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Diffstat (limited to '')
| -rw-r--r-- | drivers/spi/spi-fsl-lib.c | 160 |
1 files changed, 160 insertions, 0 deletions
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"); |