drivers/watchdog/sp5100_tco.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  *      sp5100_tco :    TCO timer driver for sp5100 chipsets
   4  *
   5  *      (c) Copyright 2009 Google Inc., All Rights Reserved.
   6  *
   7  *      Based on i8xx_tco.c:
   8  *      (c) Copyright 2000 kernel concepts <nils@kernelconcepts.de>, All Rights
   9  *      Reserved.
  10  *                              https://www.kernelconcepts.de
  11  *
  12  *      See AMD Publication 43009 "AMD SB700/710/750 Register Reference Guide",
  13  *          AMD Publication 44413 "AMD SP5100 Register Reference Guide"
  14  *          AMD Publication 45482 "AMD SB800-Series Southbridges Register
  15  *                                                            Reference Guide"
  16  *          AMD Publication 48751 "BIOS and Kernel Developer’s Guide (BKDG)
  17  *                              for AMD Family 16h Models 00h-0Fh Processors"
  18  *          AMD Publication 51192 "AMD Bolton FCH Register Reference Guide"
  19  *          AMD Publication 52740 "BIOS and Kernel Developer’s Guide (BKDG)
  20  *                              for AMD Family 16h Models 30h-3Fh Processors"
  21  *          AMD Publication 55570-B1-PUB "Processor Programming Reference (PPR)
  22  *                              for AMD Family 17h Model 18h, Revision B1
  23  *                              Processors (PUB)
  24  *          AMD Publication 55772-A1-PUB "Processor Programming Reference (PPR)
  25  *                              for AMD Family 17h Model 20h, Revision A1
  26  *                              Processors (PUB)
  27  */
  28
  29 /*
  30  *      Includes, defines, variables, module parameters, ...
  31  */
  32
  33 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  34
  35 #include <linux/init.h>
  36 #include <linux/io.h>
  37 #include <linux/ioport.h>
  38 #include <linux/module.h>
  39 #include <linux/moduleparam.h>
  40 #include <linux/pci.h>
  41 #include <linux/platform_device.h>
  42 #include <linux/types.h>
  43 #include <linux/watchdog.h>
  44
  45 #include "sp5100_tco.h"
  46
  47 #define TCO_DRIVER_NAME "sp5100-tco"
  48
  49 /* internal variables */
  50
  51 enum tco_reg_layout {
  52         sp5100, sb800, efch, efch_mmio
  53 };
  54
  55 struct sp5100_tco {
  56         struct watchdog_device wdd;
  57         void __iomem *tcobase;
  58         enum tco_reg_layout tco_reg_layout;
  59 };
  60
  61 /* the watchdog platform device */
  62 static struct platform_device *sp5100_tco_platform_device;
  63 /* the associated PCI device */
  64 static struct pci_dev *sp5100_tco_pci;
  65
  66 /* module parameters */
  67
  68 #define WATCHDOG_ACTION 0
  69 static bool action = WATCHDOG_ACTION;
  70 module_param(action, bool, 0);
  71 MODULE_PARM_DESC(action, "Action taken when watchdog expires, 0 to reset, 1 to poweroff (default="
  72                  __MODULE_STRING(WATCHDOG_ACTION) ")");
  73
  74 #define WATCHDOG_HEARTBEAT 60   /* 60 sec default heartbeat. */
  75 static int heartbeat = WATCHDOG_HEARTBEAT;  /* in seconds */
  76 module_param(heartbeat, int, 0);
  77 MODULE_PARM_DESC(heartbeat, "Watchdog heartbeat in seconds. (default="
  78                  __MODULE_STRING(WATCHDOG_HEARTBEAT) ")");
  79
  80 static bool nowayout = WATCHDOG_NOWAYOUT;
  81 module_param(nowayout, bool, 0);
