32_qspi_dma_setup(struct stm32_qspi *qspi) +{ + struct dma_slave_config dma_cfg; + struct device *dev = qspi->dev; + int ret = 0; + + memset(&dma_cfg, 0, sizeof(dma_cfg)); + + dma_cfg.src_addr_width = DMA_SLAVE_BUSWIDTH_1_BYTE; + dma_cfg.dst_addr_width = DMA_SLAVE_BUSWIDTH_1_BYTE; + dma_cfg.src_addr = qspi->phys_base + QSPI_DR; + dma_cfg.dst_addr = qspi->phys_base + QSPI_DR; + dma_cfg.src_maxburst = 4; + dma_cfg.dst_maxburst = 4; + + qspi->dma_chrx = dma_request_chan(dev, "rx"); + if (IS_ERR(qspi->dma_chrx)) { + ret = PTR_ERR(qspi->dma_chrx); + qspi->dma_chrx = NULL; + if (ret == -EPROBE_DEFER) + goto out; + } else { + if (dmaengine_slave_config(qspi->dma_chrx, &dma_cfg)) { + dev_err(dev, "dma rx config failed\n"); + dma_release_channel(qspi->dma_chrx); + qspi->dma_chrx = NULL; + } + } + + qspi->dma_chtx = dma_request_chan(dev, "tx"); + if (IS_ERR(qspi->dma_chtx)) { + ret = PTR_ERR(qspi->dma_chtx); + qspi->dma_chtx = NULL; + } else { + if (dmaengine_slave_config(qspi->dma_chtx, &dma_cfg)) { + dev_err(dev, "dma tx config failed\n"); + dma_release_channel(qspi->dma_chtx); + qspi->dma_chtx = NULL; + } + } + +out: + init_completion(&qspi->dma_completion); + + if (ret != -EPROBE_DEFER) + ret = 0; + + return ret; +} + +static void stm32_qspi_dma_free(struct stm32_qspi *qspi) +{ + if (qspi->dma_chtx) + dma_release_channel(qspi->dma_chtx); + if (qspi->dma_chrx) + dma_release_channel(qspi->dma_chrx); +} + +/* + * no special host constraint, so use default spi_mem_default_supports_op + * to check supported mode. + */ +static const struct spi_controller_mem_ops stm32_qspi_mem_ops = { + .exec_op = stm32_qspi_exec_op, +}; + +static int stm32_qspi_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct spi_controller *ctrl; + struct reset_control *rstc; + struct stm32_qspi *qspi; + struct resource *res; + int ret, irq; + + ctrl = spi_alloc_master(dev, sizeof(*qspi)); + if (!ctrl) + return -ENOMEM; + + qspi = spi_controller_get_devdata(ctrl); + qspi->ctrl = ctrl; + + res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "qspi"); + qspi->io_base = devm_ioremap_resource(dev, res); + if (IS_ERR(qspi->io_base)) { + ret = PTR_ERR(qspi->io_base); + goto err_master_put; + } + + qspi->phys_base = res->start; + + res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "qspi_mm"); + qspi->mm_base = devm_ioremap_resource(dev, res); + if (IS_ERR(qspi->mm_base)) { + ret = PTR_ERR(qspi->mm_base); + goto err_master_put; + } + + qspi->mm_size = resource_size(res); + if (qspi->mm_size > STM32_QSPI_MAX_MMAP_SZ) { + ret = -EINVAL; + goto err_master_put; + } + + irq = platform_get_irq(pdev, 0); + if (irq < 0) { + ret = irq; + goto err_master_put; + } + + ret = devm_request_irq(dev, irq, stm32_qspi_irq, 0, + dev_name(dev), qspi); + if (ret) { + dev_err(dev, "failed to request irq\n"); + goto err_master_put; + } + + init_completion(&qspi->data_completion); + + qspi->clk = devm_clk_get(dev, NULL); + if (IS_ERR(qspi->clk)) { + ret = PTR_ERR(qspi->clk); + goto err_master_put; + } + + qspi->clk_rate = clk_get_rate(qspi->clk); + if (!qspi->clk_rate) { + ret = -EINVAL; + goto err_master_put; + } + + ret = clk_prepare_enable(qspi->clk); + if (ret) { + dev_err(dev, "can not enable the clock\n"); + goto err_master_put; + } + + rstc = devm_reset_control_get_exclusive(dev, NULL); + if (IS_ERR(rstc)) { + ret = PTR_ERR(rstc); + if (ret == -EPROBE_DEFER) + goto err_clk_disable; + } else { + reset_control_assert(rstc); + udelay(2); + reset_control_deassert(rstc); + } + + qspi->dev = dev; + platform_set_drvdata(pdev, qspi); + ret = stm32_qspi_dma_setup(qspi); + if (ret) + goto err_dma_free; + + mutex_init(&qspi->lock); + + ctrl->mode_bits = SPI_RX_DUAL | SPI_RX_QUAD + | SPI_TX_DUAL | SPI_TX_QUAD; + ctrl->setup = stm32_qspi_setup; + ctrl->bus_num = -1; + ctrl->mem_ops = &stm32_qspi_mem_ops; + ctrl->num_chipselect = STM32_QSPI_MAX_NORCHIP; + ctrl->dev.of_node = dev->of_node; + + pm_runtime_set_autosuspend_delay(dev, STM32_AUTOSUSPEND_DELAY); + pm_runtime_use_autosuspend(dev); + pm_runtime_set_active(dev); + pm_runtime_enable(dev); + pm_runtime_get_noresume(dev); + + ret = devm_spi_register_master(dev, ctrl); + if (ret) + goto err_pm_runtime_free; + + pm_runtime_mark_last_busy(dev); + pm_runtime_put_autosuspend(dev); + + return 0; + +err_pm_runtime_free: + pm_runtime_get_sync(qspi->dev); + /* disable qspi */ + writel_relaxed(0, qspi->io_base + QSPI_CR); + mutex_destroy(&qspi->lock); + pm_runtime_put_noidle(qspi->dev); + pm_runtime_disable(qspi->dev); + pm_runtime_set_suspended(qspi->dev); + pm_runtime_dont_use_autosuspend(qspi->dev); +err_dma_free: + stm32_qspi_dma_free(qspi); +err_clk_disable: + clk_disable_unprepare(qspi->clk); +err_master_put: + spi_master_put(qspi->ctrl); + + return ret; +} + +static int stm32_qspi_remove(struct platform_device *pdev) +{ + struct stm32_qspi *qspi = platform_get_drvdata(pdev); + + pm_runtime_get_sync(qspi->dev); + /* disable qspi */ + writel_relaxed(0, qspi->io_base + QSPI_CR); + stm32_qspi_dma_free(qspi); + mutex_destroy(&qspi->lock); + pm_runtime_put_noidle(qspi->dev); + pm_runtime_disable(qspi->dev); + pm_runtime_set_suspended(qspi->dev); + pm_runtime_dont_use_autosuspend(qspi->dev); + clk_disable_unprepare(qspi->clk); + + return 0; +} + +static int __maybe_unused stm32_qspi_runtime_suspend(struct device *dev) +{ + struct stm32_qspi *qspi = dev_get_drvdata(dev); + + clk_disable_unprepare(qspi->clk); + + return 0; +} + +static int __maybe_unused stm32_qspi_runtime_resume(struct device *dev) +{ + struct stm32_qspi *qspi = dev_get_drvdata(dev); + + return clk_prepare_enable(qspi->clk); +} + +static int __maybe_unused stm32_qspi_suspend(struct device *dev) +{ + pinctrl_pm_select_sleep_state(dev); + + return pm_runtime_force_suspend(dev); +} + +static int __maybe_unused stm32_qspi_resume(struct device *dev) +{ + struct stm32_qspi *qspi = dev_get_drvdata(dev); + int ret; + + ret = pm_runtime_force_resume(dev); + if (ret < 0) + return ret; + + pinctrl_pm_select_default_state(dev); + + ret = pm_runtime_get_sync(dev); + if (ret < 0) { + pm_runtime_put_noidle(dev); + return ret; + } + + writel_relaxed(qspi->cr_reg, qspi->io_base + QSPI_CR); + writel_relaxed(qspi->dcr_reg, qspi->io_base + QSPI_DCR); + + pm_runtime_mark_last_busy(dev); + pm_runtime_put_autosuspend(dev); + + return 0; +} + +static const struct dev_pm_ops stm32_qspi_pm_ops = { + SET_RUNTIME_PM_OPS(stm32_qspi_runtime_suspend, + stm32_qspi_runtime_resume, NULL) + SET_SYSTEM_SLEEP_PM_OPS(stm32_qspi_suspend, stm32_qspi_resume) +}; + +static const struct of_device_id stm32_qspi_match[] = { + {.compatible = "st,stm32f469-qspi"}, + {} +}; +MODULE_DEVICE_TABLE(of, stm32_qspi_match); + +static struct platform_driver stm32_qspi_driver = { + .probe = stm32_qspi_probe, + .remove = stm32_qspi_remove, + .driver = { + .name = "stm32-qspi", + .of_match_table = stm32_qspi_match, + .pm = &stm32_qspi_pm_ops, + }, +}; +module_platform_driver(stm32_qspi_driver); + +MODULE_AUTHOR("Ludovic Barre <ludovic.barre@st.com>"); +MODULE_DESCRIPTION("STMicroelectronics STM32 quad spi driver"); +MODULE_LICENSE("GPL v2"); diff --git a/drivers/spi/spi-stm32.c b/drivers/spi/spi-stm32.c new file mode 100644 index 000000000..9ec37cf10 --- /dev/null +++ b/drivers/spi/spi-stm32.c @@ -0,0 +1,2105 @@ +// SPDX-License-Identifier: GPL-2.0 +// +// STMicroelectronics STM32 SPI Controller driver (master mode only) +// +// Copyright (C) 2017, STMicroelectronics - All Rights Reserved +// Author(s): Amelie Delaunay <amelie.delaunay@st.com> for STMicroelectronics. + +#include <linux/debugfs.h> +#include <linux/clk.h> +#include <linux/delay.h> +#include <linux/dmaengine.h> +#include <linux/interrupt.h> +#include <linux/iopoll.h> +#include <linux/module.h> +#include <linux/of_platform.h> +#include <linux/pinctrl/consumer.h> +#include <linux/pm_runtime.h> +#include <linux/reset.h> +#include <linux/spi/spi.h> + +#define DRIVER_NAME "spi_stm32" + +/* STM32F4 SPI registers */ +#define STM32F4_SPI_CR1 0x00 +#define STM32F4_SPI_CR2 0x04 +#define STM32F4_SPI_SR 0x08 +#define STM32F4_SPI_DR 0x0C +#define STM32F4_SPI_I2SCFGR 0x1C + +/* STM32F4_SPI_CR1 bit fields */ +#define STM32F4_SPI_CR1_CPHA BIT(0) +#define STM32F4_SPI_CR1_CPOL BIT(1) +#define STM32F4_SPI_CR1_MSTR BIT(2) +#define STM32F4_SPI_CR1_BR_SHIFT 3 +#define STM32F4_SPI_CR1_BR GENMASK(5, 3) +#define STM32F4_SPI_CR1_SPE BIT(6) +#define STM32F4_SPI_CR1_LSBFRST BIT(7) +#define STM32F4_SPI_CR1_SSI BIT(8) +#define STM32F4_SPI_CR1_SSM BIT(9) +#define STM32F4_SPI_CR1_RXONLY BIT(10) +#define STM32F4_SPI_CR1_DFF BIT(11) +#define STM32F4_SPI_CR1_CRCNEXT BIT(12) +#define STM32F4_SPI_CR1_CRCEN BIT(13) +#define STM32F4_SPI_CR1_BIDIOE BIT(14) +#define STM32F4_SPI_CR1_BIDIMODE BIT(15) +#define STM32F4_SPI_CR1_BR_MIN 0 +#define STM32F4_SPI_CR1_BR_MAX (GENMASK(5, 3) >> 3) + +/* STM32F4_SPI_CR2 bit fields */ +#define STM32F4_SPI_CR2_RXDMAEN BIT(0) +#define STM32F4_SPI_CR2_TXDMAEN BIT(1) +#define STM32F4_SPI_CR2_SSOE BIT(2) +#define STM32F4_SPI_CR2_FRF BIT(4) +#define STM32F4_SPI_CR2_ERRIE BIT(5) +#define STM32F4_SPI_CR2_RXNEIE BIT(6) +#define STM32F4_SPI_CR2_TXEIE BIT(7) + +/* STM32F4_SPI_SR bit fields */ +#define STM32F4_SPI_SR_RXNE BIT(0) +#define STM32F4_SPI_SR_TXE BIT(1) +#define STM32F4_SPI_SR_CHSIDE BIT(2) +#define STM32F4_SPI_SR_UDR BIT(3) +#define STM32F4_SPI_SR_CRCERR BIT(4) +#define STM32F4_SPI_SR_MODF BIT(5) +#define STM32F4_SPI_SR_OVR BIT(6) +#define STM32F4_SPI_SR_BSY BIT(7) +#define STM32F4_SPI_SR_FRE BIT(8) + +/* STM32F4_SPI_I2SCFGR bit fields */ +#define STM32F4_SPI_I2SCFGR_I2SMOD BIT(11) + +/* STM32F4 SPI Baud Rate min/max divisor */ +#define STM32F4_SPI_BR_DIV_MIN (2 << STM32F4_SPI_CR1_BR_MIN) +#define STM32F4_SPI_BR_DIV_MAX (2 << STM32F4_SPI_CR1_BR_MAX) + +/* STM32H7 SPI registers */ +#define STM32H7_SPI_CR1 0x00 +#define STM32H7_SPI_CR2 0x04 +#define STM32H7_SPI_CFG1 0x08 +#define STM32H7_SPI_CFG2 0x0C +#define STM32H7_SPI_IER 0x10 +#define STM32H7_SPI_SR 0x14 +#define STM32H7_SPI_IFCR 0x18 +#define STM32H7_SPI_TXDR 0x20 +#define STM32H7_SPI_RXDR 0x30 +#define STM32H7_SPI_I2SCFGR 0x50 + +/* STM32H7_SPI_CR1 bit fields */ +#define STM32H7_SPI_CR1_SPE BIT(0) +#define STM32H7_SPI_CR1_MASRX BIT(8) +#define STM32H7_SPI_CR1_CSTART BIT(9) +#define STM32H7_SPI_CR1_CSUSP BIT(10) +#define STM32H7_SPI_CR1_HDDIR BIT(11) +#define STM32H7_SPI_CR1_SSI BIT(12) + +/* STM32H7_SPI_CR2 bit fields */ +#define STM32H7_SPI_CR2_TSIZE_SHIFT 0 +#define STM32H7_SPI_CR2_TSIZE GENMASK(15, 0) + +/* STM32H7_SPI_CFG1 bit fields */ +#define STM32H7_SPI_CFG1_DSIZE_SHIFT 0 +#define STM32H7_SPI_CFG1_DSIZE GENMASK(4, 0) +#define STM32H7_SPI_CFG1_FTHLV_SHIFT 5 +#define STM32H7_SPI_CFG1_FTHLV GENMASK(8, 5) +#define STM32H7_SPI_CFG1_RXDMAEN BIT(14) +#define STM32H7_SPI_CFG1_TXDMAEN BIT(15) +#define STM32H7_SPI_CFG1_MBR_SHIFT 28 +#define STM32H7_SPI_CFG1_MBR GENMASK(30, 28) +#define STM32H7_SPI_CFG1_MBR_MIN 0 +#define STM32H7_SPI_CFG1_MBR_MAX (GENMASK(30, 28) >> 28) + +/* STM32H7_SPI_CFG2 bit fields */ +#define STM32H7_SPI_CFG2_MIDI_SHIFT 4 +#define STM32H7_SPI_CFG2_MIDI GENMASK(7, 4) +#define STM32H7_SPI_CFG2_COMM_SHIFT 17 +#define STM32H7_SPI_CFG2_COMM GENMASK(18, 17) +#define STM32H7_SPI_CFG2_SP_SHIFT 19 +#define STM32H7_SPI_CFG2_SP GENMASK(21, 19) +#define STM32H7_SPI_CFG2_MASTER BIT(22) +#define STM32H7_SPI_CFG2_LSBFRST BIT(23) +#define STM32H7_SPI_CFG2_CPHA BIT(24) +#define STM32H7_SPI_CFG2_CPOL BIT(25) +#define STM32H7_SPI_CFG2_SSM BIT(26) +#define STM32H7_SPI_CFG2_AFCNTR BIT(31) + +/* STM32H7_SPI_IER bit fields */ +#define STM32H7_SPI_IER_RXPIE BIT(0) +#define STM32H7_SPI_IER_TXPIE BIT(1) +#define STM32H7_SPI_IER_DXPIE BIT(2) +#define STM32H7_SPI_IER_EOTIE BIT(3) +#define STM32H7_SPI_IER_TXTFIE BIT(4) +#define STM32H7_SPI_IER_OVRIE BIT(6) +#define STM32H7_SPI_IER_MODFIE BIT(9) +#define STM32H7_SPI_IER_ALL GENMASK(10, 0) + +/* STM32H7_SPI_SR bit fields */ +#define STM32H7_SPI_SR_RXP BIT(0) +#define STM32H7_SPI_SR_TXP BIT(1) +#define STM32H7_SPI_SR_EOT BIT(3) +#define STM32H7_SPI_SR_OVR BIT(6) +#define STM32H7_SPI_SR_MODF BIT(9) +#define STM32H7_SPI_SR_SUSP BIT(11) +#define STM32H7_SPI_SR_RXPLVL_SHIFT 13 +#define STM32H7_SPI_SR_RXPLVL GENMASK(14, 13) +#define STM32H7_SPI_SR_RXWNE BIT(15) + +/* STM32H7_SPI_IFCR bit fields */ +#define STM32H7_SPI_IFCR_ALL GENMASK(11, 3) + +/* STM32H7_SPI_I2SCFGR bit fields */ +#define STM32H7_SPI_I2SCFGR_I2SMOD BIT(0) + +/* STM32H7 SPI Master Baud Rate min/max divisor */ +#define STM32H7_SPI_MBR_DIV_MIN (2 << STM32H7_SPI_CFG1_MBR_MIN) +#define STM32H7_SPI_MBR_DIV_MAX (2 << STM32H7_SPI_CFG1_MBR_MAX) + +/* STM32H7 SPI Communication mode */ +#define STM32H7_SPI_FULL_DUPLEX 0 +#define STM32H7_SPI_SIMPLEX_TX 1 +#define STM32H7_SPI_SIMPLEX_RX 2 +#define STM32H7_SPI_HALF_DUPLEX 3 + +/* SPI Communication type */ +#define SPI_FULL_DUPLEX 0 +#define SPI_SIMPLEX_TX 1 +#define SPI_SIMPLEX_RX 2 +#define SPI_3WIRE_TX 3 +#define SPI_3WIRE_RX 4 + +#define SPI_1HZ_NS 1000000000 + +/* + * use PIO for small transfers, avoiding DMA setup/teardown overhead for drivers + * without fifo buffers. + */ +#define SPI_DMA_MIN_BYTES 16 + +/** + * struct stm32_spi_reg - stm32 SPI register & bitfield desc + * @reg: register offset + * @mask: bitfield mask + * @shift: left shift + */ +struct stm32_spi_reg { + int reg; + int mask; + int shift; +}; + +/** + * struct stm32_spi_regspec - stm32 registers definition, compatible dependent data + * @en: enable register and SPI enable bit + * @dma_rx_en: SPI DMA RX enable register end SPI DMA RX enable bit + * @dma_tx_en: SPI DMA TX enable register end SPI DMA TX enable bit + * @cpol: clock polarity register and polarity bit + * @cpha: clock phase register and phase bit + * @lsb_first: LSB transmitted first register and bit + * @br: baud rate register and bitfields + * @rx: SPI RX data register + * @tx: SPI TX data register + */ +struct stm32_spi_regspec { + const struct stm32_spi_reg en; + const struct stm32_spi_reg dma_rx_en; + const struct stm32_spi_reg dma_tx_en; + const struct stm32_spi_reg cpol; + const struct stm32_spi_reg cpha; + const struct stm32_spi_reg lsb_first; + const struct stm32_spi_reg br; + const struct stm32_spi_reg rx; + const struct stm32_spi_reg tx; +}; + +struct stm32_spi; + +/** + * struct stm32_spi_cfg - stm32 compatible configuration data + * @regs: registers descriptions + * @get_fifo_size: routine to get fifo size + * @get_bpw_mask: routine to get bits per word mask + * @disable: routine to disable controller + * @config: routine to configure controller as SPI Master + * @set_bpw: routine to configure registers to for bits per word + * @set_mode: routine to configure registers to desired mode + * @set_data_idleness: optional routine to configure registers to desired idle + * time between frames (if driver has this functionality) + * @set_number_of_data: optional routine to configure registers to desired + * number of data (if driver has this functionality) + * @can_dma: routine to determine if the transfer is eligible for DMA use + * @transfer_one_dma_start: routine to start transfer a single spi_transfer + * using DMA + * @dma_rx_cb: routine to call after DMA RX channel operation is complete + * @dma_tx_cb: routine to call after DMA TX channel operation is complete + * @transfer_one_irq: routine to configure interrupts for driver + * @irq_handler_event: Interrupt handler for SPI controller events + * @irq_handler_thread: thread of interrupt handler for SPI controller + * @baud_rate_div_min: minimum baud rate divisor + * @baud_rate_div_max: maximum baud rate divisor + * @has_fifo: boolean to know if fifo is used for driver + * @has_startbit: boolean to know if start bit is used to start transfer + */ +struct stm32_spi_cfg { + const struct stm32_spi_regspec *regs; + int (*get_fifo_size)(struct stm32_spi *spi); + int (*get_bpw_mask)(struct stm32_spi *spi); + void (*disable)(struct stm32_spi *spi); + int (*config)(struct stm32_spi *spi); + void (*set_bpw)(struct stm32_spi *spi); + int (*set_mode)(struct stm32_spi *spi, unsigned int comm_type); + void (*set_data_idleness)(struct stm32_spi *spi, u32 length); + int (*set_number_of_data)(struct stm32_spi *spi, u32 length); + void (*transfer_one_dma_start)(struct stm32_spi *spi); + void (*dma_rx_cb)(void *data); + void (*dma_tx_cb)(void *data); + int (*transfer_one_irq)(struct stm32_spi *spi); + irqreturn_t (*irq_handler_event)(int irq, void *dev_id); + irqreturn_t (*irq_handler_thread)(int irq, void *dev_id); + unsigned int baud_rate_div_min; + unsigned int baud_rate_div_max; + bool has_fifo; +}; + +/** + * struct stm32_spi - private data of the SPI controller + * @dev: driver model representation of the controller + * @master: controller master interface + * @cfg: compatible configuration data + * @base: virtual memory area + * @clk: hw kernel clock feeding the SPI clock generator + * @clk_rate: rate of the hw kernel clock feeding the SPI clock generator + * @rst: SPI controller reset line + * @lock: prevent I/O concurrent access + * @irq: SPI controller interrupt line + * @fifo_size: size of the embedded fifo in bytes + * @cur_midi: master inter-data idleness in ns + * @cur_speed: speed configured in Hz + * @cur_bpw: number of bits in a single SPI data frame + * @cur_fthlv: fifo threshold level (data frames in a single data packet) + * @cur_comm: SPI communication mode + * @cur_xferlen: current transfer length in bytes + * @cur_usedma: boolean to know if dma is used in current transfer + * @tx_buf: data to be written, or NULL + * @rx_buf: data to be read, or NULL + * @tx_len: number of data to be written in bytes + * @rx_len: number of data to be read in bytes + * @dma_tx: dma channel for TX transfer + * @dma_rx: dma channel for RX transfer + * @phys_addr: SPI registers physical base address + */ +struct stm32_spi { + struct device *dev; + struct spi_master *master; + const struct stm32_spi_cfg *cfg; + void __iomem *base; + struct clk *clk; + u32 clk_rate; + struct reset_control *rst; + spinlock_t lock; /* prevent I/O concurrent access */ + int irq; + unsigned int fifo_size; + + unsigned int cur_midi; + unsigned int cur_speed; + unsigned int cur_bpw; + unsigned int cur_fthlv; + unsigned int cur_comm; + unsigned int cur_xferlen; + bool cur_usedma; + + const void *tx_buf; + void *rx_buf; + int tx_len; + int rx_len; + struct dma_chan *dma_tx; + struct dma_chan *dma_rx; + dma_addr_t phys_addr; +}; + +static const struct stm32_spi_regspec stm32f4_spi_regspec = { + .en = { STM32F4_SPI_CR1, STM32F4_SPI_CR1_SPE }, + + .dma_rx_en = { STM32F4_SPI_CR2, STM32F4_SPI_CR2_RXDMAEN }, + .dma_tx_en = { STM32F4_SPI_CR2, STM32F4_SPI_CR2_TXDMAEN }, + + .cpol = { STM32F4_SPI_CR1, STM32F4_SPI_CR1_CPOL }, + .cpha = { STM32F4_SPI_CR1, STM32F4_SPI_CR1_CPHA }, + .lsb_first = { STM32F4_SPI_CR1, STM32F4_SPI_CR1_LSBFRST }, + .br = { STM32F4_SPI_CR1, STM32F4_SPI_CR1_BR, STM32F4_SPI_CR1_BR_SHIFT }, + + .rx = { STM32F4_SPI_DR }, + .tx = { STM32F4_SPI_DR }, +}; + +static const struct stm32_spi_regspec stm32h7_spi_regspec = { + /* SPI data transfer is enabled but spi_ker_ck is idle. + * CFG1 and CFG2 registers are write protected when SPE is enabled. + */ + .en = { STM32H7_SPI_CR1, STM32H7_SPI_CR1_SPE }, + + .dma_rx_en = { STM32H7_SPI_CFG1, STM32H7_SPI_CFG1_RXDMAEN }, + .dma_tx_en = { STM32H7_SPI_CFG1, STM32H7_SPI_CFG1_TXDMAEN }, + + .cpol = { STM32H7_SPI_CFG2, STM32H7_SPI_CFG2_CPOL }, + .cpha = { STM32H7_SPI_CFG2, STM32H7_SPI_CFG2_CPHA }, + .lsb_first = { STM32H7_SPI_CFG2, STM32H7_SPI_CFG2_LSBFRST }, + .br = { STM32H7_SPI_CFG1, STM32H7_SPI_CFG1_MBR, + STM32H7_SPI_CFG1_MBR_SHIFT }, + + .rx = { STM32H7_SPI_RXDR }, + .tx = { STM32H7_SPI_TXDR }, +}; + +static inline void stm32_spi_set_bits(struct stm32_spi *spi, + u32 offset, u32 bits) +{ + writel_relaxed(readl_relaxed(spi->base + offset) | bits, + spi->base + offset); +} + +static inline void stm32_spi_clr_bits(struct stm32_spi *spi, + u32 offset, u32 bits) +{ + writel_relaxed(readl_relaxed(spi->base + offset) & ~bits, + spi->base + offset); +} + +/** + * stm32h7_spi_get_fifo_size - Return fifo size + * @spi: pointer to the spi controller data structure + */ +static int stm32h7_spi_get_fifo_size(struct stm32_spi *spi) +{ + unsigned long flags; + u32 count = 0; + + spin_lock_irqsave(&spi->lock, flags); + + stm32_spi_set_bits(spi, STM32H7_SPI_CR1, STM32H7_SPI_CR1_SPE); + + while (readl_relaxed(spi->base + STM32H7_SPI_SR) & STM32H7_SPI_SR_TXP) + writeb_relaxed(++count, spi->base + STM32H7_SPI_TXDR); + + stm32_spi_clr_bits(spi, STM32H7_SPI_CR1, STM32H7_SPI_CR1_SPE); + + spin_unlock_irqrestore(&spi->lock, flags); + + dev_dbg(spi->dev, "%d x 8-bit fifo size\n", count); + + return count; +} + +/** + * stm32f4_spi_get_bpw_mask - Return bits per word mask + * @spi: pointer to the spi controller data structure + */ +static int stm32f4_spi_get_bpw_mask(struct stm32_spi *spi) +{ + dev_dbg(spi->dev, "8-bit or 16-bit data frame supported\n"); + return SPI_BPW_MASK(8) | SPI_BPW_MASK(16); +} + +/** + * stm32h7_spi_get_bpw_mask - Return bits per word mask + * @spi: pointer to the spi controller data structure + */ +static int stm32h7_spi_get_bpw_mask(struct stm32_spi *spi) +{ + unsigned long flags; + u32 cfg1, max_bpw; + + spin_lock_irqsave(&spi->lock, flags); + + /* + * The most significant bit at DSIZE bit field is reserved when the + * maximum data size of periperal instances is limited to 16-bit + */ + stm32_spi_set_bits(spi, STM32H7_SPI_CFG1, STM32H7_SPI_CFG1_DSIZE); + + cfg1 = readl_relaxed(spi->base + STM32H7_SPI_CFG1); + max_bpw = (cfg1 & STM32H7_SPI_CFG1_DSIZE) >> + STM32H7_SPI_CFG1_DSIZE_SHIFT; + max_bpw += 1; + + spin_unlock_irqrestore(&spi->lock, flags); + + dev_dbg(spi->dev, "%d-bit maximum data frame\n", max_bpw); + + return SPI_BPW_RANGE_MASK(4, max_bpw); +} + +/** + * stm32_spi_prepare_mbr - Determine baud rate divisor value + * @spi: pointer to the spi controller data structure + * @speed_hz: requested speed + * @min_div: minimum baud rate divisor + * @max_div: maximum baud rate divisor + * + * Return baud rate divisor value in case of success or -EINVAL + */ +static int stm32_spi_prepare_mbr(struct stm32_spi *spi, u32 speed_hz, + u32 min_div, u32 max_div) +{ + u32 div, mbrdiv; + + /* Ensure spi->clk_rate is even */ + div = DIV_ROUND_CLOSEST(spi->clk_rate & ~0x1, speed_hz); + + /* + * SPI framework set xfer->speed_hz to master->max_speed_hz if + * xfer->speed_hz is greater than master->max_speed_hz, and it returns + * an error when xfer->speed_hz is lower than master->min_speed_hz, so + * no need to check it there. + * However, we need to ensure the following calculations. + */ + if ((div < min_div) || (div > max_div)) + return -EINVAL; + + /* Determine the first power of 2 greater than or equal to div */ + if (div & (div - 1)) + mbrdiv = fls(div); + else + mbrdiv = fls(div) - 1; + + spi->cur_speed = spi->clk_rate / (1 << mbrdiv); + + return mbrdiv - 1; +} + +/** + * stm32h7_spi_prepare_fthlv - Determine FIFO threshold level + * @spi: pointer to the spi controller data structure + * @xfer_len: length of the message to be transferred + */ +static u32 stm32h7_spi_prepare_fthlv(struct stm32_spi *spi, u32 xfer_len) +{ + u32 fthlv, half_fifo, packet; + + /* data packet should not exceed 1/2 of fifo space */ + half_fifo = (spi->fifo_size / 2); + + /* data_packet should not exceed transfer length */ + if (half_fifo > xfer_len) + packet = xfer_len; + else + packet = half_fifo; + + if (spi->cur_bpw <= 8) + fthlv = packet; + else if (spi->cur_bpw <= 16) + fthlv = packet / 2; + else + fthlv = packet / 4; + + /* align packet size with data registers access */ + if (spi->cur_bpw > 8) + fthlv += (fthlv % 2) ? 1 : 0; + else + fthlv += (fthlv % 4) ? (4 - (fthlv % 4)) : 0; + + if (!fthlv) + fthlv = 1; + + return fthlv; +} + +/** + * stm32f4_spi_write_tx - Write bytes to Transmit Data Register + * @spi: pointer to the spi controller data structure + * + * Read from tx_buf depends on remaining bytes to avoid to read beyond + * tx_buf end. + */ +static void stm32f4_spi_write_tx(struct stm32_spi *spi) +{ + if ((spi->tx_len > 0) && (readl_relaxed(spi->base + STM32F4_SPI_SR) & + STM32F4_SPI_SR_TXE)) { + u32 offs = spi->cur_xferlen - spi->tx_len; + + if (spi->cur_bpw == 16) { + const u16 *tx_buf16 = (const u16 *)(spi->tx_buf + offs); + + writew_relaxed(*tx_buf16, spi->base + STM32F4_SPI_DR); + spi->tx_len -= sizeof(u16); + } else { + const u8 *tx_buf8 = (const u8 *)(spi->tx_buf + offs); + + writeb_relaxed(*tx_buf8, spi->base + STM32F4_SPI_DR); + spi->tx_len -= sizeof(u8); + } + } + + dev_dbg(spi->dev, "%s: %d bytes left\n", __func__, spi->tx_len); +} + +/** + * stm32h7_spi_write_txfifo - Write bytes in Transmit Data Register + * @spi: pointer to the spi controller data structure + * + * Read from tx_buf depends on remaining bytes to avoid to read beyond + * tx_buf end. + */ +static void stm32h7_spi_write_txfifo(struct stm32_spi *spi) +{ + while ((spi->tx_len > 0) && + (readl_relaxed(spi->base + STM32H7_SPI_SR) & + STM32H7_SPI_SR_TXP)) { + u32 offs = spi->cur_xferlen - spi->tx_len; + + if (spi->tx_len >= sizeof(u32)) { + const u32 *tx_buf32 = (const u32 *)(spi->tx_buf + offs); + + writel_relaxed(*tx_buf32, spi->base + STM32H7_SPI_TXDR); + spi->tx_len -= sizeof(u32); + } else if (spi->tx_len >= sizeof(u16)) { + const u16 *tx_buf16 = (const u16 *)(spi->tx_buf + offs); + + writew_relaxed(*tx_buf16, spi->base + STM32H7_SPI_TXDR); + spi->tx_len -= sizeof(u16); + } else { + const u8 *tx_buf8 = (const u8 *)(spi->tx_buf + offs); + + writeb_relaxed(*tx_buf8, spi->base + STM32H7_SPI_TXDR); + spi->tx_len -= sizeof(u8); + } + } + + dev_dbg(spi->dev, "%s: %d bytes left\n", __func__, spi->tx_len); +} + +/** + * stm32f4_spi_read_rx - Read bytes from Receive Data Register + * @spi: pointer to the spi controller data structure + * + * Write in rx_buf depends on remaining bytes to avoid to write beyond + * rx_buf end. + */ +static void stm32f4_spi_read_rx(struct stm32_spi *spi) +{ + if ((spi->rx_len > 0) && (readl_relaxed(spi->base + STM32F4_SPI_SR) & + STM32F4_SPI_SR_RXNE)) { + u32 offs = spi->cur_xferlen - spi->rx_len; + + if (spi->cur_bpw == 16) { + u16 *rx_buf16 = (u16 *)(spi->rx_buf + offs); + + *rx_buf16 = readw_relaxed(spi->base + STM32F4_SPI_DR); + spi->rx_len -= sizeof(u16); + } else { + u8 *rx_buf8 = (u8 *)(spi->rx_buf + offs); + + *rx_buf8 = readb_relaxed(spi->base + STM32F4_SPI_DR); + spi->rx_len -= sizeof(u8); + } + } + + dev_dbg(spi->dev, "%s: %d bytes left\n", __func__, spi->rx_len); +} + +/** + * stm32h7_spi_read_rxfifo - Read bytes in Receive Data Register + * @spi: pointer to the spi controller data structure + * @flush: boolean indicating that FIFO should be flushed + * + * Write in rx_buf depends on remaining bytes to avoid to write beyond + * rx_buf end. + */ +static void stm32h7_spi_read_rxfifo(struct stm32_spi *spi, bool flush) +{ + u32 sr = readl_relaxed(spi->base + STM32H7_SPI_SR); + u32 rxplvl = (sr & STM32H7_SPI_SR_RXPLVL) >> + STM32H7_SPI_SR_RXPLVL_SHIFT; + + while ((spi->rx_len > 0) && + ((sr & STM32H7_SPI_SR_RXP) || + (flush && ((sr & STM32H7_SPI_SR_RXWNE) || (rxplvl > 0))))) { + u32 offs = spi->cur_xferlen - spi->rx_len; + + if ((spi->rx_len >= sizeof(u32)) || + (flush && (sr & STM32H7_SPI_SR_RXWNE))) { + u32 *rx_buf32 = (u32 *)(spi->rx_buf + offs); + + *rx_buf32 = readl_relaxed(spi->base + STM32H7_SPI_RXDR); + spi->rx_len -= sizeof(u32); + } else if ((spi->rx_len >= sizeof(u16)) || + (flush && (rxplvl >= 2 || spi->cur_bpw > 8))) { + u16 *rx_buf16 = (u16 *)(spi->rx_buf + offs); + + *rx_buf16 = readw_relaxed(spi->base + STM32H7_SPI_RXDR); + spi->rx_len -= sizeof(u16); + } else { + u8 *rx_buf8 = (u8 *)(spi->rx_buf + offs); + + *rx_buf8 = readb_relaxed(spi->base + STM32H7_SPI_RXDR); + spi->rx_len -= sizeof(u8); + } + + sr = readl_relaxed(spi->base + STM32H7_SPI_SR); + rxplvl = (sr & STM32H7_SPI_SR_RXPLVL) >> + STM32H7_SPI_SR_RXPLVL_SHIFT; + } + + dev_dbg(spi->dev, "%s%s: %d bytes left\n", __func__, + flush ? "(flush)" : "", spi->rx_len); +} + +/** + * stm32_spi_enable - Enable SPI controller + * @spi: pointer to the spi controller data structure + */ +static void stm32_spi_enable(struct stm32_spi *spi) +{ + dev_dbg(spi->dev, "enable controller\n"); + + stm32_spi_set_bits(spi, spi->cfg->regs->en.reg, + spi->cfg->regs->en.mask); +} + +/** + * stm32f4_spi_disable - Disable SPI controller + * @spi: pointer to the spi controller data structure + */ +static void stm32f4_spi_disable(struct stm32_spi *spi) +{ + unsigned long flags; + u32 sr; + + dev_dbg(spi->dev, "disable controller\n"); + + spin_lock_irqsave(&spi->lock, flags); + + if (!(readl_relaxed(spi->base + STM32F4_SPI_CR1) & + STM32F4_SPI_CR1_SPE)) { + spin_unlock_irqrestore(&spi->lock, flags); + return; + } + + /* Disable interrupts */ + stm32_spi_clr_bits(spi, STM32F4_SPI_CR2, STM32F4_SPI_CR2_TXEIE | + STM32F4_SPI_CR2_RXNEIE | + STM32F4_SPI_CR2_ERRIE); + + /* Wait until BSY = 0 */ + if (readl_relaxed_poll_timeout_atomic(spi->base + STM32F4_SPI_SR, + sr, !(sr & STM32F4_SPI_SR_BSY), + 10, 100000) < 0) { + dev_warn(spi->dev, "disabling condition timeout\n"); + } + + if (spi->cur_usedma && spi->dma_tx) + dmaengine_terminate_all(spi->dma_tx); + if (spi->cur_usedma && spi->dma_rx) + dmaengine_terminate_all(spi->dma_rx); + + stm32_spi_clr_bits(spi, STM32F4_SPI_CR1, STM32F4_SPI_CR1_SPE); + + stm32_spi_clr_bits(spi, STM32F4_SPI_CR2, STM32F4_SPI_CR2_TXDMAEN | + STM32F4_SPI_CR2_RXDMAEN); + + /* Sequence to clear OVR flag */ + readl_relaxed(spi->base + STM32F4_SPI_DR); + readl_relaxed(spi->base + STM32F4_SPI_SR); + + spin_unlock_irqrestore(&spi->lock, flags); +} + +/** + * stm32h7_spi_disable - Disable SPI controller + * @spi: pointer to the spi controller data structure + * + * RX-Fifo is flushed when SPI controller is disabled. To prevent any data + * loss, use stm32h7_spi_read_rxfifo(flush) to read the remaining bytes in + * RX-Fifo. + * Normally, if TSIZE has been configured, we should relax the hardware at the + * reception of the EOT interrupt. But in case of error, EOT will not be + * raised. So the subsystem unprepare_message call allows us to properly + * complete the transfer from an hardware point of view. + */ +static void stm32h7_spi_disable(struct stm32_spi *spi) +{ + unsigned long flags; + u32 cr1, sr; + + dev_dbg(spi->dev, "disable controller\n"); + + spin_lock_irqsave(&spi->lock, flags); + + cr1 = readl_relaxed(spi->base + STM32H7_SPI_CR1); + + if (!(cr1 & STM32H7_SPI_CR1_SPE)) { + spin_unlock_irqrestore(&spi->lock, flags); + return; + } + + /* Wait on EOT or suspend the flow */ + if (readl_relaxed_poll_timeout_atomic(spi->base + STM32H7_SPI_SR, + sr, !(sr & STM32H7_SPI_SR_EOT), + 10, 100000) < 0) { + if (cr1 & STM32H7_SPI_CR1_CSTART) { + writel_relaxed(cr1 | STM32H7_SPI_CR1_CSUSP, + spi->base + STM32H7_SPI_CR1); + if (readl_relaxed_poll_timeout_atomic( + spi->base + STM32H7_SPI_SR, + sr, !(sr & STM32H7_SPI_SR_SUSP), + 10, 100000) < 0) + dev_warn(spi->dev, + "Suspend request timeout\n"); + } + } + + if (!spi->cur_usedma && spi->rx_buf && (spi->rx_len > 0)) + stm32h7_spi_read_rxfifo(spi, true); + + if (spi->cur_usedma && spi->dma_tx) + dmaengine_terminate_all(spi->dma_tx); + if (spi->cur_usedma && spi->dma_rx) + dmaengine_terminate_all(spi->dma_rx); + + stm32_spi_clr_bits(spi, STM32H7_SPI_CR1, STM32H7_SPI_CR1_SPE); + + stm32_spi_clr_bits(spi, STM32H7_SPI_CFG1, STM32H7_SPI_CFG1_TXDMAEN | + STM32H7_SPI_CFG1_RXDMAEN); + + /* Disable interrupts and clear status flags */ + writel_relaxed(0, spi->base + STM32H7_SPI_IER); + writel_relaxed(STM32H7_SPI_IFCR_ALL, spi->base + STM32H7_SPI_IFCR); + + spin_unlock_irqrestore(&spi->lock, flags); +} + +/** + * stm32_spi_can_dma - Determine if the transfer is eligible for DMA use + * @master: controller master interface + * @spi_dev: pointer to the spi device + * @transfer: pointer to spi transfer + * + * If driver has fifo and the current transfer size is greater than fifo size, + * use DMA. Otherwise use DMA for transfer longer than defined DMA min bytes. + */ +static bool stm32_spi_can_dma(struct spi_master *master, + struct spi_device *spi_dev, + struct spi_transfer *transfer) +{ + unsigned int dma_size; + struct stm32_spi *spi = spi_master_get_devdata(master); + + if (spi->cfg->has_fifo) + dma_size = spi->fifo_size; + else + dma_size = SPI_DMA_MIN_BYTES; + + dev_dbg(spi->dev, "%s: %s\n", __func__, + (transfer->len > dma_size) ? "true" : "false"); + + return (transfer->len > dma_size); +} + +/** + * stm32f4_spi_irq_event - Interrupt handler for SPI controller events + * @irq: interrupt line + * @dev_id: SPI controller master interface + */ +static irqreturn_t stm32f4_spi_irq_event(int irq, void *dev_id) +{ + struct spi_master *master = dev_id; + struct stm32_spi *spi = spi_master_get_devdata(master); + u32 sr, mask = 0; + bool end = false; + + spin_lock(&spi->lock); + + sr = readl_relaxed(spi->base + STM32F4_SPI_SR); + /* + * BSY flag is not handled in interrupt but it is normal behavior when + * this flag is set. + */ + sr &= ~STM32F4_SPI_SR_BSY; + + if (!spi->cur_usedma && (spi->cur_comm == SPI_SIMPLEX_TX || + spi->cur_comm == SPI_3WIRE_TX)) { + /* OVR flag shouldn't be handled for TX only mode */ + sr &= ~STM32F4_SPI_SR_OVR | STM32F4_SPI_SR_RXNE; + mask |= STM32F4_SPI_SR_TXE; + } + + if (!spi->cur_usedma && (spi->cur_comm == SPI_FULL_DUPLEX || + spi->cur_comm == SPI_SIMPLEX_RX || + spi->cur_comm == SPI_3WIRE_RX)) { + /* TXE flag is set and is handled when RXNE flag occurs */ + sr &= ~STM32F4_SPI_SR_TXE; + mask |= STM32F4_SPI_SR_RXNE | STM32F4_SPI_SR_OVR; + } + + if (!(sr & mask)) { + dev_dbg(spi->dev, "spurious IT (sr=0x%08x)\n", sr); + spin_unlock(&spi->lock); + return IRQ_NONE; + } + + if (sr & STM32F4_SPI_SR_OVR) { + dev_warn(spi->dev, "Overrun: received value discarded\n"); + + /* Sequence to clear OVR flag */ + readl_relaxed(spi->base + STM32F4_SPI_DR); + readl_relaxed(spi->base + STM32F4_SPI_SR); + + /* + * If overrun is detected, it means that something went wrong, + * so stop the current transfer. Transfer can wait for next + * RXNE but DR is already read and end never happens. + */ + end = true; + goto end_irq; + } + + if (sr & STM32F4_SPI_SR_TXE) { + if (spi->tx_buf) + stm32f4_spi_write_tx(spi); + if (spi->tx_len == 0) + end = true; + } + + if (sr & STM32F4_SPI_SR_RXNE) { + stm32f4_spi_read_rx(spi); + if (spi->rx_len == 0) + end = true; + else if (spi->tx_buf)/* Load data for discontinuous mode */ + stm32f4_spi_write_tx(spi); + } + +end_irq: + if (end) { + /* Immediately disable interrupts to do not generate new one */ + stm32_spi_clr_bits(spi, STM32F4_SPI_CR2, + STM32F4_SPI_CR2_TXEIE | + STM32F4_SPI_CR2_RXNEIE | + STM32F4_SPI_CR2_ERRIE); + spin_unlock(&spi->lock); + return IRQ_WAKE_THREAD; + } + + spin_unlock(&spi->lock); + return IRQ_HANDLED; +} + +/** + * stm32f4_spi_irq_thread - Thread of interrupt handler for SPI controller + * @irq: interrupt line + * @dev_id: SPI controller master interface + */ +static irqreturn_t stm32f4_spi_irq_thread(int irq, void *dev_id) +{ + struct spi_master *master = dev_id; + struct stm32_spi *spi = spi_master_get_devdata(master); + + spi_finalize_current_transfer(master); + stm32f4_spi_disable(spi); + + return IRQ_HANDLED; +} + +/** + * stm32h7_spi_irq_thread - Thread of interrupt handler for SPI controller + * @irq: interrupt line + * @dev_id: SPI controller master interface + */ +static irqreturn_t stm32h7_spi_irq_thread(int irq, void *dev_id) +{ + struct spi_master *master = dev_id; + struct stm32_spi *spi = spi_master_get_devdata(master); + u32 sr, ier, mask; + unsigned long flags; + bool end = false; + + spin_lock_irqsave(&spi->lock, flags); + + sr = readl_relaxed(spi->base + STM32H7_SPI_SR); + ier = readl_relaxed(spi->base + STM32H7_SPI_IER); + + mask = ier; + /* + * EOTIE enables irq from EOT, SUSP and TXC events. We need to set + * SUSP to acknowledge it later. TXC is automatically cleared + */ + + mask |= STM32H7_SPI_SR_SUSP; + /* + * DXPIE is set in Full-Duplex, one IT will be raised if TXP and RXP + * are set. So in case of Full-Duplex, need to poll TXP and RXP event. + */ + if ((spi->cur_comm == SPI_FULL_DUPLEX) && !spi->cur_usedma) + mask |= STM32H7_SPI_SR_TXP | STM32H7_SPI_SR_RXP; + + if (!(sr & mask)) { + dev_warn(spi->dev, "spurious IT (sr=0x%08x, ier=0x%08x)\n", + sr, ier); + spin_unlock_irqrestore(&spi->lock, flags); + return IRQ_NONE; + } + + if (sr & STM32H7_SPI_SR_SUSP) { + static DEFINE_RATELIMIT_STATE(rs, + DEFAULT_RATELIMIT_INTERVAL * 10, + 1); + ratelimit_set_flags(&rs, RATELIMIT_MSG_ON_RELEASE); + if (__ratelimit(&rs)) + dev_dbg_ratelimited(spi->dev, "Communication suspended\n"); + if (!spi->cur_usedma && (spi->rx_buf && (spi->rx_len > 0))) + stm32h7_spi_read_rxfifo(spi, false); + /* + * If communication is suspended while using DMA, it means + * that something went wrong, so stop the current transfer + */ + if (spi->cur_usedma) + end = true; + } + + if (sr & STM32H7_SPI_SR_MODF) { + dev_warn(spi->dev, "Mode fault: transfer aborted\n"); + end = true; + } + + if (sr & STM32H7_SPI_SR_OVR) { + dev_err(spi->dev, "Overrun: RX data lost\n"); + end = true; + } + + if (sr & STM32H7_SPI_SR_EOT) { + if (!spi->cur_usedma && (spi->rx_buf && (spi->rx_len > 0))) + stm32h7_spi_read_rxfifo(spi, true); + end = true; + } + + if (sr & STM32H7_SPI_SR_TXP) + if (!spi->cur_usedma && (spi->tx_buf && (spi->tx_len > 0))) + stm32h7_spi_write_txfifo(spi); + + if (sr & STM32H7_SPI_SR_RXP) + if (!spi->cur_usedma && (spi->rx_buf && (spi->rx_len > 0))) + stm32h7_spi_read_rxfifo(spi, false); + + writel_relaxed(sr & mask, spi->base + STM32H7_SPI_IFCR); + + spin_unlock_irqrestore(&spi->lock, flags); + + if (end) { + stm32h7_spi_disable(spi); + spi_finalize_current_transfer(master); + } + + return IRQ_HANDLED; +} + +/** + * stm32_spi_prepare_msg - set up the controller to transfer a single message + * @master: controller master interface + * @msg: pointer to spi message + */ +static int stm32_spi_prepare_msg(struct spi_master *master, + struct spi_message *msg) +{ + struct stm32_spi *spi = spi_master_get_devdata(master); + struct spi_device *spi_dev = msg->spi; + struct device_node *np = spi_dev->dev.of_node; + unsigned long flags; + u32 clrb = 0, setb = 0; + + /* SPI slave device may need time between data frames */ + spi->cur_midi = 0; + if (np && !of_property_read_u32(np, "st,spi-midi-ns", &spi->cur_midi)) + dev_dbg(spi->dev, "%dns inter-data idleness\n", spi->cur_midi); + + if (spi_dev->mode & SPI_CPOL) + setb |= spi->cfg->regs->cpol.mask; + else + clrb |= spi->cfg->regs->cpol.mask; + + if (spi_dev->mode & SPI_CPHA) + setb |= spi->cfg->regs->cpha.mask; + else + clrb |= spi->cfg->regs->cpha.mask; + + if (spi_dev->mode & SPI_LSB_FIRST) + setb |= spi->cfg->regs->lsb_first.mask; + else + clrb |= spi->cfg->regs->lsb_first.mask; + + dev_dbg(spi->dev, "cpol=%d cpha=%d lsb_first=%d cs_high=%d\n", + spi_dev->mode & SPI_CPOL, + spi_dev->mode & SPI_CPHA, + spi_dev->mode & SPI_LSB_FIRST, + spi_dev->mode & SPI_CS_HIGH); + + spin_lock_irqsave(&spi->lock, flags); + + /* CPOL, CPHA and LSB FIRST bits have common register */ + if (clrb || setb) + writel_relaxed( + (readl_relaxed(spi->base + spi->cfg->regs->cpol.reg) & + ~clrb) | setb, + spi->base + spi->cfg->regs->cpol.reg); + + spin_unlock_irqrestore(&spi->lock, flags); + + return 0; +} + +/** + * stm32f4_spi_dma_tx_cb - dma callback + * @data: pointer to the spi controller data structure + * + * DMA callback is called when the transfer is complete for DMA TX channel. + */ +static void stm32f4_spi_dma_tx_cb(void *data) +{ + struct stm32_spi *spi = data; + + if (spi->cur_comm == SPI_SIMPLEX_TX || spi->cur_comm == SPI_3WIRE_TX) { + spi_finalize_current_transfer(spi->master); + stm32f4_spi_disable(spi); + } +} + +/** + * stm32f4_spi_dma_rx_cb - dma callback + * @data: pointer to the spi controller data structure + * + * DMA callback is called when the transfer is complete for DMA RX channel. + */ +static void stm32f4_spi_dma_rx_cb(void *data) +{ + struct stm32_spi *spi = data; + + spi_finalize_current_transfer(spi->master); + stm32f4_spi_disable(spi); +} + +/** + * stm32h7_spi_dma_cb - dma callback + * @data: pointer to the spi controller data structure + * + * DMA callback is called when the transfer is complete or when an error + * occurs. If the transfer is complete, EOT flag is raised. + */ +static void stm32h7_spi_dma_cb(void *data) +{ + struct stm32_spi *spi = data; + unsigned long flags; + u32 sr; + + spin_lock_irqsave(&spi->lock, flags); + + sr = readl_relaxed(spi->base + STM32H7_SPI_SR); + + spin_unlock_irqrestore(&spi->lock, flags); + + if (!(sr & STM32H7_SPI_SR_EOT)) + dev_warn(spi->dev, "DMA error (sr=0x%08x)\n", sr); + + /* Now wait for EOT, or SUSP or OVR in case of error */ +} + +/** + * stm32_spi_dma_config - configure dma slave channel depending on current + * transfer bits_per_word. + * @spi: pointer to the spi controller data structure + * @dma_conf: pointer to the dma_slave_config structure + * @dir: direction of the dma transfer + */ +static void stm32_spi_dma_config(struct stm32_spi *spi, + struct dma_slave_config *dma_conf, + enum dma_transfer_direction dir) +{ + enum dma_slave_buswidth buswidth; + u32 maxburst; + + if (spi->cur_bpw <= 8) + buswidth = DMA_SLAVE_BUSWIDTH_1_BYTE; + else if (spi->cur_bpw <= 16) + buswidth = DMA_SLAVE_BUSWIDTH_2_BYTES; + else + buswidth = DMA_SLAVE_BUSWIDTH_4_BYTES; + + if (spi->cfg->has_fifo) { + /* Valid for DMA Half or Full Fifo threshold */ + if (spi->cur_fthlv == 2) + maxburst = 1; + else + maxburst = spi->cur_fthlv; + } else { + maxburst = 1; + } + + memset(dma_conf, 0, sizeof(struct dma_slave_config)); + dma_conf->direction = dir; + if (dma_conf->direction == DMA_DEV_TO_MEM) { /* RX */ + dma_conf->src_addr = spi->phys_addr + spi->cfg->regs->rx.reg; + dma_conf->src_addr_width = buswidth; + dma_conf->src_maxburst = maxburst; + + dev_dbg(spi->dev, "Rx DMA config buswidth=%d, maxburst=%d\n", + buswidth, maxburst); + } else if (dma_conf->direction == DMA_MEM_TO_DEV) { /* TX */ + dma_conf->dst_addr = spi->phys_addr + spi->cfg->regs->tx.reg; + dma_conf->dst_addr_width = buswidth; + dma_conf->dst_maxburst = maxburst; + + dev_dbg(spi->dev, "Tx DMA config buswidth=%d, maxburst=%d\n", + buswidth, maxburst); + } +} + +/** + * stm32f4_spi_transfer_one_irq - transfer a single spi_transfer using + * interrupts + * @spi: pointer to the spi controller data structure + * + * It must returns 0 if the transfer is finished or 1 if the transfer is still + * in progress. + */ +static int stm32f4_spi_transfer_one_irq(struct stm32_spi *spi) +{ + unsigned long flags; + u32 cr2 = 0; + + /* Enable the interrupts relative to the current communication mode */ + if (spi->cur_comm == SPI_SIMPLEX_TX || spi->cur_comm == SPI_3WIRE_TX) { + cr2 |= STM32F4_SPI_CR2_TXEIE; + } else if (spi->cur_comm == SPI_FULL_DUPLEX || + spi->cur_comm == SPI_SIMPLEX_RX || + spi->cur_comm == SPI_3WIRE_RX) { + /* In transmit-only mode, the OVR flag is set in the SR register + * since the received data are never read. Therefore set OVR + * interrupt only when rx buffer is available. + */ + cr2 |= STM32F4_SPI_CR2_RXNEIE | STM32F4_SPI_CR2_ERRIE; + } else { + return -EINVAL; + } + + spin_lock_irqsave(&spi->lock, flags); + + stm32_spi_set_bits(spi, STM32F4_SPI_CR2, cr2); + + stm32_spi_enable(spi); + + /* starting data transfer when buffer is loaded */ + if (spi->tx_buf) + stm32f4_spi_write_tx(spi); + + spin_unlock_irqrestore(&spi->lock, flags); + + return 1; +} + +/** + * stm32h7_spi_transfer_one_irq - transfer a single spi_transfer using + * interrupts + * @spi: pointer to the spi controller data structure + * + * It must returns 0 if the transfer is finished or 1 if the transfer is still + * in progress. + */ +static int stm32h7_spi_transfer_one_irq(struct stm32_spi *spi) +{ + unsigned long flags; + u32 ier = 0; + + /* Enable the interrupts relative to the current communication mode */ + if (spi->tx_buf && spi->rx_buf) /* Full Duplex */ + ier |= STM32H7_SPI_IER_DXPIE; + else if (spi->tx_buf) /* Half-Duplex TX dir or Simplex TX */ + ier |= STM32H7_SPI_IER_TXPIE; + else if (spi->rx_buf) /* Half-Duplex RX dir or Simplex RX */ + ier |= STM32H7_SPI_IER_RXPIE; + + /* Enable the interrupts relative to the end of transfer */ + ier |= STM32H7_SPI_IER_EOTIE | STM32H7_SPI_IER_TXTFIE | + STM32H7_SPI_IER_OVRIE | STM32H7_SPI_IER_MODFIE; + + spin_lock_irqsave(&spi->lock, flags); + + stm32_spi_enable(spi); + + /* Be sure to have data in fifo before starting data transfer */ + if (spi->tx_buf) + stm32h7_spi_write_txfifo(spi); + + stm32_spi_set_bits(spi, STM32H7_SPI_CR1, STM32H7_SPI_CR1_CSTART); + + writel_relaxed(ier, spi->base + STM32H7_SPI_IER); + + spin_unlock_irqrestore(&spi->lock, flags); + + return 1; +} + +/** + * stm32f4_spi_transfer_one_dma_start - Set SPI driver registers to start + * transfer using DMA + * @spi: pointer to the spi controller data structure + */ +static void stm32f4_spi_transfer_one_dma_start(struct stm32_spi *spi) +{ + /* In DMA mode end of transfer is handled by DMA TX or RX callback. */ + if (spi->cur_comm == SPI_SIMPLEX_RX || spi->cur_comm == SPI_3WIRE_RX || + spi->cur_comm == SPI_FULL_DUPLEX) { + /* + * In transmit-only mode, the OVR flag is set in the SR register + * since the received data are never read. Therefore set OVR + * interrupt only when rx buffer is available. + */ + stm32_spi_set_bits(spi, STM32F4_SPI_CR2, STM32F4_SPI_CR2_ERRIE); + } + + stm32_spi_enable(spi); +} + +/** + * stm32h7_spi_transfer_one_dma_start - Set SPI driver registers to start + * transfer using DMA + * @spi: pointer to the spi controller data structure + */ +static void stm32h7_spi_transfer_one_dma_start(struct stm32_spi *spi) +{ + /* Enable the interrupts relative to the end of transfer */ + stm32_spi_set_bits(spi, STM32H7_SPI_IER, STM32H7_SPI_IER_EOTIE | + STM32H7_SPI_IER_TXTFIE | + STM32H7_SPI_IER_OVRIE | + STM32H7_SPI_IER_MODFIE); + + stm32_spi_enable(spi); + + stm32_spi_set_bits(spi, STM32H7_SPI_CR1, STM32H7_SPI_CR1_CSTART); +} + +/** + * stm32_spi_transfer_one_dma - transfer a single spi_transfer using DMA + * @spi: pointer to the spi controller data structure + * @xfer: pointer to the spi_transfer structure + * + * It must returns 0 if the transfer is finished or 1 if the transfer is still + * in progress. + */ +static int stm32_spi_transfer_one_dma(struct stm32_spi *spi, + struct spi_transfer *xfer) +{ + struct dma_slave_config tx_dma_conf, rx_dma_conf; + struct dma_async_tx_descriptor *tx_dma_desc, *rx_dma_desc; + unsigned long flags; + + spin_lock_irqsave(&spi->lock, flags); + + rx_dma_desc = NULL; + if (spi->rx_buf && spi->dma_rx) { + stm32_spi_dma_config(spi, &rx_dma_conf, DMA_DEV_TO_MEM); + dmaengine_slave_config(spi->dma_rx, &rx_dma_conf); + + /* Enable Rx DMA request */ + stm32_spi_set_bits(spi, spi->cfg->regs->dma_rx_en.reg, + spi->cfg->regs->dma_rx_en.mask); + + rx_dma_desc = dmaengine_prep_slave_sg( + spi->dma_rx, xfer->rx_sg.sgl, + xfer->rx_sg.nents, + rx_dma_conf.direction, + DMA_PREP_INTERRUPT); + } + + tx_dma_desc = NULL; + if (spi->tx_buf && spi->dma_tx) { + stm32_spi_dma_config(spi, &tx_dma_conf, DMA_MEM_TO_DEV); + dmaengine_slave_config(spi->dma_tx, &tx_dma_conf); + + tx_dma_desc = dmaengine_prep_slave_sg( + spi->dma_tx, xfer->tx_sg.sgl, + xfer->tx_sg.nents, + tx_dma_conf.direction, + DMA_PREP_INTERRUPT); + } + + if ((spi->tx_buf && spi->dma_tx && !tx_dma_desc) || + (spi->rx_buf && spi->dma_rx && !rx_dma_desc)) + goto dma_desc_error; + + if (spi->cur_comm == SPI_FULL_DUPLEX && (!tx_dma_desc || !rx_dma_desc)) + goto dma_desc_error; + + if (rx_dma_desc) { + rx_dma_desc->callback = spi->cfg->dma_rx_cb; + rx_dma_desc->callback_param = spi; + + if (dma_submit_error(dmaengine_submit(rx_dma_desc))) { + dev_err(spi->dev, "Rx DMA submit failed\n"); + goto dma_desc_error; + } + /* Enable Rx DMA channel */ + dma_async_issue_pending(spi->dma_rx); + } + + if (tx_dma_desc) { + if (spi->cur_comm == SPI_SIMPLEX_TX || + spi->cur_comm == SPI_3WIRE_TX) { + tx_dma_desc->callback = spi->cfg->dma_tx_cb; + tx_dma_desc->callback_param = spi; + } + + if (dma_submit_error(dmaengine_submit(tx_dma_desc))) { + dev_err(spi->dev, "Tx DMA submit failed\n"); + goto dma_submit_error; + } + /* Enable Tx DMA channel */ + dma_async_issue_pending(spi->dma_tx); + + /* Enable Tx DMA request */ + stm32_spi_set_bits(spi, spi->cfg->regs->dma_tx_en.reg, + spi->cfg->regs->dma_tx_en.mask); + } + + spi->cfg->transfer_one_dma_start(spi); + + spin_unlock_irqrestore(&spi->lock, flags); + + return 1; + +dma_submit_error: + if (spi->dma_rx) + dmaengine_terminate_all(spi->dma_rx); + +dma_desc_error: + stm32_spi_clr_bits(spi, spi->cfg->regs->dma_rx_en.reg, + spi->cfg->regs->dma_rx_en.mask); + + spin_unlock_irqrestore(&spi->lock, flags); + + dev_info(spi->dev, "DMA issue: fall back to irq transfer\n"); + + spi->cur_usedma = false; + return spi->cfg->transfer_one_irq(spi); +} + +/** + * stm32f4_spi_set_bpw - Configure bits per word + * @spi: pointer to the spi controller data structure + */ +static void stm32f4_spi_set_bpw(struct stm32_spi *spi) +{ + if (spi->cur_bpw == 16) + stm32_spi_set_bits(spi, STM32F4_SPI_CR1, STM32F4_SPI_CR1_DFF); + else + stm32_spi_clr_bits(spi, STM32F4_SPI_CR1, STM32F4_SPI_CR1_DFF); +} + +/** + * stm32h7_spi_set_bpw - configure bits per word + * @spi: pointer to the spi controller data structure + */ +static void stm32h7_spi_set_bpw(struct stm32_spi *spi) +{ + u32 bpw, fthlv; + u32 cfg1_clrb = 0, cfg1_setb = 0; + + bpw = spi->cur_bpw - 1; + + cfg1_clrb |= STM32H7_SPI_CFG1_DSIZE; + cfg1_setb |= (bpw << STM32H7_SPI_CFG1_DSIZE_SHIFT) & + STM32H7_SPI_CFG1_DSIZE; + + spi->cur_fthlv = stm32h7_spi_prepare_fthlv(spi, spi->cur_xferlen); + fthlv = spi->cur_fthlv - 1; + + cfg1_clrb |= STM32H7_SPI_CFG1_FTHLV; + cfg1_setb |= (fthlv << STM32H7_SPI_CFG1_FTHLV_SHIFT) & + STM32H7_SPI_CFG1_FTHLV; + + writel_relaxed( + (readl_relaxed(spi->base + STM32H7_SPI_CFG1) & + ~cfg1_clrb) | cfg1_setb, + spi->base + STM32H7_SPI_CFG1); +} + +/** + * stm32_spi_set_mbr - Configure baud rate divisor in master mode + * @spi: pointer to the spi controller data structure + * @mbrdiv: baud rate divisor value + */ +static void stm32_spi_set_mbr(struct stm32_spi *spi, u32 mbrdiv) +{ + u32 clrb = 0, setb = 0; + + clrb |= spi->cfg->regs->br.mask; + setb |= ((u32)mbrdiv << spi->cfg->regs->br.shift) & + spi->cfg->regs->br.mask; + + writel_relaxed((readl_relaxed(spi->base + spi->cfg->regs->br.reg) & + ~clrb) | setb, + spi->base + spi->cfg->regs->br.reg); +} + +/** + * stm32_spi_communication_type - return transfer communication type + * @spi_dev: pointer to the spi device + * @transfer: pointer to spi transfer + */ +static unsigned int stm32_spi_communication_type(struct spi_device *spi_dev, + struct spi_transfer *transfer) +{ + unsigned int type = SPI_FULL_DUPLEX; + + if (spi_dev->mode & SPI_3WIRE) { /* MISO/MOSI signals shared */ + /* + * SPI_3WIRE and xfer->tx_buf != NULL and xfer->rx_buf != NULL + * is forbidden and unvalidated by SPI subsystem so depending + * on the valid buffer, we can determine the direction of the + * transfer. + */ + if (!transfer->tx_buf) + type = SPI_3WIRE_RX; + else + type = SPI_3WIRE_TX; + } else { + if (!transfer->tx_buf) + type = SPI_SIMPLEX_RX; + else if (!transfer->rx_buf) + type = SPI_SIMPLEX_TX; + } + + return type; +} + +/** + * stm32f4_spi_set_mode - configure communication mode + * @spi: pointer to the spi controller data structure + * @comm_type: type of communication to configure + */ +static int stm32f4_spi_set_mode(struct stm32_spi *spi, unsigned int comm_type) +{ + if (comm_type == SPI_3WIRE_TX || comm_type == SPI_SIMPLEX_TX) { + stm32_spi_set_bits(spi, STM32F4_SPI_CR1, + STM32F4_SPI_CR1_BIDIMODE | + STM32F4_SPI_CR1_BIDIOE); + } else if (comm_type == SPI_FULL_DUPLEX || + comm_type == SPI_SIMPLEX_RX) { + stm32_spi_clr_bits(spi, STM32F4_SPI_CR1, + STM32F4_SPI_CR1_BIDIMODE | + STM32F4_SPI_CR1_BIDIOE); + } else if (comm_type == SPI_3WIRE_RX) { + stm32_spi_set_bits(spi, STM32F4_SPI_CR1, + STM32F4_SPI_CR1_BIDIMODE); + stm32_spi_clr_bits(spi, STM32F4_SPI_CR1, + STM32F4_SPI_CR1_BIDIOE); + } else { + return -EINVAL; + } + + return 0; +} + +/** + * stm32h7_spi_set_mode - configure communication mode + * @spi: pointer to the spi controller data structure + * @comm_type: type of communication to configure + */ +static int stm32h7_spi_set_mode(struct stm32_spi *spi, unsigned int comm_type) +{ + u32 mode; + u32 cfg2_clrb = 0, cfg2_setb = 0; + + if (comm_type == SPI_3WIRE_RX) { + mode = STM32H7_SPI_HALF_DUPLEX; + stm32_spi_clr_bits(spi, STM32H7_SPI_CR1, STM32H7_SPI_CR1_HDDIR); + } else if (comm_type == SPI_3WIRE_TX) { + mode = STM32H7_SPI_HALF_DUPLEX; + stm32_spi_set_bits(spi, STM32H7_SPI_CR1, STM32H7_SPI_CR1_HDDIR); + } else if (comm_type == SPI_SIMPLEX_RX) { + mode = STM32H7_SPI_SIMPLEX_RX; + } else if (comm_type == SPI_SIMPLEX_TX) { + mode = STM32H7_SPI_SIMPLEX_TX; + } else { + mode = STM32H7_SPI_FULL_DUPLEX; + } + + cfg2_clrb |= STM32H7_SPI_CFG2_COMM; + cfg2_setb |= (mode << STM32H7_SPI_CFG2_COMM_SHIFT) & + STM32H7_SPI_CFG2_COMM; + + writel_relaxed( + (readl_relaxed(spi->base + STM32H7_SPI_CFG2) & + ~cfg2_clrb) | cfg2_setb, + spi->base + STM32H7_SPI_CFG2); + + return 0; +} + +/** + * stm32h7_spi_data_idleness - configure minimum time delay inserted between two + * consecutive data frames in master mode + * @spi: pointer to the spi controller data structure + * @len: transfer len + */ +static void stm32h7_spi_data_idleness(struct stm32_spi *spi, u32 len) +{ + u32 cfg2_clrb = 0, cfg2_setb = 0; + + cfg2_clrb |= STM32H7_SPI_CFG2_MIDI; + if ((len > 1) && (spi->cur_midi > 0)) { + u32 sck_period_ns = DIV_ROUND_UP(SPI_1HZ_NS, spi->cur_speed); + u32 midi = min((u32)DIV_ROUND_UP(spi->cur_midi, sck_period_ns), + (u32)STM32H7_SPI_CFG2_MIDI >> + STM32H7_SPI_CFG2_MIDI_SHIFT); + + dev_dbg(spi->dev, "period=%dns, midi=%d(=%dns)\n", + sck_period_ns, midi, midi * sck_period_ns); + cfg2_setb |= (midi << STM32H7_SPI_CFG2_MIDI_SHIFT) & + STM32H7_SPI_CFG2_MIDI; + } + + writel_relaxed((readl_relaxed(spi->base + STM32H7_SPI_CFG2) & + ~cfg2_clrb) | cfg2_setb, + spi->base + STM32H7_SPI_CFG2); +} + +/** + * stm32h7_spi_number_of_data - configure number of data at current transfer + * @spi: pointer to the spi controller data structure + * @nb_words: transfer length (in words) + */ +static int stm32h7_spi_number_of_data(struct stm32_spi *spi, u32 nb_words) +{ + u32 cr2_clrb = 0, cr2_setb = 0; + + if (nb_words <= (STM32H7_SPI_CR2_TSIZE >> + STM32H7_SPI_CR2_TSIZE_SHIFT)) { + cr2_clrb |= STM32H7_SPI_CR2_TSIZE; + cr2_setb = nb_words << STM32H7_SPI_CR2_TSIZE_SHIFT; + writel_relaxed((readl_relaxed(spi->base + STM32H7_SPI_CR2) & + ~cr2_clrb) | cr2_setb, + spi->base + STM32H7_SPI_CR2); + } else { + return -EMSGSIZE; + } + + return 0; +} + +/** + * stm32_spi_transfer_one_setup - common setup to transfer a single + * spi_transfer either using DMA or + * interrupts. + * @spi: pointer to the spi controller data structure + * @spi_dev: pointer to the spi device + * @transfer: pointer to spi transfer + */ +static int stm32_spi_transfer_one_setup(struct stm32_spi *spi, + struct spi_device *spi_dev, + struct spi_transfer *transfer) +{ + unsigned long flags; + unsigned int comm_type; + int nb_words, ret = 0; + int mbr; + + spin_lock_irqsave(&spi->lock, flags); + + spi->cur_xferlen = transfer->len; + + spi->cur_bpw = transfer->bits_per_word; + spi->cfg->set_bpw(spi); + + /* Update spi->cur_speed with real clock speed */ + mbr = stm32_spi_prepare_mbr(spi, transfer->speed_hz, + spi->cfg->baud_rate_div_min, + spi->cfg->baud_rate_div_max); + if (mbr < 0) { + ret = mbr; + goto out; + } + + transfer->speed_hz = spi->cur_speed; + stm32_spi_set_mbr(spi, mbr); + + comm_type = stm32_spi_communication_type(spi_dev, transfer); + ret = spi->cfg->set_mode(spi, comm_type); + if (ret < 0) + goto out; + + spi->cur_comm = comm_type; + + if (spi->cfg->set_data_idleness) + spi->cfg->set_data_idleness(spi, transfer->len); + + if (spi->cur_bpw <= 8) + nb_words = transfer->len; + else if (spi->cur_bpw <= 16) + nb_words = DIV_ROUND_UP(transfer->len * 8, 16); + else + nb_words = DIV_ROUND_UP(transfer->len * 8, 32); + + if (spi->cfg->set_number_of_data) { + ret = spi->cfg->set_number_of_data(spi, nb_words); + if (ret < 0) + goto out; + } + + dev_dbg(spi->dev, "transfer communication mode set to %d\n", + spi->cur_comm); + dev_dbg(spi->dev, + "data frame of %d-bit, data packet of %d data frames\n", + spi->cur_bpw, spi->cur_fthlv); + dev_dbg(spi->dev, "speed set to %dHz\n", spi->cur_speed); + dev_dbg(spi->dev, "transfer of %d bytes (%d data frames)\n", + spi->cur_xferlen, nb_words); + dev_dbg(spi->dev, "dma %s\n", + (spi->cur_usedma) ? "enabled" : "disabled"); + +out: + spin_unlock_irqrestore(&spi->lock, flags); + + return ret; +} + +/** + * stm32_spi_transfer_one - transfer a single spi_transfer + * @master: controller master interface + * @spi_dev: pointer to the spi device + * @transfer: pointer to spi transfer + * + * It must return 0 if the transfer is finished or 1 if the transfer is still + * in progress. + */ +static int stm32_spi_transfer_one(struct spi_master *master, + struct spi_device *spi_dev, + struct spi_transfer *transfer) +{ + struct stm32_spi *spi = spi_master_get_devdata(master); + int ret; + + /* Don't do anything on 0 bytes transfers */ + if (transfer->len == 0) + return 0; + + spi->tx_buf = transfer->tx_buf; + spi->rx_buf = transfer->rx_buf; + spi->tx_len = spi->tx_buf ? transfer->len : 0; + spi->rx_len = spi->rx_buf ? transfer->len : 0; + + spi->cur_usedma = (master->can_dma && + master->can_dma(master, spi_dev, transfer)); + + ret = stm32_spi_transfer_one_setup(spi, spi_dev, transfer); + if (ret) { + dev_err(spi->dev, "SPI transfer setup failed\n"); + return ret; + } + + if (spi->cur_usedma) + return stm32_spi_transfer_one_dma(spi, transfer); + else + return spi->cfg->transfer_one_irq(spi); +} + +/** + * stm32_spi_unprepare_msg - relax the hardware + * @master: controller master interface + * @msg: pointer to the spi message + */ +static int stm32_spi_unprepare_msg(struct spi_master *master, + struct spi_message *msg) +{ + struct stm32_spi *spi = spi_master_get_devdata(master); + + spi->cfg->disable(spi); + + return 0; +} + +/** + * stm32f4_spi_config - Configure SPI controller as SPI master + * @spi: pointer to the spi controller data structure + */ +static int stm32f4_spi_config(struct stm32_spi *spi) +{ + unsigned long flags; + + spin_lock_irqsave(&spi->lock, flags); + + /* Ensure I2SMOD bit is kept cleared */ + stm32_spi_clr_bits(spi, STM32F4_SPI_I2SCFGR, + STM32F4_SPI_I2SCFGR_I2SMOD); + + /* + * - SS input value high + * - transmitter half duplex direction + * - Set the master mode (default Motorola mode) + * - Consider 1 master/n slaves configuration and + * SS input value is determined by the SSI bit + */ + stm32_spi_set_bits(spi, STM32F4_SPI_CR1, STM32F4_SPI_CR1_SSI | + STM32F4_SPI_CR1_BIDIOE | + STM32F4_SPI_CR1_MSTR | + STM32F4_SPI_CR1_SSM); + + spin_unlock_irqrestore(&spi->lock, flags); + + return 0; +} + +/** + * stm32h7_spi_config - Configure SPI controller as SPI master + * @spi: pointer to the spi controller data structure + */ +static int stm32h7_spi_config(struct stm32_spi *spi) +{ + unsigned long flags; + + spin_lock_irqsave(&spi->lock, flags); + + /* Ensure I2SMOD bit is kept cleared */ + stm32_spi_clr_bits(spi, STM32H7_SPI_I2SCFGR, + STM32H7_SPI_I2SCFGR_I2SMOD); + + /* + * - SS input value high + * - transmitter half duplex direction + * - automatic communication suspend when RX-Fifo is full + */ + stm32_spi_set_bits(spi, STM32H7_SPI_CR1, STM32H7_SPI_CR1_SSI | + STM32H7_SPI_CR1_HDDIR | + STM32H7_SPI_CR1_MASRX); + + /* + * - Set the master mode (default Motorola mode) + * - Consider 1 master/n slaves configuration and + * SS input value is determined by the SSI bit + * - keep control of all associated GPIOs + */ + stm32_spi_set_bits(spi, STM32H7_SPI_CFG2, STM32H7_SPI_CFG2_MASTER | + STM32H7_SPI_CFG2_SSM | + STM32H7_SPI_CFG2_AFCNTR); + + spin_unlock_irqrestore(&spi->lock, flags); + + return 0; +} + +static const struct stm32_spi_cfg stm32f4_spi_cfg = { + .regs = &stm32f4_spi_regspec, + .get_bpw_mask = stm32f4_spi_get_bpw_mask, + .disable = stm32f4_spi_disable, + .config = stm32f4_spi_config, + .set_bpw = stm32f4_spi_set_bpw, + .set_mode = stm32f4_spi_set_mode, + .transfer_one_dma_start = stm32f4_spi_transfer_one_dma_start, + .dma_tx_cb = stm32f4_spi_dma_tx_cb, + .dma_rx_cb = stm32f4_spi_dma_rx_cb, + .transfer_one_irq = stm32f4_spi_transfer_one_irq, + .irq_handler_event = stm32f4_spi_irq_event, + .irq_handler_thread = stm32f4_spi_irq_thread, + .baud_rate_div_min = STM32F4_SPI_BR_DIV_MIN, + .baud_rate_div_max = STM32F4_SPI_BR_DIV_MAX, + .has_fifo = false, +}; + +static const struct stm32_spi_cfg stm32h7_spi_cfg = { + .regs = &stm32h7_spi_regspec, + .get_fifo_size = stm32h7_spi_get_fifo_size, + .get_bpw_mask = stm32h7_spi_get_bpw_mask, + .disable = stm32h7_spi_disable, + .config = stm32h7_spi_config, + .set_bpw = stm32h7_spi_set_bpw, + .set_mode = stm32h7_spi_set_mode, + .set_data_idleness = stm32h7_spi_data_idleness, + .set_number_of_data = stm32h7_spi_number_of_data, + .transfer_one_dma_start = stm32h7_spi_transfer_one_dma_start, + .dma_rx_cb = stm32h7_spi_dma_cb, + .dma_tx_cb = stm32h7_spi_dma_cb, + .transfer_one_irq = stm32h7_spi_transfer_one_irq, + .irq_handler_thread = stm32h7_spi_irq_thread, + .baud_rate_div_min = STM32H7_SPI_MBR_DIV_MIN, + .baud_rate_div_max = STM32H7_SPI_MBR_DIV_MAX, + .has_fifo = true, +}; + +static const struct of_device_id stm32_spi_of_match[] = { + { .compatible = "st,stm32h7-spi", .data = (void *)&stm32h7_spi_cfg }, + { .compatible = "st,stm32f4-spi", .data = (void *)&stm32f4_spi_cfg }, + {}, +}; +MODULE_DEVICE_TABLE(of, stm32_spi_of_match); + +static int stm32_spi_probe(struct platform_device *pdev) +{ + struct spi_master *master; + struct stm32_spi *spi; + struct resource *res; + int ret; + + master = devm_spi_alloc_master(&pdev->dev, sizeof(struct stm32_spi)); + if (!master) { + dev_err(&pdev->dev, "spi master allocation failed\n"); + return -ENOMEM; + } + platform_set_drvdata(pdev, master); + + spi = spi_master_get_devdata(master); + spi->dev = &pdev->dev; + spi->master = master; + spin_lock_init(&spi->lock); + + spi->cfg = (const struct stm32_spi_cfg *) + of_match_device(pdev->dev.driver->of_match_table, + &pdev->dev)->data; + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + spi->base = devm_ioremap_resource(&pdev->dev, res); + if (IS_ERR(spi->base)) + return PTR_ERR(spi->base); + + spi->phys_addr = (dma_addr_t)res->start; + + spi->irq = platform_get_irq(pdev, 0); + if (spi->irq <= 0) + return dev_err_probe(&pdev->dev, spi->irq, + "failed to get irq\n"); + + ret = devm_request_threaded_irq(&pdev->dev, spi->irq, + spi->cfg->irq_handler_event, + spi->cfg->irq_handler_thread, + IRQF_ONESHOT, pdev->name, master); + if (ret) { + dev_err(&pdev->dev, "irq%d request failed: %d\n", spi->irq, + ret); + return ret; + } + + spi->clk = devm_clk_get(&pdev->dev, NULL); + if (IS_ERR(spi->clk)) { + ret = PTR_ERR(spi->clk); + dev_err(&pdev->dev, "clk get failed: %d\n", ret); + return ret; + } + + ret = clk_prepare_enable(spi->clk); + if (ret) { + dev_err(&pdev->dev, "clk enable failed: %d\n", ret); + return ret; + } + spi->clk_rate = clk_get_rate(spi->clk); + if (!spi->clk_rate) { + dev_err(&pdev->dev, "clk rate = 0\n"); + ret = -EINVAL; + goto err_clk_disable; + } + + spi->rst = devm_reset_control_get_exclusive(&pdev->dev, NULL); + if (!IS_ERR(spi->rst)) { + reset_control_assert(spi->rst); + udelay(2); + reset_control_deassert(spi->rst); + } + + if (spi->cfg->has_fifo) + spi->fifo_size = spi->cfg->get_fifo_size(spi); + + ret = spi->cfg->config(spi); + if (ret) { + dev_err(&pdev->dev, "controller configuration failed: %d\n", + ret); + goto err_clk_disable; + } + + master->dev.of_node = pdev->dev.of_node; + master->auto_runtime_pm = true; + master->bus_num = pdev->id; + master->mode_bits = SPI_CPHA | SPI_CPOL | SPI_CS_HIGH | SPI_LSB_FIRST | + SPI_3WIRE; + master->bits_per_word_mask = spi->cfg->get_bpw_mask(spi); + master->max_speed_hz = spi->clk_rate / spi->cfg->baud_rate_div_min; + master->min_speed_hz = spi->clk_rate / spi->cfg->baud_rate_div_max; + master->use_gpio_descriptors = true; + master->prepare_message = stm32_spi_prepare_msg; + master->transfer_one = stm32_spi_transfer_one; + master->unprepare_message = stm32_spi_unprepare_msg; + master->flags = SPI_MASTER_MUST_TX; + + spi->dma_tx = dma_request_chan(spi->dev, "tx"); + if (IS_ERR(spi->dma_tx)) { + ret = PTR_ERR(spi->dma_tx); + spi->dma_tx = NULL; + if (ret == -EPROBE_DEFER) + goto err_clk_disable; + + dev_warn(&pdev->dev, "failed to request tx dma channel\n"); + } else { + master->dma_tx = spi->dma_tx; + } + + spi->dma_rx = dma_request_chan(spi->dev, "rx"); + if (IS_ERR(spi->dma_rx)) { + ret = PTR_ERR(spi->dma_rx); + spi->dma_rx = NULL; + if (ret == -EPROBE_DEFER) + goto err_dma_release; + + dev_warn(&pdev->dev, "failed to request rx dma channel\n"); + } else { + master->dma_rx = spi->dma_rx; + } + + if (spi->dma_tx || spi->dma_rx) + master->can_dma = stm32_spi_can_dma; + + pm_runtime_set_active(&pdev->dev); + pm_runtime_get_noresume(&pdev->dev); + pm_runtime_enable(&pdev->dev); + + ret = spi_register_master(master); + if (ret) { + dev_err(&pdev->dev, "spi master registration failed: %d\n", + ret); + goto err_pm_disable; + } + + if (!master->cs_gpiods) { + dev_err(&pdev->dev, "no CS gpios available\n"); + ret = -EINVAL; + goto err_pm_disable; + } + + dev_info(&pdev->dev, "driver initialized\n"); + + return 0; + +err_pm_disable: + pm_runtime_disable(&pdev->dev); + pm_runtime_put_noidle(&pdev->dev); + pm_runtime_set_suspended(&pdev->dev); +err_dma_release: + if (spi->dma_tx) + dma_release_channel(spi->dma_tx); + if (spi->dma_rx) + dma_release_channel(spi->dma_rx); +err_clk_disable: + clk_disable_unprepare(spi->clk); + + return ret; +} + +static int stm32_spi_remove(struct platform_device *pdev) +{ + struct spi_master *master = platform_get_drvdata(pdev); + struct stm32_spi *spi = spi_master_get_devdata(master); + + pm_runtime_get_sync(&pdev->dev); + + spi_unregister_master(master); + spi->cfg->disable(spi); + + pm_runtime_disable(&pdev->dev); + pm_runtime_put_noidle(&pdev->dev); + pm_runtime_set_suspended(&pdev->dev); + if (master->dma_tx) + dma_release_channel(master->dma_tx); + if (master->dma_rx) + dma_release_channel(master->dma_rx); + + clk_disable_unprepare(spi->clk); + + + pinctrl_pm_select_sleep_state(&pdev->dev); + + return 0; +} + +#ifdef CONFIG_PM +static int stm32_spi_runtime_suspend(struct device *dev) +{ + struct spi_master *master = dev_get_drvdata(dev); + struct stm32_spi *spi = spi_master_get_devdata(master); + + clk_disable_unprepare(spi->clk); + + return pinctrl_pm_select_sleep_state(dev); +} + +static int stm32_spi_runtime_resume(struct device *dev) +{ + struct spi_master *master = dev_get_drvdata(dev); + struct stm32_spi *spi = spi_master_get_devdata(master); + int ret; + + ret = pinctrl_pm_select_default_state(dev); + if (ret) + return ret; + + return clk_prepare_enable(spi->clk); +} +#endif + +#ifdef CONFIG_PM_SLEEP +static int stm32_spi_suspend(struct device *dev) +{ + struct spi_master *master = dev_get_drvdata(dev); + int ret; + + ret = spi_master_suspend(master); + if (ret) + return ret; + + return pm_runtime_force_suspend(dev); +} + +static int stm32_spi_resume(struct device *dev) +{ + struct spi_master *master = dev_get_drvdata(dev); + struct stm32_spi *spi = spi_master_get_devdata(master); + int ret; + + ret = pm_runtime_force_resume(dev); + if (ret) + return ret; + + ret = spi_master_resume(master); + if (ret) { + clk_disable_unprepare(spi->clk); + return ret; + } + + ret = pm_runtime_get_sync(dev); + if (ret < 0) { + pm_runtime_put_noidle(dev); + dev_err(dev, "Unable to power device:%d\n", ret); + return ret; + } + + spi->cfg->config(spi); + + pm_runtime_mark_last_busy(dev); + pm_runtime_put_autosuspend(dev); + + return 0; +} +#endif + +static const struct dev_pm_ops stm32_spi_pm_ops = { + SET_SYSTEM_SLEEP_PM_OPS(stm32_spi_suspend, stm32_spi_resume) + SET_RUNTIME_PM_OPS(stm32_spi_runtime_suspend, + stm32_spi_runtime_resume, NULL) +}; + +static struct platform_driver stm32_spi_driver = { + .probe = stm32_spi_probe, + .remove = stm32_spi_remove, + .driver = { + .name = DRIVER_NAME, + .pm = &stm32_spi_pm_ops, + .of_match_table = stm32_spi_of_match, + }, +}; + +module_platform_driver(stm32_spi_driver); + +MODULE_ALIAS("platform:" DRIVER_NAME); +MODULE_DESCRIPTION("STMicroelectronics STM32 SPI Controller driver"); +MODULE_AUTHOR("Amelie Delaunay <amelie.delaunay@st.com>"); +MODULE_LICENSE("GPL v2"); diff --git a/drivers/spi/spi-sun4i.c b/drivers/spi/spi-sun4i.c new file mode 100644 index 000000000..1fdfc6e66 --- /dev/null +++ b/drivers/spi/spi-sun4i.c @@ -0,0 +1,551 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Copyright (C) 2012 - 2014 Allwinner Tech + * Pan Nan <pannan@allwinnertech.com> + * + * Copyright (C) 2014 Maxime Ripard + * Maxime Ripard <maxime.ripard@free-electrons.com> + */ + +#include <linux/clk.h> +#include <linux/delay.h> +#include <linux/device.h> +#include <linux/interrupt.h> +#include <linux/io.h> +#include <linux/module.h> +#include <linux/platform_device.h> +#include <linux/pm_runtime.h> + +#include <linux/spi/spi.h> + +#define SUN4I_FIFO_DEPTH 64 + +#define SUN4I_RXDATA_REG 0x00 + +#define SUN4I_TXDATA_REG 0x04 + +#define SUN4I_CTL_REG 0x08 +#define SUN4I_CTL_ENABLE BIT(0) +#define SUN4I_CTL_MASTER BIT(1) +#define SUN4I_CTL_CPHA BIT(2) +#define SUN4I_CTL_CPOL BIT(3) +#define SUN4I_CTL_CS_ACTIVE_LOW BIT(4) +#define SUN4I_CTL_LMTF BIT(6) +#define SUN4I_CTL_TF_RST BIT(8) +#define SUN4I_CTL_RF_RST BIT(9) +#define SUN4I_CTL_XCH BIT(10) +#define SUN4I_CTL_CS_MASK 0x3000 +#define SUN4I_CTL_CS(cs) (((cs) << 12) & SUN4I_CTL_CS_MASK) +#define SUN4I_CTL_DHB BIT(15) +#define SUN4I_CTL_CS_MANUAL BIT(16) +#define SUN4I_CTL_CS_LEVEL BIT(17) +#define SUN4I_CTL_TP BIT(18) + +#define SUN4I_INT_CTL_REG 0x0c +#define SUN4I_INT_CTL_RF_F34 BIT(4) +#define SUN4I_INT_CTL_TF_E34 BIT(12) +#define SUN4I_INT_CTL_TC BIT(16) + +#define SUN4I_INT_STA_REG 0x10 + +#define SUN4I_DMA_CTL_REG 0x14 + +#define SUN4I_WAIT_REG 0x18 + +#define SUN4I_CLK_CTL_REG 0x1c +#define SUN4I_CLK_CTL_CDR2_MASK 0xff +#define SUN4I_CLK_CTL_CDR2(div) ((div) & SUN4I_CLK_CTL_CDR2_MASK) +#define SUN4I_CLK_CTL_CDR1_MASK 0xf +#define SUN4I_CLK_CTL_CDR1(div) (((div) & SUN4I_CLK_CTL_CDR1_MASK) << 8) +#define SUN4I_CLK_CTL_DRS BIT(12) + +#define SUN4I_MAX_XFER_SIZE 0xffffff + +#define SUN4I_BURST_CNT_REG 0x20 +#define SUN4I_BURST_CNT(cnt) ((cnt) & SUN4I_MAX_XFER_SIZE) + +#define SUN4I_XMIT_CNT_REG 0x24 +#define SUN4I_XMIT_CNT(cnt) ((cnt) & SUN4I_MAX_XFER_SIZE) + + +#define SUN4I_FIFO_STA_REG 0x28 +#define SUN4I_FIFO_STA_RF_CNT_MASK 0x7f +#define SUN4I_FIFO_STA_RF_CNT_BITS 0 +#define SUN4I_FIFO_STA_TF_CNT_MASK 0x7f +#define SUN4I_FIFO_STA_TF_CNT_BITS 16 + +struct sun4i_spi { + struct spi_master *master; + void __iomem *base_addr; + struct clk *hclk; + struct clk *mclk; + + struct completion done; + + const u8 *tx_buf; + u8 *rx_buf; + int len; +}; + +static inline u32 sun4i_spi_read(struct sun4i_spi *sspi, u32 reg) +{ + return readl(sspi->base_addr + reg); +} + +static inline void sun4i_spi_write(struct sun4i_spi *sspi, u32 reg, u32 value) +{ + writel(value, sspi->base_addr + reg); +} + +static inline u32 sun4i_spi_get_tx_fifo_count(struct sun4i_spi *sspi) +{ + u32 reg = sun4i_spi_read(sspi, SUN4I_FIFO_STA_REG); + + reg >>= SUN4I_FIFO_STA_TF_CNT_BITS; + + return reg & SUN4I_FIFO_STA_TF_CNT_MASK; +} + +static inline void sun4i_spi_enable_interrupt(struct sun4i_spi *sspi, u32 mask) +{ + u32 reg = sun4i_spi_read(sspi, SUN4I_INT_CTL_REG); + + reg |= mask; + sun4i_spi_write(sspi, SUN4I_INT_CTL_REG, reg); +} + +static