xref: /openbmc/linux/drivers/watchdog/hpwdt.c (revision 9ac8d3fb)
1 /*
2  *	HP WatchDog Driver
3  *	based on
4  *
5  *	SoftDog	0.05:	A Software Watchdog Device
6  *
7  *	(c) Copyright 2007 Hewlett-Packard Development Company, L.P.
8  *	Thomas Mingarelli <thomas.mingarelli@hp.com>
9  *
10  *	This program is free software; you can redistribute it and/or
11  *	modify it under the terms of the GNU General Public License
12  *	version 2 as published by the Free Software Foundation
13  *
14  */
15 
16 #include <linux/device.h>
17 #include <linux/fs.h>
18 #include <linux/init.h>
19 #include <linux/interrupt.h>
20 #include <linux/io.h>
21 #include <linux/irq.h>
22 #include <linux/kernel.h>
23 #include <linux/miscdevice.h>
24 #include <linux/mm.h>
25 #include <linux/module.h>
26 #include <linux/kdebug.h>
27 #include <linux/moduleparam.h>
28 #include <linux/notifier.h>
29 #include <linux/pci.h>
30 #include <linux/pci_ids.h>
31 #include <linux/reboot.h>
32 #include <linux/sched.h>
33 #include <linux/timer.h>
34 #include <linux/types.h>
35 #include <linux/uaccess.h>
36 #include <linux/watchdog.h>
37 #include <linux/dmi.h>
38 #include <linux/efi.h>
39 #include <linux/string.h>
40 #include <linux/bootmem.h>
41 #include <linux/slab.h>
42 #include <asm/desc.h>
43 
44 #define PCI_BIOS32_SD_VALUE		0x5F32335F	/* "_32_" */
45 #define CRU_BIOS_SIGNATURE_VALUE	0x55524324
46 #define PCI_BIOS32_PARAGRAPH_LEN	16
47 #define PCI_ROM_BASE1			0x000F0000
48 #define ROM_SIZE			0x10000
49 
50 struct bios32_service_dir {
51 	u32 signature;
52 	u32 entry_point;
53 	u8 revision;
54 	u8 length;
55 	u8 checksum;
56 	u8 reserved[5];
57 };
58 
59 /* type 212 */
60 struct smbios_cru64_info {
61 	u8 type;
62 	u8 byte_length;
63 	u16 handle;
64 	u32 signature;
65 	u64 physical_address;
66 	u32 double_length;
67 	u32 double_offset;
68 };
69 #define SMBIOS_CRU64_INFORMATION	212
70 
71 struct cmn_registers {
72 	union {
73 		struct {
74 			u8 ral;
75 			u8 rah;
76 			u16 rea2;
77 		};
78 		u32 reax;
79 	} u1;
80 	union {
81 		struct {
82 			u8 rbl;
83 			u8 rbh;
84 			u8 reb2l;
85 			u8 reb2h;
86 		};
87 		u32 rebx;
88 	} u2;
89 	union {
90 		struct {
91 			u8 rcl;
92 			u8 rch;
93 			u16 rec2;
94 		};
95 		u32 recx;
96 	} u3;
97 	union {
98 		struct {
99 			u8 rdl;
100 			u8 rdh;
101 			u16 red2;
102 		};
103 		u32 redx;
104 	} u4;
105 
106 	u32 resi;
107 	u32 redi;
108 	u16 rds;
109 	u16 res;
110 	u32 reflags;
111 }  __attribute__((packed));
112 
113 #define DEFAULT_MARGIN	30
114 static unsigned int soft_margin = DEFAULT_MARGIN;	/* in seconds */
115 static unsigned int reload;			/* the computed soft_margin */
116 static int nowayout = WATCHDOG_NOWAYOUT;
117 static char expect_release;
118 static unsigned long hpwdt_is_open;
119 static unsigned int allow_kdump;
120 
121 static void __iomem *pci_mem_addr;		/* the PCI-memory address */
122 static unsigned long __iomem *hpwdt_timer_reg;
123 static unsigned long __iomem *hpwdt_timer_con;
124 
125 static DEFINE_SPINLOCK(rom_lock);
126 
127 static void *cru_rom_addr;
128 
129 static struct cmn_registers cmn_regs;
130 
131 static struct pci_device_id hpwdt_devices[] = {
132 	{
133 	 .vendor = PCI_VENDOR_ID_COMPAQ,
134 	 .device = 0xB203,
135 	 .subvendor = PCI_ANY_ID,
136 	 .subdevice = PCI_ANY_ID,
137 	},
138 	{0},			/* terminate list */
139 };
140 MODULE_DEVICE_TABLE(pci, hpwdt_devices);
141 
142 extern asmlinkage void asminline_call(struct cmn_registers *pi86Regs, unsigned long *pRomEntry);
143 
144 #ifndef CONFIG_X86_64
145 /* --32 Bit Bios------------------------------------------------------------ */
146 
147 #define HPWDT_ARCH	32
148 
149 asm(".text                          \n\t"
150     ".align 4                       \n"
151     "asminline_call:                \n\t"
152     "pushl       %ebp               \n\t"
