Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc-2.6
[linux-2.6.git] / drivers / watchdog / hpwdt.c
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/nmi.h>
23 #include <linux/kernel.h>
24 #include <linux/miscdevice.h>
25 #include <linux/mm.h>
26 #include <linux/module.h>
27 #include <linux/kdebug.h>
28 #include <linux/moduleparam.h>
29 #include <linux/notifier.h>
30 #include <linux/pci.h>
31 #include <linux/pci_ids.h>
32 #include <linux/reboot.h>
33 #include <linux/sched.h>
34 #include <linux/timer.h>
35 #include <linux/types.h>
36 #include <linux/uaccess.h>
37 #include <linux/watchdog.h>
38 #include <linux/dmi.h>
39 #include <linux/efi.h>
40 #include <linux/string.h>
41 #include <linux/bootmem.h>
42 #include <linux/slab.h>
43 #include <asm/desc.h>
44 #include <asm/cacheflush.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 #define HPWDT_VERSION                   "1.1.1"
52
53 struct bios32_service_dir {
54         u32 signature;
55         u32 entry_point;
56         u8 revision;
57         u8 length;
58         u8 checksum;
59         u8 reserved[5];
60 };
61
62 /* type 212 */
63 struct smbios_cru64_info {
64         u8 type;
65         u8 byte_length;
66         u16 handle;
67         u32 signature;
68         u64 physical_address;
69         u32 double_length;
70         u32 double_offset;
71 };
72 #define SMBIOS_CRU64_INFORMATION        212
73
74 struct cmn_registers {
75         union {
76                 struct {
77                         u8 ral;
78                         u8 rah;
79                         u16 rea2;
80                 };
81                 u32 reax;
82         } u1;
83         union {
84                 struct {
85                         u8 rbl;
86                         u8 rbh;
87                         u8 reb2l;
88                         u8 reb2h;
89                 };
90                 u32 rebx;
91         } u2;
92         union {
93                 struct {
94                         u8 rcl;
95                         u8 rch;
96                         u16 rec2;
97                 };
98                 u32 recx;
99         } u3;
100         union {
101                 struct {
102                         u8 rdl;
103                         u8 rdh;
104                         u16 red2;
105                 };
106                 u32 redx;
107         } u4;
108
109         u32 resi;
110         u32 redi;
111         u16 rds;
112         u16 res;
113         u32 reflags;
114 }  __attribute__((packed));
115
116 #define DEFAULT_MARGIN  30
117 static unsigned int soft_margin = DEFAULT_MARGIN;       /* in seconds */
118 static unsigned int reload;                     /* the computed soft_margin */
119 static int nowayout = WATCHDOG_NOWAYOUT;
120 static char expect_release;
121 static unsigned long hpwdt_is_open;
122 static unsigned int allow_kdump;
123 static unsigned int hpwdt_nmi_sourcing;
124 static unsigned int priority;           /* hpwdt at end of die_notify list */
125
126 static void __iomem *pci_mem_addr;              /* the PCI-memory address */
127 static unsigned long __iomem *hpwdt_timer_reg;
128 static unsigned long __iomem *hpwdt_timer_con;
129
130 static DEFINE_SPINLOCK(rom_lock);
131
132 static void *cru_rom_addr;
133
134 static struct cmn_registers cmn_regs;
135
136 static struct pci_device_id hpwdt_devices[] = {
137         { PCI_DEVICE(PCI_VENDOR_ID_COMPAQ, 0xB203) },
138         { PCI_DEVICE(PCI_VENDOR_ID_HP, 0x3306) },
139         {0},                    /* terminate list */
140 };
141 MODULE_DEVICE_TABLE(pci, hpwdt_devices);
142
143 extern asmlinkage void asminline_call(struct cmn_registers *pi86Regs,
144                                                 unsigned long *pRomEntry);
145
146 #ifndef CONFIG_X86_64
147 /* --32 Bit Bios------------------------------------------------------------ */
148
149 #define HPWDT_ARCH      32
150
151 asm(".text                          \n\t"
152     ".align 4                       \n"
153     "asminline_call:                \n\t"
154     "pushl       %ebp               \n\t"
155     "movl        %esp, %ebp         \n\t"
156     "pusha                          \n\t"
157     "pushf                          \n\t"
158     "push        %es                \n\t"
