drivers/pwm/pwm-cadence-ttc.c - platform/external/u-boot - Gitiles

 // SPDX-License-Identifier: GPL-2.0
 /*
  * (C) Copyright 2021 Xilinx, Inc. Michal Simek
  */

 #define LOG_CATEGORY UCLASS_PWM

 #include <clk.h>
 #include <common.h>
 #include <div64.h>
 #include <dm.h>
 #include <log.h>
 #include <pwm.h>
 #include <asm/io.h>
 #include <log.h>
 #include <div64.h>
 #include <linux/bitfield.h>
 #include <linux/math64.h>
 #include <linux/log2.h>
 #include <dm/device_compat.h>

 #define CLOCK_CONTROL		0
 #define COUNTER_CONTROL		0xc
 #define INTERVAL_COUNTER	0x24
 #define MATCH_1_COUNTER		0x30

 #define CLK_FALLING_EDGE	BIT(6)
 #define CLK_SRC_EXTERNAL	BIT(5)
 #define CLK_PRESCALE_MASK	GENMASK(4, 1)
 #define CLK_PRESCALE_ENABLE	BIT(0)

 #define COUNTER_WAVE_POL		BIT(6)
 #define COUNTER_WAVE_DISABLE		BIT(5)
 #define COUNTER_RESET			BIT(4)
 #define COUNTER_MATCH_ENABLE		BIT(3)
 #define COUNTER_DECREMENT_ENABLE	BIT(2)
 #define COUNTER_INTERVAL_ENABLE		BIT(1)
 #define COUNTER_COUNTING_DISABLE	BIT(0)

 #define NSEC_PER_SEC	1000000000L

 #define TTC_REG(reg, channel) ((reg) + (channel) * sizeof(u32))
 #define TTC_CLOCK_CONTROL(reg, channel) \
 	TTC_REG((reg) + CLOCK_CONTROL, (channel))
 #define TTC_COUNTER_CONTROL(reg, channel) \
 	TTC_REG((reg) + COUNTER_CONTROL, (channel))
 #define TTC_INTERVAL_COUNTER(reg, channel) \
 	TTC_REG((reg) + INTERVAL_COUNTER, (channel))
 #define TTC_MATCH_1_COUNTER(reg, channel) \
 	TTC_REG((reg) + MATCH_1_COUNTER, (channel))

 struct cadence_ttc_pwm_plat {
 	u8 *regs;
 	u32 timer_width;
 };

 struct cadence_ttc_pwm_priv {
 	u8 *regs;
 	u32 timer_width;
 	u32 timer_mask;
 	unsigned long frequency;
 	bool invert[2];
 };

 static int cadence_ttc_pwm_set_invert(struct udevice *dev, uint channel,
 				      bool polarity)
 {
 	struct cadence_ttc_pwm_priv *priv = dev_get_priv(dev);

 	if (channel > 2) {
 		dev_err(dev, "Unsupported channel number %d(max 2)\n", channel);
 		return -EINVAL;
 	}

 	priv->invert[channel] = polarity;

 	dev_dbg(dev, "polarity=%u. Please config PWM again\n", polarity);

 	return 0;
 }

 static int cadence_ttc_pwm_set_config(struct udevice *dev, uint channel,
 				      uint period_ns, uint duty_ns)
 {
 	struct cadence_ttc_pwm_priv *priv = dev_get_priv(dev);
 	u32 counter_ctrl, clock_ctrl;
 	int period_clocks, duty_clocks, prescaler;

 	dev_dbg(dev, "channel %d, duty %d/period %d ns\n", channel,
 		duty_ns, period_ns);

 	if (channel > 2) {
 		dev_err(dev, "Unsupported channel number %d(max 2)\n", channel);
 		return -EINVAL;
 	}

 	/* Make sure counter is stopped */
 	counter_ctrl = readl(TTC_COUNTER_CONTROL(priv->regs, channel));
 	setbits_le32(TTC_COUNTER_CONTROL(priv->regs, channel),
 		     COUNTER_COUNTING_DISABLE | COUNTER_WAVE_DISABLE);

