pwm: add ep93xx PWM support (a2308698) · Commits · 戴 / test

drivers/misc/Kconfig

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		@@ -381,19 +381,6 @@ config HMC6352
		This driver provides support for the Honeywell HMC6352 compass,
		providing configuration and heading data via sysfs.

		config EP93XX_PWM
		tristate "EP93xx PWM support"
		depends on ARCH_EP93XX
		help
		This option enables device driver support for the PWM channels
		on the Cirrus EP93xx processors. The EP9307 chip only has one
		PWM channel all the others have two, the second channel is an
		alternate function of the EGPIO14 pin. A sysfs interface is
		provided to control the PWM channels.

		To compile this driver as a module, choose M here: the module will
		be called ep93xx_pwm.

		config DS1682
		tristate "Dallas DS1682 Total Elapsed Time Recorder with Alarm"
		depends on I2C

drivers/misc/Makefile

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		@@ -33,7 +33,6 @@ obj-$(CONFIG_APDS9802ALS) += apds9802als.o
		obj-$(CONFIG_ISL29003) += isl29003.o
		obj-$(CONFIG_ISL29020) += isl29020.o
		obj-$(CONFIG_SENSORS_TSL2550) += tsl2550.o
		obj-$(CONFIG_EP93XX_PWM) += ep93xx_pwm.o
		obj-$(CONFIG_DS1682) += ds1682.o
		obj-$(CONFIG_TI_DAC7512) += ti_dac7512.o
		obj-$(CONFIG_C2PORT) += c2port/

drivers/misc/ep93xx_pwm.c

deleted100644 → 0

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		/*
		* Simple PWM driver for EP93XX
		*
		* (c) Copyright 2009 Matthieu Crapet <mcrapet@gmail.com>
		* (c) Copyright 2009 H Hartley Sweeten <hsweeten@visionengravers.com>
		*
		* 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.
		*
		* EP9307 has only one channel:
		* - PWMOUT
		*
		* EP9301/02/12/15 have two channels:
		* - PWMOUT
		* - PWMOUT1 (alternate function for EGPIO14)
		*/

		#include <linux/module.h>
		#include <linux/platform_device.h>
		#include <linux/slab.h>
		#include <linux/clk.h>
		#include <linux/err.h>
		#include <linux/io.h>

		#include <mach/platform.h>

		#define EP93XX_PWMx_TERM_COUNT 0x00
		#define EP93XX_PWMx_DUTY_CYCLE 0x04
		#define EP93XX_PWMx_ENABLE 0x08
		#define EP93XX_PWMx_INVERT 0x0C

		#define EP93XX_PWM_MAX_COUNT 0xFFFF

		struct ep93xx_pwm {
		void __iomem *mmio_base;
		struct clk *clk;
		u32 duty_percent;
		};

		/*
		* /sys/devices/platform/ep93xx-pwm.N
		* /min_freq read-only minimum pwm output frequency
		* /max_req read-only maximum pwm output frequency
		* /freq read-write pwm output frequency (0 = disable output)
		* /duty_percent read-write pwm duty cycle percent (1..99)
		* /invert read-write invert pwm output
		*/

		static ssize_t ep93xx_pwm_get_min_freq(struct device *dev,
		struct device_attribute attr, char buf)
		{
		struct platform_device *pdev = to_platform_device(dev);
		struct ep93xx_pwm *pwm = platform_get_drvdata(pdev);
		unsigned long rate = clk_get_rate(pwm->clk);

		return sprintf(buf, "%ld\n", rate / (EP93XX_PWM_MAX_COUNT + 1));
		}

		static ssize_t ep93xx_pwm_get_max_freq(struct device *dev,
		struct device_attribute attr, char buf)
		{
		struct platform_device *pdev = to_platform_device(dev);
		struct ep93xx_pwm *pwm = platform_get_drvdata(pdev);
		unsigned long rate = clk_get_rate(pwm->clk);

		return sprintf(buf, "%ld\n", rate / 2);
		}

		static ssize_t ep93xx_pwm_get_freq(struct device *dev,
		struct device_attribute attr, char buf)
		{
		struct platform_device *pdev = to_platform_device(dev);
		struct ep93xx_pwm *pwm = platform_get_drvdata(pdev);

		if (readl(pwm->mmio_base + EP93XX_PWMx_ENABLE) & 0x1) {
		unsigned long rate = clk_get_rate(pwm->clk);
		u16 term = readl(pwm->mmio_base + EP93XX_PWMx_TERM_COUNT);

		return sprintf(buf, "%ld\n", rate / (term + 1));
		} else {
		return sprintf(buf, "disabled\n");
		}
		}

