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Merge /spare/repo/linux-2.6/
[deliverable/linux.git] / drivers / acpi / events / evgpeblk.c
1 /******************************************************************************
2 *
3 * Module Name: evgpeblk - GPE block creation and initialization.
4 *
5 *****************************************************************************/
6
7 /*
8 * Copyright (C) 2000 - 2005, R. Byron Moore
9 * All rights reserved.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions, and the following disclaimer,
16 * without modification.
17 * 2. Redistributions in binary form must reproduce at minimum a disclaimer
18 * substantially similar to the "NO WARRANTY" disclaimer below
19 * ("Disclaimer") and any redistribution must be conditioned upon
20 * including a substantially similar Disclaimer requirement for further
21 * binary redistribution.
22 * 3. Neither the names of the above-listed copyright holders nor the names
23 * of any contributors may be used to endorse or promote products derived
24 * from this software without specific prior written permission.
25 *
26 * Alternatively, this software may be distributed under the terms of the
27 * GNU General Public License ("GPL") version 2 as published by the Free
28 * Software Foundation.
29 *
30 * NO WARRANTY
31 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
32 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
33 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
34 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
35 * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
36 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
37 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
38 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
39 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
40 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
41 * POSSIBILITY OF SUCH DAMAGES.
42 */
43
44 #include <acpi/acpi.h>
45 #include <acpi/acevents.h>
46 #include <acpi/acnamesp.h>
47
48 #define _COMPONENT ACPI_EVENTS
49 ACPI_MODULE_NAME ("evgpeblk")
50
51 /* Local prototypes */
52
53 static acpi_status
54 acpi_ev_save_method_info (
55 acpi_handle obj_handle,
56 u32 level,
57 void *obj_desc,
58 void **return_value);
59
60 static acpi_status
61 acpi_ev_match_prw_and_gpe (
62 acpi_handle obj_handle,
63 u32 level,
64 void *info,
65 void **return_value);
66
67 static struct acpi_gpe_xrupt_info *
68 acpi_ev_get_gpe_xrupt_block (
69 u32 interrupt_level);
70
71 static acpi_status
72 acpi_ev_delete_gpe_xrupt (
73 struct acpi_gpe_xrupt_info *gpe_xrupt);
74
75 static acpi_status
76 acpi_ev_install_gpe_block (
77 struct acpi_gpe_block_info *gpe_block,
78 u32 interrupt_level);
79
80 static acpi_status
81 acpi_ev_create_gpe_info_blocks (
82 struct acpi_gpe_block_info *gpe_block);
83
84
85 /*******************************************************************************
86 *
87 * FUNCTION: acpi_ev_valid_gpe_event
88 *
89 * PARAMETERS: gpe_event_info - Info for this GPE
90 *
91 * RETURN: TRUE if the gpe_event is valid
92 *
93 * DESCRIPTION: Validate a GPE event. DO NOT CALL FROM INTERRUPT LEVEL.
94 * Should be called only when the GPE lists are semaphore locked
95 * and not subject to change.
96 *
97 ******************************************************************************/
98
99 u8
100 acpi_ev_valid_gpe_event (
101 struct acpi_gpe_event_info *gpe_event_info)
102 {
103 struct acpi_gpe_xrupt_info *gpe_xrupt_block;
104 struct acpi_gpe_block_info *gpe_block;
105
106
107 ACPI_FUNCTION_ENTRY ();
108
109
110 /* No need for spin lock since we are not changing any list elements */
111
112 /* Walk the GPE interrupt levels */
113
114 gpe_xrupt_block = acpi_gbl_gpe_xrupt_list_head;
115 while (gpe_xrupt_block) {
116 gpe_block = gpe_xrupt_block->gpe_block_list_head;
117
118 /* Walk the GPE blocks on this interrupt level */
119
120 while (gpe_block) {
121 if ((&gpe_block->event_info[0] <= gpe_event_info) &&
122 (&gpe_block->event_info[((acpi_size) gpe_block->register_count) * 8] > gpe_event_info)) {
123 return (TRUE);
124 }
125
126 gpe_block = gpe_block->next;
127 }
128
129 gpe_xrupt_block = gpe_xrupt_block->next;
130 }
131
132 return (FALSE);
133 }
134
135
136 /*******************************************************************************
137 *
138 * FUNCTION: acpi_ev_walk_gpe_list
139 *
140 * PARAMETERS: gpe_walk_callback - Routine called for each GPE block
141 * Flags - ACPI_NOT_ISR or ACPI_ISR
142 *
143 * RETURN: Status
144 *
145 * DESCRIPTION: Walk the GPE lists.
