[linux-2.6-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 {
	struct pwm_chip chip;
	void __iomem *pmpcon;
	struct clk *clk;
	spinlock_t lock;
};

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

static void clps711x_pwm_update_val(struct clps711x_chip *priv, u32 n, u32 v)
{
	/* PWM0 - bits 4..7, PWM1 - bits 8..11 */
	u32 shift = (n + 1) * 4;
	unsigned long flags;
	u32 tmp;

	spin_lock_irqsave(&priv->lock, flags);

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

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

static unsigned int clps711x_get_duty(struct pwm_device *pwm, unsigned int v)
{
	/* Duty cycle 0..15 max */
	return DIV_ROUND_CLOSEST(v * 0xf, pwm->args.period);
}

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_config(struct pwm_chip *chip, struct pwm_device *pwm,
			       int duty_ns, int period_ns)
{
	struct clps711x_chip *priv = to_clps711x_chip(chip);
	unsigned int duty;

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

	duty = clps711x_get_duty(pwm, duty_ns);
	clps711x_pwm_update_val(priv, pwm->hwpwm, duty);

	return 0;
}

static int clps711x_pwm_enable(struct pwm_chip *chip, struct pwm_device *pwm)
{
	struct clps711x_chip *priv = to_clps711x_chip(chip);
	unsigned int duty;

	duty = clps711x_get_duty(pwm, pwm_get_duty_cycle(pwm));
	clps711x_pwm_update_val(priv, pwm->hwpwm, duty);

	return 0;
}

static void clps711x_pwm_disable(struct pwm_chip *chip, struct pwm_device *pwm)
{
	struct clps711x_chip *priv = to_clps711x_chip(chip);

	clps711x_pwm_update_val(priv, pwm->hwpwm, 0);
}

static const struct pwm_ops clps711x_pwm_ops = {
	.request = clps711x_pwm_request,
	.config = clps711x_pwm_config,
	.enable = clps711x_pwm_enable,
	.disable = clps711x_pwm_disable,
	.owner = THIS_MODULE,
};

static struct pwm_device *clps711x_pwm_xlate(struct pwm_chip *chip,
					     const struct of_phandle_args *args)
{
	if (args->args[0] >= chip->npwm)
		return ERR_PTR(-EINVAL);

	return pwm_request_from_chip(chip, args->args[0], NULL);
}

static int clps711x_pwm_probe(struct platform_device *pdev)
{
	struct clps711x_chip *priv;
	struct resource *res;

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

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	priv->pmpcon = devm_ioremap_resource(&pdev->dev, res);
	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);

	priv->chip.ops = &clps711x_pwm_ops;
	priv->chip.dev = &pdev->dev;
	priv->chip.base = -1;
	priv->chip.npwm = 2;
	priv->chip.of_xlate = clps711x_pwm_xlate;
	priv->chip.of_pwm_n_cells = 1;

	spin_lock_init(&priv->lock);

	platform_set_drvdata(pdev, priv);

	return pwmchip_add(&priv->chip);
}

static int clps711x_pwm_remove(struct platform_device *pdev)
{
	struct clps711x_chip *priv = platform_get_drvdata(pdev);

