Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
Wim Van Sebroeck | 01df0e3 | 2005-08-09 10:07:56 -0700 | [diff] [blame] | 2 | * i8xx_tco: TCO timer driver for i8xx chipsets |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3 | * |
| 4 | * (c) Copyright 2000 kernel concepts <nils@kernelconcepts.de>, All Rights Reserved. |
| 5 | * http://www.kernelconcepts.de |
| 6 | * |
| 7 | * This program is free software; you can redistribute it and/or |
| 8 | * modify it under the terms of the GNU General Public License |
| 9 | * as published by the Free Software Foundation; either version |
| 10 | * 2 of the License, or (at your option) any later version. |
| 11 | * |
| 12 | * Neither kernel concepts nor Nils Faerber admit liability nor provide |
| 13 | * warranty for any of this software. This material is provided |
| 14 | * "AS-IS" and at no charge. |
| 15 | * |
| 16 | * (c) Copyright 2000 kernel concepts <nils@kernelconcepts.de> |
| 17 | * developed for |
| 18 | * Jentro AG, Haar/Munich (Germany) |
| 19 | * |
| 20 | * TCO timer driver for i8xx chipsets |
| 21 | * based on softdog.c by Alan Cox <alan@redhat.com> |
| 22 | * |
| 23 | * The TCO timer is implemented in the following I/O controller hubs: |
| 24 | * (See the intel documentation on http://developer.intel.com.) |
| 25 | * 82801AA (ICH) : document number 290655-003, 290677-014, |
| 26 | * 82801AB (ICHO) : document number 290655-003, 290677-014, |
| 27 | * 82801BA (ICH2) : document number 290687-002, 298242-027, |
| 28 | * 82801BAM (ICH2-M) : document number 290687-002, 298242-027, |
| 29 | * 82801CA (ICH3-S) : document number 290733-003, 290739-013, |
| 30 | * 82801CAM (ICH3-M) : document number 290716-001, 290718-007, |
| 31 | * 82801DB (ICH4) : document number 290744-001, 290745-020, |
| 32 | * 82801DBM (ICH4-M) : document number 252337-001, 252663-005, |
| 33 | * 82801E (C-ICH) : document number 273599-001, 273645-002, |
| 34 | * 82801EB (ICH5) : document number 252516-001, 252517-003, |
| 35 | * 82801ER (ICH5R) : document number 252516-001, 252517-003, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 36 | * |
| 37 | * 20000710 Nils Faerber |
| 38 | * Initial Version 0.01 |
| 39 | * 20000728 Nils Faerber |
| 40 | * 0.02 Fix for SMI_EN->TCO_EN bit, some cleanups |
| 41 | * 20011214 Matt Domsch <Matt_Domsch@dell.com> |
| 42 | * 0.03 Added nowayout module option to override CONFIG_WATCHDOG_NOWAYOUT |
| 43 | * Didn't add timeout option as i810_margin already exists. |
| 44 | * 20020224 Joel Becker, Wim Van Sebroeck |
| 45 | * 0.04 Support for 82801CA(M) chipset, timer margin needs to be > 3, |
| 46 | * add support for WDIOC_SETTIMEOUT and WDIOC_GETTIMEOUT. |
| 47 | * 20020412 Rob Radez <rob@osinvestor.com>, Wim Van Sebroeck |
| 48 | * 0.05 Fix possible timer_alive race, add expect close support, |
| 49 | * clean up ioctls (WDIOC_GETSTATUS, WDIOC_GETBOOTSTATUS and |
| 50 | * WDIOC_SETOPTIONS), made i810tco_getdevice __init, |
| 51 | * removed boot_status, removed tco_timer_read, |
| 52 | * added support for 82801DB and 82801E chipset, |
| 53 | * added support for 82801EB and 8280ER chipset, |
| 54 | * general cleanup. |
| 55 | * 20030921 Wim Van Sebroeck <wim@iguana.be> |
