xref: /openbmc/linux/drivers/watchdog/hpwdt.c (revision 22246614)
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/dmi.h>
43 #include <asm/desc.h>
44 #include <asm/kdebug.h>
45 
46 #define PCI_BIOS32_SD_VALUE		0x5F32335F	/* "_32_" */
47 #define CRU_BIOS_SIGNATURE_VALUE	0x55524324
48 #define PCI_BIOS32_PARAGRAPH_LEN	16
49 #define PCI_ROM_BASE1			0x000F0000
50 #define ROM_SIZE			0x10000
51 
52 struct bios32_service_dir {
53 	u32 signature;
54 	u32 entry_point;
55 	u8 revision;
56 	u8 length;
57 	u8 checksum;
58 	u8 reserved[5];
59 };
60 
61 /* type 212 */
62 struct smbios_cru64_info {
63 	u8 type;
64 	u8 byte_length;
65 	u16 handle;
66 	u32 signature;
67 	u64 physical_address;
68 	u32 double_length;
69 	u32 double_offset;
70 };
71 #define SMBIOS_CRU64_INFORMATION	212
72 
73 struct cmn_registers {
74 	union {
75 		struct {
76 			u8 ral;
77 			u8 rah;
78 			u16 rea2;
79 		};
80 		u32 reax;
81 	} u1;
82 	union {
83 		struct {
84 			u8 rbl;
85 			u8 rbh;
86 			u8 reb2l;
87 			u8 reb2h;
88 		};
89 		u32 rebx;
90 	} u2;
91 	union {
92 		struct {
93 			u8 rcl;
94 			u8 rch;
95 			u16 rec2;
96 		};
97 		u32 recx;
98 	} u3;
99 	union {
100 		struct {
101 			u8 rdl;
102 			u8 rdh;
103 			u16 red2;
104 		};
105 		u32 redx;
106 	} u4;
107 
108 	u32 resi;
109 	u32 redi;
110 	u16 rds;
111 	u16 res;
112 	u32 reflags;
113 }  __attribute__((packed));
114 
115 #define DEFAULT_MARGIN	30
116 static unsigned int soft_margin = DEFAULT_MARGIN;	/* in seconds */
117 static unsigned int reload;			/* the computed soft_margin */
118 static int nowayout = WATCHDOG_NOWAYOUT;
119 static char expect_release;
120 static unsigned long hpwdt_is_open;
121 
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 #ifndef CONFIG_X86_64
144 /* --32 Bit Bios------------------------------------------------------------ */
145 
146 #define HPWDT_ARCH	32
147 
148 static void asminline_call(struct cmn_registers *pi86Regs,
149 			   unsigned long *pRomEntry)
150 {
151 	asm("pushl       %ebp               \n\t"
152 	    "movl        %esp, %ebp         \n\t"
153 	    "pusha                          \n\t"
154 	    "pushf                          \n\t"
155 	    "push        %es                \n\t"
156 	    "push        %ds                \n\t"
157 	    "pop         %es                \n\t"
158 	    "movl        8(%ebp),%eax       \n\t"
159 	    "movl        4(%eax),%ebx       \n\t"
160 	    "movl        8(%eax),%ecx       \n\t"
161 	    "movl        12(%eax),%edx      \n\t"
162 	    "movl        16(%eax),%esi      \n\t"
163 	    "movl        20(%eax),%edi      \n\t"
164 	    "movl        (%eax),%eax        \n\t"
165 	    "push        %cs                \n\t"
166 	    "call        *12(%ebp)          \n\t"
167 	    "pushf                          \n\t"
168 	    "pushl       %eax               \n\t"
169 	    "movl        8(%ebp),%eax       \n\t"
170 	    "movl        %ebx,4(%eax)       \n\t"
171 	    "movl        %ecx,8(%eax)       \n\t"
172 	    "movl        %edx,12(%eax)      \n\t"
173 	    "movl        %esi,16(%eax)      \n\t"
174 	    "movl        %edi,20(%eax)      \n\t"
175 	    "movw        %ds,24(%eax)       \n\t"
176 	    "movw        %es,26(%eax)       \n\t"
177 	    "popl        %ebx               \n\t"
178 	    "movl        %ebx,(%eax)        \n\t"
179 	    "popl        %ebx               \n\t"
180 	    "movl        %ebx,28(%eax)      \n\t"
181 	    "pop         %es                \n\t"
182 	    "popf                           \n\t"
183 	    "popa                           \n\t"
184 	    "leave                          \n\t" "ret");
185 }
186 
187 /*
188  *	cru_detect
189  *
190  *	Routine Description:
191  *	This function uses the 32-bit BIOS Service Directory record to
192  *	search for a $CRU record.
