[mirror_ubuntu-bionic-kernel.git] / drivers / pwm / pwm-bfin.c

/*
 * Blackfin Pulse Width Modulation (PWM) core
 *
 * Copyright (c) 2011 Analog Devices Inc.
 *
 * Licensed under the GPL-2 or later.
 */

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

#include <asm/gptimers.h>
#include <asm/portmux.h>

struct bfin_pwm_chip {
	struct pwm_chip chip;
};

struct bfin_pwm {
	unsigned short pin;
};

static const unsigned short pwm_to_gptimer_per[] = {
	P_TMR0, P_TMR1, P_TMR2, P_TMR3, P_TMR4, P_TMR5,
	P_TMR6, P_TMR7, P_TMR8, P_TMR9, P_TMR10, P_TMR11,
};

static int bfin_pwm_request(struct pwm_chip *chip, struct pwm_device *pwm)
{
	struct bfin_pwm *priv;
	int ret;

	if (pwm->hwpwm >= ARRAY_SIZE(pwm_to_gptimer_per))
		return -EINVAL;

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

	priv->pin = pwm_to_gptimer_per[pwm->hwpwm];

	ret = peripheral_request(priv->pin, NULL);
	if (ret) {
		kfree(priv);
		return ret;
	}

	pwm_set_chip_data(pwm, priv);

	return 0;
}

static void bfin_pwm_free(struct pwm_chip *chip, struct pwm_device *pwm)
{
	struct bfin_pwm *priv = pwm_get_chip_data(pwm);

	if (priv) {
		peripheral_free(priv->pin);
		kfree(priv);
	}
}

static int bfin_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
		int duty_ns, int period_ns)
{
	struct bfin_pwm *priv = pwm_get_chip_data(pwm);
	unsigned long period, duty;
	unsigned long long val;

	val = (unsigned long long)get_sclk() * period_ns;
	do_div(val, NSEC_PER_SEC);
	period = val;

	val = (unsigned long long)period * duty_ns;
	do_div(val, period_ns);
	duty = period - val;

	if (duty >= period)
		duty = period - 1;

	set_gptimer_config(priv->pin, TIMER_MODE_PWM | TIMER_PERIOD_CNT);
	set_gptimer_pwidth(priv->pin, duty);
	set_gptimer_period(priv->pin, period);

	return 0;
}

static int bfin_pwm_enable(struct pwm_chip *chip, struct pwm_device *pwm)
{
	struct bfin_pwm *priv = pwm_get_chip_data(pwm);

	enable_gptimer(priv->pin);

	return 0;
}

static void bfin_pwm_disable(struct pwm_chip *chip, struct pwm_device *pwm)
{
	struct bfin_pwm *priv = pwm_get_chip_data(pwm);

	disable_gptimer(priv->pin);
}

static struct pwm_ops bfin_pwm_ops = {
	.request = bfin_pwm_request,
	.free = bfin_pwm_free,
	.config = bfin_pwm_config,
	.enable = bfin_pwm_enable,
	.disable = bfin_pwm_disable,
	.owner = THIS_MODULE,
};

static int bfin_pwm_probe(struct platform_device *pdev)
{
	struct bfin_pwm_chip *pwm;
	int ret;

	pwm = devm_kzalloc(&pdev->dev, sizeof(*pwm), GFP_KERNEL);
	if (!pwm) {
		dev_err(&pdev->dev, "failed to allocate memory\n");
		return -ENOMEM;
	}

	platform_set_drvdata(pdev, pwm);

	pwm->chip.dev = &pdev->dev;
	pwm->chip.ops = &bfin_pwm_ops;
	pwm->chip.base = -1;
	pwm->chip.npwm = 12;

	ret = pwmchip_add(&pwm->chip);
	if (ret < 0) {
		dev_err(&pdev->dev, "pwmchip_add() failed: %d\n", ret);
		return ret;
	}

	return 0;
}

static int __devexit bfin_pwm_remove(struct platform_device *pdev)
{
	struct bfin_pwm_chip *pwm = platform_get_drvdata(pdev);

	return pwmchip_remove(&pwm->chip);
}

static struct platform_driver bfin_pwm_driver = {
	.driver = {
		.name = "bfin-pwm",
	},
	.probe = bfin_pwm_probe,
	.remove = __devexit_p(bfin_pwm_remove),
};

module_platform_driver(bfin_pwm_driver);

