mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-11-24 12:00:58 +07:00
pwm: Move PXA PWM driver to PWM framework
This commit moves the PXA PWM driver to the drivers/pwm subdirectory and converts it to use the new PWM framework. Signed-off-by: Thierry Reding <thierry.reding@avionic-design.de>
This commit is contained in:
Thierry Reding
parent
a4315e3c11
commit
17b2b4780f
@ -8,5 +8,4 @@ obj-$(CONFIG_PXA3xx) += mfp.o
|
||||
obj-$(CONFIG_PXA95x) += mfp.o
|
||||
obj-$(CONFIG_ARCH_MMP) += mfp.o
|
||||
|
||||
obj-$(CONFIG_HAVE_PWM) += pwm.o
|
||||
obj-$(CONFIG_PXA_SSP) += ssp.o
|
||||
|
||||
@ -18,6 +18,15 @@ config PWM_BFIN
|
||||
To compile this driver as a module, choose M here: the module
|
||||
will be called pwm-bfin.
|
||||
|
||||
config PWM_PXA
|
||||
tristate "PXA PWM support"
|
||||
depends on ARCH_PXA
|
||||
help
|
||||
Generic PWM framework driver for PXA.
|
||||
|
||||
To compile this driver as a module, choose M here: the module
|
||||
will be called pwm-pxa.
|
||||
|
||||
config PWM_TEGRA
|
||||
tristate "NVIDIA Tegra PWM support"
|
||||
depends on ARCH_TEGRA
|
||||
|
||||
@ -1,3 +1,4 @@
|
||||
obj-$(CONFIG_PWM) += core.o
|
||||
obj-$(CONFIG_PWM_BFIN) += pwm-bfin.o
|
||||
obj-$(CONFIG_PWM_PXA) += pwm-pxa.o
|
||||
obj-$(CONFIG_PWM_TEGRA) += pwm-tegra.o
|
||||
|
||||
@ -43,33 +43,39 @@ MODULE_DEVICE_TABLE(platform, pwm_id_table);
|
||||
#define PWMCR_SD (1 << 6)
|
||||
#define PWMDCR_FD (1 << 10)
|
||||
|
||||
struct pwm_device {
|
||||
struct list_head node;
|
||||
struct pwm_device *secondary;
|
||||
struct platform_device *pdev;
|
||||
struct pxa_pwm_chip {
|
||||
struct pwm_chip chip;
|
||||
struct device *dev;
|
||||
|
||||
const char *label;
|
||||
struct clk *clk;
|
||||
int clk_enabled;
|
||||
void __iomem *mmio_base;
|
||||
|
||||
unsigned int use_count;
|
||||
unsigned int pwm_id;
|
||||
};
|
||||
|
||||
static inline struct pxa_pwm_chip *to_pxa_pwm_chip(struct pwm_chip *chip)
|
||||
{
|
||||
return container_of(chip, struct pxa_pwm_chip, chip);
|
||||
}
|
||||
|
||||
/*
|
||||
* period_ns = 10^9 * (PRESCALE + 1) * (PV + 1) / PWM_CLK_RATE
|
||||
* duty_ns = 10^9 * (PRESCALE + 1) * DC / PWM_CLK_RATE
|
||||
*/
|
||||
int pwm_config(struct pwm_device *pwm, int duty_ns, int period_ns)
|
||||
static int pxa_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
|
||||
int duty_ns, int period_ns)
|
||||
{
|
||||
struct pxa_pwm_chip *pc = to_pxa_pwm_chip(chip);
|
||||
unsigned long long c;
|
||||
unsigned long period_cycles, prescale, pv, dc;
|
||||
unsigned long offset;
|
||||
int rc;
|
||||
|
||||
if (pwm == NULL || period_ns == 0 || duty_ns > period_ns)
|
||||
if (period_ns == 0 || duty_ns > period_ns)
|
||||
return -EINVAL;
|
||||
|
||||
c = clk_get_rate(pwm->clk);
|
||||
offset = pwm->hwpwm ? 0x10 : 0;
|
||||
|
||||
c = clk_get_rate(pc->clk);
|
||||
c = c * period_ns;
|
||||
do_div(c, 1000000000);
|
||||
period_cycles = c;
|
||||
@ -90,98 +96,56 @@ int pwm_config(struct pwm_device *pwm, int duty_ns, int period_ns)
|
||||
/* NOTE: the clock to PWM has to be enabled first
|
||||
* before writing to the registers
|
||||
*/
|
||||
clk_enable(pwm->clk);
|
||||
__raw_writel(prescale, pwm->mmio_base + PWMCR);
|
||||
__raw_writel(dc, pwm->mmio_base + PWMDCR);
|
||||
__raw_writel(pv, pwm->mmio_base + PWMPCR);
|
||||
clk_disable(pwm->clk);
|
||||
rc = clk_prepare_enable(pc->clk);
|
||||
if (rc < 0)
|
||||
return rc;
|
||||
|
||||
writel(prescale, pc->mmio_base + offset + PWMCR);
|
||||
writel(dc, pc->mmio_base + offset + PWMDCR);
|
||||
writel(pv, pc->mmio_base + offset + PWMPCR);
|
||||
|
||||
clk_disable_unprepare(pc->clk);
|
||||
return 0;
|
||||
}
|
||||
EXPORT_SYMBOL(pwm_config);
|
||||
|
||||
int pwm_enable(struct pwm_device *pwm)
|
||||
static int pxa_pwm_enable(struct pwm_chip *chip, struct pwm_device *pwm)
|
||||
{
|
||||
struct pxa_pwm_chip *pc = to_pxa_pwm_chip(chip);
|
||||
int rc = 0;
|
||||
|
||||
if (!pwm->clk_enabled) {
|