193  *
194  *	Return Value:
195  *	0        :  SUCCESS
196  *	<0       :  FAILURE
197  */
198 static int __devinit cru_detect(unsigned long map_entry,
199 	unsigned long map_offset)
200 {
201 	void *bios32_map;
202 	unsigned long *bios32_entrypoint;
203 	unsigned long cru_physical_address;
204 	unsigned long cru_length;
205 	unsigned long physical_bios_base = 0;
206 	unsigned long physical_bios_offset = 0;
207 	int retval = -ENODEV;
208 
209 	bios32_map = ioremap(map_entry, (2 * PAGE_SIZE));
210 
211 	if (bios32_map == NULL)
212 		return -ENODEV;
213 
214 	bios32_entrypoint = bios32_map + map_offset;
215 
216 	cmn_regs.u1.reax = CRU_BIOS_SIGNATURE_VALUE;
217 
218 	asminline_call(&cmn_regs, bios32_entrypoint);
219 
220 	if (cmn_regs.u1.ral != 0) {
221 		printk(KERN_WARNING
222 		       "hpwdt: Call succeeded but with an error: 0x%x\n",
223 		       cmn_regs.u1.ral);
224 	} else {
225 		physical_bios_base = cmn_regs.u2.rebx;
226 		physical_bios_offset = cmn_regs.u4.redx;
227 		cru_length = cmn_regs.u3.recx;
228 		cru_physical_address =
229 		    physical_bios_base + physical_bios_offset;
230 
231 		/* If the values look OK, then map it in. */
232 		if ((physical_bios_base + physical_bios_offset)) {
233 			cru_rom_addr =
234 			    ioremap(cru_physical_address, cru_length);
235 			if (cru_rom_addr)
236 				retval = 0;
237 		}
238 
239 		printk(KERN_DEBUG "hpwdt: CRU Base Address:   0x%lx\n",
240 			physical_bios_base);
241 		printk(KERN_DEBUG "hpwdt: CRU Offset Address: 0x%lx\n",
242 			physical_bios_offset);
243 		printk(KERN_DEBUG "hpwdt: CRU Length:         0x%lx\n",
244 			cru_length);
245 		printk(KERN_DEBUG "hpwdt: CRU Mapped Address: 0x%x\n",
246 			(unsigned int)&cru_rom_addr);
247 	}
248 	iounmap(bios32_map);
249 	return retval;
250 }
251 
252 /*
253  *	bios_checksum
254  */
255 static int __devinit bios_checksum(const char __iomem *ptr, int len)
256 {
257 	char sum = 0;
258 	int i;
259 
260 	/*
261 	 * calculate checksum of size bytes. This should add up
262 	 * to zero if we have a valid header.
263 	 */
264 	for (i = 0; i < len; i++)
265 		sum += ptr[i];
266 
267 	return ((sum == 0) && (len > 0));
268 }
269 
270 /*
271  *	bios32_present
272  *
273  *	Routine Description:
274  *	This function finds the 32-bit BIOS Service Directory
275  *
276  *	Return Value:
277  *	0        :  SUCCESS
278  *	<0       :  FAILURE
279  */
280 static int __devinit bios32_present(const char __iomem *p)
281 {
282 	struct bios32_service_dir *bios_32_ptr;
283 	int length;
284 	unsigned long map_entry, map_offset;
285 
286 	bios_32_ptr = (struct bios32_service_dir *) p;
287 
288 	/*
289 	 * Search for signature by checking equal to the swizzled value
290 	 * instead of calling another routine to perform a strcmp.
