blob: a3765e0be4a82db9bedd1adb9175cc7cef6b08d3 [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>
Thomas Mingarelli7f4da472007-12-04 17:41:54 +000042#include <asm/desc.h>
Thomas Mingarelli7f4da472007-12-04 17:41:54 +000043
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
50struct 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
Thomas Mingarelli7f4da472007-12-04 17:41:54 +000059/* type 212 */
60struct 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
71struct 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
114static unsigned int soft_margin = DEFAULT_MARGIN; /* in seconds */
115static unsigned int reload; /* the computed soft_margin */
116static int nowayout = WATCHDOG_NOWAYOUT;
117static char expect_release;
118static unsigned long hpwdt_is_open;
Thomas Mingarelliab4ba3c2008-07-15 19:40:41 +0000119static unsigned int allow_kdump;
Thomas Mingarelli7f4da472007-12-04 17:41:54 +0000120
121static void __iomem *pci_mem_addr; /* the PCI-memory address */
122static unsigned long __iomem *hpwdt_timer_reg;
123static unsigned long __iomem *hpwdt_timer_con;
124
125static DEFINE_SPINLOCK(rom_lock);
126
127static void *cru_rom_addr;
128
129static struct cmn_registers cmn_regs;
130
131static 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};
140MODULE_DEVICE_TABLE(pci, hpwdt_devices);
141
Linus Torvalds1f6ef232008-06-20 12:19:28 -0700142extern asmlinkage void asminline_call(struct cmn_registers *pi86Regs, unsigned long *pRomEntry);
143
Thomas Mingarelli7f4da472007-12-04 17:41:54 +0000144#ifndef CONFIG_X86_64
145/* --32 Bit Bios------------------------------------------------------------ */
146
147#define HPWDT_ARCH 32
148
Linus Torvalds1f6ef232008-06-20 12:19:28 -0700149asm(".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
Thomas Mingarelli7f4da472007-12-04 17:41:54 +0000189
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 */
201static 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
Thomas Mingarelliab4ba3c2008-07-15 19:40:41 +0000225 "hpwdt: Call succeeded but with an error: 0x%x\n",
226 cmn_regs.u1.ral);
Thomas Mingarelli7f4da472007-12-04 17:41:54 +0000227 } 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 =
Thomas Mingarelliab4ba3c2008-07-15 19:40:41 +0000232 physical_bios_base + physical_bios_offset;
Thomas Mingarelli7f4da472007-12-04 17:41:54 +0000233
234 /* If the values look OK, then map it in. */
235 if ((physical_bios_base + physical_bios_offset)) {
236 cru_rom_addr =
Thomas Mingarelliab4ba3c2008-07-15 19:40:41 +0000237 ioremap(cru_physical_address, cru_length);
Thomas Mingarelli7f4da472007-12-04 17:41:54 +0000238 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/*
Roland Dreier30ec9102008-02-28 12:34:42 -0800256 * bios_checksum
257 */
258static 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/*
Thomas Mingarelli7f4da472007-12-04 17:41:54 +0000274 * 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 */
283static 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
313static 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
Linus Torvalds1f6ef232008-06-20 12:19:28 -0700339asm(".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"
Linus Torvalds1f6ef232008-06-20 12:19:28 -0700360 "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");
Thomas Mingarelli7f4da472007-12-04 17:41:54 +0000376
377/*
378 * dmi_find_cru
379 *
380 * Routine Description:
Roland Dreier30ec9102008-02-28 12:34:42 -0800381 * This function checks whether or not a SMBIOS/DMI record is
Thomas Mingarelli7f4da472007-12-04 17:41:54 +0000382 * the 64bit CRU info or not
Thomas Mingarelli7f4da472007-12-04 17:41:54 +0000383 */
384static 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 =
Thomas Mingarelliab4ba3c2008-07-15 19:40:41 +0000393 smbios_cru64_ptr->physical_address +
394 smbios_cru64_ptr->double_offset;
Thomas Mingarelli7f4da472007-12-04 17:41:54 +0000395 cru_rom_addr = ioremap(cru_physical_address,
Thomas Mingarelliab4ba3c2008-07-15 19:40:41 +0000396 smbios_cru64_ptr->double_length);
Thomas Mingarelli7f4da472007-12-04 17:41:54 +0000397 }
398 }
