Commit | Line | Data |
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7f4da474 TM |
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> | |
7f4da474 | 42 | #include <asm/desc.h> |
7f4da474 TM |
43 | |
44 | #define PCI_BIOS32_SD_VALUE 0x5F32335F /* "_32_" */ | |
45 | #define CRU_BIOS_SIGNATURE_VALUE 0x55524324 | |
46 | #define PCI_BIOS32_PARAGRAPH_LEN 16 | |
47 | #define PCI_ROM_BASE1 0x000F0000 | |
48 | #define ROM_SIZE 0x10000 | |
49 | ||
50 | struct bios32_service_dir { | |
51 | u32 signature; | |
52 | u32 entry_point; | |
53 | u8 revision; | |
54 | u8 length; | |
55 | u8 checksum; | |
56 | u8 reserved[5]; | |
57 | }; | |
58 | ||
7f4da474 TM |
59 | /* type 212 */ |
60 | struct smbios_cru64_info { | |
61 | u8 type; | |
62 | u8 byte_length; | |
63 | u16 handle; | |
64 | u32 signature; | |
65 | u64 physical_address; | |
66 | u32 double_length; | |
67 | u32 double_offset; | |
68 | }; | |
69 | #define SMBIOS_CRU64_INFORMATION 212 | |
70 | ||
71 | struct cmn_registers { | |
72 | union { | |
73 | struct { | |
74 | u8 ral; | |
75 | u8 rah; | |
76 | u16 rea2; | |
77 | }; | |
78 | u32 reax; | |
79 | } u1; | |
80 | union { | |
81 | struct { | |
82 | u8 rbl; | |
83 | u8 rbh; | |
84 | u8 reb2l; | |
85 | u8 reb2h; | |
86 | }; | |
87 | u32 rebx; | |
88 | } u2; | |
89 | union { | |
90 | struct { | |
91 | u8 rcl; | |
92 | u8 rch; | |
93 | u16 rec2; | |
94 | }; | |
95 | u32 recx; | |
96 | } u3; | |
97 | union { | |
98 | struct { | |
99 | u8 rdl; | |
100 | u8 rdh; | |
101 | u16 red2; | |
102 | }; | |
103 | u32 redx; | |
104 | } u4; | |
105 | ||
106 | u32 resi; | |
107 | u32 redi; | |
108 | u16 rds; | |
109 | u16 res; | |
110 | u32 reflags; | |
111 | } __attribute__((packed)); | |
112 | ||
113 | #define DEFAULT_MARGIN 30 | |
114 | static unsigned int soft_margin = DEFAULT_MARGIN; /* in seconds */ | |
115 | static unsigned int reload; /* the computed soft_margin */ | |
116 | static int nowayout = WATCHDOG_NOWAYOUT; | |
117 | static char expect_release; | |
118 | static unsigned long hpwdt_is_open; | |
ab4ba3cd | 119 | static unsigned int allow_kdump; |
7f4da474 TM |
120 | |
121 | static void __iomem *pci_mem_addr; /* the PCI-memory address */ | |
122 | static unsigned long __iomem *hpwdt_timer_reg; | |
123 | static unsigned long __iomem *hpwdt_timer_con; | |
124 | ||
125 | static DEFINE_SPINLOCK(rom_lock); | |
126 | ||
127 | static void *cru_rom_addr; | |
128 | ||
129 | static struct cmn_registers cmn_regs; | |
130 | ||
131 | static struct pci_device_id hpwdt_devices[] = { | |
132 | { | |
133 | .vendor = PCI_VENDOR_ID_COMPAQ, | |
134 | .device = 0xB203, | |
135 | .subvendor = PCI_ANY_ID, | |
136 | .subdevice = PCI_ANY_ID, | |
137 | }, | |
138 | {0}, /* terminate list */ | |
139 | }; | |
140 | MODULE_DEVICE_TABLE(pci, hpwdt_devices); | |
141 | ||
1f6ef234 LT |
142 | extern asmlinkage void asminline_call(struct cmn_registers *pi86Regs, unsigned long *pRomEntry); |
143 | ||
7f4da474 TM |
144 | #ifndef CONFIG_X86_64 |
