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/io.h> 20 #include <linux/bitops.h> 21 #include <linux/kernel.h> 22 #include <linux/miscdevice.h> 23 #include <linux/module.h> 24 #include <linux/moduleparam.h> 25 #include <linux/pci.h> 26 #include <linux/pci_ids.h> 27 #include <linux/types.h> 28 #include <linux/uaccess.h> 29 #include <linux/watchdog.h> 30 #ifdef CONFIG_HPWDT_NMI_DECODING 31 #include <linux/dmi.h> 32 #include <linux/spinlock.h> 33 #include <linux/nmi.h> 34 #include <linux/kdebug.h> 35 #include <linux/notifier.h> 36 #include <asm/cacheflush.h> 37 #endif /* CONFIG_HPWDT_NMI_DECODING */ 38 39 #define HPWDT_VERSION "1.2.0" 40 #define SECS_TO_TICKS(secs) ((secs) * 1000 / 128) 41 #define TICKS_TO_SECS(ticks) ((ticks) * 128 / 1000) 42 #define HPWDT_MAX_TIMER TICKS_TO_SECS(65535) 43 #define DEFAULT_MARGIN 30 44 45 static unsigned int soft_margin = DEFAULT_MARGIN; /* in seconds */ 46 static unsigned int reload; /* the computed soft_margin */ 47 static int nowayout = WATCHDOG_NOWAYOUT; 48 static char expect_release; 49 static unsigned long hpwdt_is_open; 50 51 static void __iomem *pci_mem_addr; /* the PCI-memory address */ 52 static unsigned long __iomem *hpwdt_timer_reg; 53 static unsigned long __iomem *hpwdt_timer_con; 54 55 static struct pci_device_id hpwdt_devices[] = { 56 { PCI_DEVICE(PCI_VENDOR_ID_COMPAQ, 0xB203) }, /* iLO2 */ 57 { PCI_DEVICE(PCI_VENDOR_ID_HP, 0x3306) }, /* iLO3 */ 58 {0}, /* terminate list */ 59 }; 60 MODULE_DEVICE_TABLE(pci, hpwdt_devices); 61 62 #ifdef CONFIG_HPWDT_NMI_DECODING 63 #define PCI_BIOS32_SD_VALUE 0x5F32335F /* "_32_" */ 64 #define CRU_BIOS_SIGNATURE_VALUE 0x55524324 65 #define PCI_BIOS32_PARAGRAPH_LEN 16 66 #define PCI_ROM_BASE1 0x000F0000 67 #define ROM_SIZE 0x10000 68 69 struct bios32_service_dir { 70 u32 signature; 71 u32 entry_point; 72 u8 revision; 73 u8 length; 74 u8 checksum; 75 u8 reserved[5]; 76 }; 77 78 /* type 212 */ 79 struct smbios_cru64_info { 80 u8 type; 81 u8 byte_length; 82 u16 handle; 83 u32 signature; 84 u64 physical_address; 85 u32 double_length; 86 u32 double_offset; 87 }; 88 #define SMBIOS_CRU64_INFORMATION 212 89 90 struct cmn_registers { 91 union { 92 struct { 93 u8 ral; 94 u8 rah; 95 u16 rea2; 96 }; 97 u32 reax; 98 } u1; 99 union { 100 struct { 101 u8 rbl; 102 u8 rbh; 103 u8 reb2l; 104 u8 reb2h; 105 }; 106 u32 rebx; 107 } u2; 108 union { 109 struct { 110 u8 rcl; 111 u8 rch; 112 u16 rec2; 113 }; 114 u32 recx; 115 } u3; 116 union { 117 struct { 118 u8 rdl; 119 u8 rdh; 120 u16 red2; 121 }; 122 u32 redx; 123 } u4; 124 125 u32 resi; 126 u32 redi; 127 u16 rds; 128 u16 res; 129 u32 reflags; 130 } __attribute__((packed)); 131 132 static unsigned int hpwdt_nmi_decoding; 133 static unsigned int allow_kdump; 134 static unsigned int priority; /* hpwdt at end of die_notify list */ 135 static DEFINE_SPINLOCK(rom_lock); 136 static void *cru_rom_addr; 137 static struct cmn_registers cmn_regs; 138 139 extern asmlinkage void asminline_call(struct cmn_registers *pi86Regs, 140 unsigned long *pRomEntry); 141 142 #ifdef CONFIG_X86_32 143 /* --32 Bit Bios------------------------------------------------------------ */ 144 145 #define HPWDT_ARCH 32 146 147 asm(".text \n\t" 148 ".align 4 \n" 149 "asminline_call: \n\t" 150 "pushl %ebp \n\t" 151 "movl %esp, %ebp \n\t" 152 "pusha \n\t" 153 "pushf \n\t" 154 "push %es \n\t" 155 "push %ds \n\t" 156 "pop %es \n\t" 157 "movl 8(%ebp),%eax \n\t" 158 "movl 4(%eax),%ebx \n\t" 159 "movl 8(%eax),%ecx \n\t" 160 "movl 12(%eax),%edx \n\t" 161 "movl 16(%eax),%esi \n\t" 162 "movl 20(%eax),%edi \n\t" 163 "movl (%eax),%eax \n\t" 164 "push %cs \n\t" 165 "call *12(%ebp) \n\t" 166 "pushf \n\t" 167 "pushl %eax \n\t" 168 "movl 8(%ebp),%eax \n\t" 169 "movl %ebx,4(%eax) \n\t" 170 "movl %ecx,8(%eax) \n\t" 171 "movl %edx,12(%eax) \n\t" 172 "movl %esi,16(%eax) \n\t" 173 "movl %edi,20(%eax) \n\t" 174 "movw %ds,24(%eax) \n\t" 175 "movw %es,26(%eax) \n\t" 176 "popl %ebx \n\t" 177 "movl %ebx,(%eax) \n\t" 178 "popl %ebx \n\t" 179 "movl %ebx,28(%eax) \n\t" 180 "pop %es \n\t" 181 "popf \n\t" 182 "popa \n\t" 183 "leave \n\t" 184 "ret \n\t" 185 ".previous"); 186 187 188 /* 189 * cru_detect 190 * 191 * Routine Description: 192 * This function uses the 32-bit BIOS Service Directory record to 193 * search for a $CRU record. 194 * 195 * Return Value: 196 * 0 : SUCCESS 197 * <0 : FAILURE 198 */ 199 static int __devinit cru_detect(unsigned long map_entry, 200 unsigned long map_offset) 201 { 202 void *bios32_map; 203 unsigned long *bios32_entrypoint; 204 unsigned long cru_physical_address; 205 unsigned long cru_length; 206 unsigned long physical_bios_base = 0; 207 unsigned long physical_bios_offset = 0; 208 int retval = -ENODEV; 209 210 bios32_map = ioremap(map_entry, (2 * PAGE_SIZE)); 211 212 if (bios32_map == NULL) 213 return -ENODEV; 214 215 bios32_entrypoint = bios32_map + map_offset; 216 217 cmn_regs.u1.reax = CRU_BIOS_SIGNATURE_VALUE; 218 219 asminline_call(&cmn_regs, bios32_entrypoint); 220 221 if (cmn_regs.u1.ral != 0) { 222 printk(KERN_WARNING 223 "hpwdt: Call succeeded but with an error: 0x%x\n", 224 cmn_regs.u1.ral); 225 } else { 226 physical_bios_base = cmn_regs.u2.rebx; 227 physical_bios_offset = cmn_regs.u4.redx; 228 cru_length = cmn_regs.u3.recx; 229 cru_physical_address = 230 physical_bios_base + physical_bios_offset; 231 232 /* If the values look OK, then map it in. */ 233 if ((physical_bios_base + physical_bios_offset)) { 234 cru_rom_addr = 235 ioremap(cru_physical_address, cru_length); 236 if (cru_rom_addr) 237 retval = 0; 238 } 239 240 printk(KERN_DEBUG "hpwdt: CRU Base Address: 0x%lx\n", 241 physical_bios_base); 242 printk(KERN_DEBUG "hpwdt: CRU Offset Address: 0x%lx\n", 243 physical_bios_offset); 244 printk(KERN_DEBUG "hpwdt: CRU Length: 0x%lx\n", 245 cru_length); 246 printk(KERN_DEBUG "hpwdt: CRU Mapped Address: %p\n", 247 &cru_rom_addr); 248 } 249 iounmap(bios32_map); 250 return retval; 251 } 252 253 /* 254 * bios_checksum 255 */ 256 static int __devinit bios_checksum(const char __iomem *ptr, int len) 257 { 258 char sum = 0; 259 int i; 260 261 /* 262 * calculate checksum of size bytes. This should add up 263 * to zero if we have a valid header. 