[mirror_ubuntu-bionic-kernel.git] / drivers / spi / spi_s3c24xx.c

/* linux/drivers/spi/spi_s3c24xx.c
 *
 * Copyright (c) 2006 Ben Dooks
 * Copyright (c) 2006 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/init.h>
#include <linux/spinlock.h>
#include <linux/workqueue.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/spi/spi.h>
#include <linux/spi/spi_bitbang.h>

#include <plat/regs-spi.h>
#include <mach/spi.h>

struct s3c24xx_spi {
	/* bitbang has to be first */
	struct spi_bitbang	 bitbang;
	struct completion	 done;

	void __iomem		*regs;
	int			 irq;
	int			 len;
	int			 count;

	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 resource		*ioarea;
	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)
{
	gpio_set_value(spi->pin_cs, pol);
}

static void s3c24xx_spi_chipsel(struct spi_device *spi, int value)
{
	struct s3c24xx_spi *hw = to_hw(spi);
	unsigned int cspol = spi->mode & SPI_CS_HIGH ? 1 : 0;
	unsigned int spcon;

	switch (value) {
	case BITBANG_CS_INACTIVE:
		hw->set_cs(hw->pdata, spi->chip_select, cspol^1);
		break;

	case BITBANG_CS_ACTIVE:
		spcon = readb(hw->regs + S3C2410_SPCON);

		if (spi->mode & SPI_CPHA)
			spcon |= S3C2410_SPCON_CPHA_FMTB;
		else
			spcon &= ~S3C2410_SPCON_CPHA_FMTB;

		if (spi->mode & SPI_CPOL)
			spcon |= S3C2410_SPCON_CPOL_HIGH;
		else
			spcon &= ~S3C2410_SPCON_CPOL_HIGH;

		spcon |= S3C2410_SPCON_ENSCK;

		/* write new configration */

		writeb(spcon, hw->regs + S3C2410_SPCON);
		hw->set_cs(hw->pdata, spi->chip_select, cspol);

		break;
	}
}

static int s3c24xx_spi_setupxfer(struct spi_device *spi,
				 struct spi_transfer *t)
{
	struct s3c24xx_spi *hw = to_hw(spi);
	unsigned int bpw;
	unsigned int hz;
	unsigned int div;
	unsigned long clk;

	bpw = t ? t->bits_per_word : spi->bits_per_word;
	hz  = t ? t->speed_hz : spi->max_speed_hz;

	if (!bpw)
		bpw = 8;

	if (!hz)
		hz = spi->max_speed_hz;

	if (bpw != 8) {
		dev_err(&spi->dev, "invalid bits-per-word (%d)\n", bpw);
		return -EINVAL;
	}

	clk = clk_get_rate(hw->clk);
	div = DIV_ROUND_UP(clk, hz * 2) - 1;

	if (div > 255)
		div = 255;

	dev_dbg(&spi->dev, "setting pre-scaler to %d (wanted %d, got %ld)\n",
		div, hz, clk / (2 * (div + 1)));


	writeb(div, hw->regs + S3C2410_SPPRE);

	spin_lock(&hw->bitbang.lock);
	if (!hw->bitbang.busy) {
		hw->bitbang.chipselect(spi, BITBANG_CS_INACTIVE);
		/* need to ndelay for 0.5 clocktick ? */
	}
	spin_unlock(&hw->bitbang.lock);

	return 0;
}

static int s3c24xx_spi_setup(struct spi_device *spi)
{
	int ret;

	ret = s3c24xx_spi_setupxfer(spi, NULL);
	if (ret < 0) {
		dev_err(&spi->dev, "setupxfer returned %d\n", ret);
		return ret;
	}

	return 0;
}

static inline unsigned int hw_txbyte(struct s3c24xx_spi *hw, int count)
{
	return hw->tx ? hw->tx[count] : 0;
}

static int s3c24xx_spi_txrx(struct spi_device *spi, struct spi_transfer *t)
{
	struct s3c24xx_spi *hw = to_hw(spi);

	dev_dbg(&spi->dev, "txrx: tx %p, rx %p, len %d\n",
		t->tx_buf, t->rx_buf, t->len);

	hw->tx = t->tx_buf;
	hw->rx = t->rx_buf;
	hw->len = t->len;
	hw->count = 0;

	init_completion(&hw->done);