146 *
147 ******************************************************************************/
148
149 acpi_status
150 acpi_ev_walk_gpe_list (
151 ACPI_GPE_CALLBACK gpe_walk_callback,
152 u32 flags)
153 {
154 struct acpi_gpe_block_info *gpe_block;
155 struct acpi_gpe_xrupt_info *gpe_xrupt_info;
156 acpi_status status = AE_OK;
157
158
159 ACPI_FUNCTION_TRACE ("ev_walk_gpe_list");
160
161
162 acpi_os_acquire_lock (acpi_gbl_gpe_lock, flags);
163
164 /* Walk the interrupt level descriptor list */
165
166 gpe_xrupt_info = acpi_gbl_gpe_xrupt_list_head;
167 while (gpe_xrupt_info) {
168 /* Walk all Gpe Blocks attached to this interrupt level */
169
170 gpe_block = gpe_xrupt_info->gpe_block_list_head;
171 while (gpe_block) {
172 /* One callback per GPE block */
173
174 status = gpe_walk_callback (gpe_xrupt_info, gpe_block);
175 if (ACPI_FAILURE (status)) {
176 goto unlock_and_exit;
177 }
178
179 gpe_block = gpe_block->next;
180 }
181
182 gpe_xrupt_info = gpe_xrupt_info->next;
183 }
184
185 unlock_and_exit:
186 acpi_os_release_lock (acpi_gbl_gpe_lock, flags);
187 return_ACPI_STATUS (status);
188 }
189
190
191 /*******************************************************************************
192 *
193 * FUNCTION: acpi_ev_delete_gpe_handlers
194 *
195 * PARAMETERS: gpe_xrupt_info - GPE Interrupt info
196 * gpe_block - Gpe Block info
197 *
198 * RETURN: Status
199 *
200 * DESCRIPTION: Delete all Handler objects found in the GPE data structs.
201 * Used only prior to termination.
202 *
203 ******************************************************************************/
204
205 acpi_status
206 acpi_ev_delete_gpe_handlers (
207 struct acpi_gpe_xrupt_info *gpe_xrupt_info,
208 struct acpi_gpe_block_info *gpe_block)
209 {
210 struct acpi_gpe_event_info *gpe_event_info;
211 acpi_native_uint i;
212 acpi_native_uint j;
213
214
215 ACPI_FUNCTION_TRACE ("ev_delete_gpe_handlers");
216
217
218 /* Examine each GPE Register within the block */
219
220 for (i = 0; i < gpe_block->register_count; i++) {
221 /* Now look at the individual GPEs in this byte register */
222
223 for (j = 0; j < ACPI_GPE_REGISTER_WIDTH; j++) {
224 gpe_event_info = &gpe_block->event_info[(i * ACPI_GPE_REGISTER_WIDTH) + j];
225
226 if ((gpe_event_info->flags & ACPI_GPE_DISPATCH_MASK) ==
227 ACPI_GPE_DISPATCH_HANDLER) {
228 ACPI_MEM_FREE (gpe_event_info->dispatch.handler);
229 gpe_event_info->dispatch.handler = NULL;
230 gpe_event_info->flags &= ~ACPI_GPE_DISPATCH_MASK;
231 }
232 }
233 }
234
235 return_ACPI_STATUS (AE_OK);
236 }
237
238
239 /*******************************************************************************
240 *
241 * FUNCTION: acpi_ev_save_method_info
242 *
243 * PARAMETERS: Callback from walk_namespace
244 *
245 * RETURN: Status
246 *
247 * DESCRIPTION: Called from acpi_walk_namespace. Expects each object to be a
248 * control method under the _GPE portion of the namespace.
249 * Extract the name and GPE type from the object, saving this
250 * information for quick lookup during GPE dispatch
251 *
252 * The name of each GPE control method is of the form:
253 * "_Lxx" or "_Exx"
254 * Where:
255 * L - means that the GPE is level triggered
256 * E - means that the GPE is edge triggered
257 * xx - is the GPE number [in HEX]
258 *
259 ******************************************************************************/
260
261 static acpi_status
262 acpi_ev_save_method_info (
263 acpi_handle obj_handle,
264 u32 level,
265 void *obj_desc,
266 void **return_value)
267 {
268 struct acpi_gpe_block_info *gpe_block = (void *) obj_desc;
269 struct acpi_gpe_event_info *gpe_event_info;
270 u32 gpe_number;
271 char name[ACPI_NAME_SIZE + 1];
272 u8 type;
273 acpi_status status;
274
275
276 ACPI_FUNCTION_TRACE ("ev_save_method_info");
277
278
279 /*
280 * _Lxx and _Exx GPE method support
281 *
282 * 1) Extract the name from the object and convert to a string
283 */
284 ACPI_MOVE_32_TO_32 (name,
285 &((struct acpi_namespace_node *) obj_handle)->name.integer);
286 name[ACPI_NAME_SIZE] = 0;
287
288 /*
289 * 2) Edge/Level determination is based on the 2nd character
290 * of the method name
291 *
292 * NOTE: Default GPE type is RUNTIME. May be changed later to WAKE
293 * if a _PRW object is found that points to this GPE.
294 */
295 switch (name[1]) {
296 case 'L':
297 type = ACPI_GPE_LEVEL_TRIGGERED;
298 break;
299
300 case 'E':
301 type = ACPI_GPE_EDGE_TRIGGERED;
302 break;
303
304 default:
305 /* Unknown method type, just ignore it! */
306
307 ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
308 "Unknown GPE method type: %s (name not of form _Lxx or _Exx)\n",
309 name));
310 return_ACPI_STATUS (AE_OK);
311 }
312
313 /* Convert the last two characters of the name to the GPE Number */
314
315 gpe_number = ACPI_STRTOUL (&name[2], NULL, 16);
316 if (gpe_number == ACPI_UINT32_MAX) {
317 /* Conversion failed; invalid method, just ignore it */
318
319 ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
320 "Could not extract GPE number from name: %s (name is not of form _Lxx or _Exx)\n",
321 name));
322 return_ACPI_STATUS (AE_OK);
323 }
324
325 /* Ensure that we have a valid GPE number for this GPE block */
326
327 if ((gpe_number < gpe_block->block_base_number) ||
328 (gpe_number >= (gpe_block->block_base_number + (gpe_block->register_count * 8)))) {
329 /*
330 * Not valid for this GPE block, just ignore it
331 * However, it may be valid for a different GPE block, since GPE0 and GPE1
332 * methods both appear under \_GPE.
