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pwm: Changes for v3.7-rc1 

All legacy PWM providers have now been moved to the PWM subsystem. The
 plan for 3.8 is to adapt all board files to provide a lookup table for
 PWM devices in order to get rid of the global namespace. Subsequently,
 users of the legacy pwm_request() and pwm_free() functions can be
 migrated to the new pwm_get() and pwm_put() functions. Once this has
 been completed, the legacy API and the compatibility code in the core
 can be removed.
 
 In addition to the above, these changes also add support for configuring
 the polarity of a PWM signal (currently only supported on ECAP and
 EHRPWM) and include a much needed rework of the i.MX driver. Managed
 functions to obtain and release a PWM device (devm_pwm_get() and
 devm_pwm_put()) have been added and the pwm-backlight driver has been
 updated to use them. If the PWM subsystem hasn't been enabled, dummy
 functions are provided that allow the subsystem to safely compile out.
 
 Some common checks on input parameters have been moved to the core and
 removed from the drivers. Finally, a small fix corrects the description
 of the PWM specifier's second cell in the device tree representation.
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Merge tag 'for-3.7-rc1' of git://gitorious.org/linux-pwm/linux-pwm

Pull pwm changes from Thierry Reding:
 "All legacy PWM providers have now been moved to the PWM subsystem.
  The plan for 3.8 is to adapt all board files to provide a lookup table
  for PWM devices in order to get rid of the global namespace.
  Subsequently, users of the legacy pwm_request() and pwm_free()
  functions can be migrated to the new pwm_get() and pwm_put()
  functions.  Once this has been completed, the legacy API and the
  compatibility code in the core can be removed.

  In addition to the above, these changes also add support for
  configuring the polarity of a PWM signal (currently only supported on
  ECAP and EHRPWM) and include a much needed rework of the i.MX driver.
  Managed functions to obtain and release a PWM device (devm_pwm_get()
  and devm_pwm_put()) have been added and the pwm-backlight driver has
  been updated to use them.  If the PWM subsystem hasn't been enabled,
  dummy functions are provided that allow the subsystem to safely
  compile out.

  Some common checks on input parameters have been moved to the core and
  removed from the drivers.  Finally, a small fix corrects the
  description of the PWM specifier's second cell in the device tree
  representation."

* tag 'for-3.7-rc1' of git://gitorious.org/linux-pwm/linux-pwm: (23 commits)
  pwm: dt: Fix description of second PWM cell
  pwm: Check for negative duty-cycle and period
  pwm: Add Ingenic JZ4740 support
  MIPS: JZ4740: Export timer API
  pwm: Move PUV3 PWM driver to PWM framework
  unicore32: pwm: Use managed resource allocations
  unicore32: pwm: Remove unnecessary indirection
  unicore32: pwm: Use module_platform_driver()
  unicore32: pwm: Properly remap memory-mapped registers
  pwm-backlight: Use devm_pwm_get() instead of pwm_get()
  pwm: Move AB8500 PWM driver to PWM framework
  pwm: Fix compilation error when CONFIG_PWM is not defined
  pwm: i.MX: fix clock lookup
  pwm: i.MX: use per clock unconditionally
  pwm: i.MX: add devicetree support
  pwm: i.MX: Use module_platform_driver
  pwm: i.MX: add functions to enable/disable pwm.
  pwm: i.MX: remove unnecessary if in pwm_[en|dis]able
  pwm: i.MX: factor out SoC specific functions
  pwm: pwm-tiehrpwm: Add support for configuring polarity of PWM
  ...
This commit is contained in:
Linus Torvalds 2012-10-10 20:15:24 +09:00
parent c7a6ced9d8 85f8879ca4
commit 2474542f64
35 changed files with 1067 additions and 820 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

17
Documentation/devicetree/bindings/pwm/imx-pwm.txt Normal file
View File

@ -0,0 +1,17 @@
Freescale i.MX PWM controller
Required properties:
- compatible: should be "fsl,<soc>-pwm"
- reg: physical base address and length of the controller's registers
- #pwm-cells: should be 2. The first cell specifies the per-chip index
of the PWM to use and the second cell is the period in nanoseconds.
- interrupts: The interrupt for the pwm controller
Example:
pwm1: pwm@53fb4000 {
#pwm-cells = <2>;
compatible = "fsl,imx53-pwm", "fsl,imx27-pwm";
reg = <0x53fb4000 0x4000>;
interrupts = <61>;
};

2
Documentation/devicetree/bindings/pwm/mxs-pwm.txt
View File

@ -4,7 +4,7 @@ Required properties:
- compatible: should be "fsl,imx23-pwm"
- reg: physical base address and length of the controller's registers
- #pwm-cells: should be 2. The first cell specifies the per-chip index
of the PWM to use and the second cell is the duty cycle in nanoseconds.
of the PWM to use and the second cell is the period in nanoseconds.
- fsl,pwm-number: the number of PWM devices
Example:

2
Documentation/devicetree/bindings/pwm/nvidia,tegra20-pwm.txt
View File

@ -7,7 +7,7 @@ Required properties:
- reg: physical base address and length of the controller's registers
- #pwm-cells: On Tegra the number of cells used to specify a PWM is 2. The
first cell specifies the per-chip index of the PWM to use and the second
cell is the duty cycle in nanoseconds.
cell is the period in nanoseconds.
Example:

4
Documentation/driver-model/devres.txt
View File

@ -284,3 +284,7 @@ CLOCK
PINCTRL
devm_pinctrl_get()
devm_pinctrl_put()
PWM
devm_pwm_get()
devm_pwm_put()

3
Documentation/pwm.txt
View File

@ -36,7 +36,8 @@ Legacy users can request a PWM device using pwm_request() and free it
after usage with pwm_free().
New users should use the pwm_get() function and pass to it the consumer
device or a consumer name. pwm_put() is used to free the PWM device.
device or a consumer name. pwm_put() is used to free the PWM device. Managed
variants of these functions, devm_pwm_get() and devm_pwm_put(), also exist.
After being requested a PWM has to be configured using:

1
arch/mips/include/asm/mach-jz4740/platform.h
View File

@ -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);