 	/* Calculate period, prescaler and set clock control register */
 	period_clocks = div64_u64(((int64_t)period_ns * priv->frequency),
 				  NSEC_PER_SEC);

 	prescaler = ilog2(period_clocks) + 1 - priv->timer_width;
 	if (prescaler < 0)
 		prescaler = 0;

 	clock_ctrl = readl(TTC_CLOCK_CONTROL(priv->regs, channel));

 	if (!prescaler) {
 		clock_ctrl &= ~(CLK_PRESCALE_ENABLE | CLK_PRESCALE_MASK);
 	} else {
 		clock_ctrl &= ~CLK_PRESCALE_MASK;
 		clock_ctrl |= CLK_PRESCALE_ENABLE;
 		clock_ctrl |= FIELD_PREP(CLK_PRESCALE_MASK, prescaler - 1);
 	};

 	/* External source is not handled by this driver now */
 	clock_ctrl &= ~CLK_SRC_EXTERNAL;

 	writel(clock_ctrl, TTC_CLOCK_CONTROL(priv->regs, channel));

 	/* Calculate interval and set counter control value */
 	duty_clocks = div64_u64(((int64_t)duty_ns * priv->frequency),
 				NSEC_PER_SEC);

 	writel((period_clocks >> prescaler) & priv->timer_mask,
 	       TTC_INTERVAL_COUNTER(priv->regs, channel));
 	writel((duty_clocks >> prescaler) & priv->timer_mask,
 	       TTC_MATCH_1_COUNTER(priv->regs, channel));

 	/* Restore/reset counter */
 	counter_ctrl &= ~COUNTER_DECREMENT_ENABLE;
 	counter_ctrl |= COUNTER_INTERVAL_ENABLE |
 			COUNTER_RESET |
 			COUNTER_MATCH_ENABLE;

 	if (priv->invert[channel])
 		counter_ctrl |= COUNTER_WAVE_POL;
 	else
 		counter_ctrl &= ~COUNTER_WAVE_POL;

 	writel(counter_ctrl, TTC_COUNTER_CONTROL(priv->regs, channel));

 	dev_dbg(dev, "%d/%d clocks, prescaler 2^%d\n", duty_clocks,
 		period_clocks, prescaler);

 	return 0;
 };

 static int cadence_ttc_pwm_set_enable(struct udevice *dev, uint channel,
 				      bool enable)
 {
 	struct cadence_ttc_pwm_priv *priv = dev_get_priv(dev);

 	if (channel > 2) {
 		dev_err(dev, "Unsupported channel number %d(max 2)\n", channel);
 		return -EINVAL;
 	}

 	dev_dbg(dev, "Enable: %d, channel %d\n", enable, channel);

 	if (enable) {
 		clrbits_le32(TTC_COUNTER_CONTROL(priv->regs, channel),
 			     COUNTER_COUNTING_DISABLE |
 			     COUNTER_WAVE_DISABLE);
 		setbits_le32(TTC_COUNTER_CONTROL(priv->regs, channel),
 			     COUNTER_RESET);
 	} else {
 		setbits_le32(TTC_COUNTER_CONTROL(priv->regs, channel),
 			     COUNTER_COUNTING_DISABLE |
 			     COUNTER_WAVE_DISABLE);
 	}

 	return 0;
 };

 static int cadence_ttc_pwm_probe(struct udevice *dev)
 {
 	struct cadence_ttc_pwm_priv *priv = dev_get_priv(dev);
 	struct cadence_ttc_pwm_plat *plat = dev_get_plat(dev);
 	struct clk clk;
 	int ret;

 	priv->regs = plat->regs;
 	priv->timer_width = plat->timer_width;
 	priv->timer_mask = GENMASK(priv->timer_width - 1, 0);

 	ret = clk_get_by_index(dev, 0, &clk);
 	if (ret < 0) {
 		dev_err(dev, "failed to get clock\n");
 		return ret;
 	}

