summaryrefslogtreecommitdiff
path: root/drivers/char/watchdog/i8xx_tco.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/char/watchdog/i8xx_tco.c')
-rw-r--r--drivers/char/watchdog/i8xx_tco.c535
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);
generated by cgit v1.2.3 (git 2.39.0) at 2024-12-21 18:48:27 +0300