[linux-block.git] / drivers / pwm / pwm-clps711x.c

// SPDX-License-Identifier: GPL-2.0+
/*
 * Cirrus Logic CLPS711X PWM driver
 * Author: Alexander Shiyan <shc_work@mail.ru>
 */

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

struct clps711x_chip {
	void __iomem *pmpcon;
	struct clk *clk;
	spinlock_t lock;
};

static inline struct clps711x_chip *to_clps711x_chip(struct pwm_chip *chip)
{
	return pwmchip_get_drvdata(chip);
}

static int clps711x_pwm_request(struct pwm_chip *chip, struct pwm_device *pwm)
{
	struct clps711x_chip *priv = to_clps711x_chip(chip);
	unsigned int freq = clk_get_rate(priv->clk);

	if (!freq)
		return -EINVAL;

	/* Store constant period value */
	pwm->args.period = DIV_ROUND_CLOSEST(NSEC_PER_SEC, freq);

	return 0;
}

static int clps711x_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm,
			      const struct pwm_state *state)
{
	struct clps711x_chip *priv = to_clps711x_chip(chip);
	/* PWM0 - bits 4..7, PWM1 - bits 8..11 */
	u32 shift = (pwm->hwpwm + 1) * 4;
	unsigned long flags;
	u32 pmpcon, val;

	if (state->polarity != PWM_POLARITY_NORMAL)
		return -EINVAL;

	if (state->period != pwm->args.period)
		return -EINVAL;

	if (state->enabled)
		val = mul_u64_u64_div_u64(state->duty_cycle, 0xf, state->period);
	else
		val = 0;

	spin_lock_irqsave(&priv->lock, flags);

	pmpcon = readl(priv->pmpcon);
	pmpcon &= ~(0xf << shift);
	pmpcon |= val << shift;
	writel(pmpcon, priv->pmpcon);

	spin_unlock_irqrestore(&priv->lock, flags);

	return 0;
}

static const struct pwm_ops clps711x_pwm_ops = {
	.request = clps711x_pwm_request,
	.apply = clps711x_pwm_apply,
};

static int clps711x_pwm_probe(struct platform_device *pdev)
{
	struct pwm_chip *chip;
	struct clps711x_chip *priv;

	chip = devm_pwmchip_alloc(&pdev->dev, 2, sizeof(*priv));
	if (IS_ERR(chip))
		return PTR_ERR(chip);
	priv = to_clps711x_chip(chip);

	priv->pmpcon = devm_platform_ioremap_resource(pdev, 0);
	if (IS_ERR(priv->pmpcon))
		return PTR_ERR(priv->pmpcon);

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

	chip->ops = &clps711x_pwm_ops;

	spin_lock_init(&priv->lock);

	return devm_pwmchip_add(&pdev->dev, chip);
}

static const struct of_device_id __maybe_unused clps711x_pwm_dt_ids[] = {
	{ .compatible = "cirrus,ep7209-pwm", },
	{ }
};
MODULE_DEVICE_TABLE(of, clps711x_pwm_dt_ids);

static struct platform_driver clps711x_pwm_driver = {
	.driver = {
		.name = "clps711x-pwm",
		.of_match_table = of_match_ptr(clps711x_pwm_dt_ids),
	},
	.probe = clps711x_pwm_probe,
};
module_platform_driver(clps711x_pwm_driver);

