[deliverable/linux.git] / arch / arm / plat-samsung / pwm.c

/* arch/arm/plat-s3c/pwm.c
 *
 * Copyright (c) 2007 Ben Dooks
 * Copyright (c) 2008 Simtec Electronics
 *	Ben Dooks <ben@simtec.co.uk>, <ben-linux@fluff.org>
 *
 * S3C series 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 <mach/map.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;
	/* the pwm hw only checks the compare register after a decrement,
	   so the pin never toggles if tcmp = tcnt */
	if (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 __devexit 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;
}

#ifdef CONFIG_PM
static int s3c_pwm_suspend(struct platform_device *pdev, pm_message_t state)
{
	struct pwm_device *pwm = platform_get_drvdata(pdev);

	/* No one preserve these values during suspend so reset them
	 * Otherwise driver leaves PWM unconfigured if same values
	 * passed to pwm_config
	 */
	pwm->period_ns = 0;
	pwm->duty_ns = 0;

	return 0;
}

static int s3c_pwm_resume(struct platform_device *pdev)
{
	struct pwm_device *pwm = platform_get_drvdata(pdev);
	unsigned long tcon;

	/* Restore invertion */
	tcon = __raw_readl(S3C2410_TCON);
	tcon |= pwm_tcon_invert(pwm);
	__raw_writel(tcon, S3C2410_TCON);

	return 0;
}

#else
#define s3c_pwm_suspend NULL
#define s3c_pwm_resume NULL
#endif

static struct platform_driver s3c_pwm_driver = {
	.driver		= {
		.name	= "s3c24xx-pwm",
		.owner	= THIS_MODULE,
	},
	.probe		= s3c_pwm_probe,
	.remove		= __devexit_p(s3c_pwm_remove),
	.suspend	= s3c_pwm_suspend,
	.resume		= s3c_pwm_resume,
};

