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[kernel] clean up pwm patches and drivers 

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@32901 3c298f89-4303-0410-b956-a3cf2f4a3e73
master
John Crispin 2012-07-28 20:47:08 +00:00
parent 388d1df961
commit 841bbe2dbd
9 changed files with 28 additions and 885 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

54
package/pwm-gpio-custom/Makefile
View File

@ -1,54 +0,0 @@
#
# Copyright (C) 2010 OpenWrt.org
#
# This is free software, licensed under the GNU General Public License v2.
# See /LICENSE for more information.
#
include $(TOPDIR)/rules.mk
include $(INCLUDE_DIR)/kernel.mk
PKG_NAME:=pwm-gpio-custom
PKG_RELEASE:=1
include $(INCLUDE_DIR)/package.mk
define KernelPackage/pwm-gpio-custom
SUBMENU:=Other modules
TITLE:=Custom GPIO-based PWM device
DEPENDS:=+kmod-pwm-gpio
FILES:=$(PKG_BUILD_DIR)/pwm-gpio-custom.ko
KCONFIG:=
endef
define KernelPackage/pwm-gpio-custom/description
Kernel module to register a custom pwm-gpio platform device.
endef
EXTRA_KCONFIG:= \
CONFIG_PWM_GPIO_CUSTOM=m
EXTRA_CFLAGS:= \
$(patsubst CONFIG_%, -DCONFIG_%=1, $(patsubst %=m,%,$(filter %=m,$(EXTRA_KCONFIG)))) \
$(patsubst CONFIG_%, -DCONFIG_%=1, $(patsubst %=y,%,$(filter %=y,$(EXTRA_KCONFIG))))
MAKE_OPTS:= \
ARCH="$(LINUX_KARCH)" \
CROSS_COMPILE="$(TARGET_CROSS)" \
SUBDIRS="$(PKG_BUILD_DIR)" \
EXTRA_CFLAGS="$(EXTRA_CFLAGS)" \
$(EXTRA_KCONFIG)
define Build/Prepare
mkdir -p $(PKG_BUILD_DIR)
$(CP) ./src/* $(PKG_BUILD_DIR)/
endef
define Build/Compile
$(MAKE) -C "$(LINUX_DIR)" \
$(MAKE_OPTS) \
modules
endef
$(eval $(call KernelPackage,pwm-gpio-custom))

4
package/pwm-gpio-custom/src/Kconfig
View File

@ -1,4 +0,0 @@
config PWM_MASTER_GPIO_CUSTOM
tristate "Custom GPIO-based PWM driver"
depends on GENERIC_GPIO
select PWM_GENERIC_GPIO

