BPI-CM9-Linux/aml-comp/kernel/aml-6.12/common_drivers/drivers/pwm/pwm-meson.c

// SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause
/*
 * PWM controller driver for Amlogic Meson SoCs.
 *
 * This PWM is only a set of Gates, Dividers and Counters:
 * PWM output is achieved by calculating a clock that permits calculating
 * two periods (low and high). The counter then has to be set to switch after
 * N cycles for the first half period.
 * The hardware has no "polarity" setting. This driver reverses the period
 * cycles (the low length is inverted with the high length) for
 * PWM_POLARITY_INVERSED. This means that .get_state cannot read the polarity
 * from the hardware.
 * Setting the duty cycle will disable and re-enable the PWM output.
 * Disabling the PWM stops the output immediately (without waiting for the
 * current period to complete first).
 *
 * The public S912 (GXM) datasheet contains some documentation for this PWM
 * controller starting on page 543:
 * https://dl.khadas.com/Hardware/VIM2/Datasheet/S912_Datasheet_V0.220170314publicversion-Wesion.pdf
 * An updated version of this IP block is found in S922X (G12B) SoCs. The
 * datasheet contains the description for this IP block revision starting at
 * page 1084:
 * https://dn.odroid.com/S922X/ODROID-N2/Datasheet/S922X_Public_Datasheet_V0.2.pdf
 *
 * Copyright (c) 2016 BayLibre, SAS.
 * Author: Neil Armstrong <[email protected]>
 * Copyright (C) 2014 Amlogic, Inc.
 */

#include <linux/bitfield.h>
#include <linux/bits.h>
#include <linux/clk.h>
#include <linux/clk-provider.h>
#include <linux/err.h>
#include <linux/io.h>
#include <linux/kernel.h>
#include <linux/math64.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/platform_device.h>
#include <linux/pwm.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/pinctrl/consumer.h>

#ifdef CONFIG_AMLOGIC_MODIFY
#include <linux/amlogic/pwm-meson.h>

#define FOR_BACK_TRACE
//#define M_DEBUG
#ifdef M_DEBUG
#define DEBUG
#define PWM_DBG(fmt, ...) pr_info("%s ," fmt, "[MESON PWM]", ##__VA_ARGS__)
#else
#define PWM_DBG(fmt, ...)
#endif /*endif M_DEBUG*/

#else
#define REG_PWM_A		0x0
#define REG_PWM_B		0x4

#define PWM_LOW_MASK		GENMASK(15, 0)
#define PWM_HIGH_MASK		GENMASK(31, 16)

#define REG_MISC_AB		0x8
#define MISC_B_CLK_EN		BIT(23)
#define MISC_A_CLK_EN		BIT(15)
#define MISC_CLK_DIV_MASK	0x7f
#define MISC_B_CLK_DIV_SHIFT	16
#define MISC_A_CLK_DIV_SHIFT	8
#define MISC_B_CLK_SEL_SHIFT	6
#define MISC_A_CLK_SEL_SHIFT	4
#define MISC_CLK_SEL_MASK	0x3
#define MISC_B_EN		BIT(1)
#define MISC_A_EN		BIT(0)

#define MESON_NUM_PWMS		2

struct meson_pwm_channel {
	unsigned int hi;
	unsigned int lo;
	u8 pre_div;

	struct clk *clk_parent;
	struct clk_mux mux;
	struct clk *clk;
};

struct meson_pwm_data {
	const char * const *parent_names;
	unsigned int num_parents;
};

struct meson_pwm {
	struct pwm_chip chip;
	const struct meson_pwm_data *data;
	struct meson_pwm_channel channels[MESON_NUM_PWMS];
	void __iomem *base;
	/*
	 * Protects register (write) access to the REG_MISC_AB register
	 * that is shared between the two PWMs.
	 */
	spinlock_t lock;
};
#endif /*endif CONFIG_AMLOGIC_MODIFY*/

#ifdef CONFIG_AMLOGIC_MODIFY
struct meson_channel_ext_clk_data {
	u8		ext_clk_div_shift;
	u32		ext_clk_en_mask;
};

#define MESON_NEW_EVEN_EXT_CLK_DATA          0
#define MESON_NEW_ODD_EXT_CLK_DATA           1
/*need add external clk*/
static struct meson_channel_ext_clk_data channel_ext_clk_data[] = {
	{
		.ext_clk_div_shift	= EXT_CLK_A_DIV_SHIFT,
		.ext_clk_en_mask	= EXT_CLK_A_EN,
	},
	{
		.ext_clk_div_shift	= EXT_CLK_B_DIV_SHIFT,
		.ext_clk_en_mask	= EXT_CLK_B_EN,
	}
};

struct meson_pwm_channel_data {
	u8		reg_offset;
	u8		clk_sel_shift;
	u8		clk_div_shift;
	u32		clk_en_mask;
	u32		pwm_en_mask;
};

