drivers/watchdog/iTCO_wdt.c

   1 /*
   2  *      intel TCO Watchdog Driver
   3  *
   4  *      (c) Copyright 2006-2011 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 322896-001, 322897-001: NM10
  30  *      document number 313056-003, 313057-017: 82801H (ICH8)
  31  *      document number 316972-004, 316973-012: 82801I (ICH9)
  32  *      document number 319973-002, 319974-002: 82801J (ICH10)
  33  *      document number 322169-001, 322170-003: 5 Series, 3400 Series (PCH)
  34  *      document number 320066-003, 320257-008: EP80597 (IICH)
  35  *      document number 324645-001, 324646-001: Cougar Point (CPT)
  36  *      document number TBD                   : Patsburg (PBG)
  37  *      document number TBD                   : DH89xxCC
  38  *      document number TBD                   : Panther Point
  39  */
  40
  41 /*
  42  *      Includes, defines, variables, module parameters, ...
  43  */
  44
  45 /* Module and version information */
  46 #define DRV_NAME        "iTCO_wdt"
  47 #define DRV_VERSION     "1.07"
  48 #define PFX             DRV_NAME ": "
  49
  50 /* Includes */
  51 #include <linux/module.h>               /* For module specific items */
  52 #include <linux/moduleparam.h>          /* For new moduleparam's */
  53 #include <linux/types.h>                /* For standard types (like size_t) */
  54 #include <linux/errno.h>                /* For the -ENODEV/... values */
  55 #include <linux/kernel.h>               /* For printk/panic/... */
  56 #include <linux/miscdevice.h>           /* For MODULE_ALIAS_MISCDEV
  57                                                         (WATCHDOG_MINOR) */
  58 #include <linux/watchdog.h>             /* For the watchdog specific items */
  59 #include <linux/init.h>                 /* For __init/__exit/... */
  60 #include <linux/fs.h>                   /* For file operations */
  61 #include <linux/platform_device.h>      /* For platform_driver framework */
  62 #include <linux/pci.h>                  /* For pci functions */
  63 #include <linux/ioport.h>               /* For io-port access */
  64 #include <linux/spinlock.h>             /* For spin_lock/spin_unlock/... */
  65 #include <linux/uaccess.h>              /* For copy_to_user/put_user/... */
  66 #include <linux/io.h>                   /* For inb/outb/... */
  67
  68 #include "iTCO_vendor.h"
  69
  70 /* TCO related info */
  71 enum iTCO_chipsets {
  72         TCO_ICH = 0,    /* ICH */
  73         TCO_ICH0,       /* ICH0 */
  74         TCO_ICH2,       /* ICH2 */
  75         TCO_ICH2M,      /* ICH2-M */
  76         TCO_ICH3,       /* ICH3-S */
  77         TCO_ICH3M,      /* ICH3-M */
  78         TCO_ICH4,       /* ICH4 */
  79         TCO_ICH4M,      /* ICH4-M */
  80         TCO_CICH,       /* C-ICH */
  81         TCO_ICH5,       /* ICH5 & ICH5R */
  82         TCO_6300ESB,    /* 6300ESB */
  83         TCO_ICH6,       /* ICH6 & ICH6R */
  84         TCO_ICH6M,      /* ICH6-M */
  85         TCO_ICH6W,      /* ICH6W & ICH6RW */
  86         TCO_631XESB,    /* 631xESB/632xESB */
  87         TCO_ICH7,       /* ICH7 & ICH7R */
  88         TCO_ICH7DH,     /* ICH7DH */
  89         TCO_ICH7M,      /* ICH7-M & ICH7-U */
  90         TCO_ICH7MDH,    /* ICH7-M DH */
  91         TCO_NM10,       /* NM10 */
  92         TCO_ICH8,       /* ICH8 & ICH8R */
  93         TCO_ICH8DH,     /* ICH8DH */
  94         TCO_ICH8DO,     /* ICH8DO */
  95         TCO_ICH8M,      /* ICH8M */
  96         TCO_ICH8ME,     /* ICH8M-E */
  97         TCO_ICH9,       /* ICH9 */
  98         TCO_ICH9R,      /* ICH9R */
  99         TCO_ICH9DH,     /* ICH9DH */
 100         TCO_ICH9DO,     /* ICH9DO */
 101         TCO_ICH9M,      /* ICH9M */
 102         TCO_ICH9ME,     /* ICH9M-E */
 103         TCO_ICH10,      /* ICH10 */
 104         TCO_ICH10R,     /* ICH10R */
 105         TCO_ICH10D,     /* ICH10D */
 106         TCO_ICH10DO,    /* ICH10DO */
 107         TCO_PCH,        /* PCH Desktop Full Featured */
 108         TCO_PCHM,       /* PCH Mobile Full Featured */
 109         TCO_P55,        /* P55 */
 110         TCO_PM55,       /* PM55 */
 111         TCO_H55,        /* H55 */
 112         TCO_QM57,       /* QM57 */
 113         TCO_H57,        /* H57 */
 114         TCO_HM55,       /* HM55 */
 115         TCO_Q57,        /* Q57 */
 116         TCO_HM57,       /* HM57 */
 117         TCO_PCHMSFF,    /* PCH Mobile SFF Full Featured */
 118         TCO_QS57,       /* QS57 */
 119         TCO_3400,       /* 3400 */
 120         TCO_3420,       /* 3420 */
 121         TCO_3450,       /* 3450 */
 122         TCO_EP80579,    /* EP80579 */
 123         TCO_CPT,        /* Cougar Point */
 124         TCO_CPTD,       /* Cougar Point Desktop */
 125         TCO_CPTM,       /* Cougar Point Mobile */
 126         TCO_PBG,        /* Patsburg */
 127         TCO_DH89XXCC,   /* DH89xxCC */
 128         TCO_PPT,        /* Panther Point */
