[GitHub/mt8127/android_kernel_alcatel_ttab.git] / arch / arm / plat-s3c24xx / pwm.c

/* arch/arm/plat-s3c24xx/pwm.c
 *
 * Copyright (c) 2007 Ben Dooks
 * Copyright (c) 2008 Simtec Electronics
 *	Ben Dooks <ben@simtec.co.uk>, <ben-linux@fluff.org>
 *
 * S3C24XX PWM device core
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License.
*/

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/platform_device.h>
#include <linux/err.h>
#include <linux/clk.h>
#include <linux/io.h>
#include <linux/pwm.h>

#include <mach/irqs.h>

#include <plat/devs.h>
#include <plat/regs-timer.h>

struct pwm_device {
	struct list_head	 list;
	struct platform_device	*pdev;

	struct clk		*clk_div;
	struct clk		*clk;
	const char		*label;

	unsigned int		 period_ns;
	unsigned int		 duty_ns;

	unsigned char		 tcon_base;
	unsigned char		 running;
	unsigned char		 use_count;
	unsigned char		 pwm_id;
};

#define pwm_dbg(_pwm, msg...) dev_dbg(&(_pwm)->pdev->dev, msg)

static struct clk *clk_scaler[2];

/* Standard setup for a timer block. */

#define TIMER_RESOURCE_SIZE (1)

#define TIMER_RESOURCE(_tmr, _irq)			\
	(struct resource [TIMER_RESOURCE_SIZE]) {	\
		[0] = {					\
			.start	= _irq,			\
			.end	= _irq,			\
			.flags	= IORESOURCE_IRQ	\
		}					\
	}

#define DEFINE_S3C_TIMER(_tmr_no, _irq)			\
	.name		= "s3c24xx-pwm",		\
	.id		= _tmr_no,			\
	.num_resources	= TIMER_RESOURCE_SIZE,		\
	.resource	= TIMER_RESOURCE(_tmr_no, _irq),	\

/* since we already have an static mapping for the timer, we do not
 * bother setting any IO resource for the base.
 */

struct platform_device s3c_device_timer[] = {
	[0] = { DEFINE_S3C_TIMER(0, IRQ_TIMER0) },
	[1] = { DEFINE_S3C_TIMER(1, IRQ_TIMER1) },
	[2] = { DEFINE_S3C_TIMER(2, IRQ_TIMER2) },
	[3] = { DEFINE_S3C_TIMER(3, IRQ_TIMER3) },
	[4] = { DEFINE_S3C_TIMER(4, IRQ_TIMER4) },
};

static inline int pwm_is_tdiv(struct pwm_device *pwm)
{
	return clk_get_parent(pwm->clk) == pwm->clk_div;
}

static DEFINE_MUTEX(pwm_lock);
static LIST_HEAD(pwm_list);

struct pwm_device *pwm_request(int pwm_id, const char *label)
{
	struct pwm_device *pwm;
	int found = 0;

	mutex_lock(&pwm_lock);

	list_for_each_entry(pwm, &pwm_list, list) {
		if (pwm->pwm_id == pwm_id) {
			found = 1;
			break;
		}
	}

	if (found) {
		if (pwm->use_count == 0) {
			pwm->use_count = 1;
			pwm->label = label;
		} else
			pwm = ERR_PTR(-EBUSY);
	} else
		pwm = ERR_PTR(-ENOENT);

	mutex_unlock(&pwm_lock);
	return pwm;
}

EXPORT_SYMBOL(pwm_request);


void pwm_free(struct pwm_device *pwm)
{
	mutex_lock(&pwm_lock);

	if (pwm->use_count) {
		pwm->use_count--;
		pwm->label = NULL;
	} else
		printk(KERN_ERR "PWM%d device already freed\n", pwm->pwm_id);

	mutex_unlock(&pwm_lock);
}

EXPORT_SYMBOL(pwm_free);

