mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-15 08:44:14 +08:00
pwm: add ep93xx PWM support
Remove the non-standard EP93xx PWM driver in drivers/misc and add a new driver for the PWM controllers on the EP93xx platform based on the PWM framework. These PWM controllers each support 1 PWM channel with programmable duty cycle, frequency, and polarity inversion. Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com> Cc: Ryan Mallon <rmallon@gmail.com> Acked-by: Arnd Bergmann <arnd@arndb.de> Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
This commit is contained in:
parent
8f43e18e27
commit
a230869817
@ -381,19 +381,6 @@ config HMC6352
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This driver provides support for the Honeywell HMC6352 compass,
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providing configuration and heading data via sysfs.
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config EP93XX_PWM
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tristate "EP93xx PWM support"
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depends on ARCH_EP93XX
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help
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This option enables device driver support for the PWM channels
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on the Cirrus EP93xx processors. The EP9307 chip only has one
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PWM channel all the others have two, the second channel is an
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alternate function of the EGPIO14 pin. A sysfs interface is
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provided to control the PWM channels.
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To compile this driver as a module, choose M here: the module will
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be called ep93xx_pwm.
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config DS1682
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tristate "Dallas DS1682 Total Elapsed Time Recorder with Alarm"
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depends on I2C
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@ -33,7 +33,6 @@ obj-$(CONFIG_APDS9802ALS) += apds9802als.o
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obj-$(CONFIG_ISL29003) += isl29003.o
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obj-$(CONFIG_ISL29020) += isl29020.o
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obj-$(CONFIG_SENSORS_TSL2550) += tsl2550.o
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obj-$(CONFIG_EP93XX_PWM) += ep93xx_pwm.o
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obj-$(CONFIG_DS1682) += ds1682.o
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obj-$(CONFIG_TI_DAC7512) += ti_dac7512.o
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obj-$(CONFIG_C2PORT) += c2port/
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@ -1,286 +0,0 @@
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/*
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* Simple PWM driver for EP93XX
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*
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* (c) Copyright 2009 Matthieu Crapet <mcrapet@gmail.com>
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* (c) Copyright 2009 H Hartley Sweeten <hsweeten@visionengravers.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*
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* EP9307 has only one channel:
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* - PWMOUT
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*
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* EP9301/02/12/15 have two channels:
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* - PWMOUT
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* - PWMOUT1 (alternate function for EGPIO14)
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*/
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/slab.h>
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#include <linux/clk.h>
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#include <linux/err.h>
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#include <linux/io.h>
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#include <mach/platform.h>
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#define EP93XX_PWMx_TERM_COUNT 0x00
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#define EP93XX_PWMx_DUTY_CYCLE 0x04
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#define EP93XX_PWMx_ENABLE 0x08
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#define EP93XX_PWMx_INVERT 0x0C
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#define EP93XX_PWM_MAX_COUNT 0xFFFF
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struct ep93xx_pwm {
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void __iomem *mmio_base;
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struct clk *clk;
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u32 duty_percent;
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};
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/*
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* /sys/devices/platform/ep93xx-pwm.N
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* /min_freq read-only minimum pwm output frequency
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* /max_req read-only maximum pwm output frequency
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* /freq read-write pwm output frequency (0 = disable output)
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* /duty_percent read-write pwm duty cycle percent (1..99)
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* /invert read-write invert pwm output
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*/
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static ssize_t ep93xx_pwm_get_min_freq(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct platform_device *pdev = to_platform_device(dev);
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struct ep93xx_pwm *pwm = platform_get_drvdata(pdev);
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unsigned long rate = clk_get_rate(pwm->clk);
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return sprintf(buf, "%ld\n", rate / (EP93XX_PWM_MAX_COUNT + 1));
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}
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static ssize_t ep93xx_pwm_get_max_freq(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct platform_device *pdev = to_platform_device(dev);
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struct ep93xx_pwm *pwm = platform_get_drvdata(pdev);
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unsigned long rate = clk_get_rate(pwm->clk);
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return sprintf(buf, "%ld\n", rate / 2);
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}
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static ssize_t ep93xx_pwm_get_freq(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct platform_device *pdev = to_platform_device(dev);
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struct ep93xx_pwm *pwm = platform_get_drvdata(pdev);
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if (readl(pwm->mmio_base + EP93XX_PWMx_ENABLE) & 0x1) {
