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280 lines
7.1 KiB
Diff
280 lines
7.1 KiB
Diff
diff -urN linux-2.6.16.7/drivers/char/watchdog/Kconfig linux-2.6.16.7.new/drivers/char/watchdog/Kconfig
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--- linux-2.6.16.7/drivers/char/watchdog/Kconfig 2006-04-17 23:53:25.000000000 +0200
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+++ linux-2.6.16.7.new/drivers/char/watchdog/Kconfig 2006-04-22 23:23:53.000000000 +0200
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@@ -460,6 +460,14 @@
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timer expired and no process has written to /dev/watchdog during
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that time.
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+config MTX1_WATCHDOG
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+ tristate "MTX-1 Hardware Watchdog"
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+ depends on WATCHDOG && MIPS_MTX1
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+ help
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+ Hardware driver for the AccessCube MTX-1 watchdog. This is a
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+ watchdog timer that will reboot the machine after a 100 seconds
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+ timer expired.
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+
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# S390 Architecture
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config ZVM_WATCHDOG
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diff -urN linux-2.6.16.7/drivers/char/watchdog/Makefile linux-2.6.16.7.new/drivers/char/watchdog/Makefile
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--- linux-2.6.16.7/drivers/char/watchdog/Makefile 2006-04-17 23:53:25.000000000 +0200
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+++ linux-2.6.16.7.new/drivers/char/watchdog/Makefile 2006-04-22 23:21:18.000000000 +0200
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@@ -65,6 +65,7 @@
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# MIPS Architecture
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obj-$(CONFIG_INDYDOG) += indydog.o
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+obj-$(CONFIG_MTX1_WATCHDOG) += mtx-1_watchdog.o
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# S390 Architecture
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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
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--- linux-2.6.16.7/drivers/char/watchdog/mtx-1_watchdog.c 1970-01-01 01:00:00.000000000 +0100
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+++ linux-2.6.16.7.new/drivers/char/watchdog/mtx-1_watchdog.c 2006-04-22 23:20:53.000000000 +0200
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@@ -0,0 +1,246 @@
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+/*
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+ * Driver for the MTX-1 Watchdog.
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+ *
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+ * (c) Copyright 2005 4G Systems <info@4g-systems.biz>, All Rights Reserved.
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+ * http://www.4g-systems.biz
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+ *
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+ * This program is free software; you can redistribute it and/or
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+ * modify it under the terms of the GNU General Public License
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+ * as published by the Free Software Foundation; either version
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+ * 2 of the License, or (at your option) any later version.
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+ *
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+ * Neither Michael Stickel nor 4G Systems admit liability nor provide
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+ * warranty for any of this software. This material is provided
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+ * "AS-IS" and at no charge.
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+ *
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+ * (c) Copyright 2005 4G Systems <info@4g-systems.biz>
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+ *
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+ * Release 0.01.
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+ *
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+ * Author: Michael Stickel michael.stickel@4g-systems.biz
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+ *
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+ *
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+ * The Watchdog is configured to reset the MTX-1
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+ * if it is not triggered for 100 seconds.
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+ * It should not be triggered more often than 1.6 seconds.
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+ *
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+ * A timer triggers the watchdog every 5 seconds, until
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+ * it is opened for the first time. After the first open
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+ * it MUST be triggered every 2..95 seconds.
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+ */
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+#include <linux/config.h>
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+#include <linux/module.h>
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+#include <linux/version.h>
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+#include <linux/types.h>
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+#include <linux/errno.h>
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+#include <linux/kernel.h>
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+#include <linux/sched.h>
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+#include <linux/miscdevice.h>
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+#include <linux/watchdog.h>
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+#include <linux/slab.h>
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+#include <linux/init.h>
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+#include <asm/uaccess.h>
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+#include <linux/fs.h>
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+
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+#include <asm/mach-au1x00/au1000.h>
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+
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+#ifndef FALSE
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+# define FALSE (0)
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+#endif
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+
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+#ifndef TRUE
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+# define TRUE (!FALSE)
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+#endif
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+
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+
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+//---------[ Hardware Functions ]-----------------
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+
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+static void mtx1_trigger_wd (void)
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+{
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+ /*
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+ * toggle GPIO2_15
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+ */
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+
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+ u32 tmp = au_readl(GPIO2_DIR);
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+ tmp = (tmp & ~(1<<15)) | ((~tmp) & (1<<15));
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+ au_writel (tmp, GPIO2_DIR);
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+}
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+
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+static void mtx1_enable_wd (void)
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+{
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+ au_writel (au_readl(GPIO2_DIR) | (u32)(1<<15), GPIO2_DIR);
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+}
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+
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+static void mtx1_disable_wd (void)
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+{
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+ au_writel (au_readl(GPIO2_DIR) & ~((u32)(1<<15)), GPIO2_DIR);
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+}
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+
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+
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+//---------[ Timer Functions ]-----------------
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+
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+static struct timer_list wd_trigger_timer;
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+static char timer_is_running = FALSE;
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+
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+static void wd_timer_callback (unsigned long data)
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+{
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+ if (timer_is_running)
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+ mod_timer (&wd_trigger_timer, jiffies + 5 * HZ);
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+ mtx1_trigger_wd();
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+}
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+
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+static void start_wd_timer (void)
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+{
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+ if (!timer_is_running) {
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+ struct timer_list *t = &wd_trigger_timer;
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+
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+ init_timer (t);
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+ t->function = wd_timer_callback;
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+ t->data = (unsigned long)0L;
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+ t->expires = jiffies + 5 * HZ; // 5 seconds.
