media: soc_camera: tegra: fix one building warning
[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 #ifdef CONFIG_HPWDT_NMI_DECODING
31 #include <linux/dmi.h>
32 #include <linux/spinlock.h>
33 #include <linux/nmi.h>
34 #include <linux/kdebug.h>
35 #include <linux/notifier.h>
36 #include <asm/cacheflush.h>
37 #endif /* CONFIG_HPWDT_NMI_DECODING */
38
39 #define HPWDT_VERSION                   "1.3.0"
40 #define SECS_TO_TICKS(secs)             ((secs) * 1000 / 128)
41 #define TICKS_TO_SECS(ticks)            ((ticks) * 128 / 1000)
42 #define HPWDT_MAX_TIMER                 TICKS_TO_SECS(65535)
43 #define DEFAULT_MARGIN                  30
44
45 static unsigned int soft_margin = DEFAULT_MARGIN;       /* in seconds */
46 static unsigned int reload;                     /* the computed soft_margin */
47 static int nowayout = WATCHDOG_NOWAYOUT;
48 static char expect_release;
49 static unsigned long hpwdt_is_open;
50
51 static void __iomem *pci_mem_addr;              /* the PCI-memory address */
52 static unsigned long __iomem *hpwdt_timer_reg;
53 static unsigned long __iomem *hpwdt_timer_con;
54
55 static DEFINE_PCI_DEVICE_TABLE(hpwdt_devices) = {
56         { PCI_DEVICE(PCI_VENDOR_ID_COMPAQ, 0xB203) },   /* iLO2 */
57         { PCI_DEVICE(PCI_VENDOR_ID_HP, 0x3306) },       /* iLO3 */
58         {0},                    /* terminate list */
59 };
60 MODULE_DEVICE_TABLE(pci, hpwdt_devices);
61
62 #ifdef CONFIG_HPWDT_NMI_DECODING
63 #define PCI_BIOS32_SD_VALUE             0x5F32335F      /* "_32_" */
64 #define CRU_BIOS_SIGNATURE_VALUE        0x55524324
65 #define PCI_BIOS32_PARAGRAPH_LEN        16
66 #define PCI_ROM_BASE1                   0x000F0000
67 #define ROM_SIZE                        0x10000
68
69 struct bios32_service_dir {
70         u32 signature;
71         u32 entry_point;
72         u8 revision;
73         u8 length;
74         u8 checksum;
75         u8 reserved[5];
76 };
77
78 /* type 212 */
79 struct smbios_cru64_info {
80         u8 type;
81         u8 byte_length;
82         u16 handle;
83         u32 signature;
84         u64 physical_address;
85         u32 double_length;
86         u32 double_offset;
87 };
88 #define SMBIOS_CRU64_INFORMATION        212
89
90 /* type 219 */
91 struct smbios_proliant_info {
92         u8 type;
93         u8 byte_length;
94         u16 handle;
95         u32 power_features;
96         u32 omega_features;
97         u32 reserved;
98         u32 misc_features;
99 };
100 #define SMBIOS_ICRU_INFORMATION         219
101
102
103 struct cmn_registers {
104         union {
105                 struct {
106                         u8 ral;
107                         u8 rah;
108                         u16 rea2;
109                 };
110                 u32 reax;
111         } u1;
112         union {
113                 struct {
114                         u8 rbl;
115                         u8 rbh;
116                         u8 reb2l;
117                         u8 reb2h;
118                 };
119                 u32 rebx;
120         } u2;
121         union {
122                 struct {
123                         u8 rcl;
124                         u8 rch;
125                         u16 rec2;
126                 };
127                 u32 recx;
128         } u3;
129         union {
130                 struct {
131                         u8 rdl;
132                         u8 rdh;
133                         u16 red2;
134                 };
135                 u32 redx;
136         } u4;
137
138         u32 resi;
139         u32 redi;
140         u16 rds;
141         u16 res;
142         u32 reflags;
143 }  __attribute__((packed));
144