113
arch/mips/include/asm/mach-jz4740/timer.h
View File

@ -16,7 +16,120 @@
#ifndef __ASM_MACH_JZ4740_TIMER
#define __ASM_MACH_JZ4740_TIMER
#define JZ_REG_TIMER_STOP 0x0C
#define JZ_REG_TIMER_STOP_SET 0x1C
#define JZ_REG_TIMER_STOP_CLEAR 0x2C
#define JZ_REG_TIMER_ENABLE 0x00
#define JZ_REG_TIMER_ENABLE_SET 0x04
#define JZ_REG_TIMER_ENABLE_CLEAR 0x08
#define JZ_REG_TIMER_FLAG 0x10
#define JZ_REG_TIMER_FLAG_SET 0x14
#define JZ_REG_TIMER_FLAG_CLEAR 0x18
#define JZ_REG_TIMER_MASK 0x20
#define JZ_REG_TIMER_MASK_SET 0x24
#define JZ_REG_TIMER_MASK_CLEAR 0x28
#define JZ_REG_TIMER_DFR(x) (((x) * 0x10) + 0x30)
#define JZ_REG_TIMER_DHR(x) (((x) * 0x10) + 0x34)
#define JZ_REG_TIMER_CNT(x) (((x) * 0x10) + 0x38)
#define JZ_REG_TIMER_CTRL(x) (((x) * 0x10) + 0x3C)
#define JZ_TIMER_IRQ_HALF(x) BIT((x) + 0x10)
#define JZ_TIMER_IRQ_FULL(x) BIT(x)
#define JZ_TIMER_CTRL_PWM_ABBRUPT_SHUTDOWN BIT(9)
#define JZ_TIMER_CTRL_PWM_ACTIVE_LOW BIT(8)
#define JZ_TIMER_CTRL_PWM_ENABLE BIT(7)
#define JZ_TIMER_CTRL_PRESCALE_MASK 0x1c
#define JZ_TIMER_CTRL_PRESCALE_OFFSET 0x3
#define JZ_TIMER_CTRL_PRESCALE_1 (0 << 3)
#define JZ_TIMER_CTRL_PRESCALE_4 (1 << 3)
#define JZ_TIMER_CTRL_PRESCALE_16 (2 << 3)
#define JZ_TIMER_CTRL_PRESCALE_64 (3 << 3)
#define JZ_TIMER_CTRL_PRESCALE_256 (4 << 3)
#define JZ_TIMER_CTRL_PRESCALE_1024 (5 << 3)
#define JZ_TIMER_CTRL_PRESCALER(x) ((x) << JZ_TIMER_CTRL_PRESCALE_OFFSET)
#define JZ_TIMER_CTRL_SRC_EXT BIT(2)
#define JZ_TIMER_CTRL_SRC_RTC BIT(1)
#define JZ_TIMER_CTRL_SRC_PCLK BIT(0)
extern void __iomem *jz4740_timer_base;
void __init jz4740_timer_init(void);
void jz4740_timer_enable_watchdog(void);
void jz4740_timer_disable_watchdog(void);
static inline void jz4740_timer_stop(unsigned int timer)
{
writel(BIT(timer), jz4740_timer_base + JZ_REG_TIMER_STOP_SET);
}
static inline void jz4740_timer_start(unsigned int timer)
{
writel(BIT(timer), jz4740_timer_base + JZ_REG_TIMER_STOP_CLEAR);
}
static inline bool jz4740_timer_is_enabled(unsigned int timer)
{
return readb(jz4740_timer_base + JZ_REG_TIMER_ENABLE) & BIT(timer);
}
static inline void jz4740_timer_enable(unsigned int timer)
{
writeb(BIT(timer), jz4740_timer_base + JZ_REG_TIMER_ENABLE_SET);
}
static inline void jz4740_timer_disable(unsigned int timer)
{
writeb(BIT(timer), jz4740_timer_base + JZ_REG_TIMER_ENABLE_CLEAR);
}
static inline void jz4740_timer_set_period(unsigned int timer, uint16_t period)
{
writew(period, jz4740_timer_base + JZ_REG_TIMER_DFR(timer));
}
static inline void jz4740_timer_set_duty(unsigned int timer, uint16_t duty)
{
writew(duty, jz4740_timer_base + JZ_REG_TIMER_DHR(timer));
}
static inline void jz4740_timer_set_count(unsigned int timer, uint16_t count)
{
writew(count, jz4740_timer_base + JZ_REG_TIMER_CNT(timer));
}
static inline uint16_t jz4740_timer_get_count(unsigned int timer)
{
return readw(jz4740_timer_base + JZ_REG_TIMER_CNT(timer));
}
static inline void jz4740_timer_ack_full(unsigned int timer)
{
writel(JZ_TIMER_IRQ_FULL(timer), jz4740_timer_base + JZ_REG_TIMER_FLAG_CLEAR);
}
static inline void jz4740_timer_irq_full_enable(unsigned int timer)
{
writel(JZ_TIMER_IRQ_FULL(timer), jz4740_timer_base + JZ_REG_TIMER_FLAG_CLEAR);
writel(JZ_TIMER_IRQ_FULL(timer), jz4740_timer_base + JZ_REG_TIMER_MASK_CLEAR);
}
static inline void jz4740_timer_irq_full_disable(unsigned int timer)
{
writel(JZ_TIMER_IRQ_FULL(timer), jz4740_timer_base + JZ_REG_TIMER_MASK_SET);
}
static inline void jz4740_timer_set_ctrl(unsigned int timer, uint16_t ctrl)
{
writew(ctrl, jz4740_timer_base + JZ_REG_TIMER_CTRL(timer));
}
static inline uint16_t jz4740_timer_get_ctrl(unsigned int timer)
{
return readw(jz4740_timer_base + JZ_REG_TIMER_CTRL(timer));
}
#endif

3
arch/mips/jz4740/Kconfig
View File

@ -7,6 +7,3 @@ config JZ4740_QI_LB60
bool "Qi Hardware Ben NanoNote"
endchoice
config HAVE_PWM
bool

2
arch/mips/jz4740/Makefile
View File

@ -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

1
arch/mips/jz4740/board-qi_lb60.c
View File

@ -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,

6
arch/mips/jz4740/platform.c
View File

@ -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,
};

177
arch/mips/jz4740/pwm.c
View File

@ -1,177 +0,0 @@
/*
* 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);

2
arch/mips/jz4740/time.c
View File

@ -20,10 +20,10 @@
#include <linux/clockchips.h>
#include <asm/mach-jz4740/irq.h>
#include <asm/mach-jz4740/timer.h>
#include <asm/time.h>
#include "clock.h"
#include "timer.h"
#define TIMER_CLOCKEVENT 0
#define TIMER_CLOCKSOURCE 1

4
arch/mips/jz4740/timer.c
View File

@ -17,11 +17,11 @@
#include <linux/kernel.h>
#include <linux/module.h>
#include "timer.h"
#include <asm/mach-jz4740/base.h>
#include <asm/mach-jz4740/timer.h>
void __iomem *jz4740_timer_base;
EXPORT_SYMBOL_GPL(jz4740_timer_base);
void jz4740_timer_enable_watchdog(void)
{

136
arch/mips/jz4740/timer.h
View File

@ -1,136 +0,0 @@
/*
* Copyright (C) 2010, Lars-Peter Clausen <lars@metafoo.de>
* JZ4740 platform timer 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.
*
*/
#ifndef __MIPS_JZ4740_TIMER_H__
#define __MIPS_JZ4740_TIMER_H__
#include <linux/module.h>
#include <linux/io.h>
#define JZ_REG_TIMER_STOP 0x0C
#define JZ_REG_TIMER_STOP_SET 0x1C
#define JZ_REG_TIMER_STOP_CLEAR 0x2C
#define JZ_REG_TIMER_ENABLE 0x00
#define JZ_REG_TIMER_ENABLE_SET 0x04
#define JZ_REG_TIMER_ENABLE_CLEAR 0x08
#define JZ_REG_TIMER_FLAG 0x10
#define JZ_REG_TIMER_FLAG_SET 0x14
#define JZ_REG_TIMER_FLAG_CLEAR 0x18
#define JZ_REG_TIMER_MASK 0x20
#define JZ_REG_TIMER_MASK_SET 0x24
#define JZ_REG_TIMER_MASK_CLEAR 0x28
#define JZ_REG_TIMER_DFR(x) (((x) * 0x10) + 0x30)
#define JZ_REG_TIMER_DHR(x) (((x) * 0x10) + 0x34)
#define JZ_REG_TIMER_CNT(x) (((x) * 0x10) + 0x38)
#define JZ_REG_TIMER_CTRL(x) (((x) * 0x10) + 0x3C)
#define JZ_TIMER_IRQ_HALF(x) BIT((x) + 0x10)
#define JZ_TIMER_IRQ_FULL(x) BIT(x)
#define JZ_TIMER_CTRL_PWM_ABBRUPT_SHUTDOWN BIT(9)
#define JZ_TIMER_CTRL_PWM_ACTIVE_LOW BIT(8)
#define JZ_TIMER_CTRL_PWM_ENABLE BIT(7)
#define JZ_TIMER_CTRL_PRESCALE_MASK 0x1c
#define JZ_TIMER_CTRL_PRESCALE_OFFSET 0x3
#define JZ_TIMER_CTRL_PRESCALE_1 (0 << 3)
#define JZ_TIMER_CTRL_PRESCALE_4 (1 << 3)
#define JZ_TIMER_CTRL_PRESCALE_16 (2 << 3)
#define JZ_TIMER_CTRL_PRESCALE_64 (3 << 3)
#define JZ_TIMER_CTRL_PRESCALE_256 (4 << 3)
#define JZ_TIMER_CTRL_PRESCALE_1024 (5 << 3)
#define JZ_TIMER_CTRL_PRESCALER(x) ((x) << JZ_TIMER_CTRL_PRESCALE_OFFSET)
#define JZ_TIMER_CTRL_SRC_EXT BIT(2)
#define JZ_TIMER_CTRL_SRC_RTC BIT(1)
#define JZ_TIMER_CTRL_SRC_PCLK BIT(0)
extern void __iomem *jz4740_timer_base;
void __init jz4740_timer_init(void);
static inline void jz4740_timer_stop(unsigned int timer)
{
writel(BIT(timer), jz4740_timer_base + JZ_REG_TIMER_STOP_SET);
}
static inline void jz4740_timer_start(unsigned int timer)
{
writel(BIT(timer), jz4740_timer_base + JZ_REG_TIMER_STOP_CLEAR);
}
static inline bool jz4740_timer_is_enabled(unsigned int timer)
{
return readb(jz4740_timer_base + JZ_REG_TIMER_ENABLE) & BIT(timer);
}
static inline void jz4740_timer_enable(unsigned int timer)
{
writeb(BIT(timer), jz4740_timer_base + JZ_REG_TIMER_ENABLE_SET);
}
static inline void jz4740_timer_disable(unsigned int timer)
{
writeb(BIT(timer), jz4740_timer_base + JZ_REG_TIMER_ENABLE_CLEAR);
}
static inline void jz4740_timer_set_period(unsigned int timer, uint16_t period)
{
writew(period, jz4740_timer_base + JZ_REG_TIMER_DFR(timer));
}
static inline void jz4740_timer_set_duty(unsigned int timer, uint16_t duty)
{
writew(duty, jz4740_timer_base + JZ_REG_TIMER_DHR(timer));
}
static inline void jz4740_timer_set_count(unsigned int timer, uint16_t count)
{
writew(count, jz4740_timer_base + JZ_REG_TIMER_CNT(timer));
}
static inline uint16_t jz4740_timer_get_count(unsigned int timer)
{
return readw(jz4740_timer_base + JZ_REG_TIMER_CNT(timer));
}
static inline void jz4740_timer_ack_full(unsigned int timer)
{
writel(JZ_TIMER_IRQ_FULL(timer), jz4740_timer_base + JZ_REG_TIMER_FLAG_CLEAR);
}
static inline void jz4740_timer_irq_full_enable(unsigned int timer)
{
writel(JZ_TIMER_IRQ_FULL(timer), jz4740_timer_base + JZ_REG_TIMER_FLAG_CLEAR);
writel(JZ_TIMER_IRQ_FULL(timer), jz4740_timer_base + JZ_REG_TIMER_MASK_CLEAR);
}
static inline void jz4740_timer_irq_full_disable(unsigned int timer)
{
writel(JZ_TIMER_IRQ_FULL(timer), jz4740_timer_base + JZ_REG_TIMER_MASK_SET);
}
static inline void jz4740_timer_set_ctrl(unsigned int timer, uint16_t ctrl)
{
writew(ctrl, jz4740_timer_base + JZ_REG_TIMER_CTRL(timer));
}
static inline uint16_t jz4740_timer_get_ctrl(unsigned int timer)
{
return readw(jz4740_timer_base + JZ_REG_TIMER_CTRL(timer));
}
#endif

