1 files changed, 450 insertions, 0 deletions
diff --git a/drivers/watchdog/omap_wdt.c b/drivers/watchdog/omap_wdt.c
new file mode 100644
index 00000000..8285d65c
--- /dev/null
+++ b/drivers/watchdog/omap_wdt.c
@@ -0,0 +1,450 @@
+/*
+ * omap_wdt.c
+ *
+ * Watchdog driver for the TI OMAP 16xx & 24xx/34xx 32KHz (non-secure) watchdog
+ *
+ * Author: MontaVista Software, Inc.
+ *	 <gdavis@mvista.com> or <source@mvista.com>
+ *
+ * 2003 (c) MontaVista Software, Inc. This file is licensed under the
+ * terms of the GNU General Public License version 2. This program is
+ * licensed "as is" without any warranty of any kind, whether express
+ * or implied.
+ *
+ * History:
+ *
+ * 20030527: George G. Davis <gdavis@mvista.com>
+ *	Initially based on linux-2.4.19-rmk7-pxa1/drivers/char/sa1100_wdt.c
+ *	(c) Copyright 2000 Oleg Drokin <green@crimea.edu>
+ *	Based on SoftDog driver by Alan Cox <alan@lxorguk.ukuu.org.uk>
+ *
+ * Copyright (c) 2004 Texas Instruments.
+ *	1. Modified to support OMAP1610 32-KHz watchdog timer
+ *	2. Ported to 2.6 kernel
+ *
+ * Copyright (c) 2005 David Brownell
+ *	Use the driver model and standard identifiers; handle bigger timeouts.
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/fs.h>
+#include <linux/mm.h>
+#include <linux/miscdevice.h>
+#include <linux/watchdog.h>
+#include <linux/reboot.h>
+#include <linux/init.h>
+#include <linux/err.h>
+#include <linux/platform_device.h>
+#include <linux/moduleparam.h>
+#include <linux/bitops.h>
+#include <linux/io.h>
+#include <linux/uaccess.h>
+#include <linux/slab.h>
+#include <linux/pm_runtime.h>
+#include <mach/hardware.h>
+#include <plat/prcm.h>
+
+#include "omap_wdt.h"
+
+static struct platform_device *omap_wdt_dev;
+
+static unsigned timer_margin;
+module_param(timer_margin, uint, 0);
+MODULE_PARM_DESC(timer_margin, "initial watchdog timeout (in seconds)");
+
+static unsigned int wdt_trgr_pattern = 0x1234;
+static DEFINE_SPINLOCK(wdt_lock);
+
+struct omap_wdt_dev {
+	void __iomem    *base;          /* physical */
+	struct device   *dev;
+	int             omap_wdt_users;
+	struct resource *mem;
+	struct miscdevice omap_wdt_miscdev;
+};
+
+static void omap_wdt_ping(struct omap_wdt_dev *wdev)
+{
+	void __iomem    *base = wdev->base;
+
+	/* wait for posted write to complete */
+	while ((__raw_readl(base + OMAP_WATCHDOG_WPS)) & 0x08)
+		cpu_relax();
+
+	wdt_trgr_pattern = ~wdt_trgr_pattern;
+	__raw_writel(wdt_trgr_pattern, (base + OMAP_WATCHDOG_TGR));
+
+	/* wait for posted write to complete */
+	while ((__raw_readl(base + OMAP_WATCHDOG_WPS)) & 0x08)
+		cpu_relax();
