[linux.git] / drivers / pwm / pwm-berlin.c

/*
 * Marvell Berlin PWM driver
 *
 * Copyright (C) 2015 Marvell Technology Group Ltd.
 *
 * Author: Antoine Tenart <[email protected]>
 *
 * This file is licensed under the terms of the GNU General Public
 * License version 2. This program is licensed "as is" without any
 * warranty of any kind, whether express or implied.
 */

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

#define BERLIN_PWM_EN			0x0
#define  BERLIN_PWM_ENABLE		BIT(0)
#define BERLIN_PWM_CONTROL		0x4
/*
 * The prescaler claims to support 8 different moduli, configured using the
 * low three bits of PWM_CONTROL. (Sequentially, they are 1, 4, 8, 16, 64,
 * 256, 1024, and 4096.)  However, the moduli from 4 to 1024 appear to be
 * implemented by internally shifting TCNT left without adding additional
 * bits. So, the max TCNT that actually works for a modulus of 4 is 0x3fff;
 * for 8, 0x1fff; and so on. This means that those moduli are entirely
 * useless, as we could just do the shift ourselves. The 4096 modulus is
 * implemented with a real prescaler, so we do use that, but we treat it
 * as a flag instead of pretending the modulus is actually configurable.
 */
#define  BERLIN_PWM_PRESCALE_4096	0x7
#define  BERLIN_PWM_INVERT_POLARITY	BIT(3)
#define BERLIN_PWM_DUTY			0x8
#define BERLIN_PWM_TCNT			0xc
#define  BERLIN_PWM_MAX_TCNT		65535

struct berlin_pwm_channel {
	u32 enable;
	u32 ctrl;
	u32 duty;
	u32 tcnt;
};

struct berlin_pwm_chip {
	struct pwm_chip chip;
	struct clk *clk;
	void __iomem *base;
};

static inline struct berlin_pwm_chip *to_berlin_pwm_chip(struct pwm_chip *chip)
{
	return container_of(chip, struct berlin_pwm_chip, chip);
}

static inline u32 berlin_pwm_readl(struct berlin_pwm_chip *bpc,
				   unsigned int channel, unsigned long offset)
{
	return readl_relaxed(bpc->base + channel * 0x10 + offset);
}

static inline void berlin_pwm_writel(struct berlin_pwm_chip *bpc,
				     unsigned int channel, u32 value,
				     unsigned long offset)
{
	writel_relaxed(value, bpc->base + channel * 0x10 + offset);
}

static int berlin_pwm_request(struct pwm_chip *chip, struct pwm_device *pwm)
{
	struct berlin_pwm_channel *channel;

	channel = kzalloc(sizeof(*channel), GFP_KERNEL);
	if (!channel)
		return -ENOMEM;

	return pwm_set_chip_data(pwm, channel);
}

static void berlin_pwm_free(struct pwm_chip *chip, struct pwm_device *pwm)
{
	struct berlin_pwm_channel *channel = pwm_get_chip_data(pwm);

	kfree(channel);
}

static int berlin_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
			     u64 duty_ns, u64 period_ns)
{
	struct berlin_pwm_chip *bpc = to_berlin_pwm_chip(chip);
	bool prescale_4096 = false;
	u32 value, duty, period;
	u64 cycles;

	cycles = clk_get_rate(bpc->clk);
	cycles *= period_ns;
	do_div(cycles, NSEC_PER_SEC);

	if (cycles > BERLIN_PWM_MAX_TCNT) {
		prescale_4096 = true;
		cycles >>= 12; // Prescaled by 4096

		if (cycles > BERLIN_PWM_MAX_TCNT)
			return -ERANGE;
	}

	period = cycles;
	cycles *= duty_ns;
	do_div(cycles, period_ns);
	duty = cycles;

