dad4fe6e20fcadbca98b817ef10d948cfecaba33
[linux-drm-fsl-dcu.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/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/desc.h>
43 #include <asm/cacheflush.h>
44
45 #define PCI_BIOS32_SD_VALUE             0x5F32335F      /* "_32_" */
46 #define CRU_BIOS_SIGNATURE_VALUE        0x55524324
47 #define PCI_BIOS32_PARAGRAPH_LEN        16
48 #define PCI_ROM_BASE1                   0x000F0000
49 #define ROM_SIZE                        0x10000
50 #define HPWDT_VERSION                   "1.01"
51
52 struct bios32_service_dir {
53         u32 signature;
54         u32 entry_point;
55         u8 revision;
56         u8 length;
57         u8 checksum;
58         u8 reserved[5];
59 };
60
61 /* type 212 */
62 struct smbios_cru64_info {
63         u8 type;
64         u8 byte_length;
65         u16 handle;
66         u32 signature;
67         u64 physical_address;
68         u32 double_length;
69         u32 double_offset;
70 };
71 #define SMBIOS_CRU64_INFORMATION        212
72
73 struct cmn_registers {
74         union {
75                 struct {
76                         u8 ral;
77                         u8 rah;
78                         u16 rea2;
79                 };
80                 u32 reax;
81         } u1;
82         union {
83                 struct {
84                         u8 rbl;
85                         u8 rbh;
86                         u8 reb2l;
87                         u8 reb2h;
88                 };
89                 u32 rebx;
90         } u2;
91         union {
92                 struct {
93                         u8 rcl;
94                         u8 rch;
95                         u16 rec2;
96                 };
97                 u32 recx;
98         } u3;
99         union {
100                 struct {
101                         u8 rdl;
102                         u8 rdh;
103                         u16 red2;
104                 };
105                 u32 redx;
106         } u4;
107
108         u32 resi;
109         u32 redi;
110         u16 rds;
111         u16 res;
112         u32 reflags;
113 }  __attribute__((packed));
114
115 #define DEFAULT_MARGIN  30
116 static unsigned int soft_margin = DEFAULT_MARGIN;       /* in seconds */
117 static unsigned int reload;                     /* the computed soft_margin */
118 static int nowayout = WATCHDOG_NOWAYOUT;
119 static char expect_release;
120 static unsigned long hpwdt_is_open;
121 static unsigned int allow_kdump;
122
123 static void __iomem *pci_mem_addr;              /* the PCI-memory address */
124 static unsigned long __iomem *hpwdt_timer_reg;
125 static unsigned long __iomem *hpwdt_timer_con;
126
127 static DEFINE_SPINLOCK(rom_lock);
128
129 static void *cru_rom_addr;
130
131 static struct cmn_registers cmn_regs;
132
133 static struct pci_device_id hpwdt_devices[] = {
134         { PCI_DEVICE(PCI_VENDOR_ID_COMPAQ, 0xB203) },
135         { PCI_DEVICE(PCI_VENDOR_ID_HP, 0x3306) },
136         {0},                    /* terminate list */
137 };
138 MODULE_DEVICE_TABLE(pci, hpwdt_devices);
139
140 extern asmlinkage void asminline_call(struct cmn_registers *pi86Regs, unsigned long *pRomEntry);
141
142 #ifndef CONFIG_X86_64
143 /* --32 Bit Bios------------------------------------------------------------ */
144
145 #define HPWDT_ARCH      32
146
147 asm(".text                          \n\t"
148     ".align 4                       \n"
149     "asminline_call:                \n\t"
150     "pushl       %ebp               \n\t"
151     "movl        %esp, %ebp         \n\t"
152     "pusha                          \n\t"
153     "pushf                          \n\t"
154     "push        %es                \n\t"
155     "push        %ds                \n\t"
156     "pop         %es                \n\t"
157     "movl        8(%ebp),%eax       \n\t"
158     "movl        4(%eax),%ebx       \n\t"
159     "movl        8(%eax),%ecx       \n\t"
160     "movl        12(%eax),%edx      \n\t"
161     "movl        16(%eax),%esi      \n\t"
162     "movl        20(%eax),%edi      \n\t"
163     "movl        (%eax),%eax        \n\t"
164     "push        %cs                \n\t"
165     "call        *12(%ebp)          \n\t"
166     "pushf                          \n\t"
167     "pushl       %eax               \n\t"
168     "movl        8(%ebp),%eax       \n\t"
169     "movl        %ebx,4(%eax)       \n\t"
170     "movl        %ecx,8(%eax)       \n\t"
171     "movl        %edx,12(%eax)      \n\t"
172     "movl        %esi,16(%eax)      \n\t"
173     "movl        %edi,20(%eax)      \n\t"
174     "movw        %ds,24(%eax)       \n\t"
175     "movw        %es,26(%eax)       \n\t"
176     "popl        %ebx               \n\t"
177     "movl        %ebx,(%eax)        \n\t"
178     "popl        %ebx               \n\t"
179     "movl        %ebx,28(%eax)      \n\t"
180     "pop         %es                \n\t"
181     "popf                           \n\t"
182     "popa                           \n\t"
183     "leave                          \n\t"
184     "ret                            \n\t"
185     ".previous");
186
187
188 /*
189  *      cru_detect
190  *
191  *      Routine Description:
192  *      This function uses the 32-bit BIOS Service Directory record to
193  *      search for a $CRU record.
