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

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * EHRPWM PWM driver
 *
 * Copyright (C) 2012 Texas Instruments, Inc. - https://www.ti.com/
 */

#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/pwm.h>
#include <linux/io.h>
#include <linux/err.h>
#include <linux/clk.h>
#include <linux/pm_runtime.h>
#include <linux/of_device.h>

/* EHRPWM registers and bits definitions */

/* Time base module registers */
#define TBCTL			0x00
#define TBPRD			0x0A

#define TBCTL_PRDLD_MASK	BIT(3)
#define TBCTL_PRDLD_SHDW	0
#define TBCTL_PRDLD_IMDT	BIT(3)
#define TBCTL_CLKDIV_MASK	(BIT(12) | BIT(11) | BIT(10) | BIT(9) | \
				BIT(8) | BIT(7))
#define TBCTL_CTRMODE_MASK	(BIT(1) | BIT(0))
#define TBCTL_CTRMODE_UP	0
#define TBCTL_CTRMODE_DOWN	BIT(0)
#define TBCTL_CTRMODE_UPDOWN	BIT(1)
#define TBCTL_CTRMODE_FREEZE	(BIT(1) | BIT(0))

#define TBCTL_HSPCLKDIV_SHIFT	7
#define TBCTL_CLKDIV_SHIFT	10

#define CLKDIV_MAX		7
#define HSPCLKDIV_MAX		7
#define PERIOD_MAX		0xFFFF

/* compare module registers */
#define CMPA			0x12
#define CMPB			0x14

/* Action qualifier module registers */
#define AQCTLA			0x16
#define AQCTLB			0x18
#define AQSFRC			0x1A
#define AQCSFRC			0x1C

#define AQCTL_CBU_MASK		(BIT(9) | BIT(8))
#define AQCTL_CBU_FRCLOW	BIT(8)
#define AQCTL_CBU_FRCHIGH	BIT(9)
#define AQCTL_CBU_FRCTOGGLE	(BIT(9) | BIT(8))
#define AQCTL_CAU_MASK		(BIT(5) | BIT(4))
#define AQCTL_CAU_FRCLOW	BIT(4)
#define AQCTL_CAU_FRCHIGH	BIT(5)
#define AQCTL_CAU_FRCTOGGLE	(BIT(5) | BIT(4))
#define AQCTL_PRD_MASK		(BIT(3) | BIT(2))
#define AQCTL_PRD_FRCLOW	BIT(2)
#define AQCTL_PRD_FRCHIGH	BIT(3)
#define AQCTL_PRD_FRCTOGGLE	(BIT(3) | BIT(2))
#define AQCTL_ZRO_MASK		(BIT(1) | BIT(0))
#define AQCTL_ZRO_FRCLOW	BIT(0)
#define AQCTL_ZRO_FRCHIGH	BIT(1)
#define AQCTL_ZRO_FRCTOGGLE	(BIT(1) | BIT(0))

#define AQCTL_CHANA_POLNORMAL	(AQCTL_CAU_FRCLOW | AQCTL_PRD_FRCHIGH | \
				AQCTL_ZRO_FRCHIGH)
#define AQCTL_CHANA_POLINVERSED	(AQCTL_CAU_FRCHIGH | AQCTL_PRD_FRCLOW | \
				AQCTL_ZRO_FRCLOW)
#define AQCTL_CHANB_POLNORMAL	(AQCTL_CBU_FRCLOW | AQCTL_PRD_FRCHIGH | \
				AQCTL_ZRO_FRCHIGH)
#define AQCTL_CHANB_POLINVERSED	(AQCTL_CBU_FRCHIGH | AQCTL_PRD_FRCLOW | \
				AQCTL_ZRO_FRCLOW)

#define AQSFRC_RLDCSF_MASK	(BIT(7) | BIT(6))
#define AQSFRC_RLDCSF_ZRO	0
#define AQSFRC_RLDCSF_PRD	BIT(6)
#define AQSFRC_RLDCSF_ZROPRD	BIT(7)
#define AQSFRC_RLDCSF_IMDT	(BIT(7) | BIT(6))

#define AQCSFRC_CSFB_MASK	(BIT(3) | BIT(2))
#define AQCSFRC_CSFB_FRCDIS	0
#define AQCSFRC_CSFB_FRCLOW	BIT(2)
#define AQCSFRC_CSFB_FRCHIGH	BIT(3)
#define AQCSFRC_CSFB_DISSWFRC	(BIT(3) | BIT(2))
#define AQCSFRC_CSFA_MASK	(BIT(1) | BIT(0))
#define AQCSFRC_CSFA_FRCDIS	0
#define AQCSFRC_CSFA_FRCLOW	BIT(0)
#define AQCSFRC_CSFA_FRCHIGH	BIT(1)
#define AQCSFRC_CSFA_DISSWFRC	(BIT(1) | BIT(0))

#define NUM_PWM_CHANNEL		2	/* EHRPWM channels */

struct ehrpwm_context {
	u16 tbctl;
	u16 tbprd;
	u16 cmpa;
	u16 cmpb;
	u16 aqctla;
	u16 aqctlb;
	u16 aqsfrc;
	u16 aqcsfrc;
};

struct ehrpwm_pwm_chip {
	struct pwm_chip chip;
	unsigned long clk_rate;
	void __iomem *mmio_base;
	unsigned long period_cycles[NUM_PWM_CHANNEL];
	enum pwm_polarity polarity[NUM_PWM_CHANNEL];
	struct clk *tbclk;
	struct ehrpwm_context ctx;
};

static inline struct ehrpwm_pwm_chip *to_ehrpwm_pwm_chip(struct pwm_chip *chip)
{
	return container_of(chip, struct ehrpwm_pwm_chip, chip);
}

static inline u16 ehrpwm_read(void __iomem *base, unsigned int offset)
{
	return readw(base + offset);
}

static inline void ehrpwm_write(void __iomem *base, unsigned int offset,
				u16 value)
{
	writew(value, base + offset);
}

static void ehrpwm_modify(void __iomem *base, unsigned int offset, u16 mask,
			  u16 value)
{
	unsigned short val;

	val = readw(base + offset);
	val &= ~mask;
	val |= value & mask;
	writew(val, base + offset);
}

/**
 * set_prescale_div -	Set up the prescaler divider function
 * @rqst_prescaler:	prescaler value min
 * @prescale_div:	prescaler value set
 * @tb_clk_div:		Time Base Control prescaler bits
 */
static int set_prescale_div(unsigned long rqst_prescaler, u16 *prescale_div,
			    u16 *tb_clk_div)
{
	unsigned int clkdiv, hspclkdiv;

	for (clkdiv = 0; clkdiv <= CLKDIV_MAX; clkdiv++) {
		for (hspclkdiv = 0; hspclkdiv <= HSPCLKDIV_MAX; hspclkdiv++) {
			/*
			 * calculations for prescaler value :
			 * prescale_div = HSPCLKDIVIDER * CLKDIVIDER.
			 * HSPCLKDIVIDER =  2 ** hspclkdiv
			 * CLKDIVIDER = (1),		if clkdiv == 0 *OR*
			 *		(2 * clkdiv),	if clkdiv != 0
			 *
			 * Configure prescale_div value such that period
			 * register value is less than 65535.
			 */