159     "push        %ds                \n\t"
160     "pop         %es                \n\t"
161     "movl        8(%ebp),%eax       \n\t"
162     "movl        4(%eax),%ebx       \n\t"
163     "movl        8(%eax),%ecx       \n\t"
164     "movl        12(%eax),%edx      \n\t"
165     "movl        16(%eax),%esi      \n\t"
166     "movl        20(%eax),%edi      \n\t"
167     "movl        (%eax),%eax        \n\t"
168     "push        %cs                \n\t"
169     "call        *12(%ebp)          \n\t"
170     "pushf                          \n\t"
171     "pushl       %eax               \n\t"
172     "movl        8(%ebp),%eax       \n\t"
173     "movl        %ebx,4(%eax)       \n\t"
174     "movl        %ecx,8(%eax)       \n\t"
175     "movl        %edx,12(%eax)      \n\t"
176     "movl        %esi,16(%eax)      \n\t"
177     "movl        %edi,20(%eax)      \n\t"
178     "movw        %ds,24(%eax)       \n\t"
179     "movw        %es,26(%eax)       \n\t"
180     "popl        %ebx               \n\t"
181     "movl        %ebx,(%eax)        \n\t"
182     "popl        %ebx               \n\t"
183     "movl        %ebx,28(%eax)      \n\t"
184     "pop         %es                \n\t"
185     "popf                           \n\t"
186     "popa                           \n\t"
187     "leave                          \n\t"
188     "ret                            \n\t"
189     ".previous");
190
191
192 /*
193  *      cru_detect
194  *
195  *      Routine Description:
196  *      This function uses the 32-bit BIOS Service Directory record to
197  *      search for a $CRU record.
198  *
199  *      Return Value:
200  *      0        :  SUCCESS
201  *      <0       :  FAILURE
202  */
203 static int __devinit cru_detect(unsigned long map_entry,
204         unsigned long map_offset)
205 {
206         void *bios32_map;
207         unsigned long *bios32_entrypoint;
208         unsigned long cru_physical_address;
209         unsigned long cru_length;
210         unsigned long physical_bios_base = 0;
211         unsigned long physical_bios_offset = 0;
212         int retval = -ENODEV;
213
214         bios32_map = ioremap(map_entry, (2 * PAGE_SIZE));
215
216         if (bios32_map == NULL)
217                 return -ENODEV;
218
219         bios32_entrypoint = bios32_map + map_offset;
220
221         cmn_regs.u1.reax = CRU_BIOS_SIGNATURE_VALUE;
222
223         asminline_call(&cmn_regs, bios32_entrypoint);
224
225         if (cmn_regs.u1.ral != 0) {
226                 printk(KERN_WARNING
227                         "hpwdt: Call succeeded but with an error: 0x%x\n",
228                         cmn_regs.u1.ral);
229         } else {
230                 physical_bios_base = cmn_regs.u2.rebx;
231                 physical_bios_offset = cmn_regs.u4.redx;
232                 cru_length = cmn_regs.u3.recx;
233                 cru_physical_address =
234                         physical_bios_base + physical_bios_offset;
235
236                 /* If the values look OK, then map it in. */
237                 if ((physical_bios_base + physical_bios_offset)) {
238                         cru_rom_addr =
239                                 ioremap(cru_physical_address, cru_length);
240                         if (cru_rom_addr)
241                                 retval = 0;
242                 }
243
244                 printk(KERN_DEBUG "hpwdt: CRU Base Address:   0x%lx\n",
245                         physical_bios_base);
246                 printk(KERN_DEBUG "hpwdt: CRU Offset Address: 0x%lx\n",
247                         physical_bios_offset);
248                 printk(KERN_DEBUG "hpwdt: CRU Length:         0x%lx\n",
249                         cru_length);
250                 printk(KERN_DEBUG "hpwdt: CRU Mapped Address: 0x%x\n",
251                         (unsigned int)&cru_rom_addr);
252         }
253         iounmap(bios32_map);
254         return retval;
255 }
256
257 /*
258  *      bios_checksum
259  */
260 static int __devinit bios_checksum(const char __iomem *ptr, int len)
261 {
262         char sum = 0;
263         int i;
264
265         /*
266          * calculate checksum of size bytes. This should add up
267          * to zero if we have a valid header.