	/* send the first byte */
	writeb(hw_txbyte(hw, 0), hw->regs + S3C2410_SPTDAT);

	wait_for_completion(&hw->done);

	return hw->count;
}

static irqreturn_t s3c24xx_spi_irq(int irq, void *dev)
{
	struct s3c24xx_spi *hw = dev;
	unsigned int spsta = readb(hw->regs + S3C2410_SPSTA);
	unsigned int count = hw->count;

	if (spsta & S3C2410_SPSTA_DCOL) {
		dev_dbg(hw->dev, "data-collision\n");
		complete(&hw->done);
		goto irq_done;
	}

	if (!(spsta & S3C2410_SPSTA_READY)) {
		dev_dbg(hw->dev, "spi not ready for tx?\n");
		complete(&hw->done);
		goto irq_done;
	}

	hw->count++;

	if (hw->rx)
		hw->rx[count] = readb(hw->regs + S3C2410_SPRDAT);

	count++;

	if (count < hw->len)
		writeb(hw_txbyte(hw, count), hw->regs + S3C2410_SPTDAT);
	else
		complete(&hw->done);

 irq_done:
	return IRQ_HANDLED;
}

static void s3c24xx_spi_initialsetup(struct s3c24xx_spi *hw)
{
	/* for the moment, permanently enable the clock */

	clk_enable(hw->clk);

	/* program defaults into the registers */

	writeb(0xff, hw->regs + S3C2410_SPPRE);
	writeb(SPPIN_DEFAULT, hw->regs + S3C2410_SPPIN);
	writeb(SPCON_DEFAULT, hw->regs + S3C2410_SPCON);

	if (hw->pdata) {
		if (hw->set_cs == s3c24xx_spi_gpiocs)
			gpio_direction_output(hw->pdata->pin_cs, 1);

		if (hw->pdata->gpio_setup)
			hw->pdata->gpio_setup(hw->pdata, 1);
	}
}

static int __init s3c24xx_spi_probe(struct platform_device *pdev)
{
	struct s3c2410_spi_info *pdata;
	struct s3c24xx_spi *hw;
	struct spi_master *master;
	struct resource *res;
	int err = 0;

	master = spi_alloc_master(&pdev->dev, sizeof(struct s3c24xx_spi));
	if (master == NULL) {
		dev_err(&pdev->dev, "No memory for spi_master\n");
		err = -ENOMEM;
		goto err_nomem;
	}

	hw = spi_master_get_devdata(master);
	memset(hw, 0, sizeof(struct s3c24xx_spi));

	hw->master = spi_master_get(master);
	hw->pdata = pdata = pdev->dev.platform_data;
	hw->dev = &pdev->dev;

	if (pdata == NULL) {
		dev_err(&pdev->dev, "No platform data supplied\n");
		err = -ENOENT;
		goto err_no_pdata;
	}

	platform_set_drvdata(pdev, hw);
	init_completion(&hw->done);

	/* setup the master state. */

	/* the spi->mode bits understood by this driver: */
	master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH;

	master->num_chipselect = hw->pdata->num_cs;
	master->bus_num = pdata->bus_num;

	/* setup the state for the bitbang driver */

	hw->bitbang.master         = hw->master;
	hw->bitbang.setup_transfer = s3c24xx_spi_setupxfer;
	hw->bitbang.chipselect     = s3c24xx_spi_chipsel;
	hw->bitbang.txrx_bufs      = s3c24xx_spi_txrx;
	hw->bitbang.master->setup  = s3c24xx_spi_setup;

	dev_dbg(hw->dev, "bitbang at %p\n", &hw->bitbang);