153     "movl        %esp, %ebp         \n\t"
154     "pusha                          \n\t"
155     "pushf                          \n\t"
156     "push        %es                \n\t"
157     "push        %ds                \n\t"
158     "pop         %es                \n\t"
159     "movl        8(%ebp),%eax       \n\t"
160     "movl        4(%eax),%ebx       \n\t"
161     "movl        8(%eax),%ecx       \n\t"
162     "movl        12(%eax),%edx      \n\t"
163     "movl        16(%eax),%esi      \n\t"
164     "movl        20(%eax),%edi      \n\t"
165     "movl        (%eax),%eax        \n\t"
166     "push        %cs                \n\t"
167     "call        *12(%ebp)          \n\t"
168     "pushf                          \n\t"
169     "pushl       %eax               \n\t"
170     "movl        8(%ebp),%eax       \n\t"
171     "movl        %ebx,4(%eax)       \n\t"
172     "movl        %ecx,8(%eax)       \n\t"
173     "movl        %edx,12(%eax)      \n\t"
174     "movl        %esi,16(%eax)      \n\t"
175     "movl        %edi,20(%eax)      \n\t"
176     "movw        %ds,24(%eax)       \n\t"
177     "movw        %es,26(%eax)       \n\t"
178     "popl        %ebx               \n\t"
179     "movl        %ebx,(%eax)        \n\t"
180     "popl        %ebx               \n\t"
181     "movl        %ebx,28(%eax)      \n\t"
182     "pop         %es                \n\t"
183     "popf                           \n\t"
184     "popa                           \n\t"
185     "leave                          \n\t"
186     "ret                            \n\t"
187     ".previous");
188 
189 
190 /*
191  *	cru_detect
192  *
193  *	Routine Description:
194  *	This function uses the 32-bit BIOS Service Directory record to
195  *	search for a $CRU record.
196  *
197  *	Return Value:
198  *	0        :  SUCCESS
199  *	<0       :  FAILURE
200  */
201 static int __devinit cru_detect(unsigned long map_entry,
202 	unsigned long map_offset)
203 {
204 	void *bios32_map;
205 	unsigned long *bios32_entrypoint;
206 	unsigned long cru_physical_address;
207 	unsigned long cru_length;
208 	unsigned long physical_bios_base = 0;
209 	unsigned long physical_bios_offset = 0;
210 	int retval = -ENODEV;
211 
212 	bios32_map = ioremap(map_entry, (2 * PAGE_SIZE));
213 
214 	if (bios32_map == NULL)
215 		return -ENODEV;
216 
217 	bios32_entrypoint = bios32_map + map_offset;
218 
219 	cmn_regs.u1.reax = CRU_BIOS_SIGNATURE_VALUE;
220 
221 	asminline_call(&cmn_regs, bios32_entrypoint);
222 
223 	if (cmn_regs.u1.ral != 0) {
224 		printk(KERN_WARNING
225 			"hpwdt: Call succeeded but with an error: 0x%x\n",
226 			cmn_regs.u1.ral);
227 	} else {
228 		physical_bios_base = cmn_regs.u2.rebx;
229 		physical_bios_offset = cmn_regs.u4.redx;
230 		cru_length = cmn_regs.u3.recx;
231 		cru_physical_address =
232 			physical_bios_base + physical_bios_offset;
233 
234 		/* If the values look OK, then map it in. */
235 		if ((physical_bios_base + physical_bios_offset)) {
236 			cru_rom_addr =
237 				ioremap(cru_physical_address, cru_length);
238 			if (cru_rom_addr)
239 				retval = 0;
240 		}
241 
242 		printk(KERN_DEBUG "hpwdt: CRU Base Address:   0x%lx\n",
243 			physical_bios_base);
244 		printk(KERN_DEBUG "hpwdt: CRU Offset Address: 0x%lx\n",
245 			physical_bios_offset);
246 		printk(KERN_DEBUG "hpwdt: CRU Length:         0x%lx\n",
247 			cru_length);
248 		printk(KERN_DEBUG "hpwdt: CRU Mapped Address: 0x%x\n",
249 			(unsigned int)&cru_rom_addr);
250 	}
251 	iounmap(bios32_map);
252 	return retval;
253 }
254 
255 /*
256  *	bios_checksum
257  */
258 static int __devinit bios_checksum(const char __iomem *ptr, int len)
259 {
260 	char sum = 0;
261 	int i;
262 
263 	/*
264 	 * calculate checksum of size bytes. This should add up
265 	 * to zero if we have a valid header.
