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/* linux/drivers/spi/spi_s3c24xx_gpio.c

 *

 * Copyright (c) 2006 Ben Dooks

 * Copyright (c) 2006 Simtec Electronics

 *

 * S3C24XX GPIO based SPI driver

 *

 * 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/kernel.h>

#include <linux/init.h>

#include <linux/delay.h>

#include <linux/spinlock.h>

#include <linux/workqueue.h>

#include <linux/platform_device.h>

#include <linux/spi/spi.h>

#include <linux/spi/spi_bitbang.h>

#include <asm/arch/regs-gpio.h>

#include <asm/arch/spi-gpio.h>

#include <asm/hardware.h>

struct s3c2410_spigpio {

        struct spi_bitbang               bitbang;

        struct s3c2410_spigpio_info     *info;

        struct platform_device          *dev;

};

static inline struct s3c2410_spigpio *spidev_to_sg(struct spi_device *spi)

{

        return spi->controller_data;

}

static inline void setsck(struct spi_device *dev, int on)

{

        struct s3c2410_spigpio *sg = spidev_to_sg(dev);

        s3c2410_gpio_setpin(sg->info->pin_clk, on ? 1 : 0);

}

static inline void setmosi(struct spi_device *dev, int on)

{

        struct s3c2410_spigpio *sg = spidev_to_sg(dev);

        s3c2410_gpio_setpin(sg->info->pin_mosi, on ? 1 : 0);

}

static inline u32 getmiso(struct spi_device *dev)

{

        struct s3c2410_spigpio *sg = spidev_to_sg(dev);

        return s3c2410_gpio_getpin(sg->info->pin_miso) ? 1 : 0;

}

#define spidelay(x) ndelay(x)

#define EXPAND_BITBANG_TXRX

#include <linux/spi/spi_bitbang.h>

static u32 s3c2410_spigpio_txrx_mode0(struct spi_device *spi,

                                      unsigned nsecs, u32 word, u8 bits)

{

        return bitbang_txrx_be_cpha0(spi, nsecs, 0, word, bits);

}

static u32 s3c2410_spigpio_txrx_mode1(struct spi_device *spi,

                                      unsigned nsecs, u32 word, u8 bits)

{

        return bitbang_txrx_be_cpha1(spi, nsecs, 0, word, bits);

}

static u32 s3c2410_spigpio_txrx_mode2(struct spi_device *spi,

                                      unsigned nsecs, u32 word, u8 bits)

{

        return bitbang_txrx_be_cpha0(spi, nsecs, 1, word, bits);

}

static u32 s3c2410_spigpio_txrx_mode3(struct spi_device *spi,

                                      unsigned nsecs, u32 word, u8 bits)

{

        return bitbang_txrx_be_cpha1(spi, nsecs, 1, word, bits);

}

static void s3c2410_spigpio_chipselect(struct spi_device *dev, int value)

{

        struct s3c2410_spigpio *sg = spidev_to_sg(dev);

        if (sg->info && sg->info->chip_select)

                (sg->info->chip_select)(sg->info, value);

}

static int s3c2410_spigpio_probe(struct platform_device *dev)

{

        struct s3c2410_spigpio_info *info;

        struct spi_master       *master;

        struct s3c2410_spigpio  *sp;

        int ret;

        int i;

        master = spi_alloc_master(&dev->dev, sizeof(struct s3c2410_spigpio));

        if (master == NULL) {

                dev_err(&dev->dev, "failed to allocate spi master\n");

                ret = -ENOMEM;

                goto err;

        }

        sp = spi_master_get_devdata(master);

        platform_set_drvdata(dev, sp);

        /* copy in the plkatform data */

        info = sp->info = dev->dev.platform_data;

        /* setup spi bitbang adaptor */

        sp->bitbang.master = spi_master_get(master);

        sp->bitbang.master->bus_num = info->bus_num;

        sp->bitbang.chipselect = s3c2410_spigpio_chipselect;

        sp->bitbang.txrx_word[SPI_MODE_0] = s3c2410_spigpio_txrx_mode0;

        sp->bitbang.txrx_word[SPI_MODE_1] = s3c2410_spigpio_txrx_mode1;

        sp->bitbang.txrx_word[SPI_MODE_2] = s3c2410_spigpio_txrx_mode2;

        sp->bitbang.txrx_word[SPI_MODE_3] = s3c2410_spigpio_txrx_mode3;

        /* set state of spi pins, always assume that the clock is

         * available, but do check the MOSI and MISO. */

        s3c2410_gpio_setpin(info->pin_clk, 0);

        s3c2410_gpio_cfgpin(info->pin_clk, S3C2410_GPIO_OUTPUT);

        if (info->pin_mosi < S3C2410_GPH10) {

                s3c2410_gpio_setpin(info->pin_mosi, 0);

                s3c2410_gpio_cfgpin(info->pin_mosi, S3C2410_GPIO_OUTPUT);

        }

        if (info->pin_miso != S3C2410_GPA0 && info->pin_miso < S3C2410_GPH10)

                s3c2410_gpio_cfgpin(info->pin_miso, S3C2410_GPIO_INPUT);

        ret = spi_bitbang_start(&sp->bitbang);

        if (ret)

                goto err_no_bitbang;

        /* register the chips to go with the board */

        for (i = 0; i < sp->info->board_size; i++) {

                dev_info(&dev->dev, "registering %p: %s\n",

                         &sp->info->board_info[i],

                         sp->info->board_info[i].modalias);

                sp->info->board_info[i].controller_data = sp;

                spi_new_device(master, sp->info->board_info + i);

        }

        return 0;

 err_no_bitbang:

        spi_master_put(sp->bitbang.master);

 err:

        return ret;

}

static int s3c2410_spigpio_remove(struct platform_device *dev)

{

        struct s3c2410_spigpio *sp = platform_get_drvdata(dev);

        spi_bitbang_stop(&sp->bitbang);

        spi_master_put(sp->bitbang.master);

        return 0;

}

/* all gpio should be held over suspend/resume, so we should

 * not need to deal with this

*/

#define s3c2410_spigpio_suspend NULL

#define s3c2410_spigpio_resume NULL

static struct platform_driver s3c2410_spigpio_drv = {

        .probe          = s3c2410_spigpio_probe,

        .remove         = s3c2410_spigpio_remove,

        .suspend        = s3c2410_spigpio_suspend,

        .resume         = s3c2410_spigpio_resume,

        .driver         = {

                .name   = "spi_s3c24xx_gpio",

                .owner  = THIS_MODULE,

        },

};

static int __init s3c2410_spigpio_init(void)

{

        return platform_driver_register(&s3c2410_spigpio_drv);

}

static void __exit s3c2410_spigpio_exit(void)

{

        platform_driver_unregister(&s3c2410_spigpio_drv);

}

module_init(s3c2410_spigpio_init);

module_exit(s3c2410_spigpio_exit);

MODULE_DESCRIPTION("S3C24XX SPI Driver");

MODULE_AUTHOR("Ben Dooks, <ben@simtec.co.uk>");

MODULE_LICENSE("GPL");