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
b5ead1cd	1	/* arch/arm/plat-s3c/pwm.c
6fc601e3 BD	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	*
b5ead1cd	7	* S3C series PWM device core
6fc601e3 BD	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	22	#include <mach/irqs.h>
b5ead1cd	23	#include <mach/map.h>
80b02c17	24
a2b7ba9c BD	25	#include <plat/devs.h>
a2b7ba9c BD	26	#include <plat/regs-timer.h>
6fc601e3 BD	27
	28	struct pwm_device {
	29	struct list_head list;
	30	struct platform_device *pdev;
	31
	32	struct clk *clk_div;
	33	struct clk *clk;
	34	const char *label;
	35
	36	unsigned int period_ns;
	37	unsigned int duty_ns;
	38
	39	unsigned char tcon_base;
	40	unsigned char running;
	41	unsigned char use_count;
	42	unsigned char pwm_id;
	43	};
	44
66592eee	45	#define pwm_dbg(_pwm, msg...) dev_dbg(&(_pwm)->pdev->dev, msg)
6fc601e3 BD	46
	47	static struct clk *clk_scaler[2];
	48
	49	/* Standard setup for a timer block. */
	50
	51	#define TIMER_RESOURCE_SIZE (1)
	52
	53	#define TIMER_RESOURCE(_tmr, _irq) \
	54	(struct resource [TIMER_RESOURCE_SIZE]) { \
	55	[0] = { \
	56	.start = _irq, \
	57	.end = _irq, \
	58	.flags = IORESOURCE_IRQ \
	59	} \
	60	}
	61
55b404fd	62	#define DEFINE_S3C_TIMER(_tmr_no, _irq) \
6fc601e3 BD	63	.name = "s3c24xx-pwm", \
	64	.id = _tmr_no, \
	65	.num_resources = TIMER_RESOURCE_SIZE, \
	66	.resource = TIMER_RESOURCE(_tmr_no, _irq), \
	67
	68	/* since we already have an static mapping for the timer, we do not
	69	* bother setting any IO resource for the base.
	70	*/
	71
	72	struct platform_device s3c_device_timer[] = {
55b404fd NC	73	[0] = { DEFINE_S3C_TIMER(0, IRQ_TIMER0) },
	74	[1] = { DEFINE_S3C_TIMER(1, IRQ_TIMER1) },
	75	[2] = { DEFINE_S3C_TIMER(2, IRQ_TIMER2) },
	76	[3] = { DEFINE_S3C_TIMER(3, IRQ_TIMER3) },
	77	[4] = { DEFINE_S3C_TIMER(4, IRQ_TIMER4) },
6fc601e3 BD	78	};
	79
	80	static inline int pwm_is_tdiv(struct pwm_device *pwm)
	81	{
	82	return clk_get_parent(pwm->clk) == pwm->clk_div;
	83	}
	84
	85	static DEFINE_MUTEX(pwm_lock);
	86	static LIST_HEAD(pwm_list);
	87
	88	struct pwm_device pwm_request(int pwm_id, const char label)
	89	{
	90	struct pwm_device *pwm;
	91	int found = 0;
	92
	93	mutex_lock(&pwm_lock);
	94
	95	list_for_each_entry(pwm, &pwm_list, list) {
	96	if (pwm->pwm_id == pwm_id) {
	97	found = 1;
	98	break;
	99	}
	100	}
	101
	102	if (found) {
	103	if (pwm->use_count == 0) {
	104	pwm->use_count = 1;
	105	pwm->label = label;
	106	} else
	107	pwm = ERR_PTR(-EBUSY);
	108	} else
	109	pwm = ERR_PTR(-ENOENT);
	110
	111	mutex_unlock(&pwm_lock);
	112	return pwm;
	113	}
	114
	115	EXPORT_SYMBOL(pwm_request);
	116
	117
	118	void pwm_free(struct pwm_device *pwm)
	119	{
	120	mutex_lock(&pwm_lock);
	121
	122	if (pwm->use_count) {
	123	pwm->use_count--;
	124	pwm->label = NULL;
	125	} else
	126	printk(KERN_ERR "PWM%d device already freed\n", pwm->pwm_id);
	127
	128	mutex_unlock(&pwm_lock);
	129	}
	130
	131	EXPORT_SYMBOL(pwm_free);
	132
	133	#define pwm_tcon_start(pwm) (1 << (pwm->tcon_base + 0))
	134	#define pwm_tcon_invert(pwm) (1 << (pwm->tcon_base + 2))
	135	#define pwm_tcon_autoreload(pwm) (1 << (pwm->tcon_base + 3))
	136	#define pwm_tcon_manulupdate(pwm) (1 << (pwm->tcon_base + 1))
	137
	138	int pwm_enable(struct pwm_device *pwm)
	139	{
	140	unsigned long flags;
	141	unsigned long tcon;
142
143	local_irq_save(flags);
144
145	tcon = __raw_readl(S3C2410_TCON);
146	tcon \|= pwm_tcon_start(pwm);
147	__raw_writel(tcon, S3C2410_TCON);
148
149	local_irq_restore(flags);
150
151	pwm->running = 1;
152	return 0;
153	}
154
155	EXPORT_SYMBOL(pwm_enable);
156
157	void pwm_disable(struct pwm_device *pwm)
158	{
159	unsigned long flags;
