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[ACPI] ACPICA 20060317
[linux-2.6.git] / drivers / acpi / events / evgpeblk.c
blob4e90c1f837c3543ae7cf36c8dfb443dbe478ae57
1 /******************************************************************************
2 *
3 * Module Name: evgpeblk - GPE block creation and initialization.
4 *
5 *****************************************************************************/
6
7 /*
8 * Copyright (C) 2000 - 2006, 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 static acpi_status
53 acpi_ev_save_method_info(acpi_handle obj_handle,
54 u32 level, void *obj_desc, void **return_value);
55
56 static acpi_status
57 acpi_ev_match_prw_and_gpe(acpi_handle obj_handle,
58 u32 level, void *info, void **return_value);
59
60 static struct acpi_gpe_xrupt_info *acpi_ev_get_gpe_xrupt_block(u32
61 interrupt_number);
62
63 static acpi_status
64 acpi_ev_delete_gpe_xrupt(struct acpi_gpe_xrupt_info *gpe_xrupt);
65
66 static acpi_status
67 acpi_ev_install_gpe_block(struct acpi_gpe_block_info *gpe_block,
68 u32 interrupt_number);
69
70 static acpi_status
71 acpi_ev_create_gpe_info_blocks(struct acpi_gpe_block_info *gpe_block);
72
73 /*******************************************************************************
74 *
75 * FUNCTION: acpi_ev_valid_gpe_event
76 *
77 * PARAMETERS: gpe_event_info - Info for this GPE
78 *
79 * RETURN: TRUE if the gpe_event is valid
80 *
81 * DESCRIPTION: Validate a GPE event. DO NOT CALL FROM INTERRUPT LEVEL.
82 * Should be called only when the GPE lists are semaphore locked
83 * and not subject to change.
84 *
85 ******************************************************************************/
86
87 u8 acpi_ev_valid_gpe_event(struct acpi_gpe_event_info *gpe_event_info)
88 {
89 struct acpi_gpe_xrupt_info *gpe_xrupt_block;
90 struct acpi_gpe_block_info *gpe_block;
91
92 ACPI_FUNCTION_ENTRY();
93
94 /* No need for spin lock since we are not changing any list elements */
95
96 /* Walk the GPE interrupt levels */
97
98 gpe_xrupt_block = acpi_gbl_gpe_xrupt_list_head;
99 while (gpe_xrupt_block) {
100 gpe_block = gpe_xrupt_block->gpe_block_list_head;
101
102 /* Walk the GPE blocks on this interrupt level */
103
104 while (gpe_block) {
105 if ((&gpe_block->event_info[0] <= gpe_event_info) &&
106 (&gpe_block->
107 event_info[((acpi_size) gpe_block->
108 register_count) * 8] >
109 gpe_event_info)) {
110 return (TRUE);
111 }
112
113 gpe_block = gpe_block->next;
114 }
115
116 gpe_xrupt_block = gpe_xrupt_block->next;
117 }
118
119 return (FALSE);
120 }
121
122 /*******************************************************************************
123 *
124 * FUNCTION: acpi_ev_walk_gpe_list
125 *
126 * PARAMETERS: gpe_walk_callback - Routine called for each GPE block
127 *
128 * RETURN: Status
129 *
130 * DESCRIPTION: Walk the GPE lists.