inline void sun4i_spi_disable_interrupt(struct sun4i_spi *sspi, u32 mask) +{ + u32 reg = sun4i_spi_read(sspi, SUN4I_INT_CTL_REG); + + reg &= ~mask; + sun4i_spi_write(sspi, SUN4I_INT_CTL_REG, reg); +} + +static inline void sun4i_spi_drain_fifo(struct sun4i_spi *sspi, int len) +{ + u32 reg, cnt; + u8 byte; + + /* See how much data is available */ + reg = sun4i_spi_read(sspi, SUN4I_FIFO_STA_REG); + reg &= SUN4I_FIFO_STA_RF_CNT_MASK; + cnt = reg >> SUN4I_FIFO_STA_RF_CNT_BITS; + + if (len > cnt) + len = cnt; + + while (len--) { + byte = readb(sspi->base_addr + SUN4I_RXDATA_REG); + if (sspi->rx_buf) + *sspi->rx_buf++ = byte; + } +} + +static inline void sun4i_spi_fill_fifo(struct sun4i_spi *sspi, int len) +{ + u32 cnt; + u8 byte; + + /* See how much data we can fit */ + cnt = SUN4I_FIFO_DEPTH - sun4i_spi_get_tx_fifo_count(sspi); + + len = min3(len, (int)cnt, sspi->len); + + while (len--) { + byte = sspi->tx_buf ? *sspi->tx_buf++ : 0; + writeb(byte, sspi->base_addr + SUN4I_TXDATA_REG); + sspi->len--; + } +} + +static void sun4i_spi_set_cs(struct spi_device *spi, bool enable) +{ + struct sun4i_spi *sspi = spi_master_get_devdata(spi->master); + u32 reg; + + reg = sun4i_spi_read(sspi, SUN4I_CTL_REG); + + reg &= ~SUN4I_CTL_CS_MASK; + reg |= SUN4I_CTL_CS(spi->chip_select); + + /* We want to control the chip select manually */ + reg |= SUN4I_CTL_CS_MANUAL; + + if (enable) + reg |= SUN4I_CTL_CS_LEVEL; + else + reg &= ~SUN4I_CTL_CS_LEVEL; + + /* + * Even though this looks irrelevant since we are supposed to + * be controlling the chip select manually, this bit also + * controls the levels of the chip select for inactive + * devices. + * + * If we don't set it, the chip select level will go low by + * default when the device is idle, which is not really + * expected in the common case where the chip select is active + * low. + */ + if (spi->mode & SPI_CS_HIGH) + reg &= ~SUN4I_CTL_CS_ACTIVE_LOW; + else + reg |= SUN4I_CTL_CS_ACTIVE_LOW; + + sun4i_spi_write(sspi, SUN4I_CTL_REG, reg); +} + +static size_t sun4i_spi_max_transfer_size(struct spi_device *spi) +{ + return SUN4I_MAX_XFER_SIZE - 1; +} + +static int sun4i_spi_transfer_one(struct spi_master *master, + struct spi_device *spi, + struct spi_transfer *tfr) +{ + struct sun4i_spi *sspi = spi_master_get_devdata(master); + unsigned int mclk_rate, div, timeout; + unsigned int start, end, tx_time; + unsigned int tx_len = 0; + int ret = 0; + u32 reg; + + /* We don't support transfer larger than the FIFO */ + if (tfr->len > SUN4I_MAX_XFER_SIZE) + return -EMSGSIZE; + + if (tfr->tx_buf && tfr->len >= SUN4I_MAX_XFER_SIZE) + return -EMSGSIZE; + + reinit_completion(&sspi->done); + sspi->tx_buf = tfr->tx_buf; + sspi->rx_buf = tfr->rx_buf; + sspi->len = tfr->len; + + /* Clear pending interrupts */ + sun4i_spi_write(sspi, SUN4I_INT_STA_REG, ~0); + + + reg = sun4i_spi_read(sspi, SUN4I_CTL_REG); + + /* Reset FIFOs */ + sun4i_spi_write(sspi, SUN4I_CTL_REG, + reg | SUN4I_CTL_RF_RST | SUN4I_CTL_TF_RST); + + /* + * Setup the transfer control register: Chip Select, + * polarities, etc. + */ + if (spi->mode & SPI_CPOL) + reg |= SUN4I_CTL_CPOL; + else + reg &= ~SUN4I_CTL_CPOL; + + if (spi->mode & SPI_CPHA) + reg |= SUN4I_CTL_CPHA; + else + reg &= ~SUN4I_CTL_CPHA; + + if (spi->mode & SPI_LSB_FIRST) + reg |= SUN4I_CTL_LMTF; + else + reg &= ~SUN4I_CTL_LMTF; + + + /* + * If it's a TX only transfer, we don't want to fill the RX + * FIFO with bogus data + */ + if (sspi->rx_buf) + reg &= ~SUN4I_CTL_DHB; + else + reg |= SUN4I_CTL_DHB; + + sun4i_spi_write(sspi, SUN4I_CTL_REG, reg); + + /* Ensure that we have a parent clock fast enough */ + mclk_rate = clk_get_rate(sspi->mclk); + if (mclk_rate < (2 * tfr->speed_hz)) { + clk_set_rate(sspi->mclk, 2 * tfr->speed_hz); + mclk_rate = clk_get_rate(sspi->mclk); + } + + /* + * Setup clock divider. + * + * We have two choices there. Either we can use the clock + * divide rate 1, which is calculated thanks to this formula: + * SPI_CLK = MOD_CLK / (2 ^ (cdr + 1)) + * Or we can use CDR2, which is calculated with the formula: + * SPI_CLK = MOD_CLK / (2 * (cdr + 1)) + * Wether we use the former or the latter is set through the + * DRS bit. + * + * First try CDR2, and if we can't reach the expected + * frequency, fall back to CDR1. + */ + div = mclk_rate / (2 * tfr->speed_hz); + if (div <= (SUN4I_CLK_CTL_CDR2_MASK + 1)) { + if (div > 0) + div--; + + reg = SUN4I_CLK_CTL_CDR2(div) | SUN4I_CLK_CTL_DRS; + } else { + div = ilog2(mclk_rate) - ilog2(tfr->speed_hz); + reg = SUN4I_CLK_CTL_CDR1(div); + } + + sun4i_spi_write(sspi, SUN4I_CLK_CTL_REG, reg); + + /* Setup the transfer now... */ + if (sspi->tx_buf) + tx_len = tfr->len; + + /* Setup the counters */ + sun4i_spi_write(sspi, SUN4I_BURST_CNT_REG, SUN4I_BURST_CNT(tfr->len)); + sun4i_spi_write(sspi, SUN4I_XMIT_CNT_REG, SUN4I_XMIT_CNT(tx_len)); + + /* + * Fill the TX FIFO + * Filling the FIFO fully causes timeout for some reason + * at least on spi2 on A10s + */ + sun4i_spi_fill_fifo(sspi, SUN4I_FIFO_DEPTH - 1); + + /* Enable the interrupts */ + sun4i_spi_enable_interrupt(sspi, SUN4I_INT_CTL_TC | + SUN4I_INT_CTL_RF_F34); + /* Only enable Tx FIFO interrupt if we really need it */ + if (tx_len > SUN4I_FIFO_DEPTH) + sun4i_spi_enable_interrupt(sspi, SUN4I_INT_CTL_TF_E34); + + /* Start the transfer */ + reg = sun4i_spi_read(sspi, SUN4I_CTL_REG); + sun4i_spi_write(sspi, SUN4I_CTL_REG, reg | SUN4I_CTL_XCH); + + tx_time = max(tfr->len * 8 * 2 / (tfr->speed_hz / 1000), 100U); + start = jiffies; + timeout = wait_for_completion_timeout(&sspi->done, + msecs_to_jiffies(tx_time)); + end = jiffies; + if (!timeout) { + dev_warn(&master->dev, + "%s: timeout transferring %u bytes@%iHz for %i(%i)ms", + dev_name(&spi->dev), tfr->len, tfr->speed_hz, + jiffies_to_msecs(end - start), tx_time); + ret = -ETIMEDOUT; + goto out; + } + + +out: + sun4i_spi_write(sspi, SUN4I_INT_CTL_REG, 0); + + return ret; +} + +static irqreturn_t sun4i_spi_handler(int irq, void *dev_id) +{ + struct sun4i_spi *sspi = dev_id; + u32 status = sun4i_spi_read(sspi, SUN4I_INT_STA_REG); + + /* Transfer complete */ + if (status & SUN4I_INT_CTL_TC) { + sun4i_spi_write(sspi, SUN4I_INT_STA_REG, SUN4I_INT_CTL_TC); + sun4i_spi_drain_fifo(sspi, SUN4I_FIFO_DEPTH); + complete(&sspi->done); + return IRQ_HANDLED; + } + + /* Receive FIFO 3/4 full */ + if (status & SUN4I_INT_CTL_RF_F34) { + sun4i_spi_drain_fifo(sspi, SUN4I_FIFO_DEPTH); + /* Only clear the interrupt _after_ draining the FIFO */ + sun4i_spi_write(sspi, SUN4I_INT_STA_REG, SUN4I_INT_CTL_RF_F34); + return IRQ_HANDLED; + } + + /* Transmit FIFO 3/4 empty */ + if (status & SUN4I_INT_CTL_TF_E34) { + sun4i_spi_fill_fifo(sspi, SUN4I_FIFO_DEPTH); + + if (!sspi->len) + /* nothing left to transmit */ + sun4i_spi_disable_interrupt(sspi, SUN4I_INT_CTL_TF_E34); + + /* Only clear the interrupt _after_ re-seeding the FIFO */ + sun4i_spi_write(sspi, SUN4I_INT_STA_REG, SUN4I_INT_CTL_TF_E34); + + return IRQ_HANDLED; + } + + return IRQ_NONE; +} + +static int sun4i_spi_runtime_resume(struct device *dev) +{ + struct spi_master *master = dev_get_drvdata(dev); + struct sun4i_spi *sspi = spi_master_get_devdata(master); + int ret; + + ret = clk_prepare_enable(sspi->hclk); + if (ret) { + dev_err(dev, "Couldn't enable AHB clock\n"); + goto out; + } + + ret = clk_prepare_enable(sspi->mclk); + if (ret) { + dev_err(dev, "Couldn't enable module clock\n"); + goto err; + } + + sun4i_spi_write(sspi, SUN4I_CTL_REG, + SUN4I_CTL_ENABLE | SUN4I_CTL_MASTER | SUN4I_CTL_TP); + + return 0; + +err: + clk_disable_unprepare(sspi->hclk); +out: + return ret; +} + +static int sun4i_spi_runtime_suspend(struct device *dev) +{ + struct spi_master *master = dev_get_drvdata(dev); + struct sun4i_spi *sspi = spi_master_get_devdata(master); + + clk_disable_unprepare(sspi->mclk); + clk_disable_unprepare(sspi->hclk); + + return 0; +} + +static int sun4i_spi_probe(struct platform_device *pdev) +{ + struct spi_master *master; + struct sun4i_spi *sspi; + int ret = 0, irq; + + master = spi_alloc_master(&pdev->dev, sizeof(struct sun4i_spi)); + if (!master) { + dev_err(&pdev->dev, "Unable to allocate SPI Master\n"); + return -ENOMEM; + } + + platform_set_drvdata(pdev, master); + sspi = spi_master_get_devdata(master); + + sspi->base_addr = devm_platform_ioremap_resource(pdev, 0); + if (IS_ERR(sspi->base_addr)) { + ret = PTR_ERR(sspi->base_addr); + goto err_free_master; + } + + irq = platform_get_irq(pdev, 0); + if (irq < 0) { + ret = -ENXIO; + goto err_free_master; + } + + ret = devm_request_irq(&pdev->dev, irq, sun4i_spi_handler, + 0, "sun4i-spi", sspi); + if (ret) { + dev_err(&pdev->dev, "Cannot request IRQ\n"); + goto err_free_master; + } + + sspi->master = master; + master->max_speed_hz = 100 * 1000 * 1000; + master->min_speed_hz = 3 * 1000; + master->set_cs = sun4i_spi_set_cs; + master->transfer_one = sun4i_spi_transfer_one; + master->num_chipselect = 4; + master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH | SPI_LSB_FIRST; + master->bits_per_word_mask = SPI_BPW_MASK(8); + master->dev.of_node = pdev->dev.of_node; + master->auto_runtime_pm = true; + master->max_transfer_size = sun4i_spi_max_transfer_size; + + sspi->hclk = devm_clk_get(&pdev->dev, "ahb"); + if (IS_ERR(sspi->hclk)) { + dev_err(&pdev->dev, "Unable to acquire AHB clock\n"); + ret = PTR_ERR(sspi->hclk); + goto err_free_master; + } + + sspi->mclk = devm_clk_get(&pdev->dev, "mod"); + if (IS_ERR(sspi->mclk)) { + dev_err(&pdev->dev, "Unable to acquire module clock\n"); + ret = PTR_ERR(sspi->mclk); + goto err_free_master; + } + + init_completion(&sspi->done); + + /* + * This wake-up/shutdown pattern is to be able to have the + * device woken up, even if runtime_pm is disabled + */ + ret = sun4i_spi_runtime_resume(&pdev->dev); + if (ret) { + dev_err(&pdev->dev, "Couldn't resume the device\n"); + goto err_free_master; + } + + pm_runtime_set_active(&pdev->dev); + pm_runtime_enable(&pdev->dev); + pm_runtime_idle(&pdev->dev); + + ret = devm_spi_register_master(&pdev->dev, master); + if (ret) { + dev_err(&pdev->dev, "cannot register SPI master\n"); + goto err_pm_disable; + } + + return 0; + +err_pm_disable: + pm_runtime_disable(&pdev->dev); + sun4i_spi_runtime_suspend(&pdev->dev); +err_free_master: + spi_master_put(master); + return ret; +} + +static int sun4i_spi_remove(struct platform_device *pdev) +{ + pm_runtime_force_suspend(&pdev->dev); + + return 0; +} + +static const struct of_device_id sun4i_spi_match[] = { + { .compatible = "allwinner,sun4i-a10-spi", }, + {} +}; +MODULE_DEVICE_TABLE(of, sun4i_spi_match); + +static const struct dev_pm_ops sun4i_spi_pm_ops = { + .runtime_resume = sun4i_spi_runtime_resume, + .runtime_suspend = sun4i_spi_runtime_suspend, +}; + +static struct platform_driver sun4i_spi_driver = { + .probe = sun4i_spi_probe, + .remove = sun4i_spi_remove, + .driver = { + .name = "sun4i-spi", + .of_match_table = sun4i_spi_match, + .pm = &sun4i_spi_pm_ops, + }, +}; +module_platform_driver(sun4i_spi_driver); + +MODULE_AUTHOR("Pan Nan <pannan@allwinnertech.com>"); +MODULE_AUTHOR("Maxime Ripard <maxime.ripard@free-electrons.com>"); +MODULE_DESCRIPTION("Allwinner A1X/A20 SPI controller driver"); +MODULE_LICENSE("GPL"); diff --git a/drivers/spi/spi-sun6i.c b/drivers/spi/spi-sun6i.c new file mode 100644 index 000000000..803d92f8d --- /dev/null +++ b/drivers/spi/spi-sun6i.c @@ -0,0 +1,564 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Copyright (C) 2012 - 2014 Allwinner Tech + * Pan Nan <pannan@allwinnertech.com> + * + * Copyright (C) 2014 Maxime Ripard + * Maxime Ripard <maxime.ripard@free-electrons.com> + */ + +#include <linux/bitfield.h> +#include <linux/clk.h> +#include <linux/delay.h> +#include <linux/device.h> +#include <linux/interrupt.h> +#include <linux/io.h> +#include <linux/module.h> +#include <linux/of_device.h> +#include <linux/platform_device.h> +#include <linux/pm_runtime.h> +#include <linux/reset.h> + +#include <linux/spi/spi.h> + +#define SUN6I_FIFO_DEPTH 128 +#define SUN8I_FIFO_DEPTH 64 + +#define SUN6I_GBL_CTL_REG 0x04 +#define SUN6I_GBL_CTL_BUS_ENABLE BIT(0) +#define SUN6I_GBL_CTL_MASTER BIT(1) +#define SUN6I_GBL_CTL_TP BIT(7) +#define SUN6I_GBL_CTL_RST BIT(31) + +#define SUN6I_TFR_CTL_REG 0x08 +#define SUN6I_TFR_CTL_CPHA BIT(0) +#define SUN6I_TFR_CTL_CPOL BIT(1) +#define SUN6I_TFR_CTL_SPOL BIT(2) +#define SUN6I_TFR_CTL_CS_MASK 0x30 +#define SUN6I_TFR_CTL_CS(cs) (((cs) << 4) & SUN6I_TFR_CTL_CS_MASK) +#define SUN6I_TFR_CTL_CS_MANUAL BIT(6) +#define SUN6I_TFR_CTL_CS_LEVEL BIT(7) +#define SUN6I_TFR_CTL_DHB BIT(8) +#define SUN6I_TFR_CTL_FBS BIT(12) +#define SUN6I_TFR_CTL_XCH BIT(31) + +#define SUN6I_INT_CTL_REG 0x10 +#define SUN6I_INT_CTL_RF_RDY BIT(0) +#define SUN6I_INT_CTL_TF_ERQ BIT(4) +#define SUN6I_INT_CTL_RF_OVF BIT(8) +#define SUN6I_INT_CTL_TC BIT(12) + +#define SUN6I_INT_STA_REG 0x14 + +#define SUN6I_FIFO_CTL_REG 0x18 +#define SUN6I_FIFO_CTL_RF_RDY_TRIG_LEVEL_MASK 0xff +#define SUN6I_FIFO_CTL_RF_RDY_TRIG_LEVEL_BITS 0 +#define SUN6I_FIFO_CTL_RF_RST BIT(15) +#define SUN6I_FIFO_CTL_TF_ERQ_TRIG_LEVEL_MASK 0xff +#define SUN6I_FIFO_CTL_TF_ERQ_TRIG_LEVEL_BITS 16 +#define SUN6I_FIFO_CTL_TF_RST BIT(31) + +#define SUN6I_FIFO_STA_REG 0x1c +#define SUN6I_FIFO_STA_RF_CNT_MASK GENMASK(7, 0) +#define SUN6I_FIFO_STA_TF_CNT_MASK GENMASK(23, 16) + +#define SUN6I_CLK_CTL_REG 0x24 +#define SUN6I_CLK_CTL_CDR2_MASK 0xff +#define SUN6I_CLK_CTL_CDR2(div) (((div) & SUN6I_CLK_CTL_CDR2_MASK) << 0) +#define SUN6I_CLK_CTL_CDR1_MASK 0xf +#define SUN6I_CLK_CTL_CDR1(div) (((div) & SUN6I_CLK_CTL_CDR1_MASK) << 8) +#define SUN6I_CLK_CTL_DRS BIT(12) + +#define SUN6I_MAX_XFER_SIZE 0xffffff + +#define SUN6I_BURST_CNT_REG 0x30 + +#define SUN6I_XMIT_CNT_REG 0x34 + +#define SUN6I_BURST_CTL_CNT_REG 0x38 + +#define SUN6I_TXDATA_REG 0x200 +#define SUN6I_RXDATA_REG 0x300 + +struct sun6i_spi { + struct spi_master *master; + void __iomem *base_addr; + struct clk *hclk; + struct clk *mclk; + struct reset_control *rstc; + + struct completion done; + + const u8 *tx_buf; + u8 *rx_buf; + int len; + unsigned long fifo_depth; +}; + +static inline u32 sun6i_spi_read(struct sun6i_spi *sspi, u32 reg) +{ + return readl(sspi->base_addr + reg); +} + +static inline void sun6i_spi_write(struct sun6i_spi *sspi, u32 reg, u32 value) +{ + writel(value, sspi->base_addr + reg); +} + +static inline u32 sun6i_spi_get_rx_fifo_count(struct sun6i_spi *sspi) +{ + u32 reg = sun6i_spi_read(sspi, SUN6I_FIFO_STA_REG); + + return FIELD_GET(SUN6I_FIFO_STA_RF_CNT_MASK, reg); +} + +static inline u32 sun6i_spi_get_tx_fifo_count(struct sun6i_spi *sspi) +{ + u32 reg = sun6i_spi_read(sspi, SUN6I_FIFO_STA_REG); + + return FIELD_GET(SUN6I_FIFO_STA_TF_CNT_MASK, reg); +} + +static inline void sun6i_spi_disable_interrupt(struct sun6i_spi *sspi, u32 mask) +{ + u32 reg = sun6i_spi_read(sspi, SUN6I_INT_CTL_REG); + + reg &= ~mask; + sun6i_spi_write(sspi, SUN6I_INT_CTL_REG, reg); +} + +static inline void sun6i_spi_drain_fifo(struct sun6i_spi *sspi) +{ + u32 len; + u8 byte; + + /* See how much data is available */ + len = sun6i_spi_get_rx_fifo_count(sspi); + + while (len--) { + byte = readb(sspi->base_addr + SUN6I_RXDATA_REG); + if (sspi->rx_buf) + *sspi->rx_buf++ = byte; + } +} + +static inline void sun6i_spi_fill_fifo(struct sun6i_spi *sspi) +{ + u32 cnt; + int len; + u8 byte; + + /* See how much data we can fit */ + cnt = sspi->fifo_depth - sun6i_spi_get_tx_fifo_count(sspi); + + len = min((int)cnt, sspi->len); + + while (len--) { + byte = sspi->tx_buf ? *sspi->tx_buf++ : 0; + writeb(byte, sspi->base_addr + SUN6I_TXDATA_REG); + sspi->len--; + } +} + +static void sun6i_spi_set_cs(struct spi_device *spi, bool enable) +{ + struct sun6i_spi *sspi = spi_master_get_devdata(spi->master); + u32 reg; + + reg = sun6i_spi_read(sspi, SUN6I_TFR_CTL_REG); + reg &= ~SUN6I_TFR_CTL_CS_MASK; + reg |= SUN6I_TFR_CTL_CS(spi->chip_select); + + if (enable) + reg |= SUN6I_TFR_CTL_CS_LEVEL; + else + reg &= ~SUN6I_TFR_CTL_CS_LEVEL; + + sun6i_spi_write(sspi, SUN6I_TFR_CTL_REG, reg); +} + +static size_t sun6i_spi_max_transfer_size(struct spi_device *spi) +{ + return SUN6I_MAX_XFER_SIZE - 1; +} + +static int sun6i_spi_transfer_one(struct spi_master *master, + struct spi_device *spi, + struct spi_transfer *tfr) +{ + struct sun6i_spi *sspi = spi_master_get_devdata(master); + unsigned int mclk_rate, div, div_cdr1, div_cdr2, timeout; + unsigned int start, end, tx_time; + unsigned int trig_level; + unsigned int tx_len = 0, rx_len = 0; + int ret = 0; + u32 reg; + + if (tfr->len > SUN6I_MAX_XFER_SIZE) + return -EINVAL; + + reinit_completion(&sspi->done); + sspi->tx_buf = tfr->tx_buf; + sspi->rx_buf = tfr->rx_buf; + sspi->len = tfr->len; + + /* Clear pending interrupts */ + sun6i_spi_write(sspi, SUN6I_INT_STA_REG, ~0); + + /* Reset FIFO */ + sun6i_spi_write(sspi, SUN6I_FIFO_CTL_REG, + SUN6I_FIFO_CTL_RF_RST | SUN6I_FIFO_CTL_TF_RST); + + /* + * Setup FIFO interrupt trigger level + * Here we choose 3/4 of the full fifo depth, as it's the hardcoded + * value used in old generation of Allwinner SPI controller. + * (See spi-sun4i.c) + */ + trig_level = sspi->fifo_depth / 4 * 3; + sun6i_spi_write(sspi, SUN6I_FIFO_CTL_REG, + (trig_level << SUN6I_FIFO_CTL_RF_RDY_TRIG_LEVEL_BITS) | + (trig_level << SUN6I_FIFO_CTL_TF_ERQ_TRIG_LEVEL_BITS)); + + /* + * Setup the transfer control register: Chip Select, + * polarities, etc. + */ + reg = sun6i_spi_read(sspi, SUN6I_TFR_CTL_REG); + + if (spi->mode & SPI_CPOL) + reg |= SUN6I_TFR_CTL_CPOL; + else + reg &= ~SUN6I_TFR_CTL_CPOL; + + if (spi->mode & SPI_CPHA) + reg |= SUN6I_TFR_CTL_CPHA; + else + reg &= ~SUN6I_TFR_CTL_CPHA; + + if (spi->mode & SPI_LSB_FIRST) + reg |= SUN6I_TFR_CTL_FBS; + else + reg &= ~SUN6I_TFR_CTL_FBS; + + /* + * If it's a TX only transfer, we don't want to fill the RX + * FIFO with bogus data + */ + if (sspi->rx_buf) { + reg &= ~SUN6I_TFR_CTL_DHB; + rx_len = tfr->len; + } else { + reg |= SUN6I_TFR_CTL_DHB; + } + + /* We want to control the chip select manually */ + reg |= SUN6I_TFR_CTL_CS_MANUAL; + + sun6i_spi_write(sspi, SUN6I_TFR_CTL_REG, reg); + + /* Ensure that we have a parent clock fast enough */ + mclk_rate = clk_get_rate(sspi->mclk); + if (mclk_rate < (2 * tfr->speed_hz)) { + clk_set_rate(sspi->mclk, 2 * tfr->speed_hz); + mclk_rate = clk_get_rate(sspi->mclk); + } + + /* + * Setup clock divider. + * + * We have two choices there. Either we can use the clock + * divide rate 1, which is calculated thanks to this formula: + * SPI_CLK = MOD_CLK / (2 ^ cdr) + * Or we can use CDR2, which is calculated with the formula: + * SPI_CLK = MOD_CLK / (2 * (cdr + 1)) + * Wether we use the former or the latter is set through the + * DRS bit. + * + * First try CDR2, and if we can't reach the expected + * frequency, fall back to CDR1. + */ + div_cdr1 = DIV_ROUND_UP(mclk_rate, tfr->speed_hz); + div_cdr2 = DIV_ROUND_UP(div_cdr1, 2); + if (div_cdr2 <= (SUN6I_CLK_CTL_CDR2_MASK + 1)) { + reg = SUN6I_CLK_CTL_CDR2(div_cdr2 - 1) | SUN6I_CLK_CTL_DRS; + tfr->effective_speed_hz = mclk_rate / (2 * div_cdr2); + } else { + div = min(SUN6I_CLK_CTL_CDR1_MASK, order_base_2(div_cdr1)); + reg = SUN6I_CLK_CTL_CDR1(div); + tfr->effective_speed_hz = mclk_rate / (1 << div); + } + + sun6i_spi_write(sspi, SUN6I_CLK_CTL_REG, reg); + /* Finally enable the bus - doing so before might raise SCK to HIGH */ + reg = sun6i_spi_read(sspi, SUN6I_GBL_CTL_REG); + reg |= SUN6I_GBL_CTL_BUS_ENABLE; + sun6i_spi_write(sspi, SUN6I_GBL_CTL_REG, reg); + + /* Setup the transfer now... */ + if (sspi->tx_buf) + tx_len = tfr->len; + + /* Setup the counters */ + sun6i_spi_write(sspi, SUN6I_BURST_CNT_REG, tfr->len); + sun6i_spi_write(sspi, SUN6I_XMIT_CNT_REG, tx_len); + sun6i_spi_write(sspi, SUN6I_BURST_CTL_CNT_REG, tx_len); + + /* Fill the TX FIFO */ + sun6i_spi_fill_fifo(sspi); + + /* Enable the interrupts */ + reg = SUN6I_INT_CTL_TC; + + if (rx_len > sspi->fifo_depth) + reg |= SUN6I_INT_CTL_RF_RDY; + if (tx_len > sspi->fifo_depth) + reg |= SUN6I_INT_CTL_TF_ERQ; + + sun6i_spi_write(sspi, SUN6I_INT_CTL_REG, reg); + + /* Start the transfer */ + reg = sun6i_spi_read(sspi, SUN6I_TFR_CTL_REG); + sun6i_spi_write(sspi, SUN6I_TFR_CTL_REG, reg | SUN6I_TFR_CTL_XCH); + + tx_time = max(tfr->len * 8 * 2 / (tfr->speed_hz / 1000), 100U); + start = jiffies; + timeout = wait_for_completion_timeout(&sspi->done, + msecs_to_jiffies(tx_time)); + end = jiffies; + if (!timeout) { + dev_warn(&master->dev, + "%s: timeout transferring %u bytes@%iHz for %i(%i)ms", + dev_name(&spi->dev), tfr->len, tfr->speed_hz, + jiffies_to_msecs(end - start), tx_time); + ret = -ETIMEDOUT; + } + + sun6i_spi_write(sspi, SUN6I_INT_CTL_REG, 0); + + return ret; +} + +static irqreturn_t sun6i_spi_handler(int irq, void *dev_id) +{ + struct sun6i_spi *sspi = dev_id; + u32 status = sun6i_spi_read(sspi, SUN6I_INT_STA_REG); + + /* Transfer complete */ + if (status & SUN6I_INT_CTL_TC) { + sun6i_spi_write(sspi, SUN6I_INT_STA_REG, SUN6I_INT_CTL_TC); + sun6i_spi_drain_fifo(sspi); + complete(&sspi->done); + return IRQ_HANDLED; + } + + /* Receive FIFO 3/4 full */ + if (status & SUN6I_INT_CTL_RF_RDY) { + sun6i_spi_drain_fifo(sspi); + /* Only clear the interrupt _after_ draining the FIFO */ + sun6i_spi_write(sspi, SUN6I_INT_STA_REG, SUN6I_INT_CTL_RF_RDY); + return IRQ_HANDLED; + } + + /* Transmit FIFO 3/4 empty */ + if (status & SUN6I_INT_CTL_TF_ERQ) { + sun6i_spi_fill_fifo(sspi); + + if (!sspi->len) + /* nothing left to transmit */ + sun6i_spi_disable_interrupt(sspi, SUN6I_INT_CTL_TF_ERQ); + + /* Only clear the interrupt _after_ re-seeding the FIFO */ + sun6i_spi_write(sspi, SUN6I_INT_STA_REG, SUN6I_INT_CTL_TF_ERQ); + + return IRQ_HANDLED; + } + + return IRQ_NONE; +} + +static int sun6i_spi_runtime_resume(struct device *dev) +{ + struct spi_master *master = dev_get_drvdata(dev); + struct sun6i_spi *sspi = spi_master_get_devdata(master); + int ret; + + ret = clk_prepare_enable(sspi->hclk); + if (ret) { + dev_err(dev, "Couldn't enable AHB clock\n"); + goto out; + } + + ret = clk_prepare_enable(sspi->mclk); + if (ret) { + dev_err(dev, "Couldn't enable module clock\n"); + goto err; + } + + ret = reset_control_deassert(sspi->rstc); + if (ret) { + dev_err(dev, "Couldn't deassert the device from reset\n"); + goto err2; + } + + sun6i_spi_write(sspi, SUN6I_GBL_CTL_REG, + SUN6I_GBL_CTL_MASTER | SUN6I_GBL_CTL_TP); + + return 0; + +err2: + clk_disable_unprepare(sspi->mclk); +err: + clk_disable_unprepare(sspi->hclk); +out: + return ret; +} + +static int sun6i_spi_runtime_suspend(struct device *dev) +{ + struct spi_master *master = dev_get_drvdata(dev); + struct sun6i_spi *sspi = spi_master_get_devdata(master); + + reset_control_assert(sspi->rstc); + clk_disable_unprepare(sspi->mclk); + clk_disable_unprepare(sspi->hclk); + + return 0; +} + +static int sun6i_spi_probe(struct platform_device *pdev) +{ + struct spi_master *master; + struct sun6i_spi *sspi; + int ret = 0, irq; + + master = spi_alloc_master(&pdev->dev, sizeof(struct sun6i_spi)); + if (!master) { + dev_err(&pdev->dev, "Unable to allocate SPI Master\n"); + return -ENOMEM; + } + + platform_set_drvdata(pdev, master); + sspi = spi_master_get_devdata(master); + + sspi->base_addr = devm_platform_ioremap_resource(pdev, 0); + if (IS_ERR(sspi->base_addr)) { + ret = PTR_ERR(sspi->base_addr); + goto err_free_master; + } + + irq = platform_get_irq(pdev, 0); + if (irq < 0) { + ret = -ENXIO; + goto err_free_master; + } + + ret = devm_request_irq(&pdev->dev, irq, sun6i_spi_handler, + 0, "sun6i-spi", sspi); + if (ret) { + dev_err(&pdev->dev, "Cannot request IRQ\n"); + goto err_free_master; + } + + sspi->master = master; + sspi->fifo_depth = (unsigned long)of_device_get_match_data(&pdev->dev); + + master->max_speed_hz = 100 * 1000 * 1000; + master->min_speed_hz = 3 * 1000; + master->use_gpio_descriptors = true; + master->set_cs = sun6i_spi_set_cs; + master->transfer_one = sun6i_spi_transfer_one; + master->num_chipselect = 4; + master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH | SPI_LSB_FIRST; + master->bits_per_word_mask = SPI_BPW_MASK(8); + master->dev.of_node = pdev->dev.of_node; + master->auto_runtime_pm = true; + master->max_transfer_size = sun6i_spi_max_transfer_size; + + sspi->hclk = devm_clk_get(&pdev->dev, "ahb"); + if (IS_ERR(sspi->hclk)) { + dev_err(&pdev->dev, "Unable to acquire AHB clock\n"); + ret = PTR_ERR(sspi->hclk); + goto err_free_master; + } + + sspi->mclk = devm_clk_get(&pdev->dev, "mod"); + if (IS_ERR(sspi->mclk)) { + dev_err(&pdev->dev, "Unable to acquire module clock\n"); + ret = PTR_ERR(sspi->mclk); + goto err_free_master; + } + + init_completion(&sspi->done); + + sspi->rstc = devm_reset_control_get_exclusive(&pdev->dev, NULL); + if (IS_ERR(sspi->rstc)) { + dev_err(&pdev->dev, "Couldn't get reset controller\n"); + ret = PTR_ERR(sspi->rstc); + goto err_free_master; + } + + /* + * This wake-up/shutdown pattern is to be able to have the + * device woken up, even if runtime_pm is disabled + */ + ret = sun6i_spi_runtime_resume(&pdev->dev); + if (ret) { + dev_err(&pdev->dev, "Couldn't resume the device\n"); + goto err_free_master; + } + + pm_runtime_set_active(&pdev->dev); + pm_runtime_enable(&pdev->dev); + pm_runtime_idle(&pdev->dev); + + ret = devm_spi_register_master(&pdev->dev, master); + if (ret) { + dev_err(&pdev->dev, "cannot register SPI master\n"); + goto err_pm_disable; + } + + return 0; + +err_pm_disable: + pm_runtime_disable(&pdev->dev); + sun6i_spi_runtime_suspend(&pdev->dev); +err_free_master: + spi_master_put(master); + return ret; +} + +static int sun6i_spi_remove(struct platform_device *pdev) +{ + pm_runtime_force_suspend(&pdev->dev); + + return 0; +} + +static const struct of_device_id sun6i_spi_match[] = { + { .compatible = "allwinner,sun6i-a31-spi", .data = (void *)SUN6I_FIFO_DEPTH }, + { .compatible = "allwinner,sun8i-h3-spi", .data = (void *)SUN8I_FIFO_DEPTH }, + {} +}; +MODULE_DEVICE_TABLE(of, sun6i_spi_match); + +static const struct dev_pm_ops sun6i_spi_pm_ops = { + .runtime_resume = sun6i_spi_runtime_resume, + .runtime_suspend = sun6i_spi_runtime_suspend, +}; + +static struct platform_driver sun6i_spi_driver = { + .probe = sun6i_spi_probe, + .remove = sun6i_spi_remove, + .driver = { + .name = "sun6i-spi", + .of_match_table = sun6i_spi_match, + .pm = &sun6i_spi_pm_ops, + }, +}; +module_platform_driver(sun6i_spi_driver); + +MODULE_AUTHOR("Pan Nan <pannan@allwinnertech.com>"); +MODULE_AUTHOR("Maxime Ripard <maxime.ripard@free-electrons.com>"); +MODULE_DESCRIPTION("Allwinner A31 SPI controller driver"); +MODULE_LICENSE("GPL"); diff --git a/drivers/spi/spi-synquacer.c b/drivers/spi/spi-synquacer.c new file mode 100644 index 000000000..dc188f920 --- /dev/null +++ b/drivers/spi/spi-synquacer.c @@ -0,0 +1,830 @@ +// SPDX-License-Identifier: GPL-2.0 +// +// Synquacer HSSPI controller driver +// +// Copyright (c) 2015-2018 Socionext Inc. +// Copyright (c) 2018-2019 Linaro Ltd. +// + +#include <linux/acpi.h> +#include <linux/delay.h> +#include <linux/interrupt.h> +#include <linux/io.h> +#include <linux/module.h> +#include <linux/of.h> +#include <linux/platform_device.h> +#include <linux/pm_runtime.h> +#include <linux/scatterlist.h> +#include <linux/slab.h> +#include <linux/spi/spi.h> +#include <linux/spinlock.h> +#include <linux/clk.h> + +/* HSSPI register address definitions */ +#define SYNQUACER_HSSPI_REG_MCTRL 0x00 +#define SYNQUACER_HSSPI_REG_PCC0 0x04 +#define SYNQUACER_HSSPI_REG_PCC(n) (SYNQUACER_HSSPI_REG_PCC0 + (n) * 4) +#define SYNQUACER_HSSPI_REG_TXF 0x14 +#define SYNQUACER_HSSPI_REG_TXE 0x18 +#define SYNQUACER_HSSPI_REG_TXC 0x1C +#define SYNQUACER_HSSPI_REG_RXF 0x20 +#define SYNQUACER_HSSPI_REG_RXE 0x24 +#define SYNQUACER_HSSPI_REG_RXC 0x28 +#define SYNQUACER_HSSPI_REG_FAULTF 0x2C +#define SYNQUACER_HSSPI_REG_FAULTC 0x30 +#define SYNQUACER_HSSPI_REG_DMCFG 0x34 +#define SYNQUACER_HSSPI_REG_DMSTART 0x38 +#define SYNQUACER_HSSPI_REG_DMBCC 0x3C +#define SYNQUACER_HSSPI_REG_DMSTATUS 0x40 +#define SYNQUACER_HSSPI_REG_FIFOCFG 0x4C +#define SYNQUACER_HSSPI_REG_TX_FIFO 0x50 +#define SYNQUACER_HSSPI_REG_RX_FIFO 0x90 +#define SYNQUACER_HSSPI_REG_MID 0xFC + +/* HSSPI register bit definitions */ +#define SYNQUACER_HSSPI_MCTRL_MEN BIT(0) +#define SYNQUACER_HSSPI_MCTRL_COMMAND_SEQUENCE_EN BIT(1) +#define SYNQUACER_HSSPI_MCTRL_CDSS BIT(3) +#define SYNQUACER_HSSPI_MCTRL_MES BIT(4) +#define SYNQUACER_HSSPI_MCTRL_SYNCON BIT(5) + +#define SYNQUACER_HSSPI_PCC_CPHA BIT(0) +#define SYNQUACER_HSSPI_PCC_CPOL BIT(1) +#define SYNQUACER_HSSPI_PCC_ACES BIT(2) +#define SYNQUACER_HSSPI_PCC_RTM BIT(3) +#define SYNQUACER_HSSPI_PCC_SSPOL BIT(4) +#define SYNQUACER_HSSPI_PCC_SDIR BIT(7) +#define SYNQUACER_HSSPI_PCC_SENDIAN BIT(8) +#define SYNQUACER_HSSPI_PCC_SAFESYNC BIT(16) +#define SYNQUACER_HSSPI_PCC_SS2CD_SHIFT 5U +#define SYNQUACER_HSSPI_PCC_CDRS_MASK 0x7f +#define SYNQUACER_HSSPI_PCC_CDRS_SHIFT 9U + +#define SYNQUACER_HSSPI_TXF_FIFO_FULL BIT(0) +#define SYNQUACER_HSSPI_TXF_FIFO_EMPTY BIT(1) +#define SYNQUACER_HSSPI_TXF_SLAVE_RELEASED BIT(6) + +#define SYNQUACER_HSSPI_TXE_FIFO_FULL BIT(0) +#define SYNQUACER_HSSPI_TXE_FIFO_EMPTY BIT(1) +#define SYNQUACER_HSSPI_TXE_SLAVE_RELEASED BIT(6) + +#define SYNQUACER_HSSPI_RXF_FIFO_MORE_THAN_THRESHOLD BIT(5) +#define SYNQUACER_HSSPI_RXF_SLAVE_RELEASED BIT(6) + +#define SYNQUACER_HSSPI_RXE_FIFO_MORE_THAN_THRESHOLD BIT(5) +#define SYNQUACER_HSSPI_RXE_SLAVE_RELEASED BIT(6) + +#define SYNQUACER_HSSPI_DMCFG_SSDC BIT(1) +#define SYNQUACER_HSSPI_DMCFG_MSTARTEN BIT(2) + +#define SYNQUACER_HSSPI_DMSTART_START BIT(0) +#define SYNQUACER_HSSPI_DMSTOP_STOP BIT(8) +#define SYNQUACER_HSSPI_DMPSEL_CS_MASK 0x3 +#define SYNQUACER_HSSPI_DMPSEL_CS_SHIFT 16U +#define SYNQUACER_HSSPI_DMTRP_BUS_WIDTH_SHIFT 24U +#define SYNQUACER_HSSPI_DMTRP_DATA_MASK 0x3 +#define SYNQUACER_HSSPI_DMTRP_DATA_SHIFT 26U +#define SYNQUACER_HSSPI_DMTRP_DATA_TXRX 0 +#define SYNQUACER_HSSPI_DMTRP_DATA_RX 1 +#define SYNQUACER_HSSPI_DMTRP_DATA_TX 2 + +#define SYNQUACER_HSSPI_DMSTATUS_RX_DATA_MASK 0x1f +#define SYNQUACER_HSSPI_DMSTATUS_RX_DATA_SHIFT 8U +#define SYNQUACER_HSSPI_DMSTATUS_TX_DATA_MASK 0x1f +#define SYNQUACER_HSSPI_DMSTATUS_TX_DATA_SHIFT 16U + +#define SYNQUACER_HSSPI_FIFOCFG_RX_THRESHOLD_MASK 0xf +#define SYNQUACER_HSSPI_FIFOCFG_RX_THRESHOLD_SHIFT 0U +#define SYNQUACER_HSSPI_FIFOCFG_TX_THRESHOLD_MASK 0xf +#define SYNQUACER_HSSPI_FIFOCFG_TX_THRESHOLD_SHIFT 4U +#define SYNQUACER_HSSPI_FIFOCFG_FIFO_WIDTH_MASK 0x3 +#define SYNQUACER_HSSPI_FIFOCFG_FIFO_WIDTH_SHIFT 8U +#define SYNQUACER_HSSPI_FIFOCFG_RX_FLUSH BIT(11) +#define SYNQUACER_HSSPI_FIFOCFG_TX_FLUSH BIT(12) + +#define SYNQUACER_HSSPI_FIFO_DEPTH 16U +#define SYNQUACER_HSSPI_FIFO_TX_THRESHOLD 4U +#define SYNQUACER_HSSPI_FIFO_RX_THRESHOLD \ + (SYNQUACER_HSSPI_FIFO_DEPTH - SYNQUACER_HSSPI_FIFO_TX_THRESHOLD) + +#define SYNQUACER_HSSPI_TRANSFER_MODE_TX BIT(1) +#define SYNQUACER_HSSPI_TRANSFER_MODE_RX BIT(2) +#define SYNQUACER_HSSPI_TRANSFER_TMOUT_MSEC 2000U +#define SYNQUACER_HSSPI_ENABLE_TMOUT_MSEC 1000U + +#define SYNQUACER_HSSPI_CLOCK_SRC_IHCLK 0 +#define SYNQUACER_HSSPI_CLOCK_SRC_IPCLK 1 + +#define SYNQUACER_HSSPI_NUM_CHIP_SELECT 4U +#define SYNQUACER_HSSPI_IRQ_NAME_MAX 32U + +struct synquacer_spi { + struct device *dev; + struct completion transfer_done; + unsigned int cs; + unsigned int bpw; + unsigned int mode; + unsigned int speed; + bool aces, rtm; + void *rx_buf; + const void *tx_buf; + struct clk *clk; + int clk_src_type; + void __iomem *regs; + u32 tx_words, rx_words; + unsigned int bus_width; + unsigned int transfer_mode; + char rx_irq_name[SYNQUACER_HSSPI_IRQ_NAME_MAX]; + char tx_irq_name[SYNQUACER_HSSPI_IRQ_NAME_MAX]; +}; + +static int read_fifo(struct synquacer_spi *sspi) +{ + u32 len = readl(sspi->regs + SYNQUACER_HSSPI_REG_DMSTATUS); + + len = (len >> SYNQUACER_HSSPI_DMSTATUS_RX_DATA_SHIFT) & + SYNQUACER_HSSPI_DMSTATUS_RX_DATA_MASK; + len = min(len, sspi->rx_words); + + switch (sspi->bpw) { + case 8: { + u8 *buf = sspi->rx_buf; + + ioread8_rep(sspi->regs + SYNQUACER_HSSPI_REG_RX_FIFO, + buf, len); + sspi->rx_buf = buf + len; + break; + } + case 16: { + u16 *buf = sspi->rx_buf; + + ioread16_rep(sspi->regs + SYNQUACER_HSSPI_REG_RX_FIFO, + buf, len); + sspi->rx_buf = buf + len; + break; + } + case 24: + /* fallthrough, should use 32-bits access */ + case 32: { + u32 *buf = sspi->rx_buf; + + ioread32_rep(sspi->regs + SYNQUACER_HSSPI_REG_RX_FIFO, + buf, len); + sspi->rx_buf = buf + len; + break; + } + default: + return -EINVAL; + } + + sspi->rx_words -= len; + return 0; +} + +static int write_fifo(struct synquacer_spi *sspi) +{ + u32 len = readl(sspi->regs + SYNQUACER_HSSPI_REG_DMSTATUS); + + len = (len >> SYNQUACER_HSSPI_DMSTATUS_TX_DATA_SHIFT) & + SYNQUACER_HSSPI_DMSTATUS_TX_DATA_MASK; + len = min(SYNQUACER_HSSPI_FIFO_DEPTH - len, + sspi->tx_words); + + switch (sspi->bpw) { + case 8: { + const u8 *buf = sspi->tx_buf; + + iowrite8_rep(sspi->regs + SYNQUACER_HSSPI_REG_TX_FIFO, + buf, len); + sspi->tx_buf = buf + len; + break; + } + case 16: { + const u16 *buf = sspi->tx_buf; + + iowrite16_rep(sspi->regs + SYNQUACER_HSSPI_REG_TX_FIFO, + buf, len); + sspi->tx_buf = buf + len; + break; + } + case 24: + /* fallthrough, should use 32-bits access */ + case 32: { + const u32 *buf = sspi->tx_buf; + + iowrite32_rep(sspi->regs + SYNQUACER_HSSPI_REG_TX_FIFO, + buf, len); + sspi->tx_buf = buf + len; + break; + } + default: + return -EINVAL; + } + + sspi->tx_words -= len; + return 0; +} + +static int synquacer_spi_config(struct spi_master *master, + struct spi_device *spi, + struct spi_transfer *xfer) +{ + struct synquacer_spi *sspi = spi_master_get_devdata(master); + unsigned int speed, mode, bpw, cs, bus_width, transfer_mode; + u32 rate, val, div; + + /* Full Duplex only on 1-bit wide bus */ + if (xfer->rx_buf && xfer->tx_buf && + (xfer->rx_nbits != 1 || xfer->tx_nbits != 1)) { + dev_err(sspi->dev, + "RX and TX bus widths must be 1-bit for Full-Duplex!\n"); + return -EINVAL; + } + + if (xfer->tx_buf) { + bus_width = xfer->tx_nbits; + transfer_mode = SYNQUACER_HSSPI_TRANSFER_MODE_TX; + } else { + bus_width = xfer->rx_nbits; + transfer_mode = SYNQUACER_HSSPI_TRANSFER_MODE_RX; + } + + mode = spi->mode; + cs = spi->chip_select; + speed = xfer->speed_hz; + bpw = xfer->bits_per_word; + + /* return if nothing to change */ + if (speed == sspi->speed && + bus_width == sspi->bus_width && bpw == sspi->bpw && + mode == sspi->mode && cs == sspi->cs && + transfer_mode == sspi->transfer_mode) { + return 0; + } + + sspi->transfer_mode = transfer_mode; + rate = master->max_speed_hz; + + div = DIV_ROUND_UP(rate, speed); + if (div > 254) { + dev_err(sspi->dev, "Requested rate too low (%u)\n", + sspi->speed); + return -EINVAL; + } + + val = readl(sspi->regs + SYNQUACER_HSSPI_REG_PCC(cs)); + val &= ~SYNQUACER_HSSPI_PCC_SAFESYNC; + if (bpw == 8 && (mode & (SPI_TX_DUAL | SPI_RX_DUAL)) && div < 3) + val |= SYNQUACER_HSSPI_PCC_SAFESYNC; + if (bpw == 8 && (mode & (SPI_TX_QUAD | SPI_RX_QUAD)) && div < 6) + val |= SYNQUACER_HSSPI_PCC_SAFESYNC; + if (bpw == 16 && (mode & (SPI_TX_QUAD | SPI_RX_QUAD)) && div < 3) + val |= SYNQUACER_HSSPI_PCC_SAFESYNC; + + if (mode & SPI_CPHA) + val |= SYNQUACER_HSSPI_PCC_CPHA; + else + val &= ~SYNQUACER_HSSPI_PCC_CPHA; + + if (mode & SPI_CPOL) + val |= SYNQUACER_HSSPI_PCC_CPOL; + else + val &= ~SYNQUACER_HSSPI_PCC_CPOL; + + if (mode & SPI_CS_HIGH) + val |= SYNQUACER_HSSPI_PCC_SSPOL; + else + val &= ~SYNQUACER_HSSPI_PCC_SSPOL; + + if (mode & SPI_LSB_FIRST) + val |= SYNQUACER_HSSPI_PCC_SDIR; + else + val &= ~SYNQUACER_HSSPI_PCC_SDIR; + + if (sspi->aces) + val |= SYNQUACER_HSSPI_PCC_ACES; + else + val &= ~SYNQUACER_HSSPI_PCC_ACES; + + if (sspi->rtm) + val |= SYNQUACER_HSSPI_PCC_RTM; + else + val &= ~SYNQUACER_HSSPI_PCC_RTM; + + val |= (3 << SYNQUACER_HSSPI_PCC_SS2CD_SHIFT); + val |= SYNQUACER_HSSPI_PCC_SENDIAN; + + val &= ~(SYNQUACER_HSSPI_PCC_CDRS_MASK << + SYNQUACER_HSSPI_PCC_CDRS_SHIFT); + val |= ((div >> 1) << SYNQUACER_HSSPI_PCC_CDRS_SHIFT); + + writel(val, sspi->regs + SYNQUACER_HSSPI_REG_PCC(cs)); + + val = readl(sspi->regs + SYNQUACER_HSSPI_REG_FIFOCFG); + val &= ~(SYNQUACER_HSSPI_FIFOCFG_FIFO_WIDTH_MASK << + SYNQUACER_HSSPI_FIFOCFG_FIFO_WIDTH_SHIFT); + val |= ((bpw / 8 - 1) << SYNQUACER_HSSPI_FIFOCFG_FIFO_WIDTH_SHIFT); + writel(val, sspi->regs + SYNQUACER_HSSPI_REG_FIFOCFG); + + val = readl(sspi->regs + SYNQUACER_HSSPI_REG_DMSTART); + val &= ~(SYNQUACER_HSSPI_DMTRP_DATA_MASK << + SYNQUACER_HSSPI_DMTRP_DATA_SHIFT); + + if (xfer->rx_buf) + val |= (SYNQUACER_HSSPI_DMTRP_DATA_RX << + SYNQUACER_HSSPI_DMTRP_DATA_SHIFT); + else + val |= (SYNQUACER_HSSPI_DMTRP_DATA_TX << + SYNQUACER_HSSPI_DMTRP_DATA_SHIFT); + + val &= ~(3 << SYNQUACER_HSSPI_DMTRP_BUS_WIDTH_SHIFT); + val |= ((bus_width >> 1) << SYNQUACER_HSSPI_DMTRP_BUS_WIDTH_SHIFT); + writel(val, sspi->regs + SYNQUACER_HSSPI_REG_DMSTART); + + sspi->bpw = bpw; + sspi->mode = mode; + sspi->speed = speed; + sspi->cs = spi->chip_select; + sspi->bus_width = bus_width; + + return 0; +} + +static int synquacer_spi_transfer_one(struct spi_master *master, + struct spi_device *spi, + struct spi_transfer *xfer) +{ + struct synquacer_spi *sspi = spi_master_get_devdata(master); + int ret; + int status = 0; + u32 words; + u8 bpw; + u32 val; + + val = readl(sspi->regs + SYNQUACER_HSSPI_REG_DMSTART); + val &= ~SYNQUACER_HSSPI_DMSTOP_STOP; + writel(val, sspi->regs + SYNQUACER_HSSPI_REG_DMSTART); + + val = readl(sspi->regs + SYNQUACER_HSSPI_REG_FIFOCFG); + val |= SYNQUACER_HSSPI_FIFOCFG_RX_FLUSH; + val |= SYNQUACER_HSSPI_FIFOCFG_TX_FLUSH; + writel(val, sspi->regs + SYNQUACER_HSSPI_REG_FIFOCFG); + + /* + * See if we can transfer 4-bytes as 1 word + * to maximize the FIFO buffer efficiency. + */ + bpw = xfer->bits_per_word; + if (bpw == 8 && !(xfer->len % 4) && !(spi->mode & SPI_LSB_FIRST)) + xfer->bits_per_word = 32; + + ret = synquacer_spi_config(master, spi, xfer); + + /* restore */ + xfer->bits_per_word = bpw; + + if (ret) + return ret; + + reinit_completion(&sspi->transfer_done); + + sspi->tx_buf = xfer->tx_buf; + sspi->rx_buf = xfer->rx_buf; + + switch (sspi->bpw) { + case 8: + words = xfer->len; + break; + case 16: + words = xfer->len / 2; + break; + case 24: + /* fallthrough, should use 32-bits access */ + case 32: + words = xfer->len / 4; + break; + default: + dev_err(sspi->dev, "unsupported bpw: %d\n", sspi->bpw); + return -EINVAL; + } + + if (xfer->tx_buf) + sspi->tx_words = words; + else + sspi->tx_words = 0; + + if (xfer->rx_buf) + sspi->rx_words = words; + else + sspi->rx_words = 0; + + if (xfer->tx_buf) { + status = write_fifo(sspi); + if (status < 0) { + dev_err(sspi->dev, "failed write_fifo. status: 0x%x\n", + status); + return status; + } + } + + if (xfer->rx_buf) { + val = readl(sspi->regs + SYNQUACER_HSSPI_REG_FIFOCFG); + val &= ~(SYNQUACER_HSSPI_FIFOCFG_RX_THRESHOLD_MASK << + SYNQUACER_HSSPI_FIFOCFG_RX_THRESHOLD_SHIFT); + val |= ((sspi->rx_words > SYNQUACER_HSSPI_FIFO_DEPTH ? + SYNQUACER_HSSPI_FIFO_RX_THRESHOLD : sspi->rx_words) << + SYNQUACER_HSSPI_FIFOCFG_RX_THRESHOLD_SHIFT); + writel(val, sspi->regs + SYNQUACER_HSSPI_REG_FIFOCFG); + } + + writel(~0, sspi->regs + SYNQUACER_HSSPI_REG_TXC); + writel(~0, sspi->regs + SYNQUACER_HSSPI_REG_RXC); + + /* Trigger */ + val = readl(sspi->regs + SYNQUACER_HSSPI_REG_DMSTART); + val |= SYNQUACER_HSSPI_DMSTART_START; + writel(val, sspi->regs + SYNQUACER_HSSPI_REG_DMSTART); + + if (xfer->tx_buf) { + val = SYNQUACER_HSSPI_TXE_FIFO_EMPTY; + writel(val, sspi->regs + SYNQUACER_HSSPI_REG_TXE); + status = wait_for_completion_timeout(&sspi->transfer_done, + msecs_to_jiffies(SYNQUACER_HSSPI_TRANSFER_TMOUT_MSEC)); + writel(0, sspi->regs + SYNQUACER_HSSPI_REG_TXE); + } + + if (xfer->rx_buf) { + u32 buf[SYNQUACER_HSSPI_FIFO_DEPTH]; + + val = SYNQUACER_HSSPI_RXE_FIFO_MORE_THAN_THRESHOLD | + SYNQUACER_HSSPI_RXE_SLAVE_RELEASED; + writel(val, sspi->regs + SYNQUACER_HSSPI_REG_RXE); + status = wait_for_completion_timeout(&sspi->transfer_done, + msecs_to_jiffies(SYNQUACER_HSSPI_TRANSFER_TMOUT_MSEC)); + writel(0, sspi->regs + SYNQUACER_HSSPI_REG_RXE); + + /* stop RX and clean RXFIFO */ + val = readl(sspi->regs + SYNQUACER_HSSPI_REG_DMSTART); + val |= SYNQUACER_HSSPI_DMSTOP_STOP; + writel(val, sspi->regs + SYNQUACER_HSSPI_REG_DMSTART); + sspi->rx_buf = buf; + sspi->rx_words = SYNQUACER_HSSPI_FIFO_DEPTH; + read_fifo(sspi); + } + + if (status == 0) { + dev_err(sspi->dev, "failed to transfer. Timeout.\n"); + return -ETIMEDOUT; + } + + return 0; +} + +static void synquacer_spi_set_cs(struct spi_device *spi, bool enable) +{ + struct synquacer_spi *sspi = spi_master_get_devdata(spi->master); + u32 val; + + val = readl(sspi->regs + SYNQUACER_HSSPI_REG_DMSTART); + val &= ~(SYNQUACER_HSSPI_DMPSEL_CS_MASK << + SYNQUACER_HSSPI_DMPSEL_CS_SHIFT); + val |= spi->chip_select << SYNQUACER_HSSPI_DMPSEL_CS_SHIFT; + + if (!enable) + val |= SYNQUACER_HSSPI_DMSTOP_STOP; + + writel(val, sspi->regs + SYNQUACER_HSSPI_REG_DMSTART); +} + +static int synquacer_spi_wait_status_update(struct synquacer_spi *sspi, + bool enable) +{ + u32 val; + unsigned long timeout = jiffies + + msecs_to_jiffies(SYNQUACER_HSSPI_ENABLE_TMOUT_MSEC); + + /* wait MES(Module Enable Status) is updated */ + do { + val = readl(sspi->regs + SYNQUACER_HSSPI_REG_MCTRL) & + SYNQUACER_HSSPI_MCTRL_MES; + if (enable && val) + return 0; + if (!enable && !val) + return 0; + } while (time_before(jiffies, timeout)); + + dev_err(sspi->dev, "timeout occurs in updating Module Enable Status\n"); + return -EBUSY; +} + +static int synquacer_spi_enable(struct spi_master *master) +{ + u32 val; + int status; + struct synquacer_spi *sspi = spi_master_get_devdata(master); + + /* Disable module */ + writel(0, sspi->regs + SYNQUACER_HSSPI_REG_MCTRL); + status = synquacer_spi_wait_status_update(sspi, false); + if (status < 0) + return status; + + writel(0, sspi->regs + SYNQUACER_HSSPI_REG_TXE); + writel(0, sspi->regs + SYNQUACER_HSSPI_REG_RXE); + writel(~0, sspi->regs + SYNQUACER_HSSPI_REG_TXC); + writel(~0, sspi->regs + SYNQUACER_HSSPI_REG_RXC); + writel(~0, sspi->regs + SYNQUACER_HSSPI_REG_FAULTC); + + val = readl(sspi->regs + SYNQUACER_HSSPI_REG_DMCFG); + val &= ~SYNQUACER_HSSPI_DMCFG_SSDC; + val &= ~SYNQUACER_HSSPI_DMCFG_MSTARTEN; + writel(val, sspi->regs + SYNQUACER_HSSPI_REG_DMCFG); + + val = readl(sspi->regs + SYNQUACER_HSSPI_REG_MCTRL); + if (sspi->clk_src_type == SYNQUACER_HSSPI_CLOCK_SRC_IPCLK) + val |= SYNQUACER_HSSPI_MCTRL_CDSS; + else + val &= ~SYNQUACER_HSSPI_MCTRL_CDSS; + + val &= ~SYNQUACER_HSSPI_MCTRL_COMMAND_SEQUENCE_EN; + val |= SYNQUACER_HSSPI_MCTRL_MEN; + val |= SYNQUACER_HSSPI_MCTRL_SYNCON; + + /* Enable module */ + writel(val, sspi->regs + SYNQUACER_HSSPI_REG_MCTRL); + status = synquacer_spi_wait_status_update(sspi, true); + if (status < 0) + return status; + + return 0; +} + +static irqreturn_t sq_spi_rx_handler(int irq, void *priv) +{ + uint32_t val; + struct synquacer_spi *sspi = priv; + + val = readl(sspi->regs + SYNQUACER_HSSPI_REG_RXF); + if ((val & SYNQUACER_HSSPI_RXF_SLAVE_RELEASED) || + (val & SYNQUACER_HSSPI_RXF_FIFO_MORE_THAN_THRESHOLD)) { + read_fifo(sspi); + + if (sspi->rx_words == 0) { + writel(0, sspi->regs + SYNQUACER_HSSPI_REG_RXE); + complete(&sspi->transfer_done); + } + return IRQ_HANDLED; + } + + return IRQ_NONE; +} + +static irqreturn_t sq_spi_tx_handler(int irq, void *priv) +{ + uint32_t val; + struct synquacer_spi *sspi = priv; + + val = readl(sspi->regs + SYNQUACER_HSSPI_REG_TXF); + if (val & SYNQUACER_HSSPI_TXF_FIFO_EMPTY) { + if (sspi->tx_words == 0) { + writel(0, sspi->regs + SYNQUACER_HSSPI_REG_TXE); + complete(&sspi->transfer_done); + } else { + write_fifo(sspi); + } + return IRQ_HANDLED; + } + + return IRQ_NONE; +} + +static int synquacer_spi_probe(struct platform_device *pdev) +{ + struct device_node *np = pdev->dev.of_node; + struct spi_master *master; + struct synquacer_spi *sspi; + int ret; + int rx_irq, tx_irq; + + master = spi_alloc_master(&pdev->dev, sizeof(*sspi)); + if (!master) + return -ENOMEM; + + platform_set_drvdata(pdev, master); + + sspi = spi_master_get_devdata(master); + sspi->dev = &pdev->dev; + + init_completion(&sspi->transfer_done); + + sspi->regs = devm_platform_ioremap_resource(pdev, 0); + if (IS_ERR(sspi->regs)) { + ret = PTR_ERR(sspi->regs); + goto put_spi; + } + + sspi->clk_src_type = SYNQUACER_HSSPI_CLOCK_SRC_IHCLK; /* Default */ + device_property_read_u32(&pdev->dev, "socionext,ihclk-rate", + &master->max_speed_hz); /* for ACPI */ + + if (dev_of_node(&pdev->dev)) { + if (device_property_match_string(&pdev->dev, + "clock-names", "iHCLK") >= 0) { + sspi->clk_src_type = SYNQUACER_HSSPI_CLOCK_SRC_IHCLK; + sspi->clk = devm_clk_get(sspi->dev, "iHCLK"); + } else if (device_property_match_string(&pdev->dev, + "clock-names", "iPCLK") >= 0) { + sspi->clk_src_type = SYNQUACER_HSSPI_CLOCK_SRC_IPCLK; + sspi->clk = devm_clk_get(sspi->dev, "iPCLK"); + } else { + dev_err(&pdev->dev, "specified wrong clock source\n"); + ret = -EINVAL; + goto put_spi; + } + + if (IS_ERR(sspi->clk)) { + ret = dev_err_probe(&pdev->dev, PTR_ERR(sspi->clk), + "clock not found\n"); + goto put_spi; + } + + ret = clk_prepare_enable(sspi->clk); + if (ret) { + dev_err(&pdev->dev, "failed to enable clock (%d)\n", + ret); + goto put_spi; + } + + master->max_speed_hz = clk_get_rate(sspi->clk); + } + + if (!master->max_speed_hz) { + dev_err(&pdev->dev, "missing clock source\n"); + ret = -EINVAL; + goto disable_clk; + } + master->min_speed_hz = master->max_speed_hz / 254; + + sspi->aces = device_property_read_bool(&pdev->dev, + "socionext,set-aces"); + sspi->rtm = device_property_read_bool(&pdev->dev, "socionext,use-rtm"); + + master->num_chipselect = SYNQUACER_HSSPI_NUM_CHIP_SELECT; + + rx_irq = platform_get_irq(pdev, 0); + if (rx_irq <= 0) { + ret = rx_irq; + goto disable_clk; + } + snprintf(sspi->rx_irq_name, SYNQUACER_HSSPI_IRQ_NAME_MAX, "%s-rx", + dev_name(&pdev->dev)); + ret = devm_request_irq(&pdev->dev, rx_irq, sq_spi_rx_handler, + 0, sspi->rx_irq_name, sspi); + if (ret) { + dev_err(&pdev->dev, "request rx_irq failed (%d)\n", ret); + goto disable_clk; + } + + tx_irq = platform_get_irq(pdev, 1); + if (tx_irq <= 0) { + ret = tx_irq; + goto disable_clk; + } + snprintf(sspi->tx_irq_name, SYNQUACER_HSSPI_IRQ_NAME_MAX, "%s-tx", + dev_name(&pdev->dev)); + ret = devm_request_irq(&pdev->dev, tx_irq, sq_spi_tx_handler, + 0, sspi->tx_irq_name, sspi); + if (ret) { + dev_err(&pdev->dev, "request tx_irq failed (%d)\n", ret); + goto disable_clk; + } + + master->dev.of_node = np; + master->dev.fwnode = pdev->dev.fwnode; + master->auto_runtime_pm = true; + master->bus_num = pdev->id; + + master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_TX_DUAL | SPI_RX_DUAL | + SPI_TX_QUAD | SPI_RX_QUAD; + master->bits_per_word_mask = SPI_BPW_MASK(32) | SPI_BPW_MASK(24) | + SPI_BPW_MASK(16) | SPI_BPW_MASK(8); + + master->set_cs = synquacer_spi_set_cs; + master->transfer_one = synquacer_spi_transfer_one; + + ret = synquacer_spi_enable(master); + if (ret) + goto disable_clk; + + pm_runtime_set_active(sspi->dev); + pm_runtime_enable(sspi->dev); + + ret = devm_spi_register_master(sspi->dev, master); + if (ret) + goto disable_pm; + + return 0; + +disable_pm: + pm_runtime_disable(sspi->dev); +disable_clk: + clk_disable_unprepare(sspi->clk); +put_spi: + spi_master_put(master); + + return ret; +} + +static int synquacer_spi_remove(struct platform_device *pdev) +{ + struct spi_master *master = platform_get_drvdata(pdev); + struct synquacer_spi *sspi = spi_master_get_devdata(master); + + pm_runtime_disable(sspi->dev); + + clk_disable_unprepare(sspi->clk); + + return 0; +} + +static int __maybe_unused synquacer_spi_suspend(struct device *dev) +{ + struct spi_master *master = dev_get_drvdata(dev); + struct synquacer_spi *sspi = spi_master_get_devdata(master); + int ret; + + ret = spi_master_suspend(master); + if (ret) + return ret; + + if (!pm_runtime_suspended(dev)) + clk_disable_unprepare(sspi->clk); + + return ret; +} + +static int __maybe_unused synquacer_spi_resume(struct device *dev) +{ + struct spi_master *master = dev_get_drvdata(dev); + struct synquacer_spi *sspi = spi_master_get_devdata(master); + int ret; + + if (!pm_runtime_suspended(dev)) { + /* Ensure reconfigure during next xfer */ + sspi->speed = 0; + + ret = clk_prepare_enable(sspi->clk); + if (ret < 0) { + dev_err(dev, "failed to enable clk (%d)\n", + ret); + return ret; + } + + ret = synquacer_spi_enable(master); + if (ret) { + clk_disable_unprepare(sspi->clk); + dev_err(dev, "failed to enable spi (%d)\n", ret); + return ret; + } + } + + ret = spi_master_resume(master); + if (ret < 0) + clk_disable_unprepare(sspi->clk); + + return ret; +} + +static SIMPLE_DEV_PM_OPS(synquacer_spi_pm_ops, synquacer_spi_suspend, + synquacer_spi_resume); + +static const struct of_device_id synquacer_spi_of_match[] = { + {.compatible = "socionext,synquacer-spi"}, + {} +}; +MODULE_DEVICE_TABLE(of, synquacer_spi_of_match); + +#ifdef CONFIG_ACPI +static const struct acpi_device_id synquacer_hsspi_acpi_ids[] = { + { "SCX0004" }, + { /* sentinel */ } +}; +MODULE_DEVICE_TABLE(acpi, synquacer_hsspi_acpi_ids); +#endif + +static struct platform_driver synquacer_spi_driver = { + .driver = { + .name = "synquacer-spi", + .pm = &synquacer_spi_pm_ops, + .of_match_table = synquacer_spi_of_match, + .acpi_match_table = ACPI_PTR(synquacer_hsspi_acpi_ids), + }, + .probe = synquacer_spi_probe, + .remove = synquacer_spi_remove, +}; +module_platform_driver(synquacer_spi_driver); + +MODULE_DESCRIPTION("Socionext Synquacer HS-SPI controller driver"); +MODULE_AUTHOR("Masahisa Kojima <masahisa.kojima@linaro.org>"); +MODULE_AUTHOR("Jassi Brar <jaswinder.singh@linaro.org>"); +MODULE_LICENSE("GPL v2"); diff --git a/drivers/spi/spi-tegra114.c b/drivers/spi/spi-tegra114.c new file mode 100644 index 000000000..ed42665b1 --- /dev/null +++ b/drivers/spi/spi-tegra114.c @@ -0,0 +1,1540 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * SPI driver for NVIDIA's Tegra114 SPI Controller. + * + * Copyright (c) 2013, NVIDIA CORPORATION. All rights reserved. + */ + +#include <linux/clk.h> +#include <linux/completion.h> +#include <linux/delay.h> +#include <linux/dmaengine.h> +#include <linux/dma-mapping.h> +#include <linux/dmapool.h> +#include <linux/err.h> +#include <linux/interrupt.h> +#include <linux/io.h> +#include <linux/kernel.h> +#include <linux/kthread.h> +#include <linux/module.h> +#include <linux/platform_device.h> +#include <linux/pm_runtime.h> +#include <linux/of.h> +#include <linux/of_device.h> +#include <linux/reset.h> +#include <linux/spi/spi.h> + +#define SPI_COMMAND1 0x000 +#define SPI_BIT_LENGTH(x) (((x) & 0x1f) << 0) +#define SPI_PACKED (1 << 5) +#define SPI_TX_EN (1 << 11) +#define SPI_RX_EN (1 << 12) +#define SPI_BOTH_EN_BYTE (1 << 13) +#define SPI_BOTH_EN_BIT (1 << 14) +#define SPI_LSBYTE_FE (1 << 15) +#define SPI_LSBIT_FE (1 << 16) +#define SPI_BIDIROE (1 << 17) +#define SPI_IDLE_SDA_DRIVE_LOW (0 << 18) +#define SPI_IDLE_SDA_DRIVE_HIGH (1 << 18) +#define SPI_IDLE_SDA_PULL_LOW (2 << 18) +#define SPI_IDLE_SDA_PULL_HIGH (3 << 18) +#define SPI_IDLE_SDA_MASK (3 << 18) +#define SPI_CS_SW_VAL (1 << 20) +#define SPI_CS_SW_HW (1 << 21) +/* SPI_CS_POL_INACTIVE bits are default high */ + /* n from 0 to 3 */ +#define SPI_CS_POL_INACTIVE(n) (1 << (22 + (n))) +#define SPI_CS_POL_INACTIVE_MASK (0xF << 22) + +#define SPI_CS_SEL_0 (0 << 26) +#define SPI_CS_SEL_1 (1 << 26) +#define SPI_CS_SEL_2 (2 << 26) +#define SPI_CS_SEL_3 (3 << 26) +#define SPI_CS_SEL_MASK (3 << 26) +#define SPI_CS_SEL(x) (((x) & 0x3) << 26) +#define SPI_CONTROL_MODE_0 (0 << 28) +#define SPI_CONTROL_MODE_1 (1 << 28) +#define SPI_CONTROL_MODE_2 (2 << 28) +#define SPI_CONTROL_MODE_3 (3 << 28) +#define SPI_CONTROL_MODE_MASK (3 << 28) +#define SPI_MODE_SEL(x) (((x) & 0x3) << 28) +#define SPI_M_S (1 << 30) +#define SPI_PIO (1 << 31) + +#define SPI_COMMAND2 0x004 +#define SPI_TX_TAP_DELAY(x) (((x) & 0x3F) << 6) +#define SPI_RX_TAP_DELAY(x) (((x) & 0x3F) << 0) + +#define SPI_CS_TIMING1 0x008 +#define SPI_SETUP_HOLD(setup, hold) (((setup) << 4) | (hold)) +#define SPI_CS_SETUP_HOLD(reg, cs, val) \ + ((((val) & 0xFFu) << ((cs) * 8)) | \ + ((reg) & ~(0xFFu << ((cs) * 8)))) + +#define SPI_CS_TIMING2 0x00C +#define CYCLES_BETWEEN_PACKETS_0(x) (((x) & 0x1F) << 0) +#define CS_ACTIVE_BETWEEN_PACKETS_0 (1 << 5) +#define CYCLES_BETWEEN_PACKETS_1(x) (((x) & 0x1F) << 8) +#define CS_ACTIVE_BETWEEN_PACKETS_1 (1 << 13) +#define CYCLES_BETWEEN_PACKETS_2(x) (((x) & 0x1F) << 16) +#define CS_ACTIVE_BETWEEN_PACKETS_2 (1 << 21) +#define CYCLES_BETWEEN_PACKETS_3(x) (((x) & 0x1F) << 24) +#define CS_ACTIVE_BETWEEN_PACKETS_3 (1 << 29) +#define SPI_SET_CS_ACTIVE_BETWEEN_PACKETS(reg, cs, val) \ + (reg = (((val) & 0x1) << ((cs) * 8 + 5)) | \ + ((reg) & ~(1 << ((cs) * 8 + 5)))) +#define SPI_SET_CYCLES_BETWEEN_PACKETS(reg, cs, val) \ + (reg = (((val) & 0x1F) << ((cs) * 8)) | \ + ((reg) & ~(0x1F << ((cs) * 8)))) +#define MAX_SETUP_HOLD_CYCLES 16 +#define MAX_INACTIVE_CYCLES 32 + +#define SPI_TRANS_STATUS 0x010 +#define SPI_BLK_CNT(val) (((val) >> 0) & 0xFFFF) +#define SPI_SLV_IDLE_COUNT(val) (((val) >> 16) & 0xFF) +#define SPI_RDY (1 << 30) + +#define SPI_FIFO_STATUS 0x014 +#define SPI_RX_FIFO_EMPTY (1 << 0) +#define SPI_RX_FIFO_FULL (1 << 1) +#define SPI_TX_FIFO_EMPTY (1 << 2) +#define SPI_TX_FIFO_FULL (1 << 3) +#define SPI_RX_FIFO_UNF (1 << 4) +#define SPI_RX_FIFO_OVF (1 << 5) +#define SPI_TX_FIFO_UNF (1 << 6) +#define SPI_TX_FIFO_OVF (1 << 7) +#define SPI_ERR (1 << 8) +#define SPI_TX_FIFO_FLUSH (1 << 14) +#define SPI_RX_FIFO_FLUSH (1 << 15) +#define SPI_TX_FIFO_EMPTY_COUNT(val) (((val) >> 16) & 0x7F) +#define SPI_RX_FIFO_FULL_COUNT(val) (((val) >> 23) & 0x7F) +#define SPI_FRAME_END (1 << 30) +#define SPI_CS_INACTIVE (1 << 31) + +#define SPI_FIFO_ERROR (SPI_RX_FIFO_UNF | \ + SPI_RX_FIFO_OVF | SPI_TX_FIFO_UNF | SPI_TX_FIFO_OVF) +#define SPI_FIFO_EMPTY (SPI_RX_FIFO_EMPTY | SPI_TX_FIFO_EMPTY) + +#define SPI_TX_DATA 0x018 +#define SPI_RX_DATA 0x01C + +#define SPI_DMA_CTL 0x020 +#define SPI_TX_TRIG_1 (0 << 15) +#define SPI_TX_TRIG_4 (1 << 15) +#define SPI_TX_TRIG_8 (2 << 15) +#define SPI_TX_TRIG_16 (3 << 15) +#define SPI_TX_TRIG_MASK (3 << 15) +#define SPI_RX_TRIG_1 (0 << 19) +#define SPI_RX_TRIG_4 (1 << 19) +#define SPI_RX_TRIG_8 (2 << 19) +#define SPI_RX_TRIG_16 (3 << 19) +#define SPI_RX_TRIG_MASK (3 << 19) +#define SPI_IE_TX (1 << 28) +#define SPI_IE_RX (1 << 29) +#define SPI_CONT (1 << 30) +#define SPI_DMA (1 << 31) +#define SPI_DMA_EN SPI_DMA + +#define SPI_DMA_BLK 0x024 +#define SPI_DMA_BLK_SET(x) (((x) & 0xFFFF) << 0) + +#define SPI_TX_FIFO 0x108 +#define SPI_RX_FIFO 0x188 +#define SPI_INTR_MASK 0x18c +#define SPI_INTR_ALL_MASK (0x1fUL << 25) +#define MAX_CHIP_SELECT 4 +#define SPI_FIFO_DEPTH 64 +#define DATA_DIR_TX (1 << 0) +#define DATA_DIR_RX (1 << 1) + +#define SPI_DMA_TIMEOUT (msecs_to_jiffies(1000)) +#define DEFAULT_SPI_DMA_BUF_LEN (16*1024) +#define TX_FIFO_EMPTY_COUNT_MAX SPI_TX_FIFO_EMPTY_COUNT(0x40) +#define RX_FIFO_FULL_COUNT_ZERO SPI_RX_FIFO_FULL_COUNT(0) +#define MAX_HOLD_CYCLES 16 +#define SPI_DEFAULT_SPEED 25000000 + +struct tegra_spi_soc_data { + bool has_intr_mask_reg; +}; + +struct tegra_spi_client_data { + int tx_clk_tap_delay; + int rx_clk_tap_delay; +}; + +struct tegra_spi_data { + struct device *dev; + struct spi_master *master; + spinlock_t lock; + + struct clk *clk; + struct reset_control *rst; + void __iomem *base; + phys_addr_t phys; + unsigned irq; + u32 cur_speed; + + struct spi_device *cur_spi; + struct spi_device *cs_control; + unsigned cur_pos; + unsigned words_per_32bit; + unsigned bytes_per_word; + unsigned curr_dma_words; + unsigned cur_direction; + + unsigned cur_rx_pos; + unsigned cur_tx_pos; + + unsigned dma_buf_size; + unsigned max_buf_size; + bool is_curr_dma_xfer; + bool use_hw_based_cs; + + struct completion rx_dma_complete; + struct completion tx_dma_complete; + + u32 tx_status; + u32 rx_status; + u32 status_reg; + bool is_packed; + + u32 command1_reg; + u32 dma_control_reg; + u32 def_command1_reg; + u32 def_command2_reg; + u32 spi_cs_timing1; + u32 spi_cs_timing2; + u8 last_used_cs; + + struct completion xfer_completion; + struct spi_transfer *curr_xfer; + struct dma_chan *rx_dma_chan; + u32 *rx_dma_buf; + dma_addr_t rx_dma_phys; + struct dma_async_tx_descriptor *rx_dma_desc; + + struct dma_chan *tx_dma_chan; + u32 *tx_dma_buf; + dma_addr_t tx_dma_phys; + struct dma_async_tx_descriptor *tx_dma_desc; + const struct tegra_spi_soc_data *soc_data; +}; + +static int tegra_spi_runtime_suspend(struct device *dev); +static int tegra_spi_runtime_resume(struct device *dev); + +static inline u32 tegra_spi_readl(struct tegra_spi_data *tspi, + unsigned long reg) +{ + return readl(tspi->base + reg); +} + +static inline void tegra_spi_writel(struct tegra_spi_data *tspi, + u32 val, unsigned long reg) +{ + writel(val, tspi->base + reg); + + /* Read back register to make sure that register writes completed */ + if (reg != SPI_TX_FIFO) + readl(tspi->base + SPI_COMMAND1); +} + +static void tegra_spi_clear_status(struct tegra_spi_data *tspi) +{ + u32 val; + + /* Write 1 to clear status register */ + val = tegra_spi_readl(tspi, SPI_TRANS_STATUS); + tegra_spi_writel(tspi, val, SPI_TRANS_STATUS); + + /* Clear fifo status error if any */ + val = tegra_spi_readl(tspi, SPI_FIFO_STATUS); + if (val & SPI_ERR) + tegra_spi_writel(tspi, SPI_ERR | SPI_FIFO_ERROR, + SPI_FIFO_STATUS); +} + +static unsigned tegra_spi_calculate_curr_xfer_param( + struct spi_device *spi, struct tegra_spi_data *tspi, + struct spi_transfer *t) +{ + unsigned remain_len = t->len - tspi->cur_pos; + unsigned max_word; + unsigned bits_per_word = t->bits_per_word; + unsigned max_len; + unsigned total_fifo_words; + + tspi->bytes_per_word = DIV_ROUND_UP(bits_per_word, 8); + + if ((bits_per_word == 8 || bits_per_word == 16 || + bits_per_word == 32) && t->len > 3) { + tspi->is_packed = true; + tspi->words_per_32bit = 32/bits_per_word; + } else { + tspi->is_packed = false; + tspi->words_per_32bit = 1; + } + + if (tspi->is_packed) { + max_len = min(remain_len, tspi->max_buf_size); + tspi->curr_dma_words = max_len/tspi->bytes_per_word; + total_fifo_words = (max_len + 3) / 4; + } else { + max_word = (remain_len - 1) / tspi->bytes_per_word + 1; + max_word = min(max_word, tspi->max_buf_size/4); + tspi->curr_dma_words = max_word; + total_fifo_words = max_word; + } + return total_fifo_words; +} + +static unsigned tegra_spi_fill_tx_fifo_from_client_txbuf( + struct tegra_spi_data *tspi, struct spi_transfer *t) +{ + unsigned nbytes; + unsigned tx_empty_count; + u32 fifo_status; + unsigned max_n_32bit; + unsigned i, count; + unsigned int written_words; + unsigned fifo_words_left; + u8 *tx_buf = (u8 *)t->tx_buf + tspi->cur_tx_pos; + + fifo_status = tegra_spi_readl(tspi, SPI_FIFO_STATUS); + tx_empty_count = SPI_TX_FIFO_EMPTY_COUNT(fifo_status); + + if (tspi->is_packed) { + fifo_words_left = tx_empty_count * tspi->words_per_32bit; + written_words = min(fifo_words_left, tspi->curr_dma_words); + nbytes = written_words * tspi->bytes_per_word; + max_n_32bit = DIV_ROUND_UP(nbytes, 4); + for (count = 0; count < max_n_32bit; count++) { + u32 x = 0; + + for (i = 0; (i < 4) && nbytes; i++, nbytes--) + x |= (u32)(*tx_buf++) << (i * 8); + tegra_spi_writel(tspi, x, SPI_TX_FIFO); + } + + tspi->cur_tx_pos += written_words * tspi->bytes_per_word; + } else { + unsigned int write_bytes; + max_n_32bit = min(tspi->curr_dma_words, tx_empty_count); + written_words = max_n_32bit; + nbytes = written_words * tspi->bytes_per_word; + if (nbytes > t->len - tspi->cur_pos) + nbytes = t->len - tspi->cur_pos; + write_bytes = nbytes; + for (count = 0; count < max_n_32bit; count++) { + u32 x = 0; + + for (i = 0; nbytes && (i < tspi->bytes_per_word); + i++, nbytes--) + x |= (u32)(*tx_buf++) << (i * 8); + tegra_spi_writel(tspi, x, SPI_TX_FIFO); + } + + tspi->cur_tx_pos += write_bytes; + } + + return written_words; +} + +static unsigned int tegra_spi_read_rx_fifo_to_client_rxbuf( + struct tegra_spi_data *tspi, struct spi_transfer *t) +{ + unsigned rx_full_count; + u32 fifo_status; + unsigned i, count; + unsigned int read_words = 0; + unsigned len; + u8 *rx_buf = (u8 *)t->rx_buf + tspi->cur_rx_pos; + + fifo_status = tegra_spi_readl(tspi, SPI_FIFO_STATUS); + rx_full_count = SPI_RX_FIFO_FULL_COUNT(fifo_status); + if (tspi->is_packed) { + len = tspi->curr_dma_words * tspi->bytes_per_word; + for (count = 0; count < rx_full_count; count++) { + u32 x = tegra_spi_readl(tspi, SPI_RX_FIFO); + + for (i = 0; len && (i < 4); i++, len--) + *rx_buf++ = (x >> i*8) & 0xFF; + } + read_words += tspi->curr_dma_words; + tspi->cur_rx_pos += tspi->curr_dma_words * tspi->bytes_per_word; + } else { + u32 rx_mask = ((u32)1 << t->bits_per_word) - 1; + u8 bytes_per_word = tspi->bytes_per_word; + unsigned int read_bytes; + + len = rx_full_count * bytes_per_word; + if (len > t->len - tspi->cur_pos) + len = t->len - tspi->cur_pos; + read_bytes = len; + for (count = 0; count < rx_full_count; count++) { + u32 x = tegra_spi_readl(tspi, SPI_RX_FIFO) & rx_mask; + + for (i = 0; len && (i < bytes_per_word); i++, len--) + *rx_buf++ = (x >> (i*8)) & 0xFF; + } + read_words += rx_full_count; + tspi->cur_rx_pos += read_bytes; + } + + return read_words; +} + +static void tegra_spi_copy_client_txbuf_to_spi_txbuf( + struct tegra_spi_data *tspi, struct spi_transfer *t) +{ + /* Make the dma buffer to read by cpu */ + dma_sync_single_for_cpu(tspi->dev, tspi->tx_dma_phys, + tspi->dma_buf_size, DMA_TO_DEVICE); + + if (tspi->is_packed) { + unsigned len = tspi->curr_dma_words * tspi->bytes_per_word; + + memcpy(tspi->tx_dma_buf, t->tx_buf + tspi->cur_pos, len); + tspi->cur_tx_pos += tspi->curr_dma_words * tspi->bytes_per_word; + } else { + unsigned int i; + unsigned int count; + u8 *tx_buf = (u8 *)t->tx_buf + tspi->cur_tx_pos; + unsigned consume = tspi->curr_dma_words * tspi->bytes_per_word; + unsigned int write_bytes; + + if (consume > t->len - tspi->cur_pos) + consume = t->len - tspi->cur_pos; + write_bytes = consume; + for (count = 0; count < tspi->curr_dma_words; count++) { + u32 x = 0; + + for (i = 0; consume && (i < tspi->bytes_per_word); + i++, consume--) + x |= (u32)(*tx_buf++) << (i * 8); + tspi->tx_dma_buf[count] = x; + } + + tspi->cur_tx_pos += write_bytes; + } + + /* Make the dma buffer to read by dma */ + dma_sync_single_for_device(tspi->dev, tspi->tx_dma_phys, + tspi->dma_buf_size, DMA_TO_DEVICE); +} + +static void tegra_spi_copy_spi_rxbuf_to_client_rxbuf( + struct tegra_spi_data *tspi, struct spi_transfer *t) +{ + /* Make the dma buffer to read by cpu */ + dma_sync_single_for_cpu(tspi->dev, tspi->rx_dma_phys, + tspi->dma_buf_size, DMA_FROM_DEVICE); + + if (tspi->is_packed) { + unsigned len = tspi->curr_dma_words * tspi->bytes_per_word; + + memcpy(t->rx_buf + tspi->cur_rx_pos, tspi->rx_dma_buf, len); + tspi->cur_rx_pos += tspi->curr_dma_words * tspi->bytes_per_word; + } else { + unsigned int i; + unsigned int count; + unsigned char *rx_buf = t->rx_buf + tspi->cur_rx_pos; + u32 rx_mask = ((u32)1 << t->bits_per_word) - 1; + unsigned consume = tspi->curr_dma_words * tspi->bytes_per_word; + unsigned int read_bytes; + + if (consume > t->len - tspi->cur_pos) + consume = t->len - tspi->cur_pos; + read_bytes = consume; + for (count = 0; count < tspi->curr_dma_words; count++) { + u32 x = tspi->rx_dma_buf[count] & rx_mask; + + for (i = 0; consume && (i < tspi->bytes_per_word); + i++, consume--) + *rx_buf++ = (x >> (i*8)) & 0xFF; + } + + tspi->cur_rx_pos += read_bytes; + } + + /* Make the dma buffer to read by dma */ + dma_sync_single_for_device(tspi->dev, tspi->rx_dma_phys, + tspi->dma_buf_size, DMA_FROM_DEVICE); +} + +static void tegra_spi_dma_complete(void *args) +{ + struct completion *dma_complete = args; + + complete(dma_complete); +} + +static int tegra_spi_start_tx_dma(struct tegra_spi_data *tspi, int len) +{ + reinit_completion(&tspi->tx_dma_complete); + tspi->tx_dma_desc = dmaengine_prep_slave_single(tspi->tx_dma_chan, + tspi->tx_dma_phys, len, DMA_MEM_TO_DEV, + DMA_PREP_INTERRUPT | DMA_CTRL_ACK); + if (!tspi->tx_dma_desc) { + dev_err(tspi->dev, "Not able to get desc for Tx\n"); + return -EIO; + } + + tspi->tx_dma_desc->callback = tegra_spi_dma_complete; + tspi->tx_dma_desc->callback_param = &tspi->tx_dma_complete; + + dmaengine_submit(tspi->tx_dma_desc); + dma_async_issue_pending(tspi->tx_dma_chan); + return 0; +} + +static int tegra_spi_start_rx_dma(struct tegra_spi_data *tspi, int len) +{ + reinit_completion(&tspi->rx_dma_complete); + tspi->rx_dma_desc = dmaengine_prep_slave_single(tspi->rx_dma_chan, + tspi->rx_dma_phys, len, DMA_DEV_TO_MEM, + DMA_PREP_INTERRUPT | DMA_CTRL_ACK); + if (!tspi->rx_dma_desc) { + dev_err(tspi->dev, "Not able to get desc for Rx\n"); + return -EIO; + } + + tspi->rx_dma_desc->callback = tegra_spi_dma_complete; + tspi->rx_dma_desc->callback_param = &tspi->rx_dma_complete; + + dmaengine_submit(tspi->rx_dma_desc); + dma_async_issue_pending(tspi->rx_dma_chan); + return 0; +} + +static int tegra_spi_flush_fifos(struct tegra_spi_data *tspi) +{ + unsigned long timeout = jiffies + HZ; + u32 status; + + status = tegra_spi_readl(tspi, SPI_FIFO_STATUS); + if ((status & SPI_FIFO_EMPTY) != SPI_FIFO_EMPTY) { + status |= SPI_RX_FIFO_FLUSH | SPI_TX_FIFO_FLUSH; + tegra_spi_writel(tspi, status, SPI_FIFO_STATUS); + while ((status & SPI_FIFO_EMPTY) != SPI_FIFO_EMPTY) { + status = tegra_spi_readl(tspi, SPI_FIFO_STATUS); + if (time_after(jiffies, timeout)) { + dev_err(tspi->dev, + "timeout waiting for fifo flush\n"); + return -EIO; + } + + udelay(1); + } + } + + return 0; +} + +static int tegra_spi_start_dma_based_transfer( + struct tegra_spi_data *tspi, struct spi_transfer *t) +{ + u32 val; + unsigned int len; + int ret = 0; + u8 dma_burst; + struct dma_slave_config dma_sconfig = {0}; + + val = SPI_DMA_BLK_SET(tspi->curr_dma_words - 1); + tegra_spi_writel(tspi, val, SPI_DMA_BLK); + + if (tspi->is_packed) + len = DIV_ROUND_UP(tspi->curr_dma_words * tspi->bytes_per_word, + 4) * 4; + else + len = tspi->curr_dma_words * 4; + + /* Set attention level based on length of transfer */ + if (len & 0xF) { + val |= SPI_TX_TRIG_1 | SPI_RX_TRIG_1; + dma_burst = 1; + } else if (((len) >> 4) & 0x1) { + val |= SPI_TX_TRIG_4 | SPI_RX_TRIG_4; + dma_burst = 4; + } else { + val |= SPI_TX_TRIG_8 | SPI_RX_TRIG_8; + dma_burst = 8; + } + + if (!tspi->soc_data->has_intr_mask_reg) { + if (tspi->cur_direction & DATA_DIR_TX) + val |= SPI_IE_TX; + + if (tspi->cur_direction & DATA_DIR_RX) + val |= SPI_IE_RX; + } + + tegra_spi_writel(tspi, val, SPI_DMA_CTL); + tspi->dma_control_reg = val; + + dma_sconfig.device_fc = true; + if (tspi->cur_direction & DATA_DIR_TX) { + dma_sconfig.dst_addr = tspi->phys + SPI_TX_FIFO; + dma_sconfig.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES; + dma_sconfig.dst_maxburst = dma_burst; + ret = dmaengine_slave_config(tspi->tx_dma_chan, &dma_sconfig); + if (ret < 0) { + dev_err(tspi->dev, + "DMA slave config failed: %d\n", ret); + return ret; + } + + tegra_spi_copy_client_txbuf_to_spi_txbuf(tspi, t); + ret = tegra_spi_start_tx_dma(tspi, len); + if (ret < 0) { + dev_err(tspi->dev, + "Starting tx dma failed, err %d\n", ret); + return ret; + } + } + + if (tspi->cur_direction & DATA_DIR_RX) { + dma_sconfig.src_addr = tspi->phys + SPI_RX_FIFO; + dma_sconfig.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES; + dma_sconfig.src_maxburst = dma_burst; + ret = dmaengine_slave_config(tspi->rx_dma_chan, &dma_sconfig); + if (ret < 0) { + dev_err(tspi->dev, + "DMA slave config failed: %d\n", ret); + return ret; + } + + /* Make the dma buffer to read by dma */ + dma_sync_single_for_device(tspi->dev, tspi->rx_dma_phys, + tspi->dma_buf_size, DMA_FROM_DEVICE); + + ret = tegra_spi_start_rx_dma(tspi, len); + if (ret < 0) { + dev_err(tspi->dev, + "Starting rx dma failed, err %d\n", ret); + if (tspi->cur_direction & DATA_DIR_TX) + dmaengine_terminate_all(tspi->tx_dma_chan); + return ret; + } + } + tspi->is_curr_dma_xfer = true; + tspi->dma_control_reg = val; + + val |= SPI_DMA_EN; + tegra_spi_writel(tspi, val, SPI_DMA_CTL); + return ret; +} + +static int tegra_spi_start_cpu_based_transfer( + struct tegra_spi_data *tspi, struct spi_transfer *t) +{ + u32 val; + unsigned cur_words; + + if (tspi->cur_direction & DATA_DIR_TX) + cur_words = tegra_spi_fill_tx_fifo_from_client_txbuf(tspi, t); + else + cur_words = tspi->curr_dma_words; + + val = SPI_DMA_BLK_SET(cur_words - 1); + tegra_spi_writel(tspi, val, SPI_DMA_BLK); + + val = 0; + if (tspi->cur_direction & DATA_DIR_TX) + val |= SPI_IE_TX; + + if (tspi->cur_direction & DATA_DIR_RX) + val |= SPI_IE_RX; + + tegra_spi_writel(tspi, val, SPI_DMA_CTL); + tspi->dma_control_reg = val; + + tspi->is_curr_dma_xfer = false; + + val = tspi->command1_reg; + val |= SPI_PIO; + tegra_spi_writel(tspi, val, SPI_COMMAND1); + return 0; +} + +static int tegra_spi_init_dma_param(struct tegra_spi_data *tspi, + bool dma_to_memory) +{ + struct dma_chan *dma_chan; + u32 *dma_buf; + dma_addr_t dma_phys; + + dma_chan = dma_request_chan(tspi->dev, dma_to_memory ? "rx" : "tx"); + if (IS_ERR(dma_chan)) + return dev_err_probe(tspi->dev, PTR_ERR(dma_chan), + "Dma channel is not available\n"); + + dma_buf = dma_alloc_coherent(tspi->dev, tspi->dma_buf_size, + &dma_phys, GFP_KERNEL); + if (!dma_buf) { + dev_err(tspi->dev, " Not able to allocate the dma buffer\n"); + dma_release_channel(dma_chan); + return -ENOMEM; + } + + if (dma_to_memory) { + tspi->rx_dma_chan = dma_chan; + tspi->rx_dma_buf = dma_buf; + tspi->rx_dma_phys = dma_phys; + } else { + tspi->tx_dma_chan = dma_chan; + tspi->tx_dma_buf = dma_buf; + tspi->tx_dma_phys = dma_phys; + } + return 0; +} + +static void tegra_spi_deinit_dma_param(struct tegra_spi_data *tspi, + bool dma_to_memory) +{ + u32 *dma_buf; + dma_addr_t dma_phys; + struct dma_chan *dma_chan; + + if (dma_to_memory) { + dma_buf = tspi->rx_dma_buf; + dma_chan = tspi->rx_dma_chan; + dma_phys = tspi->rx_dma_phys; + tspi->rx_dma_chan = NULL; + tspi->rx_dma_buf = NULL; + } else { + dma_buf = tspi->tx_dma_buf; + dma_chan = tspi->tx_dma_chan; + dma_phys = tspi->tx_dma_phys; + tspi->tx_dma_buf = NULL; + tspi->tx_dma_chan = NULL; + } + if (!dma_chan) + return; + + dma_free_coherent(tspi->dev, tspi->dma_buf_size, dma_buf, dma_phys); + dma_release_channel(dma_chan); +} + +static int tegra_spi_set_hw_cs_timing(struct spi_device *spi, + struct spi_delay *setup, + struct spi_delay *hold, + struct spi_delay *inactive) +{ + struct tegra_spi_data *tspi = spi_master_get_devdata(spi->master); + u8 setup_dly, hold_dly, inactive_dly; + u32 setup_hold; + u32 spi_cs_timing; + u32 inactive_cycles; + u8 cs_state; + + if ((setup && setup->unit != SPI_DELAY_UNIT_SCK) || + (hold && hold->unit != SPI_DELAY_UNIT_SCK) || + (inactive && inactive->unit != SPI_DELAY_UNIT_SCK)) { + dev_err(&spi->dev, + "Invalid delay unit %d, should be SPI_DELAY_UNIT_SCK\n", + SPI_DELAY_UNIT_SCK); + return -EINVAL; + } + + setup_dly = setup ? setup->value : 0; + hold_dly = hold ? hold->value : 0; + inactive_dly = inactive ? inactive->value : 0; + + setup_dly = min_t(u8, setup_dly, MAX_SETUP_HOLD_CYCLES); + hold_dly = min_t(u8, hold_dly, MAX_SETUP_HOLD_CYCLES); + if (setup_dly && hold_dly) { + setup_hold = SPI_SETUP_HOLD(setup_dly - 1, hold_dly - 1); + spi_cs_timing = SPI_CS_SETUP_HOLD(tspi->spi_cs_timing1, + spi->chip_select, + setup_hold); + if (tspi->spi_cs_timing1 != spi_cs_timing) { + tspi->spi_cs_timing1 = spi_cs_timing; + tegra_spi_writel(tspi, spi_cs_timing, SPI_CS_TIMING1); + } + } + + inactive_cycles = min_t(u8, inactive_dly, MAX_INACTIVE_CYCLES); + if (inactive_cycles) + inactive_cycles--; + cs_state = inactive_cycles ? 