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 #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,
 141                                                 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     "movl       %eax, (%r9)     \n\t"
 360     "movl       %ebx, 4(%r9)    \n\t"
 361     "movl       %ecx, 8(%r9)    \n\t"
 362     "movl       %edx, 12(%r9)   \n\t"
 363     "movl       %esi, 16(%r9)   \n\t"
 364     "movl       %edi, 20(%r9)   \n\t"
 365     "movq       %r12, %rax      \n\t"
 366     "movl       %eax, 28(%r9)   \n\t"
 367     "popq       %r9             \n\t"
 368     "popq       %r12            \n\t"
 369     "popq       %rdx            \n\t"
 370     "popq       %rbx            \n\t"
 371     "popq       %rax            \n\t"
 372     "leave                      \n\t"
 373     "ret                        \n\t"
 374     ".previous");
 375
 376 /*
 377  *      dmi_find_cru
 378  *
 379  *      Routine Description:
 380  *      This function checks whether or not a SMBIOS/DMI record is
 381  *      the 64bit CRU info or not
 382  */
 383 static void __devinit dmi_find_cru(const struct dmi_header *dm)
 384 {
 385         struct smbios_cru64_info *smbios_cru64_ptr;
 386         unsigned long cru_physical_address;
 387
 388         if (dm->type == SMBIOS_CRU64_INFORMATION) {
 389                 smbios_cru64_ptr = (struct smbios_cru64_info *) dm;
 390                 if (smbios_cru64_ptr->signature == CRU_BIOS_SIGNATURE_VALUE) {
 391                         cru_physical_address =
 392                                 smbios_cru64_ptr->physical_address +
 393                                 smbios_cru64_ptr->double_offset;
 394                         cru_rom_addr = ioremap(cru_physical_address,
 395                                 smbios_cru64_ptr->double_length);
 396                         set_memory_x((unsigned long)cru_rom_addr & PAGE_MASK,
 397                                 smbios_cru64_ptr->double_length >> PAGE_SHIFT);
 398                 }
 399         }
 400 }
 401
 402 static int __devinit detect_cru_service(void)
 403 {
 404         cru_rom_addr = NULL;
 405
 406         dmi_walk(dmi_find_cru);
 407
 408         /* if cru_rom_addr has been set then we found a CRU service */
 409         return ((cru_rom_addr != NULL) ? 0 : -ENODEV);
 410 }
 411
 412 /* ------------------------------------------------------------------------- */
 413
 414 #endif
 415
 416 /*
 417  *      Watchdog operations
 418  */
 419 static void hpwdt_start(void)
 420 {
 421         reload = (soft_margin * 1000) / 128;
 422         iowrite16(reload, hpwdt_timer_reg);
 423         iowrite16(0x85, hpwdt_timer_con);
 424 }
 425
 426 static void hpwdt_stop(void)
 427 {
 428         unsigned long data;
 429
 430         data = ioread16(hpwdt_timer_con);
 431         data &= 0xFE;
 432         iowrite16(data, hpwdt_timer_con);
 433 }
 434
 435 static void hpwdt_ping(void)
 436 {
 437         iowrite16(reload, hpwdt_timer_reg);
 438 }
 439
 440 static int hpwdt_change_timer(int new_margin)
 441 {
 442         /* Arbitrary, can't find the card's limits */
 443         if (new_margin < 30 || new_margin > 600) {
 444                 printk(KERN_WARNING
 445                         "hpwdt: New value passed in is invalid: %d seconds.\n",
 446                         new_margin);
 447                 return -EINVAL;
 448         }
 449
 450         soft_margin = new_margin;
 451         printk(KERN_DEBUG
 452                 "hpwdt: New timer passed in is %d seconds.\n",
 453                 new_margin);
 454         reload = (soft_margin * 1000) / 128;
 455
 456         return 0;
 457 }
 458
 459 /*
 460  *      NMI Handler
 461  */
 462 static int hpwdt_pretimeout(struct notifier_block *nb, unsigned long ulReason,
 463                                 void *data)
 464 {
 465         unsigned long rom_pl;
 466         static int die_nmi_called;
 467
 468         if (ulReason != DIE_NMI && ulReason != DIE_NMI_IPI)
 469                 return NOTIFY_OK;
 470
 471         spin_lock_irqsave(&rom_lock, rom_pl);
 472         if (!die_nmi_called)
 473                 asminline_call(&cmn_regs, cru_rom_addr);
 474         die_nmi_called = 1;
 475         spin_unlock_irqrestore(&rom_lock, rom_pl);
 476         if (cmn_regs.u1.ral == 0) {
 477                 printk(KERN_WARNING "hpwdt: An NMI occurred, "
 478                         "but unable to determine source.\n");
 479         } else {
 480                 if (allow_kdump)
 481                         hpwdt_stop();
 482                 panic("An NMI occurred, please see the Integrated "
 483                         "Management Log for details.\n");
 484         }
 485
 486         return NOTIFY_OK;
 487 }
 488
 489 /*
 490  *      /dev/watchdog handling