268          */
269         for (i = 0; i < len; i++)
270                 sum += ptr[i];
271
272         return ((sum == 0) && (len > 0));
273 }
274
275 /*
276  *      bios32_present
277  *
278  *      Routine Description:
279  *      This function finds the 32-bit BIOS Service Directory
280  *
281  *      Return Value:
282  *      0        :  SUCCESS
283  *      <0       :  FAILURE
284  */
285 static int __devinit bios32_present(const char __iomem *p)
286 {
287         struct bios32_service_dir *bios_32_ptr;
288         int length;
289         unsigned long map_entry, map_offset;
290
291         bios_32_ptr = (struct bios32_service_dir *) p;
292
293         /*
294          * Search for signature by checking equal to the swizzled value
295          * instead of calling another routine to perform a strcmp.
296          */
297         if (bios_32_ptr->signature == PCI_BIOS32_SD_VALUE) {
298                 length = bios_32_ptr->length * PCI_BIOS32_PARAGRAPH_LEN;
299                 if (bios_checksum(p, length)) {
300                         /*
301                          * According to the spec, we're looking for the
302                          * first 4KB-aligned address below the entrypoint
303                          * listed in the header. The Service Directory code
304                          * is guaranteed to occupy no more than 2 4KB pages.
305                          */
306                         map_entry = bios_32_ptr->entry_point & ~(PAGE_SIZE - 1);
307                         map_offset = bios_32_ptr->entry_point - map_entry;
308
309                         return cru_detect(map_entry, map_offset);
310                 }
311         }
312         return -ENODEV;
313 }
314
315 static int __devinit detect_cru_service(void)
316 {
317         char __iomem *p, *q;
318         int rc = -1;
319
320         /*
321          * Search from 0x0f0000 through 0x0fffff, inclusive.
322          */
323         p = ioremap(PCI_ROM_BASE1, ROM_SIZE);
324         if (p == NULL)
325                 return -ENOMEM;
326
327         for (q = p; q < p + ROM_SIZE; q += 16) {
328                 rc = bios32_present(q);
329                 if (!rc)
330                         break;
331         }
332         iounmap(p);
333         return rc;
334 }
335
336 #else
337 /* --64 Bit Bios------------------------------------------------------------ */
338
339 #define HPWDT_ARCH      64
340
341 asm(".text                      \n\t"
342     ".align 4                   \n"
343     "asminline_call:            \n\t"
344     "pushq      %rbp            \n\t"
345     "movq       %rsp, %rbp      \n\t"
346     "pushq      %rax            \n\t"
347     "pushq      %rbx            \n\t"
348     "pushq      %rdx            \n\t"
349     "pushq      %r12            \n\t"
350     "pushq      %r9             \n\t"
351     "movq       %rsi, %r12      \n\t"
352     "movq       %rdi, %r9       \n\t"
353     "movl       4(%r9),%ebx     \n\t"
354     "movl       8(%r9),%ecx     \n\t"
355     "movl       12(%r9),%edx    \n\t"
356     "movl       16(%r9),%esi    \n\t"
357     "movl       20(%r9),%edi    \n\t"
358     "movl       (%r9),%eax      \n\t"
359     "call       *%r12           \n\t"
360     "pushfq                     \n\t"
361     "popq        %r12           \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");
378
379 /*
380  *      dmi_find_cru
381  *
382  *      Routine Description:
383  *      This function checks whether or not a SMBIOS/DMI record is
384  *      the 64bit CRU info or not
385  */
386 static void __devinit dmi_find_cru(const struct dmi_header *dm, void *dummy)
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                         set_memory_x((unsigned long)cru_rom_addr & PAGE_MASK,
400                                 smbios_cru64_ptr->double_length >> PAGE_SHIFT);
401                 }
402         }
403 }
404
405 static int __devinit detect_cru_service(void)
406 {
407         cru_rom_addr = NULL;
408
409         dmi_walk(dmi_find_cru, NULL);
410
411         /* if cru_rom_addr has been set then we found a CRU service */
412         return ((cru_rom_addr != NULL) ? 0 : -ENODEV);
413 }
414
415 /* ------------------------------------------------------------------------- */
416
417 #endif
418
419 /*
420  *      Watchdog operations
421  */
422 static void hpwdt_start(void)
423 {
424         reload = (soft_margin * 1000) / 128;
425         iowrite16(reload, hpwdt_timer_reg);
426         iowrite16(0x85, hpwdt_timer_con);