 129 };
 130
 131 static struct {
 132         char *name;
 133         unsigned int iTCO_version;
 134 } iTCO_chipset_info[] __devinitdata = {
 135         {"ICH", 1},
 136         {"ICH0", 1},
 137         {"ICH2", 1},
 138         {"ICH2-M", 1},
 139         {"ICH3-S", 1},
 140         {"ICH3-M", 1},
 141         {"ICH4", 1},
 142         {"ICH4-M", 1},
 143         {"C-ICH", 1},
 144         {"ICH5 or ICH5R", 1},
 145         {"6300ESB", 1},
 146         {"ICH6 or ICH6R", 2},
 147         {"ICH6-M", 2},
 148         {"ICH6W or ICH6RW", 2},
 149         {"631xESB/632xESB", 2},
 150         {"ICH7 or ICH7R", 2},
 151         {"ICH7DH", 2},
 152         {"ICH7-M or ICH7-U", 2},
 153         {"ICH7-M DH", 2},
 154         {"NM10", 2},
 155         {"ICH8 or ICH8R", 2},
 156         {"ICH8DH", 2},
 157         {"ICH8DO", 2},
 158         {"ICH8M", 2},
 159         {"ICH8M-E", 2},
 160         {"ICH9", 2},
 161         {"ICH9R", 2},
 162         {"ICH9DH", 2},
 163         {"ICH9DO", 2},
 164         {"ICH9M", 2},
 165         {"ICH9M-E", 2},
 166         {"ICH10", 2},
 167         {"ICH10R", 2},
 168         {"ICH10D", 2},
 169         {"ICH10DO", 2},
 170         {"PCH Desktop Full Featured", 2},
 171         {"PCH Mobile Full Featured", 2},
 172         {"P55", 2},
 173         {"PM55", 2},
 174         {"H55", 2},
 175         {"QM57", 2},
 176         {"H57", 2},
 177         {"HM55", 2},
 178         {"Q57", 2},
 179         {"HM57", 2},
 180         {"PCH Mobile SFF Full Featured", 2},
 181         {"QS57", 2},
 182         {"3400", 2},
 183         {"3420", 2},
 184         {"3450", 2},
 185         {"EP80579", 2},
 186         {"Cougar Point", 2},
 187         {"Cougar Point Desktop", 2},
 188         {"Cougar Point Mobile", 2},
 189         {"Patsburg", 2},
 190         {"DH89xxCC", 2},
 191         {"Panther Point", 2},
 192         {NULL, 0}
 193 };
 194
 195 /*
 196  * This data only exists for exporting the supported PCI ids
 197  * via MODULE_DEVICE_TABLE.  We do not actually register a
 198  * pci_driver, because the I/O Controller Hub has also other
 199  * functions that probably will be registered by other drivers.
 200  */
 201 static DEFINE_PCI_DEVICE_TABLE(iTCO_wdt_pci_tbl) = {
 202         { PCI_VDEVICE(INTEL, 0x2410), TCO_ICH},
 203         { PCI_VDEVICE(INTEL, 0x2420), TCO_ICH0},
 204         { PCI_VDEVICE(INTEL, 0x2440), TCO_ICH2},
 205         { PCI_VDEVICE(INTEL, 0x244c), TCO_ICH2M},
 206         { PCI_VDEVICE(INTEL, 0x2480), TCO_ICH3},
 207         { PCI_VDEVICE(INTEL, 0x248c), TCO_ICH3M},
 208         { PCI_VDEVICE(INTEL, 0x24c0), TCO_ICH4},
 209         { PCI_VDEVICE(INTEL, 0x24cc), TCO_ICH4M},
 210         { PCI_VDEVICE(INTEL, 0x2450), TCO_CICH},
 211         { PCI_VDEVICE(INTEL, 0x24d0), TCO_ICH5},
 212         { PCI_VDEVICE(INTEL, 0x25a1), TCO_6300ESB},
 213         { PCI_VDEVICE(INTEL, 0x2640), TCO_ICH6},
 214         { PCI_VDEVICE(INTEL, 0x2641), TCO_ICH6M},
 215         { PCI_VDEVICE(INTEL, 0x2642), TCO_ICH6W},
 216         { PCI_VDEVICE(INTEL, 0x2670), TCO_631XESB},
 217         { PCI_VDEVICE(INTEL, 0x2671), TCO_631XESB},
 218         { PCI_VDEVICE(INTEL, 0x2672), TCO_631XESB},
 219         { PCI_VDEVICE(INTEL, 0x2673), TCO_631XESB},
 220         { PCI_VDEVICE(INTEL, 0x2674), TCO_631XESB},
 221         { PCI_VDEVICE(INTEL, 0x2675), TCO_631XESB},
 222         { PCI_VDEVICE(INTEL, 0x2676), TCO_631XESB},
 223         { PCI_VDEVICE(INTEL, 0x2677), TCO_631XESB},
 224         { PCI_VDEVICE(INTEL, 0x2678), TCO_631XESB},
 225         { PCI_VDEVICE(INTEL, 0x2679), TCO_631XESB},
 226         { PCI_VDEVICE(INTEL, 0x267a), TCO_631XESB},
 227         { PCI_VDEVICE(INTEL, 0x267b), TCO_631XESB},
 228         { PCI_VDEVICE(INTEL, 0x267c), TCO_631XESB},
 229         { PCI_VDEVICE(INTEL, 0x267d), TCO_631XESB},
 230         { PCI_VDEVICE(INTEL, 0x267e), TCO_631XESB},
 231         { PCI_VDEVICE(INTEL, 0x267f), TCO_631XESB},
 232         { PCI_VDEVICE(INTEL, 0x27b8), TCO_ICH7},
 233         { PCI_VDEVICE(INTEL, 0x27b0), TCO_ICH7DH},
 234         { PCI_VDEVICE(INTEL, 0x27b9), TCO_ICH7M},
 235         { PCI_VDEVICE(INTEL, 0x27bd), TCO_ICH7MDH},
 236         { PCI_VDEVICE(INTEL, 0x27bc), TCO_NM10},
 237         { PCI_VDEVICE(INTEL, 0x2810), TCO_ICH8},
 238         { PCI_VDEVICE(INTEL, 0x2812), TCO_ICH8DH},
 239         { PCI_VDEVICE(INTEL, 0x2814), TCO_ICH8DO},
 240         { PCI_VDEVICE(INTEL, 0x2815), TCO_ICH8M},
 241         { PCI_VDEVICE(INTEL, 0x2811), TCO_ICH8ME},
 242         { PCI_VDEVICE(INTEL, 0x2918), TCO_ICH9},
 243         { PCI_VDEVICE(INTEL, 0x2916), TCO_ICH9R},
 244         { PCI_VDEVICE(INTEL, 0x2912), TCO_ICH9DH},
 245         { PCI_VDEVICE(INTEL, 0x2914), TCO_ICH9DO},
 246         { PCI_VDEVICE(INTEL, 0x2919), TCO_ICH9M},
 247         { PCI_VDEVICE(INTEL, 0x2917), TCO_ICH9ME},
 248         { PCI_VDEVICE(INTEL, 0x3a18), TCO_ICH10},
 249         { PCI_VDEVICE(INTEL, 0x3a16), TCO_ICH10R},
