git.oblomov.eu Git - linux-2.6/blob - drivers/watchdog/hpwdt.c

   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
  44 #define PCI_BIOS32_SD_VALUE             0x5F32335F      /* "_32_" */
  45 #define CRU_BIOS_SIGNATURE_VALUE        0x55524324
  46 #define PCI_BIOS32_PARAGRAPH_LEN        16
  47 #define PCI_ROM_BASE1                   0x000F0000
  48 #define ROM_SIZE                        0x10000
  49
  50 struct bios32_service_dir {
  51         u32 signature;
  52         u32 entry_point;
  53         u8 revision;
  54         u8 length;
  55         u8 checksum;
  56         u8 reserved[5];
  57 };
  58
  59 /* type 212 */
  60 struct smbios_cru64_info {
  61         u8 type;
  62         u8 byte_length;
  63         u16 handle;
  64         u32 signature;
  65         u64 physical_address;
  66         u32 double_length;
  67         u32 double_offset;
  68 };
  69 #define SMBIOS_CRU64_INFORMATION        212
  70
  71 struct cmn_registers {
  72         union {
  73                 struct {
  74                         u8 ral;
  75                         u8 rah;
  76                         u16 rea2;
  77                 };
  78                 u32 reax;
  79         } u1;
  80         union {
  81                 struct {
  82                         u8 rbl;
  83                         u8 rbh;
  84                         u8 reb2l;
  85                         u8 reb2h;
  86                 };
  87                 u32 rebx;
  88         } u2;
  89         union {
  90                 struct {
  91                         u8 rcl;
  92                         u8 rch;
  93                         u16 rec2;
  94                 };
  95                 u32 recx;
  96         } u3;
  97         union {
  98                 struct {
  99                         u8 rdl;
 100                         u8 rdh;
 101                         u16 red2;
 102                 };
 103                 u32 redx;
 104         } u4;
 105
 106         u32 resi;
 107         u32 redi;
 108         u16 rds;
 109         u16 res;
 110         u32 reflags;
 111 }  __attribute__((packed));
 112
 113 #define DEFAULT_MARGIN  30
 114 static unsigned int soft_margin = DEFAULT_MARGIN;       /* in seconds */
 115 static unsigned int reload;                     /* the computed soft_margin */
 116 static int nowayout = WATCHDOG_NOWAYOUT;
 117 static char expect_release;
 118 static unsigned long hpwdt_is_open;
 119
 120 static void __iomem *pci_mem_addr;              /* the PCI-memory address */
 121 static unsigned long __iomem *hpwdt_timer_reg;
 122 static unsigned long __iomem *hpwdt_timer_con;
 123
 124 static DEFINE_SPINLOCK(rom_lock);
 125
 126 static void *cru_rom_addr;
 127
 128 static struct cmn_registers cmn_regs;
 129
 130 static struct pci_device_id hpwdt_devices[] = {
 131         {
 132          .vendor = PCI_VENDOR_ID_COMPAQ,
 133          .device = 0xB203,
 134          .subvendor = PCI_ANY_ID,
 135          .subdevice = PCI_ANY_ID,
 136         },
 137         {0},                    /* terminate list */
 138 };
 139 MODULE_DEVICE_TABLE(pci, hpwdt_devices);
 140
 141 extern asmlinkage void asminline_call(struct cmn_registers *pi86Regs, unsigned long *pRomEntry);
 142
 143 #ifndef CONFIG_X86_64
 144 /* --32 Bit Bios------------------------------------------------------------ */
 145
 146 #define HPWDT_ARCH      32
 147
 148 asm(".text                          \n\t"
 149     ".align 4                       \n"
 150     "asminline_call:                \n\t"
 151     "pushl       %ebp               \n\t"
 152     "movl        %esp, %ebp         \n\t"
 153     "pusha                          \n\t"
 154     "pushf                          \n\t"
 155     "push        %es                \n\t"
 156     "push        %ds                \n\t"
 157     "pop         %es                \n\t"
 158     "movl        8(%ebp),%eax       \n\t"
 159     "movl        4(%eax),%ebx       \n\t"
 160     "movl        8(%eax),%ecx       \n\t"
 161     "movl        12(%eax),%edx      \n\t"