| 56 | * 0.06 change i810_margin to heartbeat, use module_param, |
| 57 | * added notify system support, renamed module to i8xx_tco. |
| 58 | * 20050128 Wim Van Sebroeck <wim@iguana.be> |
| 59 | * 0.07 Added support for the ICH4-M, ICH6, ICH6R, ICH6-M, ICH6W and ICH6RW |
| 60 | * chipsets. Also added support for the "undocumented" ICH7 chipset. |
Wim Van Sebroeck | 01df0e3 | 2005-08-09 10:07:56 -0700 | [diff] [blame] | 61 | * 20050807 Wim Van Sebroeck <wim@iguana.be> |
| 62 | * 0.08 Make sure that the watchdog is only "armed" when started. |
| 63 | * (Kernel Bug 4251) |
Wim Van Sebroeck | 03a8e35 | 2006-04-16 12:52:35 +0200 | [diff] [blame] | 64 | * 20060416 Wim Van Sebroeck <wim@iguana.be> |
| 65 | * 0.09 Remove support for the ICH6, ICH6R, ICH6-M, ICH6W and ICH6RW and |
| 66 | * ICH7 chipsets. (See Kernel Bug 6031 - other code will support these |
| 67 | * chipsets) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 68 | */ |
| 69 | |
| 70 | /* |
| 71 | * Includes, defines, variables, module parameters, ... |
| 72 | */ |
| 73 | |
| 74 | #include <linux/module.h> |
| 75 | #include <linux/moduleparam.h> |
| 76 | #include <linux/types.h> |
| 77 | #include <linux/miscdevice.h> |
| 78 | #include <linux/watchdog.h> |
| 79 | #include <linux/notifier.h> |
| 80 | #include <linux/reboot.h> |
| 81 | #include <linux/init.h> |
| 82 | #include <linux/fs.h> |
| 83 | #include <linux/pci.h> |
| 84 | #include <linux/ioport.h> |
| 85 | |
| 86 | #include <asm/uaccess.h> |
| 87 | #include <asm/io.h> |
| 88 | |
| 89 | #include "i8xx_tco.h" |
| 90 | |
| 91 | /* Module and version information */ |
Wim Van Sebroeck | 03a8e35 | 2006-04-16 12:52:35 +0200 | [diff] [blame] | 92 | #define TCO_VERSION "0.09" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 93 | #define TCO_MODULE_NAME "i8xx TCO timer" |
| 94 | #define TCO_DRIVER_NAME TCO_MODULE_NAME ", v" TCO_VERSION |
| 95 | #define PFX TCO_MODULE_NAME ": " |
| 96 | |
| 97 | /* internal variables */ |
| 98 | static unsigned int ACPIBASE; |
| 99 | static spinlock_t tco_lock; /* Guards the hardware */ |
| 100 | static unsigned long timer_alive; |
| 101 | static char tco_expect_close; |
| 102 | static struct pci_dev *i8xx_tco_pci; |
| 103 | |
| 104 | /* module parameters */ |
| 105 | #define WATCHDOG_HEARTBEAT 30 /* 30 sec default heartbeat (2<heartbeat<39) */ |
| 106 | static int heartbeat = WATCHDOG_HEARTBEAT; /* in seconds */ |
| 107 | module_param(heartbeat, int, 0); |
| 108 | MODULE_PARM_DESC(heartbeat, "Watchdog heartbeat in seconds. (2<heartbeat<39, default=" __MODULE_STRING(WATCHDOG_HEARTBEAT) ")"); |
| 109 | |
Andrey Panin | 4bfdf37 | 2005-07-27 11:43:58 -0700 | [diff] [blame] | 110 | static int nowayout = WATCHDOG_NOWAYOUT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 111 | module_param(nowayout, int, 0); |
| 112 | MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=CONFIG_WATCHDOG_NOWAYOUT)"); |
| 113 | |
| 114 | /* |
| 115 | * Some TCO specific functions |
| 116 | */ |
| 117 | |
| 118 | static inline unsigned char seconds_to_ticks(int seconds) |
| 119 | { |
| 120 | /* the internal timer is stored as ticks which decrement |
| 121 | * every 0.6 seconds */ |
| 122 | return (seconds * 10) / 6; |
| 123 | } |
| 124 | |