131 *
132 ******************************************************************************/
133
134 acpi_status acpi_ev_walk_gpe_list(acpi_gpe_callback gpe_walk_callback)
135 {
136 struct acpi_gpe_block_info *gpe_block;
137 struct acpi_gpe_xrupt_info *gpe_xrupt_info;
138 acpi_status status = AE_OK;
139 acpi_cpu_flags flags;
140
141 ACPI_FUNCTION_TRACE("ev_walk_gpe_list");
142
143 flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
144
145 /* Walk the interrupt level descriptor list */
146
147 gpe_xrupt_info = acpi_gbl_gpe_xrupt_list_head;
148 while (gpe_xrupt_info) {
149
150 /* Walk all Gpe Blocks attached to this interrupt level */
151
152 gpe_block = gpe_xrupt_info->gpe_block_list_head;
153 while (gpe_block) {
154
155 /* One callback per GPE block */
156
157 status = gpe_walk_callback(gpe_xrupt_info, gpe_block);
158 if (ACPI_FAILURE(status)) {
159 goto unlock_and_exit;
160 }
161
162 gpe_block = gpe_block->next;
163 }
164
165 gpe_xrupt_info = gpe_xrupt_info->next;
166 }
167
168 unlock_and_exit:
169 acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
170 return_ACPI_STATUS(status);
171 }
172
173 /*******************************************************************************
174 *
175 * FUNCTION: acpi_ev_delete_gpe_handlers
176 *
177 * PARAMETERS: gpe_xrupt_info - GPE Interrupt info
178 * gpe_block - Gpe Block info
179 *
180 * RETURN: Status
181 *
182 * DESCRIPTION: Delete all Handler objects found in the GPE data structs.
183 * Used only prior to termination.
184 *
185 ******************************************************************************/
186
187 acpi_status
188 acpi_ev_delete_gpe_handlers(struct acpi_gpe_xrupt_info *gpe_xrupt_info,
189 struct acpi_gpe_block_info *gpe_block)
190 {
191 struct acpi_gpe_event_info *gpe_event_info;
192 acpi_native_uint i;
193 acpi_native_uint j;
194
195 ACPI_FUNCTION_TRACE("ev_delete_gpe_handlers");
196
197 /* Examine each GPE Register within the block */
198
199 for (i = 0; i < gpe_block->register_count; i++) {
200
201 /* Now look at the individual GPEs in this byte register */
202
203 for (j = 0; j < ACPI_GPE_REGISTER_WIDTH; j++) {
204 gpe_event_info =
205 &gpe_block->
206 event_info[(i * ACPI_GPE_REGISTER_WIDTH) + j];
207
208 if ((gpe_event_info->flags & ACPI_GPE_DISPATCH_MASK) ==
209 ACPI_GPE_DISPATCH_HANDLER) {
210 ACPI_FREE(gpe_event_info->dispatch.handler);
211 gpe_event_info->dispatch.handler = NULL;
212 gpe_event_info->flags &=
213 ~ACPI_GPE_DISPATCH_MASK;
214 }
215 }
216 }
217
218 return_ACPI_STATUS(AE_OK);
219 }
220
221 /*******************************************************************************
222 *
223 * FUNCTION: acpi_ev_save_method_info
224 *
225 * PARAMETERS: Callback from walk_namespace
226 *
227 * RETURN: Status
228 *
229 * DESCRIPTION: Called from acpi_walk_namespace. Expects each object to be a
230 * control method under the _GPE portion of the namespace.
231 * Extract the name and GPE type from the object, saving this
232 * information for quick lookup during GPE dispatch
233 *
234 * The name of each GPE control method is of the form:
235 * "_Lxx" or "_Exx"
236 * Where:
237 * L - means that the GPE is level triggered
238 * E - means that the GPE is edge triggered
239 * xx - is the GPE number [in HEX]
240 *
241 ******************************************************************************/
242
243 static acpi_status
244 acpi_ev_save_method_info(acpi_handle obj_handle,
245 u32 level, void *obj_desc, void **return_value)
246 {
247 struct acpi_gpe_block_info *gpe_block = (void *)obj_desc;
248 struct acpi_gpe_event_info *gpe_event_info;
249 u32 gpe_number;
250 char name[ACPI_NAME_SIZE + 1];
251 u8 type;
252 acpi_status status;
253
254 ACPI_FUNCTION_TRACE("ev_save_method_info");
255
256 /*
257 * _Lxx and _Exx GPE method support
258 *
259 * 1) Extract the name from the object and convert to a string
260 */
261 ACPI_MOVE_32_TO_32(name,
262 &((struct acpi_namespace_node *)obj_handle)->name.
