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path: root/drivers/pwm/pwm-sun4i.c
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Diffstat (limited to 'drivers/pwm/pwm-sun4i.c')
-rw-r--r--drivers/pwm/pwm-sun4i.c106
1 files changed, 47 insertions, 59 deletions
diff --git a/drivers/pwm/pwm-sun4i.c b/drivers/pwm/pwm-sun4i.c
index b973da73e9ab..6c5591ca868b 100644
--- a/drivers/pwm/pwm-sun4i.c
+++ b/drivers/pwm/pwm-sun4i.c
@@ -17,12 +17,10 @@
#include <linux/jiffies.h>
#include <linux/module.h>
#include <linux/of.h>
-#include <linux/of_device.h>
#include <linux/platform_device.h>
#include <linux/pwm.h>
#include <linux/reset.h>
#include <linux/slab.h>
-#include <linux/spinlock.h>
#include <linux/time.h>
#define PWM_CTRL_REG 0x0
@@ -82,46 +80,44 @@ struct sun4i_pwm_data {
};
struct sun4i_pwm_chip {
- struct pwm_chip chip;
struct clk *bus_clk;
struct clk *clk;
struct reset_control *rst;
void __iomem *base;
- spinlock_t ctrl_lock;
const struct sun4i_pwm_data *data;
};
static inline struct sun4i_pwm_chip *to_sun4i_pwm_chip(struct pwm_chip *chip)
{
- return container_of(chip, struct sun4i_pwm_chip, chip);
+ return pwmchip_get_drvdata(chip);
}
-static inline u32 sun4i_pwm_readl(struct sun4i_pwm_chip *chip,
+static inline u32 sun4i_pwm_readl(struct sun4i_pwm_chip *sun4ichip,
unsigned long offset)
{
- return readl(chip->base + offset);
+ return readl(sun4ichip->base + offset);
}
-static inline void sun4i_pwm_writel(struct sun4i_pwm_chip *chip,
+static inline void sun4i_pwm_writel(struct sun4i_pwm_chip *sun4ichip,
u32 val, unsigned long offset)
{
- writel(val, chip->base + offset);
+ writel(val, sun4ichip->base + offset);
}
static int sun4i_pwm_get_state(struct pwm_chip *chip,
struct pwm_device *pwm,
struct pwm_state *state)
{
- struct sun4i_pwm_chip *sun4i_pwm = to_sun4i_pwm_chip(chip);
+ struct sun4i_pwm_chip *sun4ichip = to_sun4i_pwm_chip(chip);
u64 clk_rate, tmp;
u32 val;
unsigned int prescaler;
- clk_rate = clk_get_rate(sun4i_pwm->clk);
+ clk_rate = clk_get_rate(sun4ichip->clk);
if (!clk_rate)
return -EINVAL;
- val = sun4i_pwm_readl(sun4i_pwm, PWM_CTRL_REG);
+ val = sun4i_pwm_readl(sun4ichip, PWM_CTRL_REG);
/*
* PWM chapter in H6 manual has a diagram which explains that if bypass
@@ -129,7 +125,7 @@ static int sun4i_pwm_get_state(struct pwm_chip *chip,
* proved that also enable bit is ignored in this case.
*/
if ((val & BIT_CH(PWM_BYPASS, pwm->hwpwm)) &&
- sun4i_pwm->data->has_direct_mod_clk_output) {
+ sun4ichip->data->has_direct_mod_clk_output) {
state->period = DIV_ROUND_UP_ULL(NSEC_PER_SEC, clk_rate);
state->duty_cycle = DIV_ROUND_UP_ULL(state->period, 2);
state->polarity = PWM_POLARITY_NORMAL;
@@ -138,7 +134,7 @@ static int sun4i_pwm_get_state(struct pwm_chip *chip,
}
if ((PWM_REG_PRESCAL(val, pwm->hwpwm) == PWM_PRESCAL_MASK) &&
- sun4i_pwm->data->has_prescaler_bypass)
+ sun4ichip->data->has_prescaler_bypass)
prescaler = 1;
else
prescaler = prescaler_table[PWM_REG_PRESCAL(val, pwm->hwpwm)];
@@ -157,7 +153,7 @@ static int sun4i_pwm_get_state(struct pwm_chip *chip,
else
state->enabled = false;
- val = sun4i_pwm_readl(sun4i_pwm, PWM_CH_PRD(pwm->hwpwm));
+ val = sun4i_pwm_readl(sun4ichip, PWM_CH_PRD(pwm->hwpwm));
tmp = (u64)prescaler * NSEC_PER_SEC * PWM_REG_DTY(val);
state->duty_cycle = DIV_ROUND_CLOSEST_ULL(tmp, clk_rate);