145 | /* --32 Bit Bios------------------------------------------------------------ */ | |
146 | ||
147 | #define HPWDT_ARCH 32 | |
148 | ||
1f6ef234 LT |
149 | asm(".text \n\t" |
150 | ".align 4 \n" | |
151 | "asminline_call: \n\t" | |
152 | "pushl %ebp \n\t" | |
153 | "movl %esp, %ebp \n\t" | |
154 | "pusha \n\t" | |
155 | "pushf \n\t" | |
156 | "push %es \n\t" | |
157 | "push %ds \n\t" | |
158 | "pop %es \n\t" | |
159 | "movl 8(%ebp),%eax \n\t" | |
160 | "movl 4(%eax),%ebx \n\t" | |
161 | "movl 8(%eax),%ecx \n\t" | |
162 | "movl 12(%eax),%edx \n\t" | |
163 | "movl 16(%eax),%esi \n\t" | |
164 | "movl 20(%eax),%edi \n\t" | |
165 | "movl (%eax),%eax \n\t" | |
166 | "push %cs \n\t" | |
167 | "call *12(%ebp) \n\t" | |
168 | "pushf \n\t" | |
169 | "pushl %eax \n\t" | |
170 | "movl 8(%ebp),%eax \n\t" | |
171 | "movl %ebx,4(%eax) \n\t" | |
172 | "movl %ecx,8(%eax) \n\t" | |
173 | "movl %edx,12(%eax) \n\t" | |
174 | "movl %esi,16(%eax) \n\t" | |
175 | "movl %edi,20(%eax) \n\t" | |
176 | "movw %ds,24(%eax) \n\t" | |
177 | "movw %es,26(%eax) \n\t" | |
178 | "popl %ebx \n\t" | |
179 | "movl %ebx,(%eax) \n\t" | |
180 | "popl %ebx \n\t" | |
181 | "movl %ebx,28(%eax) \n\t" | |
182 | "pop %es \n\t" | |
183 | "popf \n\t" | |
184 | "popa \n\t" | |
185 | "leave \n\t" | |
186 | "ret \n\t" | |
187 | ".previous"); | |
188 | ||
7f4da474 TM |
189 | |
190 | /* | |
191 | * cru_detect | |
192 | * | |
193 | * Routine Description: | |
194 | * This function uses the 32-bit BIOS Service Directory record to | |
195 | * search for a $CRU record. | |
196 | * | |
197 | * Return Value: | |
198 | * 0 : SUCCESS | |
199 | * <0 : FAILURE | |
200 | */ | |
201 | static int __devinit cru_detect(unsigned long map_entry, | |
202 | unsigned long map_offset) | |
203 | { | |
204 | void *bios32_map; | |
205 | unsigned long *bios32_entrypoint; | |
206 | unsigned long cru_physical_address; | |
207 | unsigned long cru_length; | |
208 | unsigned long physical_bios_base = 0; | |
209 | unsigned long physical_bios_offset = 0; | |
210 | int retval = -ENODEV; | |
211 | ||
212 | bios32_map = ioremap(map_entry, (2 * PAGE_SIZE)); | |
213 | ||
214 | if (bios32_map == NULL) | |
215 | return -ENODEV; | |
216 | ||
217 | bios32_entrypoint = bios32_map + map_offset; | |
218 | ||
219 | cmn_regs.u1.reax = CRU_BIOS_SIGNATURE_VALUE; | |
220 | ||
221 | asminline_call(&cmn_regs, bios32_entrypoint); | |
222 | ||
223 | if (cmn_regs.u1.ral != 0) { | |
224 | printk(KERN_WARNING | |
ab4ba3cd TM |
225 | "hpwdt: Call succeeded but with an error: 0x%x\n", |
226 | cmn_regs.u1.ral); | |
7f4da474 TM |
227 | } else { |
228 | physical_bios_base = cmn_regs.u2.rebx; | |
229 | physical_bios_offset = cmn_regs.u4.redx; | |
230 | cru_length = cmn_regs.u3.recx; | |
231 | cru_physical_address = | |
ab4ba3cd | 232 | physical_bios_base + physical_bios_offset; |
7f4da474 TM |
233 | |
234 | /* If the values look OK, then map it in. */ | |
235 | if ((physical_bios_base + physical_bios_offset)) { | |
236 | cru_rom_addr = | |
ab4ba3cd | 237 | ioremap(cru_physical_address, cru_length); |