 162     "movl        16(%eax),%esi      \n\t"
 163     "movl        20(%eax),%edi      \n\t"
 164     "movl        (%eax),%eax        \n\t"
 165     "push        %cs                \n\t"
 166     "call        *12(%ebp)          \n\t"
 167     "pushf                          \n\t"
 168     "pushl       %eax               \n\t"
 169     "movl        8(%ebp),%eax       \n\t"
 170     "movl        %ebx,4(%eax)       \n\t"
 171     "movl        %ecx,8(%eax)       \n\t"
 172     "movl        %edx,12(%eax)      \n\t"
 173     "movl        %esi,16(%eax)      \n\t"
 174     "movl        %edi,20(%eax)      \n\t"
 175     "movw        %ds,24(%eax)       \n\t"
 176     "movw        %es,26(%eax)       \n\t"
 177     "popl        %ebx               \n\t"
 178     "movl        %ebx,(%eax)        \n\t"
 179     "popl        %ebx               \n\t"
 180     "movl        %ebx,28(%eax)      \n\t"
 181     "pop         %es                \n\t"
 182     "popf                           \n\t"
 183     "popa                           \n\t"
 184     "leave                          \n\t"
 185     "ret                            \n\t"
 186     ".previous");
 187
 188
 189 /*
 190  *      cru_detect
 191  *
 192  *      Routine Description:
 193  *      This function uses the 32-bit BIOS Service Directory record to
 194  *      search for a $CRU record.
 195  *
 196  *      Return Value:
 197  *      0        :  SUCCESS
 198  *      <0       :  FAILURE
 199  */
 200 static int __devinit cru_detect(unsigned long map_entry,
 201         unsigned long map_offset)
 202 {
 203         void *bios32_map;
 204         unsigned long *bios32_entrypoint;
 205         unsigned long cru_physical_address;
 206         unsigned long cru_length;
 207         unsigned long physical_bios_base = 0;
 208         unsigned long physical_bios_offset = 0;
 209         int retval = -ENODEV;
 210
 211         bios32_map = ioremap(map_entry, (2 * PAGE_SIZE));
 212
 213         if (bios32_map == NULL)
 214                 return -ENODEV;
 215
 216         bios32_entrypoint = bios32_map + map_offset;
 217
 218         cmn_regs.u1.reax = CRU_BIOS_SIGNATURE_VALUE;
 219
 220         asminline_call(&cmn_regs, bios32_entrypoint);
 221
 222         if (cmn_regs.u1.ral != 0) {
 223                 printk(KERN_WARNING
 224                        "hpwdt: Call succeeded but with an error: 0x%x\n",
 225                        cmn_regs.u1.ral);
 226         } else {
 227                 physical_bios_base = cmn_regs.u2.rebx;
 228                 physical_bios_offset = cmn_regs.u4.redx;
 229                 cru_length = cmn_regs.u3.recx;
 230                 cru_physical_address =
 231                     physical_bios_base + physical_bios_offset;
 232
 233                 /* If the values look OK, then map it in. */
 234                 if ((physical_bios_base + physical_bios_offset)) {
 235                         cru_rom_addr =
 236                             ioremap(cru_physical_address, cru_length);
 237                         if (cru_rom_addr)
 238                                 retval = 0;
 239                 }
 240
 241                 printk(KERN_DEBUG "hpwdt: CRU Base Address:   0x%lx\n",
 242                         physical_bios_base);
 243                 printk(KERN_DEBUG "hpwdt: CRU Offset Address: 0x%lx\n",
 244                         physical_bios_offset);
 245                 printk(KERN_DEBUG "hpwdt: CRU Length:         0x%lx\n",
 246                         cru_length);
 247                 printk(KERN_DEBUG "hpwdt: CRU Mapped Address: 0x%x\n",
 248                         (unsigned int)&cru_rom_addr);
 249         }
 250         iounmap(bios32_map);
 251         return retval;
 252 }
 253
 254 /*
 255  *      bios_checksum
 256  */
 257 static int __devinit bios_checksum(const char __iomem *ptr, int len)
 258 {
 259         char sum = 0;
 260         int i;
 261
 262         /*
 263          * calculate checksum of size bytes. This should add up
 264          * to zero if we have a valid header.
