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>hifive-unleashed-5.1
Thierry Reding
parent
46a9876513
commit
f6b8a57000
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@ -31,6 +31,7 @@ extern struct platform_device jz4740_pcm_device;
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extern struct platform_device jz4740_codec_device;
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extern struct platform_device jz4740_adc_device;
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extern struct platform_device jz4740_wdt_device;
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extern struct platform_device jz4740_pwm_device;
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void jz4740_serial_device_register(void);
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@ -7,6 +7,3 @@ config JZ4740_QI_LB60
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bool "Qi Hardware Ben NanoNote"
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endchoice
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config HAVE_PWM
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bool
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@ -5,7 +5,7 @@
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# Object file lists.
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obj-y += prom.o irq.o time.o reset.o setup.o dma.o \
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gpio.o clock.o platform.o timer.o pwm.o serial.o
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gpio.o clock.o platform.o timer.o serial.o
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obj-$(CONFIG_DEBUG_FS) += clock-debugfs.o
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@ -437,6 +437,7 @@ static struct platform_device *jz_platform_devices[] __initdata = {
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&jz4740_codec_device,
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&jz4740_rtc_device,
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&jz4740_adc_device,
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&jz4740_pwm_device,
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&qi_lb60_gpio_keys,
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&qi_lb60_pwm_beeper,
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&qi_lb60_charger_device,
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@ -323,3 +323,9 @@ struct platform_device jz4740_wdt_device = {
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.num_resources = ARRAY_SIZE(jz4740_wdt_resources),
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.resource = jz4740_wdt_resources,
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};
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/* PWM */
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struct platform_device jz4740_pwm_device = {
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.name = "jz4740-pwm",
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.id = -1,
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};
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@ -1,177 +0,0 @@
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/*
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* Copyright (C) 2010, Lars-Peter Clausen <lars@metafoo.de>
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* JZ4740 platform PWM support
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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*/
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#include <linux/kernel.h>
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#include <linux/clk.h>
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#include <linux/err.h>
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#include <linux/pwm.h>
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#include <linux/gpio.h>
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#include <asm/mach-jz4740/gpio.h>
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#include "timer.h"
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static struct clk *jz4740_pwm_clk;
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DEFINE_MUTEX(jz4740_pwm_mutex);
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struct pwm_device {
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unsigned int id;
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unsigned int gpio;
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bool used;
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};
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static struct pwm_device jz4740_pwm_list[] = {
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{ 2, JZ_GPIO_PWM2, false },
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{ 3, JZ_GPIO_PWM3, false },
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{ 4, JZ_GPIO_PWM4, false },
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{ 5, JZ_GPIO_PWM5, false },
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{ 6, JZ_GPIO_PWM6, false },
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{ 7, JZ_GPIO_PWM7, false },
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};
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struct pwm_device *pwm_request(int id, const char *label)
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{
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int ret = 0;
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struct pwm_device *pwm;
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if (id < 2 || id > 7 || !jz4740_pwm_clk)
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return ERR_PTR(-ENODEV);
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mutex_lock(&jz4740_pwm_mutex);
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pwm = &jz4740_pwm_list[id - 2];
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if (pwm->used)
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ret = -EBUSY;
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else
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pwm->used = true;
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mutex_unlock(&jz4740_pwm_mutex);
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if (ret)
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return ERR_PTR(ret);
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ret = gpio_request(pwm->gpio, label);
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if (ret) {
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printk(KERN_ERR "Failed to request pwm gpio: %d\n", ret);
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pwm->used = false;
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return ERR_PTR(ret);
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}
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jz_gpio_set_function(pwm->gpio, JZ_GPIO_FUNC_PWM);
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jz4740_timer_start(id);
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return pwm;
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}
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void pwm_free(struct pwm_device *pwm)
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{
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pwm_disable(pwm);
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jz4740_timer_set_ctrl(pwm->id, 0);
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jz_gpio_set_function(pwm->gpio, JZ_GPIO_FUNC_NONE);
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gpio_free(pwm->gpio);
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jz4740_timer_stop(pwm->id);
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pwm->used = false;
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}
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int pwm_config(struct pwm_device *pwm, int duty_ns, int period_ns)
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{
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unsigned long long tmp;
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unsigned long period, duty;
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unsigned int prescaler = 0;
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unsigned int id = pwm->id;
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uint16_t ctrl;
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bool is_enabled;
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if (duty_ns < 0 || duty_ns > period_ns)
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return -EINVAL;
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tmp = (unsigned long long)clk_get_rate(jz4740_pwm_clk) * period_ns;
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do_div(tmp, 1000000000);
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period = tmp;
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while (period > 0xffff && prescaler < 6) {
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period >>= 2;
