drivers/watchdog/iTCO_wdt.c

   1 /*
   2  *      intel TCO Watchdog Driver
   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  *      The TCO watchdog is implemented in the following I/O controller hubs:
  16  *      (See the intel documentation on http://developer.intel.com.)
  17  *      document number 290655-003, 290677-014: 82801AA (ICH), 82801AB (ICHO)
  18  *      document number 290687-002, 298242-027: 82801BA (ICH2)
  19  *      document number 290733-003, 290739-013: 82801CA (ICH3-S)
  20  *      document number 290716-001, 290718-007: 82801CAM (ICH3-M)
  21  *      document number 290744-001, 290745-025: 82801DB (ICH4)
  22  *      document number 252337-001, 252663-008: 82801DBM (ICH4-M)
  23  *      document number 273599-001, 273645-002: 82801E (C-ICH)
  24  *      document number 252516-001, 252517-028: 82801EB (ICH5), 82801ER (ICH5R)
  25  *      document number 300641-004, 300884-013: 6300ESB
  26  *      document number 301473-002, 301474-026: 82801F (ICH6)
  27  *      document number 313082-001, 313075-006: 631xESB, 632xESB
  28  *      document number 307013-003, 307014-024: 82801G (ICH7)
  29  *      document number 313056-003, 313057-017: 82801H (ICH8)
  30  *      document number 316972-004, 316973-012: 82801I (ICH9)
  31  *      document number 319973-002, 319974-002: 82801J (ICH10)
  32  *      document number 322169-001, 322170-003: 5 Series, 3400 Series (PCH)
  33  *      document number 320066-003, 320257-008: EP80597 (IICH)
  34  *      document number TBD                   : Cougar Point (CPT)
  35  *      document number TBD                   : Patsburg (PBG)
  36  */
  37
  38 /*
  39  *      Includes, defines, variables, module parameters, ...
  40  */
  41
  42 /* Module and version information */
  43 #define DRV_NAME        "iTCO_wdt"
  44 #define DRV_VERSION     "1.06"
  45 #define PFX             DRV_NAME ": "
  46
  47 /* Includes */
  48 #include <linux/module.h>               /* For module specific items */
  49 #include <linux/moduleparam.h>          /* For new moduleparam's */
  50 #include <linux/types.h>                /* For standard types (like size_t) */
  51 #include <linux/errno.h>                /* For the -ENODEV/... values */
  52 #include <linux/kernel.h>               /* For printk/panic/... */
  53 #include <linux/miscdevice.h>           /* For MODULE_ALIAS_MISCDEV
  54                                                         (WATCHDOG_MINOR) */
  55 #include <linux/watchdog.h>             /* For the watchdog specific items */
  56 #include <linux/init.h>                 /* For __init/__exit/... */
  57 #include <linux/fs.h>                   /* For file operations */
  58 #include <linux/platform_device.h>      /* For platform_driver framework */
  59 #include <linux/pci.h>                  /* For pci functions */
  60 #include <linux/ioport.h>               /* For io-port access */
  61 #include <linux/spinlock.h>             /* For spin_lock/spin_unlock/... */
  62 #include <linux/uaccess.h>              /* For copy_to_user/put_user/... */
  63 #include <linux/io.h>                   /* For inb/outb/... */
  64
  65 #include "iTCO_vendor.h"
  66
  67 /* TCO related info */
  68 enum iTCO_chipsets {
  69         TCO_ICH = 0,    /* ICH */
  70         TCO_ICH0,       /* ICH0 */
  71         TCO_ICH2,       /* ICH2 */
  72         TCO_ICH2M,      /* ICH2-M */
  73         TCO_ICH3,       /* ICH3-S */
  74         TCO_ICH3M,      /* ICH3-M */
  75         TCO_ICH4,       /* ICH4 */
  76         TCO_ICH4M,      /* ICH4-M */
  77         TCO_CICH,       /* C-ICH */
  78         TCO_ICH5,       /* ICH5 & ICH5R */
  79         TCO_6300ESB,    /* 6300ESB */
  80         TCO_ICH6,       /* ICH6 & ICH6R */
  81         TCO_ICH6M,      /* ICH6-M */
  82         TCO_ICH6W,      /* ICH6W & ICH6RW */
  83         TCO_631XESB,    /* 631xESB/632xESB */
  84         TCO_ICH7,       /* ICH7 & ICH7R */
  85         TCO_ICH7DH,     /* ICH7DH */
  86         TCO_ICH7M,      /* ICH7-M & ICH7-U */
  87         TCO_ICH7MDH,    /* ICH7-M DH */
  88         TCO_ICH8,       /* ICH8 & ICH8R */
  89         TCO_ICH8DH,     /* ICH8DH */
  90         TCO_ICH8DO,     /* ICH8DO */
  91         TCO_ICH8M,      /* ICH8M */
  92         TCO_ICH8ME,     /* ICH8M-E */
  93         TCO_ICH9,       /* ICH9 */
  94         TCO_ICH9R,      /* ICH9R */
  95         TCO_ICH9DH,     /* ICH9DH */
  96         TCO_ICH9DO,     /* ICH9DO */
  97         TCO_ICH9M,      /* ICH9M */
  98         TCO_ICH9ME,     /* ICH9M-E */
  99         TCO_ICH10,      /* ICH10 */
 100         TCO_ICH10R,     /* ICH10R */
 101         TCO_ICH10D,     /* ICH10D */
 102         TCO_ICH10DO,    /* ICH10DO */
 103         TCO_PCH,        /* PCH Desktop Full Featured */
 104         TCO_PCHM,       /* PCH Mobile Full Featured */
 105         TCO_P55,        /* P55 */
 106         TCO_PM55,       /* PM55 */
 107         TCO_H55,        /* H55 */
 108         TCO_QM57,       /* QM57 */
 109         TCO_H57,        /* H57 */
 110         TCO_HM55,       /* HM55 */
 111         TCO_Q57,        /* Q57 */
 112         TCO_HM57,       /* HM57 */
 113         TCO_PCHMSFF,    /* PCH Mobile SFF Full Featured */
