| /* |
| * i8xx_tco: 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, |
| * |
| * 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. |
| * 20050807 Wim Van Sebroeck <wim@iguana.be> |
| * 0.08 Make sure that the watchdog is only "armed" when started. |
| * (Kernel Bug 4251) |
| * 20060416 Wim Van Sebroeck <wim@iguana.be> |
| * 0.09 Remove support for the ICH6, ICH6R, ICH6-M, ICH6W and ICH6RW and |
| * ICH7 chipsets. (See Kernel Bug 6031 - other code will support these |
| * chipsets) |
| */ |
| |
| /* |
| * 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 "0.09" |
| #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) ")"); |
| |
| static int nowayout = WATCHDOG_NOWAYOUT; |
| 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); |
| |
| /* disable chipset's NO_REBOOT bit */ |
| pci_read_config_byte (i8xx_tco_pci, 0xd4, &val); |
| val &= 0xfd; |
| pci_write_config_byte (i8xx_tco_pci, 0xd4, val); |
| |
| /* Bit 11: TCO Timer Halt -> 0 = The TCO timer is enabled to count */ |
| 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, val1; |
| |
| spin_lock(&tco_lock); |
| /* Bit 11: TCO Timer Halt -> 1 = The TCO timer is disabled */ |
| val = inb (TCO1_CNT + 1); |
| val |= 0x08; |
| outb (val, TCO1_CNT + 1); |
| val = inb (TCO1_CNT + 1); |
| |
| /* Set the NO_REBOOT bit to prevent later reboots, just for sure */ |
| pci_read_config_byte (i8xx_tco_pci, 0xd4, &val1); |
| val1 |= 0x02; |
| pci_write_config_byte (i8xx_tco_pci, 0xd4, val1); |
| |
| spin_unlock(&tco_lock); |
| |
| if ((val & 0x08) == 0) |
| return -1; |
| return 0; |
| } |
| |
| static int tco_timer_keepalive (void) |
| { |
| spin_lock(&tco_lock); |
| /* Reload the timer by writing to the TCO Timer Reload register */ |
| 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; |
| } |
| |
| static int tco_timer_get_timeleft (int *time_left) |
| { |
| unsigned char val; |
| |
| spin_lock(&tco_lock); |
| |
| /* read the TCO Timer */ |
| val = inb (TCO1_RLD); |
| val &= 0x3f; |
| |
| spin_unlock(&tco_lock); |
| |
| *time_left = (int)((val * 6) / 10); |
| |
| 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; |
| int time_left; |
| 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); |
| |
| case WDIOC_GETTIMELEFT: |
| { |
| if (tco_timer_get_timeleft(&time_left)) |
| return -EINVAL; |
| |
| return put_user(time_left, 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 const 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_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801AA_0) }, |
| { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801AB_0) }, |
| { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801BA_0) }, |
| { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801BA_10) }, |
| { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801CA_0) }, |
| { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801CA_12) }, |
| { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801DB_0) }, |
| { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801DB_12) }, |
| { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801E_0) }, |
| { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801EB_0) }, |
| { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ESB_1) }, |
| { }, /* 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 |
| */ |
| |
| for_each_pci_dev(dev) |
| if (pci_match_id(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"); |
| pci_dev_put(i8xx_tco_pci); |
| 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"); |
| pci_dev_put(i8xx_tco_pci); |
| return 0; /* Cannot reset NO_REBOOT bit */ |
| } |
| } |
| /* Disable reboots untill the watchdog starts */ |
| val1 |= 0x02; |
| pci_write_config_byte (i8xx_tco_pci, 0xd4, val1); |
| |
| /* 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); |
| pci_dev_put(i8xx_tco_pci); |
| 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: |
| pci_dev_put(i8xx_tco_pci); |
| return ret; |
| } |
| |
| static void __exit watchdog_cleanup (void) |
| { |
| /* Stop the timer before we leave */ |
| if (!nowayout) |
| tco_timer_stop (); |
| |
| /* Deregister */ |
| misc_deregister (&i8xx_tco_miscdev); |
| unregister_reboot_notifier(&i8xx_tco_notifier); |
| release_region (TCOBASE, 0x10); |
| |
| pci_dev_put(i8xx_tco_pci); |
| } |
| |
| 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); |