ARM Samsung: Move s3c pwm driver to pwm framework

Move the driver to drivers/pwm/ and convert it to use the framework.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Cc: Ben Dooks <ben-linux@fluff.org>
Cc: Kukjin Kim <kgene.kim@samsung.com>
[eric@eukrea.com: fix pwmchip_add return code test]
Signed-off-by: Eric Bénard <eric@eukrea.com>
Signed-off-by: Thierry Reding <thierry.reding@avionic-design.de>

1 files changed, 0 insertions, 420 deletions

diff --git a/arch/arm/plat-samsung/pwm.c b/arch/arm/plat-samsung/pwm.c
deleted file mode 100644
index c559d8438c70..000000000000
--- a/arch/arm/plat-samsung/pwm.c
+++ /dev/null
@@ -1,420 +0,0 @@
-/* arch/arm/plat-s3c/pwm.c
- *
- * Copyright (c) 2007 Ben Dooks
- * Copyright (c) 2008 Simtec Electronics
- *	Ben Dooks <ben@simtec.co.uk>, <ben-linux@fluff.org>
- *
- * S3C series PWM device core
- *
- * 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.
-*/
-
-#include <linux/export.h>
-#include <linux/kernel.h>
-#include <linux/platform_device.h>
-#include <linux/slab.h>
-#include <linux/err.h>
-#include <linux/clk.h>
-#include <linux/io.h>
-#include <linux/pwm.h>
-
-#include <mach/map.h>
-
-#include <plat/regs-timer.h>
-
-struct pwm_device {
-	struct list_head	 list;
-	struct platform_device	*pdev;
-
-	struct clk		*clk_div;
-	struct clk		*clk;
-	const char		*label;
-
-	unsigned int		 period_ns;
-	unsigned int		 duty_ns;
-
-	unsigned char		 tcon_base;
-	unsigned char		 running;
-	unsigned char		 use_count;
-	unsigned char		 pwm_id;
-};
-
-#define pwm_dbg(_pwm, msg...) dev_dbg(&(_pwm)->pdev->dev, msg)
-
-static struct clk *clk_scaler[2];
-
-static inline int pwm_is_tdiv(struct pwm_device *pwm)
-{
-	return clk_get_parent(pwm->clk) == pwm->clk_div;
-}
-
-static DEFINE_MUTEX(pwm_lock);
-static LIST_HEAD(pwm_list);
-
-struct pwm_device *pwm_request(int pwm_id, const char *label)
-{
-	struct pwm_device *pwm;
-	int found = 0;
-
-	mutex_lock(&pwm_lock);
-
-	list_for_each_entry(pwm, &pwm_list, list) {
-		if (pwm->pwm_id == pwm_id) {
-			found = 1;
-			break;
-		}
-	}
-
-	if (found) {
-		if (pwm->use_count == 0) {
-			pwm->use_count = 1;
-			pwm->label = label;
-		} else
-			pwm = ERR_PTR(-EBUSY);
-	} else
-		pwm = ERR_PTR(-ENOENT);
-
-	mutex_unlock(&pwm_lock);
-	return pwm;
-}
-
-EXPORT_SYMBOL(pwm_request);
-
-
-void pwm_free(struct pwm_device *pwm)
-{
-	mutex_lock(&pwm_lock);
-
-	if (pwm->use_count) {
-		pwm->use_count--;
-		pwm->label = NULL;
-	} else
-		printk(KERN_ERR "PWM%d device already freed\n", pwm->pwm_id);
-
-	mutex_unlock(&pwm_lock);
-}
-
-EXPORT_SYMBOL(pwm_free);
-
-#define pwm_tcon_start(pwm) (1 << (pwm->tcon_base + 0))
-#define pwm_tcon_invert(pwm) (1 << (pwm->tcon_base + 2))
-#define pwm_tcon_autoreload(pwm) (1 << (pwm->tcon_base + 3))
-#define pwm_tcon_manulupdate(pwm) (1 << (pwm->tcon_base + 1))
-
-int pwm_enable(struct pwm_device *pwm)
-{
-	unsigned long flags;
-	unsigned long tcon;
-
-	local_irq_save(flags);
-
-	tcon = __raw_readl(S3C2410_TCON);
-	tcon |= pwm_tcon_start(pwm);
-	__raw_writel(tcon, S3C2410_TCON);
-
-	local_irq_restore(flags);
-
-	pwm->running = 1;
-	return 0;
-}
-
-EXPORT_SYMBOL(pwm_enable);
-
-void pwm_disable(struct pwm_device *pwm)
-{
-	unsigned long flags;
-	unsigned long tcon;
-
-	local_irq_save(flags);
-