7f4da474 TM |
238 | if (cru_rom_addr) |
239 | retval = 0; | |
240 | } | |
241 | ||
242 | printk(KERN_DEBUG "hpwdt: CRU Base Address: 0x%lx\n", | |
243 | physical_bios_base); | |
244 | printk(KERN_DEBUG "hpwdt: CRU Offset Address: 0x%lx\n", | |
245 | physical_bios_offset); | |
246 | printk(KERN_DEBUG "hpwdt: CRU Length: 0x%lx\n", | |
247 | cru_length); | |
248 | printk(KERN_DEBUG "hpwdt: CRU Mapped Address: 0x%x\n", | |
249 | (unsigned int)&cru_rom_addr); | |
250 | } | |
251 | iounmap(bios32_map); | |
252 | return retval; | |
253 | } | |
254 | ||
30ec910e RD |
255 | /* |
256 | * bios_checksum | |
257 | */ | |
258 | static int __devinit bios_checksum(const char __iomem *ptr, int len) | |
259 | { | |
260 | char sum = 0; | |
261 | int i; | |
262 | ||
263 | /* | |
264 | * calculate checksum of size bytes. This should add up | |
265 | * to zero if we have a valid header. | |
266 | */ | |
267 | for (i = 0; i < len; i++) | |
268 | sum += ptr[i]; | |
269 | ||
270 | return ((sum == 0) && (len > 0)); | |
271 | } | |
272 | ||
7f4da474 TM |
273 | /* |
274 | * bios32_present | |
275 | * | |
276 | * Routine Description: | |
277 | * This function finds the 32-bit BIOS Service Directory | |
278 | * | |
279 | * Return Value: | |
280 | * 0 : SUCCESS | |
281 | * <0 : FAILURE | |
282 | */ | |
283 | static int __devinit bios32_present(const char __iomem *p) | |
284 | { | |
285 | struct bios32_service_dir *bios_32_ptr; | |
286 | int length; | |
287 | unsigned long map_entry, map_offset; | |
288 | ||
289 | bios_32_ptr = (struct bios32_service_dir *) p; | |
290 | ||
291 | /* | |
292 | * Search for signature by checking equal to the swizzled value | |
293 | * instead of calling another routine to perform a strcmp. | |
294 | */ | |
295 | if (bios_32_ptr->signature == PCI_BIOS32_SD_VALUE) { | |
296 | length = bios_32_ptr->length * PCI_BIOS32_PARAGRAPH_LEN; | |
297 | if (bios_checksum(p, length)) { | |
298 | /* | |
299 | * According to the spec, we're looking for the | |
300 | * first 4KB-aligned address below the entrypoint | |
301 | * listed in the header. The Service Directory code | |
302 | * is guaranteed to occupy no more than 2 4KB pages. | |
303 | */ | |
304 | map_entry = bios_32_ptr->entry_point & ~(PAGE_SIZE - 1); | |
305 | map_offset = bios_32_ptr->entry_point - map_entry; | |
306 | ||
307 | return cru_detect(map_entry, map_offset); | |
308 | } | |
309 | } | |
310 | return -ENODEV; | |
311 | } | |
312 | ||
313 | static int __devinit detect_cru_service(void) | |
314 | { | |
315 | char __iomem *p, *q; | |
316 | int rc = -1; | |
317 | ||
318 | /* | |
319 | * Search from 0x0f0000 through 0x0fffff, inclusive. | |
320 | */ | |
321 | p = ioremap(PCI_ROM_BASE1, ROM_SIZE); | |
322 | if (p == NULL) | |
323 | return -ENOMEM; | |
324 | ||
325 | for (q = p; q < p + ROM_SIZE; q += 16) { | |
326 | rc = bios32_present(q); | |
327 | if (!rc) | |
328 | break; | |
329 | } | |
330 | iounmap(p); | |
331 | return rc; | |
332 | } | |
333 | ||
334 | #else | |
