1 files changed, 362 insertions, 0 deletions

diff --git a/drivers/watchdog/advantechwdt.c b/drivers/watchdog/advantechwdt.c
new file mode 100644
index 000000000000..8121cc247343
--- /dev/null
+++ b/drivers/watchdog/advantechwdt.c
@@ -0,0 +1,362 @@
+/*
+ *      Advantech Single Board Computer WDT driver
+ *
+ *      (c) Copyright 2000-2001 Marek Michalkiewicz <marekm@linux.org.pl>
+ *
+ *      Based on acquirewdt.c which is based on wdt.c.
+ *      Original copyright messages:
+ *
+ *      (c) Copyright 1996 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@redhat.com>
+ *
+ *      14-Dec-2001 Matt Domsch <Matt_Domsch@dell.com>
+ *          Added nowayout module option to override CONFIG_WATCHDOG_NOWAYOUT
+ *
+ *      16-Oct-2002 Rob Radez <rob@osinvestor.com>
+ *          Clean up ioctls, clean up init + exit, add expect close support,
+ *          add wdt_start and wdt_stop as parameters.
+ */
+
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/types.h>
+#include <linux/miscdevice.h>
+#include <linux/watchdog.h>
+#include <linux/fs.h>
+#include <linux/ioport.h>
+#include <linux/platform_device.h>
+#include <linux/init.h>
+
+#include <asm/io.h>
+#include <asm/uaccess.h>
+#include <asm/system.h>
+
+#define DRV_NAME "advantechwdt"
+#define PFX DRV_NAME ": "
+#define WATCHDOG_NAME "Advantech WDT"
+#define WATCHDOG_TIMEOUT 60             /* 60 sec default timeout */
+
+static struct platform_device *advwdt_platform_device;  /* the watchdog platform device */
+static unsigned long advwdt_is_open;
+static char adv_expect_close;
+
+/*
+ *      You must set these - there is no sane way to probe for this board.
+ *
+ *      To enable or restart, write the timeout value in seconds (1 to 63)
+ *      to I/O port wdt_start.  To disable, read I/O port wdt_stop.
+ *      Both are 0x443 for most boards (tested on a PCA-6276VE-00B1), but
+ *      check your manual (at least the PCA-6159 seems to be different -
+ *      the manual says wdt_stop is 0x43, not 0x443).
+ *      (0x43 is also a write-only control register for the 8254 timer!)
+ */
+
+static int wdt_stop = 0x443;
+module_param(wdt_stop, int, 0);
+MODULE_PARM_DESC(wdt_stop, "Advantech WDT 'stop' io port (default 0x443)");
+
+static int wdt_start = 0x443;
+module_param(wdt_start, int, 0);
+MODULE_PARM_DESC(wdt_start, "Advantech WDT 'start' io port (default 0x443)");
+
+static int timeout = WATCHDOG_TIMEOUT;  /* in seconds */
+module_param(timeout, int, 0);
+MODULE_PARM_DESC(timeout, "Watchdog timeout in seconds. 1<= timeout <=63, default=" __MODULE_STRING(WATCHDOG_TIMEOUT) ".");
+
+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) ")");
+
+/*
+ *      Watchdog Operations
+ */
+
+static void
+advwdt_ping(void)
+{
+        /* Write a watchdog value */
+        outb_p(timeout, wdt_start);
+}
+
+static void
+advwdt_disable(void)
+{
+        inb_p(wdt_stop);
+}
+
+static int
+advwdt_set_heartbeat(int t)
+{
+        if ((t < 1) || (t > 63))
+                return -EINVAL;
+
+        timeout = t;
+        return 0;
+}
+
+/*
+ *      /dev/watchdog handling
+ */
+
+static ssize_t
+advwdt_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos)
+{
+        if (count) {
+                if (!nowayout) {
+                        size_t i;
+
+                        adv_expect_close = 0;
+
+                        for (i = 0; i != count; i++) {
+                                char c;
+                                if (get_user(c, buf+i))
+                                        return -EFAULT;
+                                if (c == 'V')
+                                        adv_expect_close = 42;
+                        }
+                }
+                advwdt_ping();
+        }
+        return count;
+}
+
+static int
+advwdt_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 = WATCHDOG_NAME,
+        };
+
+        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:
+          advwdt_ping();
+          break;
+
+        case WDIOC_SETTIMEOUT:
+          if (get_user(new_timeout, p))
+                  return -EFAULT;
+          if (advwdt_set_heartbeat(new_timeout))
+                  return -EINVAL;
+          advwdt_ping();
+          /* 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) {
+            advwdt_disable();
+            retval = 0;
+          }
+
+          if (options & WDIOS_ENABLECARD) {
+            advwdt_ping();
+            retval = 0;
+          }
+
+          return retval;
+        }
+
+        default:
+          return -ENOTTY;
+        }
+        return 0;
+}
+
+static int
+advwdt_open(struct inode *inode, struct file *file)
