forked from luck/tmp_suning_uos_patched
[ARM] S3C24XX: PWM API support.
Add support for PWM in the S3C24XX series of SoC via the PWM API. Signed-off-by: Ben Dooks <ben-linux@fluff.org>
This commit is contained in:
Ben Dooks
parent
d5c52922b6
commit
6fc601e37b
|
|
@ -21,6 +21,13 @@ config CPU_S3C244X
|
|||
help
|
||||
Support for S3C2440 and S3C2442 Samsung Mobile CPU based systems.
|
||||
|
||||
config S3C24XX_PWM
|
||||
bool "PWM device support"
|
||||
select HAVE_PWM
|
||||
help
|
||||
Support for exporting the PWM timer blocks via the pwm device
|
||||
system.
|
||||
|
||||
config PM_SIMTEC
|
||||
bool
|
||||
help
|
||||
|
|
|
|||
|
|
@ -29,5 +29,6 @@ obj-$(CONFIG_CPU_S3C244X) += s3c244x-clock.o
|
|||
obj-$(CONFIG_PM_SIMTEC) += pm-simtec.o
|
||||
obj-$(CONFIG_PM) += pm.o
|
||||
obj-$(CONFIG_PM) += sleep.o
|
||||
obj-$(CONFIG_HAVE_PWM) += pwm.o
|
||||
obj-$(CONFIG_S3C2410_DMA) += dma.o
|
||||
obj-$(CONFIG_MACH_SMDK) += common-smdk.o
|
||||
|
|
|
|||
|
|
@ -495,106 +495,6 @@ struct platform_device s3c_device_spi1 = {
|
|||
|
||||
EXPORT_SYMBOL(s3c_device_spi1);
|
||||
|
||||
/* pwm timer blocks */
|
||||
|
||||
static struct resource s3c_timer0_resource[] = {
|
||||
[0] = {
|
||||
.start = S3C24XX_PA_TIMER + 0x0C,
|
||||
.end = S3C24XX_PA_TIMER + 0x0C + 0xB,
|
||||
.flags = IORESOURCE_MEM,
|
||||
},
|
||||
[1] = {
|
||||
.start = IRQ_TIMER0,
|
||||
.end = IRQ_TIMER0,
|
||||
.flags = IORESOURCE_IRQ,
|
||||
}
|
||||
|
||||
};
|
||||
|
||||
struct platform_device s3c_device_timer0 = {
|
||||
.name = "s3c2410-timer",
|
||||
.id = 0,
|
||||
.num_resources = ARRAY_SIZE(s3c_timer0_resource),
|
||||
.resource = s3c_timer0_resource,
|
||||
};
|
||||
|
||||
EXPORT_SYMBOL(s3c_device_timer0);
|
||||
|
||||
/* timer 1 */
|
||||
|
||||
static struct resource s3c_timer1_resource[] = {
|
||||
[0] = {
|
||||
.start = S3C24XX_PA_TIMER + 0x18,
|
||||
.end = S3C24XX_PA_TIMER + 0x23,
|
||||
.flags = IORESOURCE_MEM,
|
||||
},
|
||||
[1] = {
|
||||
.start = IRQ_TIMER1,
|
||||
.end = IRQ_TIMER1,
|
||||
.flags = IORESOURCE_IRQ,
|
||||
}
|
||||
|
||||
};
|
||||
|
||||
struct platform_device s3c_device_timer1 = {
|
||||
.name = "s3c2410-timer",
|
||||
.id = 1,
|
||||
.num_resources = ARRAY_SIZE(s3c_timer1_resource),
|
||||
.resource = s3c_timer1_resource,
|
||||
};
|
||||
|
||||
EXPORT_SYMBOL(s3c_device_timer1);
|
||||
|
||||
/* timer 2 */
|
||||
|
||||
static struct resource s3c_timer2_resource[] = {
|
||||
[0] = {
|
||||
.start = S3C24XX_PA_TIMER + 0x24,
|
||||
.end = S3C24XX_PA_TIMER + 0x2F,
|
||||
.flags = IORESOURCE_MEM,
|
||||
},
|
||||
[1] = {
|
||||
.start = IRQ_TIMER2,
|
||||
.end = IRQ_TIMER2,
|
||||
.flags = IORESOURCE_IRQ,
|
||||
}
|
||||
|
||||
};
|
||||
|
||||
struct platform_device s3c_device_timer2 = {
|
||||
.name = "s3c2410-timer",
|
||||
.id = 2,
|
||||
.num_resources = ARRAY_SIZE(s3c_timer2_resource),
|
||||
