[deliverable/linux.git] / drivers / spi / spi_s3c24xx_gpio.c

/* 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;

	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;

	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

/* work with hotplug and coldplug */
MODULE_ALIAS("platform:spi_s3c24xx_gpio");

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");
Commit	Line	Data
1fc7547d BD	1	/* linux/drivers/spi/spi_s3c24xx_gpio.c
	2	*
	3	* Copyright (c) 2006 Ben Dooks
	4	* Copyright (c) 2006 Simtec Electronics
	5	*
	6	* S3C24XX GPIO based SPI driver
	7	*
	8	* This program is free software; you can redistribute it and/or modify
	9	* it under the terms of the GNU General Public License version 2 as
	10	* published by the Free Software Foundation.
	11	*
	12	*/
	13
1fc7547d BD	14	#include <linux/kernel.h>
	15	#include <linux/init.h>
	16	#include <linux/delay.h>
	17	#include <linux/spinlock.h>
6d3a25f1	18	#include <linux/workqueue.h>
1fc7547d BD	19	#include <linux/platform_device.h>
	20
	21	#include <linux/spi/spi.h>
	22	#include <linux/spi/spi_bitbang.h>
	23
	24	#include <asm/arch/regs-gpio.h>
	25	#include <asm/arch/spi-gpio.h>
e2a5d2f9	26	#include <asm/hardware.h>
1fc7547d BD	27
	28	struct s3c2410_spigpio {
	29	struct spi_bitbang bitbang;
	30
	31	struct s3c2410_spigpio_info *info;
	32	struct platform_device *dev;
	33	};
	34
	35	static inline struct s3c2410_spigpio spidev_to_sg(struct spi_device spi)
	36	{
	37	return spi->controller_data;
	38	}
	39
	40	static inline void setsck(struct spi_device *dev, int on)
	41	{
	42	struct s3c2410_spigpio *sg = spidev_to_sg(dev);
	43	s3c2410_gpio_setpin(sg->info->pin_clk, on ? 1 : 0);
	44	}
	45
	46	static inline void setmosi(struct spi_device *dev, int on)
	47	{
	48	struct s3c2410_spigpio *sg = spidev_to_sg(dev);
	49	s3c2410_gpio_setpin(sg->info->pin_mosi, on ? 1 : 0);
	50	}
	51
	52	static inline u32 getmiso(struct spi_device *dev)
	53	{
	54	struct s3c2410_spigpio *sg = spidev_to_sg(dev);
	55	return s3c2410_gpio_getpin(sg->info->pin_miso) ? 1 : 0;
	56	}
	57
	58	#define spidelay(x) ndelay(x)
	59
	60	#define EXPAND_BITBANG_TXRX
	61	#include <linux/spi/spi_bitbang.h>
	62
	63
	64	static u32 s3c2410_spigpio_txrx_mode0(struct spi_device *spi,
	65	unsigned nsecs, u32 word, u8 bits)
	66	{
	67	return bitbang_txrx_be_cpha0(spi, nsecs, 0, word, bits);
	68	}
	69
	70	static u32 s3c2410_spigpio_txrx_mode1(struct spi_device *spi,
	71	unsigned nsecs, u32 word, u8 bits)
	72	{
	73	return bitbang_txrx_be_cpha1(spi, nsecs, 0, word, bits);
	74	}
	75
d23c6c21 HW	76	static u32 s3c2410_spigpio_txrx_mode2(struct spi_device *spi,
	77	unsigned nsecs, u32 word, u8 bits)
	78	{
	79	return bitbang_txrx_be_cpha0(spi, nsecs, 1, word, bits);
	80	}
	81
	82	static u32 s3c2410_spigpio_txrx_mode3(struct spi_device *spi,
	83	unsigned nsecs, u32 word, u8 bits)
	84	{
	85	return bitbang_txrx_be_cpha1(spi, nsecs, 1, word, bits);
	86	}
	87
	88
1fc7547d BD	89	static void s3c2410_spigpio_chipselect(struct spi_device *dev, int value)
	90	{
	91	struct s3c2410_spigpio *sg = spidev_to_sg(dev);
	92
	93	if (sg->info && sg->info->chip_select)
	94	(sg->info->chip_select)(sg->info, value);
	95	}
	96
	97	static int s3c2410_spigpio_probe(struct platform_device *dev)
	98	{
438ae1ae	99	struct s3c2410_spigpio_info *info;