#define pwm_tcon_start(pwm) (1 << (pwm->tcon_base + 0))
#define pwm_tcon_invert(pwm) (1 << (pwm->tcon_base + 2))
#define pwm_tcon_autoreload(pwm) (1 << (pwm->tcon_base + 3))
#define pwm_tcon_manulupdate(pwm) (1 << (pwm->tcon_base + 1))

int pwm_enable(struct pwm_device *pwm)
{
	unsigned long flags;
	unsigned long tcon;

	local_irq_save(flags);

	tcon = __raw_readl(S3C2410_TCON);
	tcon |= pwm_tcon_start(pwm);
	__raw_writel(tcon, S3C2410_TCON);

	local_irq_restore(flags);

	pwm->running = 1;
	return 0;
}

EXPORT_SYMBOL(pwm_enable);

void pwm_disable(struct pwm_device *pwm)
{
	unsigned long flags;
	unsigned long tcon;

	local_irq_save(flags);

	tcon = __raw_readl(S3C2410_TCON);
	tcon &= ~pwm_tcon_start(pwm);
	__raw_writel(tcon, S3C2410_TCON);

	local_irq_restore(flags);

	pwm->running = 0;
}

EXPORT_SYMBOL(pwm_disable);

static unsigned long pwm_calc_tin(struct pwm_device *pwm, unsigned long freq)
{
	unsigned long tin_parent_rate;
	unsigned int div;

	tin_parent_rate = clk_get_rate(clk_get_parent(pwm->clk_div));
	pwm_dbg(pwm, "tin parent at %lu\n", tin_parent_rate);

	for (div = 2; div <= 16; div *= 2) {
		if ((tin_parent_rate / (div << 16)) < freq)
			return tin_parent_rate / div;
	}

	return tin_parent_rate / 16;
}

#define NS_IN_HZ (1000000000UL)

int pwm_config(struct pwm_device *pwm, int duty_ns, int period_ns)
{
	unsigned long tin_rate;
	unsigned long tin_ns;
	unsigned long period;
	unsigned long flags;
	unsigned long tcon;
	unsigned long tcnt;
	long tcmp;

	/* We currently avoid using 64bit arithmetic by using the
	 * fact that anything faster than 1Hz is easily representable
	 * by 32bits. */

	if (period_ns > NS_IN_HZ || duty_ns > NS_IN_HZ)
		return -ERANGE;

	if (duty_ns > period_ns)
		return -EINVAL;

	if (period_ns == pwm->period_ns &&
	    duty_ns == pwm->duty_ns)
		return 0;

	/* The TCMP and TCNT can be read without a lock, they're not
	 * shared between the timers. */

	tcmp = __raw_readl(S3C2410_TCMPB(pwm->pwm_id));
	tcnt = __raw_readl(S3C2410_TCNTB(pwm->pwm_id));

	period = NS_IN_HZ / period_ns;

	pwm_dbg(pwm, "duty_ns=%d, period_ns=%d (%lu)\n",
		duty_ns, period_ns, period);

	/* Check to see if we are changing the clock rate of the PWM */

	if (pwm->period_ns != period_ns) {
		if (pwm_is_tdiv(pwm)) {
			tin_rate = pwm_calc_tin(pwm, period);
			clk_set_rate(pwm->clk_div, tin_rate);
		} else
			tin_rate = clk_get_rate(pwm->clk);

		pwm->period_ns = period_ns;

		pwm_dbg(pwm, "tin_rate=%lu\n", tin_rate);

		tin_ns = NS_IN_HZ / tin_rate;
		tcnt = period_ns / tin_ns;
	} else
		tin_ns = NS_IN_HZ / clk_get_rate(pwm->clk);

	/* Note, counters count down */

	tcmp = duty_ns / tin_ns;
	tcmp = tcnt - tcmp;

	pwm_dbg(pwm, "tin_ns=%lu, tcmp=%ld/%lu\n", tin_ns, tcmp, tcnt);

	if (tcmp < 0)
		tcmp = 0;

