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path: root/drivers/pwm/pwm-tiehrpwm.c
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Diffstat (limited to 'drivers/pwm/pwm-tiehrpwm.c')
-rw-r--r--drivers/pwm/pwm-tiehrpwm.c112
1 files changed, 62 insertions, 50 deletions
diff --git a/drivers/pwm/pwm-tiehrpwm.c b/drivers/pwm/pwm-tiehrpwm.c
index 387eaf1bac85..6f87a0d5828d 100644
--- a/drivers/pwm/pwm-tiehrpwm.c
+++ b/drivers/pwm/pwm-tiehrpwm.c
@@ -122,12 +122,12 @@ struct ehrpwm_context {
};
struct ehrpwm_pwm_chip {
- struct pwm_chip chip;
- unsigned int clk_rate;
- void __iomem *mmio_base;
+ struct pwm_chip chip;
+ unsigned long clk_rate;
+ void __iomem *mmio_base;
unsigned long period_cycles[NUM_PWM_CHANNEL];
enum pwm_polarity polarity[NUM_PWM_CHANNEL];
- struct clk *tbclk;
+ struct clk *tbclk;
struct ehrpwm_context ctx;
};
@@ -136,25 +136,26 @@ static inline struct ehrpwm_pwm_chip *to_ehrpwm_pwm_chip(struct pwm_chip *chip)
return container_of(chip, struct ehrpwm_pwm_chip, chip);
}
-static inline u16 ehrpwm_read(void __iomem *base, int offset)
+static inline u16 ehrpwm_read(void __iomem *base, unsigned int offset)
{
return readw(base + offset);
}
-static inline void ehrpwm_write(void __iomem *base, int offset, unsigned int val)
+static inline void ehrpwm_write(void __iomem *base, unsigned int offset,
+ u16 value)
{
- writew(val & 0xFFFF, base + offset);
+ writew(value, base + offset);
}
-static void ehrpwm_modify(void __iomem *base, int offset,
- unsigned short mask, unsigned short val)
+static void ehrpwm_modify(void __iomem *base, unsigned int offset, u16 mask,
+ u16 value)
{
- unsigned short regval;
+ unsigned short val;
- regval = readw(base + offset);
- regval &= ~mask;
- regval |= val & mask;
- writew(regval, base + offset);
+ val = readw(base + offset);
+ val &= ~mask;
+ val |= value & mask;
+ writew(val, base + offset);
}
/**
@@ -163,14 +164,13 @@ static void ehrpwm_modify(void __iomem *base, int offset,
* @prescale_div: prescaler value set
* @tb_clk_div: Time Base Control prescaler bits
*/
-static int set_prescale_div(unsigned long rqst_prescaler,
- unsigned short *prescale_div, unsigned short *tb_clk_div)
+static int set_prescale_div(unsigned long rqst_prescaler, u16 *prescale_div,
+ u16 *tb_clk_div)
{
unsigned int clkdiv, hspclkdiv;
for (clkdiv = 0; clkdiv <= CLKDIV_MAX; clkdiv++) {
for (hspclkdiv = 0; hspclkdiv <= HSPCLKDIV_MAX; hspclkdiv++) {
-
/*
* calculations for prescaler value :
* prescale_div = HSPCLKDIVIDER * CLKDIVIDER.
@@ -191,13 +191,14 @@ static int set_prescale_div(unsigned long rqst_prescaler,
}
}
}
+
return 1;
}
static void configure_polarity(struct ehrpwm_pwm_chip *pc, int chan)
{
- int aqctl_reg;
- unsigned short aqctl_val, aqctl_mask;
+ u16 aqctl_val, aqctl_mask;
+ unsigned int aqctl_reg;
/*
* Configure PWM output to HIGH/LOW level on counter
@@ -232,13 +233,13 @@ static void configure_polarity(struct ehrpwm_pwm_chip *pc, int chan)
* duty_ns = 10^9 * (ps_divval * duty_cycles) / PWM_CLK_RATE
*/
static int ehrpwm_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
- int duty_ns, int period_ns)
+ int duty_ns, int period_ns)
{
struct ehrpwm_pwm_chip *pc = to_ehrpwm_pwm_chip(chip);
+ u32 period_cycles, duty_cycles;
+ u16 ps_divval, tb_divval;
+ unsigned int i, cmp_reg;
unsigned long long c;