	value = berlin_pwm_readl(bpc, pwm->hwpwm, BERLIN_PWM_CONTROL);
	if (prescale_4096)
		value |= BERLIN_PWM_PRESCALE_4096;
	else
		value &= ~BERLIN_PWM_PRESCALE_4096;
	berlin_pwm_writel(bpc, pwm->hwpwm, value, BERLIN_PWM_CONTROL);

	berlin_pwm_writel(bpc, pwm->hwpwm, duty, BERLIN_PWM_DUTY);
	berlin_pwm_writel(bpc, pwm->hwpwm, period, BERLIN_PWM_TCNT);

	return 0;
}

static int berlin_pwm_set_polarity(struct pwm_chip *chip,
				   struct pwm_device *pwm,
				   enum pwm_polarity polarity)
{
	struct berlin_pwm_chip *bpc = to_berlin_pwm_chip(chip);
	u32 value;

	value = berlin_pwm_readl(bpc, pwm->hwpwm, BERLIN_PWM_CONTROL);

	if (polarity == PWM_POLARITY_NORMAL)
		value &= ~BERLIN_PWM_INVERT_POLARITY;
	else
		value |= BERLIN_PWM_INVERT_POLARITY;

	berlin_pwm_writel(bpc, pwm->hwpwm, value, BERLIN_PWM_CONTROL);

	return 0;
}

static int berlin_pwm_enable(struct pwm_chip *chip, struct pwm_device *pwm)
{
	struct berlin_pwm_chip *bpc = to_berlin_pwm_chip(chip);
	u32 value;

	value = berlin_pwm_readl(bpc, pwm->hwpwm, BERLIN_PWM_EN);
	value |= BERLIN_PWM_ENABLE;
	berlin_pwm_writel(bpc, pwm->hwpwm, value, BERLIN_PWM_EN);

	return 0;
}

static void berlin_pwm_disable(struct pwm_chip *chip,
			       struct pwm_device *pwm)
{
	struct berlin_pwm_chip *bpc = to_berlin_pwm_chip(chip);
	u32 value;

	value = berlin_pwm_readl(bpc, pwm->hwpwm, BERLIN_PWM_EN);
	value &= ~BERLIN_PWM_ENABLE;
	berlin_pwm_writel(bpc, pwm->hwpwm, value, BERLIN_PWM_EN);
}

static int berlin_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm,
			    const struct pwm_state *state)
{
	int err;
	bool enabled = pwm->state.enabled;

	if (state->polarity != pwm->state.polarity) {
		if (enabled) {
			berlin_pwm_disable(chip, pwm);
			enabled = false;
		}

		err = berlin_pwm_set_polarity(chip, pwm, state->polarity);
		if (err)
			return err;
	}

	if (!state->enabled) {
		if (enabled)
			berlin_pwm_disable(chip, pwm);
		return 0;
	}

	err = berlin_pwm_config(chip, pwm, state->duty_cycle, state->period);
	if (err)
		return err;

	if (!enabled)
		return berlin_pwm_enable(chip, pwm);

	return 0;
}

static const struct pwm_ops berlin_pwm_ops = {
	.request = berlin_pwm_request,
	.free = berlin_pwm_free,
	.apply = berlin_pwm_apply,
	.owner = THIS_MODULE,
};

static const struct of_device_id berlin_pwm_match[] = {
	{ .compatible = "marvell,berlin-pwm" },
	{ },
};
MODULE_DEVICE_TABLE(of, berlin_pwm_match);

static int berlin_pwm_probe(struct platform_device *pdev)
{
	struct berlin_pwm_chip *bpc;
	int ret;

	bpc = devm_kzalloc(&pdev->dev, sizeof(*bpc), GFP_KERNEL);
	if (!bpc)
		return -ENOMEM;

	bpc->base = devm_platform_ioremap_resource(pdev, 0);
	if (IS_ERR(bpc->base))
		return PTR_ERR(bpc->base);

	bpc->clk = devm_clk_get(&pdev->dev, NULL);
	if (IS_ERR(bpc->clk))
		return PTR_ERR(bpc->clk);

	ret = clk_prepare_enable(bpc->clk);
	if (ret)
		return ret;