static struct meson_pwm_channel_data
	meson_pwm_per_channel_data[MESON_DOUBLE_NUM_PWMS] = {/*need add external clk*/
	{
		.reg_offset	= REG_PWM_A,
		.clk_sel_shift	= MISC_A_CLK_SEL_SHIFT,
		.clk_div_shift	= MISC_A_CLK_DIV_SHIFT,
		.clk_en_mask	= MISC_A_CLK_EN,
		.pwm_en_mask	= MISC_A_EN,
	},
	{
		.reg_offset	= REG_PWM_B,
		.clk_sel_shift	= MISC_B_CLK_SEL_SHIFT,
		.clk_div_shift	= MISC_B_CLK_DIV_SHIFT,
		.clk_en_mask	= MISC_B_CLK_EN,
		.pwm_en_mask	= MISC_B_EN,
	},
	{
		.reg_offset	= REG_PWM_A2,
		.clk_sel_shift	= MISC_A_CLK_SEL_SHIFT,
		.clk_div_shift	= MISC_A_CLK_DIV_SHIFT,
		.clk_en_mask	= MISC_A_CLK_EN,
		.pwm_en_mask	= MISC_A2_EN,
	},
	{
		.reg_offset	= REG_PWM_B2,
		.clk_sel_shift	= MISC_B_CLK_SEL_SHIFT,
		.clk_div_shift	= MISC_B_CLK_DIV_SHIFT,
		.clk_en_mask	= MISC_B_CLK_EN,
		.pwm_en_mask	= MISC_B2_EN,
	},
};
#else
static struct meson_pwm_channel_data {
	u8		reg_offset;
	u8		clk_sel_shift;
	u8		clk_div_shift;
	u32		clk_en_mask;
	u32		pwm_en_mask;
} meson_pwm_per_channel_data[] = {
	{	.reg_offset	= REG_PWM_A,
		.clk_sel_shift	= MISC_A_CLK_SEL_SHIFT,
		.clk_div_shift	= MISC_A_CLK_DIV_SHIFT,
		.clk_en_mask	= MISC_A_CLK_EN,
		.pwm_en_mask	= MISC_A_EN,
	},
	{
		.reg_offset	= REG_PWM_B,
		.clk_sel_shift	= MISC_B_CLK_SEL_SHIFT,
		.clk_div_shift	= MISC_B_CLK_DIV_SHIFT,
		.clk_en_mask	= MISC_B_CLK_EN,
		.pwm_en_mask	= MISC_B_EN,
	},
};
#endif //CONFIG_AMLOGIC_MODIFY

#define NORMAL_RW_NODE		0

#ifdef CONFIG_AMLOGIC_MODIFY
struct meson_pwm *to_meson_pwm(struct pwm_chip *chip)
#else
static inline struct meson_pwm *to_meson_pwm(struct pwm_chip *chip)
#endif
{
	return pwmchip_get_drvdata(chip);
}
EXPORT_SYMBOL(to_meson_pwm);

static int meson_pwm_request(struct pwm_chip *chip, struct pwm_device *pwm)
{
	struct meson_pwm *meson = to_meson_pwm(chip);
	struct meson_pwm_channel *channel;
	struct device *dev = &chip->dev;
	int err;

	channel = &meson->channels[pwm->hwpwm];
#ifdef CONFIG_AMLOGIC_MODIFY
	if (meson->data->channel_separated &&
		(pwm->hwpwm != MESON_PWM_0 && pwm->hwpwm != MESON_PWM_2)) {
		dev_err(dev, "Only MESON_PWM_0 and MESON_PWM_2 could be used on separated pwm chip\n");
		return -EINVAL;
	}
#endif

#ifdef CONFIG_AMLOGIC_MODIFY
	if (!meson->data->extern_clk)
#endif
		if (channel->clk_parent) {
			err = clk_set_parent(channel->clk, channel->clk_parent);
			if (err < 0) {
				dev_err(dev, "failed to set parent %s for %s: %d\n",
					__clk_get_name(channel->clk_parent),
					__clk_get_name(channel->clk), err);
					return err;
			}
		}

#ifdef CONFIG_AMLOGIC_MODIFY
	if (meson->data->extern_clk) {
		return 0;
	}
#endif

	err = clk_prepare_enable(channel->clk);
	if (err < 0) {
		dev_err(dev, "failed to enable clock %s: %d\n",
			__clk_get_name(channel->clk), err);
		return err;
	}

#ifdef CONFIG_AMLOGIC_MODIFY
	channel->clk_rate = clk_get_rate(channel->clk);
#endif

	return 0;
}

static void meson_pwm_free(struct pwm_chip *chip, struct pwm_device *pwm)
{
	struct meson_pwm *meson = to_meson_pwm(chip);
	struct meson_pwm_channel *channel = &meson->channels[pwm->hwpwm];

	if (meson->data->extern_clk)
		return;
	if (channel)
		clk_disable_unprepare(channel->clk);

}

static int meson_pwm_calc(struct meson_pwm *meson, struct pwm_device *pwm,
			  const struct pwm_state *state)
{
	struct meson_pwm_channel *channel = &meson->channels[pwm->hwpwm];
	unsigned int duty, period, pre_div, cnt, duty_cnt;
	unsigned long fin_freq = -1;

	duty = state->duty_cycle;
	period = state->period;

	if (state->polarity == PWM_POLARITY_INVERSED)
		duty = period - duty;

#ifdef CONFIG_AMLOGIC_MODIFY
	fin_freq = channel->clk_rate;
#else
	/*clk_get_rate()not use in Interrupt context*/
	fin_freq = clk_get_rate(channel->clk);
#endif

	if (fin_freq == 0) {
		dev_err(&meson->chip->dev, "invalid source clock frequency\n");
		return -EINVAL;
	}

	dev_dbg(&meson->chip->dev, "fin_freq: %lu Hz\n", fin_freq);

	pre_div = DIV64_U64_ROUND_CLOSEST((u64)fin_freq * (u64)period,
				(u64)NSEC_PER_SEC * 0xffffLL);
	if (pre_div > MISC_CLK_DIV_MASK) {
		dev_err(&meson->chip->dev, "unable to get period pre_div\n");
		return -EINVAL;
	}

