diff options
Diffstat (limited to 'drivers/spi/spi-sh-msiof.c')
| -rw-r--r-- | drivers/spi/spi-sh-msiof.c | 1444 |
1 files changed, 1444 insertions, 0 deletions
diff --git a/drivers/spi/spi-sh-msiof.c b/drivers/spi/spi-sh-msiof.c new file mode 100644 index 0000000000..cfc3b1ddbd --- /dev/null +++ b/drivers/spi/spi-sh-msiof.c @@ -0,0 +1,1444 @@ +// 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/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 target_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, + struct spi_transfer *t) +{ + unsigned long parent_rate = clk_get_rate(p->clk); + unsigned int div_pow = p->min_div_pow; + u32 spi_hz = t->speed_hz; + unsigned long div; + u32 brps, scr; + + 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; + } + + t->effective_speed_hz = parent_rate / (brps << div_pow); + + 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_target(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_get_csgpiod(spi, 0) || spi_controller_is_target(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_get_csgpiod(spi, 0)) { + ss = ctlr->unused_native_cs; + cs_high = p->native_cs_high; + } else { + ss = spi_get_chipselect(spi, 0); + 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 target = spi_controller_is_target(p->ctlr); + int ret = 0; + + /* setup clock and rx/tx signals */ + if (!target) + 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 && !target) + 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 target = spi_controller_is_target(p->ctlr); + int ret = 0; + + /* shut down frame, rx/tx and clock signals */ + if (!target) + 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 && !target) + ret = sh_msiof_modify_ctr_wait(p, SICTR_TSCKE, 0); + + return ret; +} + +static int sh_msiof_target_abort(struct spi_controller *ctlr) +{ + struct sh_msiof_spi_priv *p = spi_controller_get_devdata(ctlr); + + p->target_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_target(p->ctlr)) { + if (wait_for_completion_interruptible(x) || + p->target_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->target_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->target_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_sync(p->ctlr->dma_tx); +no_dma_tx: + if (rx) + dmaengine_terminate_sync(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_target(p->ctlr)) + sh_msiof_spi_set_clk_regs(p, t); + + 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[] __maybe_unused = { + { .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,rcar-gen4-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_TARGET + : MSIOF_SPI_HOST; + + /* Parse the MSIOF properties */ + if (info->mode == MSIOF_SPI_HOST) + 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; + unsigned long clksrc; + 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_TARGET) + ctlr = spi_alloc_target(&pdev->dev, + sizeof(struct sh_msiof_spi_priv)); + else + ctlr = spi_alloc_host(&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; + clksrc = clk_get_rate(p->clk); + ctlr->min_speed_hz = DIV_ROUND_UP(clksrc, 1024); + ctlr->max_speed_hz = DIV_ROUND_UP(clksrc, 1 << p->min_div_pow); + 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->target_abort = sh_msiof_target_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 void 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); +} + +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_new = 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"); |