 114         TCO_QS57,       /* QS57 */
 115         TCO_3400,       /* 3400 */
 116         TCO_3420,       /* 3420 */
 117         TCO_3450,       /* 3450 */
 118         TCO_EP80579,    /* EP80579 */
 119         TCO_CPT1,       /* Cougar Point */
 120         TCO_CPT2,       /* Cougar Point Desktop */
 121         TCO_CPT3,       /* Cougar Point Mobile */
 122         TCO_CPT4,       /* Cougar Point */
 123         TCO_CPT5,       /* Cougar Point */
 124         TCO_CPT6,       /* Cougar Point */
 125         TCO_CPT7,       /* Cougar Point */
 126         TCO_CPT8,       /* Cougar Point */
 127         TCO_CPT9,       /* Cougar Point */
 128         TCO_CPT10,      /* Cougar Point */
 129         TCO_CPT11,      /* Cougar Point */
 130         TCO_CPT12,      /* Cougar Point */
 131         TCO_CPT13,      /* Cougar Point */
 132         TCO_CPT14,      /* Cougar Point */
 133         TCO_CPT15,      /* Cougar Point */
 134         TCO_CPT16,      /* Cougar Point */
 135         TCO_CPT17,      /* Cougar Point */
 136         TCO_CPT18,      /* Cougar Point */
 137         TCO_CPT19,      /* Cougar Point */
 138         TCO_CPT20,      /* Cougar Point */
 139         TCO_CPT21,      /* Cougar Point */
 140         TCO_CPT22,      /* Cougar Point */
 141         TCO_CPT23,      /* Cougar Point */
 142         TCO_CPT24,      /* Cougar Point */
 143         TCO_CPT25,      /* Cougar Point */
 144         TCO_CPT26,      /* Cougar Point */
 145         TCO_CPT27,      /* Cougar Point */
 146         TCO_CPT28,      /* Cougar Point */
 147         TCO_CPT29,      /* Cougar Point */
 148         TCO_CPT30,      /* Cougar Point */
 149         TCO_CPT31,      /* Cougar Point */
 150         TCO_PBG1,       /* Patsburg */
 151         TCO_PBG2,       /* Patsburg */
 152 };
 153
 154 static struct {
 155         char *name;
 156         unsigned int iTCO_version;
 157 } iTCO_chipset_info[] __devinitdata = {
 158         {"ICH", 1},
 159         {"ICH0", 1},
 160         {"ICH2", 1},
 161         {"ICH2-M", 1},
 162         {"ICH3-S", 1},
 163         {"ICH3-M", 1},
 164         {"ICH4", 1},
 165         {"ICH4-M", 1},
 166         {"C-ICH", 1},
 167         {"ICH5 or ICH5R", 1},
 168         {"6300ESB", 1},
 169         {"ICH6 or ICH6R", 2},
 170         {"ICH6-M", 2},
 171         {"ICH6W or ICH6RW", 2},
 172         {"631xESB/632xESB", 2},
 173         {"ICH7 or ICH7R", 2},
 174         {"ICH7DH", 2},
 175         {"ICH7-M or ICH7-U", 2},
 176         {"ICH7-M DH", 2},
 177         {"ICH8 or ICH8R", 2},
 178         {"ICH8DH", 2},
 179         {"ICH8DO", 2},
 180         {"ICH8M", 2},
 181         {"ICH8M-E", 2},
 182         {"ICH9", 2},
 183         {"ICH9R", 2},
 184         {"ICH9DH", 2},
 185         {"ICH9DO", 2},
 186         {"ICH9M", 2},
 187         {"ICH9M-E", 2},
 188         {"ICH10", 2},
 189         {"ICH10R", 2},
 190         {"ICH10D", 2},
 191         {"ICH10DO", 2},
 192         {"PCH Desktop Full Featured", 2},
 193         {"PCH Mobile Full Featured", 2},
 194         {"P55", 2},
 195         {"PM55", 2},
 196         {"H55", 2},
 197         {"QM57", 2},
 198         {"H57", 2},
 199         {"HM55", 2},
 200         {"Q57", 2},
 201         {"HM57", 2},
 202         {"PCH Mobile SFF Full Featured", 2},
 203         {"QS57", 2},
 204         {"3400", 2},
 205         {"3420", 2},
 206         {"3450", 2},
 207         {"EP80579", 2},
 208         {"Cougar Point", 2},
 209         {"Cougar Point", 2},
 210         {"Cougar Point", 2},
 211         {"Cougar Point", 2},
 212         {"Cougar Point", 2},
 213         {"Cougar Point", 2},
 214         {"Cougar Point", 2},
 215         {"Cougar Point", 2},
 216         {"Cougar Point", 2},
 217         {"Cougar Point", 2},
 218         {"Cougar Point", 2},
 219         {"Cougar Point", 2},
 220         {"Cougar Point", 2},
 221         {"Cougar Point", 2},
 222         {"Cougar Point", 2},
 223         {"Cougar Point", 2},
 224         {"Cougar Point", 2},
 225         {"Cougar Point", 2},
 226         {"Cougar Point", 2},
 227         {"Cougar Point", 2},
 228         {"Cougar Point", 2},
 229         {"Cougar Point", 2},
 230         {"Cougar Point", 2},
 231         {"Cougar Point", 2},
 232         {"Cougar Point", 2},
 233         {"Cougar Point", 2},
 234         {"Cougar Point", 2},
 235         {"Cougar Point", 2},
 236         {"Cougar Point", 2},
 237         {"Cougar Point", 2},
 238         {"Cougar Point", 2},
 239         {"Patsburg", 2},
 240         {"Patsburg", 2},
 241         {NULL, 0}
 242 };
 243
 244 #define ITCO_PCI_DEVICE(dev, data)      \
 245         .vendor = PCI_VENDOR_ID_INTEL,  \
 246         .device = dev,                  \
 247         .subvendor = PCI_ANY_ID,        \
 248         .subdevice = PCI_ANY_ID,        \
 249         .class = 0,                     \
 250         .class_mask = 0,                \
 251         .driver_data = data
 252
 253 /*
 254  * This data only exists for exporting the supported PCI ids
 255  * via MODULE_DEVICE_TABLE.  We do not actually register a
 256  * pci_driver, because the I/O Controller Hub has also other
 257  * functions that probably will be registered by other drivers.