1
package/pwm-gpio-custom/src/Makefile
View File

@ -1 +0,0 @@
obj-${CONFIG_PWM_GPIO_CUSTOM} += pwm-gpio-custom.o

218
package/pwm-gpio-custom/src/pwm-gpio-custom.c
View File

@ -1,218 +0,0 @@
/*
* Custom GPIO-based PWM driver
*
* Based on w1-gpio-custom by Copyright (C) 2007 Gabor Juhos <juhosg at openwrt.org>
* Copyright (C) 2010 Claudio Mignanti <c.mignanti@gmail.com >
*
* 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.
*
* ---------------------------------------------------------------------------
*
* The behaviour of this driver can be altered by setting some parameters
* from the insmod command line.
*
* The following parameters are adjustable:
*
* bus0 These four arguments must be arrays
* bus1
* .....
* bus10 <id>,<pin>,<od>
*
* where:
*
* <id> ID to used as device_id for the corresponding bus (required)
* <pin> GPIO pin ID for PWM channel (required)
* *
* If this driver is built into the kernel, you can use the following kernel
* command line parameters, with the same values as the corresponding module
* parameters listed above:
*
* pwm-gpio-custom.bus0
* pwm-gpio-custom.bus1
* pwm-gpio-custom.bunN
* pwm-gpio-custom.bus10
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/platform_device.h>
#include <linux/workqueue.h>
#include <linux/pwm/pwm.h>
#define DRV_NAME "pwm-gpio-custom"
#define DRV_DESC "Custom GPIO-based pwm driver"
#define DRV_VERSION "0.1.0"
#define PFX DRV_NAME ": "
#define BUS_PARAM_ID 0
#define BUS_PARAM_PIN 1
#define BUS_PARAM_REQUIRED 2
#define BUS_PARAM_COUNT 2
#define BUS_COUNT_MAX 10
static unsigned int bus0[BUS_PARAM_COUNT] __initdata;
static unsigned int bus1[BUS_PARAM_COUNT] __initdata;
static unsigned int bus2[BUS_PARAM_COUNT] __initdata;
static unsigned int bus3[BUS_PARAM_COUNT] __initdata;
static unsigned int bus4[BUS_PARAM_COUNT] __initdata;
static unsigned int bus5[BUS_PARAM_COUNT] __initdata;
static unsigned int bus6[BUS_PARAM_COUNT] __initdata;
static unsigned int bus7[BUS_PARAM_COUNT] __initdata;
static unsigned int bus8[BUS_PARAM_COUNT] __initdata;
static unsigned int bus9[BUS_PARAM_COUNT] __initdata;
static unsigned int bus_nump[BUS_COUNT_MAX] __initdata;
#define BUS_PARM_DESC " config -> id,pin"
module_param_array(bus0, uint, &bus_nump[0], 0);
MODULE_PARM_DESC(bus0, "bus0" BUS_PARM_DESC);
module_param_array(bus1, uint, &bus_nump[1], 0);
MODULE_PARM_DESC(bus1, "bus1" BUS_PARM_DESC);
module_param_array(bus2, uint, &bus_nump[2], 0);
MODULE_PARM_DESC(bus2, "bus2" BUS_PARM_DESC);
module_param_array(bus3, uint, &bus_nump[3], 0);
MODULE_PARM_DESC(bus3, "bus3" BUS_PARM_DESC);
module_param_array(bus4, uint, &bus_nump[4], 0);
MODULE_PARM_DESC(bus4, "bus4" BUS_PARM_DESC);
module_param_array(bus5, uint, &bus_nump[5], 0);
MODULE_PARM_DESC(bus5, "bus5" BUS_PARM_DESC);
module_param_array(bus6, uint, &bus_nump[6], 0);
MODULE_PARM_DESC(bus6, "bus6" BUS_PARM_DESC);
module_param_array(bus7, uint, &bus_nump[7], 0);
MODULE_PARM_DESC(bus7, "bus7" BUS_PARM_DESC);
module_param_array(bus8, uint, &bus_nump[8], 0);
MODULE_PARM_DESC(bus8, "bus8" BUS_PARM_DESC);
module_param_array(bus9, uint, &bus_nump[9], 0);
MODULE_PARM_DESC(bus9, "bus9" BUS_PARM_DESC);
static struct platform_device *devices[BUS_COUNT_MAX];
static unsigned int nr_devices;
static void pwm_gpio_custom_cleanup(void)
{
int i;
for (i = 0; i < nr_devices; i++)
if (devices[i])
platform_device_put(devices[i]);
}
static int __init pwm_gpio_custom_add_one(unsigned int id, unsigned int *params)
{
struct platform_device *pdev;
struct gpio_pwm_platform_data pdata;
int err;
if (!bus_nump[id])
return 0;
if (bus_nump[id] < BUS_PARAM_REQUIRED) {
printk(KERN_ERR PFX "not enough parameters for bus%d\n", id);
err = -EINVAL;
goto err;
}
pdev = platform_device_alloc("gpio_pwm", params[BUS_PARAM_ID]);
if (!pdev) {
err = -ENOMEM;
goto err;
}
pdata.gpio = params[BUS_PARAM_PIN];
err = platform_device_add_data(pdev, &pdata, sizeof(pdata));
if (err)
goto err_put;
err = platform_device_add(pdev);
if (err)
goto err_put;
devices[nr_devices++] = pdev;
return 0;
err_put:
platform_device_put(pdev);
err:
return err;
}
static int __init pwm_gpio_custom_probe(void)
{
int err;
nr_devices = 0;
printk(KERN_INFO DRV_DESC " version " DRV_VERSION "\n");
err = pwm_gpio_custom_add_one(0, bus0);
if (err) goto err;
err = pwm_gpio_custom_add_one(1, bus1);
if (err) goto err;
err = pwm_gpio_custom_add_one(2, bus2);
if (err) goto err;
err = pwm_gpio_custom_add_one(3, bus3);
if (err) goto err;
err = pwm_gpio_custom_add_one(4, bus4);
if (err) goto err;
err = pwm_gpio_custom_add_one(5, bus5);
if (err) goto err;
err = pwm_gpio_custom_add_one(6, bus6);
if (err) goto err;
err = pwm_gpio_custom_add_one(7, bus7);
if (err) goto err;
err = pwm_gpio_custom_add_one(8, bus8);
if (err) goto err;
err = pwm_gpio_custom_add_one(9, bus9);
if (err) goto err;
if (!nr_devices) {
printk(KERN_ERR PFX "no bus parameter(s) specified\n");
err = -ENODEV;
goto err;
}
return 0;
err:
pwm_gpio_custom_cleanup();
return err;
}
#ifdef MODULE
static int __init pwm_gpio_custom_init(void)
{
return pwm_gpio_custom_probe();
}
module_init(pwm_gpio_custom_init);
static void __exit pwm_gpio_custom_exit(void)
{
pwm_gpio_custom_cleanup();
}
module_exit(pwm_gpio_custom_exit);
#else
subsys_initcall(pwm_gpio_custom_probe);
#endif /* MODULE*/
MODULE_LICENSE("GPL v2");
MODULE_AUTHOR("Bifferos <bifferos at yahoo.co.uk >");
MODULE_AUTHOR("Claudio Mignanti <c.mignanti@gmail.com >");
MODULE_DESCRIPTION(DRV_DESC);
MODULE_VERSION(DRV_VERSION);