335 | /* --64 Bit Bios------------------------------------------------------------ */ | |
336 | ||
337 | #define HPWDT_ARCH 64 | |
338 | ||
1f6ef234 LT |
339 | asm(".text \n\t" |
340 | ".align 4 \n" | |
341 | "asminline_call: \n\t" | |
342 | "pushq %rbp \n\t" | |
343 | "movq %rsp, %rbp \n\t" | |
344 | "pushq %rax \n\t" | |
345 | "pushq %rbx \n\t" | |
346 | "pushq %rdx \n\t" | |
347 | "pushq %r12 \n\t" | |
348 | "pushq %r9 \n\t" | |
349 | "movq %rsi, %r12 \n\t" | |
350 | "movq %rdi, %r9 \n\t" | |
351 | "movl 4(%r9),%ebx \n\t" | |
352 | "movl 8(%r9),%ecx \n\t" | |
353 | "movl 12(%r9),%edx \n\t" | |
354 | "movl 16(%r9),%esi \n\t" | |
355 | "movl 20(%r9),%edi \n\t" | |
356 | "movl (%r9),%eax \n\t" | |
357 | "call *%r12 \n\t" | |
358 | "pushfq \n\t" | |
359 | "popq %r12 \n\t" | |
1f6ef234 LT |
360 | "movl %eax, (%r9) \n\t" |
361 | "movl %ebx, 4(%r9) \n\t" | |
362 | "movl %ecx, 8(%r9) \n\t" | |
363 | "movl %edx, 12(%r9) \n\t" | |
364 | "movl %esi, 16(%r9) \n\t" | |
365 | "movl %edi, 20(%r9) \n\t" | |
366 | "movq %r12, %rax \n\t" | |
367 | "movl %eax, 28(%r9) \n\t" | |
368 | "popq %r9 \n\t" | |
369 | "popq %r12 \n\t" | |
370 | "popq %rdx \n\t" | |
371 | "popq %rbx \n\t" | |
372 | "popq %rax \n\t" | |
373 | "leave \n\t" | |
374 | "ret \n\t" | |
375 | ".previous"); | |
7f4da474 TM |
376 | |
377 | /* | |
378 | * dmi_find_cru | |
379 | * | |
380 | * Routine Description: | |
30ec910e | 381 | * This function checks whether or not a SMBIOS/DMI record is |
7f4da474 | 382 | * the 64bit CRU info or not |
7f4da474 TM |
383 | */ |
384 | static void __devinit dmi_find_cru(const struct dmi_header *dm) | |
385 | { | |
386 | struct smbios_cru64_info *smbios_cru64_ptr; | |
387 | unsigned long cru_physical_address; | |
388 | ||
389 | if (dm->type == SMBIOS_CRU64_INFORMATION) { | |
390 | smbios_cru64_ptr = (struct smbios_cru64_info *) dm; | |
391 | if (smbios_cru64_ptr->signature == CRU_BIOS_SIGNATURE_VALUE) { | |
392 | cru_physical_address = | |
ab4ba3cd TM |
393 | smbios_cru64_ptr->physical_address + |
394 | smbios_cru64_ptr->double_offset; | |
7f4da474 | 395 | cru_rom_addr = ioremap(cru_physical_address, |
ab4ba3cd | 396 | smbios_cru64_ptr->double_length); |
7f4da474 TM |
397 | } |
398 | } | |
399 | } | |
400 | ||
7f4da474 TM |
401 | static int __devinit detect_cru_service(void) |
402 | { | |
403 | cru_rom_addr = NULL; | |
404 | ||
30ec910e | 405 | dmi_walk(dmi_find_cru); |
7f4da474 TM |
406 | |
407 | /* if cru_rom_addr has been set then we found a CRU service */ | |
ab4ba3cd | 408 | return ((cru_rom_addr != NULL) ? 0 : -ENODEV); |
7f4da474 TM |
409 | } |
410 | ||
411 | /* ------------------------------------------------------------------------- */ | |
412 | ||
413 | #endif | |
414 | ||
7f4da474 TM |
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 | ||
ab4ba3cd TM |
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_STOP; | |
486 | } | |
487 | ||
7f4da474 TM |
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; | |
7944d3a5 | 538 | if (get_user(c, data + i)) |
7f4da474 TM |