 258  */
 259 static struct pci_device_id iTCO_wdt_pci_tbl[] = {
 260         { ITCO_PCI_DEVICE(PCI_DEVICE_ID_INTEL_82801AA_0,        TCO_ICH)},
 261         { ITCO_PCI_DEVICE(PCI_DEVICE_ID_INTEL_82801AB_0,        TCO_ICH0)},
 262         { ITCO_PCI_DEVICE(PCI_DEVICE_ID_INTEL_82801BA_0,        TCO_ICH2)},
 263         { ITCO_PCI_DEVICE(PCI_DEVICE_ID_INTEL_82801BA_10,       TCO_ICH2M)},
 264         { ITCO_PCI_DEVICE(PCI_DEVICE_ID_INTEL_82801CA_0,        TCO_ICH3)},
 265         { ITCO_PCI_DEVICE(PCI_DEVICE_ID_INTEL_82801CA_12,       TCO_ICH3M)},
 266         { ITCO_PCI_DEVICE(PCI_DEVICE_ID_INTEL_82801DB_0,        TCO_ICH4)},
 267         { ITCO_PCI_DEVICE(PCI_DEVICE_ID_INTEL_82801DB_12,       TCO_ICH4M)},
 268         { ITCO_PCI_DEVICE(PCI_DEVICE_ID_INTEL_82801E_0,         TCO_CICH)},
 269         { ITCO_PCI_DEVICE(PCI_DEVICE_ID_INTEL_82801EB_0,        TCO_ICH5)},
 270         { ITCO_PCI_DEVICE(PCI_DEVICE_ID_INTEL_ESB_1,            TCO_6300ESB)},
 271         { ITCO_PCI_DEVICE(PCI_DEVICE_ID_INTEL_ICH6_0,           TCO_ICH6)},
 272         { ITCO_PCI_DEVICE(PCI_DEVICE_ID_INTEL_ICH6_1,           TCO_ICH6M)},
 273         { ITCO_PCI_DEVICE(PCI_DEVICE_ID_INTEL_ICH6_2,           TCO_ICH6W)},
 274         { ITCO_PCI_DEVICE(PCI_DEVICE_ID_INTEL_ESB2_0,           TCO_631XESB)},
 275         { ITCO_PCI_DEVICE(0x2671,                               TCO_631XESB)},
 276         { ITCO_PCI_DEVICE(0x2672,                               TCO_631XESB)},
 277         { ITCO_PCI_DEVICE(0x2673,                               TCO_631XESB)},
 278         { ITCO_PCI_DEVICE(0x2674,                               TCO_631XESB)},
 279         { ITCO_PCI_DEVICE(0x2675,                               TCO_631XESB)},
 280         { ITCO_PCI_DEVICE(0x2676,                               TCO_631XESB)},
 281         { ITCO_PCI_DEVICE(0x2677,                               TCO_631XESB)},
 282         { ITCO_PCI_DEVICE(0x2678,                               TCO_631XESB)},
 283         { ITCO_PCI_DEVICE(0x2679,                               TCO_631XESB)},
 284         { ITCO_PCI_DEVICE(0x267a,                               TCO_631XESB)},
 285         { ITCO_PCI_DEVICE(0x267b,                               TCO_631XESB)},
 286         { ITCO_PCI_DEVICE(0x267c,                               TCO_631XESB)},
 287         { ITCO_PCI_DEVICE(0x267d,                               TCO_631XESB)},
 288         { ITCO_PCI_DEVICE(0x267e,                               TCO_631XESB)},
 289         { ITCO_PCI_DEVICE(0x267f,                               TCO_631XESB)},
 290         { ITCO_PCI_DEVICE(PCI_DEVICE_ID_INTEL_ICH7_0,           TCO_ICH7)},
 291         { ITCO_PCI_DEVICE(PCI_DEVICE_ID_INTEL_ICH7_30,          TCO_ICH7DH)},
 292         { ITCO_PCI_DEVICE(PCI_DEVICE_ID_INTEL_ICH7_1,           TCO_ICH7M)},
 293         { ITCO_PCI_DEVICE(PCI_DEVICE_ID_INTEL_ICH7_31,          TCO_ICH7MDH)},
 294         { ITCO_PCI_DEVICE(PCI_DEVICE_ID_INTEL_ICH8_0,           TCO_ICH8)},
 295         { ITCO_PCI_DEVICE(PCI_DEVICE_ID_INTEL_ICH8_2,           TCO_ICH8DH)},
 296         { ITCO_PCI_DEVICE(PCI_DEVICE_ID_INTEL_ICH8_3,           TCO_ICH8DO)},
 297         { ITCO_PCI_DEVICE(PCI_DEVICE_ID_INTEL_ICH8_4,           TCO_ICH8M)},
 298         { ITCO_PCI_DEVICE(PCI_DEVICE_ID_INTEL_ICH8_1,           TCO_ICH8ME)},
 299         { ITCO_PCI_DEVICE(0x2918,                               TCO_ICH9)},
 300         { ITCO_PCI_DEVICE(0x2916,                               TCO_ICH9R)},
 301         { ITCO_PCI_DEVICE(PCI_DEVICE_ID_INTEL_ICH9_2,           TCO_ICH9DH)},
 302         { ITCO_PCI_DEVICE(PCI_DEVICE_ID_INTEL_ICH9_4,           TCO_ICH9DO)},
 303         { ITCO_PCI_DEVICE(0x2919,                               TCO_ICH9M)},
 304         { ITCO_PCI_DEVICE(0x2917,                               TCO_ICH9ME)},
 305         { ITCO_PCI_DEVICE(0x3a18,                               TCO_ICH10)},
 306         { ITCO_PCI_DEVICE(0x3a16,                               TCO_ICH10R)},
 307         { ITCO_PCI_DEVICE(0x3a1a,                               TCO_ICH10D)},
 308         { ITCO_PCI_DEVICE(0x3a14,                               TCO_ICH10DO)},
 309         { ITCO_PCI_DEVICE(0x3b00,                               TCO_PCH)},
 310         { ITCO_PCI_DEVICE(0x3b01,                               TCO_PCHM)},
 311         { ITCO_PCI_DEVICE(0x3b02,                               TCO_P55)},
 312         { ITCO_PCI_DEVICE(0x3b03,                               TCO_PM55)},
 313         { ITCO_PCI_DEVICE(0x3b06,                               TCO_H55)},
 314         { ITCO_PCI_DEVICE(0x3b07,                               TCO_QM57)},
 315         { ITCO_PCI_DEVICE(0x3b08,                               TCO_H57)},
 316         { ITCO_PCI_DEVICE(0x3b09,                               TCO_HM55)},
 317         { ITCO_PCI_DEVICE(0x3b0a,                               TCO_Q57)},
 318         { ITCO_PCI_DEVICE(0x3b0b,                               TCO_HM57)},
 319         { ITCO_PCI_DEVICE(0x3b0d,                               TCO_PCHMSFF)},
 320         { ITCO_PCI_DEVICE(0x3b0f,                               TCO_QS57)},
 321         { ITCO_PCI_DEVICE(0x3b12,                               TCO_3400)},
 322         { ITCO_PCI_DEVICE(0x3b14,                               TCO_3420)},
 323         { ITCO_PCI_DEVICE(0x3b16,                               TCO_3450)},
 324         { ITCO_PCI_DEVICE(0x5031,                               TCO_EP80579)},
 325         { ITCO_PCI_DEVICE(0x1c41,                               TCO_CPT1)},