	cnt = DIV64_U64_ROUND_CLOSEST((u64)fin_freq * (u64)period,
				(u64)NSEC_PER_SEC * (u64)(pre_div + 1));
	if (cnt > 0xffff) {
		dev_err(&meson->chip->dev, "unable to get period cnt\n");
		return -EINVAL;
	}

	dev_dbg(&meson->chip->dev, "period=%u pre_div=%u cnt=%u\n", period,
		pre_div, cnt);

	if (duty == period) {
		channel->pre_div = pre_div;
		channel->hi = cnt;
		channel->lo = 0;
	} else if (duty == 0) {
		channel->pre_div = pre_div;
		channel->hi = 0;
		channel->lo = cnt;
	} else {
		/* Then check is we can have the duty with the same pre_div */
		duty_cnt = DIV64_U64_ROUND_CLOSEST(fin_freq * (u64)duty,
				     NSEC_PER_SEC * (pre_div + 1));
		if (duty_cnt > 0xffff) {
			dev_err(&meson->chip->dev, "unable to get duty cycle\n");
			return -EINVAL;
		}

		dev_dbg(&meson->chip->dev, "duty=%u pre_div=%u duty_cnt=%u\n",
			duty, pre_div, duty_cnt);

		channel->pre_div = pre_div;
#ifndef CONFIG_AMLOGIC_MODIFY
		channel->hi = duty_cnt;
		channel->lo = cnt - duty_cnt;
#else
		if (duty_cnt == 0)
			duty_cnt++;

		channel->hi = duty_cnt - 1;
		channel->lo = cnt - duty_cnt - 1;
#endif
	}

#ifdef CONFIG_AMLOGIC_MODIFY
	/*
	 * duty_cycle equal 0% and 100%,constant should be enabled,
	 * high and low count will not incease one;
	 * otherwise, high and low count increase one.
	 */
	if (duty == period || duty == 0)
		pwm_constant_enable(meson, pwm->hwpwm);
	else
		pwm_constant_disable(meson, pwm->hwpwm);
#endif

	return 0;
}

static void meson_pwm_enable(struct meson_pwm *meson, struct pwm_device *pwm)
{
	struct meson_pwm_channel *channel = &meson->channels[pwm->hwpwm];
	struct meson_pwm_channel_data *channel_data;
	struct meson_channel_ext_clk_data *ext_clk_data;
	unsigned long flags;
	u32 value;

	channel_data = &meson_pwm_per_channel_data[pwm->hwpwm];

	spin_lock_irqsave(&meson->lock, flags);

	/*following filed are invalid on new soc*/
	value = readl(meson->base + REG_MISC_AB);
	value &= ~(MISC_CLK_DIV_MASK << channel_data->clk_div_shift);
	value |= channel->pre_div << channel_data->clk_div_shift;
	value |= channel_data->clk_en_mask;
	writel(value, meson->base + REG_MISC_AB);
	/*upper filed are invalid on new soc*/

	value = FIELD_PREP(PWM_HIGH_MASK, channel->hi) |
		FIELD_PREP(PWM_LOW_MASK, channel->lo);
	writel(value, meson->base + channel_data->reg_offset);

	value = readl(meson->base + REG_MISC_AB);
	value |= channel_data->pwm_en_mask;
	writel(value, meson->base + REG_MISC_AB);
#ifdef CONFIG_AMLOGIC_MODIFY
	PWM_DBG("%s,set pwm hi 0x%x, lo 0x%x\n", __func__, channel->hi, channel->lo);
	if (meson->data->extern_clk) {
		if (meson->data->channel_separated) {
			if (meson->data->even_channel)
				ext_clk_data = &channel_ext_clk_data[MESON_NEW_EVEN_EXT_CLK_DATA];
			else
				ext_clk_data = &channel_ext_clk_data[MESON_NEW_ODD_EXT_CLK_DATA];
		} else {
			ext_clk_data = &channel_ext_clk_data[pwm->hwpwm % MESON_NUM_PWMS];
		}
		value = readl(meson->ext_clk_base);
		value &= ~(EXT_CLK_DIV_MASK << ext_clk_data->ext_clk_div_shift);
		value |= channel->pre_div << ext_clk_data->ext_clk_div_shift;
		value |= ext_clk_data->ext_clk_en_mask;
		writel(value, meson->ext_clk_base);
		channel->clk_div = channel->pre_div;
	}
#endif
	spin_unlock_irqrestore(&meson->lock, flags);
}

static void meson_pwm_disable(struct meson_pwm *meson, struct pwm_device *pwm)
{
	unsigned long flags;
	u32 value;

	spin_lock_irqsave(&meson->lock, flags);

	value = readl(meson->base + REG_MISC_AB);
	value &= ~meson_pwm_per_channel_data[pwm->hwpwm].pwm_en_mask;
	writel(value, meson->base + REG_MISC_AB);

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

static int meson_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm,
			   const struct pwm_state *state)
{
	struct meson_pwm *meson = to_meson_pwm(chip);
	struct meson_pwm_channel *channel = &meson->channels[pwm->hwpwm];
	int err = 0;

	if (!state)
		return -EINVAL;

	if (!state->enabled) {
		if (state->polarity == PWM_POLARITY_INVERSED) {
			/*
			 * This IP block revision doesn't have an "always high"
			 * setting which we can use for "inverted disabled".
			 * Instead we achieve this using the same settings
			 * that we use a pre_div of 0 (to get the shortest
			 * possible duration for one "count") and
			 * "period == duty_cycle". This results in a signal
			 * which is LOW for one "count", while being HIGH for
			 * the rest of the (so the signal is HIGH for slightly
			 * less than 100% of the period, but this is the best
			 * we can achieve).
			 */
			channel->pre_div = 0;
			channel->hi = ~0;
			channel->lo = 0;