12
arch/unicore32/Kconfig
View File

@ -21,9 +21,6 @@ config UNICORE32
designs licensed by PKUnity Ltd.
Please see web page at <http://www.pkunity.com/>.
config HAVE_PWM
bool
config GENERIC_GPIO
def_bool y
@ -106,7 +103,8 @@ config PUV3_DB0913
config PUV3_NB0916
bool "NetBook board (0916)"
select HAVE_PWM
select PWM
select PWM_PUV3
config PUV3_SMW0919
bool "Security Mini-Workstation board (0919)"
@ -220,12 +218,6 @@ config PUV3_GPIO
select GPIO_SYSFS if EXPERIMENTAL
default y
config PUV3_PWM
tristate
default BACKLIGHT_PWM
help
Enable support for NB0916 PWM controllers
if PUV3_NB0916
menu "PKUnity NetBook-0916 Features"

18
arch/unicore32/include/mach/regs-ost.h
View File

@ -33,18 +33,16 @@
* Interrupt Enable Reg OST_OIER
*/
#define OST_OIER (PKUNITY_OST_BASE + 0x001C)
/*
* PWM Pulse Width Control Reg OST_PWMPWCR
* PWM Registers: IO base address: PKUNITY_OST_BASE + 0x80
* PWCR: Pulse Width Control Reg
* DCCR: Duty Cycle Control Reg
* PCR: Period Control Reg
*/
#define OST_PWMPWCR (PKUNITY_OST_BASE + 0x0080)
/*
* PWM Duty Cycle Control Reg OST_PWMDCCR
*/
#define OST_PWMDCCR (PKUNITY_OST_BASE + 0x0084)
/*
* PWM Period Control Reg OST_PWMPCR
*/
#define OST_PWMPCR (PKUNITY_OST_BASE + 0x0088)
#define OST_PWM_PWCR (0x00)
#define OST_PWM_DCCR (0x04)
#define OST_PWM_PCR (0x08)
/*
* Match detected 0 OST_OSSR_M0

1
arch/unicore32/kernel/Makefile
View File

@ -16,7 +16,6 @@ obj-$(CONFIG_UNICORE_FPU_F64) += fpu-ucf64.o
obj-$(CONFIG_ARCH_PUV3) += clock.o irq.o time.o
obj-$(CONFIG_PUV3_GPIO) += gpio.o
obj-$(CONFIG_PUV3_PWM) += pwm.o
obj-$(CONFIG_PUV3_PM) += pm.o sleep.o
obj-$(CONFIG_HIBERNATION) += hibernate.o hibernate_asm.o

263
arch/unicore32/kernel/pwm.c
View File

@ -1,263 +0,0 @@
/*
* linux/arch/unicore32/kernel/pwm.c
*
* Code specific to PKUnity SoC and UniCore ISA
*
* Maintained by GUAN Xue-tao <gxt@mprc.pku.edu.cn>
* Copyright (C) 2001-2010 Guan Xuetao
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/err.h>
#include <linux/clk.h>
#include <linux/io.h>
#include <linux/pwm.h>
#include <asm/div64.h>
#include <mach/hardware.h>
struct pwm_device {
struct list_head node;
struct platform_device *pdev;
const char *label;
struct clk *clk;
int clk_enabled;
unsigned int use_count;
unsigned int pwm_id;
};
/*
* 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)
{
unsigned long long c;
unsigned long period_cycles, prescale, pv, dc;
if (pwm == NULL || period_ns == 0 || duty_ns > period_ns)
return -EINVAL;
c = clk_get_rate(pwm->clk);
c = c * period_ns;
do_div(c, 1000000000);
period_cycles = c;
if (period_cycles < 1)
period_cycles = 1;
prescale = (period_cycles - 1) / 1024;
pv = period_cycles / (prescale + 1) - 1;
if (prescale > 63)
return -EINVAL;
if (duty_ns == period_ns)
dc = OST_PWMDCCR_FDCYCLE;
else
dc = (pv + 1) * duty_ns / period_ns;
/* NOTE: the clock to PWM has to be enabled first
* before writing to the registers
*/
clk_enable(pwm->clk);
OST_PWMPWCR = prescale;
OST_PWMDCCR = pv - dc;
OST_PWMPCR = pv;
clk_disable(pwm->clk);
return 0;
}
EXPORT_SYMBOL(pwm_config);
int pwm_enable(struct pwm_device *pwm)
{
int rc = 0;
if (!pwm->clk_enabled) {
rc = clk_enable(pwm->clk);
if (!rc)
pwm->clk_enabled = 1;
}
return rc;
}
EXPORT_SYMBOL(pwm_enable);
void pwm_disable(struct pwm_device *pwm)
{
if (pwm->clk_enabled) {
clk_disable(pwm->clk);
pwm->clk_enabled = 0;
}
}
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_device *pwm_probe(struct platform_device *pdev,
unsigned int pwm_id, struct pwm_device *parent_pwm)
{
struct pwm_device *pwm;
struct resource *r;
int ret = 0;
pwm = kzalloc(sizeof(struct pwm_device), GFP_KERNEL);
if (pwm == NULL) {
dev_err(&pdev->dev, "failed to allocate memory\n");
return ERR_PTR(-ENOMEM);
}
pwm->clk = clk_get(NULL, "OST_CLK");
if (IS_ERR(pwm->clk)) {
ret = PTR_ERR(pwm->clk);
goto err_free;
}
pwm->clk_enabled = 0;
pwm->use_count = 0;
pwm->pwm_id = pwm_id;
pwm->pdev = pdev;
r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (r == NULL) {
dev_err(&pdev->dev, "no memory resource defined\n");
ret = -ENODEV;
goto err_free_clk;
}
r = request_mem_region(r->start, resource_size(r), pdev->name);
if (r == NULL) {
dev_err(&pdev->dev, "failed to request memory resource\n");
ret = -EBUSY;
goto err_free_clk;
}
__add_pwm(pwm);
platform_set_drvdata(pdev, pwm);
return pwm;
err_free_clk:
clk_put(pwm->clk);
err_free:
kfree(pwm);
return ERR_PTR(ret);
}
static int __devinit puv3_pwm_probe(struct platform_device *pdev)
{
struct pwm_device *pwm = pwm_probe(pdev, pdev->id, NULL);
if (IS_ERR(pwm))
return PTR_ERR(pwm);
return 0;
}
static int __devexit pwm_remove(struct platform_device *pdev)
{
struct pwm_device *pwm;
struct resource *r;
pwm = platform_get_drvdata(pdev);
if (pwm == NULL)
return -ENODEV;
mutex_lock(&pwm_lock);
list_del(&pwm->node);
mutex_unlock(&pwm_lock);
r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
release_mem_region(r->start, resource_size(r));
clk_put(pwm->clk);
kfree(pwm);
return 0;
}
static struct platform_driver puv3_pwm_driver = {
.driver = {
.name = "PKUnity-v3-PWM",
},
.probe = puv3_pwm_probe,
.remove = __devexit_p(pwm_remove),
};
static int __init pwm_init(void)
{
int ret = 0;
ret = platform_driver_register(&puv3_pwm_driver);
if (ret) {
printk(KERN_ERR "failed to register puv3_pwm_driver\n");
return ret;
}
return ret;
}
arch_initcall(pwm_init);
static void __exit pwm_exit(void)
{
platform_driver_unregister(&puv3_pwm_driver);
}
module_exit(pwm_exit);
MODULE_LICENSE("GPL v2");