264 */ 265 for (i = 0; i < len; i++) 266 sum += ptr[i]; 267 268 return ((sum == 0) && (len > 0)); 269 } 270 271 /* 272 * bios32_present 273 * 274 * Routine Description: 275 * This function finds the 32-bit BIOS Service Directory 276 * 277 * Return Value: 278 * 0 : SUCCESS 279 * <0 : FAILURE 280 */ 281 static int __devinit bios32_present(const char __iomem *p) 282 { 283 struct bios32_service_dir *bios_32_ptr; 284 int length; 285 unsigned long map_entry, map_offset; 286 287 bios_32_ptr = (struct bios32_service_dir *) p; 288 289 /* 290 * Search for signature by checking equal to the swizzled value 291 * instead of calling another routine to perform a strcmp. 292 */ 293 if (bios_32_ptr->signature == PCI_BIOS32_SD_VALUE) { 294 length = bios_32_ptr->length * PCI_BIOS32_PARAGRAPH_LEN; 295 if (bios_checksum(p, length)) { 296 /* 297 * According to the spec, we're looking for the 298 * first 4KB-aligned address below the entrypoint 299 * listed in the header. The Service Directory code 300 * is guaranteed to occupy no more than 2 4KB pages. 301 */ 302 map_entry = bios_32_ptr->entry_point & ~(PAGE_SIZE - 1); 303 map_offset = bios_32_ptr->entry_point - map_entry; 304 305 return cru_detect(map_entry, map_offset); 306 } 307 } 308 return -ENODEV; 309 } 310 311 static int __devinit detect_cru_service(void) 312 { 313 char __iomem *p, *q; 314 int rc = -1; 315 316 /* 317 * Search from 0x0f0000 through 0x0fffff, inclusive. 318 */ 319 p = ioremap(PCI_ROM_BASE1, ROM_SIZE); 320 if (p == NULL) 321 return -ENOMEM; 322 323 for (q = p; q < p + ROM_SIZE; q += 16) { 324 rc = bios32_present(q); 325 if (!rc) 326 break; 327 } 328 iounmap(p); 329 return rc; 330 } 331 /* ------------------------------------------------------------------------- */ 332 #endif /* CONFIG_X86_32 */ 333 #ifdef CONFIG_X86_64 334 /* --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, void *dummy) 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, NULL); 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 #endif /* CONFIG_X86_64 */ 413 #endif /* CONFIG_HPWDT_NMI_DECODING */ 414 415 /* 416 * Watchdog operations 417 */ 418 static void hpwdt_start(void) 419 { 420 reload = SECS_TO_TICKS(soft_margin); 421 iowrite16(reload, hpwdt_timer_reg); 422 iowrite16(0x85, hpwdt_timer_con); 423 } 424 425 static void hpwdt_stop(void) 426 { 427 unsigned long data; 428 429 data = ioread16(hpwdt_timer_con); 430 data &= 0xFE; 431 iowrite16(data, hpwdt_timer_con); 432 } 433 434 static void hpwdt_ping(void) 435 { 436 iowrite16(reload, hpwdt_timer_reg); 437 } 438 439 static int hpwdt_change_timer(int new_margin) 440 { 441 if (new_margin < 1 || new_margin > HPWDT_MAX_TIMER) { 442 printk(KERN_WARNING 443 "hpwdt: New value passed in is invalid: %d seconds.\n", 444 new_margin); 445 return -EINVAL; 446 } 447 448 soft_margin = new_margin; 449 printk(KERN_DEBUG 450 "hpwdt: New timer passed in is %d seconds.\n", 451 new_margin); 452 reload = SECS_TO_TICKS(soft_margin); 453 454 return 0; 455 } 456 457 static int hpwdt_time_left(void) 458 { 459 return TICKS_TO_SECS(ioread16(hpwdt_timer_reg)); 460 } 461 462 #ifdef CONFIG_HPWDT_NMI_DECODING 463 /* 464 * NMI Handler 465 */ 466 static int hpwdt_pretimeout(struct notifier_block *nb, unsigned long ulReason, 467 void *data) 468 { 469 unsigned long rom_pl; 470 static int die_nmi_called; 471 472 if (ulReason != DIE_NMIUNKNOWN) 473 goto out; 474 475 if (!hpwdt_nmi_decoding) 476 goto out; 477 478 spin_lock_irqsave(&rom_lock, rom_pl); 479 if (!die_nmi_called) 480 asminline_call(&cmn_regs, cru_rom_addr); 481 die_nmi_called = 1; 482 spin_unlock_irqrestore(&rom_lock, rom_pl); 483 if (cmn_regs.u1.ral == 0) { 484 printk(KERN_WARNING "hpwdt: An NMI occurred, " 485 "but unable to determine source.