linux/drivers/spi/spi-amd.c

// 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 <[email protected]>

#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>
#include <linux/iopoll.h>
#include <linux/spi/spi-mem.h>

#define AMD_SPI_CTRL0_REG …
#define AMD_SPI_EXEC_CMD …
#define AMD_SPI_FIFO_CLEAR …
#define AMD_SPI_BUSY …

#define AMD_SPI_OPCODE_REG …
#define AMD_SPI_CMD_TRIGGER_REG …
#define AMD_SPI_TRIGGER_CMD …

#define AMD_SPI_OPCODE_MASK …

#define AMD_SPI_ALT_CS_REG …
#define AMD_SPI_ALT_CS_MASK …

#define AMD_SPI_FIFO_BASE …
#define AMD_SPI_TX_COUNT_REG …
#define AMD_SPI_RX_COUNT_REG …
#define AMD_SPI_STATUS_REG …

#define AMD_SPI_FIFO_SIZE …
#define AMD_SPI_MEM_SIZE …
#define AMD_SPI_MAX_DATA …

#define AMD_SPI_ENA_REG …
#define AMD_SPI_ALT_SPD_SHIFT …
#define AMD_SPI_ALT_SPD_MASK …
#define AMD_SPI_SPI100_SHIFT …
#define AMD_SPI_SPI100_MASK …
#define AMD_SPI_SPEED_REG …
#define AMD_SPI_SPD7_SHIFT …
#define AMD_SPI_SPD7_MASK …

#define AMD_SPI_MAX_HZ …
#define AMD_SPI_MIN_HZ …

/**
 * enum amd_spi_versions - SPI controller versions
 * @AMD_SPI_V1:		AMDI0061 hardware version
 * @AMD_SPI_V2:		AMDI0062 hardware version
 */
enum amd_spi_versions { … };

enum amd_spi_speed { … };

/**
 * struct amd_spi_freq - Matches device speed with values to write in regs
 * @speed_hz: Device frequency
 * @enable_val: Value to be written to "enable register"
 * @spd7_val: Some frequencies requires to have a value written at SPISPEED register
 */
struct amd_spi_freq { … };

/**
 * struct amd_spi - SPI driver instance
 * @io_remap_addr:	Start address of the SPI controller registers
 * @version:		SPI controller hardware version
 * @speed_hz:		Device frequency
 */
struct amd_spi { … };

static inline u8 amd_spi_readreg8(struct amd_spi *amd_spi, int idx)
{ … }

static inline void amd_spi_writereg8(struct amd_spi *amd_spi, int idx, u8 val)
{ … }

static void amd_spi_setclear_reg8(struct amd_spi *amd_spi, int idx, u8 set, u8 clear)
{ … }

static inline u32 amd_spi_readreg32(struct amd_spi *amd_spi, int idx)
{ … }

static inline void amd_spi_writereg32(struct amd_spi *amd_spi, int idx, u32 val)
{ … }

static inline void amd_spi_setclear_reg32(struct amd_spi *amd_spi, int idx, u32 set, u32 clear)
{ … }

static void amd_spi_select_chip(struct amd_spi *amd_spi, u8 cs)
{ … }

static inline void amd_spi_clear_chip(struct amd_spi *amd_spi, u8 chip_select)
{ … }

static void amd_spi_clear_fifo_ptr(struct amd_spi *amd_spi)
{ … }

static int amd_spi_set_opcode(struct amd_spi *amd_spi, u8 cmd_opcode)
{ … }

static inline void amd_spi_set_rx_count(struct amd_spi *amd_spi, u8 rx_count)
{ … }

static inline void amd_spi_set_tx_count(struct amd_spi *amd_spi, u8 tx_count)
{ … }

static int amd_spi_busy_wait(struct amd_spi *amd_spi)
{ … }

static int amd_spi_execute_opcode(struct amd_spi *amd_spi)
{ … }

static int amd_spi_host_setup(struct spi_device *spi)
{ … }

static const struct amd_spi_freq amd_spi_freq[] = …;

static int amd_set_spi_freq(struct amd_spi *amd_spi, u32 speed_hz)
{ … }

static inline int amd_spi_fifo_xfer(struct amd_spi *amd_spi,
				    struct spi_controller *host,
				    struct spi_message *message)
{ … }

static bool amd_spi_supports_op(struct spi_mem *mem,
				const struct spi_mem_op *op)
{ … }

static int amd_spi_adjust_op_size(struct spi_mem *mem, struct spi_mem_op *op)
{ … }

static void amd_spi_set_addr(struct amd_spi *amd_spi,
			     const struct spi_mem_op *op)
{ … }

static void amd_spi_mem_data_out(struct amd_spi *amd_spi,
				 const struct spi_mem_op *op)
{ … }

static void amd_spi_mem_data_in(struct amd_spi *amd_spi,
				const struct spi_mem_op *op)
{ … }

static int amd_spi_exec_mem_op(struct spi_mem *mem,
			       const struct spi_mem_op *op)
{ … }

static const struct spi_controller_mem_ops amd_spi_mem_ops = …;

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

static size_t amd_spi_max_transfer_size(struct spi_device *spi)
{ … }

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

#ifdef CONFIG_ACPI
static const struct acpi_device_id spi_acpi_match[] = …;
MODULE_DEVICE_TABLE(acpi, spi_acpi_match);
#endif

static struct platform_driver amd_spi_driver = …;

module_platform_driver(…) …;

MODULE_LICENSE(…) …;
MODULE_AUTHOR(…) …;
MODULE_DESCRIPTION(…) …;