			meson_pwm_enable(meson, pwm);
		} else {
			meson_pwm_disable(meson, pwm);
		}
	} else {
		err = meson_pwm_calc(meson, pwm, state);
		if (err < 0)
			return err;
#ifdef CONFIG_AMLOGIC_MODIFY
		PWM_DBG("%s, calc pwm state period: %llu ns, duty: %llu ns\n",
						__func__, state->period, state->duty_cycle);
#endif
		meson_pwm_enable(meson, pwm);
	}

	return 0;
}

static unsigned int meson_pwm_cnt_to_ns(struct pwm_chip *chip,
					struct pwm_device *pwm, u32 cnt)
{
	struct meson_pwm *meson = to_meson_pwm(chip);
	struct meson_pwm_channel *channel;
	unsigned long fin_freq;
	u32 fin_ns;
#ifdef CONFIG_AMLOGIC_MODIFY
	unsigned long div_fin_freq;

	/* to_meson_pwm() can only be used after .get_state() is called */
	channel = &meson->channels[pwm->hwpwm];
	if (meson->data->extern_clk)
		fin_freq = channel->clk_rate;
	else
		fin_freq = clk_get_rate(channel->clk);
	div_fin_freq = DIV_ROUND_CLOSEST_ULL(fin_freq, channel->pre_div + 1);
	fin_ns = DIV_ROUND_CLOSEST_ULL(NSEC_PER_SEC, div_fin_freq);
	PWM_DBG("%s,the final clk rate:%uns pr_div:%d", __func__, fin_ns, channel->pre_div + 1);

	return cnt * fin_ns;
#else
	/* to_meson_pwm() can only be used after .get_state() is called */
	channel = &meson->channels[pwm->hwpwm];
	fin_freq = clk_get_rate(channel->clk);
	if (fin_freq == 0)
		return 0;

	fin_ns = DIV_ROUND_CLOSEST_ULL(NSEC_PER_SEC, fin_freq);

	return cnt * fin_ns * (channel->pre_div + 1);
#endif
}

#ifdef CONFIG_AMLOGIC_MODIFY
static void meson_v2_pwm_get_state(struct pwm_chip *chip, struct pwm_device *pwm,
				   struct pwm_state *state)
{
	struct meson_pwm *meson = to_meson_pwm(chip);
	struct meson_pwm_channel *channel;
	struct meson_pwm_channel_data *channel_data;
	u32 value, tmp_value, en_mask, constant_mask;
	bool constant_enabled;
	struct meson_channel_ext_clk_data *ext_clk_data;

	channel = &meson->channels[pwm->hwpwm];
	channel_data = &meson_pwm_per_channel_data[pwm->hwpwm];
	if (!state)
		return;

	switch (pwm->hwpwm) {
	case 0:
		en_mask = MISC_A_EN;
		constant_mask = MISC_A_CONSTANT;
		break;

	case 1:
		if (meson->data->channel_separated)
			return;// after s7, only channel 0 and 2 used.
		en_mask = MISC_B_EN;
		constant_mask = MISC_B_CONSTANT;
		break;

	case 2:
		en_mask = MISC_A2_EN;
		constant_mask = MISC_A_CONSTANT;
		break;

	case 3:
		if (meson->data->channel_separated)
			return;// after s7, only channel 0 and 2 used.
		en_mask = MISC_B2_EN;
		constant_mask = MISC_B_CONSTANT;
		break;
	default:
		return;
	}
	value = readl(meson->base + REG_MISC_AB);
	tmp_value = value;
	state->enabled = (value & en_mask) != 0;
	constant_enabled = (value & constant_mask) != 0;
#ifdef FOR_BACK_TRACE
	value = readl(meson->base + channel_data->reg_offset);
	channel->lo = FIELD_GET(PWM_LOW_MASK, value);
	channel->hi = FIELD_GET(PWM_HIGH_MASK, value);
	PWM_DBG("%s, get pwm state hi 0x%x, li 0x%x\n", __func__, channel->hi, channel->lo);
	if (meson->data->extern_clk) {
		if (meson->data->channel_separated) {
			if (meson->data->even_channel)
				ext_clk_data = &channel_ext_clk_data[MESON_NEW_EVEN_EXT_CLK_DATA];
			else
				ext_clk_data = &channel_ext_clk_data[MESON_NEW_ODD_EXT_CLK_DATA];
		} else {
			ext_clk_data = &channel_ext_clk_data[pwm->hwpwm % MESON_NUM_PWMS];
		}
		value = readl(meson->ext_clk_base);
		tmp_value = value >> ext_clk_data->ext_clk_div_shift;
		channel->pre_div = FIELD_GET(EXT_CLK_DIV_MASK, tmp_value);
	}
	if (channel->lo == 0) {
		if (constant_enabled) {
			state->period = meson_pwm_cnt_to_ns(chip, pwm, channel->hi);
			state->duty_cycle = state->period;
		} else {
			state->period = meson_pwm_cnt_to_ns(chip, pwm, channel->hi + 2);
			state->duty_cycle = meson_pwm_cnt_to_ns(chip, pwm, channel->hi + 1);
		}
	} else if (channel->hi == 0) {
		if (constant_enabled) {
			state->period = meson_pwm_cnt_to_ns(chip, pwm, channel->lo);
			state->duty_cycle = 0;
		} else {
			state->period = meson_pwm_cnt_to_ns(chip, pwm, channel->lo + 2);
			state->duty_cycle = meson_pwm_cnt_to_ns(chip, pwm, channel->hi + 1);
		}
	} else {
		state->period = meson_pwm_cnt_to_ns(chip, pwm,
						    channel->lo + channel->hi + 2);
		state->duty_cycle = meson_pwm_cnt_to_ns(chip, pwm,
							channel->hi + 1);
	}
	PWM_DBG("%s, get pwm state period: %llu ns, duty: %llu ns\n",
					__func__, state->period, state->duty_cycle);
#endif /*FOR_BACK_TRACE*/
}
#endif