	/* find and map our resources */

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (res == NULL) {
		dev_err(&pdev->dev, "Cannot get IORESOURCE_MEM\n");
		err = -ENOENT;
		goto err_no_iores;
	}

	hw->ioarea = request_mem_region(res->start, resource_size(res),
					pdev->name);

	if (hw->ioarea == NULL) {
		dev_err(&pdev->dev, "Cannot reserve region\n");
		err = -ENXIO;
		goto err_no_iores;
	}

	hw->regs = ioremap(res->start, resource_size(res));
	if (hw->regs == NULL) {
		dev_err(&pdev->dev, "Cannot map IO\n");
		err = -ENXIO;
		goto err_no_iomap;
	}

	hw->irq = platform_get_irq(pdev, 0);
	if (hw->irq < 0) {
		dev_err(&pdev->dev, "No IRQ specified\n");
		err = -ENOENT;
		goto err_no_irq;
	}

	err = request_irq(hw->irq, s3c24xx_spi_irq, 0, pdev->name, hw);
	if (err) {
		dev_err(&pdev->dev, "Cannot claim IRQ\n");
		goto err_no_irq;
	}

	hw->clk = clk_get(&pdev->dev, "spi");
	if (IS_ERR(hw->clk)) {
		dev_err(&pdev->dev, "No clock for device\n");
		err = PTR_ERR(hw->clk);
		goto err_no_clk;
	}

	/* setup any gpio we can */

	if (!pdata->set_cs) {
		if (pdata->pin_cs < 0) {
			dev_err(&pdev->dev, "No chipselect pin\n");
			goto err_register;
		}

		err = gpio_request(pdata->pin_cs, dev_name(&pdev->dev));
		if (err) {
			dev_err(&pdev->dev, "Failed to get gpio for cs\n");
			goto err_register;
		}

		hw->set_cs = s3c24xx_spi_gpiocs;
		gpio_direction_output(pdata->pin_cs, 1);
	} else
		hw->set_cs = pdata->set_cs;

	s3c24xx_spi_initialsetup(hw);

	/* register our spi controller */

	err = spi_bitbang_start(&hw->bitbang);
	if (err) {
		dev_err(&pdev->dev, "Failed to register SPI master\n");
		goto err_register;
	}

	return 0;

 err_register:
	if (hw->set_cs == s3c24xx_spi_gpiocs)
		gpio_free(pdata->pin_cs);

	clk_disable(hw->clk);
	clk_put(hw->clk);

 err_no_clk:
	free_irq(hw->irq, hw);

 err_no_irq:
	iounmap(hw->regs);

 err_no_iomap:
	release_resource(hw->ioarea);
	kfree(hw->ioarea);

 err_no_iores:
 err_no_pdata:
	spi_master_put(hw->master);

 err_nomem:
	return err;
}

static int __exit s3c24xx_spi_remove(struct platform_device *dev)
{
	struct s3c24xx_spi *hw = platform_get_drvdata(dev);

	platform_set_drvdata(dev, NULL);

	spi_unregister_master(hw->master);

	clk_disable(hw->clk);
	clk_put(hw->clk);

	free_irq(hw->irq, hw);
	iounmap(hw->regs);

	if (hw->set_cs == s3c24xx_spi_gpiocs)
		gpio_free(hw->pdata->pin_cs);

	release_resource(hw->ioarea);
	kfree(hw->ioarea);

	spi_master_put(hw->master);
	return 0;
}


#ifdef CONFIG_PM

static int s3c24xx_spi_suspend(struct device *dev)
{
	struct s3c24xx_spi *hw = platform_get_drvdata(to_platform_device(dev));

	if (hw->pdata && hw->pdata->gpio_setup)
		hw->pdata->gpio_setup(hw->pdata, 0);

	clk_disable(hw->clk);
	return 0;
}

static int s3c24xx_spi_resume(struct device *dev)
{
	struct s3c24xx_spi *hw = platform_get_drvdata(to_platform_device(dev));

	s3c24xx_spi_initialsetup(hw);
	return 0;
}

static struct dev_pm_ops s3c24xx_spi_pmops = {
	.suspend	= s3c24xx_spi_suspend,
	.resume		= s3c24xx_spi_resume,
};

#define S3C24XX_SPI_PMOPS &s3c24xx_spi_pmops
#else
#define S3C24XX_SPI_PMOPS NULL
#endif /* CONFIG_PM */