| 125 | static int tco_timer_start (void) |
| 126 | { |
| 127 | unsigned char val; |
| 128 | |
| 129 | spin_lock(&tco_lock); |
Wim Van Sebroeck | 01df0e3 | 2005-08-09 10:07:56 -0700 | [diff] [blame] | 130 | |
| 131 | /* disable chipset's NO_REBOOT bit */ |
| 132 | pci_read_config_byte (i8xx_tco_pci, 0xd4, &val); |
| 133 | val &= 0xfd; |
| 134 | pci_write_config_byte (i8xx_tco_pci, 0xd4, val); |
| 135 | |
| 136 | /* Bit 11: TCO Timer Halt -> 0 = The TCO timer is enabled to count */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 137 | val = inb (TCO1_CNT + 1); |
| 138 | val &= 0xf7; |
| 139 | outb (val, TCO1_CNT + 1); |
| 140 | val = inb (TCO1_CNT + 1); |
Wim Van Sebroeck | 01df0e3 | 2005-08-09 10:07:56 -0700 | [diff] [blame] | 141 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 142 | spin_unlock(&tco_lock); |
| 143 | |
| 144 | if (val & 0x08) |
| 145 | return -1; |
| 146 | return 0; |
| 147 | } |
| 148 | |
| 149 | static int tco_timer_stop (void) |
| 150 | { |
Wim Van Sebroeck | 01df0e3 | 2005-08-09 10:07:56 -0700 | [diff] [blame] | 151 | unsigned char val, val1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 152 | |
| 153 | spin_lock(&tco_lock); |
Wim Van Sebroeck | 01df0e3 | 2005-08-09 10:07:56 -0700 | [diff] [blame] | 154 | /* Bit 11: TCO Timer Halt -> 1 = The TCO timer is disabled */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 155 | val = inb (TCO1_CNT + 1); |
| 156 | val |= 0x08; |
| 157 | outb (val, TCO1_CNT + 1); |
| 158 | val = inb (TCO1_CNT + 1); |
Wim Van Sebroeck | 01df0e3 | 2005-08-09 10:07:56 -0700 | [diff] [blame] | 159 | |
| 160 | /* Set the NO_REBOOT bit to prevent later reboots, just for sure */ |
| 161 | pci_read_config_byte (i8xx_tco_pci, 0xd4, &val1); |
| 162 | val1 |= 0x02; |
| 163 | pci_write_config_byte (i8xx_tco_pci, 0xd4, val1); |
| 164 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 165 | spin_unlock(&tco_lock); |
| 166 | |
| 167 | if ((val & 0x08) == 0) |
| 168 | return -1; |
| 169 | return 0; |
| 170 | } |
| 171 | |
| 172 | static int tco_timer_keepalive (void) |
| 173 | { |
| 174 | spin_lock(&tco_lock); |
Wim Van Sebroeck | 01df0e3 | 2005-08-09 10:07:56 -0700 | [diff] [blame] | 175 | /* Reload the timer by writing to the TCO Timer Reload register */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 176 | outb (0x01, TCO1_RLD); |
| 177 | spin_unlock(&tco_lock); |
| 178 | return 0; |
| 179 | } |
| 180 | |
| 181 | static int tco_timer_set_heartbeat (int t) |
| 182 | { |
| 183 | unsigned char val; |
| 184 | unsigned char tmrval; |
| 185 | |
| 186 | tmrval = seconds_to_ticks(t); |
| 187 | /* from the specs: */ |
| 188 | /* "Values of 0h-3h are ignored and should not be attempted" */ |
| 189 | if (tmrval > 0x3f || tmrval < 0x04) |
| 190 | return -EINVAL; |
| 191 | |
| 192 | /* Write new heartbeat to watchdog */ |
| 193 | spin_lock(&tco_lock); |
| 194 | val = inb (TCO1_TMR); |
| 195 | val &= 0xc0; |
| 196 | val |= tmrval; |
| 197 | outb (val, TCO1_TMR); |
| 198 | val = inb (TCO1_TMR); |
| 199 | spin_unlock(&tco_lock); |
| 200 | |
| 201 | if ((val & 0x3f) != tmrval) |
| 202 | return -EINVAL; |
| 203 | |
| 204 | heartbeat = t; |
| 205 | return 0; |
| 206 | } |
| 207 | |
