adds watchdog driver to ar5315

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@12309 3c298f89-4303-0410-b956-a3cf2f4a3e73

1 files changed, 198 insertions, 0 deletions

diff --git a/target/linux/atheros/files/drivers/watchdog/ar2315-wtd.c b/target/linux/atheros/files/drivers/watchdog/ar2315-wtd.c
new file mode 100644
index 0000000000..1737b968f4
--- /dev/null
+++ b/target/linux/atheros/files/drivers/watchdog/ar2315-wtd.c
@@ -0,0 +1,198 @@
+/*
+ * 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.
+ *
+ * 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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ *
+ * Copyright (C) 2008 John Crispin <blogic@openwrt.org>
+ * Based on EP93xx and ifxmips wdt driver
+ */
+
+#include <linux/interrupt.h>
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/types.h>
+#include <linux/miscdevice.h>
+#include <linux/watchdog.h>
+#include <linux/fs.h>
+#include <linux/ioport.h>
+#include <linux/notifier.h>
+#include <linux/reboot.h>
+#include <linux/init.h>
+#include <linux/platform_device.h>
+
+#include <asm/io.h>
+#include <asm/uaccess.h>
+#include <asm/system.h>
+#include <asm/addrspace.h>
+#include <ar531x.h>
+
+#define CLOCK_RATE 40000000
+#define HEARTBEAT(x) (x < 1 || x > 90)?(20):(x)
+
+static int wdt_timeout = 20;
+static int started = 0;
+static int in_use = 0;
+
+static void
+ar2315_wdt_enable(void)
+{
+	sysRegWrite(AR5315_WD, wdt_timeout * CLOCK_RATE);
+	sysRegWrite(AR5315_ISR, 0x80);
+}
+
+static ssize_t
+ar2315_wdt_write(struct file *file, const char __user *data, size_t len, loff_t *ppos)
+{
+	if(len)
+		ar2315_wdt_enable();
+	return len;
+}
+
+static int
+ar2315_wdt_open(struct inode *inode, struct file *file)
+{
+	if(in_use)
+		return -EBUSY;
+	ar2315_wdt_enable();
+	in_use = started = 1;
+	return nonseekable_open(inode, file);
+}
+
+static int
+ar2315_wdt_release(struct inode *inode, struct file *file)
+{
+	in_use = 0;
+	return 0;
+}
+
+static irqreturn_t
+ar2315_wdt_interrupt(int irq, void *dev_id)
+{
+	if(started)
+	{
+		printk(KERN_CRIT "watchdog expired, rebooting system\n");
+		sysRegWrite(AR5315_COLD_RESET, RESET_SYSTEM);
+	} else {
+		sysRegWrite(AR5315_WDC, 0);
+		sysRegWrite(AR5315_WD, 0);
+		sysRegWrite(AR5315_ISR, 0x80);
+	}
+	return IRQ_HANDLED;
+}
+
+static struct watchdog_info ident = {
+	.options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING,
+	.identity = "ar2315 Watchdog",
+};
+
+static int
+ar2315_wdt_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg)
+{
+	int new_wdt_timeout;
+	int ret = -ENOIOCTLCMD;
+
+	switch(cmd)
+	{
+		case WDIOC_GETSUPPORT:
+			ret = copy_to_user((struct watchdog_info __user *)arg, &ident, sizeof(ident)) ? -EFAULT : 0;
+			break;
+
+		case WDIOC_KEEPALIVE:
+			ar2315_wdt_enable();
+			ret = 0;
+			break;
+
+		case WDIOC_SETTIMEOUT:
+			if((ret = get_user(new_wdt_timeout, (int __user *)arg)))
+				break;
+			wdt_timeout = HEARTBEAT(new_wdt_timeout);
+			ar2315_wdt_enable();
+			break;
+
+		case WDIOC_GETTIMEOUT:
+			ret = put_user(wdt_timeout, (int __user *)arg);
+			break;
+	}
+	return ret;
+}
+
+static struct file_operations ar2315_wdt_fops = {
+	.owner		= THIS_MODULE,
+	.llseek		= no_llseek,
+	.write		= ar2315_wdt_write,
+	.ioctl		= ar2315_wdt_ioctl,
+	.open		= ar2315_wdt_open,
+	.release	= ar2315_wdt_release,
+};
+
+static struct miscdevice ar2315_wdt_miscdev = {
+	.minor	= WATCHDOG_MINOR,
+	.name	= "watchdog",
+	.fops	= &ar2315_wdt_fops,
+};
+
+static int
+ar2315_wdt_probe(struct platform_device *dev)
+{
+	int ret = 0;
+
+	ar2315_wdt_enable();
+	ret = request_irq(AR531X_MISC_IRQ_WATCHDOG, ar2315_wdt_interrupt, IRQF_DISABLED, "ar2315_wdt", NULL);
+	if(ret)
+	{
+		printk(KERN_ERR "ar2315wdt: failed to register inetrrupt\n");
+		goto out;
+	}
+
+	ret = misc_register(&ar2315_wdt_miscdev);
+	if(ret)
+		printk(KERN_ERR "ar2315wdt: failed to register miscdev\n");
+
+out:
+	return ret;
+}
+
+static int
+ar2315_wdt_remove(struct platform_device *dev)
+{
+	misc_deregister(&ar2315_wdt_miscdev);
+	free_irq(AR531X_MISC_IRQ_WATCHDOG, NULL);
+	return 0;
+}
+
+static struct platform_driver ar2315_wdt_driver = {
+	.probe = ar2315_wdt_probe,
+	.remove = ar2315_wdt_remove,
+	.driver = {
+		.name = "ar2315_wdt",
+		.owner = THIS_MODULE,
+	},
+};
+
+static int __init
+init_ar2315_wdt(void)
+{
+	int ret = platform_driver_register(&ar2315_wdt_driver);
+	if(ret)
+		printk(KERN_INFO "ar2315_wdt: error registering platfom driver!");
+	return ret;
+}
+
+static void __exit
+exit_ar2315_wdt(void)
+{
+	platform_driver_unregister(&ar2315_wdt_driver);
+}
+
+module_init(init_ar2315_wdt);
+module_exit(exit_ar2315_wdt);