 326         { ITCO_PCI_DEVICE(0x1c42,                               TCO_CPT2)},
 327         { ITCO_PCI_DEVICE(0x1c43,                               TCO_CPT3)},
 328         { ITCO_PCI_DEVICE(0x1c44,                               TCO_CPT4)},
 329         { ITCO_PCI_DEVICE(0x1c45,                               TCO_CPT5)},
 330         { ITCO_PCI_DEVICE(0x1c46,                               TCO_CPT6)},
 331         { ITCO_PCI_DEVICE(0x1c47,                               TCO_CPT7)},
 332         { ITCO_PCI_DEVICE(0x1c48,                               TCO_CPT8)},
 333         { ITCO_PCI_DEVICE(0x1c49,                               TCO_CPT9)},
 334         { ITCO_PCI_DEVICE(0x1c4a,                               TCO_CPT10)},
 335         { ITCO_PCI_DEVICE(0x1c4b,                               TCO_CPT11)},
 336         { ITCO_PCI_DEVICE(0x1c4c,                               TCO_CPT12)},
 337         { ITCO_PCI_DEVICE(0x1c4d,                               TCO_CPT13)},
 338         { ITCO_PCI_DEVICE(0x1c4e,                               TCO_CPT14)},
 339         { ITCO_PCI_DEVICE(0x1c4f,                               TCO_CPT15)},
 340         { ITCO_PCI_DEVICE(0x1c50,                               TCO_CPT16)},
 341         { ITCO_PCI_DEVICE(0x1c51,                               TCO_CPT17)},
 342         { ITCO_PCI_DEVICE(0x1c52,                               TCO_CPT18)},
 343         { ITCO_PCI_DEVICE(0x1c53,                               TCO_CPT19)},
 344         { ITCO_PCI_DEVICE(0x1c54,                               TCO_CPT20)},
 345         { ITCO_PCI_DEVICE(0x1c55,                               TCO_CPT21)},
 346         { ITCO_PCI_DEVICE(0x1c56,                               TCO_CPT22)},
 347         { ITCO_PCI_DEVICE(0x1c57,                               TCO_CPT23)},
 348         { ITCO_PCI_DEVICE(0x1c58,                               TCO_CPT24)},
 349         { ITCO_PCI_DEVICE(0x1c59,                               TCO_CPT25)},
 350         { ITCO_PCI_DEVICE(0x1c5a,                               TCO_CPT26)},
 351         { ITCO_PCI_DEVICE(0x1c5b,                               TCO_CPT27)},
 352         { ITCO_PCI_DEVICE(0x1c5c,                               TCO_CPT28)},
 353         { ITCO_PCI_DEVICE(0x1c5d,                               TCO_CPT29)},
 354         { ITCO_PCI_DEVICE(0x1c5e,                               TCO_CPT30)},
 355         { ITCO_PCI_DEVICE(0x1c5f,                               TCO_CPT31)},
 356         { ITCO_PCI_DEVICE(0x1d40,                               TCO_PBG1)},
 357         { ITCO_PCI_DEVICE(0x1d41,                               TCO_PBG2)},
 358         { 0, },                 /* End of list */
 359 };
 360 MODULE_DEVICE_TABLE(pci, iTCO_wdt_pci_tbl);
 361
 362 /* Address definitions for the TCO */
 363 /* TCO base address */
 364 #define TCOBASE         (iTCO_wdt_private.ACPIBASE + 0x60)
 365 /* SMI Control and Enable Register */
 366 #define SMI_EN          (iTCO_wdt_private.ACPIBASE + 0x30)
 367
 368 #define TCO_RLD         (TCOBASE + 0x00) /* TCO Timer Reload and Curr. Value */
 369 #define TCOv1_TMR       (TCOBASE + 0x01) /* TCOv1 Timer Initial Value   */
 370 #define TCO_DAT_IN      (TCOBASE + 0x02) /* TCO Data In Register        */
 371 #define TCO_DAT_OUT     (TCOBASE + 0x03) /* TCO Data Out Register       */
 372 #define TCO1_STS        (TCOBASE + 0x04) /* TCO1 Status Register        */
 373 #define TCO2_STS        (TCOBASE + 0x06) /* TCO2 Status Register        */
 374 #define TCO1_CNT        (TCOBASE + 0x08) /* TCO1 Control Register       */
 375 #define TCO2_CNT        (TCOBASE + 0x0a) /* TCO2 Control Register       */
 376 #define TCOv2_TMR       (TCOBASE + 0x12) /* TCOv2 Timer Initial Value   */
 377
 378 /* internal variables */
 379 static unsigned long is_active;
 380 static char expect_release;
 381 static struct {         /* this is private data for the iTCO_wdt device */
 382         /* TCO version/generation */
 383         unsigned int iTCO_version;
 384         /* The device's ACPIBASE address (TCOBASE = ACPIBASE+0x60) */
 385         unsigned long ACPIBASE;
 386         /* NO_REBOOT flag is Memory-Mapped GCS register bit 5 (TCO version 2)*/
 387         unsigned long __iomem *gcs;
 388         /* the lock for io operations */
 389         spinlock_t io_lock;
 390         /* the PCI-device */
 391         struct pci_dev *pdev;
 392 } iTCO_wdt_private;
 393
 394 /* the watchdog platform device */
 395 static struct platform_device *iTCO_wdt_platform_device;
 396
 397 /* module parameters */
 398 #define WATCHDOG_HEARTBEAT 30   /* 30 sec default heartbeat */
 399 static int heartbeat = WATCHDOG_HEARTBEAT;  /* in seconds */
 400 module_param(heartbeat, int, 0);
 401 MODULE_PARM_DESC(heartbeat, "Watchdog timeout in seconds. "
 402         "5..76 (TCO v1) or 3..614 (TCO v2), default="
 403                                 __MODULE_STRING(WATCHDOG_HEARTBEAT) ")");
 404
 405 static int nowayout = WATCHDOG_NOWAYOUT;
 406 module_param(nowayout, int, 0);
 407 MODULE_PARM_DESC(nowayout,
 408         "Watchdog cannot be stopped once started (default="
 409                                 __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
 410
 411 /*
 412  * Some TCO specific functions
 413  */
 414
 415 static inline unsigned int seconds_to_ticks(int seconds)
 416 {
 417         /* the internal timer is stored as ticks which decrement
 418          * every 0.6 seconds */
 419         return (seconds * 10) / 6;
 420 }
 421