	bpc->chip.dev = &pdev->dev;
	bpc->chip.ops = &berlin_pwm_ops;
	bpc->chip.npwm = 4;

	ret = pwmchip_add(&bpc->chip);
	if (ret < 0) {
		dev_err(&pdev->dev, "failed to add PWM chip: %d\n", ret);
		clk_disable_unprepare(bpc->clk);
		return ret;
	}

	platform_set_drvdata(pdev, bpc);

	return 0;
}

static int berlin_pwm_remove(struct platform_device *pdev)
{
	struct berlin_pwm_chip *bpc = platform_get_drvdata(pdev);

	pwmchip_remove(&bpc->chip);

	clk_disable_unprepare(bpc->clk);

	return 0;
}

#ifdef CONFIG_PM_SLEEP
static int berlin_pwm_suspend(struct device *dev)
{
	struct berlin_pwm_chip *bpc = dev_get_drvdata(dev);
	unsigned int i;

	for (i = 0; i < bpc->chip.npwm; i++) {
		struct berlin_pwm_channel *channel;

		channel = pwm_get_chip_data(&bpc->chip.pwms[i]);
		if (!channel)
			continue;

		channel->enable = berlin_pwm_readl(bpc, i, BERLIN_PWM_ENABLE);
		channel->ctrl = berlin_pwm_readl(bpc, i, BERLIN_PWM_CONTROL);
		channel->duty = berlin_pwm_readl(bpc, i, BERLIN_PWM_DUTY);
		channel->tcnt = berlin_pwm_readl(bpc, i, BERLIN_PWM_TCNT);
	}

	clk_disable_unprepare(bpc->clk);

	return 0;
}

static int berlin_pwm_resume(struct device *dev)
{
	struct berlin_pwm_chip *bpc = dev_get_drvdata(dev);
	unsigned int i;
	int ret;

	ret = clk_prepare_enable(bpc->clk);
	if (ret)
		return ret;

	for (i = 0; i < bpc->chip.npwm; i++) {
		struct berlin_pwm_channel *channel;

		channel = pwm_get_chip_data(&bpc->chip.pwms[i]);
		if (!channel)
			continue;

		berlin_pwm_writel(bpc, i, channel->ctrl, BERLIN_PWM_CONTROL);
		berlin_pwm_writel(bpc, i, channel->duty, BERLIN_PWM_DUTY);
		berlin_pwm_writel(bpc, i, channel->tcnt, BERLIN_PWM_TCNT);
		berlin_pwm_writel(bpc, i, channel->enable, BERLIN_PWM_ENABLE);
	}

	return 0;
}
#endif

static SIMPLE_DEV_PM_OPS(berlin_pwm_pm_ops, berlin_pwm_suspend,
			 berlin_pwm_resume);

static struct platform_driver berlin_pwm_driver = {
	.probe = berlin_pwm_probe,
	.remove = berlin_pwm_remove,
	.driver = {
		.name = "berlin-pwm",
		.of_match_table = berlin_pwm_match,
		.pm = &berlin_pwm_pm_ops,
	},
};
module_platform_driver(berlin_pwm_driver);