 491  */
 492 static int hpwdt_open(struct inode *inode, struct file *file)
 493 {
 494         /* /dev/watchdog can only be opened once */
 495         if (test_and_set_bit(0, &hpwdt_is_open))
 496                 return -EBUSY;
 497
 498         /* Start the watchdog */
 499         hpwdt_start();
 500         hpwdt_ping();
 501
 502         return nonseekable_open(inode, file);
 503 }
 504
 505 static int hpwdt_release(struct inode *inode, struct file *file)
 506 {
 507         /* Stop the watchdog */
 508         if (expect_release == 42) {
 509                 hpwdt_stop();
 510         } else {
 511                 printk(KERN_CRIT
 512                         "hpwdt: Unexpected close, not stopping watchdog!\n");
 513                 hpwdt_ping();
 514         }
 515
 516         expect_release = 0;
 517
 518         /* /dev/watchdog is being closed, make sure it can be re-opened */
 519         clear_bit(0, &hpwdt_is_open);
 520
 521         return 0;
 522 }
 523
 524 static ssize_t hpwdt_write(struct file *file, const char __user *data,
 525         size_t len, loff_t *ppos)
 526 {
 527         /* See if we got the magic character 'V' and reload the timer */
 528         if (len) {
 529                 if (!nowayout) {
 530                         size_t i;
 531
 532                         /* note: just in case someone wrote the magic character
 533                          * five months ago... */
 534                         expect_release = 0;
 535
 536                         /* scan to see whether or not we got the magic char. */
 537                         for (i = 0; i != len; i++) {
 538                                 char c;
 539                                 if (get_user(c, data + i))
 540                                         return -EFAULT;
 541                                 if (c == 'V')
 542                                         expect_release = 42;
 543                         }
 544                 }
 545
 546                 /* someone wrote to us, we should reload the timer */
 547                 hpwdt_ping();
 548         }
 549
 550         return len;
 551 }
 552
 553 static struct watchdog_info ident = {
 554         .options = WDIOF_SETTIMEOUT |
 555                    WDIOF_KEEPALIVEPING |
 556                    WDIOF_MAGICCLOSE,
 557         .identity = "HP iLO2 HW Watchdog Timer",
 558 };
 559
 560 static long hpwdt_ioctl(struct file *file, unsigned int cmd,
 561         unsigned long arg)
 562 {
 563         void __user *argp = (void __user *)arg;
 564         int __user *p = argp;
 565         int new_margin;
 566         int ret = -ENOTTY;
 567
 568         switch (cmd) {
 569         case WDIOC_GETSUPPORT:
 570                 ret = 0;
 571                 if (copy_to_user(argp, &ident, sizeof(ident)))
 572                         ret = -EFAULT;
 573                 break;
 574
 575         case WDIOC_GETSTATUS:
 576         case WDIOC_GETBOOTSTATUS:
 577                 ret = put_user(0, p);
 578                 break;
 579
 580         case WDIOC_KEEPALIVE:
 581                 hpwdt_ping();
 582                 ret = 0;
 583                 break;
 584
 585         case WDIOC_SETTIMEOUT:
 586                 ret = get_user(new_margin, p);
 587                 if (ret)
 588                         break;
 589
 590                 ret = hpwdt_change_timer(new_margin);
 591                 if (ret)
 592                         break;
 593
 594                 hpwdt_ping();
 595                 /* Fall */
 596         case WDIOC_GETTIMEOUT:
 597                 ret = put_user(soft_margin, p);
 598                 break;
 599         }
 600         return ret;
 601 }
 602
 603 /*
 604  *      Kernel interfaces
 605  */
 606 static const struct file_operations hpwdt_fops = {
 607         .owner = THIS_MODULE,
 608         .llseek = no_llseek,
 609         .write = hpwdt_write,
 610         .unlocked_ioctl = hpwdt_ioctl,
 611         .open = hpwdt_open,
 612         .release = hpwdt_release,
 613 };
 614
 615 static struct miscdevice hpwdt_miscdev = {
 616         .minor = WATCHDOG_MINOR,
 617         .name = "watchdog",
 618         .fops = &hpwdt_fops,
 619 };
 620
 621 static struct notifier_block die_notifier = {
 622         .notifier_call = hpwdt_pretimeout,
 623         .priority = 0x7FFFFFFF,
 624 };
 625
 626 /*
 627  *      Init & Exit
 628  */
 629
 630 static int __devinit hpwdt_init_one(struct pci_dev *dev,
 631                                         const struct pci_device_id *ent)
 632 {
 633         int retval;
 634
 635         /*
 636          * First let's find out if we are on an iLO2 server. We will
 637          * not run on a legacy ASM box.
 638          * So we only support the G5 ProLiant servers and higher.
