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   1 /*
   2  *      HP WatchDog Driver
   3  *      based on
   4  *
   5  *      SoftDog 0.05:   A Software Watchdog Device
   6  *
   7  *      (c) Copyright 2007 Hewlett-Packard Development Company, L.P.
   8  *      Thomas Mingarelli <thomas.mingarelli@hp.com>
   9  *
  10  *      This program is free software; you can redistribute it and/or
  11  *      modify it under the terms of the GNU General Public License
  12  *      version 2 as published by the Free Software Foundation
  13  *
  14  */
  15
  16 #include <linux/device.h>
  17 #include <linux/fs.h>
  18 #include <linux/init.h>
  19 #include <linux/interrupt.h>
  20 #include <linux/io.h>
  21 #include <linux/irq.h>
  22 #include <linux/kernel.h>
  23 #include <linux/miscdevice.h>
  24 #include <linux/mm.h>
  25 #include <linux/module.h>
  26 #include <linux/kdebug.h>
  27 #include <linux/moduleparam.h>
  28 #include <linux/notifier.h>
  29 #include <linux/pci.h>
  30 #include <linux/pci_ids.h>
  31 #include <linux/reboot.h>
  32 #include <linux/sched.h>
  33 #include <linux/timer.h>
  34 #include <linux/types.h>
  35 #include <linux/uaccess.h>
  36 #include <linux/watchdog.h>
  37 #include <linux/dmi.h>
  38 #include <linux/efi.h>
  39 #include <linux/string.h>
  40 #include <linux/bootmem.h>
  41 #include <linux/slab.h>
  42 #include <asm/desc.h>
  43 #include <asm/cacheflush.h>
  44
  45 #define PCI_BIOS32_SD_VALUE             0x5F32335F      /* "_32_" */
  46 #define CRU_BIOS_SIGNATURE_VALUE        0x55524324
  47 #define PCI_BIOS32_PARAGRAPH_LEN        16
  48 #define PCI_ROM_BASE1                   0x000F0000
  49 #define ROM_SIZE                        0x10000
  50 #define HPWDT_VERSION                   "1.01"
  51
  52 struct bios32_service_dir {
  53         u32 signature;
  54         u32 entry_point;
  55         u8 revision;
  56         u8 length;
  57         u8 checksum;
  58         u8 reserved[5];
  59 };
  60
  61 /* type 212 */
  62 struct smbios_cru64_info {
  63         u8 type;
  64         u8 byte_length;
  65         u16 handle;
  66         u32 signature;
  67         u64 physical_address;
  68         u32 double_length;
  69         u32 double_offset;
  70 };
  71 #define SMBIOS_CRU64_INFORMATION        212
  72
  73 struct cmn_registers {
  74         union {
  75                 struct {
  76                         u8 ral;
  77                         u8 rah;
  78                         u16 rea2;
  79                 };
  80                 u32 reax;
  81         } u1;
  82         union {
  83                 struct {
  84                         u8 rbl;
  85                         u8 rbh;
  86                         u8 reb2l;
  87                         u8 reb2h;
  88                 };
  89                 u32 rebx;
  90         } u2;
  91         union {
  92                 struct {
  93                         u8 rcl;
  94                         u8 rch;
  95                         u16 rec2;
  96                 };
  97                 u32 recx;
  98         } u3;
  99         union {
 100                 struct {
 101                         u8 rdl;
 102                         u8 rdh;
 103                         u16 red2;
 104                 };
 105                 u32 redx;
 106         } u4;
 107
 108         u32 resi;