		static ssize_t ep93xx_pwm_set_freq(struct device *dev,
		struct device_attribute attr, const char buf, size_t count)
		{
		struct platform_device *pdev = to_platform_device(dev);
		struct ep93xx_pwm *pwm = platform_get_drvdata(pdev);
		long val;
		int err;

		err = kstrtol(buf, 10, &val);
		if (err)
		return -EINVAL;

		if (val == 0) {
		writel(0x0, pwm->mmio_base + EP93XX_PWMx_ENABLE);
		} else if (val <= (clk_get_rate(pwm->clk) / 2)) {
		u32 term, duty;

		val = (clk_get_rate(pwm->clk) / val) - 1;
		if (val > EP93XX_PWM_MAX_COUNT)
		val = EP93XX_PWM_MAX_COUNT;
		if (val < 1)
		val = 1;

		term = readl(pwm->mmio_base + EP93XX_PWMx_TERM_COUNT);
		duty = ((val + 1) * pwm->duty_percent / 100) - 1;

		/* If pwm is running, order is important */
		if (val > term) {
		writel(val, pwm->mmio_base + EP93XX_PWMx_TERM_COUNT);
		writel(duty, pwm->mmio_base + EP93XX_PWMx_DUTY_CYCLE);
		} else {
		writel(duty, pwm->mmio_base + EP93XX_PWMx_DUTY_CYCLE);
		writel(val, pwm->mmio_base + EP93XX_PWMx_TERM_COUNT);
		}

		if (!readl(pwm->mmio_base + EP93XX_PWMx_ENABLE) & 0x1)
		writel(0x1, pwm->mmio_base + EP93XX_PWMx_ENABLE);
		} else {
		return -EINVAL;
		}

		return count;
		}

		static ssize_t ep93xx_pwm_get_duty_percent(struct device *dev,
		struct device_attribute attr, char buf)
		{
		struct platform_device *pdev = to_platform_device(dev);
		struct ep93xx_pwm *pwm = platform_get_drvdata(pdev);

		return sprintf(buf, "%d\n", pwm->duty_percent);
		}

		static ssize_t ep93xx_pwm_set_duty_percent(struct device *dev,
		struct device_attribute attr, const char buf, size_t count)
		{
		struct platform_device *pdev = to_platform_device(dev);
		struct ep93xx_pwm *pwm = platform_get_drvdata(pdev);
		long val;
		int err;

		err = kstrtol(buf, 10, &val);
		if (err)
		return -EINVAL;

		if (val > 0 && val < 100) {
		u32 term = readl(pwm->mmio_base + EP93XX_PWMx_TERM_COUNT);
		u32 duty = ((term + 1) * val / 100) - 1;

		writel(duty, pwm->mmio_base + EP93XX_PWMx_DUTY_CYCLE);
		pwm->duty_percent = val;
		return count;
		}

		return -EINVAL;
		}

		static ssize_t ep93xx_pwm_get_invert(struct device *dev,
		struct device_attribute attr, char buf)
		{
		struct platform_device *pdev = to_platform_device(dev);
		struct ep93xx_pwm *pwm = platform_get_drvdata(pdev);
		int inverted = readl(pwm->mmio_base + EP93XX_PWMx_INVERT) & 0x1;

		return sprintf(buf, "%d\n", inverted);
		}

		static ssize_t ep93xx_pwm_set_invert(struct device *dev,
		struct device_attribute attr, const char buf, size_t count)
		{
		struct platform_device *pdev = to_platform_device(dev);
		struct ep93xx_pwm *pwm = platform_get_drvdata(pdev);
		long val;
		int err;

		err = kstrtol(buf, 10, &val);
		if (err)
		return -EINVAL;

		if (val == 0)
		writel(0x0, pwm->mmio_base + EP93XX_PWMx_INVERT);
		else if (val == 1)
		writel(0x1, pwm->mmio_base + EP93XX_PWMx_INVERT);
		else
		return -EINVAL;

		return count;
		}

		static DEVICE_ATTR(min_freq, S_IRUGO, ep93xx_pwm_get_min_freq, NULL);
		static DEVICE_ATTR(max_freq, S_IRUGO, ep93xx_pwm_get_max_freq, NULL);
		static DEVICE_ATTR(freq, S_IWUSR \| S_IRUGO,
		ep93xx_pwm_get_freq, ep93xx_pwm_set_freq);
		static DEVICE_ATTR(duty_percent, S_IWUSR \| S_IRUGO,
		ep93xx_pwm_get_duty_percent, ep93xx_pwm_set_duty_percent);
		static DEVICE_ATTR(invert, S_IWUSR \| S_IRUGO,
		ep93xx_pwm_get_invert, ep93xx_pwm_set_invert);