@@ -168,7 +164,7 @@ static int sun4i_pwm_get_state(struct pwm_chip *chip,
return 0;
}
-static int sun4i_pwm_calculate(struct sun4i_pwm_chip *sun4i_pwm,
+static int sun4i_pwm_calculate(struct sun4i_pwm_chip *sun4ichip,
const struct pwm_state *state,
u32 *dty, u32 *prd, unsigned int *prsclr,
bool *bypass)
@@ -176,9 +172,9 @@ static int sun4i_pwm_calculate(struct sun4i_pwm_chip *sun4i_pwm,
u64 clk_rate, div = 0;
unsigned int prescaler = 0;
- clk_rate = clk_get_rate(sun4i_pwm->clk);
+ clk_rate = clk_get_rate(sun4ichip->clk);
- *bypass = sun4i_pwm->data->has_direct_mod_clk_output &&
+ *bypass = sun4ichip->data->has_direct_mod_clk_output &&
state->enabled &&
(state->period * clk_rate >= NSEC_PER_SEC) &&
(state->period * clk_rate < 2 * NSEC_PER_SEC) &&
@@ -188,7 +184,7 @@ static int sun4i_pwm_calculate(struct sun4i_pwm_chip *sun4i_pwm,
if (*bypass)
return 0;
- if (sun4i_pwm->data->has_prescaler_bypass) {
+ if (sun4ichip->data->has_prescaler_bypass) {
/* First, test without any prescaler when available */
prescaler = PWM_PRESCAL_MASK;
/*
@@ -234,7 +230,7 @@ static int sun4i_pwm_calculate(struct sun4i_pwm_chip *sun4i_pwm,
static int sun4i_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm,
const struct pwm_state *state)
{
- struct sun4i_pwm_chip *sun4i_pwm = to_sun4i_pwm_chip(chip);
+ struct sun4i_pwm_chip *sun4ichip = to_sun4i_pwm_chip(chip);
struct pwm_state cstate;
u32 ctrl, duty = 0, period = 0, val;
int ret;
@@ -244,31 +240,29 @@ static int sun4i_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm,
pwm_get_state(pwm, &cstate);
if (!cstate.enabled) {
- ret = clk_prepare_enable(sun4i_pwm->clk);
+ ret = clk_prepare_enable(sun4ichip->clk);
if (ret) {
- dev_err(chip->dev, "failed to enable PWM clock\n");
+ dev_err(pwmchip_parent(chip), "failed to enable PWM clock\n");
return ret;
}
}
- ret = sun4i_pwm_calculate(sun4i_pwm, state, &duty, &period, &prescaler,
+ ret = sun4i_pwm_calculate(sun4ichip, state, &duty, &period, &prescaler,
&bypass);
if (ret) {
- dev_err(chip->dev, "period exceeds the maximum value\n");
+ dev_err(pwmchip_parent(chip), "period exceeds the maximum value\n");
if (!cstate.enabled)
- clk_disable_unprepare(sun4i_pwm->clk);
+ clk_disable_unprepare(sun4ichip->clk);
return ret;
}
- spin_lock(&sun4i_pwm->ctrl_lock);
- ctrl = sun4i_pwm_readl(sun4i_pwm, PWM_CTRL_REG);
+ ctrl = sun4i_pwm_readl(sun4ichip, PWM_CTRL_REG);
- if (sun4i_pwm->data->has_direct_mod_clk_output) {
+ if (sun4ichip->data->has_direct_mod_clk_output) {
if (bypass) {
ctrl |= BIT_CH(PWM_BYPASS, pwm->hwpwm);
/* We can skip other parameter */
- sun4i_pwm_writel(sun4i_pwm, ctrl, PWM_CTRL_REG);
- spin_unlock(&sun4i_pwm->ctrl_lock);
+ sun4i_pwm_writel(sun4ichip, ctrl, PWM_CTRL_REG);
return 0;
}
@@ -278,14 +272,14 @@ static int sun4i_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm,
if (PWM_REG_PRESCAL(ctrl, pwm->hwpwm) != prescaler) {
/* Prescaler changed, the clock has to be gated */
ctrl &= ~BIT_CH(PWM_CLK_GATING, pwm->hwpwm);
- sun4i_pwm_writel(sun4i_pwm, ctrl, PWM_CTRL_REG);
+ sun4i_pwm_writel(sun4ichip, ctrl, PWM_CTRL_REG);
ctrl &= ~BIT_CH(PWM_PRESCAL_MASK, pwm->hwpwm);
ctrl |= BIT_CH(prescaler, pwm->hwpwm);
}
val = (duty & PWM_DTY_MASK) | PWM_PRD(period);
- sun4i_pwm_writel(sun4i_pwm, val, PWM_CH_PRD(pwm->hwpwm));