 109         u32 redi;
 110         u16 rds;
 111         u16 res;
 112         u32 reflags;
 113 }  __attribute__((packed));
 114
 115 #define DEFAULT_MARGIN  30
 116 static unsigned int soft_margin = DEFAULT_MARGIN;       /* in seconds */
 117 static unsigned int reload;                     /* the computed soft_margin */
 118 static int nowayout = WATCHDOG_NOWAYOUT;
 119 static char expect_release;
 120 static unsigned long hpwdt_is_open;
 121 static unsigned int allow_kdump;
 122
 123 static void __iomem *pci_mem_addr;              /* the PCI-memory address */
 124 static unsigned long __iomem *hpwdt_timer_reg;
 125 static unsigned long __iomem *hpwdt_timer_con;
 126
 127 static DEFINE_SPINLOCK(rom_lock);
 128
 129 static void *cru_rom_addr;
 130
 131 static struct cmn_registers cmn_regs;
 132
 133 static struct pci_device_id hpwdt_devices[] = {
 134         { PCI_DEVICE(PCI_VENDOR_ID_COMPAQ, 0xB203) },
 135         { PCI_DEVICE(PCI_VENDOR_ID_HP, 0x3306) },
 136         {0},                    /* terminate list */
 137 };
 138 MODULE_DEVICE_TABLE(pci, hpwdt_devices);
 139
 140 extern asmlinkage void asminline_call(struct cmn_registers *pi86Regs, unsigned long *pRomEntry);
 141
 142 #ifndef CONFIG_X86_64
 143 /* --32 Bit Bios------------------------------------------------------------ */
 144
 145 #define HPWDT_ARCH      32
 146
 147 asm(".text                          \n\t"
 148     ".align 4                       \n"
 149     "asminline_call:                \n\t"
 150     "pushl       %ebp               \n\t"
 151     "movl        %esp, %ebp         \n\t"
 152     "pusha                          \n\t"
 153     "pushf                          \n\t"
 154     "push        %es                \n\t"
 155     "push        %ds                \n\t"
 156     "pop         %es                \n\t"
 157     "movl        8(%ebp),%eax       \n\t"
 158     "movl        4(%eax),%ebx       \n\t"
 159     "movl        8(%eax),%ecx       \n\t"
 160     "movl        12(%eax),%edx      \n\t"
 161     "movl        16(%eax),%esi      \n\t"
 162     "movl        20(%eax),%edi      \n\t"
 163     "movl        (%eax),%eax        \n\t"
 164     "push        %cs                \n\t"
 165     "call        *12(%ebp)          \n\t"
 166     "pushf                          \n\t"
 167     "pushl       %eax               \n\t"
 168     "movl        8(%ebp),%eax       \n\t"
 169     "movl        %ebx,4(%eax)       \n\t"
 170     "movl        %ecx,8(%eax)       \n\t"
 171     "movl        %edx,12(%eax)      \n\t"
 172     "movl        %esi,16(%eax)      \n\t"
 173     "movl        %edi,20(%eax)      \n\t"
 174     "movw        %ds,24(%eax)       \n\t"
 175     "movw        %es,26(%eax)       \n\t"
 176     "popl        %ebx               \n\t"
 177     "movl        %ebx,(%eax)        \n\t"
 178     "popl        %ebx               \n\t"
 179     "movl        %ebx,28(%eax)      \n\t"
 180     "pop         %es                \n\t"
 181     "popf                           \n\t"
 182     "popa                           \n\t"
 183     "leave                          \n\t"
 184     "ret                            \n\t"
 185     ".previous");
 186
 187
 188 /*
 189  *      cru_detect
 190  *
 191  *      Routine Description:
 192  *      This function uses the 32-bit BIOS Service Directory record to
 193  *      search for a $CRU record.