	/* Update the PWM register block. */

	local_irq_save(flags);

	__raw_writel(tcmp, S3C2410_TCMPB(pwm->pwm_id));
	__raw_writel(tcnt, S3C2410_TCNTB(pwm->pwm_id));

	tcon = __raw_readl(S3C2410_TCON);
	tcon |= pwm_tcon_manulupdate(pwm);
	tcon |= pwm_tcon_autoreload(pwm);
	__raw_writel(tcon, S3C2410_TCON);

	tcon &= ~pwm_tcon_manulupdate(pwm);
	__raw_writel(tcon, S3C2410_TCON);

	local_irq_restore(flags);

	return 0;
}

EXPORT_SYMBOL(pwm_config);

static int pwm_register(struct pwm_device *pwm)
{
	pwm->duty_ns = -1;
	pwm->period_ns = -1;

	mutex_lock(&pwm_lock);
	list_add_tail(&pwm->list, &pwm_list);
	mutex_unlock(&pwm_lock);

	return 0;
}

static int s3c_pwm_probe(struct platform_device *pdev)
{
	struct device *dev = &pdev->dev;
	struct pwm_device *pwm;
	unsigned long flags;
	unsigned long tcon;
	unsigned int id = pdev->id;
	int ret;

	if (id == 4) {
		dev_err(dev, "TIMER4 is currently not supported\n");
		return -ENXIO;
	}

	pwm = kzalloc(sizeof(struct pwm_device), GFP_KERNEL);
	if (pwm == NULL) {
		dev_err(dev, "failed to allocate pwm_device\n");
		return -ENOMEM;
	}

	pwm->pdev = pdev;
	pwm->pwm_id = id;

	/* calculate base of control bits in TCON */
	pwm->tcon_base = id == 0 ? 0 : (id * 4) + 4;

	pwm->clk = clk_get(dev, "pwm-tin");
	if (IS_ERR(pwm->clk)) {
		dev_err(dev, "failed to get pwm tin clk\n");
		ret = PTR_ERR(pwm->clk);
		goto err_alloc;
	}

	pwm->clk_div = clk_get(dev, "pwm-tdiv");
	if (IS_ERR(pwm->clk_div)) {
		dev_err(dev, "failed to get pwm tdiv clk\n");
		ret = PTR_ERR(pwm->clk_div);
		goto err_clk_tin;
	}

	local_irq_save(flags);

	tcon = __raw_readl(S3C2410_TCON);
	tcon |= pwm_tcon_invert(pwm);
	__raw_writel(tcon, S3C2410_TCON);

	local_irq_restore(flags);


	ret = pwm_register(pwm);
	if (ret) {
		dev_err(dev, "failed to register pwm\n");
		goto err_clk_tdiv;
	}

	pwm_dbg(pwm, "config bits %02x\n",
		(__raw_readl(S3C2410_TCON) >> pwm->tcon_base) & 0x0f);

	dev_info(dev, "tin at %lu, tdiv at %lu, tin=%sclk, base %d\n",
		 clk_get_rate(pwm->clk),
		 clk_get_rate(pwm->clk_div),
		 pwm_is_tdiv(pwm) ? "div" : "ext", pwm->tcon_base);

	platform_set_drvdata(pdev, pwm);
	return 0;

 err_clk_tdiv:
	clk_put(pwm->clk_div);

 err_clk_tin:
	clk_put(pwm->clk);

 err_alloc:
	kfree(pwm);
	return ret;
}

static int s3c_pwm_remove(struct platform_device *pdev)
{
	struct pwm_device *pwm = platform_get_drvdata(pdev);

	clk_put(pwm->clk_div);
	clk_put(pwm->clk);
	kfree(pwm);