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++prescaler;
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}
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if (prescaler == 6)
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return -EINVAL;
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tmp = (unsigned long long)period * duty_ns;
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do_div(tmp, period_ns);
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duty = period - tmp;
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if (duty >= period)
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duty = period - 1;
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is_enabled = jz4740_timer_is_enabled(id);
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if (is_enabled)
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pwm_disable(pwm);
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jz4740_timer_set_count(id, 0);
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jz4740_timer_set_duty(id, duty);
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jz4740_timer_set_period(id, period);
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ctrl = JZ_TIMER_CTRL_PRESCALER(prescaler) | JZ_TIMER_CTRL_SRC_EXT |
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JZ_TIMER_CTRL_PWM_ABBRUPT_SHUTDOWN;
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jz4740_timer_set_ctrl(id, ctrl);
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if (is_enabled)
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pwm_enable(pwm);
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return 0;
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}
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int pwm_enable(struct pwm_device *pwm)
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{
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uint32_t ctrl = jz4740_timer_get_ctrl(pwm->id);
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ctrl |= JZ_TIMER_CTRL_PWM_ENABLE;
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jz4740_timer_set_ctrl(pwm->id, ctrl);
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jz4740_timer_enable(pwm->id);
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return 0;
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}
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void pwm_disable(struct pwm_device *pwm)
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{
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uint32_t ctrl = jz4740_timer_get_ctrl(pwm->id);
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ctrl &= ~JZ_TIMER_CTRL_PWM_ENABLE;
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jz4740_timer_disable(pwm->id);
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jz4740_timer_set_ctrl(pwm->id, ctrl);
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}
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static int __init jz4740_pwm_init(void)
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{
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int ret = 0;
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jz4740_pwm_clk = clk_get(NULL, "ext");
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if (IS_ERR(jz4740_pwm_clk)) {
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ret = PTR_ERR(jz4740_pwm_clk);
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jz4740_pwm_clk = NULL;
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}
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return ret;
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}
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subsys_initcall(jz4740_pwm_init);
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@ -1,6 +1,5 @@
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menuconfig PWM
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bool "Pulse-Width Modulation (PWM) Support"
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depends on !MACH_JZ4740
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help
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Generic Pulse-Width Modulation (PWM) support.
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@ -56,6 +55,16 @@ config PWM_IMX
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To compile this driver as a module, choose M here: the module
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will be called pwm-imx.
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config PWM_JZ4740
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tristate "Ingenic JZ4740 PWM support"
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depends on MACH_JZ4740
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help
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Generic PWM framework driver for Ingenic JZ4740 based
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machines.
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To compile this driver as a module, choose M here: the module
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will be called pwm-jz4740.
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config PWM_LPC32XX
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tristate "LPC32XX PWM support"
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depends on ARCH_LPC32XX
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@ -2,6 +2,7 @@ obj-$(CONFIG_PWM) += core.o
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obj-$(CONFIG_PWM_AB8500) += pwm-ab8500.o
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obj-$(CONFIG_PWM_BFIN) += pwm-bfin.o
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obj-$(CONFIG_PWM_IMX) += pwm-imx.o
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obj-$(CONFIG_PWM_JZ4740) += pwm-jz4740.o
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obj-$(CONFIG_PWM_LPC32XX) += pwm-lpc32xx.o
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obj-$(CONFIG_PWM_MXS) += pwm-mxs.o
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obj-$(CONFIG_PWM_PUV3) += pwm-puv3.o
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@ -0,0 +1,221 @@
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/*
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* Copyright (C) 2010, Lars-Peter Clausen <lars@metafoo.de>
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* JZ4740 platform PWM support
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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*/
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#include <linux/clk.h>
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#include <linux/err.h>
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#include <linux/gpio.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/pwm.h>
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#include <asm/mach-jz4740/gpio.h>
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#include <asm/mach-jz4740/timer.h>
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#define NUM_PWM 8
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static const unsigned int jz4740_pwm_gpio_list[NUM_PWM] = {
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JZ_GPIO_PWM0,
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JZ_GPIO_PWM1,
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JZ_GPIO_PWM2,
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JZ_GPIO_PWM3,
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JZ_GPIO_PWM4,
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JZ_GPIO_PWM5,
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JZ_GPIO_PWM6,
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JZ_GPIO_PWM7,
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};
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struct jz4740_pwm_chip {
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struct pwm_chip chip;
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struct clk *clk;
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};
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static inline struct jz4740_pwm_chip *to_jz4740(struct pwm_chip *chip)
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{
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return container_of(chip, struct jz4740_pwm_chip, chip);
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}
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static int jz4740_pwm_request(struct pwm_chip *chip, struct pwm_device *pwm)
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{
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unsigned int gpio = jz4740_pwm_gpio_list[pwm->hwpwm];
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int ret;
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/*
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* Timers 0 and 1 are used for system tasks, so they are unavailable
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* for use as PWMs.