 265          */
 266         for (i = 0; i < len; i++)
 267                 sum += ptr[i];
 268
 269         return ((sum == 0) && (len > 0));
 270 }
 271
 272 /*
 273  *      bios32_present
 274  *
 275  *      Routine Description:
 276  *      This function finds the 32-bit BIOS Service Directory
 277  *
 278  *      Return Value:
 279  *      0        :  SUCCESS
 280  *      <0       :  FAILURE
 281  */
 282 static int __devinit bios32_present(const char __iomem *p)
 283 {
 284         struct bios32_service_dir *bios_32_ptr;
 285         int length;
 286         unsigned long map_entry, map_offset;
 287
 288         bios_32_ptr = (struct bios32_service_dir *) p;
 289
 290         /*
 291          * Search for signature by checking equal to the swizzled value
 292          * instead of calling another routine to perform a strcmp.
 293          */
 294         if (bios_32_ptr->signature == PCI_BIOS32_SD_VALUE) {
 295                 length = bios_32_ptr->length * PCI_BIOS32_PARAGRAPH_LEN;
 296                 if (bios_checksum(p, length)) {
 297                         /*
 298                          * According to the spec, we're looking for the
 299                          * first 4KB-aligned address below the entrypoint
 300                          * listed in the header. The Service Directory code
 301                          * is guaranteed to occupy no more than 2 4KB pages.
 302                          */
 303                         map_entry = bios_32_ptr->entry_point & ~(PAGE_SIZE - 1);
 304                         map_offset = bios_32_ptr->entry_point - map_entry;
 305
 306                         return cru_detect(map_entry, map_offset);
 307                 }
 308         }
 309         return -ENODEV;
 310 }
 311
 312 static int __devinit detect_cru_service(void)
 313 {
 314         char __iomem *p, *q;
 315         int rc = -1;
 316
 317         /*
 318          * Search from 0x0f0000 through 0x0fffff, inclusive.
 319          */
 320         p = ioremap(PCI_ROM_BASE1, ROM_SIZE);
 321         if (p == NULL)
 322                 return -ENOMEM;
 323
 324         for (q = p; q < p + ROM_SIZE; q += 16) {
 325                 rc = bios32_present(q);
 326                 if (!rc)
 327                         break;
 328         }
 329         iounmap(p);
 330         return rc;
 331 }
 332
 333 #else
 334 /* --64 Bit Bios------------------------------------------------------------ */
 335
 336 #define HPWDT_ARCH      64
 337
 338 asm(".text                      \n\t"
 339     ".align 4                   \n"
 340     "asminline_call:            \n\t"
 341     "pushq      %rbp            \n\t"
 342     "movq       %rsp, %rbp      \n\t"
 343     "pushq      %rax            \n\t"
 344     "pushq      %rbx            \n\t"
 345     "pushq      %rdx            \n\t"
 346     "pushq      %r12            \n\t"
 347     "pushq      %r9             \n\t"
 348     "movq       %rsi, %r12      \n\t"
 349     "movq       %rdi, %r9       \n\t"
 350     "movl       4(%r9),%ebx     \n\t"
 351     "movl       8(%r9),%ecx     \n\t"
 352     "movl       12(%r9),%edx    \n\t"
 353     "movl       16(%r9),%esi    \n\t"
 354     "movl       20(%r9),%edi    \n\t"
 355     "movl       (%r9),%eax      \n\t"
 356     "call       *%r12           \n\t"
 357     "pushfq                     \n\t"
 358     "popq        %r12           \n\t"
 359     "popfq                      \n\t"
 360     "movl       %eax, (%r9)     \n\t"
 361     "movl       %ebx, 4(%r9)    \n\t"
 362     "movl       %ecx, 8(%r9)    \n\t"
 363     "movl       %edx, 12(%r9)   \n\t"
 364     "movl       %esi, 16(%r9)   \n\t"
 365     "movl       %edi, 20(%r9)   \n\t"
 366     "movq       %r12, %rax      \n\t"
 367     "movl       %eax, 28(%r9)   \n\t"
 368     "popq       %r9             \n\t"
 369     "popq       %r12            \n\t"
 370     "popq       %rdx            \n\t"
 371     "popq       %rbx            \n\t"
 372     "popq       %rax            \n\t"
 373     "leave                      \n\t"