MODULE_AUTHOR("Antoine Tenart <[email protected]>");
MODULE_DESCRIPTION("Marvell Berlin PWM driver");
MODULE_LICENSE("GPL v2");
Commit	Line	Data
59d5c8b1 AT	1	/*
	2	* Marvell Berlin PWM driver
	3	*
	4	* Copyright (C) 2015 Marvell Technology Group Ltd.
	5	*
	6	* Author: Antoine Tenart <[email protected]>
	7	*
	8	* This file is licensed under the terms of the GNU General Public
	9	* License version 2. This program is licensed "as is" without any
	10	* warranty of any kind, whether express or implied.
	11	*/
	12
	13	#include <linux/clk.h>
	14	#include <linux/io.h>
	15	#include <linux/kernel.h>
	16	#include <linux/module.h>
	17	#include <linux/platform_device.h>
	18	#include <linux/pwm.h>
bbf0722c	19	#include <linux/slab.h>
59d5c8b1 AT	20
	21	#define BERLIN_PWM_EN 0x0
	22	#define BERLIN_PWM_ENABLE BIT(0)
	23	#define BERLIN_PWM_CONTROL 0x4
4de445cb TH	24	/*
	25	* The prescaler claims to support 8 different moduli, configured using the
	26	* low three bits of PWM_CONTROL. (Sequentially, they are 1, 4, 8, 16, 64,
	27	* 256, 1024, and 4096.) However, the moduli from 4 to 1024 appear to be
	28	* implemented by internally shifting TCNT left without adding additional
	29	* bits. So, the max TCNT that actually works for a modulus of 4 is 0x3fff;
	30	* for 8, 0x1fff; and so on. This means that those moduli are entirely
	31	* useless, as we could just do the shift ourselves. The 4096 modulus is
	32	* implemented with a real prescaler, so we do use that, but we treat it
	33	* as a flag instead of pretending the modulus is actually configurable.
	34	*/
	35	#define BERLIN_PWM_PRESCALE_4096 0x7
59d5c8b1 AT	36	#define BERLIN_PWM_INVERT_POLARITY BIT(3)
	37	#define BERLIN_PWM_DUTY 0x8
	38	#define BERLIN_PWM_TCNT 0xc
	39	#define BERLIN_PWM_MAX_TCNT 65535
	40
bbf0722c JZ	41	struct berlin_pwm_channel {
	42	u32 enable;
	43	u32 ctrl;
	44	u32 duty;
	45	u32 tcnt;
	46	};
	47
59d5c8b1 AT	48	struct berlin_pwm_chip {
	49	struct pwm_chip chip;
	50	struct clk *clk;
	51	void __iomem *base;
	52	};
	53
	54	static inline struct berlin_pwm_chip to_berlin_pwm_chip(struct pwm_chip chip)
	55	{
	56	return container_of(chip, struct berlin_pwm_chip, chip);
	57	}
	58
3f3e8051	59	static inline u32 berlin_pwm_readl(struct berlin_pwm_chip *bpc,
59d5c8b1 AT	60	unsigned int channel, unsigned long offset)
59d5c8b1 AT	61	{
3f3e8051	62	return readl_relaxed(bpc->base + channel * 0x10 + offset);
59d5c8b1 AT	63	}
59d5c8b1 AT	64
3f3e8051	65	static inline void berlin_pwm_writel(struct berlin_pwm_chip *bpc,
59d5c8b1 AT	66	unsigned int channel, u32 value,
	67	unsigned long offset)
	68	{
3f3e8051	69	writel_relaxed(value, bpc->base + channel * 0x10 + offset);
59d5c8b1 AT	70	}
59d5c8b1 AT	71
bbf0722c JZ	72	static int berlin_pwm_request(struct pwm_chip chip, struct pwm_device pwm)