160	unsigned long tcon;
161
162	local_irq_save(flags);
163
164	tcon = __raw_readl(S3C2410_TCON);
165	tcon &= ~pwm_tcon_start(pwm);
166	__raw_writel(tcon, S3C2410_TCON);
167
168	local_irq_restore(flags);
169
170	pwm->running = 0;
171	}
172
173	EXPORT_SYMBOL(pwm_disable);
174
10389592	175	static unsigned long pwm_calc_tin(struct pwm_device *pwm, unsigned long freq)
6fc601e3 BD	176	{
	177	unsigned long tin_parent_rate;
	178	unsigned int div;
	179
	180	tin_parent_rate = clk_get_rate(clk_get_parent(pwm->clk_div));
	181	pwm_dbg(pwm, "tin parent at %lu\n", tin_parent_rate);
	182
	183	for (div = 2; div <= 16; div *= 2) {
	184	if ((tin_parent_rate / (div << 16)) < freq)
	185	return tin_parent_rate / div;
	186	}
	187
	188	return tin_parent_rate / 16;
	189	}
	190
	191	#define NS_IN_HZ (1000000000UL)
	192
	193	int pwm_config(struct pwm_device *pwm, int duty_ns, int period_ns)
	194	{
	195	unsigned long tin_rate;
	196	unsigned long tin_ns;
	197	unsigned long period;
	198	unsigned long flags;
	199	unsigned long tcon;
	200	unsigned long tcnt;
	201	long tcmp;
	202
	203	/* We currently avoid using 64bit arithmetic by using the
	204	* fact that anything faster than 1Hz is easily representable
	205	* by 32bits. */
	206
	207	if (period_ns > NS_IN_HZ \|\| duty_ns > NS_IN_HZ)
	208	return -ERANGE;
	209
	210	if (duty_ns > period_ns)
	211	return -EINVAL;
	212
	213	if (period_ns == pwm->period_ns &&
	214	duty_ns == pwm->duty_ns)
	215	return 0;
	216
	217	/* The TCMP and TCNT can be read without a lock, they're not
	218	* shared between the timers. */
	219
	220	tcmp = __raw_readl(S3C2410_TCMPB(pwm->pwm_id));
	221	tcnt = __raw_readl(S3C2410_TCNTB(pwm->pwm_id));
	222
	223	period = NS_IN_HZ / period_ns;
	224
	225	pwm_dbg(pwm, "duty_ns=%d, period_ns=%d (%lu)\n",
	226	duty_ns, period_ns, period);
	227
	228	/* Check to see if we are changing the clock rate of the PWM */
	229
	230	if (pwm->period_ns != period_ns) {
	231	if (pwm_is_tdiv(pwm)) {
	232	tin_rate = pwm_calc_tin(pwm, period);
	233	clk_set_rate(pwm->clk_div, tin_rate);
	234	} else
	235	tin_rate = clk_get_rate(pwm->clk);
	236
	237	pwm->period_ns = period_ns;
	238
	239	pwm_dbg(pwm, "tin_rate=%lu\n", tin_rate);
240
241	tin_ns = NS_IN_HZ / tin_rate;
242	tcnt = period_ns / tin_ns;
243	} else
244	tin_ns = NS_IN_HZ / clk_get_rate(pwm->clk);
245
246	/* Note, counters count down */
247
248	tcmp = duty_ns / tin_ns;
249	tcmp = tcnt - tcmp;
165f5f64 PK	250	/* the pwm hw only checks the compare register after a decrement,
	251	so the pin never toggles if tcmp = tcnt */
	252	if (tcmp == tcnt)
	253	tcmp--;
6fc601e3 BD	254
	255	pwm_dbg(pwm, "tin_ns=%lu, tcmp=%ld/%lu\n", tin_ns, tcmp, tcnt);
	256
	257	if (tcmp < 0)
	258	tcmp = 0;
	259
	260	/* Update the PWM register block. */
	261
	262	local_irq_save(flags);
	263
	264	__raw_writel(tcmp, S3C2410_TCMPB(pwm->pwm_id));
	265	__raw_writel(tcnt, S3C2410_TCNTB(pwm->pwm_id));
	266
	267	tcon = __raw_readl(S3C2410_TCON);
	268	tcon \|= pwm_tcon_manulupdate(pwm);
	269	tcon \|= pwm_tcon_autoreload(pwm);
	270	__raw_writel(tcon, S3C2410_TCON);
	271
	272	tcon &= ~pwm_tcon_manulupdate(pwm);
	273	__raw_writel(tcon, S3C2410_TCON);
	274
	275	local_irq_restore(flags);
	276
	277	return 0;
	278	}
	279
	280	EXPORT_SYMBOL(pwm_config);
	281
	282	static int pwm_register(struct pwm_device *pwm)
	283	{
	284	pwm->duty_ns = -1;
	285	pwm->period_ns = -1;
	286
	287	mutex_lock(&pwm_lock);
	288	list_add_tail(&pwm->list, &pwm_list);
	289	mutex_unlock(&pwm_lock);
	290
	291	return 0;
	292	}
	293
	294	static int s3c_pwm_probe(struct platform_device *pdev)
	295	{
	296	struct device *dev = &pdev->dev;
	297	struct pwm_device *pwm;
	298	unsigned long flags;