+ sun4i_pwm_writel(sun4ichip, val, PWM_CH_PRD(pwm->hwpwm));
if (state->polarity != PWM_POLARITY_NORMAL)
ctrl &= ~BIT_CH(PWM_ACT_STATE, pwm->hwpwm);
@@ -297,9 +291,7 @@ static int sun4i_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm,
if (state->enabled)
ctrl |= BIT_CH(PWM_EN, pwm->hwpwm);
- sun4i_pwm_writel(sun4i_pwm, ctrl, PWM_CTRL_REG);
-
- spin_unlock(&sun4i_pwm->ctrl_lock);
+ sun4i_pwm_writel(sun4ichip, ctrl, PWM_CTRL_REG);
if (state->enabled)
return 0;
@@ -311,14 +303,12 @@ static int sun4i_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm,
else
usleep_range(delay_us, delay_us * 2);
- spin_lock(&sun4i_pwm->ctrl_lock);
- ctrl = sun4i_pwm_readl(sun4i_pwm, PWM_CTRL_REG);
+ ctrl = sun4i_pwm_readl(sun4ichip, PWM_CTRL_REG);
ctrl &= ~BIT_CH(PWM_CLK_GATING, pwm->hwpwm);
ctrl &= ~BIT_CH(PWM_EN, pwm->hwpwm);
- sun4i_pwm_writel(sun4i_pwm, ctrl, PWM_CTRL_REG);
- spin_unlock(&sun4i_pwm->ctrl_lock);
+ sun4i_pwm_writel(sun4ichip, ctrl, PWM_CTRL_REG);
- clk_disable_unprepare(sun4i_pwm->clk);
+ clk_disable_unprepare(sun4ichip->clk);
return 0;
}
@@ -326,7 +316,6 @@ static int sun4i_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm,
static const struct pwm_ops sun4i_pwm_ops = {
.apply = sun4i_pwm_apply,
.get_state = sun4i_pwm_get_state,
- .owner = THIS_MODULE,
};
static const struct sun4i_pwm_data sun4i_pwm_dual_nobypass = {
@@ -386,17 +375,21 @@ MODULE_DEVICE_TABLE(of, sun4i_pwm_dt_ids);
static int sun4i_pwm_probe(struct platform_device *pdev)
{
+ struct pwm_chip *chip;
+ const struct sun4i_pwm_data *data;
struct sun4i_pwm_chip *sun4ichip;
int ret;
- sun4ichip = devm_kzalloc(&pdev->dev, sizeof(*sun4ichip), GFP_KERNEL);
- if (!sun4ichip)
- return -ENOMEM;
-
- sun4ichip->data = of_device_get_match_data(&pdev->dev);
- if (!sun4ichip->data)
+ data = of_device_get_match_data(&pdev->dev);
+ if (!data)
return -ENODEV;
+ chip = devm_pwmchip_alloc(&pdev->dev, data->npwm, sizeof(*sun4ichip));
+ if (IS_ERR(chip))
+ return PTR_ERR(chip);
+ sun4ichip = to_sun4i_pwm_chip(chip);
+
+ sun4ichip->data = data;
sun4ichip->base = devm_platform_ioremap_resource(pdev, 0);
if (IS_ERR(sun4ichip->base))
return PTR_ERR(sun4ichip->base);
@@ -453,19 +446,15 @@ static int sun4i_pwm_probe(struct platform_device *pdev)
goto err_bus;
}
- sun4ichip->chip.dev = &pdev->dev;
- sun4ichip->chip.ops = &sun4i_pwm_ops;
- sun4ichip->chip.npwm = sun4ichip->data->npwm;
+ chip->ops = &sun4i_pwm_ops;
- spin_lock_init(&sun4ichip->ctrl_lock);
-
- ret = pwmchip_add(&sun4ichip->chip);
+ ret = pwmchip_add(chip);
if (ret < 0) {
dev_err(&pdev->dev, "failed to add PWM chip: %d\n", ret);
goto err_pwm_add;
}
- platform_set_drvdata(pdev, sun4ichip);
+ platform_set_drvdata(pdev, chip);
return 0;
@@ -477,16 +466,15 @@ err_bus:
return ret;
}
-static int sun4i_pwm_remove(struct platform_device *pdev)
+static void sun4i_pwm_remove(struct platform_device *pdev)
{
- struct sun4i_pwm_chip *sun4ichip = platform_get_drvdata(pdev);
+ struct pwm_chip *chip = platform_get_drvdata(pdev);
+ struct sun4i_pwm_chip *sun4ichip = to_sun4i_pwm_chip(chip);
- pwmchip_remove(&sun4ichip->chip);
+ pwmchip_remove(chip);
clk_disable_unprepare(sun4ichip->bus_clk);
reset_control_assert(sun4ichip->rst);
-
- return 0;
}
static struct platform_driver sun4i_pwm_driver = {
generated by cgit (git 2.34.1) at 2025-12-21 19:32:22 +0000