10
drivers/misc/Kconfig
View File

@ -60,16 +60,6 @@ config ATMEL_PWM
purposes including software controlled power-efficient backlights
on LCD displays, motor control, and waveform generation.
config AB8500_PWM
bool "AB8500 PWM support"
depends on AB8500_CORE && ARCH_U8500
select HAVE_PWM
depends on !PWM
help
This driver exports functions to enable/disble/config/free Pulse
Width Modulation in the Analog Baseband Chip AB8500.
It is used by led and backlight driver to control the intensity.
config ATMEL_TCLIB
bool "Atmel AT32/AT91 Timer/Counter Library"
depends on (AVR32 || ARCH_AT91)

1
drivers/misc/Makefile
View File

@ -44,7 +44,6 @@ obj-$(CONFIG_VMWARE_BALLOON) += vmw_balloon.o
obj-$(CONFIG_ARM_CHARLCD) += arm-charlcd.o
obj-$(CONFIG_PCH_PHUB) += pch_phub.o
obj-y += ti-st/
obj-$(CONFIG_AB8500_PWM) += ab8500-pwm.o
obj-y += lis3lv02d/
obj-y += carma/
obj-$(CONFIG_USB_SWITCH_FSA9480) += fsa9480.o

29
drivers/pwm/Kconfig
View File

@ -1,6 +1,5 @@
menuconfig PWM
bool "Pulse-Width Modulation (PWM) Support"
depends on !MACH_JZ4740 && !PUV3_PWM
help
Generic Pulse-Width Modulation (PWM) support.
@ -29,6 +28,15 @@ menuconfig PWM
if PWM
config PWM_AB8500
tristate "AB8500 PWM support"
depends on AB8500_CORE && ARCH_U8500
help
Generic PWM framework driver for Analog Baseband AB8500.
To compile this driver as a module, choose M here: the module
will be called pwm-ab8500.
config PWM_BFIN
tristate "Blackfin PWM support"
depends on BFIN_GPTIMERS
@ -47,6 +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
@ -67,6 +85,15 @@ config PWM_MXS
To compile this driver as a module, choose M here: the module
will be called pwm-mxs.
config PWM_PUV3
tristate "PKUnity NetBook-0916 PWM support"
depends on ARCH_PUV3
help
Generic PWM framework driver for PKUnity NetBook-0916.
To compile this driver as a module, choose M here: the module
will be called pwm-puv3.
config PWM_PXA
tristate "PXA PWM support"
depends on ARCH_PXA

3
drivers/pwm/Makefile
View File

@ -1,8 +1,11 @@
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
obj-$(CONFIG_PWM_PXA) += pwm-pxa.o
obj-$(CONFIG_PWM_SAMSUNG) += pwm-samsung.o
obj-$(CONFIG_PWM_TEGRA) += pwm-tegra.o

82
drivers/pwm/core.c
View File

@ -371,13 +371,35 @@ EXPORT_SYMBOL_GPL(pwm_free);
*/
int pwm_config(struct pwm_device *pwm, int duty_ns, int period_ns)
{
if (!pwm || period_ns == 0 || duty_ns > period_ns)
if (!pwm || duty_ns < 0 || period_ns <= 0 || duty_ns > period_ns)
return -EINVAL;
return pwm->chip->ops->config(pwm->chip, pwm, duty_ns, period_ns);
}
EXPORT_SYMBOL_GPL(pwm_config);
/**
* pwm_set_polarity() - configure the polarity of a PWM signal
* @pwm: PWM device
* @polarity: new polarity of the PWM signal
*
* Note that the polarity cannot be configured while the PWM device is enabled
*/
int pwm_set_polarity(struct pwm_device *pwm, enum pwm_polarity polarity)
{
if (!pwm || !pwm->chip->ops)
return -EINVAL;
if (!pwm->chip->ops->set_polarity)
return -ENOSYS;
if (test_bit(PWMF_ENABLED, &pwm->flags))
return -EBUSY;
return pwm->chip->ops->set_polarity(pwm->chip, pwm, polarity);
}
EXPORT_SYMBOL_GPL(pwm_set_polarity);
/**
* pwm_enable() - start a PWM output toggling
* @pwm: PWM device
@ -624,6 +646,64 @@ out:
}
EXPORT_SYMBOL_GPL(pwm_put);
static void devm_pwm_release(struct device *dev, void *res)
{
pwm_put(*(struct pwm_device **)res);
}
/**
* devm_pwm_get() - resource managed pwm_get()
* @dev: device for PWM consumer
* @con_id: consumer name
*
* This function performs like pwm_get() but the acquired PWM device will
* automatically be released on driver detach.
*/
struct pwm_device *devm_pwm_get(struct device *dev, const char *con_id)
{
struct pwm_device **ptr, *pwm;
ptr = devres_alloc(devm_pwm_release, sizeof(**ptr), GFP_KERNEL);
if (!ptr)
return ERR_PTR(-ENOMEM);
pwm = pwm_get(dev, con_id);
if (!IS_ERR(pwm)) {
*ptr = pwm;
devres_add(dev, ptr);
} else {
devres_free(ptr);
}
return pwm;
}
EXPORT_SYMBOL_GPL(devm_pwm_get);
static int devm_pwm_match(struct device *dev, void *res, void *data)
{
struct pwm_device **p = res;
if (WARN_ON(!p || !*p))
return 0;
return *p == data;
}
/**
* devm_pwm_put() - resource managed pwm_put()
* @dev: device for PWM consumer
* @pwm: PWM device
*
* Release a PWM previously allocated using devm_pwm_get(). Calling this
* function is usually not needed because devm-allocated resources are
* automatically released on driver detach.
*/
void devm_pwm_put(struct device *dev, struct pwm_device *pwm)
{
WARN_ON(devres_release(dev, devm_pwm_release, devm_pwm_match, pwm));
}
EXPORT_SYMBOL_GPL(devm_pwm_put);
#ifdef CONFIG_DEBUG_FS
static void pwm_dbg_show(struct pwm_chip *chip, struct seq_file *s)
{

116
drivers/misc/ab8500-pwm.c → drivers/pwm/pwm-ab8500.c
View File

@ -24,16 +24,12 @@
#define ENABLE_PWM 1
#define DISABLE_PWM 0
struct pwm_device {
struct device *dev;
struct list_head node;
const char *label;
unsigned int pwm_id;
struct ab8500_pwm_chip {
struct pwm_chip chip;
};
static LIST_HEAD(pwm_list);
int pwm_config(struct pwm_device *pwm, int duty_ns, int period_ns)
static int ab8500_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
int duty_ns, int period_ns)
{
int ret = 0;
unsigned int higher_val, lower_val;
@ -50,95 +46,94 @@ int pwm_config(struct pwm_device *pwm, int duty_ns, int period_ns)
*/
higher_val = ((duty_ns & 0x0300) >> 8);
reg = AB8500_PWM_OUT_CTRL1_REG + ((pwm->pwm_id - 1) * 2);
reg = AB8500_PWM_OUT_CTRL1_REG + ((chip->base - 1) * 2);
ret = abx500_set_register_interruptible(pwm->dev, AB8500_MISC,
ret = abx500_set_register_interruptible(chip->dev, AB8500_MISC,
reg, (u8)lower_val);
if (ret < 0)
return ret;
ret = abx500_set_register_interruptible(pwm->dev, AB8500_MISC,
ret = abx500_set_register_interruptible(chip->dev, AB8500_MISC,
(reg + 1), (u8)higher_val);
return ret;
}
EXPORT_SYMBOL(pwm_config);
int pwm_enable(struct pwm_device *pwm)
static int ab8500_pwm_enable(struct pwm_chip *chip, struct pwm_device *pwm)
{
int ret;
ret = abx500_mask_and_set_register_interruptible(pwm->dev,
ret = abx500_mask_and_set_register_interruptible(chip->dev,
AB8500_MISC, AB8500_PWM_OUT_CTRL7_REG,
1 << (pwm->pwm_id-1), ENABLE_PWM);
1 << (chip->base - 1), ENABLE_PWM);
if (ret < 0)
dev_err(pwm->dev, "%s: Failed to disable PWM, Error %d\n",
dev_err(chip->dev, "%s: Failed to disable PWM, Error %d\n",
pwm->label, ret);
return ret;
}
EXPORT_SYMBOL(pwm_enable);
void pwm_disable(struct pwm_device *pwm)
static void ab8500_pwm_disable(struct pwm_chip *chip, struct pwm_device *pwm)
{
int ret;
ret = abx500_mask_and_set_register_interruptible(pwm->dev,
ret = abx500_mask_and_set_register_interruptible(chip->dev,
AB8500_MISC, AB8500_PWM_OUT_CTRL7_REG,
1 << (pwm->pwm_id-1), DISABLE_PWM);
1 << (chip->base - 1), DISABLE_PWM);
if (ret < 0)
dev_err(pwm->dev, "%s: Failed to disable PWM, Error %d\n",
dev_err(chip->dev, "%s: Failed to disable PWM, Error %d\n",
pwm->label, ret);
return;
}
EXPORT_SYMBOL(pwm_disable);
struct pwm_device *pwm_request(int pwm_id, const char *label)
{
struct pwm_device *pwm;
list_for_each_entry(pwm, &pwm_list, node) {
if (pwm->pwm_id == pwm_id) {
pwm->label = label;
pwm->pwm_id = pwm_id;
return pwm;
}
}
return ERR_PTR(-ENOENT);
}
EXPORT_SYMBOL(pwm_request);
void pwm_free(struct pwm_device *pwm)
{
pwm_disable(pwm);
}
EXPORT_SYMBOL(pwm_free);
static const struct pwm_ops ab8500_pwm_ops = {
.config = ab8500_pwm_config,
.enable = ab8500_pwm_enable,
.disable = ab8500_pwm_disable,
};
static int __devinit ab8500_pwm_probe(struct platform_device *pdev)
{
struct pwm_device *pwm;
struct ab8500_pwm_chip *ab8500;
int err;
/*
* Nothing to be done in probe, this is required to get the
* device which is required for ab8500 read and write
*/
pwm = kzalloc(sizeof(struct pwm_device), GFP_KERNEL);
if (pwm == NULL) {
ab8500 = kzalloc(sizeof(*ab8500), GFP_KERNEL);
if (ab8500 == NULL) {
dev_err(&pdev->dev, "failed to allocate memory\n");
return -ENOMEM;
}
pwm->dev = &pdev->dev;
pwm->pwm_id = pdev->id;
list_add_tail(&pwm->node, &pwm_list);
platform_set_drvdata(pdev, pwm);
dev_dbg(pwm->dev, "pwm probe successful\n");
ab8500->chip.dev = &pdev->dev;
ab8500->chip.ops = &ab8500_pwm_ops;
ab8500->chip.base = pdev->id;
ab8500->chip.npwm = 1;
err = pwmchip_add(&ab8500->chip);
if (err < 0) {
kfree(ab8500);
return err;
}
dev_dbg(&pdev->dev, "pwm probe successful\n");
platform_set_drvdata(pdev, ab8500);
return 0;
}
static int __devexit ab8500_pwm_remove(struct platform_device *pdev)
{
struct pwm_device *pwm = platform_get_drvdata(pdev);
list_del(&pwm->node);
struct ab8500_pwm_chip *ab8500 = platform_get_drvdata(pdev);
int err;
err = pwmchip_remove(&ab8500->chip);
if (err < 0)
return err;
dev_dbg(&pdev->dev, "pwm driver removed\n");
kfree(pwm);
kfree(ab8500);
return 0;
}
@ -150,19 +145,8 @@ static struct platform_driver ab8500_pwm_driver = {
.probe = ab8500_pwm_probe,
.remove = __devexit_p(ab8500_pwm_remove),
};
module_platform_driver(ab8500_pwm_driver);
static int __init ab8500_pwm_init(void)
{
return platform_driver_register(&ab8500_pwm_driver);
}
static void __exit ab8500_pwm_exit(void)
{
platform_driver_unregister(&ab8500_pwm_driver);
}
subsys_initcall(ab8500_pwm_init);
module_exit(ab8500_pwm_exit);
MODULE_AUTHOR("Arun MURTHY <arun.murthy@stericsson.com>");
MODULE_DESCRIPTION("AB8500 Pulse Width Modulation Driver");
MODULE_ALIAS("platform:ab8500-pwm");