333 */
334 return_ACPI_STATUS (AE_OK);
335 }
336
337 /*
338 * Now we can add this information to the gpe_event_info block
339 * for use during dispatch of this GPE. Default type is RUNTIME, although
340 * this may change when the _PRW methods are executed later.
341 */
342 gpe_event_info = &gpe_block->event_info[gpe_number - gpe_block->block_base_number];
343
344 gpe_event_info->flags = (u8) (type | ACPI_GPE_DISPATCH_METHOD |
345 ACPI_GPE_TYPE_RUNTIME);
346
347 gpe_event_info->dispatch.method_node = (struct acpi_namespace_node *) obj_handle;
348
349 /* Update enable mask, but don't enable the HW GPE as of yet */
350
351 status = acpi_ev_enable_gpe (gpe_event_info, FALSE);
352
353 ACPI_DEBUG_PRINT ((ACPI_DB_LOAD,
354 "Registered GPE method %s as GPE number 0x%.2X\n",
355 name, gpe_number));
356 return_ACPI_STATUS (status);
357 }
358
359
360 /*******************************************************************************
361 *
362 * FUNCTION: acpi_ev_match_prw_and_gpe
363 *
364 * PARAMETERS: Callback from walk_namespace
365 *
366 * RETURN: Status. NOTE: We ignore errors so that the _PRW walk is
367 * not aborted on a single _PRW failure.
368 *
369 * DESCRIPTION: Called from acpi_walk_namespace. Expects each object to be a
370 * Device. Run the _PRW method. If present, extract the GPE
371 * number and mark the GPE as a WAKE GPE.
372 *
373 ******************************************************************************/
374
375 static acpi_status
376 acpi_ev_match_prw_and_gpe (
377 acpi_handle obj_handle,
378 u32 level,
379 void *info,
380 void **return_value)
381 {
382 struct acpi_gpe_walk_info *gpe_info = (void *) info;
383 struct acpi_namespace_node *gpe_device;
384 struct acpi_gpe_block_info *gpe_block;
385 struct acpi_namespace_node *target_gpe_device;
386 struct acpi_gpe_event_info *gpe_event_info;
387 union acpi_operand_object *pkg_desc;
388 union acpi_operand_object *obj_desc;
389 u32 gpe_number;
390 acpi_status status;
391
392
393 ACPI_FUNCTION_TRACE ("ev_match_prw_and_gpe");
394
395
396 /* Check for a _PRW method under this device */
397
398 status = acpi_ut_evaluate_object (obj_handle, METHOD_NAME__PRW,
399 ACPI_BTYPE_PACKAGE, &pkg_desc);
400 if (ACPI_FAILURE (status)) {
401 /* Ignore all errors from _PRW, we don't want to abort the subsystem */
402
403 return_ACPI_STATUS (AE_OK);
404 }
405
406 /* The returned _PRW package must have at least two elements */
407
408 if (pkg_desc->package.count < 2) {
409 goto cleanup;
410 }
411
412 /* Extract pointers from the input context */
413
414 gpe_device = gpe_info->gpe_device;
415 gpe_block = gpe_info->gpe_block;
416
417 /*
418 * The _PRW object must return a package, we are only interested
419 * in the first element
420 */
421 obj_desc = pkg_desc->package.elements[0];
422
423 if (ACPI_GET_OBJECT_TYPE (obj_desc) == ACPI_TYPE_INTEGER) {
424 /* Use FADT-defined GPE device (from definition of _PRW) */
425
426 target_gpe_device = acpi_gbl_fadt_gpe_device;
427
428 /* Integer is the GPE number in the FADT described GPE blocks */
429
430 gpe_number = (u32) obj_desc->integer.value;
431 }
432 else if (ACPI_GET_OBJECT_TYPE (obj_desc) == ACPI_TYPE_PACKAGE) {
433 /* Package contains a GPE reference and GPE number within a GPE block */
434
435 if ((obj_desc->package.count < 2) ||
436 (ACPI_GET_OBJECT_TYPE (obj_desc->package.elements[0]) != ACPI_TYPE_LOCAL_REFERENCE) ||
437 (ACPI_GET_OBJECT_TYPE (obj_desc->package.elements[1]) != ACPI_TYPE_INTEGER)) {
438 goto cleanup;
439 }
440
441 /* Get GPE block reference and decode */
442
443 target_gpe_device = obj_desc->package.elements[0]->reference.node;
444 gpe_number = (u32) obj_desc->package.elements[1]->integer.value;
445 }
446 else {
447 /* Unknown type, just ignore it */
448
449 goto cleanup;
450 }
451
452 /*
453 * Is this GPE within this block?
454 *
455 * TRUE iff these conditions are true:
456 * 1) The GPE devices match.
457 * 2) The GPE index(number) is within the range of the Gpe Block
458 * associated with the GPE device.
