diff options
Diffstat (limited to 'drivers/char/watchdog/i8xx_tco.c')
| -rw-r--r-- | drivers/char/watchdog/i8xx_tco.c | 535 |
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 00000000000..c337978dc96 --- /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); |