266 	 */
267 	for (i = 0; i < len; i++)
268 		sum += ptr[i];
269 
270 	return ((sum == 0) && (len > 0));
271 }
272 
273 /*
274  *	bios32_present
275  *
276  *	Routine Description:
277  *	This function finds the 32-bit BIOS Service Directory
278  *
279  *	Return Value:
280  *	0        :  SUCCESS
281  *	<0       :  FAILURE
282  */
283 static int __devinit bios32_present(const char __iomem *p)
284 {
285 	struct bios32_service_dir *bios_32_ptr;
286 	int length;
287 	unsigned long map_entry, map_offset;
288 
289 	bios_32_ptr = (struct bios32_service_dir *) p;
290 
291 	/*
292 	 * Search for signature by checking equal to the swizzled value
293 	 * instead of calling another routine to perform a strcmp.
294 	 */
295 	if (bios_32_ptr->signature == PCI_BIOS32_SD_VALUE) {
296 		length = bios_32_ptr->length * PCI_BIOS32_PARAGRAPH_LEN;
297 		if (bios_checksum(p, length)) {
298 			/*
299 			 * According to the spec, we're looking for the
300 			 * first 4KB-aligned address below the entrypoint
301 			 * listed in the header. The Service Directory code
302 			 * is guaranteed to occupy no more than 2 4KB pages.
303 			 */
304 			map_entry = bios_32_ptr->entry_point & ~(PAGE_SIZE - 1);
305 			map_offset = bios_32_ptr->entry_point - map_entry;
306 
307 			return cru_detect(map_entry, map_offset);
308 		}
309 	}
310 	return -ENODEV;
311 }
312 
313 static int __devinit detect_cru_service(void)
314 {
315 	char __iomem *p, *q;
316 	int rc = -1;
317 
318 	/*
319 	 * Search from 0x0f0000 through 0x0fffff, inclusive.
320 	 */
321 	p = ioremap(PCI_ROM_BASE1, ROM_SIZE);
322 	if (p == NULL)
323 		return -ENOMEM;
324 
325 	for (q = p; q < p + ROM_SIZE; q += 16) {
326 		rc = bios32_present(q);
327 		if (!rc)
328 			break;
329 	}
330 	iounmap(p);
331 	return rc;
332 }
333 
334 #else
335 /* --64 Bit Bios------------------------------------------------------------ */
336 
337 #define HPWDT_ARCH	64
338 
339 asm(".text                      \n\t"
340     ".align 4                   \n"
341     "asminline_call:            \n\t"
342     "pushq      %rbp            \n\t"
343     "movq       %rsp, %rbp      \n\t"
344     "pushq      %rax            \n\t"
345     "pushq      %rbx            \n\t"
346     "pushq      %rdx            \n\t"
347     "pushq      %r12            \n\t"
348     "pushq      %r9             \n\t"
349     "movq       %rsi, %r12      \n\t"
350     "movq       %rdi, %r9       \n\t"
351     "movl       4(%r9),%ebx     \n\t"
352     "movl       8(%r9),%ecx     \n\t"
353     "movl       12(%r9),%edx    \n\t"
354     "movl       16(%r9),%esi    \n\t"
355     "movl       20(%r9),%edi    \n\t"
356     "movl       (%r9),%eax      \n\t"
357     "call       *%r12           \n\t"
358     "pushfq                     \n\t"
359     "popq        %r12           \n\t"
360     "movl       %eax, (%r9)     \n\t"
361     "movl       %ebx, 4(%r9)    \n\t"
362     "movl       %ecx, 8(%r9)    \n\t"
363     "movl       %edx, 12(%r9)   \n\t"
364     "movl       %esi, 16(%r9)   \n\t"
365     "movl       %edi, 20(%r9)   \n\t"
366     "movq       %r12, %rax      \n\t"
367     "movl       %eax, 28(%r9)   \n\t"
368     "popq       %r9             \n\t"