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unsigned long rate = clk_get_rate(pwm->clk);
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u16 term = readl(pwm->mmio_base + EP93XX_PWMx_TERM_COUNT);
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return sprintf(buf, "%ld\n", rate / (term + 1));
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} else {
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return sprintf(buf, "disabled\n");
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}
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}
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static ssize_t ep93xx_pwm_set_freq(struct device *dev,
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struct device_attribute *attr, const char *buf, size_t count)
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{
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struct platform_device *pdev = to_platform_device(dev);
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struct ep93xx_pwm *pwm = platform_get_drvdata(pdev);
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long val;
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int err;
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err = kstrtol(buf, 10, &val);
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if (err)
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return -EINVAL;
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if (val == 0) {
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writel(0x0, pwm->mmio_base + EP93XX_PWMx_ENABLE);
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} else if (val <= (clk_get_rate(pwm->clk) / 2)) {
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u32 term, duty;
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val = (clk_get_rate(pwm->clk) / val) - 1;
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if (val > EP93XX_PWM_MAX_COUNT)
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val = EP93XX_PWM_MAX_COUNT;
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if (val < 1)
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val = 1;
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term = readl(pwm->mmio_base + EP93XX_PWMx_TERM_COUNT);
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duty = ((val + 1) * pwm->duty_percent / 100) - 1;
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/* If pwm is running, order is important */
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if (val > term) {
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writel(val, pwm->mmio_base + EP93XX_PWMx_TERM_COUNT);
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writel(duty, pwm->mmio_base + EP93XX_PWMx_DUTY_CYCLE);
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} else {
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writel(duty, pwm->mmio_base + EP93XX_PWMx_DUTY_CYCLE);
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writel(val, pwm->mmio_base + EP93XX_PWMx_TERM_COUNT);
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}
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if (!readl(pwm->mmio_base + EP93XX_PWMx_ENABLE) & 0x1)
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writel(0x1, pwm->mmio_base + EP93XX_PWMx_ENABLE);
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} else {
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return -EINVAL;
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}
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return count;
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}
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static ssize_t ep93xx_pwm_get_duty_percent(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct platform_device *pdev = to_platform_device(dev);
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struct ep93xx_pwm *pwm = platform_get_drvdata(pdev);
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return sprintf(buf, "%d\n", pwm->duty_percent);
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}
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static ssize_t ep93xx_pwm_set_duty_percent(struct device *dev,
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struct device_attribute *attr, const char *buf, size_t count)
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{
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struct platform_device *pdev = to_platform_device(dev);
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struct ep93xx_pwm *pwm = platform_get_drvdata(pdev);
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long val;
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int err;
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err = kstrtol(buf, 10, &val);
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if (err)
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return -EINVAL;
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if (val > 0 && val < 100) {
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u32 term = readl(pwm->mmio_base + EP93XX_PWMx_TERM_COUNT);
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u32 duty = ((term + 1) * val / 100) - 1;
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writel(duty, pwm->mmio_base + EP93XX_PWMx_DUTY_CYCLE);
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pwm->duty_percent = val;
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return count;
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}
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return -EINVAL;
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}
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static ssize_t ep93xx_pwm_get_invert(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct platform_device *pdev = to_platform_device(dev);
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struct ep93xx_pwm *pwm = platform_get_drvdata(pdev);
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int inverted = readl(pwm->mmio_base + EP93XX_PWMx_INVERT) & 0x1;
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return sprintf(buf, "%d\n", inverted);
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}
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static ssize_t ep93xx_pwm_set_invert(struct device *dev,
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struct device_attribute *attr, const char *buf, size_t count)
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{
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struct platform_device *pdev = to_platform_device(dev);
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struct ep93xx_pwm *pwm = platform_get_drvdata(pdev);
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long val;
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int err;
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err = kstrtol(buf, 10, &val);
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if (err)
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return -EINVAL;
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if (val == 0)
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writel(0x0, pwm->mmio_base + EP93XX_PWMx_INVERT);
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else if (val == 1)
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writel(0x1, pwm->mmio_base + EP93XX_PWMx_INVERT);
