1 files changed, 535 insertions, 0 deletions

diff --git a/drivers/char/watchdog/i8xx_tco.c b/drivers/char/watchdog/i8xx_tco.c
new file mode 100644
index 000000000000..c337978dc966
--- /dev/null
+++ b/drivers/char/watchdog/i8xx_tco.c
@@ -0,0 +1,535 @@
+/*
+ *      i8xx_tco 0.07:  TCO timer driver for i8xx chipsets
+ *
+ *      (c) Copyright 2000 kernel concepts <nils@kernelconcepts.de>, All Rights Reserved.
+ *                              http://www.kernelconcepts.de
+ *
+ *      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 kernel concepts nor Nils Faerber admit liability nor provide
+ *      warranty for any of this software. This material is provided
+ *      "AS-IS" and at no charge.
+ *
+ *      (c) Copyright 2000      kernel concepts <nils@kernelconcepts.de>
+ *                              developed for
+ *                              Jentro AG, Haar/Munich (Germany)
+ *
+ *      TCO timer driver for i8xx chipsets
+ *      based on softdog.c by Alan Cox <alan@redhat.com>
+ *
+ *      The TCO timer is implemented in the following I/O controller hubs:
+ *      (See the intel documentation on http://developer.intel.com.)
+ *      82801AA  (ICH)    : document number 290655-003, 290677-014,
+ *      82801AB  (ICHO)   : document number 290655-003, 290677-014,
+ *      82801BA  (ICH2)   : document number 290687-002, 298242-027,
+ *      82801BAM (ICH2-M) : document number 290687-002, 298242-027,
+ *      82801CA  (ICH3-S) : document number 290733-003, 290739-013,
+ *      82801CAM (ICH3-M) : document number 290716-001, 290718-007,
+ *      82801DB  (ICH4)   : document number 290744-001, 290745-020,
+ *      82801DBM (ICH4-M) : document number 252337-001, 252663-005,
+ *      82801E   (C-ICH)  : document number 273599-001, 273645-002,
+ *      82801EB  (ICH5)   : document number 252516-001, 252517-003,
+ *      82801ER  (ICH5R)  : document number 252516-001, 252517-003,
+ *      82801FB  (ICH6)   : document number 301473-002, 301474-007,
+ *      82801FR  (ICH6R)  : document number 301473-002, 301474-007,
+ *      82801FBM (ICH6-M) : document number 301473-002, 301474-007,
+ *      82801FW  (ICH6W)  : document number 301473-001, 301474-007,
+ *      82801FRW (ICH6RW) : document number 301473-001, 301474-007
+ *
+ *  20000710 Nils Faerber
+ *      Initial Version 0.01
+ *  20000728 Nils Faerber
+ *      0.02 Fix for SMI_EN->TCO_EN bit, some cleanups
+ *  20011214 Matt Domsch <Matt_Domsch@dell.com>
+ *      0.03 Added nowayout module option to override CONFIG_WATCHDOG_NOWAYOUT
+ *           Didn't add timeout option as i810_margin already exists.
+ *  20020224 Joel Becker, Wim Van Sebroeck
+ *      0.04 Support for 82801CA(M) chipset, timer margin needs to be > 3,
+ *           add support for WDIOC_SETTIMEOUT and WDIOC_GETTIMEOUT.
+ *  20020412 Rob Radez <rob@osinvestor.com>, Wim Van Sebroeck
+ *      0.05 Fix possible timer_alive race, add expect close support,
+ *           clean up ioctls (WDIOC_GETSTATUS, WDIOC_GETBOOTSTATUS and
+ *           WDIOC_SETOPTIONS), made i810tco_getdevice __init,
+ *           removed boot_status, removed tco_timer_read,
+ *           added support for 82801DB and 82801E chipset,
+ *           added support for 82801EB and 8280ER chipset,
+ *           general cleanup.
+ *  20030921 Wim Van Sebroeck <wim@iguana.be>
+ *      0.06 change i810_margin to heartbeat, use module_param,
+ *           added notify system support, renamed module to i8xx_tco.
