[linux.git] / drivers / spi / spi-nuc900.c

/*
 * Copyright (c) 2009 Nuvoton technology.
 * Wan ZongShun <[email protected]>
 *
 * 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/device.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 <mach/nuc900_spi.h>

/* usi registers offset */
#define USI_CNT		0x00
#define USI_DIV		0x04
#define USI_SSR		0x08
#define USI_RX0		0x10
#define USI_TX0		0x10

/* usi register bit */
#define ENINT		(0x01 << 17)
#define ENFLG		(0x01 << 16)
#define TXNUM		(0x03 << 8)
#define TXNEG		(0x01 << 2)
#define RXNEG		(0x01 << 1)
#define LSB		(0x01 << 10)
#define SELECTLEV	(0x01 << 2)
#define SELECTPOL	(0x01 << 31)
#define SELECTSLAVE	0x01
#define GOBUSY		0x01

struct nuc900_spi {
	struct spi_bitbang	 bitbang;
	struct completion	 done;
	void __iomem		*regs;
	int			 irq;
	int			 len;
	int			 count;
	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 nuc900_spi_info *pdata;
	spinlock_t		lock;
	struct resource		*res;
};

static inline struct nuc900_spi *to_hw(struct spi_device *sdev)
{
	return spi_master_get_devdata(sdev->master);
}

static void nuc900_slave_select(struct spi_device *spi, unsigned int ssr)
{
	struct nuc900_spi *hw = to_hw(spi);
	unsigned int val;
	unsigned int cs = spi->mode & SPI_CS_HIGH ? 1 : 0;
	unsigned int cpol = spi->mode & SPI_CPOL ? 1 : 0;
	unsigned long flags;

	spin_lock_irqsave(&hw->lock, flags);

	val = __raw_readl(hw->regs + USI_SSR);

	if (!cs)
		val &= ~SELECTLEV;
	else
		val |= SELECTLEV;

	if (!ssr)
		val &= ~SELECTSLAVE;
	else
		val |= SELECTSLAVE;

	__raw_writel(val, hw->regs + USI_SSR);

	val = __raw_readl(hw->regs + USI_CNT);

	if (!cpol)
		val &= ~SELECTPOL;
	else
		val |= SELECTPOL;

	__raw_writel(val, hw->regs + USI_CNT);

	spin_unlock_irqrestore(&hw->lock, flags);
}

static void nuc900_spi_chipsel(struct spi_device *spi, int value)
{
	switch (value) {
	case BITBANG_CS_INACTIVE:
		nuc900_slave_select(spi, 0);
		break;

	case BITBANG_CS_ACTIVE:
		nuc900_slave_select(spi, 1);
		break;
	}
}

static void nuc900_spi_setup_txnum(struct nuc900_spi *hw,
							unsigned int txnum)
{
	unsigned int val;
	unsigned long flags;

	spin_lock_irqsave(&hw->lock, flags);

	val = __raw_readl(hw->regs + USI_CNT);

	if (!txnum)
		val &= ~TXNUM;
	else
		val |= txnum << 0x08;

	__raw_writel(val, hw->regs + USI_CNT);

	spin_unlock_irqrestore(&hw->lock, flags);

}

static void nuc900_spi_setup_txbitlen(struct nuc900_spi *hw,
							unsigned int txbitlen)
{
	unsigned int val;
	unsigned long flags;

	spin_lock_irqsave(&hw->lock, flags);

	val = __raw_readl(hw->regs + USI_CNT);

	val |= (txbitlen << 0x03);

	__raw_writel(val, hw->regs + USI_CNT);

	spin_unlock_irqrestore(&hw->lock, flags);
}

static void nuc900_spi_gobusy(struct nuc900_spi *hw)
{
	unsigned int val;
	unsigned long flags;

	spin_lock_irqsave(&hw->lock, flags);

	val = __raw_readl(hw->regs + USI_CNT);

	val |= GOBUSY;