291 	 */
292 	if (bios_32_ptr->signature == PCI_BIOS32_SD_VALUE) {
293 		length = bios_32_ptr->length * PCI_BIOS32_PARAGRAPH_LEN;
294 		if (bios_checksum(p, length)) {
295 			/*
296 			 * According to the spec, we're looking for the
297 			 * first 4KB-aligned address below the entrypoint
298 			 * listed in the header. The Service Directory code
299 			 * is guaranteed to occupy no more than 2 4KB pages.
300 			 */
301 			map_entry = bios_32_ptr->entry_point & ~(PAGE_SIZE - 1);
302 			map_offset = bios_32_ptr->entry_point - map_entry;
303 
304 			return cru_detect(map_entry, map_offset);
305 		}
306 	}
307 	return -ENODEV;
308 }
309 
310 static int __devinit detect_cru_service(void)
311 {
312 	char __iomem *p, *q;
313 	int rc = -1;
314 
315 	/*
316 	 * Search from 0x0f0000 through 0x0fffff, inclusive.
317 	 */
318 	p = ioremap(PCI_ROM_BASE1, ROM_SIZE);
319 	if (p == NULL)
320 		return -ENOMEM;
321 
322 	for (q = p; q < p + ROM_SIZE; q += 16) {
323 		rc = bios32_present(q);
324 		if (!rc)
325 			break;
326 	}
327 	iounmap(p);
328 	return rc;
329 }
330 
331 #else
332 /* --64 Bit Bios------------------------------------------------------------ */
333 
334 #define HPWDT_ARCH	64
335 
336 static void asminline_call(struct cmn_registers *pi86Regs,
337 			   unsigned long *pRomEntry)
338 {
339 	asm("pushq      %rbp            \n\t"
340 	    "movq       %rsp, %rbp      \n\t"
341 	    "pushq      %rax            \n\t"
342 	    "pushq      %rbx            \n\t"
343 	    "pushq      %rdx            \n\t"
344 	    "pushq      %r12            \n\t"
345 	    "pushq      %r9             \n\t"
346 	    "movq       %rsi, %r12      \n\t"
347 	    "movq       %rdi, %r9       \n\t"
348 	    "movl       4(%r9),%ebx     \n\t"
349 	    "movl       8(%r9),%ecx     \n\t"
350 	    "movl       12(%r9),%edx    \n\t"
351 	    "movl       16(%r9),%esi    \n\t"
352 	    "movl       20(%r9),%edi    \n\t"
353 	    "movl       (%r9),%eax      \n\t"
354 	    "call       *%r12           \n\t"
355 	    "pushfq                     \n\t"
356 	    "popq        %r12           \n\t"
357 	    "popfq                      \n\t"
358 	    "movl       %eax, (%r9)     \n\t"
359 	    "movl       %ebx, 4(%r9)    \n\t"
360 	    "movl       %ecx, 8(%r9)    \n\t"
361 	    "movl       %edx, 12(%r9)   \n\t"
362 	    "movl       %esi, 16(%r9)   \n\t"
363 	    "movl       %edi, 20(%r9)   \n\t"
364 	    "movq       %r12, %rax      \n\t"
365 	    "movl       %eax, 28(%r9)   \n\t"
366 	    "popq       %r9             \n\t"
367 	    "popq       %r12            \n\t"
368 	    "popq       %rdx            \n\t"
369 	    "popq       %rbx            \n\t"
370 	    "popq       %rax            \n\t"
371 	    "leave                      \n\t" "ret");
372 }
373 
374 /*
375  *	dmi_find_cru
376  *
377  *	Routine Description:
378  *	This function checks whether or not a SMBIOS/DMI record is
379  *	the 64bit CRU info or not
380  */
381 static void __devinit dmi_find_cru(const struct dmi_header *dm)
382 {
383 	struct smbios_cru64_info *smbios_cru64_ptr;
