--- /dev/null
+/*
+ * 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");
+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");
projects / librecmc / librecmc.git / commitdiff