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*/
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if (pwm->hwpwm < 2)
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return -EBUSY;
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ret = gpio_request(gpio, pwm->label);
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if (ret) {
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dev_err(chip->dev, "Failed to request GPIO#%u for PWM: %d\n",
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gpio, ret);
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return ret;
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}
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jz_gpio_set_function(gpio, JZ_GPIO_FUNC_PWM);
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jz4740_timer_start(pwm->hwpwm);
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return 0;
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}
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static void jz4740_pwm_free(struct pwm_chip *chip, struct pwm_device *pwm)
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{
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unsigned int gpio = jz4740_pwm_gpio_list[pwm->hwpwm];
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jz4740_timer_set_ctrl(pwm->hwpwm, 0);
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jz_gpio_set_function(gpio, JZ_GPIO_FUNC_NONE);
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gpio_free(gpio);
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jz4740_timer_stop(pwm->hwpwm);
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}
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static int jz4740_pwm_enable(struct pwm_chip *chip, struct pwm_device *pwm)
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{
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uint32_t ctrl = jz4740_timer_get_ctrl(pwm->pwm);
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ctrl |= JZ_TIMER_CTRL_PWM_ENABLE;
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jz4740_timer_set_ctrl(pwm->hwpwm, ctrl);
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jz4740_timer_enable(pwm->hwpwm);
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return 0;
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}
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static void jz4740_pwm_disable(struct pwm_chip *chip, struct pwm_device *pwm)
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{
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uint32_t ctrl = jz4740_timer_get_ctrl(pwm->hwpwm);
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ctrl &= ~JZ_TIMER_CTRL_PWM_ENABLE;
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jz4740_timer_disable(pwm->hwpwm);
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jz4740_timer_set_ctrl(pwm->hwpwm, ctrl);
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}
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static int jz4740_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
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int duty_ns, int period_ns)
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{
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struct jz4740_pwm_chip *jz4740 = to_jz4740(pwm->chip);
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unsigned long long tmp;
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unsigned long period, duty;
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unsigned int prescaler = 0;
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uint16_t ctrl;
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bool is_enabled;
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tmp = (unsigned long long)clk_get_rate(jz4740->clk) * period_ns;
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do_div(tmp, 1000000000);
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period = tmp;
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while (period > 0xffff && prescaler < 6) {
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period >>= 2;
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++prescaler;
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}
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if (prescaler == 6)
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return -EINVAL;
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tmp = (unsigned long long)period * duty_ns;
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do_div(tmp, period_ns);
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duty = period - tmp;
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if (duty >= period)
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duty = period - 1;
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is_enabled = jz4740_timer_is_enabled(pwm->hwpwm);
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if (is_enabled)
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jz4740_pwm_disable(chip, pwm);
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jz4740_timer_set_count(pwm->hwpwm, 0);
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jz4740_timer_set_duty(pwm->hwpwm, duty);
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jz4740_timer_set_period(pwm->hwpwm, period);
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ctrl = JZ_TIMER_CTRL_PRESCALER(prescaler) | JZ_TIMER_CTRL_SRC_EXT |
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JZ_TIMER_CTRL_PWM_ABBRUPT_SHUTDOWN;
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jz4740_timer_set_ctrl(pwm->hwpwm, ctrl);
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if (is_enabled)
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jz4740_pwm_enable(chip, pwm);
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return 0;
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}
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static const struct pwm_ops jz4740_pwm_ops = {
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.request = jz4740_pwm_request,
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.free = jz4740_pwm_free,
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.config = jz4740_pwm_config,
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.enable = jz4740_pwm_enable,
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.disable = jz4740_pwm_disable,
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.owner = THIS_MODULE,
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};
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static int __devinit jz4740_pwm_probe(struct platform_device *pdev)
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{
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struct jz4740_pwm_chip *jz4740;
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int ret;
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jz4740 = devm_kzalloc(&pdev->dev, sizeof(*jz4740), GFP_KERNEL);
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if (!jz4740)
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return -ENOMEM;
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jz4740->clk = clk_get(NULL, "ext");
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if (IS_ERR(jz4740->clk))
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return PTR_ERR(jz4740->clk);
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jz4740->chip.dev = &pdev->dev;
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jz4740->chip.ops = &jz4740_pwm_ops;
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jz4740->chip.npwm = NUM_PWM;
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jz4740->chip.base = -1;
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ret = pwmchip_add(&jz4740->chip);
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if (ret < 0) {
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clk_put(jz4740->clk);
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return ret;
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}
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platform_set_drvdata(pdev, jz4740);
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return 0;
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}
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static int __devexit jz4740_pwm_remove(struct platform_device *pdev)
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{
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struct jz4740_pwm_chip *jz4740 = platform_get_drvdata(pdev);
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int ret;
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ret = pwmchip_remove(&jz4740->chip);
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if (ret < 0)
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return ret;
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clk_put(jz4740->clk);
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return 0;
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}
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static struct platform_driver jz4740_pwm_driver = {
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||||
.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");
|
||||
Loading…
Reference in New Issue