459 */
460 if ((gpe_device == target_gpe_device) &&
461 (gpe_number >= gpe_block->block_base_number) &&
462 (gpe_number < gpe_block->block_base_number + (gpe_block->register_count * 8))) {
463 gpe_event_info = &gpe_block->event_info[gpe_number - gpe_block->block_base_number];
464
465 /* Mark GPE for WAKE-ONLY but WAKE_DISABLED */
466
467 gpe_event_info->flags &= ~(ACPI_GPE_WAKE_ENABLED | ACPI_GPE_RUN_ENABLED);
468 status = acpi_ev_set_gpe_type (gpe_event_info, ACPI_GPE_TYPE_WAKE);
469 if (ACPI_FAILURE (status)) {
470 goto cleanup;
471 }
472 status = acpi_ev_update_gpe_enable_masks (gpe_event_info, ACPI_GPE_DISABLE);
473 }
474
475 cleanup:
476 acpi_ut_remove_reference (pkg_desc);
477 return_ACPI_STATUS (AE_OK);
478 }
479
480
481 /*******************************************************************************
482 *
483 * FUNCTION: acpi_ev_get_gpe_xrupt_block
484 *
485 * PARAMETERS: interrupt_level - Interrupt for a GPE block
486 *
487 * RETURN: A GPE interrupt block
488 *
489 * DESCRIPTION: Get or Create a GPE interrupt block. There is one interrupt
490 * block per unique interrupt level used for GPEs.
491 * Should be called only when the GPE lists are semaphore locked
492 * and not subject to change.
493 *
494 ******************************************************************************/
495
496 static struct acpi_gpe_xrupt_info *
497 acpi_ev_get_gpe_xrupt_block (
498 u32 interrupt_level)
499 {
500 struct acpi_gpe_xrupt_info *next_gpe_xrupt;
501 struct acpi_gpe_xrupt_info *gpe_xrupt;
502 acpi_status status;
503
504
505 ACPI_FUNCTION_TRACE ("ev_get_gpe_xrupt_block");
506
507
508 /* No need for lock since we are not changing any list elements here */
509
510 next_gpe_xrupt = acpi_gbl_gpe_xrupt_list_head;
511 while (next_gpe_xrupt) {
512 if (next_gpe_xrupt->interrupt_level == interrupt_level) {
513 return_PTR (next_gpe_xrupt);
514 }
515
516 next_gpe_xrupt = next_gpe_xrupt->next;
517 }
518
519 /* Not found, must allocate a new xrupt descriptor */
520
521 gpe_xrupt = ACPI_MEM_CALLOCATE (sizeof (struct acpi_gpe_xrupt_info));
522 if (!gpe_xrupt) {
523 return_PTR (NULL);
524 }
525
526 gpe_xrupt->interrupt_level = interrupt_level;
527
528 /* Install new interrupt descriptor with spin lock */
529
530 acpi_os_acquire_lock (acpi_gbl_gpe_lock, ACPI_NOT_ISR);
531 if (acpi_gbl_gpe_xrupt_list_head) {
532 next_gpe_xrupt = acpi_gbl_gpe_xrupt_list_head;
533 while (next_gpe_xrupt->next) {
534 next_gpe_xrupt = next_gpe_xrupt->next;
535 }
536
537 next_gpe_xrupt->next = gpe_xrupt;
538 gpe_xrupt->previous = next_gpe_xrupt;
539 }
540 else {
541 acpi_gbl_gpe_xrupt_list_head = gpe_xrupt;
542 }
543 acpi_os_release_lock (acpi_gbl_gpe_lock, ACPI_NOT_ISR);
544
545 /* Install new interrupt handler if not SCI_INT */
546
547 if (interrupt_level != acpi_gbl_FADT->sci_int) {
548 status = acpi_os_install_interrupt_handler (interrupt_level,
549 acpi_ev_gpe_xrupt_handler, gpe_xrupt);
550 if (ACPI_FAILURE (status)) {
551 ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
552 "Could not install GPE interrupt handler at level 0x%X\n",
553 interrupt_level));
554 return_PTR (NULL);
555 }
556 }
557
558 return_PTR (gpe_xrupt);
559 }
560
561
562 /*******************************************************************************
563 *
564 * FUNCTION: acpi_ev_delete_gpe_xrupt
565 *
566 * PARAMETERS: gpe_xrupt - A GPE interrupt info block
567 *
568 * RETURN: Status
569 *
570 * DESCRIPTION: Remove and free a gpe_xrupt block. Remove an associated
571 * interrupt handler if not the SCI interrupt.