			*prescale_div = (1 << clkdiv) *
					(hspclkdiv ? (hspclkdiv * 2) : 1);
			if (*prescale_div > rqst_prescaler) {
				*tb_clk_div = (clkdiv << TBCTL_CLKDIV_SHIFT) |
					(hspclkdiv << TBCTL_HSPCLKDIV_SHIFT);
				return 0;
			}
		}
	}

	return 1;
}

static void configure_polarity(struct ehrpwm_pwm_chip *pc, int chan)
{
	u16 aqctl_val, aqctl_mask;
	unsigned int aqctl_reg;

	/*
	 * Configure PWM output to HIGH/LOW level on counter
	 * reaches compare register value and LOW/HIGH level
	 * on counter value reaches period register value and
	 * zero value on counter
	 */
	if (chan == 1) {
		aqctl_reg = AQCTLB;
		aqctl_mask = AQCTL_CBU_MASK;

		if (pc->polarity[chan] == PWM_POLARITY_INVERSED)
			aqctl_val = AQCTL_CHANB_POLINVERSED;
		else
			aqctl_val = AQCTL_CHANB_POLNORMAL;
	} else {
		aqctl_reg = AQCTLA;
		aqctl_mask = AQCTL_CAU_MASK;

		if (pc->polarity[chan] == PWM_POLARITY_INVERSED)
			aqctl_val = AQCTL_CHANA_POLINVERSED;
		else
			aqctl_val = AQCTL_CHANA_POLNORMAL;
	}

	aqctl_mask |= AQCTL_PRD_MASK | AQCTL_ZRO_MASK;
	ehrpwm_modify(pc->mmio_base, aqctl_reg, aqctl_mask, aqctl_val);
}

/*
 * period_ns = 10^9 * (ps_divval * period_cycles) / PWM_CLK_RATE
 * duty_ns   = 10^9 * (ps_divval * duty_cycles) / PWM_CLK_RATE
 */
static int ehrpwm_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
			     u64 duty_ns, u64 period_ns)
{
	struct ehrpwm_pwm_chip *pc = to_ehrpwm_pwm_chip(chip);
	u32 period_cycles, duty_cycles;
	u16 ps_divval, tb_divval;
	unsigned int i, cmp_reg;
	unsigned long long c;

	if (period_ns > NSEC_PER_SEC)
		return -ERANGE;

	c = pc->clk_rate;
	c = c * period_ns;
	do_div(c, NSEC_PER_SEC);
	period_cycles = (unsigned long)c;

	if (period_cycles < 1) {
		period_cycles = 1;
		duty_cycles = 1;
	} else {
		c = pc->clk_rate;
		c = c * duty_ns;
		do_div(c, NSEC_PER_SEC);
		duty_cycles = (unsigned long)c;
	}

	/*
	 * Period values should be same for multiple PWM channels as IP uses
	 * same period register for multiple channels.
	 */
	for (i = 0; i < NUM_PWM_CHANNEL; i++) {
		if (pc->period_cycles[i] &&
				(pc->period_cycles[i] != period_cycles)) {
			/*
			 * Allow channel to reconfigure period if no other
			 * channels being configured.
			 */
			if (i == pwm->hwpwm)
				continue;

			dev_err(chip->dev,
				"period value conflicts with channel %u\n",
				i);
			return -EINVAL;
		}
	}

	pc->period_cycles[pwm->hwpwm] = period_cycles;

	/* Configure clock prescaler to support Low frequency PWM wave */
	if (set_prescale_div(period_cycles/PERIOD_MAX, &ps_divval,
			     &tb_divval)) {
		dev_err(chip->dev, "Unsupported values\n");
		return -EINVAL;
	}

	pm_runtime_get_sync(chip->dev);

	/* Update clock prescaler values */
	ehrpwm_modify(pc->mmio_base, TBCTL, TBCTL_CLKDIV_MASK, tb_divval);

	/* Update period & duty cycle with presacler division */
	period_cycles = period_cycles / ps_divval;
	duty_cycles = duty_cycles / ps_divval;

	/* Configure shadow loading on Period register */
	ehrpwm_modify(pc->mmio_base, TBCTL, TBCTL_PRDLD_MASK, TBCTL_PRDLD_SHDW);

	ehrpwm_write(pc->mmio_base, TBPRD, period_cycles);

	/* Configure ehrpwm counter for up-count mode */
	ehrpwm_modify(pc->mmio_base, TBCTL, TBCTL_CTRMODE_MASK,
		      TBCTL_CTRMODE_UP);

	if (pwm->hwpwm == 1)
		/* Channel 1 configured with compare B register */
		cmp_reg = CMPB;
	else
		/* Channel 0 configured with compare A register */
		cmp_reg = CMPA;

	ehrpwm_write(pc->mmio_base, cmp_reg, duty_cycles);

	pm_runtime_put_sync(chip->dev);

	return 0;
}

static int ehrpwm_pwm_set_polarity(struct pwm_chip *chip,
				   struct pwm_device *pwm,
				   enum pwm_polarity polarity)
{
	struct ehrpwm_pwm_chip *pc = to_ehrpwm_pwm_chip(chip);

	/* Configuration of polarity in hardware delayed, do at enable */
	pc->polarity[pwm->hwpwm] = polarity;

	return 0;
}

static int ehrpwm_pwm_enable(struct pwm_chip *chip, struct pwm_device *pwm)
{
	struct ehrpwm_pwm_chip *pc = to_ehrpwm_pwm_chip(chip);
	u16 aqcsfrc_val, aqcsfrc_mask;
	int ret;

	/* Leave clock enabled on enabling PWM */
	pm_runtime_get_sync(chip->dev);

	/* Disabling Action Qualifier on PWM output */
	if (pwm->hwpwm) {
		aqcsfrc_val = AQCSFRC_CSFB_FRCDIS;
		aqcsfrc_mask = AQCSFRC_CSFB_MASK;
	} else {
		aqcsfrc_val = AQCSFRC_CSFA_FRCDIS;
		aqcsfrc_mask = AQCSFRC_CSFA_MASK;
	}

	/* Changes to shadow mode */
	ehrpwm_modify(pc->mmio_base, AQSFRC, AQSFRC_RLDCSF_MASK,
		      AQSFRC_RLDCSF_ZRO);

	ehrpwm_modify(pc->mmio_base, AQCSFRC, aqcsfrc_mask, aqcsfrc_val);

