00299919df398173bcd3f5031ca6219b18e6a6ad
[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/io.h>
20 #include <linux/bitops.h>
21 #include <linux/kernel.h>
22 #include <linux/miscdevice.h>
23 #include <linux/module.h>
24 #include <linux/moduleparam.h>
25 #include <linux/pci.h>
26 #include <linux/pci_ids.h>
27 #include <linux/types.h>
28 #include <linux/uaccess.h>
29 #include <linux/watchdog.h>
30 #include <linux/dmi.h>
31 #include <linux/spinlock.h>
32 #include <linux/nmi.h>
33 #include <linux/kdebug.h>
34 #include <linux/notifier.h>
35 #include <asm/cacheflush.h>
36
37 #define HPWDT_VERSION                   "1.1.1"
38 #define SECS_TO_TICKS(secs)             ((secs) * 1000 / 128)
39 #define TICKS_TO_SECS(ticks)            ((ticks) * 128 / 1000)
40 #define HPWDT_MAX_TIMER                 TICKS_TO_SECS(65535)
41 #define DEFAULT_MARGIN                  30
42
43 static unsigned int soft_margin = DEFAULT_MARGIN;       /* in seconds */
44 static unsigned int reload;                     /* the computed soft_margin */
45 static int nowayout = WATCHDOG_NOWAYOUT;
46 static char expect_release;
47 static unsigned long hpwdt_is_open;
48
49 static void __iomem *pci_mem_addr;              /* the PCI-memory address */
50 static unsigned long __iomem *hpwdt_timer_reg;
51 static unsigned long __iomem *hpwdt_timer_con;
52
53 static struct pci_device_id hpwdt_devices[] = {
54         { PCI_DEVICE(PCI_VENDOR_ID_COMPAQ, 0xB203) },   /* iLO2 */
55         { PCI_DEVICE(PCI_VENDOR_ID_HP, 0x3306) },       /* iLO3 */
56         {0},                    /* terminate list */
57 };
58 MODULE_DEVICE_TABLE(pci, hpwdt_devices);
59
60 #define PCI_BIOS32_SD_VALUE             0x5F32335F      /* "_32_" */
61 #define CRU_BIOS_SIGNATURE_VALUE        0x55524324
62 #define PCI_BIOS32_PARAGRAPH_LEN        16
63 #define PCI_ROM_BASE1                   0x000F0000
64 #define ROM_SIZE                        0x10000
65
66 struct bios32_service_dir {
67         u32 signature;
68         u32 entry_point;
69         u8 revision;
70         u8 length;
71         u8 checksum;
72         u8 reserved[5];
73 };
74
75 /* type 212 */
76 struct smbios_cru64_info {
77         u8 type;
78         u8 byte_length;
79         u16 handle;
80         u32 signature;
81         u64 physical_address;
82         u32 double_length;
83         u32 double_offset;
84 };
85 #define SMBIOS_CRU64_INFORMATION        212
86
87 struct cmn_registers {
88         union {
89                 struct {
90                         u8 ral;
91                         u8 rah;
92                         u16 rea2;
93                 };
94                 u32 reax;
95         } u1;
96         union {
97                 struct {
98                         u8 rbl;
99                         u8 rbh;
100                         u8 reb2l;
101                         u8 reb2h;
102                 };
103                 u32 rebx;
104         } u2;
105         union {
106                 struct {
107                         u8 rcl;
108                         u8 rch;
109                         u16 rec2;
110                 };
111                 u32 recx;
112         } u3;
113         union {
114                 struct {
115                         u8 rdl;
116                         u8 rdh;
117                         u16 red2;
118                 };
119                 u32 redx;
120         } u4;
121
122         u32 resi;
123         u32 redi;
124         u16 rds;
125         u16 res;
126         u32 reflags;
127 }  __attribute__((packed));
128
129 static unsigned int hpwdt_nmi_sourcing;
130 static unsigned int allow_kdump;
131 static unsigned int priority;           /* hpwdt at end of die_notify list */
132 static DEFINE_SPINLOCK(rom_lock);
133 static void *cru_rom_addr;
134 static struct cmn_registers cmn_regs;
135
136 extern asmlinkage void asminline_call(struct cmn_registers *pi86Regs,
137                                                 unsigned long *pRomEntry);
138
139 #ifdef CONFIG_X86_32
140 /* --32 Bit Bios------------------------------------------------------------ */
141
142 #define HPWDT_ARCH      32
143
144 asm(".text                          \n\t"
145     ".align 4                       \n"
146     "asminline_call:                \n\t"
147     "pushl       %ebp               \n\t"
148     "movl        %esp, %ebp         \n\t"