369     "popq       %r12            \n\t"
370     "popq       %rdx            \n\t"
371     "popq       %rbx            \n\t"
372     "popq       %rax            \n\t"
373     "leave                      \n\t"
374     "ret                        \n\t"
375     ".previous");
376 
377 /*
378  *	dmi_find_cru
379  *
380  *	Routine Description:
381  *	This function checks whether or not a SMBIOS/DMI record is
382  *	the 64bit CRU info or not
383  */
384 static void __devinit dmi_find_cru(const struct dmi_header *dm)
385 {
386 	struct smbios_cru64_info *smbios_cru64_ptr;
387 	unsigned long cru_physical_address;
388 
389 	if (dm->type == SMBIOS_CRU64_INFORMATION) {
390 		smbios_cru64_ptr = (struct smbios_cru64_info *) dm;
391 		if (smbios_cru64_ptr->signature == CRU_BIOS_SIGNATURE_VALUE) {
392 			cru_physical_address =
393 				smbios_cru64_ptr->physical_address +
394 				smbios_cru64_ptr->double_offset;
395 			cru_rom_addr = ioremap(cru_physical_address,
396 				smbios_cru64_ptr->double_length);
397 		}
398 	}
399 }
400 
401 static int __devinit detect_cru_service(void)
402 {
403 	cru_rom_addr = NULL;
404 
405 	dmi_walk(dmi_find_cru);
406 
407 	/* if cru_rom_addr has been set then we found a CRU service */
408 	return ((cru_rom_addr != NULL) ? 0 : -ENODEV);
409 }
410 
411 /* ------------------------------------------------------------------------- */
412 
413 #endif
414 
415 /*
416  *	Watchdog operations
417  */
418 static void hpwdt_start(void)
419 {
420 	reload = (soft_margin * 1000) / 128;
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 	/* Arbitrary, can't find the card's limits */
442 	if (new_margin < 30 || new_margin > 600) {
443 		printk(KERN_WARNING
444 			"hpwdt: New value passed in is invalid: %d seconds.\n",
445 			new_margin);
446 		return -EINVAL;
447 	}
448 
449 	soft_margin = new_margin;
450 	printk(KERN_DEBUG
451 		"hpwdt: New timer passed in is %d seconds.\n",
452 		new_margin);
453 	reload = (soft_margin * 1000) / 128;
454 
455 	return 0;
456 }
457 
458 /*
459  *	NMI Handler
460  */
461 static int hpwdt_pretimeout(struct notifier_block *nb, unsigned long ulReason,
462 				void *data)
463 {
464 	unsigned long rom_pl;
465 	static int die_nmi_called;
466 
467 	if (ulReason != DIE_NMI && ulReason != DIE_NMI_IPI)
468 		return NOTIFY_OK;
469 
470 	spin_lock_irqsave(&rom_lock, rom_pl);
471 	if (!die_nmi_called)
472 		asminline_call(&cmn_regs, cru_rom_addr);
473 	die_nmi_called = 1;
474 	spin_unlock_irqrestore(&rom_lock, rom_pl);
475 	if (cmn_regs.u1.ral == 0) {
476 		printk(KERN_WARNING "hpwdt: An NMI occurred, "
477 			"but unable to determine source.\n");
478 	} else {
479 		if (allow_kdump)
480 			hpwdt_stop();
481 		panic("An NMI occurred, please see the Integrated "
482 			"Management Log for details.\n");
483 	}
484 
485 	return NOTIFY_STOP;
486 }
487 
488 /*
489  *	/dev/watchdog handling
490  */
491 static int hpwdt_open(struct inode *inode, struct file *file)
492 {
493 	/* /dev/watchdog can only be opened once */
494 	if (test_and_set_bit(0, &hpwdt_is_open))
495 		return -EBUSY;
496 
497 	/* Start the watchdog */
498 	hpwdt_start();
499 	hpwdt_ping();
500 