 194  *
 195  *      Return Value:
 196  *      0        :  SUCCESS
 197  *      <0       :  FAILURE
 198  */
 199 static int __devinit cru_detect(unsigned long map_entry,
 200         unsigned long map_offset)
 201 {
 202         void *bios32_map;
 203         unsigned long *bios32_entrypoint;
 204         unsigned long cru_physical_address;
 205         unsigned long cru_length;
 206         unsigned long physical_bios_base = 0;
 207         unsigned long physical_bios_offset = 0;
 208         int retval = -ENODEV;
 209
 210         bios32_map = ioremap(map_entry, (2 * PAGE_SIZE));
 211
 212         if (bios32_map == NULL)
 213                 return -ENODEV;
 214
 215         bios32_entrypoint = bios32_map + map_offset;
 216
 217         cmn_regs.u1.reax = CRU_BIOS_SIGNATURE_VALUE;
 218
 219         asminline_call(&cmn_regs, bios32_entrypoint);
 220
 221         if (cmn_regs.u1.ral != 0) {
 222                 printk(KERN_WARNING
 223                         "hpwdt: Call succeeded but with an error: 0x%x\n",
 224                         cmn_regs.u1.ral);
 225         } else {
 226                 physical_bios_base = cmn_regs.u2.rebx;
 227                 physical_bios_offset = cmn_regs.u4.redx;
 228                 cru_length = cmn_regs.u3.recx;
 229                 cru_physical_address =
 230                         physical_bios_base + physical_bios_offset;
 231
 232                 /* If the values look OK, then map it in. */
 233                 if ((physical_bios_base + physical_bios_offset)) {
 234                         cru_rom_addr =
 235                                 ioremap(cru_physical_address, cru_length);
 236                         if (cru_rom_addr)
 237                                 retval = 0;
 238                 }
 239
 240                 printk(KERN_DEBUG "hpwdt: CRU Base Address:   0x%lx\n",
 241                         physical_bios_base);
 242                 printk(KERN_DEBUG "hpwdt: CRU Offset Address: 0x%lx\n",
 243                         physical_bios_offset);
 244                 printk(KERN_DEBUG "hpwdt: CRU Length:         0x%lx\n",
 245                         cru_length);
 246                 printk(KERN_DEBUG "hpwdt: CRU Mapped Address: 0x%x\n",
 247                         (unsigned int)&cru_rom_addr);
 248         }
 249         iounmap(bios32_map);
 250         return retval;
 251 }
 252
 253 /*
 254  *      bios_checksum
 255  */
 256 static int __devinit bios_checksum(const char __iomem *ptr, int len)
 257 {
 258         char sum = 0;
 259         int i;
 260
 261         /*
 262          * calculate checksum of size bytes. This should add up
 263          * to zero if we have a valid header.
 264          */
 265         for (i = 0; i < len; i++)
 266                 sum += ptr[i];
 267
 268         return ((sum == 0) && (len > 0));
 269 }
 270
 271 /*
 272  *      bios32_present
 273  *
 274  *      Routine Description:
 275  *      This function finds the 32-bit BIOS Service Directory
 276  *
 277  *      Return Value:
 278  *      0        :  SUCCESS
 279  *      <0       :  FAILURE
 280  */
 281 static int __devinit bios32_present(const char __iomem *p)
 282 {
 283         struct bios32_service_dir *bios_32_ptr;
 284         int length;
 285         unsigned long map_entry, map_offset;
 286
 287         bios_32_ptr = (struct bios32_service_dir *) p;
 288
 289         /*
 290          * Search for signature by checking equal to the swizzled value
 291          * instead of calling another routine to perform a strcmp.
 292          */
 293         if (bios_32_ptr->signature == PCI_BIOS32_SD_VALUE) {
 294                 length = bios_32_ptr->length * PCI_BIOS32_PARAGRAPH_LEN;
 295                 if (bios_checksum(p, length)) {
 296                         /*
 297                          * According to the spec, we're looking for the
 298                          * first 4KB-aligned address below the entrypoint
 299                          * listed in the header. The Service Directory code
 300                          * is guaranteed to occupy no more than 2 4KB pages.
 301                          */
 302                         map_entry = bios_32_ptr->entry_point & ~(PAGE_SIZE - 1);
 303                         map_offset = bios_32_ptr->entry_point - map_entry;
 304
 305                         return cru_detect(map_entry, map_offset);
 306                 }
 307         }
 308         return -ENODEV;
 309 }
 310
 311 static int __devinit detect_cru_service(void)
 312 {
 313         char __iomem *p, *q;
 314         int rc = -1;
 315
 316         /*
 317          * Search from 0x0f0000 through 0x0fffff, inclusive.