149     "pusha                          \n\t"
150     "pushf                          \n\t"
151     "push        %es                \n\t"
152     "push        %ds                \n\t"
153     "pop         %es                \n\t"
154     "movl        8(%ebp),%eax       \n\t"
155     "movl        4(%eax),%ebx       \n\t"
156     "movl        8(%eax),%ecx       \n\t"
157     "movl        12(%eax),%edx      \n\t"
158     "movl        16(%eax),%esi      \n\t"
159     "movl        20(%eax),%edi      \n\t"
160     "movl        (%eax),%eax        \n\t"
161     "push        %cs                \n\t"
162     "call        *12(%ebp)          \n\t"
163     "pushf                          \n\t"
164     "pushl       %eax               \n\t"
165     "movl        8(%ebp),%eax       \n\t"
166     "movl        %ebx,4(%eax)       \n\t"
167     "movl        %ecx,8(%eax)       \n\t"
168     "movl        %edx,12(%eax)      \n\t"
169     "movl        %esi,16(%eax)      \n\t"
170     "movl        %edi,20(%eax)      \n\t"
171     "movw        %ds,24(%eax)       \n\t"
172     "movw        %es,26(%eax)       \n\t"
173     "popl        %ebx               \n\t"
174     "movl        %ebx,(%eax)        \n\t"
175     "popl        %ebx               \n\t"
176     "movl        %ebx,28(%eax)      \n\t"
177     "pop         %es                \n\t"
178     "popf                           \n\t"
179     "popa                           \n\t"
180     "leave                          \n\t"
181     "ret                            \n\t"
182     ".previous");
183
184
185 /*
186  *      cru_detect
187  *
188  *      Routine Description:
189  *      This function uses the 32-bit BIOS Service Directory record to
190  *      search for a $CRU record.
191  *
192  *      Return Value:
193  *      0        :  SUCCESS
194  *      <0       :  FAILURE
195  */
196 static int __devinit cru_detect(unsigned long map_entry,
197         unsigned long map_offset)
198 {
199         void *bios32_map;
200         unsigned long *bios32_entrypoint;
201         unsigned long cru_physical_address;
202         unsigned long cru_length;
203         unsigned long physical_bios_base = 0;
204         unsigned long physical_bios_offset = 0;
205         int retval = -ENODEV;
206
207         bios32_map = ioremap(map_entry, (2 * PAGE_SIZE));
208
209         if (bios32_map == NULL)
210                 return -ENODEV;
211
212         bios32_entrypoint = bios32_map + map_offset;
213
214         cmn_regs.u1.reax = CRU_BIOS_SIGNATURE_VALUE;
215
216         asminline_call(&cmn_regs, bios32_entrypoint);
217
218         if (cmn_regs.u1.ral != 0) {
219                 printk(KERN_WARNING
220                         "hpwdt: Call succeeded but with an error: 0x%x\n",
221                         cmn_regs.u1.ral);
222         } else {
223                 physical_bios_base = cmn_regs.u2.rebx;
224                 physical_bios_offset = cmn_regs.u4.redx;
225                 cru_length = cmn_regs.u3.recx;
226                 cru_physical_address =
227                         physical_bios_base + physical_bios_offset;
228
229                 /* If the values look OK, then map it in. */
230                 if ((physical_bios_base + physical_bios_offset)) {
231                         cru_rom_addr =
232                                 ioremap(cru_physical_address, cru_length);
233                         if (cru_rom_addr)
234                                 retval = 0;
235                 }
236
237                 printk(KERN_DEBUG "hpwdt: CRU Base Address:   0x%lx\n",
238                         physical_bios_base);
239                 printk(KERN_DEBUG "hpwdt: CRU Offset Address: 0x%lx\n",
240                         physical_bios_offset);
241                 printk(KERN_DEBUG "hpwdt: CRU Length:         0x%lx\n",
242                         cru_length);
243                 printk(KERN_DEBUG "hpwdt: CRU Mapped Address: %p\n",
244                         &cru_rom_addr);
245         }
246         iounmap(bios32_map);
247         return retval;
248 }
249
250 /*
251  *      bios_checksum
252  */
253 static int __devinit bios_checksum(const char __iomem *ptr, int len)
254 {
255         char sum = 0;
256         int i;
257
258         /*
259          * calculate checksum of size bytes. This should add up
260          * to zero if we have a valid header.
