[PATCH 2/3] ARM Samsung: Move s3c pwm driver to pwm framework
Sascha Hauer
s.hauer at pengutronix.de
Thu Mar 15 05:04:36 EDT 2012
Move the driver to drivers/pwm/ and convert it to use the framework.
Signed-off-by: Sascha Hauer <s.hauer at pengutronix.de>
Cc: Ben Dooks <ben-linux at fluff.org>
Cc: Kukjin Kim <kgene.kim at samsung.com>
---
arch/arm/plat-samsung/Makefile | 4 -
drivers/pwm/Kconfig | 9 +
drivers/pwm/Makefile | 1 +
.../pwm.c => drivers/pwm/pwm-samsung.c | 215 ++++++++------------
4 files changed, 91 insertions(+), 138 deletions(-)
rename arch/arm/plat-samsung/pwm.c => drivers/pwm/pwm-samsung.c (61%)
diff --git a/arch/arm/plat-samsung/Makefile b/arch/arm/plat-samsung/Makefile
index 6012366..f09a7cf 100644
--- a/arch/arm/plat-samsung/Makefile
+++ b/arch/arm/plat-samsung/Makefile
@@ -50,7 +50,3 @@ obj-$(CONFIG_SAMSUNG_WAKEMASK) += wakeup-mask.o
# PD support
obj-$(CONFIG_SAMSUNG_PD) += pd.o
-
-# PWM support
-
-obj-$(CONFIG_HAVE_PWM) += pwm.o
diff --git a/drivers/pwm/Kconfig b/drivers/pwm/Kconfig
index a9a9715..0d9aa92 100644
--- a/drivers/pwm/Kconfig
+++ b/drivers/pwm/Kconfig
@@ -36,6 +36,15 @@ config PWM_PXA
To compile this driver as a module, choose M here: the module
will be called pwm-pxa.
+config PWM_SAMSUNG
+ tristate "Samsung pwm support"
+ depends on PLAT_SAMSUNG
+ help
+ Generic PWM framework driver for Samsung.
+
+ To compile this driver as a module, choose M here: the module
+ will be called pwm-samsung.
+
config PWM_TEGRA
tristate "NVIDIA Tegra PWM support"
depends on ARCH_TEGRA
diff --git a/drivers/pwm/Makefile b/drivers/pwm/Makefile
index fc7571e..2d613e0 100644
--- a/drivers/pwm/Makefile
+++ b/drivers/pwm/Makefile
@@ -2,4 +2,5 @@ obj-$(CONFIG_PWM) += core.o
obj-$(CONFIG_PWM_BFIN) += pwm-bfin.o
obj-$(CONFIG_PWM_IMX) += imx-pwm.o
obj-$(CONFIG_PWM_PXA) += pwm-pxa.o
+obj-$(CONFIG_PWM_SAMSUNG) += samsung-pwm.o
obj-$(CONFIG_PWM_TEGRA) += pwm-tegra.o
diff --git a/arch/arm/plat-samsung/pwm.c b/drivers/pwm/pwm-samsung.c
similarity index 61%
rename from arch/arm/plat-samsung/pwm.c
rename to drivers/pwm/pwm-samsung.c
index c559d84..5640ba3 100644
--- a/arch/arm/plat-samsung/pwm.c
+++ b/drivers/pwm/pwm-samsung.c
@@ -24,7 +24,7 @@
#include <plat/regs-timer.h>
-struct pwm_device {
+struct s3c_pwm_device {
struct list_head list;
struct platform_device *pdev;
@@ -37,110 +37,62 @@ struct pwm_device {
unsigned char tcon_base;
unsigned char running;
- unsigned char use_count;
unsigned char pwm_id;
+ struct pwm_chip chip;
};
+#define to_s3c_pwm_device(chip) container_of(chip, struct s3c_pwm_device, chip)
+
#define pwm_dbg(_pwm, msg...) dev_dbg(&(_pwm)->pdev->dev, msg)
static struct clk *clk_scaler[2];
-static inline int pwm_is_tdiv(struct pwm_device *pwm)
+static inline int pwm_is_tdiv(struct s3c_pwm_device *pwm)
{
return clk_get_parent(pwm->clk) == pwm->clk_div;
}
-static DEFINE_MUTEX(pwm_lock);
-static LIST_HEAD(pwm_list);
-
-struct pwm_device *pwm_request(int pwm_id, const char *label)
-{
- struct pwm_device *pwm;
- int found = 0;
-
- mutex_lock(&pwm_lock);
-
- list_for_each_entry(pwm, &pwm_list, list) {
- if (pwm->pwm_id == pwm_id) {
- found = 1;
- break;
- }
- }
-