 318          */
 319         p = ioremap(PCI_ROM_BASE1, ROM_SIZE);
 320         if (p == NULL)
 321                 return -ENOMEM;
 322
 323         for (q = p; q < p + ROM_SIZE; q += 16) {
 324                 rc = bios32_present(q);
 325                 if (!rc)
 326                         break;
 327         }
 328         iounmap(p);
 329         return rc;
 330 }
 331
 332 #else
 333 /* --64 Bit Bios------------------------------------------------------------ */
 334
 335 #define HPWDT_ARCH      64
 336
 337 asm(".text                      \n\t"
 338     ".align 4                   \n"
 339     "asminline_call:            \n\t"
 340     "pushq      %rbp            \n\t"
 341     "movq       %rsp, %rbp      \n\t"
 342     "pushq      %rax            \n\t"
 343     "pushq      %rbx            \n\t"
 344     "pushq      %rdx            \n\t"
 345     "pushq      %r12            \n\t"
 346     "pushq      %r9             \n\t"
 347     "movq       %rsi, %r12      \n\t"
 348     "movq       %rdi, %r9       \n\t"
 349     "movl       4(%r9),%ebx     \n\t"
 350     "movl       8(%r9),%ecx     \n\t"
 351     "movl       12(%r9),%edx    \n\t"
 352     "movl       16(%r9),%esi    \n\t"
 353     "movl       20(%r9),%edi    \n\t"
 354     "movl       (%r9),%eax      \n\t"
 355     "call       *%r12           \n\t"
 356     "pushfq                     \n\t"
 357     "popq        %r12           \n\t"
 358     "movl       %eax, (%r9)     \n\t"
 359     "movl       %ebx, 4(%r9)    \n\t"
 360     "movl       %ecx, 8(%r9)    \n\t"
 361     "movl       %edx, 12(%r9)   \n\t"
 362     "movl       %esi, 16(%r9)   \n\t"
 363     "movl       %edi, 20(%r9)   \n\t"
 364     "movq       %r12, %rax      \n\t"
 365     "movl       %eax, 28(%r9)   \n\t"
 366     "popq       %r9             \n\t"
 367     "popq       %r12            \n\t"
 368     "popq       %rdx            \n\t"
 369     "popq       %rbx            \n\t"
 370     "popq       %rax            \n\t"
 371     "leave                      \n\t"
 372     "ret                        \n\t"
 373     ".previous");
 374
 375 /*
 376  *      dmi_find_cru
 377  *
 378  *      Routine Description:
 379  *      This function checks whether or not a SMBIOS/DMI record is
 380  *      the 64bit CRU info or not
 381  */
 382 static void __devinit dmi_find_cru(const struct dmi_header *dm)
 383 {
 384         struct smbios_cru64_info *smbios_cru64_ptr;
 385         unsigned long cru_physical_address;
 386
 387         if (dm->type == SMBIOS_CRU64_INFORMATION) {
 388                 smbios_cru64_ptr = (struct smbios_cru64_info *) dm;
 389                 if (smbios_cru64_ptr->signature == CRU_BIOS_SIGNATURE_VALUE) {
 390                         cru_physical_address =
 391                                 smbios_cru64_ptr->physical_address +
 392                                 smbios_cru64_ptr->double_offset;
 393                         cru_rom_addr = ioremap(cru_physical_address,
 394                                 smbios_cru64_ptr->double_length);
 395                         set_memory_x((unsigned long)cru_rom_addr & PAGE_MASK,
 396                                 smbios_cru64_ptr->double_length >> PAGE_SHIFT);
 397                 }
 398         }
 399 }
 400
 401 static int __devinit detect_cru_service(void)
 402 {
 403         cru_rom_addr = NULL;
 404
 405         dmi_walk(dmi_find_cru);
 406
 407         /* if cru_rom_addr has been set then we found a CRU service */
 408         return ((cru_rom_addr != NULL) ? 0 : -ENODEV);
 409 }
 410
 411 /* ------------------------------------------------------------------------- */
 412
 413 #endif
 414
 415 /*
 416  *      Watchdog operations
 417  */
 418 static void hpwdt_start(void)
 419 {
 420         reload = (soft_margin * 1000) / 128;
 421         iowrite16(reload, hpwdt_timer_reg);
 422         iowrite16(0x85, hpwdt_timer_con);
 423 }
 424
 425 static void hpwdt_stop(void)
 426 {
 427         unsigned long data;
 428