261          */
262         for (i = 0; i < len; i++)
263                 sum += ptr[i];
264
265         return ((sum == 0) && (len > 0));
266 }
267
268 /*
269  *      bios32_present
270  *
271  *      Routine Description:
272  *      This function finds the 32-bit BIOS Service Directory
273  *
274  *      Return Value:
275  *      0        :  SUCCESS
276  *      <0       :  FAILURE
277  */
278 static int __devinit bios32_present(const char __iomem *p)
279 {
280         struct bios32_service_dir *bios_32_ptr;
281         int length;
282         unsigned long map_entry, map_offset;
283
284         bios_32_ptr = (struct bios32_service_dir *) p;
285
286         /*
287          * Search for signature by checking equal to the swizzled value
288          * instead of calling another routine to perform a strcmp.
289          */
290         if (bios_32_ptr->signature == PCI_BIOS32_SD_VALUE) {
291                 length = bios_32_ptr->length * PCI_BIOS32_PARAGRAPH_LEN;
292                 if (bios_checksum(p, length)) {
293                         /*
294                          * According to the spec, we're looking for the
295                          * first 4KB-aligned address below the entrypoint
296                          * listed in the header. The Service Directory code
297                          * is guaranteed to occupy no more than 2 4KB pages.
298                          */
299                         map_entry = bios_32_ptr->entry_point & ~(PAGE_SIZE - 1);
300                         map_offset = bios_32_ptr->entry_point - map_entry;
301
302                         return cru_detect(map_entry, map_offset);
303                 }
304         }
305         return -ENODEV;
306 }
307
308 static int __devinit detect_cru_service(void)
309 {
310         char __iomem *p, *q;
311         int rc = -1;
312
313         /*
314          * Search from 0x0f0000 through 0x0fffff, inclusive.
315          */
316         p = ioremap(PCI_ROM_BASE1, ROM_SIZE);
317         if (p == NULL)
318                 return -ENOMEM;
319
320         for (q = p; q < p + ROM_SIZE; q += 16) {
321                 rc = bios32_present(q);
322                 if (!rc)
323                         break;
324         }
325         iounmap(p);
326         return rc;
327 }
328 /* ------------------------------------------------------------------------- */
329 #endif /* CONFIG_X86_32 */
330 #ifdef CONFIG_X86_64
331 /* --64 Bit Bios------------------------------------------------------------ */
332
333 #define HPWDT_ARCH      64
334
335 asm(".text                      \n\t"
336     ".align 4                   \n"
337     "asminline_call:            \n\t"
338     "pushq      %rbp            \n\t"
339     "movq       %rsp, %rbp      \n\t"
340     "pushq      %rax            \n\t"
341     "pushq      %rbx            \n\t"
342     "pushq      %rdx            \n\t"
343     "pushq      %r12            \n\t"
344     "pushq      %r9             \n\t"
345     "movq       %rsi, %r12      \n\t"
346     "movq       %rdi, %r9       \n\t"
347     "movl       4(%r9),%ebx     \n\t"
348     "movl       8(%r9),%ecx     \n\t"
349     "movl       12(%r9),%edx    \n\t"
350     "movl       16(%r9),%esi    \n\t"
351     "movl       20(%r9),%edi    \n\t"
352     "movl       (%r9),%eax      \n\t"
353     "call       *%r12           \n\t"
354     "pushfq                     \n\t"
355     "popq        %r12           \n\t"
356     "movl       %eax, (%r9)     \n\t"
357     "movl       %ebx, 4(%r9)    \n\t"
358     "movl       %ecx, 8(%r9)    \n\t"
359     "movl       %edx, 12(%r9)   \n\t"
360     "movl       %esi, 16(%r9)   \n\t"
361     "movl       %edi, 20(%r9)   \n\t"
362     "movq       %r12, %rax      \n\t"
363     "movl       %eax, 28(%r9)   \n\t"