- if (found) {
- if (pwm->use_count == 0) {
- pwm->use_count = 1;
- pwm->label = label;
- } else
- pwm = ERR_PTR(-EBUSY);
- } else
- pwm = ERR_PTR(-ENOENT);
-
- mutex_unlock(&pwm_lock);
- return pwm;
-}
-
-EXPORT_SYMBOL(pwm_request);
-
-
-void pwm_free(struct pwm_device *pwm)
-{
- mutex_lock(&pwm_lock);
-
- if (pwm->use_count) {
- pwm->use_count--;
- pwm->label = NULL;
- } else
- printk(KERN_ERR "PWM%d device already freed\n", pwm->pwm_id);
-
- mutex_unlock(&pwm_lock);
-}
-
-EXPORT_SYMBOL(pwm_free);
-
#define pwm_tcon_start(pwm) (1 << (pwm->tcon_base + 0))
#define pwm_tcon_invert(pwm) (1 << (pwm->tcon_base + 2))
#define pwm_tcon_autoreload(pwm) (1 << (pwm->tcon_base + 3))
#define pwm_tcon_manulupdate(pwm) (1 << (pwm->tcon_base + 1))
-int pwm_enable(struct pwm_device *pwm)
+static int s3c_pwm_enable(struct pwm_chip *chip, struct pwm_device *pwm)
{
+ struct s3c_pwm_device *s3c_pwm = to_s3c_pwm_device(chip);
unsigned long flags;
unsigned long tcon;
local_irq_save(flags);
tcon = __raw_readl(S3C2410_TCON);
- tcon |= pwm_tcon_start(pwm);
+ tcon |= pwm_tcon_start(s3c_pwm);
__raw_writel(tcon, S3C2410_TCON);
local_irq_restore(flags);
- pwm->running = 1;
+ s3c_pwm->running = 1;
return 0;
}
-EXPORT_SYMBOL(pwm_enable);
-
-void pwm_disable(struct pwm_device *pwm)
+static void s3c_pwm_disable(struct pwm_chip *chip, struct pwm_device *pwm)
{
+ struct s3c_pwm_device *s3c_pwm = to_s3c_pwm_device(chip);
unsigned long flags;
unsigned long tcon;
local_irq_save(flags);
tcon = __raw_readl(S3C2410_TCON);
- tcon &= ~pwm_tcon_start(pwm);
+ tcon &= ~pwm_tcon_start(s3c_pwm);
__raw_writel(tcon, S3C2410_TCON);
local_irq_restore(flags);
- pwm->running = 0;
+ s3c_pwm->running = 0;
}
-EXPORT_SYMBOL(pwm_disable);
-
-static unsigned long pwm_calc_tin(struct pwm_device *pwm, unsigned long freq)
+static unsigned long pwm_calc_tin(struct s3c_pwm_device *pwm, unsigned long freq)
{
unsigned long tin_parent_rate;
unsigned int div;
@@ -158,8 +110,10 @@ static unsigned long pwm_calc_tin(struct pwm_device *pwm, unsigned long freq)
#define NS_IN_HZ (1000000000UL)
-int pwm_config(struct pwm_device *pwm, int duty_ns, int period_ns)
+static int s3c_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
+ int duty_ns, int period_ns)
{
+ struct s3c_pwm_device *s3c_pwm = to_s3c_pwm_device(chip);
unsigned long tin_rate;
unsigned long tin_ns;
unsigned long period;
@@ -178,38 +132,38 @@ int pwm_config(struct pwm_device *pwm, int duty_ns, int period_ns)
if (duty_ns > period_ns)
return -EINVAL;
- if (period_ns == pwm->period_ns &&
- duty_ns == pwm->duty_ns)
+ if (period_ns == s3c_pwm->period_ns &&
+ duty_ns == s3c_pwm->duty_ns)
return 0;
/* The TCMP and TCNT can be read without a lock, they're not
* shared between the timers. */
- tcmp = __raw_readl(S3C2410_TCMPB(pwm->pwm_id));
- tcnt = __raw_readl(S3C2410_TCNTB(pwm->pwm_id));
+ tcmp = __raw_readl(S3C2410_TCMPB(s3c_pwm->pwm_id));
+ tcnt = __raw_readl(S3C2410_TCNTB(s3c_pwm->pwm_id));
period = NS_IN_HZ / period_ns;
- pwm_dbg(pwm, "duty_ns=%d, period_ns=%d (%lu)\n",
+ pwm_dbg(s3c_pwm, "duty_ns=%d, period_ns=%d (%lu)\n",
duty_ns, period_ns, period);
/* Check to see if we are changing the clock rate of the PWM */
