Update the watchdog driver to make it more linux look alike

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@7100 3c298f89-4303-0410-b956-a3cf2f4a3e73

1 files changed, 280 insertions, 0 deletions

diff --git a/target/linux/au1000-2.6/files/drivers/char/watchdog/mtx-1_watchdog.c b/target/linux/au1000-2.6/files/drivers/char/watchdog/mtx-1_watchdog.c
new file mode 100644
index 000000000..ccd631ed3
--- /dev/null
+++ b/target/linux/au1000-2.6/files/drivers/char/watchdog/mtx-1_watchdog.c
@@ -0,0 +1,280 @@
+/*
+ *      Driver for the MTX-1 Watchdog.
+ *
+ *      (c) Copyright 2005 4G Systems <info@4g-systems.biz>, All Rights Reserved.
+ *                              http://www.4g-systems.biz
+ *
+ * 	(C) Copyright 2007 OpenWrt.org, Florian Fainelli <florian@openwrt.org>
+ *
+ *      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.
+ *
+ *      Neither Michael Stickel nor 4G Systems admit liability nor provide
+ *      warranty for any of this software. This material is provided
+ *      "AS-IS" and at no charge.
+ *
+ *      (c) Copyright 2005    4G Systems <info@4g-systems.biz>
+ *
+ *      Release 0.01.
+ *
+ *      Author: Michael Stickel  michael.stickel@4g-systems.biz
+ *
+ *      Release 0.02.
+ *	Author: Florian Fainelli florian@openwrt.org
+ *		use the Linux watchdog API
+ *
+ *      The Watchdog is configured to reset the MTX-1
+ *      if it is not triggered for 100 seconds.
+ *      It should not be triggered more often than 1.6 seconds.
+ *
+ *      A timer triggers the watchdog every 5 seconds, until
+ *      it is opened for the first time. After the first open
+ *      it MUST be triggered every 2..95 seconds.
+ */
+
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/types.h>
+#include <linux/errno.h>
+#include <linux/miscdevice.h>
+#include <linux/fs.h>
+#include <linux/init.h>
+#include <linux/ioport.h>
+#include <linux/timer.h>
+#include <linux/completion.h>
+#include <linux/jiffies.h>
+#include <linux/watchdog.h>
+#include <asm/io.h>
+#include <asm/uaccess.h>
+
+#include <asm/mach-au1x00/au1000.h>
+
+#define MTX1_WDT_INTERVAL	(5 * HZ)
+
+static int ticks = 100 * HZ;
+
+static struct {
+	struct completion stop;
+	volatile int running;
+	struct timer_list timer;
+	volatile int queue;
+	int default_ticks;
+	unsigned long inuse;
+} mtx1_wdt_device;
+
+static void mtx1_wdt_trigger(unsigned long unused)
+{
+	u32 tmp;
+
+	if (mtx1_wdt_device.running)
+		ticks--;
+	/*
+	 * toggle GPIO2_15
+	 */
+	tmp = au_readl(GPIO2_DIR);
+	tmp = (tmp & ~(1<<15)) | ((~tmp) & (1<<15));
+	au_writel (tmp, GPIO2_DIR);
+
+	if (mtx1_wdt_device.queue && ticks)
+		mod_timer(&mtx1_wdt_device.timer, jiffies + MTX1_WDT_INTERVAL);
+	else {
+		complete(&mtx1_wdt_device.stop);
+	}
+}
+
+static void mtx1_wdt_reset(void)
+{
+	ticks = mtx1_wdt_device.default_ticks;
+}
+
+
+static void mtx1_wdt_start(void)
+{
+	if (!mtx1_wdt_device.queue) {
+		mtx1_wdt_device.queue = 1;
+		au_writel (au_readl(GPIO2_DIR) | (u32)(1<<15), GPIO2_DIR);
+		mod_timer(&mtx1_wdt_device.timer, jiffies + MTX1_WDT_INTERVAL);
+	}
+	mtx1_wdt_device.running++;
+}
+
+static int mtx1_wdt_stop(void)
+{
+	if (mtx1_wdt_device.queue) {
+		mtx1_wdt_device.queue = 0;
+		au_writel (au_readl(GPIO2_DIR) & ~((u32)(1<<15)), GPIO2_DIR);
+	}
+
+	ticks = mtx1_wdt_device.default_ticks;
+
+	return 0;
+}
+
+/* Filesystem functions */
+
+static char restart_after_close;
+
+static int mtx1_wdt_open(struct inode *inode, struct file *file)
+{
+	if (test_and_set_bit(0, &mtx1_wdt_device.inuse))
+		return -EBUSY;
+
+	return nonseekable_open(inode, file);
+}
+
+
+static int mtx1_wdt_release(struct inode *inode, struct file *file)
+{
+	clear_bit(0, &mtx1_wdt_device.inuse);
+	return 0;
+}
+
+static int mtx1_wdt_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg)
+{
+        void __user *argp = (void __user *)arg;