0 : 1; + spi_cs_timing = tspi->spi_cs_timing2; + SPI_SET_CS_ACTIVE_BETWEEN_PACKETS(spi_cs_timing, spi->chip_select, + cs_state); + SPI_SET_CYCLES_BETWEEN_PACKETS(spi_cs_timing, spi->chip_select, + inactive_cycles); + if (tspi->spi_cs_timing2 != spi_cs_timing) { + tspi->spi_cs_timing2 = spi_cs_timing; + tegra_spi_writel(tspi, spi_cs_timing, SPI_CS_TIMING2); + } + + return 0; +} + +static u32 tegra_spi_setup_transfer_one(struct spi_device *spi, + struct spi_transfer *t, + bool is_first_of_msg, + bool is_single_xfer) +{ + struct tegra_spi_data *tspi = spi_master_get_devdata(spi->master); + struct tegra_spi_client_data *cdata = spi->controller_data; + u32 speed = t->speed_hz; + u8 bits_per_word = t->bits_per_word; + u32 command1, command2; + int req_mode; + u32 tx_tap = 0, rx_tap = 0; + + if (speed != tspi->cur_speed) { + clk_set_rate(tspi->clk, speed); + tspi->cur_speed = speed; + } + + tspi->cur_spi = spi; + tspi->cur_pos = 0; + tspi->cur_rx_pos = 0; + tspi->cur_tx_pos = 0; + tspi->curr_xfer = t; + + if (is_first_of_msg) { + tegra_spi_clear_status(tspi); + + command1 = tspi->def_command1_reg; + command1 |= SPI_BIT_LENGTH(bits_per_word - 1); + + command1 &= ~SPI_CONTROL_MODE_MASK; + req_mode = spi->mode & 0x3; + if (req_mode == SPI_MODE_0) + command1 |= SPI_CONTROL_MODE_0; + else if (req_mode == SPI_MODE_1) + command1 |= SPI_CONTROL_MODE_1; + else if (req_mode == SPI_MODE_2) + command1 |= SPI_CONTROL_MODE_2; + else if (req_mode == SPI_MODE_3) + command1 |= SPI_CONTROL_MODE_3; + + if (spi->mode & SPI_LSB_FIRST) + command1 |= SPI_LSBIT_FE; + else + command1 &= ~SPI_LSBIT_FE; + + if (spi->mode & SPI_3WIRE) + command1 |= SPI_BIDIROE; + else + command1 &= ~SPI_BIDIROE; + + if (tspi->cs_control) { + if (tspi->cs_control != spi) + tegra_spi_writel(tspi, command1, SPI_COMMAND1); + tspi->cs_control = NULL; + } else + tegra_spi_writel(tspi, command1, SPI_COMMAND1); + + /* GPIO based chip select control */ + if (spi->cs_gpiod) + gpiod_set_value(spi->cs_gpiod, 1); + + if (is_single_xfer && !(t->cs_change)) { + tspi->use_hw_based_cs = true; + command1 &= ~(SPI_CS_SW_HW | SPI_CS_SW_VAL); + } else { + tspi->use_hw_based_cs = false; + command1 |= SPI_CS_SW_HW; + if (spi->mode & SPI_CS_HIGH) + command1 |= SPI_CS_SW_VAL; + else + command1 &= ~SPI_CS_SW_VAL; + } + + if (tspi->last_used_cs != spi->chip_select) { + if (cdata && cdata->tx_clk_tap_delay) + tx_tap = cdata->tx_clk_tap_delay; + if (cdata && cdata->rx_clk_tap_delay) + rx_tap = cdata->rx_clk_tap_delay; + command2 = SPI_TX_TAP_DELAY(tx_tap) | + SPI_RX_TAP_DELAY(rx_tap); + if (command2 != tspi->def_command2_reg) + tegra_spi_writel(tspi, command2, SPI_COMMAND2); + tspi->last_used_cs = spi->chip_select; + } + + } else { + command1 = tspi->command1_reg; + command1 &= ~SPI_BIT_LENGTH(~0); + command1 |= SPI_BIT_LENGTH(bits_per_word - 1); + } + + return command1; +} + +static int tegra_spi_start_transfer_one(struct spi_device *spi, + struct spi_transfer *t, u32 command1) +{ + struct tegra_spi_data *tspi = spi_master_get_devdata(spi->master); + unsigned total_fifo_words; + int ret; + + total_fifo_words = tegra_spi_calculate_curr_xfer_param(spi, tspi, t); + + if (t->rx_nbits == SPI_NBITS_DUAL || t->tx_nbits == SPI_NBITS_DUAL) + command1 |= SPI_BOTH_EN_BIT; + else + command1 &= ~SPI_BOTH_EN_BIT; + + if (tspi->is_packed) + command1 |= SPI_PACKED; + else + command1 &= ~SPI_PACKED; + + command1 &= ~(SPI_CS_SEL_MASK | SPI_TX_EN | SPI_RX_EN); + tspi->cur_direction = 0; + if (t->rx_buf) { + command1 |= SPI_RX_EN; + tspi->cur_direction |= DATA_DIR_RX; + } + if (t->tx_buf) { + command1 |= SPI_TX_EN; + tspi->cur_direction |= DATA_DIR_TX; + } + command1 |= SPI_CS_SEL(spi->chip_select); + tegra_spi_writel(tspi, command1, SPI_COMMAND1); + tspi->command1_reg = command1; + + dev_dbg(tspi->dev, "The def 0x%x and written 0x%x\n", + tspi->def_command1_reg, (unsigned)command1); + + ret = tegra_spi_flush_fifos(tspi); + if (ret < 0) + return ret; + if (total_fifo_words > SPI_FIFO_DEPTH) + ret = tegra_spi_start_dma_based_transfer(tspi, t); + else + ret = tegra_spi_start_cpu_based_transfer(tspi, t); + return ret; +} + +static struct tegra_spi_client_data + *tegra_spi_parse_cdata_dt(struct spi_device *spi) +{ + struct tegra_spi_client_data *cdata; + struct device_node *slave_np; + + slave_np = spi->dev.of_node; + if (!slave_np) { + dev_dbg(&spi->dev, "device node not found\n"); + return NULL; + } + + cdata = kzalloc(sizeof(*cdata), GFP_KERNEL); + if (!cdata) + return NULL; + + of_property_read_u32(slave_np, "nvidia,tx-clk-tap-delay", + &cdata->tx_clk_tap_delay); + of_property_read_u32(slave_np, "nvidia,rx-clk-tap-delay", + &cdata->rx_clk_tap_delay); + return cdata; +} + +static void tegra_spi_cleanup(struct spi_device *spi) +{ + struct tegra_spi_client_data *cdata = spi->controller_data; + + spi->controller_data = NULL; + if (spi->dev.of_node) + kfree(cdata); +} + +static int tegra_spi_setup(struct spi_device *spi) +{ + struct tegra_spi_data *tspi = spi_master_get_devdata(spi->master); + struct tegra_spi_client_data *cdata = spi->controller_data; + u32 val; + unsigned long flags; + int ret; + + dev_dbg(&spi->dev, "setup %d bpw, %scpol, %scpha, %dHz\n", + spi->bits_per_word, + spi->mode & SPI_CPOL ? "" : "~", + spi->mode & SPI_CPHA ? "" : "~", + spi->max_speed_hz); + + if (!cdata) { + cdata = tegra_spi_parse_cdata_dt(spi); + spi->controller_data = cdata; + } + + ret = pm_runtime_get_sync(tspi->dev); + if (ret < 0) { + pm_runtime_put_noidle(tspi->dev); + dev_err(tspi->dev, "pm runtime failed, e = %d\n", ret); + if (cdata) + tegra_spi_cleanup(spi); + return ret; + } + + if (tspi->soc_data->has_intr_mask_reg) { + val = tegra_spi_readl(tspi, SPI_INTR_MASK); + val &= ~SPI_INTR_ALL_MASK; + tegra_spi_writel(tspi, val, SPI_INTR_MASK); + } + + spin_lock_irqsave(&tspi->lock, flags); + /* GPIO based chip select control */ + if (spi->cs_gpiod) + gpiod_set_value(spi->cs_gpiod, 0); + + val = tspi->def_command1_reg; + if (spi->mode & SPI_CS_HIGH) + val &= ~SPI_CS_POL_INACTIVE(spi->chip_select); + else + val |= SPI_CS_POL_INACTIVE(spi->chip_select); + tspi->def_command1_reg = val; + tegra_spi_writel(tspi, tspi->def_command1_reg, SPI_COMMAND1); + spin_unlock_irqrestore(&tspi->lock, flags); + + pm_runtime_put(tspi->dev); + return 0; +} + +static void tegra_spi_transfer_end(struct spi_device *spi) +{ + struct tegra_spi_data *tspi = spi_master_get_devdata(spi->master); + int cs_val = (spi->mode & SPI_CS_HIGH) ? 0 : 1; + + /* GPIO based chip select control */ + if (spi->cs_gpiod) + gpiod_set_value(spi->cs_gpiod, 0); + + if (!tspi->use_hw_based_cs) { + if (cs_val) + tspi->command1_reg |= SPI_CS_SW_VAL; + else + tspi->command1_reg &= ~SPI_CS_SW_VAL; + tegra_spi_writel(tspi, tspi->command1_reg, SPI_COMMAND1); + } + + tegra_spi_writel(tspi, tspi->def_command1_reg, SPI_COMMAND1); +} + +static void tegra_spi_dump_regs(struct tegra_spi_data *tspi) +{ + dev_dbg(tspi->dev, "============ SPI REGISTER DUMP ============\n"); + dev_dbg(tspi->dev, "Command1: 0x%08x | Command2: 0x%08x\n", + tegra_spi_readl(tspi, SPI_COMMAND1), + tegra_spi_readl(tspi, SPI_COMMAND2)); + dev_dbg(tspi->dev, "DMA_CTL: 0x%08x | DMA_BLK: 0x%08x\n", + tegra_spi_readl(tspi, SPI_DMA_CTL), + tegra_spi_readl(tspi, SPI_DMA_BLK)); + dev_dbg(tspi->dev, "TRANS_STAT: 0x%08x | FIFO_STATUS: 0x%08x\n", + tegra_spi_readl(tspi, SPI_TRANS_STATUS), + tegra_spi_readl(tspi, SPI_FIFO_STATUS)); +} + +static int tegra_spi_transfer_one_message(struct spi_master *master, + struct spi_message *msg) +{ + bool is_first_msg = true; + struct tegra_spi_data *tspi = spi_master_get_devdata(master); + struct spi_transfer *xfer; + struct spi_device *spi = msg->spi; + int ret; + bool skip = false; + int single_xfer; + + msg->status = 0; + msg->actual_length = 0; + + single_xfer = list_is_singular(&msg->transfers); + list_for_each_entry(xfer, &msg->transfers, transfer_list) { + u32 cmd1; + + reinit_completion(&tspi->xfer_completion); + + cmd1 = tegra_spi_setup_transfer_one(spi, xfer, is_first_msg, + single_xfer); + + if (!xfer->len) { + ret = 0; + skip = true; + goto complete_xfer; + } + + ret = tegra_spi_start_transfer_one(spi, xfer, cmd1); + if (ret < 0) { + dev_err(tspi->dev, + "spi can not start transfer, err %d\n", ret); + goto complete_xfer; + } + + is_first_msg = false; + ret = wait_for_completion_timeout(&tspi->xfer_completion, + SPI_DMA_TIMEOUT); + if (WARN_ON(ret == 0)) { + dev_err(tspi->dev, + "spi transfer timeout, err %d\n", ret); + if (tspi->is_curr_dma_xfer && + (tspi->cur_direction & DATA_DIR_TX)) + dmaengine_terminate_all(tspi->tx_dma_chan); + if (tspi->is_curr_dma_xfer && + (tspi->cur_direction & DATA_DIR_RX)) + dmaengine_terminate_all(tspi->rx_dma_chan); + ret = -EIO; + tegra_spi_dump_regs(tspi); + tegra_spi_flush_fifos(tspi); + reset_control_assert(tspi->rst); + udelay(2); + reset_control_deassert(tspi->rst); + tspi->last_used_cs = master->num_chipselect + 1; + goto complete_xfer; + } + + if (tspi->tx_status || tspi->rx_status) { + dev_err(tspi->dev, "Error in Transfer\n"); + ret = -EIO; + tegra_spi_dump_regs(tspi); + goto complete_xfer; + } + msg->actual_length += xfer->len; + +complete_xfer: + if (ret < 0 || skip) { + tegra_spi_transfer_end(spi); + spi_transfer_delay_exec(xfer); + goto exit; + } else if (list_is_last(&xfer->transfer_list, + &msg->transfers)) { + if (xfer->cs_change) + tspi->cs_control = spi; + else { + tegra_spi_transfer_end(spi); + spi_transfer_delay_exec(xfer); + } + } else if (xfer->cs_change) { + tegra_spi_transfer_end(spi); + spi_transfer_delay_exec(xfer); + } + + } + ret = 0; +exit: + msg->status = ret; + spi_finalize_current_message(master); + return ret; +} + +static irqreturn_t handle_cpu_based_xfer(struct tegra_spi_data *tspi) +{ + struct spi_transfer *t = tspi->curr_xfer; + unsigned long flags; + + spin_lock_irqsave(&tspi->lock, flags); + if (tspi->tx_status || tspi->rx_status) { + dev_err(tspi->dev, "CpuXfer ERROR bit set 0x%x\n", + tspi->status_reg); + dev_err(tspi->dev, "CpuXfer 0x%08x:0x%08x\n", + tspi->command1_reg, tspi->dma_control_reg); + tegra_spi_dump_regs(tspi); + tegra_spi_flush_fifos(tspi); + complete(&tspi->xfer_completion); + spin_unlock_irqrestore(&tspi->lock, flags); + reset_control_assert(tspi->rst); + udelay(2); + reset_control_deassert(tspi->rst); + return IRQ_HANDLED; + } + + if (tspi->cur_direction & DATA_DIR_RX) + tegra_spi_read_rx_fifo_to_client_rxbuf(tspi, t); + + if (tspi->cur_direction & DATA_DIR_TX) + tspi->cur_pos = tspi->cur_tx_pos; + else + tspi->cur_pos = tspi->cur_rx_pos; + + if (tspi->cur_pos == t->len) { + complete(&tspi->xfer_completion); + goto exit; + } + + tegra_spi_calculate_curr_xfer_param(tspi->cur_spi, tspi, t); + tegra_spi_start_cpu_based_transfer(tspi, t); +exit: + spin_unlock_irqrestore(&tspi->lock, flags); + return IRQ_HANDLED; +} + +static irqreturn_t handle_dma_based_xfer(struct tegra_spi_data *tspi) +{ + struct spi_transfer *t = tspi->curr_xfer; + long wait_status; + int err = 0; + unsigned total_fifo_words; + unsigned long flags; + + /* Abort dmas if any error */ + if (tspi->cur_direction & DATA_DIR_TX) { + if (tspi->tx_status) { + dmaengine_terminate_all(tspi->tx_dma_chan); + err += 1; + } else { + wait_status = wait_for_completion_interruptible_timeout( + &tspi->tx_dma_complete, SPI_DMA_TIMEOUT); + if (wait_status <= 0) { + dmaengine_terminate_all(tspi->tx_dma_chan); + dev_err(tspi->dev, "TxDma Xfer failed\n"); + err += 1; + } + } + } + + if (tspi->cur_direction & DATA_DIR_RX) { + if (tspi->rx_status) { + dmaengine_terminate_all(tspi->rx_dma_chan); + err += 2; + } else { + wait_status = wait_for_completion_interruptible_timeout( + &tspi->rx_dma_complete, SPI_DMA_TIMEOUT); + if (wait_status <= 0) { + dmaengine_terminate_all(tspi->rx_dma_chan); + dev_err(tspi->dev, "RxDma Xfer failed\n"); + err += 2; + } + } + } + + spin_lock_irqsave(&tspi->lock, flags); + if (err) { + dev_err(tspi->dev, "DmaXfer: ERROR bit set 0x%x\n", + tspi->status_reg); + dev_err(tspi->dev, "DmaXfer 0x%08x:0x%08x\n", + tspi->command1_reg, tspi->dma_control_reg); + tegra_spi_dump_regs(tspi); + tegra_spi_flush_fifos(tspi); + complete(&tspi->xfer_completion); + spin_unlock_irqrestore(&tspi->lock, flags); + reset_control_assert(tspi->rst); + udelay(2); + reset_control_deassert(tspi->rst); + return IRQ_HANDLED; + } + + if (tspi->cur_direction & DATA_DIR_RX) + tegra_spi_copy_spi_rxbuf_to_client_rxbuf(tspi, t); + + if (tspi->cur_direction & DATA_DIR_TX) + tspi->cur_pos = tspi->cur_tx_pos; + else + tspi->cur_pos = tspi->cur_rx_pos; + + if (tspi->cur_pos == t->len) { + complete(&tspi->xfer_completion); + goto exit; + } + + /* Continue transfer in current message */ + total_fifo_words = tegra_spi_calculate_curr_xfer_param(tspi->cur_spi, + tspi, t); + if (total_fifo_words > SPI_FIFO_DEPTH) + err = tegra_spi_start_dma_based_transfer(tspi, t); + else + err = tegra_spi_start_cpu_based_transfer(tspi, t); + +exit: + spin_unlock_irqrestore(&tspi->lock, flags); + return IRQ_HANDLED; +} + +static irqreturn_t tegra_spi_isr_thread(int irq, void *context_data) +{ + struct tegra_spi_data *tspi = context_data; + + if (!tspi->is_curr_dma_xfer) + return handle_cpu_based_xfer(tspi); + return handle_dma_based_xfer(tspi); +} + +static irqreturn_t tegra_spi_isr(int irq, void *context_data) +{ + struct tegra_spi_data *tspi = context_data; + + tspi->status_reg = tegra_spi_readl(tspi, SPI_FIFO_STATUS); + if (tspi->cur_direction & DATA_DIR_TX) + tspi->tx_status = tspi->status_reg & + (SPI_TX_FIFO_UNF | SPI_TX_FIFO_OVF); + + if (tspi->cur_direction & DATA_DIR_RX) + tspi->rx_status = tspi->status_reg & + (SPI_RX_FIFO_OVF | SPI_RX_FIFO_UNF); + tegra_spi_clear_status(tspi); + + return IRQ_WAKE_THREAD; +} + +static struct tegra_spi_soc_data tegra114_spi_soc_data = { + .has_intr_mask_reg = false, +}; + +static struct tegra_spi_soc_data tegra124_spi_soc_data = { + .has_intr_mask_reg = false, +}; + +static struct tegra_spi_soc_data tegra210_spi_soc_data = { + .has_intr_mask_reg = true, +}; + +static const struct of_device_id tegra_spi_of_match[] = { + { + .compatible = "nvidia,tegra114-spi", + .data = &tegra114_spi_soc_data, + }, { + .compatible = "nvidia,tegra124-spi", + .data = &tegra124_spi_soc_data, + }, { + .compatible = "nvidia,tegra210-spi", + .data = &tegra210_spi_soc_data, + }, + {} +}; +MODULE_DEVICE_TABLE(of, tegra_spi_of_match); + +static int tegra_spi_probe(struct platform_device *pdev) +{ + struct spi_master *master; + struct tegra_spi_data *tspi; + struct resource *r; + int ret, spi_irq; + int bus_num; + + master = spi_alloc_master(&pdev->dev, sizeof(*tspi)); + if (!master) { + dev_err(&pdev->dev, "master allocation failed\n"); + return -ENOMEM; + } + platform_set_drvdata(pdev, master); + tspi = spi_master_get_devdata(master); + + if (of_property_read_u32(pdev->dev.of_node, "spi-max-frequency", + &master->max_speed_hz)) + master->max_speed_hz = 25000000; /* 25MHz */ + + /* the spi->mode bits understood by this driver: */ + master->use_gpio_descriptors = true; + master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH | SPI_LSB_FIRST | + SPI_TX_DUAL | SPI_RX_DUAL | SPI_3WIRE; + master->bits_per_word_mask = SPI_BPW_RANGE_MASK(4, 32); + master->setup = tegra_spi_setup; + master->cleanup = tegra_spi_cleanup; + master->transfer_one_message = tegra_spi_transfer_one_message; + master->set_cs_timing = tegra_spi_set_hw_cs_timing; + master->num_chipselect = MAX_CHIP_SELECT; + master->auto_runtime_pm = true; + bus_num = of_alias_get_id(pdev->dev.of_node, "spi"); + if (bus_num >= 0) + master->bus_num = bus_num; + + tspi->master = master; + tspi->dev = &pdev->dev; + spin_lock_init(&tspi->lock); + + tspi->soc_data = of_device_get_match_data(&pdev->dev); + if (!tspi->soc_data) { + dev_err(&pdev->dev, "unsupported tegra\n"); + ret = -ENODEV; + goto exit_free_master; + } + + r = platform_get_resource(pdev, IORESOURCE_MEM, 0); + tspi->base = devm_ioremap_resource(&pdev->dev, r); + if (IS_ERR(tspi->base)) { + ret = PTR_ERR(tspi->base); + goto exit_free_master; + } + tspi->phys = r->start; + + spi_irq = platform_get_irq(pdev, 0); + if (spi_irq < 0) { + ret = spi_irq; + goto exit_free_master; + } + tspi->irq = spi_irq; + + tspi->clk = devm_clk_get(&pdev->dev, "spi"); + if (IS_ERR(tspi->clk)) { + dev_err(&pdev->dev, "can not get clock\n"); + ret = PTR_ERR(tspi->clk); + goto exit_free_master; + } + + tspi->rst = devm_reset_control_get_exclusive(&pdev->dev, "spi"); + if (IS_ERR(tspi->rst)) { + dev_err(&pdev->dev, "can not get reset\n"); + ret = PTR_ERR(tspi->rst); + goto exit_free_master; + } + + tspi->max_buf_size = SPI_FIFO_DEPTH << 2; + tspi->dma_buf_size = DEFAULT_SPI_DMA_BUF_LEN; + + ret = tegra_spi_init_dma_param(tspi, true); + if (ret < 0) + goto exit_free_master; + ret = tegra_spi_init_dma_param(tspi, false); + if (ret < 0) + goto exit_rx_dma_free; + tspi->max_buf_size = tspi->dma_buf_size; + init_completion(&tspi->tx_dma_complete); + init_completion(&tspi->rx_dma_complete); + + init_completion(&tspi->xfer_completion); + + pm_runtime_enable(&pdev->dev); + if (!pm_runtime_enabled(&pdev->dev)) { + ret = tegra_spi_runtime_resume(&pdev->dev); + if (ret) + goto exit_pm_disable; + } + + ret = pm_runtime_get_sync(&pdev->dev); + if (ret < 0) { + dev_err(&pdev->dev, "pm runtime get failed, e = %d\n", ret); + pm_runtime_put_noidle(&pdev->dev); + goto exit_pm_disable; + } + + reset_control_assert(tspi->rst); + udelay(2); + reset_control_deassert(tspi->rst); + tspi->def_command1_reg = SPI_M_S; + tegra_spi_writel(tspi, tspi->def_command1_reg, SPI_COMMAND1); + tspi->spi_cs_timing1 = tegra_spi_readl(tspi, SPI_CS_TIMING1); + tspi->spi_cs_timing2 = tegra_spi_readl(tspi, SPI_CS_TIMING2); + tspi->def_command2_reg = tegra_spi_readl(tspi, SPI_COMMAND2); + tspi->last_used_cs = master->num_chipselect + 1; + pm_runtime_put(&pdev->dev); + ret = request_threaded_irq(tspi->irq, tegra_spi_isr, + tegra_spi_isr_thread, IRQF_ONESHOT, + dev_name(&pdev->dev), tspi); + if (ret < 0) { + dev_err(&pdev->dev, "Failed to register ISR for IRQ %d\n", + tspi->irq); + goto exit_pm_disable; + } + + master->dev.of_node = pdev->dev.of_node; + ret = devm_spi_register_master(&pdev->dev, master); + if (ret < 0) { + dev_err(&pdev->dev, "can not register to master err %d\n", ret); + goto exit_free_irq; + } + return ret; + +exit_free_irq: + free_irq(spi_irq, tspi); +exit_pm_disable: + pm_runtime_disable(&pdev->dev); + if (!pm_runtime_status_suspended(&pdev->dev)) + tegra_spi_runtime_suspend(&pdev->dev); + tegra_spi_deinit_dma_param(tspi, false); +exit_rx_dma_free: + tegra_spi_deinit_dma_param(tspi, true); +exit_free_master: + spi_master_put(master); + return ret; +} + +static int tegra_spi_remove(struct platform_device *pdev) +{ + struct spi_master *master = platform_get_drvdata(pdev); + struct tegra_spi_data *tspi = spi_master_get_devdata(master); + + free_irq(tspi->irq, tspi); + + if (tspi->tx_dma_chan) + tegra_spi_deinit_dma_param(tspi, false); + + if (tspi->rx_dma_chan) + tegra_spi_deinit_dma_param(tspi, true); + + pm_runtime_disable(&pdev->dev); + if (!pm_runtime_status_suspended(&pdev->dev)) + tegra_spi_runtime_suspend(&pdev->dev); + + return 0; +} + +#ifdef CONFIG_PM_SLEEP +static int tegra_spi_suspend(struct device *dev) +{ + struct spi_master *master = dev_get_drvdata(dev); + + return spi_master_suspend(master); +} + +static int tegra_spi_resume(struct device *dev) +{ + struct spi_master *master = dev_get_drvdata(dev); + struct tegra_spi_data *tspi = spi_master_get_devdata(master); + int ret; + + ret = pm_runtime_get_sync(dev); + if (ret < 0) { + pm_runtime_put_noidle(dev); + dev_err(dev, "pm runtime failed, e = %d\n", ret); + return ret; + } + tegra_spi_writel(tspi, tspi->command1_reg, SPI_COMMAND1); + tegra_spi_writel(tspi, tspi->def_command2_reg, SPI_COMMAND2); + tspi->last_used_cs = master->num_chipselect + 1; + pm_runtime_put(dev); + + return spi_master_resume(master); +} +#endif + +static int tegra_spi_runtime_suspend(struct device *dev) +{ + struct spi_master *master = dev_get_drvdata(dev); + struct tegra_spi_data *tspi = spi_master_get_devdata(master); + + /* Flush all write which are in PPSB queue by reading back */ + tegra_spi_readl(tspi, SPI_COMMAND1); + + clk_disable_unprepare(tspi->clk); + return 0; +} + +static int tegra_spi_runtime_resume(struct device *dev) +{ + struct spi_master *master = dev_get_drvdata(dev); + struct tegra_spi_data *tspi = spi_master_get_devdata(master); + int ret; + + ret = clk_prepare_enable(tspi->clk); + if (ret < 0) { + dev_err(tspi->dev, "clk_prepare failed: %d\n", ret); + return ret; + } + return 0; +} + +static const struct dev_pm_ops tegra_spi_pm_ops = { + SET_RUNTIME_PM_OPS(tegra_spi_runtime_suspend, + tegra_spi_runtime_resume, NULL) + SET_SYSTEM_SLEEP_PM_OPS(tegra_spi_suspend, tegra_spi_resume) +}; +static struct platform_driver tegra_spi_driver = { + .driver = { + .name = "spi-tegra114", + .pm = &tegra_spi_pm_ops, + .of_match_table = tegra_spi_of_match, + }, + .probe = tegra_spi_probe, + .remove = tegra_spi_remove, +}; +module_platform_driver(tegra_spi_driver); + +MODULE_ALIAS("platform:spi-tegra114"); +MODULE_DESCRIPTION("NVIDIA Tegra114 SPI Controller Driver"); +MODULE_AUTHOR("Laxman Dewangan <ldewangan@nvidia.com>"); +MODULE_LICENSE("GPL v2"); diff --git a/drivers/spi/spi-tegra20-sflash.c b/drivers/spi/spi-tegra20-sflash.c new file mode 100644 index 000000000..62e50830b --- /dev/null +++ b/drivers/spi/spi-tegra20-sflash.c @@ -0,0 +1,615 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * SPI driver for Nvidia's Tegra20 Serial Flash Controller. + * + * Copyright (c) 2012, NVIDIA CORPORATION. All rights reserved. + * + * Author: Laxman Dewangan <ldewangan@nvidia.com> + */ + +#include <linux/clk.h> +#include <linux/completion.h> +#include <linux/delay.h> +#include <linux/err.h> +#include <linux/interrupt.h> +#include <linux/io.h> +#include <linux/kernel.h> +#include <linux/kthread.h> +#include <linux/module.h> +#include <linux/platform_device.h> +#include <linux/pm_runtime.h> +#include <linux/of.h> +#include <linux/of_device.h> +#include <linux/reset.h> +#include <linux/spi/spi.h> + +#define SPI_COMMAND 0x000 +#define SPI_GO BIT(30) +#define SPI_M_S BIT(28) +#define SPI_ACTIVE_SCLK_MASK (0x3 << 26) +#define SPI_ACTIVE_SCLK_DRIVE_LOW (0 << 26) +#define SPI_ACTIVE_SCLK_DRIVE_HIGH (1 << 26) +#define SPI_ACTIVE_SCLK_PULL_LOW (2 << 26) +#define SPI_ACTIVE_SCLK_PULL_HIGH (3 << 26) + +#define SPI_CK_SDA_FALLING (1 << 21) +#define SPI_CK_SDA_RISING (0 << 21) +#define SPI_CK_SDA_MASK (1 << 21) +#define SPI_ACTIVE_SDA (0x3 << 18) +#define SPI_ACTIVE_SDA_DRIVE_LOW (0 << 18) +#define SPI_ACTIVE_SDA_DRIVE_HIGH (1 << 18) +#define SPI_ACTIVE_SDA_PULL_LOW (2 << 18) +#define SPI_ACTIVE_SDA_PULL_HIGH (3 << 18) + +#define SPI_CS_POL_INVERT BIT(16) +#define SPI_TX_EN BIT(15) +#define SPI_RX_EN BIT(14) +#define SPI_CS_VAL_HIGH BIT(13) +#define SPI_CS_VAL_LOW 0x0 +#define SPI_CS_SW BIT(12) +#define SPI_CS_HW 0x0 +#define SPI_CS_DELAY_MASK (7 << 9) +#define SPI_CS3_EN BIT(8) +#define SPI_CS2_EN BIT(7) +#define SPI_CS1_EN BIT(6) +#define SPI_CS0_EN BIT(5) + +#define SPI_CS_MASK (SPI_CS3_EN | SPI_CS2_EN | \ + SPI_CS1_EN | SPI_CS0_EN) +#define SPI_BIT_LENGTH(x) (((x) & 0x1f) << 0) + +#define SPI_MODES (SPI_ACTIVE_SCLK_MASK | SPI_CK_SDA_MASK) + +#define SPI_STATUS 0x004 +#define SPI_BSY BIT(31) +#define SPI_RDY BIT(30) +#define SPI_TXF_FLUSH BIT(29) +#define SPI_RXF_FLUSH BIT(28) +#define SPI_RX_UNF BIT(27) +#define SPI_TX_OVF BIT(26) +#define SPI_RXF_EMPTY BIT(25) +#define SPI_RXF_FULL BIT(24) +#define SPI_TXF_EMPTY BIT(23) +#define SPI_TXF_FULL BIT(22) +#define SPI_BLK_CNT(count) (((count) & 0xffff) + 1) + +#define SPI_FIFO_ERROR (SPI_RX_UNF | SPI_TX_OVF) +#define SPI_FIFO_EMPTY (SPI_TX_EMPTY | SPI_RX_EMPTY) + +#define SPI_RX_CMP 0x8 +#define SPI_DMA_CTL 0x0C +#define SPI_DMA_EN BIT(31) +#define SPI_IE_RXC BIT(27) +#define SPI_IE_TXC BIT(26) +#define SPI_PACKED BIT(20) +#define SPI_RX_TRIG_MASK (0x3 << 18) +#define SPI_RX_TRIG_1W (0x0 << 18) +#define SPI_RX_TRIG_4W (0x1 << 18) +#define SPI_TX_TRIG_MASK (0x3 << 16) +#define SPI_TX_TRIG_1W (0x0 << 16) +#define SPI_TX_TRIG_4W (0x1 << 16) +#define SPI_DMA_BLK_COUNT(count) (((count) - 1) & 0xFFFF) + +#define SPI_TX_FIFO 0x10 +#define SPI_RX_FIFO 0x20 + +#define DATA_DIR_TX (1 << 0) +#define DATA_DIR_RX (1 << 1) + +#define MAX_CHIP_SELECT 4 +#define SPI_FIFO_DEPTH 4 +#define SPI_DMA_TIMEOUT (msecs_to_jiffies(1000)) + +struct tegra_sflash_data { + struct device *dev; + struct spi_master *master; + spinlock_t lock; + + struct clk *clk; + struct reset_control *rst; + void __iomem *base; + unsigned irq; + u32 cur_speed; + + struct spi_device *cur_spi; + unsigned cur_pos; + unsigned cur_len; + unsigned bytes_per_word; + unsigned cur_direction; + unsigned curr_xfer_words; + + unsigned cur_rx_pos; + unsigned cur_tx_pos; + + u32 tx_status; + u32 rx_status; + u32 status_reg; + + u32 def_command_reg; + u32 command_reg; + u32 dma_control_reg; + + struct completion xfer_completion; + struct spi_transfer *curr_xfer; +}; + +static int tegra_sflash_runtime_suspend(struct device *dev); +static int tegra_sflash_runtime_resume(struct device *dev); + +static inline u32 tegra_sflash_readl(struct tegra_sflash_data *tsd, + unsigned long reg) +{ + return readl(tsd->base + reg); +} + +static inline void tegra_sflash_writel(struct tegra_sflash_data *tsd, + u32 val, unsigned long reg) +{ + writel(val, tsd->base + reg); +} + +static void tegra_sflash_clear_status(struct tegra_sflash_data *tsd) +{ + /* Write 1 to clear status register */ + tegra_sflash_writel(tsd, SPI_RDY | SPI_FIFO_ERROR, SPI_STATUS); +} + +static unsigned tegra_sflash_calculate_curr_xfer_param( + struct spi_device *spi, struct tegra_sflash_data *tsd, + struct spi_transfer *t) +{ + unsigned remain_len = t->len - tsd->cur_pos; + unsigned max_word; + + tsd->bytes_per_word = DIV_ROUND_UP(t->bits_per_word, 8); + max_word = remain_len / tsd->bytes_per_word; + if (max_word > SPI_FIFO_DEPTH) + max_word = SPI_FIFO_DEPTH; + tsd->curr_xfer_words = max_word; + return max_word; +} + +static unsigned tegra_sflash_fill_tx_fifo_from_client_txbuf( + struct tegra_sflash_data *tsd, struct spi_transfer *t) +{ + unsigned nbytes; + u32 status; + unsigned max_n_32bit = tsd->curr_xfer_words; + u8 *tx_buf = (u8 *)t->tx_buf + tsd->cur_tx_pos; + + if (max_n_32bit > SPI_FIFO_DEPTH) + max_n_32bit = SPI_FIFO_DEPTH; + nbytes = max_n_32bit * tsd->bytes_per_word; + + status = tegra_sflash_readl(tsd, SPI_STATUS); + while (!(status & SPI_TXF_FULL)) { + int i; + u32 x = 0; + + for (i = 0; nbytes && (i < tsd->bytes_per_word); + i++, nbytes--) + x |= (u32)(*tx_buf++) << (i * 8); + tegra_sflash_writel(tsd, x, SPI_TX_FIFO); + if (!nbytes) + break; + + status = tegra_sflash_readl(tsd, SPI_STATUS); + } + tsd->cur_tx_pos += max_n_32bit * tsd->bytes_per_word; + return max_n_32bit; +} + +static int tegra_sflash_read_rx_fifo_to_client_rxbuf( + struct tegra_sflash_data *tsd, struct spi_transfer *t) +{ + u32 status; + unsigned int read_words = 0; + u8 *rx_buf = (u8 *)t->rx_buf + tsd->cur_rx_pos; + + status = tegra_sflash_readl(tsd, SPI_STATUS); + while (!(status & SPI_RXF_EMPTY)) { + int i; + u32 x = tegra_sflash_readl(tsd, SPI_RX_FIFO); + + for (i = 0; (i < tsd->bytes_per_word); i++) + *rx_buf++ = (x >> (i*8)) & 0xFF; + read_words++; + status = tegra_sflash_readl(tsd, SPI_STATUS); + } + tsd->cur_rx_pos += read_words * tsd->bytes_per_word; + return 0; +} + +static int tegra_sflash_start_cpu_based_transfer( + struct tegra_sflash_data *tsd, struct spi_transfer *t) +{ + u32 val = 0; + unsigned cur_words; + + if (tsd->cur_direction & DATA_DIR_TX) + val |= SPI_IE_TXC; + + if (tsd->cur_direction & DATA_DIR_RX) + val |= SPI_IE_RXC; + + tegra_sflash_writel(tsd, val, SPI_DMA_CTL); + tsd->dma_control_reg = val; + + if (tsd->cur_direction & DATA_DIR_TX) + cur_words = tegra_sflash_fill_tx_fifo_from_client_txbuf(tsd, t); + else + cur_words = tsd->curr_xfer_words; + val |= SPI_DMA_BLK_COUNT(cur_words); + tegra_sflash_writel(tsd, val, SPI_DMA_CTL); + tsd->dma_control_reg = val; + val |= SPI_DMA_EN; + tegra_sflash_writel(tsd, val, SPI_DMA_CTL); + return 0; +} + +static int tegra_sflash_start_transfer_one(struct spi_device *spi, + struct spi_transfer *t, bool is_first_of_msg, + bool is_single_xfer) +{ + struct tegra_sflash_data *tsd = spi_master_get_devdata(spi->master); + u32 speed; + u32 command; + + speed = t->speed_hz; + if (speed != tsd->cur_speed) { + clk_set_rate(tsd->clk, speed); + tsd->cur_speed = speed; + } + + tsd->cur_spi = spi; + tsd->cur_pos = 0; + tsd->cur_rx_pos = 0; + tsd->cur_tx_pos = 0; + tsd->curr_xfer = t; + tegra_sflash_calculate_curr_xfer_param(spi, tsd, t); + if (is_first_of_msg) { + command = tsd->def_command_reg; + command |= SPI_BIT_LENGTH(t->bits_per_word - 1); + command |= SPI_CS_VAL_HIGH; + + command &= ~SPI_MODES; + if (spi->mode & SPI_CPHA) + command |= SPI_CK_SDA_FALLING; + + if (spi->mode & SPI_CPOL) + command |= SPI_ACTIVE_SCLK_DRIVE_HIGH; + else + command |= SPI_ACTIVE_SCLK_DRIVE_LOW; + command |= SPI_CS0_EN << spi->chip_select; + } else { + command = tsd->command_reg; + command &= ~SPI_BIT_LENGTH(~0); + command |= SPI_BIT_LENGTH(t->bits_per_word - 1); + command &= ~(SPI_RX_EN | SPI_TX_EN); + } + + tsd->cur_direction = 0; + if (t->rx_buf) { + command |= SPI_RX_EN; + tsd->cur_direction |= DATA_DIR_RX; + } + if (t->tx_buf) { + command |= SPI_TX_EN; + tsd->cur_direction |= DATA_DIR_TX; + } + tegra_sflash_writel(tsd, command, SPI_COMMAND); + tsd->command_reg = command; + + return tegra_sflash_start_cpu_based_transfer(tsd, t); +} + +static int tegra_sflash_transfer_one_message(struct spi_master *master, + struct spi_message *msg) +{ + bool is_first_msg = true; + int single_xfer; + struct tegra_sflash_data *tsd = spi_master_get_devdata(master); + struct spi_transfer *xfer; + struct spi_device *spi = msg->spi; + int ret; + + msg->status = 0; + msg->actual_length = 0; + single_xfer = list_is_singular(&msg->transfers); + list_for_each_entry(xfer, &msg->transfers, transfer_list) { + reinit_completion(&tsd->xfer_completion); + ret = tegra_sflash_start_transfer_one(spi, xfer, + is_first_msg, single_xfer); + if (ret < 0) { + dev_err(tsd->dev, + "spi can not start transfer, err %d\n", ret); + goto exit; + } + is_first_msg = false; + ret = wait_for_completion_timeout(&tsd->xfer_completion, + SPI_DMA_TIMEOUT); + if (WARN_ON(ret == 0)) { + dev_err(tsd->dev, + "spi transfer timeout, err %d\n", ret); + ret = -EIO; + goto exit; + } + + if (tsd->tx_status || tsd->rx_status) { + dev_err(tsd->dev, "Error in Transfer\n"); + ret = -EIO; + goto exit; + } + msg->actual_length += xfer->len; + if (xfer->cs_change && + (xfer->delay_usecs || xfer->delay.value)) { + tegra_sflash_writel(tsd, tsd->def_command_reg, + SPI_COMMAND); + spi_transfer_delay_exec(xfer); + } + } + ret = 0; +exit: + tegra_sflash_writel(tsd, tsd->def_command_reg, SPI_COMMAND); + msg->status = ret; + spi_finalize_current_message(master); + return ret; +} + +static irqreturn_t handle_cpu_based_xfer(struct tegra_sflash_data *tsd) +{ + struct spi_transfer *t = tsd->curr_xfer; + + spin_lock(&tsd->lock); + if (tsd->tx_status || tsd->rx_status || (tsd->status_reg & SPI_BSY)) { + dev_err(tsd->dev, + "CpuXfer ERROR bit set 0x%x\n", tsd->status_reg); + dev_err(tsd->dev, + "CpuXfer 0x%08x:0x%08x\n", tsd->command_reg, + tsd->dma_control_reg); + reset_control_assert(tsd->rst); + udelay(2); + reset_control_deassert(tsd->rst); + complete(&tsd->xfer_completion); + goto exit; + } + + if (tsd->cur_direction & DATA_DIR_RX) + tegra_sflash_read_rx_fifo_to_client_rxbuf(tsd, t); + + if (tsd->cur_direction & DATA_DIR_TX) + tsd->cur_pos = tsd->cur_tx_pos; + else + tsd->cur_pos = tsd->cur_rx_pos; + + if (tsd->cur_pos == t->len) { + complete(&tsd->xfer_completion); + goto exit; + } + + tegra_sflash_calculate_curr_xfer_param(tsd->cur_spi, tsd, t); + tegra_sflash_start_cpu_based_transfer(tsd, t); +exit: + spin_unlock(&tsd->lock); + return IRQ_HANDLED; +} + +static irqreturn_t tegra_sflash_isr(int irq, void *context_data) +{ + struct tegra_sflash_data *tsd = context_data; + + tsd->status_reg = tegra_sflash_readl(tsd, SPI_STATUS); + if (tsd->cur_direction & DATA_DIR_TX) + tsd->tx_status = tsd->status_reg & SPI_TX_OVF; + + if (tsd->cur_direction & DATA_DIR_RX) + tsd->rx_status = tsd->status_reg & SPI_RX_UNF; + tegra_sflash_clear_status(tsd); + + return handle_cpu_based_xfer(tsd); +} + +static const struct of_device_id tegra_sflash_of_match[] = { + { .compatible = "nvidia,tegra20-sflash", }, + {} +}; +MODULE_DEVICE_TABLE(of, tegra_sflash_of_match); + +static int tegra_sflash_probe(struct platform_device *pdev) +{ + struct spi_master *master; + struct tegra_sflash_data *tsd; + int ret; + const struct of_device_id *match; + + match = of_match_device(tegra_sflash_of_match, &pdev->dev); + if (!match) { + dev_err(&pdev->dev, "Error: No device match found\n"); + return -ENODEV; + } + + master = spi_alloc_master(&pdev->dev, sizeof(*tsd)); + if (!master) { + dev_err(&pdev->dev, "master allocation failed\n"); + return -ENOMEM; + } + + /* the spi->mode bits understood by this driver: */ + master->mode_bits = SPI_CPOL | SPI_CPHA; + master->transfer_one_message = tegra_sflash_transfer_one_message; + master->auto_runtime_pm = true; + master->num_chipselect = MAX_CHIP_SELECT; + + platform_set_drvdata(pdev, master); + tsd = spi_master_get_devdata(master); + tsd->master = master; + tsd->dev = &pdev->dev; + spin_lock_init(&tsd->lock); + + if (of_property_read_u32(tsd->dev->of_node, "spi-max-frequency", + &master->max_speed_hz)) + master->max_speed_hz = 25000000; /* 25MHz */ + + tsd->base = devm_platform_ioremap_resource(pdev, 0); + if (IS_ERR(tsd->base)) { + ret = PTR_ERR(tsd->base); + goto exit_free_master; + } + + ret = platform_get_irq(pdev, 0); + if (ret < 0) + goto exit_free_master; + tsd->irq = ret; + + ret = request_irq(tsd->irq, tegra_sflash_isr, 0, + dev_name(&pdev->dev), tsd); + if (ret < 0) { + dev_err(&pdev->dev, "Failed to register ISR for IRQ %d\n", + tsd->irq); + goto exit_free_master; + } + + tsd->clk = devm_clk_get(&pdev->dev, NULL); + if (IS_ERR(tsd->clk)) { + dev_err(&pdev->dev, "can not get clock\n"); + ret = PTR_ERR(tsd->clk); + goto exit_free_irq; + } + + tsd->rst = devm_reset_control_get_exclusive(&pdev->dev, "spi"); + if (IS_ERR(tsd->rst)) { + dev_err(&pdev->dev, "can not get reset\n"); + ret = PTR_ERR(tsd->rst); + goto exit_free_irq; + } + + init_completion(&tsd->xfer_completion); + pm_runtime_enable(&pdev->dev); + if (!pm_runtime_enabled(&pdev->dev)) { + ret = tegra_sflash_runtime_resume(&pdev->dev); + if (ret) + goto exit_pm_disable; + } + + ret = pm_runtime_get_sync(&pdev->dev); + if (ret < 0) { + dev_err(&pdev->dev, "pm runtime get failed, e = %d\n", ret); + pm_runtime_put_noidle(&pdev->dev); + goto exit_pm_disable; + } + + /* Reset controller */ + reset_control_assert(tsd->rst); + udelay(2); + reset_control_deassert(tsd->rst); + + tsd->def_command_reg = SPI_M_S | SPI_CS_SW; + tegra_sflash_writel(tsd, tsd->def_command_reg, SPI_COMMAND); + pm_runtime_put(&pdev->dev); + + master->dev.of_node = pdev->dev.of_node; + ret = devm_spi_register_master(&pdev->dev, master); + if (ret < 0) { + dev_err(&pdev->dev, "can not register to master err %d\n", ret); + goto exit_pm_disable; + } + return ret; + +exit_pm_disable: + pm_runtime_disable(&pdev->dev); + if (!pm_runtime_status_suspended(&pdev->dev)) + tegra_sflash_runtime_suspend(&pdev->dev); +exit_free_irq: + free_irq(tsd->irq, tsd); +exit_free_master: + spi_master_put(master); + return ret; +} + +static int tegra_sflash_remove(struct platform_device *pdev) +{ + struct spi_master *master = platform_get_drvdata(pdev); + struct tegra_sflash_data *tsd = spi_master_get_devdata(master); + + free_irq(tsd->irq, tsd); + + pm_runtime_disable(&pdev->dev); + if (!pm_runtime_status_suspended(&pdev->dev)) + tegra_sflash_runtime_suspend(&pdev->dev); + + return 0; +} + +#ifdef CONFIG_PM_SLEEP +static int tegra_sflash_suspend(struct device *dev) +{ + struct spi_master *master = dev_get_drvdata(dev); + + return spi_master_suspend(master); +} + +static int tegra_sflash_resume(struct device *dev) +{ + struct spi_master *master = dev_get_drvdata(dev); + struct tegra_sflash_data *tsd = spi_master_get_devdata(master); + int ret; + + ret = pm_runtime_get_sync(dev); + if (ret < 0) { + pm_runtime_put_noidle(dev); + dev_err(dev, "pm runtime failed, e = %d\n", ret); + return ret; + } + tegra_sflash_writel(tsd, tsd->command_reg, SPI_COMMAND); + pm_runtime_put(dev); + + return spi_master_resume(master); +} +#endif + +static int tegra_sflash_runtime_suspend(struct device *dev) +{ + struct spi_master *master = dev_get_drvdata(dev); + struct tegra_sflash_data *tsd = spi_master_get_devdata(master); + + /* Flush all write which are in PPSB queue by reading back */ + tegra_sflash_readl(tsd, SPI_COMMAND); + + clk_disable_unprepare(tsd->clk); + return 0; +} + +static int tegra_sflash_runtime_resume(struct device *dev) +{ + struct spi_master *master = dev_get_drvdata(dev); + struct tegra_sflash_data *tsd = spi_master_get_devdata(master); + int ret; + + ret = clk_prepare_enable(tsd->clk); + if (ret < 0) { + dev_err(tsd->dev, "clk_prepare failed: %d\n", ret); + return ret; + } + return 0; +} + +static const struct dev_pm_ops slink_pm_ops = { + SET_RUNTIME_PM_OPS(tegra_sflash_runtime_suspend, + tegra_sflash_runtime_resume, NULL) + SET_SYSTEM_SLEEP_PM_OPS(tegra_sflash_suspend, tegra_sflash_resume) +}; +static struct platform_driver tegra_sflash_driver = { + .driver = { + .name = "spi-tegra-sflash", + .pm = &slink_pm_ops, + .of_match_table = tegra_sflash_of_match, + }, + .probe = tegra_sflash_probe, + .remove = tegra_sflash_remove, +}; +module_platform_driver(tegra_sflash_driver); + +MODULE_ALIAS("platform:spi-tegra-sflash"); +MODULE_DESCRIPTION("NVIDIA Tegra20 Serial Flash Controller Driver"); +MODULE_AUTHOR("Laxman Dewangan <ldewangan@nvidia.com>"); +MODULE_LICENSE("GPL v2"); diff --git a/drivers/spi/spi-tegra20-slink.c b/drivers/spi/spi-tegra20-slink.c new file mode 100644 index 000000000..9e2b812b9 --- /dev/null +++ b/drivers/spi/spi-tegra20-slink.c @@ -0,0 +1,1243 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * SPI driver for Nvidia's Tegra20/Tegra30 SLINK Controller. + * + * Copyright (c) 2012, NVIDIA CORPORATION. All rights reserved. + */ + +#include <linux/clk.h> +#include <linux/completion.h> +#include <linux/delay.h> +#include <linux/dmaengine.h> +#include <linux/dma-mapping.h> +#include <linux/dmapool.h> +#include <linux/err.h> +#include <linux/interrupt.h> +#include <linux/io.h> +#include <linux/kernel.h> +#include <linux/kthread.h> +#include <linux/module.h> +#include <linux/platform_device.h> +#include <linux/pm_runtime.h> +#include <linux/of.h> +#include <linux/of_device.h> +#include <linux/reset.h> +#include <linux/spi/spi.h> + +#define SLINK_COMMAND 0x000 +#define SLINK_BIT_LENGTH(x) (((x) & 0x1f) << 0) +#define SLINK_WORD_SIZE(x) (((x) & 0x1f) << 5) +#define SLINK_BOTH_EN (1 << 10) +#define SLINK_CS_SW (1 << 11) +#define SLINK_CS_VALUE (1 << 12) +#define SLINK_CS_POLARITY (1 << 13) +#define SLINK_IDLE_SDA_DRIVE_LOW (0 << 16) +#define SLINK_IDLE_SDA_DRIVE_HIGH (1 << 16) +#define SLINK_IDLE_SDA_PULL_LOW (2 << 16) +#define SLINK_IDLE_SDA_PULL_HIGH (3 << 16) +#define SLINK_IDLE_SDA_MASK (3 << 16) +#define SLINK_CS_POLARITY1 (1 << 20) +#define SLINK_CK_SDA (1 << 21) +#define SLINK_CS_POLARITY2 (1 << 22) +#define SLINK_CS_POLARITY3 (1 << 23) +#define SLINK_IDLE_SCLK_DRIVE_LOW (0 << 24) +#define SLINK_IDLE_SCLK_DRIVE_HIGH (1 << 24) +#define SLINK_IDLE_SCLK_PULL_LOW (2 << 24) +#define SLINK_IDLE_SCLK_PULL_HIGH (3 << 24) +#define SLINK_IDLE_SCLK_MASK (3 << 24) +#define SLINK_M_S (1 << 28) +#define SLINK_WAIT (1 << 29) +#define SLINK_GO (1 << 30) +#define SLINK_ENB (1 << 31) + +#define SLINK_MODES (SLINK_IDLE_SCLK_MASK | SLINK_CK_SDA) + +#define SLINK_COMMAND2 0x004 +#define SLINK_LSBFE (1 << 0) +#define SLINK_SSOE (1 << 1) +#define SLINK_SPIE (1 << 4) +#define SLINK_BIDIROE (1 << 6) +#define SLINK_MODFEN (1 << 7) +#define SLINK_INT_SIZE(x) (((x) & 0x1f) << 8) +#define SLINK_CS_ACTIVE_BETWEEN (1 << 17) +#define SLINK_SS_EN_CS(x) (((x) & 0x3) << 18) +#define SLINK_SS_SETUP(x) (((x) & 0x3) << 20) +#define SLINK_FIFO_REFILLS_0 (0 << 22) +#define SLINK_FIFO_REFILLS_1 (1 << 22) +#define SLINK_FIFO_REFILLS_2 (2 << 22) +#define SLINK_FIFO_REFILLS_3 (3 << 22) +#define SLINK_FIFO_REFILLS_MASK (3 << 22) +#define SLINK_WAIT_PACK_INT(x) (((x) & 0x7) << 26) +#define SLINK_SPC0 (1 << 29) +#define SLINK_TXEN (1 << 30) +#define SLINK_RXEN (1 << 31) + +#define SLINK_STATUS 0x008 +#define SLINK_COUNT(val) (((val) >> 0) & 0x1f) +#define SLINK_WORD(val) (((val) >> 5) & 0x1f) +#define SLINK_BLK_CNT(val) (((val) >> 0) & 0xffff) +#define SLINK_MODF (1 << 16) +#define SLINK_RX_UNF (1 << 18) +#define SLINK_TX_OVF (1 << 19) +#define SLINK_TX_FULL (1 << 20) +#define SLINK_TX_EMPTY (1 << 21) +#define SLINK_RX_FULL (1 << 22) +#define SLINK_RX_EMPTY (1 << 23) +#define SLINK_TX_UNF (1 << 24) +#define SLINK_RX_OVF (1 << 25) +#define SLINK_TX_FLUSH (1 << 26) +#define SLINK_RX_FLUSH (1 << 27) +#define SLINK_SCLK (1 << 28) +#define SLINK_ERR (1 << 29) +#define SLINK_RDY (1 << 30) +#define SLINK_BSY (1 << 31) +#define SLINK_FIFO_ERROR (SLINK_TX_OVF | SLINK_RX_UNF | \ + SLINK_TX_UNF | SLINK_RX_OVF) + +#define SLINK_FIFO_EMPTY (SLINK_TX_EMPTY | SLINK_RX_EMPTY) + +#define SLINK_MAS_DATA 0x010 +#define SLINK_SLAVE_DATA 0x014 + +#define SLINK_DMA_CTL 0x018 +#define SLINK_DMA_BLOCK_SIZE(x) (((x) & 0xffff) << 0) +#define SLINK_TX_TRIG_1 (0 << 16) +#define SLINK_TX_TRIG_4 (1 << 16) +#define SLINK_TX_TRIG_8 (2 << 16) +#define SLINK_TX_TRIG_16 (3 << 16) +#define SLINK_TX_TRIG_MASK (3 << 16) +#define SLINK_RX_TRIG_1 (0 << 18) +#define SLINK_RX_TRIG_4 (1 << 18) +#define SLINK_RX_TRIG_8 (2 << 18) +#define SLINK_RX_TRIG_16 (3 << 18) +#define SLINK_RX_TRIG_MASK (3 << 18) +#define SLINK_PACKED (1 << 20) +#define SLINK_PACK_SIZE_4 (0 << 21) +#define SLINK_PACK_SIZE_8 (1 << 21) +#define SLINK_PACK_SIZE_16 (2 << 21) +#define SLINK_PACK_SIZE_32 (3 << 21) +#define SLINK_PACK_SIZE_MASK (3 << 21) +#define SLINK_IE_TXC (1 << 26) +#define SLINK_IE_RXC (1 << 27) +#define SLINK_DMA_EN (1 << 31) + +#define SLINK_STATUS2 0x01c +#define SLINK_TX_FIFO_EMPTY_COUNT(val) (((val) & 0x3f) >> 0) +#define SLINK_RX_FIFO_FULL_COUNT(val) (((val) & 0x3f0000) >> 16) +#define SLINK_SS_HOLD_TIME(val) (((val) & 0xF) << 6) + +#define SLINK_TX_FIFO 0x100 +#define SLINK_RX_FIFO 0x180 + +#define DATA_DIR_TX (1 << 0) +#define DATA_DIR_RX (1 << 1) + +#define SLINK_DMA_TIMEOUT (msecs_to_jiffies(1000)) + +#define DEFAULT_SPI_DMA_BUF_LEN (16*1024) +#define TX_FIFO_EMPTY_COUNT_MAX SLINK_TX_FIFO_EMPTY_COUNT(0x20) +#define RX_FIFO_FULL_COUNT_ZERO SLINK_RX_FIFO_FULL_COUNT(0) + +#define SLINK_STATUS2_RESET \ + (TX_FIFO_EMPTY_COUNT_MAX | RX_FIFO_FULL_COUNT_ZERO << 16) + +#define MAX_CHIP_SELECT 4 +#define SLINK_FIFO_DEPTH 32 + +struct tegra_slink_chip_data { + bool cs_hold_time; +}; + +struct tegra_slink_data { + struct device *dev; + struct spi_master *master; + const struct tegra_slink_chip_data *chip_data; + spinlock_t lock; + + struct clk *clk; + struct reset_control *rst; + void __iomem *base; + phys_addr_t phys; + unsigned irq; + u32 cur_speed; + + struct spi_device *cur_spi; + unsigned cur_pos; + unsigned cur_len; + unsigned words_per_32bit; + unsigned bytes_per_word; + unsigned curr_dma_words; + unsigned cur_direction; + + unsigned cur_rx_pos; + unsigned cur_tx_pos; + + unsigned dma_buf_size; + unsigned max_buf_size; + bool is_curr_dma_xfer; + + struct completion rx_dma_complete; + struct completion tx_dma_complete; + + u32 tx_status; + u32 rx_status; + u32 status_reg; + bool is_packed; + u32 packed_size; + + u32 command_reg; + u32 command2_reg; + u32 dma_control_reg; + u32 def_command_reg; + u32 def_command2_reg; + + struct completion xfer_completion; + struct spi_transfer *curr_xfer; + struct dma_chan *rx_dma_chan; + u32 *rx_dma_buf; + dma_addr_t rx_dma_phys; + struct dma_async_tx_descriptor *rx_dma_desc; + + struct dma_chan *tx_dma_chan; + u32 *tx_dma_buf; + dma_addr_t tx_dma_phys; + struct dma_async_tx_descriptor *tx_dma_desc; +}; + +static int tegra_slink_runtime_suspend(struct device *dev); +static int tegra_slink_runtime_resume(struct device *dev); + +static inline u32 tegra_slink_readl(struct tegra_slink_data *tspi, + unsigned long reg) +{ + return readl(tspi->base + reg); +} + +static inline void tegra_slink_writel(struct tegra_slink_data *tspi, + u32 val, unsigned long reg) +{ + writel(val, tspi->base + reg); + + /* Read back register to make sure that register writes completed */ + if (reg != SLINK_TX_FIFO) + readl(tspi->base + SLINK_MAS_DATA); +} + +static void tegra_slink_clear_status(struct tegra_slink_data *tspi) +{ + u32 val_write; + + tegra_slink_readl(tspi, SLINK_STATUS); + + /* Write 1 to clear status register */ + val_write = SLINK_RDY | SLINK_FIFO_ERROR; + tegra_slink_writel(tspi, val_write, SLINK_STATUS); +} + +static u32 tegra_slink_get_packed_size(struct tegra_slink_data *tspi, + struct spi_transfer *t) +{ + switch (tspi->bytes_per_word) { + case 0: + return SLINK_PACK_SIZE_4; + case 1: + return SLINK_PACK_SIZE_8; + case 2: + return SLINK_PACK_SIZE_16; + case 4: + return SLINK_PACK_SIZE_32; + default: + return 0; + } +} + +static unsigned tegra_slink_calculate_curr_xfer_param( + struct spi_device *spi, struct tegra_slink_data *tspi, + struct spi_transfer *t) +{ + unsigned remain_len = t->len - tspi->cur_pos; + unsigned max_word; + unsigned bits_per_word; + unsigned max_len; + unsigned total_fifo_words; + + bits_per_word = t->bits_per_word; + tspi->bytes_per_word = DIV_ROUND_UP(bits_per_word, 8); + + if (bits_per_word == 8 || bits_per_word == 16) { + tspi->is_packed = true; + tspi->words_per_32bit = 32/bits_per_word; + } else { + tspi->is_packed = false; + tspi->words_per_32bit = 1; + } + tspi->packed_size = tegra_slink_get_packed_size(tspi, t); + + if (tspi->is_packed) { + max_len = min(remain_len, tspi->max_buf_size); + tspi->curr_dma_words = max_len/tspi->bytes_per_word; + total_fifo_words = max_len/4; + } else { + max_word = (remain_len - 1) / tspi->bytes_per_word + 1; + max_word = min(max_word, tspi->max_buf_size/4); + tspi->curr_dma_words = max_word; + total_fifo_words = max_word; + } + return total_fifo_words; +} + +static unsigned tegra_slink_fill_tx_fifo_from_client_txbuf( + struct tegra_slink_data *tspi, struct spi_transfer *t) +{ + unsigned nbytes; + unsigned tx_empty_count; + u32 fifo_status; + unsigned max_n_32bit; + unsigned i, count; + unsigned int written_words; + unsigned fifo_words_left; + u8 *tx_buf = (u8 *)t->tx_buf + tspi->cur_tx_pos; + + fifo_status = tegra_slink_readl(tspi, SLINK_STATUS2); + tx_empty_count = SLINK_TX_FIFO_EMPTY_COUNT(fifo_status); + + if (tspi->is_packed) { + fifo_words_left = tx_empty_count * tspi->words_per_32bit; + written_words = min(fifo_words_left, tspi->curr_dma_words); + nbytes = written_words * tspi->bytes_per_word; + max_n_32bit = DIV_ROUND_UP(nbytes, 4); + for (count = 0; count < max_n_32bit; count++) { + u32 x = 0; + for (i = 0; (i < 4) && nbytes; i++, nbytes--) + x |= (u32)(*tx_buf++) << (i * 8); + tegra_slink_writel(tspi, x, SLINK_TX_FIFO); + } + } else { + max_n_32bit = min(tspi->curr_dma_words, tx_empty_count); + written_words = max_n_32bit; + nbytes = written_words * tspi->bytes_per_word; + for (count = 0; count < max_n_32bit; count++) { + u32 x = 0; + for (i = 0; nbytes && (i < tspi->bytes_per_word); + i++, nbytes--) + x |= (u32)(*tx_buf++) << (i * 8); + tegra_slink_writel(tspi, x, SLINK_TX_FIFO); + } + } + tspi->cur_tx_pos += written_words * tspi->bytes_per_word; + return written_words; +} + +static unsigned int tegra_slink_read_rx_fifo_to_client_rxbuf( + struct tegra_slink_data *tspi, struct spi_transfer *t) +{ + unsigned rx_full_count; + u32 fifo_status; + unsigned i, count; + unsigned int read_words = 0; + unsigned len; + u8 *rx_buf = (u8 *)t->rx_buf + tspi->cur_rx_pos; + + fifo_status = tegra_slink_readl(tspi, SLINK_STATUS2); + rx_full_count = SLINK_RX_FIFO_FULL_COUNT(fifo_status); + if (tspi->is_packed) { + len = tspi->curr_dma_words * tspi->bytes_per_word; + for (count = 0; count < rx_full_count; count++) { + u32 x = tegra_slink_readl(tspi, SLINK_RX_FIFO); + for (i = 0; len && (i < 4); i++, len--) + *rx_buf++ = (x >> i*8) & 0xFF; + } + tspi->cur_rx_pos += tspi->curr_dma_words * tspi->bytes_per_word; + read_words += tspi->curr_dma_words; + } else { + for (count = 0; count < rx_full_count; count++) { + u32 x = tegra_slink_readl(tspi, SLINK_RX_FIFO); + for (i = 0; (i < tspi->bytes_per_word); i++) + *rx_buf++ = (x >> (i*8)) & 0xFF; + } + tspi->cur_rx_pos += rx_full_count * tspi->bytes_per_word; + read_words += rx_full_count; + } + return read_words; +} + +static void tegra_slink_copy_client_txbuf_to_spi_txbuf( + struct tegra_slink_data *tspi, struct spi_transfer *t) +{ + /* Make the dma buffer to read by cpu */ + dma_sync_single_for_cpu(tspi->dev, tspi->tx_dma_phys, + tspi->dma_buf_size, DMA_TO_DEVICE); + + if (tspi->is_packed) { + unsigned len = tspi->curr_dma_words * tspi->bytes_per_word; + memcpy(tspi->tx_dma_buf, t->tx_buf + tspi->cur_pos, len); + } else { + unsigned int i; + unsigned int count; + u8 *tx_buf = (u8 *)t->tx_buf + tspi->cur_tx_pos; + unsigned consume = tspi->curr_dma_words * tspi->bytes_per_word; + + for (count = 0; count < tspi->curr_dma_words; count++) { + u32 x = 0; + for (i = 0; consume && (i < tspi->bytes_per_word); + i++, consume--) + x |= (u32)(*tx_buf++) << (i * 8); + tspi->tx_dma_buf[count] = x; + } + } + tspi->cur_tx_pos += tspi->curr_dma_words * tspi->bytes_per_word; + + /* Make the dma buffer to read by dma */ + dma_sync_single_for_device(tspi->dev, tspi->tx_dma_phys, + tspi->dma_buf_size, DMA_TO_DEVICE); +} + +static void tegra_slink_copy_spi_rxbuf_to_client_rxbuf( + struct tegra_slink_data *tspi, struct spi_transfer *t) +{ + unsigned len; + + /* Make the dma buffer to read by cpu */ + dma_sync_single_for_cpu(tspi->dev, tspi->rx_dma_phys, + tspi->dma_buf_size, DMA_FROM_DEVICE); + + if (tspi->is_packed) { + len = tspi->curr_dma_words * tspi->bytes_per_word; + memcpy(t->rx_buf + tspi->cur_rx_pos, tspi->rx_dma_buf, len); + } else { + unsigned int i; + unsigned int count; + unsigned char *rx_buf = t->rx_buf + tspi->cur_rx_pos; + u32 rx_mask = ((u32)1 << t->bits_per_word) - 1; + + for (count = 0; count < tspi->curr_dma_words; count++) { + u32 x = tspi->rx_dma_buf[count] & rx_mask; + for (i = 0; (i < tspi->bytes_per_word); i++) + *rx_buf++ = (x >> (i*8)) & 0xFF; + } + } + tspi->cur_rx_pos += tspi->curr_dma_words * tspi->bytes_per_word; + + /* Make the dma buffer to read by dma */ + dma_sync_single_for_device(tspi->dev, tspi->rx_dma_phys, + tspi->dma_buf_size, DMA_FROM_DEVICE); +} + +static void tegra_slink_dma_complete(void *args) +{ + struct completion *dma_complete = args; + + complete(dma_complete); +} + +static int tegra_slink_start_tx_dma(struct tegra_slink_data *tspi, int len) +{ + reinit_completion(&tspi->tx_dma_complete); + tspi->tx_dma_desc = dmaengine_prep_slave_single(tspi->tx_dma_chan, + tspi->tx_dma_phys, len, DMA_MEM_TO_DEV, + DMA_PREP_INTERRUPT | DMA_CTRL_ACK); + if (!tspi->tx_dma_desc) { + dev_err(tspi->dev, "Not able to get desc for Tx\n"); + return -EIO; + } + + tspi->tx_dma_desc->callback = tegra_slink_dma_complete; + tspi->tx_dma_desc->callback_param = &tspi->tx_dma_complete; + + dmaengine_submit(tspi->tx_dma_desc); + dma_async_issue_pending(tspi->tx_dma_chan); + return 0; +} + +static int tegra_slink_start_rx_dma(struct tegra_slink_data *tspi, int len) +{ + reinit_completion(&tspi->rx_dma_complete); + tspi->rx_dma_desc = dmaengine_prep_slave_single(tspi->rx_dma_chan, + tspi->rx_dma_phys, len, DMA_DEV_TO_MEM, + DMA_PREP_INTERRUPT | DMA_CTRL_ACK); + if (!tspi->rx_dma_desc) { + dev_err(tspi->dev, "Not able to get desc for Rx\n"); + return -EIO; + } + + tspi->rx_dma_desc->callback = tegra_slink_dma_complete; + tspi->rx_dma_desc->callback_param = &tspi->rx_dma_complete; + + dmaengine_submit(tspi->rx_dma_desc); + dma_async_issue_pending(tspi->rx_dma_chan); + return 0; +} + +static int tegra_slink_start_dma_based_transfer( + struct tegra_slink_data *tspi, struct spi_transfer *t) +{ + u32 val; + unsigned int len; + int ret = 0; + u32 status; + + /* Make sure that Rx and Tx fifo are empty */ + status = tegra_slink_readl(tspi, SLINK_STATUS); + if ((status & SLINK_FIFO_EMPTY) != SLINK_FIFO_EMPTY) { + dev_err(tspi->dev, "Rx/Tx fifo are not empty status 0x%08x\n", + (unsigned)status); + return -EIO; + } + + val = SLINK_DMA_BLOCK_SIZE(tspi->curr_dma_words - 1); + val |= tspi->packed_size; + if (tspi->is_packed) + len = DIV_ROUND_UP(tspi->curr_dma_words * tspi->bytes_per_word, + 4) * 4; + else + len = tspi->curr_dma_words * 4; + + /* Set attention level based on length of transfer */ + if (len & 0xF) + val |= SLINK_TX_TRIG_1 | SLINK_RX_TRIG_1; + else if (((len) >> 4) & 0x1) + val |= SLINK_TX_TRIG_4 | SLINK_RX_TRIG_4; + else + val |= SLINK_TX_TRIG_8 | SLINK_RX_TRIG_8; + + if (tspi->cur_direction & DATA_DIR_TX) + val |= SLINK_IE_TXC; + + if (tspi->cur_direction & DATA_DIR_RX) + val |= SLINK_IE_RXC; + + tegra_slink_writel(tspi, val, SLINK_DMA_CTL); + tspi->dma_control_reg = val; + + if (tspi->cur_direction & DATA_DIR_TX) { + tegra_slink_copy_client_txbuf_to_spi_txbuf(tspi, t); + wmb(); + ret = tegra_slink_start_tx_dma(tspi, len); + if (ret < 0) { + dev_err(tspi->dev, + "Starting tx dma failed, err %d\n", ret); + return ret; + } + + /* Wait for tx fifo to be fill before starting slink */ + status = tegra_slink_readl(tspi, SLINK_STATUS); + while (!(status & SLINK_TX_FULL)) + status = tegra_slink_readl(tspi, SLINK_STATUS); + } + + if (tspi->cur_direction & DATA_DIR_RX) { + /* Make the dma buffer to read by dma */ + dma_sync_single_for_device(tspi->dev, tspi->rx_dma_phys, + tspi->dma_buf_size, DMA_FROM_DEVICE); + + ret = tegra_slink_start_rx_dma(tspi, len); + if (ret < 0) { + dev_err(tspi->dev, + "Starting rx dma failed, err %d\n", ret); + if (tspi->cur_direction & DATA_DIR_TX) + dmaengine_terminate_all(tspi->tx_dma_chan); + return ret; + } + } + tspi->is_curr_dma_xfer = true; + if (tspi->is_packed) { + val |= SLINK_PACKED; + tegra_slink_writel(tspi, val, SLINK_DMA_CTL); + /* HW need small delay after settign Packed mode */ + udelay(1); + } + tspi->dma_control_reg = val; + + val |= SLINK_DMA_EN; + tegra_slink_writel(tspi, val, SLINK_DMA_CTL); + return ret; +} + +static int tegra_slink_start_cpu_based_transfer( + struct tegra_slink_data *tspi, struct spi_transfer *t) +{ + u32 val; + unsigned cur_words; + + val = tspi->packed_size; + if (tspi->cur_direction & DATA_DIR_TX) + val |= SLINK_IE_TXC; + + if (tspi->cur_direction & DATA_DIR_RX) + val |= SLINK_IE_RXC; + + tegra_slink_writel(tspi, val, SLINK_DMA_CTL); + tspi->dma_control_reg = val; + + if (tspi->cur_direction & DATA_DIR_TX) + cur_words = tegra_slink_fill_tx_fifo_from_client_txbuf(tspi, t); + else + cur_words = tspi->curr_dma_words; + val |= SLINK_DMA_BLOCK_SIZE(cur_words - 1); + tegra_slink_writel(tspi, val, SLINK_DMA_CTL); + tspi->dma_control_reg = val; + + tspi->is_curr_dma_xfer = false; + if (tspi->is_packed) { + val |= SLINK_PACKED; + tegra_slink_writel(tspi, val, SLINK_DMA_CTL); + udelay(1); + wmb(); + } + tspi->dma_control_reg = val; + val |= SLINK_DMA_EN; + tegra_slink_writel(tspi, val, SLINK_DMA_CTL); + return 0; +} + +static int tegra_slink_init_dma_param(struct tegra_slink_data *tspi, + bool dma_to_memory) +{ + struct dma_chan *dma_chan; + u32 *dma_buf; + dma_addr_t dma_phys; + int ret; + struct dma_slave_config dma_sconfig; + + dma_chan = dma_request_chan(tspi->dev, dma_to_memory ? "rx" : "tx"); + if (IS_ERR(dma_chan)) + return dev_err_probe(tspi->dev, PTR_ERR(dma_chan), + "Dma channel is not available\n"); + + dma_buf = dma_alloc_coherent(tspi->dev, tspi->dma_buf_size, + &dma_phys, GFP_KERNEL); + if (!dma_buf) { + dev_err(tspi->dev, " Not able to allocate the dma buffer\n"); + dma_release_channel(dma_chan); + return -ENOMEM; + } + + if (dma_to_memory) { + dma_sconfig.src_addr = tspi->phys + SLINK_RX_FIFO; + dma_sconfig.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES; + dma_sconfig.src_maxburst = 0; + } else { + dma_sconfig.dst_addr = tspi->phys + SLINK_TX_FIFO; + dma_sconfig.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES; + dma_sconfig.dst_maxburst = 0; + } + + ret = dmaengine_slave_config(dma_chan, &dma_sconfig); + if (ret) + goto scrub; + if (dma_to_memory) { + tspi->rx_dma_chan = dma_chan; + tspi->rx_dma_buf = dma_buf; + tspi->rx_dma_phys = dma_phys; + } else { + tspi->tx_dma_chan = dma_chan; + tspi->tx_dma_buf = dma_buf; + tspi->tx_dma_phys = dma_phys; + } + return 0; + +scrub: + dma_free_coherent(tspi->dev, tspi->dma_buf_size, dma_buf, dma_phys); + dma_release_channel(dma_chan); + return ret; +} + +static void tegra_slink_deinit_dma_param(struct tegra_slink_data *tspi, + bool dma_to_memory) +{ + u32 *dma_buf; + dma_addr_t dma_phys; + struct dma_chan *dma_chan; + + if (dma_to_memory) { + dma_buf = tspi->rx_dma_buf; + dma_chan = tspi->rx_dma_chan; + dma_phys = tspi->rx_dma_phys; + tspi->rx_dma_chan = NULL; + tspi->rx_dma_buf = NULL; + } else { + dma_buf = tspi->tx_dma_buf; + dma_chan = tspi->tx_dma_chan; + dma_phys = tspi->tx_dma_phys; + tspi->tx_dma_buf = NULL; + tspi->tx_dma_chan = NULL; + } + if (!dma_chan) + return; + + dma_free_coherent(tspi->dev, tspi->dma_buf_size, dma_buf, dma_phys); + dma_release_channel(dma_chan); +} + +static int tegra_slink_start_transfer_one(struct spi_device *spi, + struct spi_transfer *t) +{ + struct tegra_slink_data *tspi = spi_master_get_devdata(spi->master); + u32 speed; + u8 bits_per_word; + unsigned total_fifo_words; + int ret; + u32 command; + u32 command2; + + bits_per_word = t->bits_per_word; + speed = t->speed_hz; + if (speed != tspi->cur_speed) { + clk_set_rate(tspi->clk, speed * 4); + tspi->cur_speed = speed; + } + + tspi->cur_spi = spi; + tspi->cur_pos = 0; + tspi->cur_rx_pos = 0; + tspi->cur_tx_pos = 0; + tspi->curr_xfer = t; + total_fifo_words = tegra_slink_calculate_curr_xfer_param(spi, tspi, t); + + command = tspi->command_reg; + command &= ~SLINK_BIT_LENGTH(~0); + command |= SLINK_BIT_LENGTH(bits_per_word - 1); + + command2 = tspi->command2_reg; + command2 &= ~(SLINK_RXEN | SLINK_TXEN); + + tspi->cur_direction = 0; + if (t->rx_buf) { + command2 |= SLINK_RXEN; + tspi->cur_direction |= DATA_DIR_RX; + } + if (t->tx_buf) { + command2 |= SLINK_TXEN; + tspi->cur_direction |= DATA_DIR_TX; + } + + /* + * Writing to the command2 register bevore the command register prevents + * a spike in chip_select line 0. This selects the chip_select line + * before changing the chip_select value. + */ + tegra_slink_writel(tspi, command2, SLINK_COMMAND2); + tspi->command2_reg = command2; + + tegra_slink_writel(tspi, command, SLINK_COMMAND); + tspi->command_reg = command; + + if (total_fifo_words > SLINK_FIFO_DEPTH) + ret = tegra_slink_start_dma_based_transfer(tspi, t); + else + ret = tegra_slink_start_cpu_based_transfer(tspi, t); + return ret; +} + +static int tegra_slink_setup(struct spi_device *spi) +{ + static const u32 cs_pol_bit[MAX_CHIP_SELECT] = { + SLINK_CS_POLARITY, + SLINK_CS_POLARITY1, + SLINK_CS_POLARITY2, + SLINK_CS_POLARITY3, + }; + + struct tegra_slink_data *tspi = spi_master_get_devdata(spi->master); + u32 val; + unsigned long flags; + int ret; + + dev_dbg(&spi->dev, "setup %d bpw, %scpol, %scpha, %dHz\n", + spi->bits_per_word, + spi->mode & SPI_CPOL ? "" : "~", + spi->mode & SPI_CPHA ? "" : "~", + spi->max_speed_hz); + + ret = pm_runtime_get_sync(tspi->dev); + if (ret < 0) { + pm_runtime_put_noidle(tspi->dev); + dev_err(tspi->dev, "pm runtime failed, e = %d\n", ret); + return ret; + } + + spin_lock_irqsave(&tspi->lock, flags); + val = tspi->def_command_reg; + if (spi->mode & SPI_CS_HIGH) + val |= cs_pol_bit[spi->chip_select]; + else + val &= ~cs_pol_bit[spi->chip_select]; + tspi->def_command_reg = val; + tegra_slink_writel(tspi, tspi->def_command_reg, SLINK_COMMAND); + spin_unlock_irqrestore(&tspi->lock, flags); + + pm_runtime_put(tspi->dev); + return 0; +} + +static int tegra_slink_prepare_message(struct spi_master *master, + struct spi_message *msg) +{ + struct tegra_slink_data *tspi = spi_master_get_devdata(master); + struct spi_device *spi = msg->spi; + + tegra_slink_clear_status(tspi); + + tspi->command_reg = tspi->def_command_reg; + tspi->command_reg |= SLINK_CS_SW | SLINK_CS_VALUE; + + tspi->command2_reg = tspi->def_command2_reg; + tspi->command2_reg |= SLINK_SS_EN_CS(spi->chip_select); + + tspi->command_reg &= ~SLINK_MODES; + if (spi->mode & SPI_CPHA) + tspi->command_reg |= SLINK_CK_SDA; + + if (spi->mode & SPI_CPOL) + tspi->command_reg |= SLINK_IDLE_SCLK_DRIVE_HIGH; + else + tspi->command_reg |= SLINK_IDLE_SCLK_DRIVE_LOW; + + return 0; +} + +static int tegra_slink_transfer_one(struct spi_master *master, + struct spi_device *spi, + struct spi_transfer *xfer) +{ + struct tegra_slink_data *tspi = spi_master_get_devdata(master); + int ret; + + reinit_completion(&tspi->xfer_completion); + ret = tegra_slink_start_transfer_one(spi, xfer); + if (ret < 0) { + dev_err(tspi->dev, + "spi can not start transfer, err %d\n", ret); + return ret; + } + + ret = wait_for_completion_timeout(&tspi->xfer_completion, + SLINK_DMA_TIMEOUT); + if (WARN_ON(ret == 0)) { + dev_err(tspi->dev, + "spi transfer timeout, err %d\n", ret); + return -EIO; + } + + if (tspi->tx_status) + return tspi->tx_status; + if (tspi->rx_status) + return tspi->rx_status; + + return 0; +} + +static int tegra_slink_unprepare_message(struct spi_master *master, + struct spi_message *msg) +{ + struct tegra_slink_data *tspi = spi_master_get_devdata(master); + + tegra_slink_writel(tspi, tspi->def_command_reg, SLINK_COMMAND); + tegra_slink_writel(tspi, tspi->def_command2_reg, SLINK_COMMAND2); + + return 0; +} + +static irqreturn_t handle_cpu_based_xfer(struct tegra_slink_data *tspi) +{ + struct spi_transfer *t = tspi->curr_xfer; + unsigned long flags; + + spin_lock_irqsave(&tspi->lock, flags); + if (tspi->tx_status || tspi->rx_status || + (tspi->status_reg & SLINK_BSY)) { + dev_err(tspi->dev, + "CpuXfer ERROR bit set 0x%x\n", tspi->status_reg); + dev_err(tspi->dev, + "CpuXfer 0x%08x:0x%08x:0x%08x\n", tspi->command_reg, + tspi->command2_reg, tspi->dma_control_reg); + reset_control_assert(tspi->rst); + udelay(2); + reset_control_deassert(tspi->rst); + complete(&tspi->xfer_completion); + goto exit; + } + + if (tspi->cur_direction & DATA_DIR_RX) + tegra_slink_read_rx_fifo_to_client_rxbuf(tspi, t); + + if (tspi->cur_direction & DATA_DIR_TX) + tspi->cur_pos = tspi->cur_tx_pos; + else + tspi->cur_pos = tspi->cur_rx_pos; + + if (tspi->cur_pos == t->len) { + complete(&tspi->xfer_completion); + goto exit; + } + + tegra_slink_calculate_curr_xfer_param(tspi->cur_spi, tspi, t); + tegra_slink_start_cpu_based_transfer(tspi, t); +exit: + spin_unlock_irqrestore(&tspi->lock, flags); + return IRQ_HANDLED; +} + +static irqreturn_t handle_dma_based_xfer(struct tegra_slink_data *tspi) +{ + struct spi_transfer *t = tspi->curr_xfer; + long wait_status; + int err = 0; + unsigned total_fifo_words; + unsigned long flags; + + /* Abort dmas if any error */ + if (tspi->cur_direction & DATA_DIR_TX) { + if (tspi->tx_status) { + dmaengine_terminate_all(tspi->tx_dma_chan); + err += 1; + } else { + wait_status = wait_for_completion_interruptible_timeout( + &tspi->tx_dma_complete, SLINK_DMA_TIMEOUT); + if (wait_status <= 0) { + dmaengine_terminate_all(tspi->tx_dma_chan); + dev_err(tspi->dev, "TxDma Xfer failed\n"); + err += 1; + } + } + } + + if (tspi->cur_direction & DATA_DIR_RX) { + if (tspi->rx_status) { + dmaengine_terminate_all(tspi->rx_dma_chan); + err += 2; + } else { + wait_status = wait_for_completion_interruptible_timeout( + &tspi->rx_dma_complete, SLINK_DMA_TIMEOUT); + if (wait_status <= 0) { + dmaengine_terminate_all(tspi->rx_dma_chan); + dev_err(tspi->dev, "RxDma Xfer failed\n"); + err += 2; + } + } + } + + spin_lock_irqsave(&tspi->lock, flags); + if (err) { + dev_err(tspi->dev, + "DmaXfer: ERROR bit set 0x%x\n", tspi->status_reg); + dev_err(tspi->dev, + "DmaXfer 0x%08x:0x%08x:0x%08x\n", tspi->command_reg, + tspi->command2_reg, tspi->dma_control_reg); + reset_control_assert(tspi->rst); + udelay(2); + reset_control_assert(tspi->rst); + complete(&tspi->xfer_completion); + spin_unlock_irqrestore(&tspi->lock, flags); + return IRQ_HANDLED; + } + + if (tspi->cur_direction & DATA_DIR_RX) + tegra_slink_copy_spi_rxbuf_to_client_rxbuf(tspi, t); + + if (tspi->cur_direction & DATA_DIR_TX) + tspi->cur_pos = tspi->cur_tx_pos; + else + tspi->cur_pos = tspi->cur_rx_pos; + + if (tspi->cur_pos == t->len) { + complete(&tspi->xfer_completion); + goto exit; + } + + /* Continue transfer in current message */ + total_fifo_words = tegra_slink_calculate_curr_xfer_param(tspi->cur_spi, + tspi, t); + if (total_fifo_words > SLINK_FIFO_DEPTH) + err = tegra_slink_start_dma_based_transfer(tspi, t); + else + err = tegra_slink_start_cpu_based_transfer(tspi, t); + +exit: + spin_unlock_irqrestore(&tspi->lock, flags); + return IRQ_HANDLED; +} + +static irqreturn_t tegra_slink_isr_thread(int irq, void *context_data) +{ + struct tegra_slink_data *tspi = context_data; + + if (!tspi->is_curr_dma_xfer) + return handle_cpu_based_xfer(tspi); + return handle_dma_based_xfer(tspi); +} + +static irqreturn_t tegra_slink_isr(int irq, void *context_data) +{ + struct tegra_slink_data *tspi = context_data; + + tspi->status_reg = tegra_slink_readl(tspi, SLINK_STATUS); + if (tspi->cur_direction & DATA_DIR_TX) + tspi->tx_status = tspi->status_reg & + (SLINK_TX_OVF | SLINK_TX_UNF); + + if (tspi->cur_direction & DATA_DIR_RX) + tspi->rx_status = tspi->status_reg & + (SLINK_RX_OVF | SLINK_RX_UNF); + tegra_slink_clear_status(tspi); + + return IRQ_WAKE_THREAD; +} + +static const struct tegra_slink_chip_data tegra30_spi_cdata = { + .cs_hold_time = true, +}; + +static const struct tegra_slink_chip_data tegra20_spi_cdata = { + .cs_hold_time = false, +}; + +static const struct of_device_id tegra_slink_of_match[] = { + { .compatible = "nvidia,tegra30-slink", .data = &tegra30_spi_cdata, }, + { .compatible = "nvidia,tegra20-slink", .data = &tegra20_spi_cdata, }, + {} +}; +MODULE_DEVICE_TABLE(of, tegra_slink_of_match); + +static int tegra_slink_probe(struct platform_device *pdev) +{ + struct spi_master *master; + struct tegra_slink_data *tspi; + struct resource *r; + int ret, spi_irq; + const struct tegra_slink_chip_data *cdata = NULL; + + cdata = of_device_get_match_data(&pdev->dev); + + master = spi_alloc_master(&pdev->dev, sizeof(*tspi)); + if (!master) { + dev_err(&pdev->dev, "master allocation failed\n"); + return -ENOMEM; + } + + /* the spi->mode bits understood by this driver: */ + master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH; + master->setup = tegra_slink_setup; + master->prepare_message = tegra_slink_prepare_message; + master->transfer_one = tegra_slink_transfer_one; + master->unprepare_message = tegra_slink_unprepare_message; + master->auto_runtime_pm = true; + master->num_chipselect = MAX_CHIP_SELECT; + + platform_set_drvdata(pdev, master); + tspi = spi_master_get_devdata(master); + tspi->master = master; + tspi->dev = &pdev->dev; + tspi->chip_data = cdata; + spin_lock_init(&tspi->lock); + + if (of_property_read_u32(tspi->dev->of_node, "spi-max-frequency", + &master->max_speed_hz)) + master->max_speed_hz = 25000000; /* 25MHz */ + + r = platform_get_resource(pdev, IORESOURCE_MEM, 0); + if (!r) { + dev_err(&pdev->dev, "No IO memory resource\n"); + ret = -ENODEV; + goto exit_free_master; + } + tspi->phys = r->start; + tspi->base = devm_ioremap_resource(&pdev->dev, r); + if (IS_ERR(tspi->base)) { + ret = PTR_ERR(tspi->base); + goto exit_free_master; + } + + /* disabled clock may cause interrupt storm upon request */ + tspi->clk = devm_clk_get(&pdev->dev, NULL); + if (IS_ERR(tspi->clk)) { + ret = PTR_ERR(tspi->clk); + dev_err(&pdev->dev, "Can not get clock %d\n", ret); + goto exit_free_master; + } + ret = clk_prepare(tspi->clk); + if (ret < 0) { + dev_err(&pdev->dev, "Clock prepare failed %d\n", ret); + goto exit_free_master; + } + ret = clk_enable(tspi->clk); + if (ret < 0) { + dev_err(&pdev->dev, "Clock enable failed %d\n", ret); + goto exit_clk_unprepare; + } + + spi_irq = platform_get_irq(pdev, 0); + tspi->irq = spi_irq; + ret = request_threaded_irq(tspi->irq, tegra_slink_isr, + tegra_slink_isr_thread, IRQF_ONESHOT, + dev_name(&pdev->dev), tspi); + if (ret < 0) { + dev_err(&pdev->dev, "Failed to register ISR for IRQ %d\n", + tspi->irq); + goto exit_clk_disable; + } + + tspi->rst = devm_reset_control_get_exclusive(&pdev->dev, "spi"); + if (IS_ERR(tspi->rst)) { + dev_err(&pdev->dev, "can not get reset\n"); + ret = PTR_ERR(tspi->rst); + goto exit_free_irq; + } + + tspi->max_buf_size = SLINK_FIFO_DEPTH << 2; + tspi->dma_buf_size = DEFAULT_SPI_DMA_BUF_LEN; + + ret = tegra_slink_init_dma_param(tspi, true); + if (ret < 0) + goto exit_free_irq; + ret = tegra_slink_init_dma_param(tspi, false); + if (ret < 0) + goto exit_rx_dma_free; + tspi->max_buf_size = tspi->dma_buf_size; + init_completion(&tspi->tx_dma_complete); + init_completion(&tspi->rx_dma_complete); + + init_completion(&tspi->xfer_completion); + + pm_runtime_enable(&pdev->dev); + if (!pm_runtime_enabled(&pdev->dev)) { + ret = tegra_slink_runtime_resume(&pdev->dev); + if (ret) + goto exit_pm_disable; + } + + ret = pm_runtime_get_sync(&pdev->dev); + if (ret < 0) { + dev_err(&pdev->dev, "pm runtime get failed, e = %d\n", ret); + pm_runtime_put_noidle(&pdev->dev); + goto exit_pm_disable; + } + tspi->def_command_reg = SLINK_M_S; + tspi->def_command2_reg = SLINK_CS_ACTIVE_BETWEEN; + tegra_slink_writel(tspi, tspi->def_command_reg, SLINK_COMMAND); + tegra_slink_writel(tspi, tspi->def_command2_reg, SLINK_COMMAND2); + pm_runtime_put(&pdev->dev); + + master->dev.of_node = pdev->dev.of_node; + ret = devm_spi_register_master(&pdev->dev, master); + if (ret < 0) { + dev_err(&pdev->dev, "can not register to master err %d\n", ret); + goto exit_pm_disable; + } + return ret; + +exit_pm_disable: + pm_runtime_disable(&pdev->dev); + if (!pm_runtime_status_suspended(&pdev->dev)) + tegra_slink_runtime_suspend(&pdev->dev); + tegra_slink_deinit_dma_param(tspi, false); +exit_rx_dma_free: + tegra_slink_deinit_dma_param(tspi, true); +exit_free_irq: + free_irq(spi_irq, tspi); +exit_clk_disable: + clk_disable(tspi->clk); +exit_clk_unprepare: + clk_unprepare(tspi->clk); +exit_free_master: + spi_master_put(master); + return ret; +} + +static int tegra_slink_remove(struct platform_device *pdev) +{ + struct spi_master *master = platform_get_drvdata(pdev); + struct tegra_slink_data *tspi = spi_master_get_devdata(master); + + free_irq(tspi->irq, tspi); + + clk_disable(tspi->clk); + clk_unprepare(tspi->clk); + + if (tspi->tx_dma_chan) + tegra_slink_deinit_dma_param(tspi, false); + + if (tspi->rx_dma_chan) + tegra_slink_deinit_dma_param(tspi, true); + + pm_runtime_disable(&pdev->dev); + if (!pm_runtime_status_suspended(&pdev->dev)) + tegra_slink_runtime_suspend(&pdev->dev); + + return 0; +} + +#ifdef CONFIG_PM_SLEEP +static int tegra_slink_suspend(struct device *dev) +{ + struct spi_master *master = dev_get_drvdata(dev); + + return spi_master_suspend(master); +} + +static int tegra_slink_resume(struct device *dev) +{ + struct spi_master *master = dev_get_drvdata(dev); + struct tegra_slink_data *tspi = spi_master_get_devdata(master); + int ret; + + ret = pm_runtime_get_sync(dev); + if (ret < 0) { + pm_runtime_put_noidle(dev); + dev_err(dev, "pm runtime failed, e = %d\n", ret); + return ret; + } + tegra_slink_writel(tspi, tspi->command_reg, SLINK_COMMAND); + tegra_slink_writel(tspi, tspi->command2_reg, SLINK_COMMAND2); + pm_runtime_put(dev); + + return spi_master_resume(master); +} +#endif + +static int __maybe_unused tegra_slink_runtime_suspend(struct device *dev) +{ + struct spi_master *master = dev_get_drvdata(dev); + struct tegra_slink_data *tspi = spi_master_get_devdata(master); + + /* Flush