diff options
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/pwm/pwm-rockchip.c | 43 |
1 files changed, 41 insertions, 2 deletions
diff --git a/drivers/pwm/pwm-rockchip.c b/drivers/pwm/pwm-rockchip.c index a3fcb404036d..4d99d468df09 100644 --- a/drivers/pwm/pwm-rockchip.c +++ b/drivers/pwm/pwm-rockchip.c @@ -29,6 +29,7 @@ #define PWM_INACTIVE_POSITIVE (1 << 4) #define PWM_POLARITY_MASK (PWM_DUTY_POSITIVE | PWM_INACTIVE_POSITIVE) #define PWM_OUTPUT_LEFT (0 << 5) +#define PWM_LOCK_EN (1 << 6) #define PWM_LP_DISABLE (0 << 8) struct rockchip_pwm_chip { @@ -50,6 +51,7 @@ struct rockchip_pwm_data { struct rockchip_pwm_regs regs; unsigned int prescaler; bool supports_polarity; + bool supports_lock; u32 enable_conf; }; @@ -121,10 +123,19 @@ static void rockchip_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm, div = clk_rate * state->duty_cycle; duty = DIV_ROUND_CLOSEST_ULL(div, pc->data->prescaler * NSEC_PER_SEC); + /* + * Lock the period and duty of previous configuration, then + * change the duty and period, that would not be effective. + */ + ctrl = readl_relaxed(pc->base + pc->data->regs.ctrl); + if (pc->data->supports_lock) { + ctrl |= PWM_LOCK_EN; + writel_relaxed(ctrl, pc->base + pc->data->regs.ctrl); + } + writel(period, pc->base + pc->data->regs.period); writel(duty, pc->base + pc->data->regs.duty); - ctrl = readl_relaxed(pc->base + pc->data->regs.ctrl); if (pc->data->supports_polarity) { ctrl &= ~PWM_POLARITY_MASK; if (state->polarity == PWM_POLARITY_INVERSED) @@ -132,6 +143,15 @@ static void rockchip_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm, else ctrl |= PWM_DUTY_POSITIVE | PWM_INACTIVE_NEGATIVE; } + + /* + * Unlock and set polarity at the same time, + * the configuration of duty, period and polarity + * would be effective together at next period. + */ + if (pc->data->supports_lock) + ctrl &= ~PWM_LOCK_EN; + writel(ctrl, pc->base + pc->data->regs.ctrl); } @@ -180,7 +200,8 @@ static int rockchip_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm, pwm_get_state(pwm, &curstate); enabled = curstate.enabled; - if (state->polarity != curstate.polarity && enabled) { + if (state->polarity != curstate.polarity && enabled && + !pc->data->supports_lock) { ret = rockchip_pwm_enable(chip, pwm, false); if (ret) goto out; @@ -221,6 +242,7 @@ static const struct rockchip_pwm_data pwm_data_v1 = { }, .prescaler = 2, .supports_polarity = false, + .supports_lock = false, .enable_conf = PWM_CTRL_OUTPUT_EN | PWM_CTRL_TIMER_EN, }; @@ -233,6 +255,7 @@ static const struct rockchip_pwm_data pwm_data_v2 = { }, .prescaler = 1, .supports_polarity = true, + .supports_lock = false, .enable_conf = PWM_OUTPUT_LEFT | PWM_LP_DISABLE | PWM_ENABLE | PWM_CONTINUOUS, }; @@ -246,6 +269,21 @@ static const struct rockchip_pwm_data pwm_data_vop = { }, .prescaler = 1, .supports_polarity = true, + .supports_lock = false, + .enable_conf = PWM_OUTPUT_LEFT | PWM_LP_DISABLE | PWM_ENABLE | + PWM_CONTINUOUS, +}; + +static const struct rockchip_pwm_data pwm_data_v3 = { + .regs = { + .duty = 0x08, + .period = 0x04, + .cntr = 0x00, + .ctrl = 0x0c, + }, + .prescaler = 1, + .supports_polarity = true, + .supports_lock = true, .enable_conf = PWM_OUTPUT_LEFT | PWM_LP_DISABLE | PWM_ENABLE | PWM_CONTINUOUS, }; @@ -254,6 +292,7 @@ static const struct of_device_id rockchip_pwm_dt_ids[] = { { .compatible = "rockchip,rk2928-pwm", .data = &pwm_data_v1}, { .compatible = "rockchip,rk3288-pwm", .data = &pwm_data_v2}, { .compatible = "rockchip,vop-pwm", .data = &pwm_data_vop}, + { .compatible = "rockchip,rk3328-pwm", .data = &pwm_data_v3}, { /* sentinel */ } }; MODULE_DEVICE_TABLE(of, rockchip_pwm_dt_ids); |