194  *
195  *      Return Value:
196  *      0        :  SUCCESS
197  *      <0       :  FAILURE
198  */
199 static int __devinit cru_detect(unsigned long map_entry,
200         unsigned long map_offset)
201 {
202         void *bios32_map;
203         unsigned long *bios32_entrypoint;
204         unsigned long cru_physical_address;
205         unsigned long cru_length;
206         unsigned long physical_bios_base = 0;
207         unsigned long physical_bios_offset = 0;
208         int retval = -ENODEV;
209
210         bios32_map = ioremap(map_entry, (2 * PAGE_SIZE));
211
212         if (bios32_map == NULL)
213                 return -ENODEV;
214
215         bios32_entrypoint = bios32_map + map_offset;
216
217         cmn_regs.u1.reax = CRU_BIOS_SIGNATURE_VALUE;
218
219         asminline_call(&cmn_regs, bios32_entrypoint);
220
221         if (cmn_regs.u1.ral != 0) {
222                 printk(KERN_WARNING
223                         "hpwdt: Call succeeded but with an error: 0x%x\n",
224                         cmn_regs.u1.ral);
225         } else {
226                 physical_bios_base = cmn_regs.u2.rebx;
227                 physical_bios_offset = cmn_regs.u4.redx;
228                 cru_length = cmn_regs.u3.recx;
229                 cru_physical_address =
230                         physical_bios_base + physical_bios_offset;
231
232                 /* If the values look OK, then map it in. */
233                 if ((physical_bios_base + physical_bios_offset)) {
234                         cru_rom_addr =
235                                 ioremap(cru_physical_address, cru_length);
236                         if (cru_rom_addr)
237                                 retval = 0;
238                 }
239
240                 printk(KERN_DEBUG "hpwdt: CRU Base Address:   0x%lx\n",
241                         physical_bios_base);
242                 printk(KERN_DEBUG "hpwdt: CRU Offset Address: 0x%lx\n",
243                         physical_bios_offset);
244                 printk(KERN_DEBUG "hpwdt: CRU Length:         0x%lx\n",
245                         cru_length);
246                 printk(KERN_DEBUG "hpwdt: CRU Mapped Address: 0x%x\n",
247                         (unsigned int)&cru_rom_addr);
248         }
249         iounmap(bios32_map);
250         return retval;
251 }
252
253 /*
254  *      bios_checksum
255  */
256 static int __devinit bios_checksum(const char __iomem *ptr, int len)
257 {
258         char sum = 0;
259         int i;
260
261         /*
262          * calculate checksum of size bytes. This should add up
263          * to zero if we have a valid header.
264          */
265         for (i = 0; i < len; i++)
266                 sum += ptr[i];
267
268         return ((sum == 0) && (len > 0));
269 }
270
271 /*
272  *      bios32_present
273  *
274  *      Routine Description:
275  *      This function finds the 32-bit BIOS Service Directory
276  *
277  *      Return Value:
278  *      0        :  SUCCESS
279  *      <0       :  FAILURE
280  */
281 static int __devinit bios32_present(const char __iomem *p)
282 {
283         struct bios32_service_dir *bios_32_ptr;
284         int length;
285         unsigned long map_entry, map_offset;
286
287         bios_32_ptr = (struct bios32_service_dir *) p;
288
289         /*
290          * Search for signature by checking equal to the swizzled value
291          * instead of calling another routine to perform a strcmp.