all write which are in PPSB queue by reading back */ + tegra_slink_readl(tspi, SLINK_MAS_DATA); + + clk_disable_unprepare(tspi->clk); + return 0; +} + +static int __maybe_unused tegra_slink_runtime_resume(struct device *dev) +{ + struct spi_master *master = dev_get_drvdata(dev); + struct tegra_slink_data *tspi = spi_master_get_devdata(master); + int ret; + + ret = clk_prepare_enable(tspi->clk); + if (ret < 0) { + dev_err(tspi->dev, "clk_prepare failed: %d\n", ret); + return ret; + } + return 0; +} + +static const struct dev_pm_ops slink_pm_ops = { + SET_RUNTIME_PM_OPS(tegra_slink_runtime_suspend, + tegra_slink_runtime_resume, NULL) + SET_SYSTEM_SLEEP_PM_OPS(tegra_slink_suspend, tegra_slink_resume) +}; +static struct platform_driver tegra_slink_driver = { + .driver = { + .name = "spi-tegra-slink", + .pm = &slink_pm_ops, + .of_match_table = tegra_slink_of_match, + }, + .probe = tegra_slink_probe, + .remove = tegra_slink_remove, +}; +module_platform_driver(tegra_slink_driver); + +MODULE_ALIAS("platform:spi-tegra-slink"); +MODULE_DESCRIPTION("NVIDIA Tegra20/Tegra30 SLINK Controller Driver"); +MODULE_AUTHOR("Laxman Dewangan <ldewangan@nvidia.com>"); +MODULE_LICENSE("GPL v2"); diff --git a/drivers/spi/spi-test.h b/drivers/spi/spi-test.h new file mode 100644 index 000000000..5ddecf04a --- /dev/null +++ b/drivers/spi/spi-test.h @@ -0,0 +1,128 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +/* + * linux/drivers/spi/spi-test.h + * + * (c) Martin Sperl <kernel@martin.sperl.org> + * + * spi_test definitions + */ + +#include <linux/spi/spi.h> + +#define SPI_TEST_MAX_TRANSFERS 4 +#define SPI_TEST_MAX_SIZE (32 * PAGE_SIZE) +#define SPI_TEST_MAX_ITERATE 32 + +/* the "dummy" start addresses used in spi_test + * these addresses get translated at a later stage + */ +#define RX_START BIT(30) +#define TX_START BIT(31) +#define RX(off) ((void *)(RX_START + off)) +#define TX(off) ((void *)(TX_START + off)) + +/* some special defines for offsets */ +#define SPI_TEST_MAX_SIZE_HALF BIT(29) + +/* detection pattern for unfinished reads... + * - 0x00 or 0xff could be valid levels for tx_buf = NULL, + * so we do not use either of them + */ +#define SPI_TEST_PATTERN_UNWRITTEN 0xAA +#define SPI_TEST_PATTERN_DO_NOT_WRITE 0x55 +#define SPI_TEST_CHECK_DO_NOT_WRITE 64 + +/** + * struct spi_test - describes a specific (set of) tests to execute + * + * @description: description of the test + * + * @msg: a template @spi_message usedfor the default settings + * @transfers: array of @spi_transfers that are part of the + * resulting spi_message. + * @transfer_count: number of transfers + * + * @run_test: run a specific spi_test - this allows to override + * the default implementation of @spi_test_run_transfer + * either to add some custom filters for a specific test + * or to effectively run some very custom tests... + * @execute_msg: run the spi_message for real - this allows to override + * @spi_test_execute_msg to apply final modifications + * on the spi_message + * @expected_return: the expected return code - in some cases we want to + * test also for error conditions + * + * @iterate_len: list of length to iterate on + * @iterate_tx_align: change the alignment of @spi_transfer.tx_buf + * for all values in the below range if set. + * the ranges are: + * [0 : @spi_master.dma_alignment[ if set + * [0 : iterate_tx_align[ if unset + * @iterate_rx_align: change the alignment of @spi_transfer.rx_buf + * see @iterate_tx_align for details + * @iterate_transfer_mask: the bitmask of transfers to which the iterations + * apply - if 0, then it applies to all transfer + * + * @fill_option: define the way how tx_buf is filled + * @fill_pattern: fill pattern to apply to the tx_buf + * (used in some of the @fill_options) + * @elapsed_time: elapsed time in nanoseconds + */ + +struct spi_test { + char description[64]; + struct spi_message msg; + struct spi_transfer transfers[SPI_TEST_MAX_TRANSFERS]; + unsigned int transfer_count; + int (*run_test)(struct spi_device *spi, struct spi_test *test, + void *tx, void *rx); + int (*execute_msg)(struct spi_device *spi, struct spi_test *test, + void *tx, void *rx); + int expected_return; + /* iterate over all values, terminated by a -1 */ + int iterate_len[SPI_TEST_MAX_ITERATE]; + int iterate_tx_align; + int iterate_rx_align; + u32 iterate_transfer_mask; + /* the tx-fill operation */ + u32 fill_option; +#define FILL_MEMSET_8 0 /* just memset with 8 bit */ +#define FILL_MEMSET_16 1 /* just memset with 16 bit */ +#define FILL_MEMSET_24 2 /* just memset with 24 bit */ +#define FILL_MEMSET_32 3 /* just memset with 32 bit */ +#define FILL_COUNT_8 4 /* fill with a 8 byte counter */ +#define FILL_COUNT_16 5 /* fill with a 16 bit counter */ +#define FILL_COUNT_24 6 /* fill with a 24 bit counter */ +#define FILL_COUNT_32 7 /* fill with a 32 bit counter */ +#define FILL_TRANSFER_BYTE_8 8 /* fill with the transfer byte - 8 bit */ +#define FILL_TRANSFER_BYTE_16 9 /* fill with the transfer byte - 16 bit */ +#define FILL_TRANSFER_BYTE_24 10 /* fill with the transfer byte - 24 bit */ +#define FILL_TRANSFER_BYTE_32 11 /* fill with the transfer byte - 32 bit */ +#define FILL_TRANSFER_NUM 16 /* fill with the transfer number */ + u32 fill_pattern; + unsigned long long elapsed_time; +}; + +/* default implementation for @spi_test.run_test */ +int spi_test_run_test(struct spi_device *spi, + const struct spi_test *test, + void *tx, void *rx); + +/* default implementation for @spi_test.execute_msg */ +int spi_test_execute_msg(struct spi_device *spi, + struct spi_test *test, + void *tx, void *rx); + +/* function to execute a set of tests */ +int spi_test_run_tests(struct spi_device *spi, + struct spi_test *tests); + +#define ITERATE_LEN_LIST 0, 1, 2, 3, 7, 11, 16, 31, 32, 64, 97, 128, 251, 256, \ + 1021, 1024, 1031, 4093, PAGE_SIZE, 4099, 65536, 65537 +/* some of the default @spi_transfer.len to test, terminated by a -1 */ +#define ITERATE_LEN ITERATE_LEN_LIST, -1 +#define ITERATE_MAX_LEN ITERATE_LEN_LIST, (SPI_TEST_MAX_SIZE - 1), \ + SPI_TEST_MAX_SIZE, -1 + +/* the default alignment to test */ +#define ITERATE_ALIGN sizeof(int) diff --git a/drivers/spi/spi-ti-qspi.c b/drivers/spi/spi-ti-qspi.c new file mode 100644 index 000000000..081da1fd3 --- /dev/null +++ b/drivers/spi/spi-ti-qspi.c @@ -0,0 +1,945 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * TI QSPI driver + * + * Copyright (C) 2013 Texas Instruments Incorporated - https://www.ti.com + * Author: Sourav Poddar <sourav.poddar@ti.com> + */ + +#include <linux/kernel.h> +#include <linux/init.h> +#include <linux/interrupt.h> +#include <linux/module.h> +#include <linux/device.h> +#include <linux/delay.h> +#include <linux/dma-mapping.h> +#include <linux/dmaengine.h> +#include <linux/omap-dma.h> +#include <linux/platform_device.h> +#include <linux/err.h> +#include <linux/clk.h> +#include <linux/io.h> +#include <linux/slab.h> +#include <linux/pm_runtime.h> +#include <linux/of.h> +#include <linux/of_device.h> +#include <linux/pinctrl/consumer.h> +#include <linux/mfd/syscon.h> +#include <linux/regmap.h> +#include <linux/sizes.h> + +#include <linux/spi/spi.h> +#include <linux/spi/spi-mem.h> + +struct ti_qspi_regs { + u32 clkctrl; +}; + +struct ti_qspi { + struct completion transfer_complete; + + /* list synchronization */ + struct mutex list_lock; + + struct spi_master *master; + void __iomem *base; + void __iomem *mmap_base; + size_t mmap_size; + struct regmap *ctrl_base; + unsigned int ctrl_reg; + struct clk *fclk; + struct device *dev; + + struct ti_qspi_regs ctx_reg; + + dma_addr_t mmap_phys_base; + dma_addr_t rx_bb_dma_addr; + void *rx_bb_addr; + struct dma_chan *rx_chan; + + u32 spi_max_frequency; + u32 cmd; + u32 dc; + + bool mmap_enabled; + int current_cs; +}; + +#define QSPI_PID (0x0) +#define QSPI_SYSCONFIG (0x10) +#define QSPI_SPI_CLOCK_CNTRL_REG (0x40) +#define QSPI_SPI_DC_REG (0x44) +#define QSPI_SPI_CMD_REG (0x48) +#define QSPI_SPI_STATUS_REG (0x4c) +#define QSPI_SPI_DATA_REG (0x50) +#define QSPI_SPI_SETUP_REG(n) ((0x54 + 4 * n)) +#define QSPI_SPI_SWITCH_REG (0x64) +#define QSPI_SPI_DATA_REG_1 (0x68) +#define QSPI_SPI_DATA_REG_2 (0x6c) +#define QSPI_SPI_DATA_REG_3 (0x70) + +#define QSPI_COMPLETION_TIMEOUT msecs_to_jiffies(2000) + +/* Clock Control */ +#define QSPI_CLK_EN (1 << 31) +#define QSPI_CLK_DIV_MAX 0xffff + +/* Command */ +#define QSPI_EN_CS(n) (n << 28) +#define QSPI_WLEN(n) ((n - 1) << 19) +#define QSPI_3_PIN (1 << 18) +#define QSPI_RD_SNGL (1 << 16) +#define QSPI_WR_SNGL (2 << 16) +#define QSPI_RD_DUAL (3 << 16) +#define QSPI_RD_QUAD (7 << 16) +#define QSPI_INVAL (4 << 16) +#define QSPI_FLEN(n) ((n - 1) << 0) +#define QSPI_WLEN_MAX_BITS 128 +#define QSPI_WLEN_MAX_BYTES 16 +#define QSPI_WLEN_MASK QSPI_WLEN(QSPI_WLEN_MAX_BITS) + +/* STATUS REGISTER */ +#define BUSY 0x01 +#define WC 0x02 + +/* Device Control */ +#define QSPI_DD(m, n) (m << (3 + n * 8)) +#define QSPI_CKPHA(n) (1 << (2 + n * 8)) +#define QSPI_CSPOL(n) (1 << (1 + n * 8)) +#define QSPI_CKPOL(n) (1 << (n * 8)) + +#define QSPI_FRAME 4096 + +#define QSPI_AUTOSUSPEND_TIMEOUT 2000 + +#define MEM_CS_EN(n) ((n + 1) << 8) +#define MEM_CS_MASK (7 << 8) + +#define MM_SWITCH 0x1 + +#define QSPI_SETUP_RD_NORMAL (0x0 << 12) +#define QSPI_SETUP_RD_DUAL (0x1 << 12) +#define QSPI_SETUP_RD_QUAD (0x3 << 12) +#define QSPI_SETUP_ADDR_SHIFT 8 +#define QSPI_SETUP_DUMMY_SHIFT 10 + +#define QSPI_DMA_BUFFER_SIZE SZ_64K + +static inline unsigned long ti_qspi_read(struct ti_qspi *qspi, + unsigned long reg) +{ + return readl(qspi->base + reg); +} + +static inline void ti_qspi_write(struct ti_qspi *qspi, + unsigned long val, unsigned long reg) +{ + writel(val, qspi->base + reg); +} + +static int ti_qspi_setup(struct spi_device *spi) +{ + struct ti_qspi *qspi = spi_master_get_devdata(spi->master); + struct ti_qspi_regs *ctx_reg = &qspi->ctx_reg; + int clk_div = 0, ret; + u32 clk_ctrl_reg, clk_rate, clk_mask; + + if (spi->master->busy) { + dev_dbg(qspi->dev, "master busy doing other transfers\n"); + return -EBUSY; + } + + if (!qspi->spi_max_frequency) { + dev_err(qspi->dev, "spi max frequency not defined\n"); + return -EINVAL; + } + + clk_rate = clk_get_rate(qspi->fclk); + + clk_div = DIV_ROUND_UP(clk_rate, qspi->spi_max_frequency) - 1; + + if (clk_div < 0) { + dev_dbg(qspi->dev, "clock divider < 0, using /1 divider\n"); + return -EINVAL; + } + + if (clk_div > QSPI_CLK_DIV_MAX) { + dev_dbg(qspi->dev, "clock divider >%d , using /%d divider\n", + QSPI_CLK_DIV_MAX, QSPI_CLK_DIV_MAX + 1); + return -EINVAL; + } + + dev_dbg(qspi->dev, "hz: %d, clock divider %d\n", + qspi->spi_max_frequency, clk_div); + + ret = pm_runtime_get_sync(qspi->dev); + if (ret < 0) { + pm_runtime_put_noidle(qspi->dev); + dev_err(qspi->dev, "pm_runtime_get_sync() failed\n"); + return ret; + } + + clk_ctrl_reg = ti_qspi_read(qspi, QSPI_SPI_CLOCK_CNTRL_REG); + + clk_ctrl_reg &= ~QSPI_CLK_EN; + + /* disable SCLK */ + ti_qspi_write(qspi, clk_ctrl_reg, QSPI_SPI_CLOCK_CNTRL_REG); + + /* enable SCLK */ + clk_mask = QSPI_CLK_EN | clk_div; + ti_qspi_write(qspi, clk_mask, QSPI_SPI_CLOCK_CNTRL_REG); + ctx_reg->clkctrl = clk_mask; + + pm_runtime_mark_last_busy(qspi->dev); + ret = pm_runtime_put_autosuspend(qspi->dev); + if (ret < 0) { + dev_err(qspi->dev, "pm_runtime_put_autosuspend() failed\n"); + return ret; + } + + return 0; +} + +static void ti_qspi_restore_ctx(struct ti_qspi *qspi) +{ + struct ti_qspi_regs *ctx_reg = &qspi->ctx_reg; + + ti_qspi_write(qspi, ctx_reg->clkctrl, QSPI_SPI_CLOCK_CNTRL_REG); +} + +static inline u32 qspi_is_busy(struct ti_qspi *qspi) +{ + u32 stat; + unsigned long timeout = jiffies + QSPI_COMPLETION_TIMEOUT; + + stat = ti_qspi_read(qspi, QSPI_SPI_STATUS_REG); + while ((stat & BUSY) && time_after(timeout, jiffies)) { + cpu_relax(); + stat = ti_qspi_read(qspi, QSPI_SPI_STATUS_REG); + } + + WARN(stat & BUSY, "qspi busy\n"); + return stat & BUSY; +} + +static inline int ti_qspi_poll_wc(struct ti_qspi *qspi) +{ + u32 stat; + unsigned long timeout = jiffies + QSPI_COMPLETION_TIMEOUT; + + do { + stat = ti_qspi_read(qspi, QSPI_SPI_STATUS_REG); + if (stat & WC) + return 0; + cpu_relax(); + } while (time_after(timeout, jiffies)); + + stat = ti_qspi_read(qspi, QSPI_SPI_STATUS_REG); + if (stat & WC) + return 0; + return -ETIMEDOUT; +} + +static int qspi_write_msg(struct ti_qspi *qspi, struct spi_transfer *t, + int count) +{ + int wlen, xfer_len; + unsigned int cmd; + const u8 *txbuf; + u32 data; + + txbuf = t->tx_buf; + cmd = qspi->cmd | QSPI_WR_SNGL; + wlen = t->bits_per_word >> 3; /* in bytes */ + xfer_len = wlen; + + while (count) { + if (qspi_is_busy(qspi)) + return -EBUSY; + + switch (wlen) { + case 1: + dev_dbg(qspi->dev, "tx cmd %08x dc %08x data %02x\n", + cmd, qspi->dc, *txbuf); + if (count >= QSPI_WLEN_MAX_BYTES) { + u32 *txp = (u32 *)txbuf; + + data = cpu_to_be32(*txp++); + writel(data, qspi->base + + QSPI_SPI_DATA_REG_3); + data = cpu_to_be32(*txp++); + writel(data, qspi->base + + QSPI_SPI_DATA_REG_2); + data = cpu_to_be32(*txp++); + writel(data, qspi->base + + QSPI_SPI_DATA_REG_1); + data = cpu_to_be32(*txp++); + writel(data, qspi->base + + QSPI_SPI_DATA_REG); + xfer_len = QSPI_WLEN_MAX_BYTES; + cmd |= QSPI_WLEN(QSPI_WLEN_MAX_BITS); + } else { + writeb(*txbuf, qspi->base + QSPI_SPI_DATA_REG); + cmd = qspi->cmd | QSPI_WR_SNGL; + xfer_len = wlen; + cmd |= QSPI_WLEN(wlen); + } + break; + case 2: + dev_dbg(qspi->dev, "tx cmd %08x dc %08x data %04x\n", + cmd, qspi->dc, *txbuf); + writew(*((u16 *)txbuf), qspi->base + QSPI_SPI_DATA_REG); + break; + case 4: + dev_dbg(qspi->dev, "tx cmd %08x dc %08x data %08x\n", + cmd, qspi->dc, *txbuf); + writel(*((u32 *)txbuf), qspi->base + QSPI_SPI_DATA_REG); + break; + } + + ti_qspi_write(qspi, cmd, QSPI_SPI_CMD_REG); + if (ti_qspi_poll_wc(qspi)) { + dev_err(qspi->dev, "write timed out\n"); + return -ETIMEDOUT; + } + txbuf += xfer_len; + count -= xfer_len; + } + + return 0; +} + +static int qspi_read_msg(struct ti_qspi *qspi, struct spi_transfer *t, + int count) +{ + int wlen; + unsigned int cmd; + u32 rx; + u8 rxlen, rx_wlen; + u8 *rxbuf; + + rxbuf = t->rx_buf; + cmd = qspi->cmd; + switch (t->rx_nbits) { + case SPI_NBITS_DUAL: + cmd |= QSPI_RD_DUAL; + break; + case SPI_NBITS_QUAD: + cmd |= QSPI_RD_QUAD; + break; + default: + cmd |= QSPI_RD_SNGL; + break; + } + wlen = t->bits_per_word >> 3; /* in bytes */ + rx_wlen = wlen; + + while (count) { + dev_dbg(qspi->dev, "rx cmd %08x dc %08x\n", cmd, qspi->dc); + if (qspi_is_busy(qspi)) + return -EBUSY; + + switch (wlen) { + case 1: + /* + * Optimize the 8-bit words transfers, as used by + * the SPI flash devices. + */ + if (count >= QSPI_WLEN_MAX_BYTES) { + rxlen = QSPI_WLEN_MAX_BYTES; + } else { + rxlen = min(count, 4); + } + rx_wlen = rxlen << 3; + cmd &= ~QSPI_WLEN_MASK; + cmd |= QSPI_WLEN(rx_wlen); + break; + default: + rxlen = wlen; + break; + } + + ti_qspi_write(qspi, cmd, QSPI_SPI_CMD_REG); + if (ti_qspi_poll_wc(qspi)) { + dev_err(qspi->dev, "read timed out\n"); + return -ETIMEDOUT; + } + + switch (wlen) { + case 1: + /* + * Optimize the 8-bit words transfers, as used by + * the SPI flash devices. + */ + if (count >= QSPI_WLEN_MAX_BYTES) { + u32 *rxp = (u32 *) rxbuf; + rx = readl(qspi->base + QSPI_SPI_DATA_REG_3); + *rxp++ = be32_to_cpu(rx); + rx = readl(qspi->base + QSPI_SPI_DATA_REG_2); + *rxp++ = be32_to_cpu(rx); + rx = readl(qspi->base + QSPI_SPI_DATA_REG_1); + *rxp++ = be32_to_cpu(rx); + rx = readl(qspi->base + QSPI_SPI_DATA_REG); + *rxp++ = be32_to_cpu(rx); + } else { + u8 *rxp = rxbuf; + rx = readl(qspi->base + QSPI_SPI_DATA_REG); + if (rx_wlen >= 8) + *rxp++ = rx >> (rx_wlen - 8); + if (rx_wlen >= 16) + *rxp++ = rx >> (rx_wlen - 16); + if (rx_wlen >= 24) + *rxp++ = rx >> (rx_wlen - 24); + if (rx_wlen >= 32) + *rxp++ = rx; + } + break; + case 2: + *((u16 *)rxbuf) = readw(qspi->base + QSPI_SPI_DATA_REG); + break; + case 4: + *((u32 *)rxbuf) = readl(qspi->base + QSPI_SPI_DATA_REG); + break; + } + rxbuf += rxlen; + count -= rxlen; + } + + return 0; +} + +static int qspi_transfer_msg(struct ti_qspi *qspi, struct spi_transfer *t, + int count) +{ + int ret; + + if (t->tx_buf) { + ret = qspi_write_msg(qspi, t, count); + if (ret) { + dev_dbg(qspi->dev, "Error while writing\n"); + return ret; + } + } + + if (t->rx_buf) { + ret = qspi_read_msg(qspi, t, count); + if (ret) { + dev_dbg(qspi->dev, "Error while reading\n"); + return ret; + } + } + + return 0; +} + +static void ti_qspi_dma_callback(void *param) +{ + struct ti_qspi *qspi = param; + + complete(&qspi->transfer_complete); +} + +static int ti_qspi_dma_xfer(struct ti_qspi *qspi, dma_addr_t dma_dst, + dma_addr_t dma_src, size_t len) +{ + struct dma_chan *chan = qspi->rx_chan; + dma_cookie_t cookie; + enum dma_ctrl_flags flags = DMA_CTRL_ACK | DMA_PREP_INTERRUPT; + struct dma_async_tx_descriptor *tx; + int ret; + unsigned long time_left; + + tx = dmaengine_prep_dma_memcpy(chan, dma_dst, dma_src, len, flags); + if (!tx) { + dev_err(qspi->dev, "device_prep_dma_memcpy error\n"); + return -EIO; + } + + tx->callback = ti_qspi_dma_callback; + tx->callback_param = qspi; + cookie = tx->tx_submit(tx); + reinit_completion(&qspi->transfer_complete); + + ret = dma_submit_error(cookie); + if (ret) { + dev_err(qspi->dev, "dma_submit_error %d\n", cookie); + return -EIO; + } + + dma_async_issue_pending(chan); + time_left = wait_for_completion_timeout(&qspi->transfer_complete, + msecs_to_jiffies(len)); + if (time_left == 0) { + dmaengine_terminate_sync(chan); + dev_err(qspi->dev, "DMA wait_for_completion_timeout\n"); + return -ETIMEDOUT; + } + + return 0; +} + +static int ti_qspi_dma_bounce_buffer(struct ti_qspi *qspi, loff_t offs, + void *to, size_t readsize) +{ + dma_addr_t dma_src = qspi->mmap_phys_base + offs; + int ret = 0; + + /* + * Use bounce buffer as FS like jffs2, ubifs may pass + * buffers that does not belong to kernel lowmem region. + */ + while (readsize != 0) { + size_t xfer_len = min_t(size_t, QSPI_DMA_BUFFER_SIZE, + readsize); + + ret = ti_qspi_dma_xfer(qspi, qspi->rx_bb_dma_addr, + dma_src, xfer_len); + if (ret != 0) + return ret; + memcpy(to, qspi->rx_bb_addr, xfer_len); + readsize -= xfer_len; + dma_src += xfer_len; + to += xfer_len; + } + + return ret; +} + +static int ti_qspi_dma_xfer_sg(struct ti_qspi *qspi, struct sg_table rx_sg, + loff_t from) +{ + struct scatterlist *sg; + dma_addr_t dma_src = qspi->mmap_phys_base + from; + dma_addr_t dma_dst; + int i, len, ret; + + for_each_sg(rx_sg.sgl, sg, rx_sg.nents, i) { + dma_dst = sg_dma_address(sg); + len = sg_dma_len(sg); + ret = ti_qspi_dma_xfer(qspi, dma_dst, dma_src, len); + if (ret) + return ret; + dma_src += len; + } + + return 0; +} + +static void ti_qspi_enable_memory_map(struct spi_device *spi) +{ + struct ti_qspi *qspi = spi_master_get_devdata(spi->master); + + ti_qspi_write(qspi, MM_SWITCH, QSPI_SPI_SWITCH_REG); + if (qspi->ctrl_base) { + regmap_update_bits(qspi->ctrl_base, qspi->ctrl_reg, + MEM_CS_MASK, + MEM_CS_EN(spi->chip_select)); + } + qspi->mmap_enabled = true; + qspi->current_cs = spi->chip_select; +} + +static void ti_qspi_disable_memory_map(struct spi_device *spi) +{ + struct ti_qspi *qspi = spi_master_get_devdata(spi->master); + + ti_qspi_write(qspi, 0, QSPI_SPI_SWITCH_REG); + if (qspi->ctrl_base) + regmap_update_bits(qspi->ctrl_base, qspi->ctrl_reg, + MEM_CS_MASK, 0); + qspi->mmap_enabled = false; + qspi->current_cs = -1; +} + +static void ti_qspi_setup_mmap_read(struct spi_device *spi, u8 opcode, + u8 data_nbits, u8 addr_width, + u8 dummy_bytes) +{ + struct ti_qspi *qspi = spi_master_get_devdata(spi->master); + u32 memval = opcode; + + switch (data_nbits) { + case SPI_NBITS_QUAD: + memval |= QSPI_SETUP_RD_QUAD; + break; + case SPI_NBITS_DUAL: + memval |= QSPI_SETUP_RD_DUAL; + break; + default: + memval |= QSPI_SETUP_RD_NORMAL; + break; + } + memval |= ((addr_width - 1) << QSPI_SETUP_ADDR_SHIFT | + dummy_bytes << QSPI_SETUP_DUMMY_SHIFT); + ti_qspi_write(qspi, memval, + QSPI_SPI_SETUP_REG(spi->chip_select)); +} + +static int ti_qspi_adjust_op_size(struct spi_mem *mem, struct spi_mem_op *op) +{ + struct ti_qspi *qspi = spi_controller_get_devdata(mem->spi->master); + size_t max_len; + + if (op->data.dir == SPI_MEM_DATA_IN) { + if (op->addr.val < qspi->mmap_size) { + /* Limit MMIO to the mmaped region */ + if (op->addr.val + op->data.nbytes > qspi->mmap_size) { + max_len = qspi->mmap_size - op->addr.val; + op->data.nbytes = min((size_t) op->data.nbytes, + max_len); + } + } else { + /* + * Use fallback mode (SW generated transfers) above the + * mmaped region. + * Adjust size to comply with the QSPI max frame length. + */ + max_len = QSPI_FRAME; + max_len -= 1 + op->addr.nbytes + op->dummy.nbytes; + op->data.nbytes = min((size_t) op->data.nbytes, + max_len); + } + } + + return 0; +} + +static int ti_qspi_exec_mem_op(struct spi_mem *mem, + const struct spi_mem_op *op) +{ + struct ti_qspi *qspi = spi_master_get_devdata(mem->spi->master); + u32 from = 0; + int ret = 0; + + /* Only optimize read path. */ + if (!op->data.nbytes || op->data.dir != SPI_MEM_DATA_IN || + !op->addr.nbytes || op->addr.nbytes > 4) + return -ENOTSUPP; + + /* Address exceeds MMIO window size, fall back to regular mode. */ + from = op->addr.val; + if (from + op->data.nbytes > qspi->mmap_size) + return -ENOTSUPP; + + mutex_lock(&qspi->list_lock); + + if (!qspi->mmap_enabled || qspi->current_cs != mem->spi->chip_select) + ti_qspi_enable_memory_map(mem->spi); + ti_qspi_setup_mmap_read(mem->spi, op->cmd.opcode, op->data.buswidth, + op->addr.nbytes, op->dummy.nbytes); + + if (qspi->rx_chan) { + struct sg_table sgt; + + if (virt_addr_valid(op->data.buf.in) && + !spi_controller_dma_map_mem_op_data(mem->spi->master, op, + &sgt)) { + ret = ti_qspi_dma_xfer_sg(qspi, sgt, from); + spi_controller_dma_unmap_mem_op_data(mem->spi->master, + op, &sgt); + } else { + ret = ti_qspi_dma_bounce_buffer(qspi, from, + op->data.buf.in, + op->data.nbytes); + } + } else { + memcpy_fromio(op->data.buf.in, qspi->mmap_base + from, + op->data.nbytes); + } + + mutex_unlock(&qspi->list_lock); + + return ret; +} + +static const struct spi_controller_mem_ops ti_qspi_mem_ops = { + .exec_op = ti_qspi_exec_mem_op, + .adjust_op_size = ti_qspi_adjust_op_size, +}; + +static int ti_qspi_start_transfer_one(struct spi_master *master, + struct spi_message *m) +{ + struct ti_qspi *qspi = spi_master_get_devdata(master); + struct spi_device *spi = m->spi; + struct spi_transfer *t; + int status = 0, ret; + unsigned int frame_len_words, transfer_len_words; + int wlen; + + /* setup device control reg */ + qspi->dc = 0; + + if (spi->mode & SPI_CPHA) + qspi->dc |= QSPI_CKPHA(spi->chip_select); + if (spi->mode & SPI_CPOL) + qspi->dc |= QSPI_CKPOL(spi->chip_select); + if (spi->mode & SPI_CS_HIGH) + qspi->dc |= QSPI_CSPOL(spi->chip_select); + + frame_len_words = 0; + list_for_each_entry(t, &m->transfers, transfer_list) + frame_len_words += t->len / (t->bits_per_word >> 3); + frame_len_words = min_t(unsigned int, frame_len_words, QSPI_FRAME); + + /* setup command reg */ + qspi->cmd = 0; + qspi->cmd |= QSPI_EN_CS(spi->chip_select); + qspi->cmd |= QSPI_FLEN(frame_len_words); + + ti_qspi_write(qspi, qspi->dc, QSPI_SPI_DC_REG); + + mutex_lock(&qspi->list_lock); + + if (qspi->mmap_enabled) + ti_qspi_disable_memory_map(spi); + + list_for_each_entry(t, &m->transfers, transfer_list) { + qspi->cmd = ((qspi->cmd & ~QSPI_WLEN_MASK) | + QSPI_WLEN(t->bits_per_word)); + + wlen = t->bits_per_word >> 3; + transfer_len_words = min(t->len / wlen, frame_len_words); + + ret = qspi_transfer_msg(qspi, t, transfer_len_words * wlen); + if (ret) { + dev_dbg(qspi->dev, "transfer message failed\n"); + mutex_unlock(&qspi->list_lock); + return -EINVAL; + } + + m->actual_length += transfer_len_words * wlen; + frame_len_words -= transfer_len_words; + if (frame_len_words == 0) + break; + } + + mutex_unlock(&qspi->list_lock); + + ti_qspi_write(qspi, qspi->cmd | QSPI_INVAL, QSPI_SPI_CMD_REG); + m->status = status; + spi_finalize_current_message(master); + + return status; +} + +static int ti_qspi_runtime_resume(struct device *dev) +{ + struct ti_qspi *qspi; + + qspi = dev_get_drvdata(dev); + ti_qspi_restore_ctx(qspi); + + return 0; +} + +static void ti_qspi_dma_cleanup(struct ti_qspi *qspi) +{ + if (qspi->rx_bb_addr) + dma_free_coherent(qspi->dev, QSPI_DMA_BUFFER_SIZE, + qspi->rx_bb_addr, + qspi->rx_bb_dma_addr); + + if (qspi->rx_chan) + dma_release_channel(qspi->rx_chan); +} + +static const struct of_device_id ti_qspi_match[] = { + {.compatible = "ti,dra7xxx-qspi" }, + {.compatible = "ti,am4372-qspi" }, + {}, +}; +MODULE_DEVICE_TABLE(of, ti_qspi_match); + +static int ti_qspi_probe(struct platform_device *pdev) +{ + struct ti_qspi *qspi; + struct spi_master *master; + struct resource *r, *res_mmap; + struct device_node *np = pdev->dev.of_node; + u32 max_freq; + int ret = 0, num_cs, irq; + dma_cap_mask_t mask; + + master = spi_alloc_master(&pdev->dev, sizeof(*qspi)); + if (!master) + return -ENOMEM; + + master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_RX_DUAL | SPI_RX_QUAD; + + master->flags = SPI_MASTER_HALF_DUPLEX; + master->setup = ti_qspi_setup; + master->auto_runtime_pm = true; + master->transfer_one_message = ti_qspi_start_transfer_one; + master->dev.of_node = pdev->dev.of_node; + master->bits_per_word_mask = SPI_BPW_MASK(32) | SPI_BPW_MASK(16) | + SPI_BPW_MASK(8); + master->mem_ops = &ti_qspi_mem_ops; + + if (!of_property_read_u32(np, "num-cs", &num_cs)) + master->num_chipselect = num_cs; + + qspi = spi_master_get_devdata(master); + qspi->master = master; + qspi->dev = &pdev->dev; + platform_set_drvdata(pdev, qspi); + + r = platform_get_resource_byname(pdev, IORESOURCE_MEM, "qspi_base"); + if (r == NULL) { + r = platform_get_resource(pdev, IORESOURCE_MEM, 0); + if (r == NULL) { + dev_err(&pdev->dev, "missing platform data\n"); + ret = -ENODEV; + goto free_master; + } + } + + res_mmap = platform_get_resource_byname(pdev, + IORESOURCE_MEM, "qspi_mmap"); + if (res_mmap == NULL) { + res_mmap = platform_get_resource(pdev, IORESOURCE_MEM, 1); + if (res_mmap == NULL) { + dev_err(&pdev->dev, + "memory mapped resource not required\n"); + } + } + + if (res_mmap) + qspi->mmap_size = resource_size(res_mmap); + + irq = platform_get_irq(pdev, 0); + if (irq < 0) { + ret = irq; + goto free_master; + } + + mutex_init(&qspi->list_lock); + + qspi->base = devm_ioremap_resource(&pdev->dev, r); + if (IS_ERR(qspi->base)) { + ret = PTR_ERR(qspi->base); + goto free_master; + } + + + if (of_property_read_bool(np, "syscon-chipselects")) { + qspi->ctrl_base = + syscon_regmap_lookup_by_phandle(np, + "syscon-chipselects"); + if (IS_ERR(qspi->ctrl_base)) { + ret = PTR_ERR(qspi->ctrl_base); + goto free_master; + } + ret = of_property_read_u32_index(np, + "syscon-chipselects", + 1, &qspi->ctrl_reg); + if (ret) { + dev_err(&pdev->dev, + "couldn't get ctrl_mod reg index\n"); + goto free_master; + } + } + + qspi->fclk = devm_clk_get(&pdev->dev, "fck"); + if (IS_ERR(qspi->fclk)) { + ret = PTR_ERR(qspi->fclk); + dev_err(&pdev->dev, "could not get clk: %d\n", ret); + } + + pm_runtime_use_autosuspend(&pdev->dev); + pm_runtime_set_autosuspend_delay(&pdev->dev, QSPI_AUTOSUSPEND_TIMEOUT); + pm_runtime_enable(&pdev->dev); + + if (!of_property_read_u32(np, "spi-max-frequency", &max_freq)) + qspi->spi_max_frequency = max_freq; + + dma_cap_zero(mask); + dma_cap_set(DMA_MEMCPY, mask); + + qspi->rx_chan = dma_request_chan_by_mask(&mask); + if (IS_ERR(qspi->rx_chan)) { + dev_err(qspi->dev, + "No Rx DMA available, trying mmap mode\n"); + qspi->rx_chan = NULL; + ret = 0; + goto no_dma; + } + qspi->rx_bb_addr = dma_alloc_coherent(qspi->dev, + QSPI_DMA_BUFFER_SIZE, + &qspi->rx_bb_dma_addr, + GFP_KERNEL | GFP_DMA); + if (!qspi->rx_bb_addr) { + dev_err(qspi->dev, + "dma_alloc_coherent failed, using PIO mode\n"); + dma_release_channel(qspi->rx_chan); + goto no_dma; + } + master->dma_rx = qspi->rx_chan; + init_completion(&qspi->transfer_complete); + if (res_mmap) + qspi->mmap_phys_base = (dma_addr_t)res_mmap->start; + +no_dma: + if (!qspi->rx_chan && res_mmap) { + qspi->mmap_base = devm_ioremap_resource(&pdev->dev, res_mmap); + if (IS_ERR(qspi->mmap_base)) { + dev_info(&pdev->dev, + "mmap failed with error %ld using PIO mode\n", + PTR_ERR(qspi->mmap_base)); + qspi->mmap_base = NULL; + master->mem_ops = NULL; + } + } + qspi->mmap_enabled = false; + qspi->current_cs = -1; + + ret = devm_spi_register_master(&pdev->dev, master); + if (!ret) + return 0; + + ti_qspi_dma_cleanup(qspi); + + pm_runtime_disable(&pdev->dev); +free_master: + spi_master_put(master); + return ret; +} + +static int ti_qspi_remove(struct platform_device *pdev) +{ + struct ti_qspi *qspi = platform_get_drvdata(pdev); + int rc; + + rc = spi_master_suspend(qspi->master); + if (rc) + return rc; + + pm_runtime_put_sync(&pdev->dev); + pm_runtime_disable(&pdev->dev); + + ti_qspi_dma_cleanup(qspi); + + return 0; +} + +static const struct dev_pm_ops ti_qspi_pm_ops = { + .runtime_resume = ti_qspi_runtime_resume, +}; + +static struct platform_driver ti_qspi_driver = { + .probe = ti_qspi_probe, + .remove = ti_qspi_remove, + .driver = { + .name = "ti-qspi", + .pm = &ti_qspi_pm_ops, + .of_match_table = ti_qspi_match, + } +}; + +module_platform_driver(ti_qspi_driver); + +MODULE_AUTHOR("Sourav Poddar <sourav.poddar@ti.com>"); +MODULE_LICENSE("GPL v2"); +MODULE_DESCRIPTION("TI QSPI controller driver"); +MODULE_ALIAS("platform:ti-qspi"); diff --git a/drivers/spi/spi-tle62x0.c b/drivers/spi/spi-tle62x0.c new file mode 100644 index 000000000..60dc69a39 --- /dev/null +++ b/drivers/spi/spi-tle62x0.c @@ -0,0 +1,317 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Support Infineon TLE62x0 driver chips + * + * Copyright (c) 2007 Simtec Electronics + * Ben Dooks, <ben@simtec.co.uk> + */ + +#include <linux/device.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/slab.h> + +#include <linux/spi/spi.h> +#include <linux/spi/tle62x0.h> + + +#define CMD_READ 0x00 +#define CMD_SET 0xff + +#define DIAG_NORMAL 0x03 +#define DIAG_OVERLOAD 0x02 +#define DIAG_OPEN 0x01 +#define DIAG_SHORTGND 0x00 + +struct tle62x0_state { + struct spi_device *us; + struct mutex lock; + unsigned int nr_gpio; + unsigned int gpio_state; + + unsigned char tx_buff[4]; + unsigned char rx_buff[4]; +}; + +static int to_gpio_num(struct device_attribute *attr); + +static inline int tle62x0_write(struct tle62x0_state *st) +{ + unsigned char *buff = st->tx_buff; + unsigned int gpio_state = st->gpio_state; + + buff[0] = CMD_SET; + + if (st->nr_gpio == 16) { + buff[1] = gpio_state >> 8; + buff[2] = gpio_state; + } else { + buff[1] = gpio_state; + } + + dev_dbg(&st->us->dev, "buff %3ph\n", buff); + + return spi_write(st->us, buff, (st->nr_gpio == 16) ? 3 : 2); +} + +static inline int tle62x0_read(struct tle62x0_state *st) +{ + unsigned char *txbuff = st->tx_buff; + struct spi_transfer xfer = { + .tx_buf = txbuff, + .rx_buf = st->rx_buff, + .len = (st->nr_gpio * 2) / 8, + }; + struct spi_message msg; + + txbuff[0] = CMD_READ; + txbuff[1] = 0x00; + txbuff[2] = 0x00; + txbuff[3] = 0x00; + + spi_message_init(&msg); + spi_message_add_tail(&xfer, &msg); + + return spi_sync(st->us, &msg); +} + +static unsigned char *decode_fault(unsigned int fault_code) +{ + fault_code &= 3; + + switch (fault_code) { + case DIAG_NORMAL: + return "N"; + case DIAG_OVERLOAD: + return "V"; + case DIAG_OPEN: + return "O"; + case DIAG_SHORTGND: + return "G"; + } + + return "?"; +} + +static ssize_t tle62x0_status_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct tle62x0_state *st = dev_get_drvdata(dev); + char *bp = buf; + unsigned char *buff = st->rx_buff; + unsigned long fault = 0; + int ptr; + int ret; + + mutex_lock(&st->lock); + ret = tle62x0_read(st); + dev_dbg(dev, "tle62x0_read() returned %d\n", ret); + if (ret < 0) { + mutex_unlock(&st->lock); + return ret; + } + + for (ptr = 0; ptr < (st->nr_gpio * 2)/8; ptr += 1) { + fault <<= 8; + fault |= ((unsigned long)buff[ptr]); + + dev_dbg(dev, "byte %d is %02x\n", ptr, buff[ptr]); + } + + for (ptr = 0; ptr < st->nr_gpio; ptr++) { + bp += sprintf(bp, "%s ", decode_fault(fault >> (ptr * 2))); + } + + *bp++ = '\n'; + + mutex_unlock(&st->lock); + return bp - buf; +} + +static DEVICE_ATTR(status_show, S_IRUGO, tle62x0_status_show, NULL); + +static ssize_t tle62x0_gpio_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct tle62x0_state *st = dev_get_drvdata(dev); + int gpio_num = to_gpio_num(attr); + int value; + + mutex_lock(&st->lock); + value = (st->gpio_state >> gpio_num) & 1; + mutex_unlock(&st->lock); + + return snprintf(buf, PAGE_SIZE, "%d", value); +} + +static ssize_t tle62x0_gpio_store(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t len) +{ + struct tle62x0_state *st = dev_get_drvdata(dev); + int gpio_num = to_gpio_num(attr); + unsigned long val; + char *endp; + + val = simple_strtoul(buf, &endp, 0); + if (buf == endp) + return -EINVAL; + + dev_dbg(dev, "setting gpio %d to %ld\n", gpio_num, val); + + mutex_lock(&st->lock); + + if (val) + st->gpio_state |= 1 << gpio_num; + else + st->gpio_state &= ~(1 << gpio_num); + + tle62x0_write(st); + mutex_unlock(&st->lock); + + return len; +} + +static DEVICE_ATTR(gpio1, S_IWUSR|S_IRUGO, + tle62x0_gpio_show, tle62x0_gpio_store); +static DEVICE_ATTR(gpio2, S_IWUSR|S_IRUGO, + tle62x0_gpio_show, tle62x0_gpio_store); +static DEVICE_ATTR(gpio3, S_IWUSR|S_IRUGO, + tle62x0_gpio_show, tle62x0_gpio_store); +static DEVICE_ATTR(gpio4, S_IWUSR|S_IRUGO, + tle62x0_gpio_show, tle62x0_gpio_store); +static DEVICE_ATTR(gpio5, S_IWUSR|S_IRUGO, + tle62x0_gpio_show, tle62x0_gpio_store); +static DEVICE_ATTR(gpio6, S_IWUSR|S_IRUGO, + tle62x0_gpio_show, tle62x0_gpio_store); +static DEVICE_ATTR(gpio7, S_IWUSR|S_IRUGO, + tle62x0_gpio_show, tle62x0_gpio_store); +static DEVICE_ATTR(gpio8, S_IWUSR|S_IRUGO, + tle62x0_gpio_show, tle62x0_gpio_store); +static DEVICE_ATTR(gpio9, S_IWUSR|S_IRUGO, + tle62x0_gpio_show, tle62x0_gpio_store); +static DEVICE_ATTR(gpio10, S_IWUSR|S_IRUGO, + tle62x0_gpio_show, tle62x0_gpio_store); +static DEVICE_ATTR(gpio11, S_IWUSR|S_IRUGO, + tle62x0_gpio_show, tle62x0_gpio_store); +static DEVICE_ATTR(gpio12, S_IWUSR|S_IRUGO, + tle62x0_gpio_show, tle62x0_gpio_store); +static DEVICE_ATTR(gpio13, S_IWUSR|S_IRUGO, + tle62x0_gpio_show, tle62x0_gpio_store); +static DEVICE_ATTR(gpio14, S_IWUSR|S_IRUGO, + tle62x0_gpio_show, tle62x0_gpio_store); +static DEVICE_ATTR(gpio15, S_IWUSR|S_IRUGO, + tle62x0_gpio_show, tle62x0_gpio_store); +static DEVICE_ATTR(gpio16, S_IWUSR|S_IRUGO, + tle62x0_gpio_show, tle62x0_gpio_store); + +static struct device_attribute *gpio_attrs[] = { + [0] = &dev_attr_gpio1, + [1] = &dev_attr_gpio2, + [2] = &dev_attr_gpio3, + [3] = &dev_attr_gpio4, + [4] = &dev_attr_gpio5, + [5] = &dev_attr_gpio6, + [6] = &dev_attr_gpio7, + [7] = &dev_attr_gpio8, + [8] = &dev_attr_gpio9, + [9] = &dev_attr_gpio10, + [10] = &dev_attr_gpio11, + [11] = &dev_attr_gpio12, + [12] = &dev_attr_gpio13, + [13] = &dev_attr_gpio14, + [14] = &dev_attr_gpio15, + [15] = &dev_attr_gpio16 +}; + +static int to_gpio_num(struct device_attribute *attr) +{ + int ptr; + + for (ptr = 0; ptr < ARRAY_SIZE(gpio_attrs); ptr++) { + if (gpio_attrs[ptr] == attr) + return ptr; + } + + return -1; +} + +static int tle62x0_probe(struct spi_device *spi) +{ + struct tle62x0_state *st; + struct tle62x0_pdata *pdata; + int ptr; + int ret; + + pdata = dev_get_platdata(&spi->dev); + if (pdata == NULL) { + dev_err(&spi->dev, "no device data specified\n"); + return -EINVAL; + } + + st = kzalloc(sizeof(struct tle62x0_state), GFP_KERNEL); + if (st == NULL) + return -ENOMEM; + + st->us = spi; + st->nr_gpio = pdata->gpio_count; + st->gpio_state = pdata->init_state; + + mutex_init(&st->lock); + + ret = device_create_file(&spi->dev, &dev_attr_status_show); + if (ret) { + dev_err(&spi->dev, "cannot create status attribute\n"); + goto err_status; + } + + for (ptr = 0; ptr < pdata->gpio_count; ptr++) { + ret = device_create_file(&spi->dev, gpio_attrs[ptr]); + if (ret) { + dev_err(&spi->dev, "cannot create gpio attribute\n"); + goto err_gpios; + } + } + + /* tle62x0_write(st); */ + spi_set_drvdata(spi, st); + return 0; + + err_gpios: + while (--ptr >= 0) + device_remove_file(&spi->dev, gpio_attrs[ptr]); + + device_remove_file(&spi->dev, &dev_attr_status_show); + + err_status: + kfree(st); + return ret; +} + +static int tle62x0_remove(struct spi_device *spi) +{ + struct tle62x0_state *st = spi_get_drvdata(spi); + int ptr; + + for (ptr = 0; ptr < st->nr_gpio; ptr++) + device_remove_file(&spi->dev, gpio_attrs[ptr]); + + device_remove_file(&spi->dev, &dev_attr_status_show); + kfree(st); + return 0; +} + +static struct spi_driver tle62x0_driver = { + .driver = { + .name = "tle62x0", + }, + .probe = tle62x0_probe, + .remove = tle62x0_remove, +}; + +module_spi_driver(tle62x0_driver); + +MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>"); +MODULE_DESCRIPTION("TLE62x0 SPI driver"); +MODULE_LICENSE("GPL v2"); +MODULE_ALIAS("spi:tle62x0"); diff --git a/drivers/spi/spi-topcliff-pch.c b/drivers/spi/spi-topcliff-pch.c new file mode 100644 index 000000000..7fb020a1d --- /dev/null +++ b/drivers/spi/spi-topcliff-pch.c @@ -0,0 +1,1704 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * SPI bus driver for the Topcliff PCH used by Intel SoCs + * + * Copyright (C) 2011 LAPIS Semiconductor Co., Ltd. + */ + +#include <linux/delay.h> +#include <linux/pci.h> +#include <linux/wait.h> +#include <linux/spi/spi.h> +#include <linux/interrupt.h> +#include <linux/sched.h> +#include <linux/spi/spidev.h> +#include <linux/module.h> +#include <linux/device.h> +#include <linux/platform_device.h> + +#include <linux/dmaengine.h> +#include <linux/pch_dma.h> + +/* Register offsets */ +#define PCH_SPCR 0x00 /* SPI control register */ +#define PCH_SPBRR 0x04 /* SPI baud rate register */ +#define PCH_SPSR 0x08 /* SPI status register */ +#define PCH_SPDWR 0x0C /* SPI write data register */ +#define PCH_SPDRR 0x10 /* SPI read data register */ +#define PCH_SSNXCR 0x18 /* SSN Expand Control Register */ +#define PCH_SRST 0x1C /* SPI reset register */ +#define PCH_ADDRESS_SIZE 0x20 + +#define PCH_SPSR_TFD 0x000007C0 +#define PCH_SPSR_RFD 0x0000F800 + +#define PCH_READABLE(x) (((x) & PCH_SPSR_RFD)>>11) +#define PCH_WRITABLE(x) (((x) & PCH_SPSR_TFD)>>6) + +#define PCH_RX_THOLD 7 +#define PCH_RX_THOLD_MAX 15 + +#define PCH_TX_THOLD 2 + +#define PCH_MAX_BAUDRATE 5000000 +#define PCH_MAX_FIFO_DEPTH 16 + +#define STATUS_RUNNING 1 +#define STATUS_EXITING 2 +#define PCH_SLEEP_TIME 10 + +#define SSN_LOW 0x02U +#define SSN_HIGH 0x03U +#define SSN_NO_CONTROL 0x00U +#define PCH_MAX_CS 0xFF +#define PCI_DEVICE_ID_GE_SPI 0x8816 + +#define SPCR_SPE_BIT (1 << 0) +#define SPCR_MSTR_BIT (1 << 1) +#define SPCR_LSBF_BIT (1 << 4) +#define SPCR_CPHA_BIT (1 << 5) +#define SPCR_CPOL_BIT (1 << 6) +#define SPCR_TFIE_BIT (1 << 8) +#define SPCR_RFIE_BIT (1 << 9) +#define SPCR_FIE_BIT (1 << 10) +#define SPCR_ORIE_BIT (1 << 11) +#define SPCR_MDFIE_BIT (1 << 12) +#define SPCR_FICLR_BIT (1 << 24) +#define SPSR_TFI_BIT (1 << 0) +#define SPSR_RFI_BIT (1 << 1) +#define SPSR_FI_BIT (1 << 2) +#define SPSR_ORF_BIT (1 << 3) +#define SPBRR_SIZE_BIT (1 << 10) + +#define PCH_ALL (SPCR_TFIE_BIT|SPCR_RFIE_BIT|SPCR_FIE_BIT|\ + SPCR_ORIE_BIT|SPCR_MDFIE_BIT) + +#define SPCR_RFIC_FIELD 20 +#define SPCR_TFIC_FIELD 16 + +#define MASK_SPBRR_SPBR_BITS ((1 << 10) - 1) +#define MASK_RFIC_SPCR_BITS (0xf << SPCR_RFIC_FIELD) +#define MASK_TFIC_SPCR_BITS (0xf << SPCR_TFIC_FIELD) + +#define PCH_CLOCK_HZ 50000000 +#define PCH_MAX_SPBR 1023 + +/* Definition for ML7213/ML7223/ML7831 by LAPIS Semiconductor */ +#define PCI_DEVICE_ID_ML7213_SPI 0x802c +#define PCI_DEVICE_ID_ML7223_SPI 0x800F +#define PCI_DEVICE_ID_ML7831_SPI 0x8816 + +/* + * Set the number of SPI instance max + * Intel EG20T PCH : 1ch + * LAPIS Semiconductor ML7213 IOH : 2ch + * LAPIS Semiconductor ML7223 IOH : 1ch + * LAPIS Semiconductor ML7831 IOH : 1ch +*/ +#define PCH_SPI_MAX_DEV 2 + +#define PCH_BUF_SIZE 4096 +#define PCH_DMA_TRANS_SIZE 12 + +static int use_dma = 1; + +struct pch_spi_dma_ctrl { + struct dma_async_tx_descriptor *desc_tx; + struct dma_async_tx_descriptor *desc_rx; + struct pch_dma_slave param_tx; + struct pch_dma_slave param_rx; + struct dma_chan *chan_tx; + struct dma_chan *chan_rx; + struct scatterlist *sg_tx_p; + struct scatterlist *sg_rx_p; + struct scatterlist sg_tx; + struct scatterlist sg_rx; + int nent; + void *tx_buf_virt; + void *rx_buf_virt; + dma_addr_t tx_buf_dma; + dma_addr_t rx_buf_dma; +}; +/** + * struct pch_spi_data - Holds the SPI channel specific details + * @io_remap_addr: The remapped PCI base address + * @io_base_addr: Base address + * @master: Pointer to the SPI master structure + * @work: Reference to work queue handler + * @wait: Wait queue for waking up upon receiving an + * interrupt. + * @transfer_complete: Status of SPI Transfer + * @bcurrent_msg_processing: Status flag for message processing + * @lock: Lock for protecting this structure + * @queue: SPI Message queue + * @status: Status of the SPI driver + * @bpw_len: Length of data to be transferred in bits per + * word + * @transfer_active: Flag showing active transfer + * @tx_index: Transmit data count; for bookkeeping during + * transfer + * @rx_index: Receive data count; for bookkeeping during + * transfer + * @pkt_tx_buff: Buffer for data to be transmitted + * @pkt_rx_buff: Buffer for received data + * @n_curnt_chip: The chip number that this SPI driver currently + * operates on + * @current_chip: Reference to the current chip that this SPI + * driver currently operates on + * @current_msg: The current message that this SPI driver is + * handling + * @cur_trans: The current transfer that this SPI driver is + * handling + * @board_dat: Reference to the SPI device data structure + * @plat_dev: platform_device structure + * @ch: SPI channel number + * @dma: Local DMA information + * @use_dma: True if DMA is to be used + * @irq_reg_sts: Status of IRQ registration + * @save_total_len: Save length while data is being transferred + */ +struct pch_spi_data { + void __iomem *io_remap_addr; + unsigned long io_base_addr; + struct spi_master *master; + struct work_struct work; + wait_queue_head_t wait; + u8 transfer_complete; + u8 bcurrent_msg_processing; + spinlock_t lock; + struct list_head queue; + u8 status; + u32 bpw_len; + u8 transfer_active; + u32 tx_index; + u32 rx_index; + u16 *pkt_tx_buff; + u16 *pkt_rx_buff; + u8 n_curnt_chip; + struct spi_device *current_chip; + struct spi_message *current_msg; + struct spi_transfer *cur_trans; + struct pch_spi_board_data *board_dat; + struct platform_device *plat_dev; + int ch; + struct pch_spi_dma_ctrl dma; + int use_dma; + u8 irq_reg_sts; + int save_total_len; +}; + +/** + * struct pch_spi_board_data - Holds the SPI device specific details + * @pdev: Pointer to the PCI device + * @suspend_sts: Status of suspend + * @num: The number of SPI device instance + */ +struct pch_spi_board_data { + struct pci_dev *pdev; + u8 suspend_sts; + int num; +}; + +struct pch_pd_dev_save { + int num; + struct platform_device *pd_save[PCH_SPI_MAX_DEV]; + struct pch_spi_board_data *board_dat; +}; + +static const struct pci_device_id pch_spi_pcidev_id[] = { + { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_GE_SPI), 1, }, + { PCI_VDEVICE(ROHM, PCI_DEVICE_ID_ML7213_SPI), 2, }, + { PCI_VDEVICE(ROHM, PCI_DEVICE_ID_ML7223_SPI), 1, }, + { PCI_VDEVICE(ROHM, PCI_DEVICE_ID_ML7831_SPI), 1, }, + { } +}; + +/** + * pch_spi_writereg() - Performs register writes + * @master: Pointer to struct spi_master. + * @idx: Register offset. + * @val: Value to be written to register. + */ +static inline void pch_spi_writereg(struct spi_master *master, int idx, u32 val) +{ + struct pch_spi_data *data = spi_master_get_devdata(master); + iowrite32(val, (data->io_remap_addr + idx)); +} + +/** + * pch_spi_readreg() - Performs register reads + * @master: Pointer to struct spi_master. + * @idx: Register offset. + */ +static inline u32 pch_spi_readreg(struct spi_master *master, int idx) +{ + struct pch_spi_data *data = spi_master_get_devdata(master); + return ioread32(data->io_remap_addr + idx); +} + +static inline void pch_spi_setclr_reg(struct spi_master *master, int idx, + u32 set, u32 clr) +{ + u32 tmp = pch_spi_readreg(master, idx); + tmp = (tmp & ~clr) | set; + pch_spi_writereg(master, idx, tmp); +} + +static void pch_spi_set_master_mode(struct spi_master *master) +{ + pch_spi_setclr_reg(master, PCH_SPCR, SPCR_MSTR_BIT, 0); +} + +/** + * pch_spi_clear_fifo() - Clears the Transmit and Receive FIFOs + * @master: Pointer to struct spi_master. + */ +static void pch_spi_clear_fifo(struct spi_master *master) +{ + pch_spi_setclr_reg(master, PCH_SPCR, SPCR_FICLR_BIT, 0); + pch_spi_setclr_reg(master, PCH_SPCR, 0, SPCR_FICLR_BIT); +} + +static void pch_spi_handler_sub(struct pch_spi_data *data, u32 reg_spsr_val, + void __iomem *io_remap_addr) +{ + u32 n_read, tx_index, rx_index, bpw_len; + u16 *pkt_rx_buffer, *pkt_tx_buff; + int read_cnt; + u32 reg_spcr_val; + void __iomem *spsr; + void __iomem *spdrr; + void __iomem *spdwr; + + spsr = io_remap_addr + PCH_SPSR; + iowrite32(reg_spsr_val, spsr); + + if (data->transfer_active) { + rx_index = data->rx_index; + tx_index = data->tx_index; + bpw_len = data->bpw_len; + pkt_rx_buffer = data->pkt_rx_buff; + pkt_tx_buff = data->pkt_tx_buff; + + spdrr = io_remap_addr + PCH_SPDRR; + spdwr = io_remap_addr + PCH_SPDWR; + + n_read = PCH_READABLE(reg_spsr_val); + + for (read_cnt = 0; (read_cnt < n_read); read_cnt++) { + pkt_rx_buffer[rx_index++] = ioread32(spdrr); + if (tx_index < bpw_len) + iowrite32(pkt_tx_buff[tx_index++], spdwr); + } + + /* disable RFI if not needed */ + if ((bpw_len - rx_index) <= PCH_MAX_FIFO_DEPTH) { + reg_spcr_val = ioread32(io_remap_addr + PCH_SPCR); + reg_spcr_val &= ~SPCR_RFIE_BIT; /* disable RFI */ + + /* reset rx threshold */ + reg_spcr_val &= ~MASK_RFIC_SPCR_BITS; + reg_spcr_val |= (PCH_RX_THOLD_MAX << SPCR_RFIC_FIELD); + + iowrite32(reg_spcr_val, (io_remap_addr + PCH_SPCR)); + } + + /* update counts */ + data->tx_index = tx_index; + data->rx_index = rx_index; + + /* if transfer complete interrupt */ + if (reg_spsr_val & SPSR_FI_BIT) { + if ((tx_index == bpw_len) && (rx_index == tx_index)) { + /* disable interrupts */ + pch_spi_setclr_reg(data->master, PCH_SPCR, 0, + PCH_ALL); + + /* transfer is completed; + inform pch_spi_process_messages */ + data->transfer_complete = true; + data->transfer_active = false; + wake_up(&data->wait); + } else { + dev_vdbg(&data->master->dev, + "%s : Transfer is not completed", + __func__); + } + } + } +} + +/** + * pch_spi_handler() - Interrupt handler + * @irq: The interrupt number. + * @dev_id: Pointer to struct pch_spi_board_data. + */ +static irqreturn_t pch_spi_handler(int irq, void *dev_id) +{ + u32 reg_spsr_val; + void __iomem *spsr; + void __iomem *io_remap_addr; + irqreturn_t ret = IRQ_NONE; + struct pch_spi_data *data = dev_id; + struct pch_spi_board_data *board_dat = data->board_dat; + + if (board_dat->suspend_sts) { + dev_dbg(&board_dat->pdev->dev, + "%s returning due to suspend\n", __func__); + return IRQ_NONE; + } + + io_remap_addr = data->io_remap_addr; + spsr = io_remap_addr + PCH_SPSR; + + reg_spsr_val = ioread32(spsr); + + if (reg_spsr_val & SPSR_ORF_BIT) { + dev_err(&board_dat->pdev->dev, "%s Over run error\n", __func__); + if (data->current_msg->complete) { + data->transfer_complete = true; + data->current_msg->status = -EIO; + data->current_msg->complete(data->current_msg->context); + data->bcurrent_msg_processing = false; + data->current_msg = NULL; + data->cur_trans = NULL; + } + } + + if (data->use_dma) + return IRQ_NONE; + + /* Check if the interrupt is for SPI device */ + if (reg_spsr_val & (SPSR_FI_BIT | SPSR_RFI_BIT)) { + pch_spi_handler_sub(data, reg_spsr_val, io_remap_addr); + ret = IRQ_HANDLED; + } + + dev_dbg(&board_dat->pdev->dev, "%s EXIT return value=%d\n", + __func__, ret); + + return ret; +} + +/** + * pch_spi_set_baud_rate() - Sets SPBR field in SPBRR + * @master: Pointer to struct spi_master. + * @speed_hz: Baud rate. + */ +static void pch_spi_set_baud_rate(struct spi_master *master, u32 speed_hz) +{ + u32 n_spbr = PCH_CLOCK_HZ / (speed_hz * 2); + + /* if baud rate is less than we can support limit it */ + if (n_spbr > PCH_MAX_SPBR) + n_spbr = PCH_MAX_SPBR; + + pch_spi_setclr_reg(master, PCH_SPBRR, n_spbr, MASK_SPBRR_SPBR_BITS); +} + +/** + * pch_spi_set_bits_per_word() - Sets SIZE field in SPBRR + * @master: Pointer to struct spi_master. + * @bits_per_word: Bits per word for SPI transfer. + */ +static void pch_spi_set_bits_per_word(struct spi_master *master, + u8 bits_per_word) +{ + if (bits_per_word == 8) + pch_spi_setclr_reg(master, PCH_SPBRR, 0, SPBRR_SIZE_BIT); + else + pch_spi_setclr_reg(master, PCH_SPBRR, SPBRR_SIZE_BIT, 0); +} + +/** + * pch_spi_setup_transfer() - Configures the PCH SPI hardware for transfer + * @spi: Pointer to struct spi_device. + */ +static void pch_spi_setup_transfer(struct spi_device *spi) +{ + u32 flags = 0; + + dev_dbg(&spi->dev, "%s SPBRR content =%x setting baud rate=%d\n", + __func__, pch_spi_readreg(spi->master, PCH_SPBRR), + spi->max_speed_hz); + pch_spi_set_baud_rate(spi->master, spi->max_speed_hz); + + /* set bits per word */ + pch_spi_set_bits_per_word(spi->master, spi->bits_per_word); + + if (!(spi->mode & SPI_LSB_FIRST)) + flags |= SPCR_LSBF_BIT; + if (spi->mode & SPI_CPOL) + flags |= SPCR_CPOL_BIT; + if (spi->mode & SPI_CPHA) + flags |= SPCR_CPHA_BIT; + pch_spi_setclr_reg(spi->master, PCH_SPCR, flags, + (SPCR_LSBF_BIT | SPCR_CPOL_BIT | SPCR_CPHA_BIT)); + + /* Clear the FIFO by toggling FICLR to 1 and back to 0 */ + pch_spi_clear_fifo(spi->master); +} + +/** + * pch_spi_reset() - Clears SPI registers + * @master: Pointer to struct spi_master. + */ +static void pch_spi_reset(struct spi_master *master) +{ + /* write 1 to reset SPI */ + pch_spi_writereg(master, PCH_SRST, 0x1); + + /* clear reset */ + pch_spi_writereg(master, PCH_SRST, 0x0); +} + +static int pch_spi_transfer(struct spi_device *pspi, struct spi_message *pmsg) +{ + + struct spi_transfer *transfer; + struct pch_spi_data *data = spi_master_get_devdata(pspi->master); + int retval; + unsigned long flags; + + spin_lock_irqsave(&data->lock, flags); + /* validate Tx/Rx buffers and Transfer length */ + list_for_each_entry(transfer, &pmsg->transfers, transfer_list) { + if (!transfer->tx_buf && !transfer->rx_buf) { + dev_err(&pspi->dev, + "%s Tx and Rx buffer NULL\n", __func__); + retval = -EINVAL; + goto err_return_spinlock; + } + + if (!transfer->len) { + dev_err(&pspi->dev, "%s Transfer length invalid\n", + __func__); + retval = -EINVAL; + goto err_return_spinlock; + } + + dev_dbg(&pspi->dev, + "%s Tx/Rx buffer valid. Transfer length valid\n", + __func__); + } + spin_unlock_irqrestore(&data->lock, flags); + + /* We won't process any messages if we have been asked to terminate */ + if (data->status == STATUS_EXITING) { + dev_err(&pspi->dev, "%s status = STATUS_EXITING.\n", __func__); + retval = -ESHUTDOWN; + goto err_out; + } + + /* If suspended ,return -EINVAL */ + if (data->board_dat->suspend_sts) { + dev_err(&pspi->dev, "%s suspend; returning EINVAL\n", __func__); + retval = -EINVAL; + goto err_out; + } + + /* set status of message */ + pmsg->actual_length = 0; + dev_dbg(&pspi->dev, "%s - pmsg->status =%d\n", __func__, pmsg->status); + + pmsg->status = -EINPROGRESS; + spin_lock_irqsave(&data->lock, flags); + /* add message to queue */ + list_add_tail(&pmsg->queue, &data->queue); + spin_unlock_irqrestore(&data->lock, flags); + + dev_dbg(&pspi->dev, "%s - Invoked list_add_tail\n", __func__); + + schedule_work(&data->work); + dev_dbg(&pspi->dev, "%s - Invoked queue work\n", __func__); + + retval = 0; + +err_out: + dev_dbg(&pspi->dev, "%s RETURN=%d\n", __func__, retval); + return retval; +err_return_spinlock: + dev_dbg(&pspi->dev, "%s RETURN=%d\n", __func__, retval); + spin_unlock_irqrestore(&data->lock, flags); + return retval; +} + +static inline void pch_spi_select_chip(struct pch_spi_data *data, + struct spi_device *pspi) +{ + if (data->current_chip != NULL) { + if (pspi->chip_select != data->n_curnt_chip) { + dev_dbg(&pspi->dev, "%s : different slave\n", __func__); + data->current_chip = NULL; + } + } + + data->current_chip = pspi; + + data->n_curnt_chip = data->current_chip->chip_select; + + dev_dbg(&pspi->dev, "%s :Invoking pch_spi_setup_transfer\n", __func__); + pch_spi_setup_transfer(pspi); +} + +static void pch_spi_set_tx(struct pch_spi_data *data, int *bpw) +{ + int size; + u32 n_writes; + int j; + struct spi_message *pmsg, *tmp; + const u8 *tx_buf; + const u16 *tx_sbuf; + + /* set baud rate if needed */ + if (data->cur_trans->speed_hz) { + dev_dbg(&data->master->dev, "%s:setting baud rate\n", __func__); + pch_spi_set_baud_rate(data->master, data->cur_trans->speed_hz); + } + + /* set bits per word if needed */ + if (data->cur_trans->bits_per_word && + (data->current_msg->spi->bits_per_word != data->cur_trans->bits_per_word)) { + dev_dbg(&data->master->dev, "%s:set bits per word\n", __func__); + pch_spi_set_bits_per_word(data->master, + data->cur_trans->bits_per_word); + *bpw = data->cur_trans->bits_per_word; + } else { + *bpw = data->current_msg->spi->bits_per_word; + } + + /* reset Tx/Rx index */ + data->tx_index = 0; + data->rx_index = 0; + + data->bpw_len = data->cur_trans->len / (*bpw / 8); + + /* find alloc size */ + size = data->cur_trans->len * sizeof(*data->pkt_tx_buff); + + /* allocate memory for pkt_tx_buff & pkt_rx_buffer */ + data->pkt_tx_buff = kzalloc(size, GFP_KERNEL); + if (data->pkt_tx_buff != NULL) { + data->pkt_rx_buff = kzalloc(size, GFP_KERNEL); + if (!data->pkt_rx_buff) { + kfree(data->pkt_tx_buff); + data->pkt_tx_buff = NULL; + } + } + + if (!data->pkt_rx_buff) { + /* flush queue and set status of all transfers to -ENOMEM */ + list_for_each_entry_safe(pmsg, tmp, data->queue.next, queue) { + pmsg->status = -ENOMEM; + + if (pmsg->complete) + pmsg->complete(pmsg->context); + + /* delete from queue */ + list_del_init(&pmsg->queue); + } + return; + } + + /* copy Tx Data */ + if (data->cur_trans->tx_buf != NULL) { + if (*bpw == 8) { + tx_buf = data->cur_trans->tx_buf; + for (j = 0; j < data->bpw_len; j++) + data->pkt_tx_buff[j] = *tx_buf++; + } else { + tx_sbuf = data->cur_trans->tx_buf; + for (j = 0; j < data->bpw_len; j++) + data->pkt_tx_buff[j] = *tx_sbuf++; + } + } + + /* if len greater than PCH_MAX_FIFO_DEPTH, write 16,else len bytes */ + n_writes = data->bpw_len; + if (n_writes > PCH_MAX_FIFO_DEPTH) + n_writes = PCH_MAX_FIFO_DEPTH; + + dev_dbg(&data->master->dev, + "\n%s:Pulling down SSN low - writing 0x2 to SSNXCR\n", + __func__); + pch_spi_writereg(data->master, PCH_SSNXCR, SSN_LOW); + + for (j = 0; j < n_writes; j++) + pch_spi_writereg(data->master, PCH_SPDWR, data->pkt_tx_buff[j]); + + /* update tx_index */ + data->tx_index = j; + + /* reset transfer complete flag */ + data->transfer_complete = false; + data->transfer_active = true; +} + +static void pch_spi_nomore_transfer(struct pch_spi_data *data) +{ + struct spi_message *pmsg, *tmp; + dev_dbg(&data->master->dev, "%s called\n", __func__); + /* Invoke complete callback + * [To the spi core..indicating end of transfer] */ + data->current_msg->status = 0; + + if (data->current_msg->complete) { + dev_dbg(&data->master->dev, + "%s:Invoking callback of SPI core\n", __func__); + data->current_msg->complete(data->current_msg->context); + } + + /* update status in global variable */ + data->bcurrent_msg_processing = false; + + dev_dbg(&data->master->dev, + "%s:data->bcurrent_msg_processing = false\n", __func__); + + data->current_msg = NULL; + data->cur_trans = NULL; + + /* check if we have items in list and not suspending + * return 1 if list empty */ + if ((list_empty(&data->queue) == 0) && + (!data->board_dat->suspend_sts) && + (data->status != STATUS_EXITING)) { + /* We have some more work to do (either there is more tranint + * bpw;sfer requests in the current message or there are + *more messages) + */ + dev_dbg(&data->master->dev, "%s:Invoke queue_work\n", __func__); + schedule_work(&data->work); + } else if (data->board_dat->suspend_sts || + data->status == STATUS_EXITING) { + dev_dbg(&data->master->dev, + "%s suspend/remove initiated, flushing queue\n", + __func__); + list_for_each_entry_safe(pmsg, tmp, data->queue.next, queue) { + pmsg->status = -EIO; + + if (pmsg->complete) + pmsg->complete(pmsg->context); + + /* delete from queue */ + list_del_init(&pmsg->queue); + } + } +} + +static void pch_spi_set_ir(struct pch_spi_data *data) +{ + /* enable interrupts, set threshold, enable SPI */ + if ((data->bpw_len) > PCH_MAX_FIFO_DEPTH) + /* set receive threshold to PCH_RX_THOLD */ + pch_spi_setclr_reg(data->master, PCH_SPCR, + PCH_RX_THOLD << SPCR_RFIC_FIELD | + SPCR_FIE_BIT | SPCR_RFIE_BIT | + SPCR_ORIE_BIT | SPCR_SPE_BIT, + MASK_RFIC_SPCR_BITS | PCH_ALL); + else + /* set receive threshold to maximum */ + pch_spi_setclr_reg(data->master, PCH_SPCR, + PCH_RX_THOLD_MAX << SPCR_RFIC_FIELD | + SPCR_FIE_BIT | SPCR_ORIE_BIT | + SPCR_SPE_BIT, + MASK_RFIC_SPCR_BITS | PCH_ALL); + + /* Wait until the transfer completes; go to sleep after + initiating the transfer. */ + dev_dbg(&data->master->dev, + "%s:waiting for transfer to get over\n", __func__); + + wait_event_interruptible(data->wait, data->transfer_complete); + + /* clear all interrupts */ + pch_spi_writereg(data->master, PCH_SPSR, + pch_spi_readreg(data->master, PCH_SPSR)); + /* Disable interrupts and SPI transfer */ + pch_spi_setclr_reg(data->master, PCH_SPCR, 0, PCH_ALL | SPCR_SPE_BIT); + /* clear FIFO */ + pch_spi_clear_fifo(data->master); +} + +static void pch_spi_copy_rx_data(struct pch_spi_data *data, int bpw) +{ + int j; + u8 *rx_buf; + u16 *rx_sbuf; + + /* copy Rx Data */ + if (!data->cur_trans->rx_buf) + return; + + if (bpw == 8) { + rx_buf = data->cur_trans->rx_buf; + for (j = 0; j < data->bpw_len; j++) + *rx_buf++ = data->pkt_rx_buff[j] & 0xFF; + } else { + rx_sbuf = data->cur_trans->rx_buf; + for (j = 0; j < data->bpw_len; j++) + *rx_sbuf++ = data->pkt_rx_buff[j]; + } +} + +static void pch_spi_copy_rx_data_for_dma(struct pch_spi_data *data, int bpw) +{ + int j; + u8 *rx_buf; + u16 *rx_sbuf; + const u8 *rx_dma_buf; + const u16 *rx_dma_sbuf; + + /* copy Rx Data */ + if (!data->cur_trans->rx_buf) + return; + + if (bpw == 8) { + rx_buf = data->cur_trans->rx_buf; + rx_dma_buf = data->dma.rx_buf_virt; + for (j = 0; j < data->bpw_len; j++) + *rx_buf++ = *rx_dma_buf++ & 0xFF; + data->cur_trans->rx_buf = rx_buf; + } else { + rx_sbuf = data->cur_trans->rx_buf; + rx_dma_sbuf = data->dma.rx_buf_virt; + for (j = 0; j < data->bpw_len; j++) + *rx_sbuf++ = *rx_dma_sbuf++; + data->cur_trans->rx_buf = rx_sbuf; + } +} + +static int pch_spi_start_transfer(struct pch_spi_data *data) +{ + struct pch_spi_dma_ctrl *dma; + unsigned long flags; + int rtn; + + dma = &data->dma; + + spin_lock_irqsave(&data->lock, flags); + + /* disable interrupts, SPI set enable */ + pch_spi_setclr_reg(data->master, PCH_SPCR, SPCR_SPE_BIT, PCH_ALL); + + spin_unlock_irqrestore(&data->lock, flags); + + /* Wait until the transfer completes; go to sleep after + initiating the transfer. */ + dev_dbg(&data->master->dev, + "%s:waiting for transfer to get over\n", __func__); + rtn = wait_event_interruptible_timeout(data->wait, + data->transfer_complete, + msecs_to_jiffies(2 * HZ)); + if (!rtn) + dev_err(&data->master->dev, + "%s wait-event timeout\n", __func__); + + dma_sync_sg_for_cpu(&data->master->dev, dma->sg_rx_p, dma->nent, + DMA_FROM_DEVICE); + + dma_sync_sg_for_cpu(&data->master->dev, dma->sg_tx_p, dma->nent, + DMA_FROM_DEVICE); + memset(data->dma.tx_buf_virt, 0, PAGE_SIZE); + + async_tx_ack(dma->desc_rx); + async_tx_ack(dma->desc_tx); + kfree(dma->sg_tx_p); + kfree(dma->sg_rx_p); + + spin_lock_irqsave(&data->lock, flags); + + /* clear fifo threshold, disable interrupts, disable SPI transfer */ + pch_spi_setclr_reg(data->master, PCH_SPCR, 0, + MASK_RFIC_SPCR_BITS | MASK_TFIC_SPCR_BITS | PCH_ALL | + SPCR_SPE_BIT); + /* clear all interrupts */ + pch_spi_writereg(data->master, PCH_SPSR, + pch_spi_readreg(data->master, PCH_SPSR)); + /* clear FIFO */ + pch_spi_clear_fifo(data->master); + + spin_unlock_irqrestore(&data->lock, flags); + + return rtn; +} + +static void pch_dma_rx_complete(void *arg) +{ + struct pch_spi_data *data = arg; + + /* transfer is completed;inform pch_spi_process_messages_dma */ + data->transfer_complete = true; + wake_up_interruptible(&data->wait); +} + +static bool pch_spi_filter(struct dma_chan *chan, void *slave) +{ + struct pch_dma_slave *param = slave; + + if ((chan->chan_id == param->chan_id) && + (param->dma_dev == chan->device->dev)) { + chan->private = param; + return true; + } else { + return false; + } +} + +static void pch_spi_request_dma(struct pch_spi_data *data, int bpw) +{ + dma_cap_mask_t mask; + struct dma_chan *chan; + struct pci_dev *dma_dev; + struct pch_dma_slave *param; + struct pch_spi_dma_ctrl *dma; + unsigned int width; + + if (bpw == 8) + width = PCH_DMA_WIDTH_1_BYTE; + else + width = PCH_DMA_WIDTH_2_BYTES; + + dma = &data->dma; + dma_cap_zero(mask); + dma_cap_set(DMA_SLAVE, mask); + + /* Get DMA's dev information */ + dma_dev = pci_get_slot(data->board_dat->pdev->bus, + PCI_DEVFN(PCI_SLOT(data->board_dat->pdev->devfn), 0)); + + /* Set Tx DMA */ + param = &dma->param_tx; + param->dma_dev = &dma_dev->dev; + param->chan_id = data->ch * 2; /* Tx = 0, 2 */ + param->tx_reg = data->io_base_addr + PCH_SPDWR; + param->width = width; + chan = dma_request_channel(mask, pch_spi_filter, param); + if (!chan) { + dev_err(&data->master->dev, + "ERROR: dma_request_channel FAILS(Tx)\n"); + data->use_dma = 0; + return; + } + dma->chan_tx = chan; + + /* Set Rx DMA */ + param = &dma->param_rx; + param->dma_dev = &dma_dev->dev; + param->chan_id = data->ch * 2 + 1; /* Rx = Tx + 1 */ + param->rx_reg = data->io_base_addr + PCH_SPDRR; + param->width = width; + chan = dma_request_channel(mask, pch_spi_filter, param); + if (!chan) { + dev_err(&data->master->dev, + "ERROR: dma_request_channel FAILS(Rx)\n"); + dma_release_channel(dma->chan_tx); + dma->chan_tx = NULL; + data->use_dma = 0; + return; + } + dma->chan_rx = chan; +} + +static void pch_spi_release_dma(struct pch_spi_data *data) +{ + struct pch_spi_dma_ctrl *dma; + + dma = &data->dma; + if (dma->chan_tx) { + dma_release_channel(dma->chan_tx); + dma->chan_tx = NULL; + } + if (dma->chan_rx) { + dma_release_channel(dma->chan_rx); + dma->chan_rx = NULL; + } +} + +static void pch_spi_handle_dma(struct pch_spi_data *data, int *bpw) +{ + const u8 *tx_buf; + const u16 *tx_sbuf; + u8 *tx_dma_buf; + u16 *tx_dma_sbuf; + struct scatterlist *sg; + struct dma_async_tx_descriptor *desc_tx; + struct dma_async_tx_descriptor *desc_rx; + int num; + int i; + int size; + int rem; + int head; + unsigned long flags; + struct pch_spi_dma_ctrl *dma; + + dma = &data->dma; + + /* set baud rate if needed */ + if (data->cur_trans->speed_hz) { + dev_dbg(&data->master->dev, "%s:setting baud rate\n", __func__); + spin_lock_irqsave(&data->lock, flags); + pch_spi_set_baud_rate(data->master, data->cur_trans->speed_hz); + spin_unlock_irqrestore(&data->lock, flags); + } + + /* set bits per word if needed */ + if (data->cur_trans->bits_per_word && + (data->current_msg->spi->bits_per_word != + data->cur_trans->bits_per_word)) { + dev_dbg(&data->master->dev, "%s:set bits per word\n", __func__); + spin_lock_irqsave(&data->lock, flags); + pch_spi_set_bits_per_word(data->master, + data->cur_trans->bits_per_word); + spin_unlock_irqrestore(&data->lock, flags); + *bpw = data->cur_trans->bits_per_word; + } else { + *bpw = data->current_msg->spi->bits_per_word; + } + data->bpw_len = data->cur_trans->len / (*bpw / 8); + + if (data->bpw_len > PCH_BUF_SIZE) { + data->bpw_len = PCH_BUF_SIZE; + data->cur_trans->len -= PCH_BUF_SIZE; + } + + /* copy Tx Data */ + if (data->cur_trans->tx_buf != NULL) { + if (*bpw == 8) { + tx_buf = data->cur_trans->tx_buf; + tx_dma_buf = dma->tx_buf_virt; + for (i = 0; i < data->bpw_len; i++) + *tx_dma_buf++ = *tx_buf++; + } else { + tx_sbuf = data->cur_trans->tx_buf; + tx_dma_sbuf = dma->tx_buf_virt; + for (i = 0; i < data->bpw_len; i++) + *tx_dma_sbuf++ = *tx_sbuf++; + } + } + + /* Calculate Rx parameter for DMA transmitting */ + if (data->bpw_len > PCH_DMA_TRANS_SIZE) { + if (data->bpw_len % PCH_DMA_TRANS_SIZE) { + num = data->bpw_len / PCH_DMA_TRANS_SIZE + 1; + rem = data->bpw_len % PCH_DMA_TRANS_SIZE; + } else { + num = data->bpw_len / PCH_DMA_TRANS_SIZE; + rem = PCH_DMA_TRANS_SIZE; + } + size = PCH_DMA_TRANS_SIZE; + } else { + num = 1; + size = data->bpw_len; + rem = data->bpw_len; + } + dev_dbg(&data->master->dev, "%s num=%d size=%d rem=%d\n", + __func__, num, size, rem); + spin_lock_irqsave(&data->lock, flags); + + /* set receive fifo threshold and transmit fifo threshold */ + pch_spi_setclr_reg(data->master, PCH_SPCR, + ((size - 1) << SPCR_RFIC_FIELD) | + (PCH_TX_THOLD << SPCR_TFIC_FIELD), + MASK_RFIC_SPCR_BITS | MASK_TFIC_SPCR_BITS); + + spin_unlock_irqrestore(&data->lock, flags); + + /* RX */ + dma->sg_rx_p = kmalloc_array(num, sizeof(*dma->sg_rx_p), GFP_ATOMIC); + if (!dma->sg_rx_p) + return; + + sg_init_table(dma->sg_rx_p, num); /* Initialize SG table */ + /* offset, length setting */ + sg = dma->sg_rx_p; + for (i = 0; i < num; i++, sg++) { + if (i == (num - 2)) { + sg->offset = size * i; + sg->offset = sg->offset * (*bpw / 8); + sg_set_page(sg, virt_to_page(dma->rx_buf_virt), rem, + sg->offset); + sg_dma_len(sg) = rem; + } else if (i == (num - 1)) { + sg->offset = size * (i - 1) + rem; + sg->offset = sg->offset * (*bpw / 8); + sg_set_page(sg, virt_to_page(dma->rx_buf_virt), size, + sg->offset); + sg_dma_len(sg) = size; + } else { + sg->offset = size * i; + sg->offset = sg->offset * (*bpw / 8); + sg_set_page(sg, virt_to_page(dma->rx_buf_virt), size, + sg->offset); + sg_dma_len(sg) = size; + } + sg_dma_address(sg) = dma->rx_buf_dma + sg->offset; + } + sg = dma->sg_rx_p; + desc_rx = dmaengine_prep_slave_sg(dma->chan_rx, sg, + num, DMA_DEV_TO_MEM, + DMA_PREP_INTERRUPT | DMA_CTRL_ACK); + if (!desc_rx) { + dev_err(&data->master->dev, + "%s:dmaengine_prep_slave_sg Failed\n", __func__); + return; + } + dma_sync_sg_for_device(&data->master->dev, sg, num, DMA_FROM_DEVICE); + desc_rx->callback = pch_dma_rx_complete; + desc_rx->callback_param = data; + dma->nent = num; + dma->desc_rx = desc_rx; + + /* Calculate Tx parameter for DMA transmitting */ + if (data->bpw_len > PCH_MAX_FIFO_DEPTH) { + head = PCH_MAX_FIFO_DEPTH - PCH_DMA_TRANS_SIZE; + if (data->bpw_len % PCH_DMA_TRANS_SIZE > 4) { + num = data->bpw_len / PCH_DMA_TRANS_SIZE + 1; + rem = data->bpw_len % PCH_DMA_TRANS_SIZE - head; + } else { + num = data->bpw_len / PCH_DMA_TRANS_SIZE; + rem = data->bpw_len % PCH_DMA_TRANS_SIZE + + PCH_DMA_TRANS_SIZE - head; + } + size = PCH_DMA_TRANS_SIZE; + } else { + num = 1; + size = data->bpw_len; + rem = data->bpw_len; + head = 0; + } + + dma->sg_tx_p = kmalloc_array(num, sizeof(*dma->sg_tx_p), GFP_ATOMIC); + if (!dma->sg_tx_p) + return; + + sg_init_table(dma->sg_tx_p, num); /* Initialize SG table */ + /* offset, length setting */ + sg = dma->sg_tx_p; + for (i = 0; i < num; i++, sg++) { + if (i == 0) { + sg->offset = 0; + sg_set_page(sg, virt_to_page(dma->tx_buf_virt), size + head, + sg->offset); + sg_dma_len(sg) = size + head; + } else if (i == (num - 1)) { + sg->offset = head + size * i; + sg->offset = sg->offset * (*bpw / 8); + sg_set_page(sg, virt_to_page(dma->tx_buf_virt), rem, + sg->offset); + sg_dma_len(sg) = rem; + } else { + sg->offset = head + size * i; + sg->offset = sg->offset * (*bpw / 8); + sg_set_page(sg, virt_to_page(dma->tx_buf_virt), size, + sg->offset); + sg_dma_len(sg) = size; + } + sg_dma_address(sg) = dma->tx_buf_dma + sg->offset; + } + sg = dma->sg_tx_p; + desc_tx = dmaengine_prep_slave_sg(dma->chan_tx, + sg, num, DMA_MEM_TO_DEV, + DMA_PREP_INTERRUPT | DMA_CTRL_ACK); + if (!desc_tx) { + dev_err(&data->master->dev, + "%s:dmaengine_prep_slave_sg Failed\n", __func__); + return; + } + dma_sync_sg_for_device(&data->master->dev, sg, num, DMA_TO_DEVICE); + desc_tx->callback = NULL; + desc_tx->callback_param = data; + dma->nent = num; + dma->desc_tx = desc_tx; + + dev_dbg(&data->master->dev, "%s:Pulling down SSN low - writing 0x2 to SSNXCR\n", __func__); + + spin_lock_irqsave(&data->lock, flags); + pch_spi_writereg(data->master, PCH_SSNXCR, SSN_LOW); + desc_rx->tx_submit(desc_rx); + desc_tx->tx_submit(desc_tx); + spin_unlock_irqrestore(&data->lock, flags); + + /* reset transfer complete flag */ + data->transfer_complete = false; +} + +static void pch_spi_process_messages(struct work_struct *pwork) +{ + struct spi_message *pmsg, *tmp; + struct pch_spi_data *data; + int bpw; + + data = container_of(pwork, struct pch_spi_data, work); + dev_dbg(&data->master->dev, "%s data initialized\n", __func__); + + spin_lock(&data->lock); + /* check if suspend has been initiated;if yes flush queue */ + if (data->board_dat->suspend_sts || (data->status == STATUS_EXITING)) { + dev_dbg(&data->master->dev, + "%s suspend/remove initiated, flushing queue\n", __func__); + list_for_each_entry_safe(pmsg, tmp, data->queue.next, queue) { + pmsg->status = -EIO; + + if (pmsg->complete) { + spin_unlock(&data->lock); + pmsg->complete(pmsg->context); + spin_lock(&data->lock); + } + + /* delete from queue */ + list_del_init(&pmsg->queue); + } + + spin_unlock(&data->lock); + return; + } + + data->bcurrent_msg_processing = true; + dev_dbg(&data->master->dev, + "%s Set data->bcurrent_msg_processing= true\n", __func__); + + /* Get the message from the queue and delete it from there. */ + data->current_msg = list_entry(data->queue.next, struct spi_message, + queue); + + list_del_init(&data->current_msg->queue); + + data->current_msg->status = 0; + + pch_spi_select_chip(data, data->current_msg->spi); + + spin_unlock(&data->lock); + + if (data->use_dma) + pch_spi_request_dma(data, + data->current_msg->spi->bits_per_word); + pch_spi_writereg(data->master, PCH_SSNXCR, SSN_NO_CONTROL); + do { + int cnt; + /* If we are already processing a message get the next + transfer structure from the message otherwise retrieve + the 1st transfer request from the message. */ + spin_lock(&data->lock); + if (data->cur_trans == NULL) { + data->cur_trans = + list_entry(data->current_msg->transfers.next, + struct spi_transfer, transfer_list); + dev_dbg(&data->master->dev, + "%s :Getting 1st transfer message\n", + __func__); + } else { + data->cur_trans = + list_entry(data->cur_trans->transfer_list.next, + struct spi_transfer, transfer_list); + dev_dbg(&data->master->dev, + "%s :Getting next transfer message\n", + __func__); + } + spin_unlock(&data->lock); + + if (!data->cur_trans->len) + goto out; + cnt = (data->cur_trans->len - 1) / PCH_BUF_SIZE + 1; + data->save_total_len = data->cur_trans->len; + if (data->use_dma) { + int i; + char *save_rx_buf = data->cur_trans->rx_buf; + for (i = 0; i < cnt; i ++) { + pch_spi_handle_dma(data, &bpw); + if (!pch_spi_start_transfer(data)) { + data->transfer_complete = true; + data->current_msg->status = -EIO; + data->current_msg->complete + (data->current_msg->context); + data->bcurrent_msg_processing = false; + data->current_msg = NULL; + data->cur_trans = NULL; + goto out; + } + pch_spi_copy_rx_data_for_dma(data, bpw); + } + data->cur_trans->rx_buf = save_rx_buf; + } else { + pch_spi_set_tx(data, &bpw); + pch_spi_set_ir(data); + pch_spi_copy_rx_data(data, bpw); + kfree(data->pkt_rx_buff); + data->pkt_rx_buff = NULL; + kfree(data->pkt_tx_buff); + data->pkt_tx_buff = NULL; + } + /* increment message count */ + data->cur_trans->len = data->save_total_len; + data->current_msg->actual_length += data->cur_trans->len; + + dev_dbg(&data->master->dev, + "%s:data->current_msg->actual_length=%d\n", + __func__, data->current_msg->actual_length); + + spi_transfer_delay_exec(data->cur_trans); + + spin_lock(&data->lock); + + /* No more transfer in this message. */ + if ((data->cur_trans->transfer_list.next) == + &(data->current_msg->transfers)) { + pch_spi_nomore_transfer(data); + } + + spin_unlock(&data->lock); + + } while (data->cur_trans != NULL); + +out: + pch_spi_writereg(data->master, PCH_SSNXCR, SSN_HIGH); + if (data->use_dma) + pch_spi_release_dma(data); +} + +static void pch_spi_free_resources(struct pch_spi_board_data *board_dat, + struct pch_spi_data *data) +{ + dev_dbg(&board_dat->pdev->dev, "%s ENTRY\n", __func__); + + flush_work(&data->work); +} + +static int pch_spi_get_resources(struct pch_spi_board_data *board_dat, + struct pch_spi_data *data) +{ + dev_dbg(&board_dat->pdev->dev, "%s ENTRY\n", __func__); + + /* reset PCH SPI h/w */ + pch_spi_reset(data->master); + dev_dbg(&board_dat->pdev->dev, + "%s pch_spi_reset invoked successfully\n", __func__); + + dev_dbg(&board_dat->pdev->dev, "%s data->irq_reg_sts=true\n", __func__); + + return 0; +} + +static void pch_free_dma_buf(struct pch_spi_board_data *board_dat, + struct pch_spi_data *data) +{ + struct pch_spi_dma_ctrl *dma; + + dma = &data->dma; + if (dma->tx_buf_dma) + dma_free_coherent(&board_dat->pdev->dev, PCH_BUF_SIZE, + dma->tx_buf_virt, dma->tx_buf_dma); + if (dma->rx_buf_dma) + dma_free_coherent(&board_dat->pdev->dev, PCH_BUF_SIZE, + dma->rx_buf_virt, dma->rx_buf_dma); +} + +static int pch_alloc_dma_buf(struct pch_spi_board_data *board_dat, + struct pch_spi_data *data) +{ + struct pch_spi_dma_ctrl *dma; + int ret; + + dma = &data->dma; + ret = 0; + /* Get Consistent memory for Tx DMA */ + dma->tx_buf_virt = dma_alloc_coherent(&board_dat->pdev->dev, + PCH_BUF_SIZE, &dma->tx_buf_dma, GFP_KERNEL); + if (!dma->tx_buf_virt) + ret = -ENOMEM; + + /* Get Consistent memory for Rx DMA */ + dma->rx_buf_virt = dma_alloc_coherent(&board_dat->pdev->dev, + PCH_BUF_SIZE, &dma->rx_buf_dma, GFP_KERNEL); + if (!dma->rx_buf_virt) + ret = -ENOMEM; + + return ret; +} + +static int pch_spi_pd_probe(struct platform_device *plat_dev) +{ + int ret; + struct spi_master *master; + struct pch_spi_board_data *board_dat = dev_get_platdata(&plat_dev->dev); + struct pch_spi_data *data; + + dev_dbg(&plat_dev->dev, "%s:debug\n", __func__); + + master = spi_alloc_master(&board_dat->pdev->dev, + sizeof(struct pch_spi_data)); + if (!master) { + dev_err(&plat_dev->dev, "spi_alloc_master[%d] failed.