diff options
| author | Vincent Chen <vincent.chen@sifive.com> | 2021-05-03 15:26:49 +0800 |
|---|---|---|
| committer | Leo Yu-Chi Liang <ycliang@andestech.com> | 2021-05-14 16:25:42 +0800 |
| commit | cc25f346c9e58f02efb68003d0526825fee265ea (patch) | |
| tree | cae415865902417272c19c408ce3095244bc0de3 /drivers/pwm | |
| parent | 81dadfa4bcf77c263edce444cc724e8784cbb683 (diff) | |
pwm: sifive: make set_config() and set_enable() work properly
The pwm_sifive_set_config() and pwm_sifive_set_enable() cannot work
properly due to the wrong implementations. It will cause the u-boot
PWM command to not work as expected. The bugs will be resolved in this
patch.
Signed-off-by: Vincent Chen <vincent.chen@sifive.com>
Reviewed-by: Rick Chen <rick@andestech.com>
Diffstat (limited to 'drivers/pwm')
| -rw-r--r-- | drivers/pwm/pwm-sifive.c | 21 |
1 files changed, 11 insertions, 10 deletions
diff --git a/drivers/pwm/pwm-sifive.c b/drivers/pwm/pwm-sifive.c index 01212d630a..b9813a3b6b 100644 --- a/drivers/pwm/pwm-sifive.c +++ b/drivers/pwm/pwm-sifive.c @@ -38,6 +38,9 @@ #define PWM_SIFIVE_SIZE_PWMCMP 4 #define PWM_SIFIVE_CMPWIDTH 16 +#define PWM_SIFIVE_CHANNEL_ENABLE_VAL 0 +#define PWM_SIFIVE_CHANNEL_DISABLE_VAL 0xffff + DECLARE_GLOBAL_DATA_PTR; struct pwm_sifive_regs { @@ -77,7 +80,7 @@ static int pwm_sifive_set_config(struct udevice *dev, uint channel, */ scale_pow = lldiv((uint64_t)priv->freq * period_ns, 1000000000); scale = clamp(ilog2(scale_pow) - PWM_SIFIVE_CMPWIDTH, 0, 0xf); - val |= FIELD_PREP(PWM_SIFIVE_PWMCFG_SCALE, scale); + val |= (FIELD_PREP(PWM_SIFIVE_PWMCFG_SCALE, scale) | PWM_SIFIVE_PWMCFG_EN_ALWAYS); /* * The problem of output producing mixed setting as mentioned at top, @@ -88,6 +91,7 @@ static int pwm_sifive_set_config(struct udevice *dev, uint channel, num = (u64)duty_ns * (1U << PWM_SIFIVE_CMPWIDTH); frac = DIV_ROUND_CLOSEST_ULL(num, period_ns); frac = min(frac, (1U << PWM_SIFIVE_CMPWIDTH) - 1); + frac = (1U << PWM_SIFIVE_CMPWIDTH) - 1 - frac; writel(val, priv->base + regs->cfg); writel(frac, priv->base + regs->cmp0 + channel * @@ -100,18 +104,15 @@ static int pwm_sifive_set_enable(struct udevice *dev, uint channel, bool enable) { struct pwm_sifive_priv *priv = dev_get_priv(dev); const struct pwm_sifive_regs *regs = &priv->data->regs; - u32 val; debug("%s: Enable '%s'\n", __func__, dev->name); - if (enable) { - val = readl(priv->base + regs->cfg); - val |= PWM_SIFIVE_PWMCFG_EN_ALWAYS; - writel(val, priv->base + regs->cfg); - } else { - writel(0, priv->base + regs->cmp0 + channel * - PWM_SIFIVE_SIZE_PWMCMP); - } + if (enable) + writel(PWM_SIFIVE_CHANNEL_ENABLE_VAL, priv->base + + regs->cmp0 + channel * PWM_SIFIVE_SIZE_PWMCMP); + else + writel(PWM_SIFIVE_CHANNEL_DISABLE_VAL, priv->base + + regs->cmp0 + channel * PWM_SIFIVE_SIZE_PWMCMP); return 0; } |