static int meson_pwm_get_state(struct pwm_chip *chip,
						 struct pwm_device *pwm,
						 struct pwm_state *state)
{
	struct meson_pwm *meson = to_meson_pwm(chip);
	struct meson_pwm_channel_data *channel_data;
	struct meson_pwm_channel *channel;
	u32 value, tmp;
#ifdef CONFIG_AMLOGIC_MODIFY
	bool constant_enabled;
	u32 constant_mask;
#endif

	if (!state)
		goto state_return;

#ifdef CONFIG_AMLOGIC_MODIFY
	if (meson->data->extern_clk) {
		meson_v2_pwm_get_state(chip, pwm, state);
		goto state_return;
	}
	switch (pwm->hwpwm) {
	case 0:
		constant_mask = MISC_A_CONSTANT;
		break;

	case 1:
		constant_mask = MISC_B_CONSTANT;
		break;

	case 2:
		constant_mask = MISC_A_CONSTANT;
		break;

	case 3:
		constant_mask = MISC_B_CONSTANT;
		goto state_return;

	default:
		goto state_return;
	}
#endif

	channel = &meson->channels[pwm->hwpwm];
	channel_data = &meson_pwm_per_channel_data[pwm->hwpwm];

	value = readl(meson->base + REG_MISC_AB);

	tmp = channel_data->pwm_en_mask | channel_data->clk_en_mask;
	state->enabled = (value & tmp) == tmp;
#ifdef CONFIG_AMLOGIC_MODIFY
	constant_enabled = (value & constant_mask) != 0;
#endif
	tmp = value >> channel_data->clk_div_shift;
	channel->pre_div = FIELD_GET(MISC_CLK_DIV_MASK, tmp);

	value = readl(meson->base + channel_data->reg_offset);

	channel->lo = FIELD_GET(PWM_LOW_MASK, value);
	channel->hi = FIELD_GET(PWM_HIGH_MASK, value);
#if defined(CONFIG_AMLOGIC_MODIFY) && defined(FOR_BACK_TRACE)
	PWM_DBG("%s, get pwm state hi 0x%x, li 0x%x\n", __func__, channel->hi, channel->lo);
	if (channel->lo == 0) {
		if (constant_enabled) {
			state->period = meson_pwm_cnt_to_ns(chip, pwm, channel->hi);
			state->duty_cycle = state->period;
		} else {
			state->period = meson_pwm_cnt_to_ns(chip, pwm, channel->hi + 2);
			state->duty_cycle = meson_pwm_cnt_to_ns(chip, pwm, channel->hi + 1);
		}
	} else if (channel->hi == 0) {
		if (constant_enabled) {
			state->period = meson_pwm_cnt_to_ns(chip, pwm, channel->lo);
			state->duty_cycle = 0;
		} else {
			state->period = meson_pwm_cnt_to_ns(chip, pwm, channel->lo + 2);
			state->duty_cycle = meson_pwm_cnt_to_ns(chip, pwm, channel->hi + 1);
		}
	} else {
		state->period = meson_pwm_cnt_to_ns(chip, pwm,
							channel->lo + channel->hi + 2);
		state->duty_cycle = meson_pwm_cnt_to_ns(chip, pwm,
							channel->hi + 1);
	}
	PWM_DBG("%s, get pwm state period: %lluns, duty: %lluns\n",
					__func__, state->period, state->duty_cycle);
#else
	if (channel->lo == 0) {
		state->period = meson_pwm_cnt_to_ns(chip, pwm, channel->hi);
		state->duty_cycle = state->period;
	} else if (channel->lo >= channel->hi) {
		state->period = meson_pwm_cnt_to_ns(chip, pwm,
						    channel->lo + channel->hi);
		state->duty_cycle = meson_pwm_cnt_to_ns(chip, pwm,
							channel->hi);
	} else {
		state->period = 0;
		state->duty_cycle = 0;
	}
#endif

state_return:
	return 0;
}

static const struct pwm_ops meson_pwm_ops = {
	.request = meson_pwm_request,
	.free = meson_pwm_free,
	.apply = meson_pwm_apply,
	.get_state = meson_pwm_get_state,
};

#ifndef CONFIG_AMLOGIC_REMOVE_OLD
static char *pwm_meson8b_parent_names[] __refdata = {
	"xtal", "vid_pll", "fclk_div4", "fclk_div3"
};

static struct meson_pwm_data pwm_meson8b_data __refdata = {
	.parent_names = pwm_meson8b_parent_names,
	.num_parents = ARRAY_SIZE(pwm_meson8b_parent_names),
#ifdef CONFIG_AMLOGIC_MODIFY
	.double_channel = false,
#endif
};

static char *pwm_gxbb_parent_names[] __refdata = {
	"xtal", "hdmi_pll", "fclk_div4", "fclk_div3"
};

static struct meson_pwm_data pwm_gxbb_data __refdata = {
	.parent_names = pwm_gxbb_parent_names,
	.num_parents = ARRAY_SIZE(pwm_gxbb_parent_names),
#ifdef CONFIG_AMLOGIC_MODIFY
	.double_channel = false,
#endif
};