Wim Van Sebroeck | 58b519f | 2006-05-21 12:48:44 +0200 | [diff] [blame] | 208 | static int tco_timer_get_timeleft (int *time_left) |
| 209 | { |
| 210 | unsigned char val; |
| 211 | |
| 212 | spin_lock(&tco_lock); |
| 213 | |
| 214 | /* read the TCO Timer */ |
| 215 | val = inb (TCO1_RLD); |
| 216 | val &= 0x3f; |
| 217 | |
| 218 | spin_unlock(&tco_lock); |
| 219 | |
| 220 | *time_left = (int)((val * 6) / 10); |
| 221 | |
| 222 | return 0; |
| 223 | } |
| 224 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 225 | /* |
| 226 | * /dev/watchdog handling |
| 227 | */ |
| 228 | |
| 229 | static int i8xx_tco_open (struct inode *inode, struct file *file) |
| 230 | { |
| 231 | /* /dev/watchdog can only be opened once */ |
| 232 | if (test_and_set_bit(0, &timer_alive)) |
| 233 | return -EBUSY; |
| 234 | |
| 235 | /* |
| 236 | * Reload and activate timer |
| 237 | */ |
| 238 | tco_timer_keepalive (); |
| 239 | tco_timer_start (); |
| 240 | return nonseekable_open(inode, file); |
| 241 | } |
| 242 | |
| 243 | static int i8xx_tco_release (struct inode *inode, struct file *file) |
| 244 | { |
| 245 | /* |
| 246 | * Shut off the timer. |
| 247 | */ |
| 248 | if (tco_expect_close == 42) { |
| 249 | tco_timer_stop (); |
| 250 | } else { |
| 251 | printk(KERN_CRIT PFX "Unexpected close, not stopping watchdog!\n"); |
| 252 | tco_timer_keepalive (); |
| 253 | } |
| 254 | clear_bit(0, &timer_alive); |
| 255 | tco_expect_close = 0; |
| 256 | return 0; |
| 257 | } |
| 258 | |
| 259 | static ssize_t i8xx_tco_write (struct file *file, const char __user *data, |
| 260 | size_t len, loff_t * ppos) |
| 261 | { |
| 262 | /* See if we got the magic character 'V' and reload the timer */ |
| 263 | if (len) { |
| 264 | if (!nowayout) { |
| 265 | size_t i; |
| 266 | |
| 267 | /* note: just in case someone wrote the magic character |
| 268 | * five months ago... */ |
| 269 | tco_expect_close = 0; |
| 270 | |
| 271 | /* scan to see whether or not we got the magic character */ |
| 272 | for (i = 0; i != len; i++) { |
| 273 | char c; |
| 274 | if(get_user(c, data+i)) |
| 275 | return -EFAULT; |
| 276 | if (c == 'V') |
| 277 | tco_expect_close = 42; |
| 278 | } |
| 279 | } |
| 280 | |
| 281 | /* someone wrote to us, we should reload the timer */ |
| 282 | tco_timer_keepalive (); |
| 283 | } |
| 284 | return len; |
| 285 | } |
| 286 | |
| 287 | static int i8xx_tco_ioctl (struct inode *inode, struct file *file, |
| 288 | unsigned int cmd, unsigned long arg) |
| 289 | { |
| 290 | int new_options, retval = -EINVAL; |
| 291 | int new_heartbeat; |
Wim Van Sebroeck | 58b519f | 2006-05-21 12:48:44 +0200 | [diff] [blame] | 292 | int time_left; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 293 | void __user *argp = (void __user *)arg; |
| 294 | int __user *p = argp; |
| 295 | static struct watchdog_info ident = { |
| 296 | .options = WDIOF_SETTIMEOUT | |
| 297 | WDIOF_KEEPALIVEPING | |
| 298 | WDIOF_MAGICCLOSE, |
| 299 | .firmware_version = 0, |
| 300 | .identity = TCO_MODULE_NAME, |
| 301 | }; |
| 302 | |
| 303 | switch (cmd) { |
| 304 | case WDIOC_GETSUPPORT: |
| 305 | return copy_to_user(argp, &ident, |
| 306 | sizeof (ident)) ? -EFAULT : 0; |
| 307 | |
| 308 | case WDIOC_GETSTATUS: |
| 309 | case WDIOC_GETBOOTSTATUS: |