145 static unsigned int hpwdt_nmi_decoding;
146 static unsigned int allow_kdump;
147 static unsigned int priority;           /* hpwdt at end of die_notify list */
148 static unsigned int is_icru;
149 static DEFINE_SPINLOCK(rom_lock);
150 static void *cru_rom_addr;
151 static struct cmn_registers cmn_regs;
152
153 extern asmlinkage void asminline_call(struct cmn_registers *pi86Regs,
154                                                 unsigned long *pRomEntry);
155
156 #ifdef CONFIG_X86_32
157 /* --32 Bit Bios------------------------------------------------------------ */
158
159 #define HPWDT_ARCH      32
160
161 asm(".text                          \n\t"
162     ".align 4                       \n"
163     "asminline_call:                \n\t"
164     "pushl       %ebp               \n\t"
165     "movl        %esp, %ebp         \n\t"
166     "pusha                          \n\t"
167     "pushf                          \n\t"
168     "push        %es                \n\t"
169     "push        %ds                \n\t"
170     "pop         %es                \n\t"
171     "movl        8(%ebp),%eax       \n\t"
172     "movl        4(%eax),%ebx       \n\t"
173     "movl        8(%eax),%ecx       \n\t"
174     "movl        12(%eax),%edx      \n\t"
175     "movl        16(%eax),%esi      \n\t"
176     "movl        20(%eax),%edi      \n\t"
177     "movl        (%eax),%eax        \n\t"
178     "push        %cs                \n\t"
179     "call        *12(%ebp)          \n\t"
180     "pushf                          \n\t"
181     "pushl       %eax               \n\t"
182     "movl        8(%ebp),%eax       \n\t"
183     "movl        %ebx,4(%eax)       \n\t"
184     "movl        %ecx,8(%eax)       \n\t"
185     "movl        %edx,12(%eax)      \n\t"
186     "movl        %esi,16(%eax)      \n\t"
187     "movl        %edi,20(%eax)      \n\t"
188     "movw        %ds,24(%eax)       \n\t"
189     "movw        %es,26(%eax)       \n\t"
190     "popl        %ebx               \n\t"
191     "movl        %ebx,(%eax)        \n\t"
192     "popl        %ebx               \n\t"
193     "movl        %ebx,28(%eax)      \n\t"
194     "pop         %es                \n\t"
195     "popf                           \n\t"
196     "popa                           \n\t"
197     "leave                          \n\t"
198     "ret                            \n\t"
199     ".previous");
200
201
202 /*
203  *      cru_detect
204  *
205  *      Routine Description:
206  *      This function uses the 32-bit BIOS Service Directory record to
207  *      search for a $CRU record.
208  *
209  *      Return Value:
210  *      0        :  SUCCESS
211  *      <0       :  FAILURE
212  */
213 static int __devinit cru_detect(unsigned long map_entry,
214         unsigned long map_offset)
215 {
216         void *bios32_map;
217         unsigned long *bios32_entrypoint;
218         unsigned long cru_physical_address;
219         unsigned long cru_length;
220         unsigned long physical_bios_base = 0;
221         unsigned long physical_bios_offset = 0;
222         int retval = -ENODEV;
223
224         bios32_map = ioremap(map_entry, (2 * PAGE_SIZE));
225
226         if (bios32_map == NULL)
227                 return -ENODEV;
228
229         bios32_entrypoint = bios32_map + map_offset;
230
231         cmn_regs.u1.reax = CRU_BIOS_SIGNATURE_VALUE;
232
233         set_memory_x((unsigned long)bios32_entrypoint, (2 * PAGE_SIZE));
234         asminline_call(&cmn_regs, bios32_entrypoint);
235
236         if (cmn_regs.u1.ral != 0) {
237                 printk(KERN_WARNING
238                         "hpwdt: Call succeeded but with an error: 0x%x\n",
