1/* 2 * intel TCO vendor specific watchdog driver support 3 * 4 * (c) Copyright 2006-2009 Wim Van Sebroeck <wim@iguana.be>. 5 * 6 * This program is free software; you can redistribute it and/or 7 * modify it under the terms of the GNU General Public License 8 * as published by the Free Software Foundation; either version 9 * 2 of the License, or (at your option) any later version. 10 * 11 * Neither Wim Van Sebroeck nor Iguana vzw. admit liability nor 12 * provide warranty for any of this software. This material is 13 * provided "AS-IS" and at no charge. 14 */ 15 16/* 17 * Includes, defines, variables, module parameters, ... 18 */ 19 20/* Module and version information */ 21#define DRV_NAME "iTCO_vendor_support" 22#define DRV_VERSION "1.04" 23#define PFX DRV_NAME ": " 24 25/* Includes */ 26#include <linux/module.h> /* For module specific items */ 27#include <linux/moduleparam.h> /* For new moduleparam's */ 28#include <linux/types.h> /* For standard types (like size_t) */ 29#include <linux/errno.h> /* For the -ENODEV/... values */ 30#include <linux/kernel.h> /* For printk/panic/... */ 31#include <linux/init.h> /* For __init/__exit/... */ 32#include <linux/ioport.h> /* For io-port access */ 33#include <linux/io.h> /* For inb/outb/... */ 34 35#include "iTCO_vendor.h" 36 37/* iTCO defines */ 38#define SMI_EN (acpibase + 0x30) /* SMI Control and Enable Register */ 39#define TCOBASE (acpibase + 0x60) /* TCO base address */ 40#define TCO1_STS (TCOBASE + 0x04) /* TCO1 Status Register */ 41 42/* List of vendor support modes */ 43/* SuperMicro Pentium 3 Era 370SSE+-OEM1/P3TSSE */ 44#define SUPERMICRO_OLD_BOARD 1 45/* SuperMicro Pentium 4 / Xeon 4 / EMT64T Era Systems */ 46#define SUPERMICRO_NEW_BOARD 2 47/* Broken BIOS */ 48#define BROKEN_BIOS 911 49 50static int vendorsupport; 51module_param(vendorsupport, int, 0); 52MODULE_PARM_DESC(vendorsupport, "iTCO vendor specific support mode, default=" 53 "0 (none), 1=SuperMicro Pent3, 2=SuperMicro Pent4+, " 54 "911=Broken SMI BIOS"); 55 56/* 57 * Vendor Specific Support 58 */ 59 60/* 61 * Vendor Support: 1 62 * Board: Super Micro Computer Inc. 370SSE+-OEM1/P3TSSE 63 * iTCO chipset: ICH2 64 * 65 * Code contributed by: R. Seretny <lkpatches@paypc.com> 66 * Documentation obtained by R. Seretny from SuperMicro Technical Support 67 * 68 * To enable Watchdog function: 69 * BIOS setup -> Power -> TCO Logic SMI Enable -> Within5Minutes 70 * This setting enables SMI to clear the watchdog expired flag. 71 * If BIOS or CPU fail which may cause SMI hang, then system will 72 * reboot. When application starts to use watchdog function, 73 * application has to take over the control from SMI. 74 * 75 * For P3TSSE, J36 jumper needs to be removed to enable the Watchdog 76 * function. 77 * 78 * Note: The system will reboot when Expire Flag is set TWICE. 79 * So, if the watchdog timer is 20 seconds, then the maximum hang 80 * time is about 40 seconds, and the minimum hang time is about 81 * 20.6 seconds. 