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
  51 struct bios32_service_dir {
  52         u32 signature;
  53         u32 entry_point;
  54         u8 revision;
  55         u8 length;
  56         u8 checksum;
  57         u8 reserved[5];
  58 };
  59
  60 /* type 212 */
  61 struct smbios_cru64_info {
  62         u8 type;
  63         u8 byte_length;
  64         u16 handle;
  65         u32 signature;
  66         u64 physical_address;
  67         u32 double_length;
  68         u32 double_offset;
  69 };
  70 #define SMBIOS_CRU64_INFORMATION        212
  71
  72 struct cmn_registers {
  73         union {
  74                 struct {
  75                         u8 ral;
  76                         u8 rah;
  77                         u16 rea2;
  78                 };
  79                 u32 reax;
  80         } u1;
  81         union {
  82                 struct {
  83                         u8 rbl;
  84                         u8 rbh;
  85                         u8 reb2l;
  86                         u8 reb2h;
  87                 };
  88                 u32 rebx;
  89         } u2;
  90         union {
  91                 struct {
  92                         u8 rcl;
  93                         u8 rch;
  94                         u16 rec2;
  95                 };
  96                 u32 recx;
  97         } u3;
  98         union {
  99                 struct {
 100                         u8 rdl;
 101                         u8 rdh;
 102                         u16 red2;
 103                 };
 104                 u32 redx;
 105         } u4;
 106
 107         u32 resi;
 108         u32 redi;
 109         u16 rds;
 110         u16 res;
 111         u32 reflags;
 112 }  __attribute__((packed));
 113
 114 #define DEFAULT_MARGIN  30
 115 static unsigned int soft_margin = DEFAULT_MARGIN;       /* in seconds */
 116 static unsigned int reload;                     /* the computed soft_margin */
 117 static int nowayout = WATCHDOG_NOWAYOUT;
 118 static char expect_release;
 119 static unsigned long hpwdt_is_open;
 120 static unsigned int allow_kdump;
 121
 122 static void __iomem *pci_mem_addr;              /* the PCI-memory address */
 123 static unsigned long __iomem *hpwdt_timer_reg;
 124 static unsigned long __iomem *hpwdt_timer_con;
 125
 126 static DEFINE_SPINLOCK(rom_lock);
 127
 128 static void *cru_rom_addr;
 129
 130 static struct cmn_registers cmn_regs;
 131
 132 static struct pci_device_id hpwdt_devices[] = {
 133         {
 134          .vendor = PCI_VENDOR_ID_COMPAQ,
 135          .device = 0xB203,
 136          .subvendor = PCI_ANY_ID,
 137          .subdevice = PCI_ANY_ID,
 138         },
 139         {0},                    /* terminate list */
 140 };
 141 MODULE_DEVICE_TABLE(pci, hpwdt_devices);
 142
 143 extern asmlinkage void asminline_call(struct cmn_registers *pi86Regs, unsigned long *pRomEntry);
 144
 145 #ifndef CONFIG_X86_64
 146 /* --32 Bit Bios------------------------------------------------------------ */
 147
 148 #define HPWDT_ARCH      32
 149
 150 asm(".text                          \n\t"
 151     ".align 4                       \n"
 152     "asminline_call:                \n\t"
 153     "pushl       %ebp               \n\t"
 154     "movl        %esp, %ebp         \n\t"
 155     "pusha                          \n\t"
 156     "pushf                          \n\t"
 157     "push        %es                \n\t"
 158     "push        %ds                \n\t"
 159     "pop         %es                \n\t"
 160     "movl        8(%ebp),%eax       \n\t"
 161     "movl        4(%eax),%ebx       \n\t"
 162     "movl        8(%eax),%ecx       \n\t"
 163     "movl        12(%eax),%edx      \n\t"
 164     "movl        16(%eax),%esi      \n\t"
 165     "movl        20(%eax),%edi      \n\t"
 166     "movl        (%eax),%eax        \n\t"
 167     "push        %cs                \n\t"
 168     "call        *12(%ebp)          \n\t"
 169     "pushf                          \n\t"
 170     "pushl       %eax               \n\t"
 171     "movl        8(%ebp),%eax       \n\t"
 172     "movl        %ebx,4(%eax)       \n\t"
 173     "movl        %ecx,8(%eax)       \n\t"
 174     "movl        %edx,12(%eax)      \n\t"
 175     "movl        %esi,16(%eax)      \n\t"
 176     "movl        %edi,20(%eax)      \n\t"
 177     "movw        %ds,24(%eax)       \n\t"
 178     "movw        %es,26(%eax)       \n\t"
 179     "popl        %ebx               \n\t"
 180     "movl        %ebx,(%eax)        \n\t"
 181     "popl        %ebx               \n\t"
 182     "movl        %ebx,28(%eax)      \n\t"
 183     "pop         %es                \n\t"
 184     "popf                           \n\t"
 185     "popa                           \n\t"
 186     "leave                          \n\t"
 187     "ret                            \n\t"
 188     ".previous");
 189
 190
 191 /*
 192  *      cru_detect
 193  *
 194  *      Routine Description:
 195  *      This function uses the 32-bit BIOS Service Directory record to
 196  *      search for a $CRU record.