 374     "ret                        \n\t"
 375     ".previous");
 376
 377 /*
 378  *      dmi_find_cru
 379  *
 380  *      Routine Description:
 381  *      This function checks whether or not a SMBIOS/DMI record is
 382  *      the 64bit CRU info or not
 383  */
 384 static void __devinit dmi_find_cru(const struct dmi_header *dm)
 385 {
 386         struct smbios_cru64_info *smbios_cru64_ptr;
 387         unsigned long cru_physical_address;
 388
 389         if (dm->type == SMBIOS_CRU64_INFORMATION) {
 390                 smbios_cru64_ptr = (struct smbios_cru64_info *) dm;
 391                 if (smbios_cru64_ptr->signature == CRU_BIOS_SIGNATURE_VALUE) {
 392                         cru_physical_address =
 393                             smbios_cru64_ptr->physical_address +
 394                             smbios_cru64_ptr->double_offset;
 395                         cru_rom_addr = ioremap(cru_physical_address,
 396                                     smbios_cru64_ptr->double_length);
 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  *      NMI Handler
 417  */
 418 static int hpwdt_pretimeout(struct notifier_block *nb, unsigned long ulReason,
 419                             void *data)
 420 {
 421         unsigned long rom_pl;
 422         static int die_nmi_called;
 423
 424         if (ulReason != DIE_NMI && ulReason != DIE_NMI_IPI)
 425                 return NOTIFY_OK;
 426
 427         spin_lock_irqsave(&rom_lock, rom_pl);
 428         if (!die_nmi_called)
 429                 asminline_call(&cmn_regs, cru_rom_addr);
 430         die_nmi_called = 1;
 431         spin_unlock_irqrestore(&rom_lock, rom_pl);
 432         if (cmn_regs.u1.ral == 0) {
 433                 printk(KERN_WARNING "hpwdt: An NMI occurred, "
 434                        "but unable to determine source.\n");
 435         } else {
 436                 panic("An NMI occurred, please see the Integrated "
 437                         "Management Log for details.\n");
 438         }
 439
 440         return NOTIFY_STOP;
 441 }
 442
 443 /*
 444  *      Watchdog operations
 445  */
 446 static void hpwdt_start(void)
 447 {
 448         reload = (soft_margin * 1000) / 128;
 449         iowrite16(reload, hpwdt_timer_reg);
 450         iowrite16(0x85, hpwdt_timer_con);
 451 }
 452
 453 static void hpwdt_stop(void)
 454 {
 455         unsigned long data;
 456
 457         data = ioread16(hpwdt_timer_con);
 458         data &= 0xFE;
 459         iowrite16(data, hpwdt_timer_con);
 460 }
 461
 462 static void hpwdt_ping(void)
 463 {
 464         iowrite16(reload, hpwdt_timer_reg);
 465 }
 466
 467 static int hpwdt_change_timer(int new_margin)
 468 {
 469         /* Arbitrary, can't find the card's limits */
 470         if (new_margin < 30 || new_margin > 600) {
 471                 printk(KERN_WARNING
 472                         "hpwdt: New value passed in is invalid: %d seconds.\n",
 473                         new_margin);
 474                 return -EINVAL;
 475         }
 476
 477         soft_margin = new_margin;
 478         printk(KERN_DEBUG
 479                 "hpwdt: New timer passed in is %d seconds.\n",
 480                 new_margin);
 481         reload = (soft_margin * 1000) / 128;
 482
 483         return 0;
 484 }
 485
 486 /*
 487  *      /dev/watchdog handling
 488  */
 489 static int hpwdt_open(struct inode *inode, struct file *file)
 490 {
 491         /* /dev/watchdog can only be opened once */
 492         if (test_and_set_bit(0, &hpwdt_is_open))
 493                 return -EBUSY;
 494
 495         /* Start the watchdog */
 496         hpwdt_start();
 497         hpwdt_ping();
 498
 499         return nonseekable_open(inode, file);
 500 }
 501
 502 static int hpwdt_release(struct inode *inode, struct file *file)
 503 {
 504         /* Stop the watchdog */
 505         if (expect_release == 42) {
 506                 hpwdt_stop();
 507         } else {
 508                 printk(KERN_CRIT