82 */ 83 84static void supermicro_old_pre_start(unsigned long acpibase) 85{ 86 unsigned long val32; 87 88 /* Bit 13: TCO_EN -> 0 = Disables TCO logic generating an SMI# */ 89 val32 = inl(SMI_EN); 90 val32 &= 0xffffdfff; /* Turn off SMI clearing watchdog */ 91 outl(val32, SMI_EN); /* Needed to activate watchdog */ 92} 93 94static void supermicro_old_pre_stop(unsigned long acpibase) 95{ 96 unsigned long val32; 97 98 /* Bit 13: TCO_EN -> 1 = Enables the TCO logic to generate SMI# */ 99 val32 = inl(SMI_EN); 100 val32 |= 0x00002000; /* Turn on SMI clearing watchdog */ 101 outl(val32, SMI_EN); /* Needed to deactivate watchdog */ 102} 103 104/* 105 * Vendor Support: 2 106 * Board: Super Micro Computer Inc. P4SBx, P4DPx 107 * iTCO chipset: ICH4 108 * 109 * Code contributed by: R. Seretny <lkpatches@paypc.com> 110 * Documentation obtained by R. Seretny from SuperMicro Technical Support 111 * 112 * To enable Watchdog function: 113 * 1. BIOS 114 * For P4SBx: 115 * BIOS setup -> Advanced -> Integrated Peripherals -> Watch Dog Feature 116 * For P4DPx: 117 * BIOS setup -> Advanced -> I/O Device Configuration -> Watch Dog 118 * This setting enables or disables Watchdog function. When enabled, the 119 * default watchdog timer is set to be 5 minutes (about 4m35s). It is 120 * enough to load and run the OS. The application (service or driver) has 121 * to take over the control once OS is running up and before watchdog 122 * expires. 123 * 124 * 2. JUMPER 125 * For P4SBx: JP39 126 * For P4DPx: JP37 127 * This jumper is used for safety. Closed is enabled. This jumper 128 * prevents user enables watchdog in BIOS by accident. 129 * 130 * To enable Watch Dog function, both BIOS and JUMPER must be enabled. 131 * 132 * The documentation lists motherboards P4SBx and P4DPx series as of 133 * 20-March-2002. However, this code works flawlessly with much newer 134 * motherboards, such as my X6DHR-8G2 (SuperServer 6014H-82). 135 * 136 * The original iTCO driver as written does not actually reset the 137 * watchdog timer on these machines, as a result they reboot after five 138 * minutes. 139 * 140 * NOTE: You may leave the Watchdog function disabled in the SuperMicro 141 * BIOS to avoid a "boot-race"... This driver will enable watchdog 142 * functionality even if it's disabled in the BIOS once the /dev/watchdog 143 * file is opened. 144 */ 145 146/* I/O Port's */ 147#define SM_REGINDEX 0x2e /* SuperMicro ICH4+ Register Index */ 148#define SM_DATAIO 0x2f /* SuperMicro ICH4+ Register Data I/O */ 149 150/* Control Register's */ 151#define SM_CTLPAGESW 0x07 /* SuperMicro ICH4+ Control Page Switch */ 152#define SM_CTLPAGE 0x08 /* SuperMicro ICH4+ Control Page Num */ 153 154#define SM_WATCHENABLE 0x30 /* Watchdog enable: Bit 0: 0=off, 1=on */ 155 156#define SM_WATCHPAGE 0x87 /* Watchdog unlock control page */ 157 158#define SM_ENDWATCH 0xAA /* Watchdog lock control page */ 159 160#define SM_COUNTMODE 0xf5 /* Watchdog count mode select */ 161 /* (Bit 3: 0 = seconds, 1 = minutes */ 162 163#define SM_WATCHTIMER 0xf6 /* 8-bits, Watchdog timer counter (RW) */ 164 165#define