 197  *
 198  *      Return Value:
 199  *      0        :  SUCCESS
 200  *      <0       :  FAILURE
 201  */
 202 static int __devinit cru_detect(unsigned long map_entry,
 203         unsigned long map_offset)
 204 {
 205         void *bios32_map;
 206         unsigned long *bios32_entrypoint;
 207         unsigned long cru_physical_address;
 208         unsigned long cru_length;
 209         unsigned long physical_bios_base = 0;
 210         unsigned long physical_bios_offset = 0;
 211         int retval = -ENODEV;
 212
 213         bios32_map = ioremap(map_entry, (2 * PAGE_SIZE));
 214
 215         if (bios32_map == NULL)
 216                 return -ENODEV;
 217
 218         bios32_entrypoint = bios32_map + map_offset;
 219
 220         cmn_regs.u1.reax = CRU_BIOS_SIGNATURE_VALUE;
 221
 222         asminline_call(&cmn_regs, bios32_entrypoint);
 223
 224         if (cmn_regs.u1.ral != 0) {
 225                 printk(KERN_WARNING
 226                         "hpwdt: Call succeeded but with an error: 0x%x\n",
 227                         cmn_regs.u1.ral);
 228         } else {
 229                 physical_bios_base = cmn_regs.u2.rebx;
 230                 physical_bios_offset = cmn_regs.u4.redx;
 231                 cru_length = cmn_regs.u3.recx;
 232                 cru_physical_address =
 233                         physical_bios_base + physical_bios_offset;
 234
 235                 /* If the values look OK, then map it in. */
 236                 if ((physical_bios_base + physical_bios_offset)) {
 237                         cru_rom_addr =
 238                                 ioremap(cru_physical_address, cru_length);
 239                         if (cru_rom_addr)
 240                                 retval = 0;
 241                 }
 242
 243                 printk(KERN_DEBUG "hpwdt: CRU Base Address:   0x%lx\n",
 244                         physical_bios_base);
 245                 printk(KERN_DEBUG "hpwdt: CRU Offset Address: 0x%lx\n",
 246                         physical_bios_offset);
 247                 printk(KERN_DEBUG "hpwdt: CRU Length:         0x%lx\n",
 248                         cru_length);
 249                 printk(KERN_DEBUG "hpwdt: CRU Mapped Address: 0x%x\n",
 250                         (unsigned int)&cru_rom_addr);
 251         }
 252         iounmap(bios32_map);
 253         return retval;
 254 }
 255
 256 /*
 257  *      bios_checksum
 258  */
 259 static int __devinit bios_checksum(const char __iomem *ptr, int len)
 260 {
 261         char sum = 0;
 262         int i;
 263
 264         /*
 265          * calculate checksum of size bytes. This should add up
 266          * to zero if we have a valid header.
 267          */
 268         for (i = 0; i < len; i++)
 269                 sum += ptr[i];
 270
 271         return ((sum == 0) && (len > 0));
 272 }
 273
 274 /*
 275  *      bios32_present
 276  *
 277  *      Routine Description:
 278  *      This function finds the 32-bit BIOS Service Directory
 279  *
 280  *      Return Value:
 281  *      0        :  SUCCESS
 282  *      <0       :  FAILURE
 283  */
 284 static int __devinit bios32_present(const char __iomem *p)
 285 {
 286         struct bios32_service_dir *bios_32_ptr;
 287         int length;
 288         unsigned long map_entry, map_offset;
 289
 290         bios_32_ptr = (struct bios32_service_dir *) p;
 291
 292         /*
 293          * Search for signature by checking equal to the swizzled value
 294          * instead of calling another routine to perform a strcmp.