+        unsigned int value;
+        static struct watchdog_info ident =
+        {
+                .options = WDIOF_CARDRESET,
+                .identity = "MTX-1 WDT",
+        };
+
+        switch(cmd) {
+                case WDIOC_KEEPALIVE:
+                        mtx1_wdt_reset();
+                        break;
+                case WDIOC_GETSTATUS:
+                        if ( copy_to_user(argp, &value, sizeof(int)) )
+                                return -EFAULT;
+                        break;
+                case WDIOC_GETSUPPORT:
+                        if ( copy_to_user(argp, &ident, sizeof(ident)) )
+                                return -EFAULT;
+                        break;
+                case WDIOC_SETOPTIONS:
+                        if ( copy_from_user(&value, argp, sizeof(int)) )
+                                return -EFAULT;
+                        switch(value) {
+                                case WDIOS_ENABLECARD:
+                                        mtx1_wdt_start();
+                                        break;
+                                case WDIOS_DISABLECARD:
+                                        return mtx1_wdt_stop();
+                                default:
+                                        return -EINVAL;
+                        }
+                        break;
+                default:
+                        return -ENOTTY;
+        }
+        return 0;
+}
+
+
+static ssize_t mtx1_wdt_write(struct file *file, const char *buf, size_t count, loff_t *ppos)
+{
+	if (!count)
+		return -EIO;
+
+	mtx1_wdt_reset();
+
+	if (count > 0) {
+               char buffer[10];
+               int n = (count>9)?9:count;
+
+               if (copy_from_user (&buffer, buf, n))
+                       return -EFAULT;
+               buffer[n]=0;
+
+               if (count >= 4 && strncmp("auto", buffer, 4)==0)
+                       restart_after_close = 1;
+
+               else if (count >= 6 && strncmp("manual", buffer, 6)==0)
+                       restart_after_close = 0;
+
+               return n;
+	}
+	return count;
+}
+
+#if 0
+static ssize_t mtx1_wdt_read (struct file *file, char *buf, size_t count, loff_t *ppos)
+{
+       char * state = restart_after_close ? "auto\n" : "manual\n";
+       int n = strlen(state)+1;
+
+       if (file->f_pos >= n)
+               return 0;
+
+       if (count < n)
+               return -EINVAL;
+
+       if(copy_to_user(buf, state, n))
+               return -EFAULT;
+
+       file->f_pos += n;
+
+       return n;
+}
+#endif
+
+static struct file_operations mtx1_wdt_fops = {
+	.owner 		= THIS_MODULE,
+	.llseek		= no_llseek,
+	.ioctl		= mtx1_wdt_ioctl,
+	.open 		= mtx1_wdt_open,
+	.write 		= mtx1_wdt_write,
+	//.read 		= mtx1_wdt_read,
+	.release 	= mtx1_wdt_release
+};
+
+
+static struct miscdevice mtx1_wdt_misc = {
+	.minor 	= WATCHDOG_MINOR,
+	.name 	= "watchdog",
+	.fops 	= &mtx1_wdt_fops
+};
+
+
+static int __init mtx1_wdt_init(void)
+{
+	int ret;
+
+	if ((ret = misc_register(&mtx1_wdt_misc)) < 0) {
+		printk(KERN_ERR " mtx-1_wdt : failed to register\n");
+		return ret;
+	}
+
+	init_completion(&mtx1_wdt_device.stop);
+	mtx1_wdt_device.queue = 0;
+
+	clear_bit(0, &mtx1_wdt_device.inuse);
+	
+	setup_timer(&mtx1_wdt_device.timer, mtx1_wdt_trigger, 0L);
+
+	mtx1_wdt_device.default_ticks = ticks;
+
+	mtx1_wdt_start();
+	
+	printk(KERN_INFO "MTX-1 Watchdog driver\n");
+	
+	return 0;
+}
+
+static void __exit mtx1_wdt_exit(void)
+{
+	if (mtx1_wdt_device.queue) {
+		mtx1_wdt_device.queue = 0;
+		wait_for_completion(&mtx1_wdt_device.stop);
+	}
+        misc_deregister(&mtx1_wdt_misc);
+}
+
+module_init(mtx1_wdt_init);
+module_exit(mtx1_wdt_exit);
+
+MODULE_AUTHOR("Michael Stickel, Florian Fainelli");
+MODULE_DESCRIPTION("Driver for the MTX-1 watchdog");
+MODULE_LICENSE("GPL");