 250         { PCI_VDEVICE(INTEL, 0x3a1a), TCO_ICH10D},
 251         { PCI_VDEVICE(INTEL, 0x3a14), TCO_ICH10DO},
 252         { PCI_VDEVICE(INTEL, 0x3b00), TCO_PCH},
 253         { PCI_VDEVICE(INTEL, 0x3b01), TCO_PCHM},
 254         { PCI_VDEVICE(INTEL, 0x3b02), TCO_P55},
 255         { PCI_VDEVICE(INTEL, 0x3b03), TCO_PM55},
 256         { PCI_VDEVICE(INTEL, 0x3b06), TCO_H55},
 257         { PCI_VDEVICE(INTEL, 0x3b07), TCO_QM57},
 258         { PCI_VDEVICE(INTEL, 0x3b08), TCO_H57},
 259         { PCI_VDEVICE(INTEL, 0x3b09), TCO_HM55},
 260         { PCI_VDEVICE(INTEL, 0x3b0a), TCO_Q57},
 261         { PCI_VDEVICE(INTEL, 0x3b0b), TCO_HM57},
 262         { PCI_VDEVICE(INTEL, 0x3b0d), TCO_PCHMSFF},
 263         { PCI_VDEVICE(INTEL, 0x3b0f), TCO_QS57},
 264         { PCI_VDEVICE(INTEL, 0x3b12), TCO_3400},
 265         { PCI_VDEVICE(INTEL, 0x3b14), TCO_3420},
 266         { PCI_VDEVICE(INTEL, 0x3b16), TCO_3450},
 267         { PCI_VDEVICE(INTEL, 0x5031), TCO_EP80579},
 268         { PCI_VDEVICE(INTEL, 0x1c41), TCO_CPT},
 269         { PCI_VDEVICE(INTEL, 0x1c42), TCO_CPTD},
 270         { PCI_VDEVICE(INTEL, 0x1c43), TCO_CPTM},
 271         { PCI_VDEVICE(INTEL, 0x1c44), TCO_CPT},
 272         { PCI_VDEVICE(INTEL, 0x1c45), TCO_CPT},
 273         { PCI_VDEVICE(INTEL, 0x1c46), TCO_CPT},
 274         { PCI_VDEVICE(INTEL, 0x1c47), TCO_CPT},
 275         { PCI_VDEVICE(INTEL, 0x1c48), TCO_CPT},
 276         { PCI_VDEVICE(INTEL, 0x1c49), TCO_CPT},
 277         { PCI_VDEVICE(INTEL, 0x1c4a), TCO_CPT},
 278         { PCI_VDEVICE(INTEL, 0x1c4b), TCO_CPT},
 279         { PCI_VDEVICE(INTEL, 0x1c4c), TCO_CPT},
 280         { PCI_VDEVICE(INTEL, 0x1c4d), TCO_CPT},
 281         { PCI_VDEVICE(INTEL, 0x1c4e), TCO_CPT},
 282         { PCI_VDEVICE(INTEL, 0x1c4f), TCO_CPT},
 283         { PCI_VDEVICE(INTEL, 0x1c50), TCO_CPT},
 284         { PCI_VDEVICE(INTEL, 0x1c51), TCO_CPT},
 285         { PCI_VDEVICE(INTEL, 0x1c52), TCO_CPT},
 286         { PCI_VDEVICE(INTEL, 0x1c53), TCO_CPT},
 287         { PCI_VDEVICE(INTEL, 0x1c54), TCO_CPT},
 288         { PCI_VDEVICE(INTEL, 0x1c55), TCO_CPT},
 289         { PCI_VDEVICE(INTEL, 0x1c56), TCO_CPT},
 290         { PCI_VDEVICE(INTEL, 0x1c57), TCO_CPT},
 291         { PCI_VDEVICE(INTEL, 0x1c58), TCO_CPT},
 292         { PCI_VDEVICE(INTEL, 0x1c59), TCO_CPT},
 293         { PCI_VDEVICE(INTEL, 0x1c5a), TCO_CPT},
 294         { PCI_VDEVICE(INTEL, 0x1c5b), TCO_CPT},
 295         { PCI_VDEVICE(INTEL, 0x1c5c), TCO_CPT},
 296         { PCI_VDEVICE(INTEL, 0x1c5d), TCO_CPT},
 297         { PCI_VDEVICE(INTEL, 0x1c5e), TCO_CPT},
 298         { PCI_VDEVICE(INTEL, 0x1c5f), TCO_CPT},
 299         { PCI_VDEVICE(INTEL, 0x1d40), TCO_PBG},
 300         { PCI_VDEVICE(INTEL, 0x1d41), TCO_PBG},
 301         { PCI_VDEVICE(INTEL, 0x2310), TCO_DH89XXCC},
 302         { PCI_VDEVICE(INTEL, 0x1e40), TCO_PPT},
 303         { PCI_VDEVICE(INTEL, 0x1e41), TCO_PPT},
 304         { PCI_VDEVICE(INTEL, 0x1e42), TCO_PPT},
 305         { PCI_VDEVICE(INTEL, 0x1e43), TCO_PPT},
 306         { PCI_VDEVICE(INTEL, 0x1e44), TCO_PPT},
 307         { PCI_VDEVICE(INTEL, 0x1e45), TCO_PPT},
 308         { PCI_VDEVICE(INTEL, 0x1e46), TCO_PPT},
 309         { PCI_VDEVICE(INTEL, 0x1e47), TCO_PPT},
 310         { PCI_VDEVICE(INTEL, 0x1e48), TCO_PPT},
 311         { PCI_VDEVICE(INTEL, 0x1e49), TCO_PPT},
 312         { PCI_VDEVICE(INTEL, 0x1e4a), TCO_PPT},
 313         { PCI_VDEVICE(INTEL, 0x1e4b), TCO_PPT},
 314         { PCI_VDEVICE(INTEL, 0x1e4c), TCO_PPT},
 315         { PCI_VDEVICE(INTEL, 0x1e4d), TCO_PPT},
 316         { PCI_VDEVICE(INTEL, 0x1e4e), TCO_PPT},
 317         { PCI_VDEVICE(INTEL, 0x1e4f), TCO_PPT},
 318         { PCI_VDEVICE(INTEL, 0x1e50), TCO_PPT},
 319         { PCI_VDEVICE(INTEL, 0x1e51), TCO_PPT},
 320         { PCI_VDEVICE(INTEL, 0x1e52), TCO_PPT},
 321         { PCI_VDEVICE(INTEL, 0x1e53), TCO_PPT},
 322         { PCI_VDEVICE(INTEL, 0x1e54), TCO_PPT},
 323         { PCI_VDEVICE(INTEL, 0x1e55), TCO_PPT},
 324         { PCI_VDEVICE(INTEL, 0x1e56), TCO_PPT},
 325         { PCI_VDEVICE(INTEL, 0x1e57), TCO_PPT},
 326         { PCI_VDEVICE(INTEL, 0x1e58), TCO_PPT},
 327         { PCI_VDEVICE(INTEL, 0x1e59), TCO_PPT},
 328         { PCI_VDEVICE(INTEL, 0x1e5a), TCO_PPT},
 329         { PCI_VDEVICE(INTEL, 0x1e5b), TCO_PPT},
 330         { PCI_VDEVICE(INTEL, 0x1e5c), TCO_PPT},
 331         { PCI_VDEVICE(INTEL, 0x1e5d), TCO_PPT},
 332         { PCI_VDEVICE(INTEL, 0x1e5e), TCO_PPT},
 333         { PCI_VDEVICE(INTEL, 0x1e5f), TCO_PPT},
 334         { 0, },                 /* End of list */
 335 };
 336 MODULE_DEVICE_TABLE(pci, iTCO_wdt_pci_tbl);
 337
 338 /* Address definitions for the TCO */
 339 /* TCO base address */
 340 #define TCOBASE         (iTCO_wdt_private.ACPIBASE + 0x60)
 341 /* SMI Control and Enable Register */
 342 #define SMI_EN          (iTCO_wdt_private.ACPIBASE + 0x30)
 343
 344 #define TCO_RLD         (TCOBASE + 0x00) /* TCO Timer Reload and Curr. Value */