  82 MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started."
  83                 " (default=" __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
  84
  85 /*
  86  * Some TCO specific functions
  87  */
  88
  89 static enum tco_reg_layout tco_reg_layout(struct pci_dev *dev)
  90 {
  91         if (dev->vendor == PCI_VENDOR_ID_ATI &&
  92             dev->device == PCI_DEVICE_ID_ATI_SBX00_SMBUS &&
  93             dev->revision < 0x40) {
  94                 return sp5100;
  95         } else if (dev->vendor == PCI_VENDOR_ID_AMD &&
  96             sp5100_tco_pci->device == PCI_DEVICE_ID_AMD_KERNCZ_SMBUS &&
  97             sp5100_tco_pci->revision >= AMD_ZEN_SMBUS_PCI_REV) {
  98                 return efch_mmio;
  99         } else if ((dev->vendor == PCI_VENDOR_ID_AMD || dev->vendor == PCI_VENDOR_ID_HYGON) &&
 100             ((dev->device == PCI_DEVICE_ID_AMD_HUDSON2_SMBUS &&
 101              dev->revision >= 0x41) ||
 102             (dev->device == PCI_DEVICE_ID_AMD_KERNCZ_SMBUS &&
 103              dev->revision >= 0x49))) {
 104                 return efch;
 105         }
 106         return sb800;
 107 }
 108
 109 static int tco_timer_start(struct watchdog_device *wdd)
 110 {
 111         struct sp5100_tco *tco = watchdog_get_drvdata(wdd);
 112         u32 val;
 113
 114         val = readl(SP5100_WDT_CONTROL(tco->tcobase));
 115         val |= SP5100_WDT_START_STOP_BIT;
 116         writel(val, SP5100_WDT_CONTROL(tco->tcobase));
 117
 118         /* This must be a distinct write. */
 119         val |= SP5100_WDT_TRIGGER_BIT;
 120         writel(val, SP5100_WDT_CONTROL(tco->tcobase));
 121
 122         return 0;
 123 }
 124
 125 static int tco_timer_stop(struct watchdog_device *wdd)
 126 {
 127         struct sp5100_tco *tco = watchdog_get_drvdata(wdd);
 128         u32 val;
 129
 130         val = readl(SP5100_WDT_CONTROL(tco->tcobase));
 131         val &= ~SP5100_WDT_START_STOP_BIT;
 132         writel(val, SP5100_WDT_CONTROL(tco->tcobase));
 133
 134         return 0;
 135 }
 136
 137 static int tco_timer_ping(struct watchdog_device *wdd)
 138 {
 139         struct sp5100_tco *tco = watchdog_get_drvdata(wdd);
 140         u32 val;
 141
 142         val = readl(SP5100_WDT_CONTROL(tco->tcobase));
 143         val |= SP5100_WDT_TRIGGER_BIT;
 144         writel(val, SP5100_WDT_CONTROL(tco->tcobase));
 145
 146         return 0;
 147 }
 148
 149 static int tco_timer_set_timeout(struct watchdog_device *wdd,
 150                                  unsigned int t)
 151 {
 152         struct sp5100_tco *tco = watchdog_get_drvdata(wdd);
 153
 154         /* Write new heartbeat to watchdog */
 155         writel(t, SP5100_WDT_COUNT(tco->tcobase));
 156
 157         wdd->timeout = t;
 158
 159         return 0;
 160 }
 161
 162 static unsigned int tco_timer_get_timeleft(struct watchdog_device *wdd)
 163 {
 164         struct sp5100_tco *tco = watchdog_get_drvdata(wdd);
 165
 166         return readl(SP5100_WDT_COUNT(tco->tcobase));
 167 }
 168
 169 static u8 sp5100_tco_read_pm_reg8(u8 index)
 170 {
 171         outb(index, SP5100_IO_PM_INDEX_REG);
 172         return inb(SP5100_IO_PM_DATA_REG);
 173 }
 174
 175 static void sp5100_tco_update_pm_reg8(u8 index, u8 reset, u8 set)
 176 {
 177         u8 val;
 178
 179         outb(index, SP5100_IO_PM_INDEX_REG);
 180         val = inb(SP5100_IO_PM_DATA_REG);
 181         val &= reset;
 182         val |= set;
 183         outb(val, SP5100_IO_PM_DATA_REG);
 184 }
 185
 186 static void tco_timer_enable(struct sp5100_tco *tco)
 187 {
 188         u32 val;
 189
 190         switch (tco->tco_reg_layout) {
 191         case sb800:
 192                 /* For SB800 or later */