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else
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return -EINVAL;
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return count;
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}
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static DEVICE_ATTR(min_freq, S_IRUGO, ep93xx_pwm_get_min_freq, NULL);
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static DEVICE_ATTR(max_freq, S_IRUGO, ep93xx_pwm_get_max_freq, NULL);
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static DEVICE_ATTR(freq, S_IWUSR | S_IRUGO,
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ep93xx_pwm_get_freq, ep93xx_pwm_set_freq);
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static DEVICE_ATTR(duty_percent, S_IWUSR | S_IRUGO,
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ep93xx_pwm_get_duty_percent, ep93xx_pwm_set_duty_percent);
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static DEVICE_ATTR(invert, S_IWUSR | S_IRUGO,
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ep93xx_pwm_get_invert, ep93xx_pwm_set_invert);
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static struct attribute *ep93xx_pwm_attrs[] = {
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&dev_attr_min_freq.attr,
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&dev_attr_max_freq.attr,
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&dev_attr_freq.attr,
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&dev_attr_duty_percent.attr,
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&dev_attr_invert.attr,
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NULL
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};
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static const struct attribute_group ep93xx_pwm_sysfs_files = {
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.attrs = ep93xx_pwm_attrs,
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};
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static int ep93xx_pwm_probe(struct platform_device *pdev)
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{
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struct ep93xx_pwm *pwm;
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struct resource *res;
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int ret;
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pwm = devm_kzalloc(&pdev->dev, sizeof(*pwm), GFP_KERNEL);
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if (!pwm)
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return -ENOMEM;
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pwm->clk = devm_clk_get(&pdev->dev, "pwm_clk");
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if (IS_ERR(pwm->clk))
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return PTR_ERR(pwm->clk);
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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pwm->mmio_base = devm_ioremap_resource(&pdev->dev, res);
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if (IS_ERR(pwm->mmio_base))
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return PTR_ERR(pwm->mmio_base);
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ret = ep93xx_pwm_acquire_gpio(pdev);
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if (ret)
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return ret;
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ret = sysfs_create_group(&pdev->dev.kobj, &ep93xx_pwm_sysfs_files);
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if (ret) {
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ep93xx_pwm_release_gpio(pdev);
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return ret;
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}
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pwm->duty_percent = 50;
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/* disable pwm at startup. Avoids zero value. */
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writel(0x0, pwm->mmio_base + EP93XX_PWMx_ENABLE);
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writel(EP93XX_PWM_MAX_COUNT, pwm->mmio_base + EP93XX_PWMx_TERM_COUNT);
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writel(EP93XX_PWM_MAX_COUNT/2, pwm->mmio_base + EP93XX_PWMx_DUTY_CYCLE);
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clk_enable(pwm->clk);
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platform_set_drvdata(pdev, pwm);
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return 0;
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}
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static int ep93xx_pwm_remove(struct platform_device *pdev)
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{
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struct ep93xx_pwm *pwm = platform_get_drvdata(pdev);
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writel(0x0, pwm->mmio_base + EP93XX_PWMx_ENABLE);
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clk_disable(pwm->clk);
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sysfs_remove_group(&pdev->dev.kobj, &ep93xx_pwm_sysfs_files);
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ep93xx_pwm_release_gpio(pdev);
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return 0;
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}
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static struct platform_driver ep93xx_pwm_driver = {
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.driver = {
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.name = "ep93xx-pwm",
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.owner = THIS_MODULE,
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},
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.probe = ep93xx_pwm_probe,
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.remove = ep93xx_pwm_remove,
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};
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module_platform_driver(ep93xx_pwm_driver);
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MODULE_AUTHOR("Matthieu Crapet <mcrapet@gmail.com>, "
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"H Hartley Sweeten <hsweeten@visionengravers.com>");
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MODULE_DESCRIPTION("EP93xx PWM driver");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS("platform:ep93xx-pwm");
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@ -62,6 +62,15 @@ config PWM_BFIN
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To compile this driver as a module, choose M here: the module
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will be called pwm-bfin.
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config PWM_EP93XX
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tristate "Cirrus Logic EP93xx PWM support"
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depends on ARCH_EP93XX
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help
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Generic PWM framework driver for Cirrus Logic EP93xx.
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To compile this driver as a module, choose M here: the module
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will be called pwm-ep93xx.