3
drivers/pwm/pwm-bfin.c
View File

@ -69,9 +69,6 @@ static int bfin_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
unsigned long period, duty;
unsigned long long val;
if (duty_ns < 0 || duty_ns > period_ns)
return -EINVAL;
val = (unsigned long long)get_sclk() * period_ns;
do_div(val, NSEC_PER_SEC);
period = val;

274
drivers/pwm/pwm-imx.c
View File

@ -16,8 +16,7 @@
#include <linux/clk.h>
#include <linux/io.h>
#include <linux/pwm.h>
#include <mach/hardware.h>
#include <linux/of_device.h>
/* i.MX1 and i.MX21 share the same PWM function block: */
@ -25,6 +24,7 @@
#define MX1_PWMS 0x04 /* PWM Sample Register */
#define MX1_PWMP 0x08 /* PWM Period Register */
#define MX1_PWMC_EN (1 << 4)
/* i.MX27, i.MX31, i.MX35 share the same PWM function block: */
@ -40,110 +40,165 @@
#define MX3_PWMCR_EN (1 << 0)
struct imx_chip {
struct clk *clk;
struct clk *clk_per;
struct clk *clk_ipg;
int clk_enabled;
int enabled;
void __iomem *mmio_base;
struct pwm_chip chip;
int (*config)(struct pwm_chip *chip,
struct pwm_device *pwm, int duty_ns, int period_ns);
void (*set_enable)(struct pwm_chip *chip, bool enable);
};
#define to_imx_chip(chip) container_of(chip, struct imx_chip, chip)
static int imx_pwm_config_v1(struct pwm_chip *chip,
struct pwm_device *pwm, int duty_ns, int period_ns)
{
struct imx_chip *imx = to_imx_chip(chip);
/*
* The PWM subsystem allows for exact frequencies. However,
* I cannot connect a scope on my device to the PWM line and
* thus cannot provide the program the PWM controller
* exactly. Instead, I'm relying on the fact that the
* Bootloader (u-boot or WinCE+haret) has programmed the PWM
* function group already. So I'll just modify the PWM sample
* register to follow the ratio of duty_ns vs. period_ns
* accordingly.
*
* This is good enough for programming the brightness of
* the LCD backlight.
*
* The real implementation would divide PERCLK[0] first by
* both the prescaler (/1 .. /128) and then by CLKSEL
* (/2 .. /16).
*/
u32 max = readl(imx->mmio_base + MX1_PWMP);
u32 p = max * duty_ns / period_ns;
writel(max - p, imx->mmio_base + MX1_PWMS);
return 0;
}
static void imx_pwm_set_enable_v1(struct pwm_chip *chip, bool enable)
{
struct imx_chip *imx = to_imx_chip(chip);
u32 val;
val = readl(imx->mmio_base + MX1_PWMC);
if (enable)
val |= MX1_PWMC_EN;
else
val &= ~MX1_PWMC_EN;
writel(val, imx->mmio_base + MX1_PWMC);
}
static int imx_pwm_config_v2(struct pwm_chip *chip,
struct pwm_device *pwm, int duty_ns, int period_ns)
{
struct imx_chip *imx = to_imx_chip(chip);
unsigned long long c;
unsigned long period_cycles, duty_cycles, prescale;
u32 cr;
c = clk_get_rate(imx->clk_per);
c = c * period_ns;
do_div(c, 1000000000);
period_cycles = c;
prescale = period_cycles / 0x10000 + 1;
period_cycles /= prescale;
c = (unsigned long long)period_cycles * duty_ns;
do_div(c, period_ns);
duty_cycles = c;
/*
* according to imx pwm RM, the real period value should be
* PERIOD value in PWMPR plus 2.
*/
if (period_cycles > 2)
period_cycles -= 2;
else
period_cycles = 0;
writel(duty_cycles, imx->mmio_base + MX3_PWMSAR);
writel(period_cycles, imx->mmio_base + MX3_PWMPR);
cr = MX3_PWMCR_PRESCALER(prescale) |
MX3_PWMCR_DOZEEN | MX3_PWMCR_WAITEN |
MX3_PWMCR_DBGEN | MX3_PWMCR_CLKSRC_IPG_HIGH;
if (imx->enabled)
cr |= MX3_PWMCR_EN;
writel(cr, imx->mmio_base + MX3_PWMCR);
return 0;
}
static void imx_pwm_set_enable_v2(struct pwm_chip *chip, bool enable)
{
struct imx_chip *imx = to_imx_chip(chip);
u32 val;
val = readl(imx->mmio_base + MX3_PWMCR);
if (enable)
val |= MX3_PWMCR_EN;
else
val &= ~MX3_PWMCR_EN;
writel(val, imx->mmio_base + MX3_PWMCR);
}
static int imx_pwm_config(struct pwm_chip *chip,
struct pwm_device *pwm, int duty_ns, int period_ns)
{
struct imx_chip *imx = to_imx_chip(chip);
int ret;
if (!(cpu_is_mx1() || cpu_is_mx21())) {
unsigned long long c;
unsigned long period_cycles, duty_cycles, prescale;
u32 cr;
ret = clk_prepare_enable(imx->clk_ipg);
if (ret)
return ret;
c = clk_get_rate(imx->clk);
c = c * period_ns;
do_div(c, 1000000000);
period_cycles = c;
ret = imx->config(chip, pwm, duty_ns, period_ns);
prescale = period_cycles / 0x10000 + 1;
clk_disable_unprepare(imx->clk_ipg);
period_cycles /= prescale;
c = (unsigned long long)period_cycles * duty_ns;
do_div(c, period_ns);
duty_cycles = c;
/*
* according to imx pwm RM, the real period value should be
* PERIOD value in PWMPR plus 2.
*/
if (period_cycles > 2)
period_cycles -= 2;
else
period_cycles = 0;
writel(duty_cycles, imx->mmio_base + MX3_PWMSAR);
writel(period_cycles, imx->mmio_base + MX3_PWMPR);
cr = MX3_PWMCR_PRESCALER(prescale) |
MX3_PWMCR_DOZEEN | MX3_PWMCR_WAITEN |
MX3_PWMCR_DBGEN | MX3_PWMCR_EN;
if (cpu_is_mx25())
cr |= MX3_PWMCR_CLKSRC_IPG;
else
cr |= MX3_PWMCR_CLKSRC_IPG_HIGH;
writel(cr, imx->mmio_base + MX3_PWMCR);
} else if (cpu_is_mx1() || cpu_is_mx21()) {
/* The PWM subsystem allows for exact frequencies. However,
* I cannot connect a scope on my device to the PWM line and
* thus cannot provide the program the PWM controller
* exactly. Instead, I'm relying on the fact that the
* Bootloader (u-boot or WinCE+haret) has programmed the PWM
* function group already. So I'll just modify the PWM sample
* register to follow the ratio of duty_ns vs. period_ns
* accordingly.
*
* This is good enough for programming the brightness of
* the LCD backlight.
*
* The real implementation would divide PERCLK[0] first by
* both the prescaler (/1 .. /128) and then by CLKSEL
* (/2 .. /16).
*/
u32 max = readl(imx->mmio_base + MX1_PWMP);
u32 p = max * duty_ns / period_ns;
writel(max - p, imx->mmio_base + MX1_PWMS);
} else {
BUG();
}
return 0;
return ret;
}
static int imx_pwm_enable(struct pwm_chip *chip, struct pwm_device *pwm)
{
struct imx_chip *imx = to_imx_chip(chip);
int rc = 0;
int ret;
if (!imx->clk_enabled) {
rc = clk_prepare_enable(imx->clk);
if (!rc)
imx->clk_enabled = 1;
}
return rc;
ret = clk_prepare_enable(imx->clk_per);
if (ret)
return ret;
imx->set_enable(chip, true);
imx->enabled = 1;
return 0;
}
static void imx_pwm_disable(struct pwm_chip *chip, struct pwm_device *pwm)
{
struct imx_chip *imx = to_imx_chip(chip);
writel(0, imx->mmio_base + MX3_PWMCR);
imx->set_enable(chip, false);
if (imx->clk_enabled) {
clk_disable_unprepare(imx->clk);
imx->clk_enabled = 0;
}
clk_disable_unprepare(imx->clk_per);
imx->enabled = 0;
}