7
target/linux/at91/modules.mk
View File

@ -24,10 +24,9 @@ define KernelPackage/pwm-atmel
SUBMENU:=$(OTHER_MENU)
TITLE:=PWM on atmel SoC
DEPENDS:=@TARGET_at91
KCONFIG:=CONFIG_GENERIC_PWM \
CONFIG_ATMEL_PWM
FILES:=$(LINUX_DIR)/drivers/pwm/atmel-pwm.ko
AUTOLOAD:=$(call AutoLoad,51,atmel-pwm)
KCONFIG:=CONFIG_ATMEL_PWM
FILES:=$(LINUX_DIR)/drivers/misc/atmel_pwm.ko
AUTOLOAD:=$(call AutoLoad,51,atmel_pwm)
endef
define KernelPackage/pwm-atmel/description

11
target/linux/generic/files/drivers/pwm/Kconfig
View File

@ -11,17 +11,6 @@ menuconfig GENERIC_PWM
if GENERIC_PWM
config ATMEL_PWM
tristate "Atmel AT32/AT91 PWM support"
depends on AVR32 || ARCH_AT91
help
This option enables device driver support for the PWMC
peripheral channels found on certain Atmel processors.
Pulse Width Modulation is used many for purposes, including
software controlled power-efficient backlights on LCD
displays, motor control, and waveform generation. If
unsure, say N.
config GPIO_PWM
tristate "PWM emulation using GPIO"
help

1
target/linux/generic/files/drivers/pwm/Makefile
View File

@ -2,5 +2,4 @@
# Makefile for pwm devices
#
obj-$(CONFIG_GENERIC_PWM) := pwm.o
obj-$(CONFIG_ATMEL_PWM) += atmel-pwm.o
obj-$(CONFIG_GPIO_PWM) += gpio-pwm.o