\n", + plat_dev->id); + return -ENOMEM; + } + + data = spi_master_get_devdata(master); + data->master = master; + + platform_set_drvdata(plat_dev, data); + + /* baseaddress + address offset) */ + data->io_base_addr = pci_resource_start(board_dat->pdev, 1) + + PCH_ADDRESS_SIZE * plat_dev->id; + data->io_remap_addr = pci_iomap(board_dat->pdev, 1, 0); + if (!data->io_remap_addr) { + dev_err(&plat_dev->dev, "%s pci_iomap failed\n", __func__); + ret = -ENOMEM; + goto err_pci_iomap; + } + data->io_remap_addr += PCH_ADDRESS_SIZE * plat_dev->id; + + dev_dbg(&plat_dev->dev, "[ch%d] remap_addr=%p\n", + plat_dev->id, data->io_remap_addr); + + /* initialize members of SPI master */ + master->num_chipselect = PCH_MAX_CS; + master->transfer = pch_spi_transfer; + master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_LSB_FIRST; + master->bits_per_word_mask = SPI_BPW_MASK(8) | SPI_BPW_MASK(16); + master->max_speed_hz = PCH_MAX_BAUDRATE; + + data->board_dat = board_dat; + data->plat_dev = plat_dev; + data->n_curnt_chip = 255; + data->status = STATUS_RUNNING; + data->ch = plat_dev->id; + data->use_dma = use_dma; + + INIT_LIST_HEAD(&data->queue); + spin_lock_init(&data->lock); + INIT_WORK(&data->work, pch_spi_process_messages); + init_waitqueue_head(&data->wait); + + ret = pch_spi_get_resources(board_dat, data); + if (ret) { + dev_err(&plat_dev->dev, "%s fail(retval=%d)\n", __func__, ret); + goto err_spi_get_resources; + } + + ret = request_irq(board_dat->pdev->irq, pch_spi_handler, + IRQF_SHARED, KBUILD_MODNAME, data); + if (ret) { + dev_err(&plat_dev->dev, + "%s request_irq failed\n", __func__); + goto err_request_irq; + } + data->irq_reg_sts = true; + + pch_spi_set_master_mode(master); + + if (use_dma) { + dev_info(&plat_dev->dev, "Use DMA for data transfers\n"); + ret = pch_alloc_dma_buf(board_dat, data); + if (ret) + goto err_spi_register_master; + } + + ret = spi_register_master(master); + if (ret != 0) { + dev_err(&plat_dev->dev, + "%s spi_register_master FAILED\n", __func__); + goto err_spi_register_master; + } + + return 0; + +err_spi_register_master: + pch_free_dma_buf(board_dat, data); + free_irq(board_dat->pdev->irq, data); +err_request_irq: + pch_spi_free_resources(board_dat, data); +err_spi_get_resources: + pci_iounmap(board_dat->pdev, data->io_remap_addr); +err_pci_iomap: + spi_master_put(master); + + return ret; +} + +static int pch_spi_pd_remove(struct platform_device *plat_dev) +{ + struct pch_spi_board_data *board_dat = dev_get_platdata(&plat_dev->dev); + struct pch_spi_data *data = platform_get_drvdata(plat_dev); + int count; + unsigned long flags; + + dev_dbg(&plat_dev->dev, "%s:[ch%d] irq=%d\n", + __func__, plat_dev->id, board_dat->pdev->irq); + + if (use_dma) + pch_free_dma_buf(board_dat, data); + + /* check for any pending messages; no action is taken if the queue + * is still full; but at least we tried. Unload anyway */ + count = 500; + spin_lock_irqsave(&data->lock, flags); + data->status = STATUS_EXITING; + while ((list_empty(&data->queue) == 0) && --count) { + dev_dbg(&board_dat->pdev->dev, "%s :queue not empty\n", + __func__); + spin_unlock_irqrestore(&data->lock, flags); + msleep(PCH_SLEEP_TIME); + spin_lock_irqsave(&data->lock, flags); + } + spin_unlock_irqrestore(&data->lock, flags); + + pch_spi_free_resources(board_dat, data); + /* disable interrupts & free IRQ */ + if (data->irq_reg_sts) { + /* disable interrupts */ + pch_spi_setclr_reg(data->master, PCH_SPCR, 0, PCH_ALL); + data->irq_reg_sts = false; + free_irq(board_dat->pdev->irq, data); + } + + pci_iounmap(board_dat->pdev, data->io_remap_addr); + spi_unregister_master(data->master); + + return 0; +} +#ifdef CONFIG_PM +static int pch_spi_pd_suspend(struct platform_device *pd_dev, + pm_message_t state) +{ + u8 count; + struct pch_spi_board_data *board_dat = dev_get_platdata(&pd_dev->dev); + struct pch_spi_data *data = platform_get_drvdata(pd_dev); + + dev_dbg(&pd_dev->dev, "%s ENTRY\n", __func__); + + if (!board_dat) { + dev_err(&pd_dev->dev, + "%s pci_get_drvdata returned NULL\n", __func__); + return -EFAULT; + } + + /* check if the current message is processed: + Only after thats done the transfer will be suspended */ + count = 255; + while ((--count) > 0) { + if (!(data->bcurrent_msg_processing)) + break; + msleep(PCH_SLEEP_TIME); + } + + /* Free IRQ */ + if (data->irq_reg_sts) { + /* disable all interrupts */ + pch_spi_setclr_reg(data->master, PCH_SPCR, 0, PCH_ALL); + pch_spi_reset(data->master); + free_irq(board_dat->pdev->irq, data); + + data->irq_reg_sts = false; + dev_dbg(&pd_dev->dev, + "%s free_irq invoked successfully.\n", __func__); + } + + return 0; +} + +static int pch_spi_pd_resume(struct platform_device *pd_dev) +{ + struct pch_spi_board_data *board_dat = dev_get_platdata(&pd_dev->dev); + struct pch_spi_data *data = platform_get_drvdata(pd_dev); + int retval; + + if (!board_dat) { + dev_err(&pd_dev->dev, + "%s pci_get_drvdata returned NULL\n", __func__); + return -EFAULT; + } + + if (!data->irq_reg_sts) { + /* register IRQ */ + retval = request_irq(board_dat->pdev->irq, pch_spi_handler, + IRQF_SHARED, KBUILD_MODNAME, data); + if (retval < 0) { + dev_err(&pd_dev->dev, + "%s request_irq failed\n", __func__); + return retval; + } + + /* reset PCH SPI h/w */ + pch_spi_reset(data->master); + pch_spi_set_master_mode(data->master); + data->irq_reg_sts = true; + } + return 0; +} +#else +#define pch_spi_pd_suspend NULL +#define pch_spi_pd_resume NULL +#endif + +static struct platform_driver pch_spi_pd_driver = { + .driver = { + .name = "pch-spi", + }, + .probe = pch_spi_pd_probe, + .remove = pch_spi_pd_remove, + .suspend = pch_spi_pd_suspend, + .resume = pch_spi_pd_resume +}; + +static int pch_spi_probe(struct pci_dev *pdev, const struct pci_device_id *id) +{ + struct pch_spi_board_data *board_dat; + struct platform_device *pd_dev = NULL; + int retval; + int i; + struct pch_pd_dev_save *pd_dev_save; + + pd_dev_save = kzalloc(sizeof(*pd_dev_save), GFP_KERNEL); + if (!pd_dev_save) + return -ENOMEM; + + board_dat = kzalloc(sizeof(*board_dat), GFP_KERNEL); + if (!board_dat) { + retval = -ENOMEM; + goto err_no_mem; + } + + retval = pci_request_regions(pdev, KBUILD_MODNAME); + if (retval) { + dev_err(&pdev->dev, "%s request_region failed\n", __func__); + goto pci_request_regions; + } + + board_dat->pdev = pdev; + board_dat->num = id->driver_data; + pd_dev_save->num = id->driver_data; + pd_dev_save->board_dat = board_dat; + + retval = pci_enable_device(pdev); + if (retval) { + dev_err(&pdev->dev, "%s pci_enable_device failed\n", __func__); + goto pci_enable_device; + } + + for (i = 0; i < board_dat->num; i++) { + pd_dev = platform_device_alloc("pch-spi", i); + if (!pd_dev) { + dev_err(&pdev->dev, "platform_device_alloc failed\n"); + retval = -ENOMEM; + goto err_platform_device; + } + pd_dev_save->pd_save[i] = pd_dev; + pd_dev->dev.parent = &pdev->dev; + + retval = platform_device_add_data(pd_dev, board_dat, + sizeof(*board_dat)); + if (retval) { + dev_err(&pdev->dev, + "platform_device_add_data failed\n"); + platform_device_put(pd_dev); + goto err_platform_device; + } + + retval = platform_device_add(pd_dev); + if (retval) { + dev_err(&pdev->dev, "platform_device_add failed\n"); + platform_device_put(pd_dev); + goto err_platform_device; + } + } + + pci_set_drvdata(pdev, pd_dev_save); + + return 0; + +err_platform_device: + while (--i >= 0) + platform_device_unregister(pd_dev_save->pd_save[i]); + pci_disable_device(pdev); +pci_enable_device: + pci_release_regions(pdev); +pci_request_regions: + kfree(board_dat); +err_no_mem: + kfree(pd_dev_save); + + return retval; +} + +static void pch_spi_remove(struct pci_dev *pdev) +{ + int i; + struct pch_pd_dev_save *pd_dev_save = pci_get_drvdata(pdev); + + dev_dbg(&pdev->dev, "%s ENTRY:pdev=%p\n", __func__, pdev); + + for (i = 0; i < pd_dev_save->num; i++) + platform_device_unregister(pd_dev_save->pd_save[i]); + + pci_disable_device(pdev); + pci_release_regions(pdev); + kfree(pd_dev_save->board_dat); + kfree(pd_dev_save); +} + +static int __maybe_unused pch_spi_suspend(struct device *dev) +{ + struct pch_pd_dev_save *pd_dev_save = dev_get_drvdata(dev); + + dev_dbg(dev, "%s ENTRY\n", __func__); + + pd_dev_save->board_dat->suspend_sts = true; + + return 0; +} + +static int __maybe_unused pch_spi_resume(struct device *dev) +{ + struct pch_pd_dev_save *pd_dev_save = dev_get_drvdata(dev); + + dev_dbg(dev, "%s ENTRY\n", __func__); + + /* set suspend status to false */ + pd_dev_save->board_dat->suspend_sts = false; + + return 0; +} + +static SIMPLE_DEV_PM_OPS(pch_spi_pm_ops, pch_spi_suspend, pch_spi_resume); + +static struct pci_driver pch_spi_pcidev_driver = { + .name = "pch_spi", + .id_table = pch_spi_pcidev_id, + .probe = pch_spi_probe, + .remove = pch_spi_remove, + .driver.pm = &pch_spi_pm_ops, +}; + +static int __init pch_spi_init(void) +{ + int ret; + ret = platform_driver_register(&pch_spi_pd_driver); + if (ret) + return ret; + + ret = pci_register_driver(&pch_spi_pcidev_driver); + if (ret) { + platform_driver_unregister(&pch_spi_pd_driver); + return ret; + } + + return 0; +} +module_init(pch_spi_init); + +static void __exit pch_spi_exit(void) +{ + pci_unregister_driver(&pch_spi_pcidev_driver); + platform_driver_unregister(&pch_spi_pd_driver); +} +module_exit(pch_spi_exit); + +module_param(use_dma, int, 0644); +MODULE_PARM_DESC(use_dma, + "to use DMA for data transfers pass 1 else 0; default 1"); + +MODULE_LICENSE("GPL"); +MODULE_DESCRIPTION("Intel EG20T PCH/LAPIS Semiconductor ML7xxx IOH SPI Driver"); +MODULE_DEVICE_TABLE(pci, pch_spi_pcidev_id); + diff --git a/drivers/spi/spi-txx9.c b/drivers/spi/spi-txx9.c new file mode 100644 index 000000000..3606232f1 --- /dev/null +++ b/drivers/spi/spi-txx9.c @@ -0,0 +1,477 @@ +/* + * TXx9 SPI controller driver. + * + * Based on linux/arch/mips/tx4938/toshiba_rbtx4938/spi_txx9.c + * Copyright (C) 2000-2001 Toshiba Corporation + * + * 2003-2005 (c) MontaVista Software, Inc. This file is licensed under the + * terms of the GNU General Public License version 2. This program is + * licensed "as is" without any warranty of any kind, whether express + * or implied. + * + * Support for TX4938 in 2.6 - Manish Lachwani (mlachwani@mvista.com) + * + * Convert to generic SPI framework - Atsushi Nemoto (anemo@mba.ocn.ne.jp) + */ +#include <linux/init.h> +#include <linux/delay.h> +#include <linux/errno.h> +#include <linux/interrupt.h> +#include <linux/platform_device.h> +#include <linux/sched.h> +#include <linux/spinlock.h> +#include <linux/workqueue.h> +#include <linux/spi/spi.h> +#include <linux/err.h> +#include <linux/clk.h> +#include <linux/io.h> +#include <linux/module.h> +#include <linux/gpio/machine.h> +#include <linux/gpio/consumer.h> + + +#define SPI_FIFO_SIZE 4 +#define SPI_MAX_DIVIDER 0xff /* Max. value for SPCR1.SER */ +#define SPI_MIN_DIVIDER 1 /* Min. value for SPCR1.SER */ + +#define TXx9_SPMCR 0x00 +#define TXx9_SPCR0 0x04 +#define TXx9_SPCR1 0x08 +#define TXx9_SPFS 0x0c +#define TXx9_SPSR 0x14 +#define TXx9_SPDR 0x18 + +/* SPMCR : SPI Master Control */ +#define TXx9_SPMCR_OPMODE 0xc0 +#define TXx9_SPMCR_CONFIG 0x40 +#define TXx9_SPMCR_ACTIVE 0x80 +#define TXx9_SPMCR_SPSTP 0x02 +#define TXx9_SPMCR_BCLR 0x01 + +/* SPCR0 : SPI Control 0 */ +#define TXx9_SPCR0_TXIFL_MASK 0xc000 +#define TXx9_SPCR0_RXIFL_MASK 0x3000 +#define TXx9_SPCR0_SIDIE 0x0800 +#define TXx9_SPCR0_SOEIE 0x0400 +#define TXx9_SPCR0_RBSIE 0x0200 +#define TXx9_SPCR0_TBSIE 0x0100 +#define TXx9_SPCR0_IFSPSE 0x0010 +#define TXx9_SPCR0_SBOS 0x0004 +#define TXx9_SPCR0_SPHA 0x0002 +#define TXx9_SPCR0_SPOL 0x0001 + +/* SPSR : SPI Status */ +#define TXx9_SPSR_TBSI 0x8000 +#define TXx9_SPSR_RBSI 0x4000 +#define TXx9_SPSR_TBS_MASK 0x3800 +#define TXx9_SPSR_RBS_MASK 0x0700 +#define TXx9_SPSR_SPOE 0x0080 +#define TXx9_SPSR_IFSD 0x0008 +#define TXx9_SPSR_SIDLE 0x0004 +#define TXx9_SPSR_STRDY 0x0002 +#define TXx9_SPSR_SRRDY 0x0001 + + +struct txx9spi { + struct work_struct work; + spinlock_t lock; /* protect 'queue' */ + struct list_head queue; + wait_queue_head_t waitq; + void __iomem *membase; + int baseclk; + struct clk *clk; + struct gpio_desc *last_chipselect; + int last_chipselect_val; +}; + +static u32 txx9spi_rd(struct txx9spi *c, int reg) +{ + return __raw_readl(c->membase + reg); +} +static void txx9spi_wr(struct txx9spi *c, u32 val, int reg) +{ + __raw_writel(val, c->membase + reg); +} + +static void txx9spi_cs_func(struct spi_device *spi, struct txx9spi *c, + int on, unsigned int cs_delay) +{ + /* + * The GPIO descriptor will track polarity inversion inside + * gpiolib. + */ + if (on) { + /* deselect the chip with cs_change hint in last transfer */ + if (c->last_chipselect) + gpiod_set_value(c->last_chipselect, + !c->last_chipselect_val); + c->last_chipselect = spi->cs_gpiod; + c->last_chipselect_val = on; + } else { + c->last_chipselect = NULL; + ndelay(cs_delay); /* CS Hold Time */ + } + gpiod_set_value(spi->cs_gpiod, on); + ndelay(cs_delay); /* CS Setup Time / CS Recovery Time */ +} + +static int txx9spi_setup(struct spi_device *spi) +{ + struct txx9spi *c = spi_master_get_devdata(spi->master); + + if (!spi->max_speed_hz) + return -EINVAL; + + /* deselect chip */ + spin_lock(&c->lock); + txx9spi_cs_func(spi, c, 0, (NSEC_PER_SEC / 2) / spi->max_speed_hz); + spin_unlock(&c->lock); + + return 0; +} + +static irqreturn_t txx9spi_interrupt(int irq, void *dev_id) +{ + struct txx9spi *c = dev_id; + + /* disable rx intr */ + txx9spi_wr(c, txx9spi_rd(c, TXx9_SPCR0) & ~TXx9_SPCR0_RBSIE, + TXx9_SPCR0); + wake_up(&c->waitq); + return IRQ_HANDLED; +} + +static void txx9spi_work_one(struct txx9spi *c, struct spi_message *m) +{ + struct spi_device *spi = m->spi; + struct spi_transfer *t; + unsigned int cs_delay; + unsigned int cs_change = 1; + int status = 0; + u32 mcr; + u32 prev_speed_hz = 0; + u8 prev_bits_per_word = 0; + + /* CS setup/hold/recovery time in nsec */ + cs_delay = 100 + (NSEC_PER_SEC / 2) / spi->max_speed_hz; + + mcr = txx9spi_rd(c, TXx9_SPMCR); + if (unlikely((mcr & TXx9_SPMCR_OPMODE) == TXx9_SPMCR_ACTIVE)) { + dev_err(&spi->dev, "Bad mode.\n"); + status = -EIO; + goto exit; + } + mcr &= ~(TXx9_SPMCR_OPMODE | TXx9_SPMCR_SPSTP | TXx9_SPMCR_BCLR); + + /* enter config mode */ + txx9spi_wr(c, mcr | TXx9_SPMCR_CONFIG | TXx9_SPMCR_BCLR, TXx9_SPMCR); + txx9spi_wr(c, TXx9_SPCR0_SBOS + | ((spi->mode & SPI_CPOL) ? TXx9_SPCR0_SPOL : 0) + | ((spi->mode & SPI_CPHA) ? TXx9_SPCR0_SPHA : 0) + | 0x08, + TXx9_SPCR0); + + list_for_each_entry(t, &m->transfers, transfer_list) { + const void *txbuf = t->tx_buf; + void *rxbuf = t->rx_buf; + u32 data; + unsigned int len = t->len; + unsigned int wsize; + u32 speed_hz = t->speed_hz; + u8 bits_per_word = t->bits_per_word; + + wsize = bits_per_word >> 3; /* in bytes */ + + if (prev_speed_hz != speed_hz + || prev_bits_per_word != bits_per_word) { + int n = DIV_ROUND_UP(c->baseclk, speed_hz) - 1; + + n = clamp(n, SPI_MIN_DIVIDER, SPI_MAX_DIVIDER); + /* enter config mode */ + txx9spi_wr(c, mcr | TXx9_SPMCR_CONFIG | TXx9_SPMCR_BCLR, + TXx9_SPMCR); + txx9spi_wr(c, (n << 8) | bits_per_word, TXx9_SPCR1); + /* enter active mode */ + txx9spi_wr(c, mcr | TXx9_SPMCR_ACTIVE, TXx9_SPMCR); + + prev_speed_hz = speed_hz; + prev_bits_per_word = bits_per_word; + } + + if (cs_change) + txx9spi_cs_func(spi, c, 1, cs_delay); + cs_change = t->cs_change; + while (len) { + unsigned int count = SPI_FIFO_SIZE; + int i; + u32 cr0; + + if (len < count * wsize) + count = len / wsize; + /* now tx must be idle... */ + while (!(txx9spi_rd(c, TXx9_SPSR) & TXx9_SPSR_SIDLE)) + cpu_relax(); + cr0 = txx9spi_rd(c, TXx9_SPCR0); + cr0 &= ~TXx9_SPCR0_RXIFL_MASK; + cr0 |= (count - 1) << 12; + /* enable rx intr */ + cr0 |= TXx9_SPCR0_RBSIE; + txx9spi_wr(c, cr0, TXx9_SPCR0); + /* send */ + for (i = 0; i < count; i++) { + if (txbuf) { + data = (wsize == 1) + ? *(const u8 *)txbuf + : *(const u16 *)txbuf; + txx9spi_wr(c, data, TXx9_SPDR); + txbuf += wsize; + } else + txx9spi_wr(c, 0, TXx9_SPDR); + } + /* wait all rx data */ + wait_event(c->waitq, + txx9spi_rd(c, TXx9_SPSR) & TXx9_SPSR_RBSI); + /* receive */ + for (i = 0; i < count; i++) { + data = txx9spi_rd(c, TXx9_SPDR); + if (rxbuf) { + if (wsize == 1) + *(u8 *)rxbuf = data; + else + *(u16 *)rxbuf = data; + rxbuf += wsize; + } + } + len -= count * wsize; + } + m->actual_length += t->len; + spi_transfer_delay_exec(t); + + if (!cs_change) + continue; + if (t->transfer_list.next == &m->transfers) + break; + /* sometimes a short mid-message deselect of the chip + * may be needed to terminate a mode or command + */ + txx9spi_cs_func(spi, c, 0, cs_delay); + } + +exit: + m->status = status; + if (m->complete) + m->complete(m->context); + + /* normally deactivate chipselect ... unless no error and + * cs_change has hinted that the next message will probably + * be for this chip too. + */ + if (!(status == 0 && cs_change)) + txx9spi_cs_func(spi, c, 0, cs_delay); + + /* enter config mode */ + txx9spi_wr(c, mcr | TXx9_SPMCR_CONFIG | TXx9_SPMCR_BCLR, TXx9_SPMCR); +} + +static void txx9spi_work(struct work_struct *work) +{ + struct txx9spi *c = container_of(work, struct txx9spi, work); + unsigned long flags; + + spin_lock_irqsave(&c->lock, flags); + while (!list_empty(&c->queue)) { + struct spi_message *m; + + m = container_of(c->queue.next, struct spi_message, queue); + list_del_init(&m->queue); + spin_unlock_irqrestore(&c->lock, flags); + + txx9spi_work_one(c, m); + + spin_lock_irqsave(&c->lock, flags); + } + spin_unlock_irqrestore(&c->lock, flags); +} + +static int txx9spi_transfer(struct spi_device *spi, struct spi_message *m) +{ + struct spi_master *master = spi->master; + struct txx9spi *c = spi_master_get_devdata(master); + struct spi_transfer *t; + unsigned long flags; + + m->actual_length = 0; + + /* check each transfer's parameters */ + list_for_each_entry(t, &m->transfers, transfer_list) { + if (!t->tx_buf && !t->rx_buf && t->len) + return -EINVAL; + } + + spin_lock_irqsave(&c->lock, flags); + list_add_tail(&m->queue, &c->queue); + schedule_work(&c->work); + spin_unlock_irqrestore(&c->lock, flags); + + return 0; +} + +/* + * Chip select uses GPIO only, further the driver is using the chip select + * numer (from the device tree "reg" property, and this can only come from + * device tree since this i MIPS and there is no way to pass platform data) as + * the GPIO number. As the platform has only one GPIO controller (the txx9 GPIO + * chip) it is thus using the chip select number as an offset into that chip. + * This chip has a maximum of 16 GPIOs 0..15 and this is what all platforms + * register. + * + * We modernized this behaviour by explicitly converting that offset to an + * offset on the GPIO chip using a GPIO descriptor machine table of the same + * size as the txx9 GPIO chip with a 1-to-1 mapping of chip select to GPIO + * offset. + * + * This is admittedly a hack, but it is countering the hack of using "reg" to + * contain a GPIO offset when it should be using "cs-gpios" as the SPI bindings + * state. + */ +static struct gpiod_lookup_table txx9spi_cs_gpio_table = { + .dev_id = "spi0", + .table = { + GPIO_LOOKUP_IDX("TXx9", 0, "cs", 0, GPIO_ACTIVE_LOW), + GPIO_LOOKUP_IDX("TXx9", 1, "cs", 1, GPIO_ACTIVE_LOW), + GPIO_LOOKUP_IDX("TXx9", 2, "cs", 2, GPIO_ACTIVE_LOW), + GPIO_LOOKUP_IDX("TXx9", 3, "cs", 3, GPIO_ACTIVE_LOW), + GPIO_LOOKUP_IDX("TXx9", 4, "cs", 4, GPIO_ACTIVE_LOW), + GPIO_LOOKUP_IDX("TXx9", 5, "cs", 5, GPIO_ACTIVE_LOW), + GPIO_LOOKUP_IDX("TXx9", 6, "cs", 6, GPIO_ACTIVE_LOW), + GPIO_LOOKUP_IDX("TXx9", 7, "cs", 7, GPIO_ACTIVE_LOW), + GPIO_LOOKUP_IDX("TXx9", 8, "cs", 8, GPIO_ACTIVE_LOW), + GPIO_LOOKUP_IDX("TXx9", 9, "cs", 9, GPIO_ACTIVE_LOW), + GPIO_LOOKUP_IDX("TXx9", 10, "cs", 10, GPIO_ACTIVE_LOW), + GPIO_LOOKUP_IDX("TXx9", 11, "cs", 11, GPIO_ACTIVE_LOW), + GPIO_LOOKUP_IDX("TXx9", 12, "cs", 12, GPIO_ACTIVE_LOW), + GPIO_LOOKUP_IDX("TXx9", 13, "cs", 13, GPIO_ACTIVE_LOW), + GPIO_LOOKUP_IDX("TXx9", 14, "cs", 14, GPIO_ACTIVE_LOW), + GPIO_LOOKUP_IDX("TXx9", 15, "cs", 15, GPIO_ACTIVE_LOW), + { }, + }, +}; + +static int txx9spi_probe(struct platform_device *dev) +{ + struct spi_master *master; + struct txx9spi *c; + struct resource *res; + int ret = -ENODEV; + u32 mcr; + int irq; + + master = spi_alloc_master(&dev->dev, sizeof(*c)); + if (!master) + return ret; + c = spi_master_get_devdata(master); + platform_set_drvdata(dev, master); + + INIT_WORK(&c->work, txx9spi_work); + spin_lock_init(&c->lock); + INIT_LIST_HEAD(&c->queue); + init_waitqueue_head(&c->waitq); + + c->clk = devm_clk_get(&dev->dev, "spi-baseclk"); + if (IS_ERR(c->clk)) { + ret = PTR_ERR(c->clk); + c->clk = NULL; + goto exit; + } + ret = clk_prepare_enable(c->clk); + if (ret) { + c->clk = NULL; + goto exit; + } + c->baseclk = clk_get_rate(c->clk); + master->min_speed_hz = DIV_ROUND_UP(c->baseclk, SPI_MAX_DIVIDER + 1); + master->max_speed_hz = c->baseclk / (SPI_MIN_DIVIDER + 1); + + res = platform_get_resource(dev, IORESOURCE_MEM, 0); + c->membase = devm_ioremap_resource(&dev->dev, res); + if (IS_ERR(c->membase)) + goto exit_busy; + + /* enter config mode */ + mcr = txx9spi_rd(c, TXx9_SPMCR); + mcr &= ~(TXx9_SPMCR_OPMODE | TXx9_SPMCR_SPSTP | TXx9_SPMCR_BCLR); + txx9spi_wr(c, mcr | TXx9_SPMCR_CONFIG | TXx9_SPMCR_BCLR, TXx9_SPMCR); + + irq = platform_get_irq(dev, 0); + if (irq < 0) + goto exit_busy; + ret = devm_request_irq(&dev->dev, irq, txx9spi_interrupt, 0, + "spi_txx9", c); + if (ret) + goto exit; + + c->last_chipselect = NULL; + + dev_info(&dev->dev, "at %#llx, irq %d, %dMHz\n", + (unsigned long long)res->start, irq, + (c->baseclk + 500000) / 1000000); + + gpiod_add_lookup_table(&txx9spi_cs_gpio_table); + + /* the spi->mode bits understood by this driver: */ + master->mode_bits = SPI_CS_HIGH | SPI_CPOL | SPI_CPHA; + + master->bus_num = dev->id; + master->setup = txx9spi_setup; + master->transfer = txx9spi_transfer; + master->num_chipselect = (u16)UINT_MAX; /* any GPIO numbers */ + master->bits_per_word_mask = SPI_BPW_MASK(8) | SPI_BPW_MASK(16); + master->use_gpio_descriptors = true; + + ret = devm_spi_register_master(&dev->dev, master); + if (ret) + goto exit; + return 0; +exit_busy: + ret = -EBUSY; +exit: + clk_disable_unprepare(c->clk); + spi_master_put(master); + return ret; +} + +static int txx9spi_remove(struct platform_device *dev) +{ + struct spi_master *master = platform_get_drvdata(dev); + struct txx9spi *c = spi_master_get_devdata(master); + + flush_work(&c->work); + clk_disable_unprepare(c->clk); + return 0; +} + +/* work with hotplug and coldplug */ +MODULE_ALIAS("platform:spi_txx9"); + +static struct platform_driver txx9spi_driver = { + .probe = txx9spi_probe, + .remove = txx9spi_remove, + .driver = { + .name = "spi_txx9", + }, +}; + +static int __init txx9spi_init(void) +{ + return platform_driver_register(&txx9spi_driver); +} +subsys_initcall(txx9spi_init); + +static void __exit txx9spi_exit(void) +{ + platform_driver_unregister(&txx9spi_driver); +} +module_exit(txx9spi_exit); + +MODULE_DESCRIPTION("TXx9 SPI Driver"); +MODULE_LICENSE("GPL"); diff --git a/drivers/spi/spi-uniphier.c b/drivers/spi/spi-uniphier.c new file mode 100644 index 000000000..ad0088e39 --- /dev/null +++ b/drivers/spi/spi-uniphier.c @@ -0,0 +1,812 @@ +// SPDX-License-Identifier: GPL-2.0 +// spi-uniphier.c - Socionext UniPhier SPI controller driver +// Copyright 2012 Panasonic Corporation +// Copyright 2016-2018 Socionext Inc. + +#include <linux/kernel.h> +#include <linux/bitfield.h> +#include <linux/bitops.h> +#include <linux/clk.h> +#include <linux/delay.h> +#include <linux/dmaengine.h> +#include <linux/interrupt.h> +#include <linux/io.h> +#include <linux/module.h> +#include <linux/platform_device.h> +#include <linux/spi/spi.h> + +#include <asm/unaligned.h> + +#define SSI_TIMEOUT_MS 2000 +#define SSI_POLL_TIMEOUT_US 200 +#define SSI_MAX_CLK_DIVIDER 254 +#define SSI_MIN_CLK_DIVIDER 4 + +struct uniphier_spi_priv { + void __iomem *base; + dma_addr_t base_dma_addr; + struct clk *clk; + struct spi_master *master; + struct completion xfer_done; + + int error; + unsigned int tx_bytes; + unsigned int rx_bytes; + const u8 *tx_buf; + u8 *rx_buf; + atomic_t dma_busy; + + bool is_save_param; + u8 bits_per_word; + u16 mode; + u32 speed_hz; +}; + +#define SSI_CTL 0x00 +#define SSI_CTL_EN BIT(0) + +#define SSI_CKS 0x04 +#define SSI_CKS_CKRAT_MASK GENMASK(7, 0) +#define SSI_CKS_CKPHS BIT(14) +#define SSI_CKS_CKINIT BIT(13) +#define SSI_CKS_CKDLY BIT(12) + +#define SSI_TXWDS 0x08 +#define SSI_TXWDS_WDLEN_MASK GENMASK(13, 8) +#define SSI_TXWDS_TDTF_MASK GENMASK(7, 6) +#define SSI_TXWDS_DTLEN_MASK GENMASK(5, 0) + +#define SSI_RXWDS 0x0c +#define SSI_RXWDS_DTLEN_MASK GENMASK(5, 0) + +#define SSI_FPS 0x10 +#define SSI_FPS_FSPOL BIT(15) +#define SSI_FPS_FSTRT BIT(14) + +#define SSI_SR 0x14 +#define SSI_SR_BUSY BIT(7) +#define SSI_SR_RNE BIT(0) + +#define SSI_IE 0x18 +#define SSI_IE_TCIE BIT(4) +#define SSI_IE_RCIE BIT(3) +#define SSI_IE_TXRE BIT(2) +#define SSI_IE_RXRE BIT(1) +#define SSI_IE_RORIE BIT(0) +#define SSI_IE_ALL_MASK GENMASK(4, 0) + +#define SSI_IS 0x1c +#define SSI_IS_RXRS BIT(9) +#define SSI_IS_RCID BIT(3) +#define SSI_IS_RORID BIT(0) + +#define SSI_IC 0x1c +#define SSI_IC_TCIC BIT(4) +#define SSI_IC_RCIC BIT(3) +#define SSI_IC_RORIC BIT(0) + +#define SSI_FC 0x20 +#define SSI_FC_TXFFL BIT(12) +#define SSI_FC_TXFTH_MASK GENMASK(11, 8) +#define SSI_FC_RXFFL BIT(4) +#define SSI_FC_RXFTH_MASK GENMASK(3, 0) + +#define SSI_TXDR 0x24 +#define SSI_RXDR 0x24 + +#define SSI_FIFO_DEPTH 8U +#define SSI_FIFO_BURST_NUM 1 + +#define SSI_DMA_RX_BUSY BIT(1) +#define SSI_DMA_TX_BUSY BIT(0) + +static inline unsigned int bytes_per_word(unsigned int bits) +{ + return bits <= 8 ? 1 : (bits <= 16 ? 2 : 4); +} + +static inline void uniphier_spi_irq_enable(struct uniphier_spi_priv *priv, + u32 mask) +{ + u32 val; + + val = readl(priv->base + SSI_IE); + val |= mask; + writel(val, priv->base + SSI_IE); +} + +static inline void uniphier_spi_irq_disable(struct uniphier_spi_priv *priv, + u32 mask) +{ + u32 val; + + val = readl(priv->base + SSI_IE); + val &= ~mask; + writel(val, priv->base + SSI_IE); +} + +static void uniphier_spi_set_mode(struct spi_device *spi) +{ + struct uniphier_spi_priv *priv = spi_master_get_devdata(spi->master); + u32 val1, val2; + + /* + * clock setting + * CKPHS capture timing. 0:rising edge, 1:falling edge + * CKINIT clock initial level. 0:low, 1:high + * CKDLY clock delay. 0:no delay, 1:delay depending on FSTRT + * (FSTRT=0: 1 clock, FSTRT=1: 0.5 clock) + * + * frame setting + * FSPOL frame signal porarity. 0: low, 1: high + * FSTRT start frame timing + * 0: rising edge of clock, 1: falling edge of clock + */ + switch (spi->mode & (SPI_CPOL | SPI_CPHA)) { + case SPI_MODE_0: + /* CKPHS=1, CKINIT=0, CKDLY=1, FSTRT=0 */ + val1 = SSI_CKS_CKPHS | SSI_CKS_CKDLY; + val2 = 0; + break; + case SPI_MODE_1: + /* CKPHS=0, CKINIT=0, CKDLY=0, FSTRT=1 */ + val1 = 0; + val2 = SSI_FPS_FSTRT; + break; + case SPI_MODE_2: + /* CKPHS=0, CKINIT=1, CKDLY=1, FSTRT=1 */ + val1 = SSI_CKS_CKINIT | SSI_CKS_CKDLY; + val2 = SSI_FPS_FSTRT; + break; + case SPI_MODE_3: + /* CKPHS=1, CKINIT=1, CKDLY=0, FSTRT=0 */ + val1 = SSI_CKS_CKPHS | SSI_CKS_CKINIT; + val2 = 0; + break; + } + + if (!(spi->mode & SPI_CS_HIGH)) + val2 |= SSI_FPS_FSPOL; + + writel(val1, priv->base + SSI_CKS); + writel(val2, priv->base + SSI_FPS); + + val1 = 0; + if (spi->mode & SPI_LSB_FIRST) + val1 |= FIELD_PREP(SSI_TXWDS_TDTF_MASK, 1); + writel(val1, priv->base + SSI_TXWDS); + writel(val1, priv->base + SSI_RXWDS); +} + +static void uniphier_spi_set_transfer_size(struct spi_device *spi, int size) +{ + struct uniphier_spi_priv *priv = spi_master_get_devdata(spi->master); + u32 val; + + val = readl(priv->base + SSI_TXWDS); + val &= ~(SSI_TXWDS_WDLEN_MASK | SSI_TXWDS_DTLEN_MASK); + val |= FIELD_PREP(SSI_TXWDS_WDLEN_MASK, size); + val |= FIELD_PREP(SSI_TXWDS_DTLEN_MASK, size); + writel(val, priv->base + SSI_TXWDS); + + val = readl(priv->base + SSI_RXWDS); + val &= ~SSI_RXWDS_DTLEN_MASK; + val |= FIELD_PREP(SSI_RXWDS_DTLEN_MASK, size); + writel(val, priv->base + SSI_RXWDS); +} + +static void uniphier_spi_set_baudrate(struct spi_device *spi, + unsigned int speed) +{ + struct uniphier_spi_priv *priv = spi_master_get_devdata(spi->master); + u32 val, ckdiv; + + /* + * the supported rates are even numbers from 4 to 254. (4,6,8...254) + * round up as we look for equal or less speed + */ + ckdiv = DIV_ROUND_UP(clk_get_rate(priv->clk), speed); + ckdiv = round_up(ckdiv, 2); + + val = readl(priv->base + SSI_CKS); + val &= ~SSI_CKS_CKRAT_MASK; + val |= ckdiv & SSI_CKS_CKRAT_MASK; + writel(val, priv->base + SSI_CKS); +} + +static void uniphier_spi_setup_transfer(struct spi_device *spi, + struct spi_transfer *t) +{ + struct uniphier_spi_priv *priv = spi_master_get_devdata(spi->master); + u32 val; + + priv->error = 0; + priv->tx_buf = t->tx_buf; + priv->rx_buf = t->rx_buf; + priv->tx_bytes = priv->rx_bytes = t->len; + + if (!priv->is_save_param || priv->mode != spi->mode) { + uniphier_spi_set_mode(spi); + priv->mode = spi->mode; + priv->is_save_param = false; + } + + if (!priv->is_save_param || priv->bits_per_word != t->bits_per_word) { + uniphier_spi_set_transfer_size(spi, t->bits_per_word); + priv->bits_per_word = t->bits_per_word; + } + + if (!priv->is_save_param || priv->speed_hz != t->speed_hz) { + uniphier_spi_set_baudrate(spi, t->speed_hz); + priv->speed_hz = t->speed_hz; + } + + priv->is_save_param = true; + + /* reset FIFOs */ + val = SSI_FC_TXFFL | SSI_FC_RXFFL; + writel(val, priv->base + SSI_FC); +} + +static void uniphier_spi_send(struct uniphier_spi_priv *priv) +{ + int wsize; + u32 val = 0; + + wsize = min(bytes_per_word(priv->bits_per_word), priv->tx_bytes); + priv->tx_bytes -= wsize; + + if (priv->tx_buf) { + switch (wsize) { + case 1: + val = *priv->tx_buf; + break; + case 2: + val = get_unaligned_le16(priv->tx_buf); + break; + case 4: + val = get_unaligned_le32(priv->tx_buf); + break; + } + + priv->tx_buf += wsize; + } + + writel(val, priv->base + SSI_TXDR); +} + +static void uniphier_spi_recv(struct uniphier_spi_priv *priv) +{ + int rsize; + u32 val; + + rsize = min(bytes_per_word(priv->bits_per_word), priv->rx_bytes); + priv->rx_bytes -= rsize; + + val = readl(priv->base + SSI_RXDR); + + if (priv->rx_buf) { + switch (rsize) { + case 1: + *priv->rx_buf = val; + break; + case 2: + put_unaligned_le16(val, priv->rx_buf); + break; + case 4: + put_unaligned_le32(val, priv->rx_buf); + break; + } + + priv->rx_buf += rsize; + } +} + +static void uniphier_spi_set_fifo_threshold(struct uniphier_spi_priv *priv, + unsigned int threshold) +{ + u32 val; + + val = readl(priv->base + SSI_FC); + val &= ~(SSI_FC_TXFTH_MASK | SSI_FC_RXFTH_MASK); + val |= FIELD_PREP(SSI_FC_TXFTH_MASK, SSI_FIFO_DEPTH - threshold); + val |= FIELD_PREP(SSI_FC_RXFTH_MASK, threshold); + writel(val, priv->base + SSI_FC); +} + +static void uniphier_spi_fill_tx_fifo(struct uniphier_spi_priv *priv) +{ + unsigned int fifo_threshold, fill_words; + unsigned int bpw = bytes_per_word(priv->bits_per_word); + + fifo_threshold = DIV_ROUND_UP(priv->rx_bytes, bpw); + fifo_threshold = min(fifo_threshold, SSI_FIFO_DEPTH); + + uniphier_spi_set_fifo_threshold(priv, fifo_threshold); + + fill_words = fifo_threshold - + DIV_ROUND_UP(priv->rx_bytes - priv->tx_bytes, bpw); + + while (fill_words--) + uniphier_spi_send(priv); +} + +static void uniphier_spi_set_cs(struct spi_device *spi, bool enable) +{ + struct uniphier_spi_priv *priv = spi_master_get_devdata(spi->master); + u32 val; + + val = readl(priv->base + SSI_FPS); + + if (enable) + val |= SSI_FPS_FSPOL; + else + val &= ~SSI_FPS_FSPOL; + + writel(val, priv->base + SSI_FPS); +} + +static bool uniphier_spi_can_dma(struct spi_master *master, + struct spi_device *spi, + struct spi_transfer *t) +{ + struct uniphier_spi_priv *priv = spi_master_get_devdata(master); + unsigned int bpw = bytes_per_word(priv->bits_per_word); + + if ((!master->dma_tx && !master->dma_rx) + || (!master->dma_tx && t->tx_buf) + || (!master->dma_rx && t->rx_buf)) + return false; + + return DIV_ROUND_UP(t->len, bpw) > SSI_FIFO_DEPTH; +} + +static void uniphier_spi_dma_rxcb(void *data) +{ + struct spi_master *master = data; + struct uniphier_spi_priv *priv = spi_master_get_devdata(master); + int state = atomic_fetch_andnot(SSI_DMA_RX_BUSY, &priv->dma_busy); + + uniphier_spi_irq_disable(priv, SSI_IE_RXRE); + + if (!(state & SSI_DMA_TX_BUSY)) + spi_finalize_current_transfer(master); +} + +static void uniphier_spi_dma_txcb(void *data) +{ + struct spi_master *master = data; + struct uniphier_spi_priv *priv = spi_master_get_devdata(master); + int state = atomic_fetch_andnot(SSI_DMA_TX_BUSY, &priv->dma_busy); + + uniphier_spi_irq_disable(priv, SSI_IE_TXRE); + + if (!(state & SSI_DMA_RX_BUSY)) + spi_finalize_current_transfer(master); +} + +static int uniphier_spi_transfer_one_dma(struct spi_master *master, + struct spi_device *spi, + struct spi_transfer *t) +{ + struct uniphier_spi_priv *priv = spi_master_get_devdata(master); + struct dma_async_tx_descriptor *rxdesc = NULL, *txdesc = NULL; + int buswidth; + + atomic_set(&priv->dma_busy, 0); + + uniphier_spi_set_fifo_threshold(priv, SSI_FIFO_BURST_NUM); + + if (priv->bits_per_word <= 8) + buswidth = DMA_SLAVE_BUSWIDTH_1_BYTE; + else if (priv->bits_per_word <= 16) + buswidth = DMA_SLAVE_BUSWIDTH_2_BYTES; + else + buswidth = DMA_SLAVE_BUSWIDTH_4_BYTES; + + if (priv->rx_buf) { + struct dma_slave_config rxconf = { + .direction = DMA_DEV_TO_MEM, + .src_addr = priv->base_dma_addr + SSI_RXDR, + .src_addr_width = buswidth, + .src_maxburst = SSI_FIFO_BURST_NUM, + }; + + dmaengine_slave_config(master->dma_rx, &rxconf); + + rxdesc = dmaengine_prep_slave_sg( + master->dma_rx, + t->rx_sg.sgl, t->rx_sg.nents, + DMA_DEV_TO_MEM, DMA_PREP_INTERRUPT | DMA_CTRL_ACK); + if (!rxdesc) + goto out_err_prep; + + rxdesc->callback = uniphier_spi_dma_rxcb; + rxdesc->callback_param = master; + + uniphier_spi_irq_enable(priv, SSI_IE_RXRE); + atomic_or(SSI_DMA_RX_BUSY, &priv->dma_busy); + + dmaengine_submit(rxdesc); + dma_async_issue_pending(master->dma_rx); + } + + if (priv->tx_buf) { + struct dma_slave_config txconf = { + .direction = DMA_MEM_TO_DEV, + .dst_addr = priv->base_dma_addr + SSI_TXDR, + .dst_addr_width = buswidth, + .dst_maxburst = SSI_FIFO_BURST_NUM, + }; + + dmaengine_slave_config(master->dma_tx, &txconf); + + txdesc = dmaengine_prep_slave_sg( + master->dma_tx, + t->tx_sg.sgl, t->tx_sg.nents, + DMA_MEM_TO_DEV, DMA_PREP_INTERRUPT | DMA_CTRL_ACK); + if (!txdesc) + goto out_err_prep; + + txdesc->callback = uniphier_spi_dma_txcb; + txdesc->callback_param = master; + + uniphier_spi_irq_enable(priv, SSI_IE_TXRE); + atomic_or(SSI_DMA_TX_BUSY, &priv->dma_busy); + + dmaengine_submit(txdesc); + dma_async_issue_pending(master->dma_tx); + } + + /* signal that we need to wait for completion */ + return (priv->tx_buf || priv->rx_buf); + +out_err_prep: + if (rxdesc) + dmaengine_terminate_sync(master->dma_rx); + + return -EINVAL; +} + +static int uniphier_spi_transfer_one_irq(struct spi_master *master, + struct spi_device *spi, + struct spi_transfer *t) +{ + struct uniphier_spi_priv *priv = spi_master_get_devdata(master); + struct device *dev = master->dev.parent; + unsigned long time_left; + + reinit_completion(&priv->xfer_done); + + uniphier_spi_fill_tx_fifo(priv); + + uniphier_spi_irq_enable(priv, SSI_IE_RCIE | SSI_IE_RORIE); + + time_left = wait_for_completion_timeout(&priv->xfer_done, + msecs_to_jiffies(SSI_TIMEOUT_MS)); + + uniphier_spi_irq_disable(priv, SSI_IE_RCIE | SSI_IE_RORIE); + + if (!time_left) { + dev_err(dev, "transfer timeout.\n"); + return -ETIMEDOUT; + } + + return priv->error; +} + +static int uniphier_spi_transfer_one_poll(struct spi_master *master, + struct spi_device *spi, + struct spi_transfer *t) +{ + struct uniphier_spi_priv *priv = spi_master_get_devdata(master); + int loop = SSI_POLL_TIMEOUT_US * 10; + + while (priv->tx_bytes) { + uniphier_spi_fill_tx_fifo(priv); + + while ((priv->rx_bytes - priv->tx_bytes) > 0) { + while (!(readl(priv->base + SSI_SR) & SSI_SR_RNE) + && loop--) + ndelay(100); + + if (loop == -1) + goto irq_transfer; + + uniphier_spi_recv(priv); + } + } + + return 0; + +irq_transfer: + return uniphier_spi_transfer_one_irq(master, spi, t); +} + +static int uniphier_spi_transfer_one(struct spi_master *master, + struct spi_device *spi, + struct spi_transfer *t) +{ + struct uniphier_spi_priv *priv = spi_master_get_devdata(master); + unsigned long threshold; + bool use_dma; + + /* Terminate and return success for 0 byte length transfer */ + if (!t->len) + return 0; + + uniphier_spi_setup_transfer(spi, t); + + use_dma = master->can_dma ? master->can_dma(master, spi, t) : false; + if (use_dma) + return uniphier_spi_transfer_one_dma(master, spi, t); + + /* + * If the transfer operation will take longer than + * SSI_POLL_TIMEOUT_US, it should use irq. + */ + threshold = DIV_ROUND_UP(SSI_POLL_TIMEOUT_US * priv->speed_hz, + USEC_PER_SEC * BITS_PER_BYTE); + if (t->len > threshold) + return uniphier_spi_transfer_one_irq(master, spi, t); + else + return uniphier_spi_transfer_one_poll(master, spi, t); +} + +static int uniphier_spi_prepare_transfer_hardware(struct spi_master *master) +{ + struct uniphier_spi_priv *priv = spi_master_get_devdata(master); + + writel(SSI_CTL_EN, priv->base + SSI_CTL); + + return 0; +} + +static int uniphier_spi_unprepare_transfer_hardware(struct spi_master *master) +{ + struct uniphier_spi_priv *priv = spi_master_get_devdata(master); + + writel(0, priv->base + SSI_CTL); + + return 0; +} + +static void uniphier_spi_handle_err(struct spi_master *master, + struct spi_message *msg) +{ + struct uniphier_spi_priv *priv = spi_master_get_devdata(master); + u32 val; + + /* stop running spi transfer */ + writel(0, priv->base + SSI_CTL); + + /* reset FIFOs */ + val = SSI_FC_TXFFL | SSI_FC_RXFFL; + writel(val, priv->base + SSI_FC); + + uniphier_spi_irq_disable(priv, SSI_IE_ALL_MASK); + + if (atomic_read(&priv->dma_busy) & SSI_DMA_TX_BUSY) { + dmaengine_terminate_async(master->dma_tx); + atomic_andnot(SSI_DMA_TX_BUSY, &priv->dma_busy); + } + + if (atomic_read(&priv->dma_busy) & SSI_DMA_RX_BUSY) { + dmaengine_terminate_async(master->dma_rx); + atomic_andnot(SSI_DMA_RX_BUSY, &priv->dma_busy); + } +} + +static irqreturn_t uniphier_spi_handler(int irq, void *dev_id) +{ + struct uniphier_spi_priv *priv = dev_id; + u32 val, stat; + + stat = readl(priv->base + SSI_IS); + val = SSI_IC_TCIC | SSI_IC_RCIC | SSI_IC_RORIC; + writel(val, priv->base + SSI_IC); + + /* rx fifo overrun */ + if (stat & SSI_IS_RORID) { + priv->error = -EIO; + goto done; + } + + /* rx complete */ + if ((stat & SSI_IS_RCID) && (stat & SSI_IS_RXRS)) { + while ((readl(priv->base + SSI_SR) & SSI_SR_RNE) && + (priv->rx_bytes - priv->tx_bytes) > 0) + uniphier_spi_recv(priv); + + if ((readl(priv->base + SSI_SR) & SSI_SR_RNE) || + (priv->rx_bytes != priv->tx_bytes)) { + priv->error = -EIO; + goto done; + } else if (priv->rx_bytes == 0) + goto done; + + /* next tx transfer */ + uniphier_spi_fill_tx_fifo(priv); + + return IRQ_HANDLED; + } + + return IRQ_NONE; + +done: + complete(&priv->xfer_done); + return IRQ_HANDLED; +} + +static int uniphier_spi_probe(struct platform_device *pdev) +{ + struct uniphier_spi_priv *priv; + struct spi_master *master; + struct resource *res; + struct dma_slave_caps caps; + u32 dma_tx_burst = 0, dma_rx_burst = 0; + unsigned long clk_rate; + int irq; + int ret; + + master = spi_alloc_master(&pdev->dev, sizeof(*priv)); + if (!master) + return -ENOMEM; + + platform_set_drvdata(pdev, master); + + priv = spi_master_get_devdata(master); + priv->master = master; + priv->is_save_param = false; + + priv->base = devm_platform_get_and_ioremap_resource(pdev, 0, &res); + if (IS_ERR(priv->base)) { + ret = PTR_ERR(priv->base); + goto out_master_put; + } + priv->base_dma_addr = res->start; + + priv->clk = devm_clk_get(&pdev->dev, NULL); + if (IS_ERR(priv->clk)) { + dev_err(&pdev->dev, "failed to get clock\n"); + ret = PTR_ERR(priv->clk); + goto out_master_put; + } + + ret = clk_prepare_enable(priv->clk); + if (ret) + goto out_master_put; + + irq = platform_get_irq(pdev, 0); + if (irq < 0) { + ret = irq; + goto out_disable_clk; + } + + ret = devm_request_irq(&pdev->dev, irq, uniphier_spi_handler, + 0, "uniphier-spi", priv); + if (ret) { + dev_err(&pdev->dev, "failed to request IRQ\n"); + goto out_disable_clk; + } + + init_completion(&priv->xfer_done); + + clk_rate = clk_get_rate(priv->clk); + + master->max_speed_hz = DIV_ROUND_UP(clk_rate, SSI_MIN_CLK_DIVIDER); + master->min_speed_hz = DIV_ROUND_UP(clk_rate, SSI_MAX_CLK_DIVIDER); + master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH | SPI_LSB_FIRST; + master->dev.of_node = pdev->dev.of_node; + master->bus_num = pdev->id; + master->bits_per_word_mask = SPI_BPW_RANGE_MASK(1, 32); + + master->set_cs = uniphier_spi_set_cs; + master->transfer_one = uniphier_spi_transfer_one; + master->prepare_transfer_hardware + = uniphier_spi_prepare_transfer_hardware; + master->unprepare_transfer_hardware + = uniphier_spi_unprepare_transfer_hardware; + master->handle_err = uniphier_spi_handle_err; + master->can_dma = uniphier_spi_can_dma; + + master->num_chipselect = 1; + master->flags = SPI_CONTROLLER_MUST_RX | SPI_CONTROLLER_MUST_TX; + + master->dma_tx = dma_request_chan(&pdev->dev, "tx"); + if (IS_ERR_OR_NULL(master->dma_tx)) { + if (PTR_ERR(master->dma_tx) == -EPROBE_DEFER) { + ret = -EPROBE_DEFER; + goto out_disable_clk; + } + master->dma_tx = NULL; + dma_tx_burst = INT_MAX; + } else { + ret = dma_get_slave_caps(master->dma_tx, &caps); + if (ret) { + dev_err(&pdev->dev, "failed to get TX DMA capacities: %d\n", + ret); + goto out_release_dma; + } + dma_tx_burst = caps.max_burst; + } + + master->dma_rx = dma_request_chan(&pdev->dev, "rx"); + if (IS_ERR_OR_NULL(master->dma_rx)) { + if (PTR_ERR(master->dma_rx) == -EPROBE_DEFER) { + ret = -EPROBE_DEFER; + goto out_release_dma; + } + master->dma_rx = NULL; + dma_rx_burst = INT_MAX; + } else { + ret = dma_get_slave_caps(master->dma_rx, &caps); + if (ret) { + dev_err(&pdev->dev, "failed to get RX DMA capacities: %d\n", + ret); + goto out_release_dma; + } + dma_rx_burst = caps.max_burst; + } + + master->max_dma_len = min(dma_tx_burst, dma_rx_burst); + + ret = devm_spi_register_master(&pdev->dev, master); + if (ret) + goto out_release_dma; + + return 0; + +out_release_dma: + if (!IS_ERR_OR_NULL(master->dma_rx)) { + dma_release_channel(master->dma_rx); + master->dma_rx = NULL; + } + if (!IS_ERR_OR_NULL(master->dma_tx)) { + dma_release_channel(master->dma_tx); + master->dma_tx = NULL; + } + +out_disable_clk: + clk_disable_unprepare(priv->clk); + +out_master_put: + spi_master_put(master); + return ret; +} + +static int uniphier_spi_remove(struct platform_device *pdev) +{ + struct spi_master *master = platform_get_drvdata(pdev); + struct uniphier_spi_priv *priv = spi_master_get_devdata(master); + + if (master->dma_tx) + dma_release_channel(master->dma_tx); + if (master->dma_rx) + dma_release_channel(master->dma_rx); + + clk_disable_unprepare(priv->clk); + + return 0; +} + +static const struct of_device_id uniphier_spi_match[] = { + { .compatible = "socionext,uniphier-scssi" }, + { /* sentinel */ } +}; +MODULE_DEVICE_TABLE(of, uniphier_spi_match); + +static struct platform_driver uniphier_spi_driver = { + .probe = uniphier_spi_probe, + .remove = uniphier_spi_remove, + .driver = { + .name = "uniphier-spi", + .of_match_table = uniphier_spi_match, + }, +}; +module_platform_driver(uniphier_spi_driver); + +MODULE_AUTHOR("Kunihiko Hayashi <hayashi.kunihiko@socionext.com>"); +MODULE_AUTHOR("Keiji Hayashibara <hayashibara.keiji@socionext.com>"); +MODULE_DESCRIPTION("Socionext UniPhier SPI controller driver"); +MODULE_LICENSE("GPL v2"); diff --git a/drivers/spi/spi-xcomm.c b/drivers/spi/spi-xcomm.c new file mode 100644 index 000000000..1d9b3f03d --- /dev/null +++ b/drivers/spi/spi-xcomm.c @@ -0,0 +1,251 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Analog Devices AD-FMCOMMS1-EBZ board I2C-SPI bridge driver + * + * Copyright 2012 Analog Devices Inc. + * Author: Lars-Peter Clausen <lars@metafoo.de> + */ + +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/delay.h> +#include <linux/i2c.h> +#include <linux/spi/spi.h> +#include <asm/unaligned.h> + +#define SPI_XCOMM_SETTINGS_LEN_OFFSET 10 +#define SPI_XCOMM_SETTINGS_3WIRE BIT(6) +#define SPI_XCOMM_SETTINGS_CS_HIGH BIT(5) +#define SPI_XCOMM_SETTINGS_SAMPLE_END BIT(4) +#define SPI_XCOMM_SETTINGS_CPHA BIT(3) +#define SPI_XCOMM_SETTINGS_CPOL BIT(2) +#define SPI_XCOMM_SETTINGS_CLOCK_DIV_MASK 0x3 +#define SPI_XCOMM_SETTINGS_CLOCK_DIV_64 0x2 +#define SPI_XCOMM_SETTINGS_CLOCK_DIV_16 0x1 +#define SPI_XCOMM_SETTINGS_CLOCK_DIV_4 0x0 + +#define SPI_XCOMM_CMD_UPDATE_CONFIG 0x03 +#define SPI_XCOMM_CMD_WRITE 0x04 + +#define SPI_XCOMM_CLOCK 48000000 + +struct spi_xcomm { + struct i2c_client *i2c; + + uint16_t settings; + uint16_t chipselect; + + unsigned int current_speed; + + uint8_t buf[63]; +}; + +static int spi_xcomm_sync_config(struct spi_xcomm *spi_xcomm, unsigned int len) +{ + uint16_t settings; + uint8_t *buf = spi_xcomm->buf; + + settings = spi_xcomm->settings; + settings |= len << SPI_XCOMM_SETTINGS_LEN_OFFSET; + + buf[0] = SPI_XCOMM_CMD_UPDATE_CONFIG; + put_unaligned_be16(settings, &buf[1]); + put_unaligned_be16(spi_xcomm->chipselect, &buf[3]); + + return i2c_master_send(spi_xcomm->i2c, buf, 5); +} + +static void spi_xcomm_chipselect(struct spi_xcomm *spi_xcomm, + struct spi_device *spi, int is_active) +{ + unsigned long cs = spi->chip_select; + uint16_t chipselect = spi_xcomm->chipselect; + + if (is_active) + chipselect |= BIT(cs); + else + chipselect &= ~BIT(cs); + + spi_xcomm->chipselect = chipselect; +} + +static int spi_xcomm_setup_transfer(struct spi_xcomm *spi_xcomm, + struct spi_device *spi, struct spi_transfer *t, unsigned int *settings) +{ + if (t->len > 62) + return -EINVAL; + + if (t->speed_hz != spi_xcomm->current_speed) { + unsigned int divider; + + divider = DIV_ROUND_UP(SPI_XCOMM_CLOCK, t->speed_hz); + if (divider >= 64) + *settings |= SPI_XCOMM_SETTINGS_CLOCK_DIV_64; + else if (divider >= 16) + *settings |= SPI_XCOMM_SETTINGS_CLOCK_DIV_16; + else + *settings |= SPI_XCOMM_SETTINGS_CLOCK_DIV_4; + + spi_xcomm->current_speed = t->speed_hz; + } + + if (spi->mode & SPI_CPOL) + *settings |= SPI_XCOMM_SETTINGS_CPOL; + else + *settings &= ~SPI_XCOMM_SETTINGS_CPOL; + + if (spi->mode & SPI_CPHA) + *settings &= ~SPI_XCOMM_SETTINGS_CPHA; + else + *settings |= SPI_XCOMM_SETTINGS_CPHA; + + if (spi->mode & SPI_3WIRE) + *settings |= SPI_XCOMM_SETTINGS_3WIRE; + else + *settings &= ~SPI_XCOMM_SETTINGS_3WIRE; + + return 0; +} + +static int spi_xcomm_txrx_bufs(struct spi_xcomm *spi_xcomm, + struct spi_device *spi, struct spi_transfer *t) +{ + int ret; + + if (t->tx_buf) { + spi_xcomm->buf[0] = SPI_XCOMM_CMD_WRITE; + memcpy(spi_xcomm->buf + 1, t->tx_buf, t->len); + + ret = i2c_master_send(spi_xcomm->i2c, spi_xcomm->buf, t->len + 1); + if (ret < 0) + return ret; + else if (ret != t->len + 1) + return -EIO; + } else if (t->rx_buf) { + ret = i2c_master_recv(spi_xcomm->i2c, t->rx_buf, t->len); + if (ret < 0) + return ret; + else if (ret != t->len) + return -EIO; + } + + return t->len; +} + +static int spi_xcomm_transfer_one(struct spi_master *master, + struct spi_message *msg) +{ + struct spi_xcomm *spi_xcomm = spi_master_get_devdata(master); + unsigned int settings = spi_xcomm->settings; + struct spi_device *spi = msg->spi; + unsigned cs_change = 0; + struct spi_transfer *t; + bool is_first = true; + int status = 0; + bool is_last; + + spi_xcomm_chipselect(spi_xcomm, spi, true); + + list_for_each_entry(t, &msg->transfers, transfer_list) { + + if (!t->tx_buf && !t->rx_buf && t->len) { + status = -EINVAL; + break; + } + + status = spi_xcomm_setup_transfer(spi_xcomm, spi, t, &settings); + if (status < 0) + break; + + is_last = list_is_last(&t->transfer_list, &msg->transfers); + cs_change = t->cs_change; + + if (cs_change ^ is_last) + settings |= BIT(5); + else + settings &= ~BIT(5); + + if (t->rx_buf) { + spi_xcomm->settings = settings; + status = spi_xcomm_sync_config(spi_xcomm, t->len); + if (status < 0) + break; + } else if (settings != spi_xcomm->settings || is_first) { + spi_xcomm->settings = settings; + status = spi_xcomm_sync_config(spi_xcomm, 0); + if (status < 0) + break; + } + + if (t->len) { + status = spi_xcomm_txrx_bufs(spi_xcomm, spi, t); + + if (status < 0) + break; + + if (status > 0) + msg->actual_length += status; + } + status = 0; + + spi_transfer_delay_exec(t); + + is_first = false; + } + + if (status != 0 || !cs_change) + spi_xcomm_chipselect(spi_xcomm, spi, false); + + msg->status = status; + spi_finalize_current_message(master); + + return status; +} + +static int spi_xcomm_probe(struct i2c_client *i2c, + const struct i2c_device_id *id) +{ + struct spi_xcomm *spi_xcomm; + struct spi_master *master; + int ret; + + master = spi_alloc_master(&i2c->dev, sizeof(*spi_xcomm)); + if (!master) + return -ENOMEM; + + spi_xcomm = spi_master_get_devdata(master); + spi_xcomm->i2c = i2c; + + master->num_chipselect = 16; + master->mode_bits = SPI_CPHA | SPI_CPOL | SPI_3WIRE; + master->bits_per_word_mask = SPI_BPW_MASK(8); + master->flags = SPI_MASTER_HALF_DUPLEX; + master->transfer_one_message = spi_xcomm_transfer_one; + master->dev.of_node = i2c->dev.of_node; + i2c_set_clientdata(i2c, master); + + ret = devm_spi_register_master(&i2c->dev, master); + if (ret < 0) + spi_master_put(master); + + return ret; +} + +static const struct i2c_device_id spi_xcomm_ids[] = { + { "spi-xcomm" }, + { }, +}; +MODULE_DEVICE_TABLE(i2c, spi_xcomm_ids); + +static struct i2c_driver spi_xcomm_driver = { + .driver = { + .name = "spi-xcomm", + }, + .id_table = spi_xcomm_ids, + .probe = spi_xcomm_probe, +}; +module_i2c_driver(spi_xcomm_driver); + +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>"); +MODULE_DESCRIPTION("Analog Devices AD-FMCOMMS1-EBZ board I2C-SPI bridge driver"); diff --git a/drivers/spi/spi-xilinx.c b/drivers/spi/spi-xilinx.c new file mode 100644 index 000000000..523edfdf5 --- /dev/null +++ b/drivers/spi/spi-xilinx.c @@ -0,0 +1,543 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Xilinx SPI controller driver (master mode only) + * + * Author: MontaVista Software, Inc. + * source@mvista.com + * + * Copyright (c) 2010 Secret Lab Technologies, Ltd. + * Copyright (c) 2009 Intel Corporation + * 2002-2007 (c) MontaVista Software, Inc. + + */ + +#include <linux/module.h> +#include <linux/interrupt.h> +#include <linux/of.h> +#include <linux/platform_device.h> +#include <linux/spi/spi.h> +#include <linux/spi/spi_bitbang.h> +#include <linux/spi/xilinx_spi.h> +#include <linux/io.h> + +#define XILINX_SPI_MAX_CS 32 + +#define XILINX_SPI_NAME "xilinx_spi" + +/* Register definitions as per "OPB Serial Peripheral Interface (SPI) (v1.00e) + * Product Specification", DS464 + */ +#define XSPI_CR_OFFSET 0x60 /* Control Register */ + +#define XSPI_CR_LOOP 0x01 +#define XSPI_CR_ENABLE 0x02 +#define XSPI_CR_MASTER_MODE 0x04 +#define XSPI_CR_CPOL 0x08 +#define XSPI_CR_CPHA 0x10 +#define XSPI_CR_MODE_MASK (XSPI_CR_CPHA | XSPI_CR_CPOL | \ + XSPI_CR_LSB_FIRST | XSPI_CR_LOOP) +#define XSPI_CR_TXFIFO_RESET 0x20 +#define XSPI_CR_RXFIFO_RESET 0x40 +#define XSPI_CR_MANUAL_SSELECT 0x80 +#define XSPI_CR_TRANS_INHIBIT 0x100 +#define XSPI_CR_LSB_FIRST 0x200 + +#define XSPI_SR_OFFSET 0x64 /* Status Register */ + +#define XSPI_SR_RX_EMPTY_MASK 0x01 /* Receive FIFO is empty */ +#define XSPI_SR_RX_FULL_MASK 0x02 /* Receive FIFO is full */ +#define XSPI_SR_TX_EMPTY_MASK 0x04 /* Transmit FIFO is empty */ +#define XSPI_SR_TX_FULL_MASK 0x08 /* Transmit FIFO is full */ +#define XSPI_SR_MODE_FAULT_MASK 0x10 /* Mode fault error */ + +#define XSPI_TXD_OFFSET 0x68 /* Data Transmit Register */ +#define XSPI_RXD_OFFSET 0x6c /* Data Receive Register */ + +#define XSPI_SSR_OFFSET 0x70 /* 32-bit Slave Select Register */ + +/* Register definitions as per "OPB IPIF (v3.01c) Product Specification", DS414 + * IPIF registers are 32 bit + */ +#define XIPIF_V123B_DGIER_OFFSET 0x1c /* IPIF global int enable reg */ +#define XIPIF_V123B_GINTR_ENABLE 0x80000000 + +#define XIPIF_V123B_IISR_OFFSET 0x20 /* IPIF interrupt status reg */ +#define XIPIF_V123B_IIER_OFFSET 0x28 /* IPIF interrupt enable reg */ + +#define XSPI_INTR_MODE_FAULT 0x01 /* Mode fault error */ +#define XSPI_INTR_SLAVE_MODE_FAULT 0x02 /* Selected as slave while + * disabled */ +#define XSPI_INTR_TX_EMPTY 0x04 /* TxFIFO is empty */ +#define XSPI_INTR_TX_UNDERRUN 0x08 /* TxFIFO was underrun */ +#define XSPI_INTR_RX_FULL 0x10 /* RxFIFO is full */ +#define XSPI_INTR_RX_OVERRUN 0x20 /* RxFIFO was overrun */ +#define XSPI_INTR_TX_HALF_EMPTY 0x40 /* TxFIFO is half empty */ + +#define XIPIF_V123B_RESETR_OFFSET 0x40 /* IPIF reset register */ +#define XIPIF_V123B_RESET_MASK 0x0a /* the value to write */ + +struct xilinx_spi { + /* bitbang has to be first */ + struct spi_bitbang bitbang; + struct completion done; + void __iomem *regs; /* virt. address of the control registers */ + + int irq; + + u8 *rx_ptr; /* pointer in the Tx buffer */ + const u8 *tx_ptr; /* pointer in the Rx buffer */ + u8 bytes_per_word; + int buffer_size; /* buffer size in words */ + u32 cs_inactive; /* Level of the CS pins when inactive*/ + unsigned int (*read_fn)(void __iomem *); + void (*write_fn)(u32, void __iomem *); +}; + +static void xspi_write32(u32 val, void __iomem *addr) +{ + iowrite32(val, addr); +} + +static unsigned int xspi_read32(void __iomem *addr) +{ + return ioread32(addr); +} + +static void xspi_write32_be(u32 val, void __iomem *addr) +{ + iowrite32be(val, addr); +} + +static unsigned int xspi_read32_be(void __iomem *addr) +{ + return ioread32be(addr); +} + +static void xilinx_spi_tx(struct xilinx_spi *xspi) +{ + u32 data = 0; + + if (!xspi->tx_ptr) { + xspi->write_fn(0, xspi->regs + XSPI_TXD_OFFSET); + return; + } + + switch (xspi->bytes_per_word) { + case 1: + data = *(u8 *)(xspi->tx_ptr); + break; + case 2: + data = *(u16 *)(xspi->tx_ptr); + break; + case 4: + data = *(u32 *)(xspi->tx_ptr); + break; + } + + xspi->write_fn(data, xspi->regs + XSPI_TXD_OFFSET); + xspi->tx_ptr += xspi->bytes_per_word; +} + +static void xilinx_spi_rx(struct xilinx_spi *xspi) +{ + u32 data = xspi->read_fn(xspi->regs + XSPI_RXD_OFFSET); + + if (!xspi->rx_ptr) + return; + + switch (xspi->bytes_per_word) { + case 1: + *(u8 *)(xspi->rx_ptr) = data; + break; + case 2: + *(u16 *)(xspi->rx_ptr) = data; + break; + case 4: + *(u32 *)(xspi->rx_ptr) = data; + break; + } + + xspi->rx_ptr += xspi->bytes_per_word; +} + +static void xspi_init_hw(struct xilinx_spi *xspi) +{ + void __iomem *regs_base = xspi->regs; + + /* Reset the SPI device */ + xspi->write_fn(XIPIF_V123B_RESET_MASK, + regs_base + XIPIF_V123B_RESETR_OFFSET); + /* Enable the transmit empty interrupt, which we use to determine + * progress on the transmission. + */ + xspi->write_fn(XSPI_INTR_TX_EMPTY, + regs_base + XIPIF_V123B_IIER_OFFSET); + /* Disable the global IPIF interrupt */ + xspi->write_fn(0, regs_base + XIPIF_V123B_DGIER_OFFSET); + /* Deselect the slave on the SPI bus */ + xspi->write_fn(0xffff, regs_base + XSPI_SSR_OFFSET); + /* Disable the transmitter, enable Manual Slave Select Assertion, + * put SPI controller into master mode, and enable it */ + xspi->write_fn(XSPI_CR_MANUAL_SSELECT | XSPI_CR_MASTER_MODE | + XSPI_CR_ENABLE | XSPI_CR_TXFIFO_RESET | XSPI_CR_RXFIFO_RESET, + regs_base + XSPI_CR_OFFSET); +} + +static void xilinx_spi_chipselect(struct spi_device *spi, int is_on) +{ + struct xilinx_spi *xspi = spi_master_get_devdata(spi->master); + u16 cr; + u32 cs; + + if (is_on == BITBANG_CS_INACTIVE) { + /* Deselect the slave on the SPI bus */ + xspi->write_fn(xspi->cs_inactive, xspi->regs + XSPI_SSR_OFFSET); + return; + } + + /* Set the SPI clock phase and polarity */ + cr = xspi->read_fn(xspi->regs + XSPI_CR_OFFSET) & ~XSPI_CR_MODE_MASK; + if (spi->mode & SPI_CPHA) + cr |= XSPI_CR_CPHA; + if (spi->mode & SPI_CPOL) + cr |= XSPI_CR_CPOL; + if (spi->mode & SPI_LSB_FIRST) + cr |= XSPI_CR_LSB_FIRST; + if (spi->mode & SPI_LOOP) + cr |= XSPI_CR_LOOP; + xspi->write_fn(cr, xspi->regs + XSPI_CR_OFFSET); + + /* We do not check spi->max_speed_hz here as the SPI clock + * frequency is not software programmable (the IP block design + * parameter) + */ + + cs = xspi->cs_inactive; + cs ^= BIT(spi->chip_select); + + /* Activate the chip select */ + xspi->write_fn(cs, xspi->regs + XSPI_SSR_OFFSET); +} + +/* spi_bitbang requires custom setup_transfer() to be defined if there is a + * custom txrx_bufs(). + */ +static int xilinx_spi_setup_transfer(struct spi_device *spi, + struct spi_transfer *t) +{ + struct xilinx_spi *xspi = spi_master_get_devdata(spi->master); + + if (spi->mode & SPI_CS_HIGH) + xspi->cs_inactive &= ~BIT(spi->chip_select); + else + xspi->cs_inactive |= BIT(spi->chip_select); + + return 0; +} + +static int xilinx_spi_txrx_bufs(struct spi_device *spi, struct spi_transfer *t) +{ + struct xilinx_spi *xspi = spi_master_get_devdata(spi->master); + int remaining_words; /* the number of words left to transfer */ + bool use_irq = false; + u16 cr = 0; + + /* We get here with transmitter inhibited */ + + xspi->tx_ptr = t->tx_buf; + xspi->rx_ptr = t->rx_buf; + remaining_words = t->len / xspi->bytes_per_word; + + if (xspi->irq >= 0 && remaining_words > xspi->buffer_size) { + u32 isr; + use_irq = true; + /* Inhibit irq to avoid spurious irqs on tx_empty*/ + cr = xspi->read_fn(xspi->regs + XSPI_CR_OFFSET); + xspi->write_fn(cr | XSPI_CR_TRANS_INHIBIT, + xspi->regs + XSPI_CR_OFFSET); + /* ACK old irqs (if any) */ + isr = xspi->read_fn(xspi->regs + XIPIF_V123B_IISR_OFFSET); + if (isr) + xspi->write_fn(isr, + xspi->regs + XIPIF_V123B_IISR_OFFSET); + /* Enable the global IPIF interrupt */ + xspi->write_fn(XIPIF_V123B_GINTR_ENABLE, + xspi->regs + XIPIF_V123B_DGIER_OFFSET); + reinit_completion(&xspi->done); + } + + while (remaining_words) { + int n_words, tx_words, rx_words; + u32 sr; + int stalled; + + n_words = min(remaining_words, xspi->buffer_size); + + tx_words = n_words; + while (tx_words--) + xilinx_spi_tx(xspi); + + /* Start the transfer by not inhibiting the transmitter any + * longer + */ + + if (use_irq) { + xspi->write_fn(cr, xspi->regs + XSPI_CR_OFFSET); + wait_for_completion(&xspi->done); + /* A transmit has just completed. Process received data + * and check for more data to transmit. Always inhibit + * the transmitter while the Isr refills the transmit + * register/FIFO, or make sure it is stopped if we're + * done. + */ + xspi->write_fn(cr | XSPI_CR_TRANS_INHIBIT, + xspi->regs + XSPI_CR_OFFSET); + sr = XSPI_SR_TX_EMPTY_MASK; + } else + sr = xspi->read_fn(xspi->regs + XSPI_SR_OFFSET); + + /* Read out all the data from the Rx FIFO */ + rx_words = n_words; + stalled = 10; + while (rx_words) { + if (rx_words == n_words && !(stalled--) && + !(sr & XSPI_SR_TX_EMPTY_MASK) && + (sr & XSPI_SR_RX_EMPTY_MASK)) { + dev_err(&spi->dev, + "Detected stall. Check C_SPI_MODE and C_SPI_MEMORY\n"); + xspi_init_hw(xspi); + return -EIO; + } + + if ((sr & XSPI_SR_TX_EMPTY_MASK) && (rx_words > 1)) { + xilinx_spi_rx(xspi); + rx_words--; + continue; + } + + sr = xspi->read_fn(xspi->regs + XSPI_SR_OFFSET); + if (!(sr & XSPI_SR_RX_EMPTY_MASK)) { + xilinx_spi_rx(xspi); + rx_words--; + } + } + + remaining_words -= n_words; + } + + if (use_irq) { + xspi->write_fn(0, xspi->regs + XIPIF_V123B_DGIER_OFFSET); + xspi->write_fn(cr, xspi->regs + XSPI_CR_OFFSET); + } + + return t->len; +} + + +/* This driver supports single master mode only. Hence Tx FIFO Empty + * is the only interrupt we care about. + * Receive FIFO Overrun, Transmit FIFO Underrun, Mode Fault, and Slave Mode + * Fault are not to happen. + */ +static irqreturn_t xilinx_spi_irq(int irq, void *dev_id) +{ + struct xilinx_spi *xspi = dev_id; + u32 ipif_isr; + + /* Get the IPIF interrupts, and clear them immediately */ + ipif_isr = xspi->read_fn(xspi->regs + XIPIF_V123B_IISR_OFFSET); + xspi->write_fn(ipif_isr, xspi->regs + XIPIF_V123B_IISR_OFFSET); + + if (ipif_isr & XSPI_INTR_TX_EMPTY) { /* Transmission completed */ + complete(&xspi->done); + return IRQ_HANDLED; + } + + return IRQ_NONE; +} + +static int xilinx_spi_find_buffer_size(struct xilinx_spi *xspi) +{ + u8 sr; + int n_words = 0; + + /* + * Before the buffer_size detection we reset the core + * to make sure we start with a clean state. + */ + xspi->write_fn(XIPIF_V123B_RESET_MASK, + xspi->regs + XIPIF_V123B_RESETR_OFFSET); + + /* Fill the Tx FIFO with as many words as possible */ + do { + xspi->write_fn(0, xspi->regs + XSPI_TXD_OFFSET); + sr = xspi->read_fn(xspi->regs + XSPI_SR_OFFSET); + n_words++; + } while (!(sr & XSPI_SR_TX_FULL_MASK)); + + return n_words; +} + +static const struct of_device_id xilinx_spi_of_match[] = { + { .compatible = "xlnx,axi-quad-spi-1.00.a", }, + { .compatible = "xlnx,xps-spi-2.00.a", }, + { .compatible = "xlnx,xps-spi-2.00.b", }, + {} +}; +MODULE_DEVICE_TABLE(of, xilinx_spi_of_match); + +static int xilinx_spi_probe(struct platform_device *pdev) +{ + struct xilinx_spi *xspi; + struct xspi_platform_data *pdata; + struct resource *res; + int ret, num_cs = 0, bits_per_word; + struct spi_master *master; + u32 tmp; + u8 i; + + pdata = dev_get_platdata(&pdev->dev); + if (pdata) { + num_cs = pdata->num_chipselect; + bits_per_word = pdata->bits_per_word; + } else { + of_property_read_u32(pdev->dev.of_node, "xlnx,num-ss-bits", + &num_cs); + ret = of_property_read_u32(pdev->dev.of_node, + "xlnx,num-transfer-bits", + &bits_per_word); + if (ret) + bits_per_word = 8; + } + + if (!num_cs) { + dev_err(&pdev->dev, + "Missing slave select configuration data\n"); + return -EINVAL; + } + + if (num_cs > XILINX_SPI_MAX_CS) { + dev_err(&pdev->dev, "Invalid number of spi slaves\n"); + return -EINVAL; + } + + master = spi_alloc_master(&pdev->dev, sizeof(struct xilinx_spi)); + if (!master) + return -ENODEV; + + /* the spi->mode bits understood by this driver: */ + master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_LSB_FIRST | SPI_LOOP | + SPI_CS_HIGH; + + xspi = spi_master_get_devdata(master); + xspi->cs_inactive = 0xffffffff; + xspi->bitbang.master = master; + xspi->bitbang.chipselect = xilinx_spi_chipselect; + xspi->bitbang.setup_transfer = xilinx_spi_setup_transfer; + xspi->bitbang.txrx_bufs = xilinx_spi_txrx_bufs; + init_completion(&xspi->done); + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + xspi->regs = devm_ioremap_resource(&pdev->dev, res); + if (IS_ERR(xspi->regs)) { + ret = PTR_ERR(xspi->regs); + goto put_master; + } + + master->bus_num = pdev->id; + master->num_chipselect = num_cs; + master->dev.of_node = pdev->dev.of_node; + + /* + * Detect endianess on the IP via loop bit in CR. Detection + * must be done before reset is sent because incorrect reset + * value generates error interrupt. + * Setup little endian helper functions first and try to use them + * and check if bit was correctly setup or not. + */ + xspi->read_fn = xspi_read32; + xspi->write_fn = xspi_write32; + + xspi->write_fn(XSPI_CR_LOOP, xspi->regs + XSPI_CR_OFFSET); + tmp = xspi->read_fn(xspi->regs + XSPI_CR_OFFSET); + tmp &= XSPI_CR_LOOP; + if (tmp != XSPI_CR_LOOP) { + xspi->read_fn = xspi_read32_be; + xspi->write_fn = xspi_write32_be; + } + + master->bits_per_word_mask = SPI_BPW_MASK(bits_per_word); + xspi->bytes_per_word = bits_per_word / 8; + xspi->buffer_size = xilinx_spi_find_buffer_size(xspi); + + xspi->irq = platform_get_irq(pdev, 0); + if (xspi->irq < 0 && xspi->irq != -ENXIO) { + ret = xspi->irq; + goto put_master; + } else if (xspi->irq >= 0) { + /* Register for SPI Interrupt */ + ret = devm_request_irq(&pdev->dev, xspi->irq, xilinx_spi_irq, 0, + dev_name(&pdev->dev), xspi); + if (ret) + goto put_master; + } + + /* SPI controller initializations */ + xspi_init_hw(xspi); + + ret = spi_bitbang_start(&xspi->bitbang); + if (ret) { + dev_err(&pdev->dev, "spi_bitbang_start FAILED\n"); + goto put_master; + } + + dev_info(&pdev->dev, "at %pR, irq=%d\n", res, xspi->irq); + + if (pdata) { + for (i = 0; i < pdata->num_devices; i++) + spi_new_device(master, pdata->devices + i); + } + + platform_set_drvdata(pdev, master); + return 0; + +put_master: + spi_master_put(master); + + return ret; +} + +static int xilinx_spi_remove(struct platform_device *pdev) +{ + struct spi_master *master = platform_get_drvdata(pdev); + struct xilinx_spi *xspi = spi_master_get_devdata(master); + void __iomem *regs_base = xspi->regs; + + spi_bitbang_stop(&xspi->bitbang); + + /* Disable all the interrupts just in case */ + xspi->write_fn(0, regs_base + XIPIF_V123B_IIER_OFFSET); + /* Disable the global IPIF interrupt */ + xspi->write_fn(0, regs_base + XIPIF_V123B_DGIER_OFFSET); + + spi_master_put(xspi->bitbang.master); + + return 0; +} + +/* work with hotplug and coldplug */ +MODULE_ALIAS("platform:" XILINX_SPI_NAME); + +static struct platform_driver xilinx_spi_driver = { + .probe = xilinx_spi_probe, + .remove = xilinx_spi_remove, + .driver = { + .name = XILINX_SPI_NAME, + .of_match_table = xilinx_spi_of_match, + }, +}; +module_platform_driver(xilinx_spi_driver); + +MODULE_AUTHOR("MontaVista Software, Inc. <source@mvista.com>"); +MODULE_DESCRIPTION("Xilinx SPI driver"); +MODULE_LICENSE("GPL"); diff --git a/drivers/spi/spi-xlp.c b/drivers/spi/spi-xlp.c new file mode 100644 index 000000000..797ac0ea8 --- /dev/null +++ b/drivers/spi/spi-xlp.c @@ -0,0 +1,457 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright (C) 2003-2015 Broadcom Corporation + * All Rights Reserved + */ +#include <linux/acpi.h> +#include <linux/clk.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/platform_device.h> +#include <linux/spi/spi.h> +#include <linux/of.h> +#include <linux/interrupt.h> + +/* SPI Configuration Register */ +#define XLP_SPI_CONFIG 0x00 +#define XLP_SPI_CPHA BIT(0) +#define XLP_SPI_CPOL BIT(1) +#define XLP_SPI_CS_POL BIT(2) +#define XLP_SPI_TXMISO_EN BIT(3) +#define XLP_SPI_TXMOSI_EN BIT(4) +#define XLP_SPI_RXMISO_EN BIT(5) +#define XLP_SPI_CS_LSBFE BIT(10) +#define XLP_SPI_RXCAP_EN BIT(11) + +/* SPI Frequency Divider Register */ +#define XLP_SPI_FDIV 0x04 + +/* SPI Command Register */ +#define XLP_SPI_CMD 0x08 +#define XLP_SPI_CMD_IDLE_MASK 0x0 +#define XLP_SPI_CMD_TX_MASK 0x1 +#define XLP_SPI_CMD_RX_MASK 0x2 +#define XLP_SPI_CMD_TXRX_MASK 0x3 +#define XLP_SPI_CMD_CONT BIT(4) +#define XLP_SPI_XFR_BITCNT_SHIFT 16 + +/* SPI Status Register */ +#define XLP_SPI_STATUS 0x0c +#define XLP_SPI_XFR_PENDING BIT(0) +#define XLP_SPI_XFR_DONE BIT(1) +#define XLP_SPI_TX_INT BIT(2) +#define XLP_SPI_RX_INT BIT(3) +#define XLP_SPI_TX_UF BIT(4) +#define XLP_SPI_RX_OF BIT(5) +#define XLP_SPI_STAT_MASK 0x3f + +/* SPI Interrupt Enable Register */ +#define XLP_SPI_INTR_EN 0x10 +#define XLP_SPI_INTR_DONE BIT(0) +#define XLP_SPI_INTR_TXTH BIT(1) +#define XLP_SPI_INTR_RXTH BIT(2) +#define XLP_SPI_INTR_TXUF BIT(3) +#define XLP_SPI_INTR_RXOF BIT(4) + +/* SPI FIFO Threshold Register */ +#define XLP_SPI_FIFO_THRESH 0x14 + +/* SPI FIFO Word Count Register */ +#define XLP_SPI_FIFO_WCNT 0x18 +#define XLP_SPI_RXFIFO_WCNT_MASK 0xf +#define XLP_SPI_TXFIFO_WCNT_MASK 0xf0 +#define XLP_SPI_TXFIFO_WCNT_SHIFT 4 + +/* SPI Transmit Data FIFO Register */ +#define XLP_SPI_TXDATA_FIFO 0x1c + +/* SPI Receive Data FIFO Register */ +#define XLP_SPI_RXDATA_FIFO 0x20 + +/* SPI System Control Register */ +#define XLP_SPI_SYSCTRL 0x100 +#define XLP_SPI_SYS_RESET BIT(0) +#define XLP_SPI_SYS_CLKDIS BIT(1) +#define XLP_SPI_SYS_PMEN BIT(8) + +#define SPI_CS_OFFSET 0x40 +#define XLP_SPI_TXRXTH 0x80 +#define XLP_SPI_FIFO_SIZE 8 +#define XLP_SPI_MAX_CS 4 +#define XLP_SPI_DEFAULT_FREQ 133333333 +#define XLP_SPI_FDIV_MIN 4 +#define XLP_SPI_FDIV_MAX 65535 +/* + * SPI can transfer only 28 bytes properly at a time. So split the + * transfer into 28 bytes size. + */ +#define XLP_SPI_XFER_SIZE 28 + +struct xlp_spi_priv { + struct device dev; /* device structure */ + void __iomem *base; /* spi registers base address */ + const u8 *tx_buf; /* tx data buffer */ + u8 *rx_buf; /* rx data buffer */ + int tx_len; /* tx xfer length */ + int rx_len; /* rx xfer length */ + int txerrors; /* TXFIFO underflow count */ + int rxerrors; /* RXFIFO overflow count */ + int cs; /* slave device chip select */ + u32 spi_clk; /* spi clock frequency */ + bool cmd_cont; /* cs active */ + struct completion done; /* completion notification */ +}; + +static inline u32 xlp_spi_reg_read(struct xlp_spi_priv *priv, + int cs, int regoff) +{ + return readl(priv->base + regoff + cs * SPI_CS_OFFSET); +} + +static inline void xlp_spi_reg_write(struct xlp_spi_priv *priv, int cs, + int regoff, u32 val) +{ + writel(val, priv->base + regoff + cs * SPI_CS_OFFSET); +} + +static inline void xlp_spi_sysctl_write(struct xlp_spi_priv *priv, + int regoff, u32 val) +{ + writel(val, priv->base + regoff); +} + +/* + * Setup global SPI_SYSCTRL register for all SPI channels. + */ +static void xlp_spi_sysctl_setup(struct xlp_spi_priv *xspi) +{ + int cs; + + for (cs = 0; cs < XLP_SPI_MAX_CS; cs++) + xlp_spi_sysctl_write(xspi, XLP_SPI_SYSCTRL, + XLP_SPI_SYS_RESET << cs); + xlp_spi_sysctl_write(xspi, XLP_SPI_SYSCTRL, XLP_SPI_SYS_PMEN); +} + +static int xlp_spi_setup(struct spi_device *spi) +{ + struct xlp_spi_priv *xspi; + u32 fdiv, cfg; + int cs; + + xspi = spi_master_get_devdata(spi->master); + cs = spi->chip_select; + /* + * The value of fdiv must be between 4 and 65535. + */ + fdiv = DIV_ROUND_UP(xspi->spi_clk, spi->max_speed_hz); + if (fdiv > XLP_SPI_FDIV_MAX) + fdiv = XLP_SPI_FDIV_MAX; + else if (fdiv < XLP_SPI_FDIV_MIN) + fdiv = XLP_SPI_FDIV_MIN; + + xlp_spi_reg_write(xspi, cs, XLP_SPI_FDIV, fdiv); + xlp_spi_reg_write(xspi, cs, XLP_SPI_FIFO_THRESH, XLP_SPI_TXRXTH); + cfg = xlp_spi_reg_read(xspi, cs, XLP_SPI_CONFIG); + if (spi->mode & SPI_CPHA) + cfg |= XLP_SPI_CPHA; + else + cfg &= ~XLP_SPI_CPHA; + if (spi->mode & SPI_CPOL) + cfg |= XLP_SPI_CPOL; + else + cfg &= ~XLP_SPI_CPOL; + if (!