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config PWM_IMX
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tristate "i.MX PWM support"
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depends on ARCH_MXC
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@ -3,6 +3,7 @@ obj-$(CONFIG_PWM_SYSFS) += sysfs.o
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obj-$(CONFIG_PWM_AB8500) += pwm-ab8500.o
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obj-$(CONFIG_PWM_ATMEL_TCB) += pwm-atmel-tcb.o
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obj-$(CONFIG_PWM_BFIN) += pwm-bfin.o
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obj-$(CONFIG_PWM_EP93XX) += pwm-ep93xx.o
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obj-$(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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230
drivers/pwm/pwm-ep93xx.c
Normal file
230
drivers/pwm/pwm-ep93xx.c
Normal file
@ -0,0 +1,230 @@
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/*
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* PWM framework driver for Cirrus Logic EP93xx
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*
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* Copyright (c) 2009 Matthieu Crapet <mcrapet@gmail.com>
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* Copyright (c) 2009, 2013 H Hartley Sweeten <hsweeten@visionengravers.com>
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*
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* EP9301/02 have only one channel:
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* platform device ep93xx-pwm.1 - PWMOUT1 (EGPIO14)
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*
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* EP9307 has only one channel:
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* platform device ep93xx-pwm.0 - PWMOUT
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*
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* EP9312/15 have two channels:
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* platform device ep93xx-pwm.0 - PWMOUT
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* platform device ep93xx-pwm.1 - PWMOUT1 (EGPIO14)
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/slab.h>
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#include <linux/clk.h>
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#include <linux/err.h>
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#include <linux/io.h>
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#include <linux/pwm.h>
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#include <asm/div64.h>
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#include <mach/platform.h> /* for ep93xx_pwm_{acquire,release}_gpio() */
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#define EP93XX_PWMx_TERM_COUNT 0x00
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#define EP93XX_PWMx_DUTY_CYCLE 0x04
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#define EP93XX_PWMx_ENABLE 0x08
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#define EP93XX_PWMx_INVERT 0x0c
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struct ep93xx_pwm {
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void __iomem *base;
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struct clk *clk;
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struct pwm_chip chip;
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};
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static inline struct ep93xx_pwm *to_ep93xx_pwm(struct pwm_chip *chip)
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{
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return container_of(chip, struct ep93xx_pwm, chip);
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}
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static int ep93xx_pwm_request(struct pwm_chip *chip, struct pwm_device *pwm)
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{
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struct platform_device *pdev = to_platform_device(chip->dev);
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return ep93xx_pwm_acquire_gpio(pdev);
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}
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static void ep93xx_pwm_free(struct pwm_chip *chip, struct pwm_device *pwm)
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{
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struct platform_device *pdev = to_platform_device(chip->dev);
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ep93xx_pwm_release_gpio(pdev);
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}
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static int ep93xx_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 ep93xx_pwm *ep93xx_pwm = to_ep93xx_pwm(chip);
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void __iomem *base = ep93xx_pwm->base;
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unsigned long long c;
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unsigned long period_cycles;
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unsigned long duty_cycles;
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unsigned long term;
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int ret = 0;
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||||
/*
|
||||
* The clock needs to be enabled to access the PWM registers.
|
||||
* Configuration can be changed at any time.
|
||||
*/
|
||||
if (!test_bit(PWMF_ENABLED, &pwm->flags)) {
|
||||
ret = clk_enable(ep93xx_pwm->clk);
|
||||
if (ret)
|
||||
return ret;
|
||||
}
|
||||
|
||||
c = clk_get_rate(ep93xx_pwm->clk);
|
||||
c *= period_ns;
|
||||
do_div(c, 1000000000);
|
||||
period_cycles = c;
|
||||
|
||||
c = period_cycles;
|
||||
c *= duty_ns;
|
||||
do_div(c, period_ns);
|
||||
duty_cycles = c;
|
||||
|
||||
if (period_cycles < 0x10000 && duty_cycles < 0x10000) {
|
||||
term = readw(base + EP93XX_PWMx_TERM_COUNT);
|
||||
|
||||
/* Order is important if PWM is running */
|
||||
if (period_cycles > term) {
|
||||
writew(period_cycles, base + EP93XX_PWMx_TERM_COUNT);
|
||||
writew(duty_cycles, base + EP93XX_PWMx_DUTY_CYCLE);
|
||||
} else {
|
||||
writew(duty_cycles, base + EP93XX_PWMx_DUTY_CYCLE);
|
||||
writew(period_cycles, base + EP93XX_PWMx_TERM_COUNT);
|
||||
}
|
||||
} else {
|
||||
ret = -EINVAL;
|
||||
}
|
||||
|
||||
if (!test_bit(PWMF_ENABLED, &pwm->flags))
|
||||
clk_disable(ep93xx_pwm->clk);
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
static int ep93xx_pwm_polarity(struct pwm_chip *chip, struct pwm_device *pwm,
|
||||
enum pwm_polarity polarity)
|
||||
{
|
||||
struct ep93xx_pwm *ep93xx_pwm = to_ep93xx_pwm(chip);
|
||||
int ret;
|
||||
|
||||
/*
|
||||
* The clock needs to be enabled to access the PWM registers.
|
||||
* Polarity can only be changed when the PWM is disabled.