+ *  20050128 Wim Van Sebroeck <wim@iguana.be>
+ *      0.07 Added support for the ICH4-M, ICH6, ICH6R, ICH6-M, ICH6W and ICH6RW
+ *           chipsets. Also added support for the "undocumented" ICH7 chipset.
+ */
+
+/*
+ *      Includes, defines, variables, module parameters, ...
+ */
+
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/types.h>
+#include <linux/miscdevice.h>
+#include <linux/watchdog.h>
+#include <linux/notifier.h>
+#include <linux/reboot.h>
+#include <linux/init.h>
+#include <linux/fs.h>
+#include <linux/pci.h>
+#include <linux/ioport.h>
+
+#include <asm/uaccess.h>
+#include <asm/io.h>
+
+#include "i8xx_tco.h"
+
+/* Module and version information */
+#define TCO_VERSION "0.07"
+#define TCO_MODULE_NAME "i8xx TCO timer"
+#define TCO_DRIVER_NAME   TCO_MODULE_NAME ", v" TCO_VERSION
+#define PFX TCO_MODULE_NAME ": "
+
+/* internal variables */
+static unsigned int ACPIBASE;
+static spinlock_t tco_lock;     /* Guards the hardware */
+static unsigned long timer_alive;
+static char tco_expect_close;
+static struct pci_dev *i8xx_tco_pci;
+
+/* module parameters */
+#define WATCHDOG_HEARTBEAT 30   /* 30 sec default heartbeat (2<heartbeat<39) */
+static int heartbeat = WATCHDOG_HEARTBEAT;  /* in seconds */
+module_param(heartbeat, int, 0);
+MODULE_PARM_DESC(heartbeat, "Watchdog heartbeat in seconds. (2<heartbeat<39, default=" __MODULE_STRING(WATCHDOG_HEARTBEAT) ")");
+
+#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)");
+
+/*
+ * Some TCO specific functions
+ */
+
+static inline unsigned char seconds_to_ticks(int seconds)
+{
+        /* the internal timer is stored as ticks which decrement
+         * every 0.6 seconds */
+        return (seconds * 10) / 6;
+}
+
+static int tco_timer_start (void)
+{
+        unsigned char val;
+
+        spin_lock(&tco_lock);
+        val = inb (TCO1_CNT + 1);
+        val &= 0xf7;
+        outb (val, TCO1_CNT + 1);
+        val = inb (TCO1_CNT + 1);
+        spin_unlock(&tco_lock);
+
+        if (val & 0x08)
+                return -1;
+        return 0;
+}
+
+static int tco_timer_stop (void)
+{
+        unsigned char val;
+
+        spin_lock(&tco_lock);
+        val = inb (TCO1_CNT + 1);
+        val |= 0x08;
+        outb (val, TCO1_CNT + 1);
+        val = inb (TCO1_CNT + 1);
+        spin_unlock(&tco_lock);
+
+        if ((val & 0x08) == 0)
+                return -1;
+        return 0;
+}
+
+static int tco_timer_keepalive (void)
+{
+        spin_lock(&tco_lock);
+        outb (0x01, TCO1_RLD);
+        spin_unlock(&tco_lock);
+        return 0;
+}
+
+static int tco_timer_set_heartbeat (int t)
+{
+        unsigned char val;
+        unsigned char tmrval;
+
+        tmrval = seconds_to_ticks(t);
+        /* from the specs: */
+        /* "Values of 0h-3h are ignored and should not be attempted" */
+        if (tmrval > 0x3f || tmrval < 0x04)
+                return -EINVAL;
+
+        /* Write new heartbeat to watchdog */
+        spin_lock(&tco_lock);
+        val = inb (TCO1_TMR);
+        val &= 0xc0;
+        val |= tmrval;
+        outb (val, TCO1_TMR);
+        val = inb (TCO1_TMR);
+        spin_unlock(&tco_lock);
+
+        if ((val & 0x3f) != tmrval)
+                return -EINVAL;
+
+        heartbeat = t;
+        return 0;
+}
+
+/*
+ *      /dev/watchdog handling
+ */
+
+static int i8xx_tco_open (struct inode *inode, struct file *file)
+{
+        /* /dev/watchdog can only be opened once */
+        if (test_and_set_bit(0, &timer_alive))
+                return -EBUSY;
+
+        /*
+         *      Reload and activate timer
+         */
+        tco_timer_keepalive ();
+        tco_timer_start ();
+        return nonseekable_open(inode, file);
+}
+
+static int i8xx_tco_release (struct inode *inode, struct file *file)
+{
+        /*
+         *      Shut off the timer.
