linux-imx

/*

 * Copyright (c) 2006 Ben Dooks

 * Copyright 2006-2009 Simtec Electronics

 *  Ben Dooks <ben@simtec.co.uk>

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License version 2 as

 * published by the Free Software Foundation.

 *

*/

​

#include <linux/spinlock.h>

#include <linux/interrupt.h>

#include <linux/delay.h>

#include <linux/errno.h>

#include <linux/err.h>

#include <linux/clk.h>

#include <linux/platform_device.h>

#include <linux/gpio.h>

#include <linux/io.h>

#include <linux/slab.h>

​

#include <linux/spi/spi.h>

#include <linux/spi/spi_bitbang.h>

#include <linux/spi/s3c24xx.h>

#include <linux/module.h>

​

#include <plat/regs-spi.h>

​

#include <asm/fiq.h>

​

#include "spi-s3c24xx-fiq.h"

​

/**

 * s3c24xx_spi_devstate - per device data

 * @hz: Last frequency calculated for @sppre field.

 * @mode: Last mode setting for the @spcon field.

 * @spcon: Value to write to the SPCON register.

 * @sppre: Value to write to the SPPRE register.

 */

struct s3c24xx_spi_devstate {

    unsigned int    hz;

    unsigned int    mode;

    u8      spcon;

    u8      sppre;

};

​

enum spi_fiq_mode {

    FIQ_MODE_NONE   = 0,

    FIQ_MODE_TX = 1,

    FIQ_MODE_RX = 2,

    FIQ_MODE_TXRX   = 3,

};

​

struct s3c24xx_spi {

    /* bitbang has to be first */

    struct spi_bitbang   bitbang;

    struct completion    done;

​

    void __iomem        *regs;

    int          irq;

    int          len;

    int          count;

​

    struct fiq_handler   fiq_handler;

    enum spi_fiq_mode    fiq_mode;

    unsigned char        fiq_inuse;

    unsigned char        fiq_claimed;

​

    void            (*set_cs)(struct s3c2410_spi_info *spi,

                      int cs, int pol);

​

    /* data buffers */

    const unsigned char *tx;

    unsigned char       *rx;

​

    struct clk      *clk;

    struct spi_master   *master;

    struct spi_device   *curdev;

    struct device       *dev;

    struct s3c2410_spi_info *pdata;

};

​

#define SPCON_DEFAULT (S3C2410_SPCON_MSTR | S3C2410_SPCON_SMOD_INT)

#define SPPIN_DEFAULT (S3C2410_SPPIN_KEEP)

​

static inline struct s3c24xx_spi *to_hw(struct spi_device *sdev)

{

    return spi_master_get_devdata(sdev->master);

}

​

static void s3c24xx_spi_gpiocs(struct s3c2410_spi_info *spi, int cs, int pol)