	return 0;
}

static struct platform_driver s3c_pwm_driver = {
	.driver		= {
		.name	= "s3c24xx-pwm",
		.owner	= THIS_MODULE,
	},
	.probe		= s3c_pwm_probe,
	.remove		= __devexit_p(s3c_pwm_remove),
};

static int __init pwm_init(void)
{
	int ret;

	clk_scaler[0] = clk_get(NULL, "pwm-scaler0");
	clk_scaler[1] = clk_get(NULL, "pwm-scaler1");

	if (IS_ERR(clk_scaler[0]) || IS_ERR(clk_scaler[1])) {
		printk(KERN_ERR "%s: failed to get scaler clocks\n", __func__);
		return -EINVAL;
	}

	ret = platform_driver_register(&s3c_pwm_driver);
	if (ret)
		printk(KERN_ERR "%s: failed to add pwm driver\n", __func__);

	return ret;
}

arch_initcall(pwm_init);
Commit	Line	Data
6fc601e3 BD	1	/* arch/arm/plat-s3c24xx/pwm.c
	2	*
	3	* Copyright (c) 2007 Ben Dooks
	4	* Copyright (c) 2008 Simtec Electronics
	5	* Ben Dooks <ben@simtec.co.uk>, <ben-linux@fluff.org>
	6	*
	7	* S3C24XX PWM device core
	8	*
	9	* This program is free software; you can redistribute it and/or modify
	10	* it under the terms of the GNU General Public License as published by
	11	* the Free Software Foundation; either version 2 of the License.
	12	*/
	13
	14	#include <linux/module.h>
	15	#include <linux/kernel.h>
	16	#include <linux/platform_device.h>
	17	#include <linux/err.h>
	18	#include <linux/clk.h>
	19	#include <linux/io.h>
	20	#include <linux/pwm.h>
	21
80b02c17 RK	22	#include <mach/irqs.h>
80b02c17 RK	23
a2b7ba9c BD	24	#include <plat/devs.h>
a2b7ba9c BD	25	#include <plat/regs-timer.h>
6fc601e3 BD	26
	27	struct pwm_device {
	28	struct list_head list;
	29	struct platform_device *pdev;
	30
	31	struct clk *clk_div;
	32	struct clk *clk;
	33	const char *label;
	34
	35	unsigned int period_ns;
	36	unsigned int duty_ns;
	37
	38	unsigned char tcon_base;
	39	unsigned char running;
	40	unsigned char use_count;
	41	unsigned char pwm_id;
	42	};
	43
66592eee	44	#define pwm_dbg(_pwm, msg...) dev_dbg(&(_pwm)->pdev->dev, msg)
6fc601e3 BD	45
	46	static struct clk *clk_scaler[2];
	47
	48	/* Standard setup for a timer block. */
	49
	50	#define TIMER_RESOURCE_SIZE (1)
	51
	52	#define TIMER_RESOURCE(_tmr, _irq) \
	53	(struct resource [TIMER_RESOURCE_SIZE]) { \
	54	[0] = { \
	55	.start = _irq, \
	56	.end = _irq, \
	57	.flags = IORESOURCE_IRQ \
	58	} \
	59	}
	60
55b404fd	61	#define DEFINE_S3C_TIMER(_tmr_no, _irq) \
6fc601e3 BD	62	.name = "s3c24xx-pwm", \
	63	.id = _tmr_no, \
	64	.num_resources = TIMER_RESOURCE_SIZE, \
	65	.resource = TIMER_RESOURCE(_tmr_no, _irq), \
	66
	67	/* since we already have an static mapping for the timer, we do not
	68	* bother setting any IO resource for the base.
	69	*/
	70
	71	struct platform_device s3c_device_timer[] = {
55b404fd NC	72	[0] = { DEFINE_S3C_TIMER(0, IRQ_TIMER0) },