 345 #define TCOv1_TMR       (TCOBASE + 0x01) /* TCOv1 Timer Initial Value   */
 346 #define TCO_DAT_IN      (TCOBASE + 0x02) /* TCO Data In Register        */
 347 #define TCO_DAT_OUT     (TCOBASE + 0x03) /* TCO Data Out Register       */
 348 #define TCO1_STS        (TCOBASE + 0x04) /* TCO1 Status Register        */
 349 #define TCO2_STS        (TCOBASE + 0x06) /* TCO2 Status Register        */
 350 #define TCO1_CNT        (TCOBASE + 0x08) /* TCO1 Control Register       */
 351 #define TCO2_CNT        (TCOBASE + 0x0a) /* TCO2 Control Register       */
 352 #define TCOv2_TMR       (TCOBASE + 0x12) /* TCOv2 Timer Initial Value   */
 353
 354 /* internal variables */
 355 static unsigned long is_active;
 356 static char expect_release;
 357 static struct {         /* this is private data for the iTCO_wdt device */
 358         /* TCO version/generation */
 359         unsigned int iTCO_version;
 360         /* The device's ACPIBASE address (TCOBASE = ACPIBASE+0x60) */
 361         unsigned long ACPIBASE;
 362         /* NO_REBOOT flag is Memory-Mapped GCS register bit 5 (TCO version 2)*/
 363         unsigned long __iomem *gcs;
 364         /* the lock for io operations */
 365         spinlock_t io_lock;
 366         /* the PCI-device */
 367         struct pci_dev *pdev;
 368 } iTCO_wdt_private;
 369
 370 /* the watchdog platform device */
 371 static struct platform_device *iTCO_wdt_platform_device;
 372
 373 /* module parameters */
 374 #define WATCHDOG_HEARTBEAT 30   /* 30 sec default heartbeat */
 375 static int heartbeat = WATCHDOG_HEARTBEAT;  /* in seconds */
 376 module_param(heartbeat, int, 0);
 377 MODULE_PARM_DESC(heartbeat, "Watchdog timeout in seconds. "
 378         "5..76 (TCO v1) or 3..614 (TCO v2), default="
 379                                 __MODULE_STRING(WATCHDOG_HEARTBEAT) ")");
 380
 381 static int nowayout = WATCHDOG_NOWAYOUT;
 382 module_param(nowayout, int, 0);
 383 MODULE_PARM_DESC(nowayout,
 384         "Watchdog cannot be stopped once started (default="
 385                                 __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
 386
 387 static int turn_SMI_watchdog_clear_off = 1;
 388 module_param(turn_SMI_watchdog_clear_off, int, 0);
 389 MODULE_PARM_DESC(turn_SMI_watchdog_clear_off,
 390         "Turn off SMI clearing watchdog (depends on TCO-version)(default=1)");
 391
 392 /*
 393  * Some TCO specific functions
 394  */
 395
 396 static inline unsigned int seconds_to_ticks(int seconds)
 397 {
 398         /* the internal timer is stored as ticks which decrement
 399          * every 0.6 seconds */
 400         return (seconds * 10) / 6;
 401 }
 402
 403 static void iTCO_wdt_set_NO_REBOOT_bit(void)
 404 {
 405         u32 val32;
 406
 407         /* Set the NO_REBOOT bit: this disables reboots */
 408         if (iTCO_wdt_private.iTCO_version == 2) {
 409                 val32 = readl(iTCO_wdt_private.gcs);
 410                 val32 |= 0x00000020;
 411                 writel(val32, iTCO_wdt_private.gcs);
 412         } else if (iTCO_wdt_private.iTCO_version == 1) {
 413                 pci_read_config_dword(iTCO_wdt_private.pdev, 0xd4, &val32);
 414                 val32 |= 0x00000002;
 415                 pci_write_config_dword(iTCO_wdt_private.pdev, 0xd4, val32);
 416         }
 417 }
 418
 419 static int iTCO_wdt_unset_NO_REBOOT_bit(void)
 420 {
 421         int ret = 0;
 422         u32 val32;
 423
 424         /* Unset the NO_REBOOT bit: this enables reboots */
 425         if (iTCO_wdt_private.iTCO_version == 2) {
 426                 val32 = readl(iTCO_wdt_private.gcs);
 427                 val32 &= 0xffffffdf;
 428                 writel(val32, iTCO_wdt_private.gcs);
 429
 430                 val32 = readl(iTCO_wdt_private.gcs);
 431                 if (val32 & 0x00000020)
 432                         ret = -EIO;
 433         } else if (iTCO_wdt_private.iTCO_version == 1) {
 434                 pci_read_config_dword(iTCO_wdt_private.pdev, 0xd4, &val32);
 435                 val32 &= 0xfffffffd;
 436                 pci_write_config_dword(iTCO_wdt_private.pdev, 0xd4, val32);
 437
 438                 pci_read_config_dword(iTCO_wdt_private.pdev, 0xd4, &val32);
 439                 if (val32 & 0x00000002)
 440                         ret = -EIO;
 441         }
 442
 443         return ret; /* returns: 0 = OK, -EIO = Error */
 444 }
 445
 446 static int iTCO_wdt_start(void)
 447 {
 448         unsigned int val;
 449
 450         spin_lock(&iTCO_wdt_private.io_lock);
 451
 452         iTCO_vendor_pre_start(iTCO_wdt_private.ACPIBASE, heartbeat);
 453
 454         /* disable chipset's NO_REBOOT bit */
 455         if (iTCO_wdt_unset_NO_REBOOT_bit()) {
 456                 spin_unlock(&iTCO_wdt_private.io_lock);
 457                 printk(KERN_ERR PFX "failed to reset NO_REBOOT flag, "
 458                                         "reboot disabled by hardware/BIOS\n");