/*
 * Only the 2 first inputs of the GXBB AO PWMs are valid
 * The last 2 are grounded
 */
static char *pwm_gxbb_ao_parent_names[] __refdata = {
	"xtal", "clk81"
};

static struct meson_pwm_data pwm_gxbb_ao_data __refdata = {
	.parent_names = pwm_gxbb_ao_parent_names,
	.num_parents = ARRAY_SIZE(pwm_gxbb_ao_parent_names),
#ifdef CONFIG_AMLOGIC_MODIFY
	.double_channel = false,
#endif
};

static char *pwm_axg_ee_parent_names[] __refdata = {
	"xtal", "fclk_div5", "fclk_div4", "fclk_div3"
};

static struct meson_pwm_data pwm_axg_ee_data __refdata = {
	.parent_names = pwm_axg_ee_parent_names,
	.num_parents = ARRAY_SIZE(pwm_axg_ee_parent_names),
#ifdef CONFIG_AMLOGIC_MODIFY
	.double_channel = true,
#endif
};

static char *pwm_axg_ao_parent_names[] __refdata = {
	"xtal", "aoclk81", "fclk_div4", "fclk_div5"
};

static struct meson_pwm_data pwm_axg_ao_data __refdata = {
	.parent_names = pwm_axg_ao_parent_names,
	.num_parents = ARRAY_SIZE(pwm_axg_ao_parent_names),
#ifdef CONFIG_AMLOGIC_MODIFY
	.double_channel = true,
#endif
};
#endif

#ifndef CONFIG_AMLOGIC_ZAPPER_CUT
static char *pwm_g12a_ao_ab_parent_names[] __refdata = {
	"xtal", "aoclk81", "fclk_div4", "fclk_div5"
};

static struct meson_pwm_data pwm_g12a_ao_ab_data __refdata = {
	.parent_names = pwm_g12a_ao_ab_parent_names,
	.num_parents = ARRAY_SIZE(pwm_g12a_ao_ab_parent_names),
#ifdef CONFIG_AMLOGIC_MODIFY
	.double_channel = true,
#endif
};

static char *pwm_g12a_ao_cd_parent_names[] __refdata = {
	"xtal", "aoclk81",
};

static struct meson_pwm_data pwm_g12a_ao_cd_data __refdata = {
	.parent_names = pwm_g12a_ao_cd_parent_names,
	.num_parents = ARRAY_SIZE(pwm_g12a_ao_cd_parent_names),
#ifdef CONFIG_AMLOGIC_MODIFY
	.double_channel = true,
#endif
};

static char *pwm_g12a_ee_parent_names[] __refdata = {
	"xtal", "hdmi_pll", "fclk_div4", "fclk_div3"
};

static struct meson_pwm_data pwm_g12a_ee_data __refdata = {
	.parent_names = pwm_g12a_ee_parent_names,
	.num_parents = ARRAY_SIZE(pwm_g12a_ee_parent_names),
#ifdef CONFIG_AMLOGIC_MODIFY
	.double_channel = true,
#endif
};
#endif //end of CONFIG_AMLOGIC_ZAPPER_CUT

#ifdef CONFIG_AMLOGIC_MODIFY
#ifndef CONFIG_AMLOGIC_ZAPPER_CUT
static  char *pwm_t5d_parent_names[] __refdata = {
	"xtal", "clk81", "fclk_div4", "fclk_div5"
};

static struct meson_pwm_data pwm_t5d_data __refdata = {
	.parent_names = pwm_t5d_parent_names,
	.num_parents = ARRAY_SIZE(pwm_t5d_parent_names),
	.double_channel = true,
};
#endif //end of CONFIG_AMLOGIC_ZAPPER_CUT

static struct meson_pwm_data pwm_v2_data __refdata = {
	.double_channel = true,
	.extern_clk = true,
};

static struct meson_pwm_data pwm_odd_data __refdata = {
	.double_channel = true,
	.extern_clk = true,
	.channel_separated = true,
};

static struct meson_pwm_data pwm_even_data __refdata = {
	.double_channel = true,
	.extern_clk = true,
	.channel_separated = true,
	.even_channel = true,
};
#endif

static const struct of_device_id meson_pwm_matches[] = {
#ifndef CONFIG_AMLOGIC_REMOVE_OLD
	{
		.compatible = "amlogic,meson8b-pwm",
		.data = &pwm_meson8b_data
	},
	{
		.compatible = "amlogic,meson-gxbb-pwm",
		.data = &pwm_gxbb_data
	},
	{
		.compatible = "amlogic,meson-gxbb-ao-pwm",
		.data = &pwm_gxbb_ao_data
	},
	{
		.compatible = "amlogic,meson-axg-ee-pwm",
		.data = &pwm_axg_ee_data
	},
	{
		.compatible = "amlogic,meson-axg-ao-pwm",
		.data = &pwm_axg_ao_data
	},
#endif
#ifndef CONFIG_AMLOGIC_ZAPPER_CUT
	{
		.compatible = "amlogic,meson-g12a-ee-pwm",
		.data = &pwm_g12a_ee_data
	},
	{
		.compatible = "amlogic,meson-g12a-ao-pwm-ab",
		.data = &pwm_g12a_ao_ab_data
	},
	{
		.compatible = "amlogic,meson-g12a-ao-pwm-cd",
		.data = &pwm_g12a_ao_cd_data
	},
#endif
#ifdef CONFIG_AMLOGIC_MODIFY
#ifndef CONFIG_AMLOGIC_ZAPPER_CUT
	{
		.compatible = "amlogic,meson-tm2-ee-pwm",
		.data = &pwm_g12a_ee_data
	},
	{
		.compatible = "amlogic,meson-tm2-ao-pwm-ab",
		.data = &pwm_g12a_ao_ab_data
	},
	{
		.compatible = "amlogic,meson-tm2-ao-pwm-cd",
		.data = &pwm_g12a_ao_cd_data
	},
	{
		.compatible = "amlogic,meson-t5d-ee-pwm",
		.data = &pwm_t5d_data
	},
#endif //end of CONFIG_AMLOGIC_ZAPPER_CUT
	{
		.compatible = "amlogic,meson-v2-pwm",
		.data = &pwm_v2_data
	},
	{
		.compatible = "amlogic,meson-odd-pwm",
		.data = &pwm_odd_data
	},
	{
		.compatible = "amlogic,meson-even-pwm",
		.data = &pwm_even_data
	},
#endif
	{},
};
MODULE_DEVICE_TABLE(of, meson_pwm_matches);