\n"); 486 } else { 487 if (allow_kdump) 488 hpwdt_stop(); 489 panic("An NMI occurred, please see the Integrated " 490 "Management Log for details.\n"); 491 } 492 out: 493 return NOTIFY_OK; 494 } 495 #endif /* CONFIG_HPWDT_NMI_DECODING */ 496 497 /* 498 * /dev/watchdog handling 499 */ 500 static int hpwdt_open(struct inode *inode, struct file *file) 501 { 502 /* /dev/watchdog can only be opened once */ 503 if (test_and_set_bit(0, &hpwdt_is_open)) 504 return -EBUSY; 505 506 /* Start the watchdog */ 507 hpwdt_start(); 508 hpwdt_ping(); 509 510 return nonseekable_open(inode, file); 511 } 512 513 static int hpwdt_release(struct inode *inode, struct file *file) 514 { 515 /* Stop the watchdog */ 516 if (expect_release == 42) { 517 hpwdt_stop(); 518 } else { 519 printk(KERN_CRIT 520 "hpwdt: Unexpected close, not stopping watchdog!\n"); 521 hpwdt_ping(); 522 } 523 524 expect_release = 0; 525 526 /* /dev/watchdog is being closed, make sure it can be re-opened */ 527 clear_bit(0, &hpwdt_is_open); 528 529 return 0; 530 } 531 532 static ssize_t hpwdt_write(struct file *file, const char __user *data, 533 size_t len, loff_t *ppos) 534 { 535 /* See if we got the magic character 'V' and reload the timer */ 536 if (len) { 537 if (!nowayout) { 538 size_t i; 539 540 /* note: just in case someone wrote the magic character 541 * five months ago... */ 542 expect_release = 0; 543 544 /* scan to see whether or not we got the magic char. */ 545 for (i = 0; i != len; i++) { 546 char c; 547 if (get_user(c, data + i)) 548 return -EFAULT; 549 if (c == 'V') 550 expect_release = 42; 551 } 552 } 553 554 /* someone wrote to us, we should reload the timer */ 555 hpwdt_ping(); 556 } 557 558 return len; 559 } 560 561 static const struct watchdog_info ident = { 562 .options = WDIOF_SETTIMEOUT | 563 WDIOF_KEEPALIVEPING | 564 WDIOF_MAGICCLOSE, 565 .identity = "HP iLO2+ HW Watchdog Timer", 566 }; 567 568 static long hpwdt_ioctl(struct file *file, unsigned int cmd, 569 unsigned long arg) 570 { 571 void __user *argp = (void __user *)arg; 572 int __user *p = argp; 573 int new_margin; 574 int ret = -ENOTTY; 575 576 switch (cmd) { 577 case WDIOC_GETSUPPORT: 578 ret = 0; 579 if (copy_to_user(argp, &ident, sizeof(ident))) 580 ret = -EFAULT; 581 break; 582 583 case WDIOC_GETSTATUS: 584 case WDIOC_GETBOOTSTATUS: 585 ret = put_user(0, p); 586 break; 587 588 case WDIOC_KEEPALIVE: 589 hpwdt_ping(); 590 ret = 0; 591 break; 592 593 case WDIOC_SETTIMEOUT: 594 ret = get_user(new_margin, p); 595 if (ret) 596 break; 597 598 ret = hpwdt_change_timer(new_margin); 599 if (ret) 600 break; 601 602 hpwdt_ping(); 603 /* Fall */ 604 case WDIOC_GETTIMEOUT: 605 ret = put_user(soft_margin, p); 606 break; 607 608 case WDIOC_GETTIMELEFT: 609 ret = put_user(hpwdt_time_left(), p); 610 break; 611 } 612 return ret; 613 } 614 615 /* 616 * Kernel interfaces 617 */ 618 static const struct file_operations hpwdt_fops = { 619 .owner = THIS_MODULE, 620 .llseek = no_llseek, 621 .write = hpwdt_write, 622 .unlocked_ioctl = hpwdt_ioctl, 623 .open = hpwdt_open, 624 .release = hpwdt_release, 625 }; 626 627 static struct miscdevice hpwdt_miscdev = { 628 .minor = WATCHDOG_MINOR, 629 .name = "watchdog", 630 .fops = &hpwdt_fops, 631 }; 632 633 #ifdef CONFIG_HPWDT_NMI_DECODING 634 static struct notifier_block die_notifier = { 635 .notifier_call = hpwdt_pretimeout, 636 .priority = 0, 637 }; 638 #endif /* CONFIG_HPWDT_NMI_DECODING */ 639 640 /* 641 * Init & Exit 642 */ 643 644 #ifdef CONFIG_HPWDT_NMI_DECODING 645 #ifdef CONFIG_X86_LOCAL_APIC 646 static void __devinit hpwdt_check_nmi_decoding(struct pci_dev *dev) 647 { 648 /* 649 * If nmi_watchdog is turned off then we can turn on 650 * our nmi decoding capability. 651 */ 652 hpwdt_nmi_decoding = 1; 653 } 654 #else 655 static void __devinit hpwdt_check_nmi_decoding(struct pci_dev *dev) 656 { 657 dev_warn(&dev->dev, "NMI decoding is disabled. " 658 "Your kernel does not support a NMI Watchdog.\n"); 659 } 660 #endif /* CONFIG_X86_LOCAL_APIC */ 661 662 static int __devinit hpwdt_init_nmi_decoding(struct pci_dev *dev) 663 { 664 int retval; 665 666 /* 667 * We need to map the ROM to get the CRU service. 668 * For 32 bit Operating Systems we need to go through the 32 Bit 669 * BIOS Service Directory 670 * For 64 bit Operating Systems we get that service through SMBIOS. 671 */ 672 retval = detect_cru_service(); 673 if (retval < 0) { 674 dev_warn(&dev->dev, 675 "Unable to detect the %d Bit CRU Service.\n", 676 HPWDT_ARCH); 677 return retval; 678 } 679 680 /* 681 * We know this is the only CRU call we need to make so lets keep as 682 * few instructions as possible once the NMI comes in. 683 */ 684 cmn_regs.u1.rah = 0x0D; 685 cmn_regs.u1.ral = 0x02; 686 687 /* 688 * If the priority is set to 1, then we will be put first on the 689 * die notify list to handle a critical NMI. The default is to 690 * be last so other users of the NMI signal can function. 691 */ 692 if (priority) 693 die_notifier.priority = 0x7FFFFFFF; 694 695 retval = register_die_notifier(&die_notifier); 696 if (retval != 0) { 697 dev_warn(&dev->dev, 698 "Unable to register a die notifier (err=%d).\n", 699 retval); 700 if (cru_rom_addr) 701 iounmap(cru_rom_addr); 702 } 703 704 dev_info(&dev->dev, 705 "HP Watchdog Timer Driver: NMI decoding initialized" 706 ", allow kernel dump: %s (default = 0/OFF)" 707 ", priority: %s (default = 0/LAST).\n", 708 (allow_kdump == 0) ? "OFF" : "ON", 709 (priority == 0) ? "LAST" : "FIRST"); 710 return 0; 711 } 712 713 static void __devexit hpwdt_exit_nmi_decoding(void) 714 { 715 unregister_die_notifier(&die_notifier); 716 if (cru_rom_addr) 717 iounmap(cru_rom_addr); 718 } 719 #else /* !CONFIG_HPWDT_NMI_DECODING */ 720 static void __devinit hpwdt_check_nmi_decoding(struct pci_dev *dev) 721 { 722 } 723 724 static int __devinit hpwdt_init_nmi_decoding(struct pci_dev *dev) 725 { 726 return 0; 727 } 728 729 static void __devexit hpwdt_exit_nmi_decoding(void) 730 { 731 } 732 #endif /* CONFIG_HPWDT_NMI_DECODING */ 733 734 static int __devinit hpwdt_init_one(struct pci_dev *dev, 735 const struct pci_device_id *ent) 736 { 737 int retval; 738 739 /* 740 * Check if we can do NMI decoding or not 741 */ 742 hpwdt_check_nmi_decoding(dev); 743 744 /* 745 * First let's find out if we are on an iLO2+ server. We will 746 * not run on a legacy ASM box. 747 * So we only support the G5 ProLiant servers and higher. 