+{
+        if (test_and_set_bit(0, &advwdt_is_open))
+                return -EBUSY;
+        /*
+         *      Activate
+         */
+
+        advwdt_ping();
+        return nonseekable_open(inode, file);
+}
+
+static int
+advwdt_close(struct inode *inode, struct file *file)
+{
+        if (adv_expect_close == 42) {
+                advwdt_disable();
+        } else {
+                printk(KERN_CRIT PFX "Unexpected close, not stopping watchdog!\n");
+                advwdt_ping();
+        }
+        clear_bit(0, &advwdt_is_open);
+        adv_expect_close = 0;
+        return 0;
+}
+
+/*
+ *      Kernel Interfaces
+ */
+
+static const struct file_operations advwdt_fops = {
+        .owner          = THIS_MODULE,
+        .llseek         = no_llseek,
+        .write          = advwdt_write,
+        .ioctl          = advwdt_ioctl,
+        .open           = advwdt_open,
+        .release        = advwdt_close,
+};
+
+static struct miscdevice advwdt_miscdev = {
+        .minor  = WATCHDOG_MINOR,
+        .name   = "watchdog",
+        .fops   = &advwdt_fops,
+};
+
+/*
+ *      Init & exit routines
+ */
+
+static int __devinit
+advwdt_probe(struct platform_device *dev)
+{
+        int ret;
+
+        if (wdt_stop != wdt_start) {
+                if (!request_region(wdt_stop, 1, WATCHDOG_NAME)) {
+                        printk (KERN_ERR PFX "I/O address 0x%04x already in use\n",
+                                wdt_stop);
+                        ret = -EIO;
+                        goto out;
+                }
+        }
+
+        if (!request_region(wdt_start, 1, WATCHDOG_NAME)) {
+                printk (KERN_ERR PFX "I/O address 0x%04x already in use\n",
+                        wdt_start);
+                ret = -EIO;
+                goto unreg_stop;
+        }
+
+        /* Check that the heartbeat value is within it's range ; if not reset to the default */
+        if (advwdt_set_heartbeat(timeout)) {
+                advwdt_set_heartbeat(WATCHDOG_TIMEOUT);
+                printk (KERN_INFO PFX "timeout value must be 1<=x<=63, using %d\n",
+                        timeout);
+        }
+
+        ret = misc_register(&advwdt_miscdev);
+        if (ret != 0) {
+                printk (KERN_ERR PFX "cannot register miscdev on minor=%d (err=%d)\n",
+                        WATCHDOG_MINOR, ret);
+                goto unreg_regions;
+        }
+
+        printk (KERN_INFO PFX "initialized. timeout=%d sec (nowayout=%d)\n",
+                timeout, nowayout);
+
+out:
+        return ret;
+unreg_regions:
+        release_region(wdt_start, 1);
+unreg_stop:
+        if (wdt_stop != wdt_start)
+                release_region(wdt_stop, 1);
+        goto out;
+}
+
+static int __devexit
+advwdt_remove(struct platform_device *dev)
+{
+        misc_deregister(&advwdt_miscdev);
+        release_region(wdt_start,1);
+        if(wdt_stop != wdt_start)
+                release_region(wdt_stop,1);
+
+        return 0;
+}
+
+static void
+advwdt_shutdown(struct platform_device *dev)
+{
+        /* Turn the WDT off if we have a soft shutdown */
+        advwdt_disable();
+}
+
+static struct platform_driver advwdt_driver = {
+        .probe          = advwdt_probe,
+        .remove         = __devexit_p(advwdt_remove),
+        .shutdown       = advwdt_shutdown,
+        .driver         = {
+                .owner  = THIS_MODULE,
+                .name   = DRV_NAME,
+        },
+};
+
+static int __init
+advwdt_init(void)
+{
+        int err;
+
+        printk(KERN_INFO "WDT driver for Advantech single board computer initialising.\n");
+
+        err = platform_driver_register(&advwdt_driver);
+        if (err)
+                return err;
+
+        advwdt_platform_device = platform_device_register_simple(DRV_NAME, -1, NULL, 0);
+        if (IS_ERR(advwdt_platform_device)) {
+                err = PTR_ERR(advwdt_platform_device);
+                goto unreg_platform_driver;
+        }
+
+        return 0;
+
+unreg_platform_driver:
+        platform_driver_unregister(&advwdt_driver);
+        return err;
+}
+
+static void __exit
+advwdt_exit(void)
+{
+        platform_device_unregister(advwdt_platform_device);
+        platform_driver_unregister(&advwdt_driver);
+        printk(KERN_INFO PFX "Watchdog Module Unloaded.\n");
+}
+
+module_init(advwdt_init);
+module_exit(advwdt_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Marek Michalkiewicz <marekm@linux.org.pl>");
+MODULE_DESCRIPTION("Advantech Single Board Computer WDT driver");
+MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);