MODULE_ALIAS("platform:s3c2410-spi");
static struct platform_driver s3c24xx_spi_driver = {
	.remove		= __exit_p(s3c24xx_spi_remove),
	.driver		= {
		.name	= "s3c2410-spi",
		.owner	= THIS_MODULE,
		.pm	= S3C24XX_SPI_PMOPS,
	},
};

static int __init s3c24xx_spi_init(void)
{
        return platform_driver_probe(&s3c24xx_spi_driver, s3c24xx_spi_probe);
}

static void __exit s3c24xx_spi_exit(void)
{
        platform_driver_unregister(&s3c24xx_spi_driver);
}

module_init(s3c24xx_spi_init);
module_exit(s3c24xx_spi_exit);

MODULE_DESCRIPTION("S3C24XX SPI Driver");
MODULE_AUTHOR("Ben Dooks, <ben@simtec.co.uk>");
MODULE_LICENSE("GPL");
Commit	Line	Data
7fba5340 BD	1	/* linux/drivers/spi/spi_s3c24xx.c
	2	*
	3	* Copyright (c) 2006 Ben Dooks
	4	* Copyright (c) 2006 Simtec Electronics
	5	* Ben Dooks <ben@simtec.co.uk>
	6	*
	7	* This program is free software; you can redistribute it and/or modify
	8	* it under the terms of the GNU General Public License version 2 as
	9	* published by the Free Software Foundation.
	10	*
	11	*/
	12
7fba5340 BD	13	#include <linux/init.h>
	14	#include <linux/spinlock.h>
	15	#include <linux/workqueue.h>
	16	#include <linux/interrupt.h>
	17	#include <linux/delay.h>
	18	#include <linux/errno.h>
	19	#include <linux/err.h>
	20	#include <linux/clk.h>
	21	#include <linux/platform_device.h>
ee9c1fbf	22	#include <linux/gpio.h>
1a0c220f	23	#include <linux/io.h>
7fba5340 BD	24
	25	#include <linux/spi/spi.h>
	26	#include <linux/spi/spi_bitbang.h>
	27
13622708	28	#include <plat/regs-spi.h>
a09e64fb	29	#include <mach/spi.h>
7fba5340 BD	30
	31	struct s3c24xx_spi {
	32	/* bitbang has to be first */
	33	struct spi_bitbang bitbang;
	34	struct completion done;
	35
	36	void __iomem *regs;
	37	int irq;
	38	int len;
	39	int count;
	40
6c912a3d	41	void (set_cs)(struct s3c2410_spi_info spi,
8736b927 BD	42	int cs, int pol);
8736b927 BD	43
7fba5340 BD	44	/* data buffers */
	45	const unsigned char *tx;
	46	unsigned char *rx;
	47
	48	struct clk *clk;
	49	struct resource *ioarea;
	50	struct spi_master *master;
	51	struct spi_device *curdev;
	52	struct device *dev;
	53	struct s3c2410_spi_info *pdata;
	54	};
	55
	56	#define SPCON_DEFAULT (S3C2410_SPCON_MSTR \| S3C2410_SPCON_SMOD_INT)
	57	#define SPPIN_DEFAULT (S3C2410_SPPIN_KEEP)
	58
	59	static inline struct s3c24xx_spi to_hw(struct spi_device sdev)
	60	{
	61	return spi_master_get_devdata(sdev->master);
	62	}
	63
8736b927 BD	64	static void s3c24xx_spi_gpiocs(struct s3c2410_spi_info *spi, int cs, int pol)
8736b927 BD	65	{
ee9c1fbf	66	gpio_set_value(spi->pin_cs, pol);
8736b927 BD	67	}
8736b927 BD	68
7fba5340 BD	69	static void s3c24xx_spi_chipsel(struct spi_device *spi, int value)
	70	{
	71	struct s3c24xx_spi *hw = to_hw(spi);
	72	unsigned int cspol = spi->mode & SPI_CS_HIGH ? 1 : 0;