 295          */
 296         if (bios_32_ptr->signature == PCI_BIOS32_SD_VALUE) {
 297                 length = bios_32_ptr->length * PCI_BIOS32_PARAGRAPH_LEN;
 298                 if (bios_checksum(p, length)) {
 299                         /*
 300                          * According to the spec, we're looking for the
 301                          * first 4KB-aligned address below the entrypoint
 302                          * listed in the header. The Service Directory code
 303                          * is guaranteed to occupy no more than 2 4KB pages.
 304                          */
 305                         map_entry = bios_32_ptr->entry_point & ~(PAGE_SIZE - 1);
 306                         map_offset = bios_32_ptr->entry_point - map_entry;
 307
 308                         return cru_detect(map_entry, map_offset);
 309                 }
 310         }
 311         return -ENODEV;
 312 }
 313
 314 static int __devinit detect_cru_service(void)
 315 {
 316         char __iomem *p, *q;
 317         int rc = -1;
 318
 319         /*
 320          * Search from 0x0f0000 through 0x0fffff, inclusive.
 321          */
 322         p = ioremap(PCI_ROM_BASE1, ROM_SIZE);
 323         if (p == NULL)
 324                 return -ENOMEM;
 325
 326         for (q = p; q < p + ROM_SIZE; q += 16) {
 327                 rc = bios32_present(q);
 328                 if (!rc)
 329                         break;
 330         }
 331         iounmap(p);
 332         return rc;
 333 }
 334
 335 #else
 336 /* --64 Bit Bios------------------------------------------------------------ */
 337
 338 #define HPWDT_ARCH      64
 339
 340 asm(".text                      \n\t"
 341     ".align 4                   \n"
 342     "asminline_call:            \n\t"
 343     "pushq      %rbp            \n\t"
 344     "movq       %rsp, %rbp      \n\t"
 345     "pushq      %rax            \n\t"
 346     "pushq      %rbx            \n\t"
 347     "pushq      %rdx            \n\t"
 348     "pushq      %r12            \n\t"
 349     "pushq      %r9             \n\t"
 350     "movq       %rsi, %r12      \n\t"
 351     "movq       %rdi, %r9       \n\t"
 352     "movl       4(%r9),%ebx     \n\t"
 353     "movl       8(%r9),%ecx     \n\t"
 354     "movl       12(%r9),%edx    \n\t"
 355     "movl       16(%r9),%esi    \n\t"
 356     "movl       20(%r9),%edi    \n\t"
 357     "movl       (%r9),%eax      \n\t"
 358     "call       *%r12           \n\t"
 359     "pushfq                     \n\t"
 360     "popq        %r12           \n\t"
 361     "movl       %eax, (%r9)     \n\t"
 362     "movl       %ebx, 4(%r9)    \n\t"
 363     "movl       %ecx, 8(%r9)    \n\t"
 364     "movl       %edx, 12(%r9)   \n\t"
 365     "movl       %esi, 16(%r9)   \n\t"
 366     "movl       %edi, 20(%r9)   \n\t"
 367     "movq       %r12, %rax      \n\t"
 368     "movl       %eax, 28(%r9)   \n\t"
 369     "popq       %r9             \n\t"
 370     "popq       %r12            \n\t"
 371     "popq       %rdx            \n\t"
 372     "popq       %rbx            \n\t"
 373     "popq       %rax            \n\t"
 374     "leave                      \n\t"
 375     "ret                        \n\t"
 376     ".previous");
 377
 378 /*
 379  *      dmi_find_cru
 380  *
 381  *      Routine Description:
 382  *      This function checks whether or not a SMBIOS/DMI record is
 383  *      the 64bit CRU info or not
 384  */
 385 static void __devinit dmi_find_cru(const struct dmi_header *dm)
 386 {
 387         struct smbios_cru64_info *smbios_cru64_ptr;
 388         unsigned long cru_physical_address;
 389
 390         if (dm->type == SMBIOS_CRU64_INFORMATION) {
 391                 smbios_cru64_ptr = (struct smbios_cru64_info *) dm;
 392                 if (smbios_cru64_ptr->signature == CRU_BIOS_SIGNATURE_VALUE) {
 393                         cru_physical_address =
 394                                 smbios_cru64_ptr->physical_address +