-	tcon = __raw_readl(S3C2410_TCON);
-	tcon &= ~pwm_tcon_start(pwm);
-	__raw_writel(tcon, S3C2410_TCON);
-
-	local_irq_restore(flags);
-
-	pwm->running = 0;
-}
-
-EXPORT_SYMBOL(pwm_disable);
-
-static unsigned long pwm_calc_tin(struct pwm_device *pwm, unsigned long freq)
-{
-	unsigned long tin_parent_rate;
-	unsigned int div;
-
-	tin_parent_rate = clk_get_rate(clk_get_parent(pwm->clk_div));
-	pwm_dbg(pwm, "tin parent at %lu\n", tin_parent_rate);
-
-	for (div = 2; div <= 16; div *= 2) {
-		if ((tin_parent_rate / (div << 16)) < freq)
-			return tin_parent_rate / div;
-	}
-
-	return tin_parent_rate / 16;
-}
-
-#define NS_IN_HZ (1000000000UL)
-
-int pwm_config(struct pwm_device *pwm, int duty_ns, int period_ns)
-{
-	unsigned long tin_rate;
-	unsigned long tin_ns;
-	unsigned long period;
-	unsigned long flags;
-	unsigned long tcon;
-	unsigned long tcnt;
-	long tcmp;
-
-	/* We currently avoid using 64bit arithmetic by using the
-	 * fact that anything faster than 1Hz is easily representable
-	 * by 32bits. */
-
-	if (period_ns > NS_IN_HZ || duty_ns > NS_IN_HZ)
-		return -ERANGE;
-
-	if (duty_ns > period_ns)
-		return -EINVAL;
-
-	if (period_ns == pwm->period_ns &&
-	    duty_ns == pwm->duty_ns)
-		return 0;
-
-	/* The TCMP and TCNT can be read without a lock, they're not
-	 * shared between the timers. */
-
-	tcmp = __raw_readl(S3C2410_TCMPB(pwm->pwm_id));
-	tcnt = __raw_readl(S3C2410_TCNTB(pwm->pwm_id));
-
-	period = NS_IN_HZ / period_ns;
-
-	pwm_dbg(pwm, "duty_ns=%d, period_ns=%d (%lu)\n",
-		duty_ns, period_ns, period);
-
-	/* Check to see if we are changing the clock rate of the PWM */
-
-	if (pwm->period_ns != period_ns) {
-		if (pwm_is_tdiv(pwm)) {
-			tin_rate = pwm_calc_tin(pwm, period);
-			clk_set_rate(pwm->clk_div, tin_rate);
-		} else
-			tin_rate = clk_get_rate(pwm->clk);
-
-		pwm->period_ns = period_ns;
-
-		pwm_dbg(pwm, "tin_rate=%lu\n", tin_rate);
-
-		tin_ns = NS_IN_HZ / tin_rate;
-		tcnt = period_ns / tin_ns;
-	} else
-		tin_ns = NS_IN_HZ / clk_get_rate(pwm->clk);
-
-	/* Note, counters count down */
-
-	tcmp = duty_ns / tin_ns;
-	tcmp = tcnt - tcmp;
-	/* the pwm hw only checks the compare register after a decrement,
-	   so the pin never toggles if tcmp = tcnt */
-	if (tcmp == tcnt)
-		tcmp--;
-
-	pwm_dbg(pwm, "tin_ns=%lu, tcmp=%ld/%lu\n", tin_ns, tcmp, tcnt);
-
-	if (tcmp < 0)
-		tcmp = 0;
-
-	/* Update the PWM register block. */
-
-	local_irq_save(flags);
-
-	__raw_writel(tcmp, S3C2410_TCMPB(pwm->pwm_id));
-	__raw_writel(tcnt, S3C2410_TCNTB(pwm->pwm_id));
-
-	tcon = __raw_readl(S3C2410_TCON);
-	tcon |= pwm_tcon_manulupdate(pwm);
-	tcon |= pwm_tcon_autoreload(pwm);
-	__raw_writel(tcon, S3C2410_TCON);
-
-	tcon &= ~pwm_tcon_manulupdate(pwm);
-	__raw_writel(tcon, S3C2410_TCON);
-
-	local_irq_restore(flags);
-
-	return 0;
-}
-
-EXPORT_SYMBOL(pwm_config);
-
-static int pwm_register(struct pwm_device *pwm)
-{
-	pwm->duty_ns = -1;
-	pwm->period_ns = -1;
-
-	mutex_lock(&pwm_lock);
-	list_add_tail(&pwm->list, &pwm_list);
-	mutex_unlock(&pwm_lock);
-
-	return 0;
-}
-
-static int s3c_pwm_probe(struct platform_device *pdev)
-{
-	struct device *dev = &pdev->dev;
-	struct pwm_device *pwm;
-	unsigned long flags;
-	unsigned long tcon;
-	unsigned int id = pdev->id;
-	int ret;
-
-	if (id == 4) {