 639          */
 640         if (dev->subsystem_vendor != PCI_VENDOR_ID_HP) {
 641                 dev_warn(&dev->dev,
 642                         "This server does not have an iLO2 ASIC.\n");
 643                 return -ENODEV;
 644         }
 645
 646         if (pci_enable_device(dev)) {
 647                 dev_warn(&dev->dev,
 648                         "Not possible to enable PCI Device: 0x%x:0x%x.\n",
 649                         ent->vendor, ent->device);
 650                 return -ENODEV;
 651         }
 652
 653         pci_mem_addr = pci_iomap(dev, 1, 0x80);
 654         if (!pci_mem_addr) {
 655                 dev_warn(&dev->dev,
 656                         "Unable to detect the iLO2 server memory.\n");
 657                 retval = -ENOMEM;
 658                 goto error_pci_iomap;
 659         }
 660         hpwdt_timer_reg = pci_mem_addr + 0x70;
 661         hpwdt_timer_con = pci_mem_addr + 0x72;
 662
 663         /* Make sure that we have a valid soft_margin */
 664         if (hpwdt_change_timer(soft_margin))
 665                 hpwdt_change_timer(DEFAULT_MARGIN);
 666
 667         /*
 668          * We need to map the ROM to get the CRU service.
 669          * For 32 bit Operating Systems we need to go through the 32 Bit
 670          * BIOS Service Directory
 671          * For 64 bit Operating Systems we get that service through SMBIOS.
 672          */
 673         retval = detect_cru_service();
 674         if (retval < 0) {
 675                 dev_warn(&dev->dev,
 676                         "Unable to detect the %d Bit CRU Service.\n",
 677                         HPWDT_ARCH);
 678                 goto error_get_cru;
 679         }
 680
 681         /*
 682          * We know this is the only CRU call we need to make so lets keep as
 683          * few instructions as possible once the NMI comes in.
 684          */
 685         cmn_regs.u1.rah = 0x0D;
 686         cmn_regs.u1.ral = 0x02;
 687
 688         retval = register_die_notifier(&die_notifier);
 689         if (retval != 0) {
 690                 dev_warn(&dev->dev,
 691                         "Unable to register a die notifier (err=%d).\n",
 692                         retval);
 693                 goto error_die_notifier;
 694         }
 695
 696         retval = misc_register(&hpwdt_miscdev);
 697         if (retval < 0) {
 698                 dev_warn(&dev->dev,
 699                         "Unable to register miscdev on minor=%d (err=%d).\n",
 700                         WATCHDOG_MINOR, retval);
 701                 goto error_misc_register;
 702         }
 703
 704         printk(KERN_INFO
 705                 "hp Watchdog Timer Driver: %s"
 706                 ", timer margin: %d seconds (nowayout=%d)"
 707                 ", allow kernel dump: %s (default = 0/OFF).\n",
 708                 HPWDT_VERSION, soft_margin, nowayout,
 709                 (allow_kdump == 0) ? "OFF" : "ON");
 710
 711         return 0;
 712
 713 error_misc_register:
 714         unregister_die_notifier(&die_notifier);
 715 error_die_notifier:
 716         if (cru_rom_addr)
 717                 iounmap(cru_rom_addr);
 718 error_get_cru:
 719         pci_iounmap(dev, pci_mem_addr);
 720 error_pci_iomap:
 721         pci_disable_device(dev);
 722         return retval;
 723 }
 724
 725 static void __devexit hpwdt_exit(struct pci_dev *dev)
 726 {
 727         if (!nowayout)
 728                 hpwdt_stop();
 729
 730         misc_deregister(&hpwdt_miscdev);
 731         unregister_die_notifier(&die_notifier);
 732
 733         if (cru_rom_addr)
 734                 iounmap(cru_rom_addr);
 735         pci_iounmap(dev, pci_mem_addr);
 736         pci_disable_device(dev);
 737 }
 738
 739 static struct pci_driver hpwdt_driver = {
 740         .name = "hpwdt",
 741         .id_table = hpwdt_devices,
 742         .probe = hpwdt_init_one,
 743         .remove = __devexit_p(hpwdt_exit),
 744 };
 745
 746 static void __exit hpwdt_cleanup(void)
 747 {
 748         pci_unregister_driver(&hpwdt_driver);
 749 }
 750
 751 static int __init hpwdt_init(void)
 752 {
 753         return pci_register_driver(&hpwdt_driver);
 754 }
 755
 756 MODULE_AUTHOR("Tom Mingarelli");
 757 MODULE_DESCRIPTION("hp watchdog driver");
 758 MODULE_LICENSE("GPL");
 759 MODULE_VERSION(HPWDT_VERSION);
 760 MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
 761
 762 module_param(soft_margin, int, 0);
 763 MODULE_PARM_DESC(soft_margin, "Watchdog timeout in seconds");
 764
 765 module_param(allow_kdump, int, 0);
 766 MODULE_PARM_DESC(allow_kdump, "Start a kernel dump after NMI occurs");
 767
 768 module_param(nowayout, int, 0);
 769 MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default="
 770                 __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
 771
 772 module_init(hpwdt_init);
 773 module_exit(hpwdt_cleanup);