 422 static void iTCO_wdt_set_NO_REBOOT_bit(void)
 423 {
 424         u32 val32;
 425
 426         /* Set the NO_REBOOT bit: this disables reboots */
 427         if (iTCO_wdt_private.iTCO_version == 2) {
 428                 val32 = readl(iTCO_wdt_private.gcs);
 429                 val32 |= 0x00000020;
 430                 writel(val32, iTCO_wdt_private.gcs);
 431         } else if (iTCO_wdt_private.iTCO_version == 1) {
 432                 pci_read_config_dword(iTCO_wdt_private.pdev, 0xd4, &val32);
 433                 val32 |= 0x00000002;
 434                 pci_write_config_dword(iTCO_wdt_private.pdev, 0xd4, val32);
 435         }
 436 }
 437
 438 static int iTCO_wdt_unset_NO_REBOOT_bit(void)
 439 {
 440         int ret = 0;
 441         u32 val32;
 442
 443         /* Unset the NO_REBOOT bit: this enables reboots */
 444         if (iTCO_wdt_private.iTCO_version == 2) {
 445                 val32 = readl(iTCO_wdt_private.gcs);
 446                 val32 &= 0xffffffdf;
 447                 writel(val32, iTCO_wdt_private.gcs);
 448
 449                 val32 = readl(iTCO_wdt_private.gcs);
 450                 if (val32 & 0x00000020)
 451                         ret = -EIO;
 452         } else if (iTCO_wdt_private.iTCO_version == 1) {
 453                 pci_read_config_dword(iTCO_wdt_private.pdev, 0xd4, &val32);
 454                 val32 &= 0xfffffffd;
 455                 pci_write_config_dword(iTCO_wdt_private.pdev, 0xd4, val32);
 456
 457                 pci_read_config_dword(iTCO_wdt_private.pdev, 0xd4, &val32);
 458                 if (val32 & 0x00000002)
 459                         ret = -EIO;
 460         }
 461
 462         return ret; /* returns: 0 = OK, -EIO = Error */
 463 }
 464
 465 static int iTCO_wdt_start(void)
 466 {
 467         unsigned int val;
 468
 469         spin_lock(&iTCO_wdt_private.io_lock);
 470
 471         iTCO_vendor_pre_start(iTCO_wdt_private.ACPIBASE, heartbeat);
 472
 473         /* disable chipset's NO_REBOOT bit */
 474         if (iTCO_wdt_unset_NO_REBOOT_bit()) {
 475                 spin_unlock(&iTCO_wdt_private.io_lock);
 476                 printk(KERN_ERR PFX "failed to reset NO_REBOOT flag, "
 477                                         "reboot disabled by hardware/BIOS\n");
 478                 return -EIO;
 479         }
 480
 481         /* Force the timer to its reload value by writing to the TCO_RLD
 482            register */
 483         if (iTCO_wdt_private.iTCO_version == 2)
 484                 outw(0x01, TCO_RLD);
 485         else if (iTCO_wdt_private.iTCO_version == 1)
 486                 outb(0x01, TCO_RLD);
 487
 488         /* Bit 11: TCO Timer Halt -> 0 = The TCO timer is enabled to count */
 489         val = inw(TCO1_CNT);
 490         val &= 0xf7ff;
 491         outw(val, TCO1_CNT);
 492         val = inw(TCO1_CNT);
 493         spin_unlock(&iTCO_wdt_private.io_lock);
 494
 495         if (val & 0x0800)
 496                 return -1;
 497         return 0;
 498 }
 499
 500 static int iTCO_wdt_stop(void)
 501 {
 502         unsigned int val;
 503
 504         spin_lock(&iTCO_wdt_private.io_lock);
 505
 506         iTCO_vendor_pre_stop(iTCO_wdt_private.ACPIBASE);
 507
 508         /* Bit 11: TCO Timer Halt -> 1 = The TCO timer is disabled */
 509         val = inw(TCO1_CNT);
 510         val |= 0x0800;
 511         outw(val, TCO1_CNT);
 512         val = inw(TCO1_CNT);
 513
 514         /* Set the NO_REBOOT bit to prevent later reboots, just for sure */
 515         iTCO_wdt_set_NO_REBOOT_bit();
 516
 517         spin_unlock(&iTCO_wdt_private.io_lock);
 518
 519         if ((val & 0x0800) == 0)
 520                 return -1;
 521         return 0;
 522 }
 523
 524 static int iTCO_wdt_keepalive(void)
 525 {
 526         spin_lock(&iTCO_wdt_private.io_lock);
 527
 528         iTCO_vendor_pre_keepalive(iTCO_wdt_private.ACPIBASE, heartbeat);
 529
 530         /* Reload the timer by writing to the TCO Timer Counter register */
 531         if (iTCO_wdt_private.iTCO_version == 2)
 532                 outw(0x01, TCO_RLD);
 533         else if (iTCO_wdt_private.iTCO_version == 1) {
 534                 /* Reset the timeout status bit so that the timer
 535                  * needs to count down twice again before rebooting */
 536                 outw(0x0008, TCO1_STS); /* write 1 to clear bit */
 537
 538                 outb(0x01, TCO_RLD);
 539         }
 540
 541         spin_unlock(&iTCO_wdt_private.io_lock);
 542         return 0;
 543 }
 544
 545 static int iTCO_wdt_set_heartbeat(int t)
 546 {
 547         unsigned int val16;
 548         unsigned char val8;
 549         unsigned int tmrval;
 550
 551         tmrval = seconds_to_ticks(t);
 552
 553         /* For TCO v1 the timer counts down twice before rebooting */
 554         if (iTCO_wdt_private.iTCO_version == 1)
 555                 tmrval /= 2;
 556
 557         /* from the specs: */
 558         /* "Values of 0h-3h are ignored and should not be attempted" */
 559         if (tmrval < 0x04)
 560                 return -EINVAL;
 561         if (((iTCO_wdt_private.iTCO_version == 2) && (tmrval > 0x3ff)) ||
 562             ((iTCO_wdt_private.iTCO_version == 1) && (tmrval > 0x03f)))
 563                 return -EINVAL;
 564
 565         iTCO_vendor_pre_set_heartbeat(tmrval);
 566
 567         /* Write new heartbeat to watchdog */
 568         if (iTCO_wdt_private.iTCO_version == 2) {
 569                 spin_lock(&iTCO_wdt_private.io_lock);
 570                 val16 = inw(TCOv2_TMR);
