ARM vt8500: Move vt8500 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: Alexey Charkov <alchark@gmail.com>
Signed-off-by: Thierry Reding <thierry.reding@avionic-design.de>

1 files changed, 0 insertions, 265 deletions

diff --git a/arch/arm/mach-vt8500/pwm.c b/arch/arm/mach-vt8500/pwm.c
deleted file mode 100644
index 8ad825e9359..00000000000
--- a/arch/arm/mach-vt8500/pwm.c
+++ /dev/null
@@ -1,265 +0,0 @@
-/*
- * arch/arm/mach-vt8500/pwm.c
- *
- *  Copyright (C) 2010 Alexey Charkov <alchark@gmail.com>
- *
- * This software is licensed under the terms of the GNU General Public
- * License version 2, as published by the Free Software Foundation, and
- * may be copied, distributed, and modified under those terms.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- */
-
-#include <linux/module.h>
-#include <linux/kernel.h>
-#include <linux/platform_device.h>
-#include <linux/slab.h>
-#include <linux/err.h>
-#include <linux/io.h>
-#include <linux/pwm.h>
-#include <linux/delay.h>
-
-#include <asm/div64.h>
-
-#define VT8500_NR_PWMS 4
-
-static DEFINE_MUTEX(pwm_lock);
-static LIST_HEAD(pwm_list);
-
-struct pwm_device {
-	struct list_head	node;
-	struct platform_device	*pdev;
-
-	const char	*label;
-
-	void __iomem	*regbase;
-
-	unsigned int	use_count;
-	unsigned int	pwm_id;
-};
-
-#define msecs_to_loops(t) (loops_per_jiffy / 1000 * HZ * t)
-static inline void pwm_busy_wait(void __iomem *reg, u8 bitmask)
-{
-	int loops = msecs_to_loops(10);
-	while ((readb(reg) & bitmask) && --loops)
-		cpu_relax();
-
-	if (unlikely(!loops))
-		pr_warning("Waiting for status bits 0x%x to clear timed out\n",
-			   bitmask);
-}
-
-int pwm_config(struct pwm_device *pwm, int duty_ns, int period_ns)
-{
-	unsigned long long c;
-	unsigned long period_cycles, prescale, pv, dc;
-
-	if (pwm == NULL || period_ns == 0 || duty_ns > period_ns)
-		return -EINVAL;
-
-	c = 25000000/2; /* wild guess --- need to implement clocks */
-	c = c * period_ns;
-	do_div(c, 1000000000);
-	period_cycles = c;
-
-	if (period_cycles < 1)
-		period_cycles = 1;
-	prescale = (period_cycles - 1) / 4096;
-	pv = period_cycles / (prescale + 1) - 1;
-	if (pv > 4095)
-		pv = 4095;
-
-	if (prescale > 1023)
-		return -EINVAL;
-
-	c = (unsigned long long)pv * duty_ns;
-	do_div(c, period_ns);
-	dc = c;
-
-	pwm_busy_wait(pwm->regbase + 0x40 + pwm->pwm_id, (1 << 1));
-	writel(prescale, pwm->regbase + 0x4 + (pwm->pwm_id << 4));
-
-	pwm_busy_wait(pwm->regbase + 0x40 + pwm->pwm_id, (1 << 2));
-	writel(pv, pwm->regbase + 0x8 + (pwm->pwm_id << 4));
-
-	pwm_busy_wait(pwm->regbase + 0x40 + pwm->pwm_id, (1 << 3));
-	writel(dc, pwm->regbase + 0xc + (pwm->pwm_id << 4));
-
-	return 0;
-}
-EXPORT_SYMBOL(pwm_config);
-
-int pwm_enable(struct pwm_device *pwm)
-{
-	pwm_busy_wait(pwm->regbase + 0x40 + pwm->pwm_id, (1 << 0));
-	writel(5, pwm->regbase + (pwm->pwm_id << 4));
-	return 0;
-}
-EXPORT_SYMBOL(pwm_enable);
-
-void pwm_disable(struct pwm_device *pwm)
