1 files changed, 306 insertions, 0 deletions

diff --git a/drivers/char/watchdog/mixcomwd.c b/drivers/char/watchdog/mixcomwd.c
new file mode 100644
index 000000000000..3143e4a07535
--- /dev/null
+++ b/drivers/char/watchdog/mixcomwd.c
@@ -0,0 +1,306 @@
+/*
+ * MixCom Watchdog: A Simple Hardware Watchdog Device
+ * Based on Softdog driver by Alan Cox and PC Watchdog driver by Ken Hollis
+ *
+ * Author: Gergely Madarasz <gorgo@itc.hu>
+ *
+ * Copyright (c) 1999 ITConsult-Pro Co. <info@itc.hu>
+ *
+ * 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.
+ *
+ * Version 0.1 (99/04/15):
+ *              - first version
+ *
+ * Version 0.2 (99/06/16):
+ *              - added kernel timer watchdog ping after close
+ *                since the hardware does not support watchdog shutdown
+ *
+ * Version 0.3 (99/06/21):
+ *              - added WDIOC_GETSTATUS and WDIOC_GETSUPPORT ioctl calls
+ *
+ * Version 0.3.1 (99/06/22):
+ *              - allow module removal while internal timer is active,
+ *                print warning about probable reset
+ *
+ * Version 0.4 (99/11/15):
+ *              - support for one more type board
+ *
+ * Version 0.5 (2001/12/14) Matt Domsch <Matt_Domsch@dell.com>
+ *              - added nowayout module option to override CONFIG_WATCHDOG_NOWAYOUT
+ *
+ */
+
+#define VERSION "0.5"
+
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/config.h>
+#include <linux/types.h>
+#include <linux/miscdevice.h>
+#include <linux/ioport.h>
+#include <linux/watchdog.h>
+#include <linux/fs.h>
+#include <linux/reboot.h>
+#include <linux/init.h>
+#include <asm/uaccess.h>
+#include <asm/io.h>
+
+static int mixcomwd_ioports[] = { 0x180, 0x280, 0x380, 0x000 };
+
+#define MIXCOM_WATCHDOG_OFFSET 0xc10
+#define MIXCOM_ID 0x11
+#define FLASHCOM_WATCHDOG_OFFSET 0x4
+#define FLASHCOM_ID 0x18
+
+static unsigned long mixcomwd_opened; /* long req'd for setbit --RR */
+
+static int watchdog_port;
+static int mixcomwd_timer_alive;
+static struct timer_list mixcomwd_timer = TIMER_INITIALIZER(NULL, 0, 0);
+static char expect_close;
+
+#ifdef CONFIG_WATCHDOG_NOWAYOUT
+static int nowayout = 1;
+#else
+static int nowayout = 0;
+#endif
+
+module_param(nowayout, int, 0);
+MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=CONFIG_WATCHDOG_NOWAYOUT)");
+
+static void mixcomwd_ping(void)
+{
+        outb_p(55,watchdog_port);
+        return;
+}
+
+static void mixcomwd_timerfun(unsigned long d)
+{
+        mixcomwd_ping();
+
+        mod_timer(&mixcomwd_timer,jiffies+ 5*HZ);
+}
+
+/*
+ *      Allow only one person to hold it open
+ */
+
+static int mixcomwd_open(struct inode *inode, struct file *file)
+{
+        if(test_and_set_bit(0,&mixcomwd_opened)) {
+                return -EBUSY;
+        }
+        mixcomwd_ping();
+
+        if (nowayout) {
+                /*
+                 * fops_get() code via open() has already done
+                 * a try_module_get() so it is safe to do the
+                 * __module_get().