748 */ 749 if (dev->subsystem_vendor != PCI_VENDOR_ID_HP) { 750 dev_warn(&dev->dev, 751 "This server does not have an iLO2+ ASIC.\n"); 752 return -ENODEV; 753 } 754 755 if (pci_enable_device(dev)) { 756 dev_warn(&dev->dev, 757 "Not possible to enable PCI Device: 0x%x:0x%x.\n", 758 ent->vendor, ent->device); 759 return -ENODEV; 760 } 761 762 pci_mem_addr = pci_iomap(dev, 1, 0x80); 763 if (!pci_mem_addr) { 764 dev_warn(&dev->dev, 765 "Unable to detect the iLO2+ server memory.\n"); 766 retval = -ENOMEM; 767 goto error_pci_iomap; 768 } 769 hpwdt_timer_reg = pci_mem_addr + 0x70; 770 hpwdt_timer_con = pci_mem_addr + 0x72; 771 772 /* Make sure that we have a valid soft_margin */ 773 if (hpwdt_change_timer(soft_margin)) 774 hpwdt_change_timer(DEFAULT_MARGIN); 775 776 /* Initialize NMI Decoding functionality */ 777 retval = hpwdt_init_nmi_decoding(dev); 778 if (retval != 0) 779 goto error_init_nmi_decoding; 780 781 retval = misc_register(&hpwdt_miscdev); 782 if (retval < 0) { 783 dev_warn(&dev->dev, 784 "Unable to register miscdev on minor=%d (err=%d).\n", 785 WATCHDOG_MINOR, retval); 786 goto error_misc_register; 787 } 788 789 dev_info(&dev->dev, "HP Watchdog Timer Driver: %s" 790 ", timer margin: %d seconds (nowayout=%d).\n", 791 HPWDT_VERSION, soft_margin, nowayout); 792 return 0; 793 794 error_misc_register: 795 hpwdt_exit_nmi_decoding(); 796 error_init_nmi_decoding: 797 pci_iounmap(dev, pci_mem_addr); 798 error_pci_iomap: 799 pci_disable_device(dev); 800 return retval; 801 } 802 803 static void __devexit hpwdt_exit(struct pci_dev *dev) 804 { 805 if (!nowayout) 806 hpwdt_stop(); 807 808 misc_deregister(&hpwdt_miscdev); 809 hpwdt_exit_nmi_decoding(); 810 pci_iounmap(dev, pci_mem_addr); 811 pci_disable_device(dev); 812 } 813 814 static struct pci_driver hpwdt_driver = { 815 .name = "hpwdt", 816 .id_table = hpwdt_devices, 817 .probe = hpwdt_init_one, 818 .remove = __devexit_p(hpwdt_exit), 819 }; 820 821 static void __exit hpwdt_cleanup(void) 822 { 823 pci_unregister_driver(&hpwdt_driver); 824 } 825 826 static int __init hpwdt_init(void) 827 { 828 return pci_register_driver(&hpwdt_driver); 829 } 830 831 MODULE_AUTHOR("Tom Mingarelli"); 832 MODULE_DESCRIPTION("hp watchdog driver"); 833 MODULE_LICENSE("GPL"); 834 MODULE_VERSION(HPWDT_VERSION); 835 MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR); 836 837 module_param(soft_margin, int, 0); 838 MODULE_PARM_DESC(soft_margin, "Watchdog timeout in seconds"); 839 840 module_param(nowayout, int, 0); 841 MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=" 842 __MODULE_STRING(WATCHDOG_NOWAYOUT) ")"); 843 844 #ifdef CONFIG_HPWDT_NMI_DECODING 845 module_param(allow_kdump, int, 0); 846 MODULE_PARM_DESC(allow_kdump, "Start a kernel dump after NMI occurs"); 847 848 module_param(priority, int, 0); 849 MODULE_PARM_DESC(priority, "The hpwdt driver handles NMIs first or last" 850 " (default = 0/Last)\n"); 851 #endif /* !CONFIG_HPWDT_NMI_DECODING */ 852 853 module_init(hpwdt_init); 854 module_exit(hpwdt_cleanup); 855