+	/* reloaded WCRR from WLDR */
+}
+
+static void omap_wdt_enable(struct omap_wdt_dev *wdev)
+{
+	void __iomem *base = wdev->base;
+
+	/* Sequence to enable the watchdog */
+	__raw_writel(0xBBBB, base + OMAP_WATCHDOG_SPR);
+	while ((__raw_readl(base + OMAP_WATCHDOG_WPS)) & 0x10)
+		cpu_relax();
+
+	__raw_writel(0x4444, base + OMAP_WATCHDOG_SPR);
+	while ((__raw_readl(base + OMAP_WATCHDOG_WPS)) & 0x10)
+		cpu_relax();
+}
+
+static void omap_wdt_disable(struct omap_wdt_dev *wdev)
+{
+	void __iomem *base = wdev->base;
+
+	/* sequence required to disable watchdog */
+	__raw_writel(0xAAAA, base + OMAP_WATCHDOG_SPR);	/* TIMER_MODE */
+	while (__raw_readl(base + OMAP_WATCHDOG_WPS) & 0x10)
+		cpu_relax();
+
+	__raw_writel(0x5555, base + OMAP_WATCHDOG_SPR);	/* TIMER_MODE */
+	while (__raw_readl(base + OMAP_WATCHDOG_WPS) & 0x10)
+		cpu_relax();
+}
+
+static void omap_wdt_adjust_timeout(unsigned new_timeout)
+{
+	if (new_timeout < TIMER_MARGIN_MIN)
+		new_timeout = TIMER_MARGIN_DEFAULT;
+	if (new_timeout > TIMER_MARGIN_MAX)
+		new_timeout = TIMER_MARGIN_MAX;
+	timer_margin = new_timeout;
+}
+
+static void omap_wdt_set_timeout(struct omap_wdt_dev *wdev)
+{
+	u32 pre_margin = GET_WLDR_VAL(timer_margin);
+	void __iomem *base = wdev->base;
+
+	pm_runtime_get_sync(wdev->dev);
+
+	/* just count up at 32 KHz */
+	while (__raw_readl(base + OMAP_WATCHDOG_WPS) & 0x04)
+		cpu_relax();
+
+	__raw_writel(pre_margin, base + OMAP_WATCHDOG_LDR);
+	while (__raw_readl(base + OMAP_WATCHDOG_WPS) & 0x04)
+		cpu_relax();
+
+	pm_runtime_put_sync(wdev->dev);
+}
+
+/*
+ *	Allow only one task to hold it open
+ */
+static int omap_wdt_open(struct inode *inode, struct file *file)
+{
+	struct omap_wdt_dev *wdev = platform_get_drvdata(omap_wdt_dev);
+	void __iomem *base = wdev->base;
+
+	if (test_and_set_bit(1, (unsigned long *)&(wdev->omap_wdt_users)))
+		return -EBUSY;
+
+	pm_runtime_get_sync(wdev->dev);
+
+	/* initialize prescaler */
+	while (__raw_readl(base + OMAP_WATCHDOG_WPS) & 0x01)
+		cpu_relax();
+
+	__raw_writel((1 << 5) | (PTV << 2), base + OMAP_WATCHDOG_CNTRL);
+	while (__raw_readl(base + OMAP_WATCHDOG_WPS) & 0x01)
+		cpu_relax();
+
+	file->private_data = (void *) wdev;
+
+	omap_wdt_set_timeout(wdev);
+	omap_wdt_ping(wdev); /* trigger loading of new timeout value */
+	omap_wdt_enable(wdev);
+
+	pm_runtime_put_sync(wdev->dev);
+
+	return nonseekable_open(inode, file);
+}
+
+static int omap_wdt_release(struct inode *inode, struct file *file)
+{
+	struct omap_wdt_dev *wdev = file->private_data;
+
+	/*
+	 *      Shut off the timer unless NOWAYOUT is defined.