239                         cmn_regs.u1.ral);
240         } else {
241                 physical_bios_base = cmn_regs.u2.rebx;
242                 physical_bios_offset = cmn_regs.u4.redx;
243                 cru_length = cmn_regs.u3.recx;
244                 cru_physical_address =
245                         physical_bios_base + physical_bios_offset;
246
247                 /* If the values look OK, then map it in. */
248                 if ((physical_bios_base + physical_bios_offset)) {
249                         cru_rom_addr =
250                                 ioremap(cru_physical_address, cru_length);
251                         if (cru_rom_addr) {
252                                 set_memory_x((unsigned long)cru_rom_addr, cru_length);
253                                 retval = 0;
254                         }
255                 }
256
257                 printk(KERN_DEBUG "hpwdt: CRU Base Address:   0x%lx\n",
258                         physical_bios_base);
259                 printk(KERN_DEBUG "hpwdt: CRU Offset Address: 0x%lx\n",
260                         physical_bios_offset);
261                 printk(KERN_DEBUG "hpwdt: CRU Length:         0x%lx\n",
262                         cru_length);
263                 printk(KERN_DEBUG "hpwdt: CRU Mapped Address: %p\n",
264                         &cru_rom_addr);
265         }
266         iounmap(bios32_map);
267         return retval;
268 }
269
270 /*
271  *      bios_checksum
272  */
273 static int __devinit bios_checksum(const char __iomem *ptr, int len)
274 {
275         char sum = 0;
276         int i;
277
278         /*
279          * calculate checksum of size bytes. This should add up
280          * to zero if we have a valid header.
281          */
282         for (i = 0; i < len; i++)
283                 sum += ptr[i];
284
285         return ((sum == 0) && (len > 0));
286 }
287
288 /*
289  *      bios32_present
290  *
291  *      Routine Description:
292  *      This function finds the 32-bit BIOS Service Directory
293  *
294  *      Return Value:
295  *      0        :  SUCCESS
296  *      <0       :  FAILURE
297  */
298 static int __devinit bios32_present(const char __iomem *p)
299 {
300         struct bios32_service_dir *bios_32_ptr;
301         int length;
302         unsigned long map_entry, map_offset;
303
304         bios_32_ptr = (struct bios32_service_dir *) p;
305
306         /*
307          * Search for signature by checking equal to the swizzled value
308          * instead of calling another routine to perform a strcmp.
309          */
310         if (bios_32_ptr->signature == PCI_BIOS32_SD_VALUE) {
311                 length = bios_32_ptr->length * PCI_BIOS32_PARAGRAPH_LEN;
312                 if (bios_checksum(p, length)) {
313                         /*
314                          * According to the spec, we're looking for the
315                          * first 4KB-aligned address below the entrypoint
316                          * listed in the header. The Service Directory code
317                          * is guaranteed to occupy no more than 2 4KB pages.
318                          */
319                         map_entry = bios_32_ptr->entry_point & ~(PAGE_SIZE - 1);
320                         map_offset = bios_32_ptr->entry_point - map_entry;
321
322                         return cru_detect(map_entry, map_offset);
323                 }
324         }
325         return -ENODEV;
326 }
327
328 static int __devinit detect_cru_service(void)
329 {
330         char __iomem *p, *q;
331         int rc = -1;
332
333         /*
334          * Search from 0x0f0000 through 0x0fffff, inclusive.