 395                                 smbios_cru64_ptr->double_offset;
 396                         cru_rom_addr = ioremap(cru_physical_address,
 397                                 smbios_cru64_ptr->double_length);
 398                         set_memory_x((unsigned long)cru_rom_addr & PAGE_MASK,
 399                                 smbios_cru64_ptr->double_length >> PAGE_SHIFT);
 400                 }
 401         }
 402 }
 403
 404 static int __devinit detect_cru_service(void)
 405 {
 406         cru_rom_addr = NULL;
 407
 408         dmi_walk(dmi_find_cru);
 409
 410         /* if cru_rom_addr has been set then we found a CRU service */
 411         return ((cru_rom_addr != NULL) ? 0 : -ENODEV);
 412 }
 413
 414 /* ------------------------------------------------------------------------- */
 415
 416 #endif
 417
 418 /*
 419  *      Watchdog operations
 420  */
 421 static void hpwdt_start(void)
 422 {
 423         reload = (soft_margin * 1000) / 128;
 424         iowrite16(reload, hpwdt_timer_reg);
 425         iowrite16(0x85, hpwdt_timer_con);
 426 }
 427
 428 static void hpwdt_stop(void)
 429 {
 430         unsigned long data;
 431
 432         data = ioread16(hpwdt_timer_con);
 433         data &= 0xFE;
 434         iowrite16(data, hpwdt_timer_con);
 435 }
 436
 437 static void hpwdt_ping(void)
 438 {
 439         iowrite16(reload, hpwdt_timer_reg);
 440 }
 441
 442 static int hpwdt_change_timer(int new_margin)
 443 {
 444         /* Arbitrary, can't find the card's limits */
 445         if (new_margin < 30 || new_margin > 600) {
 446                 printk(KERN_WARNING
 447                         "hpwdt: New value passed in is invalid: %d seconds.\n",
 448                         new_margin);
 449                 return -EINVAL;
 450         }
 451
 452         soft_margin = new_margin;
 453         printk(KERN_DEBUG
 454                 "hpwdt: New timer passed in is %d seconds.\n",
 455                 new_margin);
 456         reload = (soft_margin * 1000) / 128;
 457
 458         return 0;
 459 }
 460
 461 /*
 462  *      NMI Handler
 463  */
 464 static int hpwdt_pretimeout(struct notifier_block *nb, unsigned long ulReason,
 465                                 void *data)
 466 {
 467         unsigned long rom_pl;
 468         static int die_nmi_called;
 469
 470         if (ulReason != DIE_NMI && ulReason != DIE_NMI_IPI)
 471                 return NOTIFY_OK;
 472
 473         spin_lock_irqsave(&rom_lock, rom_pl);
 474         if (!die_nmi_called)
 475                 asminline_call(&cmn_regs, cru_rom_addr);
 476         die_nmi_called = 1;
 477         spin_unlock_irqrestore(&rom_lock, rom_pl);
 478         if (cmn_regs.u1.ral == 0) {
 479                 printk(KERN_WARNING "hpwdt: An NMI occurred, "
 480                         "but unable to determine source.\n");
 481         } else {
 482                 if (allow_kdump)
 483                         hpwdt_stop();
 484                 panic("An NMI occurred, please see the Integrated "
 485                         "Management Log for details.\n");
 486         }
 487
 488         return NOTIFY_OK;
 489 }
 490
 491 /*
 492  *      /dev/watchdog handling
 493  */
 494 static int hpwdt_open(struct inode *inode, struct file *file)
 495 {
 496         /* /dev/watchdog can only be opened once */
 497         if (test_and_set_bit(0, &hpwdt_is_open))
 498                 return -EBUSY;
 499
 500         /* Start the watchdog */
 501         hpwdt_start();
 502         hpwdt_ping();
 503
 504         return nonseekable_open(inode, file);
 505 }
 506
 507 static int hpwdt_release(struct inode *inode, struct file *file)
 508 {
 509         /* Stop the watchdog */
 510         if (expect_release == 42) {
 511                 hpwdt_stop();
 512         } else {
 513                 printk(KERN_CRIT
 514                         "hpwdt: Unexpected close, not stopping watchdog!\n");
 515                 hpwdt_ping();
 516         }
 517
 518         expect_release = 0;