	/* Channels polarity can be configured from action qualifier module */
	configure_polarity(pc, pwm->hwpwm);

	/* Enable TBCLK */
	ret = clk_enable(pc->tbclk);
	if (ret) {
		dev_err(chip->dev, "Failed to enable TBCLK for %s: %d\n",
			dev_name(pc->chip.dev), ret);
		return ret;
	}

	return 0;
}

static void ehrpwm_pwm_disable(struct pwm_chip *chip, struct pwm_device *pwm)
{
	struct ehrpwm_pwm_chip *pc = to_ehrpwm_pwm_chip(chip);
	u16 aqcsfrc_val, aqcsfrc_mask;

	/* Action Qualifier puts PWM output low forcefully */
	if (pwm->hwpwm) {
		aqcsfrc_val = AQCSFRC_CSFB_FRCLOW;
		aqcsfrc_mask = AQCSFRC_CSFB_MASK;
	} else {
		aqcsfrc_val = AQCSFRC_CSFA_FRCLOW;
		aqcsfrc_mask = AQCSFRC_CSFA_MASK;
	}

	/* Update shadow register first before modifying active register */
	ehrpwm_modify(pc->mmio_base, AQSFRC, AQSFRC_RLDCSF_MASK,
		      AQSFRC_RLDCSF_ZRO);
	ehrpwm_modify(pc->mmio_base, AQCSFRC, aqcsfrc_mask, aqcsfrc_val);
	/*
	 * Changes to immediate action on Action Qualifier. This puts
	 * Action Qualifier control on PWM output from next TBCLK
	 */
	ehrpwm_modify(pc->mmio_base, AQSFRC, AQSFRC_RLDCSF_MASK,
		      AQSFRC_RLDCSF_IMDT);

	ehrpwm_modify(pc->mmio_base, AQCSFRC, aqcsfrc_mask, aqcsfrc_val);

	/* Disabling TBCLK on PWM disable */
	clk_disable(pc->tbclk);

	/* Disable clock on PWM disable */
	pm_runtime_put_sync(chip->dev);
}

static void ehrpwm_pwm_free(struct pwm_chip *chip, struct pwm_device *pwm)
{
	struct ehrpwm_pwm_chip *pc = to_ehrpwm_pwm_chip(chip);

	if (pwm_is_enabled(pwm)) {
		dev_warn(chip->dev, "Removing PWM device without disabling\n");
		pm_runtime_put_sync(chip->dev);
	}

	/* set period value to zero on free */
	pc->period_cycles[pwm->hwpwm] = 0;
}

static int ehrpwm_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) {
			ehrpwm_pwm_disable(chip, pwm);
			enabled = false;
		}

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

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

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

	if (!enabled)
		err = ehrpwm_pwm_enable(chip, pwm);

	return err;
}

static const struct pwm_ops ehrpwm_pwm_ops = {
	.free = ehrpwm_pwm_free,
	.apply = ehrpwm_pwm_apply,
	.owner = THIS_MODULE,
};

static const struct of_device_id ehrpwm_of_match[] = {
	{ .compatible = "ti,am3352-ehrpwm" },
	{ .compatible = "ti,am33xx-ehrpwm" },
	{},
};
MODULE_DEVICE_TABLE(of, ehrpwm_of_match);

static int ehrpwm_pwm_probe(struct platform_device *pdev)
{
	struct device_node *np = pdev->dev.of_node;
	struct ehrpwm_pwm_chip *pc;
	struct clk *clk;
	int ret;

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

	clk = devm_clk_get(&pdev->dev, "fck");
	if (IS_ERR(clk)) {
		if (of_device_is_compatible(np, "ti,am33xx-ecap")) {
			dev_warn(&pdev->dev, "Binding is obsolete.\n");
			clk = devm_clk_get(pdev->dev.parent, "fck");
		}
	}

	if (IS_ERR(clk))
		return dev_err_probe(&pdev->dev, PTR_ERR(clk), "Failed to get fck\n");

	pc->clk_rate = clk_get_rate(clk);
	if (!pc->clk_rate) {
		dev_err(&pdev->dev, "failed to get clock rate\n");
		return -EINVAL;
	}

	pc->chip.dev = &pdev->dev;
	pc->chip.ops = &ehrpwm_pwm_ops;
	pc->chip.npwm = NUM_PWM_CHANNEL;

	pc->mmio_base = devm_platform_ioremap_resource(pdev, 0);
	if (IS_ERR(pc->mmio_base))
		return PTR_ERR(pc->mmio_base);

	/* Acquire tbclk for Time Base EHRPWM submodule */
	pc->tbclk = devm_clk_get(&pdev->dev, "tbclk");
	if (IS_ERR(pc->tbclk))
		return dev_err_probe(&pdev->dev, PTR_ERR(pc->tbclk), "Failed to get tbclk\n");

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

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

	platform_set_drvdata(pdev, pc);
	pm_runtime_enable(&pdev->dev);

	return 0;

err_clk_unprepare:
	clk_unprepare(pc->tbclk);

	return ret;
}

static int ehrpwm_pwm_remove(struct platform_device *pdev)
{
	struct ehrpwm_pwm_chip *pc = platform_get_drvdata(pdev);

	pwmchip_remove(&pc->chip);

	clk_unprepare(pc->tbclk);

	pm_runtime_disable(&pdev->dev);

	return 0;
}

#ifdef CONFIG_PM_SLEEP
static void ehrpwm_pwm_save_context(struct ehrpwm_pwm_chip *pc)
{
	pm_runtime_get_sync(pc->chip.dev);

	pc->ctx.tbctl = ehrpwm_read(pc->mmio_base, TBCTL);
	pc->ctx.tbprd = ehrpwm_read(pc->mmio_base, TBPRD);
	pc->ctx.cmpa = ehrpwm_read(pc->mmio_base, CMPA);
	pc->ctx.cmpb = ehrpwm_read(pc->mmio_base, CMPB);
	pc->ctx.aqctla = ehrpwm_read(pc->mmio_base, AQCTLA);
	pc->ctx.aqctlb = ehrpwm_read(pc->mmio_base, AQCTLB);
	pc->ctx.aqsfrc = ehrpwm_read(pc->mmio_base, AQSFRC);
	pc->ctx.aqcsfrc = ehrpwm_read(pc->mmio_base, AQCSFRC);