+	 */
+#ifndef CONFIG_WATCHDOG_NOWAYOUT
+	pm_runtime_get_sync(wdev->dev);
+
+	omap_wdt_disable(wdev);
+
+	pm_runtime_put_sync(wdev->dev);
+#else
+	pr_crit("Unexpected close, not stopping!\n");
+#endif
+	wdev->omap_wdt_users = 0;
+
+	return 0;
+}
+
+static ssize_t omap_wdt_write(struct file *file, const char __user *data,
+		size_t len, loff_t *ppos)
+{
+	struct omap_wdt_dev *wdev = file->private_data;
+
+	/* Refresh LOAD_TIME. */
+	if (len) {
+		pm_runtime_get_sync(wdev->dev);
+		spin_lock(&wdt_lock);
+		omap_wdt_ping(wdev);
+		spin_unlock(&wdt_lock);
+		pm_runtime_put_sync(wdev->dev);
+	}
+	return len;
+}
+
+static long omap_wdt_ioctl(struct file *file, unsigned int cmd,
+						unsigned long arg)
+{
+	struct omap_wdt_dev *wdev;
+	int new_margin;
+	static const struct watchdog_info ident = {
+		.identity = "OMAP Watchdog",
+		.options = WDIOF_SETTIMEOUT,
+		.firmware_version = 0,
+	};
+
+	wdev = file->private_data;
+
+	switch (cmd) {
+	case WDIOC_GETSUPPORT:
+		return copy_to_user((struct watchdog_info __user *)arg, &ident,
+				sizeof(ident));
+	case WDIOC_GETSTATUS:
+		return put_user(0, (int __user *)arg);
+	case WDIOC_GETBOOTSTATUS:
+		if (cpu_is_omap16xx())
+			return put_user(__raw_readw(ARM_SYSST),
+					(int __user *)arg);
+		if (cpu_is_omap24xx())
+			return put_user(omap_prcm_get_reset_sources(),
+					(int __user *)arg);
+		return put_user(0, (int __user *)arg);
+	case WDIOC_KEEPALIVE:
+		pm_runtime_get_sync(wdev->dev);
+		spin_lock(&wdt_lock);
+		omap_wdt_ping(wdev);
+		spin_unlock(&wdt_lock);
+		pm_runtime_put_sync(wdev->dev);
+		return 0;
+	case WDIOC_SETTIMEOUT:
+		if (get_user(new_margin, (int __user *)arg))
+			return -EFAULT;
+		omap_wdt_adjust_timeout(new_margin);
+
+		pm_runtime_get_sync(wdev->dev);
+		spin_lock(&wdt_lock);
+		omap_wdt_disable(wdev);
+		omap_wdt_set_timeout(wdev);
+		omap_wdt_enable(wdev);
+
+		omap_wdt_ping(wdev);
+		spin_unlock(&wdt_lock);
+		pm_runtime_put_sync(wdev->dev);
+		/* Fall */
+	case WDIOC_GETTIMEOUT:
+		return put_user(timer_margin, (int __user *)arg);
+	default:
+		return -ENOTTY;
+	}
+}
+
+static const struct file_operations omap_wdt_fops = {
+	.owner = THIS_MODULE,
+	.write = omap_wdt_write,
+	.unlocked_ioctl = omap_wdt_ioctl,
+	.open = omap_wdt_open,
+	.release = omap_wdt_release,
+	.llseek = no_llseek,
+};
+
+static int __devinit omap_wdt_probe(struct platform_device *pdev)
+{
+	struct resource *res, *mem;
+	struct omap_wdt_dev *wdev;
+	int ret;
+
+	/* reserve static register mappings */
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (!res) {
+		ret = -ENOENT;
+		goto err_get_resource;
+	}
+
+	if (omap_wdt_dev) {
+		ret = -EBUSY;
+		goto err_busy;
+	}
+
+	mem = request_mem_region(res->start, resource_size(res), pdev->name);
+	if (!mem) {
+		ret = -EBUSY;
+		goto err_busy;
+	}
+
+	wdev = kzalloc(sizeof(struct omap_wdt_dev), GFP_KERNEL);
+	if (!wdev) {
+		ret = -ENOMEM;
+		goto err_kzalloc;
+	}
+
+	wdev->omap_wdt_users = 0;
+	wdev->mem = mem;
+	wdev->dev = &pdev->dev;
+
+	wdev->base = ioremap(res->start, resource_size(res));
+	if (!wdev->base) {
+		ret = -ENOMEM;
+		goto err_ioremap;
+	}
+