427 }
428
429 static void hpwdt_stop(void)
430 {
431         unsigned long data;
432
433         data = ioread16(hpwdt_timer_con);
434         data &= 0xFE;
435         iowrite16(data, hpwdt_timer_con);
436 }
437
438 static void hpwdt_ping(void)
439 {
440         iowrite16(reload, hpwdt_timer_reg);
441 }
442
443 static int hpwdt_change_timer(int new_margin)
444 {
445         /* Arbitrary, can't find the card's limits */
446         if (new_margin < 30 || new_margin > 600) {
447                 printk(KERN_WARNING
448                         "hpwdt: New value passed in is invalid: %d seconds.\n",
449                         new_margin);
450                 return -EINVAL;
451         }
452
453         soft_margin = new_margin;
454         printk(KERN_DEBUG
455                 "hpwdt: New timer passed in is %d seconds.\n",
456                 new_margin);
457         reload = (soft_margin * 1000) / 128;
458
459         return 0;
460 }
461
462 /*
463  *      NMI Handler
464  */
465 static int hpwdt_pretimeout(struct notifier_block *nb, unsigned long ulReason,
466                                 void *data)
467 {
468         unsigned long rom_pl;
469         static int die_nmi_called;
470
471         if (ulReason != DIE_NMI && ulReason != DIE_NMI_IPI)
472                 return NOTIFY_OK;
473
474         if (hpwdt_nmi_sourcing) {
475                 spin_lock_irqsave(&rom_lock, rom_pl);
476                 if (!die_nmi_called)
477                         asminline_call(&cmn_regs, cru_rom_addr);
478                 die_nmi_called = 1;
479                 spin_unlock_irqrestore(&rom_lock, rom_pl);
480                 if (cmn_regs.u1.ral == 0) {
481                         printk(KERN_WARNING "hpwdt: An NMI occurred, "
482                                 "but unable to determine source.\n");
483                 } else {
484                         if (allow_kdump)
485                                 hpwdt_stop();
486                         panic("An NMI occurred, please see the Integrated "
487                                 "Management Log for details.\n");
488                 }
489         }
490         return NOTIFY_OK;
491 }
492
493 /*
494  *      /dev/watchdog handling
495  */
496 static int hpwdt_open(struct inode *inode, struct file *file)
497 {
498         /* /dev/watchdog can only be opened once */
499         if (test_and_set_bit(0, &hpwdt_is_open))
500                 return -EBUSY;
501
502         /* Start the watchdog */
503         hpwdt_start();
504         hpwdt_ping();
505
506         return nonseekable_open(inode, file);
507 }
508
509 static int hpwdt_release(struct inode *inode, struct file *file)
510 {
511         /* Stop the watchdog */
512         if (expect_release == 42) {
513                 hpwdt_stop();
514         } else {
515                 printk(KERN_CRIT
516                         "hpwdt: Unexpected close, not stopping watchdog!\n");
517                 hpwdt_ping();
518         }
519
520         expect_release = 0;
521
522         /* /dev/watchdog is being closed, make sure it can be re-opened */
523         clear_bit(0, &hpwdt_is_open);
524
525         return 0;
526 }
527
528 static ssize_t hpwdt_write(struct file *file, const char __user *data,
529         size_t len, loff_t *ppos)
530 {
531         /* See if we got the magic character 'V' and reload the timer */
532         if (len) {
533                 if (!nowayout) {
534                         size_t i;
535
536                         /* note: just in case someone wrote the magic character
537                          * five months ago... */
538                         expect_release = 0;
539
540                         /* scan to see whether or not we got the magic char. */
541                         for (i = 0; i != len; i++) {
542                                 char c;
543                                 if (get_user(c, data + i))
544                                         return -EFAULT;
545                                 if (c == 'V')
546                                         expect_release = 42;
547                         }
548                 }
549
550                 /* someone wrote to us, we should reload the timer */
551                 hpwdt_ping();
552         }
553
554         return len;
555 }
556
557 static const struct watchdog_info ident = {
558         .options = WDIOF_SETTIMEOUT |
559                    WDIOF_KEEPALIVEPING |
560                    WDIOF_MAGICCLOSE,