	pm_runtime_put_sync(pc->chip.dev);
}

static void ehrpwm_pwm_restore_context(struct ehrpwm_pwm_chip *pc)
{
	ehrpwm_write(pc->mmio_base, TBPRD, pc->ctx.tbprd);
	ehrpwm_write(pc->mmio_base, CMPA, pc->ctx.cmpa);
	ehrpwm_write(pc->mmio_base, CMPB, pc->ctx.cmpb);
	ehrpwm_write(pc->mmio_base, AQCTLA, pc->ctx.aqctla);
	ehrpwm_write(pc->mmio_base, AQCTLB, pc->ctx.aqctlb);
	ehrpwm_write(pc->mmio_base, AQSFRC, pc->ctx.aqsfrc);
	ehrpwm_write(pc->mmio_base, AQCSFRC, pc->ctx.aqcsfrc);
	ehrpwm_write(pc->mmio_base, TBCTL, pc->ctx.tbctl);
}

static int ehrpwm_pwm_suspend(struct device *dev)
{
	struct ehrpwm_pwm_chip *pc = dev_get_drvdata(dev);
	unsigned int i;

	ehrpwm_pwm_save_context(pc);

	for (i = 0; i < pc->chip.npwm; i++) {
		struct pwm_device *pwm = &pc->chip.pwms[i];

		if (!pwm_is_enabled(pwm))
			continue;

		/* Disable explicitly if PWM is running */
		pm_runtime_put_sync(dev);
	}

	return 0;
}

static int ehrpwm_pwm_resume(struct device *dev)
{
	struct ehrpwm_pwm_chip *pc = dev_get_drvdata(dev);
	unsigned int i;

	for (i = 0; i < pc->chip.npwm; i++) {
		struct pwm_device *pwm = &pc->chip.pwms[i];

		if (!pwm_is_enabled(pwm))
			continue;

		/* Enable explicitly if PWM was running */
		pm_runtime_get_sync(dev);
	}

	ehrpwm_pwm_restore_context(pc);

	return 0;
}
#endif

static SIMPLE_DEV_PM_OPS(ehrpwm_pwm_pm_ops, ehrpwm_pwm_suspend,
			 ehrpwm_pwm_resume);

static struct platform_driver ehrpwm_pwm_driver = {
	.driver = {
		.name = "ehrpwm",
		.of_match_table = ehrpwm_of_match,
		.pm = &ehrpwm_pwm_pm_ops,
	},
	.probe = ehrpwm_pwm_probe,
	.remove = ehrpwm_pwm_remove,
};
module_platform_driver(ehrpwm_pwm_driver);