592
target/linux/generic/files/drivers/pwm/atmel-pwm.c
View File

@ -1,592 +0,0 @@
/*
* drivers/pwm/atmel-pwm.c
*
* Copyright (C) 2010 Bill Gatliff <bgat@billgatliff.com>
* Copyright (C) 2007 David Brownell
*
* This program is free software; you may redistribute and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307
* USA
*/
#include <linux/module.h>
#include <linux/init.h>
#include <linux/clk.h>
#include <linux/err.h>
#include <linux/io.h>
#include <linux/interrupt.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/pwm/pwm.h>
enum {
/* registers common to the PWMC peripheral */
PWMC_MR = 0,
PWMC_ENA = 4,
PWMC_DIS = 8,
PWMC_SR = 0xc,
PWMC_IER = 0x10,
PWMC_IDR = 0x14,
PWMC_IMR = 0x18,
PWMC_ISR = 0x1c,
/* registers per each PWMC channel */
PWMC_CMR = 0,
PWMC_CDTY = 4,
PWMC_CPRD = 8,
PWMC_CCNT = 0xc,
PWMC_CUPD = 0x10,
/* how to find each channel */
PWMC_CHAN_BASE = 0x200,
PWMC_CHAN_STRIDE = 0x20,
/* CMR bits of interest */
PWMC_CMR_CPD = 10,
PWMC_CMR_CPOL = 9,
PWMC_CMR_CALG = 8,
PWMC_CMR_CPRE_MASK = 0xf,
};
struct atmel_pwm {
struct pwm_device pwm;
spinlock_t lock;
void __iomem *iobase;
struct clk *clk;
u32 *sync_mask;
int irq;
u32 ccnt_mask;
};
static inline struct atmel_pwm *to_atmel_pwm(const struct pwm_channel *p)
{
return container_of(p->pwm, struct atmel_pwm, pwm);
}
static inline void
pwmc_writel(const struct atmel_pwm *p,
unsigned offset, u32 val)
{
__raw_writel(val, p->iobase + offset);
}
static inline u32
pwmc_readl(const struct atmel_pwm *p,
unsigned offset)
{
return __raw_readl(p->iobase + offset);
}
static inline void
pwmc_chan_writel(const struct pwm_channel *p,
u32 offset, u32 val)
{
const struct atmel_pwm *ap = to_atmel_pwm(p);
if (PWMC_CMR == offset)
val &= ((1 << PWMC_CMR_CPD)
| (1 << PWMC_CMR_CPOL)
| (1 << PWMC_CMR_CALG)
| (PWMC_CMR_CPRE_MASK));
else
val &= ap->ccnt_mask;
pwmc_writel(ap, offset + PWMC_CHAN_BASE
+ (p->chan * PWMC_CHAN_STRIDE), val);
}
static inline u32
pwmc_chan_readl(const struct pwm_channel *p,
u32 offset)
{
const struct atmel_pwm *ap = to_atmel_pwm(p);
return pwmc_readl(ap, offset + PWMC_CHAN_BASE
+ (p->chan * PWMC_CHAN_STRIDE));
}
static inline int
__atmel_pwm_is_on(struct pwm_channel *p)
{
struct atmel_pwm *ap = to_atmel_pwm(p);
return (pwmc_readl(ap, PWMC_SR) & (1 << p->chan)) ? 1 : 0;
}
static inline void
__atmel_pwm_unsynchronize(struct pwm_channel *p,
struct pwm_channel *to_p)
{
const struct atmel_pwm *ap = to_atmel_pwm(p);
int wchan;
if (to_p) {
ap->sync_mask[p->chan] &= ~(1 << to_p->chan);
ap->sync_mask[to_p->chan] &= ~(1 << p->chan);
goto done;
}
ap->sync_mask[p->chan] = 0;
for (wchan = 0; wchan < ap->pwm.nchan; wchan++)
ap->sync_mask[wchan] &= ~(1 << p->chan);
done:
dev_dbg(p->pwm->dev, "sync_mask %x\n", ap->sync_mask[p->chan]);
}
static inline void
__atmel_pwm_synchronize(struct pwm_channel *p,
struct pwm_channel *to_p)
{
const struct atmel_pwm *ap = to_atmel_pwm(p);
if (!to_p)
return;
ap->sync_mask[p->chan] |= (1 << to_p->chan);
ap->sync_mask[to_p->chan] |= (1 << p->chan);
dev_dbg(p->pwm->dev, "sync_mask %x\n", ap->sync_mask[p->chan]);
}
static inline void
__atmel_pwm_stop(struct pwm_channel *p)
{
struct atmel_pwm *ap = to_atmel_pwm(p);
u32 chid = 1 << p->chan;
pwmc_writel(ap, PWMC_DIS, ap->sync_mask[p->chan] | chid);
}
static inline void
__atmel_pwm_start(struct pwm_channel *p)
{
struct atmel_pwm *ap = to_atmel_pwm(p);
u32 chid = 1 << p->chan;
pwmc_writel(ap, PWMC_ENA, ap->sync_mask[p->chan] | chid);
}
static int
atmel_pwm_synchronize(struct pwm_channel *p,
struct pwm_channel *to_p)
{
unsigned long flags;
spin_lock_irqsave(&p->lock, flags);
__atmel_pwm_synchronize(p, to_p);
spin_unlock_irqrestore(&p->lock, flags);
return 0;
}
static int
atmel_pwm_unsynchronize(struct pwm_channel *p,
struct pwm_channel *from_p)
{
unsigned long flags;
spin_lock_irqsave(&p->lock, flags);
__atmel_pwm_unsynchronize(p, from_p);
spin_unlock_irqrestore(&p->lock, flags);