364     "popq       %r9             \n\t"
365     "popq       %r12            \n\t"
366     "popq       %rdx            \n\t"
367     "popq       %rbx            \n\t"
368     "popq       %rax            \n\t"
369     "leave                      \n\t"
370     "ret                        \n\t"
371     ".previous");
372
373 /*
374  *      dmi_find_cru
375  *
376  *      Routine Description:
377  *      This function checks whether or not a SMBIOS/DMI record is
378  *      the 64bit CRU info or not
379  */
380 static void __devinit dmi_find_cru(const struct dmi_header *dm, void *dummy)
381 {
382         struct smbios_cru64_info *smbios_cru64_ptr;
383         unsigned long cru_physical_address;
384
385         if (dm->type == SMBIOS_CRU64_INFORMATION) {
386                 smbios_cru64_ptr = (struct smbios_cru64_info *) dm;
387                 if (smbios_cru64_ptr->signature == CRU_BIOS_SIGNATURE_VALUE) {
388                         cru_physical_address =
389                                 smbios_cru64_ptr->physical_address +
390                                 smbios_cru64_ptr->double_offset;
391                         cru_rom_addr = ioremap(cru_physical_address,
392                                 smbios_cru64_ptr->double_length);
393                         set_memory_x((unsigned long)cru_rom_addr & PAGE_MASK,
394                                 smbios_cru64_ptr->double_length >> PAGE_SHIFT);
395                 }
396         }
397 }
398
399 static int __devinit detect_cru_service(void)
400 {
401         cru_rom_addr = NULL;
402
403         dmi_walk(dmi_find_cru, NULL);
404
405         /* if cru_rom_addr has been set then we found a CRU service */
406         return ((cru_rom_addr != NULL) ? 0 : -ENODEV);
407 }
408 /* ------------------------------------------------------------------------- */
409 #endif /* CONFIG_X86_64 */
410
411 /*
412  *      Watchdog operations
413  */
414 static void hpwdt_start(void)
415 {
416         reload = SECS_TO_TICKS(soft_margin);
417         iowrite16(reload, hpwdt_timer_reg);
418         iowrite16(0x85, hpwdt_timer_con);
419 }
420
421 static void hpwdt_stop(void)
422 {
423         unsigned long data;
424
425         data = ioread16(hpwdt_timer_con);
426         data &= 0xFE;
427         iowrite16(data, hpwdt_timer_con);
428 }
429
430 static void hpwdt_ping(void)
431 {
432         iowrite16(reload, hpwdt_timer_reg);
433 }
434
435 static int hpwdt_change_timer(int new_margin)
436 {
437         if (new_margin < 1 || new_margin > HPWDT_MAX_TIMER) {
438                 printk(KERN_WARNING
439                         "hpwdt: New value passed in is invalid: %d seconds.\n",
440                         new_margin);
441                 return -EINVAL;
442         }
443
444         soft_margin = new_margin;
445         printk(KERN_DEBUG
446                 "hpwdt: New timer passed in is %d seconds.\n",
447                 new_margin);
448         reload = SECS_TO_TICKS(soft_margin);
449
450         return 0;
451 }
452
453 /*
454  *      NMI Handler
455  */
456 static int hpwdt_pretimeout(struct notifier_block *nb, unsigned long ulReason,
457                                 void *data)
458 {
459         unsigned long rom_pl;
460         static int die_nmi_called;
461
462         if (ulReason != DIE_NMI && ulReason != DIE_NMI_IPI)
463                 return NOTIFY_OK;
464
465         if (hpwdt_nmi_sourcing) {
466                 spin_lock_irqsave(&rom_lock, rom_pl);
467                 if (!die_nmi_called)
468                         asminline_call(&cmn_regs, cru_rom_addr);
469                 die_nmi_called = 1;
470                 spin_unlock_irqrestore(&rom_lock, rom_pl);
471                 if (cmn_regs.u1.ral == 0) {