static int meson_pwm_init_channels(struct meson_pwm *meson)
{
	struct device *dev = pwmchip_parent(meson->chip);
	struct clk_init_data init;
	unsigned int i;
	char name[255];
	int err;

	for (i = 0; i < meson->chip->npwm; i++) {
		struct meson_pwm_channel *channel = &meson->channels[i];

		snprintf(name, sizeof(name), "%s#mux%u", dev_name(dev), i);

		init.name = name;
		init.ops = &clk_mux_ops;
		init.flags = 0;
		init.parent_names = (const char *const *)meson->data->parent_names;
		init.num_parents = meson->data->num_parents;

		channel->mux.reg = meson->base + REG_MISC_AB;
		channel->mux.shift =
				meson_pwm_per_channel_data[i].clk_sel_shift;
		channel->mux.mask = MISC_CLK_SEL_MASK;
		channel->mux.flags = 0;
		channel->mux.lock = &meson->lock;
		channel->mux.table = NULL;
		channel->mux.hw.init = &init;

		channel->clk = devm_clk_register(dev, &channel->mux.hw);
		if (IS_ERR(channel->clk)) {
			err = PTR_ERR(channel->clk);
			dev_err(dev, "failed to register %s: %d\n", name, err);
			return err;
		}

		snprintf(name, sizeof(name), "clkin%u", i);

		channel->clk_parent = devm_clk_get_optional(dev, name);
		if (IS_ERR(channel->clk_parent))
			return PTR_ERR(channel->clk_parent);
	}

	return 0;
}

#ifdef CONFIG_AMLOGIC_MODIFY
static int meson_pwm_v2_init_channels(struct meson_pwm *meson)
{
	struct meson_pwm_channel *channels = meson->channels;
	struct device *dev = pwmchip_parent(meson->chip);
	struct device_node *np = dev->of_node;
	unsigned int i;

	for (i = 0; i < (meson->chip->npwm / 2); i++) {
		(channels + i)->clk = of_clk_get(np, i);
		if (IS_ERR((channels + i)->clk)) {
			dev_err(&meson->chip->dev, "can't get device clock\n");
			return PTR_ERR((channels + i)->clk);
		}
		(channels + i)->clk_rate = clk_get_rate((channels + i)->clk);
		PWM_DBG("get clock sel%d freq= %u\n", i, (channels + i)->clk_rate);
		(channels + i + 2)->clk = (channels + i)->clk;
		(channels + i + 2)->clk_rate = (channels + i)->clk_rate;
		if (meson->data->channel_separated)
			break;// after s7, only channel 0 and 2 used.
	}
	return 0;
}

static struct regmap_config meson_pwm_regmap_config = {
	.reg_bits = 32,
	.val_bits = 32,
	.reg_stride = 4,
};
#endif

#ifdef CONFIG_HIBERNATION
static int meson_pwm_freeze(struct device *dev)
{
	struct platform_device *pdev = to_platform_device(dev);
	struct meson_pwm *meson = platform_get_drvdata(pdev);
	int i;

	pinctrl_pm_select_sleep_state(dev);
	for (i = 0; i < PWM_REG_NUMS; i++) {
		if (i == PWM_REG_NUMS - 1 && meson->data->extern_clk)//read clock reg
			meson->regs_restore[i] = readl(meson->ext_clk_base);
		else
			meson->regs_restore[i] = readl(meson->base + 4 * i);
		pr_debug("pwm freeze, reg%d: 0x%x\n", i, meson->regs_restore[i]);
	}

	return 0;
}

static int meson_pwm_thaw(struct device *dev)
{
	return 0;
}

static int meson_pwm_restore(struct device *dev)
{
	struct platform_device *pdev = to_platform_device(dev);
	struct meson_pwm *meson = platform_get_drvdata(pdev);
	int i;

	pinctrl_pm_select_default_state(dev);
	for (i = 0; i < PWM_REG_NUMS; i++) {
		if (i == PWM_REG_NUMS - 1 && meson->data->extern_clk)// restore clock reg
			writel(meson->regs_restore[i], meson->ext_clk_base);
		else
			writel(meson->regs_restore[i], meson->base + 4 * i);
		pr_debug("pwm restore, reg%d: 0x%x\n", i, meson->regs_restore[i]);
	}

	return 0;
}

static int meson_pwm_pm_suspend(struct device *dev)
{
	return 0;
}

static int meson_pwm_pm_resume(struct device *dev)
{
	return 0;
}

const struct dev_pm_ops meson_pwm_pm = {
	.freeze		= meson_pwm_freeze,
	.thaw		= meson_pwm_thaw,
	.restore	= meson_pwm_restore,
	.suspend	= meson_pwm_pm_suspend,
	.resume		= meson_pwm_pm_resume,
};
#endif