	73	[1] = { DEFINE_S3C_TIMER(1, IRQ_TIMER1) },
	74	[2] = { DEFINE_S3C_TIMER(2, IRQ_TIMER2) },
	75	[3] = { DEFINE_S3C_TIMER(3, IRQ_TIMER3) },
	76	[4] = { DEFINE_S3C_TIMER(4, IRQ_TIMER4) },
6fc601e3 BD	77	};
	78
	79	static inline int pwm_is_tdiv(struct pwm_device *pwm)
	80	{
	81	return clk_get_parent(pwm->clk) == pwm->clk_div;
	82	}
	83
	84	static DEFINE_MUTEX(pwm_lock);
	85	static LIST_HEAD(pwm_list);
	86
	87	struct pwm_device pwm_request(int pwm_id, const char label)
	88	{
	89	struct pwm_device *pwm;
	90	int found = 0;
	91
	92	mutex_lock(&pwm_lock);
	93
	94	list_for_each_entry(pwm, &pwm_list, list) {
	95	if (pwm->pwm_id == pwm_id) {
	96	found = 1;
	97	break;
	98	}
	99	}
	100
	101	if (found) {
	102	if (pwm->use_count == 0) {
	103	pwm->use_count = 1;
	104	pwm->label = label;
	105	} else
	106	pwm = ERR_PTR(-EBUSY);
	107	} else
	108	pwm = ERR_PTR(-ENOENT);
	109
	110	mutex_unlock(&pwm_lock);
	111	return pwm;
	112	}
	113
	114	EXPORT_SYMBOL(pwm_request);
	115
	116
	117	void pwm_free(struct pwm_device *pwm)
	118	{
	119	mutex_lock(&pwm_lock);
	120
	121	if (pwm->use_count) {
	122	pwm->use_count--;
	123	pwm->label = NULL;
	124	} else
	125	printk(KERN_ERR "PWM%d device already freed\n", pwm->pwm_id);
	126
	127	mutex_unlock(&pwm_lock);
	128	}
	129
	130	EXPORT_SYMBOL(pwm_free);
	131
	132	#define pwm_tcon_start(pwm) (1 << (pwm->tcon_base + 0))
	133	#define pwm_tcon_invert(pwm) (1 << (pwm->tcon_base + 2))
	134	#define pwm_tcon_autoreload(pwm) (1 << (pwm->tcon_base + 3))
	135	#define pwm_tcon_manulupdate(pwm) (1 << (pwm->tcon_base + 1))
	136
	137	int pwm_enable(struct pwm_device *pwm)
	138	{
	139	unsigned long flags;
	140	unsigned long tcon;
141
142	local_irq_save(flags);
143
144	tcon = __raw_readl(S3C2410_TCON);
145	tcon \|= pwm_tcon_start(pwm);
146	__raw_writel(tcon, S3C2410_TCON);
147
148	local_irq_restore(flags);
149
150	pwm->running = 1;
151	return 0;
152	}
153
154	EXPORT_SYMBOL(pwm_enable);
155
156	void pwm_disable(struct pwm_device *pwm)
157	{
158	unsigned long flags;
159	unsigned long tcon;
160
161	local_irq_save(flags);
162
163	tcon = __raw_readl(S3C2410_TCON);
164	tcon &= ~pwm_tcon_start(pwm);
165	__raw_writel(tcon, S3C2410_TCON);
166
167	local_irq_restore(flags);
168
169	pwm->running = 0;
170	}
171
172	EXPORT_SYMBOL(pwm_disable);
173
10389592	174	static unsigned long pwm_calc_tin(struct pwm_device *pwm, unsigned long freq)
6fc601e3 BD	175	{
	176	unsigned long tin_parent_rate;
	177	unsigned int div;
	178
	179	tin_parent_rate = clk_get_rate(clk_get_parent(pwm->clk_div));
	180	pwm_dbg(pwm, "tin parent at %lu\n", tin_parent_rate);
	181
	182	for (div = 2; div <= 16; div *= 2) {
	183	if ((tin_parent_rate / (div << 16)) < freq)
