[deliverable/linux.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/spi/spi.h>
#include <linux/spi/spi_bitbang.h>

#include <asm/io.h>
#include <asm/dma.h>
#include <asm/hardware.h>

#include <asm/arch/regs-gpio.h>
#include <asm/arch/regs-spi.h>
#include <asm/arch/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)
{
	s3c2410_gpio_setpin(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;

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

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

	div = clk_get_rate(hw->clk) / hz;

	/* is clk = pclk / (2 * (pre+1)), or is it
	 *    clk = (pclk * 2) / ( pre + 1) */

	div = (div / 2) - 1;

	if (div < 0)
		div = 1;

	if (div > 255)
		div = 255;

	dev_dbg(&spi->dev, "setting pre-scaler to %d (hz %d)\n", div, hz);
	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;

	if (!spi->bits_per_word)
		spi->bits_per_word = 8;

	if ((spi->mode & SPI_LSB_FIRST) != 0)
		return -EINVAL;

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

	dev_dbg(&spi->dev, "%s: mode %d, %u bpw, %d hz\n",
		__FUNCTION__, spi->mode, spi->bits_per_word,
		spi->max_speed_hz);

	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;

	/* 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 int s3c24xx_spi_probe(struct platform_device *pdev)
{
	struct s3c24xx_spi *hw;
	struct spi_master *master;
	struct spi_board_info *bi;
	struct resource *res;
	int err = 0;
	int i;

	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 = pdev->dev.platform_data;
	hw->dev = &pdev->dev;

	if (hw->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 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, (res->end - res->start)+1,
					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, (res->end - res->start)+1);
	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;
	}

	/* 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);

	/* setup any gpio we can */

	if (!hw->pdata->set_cs) {
		hw->set_cs = s3c24xx_spi_gpiocs;

		s3c2410_gpio_setpin(hw->pdata->pin_cs, 1);
		s3c2410_gpio_cfgpin(hw->pdata->pin_cs, S3C2410_GPIO_OUTPUT);
	} else
		hw->set_cs = hw->pdata->set_cs;

	/* 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;
	}

	/* register all the devices associated */

	bi = &hw->pdata->board_info[0];
	for (i = 0; i < hw->pdata->board_size; i++, bi++) {
		dev_info(hw->dev, "registering %s\n", bi->modalias);

		bi->controller_data = hw;
		spi_new_device(master, bi);
	}

	return 0;

 err_register:
	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 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);

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

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


#ifdef CONFIG_PM

static int s3c24xx_spi_suspend(struct platform_device *pdev, pm_message_t msg)
{
	struct s3c24xx_spi *hw = platform_get_drvdata(pdev);

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

static int s3c24xx_spi_resume(struct platform_device *pdev)
{
	struct s3c24xx_spi *hw = platform_get_drvdata(pdev);

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

#else
#define s3c24xx_spi_suspend NULL
#define s3c24xx_spi_resume  NULL
#endif

static struct platform_driver s3c24xx_spidrv = {
	.probe		= s3c24xx_spi_probe,
	.remove		= s3c24xx_spi_remove,
	.suspend	= s3c24xx_spi_suspend,
	.resume		= s3c24xx_spi_resume,
	.driver		= {
		.name	= "s3c2410-spi",
		.owner	= THIS_MODULE,
	},
};

static int __init s3c24xx_spi_init(void)
{
        return platform_driver_register(&s3c24xx_spidrv);
}

static void __exit s3c24xx_spi_exit(void)
{
        platform_driver_unregister(&s3c24xx_spidrv);
}