335          */
336         p = ioremap(PCI_ROM_BASE1, ROM_SIZE);
337         if (p == NULL)
338                 return -ENOMEM;
339
340         for (q = p; q < p + ROM_SIZE; q += 16) {
341                 rc = bios32_present(q);
342                 if (!rc)
343                         break;
344         }
345         iounmap(p);
346         return rc;
347 }
348 /* ------------------------------------------------------------------------- */
349 #endif /* CONFIG_X86_32 */
350 #ifdef CONFIG_X86_64
351 /* --64 Bit Bios------------------------------------------------------------ */
352
353 #define HPWDT_ARCH      64
354
355 asm(".text                      \n\t"
356     ".align 4                   \n"
357     "asminline_call:            \n\t"
358     "pushq      %rbp            \n\t"
359     "movq       %rsp, %rbp      \n\t"
360     "pushq      %rax            \n\t"
361     "pushq      %rbx            \n\t"
362     "pushq      %rdx            \n\t"
363     "pushq      %r12            \n\t"
364     "pushq      %r9             \n\t"
365     "movq       %rsi, %r12      \n\t"
366     "movq       %rdi, %r9       \n\t"
367     "movl       4(%r9),%ebx     \n\t"
368     "movl       8(%r9),%ecx     \n\t"
369     "movl       12(%r9),%edx    \n\t"
370     "movl       16(%r9),%esi    \n\t"
371     "movl       20(%r9),%edi    \n\t"
372     "movl       (%r9),%eax      \n\t"
373     "call       *%r12           \n\t"
374     "pushfq                     \n\t"
375     "popq        %r12           \n\t"
376     "movl       %eax, (%r9)     \n\t"
377     "movl       %ebx, 4(%r9)    \n\t"
378     "movl       %ecx, 8(%r9)    \n\t"
379     "movl       %edx, 12(%r9)   \n\t"
380     "movl       %esi, 16(%r9)   \n\t"
381     "movl       %edi, 20(%r9)   \n\t"
382     "movq       %r12, %rax      \n\t"
383     "movl       %eax, 28(%r9)   \n\t"
384     "popq       %r9             \n\t"
385     "popq       %r12            \n\t"
386     "popq       %rdx            \n\t"
387     "popq       %rbx            \n\t"
388     "popq       %rax            \n\t"
389     "leave                      \n\t"
390     "ret                        \n\t"
391     ".previous");
392
393 /*
394  *      dmi_find_cru
395  *
396  *      Routine Description:
397  *      This function checks whether or not a SMBIOS/DMI record is
398  *      the 64bit CRU info or not
399  */
400 static void __devinit dmi_find_cru(const struct dmi_header *dm, void *dummy)
401 {
402         struct smbios_cru64_info *smbios_cru64_ptr;
403         unsigned long cru_physical_address;
404
405         if (dm->type == SMBIOS_CRU64_INFORMATION) {
406                 smbios_cru64_ptr = (struct smbios_cru64_info *) dm;
407                 if (smbios_cru64_ptr->signature == CRU_BIOS_SIGNATURE_VALUE) {
408                         cru_physical_address =
409                                 smbios_cru64_ptr->physical_address +
410                                 smbios_cru64_ptr->double_offset;
411                         cru_rom_addr = ioremap(cru_physical_address,
412                                 smbios_cru64_ptr->double_length);
413                         set_memory_x((unsigned long)cru_rom_addr & PAGE_MASK,
414                                 smbios_cru64_ptr->double_length >> PAGE_SHIFT);
415                 }
416         }
417 }
418
419 static int __devinit detect_cru_service(void)
420 {
421         cru_rom_addr = NULL;
422
423         dmi_walk(dmi_find_cru, NULL);
424
425         /* if cru_rom_addr has been set then we found a CRU service */
426         return ((cru_rom_addr != NULL) ? 0 : -ENODEV);
427 }
428 /* ------------------------------------------------------------------------- */
429 #endif /* CONFIG_X86_64 */
430 #endif /* CONFIG_HPWDT_NMI_DECODING */
431
432 /*
433  *      Watchdog operations
434  */
435 static void hpwdt_start(void)
436 {