MODULE_DESCRIPTION("EHRPWM PWM driver");
MODULE_AUTHOR("Texas Instruments");
MODULE_LICENSE("GPL");
Commit	Line	Data
74ba9207	1	// SPDX-License-Identifier: GPL-2.0-or-later
19891b20 PA	2	/*
	3	* EHRPWM PWM driver
	4	*
216a094d	5	* Copyright (C) 2012 Texas Instruments, Inc. - https://www.ti.com/
19891b20 PA	6	*/
	7
	8	#include <linux/module.h>
	9	#include <linux/platform_device.h>
	10	#include <linux/pwm.h>
	11	#include <linux/io.h>
	12	#include <linux/err.h>
	13	#include <linux/clk.h>
	14	#include <linux/pm_runtime.h>
53ad9e8d PA	15	#include <linux/of_device.h>
53ad9e8d PA	16
19891b20 PA	17	/* EHRPWM registers and bits definitions */
	18
	19	/* Time base module registers */
	20	#define TBCTL 0x00
	21	#define TBPRD 0x0A
	22
19891b20 PA	23	#define TBCTL_PRDLD_MASK BIT(3)
	24	#define TBCTL_PRDLD_SHDW 0
	25	#define TBCTL_PRDLD_IMDT BIT(3)
	26	#define TBCTL_CLKDIV_MASK (BIT(12) \| BIT(11) \| BIT(10) \| BIT(9) \| \
	27	BIT(8) \| BIT(7))
	28	#define TBCTL_CTRMODE_MASK (BIT(1) \| BIT(0))
	29	#define TBCTL_CTRMODE_UP 0
	30	#define TBCTL_CTRMODE_DOWN BIT(0)
	31	#define TBCTL_CTRMODE_UPDOWN BIT(1)
	32	#define TBCTL_CTRMODE_FREEZE (BIT(1) \| BIT(0))
	33
	34	#define TBCTL_HSPCLKDIV_SHIFT 7
	35	#define TBCTL_CLKDIV_SHIFT 10
	36
	37	#define CLKDIV_MAX 7
	38	#define HSPCLKDIV_MAX 7
	39	#define PERIOD_MAX 0xFFFF
	40
	41	/* compare module registers */
	42	#define CMPA 0x12
	43	#define CMPB 0x14
	44
	45	/* Action qualifier module registers */
	46	#define AQCTLA 0x16
	47	#define AQCTLB 0x18
	48	#define AQSFRC 0x1A
	49	#define AQCSFRC 0x1C
	50
	51	#define AQCTL_CBU_MASK (BIT(9) \| BIT(8))
	52	#define AQCTL_CBU_FRCLOW BIT(8)
	53	#define AQCTL_CBU_FRCHIGH BIT(9)
	54	#define AQCTL_CBU_FRCTOGGLE (BIT(9) \| BIT(8))
	55	#define AQCTL_CAU_MASK (BIT(5) \| BIT(4))
	56	#define AQCTL_CAU_FRCLOW BIT(4)
	57	#define AQCTL_CAU_FRCHIGH BIT(5)
	58	#define AQCTL_CAU_FRCTOGGLE (BIT(5) \| BIT(4))
	59	#define AQCTL_PRD_MASK (BIT(3) \| BIT(2))
	60	#define AQCTL_PRD_FRCLOW BIT(2)
	61	#define AQCTL_PRD_FRCHIGH BIT(3)
	62	#define AQCTL_PRD_FRCTOGGLE (BIT(3) \| BIT(2))
	63	#define AQCTL_ZRO_MASK (BIT(1) \| BIT(0))
	64	#define AQCTL_ZRO_FRCLOW BIT(0)
	65	#define AQCTL_ZRO_FRCHIGH BIT(1)
	66	#define AQCTL_ZRO_FRCTOGGLE (BIT(1) \| BIT(0))
	67
daa5629b PA	68	#define AQCTL_CHANA_POLNORMAL (AQCTL_CAU_FRCLOW \| AQCTL_PRD_FRCHIGH \| \
	69	AQCTL_ZRO_FRCHIGH)
	70	#define AQCTL_CHANA_POLINVERSED (AQCTL_CAU_FRCHIGH \| AQCTL_PRD_FRCLOW \| \
	71	AQCTL_ZRO_FRCLOW)
	72	#define AQCTL_CHANB_POLNORMAL (AQCTL_CBU_FRCLOW \| AQCTL_PRD_FRCHIGH \| \
	73	AQCTL_ZRO_FRCHIGH)
	74	#define AQCTL_CHANB_POLINVERSED (AQCTL_CBU_FRCHIGH \| AQCTL_PRD_FRCLOW \| \
	75	AQCTL_ZRO_FRCLOW)
	76
19891b20 PA	77	#define AQSFRC_RLDCSF_MASK (BIT(7) \| BIT(6))
	78	#define AQSFRC_RLDCSF_ZRO 0
	79	#define AQSFRC_RLDCSF_PRD BIT(6)
	80	#define AQSFRC_RLDCSF_ZROPRD BIT(7)
	81	#define AQSFRC_RLDCSF_IMDT (BIT(7) \| BIT(6))
	82
	83	#define AQCSFRC_CSFB_MASK (BIT(3) \| BIT(2))
	84	#define AQCSFRC_CSFB_FRCDIS 0
	85	#define AQCSFRC_CSFB_FRCLOW BIT(2)
	86	#define AQCSFRC_CSFB_FRCHIGH BIT(3)
	87	#define AQCSFRC_CSFB_DISSWFRC (BIT(3) \| BIT(2))
	88	#define AQCSFRC_CSFA_MASK (BIT(1) \| BIT(0))
	89	#define AQCSFRC_CSFA_FRCDIS 0
	90	#define AQCSFRC_CSFA_FRCLOW BIT(0)
	91	#define AQCSFRC_CSFA_FRCHIGH BIT(1)
	92	#define AQCSFRC_CSFA_DISSWFRC (BIT(1) \| BIT(0))
	93
	94	#define NUM_PWM_CHANNEL 2 /* EHRPWM channels */
	95
0e2feb17 PA	96	struct ehrpwm_context {
	97	u16 tbctl;
	98	u16 tbprd;
	99	u16 cmpa;
	100	u16 cmpb;
	101	u16 aqctla;
	102	u16 aqctlb;
	103	u16 aqsfrc;
	104	u16 aqcsfrc;
	105	};
	106
19891b20	107	struct ehrpwm_pwm_chip {
d2c95e47 TR	108	struct pwm_chip chip;
	109	unsigned long clk_rate;
	110	void __iomem *mmio_base;
01b2d453	111	unsigned long period_cycles[NUM_PWM_CHANNEL];
daa5629b	112	enum pwm_polarity polarity[NUM_PWM_CHANNEL];
d2c95e47	113	struct clk *tbclk;
0e2feb17	114	struct ehrpwm_context ctx;
19891b20 PA	115	};
	116
	117	static inline struct ehrpwm_pwm_chip to_ehrpwm_pwm_chip(struct pwm_chip chip)
	118	{
	119	return container_of(chip, struct ehrpwm_pwm_chip, chip);
	120	}
	121
d2c95e47	122	static inline u16 ehrpwm_read(void __iomem *base, unsigned int offset)
0e2feb17 PA	123	{
	124	return readw(base + offset);
	125	}
	126
d2c95e47 TR	127	static inline void ehrpwm_write(void __iomem *base, unsigned int offset,
d2c95e47 TR	128	u16 value)
19891b20	129	{
d2c95e47	130	writew(value, base + offset);
19891b20 PA	131	}
19891b20 PA	132
d2c95e47 TR	133	static void ehrpwm_modify(void __iomem *base, unsigned int offset, u16 mask,
d2c95e47 TR	134	u16 value)
19891b20	135	{
d2c95e47	136	unsigned short val;
19891b20	137
d2c95e47 TR	138	val = readw(base + offset);
	139	val &= ~mask;
	140	val \|= value & mask;
	141	writew(val, base + offset);
19891b20 PA	142	}
	143
	144	/**
	145	* set_prescale_div - Set up the prescaler divider function
	146	* @rqst_prescaler: prescaler value min
	147	* @prescale_div: prescaler value set
	148	* @tb_clk_div: Time Base Control prescaler bits
	149	*/
d2c95e47 TR	150	static int set_prescale_div(unsigned long rqst_prescaler, u16 *prescale_div,