 	priv->frequency = clk_get_rate(&clk);
 	if (IS_ERR_VALUE(priv->frequency)) {
 		dev_err(dev, "failed to get rate\n");
 		return priv->frequency;
 	}
 	dev_dbg(dev, "Clk frequency: %ld\n", priv->frequency);

 	ret = clk_enable(&clk);
 	if (ret) {
 		dev_err(dev, "failed to enable clock\n");
 		return ret;
 	}

 	return 0;
 }

 static int cadence_ttc_pwm_of_to_plat(struct udevice *dev)
 {
 	struct cadence_ttc_pwm_plat *plat = dev_get_plat(dev);
 	const char *cells;

 	cells = dev_read_prop(dev, "#pwm-cells", NULL);
 	if (!cells)
 		return -EINVAL;

 	plat->regs = dev_read_addr_ptr(dev);

 	plat->timer_width = dev_read_u32_default(dev, "timer-width", 16);

 	return 0;
 }

 static int cadence_ttc_pwm_bind(struct udevice *dev)
 {
 	const char *cells;

 	cells = dev_read_prop(dev, "#pwm-cells", NULL);
 	if (!cells)
 		return -ENODEV;

 	return 0;
 }

 static const struct pwm_ops cadence_ttc_pwm_ops = {
 	.set_invert = cadence_ttc_pwm_set_invert,
 	.set_config = cadence_ttc_pwm_set_config,
 	.set_enable = cadence_ttc_pwm_set_enable,
 };

 static const struct udevice_id cadence_ttc_pwm_ids[] = {
 	{ .compatible = "cdns,ttc" },
 	{ }
 };

 U_BOOT_DRIVER(cadence_ttc_pwm) = {
 	.name = "cadence_ttc_pwm",
 	.id = UCLASS_PWM,
 	.of_match = cadence_ttc_pwm_ids,
 	.ops = &cadence_ttc_pwm_ops,
 	.bind = cadence_ttc_pwm_bind,
 	.of_to_plat = cadence_ttc_pwm_of_to_plat,
 	.probe = cadence_ttc_pwm_probe,
 	.priv_auto = sizeof(struct cadence_ttc_pwm_priv),
 	.plat_auto = sizeof(struct cadence_ttc_pwm_plat),
 };
	// SPDX-License-Identifier: GPL-2.0
	/*
	* (C) Copyright 2021 Xilinx, Inc. Michal Simek
	*/

	#define LOG_CATEGORY UCLASS_PWM

	#include <clk.h>
	#include <common.h>
	#include <div64.h>
	#include <dm.h>
	#include <log.h>
	#include <pwm.h>
	#include <asm/io.h>
	#include <log.h>
	#include <div64.h>
	#include <linux/bitfield.h>
	#include <linux/math64.h>
	#include <linux/log2.h>
	#include <dm/device_compat.h>

	#define CLOCK_CONTROL 0
	#define COUNTER_CONTROL 0xc
	#define INTERVAL_COUNTER 0x24
	#define MATCH_1_COUNTER 0x30

	#define CLK_FALLING_EDGE BIT(6)
	#define CLK_SRC_EXTERNAL BIT(5)
	#define CLK_PRESCALE_MASK GENMASK(4, 1)
	#define CLK_PRESCALE_ENABLE BIT(0)

	#define COUNTER_WAVE_POL BIT(6)
	#define COUNTER_WAVE_DISABLE BIT(5)
	#define COUNTER_RESET BIT(4)
	#define COUNTER_MATCH_ENABLE BIT(3)
	#define COUNTER_DECREMENT_ENABLE BIT(2)
	#define COUNTER_INTERVAL_ENABLE BIT(1)
	#define COUNTER_COUNTING_DISABLE BIT(0)