572 *
573 ******************************************************************************/
574
575 static acpi_status
576 acpi_ev_delete_gpe_xrupt (
577 struct acpi_gpe_xrupt_info *gpe_xrupt)
578 {
579 acpi_status status;
580
581
582 ACPI_FUNCTION_TRACE ("ev_delete_gpe_xrupt");
583
584
585 /* We never want to remove the SCI interrupt handler */
586
587 if (gpe_xrupt->interrupt_level == acpi_gbl_FADT->sci_int) {
588 gpe_xrupt->gpe_block_list_head = NULL;
589 return_ACPI_STATUS (AE_OK);
590 }
591
592 /* Disable this interrupt */
593
594 status = acpi_os_remove_interrupt_handler (gpe_xrupt->interrupt_level,
595 acpi_ev_gpe_xrupt_handler);
596 if (ACPI_FAILURE (status)) {
597 return_ACPI_STATUS (status);
598 }
599
600 /* Unlink the interrupt block with lock */
601
602 acpi_os_acquire_lock (acpi_gbl_gpe_lock, ACPI_NOT_ISR);
603 if (gpe_xrupt->previous) {
604 gpe_xrupt->previous->next = gpe_xrupt->next;
605 }
606
607 if (gpe_xrupt->next) {
608 gpe_xrupt->next->previous = gpe_xrupt->previous;
609 }
610 acpi_os_release_lock (acpi_gbl_gpe_lock, ACPI_NOT_ISR);
611
612 /* Free the block */
613
614 ACPI_MEM_FREE (gpe_xrupt);
615 return_ACPI_STATUS (AE_OK);
616 }
617
618
619 /*******************************************************************************
620 *
621 * FUNCTION: acpi_ev_install_gpe_block
622 *
623 * PARAMETERS: gpe_block - New GPE block
624 * interrupt_level - Level to be associated with this GPE block
625 *
626 * RETURN: Status
627 *
628 * DESCRIPTION: Install new GPE block with mutex support
629 *
630 ******************************************************************************/
631
632 static acpi_status
633 acpi_ev_install_gpe_block (
634 struct acpi_gpe_block_info *gpe_block,
635 u32 interrupt_level)
636 {
637 struct acpi_gpe_block_info *next_gpe_block;
638 struct acpi_gpe_xrupt_info *gpe_xrupt_block;
639 acpi_status status;
640
641
642 ACPI_FUNCTION_TRACE ("ev_install_gpe_block");
643
644
645 status = acpi_ut_acquire_mutex (ACPI_MTX_EVENTS);
646 if (ACPI_FAILURE (status)) {
647 return_ACPI_STATUS (status);
648 }
649
650 gpe_xrupt_block = acpi_ev_get_gpe_xrupt_block (interrupt_level);
651 if (!gpe_xrupt_block) {
652 status = AE_NO_MEMORY;
653 goto unlock_and_exit;
654 }
655
656 /* Install the new block at the end of the list with lock */
657
658 acpi_os_acquire_lock (acpi_gbl_gpe_lock, ACPI_NOT_ISR);
659 if (gpe_xrupt_block->gpe_block_list_head) {
660 next_gpe_block = gpe_xrupt_block->gpe_block_list_head;
661 while (next_gpe_block->next) {
662 next_gpe_block = next_gpe_block->next;
663 }
664
665 next_gpe_block->next = gpe_block;
666 gpe_block->previous = next_gpe_block;
667 }
668 else {
669 gpe_xrupt_block->gpe_block_list_head = gpe_block;
670 }
671
672 gpe_block->xrupt_block = gpe_xrupt_block;
673 acpi_os_release_lock (acpi_gbl_gpe_lock, ACPI_NOT_ISR);
674
675 unlock_and_exit:
676 status = acpi_ut_release_mutex (ACPI_MTX_EVENTS);
677 return_ACPI_STATUS (status);
678 }
679
680
681 /*******************************************************************************
682 *
683 * FUNCTION: acpi_ev_delete_gpe_block
684 *
685 * PARAMETERS: gpe_block - Existing GPE block
686 *
687 * RETURN: Status
688 *
689 * DESCRIPTION: Remove a GPE block
690 *
691 ******************************************************************************/
692
693 acpi_status
694 acpi_ev_delete_gpe_block (
695 struct acpi_gpe_block_info *gpe_block)
696 {
697 acpi_status status;
698
699
700 ACPI_FUNCTION_TRACE ("ev_install_gpe_block");
701
702
703 status = acpi_ut_acquire_mutex (ACPI_MTX_EVENTS);
704 if (ACPI_FAILURE (status)) {
705 return_ACPI_STATUS (status);
706 }
707
708 /* Disable all GPEs in this block */
709
710 status = acpi_hw_disable_gpe_block (gpe_block->xrupt_block, gpe_block);
711
712 if (!gpe_block->previous && !gpe_block->next) {
713 /* This is the last gpe_block on this interrupt */
714
715 status = acpi_ev_delete_gpe_xrupt (gpe_block->xrupt_block);
716 if (ACPI_FAILURE (status)) {
717 goto unlock_and_exit;
718 }
719 }
720 else {
721 /* Remove the block on this interrupt with lock */
722
723 acpi_os_acquire_lock (acpi_gbl_gpe_lock, ACPI_NOT_ISR);
724 if (gpe_block->previous) {
725 gpe_block->previous->next = gpe_block->next;
726 }
727 else {
728 gpe_block->xrupt_block->gpe_block_list_head = gpe_block->next;
729 }
730
731 if (gpe_block->next) {
732 gpe_block->next->previous = gpe_block->previous;
733 }
734 acpi_os_release_lock (acpi_gbl_gpe_lock, ACPI_NOT_ISR);
735 }
736
737 /* Free the gpe_block */
738
739 ACPI_MEM_FREE (gpe_block->register_info);
740 ACPI_MEM_FREE (gpe_block->event_info);
741 ACPI_MEM_FREE (gpe_block);
742
743 unlock_and_exit:
744 status = acpi_ut_release_mutex (ACPI_MTX_EVENTS);
745 return_ACPI_STATUS (status);
746 }
747
748
749 /*******************************************************************************
750 *
751 * FUNCTION: acpi_ev_create_gpe_info_blocks
752 *
753 * PARAMETERS: gpe_block - New GPE block
754 *
755 * RETURN: Status
756 *
757 * DESCRIPTION: Create the register_info and event_info blocks for this GPE block
758 *
759 ******************************************************************************/
760
761 static acpi_status
762 acpi_ev_create_gpe_info_blocks (
763 struct acpi_gpe_block_info *gpe_block)
764 {
765 struct acpi_gpe_register_info *gpe_register_info = NULL;
766 struct acpi_gpe_event_info *gpe_event_info = NULL;
767 struct acpi_gpe_event_info *this_event;
768 struct acpi_gpe_register_info *this_register;
769 acpi_native_uint i;
770 acpi_native_uint j;
771 acpi_status status;
772
773
774 ACPI_FUNCTION_TRACE ("ev_create_gpe_info_blocks");
775
776
777 /* Allocate the GPE register information block */
778
779 gpe_register_info = ACPI_MEM_CALLOCATE (
780 (acpi_size) gpe_block->register_count *
781 sizeof (struct acpi_gpe_register_info));
782 if (!gpe_register_info) {
783 ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
784 "Could not allocate the gpe_register_info table\n"));
785 return_ACPI_STATUS (AE_NO_MEMORY);
786 }
787
788 /*
789 * Allocate the GPE event_info block. There are eight distinct GPEs
790 * per register. Initialization to zeros is sufficient.