 193                 /* Set the Watchdog timer resolution to 1 sec */
 194                 sp5100_tco_update_pm_reg8(SB800_PM_WATCHDOG_CONFIG,
 195                                           0xff, SB800_PM_WATCHDOG_SECOND_RES);
 196
 197                 /* Enable watchdog decode bit and watchdog timer */
 198                 sp5100_tco_update_pm_reg8(SB800_PM_WATCHDOG_CONTROL,
 199                                           ~SB800_PM_WATCHDOG_DISABLE,
 200                                           SB800_PCI_WATCHDOG_DECODE_EN);
 201                 break;
 202         case sp5100:
 203                 /* For SP5100 or SB7x0 */
 204                 /* Enable watchdog decode bit */
 205                 pci_read_config_dword(sp5100_tco_pci,
 206                                       SP5100_PCI_WATCHDOG_MISC_REG,
 207                                       &val);
 208
 209                 val |= SP5100_PCI_WATCHDOG_DECODE_EN;
 210
 211                 pci_write_config_dword(sp5100_tco_pci,
 212                                        SP5100_PCI_WATCHDOG_MISC_REG,
 213                                        val);
 214
 215                 /* Enable Watchdog timer and set the resolution to 1 sec */
 216                 sp5100_tco_update_pm_reg8(SP5100_PM_WATCHDOG_CONTROL,
 217                                           ~SP5100_PM_WATCHDOG_DISABLE,
 218                                           SP5100_PM_WATCHDOG_SECOND_RES);
 219                 break;
 220         case efch:
 221                 /* Set the Watchdog timer resolution to 1 sec and enable */
 222                 sp5100_tco_update_pm_reg8(EFCH_PM_DECODEEN3,
 223                                           ~EFCH_PM_WATCHDOG_DISABLE,
 224                                           EFCH_PM_DECODEEN_SECOND_RES);
 225                 break;
 226         default:
 227                 break;
 228         }
 229 }
 230
 231 static u32 sp5100_tco_read_pm_reg32(u8 index)
 232 {
 233         u32 val = 0;
 234         int i;
 235
 236         for (i = 3; i >= 0; i--)
 237                 val = (val << 8) + sp5100_tco_read_pm_reg8(index + i);
 238
 239         return val;
 240 }
 241
 242 static u32 sp5100_tco_request_region(struct device *dev,
 243                                      u32 mmio_addr,
 244                                      const char *dev_name)
 245 {
 246         if (!devm_request_mem_region(dev, mmio_addr, SP5100_WDT_MEM_MAP_SIZE,
 247                                      dev_name)) {
 248                 dev_dbg(dev, "MMIO address 0x%08x already in use\n", mmio_addr);
 249                 return 0;
 250         }
 251
 252         return mmio_addr;
 253 }
 254
 255 static u32 sp5100_tco_prepare_base(struct sp5100_tco *tco,
 256                                    u32 mmio_addr,
 257                                    u32 alt_mmio_addr,
 258                                    const char *dev_name)
 259 {
 260         struct device *dev = tco->wdd.parent;
 261
 262         dev_dbg(dev, "Got 0x%08x from SBResource_MMIO register\n", mmio_addr);
 263
 264         if (!mmio_addr && !alt_mmio_addr)
 265                 return -ENODEV;
 266
 267         /* Check for MMIO address and alternate MMIO address conflicts */
 268         if (mmio_addr)
 269                 mmio_addr = sp5100_tco_request_region(dev, mmio_addr, dev_name);
 270
 271         if (!mmio_addr && alt_mmio_addr)
 272                 mmio_addr = sp5100_tco_request_region(dev, alt_mmio_addr, dev_name);
 273
 274         if (!mmio_addr) {
 275                 dev_err(dev, "Failed to reserve MMIO or alternate MMIO region\n");
 276                 return -EBUSY;
 277         }
 278
 279         tco->tcobase = devm_ioremap(dev, mmio_addr, SP5100_WDT_MEM_MAP_SIZE);