384 	unsigned long cru_physical_address;
385 
386 	if (dm->type == SMBIOS_CRU64_INFORMATION) {
387 		smbios_cru64_ptr = (struct smbios_cru64_info *) dm;
388 		if (smbios_cru64_ptr->signature == CRU_BIOS_SIGNATURE_VALUE) {
389 			cru_physical_address =
390 			    smbios_cru64_ptr->physical_address +
391 			    smbios_cru64_ptr->double_offset;
392 			cru_rom_addr = ioremap(cru_physical_address,
393 				    smbios_cru64_ptr->double_length);
394 		}
395 	}
396 }
397 
398 static int __devinit detect_cru_service(void)
399 {
400 	cru_rom_addr = NULL;
401 
402 	dmi_walk(dmi_find_cru);
403 
404 	/* if cru_rom_addr has been set then we found a CRU service */
405 	return ((cru_rom_addr != NULL)? 0: -ENODEV);
406 }
407 
408 /* ------------------------------------------------------------------------- */
409 
410 #endif
411 
412 /*
413  *	NMI Handler
414  */
415 static int hpwdt_pretimeout(struct notifier_block *nb, unsigned long ulReason,
416 			    void *data)
417 {
418 	static unsigned long rom_pl;
419 	static int die_nmi_called;
420 
421 	if (ulReason != DIE_NMI && ulReason != DIE_NMI_IPI)
422 		return NOTIFY_OK;
423 
424 	spin_lock_irqsave(&rom_lock, rom_pl);
425 	if (!die_nmi_called)
426 		asminline_call(&cmn_regs, cru_rom_addr);
427 	die_nmi_called = 1;
428 	spin_unlock_irqrestore(&rom_lock, rom_pl);
429 	if (cmn_regs.u1.ral == 0) {
430 		printk(KERN_WARNING "hpwdt: An NMI occurred, "
431 		       "but unable to determine source.\n");
432 	} else {
433 		panic("An NMI occurred, please see the Integrated "
434 			"Management Log for details.\n");
435 	}
436 
437 	return NOTIFY_STOP;
438 }
439 
440 /*
441  *	Watchdog operations
442  */
443 static void hpwdt_start(void)
444 {
445 	reload = (soft_margin * 1000) / 128;
446 	iowrite16(reload, hpwdt_timer_reg);
447 	iowrite16(0x85, hpwdt_timer_con);
448 }
449 
450 static void hpwdt_stop(void)
451 {
452 	unsigned long data;
453 
454 	data = ioread16(hpwdt_timer_con);
455 	data &= 0xFE;
456 	iowrite16(data, hpwdt_timer_con);
457 }
458 
459 static void hpwdt_ping(void)
460 {
461 	iowrite16(reload, hpwdt_timer_reg);
462 }
463 
464 static int hpwdt_change_timer(int new_margin)
465 {
466 	/* Arbitrary, can't find the card's limits */
467 	if (new_margin < 30 || new_margin > 600) {
468 		printk(KERN_WARNING
469 			"hpwdt: New value passed in is invalid: %d seconds.\n",
470 			new_margin);
471 		return -EINVAL;
472 	}
473 
474 	soft_margin = new_margin;
475 	printk(KERN_DEBUG
476 		"hpwdt: New timer passed in is %d seconds.\n",
477 		new_margin);
478 	reload = (soft_margin * 1000) / 128;
479 
480 	return 0;
481 }
482 
483 /*
484  *	/dev/watchdog handling
485  */
486 static int hpwdt_open(struct inode *inode, struct file *file)
487 {
488 	/* /dev/watchdog can only be opened once */
489 	if (test_and_set_bit(0, &hpwdt_is_open))
490 		return -EBUSY;
491 
492 	/* Start the watchdog */
493 	hpwdt_start();
494 	hpwdt_ping();
495 
496 	return nonseekable_open(inode, file);
497 }
498 
499 static int hpwdt_release(struct inode *inode, struct file *file)
