[xburst] Add 2.6.35 patches

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@22463 3c298f89-4303-0410-b956-a3cf2f4a3e73

1 files changed, 197 insertions, 0 deletions

diff --git a/target/linux/xburst/patches-2.6.35/011-pwm.patch b/target/linux/xburst/patches-2.6.35/011-pwm.patch
new file mode 100644
index 0000000000..3c8336baae
--- /dev/null
+++ b/target/linux/xburst/patches-2.6.35/011-pwm.patch
@@ -0,0 +1,197 @@
+From 5cd5a44b94b451ecaf593bb49919cfbb51ccb622 Mon Sep 17 00:00:00 2001
+From: Lars-Peter Clausen <lars@metafoo.de>
+Date: Sat, 17 Jul 2010 11:12:20 +0000
+Subject: [PATCH] MIPS: JZ4740: Add PWM support
+
+Add support for the PWM part of the timer unit on a JZ4740 SoC.
+
+Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
+Cc: linux-mips@linux-mips.org
+Cc: linux-kernel@vger.kernel.org
+Patchwork: https://patchwork.linux-mips.org/patch/1468/
+Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
+---
+ arch/mips/jz4740/pwm.c |  177 ++++++++++++++++++++++++++++++++++++++++++++++++
+ 1 files changed, 177 insertions(+), 0 deletions(-)
+ create mode 100644 arch/mips/jz4740/pwm.c
+
+--- /dev/null
++++ b/arch/mips/jz4740/pwm.c
+@@ -0,0 +1,177 @@
++/*
++ *  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);