+	platform_set_drvdata(pdev, wdev);
+
+	pm_runtime_enable(wdev->dev);
+	pm_runtime_get_sync(wdev->dev);
+
+	omap_wdt_disable(wdev);
+	omap_wdt_adjust_timeout(timer_margin);
+
+	wdev->omap_wdt_miscdev.parent = &pdev->dev;
+	wdev->omap_wdt_miscdev.minor = WATCHDOG_MINOR;
+	wdev->omap_wdt_miscdev.name = "watchdog";
+	wdev->omap_wdt_miscdev.fops = &omap_wdt_fops;
+
+	ret = misc_register(&(wdev->omap_wdt_miscdev));
+	if (ret)
+		goto err_misc;
+
+	pr_info("OMAP Watchdog Timer Rev 0x%02x: initial timeout %d sec\n",
+		__raw_readl(wdev->base + OMAP_WATCHDOG_REV) & 0xFF,
+		timer_margin);
+
+	pm_runtime_put_sync(wdev->dev);
+
+	omap_wdt_dev = pdev;
+
+	return 0;
+
+err_misc:
+	pm_runtime_disable(wdev->dev);
+	platform_set_drvdata(pdev, NULL);
+	iounmap(wdev->base);
+
+err_ioremap:
+	wdev->base = NULL;
+	kfree(wdev);
+
+err_kzalloc:
+	release_mem_region(res->start, resource_size(res));
+
+err_busy:
+err_get_resource:
+
+	return ret;
+}
+
+static void omap_wdt_shutdown(struct platform_device *pdev)
+{
+	struct omap_wdt_dev *wdev = platform_get_drvdata(pdev);
+
+	if (wdev->omap_wdt_users) {
+		pm_runtime_get_sync(wdev->dev);
+		omap_wdt_disable(wdev);
+		pm_runtime_put_sync(wdev->dev);
+	}
+}
+
+static int __devexit omap_wdt_remove(struct platform_device *pdev)
+{
+	struct omap_wdt_dev *wdev = platform_get_drvdata(pdev);
+	struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+
+	pm_runtime_disable(wdev->dev);
+	if (!res)
+		return -ENOENT;
+
+	misc_deregister(&(wdev->omap_wdt_miscdev));
+	release_mem_region(res->start, resource_size(res));
+	platform_set_drvdata(pdev, NULL);
+
+	iounmap(wdev->base);
+
+	kfree(wdev);
+	omap_wdt_dev = NULL;
+
+	return 0;
+}
+
+#ifdef	CONFIG_PM
+
+/* REVISIT ... not clear this is the best way to handle system suspend; and
+ * it's very inappropriate for selective device suspend (e.g. suspending this
+ * through sysfs rather than by stopping the watchdog daemon).  Also, this
+ * may not play well enough with NOWAYOUT...
+ */
+
+static int omap_wdt_suspend(struct platform_device *pdev, pm_message_t state)
+{
+	struct omap_wdt_dev *wdev = platform_get_drvdata(pdev);
+
+	if (wdev->omap_wdt_users) {
+		pm_runtime_get_sync(wdev->dev);
+		omap_wdt_disable(wdev);
+		pm_runtime_put_sync(wdev->dev);
+	}
+
+	return 0;
+}
+
+static int omap_wdt_resume(struct platform_device *pdev)
+{
+	struct omap_wdt_dev *wdev = platform_get_drvdata(pdev);
+
+	if (wdev->omap_wdt_users) {
+		pm_runtime_get_sync(wdev->dev);
+		omap_wdt_enable(wdev);
+		omap_wdt_ping(wdev);
+		pm_runtime_put_sync(wdev->dev);
+	}
+
+	return 0;
+}
+
+#else
+#define	omap_wdt_suspend	NULL
+#define	omap_wdt_resume		NULL
+#endif
+
+static struct platform_driver omap_wdt_driver = {
+	.probe		= omap_wdt_probe,
+	.remove		= __devexit_p(omap_wdt_remove),
+	.shutdown	= omap_wdt_shutdown,
+	.suspend	= omap_wdt_suspend,
+	.resume		= omap_wdt_resume,
+	.driver		= {
+		.owner	= THIS_MODULE,
+		.name	= "omap_wdt",
+	},
+};
+
+module_platform_driver(omap_wdt_driver);
+
+MODULE_AUTHOR("George G. Davis");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
+MODULE_ALIAS("platform:omap_wdt");