437         reload = SECS_TO_TICKS(soft_margin);
438         iowrite16(reload, hpwdt_timer_reg);
439         iowrite16(0x85, hpwdt_timer_con);
440 }
441
442 static void hpwdt_stop(void)
443 {
444         unsigned long data;
445
446         data = ioread16(hpwdt_timer_con);
447         data &= 0xFE;
448         iowrite16(data, hpwdt_timer_con);
449 }
450
451 static void hpwdt_ping(void)
452 {
453         iowrite16(reload, hpwdt_timer_reg);
454 }
455
456 static int hpwdt_change_timer(int new_margin)
457 {
458         if (new_margin < 1 || new_margin > HPWDT_MAX_TIMER) {
459                 printk(KERN_WARNING
460                         "hpwdt: New value passed in is invalid: %d seconds.\n",
461                         new_margin);
462                 return -EINVAL;
463         }
464
465         soft_margin = new_margin;
466         printk(KERN_DEBUG
467                 "hpwdt: New timer passed in is %d seconds.\n",
468                 new_margin);
469         reload = SECS_TO_TICKS(soft_margin);
470
471         return 0;
472 }
473
474 static int hpwdt_time_left(void)
475 {
476         return TICKS_TO_SECS(ioread16(hpwdt_timer_reg));
477 }
478
479 #ifdef CONFIG_HPWDT_NMI_DECODING
480 /*
481  *      NMI Handler
482  */
483 static int hpwdt_pretimeout(struct notifier_block *nb, unsigned long ulReason,
484                                 void *data)
485 {
486         unsigned long rom_pl;
487         static int die_nmi_called;
488
489         if (ulReason != DIE_NMIUNKNOWN)
490                 goto out;
491
492         if (!hpwdt_nmi_decoding)
493                 goto out;
494
495         spin_lock_irqsave(&rom_lock, rom_pl);
496         if (!die_nmi_called && !is_icru)
497                 asminline_call(&cmn_regs, cru_rom_addr);
498         die_nmi_called = 1;
499         spin_unlock_irqrestore(&rom_lock, rom_pl);
500
501         if (allow_kdump)
502                 hpwdt_stop();
503
504         if (!is_icru) {
505                 if (cmn_regs.u1.ral == 0) {
506                         panic("An NMI occurred, "
507                                 "but unable to determine source.\n");
508                 }
509         }
510         panic("An NMI occurred, please see the Integrated "
511                 "Management Log for details.\n");
512
513 out:
514         return NOTIFY_OK;
515 }
516 #endif /* CONFIG_HPWDT_NMI_DECODING */
517
518 /*
519  *      /dev/watchdog handling
520  */
521 static int hpwdt_open(struct inode *inode, struct file *file)
522 {
523         /* /dev/watchdog can only be opened once */
524         if (test_and_set_bit(0, &hpwdt_is_open))
525                 return -EBUSY;
526
527         /* Start the watchdog */
528         hpwdt_start();
529         hpwdt_ping();
530
531         return nonseekable_open(inode, file);
532 }
533
534 static int hpwdt_release(struct inode *inode, struct file *file)
535 {
536         /* Stop the watchdog */
537         if (expect_release == 42) {
538                 hpwdt_stop();
539         } else {
540                 printk(KERN_CRIT
541                         "hpwdt: Unexpected close, not stopping watchdog!\n");
542                 hpwdt_ping();
543         }
544
545         expect_release = 0;
546
547         /* /dev/watchdog is being closed, make sure it can be re-opened */
548         clear_bit(0, &hpwdt_is_open);
549
550         return 0;
551 }
552
553 static ssize_t hpwdt_write(struct file *file, const char __user *data,
554         size_t len, loff_t *ppos)
555 {
556         /* See if we got the magic character 'V' and reload the timer */
557         if (len) {
558                 if (!nowayout) {
559                         size_t i;
560
561                         /* note: just in case someone wrote the magic character
562                          * five months ago... */
563                         expect_release = 0;
564