static struct pwm_ops imx_pwm_ops = {
@ -153,30 +208,66 @@ static struct pwm_ops imx_pwm_ops = {
.owner = THIS_MODULE,
};
struct imx_pwm_data {
int (*config)(struct pwm_chip *chip,
struct pwm_device *pwm, int duty_ns, int period_ns);
void (*set_enable)(struct pwm_chip *chip, bool enable);
};
static struct imx_pwm_data imx_pwm_data_v1 = {
.config = imx_pwm_config_v1,
.set_enable = imx_pwm_set_enable_v1,
};
static struct imx_pwm_data imx_pwm_data_v2 = {
.config = imx_pwm_config_v2,
.set_enable = imx_pwm_set_enable_v2,
};
static const struct of_device_id imx_pwm_dt_ids[] = {
{ .compatible = "fsl,imx1-pwm", .data = &imx_pwm_data_v1, },
{ .compatible = "fsl,imx27-pwm", .data = &imx_pwm_data_v2, },
{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, imx_pwm_dt_ids);
static int __devinit imx_pwm_probe(struct platform_device *pdev)
{
const struct of_device_id *of_id =
of_match_device(imx_pwm_dt_ids, &pdev->dev);
struct imx_pwm_data *data;
struct imx_chip *imx;
struct resource *r;
int ret = 0;
if (!of_id)
return -ENODEV;
imx = devm_kzalloc(&pdev->dev, sizeof(*imx), GFP_KERNEL);
if (imx == NULL) {
dev_err(&pdev->dev, "failed to allocate memory\n");
return -ENOMEM;
}
imx->clk = devm_clk_get(&pdev->dev, "pwm");
imx->clk_per = devm_clk_get(&pdev->dev, "per");
if (IS_ERR(imx->clk_per)) {
dev_err(&pdev->dev, "getting per clock failed with %ld\n",
PTR_ERR(imx->clk_per));
return PTR_ERR(imx->clk_per);
}
if (IS_ERR(imx->clk))
return PTR_ERR(imx->clk);
imx->clk_ipg = devm_clk_get(&pdev->dev, "ipg");
if (IS_ERR(imx->clk_ipg)) {
dev_err(&pdev->dev, "getting ipg clock failed with %ld\n",
PTR_ERR(imx->clk_ipg));
return PTR_ERR(imx->clk_ipg);
}
imx->chip.ops = &imx_pwm_ops;
imx->chip.dev = &pdev->dev;
imx->chip.base = -1;
imx->chip.npwm = 1;
imx->clk_enabled = 0;
r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (r == NULL) {
dev_err(&pdev->dev, "no memory resource defined\n");
@ -187,6 +278,10 @@ static int __devinit imx_pwm_probe(struct platform_device *pdev)
if (imx->mmio_base == NULL)
return -EADDRNOTAVAIL;
data = of_id->data;
imx->config = data->config;
imx->set_enable = data->set_enable;
ret = pwmchip_add(&imx->chip);
if (ret < 0)
return ret;
@ -208,23 +303,14 @@ static int __devexit imx_pwm_remove(struct platform_device *pdev)
static struct platform_driver imx_pwm_driver = {
.driver = {
.name = "mxc_pwm",
.name = "imx-pwm",
.of_match_table = of_match_ptr(imx_pwm_dt_ids),
},
.probe = imx_pwm_probe,
.remove = __devexit_p(imx_pwm_remove),
};
static int __init imx_pwm_init(void)
{
return platform_driver_register(&imx_pwm_driver);
}
arch_initcall(imx_pwm_init);
static void __exit imx_pwm_exit(void)
{
platform_driver_unregister(&imx_pwm_driver);
}
module_exit(imx_pwm_exit);
module_platform_driver(imx_pwm_driver);
MODULE_LICENSE("GPL v2");
MODULE_AUTHOR("Sascha Hauer <s.hauer@pengutronix.de>");

221
drivers/pwm/pwm-jz4740.c Normal file
View File

@ -0,0 +1,221 @@
/*
* 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");

161
drivers/pwm/pwm-puv3.c Normal file
View File

@ -0,0 +1,161 @@
/*
* linux/arch/unicore32/kernel/pwm.c
*
* Code specific to PKUnity SoC and UniCore ISA
*
* Maintained by GUAN Xue-tao <gxt@mprc.pku.edu.cn>
* Copyright (C) 2001-2010 Guan Xuetao
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/err.h>
#include <linux/clk.h>
#include <linux/io.h>
#include <linux/pwm.h>
#include <asm/div64.h>
#include <mach/hardware.h>
struct puv3_pwm_chip {
struct pwm_chip chip;
void __iomem *base;
struct clk *clk;
bool enabled;
};
static inline struct puv3_pwm_chip *to_puv3(struct pwm_chip *chip)
{
return container_of(chip, struct puv3_pwm_chip, chip);
}
/*
* period_ns = 10^9 * (PRESCALE + 1) * (PV + 1) / PWM_CLK_RATE
* duty_ns = 10^9 * (PRESCALE + 1) * DC / PWM_CLK_RATE
*/
static int puv3_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
int duty_ns, int period_ns)
{
unsigned long period_cycles, prescale, pv, dc;
struct puv3_pwm_chip *puv3 = to_puv3(chip);
unsigned long long c;
c = clk_get_rate(puv3->clk);
c = c * period_ns;
do_div(c, 1000000000);
period_cycles = c;
if (period_cycles < 1)
period_cycles = 1;
prescale = (period_cycles - 1) / 1024;
pv = period_cycles / (prescale + 1) - 1;
if (prescale > 63)
return -EINVAL;
if (duty_ns == period_ns)
dc = OST_PWMDCCR_FDCYCLE;
else
dc = (pv + 1) * duty_ns / period_ns;
/*
* NOTE: the clock to PWM has to be enabled first
* before writing to the registers
*/
clk_prepare_enable(puv3->clk);
writel(prescale, puv3->base + OST_PWM_PWCR);
writel(pv - dc, puv3->base + OST_PWM_DCCR);
writel(pv, puv3->base + OST_PWM_PCR);
clk_disable_unprepare(puv3->clk);
return 0;
}
static int puv3_pwm_enable(struct pwm_chip *chip, struct pwm_device *pwm)
{
struct puv3_pwm_chip *puv3 = to_puv3(chip);
return clk_prepare_enable(puv3->clk);
}
static void puv3_pwm_disable(struct pwm_chip *chip, struct pwm_device *pwm)
{
struct puv3_pwm_chip *puv3 = to_puv3(chip);
clk_disable_unprepare(puv3->clk);
}
static const struct pwm_ops puv3_pwm_ops = {
.config = puv3_pwm_config,
.enable = puv3_pwm_enable,
.disable = puv3_pwm_disable,
.owner = THIS_MODULE,
};
static int __devinit pwm_probe(struct platform_device *pdev)
{
struct puv3_pwm_chip *puv3;
struct resource *r;
int ret;
puv3 = devm_kzalloc(&pdev->dev, sizeof(*puv3), GFP_KERNEL);
if (puv3 == NULL) {
dev_err(&pdev->dev, "failed to allocate memory\n");
return -ENOMEM;
}
puv3->clk = devm_clk_get(&pdev->dev, "OST_CLK");
if (IS_ERR(puv3->clk))
return PTR_ERR(puv3->clk);
r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (r == NULL) {
dev_err(&pdev->dev, "no memory resource defined\n");
return -ENODEV;
}
puv3->base = devm_request_and_ioremap(&pdev->dev, r);
if (puv3->base == NULL)
return -EADDRNOTAVAIL;
puv3->chip.dev = &pdev->dev;
puv3->chip.ops = &puv3_pwm_ops;
puv3->chip.base = -1;
puv3->chip.npwm = 1;
ret = pwmchip_add(&puv3->chip);
if (ret < 0) {
dev_err(&pdev->dev, "pwmchip_add() failed: %d\n", ret);
return ret;
}
platform_set_drvdata(pdev, puv3);
return 0;
}
static int __devexit pwm_remove(struct platform_device *pdev)
{
struct puv3_pwm_chip *puv3 = platform_get_drvdata(pdev);
return pwmchip_remove(&puv3->chip);
}
static struct platform_driver puv3_pwm_driver = {
.driver = {
.name = "PKUnity-v3-PWM",
},
.probe = pwm_probe,
.remove = __devexit_p(pwm_remove),
};
module_platform_driver(puv3_pwm_driver);
MODULE_LICENSE("GPL v2");