 571                 val16 &= 0xfc00;
 572                 val16 |= tmrval;
 573                 outw(val16, TCOv2_TMR);
 574                 val16 = inw(TCOv2_TMR);
 575                 spin_unlock(&iTCO_wdt_private.io_lock);
 576
 577                 if ((val16 & 0x3ff) != tmrval)
 578                         return -EINVAL;
 579         } else if (iTCO_wdt_private.iTCO_version == 1) {
 580                 spin_lock(&iTCO_wdt_private.io_lock);
 581                 val8 = inb(TCOv1_TMR);
 582                 val8 &= 0xc0;
 583                 val8 |= (tmrval & 0xff);
 584                 outb(val8, TCOv1_TMR);
 585                 val8 = inb(TCOv1_TMR);
 586                 spin_unlock(&iTCO_wdt_private.io_lock);
 587
 588                 if ((val8 & 0x3f) != tmrval)
 589                         return -EINVAL;
 590         }
 591
 592         heartbeat = t;
 593         return 0;
 594 }
 595
 596 static int iTCO_wdt_get_timeleft(int *time_left)
 597 {
 598         unsigned int val16;
 599         unsigned char val8;
 600
 601         /* read the TCO Timer */
 602         if (iTCO_wdt_private.iTCO_version == 2) {
 603                 spin_lock(&iTCO_wdt_private.io_lock);
 604                 val16 = inw(TCO_RLD);
 605                 val16 &= 0x3ff;
 606                 spin_unlock(&iTCO_wdt_private.io_lock);
 607
 608                 *time_left = (val16 * 6) / 10;
 609         } else if (iTCO_wdt_private.iTCO_version == 1) {
 610                 spin_lock(&iTCO_wdt_private.io_lock);
 611                 val8 = inb(TCO_RLD);
 612                 val8 &= 0x3f;
 613                 if (!(inw(TCO1_STS) & 0x0008))
 614                         val8 += (inb(TCOv1_TMR) & 0x3f);
 615                 spin_unlock(&iTCO_wdt_private.io_lock);
 616
 617                 *time_left = (val8 * 6) / 10;
 618         } else
 619                 return -EINVAL;
 620         return 0;
 621 }
 622
 623 /*
 624  *      /dev/watchdog handling
 625  */
 626
 627 static int iTCO_wdt_open(struct inode *inode, struct file *file)
 628 {
 629         /* /dev/watchdog can only be opened once */
 630         if (test_and_set_bit(0, &is_active))
 631                 return -EBUSY;
 632
 633         /*
 634          *      Reload and activate timer
 635          */
 636         iTCO_wdt_start();
 637         return nonseekable_open(inode, file);
 638 }
 639
 640 static int iTCO_wdt_release(struct inode *inode, struct file *file)
 641 {
 642         /*
 643          *      Shut off the timer.
 644          */
 645         if (expect_release == 42) {
 646                 iTCO_wdt_stop();
 647         } else {
 648                 printk(KERN_CRIT PFX
 649                         "Unexpected close, not stopping watchdog!\n");
 650                 iTCO_wdt_keepalive();
 651         }
 652         clear_bit(0, &is_active);
 653         expect_release = 0;
 654         return 0;
 655 }
 656
 657 static ssize_t iTCO_wdt_write(struct file *file, const char __user *data,
 658                               size_t len, loff_t *ppos)
 659 {
 660         /* See if we got the magic character 'V' and reload the timer */
 661         if (len) {
 662                 if (!nowayout) {
 663                         size_t i;
 664
 665                         /* note: just in case someone wrote the magic
 666                            character five months ago... */
 667                         expect_release = 0;
 668
 669                         /* scan to see whether or not we got the
 670                            magic character */
 671                         for (i = 0; i != len; i++) {
 672                                 char c;
 673                                 if (get_user(c, data + i))
 674                                         return -EFAULT;
 675                                 if (c == 'V')
 676                                         expect_release = 42;
 677                         }
 678                 }
 679
 680                 /* someone wrote to us, we should reload the timer */
 681                 iTCO_wdt_keepalive();
 682         }
 683         return len;
 684 }
 685
 686 static long iTCO_wdt_ioctl(struct file *file, unsigned int cmd,
 687                                                         unsigned long arg)
 688 {
 689         int new_options, retval = -EINVAL;
 690         int new_heartbeat;
 691         void __user *argp = (void __user *)arg;
 692         int __user *p = argp;
 693         static const struct watchdog_info ident = {
 694                 .options =              WDIOF_SETTIMEOUT |
 695                                         WDIOF_KEEPALIVEPING |
 696                                         WDIOF_MAGICCLOSE,
 697                 .firmware_version =     0,
 698                 .identity =             DRV_NAME,
 699         };
 700
 701         switch (cmd) {
 702         case WDIOC_GETSUPPORT:
 703                 return copy_to_user(argp, &ident, sizeof(ident)) ? -EFAULT : 0;
 704         case WDIOC_GETSTATUS:
 705         case WDIOC_GETBOOTSTATUS:
 706                 return put_user(0, p);
 707
 708         case WDIOC_SETOPTIONS:
 709         {
 710                 if (get_user(new_options, p))
 711                         return -EFAULT;
 712
 713                 if (new_options & WDIOS_DISABLECARD) {
 714                         iTCO_wdt_stop();
 715                         retval = 0;
 716                 }
 717                 if (new_options & WDIOS_ENABLECARD) {