		static struct attribute *ep93xx_pwm_attrs[] = {
		&dev_attr_min_freq.attr,
		&dev_attr_max_freq.attr,
		&dev_attr_freq.attr,
		&dev_attr_duty_percent.attr,
		&dev_attr_invert.attr,
		NULL
		};

		static const struct attribute_group ep93xx_pwm_sysfs_files = {
		.attrs = ep93xx_pwm_attrs,
		};

		static int ep93xx_pwm_probe(struct platform_device *pdev)
		{
		struct ep93xx_pwm *pwm;
		struct resource *res;
		int ret;

		pwm = devm_kzalloc(&pdev->dev, sizeof(*pwm), GFP_KERNEL);
		if (!pwm)
		return -ENOMEM;

		pwm->clk = devm_clk_get(&pdev->dev, "pwm_clk");
		if (IS_ERR(pwm->clk))
		return PTR_ERR(pwm->clk);

		res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
		pwm->mmio_base = devm_ioremap_resource(&pdev->dev, res);
		if (IS_ERR(pwm->mmio_base))
		return PTR_ERR(pwm->mmio_base);

		ret = ep93xx_pwm_acquire_gpio(pdev);
		if (ret)
		return ret;

		ret = sysfs_create_group(&pdev->dev.kobj, &ep93xx_pwm_sysfs_files);
		if (ret) {
		ep93xx_pwm_release_gpio(pdev);
		return ret;
		}

		pwm->duty_percent = 50;

		/* disable pwm at startup. Avoids zero value. */
		writel(0x0, pwm->mmio_base + EP93XX_PWMx_ENABLE);
		writel(EP93XX_PWM_MAX_COUNT, pwm->mmio_base + EP93XX_PWMx_TERM_COUNT);
		writel(EP93XX_PWM_MAX_COUNT/2, pwm->mmio_base + EP93XX_PWMx_DUTY_CYCLE);

		clk_enable(pwm->clk);

		platform_set_drvdata(pdev, pwm);
		return 0;
		}

		static int ep93xx_pwm_remove(struct platform_device *pdev)
		{
		struct ep93xx_pwm *pwm = platform_get_drvdata(pdev);

		writel(0x0, pwm->mmio_base + EP93XX_PWMx_ENABLE);
		clk_disable(pwm->clk);
		sysfs_remove_group(&pdev->dev.kobj, &ep93xx_pwm_sysfs_files);
		ep93xx_pwm_release_gpio(pdev);

		return 0;
		}

		static struct platform_driver ep93xx_pwm_driver = {
		.driver = {
		.name = "ep93xx-pwm",
		.owner = THIS_MODULE,
		},
		.probe = ep93xx_pwm_probe,
		.remove = ep93xx_pwm_remove,
		};
		module_platform_driver(ep93xx_pwm_driver);

		MODULE_AUTHOR("Matthieu Crapet <mcrapet@gmail.com>, "
		"H Hartley Sweeten <hsweeten@visionengravers.com>");
		MODULE_DESCRIPTION("EP93xx PWM driver");
		MODULE_LICENSE("GPL");
		MODULE_ALIAS("platform:ep93xx-pwm");

drivers/pwm/Kconfig

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		@@ -62,6 +62,15 @@ config PWM_BFIN
		To compile this driver as a module, choose M here: the module
		will be called pwm-bfin.

		config PWM_EP93XX
		tristate "Cirrus Logic EP93xx PWM support"
		depends on ARCH_EP93XX
		help
		Generic PWM framework driver for Cirrus Logic EP93xx.

		To compile this driver as a module, choose M here: the module
		will be called pwm-ep93xx.

		config PWM_IMX
		tristate "i.MX PWM support"
		depends on ARCH_MXC

drivers/pwm/Makefile

+1 −0

Original line number	Diff line number	Diff line
		@@ -3,6 +3,7 @@ obj-$(CONFIG_PWM_SYSFS) += sysfs.o
		obj-$(CONFIG_PWM_AB8500) += pwm-ab8500.o
		obj-$(CONFIG_PWM_ATMEL_TCB) += pwm-atmel-tcb.o
		obj-$(CONFIG_PWM_BFIN) += pwm-bfin.o
		obj-$(CONFIG_PWM_EP93XX) += pwm-ep93xx.o
		obj-$(CONFIG_PWM_IMX) += pwm-imx.o
		obj-$(CONFIG_PWM_JZ4740) += pwm-jz4740.o
		obj-$(CONFIG_PWM_LPC32XX) += pwm-lpc32xx.o

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