1 files changed, 325 insertions, 0 deletions

diff --git a/drivers/watchdog/wafer5823wdt.c b/drivers/watchdog/wafer5823wdt.c
new file mode 100644
index 000000000000..950905d3c39f
--- /dev/null
+++ b/drivers/watchdog/wafer5823wdt.c
@@ -0,0 +1,325 @@
+/*
+ *      ICP Wafer 5823 Single Board Computer WDT driver
+ *      http://www.icpamerica.com/wafer_5823.php
+ *      May also work on other similar models
+ *
+ *      (c) Copyright 2002 Justin Cormack <justin@street-vision.com>
+ *
+ *      Release 0.02
+ *
+ *      Based on advantechwdt.c which is based on wdt.c.
+ *      Original copyright messages:
+ *
+ *      (c) Copyright 1996-1997 Alan Cox <alan@redhat.com>, All Rights Reserved.
+ *                              http://www.redhat.com
+ *
+ *      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 Alan Cox nor CymruNet Ltd. admit liability nor provide
+ *      warranty for any of this software. This material is provided
+ *      "AS-IS" and at no charge.
+ *
+ *      (c) Copyright 1995    Alan Cox <alan@lxorguk.ukuu.org.uk>
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/miscdevice.h>
+#include <linux/watchdog.h>
+#include <linux/fs.h>
+#include <linux/ioport.h>
+#include <linux/notifier.h>
+#include <linux/reboot.h>
+#include <linux/init.h>
+#include <linux/spinlock.h>
+#include <asm/io.h>
+#include <asm/uaccess.h>
+
+#define WATCHDOG_NAME "Wafer 5823 WDT"
+#define PFX WATCHDOG_NAME ": "
+#define WD_TIMO 60                      /* 60 sec default timeout */
+
+static unsigned long wafwdt_is_open;
+static char expect_close;
+static spinlock_t wafwdt_lock;
+
+/*
+ *      You must set these - there is no sane way to probe for this board.
+ *
+ *      To enable, write the timeout value in seconds (1 to 255) to I/O
+ *      port WDT_START, then read the port to start the watchdog. To pat
+ *      the dog, read port WDT_STOP to stop the timer, then read WDT_START
+ *      to restart it again.
+ */
+
+static int wdt_stop = 0x843;
+static int wdt_start = 0x443;
+
+static int timeout = WD_TIMO;  /* in seconds */
+module_param(timeout, int, 0);
+MODULE_PARM_DESC(timeout, "Watchdog timeout in seconds. 1<= timeout <=255, default=" __MODULE_STRING(WD_TIMO) ".");
+
+static int nowayout = WATCHDOG_NOWAYOUT;
+module_param(nowayout, int, 0);
+MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=" __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
+
+static void wafwdt_ping(void)
+{
+        /* pat watchdog */
+        spin_lock(&wafwdt_lock);
+        inb_p(wdt_stop);
+        inb_p(wdt_start);
+        spin_unlock(&wafwdt_lock);
+}
+
+static void wafwdt_start(void)
+{
+        /* start up watchdog */
+        outb_p(timeout, wdt_start);
+        inb_p(wdt_start);
+}
+
+static void
+wafwdt_stop(void)
+{
+        /* stop watchdog */
+        inb_p(wdt_stop);
+}
+
+static ssize_t wafwdt_write(struct file *file, const char __user *buf, size_t count, loff_t * ppos)
+{
+        /* See if we got the magic character 'V' and reload the timer */
+        if (count) {
+                if (!nowayout) {
+                        size_t i;
+
+                        /* In case it was set long ago */
+                        expect_close = 0;
+
+                        /* scan to see whether or not we got the magic character */
+                        for (i = 0; i != count; i++) {
+                                char c;
+                                if (get_user(c, buf + i))
+                                        return -EFAULT;
+                                if (c == 'V')
+                                        expect_close = 42;
+                        }
+                }
+                /* Well, anyhow someone wrote to us, we should return that favour */
+                wafwdt_ping();
+        }
+        return count;
+}
+
+static int wafwdt_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
+             unsigned long arg)
+{
+        int new_timeout;
+        void __user *argp = (void __user *)arg;
+        int __user *p = argp;
+        static struct watchdog_info ident = {
+                .options = WDIOF_KEEPALIVEPING | WDIOF_SETTIMEOUT | WDIOF_MAGICCLOSE,
+                .firmware_version = 1,
+                .identity = "Wafer 5823 WDT",
+        };
+
+        switch (cmd) {
+        case WDIOC_GETSUPPORT:
+                if (copy_to_user(argp, &ident, sizeof (ident)))
+                        return -EFAULT;
+                break;
+
+        case WDIOC_GETSTATUS:
+        case WDIOC_GETBOOTSTATUS:
+                return put_user(0, p);
+
+        case WDIOC_KEEPALIVE:
+                wafwdt_ping();
+                break;
+
+        case WDIOC_SETTIMEOUT:
+                if (get_user(new_timeout, p))
+                        return -EFAULT;
+                if ((new_timeout < 1) || (new_timeout > 255))
+                        return -EINVAL;