.resource = s3c_timer2_resource,
|
||||
};
|
||||
|
||||
EXPORT_SYMBOL(s3c_device_timer2);
|
||||
|
||||
/* timer 3 */
|
||||
|
||||
static struct resource s3c_timer3_resource[] = {
|
||||
[0] = {
|
||||
.start = S3C24XX_PA_TIMER + 0x30,
|
||||
.end = S3C24XX_PA_TIMER + 0x3B,
|
||||
.flags = IORESOURCE_MEM,
|
||||
},
|
||||
[1] = {
|
||||
.start = IRQ_TIMER3,
|
||||
.end = IRQ_TIMER3,
|
||||
.flags = IORESOURCE_IRQ,
|
||||
}
|
||||
|
||||
};
|
||||
|
||||
struct platform_device s3c_device_timer3 = {
|
||||
.name = "s3c2410-timer",
|
||||
.id = 3,
|
||||
.num_resources = ARRAY_SIZE(s3c_timer3_resource),
|
||||
.resource = s3c_timer3_resource,
|
||||
};
|
||||
|
||||
EXPORT_SYMBOL(s3c_device_timer3);
|
||||
|
||||
#ifdef CONFIG_CPU_S3C2440
|
||||
|
||||
/* Camif Controller */
|
||||
|
|
|
|||
402
arch/arm/plat-s3c24xx/pwm.c
Normal file
402
arch/arm/plat-s3c24xx/pwm.c
Normal file
|
|
@ -0,0 +1,402 @@
|
|||
/* arch/arm/plat-s3c24xx/pwm.c
|
||||
*
|
||||
* Copyright (c) 2007 Ben Dooks
|
||||
* Copyright (c) 2008 Simtec Electronics
|
||||
* Ben Dooks <ben@simtec.co.uk>, <ben-linux@fluff.org>
|
||||
*
|
||||
* S3C24XX PWM device core
|
||||
*
|
||||
* This program is free software; you can redistribute it and/or modify
|
||||
* it under the terms of the GNU General Public License as published by
|
||||
* the Free Software Foundation; either version 2 of the License.
|
||||
*/
|
||||
|
||||
#include <linux/module.h>
|
||||
#include <linux/kernel.h>
|
||||
#include <linux/platform_device.h>
|
||||
#include <linux/err.h>
|
||||
#include <linux/clk.h>
|
||||
#include <linux/io.h>
|
||||
#include <linux/pwm.h>
|
||||
|
||||
#include <asm/plat-s3c/regs-timer.h>
|
||||
|
||||
struct pwm_device {
|
||||
struct list_head list;
|
||||
struct platform_device *pdev;
|
||||
|
||||
struct clk *clk_div;
|
||||
struct clk *clk;
|
||||
const char *label;
|
||||
|
||||
unsigned int period_ns;
|
||||
unsigned int duty_ns;
|
||||
|
||||
unsigned char tcon_base;
|
||||
unsigned char running;
|
||||
unsigned char use_count;
|
||||
unsigned char pwm_id;
|
||||
};
|
||||
|
||||
#define pwm_dbg(_pwm, msg...) dev_info(&(_pwm)->pdev->dev, msg)
|
||||
|
||||
static struct clk *clk_scaler[2];
|
||||
|
||||
/* Standard setup for a timer block. */
|
||||
|
||||
#define TIMER_RESOURCE_SIZE (1)
|
||||
|
||||
#define TIMER_RESOURCE(_tmr, _irq) \
|
||||
(struct resource [TIMER_RESOURCE_SIZE]) { \
|
||||
[0] = { \
|
||||
.start = _irq, \
|
||||
.end = _irq, \
|
||||
.flags = IORESOURCE_IRQ \
|
||||
} \
|
||||
}
|
||||
|
||||
#define DEFINE_TIMER(_tmr_no, _irq) \
|
||||
.name = "s3c24xx-pwm", \
|
||||
.id = _tmr_no, \
|
||||
.num_resources = TIMER_RESOURCE_SIZE, \
|
||||
.resource = TIMER_RESOURCE(_tmr_no, _irq), \
|
||||
|
||||
/* since we already have an static mapping for the timer, we do not
|
||||
* bother setting any IO resource for the base.