791 */
792 gpe_event_info = ACPI_MEM_CALLOCATE (
793 ((acpi_size) gpe_block->register_count *
794 ACPI_GPE_REGISTER_WIDTH) *
795 sizeof (struct acpi_gpe_event_info));
796 if (!gpe_event_info) {
797 ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
798 "Could not allocate the gpe_event_info table\n"));
799 status = AE_NO_MEMORY;
800 goto error_exit;
801 }
802
803 /* Save the new Info arrays in the GPE block */
804
805 gpe_block->register_info = gpe_register_info;
806 gpe_block->event_info = gpe_event_info;
807
808 /*
809 * Initialize the GPE Register and Event structures. A goal of these
810 * tables is to hide the fact that there are two separate GPE register sets
811 * in a given gpe hardware block, the status registers occupy the first half,
812 * and the enable registers occupy the second half.
813 */
814 this_register = gpe_register_info;
815 this_event = gpe_event_info;
816
817 for (i = 0; i < gpe_block->register_count; i++) {
818 /* Init the register_info for this GPE register (8 GPEs) */
819
820 this_register->base_gpe_number = (u8) (gpe_block->block_base_number +
821 (i * ACPI_GPE_REGISTER_WIDTH));
822
823 ACPI_STORE_ADDRESS (this_register->status_address.address,
824 (gpe_block->block_address.address
825 + i));
826
827 ACPI_STORE_ADDRESS (this_register->enable_address.address,
828 (gpe_block->block_address.address
829 + i
830 + gpe_block->register_count));
831
832 this_register->status_address.address_space_id = gpe_block->block_address.address_space_id;
833 this_register->enable_address.address_space_id = gpe_block->block_address.address_space_id;
834 this_register->status_address.register_bit_width = ACPI_GPE_REGISTER_WIDTH;
835 this_register->enable_address.register_bit_width = ACPI_GPE_REGISTER_WIDTH;
836 this_register->status_address.register_bit_offset = ACPI_GPE_REGISTER_WIDTH;
837 this_register->enable_address.register_bit_offset = ACPI_GPE_REGISTER_WIDTH;
838
839 /* Init the event_info for each GPE within this register */
840
841 for (j = 0; j < ACPI_GPE_REGISTER_WIDTH; j++) {
842 this_event->register_bit = acpi_gbl_decode_to8bit[j];
843 this_event->register_info = this_register;
844 this_event++;
845 }
846
847 /*
848 * Clear the status/enable registers. Note that status registers
849 * are cleared by writing a '1', while enable registers are cleared
850 * by writing a '0'.
851 */
852 status = acpi_hw_low_level_write (ACPI_GPE_REGISTER_WIDTH, 0x00,
853 &this_register->enable_address);
854 if (ACPI_FAILURE (status)) {
855 goto error_exit;
856 }
857
858 status = acpi_hw_low_level_write (ACPI_GPE_REGISTER_WIDTH, 0xFF,
859 &this_register->status_address);
860 if (ACPI_FAILURE (status)) {
861 goto error_exit;
862 }
863
864 this_register++;
865 }
866
867 return_ACPI_STATUS (AE_OK);
868
869
870 error_exit:
871 if (gpe_register_info) {
872 ACPI_MEM_FREE (gpe_register_info);
873 }
874 if (gpe_event_info) {
875 ACPI_MEM_FREE (gpe_event_info);
876 }
877
878 return_ACPI_STATUS (status);
879 }
880
881
882 /*******************************************************************************
883 *
884 * FUNCTION: acpi_ev_create_gpe_block
885 *
886 * PARAMETERS: gpe_device - Handle to the parent GPE block
887 * gpe_block_address - Address and space_iD
888 * register_count - Number of GPE register pairs in the block
889 * gpe_block_base_number - Starting GPE number for the block
890 * interrupt_level - H/W interrupt for the block
891 * return_gpe_block - Where the new block descriptor is returned
892 *
893 * RETURN: Status
894 *
895 * DESCRIPTION: Create and Install a block of GPE registers
896 *
897 ******************************************************************************/
898
899 acpi_status
900 acpi_ev_create_gpe_block (
901 struct acpi_namespace_node *gpe_device,
902 struct acpi_generic_address *gpe_block_address,
903 u32 register_count,
904 u8 gpe_block_base_number,
905 u32 interrupt_level,
906 struct acpi_gpe_block_info **return_gpe_block)
907 {
908 struct acpi_gpe_block_info *gpe_block;
909 struct acpi_gpe_event_info *gpe_event_info;
910 acpi_native_uint i;
911 acpi_native_uint j;
912 u32 wake_gpe_count;
913 u32 gpe_enabled_count;
914 acpi_status status;
915 struct acpi_gpe_walk_info gpe_info;
916
917
918 ACPI_FUNCTION_TRACE ("ev_create_gpe_block");
919
920
921 if (!register_count) {
922 return_ACPI_STATUS (AE_OK);
923 }
924
925 /* Allocate a new GPE block */
926
927 gpe_block = ACPI_MEM_CALLOCATE (sizeof (struct acpi_gpe_block_info));
928 if (!gpe_block) {
929 return_ACPI_STATUS (AE_NO_MEMORY);
930 }
931
932 /* Initialize the new GPE block */
933
934 gpe_block->register_count = register_count;
935 gpe_block->block_base_number = gpe_block_base_number;