3
drivers/pwm/pwm-pxa.c
View File

@ -70,9 +70,6 @@ static int pxa_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
unsigned long offset;
int rc;
if (period_ns == 0 || duty_ns > period_ns)
return -EINVAL;
offset = pwm->hwpwm ? 0x10 : 0;
c = clk_get_rate(pc->clk);

3
drivers/pwm/pwm-samsung.c
View File

@ -126,9 +126,6 @@ static int s3c_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
if (period_ns > NS_IN_HZ || duty_ns > NS_IN_HZ)
return -ERANGE;
if (duty_ns > period_ns)
return -EINVAL;
if (period_ns == s3c->period_ns &&
duty_ns == s3c->duty_ns)
return 0;

24
drivers/pwm/pwm-tiecap.c
View File

@ -32,6 +32,7 @@
#define CAP3 0x10
#define CAP4 0x14
#define ECCTL2 0x2A
#define ECCTL2_APWM_POL_LOW BIT(10)
#define ECCTL2_APWM_MODE BIT(9)
#define ECCTL2_SYNC_SEL_DISA (BIT(7) | BIT(6))
#define ECCTL2_TSCTR_FREERUN BIT(4)
@ -59,7 +60,7 @@ static int ecap_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
unsigned long period_cycles, duty_cycles;
unsigned int reg_val;
if (period_ns < 0 || duty_ns < 0 || period_ns > NSEC_PER_SEC)
if (period_ns > NSEC_PER_SEC)
return -ERANGE;
c = pc->clk_rate;
@ -111,6 +112,26 @@ static int ecap_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
return 0;
}
static int ecap_pwm_set_polarity(struct pwm_chip *chip, struct pwm_device *pwm,
enum pwm_polarity polarity)
{
struct ecap_pwm_chip *pc = to_ecap_pwm_chip(chip);
unsigned short reg_val;
pm_runtime_get_sync(pc->chip.dev);
reg_val = readw(pc->mmio_base + ECCTL2);
if (polarity == PWM_POLARITY_INVERSED)
/* Duty cycle defines LOW period of PWM */
reg_val |= ECCTL2_APWM_POL_LOW;
else
/* Duty cycle defines HIGH period of PWM */
reg_val &= ~ECCTL2_APWM_POL_LOW;
writew(reg_val, pc->mmio_base + ECCTL2);
pm_runtime_put_sync(pc->chip.dev);
return 0;
}
static int ecap_pwm_enable(struct pwm_chip *chip, struct pwm_device *pwm)
{
struct ecap_pwm_chip *pc = to_ecap_pwm_chip(chip);
@ -157,6 +178,7 @@ static void ecap_pwm_free(struct pwm_chip *chip, struct pwm_device *pwm)
static const struct pwm_ops ecap_pwm_ops = {
.free = ecap_pwm_free,
.config = ecap_pwm_config,
.set_polarity = ecap_pwm_set_polarity,
.enable = ecap_pwm_enable,
.disable = ecap_pwm_disable,
.owner = THIS_MODULE,

75
drivers/pwm/pwm-tiehrpwm.c
View File

@ -81,6 +81,15 @@
#define AQCTL_ZRO_FRCHIGH BIT(1)
#define AQCTL_ZRO_FRCTOGGLE (BIT(1) | BIT(0))
#define AQCTL_CHANA_POLNORMAL (AQCTL_CAU_FRCLOW | AQCTL_PRD_FRCHIGH | \
AQCTL_ZRO_FRCHIGH)
#define AQCTL_CHANA_POLINVERSED (AQCTL_CAU_FRCHIGH | AQCTL_PRD_FRCLOW | \
AQCTL_ZRO_FRCLOW)
#define AQCTL_CHANB_POLNORMAL (AQCTL_CBU_FRCLOW | AQCTL_PRD_FRCHIGH | \
AQCTL_ZRO_FRCHIGH)
#define AQCTL_CHANB_POLINVERSED (AQCTL_CBU_FRCHIGH | AQCTL_PRD_FRCLOW | \
AQCTL_ZRO_FRCLOW)
#define AQSFRC_RLDCSF_MASK (BIT(7) | BIT(6))
#define AQSFRC_RLDCSF_ZRO 0
#define AQSFRC_RLDCSF_PRD BIT(6)
@ -105,6 +114,7 @@ struct ehrpwm_pwm_chip {
unsigned int clk_rate;
void __iomem *mmio_base;
unsigned long period_cycles[NUM_PWM_CHANNEL];
enum pwm_polarity polarity[NUM_PWM_CHANNEL];
};
static inline struct ehrpwm_pwm_chip *to_ehrpwm_pwm_chip(struct pwm_chip *chip)
@ -165,39 +175,37 @@ static int set_prescale_div(unsigned long rqst_prescaler,
return 1;
}
static void configure_chans(struct ehrpwm_pwm_chip *pc, int chan,
unsigned long duty_cycles)
static void configure_polarity(struct ehrpwm_pwm_chip *pc, int chan)
{
int cmp_reg, aqctl_reg;
int aqctl_reg;
unsigned short aqctl_val, aqctl_mask;
/*
* Channels can be configured from action qualifier module.
* Channel 0 configured with compare A register and for
* up-counter mode.
* Channel 1 configured with compare B register and for
* up-counter mode.
* Configure PWM output to HIGH/LOW level on counter
* reaches compare register value and LOW/HIGH level
* on counter value reaches period register value and
* zero value on counter
*/
if (chan == 1) {
aqctl_reg = AQCTLB;
cmp_reg = CMPB;
/* Configure PWM Low from compare B value */
aqctl_val = AQCTL_CBU_FRCLOW;
aqctl_mask = AQCTL_CBU_MASK;
if (pc->polarity[chan] == PWM_POLARITY_INVERSED)
aqctl_val = AQCTL_CHANB_POLINVERSED;
else
aqctl_val = AQCTL_CHANB_POLNORMAL;
} else {
cmp_reg = CMPA;
aqctl_reg = AQCTLA;
/* Configure PWM Low from compare A value*/
aqctl_val = AQCTL_CAU_FRCLOW;
aqctl_mask = AQCTL_CAU_MASK;
if (pc->polarity[chan] == PWM_POLARITY_INVERSED)
aqctl_val = AQCTL_CHANA_POLINVERSED;
else
aqctl_val = AQCTL_CHANA_POLNORMAL;
}
/* Configure PWM High from period value and zero value */
aqctl_val |= AQCTL_PRD_FRCHIGH | AQCTL_ZRO_FRCHIGH;
aqctl_mask |= AQCTL_PRD_MASK | AQCTL_ZRO_MASK;
ehrpwm_modify(pc->mmio_base, aqctl_reg, aqctl_mask, aqctl_val);
ehrpwm_write(pc->mmio_base, cmp_reg, duty_cycles);
ehrpwm_modify(pc->mmio_base, aqctl_reg, aqctl_mask, aqctl_val);
}
/*
@ -211,9 +219,9 @@ static int ehrpwm_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
unsigned long long c;
unsigned long period_cycles, duty_cycles;
unsigned short ps_divval, tb_divval;
int i;
int i, cmp_reg;
if (period_ns < 0 || duty_ns < 0 || period_ns > NSEC_PER_SEC)
if (period_ns > NSEC_PER_SEC)
return -ERANGE;
c = pc->clk_rate;
@ -278,12 +286,29 @@ static int ehrpwm_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
ehrpwm_modify(pc->mmio_base, TBCTL, TBCTL_CTRMODE_MASK,
TBCTL_CTRMODE_UP);
/* Configure the channel for duty cycle */
configure_chans(pc, pwm->hwpwm, duty_cycles);
if (pwm->hwpwm == 1)
/* Channel 1 configured with compare B register */
cmp_reg = CMPB;
else
/* Channel 0 configured with compare A register */
cmp_reg = CMPA;
ehrpwm_write(pc->mmio_base, cmp_reg, duty_cycles);
pm_runtime_put_sync(chip->dev);
return 0;
}
static int ehrpwm_pwm_set_polarity(struct pwm_chip *chip,
struct pwm_device *pwm, enum pwm_polarity polarity)
{
struct ehrpwm_pwm_chip *pc = to_ehrpwm_pwm_chip(chip);
/* Configuration of polarity in hardware delayed, do at enable */
pc->polarity[pwm->hwpwm] = polarity;
return 0;
}
static int ehrpwm_pwm_enable(struct pwm_chip *chip, struct pwm_device *pwm)
{
struct ehrpwm_pwm_chip *pc = to_ehrpwm_pwm_chip(chip);
@ -307,6 +332,9 @@ static int ehrpwm_pwm_enable(struct pwm_chip *chip, struct pwm_device *pwm)
ehrpwm_modify(pc->mmio_base, AQCSFRC, aqcsfrc_mask, aqcsfrc_val);
/* Channels polarity can be configured from action qualifier module */
configure_polarity(pc, pwm->hwpwm);
/* Enable time counter for free_run */
ehrpwm_modify(pc->mmio_base, TBCTL, TBCTL_RUN_MASK, TBCTL_FREE_RUN);
return 0;
@ -358,6 +386,7 @@ static void ehrpwm_pwm_free(struct pwm_chip *chip, struct pwm_device *pwm)
static const struct pwm_ops ehrpwm_pwm_ops = {
.free = ehrpwm_pwm_free,
.config = ehrpwm_pwm_config,
.set_polarity = ehrpwm_pwm_set_polarity,
.enable = ehrpwm_pwm_enable,
.disable = ehrpwm_pwm_disable,
.owner = THIS_MODULE,