MODULE_AUTHOR("Alexander Shiyan <shc_work@mail.ru>");
MODULE_DESCRIPTION("Cirrus Logic CLPS711X PWM driver");
MODULE_LICENSE("GPL");
Commit	Line	Data
f236d188	1	// SPDX-License-Identifier: GPL-2.0+
7eb3f6ff AS	2	/*
7eb3f6ff AS	3	* Cirrus Logic CLPS711X PWM driver
f236d188	4	* Author: Alexander Shiyan <shc_work@mail.ru>
7eb3f6ff AS	5	*/
	6
	7	#include <linux/clk.h>
	8	#include <linux/io.h>
	9	#include <linux/module.h>
	10	#include <linux/of.h>
	11	#include <linux/platform_device.h>
	12	#include <linux/pwm.h>
	13
	14	struct clps711x_chip {
7eb3f6ff AS	15	void __iomem *pmpcon;
	16	struct clk *clk;
	17	spinlock_t lock;
	18	};
	19
	20	static inline struct clps711x_chip to_clps711x_chip(struct pwm_chip chip)
	21	{
5412170f	22	return pwmchip_get_drvdata(chip);
7eb3f6ff AS	23	}
7eb3f6ff AS	24
7eb3f6ff AS	25	static int clps711x_pwm_request(struct pwm_chip chip, struct pwm_device pwm)
	26	{
	27	struct clps711x_chip *priv = to_clps711x_chip(chip);
	28	unsigned int freq = clk_get_rate(priv->clk);
	29
	30	if (!freq)
	31	return -EINVAL;
	32
	33	/* Store constant period value */
e39c0df1	34	pwm->args.period = DIV_ROUND_CLOSEST(NSEC_PER_SEC, freq);
7eb3f6ff AS	35
	36	return 0;
	37	}
	38
4225cd01 UKK	39	static int clps711x_pwm_apply(struct pwm_chip chip, struct pwm_device pwm,
4225cd01 UKK	40	const struct pwm_state *state)
7eb3f6ff AS	41	{
7eb3f6ff AS	42	struct clps711x_chip *priv = to_clps711x_chip(chip);
4225cd01 UKK	43	/* PWM0 - bits 4..7, PWM1 - bits 8..11 */
	44	u32 shift = (pwm->hwpwm + 1) * 4;
	45	unsigned long flags;
	46	u32 pmpcon, val;
7eb3f6ff	47
4225cd01	48	if (state->polarity != PWM_POLARITY_NORMAL)
7eb3f6ff AS	49	return -EINVAL;
7eb3f6ff AS	50
4225cd01 UKK	51	if (state->period != pwm->args.period)
4225cd01 UKK	52	return -EINVAL;
7eb3f6ff	53
4225cd01 UKK	54	if (state->enabled)
	55	val = mul_u64_u64_div_u64(state->duty_cycle, 0xf, state->period);
	56	else
	57	val = 0;
7eb3f6ff	58
4225cd01	59	spin_lock_irqsave(&priv->lock, flags);
7eb3f6ff	60
4225cd01 UKK	61	pmpcon = readl(priv->pmpcon);
	62	pmpcon &= ~(0xf << shift);
	63	pmpcon \|= val << shift;
	64	writel(pmpcon, priv->pmpcon);
7eb3f6ff	65
4225cd01	66	spin_unlock_irqrestore(&priv->lock, flags);
7eb3f6ff	67
4225cd01	68	return 0;
7eb3f6ff AS	69	}
	70
	71	static const struct pwm_ops clps711x_pwm_ops = {
	72	.request = clps711x_pwm_request,
4225cd01	73	.apply = clps711x_pwm_apply,
7eb3f6ff AS	74	};
7eb3f6ff AS	75
7eb3f6ff AS	76	static int clps711x_pwm_probe(struct platform_device *pdev)
7eb3f6ff AS	77	{
5412170f	78	struct pwm_chip *chip;
7eb3f6ff	79	struct clps711x_chip *priv;
7eb3f6ff	80
5412170f UKK	81	chip = devm_pwmchip_alloc(&pdev->dev, 2, sizeof(*priv));
	82	if (IS_ERR(chip))
	83	return PTR_ERR(chip);
	84	priv = to_clps711x_chip(chip);
7eb3f6ff	85
3151b130	86	priv->pmpcon = devm_platform_ioremap_resource(pdev, 0);
7eb3f6ff AS	87	if (IS_ERR(priv->pmpcon))
	88	return PTR_ERR(priv->pmpcon);
	89
	90	priv->clk = devm_clk_get(&pdev->dev, NULL);
	91	if (IS_ERR(priv->clk))
	92	return PTR_ERR(priv->clk);
	93
5412170f	94	chip->ops = &clps711x_pwm_ops;
7eb3f6ff AS	95
	96	spin_lock_init(&priv->lock);
	97
5412170f	98	return devm_pwmchip_add(&pdev->dev, chip);
7eb3f6ff AS	99	}
	100
	101	static const struct of_device_id __maybe_unused clps711x_pwm_dt_ids[] = {
ba60ae1d	102	{ .compatible = "cirrus,ep7209-pwm", },
7eb3f6ff AS	103	{ }
	104	};
	105	MODULE_DEVICE_TABLE(of, clps711x_pwm_dt_ids);
	106
	107	static struct platform_driver clps711x_pwm_driver = {
	108	.driver = {
	109	.name = "clps711x-pwm",
7eb3f6ff AS	110	.of_match_table = of_match_ptr(clps711x_pwm_dt_ids),
	111	},
	112	.probe = clps711x_pwm_probe,
7eb3f6ff AS	113	};
	114	module_platform_driver(clps711x_pwm_driver);
	115
	116	MODULE_AUTHOR("Alexander Shiyan <shc_work@mail.ru>");
	117	MODULE_DESCRIPTION("Cirrus Logic CLPS711X PWM driver");
	118	MODULE_LICENSE("GPL");