- if (pwm->period_ns != period_ns) {
- if (pwm_is_tdiv(pwm)) {
- tin_rate = pwm_calc_tin(pwm, period);
- clk_set_rate(pwm->clk_div, tin_rate);
+ if (s3c_pwm->period_ns != period_ns) {
+ if (pwm_is_tdiv(s3c_pwm)) {
+ tin_rate = pwm_calc_tin(s3c_pwm, period);
+ clk_set_rate(s3c_pwm->clk_div, tin_rate);
} else
- tin_rate = clk_get_rate(pwm->clk);
+ tin_rate = clk_get_rate(s3c_pwm->clk);
- pwm->period_ns = period_ns;
+ s3c_pwm->period_ns = period_ns;
- pwm_dbg(pwm, "tin_rate=%lu\n", tin_rate);
+ pwm_dbg(s3c_pwm, "tin_rate=%lu\n", tin_rate);
tin_ns = NS_IN_HZ / tin_rate;
tcnt = period_ns / tin_ns;
} else
- tin_ns = NS_IN_HZ / clk_get_rate(pwm->clk);
+ tin_ns = NS_IN_HZ / clk_get_rate(s3c_pwm->clk);
/* Note, counters count down */
@@ -220,7 +174,7 @@ int pwm_config(struct pwm_device *pwm, int duty_ns, int period_ns)
if (tcmp == tcnt)
tcmp--;
- pwm_dbg(pwm, "tin_ns=%lu, tcmp=%ld/%lu\n", tin_ns, tcmp, tcnt);
+ pwm_dbg(s3c_pwm, "tin_ns=%lu, tcmp=%ld/%lu\n", tin_ns, tcmp, tcnt);
if (tcmp < 0)
tcmp = 0;
@@ -229,15 +183,15 @@ int pwm_config(struct pwm_device *pwm, int duty_ns, int period_ns)
local_irq_save(flags);
- __raw_writel(tcmp, S3C2410_TCMPB(pwm->pwm_id));
- __raw_writel(tcnt, S3C2410_TCNTB(pwm->pwm_id));
+ __raw_writel(tcmp, S3C2410_TCMPB(s3c_pwm->pwm_id));
+ __raw_writel(tcnt, S3C2410_TCNTB(s3c_pwm->pwm_id));
tcon = __raw_readl(S3C2410_TCON);
- tcon |= pwm_tcon_manulupdate(pwm);
- tcon |= pwm_tcon_autoreload(pwm);
+ tcon |= pwm_tcon_manulupdate(s3c_pwm);
+ tcon |= pwm_tcon_autoreload(s3c_pwm);
__raw_writel(tcon, S3C2410_TCON);
- tcon &= ~pwm_tcon_manulupdate(pwm);
+ tcon &= ~pwm_tcon_manulupdate(s3c_pwm);
__raw_writel(tcon, S3C2410_TCON);
local_irq_restore(flags);
@@ -245,24 +199,17 @@ int pwm_config(struct pwm_device *pwm, int duty_ns, int period_ns)
return 0;
}
-EXPORT_SYMBOL(pwm_config);
-
-static int pwm_register(struct pwm_device *pwm)
-{
- pwm->duty_ns = -1;
- pwm->period_ns = -1;
-
- mutex_lock(&pwm_lock);
- list_add_tail(&pwm->list, &pwm_list);
- mutex_unlock(&pwm_lock);
-
- return 0;
-}
+static struct pwm_ops s3c_pwm_ops = {
+ .enable = s3c_pwm_enable,
+ .disable = s3c_pwm_disable,
+ .config = s3c_pwm_config,
+ .owner = THIS_MODULE,
+};
static int s3c_pwm_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
- struct pwm_device *pwm;
+ struct s3c_pwm_device *s3c_pwm;
unsigned long flags;
unsigned long tcon;
unsigned int id = pdev->id;
@@ -273,83 +220,83 @@ static int s3c_pwm_probe(struct platform_device *pdev)
return -ENXIO;
}
- pwm = kzalloc(sizeof(struct pwm_device), GFP_KERNEL);
- if (pwm == NULL) {
+ s3c_pwm = kzalloc(sizeof(*s3c_pwm), GFP_KERNEL);
+ if (s3c_pwm == NULL) {
dev_err(dev, "failed to allocate pwm_device\n");
return -ENOMEM;
}
- pwm->pdev = pdev;
- pwm->pwm_id = id;
-
/* calculate base of control bits in TCON */
- pwm->tcon_base = id == 0 ? 0 : (id * 4) + 4;
+ s3c_pwm->tcon_base = id == 0 ? 0 : (id * 4) + 4;
+ s3c_pwm->chip.ops = &s3c_pwm_ops;
- pwm->clk = clk_get(dev, "pwm-tin");
- if (IS_ERR(pwm->clk)) {
+ s3c_pwm->clk = clk_get(dev, "pwm-tin");
+ if (IS_ERR(s3c_pwm->clk)) {
dev_err(dev, "failed to get pwm tin clk\n");