	73	unsigned int spcon;
	74
	75	switch (value) {
	76	case BITBANG_CS_INACTIVE:
3d2c5b41	77	hw->set_cs(hw->pdata, spi->chip_select, cspol^1);
7fba5340 BD	78	break;
	79
	80	case BITBANG_CS_ACTIVE:
	81	spcon = readb(hw->regs + S3C2410_SPCON);
	82
	83	if (spi->mode & SPI_CPHA)
	84	spcon \|= S3C2410_SPCON_CPHA_FMTB;
	85	else
	86	spcon &= ~S3C2410_SPCON_CPHA_FMTB;
	87
	88	if (spi->mode & SPI_CPOL)
	89	spcon \|= S3C2410_SPCON_CPOL_HIGH;
	90	else
	91	spcon &= ~S3C2410_SPCON_CPOL_HIGH;
	92
	93	spcon \|= S3C2410_SPCON_ENSCK;
	94
	95	/* write new configration */
	96
	97	writeb(spcon, hw->regs + S3C2410_SPCON);
3d2c5b41	98	hw->set_cs(hw->pdata, spi->chip_select, cspol);
7fba5340 BD	99
7fba5340 BD	100	break;
7fba5340 BD	101	}
	102	}
	103
	104	static int s3c24xx_spi_setupxfer(struct spi_device *spi,
	105	struct spi_transfer *t)
	106	{
	107	struct s3c24xx_spi *hw = to_hw(spi);
	108	unsigned int bpw;
	109	unsigned int hz;
	110	unsigned int div;
b8978784	111	unsigned long clk;
7fba5340 BD	112
	113	bpw = t ? t->bits_per_word : spi->bits_per_word;
	114	hz = t ? t->speed_hz : spi->max_speed_hz;
	115
19152975 BD	116	if (!bpw)
	117	bpw = 8;
	118
	119	if (!hz)
	120	hz = spi->max_speed_hz;
	121
7fba5340 BD	122	if (bpw != 8) {
	123	dev_err(&spi->dev, "invalid bits-per-word (%d)\n", bpw);
	124	return -EINVAL;
	125	}
	126
b8978784 BD	127	clk = clk_get_rate(hw->clk);
b8978784 BD	128	div = DIV_ROUND_UP(clk, hz * 2) - 1;
7fba5340 BD	129
	130	if (div > 255)
	131	div = 255;
	132
b8978784 BD	133	dev_dbg(&spi->dev, "setting pre-scaler to %d (wanted %d, got %ld)\n",
	134	div, hz, clk / (2 * (div + 1)));
	135
	136
7fba5340 BD	137	writeb(div, hw->regs + S3C2410_SPPRE);
	138
	139	spin_lock(&hw->bitbang.lock);
	140	if (!hw->bitbang.busy) {
	141	hw->bitbang.chipselect(spi, BITBANG_CS_INACTIVE);
	142	/* need to ndelay for 0.5 clocktick ? */
	143	}
	144	spin_unlock(&hw->bitbang.lock);
	145
	146	return 0;
	147	}
	148
	149	static int s3c24xx_spi_setup(struct spi_device *spi)
	150	{
	151	int ret;
	152
7fba5340 BD	153	ret = s3c24xx_spi_setupxfer(spi, NULL);
	154	if (ret < 0) {
	155	dev_err(&spi->dev, "setupxfer returned %d\n", ret);
	156	return ret;
	157	}
	158
7fba5340 BD	159	return 0;
	160	}
	161
	162	static inline unsigned int hw_txbyte(struct s3c24xx_spi *hw, int count)
	163	{
4b1badf5	164	return hw->tx ? hw->tx[count] : 0;
7fba5340 BD	165	}
	166
	167	static int s3c24xx_spi_txrx(struct spi_device spi, struct spi_transfer t)
	168	{
	169	struct s3c24xx_spi *hw = to_hw(spi);
	170
	171	dev_dbg(&spi->dev, "txrx: tx %p, rx %p, len %d\n",
	172	t->tx_buf, t->rx_buf, t->len);
	173
	174	hw->tx = t->tx_buf;
	175	hw->rx = t->rx_buf;
	176	hw->len = t->len;
	177	hw->count = 0;
	178
4bb5eba0 BD	179	init_completion(&hw->done);
4bb5eba0 BD	180