561         .identity = "HP iLO2 HW Watchdog Timer",
562 };
563
564 static long hpwdt_ioctl(struct file *file, unsigned int cmd,
565         unsigned long arg)
566 {
567         void __user *argp = (void __user *)arg;
568         int __user *p = argp;
569         int new_margin;
570         int ret = -ENOTTY;
571
572         switch (cmd) {
573         case WDIOC_GETSUPPORT:
574                 ret = 0;
575                 if (copy_to_user(argp, &ident, sizeof(ident)))
576                         ret = -EFAULT;
577                 break;
578
579         case WDIOC_GETSTATUS:
580         case WDIOC_GETBOOTSTATUS:
581                 ret = put_user(0, p);
582                 break;
583
584         case WDIOC_KEEPALIVE:
585                 hpwdt_ping();
586                 ret = 0;
587                 break;
588
589         case WDIOC_SETTIMEOUT:
590                 ret = get_user(new_margin, p);
591                 if (ret)
592                         break;
593
594                 ret = hpwdt_change_timer(new_margin);
595                 if (ret)
596                         break;
597
598                 hpwdt_ping();
599                 /* Fall */
600         case WDIOC_GETTIMEOUT:
601                 ret = put_user(soft_margin, p);
602                 break;
603         }
604         return ret;
605 }
606
607 /*
608  *      Kernel interfaces
609  */
610 static const struct file_operations hpwdt_fops = {
611         .owner = THIS_MODULE,
612         .llseek = no_llseek,
613         .write = hpwdt_write,
614         .unlocked_ioctl = hpwdt_ioctl,
615         .open = hpwdt_open,
616         .release = hpwdt_release,
617 };
618
619 static struct miscdevice hpwdt_miscdev = {
620         .minor = WATCHDOG_MINOR,
621         .name = "watchdog",
622         .fops = &hpwdt_fops,
623 };
624
625 static struct notifier_block die_notifier = {
626         .notifier_call = hpwdt_pretimeout,
627         .priority = 0,
628 };
629
630 /*
631  *      Init & Exit
632  */
633
634 #ifdef ARCH_HAS_NMI_WATCHDOG
635 static void __devinit hpwdt_check_nmi_sourcing(struct pci_dev *dev)
636 {
637         /*
638          * If nmi_watchdog is turned off then we can turn on
639          * our nmi sourcing capability.
640          */
641         if (!nmi_watchdog_active())
642                 hpwdt_nmi_sourcing = 1;
643         else
644                 dev_warn(&dev->dev, "NMI sourcing is disabled. To enable this "
645                         "functionality you must reboot with nmi_watchdog=0 "
646                         "and load the hpwdt driver with priority=1.\n");
647 }
648 #else
649 static void __devinit hpwdt_check_nmi_sourcing(struct pci_dev *dev)
650 {
651         dev_warn(&dev->dev, "NMI sourcing is disabled. "
652                 "Your kernel does not support a NMI Watchdog.\n");
653 }
654 #endif
655
656 static int __devinit hpwdt_init_one(struct pci_dev *dev,
657                                         const struct pci_device_id *ent)
658 {
659         int retval;
660
661         /*
662          * Check if we can do NMI sourcing or not
663          */
664         hpwdt_check_nmi_sourcing(dev);
665
666         /*
667          * First let's find out if we are on an iLO2 server. We will
668          * not run on a legacy ASM box.
669          * So we only support the G5 ProLiant servers and higher.
670          */
671         if (dev->subsystem_vendor != PCI_VENDOR_ID_HP) {
672                 dev_warn(&dev->dev,
673                         "This server does not have an iLO2 ASIC.\n");
674                 return -ENODEV;
675         }
676
677         if (pci_enable_device(dev)) {
678                 dev_warn(&dev->dev,
679                         "Not possible to enable PCI Device: 0x%x:0x%x.\n",
680                         ent->vendor, ent->device);
681                 return -ENODEV;
682         }
683
684         pci_mem_addr = pci_iomap(dev, 1, 0x80);
685         if (!pci_mem_addr) {
686                 dev_warn(&dev->dev,
687                         "Unable to detect the iLO2 server memory.\n");
688                 retval = -ENOMEM;
689                 goto error_pci_iomap;
690         }
691         hpwdt_timer_reg = pci_mem_addr + 0x70;
692         hpwdt_timer_con = pci_mem_addr + 0x72;
693
694         /* Make sure that we have a valid soft_margin */
695         if (hpwdt_change_timer(soft_margin))
696                 hpwdt_change_timer(DEFAULT_MARGIN);
697
698         /*
699          * We need to map the ROM to get the CRU service.
