diff options
| -rw-r--r-- | arch/mips/include/asm/mach-jz4740/platform.h | 1 | ||||
| -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 | ||||
| -rw-r--r-- | drivers/pwm/Kconfig | 11 | ||||
| -rw-r--r-- | drivers/pwm/Makefile | 1 | ||||
| -rw-r--r-- | drivers/pwm/pwm-jz4740.c | 221 |
9 files changed, 241 insertions, 182 deletions
diff --git a/arch/mips/include/asm/mach-jz4740/platform.h b/arch/mips/include/asm/mach-jz4740/platform.h index 564ab81d6cdc..163e81db880d 100644 --- a/arch/mips/include/asm/mach-jz4740/platform.h +++ b/arch/mips/include/asm/mach-jz4740/platform.h @@ -31,6 +31,7 @@ extern struct platform_device jz4740_pcm_device; extern struct platform_device jz4740_codec_device; extern struct platform_device jz4740_adc_device; extern struct platform_device jz4740_wdt_device; +extern struct platform_device jz4740_pwm_device; void jz4740_serial_device_register(void); 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); diff --git a/drivers/pwm/Kconfig b/drivers/pwm/Kconfig index d954c72e242e..e67800581d60 100644 --- a/drivers/pwm/Kconfig +++ b/drivers/pwm/Kconfig @@ -1,6 +1,5 @@ menuconfig PWM bool "Pulse-Width Modulation (PWM) Support" - depends on !MACH_JZ4740 help Generic Pulse-Width Modulation (PWM) support. @@ -56,6 +55,16 @@ config PWM_IMX To compile this driver as a module, choose M here: the module will be called pwm-imx. +config PWM_JZ4740 + tristate "Ingenic JZ4740 PWM support" + depends on MACH_JZ4740 + help + Generic PWM framework driver for Ingenic JZ4740 based + machines. + + To compile this driver as a module, choose M here: the module + will be called pwm-jz4740. + config PWM_LPC32XX tristate "LPC32XX PWM support" depends on ARCH_LPC32XX diff --git a/drivers/pwm/Makefile b/drivers/pwm/Makefile index 360aad8fa3ae..29cf57e2c25e 100644 --- a/drivers/pwm/Makefile +++ b/drivers/pwm/Makefile @@ -2,6 +2,7 @@ obj-$(CONFIG_PWM) += core.o obj-$(CONFIG_PWM_AB8500) += pwm-ab8500.o obj-$(CONFIG_PWM_BFIN) += pwm-bfin.o obj-$(CONFIG_PWM_IMX) += pwm-imx.o +obj-$(CONFIG_PWM_JZ4740) += pwm-jz4740.o obj-$(CONFIG_PWM_LPC32XX) += pwm-lpc32xx.o obj-$(CONFIG_PWM_MXS) += pwm-mxs.o obj-$(CONFIG_PWM_PUV3) += pwm-puv3.o diff --git a/drivers/pwm/pwm-jz4740.c b/drivers/pwm/pwm-jz4740.c new file mode 100644 index 000000000000..10250fcefb98 --- /dev/null +++ b/drivers/pwm/pwm-jz4740.c @@ -0,0 +1,221 @@ +/* + * 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/clk.h> +#include <linux/err.h> +#include <linux/gpio.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/platform_device.h> +#include <linux/pwm.h> + +#include <asm/mach-jz4740/gpio.h> +#include <asm/mach-jz4740/timer.h> + +#define NUM_PWM 8 + +static const unsigned int jz4740_pwm_gpio_list[NUM_PWM] = { + JZ_GPIO_PWM0, + JZ_GPIO_PWM1, + JZ_GPIO_PWM2, + JZ_GPIO_PWM3, + JZ_GPIO_PWM4, + JZ_GPIO_PWM5, + JZ_GPIO_PWM6, + JZ_GPIO_PWM7, +}; + +struct jz4740_pwm_chip { + struct pwm_chip chip; + struct clk *clk; +}; + +static inline struct jz4740_pwm_chip *to_jz4740(struct pwm_chip *chip) +{ + return container_of(chip, struct jz4740_pwm_chip, chip); +} + +static int jz4740_pwm_request(struct pwm_chip *chip, struct pwm_device *pwm) +{ + unsigned int gpio = jz4740_pwm_gpio_list[pwm->hwpwm]; + int ret; + + /* + * Timers 