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path: root/drivers/misc/ep93xx_pwm.c
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Diffstat (limited to 'drivers/misc/ep93xx_pwm.c')
-rw-r--r--drivers/misc/ep93xx_pwm.c385
1 files changed, 0 insertions, 385 deletions
diff --git a/drivers/misc/ep93xx_pwm.c b/drivers/misc/ep93xx_pwm.c
deleted file mode 100644
index 46b3439673e..00000000000
--- a/drivers/misc/ep93xx_pwm.c
+++ /dev/null
@@ -1,385 +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_IWUGO | S_IRUGO,
- ep93xx_pwm_get_freq, ep93xx_pwm_set_freq);
-static DEVICE_ATTR(duty_percent, S_IWUGO | S_IRUGO,
- ep93xx_pwm_get_duty_percent, ep93xx_pwm_set_duty_percent);
-static DEVICE_ATTR(invert, S_IWUGO | 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),
-};
-
-static int __init ep93xx_pwm_init(void)
-{
- return platform_driver_probe(&ep93xx_pwm_driver, ep93xx_pwm_probe);
-}
-
-static void __exit ep93xx_pwm_exit(void)
-{
- platform_driver_unregister(&ep93xx_pwm_driver);
-}
-
-module_init(ep93xx_pwm_init);
-module_exit(ep93xx_pwm_exit);
-
-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");
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-11-04 07:47:03 +0000