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path: root/drivers/pwm/pwm-samsung.c
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Diffstat (limited to 'drivers/pwm/pwm-samsung.c')
-rw-r--r--drivers/pwm/pwm-samsung.c152
1 files changed, 71 insertions, 81 deletions
diff --git a/drivers/pwm/pwm-samsung.c b/drivers/pwm/pwm-samsung.c
index e8828f57ab..69d9f4577b 100644
--- a/drivers/pwm/pwm-samsung.c
+++ b/drivers/pwm/pwm-samsung.c
@@ -77,6 +77,7 @@ struct samsung_pwm_channel {
* @base_clk: base clock used to drive the timers
* @tclk0: external clock 0 (can be ERR_PTR if not present)
* @tclk1: external clock 1 (can be ERR_PTR if not present)
+ * @channel: per channel driver data
*/
struct samsung_pwm_chip {
struct pwm_chip chip;
@@ -88,6 +89,7 @@ struct samsung_pwm_chip {
struct clk *base_clk;
struct clk *tclk0;
struct clk *tclk1;
+ struct samsung_pwm_channel channel[SAMSUNG_PWM_NUM];
};
#ifndef CONFIG_CLKSRC_SAMSUNG_PWM
@@ -117,21 +119,21 @@ static inline unsigned int to_tcon_channel(unsigned int channel)
return (channel == 0) ? 0 : (channel + 1);
}
-static void __pwm_samsung_manual_update(struct samsung_pwm_chip *chip,
+static void __pwm_samsung_manual_update(struct samsung_pwm_chip *our_chip,
struct pwm_device *pwm)
{
unsigned int tcon_chan = to_tcon_channel(pwm->hwpwm);
u32 tcon;
- tcon = readl(chip->base + REG_TCON);
+ tcon = readl(our_chip->base + REG_TCON);
tcon |= TCON_MANUALUPDATE(tcon_chan);
- writel(tcon, chip->base + REG_TCON);
+ writel(tcon, our_chip->base + REG_TCON);
tcon &= ~TCON_MANUALUPDATE(tcon_chan);
- writel(tcon, chip->base + REG_TCON);
+ writel(tcon, our_chip->base + REG_TCON);
}
-static void pwm_samsung_set_divisor(struct samsung_pwm_chip *pwm,
+static void pwm_samsung_set_divisor(struct samsung_pwm_chip *our_chip,
unsigned int channel, u8 divisor)
{
u8 shift = TCFG1_SHIFT(channel);
@@ -139,39 +141,39 @@ static void pwm_samsung_set_divisor(struct samsung_pwm_chip *pwm,
u32 reg;
u8 bits;
- bits = (fls(divisor) - 1) - pwm->variant.div_base;
+ bits = (fls(divisor) - 1) - our_chip->variant.div_base;
spin_lock_irqsave(&samsung_pwm_lock, flags);
- reg = readl(pwm->base + REG_TCFG1);
+ reg = readl(our_chip->base + REG_TCFG1);
reg &= ~(TCFG1_MUX_MASK << shift);
reg |= bits << shift;
- writel(reg, pwm->base + REG_TCFG1);
+ writel(reg, our_chip->base + REG_TCFG1);
spin_unlock_irqrestore(&samsung_pwm_lock, flags);
}
-static int pwm_samsung_is_tdiv(struct samsung_pwm_chip *chip, unsigned int chan)
+static int pwm_samsung_is_tdiv(struct samsung_pwm_chip *our_chip, unsigned int chan)
{
- struct samsung_pwm_variant *variant = &chip->variant;
+ struct samsung_pwm_variant *variant = &our_chip->variant;
u32 reg;
- reg = readl(chip->base + REG_TCFG1);
+ reg = readl(our_chip->base + REG_TCFG1);
reg >>= TCFG1_SHIFT(chan);
reg &= TCFG1_MUX_MASK;
return (BIT(reg) & variant->tclk_mask) == 0;
}
-static unsigned long pwm_samsung_get_tin_rate(struct samsung_pwm_chip *chip,
+static unsigned long pwm_samsung_get_tin_rate(struct samsung_pwm_chip *our_chip,
unsigned int chan)
{
unsigned long rate;
u32 reg;
- rate = clk_get_rate(chip->base_clk);
+ rate = clk_get_rate(our_chip->base_clk);
- reg = readl(chip->base + REG_TCFG0);
+ reg = readl(our_chip->base + REG_TCFG0);
if (chan >= 2)