936 gpe_block->node = gpe_device;
937
938 ACPI_MEMCPY (&gpe_block->block_address, gpe_block_address,
939 sizeof (struct acpi_generic_address));
940
941 /* Create the register_info and event_info sub-structures */
942
943 status = acpi_ev_create_gpe_info_blocks (gpe_block);
944 if (ACPI_FAILURE (status)) {
945 ACPI_MEM_FREE (gpe_block);
946 return_ACPI_STATUS (status);
947 }
948
949 /* Install the new block in the global list(s) */
950
951 status = acpi_ev_install_gpe_block (gpe_block, interrupt_level);
952 if (ACPI_FAILURE (status)) {
953 ACPI_MEM_FREE (gpe_block);
954 return_ACPI_STATUS (status);
955 }
956
957 /* Find all GPE methods (_Lxx, _Exx) for this block */
958
959 status = acpi_ns_walk_namespace (ACPI_TYPE_METHOD, gpe_device,
960 ACPI_UINT32_MAX, ACPI_NS_WALK_NO_UNLOCK, acpi_ev_save_method_info,
961 gpe_block, NULL);
962
963 /*
964 * Runtime option: Should Wake GPEs be enabled at runtime? The default
965 * is No, they should only be enabled just as the machine goes to sleep.
966 */
967 if (acpi_gbl_leave_wake_gpes_disabled) {
968 /*
969 * Differentiate RUNTIME vs WAKE GPEs, via the _PRW control methods.
970 * (Each GPE that has one or more _PRWs that reference it is by
971 * definition a WAKE GPE and will not be enabled while the machine
972 * is running.)
973 */
974 gpe_info.gpe_block = gpe_block;
975 gpe_info.gpe_device = gpe_device;
976
977 status = acpi_ns_walk_namespace (ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
978 ACPI_UINT32_MAX, ACPI_NS_WALK_UNLOCK, acpi_ev_match_prw_and_gpe,
979 &gpe_info, NULL);
980 }
981
982 /*
983 * Enable all GPEs in this block that are 1) "runtime" or "run/wake" GPEs,
984 * and 2) have a corresponding _Lxx or _Exx method. All other GPEs must
985 * be enabled via the acpi_enable_gpe() external interface.
986 */
987 wake_gpe_count = 0;
988 gpe_enabled_count = 0;
989
990 for (i = 0; i < gpe_block->register_count; i++) {
991 for (j = 0; j < 8; j++) {
992 /* Get the info block for this particular GPE */
993
994 gpe_event_info = &gpe_block->event_info[(i * ACPI_GPE_REGISTER_WIDTH) + j];
995
996 if (((gpe_event_info->flags & ACPI_GPE_DISPATCH_MASK) == ACPI_GPE_DISPATCH_METHOD) &&
997 (gpe_event_info->flags & ACPI_GPE_TYPE_RUNTIME)) {
998 gpe_enabled_count++;
999 }
1000
1001 if (gpe_event_info->flags & ACPI_GPE_TYPE_WAKE) {
1002 wake_gpe_count++;
1003 }
1004 }
1005 }
1006
1007 /* Dump info about this GPE block */
1008
1009 ACPI_DEBUG_PRINT ((ACPI_DB_INIT,
1010 "GPE %02X to %02X [%4.4s] %u regs on int 0x%X\n",
1011 (u32) gpe_block->block_base_number,
1012 (u32) (gpe_block->block_base_number +
1013 ((gpe_block->register_count * ACPI_GPE_REGISTER_WIDTH) -1)),
1014 gpe_device->name.ascii,
1015 gpe_block->register_count,
1016 interrupt_level));
1017
1018 /* Enable all valid GPEs found above */
1019
1020 status = acpi_hw_enable_runtime_gpe_block (NULL, gpe_block);
1021
1022 ACPI_DEBUG_PRINT ((ACPI_DB_INIT,
1023 "Found %u Wake, Enabled %u Runtime GPEs in this block\n",
1024 wake_gpe_count, gpe_enabled_count));
1025
1026 /* Return the new block */
1027
1028 if (return_gpe_block) {
1029 (*return_gpe_block) = gpe_block;
1030 }
1031
1032 return_ACPI_STATUS (AE_OK);
1033 }
1034
1035
1036 /*******************************************************************************
1037 *
1038 * FUNCTION: acpi_ev_gpe_initialize
1039 *
1040 * PARAMETERS: None
1041 *
1042 * RETURN: Status
1043 *
1044 * DESCRIPTION: Initialize the GPE data structures
1045 *
1046 ******************************************************************************/
1047
1048 acpi_status
1049 acpi_ev_gpe_initialize (
1050 void)
1051 {
1052 u32 register_count0 = 0;
1053 u32 register_count1 = 0;
1054 u32 gpe_number_max = 0;
1055 acpi_status status;
1056
1057
1058 ACPI_FUNCTION_TRACE ("ev_gpe_initialize");
1059
1060
1061 status = acpi_ut_acquire_mutex (ACPI_MTX_NAMESPACE);
1062 if (ACPI_FAILURE (status)) {
1063 return_ACPI_STATUS (status);
1064 }
1065
1066 /*
1067 * Initialize the GPE Block(s) defined in the FADT
1068 *
1069 * Why the GPE register block lengths are divided by 2: From the ACPI Spec,
1070 * section "General-Purpose Event Registers", we have:
1071 *
1072 * "Each register block contains two registers of equal length
1073 * GPEx_STS and GPEx_EN (where x is 0 or 1). The length of the
1074 * GPE0_STS and GPE0_EN registers is equal to half the GPE0_LEN
1075 * The length of the GPE1_STS and GPE1_EN registers is equal to
1076 * half the GPE1_LEN. If a generic register block is not supported
1077 * then its respective block pointer and block length values in the
1078 * FADT table contain zeros. The GPE0_LEN and GPE1_LEN do not need
1079 * to be the same size."
