Gitweb:     
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=04bf3b4f5fc033adf921f2e57d034ddbebef5fe7
Commit:     04bf3b4f5fc033adf921f2e57d034ddbebef5fe7
Parent:     62be074147fe2e24359d76a33938df7bccea1e6a
Author:     Florian Fainelli <[EMAIL PROTECTED]>
AuthorDate: Sun May 6 12:55:32 2007 +0200
Committer:  Wim Van Sebroeck <[EMAIL PROTECTED]>
CommitDate: Sun May 6 19:36:45 2007 +0000

    [WATCHDOG] MTX-1 Watchdog driver
    
    This patch adds support for the MTX-1 boards watchdog. If not available the
    board will reboot every 100 seconds. It uses the Linux watchdog and timer
    APIs.
    
    Signed-off-by: Florian Fainelli <[EMAIL PROTECTED]>
    Signed-off-by: Wim Van Sebroeck <[EMAIL PROTECTED]>
---
 drivers/char/watchdog/Kconfig     |    7 +
 drivers/char/watchdog/Makefile    |    1 +
 drivers/char/watchdog/mtx-1_wdt.c |  238 +++++++++++++++++++++++++++++++++++++
 3 files changed, 246 insertions(+), 0 deletions(-)

diff --git a/drivers/char/watchdog/Kconfig b/drivers/char/watchdog/Kconfig
index e2adc7f..1cad32c 100644
--- a/drivers/char/watchdog/Kconfig
+++ b/drivers/char/watchdog/Kconfig
@@ -551,6 +551,13 @@ config INDYDOG
          timer expired and no process has written to /dev/watchdog during
          that time.
 
+config WDT_MTX1
+       tristate "MTX-1 Hardware Watchdog"
+       depends on MIPS_MTX1
+       help
+         Hardware driver for the MTX-1 boards. This is a watchdog timer that
+         will reboot the machine after a 100 seconds timer expired.
+
 config WDT_RM9K_GPI
        tristate "RM9000/GPI hardware watchdog"
        depends on CPU_RM9000
diff --git a/drivers/char/watchdog/Makefile b/drivers/char/watchdog/Makefile
index 387eb80..8bfc00c 100644
--- a/drivers/char/watchdog/Makefile
+++ b/drivers/char/watchdog/Makefile
@@ -72,6 +72,7 @@ obj-$(CONFIG_WATCHDOG_RTAS) += wdrtas.o
 
 # MIPS Architecture
 obj-$(CONFIG_INDYDOG) += indydog.o
+obj-$(CONFIG_WDT_MTX1) += mtx-1_wdt.o
 obj-$(CONFIG_WDT_RM9K_GPI) += rm9k_wdt.o
 
 # S390 Architecture
diff --git a/drivers/char/watchdog/mtx-1_wdt.c 
b/drivers/char/watchdog/mtx-1_wdt.c
new file mode 100644
index 0000000..419ab44
--- /dev/null
+++ b/drivers/char/watchdog/mtx-1_wdt.c
@@ -0,0 +1,238 @@
+/*
+ *      Driver for the MTX-1 Watchdog.
+ *
+ *      (C) Copyright 2005 4G Systems <[EMAIL PROTECTED]>, All Rights Reserved.
+ *                              http://www.4g-systems.biz
+ *
+ *     (C) Copyright 2007 OpenWrt.org, Florian Fainelli <[EMAIL PROTECTED]>
+ *
+ *      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 <[EMAIL PROTECTED]>
+ *
+ *      Release 0.01.
+ *      Author: Michael Stickel  [EMAIL PROTECTED]
+ *
+ *      Release 0.02.
+ *     Author: Florian Fainelli [EMAIL PROTECTED]
+ *             use the Linux watchdog/timer APIs
+ *
+ *      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 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();
+       return count;
+}
+
+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,
+       .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");
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