return 0;
}
static inline int
__atmel_pwm_config_polarity(struct pwm_channel *p,
struct pwm_channel_config *c)
{
u32 cmr = pwmc_chan_readl(p, PWMC_CMR);
if (c->polarity)
cmr &= ~BIT(PWMC_CMR_CPOL);
else
cmr |= BIT(PWMC_CMR_CPOL);
pwmc_chan_writel(p, PWMC_CMR, cmr);
p->active_high = c->polarity ? 1 : 0;
dev_dbg(p->pwm->dev, "polarity %d\n", c->polarity);
return 0;
}
static inline int
__atmel_pwm_config_duty_ticks(struct pwm_channel *p,
struct pwm_channel_config *c)
{
u32 cmr, cprd, cpre, cdty;
cmr = pwmc_chan_readl(p, PWMC_CMR);
cprd = pwmc_chan_readl(p, PWMC_CPRD);
cpre = cmr & PWMC_CMR_CPRE_MASK;
cmr &= ~BIT(PWMC_CMR_CPD);
cdty = cprd - (c->duty_ticks >> cpre);
p->duty_ticks = c->duty_ticks;
if (__atmel_pwm_is_on(p)) {
pwmc_chan_writel(p, PWMC_CMR, cmr);
pwmc_chan_writel(p, PWMC_CUPD, cdty);
} else
pwmc_chan_writel(p, PWMC_CDTY, cdty);
dev_dbg(p->pwm->dev, "duty_ticks = %lu cprd = %x"
" cdty = %x cpre = %x\n", p->duty_ticks,
cprd, cdty, cpre);
return 0;
}
static inline int
__atmel_pwm_config_period_ticks(struct pwm_channel *p,
struct pwm_channel_config *c)
{
u32 cmr, cprd, cpre;
cpre = fls(c->period_ticks);
if (cpre < 16)
cpre = 0;
else {
cpre -= 15;
if (cpre > 10)
return -EINVAL;
}
cmr = pwmc_chan_readl(p, PWMC_CMR);
cmr &= ~PWMC_CMR_CPRE_MASK;
cmr |= cpre;
cprd = c->period_ticks >> cpre;
pwmc_chan_writel(p, PWMC_CMR, cmr);
pwmc_chan_writel(p, PWMC_CPRD, cprd);
p->period_ticks = c->period_ticks;
dev_dbg(p->pwm->dev, "period_ticks = %lu cprd = %x cpre = %x\n",
p->period_ticks, cprd, cpre);
return 0;
}
static int
atmel_pwm_config_nosleep(struct pwm_channel *p,
struct pwm_channel_config *c)
{
int ret = 0;
unsigned long flags;
spin_lock_irqsave(&p->lock, flags);
switch (c->config_mask) {
case PWM_CONFIG_DUTY_TICKS:
__atmel_pwm_config_duty_ticks(p, c);
break;
case PWM_CONFIG_STOP:
__atmel_pwm_stop(p);
break;
case PWM_CONFIG_START:
__atmel_pwm_start(p);
break;
case PWM_CONFIG_POLARITY:
__atmel_pwm_config_polarity(p, c);
break;
default:
ret = -EINVAL;
break;
}
spin_unlock_irqrestore(&p->lock, flags);
return ret;
}
static int
atmel_pwm_stop_sync(struct pwm_channel *p)
{
struct atmel_pwm *ap = container_of(p->pwm, struct atmel_pwm, pwm);
int ret;
int was_on = __atmel_pwm_is_on(p);
if (was_on) {
do {
init_completion(&p->complete);
set_bit(FLAG_STOP, &p->flags);
pwmc_writel(ap, PWMC_IER, 1 << p->chan);
dev_dbg(p->pwm->dev, "waiting on stop_sync completion...\n");
ret = wait_for_completion_interruptible(&p->complete);
dev_dbg(p->pwm->dev, "stop_sync complete (%d)\n", ret);
if (ret)
return ret;
} while (p->flags & BIT(FLAG_STOP));
}
return was_on;
}
static int
atmel_pwm_config(struct pwm_channel *p,
struct pwm_channel_config *c)
{
int was_on = 0;
if (p->pwm->config_nosleep) {
if (!p->pwm->config_nosleep(p, c))
return 0;
}
might_sleep();
dev_dbg(p->pwm->dev, "config_mask %x\n", c->config_mask);
was_on = atmel_pwm_stop_sync(p);
if (was_on < 0)
return was_on;
if (c->config_mask & PWM_CONFIG_PERIOD_TICKS) {
__atmel_pwm_config_period_ticks(p, c);
if (!(c->config_mask & PWM_CONFIG_DUTY_TICKS)) {
struct pwm_channel_config d = {
.config_mask = PWM_CONFIG_DUTY_TICKS,
.duty_ticks = p->duty_ticks,
};
__atmel_pwm_config_duty_ticks(p, &d);
}
}
if (c->config_mask & PWM_CONFIG_DUTY_TICKS)
__atmel_pwm_config_duty_ticks(p, c);
if (c->config_mask & PWM_CONFIG_POLARITY)
__atmel_pwm_config_polarity(p, c);
if ((c->config_mask & PWM_CONFIG_START)
|| (was_on && !(c->config_mask & PWM_CONFIG_STOP)))
__atmel_pwm_start(p);
return 0;
}
static void
__atmel_pwm_set_callback(struct pwm_channel *p,
pwm_callback_t callback)
{
struct atmel_pwm *ap = container_of(p->pwm, struct atmel_pwm, pwm);
p->callback = callback;
pwmc_writel(ap, p->callback ? PWMC_IER : PWMC_IDR, 1 << p->chan);
}
static int
atmel_pwm_set_callback(struct pwm_channel *p,
pwm_callback_t callback)
{
struct atmel_pwm *ap = to_atmel_pwm(p);
unsigned long flags;