 519
 520         /* /dev/watchdog is being closed, make sure it can be re-opened */
 521         clear_bit(0, &hpwdt_is_open);
 522
 523         return 0;
 524 }
 525
 526 static ssize_t hpwdt_write(struct file *file, const char __user *data,
 527         size_t len, loff_t *ppos)
 528 {
 529         /* See if we got the magic character 'V' and reload the timer */
 530         if (len) {
 531                 if (!nowayout) {
 532                         size_t i;
 533
 534                         /* note: just in case someone wrote the magic character
 535                          * five months ago... */
 536                         expect_release = 0;
 537
 538                         /* scan to see whether or not we got the magic char. */
 539                         for (i = 0; i != len; i++) {
 540                                 char c;
 541                                 if (get_user(c, data + i))
 542                                         return -EFAULT;
 543                                 if (c == 'V')
 544                                         expect_release = 42;
 545                         }
 546                 }
 547
 548                 /* someone wrote to us, we should reload the timer */
 549                 hpwdt_ping();
 550         }
 551
 552         return len;
 553 }
 554
 555 static struct watchdog_info ident = {
 556         .options = WDIOF_SETTIMEOUT |
 557                    WDIOF_KEEPALIVEPING |
 558                    WDIOF_MAGICCLOSE,
 559         .identity = "HP iLO2 HW Watchdog Timer",
 560 };
 561
 562 static long hpwdt_ioctl(struct file *file, unsigned int cmd,
 563         unsigned long arg)
 564 {
 565         void __user *argp = (void __user *)arg;
 566         int __user *p = argp;
 567         int new_margin;
 568         int ret = -ENOTTY;
 569
 570         switch (cmd) {
 571         case WDIOC_GETSUPPORT:
 572                 ret = 0;
 573                 if (copy_to_user(argp, &ident, sizeof(ident)))
 574                         ret = -EFAULT;
 575                 break;
 576
 577         case WDIOC_GETSTATUS:
 578         case WDIOC_GETBOOTSTATUS:
 579                 ret = put_user(0, p);
 580                 break;
 581
 582         case WDIOC_KEEPALIVE:
 583                 hpwdt_ping();
 584                 ret = 0;
 585                 break;
 586
 587         case WDIOC_SETTIMEOUT:
 588                 ret = get_user(new_margin, p);
 589                 if (ret)
 590                         break;
 591
 592                 ret = hpwdt_change_timer(new_margin);
 593                 if (ret)
 594                         break;
 595
 596                 hpwdt_ping();
 597                 /* Fall */
 598         case WDIOC_GETTIMEOUT:
 599                 ret = put_user(soft_margin, p);
 600                 break;
 601         }
 602         return ret;
 603 }
 604
 605 /*
 606  *      Kernel interfaces
 607  */
 608 static struct file_operations hpwdt_fops = {
 609         .owner = THIS_MODULE,
 610         .llseek = no_llseek,
 611         .write = hpwdt_write,
 612         .unlocked_ioctl = hpwdt_ioctl,
 613         .open = hpwdt_open,
 614         .release = hpwdt_release,
 615 };
 616
 617 static struct miscdevice hpwdt_miscdev = {
 618         .minor = WATCHDOG_MINOR,
 619         .name = "watchdog",
 620         .fops = &hpwdt_fops,
 621 };
 622
 623 static struct notifier_block die_notifier = {
 624         .notifier_call = hpwdt_pretimeout,
 625         .priority = 0x7FFFFFFF,
 626 };
 627
 628 /*
 629  *      Init & Exit
 630  */
 631
 632 static int __devinit hpwdt_init_one(struct pci_dev *dev,
 633                                         const struct pci_device_id *ent)
 634 {
 635         int retval;
 636
 637         /*
 638          * First let's find out if we are on an iLO2 server. We will
 639          * not run on a legacy ASM box.
 640          * So we only support the G5 ProLiant servers and higher.