	__raw_writel(val, hw->regs + USI_CNT);

	spin_unlock_irqrestore(&hw->lock, flags);
}

static int nuc900_spi_setupxfer(struct spi_device *spi,
				 struct spi_transfer *t)
{
	return 0;
}

static int nuc900_spi_setup(struct spi_device *spi)
{
	return 0;
}

static inline unsigned int hw_txbyte(struct nuc900_spi *hw, int count)
{
	return hw->tx ? hw->tx[count] : 0;
}

static int nuc900_spi_txrx(struct spi_device *spi, struct spi_transfer *t)
{
	struct nuc900_spi *hw = to_hw(spi);

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

	__raw_writel(hw_txbyte(hw, 0x0), hw->regs + USI_TX0);

	nuc900_spi_gobusy(hw);

	wait_for_completion(&hw->done);

	return hw->count;
}

static irqreturn_t nuc900_spi_irq(int irq, void *dev)
{
	struct nuc900_spi *hw = dev;
	unsigned int status;
	unsigned int count = hw->count;

	status = __raw_readl(hw->regs + USI_CNT);
	__raw_writel(status, hw->regs + USI_CNT);

	if (status & ENFLG) {
		hw->count++;

		if (hw->rx)
			hw->rx[count] = __raw_readl(hw->regs + USI_RX0);
		count++;

		if (count < hw->len) {
			__raw_writel(hw_txbyte(hw, count), hw->regs + USI_TX0);
			nuc900_spi_gobusy(hw);
		} else {
			complete(&hw->done);
		}

		return IRQ_HANDLED;
	}

	complete(&hw->done);
	return IRQ_HANDLED;
}

static void nuc900_tx_edge(struct nuc900_spi *hw, unsigned int edge)
{
	unsigned int val;
	unsigned long flags;

	spin_lock_irqsave(&hw->lock, flags);

	val = __raw_readl(hw->regs + USI_CNT);

	if (edge)
		val |= TXNEG;
	else
		val &= ~TXNEG;
	__raw_writel(val, hw->regs + USI_CNT);

	spin_unlock_irqrestore(&hw->lock, flags);
}

static void nuc900_rx_edge(struct nuc900_spi *hw, unsigned int edge)
{
	unsigned int val;
	unsigned long flags;

	spin_lock_irqsave(&hw->lock, flags);

	val = __raw_readl(hw->regs + USI_CNT);

	if (edge)
		val |= RXNEG;
	else
		val &= ~RXNEG;
	__raw_writel(val, hw->regs + USI_CNT);

	spin_unlock_irqrestore(&hw->lock, flags);
}

static void nuc900_send_first(struct nuc900_spi *hw, unsigned int lsb)
{
	unsigned int val;
	unsigned long flags;

	spin_lock_irqsave(&hw->lock, flags);

	val = __raw_readl(hw->regs + USI_CNT);

	if (lsb)
		val |= LSB;
	else
		val &= ~LSB;
	__raw_writel(val, hw->regs + USI_CNT);

	spin_unlock_irqrestore(&hw->lock, flags);
}

static void nuc900_set_sleep(struct nuc900_spi *hw, unsigned int sleep)
{
	unsigned int val;
	unsigned long flags;

	spin_lock_irqsave(&hw->lock, flags);

	val = __raw_readl(hw->regs + USI_CNT);

	if (sleep)
		val |= (sleep << 12);
	else
		val &= ~(0x0f << 12);
	__raw_writel(val, hw->regs + USI_CNT);

	spin_unlock_irqrestore(&hw->lock, flags);
}

static void nuc900_enable_int(struct nuc900_spi *hw)
{
	unsigned int val;
	unsigned long flags;

	spin_lock_irqsave(&hw->lock, flags);

	val = __raw_readl(hw->regs + USI_CNT);

	val |= ENINT;

