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Date: Mon, 10 Sep 2012 23:51:48 +0200
From: Lars-Peter Clausen <lars@...afoo.de>
To: Thierry Reding <thierry.reding@...onic-design.de>
CC: Ralf Baechle <ralf@...ux-mips.org>, linux-mips@...ux-mips.org,
linux-kernel@...r.kernel.org,
Antony Pavlov <antonynpavlov@...il.com>,
Maarten ter Huurne <maarten@...ewalker.org>
Subject: Re: [PATCH v2 3/3] pwm: Add Ingenic JZ4740 support
On 09/10/2012 02:05 PM, Thierry Reding wrote:
> This commit moves the driver to drivers/pwm and converts it to the new
> PWM framework.
>
> Signed-off-by: Thierry Reding <thierry.reding@...onic-design.de>
Seems to work, thanks a lot. This one and patch 2:
Acked-by: Lars-Peter Clausen <lars@...afoo.de>
Tested-by: Lars-Peter Clausen <lars@...afoo.de>
But I noticed a different problem. Some drivers using the pwm API depend on
HAVE_PWM (e.g. the pwm beeper driver), but the generic PWM framework does not
select HAVE_PWM, so I couldn't select the pwm beeper driver. Imo the generic
PWM framework should select HAVE_PWM
- Lars
> ---
> Changes in v2:
> - remove PWM core hunk that slipped in by mistake
> - change pwm-beeper platform data back to 4
> - refer to timer.h by full path
> - register PWMs 0 and 1 but reserve them for system tasks
> - replace printk by dev_err now that a proper device is available
> - use jz4740_pwm_{enable,disable}() instead of pwm_{enable,disable}()
> internally
> - make THIS_MODULE the owner of jz4740_pwm_ops and jz4740_pwm_driver
> - add __devinit and __devexit annotations to jz4740_pwm_probe() and
> jz4740_pwm_remove() respectively
> - add MODULE_AUTHOR(), MODULE_DESCRIPTION(), MODULE_ALIAS() and
> MODULE_LICENSE()
>
> arch/mips/include/asm/mach-jz4740/platform.h | 1 +
> arch/mips/jz4740/Kconfig | 3 -
> arch/mips/jz4740/Makefile | 2 +-
> arch/mips/jz4740/board-qi_lb60.c | 1 +
> arch/mips/jz4740/platform.c | 6 +
> arch/mips/jz4740/pwm.c | 177 ---------------------
> drivers/pwm/Kconfig | 12 +-
> drivers/pwm/Makefile | 1 +
> drivers/pwm/pwm-jz4740.c | 221 +++++++++++++++++++++++++++
> 9 files changed, 242 insertions(+), 182 deletions(-)
> delete mode 100644 arch/mips/jz4740/pwm.c
> create mode 100644 drivers/pwm/pwm-jz4740.c
>
> diff --git a/arch/mips/include/asm/mach-jz4740/platform.h b/arch/mips/include/asm/mach-jz4740/platform.h
> index 564ab81..163e81d 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 3e7141f..4689030 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 e44abea..63bad0e 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 9a3d9de..43d964d 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 e342ed4..6d14dcd 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 a26a6fa..0000000
> --- a/arch/mips/jz4740/pwm.c
> +++ /dev/null
> @@ -1,177 +0,0 @@
> -/*
> - * Copyright (C) 2010, Lars-Peter Clausen <lars@...afoo.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 90c5c73..5c663df 100644
> --- a/drivers/pwm/Kconfig
> +++ b/drivers/pwm/Kconfig
> @@ -1,6 +1,6 @@
> menuconfig PWM
> bool "Pulse-Width Modulation (PWM) Support"
> - depends on !MACH_JZ4740 && !PUV3_PWM
> + depends on !PUV3_PWM
> help
> Generic Pulse-Width Modulation (PWM) support.
>
> @@ -47,6 +47,16 @@ 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 e4b2c89..a1d6169 100644
> --- a/drivers/pwm/Makefile
> +++ b/drivers/pwm/Makefile
> @@ -1,6 +1,7 @@
> obj-$(CONFIG_PWM) += core.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_PXA) += pwm-pxa.o
> diff --git a/drivers/pwm/pwm-jz4740.c b/drivers/pwm/pwm-jz4740.c
> new file mode 100644
> index 0000000..10250fc
> --- /dev/null
> +++ b/drivers/pwm/pwm-jz4740.c
> @@ -0,0 +1,221 @@
> +/*
> + * Copyright (C) 2010, Lars-Peter Clausen <lars@...afoo.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@...afoo.de>");
> +MODULE_DESCRIPTION("Ingenic JZ4740 PWM driver");
> +MODULE_ALIAS("platform:jz4740-pwm");
> +MODULE_LICENSE("GPL");
--
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