 641          */
 642         if (dev->subsystem_vendor != PCI_VENDOR_ID_HP) {
 643                 dev_warn(&dev->dev,
 644                         "This server does not have an iLO2 ASIC.\n");
 645                 return -ENODEV;
 646         }
 647
 648         if (pci_enable_device(dev)) {
 649                 dev_warn(&dev->dev,
 650                         "Not possible to enable PCI Device: 0x%x:0x%x.\n",
 651                         ent->vendor, ent->device);
 652                 return -ENODEV;
 653         }
 654
 655         pci_mem_addr = pci_iomap(dev, 1, 0x80);
 656         if (!pci_mem_addr) {
 657                 dev_warn(&dev->dev,
 658                         "Unable to detect the iLO2 server memory.\n");
 659                 retval = -ENOMEM;
 660                 goto error_pci_iomap;
 661         }
 662         hpwdt_timer_reg = pci_mem_addr + 0x70;
 663         hpwdt_timer_con = pci_mem_addr + 0x72;
 664
 665         /* Make sure that we have a valid soft_margin */
 666         if (hpwdt_change_timer(soft_margin))
 667                 hpwdt_change_timer(DEFAULT_MARGIN);
 668
 669         /*
 670          * We need to map the ROM to get the CRU service.
 671          * For 32 bit Operating Systems we need to go through the 32 Bit
 672          * BIOS Service Directory
 673          * For 64 bit Operating Systems we get that service through SMBIOS.
 674          */
 675         retval = detect_cru_service();
 676         if (retval < 0) {
 677                 dev_warn(&dev->dev,
 678                         "Unable to detect the %d Bit CRU Service.\n",
 679                         HPWDT_ARCH);
 680                 goto error_get_cru;
 681         }
 682
 683         /*
 684          * We know this is the only CRU call we need to make so lets keep as
 685          * few instructions as possible once the NMI comes in.
 686          */
 687         cmn_regs.u1.rah = 0x0D;
 688         cmn_regs.u1.ral = 0x02;
 689
 690         retval = register_die_notifier(&die_notifier);
 691         if (retval != 0) {
 692                 dev_warn(&dev->dev,
 693                         "Unable to register a die notifier (err=%d).\n",
 694                         retval);
 695                 goto error_die_notifier;
 696         }
 697
 698         retval = misc_register(&hpwdt_miscdev);
 699         if (retval < 0) {
 700                 dev_warn(&dev->dev,
 701                         "Unable to register miscdev on minor=%d (err=%d).\n",
 702                         WATCHDOG_MINOR, retval);
 703                 goto error_misc_register;
 704         }
 705
 706         printk(KERN_INFO
 707                 "hp Watchdog Timer Driver: 1.00"
 708                 ", timer margin: %d seconds (nowayout=%d)"
 709                 ", allow kernel dump: %s (default = 0/OFF).\n",
 710                 soft_margin, nowayout, (allow_kdump == 0) ? "OFF" : "ON");
 711
 712         return 0;
 713
 714 error_misc_register:
 715         unregister_die_notifier(&die_notifier);
 716 error_die_notifier:
 717         if (cru_rom_addr)
 718                 iounmap(cru_rom_addr);
 719 error_get_cru:
 720         pci_iounmap(dev, pci_mem_addr);
 721 error_pci_iomap:
 722         pci_disable_device(dev);
 723         return retval;
 724 }
 725
 726 static void __devexit hpwdt_exit(struct pci_dev *dev)
 727 {
 728         if (!nowayout)
 729                 hpwdt_stop();
 730
 731         misc_deregister(&hpwdt_miscdev);
 732         unregister_die_notifier(&die_notifier);
 733
 734         if (cru_rom_addr)
 735                 iounmap(cru_rom_addr);
 736         pci_iounmap(dev, pci_mem_addr);
 737         pci_disable_device(dev);
 738 }
 739
 740 static struct pci_driver hpwdt_driver = {
 741         .name = "hpwdt",
 742         .id_table = hpwdt_devices,
 743         .probe = hpwdt_init_one,
 744         .remove = __devexit_p(hpwdt_exit),
 745 };
 746
 747 static void __exit hpwdt_cleanup(void)
 748 {
 749         pci_unregister_driver(&hpwdt_driver);
 750 }
 751
 752 static int __init hpwdt_init(void)
 753 {
 754         return pci_register_driver(&hpwdt_driver);
 755 }
 756
 757 MODULE_AUTHOR("Tom Mingarelli");
 758 MODULE_DESCRIPTION("hp watchdog driver");
 759 MODULE_LICENSE("GPL");
 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);