d2c95e47 TR	151	u16 *tb_clk_div)
19891b20 PA	152	{
	153	unsigned int clkdiv, hspclkdiv;
	154
	155	for (clkdiv = 0; clkdiv <= CLKDIV_MAX; clkdiv++) {
	156	for (hspclkdiv = 0; hspclkdiv <= HSPCLKDIV_MAX; hspclkdiv++) {
19891b20 PA	157	/*
	158	* calculations for prescaler value :
	159	* prescale_div = HSPCLKDIVIDER * CLKDIVIDER.
	160	* HSPCLKDIVIDER = 2 ** hspclkdiv
	161	* CLKDIVIDER = (1), if clkdiv == 0 OR
	162	* (2 * clkdiv), if clkdiv != 0
	163	*
	164	* Configure prescale_div value such that period
	165	* register value is less than 65535.
	166	*/
	167
	168	prescale_div = (1 << clkdiv)
	169	(hspclkdiv ? (hspclkdiv * 2) : 1);
	170	if (*prescale_div > rqst_prescaler) {
	171	*tb_clk_div = (clkdiv << TBCTL_CLKDIV_SHIFT) \|
	172	(hspclkdiv << TBCTL_HSPCLKDIV_SHIFT);
	173	return 0;
	174	}
	175	}
	176	}
d2c95e47	177
19891b20 PA	178	return 1;
	179	}
	180
daa5629b	181	static void configure_polarity(struct ehrpwm_pwm_chip *pc, int chan)
19891b20	182	{
d2c95e47 TR	183	u16 aqctl_val, aqctl_mask;
d2c95e47 TR	184	unsigned int aqctl_reg;
19891b20 PA	185
19891b20 PA	186	/*
daa5629b PA	187	* Configure PWM output to HIGH/LOW level on counter
	188	* reaches compare register value and LOW/HIGH level
	189	* on counter value reaches period register value and
	190	* zero value on counter
19891b20 PA	191	*/
	192	if (chan == 1) {
	193	aqctl_reg = AQCTLB;
19891b20	194	aqctl_mask = AQCTL_CBU_MASK;
daa5629b PA	195
	196	if (pc->polarity[chan] == PWM_POLARITY_INVERSED)
	197	aqctl_val = AQCTL_CHANB_POLINVERSED;
	198	else
	199	aqctl_val = AQCTL_CHANB_POLNORMAL;
19891b20	200	} else {
19891b20	201	aqctl_reg = AQCTLA;
19891b20	202	aqctl_mask = AQCTL_CAU_MASK;
daa5629b PA	203
	204	if (pc->polarity[chan] == PWM_POLARITY_INVERSED)
	205	aqctl_val = AQCTL_CHANA_POLINVERSED;
	206	else
	207	aqctl_val = AQCTL_CHANA_POLNORMAL;
19891b20 PA	208	}
19891b20 PA	209
19891b20	210	aqctl_mask \|= AQCTL_PRD_MASK \| AQCTL_ZRO_MASK;
daa5629b	211	ehrpwm_modify(pc->mmio_base, aqctl_reg, aqctl_mask, aqctl_val);
19891b20 PA	212	}
	213
	214	/*
	215	* period_ns = 10^9 * (ps_divval * period_cycles) / PWM_CLK_RATE
	216	* duty_ns = 10^9 * (ps_divval * duty_cycles) / PWM_CLK_RATE
	217	*/
	218	static int ehrpwm_pwm_config(struct pwm_chip chip, struct pwm_device pwm,
5f027d9b	219	u64 duty_ns, u64 period_ns)
19891b20 PA	220	{
19891b20 PA	221	struct ehrpwm_pwm_chip *pc = to_ehrpwm_pwm_chip(chip);
d2c95e47 TR	222	u32 period_cycles, duty_cycles;
	223	u16 ps_divval, tb_divval;
	224	unsigned int i, cmp_reg;
19891b20	225	unsigned long long c;
19891b20	226
c2d476a9	227	if (period_ns > NSEC_PER_SEC)
19891b20 PA	228	return -ERANGE;
	229
	230	c = pc->clk_rate;
	231	c = c * period_ns;
	232	do_div(c, NSEC_PER_SEC);
	233	period_cycles = (unsigned long)c;
	234
	235	if (period_cycles < 1) {
	236	period_cycles = 1;
	237	duty_cycles = 1;
	238	} else {
	239	c = pc->clk_rate;
	240	c = c * duty_ns;
	241	do_div(c, NSEC_PER_SEC);
	242	duty_cycles = (unsigned long)c;
	243	}
	244
01b2d453 PA	245	/*
	246	* Period values should be same for multiple PWM channels as IP uses
	247	* same period register for multiple channels.
	248	*/
	249	for (i = 0; i < NUM_PWM_CHANNEL; i++) {
	250	if (pc->period_cycles[i] &&
	251	(pc->period_cycles[i] != period_cycles)) {
	252	/*
	253	* Allow channel to reconfigure period if no other
	254	* channels being configured.
	255	*/
	256	if (i == pwm->hwpwm)
	257	continue;
	258
d2c95e47 TR	259	dev_err(chip->dev,
	260	"period value conflicts with channel %u\n",
	261	i);
01b2d453 PA	262	return -EINVAL;
	263	}
	264	}
	265
	266	pc->period_cycles[pwm->hwpwm] = period_cycles;
	267
19891b20 PA	268	/* Configure clock prescaler to support Low frequency PWM wave */
19891b20 PA	269	if (set_prescale_div(period_cycles/PERIOD_MAX, &ps_divval,
d2c95e47	270	&tb_divval)) {
19891b20 PA	271	dev_err(chip->dev, "Unsupported values\n");
	272	return -EINVAL;
	273	}
	274
	275	pm_runtime_get_sync(chip->dev);
	276
	277	/* Update clock prescaler values */
	278	ehrpwm_modify(pc->mmio_base, TBCTL, TBCTL_CLKDIV_MASK, tb_divval);
	279
	280	/* Update period & duty cycle with presacler division */
	281	period_cycles = period_cycles / ps_divval;
	282	duty_cycles = duty_cycles / ps_divval;
	283
	284	/* Configure shadow loading on Period register */
	285	ehrpwm_modify(pc->mmio_base, TBCTL, TBCTL_PRDLD_MASK, TBCTL_PRDLD_SHDW);
	286
	287	ehrpwm_write(pc->mmio_base, TBPRD, period_cycles);
	288
	289	/* Configure ehrpwm counter for up-count mode */
	290	ehrpwm_modify(pc->mmio_base, TBCTL, TBCTL_CTRMODE_MASK,
d2c95e47	291	TBCTL_CTRMODE_UP);
19891b20	292
daa5629b PA	293	if (pwm->hwpwm == 1)
	294	/* Channel 1 configured with compare B register */
	295	cmp_reg = CMPB;
	296	else
	297	/* Channel 0 configured with compare A register */
	298	cmp_reg = CMPA;
	299
	300	ehrpwm_write(pc->mmio_base, cmp_reg, duty_cycles);
	301
19891b20	302	pm_runtime_put_sync(chip->dev);
d2c95e47	303
19891b20 PA	304	return 0;
	305	}
	306
daa5629b	307	static int ehrpwm_pwm_set_polarity(struct pwm_chip *chip,
d2c95e47 TR	308	struct pwm_device *pwm,