| 310 | return put_user (0, p); |
| 311 | |
| 312 | case WDIOC_KEEPALIVE: |
| 313 | tco_timer_keepalive (); |
| 314 | return 0; |
| 315 | |
| 316 | case WDIOC_SETOPTIONS: |
| 317 | { |
| 318 | if (get_user (new_options, p)) |
| 319 | return -EFAULT; |
| 320 | |
| 321 | if (new_options & WDIOS_DISABLECARD) { |
| 322 | tco_timer_stop (); |
| 323 | retval = 0; |
| 324 | } |
| 325 | |
| 326 | if (new_options & WDIOS_ENABLECARD) { |
| 327 | tco_timer_keepalive (); |
| 328 | tco_timer_start (); |
| 329 | retval = 0; |
| 330 | } |
| 331 | |
| 332 | return retval; |
| 333 | } |
| 334 | |
| 335 | case WDIOC_SETTIMEOUT: |
| 336 | { |
| 337 | if (get_user(new_heartbeat, p)) |
| 338 | return -EFAULT; |
| 339 | |
| 340 | if (tco_timer_set_heartbeat(new_heartbeat)) |
Wim Van Sebroeck | 58b519f | 2006-05-21 12:48:44 +0200 | [diff] [blame] | 341 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 342 | |
| 343 | tco_timer_keepalive (); |
| 344 | /* Fall */ |
| 345 | } |
| 346 | |
| 347 | case WDIOC_GETTIMEOUT: |
| 348 | return put_user(heartbeat, p); |
| 349 | |
Wim Van Sebroeck | 58b519f | 2006-05-21 12:48:44 +0200 | [diff] [blame] | 350 | case WDIOC_GETTIMELEFT: |
| 351 | { |
| 352 | if (tco_timer_get_timeleft(&time_left)) |
| 353 | return -EINVAL; |
| 354 | |
| 355 | return put_user(time_left, p); |
| 356 | } |
| 357 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 358 | default: |
| 359 | return -ENOIOCTLCMD; |
| 360 | } |
| 361 | } |
| 362 | |
| 363 | /* |
| 364 | * Notify system |
| 365 | */ |
| 366 | |
| 367 | static int i8xx_tco_notify_sys (struct notifier_block *this, unsigned long code, void *unused) |
| 368 | { |
| 369 | if (code==SYS_DOWN || code==SYS_HALT) { |
| 370 | /* Turn the WDT off */ |
| 371 | tco_timer_stop (); |
| 372 | } |
| 373 | |
| 374 | return NOTIFY_DONE; |
| 375 | } |
| 376 | |
| 377 | /* |
| 378 | * Kernel Interfaces |
| 379 | */ |
| 380 | |
Arjan van de Ven | 62322d2 | 2006-07-03 00:24:21 -0700 | [diff] [blame] | 381 | static const struct file_operations i8xx_tco_fops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 382 | .owner = THIS_MODULE, |
| 383 | .llseek = no_llseek, |
| 384 | .write = i8xx_tco_write, |
| 385 | .ioctl = i8xx_tco_ioctl, |
| 386 | .open = i8xx_tco_open, |
| 387 | .release = i8xx_tco_release, |
| 388 | }; |
| 389 | |
| 390 | static struct miscdevice i8xx_tco_miscdev = { |
| 391 | .minor = WATCHDOG_MINOR, |
| 392 | .name = "watchdog", |
| 393 | .fops = &i8xx_tco_fops, |
| 394 | }; |
| 395 | |
| 396 | static struct notifier_block i8xx_tco_notifier = { |
| 397 | .notifier_call = i8xx_tco_notify_sys, |
| 398 | }; |
| 399 | |
| 400 | /* |
| 401 | * Data for PCI driver interface |
| 402 | * |
| 403 | * This data only exists for exporting the supported |
| 404 | * PCI ids via MODULE_DEVICE_TABLE. We do not actually |
| 405 | * register a pci_driver, because someone else might one day |
| 406 | * want to register another driver on the same PCI id. |
| 407 | */ |
| 408 | static struct pci_device_id i8xx_tco_pci_tbl[] = { |
| 409 | { PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801AA_0, PCI_ANY_ID, PCI_ANY_ID, }, |
| 410 | { PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801AB_0, PCI_ANY_ID, PCI_ANY_ID, }, |