565                         /* scan to see whether or not we got the magic char. */
566                         for (i = 0; i != len; i++) {
567                                 char c;
568                                 if (get_user(c, data + i))
569                                         return -EFAULT;
570                                 if (c == 'V')
571                                         expect_release = 42;
572                         }
573                 }
574
575                 /* someone wrote to us, we should reload the timer */
576                 hpwdt_ping();
577         }
578
579         return len;
580 }
581
582 static const struct watchdog_info ident = {
583         .options = WDIOF_SETTIMEOUT |
584                    WDIOF_KEEPALIVEPING |
585                    WDIOF_MAGICCLOSE,
586         .identity = "HP iLO2+ HW Watchdog Timer",
587 };
588
589 static long hpwdt_ioctl(struct file *file, unsigned int cmd,
590         unsigned long arg)
591 {
592         void __user *argp = (void __user *)arg;
593         int __user *p = argp;
594         int new_margin;
595         int ret = -ENOTTY;
596
597         switch (cmd) {
598         case WDIOC_GETSUPPORT:
599                 ret = 0;
600                 if (copy_to_user(argp, &ident, sizeof(ident)))
601                         ret = -EFAULT;
602                 break;
603
604         case WDIOC_GETSTATUS:
605         case WDIOC_GETBOOTSTATUS:
606                 ret = put_user(0, p);
607                 break;
608
609         case WDIOC_KEEPALIVE:
610                 hpwdt_ping();
611                 ret = 0;
612                 break;
613
614         case WDIOC_SETTIMEOUT:
615                 ret = get_user(new_margin, p);
616                 if (ret)
617                         break;
618
619                 ret = hpwdt_change_timer(new_margin);
620                 if (ret)
621                         break;
622
623                 hpwdt_ping();
624                 /* Fall */
625         case WDIOC_GETTIMEOUT:
626                 ret = put_user(soft_margin, p);
627                 break;
628
629         case WDIOC_GETTIMELEFT:
630                 ret = put_user(hpwdt_time_left(), p);
631                 break;
632         }
633         return ret;
634 }
635
636 /*
637  *      Kernel interfaces
638  */
639 static const struct file_operations hpwdt_fops = {
640         .owner = THIS_MODULE,
641         .llseek = no_llseek,
642         .write = hpwdt_write,
643         .unlocked_ioctl = hpwdt_ioctl,
644         .open = hpwdt_open,
645         .release = hpwdt_release,
646 };
647
648 static struct miscdevice hpwdt_miscdev = {
649         .minor = WATCHDOG_MINOR,
650         .name = "watchdog",
651         .fops = &hpwdt_fops,
652 };
653
654 #ifdef CONFIG_HPWDT_NMI_DECODING
655 static struct notifier_block die_notifier = {
656         .notifier_call = hpwdt_pretimeout,
657         .priority = 0,
658 };
659 #endif /* CONFIG_HPWDT_NMI_DECODING */
660
661 /*
662  *      Init & Exit
663  */
664
665 #ifdef CONFIG_HPWDT_NMI_DECODING
666 #ifdef CONFIG_X86_LOCAL_APIC
667 static void __devinit hpwdt_check_nmi_decoding(struct pci_dev *dev)
668 {
669         /*
670          * If nmi_watchdog is turned off then we can turn on
671          * our nmi decoding capability.
672          */
673         hpwdt_nmi_decoding = 1;
674 }
675 #else
676 static void __devinit hpwdt_check_nmi_decoding(struct pci_dev *dev)
677 {
678         dev_warn(&dev->dev, "NMI decoding is disabled. "
679                 "Your kernel does not support a NMI Watchdog.\n");
680 }
681 #endif /* CONFIG_X86_LOCAL_APIC */
682
683 /*
684  *      dmi_find_icru
685  *
686  *      Routine Description:
687  *      This function checks whether or not we are on an iCRU-based server.
688  *      This check is independent of architecture and needs to be made for
689  *      any ProLiant system.