 718                         iTCO_wdt_keepalive();
 719                         iTCO_wdt_start();
 720                         retval = 0;
 721                 }
 722                 return retval;
 723         }
 724         case WDIOC_KEEPALIVE:
 725                 iTCO_wdt_keepalive();
 726                 return 0;
 727
 728         case WDIOC_SETTIMEOUT:
 729         {
 730                 if (get_user(new_heartbeat, p))
 731                         return -EFAULT;
 732                 if (iTCO_wdt_set_heartbeat(new_heartbeat))
 733                         return -EINVAL;
 734                 iTCO_wdt_keepalive();
 735                 /* Fall */
 736         }
 737         case WDIOC_GETTIMEOUT:
 738                 return put_user(heartbeat, p);
 739         case WDIOC_GETTIMELEFT:
 740         {
 741                 int time_left;
 742                 if (iTCO_wdt_get_timeleft(&time_left))
 743                         return -EINVAL;
 744                 return put_user(time_left, p);
 745         }
 746         default:
 747                 return -ENOTTY;
 748         }
 749 }
 750
 751 /*
 752  *      Kernel Interfaces
 753  */
 754
 755 static const struct file_operations iTCO_wdt_fops = {
 756         .owner =                THIS_MODULE,
 757         .llseek =               no_llseek,
 758         .write =                iTCO_wdt_write,
 759         .unlocked_ioctl =       iTCO_wdt_ioctl,
 760         .open =                 iTCO_wdt_open,
 761         .release =              iTCO_wdt_release,
 762 };
 763
 764 static struct miscdevice iTCO_wdt_miscdev = {
 765         .minor =        WATCHDOG_MINOR,
 766         .name =         "watchdog",
 767         .fops =         &iTCO_wdt_fops,
 768 };
 769
 770 /*
 771  *      Init & exit routines
 772  */
 773
 774 static int __devinit iTCO_wdt_init(struct pci_dev *pdev,
 775                 const struct pci_device_id *ent, struct platform_device *dev)
 776 {
 777         int ret;
 778         u32 base_address;
 779         unsigned long RCBA;
 780         unsigned long val32;
 781
 782         /*
 783          *      Find the ACPI/PM base I/O address which is the base
 784          *      for the TCO registers (TCOBASE=ACPIBASE + 0x60)
 785          *      ACPIBASE is bits [15:7] from 0x40-0x43
 786          */
 787         pci_read_config_dword(pdev, 0x40, &base_address);
 788         base_address &= 0x0000ff80;
 789         if (base_address == 0x00000000) {
 790                 /* Something's wrong here, ACPIBASE has to be set */
 791                 printk(KERN_ERR PFX "failed to get TCOBASE address, "
 792                                         "device disabled by hardware/BIOS\n");
 793                 return -ENODEV;
 794         }
 795         iTCO_wdt_private.iTCO_version =
 796                         iTCO_chipset_info[ent->driver_data].iTCO_version;
 797         iTCO_wdt_private.ACPIBASE = base_address;
 798         iTCO_wdt_private.pdev = pdev;
 799
 800         /* Get the Memory-Mapped GCS register, we need it for the
 801            NO_REBOOT flag (TCO v2). To get access to it you have to
 802            read RCBA from PCI Config space 0xf0 and use it as base.
 803            GCS = RCBA + ICH6_GCS(0x3410). */
 804         if (iTCO_wdt_private.iTCO_version == 2) {
 805                 pci_read_config_dword(pdev, 0xf0, &base_address);
 806                 if ((base_address & 1) == 0) {
 807                         printk(KERN_ERR PFX "RCBA is disabled by hardware"
 808                                                 "/BIOS, device disabled\n");
 809                         ret = -ENODEV;
 810                         goto out;
 811                 }
 812                 RCBA = base_address & 0xffffc000;
 813                 iTCO_wdt_private.gcs = ioremap((RCBA + 0x3410), 4);
 814         }
 815
 816         /* Check chipset's NO_REBOOT bit */
 817         if (iTCO_wdt_unset_NO_REBOOT_bit() && iTCO_vendor_check_noreboot_on()) {
 818                 printk(KERN_INFO PFX "unable to reset NO_REBOOT flag, "
 819                                         "device disabled by hardware/BIOS\n");
 820                 ret = -ENODEV;  /* Cannot reset NO_REBOOT bit */
 821                 goto out_unmap;
 822         }
 823
 824         /* Set the NO_REBOOT bit to prevent later reboots, just for sure */
 825         iTCO_wdt_set_NO_REBOOT_bit();
 826
 827         /* The TCO logic uses the TCO_EN bit in the SMI_EN register */
 828         if (!request_region(SMI_EN, 4, "iTCO_wdt")) {
 829                 printk(KERN_ERR PFX
 830                         "I/O address 0x%04lx already in use, "
 831                                                 "device disabled\n", SMI_EN);
 832                 ret = -EIO;
 833                 goto out_unmap;
 834         }
 835         /* Bit 13: TCO_EN -> 0 = Disables TCO logic generating an SMI# */
 836         val32 = inl(SMI_EN);
 837         val32 &= 0xffffdfff;    /* Turn off SMI clearing watchdog */
 838         outl(val32, SMI_EN);
 839
 840         /* The TCO I/O registers reside in a 32-byte range pointed to
 841            by the TCOBASE value */
 842         if (!request_region(TCOBASE, 0x20, "iTCO_wdt")) {
 843                 printk(KERN_ERR PFX "I/O address 0x%04lx already in use "
 844                                                 "device disabled\n", TCOBASE);
 845                 ret = -EIO;
 846                 goto unreg_smi_en;
 847         }
 848
 849         printk(KERN_INFO PFX
