Commit f6b8a570 authored by Thierry Reding's avatar Thierry Reding

pwm: Add Ingenic JZ4740 support

This commit moves the driver to drivers/pwm and converts it to the new
PWM framework.
Signed-off-by: default avatarThierry Reding <thierry.reding@avionic-design.de>
Acked-by: default avatarLars-Peter Clausen <lars@metafoo.de>
Tested-by: default avatarLars-Peter Clausen <lars@metafoo.de>
Acked-by: default avatarRalf Baechle <ralf@linux-mips.org>
parent 46a98765
......@@ -31,6 +31,7 @@ extern struct platform_device jz4740_pcm_device;
extern struct platform_device jz4740_codec_device;
extern struct platform_device jz4740_adc_device;
extern struct platform_device jz4740_wdt_device;
extern struct platform_device jz4740_pwm_device;
void jz4740_serial_device_register(void);
......
......@@ -7,6 +7,3 @@ config JZ4740_QI_LB60
bool "Qi Hardware Ben NanoNote"
endchoice
config HAVE_PWM
bool
......@@ -5,7 +5,7 @@
# Object file lists.
obj-y += prom.o irq.o time.o reset.o setup.o dma.o \
gpio.o clock.o platform.o timer.o pwm.o serial.o
gpio.o clock.o platform.o timer.o serial.o
obj-$(CONFIG_DEBUG_FS) += clock-debugfs.o
......
......@@ -437,6 +437,7 @@ static struct platform_device *jz_platform_devices[] __initdata = {
&jz4740_codec_device,
&jz4740_rtc_device,
&jz4740_adc_device,
&jz4740_pwm_device,
&qi_lb60_gpio_keys,
&qi_lb60_pwm_beeper,
&qi_lb60_charger_device,
......
......@@ -323,3 +323,9 @@ struct platform_device jz4740_wdt_device = {
.num_resources = ARRAY_SIZE(jz4740_wdt_resources),
.resource = jz4740_wdt_resources,
};
/* PWM */
struct platform_device jz4740_pwm_device = {
.name = "jz4740-pwm",
.id = -1,
};
/*
* Copyright (C) 2010, Lars-Peter Clausen <lars@metafoo.de>
* JZ4740 platform PWM support
*
* 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, or (at your
* option) any later version.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 675 Mass Ave, Cambridge, MA 02139, USA.
*
*/
#include <linux/kernel.h>
#include <linux/clk.h>
#include <linux/err.h>
#include <linux/pwm.h>
#include <linux/gpio.h>
#include <asm/mach-jz4740/gpio.h>
#include "timer.h"
static struct clk *jz4740_pwm_clk;
DEFINE_MUTEX(jz4740_pwm_mutex);
struct pwm_device {
unsigned int id;
unsigned int gpio;
bool used;
};
static struct pwm_device jz4740_pwm_list[] = {
{ 2, JZ_GPIO_PWM2, false },
{ 3, JZ_GPIO_PWM3, false },
{ 4, JZ_GPIO_PWM4, false },
{ 5, JZ_GPIO_PWM5, false },
{ 6, JZ_GPIO_PWM6, false },
{ 7, JZ_GPIO_PWM7, false },
};
struct pwm_device *pwm_request(int id, const char *label)
{
int ret = 0;
struct pwm_device *pwm;
if (id < 2 || id > 7 || !jz4740_pwm_clk)
return ERR_PTR(-ENODEV);
mutex_lock(&jz4740_pwm_mutex);
pwm = &jz4740_pwm_list[id - 2];
if (pwm->used)
ret = -EBUSY;
else
pwm->used = true;
mutex_unlock(&jz4740_pwm_mutex);
if (ret)
return ERR_PTR(ret);
ret = gpio_request(pwm->gpio, label);
if (ret) {
printk(KERN_ERR "Failed to request pwm gpio: %d\n", ret);
pwm->used = false;
return ERR_PTR(ret);
}
jz_gpio_set_function(pwm->gpio, JZ_GPIO_FUNC_PWM);
jz4740_timer_start(id);
return pwm;
}
void pwm_free(struct pwm_device *pwm)
{
pwm_disable(pwm);
jz4740_timer_set_ctrl(pwm->id, 0);
jz_gpio_set_function(pwm->gpio, JZ_GPIO_FUNC_NONE);
gpio_free(pwm->gpio);
jz4740_timer_stop(pwm->id);
pwm->used = false;
}
int pwm_config(struct pwm_device *pwm, int duty_ns, int period_ns)
{
unsigned long long tmp;
unsigned long period, duty;
unsigned int prescaler = 0;
unsigned int id = pwm->id;
uint16_t ctrl;