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>
	22
	23	#include <linux/spi/spi.h>
	24	#include <linux/spi/spi_bitbang.h>
	25
	26	#include <asm/io.h>
	27	#include <asm/dma.h>
	28	#include <asm/hardware.h>
	29
	30	#include <asm/arch/regs-gpio.h>
	31	#include <asm/arch/regs-spi.h>
	32	#include <asm/arch/spi.h>
	33
	34	struct s3c24xx_spi {
	35	/* bitbang has to be first */
	36	struct spi_bitbang bitbang;
	37	struct completion done;
	38
	39	void __iomem *regs;
	40	int irq;
	41	int len;
	42	int count;
	43
6c912a3d	44	void (set_cs)(struct s3c2410_spi_info spi,
8736b927 BD	45	int cs, int pol);
8736b927 BD	46
7fba5340 BD	47	/* data buffers */
	48	const unsigned char *tx;
	49	unsigned char *rx;
	50
	51	struct clk *clk;
	52	struct resource *ioarea;
	53	struct spi_master *master;
	54	struct spi_device *curdev;
	55	struct device *dev;
	56	struct s3c2410_spi_info *pdata;
	57	};
	58
	59	#define SPCON_DEFAULT (S3C2410_SPCON_MSTR \| S3C2410_SPCON_SMOD_INT)
	60	#define SPPIN_DEFAULT (S3C2410_SPPIN_KEEP)
	61
	62	static inline struct s3c24xx_spi to_hw(struct spi_device sdev)
	63	{
	64	return spi_master_get_devdata(sdev->master);
	65	}
	66
8736b927 BD	67	static void s3c24xx_spi_gpiocs(struct s3c2410_spi_info *spi, int cs, int pol)
	68	{
	69	s3c2410_gpio_setpin(spi->pin_cs, pol);
	70	}
	71
7fba5340 BD	72	static void s3c24xx_spi_chipsel(struct spi_device *spi, int value)
	73	{
	74	struct s3c24xx_spi *hw = to_hw(spi);
	75	unsigned int cspol = spi->mode & SPI_CS_HIGH ? 1 : 0;
	76	unsigned int spcon;
	77
	78	switch (value) {
	79	case BITBANG_CS_INACTIVE:
3d2c5b41	80	hw->set_cs(hw->pdata, spi->chip_select, cspol^1);
7fba5340 BD	81	break;
	82
	83	case BITBANG_CS_ACTIVE:
	84	spcon = readb(hw->regs + S3C2410_SPCON);
	85
	86	if (spi->mode & SPI_CPHA)
	87	spcon \|= S3C2410_SPCON_CPHA_FMTB;
	88	else
	89	spcon &= ~S3C2410_SPCON_CPHA_FMTB;
	90
	91	if (spi->mode & SPI_CPOL)
	92	spcon \|= S3C2410_SPCON_CPOL_HIGH;
	93	else
	94	spcon &= ~S3C2410_SPCON_CPOL_HIGH;
	95
	96	spcon \|= S3C2410_SPCON_ENSCK;
	97
	98	/* write new configration */
	99
	100	writeb(spcon, hw->regs + S3C2410_SPCON);
3d2c5b41	101	hw->set_cs(hw->pdata, spi->chip_select, cspol);
7fba5340 BD	102
7fba5340 BD	103	break;
7fba5340 BD	104	}
	105	}
	106
	107	static int s3c24xx_spi_setupxfer(struct spi_device *spi,
	108	struct spi_transfer *t)
	109	{
	110	struct s3c24xx_spi *hw = to_hw(spi);
	111	unsigned int bpw;
	112	unsigned int hz;
	113	unsigned int div;
	114
	115	bpw = t ? t->bits_per_word : spi->bits_per_word;
	116	hz = t ? t->speed_hz : spi->max_speed_hz;
	117
	118	if (bpw != 8) {
	119	dev_err(&spi->dev, "invalid bits-per-word (%d)\n", bpw);
	120	return -EINVAL;
	121	}
	122
	123	div = clk_get_rate(hw->clk) / hz;
	124
	125	/* is clk = pclk / (2 * (pre+1)), or is it
	126	* clk = (pclk * 2) / ( pre + 1) */
	127
	128	div = (div / 2) - 1;
	129
	130	if (div < 0)
	131	div = 1;
	132
	133	if (div > 255)
	134	div = 255;
	135
	136	dev_dbg(&spi->dev, "setting pre-scaler to %d (hz %d)\n", div, hz);
	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
	153	if (!spi->bits_per_word)
	154	spi->bits_per_word = 8;
	155
	156	if ((spi->mode & SPI_LSB_FIRST) != 0)
	157	return -EINVAL;
	158
	159	ret = s3c24xx_spi_setupxfer(spi, NULL);
	160	if (ret < 0) {
	161	dev_err(&spi->dev, "setupxfer returned %d\n", ret);
	162	return ret;
	163	}
	164
	165	dev_dbg(&spi->dev, "%s: mode %d, %u bpw, %d hz\n",
	166	__FUNCTION__, spi->mode, spi->bits_per_word,
	167	spi->max_speed_hz);
168
169	return 0;
170	}
171
172	static inline unsigned int hw_txbyte(struct s3c24xx_spi *hw, int count)