 850                 "Found a %s TCO device (Version=%d, TCOBASE=0x%04lx)\n",
 851                         iTCO_chipset_info[ent->driver_data].name,
 852                         iTCO_chipset_info[ent->driver_data].iTCO_version,
 853                         TCOBASE);
 854
 855         /* Clear out the (probably old) status */
 856         outw(0x0008, TCO1_STS); /* Clear the Time Out Status bit */
 857         outw(0x0002, TCO2_STS); /* Clear SECOND_TO_STS bit */
 858         outw(0x0004, TCO2_STS); /* Clear BOOT_STS bit */
 859
 860         /* Make sure the watchdog is not running */
 861         iTCO_wdt_stop();
 862
 863         /* Check that the heartbeat value is within it's range;
 864            if not reset to the default */
 865         if (iTCO_wdt_set_heartbeat(heartbeat)) {
 866                 iTCO_wdt_set_heartbeat(WATCHDOG_HEARTBEAT);
 867                 printk(KERN_INFO PFX
 868                         "timeout value out of range, using %d\n", heartbeat);
 869         }
 870
 871         ret = misc_register(&iTCO_wdt_miscdev);
 872         if (ret != 0) {
 873                 printk(KERN_ERR PFX
 874                         "cannot register miscdev on minor=%d (err=%d)\n",
 875                                                         WATCHDOG_MINOR, ret);
 876                 goto unreg_region;
 877         }
 878
 879         printk(KERN_INFO PFX "initialized. heartbeat=%d sec (nowayout=%d)\n",
 880                                                         heartbeat, nowayout);
 881
 882         return 0;
 883
 884 unreg_region:
 885         release_region(TCOBASE, 0x20);
 886 unreg_smi_en:
 887         release_region(SMI_EN, 4);
 888 out_unmap:
 889         if (iTCO_wdt_private.iTCO_version == 2)
 890                 iounmap(iTCO_wdt_private.gcs);
 891 out:
 892         iTCO_wdt_private.ACPIBASE = 0;
 893         return ret;
 894 }
 895
 896 static void __devexit iTCO_wdt_cleanup(void)
 897 {
 898         /* Stop the timer before we leave */
 899         if (!nowayout)
 900                 iTCO_wdt_stop();
 901
 902         /* Deregister */
 903         misc_deregister(&iTCO_wdt_miscdev);
 904         release_region(TCOBASE, 0x20);
 905         release_region(SMI_EN, 4);
 906         if (iTCO_wdt_private.iTCO_version == 2)
 907                 iounmap(iTCO_wdt_private.gcs);
 908         pci_dev_put(iTCO_wdt_private.pdev);
 909         iTCO_wdt_private.ACPIBASE = 0;
 910 }
 911
 912 static int __devinit iTCO_wdt_probe(struct platform_device *dev)
 913 {
 914         int ret = -ENODEV;
 915         int found = 0;
 916         struct pci_dev *pdev = NULL;
 917         const struct pci_device_id *ent;
 918
 919         spin_lock_init(&iTCO_wdt_private.io_lock);
 920
 921         for_each_pci_dev(pdev) {
 922                 ent = pci_match_id(iTCO_wdt_pci_tbl, pdev);
 923                 if (ent) {
 924                         found++;
 925                         ret = iTCO_wdt_init(pdev, ent, dev);
 926                         if (!ret)
 927                                 break;
 928                 }
 929         }
 930
 931         if (!found)
 932                 printk(KERN_INFO PFX "No device detected.\n");
 933
 934         return ret;
 935 }
 936
 937 static int __devexit iTCO_wdt_remove(struct platform_device *dev)
 938 {
 939         if (iTCO_wdt_private.ACPIBASE)
 940                 iTCO_wdt_cleanup();
 941
 942         return 0;
 943 }
 944
 945 static void iTCO_wdt_shutdown(struct platform_device *dev)
 946 {
 947         iTCO_wdt_stop();
 948 }
 949
 950 #define iTCO_wdt_suspend NULL
 951 #define iTCO_wdt_resume  NULL
 952
 953 static struct platform_driver iTCO_wdt_driver = {
 954         .probe          = iTCO_wdt_probe,
 955         .remove         = __devexit_p(iTCO_wdt_remove),
 956         .shutdown       = iTCO_wdt_shutdown,
 957         .suspend        = iTCO_wdt_suspend,
 958         .resume         = iTCO_wdt_resume,
 959         .driver         = {
 960                 .owner  = THIS_MODULE,
 961                 .name   = DRV_NAME,
 962         },
 963 };
 964
 965 static int __init iTCO_wdt_init_module(void)
 966 {
 967         int err;
 968
 969         printk(KERN_INFO PFX "Intel TCO WatchDog Timer Driver v%s\n",
 970                 DRV_VERSION);
 971
 972         err = platform_driver_register(&iTCO_wdt_driver);
 973         if (err)
 974                 return err;
 975
 976         iTCO_wdt_platform_device = platform_device_register_simple(DRV_NAME,
 977                                                                 -1, NULL, 0);
 978         if (IS_ERR(iTCO_wdt_platform_device)) {
 979                 err = PTR_ERR(iTCO_wdt_platform_device);
 980                 goto unreg_platform_driver;
 981         }
 982
 983         return 0;
 984
 985 unreg_platform_driver:
 986         platform_driver_unregister(&iTCO_wdt_driver);
 987         return err;
 988 }
 989
 990 static void __exit iTCO_wdt_cleanup_module(void)
 991 {
 992         platform_device_unregister(iTCO_wdt_platform_device);
 993         platform_driver_unregister(&iTCO_wdt_driver);
 994         printk(KERN_INFO PFX "Watchdog Module Unloaded.\n");
 995 }
 996
 997 module_init(iTCO_wdt_init_module);
 998 module_exit(iTCO_wdt_cleanup_module);
 999
1000 MODULE_AUTHOR("Wim Van Sebroeck <wim@iguana.be>");
1001 MODULE_DESCRIPTION("Intel TCO WatchDog Timer Driver");
1002 MODULE_VERSION(DRV_VERSION);
1003 MODULE_LICENSE("GPL");
1004 MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);