 429         data = ioread16(hpwdt_timer_con);
 430         data &= 0xFE;
 431         iowrite16(data, hpwdt_timer_con);
 432 }
 433
 434 static void hpwdt_ping(void)
 435 {
 436         iowrite16(reload, hpwdt_timer_reg);
 437 }
 438
 439 static int hpwdt_change_timer(int new_margin)
 440 {
 441         /* Arbitrary, can't find the card's limits */
 442         if (new_margin < 30 || new_margin > 600) {
 443                 printk(KERN_WARNING
 444                         "hpwdt: New value passed in is invalid: %d seconds.\n",
 445                         new_margin);
 446                 return -EINVAL;
 447         }
 448
 449         soft_margin = new_margin;
 450         printk(KERN_DEBUG
 451                 "hpwdt: New timer passed in is %d seconds.\n",
 452                 new_margin);
 453         reload = (soft_margin * 1000) / 128;
 454
 455         return 0;
 456 }
 457
 458 /*
 459  *      NMI Handler
 460  */
 461 static int hpwdt_pretimeout(struct notifier_block *nb, unsigned long ulReason,
 462                                 void *data)
 463 {
 464         unsigned long rom_pl;
 465         static int die_nmi_called;
 466
 467         if (ulReason != DIE_NMI && ulReason != DIE_NMI_IPI)
 468                 return NOTIFY_OK;
 469
 470         spin_lock_irqsave(&rom_lock, rom_pl);
 471         if (!die_nmi_called)
 472                 asminline_call(&cmn_regs, cru_rom_addr);
 473         die_nmi_called = 1;
 474         spin_unlock_irqrestore(&rom_lock, rom_pl);
 475         if (cmn_regs.u1.ral == 0) {
 476                 printk(KERN_WARNING "hpwdt: An NMI occurred, "
 477                         "but unable to determine source.\n");
 478         } else {
 479                 if (allow_kdump)
 480                         hpwdt_stop();
 481                 panic("An NMI occurred, please see the Integrated "
 482                         "Management Log for details.\n");
 483         }
 484
 485         return NOTIFY_OK;
 486 }
 487
 488 /*
 489  *      /dev/watchdog handling
 490  */
 491 static int hpwdt_open(struct inode *inode, struct file *file)
 492 {
 493         /* /dev/watchdog can only be opened once */
 494         if (test_and_set_bit(0, &hpwdt_is_open))
 495                 return -EBUSY;
 496
 497         /* Start the watchdog */
 498         hpwdt_start();
 499         hpwdt_ping();
 500
 501         return nonseekable_open(inode, file);
 502 }
 503
 504 static int hpwdt_release(struct inode *inode, struct file *file)
 505 {
 506         /* Stop the watchdog */
 507         if (expect_release == 42) {
 508                 hpwdt_stop();
 509         } else {
 510                 printk(KERN_CRIT
 511                         "hpwdt: Unexpected close, not stopping watchdog!\n");
 512                 hpwdt_ping();
 513         }
 514
 515         expect_release = 0;
 516
 517         /* /dev/watchdog is being closed, make sure it can be re-opened */
 518         clear_bit(0, &hpwdt_is_open);
 519
 520         return 0;
 521 }
 522
 523 static ssize_t hpwdt_write(struct file *file, const char __user *data,
 524         size_t len, loff_t *ppos)
 525 {
 526         /* See if we got the magic character 'V' and reload the timer */
 527         if (len) {
 528                 if (!nowayout) {
 529                         size_t i;
 530
 531                         /* note: just in case someone wrote the magic character
 532                          * five months ago... */
 533                         expect_release = 0;
 534
 535                         /* scan to see whether or not we got the magic char. */
 536                         for (i = 0; i != len; i++) {
 537                                 char c;
 538                                 if (get_user(c, data + i))
 539                                         return -EFAULT;
 540                                 if (c == 'V')
 541                                         expect_release = 42;
 542                         }
 543                 }
 544