+                timeout = new_timeout;
+                wafwdt_stop();
+                wafwdt_start();
+                /* Fall */
+        case WDIOC_GETTIMEOUT:
+                return put_user(timeout, p);
+
+        case WDIOC_SETOPTIONS:
+        {
+                int options, retval = -EINVAL;
+
+                if (get_user(options, p))
+                        return -EFAULT;
+
+                if (options & WDIOS_DISABLECARD) {
+                        wafwdt_start();
+                        retval = 0;
+                }
+
+                if (options & WDIOS_ENABLECARD) {
+                        wafwdt_stop();
+                        retval = 0;
+                }
+
+                return retval;
+        }
+
+        default:
+                return -ENOTTY;
+        }
+        return 0;
+}
+
+static int wafwdt_open(struct inode *inode, struct file *file)
+{
+        if (test_and_set_bit(0, &wafwdt_is_open))
+                return -EBUSY;
+
+        /*
+         *      Activate
+         */
+        wafwdt_start();
+        return nonseekable_open(inode, file);
+}
+
+static int
+wafwdt_close(struct inode *inode, struct file *file)
+{
+        if (expect_close == 42) {
+                wafwdt_stop();
+        } else {
+                printk(KERN_CRIT PFX "WDT device closed unexpectedly.  WDT will not stop!\n");
+                wafwdt_ping();
+        }
+        clear_bit(0, &wafwdt_is_open);
+        expect_close = 0;
+        return 0;
+}
+
+/*
+ *      Notifier for system down
+ */
+
+static int wafwdt_notify_sys(struct notifier_block *this, unsigned long code, void *unused)
+{
+        if (code == SYS_DOWN || code == SYS_HALT) {
+                /* Turn the WDT off */
+                wafwdt_stop();
+        }
+        return NOTIFY_DONE;
+}
+
+/*
+ *      Kernel Interfaces
+ */
+
+static const struct file_operations wafwdt_fops = {
+        .owner          = THIS_MODULE,
+        .llseek         = no_llseek,
+        .write          = wafwdt_write,
+        .ioctl          = wafwdt_ioctl,
+        .open           = wafwdt_open,
+        .release        = wafwdt_close,
+};
+
+static struct miscdevice wafwdt_miscdev = {
+        .minor  = WATCHDOG_MINOR,
+        .name   = "watchdog",
+        .fops   = &wafwdt_fops,
+};
+
+/*
+ *      The WDT needs to learn about soft shutdowns in order to
+ *      turn the timebomb registers off.
+ */
+
+static struct notifier_block wafwdt_notifier = {
+        .notifier_call = wafwdt_notify_sys,
+};
+
+static int __init wafwdt_init(void)
+{
+        int ret;
+
+        printk(KERN_INFO "WDT driver for Wafer 5823 single board computer initialising.\n");
+
+        spin_lock_init(&wafwdt_lock);
+
+        if (timeout < 1 || timeout > 255) {
+                timeout = WD_TIMO;
+                printk (KERN_INFO PFX "timeout value must be 1<=x<=255, using %d\n",
+                        timeout);
+        }
+
+        if (wdt_stop != wdt_start) {
+                if(!request_region(wdt_stop, 1, "Wafer 5823 WDT")) {
+                        printk (KERN_ERR PFX "I/O address 0x%04x already in use\n",
+                        wdt_stop);
+                        ret = -EIO;
+                        goto error;
+                }
+        }
+
+        if(!request_region(wdt_start, 1, "Wafer 5823 WDT")) {
+                printk (KERN_ERR PFX "I/O address 0x%04x already in use\n",
+                        wdt_start);
+                ret = -EIO;
+                goto error2;
+        }
+
+        ret = register_reboot_notifier(&wafwdt_notifier);
+        if (ret != 0) {
+                printk (KERN_ERR PFX "cannot register reboot notifier (err=%d)\n",
+                        ret);
+                goto error3;
+        }
+
+        ret = misc_register(&wafwdt_miscdev);
+        if (ret != 0) {
+                printk (KERN_ERR PFX "cannot register miscdev on minor=%d (err=%d)\n",
+                        WATCHDOG_MINOR, ret);
+                goto error4;
+        }
+
+        printk (KERN_INFO PFX "initialized. timeout=%d sec (nowayout=%d)\n",
+                timeout, nowayout);
+
+        return ret;
+error4:
+        unregister_reboot_notifier(&wafwdt_notifier);
+error3:
+        release_region(wdt_start, 1);
+error2:
+        if (wdt_stop != wdt_start)
+                release_region(wdt_stop, 1);
+error:
+        return ret;
+}
+
+static void __exit wafwdt_exit(void)
+{
+        misc_deregister(&wafwdt_miscdev);
+        unregister_reboot_notifier(&wafwdt_notifier);
+        if(wdt_stop != wdt_start)
+                release_region(wdt_stop, 1);
+        release_region(wdt_start, 1);
+}
+
+module_init(wafwdt_init);
+module_exit(wafwdt_exit);
+
+MODULE_AUTHOR("Justin Cormack");
+MODULE_DESCRIPTION("ICP Wafer 5823 Single Board Computer WDT driver");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
+
+/* end of wafer5823wdt.c */