openwrt-xburst/target/linux/au1000-2.6/patches/004-mtx1_watchdog.patch

diff -urN linux-2.6.16.7/drivers/char/watchdog/Kconfig linux-2.6.16.7.new/drivers/char/watchdog/Kconfig
--- linux-2.6.16.7/drivers/char/watchdog/Kconfig	2006-04-17 23:53:25.000000000 +0200
+++ linux-2.6.16.7.new/drivers/char/watchdog/Kconfig	2006-04-22 23:23:53.000000000 +0200
@@ -460,6 +460,14 @@
 	  timer expired and no process has written to /dev/watchdog during
 	  that time.
 
+config MTX1_WATCHDOG
+	tristate "MTX-1 Hardware Watchdog"
+	depends on WATCHDOG && MIPS_MTX1
+	help
+	  Hardware driver for the AccessCube MTX-1 watchdog. This is a
+	  watchdog timer that will reboot the machine after a 100 seconds
+	  timer expired.
+
 # S390 Architecture
 
 config ZVM_WATCHDOG
diff -urN linux-2.6.16.7/drivers/char/watchdog/Makefile linux-2.6.16.7.new/drivers/char/watchdog/Makefile
--- linux-2.6.16.7/drivers/char/watchdog/Makefile	2006-04-17 23:53:25.000000000 +0200
+++ linux-2.6.16.7.new/drivers/char/watchdog/Makefile	2006-04-22 23:21:18.000000000 +0200
@@ -65,6 +65,7 @@
 
 # MIPS Architecture
 obj-$(CONFIG_INDYDOG) += indydog.o
+obj-$(CONFIG_MTX1_WATCHDOG) += mtx-1_watchdog.o
 
 # S390 Architecture
 
diff -urN linux-2.6.16.7/drivers/char/watchdog/mtx-1_watchdog.c linux-2.6.16.7.new/drivers/char/watchdog/mtx-1_watchdog.c
--- linux-2.6.16.7/drivers/char/watchdog/mtx-1_watchdog.c	1970-01-01 01:00:00.000000000 +0100
+++ linux-2.6.16.7.new/drivers/char/watchdog/mtx-1_watchdog.c	2006-04-22 23:20:53.000000000 +0200
@@ -0,0 +1,246 @@
+/*
+ *      Driver for the MTX-1 Watchdog.
+ *
+ *      (c) Copyright 2005 4G Systems <info@4g-systems.biz>, All Rights Reserved.
+ *                              http://www.4g-systems.biz
+ *
+ *      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
+ *
+ *
+ *      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/autoconf.h>
+#include <linux/module.h>
+#include <linux/version.h>
+#include <linux/types.h>
+#include <linux/errno.h>
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/miscdevice.h>
+#include <linux/watchdog.h>
+#include <linux/slab.h>
+#include <linux/init.h>
+#include <asm/uaccess.h>
+#include <linux/fs.h>
+
+#include <asm/mach-au1x00/au1000.h>
+
+#ifndef FALSE
+# define FALSE (0)
+#endif
+
+#ifndef TRUE
+# define TRUE (!FALSE)
+#endif
+
+
+//---------[ Hardware Functions ]-----------------
+
+static void mtx1_trigger_wd (void)
+{
+	/*
+	 * toggle GPIO2_15
+	 */
+
+	u32 tmp = au_readl(GPIO2_DIR);
+	tmp = (tmp & ~(1<<15)) | ((~tmp) & (1<<15));
+	au_writel (tmp, GPIO2_DIR);
+}
+
+static void mtx1_enable_wd (void)
+{
+	au_writel (au_readl(GPIO2_DIR) | (u32)(1<<15), GPIO2_DIR);
+}
+
+static void mtx1_disable_wd (void)
+{
+	au_writel (au_readl(GPIO2_DIR) & ~((u32)(1<<15)), GPIO2_DIR);
+}
+
+
+//---------[ Timer Functions ]-----------------
+
+static struct timer_list   wd_trigger_timer;
+static char                timer_is_running = FALSE;
+
+static void wd_timer_callback (unsigned long data)
+{
+	if (timer_is_running)
+		mod_timer (&wd_trigger_timer, jiffies + 5 * HZ);
+	mtx1_trigger_wd();
+}
+
+static void start_wd_timer (void)
+{
+	if (!timer_is_running) {
+		struct timer_list *t = &wd_trigger_timer;
+		
+		init_timer (t);
+		t->function = wd_timer_callback;
+		t->data     = (unsigned long)0L;
+		t->expires  = jiffies + 5 * HZ;   // 5 seconds.
+		add_timer (t);
+		timer_is_running = TRUE;
+	}
+}
+
+
+
+static void stop_wd_timer (void)
+{
+	if (timer_is_running) {
+		del_timer(&wd_trigger_timer);
+		timer_is_running = FALSE;
+	}
+}
+
+
+//---------[ File Functions ]-----------------
+
+static char restart_after_close;
+
+static int mtx1wd_open (struct inode *inode, struct file *file)
+{
+	if (MINOR(inode->i_rdev) != WATCHDOG_MINOR) return -ENODEV;
+	//MOD_INC_USE_COUNT;
+
+	// stop the timer, if it is running. It will not be
+	// started again, until the module is loaded again.
+	stop_wd_timer();
+
+	// sleep for 2 seconds, to ensure, that the wd is
+	// not triggered more often than every 2 seconds.
+	schedule_timeout (2 * HZ);
+
+	return 0;
+}
+
+
+static int mtx1wd_release (struct inode *inode, struct file *file) {
+	if (MINOR(inode->i_rdev)==WATCHDOG_MINOR) {
+	}
+	if (restart_after_close)
+		start_wd_timer();
+	//MOD_DEC_USE_COUNT;
+	return 0;
+}
+
+
+static ssize_t mtx1wd_write (struct file *file, const char *buf, size_t count, loff_t *ppos) {
+
+	mtx1_trigger_wd ();
+
+	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 0;
+}
+
+static ssize_t mtx1wd_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;
+}
+
+static struct file_operations mtx1wd_fops = {
+	.owner = THIS_MODULE,
+	.read = mtx1wd_read,
+	.write = mtx1wd_write,
+	.open = mtx1wd_open,
+	.release = mtx1wd_release
+};
+
+
+static struct miscdevice mtx1wd_miscdev = {
+	WATCHDOG_MINOR,
+	"watchdog",
+	&mtx1wd_fops
+};
+
+
+
+//---------[ Module Functions ]-----------------
+
+
+static int __init init_mtx1_watchdog(void)
+{
+	printk("MTX-1 watchdog driver\n");
+
+	misc_register(&mtx1wd_miscdev);
+	
+	restart_after_close = 0;
+
+	mtx1_enable_wd ();
+
+	//-- trigger it for the first time.
+	//-- We do not exactly know how long it has not been triggered.
+	mtx1_trigger_wd ();
+
+	// start a timer, that calls mtx1_trigger_wd every 5 seconds.
+	start_wd_timer();
+
+	return 0;
+}
+
+static void __exit exit_mtx1_watchdog(void) {
+
+	// stop the timer, if it is running.
+        stop_wd_timer();
+
+        misc_deregister(&mtx1wd_miscdev);
+
+        mtx1_disable_wd();
+}
+
+module_init(init_mtx1_watchdog);
+module_exit(exit_mtx1_watchdog);
+
+MODULE_AUTHOR("Michael Stickel");
+MODULE_DESCRIPTION("Driver for the MTX-1 watchdog");
+MODULE_LICENSE("GPL");