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path: root/drivers/pwm/pwm-tiecap.c
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Diffstat (limited to 'drivers/pwm/pwm-tiecap.c')
-rw-r--r--drivers/pwm/pwm-tiecap.c90
1 files changed, 48 insertions, 42 deletions
diff --git a/drivers/pwm/pwm-tiecap.c b/drivers/pwm/pwm-tiecap.c
index 6ec342dd3eea..34b228626bd5 100644
--- a/drivers/pwm/pwm-tiecap.c
+++ b/drivers/pwm/pwm-tiecap.c
@@ -39,15 +39,15 @@
#define ECCTL2_TSCTR_FREERUN BIT(4)
struct ecap_context {
- u32 cap3;
- u32 cap4;
- u16 ecctl2;
+ u32 cap3;
+ u32 cap4;
+ u16 ecctl2;
};
struct ecap_pwm_chip {
- struct pwm_chip chip;
- unsigned int clk_rate;
- void __iomem *mmio_base;
+ struct pwm_chip chip;
+ unsigned int clk_rate;
+ void __iomem *mmio_base;
struct ecap_context ctx;
};
@@ -64,9 +64,9 @@ static int ecap_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
int duty_ns, int period_ns)
{
struct ecap_pwm_chip *pc = to_ecap_pwm_chip(chip);
+ u32 period_cycles, duty_cycles;
unsigned long long c;
- unsigned long period_cycles, duty_cycles;
- unsigned int reg_val;
+ u16 value;
if (period_ns > NSEC_PER_SEC)
return -ERANGE;
@@ -74,7 +74,7 @@ static int ecap_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
c = pc->clk_rate;
c = c * period_ns;
do_div(c, NSEC_PER_SEC);
- period_cycles = (unsigned long)c;
+ period_cycles = (u32)c;
if (period_cycles < 1) {
period_cycles = 1;
@@ -83,17 +83,17 @@ static int ecap_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
c = pc->clk_rate;
c = c * duty_ns;
do_div(c, NSEC_PER_SEC);
- duty_cycles = (unsigned long)c;
+ duty_cycles = (u32)c;
}
pm_runtime_get_sync(pc->chip.dev);
- reg_val = readw(pc->mmio_base + ECCTL2);
+ value = readw(pc->mmio_base + ECCTL2);
/* Configure APWM mode & disable sync option */
- reg_val |= ECCTL2_APWM_MODE | ECCTL2_SYNC_SEL_DISA;
+ value |= ECCTL2_APWM_MODE | ECCTL2_SYNC_SEL_DISA;
- writew(reg_val, pc->mmio_base + ECCTL2);
+ writew(value, pc->mmio_base + ECCTL2);
if (!pwm_is_enabled(pwm)) {
/* Update active registers if not running */
@@ -110,40 +110,45 @@ static int ecap_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
}
if (!pwm_is_enabled(pwm)) {
- reg_val = readw(pc->mmio_base + ECCTL2);
+ value = readw(pc->mmio_base + ECCTL2);
/* Disable APWM mode to put APWM output Low */
- reg_val &= ~ECCTL2_APWM_MODE;
- writew(reg_val, pc->mmio_base + ECCTL2);
+ value &= ~ECCTL2_APWM_MODE;
+ writew(value, pc->mmio_base + ECCTL2);
}
pm_runtime_put_sync(pc->chip.dev);
+
return 0;
}
static int ecap_pwm_set_polarity(struct pwm_chip *chip, struct pwm_device *pwm,
- enum pwm_polarity polarity)
+ enum pwm_polarity polarity)
{
struct ecap_pwm_chip *pc = to_ecap_pwm_chip(chip);
- unsigned short reg_val;
+ u16 value;
pm_runtime_get_sync(pc->chip.dev);
- reg_val = readw(pc->mmio_base + ECCTL2);
+
+ value = readw(pc->mmio_base + ECCTL2);
+
if (polarity == PWM_POLARITY_INVERSED)
/* Duty cycle defines LOW period of PWM */
- reg_val |= ECCTL2_APWM_POL_LOW;
+ value |= ECCTL2_APWM_POL_LOW;
else
/* Duty cycle defines HIGH period of PWM */
- reg_val &= ~ECCTL2_APWM_POL_LOW;
+ value &= ~ECCTL2_APWM_POL_LOW;
+
+ writew(value, pc->mmio_base + ECCTL2);
- writew(reg_val, pc->mmio_base + ECCTL2);
