drivers/watchdog/iTCO_vendor_support.c

   1 /*
   2  *      intel TCO vendor specific watchdog driver support
   3  *
   4  *      (c) Copyright 2006 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     "1.01"
  23 #define DRV_RELDATE     "11-Nov-2006"
  24 #define PFX             DRV_NAME ": "
  25
  26 /* Includes */
  27 #include <linux/module.h>               /* For module specific items */
  28 #include <linux/moduleparam.h>          /* For new moduleparam's */
  29 #include <linux/types.h>                /* For standard types (like size_t) */
  30 #include <linux/errno.h>                /* For the -ENODEV/... values */
  31 #include <linux/kernel.h>               /* For printk/panic/... */
  32 #include <linux/init.h>                 /* For __init/__exit/... */
  33 #include <linux/ioport.h>               /* For io-port access */
  34 #include <linux/io.h>                   /* For inb/outb/... */
  35
  36 #include "iTCO_vendor.h"
  37
  38 /* iTCO defines */
  39 #define SMI_EN          acpibase + 0x30 /* SMI Control and Enable Register */
  40 #define TCOBASE         acpibase + 0x60 /* TCO base address */
  41 #define TCO1_STS        TCOBASE + 0x04  /* TCO1 Status Register */
  42
  43 /* List of vendor support modes */
  44 /* SuperMicro Pentium 3 Era 370SSE+-OEM1/P3TSSE */
  45 #define SUPERMICRO_OLD_BOARD    1
  46 /* SuperMicro Pentium 4 / Xeon 4 / EMT64T Era Systems */
  47 #define SUPERMICRO_NEW_BOARD    2
  48
  49 static int vendorsupport;
  50 module_param(vendorsupport, int, 0);
  51 MODULE_PARM_DESC(vendorsupport, "iTCO vendor specific support mode, default=0 (none), 1=SuperMicro Pent3, 2=SuperMicro Pent4+");
  52
  53 /*
  54  *      Vendor Specific Support
  55  */
  56
  57 /*
  58  *      Vendor Support: 1
  59  *      Board: Super Micro Computer Inc. 370SSE+-OEM1/P3TSSE
  60  *      iTCO chipset: ICH2
  61  *
  62  *      Code contributed by: R. Seretny <lkpatches@paypc.com>
  63  *      Documentation obtained by R. Seretny from SuperMicro Technical Support
  64  *
  65  *      To enable Watchdog function:
  66  *          BIOS setup -> Power -> TCO Logic SMI Enable -> Within5Minutes
  67  *          This setting enables SMI to clear the watchdog expired flag.
  68  *          If BIOS or CPU fail which may cause SMI hang, then system will
  69  *          reboot. When application starts to use watchdog function,
  70  *          application has to take over the control from SMI.
  71  *
  72  *          For P3TSSE, J36 jumper needs to be removed to enable the Watchdog
  73  *          function.
  74  *
  75  *          Note: The system will reboot when Expire Flag is set TWICE.
  76  *          So, if the watchdog timer is 20 seconds, then the maximum hang
  77  *          time is about 40 seconds, and the minimum hang time is about
  78  *          20.6 seconds.
  79  */
  80
  81 static void supermicro_old_pre_start(unsigned long acpibase)
  82 {
  83         unsigned long val32;
  84
  85         val32 = inl(SMI_EN);
  86         val32 &= 0xffffdfff;    /* Turn off SMI clearing watchdog */
  87         outl(val32, SMI_EN);    /* Needed to activate watchdog */
  88 }
  89
  90 static void supermicro_old_pre_stop(unsigned long acpibase)
  91 {
  92         unsigned long val32;
  93
  94         val32 = inl(SMI_EN);
  95         val32 &= 0x00002000;    /* Turn on SMI clearing watchdog */
  96         outl(val32, SMI_EN);    /* Needed to deactivate watchdog */
  97 }
  98
  99 static void supermicro_old_pre_keepalive(unsigned long acpibase)
 100 {
 101         /* Reload TCO Timer (done in iTCO_wdt_keepalive) + */
 102         /* Clear "Expire Flag" (Bit 3 of TC01_STS register) */
 103         outb(0x08, TCO1_STS);
 104 }
 105
 106 /*
 107  *      Vendor Support: 2
 108  *      Board: Super Micro Computer Inc. P4SBx, P4DPx
 109  *      iTCO chipset: ICH4
 110  *
 111  *      Code contributed by: R. Seretny <lkpatches@paypc.com>
 112  *      Documentation obtained by R. Seretny from SuperMicro Technical Support
 113  *
 114  *      To enable Watchdog function:
 115  *       1. BIOS
 116  *        For P4SBx:
 117  *        BIOS setup -> Advanced -> Integrated Peripherals -> Watch Dog Feature
 118  *        For P4DPx:
 119  *        BIOS setup -> Advanced -> I/O Device Configuration -> Watch Dog
 120  *       This setting enables or disables Watchdog function. When enabled, the
 121  *       default watchdog timer is set to be 5 minutes (about 4m35s). It is
 122  *       enough to load and run the OS. The application (service or driver) has
 123  *       to take over the control once OS is running up and before watchdog
 124  *       expires.