-		dev_err(dev, "TIMER4 is currently not supported\n");
-		return -ENXIO;
-	}
-
-	pwm = kzalloc(sizeof(struct pwm_device), GFP_KERNEL);
-	if (pwm == NULL) {
-		dev_err(dev, "failed to allocate pwm_device\n");
-		return -ENOMEM;
-	}
-
-	pwm->pdev = pdev;
-	pwm->pwm_id = id;
-
-	/* calculate base of control bits in TCON */
-	pwm->tcon_base = id == 0 ? 0 : (id * 4) + 4;
-
-	pwm->clk = clk_get(dev, "pwm-tin");
-	if (IS_ERR(pwm->clk)) {
-		dev_err(dev, "failed to get pwm tin clk\n");
-		ret = PTR_ERR(pwm->clk);
-		goto err_alloc;
-	}
-
-	pwm->clk_div = clk_get(dev, "pwm-tdiv");
-	if (IS_ERR(pwm->clk_div)) {
-		dev_err(dev, "failed to get pwm tdiv clk\n");
-		ret = PTR_ERR(pwm->clk_div);
-		goto err_clk_tin;
-	}
-
-	clk_enable(pwm->clk);
-	clk_enable(pwm->clk_div);
-
-	local_irq_save(flags);
-
-	tcon = __raw_readl(S3C2410_TCON);
-	tcon |= pwm_tcon_invert(pwm);
-	__raw_writel(tcon, S3C2410_TCON);
-
-	local_irq_restore(flags);
-
-
-	ret = pwm_register(pwm);
-	if (ret) {
-		dev_err(dev, "failed to register pwm\n");
-		goto err_clk_tdiv;
-	}
-
-	pwm_dbg(pwm, "config bits %02x\n",
-		(__raw_readl(S3C2410_TCON) >> pwm->tcon_base) & 0x0f);
-
-	dev_info(dev, "tin at %lu, tdiv at %lu, tin=%sclk, base %d\n",
-		 clk_get_rate(pwm->clk),
-		 clk_get_rate(pwm->clk_div),
-		 pwm_is_tdiv(pwm) ? "div" : "ext", pwm->tcon_base);
-
-	platform_set_drvdata(pdev, pwm);
-	return 0;
-
- err_clk_tdiv:
-	clk_disable(pwm->clk_div);
-	clk_disable(pwm->clk);
-	clk_put(pwm->clk_div);
-
- err_clk_tin:
-	clk_put(pwm->clk);
-
- err_alloc:
-	kfree(pwm);
-	return ret;
-}
-
-static int __devexit s3c_pwm_remove(struct platform_device *pdev)
-{
-	struct pwm_device *pwm = platform_get_drvdata(pdev);
-
-	clk_disable(pwm->clk_div);
-	clk_disable(pwm->clk);
-	clk_put(pwm->clk_div);
-	clk_put(pwm->clk);
-	kfree(pwm);
-
-	return 0;
-}
-
-#ifdef CONFIG_PM
-static int s3c_pwm_suspend(struct platform_device *pdev, pm_message_t state)
-{
-	struct pwm_device *pwm = platform_get_drvdata(pdev);
-
-	/* No one preserve these values during suspend so reset them
-	 * Otherwise driver leaves PWM unconfigured if same values
-	 * passed to pwm_config
-	 */
-	pwm->period_ns = 0;
-	pwm->duty_ns = 0;
-
-	return 0;
-}
-
-static int s3c_pwm_resume(struct platform_device *pdev)
-{
-	struct pwm_device *pwm = platform_get_drvdata(pdev);
-	unsigned long tcon;
-
-	/* Restore invertion */
-	tcon = __raw_readl(S3C2410_TCON);
-	tcon |= pwm_tcon_invert(pwm);
-	__raw_writel(tcon, S3C2410_TCON);
-
-	return 0;
-}
-
-#else
-#define s3c_pwm_suspend NULL
-#define s3c_pwm_resume NULL
-#endif
-
-static struct platform_driver s3c_pwm_driver = {
-	.driver		= {
-		.name	= "s3c24xx-pwm",
-		.owner	= THIS_MODULE,
-	},
-	.probe		= s3c_pwm_probe,
-	.remove		= __devexit_p(s3c_pwm_remove),
-	.suspend	= s3c_pwm_suspend,
-	.resume		= s3c_pwm_resume,
-};
-
-static int __init pwm_init(void)
-{
-	int ret;
-
-	clk_scaler[0] = clk_get(NULL, "pwm-scaler0");
-	clk_scaler[1] = clk_get(NULL, "pwm-scaler1");
-
-	if (IS_ERR(clk_scaler[0]) || IS_ERR(clk_scaler[1])) {
-		printk(KERN_ERR "%s: failed to get scaler clocks\n", __func__);
-		return -EINVAL;
-	}
-
-	ret = platform_driver_register(&s3c_pwm_driver);
-	if (ret)
-		printk(KERN_ERR "%s: failed to add pwm driver\n", __func__);
-
-	return ret;
-}
-
-arch_initcall(pwm_init);