7fba5340 BD	181	/* send the first byte */
7fba5340 BD	182	writeb(hw_txbyte(hw, 0), hw->regs + S3C2410_SPTDAT);
4bb5eba0	183
7fba5340 BD	184	wait_for_completion(&hw->done);
	185
	186	return hw->count;
	187	}
	188
7d12e780	189	static irqreturn_t s3c24xx_spi_irq(int irq, void *dev)
7fba5340 BD	190	{
	191	struct s3c24xx_spi *hw = dev;
	192	unsigned int spsta = readb(hw->regs + S3C2410_SPSTA);
	193	unsigned int count = hw->count;
	194
	195	if (spsta & S3C2410_SPSTA_DCOL) {
	196	dev_dbg(hw->dev, "data-collision\n");
	197	complete(&hw->done);
	198	goto irq_done;
	199	}
	200
	201	if (!(spsta & S3C2410_SPSTA_READY)) {
	202	dev_dbg(hw->dev, "spi not ready for tx?\n");
	203	complete(&hw->done);
	204	goto irq_done;
	205	}
	206
	207	hw->count++;
	208
	209	if (hw->rx)
	210	hw->rx[count] = readb(hw->regs + S3C2410_SPRDAT);
	211
	212	count++;
	213
	214	if (count < hw->len)
	215	writeb(hw_txbyte(hw, count), hw->regs + S3C2410_SPTDAT);
	216	else
	217	complete(&hw->done);
	218
	219	irq_done:
	220	return IRQ_HANDLED;
	221	}
	222
5aa6cf30 BD	223	static void s3c24xx_spi_initialsetup(struct s3c24xx_spi *hw)
	224	{
	225	/* for the moment, permanently enable the clock */
	226
	227	clk_enable(hw->clk);
	228
	229	/* program defaults into the registers */
	230
	231	writeb(0xff, hw->regs + S3C2410_SPPRE);
	232	writeb(SPPIN_DEFAULT, hw->regs + S3C2410_SPPIN);
	233	writeb(SPCON_DEFAULT, hw->regs + S3C2410_SPCON);
cf46b973	234
ee9c1fbf BD	235	if (hw->pdata) {
	236	if (hw->set_cs == s3c24xx_spi_gpiocs)
	237	gpio_direction_output(hw->pdata->pin_cs, 1);
	238
	239	if (hw->pdata->gpio_setup)
	240	hw->pdata->gpio_setup(hw->pdata, 1);
	241	}
5aa6cf30 BD	242	}
5aa6cf30 BD	243
d1e44d9c	244	static int __init s3c24xx_spi_probe(struct platform_device *pdev)
7fba5340	245	{
50f426b5	246	struct s3c2410_spi_info *pdata;
7fba5340 BD	247	struct s3c24xx_spi *hw;
7fba5340 BD	248	struct spi_master *master;
7fba5340 BD	249	struct resource *res;
7fba5340 BD	250	int err = 0;
7fba5340 BD	251
	252	master = spi_alloc_master(&pdev->dev, sizeof(struct s3c24xx_spi));
	253	if (master == NULL) {
	254	dev_err(&pdev->dev, "No memory for spi_master\n");
	255	err = -ENOMEM;
	256	goto err_nomem;
	257	}
	258
	259	hw = spi_master_get_devdata(master);
	260	memset(hw, 0, sizeof(struct s3c24xx_spi));
	261
	262	hw->master = spi_master_get(master);
50f426b5	263	hw->pdata = pdata = pdev->dev.platform_data;
7fba5340 BD	264	hw->dev = &pdev->dev;
7fba5340 BD	265
50f426b5	266	if (pdata == NULL) {
7fba5340 BD	267	dev_err(&pdev->dev, "No platform data supplied\n");
	268	err = -ENOENT;
	269	goto err_no_pdata;
	270	}
	271
	272	platform_set_drvdata(pdev, hw);
	273	init_completion(&hw->done);
	274
d1e77806 BD	275	/* setup the master state. */
d1e77806 BD	276
e7db06b5 DB	277	/* the spi->mode bits understood by this driver: */