d2c95e47 TR	309	enum pwm_polarity polarity)
daa5629b PA	310	{
	311	struct ehrpwm_pwm_chip *pc = to_ehrpwm_pwm_chip(chip);
	312
	313	/* Configuration of polarity in hardware delayed, do at enable */
	314	pc->polarity[pwm->hwpwm] = polarity;
d2c95e47	315
daa5629b PA	316	return 0;
	317	}
	318
19891b20 PA	319	static int ehrpwm_pwm_enable(struct pwm_chip chip, struct pwm_device pwm)
	320	{
	321	struct ehrpwm_pwm_chip *pc = to_ehrpwm_pwm_chip(chip);
d2c95e47	322	u16 aqcsfrc_val, aqcsfrc_mask;
0074b49b	323	int ret;
19891b20 PA	324
	325	/* Leave clock enabled on enabling PWM */
	326	pm_runtime_get_sync(chip->dev);
	327
	328	/* Disabling Action Qualifier on PWM output */
	329	if (pwm->hwpwm) {
	330	aqcsfrc_val = AQCSFRC_CSFB_FRCDIS;
	331	aqcsfrc_mask = AQCSFRC_CSFB_MASK;
	332	} else {
	333	aqcsfrc_val = AQCSFRC_CSFA_FRCDIS;
	334	aqcsfrc_mask = AQCSFRC_CSFA_MASK;
	335	}
	336
	337	/* Changes to shadow mode */
	338	ehrpwm_modify(pc->mmio_base, AQSFRC, AQSFRC_RLDCSF_MASK,
d2c95e47	339	AQSFRC_RLDCSF_ZRO);
19891b20 PA	340
	341	ehrpwm_modify(pc->mmio_base, AQCSFRC, aqcsfrc_mask, aqcsfrc_val);
	342
daa5629b PA	343	/* Channels polarity can be configured from action qualifier module */
	344	configure_polarity(pc, pwm->hwpwm);
	345
aa49d628	346	/* Enable TBCLK */
b388f15f	347	ret = clk_enable(pc->tbclk);
0074b49b	348	if (ret) {
d2c95e47 TR	349	dev_err(chip->dev, "Failed to enable TBCLK for %s: %d\n",
d2c95e47 TR	350	dev_name(pc->chip.dev), ret);
0074b49b PA	351	return ret;
0074b49b PA	352	}
d91861da	353
19891b20 PA	354	return 0;
	355	}
	356
	357	static void ehrpwm_pwm_disable(struct pwm_chip chip, struct pwm_device pwm)
	358	{
	359	struct ehrpwm_pwm_chip *pc = to_ehrpwm_pwm_chip(chip);
d2c95e47	360	u16 aqcsfrc_val, aqcsfrc_mask;
19891b20 PA	361
	362	/* Action Qualifier puts PWM output low forcefully */
	363	if (pwm->hwpwm) {
	364	aqcsfrc_val = AQCSFRC_CSFB_FRCLOW;
	365	aqcsfrc_mask = AQCSFRC_CSFB_MASK;
	366	} else {
	367	aqcsfrc_val = AQCSFRC_CSFA_FRCLOW;
	368	aqcsfrc_mask = AQCSFRC_CSFA_MASK;
	369	}
	370
38dabd91	371	/* Update shadow register first before modifying active register */
b00ef530 CV	372	ehrpwm_modify(pc->mmio_base, AQSFRC, AQSFRC_RLDCSF_MASK,
b00ef530 CV	373	AQSFRC_RLDCSF_ZRO);
38dabd91	374	ehrpwm_modify(pc->mmio_base, AQCSFRC, aqcsfrc_mask, aqcsfrc_val);
19891b20 PA	375	/*
	376	* Changes to immediate action on Action Qualifier. This puts
	377	* Action Qualifier control on PWM output from next TBCLK
	378	*/
	379	ehrpwm_modify(pc->mmio_base, AQSFRC, AQSFRC_RLDCSF_MASK,
d2c95e47	380	AQSFRC_RLDCSF_IMDT);
19891b20 PA	381
	382	ehrpwm_modify(pc->mmio_base, AQCSFRC, aqcsfrc_mask, aqcsfrc_val);
	383
d91861da	384	/* Disabling TBCLK on PWM disable */
b388f15f	385	clk_disable(pc->tbclk);
d91861da	386
19891b20 PA	387	/* Disable clock on PWM disable */
	388	pm_runtime_put_sync(chip->dev);
	389	}
	390
	391	static void ehrpwm_pwm_free(struct pwm_chip chip, struct pwm_device pwm)
	392	{
01b2d453 PA	393	struct ehrpwm_pwm_chip *pc = to_ehrpwm_pwm_chip(chip);
01b2d453 PA	394
5c31252c	395	if (pwm_is_enabled(pwm)) {
19891b20 PA	396	dev_warn(chip->dev, "Removing PWM device without disabling\n");
	397	pm_runtime_put_sync(chip->dev);
	398	}
01b2d453 PA	399
	400	/* set period value to zero on free */
	401	pc->period_cycles[pwm->hwpwm] = 0;
19891b20 PA	402	}
19891b20 PA	403
5f027d9b UKK	404	static int ehrpwm_pwm_apply(struct pwm_chip chip, struct pwm_device pwm,
	405	const struct pwm_state *state)
	406	{
	407	int err;
	408	bool enabled = pwm->state.enabled;
	409
	410	if (state->polarity != pwm->state.polarity) {
	411	if (enabled) {
	412	ehrpwm_pwm_disable(chip, pwm);
	413	enabled = false;
	414	}
	415
	416	err = ehrpwm_pwm_set_polarity(chip, pwm, state->polarity);
	417	if (err)
	418	return err;
	419	}
	420
	421	if (!state->enabled) {
	422	if (enabled)
	423	ehrpwm_pwm_disable(chip, pwm);
	424	return 0;
	425	}
	426
	427	err = ehrpwm_pwm_config(chip, pwm, state->duty_cycle, state->period);
	428	if (err)
	429	return err;
	430
	431	if (!enabled)
	432	err = ehrpwm_pwm_enable(chip, pwm);
	433
	434	return err;
	435	}
	436
19891b20	437	static const struct pwm_ops ehrpwm_pwm_ops = {
d2c95e47	438	.free = ehrpwm_pwm_free,
5f027d9b	439	.apply = ehrpwm_pwm_apply,
d2c95e47	440	.owner = THIS_MODULE,
19891b20 PA	441	};
19891b20 PA	442
53ad9e8d	443	static const struct of_device_id ehrpwm_of_match[] = {
d2c95e47 TR	444	{ .compatible = "ti,am3352-ehrpwm" },
d2c95e47 TR	445	{ .compatible = "ti,am33xx-ehrpwm" },
53ad9e8d PA	446	{},
	447	};
	448	MODULE_DEVICE_TABLE(of, ehrpwm_of_match);
	449
3e9fe83d	450	static int ehrpwm_pwm_probe(struct platform_device *pdev)
19891b20	451	{
ae5200d2	452	struct device_node *np = pdev->dev.of_node;
d2c95e47	453	struct ehrpwm_pwm_chip *pc;
19891b20	454	struct clk *clk;
d2c95e47	455	int ret;
19891b20 PA	456
19891b20 PA	457	pc = devm_kzalloc(&pdev->dev, sizeof(*pc), GFP_KERNEL);
5e348953	458	if (!pc)
19891b20	459	return -ENOMEM;
19891b20 PA	460
19891b20 PA	461	clk = devm_clk_get(&pdev->dev, "fck");
ae5200d2 CJF	462	if (IS_ERR(clk)) {
	463	if (of_device_is_compatible(np, "ti,am33xx-ecap")) {
