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path: root/drivers/misc/ep93xx_pwm.c
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Diffstat (limited to 'drivers/misc/ep93xx_pwm.c')
-rw-r--r--drivers/misc/ep93xx_pwm.c188
1 files changed, 50 insertions, 138 deletions
diff --git a/drivers/misc/ep93xx_pwm.c b/drivers/misc/ep93xx_pwm.c
index 96787ec15cad..cdb67a9c1959 100644
--- a/drivers/misc/ep93xx_pwm.c
+++ b/drivers/misc/ep93xx_pwm.c
@@ -39,63 +39,6 @@ struct ep93xx_pwm {
u32 duty_percent;
};
-static inline void ep93xx_pwm_writel(struct ep93xx_pwm *pwm,
- unsigned int val, unsigned int off)
-{
- __raw_writel(val, pwm->mmio_base + off);
-}
-
-static inline unsigned int ep93xx_pwm_readl(struct ep93xx_pwm *pwm,
- unsigned int off)
-{
- return __raw_readl(pwm->mmio_base + off);
-}
-
-static inline void ep93xx_pwm_write_tc(struct ep93xx_pwm *pwm, u16 value)
-{
- ep93xx_pwm_writel(pwm, value, EP93XX_PWMx_TERM_COUNT);
-}
-
-static inline u16 ep93xx_pwm_read_tc(struct ep93xx_pwm *pwm)
-{
- return ep93xx_pwm_readl(pwm, EP93XX_PWMx_TERM_COUNT);
-}
-
-static inline void ep93xx_pwm_write_dc(struct ep93xx_pwm *pwm, u16 value)
-{
- ep93xx_pwm_writel(pwm, value, EP93XX_PWMx_DUTY_CYCLE);
-}
-
-static inline void ep93xx_pwm_enable(struct ep93xx_pwm *pwm)
-{
- ep93xx_pwm_writel(pwm, 0x1, EP93XX_PWMx_ENABLE);
-}
-
-static inline void ep93xx_pwm_disable(struct ep93xx_pwm *pwm)
-{
- ep93xx_pwm_writel(pwm, 0x0, EP93XX_PWMx_ENABLE);
-}
-
-static inline int ep93xx_pwm_is_enabled(struct ep93xx_pwm *pwm)
-{
- return ep93xx_pwm_readl(pwm, EP93XX_PWMx_ENABLE) & 0x1;
-}
-
-static inline void ep93xx_pwm_invert(struct ep93xx_pwm *pwm)
-{
- ep93xx_pwm_writel(pwm, 0x1, EP93XX_PWMx_INVERT);
-}
-
-static inline void ep93xx_pwm_normal(struct ep93xx_pwm *pwm)
-{
- ep93xx_pwm_writel(pwm, 0x0, EP93XX_PWMx_INVERT);
-}
-
-static inline int ep93xx_pwm_is_inverted(struct ep93xx_pwm *pwm)
-{
- return ep93xx_pwm_readl(pwm, EP93XX_PWMx_INVERT) & 0x1;
-}
-
/*
* /sys/devices/platform/ep93xx-pwm.N
* /min_freq read-only minimum pwm output frequency
@@ -131,9 +74,9 @@ static ssize_t ep93xx_pwm_get_freq(struct device *dev,
struct platform_device *pdev = to_platform_device(dev);
struct ep93xx_pwm *pwm = platform_get_drvdata(pdev);
- if (ep93xx_pwm_is_enabled(pwm)) {
+ if (readl(pwm->mmio_base + EP93XX_PWMx_ENABLE) & 0x1) {
unsigned long rate = clk_get_rate(pwm->clk);
- u16 term = ep93xx_pwm_read_tc(pwm);
+ u16 term = readl(pwm->mmio_base + EP93XX_PWMx_TERM_COUNT);
return sprintf(buf, "%ld\n", rate / (term + 1));
} else {
@@ -149,12 +92,12 @@ static ssize_t ep93xx_pwm_set_freq(struct device *dev,
long val;
int err;
- err = strict_strtol(buf, 10, &val);
+ err = kstrtol(buf, 10, &val);
if (err)
return -EINVAL;
if (val == 0) {
- ep93xx_pwm_disable(pwm);
+ writel(0x0, pwm->mmio_base + EP93XX_PWMx_ENABLE);
} else if (val <= (clk_get_rate(pwm->clk) / 2)) {
u32 term, duty;
