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ARM vt8500: Move vt8500 pwm driver to pwm framework

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Move the driver to drivers/pwm/ and convert it to use the framework.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Cc: Alexey Charkov <alchark@gmail.com>
Signed-off-by: Thierry Reding <thierry.reding@avionic-design.de>
This commit is contained in:
Sascha Hauer 2012-03-15 10:04:37 +01:00 committed by Thierry Reding
parent 215c29d3d0
commit a245ccebb4
5 changed files with 67 additions and 117 deletions
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1
arch/arm/Kconfig
View file

@ -962,7 +962,6 @@ config ARCH_VT8500
select ARCH_HAS_CPUFREQ
select GENERIC_CLOCKEVENTS
select ARCH_REQUIRE_GPIOLIB
select HAVE_PWM
help
Support for VIA/WonderMedia VT8500/WM85xx System-on-Chip.

2
arch/arm/mach-vt8500/Makefile
View file

@ -5,5 +5,3 @@ obj-$(CONFIG_VTWM_VERSION_WM8505) += devices-wm8505.o
obj-$(CONFIG_MACH_BV07) += bv07.o
obj-$(CONFIG_MACH_WM8505_7IN_NETBOOK) += wm8505_7in.o
obj-$(CONFIG_HAVE_PWM) += pwm.o

9
drivers/pwm/Kconfig
View file

@ -55,4 +55,13 @@ config PWM_TEGRA
To compile this driver as a module, choose M here: the module
will be called pwm-tegra.
config PWM_VT8500
tristate "vt8500 pwm support"
depends on ARCH_VT8500
help
Generic PWM framework driver for vt8500.
To compile this driver as a module, choose M here: the module
will be called pwm-vt8500.
endif

1
drivers/pwm/Makefile
View file

@ -4,3 +4,4 @@ obj-$(CONFIG_PWM_IMX) += pwm-imx.o
obj-$(CONFIG_PWM_PXA) += pwm-pxa.o
obj-$(CONFIG_PWM_SAMSUNG) += pwm-samsung.o
obj-$(CONFIG_PWM_TEGRA) += pwm-tegra.o
obj-$(CONFIG_PWM_VT8500) += pwm-vt8500.o