7
drivers/video/backlight/pwm_bl.c
View File

@ -213,7 +213,7 @@ static int pwm_backlight_probe(struct platform_device *pdev)
pb->exit = data->exit;
pb->dev = &pdev->dev;
pb->pwm = pwm_get(&pdev->dev, NULL);
pb->pwm = devm_pwm_get(&pdev->dev, NULL);
if (IS_ERR(pb->pwm)) {
dev_err(&pdev->dev, "unable to request PWM, trying legacy API\n");
@ -246,7 +246,7 @@ static int pwm_backlight_probe(struct platform_device *pdev)
if (IS_ERR(bl)) {
dev_err(&pdev->dev, "failed to register backlight\n");
ret = PTR_ERR(bl);
goto err_bl;
goto err_alloc;
}
bl->props.brightness = data->dft_brightness;
@ -255,8 +255,6 @@ static int pwm_backlight_probe(struct platform_device *pdev)
platform_set_drvdata(pdev, bl);
return 0;
err_bl:
pwm_put(pb->pwm);
err_alloc:
if (data->exit)
data->exit(&pdev->dev);
@ -271,7 +269,6 @@ static int pwm_backlight_remove(struct platform_device *pdev)
backlight_device_unregister(bl);
pwm_config(pb->pwm, 0, pb->period);
pwm_disable(pb->pwm);
pwm_put(pb->pwm);
if (pb->exit)
pb->exit(&pdev->dev);
return 0;

108
include/linux/pwm.h
View File

@ -1,11 +1,13 @@
#ifndef __LINUX_PWM_H
#define __LINUX_PWM_H
#include <linux/err.h>
#include <linux/of.h>
struct pwm_device;
struct seq_file;
#if IS_ENABLED(CONFIG_PWM) || IS_ENABLED(CONFIG_HAVE_PWM)
/*
* pwm_request - request a PWM device
*/
@ -30,10 +32,47 @@ int pwm_enable(struct pwm_device *pwm);
* pwm_disable - stop a PWM output toggling
*/
void pwm_disable(struct pwm_device *pwm);
#else
static inline struct pwm_device *pwm_request(int pwm_id, const char *label)
{
return ERR_PTR(-ENODEV);
}
static inline void pwm_free(struct pwm_device *pwm)
{
}
static inline int pwm_config(struct pwm_device *pwm, int duty_ns, int period_ns)
{
return -EINVAL;
}
static inline int pwm_enable(struct pwm_device *pwm)
{
return -EINVAL;
}
static inline void pwm_disable(struct pwm_device *pwm)
{
}
#endif
#ifdef CONFIG_PWM
struct pwm_chip;
/**
* enum pwm_polarity - polarity of a PWM signal
* @PWM_POLARITY_NORMAL: a high signal for the duration of the duty-
* cycle, followed by a low signal for the remainder of the pulse
* period
* @PWM_POLARITY_INVERSED: a low signal for the duration of the duty-
* cycle, followed by a high signal for the remainder of the pulse
* period
*/
enum pwm_polarity {
PWM_POLARITY_NORMAL,
PWM_POLARITY_INVERSED,
};
enum {
PWMF_REQUESTED = 1 << 0,
PWMF_ENABLED = 1 << 1,
@ -61,11 +100,17 @@ static inline unsigned int pwm_get_period(struct pwm_device *pwm)
return pwm ? pwm->period : 0;
}
/*
* pwm_set_polarity - configure the polarity of a PWM signal
*/
int pwm_set_polarity(struct pwm_device *pwm, enum pwm_polarity polarity);
/**
* struct pwm_ops - PWM controller operations
* @request: optional hook for requesting a PWM
* @free: optional hook for freeing a PWM
* @config: configure duty cycles and period length for this PWM
* @set_polarity: configure the polarity of this PWM
* @enable: enable PWM output toggling
* @disable: disable PWM output toggling
* @dbg_show: optional routine to show contents in debugfs
@ -79,6 +124,9 @@ struct pwm_ops {
int (*config)(struct pwm_chip *chip,
struct pwm_device *pwm,
int duty_ns, int period_ns);
int (*set_polarity)(struct pwm_chip *chip,
struct pwm_device *pwm,
enum pwm_polarity polarity);
int (*enable)(struct pwm_chip *chip,
struct pwm_device *pwm);
void (*disable)(struct pwm_chip *chip,
@ -113,6 +161,7 @@ struct pwm_chip {
unsigned int of_pwm_n_cells;
};
#if IS_ENABLED(CONFIG_PWM)
int pwm_set_chip_data(struct pwm_device *pwm, void *data);
void *pwm_get_chip_data(struct pwm_device *pwm);
@ -125,6 +174,57 @@ struct pwm_device *pwm_request_from_chip(struct pwm_chip *chip,
struct pwm_device *pwm_get(struct device *dev, const char *consumer);
void pwm_put(struct pwm_device *pwm);
struct pwm_device *devm_pwm_get(struct device *dev, const char *consumer);
void devm_pwm_put(struct device *dev, struct pwm_device *pwm);
#else
static inline int pwm_set_chip_data(struct pwm_device *pwm, void *data)
{
return -EINVAL;
}
static inline void *pwm_get_chip_data(struct pwm_device *pwm)
{
return NULL;
}
static inline int pwmchip_add(struct pwm_chip *chip)
{
return -EINVAL;
}
static inline int pwmchip_remove(struct pwm_chip *chip)
{
return -EINVAL;
}
static inline struct pwm_device *pwm_request_from_chip(struct pwm_chip *chip,
unsigned int index,
const char *label)
{
return ERR_PTR(-ENODEV);
}
static inline struct pwm_device *pwm_get(struct device *dev,
const char *consumer)
{
return ERR_PTR(-ENODEV);
}
static inline void pwm_put(struct pwm_device *pwm)
{
}
static inline struct pwm_device *devm_pwm_get(struct device *dev,
const char *consumer)
{
return ERR_PTR(-ENODEV);
}
static inline void devm_pwm_put(struct device *dev, struct pwm_device *pwm)
{
}
#endif
struct pwm_lookup {
struct list_head list;
const char *provider;
@ -141,8 +241,12 @@ struct pwm_lookup {
.con_id = _con_id, \
}
#if IS_ENABLED(CONFIG_PWM)
void pwm_add_table(struct pwm_lookup *table, size_t num);
#else
static inline void pwm_add_table(struct pwm_lookup *table, size_t num)
{
}
#endif
#endif /* __LINUX_PWM_H */