@@ -164,20 +107,20 @@ static ssize_t ep93xx_pwm_set_freq(struct device *dev,
if (val < 1)
val = 1;
- term = ep93xx_pwm_read_tc(pwm);
+ term = readl(pwm->mmio_base + EP93XX_PWMx_TERM_COUNT);
duty = ((val + 1) * pwm->duty_percent / 100) - 1;
/* If pwm is running, order is important */
if (val > term) {
- ep93xx_pwm_write_tc(pwm, val);
- ep93xx_pwm_write_dc(pwm, duty);
+ writel(val, pwm->mmio_base + EP93XX_PWMx_TERM_COUNT);
+ writel(duty, pwm->mmio_base + EP93XX_PWMx_DUTY_CYCLE);
} else {
- ep93xx_pwm_write_dc(pwm, duty);
- ep93xx_pwm_write_tc(pwm, val);
+ writel(duty, pwm->mmio_base + EP93XX_PWMx_DUTY_CYCLE);
+ writel(val, pwm->mmio_base + EP93XX_PWMx_TERM_COUNT);
}
- if (!ep93xx_pwm_is_enabled(pwm))
- ep93xx_pwm_enable(pwm);
+ if (!readl(pwm->mmio_base + EP93XX_PWMx_ENABLE) & 0x1)
+ writel(0x1, pwm->mmio_base + EP93XX_PWMx_ENABLE);
} else {
return -EINVAL;
}
@@ -202,13 +145,15 @@ static ssize_t ep93xx_pwm_set_duty_percent(struct device *dev,
long val;
int err;
- err = strict_strtol(buf, 10, &val);
+ err = kstrtol(buf, 10, &val);
if (err)
return -EINVAL;
if (val > 0 && val < 100) {
- u32 term = ep93xx_pwm_read_tc(pwm);
- ep93xx_pwm_write_dc(pwm, ((term + 1) * val / 100) - 1);
+ u32 term = readl(pwm->mmio_base + EP93XX_PWMx_TERM_COUNT);
+ u32 duty = ((term + 1) * val / 100) - 1;
+
+ writel(duty, pwm->mmio_base + EP93XX_PWMx_DUTY_CYCLE);
pwm->duty_percent = val;
return count;
}
@@ -221,8 +166,9 @@ static ssize_t ep93xx_pwm_get_invert(struct device *dev,
{
struct platform_device *pdev = to_platform_device(dev);
struct ep93xx_pwm *pwm = platform_get_drvdata(pdev);
+ int inverted = readl(pwm->mmio_base + EP93XX_PWMx_INVERT) & 0x1;
- return sprintf(buf, "%d\n", ep93xx_pwm_is_inverted(pwm));
+ return sprintf(buf, "%d\n", inverted);
}
static ssize_t ep93xx_pwm_set_invert(struct device *dev,
@@ -233,14 +179,14 @@ static ssize_t ep93xx_pwm_set_invert(struct device *dev,
long val;
int err;
- err = strict_strtol(buf, 10, &val);
+ err = kstrtol(buf, 10, &val);
if (err)
return -EINVAL;
if (val == 0)
- ep93xx_pwm_normal(pwm);
+ writel(0x0, pwm->mmio_base + EP93XX_PWMx_INVERT);
else if (val == 1)
- ep93xx_pwm_invert(pwm);
+ writel(0x1, pwm->mmio_base + EP93XX_PWMx_INVERT);
else
return -EINVAL;
@@ -269,89 +215,55 @@ static const struct attribute_group ep93xx_pwm_sysfs_files = {
.attrs = ep93xx_pwm_attrs,
};
-static int __init ep93xx_pwm_probe(struct platform_device *pdev)
+static int ep93xx_pwm_probe(struct platform_device *pdev)
{
struct ep93xx_pwm *pwm;
struct resource *res;
- int err;
+ int ret;
- err = ep93xx_pwm_acquire_gpio(pdev);
- if (err)
- return err;
+ pwm = devm_kzalloc(&pdev->dev, sizeof(*pwm), GFP_KERNEL);
+ if (!pwm)
+ return -ENOMEM;
- pwm = kzalloc(sizeof(struct ep93xx_pwm), GFP_KERNEL);
- if (!pwm) {
- err = -ENOMEM;
- goto fail_no_mem;
- }
+ pwm->clk = devm_clk_get(&pdev->dev, "pwm_clk");
+ if (IS_ERR(pwm->clk))
+ return PTR_ERR(pwm->clk);