+         */
+        if (tco_expect_close == 42) {
+                tco_timer_stop ();
+        } else {
+                printk(KERN_CRIT PFX "Unexpected close, not stopping watchdog!\n");
+                tco_timer_keepalive ();
+        }
+        clear_bit(0, &timer_alive);
+        tco_expect_close = 0;
+        return 0;
+}
+
+static ssize_t i8xx_tco_write (struct file *file, const char __user *data,
+                              size_t len, loff_t * ppos)
+{
+        /* See if we got the magic character 'V' and reload the timer */
+        if (len) {
+                if (!nowayout) {
+                        size_t i;
+
+                        /* note: just in case someone wrote the magic character
+                         * five months ago... */
+                        tco_expect_close = 0;
+
+                        /* scan to see whether or not we got the magic character */
+                        for (i = 0; i != len; i++) {
+                                char c;
+                                if(get_user(c, data+i))
+                                        return -EFAULT;
+                                if (c == 'V')
+                                        tco_expect_close = 42;
+                        }
+                }
+
+                /* someone wrote to us, we should reload the timer */
+                tco_timer_keepalive ();
+        }
+        return len;
+}
+
+static int i8xx_tco_ioctl (struct inode *inode, struct file *file,
+                          unsigned int cmd, unsigned long arg)
+{
+        int new_options, retval = -EINVAL;
+        int new_heartbeat;
+        void __user *argp = (void __user *)arg;
+        int __user *p = argp;
+        static struct watchdog_info ident = {
+                .options =              WDIOF_SETTIMEOUT |
+                                        WDIOF_KEEPALIVEPING |
+                                        WDIOF_MAGICCLOSE,
+                .firmware_version =     0,
+                .identity =             TCO_MODULE_NAME,
+        };
+
+        switch (cmd) {
+                case WDIOC_GETSUPPORT:
+                        return copy_to_user(argp, &ident,
+                                sizeof (ident)) ? -EFAULT : 0;
+
+                case WDIOC_GETSTATUS:
+                case WDIOC_GETBOOTSTATUS:
+                        return put_user (0, p);
+
+                case WDIOC_KEEPALIVE:
+                        tco_timer_keepalive ();
+                        return 0;
+
+                case WDIOC_SETOPTIONS:
+                {
+                        if (get_user (new_options, p))
+                                return -EFAULT;
+
+                        if (new_options & WDIOS_DISABLECARD) {
+                                tco_timer_stop ();
+                                retval = 0;
+                        }
+
+                        if (new_options & WDIOS_ENABLECARD) {
+                                tco_timer_keepalive ();
+                                tco_timer_start ();
+                                retval = 0;
+                        }
+
+                        return retval;
+                }
+
+                case WDIOC_SETTIMEOUT:
+                {
+                        if (get_user(new_heartbeat, p))
+                                return -EFAULT;
+
+                        if (tco_timer_set_heartbeat(new_heartbeat))
+                            return -EINVAL;
+
+                        tco_timer_keepalive ();
+                        /* Fall */
+                }
+
+                case WDIOC_GETTIMEOUT:
+                        return put_user(heartbeat, p);
+
+                default:
+                        return -ENOIOCTLCMD;
+        }
+}
+
+/*
+ *      Notify system
+ */
+
+static int i8xx_tco_notify_sys (struct notifier_block *this, unsigned long code, void *unused)
+{
+        if (code==SYS_DOWN || code==SYS_HALT) {
+                /* Turn the WDT off */
+                tco_timer_stop ();
+        }
+
+        return NOTIFY_DONE;
+}
+
+/*
+ *      Kernel Interfaces
+ */
+
+static struct file_operations i8xx_tco_fops = {
+        .owner =        THIS_MODULE,
+        .llseek =       no_llseek,
+        .write =        i8xx_tco_write,
+        .ioctl =        i8xx_tco_ioctl,
+        .open =         i8xx_tco_open,
+        .release =      i8xx_tco_release,
+};
+
+static struct miscdevice i8xx_tco_miscdev = {
+        .minor =        WATCHDOG_MINOR,
+        .name =         "watchdog",
+        .fops =         &i8xx_tco_fops,
+};
+
+static struct notifier_block i8xx_tco_notifier = {
+        .notifier_call =        i8xx_tco_notify_sys,
+};
+
+/*
+ * Data for PCI driver interface
+ *
+ * This data only exists for exporting the supported
+ * PCI ids via MODULE_DEVICE_TABLE.  We do not actually
+ * register a pci_driver, because someone else might one day
+ * want to register another driver on the same PCI id.
