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path: root/drivers/pwm/pwm-meson.c
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Diffstat (limited to 'drivers/pwm/pwm-meson.c')
-rw-r--r--drivers/pwm/pwm-meson.c51
1 files changed, 28 insertions, 23 deletions
diff --git a/drivers/pwm/pwm-meson.c b/drivers/pwm/pwm-meson.c
index 2971bbf3b5..52ac3277f4 100644
--- a/drivers/pwm/pwm-meson.c
+++ b/drivers/pwm/pwm-meson.c
@@ -122,7 +122,7 @@ static int meson_pwm_request(struct pwm_chip *chip, struct pwm_device *pwm)
{
struct meson_pwm *meson = to_meson_pwm(chip);
struct meson_pwm_channel *channel = &meson->channels[pwm->hwpwm];
- struct device *dev = chip->dev;
+ struct device *dev = pwmchip_parent(chip);
int err;
err = clk_prepare_enable(channel->clk);
@@ -143,12 +143,13 @@ static void meson_pwm_free(struct pwm_chip *chip, struct pwm_device *pwm)
clk_disable_unprepare(channel->clk);
}
-static int meson_pwm_calc(struct meson_pwm *meson, struct pwm_device *pwm,
+static int meson_pwm_calc(struct pwm_chip *chip, struct pwm_device *pwm,
const struct pwm_state *state)
{
+ struct meson_pwm *meson = to_meson_pwm(chip);
struct meson_pwm_channel *channel = &meson->channels[pwm->hwpwm];
unsigned int cnt, duty_cnt;
- unsigned long fin_freq;
+ long fin_freq;
u64 duty, period, freq;
duty = state->duty_cycle;
@@ -168,20 +169,21 @@ static int meson_pwm_calc(struct meson_pwm *meson, struct pwm_device *pwm,
freq = ULONG_MAX;
fin_freq = clk_round_rate(channel->clk, freq);
- if (fin_freq == 0) {
- dev_err(meson->chip.dev, "invalid source clock frequency\n");
- return -EINVAL;
+ if (fin_freq <= 0) {
+ dev_err(pwmchip_parent(chip),
+ "invalid source clock frequency %llu\n", freq);
+ return fin_freq ? fin_freq : -EINVAL;
}
- dev_dbg(meson->chip.dev, "fin_freq: %lu Hz\n", fin_freq);
+ dev_dbg(pwmchip_parent(chip), "fin_freq: %ld Hz\n", fin_freq);
- cnt = div_u64(fin_freq * period, NSEC_PER_SEC);
+ cnt = mul_u64_u64_div_u64(fin_freq, period, NSEC_PER_SEC);
if (cnt > 0xffff) {
- dev_err(meson->chip.dev, "unable to get period cnt\n");
+ dev_err(pwmchip_parent(chip), "unable to get period cnt\n");
return -EINVAL;
}
- dev_dbg(meson->chip.dev, "period=%llu cnt=%u\n", period, cnt);
+ dev_dbg(pwmchip_parent(chip), "period=%llu cnt=%u\n", period, cnt);
if (duty == period) {
channel->hi = cnt;
@@ -190,9 +192,9 @@ static int meson_pwm_calc(struct meson_pwm *meson, struct pwm_device *pwm,
channel->hi = 0;
channel->lo = cnt;
} else {
- duty_cnt = div_u64(fin_freq * duty, NSEC_PER_SEC);
+ duty_cnt = mul_u64_u64_div_u64(fin_freq, duty, NSEC_PER_SEC);
- dev_dbg(meson->chip.dev, "duty=%llu duty_cnt=%u\n", duty, duty_cnt);
+ dev_dbg(pwmchip_parent(chip), "duty=%llu duty_cnt=%u\n", duty, duty_cnt);
channel->hi = duty_cnt;
channel->lo = cnt - duty_cnt;
@@ -203,8 +205,9 @@ static int meson_pwm_calc(struct meson_pwm *meson, struct pwm_device *pwm,
return 0;
}
-static void meson_pwm_enable(struct meson_pwm *meson, struct pwm_device *pwm)
+static void meson_pwm_enable(struct pwm_chip *chip, struct pwm_device *pwm)
{
+ struct meson_pwm *meson = to_meson_pwm(chip);
struct meson_pwm_channel *channel = &meson->channels[pwm->hwpwm];
struct meson_pwm_channel_data *channel_data;
unsigned long flags;
@@ -215,7 +218,7 @@ static void meson_pwm_enable(struct meson_pwm *meson, struct pwm_device *pwm)
err = clk_set_rate(channel->clk, channel->rate);
if (err)
- dev_err(meson->chip.dev, "setting clock rate failed\n");
+ dev_err(pwmchip_parent(chip), "setting clock rate failed\n");
spin_lock_irqsave(&meson->lock, flags);
@@ -230,8 +233,9 @@ static void meson_pwm_enable(struct meson_pwm *meson, struct pwm_device *pwm)
spin_unlock_irqrestore(&meson->lock, flags);
}
-static void meson_pwm_disable(struct meson_pwm *meson, struct pwm_device *pwm)
+static void meson_pwm_disable(struct pwm_chip *chip, struct pwm_device *pwm)
{
+ struct meson_pwm *meson = to_meson_pwm(chip);
unsigned long flags;
u32 value;
@@ -269,16 +273,16 @@ static int meson_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm,
channel->hi = ~0;
channel->lo = 0;
- meson_pwm_enable(meson, pwm);
+ meson_pwm_enable(chip, pwm);
} else {
- meson_pwm_disable(meson, pwm);
+ meson_pwm_disable(chip, pwm);
}
} else {
- err = meson_pwm_calc(meson, pwm, state);
+ err = meson_pwm_calc(chip, pwm, state);
if (err < 0)
return err;
- meson_pwm_enable(meson, pwm);
+ meson_pwm_enable(chip, pwm);
}
return 0;
@@ -432,10 +436,11 @@ static const struct of_device_id meson_pwm_matches[] = {
};
MODULE_DEVICE_TABLE(of, meson_pwm_matches);
-static int meson_pwm_init_channels(struct meson_pwm *meson)
+static int meson_pwm_init_channels(struct pwm_chip *chip)
{
+ struct meson_pwm *meson = to_meson_pwm(chip);
struct clk_parent_data mux_parent_data[MESON_MAX_MUX_PARENTS] = {};
- struct device *dev = meson->chip.dev;
+ struct device *dev = pwmchip_parent(chip);
unsigned int i;
char name[255];
int err;
@@ -445,7 +450,7 @@ static int meson_pwm_init_channels(struct meson_pwm *meson)
mux_parent_data[i].name = meson->data->parent_names[i];
}
- for (i = 0; i < meson->chip.npwm; i++) {
+ for (i = 0; i < chip->npwm; i++) {
struct meson_pwm_channel *channel = &meson->channels[i];
struct clk_parent_data div_parent = {}, gate_parent = {};
struct clk_init_data init = {};
@@ -543,7 +548,7 @@ static int meson_pwm_probe(struct platform_device *pdev)
meson->data = of_device_get_match_data(&pdev->dev);
- err = meson_pwm_init_channels(meson);
+ err = meson_pwm_init_channels(&meson->chip);
if (err < 0)
return err;