	73	{
	74	struct berlin_pwm_channel *channel;
	75
	76	channel = kzalloc(sizeof(*channel), GFP_KERNEL);
	77	if (!channel)
	78	return -ENOMEM;
	79
	80	return pwm_set_chip_data(pwm, channel);
	81	}
	82
	83	static void berlin_pwm_free(struct pwm_chip chip, struct pwm_device pwm)
	84	{
	85	struct berlin_pwm_channel *channel = pwm_get_chip_data(pwm);
	86
bbf0722c JZ	87	kfree(channel);
	88	}
	89
3f3e8051	90	static int berlin_pwm_config(struct pwm_chip chip, struct pwm_device pwm,
30dffb42	91	u64 duty_ns, u64 period_ns)
59d5c8b1	92	{
3f3e8051	93	struct berlin_pwm_chip *bpc = to_berlin_pwm_chip(chip);
4de445cb	94	bool prescale_4096 = false;
59d5c8b1	95	u32 value, duty, period;
4de445cb	96	u64 cycles;
59d5c8b1	97
3f3e8051	98	cycles = clk_get_rate(bpc->clk);
59d5c8b1 AT	99	cycles *= period_ns;
	100	do_div(cycles, NSEC_PER_SEC);
	101
4de445cb TH	102	if (cycles > BERLIN_PWM_MAX_TCNT) {
	103	prescale_4096 = true;
	104	cycles >>= 12; // Prescaled by 4096
59d5c8b1	105
4de445cb TH	106	if (cycles > BERLIN_PWM_MAX_TCNT)
4de445cb TH	107	return -ERANGE;
59d5c8b1 AT	108	}
59d5c8b1 AT	109
4de445cb TH	110	period = cycles;
4de445cb TH	111	cycles *= duty_ns;
59d5c8b1 AT	112	do_div(cycles, period_ns);
	113	duty = cycles;
	114
3f3e8051	115	value = berlin_pwm_readl(bpc, pwm->hwpwm, BERLIN_PWM_CONTROL);
4de445cb TH	116	if (prescale_4096)
	117	value \|= BERLIN_PWM_PRESCALE_4096;
	118	else
	119	value &= ~BERLIN_PWM_PRESCALE_4096;
3f3e8051	120	berlin_pwm_writel(bpc, pwm->hwpwm, value, BERLIN_PWM_CONTROL);
59d5c8b1	121
3f3e8051 UKK	122	berlin_pwm_writel(bpc, pwm->hwpwm, duty, BERLIN_PWM_DUTY);
3f3e8051 UKK	123	berlin_pwm_writel(bpc, pwm->hwpwm, period, BERLIN_PWM_TCNT);
59d5c8b1 AT	124
	125	return 0;
	126	}
	127
	128	static int berlin_pwm_set_polarity(struct pwm_chip *chip,
3f3e8051	129	struct pwm_device *pwm,
59d5c8b1 AT	130	enum pwm_polarity polarity)
59d5c8b1 AT	131	{
3f3e8051	132	struct berlin_pwm_chip *bpc = to_berlin_pwm_chip(chip);
59d5c8b1 AT	133	u32 value;
59d5c8b1 AT	134
3f3e8051	135	value = berlin_pwm_readl(bpc, pwm->hwpwm, BERLIN_PWM_CONTROL);
59d5c8b1 AT	136
	137	if (polarity == PWM_POLARITY_NORMAL)
	138	value &= ~BERLIN_PWM_INVERT_POLARITY;
	139	else
	140	value \|= BERLIN_PWM_INVERT_POLARITY;
	141
3f3e8051	142	berlin_pwm_writel(bpc, pwm->hwpwm, value, BERLIN_PWM_CONTROL);
59d5c8b1 AT	143
	144	return 0;
	145	}
	146
3f3e8051	147	static int berlin_pwm_enable(struct pwm_chip chip, struct pwm_device pwm)
59d5c8b1	148	{
3f3e8051	149	struct berlin_pwm_chip *bpc = to_berlin_pwm_chip(chip);
59d5c8b1 AT	150	u32 value;
59d5c8b1 AT	151
3f3e8051	152	value = berlin_pwm_readl(bpc, pwm->hwpwm, BERLIN_PWM_EN);
59d5c8b1	153	value \|= BERLIN_PWM_ENABLE;