171
arch/arm/mach-vt8500/pwm.c → drivers/pwm/pwm-vt8500.c
View file

@ -26,21 +26,13 @@
#define VT8500_NR_PWMS 4
static DEFINE_MUTEX(pwm_lock);
static LIST_HEAD(pwm_list);
struct pwm_device {
struct list_head node;
struct platform_device *pdev;
const char *label;
void __iomem *regbase;
unsigned int use_count;
unsigned int pwm_id;
struct vt8500_chip {
struct pwm_chip chip;
void __iomem *base;
};
#define to_vt8500_chip(chip) container_of(chip, struct vt8500_chip, chip)
#define msecs_to_loops(t) (loops_per_jiffy / 1000 * HZ * t)
static inline void pwm_busy_wait(void __iomem *reg, u8 bitmask)
{
@ -53,14 +45,13 @@ static inline void pwm_busy_wait(void __iomem *reg, u8 bitmask)
bitmask);
}
int pwm_config(struct pwm_device *pwm, int duty_ns, int period_ns)
static int vt8500_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
int duty_ns, int period_ns)
{
struct vt8500_chip *vt8500 = to_vt8500_chip(chip);
unsigned long long c;
unsigned long period_cycles, prescale, pv, dc;
if (pwm == NULL || period_ns == 0 || duty_ns > period_ns)
return -EINVAL;
c = 25000000/2; /* wild guess --- need to implement clocks */
c = c * period_ns;
do_div(c, 1000000000);
@ -80,104 +71,58 @@ int pwm_config(struct pwm_device *pwm, int duty_ns, int period_ns)
do_div(c, period_ns);
dc = c;
pwm_busy_wait(pwm->regbase + 0x40 + pwm->pwm_id, (1 << 1));
writel(prescale, pwm->regbase + 0x4 + (pwm->pwm_id << 4));
pwm_busy_wait(vt8500->base + 0x40 + pwm->hwpwm, (1 << 1));
writel(prescale, vt8500->base + 0x4 + (pwm->hwpwm << 4));
pwm_busy_wait(pwm->regbase + 0x40 + pwm->pwm_id, (1 << 2));
writel(pv, pwm->regbase + 0x8 + (pwm->pwm_id << 4));
pwm_busy_wait(vt8500->base + 0x40 + pwm->hwpwm, (1 << 2));
writel(pv, vt8500->base + 0x8 + (pwm->hwpwm << 4));
pwm_busy_wait(pwm->regbase + 0x40 + pwm->pwm_id, (1 << 3));
writel(dc, pwm->regbase + 0xc + (pwm->pwm_id << 4));
pwm_busy_wait(vt8500->base + 0x40 + pwm->hwpwm, (1 << 3));
writel(dc, vt8500->base + 0xc + (pwm->hwpwm << 4));
return 0;
}
EXPORT_SYMBOL(pwm_config);
int pwm_enable(struct pwm_device *pwm)
static int vt8500_pwm_enable(struct pwm_chip *chip, struct pwm_device *pwm)
{
pwm_busy_wait(pwm->regbase + 0x40 + pwm->pwm_id, (1 << 0));
writel(5, pwm->regbase + (pwm->pwm_id << 4));
struct vt8500_chip *vt8500 = to_vt8500_chip(chip);
pwm_busy_wait(vt8500->base + 0x40 + pwm->hwpwm, (1 << 0));
writel(5, vt8500->base + (pwm->hwpwm << 4));
return 0;
}
EXPORT_SYMBOL(pwm_enable);
void pwm_disable(struct pwm_device *pwm)
static void vt8500_pwm_disable(struct pwm_chip *chip, struct pwm_device *pwm)
{
pwm_busy_wait(pwm->regbase + 0x40 + pwm->pwm_id, (1 << 0));
writel(0, pwm->regbase + (pwm->pwm_id << 4));
struct vt8500_chip *vt8500 = to_vt8500_chip(chip);
pwm_busy_wait(vt8500->base + 0x40 + pwm->hwpwm, (1 << 0));
writel(0, vt8500->base + (pwm->hwpwm << 4));
}
EXPORT_SYMBOL(pwm_disable);
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, node) {
if (pwm->pwm_id == pwm_id) {
found = 1;
break;
}
}
if (found) {
if (pwm->use_count == 0) {
pwm->use_count++;
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 {
pr_warning("PWM device already freed\n");
}
mutex_unlock(&pwm_lock);
}
EXPORT_SYMBOL(pwm_free);
static inline void __add_pwm(struct pwm_device *pwm)
{
mutex_lock(&pwm_lock);
list_add_tail(&pwm->node, &pwm_list);
mutex_unlock(&pwm_lock);
}
static struct pwm_ops vt8500_pwm_ops = {
.enable = vt8500_pwm_enable,
.disable = vt8500_pwm_disable,
.config = vt8500_pwm_config,
.owner = THIS_MODULE,
};
static int __devinit pwm_probe(struct platform_device *pdev)
{
struct pwm_device *pwms;
struct vt8500_chip *chip;
struct resource *r;
int ret = 0;
int i;
int ret;
pwms = kzalloc(sizeof(struct pwm_device) * VT8500_NR_PWMS, GFP_KERNEL);
if (pwms == NULL) {
chip = kzalloc(sizeof(*chip), GFP_KERNEL);
if (chip == NULL) {
dev_err(&pdev->dev, "failed to allocate memory\n");
return -ENOMEM;
}
for (i = 0; i < VT8500_NR_PWMS; i++) {
pwms[i].use_count = 0;
pwms[i].pwm_id = i;
pwms[i].pdev = pdev;
}
chip->chip.dev = &pdev->dev;
chip->chip.ops = &vt8500_pwm_ops;
chip->chip.base = -1;
chip->chip.npwm = VT8500_NR_PWMS;
r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (r == NULL) {
@ -193,51 +138,49 @@ static int __devinit pwm_probe(struct platform_device *pdev)
goto err_free;
}
pwms[0].regbase = ioremap(r->start, resource_size(r));
if (pwms[0].regbase == NULL) {
chip->base = ioremap(r->start, resource_size(r));
if (chip->base == NULL) {
dev_err(&pdev->dev, "failed to ioremap() registers\n");
ret = -ENODEV;
goto err_free_mem;
}
for (i = 1; i < VT8500_NR_PWMS; i++)
pwms[i].regbase = pwms[0].regbase;
ret = pwmchip_add(&chip->chip);
if (ret < 0)
goto err_unmap;
for (i = 0; i < VT8500_NR_PWMS; i++)
__add_pwm(&pwms[i]);
platform_set_drvdata(pdev, pwms);
return 0;
platform_set_drvdata(pdev, chip);
return ret;
err_unmap:
iounmap(chip->base);
err_free_mem:
release_mem_region(r->start, resource_size(r));
err_free:
kfree(pwms);
kfree(chip);
return ret;
}
static int __devexit pwm_remove(struct platform_device *pdev)
{
struct pwm_device *pwms;
struct vt8500_chip *chip;
struct resource *r;
int i;
int err;
pwms = platform_get_drvdata(pdev);
if (pwms == NULL)
chip = platform_get_drvdata(pdev);
if (chip == NULL)
return -ENODEV;
mutex_lock(&pwm_lock);
err = pwmchip_remove(&chip->chip);
if (err < 0)
return err;
for (i = 0; i < VT8500_NR_PWMS; i++)
list_del(&pwms[i].node);
mutex_unlock(&pwm_lock);
iounmap(pwms[0].regbase);
iounmap(chip->base);
r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
release_mem_region(r->start, resource_size(r));
kfree(pwms);
kfree(chip);
return 0;
}