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
- if (res == NULL) {
- err = -ENXIO;
- goto fail_no_mem_resource;
- }
-
- res = request_mem_region(res->start, resource_size(res), pdev->name);
- if (res == NULL) {
- err = -EBUSY;
- goto fail_no_mem_resource;
- }
-
- pwm->mmio_base = ioremap(res->start, resource_size(res));
- if (pwm->mmio_base == NULL) {
- err = -ENXIO;
- goto fail_no_ioremap;
- }
-
- err = sysfs_create_group(&pdev->dev.kobj, &ep93xx_pwm_sysfs_files);
- if (err)
- goto fail_no_sysfs;
-
- pwm->clk = clk_get(&pdev->dev, "pwm_clk");
- if (IS_ERR(pwm->clk)) {
- err = PTR_ERR(pwm->clk);
- goto fail_no_clk;
+ pwm->mmio_base = devm_ioremap_resource(&pdev->dev, res);
+ if (IS_ERR(pwm->mmio_base))
+ return PTR_ERR(pwm->mmio_base);
+
+ ret = ep93xx_pwm_acquire_gpio(pdev);
+ if (ret)
+ return ret;
+
+ ret = sysfs_create_group(&pdev->dev.kobj, &ep93xx_pwm_sysfs_files);
+ if (ret) {
+ ep93xx_pwm_release_gpio(pdev);
+ return ret;
}
pwm->duty_percent = 50;
- platform_set_drvdata(pdev, pwm);
-
/* disable pwm at startup. Avoids zero value. */
- ep93xx_pwm_disable(pwm);
- ep93xx_pwm_write_tc(pwm, EP93XX_PWM_MAX_COUNT);
- ep93xx_pwm_write_dc(pwm, EP93XX_PWM_MAX_COUNT / 2);
+ writel(0x0, pwm->mmio_base + EP93XX_PWMx_ENABLE);
+ writel(EP93XX_PWM_MAX_COUNT, pwm->mmio_base + EP93XX_PWMx_TERM_COUNT);
+ writel(EP93XX_PWM_MAX_COUNT/2, pwm->mmio_base + EP93XX_PWMx_DUTY_CYCLE);
clk_enable(pwm->clk);
+ platform_set_drvdata(pdev, pwm);
return 0;
-
-fail_no_clk:
- sysfs_remove_group(&pdev->dev.kobj, &ep93xx_pwm_sysfs_files);
-fail_no_sysfs:
- iounmap(pwm->mmio_base);
-fail_no_ioremap:
- release_mem_region(res->start, resource_size(res));
-fail_no_mem_resource:
- kfree(pwm);
-fail_no_mem:
- ep93xx_pwm_release_gpio(pdev);
- return err;
}
-static int __exit ep93xx_pwm_remove(struct platform_device *pdev)
+static int ep93xx_pwm_remove(struct platform_device *pdev)
{
struct ep93xx_pwm *pwm = platform_get_drvdata(pdev);
- struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
- ep93xx_pwm_disable(pwm);
+ writel(0x0, pwm->mmio_base + EP93XX_PWMx_ENABLE);
clk_disable(pwm->clk);
- clk_put(pwm->clk);
- platform_set_drvdata(pdev, NULL);
sysfs_remove_group(&pdev->dev.kobj, &ep93xx_pwm_sysfs_files);
- iounmap(pwm->mmio_base);
- release_mem_region(res->start, resource_size(res));
- kfree(pwm);
ep93xx_pwm_release_gpio(pdev);
return 0;
@@ -362,10 +274,10 @@ static struct platform_driver ep93xx_pwm_driver = {
.name = "ep93xx-pwm",
.owner = THIS_MODULE,
},
- .remove = __exit_p(ep93xx_pwm_remove),
+ .probe = ep93xx_pwm_probe,
+ .remove = ep93xx_pwm_remove,
};
-
-module_platform_driver_probe(ep93xx_pwm_driver, ep93xx_pwm_probe);
+module_platform_driver(ep93xx_pwm_driver);
MODULE_AUTHOR("Matthieu Crapet <mcrapet@gmail.com>, "
"H Hartley Sweeten <hsweeten@visionengravers.com>");
generated by cgit v1.2.3 (git 2.39.0) at 2024-11-19 10:34:49 +0300