- unsigned long period_cycles, duty_cycles;
- unsigned short ps_divval, tb_divval;
- int i, cmp_reg;
if (period_ns > NSEC_PER_SEC)
return -ERANGE;
@@ -272,8 +273,9 @@ static int ehrpwm_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
if (i == pwm->hwpwm)
continue;
- dev_err(chip->dev, "Period value conflicts with channel %d\n",
- i);
+ dev_err(chip->dev,
+ "period value conflicts with channel %u\n",
+ i);
return -EINVAL;
}
}
@@ -282,7 +284,7 @@ static int ehrpwm_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
/* Configure clock prescaler to support Low frequency PWM wave */
if (set_prescale_div(period_cycles/PERIOD_MAX, &ps_divval,
- &tb_divval)) {
+ &tb_divval)) {
dev_err(chip->dev, "Unsupported values\n");
return -EINVAL;
}
@@ -303,7 +305,7 @@ static int ehrpwm_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
/* Configure ehrpwm counter for up-count mode */
ehrpwm_modify(pc->mmio_base, TBCTL, TBCTL_CTRMODE_MASK,
- TBCTL_CTRMODE_UP);
+ TBCTL_CTRMODE_UP);
if (pwm->hwpwm == 1)
/* Channel 1 configured with compare B register */
@@ -315,23 +317,26 @@ static int ehrpwm_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
ehrpwm_write(pc->mmio_base, cmp_reg, duty_cycles);
pm_runtime_put_sync(chip->dev);
+
return 0;
}
static int ehrpwm_pwm_set_polarity(struct pwm_chip *chip,
- struct pwm_device *pwm, enum pwm_polarity polarity)
+ struct pwm_device *pwm,
+ enum pwm_polarity polarity)
{
struct ehrpwm_pwm_chip *pc = to_ehrpwm_pwm_chip(chip);
/* Configuration of polarity in hardware delayed, do at enable */
pc->polarity[pwm->hwpwm] = polarity;
+
return 0;
}
static int ehrpwm_pwm_enable(struct pwm_chip *chip, struct pwm_device *pwm)
{
struct ehrpwm_pwm_chip *pc = to_ehrpwm_pwm_chip(chip);
- unsigned short aqcsfrc_val, aqcsfrc_mask;
+ u16 aqcsfrc_val, aqcsfrc_mask;
int ret;
/* Leave clock enabled on enabling PWM */
@@ -348,7 +353,7 @@ static int ehrpwm_pwm_enable(struct pwm_chip *chip, struct pwm_device *pwm)
/* Changes to shadow mode */
ehrpwm_modify(pc->mmio_base, AQSFRC, AQSFRC_RLDCSF_MASK,
- AQSFRC_RLDCSF_ZRO);
+ AQSFRC_RLDCSF_ZRO);
ehrpwm_modify(pc->mmio_base, AQCSFRC, aqcsfrc_mask, aqcsfrc_val);
@@ -358,20 +363,21 @@ static int ehrpwm_pwm_enable(struct pwm_chip *chip, struct pwm_device *pwm)
/* Enable TBCLK before enabling PWM device */
ret = clk_enable(pc->tbclk);
if (ret) {
- dev_err(chip->dev, "Failed to enable TBCLK for %s\n",
- dev_name(pc->chip.dev));
+ dev_err(chip->dev, "Failed to enable TBCLK for %s: %d\n",
+ dev_name(pc->chip.dev), ret);
return ret;
}
/* Enable time counter for free_run */
ehrpwm_modify(pc->mmio_base, TBCTL, TBCTL_RUN_MASK, TBCTL_FREE_RUN);
+
return 0;
}
static void ehrpwm_pwm_disable(struct pwm_chip *chip, struct pwm_device *pwm)
{
struct ehrpwm_pwm_chip *pc = to_ehrpwm_pwm_chip(chip);
- unsigned short aqcsfrc_val, aqcsfrc_mask;
+ u16 aqcsfrc_val, aqcsfrc_mask;
/* Action Qualifier puts PWM output low forcefully */
if (pwm->hwpwm) {
@@ -387,7 +393,7 @@ static void ehrpwm_pwm_disable(struct pwm_chip *chip, struct pwm_device *pwm)
* Action Qualifier control on PWM output from next TBCLK
*/
ehrpwm_modify(pc->mmio_base, AQSFRC, AQSFRC_RLDCSF_MASK,
- AQSFRC_RLDCSF_IMDT);
+ AQSFRC_RLDCSF_IMDT);
ehrpwm_modify(pc->mmio_base, AQCSFRC, aqcsfrc_mask, aqcsfrc_val);
@@ -415,17 +421,17 @@ static void ehrpwm_pwm_free(struct pwm_chip *chip, struct pwm_device *pwm)