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+ add_timer (t);
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+ timer_is_running = TRUE;
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+ }
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+}
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+
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+
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+
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+static void stop_wd_timer (void)
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+{
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+ if (timer_is_running) {
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+ del_timer(&wd_trigger_timer);
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+ timer_is_running = FALSE;
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+ }
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+}
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+
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+
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+//---------[ File Functions ]-----------------
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+
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+static char restart_after_close;
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+
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+static int mtx1wd_open (struct inode *inode, struct file *file)
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+{
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+ if (MINOR(inode->i_rdev) != WATCHDOG_MINOR) return -ENODEV;
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+ //MOD_INC_USE_COUNT;
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+
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+ // stop the timer, if it is running. It will not be
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+ // started again, until the module is loaded again.
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+ stop_wd_timer();
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+
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+ // sleep for 2 seconds, to ensure, that the wd is
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+ // not triggered more often than every 2 seconds.
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+ schedule_timeout (2 * HZ);
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+
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+ return 0;
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+}
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+
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+
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+static int mtx1wd_release (struct inode *inode, struct file *file) {
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+ if (MINOR(inode->i_rdev)==WATCHDOG_MINOR) {
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+ }
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+ if (restart_after_close)
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+ start_wd_timer();
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+ //MOD_DEC_USE_COUNT;
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+ return 0;
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+}
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+
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+
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+static ssize_t mtx1wd_write (struct file *file, const char *buf, size_t count, loff_t *ppos) {
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+
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+ mtx1_trigger_wd ();
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+
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+ if (count > 0) {
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+ char buffer[10];
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+ int n = (count>9)?9:count;
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+
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+ if (copy_from_user (&buffer, buf, n))
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+ return -EFAULT;
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+ buffer[n]=0;
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+
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+ if (count >= 4 && strncmp("auto", buffer, 4)==0)
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+ restart_after_close = 1;
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+
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+ else if (count >= 6 && strncmp("manual", buffer, 6)==0)
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+ restart_after_close = 0;
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+
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+ return n;
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+ }
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+
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+ return 0;
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+}
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+
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+static ssize_t mtx1wd_read (struct file *file, char *buf, size_t count, loff_t *ppos)
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+{
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+ char * state = restart_after_close ? "auto\n" : "manual\n";
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+ int n = strlen(state)+1;
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+
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+ if (file->f_pos >= n)
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+ return 0;
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+
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+ if (count < n)
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+ return -EINVAL;
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+
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+ if(copy_to_user(buf, state, n))
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+ return -EFAULT;
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+
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+ file->f_pos += n;
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+
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+ return n;
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+}
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+
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+static struct file_operations mtx1wd_fops = {
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+ .owner = THIS_MODULE,
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+ .read = mtx1wd_read,
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+ .write = mtx1wd_write,
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+ .open = mtx1wd_open,
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+ .release = mtx1wd_release
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+};
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+
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+
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+static struct miscdevice mtx1wd_miscdev = {
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+ WATCHDOG_MINOR,
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+ "watchdog",
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+ &mtx1wd_fops
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+};
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+
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+
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+
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+//---------[ Module Functions ]-----------------
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+
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+
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+static int __init init_mtx1_watchdog(void)
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+{
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+ printk("MTX-1 watchdog driver\n");
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+
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+ misc_register(&mtx1wd_miscdev);
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+
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+ restart_after_close = 0;
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+
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+ mtx1_enable_wd ();
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+
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+ //-- trigger it for the first time.
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+ //-- We do not exactly know how long it has not been triggered.
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+ mtx1_trigger_wd ();
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+
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+ // start a timer, that calls mtx1_trigger_wd every 5 seconds.
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+ start_wd_timer();
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+
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+ return 0;
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+}
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+
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+static void __exit exit_mtx1_watchdog(void) {
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+
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+ // stop the timer, if it is running.
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+ stop_wd_timer();
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+
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+ misc_deregister(&mtx1wd_miscdev);
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+
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+ mtx1_disable_wd();
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+}
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+
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+module_init(init_mtx1_watchdog);
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+module_exit(exit_mtx1_watchdog);
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+
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+MODULE_AUTHOR("Michael Stickel");
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+MODULE_DESCRIPTION("Driver for the MTX-1 watchdog");
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+MODULE_LICENSE("GPL");
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