linux/drivers/watchdog/hpwdt.c
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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
  51struct 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 */
  61struct 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
  72struct 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
 115static unsigned int soft_margin = DEFAULT_MARGIN;       /* in seconds */
 116static unsigned int reload;                     /* the computed soft_margin */
 117static int nowayout = WATCHDOG_NOWAYOUT;
 118static char expect_release;
 119static unsigned long hpwdt_is_open;
 120static unsigned int allow_kdump;
 121
 122static void __iomem *pci_mem_addr;              /* the PCI-memory address */
 123static unsigned long __iomem *hpwdt_timer_reg;
 124static unsigned long __iomem *hpwdt_timer_con;
 125
 126static DEFINE_SPINLOCK(rom_lock);
 127
 128static void *cru_rom_addr;
 129
 130static struct cmn_registers cmn_regs;
 131
 132static 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};
 141MODULE_DEVICE_TABLE(pci, hpwdt_devices);
 142
 143extern 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
 150asm(".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 */
 202static 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 */
 259static 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 */
 284static 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
 314static 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
 340asm(".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 */
 385static 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
 404static 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 */
 421static 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
 428static 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
 437static void hpwdt_ping(void)
 438{
 439        iowrite16(reload, hpwdt_timer_reg);
 440}
 441
 442static 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 */
 464static 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 */
 494static 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
 507static 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
 526static 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
 555static struct watchdog_info ident = {
 556        .options = WDIOF_SETTIMEOUT |
 557                   WDIOF_KEEPALIVEPING |
 558                   WDIOF_MAGICCLOSE,
 559        .identity = "HP iLO2 HW Watchdog Timer",
 560};
 561
 562static 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 */
 608static 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
 617static struct miscdevice hpwdt_miscdev = {
 618        .minor = WATCHDOG_MINOR,
 619        .name = "watchdog",
 620        .fops = &hpwdt_fops,
 621};
 622
 623static struct notifier_block die_notifier = {
 624        .notifier_call = hpwdt_pretimeout,
 625        .priority = 0x7FFFFFFF,
 626};
 627
 628/*
 629 *      Init & Exit
 630 */
 631
 632static 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
 714error_misc_register:
 715        unregister_die_notifier(&die_notifier);
 716error_die_notifier:
 717        if (cru_rom_addr)
 718                iounmap(cru_rom_addr);
 719error_get_cru:
 720        pci_iounmap(dev, pci_mem_addr);
 721error_pci_iomap:
 722        pci_disable_device(dev);
 723        return retval;
 724}
 725
 726static 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
 740static 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
 747static void __exit hpwdt_cleanup(void)
 748{
 749        pci_unregister_driver(&hpwdt_driver);
 750}
 751
 752static int __init hpwdt_init(void)
 753{
 754        return pci_register_driver(&hpwdt_driver);
 755}
 756
 757MODULE_AUTHOR("Tom Mingarelli");
 758MODULE_DESCRIPTION("hp watchdog driver");
 759MODULE_LICENSE("GPL");
 760MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
 761
 762module_param(soft_margin, int, 0);
 763MODULE_PARM_DESC(soft_margin, "Watchdog timeout in seconds");
 764
 765module_param(allow_kdump, int, 0);
 766MODULE_PARM_DESC(allow_kdump, "Start a kernel dump after NMI occurs");
 767
 768module_param(nowayout, int, 0);
 769MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default="
 770                __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
 771
 772module_init(hpwdt_init);
 773module_exit(hpwdt_cleanup);
 774