+                 */
+                __module_get(THIS_MODULE);
+        } else {
+                if(mixcomwd_timer_alive) {
+                        del_timer(&mixcomwd_timer);
+                        mixcomwd_timer_alive=0;
+                }
+        }
+        return nonseekable_open(inode, file);
+}
+
+static int mixcomwd_release(struct inode *inode, struct file *file)
+{
+        if (expect_close == 42) {
+                if(mixcomwd_timer_alive) {
+                        printk(KERN_ERR "mixcomwd: release called while internal timer alive");
+                        return -EBUSY;
+                }
+                init_timer(&mixcomwd_timer);
+                mixcomwd_timer.expires=jiffies + 5 * HZ;
+                mixcomwd_timer.function=mixcomwd_timerfun;
+                mixcomwd_timer.data=0;
+                mixcomwd_timer_alive=1;
+                add_timer(&mixcomwd_timer);
+        } else {
+                printk(KERN_CRIT "mixcomwd: WDT device closed unexpectedly.  WDT will not stop!\n");
+        }
+
+        clear_bit(0,&mixcomwd_opened);
+        expect_close=0;
+        return 0;
+}
+
+
+static ssize_t mixcomwd_write(struct file *file, const char __user *data, size_t len, loff_t *ppos)
+{
+        if(len)
+        {
+                if (!nowayout) {
+                        size_t i;
+
+                        /* In case it was set long ago */
+                        expect_close = 0;
+
+                        for (i = 0; i != len; i++) {
+                                char c;
+                                if (get_user(c, data + i))
+                                        return -EFAULT;
+                                if (c == 'V')
+                                        expect_close = 42;
+                        }
+                }
+                mixcomwd_ping();
+        }
+        return len;
+}
+
+static int mixcomwd_ioctl(struct inode *inode, struct file *file,
+        unsigned int cmd, unsigned long arg)
+{
+        void __user *argp = (void __user *)arg;
+        int __user *p = argp;
+        int status;
+        static struct watchdog_info ident = {
+                .options = WDIOF_KEEPALIVEPING | WDIOF_MAGICCLOSE,
+                .firmware_version = 1,
+                .identity = "MixCOM watchdog",
+        };
+
+        switch(cmd)
+        {
+                case WDIOC_GETSTATUS:
+                        status=mixcomwd_opened;
+                        if (!nowayout) {
+                                status|=mixcomwd_timer_alive;
+                        }
+                        if (copy_to_user(p, &status, sizeof(int))) {
+                                return -EFAULT;
+                        }
+                        break;
+                case WDIOC_GETSUPPORT:
+                        if (copy_to_user(argp, &ident, sizeof(ident))) {
+                                return -EFAULT;
+                        }
+                        break;
+                case WDIOC_KEEPALIVE:
+                        mixcomwd_ping();
+                        break;
+                default:
+                        return -ENOIOCTLCMD;
+        }
+        return 0;
+}
+
+static struct file_operations mixcomwd_fops=
+{
+        .owner          = THIS_MODULE,
+        .llseek         = no_llseek,
+        .write          = mixcomwd_write,
+        .ioctl          = mixcomwd_ioctl,
+        .open           = mixcomwd_open,
+        .release        = mixcomwd_release,
+};
+
+static struct miscdevice mixcomwd_miscdev=
+{
+        .minor  = WATCHDOG_MINOR,
+        .name   = "watchdog",
+        .fops   = &mixcomwd_fops,
+};
+
+static int __init mixcomwd_checkcard(int port)
+{
+        int id;
+
+        port += MIXCOM_WATCHDOG_OFFSET;
+        if (!request_region(port, 1, "MixCOM watchdog")) {
+                return 0;
+        }
+
+        id=inb_p(port) & 0x3f;
+        if(id!=MIXCOM_ID) {
+                release_region(port, 1);
+                return 0;
+        }
+        return port;
+}
+
+static int __init flashcom_checkcard(int port)
+{
+        int id;
+
+        port += FLASHCOM_WATCHDOG_OFFSET;
+        if (!request_region(port, 1, "MixCOM watchdog")) {
+                return 0;
+        }
+
+        id=inb_p(port);
+        if(id!=FLASHCOM_ID) {
+                release_region(port, 1);
+                return 0;
+        }
+        return port;
+ }
+
+static int __init mixcomwd_init(void)
+{
+        int i;
+        int ret;
+        int found=0;
+
+        for (i = 0; !found && mixcomwd_ioports[i] != 0; i++) {
+                watchdog_port = mixcomwd_checkcard(mixcomwd_ioports[i]);
+                if (watchdog_port) {
+                        found = 1;
+                }
+        }
+
+        /* The FlashCOM card can be set up at 0x300 -> 0x378, in 0x8 jumps */
+        for (i = 0x300; !found && i < 0x380; i+=0x8) {
+                watchdog_port = flashcom_checkcard(i);
+                if (watchdog_port) {
+                        found = 1;
+                }
+        }
+
+        if (!found) {
+                printk("mixcomwd: No card detected, or port not available.\n");
+                return -ENODEV;
+        }
+
+        ret = misc_register(&mixcomwd_miscdev);
+        if (ret)
+        {
+                release_region(watchdog_port, 1);
+                return ret;
+        }
+
+        printk(KERN_INFO "MixCOM watchdog driver v%s, watchdog port at 0x%3x\n",VERSION,watchdog_port);
+
+        return 0;
+}
+
+static void __exit mixcomwd_exit(void)
+{
+        if (!nowayout) {
+                if(mixcomwd_timer_alive) {
+                        printk(KERN_WARNING "mixcomwd: I quit now, hardware will"
+                               " probably reboot!\n");
+                        del_timer(&mixcomwd_timer);
+                        mixcomwd_timer_alive=0;
+                }
+        }
+        release_region(watchdog_port,1);
+        misc_deregister(&mixcomwd_miscdev);
+}
+
+module_init(mixcomwd_init);
+module_exit(mixcomwd_exit);
+
+MODULE_AUTHOR("Gergely Madarasz <gorgo@itc.hu>");
+MODULE_DESCRIPTION("MixCom Watchdog driver");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);