reg >>= TCFG0_PRESCALER1_SHIFT;
reg &= TCFG0_PRESCALER_MASK;
@@ -179,28 +181,28 @@ static unsigned long pwm_samsung_get_tin_rate(struct samsung_pwm_chip *chip,
return rate / (reg + 1);
}
-static unsigned long pwm_samsung_calc_tin(struct samsung_pwm_chip *chip,
+static unsigned long pwm_samsung_calc_tin(struct samsung_pwm_chip *our_chip,
unsigned int chan, unsigned long freq)
{
- struct samsung_pwm_variant *variant = &chip->variant;
+ struct samsung_pwm_variant *variant = &our_chip->variant;
unsigned long rate;
struct clk *clk;
u8 div;
- if (!pwm_samsung_is_tdiv(chip, chan)) {
- clk = (chan < 2) ? chip->tclk0 : chip->tclk1;
+ if (!pwm_samsung_is_tdiv(our_chip, chan)) {
+ clk = (chan < 2) ? our_chip->tclk0 : our_chip->tclk1;
if (!IS_ERR(clk)) {
rate = clk_get_rate(clk);
if (rate)
return rate;
}
- dev_warn(chip->chip.dev,
+ dev_warn(our_chip->chip.dev,
"tclk of PWM %d is inoperational, using tdiv\n", chan);
}
- rate = pwm_samsung_get_tin_rate(chip, chan);
- dev_dbg(chip->chip.dev, "tin parent at %lu\n", rate);
+ rate = pwm_samsung_get_tin_rate(our_chip, chan);
+ dev_dbg(our_chip->chip.dev, "tin parent at %lu\n", rate);
/*
* Compare minimum PWM frequency that can be achieved with possible
@@ -220,7 +222,7 @@ static unsigned long pwm_samsung_calc_tin(struct samsung_pwm_chip *chip,
div = variant->div_base;
}
- pwm_samsung_set_divisor(chip, chan, BIT(div));
+ pwm_samsung_set_divisor(our_chip, chan, BIT(div));
return rate >> div;
}
@@ -228,7 +230,6 @@ static unsigned long pwm_samsung_calc_tin(struct samsung_pwm_chip *chip,
static int pwm_samsung_request(struct pwm_chip *chip, struct pwm_device *pwm)
{
struct samsung_pwm_chip *our_chip = to_samsung_pwm_chip(chip);
- struct samsung_pwm_channel *our_chan;
if (!(our_chip->variant.output_mask & BIT(pwm->hwpwm))) {
dev_warn(chip->dev,
@@ -237,20 +238,11 @@ static int pwm_samsung_request(struct pwm_chip *chip, struct pwm_device *pwm)
return -EINVAL;
}
- our_chan = kzalloc(sizeof(*our_chan), GFP_KERNEL);
- if (!our_chan)
- return -ENOMEM;
-
- pwm_set_chip_data(pwm, our_chan);
+ memset(&our_chip->channel[pwm->hwpwm], 0, sizeof(our_chip->channel[pwm->hwpwm]));
return 0;
}
-static void pwm_samsung_free(struct pwm_chip *chip, struct pwm_device *pwm)
-{
- kfree(pwm_get_chip_data(pwm));
-}
-
static int pwm_samsung_enable(struct pwm_chip *chip, struct pwm_device *pwm)
{
struct samsung_pwm_chip *our_chip = to_samsung_pwm_chip(chip);
@@ -302,14 +294,14 @@ static void pwm_samsung_disable(struct pwm_chip *chip, struct pwm_device *pwm)
spin_unlock_irqrestore(&samsung_pwm_lock, flags);
}
-static void pwm_samsung_manual_update(struct samsung_pwm_chip *chip,
+static void pwm_samsung_manual_update(struct samsung_pwm_chip *our_chip,
struct pwm_device *pwm)
{
unsigned long flags;
spin_lock_irqsave(&samsung_pwm_lock, flags);
- __pwm_samsung_manual_update(chip, pwm);
+ __pwm_samsung_manual_update(our_chip, pwm);
spin_unlock_irqrestore(&samsung_pwm_lock, flags);
}
@@ -318,7 +310,7 @@ static int __pwm_samsung_config(struct pwm_chip *chip, struct pwm_device *pwm,
int duty_ns, int period_ns, bool force_period)
{
struct samsung_pwm_chip *our_chip = to_samsung_pwm_chip(chip);
- struct samsung_pwm_channel *chan = pwm_get_chip_data(pwm);
+ struct samsung_pwm_channel *chan = &our_chip->channel[pwm->hwpwm];