472                         printk(KERN_WARNING "hpwdt: An NMI occurred, "
473                                 "but unable to determine source.\n");
474                 } else {
475                         if (allow_kdump)
476                                 hpwdt_stop();
477                         panic("An NMI occurred, please see the Integrated "
478                                 "Management Log for details.\n");
479                 }
480         }
481         return NOTIFY_OK;
482 }
483
484 /*
485  *      /dev/watchdog handling
486  */
487 static int hpwdt_open(struct inode *inode, struct file *file)
488 {
489         /* /dev/watchdog can only be opened once */
490         if (test_and_set_bit(0, &hpwdt_is_open))
491                 return -EBUSY;
492
493         /* Start the watchdog */
494         hpwdt_start();
495         hpwdt_ping();
496
497         return nonseekable_open(inode, file);
498 }
499
500 static int hpwdt_release(struct inode *inode, struct file *file)
501 {
502         /* Stop the watchdog */
503         if (expect_release == 42) {
504                 hpwdt_stop();
505         } else {
506                 printk(KERN_CRIT
507                         "hpwdt: Unexpected close, not stopping watchdog!\n");
508                 hpwdt_ping();
509         }
510
511         expect_release = 0;
512
513         /* /dev/watchdog is being closed, make sure it can be re-opened */
514         clear_bit(0, &hpwdt_is_open);
515
516         return 0;
517 }
518
519 static ssize_t hpwdt_write(struct file *file, const char __user *data,
520         size_t len, loff_t *ppos)
521 {
522         /* See if we got the magic character 'V' and reload the timer */
523         if (len) {
524                 if (!nowayout) {
525                         size_t i;
526
527                         /* note: just in case someone wrote the magic character
528                          * five months ago... */
529                         expect_release = 0;
530
531                         /* scan to see whether or not we got the magic char. */
532                         for (i = 0; i != len; i++) {
533                                 char c;
534                                 if (get_user(c, data + i))
535                                         return -EFAULT;
536                                 if (c == 'V')
537                                         expect_release = 42;
538                         }
539                 }
540
541                 /* someone wrote to us, we should reload the timer */
542                 hpwdt_ping();
543         }
544
545         return len;
546 }
547
548 static const struct watchdog_info ident = {
549         .options = WDIOF_SETTIMEOUT |
550                    WDIOF_KEEPALIVEPING |
551                    WDIOF_MAGICCLOSE,
552         .identity = "HP iLO2+ HW Watchdog Timer",
553 };
554
555 static long hpwdt_ioctl(struct file *file, unsigned int cmd,
556         unsigned long arg)
557 {
558         void __user *argp = (void __user *)arg;
559         int __user *p = argp;
560         int new_margin;
561         int ret = -ENOTTY;
562
563         switch (cmd) {
564         case WDIOC_GETSUPPORT:
565                 ret = 0;
566                 if (copy_to_user(argp, &ident, sizeof(ident)))
567                         ret = -EFAULT;
568                 break;
569
570         case WDIOC_GETSTATUS:
571         case WDIOC_GETBOOTSTATUS:
572                 ret = put_user(0, p);
573                 break;
574
575         case WDIOC_KEEPALIVE:
576                 hpwdt_ping();
577                 ret = 0;
578                 break;
579
580         case WDIOC_SETTIMEOUT:
581                 ret = get_user(new_margin, p);
582                 if (ret)
583                         break;
