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pwm: rockchip: Add support for hardware readout 

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

Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
Reviewed-by: Brian Norris <briannorris@chromium.org>
Tested-by: Brian Norris <briannorris@chromium.org>
Tested-by: Heiko Stuebner <heiko@sntech.de>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
This commit is contained in:
Boris Brezillon 2016-06-14 11:13:12 +02:00 committed by Thierry Reding
parent 12f9ce4a51
commit 1ebb74cf35
1 changed files with 67 additions and 0 deletions
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67
drivers/pwm/pwm-rockchip.c
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@ -51,6 +51,8 @@ struct rockchip_pwm_data {
void (*set_enable)(struct pwm_chip *chip,
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)
@ -75,6 +77,19 @@ static void rockchip_pwm_set_enable_v1(struct pwm_chip *chip,
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,
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);
}
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,
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 = {
.get_state = rockchip_pwm_get_state,
.config = rockchip_pwm_config,
.enable = rockchip_pwm_enable,
.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 = {
.get_state = rockchip_pwm_get_state,
.config = rockchip_pwm_config,
.set_polarity = rockchip_pwm_set_polarity,
.enable = rockchip_pwm_enable,
@ -194,6 +258,7 @@ static const struct rockchip_pwm_data pwm_data_v1 = {
.prescaler = 2,
.ops = &rockchip_pwm_ops_v1,
.set_enable = rockchip_pwm_set_enable_v1,
.get_state = rockchip_pwm_get_state_v1,
};
static const struct rockchip_pwm_data pwm_data_v2 = {
@ -206,6 +271,7 @@ static const struct rockchip_pwm_data pwm_data_v2 = {
.prescaler = 1,
.ops = &rockchip_pwm_ops_v2,
.set_enable = rockchip_pwm_set_enable_v2,
.get_state = rockchip_pwm_get_state_v2,
};
static const struct rockchip_pwm_data pwm_data_vop = {
@ -218,6 +284,7 @@ static const struct rockchip_pwm_data pwm_data_vop = {
.prescaler = 1,
.ops = &rockchip_pwm_ops_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[] = {