1 files changed, 519 insertions, 0 deletions

diff --git a/drivers/watchdog/wdt977.c b/drivers/watchdog/wdt977.c
new file mode 100644
index 000000000000..7d300ff7ab07
--- /dev/null
+++ b/drivers/watchdog/wdt977.c
@@ -0,0 +1,519 @@
+/*
+ *      Wdt977  0.04:   A Watchdog Device for Netwinder W83977AF chip
+ *
+ *      (c) Copyright 1998 Rebel.com (Woody Suwalski <woody@netwinder.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.
+ *
+ *                      -----------------------
+ *      14-Dec-2001 Matt Domsch <Matt_Domsch@dell.com>
+ *           Added nowayout module option to override CONFIG_WATCHDOG_NOWAYOUT
+ *      19-Dec-2001 Woody Suwalski: Netwinder fixes, ioctl interface
+ *      06-Jan-2002 Woody Suwalski: For compatibility, convert all timeouts
+ *                                  from minutes to seconds.
+ *      07-Jul-2003 Daniele Bellucci: Audit return code of misc_register in
+ *                                    nwwatchdog_init.
+ *      25-Oct-2005 Woody Suwalski: Convert addresses to #defs, add spinlocks
+ *                                  remove limitiation to be used on Netwinders only
+ */
+
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/fs.h>
+#include <linux/miscdevice.h>
+#include <linux/init.h>
+#include <linux/ioport.h>
+#include <linux/watchdog.h>
+#include <linux/notifier.h>
+#include <linux/reboot.h>
+
+#include <asm/io.h>
+#include <asm/system.h>
+#include <asm/mach-types.h>
+#include <asm/uaccess.h>
+
+#define WATCHDOG_VERSION  "0.04"
+#define WATCHDOG_NAME     "Wdt977"
+#define PFX WATCHDOG_NAME ": "
+#define DRIVER_VERSION    WATCHDOG_NAME " driver, v" WATCHDOG_VERSION "\n"
+
+#define IO_INDEX_PORT   0x370           /* on some systems it can be 0x3F0 */
+#define IO_DATA_PORT    (IO_INDEX_PORT+1)
+
+#define UNLOCK_DATA     0x87
+#define LOCK_DATA       0xAA
+#define DEVICE_REGISTER 0x07
+
+
+#define DEFAULT_TIMEOUT 60                      /* default timeout in seconds */
+
+static  int timeout = DEFAULT_TIMEOUT;
+static  int timeoutM;                           /* timeout in minutes */
+static  unsigned long timer_alive;
+static  int testmode;
+static  char expect_close;
+static  spinlock_t spinlock;
+
+module_param(timeout, int, 0);
+MODULE_PARM_DESC(timeout,"Watchdog timeout in seconds (60..15300), default=" __MODULE_STRING(DEFAULT_TIMEOUT) ")");
+module_param(testmode, int, 0);
+MODULE_PARM_DESC(testmode,"Watchdog testmode (1 = no reboot), default=0");
+
+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) ")");
+
+/*
+ * Start the watchdog
+ */
+
+static int wdt977_start(void)
+{
+        unsigned long flags;
+
+        spin_lock_irqsave(&spinlock, flags);
+
+        /* unlock the SuperIO chip */
+        outb_p(UNLOCK_DATA, IO_INDEX_PORT);
+        outb_p(UNLOCK_DATA, IO_INDEX_PORT);
+
+        /* select device Aux2 (device=8) and set watchdog regs F2, F3 and F4
+         * F2 has the timeout in minutes
+         * F3 could be set to the POWER LED blink (with GP17 set to PowerLed)
+         *   at timeout, and to reset timer on kbd/mouse activity (not impl.)