	__raw_writel(val, hw->regs + USI_CNT);

	spin_unlock_irqrestore(&hw->lock, flags);
}

static void nuc900_set_divider(struct nuc900_spi *hw)
{
	__raw_writel(hw->pdata->divider, hw->regs + USI_DIV);
}

static void nuc900_init_spi(struct nuc900_spi *hw)
{
	clk_enable(hw->clk);
	spin_lock_init(&hw->lock);

	nuc900_tx_edge(hw, hw->pdata->txneg);
	nuc900_rx_edge(hw, hw->pdata->rxneg);
	nuc900_send_first(hw, hw->pdata->lsb);
	nuc900_set_sleep(hw, hw->pdata->sleep);
	nuc900_spi_setup_txbitlen(hw, hw->pdata->txbitlen);
	nuc900_spi_setup_txnum(hw, hw->pdata->txnum);
	nuc900_set_divider(hw);
	nuc900_enable_int(hw);
}

static int __devinit nuc900_spi_probe(struct platform_device *pdev)
{
	struct nuc900_spi *hw;
	struct spi_master *master;
	int err = 0;

	master = spi_alloc_master(&pdev->dev, sizeof(struct nuc900_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 nuc900_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_pdata;
	}

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

	master->mode_bits          = SPI_MODE_0;
	master->num_chipselect     = hw->pdata->num_cs;
	master->bus_num            = hw->pdata->bus_num;
	hw->bitbang.master         = hw->master;
	hw->bitbang.setup_transfer = nuc900_spi_setupxfer;
	hw->bitbang.chipselect     = nuc900_spi_chipsel;
	hw->bitbang.txrx_bufs      = nuc900_spi_txrx;
	hw->bitbang.master->setup  = nuc900_spi_setup;

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

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

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

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

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

	err = request_irq(hw->irq, nuc900_spi_irq, 0, pdev->name, hw);
	if (err) {
		dev_err(&pdev->dev, "Cannot claim IRQ\n");
		goto err_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_clk;
	}

	mfp_set_groupg(&pdev->dev);
	nuc900_init_spi(hw);

	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:
	clk_disable(hw->clk);
	clk_put(hw->clk);
err_clk:
	free_irq(hw->irq, hw);
err_irq:
	iounmap(hw->regs);
err_iomap:
	release_mem_region(hw->res->start, resource_size(hw->res));
	kfree(hw->ioarea);
err_pdata:
	spi_master_put(hw->master);

err_nomem:
	return err;
}

static int __devexit nuc900_spi_remove(struct platform_device *dev)
{
	struct nuc900_spi *hw = platform_get_drvdata(dev);

	free_irq(hw->irq, hw);

	platform_set_drvdata(dev, NULL);

	spi_bitbang_stop(&hw->bitbang);

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

	iounmap(hw->regs);

	release_mem_region(hw->res->start, resource_size(hw->res));
	kfree(hw->ioarea);

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

static struct platform_driver nuc900_spi_driver = {
	.probe		= nuc900_spi_probe,
	.remove		= __devexit_p(nuc900_spi_remove),
	.driver		= {
		.name	= "nuc900-spi",
		.owner	= THIS_MODULE,
	},
};

static int __init nuc900_spi_init(void)
{
	return platform_driver_register(&nuc900_spi_driver);
}

static void __exit nuc900_spi_exit(void)
{
	platform_driver_unregister(&nuc900_spi_driver);
}

module_init(nuc900_spi_init);
module_exit(nuc900_spi_exit);