u32 tin_ns = chan->tin_ns, tcnt, tcmp, oldtcmp;
tcnt = readl(our_chip->base + REG_TCNTB(pwm->hwpwm));
@@ -393,7 +385,7 @@ static int pwm_samsung_config(struct pwm_chip *chip, struct pwm_device *pwm,
return __pwm_samsung_config(chip, pwm, duty_ns, period_ns, false);
}
-static void pwm_samsung_set_invert(struct samsung_pwm_chip *chip,
+static void pwm_samsung_set_invert(struct samsung_pwm_chip *our_chip,
unsigned int channel, bool invert)
{
unsigned int tcon_chan = to_tcon_channel(channel);
@@ -402,17 +394,17 @@ static void pwm_samsung_set_invert(struct samsung_pwm_chip *chip,
spin_lock_irqsave(&samsung_pwm_lock, flags);
- tcon = readl(chip->base + REG_TCON);
+ tcon = readl(our_chip->base + REG_TCON);
if (invert) {
- chip->inverter_mask |= BIT(channel);
+ our_chip->inverter_mask |= BIT(channel);
tcon |= TCON_INVERT(tcon_chan);
} else {
- chip->inverter_mask &= ~BIT(channel);
+ our_chip->inverter_mask &= ~BIT(channel);
tcon &= ~TCON_INVERT(tcon_chan);
}
- writel(tcon, chip->base + REG_TCON);
+ writel(tcon, our_chip->base + REG_TCON);
spin_unlock_irqrestore(&samsung_pwm_lock, flags);
}
@@ -473,9 +465,7 @@ static int pwm_samsung_apply(struct pwm_chip *chip, struct pwm_device *pwm,
static const struct pwm_ops pwm_samsung_ops = {
.request = pwm_samsung_request,
- .free = pwm_samsung_free,
.apply = pwm_samsung_apply,
- .owner = THIS_MODULE,
};
#ifdef CONFIG_OF
@@ -517,9 +507,9 @@ static const struct of_device_id samsung_pwm_matches[] = {
};
MODULE_DEVICE_TABLE(of, samsung_pwm_matches);
-static int pwm_samsung_parse_dt(struct samsung_pwm_chip *chip)
+static int pwm_samsung_parse_dt(struct samsung_pwm_chip *our_chip)
{
- struct device_node *np = chip->chip.dev->of_node;
+ struct device_node *np = our_chip->chip.dev->of_node;
const struct of_device_id *match;
struct property *prop;
const __be32 *cur;
@@ -529,22 +519,22 @@ static int pwm_samsung_parse_dt(struct samsung_pwm_chip *chip)
if (!match)
return -ENODEV;
- memcpy(&chip->variant, match->data, sizeof(chip->variant));
+ memcpy(&our_chip->variant, match->data, sizeof(our_chip->variant));
of_property_for_each_u32(np, "samsung,pwm-outputs", prop, cur, val) {
if (val >= SAMSUNG_PWM_NUM) {
- dev_err(chip->chip.dev,
+ dev_err(our_chip->chip.dev,
"%s: invalid channel index in samsung,pwm-outputs property\n",
__func__);
continue;
}
- chip->variant.output_mask |= BIT(val);
+ our_chip->variant.output_mask |= BIT(val);
}
return 0;
}
#else
-static int pwm_samsung_parse_dt(struct samsung_pwm_chip *chip)
+static int pwm_samsung_parse_dt(struct samsung_pwm_chip *our_chip)
{
return -ENODEV;
}
@@ -553,21 +543,21 @@ static int pwm_samsung_parse_dt(struct samsung_pwm_chip *chip)
static int pwm_samsung_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
- struct samsung_pwm_chip *chip;
+ struct samsung_pwm_chip *our_chip;
unsigned int chan;
int ret;
- chip = devm_kzalloc(&pdev->dev, sizeof(*chip), GFP_KERNEL);
- if (chip == NULL)
+ our_chip = devm_kzalloc(&pdev->dev, sizeof(*our_chip), GFP_KERNEL);
+ if (our_chip == NULL)
return -ENOMEM;
- chip->chip.dev = &pdev->dev;
- chip->chip.ops = &pwm_samsung_ops;
- chip->chip.npwm = SAMSUNG_PWM_NUM;
- chip->inverter_mask = BIT(SAMSUNG_PWM_NUM) - 1;
+ our_chip->chip.dev = &pdev->dev;
+ our_chip->chip.ops = &pwm_samsung_ops;