 459                 return -EIO;
 460         }
 461
 462         /* Force the timer to its reload value by writing to the TCO_RLD
 463            register */
 464         if (iTCO_wdt_private.iTCO_version == 2)
 465                 outw(0x01, TCO_RLD);
 466         else if (iTCO_wdt_private.iTCO_version == 1)
 467                 outb(0x01, TCO_RLD);
 468
 469         /* Bit 11: TCO Timer Halt -> 0 = The TCO timer is enabled to count */
 470         val = inw(TCO1_CNT);
 471         val &= 0xf7ff;
 472         outw(val, TCO1_CNT);
 473         val = inw(TCO1_CNT);
 474         spin_unlock(&iTCO_wdt_private.io_lock);
 475
 476         if (val & 0x0800)
 477                 return -1;
 478         return 0;
 479 }
 480
 481 static int iTCO_wdt_stop(void)
 482 {
 483         unsigned int val;
 484
 485         spin_lock(&iTCO_wdt_private.io_lock);
 486
 487         iTCO_vendor_pre_stop(iTCO_wdt_private.ACPIBASE);
 488
 489         /* Bit 11: TCO Timer Halt -> 1 = The TCO timer is disabled */
 490         val = inw(TCO1_CNT);
 491         val |= 0x0800;
 492         outw(val, TCO1_CNT);
 493         val = inw(TCO1_CNT);
 494
 495         /* Set the NO_REBOOT bit to prevent later reboots, just for sure */
 496         iTCO_wdt_set_NO_REBOOT_bit();
 497
 498         spin_unlock(&iTCO_wdt_private.io_lock);
 499
 500         if ((val & 0x0800) == 0)
 501                 return -1;
 502         return 0;
 503 }
 504
 505 static int iTCO_wdt_keepalive(void)
 506 {
 507         spin_lock(&iTCO_wdt_private.io_lock);
 508
 509         iTCO_vendor_pre_keepalive(iTCO_wdt_private.ACPIBASE, heartbeat);
 510
 511         /* Reload the timer by writing to the TCO Timer Counter register */
 512         if (iTCO_wdt_private.iTCO_version == 2)
 513                 outw(0x01, TCO_RLD);
 514         else if (iTCO_wdt_private.iTCO_version == 1) {
 515                 /* Reset the timeout status bit so that the timer
 516                  * needs to count down twice again before rebooting */
 517                 outw(0x0008, TCO1_STS); /* write 1 to clear bit */
 518
 519                 outb(0x01, TCO_RLD);
 520         }
 521
 522         spin_unlock(&iTCO_wdt_private.io_lock);
 523         return 0;
 524 }
 525
 526 static int iTCO_wdt_set_heartbeat(int t)
 527 {
 528         unsigned int val16;
 529         unsigned char val8;
 530         unsigned int tmrval;
 531
 532         tmrval = seconds_to_ticks(t);
 533
 534         /* For TCO v1 the timer counts down twice before rebooting */
 535         if (iTCO_wdt_private.iTCO_version == 1)
 536                 tmrval /= 2;
 537
 538         /* from the specs: */
 539         /* "Values of 0h-3h are ignored and should not be attempted" */
 540         if (tmrval < 0x04)
 541                 return -EINVAL;
 542         if (((iTCO_wdt_private.iTCO_version == 2) && (tmrval > 0x3ff)) ||
 543             ((iTCO_wdt_private.iTCO_version == 1) && (tmrval > 0x03f)))
 544                 return -EINVAL;
 545
 546         iTCO_vendor_pre_set_heartbeat(tmrval);
 547
 548         /* Write new heartbeat to watchdog */
 549         if (iTCO_wdt_private.iTCO_version == 2) {
 550                 spin_lock(&iTCO_wdt_private.io_lock);
 551                 val16 = inw(TCOv2_TMR);
 552                 val16 &= 0xfc00;
 553                 val16 |= tmrval;
 554                 outw(val16, TCOv2_TMR);
 555                 val16 = inw(TCOv2_TMR);
 556                 spin_unlock(&iTCO_wdt_private.io_lock);
 557
 558                 if ((val16 & 0x3ff) != tmrval)
 559                         return -EINVAL;
 560         } else if (iTCO_wdt_private.iTCO_version == 1) {
 561                 spin_lock(&iTCO_wdt_private.io_lock);
 562                 val8 = inb(TCOv1_TMR);
 563                 val8 &= 0xc0;
 564                 val8 |= (tmrval & 0xff);
 565                 outb(val8, TCOv1_TMR);
 566                 val8 = inb(TCOv1_TMR);
 567                 spin_unlock(&iTCO_wdt_private.io_lock);
 568
 569                 if ((val8 & 0x3f) != tmrval)
 570                         return -EINVAL;
 571         }
 572
 573         heartbeat = t;
 574         return 0;
 575 }
 576
 577 static int iTCO_wdt_get_timeleft(int *time_left)
 578 {
 579         unsigned int val16;
 580         unsigned char val8;
 581
 582         /* read the TCO Timer */
 583         if (iTCO_wdt_private.iTCO_version == 2) {
 584                 spin_lock(&iTCO_wdt_private.io_lock);
 585                 val16 = inw(TCO_RLD);
 586                 val16 &= 0x3ff;
 587                 spin_unlock(&iTCO_wdt_private.io_lock);
 588
 589                 *time_left = (val16 * 6) / 10;
 590         } else if (iTCO_wdt_private.iTCO_version == 1) {
 591                 spin_lock(&iTCO_wdt_private.io_lock);
 592                 val8 = inb(TCO_RLD);
 593                 val8 &= 0x3f;
 594                 if (!(inw(TCO1_STS) & 0x0008))