MODULE_AUTHOR("Wan ZongShun <[email protected]>");
MODULE_DESCRIPTION("nuc900 spi driver!");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:nuc900-spi");
Commit	Line	Data
ca632f55	1	/*
30eaed05 WZ	2	* Copyright (c) 2009 Nuvoton technology.
	3	* Wan ZongShun <[email protected]>
	4	*
	5	* This program is free software; you can redistribute it and/or modify
	6	* it under the terms of the GNU General Public License version 2 as
	7	* published by the Free Software Foundation.
	8	*
ca632f55	9	*/
30eaed05 WZ	10
	11	#include <linux/init.h>
	12	#include <linux/spinlock.h>
	13	#include <linux/workqueue.h>
	14	#include <linux/interrupt.h>
	15	#include <linux/delay.h>
	16	#include <linux/errno.h>
	17	#include <linux/err.h>
	18	#include <linux/clk.h>
	19	#include <linux/device.h>
	20	#include <linux/platform_device.h>
	21	#include <linux/gpio.h>
	22	#include <linux/io.h>
5a0e3ad6	23	#include <linux/slab.h>
30eaed05 WZ	24
	25	#include <linux/spi/spi.h>
	26	#include <linux/spi/spi_bitbang.h>
	27
	28	#include <mach/nuc900_spi.h>
	29
	30	/* usi registers offset */
	31	#define USI_CNT 0x00
	32	#define USI_DIV 0x04
	33	#define USI_SSR 0x08
	34	#define USI_RX0 0x10
	35	#define USI_TX0 0x10
	36
	37	/* usi register bit */
	38	#define ENINT (0x01 << 17)
	39	#define ENFLG (0x01 << 16)
	40	#define TXNUM (0x03 << 8)
	41	#define TXNEG (0x01 << 2)
	42	#define RXNEG (0x01 << 1)
	43	#define LSB (0x01 << 10)
	44	#define SELECTLEV (0x01 << 2)
	45	#define SELECTPOL (0x01 << 31)
	46	#define SELECTSLAVE 0x01
	47	#define GOBUSY 0x01
	48
	49	struct nuc900_spi {
	50	struct spi_bitbang bitbang;
	51	struct completion done;
	52	void __iomem *regs;
	53	int irq;
	54	int len;
	55	int count;
	56	const unsigned char *tx;
	57	unsigned char *rx;
	58	struct clk *clk;
	59	struct resource *ioarea;
	60	struct spi_master *master;
	61	struct spi_device *curdev;
	62	struct device *dev;
	63	struct nuc900_spi_info *pdata;
	64	spinlock_t lock;
	65	struct resource *res;
	66	};
	67
	68	static inline struct nuc900_spi to_hw(struct spi_device sdev)
	69	{
	70	return spi_master_get_devdata(sdev->master);
	71	}
	72
	73	static void nuc900_slave_select(struct spi_device *spi, unsigned int ssr)
	74	{
	75	struct nuc900_spi *hw = to_hw(spi);
	76	unsigned int val;
	77	unsigned int cs = spi->mode & SPI_CS_HIGH ? 1 : 0;
	78	unsigned int cpol = spi->mode & SPI_CPOL ? 1 : 0;
	79	unsigned long flags;
	80
	81	spin_lock_irqsave(&hw->lock, flags);
	82
	83	val = __raw_readl(hw->regs + USI_SSR);
	84
	85	if (!cs)
	86	val &= ~SELECTLEV;
	87	else
88	val \|= SELECTLEV;
89
90	if (!ssr)
91	val &= ~SELECTSLAVE;
92	else
93	val \|= SELECTSLAVE;
94
95	__raw_writel(val, hw->regs + USI_SSR);
96
97	val = __raw_readl(hw->regs + USI_CNT);
98
99	if (!cpol)
100	val &= ~SELECTPOL;
101	else
102	val \|= SELECTPOL;
103
104	__raw_writel(val, hw->regs + USI_CNT);
105
106	spin_unlock_irqrestore(&hw->lock, flags);
107	}
108
109	static void nuc900_spi_chipsel(struct spi_device *spi, int value)
110	{
111	switch (value) {
112	case BITBANG_CS_INACTIVE:
113	nuc900_slave_select(spi, 0);
114	break;