 125  *
 126  *       2. JUMPER
 127  *        For P4SBx: JP39
 128  *        For P4DPx: JP37
 129  *        This jumper is used for safety.  Closed is enabled. This jumper
 130  *        prevents user enables watchdog in BIOS by accident.
 131  *
 132  *       To enable Watch Dog function, both BIOS and JUMPER must be enabled.
 133  *
 134  *      The documentation lists motherboards P4SBx and P4DPx series as of
 135  *      20-March-2002. However, this code works flawlessly with much newer
 136  *      motherboards, such as my X6DHR-8G2 (SuperServer 6014H-82).
 137  *
 138  *      The original iTCO driver as written does not actually reset the
 139  *      watchdog timer on these machines, as a result they reboot after five
 140  *      minutes.
 141  *
 142  *      NOTE: You may leave the Watchdog function disabled in the SuperMicro
 143  *      BIOS to avoid a "boot-race"... This driver will enable watchdog
 144  *      functionality even if it's disabled in the BIOS once the /dev/watchdog
 145  *      file is opened.
 146  */
 147
 148 /* I/O Port's */
 149 #define SM_REGINDEX     0x2e    /* SuperMicro ICH4+ Register Index */
 150 #define SM_DATAIO       0x2f    /* SuperMicro ICH4+ Register Data I/O */
 151
 152 /* Control Register's */
 153 #define SM_CTLPAGESW    0x07    /* SuperMicro ICH4+ Control Page Switch */
 154 #define SM_CTLPAGE      0x08    /* SuperMicro ICH4+ Control Page Num */
 155
 156 #define SM_WATCHENABLE  0x30    /* Watchdog enable: Bit 0: 0=off, 1=on */
 157
 158 #define SM_WATCHPAGE    0x87    /* Watchdog unlock control page */
 159
 160 #define SM_ENDWATCH     0xAA    /* Watchdog lock control page */
 161
 162 #define SM_COUNTMODE    0xf5    /* Watchdog count mode select */
 163                                 /* (Bit 3: 0 = seconds, 1 = minutes */
 164
 165 #define SM_WATCHTIMER   0xf6    /* 8-bits, Watchdog timer counter (RW) */
 166
 167 #define SM_RESETCONTROL 0xf7    /* Watchdog reset control */
 168                                 /* Bit 6: timer is reset by kbd interrupt */
 169                                 /* Bit 7: timer is reset by mouse interrupt */
 170
 171 static void supermicro_new_unlock_watchdog(void)
 172 {
 173         /* Write 0x87 to port 0x2e twice */
 174         outb(SM_WATCHPAGE, SM_REGINDEX);
 175         outb(SM_WATCHPAGE, SM_REGINDEX);
 176         /* Switch to watchdog control page */
 177         outb(SM_CTLPAGESW, SM_REGINDEX);
 178         outb(SM_CTLPAGE, SM_DATAIO);
 179 }
 180
 181 static void supermicro_new_lock_watchdog(void)
 182 {
 183         outb(SM_ENDWATCH, SM_REGINDEX);
 184 }
 185
 186 static void supermicro_new_pre_start(unsigned int heartbeat)
 187 {
 188         unsigned int val;
 189
 190         supermicro_new_unlock_watchdog();
 191
 192         /* Watchdog timer setting needs to be in seconds*/
 193         outb(SM_COUNTMODE, SM_REGINDEX);
 194         val = inb(SM_DATAIO);
 195         val &= 0xF7;
 196         outb(val, SM_DATAIO);
 197
 198         /* Write heartbeat interval to WDOG */
 199         outb(SM_WATCHTIMER, SM_REGINDEX);
 200         outb((heartbeat & 255), SM_DATAIO);
 201
 202         /* Make sure keyboard/mouse interrupts don't interfere */
 203         outb(SM_RESETCONTROL, SM_REGINDEX);
 204         val = inb(SM_DATAIO);
 205         val &= 0x3f;
 206         outb(val, SM_DATAIO);
 207
 208         /* enable watchdog by setting bit 0 of Watchdog Enable to 1 */