	184	return tin_parent_rate / div;
	185	}
	186
	187	return tin_parent_rate / 16;
	188	}
	189
	190	#define NS_IN_HZ (1000000000UL)
	191
	192	int pwm_config(struct pwm_device *pwm, int duty_ns, int period_ns)
	193	{
	194	unsigned long tin_rate;
	195	unsigned long tin_ns;
	196	unsigned long period;
	197	unsigned long flags;
	198	unsigned long tcon;
	199	unsigned long tcnt;
	200	long tcmp;
	201
	202	/* We currently avoid using 64bit arithmetic by using the
	203	* fact that anything faster than 1Hz is easily representable
	204	* by 32bits. */
	205
	206	if (period_ns > NS_IN_HZ \|\| duty_ns > NS_IN_HZ)
	207	return -ERANGE;
	208
	209	if (duty_ns > period_ns)
	210	return -EINVAL;
	211
	212	if (period_ns == pwm->period_ns &&
	213	duty_ns == pwm->duty_ns)
	214	return 0;
	215
	216	/* The TCMP and TCNT can be read without a lock, they're not
	217	* shared between the timers. */
	218
	219	tcmp = __raw_readl(S3C2410_TCMPB(pwm->pwm_id));
	220	tcnt = __raw_readl(S3C2410_TCNTB(pwm->pwm_id));
	221
	222	period = NS_IN_HZ / period_ns;
	223
	224	pwm_dbg(pwm, "duty_ns=%d, period_ns=%d (%lu)\n",
	225	duty_ns, period_ns, period);
	226
	227	/* Check to see if we are changing the clock rate of the PWM */
	228
	229	if (pwm->period_ns != period_ns) {
	230	if (pwm_is_tdiv(pwm)) {
	231	tin_rate = pwm_calc_tin(pwm, period);
	232	clk_set_rate(pwm->clk_div, tin_rate);
	233	} else
	234	tin_rate = clk_get_rate(pwm->clk);
	235
	236	pwm->period_ns = period_ns;
	237
	238	pwm_dbg(pwm, "tin_rate=%lu\n", tin_rate);
239
240	tin_ns = NS_IN_HZ / tin_rate;
241	tcnt = period_ns / tin_ns;
242	} else
243	tin_ns = NS_IN_HZ / clk_get_rate(pwm->clk);
244
245	/* Note, counters count down */
246
247	tcmp = duty_ns / tin_ns;
248	tcmp = tcnt - tcmp;
249
250	pwm_dbg(pwm, "tin_ns=%lu, tcmp=%ld/%lu\n", tin_ns, tcmp, tcnt);
251
252	if (tcmp < 0)
253	tcmp = 0;
254
255	/* Update the PWM register block. */
256
257	local_irq_save(flags);
258
259	__raw_writel(tcmp, S3C2410_TCMPB(pwm->pwm_id));
260	__raw_writel(tcnt, S3C2410_TCNTB(pwm->pwm_id));
261
262	tcon = __raw_readl(S3C2410_TCON);
263	tcon \|= pwm_tcon_manulupdate(pwm);
264	tcon \|= pwm_tcon_autoreload(pwm);
265	__raw_writel(tcon, S3C2410_TCON);
266
267	tcon &= ~pwm_tcon_manulupdate(pwm);
268	__raw_writel(tcon, S3C2410_TCON);
269
270	local_irq_restore(flags);
271
272	return 0;
273	}
274
275	EXPORT_SYMBOL(pwm_config);
276
277	static int pwm_register(struct pwm_device *pwm)
278	{
279	pwm->duty_ns = -1;
280	pwm->period_ns = -1;
281
282	mutex_lock(&pwm_lock);
283	list_add_tail(&pwm->list, &pwm_list);
284	mutex_unlock(&pwm_lock);
285
286	return 0;
287	}
288
289	static int s3c_pwm_probe(struct platform_device *pdev)
290	{