(spi->mode & SPI_CS_HIGH)) + cfg |= XLP_SPI_CS_POL; + else + cfg &= ~XLP_SPI_CS_POL; + if (spi->mode & SPI_LSB_FIRST) + cfg |= XLP_SPI_CS_LSBFE; + else + cfg &= ~XLP_SPI_CS_LSBFE; + + cfg |= XLP_SPI_TXMOSI_EN | XLP_SPI_RXMISO_EN; + if (fdiv == 4) + cfg |= XLP_SPI_RXCAP_EN; + xlp_spi_reg_write(xspi, cs, XLP_SPI_CONFIG, cfg); + + return 0; +} + +static void xlp_spi_read_rxfifo(struct xlp_spi_priv *xspi) +{ + u32 rx_data, rxfifo_cnt; + int i, j, nbytes; + + rxfifo_cnt = xlp_spi_reg_read(xspi, xspi->cs, XLP_SPI_FIFO_WCNT); + rxfifo_cnt &= XLP_SPI_RXFIFO_WCNT_MASK; + while (rxfifo_cnt) { + rx_data = xlp_spi_reg_read(xspi, xspi->cs, XLP_SPI_RXDATA_FIFO); + j = 0; + nbytes = min(xspi->rx_len, 4); + for (i = nbytes - 1; i >= 0; i--, j++) + xspi->rx_buf[i] = (rx_data >> (j * 8)) & 0xff; + + xspi->rx_len -= nbytes; + xspi->rx_buf += nbytes; + rxfifo_cnt--; + } +} + +static void xlp_spi_fill_txfifo(struct xlp_spi_priv *xspi) +{ + u32 tx_data, txfifo_cnt; + int i, j, nbytes; + + txfifo_cnt = xlp_spi_reg_read(xspi, xspi->cs, XLP_SPI_FIFO_WCNT); + txfifo_cnt &= XLP_SPI_TXFIFO_WCNT_MASK; + txfifo_cnt >>= XLP_SPI_TXFIFO_WCNT_SHIFT; + while (xspi->tx_len && (txfifo_cnt < XLP_SPI_FIFO_SIZE)) { + j = 0; + tx_data = 0; + nbytes = min(xspi->tx_len, 4); + for (i = nbytes - 1; i >= 0; i--, j++) + tx_data |= xspi->tx_buf[i] << (j * 8); + + xlp_spi_reg_write(xspi, xspi->cs, XLP_SPI_TXDATA_FIFO, tx_data); + xspi->tx_len -= nbytes; + xspi->tx_buf += nbytes; + txfifo_cnt++; + } +} + +static irqreturn_t xlp_spi_interrupt(int irq, void *dev_id) +{ + struct xlp_spi_priv *xspi = dev_id; + u32 stat; + + stat = xlp_spi_reg_read(xspi, xspi->cs, XLP_SPI_STATUS) & + XLP_SPI_STAT_MASK; + if (!stat) + return IRQ_NONE; + + if (stat & XLP_SPI_TX_INT) { + if (xspi->tx_len) + xlp_spi_fill_txfifo(xspi); + if (stat & XLP_SPI_TX_UF) + xspi->txerrors++; + } + + if (stat & XLP_SPI_RX_INT) { + if (xspi->rx_len) + xlp_spi_read_rxfifo(xspi); + if (stat & XLP_SPI_RX_OF) + xspi->rxerrors++; + } + + /* write status back to clear interrupts */ + xlp_spi_reg_write(xspi, xspi->cs, XLP_SPI_STATUS, stat); + if (stat & XLP_SPI_XFR_DONE) + complete(&xspi->done); + + return IRQ_HANDLED; +} + +static void xlp_spi_send_cmd(struct xlp_spi_priv *xspi, int xfer_len, + int cmd_cont) +{ + u32 cmd = 0; + + if (xspi->tx_buf) + cmd |= XLP_SPI_CMD_TX_MASK; + if (xspi->rx_buf) + cmd |= XLP_SPI_CMD_RX_MASK; + if (cmd_cont) + cmd |= XLP_SPI_CMD_CONT; + cmd |= ((xfer_len * 8 - 1) << XLP_SPI_XFR_BITCNT_SHIFT); + xlp_spi_reg_write(xspi, xspi->cs, XLP_SPI_CMD, cmd); +} + +static int xlp_spi_xfer_block(struct xlp_spi_priv *xs, + const unsigned char *tx_buf, + unsigned char *rx_buf, int xfer_len, int cmd_cont) +{ + int timeout; + u32 intr_mask = 0; + + xs->tx_buf = tx_buf; + xs->rx_buf = rx_buf; + xs->tx_len = (xs->tx_buf == NULL) ? 0 : xfer_len; + xs->rx_len = (xs->rx_buf == NULL) ? 0 : xfer_len; + xs->txerrors = xs->rxerrors = 0; + + /* fill TXDATA_FIFO, then send the CMD */ + if (xs->tx_len) + xlp_spi_fill_txfifo(xs); + + xlp_spi_send_cmd(xs, xfer_len, cmd_cont); + + /* + * We are getting some spurious tx interrupts, so avoid enabling + * tx interrupts when only rx is in process. + * Enable all the interrupts in tx case. + */ + if (xs->tx_len) + intr_mask |= XLP_SPI_INTR_TXTH | XLP_SPI_INTR_TXUF | + XLP_SPI_INTR_RXTH | XLP_SPI_INTR_RXOF; + else + intr_mask |= XLP_SPI_INTR_RXTH | XLP_SPI_INTR_RXOF; + + intr_mask |= XLP_SPI_INTR_DONE; + xlp_spi_reg_write(xs, xs->cs, XLP_SPI_INTR_EN, intr_mask); + + timeout = wait_for_completion_timeout(&xs->done, + msecs_to_jiffies(1000)); + /* Disable interrupts */ + xlp_spi_reg_write(xs, xs->cs, XLP_SPI_INTR_EN, 0x0); + if (!timeout) { + dev_err(&xs->dev, "xfer timedout!\n"); + goto out; + } + if (xs->txerrors || xs->rxerrors) + dev_err(&xs->dev, "Over/Underflow rx %d tx %d xfer %d!\n", + xs->rxerrors, xs->txerrors, xfer_len); + + return xfer_len; +out: + return -ETIMEDOUT; +} + +static int xlp_spi_txrx_bufs(struct xlp_spi_priv *xs, struct spi_transfer *t) +{ + int bytesleft, sz; + unsigned char *rx_buf; + const unsigned char *tx_buf; + + tx_buf = t->tx_buf; + rx_buf = t->rx_buf; + bytesleft = t->len; + while (bytesleft) { + if (bytesleft > XLP_SPI_XFER_SIZE) + sz = xlp_spi_xfer_block(xs, tx_buf, rx_buf, + XLP_SPI_XFER_SIZE, 1); + else + sz = xlp_spi_xfer_block(xs, tx_buf, rx_buf, + bytesleft, xs->cmd_cont); + if (sz < 0) + return sz; + bytesleft -= sz; + if (tx_buf) + tx_buf += sz; + if (rx_buf) + rx_buf += sz; + } + return bytesleft; +} + +static int xlp_spi_transfer_one(struct spi_master *master, + struct spi_device *spi, + struct spi_transfer *t) +{ + struct xlp_spi_priv *xspi = spi_master_get_devdata(master); + int ret = 0; + + xspi->cs = spi->chip_select; + xspi->dev = spi->dev; + + if (spi_transfer_is_last(master, t)) + xspi->cmd_cont = 0; + else + xspi->cmd_cont = 1; + + if (xlp_spi_txrx_bufs(xspi, t)) + ret = -EIO; + + spi_finalize_current_transfer(master); + return ret; +} + +static int xlp_spi_probe(struct platform_device *pdev) +{ + struct spi_master *master; + struct xlp_spi_priv *xspi; + struct clk *clk; + int irq, err; + + xspi = devm_kzalloc(&pdev->dev, sizeof(*xspi), GFP_KERNEL); + if (!xspi) + return -ENOMEM; + + xspi->base = devm_platform_ioremap_resource(pdev, 0); + if (IS_ERR(xspi->base)) + return PTR_ERR(xspi->base); + + irq = platform_get_irq(pdev, 0); + if (irq < 0) + return irq; + err = devm_request_irq(&pdev->dev, irq, xlp_spi_interrupt, 0, + pdev->name, xspi); + if (err) { + dev_err(&pdev->dev, "unable to request irq %d\n", irq); + return err; + } + + clk = devm_clk_get(&pdev->dev, NULL); + if (IS_ERR(clk)) { + dev_err(&pdev->dev, "could not get spi clock\n"); + return PTR_ERR(clk); + } + + xspi->spi_clk = clk_get_rate(clk); + + master = spi_alloc_master(&pdev->dev, 0); + if (!master) { + dev_err(&pdev->dev, "could not alloc master\n"); + return -ENOMEM; + } + + master->bus_num = 0; + master->num_chipselect = XLP_SPI_MAX_CS; + master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH; + master->setup = xlp_spi_setup; + master->transfer_one = xlp_spi_transfer_one; + master->dev.of_node = pdev->dev.of_node; + + init_completion(&xspi->done); + spi_master_set_devdata(master, xspi); + xlp_spi_sysctl_setup(xspi); + + /* register spi controller */ + err = devm_spi_register_master(&pdev->dev, master); + if (err) { + dev_err(&pdev->dev, "spi register master failed!\n"); + spi_master_put(master); + return err; + } + + return 0; +} + +#ifdef CONFIG_ACPI +static const struct acpi_device_id xlp_spi_acpi_match[] = { + { "BRCM900D", 0 }, + { "CAV900D", 0 }, + { }, +}; +MODULE_DEVICE_TABLE(acpi, xlp_spi_acpi_match); +#endif + +static const struct of_device_id xlp_spi_dt_id[] = { + { .compatible = "netlogic,xlp832-spi" }, + { }, +}; +MODULE_DEVICE_TABLE(of, xlp_spi_dt_id); + +static struct platform_driver xlp_spi_driver = { + .probe = xlp_spi_probe, + .driver = { + .name = "xlp-spi", + .of_match_table = xlp_spi_dt_id, + .acpi_match_table = ACPI_PTR(xlp_spi_acpi_match), + }, +}; +module_platform_driver(xlp_spi_driver); + +MODULE_AUTHOR("Kamlakant Patel <kamlakant.patel@broadcom.com>"); +MODULE_DESCRIPTION("Netlogic XLP SPI controller driver"); +MODULE_LICENSE("GPL v2"); diff --git a/drivers/spi/spi-xtensa-xtfpga.c b/drivers/spi/spi-xtensa-xtfpga.c new file mode 100644 index 000000000..fc2b5eb7d --- /dev/null +++ b/drivers/spi/spi-xtensa-xtfpga.c @@ -0,0 +1,159 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Xtensa xtfpga SPI controller driver + * + * Copyright (c) 2014 Cadence Design Systems Inc. + */ + +#include <linux/delay.h> +#include <linux/io.h> +#include <linux/module.h> +#include <linux/of.h> +#include <linux/platform_device.h> +#include <linux/spi/spi.h> +#include <linux/spi/spi_bitbang.h> + +#define XTFPGA_SPI_NAME "xtfpga_spi" + +#define XTFPGA_SPI_START 0x0 +#define XTFPGA_SPI_BUSY 0x4 +#define XTFPGA_SPI_DATA 0x8 + +#define BUSY_WAIT_US 100 + +struct xtfpga_spi { + struct spi_bitbang bitbang; + void __iomem *regs; + u32 data; + unsigned data_sz; +}; + +static inline void xtfpga_spi_write32(const struct xtfpga_spi *spi, + unsigned addr, u32 val) +{ + __raw_writel(val, spi->regs + addr); +} + +static inline unsigned int xtfpga_spi_read32(const struct xtfpga_spi *spi, + unsigned addr) +{ + return __raw_readl(spi->regs + addr); +} + +static inline void xtfpga_spi_wait_busy(struct xtfpga_spi *xspi) +{ + unsigned i; + + for (i = 0; xtfpga_spi_read32(xspi, XTFPGA_SPI_BUSY) && + i < BUSY_WAIT_US; ++i) + udelay(1); + WARN_ON_ONCE(i == BUSY_WAIT_US); +} + +static u32 xtfpga_spi_txrx_word(struct spi_device *spi, unsigned nsecs, + u32 v, u8 bits, unsigned flags) +{ + struct xtfpga_spi *xspi = spi_master_get_devdata(spi->master); + + xspi->data = (xspi->data << bits) | (v & GENMASK(bits - 1, 0)); + xspi->data_sz += bits; + if (xspi->data_sz >= 16) { + xtfpga_spi_write32(xspi, XTFPGA_SPI_DATA, + xspi->data >> (xspi->data_sz - 16)); + xspi->data_sz -= 16; + xtfpga_spi_write32(xspi, XTFPGA_SPI_START, 1); + xtfpga_spi_wait_busy(xspi); + xtfpga_spi_write32(xspi, XTFPGA_SPI_START, 0); + } + + return 0; +} + +static void xtfpga_spi_chipselect(struct spi_device *spi, int is_on) +{ + struct xtfpga_spi *xspi = spi_master_get_devdata(spi->master); + + WARN_ON(xspi->data_sz != 0); + xspi->data_sz = 0; +} + +static int xtfpga_spi_probe(struct platform_device *pdev) +{ + struct xtfpga_spi *xspi; + int ret; + struct spi_master *master; + + master = spi_alloc_master(&pdev->dev, sizeof(struct xtfpga_spi)); + if (!master) + return -ENOMEM; + + master->flags = SPI_MASTER_NO_RX; + master->bits_per_word_mask = SPI_BPW_RANGE_MASK(1, 16); + master->bus_num = pdev->dev.id; + master->dev.of_node = pdev->dev.of_node; + + xspi = spi_master_get_devdata(master); + xspi->bitbang.master = master; + xspi->bitbang.chipselect = xtfpga_spi_chipselect; + xspi->bitbang.txrx_word[SPI_MODE_0] = xtfpga_spi_txrx_word; + xspi->regs = devm_platform_ioremap_resource(pdev, 0); + if (IS_ERR(xspi->regs)) { + ret = PTR_ERR(xspi->regs); + goto err; + } + + xtfpga_spi_write32(xspi, XTFPGA_SPI_START, 0); + usleep_range(1000, 2000); + if (xtfpga_spi_read32(xspi, XTFPGA_SPI_BUSY)) { + dev_err(&pdev->dev, "Device stuck in busy state\n"); + ret = -EBUSY; + goto err; + } + + ret = spi_bitbang_start(&xspi->bitbang); + if (ret < 0) { + dev_err(&pdev->dev, "spi_bitbang_start failed\n"); + goto err; + } + + platform_set_drvdata(pdev, master); + return 0; +err: + spi_master_put(master); + return ret; +} + +static int xtfpga_spi_remove(struct platform_device *pdev) +{ + struct spi_master *master = platform_get_drvdata(pdev); + struct xtfpga_spi *xspi = spi_master_get_devdata(master); + + spi_bitbang_stop(&xspi->bitbang); + spi_master_put(master); + + return 0; +} + +MODULE_ALIAS("platform:" XTFPGA_SPI_NAME); + +#ifdef CONFIG_OF +static const struct of_device_id xtfpga_spi_of_match[] = { + { .compatible = "cdns,xtfpga-spi", }, + {} +}; +MODULE_DEVICE_TABLE(of, xtfpga_spi_of_match); +#endif + +static struct platform_driver xtfpga_spi_driver = { + .probe = xtfpga_spi_probe, + .remove = xtfpga_spi_remove, + .driver = { + .name = XTFPGA_SPI_NAME, + .of_match_table = of_match_ptr(xtfpga_spi_of_match), + }, +}; +module_platform_driver(xtfpga_spi_driver); + +MODULE_AUTHOR("Max Filippov <jcmvbkbc@gmail.com>"); +MODULE_DESCRIPTION("xtensa xtfpga SPI driver"); +MODULE_LICENSE("GPL"); diff --git a/drivers/spi/spi-zynq-qspi.c b/drivers/spi/spi-zynq-qspi.c new file mode 100644 index 000000000..13c0b15fe --- /dev/null +++ b/drivers/spi/spi-zynq-qspi.c @@ -0,0 +1,779 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * Copyright (C) 2019 Xilinx, Inc. + * + * Author: Naga Sureshkumar Relli <nagasure@xilinx.com> + */ + +#include <linux/clk.h> +#include <linux/delay.h> +#include <linux/interrupt.h> +#include <linux/io.h> +#include <linux/module.h> +#include <linux/of_irq.h> +#include <linux/of_address.h> +#include <linux/platform_device.h> +#include <linux/spi/spi.h> +#include <linux/workqueue.h> +#include <linux/spi/spi-mem.h> + +/* Register offset definitions */ +#define ZYNQ_QSPI_CONFIG_OFFSET 0x00 /* Configuration Register, RW */ +#define ZYNQ_QSPI_STATUS_OFFSET 0x04 /* Interrupt Status Register, RO */ +#define ZYNQ_QSPI_IEN_OFFSET 0x08 /* Interrupt Enable Register, WO */ +#define ZYNQ_QSPI_IDIS_OFFSET 0x0C /* Interrupt Disable Reg, WO */ +#define ZYNQ_QSPI_IMASK_OFFSET 0x10 /* Interrupt Enabled Mask Reg,RO */ +#define ZYNQ_QSPI_ENABLE_OFFSET 0x14 /* Enable/Disable Register, RW */ +#define ZYNQ_QSPI_DELAY_OFFSET 0x18 /* Delay Register, RW */ +#define ZYNQ_QSPI_TXD_00_00_OFFSET 0x1C /* Transmit 4-byte inst, WO */ +#define ZYNQ_QSPI_TXD_00_01_OFFSET 0x80 /* Transmit 1-byte inst, WO */ +#define ZYNQ_QSPI_TXD_00_10_OFFSET 0x84 /* Transmit 2-byte inst, WO */ +#define ZYNQ_QSPI_TXD_00_11_OFFSET 0x88 /* Transmit 3-byte inst, WO */ +#define ZYNQ_QSPI_RXD_OFFSET 0x20 /* Data Receive Register, RO */ +#define ZYNQ_QSPI_SIC_OFFSET 0x24 /* Slave Idle Count Register, RW */ +#define ZYNQ_QSPI_TX_THRESH_OFFSET 0x28 /* TX FIFO Watermark Reg, RW */ +#define ZYNQ_QSPI_RX_THRESH_OFFSET 0x2C /* RX FIFO Watermark Reg, RW */ +#define ZYNQ_QSPI_GPIO_OFFSET 0x30 /* GPIO Register, RW */ +#define ZYNQ_QSPI_LINEAR_CFG_OFFSET 0xA0 /* Linear Adapter Config Ref, RW */ +#define ZYNQ_QSPI_MOD_ID_OFFSET 0xFC /* Module ID Register, RO */ + +/* + * QSPI Configuration Register bit Masks + * + * This register contains various control bits that effect the operation + * of the QSPI controller + */ +#define ZYNQ_QSPI_CONFIG_IFMODE_MASK BIT(31) /* Flash Memory Interface */ +#define ZYNQ_QSPI_CONFIG_MANSRT_MASK BIT(16) /* Manual TX Start */ +#define ZYNQ_QSPI_CONFIG_MANSRTEN_MASK BIT(15) /* Enable Manual TX Mode */ +#define ZYNQ_QSPI_CONFIG_SSFORCE_MASK BIT(14) /* Manual Chip Select */ +#define ZYNQ_QSPI_CONFIG_BDRATE_MASK GENMASK(5, 3) /* Baud Rate Mask */ +#define ZYNQ_QSPI_CONFIG_CPHA_MASK BIT(2) /* Clock Phase Control */ +#define ZYNQ_QSPI_CONFIG_CPOL_MASK BIT(1) /* Clock Polarity Control */ +#define ZYNQ_QSPI_CONFIG_FWIDTH_MASK GENMASK(7, 6) /* FIFO width */ +#define ZYNQ_QSPI_CONFIG_MSTREN_MASK BIT(0) /* Master Mode */ + +/* + * QSPI Configuration Register - Baud rate and slave select + * + * These are the values used in the calculation of baud rate divisor and + * setting the slave select. + */ +#define ZYNQ_QSPI_CONFIG_BAUD_DIV_MAX GENMASK(2, 0) /* Baud rate maximum */ +#define ZYNQ_QSPI_CONFIG_BAUD_DIV_SHIFT 3 /* Baud rate divisor shift */ +#define ZYNQ_QSPI_CONFIG_PCS BIT(10) /* Peripheral Chip Select */ + +/* + * QSPI Interrupt Registers bit Masks + * + * All the four interrupt registers (Status/Mask/Enable/Disable) have the same + * bit definitions. + */ +#define ZYNQ_QSPI_IXR_RX_OVERFLOW_MASK BIT(0) /* QSPI RX FIFO Overflow */ +#define ZYNQ_QSPI_IXR_TXNFULL_MASK BIT(2) /* QSPI TX FIFO Overflow */ +#define ZYNQ_QSPI_IXR_TXFULL_MASK BIT(3) /* QSPI TX FIFO is full */ +#define ZYNQ_QSPI_IXR_RXNEMTY_MASK BIT(4) /* QSPI RX FIFO Not Empty */ +#define ZYNQ_QSPI_IXR_RXF_FULL_MASK BIT(5) /* QSPI RX FIFO is full */ +#define ZYNQ_QSPI_IXR_TXF_UNDRFLOW_MASK BIT(6) /* QSPI TX FIFO Underflow */ +#define ZYNQ_QSPI_IXR_ALL_MASK (ZYNQ_QSPI_IXR_RX_OVERFLOW_MASK | \ + ZYNQ_QSPI_IXR_TXNFULL_MASK | \ + ZYNQ_QSPI_IXR_TXFULL_MASK | \ + ZYNQ_QSPI_IXR_RXNEMTY_MASK | \ + ZYNQ_QSPI_IXR_RXF_FULL_MASK | \ + ZYNQ_QSPI_IXR_TXF_UNDRFLOW_MASK) +#define ZYNQ_QSPI_IXR_RXTX_MASK (ZYNQ_QSPI_IXR_TXNFULL_MASK | \ + ZYNQ_QSPI_IXR_RXNEMTY_MASK) + +/* + * QSPI Enable Register bit Masks + * + * This register is used to enable or disable the QSPI controller + */ +#define ZYNQ_QSPI_ENABLE_ENABLE_MASK BIT(0) /* QSPI Enable Bit Mask */ + +/* + * QSPI Linear Configuration Register + * + * It is named Linear Configuration but it controls other modes when not in + * linear mode also. + */ +#define ZYNQ_QSPI_LCFG_TWO_MEM BIT(30) /* LQSPI Two memories */ +#define ZYNQ_QSPI_LCFG_SEP_BUS BIT(29) /* LQSPI Separate bus */ +#define ZYNQ_QSPI_LCFG_U_PAGE BIT(28) /* LQSPI Upper Page */ + +#define ZYNQ_QSPI_LCFG_DUMMY_SHIFT 8 + +#define ZYNQ_QSPI_FAST_READ_QOUT_CODE 0x6B /* read instruction code */ +#define ZYNQ_QSPI_FIFO_DEPTH 63 /* FIFO depth in words */ +#define ZYNQ_QSPI_RX_THRESHOLD 32 /* Rx FIFO threshold level */ +#define ZYNQ_QSPI_TX_THRESHOLD 1 /* Tx FIFO threshold level */ + +/* + * The modebits configurable by the driver to make the SPI support different + * data formats + */ +#define ZYNQ_QSPI_MODEBITS (SPI_CPOL | SPI_CPHA) + +/* Maximum number of chip selects */ +#define ZYNQ_QSPI_MAX_NUM_CS 2 + +/** + * struct zynq_qspi - Defines qspi driver instance + * @dev: Pointer to the this device's information + * @regs: Virtual address of the QSPI controller registers + * @refclk: Pointer to the peripheral clock + * @pclk: Pointer to the APB clock + * @irq: IRQ number + * @txbuf: Pointer to the TX buffer + * @rxbuf: Pointer to the RX buffer + * @tx_bytes: Number of bytes left to transfer + * @rx_bytes: Number of bytes left to receive + * @data_completion: completion structure + */ +struct zynq_qspi { + struct device *dev; + void __iomem *regs; + struct clk *refclk; + struct clk *pclk; + int irq; + u8 *txbuf; + u8 *rxbuf; + int tx_bytes; + int rx_bytes; + struct completion data_completion; +}; + +/* + * Inline functions for the QSPI controller read/write + */ +static inline u32 zynq_qspi_read(struct zynq_qspi *xqspi, u32 offset) +{ + return readl_relaxed(xqspi->regs + offset); +} + +static inline void zynq_qspi_write(struct zynq_qspi *xqspi, u32 offset, + u32 val) +{ + writel_relaxed(val, xqspi->regs + offset); +} + +/** + * zynq_qspi_init_hw - Initialize the hardware + * @xqspi: Pointer to the zynq_qspi structure + * @num_cs: Number of connected CS (to enable dual memories if needed) + * + * The default settings of the QSPI controller's configurable parameters on + * reset are + * - Master mode + * - Baud rate divisor is set to 2 + * - Tx threshold set to 1l Rx threshold set to 32 + * - Flash memory interface mode enabled + * - Size of the word to be transferred as 8 bit + * This function performs the following actions + * - Disable and clear all the interrupts + * - Enable manual slave select + * - Enable manual start + * - Deselect all the chip select lines + * - Set the size of the word to be transferred as 32 bit + * - Set the little endian mode of TX FIFO and + * - Enable the QSPI controller + */ +static void zynq_qspi_init_hw(struct zynq_qspi *xqspi, unsigned int num_cs) +{ + u32 config_reg; + + zynq_qspi_write(xqspi, ZYNQ_QSPI_ENABLE_OFFSET, 0); + zynq_qspi_write(xqspi, ZYNQ_QSPI_IDIS_OFFSET, ZYNQ_QSPI_IXR_ALL_MASK); + + /* Disable linear mode as the boot loader may have used it */ + config_reg = 0; + /* At the same time, enable dual mode if more than 1 CS is available */ + if (num_cs > 1) + config_reg |= ZYNQ_QSPI_LCFG_TWO_MEM; + + zynq_qspi_write(xqspi, ZYNQ_QSPI_LINEAR_CFG_OFFSET, config_reg); + + /* Clear the RX FIFO */ + while (zynq_qspi_read(xqspi, ZYNQ_QSPI_STATUS_OFFSET) & + ZYNQ_QSPI_IXR_RXNEMTY_MASK) + zynq_qspi_read(xqspi, ZYNQ_QSPI_RXD_OFFSET); + + zynq_qspi_write(xqspi, ZYNQ_QSPI_STATUS_OFFSET, ZYNQ_QSPI_IXR_ALL_MASK); + config_reg = zynq_qspi_read(xqspi, ZYNQ_QSPI_CONFIG_OFFSET); + config_reg &= ~(ZYNQ_QSPI_CONFIG_MSTREN_MASK | + ZYNQ_QSPI_CONFIG_CPOL_MASK | + ZYNQ_QSPI_CONFIG_CPHA_MASK | + ZYNQ_QSPI_CONFIG_BDRATE_MASK | + ZYNQ_QSPI_CONFIG_SSFORCE_MASK | + ZYNQ_QSPI_CONFIG_MANSRTEN_MASK | + ZYNQ_QSPI_CONFIG_MANSRT_MASK); + config_reg |= (ZYNQ_QSPI_CONFIG_MSTREN_MASK | + ZYNQ_QSPI_CONFIG_SSFORCE_MASK | + ZYNQ_QSPI_CONFIG_FWIDTH_MASK | + ZYNQ_QSPI_CONFIG_IFMODE_MASK); + zynq_qspi_write(xqspi, ZYNQ_QSPI_CONFIG_OFFSET, config_reg); + + zynq_qspi_write(xqspi, ZYNQ_QSPI_RX_THRESH_OFFSET, + ZYNQ_QSPI_RX_THRESHOLD); + zynq_qspi_write(xqspi, ZYNQ_QSPI_TX_THRESH_OFFSET, + ZYNQ_QSPI_TX_THRESHOLD); + + zynq_qspi_write(xqspi, ZYNQ_QSPI_ENABLE_OFFSET, + ZYNQ_QSPI_ENABLE_ENABLE_MASK); +} + +static bool zynq_qspi_supports_op(struct spi_mem *mem, + const struct spi_mem_op *op) +{ + if (!spi_mem_default_supports_op(mem, op)) + return false; + + /* + * The number of address bytes should be equal to or less than 3 bytes. + */ + if (op->addr.nbytes > 3) + return false; + + return true; +} + +/** + * zynq_qspi_rxfifo_op - Read 1..4 bytes from RxFIFO to RX buffer + * @xqspi: Pointer to the zynq_qspi structure + * @size: Number of bytes to be read (1..4) + */ +static void zynq_qspi_rxfifo_op(struct zynq_qspi *xqspi, unsigned int size) +{ + u32 data; + + data = zynq_qspi_read(xqspi, ZYNQ_QSPI_RXD_OFFSET); + + if (xqspi->rxbuf) { + memcpy(xqspi->rxbuf, ((u8 *)&data) + 4 - size, size); + xqspi->rxbuf += size; + } + + xqspi->rx_bytes -= size; + if (xqspi->rx_bytes < 0) + xqspi->rx_bytes = 0; +} + +/** + * zynq_qspi_txfifo_op - Write 1..4 bytes from TX buffer to TxFIFO + * @xqspi: Pointer to the zynq_qspi structure + * @size: Number of bytes to be written (1..4) + */ +static void zynq_qspi_txfifo_op(struct zynq_qspi *xqspi, unsigned int size) +{ + static const unsigned int offset[4] = { + ZYNQ_QSPI_TXD_00_01_OFFSET, ZYNQ_QSPI_TXD_00_10_OFFSET, + ZYNQ_QSPI_TXD_00_11_OFFSET, ZYNQ_QSPI_TXD_00_00_OFFSET }; + u32 data; + + if (xqspi->txbuf) { + data = 0xffffffff; + memcpy(&data, xqspi->txbuf, size); + xqspi->txbuf += size; + } else { + data = 0; + } + + xqspi->tx_bytes -= size; + zynq_qspi_write(xqspi, offset[size - 1], data); +} + +/** + * zynq_qspi_chipselect - Select or deselect the chip select line + * @spi: Pointer to the spi_device structure + * @assert: 1 for select or 0 for deselect the chip select line + */ +static void zynq_qspi_chipselect(struct spi_device *spi, bool assert) +{ + struct spi_controller *ctlr = spi->master; + struct zynq_qspi *xqspi = spi_controller_get_devdata(ctlr); + u32 config_reg; + + /* Select the lower (CS0) or upper (CS1) memory */ + if (ctlr->num_chipselect > 1) { + config_reg = zynq_qspi_read(xqspi, ZYNQ_QSPI_LINEAR_CFG_OFFSET); + if (!spi->chip_select) + config_reg &= ~ZYNQ_QSPI_LCFG_U_PAGE; + else + config_reg |= ZYNQ_QSPI_LCFG_U_PAGE; + + zynq_qspi_write(xqspi, ZYNQ_QSPI_LINEAR_CFG_OFFSET, config_reg); + } + + /* Ground the line to assert the CS */ + config_reg = zynq_qspi_read(xqspi, ZYNQ_QSPI_CONFIG_OFFSET); + if (assert) + config_reg &= ~ZYNQ_QSPI_CONFIG_PCS; + else + config_reg |= ZYNQ_QSPI_CONFIG_PCS; + + zynq_qspi_write(xqspi, ZYNQ_QSPI_CONFIG_OFFSET, config_reg); +} + +/** + * zynq_qspi_config_op - Configure QSPI controller for specified transfer + * @xqspi: Pointer to the zynq_qspi structure + * @spi: Pointer to the spi_device structure + * + * Sets the operational mode of QSPI controller for the next QSPI transfer and + * sets the requested clock frequency. + * + * Return: 0 on success and -EINVAL on invalid input parameter + * + * Note: If the requested frequency is not an exact match with what can be + * obtained using the prescalar value, the driver sets the clock frequency which + * is lower than the requested frequency (maximum lower) for the transfer. If + * the requested frequency is higher or lower than that is supported by the QSPI + * controller the driver will set the highest or lowest frequency supported by + * controller. + */ +static int zynq_qspi_config_op(struct zynq_qspi *xqspi, struct spi_device *spi) +{ + u32 config_reg, baud_rate_val = 0; + + /* + * Set the clock frequency + * The baud rate divisor is not a direct mapping to the value written + * into the configuration register (config_reg[5:3]) + * i.e. 000 - divide by 2 + * 001 - divide by 4 + * ---------------- + * 111 - divide by 256 + */ + while ((baud_rate_val < ZYNQ_QSPI_CONFIG_BAUD_DIV_MAX) && + (clk_get_rate(xqspi->refclk) / (2 << baud_rate_val)) > + spi->max_speed_hz) + baud_rate_val++; + + config_reg = zynq_qspi_read(xqspi, ZYNQ_QSPI_CONFIG_OFFSET); + + /* Set the QSPI clock phase and clock polarity */ + config_reg &= (~ZYNQ_QSPI_CONFIG_CPHA_MASK) & + (~ZYNQ_QSPI_CONFIG_CPOL_MASK); + if (spi->mode & SPI_CPHA) + config_reg |= ZYNQ_QSPI_CONFIG_CPHA_MASK; + if (spi->mode & SPI_CPOL) + config_reg |= ZYNQ_QSPI_CONFIG_CPOL_MASK; + + config_reg &= ~ZYNQ_QSPI_CONFIG_BDRATE_MASK; + config_reg |= (baud_rate_val << ZYNQ_QSPI_CONFIG_BAUD_DIV_SHIFT); + zynq_qspi_write(xqspi, ZYNQ_QSPI_CONFIG_OFFSET, config_reg); + + return 0; +} + +/** + * zynq_qspi_setup - Configure the QSPI controller + * @spi: Pointer to the spi_device structure + * + * Sets the operational mode of QSPI controller for the next QSPI transfer, baud + * rate and divisor value to setup the requested qspi clock. + * + * Return: 0 on success and error value on failure + */ +static int zynq_qspi_setup_op(struct spi_device *spi) +{ + struct spi_controller *ctlr = spi->master; + struct zynq_qspi *qspi = spi_controller_get_devdata(ctlr); + + if (ctlr->busy) + return -EBUSY; + + clk_enable(qspi->refclk); + clk_enable(qspi->pclk); + zynq_qspi_write(qspi, ZYNQ_QSPI_ENABLE_OFFSET, + ZYNQ_QSPI_ENABLE_ENABLE_MASK); + + return 0; +} + +/** + * zynq_qspi_write_op - Fills the TX FIFO with as many bytes as possible + * @xqspi: Pointer to the zynq_qspi structure + * @txcount: Maximum number of words to write + * @txempty: Indicates that TxFIFO is empty + */ +static void zynq_qspi_write_op(struct zynq_qspi *xqspi, int txcount, + bool txempty) +{ + int count, len, k; + + len = xqspi->tx_bytes; + if (len && len < 4) { + /* + * We must empty the TxFIFO between accesses to TXD0, + * TXD1, TXD2, TXD3. + */ + if (txempty) + zynq_qspi_txfifo_op(xqspi, len); + + return; + } + + count = len / 4; + if (count > txcount) + count = txcount; + + if (xqspi->txbuf) { + iowrite32_rep(xqspi->regs + ZYNQ_QSPI_TXD_00_00_OFFSET, + xqspi->txbuf, count); + xqspi->txbuf += count * 4; + } else { + for (k = 0; k < count; k++) + writel_relaxed(0, xqspi->regs + + ZYNQ_QSPI_TXD_00_00_OFFSET); + } + + xqspi->tx_bytes -= count * 4; +} + +/** + * zynq_qspi_read_op - Drains the RX FIFO by as many bytes as possible + * @xqspi: Pointer to the zynq_qspi structure + * @rxcount: Maximum number of words to read + */ +static void zynq_qspi_read_op(struct zynq_qspi *xqspi, int rxcount) +{ + int count, len, k; + + len = xqspi->rx_bytes - xqspi->tx_bytes; + count = len / 4; + if (count > rxcount) + count = rxcount; + if (xqspi->rxbuf) { + ioread32_rep(xqspi->regs + ZYNQ_QSPI_RXD_OFFSET, + xqspi->rxbuf, count); + xqspi->rxbuf += count * 4; + } else { + for (k = 0; k < count; k++) + readl_relaxed(xqspi->regs + ZYNQ_QSPI_RXD_OFFSET); + } + xqspi->rx_bytes -= count * 4; + len -= count * 4; + + if (len && len < 4 && count < rxcount) + zynq_qspi_rxfifo_op(xqspi, len); +} + +/** + * zynq_qspi_irq - Interrupt service routine of the QSPI controller + * @irq: IRQ number + * @dev_id: Pointer to the xqspi structure + * + * This function handles TX empty only. + * On TX empty interrupt this function reads the received data from RX FIFO and + * fills the TX FIFO if there is any data remaining to be transferred. + * + * Return: IRQ_HANDLED when interrupt is handled; IRQ_NONE otherwise. + */ +static irqreturn_t zynq_qspi_irq(int irq, void *dev_id) +{ + u32 intr_status; + bool txempty; + struct zynq_qspi *xqspi = (struct zynq_qspi *)dev_id; + + intr_status = zynq_qspi_read(xqspi, ZYNQ_QSPI_STATUS_OFFSET); + zynq_qspi_write(xqspi, ZYNQ_QSPI_STATUS_OFFSET, intr_status); + + if ((intr_status & ZYNQ_QSPI_IXR_TXNFULL_MASK) || + (intr_status & ZYNQ_QSPI_IXR_RXNEMTY_MASK)) { + /* + * This bit is set when Tx FIFO has < THRESHOLD entries. + * We have the THRESHOLD value set to 1, + * so this bit indicates Tx FIFO is empty. + */ + txempty = !!(intr_status & ZYNQ_QSPI_IXR_TXNFULL_MASK); + /* Read out the data from the RX FIFO */ + zynq_qspi_read_op(xqspi, ZYNQ_QSPI_RX_THRESHOLD); + if (xqspi->tx_bytes) { + /* There is more data to send */ + zynq_qspi_write_op(xqspi, ZYNQ_QSPI_RX_THRESHOLD, + txempty); + } else { + /* + * If transfer and receive is completed then only send + * complete signal. + */ + if (!xqspi->rx_bytes) { + zynq_qspi_write(xqspi, + ZYNQ_QSPI_IDIS_OFFSET, + ZYNQ_QSPI_IXR_RXTX_MASK); + complete(&xqspi->data_completion); + } + } + return IRQ_HANDLED; + } + + return IRQ_NONE; +} + +/** + * zynq_qspi_exec_mem_op() - Initiates the QSPI transfer + * @mem: the SPI memory + * @op: the memory operation to execute + * + * Executes a memory operation. + * + * This function first selects the chip and starts the memory operation. + * + * Return: 0 in case of success, a negative error code otherwise. + */ +static int zynq_qspi_exec_mem_op(struct spi_mem *mem, + const struct spi_mem_op *op) +{ + struct zynq_qspi *xqspi = spi_controller_get_devdata(mem->spi->master); + int err = 0, i; + u8 *tmpbuf; + + dev_dbg(xqspi->dev, "cmd:%#x mode:%d.%d.%d.%d\n", + op->cmd.opcode, op->cmd.buswidth, op->addr.buswidth, + op->dummy.buswidth, op->data.buswidth); + + zynq_qspi_chipselect(mem->spi, true); + zynq_qspi_config_op(xqspi, mem->spi); + + if (op->cmd.opcode) { + reinit_completion(&xqspi->data_completion); + xqspi->txbuf = (u8 *)&op->cmd.opcode; + xqspi->rxbuf = NULL; + xqspi->tx_bytes = op->cmd.nbytes; + xqspi->rx_bytes = op->cmd.nbytes; + zynq_qspi_write_op(xqspi, ZYNQ_QSPI_FIFO_DEPTH, true); + zynq_qspi_write(xqspi, ZYNQ_QSPI_IEN_OFFSET, + ZYNQ_QSPI_IXR_RXTX_MASK); + if (!wait_for_completion_timeout(&xqspi->data_completion, + msecs_to_jiffies(1000))) + err = -ETIMEDOUT; + } + + if (op->addr.nbytes) { + for (i = 0; i < op->addr.nbytes; i++) { + xqspi->txbuf[i] = op->addr.val >> + (8 * (op->addr.nbytes - i - 1)); + } + + reinit_completion(&xqspi->data_completion); + xqspi->rxbuf = NULL; + xqspi->tx_bytes = op->addr.nbytes; + xqspi->rx_bytes = op->addr.nbytes; + zynq_qspi_write_op(xqspi, ZYNQ_QSPI_FIFO_DEPTH, true); + zynq_qspi_write(xqspi, ZYNQ_QSPI_IEN_OFFSET, + ZYNQ_QSPI_IXR_RXTX_MASK); + if (!wait_for_completion_timeout(&xqspi->data_completion, + msecs_to_jiffies(1000))) + err = -ETIMEDOUT; + } + + if (op->dummy.nbytes) { + tmpbuf = kzalloc(op->dummy.nbytes, GFP_KERNEL); + if (!tmpbuf) + return -ENOMEM; + + memset(tmpbuf, 0xff, op->dummy.nbytes); + reinit_completion(&xqspi->data_completion); + xqspi->txbuf = tmpbuf; + xqspi->rxbuf = NULL; + xqspi->tx_bytes = op->dummy.nbytes; + xqspi->rx_bytes = op->dummy.nbytes; + zynq_qspi_write_op(xqspi, ZYNQ_QSPI_FIFO_DEPTH, true); + zynq_qspi_write(xqspi, ZYNQ_QSPI_IEN_OFFSET, + ZYNQ_QSPI_IXR_RXTX_MASK); + if (!wait_for_completion_timeout(&xqspi->data_completion, + msecs_to_jiffies(1000))) + err = -ETIMEDOUT; + + kfree(tmpbuf); + } + + if (op->data.nbytes) { + reinit_completion(&xqspi->data_completion); + if (op->data.dir == SPI_MEM_DATA_OUT) { + xqspi->txbuf = (u8 *)op->data.buf.out; + xqspi->tx_bytes = op->data.nbytes; + xqspi->rxbuf = NULL; + xqspi->rx_bytes = op->data.nbytes; + } else { + xqspi->txbuf = NULL; + xqspi->rxbuf = (u8 *)op->data.buf.in; + xqspi->rx_bytes = op->data.nbytes; + xqspi->tx_bytes = op->data.nbytes; + } + + zynq_qspi_write_op(xqspi, ZYNQ_QSPI_FIFO_DEPTH, true); + zynq_qspi_write(xqspi, ZYNQ_QSPI_IEN_OFFSET, + ZYNQ_QSPI_IXR_RXTX_MASK); + if (!wait_for_completion_timeout(&xqspi->data_completion, + msecs_to_jiffies(1000))) + err = -ETIMEDOUT; + } + zynq_qspi_chipselect(mem->spi, false); + + return err; +} + +static const struct spi_controller_mem_ops zynq_qspi_mem_ops = { + .supports_op = zynq_qspi_supports_op, + .exec_op = zynq_qspi_exec_mem_op, +}; + +/** + * zynq_qspi_probe - Probe method for the QSPI driver + * @pdev: Pointer to the platform_device structure + * + * This function initializes the driver data structures and the hardware. + * + * Return: 0 on success and error value on failure + */ +static int zynq_qspi_probe(struct platform_device *pdev) +{ + int ret = 0; + struct spi_controller *ctlr; + struct device *dev = &pdev->dev; + struct device_node *np = dev->of_node; + struct zynq_qspi *xqspi; + u32 num_cs; + + ctlr = spi_alloc_master(&pdev->dev, sizeof(*xqspi)); + if (!ctlr) + return -ENOMEM; + + xqspi = spi_controller_get_devdata(ctlr); + xqspi->dev = dev; + platform_set_drvdata(pdev, xqspi); + xqspi->regs = devm_platform_ioremap_resource(pdev, 0); + if (IS_ERR(xqspi->regs)) { + ret = PTR_ERR(xqspi->regs); + goto remove_master; + } + + xqspi->pclk = devm_clk_get(&pdev->dev, "pclk"); + if (IS_ERR(xqspi->pclk)) { + dev_err(&pdev->dev, "pclk clock not found.\n"); + ret = PTR_ERR(xqspi->pclk); + goto remove_master; + } + + init_completion(&xqspi->data_completion); + + xqspi->refclk = devm_clk_get(&pdev->dev, "ref_clk"); + if (IS_ERR(xqspi->refclk)) { + dev_err(&pdev->dev, "ref_clk clock not found.\n"); + ret = PTR_ERR(xqspi->refclk); + goto remove_master; + } + + ret = clk_prepare_enable(xqspi->pclk); + if (ret) { + dev_err(&pdev->dev, "Unable to enable APB clock.\n"); + goto remove_master; + } + + ret = clk_prepare_enable(xqspi->refclk); + if (ret) { + dev_err(&pdev->dev, "Unable to enable device clock.\n"); + goto clk_dis_pclk; + } + + xqspi->irq = platform_get_irq(pdev, 0); + if (xqspi->irq <= 0) { + ret = -ENXIO; + goto clk_dis_all; + } + ret = devm_request_irq(&pdev->dev, xqspi->irq, zynq_qspi_irq, + 0, pdev->name, xqspi); + if (ret != 0) { + ret = -ENXIO; + dev_err(&pdev->dev, "request_irq failed\n"); + goto clk_dis_all; + } + + ret = of_property_read_u32(np, "num-cs", + &num_cs); + if (ret < 0) { + ctlr->num_chipselect = 1; + } else if (num_cs > ZYNQ_QSPI_MAX_NUM_CS) { + ret = -EINVAL; + dev_err(&pdev->dev, "only 2 chip selects are available\n"); + goto clk_dis_all; + } else { + ctlr->num_chipselect = num_cs; + } + + ctlr->mode_bits = SPI_RX_DUAL | SPI_RX_QUAD | + SPI_TX_DUAL | SPI_TX_QUAD; + ctlr->mem_ops = &zynq_qspi_mem_ops; + ctlr->setup = zynq_qspi_setup_op; + ctlr->max_speed_hz = clk_get_rate(xqspi->refclk) / 2; + ctlr->dev.of_node = np; + + /* QSPI controller initializations */ + zynq_qspi_init_hw(xqspi, ctlr->num_chipselect); + + ret = devm_spi_register_controller(&pdev->dev, ctlr); + if (ret) { + dev_err(&pdev->dev, "spi_register_master failed\n"); + goto clk_dis_all; + } + + return ret; + +clk_dis_all: + clk_disable_unprepare(xqspi->refclk); +clk_dis_pclk: + clk_disable_unprepare(xqspi->pclk); +remove_master: + spi_controller_put(ctlr); + + return ret; +} + +/** + * zynq_qspi_remove - Remove method for the QSPI driver + * @pdev: Pointer to the platform_device structure + * + * This function is called if a device is physically removed from the system or + * if the driver module is being unloaded. It frees all resources allocated to + * the device. + * + * Return: 0 on success and error value on failure + */ +static int zynq_qspi_remove(struct platform_device *pdev) +{ + struct zynq_qspi *xqspi = platform_get_drvdata(pdev); + + zynq_qspi_write(xqspi, ZYNQ_QSPI_ENABLE_OFFSET, 0); + + clk_disable_unprepare(xqspi->refclk); + clk_disable_unprepare(xqspi->pclk); + + return 0; +} + +static const struct of_device_id zynq_qspi_of_match[] = { + { .compatible = "xlnx,zynq-qspi-1.0", }, + { /* end of table */ } +}; + +MODULE_DEVICE_TABLE(of, zynq_qspi_of_match); + +/* + * zynq_qspi_driver - This structure defines the QSPI platform driver + */ +static struct platform_driver zynq_qspi_driver = { + .probe = zynq_qspi_probe, + .remove = zynq_qspi_remove, + .driver = { + .name = "zynq-qspi", + .of_match_table = zynq_qspi_of_match, + }, +}; + +module_platform_driver(zynq_qspi_driver); + +MODULE_AUTHOR("Xilinx, Inc."); +MODULE_DESCRIPTION("Xilinx Zynq QSPI driver"); +MODULE_LICENSE("GPL"); diff --git a/drivers/spi/spi-zynqmp-gqspi.c b/drivers/spi/spi-zynqmp-gqspi.c new file mode 100644 index 000000000..3d3ac4824 --- /dev/null +++ b/drivers/spi/spi-zynqmp-gqspi.c @@ -0,0 +1,1246 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Xilinx Zynq UltraScale+ MPSoC Quad-SPI (QSPI) controller driver + * (master mode only) + * + * Copyright (C) 2009 - 2015 Xilinx, Inc. + */ + +#include <linux/clk.h> +#include <linux/delay.h> +#include <linux/dma-mapping.h> +#include <linux/dmaengine.h> +#include <linux/firmware/xlnx-zynqmp.h> +#include <linux/interrupt.h> +#include <linux/io.h> +#include <linux/module.h> +#include <linux/of_irq.h> +#include <linux/of_address.h> +#include <linux/platform_device.h> +#include <linux/pm_runtime.h> +#include <linux/spi/spi.h> +#include <linux/spinlock.h> +#include <linux/workqueue.h> +#include <linux/spi/spi-mem.h> + +/* Generic QSPI register offsets */ +#define GQSPI_CONFIG_OFST 0x00000100 +#define GQSPI_ISR_OFST 0x00000104 +#define GQSPI_IDR_OFST 0x0000010C +#define GQSPI_IER_OFST 0x00000108 +#define GQSPI_IMASK_OFST 0x00000110 +#define GQSPI_EN_OFST 0x00000114 +#define GQSPI_TXD_OFST 0x0000011C +#define GQSPI_RXD_OFST 0x00000120 +#define GQSPI_TX_THRESHOLD_OFST 0x00000128 +#define GQSPI_RX_THRESHOLD_OFST 0x0000012C +#define GQSPI_LPBK_DLY_ADJ_OFST 0x00000138 +#define GQSPI_GEN_FIFO_OFST 0x00000140 +#define GQSPI_SEL_OFST 0x00000144 +#define GQSPI_GF_THRESHOLD_OFST 0x00000150 +#define GQSPI_FIFO_CTRL_OFST 0x0000014C +#define GQSPI_QSPIDMA_DST_CTRL_OFST 0x0000080C +#define GQSPI_QSPIDMA_DST_SIZE_OFST 0x00000804 +#define GQSPI_QSPIDMA_DST_STS_OFST 0x00000808 +#define GQSPI_QSPIDMA_DST_I_STS_OFST 0x00000814 +#define GQSPI_QSPIDMA_DST_I_EN_OFST 0x00000818 +#define GQSPI_QSPIDMA_DST_I_DIS_OFST 0x0000081C +#define GQSPI_QSPIDMA_DST_I_MASK_OFST 0x00000820 +#define GQSPI_QSPIDMA_DST_ADDR_OFST 0x00000800 +#define GQSPI_QSPIDMA_DST_ADDR_MSB_OFST 0x00000828 + +/* GQSPI register bit masks */ +#define GQSPI_SEL_MASK 0x00000001 +#define GQSPI_EN_MASK 0x00000001 +#define GQSPI_LPBK_DLY_ADJ_USE_LPBK_MASK 0x00000020 +#define GQSPI_ISR_WR_TO_CLR_MASK 0x00000002 +#define GQSPI_IDR_ALL_MASK 0x00000FBE +#define GQSPI_CFG_MODE_EN_MASK 0xC0000000 +#define GQSPI_CFG_GEN_FIFO_START_MODE_MASK 0x20000000 +#define GQSPI_CFG_ENDIAN_MASK 0x04000000 +#define GQSPI_CFG_EN_POLL_TO_MASK 0x00100000 +#define GQSPI_CFG_WP_HOLD_MASK 0x00080000 +#define GQSPI_CFG_BAUD_RATE_DIV_MASK 0x00000038 +#define GQSPI_CFG_CLK_PHA_MASK 0x00000004 +#define GQSPI_CFG_CLK_POL_MASK 0x00000002 +#define GQSPI_CFG_START_GEN_FIFO_MASK 0x10000000 +#define GQSPI_GENFIFO_IMM_DATA_MASK 0x000000FF +#define GQSPI_GENFIFO_DATA_XFER 0x00000100 +#define GQSPI_GENFIFO_EXP 0x00000200 +#define GQSPI_GENFIFO_MODE_SPI 0x00000400 +#define GQSPI_GENFIFO_MODE_DUALSPI 0x00000800 +#define GQSPI_GENFIFO_MODE_QUADSPI 0x00000C00 +#define GQSPI_GENFIFO_MODE_MASK 0x00000C00 +#define GQSPI_GENFIFO_CS_LOWER 0x00001000 +#define GQSPI_GENFIFO_CS_UPPER 0x00002000 +#define GQSPI_GENFIFO_BUS_LOWER 0x00004000 +#define GQSPI_GENFIFO_BUS_UPPER 0x00008000 +#define GQSPI_GENFIFO_BUS_BOTH 0x0000C000 +#define GQSPI_GENFIFO_BUS_MASK 0x0000C000 +#define GQSPI_GENFIFO_TX 0x00010000 +#define GQSPI_GENFIFO_RX 0x00020000 +#define GQSPI_GENFIFO_STRIPE 0x00040000 +#define GQSPI_GENFIFO_POLL 0x00080000 +#define GQSPI_GENFIFO_EXP_START 0x00000100 +#define GQSPI_FIFO_CTRL_RST_RX_FIFO_MASK 0x00000004 +#define GQSPI_FIFO_CTRL_RST_TX_FIFO_MASK 0x00000002 +#define GQSPI_FIFO_CTRL_RST_GEN_FIFO_MASK 0x00000001 +#define GQSPI_ISR_RXEMPTY_MASK 0x00000800 +#define GQSPI_ISR_GENFIFOFULL_MASK 0x00000400 +#define GQSPI_ISR_GENFIFONOT_FULL_MASK 0x00000200 +#define GQSPI_ISR_TXEMPTY_MASK 0x00000100 +#define GQSPI_ISR_GENFIFOEMPTY_MASK 0x00000080 +#define GQSPI_ISR_RXFULL_MASK 0x00000020 +#define GQSPI_ISR_RXNEMPTY_MASK 0x00000010 +#define GQSPI_ISR_TXFULL_MASK 0x00000008 +#define GQSPI_ISR_TXNOT_FULL_MASK 0x00000004 +#define GQSPI_ISR_POLL_TIME_EXPIRE_MASK 0x00000002 +#define GQSPI_IER_TXNOT_FULL_MASK 0x00000004 +#define GQSPI_IER_RXEMPTY_MASK 0x00000800 +#define GQSPI_IER_POLL_TIME_EXPIRE_MASK 0x00000002 +#define GQSPI_IER_RXNEMPTY_MASK 0x00000010 +#define GQSPI_IER_GENFIFOEMPTY_MASK 0x00000080 +#define GQSPI_IER_TXEMPTY_MASK 0x00000100 +#define GQSPI_QSPIDMA_DST_INTR_ALL_MASK 0x000000FE +#define GQSPI_QSPIDMA_DST_STS_WTC 0x0000E000 +#define GQSPI_CFG_MODE_EN_DMA_MASK 0x80000000 +#define GQSPI_ISR_IDR_MASK 0x00000994 +#define GQSPI_QSPIDMA_DST_I_EN_DONE_MASK 0x00000002 +#define GQSPI_QSPIDMA_DST_I_STS_DONE_MASK 0x00000002 +#define GQSPI_IRQ_MASK 0x00000980 + +#define GQSPI_CFG_BAUD_RATE_DIV_SHIFT 3 +#define GQSPI_GENFIFO_CS_SETUP 0x4 +#define GQSPI_GENFIFO_CS_HOLD 0x3 +#define GQSPI_TXD_DEPTH 64 +#define GQSPI_RX_FIFO_THRESHOLD 32 +#define GQSPI_RX_FIFO_FILL (GQSPI_RX_FIFO_THRESHOLD * 4) +#define GQSPI_TX_FIFO_THRESHOLD_RESET_VAL 32 +#define GQSPI_TX_FIFO_FILL (GQSPI_TXD_DEPTH -\ + GQSPI_TX_FIFO_THRESHOLD_RESET_VAL) +#define GQSPI_GEN_FIFO_THRESHOLD_RESET_VAL 0X10 +#define GQSPI_QSPIDMA_DST_CTRL_RESET_VAL 0x803FFA00 +#define GQSPI_SELECT_FLASH_CS_LOWER 0x1 +#define GQSPI_SELECT_FLASH_CS_UPPER 0x2 +#define GQSPI_SELECT_FLASH_CS_BOTH 0x3 +#define GQSPI_SELECT_FLASH_BUS_LOWER 0x1 +#define GQSPI_SELECT_FLASH_BUS_UPPER 0x2 +#define GQSPI_SELECT_FLASH_BUS_BOTH 0x3 +#define GQSPI_BAUD_DIV_MAX 7 /* Baud rate divisor maximum */ +#define GQSPI_BAUD_DIV_SHIFT 2 /* Baud rate divisor shift */ +#define GQSPI_SELECT_MODE_SPI 0x1 +#define GQSPI_SELECT_MODE_DUALSPI 0x2 +#define GQSPI_SELECT_MODE_QUADSPI 0x4 +#define GQSPI_DMA_UNALIGN 0x3 +#define GQSPI_DEFAULT_NUM_CS 1 /* Default number of chip selects */ + +#define SPI_AUTOSUSPEND_TIMEOUT 3000 +enum mode_type {GQSPI_MODE_IO, GQSPI_MODE_DMA}; + +/** + * struct zynqmp_qspi - Defines qspi driver instance + * @regs: Virtual address of the QSPI controller registers + * @refclk: Pointer to the peripheral clock + * @pclk: Pointer to the APB clock + * @irq: IRQ number + * @dev: Pointer to struct device + * @txbuf: Pointer to the TX buffer + * @rxbuf: Pointer to the RX buffer + * @bytes_to_transfer: Number of bytes left to transfer + * @bytes_to_receive: Number of bytes left to receive + * @genfifocs: Used for chip select + * @genfifobus: Used to select the upper or lower bus + * @dma_rx_bytes: Remaining bytes to receive by DMA mode + * @dma_addr: DMA address after mapping the kernel buffer + * @genfifoentry: Used for storing the genfifoentry instruction. + * @mode: Defines the mode in which QSPI is operating + * @data_completion: completion structure + */ +struct zynqmp_qspi { + struct spi_controller *ctlr; + void __iomem *regs; + struct clk *refclk; + struct clk *pclk; + int irq; + struct device *dev; + const void *txbuf; + void *rxbuf; + int bytes_to_transfer; + int bytes_to_receive; + u32 genfifocs; + u32 genfifobus; + u32 dma_rx_bytes; + dma_addr_t dma_addr; + u32 genfifoentry; + enum mode_type mode; + struct completion data_completion; + struct mutex op_lock; +}; + +/** + * zynqmp_gqspi_read - For GQSPI controller read operation + * @xqspi: Pointer to the zynqmp_qspi structure + * @offset: Offset from where to read + * Return: Value at the offset + */ +static u32 zynqmp_gqspi_read(struct zynqmp_qspi *xqspi, u32 offset) +{ + return readl_relaxed(xqspi->regs + offset); +} + +/** + * zynqmp_gqspi_write - For GQSPI controller write operation + * @xqspi: Pointer to the zynqmp_qspi structure + * @offset: Offset where to write + * @val: Value to be written + */ +static inline void zynqmp_gqspi_write(struct zynqmp_qspi *xqspi, u32 offset, + u32 val) +{ + writel_relaxed(val, (xqspi->regs + offset)); +} + +/** + * zynqmp_gqspi_selectslave - For selection of slave device + * @instanceptr: Pointer to the zynqmp_qspi structure + * @slavecs: For chip select + * @slavebus: To check which bus is selected- upper or lower + */ +static void zynqmp_gqspi_selectslave(struct zynqmp_qspi *instanceptr, + u8 slavecs, u8 slavebus) +{ + /* + * Bus and CS lines selected here will be updated in the instance and + * used for subsequent GENFIFO entries during transfer. + */ + + /* Choose slave select line */ + switch (slavecs) { + case GQSPI_SELECT_FLASH_CS_BOTH: + instanceptr->genfifocs = GQSPI_GENFIFO_CS_LOWER | + GQSPI_GENFIFO_CS_UPPER; + break; + case GQSPI_SELECT_FLASH_CS_UPPER: + instanceptr->genfifocs = GQSPI_GENFIFO_CS_UPPER; + break; + case GQSPI_SELECT_FLASH_CS_LOWER: + instanceptr->genfifocs = GQSPI_GENFIFO_CS_LOWER; + break; + default: + dev_warn(instanceptr->dev, "Invalid slave select\n"); + } + + /* Choose the bus */ + switch (slavebus) { + case GQSPI_SELECT_FLASH_BUS_BOTH: + instanceptr->genfifobus = GQSPI_GENFIFO_BUS_LOWER | + GQSPI_GENFIFO_BUS_UPPER; + break; + case GQSPI_SELECT_FLASH_BUS_UPPER: + instanceptr->genfifobus = GQSPI_GENFIFO_BUS_UPPER; + break; + case GQSPI_SELECT_FLASH_BUS_LOWER: + instanceptr->genfifobus = GQSPI_GENFIFO_BUS_LOWER; + break; + default: + dev_warn(instanceptr->dev, "Invalid slave bus\n"); + } +} + +/** + * zynqmp_qspi_init_hw - Initialize the hardware + * @xqspi: Pointer to the zynqmp_qspi structure + * + * The default settings of the QSPI controller's configurable parameters on + * reset are + * - Master mode + * - TX threshold set to 1 + * - RX threshold set to 1 + * - Flash memory interface mode enabled + * This function performs the following actions + * - Disable and clear all the interrupts + * - Enable manual slave select + * - Enable manual start + * - Deselect all the chip select lines + * - Set the little endian mode of TX FIFO and + * - Enable the QSPI controller + */ +static void zynqmp_qspi_init_hw(struct zynqmp_qspi *xqspi) +{ + u32 config_reg; + + /* Select the GQSPI mode */ + zynqmp_gqspi_write(xqspi, GQSPI_SEL_OFST, GQSPI_SEL_MASK); + /* Clear and disable interrupts */ + zynqmp_gqspi_write(xqspi, GQSPI_ISR_OFST, + zynqmp_gqspi_read(xqspi, GQSPI_ISR_OFST) | + GQSPI_ISR_WR_TO_CLR_MASK); + /* Clear the DMA STS */ + zynqmp_gqspi_write(xqspi, GQSPI_QSPIDMA_DST_I_STS_OFST, + zynqmp_gqspi_read(xqspi, + GQSPI_QSPIDMA_DST_I_STS_OFST)); + zynqmp_gqspi_write(xqspi, GQSPI_QSPIDMA_DST_STS_OFST, + zynqmp_gqspi_read(xqspi, + GQSPI_QSPIDMA_DST_STS_OFST) | + GQSPI_QSPIDMA_DST_STS_WTC); + zynqmp_gqspi_write(xqspi, GQSPI_IDR_OFST, GQSPI_IDR_ALL_MASK); + zynqmp_gqspi_write(xqspi, + GQSPI_QSPIDMA_DST_I_DIS_OFST, + GQSPI_QSPIDMA_DST_INTR_ALL_MASK); + /* Disable the GQSPI */ + zynqmp_gqspi_write(xqspi, GQSPI_EN_OFST, 0x0); + config_reg = zynqmp_gqspi_read(xqspi, GQSPI_CONFIG_OFST); + config_reg &= ~GQSPI_CFG_MODE_EN_MASK; + /* Manual start */ + config_reg |= GQSPI_CFG_GEN_FIFO_START_MODE_MASK; + /* Little endian by default */ + config_reg &= ~GQSPI_CFG_ENDIAN_MASK; + /* Disable poll time out */ + config_reg &= ~GQSPI_CFG_EN_POLL_TO_MASK; + /* Set hold bit */ + config_reg |= GQSPI_CFG_WP_HOLD_MASK; + /* Clear pre-scalar by default */ + config_reg &= ~GQSPI_CFG_BAUD_RATE_DIV_MASK; + /* CPHA 0 */ + config_reg &= ~GQSPI_CFG_CLK_PHA_MASK; + /* CPOL 0 */ + config_reg &= ~GQSPI_CFG_CLK_POL_MASK; + zynqmp_gqspi_write(xqspi, GQSPI_CONFIG_OFST, config_reg); + + /* Clear the TX and RX FIFO */ + zynqmp_gqspi_write(xqspi, GQSPI_FIFO_CTRL_OFST, + GQSPI_FIFO_CTRL_RST_RX_FIFO_MASK | + GQSPI_FIFO_CTRL_RST_TX_FIFO_MASK | + GQSPI_FIFO_CTRL_RST_GEN_FIFO_MASK); + /* Set by default to allow for high frequencies */ + zynqmp_gqspi_write(xqspi, GQSPI_LPBK_DLY_ADJ_OFST, + zynqmp_gqspi_read(xqspi, GQSPI_LPBK_DLY_ADJ_OFST) | + GQSPI_LPBK_DLY_ADJ_USE_LPBK_MASK); + /* Reset thresholds */ + zynqmp_gqspi_write(xqspi, GQSPI_TX_THRESHOLD_OFST, + GQSPI_TX_FIFO_THRESHOLD_RESET_VAL); + zynqmp_gqspi_write(xqspi, GQSPI_RX_THRESHOLD_OFST, + GQSPI_RX_FIFO_THRESHOLD); + zynqmp_gqspi_write(xqspi, GQSPI_GF_THRESHOLD_OFST, + GQSPI_GEN_FIFO_THRESHOLD_RESET_VAL); + zynqmp_gqspi_selectslave(xqspi, + GQSPI_SELECT_FLASH_CS_LOWER, + GQSPI_SELECT_FLASH_BUS_LOWER); + /* Initialize DMA */ + zynqmp_gqspi_write(xqspi, + GQSPI_QSPIDMA_DST_CTRL_OFST, + GQSPI_QSPIDMA_DST_CTRL_RESET_VAL); + + /* Enable the GQSPI */ + zynqmp_gqspi_write(xqspi, GQSPI_EN_OFST, GQSPI_EN_MASK); +} + +/** + * zynqmp_qspi_copy_read_data - Copy data to RX buffer + * @xqspi: Pointer to the zynqmp_qspi structure + * @data: The variable where data is stored + * @size: Number of bytes to be copied from data to RX buffer + */ +static void zynqmp_qspi_copy_read_data(struct zynqmp_qspi *xqspi, + ulong data, u8 size) +{ + memcpy(xqspi->rxbuf, &data, size); + xqspi->rxbuf += size; + xqspi->bytes_to_receive -= size; +} + +/** + * zynqmp_qspi_chipselect - Select or deselect the chip select line + * @qspi: Pointer to the spi_device structure + * @is_high: Select(0) or deselect (1) the chip select line + */ +static void zynqmp_qspi_chipselect(struct spi_device *qspi, bool is_high) +{ + struct zynqmp_qspi *xqspi = spi_master_get_devdata(qspi->master); + ulong timeout; + u32 genfifoentry = 0, statusreg; + + genfifoentry |= GQSPI_GENFIFO_MODE_SPI; + + if (!is_high) { + xqspi->genfifobus = GQSPI_GENFIFO_BUS_LOWER; + xqspi->genfifocs = GQSPI_GENFIFO_CS_LOWER; + genfifoentry |= xqspi->genfifobus; + genfifoentry |= xqspi->genfifocs; + genfifoentry |= GQSPI_GENFIFO_CS_SETUP; + } else { + genfifoentry |= GQSPI_GENFIFO_CS_HOLD; + } + + zynqmp_gqspi_write(xqspi, GQSPI_GEN_FIFO_OFST, genfifoentry); + + /* Manually start the generic FIFO command */ + zynqmp_gqspi_write(xqspi, GQSPI_CONFIG_OFST, + zynqmp_gqspi_read(xqspi, GQSPI_CONFIG_OFST) | + GQSPI_CFG_START_GEN_FIFO_MASK); + + timeout = jiffies + msecs_to_jiffies(1000); + + /* Wait until the generic FIFO command is empty */ + do { + statusreg = zynqmp_gqspi_read(xqspi, GQSPI_ISR_OFST); + + if ((statusreg & GQSPI_ISR_GENFIFOEMPTY_MASK) && + (statusreg & GQSPI_ISR_TXEMPTY_MASK)) + break; + cpu_relax(); + } while (!time_after_eq(jiffies, timeout)); + + if (time_after_eq(jiffies, timeout)) + dev_err(xqspi->dev, "Chip select timed out\n"); +} + +/** + * zynqmp_qspi_selectspimode - Selects SPI mode - x1 or x2 or x4. + * @xqspi: xqspi is a pointer to the GQSPI instance + * @spimode: spimode - SPI or DUAL or QUAD. + * Return: Mask to set desired SPI mode in GENFIFO entry. + */ +static inline u32 zynqmp_qspi_selectspimode(struct zynqmp_qspi *xqspi, + u8 spimode) +{ + u32 mask = 0; + + switch (spimode) { + case GQSPI_SELECT_MODE_DUALSPI: + mask = GQSPI_GENFIFO_MODE_DUALSPI; + break; + case GQSPI_SELECT_MODE_QUADSPI: + mask = GQSPI_GENFIFO_MODE_QUADSPI; + break; + case GQSPI_SELECT_MODE_SPI: + mask = GQSPI_GENFIFO_MODE_SPI; + break; + default: + dev_warn(xqspi->dev, "Invalid SPI mode\n"); + } + + return mask; +} + +/** + * zynqmp_qspi_config_op - Configure QSPI controller for specified + * transfer + * @xqspi: Pointer to the zynqmp_qspi structure + * @qspi: Pointer to the spi_device structure + * + * Sets the operational mode of QSPI controller for the next QSPI transfer and + * sets the requested clock frequency. + * + * Return: Always 0 + * + * Note: + * If the requested frequency is not an exact match with what can be + * obtained using the pre-scalar value, the driver sets the clock + * frequency which is lower than the requested frequency (maximum lower) + * for the transfer. + * + * If the requested frequency is higher or lower than that is supported + * by the QSPI controller the driver will set the highest or lowest + * frequency supported by controller. + */ +static int zynqmp_qspi_config_op(struct zynqmp_qspi *xqspi, + struct spi_device *qspi) +{ + ulong clk_rate; + u32 config_reg, baud_rate_val = 0; + + /* Set the clock frequency */ + /* If req_hz == 0, default to lowest speed */ + clk_rate = clk_get_rate(xqspi->refclk); + + while ((baud_rate_val < GQSPI_BAUD_DIV_MAX) && + (clk_rate / + (GQSPI_BAUD_DIV_SHIFT << baud_rate_val)) > qspi->max_speed_hz) + baud_rate_val++; + + config_reg = zynqmp_gqspi_read(xqspi, GQSPI_CONFIG_OFST); + + /* Set the QSPI clock phase and clock polarity */ + config_reg &= (~GQSPI_CFG_CLK_PHA_MASK) & (~GQSPI_CFG_CLK_POL_MASK); + + if (qspi->mode & SPI_CPHA) + config_reg |= GQSPI_CFG_CLK_PHA_MASK; + if (qspi->mode & SPI_CPOL) + config_reg |= GQSPI_CFG_CLK_POL_MASK; + + config_reg &= ~GQSPI_CFG_BAUD_RATE_DIV_MASK; + config_reg |= (baud_rate_val << GQSPI_CFG_BAUD_RATE_DIV_SHIFT); + zynqmp_gqspi_write(xqspi, GQSPI_CONFIG_OFST, config_reg); + return 0; +} + +/** + * zynqmp_qspi_setup_op - Configure the QSPI controller + * @qspi: Pointer to the spi_device structure + * + * Sets the operational mode of QSPI controller for the next QSPI transfer, + * baud rate and divisor value to setup the requested qspi clock. + * + * Return: 0 on success; error value otherwise. + */ +static int zynqmp_qspi_setup_op(struct spi_device *qspi) +{ + struct spi_controller *ctlr = qspi->master; + struct zynqmp_qspi *xqspi = spi_controller_get_devdata(ctlr); + + if (ctlr->busy) + return -EBUSY; + + zynqmp_gqspi_write(xqspi, GQSPI_EN_OFST, GQSPI_EN_MASK); + + return 0; +} + +/** + * zynqmp_qspi_filltxfifo - Fills the TX FIFO as long as there is room in + * the FIFO or the bytes required to be + * transmitted. + * @xqspi: Pointer to the zynqmp_qspi structure + * @size: Number of bytes to be copied from TX buffer to TX FIFO + */ +static void zynqmp_qspi_filltxfifo(struct zynqmp_qspi *xqspi, int size) +{ + u32 count = 0, intermediate; + + while ((xqspi->bytes_to_transfer > 0) && (count < size) && (xqspi->txbuf)) { + memcpy(&intermediate, xqspi->txbuf, 4); + zynqmp_gqspi_write(xqspi, GQSPI_TXD_OFST, intermediate); + + if (xqspi->bytes_to_transfer >= 4) { + xqspi->txbuf += 4; + xqspi->bytes_to_transfer -= 4; + } else { + xqspi->txbuf += xqspi->bytes_to_transfer; + xqspi->bytes_to_transfer = 0; + } + count++; + } +} + +/** + * zynqmp_qspi_readrxfifo - Fills the RX FIFO as long as there is room in + * the FIFO. + * @xqspi: Pointer to the zynqmp_qspi structure + * @size: Number of bytes to be copied from RX buffer to RX FIFO + */ +static void zynqmp_qspi_readrxfifo(struct zynqmp_qspi *xqspi, u32 size) +{ + ulong data; + int count = 0; + + while ((count < size) && (xqspi->bytes_to_receive > 0)) { + if (xqspi->bytes_to_receive >= 4) { + (*(u32 *)xqspi->rxbuf) = + zynqmp_gqspi_read(xqspi, GQSPI_RXD_OFST); + xqspi->rxbuf += 4; + xqspi->bytes_to_receive -= 4; + count += 4; + } else { + data = zynqmp_gqspi_read(xqspi, GQSPI_RXD_OFST); + count += xqspi->bytes_to_receive; + zynqmp_qspi_copy_read_data(xqspi, data, + xqspi->bytes_to_receive); + xqspi->bytes_to_receive = 0; + } + } +} + +/** + * zynqmp_qspi_fillgenfifo - Fills the GENFIFO. + * @xqspi: Pointer to the zynqmp_qspi structure + * @nbits: Transfer/Receive buswidth. + * @genfifoentry: Variable in which GENFIFO mask is saved + */ +static void zynqmp_qspi_fillgenfifo(struct zynqmp_qspi *xqspi, u8 nbits, + u32 genfifoentry) +{ + u32 transfer_len = 0; + + if (xqspi->txbuf) { + genfifoentry &= ~GQSPI_GENFIFO_RX; + genfifoentry |= GQSPI_GENFIFO_DATA_XFER; + genfifoentry |= GQSPI_GENFIFO_TX; + transfer_len = xqspi->bytes_to_transfer; + } else if (xqspi->rxbuf) { + genfifoentry &= ~GQSPI_GENFIFO_TX; + genfifoentry |= GQSPI_GENFIFO_DATA_XFER; + genfifoentry |= GQSPI_GENFIFO_RX; + if (xqspi->mode == GQSPI_MODE_DMA) + transfer_len = xqspi->dma_rx_bytes; + else + transfer_len = xqspi->bytes_to_receive; + } else { + /* Sending dummy circles here */ + genfifoentry &= ~(GQSPI_GENFIFO_TX | GQSPI_GENFIFO_RX); + genfifoentry |= GQSPI_GENFIFO_DATA_XFER; + transfer_len = xqspi->bytes_to_transfer; + } + genfifoentry |= zynqmp_qspi_selectspimode(xqspi, nbits); + xqspi->genfifoentry = genfifoentry; + + if ((transfer_len) < GQSPI_GENFIFO_IMM_DATA_MASK) { + genfifoentry &= ~GQSPI_GENFIFO_IMM_DATA_MASK; + genfifoentry |= transfer_len; + zynqmp_gqspi_write(xqspi, GQSPI_GEN_FIFO_OFST, genfifoentry); + } else { + int tempcount = transfer_len; + u32 exponent = 8; /* 2^8 = 256 */ + u8 imm_data = tempcount & 0xFF; + + tempcount &= ~(tempcount & 0xFF); + /* Immediate entry */ + if (tempcount != 0) { + /* Exponent entries */ + genfifoentry |= GQSPI_GENFIFO_EXP; + while (tempcount != 0) { + if (tempcount & GQSPI_GENFIFO_EXP_START) { + genfifoentry &= + ~GQSPI_GENFIFO_IMM_DATA_MASK; + genfifoentry |= exponent; + zynqmp_gqspi_write(xqspi, + GQSPI_GEN_FIFO_OFST, + genfifoentry); + } + tempcount = tempcount >> 1; + exponent++; + } + } + if (imm_data != 0) { + genfifoentry &= ~GQSPI_GENFIFO_EXP; + genfifoentry &= ~GQSPI_GENFIFO_IMM_DATA_MASK; + genfifoentry |= (u8)(imm_data & 0xFF); + zynqmp_gqspi_write(xqspi, GQSPI_GEN_FIFO_OFST, + genfifoentry); + } + } + if (xqspi->mode == GQSPI_MODE_IO && xqspi->rxbuf) { + /* Dummy generic FIFO entry */ + zynqmp_gqspi_write(xqspi, GQSPI_GEN_FIFO_OFST, 0x0); + } +} + +/** + * zynqmp_process_dma_irq - Handler for DMA done interrupt of QSPI + * controller + * @xqspi: zynqmp_qspi instance pointer + * + * This function handles DMA interrupt only. + */ +static void zynqmp_process_dma_irq(struct zynqmp_qspi *xqspi) +{ + u32 config_reg, genfifoentry; + + dma_unmap_single(xqspi->dev, xqspi->dma_addr, + xqspi->dma_rx_bytes, DMA_FROM_DEVICE); + xqspi->rxbuf += xqspi->dma_rx_bytes; + xqspi->bytes_to_receive -= xqspi->dma_rx_bytes; + xqspi->dma_rx_bytes = 0; + + /* Disabling the DMA interrupts */ + zynqmp_gqspi_write(xqspi, GQSPI_QSPIDMA_DST_I_DIS_OFST, + GQSPI_QSPIDMA_DST_I_EN_DONE_MASK); + + if (xqspi->bytes_to_receive > 0) { + /* Switch to IO mode,for remaining bytes to receive */ + config_reg = zynqmp_gqspi_read(xqspi, GQSPI_CONFIG_OFST); + config_reg &= ~GQSPI_CFG_MODE_EN_MASK; + zynqmp_gqspi_write(xqspi, GQSPI_CONFIG_OFST, config_reg); + + /* Initiate the transfer of remaining bytes */ + genfifoentry = xqspi->genfifoentry; + genfifoentry |= xqspi->bytes_to_receive; + zynqmp_gqspi_write(xqspi, GQSPI_GEN_FIFO_OFST, genfifoentry); + + /* Dummy generic FIFO entry */ + zynqmp_gqspi_write(xqspi, GQSPI_GEN_FIFO_OFST, 0x0); + + /* Manual start */ + zynqmp_gqspi_write(xqspi, GQSPI_CONFIG_OFST, + (zynqmp_gqspi_read(xqspi, + GQSPI_CONFIG_OFST) | + GQSPI_CFG_START_GEN_FIFO_MASK)); + + /* Enable the RX interrupts for IO mode */ + zynqmp_gqspi_write(xqspi, GQSPI_IER_OFST, + GQSPI_IER_GENFIFOEMPTY_MASK | + GQSPI_IER_RXNEMPTY_MASK | + GQSPI_IER_RXEMPTY_MASK); + } +} + +/** + * zynqmp_qspi_irq - Interrupt service routine of the QSPI controller + * @irq: IRQ number + * @dev_id: Pointer to the xqspi structure + * + * This function handles TX empty only. + * On TX empty interrupt this function reads the received data from RX FIFO + * and fills the TX FIFO if there is any data remaining to be transferred. + * + * Return: IRQ_HANDLED when interrupt is handled + * IRQ_NONE otherwise. + */ +static irqreturn_t zynqmp_qspi_irq(int irq, void *dev_id) +{ + struct zynqmp_qspi *xqspi = (struct zynqmp_qspi *)dev_id; + irqreturn_t ret = IRQ_NONE; + u32 status, mask, dma_status = 0; + + status = zynqmp_gqspi_read(xqspi, GQSPI_ISR_OFST); + zynqmp_gqspi_write(xqspi, GQSPI_ISR_OFST, status); + mask = (status & ~(zynqmp_gqspi_read(xqspi, GQSPI_IMASK_OFST))); + + /* Read and clear DMA status */ + if (xqspi->mode == GQSPI_MODE_DMA) { + dma_status = + zynqmp_gqspi_read(xqspi, GQSPI_QSPIDMA_DST_I_STS_OFST); + zynqmp_gqspi_write(xqspi, GQSPI_QSPIDMA_DST_I_STS_OFST, + dma_status); + } + + if (mask & GQSPI_ISR_TXNOT_FULL_MASK) { + zynqmp_qspi_filltxfifo(xqspi, GQSPI_TX_FIFO_FILL); + ret = IRQ_HANDLED; + } + + if (dma_status & GQSPI_QSPIDMA_DST_I_STS_DONE_MASK) { + zynqmp_process_dma_irq(xqspi); + ret = IRQ_HANDLED; + } else if (!(mask & GQSPI_IER_RXEMPTY_MASK) && + (mask & GQSPI_IER_GENFIFOEMPTY_MASK)) { + zynqmp_qspi_readrxfifo(xqspi, GQSPI_RX_FIFO_FILL); + ret = IRQ_HANDLED; + } + + if (xqspi->bytes_to_receive == 0 && xqspi->bytes_to_transfer == 0 && + ((status & GQSPI_IRQ_MASK) == GQSPI_IRQ_MASK)) { + zynqmp_gqspi_write(xqspi, GQSPI_IDR_OFST, GQSPI_ISR_IDR_MASK); + complete(&xqspi->data_completion); + ret = IRQ_HANDLED; + } + return ret; +} + +/** + * zynqmp_qspi_setuprxdma - This function sets up the RX DMA operation + * @xqspi: xqspi is a pointer to the GQSPI instance. + */ +static int zynqmp_qspi_setuprxdma(struct zynqmp_qspi *xqspi) +{ + u32 rx_bytes, rx_rem, config_reg; + dma_addr_t addr; + u64 dma_align = (u64)(uintptr_t)xqspi->rxbuf; + + if (xqspi->bytes_to_receive < 8 || + ((dma_align & GQSPI_DMA_UNALIGN) != 0x0)) { + /* Setting to IO mode */ + config_reg = zynqmp_gqspi_read(xqspi, GQSPI_CONFIG_OFST); + config_reg &= ~GQSPI_CFG_MODE_EN_MASK; + zynqmp_gqspi_write(xqspi, GQSPI_CONFIG_OFST, config_reg); + xqspi->mode = GQSPI_MODE_IO; + xqspi->dma_rx_bytes = 0; + return 0; + } + + rx_rem = xqspi->bytes_to_receive % 4; + rx_bytes = (xqspi->bytes_to_receive - rx_rem); + + addr = dma_map_single(xqspi->dev, (void *)xqspi->rxbuf, + rx_bytes, DMA_FROM_DEVICE); + if (dma_mapping_error(xqspi->dev, addr)) { + dev_err(xqspi->dev, "ERR:rxdma:memory not mapped\n"); + return -ENOMEM; + } + + xqspi->dma_rx_bytes = rx_bytes; + xqspi->dma_addr = addr; + zynqmp_gqspi_write(xqspi, GQSPI_QSPIDMA_DST_ADDR_OFST, + (u32)(addr & 0xffffffff)); + addr = ((addr >> 16) >> 16); + zynqmp_gqspi_write(xqspi, GQSPI_QSPIDMA_DST_ADDR_MSB_OFST, + ((u32)addr) & 0xfff); + + /* Enabling the DMA mode */ + config_reg = zynqmp_gqspi_read(xqspi, GQSPI_CONFIG_OFST); + config_reg &= ~GQSPI_CFG_MODE_EN_MASK; + config_reg |= GQSPI_CFG_MODE_EN_DMA_MASK; + zynqmp_gqspi_write(xqspi, GQSPI_CONFIG_OFST, config_reg); + + /* Switch to DMA mode */ + xqspi->mode = GQSPI_MODE_DMA; + + /* Write the number of bytes to transfer */ + zynqmp_gqspi_write(xqspi, GQSPI_QSPIDMA_DST_SIZE_OFST, rx_bytes); + + return 0; +} + +/** + * zynqmp_qspi_write_op - This function sets up the GENFIFO entries, + * TX FIFO, and fills the TX FIFO with as many + * bytes as possible. + * @xqspi: Pointer to the GQSPI instance. + * @tx_nbits: Transfer buswidth. + * @genfifoentry: Variable in which GENFIFO mask is returned + * to calling function + */ +static void zynqmp_qspi_write_op(struct zynqmp_qspi *xqspi, u8 tx_nbits, + u32 genfifoentry) +{ + u32 config_reg; + + zynqmp_qspi_fillgenfifo(xqspi, tx_nbits, genfifoentry); + zynqmp_qspi_filltxfifo(xqspi, GQSPI_TXD_DEPTH); + if (xqspi->mode == GQSPI_MODE_DMA) { + config_reg = zynqmp_gqspi_read(xqspi, + GQSPI_CONFIG_OFST); + config_reg &= ~GQSPI_CFG_MODE_EN_MASK; + zynqmp_gqspi_write(xqspi, GQSPI_CONFIG_OFST, + config_reg); + xqspi->mode = GQSPI_MODE_IO; + } +} + +/** + * zynqmp_qspi_read_op - This function sets up the GENFIFO entries and + * RX DMA operation. + * @xqspi: xqspi is a pointer to the GQSPI instance. + * @rx_nbits: Receive buswidth. + * @genfifoentry: genfifoentry is pointer to the variable in which + * GENFIFO mask is returned to calling function + */ +static int zynqmp_qspi_read_op(struct zynqmp_qspi *xqspi, u8 rx_nbits, + u32 genfifoentry) +{ + int ret; + + ret = zynqmp_qspi_setuprxdma(xqspi); + if (ret) + return ret; + zynqmp_qspi_fillgenfifo(xqspi, rx_nbits, genfifoentry); + + return 0; +} + +/** + * zynqmp_qspi_suspend - Suspend method for the QSPI driver + * @dev: Address of the platform_device structure + * + * This function stops the QSPI driver queue and disables the QSPI controller + * + * Return: Always 0 + */ +static int __maybe_unused zynqmp_qspi_suspend(struct device *dev) +{ + struct zynqmp_qspi *xqspi = dev_get_drvdata(dev); + struct spi_controller *ctlr = xqspi->ctlr; + int ret; + + ret = spi_controller_suspend(ctlr); + if (ret) + return ret; + + zynqmp_gqspi_write(xqspi, GQSPI_EN_OFST, 0x0); + + return 0; +} + +/** + * zynqmp_qspi_resume - Resume method for the QSPI driver + * @dev: Address of the platform_device structure + * + * The function starts the QSPI driver queue and initializes the QSPI + * controller + * + * Return: 0 on success; error value otherwise + */ +static int __maybe_unused zynqmp_qspi_resume(struct device *dev) +{ + struct zynqmp_qspi *xqspi = dev_get_drvdata(dev); + struct spi_controller *ctlr = xqspi->ctlr; + + zynqmp_gqspi_write(xqspi, GQSPI_EN_OFST, GQSPI_EN_MASK); + + spi_controller_resume(ctlr); + + return 0; +} + +/** + * zynqmp_runtime_suspend - Runtime suspend method for the SPI driver + * @dev: Address of the platform_device structure + * + * This function disables the clocks + * + * Return: Always 0 + */ +static int __maybe_unused zynqmp_runtime_suspend(struct device *dev) +{ + struct zynqmp_qspi *xqspi = dev_get_drvdata(dev); + + clk_disable_unprepare(xqspi->refclk); + clk_disable_unprepare(xqspi->pclk); + + return 0; +} + +/** + * zynqmp_runtime_resume - Runtime resume method for the SPI driver + * @dev: Address of the platform_device structure + * + * This function enables the clocks + * + * Return: 0 on success and error value on error + */ +static int __maybe_unused zynqmp_runtime_resume(struct device *dev) +{ + struct zynqmp_qspi *xqspi = dev_get_drvdata(dev); + int ret; + + ret = clk_prepare_enable(xqspi->pclk); + if (ret) { + dev_err(dev, "Cannot enable APB clock.\n"); + return ret; + } + + ret = clk_prepare_enable(xqspi->refclk); + if (ret) { + dev_err(dev, "Cannot enable device clock.\n"); + clk_disable_unprepare(xqspi->pclk); + return ret; + } + + return 0; +} + +/** + * zynqmp_qspi_exec_op() - Initiates the QSPI transfer + * @mem: The SPI memory + * @op: The memory operation to execute + * + * Executes a memory operation. + * + * This function first selects the chip and starts the memory operation. + * + * Return: 0 in case of success, a negative error code otherwise. + */ +static int zynqmp_qspi_exec_op(struct spi_mem *mem, + const struct spi_mem_op *op) +{ + struct zynqmp_qspi *xqspi = spi_controller_get_devdata + (mem->spi->master); + int err = 0, i; + u32 genfifoentry = 0; + u16 opcode = op->cmd.opcode; + u64 opaddr; + + dev_dbg(xqspi->dev, "cmd:%#x mode:%d.%d.%d.%d\n", + op->cmd.opcode, op->cmd.buswidth, op->addr.buswidth, + op->dummy.buswidth, op->data.buswidth); + + mutex_lock(&xqspi->op_lock); + zynqmp_qspi_config_op(xqspi, mem->spi); + zynqmp_qspi_chipselect(mem->spi, false); + genfifoentry |= xqspi->genfifocs; + genfifoentry |= xqspi->genfifobus; + + if (op->cmd.opcode) { + reinit_completion(&xqspi->data_completion); + xqspi->txbuf = &opcode; + xqspi->rxbuf = NULL; + xqspi->bytes_to_transfer = op->cmd.nbytes; + xqspi->bytes_to_receive = 0; + zynqmp_qspi_write_op(xqspi, op->cmd.buswidth, genfifoentry); + zynqmp_gqspi_write(xqspi, GQSPI_CONFIG_OFST, + zynqmp_gqspi_read(xqspi, GQSPI_CONFIG_OFST) | + GQSPI_CFG_START_GEN_FIFO_MASK); + zynqmp_gqspi_write(xqspi, GQSPI_IER_OFST, + GQSPI_IER_GENFIFOEMPTY_MASK | + GQSPI_IER_TXNOT_FULL_MASK); + if (!wait_for_completion_timeout + (&xqspi->data_completion, msecs_to_jiffies(1000))) { + err = -ETIMEDOUT; + goto return_err; + } + } + + if (op->addr.nbytes) { + xqspi->txbuf = &opaddr; + for (i = 0; i < op->addr.nbytes; i++) { + *(((u8 *)xqspi->txbuf) + i) = op->addr.val >> + (8 * (op->addr.nbytes - i - 1)); + } + + reinit_completion(&xqspi->data_completion); + xqspi->rxbuf = NULL; + xqspi->bytes_to_transfer = op->addr.nbytes; + xqspi->bytes_to_receive = 0; + zynqmp_qspi_write_op(xqspi, op->addr.buswidth, genfifoentry); + zynqmp_gqspi_write(xqspi, GQSPI_CONFIG_OFST, + zynqmp_gqspi_read(xqspi, + GQSPI_CONFIG_OFST) | + GQSPI_CFG_START_GEN_FIFO_MASK); + zynqmp_gqspi_write(xqspi, GQSPI_IER_OFST, + GQSPI_IER_TXEMPTY_MASK | + GQSPI_IER_GENFIFOEMPTY_MASK | + GQSPI_IER_TXNOT_FULL_MASK); + if (!wait_for_completion_timeout + (&xqspi->data_completion, msecs_to_jiffies(1000))) { + err = -ETIMEDOUT; + goto return_err; + } + } + + if (op->dummy.nbytes) { + xqspi->txbuf = NULL; + xqspi->rxbuf = NULL; + /* + * xqspi->bytes_to_transfer here represents the dummy circles + * which need to be sent. + */ + xqspi->bytes_to_transfer = op->dummy.nbytes * 8 / op->dummy.buswidth; + xqspi->bytes_to_receive = 0; + /* + * Using op->data.buswidth instead of op->dummy.buswidth here because + * we need to use it to configure the correct SPI mode. + */ + zynqmp_qspi_write_op(xqspi, op->data.buswidth, + genfifoentry); + zynqmp_gqspi_write(xqspi, GQSPI_CONFIG_OFST, + zynqmp_gqspi_read(xqspi, GQSPI_CONFIG_OFST) | + GQSPI_CFG_START_GEN_FIFO_MASK); + } + + if (op->data.nbytes) { + reinit_completion(&xqspi->data_completion); + if (op->data.dir == SPI_MEM_DATA_OUT) { + xqspi->txbuf = (u8 *)op->data.buf.out; + xqspi->rxbuf = NULL; + xqspi->bytes_to_transfer = op->data.nbytes; + xqspi->bytes_to_receive = 0; + zynqmp_qspi_write_op(xqspi, op->data.buswidth, + genfifoentry); + zynqmp_gqspi_write(xqspi, GQSPI_CONFIG_OFST, + zynqmp_gqspi_read + (xqspi, GQSPI_CONFIG_OFST) | + GQSPI_CFG_START_GEN_FIFO_MASK); + zynqmp_gqspi_write(xqspi, GQSPI_IER_OFST, + GQSPI_IER_TXEMPTY_MASK | + GQSPI_IER_GENFIFOEMPTY_MASK | + GQSPI_IER_TXNOT_FULL_MASK); + } else { + xqspi->txbuf = NULL; + xqspi->rxbuf = (u8 *)op->data.buf.in; + xqspi->bytes_to_receive = op->data.nbytes; + xqspi->bytes_to_transfer = 0; + err = zynqmp_qspi_read_op(xqspi, op->data.buswidth, + genfifoentry); + if (err) + goto return_err; + + zynqmp_gqspi_write(xqspi, GQSPI_CONFIG_OFST, + zynqmp_gqspi_read + (xqspi, GQSPI_CONFIG_OFST) | + GQSPI_CFG_START_GEN_FIFO_MASK); + if (xqspi->mode == GQSPI_MODE_DMA) { + zynqmp_gqspi_write + (xqspi, GQSPI_QSPIDMA_DST_I_EN_OFST, + GQSPI_QSPIDMA_DST_I_EN_DONE_MASK); + } else { + zynqmp_gqspi_write(xqspi, GQSPI_IER_OFST, + GQSPI_IER_GENFIFOEMPTY_MASK | + GQSPI_IER_RXNEMPTY_MASK | + GQSPI_IER_RXEMPTY_MASK); + } + } + if (!wait_for_completion_timeout + (&xqspi->data_completion, msecs_to_jiffies(1000))) + err = -ETIMEDOUT; + } + +return_err: + + zynqmp_qspi_chipselect(mem->spi, true); + mutex_unlock(&xqspi->op_lock); + + return err; +} + +static const struct dev_pm_ops zynqmp_qspi_dev_pm_ops = { + SET_RUNTIME_PM_OPS(zynqmp_runtime_suspend, + zynqmp_runtime_resume, NULL) + SET_SYSTEM_SLEEP_PM_OPS(zynqmp_qspi_suspend, zynqmp_qspi_resume) +}; + +static const struct spi_controller_mem_ops zynqmp_qspi_mem_ops = { + .exec_op = zynqmp_qspi_exec_op, +}; + +/** + * zynqmp_qspi_probe - Probe method for the QSPI driver + * @pdev: Pointer to the platform_device structure + * + * This function initializes the driver data structures and the hardware. + * + * Return: 0 on success; error value otherwise + */ +static int zynqmp_qspi_probe(struct platform_device *pdev) +{ + int ret = 0; + struct spi_controller *ctlr; + struct zynqmp_qspi *xqspi; + struct device *dev = &pdev->dev; + struct device_node *np = dev->of_node; + + ctlr = spi_alloc_master(&pdev->dev, sizeof(*xqspi)); + if (!ctlr) + return -ENOMEM; + + xqspi = spi_controller_get_devdata(ctlr); + xqspi->dev = dev; + xqspi->ctlr = ctlr; + platform_set_drvdata(pdev, xqspi); + + xqspi->regs = devm_platform_ioremap_resource(pdev, 0); + if (IS_ERR(xqspi->regs)) { + ret = PTR_ERR(xqspi->regs); + goto remove_master; + } + + xqspi->pclk = devm_clk_get(&pdev->dev, "pclk"); + if (IS_ERR(xqspi->pclk)) { + dev_err(dev, "pclk clock not found.\n"); + ret = PTR_ERR(xqspi->pclk); + goto remove_master; + } + + xqspi->refclk = devm_clk_get(&pdev->dev, "ref_clk"); + if (IS_ERR(xqspi->refclk)) { + dev_err(dev, "ref_clk clock not found.\n"); + ret = PTR_ERR(xqspi->refclk); + goto remove_master; + } + + ret = clk_prepare_enable(xqspi->pclk); + if (ret) { + dev_err(dev, "Unable to enable APB clock.\n"); + goto remove_master; + } + + ret = clk_prepare_enable(xqspi->refclk); + if (ret) { + dev_err(dev, "Unable to enable device clock.