spi-sifive.c | Explore in Territory

// SPDX-License-Identifier: GPL-2.0
//
// Copyright 2018 SiFive, Inc.
//
// SiFive SPI controller driver (master mode only)
//
// Author: SiFive, Inc.
// [email protected]

#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 …

#define SIFIVE_SPI_MAX_CS …
#define SIFIVE_SPI_DEFAULT_DEPTH …
#define SIFIVE_SPI_DEFAULT_MAX_BITS …

/* register offsets */
#define SIFIVE_SPI_REG_SCKDIV …
#define SIFIVE_SPI_REG_SCKMODE …
#define SIFIVE_SPI_REG_CSID …
#define SIFIVE_SPI_REG_CSDEF …
#define SIFIVE_SPI_REG_CSMODE …
#define SIFIVE_SPI_REG_DELAY0 …
#define SIFIVE_SPI_REG_DELAY1 …
#define SIFIVE_SPI_REG_FMT …
#define SIFIVE_SPI_REG_TXDATA …
#define SIFIVE_SPI_REG_RXDATA …
#define SIFIVE_SPI_REG_TXMARK …
#define SIFIVE_SPI_REG_RXMARK …
#define SIFIVE_SPI_REG_FCTRL …
#define SIFIVE_SPI_REG_FFMT …
#define SIFIVE_SPI_REG_IE …
#define SIFIVE_SPI_REG_IP …

/* sckdiv bits */
#define SIFIVE_SPI_SCKDIV_DIV_MASK …

/* sckmode bits */
#define SIFIVE_SPI_SCKMODE_PHA …
#define SIFIVE_SPI_SCKMODE_POL …
#define SIFIVE_SPI_SCKMODE_MODE_MASK …

/* csmode bits */
#define SIFIVE_SPI_CSMODE_MODE_AUTO …
#define SIFIVE_SPI_CSMODE_MODE_HOLD …
#define SIFIVE_SPI_CSMODE_MODE_OFF …

/* delay0 bits */
#define SIFIVE_SPI_DELAY0_CSSCK(x) …
#define SIFIVE_SPI_DELAY0_CSSCK_MASK …
#define SIFIVE_SPI_DELAY0_SCKCS(x) …
#define SIFIVE_SPI_DELAY0_SCKCS_MASK …

/* delay1 bits */
#define SIFIVE_SPI_DELAY1_INTERCS(x) …
#define SIFIVE_SPI_DELAY1_INTERCS_MASK …
#define SIFIVE_SPI_DELAY1_INTERXFR(x) …
#define SIFIVE_SPI_DELAY1_INTERXFR_MASK …

/* fmt bits */
#define SIFIVE_SPI_FMT_PROTO_SINGLE …
#define SIFIVE_SPI_FMT_PROTO_DUAL …
#define SIFIVE_SPI_FMT_PROTO_QUAD …
#define SIFIVE_SPI_FMT_PROTO_MASK …
#define SIFIVE_SPI_FMT_ENDIAN …
#define SIFIVE_SPI_FMT_DIR …
#define SIFIVE_SPI_FMT_LEN(x) …
#define SIFIVE_SPI_FMT_LEN_MASK …

/* txdata bits */
#define SIFIVE_SPI_TXDATA_DATA_MASK …
#define SIFIVE_SPI_TXDATA_FULL …

/* rxdata bits */
#define SIFIVE_SPI_RXDATA_DATA_MASK …
#define SIFIVE_SPI_RXDATA_EMPTY …

/* ie and ip bits */
#define SIFIVE_SPI_IP_TXWM …
#define SIFIVE_SPI_IP_RXWM …

struct sifive_spi { … };

static void sifive_spi_write(struct sifive_spi *spi, int offset, u32 value)
{ … }

static u32 sifive_spi_read(struct sifive_spi *spi, int offset)
{ … }

static void sifive_spi_init(struct sifive_spi *spi)
{ … }

static int
sifive_spi_prepare_message(struct spi_controller *host, struct spi_message *msg)
{ … }

static void sifive_spi_set_cs(struct spi_device *device, bool is_high)
{ … }

static int
sifive_spi_prep_transfer(struct sifive_spi *spi, struct spi_device *device,
			 struct spi_transfer *t)
{ … }

static irqreturn_t sifive_spi_irq(int irq, void *dev_id)
{ … }

static void sifive_spi_wait(struct sifive_spi *spi, u32 bit, int poll)
{ … }

static void sifive_spi_tx(struct sifive_spi *spi, const u8 *tx_ptr)
{ … }

static void sifive_spi_rx(struct sifive_spi *spi, u8 *rx_ptr)
{ … }

static int
sifive_spi_transfer_one(struct spi_controller *host, struct spi_device *device,
			struct spi_transfer *t)
{ … }

static int sifive_spi_probe(struct platform_device *pdev)
{ … }

static void sifive_spi_remove(struct platform_device *pdev)
{ … }

static int sifive_spi_suspend(struct device *dev)
{ … }

static int sifive_spi_resume(struct device *dev)
{ … }

static DEFINE_SIMPLE_DEV_PM_OPS(sifive_spi_pm_ops,
				sifive_spi_suspend, sifive_spi_resume);


static const struct of_device_id sifive_spi_of_match[] = …;
MODULE_DEVICE_TABLE(of, sifive_spi_of_match);

static struct platform_driver sifive_spi_driver = …;
module_platform_driver(…) …;

MODULE_AUTHOR(…) …;
MODULE_DESCRIPTION(…) …;
MODULE_LICENSE(…) …;
linux/drivers/spi/spi-sifive.c