spin_lock_irqsave(&ap->lock, flags);
__atmel_pwm_set_callback(p, callback);
spin_unlock_irqrestore(&ap->lock, flags);
return 0;
}
static int
atmel_pwm_request(struct pwm_channel *p)
{
struct atmel_pwm *ap = to_atmel_pwm(p);
unsigned long flags;
spin_lock_irqsave(&p->lock, flags);
clk_enable(ap->clk);
p->tick_hz = clk_get_rate(ap->clk);
__atmel_pwm_unsynchronize(p, NULL);
__atmel_pwm_stop(p);
spin_unlock_irqrestore(&p->lock, flags);
return 0;
}
static void
atmel_pwm_free(struct pwm_channel *p)
{
struct atmel_pwm *ap = to_atmel_pwm(p);
clk_disable(ap->clk);
}
static irqreturn_t
atmel_pwmc_irq(int irq, void *data)
{
struct atmel_pwm *ap = data;
struct pwm_channel *p;
u32 isr;
int chid;
unsigned long flags;
spin_lock_irqsave(&ap->lock, flags);
isr = pwmc_readl(ap, PWMC_ISR);
for (chid = 0; isr; chid++, isr >>= 1) {
p = &ap->pwm.channels[chid];
if (isr & 1) {
if (p->callback)
p->callback(p);
if (p->flags & BIT(FLAG_STOP)) {
__atmel_pwm_stop(p);
clear_bit(FLAG_STOP, &p->flags);
}
complete_all(&p->complete);
}
}
spin_unlock_irqrestore(&ap->lock, flags);
return IRQ_HANDLED;
}
static int __devinit
atmel_pwmc_probe(struct platform_device *pdev)
{
struct atmel_pwm *ap;
struct resource *r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
int ret = 0;
ap = kzalloc(sizeof(*ap), GFP_KERNEL);
if (!ap) {
ret = -ENOMEM;
goto err_atmel_pwm_alloc;
}
spin_lock_init(&ap->lock);
platform_set_drvdata(pdev, ap);
ap->pwm.dev = &pdev->dev;
ap->pwm.bus_id = dev_name(&pdev->dev);
ap->pwm.nchan = 4; /* TODO: true only for SAM9263 and AP7000 */
ap->ccnt_mask = 0xffffUL; /* TODO: true only for SAM9263 */
ap->sync_mask = kzalloc(ap->pwm.nchan * sizeof(u32), GFP_KERNEL);
if (!ap->sync_mask) {
ret = -ENOMEM;
goto err_alloc_sync_masks;
}
ap->pwm.owner = THIS_MODULE;
ap->pwm.request = atmel_pwm_request;
ap->pwm.free = atmel_pwm_free;
ap->pwm.config_nosleep = atmel_pwm_config_nosleep;
ap->pwm.config = atmel_pwm_config;
ap->pwm.synchronize = atmel_pwm_synchronize;
ap->pwm.unsynchronize = atmel_pwm_unsynchronize;
ap->pwm.set_callback = atmel_pwm_set_callback;
ap->clk = clk_get(&pdev->dev, "pwm_clk");
if (PTR_ERR(ap->clk)) {
ret = -ENODEV;
goto err_clk_get;
}
ap->iobase = ioremap_nocache(r->start, r->end - r->start + 1);
if (!ap->iobase) {
ret = -ENODEV;
goto err_ioremap;
}
clk_enable(ap->clk);
pwmc_writel(ap, PWMC_DIS, -1);
pwmc_writel(ap, PWMC_IDR, -1);
clk_disable(ap->clk);
ap->irq = platform_get_irq(pdev, 0);
if (ap->irq != -ENXIO) {
ret = request_irq(ap->irq, atmel_pwmc_irq, 0,
ap->pwm.bus_id, ap);
if (ret)
goto err_request_irq;
}
ret = pwm_register(&ap->pwm);
if (ret)
goto err_pwm_register;
return 0;
err_pwm_register:
if (ap->irq != -ENXIO)
free_irq(ap->irq, ap);
err_request_irq:
iounmap(ap->iobase);
err_ioremap:
clk_put(ap->clk);
err_clk_get:
platform_set_drvdata(pdev, NULL);
err_alloc_sync_masks:
kfree(ap);
err_atmel_pwm_alloc:
return ret;
}
static int __devexit
atmel_pwmc_remove(struct platform_device *pdev)
{
struct atmel_pwm *ap = platform_get_drvdata(pdev);
int ret;
/* TODO: what can we do if this fails? */
ret = pwm_unregister(&ap->pwm);
clk_enable(ap->clk);
pwmc_writel(ap, PWMC_IDR, -1);
pwmc_writel(ap, PWMC_DIS, -1);
clk_disable(ap->clk);
if (ap->irq != -ENXIO)
free_irq(ap->irq, ap);
clk_put(ap->clk);
iounmap(ap->iobase);
kfree(ap);
return 0;
}
static struct platform_driver atmel_pwm_driver = {
.driver = {
.name = "atmel_pwmc",
.owner = THIS_MODULE,
},
.probe = atmel_pwmc_probe,
.remove = __devexit_p(atmel_pwmc_remove),
};
static int __init atmel_pwm_init(void)
{
return platform_driver_register(&atmel_pwm_driver);
}
module_init(atmel_pwm_init);
static void __exit atmel_pwm_exit(void)
{
platform_driver_unregister(&atmel_pwm_driver);
}
module_exit(atmel_pwm_exit);
MODULE_AUTHOR("Bill Gatliff <bgat@billgatliff.com>");
MODULE_DESCRIPTION("Driver for Atmel PWMC peripheral");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:atmel_pwmc");