SM_RESETCONTROL 0xf7 /* Watchdog reset control */ 166 /* Bit 6: timer is reset by kbd interrupt */ 167 /* Bit 7: timer is reset by mouse interrupt */ 168 169static void supermicro_new_unlock_watchdog(void) 170{ 171 /* Write 0x87 to port 0x2e twice */ 172 outb(SM_WATCHPAGE, SM_REGINDEX); 173 outb(SM_WATCHPAGE, SM_REGINDEX); 174 /* Switch to watchdog control page */ 175 outb(SM_CTLPAGESW, SM_REGINDEX); 176 outb(SM_CTLPAGE, SM_DATAIO); 177} 178 179static void supermicro_new_lock_watchdog(void) 180{ 181 outb(SM_ENDWATCH, SM_REGINDEX); 182} 183 184static void supermicro_new_pre_start(unsigned int heartbeat) 185{ 186 unsigned int val; 187 188 supermicro_new_unlock_watchdog(); 189 190 /* Watchdog timer setting needs to be in seconds*/ 191 outb(SM_COUNTMODE, SM_REGINDEX); 192 val = inb(SM_DATAIO); 193 val &= 0xF7; 194 outb(val, SM_DATAIO); 195 196 /* Write heartbeat interval to WDOG */ 197 outb(SM_WATCHTIMER, SM_REGINDEX); 198 outb((heartbeat & 255), SM_DATAIO); 199 200 /* Make sure keyboard/mouse interrupts don't interfere */ 201 outb(SM_RESETCONTROL, SM_REGINDEX); 202 val = inb(SM_DATAIO); 203 val &= 0x3f; 204 outb(val, SM_DATAIO); 205 206 /* enable watchdog by setting bit 0 of Watchdog Enable to 1 */ 207 outb(SM_WATCHENABLE, SM_REGINDEX); 208 val = inb(SM_DATAIO); 209 val |= 0x01; 210 outb(val, SM_DATAIO); 211 212 supermicro_new_lock_watchdog(); 213} 214 215static void supermicro_new_pre_stop(void) 216{ 217 unsigned int val; 218 219 supermicro_new_unlock_watchdog(); 220 221 /* disable watchdog by setting bit 0 of Watchdog Enable to 0 */ 222 outb(SM_WATCHENABLE, SM_REGINDEX); 223 val = inb(SM_DATAIO); 224 val &= 0xFE; 225 outb(val, SM_DATAIO); 226 227 supermicro_new_lock_watchdog(); 228} 229 230static void supermicro_new_pre_set_heartbeat(unsigned int heartbeat) 231{ 232 supermicro_new_unlock_watchdog(); 233 234 /* reset watchdog timeout to heartveat value */ 235 outb(SM_WATCHTIMER, SM_REGINDEX); 236 outb((heartbeat & 255), SM_DATAIO); 237 238 supermicro_new_lock_watchdog(); 239} 240 241/* 242 * Vendor Support: 911 243 * Board: Some Intel ICHx based motherboards 244 * iTCO chipset: ICH7+ 245 * 246 * Some Intel motherboards have a broken BIOS implementation: i.e. 247 * the SMI handler clear's the TIMEOUT bit in the TC01_STS register 248 * and does not reload the time. Thus the TCO watchdog does not reboot 249 * the system. 250 * 251 * These are the conclusions of Andriy Gapon <avg@icyb.net.ua> after 252 * debugging: the SMI handler is quite simple - it tests value in 253 * TCO1_CNT against 0x800, i.e. checks TCO_TMR_HLT. If the bit is set 254 * the handler goes into an infinite loop, apparently to allow the 255 * second timeout and reboot. Otherwise it simply clears TIMEOUT bit 256 * in TCO1_STS and that's it. 257 * So the logic seems to be reversed, because it is hard to see how 258 * TIMEOUT can get set to 1 and SMI generated when TCO_TMR_HLT is set 259 * (other than a transitional effect). 