diff options
Diffstat (limited to 'target/linux/xburst/patches-2.6.35/011-pwm.patch')
| -rw-r--r-- | target/linux/xburst/patches-2.6.35/011-pwm.patch | 197 |
1 files changed, 0 insertions, 197 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 deleted file mode 100644 index 3c8336b..0000000 --- a/target/linux/xburst/patches-2.6.35/011-pwm.patch +++ /dev/null @@ -1,197 +0,0 @@ -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); |