25
target/linux/generic/patches-3.3/865-gpiopwm.patch Normal file
View File

@ -0,0 +1,25 @@
Index: linux-3.3.8/drivers/Kconfig
===================================================================
--- linux-3.3.8.orig/drivers/Kconfig 2012-06-01 09:16:13.000000000 +0200
+++ linux-3.3.8/drivers/Kconfig 2012-07-28 22:16:32.894397322 +0200
@@ -60,6 +60,8 @@
source "drivers/gpio/Kconfig"
+source "drivers/pwm/Kconfig"
+
source "drivers/w1/Kconfig"
source "drivers/power/Kconfig"
Index: linux-3.3.8/drivers/Makefile
===================================================================
--- linux-3.3.8.orig/drivers/Makefile 2012-06-01 09:16:13.000000000 +0200
+++ linux-3.3.8/drivers/Makefile 2012-07-28 22:16:17.990396684 +0200
@@ -8,6 +8,7 @@
# GPIO must come after pinctrl as gpios may need to mux pins etc
obj-y += pinctrl/
obj-y += gpio/
+obj-$(CONFIG_GENERIC_PWM) += pwm/
obj-$(CONFIG_PCI) += pci/
obj-$(CONFIG_PARISC) += parisc/
obj-$(CONFIG_RAPIDIO) += rapidio/