1fc7547d BD	100	struct spi_master *master;
	101	struct s3c2410_spigpio *sp;
	102	int ret;
1fc7547d BD	103
	104	master = spi_alloc_master(&dev->dev, sizeof(struct s3c2410_spigpio));
	105	if (master == NULL) {
	106	dev_err(&dev->dev, "failed to allocate spi master\n");
	107	ret = -ENOMEM;
	108	goto err;
	109	}
	110
	111	sp = spi_master_get_devdata(master);
	112
	113	platform_set_drvdata(dev, sp);
	114
	115	/* copy in the plkatform data */
438ae1ae	116	info = sp->info = dev->dev.platform_data;
1fc7547d BD	117
	118	/* setup spi bitbang adaptor */
	119	sp->bitbang.master = spi_master_get(master);
75d42798	120	sp->bitbang.master->bus_num = info->bus_num;
1fc7547d BD	121	sp->bitbang.chipselect = s3c2410_spigpio_chipselect;
	122
	123	sp->bitbang.txrx_word[SPI_MODE_0] = s3c2410_spigpio_txrx_mode0;
	124	sp->bitbang.txrx_word[SPI_MODE_1] = s3c2410_spigpio_txrx_mode1;
d23c6c21 HW	125	sp->bitbang.txrx_word[SPI_MODE_2] = s3c2410_spigpio_txrx_mode2;
d23c6c21 HW	126	sp->bitbang.txrx_word[SPI_MODE_3] = s3c2410_spigpio_txrx_mode3;
1fc7547d	127
438ae1ae BD	128	/* set state of spi pins, always assume that the clock is
	129	* available, but do check the MOSI and MISO. */
	130	s3c2410_gpio_setpin(info->pin_clk, 0);
	131	s3c2410_gpio_cfgpin(info->pin_clk, S3C2410_GPIO_OUTPUT);
1fc7547d	132
438ae1ae BD	133	if (info->pin_mosi < S3C2410_GPH10) {
	134	s3c2410_gpio_setpin(info->pin_mosi, 0);
	135	s3c2410_gpio_cfgpin(info->pin_mosi, S3C2410_GPIO_OUTPUT);
	136	}
	137
	138	if (info->pin_miso != S3C2410_GPA0 && info->pin_miso < S3C2410_GPH10)
	139	s3c2410_gpio_cfgpin(info->pin_miso, S3C2410_GPIO_INPUT);
1fc7547d BD	140
	141	ret = spi_bitbang_start(&sp->bitbang);
	142	if (ret)
	143	goto err_no_bitbang;
	144
1fc7547d BD	145	return 0;
	146
	147	err_no_bitbang:
	148	spi_master_put(sp->bitbang.master);
	149	err:
	150	return ret;
	151
	152	}
	153
	154	static int s3c2410_spigpio_remove(struct platform_device *dev)
	155	{
	156	struct s3c2410_spigpio *sp = platform_get_drvdata(dev);
	157
	158	spi_bitbang_stop(&sp->bitbang);
	159	spi_master_put(sp->bitbang.master);
	160
	161	return 0;
	162	}
	163
	164	/* all gpio should be held over suspend/resume, so we should
	165	* not need to deal with this
	166	*/
	167
	168	#define s3c2410_spigpio_suspend NULL
	169	#define s3c2410_spigpio_resume NULL
	170
7e38c3c4 KS	171	/* work with hotplug and coldplug */
7e38c3c4 KS	172	MODULE_ALIAS("platform:spi_s3c24xx_gpio");
1fc7547d BD	173
	174	static struct platform_driver s3c2410_spigpio_drv = {
	175	.probe = s3c2410_spigpio_probe,
	176	.remove = s3c2410_spigpio_remove,
	177	.suspend = s3c2410_spigpio_suspend,
	178	.resume = s3c2410_spigpio_resume,
	179	.driver = {
fc3ba952	180	.name = "spi_s3c24xx_gpio",
1fc7547d BD	181	.owner = THIS_MODULE,
	182	},
	183	};
	184
	185	static int __init s3c2410_spigpio_init(void)
	186	{
	187	return platform_driver_register(&s3c2410_spigpio_drv);
	188	}
	189
	190	static void __exit s3c2410_spigpio_exit(void)
	191	{
	192	platform_driver_unregister(&s3c2410_spigpio_drv);
	193	}
	194
	195	module_init(s3c2410_spigpio_init);
	196	module_exit(s3c2410_spigpio_exit);
	197
	198	MODULE_DESCRIPTION("S3C24XX SPI Driver");
	199	MODULE_AUTHOR("Ben Dooks, <ben@simtec.co.uk>");
	200	MODULE_LICENSE("GPL");