	464	dev_warn(&pdev->dev, "Binding is obsolete.\n");
	465	clk = devm_clk_get(pdev->dev.parent, "fck");
	466	}
	467	}
	468
44db5363 GS	469	if (IS_ERR(clk))
44db5363 GS	470	return dev_err_probe(&pdev->dev, PTR_ERR(clk), "Failed to get fck\n");
19891b20 PA	471
	472	pc->clk_rate = clk_get_rate(clk);
	473	if (!pc->clk_rate) {
	474	dev_err(&pdev->dev, "failed to get clock rate\n");
	475	return -EINVAL;
	476	}
	477
	478	pc->chip.dev = &pdev->dev;
	479	pc->chip.ops = &ehrpwm_pwm_ops;
19891b20 PA	480	pc->chip.npwm = NUM_PWM_CHANNEL;
19891b20 PA	481
dc13c0f6	482	pc->mmio_base = devm_platform_ioremap_resource(pdev, 0);
6d4294d1 TR	483	if (IS_ERR(pc->mmio_base))
6d4294d1 TR	484	return PTR_ERR(pc->mmio_base);
19891b20	485
d91861da PA	486	/* Acquire tbclk for Time Base EHRPWM submodule */
d91861da PA	487	pc->tbclk = devm_clk_get(&pdev->dev, "tbclk");
44db5363 GS	488	if (IS_ERR(pc->tbclk))
44db5363 GS	489	return dev_err_probe(&pdev->dev, PTR_ERR(pc->tbclk), "Failed to get tbclk\n");
d91861da	490
b388f15f MB	491	ret = clk_prepare(pc->tbclk);
	492	if (ret < 0) {
	493	dev_err(&pdev->dev, "clk_prepare() failed: %d\n", ret);
	494	return ret;
	495	}
	496
19891b20 PA	497	ret = pwmchip_add(&pc->chip);
	498	if (ret < 0) {
	499	dev_err(&pdev->dev, "pwmchip_add() failed: %d\n", ret);
e2b5602a	500	goto err_clk_unprepare;
19891b20 PA	501	}
19891b20 PA	502
d870c80e	503	platform_set_drvdata(pdev, pc);
19891b20	504	pm_runtime_enable(&pdev->dev);
53ad9e8d	505
19891b20	506	return 0;
e2b5602a JH	507
	508	err_clk_unprepare:
	509	clk_unprepare(pc->tbclk);
	510
	511	return ret;
19891b20 PA	512	}
19891b20 PA	513
77f37917	514	static int ehrpwm_pwm_remove(struct platform_device *pdev)
19891b20 PA	515	{
	516	struct ehrpwm_pwm_chip *pc = platform_get_drvdata(pdev);
	517
1a0c97b6 UKK	518	pwmchip_remove(&pc->chip);
1a0c97b6 UKK	519
b388f15f MB	520	clk_unprepare(pc->tbclk);
b388f15f MB	521
19891b20	522	pm_runtime_disable(&pdev->dev);
d2c95e47	523
1a0c97b6	524	return 0;
19891b20 PA	525	}
19891b20 PA	526
af5935ec	527	#ifdef CONFIG_PM_SLEEP
b343a188	528	static void ehrpwm_pwm_save_context(struct ehrpwm_pwm_chip *pc)
0e2feb17 PA	529	{
0e2feb17 PA	530	pm_runtime_get_sync(pc->chip.dev);
d2c95e47	531
0e2feb17 PA	532	pc->ctx.tbctl = ehrpwm_read(pc->mmio_base, TBCTL);
	533	pc->ctx.tbprd = ehrpwm_read(pc->mmio_base, TBPRD);
	534	pc->ctx.cmpa = ehrpwm_read(pc->mmio_base, CMPA);
	535	pc->ctx.cmpb = ehrpwm_read(pc->mmio_base, CMPB);
	536	pc->ctx.aqctla = ehrpwm_read(pc->mmio_base, AQCTLA);
	537	pc->ctx.aqctlb = ehrpwm_read(pc->mmio_base, AQCTLB);
	538	pc->ctx.aqsfrc = ehrpwm_read(pc->mmio_base, AQSFRC);
	539	pc->ctx.aqcsfrc = ehrpwm_read(pc->mmio_base, AQCSFRC);
d2c95e47	540
0e2feb17 PA	541	pm_runtime_put_sync(pc->chip.dev);
	542	}
	543
b343a188	544	static void ehrpwm_pwm_restore_context(struct ehrpwm_pwm_chip *pc)
0e2feb17 PA	545	{
	546	ehrpwm_write(pc->mmio_base, TBPRD, pc->ctx.tbprd);
	547	ehrpwm_write(pc->mmio_base, CMPA, pc->ctx.cmpa);
	548	ehrpwm_write(pc->mmio_base, CMPB, pc->ctx.cmpb);
	549	ehrpwm_write(pc->mmio_base, AQCTLA, pc->ctx.aqctla);
	550	ehrpwm_write(pc->mmio_base, AQCTLB, pc->ctx.aqctlb);
	551	ehrpwm_write(pc->mmio_base, AQSFRC, pc->ctx.aqsfrc);
	552	ehrpwm_write(pc->mmio_base, AQCSFRC, pc->ctx.aqcsfrc);
	553	ehrpwm_write(pc->mmio_base, TBCTL, pc->ctx.tbctl);
	554	}
	555
	556	static int ehrpwm_pwm_suspend(struct device *dev)
	557	{
	558	struct ehrpwm_pwm_chip *pc = dev_get_drvdata(dev);
d2c95e47	559	unsigned int i;
0e2feb17 PA	560
0e2feb17 PA	561	ehrpwm_pwm_save_context(pc);
d2c95e47	562
0e2feb17 PA	563	for (i = 0; i < pc->chip.npwm; i++) {
	564	struct pwm_device *pwm = &pc->chip.pwms[i];
	565
5c31252c	566	if (!pwm_is_enabled(pwm))
0e2feb17 PA	567	continue;
	568
	569	/* Disable explicitly if PWM is running */
	570	pm_runtime_put_sync(dev);
	571	}
d2c95e47	572
0e2feb17 PA	573	return 0;
	574	}
	575
	576	static int ehrpwm_pwm_resume(struct device *dev)
	577	{
	578	struct ehrpwm_pwm_chip *pc = dev_get_drvdata(dev);
d2c95e47	579	unsigned int i;
0e2feb17 PA	580
	581	for (i = 0; i < pc->chip.npwm; i++) {
	582	struct pwm_device *pwm = &pc->chip.pwms[i];
	583
5c31252c	584	if (!pwm_is_enabled(pwm))
0e2feb17 PA	585	continue;
	586
	587	/* Enable explicitly if PWM was running */
	588	pm_runtime_get_sync(dev);
	589	}
d2c95e47	590
0e2feb17	591	ehrpwm_pwm_restore_context(pc);
d2c95e47	592
0e2feb17 PA	593	return 0;
0e2feb17 PA	594	}
29258b21	595	#endif
0e2feb17 PA	596
0e2feb17 PA	597	static SIMPLE_DEV_PM_OPS(ehrpwm_pwm_pm_ops, ehrpwm_pwm_suspend,
d2c95e47	598	ehrpwm_pwm_resume);
0e2feb17	599
19891b20 PA	600	static struct platform_driver ehrpwm_pwm_driver = {
19891b20 PA	601	.driver = {
d2c95e47	602	.name = "ehrpwm",
53ad9e8d	603	.of_match_table = ehrpwm_of_match,
d2c95e47	604	.pm = &ehrpwm_pwm_pm_ops,
19891b20 PA	605	},
19891b20 PA	606	.probe = ehrpwm_pwm_probe,
fd109112	607	.remove = ehrpwm_pwm_remove,
19891b20	608	};
19891b20 PA	609	module_platform_driver(ehrpwm_pwm_driver);
	610
	611	MODULE_DESCRIPTION("EHRPWM PWM driver");
	612	MODULE_AUTHOR("Texas Instruments");
	613	MODULE_LICENSE("GPL");