263 integer);
264 name[ACPI_NAME_SIZE] = 0;
265
266 /*
267 * 2) Edge/Level determination is based on the 2nd character
268 * of the method name
269 *
270 * NOTE: Default GPE type is RUNTIME. May be changed later to WAKE
271 * if a _PRW object is found that points to this GPE.
272 */
273 switch (name[1]) {
274 case 'L':
275 type = ACPI_GPE_LEVEL_TRIGGERED;
276 break;
277
278 case 'E':
279 type = ACPI_GPE_EDGE_TRIGGERED;
280 break;
281
282 default:
283 /* Unknown method type, just ignore it! */
284
285 ACPI_ERROR((AE_INFO,
286 "Unknown GPE method type: %s (name not of form _Lxx or _Exx)",
287 name));
288 return_ACPI_STATUS(AE_OK);
289 }
290
291 /* Convert the last two characters of the name to the GPE Number */
292
293 gpe_number = ACPI_STRTOUL(&name[2], NULL, 16);
294 if (gpe_number == ACPI_UINT32_MAX) {
295
296 /* Conversion failed; invalid method, just ignore it */
297
298 ACPI_ERROR((AE_INFO,
299 "Could not extract GPE number from name: %s (name is not of form _Lxx or _Exx)",
300 name));
301 return_ACPI_STATUS(AE_OK);
302 }
303
304 /* Ensure that we have a valid GPE number for this GPE block */
305
306 if ((gpe_number < gpe_block->block_base_number) ||
307 (gpe_number >=
308 (gpe_block->block_base_number +
309 (gpe_block->register_count * 8)))) {
310 /*
311 * Not valid for this GPE block, just ignore it
312 * However, it may be valid for a different GPE block, since GPE0 and GPE1
313 * methods both appear under \_GPE.
314 */
315 return_ACPI_STATUS(AE_OK);
316 }
317
318 /*
319 * Now we can add this information to the gpe_event_info block
320 * for use during dispatch of this GPE. Default type is RUNTIME, although
321 * this may change when the _PRW methods are executed later.
322 */
323 gpe_event_info =
324 &gpe_block->event_info[gpe_number - gpe_block->block_base_number];
325
326 gpe_event_info->flags = (u8)
327 (type | ACPI_GPE_DISPATCH_METHOD | ACPI_GPE_TYPE_RUNTIME);
328
329 gpe_event_info->dispatch.method_node =
330 (struct acpi_namespace_node *)obj_handle;
331
332 /* Update enable mask, but don't enable the HW GPE as of yet */
333
334 status = acpi_ev_enable_gpe(gpe_event_info, FALSE);
335
336 ACPI_DEBUG_PRINT((ACPI_DB_LOAD,
337 "Registered GPE method %s as GPE number 0x%.2X\n",
338 name, gpe_number));
339 return_ACPI_STATUS(status);
340 }
341
342 /*******************************************************************************
343 *
344 * FUNCTION: acpi_ev_match_prw_and_gpe
345 *
346 * PARAMETERS: Callback from walk_namespace
347 *
348 * RETURN: Status. NOTE: We ignore errors so that the _PRW walk is
349 * not aborted on a single _PRW failure.
350 *
351 * DESCRIPTION: Called from acpi_walk_namespace. Expects each object to be a
352 * Device. Run the _PRW method. If present, extract the GPE
353 * number and mark the GPE as a WAKE GPE.