|
||||
*/
|
||||
ret = clk_enable(ep93xx_pwm->clk);
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
if (polarity == PWM_POLARITY_INVERSED)
|
||||
writew(0x1, ep93xx_pwm->base + EP93XX_PWMx_INVERT);
|
||||
else
|
||||
writew(0x0, ep93xx_pwm->base + EP93XX_PWMx_INVERT);
|
||||
|
||||
clk_disable(ep93xx_pwm->clk);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int ep93xx_pwm_enable(struct pwm_chip *chip, struct pwm_device *pwm)
|
||||
{
|
||||
struct ep93xx_pwm *ep93xx_pwm = to_ep93xx_pwm(chip);
|
||||
int ret;
|
||||
|
||||
ret = clk_enable(ep93xx_pwm->clk);
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
writew(0x1, ep93xx_pwm->base + EP93XX_PWMx_ENABLE);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static void ep93xx_pwm_disable(struct pwm_chip *chip, struct pwm_device *pwm)
|
||||
{
|
||||
struct ep93xx_pwm *ep93xx_pwm = to_ep93xx_pwm(chip);
|
||||
|
||||
writew(0x0, ep93xx_pwm->base + EP93XX_PWMx_ENABLE);
|
||||
clk_disable(ep93xx_pwm->clk);
|
||||
}
|
||||
|
||||
static const struct pwm_ops ep93xx_pwm_ops = {
|
||||
.request = ep93xx_pwm_request,
|
||||
.free = ep93xx_pwm_free,
|
||||
.config = ep93xx_pwm_config,
|
||||
.set_polarity = ep93xx_pwm_polarity,
|
||||
.enable = ep93xx_pwm_enable,
|
||||
.disable = ep93xx_pwm_disable,
|
||||
.owner = THIS_MODULE,
|
||||
};
|
||||
|
||||
static int ep93xx_pwm_probe(struct platform_device *pdev)
|
||||
{
|
||||
struct ep93xx_pwm *ep93xx_pwm;
|
||||
struct resource *res;
|
||||
int ret;
|
||||
|
||||
ep93xx_pwm = devm_kzalloc(&pdev->dev, sizeof(*ep93xx_pwm), GFP_KERNEL);
|
||||
if (!ep93xx_pwm)
|
||||
return -ENOMEM;
|
||||
|
||||
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
||||
ep93xx_pwm->base = devm_ioremap_resource(&pdev->dev, res);
|
||||
if (IS_ERR(ep93xx_pwm->base))
|
||||
return PTR_ERR(ep93xx_pwm->base);
|
||||
|
||||
ep93xx_pwm->clk = devm_clk_get(&pdev->dev, "pwm_clk");
|
||||
if (IS_ERR(ep93xx_pwm->clk))
|
||||
return PTR_ERR(ep93xx_pwm->clk);
|
||||
|
||||
ep93xx_pwm->chip.dev = &pdev->dev;
|
||||
ep93xx_pwm->chip.ops = &ep93xx_pwm_ops;
|
||||
ep93xx_pwm->chip.base = -1;
|
||||
ep93xx_pwm->chip.npwm = 1;
|
||||
|
||||
ret = pwmchip_add(&ep93xx_pwm->chip);
|
||||
if (ret < 0)
|
||||
return ret;
|
||||
|
||||
platform_set_drvdata(pdev, ep93xx_pwm);
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int ep93xx_pwm_remove(struct platform_device *pdev)
|
||||
{
|
||||
struct ep93xx_pwm *ep93xx_pwm = platform_get_drvdata(pdev);
|
||||
|
||||
return pwmchip_remove(&ep93xx_pwm->chip);
|
||||
}
|
||||
|
||||
static struct platform_driver ep93xx_pwm_driver = {
|
||||
.driver = {
|
||||
.name = "ep93xx-pwm",
|
||||
},
|
||||
.probe = ep93xx_pwm_probe,
|
||||
.remove = ep93xx_pwm_remove,
|
||||
};
|
||||
module_platform_driver(ep93xx_pwm_driver);
|
||||
|
||||
MODULE_DESCRIPTION("Cirrus Logic EP93xx PWM driver");
|
||||
MODULE_AUTHOR("Matthieu Crapet <mcrapet@gmail.com>, "
|
||||
"H Hartley Sweeten <hsweeten@visionengravers.com>");
|
||||
MODULE_ALIAS("platform:ep93xx-pwm");
|
||||
MODULE_LICENSE("GPL");
|
Loading…
Reference in New Issue
Block a user