pm_runtime_put_sync(pc->chip.dev);
+
return 0;
}
static int ecap_pwm_enable(struct pwm_chip *chip, struct pwm_device *pwm)
{
struct ecap_pwm_chip *pc = to_ecap_pwm_chip(chip);
- unsigned int reg_val;
+ u16 value;
/* Leave clock enabled on enabling PWM */
pm_runtime_get_sync(pc->chip.dev);
@@ -152,24 +157,25 @@ static int ecap_pwm_enable(struct pwm_chip *chip, struct pwm_device *pwm)
* Enable 'Free run Time stamp counter mode' to start counter
* and 'APWM mode' to enable APWM output
*/
- reg_val = readw(pc->mmio_base + ECCTL2);
- reg_val |= ECCTL2_TSCTR_FREERUN | ECCTL2_APWM_MODE;
- writew(reg_val, pc->mmio_base + ECCTL2);
+ value = readw(pc->mmio_base + ECCTL2);
+ value |= ECCTL2_TSCTR_FREERUN | ECCTL2_APWM_MODE;
+ writew(value, pc->mmio_base + ECCTL2);
+
return 0;
}
static void ecap_pwm_disable(struct pwm_chip *chip, struct pwm_device *pwm)
{
struct ecap_pwm_chip *pc = to_ecap_pwm_chip(chip);
- unsigned int reg_val;
+ u16 value;
/*
* Disable 'Free run Time stamp counter mode' to stop counter
* and 'APWM mode' to put APWM output to low
*/
- reg_val = readw(pc->mmio_base + ECCTL2);
- reg_val &= ~(ECCTL2_TSCTR_FREERUN | ECCTL2_APWM_MODE);
- writew(reg_val, pc->mmio_base + ECCTL2);
+ value = readw(pc->mmio_base + ECCTL2);
+ value &= ~(ECCTL2_TSCTR_FREERUN | ECCTL2_APWM_MODE);
+ writew(value, pc->mmio_base + ECCTL2);
/* Disable clock on PWM disable */
pm_runtime_put_sync(pc->chip.dev);
@@ -184,12 +190,12 @@ static void ecap_pwm_free(struct pwm_chip *chip, struct pwm_device *pwm)
}
static const struct pwm_ops ecap_pwm_ops = {
- .free = ecap_pwm_free,
- .config = ecap_pwm_config,
- .set_polarity = ecap_pwm_set_polarity,
- .enable = ecap_pwm_enable,
- .disable = ecap_pwm_disable,
- .owner = THIS_MODULE,
+ .free = ecap_pwm_free,
+ .config = ecap_pwm_config,
+ .set_polarity = ecap_pwm_set_polarity,
+ .enable = ecap_pwm_enable,
+ .disable = ecap_pwm_disable,
+ .owner = THIS_MODULE,
};
static const struct of_device_id ecap_of_match[] = {
@@ -202,10 +208,10 @@ MODULE_DEVICE_TABLE(of, ecap_of_match);
static int ecap_pwm_probe(struct platform_device *pdev)
{
struct device_node *np = pdev->dev.of_node;
- int ret;
+ struct ecap_pwm_chip *pc;
struct resource *r;
struct clk *clk;
- struct ecap_pwm_chip *pc;
+ int ret;
pc = devm_kzalloc(&pdev->dev, sizeof(*pc), GFP_KERNEL);
if (!pc)
@@ -248,9 +254,9 @@ static int ecap_pwm_probe(struct platform_device *pdev)
return ret;
}
+ platform_set_drvdata(pdev, pc);
pm_runtime_enable(&pdev->dev);
- platform_set_drvdata(pdev, pc);
return 0;
}
@@ -259,6 +265,7 @@ static int ecap_pwm_remove(struct platform_device *pdev)
struct ecap_pwm_chip *pc = platform_get_drvdata(pdev);
pm_runtime_disable(&pdev->dev);
+
return pwmchip_remove(&pc->chip);
}
@@ -311,14 +318,13 @@ static SIMPLE_DEV_PM_OPS(ecap_pwm_pm_ops, ecap_pwm_suspend, ecap_pwm_resume);
static struct platform_driver ecap_pwm_driver = {
.driver = {
- .name = "ecap",
+ .name = "ecap",
.of_match_table = ecap_of_match,
- .pm = &ecap_pwm_pm_ops,
+ .pm = &ecap_pwm_pm_ops,
},
.probe = ecap_pwm_probe,
.remove = ecap_pwm_remove,
};
-
module_platform_driver(ecap_pwm_driver);
MODULE_DESCRIPTION("ECAP PWM driver");
generated by cgit v1.2.3 (git 2.39.1) at 2024-10-30 02:57:44 +0000