 545                 /* someone wrote to us, we should reload the timer */
 546                 hpwdt_ping();
 547         }
 548
 549         return len;
 550 }
 551
 552 static struct watchdog_info ident = {
 553         .options = WDIOF_SETTIMEOUT |
 554                    WDIOF_KEEPALIVEPING |
 555                    WDIOF_MAGICCLOSE,
 556         .identity = "HP iLO2 HW Watchdog Timer",
 557 };
 558
 559 static long hpwdt_ioctl(struct file *file, unsigned int cmd,
 560         unsigned long arg)
 561 {
 562         void __user *argp = (void __user *)arg;
 563         int __user *p = argp;
 564         int new_margin;
 565         int ret = -ENOTTY;
 566
 567         switch (cmd) {
 568         case WDIOC_GETSUPPORT:
 569                 ret = 0;
 570                 if (copy_to_user(argp, &ident, sizeof(ident)))
 571                         ret = -EFAULT;
 572                 break;
 573
 574         case WDIOC_GETSTATUS:
 575         case WDIOC_GETBOOTSTATUS:
 576                 ret = put_user(0, p);
 577                 break;
 578
 579         case WDIOC_KEEPALIVE:
 580                 hpwdt_ping();
 581                 ret = 0;
 582                 break;
 583
 584         case WDIOC_SETTIMEOUT:
 585                 ret = get_user(new_margin, p);
 586                 if (ret)
 587                         break;
 588
 589                 ret = hpwdt_change_timer(new_margin);
 590                 if (ret)
 591                         break;
 592
 593                 hpwdt_ping();
 594                 /* Fall */
 595         case WDIOC_GETTIMEOUT:
 596                 ret = put_user(soft_margin, p);
 597                 break;
 598         }
 599         return ret;
 600 }
 601
 602 /*
 603  *      Kernel interfaces
 604  */
 605 static struct file_operations hpwdt_fops = {
 606         .owner = THIS_MODULE,
 607         .llseek = no_llseek,
 608         .write = hpwdt_write,
 609         .unlocked_ioctl = hpwdt_ioctl,
 610         .open = hpwdt_open,
 611         .release = hpwdt_release,
 612 };
 613
 614 static struct miscdevice hpwdt_miscdev = {
 615         .minor = WATCHDOG_MINOR,
 616         .name = "watchdog",
 617         .fops = &hpwdt_fops,
 618 };
 619
 620 static struct notifier_block die_notifier = {
 621         .notifier_call = hpwdt_pretimeout,
 622         .priority = 0x7FFFFFFF,
 623 };
 624
 625 /*
 626  *      Init & Exit
 627  */
 628
 629 static int __devinit hpwdt_init_one(struct pci_dev *dev,
 630                                         const struct pci_device_id *ent)
 631 {
 632         int retval;
 633
 634         /*
 635          * First let's find out if we are on an iLO2 server. We will
 636          * not run on a legacy ASM box.
 637          * So we only support the G5 ProLiant servers and higher.
 638          */
 639         if (dev->subsystem_vendor != PCI_VENDOR_ID_HP) {
 640                 dev_warn(&dev->dev,
 641                         "This server does not have an iLO2 ASIC.\n");
 642                 return -ENODEV;
 643         }
 644
 645         if (pci_enable_device(dev)) {
 646                 dev_warn(&dev->dev,
 647                         "Not possible to enable PCI Device: 0x%x:0x%x.\n",
 648                         ent->vendor, ent->device);
 649                 return -ENODEV;
 650         }
 651
 652         pci_mem_addr = pci_iomap(dev, 1, 0x80);
 653         if (!pci_mem_addr) {
 654                 dev_warn(&dev->dev,
 655                         "Unable to detect the iLO2 server memory.\n");
 656                 retval = -ENOMEM;
 657                 goto error_pci_iomap;
 658         }
 659         hpwdt_timer_reg = pci_mem_addr + 0x70;
 660         hpwdt_timer_con = pci_mem_addr + 0x72;
 661
 662         /* Make sure that we have a valid soft_margin */
 663         if (hpwdt_change_timer(soft_margin))
 664                 hpwdt_change_timer(DEFAULT_MARGIN);
 665
 666         /*
 667          * We need to map the ROM to get the CRU service.