501 	return nonseekable_open(inode, file);
502 }
503 
504 static int hpwdt_release(struct inode *inode, struct file *file)
505 {
506 	/* Stop the watchdog */
507 	if (expect_release == 42) {
508 		hpwdt_stop();
509 	} else {
510 		printk(KERN_CRIT
511 			"hpwdt: Unexpected close, not stopping watchdog!\n");
512 		hpwdt_ping();
513 	}
514 
515 	expect_release = 0;
516 
517 	/* /dev/watchdog is being closed, make sure it can be re-opened */
518 	clear_bit(0, &hpwdt_is_open);
519 
520 	return 0;
521 }
522 
523 static ssize_t hpwdt_write(struct file *file, const char __user *data,
524 	size_t len, loff_t *ppos)
525 {
526 	/* See if we got the magic character 'V' and reload the timer */
527 	if (len) {
528 		if (!nowayout) {
529 			size_t i;
530 
531 			/* note: just in case someone wrote the magic character
532 			 * five months ago... */
533 			expect_release = 0;
534 
535 			/* scan to see whether or not we got the magic char. */
536 			for (i = 0; i != len; i++) {
537 				char c;
538 				if (get_user(c, data + i))
539 					return -EFAULT;
540 				if (c == 'V')
541 					expect_release = 42;
542 			}
543 		}
544 
545 		/* someone wrote to us, we should reload the timer */
546 		hpwdt_ping();
547 	}
548 
549 	return len;
550 }
551 
552 static struct watchdog_info ident = {
553 	.options = WDIOF_SETTIMEOUT |
554 		   WDIOF_KEEPALIVEPING |
555 		   WDIOF_MAGICCLOSE,
556 	.identity = "HP iLO2 HW Watchdog Timer",
557 };
558 
559 static long hpwdt_ioctl(struct file *file, unsigned int cmd,
560 	unsigned long arg)
561 {
562 	void __user *argp = (void __user *)arg;
563 	int __user *p = argp;
564 	int new_margin;
565 	int ret = -ENOTTY;
566 
567 	switch (cmd) {
568 	case WDIOC_GETSUPPORT:
569 		ret = 0;
570 		if (copy_to_user(argp, &ident, sizeof(ident)))
571 			ret = -EFAULT;
572 		break;
573 
574 	case WDIOC_GETSTATUS:
575 	case WDIOC_GETBOOTSTATUS:
576 		ret = put_user(0, p);
577 		break;
578 
579 	case WDIOC_KEEPALIVE:
580 		hpwdt_ping();
581 		ret = 0;
582 		break;
583 
584 	case WDIOC_SETTIMEOUT:
585 		ret = get_user(new_margin, p);
586 		if (ret)
587 			break;
588 
589 		ret = hpwdt_change_timer(new_margin);
590 		if (ret)
591 			break;
592 
593 		hpwdt_ping();
594 		/* Fall */
595 	case WDIOC_GETTIMEOUT:
596 		ret = put_user(soft_margin, p);
597 		break;
598 	}
599 	return ret;
600 }
601 
602 /*
603  *	Kernel interfaces
604  */
605 static struct file_operations hpwdt_fops = {
606 	.owner = THIS_MODULE,
607 	.llseek = no_llseek,
608 	.write = hpwdt_write,
609 	.unlocked_ioctl = hpwdt_ioctl,
610 	.open = hpwdt_open,
611 	.release = hpwdt_release,
612 };
613 
614 static struct miscdevice hpwdt_miscdev = {
615 	.minor = WATCHDOG_MINOR,
616 	.name = "watchdog",
617 	.fops = &hpwdt_fops,
618 };
619 
620 static struct notifier_block die_notifier = {
621 	.notifier_call = hpwdt_pretimeout,
622 	.priority = 0x7FFFFFFF,
623 };
624 
625 /*
626  *	Init & Exit
627  */
628 
629 static int __devinit hpwdt_init_one(struct pci_dev *dev,
630 					const struct pci_device_id *ent)
631 {
632 	int retval;
633 
634 	/*
635 	 * First let's find out if we are on an iLO2 server. We will
636 	 * not run on a legacy ASM box.