| 411 | { PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801BA_0, PCI_ANY_ID, PCI_ANY_ID, }, |
| 412 | { PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801BA_10, PCI_ANY_ID, PCI_ANY_ID, }, |
| 413 | { PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801CA_0, PCI_ANY_ID, PCI_ANY_ID, }, |
| 414 | { PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801CA_12, PCI_ANY_ID, PCI_ANY_ID, }, |
| 415 | { PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801DB_0, PCI_ANY_ID, PCI_ANY_ID, }, |
| 416 | { PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801DB_12, PCI_ANY_ID, PCI_ANY_ID, }, |
| 417 | { PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801E_0, PCI_ANY_ID, PCI_ANY_ID, }, |
| 418 | { PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801EB_0, PCI_ANY_ID, PCI_ANY_ID, }, |
Peter Lundkvist | a123eda | 2005-05-16 21:53:12 -0700 | [diff] [blame] | 419 | { PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ESB_1, PCI_ANY_ID, PCI_ANY_ID, }, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 420 | { 0, }, /* End of list */ |
| 421 | }; |
| 422 | MODULE_DEVICE_TABLE (pci, i8xx_tco_pci_tbl); |
| 423 | |
| 424 | /* |
| 425 | * Init & exit routines |
| 426 | */ |
| 427 | |
| 428 | static unsigned char __init i8xx_tco_getdevice (void) |
| 429 | { |
| 430 | struct pci_dev *dev = NULL; |
| 431 | u8 val1, val2; |
| 432 | u16 badr; |
| 433 | /* |
| 434 | * Find the PCI device |
| 435 | */ |
| 436 | |
| 437 | while ((dev = pci_find_device(PCI_ANY_ID, PCI_ANY_ID, dev)) != NULL) { |
Greg Kroah-Hartman | 7586585 | 2005-06-30 02:18:12 -0700 | [diff] [blame] | 438 | if (pci_match_id(i8xx_tco_pci_tbl, dev)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 439 | i8xx_tco_pci = dev; |
| 440 | break; |
| 441 | } |
| 442 | } |
| 443 | |
| 444 | if (i8xx_tco_pci) { |
| 445 | /* |
| 446 | * Find the ACPI base I/O address which is the base |
| 447 | * for the TCO registers (TCOBASE=ACPIBASE + 0x60) |
| 448 | * ACPIBASE is bits [15:7] from 0x40-0x43 |
| 449 | */ |
| 450 | pci_read_config_byte (i8xx_tco_pci, 0x40, &val1); |
| 451 | pci_read_config_byte (i8xx_tco_pci, 0x41, &val2); |
| 452 | badr = ((val2 << 1) | (val1 >> 7)) << 7; |
| 453 | ACPIBASE = badr; |
| 454 | /* Something's wrong here, ACPIBASE has to be set */ |
| 455 | if (badr == 0x0001 || badr == 0x0000) { |
| 456 | printk (KERN_ERR PFX "failed to get TCOBASE address\n"); |
| 457 | return 0; |
| 458 | } |
Wim Van Sebroeck | 01df0e3 | 2005-08-09 10:07:56 -0700 | [diff] [blame] | 459 | |
| 460 | /* Check chipset's NO_REBOOT bit */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 461 | pci_read_config_byte (i8xx_tco_pci, 0xd4, &val1); |
| 462 | if (val1 & 0x02) { |
| 463 | val1 &= 0xfd; |
| 464 | pci_write_config_byte (i8xx_tco_pci, 0xd4, val1); |
| 465 | pci_read_config_byte (i8xx_tco_pci, 0xd4, &val1); |
| 466 | if (val1 & 0x02) { |
| 467 | printk (KERN_ERR PFX "failed to reset NO_REBOOT flag, reboot disabled by hardware\n"); |
| 468 | return 0; /* Cannot reset NO_REBOOT bit */ |
| 469 | } |
| 470 | } |
Wim Van Sebroeck | 01df0e3 | 2005-08-09 10:07:56 -0700 | [diff] [blame] | 471 | /* Disable reboots untill the watchdog starts */ |
| 472 | val1 |= 0x02; |