-{
-	pwm_busy_wait(pwm->regbase + 0x40 + pwm->pwm_id, (1 << 0));
-	writel(0, pwm->regbase + (pwm->pwm_id << 4));
-}
-EXPORT_SYMBOL(pwm_disable);
-
-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, node) {
-		if (pwm->pwm_id == pwm_id) {
-			found = 1;
-			break;
-		}
-	}
-
-	if (found) {
-		if (pwm->use_count == 0) {
-			pwm->use_count++;
-			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 {
-		pr_warning("PWM device already freed\n");
-	}
-
-	mutex_unlock(&pwm_lock);
-}
-EXPORT_SYMBOL(pwm_free);
-
-static inline void __add_pwm(struct pwm_device *pwm)
-{
-	mutex_lock(&pwm_lock);
-	list_add_tail(&pwm->node, &pwm_list);
-	mutex_unlock(&pwm_lock);
-}
-
-static int __devinit pwm_probe(struct platform_device *pdev)
-{
-	struct pwm_device *pwms;
-	struct resource *r;
-	int ret = 0;
-	int i;
-
-	pwms = kzalloc(sizeof(struct pwm_device) * VT8500_NR_PWMS, GFP_KERNEL);
-	if (pwms == NULL) {
-		dev_err(&pdev->dev, "failed to allocate memory\n");
-		return -ENOMEM;
-	}
-
-	for (i = 0; i < VT8500_NR_PWMS; i++) {
-		pwms[i].use_count = 0;
-		pwms[i].pwm_id = i;
-		pwms[i].pdev = pdev;
-	}
-
-	r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	if (r == NULL) {
-		dev_err(&pdev->dev, "no memory resource defined\n");
-		ret = -ENODEV;
-		goto err_free;
-	}
-
-	r = request_mem_region(r->start, resource_size(r), pdev->name);
-	if (r == NULL) {
-		dev_err(&pdev->dev, "failed to request memory resource\n");
-		ret = -EBUSY;
-		goto err_free;
-	}
-
-	pwms[0].regbase = ioremap(r->start, resource_size(r));
-	if (pwms[0].regbase == NULL) {
-		dev_err(&pdev->dev, "failed to ioremap() registers\n");
-		ret = -ENODEV;
-		goto err_free_mem;
-	}
-
-	for (i = 1; i < VT8500_NR_PWMS; i++)
-		pwms[i].regbase = pwms[0].regbase;
-
-	for (i = 0; i < VT8500_NR_PWMS; i++)
-		__add_pwm(&pwms[i]);
-
-	platform_set_drvdata(pdev, pwms);
-	return 0;
-
-err_free_mem:
-	release_mem_region(r->start, resource_size(r));
-err_free:
-	kfree(pwms);
-	return ret;
-}
-
-static int __devexit pwm_remove(struct platform_device *pdev)
-{
-	struct pwm_device *pwms;
-	struct resource *r;
-	int i;
-
-	pwms = platform_get_drvdata(pdev);
-	if (pwms == NULL)
-		return -ENODEV;
-
-	mutex_lock(&pwm_lock);
-
-	for (i = 0; i < VT8500_NR_PWMS; i++)
-		list_del(&pwms[i].node);
-	mutex_unlock(&pwm_lock);
-
-	iounmap(pwms[0].regbase);
-
-	r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	release_mem_region(r->start, resource_size(r));
-
-	kfree(pwms);
-	return 0;
-}
-
-static struct platform_driver pwm_driver = {
-	.driver		= {
-		.name	= "vt8500-pwm",
-		.owner	= THIS_MODULE,
-	},
-	.probe		= pwm_probe,
-	.remove		= __devexit_p(pwm_remove),
-};
-
-static int __init pwm_init(void)
-{
-	return platform_driver_register(&pwm_driver);
-}
-arch_initcall(pwm_init);
-
-static void __exit pwm_exit(void)
-{
-	platform_driver_unregister(&pwm_driver);
-}
-module_exit(pwm_exit);
-
-MODULE_LICENSE("GPL");