\n"); + goto clk_dis_pclk; + } + + init_completion(&xqspi->data_completion); + + mutex_init(&xqspi->op_lock); + + pm_runtime_use_autosuspend(&pdev->dev); + pm_runtime_set_autosuspend_delay(&pdev->dev, SPI_AUTOSUSPEND_TIMEOUT); + pm_runtime_set_active(&pdev->dev); + pm_runtime_enable(&pdev->dev); + /* QSPI controller initializations */ + zynqmp_qspi_init_hw(xqspi); + + pm_runtime_mark_last_busy(&pdev->dev); + pm_runtime_put_autosuspend(&pdev->dev); + xqspi->irq = platform_get_irq(pdev, 0); + if (xqspi->irq <= 0) { + ret = -ENXIO; + goto clk_dis_all; + } + ret = devm_request_irq(&pdev->dev, xqspi->irq, zynqmp_qspi_irq, + 0, pdev->name, xqspi); + if (ret != 0) { + ret = -ENXIO; + dev_err(dev, "request_irq failed\n"); + goto clk_dis_all; + } + + ret = dma_set_mask(&pdev->dev, DMA_BIT_MASK(44)); + if (ret) + goto clk_dis_all; + + ctlr->bits_per_word_mask = SPI_BPW_MASK(8); + ctlr->num_chipselect = GQSPI_DEFAULT_NUM_CS; + ctlr->mem_ops = &zynqmp_qspi_mem_ops; + ctlr->setup = zynqmp_qspi_setup_op; + ctlr->max_speed_hz = clk_get_rate(xqspi->refclk) / 2; + ctlr->bits_per_word_mask = SPI_BPW_MASK(8); + ctlr->mode_bits = SPI_CPOL | SPI_CPHA | SPI_RX_DUAL | SPI_RX_QUAD | + SPI_TX_DUAL | SPI_TX_QUAD; + ctlr->dev.of_node = np; + + ret = devm_spi_register_controller(&pdev->dev, ctlr); + if (ret) { + dev_err(&pdev->dev, "spi_register_controller failed\n"); + goto clk_dis_all; + } + + return 0; + +clk_dis_all: + pm_runtime_set_suspended(&pdev->dev); + pm_runtime_disable(&pdev->dev); + clk_disable_unprepare(xqspi->refclk); +clk_dis_pclk: + clk_disable_unprepare(xqspi->pclk); +remove_master: + spi_controller_put(ctlr); + + return ret; +} + +/** + * zynqmp_qspi_remove - Remove method for the QSPI driver + * @pdev: Pointer to the platform_device structure + * + * This function is called if a device is physically removed from the system or + * if the driver module is being unloaded. It frees all resources allocated to + * the device. + * + * Return: 0 Always + */ +static int zynqmp_qspi_remove(struct platform_device *pdev) +{ + struct zynqmp_qspi *xqspi = platform_get_drvdata(pdev); + + zynqmp_gqspi_write(xqspi, GQSPI_EN_OFST, 0x0); + clk_disable_unprepare(xqspi->refclk); + clk_disable_unprepare(xqspi->pclk); + pm_runtime_set_suspended(&pdev->dev); + pm_runtime_disable(&pdev->dev); + + return 0; +} + +static const struct of_device_id zynqmp_qspi_of_match[] = { + { .compatible = "xlnx,zynqmp-qspi-1.0", }, + { /* End of table */ } +}; + +MODULE_DEVICE_TABLE(of, zynqmp_qspi_of_match); + +static struct platform_driver zynqmp_qspi_driver = { + .probe = zynqmp_qspi_probe, + .remove = zynqmp_qspi_remove, + .driver = { + .name = "zynqmp-qspi", + .of_match_table = zynqmp_qspi_of_match, + .pm = &zynqmp_qspi_dev_pm_ops, + }, +}; + +module_platform_driver(zynqmp_qspi_driver); + +MODULE_AUTHOR("Xilinx, Inc."); +MODULE_DESCRIPTION("Xilinx Zynqmp QSPI driver"); +MODULE_LICENSE("GPL"); diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c new file mode 100644 index 000000000..857a13998 --- /dev/null +++ b/drivers/spi/spi.c @@ -0,0 +1,4252 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +// SPI init/core code +// +// Copyright (C) 2005 David Brownell +// Copyright (C) 2008 Secret Lab Technologies Ltd. + +#include <linux/kernel.h> +#include <linux/device.h> +#include <linux/init.h> +#include <linux/cache.h> +#include <linux/dma-mapping.h> +#include <linux/dmaengine.h> +#include <linux/mutex.h> +#include <linux/of_device.h> +#include <linux/of_irq.h> +#include <linux/clk/clk-conf.h> +#include <linux/slab.h> +#include <linux/mod_devicetable.h> +#include <linux/spi/spi.h> +#include <linux/spi/spi-mem.h> +#include <linux/of_gpio.h> +#include <linux/gpio/consumer.h> +#include <linux/pm_runtime.h> +#include <linux/pm_domain.h> +#include <linux/property.h> +#include <linux/export.h> +#include <linux/sched/rt.h> +#include <uapi/linux/sched/types.h> +#include <linux/delay.h> +#include <linux/kthread.h> +#include <linux/ioport.h> +#include <linux/acpi.h> +#include <linux/highmem.h> +#include <linux/idr.h> +#include <linux/platform_data/x86/apple.h> + +#define CREATE_TRACE_POINTS +#include <trace/events/spi.h> +EXPORT_TRACEPOINT_SYMBOL(spi_transfer_start); +EXPORT_TRACEPOINT_SYMBOL(spi_transfer_stop); + +#include "internals.h" + +static DEFINE_IDR(spi_master_idr); + +static void spidev_release(struct device *dev) +{ + struct spi_device *spi = to_spi_device(dev); + + spi_controller_put(spi->controller); + kfree(spi->driver_override); + kfree(spi); +} + +static ssize_t +modalias_show(struct device *dev, struct device_attribute *a, char *buf) +{ + const struct spi_device *spi = to_spi_device(dev); + int len; + + len = acpi_device_modalias(dev, buf, PAGE_SIZE - 1); + if (len != -ENODEV) + return len; + + return sprintf(buf, "%s%s\n", SPI_MODULE_PREFIX, spi->modalias); +} +static DEVICE_ATTR_RO(modalias); + +static ssize_t driver_override_store(struct device *dev, + struct device_attribute *a, + const char *buf, size_t count) +{ + struct spi_device *spi = to_spi_device(dev); + const char *end = memchr(buf, '\n', count); + const size_t len = end ? end - buf : count; + const char *driver_override, *old; + + /* We need to keep extra room for a newline when displaying value */ + if (len >= (PAGE_SIZE - 1)) + return -EINVAL; + + driver_override = kstrndup(buf, len, GFP_KERNEL); + if (!driver_override) + return -ENOMEM; + + device_lock(dev); + old = spi->driver_override; + if (len) { + spi->driver_override = driver_override; + } else { + /* Empty string, disable driver override */ + spi->driver_override = NULL; + kfree(driver_override); + } + device_unlock(dev); + kfree(old); + + return count; +} + +static ssize_t driver_override_show(struct device *dev, + struct device_attribute *a, char *buf) +{ + const struct spi_device *spi = to_spi_device(dev); + ssize_t len; + + device_lock(dev); + len = snprintf(buf, PAGE_SIZE, "%s\n", spi->driver_override ? : ""); + device_unlock(dev); + return len; +} +static DEVICE_ATTR_RW(driver_override); + +#define SPI_STATISTICS_ATTRS(field, file) \ +static ssize_t spi_controller_##field##_show(struct device *dev, \ + struct device_attribute *attr, \ + char *buf) \ +{ \ + struct spi_controller *ctlr = container_of(dev, \ + struct spi_controller, dev); \ + return spi_statistics_##field##_show(&ctlr->statistics, buf); \ +} \ +static struct device_attribute dev_attr_spi_controller_##field = { \ + .attr = { .name = file, .mode = 0444 }, \ + .show = spi_controller_##field##_show, \ +}; \ +static ssize_t spi_device_##field##_show(struct device *dev, \ + struct device_attribute *attr, \ + char *buf) \ +{ \ + struct spi_device *spi = to_spi_device(dev); \ + return spi_statistics_##field##_show(&spi->statistics, buf); \ +} \ +static struct device_attribute dev_attr_spi_device_##field = { \ + .attr = { .name = file, .mode = 0444 }, \ + .show = spi_device_##field##_show, \ +} + +#define SPI_STATISTICS_SHOW_NAME(name, file, field, format_string) \ +static ssize_t spi_statistics_##name##_show(struct spi_statistics *stat, \ + char *buf) \ +{ \ + unsigned long flags; \ + ssize_t len; \ + spin_lock_irqsave(&stat->lock, flags); \ + len = sprintf(buf, format_string, stat->field); \ + spin_unlock_irqrestore(&stat->lock, flags); \ + return len; \ +} \ +SPI_STATISTICS_ATTRS(name, file) + +#define SPI_STATISTICS_SHOW(field, format_string) \ + SPI_STATISTICS_SHOW_NAME(field, __stringify(field), \ + field, format_string) + +SPI_STATISTICS_SHOW(messages, "%lu"); +SPI_STATISTICS_SHOW(transfers, "%lu"); +SPI_STATISTICS_SHOW(errors, "%lu"); +SPI_STATISTICS_SHOW(timedout, "%lu"); + +SPI_STATISTICS_SHOW(spi_sync, "%lu"); +SPI_STATISTICS_SHOW(spi_sync_immediate, "%lu"); +SPI_STATISTICS_SHOW(spi_async, "%lu"); + +SPI_STATISTICS_SHOW(bytes, "%llu"); +SPI_STATISTICS_SHOW(bytes_rx, "%llu"); +SPI_STATISTICS_SHOW(bytes_tx, "%llu"); + +#define SPI_STATISTICS_TRANSFER_BYTES_HISTO(index, number) \ + SPI_STATISTICS_SHOW_NAME(transfer_bytes_histo##index, \ + "transfer_bytes_histo_" number, \ + transfer_bytes_histo[index], "%lu") +SPI_STATISTICS_TRANSFER_BYTES_HISTO(0, "0-1"); +SPI_STATISTICS_TRANSFER_BYTES_HISTO(1, "2-3"); +SPI_STATISTICS_TRANSFER_BYTES_HISTO(2, "4-7"); +SPI_STATISTICS_TRANSFER_BYTES_HISTO(3, "8-15"); +SPI_STATISTICS_TRANSFER_BYTES_HISTO(4, "16-31"); +SPI_STATISTICS_TRANSFER_BYTES_HISTO(5, "32-63"); +SPI_STATISTICS_TRANSFER_BYTES_HISTO(6, "64-127"); +SPI_STATISTICS_TRANSFER_BYTES_HISTO(7, "128-255"); +SPI_STATISTICS_TRANSFER_BYTES_HISTO(8, "256-511"); +SPI_STATISTICS_TRANSFER_BYTES_HISTO(9, "512-1023"); +SPI_STATISTICS_TRANSFER_BYTES_HISTO(10, "1024-2047"); +SPI_STATISTICS_TRANSFER_BYTES_HISTO(11, "2048-4095"); +SPI_STATISTICS_TRANSFER_BYTES_HISTO(12, "4096-8191"); +SPI_STATISTICS_TRANSFER_BYTES_HISTO(13, "8192-16383"); +SPI_STATISTICS_TRANSFER_BYTES_HISTO(14, "16384-32767"); +SPI_STATISTICS_TRANSFER_BYTES_HISTO(15, "32768-65535"); +SPI_STATISTICS_TRANSFER_BYTES_HISTO(16, "65536+"); + +SPI_STATISTICS_SHOW(transfers_split_maxsize, "%lu"); + +static struct attribute *spi_dev_attrs[] = { + &dev_attr_modalias.attr, + &dev_attr_driver_override.attr, + NULL, +}; + +static const struct attribute_group spi_dev_group = { + .attrs = spi_dev_attrs, +}; + +static struct attribute *spi_device_statistics_attrs[] = { + &dev_attr_spi_device_messages.attr, + &dev_attr_spi_device_transfers.attr, + &dev_attr_spi_device_errors.attr, + &dev_attr_spi_device_timedout.attr, + &dev_attr_spi_device_spi_sync.attr, + &dev_attr_spi_device_spi_sync_immediate.attr, + &dev_attr_spi_device_spi_async.attr, + &dev_attr_spi_device_bytes.attr, + &dev_attr_spi_device_bytes_rx.attr, + &dev_attr_spi_device_bytes_tx.attr, + &dev_attr_spi_device_transfer_bytes_histo0.attr, + &dev_attr_spi_device_transfer_bytes_histo1.attr, + &dev_attr_spi_device_transfer_bytes_histo2.attr, + &dev_attr_spi_device_transfer_bytes_histo3.attr, + &dev_attr_spi_device_transfer_bytes_histo4.attr, + &dev_attr_spi_device_transfer_bytes_histo5.attr, + &dev_attr_spi_device_transfer_bytes_histo6.attr, + &dev_attr_spi_device_transfer_bytes_histo7.attr, + &dev_attr_spi_device_transfer_bytes_histo8.attr, + &dev_attr_spi_device_transfer_bytes_histo9.attr, + &dev_attr_spi_device_transfer_bytes_histo10.attr, + &dev_attr_spi_device_transfer_bytes_histo11.attr, + &dev_attr_spi_device_transfer_bytes_histo12.attr, + &dev_attr_spi_device_transfer_bytes_histo13.attr, + &dev_attr_spi_device_transfer_bytes_histo14.attr, + &dev_attr_spi_device_transfer_bytes_histo15.attr, + &dev_attr_spi_device_transfer_bytes_histo16.attr, + &dev_attr_spi_device_transfers_split_maxsize.attr, + NULL, +}; + +static const struct attribute_group spi_device_statistics_group = { + .name = "statistics", + .attrs = spi_device_statistics_attrs, +}; + +static const struct attribute_group *spi_dev_groups[] = { + &spi_dev_group, + &spi_device_statistics_group, + NULL, +}; + +static struct attribute *spi_controller_statistics_attrs[] = { + &dev_attr_spi_controller_messages.attr, + &dev_attr_spi_controller_transfers.attr, + &dev_attr_spi_controller_errors.attr, + &dev_attr_spi_controller_timedout.attr, + &dev_attr_spi_controller_spi_sync.attr, + &dev_attr_spi_controller_spi_sync_immediate.attr, + &dev_attr_spi_controller_spi_async.attr, + &dev_attr_spi_controller_bytes.attr, + &dev_attr_spi_controller_bytes_rx.attr, + &dev_attr_spi_controller_bytes_tx.attr, + &dev_attr_spi_controller_transfer_bytes_histo0.attr, + &dev_attr_spi_controller_transfer_bytes_histo1.attr, + &dev_attr_spi_controller_transfer_bytes_histo2.attr, + &dev_attr_spi_controller_transfer_bytes_histo3.attr, + &dev_attr_spi_controller_transfer_bytes_histo4.attr, + &dev_attr_spi_controller_transfer_bytes_histo5.attr, + &dev_attr_spi_controller_transfer_bytes_histo6.attr, + &dev_attr_spi_controller_transfer_bytes_histo7.attr, + &dev_attr_spi_controller_transfer_bytes_histo8.attr, + &dev_attr_spi_controller_transfer_bytes_histo9.attr, + &dev_attr_spi_controller_transfer_bytes_histo10.attr, + &dev_attr_spi_controller_transfer_bytes_histo11.attr, + &dev_attr_spi_controller_transfer_bytes_histo12.attr, + &dev_attr_spi_controller_transfer_bytes_histo13.attr, + &dev_attr_spi_controller_transfer_bytes_histo14.attr, + &dev_attr_spi_controller_transfer_bytes_histo15.attr, + &dev_attr_spi_controller_transfer_bytes_histo16.attr, + &dev_attr_spi_controller_transfers_split_maxsize.attr, + NULL, +}; + +static const struct attribute_group spi_controller_statistics_group = { + .name = "statistics", + .attrs = spi_controller_statistics_attrs, +}; + +static const struct attribute_group *spi_master_groups[] = { + &spi_controller_statistics_group, + NULL, +}; + +void spi_statistics_add_transfer_stats(struct spi_statistics *stats, + struct spi_transfer *xfer, + struct spi_controller *ctlr) +{ + unsigned long flags; + int l2len = min(fls(xfer->len), SPI_STATISTICS_HISTO_SIZE) - 1; + + if (l2len < 0) + l2len = 0; + + spin_lock_irqsave(&stats->lock, flags); + + stats->transfers++; + stats->transfer_bytes_histo[l2len]++; + + stats->bytes += xfer->len; + if ((xfer->tx_buf) && + (xfer->tx_buf != ctlr->dummy_tx)) + stats->bytes_tx += xfer->len; + if ((xfer->rx_buf) && + (xfer->rx_buf != ctlr->dummy_rx)) + stats->bytes_rx += xfer->len; + + spin_unlock_irqrestore(&stats->lock, flags); +} +EXPORT_SYMBOL_GPL(spi_statistics_add_transfer_stats); + +/* modalias support makes "modprobe $MODALIAS" new-style hotplug work, + * and the sysfs version makes coldplug work too. + */ + +static const struct spi_device_id *spi_match_id(const struct spi_device_id *id, + const struct spi_device *sdev) +{ + while (id->name[0]) { + if (!strcmp(sdev->modalias, id->name)) + return id; + id++; + } + return NULL; +} + +const struct spi_device_id *spi_get_device_id(const struct spi_device *sdev) +{ + const struct spi_driver *sdrv = to_spi_driver(sdev->dev.driver); + + return spi_match_id(sdrv->id_table, sdev); +} +EXPORT_SYMBOL_GPL(spi_get_device_id); + +static int spi_match_device(struct device *dev, struct device_driver *drv) +{ + const struct spi_device *spi = to_spi_device(dev); + const struct spi_driver *sdrv = to_spi_driver(drv); + + /* Check override first, and if set, only use the named driver */ + if (spi->driver_override) + return strcmp(spi->driver_override, drv->name) == 0; + + /* Attempt an OF style match */ + if (of_driver_match_device(dev, drv)) + return 1; + + /* Then try ACPI */ + if (acpi_driver_match_device(dev, drv)) + return 1; + + if (sdrv->id_table) + return !!spi_match_id(sdrv->id_table, spi); + + return strcmp(spi->modalias, drv->name) == 0; +} + +static int spi_uevent(struct device *dev, struct kobj_uevent_env *env) +{ + const struct spi_device *spi = to_spi_device(dev); + int rc; + + rc = acpi_device_uevent_modalias(dev, env); + if (rc != -ENODEV) + return rc; + + return add_uevent_var(env, "MODALIAS=%s%s", SPI_MODULE_PREFIX, spi->modalias); +} + +struct bus_type spi_bus_type = { + .name = "spi", + .dev_groups = spi_dev_groups, + .match = spi_match_device, + .uevent = spi_uevent, +}; +EXPORT_SYMBOL_GPL(spi_bus_type); + + +static int spi_drv_probe(struct device *dev) +{ + const struct spi_driver *sdrv = to_spi_driver(dev->driver); + struct spi_device *spi = to_spi_device(dev); + int ret; + + ret = of_clk_set_defaults(dev->of_node, false); + if (ret) + return ret; + + if (dev->of_node) { + spi->irq = of_irq_get(dev->of_node, 0); + if (spi->irq == -EPROBE_DEFER) + return -EPROBE_DEFER; + if (spi->irq < 0) + spi->irq = 0; + } + + ret = dev_pm_domain_attach(dev, true); + if (ret) + return ret; + + if (sdrv->probe) { + ret = sdrv->probe(spi); + if (ret) + dev_pm_domain_detach(dev, true); + } + + return ret; +} + +static int spi_drv_remove(struct device *dev) +{ + const struct spi_driver *sdrv = to_spi_driver(dev->driver); + int ret = 0; + + if (sdrv->remove) + ret = sdrv->remove(to_spi_device(dev)); + dev_pm_domain_detach(dev, true); + + return ret; +} + +static void spi_drv_shutdown(struct device *dev) +{ + const struct spi_driver *sdrv = to_spi_driver(dev->driver); + + sdrv->shutdown(to_spi_device(dev)); +} + +/** + * __spi_register_driver - register a SPI driver + * @owner: owner module of the driver to register + * @sdrv: the driver to register + * Context: can sleep + * + * Return: zero on success, else a negative error code. + */ +int __spi_register_driver(struct module *owner, struct spi_driver *sdrv) +{ + sdrv->driver.owner = owner; + sdrv->driver.bus = &spi_bus_type; + sdrv->driver.probe = spi_drv_probe; + sdrv->driver.remove = spi_drv_remove; + if (sdrv->shutdown) + sdrv->driver.shutdown = spi_drv_shutdown; + return driver_register(&sdrv->driver); +} +EXPORT_SYMBOL_GPL(__spi_register_driver); + +/*-------------------------------------------------------------------------*/ + +/* SPI devices should normally not be created by SPI device drivers; that + * would make them board-specific. Similarly with SPI controller drivers. + * Device registration normally goes into like arch/.../mach.../board-YYY.c + * with other readonly (flashable) information about mainboard devices. + */ + +struct boardinfo { + struct list_head list; + struct spi_board_info board_info; +}; + +static LIST_HEAD(board_list); +static LIST_HEAD(spi_controller_list); + +/* + * Used to protect add/del operation for board_info list and + * spi_controller list, and their matching process + * also used to protect object of type struct idr + */ +static DEFINE_MUTEX(board_lock); + +/* + * Prevents addition of devices with same chip select and + * addition of devices below an unregistering controller. + */ +static DEFINE_MUTEX(spi_add_lock); + +/** + * spi_alloc_device - Allocate a new SPI device + * @ctlr: Controller to which device is connected + * Context: can sleep + * + * Allows a driver to allocate and initialize a spi_device without + * registering it immediately. This allows a driver to directly + * fill the spi_device with device parameters before calling + * spi_add_device() on it. + * + * Caller is responsible to call spi_add_device() on the returned + * spi_device structure to add it to the SPI controller. If the caller + * needs to discard the spi_device without adding it, then it should + * call spi_dev_put() on it. + * + * Return: a pointer to the new device, or NULL. + */ +struct spi_device *spi_alloc_device(struct spi_controller *ctlr) +{ + struct spi_device *spi; + + if (!spi_controller_get(ctlr)) + return NULL; + + spi = kzalloc(sizeof(*spi), GFP_KERNEL); + if (!spi) { + spi_controller_put(ctlr); + return NULL; + } + + spi->master = spi->controller = ctlr; + spi->dev.parent = &ctlr->dev; + spi->dev.bus = &spi_bus_type; + spi->dev.release = spidev_release; + spi->cs_gpio = -ENOENT; + spi->mode = ctlr->buswidth_override_bits; + + spin_lock_init(&spi->statistics.lock); + + device_initialize(&spi->dev); + return spi; +} +EXPORT_SYMBOL_GPL(spi_alloc_device); + +static void spi_dev_set_name(struct spi_device *spi) +{ + struct acpi_device *adev = ACPI_COMPANION(&spi->dev); + + if (adev) { + dev_set_name(&spi->dev, "spi-%s", acpi_dev_name(adev)); + return; + } + + dev_set_name(&spi->dev, "%s.%u", dev_name(&spi->controller->dev), + spi->chip_select); +} + +static int spi_dev_check(struct device *dev, void *data) +{ + struct spi_device *spi = to_spi_device(dev); + struct spi_device *new_spi = data; + + if (spi->controller == new_spi->controller && + spi->chip_select == new_spi->chip_select) + return -EBUSY; + return 0; +} + +static void spi_cleanup(struct spi_device *spi) +{ + if (spi->controller->cleanup) + spi->controller->cleanup(spi); +} + +/** + * spi_add_device - Add spi_device allocated with spi_alloc_device + * @spi: spi_device to register + * + * Companion function to spi_alloc_device. Devices allocated with + * spi_alloc_device can be added onto the spi bus with this function. + * + * Return: 0 on success; negative errno on failure + */ +int spi_add_device(struct spi_device *spi) +{ + struct spi_controller *ctlr = spi->controller; + struct device *dev = ctlr->dev.parent; + int status; + + /* Chipselects are numbered 0..max; validate. */ + if (spi->chip_select >= ctlr->num_chipselect) { + dev_err(dev, "cs%d >= max %d\n", spi->chip_select, + ctlr->num_chipselect); + return -EINVAL; + } + + /* Set the bus ID string */ + spi_dev_set_name(spi); + + /* We need to make sure there's no other device with this + * chipselect **BEFORE** we call setup(), else we'll trash + * its configuration. Lock against concurrent add() calls. + */ + mutex_lock(&spi_add_lock); + + status = bus_for_each_dev(&spi_bus_type, NULL, spi, spi_dev_check); + if (status) { + dev_err(dev, "chipselect %d already in use\n", + spi->chip_select); + goto done; + } + + /* Controller may unregister concurrently */ + if (IS_ENABLED(CONFIG_SPI_DYNAMIC) && + !device_is_registered(&ctlr->dev)) { + status = -ENODEV; + goto done; + } + + /* Descriptors take precedence */ + if (ctlr->cs_gpiods) + spi->cs_gpiod = ctlr->cs_gpiods[spi->chip_select]; + else if (ctlr->cs_gpios) + spi->cs_gpio = ctlr->cs_gpios[spi->chip_select]; + + /* Drivers may modify this initial i/o setup, but will + * normally rely on the device being setup. Devices + * using SPI_CS_HIGH can't coexist well otherwise... + */ + status = spi_setup(spi); + if (status < 0) { + dev_err(dev, "can't setup %s, status %d\n", + dev_name(&spi->dev), status); + goto done; + } + + /* Device may be bound to an active driver when this returns */ + status = device_add(&spi->dev); + if (status < 0) { + dev_err(dev, "can't add %s, status %d\n", + dev_name(&spi->dev), status); + spi_cleanup(spi); + } else { + dev_dbg(dev, "registered child %s\n", dev_name(&spi->dev)); + } + +done: + mutex_unlock(&spi_add_lock); + return status; +} +EXPORT_SYMBOL_GPL(spi_add_device); + +/** + * spi_new_device - instantiate one new SPI device + * @ctlr: Controller to which device is connected + * @chip: Describes the SPI device + * Context: can sleep + * + * On typical mainboards, this is purely internal; and it's not needed + * after board init creates the hard-wired devices. Some development + * platforms may not be able to use spi_register_board_info though, and + * this is exported so that for example a USB or parport based adapter + * driver could add devices (which it would learn about out-of-band). + * + * Return: the new device, or NULL. + */ +struct spi_device *spi_new_device(struct spi_controller *ctlr, + struct spi_board_info *chip) +{ + struct spi_device *proxy; + int status; + + /* NOTE: caller did any chip->bus_num checks necessary. + * + * Also, unless we change the return value convention to use + * error-or-pointer (not NULL-or-pointer), troubleshootability + * suggests syslogged diagnostics are best here (ugh). + */ + + proxy = spi_alloc_device(ctlr); + if (!proxy) + return NULL; + + WARN_ON(strlen(chip->modalias) >= sizeof(proxy->modalias)); + + proxy->chip_select = chip->chip_select; + proxy->max_speed_hz = chip->max_speed_hz; + proxy->mode = chip->mode; + proxy->irq = chip->irq; + strlcpy(proxy->modalias, chip->modalias, sizeof(proxy->modalias)); + proxy->dev.platform_data = (void *) chip->platform_data; + proxy->controller_data = chip->controller_data; + proxy->controller_state = NULL; + + if (chip->properties) { + status = device_add_properties(&proxy->dev, chip->properties); + if (status) { + dev_err(&ctlr->dev, + "failed to add properties to '%s': %d\n", + chip->modalias, status); + goto err_dev_put; + } + } + + status = spi_add_device(proxy); + if (status < 0) + goto err_remove_props; + + return proxy; + +err_remove_props: + if (chip->properties) + device_remove_properties(&proxy->dev); +err_dev_put: + spi_dev_put(proxy); + return NULL; +} +EXPORT_SYMBOL_GPL(spi_new_device); + +/** + * spi_unregister_device - unregister a single SPI device + * @spi: spi_device to unregister + * + * Start making the passed SPI device vanish. Normally this would be handled + * by spi_unregister_controller(). + */ +void spi_unregister_device(struct spi_device *spi) +{ + if (!spi) + return; + + if (spi->dev.of_node) { + of_node_clear_flag(spi->dev.of_node, OF_POPULATED); + of_node_put(spi->dev.of_node); + } + if (ACPI_COMPANION(&spi->dev)) + acpi_device_clear_enumerated(ACPI_COMPANION(&spi->dev)); + device_del(&spi->dev); + spi_cleanup(spi); + put_device(&spi->dev); +} +EXPORT_SYMBOL_GPL(spi_unregister_device); + +static void spi_match_controller_to_boardinfo(struct spi_controller *ctlr, + struct spi_board_info *bi) +{ + struct spi_device *dev; + + if (ctlr->bus_num != bi->bus_num) + return; + + dev = spi_new_device(ctlr, bi); + if (!dev) + dev_err(ctlr->dev.parent, "can't create new device for %s\n", + bi->modalias); +} + +/** + * spi_register_board_info - register SPI devices for a given board + * @info: array of chip descriptors + * @n: how many descriptors are provided + * Context: can sleep + * + * Board-specific early init code calls this (probably during arch_initcall) + * with segments of the SPI device table. Any device nodes are created later, + * after the relevant parent SPI controller (bus_num) is defined. We keep + * this table of devices forever, so that reloading a controller driver will + * not make Linux forget about these hard-wired devices. + * + * Other code can also call this, e.g. a particular add-on board might provide + * SPI devices through its expansion connector, so code initializing that board + * would naturally declare its SPI devices. + * + * The board info passed can safely be __initdata ... but be careful of + * any embedded pointers (platform_data, etc), they're copied as-is. + * Device properties are deep-copied though. + * + * Return: zero on success, else a negative error code. + */ +int spi_register_board_info(struct spi_board_info const *info, unsigned n) +{ + struct boardinfo *bi; + int i; + + if (!n) + return 0; + + bi = kcalloc(n, sizeof(*bi), GFP_KERNEL); + if (!bi) + return -ENOMEM; + + for (i = 0; i < n; i++, bi++, info++) { + struct spi_controller *ctlr; + + memcpy(&bi->board_info, info, sizeof(*info)); + if (info->properties) { + bi->board_info.properties = + property_entries_dup(info->properties); + if (IS_ERR(bi->board_info.properties)) + return PTR_ERR(bi->board_info.properties); + } + + mutex_lock(&board_lock); + list_add_tail(&bi->list, &board_list); + list_for_each_entry(ctlr, &spi_controller_list, list) + spi_match_controller_to_boardinfo(ctlr, + &bi->board_info); + mutex_unlock(&board_lock); + } + + return 0; +} + +/*-------------------------------------------------------------------------*/ + +static void spi_set_cs(struct spi_device *spi, bool enable, bool force) +{ + bool enable1 = enable; + + /* + * Avoid calling into the driver (or doing delays) if the chip select + * isn't actually changing from the last time this was called. + */ + if (!force && (spi->controller->last_cs_enable == enable) && + (spi->controller->last_cs_mode_high == (spi->mode & SPI_CS_HIGH))) + return; + + spi->controller->last_cs_enable = enable; + spi->controller->last_cs_mode_high = spi->mode & SPI_CS_HIGH; + + if (!spi->controller->set_cs_timing) { + if (enable1) + spi_delay_exec(&spi->controller->cs_setup, NULL); + else + spi_delay_exec(&spi->controller->cs_hold, NULL); + } + + if (spi->mode & SPI_CS_HIGH) + enable = !enable; + + if (spi->cs_gpiod || gpio_is_valid(spi->cs_gpio)) { + if (!(spi->mode & SPI_NO_CS)) { + if (spi->cs_gpiod) { + /* + * Historically ACPI has no means of the GPIO polarity and + * thus the SPISerialBus() resource defines it on the per-chip + * basis. In order to avoid a chain of negations, the GPIO + * polarity is considered being Active High. Even for the cases + * when _DSD() is involved (in the updated versions of ACPI) + * the GPIO CS polarity must be defined Active High to avoid + * ambiguity. That's why we use enable, that takes SPI_CS_HIGH + * into account. + */ + if (has_acpi_companion(&spi->dev)) + gpiod_set_value_cansleep(spi->cs_gpiod, !enable); + else + /* Polarity handled by GPIO library */ + gpiod_set_value_cansleep(spi->cs_gpiod, enable1); + } else { + /* + * invert the enable line, as active low is + * default for SPI. + */ + gpio_set_value_cansleep(spi->cs_gpio, !enable); + } + } + /* Some SPI masters need both GPIO CS & slave_select */ + if ((spi->controller->flags & SPI_MASTER_GPIO_SS) && + spi->controller->set_cs) + spi->controller->set_cs(spi, !enable); + } else if (spi->controller->set_cs) { + spi->controller->set_cs(spi, !enable); + } + + if (!spi->controller->set_cs_timing) { + if (!enable1) + spi_delay_exec(&spi->controller->cs_inactive, NULL); + } +} + +#ifdef CONFIG_HAS_DMA +int spi_map_buf(struct spi_controller *ctlr, struct device *dev, + struct sg_table *sgt, void *buf, size_t len, + enum dma_data_direction dir) +{ + const bool vmalloced_buf = is_vmalloc_addr(buf); + unsigned int max_seg_size = dma_get_max_seg_size(dev); +#ifdef CONFIG_HIGHMEM + const bool kmap_buf = ((unsigned long)buf >= PKMAP_BASE && + (unsigned long)buf < (PKMAP_BASE + + (LAST_PKMAP * PAGE_SIZE))); +#else + const bool kmap_buf = false; +#endif + int desc_len; + int sgs; + struct page *vm_page; + struct scatterlist *sg; + void *sg_buf; + size_t min; + int i, ret; + + if (vmalloced_buf || kmap_buf) { + desc_len = min_t(unsigned long, max_seg_size, PAGE_SIZE); + sgs = DIV_ROUND_UP(len + offset_in_page(buf), desc_len); + } else if (virt_addr_valid(buf)) { + desc_len = min_t(size_t, max_seg_size, ctlr->max_dma_len); + sgs = DIV_ROUND_UP(len, desc_len); + } else { + return -EINVAL; + } + + ret = sg_alloc_table(sgt, sgs, GFP_KERNEL); + if (ret != 0) + return ret; + + sg = &sgt->sgl[0]; + for (i = 0; i < sgs; i++) { + + if (vmalloced_buf || kmap_buf) { + /* + * Next scatterlist entry size is the minimum between + * the desc_len and the remaining buffer length that + * fits in a page. + */ + min = min_t(size_t, desc_len, + min_t(size_t, len, + PAGE_SIZE - offset_in_page(buf))); + if (vmalloced_buf) + vm_page = vmalloc_to_page(buf); + else + vm_page = kmap_to_page(buf); + if (!vm_page) { + sg_free_table(sgt); + return -ENOMEM; + } + sg_set_page(sg, vm_page, + min, offset_in_page(buf)); + } else { + min = min_t(size_t, len, desc_len); + sg_buf = buf; + sg_set_buf(sg, sg_buf, min); + } + + buf += min; + len -= min; + sg = sg_next(sg); + } + + ret = dma_map_sg(dev, sgt->sgl, sgt->nents, dir); + if (!ret) + ret = -ENOMEM; + if (ret < 0) { + sg_free_table(sgt); + return ret; + } + + sgt->nents = ret; + + return 0; +} + +void spi_unmap_buf(struct spi_controller *ctlr, struct device *dev, + struct sg_table *sgt, enum dma_data_direction dir) +{ + if (sgt->orig_nents) { + dma_unmap_sg(dev, sgt->sgl, sgt->orig_nents, dir); + sg_free_table(sgt); + sgt->orig_nents = 0; + sgt->nents = 0; + } +} + +static int __spi_map_msg(struct spi_controller *ctlr, struct spi_message *msg) +{ + struct device *tx_dev, *rx_dev; + struct spi_transfer *xfer; + int ret; + + if (!ctlr->can_dma) + return 0; + + if (ctlr->dma_tx) + tx_dev = ctlr->dma_tx->device->dev; + else + tx_dev = ctlr->dev.parent; + + if (ctlr->dma_rx) + rx_dev = ctlr->dma_rx->device->dev; + else + rx_dev = ctlr->dev.parent; + + list_for_each_entry(xfer, &msg->transfers, transfer_list) { + if (!ctlr->can_dma(ctlr, msg->spi, xfer)) + continue; + + if (xfer->tx_buf != NULL) { + ret = spi_map_buf(ctlr, tx_dev, &xfer->tx_sg, + (void *)xfer->tx_buf, xfer->len, + DMA_TO_DEVICE); + if (ret != 0) + return ret; + } + + if (xfer->rx_buf != NULL) { + ret = spi_map_buf(ctlr, rx_dev, &xfer->rx_sg, + xfer->rx_buf, xfer->len, + DMA_FROM_DEVICE); + if (ret != 0) { + spi_unmap_buf(ctlr, tx_dev, &xfer->tx_sg, + DMA_TO_DEVICE); + return ret; + } + } + } + + ctlr->cur_msg_mapped = true; + + return 0; +} + +static int __spi_unmap_msg(struct spi_controller *ctlr, struct spi_message *msg) +{ + struct spi_transfer *xfer; + struct device *tx_dev, *rx_dev; + + if (!ctlr->cur_msg_mapped || !ctlr->can_dma) + return 0; + + if (ctlr->dma_tx) + tx_dev = ctlr->dma_tx->device->dev; + else + tx_dev = ctlr->dev.parent; + + if (ctlr->dma_rx) + rx_dev = ctlr->dma_rx->device->dev; + else + rx_dev = ctlr->dev.parent; + + list_for_each_entry(xfer, &msg->transfers, transfer_list) { + if (!ctlr->can_dma(ctlr, msg->spi, xfer)) + continue; + + spi_unmap_buf(ctlr, rx_dev, &xfer->rx_sg, DMA_FROM_DEVICE); + spi_unmap_buf(ctlr, tx_dev, &xfer->tx_sg, DMA_TO_DEVICE); + } + + ctlr->cur_msg_mapped = false; + + return 0; +} +#else /* !CONFIG_HAS_DMA */ +static inline int __spi_map_msg(struct spi_controller *ctlr, + struct spi_message *msg) +{ + return 0; +} + +static inline int __spi_unmap_msg(struct spi_controller *ctlr, + struct spi_message *msg) +{ + return 0; +} +#endif /* !CONFIG_HAS_DMA */ + +static inline int spi_unmap_msg(struct spi_controller *ctlr, + struct spi_message *msg) +{ + struct spi_transfer *xfer; + + list_for_each_entry(xfer, &msg->transfers, transfer_list) { + /* + * Restore the original value of tx_buf or rx_buf if they are + * NULL. + */ + if (xfer->tx_buf == ctlr->dummy_tx) + xfer->tx_buf = NULL; + if (xfer->rx_buf == ctlr->dummy_rx) + xfer->rx_buf = NULL; + } + + return __spi_unmap_msg(ctlr, msg); +} + +static int spi_map_msg(struct spi_controller *ctlr, struct spi_message *msg) +{ + struct spi_transfer *xfer; + void *tmp; + unsigned int max_tx, max_rx; + + if ((ctlr->flags & (SPI_CONTROLLER_MUST_RX | SPI_CONTROLLER_MUST_TX)) + && !(msg->spi->mode & SPI_3WIRE)) { + max_tx = 0; + max_rx = 0; + + list_for_each_entry(xfer, &msg->transfers, transfer_list) { + if ((ctlr->flags & SPI_CONTROLLER_MUST_TX) && + !xfer->tx_buf) + max_tx = max(xfer->len, max_tx); + if ((ctlr->flags & SPI_CONTROLLER_MUST_RX) && + !xfer->rx_buf) + max_rx = max(xfer->len, max_rx); + } + + if (max_tx) { + tmp = krealloc(ctlr->dummy_tx, max_tx, + GFP_KERNEL | GFP_DMA); + if (!tmp) + return -ENOMEM; + ctlr->dummy_tx = tmp; + memset(tmp, 0, max_tx); + } + + if (max_rx) { + tmp = krealloc(ctlr->dummy_rx, max_rx, + GFP_KERNEL | GFP_DMA); + if (!tmp) + return -ENOMEM; + ctlr->dummy_rx = tmp; + } + + if (max_tx || max_rx) { + list_for_each_entry(xfer, &msg->transfers, + transfer_list) { + if (!xfer->len) + continue; + if (!xfer->tx_buf) + xfer->tx_buf = ctlr->dummy_tx; + if (!xfer->rx_buf) + xfer->rx_buf = ctlr->dummy_rx; + } + } + } + + return __spi_map_msg(ctlr, msg); +} + +static int spi_transfer_wait(struct spi_controller *ctlr, + struct spi_message *msg, + struct spi_transfer *xfer) +{ + struct spi_statistics *statm = &ctlr->statistics; + struct spi_statistics *stats = &msg->spi->statistics; + u32 speed_hz = xfer->speed_hz; + unsigned long long ms; + + if (spi_controller_is_slave(ctlr)) { + if (wait_for_completion_interruptible(&ctlr->xfer_completion)) { + dev_dbg(&msg->spi->dev, "SPI transfer interrupted\n"); + return -EINTR; + } + } else { + if (!speed_hz) + speed_hz = 100000; + + ms = 8LL * 1000LL * xfer->len; + do_div(ms, speed_hz); + ms += ms + 200; /* some tolerance */ + + if (ms > UINT_MAX) + ms = UINT_MAX; + + ms = wait_for_completion_timeout(&ctlr->xfer_completion, + msecs_to_jiffies(ms)); + + if (ms == 0) { + SPI_STATISTICS_INCREMENT_FIELD(statm, timedout); + SPI_STATISTICS_INCREMENT_FIELD(stats, timedout); + dev_err(&msg->spi->dev, + "SPI transfer timed out\n"); + return -ETIMEDOUT; + } + } + + return 0; +} + +static void _spi_transfer_delay_ns(u32 ns) +{ + if (!ns) + return; + if (ns <= 1000) { + ndelay(ns); + } else { + u32 us = DIV_ROUND_UP(ns, 1000); + + if (us <= 10) + udelay(us); + else + usleep_range(us, us + DIV_ROUND_UP(us, 10)); + } +} + +int spi_delay_to_ns(struct spi_delay *_delay, struct spi_transfer *xfer) +{ + u32 delay = _delay->value; + u32 unit = _delay->unit; + u32 hz; + + if (!delay) + return 0; + + switch (unit) { + case SPI_DELAY_UNIT_USECS: + delay *= 1000; + break; + case SPI_DELAY_UNIT_NSECS: /* nothing to do here */ + break; + case SPI_DELAY_UNIT_SCK: + /* clock cycles need to be obtained from spi_transfer */ + if (!xfer) + return -EINVAL; + /* if there is no effective speed know, then approximate + * by underestimating with half the requested hz + */ + hz = xfer->effective_speed_hz ?: xfer->speed_hz / 2; + if (!hz) + return -EINVAL; + delay *= DIV_ROUND_UP(1000000000, hz); + break; + default: + return -EINVAL; + } + + return delay; +} +EXPORT_SYMBOL_GPL(spi_delay_to_ns); + +int spi_delay_exec(struct spi_delay *_delay, struct spi_transfer *xfer) +{ + int delay; + + might_sleep(); + + if (!_delay) + return -EINVAL; + + delay = spi_delay_to_ns(_delay, xfer); + if (delay < 0) + return delay; + + _spi_transfer_delay_ns(delay); + + return 0; +} +EXPORT_SYMBOL_GPL(spi_delay_exec); + +static void _spi_transfer_cs_change_delay(struct spi_message *msg, + struct spi_transfer *xfer) +{ + u32 delay = xfer->cs_change_delay.value; + u32 unit = xfer->cs_change_delay.unit; + int ret; + + /* return early on "fast" mode - for everything but USECS */ + if (!delay) { + if (unit == SPI_DELAY_UNIT_USECS) + _spi_transfer_delay_ns(10000); + return; + } + + ret = spi_delay_exec(&xfer->cs_change_delay, xfer); + if (ret) { + dev_err_once(&msg->spi->dev, + "Use of unsupported delay unit %i, using default of 10us\n", + unit); + _spi_transfer_delay_ns(10000); + } +} + +/* + * spi_transfer_one_message - Default implementation of transfer_one_message() + * + * This is a standard implementation of transfer_one_message() for + * drivers which implement a transfer_one() operation. It provides + * standard handling of delays and chip select management. + */ +static int spi_transfer_one_message(struct spi_controller *ctlr, + struct spi_message *msg) +{ + struct spi_transfer *xfer; + bool keep_cs = false; + int ret = 0; + struct spi_statistics *statm = &ctlr->statistics; + struct spi_statistics *stats = &msg->spi->statistics; + + spi_set_cs(msg->spi, true, false); + + SPI_STATISTICS_INCREMENT_FIELD(statm, messages); + SPI_STATISTICS_INCREMENT_FIELD(stats, messages); + + list_for_each_entry(xfer, &msg->transfers, transfer_list) { + trace_spi_transfer_start(msg, xfer); + + spi_statistics_add_transfer_stats(statm, xfer, ctlr); + spi_statistics_add_transfer_stats(stats, xfer, ctlr); + + if (!ctlr->ptp_sts_supported) { + xfer->ptp_sts_word_pre = 0; + ptp_read_system_prets(xfer->ptp_sts); + } + + if ((xfer->tx_buf || xfer->rx_buf) && xfer->len) { + reinit_completion(&ctlr->xfer_completion); + +fallback_pio: + ret = ctlr->transfer_one(ctlr, msg->spi, xfer); + if (ret < 0) { + if (ctlr->cur_msg_mapped && + (xfer->error & SPI_TRANS_FAIL_NO_START)) { + __spi_unmap_msg(ctlr, msg); + ctlr->fallback = true; + xfer->error &= ~SPI_TRANS_FAIL_NO_START; + goto fallback_pio; + } + + SPI_STATISTICS_INCREMENT_FIELD(statm, + errors); + SPI_STATISTICS_INCREMENT_FIELD(stats, + errors); + dev_err(&msg->spi->dev, + "SPI transfer failed: %d\n", ret); + goto out; + } + + if (ret > 0) { + ret = spi_transfer_wait(ctlr, msg, xfer); + if (ret < 0) + msg->status = ret; + } + } else { + if (xfer->len) + dev_err(&msg->spi->dev, + "Bufferless transfer has length %u\n", + xfer->len); + } + + if (!ctlr->ptp_sts_supported) { + ptp_read_system_postts(xfer->ptp_sts); + xfer->ptp_sts_word_post = xfer->len; + } + + trace_spi_transfer_stop(msg, xfer); + + if (msg->status != -EINPROGRESS) + goto out; + + spi_transfer_delay_exec(xfer); + + if (xfer->cs_change) { + if (list_is_last(&xfer->transfer_list, + &msg->transfers)) { + keep_cs = true; + } else { + spi_set_cs(msg->spi, false, false); + _spi_transfer_cs_change_delay(msg, xfer); + spi_set_cs(msg->spi, true, false); + } + } + + msg->actual_length += xfer->len; + } + +out: + if (ret != 0 || !keep_cs) + spi_set_cs(msg->spi, false, false); + + if (msg->status == -EINPROGRESS) + msg->status = ret; + + if (msg->status && ctlr->handle_err) + ctlr->handle_err(ctlr, msg); + + spi_finalize_current_message(ctlr); + + return ret; +} + +/** + * spi_finalize_current_transfer - report completion of a transfer + * @ctlr: the controller reporting completion + * + * Called by SPI drivers using the core transfer_one_message() + * implementation to notify it that the current interrupt driven + * transfer has finished and the next one may be scheduled. + */ +void spi_finalize_current_transfer(struct spi_controller *ctlr) +{ + complete(&ctlr->xfer_completion); +} +EXPORT_SYMBOL_GPL(spi_finalize_current_transfer); + +static void spi_idle_runtime_pm(struct spi_controller *ctlr) +{ + if (ctlr->auto_runtime_pm) { + pm_runtime_mark_last_busy(ctlr->dev.parent); + pm_runtime_put_autosuspend(ctlr->dev.parent); + } +} + +/** + * __spi_pump_messages - function which processes spi message queue + * @ctlr: controller to process queue for + * @in_kthread: true if we are in the context of the message pump thread + * + * This function checks if there is any spi message in the queue that + * needs processing and if so call out to the driver to initialize hardware + * and transfer each message. + * + * Note that it is called both from the kthread itself and also from + * inside spi_sync(); the queue extraction handling at the top of the + * function should deal with this safely. + */ +static void __spi_pump_messages(struct spi_controller *ctlr, bool in_kthread) +{ + struct spi_transfer *xfer; + struct spi_message *msg; + bool was_busy = false; + unsigned long flags; + int ret; + + /* Lock queue */ + spin_lock_irqsave(&ctlr->queue_lock, flags); + + /* Make sure we are not already running a message */ + if (ctlr->cur_msg) { + spin_unlock_irqrestore(&ctlr->queue_lock, flags); + return; + } + + /* If another context is idling the device then defer */ + if (ctlr->idling) { + kthread_queue_work(ctlr->kworker, &ctlr->pump_messages); + spin_unlock_irqrestore(&ctlr->queue_lock, flags); + return; + } + + /* Check if the queue is idle */ + if (list_empty(&ctlr->queue) || !ctlr->running) { + if (!ctlr->busy) { + spin_unlock_irqrestore(&ctlr->queue_lock, flags); + return; + } + + /* Defer any non-atomic teardown to the thread */ + if (!in_kthread) { + if (!ctlr->dummy_rx && !ctlr->dummy_tx && + !ctlr->unprepare_transfer_hardware) { + spi_idle_runtime_pm(ctlr); + ctlr->busy = false; + trace_spi_controller_idle(ctlr); + } else { + kthread_queue_work(ctlr->kworker, + &ctlr->pump_messages); + } + spin_unlock_irqrestore(&ctlr->queue_lock, flags); + return; + } + + ctlr->busy = false; + ctlr->idling = true; + spin_unlock_irqrestore(&ctlr->queue_lock, flags); + + kfree(ctlr->dummy_rx); + ctlr->dummy_rx = NULL; + kfree(ctlr->dummy_tx); + ctlr->dummy_tx = NULL; + if (ctlr->unprepare_transfer_hardware && + ctlr->unprepare_transfer_hardware(ctlr)) + dev_err(&ctlr->dev, + "failed to unprepare transfer hardware\n"); + spi_idle_runtime_pm(ctlr); + trace_spi_controller_idle(ctlr); + + spin_lock_irqsave(&ctlr->queue_lock, flags); + ctlr->idling = false; + spin_unlock_irqrestore(&ctlr->queue_lock, flags); + return; + } + + /* Extract head of queue */ + msg = list_first_entry(&ctlr->queue, struct spi_message, queue); + ctlr->cur_msg = msg; + + list_del_init(&msg->queue); + if (ctlr->busy) + was_busy = true; + else + ctlr->busy = true; + spin_unlock_irqrestore(&ctlr->queue_lock, flags); + + mutex_lock(&ctlr->io_mutex); + + if (!was_busy && ctlr->auto_runtime_pm) { + ret = pm_runtime_get_sync(ctlr->dev.parent); + if (ret < 0) { + pm_runtime_put_noidle(ctlr->dev.parent); + dev_err(&ctlr->dev, "Failed to power device: %d\n", + ret); + mutex_unlock(&ctlr->io_mutex); + return; + } + } + + if (!was_busy) + trace_spi_controller_busy(ctlr); + + if (!was_busy && ctlr->prepare_transfer_hardware) { + ret = ctlr->prepare_transfer_hardware(ctlr); + if (ret) { + dev_err(&ctlr->dev, + "failed to prepare transfer hardware: %d\n", + ret); + + if (ctlr->auto_runtime_pm) + pm_runtime_put(ctlr->dev.parent); + + msg->status = ret; + spi_finalize_current_message(ctlr); + + mutex_unlock(&ctlr->io_mutex); + return; + } + } + + trace_spi_message_start(msg); + + if (ctlr->prepare_message) { + ret = ctlr->prepare_message(ctlr, msg); + if (ret) { + dev_err(&ctlr->dev, "failed to prepare message: %d\n", + ret); + msg->status = ret; + spi_finalize_current_message(ctlr); + goto out; + } + ctlr->cur_msg_prepared = true; + } + + ret = spi_map_msg(ctlr, msg); + if (ret) { + msg->status = ret; + spi_finalize_current_message(ctlr); + goto out; + } + + if (!ctlr->ptp_sts_supported && !ctlr->transfer_one) { + list_for_each_entry(xfer, &msg->transfers, transfer_list) { + xfer->ptp_sts_word_pre = 0; + ptp_read_system_prets(xfer->ptp_sts); + } + } + + ret = ctlr->transfer_one_message(ctlr, msg); + if (ret) { + dev_err(&ctlr->dev, + "failed to transfer one message from queue\n"); + goto out; + } + +out: + mutex_unlock(&ctlr->io_mutex); + + /* Prod the scheduler in case transfer_one() was busy waiting */ + if (!ret) + cond_resched(); +} + +/** + * spi_pump_messages - kthread work function which processes spi message queue + * @work: pointer to kthread work struct contained in the controller struct + */ +static void spi_pump_messages(struct kthread_work *work) +{ + struct spi_controller *ctlr = + container_of(work, struct spi_controller, pump_messages); + + __spi_pump_messages(ctlr, true); +} + +/** + * spi_take_timestamp_pre - helper for drivers to collect the beginning of the + * TX timestamp for the requested byte from the SPI + * transfer. The frequency with which this function + * must be called (once per word, once for the whole + * transfer, once per batch of words etc) is arbitrary + * as long as the @tx buffer offset is greater than or + * equal to the requested byte at the time of the + * call. The timestamp is only taken once, at the + * first such call. It is assumed that the driver + * advances its @tx buffer pointer monotonically. + * @ctlr: Pointer to the spi_controller structure of the driver + * @xfer: Pointer to the transfer being timestamped + * @progress: How many words (not bytes) have been transferred so far + * @irqs_off: If true, will disable IRQs and preemption for the duration of the + * transfer, for less jitter in time measurement. Only compatible + * with PIO drivers. If true, must follow up with + * spi_take_timestamp_post or otherwise system will crash. + * WARNING: for fully predictable results, the CPU frequency must + * also be under control (governor). + */ +void spi_take_timestamp_pre(struct spi_controller *ctlr, + struct spi_transfer *xfer, + size_t progress, bool irqs_off) +{ + if (!xfer->ptp_sts) + return; + + if (xfer->timestamped) + return; + + if (progress > xfer->ptp_sts_word_pre) + return; + + /* Capture the resolution of the timestamp */ + xfer->ptp_sts_word_pre = progress; + + if (irqs_off) { + local_irq_save(ctlr->irq_flags); + preempt_disable(); + } + + ptp_read_system_prets(xfer->ptp_sts); +} +EXPORT_SYMBOL_GPL(spi_take_timestamp_pre); + +/** + * spi_take_timestamp_post - helper for drivers to collect the end of the + * TX timestamp for the requested byte from the SPI + * transfer. Can be called with an arbitrary + * frequency: only the first call where @tx exceeds + * or is equal to the requested word will be + * timestamped. + * @ctlr: Pointer to the spi_controller structure of the driver + * @xfer: Pointer to the transfer being timestamped + * @progress: How many words (not bytes) have been transferred so far + * @irqs_off: If true, will re-enable IRQs and preemption for the local CPU. + */ +void spi_take_timestamp_post(struct spi_controller *ctlr, + struct spi_transfer *xfer, + size_t progress, bool irqs_off) +{ + if (!xfer->ptp_sts) + return; + + if (xfer->timestamped) + return; + + if (progress < xfer->ptp_sts_word_post) + return; + + ptp_read_system_postts(xfer->ptp_sts); + + if (irqs_off) { + local_irq_restore(ctlr->irq_flags); + preempt_enable(); + } + + /* Capture the resolution of the timestamp */ + xfer->ptp_sts_word_post = progress; + + xfer->timestamped = true; +} +EXPORT_SYMBOL_GPL(spi_take_timestamp_post); + +/** + * spi_set_thread_rt - set the controller to pump at realtime priority + * @ctlr: controller to boost priority of + * + * This can be called because the controller requested realtime priority + * (by setting the ->rt value before calling spi_register_controller()) or + * because a device on the bus said that its transfers needed realtime + * priority. + * + * NOTE: at the moment if any device on a bus says it needs realtime then + * the thread will be at realtime priority for all transfers on that + * controller. If this eventually becomes a problem we may see if we can + * find a way to boost the priority only temporarily during relevant + * transfers. + */ +static void spi_set_thread_rt(struct spi_controller *ctlr) +{ + dev_info(&ctlr->dev, + "will run message pump with realtime priority\n"); + sched_set_fifo(ctlr->kworker->task); +} + +static int spi_init_queue(struct spi_controller *ctlr) +{ + ctlr->running = false; + ctlr->busy = false; + + ctlr->kworker = kthread_create_worker(0, dev_name(&ctlr->dev)); + if (IS_ERR(ctlr->kworker)) { + dev_err(&ctlr->dev, "failed to create message pump kworker\n"); + return PTR_ERR(ctlr->kworker); + } + + kthread_init_work(&ctlr->pump_messages, spi_pump_messages); + + /* + * Controller config will indicate if this controller should run the + * message pump with high (realtime) priority to reduce the transfer + * latency on the bus by minimising the delay between a transfer + * request and the scheduling of the message pump thread. Without this + * setting the message pump thread will remain at default priority. + */ + if (ctlr->rt) + spi_set_thread_rt(ctlr); + + return 0; +} + +/** + * spi_get_next_queued_message() - called by driver to check for queued + * messages + * @ctlr: the controller to check for queued messages + * + * If there are more messages in the queue, the next message is returned from + * this call. + * + * Return: the next message in the queue, else NULL if the queue is empty. + */ +struct spi_message *spi_get_next_queued_message(struct spi_controller *ctlr) +{ + struct spi_message *next; + unsigned long flags; + + /* get a pointer to the next message, if any */ + spin_lock_irqsave(&ctlr->queue_lock, flags); + next = list_first_entry_or_null(&ctlr->queue, struct spi_message, + queue); + spin_unlock_irqrestore(&ctlr->queue_lock, flags); + + return next; +} +EXPORT_SYMBOL_GPL(spi_get_next_queued_message); + +/** + * spi_finalize_current_message() - the current message is complete + * @ctlr: the controller to return the message to + * + * Called by the driver to notify the core that the message in the front of the + * queue is complete and can be removed from the queue. + */ +void spi_finalize_current_message(struct spi_controller *ctlr) +{ + struct spi_transfer *xfer; + struct spi_message *mesg; + unsigned long flags; + int ret; + + spin_lock_irqsave(&ctlr->queue_lock, flags); + mesg = ctlr->cur_msg; + spin_unlock_irqrestore(&ctlr->queue_lock, flags); + + if (!ctlr->ptp_sts_supported && !ctlr->transfer_one) { + list_for_each_entry(xfer, &mesg->transfers, transfer_list) { + ptp_read_system_postts(xfer->ptp_sts); + xfer->ptp_sts_word_post = xfer->len; + } + } + + if (unlikely(ctlr->ptp_sts_supported)) + list_for_each_entry(xfer, &mesg->transfers, transfer_list) + WARN_ON_ONCE(xfer->ptp_sts && !xfer->timestamped); + + spi_unmap_msg(ctlr, mesg); + + /* In the prepare_messages callback the spi bus has the opportunity to + * split a transfer to smaller chunks. + * Release splited transfers here since spi_map_msg is done on the + * splited transfers. + */ + spi_res_release(ctlr, mesg); + + if (ctlr->cur_msg_prepared && ctlr->unprepare_message) { + ret = ctlr->unprepare_message(ctlr, mesg); + if (ret) { + dev_err(&ctlr->dev, "failed to unprepare message: %d\n", + ret); + } + } + + spin_lock_irqsave(&ctlr->queue_lock, flags); + ctlr->cur_msg = NULL; + ctlr->cur_msg_prepared = false; + ctlr->fallback = false; + kthread_queue_work(ctlr->kworker, &ctlr->pump_messages); + spin_unlock_irqrestore(&ctlr->queue_lock, flags); + + trace_spi_message_done(mesg); + + mesg->state = NULL; + if (mesg->complete) + mesg->complete(mesg->context); +} +EXPORT_SYMBOL_GPL(spi_finalize_current_message); + +static int spi_start_queue(struct spi_controller *ctlr) +{ + unsigned long flags; + + spin_lock_irqsave(&ctlr->queue_lock, flags); + + if (ctlr->running || ctlr->busy) { + spin_unlock_irqrestore(&ctlr->queue_lock, flags); + return -EBUSY; + } + + ctlr->running = true; + ctlr->cur_msg = NULL; + spin_unlock_irqrestore(&ctlr->queue_lock, flags); + + kthread_queue_work(ctlr->kworker, &ctlr->pump_messages); + + return 0; +} + +static int spi_stop_queue(struct spi_controller *ctlr) +{ + unsigned long flags; + unsigned limit = 500; + int ret = 0; + + spin_lock_irqsave(&ctlr->queue_lock, flags); + + /* + * This is a bit lame, but is optimized for the common execution path. + * A wait_queue on the ctlr->busy could be used, but then the common + * execution path (pump_messages) would be required to call wake_up or + * friends on every SPI message. Do this instead. + */ + while ((!list_empty(&ctlr->queue) || ctlr->busy) && limit--) { + spin_unlock_irqrestore(&ctlr->queue_lock, flags); + usleep_range(10000, 11000); + spin_lock_irqsave(&ctlr->queue_lock, flags); + } + + if (!list_empty(&ctlr->queue) || ctlr->busy) + ret = -EBUSY; + else + ctlr->running = false; + + spin_unlock_irqrestore(&ctlr->queue_lock, flags); + + if (ret) { + dev_warn(&ctlr->dev, "could not stop message queue\n"); + return ret; + } + return ret; +} + +static int spi_destroy_queue(struct spi_controller *ctlr) +{ + int ret; + + ret = spi_stop_queue(ctlr); + + /* + * kthread_flush_worker will block until all work is done. + * If the reason that stop_queue timed out is that the work will never + * finish, then it does no good to call flush/stop thread, so + * return anyway. + */ + if (ret) { + dev_err(&ctlr->dev, "problem destroying queue\n"); + return ret; + } + + kthread_destroy_worker(ctlr->kworker); + + return 0; +} + +static int __spi_queued_transfer(struct spi_device *spi, + struct spi_message *msg, + bool need_pump) +{ + struct spi_controller *ctlr = spi->controller; + unsigned long flags; + + spin_lock_irqsave(&ctlr->queue_lock, flags); + + if (!ctlr->running) { + spin_unlock_irqrestore(&ctlr->queue_lock, flags); + return -ESHUTDOWN; + } + msg->actual_length = 0; + msg->status = -EINPROGRESS; + + list_add_tail(&msg->queue, &ctlr->queue); + if (!ctlr->busy && need_pump) + kthread_queue_work(ctlr->kworker, &ctlr->pump_messages); + + spin_unlock_irqrestore(&ctlr->queue_lock, flags); + return 0; +} + +/** + * spi_queued_transfer - transfer function for queued transfers + * @spi: spi device which is requesting transfer + * @msg: spi message which is to handled is queued to driver queue + * + * Return: zero on success, else a negative error code. + */ +static int spi_queued_transfer(struct spi_device *spi, struct spi_message *msg) +{ + return __spi_queued_transfer(spi, msg, true); +} + +static int spi_controller_initialize_queue(struct spi_controller *ctlr) +{ + int ret; + + ctlr->transfer = spi_queued_transfer; + if (!ctlr->transfer_one_message) + ctlr->transfer_one_message = spi_transfer_one_message; + + /* Initialize and start queue */ + ret = spi_init_queue(ctlr); + if (ret) { + dev_err(&ctlr->dev, "problem initializing queue\n"); + goto err_init_queue; + } + ctlr->queued = true; + ret = spi_start_queue(ctlr); + if (ret) { + dev_err(&ctlr->dev, "problem starting queue\n"); + goto err_start_queue; + } + + return 0; + +err_start_queue: + spi_destroy_queue(ctlr); +err_init_queue: + return ret; +} + +/** + * spi_flush_queue - Send all pending messages in the queue from the callers' + * context + * @ctlr: controller to process queue for + * + * This should be used when one wants to ensure all pending messages have been + * sent before doing something. Is used by the spi-mem code to make sure SPI + * memory operations do not preempt regular SPI transfers that have been queued + * before the spi-mem operation. + */ +void spi_flush_queue(struct spi_controller *ctlr) +{ + if (ctlr->transfer == spi_queued_transfer) + __spi_pump_messages(ctlr, false); +} + +/*-------------------------------------------------------------------------*/ + +#if defined(CONFIG_OF) +static int of_spi_parse_dt(struct spi_controller *ctlr, struct spi_device *spi, + struct device_node *nc) +{ + u32 value; + int rc; + + /* Mode (clock phase/polarity/etc.) */ + if (of_property_read_bool(nc, "spi-cpha")) + spi->mode |= SPI_CPHA; + if (of_property_read_bool(nc, "spi-cpol")) + spi->mode |= SPI_CPOL; + if (of_property_read_bool(nc, "spi-3wire")) + spi->mode |= SPI_3WIRE; + if (of_property_read_bool(nc, "spi-lsb-first")) + spi->mode |= SPI_LSB_FIRST; + if (of_property_read_bool(nc, "spi-cs-high")) + spi->mode |= SPI_CS_HIGH; + + /* Device DUAL/QUAD mode */ + if (!of_property_read_u32(nc, "spi-tx-bus-width", &value)) { + switch (value) { + case 1: + break; + case 2: + spi->mode |= SPI_TX_DUAL; + break; + case 4: + spi->mode |= SPI_TX_QUAD; + break; + case 8: + spi->mode |= SPI_TX_OCTAL; + break; + default: + dev_warn(&ctlr->dev, + "spi-tx-bus-width %d not supported\n", + value); + break; + } + } + + if (!of_property_read_u32(nc, "spi-rx-bus-width", &value)) { + switch (value) { + case 1: + break; + case 2: + spi->mode |= SPI_RX_DUAL; + break; + case 4: + spi->mode |= SPI_RX_QUAD; + break; + case 8: + spi->mode |= SPI_RX_OCTAL; + break; + default: + dev_warn(&ctlr->dev, + "spi-rx-bus-width %d not supported\n", + value); + break; + } + } + + if (spi_controller_is_slave(ctlr)) { + if (!of_node_name_eq(nc, "slave")) { + dev_err(&ctlr->dev, "%pOF is not called 'slave'\n", + nc); + return -EINVAL; + } + return 0; + } + + /* Device address */ + rc = of_property_read_u32(nc, "reg", &value); + if (rc) { + dev_err(&ctlr->dev, "%pOF has no valid 'reg' property (%d)\n", + nc, rc); + return rc; + } + spi->chip_select = value; + + /* Device speed */ + if (!of_property_read_u32(nc, "spi-max-frequency", &value)) + spi->max_speed_hz = value; + + return 0; +} + +static struct spi_device * +of_register_spi_device(struct spi_controller *ctlr, struct device_node *nc) +{ + struct spi_device *spi; + int rc; + + /* Alloc an spi_device */ + spi = spi_alloc_device(ctlr); + if (!spi) { + dev_err(&ctlr->dev, "spi_device alloc error for %pOF\n", nc); + rc = -ENOMEM; + goto err_out; + } + + /* Select device driver */ + rc = of_modalias_node(nc, spi->modalias, + sizeof(spi->modalias)); + if (rc < 0) { + dev_err(&ctlr->dev, "cannot find modalias for %pOF\n", nc); + goto err_out; + } + + rc = of_spi_parse_dt(ctlr, spi, nc); + if (rc) + goto err_out; + + /* Store a pointer to the node in the device structure */ + of_node_get(nc); + spi->dev.of_node = nc; + spi->dev.fwnode = of_fwnode_handle(nc); + + /* Register the new device */ + rc = spi_add_device(spi); + if (rc) { + dev_err(&ctlr->dev, "spi_device register error %pOF\n", nc); + goto err_of_node_put; + } + + return spi; + +err_of_node_put: + of_node_put(nc); +err_out: + spi_dev_put(spi); + return ERR_PTR(rc); +} + +/** + * of_register_spi_devices() - Register child devices onto the SPI bus + * @ctlr: Pointer to spi_controller device + * + * Registers an spi_device for each child node of controller node which + * represents a valid SPI slave. + */ +static void of_register_spi_devices(struct spi_controller *ctlr) +{ + struct spi_device *spi; + struct device_node *nc; + + if (!ctlr->dev.of_node) + return; + + for_each_available_child_of_node(ctlr->dev.of_node, nc) { + if (of_node_test_and_set_flag(nc, OF_POPULATED)) + continue; + spi = of_register_spi_device(ctlr, nc); + if (IS_ERR(spi)) { + dev_warn(&ctlr->dev, + "Failed to create SPI device for %pOF\n", nc); + of_node_clear_flag(nc, OF_POPULATED); + } + } +} +#else +static void of_register_spi_devices(struct spi_controller *ctlr) { } +#endif + +#ifdef CONFIG_ACPI +struct acpi_spi_lookup { + struct spi_controller *ctlr; + u32 max_speed_hz; + u32 mode; + int irq; + u8 bits_per_word; + u8 chip_select; +}; + +static void acpi_spi_parse_apple_properties(struct acpi_device *dev, + struct acpi_spi_lookup *lookup) +{ + const union acpi_object *obj; + + if (!x86_apple_machine) + return; + + if (!acpi_dev_get_property(dev, "spiSclkPeriod", ACPI_TYPE_BUFFER, &obj) + && obj->buffer.length >= 4) + lookup->max_speed_hz = NSEC_PER_SEC / *(u32 *)obj->buffer.pointer; + + if (!acpi_dev_get_property(dev, "spiWordSize", ACPI_TYPE_BUFFER, &obj) + && obj->buffer.length == 8) + lookup->bits_per_word = *(u64 *)obj->buffer.pointer; + + if (!acpi_dev_get_property(dev, "spiBitOrder", ACPI_TYPE_BUFFER, &obj) + && obj->buffer.length == 8 && !*(u64 *)obj->buffer.pointer) + lookup->mode |= SPI_LSB_FIRST; + + if (!acpi_dev_get_property(dev, "spiSPO", ACPI_TYPE_BUFFER, &obj) + && obj->buffer.length == 8 && *(u64 *)obj->buffer.pointer) + lookup->mode |= SPI_CPOL; + + if (!acpi_dev_get_property(dev, "spiSPH", ACPI_TYPE_BUFFER, &obj) + && obj->buffer.length == 8 && *(u64 *)obj->buffer.pointer) + lookup->mode |= SPI_CPHA; +} + +static int acpi_spi_add_resource(struct acpi_resource *ares, void *data) +{ + struct acpi_spi_lookup *lookup = data; + struct spi_controller *ctlr = lookup->ctlr; + + if (ares->type == ACPI_RESOURCE_TYPE_SERIAL_BUS) { + struct acpi_resource_spi_serialbus *sb; + acpi_handle parent_handle; + acpi_status status; + + sb = &ares->data.spi_serial_bus; + if (sb->type == ACPI_RESOURCE_SERIAL_TYPE_SPI) { + + status = acpi_get_handle(NULL, + sb->resource_source.string_ptr, + &parent_handle); + + if (ACPI_FAILURE(status) || + ACPI_HANDLE(ctlr->dev.parent) != parent_handle) + return -ENODEV; + + /* + * ACPI DeviceSelection numbering is handled by the + * host controller driver in Windows and can vary + * from driver to driver. In Linux we always expect + * 0 .. max - 1 so we need to ask the driver to + * translate between the two schemes. + */ + if (ctlr->fw_translate_cs) { + int cs = ctlr->fw_translate_cs(ctlr, + sb->device_selection); + if (cs < 0) + return cs; + lookup->chip_select = cs; + } else { + lookup->chip_select = sb->device_selection; + } + + lookup->max_speed_hz = sb->connection_speed; + lookup->bits_per_word = sb->data_bit_length; + + if (sb->clock_phase == ACPI_SPI_SECOND_PHASE) + lookup->mode |= SPI_CPHA; + if (sb->clock_polarity == ACPI_SPI_START_HIGH) + lookup->mode |= SPI_CPOL; + if (sb->device_polarity == ACPI_SPI_ACTIVE_HIGH) + lookup->mode |= SPI_CS_HIGH; + } + } else if (lookup->irq < 0) { + struct resource r; + + if (acpi_dev_resource_interrupt(ares, 0, &r)) + lookup->irq = r.start; + } + + /* Always tell the ACPI core to skip this resource */ + return 1; +} + +static acpi_status acpi_register_spi_device(struct spi_controller *ctlr, + struct acpi_device *adev) +{ + acpi_handle parent_handle = NULL; + struct list_head resource_list; + struct acpi_spi_lookup lookup = {}; + struct spi_device *spi; + int ret; + + if (acpi_bus_get_status(adev) || !adev->status.present || + acpi_device_enumerated(adev)) + return AE_OK; + + lookup.ctlr = ctlr; + lookup.irq = -1; + + INIT_LIST_HEAD(&resource_list); + ret = acpi_dev_get_resources(adev, &resource_list, + acpi_spi_add_resource, &lookup); + acpi_dev_free_resource_list(&resource_list); + + if (ret < 0) + /* found SPI in _CRS but it points to another controller */ + return AE_OK; + + if (!lookup.max_speed_hz && + !ACPI_FAILURE(acpi_get_parent(adev->handle, &parent_handle)) && + ACPI_HANDLE(ctlr->dev.parent) == parent_handle) { + /* Apple does not use _CRS but nested devices for SPI slaves */ + acpi_spi_parse_apple_properties(adev, &lookup); + } + + if (!lookup.max_speed_hz) + return AE_OK; + + spi = spi_alloc_device(ctlr); + if (!spi) { + dev_err(&ctlr->dev, "failed to allocate SPI device for %s\n", + dev_name(&adev->dev)); + return AE_NO_MEMORY; + } + + + ACPI_COMPANION_SET(&spi->dev, adev); + spi->max_speed_hz = lookup.max_speed_hz; + spi->mode |= lookup.mode; + spi->irq = lookup.irq; + spi->bits_per_word = lookup.bits_per_word; + spi->chip_select = lookup.chip_select; + + acpi_set_modalias(adev, acpi_device_hid(adev), spi->modalias, + sizeof(spi->modalias)); + + if (spi->irq < 0) + spi->irq = acpi_dev_gpio_irq_get(adev, 0); + + acpi_device_set_enumerated(adev); + + adev->power.flags.ignore_parent = true; + if (spi_add_device(spi)) { + adev->power.flags.ignore_parent = false; + dev_err(&ctlr->dev, "failed to add SPI device %s from ACPI\n", + dev_name(&adev->dev)); + spi_dev_put(spi); + } + + return AE_OK; +} + +static acpi_status acpi_spi_add_device(acpi_handle handle, u32 level, + void *data, void **return_value) +{ + struct spi_controller *ctlr = data; + struct acpi_device *adev; + + if (acpi_bus_get_device(handle, &adev)) + return AE_OK; + + return acpi_register_spi_device(ctlr, adev); +} + +#define SPI_ACPI_ENUMERATE_MAX_DEPTH 32 + +static void acpi_register_spi_devices(struct spi_controller *ctlr) +{ + acpi_status status; + acpi_handle handle; + + handle = ACPI_HANDLE(ctlr->dev.parent); + if (!handle) + return; + + status = acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT, + SPI_ACPI_ENUMERATE_MAX_DEPTH, + acpi_spi_add_device, NULL, ctlr, NULL); + if (ACPI_FAILURE(status)) + dev_warn(&ctlr->dev, "failed to enumerate SPI slaves\n"); +} +#else +static inline void acpi_register_spi_devices(struct spi_controller *ctlr) {} +#endif /* CONFIG_ACPI */ + +static void spi_controller_release(struct device *dev) +{ + struct spi_controller *ctlr; + + ctlr = container_of(dev, struct spi_controller, dev); + kfree(ctlr); +} + +static struct class spi_master_class = { + .name = "spi_master", + .owner = THIS_MODULE, + .dev_release = spi_controller_release, + .dev_groups = spi_master_groups, +}; + +#ifdef CONFIG_SPI_SLAVE +/** + * spi_slave_abort - abort the ongoing transfer request on an SPI slave + * controller + * @spi: device used for the current transfer + */ +int spi_slave_abort(struct spi_device *spi) +{ + struct spi_controller *ctlr = spi->controller; + + if (spi_controller_is_slave(ctlr) && ctlr->slave_abort) + return ctlr->slave_abort(ctlr); + + return -ENOTSUPP; +} +EXPORT_SYMBOL_GPL(spi_slave_abort); + +static int match_true(struct device *dev, void *data) +{ + return 1; +} + +static ssize_t slave_show(struct device *dev, struct device_attribute *attr, + char *buf) +{ + struct spi_controller *ctlr = container_of(dev, struct spi_controller, + dev); + struct device *child; + + child = device_find_child(&ctlr->dev, NULL, match_true); + return sprintf(buf, "%s\n", + child ? to_spi_device(child)->modalias : NULL); +} + +static ssize_t slave_store(struct device *dev, struct device_attribute *attr, + const char *buf, size_t count) +{ + struct spi_controller *ctlr = container_of(dev, struct spi_controller, + dev); + struct spi_device *spi; + struct device *child; + char name[32]; + int rc; + + rc = sscanf(buf, "%31s", name); + if (rc != 1 || !name[0]) + return -EINVAL; + + child = device_find_child(&ctlr->dev, NULL, match_true); + if (child) { + /* Remove registered slave */ + device_unregister(child); + put_device(child); + } + + if (strcmp(name, "(null)")) { + /* Register new slave */ + spi = spi_alloc_device(ctlr); + if (!spi) + return -ENOMEM; + + strlcpy(spi->modalias, name, sizeof(spi->modalias)); + + rc = spi_add_device(spi); + if (rc) { + spi_dev_put(spi); + return rc; + } + } + + return count; +} + +static DEVICE_ATTR_RW(slave); + +static struct attribute *spi_slave_attrs[] = { + &dev_attr_slave.attr, + NULL, +}; + +static const struct attribute_group spi_slave_group = { + .attrs = spi_slave_attrs, +}; + +static const struct attribute_group *spi_slave_groups[] = { + &spi_controller_statistics_group, + &spi_slave_group, + NULL, +}; + +static struct class spi_slave_class = { + .name = "spi_slave", + .owner = THIS_MODULE, + .dev_release = spi_controller_release, + .dev_groups = spi_slave_groups, +}; +#else +extern struct class spi_slave_class; /* dummy */ +#endif + +/** + * __spi_alloc_controller - allocate an SPI master or slave controller + * @dev: the controller, possibly using the platform_bus + * @size: how much zeroed driver-private data to allocate; the pointer to this + * memory is in the driver_data field of the returned device, accessible + * with spi_controller_get_devdata(); the memory is cacheline aligned; + * drivers granting DMA access to portions of their private data need to + * round up @size using ALIGN(size, dma_get_cache_alignment()). + * @slave: flag indicating whether to allocate an SPI master (false) or SPI + * slave (true) controller + * Context: can sleep + * + * This call is used only by SPI controller drivers, which are the + * only ones directly touching chip registers. It's how they allocate + * an spi_controller structure, prior to calling spi_register_controller(). + * + * This must be called from context that can sleep. + * + * The caller is responsible for assigning the bus number and initializing the + * controller's methods before calling spi_register_controller(); and (after + * errors adding the device) calling spi_controller_put() to prevent a memory + * leak. + * + * Return: the SPI controller structure on success, else NULL. + */ +struct spi_controller *__spi_alloc_controller(struct device *dev, + unsigned int size, bool slave) +{ + struct spi_controller *ctlr; + size_t ctlr_size = ALIGN(sizeof(*ctlr), dma_get_cache_alignment()); + + if (!dev) + return NULL; + + ctlr = kzalloc(size + ctlr_size, GFP_KERNEL); + if (!ctlr) + return NULL; + + device_initialize(&ctlr->dev); + ctlr->bus_num = -1; + ctlr->num_chipselect = 1; + ctlr->slave = slave; + if (IS_ENABLED(CONFIG_SPI_SLAVE) && slave) + ctlr->dev.class = &spi_slave_class; + else + ctlr->dev.class = &spi_master_class; + ctlr->dev.parent = dev; + pm_suspend_ignore_children(&ctlr->dev, true); + spi_controller_set_devdata(ctlr, (void *)ctlr + ctlr_size); + + return ctlr; +} +EXPORT_SYMBOL_GPL(__spi_alloc_controller); + +static void devm_spi_release_controller(struct device *dev, void *ctlr) +{ + spi_controller_put(*(struct spi_controller **)ctlr); +} + +/** + * __devm_spi_alloc_controller - resource-managed __spi_alloc_controller() + * @dev: physical device of SPI controller + * @size: how much zeroed driver-private data to allocate + * @slave: whether to allocate an SPI master (false) or SPI slave (true) + * Context: can sleep + * + * Allocate an SPI controller and automatically release a reference on it + * when @dev is unbound from its driver. Drivers are thus relieved from + * having to call spi_controller_put(). + * + * The arguments to this function are identical to __spi_alloc_controller(). + * + * Return: the SPI controller structure on success, else NULL. + */ +struct spi_controller *__devm_spi_alloc_controller(struct device *dev, + unsigned int size, + bool slave) +{ + struct spi_controller **ptr, *ctlr; + + ptr = devres_alloc(devm_spi_release_controller, sizeof(*ptr), + GFP_KERNEL); + if (!ptr) + return NULL; + + ctlr = __spi_alloc_controller(dev, size, slave); + if (ctlr) { + ctlr->devm_allocated = true; + *ptr = ctlr; + devres_add(dev, ptr); + } else { + devres_free(ptr); + } + + return ctlr; +} +EXPORT_SYMBOL_GPL(__devm_spi_alloc_controller); + +#ifdef CONFIG_OF +static int of_spi_get_gpio_numbers(struct spi_controller *ctlr) +{ + int nb, i, *cs; + struct device_node *np = ctlr->dev.of_node; + + if (!np) + return 0; + + nb = of_gpio_named_count(np, "cs-gpios"); + ctlr->num_chipselect = max_t(int, nb, ctlr->num_chipselect); + + /* Return error only for an incorrectly formed cs-gpios property */ + if (nb == 0 || nb == -ENOENT) + return 0; + else if (nb < 0) + return nb; + + cs = devm_kcalloc(&ctlr->dev, ctlr->num_chipselect, sizeof(int), + GFP_KERNEL); + ctlr->cs_gpios = cs; + + if (!ctlr->cs_gpios) + return -ENOMEM; + + for (i = 0; i < ctlr->num_chipselect; i++) + cs[i] = -ENOENT; + + for (i = 0; i < nb; i++) + cs[i] = of_get_named_gpio(np, "cs-gpios", i); + + return 0; +} +#else +static int of_spi_get_gpio_numbers(struct spi_controller *ctlr) +{ + return 0; +} +#endif + +/** + * spi_get_gpio_descs() - grab chip select GPIOs for the master + * @ctlr: The SPI master to grab GPIO descriptors for + */ +static int spi_get_gpio_descs(struct spi_controller *ctlr) +{ + int nb, i; + struct gpio_desc **cs; + struct device *dev = &ctlr->dev; + unsigned