690  */
691 static void __devinit dmi_find_icru(const struct dmi_header *dm, void *dummy)
692 {
693         struct smbios_proliant_info *smbios_proliant_ptr;
694
695         if (dm->type == SMBIOS_ICRU_INFORMATION) {
696                 smbios_proliant_ptr = (struct smbios_proliant_info *) dm;
697                 if (smbios_proliant_ptr->misc_features & 0x01)
698                         is_icru = 1;
699         }
700 }
701
702 static int __devinit hpwdt_init_nmi_decoding(struct pci_dev *dev)
703 {
704         int retval;
705
706         /*
707          * On typical CRU-based systems we need to map that service in
708          * the BIOS. For 32 bit Operating Systems we need to go through
709          * the 32 Bit BIOS Service Directory. For 64 bit Operating
710          * Systems we get that service through SMBIOS.
711          *
712          * On systems that support the new iCRU service all we need to
713          * do is call dmi_walk to get the supported flag value and skip
714          * the old cru detect code.
715          */
716         dmi_walk(dmi_find_icru, NULL);
717         if (!is_icru) {
718
719                 /*
720                 * We need to map the ROM to get the CRU service.
721                 * For 32 bit Operating Systems we need to go through the 32 Bit
722                 * BIOS Service Directory
723                 * For 64 bit Operating Systems we get that service through SMBIOS.
724                 */
725                 retval = detect_cru_service();
726                 if (retval < 0) {
727                         dev_warn(&dev->dev,
728                                 "Unable to detect the %d Bit CRU Service.\n",
729                                 HPWDT_ARCH);
730                         return retval;
731                 }
732
733                 /*
734                 * We know this is the only CRU call we need to make so lets keep as
735                 * few instructions as possible once the NMI comes in.
736                 */
737                 cmn_regs.u1.rah = 0x0D;
738                 cmn_regs.u1.ral = 0x02;
739         }
740
741         /*
742          * If the priority is set to 1, then we will be put first on the
743          * die notify list to handle a critical NMI. The default is to
744          * be last so other users of the NMI signal can function.
745          */
746         if (priority)
747                 die_notifier.priority = 0x7FFFFFFF;
748
749         retval = register_die_notifier(&die_notifier);
750         if (retval != 0) {
751                 dev_warn(&dev->dev,
752                         "Unable to register a die notifier (err=%d).\n",
753                         retval);
754                 if (cru_rom_addr)
755                         iounmap(cru_rom_addr);
756         }
757
758         dev_info(&dev->dev,
759                         "HP Watchdog Timer Driver: NMI decoding initialized"
760                         ", allow kernel dump: %s (default = 0/OFF)"
761                         ", priority: %s (default = 0/LAST).\n",
762                         (allow_kdump == 0) ? "OFF" : "ON",
763                         (priority == 0) ? "LAST" : "FIRST");
764         return 0;
765 }
766
767 static void hpwdt_exit_nmi_decoding(void)
768 {
769         unregister_die_notifier(&die_notifier);
770         if (cru_rom_addr)
771                 iounmap(cru_rom_addr);
772 }
773 #else /* !CONFIG_HPWDT_NMI_DECODING */
774 static void __devinit hpwdt_check_nmi_decoding(struct pci_dev *dev)
775 {
776 }
777
778 static int __devinit hpwdt_init_nmi_decoding(struct pci_dev *dev)
779 {
780         return 0;
781 }
782
783 static void hpwdt_exit_nmi_decoding(void)
784 {
785 }
786 #endif /* CONFIG_HPWDT_NMI_DECODING */
787
788 static int __devinit hpwdt_init_one(struct pci_dev *dev,
789                                         const struct pci_device_id *ent)
790 {
791         int retval;
792
793         /*
794          * Check if we can do NMI decoding or not
795          */
796         hpwdt_check_nmi_decoding(dev);
797
798         /*
799          * First let's find out if we are on an iLO2+ server. We will
800          * not run on a legacy ASM box.
801          * So we only support the G5 ProLiant servers and higher.