MODULE_LICENSE("GPL");
Commit	Line	Data
a4315e3c TR	1	/*
	2	* Blackfin Pulse Width Modulation (PWM) core
	3	*
	4	* Copyright (c) 2011 Analog Devices Inc.
	5	*
	6	* Licensed under the GPL-2 or later.
	7	*/
	8
	9	#include <linux/module.h>
	10	#include <linux/platform_device.h>
	11	#include <linux/pwm.h>
	12	#include <linux/slab.h>
	13
	14	#include <asm/gptimers.h>
	15	#include <asm/portmux.h>
	16
	17	struct bfin_pwm_chip {
	18	struct pwm_chip chip;
	19	};
	20
	21	struct bfin_pwm {
	22	unsigned short pin;
	23	};
	24
	25	static const unsigned short pwm_to_gptimer_per[] = {
	26	P_TMR0, P_TMR1, P_TMR2, P_TMR3, P_TMR4, P_TMR5,
	27	P_TMR6, P_TMR7, P_TMR8, P_TMR9, P_TMR10, P_TMR11,
	28	};
	29
	30	static int bfin_pwm_request(struct pwm_chip chip, struct pwm_device pwm)
	31	{
	32	struct bfin_pwm *priv;
	33	int ret;
	34
	35	if (pwm->hwpwm >= ARRAY_SIZE(pwm_to_gptimer_per))
	36	return -EINVAL;
	37
	38	priv = kzalloc(sizeof(*priv), GFP_KERNEL);
	39	if (!priv)
	40	return -ENOMEM;
	41
	42	priv->pin = pwm_to_gptimer_per[pwm->hwpwm];
	43
	44	ret = peripheral_request(priv->pin, NULL);
	45	if (ret) {
	46	kfree(priv);
	47	return ret;
	48	}
	49
	50	pwm_set_chip_data(pwm, priv);
	51
	52	return 0;
	53	}
	54
	55	static void bfin_pwm_free(struct pwm_chip chip, struct pwm_device pwm)
	56	{
	57	struct bfin_pwm *priv = pwm_get_chip_data(pwm);
	58
	59	if (priv) {
	60	peripheral_free(priv->pin);
	61	kfree(priv);
	62	}
	63	}
	64
65	static int bfin_pwm_config(struct pwm_chip chip, struct pwm_device pwm,
66	int duty_ns, int period_ns)
67	{
68	struct bfin_pwm *priv = pwm_get_chip_data(pwm);
69	unsigned long period, duty;
70	unsigned long long val;
71
a4315e3c TR	72	val = (unsigned long long)get_sclk() * period_ns;
	73	do_div(val, NSEC_PER_SEC);
	74	period = val;
	75
	76	val = (unsigned long long)period * duty_ns;
	77	do_div(val, period_ns);
	78	duty = period - val;
	79
	80	if (duty >= period)
	81	duty = period - 1;
	82
	83	set_gptimer_config(priv->pin, TIMER_MODE_PWM \| TIMER_PERIOD_CNT);
	84	set_gptimer_pwidth(priv->pin, duty);
	85	set_gptimer_period(priv->pin, period);
	86
	87	return 0;
	88	}
	89
	90	static int bfin_pwm_enable(struct pwm_chip chip, struct pwm_device pwm)
	91	{
	92	struct bfin_pwm *priv = pwm_get_chip_data(pwm);
	93
	94	enable_gptimer(priv->pin);
	95
	96	return 0;
	97	}
	98
	99	static void bfin_pwm_disable(struct pwm_chip chip, struct pwm_device pwm)
	100	{
	101	struct bfin_pwm *priv = pwm_get_chip_data(pwm);
	102
	103	disable_gptimer(priv->pin);
	104	}
	105
	106	static struct pwm_ops bfin_pwm_ops = {
	107	.request = bfin_pwm_request,
	108	.free = bfin_pwm_free,
	109	.config = bfin_pwm_config,
	110	.enable = bfin_pwm_enable,
	111	.disable = bfin_pwm_disable,
	112	.owner = THIS_MODULE,
	113	};
	114
	115	static int bfin_pwm_probe(struct platform_device *pdev)
	116	{
	117	struct bfin_pwm_chip *pwm;
	118	int ret;
	119
	120	pwm = devm_kzalloc(&pdev->dev, sizeof(*pwm), GFP_KERNEL);
	121	if (!pwm) {
	122	dev_err(&pdev->dev, "failed to allocate memory\n");
	123	return -ENOMEM;
	124	}
	125
	126	platform_set_drvdata(pdev, pwm);
	127
	128	pwm->chip.dev = &pdev->dev;
	129	pwm->chip.ops = &bfin_pwm_ops;
	130	pwm->chip.base = -1;
	131	pwm->chip.npwm = 12;
	132
	133	ret = pwmchip_add(&pwm->chip);
	134	if (ret < 0) {
	135	dev_err(&pdev->dev, "pwmchip_add() failed: %d\n", ret);
136	return ret;
137	}
138
139	return 0;
140	}
141
142	static int __devexit bfin_pwm_remove(struct platform_device *pdev)
143	{
144	struct bfin_pwm_chip *pwm = platform_get_drvdata(pdev);
145
b50675dc	146	return pwmchip_remove(&pwm->chip);
a4315e3c TR	147	}
	148
	149	static struct platform_driver bfin_pwm_driver = {
	150	.driver = {
	151	.name = "bfin-pwm",
	152	},
	153	.probe = bfin_pwm_probe,
	154	.remove = __devexit_p(bfin_pwm_remove),
	155	};
	156
	157	module_platform_driver(bfin_pwm_driver);
	158
	159	MODULE_LICENSE("GPL");