blob: eaa3f2a79ff55bebafa7a655092879322d0f7743 [file] [log] [blame]
Thomas Mingarelli7f4da472007-12-04 17:41:54 +00001/*
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
52struct 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
Thomas Mingarelli7f4da472007-12-04 17:41:54 +000061/* type 212 */
62struct 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
73struct 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
116static unsigned int soft_margin = DEFAULT_MARGIN; /* in seconds */
117static unsigned int reload; /* the computed soft_margin */
118static int nowayout = WATCHDOG_NOWAYOUT;
119static char expect_release;
120static unsigned long hpwdt_is_open;
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
Linus Torvalds1f6ef2342008-06-20 12:19:28 -0700143extern asmlinkage void asminline_call(struct cmn_registers *pi86Regs, unsigned long *pRomEntry);
144
Thomas Mingarelli7f4da472007-12-04 17:41:54 +0000145#ifndef CONFIG_X86_64
146/* --32 Bit Bios------------------------------------------------------------ */
147
148#define HPWDT_ARCH 32
149
Linus Torvalds1f6ef2342008-06-20 12:19:28 -0700150asm(".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
Thomas Mingarelli7f4da472007-12-04 17:41:54 +0000190
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/*
Roland Dreier30ec9102008-02-28 12:34:42 -0800257 * 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/*
Thomas Mingarelli7f4da472007-12-04 17:41:54 +0000275 * 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
Linus Torvalds1f6ef2342008-06-20 12:19:28 -0700340asm(".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 "popfq \n\t"
362 "movl %eax, (%r9) \n\t"
363 "movl %ebx, 4(%r9) \n\t"
364 "movl %ecx, 8(%r9) \n\t"
365 "movl %edx, 12(%r9) \n\t"
366 "movl %esi, 16(%r9) \n\t"
367 "movl %edi, 20(%r9) \n\t"
368 "movq %r12, %rax \n\t"
369 "movl %eax, 28(%r9) \n\t"
370 "popq %r9 \n\t"
371 "popq %r12 \n\t"
372 "popq %rdx \n\t"
373 "popq %rbx \n\t"
374 "popq %rax \n\t"
375 "leave \n\t"
376 "ret \n\t"
377 ".previous");
Thomas Mingarelli7f4da472007-12-04 17:41:54 +0000378
379/*
380 * dmi_find_cru
381 *
382 * Routine Description:
Roland Dreier30ec9102008-02-28 12:34:42 -0800383 * This function checks whether or not a SMBIOS/DMI record is
Thomas Mingarelli7f4da472007-12-04 17:41:54 +0000384 * the 64bit CRU info or not
Thomas Mingarelli7f4da472007-12-04 17:41:54 +0000385 */
386static void __devinit dmi_find_cru(const struct dmi_header *dm)
387{
388 struct smbios_cru64_info *smbios_cru64_ptr;
389 unsigned long cru_physical_address;
390
391 if (dm->type == SMBIOS_CRU64_INFORMATION) {
392 smbios_cru64_ptr = (struct smbios_cru64_info *) dm;
393 if (smbios_cru64_ptr->signature == CRU_BIOS_SIGNATURE_VALUE) {
394 cru_physical_address =
395 smbios_cru64_ptr->physical_address +
396 smbios_cru64_ptr->double_offset;
397 cru_rom_addr = ioremap(cru_physical_address,
398 smbios_cru64_ptr->double_length);
399 }
400 }
401}
402
Thomas Mingarelli7f4da472007-12-04 17:41:54 +0000403static int __devinit detect_cru_service(void)
404{
405 cru_rom_addr = NULL;
406
Roland Dreier30ec9102008-02-28 12:34:42 -0800407 dmi_walk(dmi_find_cru);
Thomas Mingarelli7f4da472007-12-04 17:41:54 +0000408
409 /* if cru_rom_addr has been set then we found a CRU service */
410 return ((cru_rom_addr != NULL)? 0: -ENODEV);
411}
412
413/* ------------------------------------------------------------------------- */
414
415#endif
416
417/*
418 * NMI Handler
419 */
420static int hpwdt_pretimeout(struct notifier_block *nb, unsigned long ulReason,