584
585                 ret = hpwdt_change_timer(new_margin);
586                 if (ret)
587                         break;
588
589                 hpwdt_ping();
590                 /* Fall */
591         case WDIOC_GETTIMEOUT:
592                 ret = put_user(soft_margin, p);
593                 break;
594         }
595         return ret;
596 }
597
598 /*
599  *      Kernel interfaces
600  */
601 static const struct file_operations hpwdt_fops = {
602         .owner = THIS_MODULE,
603         .llseek = no_llseek,
604         .write = hpwdt_write,
605         .unlocked_ioctl = hpwdt_ioctl,
606         .open = hpwdt_open,
607         .release = hpwdt_release,
608 };
609
610 static struct miscdevice hpwdt_miscdev = {
611         .minor = WATCHDOG_MINOR,
612         .name = "watchdog",
613         .fops = &hpwdt_fops,
614 };
615
616 static struct notifier_block die_notifier = {
617         .notifier_call = hpwdt_pretimeout,
618         .priority = 0,
619 };
620
621 /*
622  *      Init & Exit
623  */
624
625 #ifdef ARCH_HAS_NMI_WATCHDOG
626 static void __devinit hpwdt_check_nmi_sourcing(struct pci_dev *dev)
627 {
628         /*
629          * If nmi_watchdog is turned off then we can turn on
630          * our nmi sourcing capability.
631          */
632         if (!nmi_watchdog_active())
633                 hpwdt_nmi_sourcing = 1;
634         else
635                 dev_warn(&dev->dev, "NMI sourcing is disabled. To enable this "
636                         "functionality you must reboot with nmi_watchdog=0 "
637                         "and load the hpwdt driver with priority=1.\n");
638 }
639 #else
640 static void __devinit hpwdt_check_nmi_sourcing(struct pci_dev *dev)
641 {
642         dev_warn(&dev->dev, "NMI sourcing is disabled. "
643                 "Your kernel does not support a NMI Watchdog.\n");
644 }
645 #endif
646
647 static int __devinit hpwdt_init_one(struct pci_dev *dev,
648                                         const struct pci_device_id *ent)
649 {
650         int retval;
651
652         /*
653          * Check if we can do NMI sourcing or not
654          */
655         hpwdt_check_nmi_sourcing(dev);
656
657         /*
658          * First let's find out if we are on an iLO2+ server. We will
659          * not run on a legacy ASM box.
660          * So we only support the G5 ProLiant servers and higher.
661          */
662         if (dev->subsystem_vendor != PCI_VENDOR_ID_HP) {
663                 dev_warn(&dev->dev,
664                         "This server does not have an iLO2+ ASIC.\n");
665                 return -ENODEV;
666         }
667
668         if (pci_enable_device(dev)) {
669                 dev_warn(&dev->dev,
670                         "Not possible to enable PCI Device: 0x%x:0x%x.\n",
671                         ent->vendor, ent->device);
672                 return -ENODEV;
673         }
674
675         pci_mem_addr = pci_iomap(dev, 1, 0x80);
676         if (!pci_mem_addr) {
677                 dev_warn(&dev->dev,
678                         "Unable to detect the iLO2+ server memory.\n");
679                 retval = -ENOMEM;
680                 goto error_pci_iomap;
681         }
682         hpwdt_timer_reg = pci_mem_addr + 0x70;
683         hpwdt_timer_con = pci_mem_addr + 0x72;
684
685         /* Make sure that we have a valid soft_margin */
686         if (hpwdt_change_timer(soft_margin))
687                 hpwdt_change_timer(DEFAULT_MARGIN);
688
689         /*
690          * We need to map the ROM to get the CRU service.
691          * For 32 bit Operating Systems we need to go through the 32 Bit
692          * BIOS Service Directory
693          * For 64 bit Operating Systems we get that service through SMBIOS.