 595                         val8 += (inb(TCOv1_TMR) & 0x3f);
 596                 spin_unlock(&iTCO_wdt_private.io_lock);
 597
 598                 *time_left = (val8 * 6) / 10;
 599         } else
 600                 return -EINVAL;
 601         return 0;
 602 }
 603
 604 /*
 605  *      /dev/watchdog handling
 606  */
 607
 608 static int iTCO_wdt_open(struct inode *inode, struct file *file)
 609 {
 610         /* /dev/watchdog can only be opened once */
 611         if (test_and_set_bit(0, &is_active))
 612                 return -EBUSY;
 613
 614         /*
 615          *      Reload and activate timer
 616          */
 617         iTCO_wdt_start();
 618         return nonseekable_open(inode, file);
 619 }
 620
 621 static int iTCO_wdt_release(struct inode *inode, struct file *file)
 622 {
 623         /*
 624          *      Shut off the timer.
 625          */
 626         if (expect_release == 42) {
 627                 iTCO_wdt_stop();
 628         } else {
 629                 printk(KERN_CRIT PFX
 630                         "Unexpected close, not stopping watchdog!\n");
 631                 iTCO_wdt_keepalive();
 632         }
 633         clear_bit(0, &is_active);
 634         expect_release = 0;
 635         return 0;
 636 }
 637
 638 static ssize_t iTCO_wdt_write(struct file *file, const char __user *data,
 639                               size_t len, loff_t *ppos)
 640 {
 641         /* See if we got the magic character 'V' and reload the timer */
 642         if (len) {
 643                 if (!nowayout) {
 644                         size_t i;
 645
 646                         /* note: just in case someone wrote the magic
 647                            character five months ago... */
 648                         expect_release = 0;
 649
 650                         /* scan to see whether or not we got the
 651                            magic character */
 652                         for (i = 0; i != len; i++) {
 653                                 char c;
 654                                 if (get_user(c, data + i))
 655                                         return -EFAULT;
 656                                 if (c == 'V')
 657                                         expect_release = 42;
 658                         }
 659                 }
 660
 661                 /* someone wrote to us, we should reload the timer */
 662                 iTCO_wdt_keepalive();
 663         }
 664         return len;
 665 }
 666
 667 static long iTCO_wdt_ioctl(struct file *file, unsigned int cmd,
 668                                                         unsigned long arg)
 669 {
 670         int new_options, retval = -EINVAL;
 671         int new_heartbeat;
 672         void __user *argp = (void __user *)arg;
 673         int __user *p = argp;
 674         static const struct watchdog_info ident = {
 675                 .options =              WDIOF_SETTIMEOUT |
 676                                         WDIOF_KEEPALIVEPING |
 677                                         WDIOF_MAGICCLOSE,
 678                 .firmware_version =     0,
 679                 .identity =             DRV_NAME,
 680         };
 681
 682         switch (cmd) {
 683         case WDIOC_GETSUPPORT:
 684                 return copy_to_user(argp, &ident, sizeof(ident)) ? -EFAULT : 0;
 685         case WDIOC_GETSTATUS:
 686         case WDIOC_GETBOOTSTATUS:
 687                 return put_user(0, p);
 688
 689         case WDIOC_SETOPTIONS:
 690         {
 691                 if (get_user(new_options, p))
 692                         return -EFAULT;
 693
 694                 if (new_options & WDIOS_DISABLECARD) {
 695                         iTCO_wdt_stop();
 696                         retval = 0;
 697                 }
 698                 if (new_options & WDIOS_ENABLECARD) {
 699                         iTCO_wdt_keepalive();
 700                         iTCO_wdt_start();
 701                         retval = 0;
 702                 }
 703                 return retval;
 704         }
 705         case WDIOC_KEEPALIVE:
 706                 iTCO_wdt_keepalive();
 707                 return 0;
 708
 709         case WDIOC_SETTIMEOUT:
 710         {
 711                 if (get_user(new_heartbeat, p))
 712                         return -EFAULT;
 713                 if (iTCO_wdt_set_heartbeat(new_heartbeat))
 714                         return -EINVAL;
 715                 iTCO_wdt_keepalive();
 716                 /* Fall */
 717         }
 718         case WDIOC_GETTIMEOUT:
 719                 return put_user(heartbeat, p);
 720         case WDIOC_GETTIMELEFT:
 721         {
 722                 int time_left;
 723                 if (iTCO_wdt_get_timeleft(&time_left))
 724                         return -EINVAL;
 725                 return put_user(time_left, p);
 726         }
 727         default:
 728                 return -ENOTTY;
 729         }