421 void *data)
422{
423 static unsigned long rom_pl;
424 static int die_nmi_called;
425
Wim Van Sebroeckfdf7be62008-06-18 16:22:48 +0000426 if (ulReason != DIE_NMI && ulReason != DIE_NMI_IPI)
427 return NOTIFY_OK;
428
429 spin_lock_irqsave(&rom_lock, rom_pl);
430 if (!die_nmi_called)
431 asminline_call(&cmn_regs, cru_rom_addr);
432 die_nmi_called = 1;
433 spin_unlock_irqrestore(&rom_lock, rom_pl);
434 if (cmn_regs.u1.ral == 0) {
435 printk(KERN_WARNING "hpwdt: An NMI occurred, "
436 "but unable to determine source.\n");
437 } else {
438 panic("An NMI occurred, please see the Integrated "
439 "Management Log for details.\n");
Thomas Mingarelli7f4da472007-12-04 17:41:54 +0000440 }
441
Wim Van Sebroeckfdf7be62008-06-18 16:22:48 +0000442 return NOTIFY_STOP;
Thomas Mingarelli7f4da472007-12-04 17:41:54 +0000443}
444
445/*
446 * Watchdog operations
447 */
448static void hpwdt_start(void)
449{
450 reload = (soft_margin * 1000) / 128;
451 iowrite16(reload, hpwdt_timer_reg);
452 iowrite16(0x85, hpwdt_timer_con);
453}
454
455static void hpwdt_stop(void)
456{
457 unsigned long data;
458
459 data = ioread16(hpwdt_timer_con);
460 data &= 0xFE;
461 iowrite16(data, hpwdt_timer_con);
462}
463
464static void hpwdt_ping(void)
465{
466 iowrite16(reload, hpwdt_timer_reg);
467}
468
469static int hpwdt_change_timer(int new_margin)
470{
471 /* Arbitrary, can't find the card's limits */
472 if (new_margin < 30 || new_margin > 600) {
473 printk(KERN_WARNING
474 "hpwdt: New value passed in is invalid: %d seconds.\n",
475 new_margin);
476 return -EINVAL;
477 }
478
479 soft_margin = new_margin;
480 printk(KERN_DEBUG
481 "hpwdt: New timer passed in is %d seconds.\n",
482 new_margin);
483 reload = (soft_margin * 1000) / 128;
484
485 return 0;
486}
487
488/*
489 * /dev/watchdog handling
490 */
491static 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
504static 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
523static 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
552static struct watchdog_info ident = {
553 .options = WDIOF_SETTIMEOUT |
554 WDIOF_KEEPALIVEPING |
555 WDIOF_MAGICCLOSE,
556 .identity = "HP iLO2 HW Watchdog Timer",
557};
558
559static 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 */
605static 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
614static struct miscdevice hpwdt_miscdev = {
615 .minor = WATCHDOG_MINOR,
616 .name = "watchdog",
617 .fops = &hpwdt_fops,
618};
619
620static struct notifier_block die_notifier = {
621 .notifier_call = hpwdt_pretimeout,
622 .priority = 0x7FFFFFFF,
623};
624
625/*
626 * Init & Exit
627 */
628
629static 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 */
638 if (dev->subsystem_vendor != PCI_VENDOR_ID_HP) {
639 dev_warn(&dev->dev,
640 "This server does not have an iLO2 ASIC.\n");
641 return -ENODEV;
642 }
643
644 if (pci_enable_device(dev)) {
645 dev_warn(&dev->dev,
646 "Not possible to enable PCI Device: 0x%x:0x%x.\n",
647 ent->vendor, ent->device);
648 return -ENODEV;
649 }
650
651 pci_mem_addr = pci_iomap(dev, 1, 0x80);
652 if (!pci_mem_addr) {
653 dev_warn(&dev->dev,
654 "Unable to detect the iLO2 server memory.\n");
655 retval = -ENOMEM;
656 goto error_pci_iomap;
657 }
658 hpwdt_timer_reg = pci_mem_addr + 0x70;
659 hpwdt_timer_con = pci_mem_addr + 0x72;
660
661 /* Make sure that we have a valid soft_margin */
662 if (hpwdt_change_timer(soft_margin))
663 hpwdt_change_timer(DEFAULT_MARGIN);
664
665 /*
666 * We need to map the ROM to get the CRU service.