	return pwmchip_remove(&priv->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,
	.remove = clps711x_pwm_remove,
};
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 {
	15	struct pwm_chip chip;
	16	void __iomem *pmpcon;
	17	struct clk *clk;
	18	spinlock_t lock;
	19	};
	20
	21	static inline struct clps711x_chip to_clps711x_chip(struct pwm_chip chip)
	22	{
	23	return container_of(chip, struct clps711x_chip, chip);
	24	}
	25
	26	static void clps711x_pwm_update_val(struct clps711x_chip *priv, u32 n, u32 v)
	27	{
	28	/* PWM0 - bits 4..7, PWM1 - bits 8..11 */
	29	u32 shift = (n + 1) * 4;
	30	unsigned long flags;
	31	u32 tmp;
	32
	33	spin_lock_irqsave(&priv->lock, flags);
	34
	35	tmp = readl(priv->pmpcon);
	36	tmp &= ~(0xf << shift);
	37	tmp \|= v << shift;
	38	writel(tmp, priv->pmpcon);
	39
	40	spin_unlock_irqrestore(&priv->lock, flags);
	41	}
	42
	43	static unsigned int clps711x_get_duty(struct pwm_device *pwm, unsigned int v)
	44	{
	45	/* Duty cycle 0..15 max */
b0f17570	46	return DIV_ROUND_CLOSEST(v * 0xf, pwm->args.period);
7eb3f6ff AS	47	}
	48
	49	static int clps711x_pwm_request(struct pwm_chip chip, struct pwm_device pwm)
	50	{
	51	struct clps711x_chip *priv = to_clps711x_chip(chip);
	52	unsigned int freq = clk_get_rate(priv->clk);
	53
	54	if (!freq)
	55	return -EINVAL;
	56
	57	/* Store constant period value */
e39c0df1	58	pwm->args.period = DIV_ROUND_CLOSEST(NSEC_PER_SEC, freq);
7eb3f6ff AS	59
	60	return 0;
	61	}
	62
	63	static int clps711x_pwm_config(struct pwm_chip chip, struct pwm_device pwm,
	64	int duty_ns, int period_ns)
	65	{
	66	struct clps711x_chip *priv = to_clps711x_chip(chip);
	67	unsigned int duty;
	68
b0f17570	69	if (period_ns != pwm->args.period)
7eb3f6ff AS	70	return -EINVAL;
	71
	72	duty = clps711x_get_duty(pwm, duty_ns);
	73	clps711x_pwm_update_val(priv, pwm->hwpwm, duty);
	74
	75	return 0;
	76	}
	77
	78	static int clps711x_pwm_enable(struct pwm_chip chip, struct pwm_device pwm)
	79	{
	80	struct clps711x_chip *priv = to_clps711x_chip(chip);
	81	unsigned int duty;
	82
	83	duty = clps711x_get_duty(pwm, pwm_get_duty_cycle(pwm));
	84	clps711x_pwm_update_val(priv, pwm->hwpwm, duty);
	85
	86	return 0;
	87	}
	88
	89	static void clps711x_pwm_disable(struct pwm_chip chip, struct pwm_device pwm)
	90	{
	91	struct clps711x_chip *priv = to_clps711x_chip(chip);
	92
	93	clps711x_pwm_update_val(priv, pwm->hwpwm, 0);
	94	}
	95
	96	static const struct pwm_ops clps711x_pwm_ops = {
	97	.request = clps711x_pwm_request,
	98	.config = clps711x_pwm_config,
	99	.enable = clps711x_pwm_enable,
	100	.disable = clps711x_pwm_disable,
	101	.owner = THIS_MODULE,
	102	};
	103
	104	static struct pwm_device clps711x_pwm_xlate(struct pwm_chip chip,
	105	const struct of_phandle_args *args)
	106	{
	107	if (args->args[0] >= chip->npwm)
	108	return ERR_PTR(-EINVAL);
	109
	110	return pwm_request_from_chip(chip, args->args[0], NULL);
	111	}
	112
	113	static int clps711x_pwm_probe(struct platform_device *pdev)
	114	{
	115	struct clps711x_chip *priv;
	116	struct resource *res;
	117
	118	priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
	119	if (!priv)
	120	return -ENOMEM;
	121
	122	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	123	priv->pmpcon = devm_ioremap_resource(&pdev->dev, res);
	124	if (IS_ERR(priv->pmpcon))
	125	return PTR_ERR(priv->pmpcon);
	126
	127	priv->clk = devm_clk_get(&pdev->dev, NULL);
	128	if (IS_ERR(priv->clk))
	129	return PTR_ERR(priv->clk);
	130
	131	priv->chip.ops = &clps711x_pwm_ops;
	132	priv->chip.dev = &pdev->dev;
	133	priv->chip.base = -1;
134	priv->chip.npwm = 2;
135	priv->chip.of_xlate = clps711x_pwm_xlate;
136	priv->chip.of_pwm_n_cells = 1;
137
138	spin_lock_init(&priv->lock);
139
140	platform_set_drvdata(pdev, priv);
141
142	return pwmchip_add(&priv->chip);
143	}
144
145	static int clps711x_pwm_remove(struct platform_device *pdev)
146	{
147	struct clps711x_chip *priv = platform_get_drvdata(pdev);
148
149	return pwmchip_remove(&priv->chip);
150	}
151
152	static const struct of_device_id __maybe_unused clps711x_pwm_dt_ids[] = {
ba60ae1d	153	{ .compatible = "cirrus,ep7209-pwm", },
7eb3f6ff AS	154	{ }
	155	};
	156	MODULE_DEVICE_TABLE(of, clps711x_pwm_dt_ids);
	157
	158	static struct platform_driver clps711x_pwm_driver = {
	159	.driver = {
	160	.name = "clps711x-pwm",
7eb3f6ff AS	161	.of_match_table = of_match_ptr(clps711x_pwm_dt_ids),
	162	},
	163	.probe = clps711x_pwm_probe,
	164	.remove = clps711x_pwm_remove,
	165	};
	166	module_platform_driver(clps711x_pwm_driver);
	167
	168	MODULE_AUTHOR("Alexander Shiyan <shc_work@mail.ru>");
	169	MODULE_DESCRIPTION("Cirrus Logic CLPS711X PWM driver");
	170	MODULE_LICENSE("GPL");