+ */
+static struct pci_device_id i8xx_tco_pci_tbl[] = {
+        { PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801AA_0,   PCI_ANY_ID, PCI_ANY_ID, },
+        { PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801AB_0,   PCI_ANY_ID, PCI_ANY_ID, },
+        { PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801BA_0,   PCI_ANY_ID, PCI_ANY_ID, },
+        { PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801BA_10,  PCI_ANY_ID, PCI_ANY_ID, },
+        { PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801CA_0,   PCI_ANY_ID, PCI_ANY_ID, },
+        { PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801CA_12,  PCI_ANY_ID, PCI_ANY_ID, },
+        { PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801DB_0,   PCI_ANY_ID, PCI_ANY_ID, },
+        { PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801DB_12,  PCI_ANY_ID, PCI_ANY_ID, },
+        { PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801E_0,    PCI_ANY_ID, PCI_ANY_ID, },
+        { PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801EB_0,   PCI_ANY_ID, PCI_ANY_ID, },
+        { PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ICH6_0,      PCI_ANY_ID, PCI_ANY_ID, },
+        { PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ICH6_1,      PCI_ANY_ID, PCI_ANY_ID, },
+        { PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ICH6_2,      PCI_ANY_ID, PCI_ANY_ID, },
+        { PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ICH7_0,      PCI_ANY_ID, PCI_ANY_ID, },
+        { PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ICH7_1,      PCI_ANY_ID, PCI_ANY_ID, },
+        { 0, },                 /* End of list */
+};
+MODULE_DEVICE_TABLE (pci, i8xx_tco_pci_tbl);
+
+/*
+ *      Init & exit routines
+ */
+
+static unsigned char __init i8xx_tco_getdevice (void)
+{
+        struct pci_dev *dev = NULL;
+        u8 val1, val2;
+        u16 badr;
+        /*
+         *      Find the PCI device
+         */
+
+        while ((dev = pci_find_device(PCI_ANY_ID, PCI_ANY_ID, dev)) != NULL) {
+                if (pci_match_device(i8xx_tco_pci_tbl, dev)) {
+                        i8xx_tco_pci = dev;
+                        break;
+                }
+        }
+
+        if (i8xx_tco_pci) {
+                /*
+                 *      Find the ACPI base I/O address which is the base
+                 *      for the TCO registers (TCOBASE=ACPIBASE + 0x60)
+                 *      ACPIBASE is bits [15:7] from 0x40-0x43
+                 */
+                pci_read_config_byte (i8xx_tco_pci, 0x40, &val1);
+                pci_read_config_byte (i8xx_tco_pci, 0x41, &val2);
+                badr = ((val2 << 1) | (val1 >> 7)) << 7;
+                ACPIBASE = badr;
+                /* Something's wrong here, ACPIBASE has to be set */
+                if (badr == 0x0001 || badr == 0x0000) {
+                        printk (KERN_ERR PFX "failed to get TCOBASE address\n");
+                        return 0;
+                }
+                /*
+                 * Check chipset's NO_REBOOT bit
+                 */
+                pci_read_config_byte (i8xx_tco_pci, 0xd4, &val1);
+                if (val1 & 0x02) {
+                        val1 &= 0xfd;
+                        pci_write_config_byte (i8xx_tco_pci, 0xd4, val1);
+                        pci_read_config_byte (i8xx_tco_pci, 0xd4, &val1);
+                        if (val1 & 0x02) {