667 * For 32 bit Operating Systems we need to go through the 32 Bit
668 * BIOS Service Directory
669 * For 64 bit Operating Systems we get that service through SMBIOS.
670 */
671 retval = detect_cru_service();
672 if (retval < 0) {
673 dev_warn(&dev->dev,
674 "Unable to detect the %d Bit CRU Service.\n",
675 HPWDT_ARCH);
676 goto error_get_cru;
677 }
678
679 /*
680 * We know this is the only CRU call we need to make so lets keep as
681 * few instructions as possible once the NMI comes in.
682 */
683 cmn_regs.u1.rah = 0x0D;
684 cmn_regs.u1.ral = 0x02;
685
686 retval = register_die_notifier(&die_notifier);
687 if (retval != 0) {
688 dev_warn(&dev->dev,
689 "Unable to register a die notifier (err=%d).\n",
690 retval);
691 goto error_die_notifier;
692 }
693
694 retval = misc_register(&hpwdt_miscdev);
695 if (retval < 0) {
696 dev_warn(&dev->dev,
697 "Unable to register miscdev on minor=%d (err=%d).\n",
698 WATCHDOG_MINOR, retval);
699 goto error_misc_register;
700 }
701
702 printk(KERN_INFO
703 "hp Watchdog Timer Driver: 1.00"
704 ", timer margin: %d seconds( nowayout=%d).\n",
705 soft_margin, nowayout);
706
707 return 0;
708
709error_misc_register:
710 unregister_die_notifier(&die_notifier);
711error_die_notifier:
712 if (cru_rom_addr)
713 iounmap(cru_rom_addr);
714error_get_cru:
715 pci_iounmap(dev, pci_mem_addr);
716error_pci_iomap:
717 pci_disable_device(dev);
718 return retval;
719}
720
721static void __devexit hpwdt_exit(struct pci_dev *dev)
722{
723 if (!nowayout)
724 hpwdt_stop();
725
726 misc_deregister(&hpwdt_miscdev);
727 unregister_die_notifier(&die_notifier);
728
729 if (cru_rom_addr)
730 iounmap(cru_rom_addr);
731 pci_iounmap(dev, pci_mem_addr);
732 pci_disable_device(dev);
733}
734
735static struct pci_driver hpwdt_driver = {
736 .name = "hpwdt",
737 .id_table = hpwdt_devices,
738 .probe = hpwdt_init_one,
739 .remove = __devexit_p(hpwdt_exit),
740};
741
742static void __exit hpwdt_cleanup(void)
743{
744 pci_unregister_driver(&hpwdt_driver);
745}
746
747static int __init hpwdt_init(void)
748{
749 return pci_register_driver(&hpwdt_driver);
750}
751
752MODULE_AUTHOR("Tom Mingarelli");
753MODULE_DESCRIPTION("hp watchdog driver");
754MODULE_LICENSE("GPL");
755MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
756
757module_param(soft_margin, int, 0);
758MODULE_PARM_DESC(soft_margin, "Watchdog timeout in seconds");
759
760module_param(nowayout, int, 0);
761MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default="
762 __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
763
764module_init(hpwdt_init);
765module_exit(hpwdt_cleanup);