 280         if (!tco->tcobase) {
 281                 dev_err(dev, "MMIO address 0x%08x failed mapping\n", mmio_addr);
 282                 devm_release_mem_region(dev, mmio_addr, SP5100_WDT_MEM_MAP_SIZE);
 283                 return -ENOMEM;
 284         }
 285
 286         dev_info(dev, "Using 0x%08x for watchdog MMIO address\n", mmio_addr);
 287
 288         return 0;
 289 }
 290
 291 static int sp5100_tco_timer_init(struct sp5100_tco *tco)
 292 {
 293         struct watchdog_device *wdd = &tco->wdd;
 294         struct device *dev = wdd->parent;
 295         u32 val;
 296
 297         val = readl(SP5100_WDT_CONTROL(tco->tcobase));
 298         if (val & SP5100_WDT_DISABLED) {
 299                 dev_err(dev, "Watchdog hardware is disabled\n");
 300                 return -ENODEV;
 301         }
 302
 303         /*
 304          * Save WatchDogFired status, because WatchDogFired flag is
 305          * cleared here.
 306          */
 307         if (val & SP5100_WDT_FIRED)
 308                 wdd->bootstatus = WDIOF_CARDRESET;
 309
 310         /* Set watchdog action */
 311         if (action)
 312                 val |= SP5100_WDT_ACTION_RESET;
 313         else
 314                 val &= ~SP5100_WDT_ACTION_RESET;
 315         writel(val, SP5100_WDT_CONTROL(tco->tcobase));
 316
 317         /* Set a reasonable heartbeat before we stop the timer */
 318         tco_timer_set_timeout(wdd, wdd->timeout);
 319
 320         /*
 321          * Stop the TCO before we change anything so we don't race with
 322          * a zeroed timer.
 323          */
 324         tco_timer_stop(wdd);
 325
 326         return 0;
 327 }
 328
 329 static u8 efch_read_pm_reg8(void __iomem *addr, u8 index)
 330 {
 331         return readb(addr + index);
 332 }
 333
 334 static void efch_update_pm_reg8(void __iomem *addr, u8 index, u8 reset, u8 set)
 335 {
 336         u8 val;
 337
 338         val = readb(addr + index);
 339         val &= reset;
 340         val |= set;
 341         writeb(val, addr + index);
 342 }
 343
 344 static void tco_timer_enable_mmio(void __iomem *addr)
 345 {
 346         efch_update_pm_reg8(addr, EFCH_PM_DECODEEN3,
 347                             ~EFCH_PM_WATCHDOG_DISABLE,
 348                             EFCH_PM_DECODEEN_SECOND_RES);
 349 }
 350
 351 static int sp5100_tco_setupdevice_mmio(struct device *dev,
 352                                        struct watchdog_device *wdd)
 353 {
 354         struct sp5100_tco *tco = watchdog_get_drvdata(wdd);
 355         const char *dev_name = SB800_DEVNAME;
 356         u32 mmio_addr = 0, alt_mmio_addr = 0;
 357         struct resource *res;
 358         void __iomem *addr;
 359         int ret;
 360         u32 val;
 361
 362         res = request_mem_region_muxed(EFCH_PM_ACPI_MMIO_PM_ADDR,
 363                                        EFCH_PM_ACPI_MMIO_PM_SIZE,
 364                                        "sp5100_tco");
 365
 366         if (!res) {
 367                 dev_err(dev,
 368                         "Memory region 0x%08x already in use\n",
 369                         EFCH_PM_ACPI_MMIO_PM_ADDR);
 370                 return -EBUSY;
 371         }
 372
 373         addr = ioremap(EFCH_PM_ACPI_MMIO_PM_ADDR, EFCH_PM_ACPI_MMIO_PM_SIZE);
 374         if (!addr) {
 375                 dev_err(dev, "Address mapping failed\n");
 376                 ret = -ENOMEM;
 377                 goto out;
 378         }
 379
 380         /*
 381          * EFCH_PM_DECODEEN_WDT_TMREN is dual purpose. This bitfield
 382          * enables sp5100_tco register MMIO space decoding. The bitfield
 383          * also starts the timer operation. Enable if not already enabled.