0 and 1 are used for system tasks, so they are unavailable + * for use as PWMs. + */ + if (pwm->hwpwm < 2) + return -EBUSY; + + ret = gpio_request(gpio, pwm->label); + if (ret) { + dev_err(chip->dev, "Failed to request GPIO#%u for PWM: %d\n", + gpio, ret); + return ret; + } + + jz_gpio_set_function(gpio, JZ_GPIO_FUNC_PWM); + + jz4740_timer_start(pwm->hwpwm); + + return 0; +} + +static void jz4740_pwm_free(struct pwm_chip *chip, struct pwm_device *pwm) +{ + unsigned int gpio = jz4740_pwm_gpio_list[pwm->hwpwm]; + + jz4740_timer_set_ctrl(pwm->hwpwm, 0); + + jz_gpio_set_function(gpio, JZ_GPIO_FUNC_NONE); + gpio_free(gpio); + + jz4740_timer_stop(pwm->hwpwm); +} + +static int jz4740_pwm_enable(struct pwm_chip *chip, struct pwm_device *pwm) +{ + uint32_t ctrl = jz4740_timer_get_ctrl(pwm->pwm); + + ctrl |= JZ_TIMER_CTRL_PWM_ENABLE; + jz4740_timer_set_ctrl(pwm->hwpwm, ctrl); + jz4740_timer_enable(pwm->hwpwm); + + return 0; +} + +static void jz4740_pwm_disable(struct pwm_chip *chip, struct pwm_device *pwm) +{ + uint32_t ctrl = jz4740_timer_get_ctrl(pwm->hwpwm); + + ctrl &= ~JZ_TIMER_CTRL_PWM_ENABLE; + jz4740_timer_disable(pwm->hwpwm); + jz4740_timer_set_ctrl(pwm->hwpwm, ctrl); +} + +static int jz4740_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm, + int duty_ns, int period_ns) +{ + struct jz4740_pwm_chip *jz4740 = to_jz4740(pwm->chip); + unsigned long long tmp; + unsigned long period, duty; + unsigned int prescaler = 0; + uint16_t ctrl; + bool is_enabled; + + tmp = (unsigned long long)clk_get_rate(jz4740->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(pwm->hwpwm); + if (is_enabled) + jz4740_pwm_disable(chip, pwm); + + jz4740_timer_set_count(pwm->hwpwm, 0); + jz4740_timer_set_duty(pwm->hwpwm, duty); + jz4740_timer_set_period(pwm->hwpwm, period); + + ctrl = JZ_TIMER_CTRL_PRESCALER(prescaler) | JZ_TIMER_CTRL_SRC_EXT | + JZ_TIMER_CTRL_PWM_ABBRUPT_SHUTDOWN; + + jz4740_timer_set_ctrl(pwm->hwpwm, ctrl); + + if (is_enabled) + jz4740_pwm_enable(chip, pwm); + + return 0; +} + +static const struct pwm_ops jz4740_pwm_ops = { + .request = jz4740_pwm_request, + .free = jz4740_pwm_free, + .config = jz4740_pwm_config, + .enable = jz4740_pwm_enable, + .disable = jz4740_pwm_disable, + .owner = THIS_MODULE, +}; + +static int __devinit jz4740_pwm_probe(struct platform_device *pdev) +{ + struct jz4740_pwm_chip *jz4740; + int ret; + + jz4740 = devm_kzalloc(&pdev->dev, sizeof(*jz4740), GFP_KERNEL); + if (!jz4740) + return -ENOMEM; + + jz4740->clk = clk_get(NULL, "ext"); + if (IS_ERR(jz4740->clk)) + return PTR_ERR(jz4740->clk); + + jz4740->chip.dev = &pdev->dev; + jz4740->chip.ops = &jz4740_pwm_ops; + jz4740->chip.npwm = NUM_PWM; + jz4740->chip.base = -1; + + ret = pwmchip_add(&jz4740->chip); + if (ret < 0) { + clk_put(jz4740->clk); + return ret; + } + + platform_set_drvdata(pdev, jz4740); + + return 0; +} + +static int __devexit jz4740_pwm_remove(struct platform_device *pdev) +{ + struct jz4740_pwm_chip *jz4740 = platform_get_drvdata(pdev); + int ret; + + ret = pwmchip_remove(&jz4740->chip); + if (ret < 0) + return ret; + + clk_put(jz4740->clk); + + return 0; +} + +static struct platform_driver jz4740_pwm_driver = { + .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"); |