694          */
695         retval = detect_cru_service();
696         if (retval < 0) {
697                 dev_warn(&dev->dev,
698                         "Unable to detect the %d Bit CRU Service.\n",
699                         HPWDT_ARCH);
700                 goto error_get_cru;
701         }
702
703         /*
704          * We know this is the only CRU call we need to make so lets keep as
705          * few instructions as possible once the NMI comes in.
706          */
707         cmn_regs.u1.rah = 0x0D;
708         cmn_regs.u1.ral = 0x02;
709
710         /*
711          * If the priority is set to 1, then we will be put first on the
712          * die notify list to handle a critical NMI. The default is to
713          * be last so other users of the NMI signal can function.
714          */
715         if (priority)
716                 die_notifier.priority = 0x7FFFFFFF;
717
718         retval = register_die_notifier(&die_notifier);
719         if (retval != 0) {
720                 dev_warn(&dev->dev,
721                         "Unable to register a die notifier (err=%d).\n",
722                         retval);
723                 goto error_die_notifier;
724         }
725
726         retval = misc_register(&hpwdt_miscdev);
727         if (retval < 0) {
728                 dev_warn(&dev->dev,
729                         "Unable to register miscdev on minor=%d (err=%d).\n",
730                         WATCHDOG_MINOR, retval);
731                 goto error_misc_register;
732         }
733
734         printk(KERN_INFO
735                 "hp Watchdog Timer Driver: %s"
736                 ", timer margin: %d seconds (nowayout=%d)"
737                 ", allow kernel dump: %s (default = 0/OFF)"
738                 ", priority: %s (default = 0/LAST).\n",
739                 HPWDT_VERSION, soft_margin, nowayout,
740                 (allow_kdump == 0) ? "OFF" : "ON",
741                 (priority == 0) ? "LAST" : "FIRST");
742
743         return 0;
744
745 error_misc_register:
746         unregister_die_notifier(&die_notifier);
747 error_die_notifier:
748         if (cru_rom_addr)
749                 iounmap(cru_rom_addr);
750 error_get_cru:
751         pci_iounmap(dev, pci_mem_addr);
752 error_pci_iomap:
753         pci_disable_device(dev);
754         return retval;
755 }
756
757 static void __devexit hpwdt_exit(struct pci_dev *dev)
758 {
759         if (!nowayout)
760                 hpwdt_stop();
761
762         misc_deregister(&hpwdt_miscdev);
763         unregister_die_notifier(&die_notifier);
764
765         if (cru_rom_addr)
766                 iounmap(cru_rom_addr);
767         pci_iounmap(dev, pci_mem_addr);
768         pci_disable_device(dev);
769 }
770
771 static struct pci_driver hpwdt_driver = {
772         .name = "hpwdt",
773         .id_table = hpwdt_devices,
774         .probe = hpwdt_init_one,
775         .remove = __devexit_p(hpwdt_exit),
776 };
777
778 static void __exit hpwdt_cleanup(void)
779 {
780         pci_unregister_driver(&hpwdt_driver);
781 }
782
783 static int __init hpwdt_init(void)
784 {
785         return pci_register_driver(&hpwdt_driver);
786 }
787
788 MODULE_AUTHOR("Tom Mingarelli");
789 MODULE_DESCRIPTION("hp watchdog driver");
790 MODULE_LICENSE("GPL");
791 MODULE_VERSION(HPWDT_VERSION);
792 MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
793
794 module_param(soft_margin, int, 0);
795 MODULE_PARM_DESC(soft_margin, "Watchdog timeout in seconds");
796
797 module_param(nowayout, int, 0);
798 MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default="
799                 __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
800
801 module_param(allow_kdump, int, 0);
802 MODULE_PARM_DESC(allow_kdump, "Start a kernel dump after NMI occurs");
803
804 module_param(priority, int, 0);
805 MODULE_PARM_DESC(priority, "The hpwdt driver handles NMIs first or last"
806                 " (default = 0/Last)\n");
807
808 module_init(hpwdt_init);
809 module_exit(hpwdt_cleanup);