 384          */
 385         val = efch_read_pm_reg8(addr, EFCH_PM_DECODEEN);
 386         if (!(val & EFCH_PM_DECODEEN_WDT_TMREN)) {
 387                 efch_update_pm_reg8(addr, EFCH_PM_DECODEEN, 0xff,
 388                                     EFCH_PM_DECODEEN_WDT_TMREN);
 389         }
 390
 391         /* Error if the timer could not be enabled */
 392         val = efch_read_pm_reg8(addr, EFCH_PM_DECODEEN);
 393         if (!(val & EFCH_PM_DECODEEN_WDT_TMREN)) {
 394                 dev_err(dev, "Failed to enable the timer\n");
 395                 ret = -EFAULT;
 396                 goto out;
 397         }
 398
 399         mmio_addr = EFCH_PM_WDT_ADDR;
 400
 401         /* Determine alternate MMIO base address */
 402         val = efch_read_pm_reg8(addr, EFCH_PM_ISACONTROL);
 403         if (val & EFCH_PM_ISACONTROL_MMIOEN)
 404                 alt_mmio_addr = EFCH_PM_ACPI_MMIO_ADDR +
 405                         EFCH_PM_ACPI_MMIO_WDT_OFFSET;
 406
 407         ret = sp5100_tco_prepare_base(tco, mmio_addr, alt_mmio_addr, dev_name);
 408         if (!ret) {
 409                 tco_timer_enable_mmio(addr);
 410                 ret = sp5100_tco_timer_init(tco);
 411         }
 412
 413 out:
 414         if (addr)
 415                 iounmap(addr);
 416
 417         release_resource(res);
 418         kfree(res);
 419
 420         return ret;
 421 }
 422
 423 static int sp5100_tco_setupdevice(struct device *dev,
 424                                   struct watchdog_device *wdd)
 425 {
 426         struct sp5100_tco *tco = watchdog_get_drvdata(wdd);
 427         const char *dev_name;
 428         u32 mmio_addr = 0, val;
 429         u32 alt_mmio_addr = 0;
 430         int ret;
 431
 432         if (tco->tco_reg_layout == efch_mmio)
 433                 return sp5100_tco_setupdevice_mmio(dev, wdd);
 434
 435         /* Request the IO ports used by this driver */
 436         if (!request_muxed_region(SP5100_IO_PM_INDEX_REG,
 437                                   SP5100_PM_IOPORTS_SIZE, "sp5100_tco")) {
 438                 dev_err(dev, "I/O address 0x%04x already in use\n",
 439                         SP5100_IO_PM_INDEX_REG);
 440                 return -EBUSY;
 441         }
 442
 443         /*
 444          * Determine type of southbridge chipset.
 445          */
 446         switch (tco->tco_reg_layout) {
 447         case sp5100:
 448                 dev_name = SP5100_DEVNAME;
 449                 mmio_addr = sp5100_tco_read_pm_reg32(SP5100_PM_WATCHDOG_BASE) &
 450                                                                 0xfffffff8;
 451
 452                 /*
 453                  * Secondly, find the watchdog timer MMIO address
 454                  * from SBResource_MMIO register.