	#define NSEC_PER_SEC 1000000000L

	#define TTC_REG(reg, channel) ((reg) + (channel) * sizeof(u32))
	#define TTC_CLOCK_CONTROL(reg, channel) \
	TTC_REG((reg) + CLOCK_CONTROL, (channel))
	#define TTC_COUNTER_CONTROL(reg, channel) \
	TTC_REG((reg) + COUNTER_CONTROL, (channel))
	#define TTC_INTERVAL_COUNTER(reg, channel) \
	TTC_REG((reg) + INTERVAL_COUNTER, (channel))
	#define TTC_MATCH_1_COUNTER(reg, channel) \
	TTC_REG((reg) + MATCH_1_COUNTER, (channel))

	struct cadence_ttc_pwm_plat {
	u8 *regs;
	u32 timer_width;
	};

	struct cadence_ttc_pwm_priv {
	u8 *regs;
	u32 timer_width;
	u32 timer_mask;
	unsigned long frequency;
	bool invert[2];
	};

	static int cadence_ttc_pwm_set_invert(struct udevice *dev, uint channel,
	bool polarity)
	{
	struct cadence_ttc_pwm_priv *priv = dev_get_priv(dev);

	if (channel > 2) {
	dev_err(dev, "Unsupported channel number %d(max 2)\n", channel);
	return -EINVAL;
	}

	priv->invert[channel] = polarity;

	dev_dbg(dev, "polarity=%u. Please config PWM again\n", polarity);

	return 0;
	}

	static int cadence_ttc_pwm_set_config(struct udevice *dev, uint channel,
	uint period_ns, uint duty_ns)
	{
	struct cadence_ttc_pwm_priv *priv = dev_get_priv(dev);
	u32 counter_ctrl, clock_ctrl;
	int period_clocks, duty_clocks, prescaler;

	dev_dbg(dev, "channel %d, duty %d/period %d ns\n", channel,
	duty_ns, period_ns);

	if (channel > 2) {
	dev_err(dev, "Unsupported channel number %d(max 2)\n", channel);
	return -EINVAL;
	}

	/* Make sure counter is stopped */
	counter_ctrl = readl(TTC_COUNTER_CONTROL(priv->regs, channel));
	setbits_le32(TTC_COUNTER_CONTROL(priv->regs, channel),
	COUNTER_COUNTING_DISABLE \| COUNTER_WAVE_DISABLE);

	/* Calculate period, prescaler and set clock control register */
	period_clocks = div64_u64(((int64_t)period_ns * priv->frequency),
	NSEC_PER_SEC);

	prescaler = ilog2(period_clocks) + 1 - priv->timer_width;
	if (prescaler < 0)
	prescaler = 0;

	clock_ctrl = readl(TTC_CLOCK_CONTROL(priv->regs, channel));

	if (!prescaler) {
	clock_ctrl &= ~(CLK_PRESCALE_ENABLE \| CLK_PRESCALE_MASK);
	} else {
	clock_ctrl &= ~CLK_PRESCALE_MASK;
	clock_ctrl \|= CLK_PRESCALE_ENABLE;
	clock_ctrl \|= FIELD_PREP(CLK_PRESCALE_MASK, prescaler - 1);
	};

	/* External source is not handled by this driver now */
	clock_ctrl &= ~CLK_SRC_EXTERNAL;

	writel(clock_ctrl, TTC_CLOCK_CONTROL(priv->regs, channel));

	/* Calculate interval and set counter control value */
	duty_clocks = div64_u64(((int64_t)duty_ns * priv->frequency),
	NSEC_PER_SEC);

	writel((period_clocks >> prescaler) & priv->timer_mask,
	TTC_INTERVAL_COUNTER(priv->regs, channel));
	writel((duty_clocks >> prescaler) & priv->timer_mask,
	TTC_MATCH_1_COUNTER(priv->regs, channel));