bool is_enabled;
if (duty_ns < 0 || duty_ns > period_ns)
return -EINVAL;
tmp = (unsigned long long)clk_get_rate(jz4740_pwm_clk) * period_ns;
do_div(tmp, 1000000000);
period = tmp;
while (period > 0xffff && prescaler < 6) {
period >>= 2;
++prescaler;
}
if (prescaler == 6)
return -EINVAL;
tmp = (unsigned long long)period * duty_ns;
do_div(tmp, period_ns);
duty = period - tmp;
if (duty >= period)
duty = period - 1;
is_enabled = jz4740_timer_is_enabled(id);
if (is_enabled)
pwm_disable(pwm);
jz4740_timer_set_count(id, 0);
jz4740_timer_set_duty(id, duty);
jz4740_timer_set_period(id, period);
ctrl = JZ_TIMER_CTRL_PRESCALER(prescaler) | JZ_TIMER_CTRL_SRC_EXT |
JZ_TIMER_CTRL_PWM_ABBRUPT_SHUTDOWN;
jz4740_timer_set_ctrl(id, ctrl);
if (is_enabled)
pwm_enable(pwm);
return 0;
}
int pwm_enable(struct pwm_device *pwm)
{
uint32_t ctrl = jz4740_timer_get_ctrl(pwm->id);
ctrl |= JZ_TIMER_CTRL_PWM_ENABLE;
jz4740_timer_set_ctrl(pwm->id, ctrl);
jz4740_timer_enable(pwm->id);
return 0;
}
void pwm_disable(struct pwm_device *pwm)
{
uint32_t ctrl = jz4740_timer_get_ctrl(pwm->id);
ctrl &= ~JZ_TIMER_CTRL_PWM_ENABLE;
jz4740_timer_disable(pwm->id);
jz4740_timer_set_ctrl(pwm->id, ctrl);
}
static int __init jz4740_pwm_init(void)
{
int ret = 0;
jz4740_pwm_clk = clk_get(NULL, "ext");
if (IS_ERR(jz4740_pwm_clk)) {
ret = PTR_ERR(jz4740_pwm_clk);
jz4740_pwm_clk = NULL;
}
return ret;
}
subsys_initcall(jz4740_pwm_init);
menuconfig PWM
bool "Pulse-Width Modulation (PWM) Support"
depends on !MACH_JZ4740
help
Generic Pulse-Width Modulation (PWM) support.
......@@ -56,6 +55,16 @@ config PWM_IMX
To compile this driver as a module, choose M here: the module
will be called pwm-imx.
config PWM_JZ4740
tristate "Ingenic JZ4740 PWM support"
depends on MACH_JZ4740
help
Generic PWM framework driver for Ingenic JZ4740 based
machines.
To compile this driver as a module, choose M here: the module
will be called pwm-jz4740.
config PWM_LPC32XX
tristate "LPC32XX PWM support"
depends on ARCH_LPC32XX
......
......@@ -2,6 +2,7 @@ obj-$(CONFIG_PWM) += core.o
obj-$(CONFIG_PWM_AB8500) += pwm-ab8500.o
obj-$(CONFIG_PWM_BFIN) += pwm-bfin.o
obj-$(CONFIG_PWM_IMX) += pwm-imx.o
obj-$(CONFIG_PWM_JZ4740) += pwm-jz4740.o
obj-$(CONFIG_PWM_LPC32XX) += pwm-lpc32xx.o
obj-$(CONFIG_PWM_MXS) += pwm-mxs.o
obj-$(CONFIG_PWM_PUV3) += pwm-puv3.o
......
/*
* Copyright (C) 2010, Lars-Peter Clausen <lars@metafoo.de>
* JZ4740 platform PWM support
*
* 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, or (at your
* option) any later version.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 675 Mass Ave, Cambridge, MA 02139, USA.
*
*/
#include <linux/clk.h>
#include <linux/err.h>
#include <linux/gpio.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/pwm.h>
#include <asm/mach-jz4740/gpio.h>
#include <asm/mach-jz4740/timer.h>
#define NUM_PWM 8
static const unsigned int jz4740_pwm_gpio_list[NUM_PWM] = {
JZ_GPIO_PWM0,
JZ_GPIO_PWM1,
JZ_GPIO_PWM2,
JZ_GPIO_PWM3,
JZ_GPIO_PWM4,
JZ_GPIO_PWM5,
JZ_GPIO_PWM6,
JZ_GPIO_PWM7,
};
struct jz4740_pwm_chip {
struct pwm_chip chip;
struct clk *clk;
};
static inline struct jz4740_pwm_chip *to_jz4740(struct pwm_chip *chip)
{
return container_of(chip, struct jz4740_pwm_chip, chip);
}
static int jz4740_pwm_request(struct pwm_chip *chip, struct pwm_device *pwm)
{
unsigned int gpio = jz4740_pwm_gpio_list[pwm->hwpwm];
int ret;
/*
* Timers 0 and 1 are used for system tasks, so they are unavailable
* for use as PWMs.