+         * F4 is used to just clear the TIMEOUT'ed state (bit 0)
+         */
+        outb_p(DEVICE_REGISTER, IO_INDEX_PORT);
+        outb_p(0x08, IO_DATA_PORT);
+        outb_p(0xF2, IO_INDEX_PORT);
+        outb_p(timeoutM, IO_DATA_PORT);
+        outb_p(0xF3, IO_INDEX_PORT);
+        outb_p(0x00, IO_DATA_PORT);     /* another setting is 0E for kbd/mouse/LED */
+        outb_p(0xF4, IO_INDEX_PORT);
+        outb_p(0x00, IO_DATA_PORT);
+
+        /* at last select device Aux1 (dev=7) and set GP16 as a watchdog output */
+        /* in test mode watch the bit 1 on F4 to indicate "triggered" */
+        if (!testmode)
+        {
+                outb_p(DEVICE_REGISTER, IO_INDEX_PORT);
+                outb_p(0x07, IO_DATA_PORT);
+                outb_p(0xE6, IO_INDEX_PORT);
+                outb_p(0x08, IO_DATA_PORT);
+        }
+
+        /* lock the SuperIO chip */
+        outb_p(LOCK_DATA, IO_INDEX_PORT);
+
+        spin_unlock_irqrestore(&spinlock, flags);
+        printk(KERN_INFO PFX "activated.\n");
+
+        return 0;
+}
+
+/*
+ * Stop the watchdog
+ */
+
+static int wdt977_stop(void)
+{
+        unsigned long flags;
+        spin_lock_irqsave(&spinlock, flags);
+
+        /* unlock the SuperIO chip */
+        outb_p(UNLOCK_DATA, IO_INDEX_PORT);
+        outb_p(UNLOCK_DATA, IO_INDEX_PORT);
+
+        /* select device Aux2 (device=8) and set watchdog regs F2,F3 and F4
+        * F3 is reset to its default state
+        * F4 can clear the TIMEOUT'ed state (bit 0) - back to default
+        * We can not use GP17 as a PowerLed, as we use its usage as a RedLed
+        */
+        outb_p(DEVICE_REGISTER, IO_INDEX_PORT);
+        outb_p(0x08, IO_DATA_PORT);
+        outb_p(0xF2, IO_INDEX_PORT);
+        outb_p(0xFF, IO_DATA_PORT);
+        outb_p(0xF3, IO_INDEX_PORT);
+        outb_p(0x00, IO_DATA_PORT);
+        outb_p(0xF4, IO_INDEX_PORT);
+        outb_p(0x00, IO_DATA_PORT);
+        outb_p(0xF2, IO_INDEX_PORT);
+        outb_p(0x00, IO_DATA_PORT);
+
+        /* at last select device Aux1 (dev=7) and set GP16 as a watchdog output */
+        outb_p(DEVICE_REGISTER, IO_INDEX_PORT);
+        outb_p(0x07, IO_DATA_PORT);
+        outb_p(0xE6, IO_INDEX_PORT);
+        outb_p(0x08, IO_DATA_PORT);
+
+        /* lock the SuperIO chip */
+        outb_p(LOCK_DATA, IO_INDEX_PORT);
+
+        spin_unlock_irqrestore(&spinlock, flags);
+        printk(KERN_INFO PFX "shutdown.\n");
+
+        return 0;
+}
+
+/*
+ * Send a keepalive ping to the watchdog
+ * This is done by simply re-writing the timeout to reg. 0xF2
+ */
+
+static int wdt977_keepalive(void)
+{
+        unsigned long flags;
+        spin_lock_irqsave(&spinlock, flags);
+
+        /* unlock the SuperIO chip */
+        outb_p(UNLOCK_DATA, IO_INDEX_PORT);
+        outb_p(UNLOCK_DATA, IO_INDEX_PORT);
+
+        /* select device Aux2 (device=8) and kicks watchdog reg F2 */
+        /* F2 has the timeout in minutes */
+        outb_p(DEVICE_REGISTER, IO_INDEX_PORT);
+        outb_p(0x08, IO_DATA_PORT);
+        outb_p(0xF2, IO_INDEX_PORT);
+        outb_p(timeoutM, IO_DATA_PORT);
+
+        /* lock the SuperIO chip */
+        outb_p(LOCK_DATA, IO_INDEX_PORT);
+        spin_unlock_irqrestore(&spinlock, flags);
+
+        return 0;
+}
+
+/*
+ * Set the watchdog timeout value
+ */
+
+static int wdt977_set_timeout(int t)
+{
+        int tmrval;
+
+        /* convert seconds to minutes, rounding up */
+        tmrval = (t + 59) / 60;
+
+        if (machine_is_netwinder()) {
+                /* we have a hw bug somewhere, so each 977 minute is actually only 30sec
+                 *  this limits the max timeout to half of device max of 255 minutes...