+ our_chip->chip.npwm = SAMSUNG_PWM_NUM;
+ our_chip->inverter_mask = BIT(SAMSUNG_PWM_NUM) - 1;
if (IS_ENABLED(CONFIG_OF) && pdev->dev.of_node) {
- ret = pwm_samsung_parse_dt(chip);
+ ret = pwm_samsung_parse_dt(our_chip);
if (ret)
return ret;
} else {
@@ -576,58 +566,58 @@ static int pwm_samsung_probe(struct platform_device *pdev)
return -EINVAL;
}
- memcpy(&chip->variant, pdev->dev.platform_data,
- sizeof(chip->variant));
+ memcpy(&our_chip->variant, pdev->dev.platform_data,
+ sizeof(our_chip->variant));
}
- chip->base = devm_platform_ioremap_resource(pdev, 0);
- if (IS_ERR(chip->base))
- return PTR_ERR(chip->base);
+ our_chip->base = devm_platform_ioremap_resource(pdev, 0);
+ if (IS_ERR(our_chip->base))
+ return PTR_ERR(our_chip->base);
- chip->base_clk = devm_clk_get(&pdev->dev, "timers");
- if (IS_ERR(chip->base_clk)) {
+ our_chip->base_clk = devm_clk_get(&pdev->dev, "timers");
+ if (IS_ERR(our_chip->base_clk)) {
dev_err(dev, "failed to get timer base clk\n");
- return PTR_ERR(chip->base_clk);
+ return PTR_ERR(our_chip->base_clk);
}
- ret = clk_prepare_enable(chip->base_clk);
+ ret = clk_prepare_enable(our_chip->base_clk);
if (ret < 0) {
dev_err(dev, "failed to enable base clock\n");
return ret;
}
for (chan = 0; chan < SAMSUNG_PWM_NUM; ++chan)
- if (chip->variant.output_mask & BIT(chan))
- pwm_samsung_set_invert(chip, chan, true);
+ if (our_chip->variant.output_mask & BIT(chan))
+ pwm_samsung_set_invert(our_chip, chan, true);
/* Following clocks are optional. */
- chip->tclk0 = devm_clk_get(&pdev->dev, "pwm-tclk0");
- chip->tclk1 = devm_clk_get(&pdev->dev, "pwm-tclk1");
+ our_chip->tclk0 = devm_clk_get(&pdev->dev, "pwm-tclk0");
+ our_chip->tclk1 = devm_clk_get(&pdev->dev, "pwm-tclk1");
- platform_set_drvdata(pdev, chip);
+ platform_set_drvdata(pdev, our_chip);
- ret = pwmchip_add(&chip->chip);
+ ret = pwmchip_add(&our_chip->chip);
if (ret < 0) {
dev_err(dev, "failed to register PWM chip\n");
- clk_disable_unprepare(chip->base_clk);
+ clk_disable_unprepare(our_chip->base_clk);
return ret;
}
dev_dbg(dev, "base_clk at %lu, tclk0 at %lu, tclk1 at %lu\n",
- clk_get_rate(chip->base_clk),
- !IS_ERR(chip->tclk0) ? clk_get_rate(chip->tclk0) : 0,
- !IS_ERR(chip->tclk1) ? clk_get_rate(chip->tclk1) : 0);
+ clk_get_rate(our_chip->base_clk),
+ !IS_ERR(our_chip->tclk0) ? clk_get_rate(our_chip->tclk0) : 0,
+ !IS_ERR(our_chip->tclk1) ? clk_get_rate(our_chip->tclk1) : 0);
return 0;
}
static void pwm_samsung_remove(struct platform_device *pdev)
{
- struct samsung_pwm_chip *chip = platform_get_drvdata(pdev);
+ struct samsung_pwm_chip *our_chip = platform_get_drvdata(pdev);
- pwmchip_remove(&chip->chip);
+ pwmchip_remove(&our_chip->chip);
- clk_disable_unprepare(chip->base_clk);
+ clk_disable_unprepare(our_chip->base_clk);
}
#ifdef CONFIG_PM_SLEEP
@@ -639,9 +629,9 @@ static int pwm_samsung_resume(struct device *dev)
for (i = 0; i < SAMSUNG_PWM_NUM; i++) {
struct pwm_device *pwm = &chip->pwms[i];
- struct samsung_pwm_channel *chan = pwm_get_chip_data(pwm);
+ struct samsung_pwm_channel *chan = &our_chip->channel[i];
- if (!chan)
+ if (!test_bit(PWMF_REQUESTED, &pwm->flags))
continue;
if (our_chip->variant.output_mask & BIT(i))
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-16 01:22:06 +0000