3f3e8051	154	berlin_pwm_writel(bpc, pwm->hwpwm, value, BERLIN_PWM_EN);
59d5c8b1 AT	155
	156	return 0;
	157	}
	158
	159	static void berlin_pwm_disable(struct pwm_chip *chip,
3f3e8051	160	struct pwm_device *pwm)
59d5c8b1	161	{
3f3e8051	162	struct berlin_pwm_chip *bpc = to_berlin_pwm_chip(chip);
59d5c8b1 AT	163	u32 value;
59d5c8b1 AT	164
3f3e8051	165	value = berlin_pwm_readl(bpc, pwm->hwpwm, BERLIN_PWM_EN);
59d5c8b1	166	value &= ~BERLIN_PWM_ENABLE;
3f3e8051	167	berlin_pwm_writel(bpc, pwm->hwpwm, value, BERLIN_PWM_EN);
59d5c8b1 AT	168	}
59d5c8b1 AT	169
30dffb42 UKK	170	static int berlin_pwm_apply(struct pwm_chip chip, struct pwm_device pwm,
	171	const struct pwm_state *state)
	172	{
	173	int err;
	174	bool enabled = pwm->state.enabled;
	175
	176	if (state->polarity != pwm->state.polarity) {
	177	if (enabled) {
	178	berlin_pwm_disable(chip, pwm);
	179	enabled = false;
	180	}
	181
	182	err = berlin_pwm_set_polarity(chip, pwm, state->polarity);
	183	if (err)
	184	return err;
	185	}
	186
	187	if (!state->enabled) {
	188	if (enabled)
	189	berlin_pwm_disable(chip, pwm);
	190	return 0;
	191	}
	192
7d6d4aaf UKK	193	err = berlin_pwm_config(chip, pwm, state->duty_cycle, state->period);
	194	if (err)
	195	return err;
30dffb42 UKK	196
	197	if (!enabled)
	198	return berlin_pwm_enable(chip, pwm);
	199
	200	return 0;
	201	}
	202
59d5c8b1	203	static const struct pwm_ops berlin_pwm_ops = {
bbf0722c JZ	204	.request = berlin_pwm_request,
bbf0722c JZ	205	.free = berlin_pwm_free,
30dffb42	206	.apply = berlin_pwm_apply,
59d5c8b1 AT	207	.owner = THIS_MODULE,
	208	};
	209
	210	static const struct of_device_id berlin_pwm_match[] = {
	211	{ .compatible = "marvell,berlin-pwm" },
	212	{ },
	213	};
	214	MODULE_DEVICE_TABLE(of, berlin_pwm_match);
	215
	216	static int berlin_pwm_probe(struct platform_device *pdev)
	217	{
3f3e8051	218	struct berlin_pwm_chip *bpc;
59d5c8b1 AT	219	int ret;
59d5c8b1 AT	220
3f3e8051 UKK	221	bpc = devm_kzalloc(&pdev->dev, sizeof(*bpc), GFP_KERNEL);
3f3e8051 UKK	222	if (!bpc)
59d5c8b1 AT	223	return -ENOMEM;
59d5c8b1 AT	224
3f3e8051 UKK	225	bpc->base = devm_platform_ioremap_resource(pdev, 0);
	226	if (IS_ERR(bpc->base))
	227	return PTR_ERR(bpc->base);
59d5c8b1	228
3f3e8051 UKK	229	bpc->clk = devm_clk_get(&pdev->dev, NULL);
	230	if (IS_ERR(bpc->clk))
	231	return PTR_ERR(bpc->clk);
59d5c8b1	232
3f3e8051	233	ret = clk_prepare_enable(bpc->clk);
59d5c8b1 AT	234	if (ret)
	235	return ret;
	236
3f3e8051 UKK	237	bpc->chip.dev = &pdev->dev;
	238	bpc->chip.ops = &berlin_pwm_ops;
	239	bpc->chip.npwm = 4;
59d5c8b1	240
3f3e8051	241	ret = pwmchip_add(&bpc->chip);
59d5c8b1 AT	242	if (ret < 0) {
59d5c8b1 AT	243	dev_err(&pdev->dev, "failed to add PWM chip: %d\n", ret);
3f3e8051	244	clk_disable_unprepare(bpc->clk);