802          */
803         if (dev->subsystem_vendor != PCI_VENDOR_ID_HP) {
804                 dev_warn(&dev->dev,
805                         "This server does not have an iLO2+ ASIC.\n");
806                 return -ENODEV;
807         }
808
809         if (pci_enable_device(dev)) {
810                 dev_warn(&dev->dev,
811                         "Not possible to enable PCI Device: 0x%x:0x%x.\n",
812                         ent->vendor, ent->device);
813                 return -ENODEV;
814         }
815
816         pci_mem_addr = pci_iomap(dev, 1, 0x80);
817         if (!pci_mem_addr) {
818                 dev_warn(&dev->dev,
819                         "Unable to detect the iLO2+ server memory.\n");
820                 retval = -ENOMEM;
821                 goto error_pci_iomap;
822         }
823         hpwdt_timer_reg = pci_mem_addr + 0x70;
824         hpwdt_timer_con = pci_mem_addr + 0x72;
825
826         /* Make sure that we have a valid soft_margin */
827         if (hpwdt_change_timer(soft_margin))
828                 hpwdt_change_timer(DEFAULT_MARGIN);
829
830         /* Initialize NMI Decoding functionality */
831         retval = hpwdt_init_nmi_decoding(dev);
832         if (retval != 0)
833                 goto error_init_nmi_decoding;
834
835         retval = misc_register(&hpwdt_miscdev);
836         if (retval < 0) {
837                 dev_warn(&dev->dev,
838                         "Unable to register miscdev on minor=%d (err=%d).\n",
839                         WATCHDOG_MINOR, retval);
840                 goto error_misc_register;
841         }
842
843         dev_info(&dev->dev, "HP Watchdog Timer Driver: %s"
844                         ", timer margin: %d seconds (nowayout=%d).\n",
845                         HPWDT_VERSION, soft_margin, nowayout);
846         return 0;
847
848 error_misc_register:
849         hpwdt_exit_nmi_decoding();
850 error_init_nmi_decoding:
851         pci_iounmap(dev, pci_mem_addr);
852 error_pci_iomap:
853         pci_disable_device(dev);
854         return retval;
855 }
856
857 static void __devexit hpwdt_exit(struct pci_dev *dev)
858 {
859         if (!nowayout)
860                 hpwdt_stop();
861
862         misc_deregister(&hpwdt_miscdev);
863         hpwdt_exit_nmi_decoding();
864         pci_iounmap(dev, pci_mem_addr);
865         pci_disable_device(dev);
866 }
867
868 static struct pci_driver hpwdt_driver = {
869         .name = "hpwdt",
870         .id_table = hpwdt_devices,
871         .probe = hpwdt_init_one,
872         .remove = __devexit_p(hpwdt_exit),
873 };
874
875 static void __exit hpwdt_cleanup(void)
876 {
877         pci_unregister_driver(&hpwdt_driver);
878 }
879
880 static int __init hpwdt_init(void)
881 {
882         return pci_register_driver(&hpwdt_driver);
883 }
884
885 MODULE_AUTHOR("Tom Mingarelli");
886 MODULE_DESCRIPTION("hp watchdog driver");
887 MODULE_LICENSE("GPL");
888 MODULE_VERSION(HPWDT_VERSION);
889 MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
890
891 module_param(soft_margin, int, 0);
892 MODULE_PARM_DESC(soft_margin, "Watchdog timeout in seconds");
893
894 module_param(nowayout, int, 0);
895 MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default="
896                 __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
897
898 #ifdef CONFIG_HPWDT_NMI_DECODING
899 module_param(allow_kdump, int, 0);
900 MODULE_PARM_DESC(allow_kdump, "Start a kernel dump after NMI occurs");
901
902 module_param(priority, int, 0);
903 MODULE_PARM_DESC(priority, "The hpwdt driver handles NMIs first or last"
904                 " (default = 0/Last)\n");
905 #endif /* !CONFIG_HPWDT_NMI_DECODING */
906
907 module_init(hpwdt_init);
908 module_exit(hpwdt_cleanup);