| 473 | pci_write_config_byte (i8xx_tco_pci, 0xd4, val1); |
| 474 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 475 | /* Set the TCO_EN bit in SMI_EN register */ |
| 476 | if (!request_region (SMI_EN + 1, 1, "i8xx TCO")) { |
| 477 | printk (KERN_ERR PFX "I/O address 0x%04x already in use\n", |
| 478 | SMI_EN + 1); |
| 479 | return 0; |
| 480 | } |
| 481 | val1 = inb (SMI_EN + 1); |
| 482 | val1 &= 0xdf; |
| 483 | outb (val1, SMI_EN + 1); |
| 484 | release_region (SMI_EN + 1, 1); |
| 485 | return 1; |
| 486 | } |
| 487 | return 0; |
| 488 | } |
| 489 | |
| 490 | static int __init watchdog_init (void) |
| 491 | { |
| 492 | int ret; |
| 493 | |
| 494 | spin_lock_init(&tco_lock); |
| 495 | |
| 496 | /* Check whether or not the hardware watchdog is there */ |
| 497 | if (!i8xx_tco_getdevice () || i8xx_tco_pci == NULL) |
| 498 | return -ENODEV; |
| 499 | |
| 500 | if (!request_region (TCOBASE, 0x10, "i8xx TCO")) { |
| 501 | printk (KERN_ERR PFX "I/O address 0x%04x already in use\n", |
| 502 | TCOBASE); |
| 503 | ret = -EIO; |
| 504 | goto out; |
| 505 | } |
| 506 | |
| 507 | /* Clear out the (probably old) status */ |
| 508 | outb (0, TCO1_STS); |
| 509 | outb (3, TCO2_STS); |
| 510 | |
| 511 | /* Check that the heartbeat value is within it's range ; if not reset to the default */ |
| 512 | if (tco_timer_set_heartbeat (heartbeat)) { |
| 513 | heartbeat = WATCHDOG_HEARTBEAT; |
| 514 | tco_timer_set_heartbeat (heartbeat); |
| 515 | printk(KERN_INFO PFX "heartbeat value must be 2<heartbeat<39, using %d\n", |
| 516 | heartbeat); |
| 517 | } |
| 518 | |
| 519 | ret = register_reboot_notifier(&i8xx_tco_notifier); |
| 520 | if (ret != 0) { |
| 521 | printk(KERN_ERR PFX "cannot register reboot notifier (err=%d)\n", |
| 522 | ret); |
| 523 | goto unreg_region; |
| 524 | } |
| 525 | |
| 526 | ret = misc_register(&i8xx_tco_miscdev); |
| 527 | if (ret != 0) { |
| 528 | printk(KERN_ERR PFX "cannot register miscdev on minor=%d (err=%d)\n", |
| 529 | WATCHDOG_MINOR, ret); |
| 530 | goto unreg_notifier; |
| 531 | } |
| 532 | |
| 533 | tco_timer_stop (); |
| 534 | |
| 535 | printk (KERN_INFO PFX "initialized (0x%04x). heartbeat=%d sec (nowayout=%d)\n", |
| 536 | TCOBASE, heartbeat, nowayout); |
| 537 | |
| 538 | return 0; |
| 539 | |
| 540 | unreg_notifier: |
| 541 | unregister_reboot_notifier(&i8xx_tco_notifier); |
| 542 | unreg_region: |
| 543 | release_region (TCOBASE, 0x10); |
| 544 | out: |
| 545 | return ret; |
| 546 | } |
| 547 | |
| 548 | static void __exit watchdog_cleanup (void) |
| 549 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 550 | /* Stop the timer before we leave */ |
| 551 | if (!nowayout) |
| 552 | tco_timer_stop (); |
| 553 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 554 | /* Deregister */ |
| 555 | misc_deregister (&i8xx_tco_miscdev); |
| 556 | unregister_reboot_notifier(&i8xx_tco_notifier); |
| 557 | release_region (TCOBASE, 0x10); |
| 558 | } |
| 559 | |
| 560 | module_init(watchdog_init); |
| 561 | module_exit(watchdog_cleanup); |
| 562 | |
| 563 | MODULE_AUTHOR("Nils Faerber"); |
| 564 | MODULE_DESCRIPTION("TCO timer driver for i8xx chipsets"); |
| 565 | MODULE_LICENSE("GPL"); |
| 566 | MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR); |