399}
400
Thomas Mingarelli7f4da472007-12-04 17:41:54 +0000401static int __devinit detect_cru_service(void)
402{
403 cru_rom_addr = NULL;
404
Roland Dreier30ec9102008-02-28 12:34:42 -0800405 dmi_walk(dmi_find_cru);
Thomas Mingarelli7f4da472007-12-04 17:41:54 +0000406
407 /* if cru_rom_addr has been set then we found a CRU service */
Thomas Mingarelliab4ba3c2008-07-15 19:40:41 +0000408 return ((cru_rom_addr != NULL) ? 0 : -ENODEV);
Thomas Mingarelli7f4da472007-12-04 17:41:54 +0000409}
410
411/* ------------------------------------------------------------------------- */
412
413#endif
414
415/*
Thomas Mingarelli7f4da472007-12-04 17:41:54 +0000416 * Watchdog operations
417 */
418static 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
425static 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
434static void hpwdt_ping(void)
435{
436 iowrite16(reload, hpwdt_timer_reg);
437}
438
439static 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/*
Thomas Mingarelliab4ba3c2008-07-15 19:40:41 +0000459 * NMI Handler
460 */
461static 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/*
Thomas Mingarelli7f4da472007-12-04 17:41:54 +0000489 * /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;
Wim Van Sebroeck7944d3a2008-08-06 20:19:41 +0000538 if (get_user(c, data + i))
Thomas Mingarelli7f4da472007-12-04 17:41:54 +0000539 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,
Thomas Mingarelliab4ba3c2008-07-15 19:40:41 +0000630 const struct pci_device_id *ent)
Thomas Mingarelli7f4da472007-12-04 17:41:54 +0000631{
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.
Thomas Mingarelliab4ba3c2008-07-15 19:40:41 +0000637 * So we only support the G5 ProLiant servers and higher.
Thomas Mingarelli7f4da472007-12-04 17:41:54 +0000638 */
639 if (dev->subsystem_vendor != PCI_VENDOR_ID_HP) {
640 dev_warn(&dev->dev,
Thomas Mingarelliab4ba3c2008-07-15 19:40:41 +0000641 "This server does not have an iLO2 ASIC.\n");
Thomas Mingarelli7f4da472007-12-04 17:41:54 +0000642 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,
Thomas Mingarelliab4ba3c2008-07-15 19:40:41 +0000675 "Unable to detect the %d Bit CRU Service.\n",
Thomas Mingarelli7f4da472007-12-04 17:41:54 +0000676 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,
Thomas Mingarelliab4ba3c2008-07-15 19:40:41 +0000690 "Unable to register a die notifier (err=%d).\n",
Thomas Mingarelli7f4da472007-12-04 17:41:54 +0000691 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"
Thomas Mingarelliab4ba3c2008-07-15 19:40:41 +0000705 ", timer margin: %d seconds (nowayout=%d)"
706 ", allow kernel dump: %s (default = 0/OFF).\n",
707 soft_margin, nowayout, (allow_kdump == 0) ? "OFF" : "ON");
Thomas Mingarelli7f4da472007-12-04 17:41:54 +0000708
709 return 0;
710
711error_misc_register:
712 unregister_die_notifier(&die_notifier);
713error_die_notifier:
714 if (cru_rom_addr)
715 iounmap(cru_rom_addr);
716error_get_cru:
717 pci_iounmap(dev, pci_mem_addr);
718error_pci_iomap:
719 pci_disable_device(dev);
720 return retval;
721}
722
723static 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
737static 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
744static void __exit hpwdt_cleanup(void)
745{
746 pci_unregister_driver(&hpwdt_driver);
747}
748
749static int __init hpwdt_init(void)
750{
751 return pci_register_driver(&hpwdt_driver);
752}
753
754MODULE_AUTHOR("Tom Mingarelli");
755MODULE_DESCRIPTION("hp watchdog driver");
756MODULE_LICENSE("GPL");
757MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
758
759module_param(soft_margin, int, 0);
760MODULE_PARM_DESC(soft_margin, "Watchdog timeout in seconds");
761
Thomas Mingarelliab4ba3c2008-07-15 19:40:41 +0000762module_param(allow_kdump, int, 0);
763MODULE_PARM_DESC(allow_kdump, "Start a kernel dump after NMI occurs");
764
Thomas Mingarelli7f4da472007-12-04 17:41:54 +0000765module_param(nowayout, int, 0);
766MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default="
767 __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
768
769module_init(hpwdt_init);
770module_exit(hpwdt_cleanup);