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