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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>
This commit is contained in:
Vincent Chen 2021-05-03 15:26:49 +08:00 committed by Leo Yu-Chi Liang
parent 81dadfa4bc
commit cc25f346c9
1 changed files with 11 additions and 10 deletions
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21
drivers/pwm/pwm-sifive.c
View File

@ -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;
}