292          */
293         if (bios_32_ptr->signature == PCI_BIOS32_SD_VALUE) {
294                 length = bios_32_ptr->length * PCI_BIOS32_PARAGRAPH_LEN;
295                 if (bios_checksum(p, length)) {
296                         /*
297                          * According to the spec, we're looking for the
298                          * first 4KB-aligned address below the entrypoint
299                          * listed in the header. The Service Directory code
300                          * is guaranteed to occupy no more than 2 4KB pages.
301                          */
302                         map_entry = bios_32_ptr->entry_point & ~(PAGE_SIZE - 1);
303                         map_offset = bios_32_ptr->entry_point - map_entry;
304
305                         return cru_detect(map_entry, map_offset);
306                 }
307         }
308         return -ENODEV;
309 }
310
311 static int __devinit detect_cru_service(void)
312 {
313         char __iomem *p, *q;
314         int rc = -1;
315
316         /*
317          * Search from 0x0f0000 through 0x0fffff, inclusive.
318          */
319         p = ioremap(PCI_ROM_BASE1, ROM_SIZE);
320         if (p == NULL)
321                 return -ENOMEM;
322
323         for (q = p; q < p + ROM_SIZE; q += 16) {
324                 rc = bios32_present(q);
325                 if (!rc)
326                         break;
327         }
328         iounmap(p);
329         return rc;
330 }
331
332 #else
333 /* --64 Bit Bios------------------------------------------------------------ */
334
335 #define HPWDT_ARCH      64
336
337 asm(".text                      \n\t"
338     ".align 4                   \n"
339     "asminline_call:            \n\t"
340     "pushq      %rbp            \n\t"
341     "movq       %rsp, %rbp      \n\t"
342     "pushq      %rax            \n\t"
343     "pushq      %rbx            \n\t"
344     "pushq      %rdx            \n\t"
345     "pushq      %r12            \n\t"
346     "pushq      %r9             \n\t"
347     "movq       %rsi, %r12      \n\t"
348     "movq       %rdi, %r9       \n\t"
349     "movl       4(%r9),%ebx     \n\t"
350     "movl       8(%r9),%ecx     \n\t"
351     "movl       12(%r9),%edx    \n\t"
352     "movl       16(%r9),%esi    \n\t"
353     "movl       20(%r9),%edi    \n\t"
354     "movl       (%r9),%eax      \n\t"
355     "call       *%r12           \n\t"
356     "pushfq                     \n\t"
357     "popq        %r12           \n\t"
358     "movl       %eax, (%r9)     \n\t"
359     "movl       %ebx, 4(%r9)    \n\t"
360     "movl       %ecx, 8(%r9)    \n\t"
361     "movl       %edx, 12(%r9)   \n\t"
362     "movl       %esi, 16(%r9)   \n\t"
363     "movl       %edi, 20(%r9)   \n\t"
364     "movq       %r12, %rax      \n\t"
365     "movl       %eax, 28(%r9)   \n\t"
366     "popq       %r9             \n\t"
367     "popq       %r12            \n\t"
368     "popq       %rdx            \n\t"
369     "popq       %rbx            \n\t"
370     "popq       %rax            \n\t"
371     "leave                      \n\t"
372     "ret                        \n\t"
373     ".previous");
374
375 /*
376  *      dmi_find_cru
377  *
378  *      Routine Description:
379  *      This function checks whether or not a SMBIOS/DMI record is
380  *      the 64bit CRU info or not
381  */
382 static void __devinit dmi_find_cru(const struct dmi_header *dm)
383 {
384         struct smbios_cru64_info *smbios_cru64_ptr;
385         unsigned long cru_physical_address;
386
387         if (dm->type == SMBIOS_CRU64_INFORMATION) {
388                 smbios_cru64_ptr = (struct smbios_cru64_info *) dm;
389                 if (smbios_cru64_ptr->signature == CRU_BIOS_SIGNATURE_VALUE) {
390                         cru_physical_address =
391                                 smbios_cru64_ptr->physical_address +
392                                 smbios_cru64_ptr->double_offset;
393                         cru_rom_addr = ioremap(cru_physical_address,
394                                 smbios_cru64_ptr->double_length);
395                         set_memory_x((unsigned long)cru_rom_addr & PAGE_MASK,
396                                 smbios_cru64_ptr->double_length >> PAGE_SHIFT);
397                 }
398         }
399 }
400
401 static int __devinit detect_cru_service(void)
402 {
403         cru_rom_addr = NULL;
404
405         dmi_walk(dmi_find_cru);
406
407         /* if cru_rom_addr has been set then we found a CRU service */
