Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit 1ebb74cf authored by Boris Brezillon's avatar Boris Brezillon Committed by Thierry Reding
Browse files

pwm: rockchip: Add support for hardware readout 



Implement the ->get_state() function to expose initial state.

Signed-off-by: default avatarBoris Brezillon <boris.brezillon@free-electrons.com>
Reviewed-by: default avatarBrian Norris <briannorris@chromium.org>
Tested-by: default avatarBrian Norris <briannorris@chromium.org>
Tested-by: default avatarHeiko Stuebner <heiko@sntech.de>
Signed-off-by: default avatarThierry Reding <thierry.reding@gmail.com>
parent 12f9ce4a

drivers/pwm/pwm-rockchip.c

+67 −0
Original line number Original line Diff line number Diff line
@@ -51,6 +51,8 @@ struct rockchip_pwm_data { 




	void (*set_enable)(struct pwm_chip *chip,

	void (*set_enable)(struct pwm_chip *chip,

			   struct pwm_device *pwm, bool enable);

			   struct pwm_device *pwm, bool enable);

	void (*get_state)(struct pwm_chip *chip, struct pwm_device *pwm,

			  struct pwm_state *state);

};

};





static inline struct rockchip_pwm_chip *to_rockchip_pwm_chip(struct pwm_chip *c)

static inline struct rockchip_pwm_chip *to_rockchip_pwm_chip(struct pwm_chip *c)
@@ -75,6 +77,19 @@ static void rockchip_pwm_set_enable_v1(struct pwm_chip *chip, 
	writel_relaxed(val, pc->base + pc->data->regs.ctrl);

	writel_relaxed(val, pc->base + pc->data->regs.ctrl);

}

}





static void rockchip_pwm_get_state_v1(struct pwm_chip *chip,

				      struct pwm_device *pwm,

				      struct pwm_state *state)

{

	struct rockchip_pwm_chip *pc = to_rockchip_pwm_chip(chip);

	u32 enable_conf = PWM_CTRL_OUTPUT_EN | PWM_CTRL_TIMER_EN;

	u32 val;



	val = readl_relaxed(pc->base + pc->data->regs.ctrl);

	if ((val & enable_conf) == enable_conf)

		state->enabled = true;

}



static void rockchip_pwm_set_enable_v2(struct pwm_chip *chip,

static void rockchip_pwm_set_enable_v2(struct pwm_chip *chip,

				       struct pwm_device *pwm, bool enable)

				       struct pwm_device *pwm, bool enable)

{

{
@@ -98,6 +113,53 @@ static void rockchip_pwm_set_enable_v2(struct pwm_chip *chip, 
	writel_relaxed(val, pc->base + pc->data->regs.ctrl);

	writel_relaxed(val, pc->base + pc->data->regs.ctrl);

}

}





static void rockchip_pwm_get_state_v2(struct pwm_chip *chip,

				      struct pwm_device *pwm,

				      struct pwm_state *state)

{

	struct rockchip_pwm_chip *pc = to_rockchip_pwm_chip(chip);

	u32 enable_conf = PWM_OUTPUT_LEFT | PWM_LP_DISABLE | PWM_ENABLE |

			  PWM_CONTINUOUS;

	u32 val;



	val = readl_relaxed(pc->base + pc->data->regs.ctrl);

	if ((val & enable_conf) != enable_conf)

		return;



	state->enabled = true;



	if (!(val & PWM_DUTY_POSITIVE))

		state->polarity = PWM_POLARITY_INVERSED;

}



static void rockchip_pwm_get_state(struct pwm_chip *chip,

				   struct pwm_device *pwm,

				   struct pwm_state *state)

{

	struct rockchip_pwm_chip *pc = to_rockchip_pwm_chip(chip);

	unsigned long clk_rate;

	u64 tmp;

	int ret;



	ret = clk_enable(pc->clk);

	if (ret)

		return;



	clk_rate = clk_get_rate(pc->clk);



	tmp = readl_relaxed(pc->base + pc->data->regs.period);

	tmp *= pc->data->prescaler * NSEC_PER_SEC;

	state->period = DIV_ROUND_CLOSEST_ULL(tmp, clk_rate);



	tmp = readl_relaxed(pc->base + pc->data->regs.duty);

	tmp *= pc->data->prescaler * NSEC_PER_SEC;

	state->duty_cycle = DIV_ROUND_CLOSEST_ULL(tmp, clk_rate);



	pc->data->get_state(chip, pwm, state);



	clk_disable(pc->clk);

}



static int rockchip_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,

static int rockchip_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,

			       int duty_ns, int period_ns)

			       int duty_ns, int period_ns)

{

{
@@ -170,6 +232,7 @@ static void rockchip_pwm_disable(struct pwm_chip *chip, struct pwm_device *pwm) 
}

}





static const struct pwm_ops rockchip_pwm_ops_v1 = {

static const struct pwm_ops rockchip_pwm_ops_v1 = {

	.get_state = rockchip_pwm_get_state,

	.config = rockchip_pwm_config,

	.config = rockchip_pwm_config,

	.enable = rockchip_pwm_enable,

	.enable = rockchip_pwm_enable,

	.disable = rockchip_pwm_disable,

	.disable = rockchip_pwm_disable,
@@ -177,6 +240,7 @@ static const struct pwm_ops rockchip_pwm_ops_v1 = { 
};

};





static const struct pwm_ops rockchip_pwm_ops_v2 = {

static const struct pwm_ops rockchip_pwm_ops_v2 = {

	.get_state = rockchip_pwm_get_state,

	.config = rockchip_pwm_config,

	.config = rockchip_pwm_config,

	.set_polarity = rockchip_pwm_set_polarity,

	.set_polarity = rockchip_pwm_set_polarity,

	.enable = rockchip_pwm_enable,

	.enable = rockchip_pwm_enable,
@@ -194,6 +258,7 @@ static const struct rockchip_pwm_data pwm_data_v1 = { 
	.prescaler = 2,

	.prescaler = 2,

	.ops = &rockchip_pwm_ops_v1,

	.ops = &rockchip_pwm_ops_v1,

	.set_enable = rockchip_pwm_set_enable_v1,

	.set_enable = rockchip_pwm_set_enable_v1,

	.get_state = rockchip_pwm_get_state_v1,

};

};





static const struct rockchip_pwm_data pwm_data_v2 = {

static const struct rockchip_pwm_data pwm_data_v2 = {
@@ -206,6 +271,7 @@ static const struct rockchip_pwm_data pwm_data_v2 = { 
	.prescaler = 1,

	.prescaler = 1,

	.ops = &rockchip_pwm_ops_v2,

	.ops = &rockchip_pwm_ops_v2,

	.set_enable = rockchip_pwm_set_enable_v2,

	.set_enable = rockchip_pwm_set_enable_v2,

	.get_state = rockchip_pwm_get_state_v2,

};

};





static const struct rockchip_pwm_data pwm_data_vop = {

static const struct rockchip_pwm_data pwm_data_vop = {
@@ -218,6 +284,7 @@ static const struct rockchip_pwm_data pwm_data_vop = { 
	.prescaler = 1,

	.prescaler = 1,

	.ops = &rockchip_pwm_ops_v2,

	.ops = &rockchip_pwm_ops_v2,

	.set_enable = rockchip_pwm_set_enable_v2,

	.set_enable = rockchip_pwm_set_enable_v2,

	.get_state = rockchip_pwm_get_state_v2,

};

};





static const struct of_device_id rockchip_pwm_dt_ids[] = {

static const struct of_device_id rockchip_pwm_dt_ids[] = {