637 	 * So we only support the G5 ProLiant servers and higher.
638 	 */
639 	if (dev->subsystem_vendor != PCI_VENDOR_ID_HP) {
640 		dev_warn(&dev->dev,
641 			"This server does not have an iLO2 ASIC.\n");
642 		return -ENODEV;
643 	}
644 
645 	if (pci_enable_device(dev)) {
646 		dev_warn(&dev->dev,
647 			"Not possible to enable PCI Device: 0x%x:0x%x.\n",
648 			ent->vendor, ent->device);
649 		return -ENODEV;
650 	}
651 
652 	pci_mem_addr = pci_iomap(dev, 1, 0x80);
653 	if (!pci_mem_addr) {
654 		dev_warn(&dev->dev,
655 			"Unable to detect the iLO2 server memory.\n");
656 		retval = -ENOMEM;
657 		goto error_pci_iomap;
658 	}
659 	hpwdt_timer_reg = pci_mem_addr + 0x70;
660 	hpwdt_timer_con = pci_mem_addr + 0x72;
661 
662 	/* Make sure that we have a valid soft_margin */
663 	if (hpwdt_change_timer(soft_margin))
664 		hpwdt_change_timer(DEFAULT_MARGIN);
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 		goto error_get_cru;
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 	retval = register_die_notifier(&die_notifier);
688 	if (retval != 0) {
689 		dev_warn(&dev->dev,
690 			"Unable to register a die notifier (err=%d).\n",
691 			retval);
692 		goto error_die_notifier;
693 	}
694 
695 	retval = misc_register(&hpwdt_miscdev);
696 	if (retval < 0) {
697 		dev_warn(&dev->dev,
698 			"Unable to register miscdev on minor=%d (err=%d).\n",
699 			WATCHDOG_MINOR, retval);
700 		goto error_misc_register;
701 	}
702 
703 	printk(KERN_INFO
704 		"hp Watchdog Timer Driver: 1.00"
705 		", timer margin: %d seconds (nowayout=%d)"
706 		", allow kernel dump: %s (default = 0/OFF).\n",
707 		soft_margin, nowayout, (allow_kdump == 0) ? "OFF" : "ON");
708 
709 	return 0;
710 
711 error_misc_register:
712 	unregister_die_notifier(&die_notifier);
713 error_die_notifier:
714 	if (cru_rom_addr)
715 		iounmap(cru_rom_addr);
716 error_get_cru:
717 	pci_iounmap(dev, pci_mem_addr);
718 error_pci_iomap:
719 	pci_disable_device(dev);
720 	return retval;
721 }
722 
723 static void __devexit hpwdt_exit(struct pci_dev *dev)
724 {
725 	if (!nowayout)
726 		hpwdt_stop();
727 
728 	misc_deregister(&hpwdt_miscdev);
729 	unregister_die_notifier(&die_notifier);
730 
731 	if (cru_rom_addr)
732 		iounmap(cru_rom_addr);
733 	pci_iounmap(dev, pci_mem_addr);
734 	pci_disable_device(dev);
735 }
736 
737 static struct pci_driver hpwdt_driver = {
738 	.name = "hpwdt",
739 	.id_table = hpwdt_devices,
740 	.probe = hpwdt_init_one,
741 	.remove = __devexit_p(hpwdt_exit),
742 };
743 
744 static void __exit hpwdt_cleanup(void)
745 {
746 	pci_unregister_driver(&hpwdt_driver);
747 }
748 
749 static int __init hpwdt_init(void)
750 {
751 	return pci_register_driver(&hpwdt_driver);
752 }
753 
754 MODULE_AUTHOR("Tom Mingarelli");
755 MODULE_DESCRIPTION("hp watchdog driver");
756 MODULE_LICENSE("GPL");
757 MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
758 
759 module_param(soft_margin, int, 0);
760 MODULE_PARM_DESC(soft_margin, "Watchdog timeout in seconds");
761 
762 module_param(allow_kdump, int, 0);
763 MODULE_PARM_DESC(allow_kdump, "Start a kernel dump after NMI occurs");
764 
765 module_param(nowayout, int, 0);
766 MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default="
767 		__MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
768 
769 module_init(hpwdt_init);
770 module_exit(hpwdt_cleanup);
771