 668          * For 32 bit Operating Systems we need to go through the 32 Bit
 669          * BIOS Service Directory
 670          * For 64 bit Operating Systems we get that service through SMBIOS.
 671          */
 672         retval = detect_cru_service();
 673         if (retval < 0) {
 674                 dev_warn(&dev->dev,
 675                         "Unable to detect the %d Bit CRU Service.\n",
 676                         HPWDT_ARCH);
 677                 goto error_get_cru;
 678         }
 679
 680         /*
 681          * We know this is the only CRU call we need to make so lets keep as
 682          * few instructions as possible once the NMI comes in.
 683          */
 684         cmn_regs.u1.rah = 0x0D;
 685         cmn_regs.u1.ral = 0x02;
 686
 687         retval = register_die_notifier(&die_notifier);
 688         if (retval != 0) {
 689                 dev_warn(&dev->dev,
 690                         "Unable to register a die notifier (err=%d).\n",
 691                         retval);
 692                 goto error_die_notifier;
 693         }
 694
 695         retval = misc_register(&hpwdt_miscdev);
 696         if (retval < 0) {
 697                 dev_warn(&dev->dev,
 698                         "Unable to register miscdev on minor=%d (err=%d).\n",
 699                         WATCHDOG_MINOR, retval);
 700                 goto error_misc_register;
 701         }
 702
 703         printk(KERN_INFO
 704                 "hp Watchdog Timer Driver: %s"
 705                 ", timer margin: %d seconds (nowayout=%d)"
 706                 ", allow kernel dump: %s (default = 0/OFF).\n",
 707                 HPWDT_VERSION, soft_margin, nowayout,
 708                 (allow_kdump == 0) ? "OFF" : "ON");
 709
 710         return 0;
 711
 712 error_misc_register:
 713         unregister_die_notifier(&die_notifier);
 714 error_die_notifier:
 715         if (cru_rom_addr)
 716                 iounmap(cru_rom_addr);
 717 error_get_cru:
 718         pci_iounmap(dev, pci_mem_addr);
 719 error_pci_iomap:
 720         pci_disable_device(dev);
 721         return retval;
 722 }
 723
 724 static void __devexit hpwdt_exit(struct pci_dev *dev)
 725 {
 726         if (!nowayout)
 727                 hpwdt_stop();
 728
 729         misc_deregister(&hpwdt_miscdev);
 730         unregister_die_notifier(&die_notifier);
 731
 732         if (cru_rom_addr)
 733                 iounmap(cru_rom_addr);
 734         pci_iounmap(dev, pci_mem_addr);
 735         pci_disable_device(dev);
 736 }
 737
 738 static struct pci_driver hpwdt_driver = {
 739         .name = "hpwdt",
 740         .id_table = hpwdt_devices,
 741         .probe = hpwdt_init_one,
 742         .remove = __devexit_p(hpwdt_exit),
 743 };
 744
 745 static void __exit hpwdt_cleanup(void)
 746 {
 747         pci_unregister_driver(&hpwdt_driver);
 748 }
 749
 750 static int __init hpwdt_init(void)
 751 {
 752         return pci_register_driver(&hpwdt_driver);
 753 }
 754
 755 MODULE_AUTHOR("Tom Mingarelli");
 756 MODULE_DESCRIPTION("hp watchdog driver");
 757 MODULE_LICENSE("GPL");
 758 MODULE_VERSION(HPWDT_VERSION);
 759 MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
 760
 761 module_param(soft_margin, int, 0);
 762 MODULE_PARM_DESC(soft_margin, "Watchdog timeout in seconds");
 763
 764 module_param(allow_kdump, int, 0);
 765 MODULE_PARM_DESC(allow_kdump, "Start a kernel dump after NMI occurs");
 766
 767 module_param(nowayout, int, 0);
 768 MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default="
 769                 __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
 770
 771 module_init(hpwdt_init);
 772 module_exit(hpwdt_cleanup);