 209         outb(SM_WATCHENABLE, SM_REGINDEX);
 210         val = inb(SM_DATAIO);
 211         val |= 0x01;
 212         outb(val, SM_DATAIO);
 213
 214         supermicro_new_lock_watchdog();
 215 }
 216
 217 static void supermicro_new_pre_stop(void)
 218 {
 219         unsigned int val;
 220
 221         supermicro_new_unlock_watchdog();
 222
 223         /* disable watchdog by setting bit 0 of Watchdog Enable to 0 */
 224         outb(SM_WATCHENABLE, SM_REGINDEX);
 225         val = inb(SM_DATAIO);
 226         val &= 0xFE;
 227         outb(val, SM_DATAIO);
 228
 229         supermicro_new_lock_watchdog();
 230 }
 231
 232 static void supermicro_new_pre_set_heartbeat(unsigned int heartbeat)
 233 {
 234         supermicro_new_unlock_watchdog();
 235
 236         /* reset watchdog timeout to heartveat value */
 237         outb(SM_WATCHTIMER, SM_REGINDEX);
 238         outb((heartbeat & 255), SM_DATAIO);
 239
 240         supermicro_new_lock_watchdog();
 241 }
 242
 243 /*
 244  *      Generic Support Functions
 245  */
 246
 247 void iTCO_vendor_pre_start(unsigned long acpibase,
 248                            unsigned int heartbeat)
 249 {
 250         if (vendorsupport == SUPERMICRO_OLD_BOARD)
 251                 supermicro_old_pre_start(acpibase);
 252         else if (vendorsupport == SUPERMICRO_NEW_BOARD)
 253                 supermicro_new_pre_start(heartbeat);
 254 }
 255 EXPORT_SYMBOL(iTCO_vendor_pre_start);
 256
 257 void iTCO_vendor_pre_stop(unsigned long acpibase)
 258 {
 259         if (vendorsupport == SUPERMICRO_OLD_BOARD)
 260                 supermicro_old_pre_stop(acpibase);
 261         else if (vendorsupport == SUPERMICRO_NEW_BOARD)
 262                 supermicro_new_pre_stop();
 263 }
 264 EXPORT_SYMBOL(iTCO_vendor_pre_stop);
 265
 266 void iTCO_vendor_pre_keepalive(unsigned long acpibase, unsigned int heartbeat)
 267 {
 268         if (vendorsupport == SUPERMICRO_OLD_BOARD)
 269                 supermicro_old_pre_keepalive(acpibase);
 270         else if (vendorsupport == SUPERMICRO_NEW_BOARD)
 271                 supermicro_new_pre_set_heartbeat(heartbeat);
 272 }
 273 EXPORT_SYMBOL(iTCO_vendor_pre_keepalive);
 274
 275 void iTCO_vendor_pre_set_heartbeat(unsigned int heartbeat)
 276 {
 277         if (vendorsupport == SUPERMICRO_NEW_BOARD)
 278                 supermicro_new_pre_set_heartbeat(heartbeat);
 279 }
 280 EXPORT_SYMBOL(iTCO_vendor_pre_set_heartbeat);
 281
 282 int iTCO_vendor_check_noreboot_on(void)
 283 {
 284         switch (vendorsupport) {
 285         case SUPERMICRO_OLD_BOARD:
 286                 return 0;
 287         default:
 288                 return 1;
 289         }
 290 }
 291 EXPORT_SYMBOL(iTCO_vendor_check_noreboot_on);
 292
 293 static int __init iTCO_vendor_init_module(void)
 294 {
 295         printk(KERN_INFO PFX "vendor-support=%d\n", vendorsupport);
 296         return 0;
 297 }
 298
 299 static void __exit iTCO_vendor_exit_module(void)
 300 {
 301         printk(KERN_INFO PFX "Module Unloaded\n");
 302 }
 303
 304 module_init(iTCO_vendor_init_module);
 305 module_exit(iTCO_vendor_exit_module);
 306
 307 MODULE_AUTHOR("Wim Van Sebroeck <wim@iguana.be>, R. Seretny <lkpatches@paypc.com>");
 308 MODULE_DESCRIPTION("Intel TCO Vendor Specific WatchDog Timer Driver Support");
 309 MODULE_VERSION(DRV_VERSION);
 310 MODULE_LICENSE("GPL");
 311