291	struct device *dev = &pdev->dev;
292	struct pwm_device *pwm;
293	unsigned long flags;
294	unsigned long tcon;
295	unsigned int id = pdev->id;
296	int ret;
297
298	if (id == 4) {
299	dev_err(dev, "TIMER4 is currently not supported\n");
300	return -ENXIO;
301	}
302
303	pwm = kzalloc(sizeof(struct pwm_device), GFP_KERNEL);
304	if (pwm == NULL) {
305	dev_err(dev, "failed to allocate pwm_device\n");
306	return -ENOMEM;
307	}
308
309	pwm->pdev = pdev;
310	pwm->pwm_id = id;
311
312	/* calculate base of control bits in TCON */
313	pwm->tcon_base = id == 0 ? 0 : (id * 4) + 4;
314
315	pwm->clk = clk_get(dev, "pwm-tin");
316	if (IS_ERR(pwm->clk)) {
317	dev_err(dev, "failed to get pwm tin clk\n");
318	ret = PTR_ERR(pwm->clk);
319	goto err_alloc;
320	}
321
322	pwm->clk_div = clk_get(dev, "pwm-tdiv");
323	if (IS_ERR(pwm->clk_div)) {
324	dev_err(dev, "failed to get pwm tdiv clk\n");
325	ret = PTR_ERR(pwm->clk_div);
326	goto err_clk_tin;
327	}
328
329	local_irq_save(flags);
330
331	tcon = __raw_readl(S3C2410_TCON);
332	tcon \|= pwm_tcon_invert(pwm);
333	__raw_writel(tcon, S3C2410_TCON);
334
335	local_irq_restore(flags);
336
337
338	ret = pwm_register(pwm);
339	if (ret) {
340	dev_err(dev, "failed to register pwm\n");
341	goto err_clk_tdiv;
342	}
343
344	pwm_dbg(pwm, "config bits %02x\n",
345	(__raw_readl(S3C2410_TCON) >> pwm->tcon_base) & 0x0f);
346
347	dev_info(dev, "tin at %lu, tdiv at %lu, tin=%sclk, base %d\n",
348	clk_get_rate(pwm->clk),
349	clk_get_rate(pwm->clk_div),
350	pwm_is_tdiv(pwm) ? "div" : "ext", pwm->tcon_base);
351
352	platform_set_drvdata(pdev, pwm);
353	return 0;
354
355	err_clk_tdiv:
356	clk_put(pwm->clk_div);
357
358	err_clk_tin:
359	clk_put(pwm->clk);
360
361	err_alloc:
362	kfree(pwm);
363	return ret;
364	}
365
366	static int s3c_pwm_remove(struct platform_device *pdev)
367	{
368	struct pwm_device *pwm = platform_get_drvdata(pdev);
369
370	clk_put(pwm->clk_div);
371	clk_put(pwm->clk);
372	kfree(pwm);
373
374	return 0;
375	}
376
377	static struct platform_driver s3c_pwm_driver = {
378	.driver = {
379	.name = "s3c24xx-pwm",
380	.owner = THIS_MODULE,
381	},
382	.probe = s3c_pwm_probe,
383	.remove = __devexit_p(s3c_pwm_remove),
384	};
385
386	static int __init pwm_init(void)
387	{
388	int ret;
389
390	clk_scaler[0] = clk_get(NULL, "pwm-scaler0");
391	clk_scaler[1] = clk_get(NULL, "pwm-scaler1");
392
393	if (IS_ERR(clk_scaler[0]) \|\| IS_ERR(clk_scaler[1])) {
394	printk(KERN_ERR "%s: failed to get scaler clocks\n", __func__);
395	return -EINVAL;
396	}
397
398	ret = platform_driver_register(&s3c_pwm_driver);
399	if (ret)
400	printk(KERN_ERR "%s: failed to add pwm driver\n", __func__);
401
402	return ret;
403	}
404
405	arch_initcall(pwm_init);