||||
rc = clk_enable(pwm->clk);
|
||||
if (!pc->clk_enabled) {
|
||||
rc = clk_prepare_enable(pc->clk);
|
||||
if (!rc)
|
||||
pwm->clk_enabled = 1;
|
||||
pc->clk_enabled++;
|
||||
}
|
||||
return rc;
|
||||
}
|
||||
EXPORT_SYMBOL(pwm_enable);
|
||||
|
||||
void pwm_disable(struct pwm_device *pwm)
|
||||
static void pxa_pwm_disable(struct pwm_chip *chip, struct pwm_device *pwm)
|
||||
{
|
||||
if (pwm->clk_enabled) {
|
||||
clk_disable(pwm->clk);
|
||||
pwm->clk_enabled = 0;
|
||||
struct pxa_pwm_chip *pc = to_pxa_pwm_chip(chip);
|
||||
|
||||
if (pc->clk_enabled) {
|
||||
clk_disable_unprepare(pc->clk);
|
||||
pc->clk_enabled--;
|
||||
}
|
||||
}
|
||||
EXPORT_SYMBOL(pwm_disable);
|
||||
|
||||
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, 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 pxa_pwm_ops = {
|
||||
.config = pxa_pwm_config,
|
||||
.enable = pxa_pwm_enable,
|
||||
.disable = pxa_pwm_disable,
|
||||
.owner = THIS_MODULE,
|
||||
};
|
||||
|
||||
static int __devinit pwm_probe(struct platform_device *pdev)
|
||||
{
|
||||
const struct platform_device_id *id = platform_get_device_id(pdev);
|
||||
struct pwm_device *pwm, *secondary = NULL;
|
||||
struct pxa_pwm_chip *pwm;
|
||||
struct resource *r;
|
||||
int ret = 0;
|
||||
|
||||
pwm = kzalloc(sizeof(struct pwm_device), GFP_KERNEL);
|
||||
pwm = kzalloc(sizeof(*pwm), GFP_KERNEL);
|
||||
if (pwm == NULL) {
|
||||
dev_err(&pdev->dev, "failed to allocate memory\n");
|
||||
return -ENOMEM;
|
||||
@ -194,9 +158,10 @@ static int __devinit pwm_probe(struct platform_device *pdev)
|
||||
}
|
||||
pwm->clk_enabled = 0;
|
||||
|
||||
pwm->use_count = 0;
|
||||
pwm->pwm_id = PWM_ID_BASE(id->driver_data) + pdev->id;
|
||||
pwm->pdev = pdev;
|
||||
pwm->chip.dev = &pdev->dev;
|
||||
pwm->chip.ops = &pxa_pwm_ops;
|
||||
pwm->chip.base = -1;
|
||||
pwm->chip.npwm = (id->driver_data & HAS_SECONDARY_PWM) ? 2 : 1;
|
||||
|
||||
r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
||||
if (r == NULL) {
|
||||
@ -219,25 +184,12 @@ static int __devinit pwm_probe(struct platform_device *pdev)
|
||||
goto err_free_mem;
|
||||
}
|
||||
|
||||
if (id->driver_data & HAS_SECONDARY_PWM) {
|
||||
secondary = kzalloc(sizeof(struct pwm_device), GFP_KERNEL);
|
||||
if (secondary == NULL) {
|
||||
ret = -ENOMEM;
|
||||
goto err_free_mem;
|
||||
}
|
||||
|
||||
*secondary = *pwm;
|
||||
pwm->secondary = secondary;
|
||||
|
||||
/* registers for the second PWM has offset of 0x10 */
|
||||
secondary->mmio_base = pwm->mmio_base + 0x10;
|
||||
secondary->pwm_id = pdev->id + 2;
|
||||
ret = pwmchip_add(&pwm->chip);
|
||||
if (ret < 0) {
|
||||
dev_err(&pdev->dev, "pwmchip_add() failed: %d\n", ret);
|
||||
return ret;
|
||||
}
|
||||
|
||||
__add_pwm(pwm);
|
||||
if (secondary)
|
||||
__add_pwm(secondary);
|
||||
|
||||
platform_set_drvdata(pdev, pwm);
|
||||
return 0;
|
||||
|
||||
@ -252,30 +204,22 @@ static int __devinit pwm_probe(struct platform_device *pdev)
|
||||
|
||||
static int __devexit pwm_remove(struct platform_device *pdev)
|
||||
{
|
||||
struct pwm_device *pwm;
|
||||
struct pxa_pwm_chip *chip;
|
||||
struct resource *r;
|
||||
|
||||
pwm = platform_get_drvdata(pdev);
|
||||
if (pwm == NULL)
|
||||
chip = platform_get_drvdata(pdev);
|
||||
if (chip == NULL)
|
||||
return -ENODEV;
|
||||
|
||||
mutex_lock(&pwm_lock);
|
||||
pwmchip_remove(&chip->chip);
|
||||
|
||||
if (pwm->secondary) {
|
||||
list_del(&pwm->secondary->node);
|
||||
kfree(pwm->secondary);
|
||||
}
|
||||
|
||||
list_del(&pwm->node);
|
||||
mutex_unlock(&pwm_lock);
|
||||
|
||||
iounmap(pwm->mmio_base);
|
||||
iounmap(chip->mmio_base);
|
||||
|
||||
r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
||||
release_mem_region(r->start, resource_size(r));
|
||||
|
||||
clk_put(pwm->clk);
|
||||
kfree(pwm);
|
||||
clk_put(chip->clk);
|
||||
kfree(chip);
|
||||
return 0;
|
||||
}
|
||||
|
||||
Loading…
Reference in New Issue
Block a user