 509                         "hpwdt: Unexpected close, not stopping watchdog!\n");
 510                 hpwdt_ping();
 511         }
 512
 513         expect_release = 0;
 514
 515         /* /dev/watchdog is being closed, make sure it can be re-opened */
 516         clear_bit(0, &hpwdt_is_open);
 517
 518         return 0;
 519 }
 520
 521 static ssize_t hpwdt_write(struct file *file, const char __user *data,
 522         size_t len, loff_t *ppos)
 523 {
 524         /* See if we got the magic character 'V' and reload the timer */
 525         if (len) {
 526                 if (!nowayout) {
 527                         size_t i;
 528
 529                         /* note: just in case someone wrote the magic character
 530                          * five months ago... */
 531                         expect_release = 0;
 532
 533                         /* scan to see whether or not we got the magic char. */
 534                         for (i = 0; i != len; i++) {
 535                                 char c;
 536                                 if (get_user(c, data+i))
 537                                         return -EFAULT;
 538                                 if (c == 'V')
 539                                         expect_release = 42;
 540                         }
 541                 }
 542
 543                 /* someone wrote to us, we should reload the timer */
 544                 hpwdt_ping();
 545         }
 546
 547         return len;
 548 }
 549
 550 static struct watchdog_info ident = {
 551         .options = WDIOF_SETTIMEOUT |
 552                    WDIOF_KEEPALIVEPING |
 553                    WDIOF_MAGICCLOSE,
 554         .identity = "HP iLO2 HW Watchdog Timer",
 555 };
 556
 557 static long hpwdt_ioctl(struct file *file, unsigned int cmd,
 558         unsigned long arg)
 559 {
 560         void __user *argp = (void __user *)arg;
 561         int __user *p = argp;
 562         int new_margin;
 563         int ret = -ENOTTY;
 564
 565         switch (cmd) {
 566         case WDIOC_GETSUPPORT:
 567                 ret = 0;
 568                 if (copy_to_user(argp, &ident, sizeof(ident)))
 569                         ret = -EFAULT;
 570                 break;
 571
 572         case WDIOC_GETSTATUS:
 573         case WDIOC_GETBOOTSTATUS:
 574                 ret = put_user(0, p);
 575                 break;
 576
 577         case WDIOC_KEEPALIVE:
 578                 hpwdt_ping();
 579                 ret = 0;
 580                 break;
 581
 582         case WDIOC_SETTIMEOUT:
 583                 ret = get_user(new_margin, p);
 584                 if (ret)
 585                         break;
 586
 587                 ret = hpwdt_change_timer(new_margin);
 588                 if (ret)
 589                         break;
 590
 591                 hpwdt_ping();
 592                 /* Fall */
 593         case WDIOC_GETTIMEOUT:
 594                 ret = put_user(soft_margin, p);
 595                 break;
 596         }
 597         return ret;
 598 }
 599
 600 /*
 601  *      Kernel interfaces
 602  */
 603 static struct file_operations hpwdt_fops = {
 604         .owner = THIS_MODULE,
 605         .llseek = no_llseek,
 606         .write = hpwdt_write,
 607         .unlocked_ioctl = hpwdt_ioctl,
 608         .open = hpwdt_open,
 609         .release = hpwdt_release,
 610 };
 611
 612 static struct miscdevice hpwdt_miscdev = {
 613         .minor = WATCHDOG_MINOR,
 614         .name = "watchdog",
 615         .fops = &hpwdt_fops,
 616 };
 617
 618 static struct notifier_block die_notifier = {
 619         .notifier_call = hpwdt_pretimeout,
 620         .priority = 0x7FFFFFFF,
 621 };
 622
 623 /*
 624  *      Init & Exit
 625  */
 626
 627 static int __devinit hpwdt_init_one(struct pci_dev *dev,
 628                                     const struct pci_device_id *ent)
 629 {
 630         int retval;
 631
 632         /*
 633          * First let's find out if we are on an iLO2 server. We will
 634          * not run on a legacy ASM box.