354 *
355 ******************************************************************************/
356
357 static acpi_status
358 acpi_ev_match_prw_and_gpe(acpi_handle obj_handle,
359 u32 level, void *info, void **return_value)
360 {
361 struct acpi_gpe_walk_info *gpe_info = (void *)info;
362 struct acpi_namespace_node *gpe_device;
363 struct acpi_gpe_block_info *gpe_block;
364 struct acpi_namespace_node *target_gpe_device;
365 struct acpi_gpe_event_info *gpe_event_info;
366 union acpi_operand_object *pkg_desc;
367 union acpi_operand_object *obj_desc;
368 u32 gpe_number;
369 acpi_status status;
370
371 ACPI_FUNCTION_TRACE("ev_match_prw_and_gpe");
372
373 /* Check for a _PRW method under this device */
374
375 status = acpi_ut_evaluate_object(obj_handle, METHOD_NAME__PRW,
376 ACPI_BTYPE_PACKAGE, &pkg_desc);
377 if (ACPI_FAILURE(status)) {
378
379 /* Ignore all errors from _PRW, we don't want to abort the subsystem */
380
381 return_ACPI_STATUS(AE_OK);
382 }
383
384 /* The returned _PRW package must have at least two elements */
385
386 if (pkg_desc->package.count < 2) {
387 goto cleanup;
388 }
389
390 /* Extract pointers from the input context */
391
392 gpe_device = gpe_info->gpe_device;
393 gpe_block = gpe_info->gpe_block;
394
395 /*
396 * The _PRW object must return a package, we are only interested
397 * in the first element
398 */
399 obj_desc = pkg_desc->package.elements[0];
400
401 if (ACPI_GET_OBJECT_TYPE(obj_desc) == ACPI_TYPE_INTEGER) {
402
403 /* Use FADT-defined GPE device (from definition of _PRW) */
404
405 target_gpe_device = acpi_gbl_fadt_gpe_device;
406
407 /* Integer is the GPE number in the FADT described GPE blocks */
408
409 gpe_number = (u32) obj_desc->integer.value;
410 } else if (ACPI_GET_OBJECT_TYPE(obj_desc) == ACPI_TYPE_PACKAGE) {
411
412 /* Package contains a GPE reference and GPE number within a GPE block */
413
414 if ((obj_desc->package.count < 2) ||
415 (ACPI_GET_OBJECT_TYPE(obj_desc->package.elements[0]) !=
416 ACPI_TYPE_LOCAL_REFERENCE)
417 || (ACPI_GET_OBJECT_TYPE(obj_desc->package.elements[1]) !=
418 ACPI_TYPE_INTEGER)) {
419 goto cleanup;
420 }
421
422 /* Get GPE block reference and decode */
423
424 target_gpe_device =
425 obj_desc->package.elements[0]->reference.node;
426 gpe_number = (u32) obj_desc->package.elements[1]->integer.value;
427 } else {
428 /* Unknown type, just ignore it */
429
430 goto cleanup;
431 }
432
433 /*
434 * Is this GPE within this block?
435 *
436 * TRUE iff these conditions are true:
437 * 1) The GPE devices match.
438 * 2) The GPE index(number) is within the range of the Gpe Block
439 * associated with the GPE device.
440 */
441 if ((gpe_device == target_gpe_device) &&
442 (gpe_number >= gpe_block->block_base_number) &&
443 (gpe_number <
444 gpe_block->block_base_number + (gpe_block->register_count * 8))) {
445 gpe_event_info =
446 &gpe_block->event_info[gpe_number -
447 gpe_block->block_base_number];
448
449 /* Mark GPE for WAKE-ONLY but WAKE_DISABLED */
450
451 gpe_event_info->flags &=
452 ~(ACPI_GPE_WAKE_ENABLED | ACPI_GPE_RUN_ENABLED);
453
454 status =
455 acpi_ev_set_gpe_type(gpe_event_info, ACPI_GPE_TYPE_WAKE);
456 if (ACPI_FAILURE(status)) {
457 goto cleanup;
458 }
459 status =
460 acpi_ev_update_gpe_enable_masks(gpe_event_info,
461 ACPI_GPE_DISABLE);
462 }
463
464 cleanup:
465 acpi_ut_remove_reference(pkg_desc);
466 return_ACPI_STATUS(AE_OK);
467 }
468
469 /*******************************************************************************
470 *
471 * FUNCTION: acpi_ev_get_gpe_xrupt_block
472 *
473 * PARAMETERS: interrupt_number - Interrupt for a GPE block
474 *
475 * RETURN: A GPE interrupt block
476 *
477 * DESCRIPTION: Get or Create a GPE interrupt block. There is one interrupt
478 * block per unique interrupt level used for GPEs.