115
116	case BITBANG_CS_ACTIVE:
117	nuc900_slave_select(spi, 1);
118	break;
119	}
120	}
121
122	static void nuc900_spi_setup_txnum(struct nuc900_spi *hw,
123	unsigned int txnum)
124	{
125	unsigned int val;
126	unsigned long flags;
127
128	spin_lock_irqsave(&hw->lock, flags);
129
130	val = __raw_readl(hw->regs + USI_CNT);
131
132	if (!txnum)
133	val &= ~TXNUM;
134	else
135	val \|= txnum << 0x08;
136
137	__raw_writel(val, hw->regs + USI_CNT);
138
139	spin_unlock_irqrestore(&hw->lock, flags);
140
141	}
142
143	static void nuc900_spi_setup_txbitlen(struct nuc900_spi *hw,
144	unsigned int txbitlen)
145	{
146	unsigned int val;
147	unsigned long flags;
148
149	spin_lock_irqsave(&hw->lock, flags);
150
151	val = __raw_readl(hw->regs + USI_CNT);
152
153	val \|= (txbitlen << 0x03);
154
155	__raw_writel(val, hw->regs + USI_CNT);
156
157	spin_unlock_irqrestore(&hw->lock, flags);
158	}
159
160	static void nuc900_spi_gobusy(struct nuc900_spi *hw)
161	{
162	unsigned int val;
163	unsigned long flags;
164
165	spin_lock_irqsave(&hw->lock, flags);
166
167	val = __raw_readl(hw->regs + USI_CNT);
168
169	val \|= GOBUSY;
170
171	__raw_writel(val, hw->regs + USI_CNT);
172
173	spin_unlock_irqrestore(&hw->lock, flags);
174	}
175
176	static int nuc900_spi_setupxfer(struct spi_device *spi,
177	struct spi_transfer *t)
178	{
179	return 0;
180	}
181
182	static int nuc900_spi_setup(struct spi_device *spi)
183	{
184	return 0;
185	}
186
187	static inline unsigned int hw_txbyte(struct nuc900_spi *hw, int count)
188	{
189	return hw->tx ? hw->tx[count] : 0;
190	}
191
192	static int nuc900_spi_txrx(struct spi_device spi, struct spi_transfer t)
193	{
194	struct nuc900_spi *hw = to_hw(spi);
195
196	hw->tx = t->tx_buf;
197	hw->rx = t->rx_buf;
198	hw->len = t->len;
199	hw->count = 0;
200
201	__raw_writel(hw_txbyte(hw, 0x0), hw->regs + USI_TX0);
202
203	nuc900_spi_gobusy(hw);
204
205	wait_for_completion(&hw->done);
206
207	return hw->count;
208	}
209
210	static irqreturn_t nuc900_spi_irq(int irq, void *dev)
211	{
212	struct nuc900_spi *hw = dev;
213	unsigned int status;
214	unsigned int count = hw->count;
215
216	status = __raw_readl(hw->regs + USI_CNT);
217	__raw_writel(status, hw->regs + USI_CNT);
218
219	if (status & ENFLG) {
220	hw->count++;
221
222	if (hw->rx)
223	hw->rx[count] = __raw_readl(hw->regs + USI_RX0);
224	count++;
225
226	if (count < hw->len) {
227	__raw_writel(hw_txbyte(hw, count), hw->regs + USI_TX0);
228	nuc900_spi_gobusy(hw);
229	} else {
230	complete(&hw->done);
231	}
232
233	return IRQ_HANDLED;
234	}
235
236	complete(&hw->done);
237	return IRQ_HANDLED;
238	}
239
240	static void nuc900_tx_edge(struct nuc900_spi *hw, unsigned int edge)
241	{
242	unsigned int val;
243	unsigned long flags;
244
245	spin_lock_irqsave(&hw->lock, flags);
246
247	val = __raw_readl(hw->regs + USI_CNT);
248
249	if (edge)
250	val \|= TXNEG;
251	else
252	val &= ~TXNEG;
253	__raw_writel(val, hw->regs + USI_CNT);
254
255	spin_unlock_irqrestore(&hw->lock, flags);
256	}
257
258	static void nuc900_rx_edge(struct nuc900_spi *hw, unsigned int edge)