1080 */
1081
1082 /*
1083 * Determine the maximum GPE number for this machine.
1084 *
1085 * Note: both GPE0 and GPE1 are optional, and either can exist without
1086 * the other.
1087 *
1088 * If EITHER the register length OR the block address are zero, then that
1089 * particular block is not supported.
1090 */
1091 if (acpi_gbl_FADT->gpe0_blk_len &&
1092 acpi_gbl_FADT->xgpe0_blk.address) {
1093 /* GPE block 0 exists (has both length and address > 0) */
1094
1095 register_count0 = (u16) (acpi_gbl_FADT->gpe0_blk_len / 2);
1096
1097 gpe_number_max = (register_count0 * ACPI_GPE_REGISTER_WIDTH) - 1;
1098
1099 /* Install GPE Block 0 */
1100
1101 status = acpi_ev_create_gpe_block (acpi_gbl_fadt_gpe_device,
1102 &acpi_gbl_FADT->xgpe0_blk, register_count0, 0,
1103 acpi_gbl_FADT->sci_int, &acpi_gbl_gpe_fadt_blocks[0]);
1104
1105 if (ACPI_FAILURE (status)) {
1106 ACPI_REPORT_ERROR ((
1107 "Could not create GPE Block 0, %s\n",
1108 acpi_format_exception (status)));
1109 }
1110 }
1111
1112 if (acpi_gbl_FADT->gpe1_blk_len &&
1113 acpi_gbl_FADT->xgpe1_blk.address) {
1114 /* GPE block 1 exists (has both length and address > 0) */
1115
1116 register_count1 = (u16) (acpi_gbl_FADT->gpe1_blk_len / 2);
1117
1118 /* Check for GPE0/GPE1 overlap (if both banks exist) */
1119
1120 if ((register_count0) &&
1121 (gpe_number_max >= acpi_gbl_FADT->gpe1_base)) {
1122 ACPI_REPORT_ERROR ((
1123 "GPE0 block (GPE 0 to %d) overlaps the GPE1 block (GPE %d to %d) - Ignoring GPE1\n",
1124 gpe_number_max, acpi_gbl_FADT->gpe1_base,
1125 acpi_gbl_FADT->gpe1_base +
1126 ((register_count1 * ACPI_GPE_REGISTER_WIDTH) - 1)));
1127
1128 /* Ignore GPE1 block by setting the register count to zero */
1129
1130 register_count1 = 0;
1131 }
1132 else {
1133 /* Install GPE Block 1 */
1134
1135 status = acpi_ev_create_gpe_block (acpi_gbl_fadt_gpe_device,
1136 &acpi_gbl_FADT->xgpe1_blk, register_count1,
1137 acpi_gbl_FADT->gpe1_base,
1138 acpi_gbl_FADT->sci_int, &acpi_gbl_gpe_fadt_blocks[1]);
1139
1140 if (ACPI_FAILURE (status)) {
1141 ACPI_REPORT_ERROR ((
1142 "Could not create GPE Block 1, %s\n",
1143 acpi_format_exception (status)));
1144 }
1145
1146 /*
1147 * GPE0 and GPE1 do not have to be contiguous in the GPE number
1148 * space. However, GPE0 always starts at GPE number zero.
1149 */
1150 gpe_number_max = acpi_gbl_FADT->gpe1_base +
1151 ((register_count1 * ACPI_GPE_REGISTER_WIDTH) - 1);
1152 }
1153 }
1154
1155 /* Exit if there are no GPE registers */
1156
1157 if ((register_count0 + register_count1) == 0) {
1158 /* GPEs are not required by ACPI, this is OK */
1159
1160 ACPI_DEBUG_PRINT ((ACPI_DB_INIT,
1161 "There are no GPE blocks defined in the FADT\n"));
1162 status = AE_OK;
1163 goto cleanup;
1164 }
1165
1166 /* Check for Max GPE number out-of-range */
1167
1168 if (gpe_number_max > ACPI_GPE_MAX) {
1169 ACPI_REPORT_ERROR (("Maximum GPE number from FADT is too large: 0x%X\n",
1170 gpe_number_max));
1171 status = AE_BAD_VALUE;
1172 goto cleanup;
1173 }
1174
1175 cleanup:
1176 (void) acpi_ut_release_mutex (ACPI_MTX_NAMESPACE);
1177 return_ACPI_STATUS (AE_OK);
1178 }
1179
1180
Linux kernel - Deliverables
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