	299	unsigned long tcon;
	300	unsigned int id = pdev->id;
	301	int ret;
	302
	303	if (id == 4) {
	304	dev_err(dev, "TIMER4 is currently not supported\n");
	305	return -ENXIO;
	306	}
	307
	308	pwm = kzalloc(sizeof(struct pwm_device), GFP_KERNEL);
	309	if (pwm == NULL) {
	310	dev_err(dev, "failed to allocate pwm_device\n");
	311	return -ENOMEM;
	312	}
	313
	314	pwm->pdev = pdev;
	315	pwm->pwm_id = id;
	316
	317	/* calculate base of control bits in TCON */
318	pwm->tcon_base = id == 0 ? 0 : (id * 4) + 4;
319
320	pwm->clk = clk_get(dev, "pwm-tin");
321	if (IS_ERR(pwm->clk)) {
322	dev_err(dev, "failed to get pwm tin clk\n");
323	ret = PTR_ERR(pwm->clk);
324	goto err_alloc;
325	}
326
327	pwm->clk_div = clk_get(dev, "pwm-tdiv");
328	if (IS_ERR(pwm->clk_div)) {
329	dev_err(dev, "failed to get pwm tdiv clk\n");
330	ret = PTR_ERR(pwm->clk_div);
331	goto err_clk_tin;
332	}
333
334	local_irq_save(flags);
335
336	tcon = __raw_readl(S3C2410_TCON);
337	tcon \|= pwm_tcon_invert(pwm);
338	__raw_writel(tcon, S3C2410_TCON);
339
340	local_irq_restore(flags);
341
342
343	ret = pwm_register(pwm);
344	if (ret) {
345	dev_err(dev, "failed to register pwm\n");
346	goto err_clk_tdiv;
347	}
348
349	pwm_dbg(pwm, "config bits %02x\n",
350	(__raw_readl(S3C2410_TCON) >> pwm->tcon_base) & 0x0f);
351
352	dev_info(dev, "tin at %lu, tdiv at %lu, tin=%sclk, base %d\n",
353	clk_get_rate(pwm->clk),
354	clk_get_rate(pwm->clk_div),
355	pwm_is_tdiv(pwm) ? "div" : "ext", pwm->tcon_base);
356
357	platform_set_drvdata(pdev, pwm);
358	return 0;
359
360	err_clk_tdiv:
361	clk_put(pwm->clk_div);
362
363	err_clk_tin:
364	clk_put(pwm->clk);
365
366	err_alloc:
367	kfree(pwm);
368	return ret;
369	}
370
93b0d8c6	371	static int __devexit s3c_pwm_remove(struct platform_device *pdev)
6fc601e3 BD	372	{
	373	struct pwm_device *pwm = platform_get_drvdata(pdev);
	374
	375	clk_put(pwm->clk_div);
	376	clk_put(pwm->clk);
	377	kfree(pwm);
	378
	379	return 0;
	380	}
	381
e79032aa VK	382	#ifdef CONFIG_PM
	383	static int s3c_pwm_suspend(struct platform_device *pdev, pm_message_t state)
	384	{
	385	struct pwm_device *pwm = platform_get_drvdata(pdev);
	386
	387	/* No one preserve these values during suspend so reset them
	388	* Otherwise driver leaves PWM unconfigured if same values
	389	* passed to pwm_config
	390	*/
	391	pwm->period_ns = 0;
	392	pwm->duty_ns = 0;
	393
	394	return 0;
	395	}
	396
	397	static int s3c_pwm_resume(struct platform_device *pdev)
	398	{
	399	struct pwm_device *pwm = platform_get_drvdata(pdev);
	400	unsigned long tcon;
	401
	402	/* Restore invertion */
	403	tcon = __raw_readl(S3C2410_TCON);
	404	tcon \|= pwm_tcon_invert(pwm);
	405	__raw_writel(tcon, S3C2410_TCON);
	406
	407	return 0;
	408	}
	409
	410	#else
	411	#define s3c_pwm_suspend NULL
	412	#define s3c_pwm_resume NULL
	413	#endif
	414
6fc601e3 BD	415	static struct platform_driver s3c_pwm_driver = {
	416	.driver = {
	417	.name = "s3c24xx-pwm",
	418	.owner = THIS_MODULE,
	419	},
	420	.probe = s3c_pwm_probe,
	421	.remove = __devexit_p(s3c_pwm_remove),
e79032aa VK	422	.suspend = s3c_pwm_suspend,
e79032aa VK	423	.resume = s3c_pwm_resume,
6fc601e3 BD	424	};
	425
	426	static int __init pwm_init(void)
	427	{
	428	int ret;
	429
	430	clk_scaler[0] = clk_get(NULL, "pwm-scaler0");
	431	clk_scaler[1] = clk_get(NULL, "pwm-scaler1");
	432
	433	if (IS_ERR(clk_scaler[0]) \|\| IS_ERR(clk_scaler[1])) {
	434	printk(KERN_ERR "%s: failed to get scaler clocks\n", __func__);
	435	return -EINVAL;
	436	}
	437
	438	ret = platform_driver_register(&s3c_pwm_driver);
	439	if (ret)
	440	printk(KERN_ERR "%s: failed to add pwm driver\n", __func__);
	441
	442	return ret;
	443	}
	444
	445	arch_initcall(pwm_init);