long native_cs_mask = 0; + unsigned int num_cs_gpios = 0; + + nb = gpiod_count(dev, "cs"); + ctlr->num_chipselect = max_t(int, nb, ctlr->num_chipselect); + + /* No GPIOs at all is fine, else return the error */ + if (nb == 0 || nb == -ENOENT) + return 0; + else if (nb < 0) + return nb; + + cs = devm_kcalloc(dev, ctlr->num_chipselect, sizeof(*cs), + GFP_KERNEL); + if (!cs) + return -ENOMEM; + ctlr->cs_gpiods = cs; + + for (i = 0; i < nb; i++) { + /* + * Most chipselects are active low, the inverted + * semantics are handled by special quirks in gpiolib, + * so initializing them GPIOD_OUT_LOW here means + * "unasserted", in most cases this will drive the physical + * line high. + */ + cs[i] = devm_gpiod_get_index_optional(dev, "cs", i, + GPIOD_OUT_LOW); + if (IS_ERR(cs[i])) + return PTR_ERR(cs[i]); + + if (cs[i]) { + /* + * If we find a CS GPIO, name it after the device and + * chip select line. + */ + char *gpioname; + + gpioname = devm_kasprintf(dev, GFP_KERNEL, "%s CS%d", + dev_name(dev), i); + if (!gpioname) + return -ENOMEM; + gpiod_set_consumer_name(cs[i], gpioname); + num_cs_gpios++; + continue; + } + + if (ctlr->max_native_cs && i >= ctlr->max_native_cs) { + dev_err(dev, "Invalid native chip select %d\n", i); + return -EINVAL; + } + native_cs_mask |= BIT(i); + } + + ctlr->unused_native_cs = ffs(~native_cs_mask) - 1; + + if ((ctlr->flags & SPI_MASTER_GPIO_SS) && num_cs_gpios && + ctlr->max_native_cs && ctlr->unused_native_cs >= ctlr->max_native_cs) { + dev_err(dev, "No unused native chip select available\n"); + return -EINVAL; + } + + return 0; +} + +static int spi_controller_check_ops(struct spi_controller *ctlr) +{ + /* + * The controller may implement only the high-level SPI-memory like + * operations if it does not support regular SPI transfers, and this is + * valid use case. + * If ->mem_ops is NULL, we request that at least one of the + * ->transfer_xxx() method be implemented. + */ + if (ctlr->mem_ops) { + if (!ctlr->mem_ops->exec_op) + return -EINVAL; + } else if (!ctlr->transfer && !ctlr->transfer_one && + !ctlr->transfer_one_message) { + return -EINVAL; + } + + return 0; +} + +/** + * spi_register_controller - register SPI master or slave controller + * @ctlr: initialized master, originally from spi_alloc_master() or + * spi_alloc_slave() + * Context: can sleep + * + * SPI controllers connect to their drivers using some non-SPI bus, + * such as the platform bus. The final stage of probe() in that code + * includes calling spi_register_controller() to hook up to this SPI bus glue. + * + * SPI controllers use board specific (often SOC specific) bus numbers, + * and board-specific addressing for SPI devices combines those numbers + * with chip select numbers. Since SPI does not directly support dynamic + * device identification, boards need configuration tables telling which + * chip is at which address. + * + * This must be called from context that can sleep. It returns zero on + * success, else a negative error code (dropping the controller's refcount). + * After a successful return, the caller is responsible for calling + * spi_unregister_controller(). + * + * Return: zero on success, else a negative error code. + */ +int spi_register_controller(struct spi_controller *ctlr) +{ + struct device *dev = ctlr->dev.parent; + struct boardinfo *bi; + int status; + int id, first_dynamic; + + if (!dev) + return -ENODEV; + + /* + * Make sure all necessary hooks are implemented before registering + * the SPI controller. + */ + status = spi_controller_check_ops(ctlr); + if (status) + return status; + + if (ctlr->bus_num >= 0) { + /* devices with a fixed bus num must check-in with the num */ + mutex_lock(&board_lock); + id = idr_alloc(&spi_master_idr, ctlr, ctlr->bus_num, + ctlr->bus_num + 1, GFP_KERNEL); + mutex_unlock(&board_lock); + if (WARN(id < 0, "couldn't get idr")) + return id == -ENOSPC ? -EBUSY : id; + ctlr->bus_num = id; + } else if (ctlr->dev.of_node) { + /* allocate dynamic bus number using Linux idr */ + id = of_alias_get_id(ctlr->dev.of_node, "spi"); + if (id >= 0) { + ctlr->bus_num = id; + mutex_lock(&board_lock); + id = idr_alloc(&spi_master_idr, ctlr, ctlr->bus_num, + ctlr->bus_num + 1, GFP_KERNEL); + mutex_unlock(&board_lock); + if (WARN(id < 0, "couldn't get idr")) + return id == -ENOSPC ? -EBUSY : id; + } + } + if (ctlr->bus_num < 0) { + first_dynamic = of_alias_get_highest_id("spi"); + if (first_dynamic < 0) + first_dynamic = 0; + else + first_dynamic++; + + mutex_lock(&board_lock); + id = idr_alloc(&spi_master_idr, ctlr, first_dynamic, + 0, GFP_KERNEL); + mutex_unlock(&board_lock); + if (WARN(id < 0, "couldn't get idr")) + return id; + ctlr->bus_num = id; + } + INIT_LIST_HEAD(&ctlr->queue); + spin_lock_init(&ctlr->queue_lock); + spin_lock_init(&ctlr->bus_lock_spinlock); + mutex_init(&ctlr->bus_lock_mutex); + mutex_init(&ctlr->io_mutex); + ctlr->bus_lock_flag = 0; + init_completion(&ctlr->xfer_completion); + if (!ctlr->max_dma_len) + ctlr->max_dma_len = INT_MAX; + + /* register the device, then userspace will see it. + * registration fails if the bus ID is in use. + */ + dev_set_name(&ctlr->dev, "spi%u", ctlr->bus_num); + + if (!spi_controller_is_slave(ctlr)) { + if (ctlr->use_gpio_descriptors) { + status = spi_get_gpio_descs(ctlr); + if (status) + goto free_bus_id; + /* + * A controller using GPIO descriptors always + * supports SPI_CS_HIGH if need be. + */ + ctlr->mode_bits |= SPI_CS_HIGH; + } else { + /* Legacy code path for GPIOs from DT */ + status = of_spi_get_gpio_numbers(ctlr); + if (status) + goto free_bus_id; + } + } + + /* + * Even if it's just one always-selected device, there must + * be at least one chipselect. + */ + if (!ctlr->num_chipselect) { + status = -EINVAL; + goto free_bus_id; + } + + status = device_add(&ctlr->dev); + if (status < 0) + goto free_bus_id; + dev_dbg(dev, "registered %s %s\n", + spi_controller_is_slave(ctlr) ? "slave" : "master", + dev_name(&ctlr->dev)); + + /* + * If we're using a queued driver, start the queue. Note that we don't + * need the queueing logic if the driver is only supporting high-level + * memory operations. + */ + if (ctlr->transfer) { + dev_info(dev, "controller is unqueued, this is deprecated\n"); + } else if (ctlr->transfer_one || ctlr->transfer_one_message) { + status = spi_controller_initialize_queue(ctlr); + if (status) { + device_del(&ctlr->dev); + goto free_bus_id; + } + } + /* add statistics */ + spin_lock_init(&ctlr->statistics.lock); + + mutex_lock(&board_lock); + list_add_tail(&ctlr->list, &spi_controller_list); + list_for_each_entry(bi, &board_list, list) + spi_match_controller_to_boardinfo(ctlr, &bi->board_info); + mutex_unlock(&board_lock); + + /* Register devices from the device tree and ACPI */ + of_register_spi_devices(ctlr); + acpi_register_spi_devices(ctlr); + return status; + +free_bus_id: + mutex_lock(&board_lock); + idr_remove(&spi_master_idr, ctlr->bus_num); + mutex_unlock(&board_lock); + return status; +} +EXPORT_SYMBOL_GPL(spi_register_controller); + +static void devm_spi_unregister(struct device *dev, void *res) +{ + spi_unregister_controller(*(struct spi_controller **)res); +} + +/** + * devm_spi_register_controller - register managed SPI master or slave + * controller + * @dev: device managing SPI controller + * @ctlr: initialized controller, originally from spi_alloc_master() or + * spi_alloc_slave() + * Context: can sleep + * + * Register a SPI device as with spi_register_controller() which will + * automatically be unregistered and freed. + * + * Return: zero on success, else a negative error code. + */ +int devm_spi_register_controller(struct device *dev, + struct spi_controller *ctlr) +{ + struct spi_controller **ptr; + int ret; + + ptr = devres_alloc(devm_spi_unregister, sizeof(*ptr), GFP_KERNEL); + if (!ptr) + return -ENOMEM; + + ret = spi_register_controller(ctlr); + if (!ret) { + *ptr = ctlr; + devres_add(dev, ptr); + } else { + devres_free(ptr); + } + + return ret; +} +EXPORT_SYMBOL_GPL(devm_spi_register_controller); + +static int __unregister(struct device *dev, void *null) +{ + spi_unregister_device(to_spi_device(dev)); + return 0; +} + +/** + * spi_unregister_controller - unregister SPI master or slave controller + * @ctlr: the controller being unregistered + * Context: can sleep + * + * This call is used only by SPI controller drivers, which are the + * only ones directly touching chip registers. + * + * This must be called from context that can sleep. + * + * Note that this function also drops a reference to the controller. + */ +void spi_unregister_controller(struct spi_controller *ctlr) +{ + struct spi_controller *found; + int id = ctlr->bus_num; + + /* Prevent addition of new devices, unregister existing ones */ + if (IS_ENABLED(CONFIG_SPI_DYNAMIC)) + mutex_lock(&spi_add_lock); + + device_for_each_child(&ctlr->dev, NULL, __unregister); + + /* First make sure that this controller was ever added */ + mutex_lock(&board_lock); + found = idr_find(&spi_master_idr, id); + mutex_unlock(&board_lock); + if (ctlr->queued) { + if (spi_destroy_queue(ctlr)) + dev_err(&ctlr->dev, "queue remove failed\n"); + } + mutex_lock(&board_lock); + list_del(&ctlr->list); + mutex_unlock(&board_lock); + + device_del(&ctlr->dev); + + /* Release the last reference on the controller if its driver + * has not yet been converted to devm_spi_alloc_master/slave(). + */ + if (!ctlr->devm_allocated) + put_device(&ctlr->dev); + + /* free bus id */ + mutex_lock(&board_lock); + if (found == ctlr) + idr_remove(&spi_master_idr, id); + mutex_unlock(&board_lock); + + if (IS_ENABLED(CONFIG_SPI_DYNAMIC)) + mutex_unlock(&spi_add_lock); +} +EXPORT_SYMBOL_GPL(spi_unregister_controller); + +int spi_controller_suspend(struct spi_controller *ctlr) +{ + int ret; + + /* Basically no-ops for non-queued controllers */ + if (!ctlr->queued) + return 0; + + ret = spi_stop_queue(ctlr); + if (ret) + dev_err(&ctlr->dev, "queue stop failed\n"); + + return ret; +} +EXPORT_SYMBOL_GPL(spi_controller_suspend); + +int spi_controller_resume(struct spi_controller *ctlr) +{ + int ret; + + if (!ctlr->queued) + return 0; + + ret = spi_start_queue(ctlr); + if (ret) + dev_err(&ctlr->dev, "queue restart failed\n"); + + return ret; +} +EXPORT_SYMBOL_GPL(spi_controller_resume); + +static int __spi_controller_match(struct device *dev, const void *data) +{ + struct spi_controller *ctlr; + const u16 *bus_num = data; + + ctlr = container_of(dev, struct spi_controller, dev); + return ctlr->bus_num == *bus_num; +} + +/** + * spi_busnum_to_master - look up master associated with bus_num + * @bus_num: the master's bus number + * Context: can sleep + * + * This call may be used with devices that are registered after + * arch init time. It returns a refcounted pointer to the relevant + * spi_controller (which the caller must release), or NULL if there is + * no such master registered. + * + * Return: the SPI master structure on success, else NULL. + */ +struct spi_controller *spi_busnum_to_master(u16 bus_num) +{ + struct device *dev; + struct spi_controller *ctlr = NULL; + + dev = class_find_device(&spi_master_class, NULL, &bus_num, + __spi_controller_match); + if (dev) + ctlr = container_of(dev, struct spi_controller, dev); + /* reference got in class_find_device */ + return ctlr; +} +EXPORT_SYMBOL_GPL(spi_busnum_to_master); + +/*-------------------------------------------------------------------------*/ + +/* Core methods for SPI resource management */ + +/** + * spi_res_alloc - allocate a spi resource that is life-cycle managed + * during the processing of a spi_message while using + * spi_transfer_one + * @spi: the spi device for which we allocate memory + * @release: the release code to execute for this resource + * @size: size to alloc and return + * @gfp: GFP allocation flags + * + * Return: the pointer to the allocated data + * + * This may get enhanced in the future to allocate from a memory pool + * of the @spi_device or @spi_controller to avoid repeated allocations. + */ +void *spi_res_alloc(struct spi_device *spi, + spi_res_release_t release, + size_t size, gfp_t gfp) +{ + struct spi_res *sres; + + sres = kzalloc(sizeof(*sres) + size, gfp); + if (!sres) + return NULL; + + INIT_LIST_HEAD(&sres->entry); + sres->release = release; + + return sres->data; +} +EXPORT_SYMBOL_GPL(spi_res_alloc); + +/** + * spi_res_free - free an spi resource + * @res: pointer to the custom data of a resource + * + */ +void spi_res_free(void *res) +{ + struct spi_res *sres = container_of(res, struct spi_res, data); + + if (!res) + return; + + WARN_ON(!list_empty(&sres->entry)); + kfree(sres); +} +EXPORT_SYMBOL_GPL(spi_res_free); + +/** + * spi_res_add - add a spi_res to the spi_message + * @message: the spi message + * @res: the spi_resource + */ +void spi_res_add(struct spi_message *message, void *res) +{ + struct spi_res *sres = container_of(res, struct spi_res, data); + + WARN_ON(!list_empty(&sres->entry)); + list_add_tail(&sres->entry, &message->resources); +} +EXPORT_SYMBOL_GPL(spi_res_add); + +/** + * spi_res_release - release all spi resources for this message + * @ctlr: the @spi_controller + * @message: the @spi_message + */ +void spi_res_release(struct spi_controller *ctlr, struct spi_message *message) +{ + struct spi_res *res, *tmp; + + list_for_each_entry_safe_reverse(res, tmp, &message->resources, entry) { + if (res->release) + res->release(ctlr, message, res->data); + + list_del(&res->entry); + + kfree(res); + } +} +EXPORT_SYMBOL_GPL(spi_res_release); + +/*-------------------------------------------------------------------------*/ + +/* Core methods for spi_message alterations */ + +static void __spi_replace_transfers_release(struct spi_controller *ctlr, + struct spi_message *msg, + void *res) +{ + struct spi_replaced_transfers *rxfer = res; + size_t i; + + /* call extra callback if requested */ + if (rxfer->release) + rxfer->release(ctlr, msg, res); + + /* insert replaced transfers back into the message */ + list_splice(&rxfer->replaced_transfers, rxfer->replaced_after); + + /* remove the formerly inserted entries */ + for (i = 0; i < rxfer->inserted; i++) + list_del(&rxfer->inserted_transfers[i].transfer_list); +} + +/** + * spi_replace_transfers - replace transfers with several transfers + * and register change with spi_message.resources + * @msg: the spi_message we work upon + * @xfer_first: the first spi_transfer we want to replace + * @remove: number of transfers to remove + * @insert: the number of transfers we want to insert instead + * @release: extra release code necessary in some circumstances + * @extradatasize: extra data to allocate (with alignment guarantees + * of struct @spi_transfer) + * @gfp: gfp flags + * + * Returns: pointer to @spi_replaced_transfers, + * PTR_ERR(...) in case of errors. + */ +struct spi_replaced_transfers *spi_replace_transfers( + struct spi_message *msg, + struct spi_transfer *xfer_first, + size_t remove, + size_t insert, + spi_replaced_release_t release, + size_t extradatasize, + gfp_t gfp) +{ + struct spi_replaced_transfers *rxfer; + struct spi_transfer *xfer; + size_t i; + + /* allocate the structure using spi_res */ + rxfer = spi_res_alloc(msg->spi, __spi_replace_transfers_release, + struct_size(rxfer, inserted_transfers, insert) + + extradatasize, + gfp); + if (!rxfer) + return ERR_PTR(-ENOMEM); + + /* the release code to invoke before running the generic release */ + rxfer->release = release; + + /* assign extradata */ + if (extradatasize) + rxfer->extradata = + &rxfer->inserted_transfers[insert]; + + /* init the replaced_transfers list */ + INIT_LIST_HEAD(&rxfer->replaced_transfers); + + /* assign the list_entry after which we should reinsert + * the @replaced_transfers - it may be spi_message.messages! + */ + rxfer->replaced_after = xfer_first->transfer_list.prev; + + /* remove the requested number of transfers */ + for (i = 0; i < remove; i++) { + /* if the entry after replaced_after it is msg->transfers + * then we have been requested to remove more transfers + * than are in the list + */ + if (rxfer->replaced_after->next == &msg->transfers) { + dev_err(&msg->spi->dev, + "requested to remove more spi_transfers than are available\n"); + /* insert replaced transfers back into the message */ + list_splice(&rxfer->replaced_transfers, + rxfer->replaced_after); + + /* free the spi_replace_transfer structure */ + spi_res_free(rxfer); + + /* and return with an error */ + return ERR_PTR(-EINVAL); + } + + /* remove the entry after replaced_after from list of + * transfers and add it to list of replaced_transfers + */ + list_move_tail(rxfer->replaced_after->next, + &rxfer->replaced_transfers); + } + + /* create copy of the given xfer with identical settings + * based on the first transfer to get removed + */ + for (i = 0; i < insert; i++) { + /* we need to run in reverse order */ + xfer = &rxfer->inserted_transfers[insert - 1 - i]; + + /* copy all spi_transfer data */ + memcpy(xfer, xfer_first, sizeof(*xfer)); + + /* add to list */ + list_add(&xfer->transfer_list, rxfer->replaced_after); + + /* clear cs_change and delay for all but the last */ + if (i) { + xfer->cs_change = false; + xfer->delay_usecs = 0; + xfer->delay.value = 0; + } + } + + /* set up inserted */ + rxfer->inserted = insert; + + /* and register it with spi_res/spi_message */ + spi_res_add(msg, rxfer); + + return rxfer; +} +EXPORT_SYMBOL_GPL(spi_replace_transfers); + +static int __spi_split_transfer_maxsize(struct spi_controller *ctlr, + struct spi_message *msg, + struct spi_transfer **xferp, + size_t maxsize, + gfp_t gfp) +{ + struct spi_transfer *xfer = *xferp, *xfers; + struct spi_replaced_transfers *srt; + size_t offset; + size_t count, i; + + /* calculate how many we have to replace */ + count = DIV_ROUND_UP(xfer->len, maxsize); + + /* create replacement */ + srt = spi_replace_transfers(msg, xfer, 1, count, NULL, 0, gfp); + if (IS_ERR(srt)) + return PTR_ERR(srt); + xfers = srt->inserted_transfers; + + /* now handle each of those newly inserted spi_transfers + * note that the replacements spi_transfers all are preset + * to the same values as *xferp, so tx_buf, rx_buf and len + * are all identical (as well as most others) + * so we just have to fix up len and the pointers. + * + * this also includes support for the depreciated + * spi_message.is_dma_mapped interface + */ + + /* the first transfer just needs the length modified, so we + * run it outside the loop + */ + xfers[0].len = min_t(size_t, maxsize, xfer[0].len); + + /* all the others need rx_buf/tx_buf also set */ + for (i = 1, offset = maxsize; i < count; offset += maxsize, i++) { + /* update rx_buf, tx_buf and dma */ + if (xfers[i].rx_buf) + xfers[i].rx_buf += offset; + if (xfers[i].rx_dma) + xfers[i].rx_dma += offset; + if (xfers[i].tx_buf) + xfers[i].tx_buf += offset; + if (xfers[i].tx_dma) + xfers[i].tx_dma += offset; + + /* update length */ + xfers[i].len = min(maxsize, xfers[i].len - offset); + } + + /* we set up xferp to the last entry we have inserted, + * so that we skip those already split transfers + */ + *xferp = &xfers[count - 1]; + + /* increment statistics counters */ + SPI_STATISTICS_INCREMENT_FIELD(&ctlr->statistics, + transfers_split_maxsize); + SPI_STATISTICS_INCREMENT_FIELD(&msg->spi->statistics, + transfers_split_maxsize); + + return 0; +} + +/** + * spi_split_tranfers_maxsize - split spi transfers into multiple transfers + * when an individual transfer exceeds a + * certain size + * @ctlr: the @spi_controller for this transfer + * @msg: the @spi_message to transform + * @maxsize: the maximum when to apply this + * @gfp: GFP allocation flags + * + * Return: status of transformation + */ +int spi_split_transfers_maxsize(struct spi_controller *ctlr, + struct spi_message *msg, + size_t maxsize, + gfp_t gfp) +{ + struct spi_transfer *xfer; + int ret; + + /* iterate over the transfer_list, + * but note that xfer is advanced to the last transfer inserted + * to avoid checking sizes again unnecessarily (also xfer does + * potentiall belong to a different list by the time the + * replacement has happened + */ + list_for_each_entry(xfer, &msg->transfers, transfer_list) { + if (xfer->len > maxsize) { + ret = __spi_split_transfer_maxsize(ctlr, msg, &xfer, + maxsize, gfp); + if (ret) + return ret; + } + } + + return 0; +} +EXPORT_SYMBOL_GPL(spi_split_transfers_maxsize); + +/*-------------------------------------------------------------------------*/ + +/* Core methods for SPI controller protocol drivers. Some of the + * other core methods are currently defined as inline functions. + */ + +static int __spi_validate_bits_per_word(struct spi_controller *ctlr, + u8 bits_per_word) +{ + if (ctlr->bits_per_word_mask) { + /* Only 32 bits fit in the mask */ + if (bits_per_word > 32) + return -EINVAL; + if (!(ctlr->bits_per_word_mask & SPI_BPW_MASK(bits_per_word))) + return -EINVAL; + } + + return 0; +} + +/** + * spi_setup - setup SPI mode and clock rate + * @spi: the device whose settings are being modified + * Context: can sleep, and no requests are queued to the device + * + * SPI protocol drivers may need to update the transfer mode if the + * device doesn't work with its default. They may likewise need + * to update clock rates or word sizes from initial values. This function + * changes those settings, and must be called from a context that can sleep. + * Except for SPI_CS_HIGH, which takes effect immediately, the changes take + * effect the next time the device is selected and data is transferred to + * or from it. When this function returns, the spi device is deselected. + * + * Note that this call will fail if the protocol driver specifies an option + * that the underlying controller or its driver does not support. For + * example, not all hardware supports wire transfers using nine bit words, + * LSB-first wire encoding, or active-high chipselects. + * + * Return: zero on success, else a negative error code. + */ +int spi_setup(struct spi_device *spi) +{ + unsigned bad_bits, ugly_bits; + int status; + + /* check mode to prevent that DUAL and QUAD set at the same time + */ + if (((spi->mode & SPI_TX_DUAL) && (spi->mode & SPI_TX_QUAD)) || + ((spi->mode & SPI_RX_DUAL) && (spi->mode & SPI_RX_QUAD))) { + dev_err(&spi->dev, + "setup: can not select dual and quad at the same time\n"); + return -EINVAL; + } + /* if it is SPI_3WIRE mode, DUAL and QUAD should be forbidden + */ + if ((spi->mode & SPI_3WIRE) && (spi->mode & + (SPI_TX_DUAL | SPI_TX_QUAD | SPI_TX_OCTAL | + SPI_RX_DUAL | SPI_RX_QUAD | SPI_RX_OCTAL))) + return -EINVAL; + /* help drivers fail *cleanly* when they need options + * that aren't supported with their current controller + * SPI_CS_WORD has a fallback software implementation, + * so it is ignored here. + */ + bad_bits = spi->mode & ~(spi->controller->mode_bits | SPI_CS_WORD); + /* nothing prevents from working with active-high CS in case if it + * is driven by GPIO. + */ + if (gpio_is_valid(spi->cs_gpio)) + bad_bits &= ~SPI_CS_HIGH; + ugly_bits = bad_bits & + (SPI_TX_DUAL | SPI_TX_QUAD | SPI_TX_OCTAL | + SPI_RX_DUAL | SPI_RX_QUAD | SPI_RX_OCTAL); + if (ugly_bits) { + dev_warn(&spi->dev, + "setup: ignoring unsupported mode bits %x\n", + ugly_bits); + spi->mode &= ~ugly_bits; + bad_bits &= ~ugly_bits; + } + if (bad_bits) { + dev_err(&spi->dev, "setup: unsupported mode bits %x\n", + bad_bits); + return -EINVAL; + } + + if (!spi->bits_per_word) + spi->bits_per_word = 8; + + status = __spi_validate_bits_per_word(spi->controller, + spi->bits_per_word); + if (status) + return status; + + if (!spi->max_speed_hz) + spi->max_speed_hz = spi->controller->max_speed_hz; + + mutex_lock(&spi->controller->io_mutex); + + if (spi->controller->setup) + status = spi->controller->setup(spi); + + if (spi->controller->auto_runtime_pm && spi->controller->set_cs) { + status = pm_runtime_get_sync(spi->controller->dev.parent); + if (status < 0) { + mutex_unlock(&spi->controller->io_mutex); + pm_runtime_put_noidle(spi->controller->dev.parent); + dev_err(&spi->controller->dev, "Failed to power device: %d\n", + status); + return status; + } + + /* + * We do not want to return positive value from pm_runtime_get, + * there are many instances of devices calling spi_setup() and + * checking for a non-zero return value instead of a negative + * return value. + */ + status = 0; + + spi_set_cs(spi, false, true); + pm_runtime_mark_last_busy(spi->controller->dev.parent); + pm_runtime_put_autosuspend(spi->controller->dev.parent); + } else { + spi_set_cs(spi, false, true); + } + + mutex_unlock(&spi->controller->io_mutex); + + if (spi->rt && !spi->controller->rt) { + spi->controller->rt = true; + spi_set_thread_rt(spi->controller); + } + + dev_dbg(&spi->dev, "setup mode %d, %s%s%s%s%u bits/w, %u Hz max --> %d\n", + (int) (spi->mode & (SPI_CPOL | SPI_CPHA)), + (spi->mode & SPI_CS_HIGH) ? "cs_high, " : "", + (spi->mode & SPI_LSB_FIRST) ? "lsb, " : "", + (spi->mode & SPI_3WIRE) ? "3wire, " : "", + (spi->mode & SPI_LOOP) ? "loopback, " : "", + spi->bits_per_word, spi->max_speed_hz, + status); + + return status; +} +EXPORT_SYMBOL_GPL(spi_setup); + +/** + * spi_set_cs_timing - configure CS setup, hold, and inactive delays + * @spi: the device that requires specific CS timing configuration + * @setup: CS setup time specified via @spi_delay + * @hold: CS hold time specified via @spi_delay + * @inactive: CS inactive delay between transfers specified via @spi_delay + * + * Return: zero on success, else a negative error code. + */ +int spi_set_cs_timing(struct spi_device *spi, struct spi_delay *setup, + struct spi_delay *hold, struct spi_delay *inactive) +{ + size_t len; + + if (spi->controller->set_cs_timing) + return spi->controller->set_cs_timing(spi, setup, hold, + inactive); + + if ((setup && setup->unit == SPI_DELAY_UNIT_SCK) || + (hold && hold->unit == SPI_DELAY_UNIT_SCK) || + (inactive && inactive->unit == SPI_DELAY_UNIT_SCK)) { + dev_err(&spi->dev, + "Clock-cycle delays for CS not supported in SW mode\n"); + return -ENOTSUPP; + } + + len = sizeof(struct spi_delay); + + /* copy delays to controller */ + if (setup) + memcpy(&spi->controller->cs_setup, setup, len); + else + memset(&spi->controller->cs_setup, 0, len); + + if (hold) + memcpy(&spi->controller->cs_hold, hold, len); + else + memset(&spi->controller->cs_hold, 0, len); + + if (inactive) + memcpy(&spi->controller->cs_inactive, inactive, len); + else + memset(&spi->controller->cs_inactive, 0, len); + + return 0; +} +EXPORT_SYMBOL_GPL(spi_set_cs_timing); + +static int _spi_xfer_word_delay_update(struct spi_transfer *xfer, + struct spi_device *spi) +{ + int delay1, delay2; + + delay1 = spi_delay_to_ns(&xfer->word_delay, xfer); + if (delay1 < 0) + return delay1; + + delay2 = spi_delay_to_ns(&spi->word_delay, xfer); + if (delay2 < 0) + return delay2; + + if (delay1 < delay2) + memcpy(&xfer->word_delay, &spi->word_delay, + sizeof(xfer->word_delay)); + + return 0; +} + +static int __spi_validate(struct spi_device *spi, struct spi_message *message) +{ + struct spi_controller *ctlr = spi->controller; + struct spi_transfer *xfer; + int w_size; + + if (list_empty(&message->transfers)) + return -EINVAL; + + /* If an SPI controller does not support toggling the CS line on each + * transfer (indicated by the SPI_CS_WORD flag) or we are using a GPIO + * for the CS line, we can emulate the CS-per-word hardware function by + * splitting transfers into one-word transfers and ensuring that + * cs_change is set for each transfer. + */ + if ((spi->mode & SPI_CS_WORD) && (!(ctlr->mode_bits & SPI_CS_WORD) || + spi->cs_gpiod || + gpio_is_valid(spi->cs_gpio))) { + size_t maxsize; + int ret; + + maxsize = (spi->bits_per_word + 7) / 8; + + /* spi_split_transfers_maxsize() requires message->spi */ + message->spi = spi; + + ret = spi_split_transfers_maxsize(ctlr, message, maxsize, + GFP_KERNEL); + if (ret) + return ret; + + list_for_each_entry(xfer, &message->transfers, transfer_list) { + /* don't change cs_change on the last entry in the list */ + if (list_is_last(&xfer->transfer_list, &message->transfers)) + break; + xfer->cs_change = 1; + } + } + + /* Half-duplex links include original MicroWire, and ones with + * only one data pin like SPI_3WIRE (switches direction) or where + * either MOSI or MISO is missing. They can also be caused by + * software limitations. + */ + if ((ctlr->flags & SPI_CONTROLLER_HALF_DUPLEX) || + (spi->mode & SPI_3WIRE)) { + unsigned flags = ctlr->flags; + + list_for_each_entry(xfer, &message->transfers, transfer_list) { + if (xfer->rx_buf && xfer->tx_buf) + return -EINVAL; + if ((flags & SPI_CONTROLLER_NO_TX) && xfer->tx_buf) + return -EINVAL; + if ((flags & SPI_CONTROLLER_NO_RX) && xfer->rx_buf) + return -EINVAL; + } + } + + /** + * Set transfer bits_per_word and max speed as spi device default if + * it is not set for this transfer. + * Set transfer tx_nbits and rx_nbits as single transfer default + * (SPI_NBITS_SINGLE) if it is not set for this transfer. + * Ensure transfer word_delay is at least as long as that required by + * device itself. + */ + message->frame_length = 0; + list_for_each_entry(xfer, &message->transfers, transfer_list) { + xfer->effective_speed_hz = 0; + message->frame_length += xfer->len; + if (!xfer->bits_per_word) + xfer->bits_per_word = spi->bits_per_word; + + if (!xfer->speed_hz) + xfer->speed_hz = spi->max_speed_hz; + + if (ctlr->max_speed_hz && xfer->speed_hz > ctlr->max_speed_hz) + xfer->speed_hz = ctlr->max_speed_hz; + + if (__spi_validate_bits_per_word(ctlr, xfer->bits_per_word)) + return -EINVAL; + + /* + * SPI transfer length should be multiple of SPI word size + * where SPI word size should be power-of-two multiple + */ + if (xfer->bits_per_word <= 8) + w_size = 1; + else if (xfer->bits_per_word <= 16) + w_size = 2; + else + w_size = 4; + + /* No partial transfers accepted */ + if (xfer->len % w_size) + return -EINVAL; + + if (xfer->speed_hz && ctlr->min_speed_hz && + xfer->speed_hz < ctlr->min_speed_hz) + return -EINVAL; + + if (xfer->tx_buf && !xfer->tx_nbits) + xfer->tx_nbits = SPI_NBITS_SINGLE; + if (xfer->rx_buf && !xfer->rx_nbits) + xfer->rx_nbits = SPI_NBITS_SINGLE; + /* check transfer tx/rx_nbits: + * 1. check the value matches one of single, dual and quad + * 2. check tx/rx_nbits match the mode in spi_device + */ + if (xfer->tx_buf) { + if (xfer->tx_nbits != SPI_NBITS_SINGLE && + xfer->tx_nbits != SPI_NBITS_DUAL && + xfer->tx_nbits != SPI_NBITS_QUAD) + return -EINVAL; + if ((xfer->tx_nbits == SPI_NBITS_DUAL) && + !(spi->mode & (SPI_TX_DUAL | SPI_TX_QUAD))) + return -EINVAL; + if ((xfer->tx_nbits == SPI_NBITS_QUAD) && + !(spi->mode & SPI_TX_QUAD)) + return -EINVAL; + } + /* check transfer rx_nbits */ + if (xfer->rx_buf) { + if (xfer->rx_nbits != SPI_NBITS_SINGLE && + xfer->rx_nbits != SPI_NBITS_DUAL && + xfer->rx_nbits != SPI_NBITS_QUAD) + return -EINVAL; + if ((xfer->rx_nbits == SPI_NBITS_DUAL) && + !(spi->mode & (SPI_RX_DUAL | SPI_RX_QUAD))) + return -EINVAL; + if ((xfer->rx_nbits == SPI_NBITS_QUAD) && + !(spi->mode & SPI_RX_QUAD)) + return -EINVAL; + } + + if (_spi_xfer_word_delay_update(xfer, spi)) + return -EINVAL; + } + + message->status = -EINPROGRESS; + + return 0; +} + +static int __spi_async(struct spi_device *spi, struct spi_message *message) +{ + struct spi_controller *ctlr = spi->controller; + struct spi_transfer *xfer; + + /* + * Some controllers do not support doing regular SPI transfers. Return + * ENOTSUPP when this is the case. + */ + if (!ctlr->transfer) + return -ENOTSUPP; + + message->spi = spi; + + SPI_STATISTICS_INCREMENT_FIELD(&ctlr->statistics, spi_async); + SPI_STATISTICS_INCREMENT_FIELD(&spi->statistics, spi_async); + + trace_spi_message_submit(message); + + if (!ctlr->ptp_sts_supported) { + list_for_each_entry(xfer, &message->transfers, transfer_list) { + xfer->ptp_sts_word_pre = 0; + ptp_read_system_prets(xfer->ptp_sts); + } + } + + return ctlr->transfer(spi, message); +} + +/** + * spi_async - asynchronous SPI transfer + * @spi: device with which data will be exchanged + * @message: describes the data transfers, including completion callback + * Context: any (irqs may be blocked, etc) + * + * This call may be used in_irq and other contexts which can't sleep, + * as well as from task contexts which can sleep. + * + * The completion callback is invoked in a context which can't sleep. + * Before that invocation, the value of message->status is undefined. + * When the callback is issued, message->status holds either zero (to + * indicate complete success) or a negative error code. After that + * callback returns, the driver which issued the transfer request may + * deallocate the associated memory; it's no longer in use by any SPI + * core or controller driver code. + * + * Note that although all messages to a spi_device are handled in + * FIFO order, messages may go to different devices in other orders. + * Some device might be higher priority, or have various "hard" access + * time requirements, for example. + * + * On detection of any fault during the transfer, processing of + * the entire message is aborted, and the device is deselected. + * Until returning from the associated message completion callback, + * no other spi_message queued to that device will be processed. + * (This rule applies equally to all the synchronous transfer calls, + * which are wrappers around this core asynchronous primitive.) + * + * Return: zero on success, else a negative error code. + */ +int spi_async(struct spi_device *spi, struct spi_message *message) +{ + struct spi_controller *ctlr = spi->controller; + int ret; + unsigned long flags; + + ret = __spi_validate(spi, message); + if (ret != 0) + return ret; + + spin_lock_irqsave(&ctlr->bus_lock_spinlock, flags); + + if (ctlr->bus_lock_flag) + ret = -EBUSY; + else + ret = __spi_async(spi, message); + + spin_unlock_irqrestore(&ctlr->bus_lock_spinlock, flags); + + return ret; +} +EXPORT_SYMBOL_GPL(spi_async); + +/** + * spi_async_locked - version of spi_async with exclusive bus usage + * @spi: device with which data will be exchanged + * @message: describes the data transfers, including completion callback + * Context: any (irqs may be blocked, etc) + * + * This call may be used in_irq and other contexts which can't sleep, + * as well as from task contexts which can sleep. + * + * The completion callback is invoked in a context which can't sleep. + * Before that invocation, the value of message->status is undefined. + * When the callback is issued, message->status holds either zero (to + * indicate complete success) or a negative error code. After that + * callback returns, the driver which issued the transfer request may + * deallocate the associated memory; it's no longer in use by any SPI + * core or controller driver code. + * + * Note that although all messages to a spi_device are handled in + * FIFO order, messages may go to different devices in other orders. + * Some device might be higher priority, or have various "hard" access + * time requirements, for example. + * + * On detection of any fault during the transfer, processing of + * the entire message is aborted, and the device is deselected. + * Until returning from the associated message completion callback, + * no other spi_message queued to that device will be processed. + * (This rule applies equally to all the synchronous transfer calls, + * which are wrappers around this core asynchronous primitive.) + * + * Return: zero on success, else a negative error code. + */ +int spi_async_locked(struct spi_device *spi, struct spi_message *message) +{ + struct spi_controller *ctlr = spi->controller; + int ret; + unsigned long flags; + + ret = __spi_validate(spi, message); + if (ret != 0) + return ret; + + spin_lock_irqsave(&ctlr->bus_lock_spinlock, flags); + + ret = __spi_async(spi, message); + + spin_unlock_irqrestore(&ctlr->bus_lock_spinlock, flags); + + return ret; + +} +EXPORT_SYMBOL_GPL(spi_async_locked); + +/*-------------------------------------------------------------------------*/ + +/* Utility methods for SPI protocol drivers, layered on + * top of the core. Some other utility methods are defined as + * inline functions. + */ + +static void spi_complete(void *arg) +{ + complete(arg); +} + +static int __spi_sync(struct spi_device *spi, struct spi_message *message) +{ + DECLARE_COMPLETION_ONSTACK(done); + int status; + struct spi_controller *ctlr = spi->controller; + unsigned long flags; + + status = __spi_validate(spi, message); + if (status != 0) + return status; + + message->complete = spi_complete; + message->context = &done; + message->spi = spi; + + SPI_STATISTICS_INCREMENT_FIELD(&ctlr->statistics, spi_sync); + SPI_STATISTICS_INCREMENT_FIELD(&spi->statistics, spi_sync); + + /* If we're not using the legacy transfer method then we will + * try to transfer in the calling context so special case. + * This code would be less tricky if we could remove the + * support for driver implemented message queues. + */ + if (ctlr->transfer == spi_queued_transfer) { + spin_lock_irqsave(&ctlr->bus_lock_spinlock, flags); + + trace_spi_message_submit(message); + + status = __spi_queued_transfer(spi, message, false); + + spin_unlock_irqrestore(&ctlr->bus_lock_spinlock, flags); + } else { + status = spi_async_locked(spi, message); + } + + if (status == 0) { + /* Push out the messages in the calling context if we + * can. + */ + if (ctlr->transfer == spi_queued_transfer) { + SPI_STATISTICS_INCREMENT_FIELD(&ctlr->statistics, + spi_sync_immediate); + SPI_STATISTICS_INCREMENT_FIELD(&spi->statistics, + spi_sync_immediate); + __spi_pump_messages(ctlr, false); + } + + wait_for_completion(&done); + status = message->status; + } + message->context = NULL; + return status; +} + +/** + * spi_sync - blocking/synchronous SPI data transfers + * @spi: device with which data will be exchanged + * @message: describes the data transfers + * Context: can sleep + * + * This call may only be used from a context that may sleep. The sleep + * is non-interruptible, and has no timeout. Low-overhead controller + * drivers may DMA directly into and out of the message buffers. + * + * Note that the SPI device's chip select is active during the message, + * and then is normally disabled between messages. Drivers for some + * frequently-used devices may want to minimize costs of selecting a chip, + * by leaving it selected in anticipation that the next message will go + * to the same chip. (That may increase power usage.) + * + * Also, the caller is guaranteeing that the memory associated with the + * message will not be freed before this call returns. + * + * Return: zero on success, else a negative error code. + */ +int spi_sync(struct spi_device *spi, struct spi_message *message) +{ + int ret; + + mutex_lock(&spi->controller->bus_lock_mutex); + ret = __spi_sync(spi, message); + mutex_unlock(&spi->controller->bus_lock_mutex); + + return ret; +} +EXPORT_SYMBOL_GPL(spi_sync); + +/** + * spi_sync_locked - version of spi_sync with exclusive bus usage + * @spi: device with which data will be exchanged + * @message: describes the data transfers + * Context: can sleep + * + * This call may only be used from a context that may sleep. The sleep + * is non-interruptible, and has no timeout. Low-overhead controller + * drivers may DMA directly into and out of the message buffers. + * + * This call should be used by drivers that require exclusive access to the + * SPI bus. It has to be preceded by a spi_bus_lock call. The SPI bus must + * be released by a spi_bus_unlock call when the exclusive access is over. + * + * Return: zero on success, else a negative error code. + */ +int spi_sync_locked(struct spi_device *spi, struct spi_message *message) +{ + return __spi_sync(spi, message); +} +EXPORT_SYMBOL_GPL(spi_sync_locked); + +/** + * spi_bus_lock - obtain a lock for exclusive SPI bus usage + * @ctlr: SPI bus master that should be locked for exclusive bus access + * Context: can sleep + * + * This call may only be used from a context that may sleep. The sleep + * is non-interruptible, and has no timeout. + * + * This call should be used by drivers that require exclusive access to the + * SPI bus. The SPI bus must be released by a spi_bus_unlock call when the + * exclusive access is over. Data transfer must be done by spi_sync_locked + * and spi_async_locked calls when the SPI bus lock is held. + * + * Return: always zero. + */ +int spi_bus_lock(struct spi_controller *ctlr) +{ + unsigned long flags; + + mutex_lock(&ctlr->bus_lock_mutex); + + spin_lock_irqsave(&ctlr->bus_lock_spinlock, flags); + ctlr->bus_lock_flag = 1; + spin_unlock_irqrestore(&ctlr->bus_lock_spinlock, flags); + + /* mutex remains locked until spi_bus_unlock is called */ + + return 0; +} +EXPORT_SYMBOL_GPL(spi_bus_lock); + +/** + * spi_bus_unlock - release the lock for exclusive SPI bus usage + * @ctlr: SPI bus master that was locked for exclusive bus access + * Context: can sleep + * + * This call may only be used from a context that may sleep. The sleep + * is non-interruptible, and has no timeout. + * + * This call releases an SPI bus lock previously obtained by an spi_bus_lock + * call. + * + * Return: always zero. + */ +int spi_bus_unlock(struct spi_controller *ctlr) +{ + ctlr->bus_lock_flag = 0; + + mutex_unlock(&ctlr->bus_lock_mutex); + + return 0; +} +EXPORT_SYMBOL_GPL(spi_bus_unlock); + +/* portable code must never pass more than 32 bytes */ +#define SPI_BUFSIZ max(32, SMP_CACHE_BYTES) + +static u8 *buf; + +/** + * spi_write_then_read - SPI synchronous write followed by read + * @spi: device with which data will be exchanged + * @txbuf: data to be written (need not be dma-safe) + * @n_tx: size of txbuf, in bytes + * @rxbuf: buffer into which data will be read (need not be dma-safe) + * @n_rx: size of rxbuf, in bytes + * Context: can sleep + * + * This performs a half duplex MicroWire style transaction with the + * device, sending txbuf and then reading rxbuf. The return value + * is zero for success, else a negative errno status code. + * This call may only be used from a context that may sleep. + * + * Parameters to this routine are always copied using a small buffer. + * Performance-sensitive or bulk transfer code should instead use + * spi_{async,sync}() calls with dma-safe buffers. + * + * Return: zero on success, else a negative error code. + */ +int spi_write_then_read(struct spi_device *spi, + const void *txbuf, unsigned n_tx, + void *rxbuf, unsigned n_rx) +{ + static DEFINE_MUTEX(lock); + + int status; + struct spi_message message; + struct spi_transfer x[2]; + u8 *local_buf; + + /* Use preallocated DMA-safe buffer if we can. We can't avoid + * copying here, (as a pure convenience thing), but we can + * keep heap costs out of the hot path unless someone else is + * using the pre-allocated buffer or the transfer is too large. + */ + if ((n_tx + n_rx) > SPI_BUFSIZ || !mutex_trylock(&lock)) { + local_buf = kmalloc(max((unsigned)SPI_BUFSIZ, n_tx + n_rx), + GFP_KERNEL | GFP_DMA); + if (!local_buf) + return -ENOMEM; + } else { + local_buf = buf; + } + + spi_message_init(&message); + memset(x, 0, sizeof(x)); + if (n_tx) { + x[0].len = n_tx; + spi_message_add_tail(&x[0], &message); + } + if (n_rx) { + x[1].len = n_rx; + spi_message_add_tail(&x[1], &message); + } + + memcpy(local_buf, txbuf, n_tx); + x[0].tx_buf = local_buf; + x[1].rx_buf = local_buf + n_tx; + + /* do the i/o */ + status = spi_sync(spi, &message); + if (status == 0) + memcpy(rxbuf, x[1].rx_buf, n_rx); + + if (x[0].tx_buf == buf) + mutex_unlock(&lock); + else + kfree(local_buf); + + return status; +} +EXPORT_SYMBOL_GPL(spi_write_then_read); + +/*-------------------------------------------------------------------------*/ + +#if IS_ENABLED(CONFIG_OF) +/* must call put_device() when done with returned spi_device device */ +struct spi_device *of_find_spi_device_by_node(struct device_node *node) +{ + struct device *dev = bus_find_device_by_of_node(&spi_bus_type, node); + + return dev ? to_spi_device(dev) : NULL; +} +EXPORT_SYMBOL_GPL(of_find_spi_device_by_node); +#endif /* IS_ENABLED(CONFIG_OF) */ + +#if IS_ENABLED(CONFIG_OF_DYNAMIC) +/* the spi controllers are not using spi_bus, so we find it with another way */ +static struct spi_controller *of_find_spi_controller_by_node(struct device_node *node) +{ + struct device *dev; + + dev = class_find_device_by_of_node(&spi_master_class, node); + if (!dev && IS_ENABLED(CONFIG_SPI_SLAVE)) + dev = class_find_device_by_of_node(&spi_slave_class, node); + if (!dev) + return NULL; + + /* reference got in class_find_device */ + return container_of(dev, struct spi_controller, dev); +} + +static int of_spi_notify(struct notifier_block *nb, unsigned long action, + void *arg) +{ + struct of_reconfig_data *rd = arg; + struct spi_controller *ctlr; + struct spi_device *spi; + + switch (of_reconfig_get_state_change(action, arg)) { + case OF_RECONFIG_CHANGE_ADD: + ctlr = of_find_spi_controller_by_node(rd->dn->parent); + if (ctlr == NULL) + return NOTIFY_OK; /* not for us */ + + if (of_node_test_and_set_flag(rd->dn, OF_POPULATED)) { + put_device(&ctlr->dev); + return NOTIFY_OK; + } + + spi = of_register_spi_device(ctlr, rd->dn); + put_device(&ctlr->dev); + + if (IS_ERR(spi)) { + pr_err("%s: failed to create for '%pOF'\n", + __func__, rd->dn); + of_node_clear_flag(rd->dn, OF_POPULATED); + return notifier_from_errno(PTR_ERR(spi)); + } + break; + + case OF_RECONFIG_CHANGE_REMOVE: + /* already depopulated? */ + if (!of_node_check_flag(rd->dn, OF_POPULATED)) + return NOTIFY_OK; + + /* find our device by node */ + spi = of_find_spi_device_by_node(rd->dn); + if (spi == NULL) + return NOTIFY_OK; /* no? not meant for us */ + + /* unregister takes one ref away */ + spi_unregister_device(spi); + + /* and put the reference of the find */ + put_device(&spi->dev); + break; + } + + return NOTIFY_OK; +} + +static struct notifier_block spi_of_notifier = { + .notifier_call = of_spi_notify, +}; +#else /* IS_ENABLED(CONFIG_OF_DYNAMIC) */ +extern struct notifier_block spi_of_notifier; +#endif /* IS_ENABLED(CONFIG_OF_DYNAMIC) */ + +#if IS_ENABLED(CONFIG_ACPI) +static int spi_acpi_controller_match(struct device *dev, const void *data) +{ + return ACPI_COMPANION(dev->parent) == data; +} + +static struct spi_controller *acpi_spi_find_controller_by_adev(struct acpi_device *adev) +{ + struct device *dev; + + dev = class_find_device(&spi_master_class, NULL, adev, + spi_acpi_controller_match); + if (!dev && IS_ENABLED(CONFIG_SPI_SLAVE)) + dev = class_find_device(&spi_slave_class, NULL, adev, + spi_acpi_controller_match); + if (!dev) + return NULL; + + return container_of(dev, struct spi_controller, dev); +} + +static struct spi_device *acpi_spi_find_device_by_adev(struct acpi_device *adev) +{ + struct device *dev; + + dev = bus_find_device_by_acpi_dev(&spi_bus_type, adev); + return to_spi_device(dev); +} + +static int acpi_spi_notify(struct notifier_block *nb, unsigned long value, + void *arg) +{ + struct acpi_device *adev = arg; + struct spi_controller *ctlr; + struct spi_device *spi; + + switch (value) { + case ACPI_RECONFIG_DEVICE_ADD: + ctlr = acpi_spi_find_controller_by_adev(adev->parent); + if (!ctlr) + break; + + acpi_register_spi_device(ctlr, adev); + put_device(&ctlr->dev); + break; + case ACPI_RECONFIG_DEVICE_REMOVE: + if (!acpi_device_enumerated(adev)) + break; + + spi = acpi_spi_find_device_by_adev(adev); + if (!spi) + break; + + spi_unregister_device(spi); + put_device(&spi->dev); + break; + } + + return NOTIFY_OK; +} + +static struct notifier_block spi_acpi_notifier = { + .notifier_call = acpi_spi_notify, +}; +#else +extern struct notifier_block spi_acpi_notifier; +#endif + +static int __init spi_init(void) +{ + int status; + + buf = kmalloc(SPI_BUFSIZ, GFP_KERNEL); + if (!buf) { + status = -ENOMEM; + goto err0; + } + + status = bus_register(&spi_bus_type); + if (status < 0) + goto err1; + + status = class_register(&spi_master_class); + if (status < 0) + goto err2; + + if (IS_ENABLED(CONFIG_SPI_SLAVE)) { + status = class_register(&spi_slave_class); + if (status < 0) + goto err3; + } + + if (IS_ENABLED(CONFIG_OF_DYNAMIC)) + WARN_ON(of_reconfig_notifier_register(&spi_of_notifier)); + if (IS_ENABLED(CONFIG_ACPI)) + WARN_ON(acpi_reconfig_notifier_register(&spi_acpi_notifier)); + + return 0; + +err3: + class_unregister(&spi_master_class); +err2: + bus_unregister(&spi_bus_type); +err1: + kfree(buf); + buf = NULL; +err0: + return status; +} + +/* board_info is normally registered in arch_initcall(), + * but even essential drivers wait till later + * + * REVISIT only boardinfo really needs static linking. the rest (device and + * driver registration) _could_ be dynamically linked (modular) ... costs + * include needing to have boardinfo data structures be much more public. + */ +postcore_initcall(spi_init); diff --git a/drivers/spi/spidev.c b/drivers/spi/spidev.c new file mode 100644 index 000000000..aee960a7d --- /dev/null +++ b/drivers/spi/spidev.c @@ -0,0 +1,878 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Simple synchronous userspace interface to SPI devices + * + * Copyright (C) 2006 SWAPP + * Andrea Paterniani <a.paterniani@swapp-eng.it> + * Copyright (C) 2007 David Brownell (simplification, cleanup) + */ + +#include <linux/init.h> +#include <linux/module.h> +#include <linux/ioctl.h> +#include <linux/fs.h> +#include <linux/device.h> +#include <linux/err.h> +#include <linux/list.h> +#include <linux/errno.h> +#include <linux/mutex.h> +#include <linux/slab.h> +#include <linux/compat.h> +#include <linux/of.h> +#include <linux/of_device.h> +#include <linux/acpi.h> + +#include <linux/spi/spi.h> +#include <linux/spi/spidev.h> + +#include <linux/uaccess.h> + + +/* + * This supports access to SPI devices using normal userspace I/O calls. + * Note that while traditional UNIX/POSIX I/O semantics are half duplex, + * and often mask message boundaries, full SPI support requires full duplex + * transfers. There are several kinds of internal message boundaries to + * handle chipselect management and other protocol options. + * + * SPI has a character major number assigned. We allocate minor numbers + * dynamically using a bitmask. You must use hotplug tools, such as udev + * (or mdev with busybox) to create and destroy the /dev/spidevB.C device + * nodes, since there is no fixed association of minor numbers with any + * particular SPI bus or device. + */ +#define SPIDEV_MAJOR 153 /* assigned */ +#define N_SPI_MINORS 32 /* ... up to 256 */ + +static DECLARE_BITMAP(minors, N_SPI_MINORS); + + +/* Bit masks for spi_device.mode management. Note that incorrect + * settings for some settings can cause *lots* of trouble for other + * devices on a shared bus: + * + * - CS_HIGH ... this device will be active when it shouldn't be + * - 3WIRE ... when active, it won't behave as it should + * - NO_CS ... there will be no explicit message boundaries; this + * is completely incompatible with the shared bus model + * - READY ... transfers may proceed when they shouldn't. + * + * REVISIT should changing those flags be privileged? + */ +#define SPI_MODE_MASK (SPI_CPHA | SPI_CPOL | SPI_CS_HIGH \ + | SPI_LSB_FIRST | SPI_3WIRE | SPI_LOOP \ + | SPI_NO_CS | SPI_READY | SPI_TX_DUAL \ + | SPI_TX_QUAD | SPI_TX_OCTAL | SPI_RX_DUAL \ + | SPI_RX_QUAD | SPI_RX_OCTAL) + +struct spidev_data { + dev_t devt; + spinlock_t spi_lock; + struct spi_device *spi; + struct list_head device_entry; + + /* TX/RX buffers are NULL unless this device is open (users > 0) */ + struct mutex buf_lock; + unsigned users; + u8 *tx_buffer; + u8 *rx_buffer; + u32 speed_hz; +}; + +static LIST_HEAD(device_list); +static DEFINE_MUTEX(device_list_lock); + +static unsigned bufsiz = 4096; +module_param(bufsiz, uint, S_IRUGO); +MODULE_PARM_DESC(bufsiz, "data bytes in biggest supported SPI message"); + +/*-------------------------------------------------------------------------*/ + +static ssize_t +spidev_sync(struct spidev_data *spidev, struct spi_message *message) +{ + int status; + struct spi_device *spi; + + spin_lock_irq(&spidev->spi_lock); + spi = spidev->spi; + spin_unlock_irq(&spidev->spi_lock); + + if (spi == NULL) + status = -ESHUTDOWN; + else + status = spi_sync(spi, message); + + if (status == 0) + status = message->actual_length; + + return status; +} + +static inline ssize_t +spidev_sync_write(struct spidev_data *spidev, size_t len) +{ + struct spi_transfer t = { + .tx_buf = spidev->tx_buffer, + .len = len, + .speed_hz = spidev->speed_hz, + }; + struct spi_message m; + + spi_message_init(&m); + spi_message_add_tail(&t, &m); + return spidev_sync(spidev, &m); +} + +static inline ssize_t +spidev_sync_read(struct spidev_data *spidev, size_t len) +{ + struct spi_transfer t = { + .rx_buf = spidev->rx_buffer, + .len = len, + .speed_hz = spidev->speed_hz, + }; + struct spi_message m; + + spi_message_init(&m); + spi_message_add_tail(&t, &m); + return spidev_sync(spidev, &m); +} + +/*-------------------------------------------------------------------------*/ + +/* Read-only message with current device setup */ +static ssize_t +spidev_read(struct file *filp, char __user *buf, size_t count, loff_t *f_pos) +{ + struct spidev_data *spidev; + ssize_t status; + + /* chipselect only toggles at start or end of operation */ + if (count > bufsiz) + return -EMSGSIZE; + + spidev = filp->private_data; + + mutex_lock(&spidev->buf_lock); + status = spidev_sync_read(spidev, count); + if (status > 0) { + unsigned long missing; + + missing = copy_to_user(buf, spidev->rx_buffer, status); + if (missing == status) + status = -EFAULT; + else + status = status - missing; + } + mutex_unlock(&spidev->buf_lock); + + return status; +} + +/* Write-only message with current device setup */ +static ssize_t +spidev_write(struct file *filp, const char __user *buf, + size_t count, loff_t *f_pos) +{ + struct spidev_data *spidev; + ssize_t status; + unsigned long missing; + + /* chipselect only toggles at start or end of operation */ + if (count > bufsiz) + return -EMSGSIZE; + + spidev = filp->private_data; + + mutex_lock(&spidev->buf_lock); + missing = copy_from_user(spidev->tx_buffer, buf, count); + if (missing == 0) + status = spidev_sync_write(spidev, count); + else + status = -EFAULT; + mutex_unlock(&spidev->buf_lock); + + return status; +} + +static int spidev_message(struct spidev_data *spidev, + struct spi_ioc_transfer *u_xfers, unsigned n_xfers) +{ + struct spi_message msg; + struct spi_transfer *k_xfers; + struct spi_transfer *k_tmp; + struct spi_ioc_transfer *u_tmp; + unsigned n, total, tx_total, rx_total; + u8 *tx_buf, *rx_buf; + int status = -EFAULT; + + spi_message_init(&msg); + k_xfers = kcalloc(n_xfers, sizeof(*k_tmp), GFP_KERNEL); + if (k_xfers == NULL) + return -ENOMEM; + + /* Construct spi_message, copying any tx data to bounce buffer. + * We walk the array of user-provided transfers, using each one + * to initialize a kernel version of the same transfer. + */ + tx_buf = spidev->tx_buffer; + rx_buf = spidev->rx_buffer; + total = 0; + tx_total = 0; + rx_total = 0; + for (n = n_xfers, k_tmp = k_xfers, u_tmp = u_xfers; + n; + n--, k_tmp++, u_tmp++) { + /* Ensure that also following allocations from rx_buf/tx_buf will meet + * DMA alignment requirements. + */ + unsigned int len_aligned = ALIGN(u_tmp->len, ARCH_KMALLOC_MINALIGN); + + k_tmp->len = u_tmp->len; + + total += k_tmp->len; + /* Since the function returns the total length of transfers + * on success, restrict the total to positive int values to + * avoid the return value looking like an error. Also check + * each transfer length to avoid arithmetic overflow. + */ + if (total > INT_MAX || k_tmp->len > INT_MAX) { + status = -EMSGSIZE; + goto done; + } + + if (u_tmp->rx_buf) { + /* this transfer needs space in RX bounce buffer */ + rx_total += len_aligned; + if (rx_total > bufsiz) { + status = -EMSGSIZE; + goto done; + } + k_tmp->rx_buf = rx_buf; + rx_buf += len_aligned; + } + if (u_tmp->tx_buf) { + /* this transfer needs space in TX bounce buffer */ + tx_total += len_aligned; + if (tx_total > bufsiz) { + status = -EMSGSIZE; + goto done; + } + k_tmp->tx_buf = tx_buf; + if (copy_from_user(tx_buf, (const u8 __user *) + (uintptr_t) u_tmp->tx_buf, + u_tmp->len)) + goto done; + tx_buf += len_aligned; + } + + k_tmp->cs_change = !!u_tmp->cs_change; + k_tmp->tx_nbits = u_tmp->tx_nbits; + k_tmp->rx_nbits = u_tmp->rx_nbits; + k_tmp->bits_per_word = u_tmp->bits_per_word; + k_tmp->delay.value = u_tmp->delay_usecs; + k_tmp->delay.unit = SPI_DELAY_UNIT_USECS; + k_tmp->speed_hz = u_tmp->speed_hz; + k_tmp->word_delay.value = u_tmp->word_delay_usecs; + k_tmp->word_delay.unit = SPI_DELAY_UNIT_USECS; + if (!k_tmp->speed_hz) + k_tmp->speed_hz = spidev->speed_hz; +#ifdef VERBOSE + dev_dbg(&spidev->spi->dev, + " xfer len %u %s%s%s%dbits %u usec %u usec %uHz\n", + k_tmp->len, + k_tmp->rx_buf ? "rx " : "", + k_tmp->tx_buf ? "tx " : "", + k_tmp->cs_change ? "cs " : "", + k_tmp->bits_per_word ? : spidev->spi->bits_per_word, + k_tmp->delay.value, + k_tmp->word_delay.value, + k_tmp->speed_hz ? : spidev->spi->max_speed_hz); +#endif + spi_message_add_tail(k_tmp, &msg); + } + + status = spidev_sync(spidev, &msg); + if (status < 0) + goto done; + + /* copy any rx data out of bounce buffer */ + for (n = n_xfers, k_tmp = k_xfers, u_tmp = u_xfers; + n; + n--, k_tmp++, u_tmp++) { + if (u_tmp->rx_buf) { + if (copy_to_user((u8 __user *) + (uintptr_t) u_tmp->rx_buf, k_tmp->rx_buf, + u_tmp->len)) { + status = -EFAULT; + goto done; + } + } + } + status = total; + +done: + kfree(k_xfers); + return status; +} + +static struct spi_ioc_transfer * +spidev_get_ioc_message(unsigned int cmd, struct spi_ioc_transfer __user *u_ioc, + unsigned *n_ioc) +{ + u32 tmp; + + /* Check type, command number and direction */ + if (_IOC_TYPE(cmd) != SPI_IOC_MAGIC + || _IOC_NR(cmd) != _IOC_NR(SPI_IOC_MESSAGE(0)) + || _IOC_DIR(cmd) != _IOC_WRITE) + return ERR_PTR(-ENOTTY); + + tmp = _IOC_SIZE(cmd); + if ((tmp % sizeof(struct spi_ioc_transfer)) != 0) + return ERR_PTR(-EINVAL); + *n_ioc = tmp / sizeof(struct spi_ioc_transfer); + if (*n_ioc == 0) + return NULL; + + /* copy into scratch area */ + return memdup_user(u_ioc, tmp); +} + +static long +spidev_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) +{ + int retval = 0; + struct spidev_data *spidev; + struct spi_device *spi; + u32 tmp; + unsigned n_ioc; + struct spi_ioc_transfer *ioc; + + /* Check type and command number */ + if (_IOC_TYPE(cmd) != SPI_IOC_MAGIC) + return -ENOTTY; + + /* guard against device removal before, or while, + * we issue this ioctl. + */ + spidev = filp->private_data; + spin_lock_irq(&spidev->spi_lock); + spi = spi_dev_get(spidev->spi); + spin_unlock_irq(&spidev->spi_lock); + + if (spi == NULL) + return -ESHUTDOWN; + + /* use the buffer lock here for triple duty: + * - prevent I/O (from us) so calling spi_setup() is safe; + * - prevent concurrent SPI_IOC_WR_* from morphing + * data fields while SPI_IOC_RD_* reads them; + * - SPI_IOC_MESSAGE needs the buffer locked "normally". + */ + mutex_lock(&spidev->buf_lock); + + switch (cmd) { + /* read requests */ + case SPI_IOC_RD_MODE: + case SPI_IOC_RD_MODE32: + tmp = spi->mode; + + { + struct spi_controller *ctlr = spi->controller; + + if (ctlr->use_gpio_descriptors && ctlr->cs_gpiods && + ctlr->cs_gpiods[spi->chip_select]) + tmp &= ~SPI_CS_HIGH; + } + + if (cmd == SPI_IOC_RD_MODE) + retval = put_user(tmp & SPI_MODE_MASK, + (__u8 __user *)arg); + else + retval = put_user(tmp & SPI_MODE_MASK, + (__u32 __user *)arg); + break; + case SPI_IOC_RD_LSB_FIRST: + retval = put_user((spi->mode & SPI_LSB_FIRST) ? 1 : 0, + (__u8 __user *)arg); + break; + case SPI_IOC_RD_BITS_PER_WORD: + retval = put_user(spi->bits_per_word, (__u8 __user *)arg); + break; + case SPI_IOC_RD_MAX_SPEED_HZ: + retval = put_user(spidev->speed_hz, (__u32 __user *)arg); + break; + + /* write requests */ + case SPI_IOC_WR_MODE: + case SPI_IOC_WR_MODE32: + if (cmd == SPI_IOC_WR_MODE) + retval = get_user(tmp, (u8 __user *)arg); + else + retval = get_user(tmp, (u32 __user *)arg); + if (retval == 0) { + struct spi_controller *ctlr = spi->controller; + u32 save = spi->mode; + + if (tmp & ~SPI_MODE_MASK) { + retval = -EINVAL; + break; + } + + if (ctlr->use_gpio_descriptors && ctlr->cs_gpiods && + ctlr->cs_gpiods[spi->chip_select]) + tmp |= SPI_CS_HIGH; + + tmp |= spi->mode & ~SPI_MODE_MASK; + spi->mode = (u16)tmp; + retval = spi_setup(spi); + if (retval < 0) + spi->mode = save; + else + dev_dbg(&spi->dev, "spi mode %x\n", tmp); + } + break; + case SPI_IOC_WR_LSB_FIRST: + retval = get_user(tmp, (__u8 __user *)arg); + if (retval == 0) { + u32 save = spi->mode; + + if (tmp) + spi->mode |= SPI_LSB_FIRST; + else + spi->mode &= ~SPI_LSB_FIRST; + retval = spi_setup(spi); + if (retval < 0) + spi->mode = save; + else + dev_dbg(&spi->dev, "%csb first\n", + tmp ? 'l' : 'm'); + } + break; + case SPI_IOC_WR_BITS_PER_WORD: + retval = get_user(tmp, (__u8 __user *)arg); + if (retval == 0) { + u8 save = spi->bits_per_word; + + spi->bits_per_word = tmp; + retval = spi_setup(spi); + if (retval < 0) + spi->bits_per_word = save; + else + dev_dbg(&spi->dev, "%d bits per word\n", tmp); + } + break; + case SPI_IOC_WR_MAX_SPEED_HZ: + retval = get_user(tmp, (__u32 __user *)arg); + if (retval == 0) { + u32 save = spi->max_speed_hz; + + spi->max_speed_hz = tmp; + retval = spi_setup(spi); + if (retval == 0) { + spidev->speed_hz = tmp; + dev_dbg(&spi->dev, "%d Hz (max)\n", + spidev->speed_hz); + } + spi->max_speed_hz = save; + } + break; + + default: + /* segmented and/or full-duplex I/O request */ + /* Check message and copy into scratch area */ + ioc = spidev_get_ioc_message(cmd, + (struct spi_ioc_transfer __user *)arg, &n_ioc); + if (IS_ERR(ioc)) { + retval = PTR_ERR(ioc); + break; + } + if (!ioc) + break; /* n_ioc is also 0 */ + + /* translate to spi_message, execute */ + retval = spidev_message(spidev, ioc, n_ioc); + kfree(ioc); + break; + } + + mutex_unlock(&spidev->buf_lock); + spi_dev_put(spi); + return retval; +} + +#ifdef CONFIG_COMPAT +static long +spidev_compat_ioc_message(struct file *filp, unsigned int cmd, + unsigned long arg) +{ + struct spi_ioc_transfer __user *u_ioc; + int retval = 0; + struct spidev_data *spidev; + struct spi_device *spi; + unsigned n_ioc, n; + struct spi_ioc_transfer *ioc; + + u_ioc = (struct spi_ioc_transfer __user *) compat_ptr(arg); + + /* guard against device removal before, or while, + * we issue this ioctl. + */ + spidev = filp->private_data; + spin_lock_irq(&spidev->spi_lock); + spi = spi_dev_get(spidev->spi); + spin_unlock_irq(&spidev->spi_lock); + + if (spi == NULL) + return -ESHUTDOWN; + + /* SPI_IOC_MESSAGE needs the buffer locked "normally" */ + mutex_lock(&spidev->buf_lock); + + /* Check message and copy into scratch area */ + ioc = spidev_get_ioc_message(cmd, u_ioc, &n_ioc); + if (IS_ERR(ioc)) { + retval = PTR_ERR(ioc); + goto done; + } + if (!ioc) + goto done; /* n_ioc is also 0 */ + + /* Convert buffer pointers */ + for (n = 0; n < n_ioc; n++) { + ioc[n].rx_buf = (uintptr_t) compat_ptr(ioc[n].rx_buf); + ioc[n].tx_buf = (uintptr_t) compat_ptr(ioc[n].tx_buf); + } + + /* translate to spi_message, execute */ + retval = spidev_message(spidev, ioc, n_ioc); + kfree(ioc); + +done: + mutex_unlock(&spidev->buf_lock); + spi_dev_put(spi); + return retval; +} + +static long +spidev_compat_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) +{ + if (_IOC_TYPE(cmd) == SPI_IOC_MAGIC + && _IOC_NR(cmd) == _IOC_NR(SPI_IOC_MESSAGE(0)) + && _IOC_DIR(cmd) == _IOC_WRITE) + return spidev_compat_ioc_message(filp, cmd, arg); + + return spidev_ioctl(filp, cmd, (unsigned long)compat_ptr(arg)); +} +#else +#define spidev_compat_ioctl NULL +#endif /* CONFIG_COMPAT */ + +static int spidev_open(struct inode *inode, struct file *filp) +{ + struct spidev_data *spidev; + int status = -ENXIO; + + mutex_lock(&device_list_lock); + + list_for_each_entry(spidev, &device_list, device_entry) { + if (spidev->devt == inode->i_rdev) { + status = 0; + break; + } + } + + if (status) { + pr_debug("spidev: nothing for minor %d\n", iminor(inode)); + goto err_find_dev; + } + + if (!spidev->tx_buffer) { + spidev->tx_buffer = kmalloc(bufsiz, GFP_KERNEL); + if (!spidev->tx_buffer) { + status = -ENOMEM; + goto err_find_dev; + } + } + + if (!spidev->rx_buffer) { + spidev->rx_buffer = kmalloc(bufsiz, GFP_KERNEL); + if (!spidev->rx_buffer) { + status = -ENOMEM; + goto err_alloc_rx_buf; + } + } + + spidev->users++; + filp->private_data = spidev; + stream_open(inode, filp); + + mutex_unlock(&device_list_lock); + return 0; + +err_alloc_rx_buf: + kfree(spidev->tx_buffer); + spidev->tx_buffer = NULL; +err_find_dev: + mutex_unlock(&device_list_lock); + return status; +} + +static int spidev_release(struct inode *inode, struct file *filp) +{ + struct spidev_data *spidev; + int dofree; + + mutex_lock(&device_list_lock); + spidev = filp->private_data; + filp->private_data = NULL; + + spin_lock_irq(&spidev->spi_lock); + /* ... after we unbound from the underlying device? */ + dofree = (spidev->spi == NULL); + spin_unlock_irq(&spidev->spi_lock); + + /* last close? */ + spidev->users--; + if (!spidev->users) { + + kfree(spidev->tx_buffer); + spidev->tx_buffer = NULL; + + kfree(spidev->rx_buffer); + spidev->rx_buffer = NULL; + + if (dofree) + kfree(spidev); + else + spidev->speed_hz = spidev->spi->max_speed_hz; + } +#ifdef CONFIG_SPI_SLAVE + if (!dofree) + spi_slave_abort(spidev->spi); +#endif + mutex_unlock(&device_list_lock); + + return 0; +} + +static const struct file_operations spidev_fops = { + .owner = THIS_MODULE, + /* REVISIT switch to aio primitives, so that userspace + * gets more complete API coverage. It'll simplify things + * too, except for the locking. + */ + .write = spidev_write, + .read = spidev_read, + .unlocked_ioctl = spidev_ioctl, + .compat_ioctl = spidev_compat_ioctl, + .open = spidev_open, + .release = spidev_release, + .llseek = no_llseek, +}; + +/*-------------------------------------------------------------------------*/ + +/* The main reason to have this class is to make mdev/udev create the + * /dev/spidevB.C character device nodes exposing our userspace API. + * It also simplifies memory management. + */ + +static struct class *spidev_class; + +#ifdef CONFIG_OF +static const struct of_device_id spidev_dt_ids[] = { + { .compatible = "rohm,dh2228fv" }, + { .compatible = "lineartechnology,ltc2488" }, + { .compatible = "ge,achc" }, + { .compatible = "semtech,sx1301" }, + { .compatible = "lwn,bk4" }, + { .compatible = "dh,dhcom-board" }, + { .compatible = "menlo,m53cpld" }, + {}, +}; +MODULE_DEVICE_TABLE(of, spidev_dt_ids); +#endif + +#ifdef CONFIG_ACPI + +/* Dummy SPI devices not to be used in production systems */ +#define SPIDEV_ACPI_DUMMY 1 + +static const struct acpi_device_id spidev_acpi_ids[] = { + /* + * The ACPI SPT000* devices are only meant for development and + * testing. Systems used in production should have a proper ACPI + * description of the connected peripheral and they should also use + * a proper driver instead of poking directly to the SPI bus. + */ + { "SPT0001", SPIDEV_ACPI_DUMMY }, + { "SPT0002", SPIDEV_ACPI_DUMMY }, + { "SPT0003", SPIDEV_ACPI_DUMMY }, + {}, +}; +MODULE_DEVICE_TABLE(acpi, spidev_acpi_ids); + +static void spidev_probe_acpi(struct spi_device *spi) +{ + const struct acpi_device_id *id; + + if (!has_acpi_companion(&spi->dev)) + return; + + id = acpi_match_device(spidev_acpi_ids, &spi->dev); + if (WARN_ON(!id)) + return; + + if (id->driver_data == SPIDEV_ACPI_DUMMY) + dev_warn(&spi->dev, "do not use this driver in production systems!\n"); +} +#else +static inline void spidev_probe_acpi(struct spi_device *spi) {} +#endif + +/*-------------------------------------------------------------------------*/ + +static int spidev_probe(struct spi_device *spi) +{ + struct spidev_data *spidev; + int status; + unsigned long minor; + + /* + * spidev should never be referenced in DT without a specific + * compatible string, it is a Linux implementation thing + * rather than a description of the hardware. + */ + WARN(spi->dev.of_node && + of_device_is_compatible(spi->dev.of_node, "spidev"), + "%pOF: buggy DT: spidev listed directly in DT\n", spi->dev.of_node); + + spidev_probe_acpi(spi); + + /* Allocate driver data */ + spidev = kzalloc(sizeof(*spidev), GFP_KERNEL); + if (!spidev) + return -ENOMEM; + + /* Initialize the driver data */ + spidev->spi = spi; + spin_lock_init(&spidev->spi_lock); + mutex_init(&spidev->buf_lock); + + INIT_LIST_HEAD(&spidev->device_entry); + + /* If we can allocate a minor number, hook up this device. + * Reusing minors is fine so long as udev or mdev is working. + */ + mutex_lock(&device_list_lock); + minor = find_first_zero_bit(minors, N_SPI_MINORS); + if (minor < N_SPI_MINORS) { + struct device *dev; + + spidev->devt = MKDEV(SPIDEV_MAJOR, minor); + dev = device_create(spidev_class, &spi->dev, spidev->devt, + spidev, "spidev%d.%d", + spi->master->bus_num, spi->chip_select); + status = PTR_ERR_OR_ZERO(dev); + } else { + dev_dbg(&spi->dev, "no minor number available!\n"); + status = -ENODEV; + } + if (status == 0) { + set_bit(minor, minors); + list_add(&spidev->device_entry, &device_list); + } + mutex_unlock(&device_list_lock); + + spidev->speed_hz = spi->max_speed_hz; + + if (status == 0) + spi_set_drvdata(spi, spidev); + else + kfree(spidev); + + return status; +} + +static int spidev_remove(struct spi_device *spi) +{ + struct spidev_data *spidev = spi_get_drvdata(spi); + + /* prevent new opens */ + mutex_lock(&device_list_lock); + /* make sure ops on existing fds can abort cleanly */ + spin_lock_irq(&spidev->spi_lock); + spidev->spi = NULL; + spin_unlock_irq(&spidev->spi_lock); + + list_del(&spidev->device_entry); + device_destroy(spidev_class, spidev->devt); + clear_bit(MINOR(spidev->devt), minors); + if (spidev->users == 0) + kfree(spidev); + mutex_unlock(&device_list_lock); + + return 0; +} + +static struct spi_driver spidev_spi_driver = { + .driver = { + .name = "spidev", + .of_match_table = of_match_ptr(spidev_dt_ids), + .acpi_match_table = ACPI_PTR(spidev_acpi_ids), + }, + .probe = spidev_probe, + .remove = spidev_remove, + + /* NOTE: suspend/resume methods are not necessary here. + * We don't do anything except pass the requests to/from + * the underlying controller. The refrigerator handles + * most issues; the controller driver handles the rest. + */ +}; + +/*-------------------------------------------------------------------------*/ + +static int __init spidev_init(void) +{ + int status; + + /* Claim our 256 reserved device numbers. Then register a class + * that will key udev/mdev to add/remove /dev nodes. Last, register + * the driver which manages those device numbers. + */ + BUILD_BUG_ON(N_SPI_MINORS > 256); + status = register_chrdev(SPIDEV_MAJOR, "spi", &spidev_fops); + if (status < 0) + return status; + + spidev_class = class_create(THIS_MODULE, "spidev"); + if (IS_ERR(spidev_class)) { + unregister_chrdev(SPIDEV_MAJOR, spidev_spi_driver.driver.name); + return PTR_ERR(spidev_class); + } + + status = spi_register_driver(&spidev_spi_driver); + if (status < 0) { + class_destroy(spidev_class); + unregister_chrdev(SPIDEV_MAJOR, spidev_spi_driver.driver.name); + } + return status; +} +module_init(spidev_init); + +static void __exit spidev_exit(void) +{ + spi_unregister_driver(&spidev_spi_driver); + class_destroy(spidev_class); + unregister_chrdev(SPIDEV_MAJOR, spidev_spi_driver.driver.name); +} +module_exit(spidev_exit); + +MODULE_AUTHOR("Andrea Paterniani, <a.paterniani@swapp-eng.it>"); +MODULE_DESCRIPTION("User mode SPI device interface"); +MODULE_LICENSE("GPL"); +MODULE_ALIAS("spi:spidev"); |