diff options
Diffstat (limited to 'drivers/misc/ep93xx_pwm.c')
| -rw-r--r-- | drivers/misc/ep93xx_pwm.c | 374 |
1 files changed, 0 insertions, 374 deletions
diff --git a/drivers/misc/ep93xx_pwm.c b/drivers/misc/ep93xx_pwm.c deleted file mode 100644 index 96787ec..0000000 --- a/drivers/misc/ep93xx_pwm.c +++ /dev/null @@ -1,374 +0,0 @@ -/* - * 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; -}; - -static inline void ep93xx_pwm_writel(struct ep93xx_pwm *pwm, - unsigned int val, unsigned int off) -{ - __raw_writel(val, pwm->mmio_base + off); -} - -static inline unsigned int ep93xx_pwm_readl(struct ep93xx_pwm *pwm, - unsigned int off) -{ - return __raw_readl(pwm->mmio_base + off); -} - -static inline void ep93xx_pwm_write_tc(struct ep93xx_pwm *pwm, u16 value) -{ - ep93xx_pwm_writel(pwm, value, EP93XX_PWMx_TERM_COUNT); -} - -static inline u16 ep93xx_pwm_read_tc(struct ep93xx_pwm *pwm) -{ - return ep93xx_pwm_readl(pwm, EP93XX_PWMx_TERM_COUNT); -} - -static inline void ep93xx_pwm_write_dc(struct ep93xx_pwm *pwm, u16 value) -{ - ep93xx_pwm_writel(pwm, value, EP93XX_PWMx_DUTY_CYCLE); -} - -static inline void ep93xx_pwm_enable(struct ep93xx_pwm *pwm) -{ - ep93xx_pwm_writel(pwm, 0x1, EP93XX_PWMx_ENABLE); -} - -static inline void ep93xx_pwm_disable(struct ep93xx_pwm *pwm) -{ - ep93xx_pwm_writel(pwm, 0x0, EP93XX_PWMx_ENABLE); -} - -static inline int ep93xx_pwm_is_enabled(struct ep93xx_pwm *pwm) -{ - return ep93xx_pwm_readl(pwm, EP93XX_PWMx_ENABLE) & 0x1; -} - -static inline void ep93xx_pwm_invert(struct ep93xx_pwm *pwm) -{ - ep93xx_pwm_writel(pwm, 0x1, EP93XX_PWMx_INVERT); -} - -static inline void ep93xx_pwm_normal(struct ep93xx_pwm *pwm) -{ - ep93xx_pwm_writel(pwm, 0x0, EP93XX_PWMx_INVERT); -} - -static inline int ep93xx_pwm_is_inverted(struct ep93xx_pwm *pwm) -{ - return ep93xx_pwm_readl(pwm, EP93XX_PWMx_INVERT) & 0x1; -} - -/* - * /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 (ep93xx_pwm_is_enabled(pwm)) { - unsigned long rate = clk_get_rate(pwm->clk); - u16 term = ep93xx_pwm_read_tc(pwm); - - 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 = strict_strtol(buf, 10, &val); - if (err) - return -EINVAL; - - if (val == 0) { - ep93xx_pwm_disable(pwm); - } 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 = ep93xx_pwm_read_tc(pwm); - duty = ((val + 1) * pwm->duty_percent / 100) - 1; - - /* If pwm is running, order is important */ - if (val > term) { - ep93xx_pwm_write_tc(pwm, val); - ep93xx_pwm_write_dc(pwm, duty); - } else { - ep93xx_pwm_write_dc(pwm, duty); - ep93xx_pwm_write_tc(pwm, val); - } - - if (!ep93xx_pwm_is_enabled(pwm)) - ep93xx_pwm_enable(pwm); - } 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 = strict_strtol(buf, 10, &val); - if (err) - return -EINVAL; - - if (val > 0 && val < 100) { - u32 term = ep93xx_pwm_read_tc(pwm); - ep93xx_pwm_write_dc(pwm, ((term + 1) * val / 100) - 1); - 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); - - return sprintf(buf, "%d\n", ep93xx_pwm_is_inverted(pwm)); -} - -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 = strict_strtol(buf, 10, &val); - if (err) - return -EINVAL; - - if (val == 0) - ep93xx_pwm_normal(pwm); - else if (val == 1) - ep93xx_pwm_invert(pwm); - 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 __init ep93xx_pwm_probe(struct platform_device *pdev) -{ - struct ep93xx_pwm *pwm; - struct resource *res; - int err; - - err = ep93xx_pwm_acquire_gpio(pdev); - if (err) - return err; - - pwm = kzalloc(sizeof(struct ep93xx_pwm), GFP_KERNEL); - if (!pwm) { - err = -ENOMEM; - goto fail_no_mem; - } - - res = platform_get_resource(pdev, IORESOURCE_MEM, 0); - if (res == NULL) { - err = -ENXIO; - goto fail_no_mem_resource; - } - - res = request_mem_region(res->start, resource_size(res), pdev->name); - if (res == NULL) { - err = -EBUSY; - goto fail_no_mem_resource; - } - - pwm->mmio_base = ioremap(res->start, resource_size(res)); - if (pwm->mmio_base == NULL) { - err = -ENXIO; - goto fail_no_ioremap; - } - - err = sysfs_create_group(&pdev->dev.kobj, &ep93xx_pwm_sysfs_files); - if (err) - goto fail_no_sysfs; - - pwm->clk = clk_get(&pdev->dev, "pwm_clk"); - if (IS_ERR(pwm->clk)) { - err = PTR_ERR(pwm->clk); - goto fail_no_clk; - } - - pwm->duty_percent = 50; - - platform_set_drvdata(pdev, pwm); - - /* disable pwm at startup. Avoids zero value. */ - ep93xx_pwm_disable(pwm); - ep93xx_pwm_write_tc(pwm, EP93XX_PWM_MAX_COUNT); - ep93xx_pwm_write_dc(pwm, EP93XX_PWM_MAX_COUNT / 2); - - clk_enable(pwm->clk); - - return 0; - -fail_no_clk: - sysfs_remove_group(&pdev->dev.kobj, &ep93xx_pwm_sysfs_files); -fail_no_sysfs: - iounmap(pwm->mmio_base); -fail_no_ioremap: - release_mem_region(res->start, resource_size(res)); -fail_no_mem_resource: - kfree(pwm); -fail_no_mem: - ep93xx_pwm_release_gpio(pdev); - return err; -} - -static int __exit ep93xx_pwm_remove(struct platform_device *pdev) -{ - struct ep93xx_pwm *pwm = platform_get_drvdata(pdev); - struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0); - - ep93xx_pwm_disable(pwm); - clk_disable(pwm->clk); - clk_put(pwm->clk); - platform_set_drvdata(pdev, NULL); - sysfs_remove_group(&pdev->dev.kobj, &ep93xx_pwm_sysfs_files); - iounmap(pwm->mmio_base); - release_mem_region(res->start, resource_size(res)); - kfree(pwm); - ep93xx_pwm_release_gpio(pdev); - - return 0; -} - -static struct platform_driver ep93xx_pwm_driver = { - .driver = { - .name = "ep93xx-pwm", - .owner = THIS_MODULE, - }, - .remove = __exit_p(ep93xx_pwm_remove), -}; - -module_platform_driver_probe(ep93xx_pwm_driver, ep93xx_pwm_probe); - -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"); |