	278	master->mode_bits = SPI_CPOL \| SPI_CPHA \| SPI_CS_HIGH;
	279
d1e77806	280	master->num_chipselect = hw->pdata->num_cs;
cb1d0a7a	281	master->bus_num = pdata->bus_num;
d1e77806	282
7fba5340 BD	283	/* setup the state for the bitbang driver */
	284
	285	hw->bitbang.master = hw->master;
	286	hw->bitbang.setup_transfer = s3c24xx_spi_setupxfer;
	287	hw->bitbang.chipselect = s3c24xx_spi_chipsel;
	288	hw->bitbang.txrx_bufs = s3c24xx_spi_txrx;
	289	hw->bitbang.master->setup = s3c24xx_spi_setup;
	290
	291	dev_dbg(hw->dev, "bitbang at %p\n", &hw->bitbang);
	292
	293	/* find and map our resources */
	294
	295	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	296	if (res == NULL) {
	297	dev_err(&pdev->dev, "Cannot get IORESOURCE_MEM\n");
	298	err = -ENOENT;
	299	goto err_no_iores;
	300	}
	301
b5e3afb5	302	hw->ioarea = request_mem_region(res->start, resource_size(res),
7fba5340 BD	303	pdev->name);
	304
	305	if (hw->ioarea == NULL) {
	306	dev_err(&pdev->dev, "Cannot reserve region\n");
	307	err = -ENXIO;
	308	goto err_no_iores;
	309	}
	310
b5e3afb5	311	hw->regs = ioremap(res->start, resource_size(res));
7fba5340 BD	312	if (hw->regs == NULL) {
	313	dev_err(&pdev->dev, "Cannot map IO\n");
	314	err = -ENXIO;
	315	goto err_no_iomap;
	316	}
	317
	318	hw->irq = platform_get_irq(pdev, 0);
	319	if (hw->irq < 0) {
	320	dev_err(&pdev->dev, "No IRQ specified\n");
	321	err = -ENOENT;
	322	goto err_no_irq;
	323	}
	324
	325	err = request_irq(hw->irq, s3c24xx_spi_irq, 0, pdev->name, hw);
	326	if (err) {
	327	dev_err(&pdev->dev, "Cannot claim IRQ\n");
	328	goto err_no_irq;
	329	}
	330
	331	hw->clk = clk_get(&pdev->dev, "spi");
	332	if (IS_ERR(hw->clk)) {
	333	dev_err(&pdev->dev, "No clock for device\n");
	334	err = PTR_ERR(hw->clk);
	335	goto err_no_clk;
	336	}
	337
7fba5340 BD	338	/* setup any gpio we can */
7fba5340 BD	339
50f426b5	340	if (!pdata->set_cs) {
ee9c1fbf BD	341	if (pdata->pin_cs < 0) {
	342	dev_err(&pdev->dev, "No chipselect pin\n");
	343	goto err_register;
	344	}
8736b927	345
ee9c1fbf BD	346	err = gpio_request(pdata->pin_cs, dev_name(&pdev->dev));
	347	if (err) {
	348	dev_err(&pdev->dev, "Failed to get gpio for cs\n");
	349	goto err_register;
	350	}
	351
	352	hw->set_cs = s3c24xx_spi_gpiocs;
	353	gpio_direction_output(pdata->pin_cs, 1);
8736b927	354	} else
50f426b5	355	hw->set_cs = pdata->set_cs;
7fba5340	356
ee9c1fbf BD	357	s3c24xx_spi_initialsetup(hw);
ee9c1fbf BD	358
7fba5340 BD	359	/* register our spi controller */
	360
	361	err = spi_bitbang_start(&hw->bitbang);
	362	if (err) {
	363	dev_err(&pdev->dev, "Failed to register SPI master\n");
	364	goto err_register;
	365	}
	366
7fba5340 BD	367	return 0;
	368
	369	err_register:
ee9c1fbf BD	370	if (hw->set_cs == s3c24xx_spi_gpiocs)
	371	gpio_free(pdata->pin_cs);