 635          */
 636         if (dev->subsystem_vendor != PCI_VENDOR_ID_HP) {
 637                 dev_warn(&dev->dev,
 638                        "This server does not have an iLO2 ASIC.\n");
 639                 return -ENODEV;
 640         }
 641
 642         if (pci_enable_device(dev)) {
 643                 dev_warn(&dev->dev,
 644                         "Not possible to enable PCI Device: 0x%x:0x%x.\n",
 645                         ent->vendor, ent->device);
 646                 return -ENODEV;
 647         }
 648
 649         pci_mem_addr = pci_iomap(dev, 1, 0x80);
 650         if (!pci_mem_addr) {
 651                 dev_warn(&dev->dev,
 652                         "Unable to detect the iLO2 server memory.\n");
 653                 retval = -ENOMEM;
 654                 goto error_pci_iomap;
 655         }
 656         hpwdt_timer_reg = pci_mem_addr + 0x70;
 657         hpwdt_timer_con = pci_mem_addr + 0x72;
 658
 659         /* Make sure that we have a valid soft_margin */
 660         if (hpwdt_change_timer(soft_margin))
 661                 hpwdt_change_timer(DEFAULT_MARGIN);
 662
 663         /*
 664          * We need to map the ROM to get the CRU service.
 665          * For 32 bit Operating Systems we need to go through the 32 Bit
 666          * BIOS Service Directory
 667          * For 64 bit Operating Systems we get that service through SMBIOS.
 668          */
 669         retval = detect_cru_service();
 670         if (retval < 0) {
 671                 dev_warn(&dev->dev,
 672                        "Unable to detect the %d Bit CRU Service.\n",
 673                         HPWDT_ARCH);
 674                 goto error_get_cru;
 675         }
 676
 677         /*
 678          * We know this is the only CRU call we need to make so lets keep as
 679          * few instructions as possible once the NMI comes in.
 680          */
 681         cmn_regs.u1.rah = 0x0D;
 682         cmn_regs.u1.ral = 0x02;
 683
 684         retval = register_die_notifier(&die_notifier);
 685         if (retval != 0) {
 686                 dev_warn(&dev->dev,
 687                        "Unable to register a die notifier (err=%d).\n",
 688                         retval);
 689                 goto error_die_notifier;
 690         }
 691
 692         retval = misc_register(&hpwdt_miscdev);
 693         if (retval < 0) {
 694                 dev_warn(&dev->dev,
 695                         "Unable to register miscdev on minor=%d (err=%d).\n",
 696                         WATCHDOG_MINOR, retval);
 697                 goto error_misc_register;
 698         }
 699
 700         printk(KERN_INFO
 701                 "hp Watchdog Timer Driver: 1.00"
 702                 ", timer margin: %d seconds( nowayout=%d).\n",
 703                 soft_margin, nowayout);
 704
 705         return 0;
 706
 707 error_misc_register:
 708         unregister_die_notifier(&die_notifier);
 709 error_die_notifier:
 710         if (cru_rom_addr)
 711                 iounmap(cru_rom_addr);
 712 error_get_cru:
 713         pci_iounmap(dev, pci_mem_addr);
 714 error_pci_iomap:
 715         pci_disable_device(dev);
 716         return retval;
 717 }
 718
 719 static void __devexit hpwdt_exit(struct pci_dev *dev)
 720 {
 721         if (!nowayout)
 722                 hpwdt_stop();
 723
 724         misc_deregister(&hpwdt_miscdev);
 725         unregister_die_notifier(&die_notifier);
 726
 727         if (cru_rom_addr)
 728                 iounmap(cru_rom_addr);
 729         pci_iounmap(dev, pci_mem_addr);
 730         pci_disable_device(dev);
 731 }
 732
 733 static struct pci_driver hpwdt_driver = {
 734         .name = "hpwdt",
 735         .id_table = hpwdt_devices,
 736         .probe = hpwdt_init_one,
 737         .remove = __devexit_p(hpwdt_exit),
 738 };
 739
 740 static void __exit hpwdt_cleanup(void)
 741 {
 742         pci_unregister_driver(&hpwdt_driver);
 743 }
 744
 745 static int __init hpwdt_init(void)
 746 {
 747         return pci_register_driver(&hpwdt_driver);
 748 }
 749
 750 MODULE_AUTHOR("Tom Mingarelli");
 751 MODULE_DESCRIPTION("hp watchdog driver");
 752 MODULE_LICENSE("GPL");
 753 MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
 754
 755 module_param(soft_margin, int, 0);
 756 MODULE_PARM_DESC(soft_margin, "Watchdog timeout in seconds");
 757
 758 module_param(nowayout, int, 0);
 759 MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default="
 760                 __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
 761
 762 module_init(hpwdt_init);
 763 module_exit(hpwdt_cleanup);