|
||||
*/
|
||||
|
||||
struct platform_device s3c_device_timer[] = {
|
||||
[0] = { DEFINE_TIMER(0, IRQ_TIMER0) },
|
||||
[1] = { DEFINE_TIMER(1, IRQ_TIMER1) },
|
||||
[2] = { DEFINE_TIMER(2, IRQ_TIMER2) },
|
||||
[3] = { DEFINE_TIMER(3, IRQ_TIMER3) },
|
||||
[4] = { DEFINE_TIMER(4, IRQ_TIMER4) },
|
||||
};
|
||||
|
||||
static inline int pwm_is_tdiv(struct 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)
|
||||
{
|
||||
unsigned long flags;
|
||||
unsigned long tcon;
|
||||
|
||||
local_irq_save(flags);
|
||||
|
||||
tcon = __raw_readl(S3C2410_TCON);
|
||||
tcon |= pwm_tcon_start(pwm);
|
||||
__raw_writel(tcon, S3C2410_TCON);
|
||||
|
||||
local_irq_restore(flags);
|
||||
|
||||
pwm->running = 1;
|
||||
return 0;
|
||||
}
|
||||
|
||||
EXPORT_SYMBOL(pwm_enable);
|
||||
|
||||
void pwm_disable(struct pwm_device *pwm)
|
||||
{
|
||||
unsigned long flags;
|
||||
unsigned long tcon;
|
||||
|
||||
local_irq_save(flags);
|
||||
|
||||
tcon = __raw_readl(S3C2410_TCON);
|
||||
tcon &= ~pwm_tcon_start(pwm);
|
||||
__raw_writel(tcon, S3C2410_TCON);
|
||||
|
||||
local_irq_restore(flags);
|
||||
|
||||
pwm->running = 0;
|
||||
}
|
||||
|
||||
EXPORT_SYMBOL(pwm_disable);
|
||||
|
||||
unsigned long pwm_calc_tin(struct pwm_device *pwm, unsigned long freq)
|
||||
{
|
||||
unsigned long tin_parent_rate;
|
||||
unsigned int div;
|
||||
|
||||
tin_parent_rate = clk_get_rate(clk_get_parent(pwm->clk_div));
|
||||
pwm_dbg(pwm, "tin parent at %lu\n", tin_parent_rate);
|
||||
|
||||
for (div = 2; div <= 16; div *= 2) {
|
||||
if ((tin_parent_rate / (div << 16)) < freq)
|
||||
return tin_parent_rate / div;
|
||||
}
|
||||
|
||||
return tin_parent_rate / 16;
|
||||
}
|
||||
|
||||
#define NS_IN_HZ (1000000000UL)
|
||||
|
||||
int pwm_config(struct pwm_device *pwm, int duty_ns, int period_ns)
|
||||
{
|
||||
unsigned long tin_rate;
|
||||
unsigned long tin_ns;
|
||||
unsigned long period;
|
||||
unsigned long flags;
|
||||
unsigned long tcon;
|
||||
unsigned long tcnt;
|
||||
long tcmp;
|
||||
|
||||
/* We currently avoid using 64bit arithmetic by using the
|
||||
* fact that anything faster than 1Hz is easily representable
|
||||
* by 32bits. */
|
||||
|
||||
if (period_ns > NS_IN_HZ || duty_ns > NS_IN_HZ)
|
||||
return -ERANGE;
|
||||
|
||||
if (duty_ns > period_ns)
|
||||
return -EINVAL;
|
||||
|
||||
if (period_ns == pwm->period_ns &&
|
||||
duty_ns == 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));
|
||||
|
||||
period = NS_IN_HZ / period_ns;
|
||||
|
||||
pwm_dbg(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);
|
||||
} else
|
||||
tin_rate = clk_get_rate(pwm->clk);
|
||||
|
||||
pwm->period_ns = period_ns;
|
||||
|
||||
pwm_dbg(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);
|
||||
|
||||
/* Note, counters count down */
|
||||
|
||||
tcmp = duty_ns / tin_ns;
|
||||
tcmp = tcnt - tcmp;
|
||||
|
||||
pwm_dbg(pwm, "tin_ns=%lu, tcmp=%ld/%lu\n", tin_ns, tcmp, tcnt);
|
||||
|
||||
if (tcmp < 0)
|
||||
tcmp = 0;
|
||||
|
||||
/* Update the PWM register block. */
|
||||
|
||||
local_irq_save(flags);
|
||||
|
||||
__raw_writel(tcmp, S3C2410_TCMPB(pwm->pwm_id));
|
||||
__raw_writel(tcnt, S3C2410_TCNTB(pwm->pwm_id));
|
||||
|
||||
tcon = __raw_readl(S3C2410_TCON);
|
||||
tcon |= pwm_tcon_manulupdate(pwm);
|
||||
tcon |= pwm_tcon_autoreload(pwm);
|
||||
__raw_writel(tcon, S3C2410_TCON);
|
||||
|
||||
tcon &= ~pwm_tcon_manulupdate(pwm);
|
||||
__raw_writel(tcon, S3C2410_TCON);
|
||||
|
||||
local_irq_restore(flags);
|
||||
|
||||
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 int s3c_pwm_probe(struct platform_device *pdev)