 730 }
 731
 732 /*
 733  *      Kernel Interfaces
 734  */
 735
 736 static const struct file_operations iTCO_wdt_fops = {
 737         .owner =                THIS_MODULE,
 738         .llseek =               no_llseek,
 739         .write =                iTCO_wdt_write,
 740         .unlocked_ioctl =       iTCO_wdt_ioctl,
 741         .open =                 iTCO_wdt_open,
 742         .release =              iTCO_wdt_release,
 743 };
 744
 745 static struct miscdevice iTCO_wdt_miscdev = {
 746         .minor =        WATCHDOG_MINOR,
 747         .name =         "watchdog",
 748         .fops =         &iTCO_wdt_fops,
 749 };
 750
 751 /*
 752  *      Init & exit routines
 753  */
 754
 755 static int __devinit iTCO_wdt_init(struct pci_dev *pdev,
 756                 const struct pci_device_id *ent, struct platform_device *dev)
 757 {
 758         int ret;
 759         u32 base_address;
 760         unsigned long RCBA;
 761         unsigned long val32;
 762
 763         /*
 764          *      Find the ACPI/PM base I/O address which is the base
 765          *      for the TCO registers (TCOBASE=ACPIBASE + 0x60)
 766          *      ACPIBASE is bits [15:7] from 0x40-0x43
 767          */
 768         pci_read_config_dword(pdev, 0x40, &base_address);
 769         base_address &= 0x0000ff80;
 770         if (base_address == 0x00000000) {
 771                 /* Something's wrong here, ACPIBASE has to be set */
 772                 printk(KERN_ERR PFX "failed to get TCOBASE address, "
 773                                         "device disabled by hardware/BIOS\n");
 774                 return -ENODEV;
 775         }
 776         iTCO_wdt_private.iTCO_version =
 777                         iTCO_chipset_info[ent->driver_data].iTCO_version;
 778         iTCO_wdt_private.ACPIBASE = base_address;
 779         iTCO_wdt_private.pdev = pdev;
 780
 781         /* Get the Memory-Mapped GCS register, we need it for the
 782            NO_REBOOT flag (TCO v2). To get access to it you have to
 783            read RCBA from PCI Config space 0xf0 and use it as base.
 784            GCS = RCBA + ICH6_GCS(0x3410). */
 785         if (iTCO_wdt_private.iTCO_version == 2) {
 786                 pci_read_config_dword(pdev, 0xf0, &base_address);
 787                 if ((base_address & 1) == 0) {
 788                         printk(KERN_ERR PFX "RCBA is disabled by hardware"
 789                                                 "/BIOS, device disabled\n");
 790                         ret = -ENODEV;
 791                         goto out;
 792                 }
 793                 RCBA = base_address & 0xffffc000;
 794                 iTCO_wdt_private.gcs = ioremap((RCBA + 0x3410), 4);
 795         }
 796
 797         /* Check chipset's NO_REBOOT bit */
 798         if (iTCO_wdt_unset_NO_REBOOT_bit() && iTCO_vendor_check_noreboot_on()) {
 799                 printk(KERN_INFO PFX "unable to reset NO_REBOOT flag, "
 800                                         "device disabled by hardware/BIOS\n");
 801                 ret = -ENODEV;  /* Cannot reset NO_REBOOT bit */
 802                 goto out_unmap;
 803         }
 804
 805         /* Set the NO_REBOOT bit to prevent later reboots, just for sure */
 806         iTCO_wdt_set_NO_REBOOT_bit();
 807
 808         /* The TCO logic uses the TCO_EN bit in the SMI_EN register */
 809         if (!request_region(SMI_EN, 4, "iTCO_wdt")) {
 810                 printk(KERN_ERR PFX
 811                         "I/O address 0x%04lx already in use, "
 812                                                 "device disabled\n", SMI_EN);
 813                 ret = -EIO;
 814                 goto out_unmap;
 815         }
 816         if (turn_SMI_watchdog_clear_off >= iTCO_wdt_private.iTCO_version) {
 817                 /* Bit 13: TCO_EN -> 0 = Disables TCO logic generating an SMI# */
 818                 val32 = inl(SMI_EN);
 819                 val32 &= 0xffffdfff;    /* Turn off SMI clearing watchdog */
 820                 outl(val32, SMI_EN);
 821         }
 822
 823         /* The TCO I/O registers reside in a 32-byte range pointed to
 824            by the TCOBASE value */
 825         if (!request_region(TCOBASE, 0x20, "iTCO_wdt")) {
 826                 printk(KERN_ERR PFX "I/O address 0x%04lx already in use "
 827                                                 "device disabled\n", TCOBASE);
 828                 ret = -EIO;
 829                 goto unreg_smi_en;
 830         }
 831
 832         printk(KERN_INFO PFX
 833                 "Found a %s TCO device (Version=%d, TCOBASE=0x%04lx)\n",
 834                         iTCO_chipset_info[ent->driver_data].name,
 835                         iTCO_chipset_info[ent->driver_data].iTCO_version,
 836                         TCOBASE);
 837
 838         /* Clear out the (probably old) status */
 839         outw(0x0008, TCO1_STS); /* Clear the Time Out Status bit */