408         return ((cru_rom_addr != NULL) ? 0 : -ENODEV);
409 }
410
411 /* ------------------------------------------------------------------------- */
412
413 #endif
414
415 /*
416  *      Watchdog operations
417  */
418 static 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
425 static 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
434 static void hpwdt_ping(void)
435 {
436         iowrite16(reload, hpwdt_timer_reg);
437 }
438
439 static 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 /*
459  *      NMI Handler
460  */
461 static 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_OK;
486 }
487
488 /*
489  *      /dev/watchdog handling
490  */
491 static 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
504 static 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
523 static 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
552 static struct watchdog_info ident = {
553         .options = WDIOF_SETTIMEOUT |
554                    WDIOF_KEEPALIVEPING |
555                    WDIOF_MAGICCLOSE,
556         .identity = "HP iLO2 HW Watchdog Timer",
557 };
558
559 static 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  */
605 static 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
614 static struct miscdevice hpwdt_miscdev = {
615         .minor = WATCHDOG_MINOR,
616         .name = "watchdog",
617         .fops = &hpwdt_fops,
618 };
619
620 static struct notifier_block die_notifier = {
621         .notifier_call = hpwdt_pretimeout,
622         .priority = 0x7FFFFFFF,
623 };
624
625 /*
626  *      Init & Exit
627  */
628
629 static 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          * So we only support the G5 ProLiant servers and higher.
638          */
639         if (dev->subsystem_vendor != PCI_VENDOR_ID_HP) {
640                 dev_warn(&dev->dev,
641                         "This server does not have an iLO2 ASIC.\n");
642                 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,
675                         "Unable to detect the %d Bit CRU Service.\n",
676                         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,
690                         "Unable to register a die notifier (err=%d).\n",
691                         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: %s"
705                 ", timer margin: %d seconds (nowayout=%d)"
706                 ", allow kernel dump: %s (default = 0/OFF).\n",
707                 HPWDT_VERSION, soft_margin, nowayout,
708                 (allow_kdump == 0) ? "OFF" : "ON");
709
710         return 0;
711
712 error_misc_register:
713         unregister_die_notifier(&die_notifier);
714 error_die_notifier:
715         if (cru_rom_addr)
716                 iounmap(cru_rom_addr);
717 error_get_cru:
718         pci_iounmap(dev, pci_mem_addr);
719 error_pci_iomap:
720         pci_disable_device(dev);
721         return retval;
722 }
723
724 static void __devexit hpwdt_exit(struct pci_dev *dev)
725 {
726         if (!nowayout)
727                 hpwdt_stop();
728
729         misc_deregister(&hpwdt_miscdev);
730         unregister_die_notifier(&die_notifier);
731
732         if (cru_rom_addr)
733                 iounmap(cru_rom_addr);
734         pci_iounmap(dev, pci_mem_addr);
735         pci_disable_device(dev);
736 }
737
738 static struct pci_driver hpwdt_driver = {
739         .name = "hpwdt",
740         .id_table = hpwdt_devices,
741         .probe = hpwdt_init_one,
742         .remove = __devexit_p(hpwdt_exit),
743 };
744
745 static void __exit hpwdt_cleanup(void)
746 {
747         pci_unregister_driver(&hpwdt_driver);
748 }
749
750 static int __init hpwdt_init(void)
751 {
752         return pci_register_driver(&hpwdt_driver);
753 }
754
755 MODULE_AUTHOR("Tom Mingarelli");
756 MODULE_DESCRIPTION("hp watchdog driver");
757 MODULE_LICENSE("GPL");
758 MODULE_VERSION(HPWDT_VERSION);
759 MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
760
761 module_param(soft_margin, int, 0);
762 MODULE_PARM_DESC(soft_margin, "Watchdog timeout in seconds");
763
764 module_param(allow_kdump, int, 0);
765 MODULE_PARM_DESC(allow_kdump, "Start a kernel dump after NMI occurs");
766
767 module_param(nowayout, int, 0);
768 MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default="
769                 __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
770
771 module_init(hpwdt_init);
772 module_exit(hpwdt_cleanup);