static int meson_pwm_probe(struct platform_device *pdev)
{
	struct meson_pwm *meson;
	struct resource *regs;
	struct pwm_chip *chip;
	int err;
	int i;
#ifdef CONFIG_AMLOGIC_MODIFY
	struct resource *ext_clk_regs;
#endif
	struct meson_pwm_data *match =
			(struct meson_pwm_data *)of_device_get_match_data(&pdev->dev);

	if (match->double_channel) {
		chip = devm_pwmchip_alloc(&pdev->dev, MESON_DOUBLE_NUM_PWMS, sizeof(*meson));
		// chip->npwm = MESON_DOUBLE_NUM_PWMS;
	} else {
		chip = devm_pwmchip_alloc(&pdev->dev, MESON_NUM_PWMS, sizeof(*meson));
		// chip->npwm = MESON_DOUBLE_NUM_PWMS;
	}
	if (IS_ERR(chip))
		return PTR_ERR(chip);
	meson = to_meson_pwm(chip);
	meson->chip = chip;
	meson->data = devm_kzalloc(&pdev->dev, sizeof(*meson->data), GFP_KERNEL);
	if (!meson->data)
		return -ENOMEM;
	regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	meson->base = devm_ioremap_resource(&pdev->dev, regs);
	if (IS_ERR(meson->base))
		return PTR_ERR(meson->base);

#ifdef CONFIG_AMLOGIC_MODIFY
	meson_pwm_regmap_config.max_register = resource_size(regs) - 4;
	meson_pwm_regmap_config.name = devm_kasprintf(&pdev->dev,
						      GFP_KERNEL, "%s", "pwm");
	meson->regmap_base = devm_regmap_init_mmio(&pdev->dev,
						   meson->base,
						   &meson_pwm_regmap_config);
#endif
	spin_lock_init(&meson->lock);
	meson->chip->ops = &meson_pwm_ops;
	meson->chip->atomic = true;
	meson->data->num_parents = match->num_parents;
	meson->data->double_channel = match->double_channel;
#ifdef CONFIG_AMLOGIC_MODIFY
	meson->data->channel_separated = match->channel_separated;
	meson->data->even_channel = match->even_channel;
#endif
	meson->data->extern_clk = match->extern_clk;
	meson->data->parent_names = devm_kzalloc(&pdev->dev, sizeof(char *) * (match->num_parents),
			GFP_KERNEL);
	if (!meson->data)
		return -ENOMEM;
#ifdef CONFIG_AMLOGIC_MODIFY
	if (meson->data->extern_clk) {
		ext_clk_regs = platform_get_resource(pdev, IORESOURCE_MEM, 1);
		if (!ext_clk_regs) {
			dev_err(&pdev->dev, "can't get reg resource\n");
			return -ENODEV;
		}
		PWM_DBG("get clk reg start:0x%p end:0x%p\n", (void *)(ext_clk_regs->start),
			 (void *)(ext_clk_regs->end));
		meson->ext_clk_base = devm_ioremap(&pdev->dev, ext_clk_regs->start, 4);
		if (IS_ERR(meson->ext_clk_base))
			return PTR_ERR(meson->ext_clk_base);
	}
#endif
	for (i = 0; i < match->num_parents; i++)
		meson->data->parent_names[i] = devm_kstrdup(&pdev->dev, match->parent_names[i],
				GFP_KERNEL);

#ifdef CONFIG_AMLOGIC_MODIFY
	if (meson->data->extern_clk)
		err = meson_pwm_v2_init_channels(meson);
	else
#endif
		err = meson_pwm_init_channels(meson);
	if (err < 0)
		return err;

	err = pwmchip_add(meson->chip);
	if (err < 0) {
		dev_err(&pdev->dev, "failed to register PWM chip: %d\n", err);
		return err;
	}

	platform_set_drvdata(pdev, meson);
#ifdef CONFIG_AMLOGIC_MODIFY
	/*for constant,blinks functions*/
	if (meson->data->double_channel)
		meson_pwm_sysfs_init(&pdev->dev, NORMAL_RW_NODE);
#endif

	return 0;
}

static void meson_pwm_remove(struct platform_device *pdev)
{
	struct meson_pwm *meson = platform_get_drvdata(pdev);
#ifdef CONFIG_AMLOGIC_MODIFY
	if (meson->data->double_channel)
		meson_pwm_sysfs_exit(&pdev->dev);
#endif
	pwmchip_remove(meson->chip);
}

static struct platform_driver meson_pwm_driver = {
	.driver = {
		.name = "meson-pwm",
		.of_match_table = meson_pwm_matches,
#ifdef CONFIG_HIBERNATION
		.pm = &meson_pwm_pm,
#endif
	},
	.probe = meson_pwm_probe,
	.remove = meson_pwm_remove,
};

#ifdef CONFIG_AMLOGIC_MODIFY
int __init meson_pwm_init(void)
{
	const struct of_device_id *match_id;
	int ret;

	match_id = meson_pwm_matches;
	meson_pwm_driver.driver.of_match_table = match_id;
	ret = platform_driver_register(&meson_pwm_driver);
	return ret;
}

void __exit meson_pwm_exit(void)
{
	platform_driver_unregister(&meson_pwm_driver);
}

#else
module_platform_driver(meson_pwm_driver);
module_exit(meson_pwm_exit);

#endif
MODULE_DESCRIPTION("Amlogic Meson PWM Generator driver");
MODULE_AUTHOR("Neil Armstrong <[email protected]>");
MODULE_LICENSE("Dual BSD/GPL");