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author | Thierry Reding <thierry.reding@avionic-design.de> | 2012-08-22 10:01:24 +0200 |
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committer | Thierry Reding <thierry.reding@avionic-design.de> | 2012-10-05 20:56:42 +0200 |
commit | f6b8a5700057cc1b531c2f9b7806428a6f83b467 (patch) | |
tree | bf019c60548d37c21c8f1ca00a7968a425ea53da /arch/mips/jz4740 | |
parent | 46a98765133bd880916415d431698797010d4ba8 (diff) | |
download | linux-stable-f6b8a5700057cc1b531c2f9b7806428a6f83b467.tar.gz linux-stable-f6b8a5700057cc1b531c2f9b7806428a6f83b467.tar.bz2 linux-stable-f6b8a5700057cc1b531c2f9b7806428a6f83b467.zip |
pwm: Add Ingenic JZ4740 support
This commit moves the driver to drivers/pwm and converts it to the new
PWM framework.
Signed-off-by: Thierry Reding <thierry.reding@avionic-design.de>
Acked-by: Lars-Peter Clausen <lars@metafoo.de>
Tested-by: Lars-Peter Clausen <lars@metafoo.de>
Acked-by: Ralf Baechle <ralf@linux-mips.org>
Diffstat (limited to 'arch/mips/jz4740')
-rw-r--r-- | arch/mips/jz4740/Kconfig | 3 | ||||
-rw-r--r-- | arch/mips/jz4740/Makefile | 2 | ||||
-rw-r--r-- | arch/mips/jz4740/board-qi_lb60.c | 1 | ||||
-rw-r--r-- | arch/mips/jz4740/platform.c | 6 | ||||
-rw-r--r-- | arch/mips/jz4740/pwm.c | 177 |
5 files changed, 8 insertions, 181 deletions
diff --git a/arch/mips/jz4740/Kconfig b/arch/mips/jz4740/Kconfig index 3e7141f0746c..468903053883 100644 --- a/arch/mips/jz4740/Kconfig +++ b/arch/mips/jz4740/Kconfig @@ -7,6 +7,3 @@ config JZ4740_QI_LB60 bool "Qi Hardware Ben NanoNote" endchoice - -config HAVE_PWM - bool diff --git a/arch/mips/jz4740/Makefile b/arch/mips/jz4740/Makefile index e44abea9c209..63bad0e491d0 100644 --- a/arch/mips/jz4740/Makefile +++ b/arch/mips/jz4740/Makefile @@ -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 diff --git a/arch/mips/jz4740/board-qi_lb60.c b/arch/mips/jz4740/board-qi_lb60.c index 9a3d9de4d04e..43d964d36288 100644 --- a/arch/mips/jz4740/board-qi_lb60.c +++ b/arch/mips/jz4740/board-qi_lb60.c @@ -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, diff --git a/arch/mips/jz4740/platform.c b/arch/mips/jz4740/platform.c index e342ed4cbd43..6d14dcdbd908 100644 --- a/arch/mips/jz4740/platform.c +++ b/arch/mips/jz4740/platform.c @@ -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, +}; diff --git a/arch/mips/jz4740/pwm.c b/arch/mips/jz4740/pwm.c deleted file mode 100644 index a26a6faec9a6..000000000000 --- a/arch/mips/jz4740/pwm.c +++ /dev/null @@ -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); |