260 * 261 * The only fix found to get the motherboard(s) to reboot is to put 262 * the glb_smi_en bit to 0. This is a dirty hack that bypasses the 263 * broken code by disabling Global SMI. 264 * 265 * WARNING: globally disabling SMI could possibly lead to dramatic 266 * problems, especially on laptops! I.e. various ACPI things where 267 * SMI is used for communication between OS and firmware. 268 * 269 * Don't use this fix if you don't need to!!! 270 */ 271 272static void broken_bios_start(unsigned long acpibase) 273{ 274 unsigned long val32; 275 276 val32 = inl(SMI_EN); 277 /* Bit 13: TCO_EN -> 0 = Disables TCO logic generating an SMI# 278 Bit 0: GBL_SMI_EN -> 0 = No SMI# will be generated by ICH. */ 279 val32 &= 0xffffdffe; 280 outl(val32, SMI_EN); 281} 282 283static void broken_bios_stop(unsigned long acpibase) 284{ 285 unsigned long val32; 286 287 val32 = inl(SMI_EN); 288 /* Bit 13: TCO_EN -> 1 = Enables TCO logic generating an SMI# 289 Bit 0: GBL_SMI_EN -> 1 = Turn global SMI on again. */ 290 val32 |= 0x00002001; 291 outl(val32, SMI_EN); 292} 293 294/* 295 * Generic Support Functions 296 */ 297 298void iTCO_vendor_pre_start(unsigned long acpibase, 299 unsigned int heartbeat) 300{ 301 switch (vendorsupport) { 302 case SUPERMICRO_OLD_BOARD: 303 supermicro_old_pre_start(acpibase); 304 break; 305 case SUPERMICRO_NEW_BOARD: 306 supermicro_new_pre_start(heartbeat); 307 break; 308 case BROKEN_BIOS: 309 broken_bios_start(acpibase); 310 break; 311 } 312} 313EXPORT_SYMBOL(iTCO_vendor_pre_start); 314 315void iTCO_vendor_pre_stop(unsigned long acpibase) 316{ 317 switch (vendorsupport) { 318 case SUPERMICRO_OLD_BOARD: 319 supermicro_old_pre_stop(acpibase); 320 break; 321 case SUPERMICRO_NEW_BOARD: 322 supermicro_new_pre_stop(); 323 break; 324 case BROKEN_BIOS: 325 broken_bios_stop(acpibase); 326 break; 327 } 328} 329EXPORT_SYMBOL(iTCO_vendor_pre_stop); 330 331void iTCO_vendor_pre_keepalive(unsigned long acpibase, unsigned int heartbeat) 332{ 333 if (vendorsupport == SUPERMICRO_NEW_BOARD) 334 supermicro_new_pre_set_heartbeat(heartbeat); 335} 336EXPORT_SYMBOL(iTCO_vendor_pre_keepalive); 337 338void iTCO_vendor_pre_set_heartbeat(unsigned int heartbeat) 339{ 340 if (vendorsupport == SUPERMICRO_NEW_BOARD) 341 supermicro_new_pre_set_heartbeat(heartbeat); 342} 343EXPORT_SYMBOL(iTCO_vendor_pre_set_heartbeat); 344 345int iTCO_vendor_check_noreboot_on(void) 346{ 347 switch (vendorsupport) { 348 case SUPERMICRO_OLD_BOARD: 349 return 0; 350 default: 351 return 1; 352 } 353} 354EXPORT_SYMBOL(iTCO_vendor_check_noreboot_on); 355 356static int __init iTCO_vendor_init_module(void) 357{ 358 printk(KERN_INFO PFX "vendor-support=%d\n", vendorsupport); 359 return 0; 360} 361 362static void __exit iTCO_vendor_exit_module(void) 363{ 364 printk(KERN_INFO PFX "Module Unloaded\n"); 365} 366 367module_init(iTCO_vendor_init_module); 368module_exit(iTCO_vendor_exit_module); 369 370MODULE_AUTHOR("Wim Van Sebroeck <wim@iguana.be>, " 371 "R. Seretny <lkpatches@paypc.com>"); 372MODULE_DESCRIPTION("Intel TCO Vendor Specific WatchDog Timer Driver Support"); 373MODULE_VERSION(DRV_VERSION); 374MODULE_LICENSE("GPL"); 375