- ret = PTR_ERR(pwm->clk);
+ ret = PTR_ERR(s3c_pwm->clk);
goto err_alloc;
}
- pwm->clk_div = clk_get(dev, "pwm-tdiv");
- if (IS_ERR(pwm->clk_div)) {
+ s3c_pwm->clk_div = clk_get(dev, "pwm-tdiv");
+ if (IS_ERR(s3c_pwm->clk_div)) {
dev_err(dev, "failed to get pwm tdiv clk\n");
- ret = PTR_ERR(pwm->clk_div);
+ ret = PTR_ERR(s3c_pwm->clk_div);
goto err_clk_tin;
}
- clk_enable(pwm->clk);
- clk_enable(pwm->clk_div);
+ clk_enable(s3c_pwm->clk);
+ clk_enable(s3c_pwm->clk_div);
local_irq_save(flags);
tcon = __raw_readl(S3C2410_TCON);
- tcon |= pwm_tcon_invert(pwm);
+ tcon |= pwm_tcon_invert(s3c_pwm);
__raw_writel(tcon, S3C2410_TCON);
local_irq_restore(flags);
- ret = pwm_register(pwm);
+ ret = pwmchip_add(&s3c_pwm->chip);
if (ret) {
dev_err(dev, "failed to register pwm\n");
goto err_clk_tdiv;
}
- pwm_dbg(pwm, "config bits %02x\n",
- (__raw_readl(S3C2410_TCON) >> pwm->tcon_base) & 0x0f);
+ pwm_dbg(s3c_pwm, "config bits %02x\n",
+ (__raw_readl(S3C2410_TCON) >> s3c_pwm->tcon_base) & 0x0f);
dev_info(dev, "tin at %lu, tdiv at %lu, tin=%sclk, base %d\n",
- clk_get_rate(pwm->clk),
- clk_get_rate(pwm->clk_div),
- pwm_is_tdiv(pwm) ? "div" : "ext", pwm->tcon_base);
+ clk_get_rate(s3c_pwm->clk),
+ clk_get_rate(s3c_pwm->clk_div),
+ pwm_is_tdiv(s3c_pwm) ? "div" : "ext", s3c_pwm->tcon_base);
- platform_set_drvdata(pdev, pwm);
+ platform_set_drvdata(pdev, s3c_pwm);
return 0;
err_clk_tdiv:
- clk_disable(pwm->clk_div);
- clk_disable(pwm->clk);
- clk_put(pwm->clk_div);
+ clk_disable(s3c_pwm->clk_div);
+ clk_disable(s3c_pwm->clk);
+ clk_put(s3c_pwm->clk_div);
err_clk_tin:
- clk_put(pwm->clk);
+ clk_put(s3c_pwm->clk);
err_alloc:
- kfree(pwm);
+ kfree(s3c_pwm);
return ret;
}
static int __devexit s3c_pwm_remove(struct platform_device *pdev)
{
- struct pwm_device *pwm = platform_get_drvdata(pdev);
+ struct s3c_pwm_device *s3c_pwm = platform_get_drvdata(pdev);
+
+ pwmchip_remove(&s3c_pwm->chip);
- clk_disable(pwm->clk_div);
- clk_disable(pwm->clk);
- clk_put(pwm->clk_div);
- clk_put(pwm->clk);
- kfree(pwm);
+ clk_disable(s3c_pwm->clk_div);
+ clk_disable(s3c_pwm->clk);
+ clk_put(s3c_pwm->clk_div);
+ clk_put(s3c_pwm->clk);
+ kfree(s3c_pwm);
return 0;
}
@@ -357,26 +304,26 @@ static int __devexit s3c_pwm_remove(struct platform_device *pdev)
#ifdef CONFIG_PM
static int s3c_pwm_suspend(struct platform_device *pdev, pm_message_t state)
{
- struct pwm_device *pwm = platform_get_drvdata(pdev);
+ struct s3c_pwm_device *s3c_pwm = platform_get_drvdata(pdev);
/* No one preserve these values during suspend so reset them
* Otherwise driver leaves PWM unconfigured if same values
* passed to pwm_config
*/
- pwm->period_ns = 0;
- pwm->duty_ns = 0;
+ s3c_pwm->period_ns = 0;
+ s3c_pwm->duty_ns = 0;
return 0;
}
static int s3c_pwm_resume(struct platform_device *pdev)
{
- struct pwm_device *pwm = platform_get_drvdata(pdev);
+ struct s3c_pwm_device *s3c_pwmwm = platform_get_drvdata(pdev);
unsigned long tcon;
/* Restore invertion */
tcon = __raw_readl(S3C2410_TCON);
- tcon |= pwm_tcon_invert(pwm);
+ tcon |= pwm_tcon_invert(s3c_pwmwm);
__raw_writel(tcon, S3C2410_TCON);
return 0;
--
1.7.9.1
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