*/
if (pwm->hwpwm < 2)
return -EBUSY;
ret = gpio_request(gpio, pwm->label);
if (ret) {
dev_err(chip->dev, "Failed to request GPIO#%u for PWM: %d\n",
gpio, ret);
return ret;
}
jz_gpio_set_function(gpio, JZ_GPIO_FUNC_PWM);
jz4740_timer_start(pwm->hwpwm);
return 0;
}
static void jz4740_pwm_free(struct pwm_chip *chip, struct pwm_device *pwm)
{
unsigned int gpio = jz4740_pwm_gpio_list[pwm->hwpwm];
jz4740_timer_set_ctrl(pwm->hwpwm, 0);
jz_gpio_set_function(gpio, JZ_GPIO_FUNC_NONE);
gpio_free(gpio);
jz4740_timer_stop(pwm->hwpwm);
}
static int jz4740_pwm_enable(struct pwm_chip *chip, struct pwm_device *pwm)
{
uint32_t ctrl = jz4740_timer_get_ctrl(pwm->pwm);
ctrl |= JZ_TIMER_CTRL_PWM_ENABLE;
jz4740_timer_set_ctrl(pwm->hwpwm, ctrl);
jz4740_timer_enable(pwm->hwpwm);
return 0;
}
static void jz4740_pwm_disable(struct pwm_chip *chip, struct pwm_device *pwm)
{
uint32_t ctrl = jz4740_timer_get_ctrl(pwm->hwpwm);
ctrl &= ~JZ_TIMER_CTRL_PWM_ENABLE;
jz4740_timer_disable(pwm->hwpwm);
jz4740_timer_set_ctrl(pwm->hwpwm, ctrl);
}
static int jz4740_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
int duty_ns, int period_ns)
{
struct jz4740_pwm_chip *jz4740 = to_jz4740(pwm->chip);
unsigned long long tmp;
unsigned long period, duty;
unsigned int prescaler = 0;
uint16_t ctrl;
bool is_enabled;
tmp = (unsigned long long)clk_get_rate(jz4740->clk) * period_ns;
do_div(tmp, 1000000000);
period = tmp;
while (period > 0xffff && prescaler < 6) {
period >>= 2;
++prescaler;
}
if (prescaler == 6)
return -EINVAL;
tmp = (unsigned long long)period * duty_ns;
do_div(tmp, period_ns);
duty = period - tmp;
if (duty >= period)
duty = period - 1;
is_enabled = jz4740_timer_is_enabled(pwm->hwpwm);
if (is_enabled)
jz4740_pwm_disable(chip, pwm);
jz4740_timer_set_count(pwm->hwpwm, 0);
jz4740_timer_set_duty(pwm->hwpwm, duty);
jz4740_timer_set_period(pwm->hwpwm, period);
ctrl = JZ_TIMER_CTRL_PRESCALER(prescaler) | JZ_TIMER_CTRL_SRC_EXT |
JZ_TIMER_CTRL_PWM_ABBRUPT_SHUTDOWN;
jz4740_timer_set_ctrl(pwm->hwpwm, ctrl);
if (is_enabled)
jz4740_pwm_enable(chip, pwm);
return 0;
}
static const struct pwm_ops jz4740_pwm_ops = {
.request = jz4740_pwm_request,
.free = jz4740_pwm_free,
.config = jz4740_pwm_config,
.enable = jz4740_pwm_enable,
.disable = jz4740_pwm_disable,
.owner = THIS_MODULE,
};
static int __devinit jz4740_pwm_probe(struct platform_device *pdev)
{
struct jz4740_pwm_chip *jz4740;
int ret;
jz4740 = devm_kzalloc(&pdev->dev, sizeof(*jz4740), GFP_KERNEL);
if (!jz4740)
return -ENOMEM;
jz4740->clk = clk_get(NULL, "ext");
if (IS_ERR(jz4740->clk))
return PTR_ERR(jz4740->clk);
jz4740->chip.dev = &pdev->dev;
jz4740->chip.ops = &jz4740_pwm_ops;
jz4740->chip.npwm = NUM_PWM;
jz4740->chip.base = -1;
ret = pwmchip_add(&jz4740->chip);
if (ret < 0) {
clk_put(jz4740->clk);
return ret;
}
platform_set_drvdata(pdev, jz4740);
return 0;
}
static int __devexit jz4740_pwm_remove(struct platform_device *pdev)
{
struct jz4740_pwm_chip *jz4740 = platform_get_drvdata(pdev);
int ret;
ret = pwmchip_remove(&jz4740->chip);
if (ret < 0)
return ret;
clk_put(jz4740->clk);
return 0;
}
static struct platform_driver jz4740_pwm_driver = {
.driver = {
.name = "jz4740-pwm",
.owner = THIS_MODULE,
},
.probe = jz4740_pwm_probe,
.remove = __devexit_p(jz4740_pwm_remove),
};
module_platform_driver(jz4740_pwm_driver);
MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
MODULE_DESCRIPTION("Ingenic JZ4740 PWM driver");
MODULE_ALIAS("platform:jz4740-pwm");
MODULE_LICENSE("GPL");
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