173	{
4b1badf5	174	return hw->tx ? hw->tx[count] : 0;
7fba5340 BD	175	}
	176
	177	static int s3c24xx_spi_txrx(struct spi_device spi, struct spi_transfer t)
	178	{
	179	struct s3c24xx_spi *hw = to_hw(spi);
	180
	181	dev_dbg(&spi->dev, "txrx: tx %p, rx %p, len %d\n",
	182	t->tx_buf, t->rx_buf, t->len);
	183
	184	hw->tx = t->tx_buf;
	185	hw->rx = t->rx_buf;
	186	hw->len = t->len;
	187	hw->count = 0;
	188
	189	/* send the first byte */
	190	writeb(hw_txbyte(hw, 0), hw->regs + S3C2410_SPTDAT);
	191	wait_for_completion(&hw->done);
	192
	193	return hw->count;
	194	}
	195
7d12e780	196	static irqreturn_t s3c24xx_spi_irq(int irq, void *dev)
7fba5340 BD	197	{
	198	struct s3c24xx_spi *hw = dev;
	199	unsigned int spsta = readb(hw->regs + S3C2410_SPSTA);
	200	unsigned int count = hw->count;
	201
	202	if (spsta & S3C2410_SPSTA_DCOL) {
	203	dev_dbg(hw->dev, "data-collision\n");
	204	complete(&hw->done);
	205	goto irq_done;
	206	}
	207
	208	if (!(spsta & S3C2410_SPSTA_READY)) {
	209	dev_dbg(hw->dev, "spi not ready for tx?\n");
	210	complete(&hw->done);
	211	goto irq_done;
	212	}
	213
	214	hw->count++;
	215
	216	if (hw->rx)
	217	hw->rx[count] = readb(hw->regs + S3C2410_SPRDAT);
	218
	219	count++;
	220
	221	if (count < hw->len)
	222	writeb(hw_txbyte(hw, count), hw->regs + S3C2410_SPTDAT);
	223	else
	224	complete(&hw->done);
	225
	226	irq_done:
	227	return IRQ_HANDLED;
	228	}
	229
	230	static int s3c24xx_spi_probe(struct platform_device *pdev)
	231	{
	232	struct s3c24xx_spi *hw;
	233	struct spi_master *master;
	234	struct spi_board_info *bi;
	235	struct resource *res;
	236	int err = 0;
	237	int i;
	238
	239	master = spi_alloc_master(&pdev->dev, sizeof(struct s3c24xx_spi));
	240	if (master == NULL) {
	241	dev_err(&pdev->dev, "No memory for spi_master\n");
	242	err = -ENOMEM;
	243	goto err_nomem;
	244	}
	245
	246	hw = spi_master_get_devdata(master);
	247	memset(hw, 0, sizeof(struct s3c24xx_spi));
	248
	249	hw->master = spi_master_get(master);
	250	hw->pdata = pdev->dev.platform_data;
	251	hw->dev = &pdev->dev;
	252
	253	if (hw->pdata == NULL) {
	254	dev_err(&pdev->dev, "No platform data supplied\n");
	255	err = -ENOENT;
	256	goto err_no_pdata;
	257	}
	258
	259	platform_set_drvdata(pdev, hw);
	260	init_completion(&hw->done);
261
262	/* setup the state for the bitbang driver */
263
264	hw->bitbang.master = hw->master;
265	hw->bitbang.setup_transfer = s3c24xx_spi_setupxfer;
266	hw->bitbang.chipselect = s3c24xx_spi_chipsel;
267	hw->bitbang.txrx_bufs = s3c24xx_spi_txrx;
268	hw->bitbang.master->setup = s3c24xx_spi_setup;
269
270	dev_dbg(hw->dev, "bitbang at %p\n", &hw->bitbang);
271
272	/* find and map our resources */
273
274	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
275	if (res == NULL) {
276	dev_err(&pdev->dev, "Cannot get IORESOURCE_MEM\n");
277	err = -ENOENT;
278	goto err_no_iores;
279	}
280
281	hw->ioarea = request_mem_region(res->start, (res->end - res->start)+1,
282	pdev->name);
283
284	if (hw->ioarea == NULL) {
285	dev_err(&pdev->dev, "Cannot reserve region\n");
286	err = -ENXIO;
287	goto err_no_iores;
288	}
289
290	hw->regs = ioremap(res->start, (res->end - res->start)+1);
291	if (hw->regs == NULL) {
292	dev_err(&pdev->dev, "Cannot map IO\n");
293	err = -ENXIO;
294	goto err_no_iomap;
295	}
296
297	hw->irq = platform_get_irq(pdev, 0);
298	if (hw->irq < 0) {
299	dev_err(&pdev->dev, "No IRQ specified\n");
300	err = -ENOENT;
301	goto err_no_irq;
302	}
303
304	err = request_irq(hw->irq, s3c24xx_spi_irq, 0, pdev->name, hw);
305	if (err) {