500 {
501 	/* Stop the watchdog */
502 	if (expect_release == 42) {
503 		hpwdt_stop();
504 	} else {
505 		printk(KERN_CRIT
506 			"hpwdt: Unexpected close, not stopping watchdog!\n");
507 		hpwdt_ping();
508 	}
509 
510 	expect_release = 0;
511 
512 	/* /dev/watchdog is being closed, make sure it can be re-opened */
513 	clear_bit(0, &hpwdt_is_open);
514 
515 	return 0;
516 }
517 
518 static ssize_t hpwdt_write(struct file *file, const char __user *data,
519 	size_t len, loff_t *ppos)
520 {
521 	/* See if we got the magic character 'V' and reload the timer */
522 	if (len) {
523 		if (!nowayout) {
524 			size_t i;
525 
526 			/* note: just in case someone wrote the magic character
527 			 * five months ago... */
528 			expect_release = 0;
529 
530 			/* scan to see whether or not we got the magic char. */
531 			for (i = 0; i != len; i++) {
532 				char c;
533 				if (get_user(c, data+i))
534 					return -EFAULT;
535 				if (c == 'V')
536 					expect_release = 42;
537 			}
538 		}
539 
540 		/* someone wrote to us, we should reload the timer */
541 		hpwdt_ping();
542 	}
543 
544 	return len;
545 }
546 
547 static struct watchdog_info ident = {
548 	.options = WDIOF_SETTIMEOUT |
549 		   WDIOF_KEEPALIVEPING |
550 		   WDIOF_MAGICCLOSE,
551 	.identity = "HP iLO2 HW Watchdog Timer",
552 };
553 
554 static long hpwdt_ioctl(struct file *file, unsigned int cmd,
555 	unsigned long arg)
556 {
557 	void __user *argp = (void __user *)arg;
558 	int __user *p = argp;
559 	int new_margin;
560 	int ret = -ENOTTY;
561 
562 	switch (cmd) {
563 	case WDIOC_GETSUPPORT:
564 		ret = 0;
565 		if (copy_to_user(argp, &ident, sizeof(ident)))
566 			ret = -EFAULT;
567 		break;
568 
569 	case WDIOC_GETSTATUS:
570 	case WDIOC_GETBOOTSTATUS:
571 		ret = put_user(0, p);
572 		break;
573 
574 	case WDIOC_KEEPALIVE:
575 		hpwdt_ping();
576 		ret = 0;
577 		break;
578 
579 	case WDIOC_SETTIMEOUT:
580 		ret = get_user(new_margin, p);
581 		if (ret)
582 			break;
583 
584 		ret = hpwdt_change_timer(new_margin);
585 		if (ret)
586 			break;
587 
588 		hpwdt_ping();
589 		/* Fall */
590 	case WDIOC_GETTIMEOUT:
591 		ret = put_user(soft_margin, p);
592 		break;
593 	}
594 	return ret;
595 }
596 
597 /*
598  *	Kernel interfaces
599  */
600 static struct file_operations hpwdt_fops = {
601 	.owner = THIS_MODULE,
602 	.llseek = no_llseek,
603 	.write = hpwdt_write,
604 	.unlocked_ioctl = hpwdt_ioctl,
605 	.open = hpwdt_open,
606 	.release = hpwdt_release,
607 };
608 
609 static struct miscdevice hpwdt_miscdev = {
610 	.minor = WATCHDOG_MINOR,
611 	.name = "watchdog",
612 	.fops = &hpwdt_fops,
613 };
614 
615 static struct notifier_block die_notifier = {
616 	.notifier_call = hpwdt_pretimeout,
617 	.priority = 0x7FFFFFFF,
618 };
619 
620 /*
621  *	Init & Exit
622  */
623 
624 static int __devinit hpwdt_init_one(struct pci_dev *dev,
625 				    const struct pci_device_id *ent)
626 {
627 	int retval;
628 
629 	/*
630 	 * First let's find out if we are on an iLO2 server. We will
631 	 * not run on a legacy ASM box.