	/* Restore/reset counter */
	counter_ctrl &= ~COUNTER_DECREMENT_ENABLE;
	counter_ctrl \|= COUNTER_INTERVAL_ENABLE \|
	COUNTER_RESET \|
	COUNTER_MATCH_ENABLE;

	if (priv->invert[channel])
	counter_ctrl \|= COUNTER_WAVE_POL;
	else
	counter_ctrl &= ~COUNTER_WAVE_POL;

	writel(counter_ctrl, TTC_COUNTER_CONTROL(priv->regs, channel));

	dev_dbg(dev, "%d/%d clocks, prescaler 2^%d\n", duty_clocks,
	period_clocks, prescaler);

	return 0;
	};

	static int cadence_ttc_pwm_set_enable(struct udevice *dev, uint channel,
	bool enable)
	{
	struct cadence_ttc_pwm_priv *priv = dev_get_priv(dev);

	if (channel > 2) {
	dev_err(dev, "Unsupported channel number %d(max 2)\n", channel);
	return -EINVAL;
	}

	dev_dbg(dev, "Enable: %d, channel %d\n", enable, channel);

	if (enable) {
	clrbits_le32(TTC_COUNTER_CONTROL(priv->regs, channel),
	COUNTER_COUNTING_DISABLE \|
	COUNTER_WAVE_DISABLE);
	setbits_le32(TTC_COUNTER_CONTROL(priv->regs, channel),
	COUNTER_RESET);
	} else {
	setbits_le32(TTC_COUNTER_CONTROL(priv->regs, channel),
	COUNTER_COUNTING_DISABLE \|
	COUNTER_WAVE_DISABLE);
	}

	return 0;
	};

	static int cadence_ttc_pwm_probe(struct udevice *dev)
	{
	struct cadence_ttc_pwm_priv *priv = dev_get_priv(dev);
	struct cadence_ttc_pwm_plat *plat = dev_get_plat(dev);
	struct clk clk;
	int ret;

	priv->regs = plat->regs;
	priv->timer_width = plat->timer_width;
	priv->timer_mask = GENMASK(priv->timer_width - 1, 0);

	ret = clk_get_by_index(dev, 0, &clk);
	if (ret < 0) {
	dev_err(dev, "failed to get clock\n");
	return ret;
	}

	priv->frequency = clk_get_rate(&clk);
	if (IS_ERR_VALUE(priv->frequency)) {
	dev_err(dev, "failed to get rate\n");
	return priv->frequency;
	}
	dev_dbg(dev, "Clk frequency: %ld\n", priv->frequency);

	ret = clk_enable(&clk);
	if (ret) {
	dev_err(dev, "failed to enable clock\n");
	return ret;
	}

	return 0;
	}

	static int cadence_ttc_pwm_of_to_plat(struct udevice *dev)
	{
	struct cadence_ttc_pwm_plat *plat = dev_get_plat(dev);
	const char *cells;

	cells = dev_read_prop(dev, "#pwm-cells", NULL);
	if (!cells)
	return -EINVAL;

	plat->regs = dev_read_addr_ptr(dev);

	plat->timer_width = dev_read_u32_default(dev, "timer-width", 16);

	return 0;
	}

	static int cadence_ttc_pwm_bind(struct udevice *dev)
	{
	const char *cells;

	cells = dev_read_prop(dev, "#pwm-cells", NULL);
	if (!cells)
	return -ENODEV;

	return 0;
	}

	static const struct pwm_ops cadence_ttc_pwm_ops = {
	.set_invert = cadence_ttc_pwm_set_invert,
	.set_config = cadence_ttc_pwm_set_config,
	.set_enable = cadence_ttc_pwm_set_enable,
	};

	static const struct udevice_id cadence_ttc_pwm_ids[] = {
	{ .compatible = "cdns,ttc" },
	{ }
	};

	U_BOOT_DRIVER(cadence_ttc_pwm) = {
	.name = "cadence_ttc_pwm",
	.id = UCLASS_PWM,
	.of_match = cadence_ttc_pwm_ids,
	.ops = &cadence_ttc_pwm_ops,
	.bind = cadence_ttc_pwm_bind,
	.of_to_plat = cadence_ttc_pwm_of_to_plat,
	.probe = cadence_ttc_pwm_probe,
	.priv_auto = sizeof(struct cadence_ttc_pwm_priv),
	.plat_auto = sizeof(struct cadence_ttc_pwm_plat),
	};