 455                  */
 456
 457                 /* Read SBResource_MMIO from PCI config(PCI_Reg: 9Ch) */
 458                 pci_read_config_dword(sp5100_tco_pci,
 459                                       SP5100_SB_RESOURCE_MMIO_BASE,
 460                                       &val);
 461
 462                 /* Verify MMIO is enabled and using bar0 */
 463                 if ((val & SB800_ACPI_MMIO_MASK) == SB800_ACPI_MMIO_DECODE_EN)
 464                         alt_mmio_addr = (val & ~0xfff) + SB800_PM_WDT_MMIO_OFFSET;
 465                 break;
 466         case sb800:
 467                 dev_name = SB800_DEVNAME;
 468                 mmio_addr = sp5100_tco_read_pm_reg32(SB800_PM_WATCHDOG_BASE) &
 469                                                                 0xfffffff8;
 470
 471                 /* Read SBResource_MMIO from AcpiMmioEn(PM_Reg: 24h) */
 472                 val = sp5100_tco_read_pm_reg32(SB800_PM_ACPI_MMIO_EN);
 473
 474                 /* Verify MMIO is enabled and using bar0 */
 475                 if ((val & SB800_ACPI_MMIO_MASK) == SB800_ACPI_MMIO_DECODE_EN)
 476                         alt_mmio_addr = (val & ~0xfff) + SB800_PM_WDT_MMIO_OFFSET;
 477                 break;
 478         case efch:
 479                 dev_name = SB800_DEVNAME;
 480                 val = sp5100_tco_read_pm_reg8(EFCH_PM_DECODEEN);
 481                 if (val & EFCH_PM_DECODEEN_WDT_TMREN)
 482                         mmio_addr = EFCH_PM_WDT_ADDR;
 483
 484                 val = sp5100_tco_read_pm_reg8(EFCH_PM_ISACONTROL);
 485                 if (val & EFCH_PM_ISACONTROL_MMIOEN)
 486                         alt_mmio_addr = EFCH_PM_ACPI_MMIO_ADDR +
 487                                 EFCH_PM_ACPI_MMIO_WDT_OFFSET;
 488                 break;
 489         default:
 490                 return -ENODEV;
 491         }
 492
 493         ret = sp5100_tco_prepare_base(tco, mmio_addr, alt_mmio_addr, dev_name);
 494         if (!ret) {
 495                 /* Setup the watchdog timer */
 496                 tco_timer_enable(tco);
 497                 ret = sp5100_tco_timer_init(tco);
 498         }
 499
 500         release_region(SP5100_IO_PM_INDEX_REG, SP5100_PM_IOPORTS_SIZE);
 501         return ret;
 502 }
 503
 504 static struct watchdog_info sp5100_tco_wdt_info = {
 505         .identity = "SP5100 TCO timer",
 506         .options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING | WDIOF_MAGICCLOSE,
 507 };
 508
 509 static const struct watchdog_ops sp5100_tco_wdt_ops = {
 510         .owner = THIS_MODULE,
 511         .start = tco_timer_start,
 512         .stop = tco_timer_stop,
 513         .ping = tco_timer_ping,
 514         .set_timeout = tco_timer_set_timeout,
 515         .get_timeleft = tco_timer_get_timeleft,
 516 };
 517
 518 static int sp5100_tco_probe(struct platform_device *pdev)
 519 {
 520         struct device *dev = &pdev->dev;
 521         struct watchdog_device *wdd;
 522         struct sp5100_tco *tco;
 523         int ret;
 524
 525         tco = devm_kzalloc(dev, sizeof(*tco), GFP_KERNEL);
 526         if (!tco)
 527                 return -ENOMEM;
 528
 529         tco->tco_reg_layout = tco_reg_layout(sp5100_tco_pci);
 530
 531         wdd = &tco->wdd;
 532         wdd->parent = dev;
 533         wdd->info = &sp5100_tco_wdt_info;
 534         wdd->ops = &sp5100_tco_wdt_ops;
 535         wdd->timeout = WATCHDOG_HEARTBEAT;
 536         wdd->min_timeout = 1;