59d5c8b1 AT	245	return ret;
	246	}
	247
3f3e8051	248	platform_set_drvdata(pdev, bpc);
59d5c8b1 AT	249
	250	return 0;
	251	}
	252
	253	static int berlin_pwm_remove(struct platform_device *pdev)
	254	{
3f3e8051	255	struct berlin_pwm_chip *bpc = platform_get_drvdata(pdev);
59d5c8b1	256
0512f050 UKK	257	pwmchip_remove(&bpc->chip);
0512f050 UKK	258
3f3e8051	259	clk_disable_unprepare(bpc->clk);
59d5c8b1	260
0512f050	261	return 0;
59d5c8b1 AT	262	}
59d5c8b1 AT	263
bbf0722c JZ	264	#ifdef CONFIG_PM_SLEEP
	265	static int berlin_pwm_suspend(struct device *dev)
	266	{
3f3e8051	267	struct berlin_pwm_chip *bpc = dev_get_drvdata(dev);
bbf0722c JZ	268	unsigned int i;
bbf0722c JZ	269
3f3e8051	270	for (i = 0; i < bpc->chip.npwm; i++) {
bbf0722c JZ	271	struct berlin_pwm_channel *channel;
bbf0722c JZ	272
3f3e8051	273	channel = pwm_get_chip_data(&bpc->chip.pwms[i]);
bbf0722c JZ	274	if (!channel)
	275	continue;
	276
3f3e8051 UKK	277	channel->enable = berlin_pwm_readl(bpc, i, BERLIN_PWM_ENABLE);
	278	channel->ctrl = berlin_pwm_readl(bpc, i, BERLIN_PWM_CONTROL);
	279	channel->duty = berlin_pwm_readl(bpc, i, BERLIN_PWM_DUTY);
	280	channel->tcnt = berlin_pwm_readl(bpc, i, BERLIN_PWM_TCNT);
bbf0722c JZ	281	}
bbf0722c JZ	282
3f3e8051	283	clk_disable_unprepare(bpc->clk);
bbf0722c JZ	284
	285	return 0;
	286	}
	287
	288	static int berlin_pwm_resume(struct device *dev)
	289	{
3f3e8051	290	struct berlin_pwm_chip *bpc = dev_get_drvdata(dev);
bbf0722c JZ	291	unsigned int i;
	292	int ret;
	293
3f3e8051	294	ret = clk_prepare_enable(bpc->clk);
bbf0722c JZ	295	if (ret)
	296	return ret;
	297
3f3e8051	298	for (i = 0; i < bpc->chip.npwm; i++) {
bbf0722c JZ	299	struct berlin_pwm_channel *channel;
bbf0722c JZ	300
3f3e8051	301	channel = pwm_get_chip_data(&bpc->chip.pwms[i]);
bbf0722c JZ	302	if (!channel)
	303	continue;
	304
3f3e8051 UKK	305	berlin_pwm_writel(bpc, i, channel->ctrl, BERLIN_PWM_CONTROL);
	306	berlin_pwm_writel(bpc, i, channel->duty, BERLIN_PWM_DUTY);
	307	berlin_pwm_writel(bpc, i, channel->tcnt, BERLIN_PWM_TCNT);
	308	berlin_pwm_writel(bpc, i, channel->enable, BERLIN_PWM_ENABLE);
bbf0722c JZ	309	}
	310
	311	return 0;
	312	}
	313	#endif
	314
	315	static SIMPLE_DEV_PM_OPS(berlin_pwm_pm_ops, berlin_pwm_suspend,
	316	berlin_pwm_resume);
	317
59d5c8b1 AT	318	static struct platform_driver berlin_pwm_driver = {
	319	.probe = berlin_pwm_probe,
	320	.remove = berlin_pwm_remove,
	321	.driver = {
	322	.name = "berlin-pwm",
	323	.of_match_table = berlin_pwm_match,
bbf0722c	324	.pm = &berlin_pwm_pm_ops,
59d5c8b1 AT	325	},
	326	};
	327	module_platform_driver(berlin_pwm_driver);
	328
	329	MODULE_AUTHOR("Antoine Tenart <[email protected]>");
	330	MODULE_DESCRIPTION("Marvell Berlin PWM driver");
	331	MODULE_LICENSE("GPL v2");