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, | |
ab4ba3cd | 630 | const struct pci_device_id *ent) |
7f4da474 TM |
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. | |
ab4ba3cd | 637 | * So we only support the G5 ProLiant servers and higher. |
7f4da474 TM |
638 | */ |
639 | if (dev->subsystem_vendor != PCI_VENDOR_ID_HP) { | |
640 | dev_warn(&dev->dev, | |
ab4ba3cd | 641 | "This server does not have an iLO2 ASIC.\n"); |
7f4da474 TM |
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, | |
ab4ba3cd | 675 | "Unable to detect the %d Bit CRU Service.\n", |
7f4da474 TM |
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, | |
ab4ba3cd | 690 | "Unable to register a die notifier (err=%d).\n", |
7f4da474 TM |
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: 1.00" | |
ab4ba3cd TM |
705 | ", timer margin: %d seconds (nowayout=%d)" |
706 | ", allow kernel dump: %s (default = 0/OFF).\n", | |
707 | soft_margin, nowayout, (allow_kdump == 0) ? "OFF" : "ON"); | |
7f4da474 TM |
708 | |
709 | return 0; | |
710 | ||
711 | error_misc_register: | |
712 | unregister_die_notifier(&die_notifier); | |
713 | error_die_notifier: | |
714 | if (cru_rom_addr) | |
715 | iounmap(cru_rom_addr); | |
716 | error_get_cru: | |
717 | pci_iounmap(dev, pci_mem_addr); | |
718 | error_pci_iomap: | |
719 | pci_disable_device(dev); | |
720 | return retval; | |
721 | } | |
722 | ||
723 | static void __devexit hpwdt_exit(struct pci_dev *dev) | |
724 | { | |
725 | if (!nowayout) | |
726 | hpwdt_stop(); | |
727 | ||
728 | misc_deregister(&hpwdt_miscdev); | |
729 | unregister_die_notifier(&die_notifier); | |
730 | ||
731 | if (cru_rom_addr) | |
732 | iounmap(cru_rom_addr); | |
733 | pci_iounmap(dev, pci_mem_addr); | |
734 | pci_disable_device(dev); | |
735 | } | |
736 | ||
737 | static struct pci_driver hpwdt_driver = { | |
738 | .name = "hpwdt", | |
739 | .id_table = hpwdt_devices, | |
740 | .probe = hpwdt_init_one, | |
741 | .remove = __devexit_p(hpwdt_exit), | |
742 | }; | |
743 | ||
744 | static void __exit hpwdt_cleanup(void) | |
745 | { | |
746 | pci_unregister_driver(&hpwdt_driver); | |
747 | } | |
748 | ||
749 | static int __init hpwdt_init(void) | |
750 | { | |
751 | return pci_register_driver(&hpwdt_driver); | |
752 | } | |
753 | ||
754 | MODULE_AUTHOR("Tom Mingarelli"); | |
755 | MODULE_DESCRIPTION("hp watchdog driver"); | |
756 | MODULE_LICENSE("GPL"); | |
757 | MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR); | |
758 | ||
759 | module_param(soft_margin, int, 0); | |
760 | MODULE_PARM_DESC(soft_margin, "Watchdog timeout in seconds"); | |
761 | ||
ab4ba3cd TM |
762 | module_param(allow_kdump, int, 0); |
763 | MODULE_PARM_DESC(allow_kdump, "Start a kernel dump after NMI occurs"); | |
764 | ||
7f4da474 TM |
765 | module_param(nowayout, int, 0); |
766 | MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=" | |
767 | __MODULE_STRING(WATCHDOG_NOWAYOUT) ")"); | |
768 | ||
769 | module_init(hpwdt_init); | |
770 | module_exit(hpwdt_cleanup); |