}
static const struct pwm_ops ehrpwm_pwm_ops = {
- .free = ehrpwm_pwm_free,
- .config = ehrpwm_pwm_config,
- .set_polarity = ehrpwm_pwm_set_polarity,
- .enable = ehrpwm_pwm_enable,
- .disable = ehrpwm_pwm_disable,
- .owner = THIS_MODULE,
+ .free = ehrpwm_pwm_free,
+ .config = ehrpwm_pwm_config,
+ .set_polarity = ehrpwm_pwm_set_polarity,
+ .enable = ehrpwm_pwm_enable,
+ .disable = ehrpwm_pwm_disable,
+ .owner = THIS_MODULE,
};
static const struct of_device_id ehrpwm_of_match[] = {
- { .compatible = "ti,am3352-ehrpwm" },
- { .compatible = "ti,am33xx-ehrpwm" },
+ { .compatible = "ti,am3352-ehrpwm" },
+ { .compatible = "ti,am33xx-ehrpwm" },
{},
};
MODULE_DEVICE_TABLE(of, ehrpwm_of_match);
@@ -433,10 +439,10 @@ MODULE_DEVICE_TABLE(of, ehrpwm_of_match);
static int ehrpwm_pwm_probe(struct platform_device *pdev)
{
struct device_node *np = pdev->dev.of_node;
- int ret;
+ struct ehrpwm_pwm_chip *pc;
struct resource *r;
struct clk *clk;
- struct ehrpwm_pwm_chip *pc;
+ int ret;
pc = devm_kzalloc(&pdev->dev, sizeof(*pc), GFP_KERNEL);
if (!pc)
@@ -510,6 +516,7 @@ static int ehrpwm_pwm_remove(struct platform_device *pdev)
clk_unprepare(pc->tbclk);
pm_runtime_disable(&pdev->dev);
+
return pwmchip_remove(&pc->chip);
}
@@ -517,6 +524,7 @@ static int ehrpwm_pwm_remove(struct platform_device *pdev)
static void ehrpwm_pwm_save_context(struct ehrpwm_pwm_chip *pc)
{
pm_runtime_get_sync(pc->chip.dev);
+
pc->ctx.tbctl = ehrpwm_read(pc->mmio_base, TBCTL);
pc->ctx.tbprd = ehrpwm_read(pc->mmio_base, TBPRD);
pc->ctx.cmpa = ehrpwm_read(pc->mmio_base, CMPA);
@@ -525,6 +533,7 @@ static void ehrpwm_pwm_save_context(struct ehrpwm_pwm_chip *pc)
pc->ctx.aqctlb = ehrpwm_read(pc->mmio_base, AQCTLB);
pc->ctx.aqsfrc = ehrpwm_read(pc->mmio_base, AQSFRC);
pc->ctx.aqcsfrc = ehrpwm_read(pc->mmio_base, AQCSFRC);
+
pm_runtime_put_sync(pc->chip.dev);
}
@@ -543,9 +552,10 @@ static void ehrpwm_pwm_restore_context(struct ehrpwm_pwm_chip *pc)
static int ehrpwm_pwm_suspend(struct device *dev)
{
struct ehrpwm_pwm_chip *pc = dev_get_drvdata(dev);
- int i;
+ unsigned int i;
ehrpwm_pwm_save_context(pc);
+
for (i = 0; i < pc->chip.npwm; i++) {
struct pwm_device *pwm = &pc->chip.pwms[i];
@@ -555,13 +565,14 @@ static int ehrpwm_pwm_suspend(struct device *dev)
/* Disable explicitly if PWM is running */
pm_runtime_put_sync(dev);
}
+
return 0;
}
static int ehrpwm_pwm_resume(struct device *dev)
{
struct ehrpwm_pwm_chip *pc = dev_get_drvdata(dev);
- int i;
+ unsigned int i;
for (i = 0; i < pc->chip.npwm; i++) {
struct pwm_device *pwm = &pc->chip.pwms[i];
@@ -572,24 +583,25 @@ static int ehrpwm_pwm_resume(struct device *dev)
/* Enable explicitly if PWM was running */
pm_runtime_get_sync(dev);
}
+
ehrpwm_pwm_restore_context(pc);
+
return 0;
}
#endif
static SIMPLE_DEV_PM_OPS(ehrpwm_pwm_pm_ops, ehrpwm_pwm_suspend,
- ehrpwm_pwm_resume);
+ ehrpwm_pwm_resume);
static struct platform_driver ehrpwm_pwm_driver = {
.driver = {
- .name = "ehrpwm",
+ .name = "ehrpwm",
.of_match_table = ehrpwm_of_match,
- .pm = &ehrpwm_pwm_pm_ops,
+ .pm = &ehrpwm_pwm_pm_ops,
},
.probe = ehrpwm_pwm_probe,
.remove = ehrpwm_pwm_remove,
};
-
module_platform_driver(ehrpwm_pwm_driver);
MODULE_DESCRIPTION("EHRPWM PWM driver");
generated by cgit v1.2.3 (git 2.39.0) at 2024-12-27 07:37:53 +0300