259	{
260	unsigned int val;
261	unsigned long flags;
262
263	spin_lock_irqsave(&hw->lock, flags);
264
265	val = __raw_readl(hw->regs + USI_CNT);
266
267	if (edge)
268	val \|= RXNEG;
269	else
270	val &= ~RXNEG;
271	__raw_writel(val, hw->regs + USI_CNT);
272
273	spin_unlock_irqrestore(&hw->lock, flags);
274	}
275
276	static void nuc900_send_first(struct nuc900_spi *hw, unsigned int lsb)
277	{
278	unsigned int val;
279	unsigned long flags;
280
281	spin_lock_irqsave(&hw->lock, flags);
282
283	val = __raw_readl(hw->regs + USI_CNT);
284
285	if (lsb)
286	val \|= LSB;
287	else
288	val &= ~LSB;
289	__raw_writel(val, hw->regs + USI_CNT);
290
291	spin_unlock_irqrestore(&hw->lock, flags);
292	}
293
294	static void nuc900_set_sleep(struct nuc900_spi *hw, unsigned int sleep)
295	{
296	unsigned int val;
297	unsigned long flags;
298
299	spin_lock_irqsave(&hw->lock, flags);
300
301	val = __raw_readl(hw->regs + USI_CNT);
302
303	if (sleep)
304	val \|= (sleep << 12);
305	else
306	val &= ~(0x0f << 12);
307	__raw_writel(val, hw->regs + USI_CNT);
308
309	spin_unlock_irqrestore(&hw->lock, flags);
310	}
311
312	static void nuc900_enable_int(struct nuc900_spi *hw)
313	{
314	unsigned int val;
315	unsigned long flags;
316
317	spin_lock_irqsave(&hw->lock, flags);
318
319	val = __raw_readl(hw->regs + USI_CNT);
320
321	val \|= ENINT;
322
323	__raw_writel(val, hw->regs + USI_CNT);
324
325	spin_unlock_irqrestore(&hw->lock, flags);
326	}
327
328	static void nuc900_set_divider(struct nuc900_spi *hw)
329	{
330	__raw_writel(hw->pdata->divider, hw->regs + USI_DIV);
331	}
332
333	static void nuc900_init_spi(struct nuc900_spi *hw)
334	{
335	clk_enable(hw->clk);
336	spin_lock_init(&hw->lock);
337
338	nuc900_tx_edge(hw, hw->pdata->txneg);
339	nuc900_rx_edge(hw, hw->pdata->rxneg);
340	nuc900_send_first(hw, hw->pdata->lsb);
341	nuc900_set_sleep(hw, hw->pdata->sleep);
342	nuc900_spi_setup_txbitlen(hw, hw->pdata->txbitlen);
343	nuc900_spi_setup_txnum(hw, hw->pdata->txnum);
344	nuc900_set_divider(hw);
345	nuc900_enable_int(hw);
346	}
347
348	static int __devinit nuc900_spi_probe(struct platform_device *pdev)
349	{
350	struct nuc900_spi *hw;
351	struct spi_master *master;
352	int err = 0;
353
354	master = spi_alloc_master(&pdev->dev, sizeof(struct nuc900_spi));
355	if (master == NULL) {
356	dev_err(&pdev->dev, "No memory for spi_master\n");
357	err = -ENOMEM;
358	goto err_nomem;
359	}
360
361	hw = spi_master_get_devdata(master);
362	memset(hw, 0, sizeof(struct nuc900_spi));
363
364	hw->master = spi_master_get(master);
365	hw->pdata = pdev->dev.platform_data;
366	hw->dev = &pdev->dev;
367
368	if (hw->pdata == NULL) {
369	dev_err(&pdev->dev, "No platform data supplied\n");
370	err = -ENOENT;
371	goto err_pdata;
372	}
373
374	platform_set_drvdata(pdev, hw);
375	init_completion(&hw->done);
376
377	master->mode_bits = SPI_MODE_0;
378	master->num_chipselect = hw->pdata->num_cs;
379	master->bus_num = hw->pdata->bus_num;
380	hw->bitbang.master = hw->master;
381	hw->bitbang.setup_transfer = nuc900_spi_setupxfer;