+                 */
+                tmrval += tmrval;
+        }
+
+        if ((tmrval < 1) || (tmrval > 255))
+                return -EINVAL;
+
+        /* timeout is the timeout in seconds, timeoutM is the timeout in minutes) */
+        timeout = t;
+        timeoutM = tmrval;
+        return 0;
+}
+
+/*
+ * Get the watchdog status
+ */
+
+static int wdt977_get_status(int *status)
+{
+        int new_status;
+        unsigned long flags;
+
+        spin_lock_irqsave(&spinlock, flags);
+
+        /* unlock the SuperIO chip */
+        outb_p(UNLOCK_DATA, IO_INDEX_PORT);
+        outb_p(UNLOCK_DATA, IO_INDEX_PORT);
+
+        /* select device Aux2 (device=8) and read watchdog reg F4 */
+        outb_p(DEVICE_REGISTER, IO_INDEX_PORT);
+        outb_p(0x08, IO_DATA_PORT);
+        outb_p(0xF4, IO_INDEX_PORT);
+        new_status = inb_p(IO_DATA_PORT);
+
+        /* lock the SuperIO chip */
+        outb_p(LOCK_DATA, IO_INDEX_PORT);
+
+        spin_unlock_irqrestore(&spinlock, flags);
+
+        *status=0;
+        if (new_status & 1)
+                *status |= WDIOF_CARDRESET;
+
+        return 0;
+}
+
+
+/*
+ *      /dev/watchdog handling
+ */
+
+static int wdt977_open(struct inode *inode, struct file *file)
+{
+        /* If the watchdog is alive we don't need to start it again */
+        if( test_and_set_bit(0,&timer_alive) )
+                return -EBUSY;
+
+        if (nowayout)
+                __module_get(THIS_MODULE);
+
+        wdt977_start();
+        return nonseekable_open(inode, file);
+}
+
+static int wdt977_release(struct inode *inode, struct file *file)
+{
+        /*
+         *      Shut off the timer.
+         *      Lock it in if it's a module and we set nowayout
+         */
+        if (expect_close == 42)
+        {
+                wdt977_stop();
+                clear_bit(0,&timer_alive);
+        } else {
+                wdt977_keepalive();
+                printk(KERN_CRIT PFX "Unexpected close, not stopping watchdog!\n");
+        }
+        expect_close = 0;
+        return 0;
+}
+
+
+/*
+ *      wdt977_write:
+ *      @file: file handle to the watchdog
+ *      @buf: buffer to write (unused as data does not matter here
+ *      @count: count of bytes
+ *      @ppos: pointer to the position to write. No seeks allowed
+ *
+ *      A write to a watchdog device is defined as a keepalive signal. Any
+ *      write of data will do, as we we don't define content meaning.
+ */
+
+static ssize_t wdt977_write(struct file *file, const char __user *buf,
+                            size_t count, loff_t *ppos)
+{
+        if (count)
+        {
+                if (!nowayout)
+                {
+                        size_t i;
+
+                        /* In case it was set long ago */
+                        expect_close = 0;
+
+                        for (i = 0; i != count; i++)
+                        {
+                                char c;
+                                if (get_user(c, buf + i))
+                                        return -EFAULT;
+                                if (c == 'V')
+                                        expect_close = 42;
+                        }
+                }
+
+                /* someone wrote to us, we should restart timer */
+                wdt977_keepalive();
+        }
+        return count;
+}
+
+/*
+ *      wdt977_ioctl:
+ *      @inode: inode of the device
+ *      @file: file handle to the device
+ *      @cmd: watchdog command
+ *      @arg: argument pointer
+ *
+ *      The watchdog API defines a common set of functions for all watchdogs
+ *      according to their available features.
