linux-imx

// 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);

}

​