632 	 */
633 	if (dev->subsystem_vendor != PCI_VENDOR_ID_HP) {
634 		dev_warn(&dev->dev,
635 		       "This server does not have an iLO2 ASIC.\n");
636 		return -ENODEV;
637 	}
638 
639 	if (pci_enable_device(dev)) {
640 		dev_warn(&dev->dev,
641 			"Not possible to enable PCI Device: 0x%x:0x%x.\n",
642 			ent->vendor, ent->device);
643 		return -ENODEV;
644 	}
645 
646 	pci_mem_addr = pci_iomap(dev, 1, 0x80);
647 	if (!pci_mem_addr) {
648 		dev_warn(&dev->dev,
649 			"Unable to detect the iLO2 server memory.\n");
650 		retval = -ENOMEM;
651 		goto error_pci_iomap;
652 	}
653 	hpwdt_timer_reg = pci_mem_addr + 0x70;
654 	hpwdt_timer_con = pci_mem_addr + 0x72;
655 
656 	/* Make sure that we have a valid soft_margin */
657 	if (hpwdt_change_timer(soft_margin))
658 		hpwdt_change_timer(DEFAULT_MARGIN);
659 
660 	/*
661 	 * We need to map the ROM to get the CRU service.
662 	 * For 32 bit Operating Systems we need to go through the 32 Bit
663 	 * BIOS Service Directory
664 	 * For 64 bit Operating Systems we get that service through SMBIOS.
665 	 */
666 	retval = detect_cru_service();
667 	if (retval < 0) {
668 		dev_warn(&dev->dev,
669 		       "Unable to detect the %d Bit CRU Service.\n",
670 			HPWDT_ARCH);
671 		goto error_get_cru;
672 	}
673 
674 	/*
675 	 * We know this is the only CRU call we need to make so lets keep as
676 	 * few instructions as possible once the NMI comes in.
677 	 */
678 	cmn_regs.u1.rah = 0x0D;
679 	cmn_regs.u1.ral = 0x02;
680 
681 	retval = register_die_notifier(&die_notifier);
682 	if (retval != 0) {
683 		dev_warn(&dev->dev,
684 		       "Unable to register a die notifier (err=%d).\n",
685 			retval);
686 		goto error_die_notifier;
687 	}
688 
689 	retval = misc_register(&hpwdt_miscdev);
690 	if (retval < 0) {
691 		dev_warn(&dev->dev,
692 			"Unable to register miscdev on minor=%d (err=%d).\n",
693 			WATCHDOG_MINOR, retval);
694 		goto error_misc_register;
695 	}
696 
697 	printk(KERN_INFO
698 		"hp Watchdog Timer Driver: 1.00"
699 		", timer margin: %d seconds( nowayout=%d).\n",
700 		soft_margin, nowayout);
701 
702 	return 0;
703 
704 error_misc_register:
705 	unregister_die_notifier(&die_notifier);
706 error_die_notifier:
707 	if (cru_rom_addr)
708 		iounmap(cru_rom_addr);
709 error_get_cru:
710 	pci_iounmap(dev, pci_mem_addr);
711 error_pci_iomap:
712 	pci_disable_device(dev);
713 	return retval;
714 }
715 
716 static void __devexit hpwdt_exit(struct pci_dev *dev)
717 {
718 	if (!nowayout)
719 		hpwdt_stop();
720 
721 	misc_deregister(&hpwdt_miscdev);
722 	unregister_die_notifier(&die_notifier);
723 
724 	if (cru_rom_addr)
725 		iounmap(cru_rom_addr);
726 	pci_iounmap(dev, pci_mem_addr);
727 	pci_disable_device(dev);
728 }
729 
730 static struct pci_driver hpwdt_driver = {
731 	.name = "hpwdt",
732 	.id_table = hpwdt_devices,
733 	.probe = hpwdt_init_one,
734 	.remove = __devexit_p(hpwdt_exit),
735 };
736 
737 static void __exit hpwdt_cleanup(void)
738 {
739 	pci_unregister_driver(&hpwdt_driver);
740 }
741 
742 static int __init hpwdt_init(void)
743 {
744 	return pci_register_driver(&hpwdt_driver);
745 }
746 
747 MODULE_AUTHOR("Tom Mingarelli");
748 MODULE_DESCRIPTION("hp watchdog driver");
749 MODULE_LICENSE("GPL");
750 MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
751 
752 module_param(soft_margin, int, 0);
753 MODULE_PARM_DESC(soft_margin, "Watchdog timeout in seconds");
754 
755 module_param(nowayout, int, 0);
756 MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default="
757 		__MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
758 
759 module_init(hpwdt_init);
760 module_exit(hpwdt_cleanup);
761