306	dev_err(&pdev->dev, "Cannot claim IRQ\n");
307	goto err_no_irq;
308	}
309
310	hw->clk = clk_get(&pdev->dev, "spi");
311	if (IS_ERR(hw->clk)) {
312	dev_err(&pdev->dev, "No clock for device\n");
313	err = PTR_ERR(hw->clk);
314	goto err_no_clk;
315	}
316
317	/* for the moment, permanently enable the clock */
318
319	clk_enable(hw->clk);
320
321	/* program defaults into the registers */
322
323	writeb(0xff, hw->regs + S3C2410_SPPRE);
324	writeb(SPPIN_DEFAULT, hw->regs + S3C2410_SPPIN);
325	writeb(SPCON_DEFAULT, hw->regs + S3C2410_SPCON);
326
327	/* setup any gpio we can */
328
329	if (!hw->pdata->set_cs) {
8736b927 BD	330	hw->set_cs = s3c24xx_spi_gpiocs;
8736b927 BD	331
7fba5340 BD	332	s3c2410_gpio_setpin(hw->pdata->pin_cs, 1);
7fba5340 BD	333	s3c2410_gpio_cfgpin(hw->pdata->pin_cs, S3C2410_GPIO_OUTPUT);
8736b927 BD	334	} else
8736b927 BD	335	hw->set_cs = hw->pdata->set_cs;
7fba5340 BD	336
	337	/* register our spi controller */
	338
	339	err = spi_bitbang_start(&hw->bitbang);
	340	if (err) {
	341	dev_err(&pdev->dev, "Failed to register SPI master\n");
	342	goto err_register;
	343	}
	344
7fba5340 BD	345	/* register all the devices associated */
	346
	347	bi = &hw->pdata->board_info[0];
	348	for (i = 0; i < hw->pdata->board_size; i++, bi++) {
	349	dev_info(hw->dev, "registering %s\n", bi->modalias);
	350
	351	bi->controller_data = hw;
	352	spi_new_device(master, bi);
	353	}
	354
	355	return 0;
	356
	357	err_register:
	358	clk_disable(hw->clk);
	359	clk_put(hw->clk);
	360
	361	err_no_clk:
	362	free_irq(hw->irq, hw);
	363
	364	err_no_irq:
	365	iounmap(hw->regs);
	366
	367	err_no_iomap:
	368	release_resource(hw->ioarea);
	369	kfree(hw->ioarea);
	370
	371	err_no_iores:
	372	err_no_pdata:
	373	spi_master_put(hw->master);;
	374
	375	err_nomem:
	376	return err;
	377	}
	378
	379	static int s3c24xx_spi_remove(struct platform_device *dev)
	380	{
	381	struct s3c24xx_spi *hw = platform_get_drvdata(dev);
	382
	383	platform_set_drvdata(dev, NULL);
	384
	385	spi_unregister_master(hw->master);
	386
	387	clk_disable(hw->clk);
	388	clk_put(hw->clk);
	389
	390	free_irq(hw->irq, hw);
	391	iounmap(hw->regs);
	392
	393	release_resource(hw->ioarea);
	394	kfree(hw->ioarea);
	395
	396	spi_master_put(hw->master);
	397	return 0;
	398	}
	399
	400
	401	#ifdef CONFIG_PM
	402
	403	static int s3c24xx_spi_suspend(struct platform_device *pdev, pm_message_t msg)
	404	{
ac88bcff	405	struct s3c24xx_spi *hw = platform_get_drvdata(pdev);
7fba5340 BD	406
	407	clk_disable(hw->clk);
	408	return 0;
	409	}
	410
	411	static int s3c24xx_spi_resume(struct platform_device *pdev)
	412	{
ac88bcff	413	struct s3c24xx_spi *hw = platform_get_drvdata(pdev);
7fba5340 BD	414
	415	clk_enable(hw->clk);
	416	return 0;
	417	}
	418
	419	#else
	420	#define s3c24xx_spi_suspend NULL
	421	#define s3c24xx_spi_resume NULL
	422	#endif
	423
	424	static struct platform_driver s3c24xx_spidrv = {
	425	.probe = s3c24xx_spi_probe,
	426	.remove = s3c24xx_spi_remove,
	427	.suspend = s3c24xx_spi_suspend,
	428	.resume = s3c24xx_spi_resume,
	429	.driver = {
	430	.name = "s3c2410-spi",
	431	.owner = THIS_MODULE,
	432	},
	433	};
	434
	435	static int __init s3c24xx_spi_init(void)
	436	{
	437	return platform_driver_register(&s3c24xx_spidrv);
	438	}
	439
	440	static void __exit s3c24xx_spi_exit(void)
	441	{
	442	platform_driver_unregister(&s3c24xx_spidrv);
	443	}
	444
	445	module_init(s3c24xx_spi_init);
	446	module_exit(s3c24xx_spi_exit);
	447
	448	MODULE_DESCRIPTION("S3C24XX SPI Driver");
	449	MODULE_AUTHOR("Ben Dooks, <ben@simtec.co.uk>");
	450	MODULE_LICENSE("GPL");