 537         wdd->max_timeout = 0xffff;
 538
 539         watchdog_init_timeout(wdd, heartbeat, NULL);
 540         watchdog_set_nowayout(wdd, nowayout);
 541         watchdog_stop_on_reboot(wdd);
 542         watchdog_stop_on_unregister(wdd);
 543         watchdog_set_drvdata(wdd, tco);
 544
 545         ret = sp5100_tco_setupdevice(dev, wdd);
 546         if (ret)
 547                 return ret;
 548
 549         ret = devm_watchdog_register_device(dev, wdd);
 550         if (ret)
 551                 return ret;
 552
 553         /* Show module parameters */
 554         dev_info(dev, "initialized. heartbeat=%d sec (nowayout=%d)\n",
 555                  wdd->timeout, nowayout);
 556
 557         return 0;
 558 }
 559
 560 static struct platform_driver sp5100_tco_driver = {
 561         .probe          = sp5100_tco_probe,
 562         .driver         = {
 563                 .name   = TCO_DRIVER_NAME,
 564         },
 565 };
 566
 567 /*
 568  * Data for PCI driver interface
 569  *
 570  * This data only exists for exporting the supported
 571  * PCI ids via MODULE_DEVICE_TABLE.  We do not actually
 572  * register a pci_driver, because someone else might
 573  * want to register another driver on the same PCI id.
 574  */
 575 static const struct pci_device_id sp5100_tco_pci_tbl[] = {
 576         { PCI_VENDOR_ID_ATI, PCI_DEVICE_ID_ATI_SBX00_SMBUS, PCI_ANY_ID,
 577           PCI_ANY_ID, },
 578         { PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_HUDSON2_SMBUS, PCI_ANY_ID,
 579           PCI_ANY_ID, },
 580         { PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_KERNCZ_SMBUS, PCI_ANY_ID,
 581           PCI_ANY_ID, },
 582         { PCI_VENDOR_ID_HYGON, PCI_DEVICE_ID_AMD_KERNCZ_SMBUS, PCI_ANY_ID,
 583           PCI_ANY_ID, },
 584         { 0, },                 /* End of list */
 585 };
 586 MODULE_DEVICE_TABLE(pci, sp5100_tco_pci_tbl);
 587
 588 static int __init sp5100_tco_init(void)
 589 {
 590         struct pci_dev *dev = NULL;
 591         int err;
 592
 593         /* Match the PCI device */
 594         for_each_pci_dev(dev) {
 595                 if (pci_match_id(sp5100_tco_pci_tbl, dev) != NULL) {
 596                         sp5100_tco_pci = dev;
 597                         break;
 598                 }
 599         }
 600
 601         if (!sp5100_tco_pci)
 602                 return -ENODEV;
 603
 604         pr_info("SP5100/SB800 TCO WatchDog Timer Driver\n");
 605
 606         err = platform_driver_register(&sp5100_tco_driver);
 607         if (err)
 608                 return err;
 609
 610         sp5100_tco_platform_device =
 611                 platform_device_register_simple(TCO_DRIVER_NAME, -1, NULL, 0);
 612         if (IS_ERR(sp5100_tco_platform_device)) {
 613                 err = PTR_ERR(sp5100_tco_platform_device);
 614                 goto unreg_platform_driver;
 615         }
 616
 617         return 0;
 618
 619 unreg_platform_driver:
 620         platform_driver_unregister(&sp5100_tco_driver);
 621         return err;
 622 }
 623
 624 static void __exit sp5100_tco_exit(void)
 625 {
 626         platform_device_unregister(sp5100_tco_platform_device);
 627         platform_driver_unregister(&sp5100_tco_driver);
 628 }
 629
 630 module_init(sp5100_tco_init);
 631 module_exit(sp5100_tco_exit);
 632
 633 MODULE_AUTHOR("Priyanka Gupta");
 634 MODULE_DESCRIPTION("TCO timer driver for SP5100/SB800 chipset");
 635 MODULE_LICENSE("GPL");