+ */
+
+static struct watchdog_info ident = {
+        .options =              WDIOF_SETTIMEOUT |
+                                WDIOF_MAGICCLOSE |
+                                WDIOF_KEEPALIVEPING,
+        .firmware_version =     1,
+        .identity =             WATCHDOG_NAME,
+};
+
+static int wdt977_ioctl(struct inode *inode, struct file *file,
+        unsigned int cmd, unsigned long arg)
+{
+        int status;
+        int new_options, retval = -EINVAL;
+        int new_timeout;
+        union {
+                struct watchdog_info __user *ident;
+                int __user *i;
+        } uarg;
+
+        uarg.i = (int __user *)arg;
+
+        switch(cmd)
+        {
+        default:
+                return -ENOTTY;
+
+        case WDIOC_GETSUPPORT:
+                return copy_to_user(uarg.ident, &ident,
+                        sizeof(ident)) ? -EFAULT : 0;
+
+        case WDIOC_GETSTATUS:
+                wdt977_get_status(&status);
+                return put_user(status, uarg.i);
+
+        case WDIOC_GETBOOTSTATUS:
+                return put_user(0, uarg.i);
+
+        case WDIOC_KEEPALIVE:
+                wdt977_keepalive();
+                return 0;
+
+        case WDIOC_SETOPTIONS:
+                if (get_user (new_options, uarg.i))
+                        return -EFAULT;
+
+                if (new_options & WDIOS_DISABLECARD) {
+                        wdt977_stop();
+                        retval = 0;
+                }
+
+                if (new_options & WDIOS_ENABLECARD) {
+                        wdt977_start();
+                        retval = 0;
+                }
+
+                return retval;
+
+        case WDIOC_SETTIMEOUT:
+                if (get_user(new_timeout, uarg.i))
+                        return -EFAULT;
+
+                if (wdt977_set_timeout(new_timeout))
+                    return -EINVAL;
+
+                wdt977_keepalive();
+                /* Fall */
+
+        case WDIOC_GETTIMEOUT:
+                return put_user(timeout, uarg.i);
+
+        }
+}
+
+static int wdt977_notify_sys(struct notifier_block *this, unsigned long code,
+        void *unused)
+{
+        if(code==SYS_DOWN || code==SYS_HALT)
+                wdt977_stop();
+        return NOTIFY_DONE;
+}
+
+static const struct file_operations wdt977_fops=
+{
+        .owner          = THIS_MODULE,
+        .llseek         = no_llseek,
+        .write          = wdt977_write,
+        .ioctl          = wdt977_ioctl,
+        .open           = wdt977_open,
+        .release        = wdt977_release,
+};
+
+static struct miscdevice wdt977_miscdev=
+{
+        .minor          = WATCHDOG_MINOR,
+        .name           = "watchdog",
+        .fops           = &wdt977_fops,
+};
+
+static struct notifier_block wdt977_notifier = {
+        .notifier_call = wdt977_notify_sys,
+};
+
+static int __init wd977_init(void)
+{
+        int rc;
+
+        //if (!machine_is_netwinder())
+        //      return -ENODEV;
+
+        printk(KERN_INFO PFX DRIVER_VERSION);
+
+        spin_lock_init(&spinlock);
+
+        /* Check that the timeout value is within it's range ; if not reset to the default */
+        if (wdt977_set_timeout(timeout))
+        {
+                wdt977_set_timeout(DEFAULT_TIMEOUT);
+                printk(KERN_INFO PFX "timeout value must be 60<timeout<15300, using %d\n",
+                        DEFAULT_TIMEOUT);
+        }
+
+        /* on Netwinder the IOports are already reserved by
+         * arch/arm/mach-footbridge/netwinder-hw.c
+         */
+        if (!machine_is_netwinder())
+        {
+                if (!request_region(IO_INDEX_PORT, 2, WATCHDOG_NAME))
+                {
+                        printk(KERN_ERR PFX "I/O address 0x%04x already in use\n",
+                                IO_INDEX_PORT);
+                        rc = -EIO;
+                        goto err_out;
+                }
+        }
+
+        rc = misc_register(&wdt977_miscdev);
+        if (rc)
+        {
+                printk(KERN_ERR PFX "cannot register miscdev on minor=%d (err=%d)\n",
+                        wdt977_miscdev.minor, rc);
+                goto err_out_region;
+        }
+
+        rc = register_reboot_notifier(&wdt977_notifier);
+        if (rc)
+        {
+                printk(KERN_ERR PFX "cannot register reboot notifier (err=%d)\n",
+                        rc);
+                goto err_out_miscdev;
+        }
+
+        printk(KERN_INFO PFX "initialized. timeout=%d sec (nowayout=%d, testmode=%i)\n",
+                timeout, nowayout, testmode);
+
+        return 0;
+
+err_out_miscdev:
+        misc_deregister(&wdt977_miscdev);
+err_out_region:
+        if (!machine_is_netwinder())
+                release_region(IO_INDEX_PORT,2);
+err_out:
+        return rc;
+}
+
+static void __exit wd977_exit(void)
+{
+        wdt977_stop();
+        misc_deregister(&wdt977_miscdev);
+        unregister_reboot_notifier(&wdt977_notifier);
+        release_region(IO_INDEX_PORT,2);
+}
+
+module_init(wd977_init);
+module_exit(wd977_exit);
+
+MODULE_AUTHOR("Woody Suwalski <woodys@xandros.com>");
+MODULE_DESCRIPTION("W83977AF Watchdog driver");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);