382	hw->bitbang.chipselect = nuc900_spi_chipsel;
383	hw->bitbang.txrx_bufs = nuc900_spi_txrx;
384	hw->bitbang.master->setup = nuc900_spi_setup;
385
386	hw->res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
387	if (hw->res == NULL) {
388	dev_err(&pdev->dev, "Cannot get IORESOURCE_MEM\n");
389	err = -ENOENT;
390	goto err_pdata;
391	}
392
393	hw->ioarea = request_mem_region(hw->res->start,
394	resource_size(hw->res), pdev->name);
395
396	if (hw->ioarea == NULL) {
397	dev_err(&pdev->dev, "Cannot reserve region\n");
398	err = -ENXIO;
399	goto err_pdata;
400	}
401
402	hw->regs = ioremap(hw->res->start, resource_size(hw->res));
403	if (hw->regs == NULL) {
404	dev_err(&pdev->dev, "Cannot map IO\n");
405	err = -ENXIO;
406	goto err_iomap;
407	}
408
409	hw->irq = platform_get_irq(pdev, 0);
410	if (hw->irq < 0) {
411	dev_err(&pdev->dev, "No IRQ specified\n");
412	err = -ENOENT;
413	goto err_irq;
414	}
415
416	err = request_irq(hw->irq, nuc900_spi_irq, 0, pdev->name, hw);
417	if (err) {
418	dev_err(&pdev->dev, "Cannot claim IRQ\n");
419	goto err_irq;
420	}
421
422	hw->clk = clk_get(&pdev->dev, "spi");
423	if (IS_ERR(hw->clk)) {
424	dev_err(&pdev->dev, "No clock for device\n");
425	err = PTR_ERR(hw->clk);
426	goto err_clk;
427	}
428
429	mfp_set_groupg(&pdev->dev);
430	nuc900_init_spi(hw);
431
432	err = spi_bitbang_start(&hw->bitbang);
433	if (err) {
434	dev_err(&pdev->dev, "Failed to register SPI master\n");
435	goto err_register;
436	}
437
438	return 0;
439
440	err_register:
441	clk_disable(hw->clk);
442	clk_put(hw->clk);
443	err_clk:
444	free_irq(hw->irq, hw);
445	err_irq:
446	iounmap(hw->regs);
447	err_iomap:
448	release_mem_region(hw->res->start, resource_size(hw->res));
449	kfree(hw->ioarea);
450	err_pdata:
bc3f67a3	451	spi_master_put(hw->master);
30eaed05 WZ	452
	453	err_nomem:
	454	return err;
	455	}
	456
	457	static int __devexit nuc900_spi_remove(struct platform_device *dev)
	458	{
	459	struct nuc900_spi *hw = platform_get_drvdata(dev);
	460
	461	free_irq(hw->irq, hw);
	462
	463	platform_set_drvdata(dev, NULL);
	464
708a7e43	465	spi_bitbang_stop(&hw->bitbang);
30eaed05 WZ	466
	467	clk_disable(hw->clk);
	468	clk_put(hw->clk);
	469
	470	iounmap(hw->regs);
	471
	472	release_mem_region(hw->res->start, resource_size(hw->res));
	473	kfree(hw->ioarea);
	474
	475	spi_master_put(hw->master);
	476	return 0;
	477	}
	478
	479	static struct platform_driver nuc900_spi_driver = {
	480	.probe = nuc900_spi_probe,
	481	.remove = __devexit_p(nuc900_spi_remove),
	482	.driver = {
	483	.name = "nuc900-spi",
	484	.owner = THIS_MODULE,
	485	},
	486	};
	487
	488	static int __init nuc900_spi_init(void)
	489	{
	490	return platform_driver_register(&nuc900_spi_driver);
	491	}
	492
	493	static void __exit nuc900_spi_exit(void)
	494	{
	495	platform_driver_unregister(&nuc900_spi_driver);
	496	}
	497
	498	module_init(nuc900_spi_init);
	499	module_exit(nuc900_spi_exit);
	500
	501	MODULE_AUTHOR("Wan ZongShun <[email protected]>");
	502	MODULE_DESCRIPTION("nuc900 spi driver!");
	503	MODULE_LICENSE("GPL");
	504	MODULE_ALIAS("platform:nuc900-spi");