	372
7fba5340 BD	373	clk_disable(hw->clk);
	374	clk_put(hw->clk);
	375
	376	err_no_clk:
	377	free_irq(hw->irq, hw);
	378
	379	err_no_irq:
	380	iounmap(hw->regs);
	381
	382	err_no_iomap:
	383	release_resource(hw->ioarea);
	384	kfree(hw->ioarea);
	385
	386	err_no_iores:
	387	err_no_pdata:
a419aef8	388	spi_master_put(hw->master);
7fba5340 BD	389
	390	err_nomem:
	391	return err;
	392	}
	393
d1e44d9c	394	static int __exit s3c24xx_spi_remove(struct platform_device *dev)
7fba5340 BD	395	{
	396	struct s3c24xx_spi *hw = platform_get_drvdata(dev);
	397
	398	platform_set_drvdata(dev, NULL);
	399
	400	spi_unregister_master(hw->master);
	401
	402	clk_disable(hw->clk);
	403	clk_put(hw->clk);
	404
	405	free_irq(hw->irq, hw);
	406	iounmap(hw->regs);
	407
ee9c1fbf BD	408	if (hw->set_cs == s3c24xx_spi_gpiocs)
	409	gpio_free(hw->pdata->pin_cs);
	410
7fba5340 BD	411	release_resource(hw->ioarea);
	412	kfree(hw->ioarea);
	413
	414	spi_master_put(hw->master);
	415	return 0;
	416	}
	417
	418
	419	#ifdef CONFIG_PM
	420
6d613207	421	static int s3c24xx_spi_suspend(struct device *dev)
7fba5340	422	{
6d613207	423	struct s3c24xx_spi *hw = platform_get_drvdata(to_platform_device(dev));
7fba5340	424
cf46b973 BD	425	if (hw->pdata && hw->pdata->gpio_setup)
	426	hw->pdata->gpio_setup(hw->pdata, 0);
	427
7fba5340 BD	428	clk_disable(hw->clk);
	429	return 0;
	430	}
	431
6d613207	432	static int s3c24xx_spi_resume(struct device *dev)
7fba5340	433	{
6d613207	434	struct s3c24xx_spi *hw = platform_get_drvdata(to_platform_device(dev));
7fba5340	435
5aa6cf30	436	s3c24xx_spi_initialsetup(hw);
7fba5340 BD	437	return 0;
	438	}
	439
6d613207 BD	440	static struct dev_pm_ops s3c24xx_spi_pmops = {
	441	.suspend = s3c24xx_spi_suspend,
	442	.resume = s3c24xx_spi_resume,
	443	};
	444
	445	#define S3C24XX_SPI_PMOPS &s3c24xx_spi_pmops
7fba5340	446	#else
6d613207 BD	447	#define S3C24XX_SPI_PMOPS NULL
6d613207 BD	448	#endif /* CONFIG_PM */
7fba5340	449
7e38c3c4	450	MODULE_ALIAS("platform:s3c2410-spi");
42cde430	451	static struct platform_driver s3c24xx_spi_driver = {
d1e44d9c	452	.remove = __exit_p(s3c24xx_spi_remove),
7fba5340 BD	453	.driver = {
	454	.name = "s3c2410-spi",
	455	.owner = THIS_MODULE,
6d613207	456	.pm = S3C24XX_SPI_PMOPS,
7fba5340 BD	457	},
	458	};
	459
	460	static int __init s3c24xx_spi_init(void)
	461	{
42cde430	462	return platform_driver_probe(&s3c24xx_spi_driver, s3c24xx_spi_probe);
7fba5340 BD	463	}
	464
	465	static void __exit s3c24xx_spi_exit(void)
	466	{
42cde430	467	platform_driver_unregister(&s3c24xx_spi_driver);
7fba5340 BD	468	}
	469
	470	module_init(s3c24xx_spi_init);
	471	module_exit(s3c24xx_spi_exit);
	472
	473	MODULE_DESCRIPTION("S3C24XX SPI Driver");
	474	MODULE_AUTHOR("Ben Dooks, <ben@simtec.co.uk>");
	475	MODULE_LICENSE("GPL");