 840         outw(0x0002, TCO2_STS); /* Clear SECOND_TO_STS bit */
 841         outw(0x0004, TCO2_STS); /* Clear BOOT_STS bit */
 842
 843         /* Make sure the watchdog is not running */
 844         iTCO_wdt_stop();
 845
 846         /* Check that the heartbeat value is within it's range;
 847            if not reset to the default */
 848         if (iTCO_wdt_set_heartbeat(heartbeat)) {
 849                 iTCO_wdt_set_heartbeat(WATCHDOG_HEARTBEAT);
 850                 printk(KERN_INFO PFX
 851                         "timeout value out of range, using %d\n", heartbeat);
 852         }
 853
 854         ret = misc_register(&iTCO_wdt_miscdev);
 855         if (ret != 0) {
 856                 printk(KERN_ERR PFX
 857                         "cannot register miscdev on minor=%d (err=%d)\n",
 858                                                         WATCHDOG_MINOR, ret);
 859                 goto unreg_region;
 860         }
 861
 862         printk(KERN_INFO PFX "initialized. heartbeat=%d sec (nowayout=%d)\n",
 863                                                         heartbeat, nowayout);
 864
 865         return 0;
 866
 867 unreg_region:
 868         release_region(TCOBASE, 0x20);
 869 unreg_smi_en:
 870         release_region(SMI_EN, 4);
 871 out_unmap:
 872         if (iTCO_wdt_private.iTCO_version == 2)
 873                 iounmap(iTCO_wdt_private.gcs);
 874 out:
 875         iTCO_wdt_private.ACPIBASE = 0;
 876         return ret;
 877 }
 878
 879 static void __devexit iTCO_wdt_cleanup(void)
 880 {
 881         /* Stop the timer before we leave */
 882         if (!nowayout)
 883                 iTCO_wdt_stop();
 884
 885         /* Deregister */
 886         misc_deregister(&iTCO_wdt_miscdev);
 887         release_region(TCOBASE, 0x20);
 888         release_region(SMI_EN, 4);
 889         if (iTCO_wdt_private.iTCO_version == 2)
 890                 iounmap(iTCO_wdt_private.gcs);
 891         pci_dev_put(iTCO_wdt_private.pdev);
 892         iTCO_wdt_private.ACPIBASE = 0;
 893 }
 894
 895 static int __devinit iTCO_wdt_probe(struct platform_device *dev)
 896 {
 897         int ret = -ENODEV;
 898         int found = 0;
 899         struct pci_dev *pdev = NULL;
 900         const struct pci_device_id *ent;
 901
 902         spin_lock_init(&iTCO_wdt_private.io_lock);
 903
 904         for_each_pci_dev(pdev) {
 905                 ent = pci_match_id(iTCO_wdt_pci_tbl, pdev);
 906                 if (ent) {
 907                         found++;
 908                         ret = iTCO_wdt_init(pdev, ent, dev);
 909                         if (!ret)
 910                                 break;
 911                 }
 912         }
 913
 914         if (!found)
 915                 printk(KERN_INFO PFX "No device detected.\n");
 916
 917         return ret;
 918 }
 919
 920 static int __devexit iTCO_wdt_remove(struct platform_device *dev)
 921 {
 922         if (iTCO_wdt_private.ACPIBASE)
 923                 iTCO_wdt_cleanup();
 924
 925         return 0;
 926 }
 927
 928 static void iTCO_wdt_shutdown(struct platform_device *dev)
 929 {
 930         iTCO_wdt_stop();
 931 }
 932
 933 static struct platform_driver iTCO_wdt_driver = {
 934         .probe          = iTCO_wdt_probe,
 935         .remove         = __devexit_p(iTCO_wdt_remove),
 936         .shutdown       = iTCO_wdt_shutdown,
 937         .driver         = {
 938                 .owner  = THIS_MODULE,
 939                 .name   = DRV_NAME,
 940         },
 941 };
 942
 943 static int __init iTCO_wdt_init_module(void)
 944 {
 945         int err;
 946
 947         printk(KERN_INFO PFX "Intel TCO WatchDog Timer Driver v%s\n",
 948                 DRV_VERSION);
 949
 950         err = platform_driver_register(&iTCO_wdt_driver);
 951         if (err)
 952                 return err;
 953
 954         iTCO_wdt_platform_device = platform_device_register_simple(DRV_NAME,
 955                                                                 -1, NULL, 0);
 956         if (IS_ERR(iTCO_wdt_platform_device)) {
 957                 err = PTR_ERR(iTCO_wdt_platform_device);
 958                 goto unreg_platform_driver;
 959         }
 960
 961         return 0;
 962
 963 unreg_platform_driver:
 964         platform_driver_unregister(&iTCO_wdt_driver);
 965         return err;
 966 }
 967
 968 static void __exit iTCO_wdt_cleanup_module(void)
 969 {
 970         platform_device_unregister(iTCO_wdt_platform_device);
 971         platform_driver_unregister(&iTCO_wdt_driver);
 972         printk(KERN_INFO PFX "Watchdog Module Unloaded.\n");
 973 }
 974
 975 module_init(iTCO_wdt_init_module);
 976 module_exit(iTCO_wdt_cleanup_module);
 977
 978 MODULE_AUTHOR("Wim Van Sebroeck <wim@iguana.be>");
 979 MODULE_DESCRIPTION("Intel TCO WatchDog Timer Driver");
 980 MODULE_VERSION(DRV_VERSION);
 981 MODULE_LICENSE("GPL");
 982 MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);