+                                printk (KERN_ERR PFX "failed to reset NO_REBOOT flag, reboot disabled by hardware\n");
+                                return 0;       /* Cannot reset NO_REBOOT bit */
+                        }
+                }
+                /* Set the TCO_EN bit in SMI_EN register */
+                if (!request_region (SMI_EN + 1, 1, "i8xx TCO")) {
+                        printk (KERN_ERR PFX "I/O address 0x%04x already in use\n",
+                                SMI_EN + 1);
+                        return 0;
+                }
+                val1 = inb (SMI_EN + 1);
+                val1 &= 0xdf;
+                outb (val1, SMI_EN + 1);
+                release_region (SMI_EN + 1, 1);
+                return 1;
+        }
+        return 0;
+}
+
+static int __init watchdog_init (void)
+{
+        int ret;
+
+        spin_lock_init(&tco_lock);
+
+        /* Check whether or not the hardware watchdog is there */
+        if (!i8xx_tco_getdevice () || i8xx_tco_pci == NULL)
+                return -ENODEV;
+
+        if (!request_region (TCOBASE, 0x10, "i8xx TCO")) {
+                printk (KERN_ERR PFX "I/O address 0x%04x already in use\n",
+                        TCOBASE);
+                ret = -EIO;
+                goto out;
+        }
+
+        /* Clear out the (probably old) status */
+        outb (0, TCO1_STS);
+        outb (3, TCO2_STS);
+
+        /* Check that the heartbeat value is within it's range ; if not reset to the default */
+        if (tco_timer_set_heartbeat (heartbeat)) {
+                heartbeat = WATCHDOG_HEARTBEAT;
+                tco_timer_set_heartbeat (heartbeat);
+                printk(KERN_INFO PFX "heartbeat value must be 2<heartbeat<39, using %d\n",
+                        heartbeat);
+        }
+
+        ret = register_reboot_notifier(&i8xx_tco_notifier);
+        if (ret != 0) {
+                printk(KERN_ERR PFX "cannot register reboot notifier (err=%d)\n",
+                        ret);
+                goto unreg_region;
+        }
+
+        ret = misc_register(&i8xx_tco_miscdev);
+        if (ret != 0) {
+                printk(KERN_ERR PFX "cannot register miscdev on minor=%d (err=%d)\n",
+                        WATCHDOG_MINOR, ret);
+                goto unreg_notifier;
+        }
+
+        tco_timer_stop ();
+
+        printk (KERN_INFO PFX "initialized (0x%04x). heartbeat=%d sec (nowayout=%d)\n",
+                TCOBASE, heartbeat, nowayout);
+
+        return 0;
+
+unreg_notifier:
+        unregister_reboot_notifier(&i8xx_tco_notifier);
+unreg_region:
+        release_region (TCOBASE, 0x10);
+out:
+        return ret;
+}
+
+static void __exit watchdog_cleanup (void)
+{
+        u8 val;
+
+        /* Stop the timer before we leave */
+        if (!nowayout)
+                tco_timer_stop ();
+
+        /* Set the NO_REBOOT bit to prevent later reboots, just for sure */
+        pci_read_config_byte (i8xx_tco_pci, 0xd4, &val);
+        val |= 0x02;
+        pci_write_config_byte (i8xx_tco_pci, 0xd4, val);
+
+        /* Deregister */
+        misc_deregister (&i8xx_tco_miscdev);
+        unregister_reboot_notifier(&i8xx_tco_notifier);
+        release_region (TCOBASE, 0x10);
+}
+
+module_init(watchdog_init);
+module_exit(watchdog_cleanup);
+
+MODULE_AUTHOR("Nils Faerber");
+MODULE_DESCRIPTION("TCO timer driver for i8xx chipsets");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);