|
||||
{
|
||||
struct device *dev = &pdev->dev;
|
||||
struct pwm_device *pwm;
|
||||
unsigned long flags;
|
||||
unsigned long tcon;
|
||||
unsigned int id = pdev->id;
|
||||
int ret;
|
||||
|
||||
if (id == 4) {
|
||||
dev_err(dev, "TIMER4 is currently not supported\n");
|
||||
return -ENXIO;
|
||||
}
|
||||
|
||||
pwm = kzalloc(sizeof(struct pwm_device), GFP_KERNEL);
|
||||
if (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;
|
||||
|
||||
pwm->clk = clk_get(dev, "pwm-tin");
|
||||
if (IS_ERR(pwm->clk)) {
|
||||
dev_err(dev, "failed to get pwm tin clk\n");
|
||||
ret = PTR_ERR(pwm->clk);
|
||||
goto err_alloc;
|
||||
}
|
||||
|
||||
pwm->clk_div = clk_get(dev, "pwm-tdiv");
|
||||
if (IS_ERR(pwm->clk_div)) {
|
||||
dev_err(dev, "failed to get pwm tdiv clk\n");
|
||||
ret = PTR_ERR(pwm->clk_div);
|
||||
goto err_clk_tin;
|
||||
}
|
||||
|
||||
local_irq_save(flags);
|
||||
|
||||
tcon = __raw_readl(S3C2410_TCON);
|
||||
tcon |= pwm_tcon_invert(pwm);
|
||||
__raw_writel(tcon, S3C2410_TCON);
|
||||
|
||||
local_irq_restore(flags);
|
||||
|
||||
|
||||
ret = pwm_register(pwm);
|
||||
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);
|
||||
|
||||
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);
|
||||
|
||||
platform_set_drvdata(pdev, pwm);
|
||||
return 0;
|
||||
|
||||
err_clk_tdiv:
|
||||
clk_put(pwm->clk_div);
|
||||
|
||||
err_clk_tin:
|
||||
clk_put(pwm->clk);
|
||||
|
||||
err_alloc:
|
||||
kfree(pwm);
|
||||
return ret;
|
||||
}
|
||||
|
||||
static int s3c_pwm_remove(struct platform_device *pdev)
|
||||
{
|
||||
struct pwm_device *pwm = platform_get_drvdata(pdev);
|
||||
|
||||
clk_put(pwm->clk_div);
|
||||
clk_put(pwm->clk);
|
||||
kfree(pwm);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static struct platform_driver s3c_pwm_driver = {
|
||||
.driver = {
|
||||
.name = "s3c24xx-pwm",
|
||||
.owner = THIS_MODULE,
|
||||
},
|
||||
.probe = s3c_pwm_probe,
|
||||
.remove = __devexit_p(s3c_pwm_remove),
|
||||
};
|
||||
|
||||
static int __init pwm_init(void)
|
||||
{
|
||||
int ret;
|
||||
|
||||
clk_scaler[0] = clk_get(NULL, "pwm-scaler0");
|
||||
clk_scaler[1] = clk_get(NULL, "pwm-scaler1");
|
||||
|
||||
if (IS_ERR(clk_scaler[0]) || IS_ERR(clk_scaler[1])) {
|
||||
printk(KERN_ERR "%s: failed to get scaler clocks\n", __func__);
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
ret = platform_driver_register(&s3c_pwm_driver);
|
||||
if (ret)
|
||||
printk(KERN_ERR "%s: failed to add pwm driver\n", __func__);
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
arch_initcall(pwm_init);
|
||||
|
|
@ -21,6 +21,8 @@ extern struct s3c24xx_uart_resources s3c2410_uart_resources[];
|
|||
extern struct platform_device *s3c24xx_uart_devs[];
|
||||
extern struct platform_device *s3c24xx_uart_src[];
|
||||
|
||||
extern struct platform_device s3c_device_timer[];
|
||||
|
||||
extern struct platform_device s3c_device_usb;
|
||||
extern struct platform_device s3c_device_lcd;
|
||||
extern struct platform_device s3c_device_wdt;
|
||||
|
|
@ -36,11 +38,6 @@ extern struct platform_device s3c_device_spi1;
|
|||
|
||||
extern struct platform_device s3c_device_nand;
|
||||
|
||||
extern struct platform_device s3c_device_timer0;
|
||||
extern struct platform_device s3c_device_timer1;
|
||||
extern struct platform_device s3c_device_timer2;
|
||||
extern struct platform_device s3c_device_timer3;
|
||||
|
||||
extern struct platform_device s3c_device_usbgadget;
|
||||
|
||||
/* s3c2440 specific devices */
|
||||
|
|
|
|||
Loading…
Reference in New Issue
Block a user