700          * For 32 bit Operating Systems we need to go through the 32 Bit
701          * BIOS Service Directory
702          * For 64 bit Operating Systems we get that service through SMBIOS.
703          */
704         retval = detect_cru_service();
705         if (retval < 0) {
706                 dev_warn(&dev->dev,
707                         "Unable to detect the %d Bit CRU Service.\n",
708                         HPWDT_ARCH);
709                 goto error_get_cru;
710         }
711
712         /*
713          * We know this is the only CRU call we need to make so lets keep as
714          * few instructions as possible once the NMI comes in.
715          */
716         cmn_regs.u1.rah = 0x0D;
717         cmn_regs.u1.ral = 0x02;
718
719         /*
720          * If the priority is set to 1, then we will be put first on the
721          * die notify list to handle a critical NMI. The default is to
722          * be last so other users of the NMI signal can function.
723          */
724         if (priority)
725                 die_notifier.priority = 0x7FFFFFFF;
726
727         retval = register_die_notifier(&die_notifier);
728         if (retval != 0) {
729                 dev_warn(&dev->dev,
730                         "Unable to register a die notifier (err=%d).\n",
731                         retval);
732                 goto error_die_notifier;
733         }
734
735         retval = misc_register(&hpwdt_miscdev);
736         if (retval < 0) {
737                 dev_warn(&dev->dev,
738                         "Unable to register miscdev on minor=%d (err=%d).\n",
739                         WATCHDOG_MINOR, retval);
740                 goto error_misc_register;
741         }
742
743         printk(KERN_INFO
744                 "hp Watchdog Timer Driver: %s"
745                 ", timer margin: %d seconds (nowayout=%d)"
746                 ", allow kernel dump: %s (default = 0/OFF)"
747                 ", priority: %s (default = 0/LAST).\n",
748                 HPWDT_VERSION, soft_margin, nowayout,
749                 (allow_kdump == 0) ? "OFF" : "ON",
750                 (priority == 0) ? "LAST" : "FIRST");
751
752         return 0;
753
754 error_misc_register:
755         unregister_die_notifier(&die_notifier);
756 error_die_notifier:
757         if (cru_rom_addr)
758                 iounmap(cru_rom_addr);
759 error_get_cru:
760         pci_iounmap(dev, pci_mem_addr);
761 error_pci_iomap:
762         pci_disable_device(dev);
763         return retval;
764 }
765
766 static void __devexit hpwdt_exit(struct pci_dev *dev)
767 {
768         if (!nowayout)
769                 hpwdt_stop();
770
771         misc_deregister(&hpwdt_miscdev);
772         unregister_die_notifier(&die_notifier);
773
774         if (cru_rom_addr)
775                 iounmap(cru_rom_addr);
776         pci_iounmap(dev, pci_mem_addr);
777         pci_disable_device(dev);
778 }
779
780 static struct pci_driver hpwdt_driver = {
781         .name = "hpwdt",
782         .id_table = hpwdt_devices,
783         .probe = hpwdt_init_one,
784         .remove = __devexit_p(hpwdt_exit),
785 };
786
787 static void __exit hpwdt_cleanup(void)
788 {
789         pci_unregister_driver(&hpwdt_driver);
790 }
791
792 static int __init hpwdt_init(void)
793 {
794         return pci_register_driver(&hpwdt_driver);
795 }
796
797 MODULE_AUTHOR("Tom Mingarelli");
798 MODULE_DESCRIPTION("hp watchdog driver");
799 MODULE_LICENSE("GPL");
800 MODULE_VERSION(HPWDT_VERSION);
801 MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
802
803 module_param(soft_margin, int, 0);
804 MODULE_PARM_DESC(soft_margin, "Watchdog timeout in seconds");
805
806 module_param(allow_kdump, int, 0);
807 MODULE_PARM_DESC(allow_kdump, "Start a kernel dump after NMI occurs");
808
809 module_param(nowayout, int, 0);
810 MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default="
811                 __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
812
813 module_param(priority, int, 0);
814 MODULE_PARM_DESC(priority, "The hpwdt driver handles NMIs first or last"
815                 " (default = 0/Last)\n");
816
817 module_init(hpwdt_init);
818 module_exit(hpwdt_cleanup);