479 * Should be called only when the GPE lists are semaphore locked
480 * and not subject to change.
481 *
482 ******************************************************************************/
483
484 static struct acpi_gpe_xrupt_info *acpi_ev_get_gpe_xrupt_block(u32
485 interrupt_number)
486 {
487 struct acpi_gpe_xrupt_info *next_gpe_xrupt;
488 struct acpi_gpe_xrupt_info *gpe_xrupt;
489 acpi_status status;
490 acpi_cpu_flags flags;
491
492 ACPI_FUNCTION_TRACE("ev_get_gpe_xrupt_block");
493
494 /* No need for lock since we are not changing any list elements here */
495
496 next_gpe_xrupt = acpi_gbl_gpe_xrupt_list_head;
497 while (next_gpe_xrupt) {
498 if (next_gpe_xrupt->interrupt_number == interrupt_number) {
499 return_PTR(next_gpe_xrupt);
500 }
501
502 next_gpe_xrupt = next_gpe_xrupt->next;
503 }
504
505 /* Not found, must allocate a new xrupt descriptor */
506
507 gpe_xrupt = ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_gpe_xrupt_info));
508 if (!gpe_xrupt) {
509 return_PTR(NULL);
510 }
511
512 gpe_xrupt->interrupt_number = interrupt_number;
513
514 /* Install new interrupt descriptor with spin lock */
515
516 flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
517 if (acpi_gbl_gpe_xrupt_list_head) {
518 next_gpe_xrupt = acpi_gbl_gpe_xrupt_list_head;
519 while (next_gpe_xrupt->next) {
520 next_gpe_xrupt = next_gpe_xrupt->next;
521 }
522
523 next_gpe_xrupt->next = gpe_xrupt;
524 gpe_xrupt->previous = next_gpe_xrupt;
525 } else {
526 acpi_gbl_gpe_xrupt_list_head = gpe_xrupt;
527 }
528 acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
529
530 /* Install new interrupt handler if not SCI_INT */
531
532 if (interrupt_number != acpi_gbl_FADT->sci_int) {
533 status = acpi_os_install_interrupt_handler(interrupt_number,
534 acpi_ev_gpe_xrupt_handler,
535 gpe_xrupt);
536 if (ACPI_FAILURE(status)) {
537 ACPI_ERROR((AE_INFO,
538 "Could not install GPE interrupt handler at level 0x%X",
539 interrupt_number));
540 return_PTR(NULL);
541 }
542 }
543
544 return_PTR(gpe_xrupt);
545 }
546
547 /*******************************************************************************
548 *
549 * FUNCTION: acpi_ev_delete_gpe_xrupt
550 *
551 * PARAMETERS: gpe_xrupt - A GPE interrupt info block
552 *
553 * RETURN: Status
554 *
555 * DESCRIPTION: Remove and free a gpe_xrupt block. Remove an associated
556 * interrupt handler if not the SCI interrupt.
557 *
558 ******************************************************************************/
559
560 static acpi_status
561 acpi_ev_delete_gpe_xrupt(struct acpi_gpe_xrupt_info *gpe_xrupt)
562 {
563 acpi_status status;
564 acpi_cpu_flags flags;
565
566 ACPI_FUNCTION_TRACE("ev_delete_gpe_xrupt");
567
568 /* We never want to remove the SCI interrupt handler */
569
570 if (gpe_xrupt->interrupt_number == acpi_gbl_FADT->sci_int) {
571 gpe_xrupt->gpe_block_list_head = NULL;
572 return_ACPI_STATUS(AE_OK);
573 }
574
575 /* Disable this interrupt */
576
577 status =
578 acpi_os_remove_interrupt_handler(gpe_xrupt->interrupt_number,
579 acpi_ev_gpe_xrupt_handler);
580 if (ACPI_FAILURE(status)) {
581 return_ACPI_STATUS(status);
582 }
583
584 /* Unlink the interrupt block with lock */
585
586 flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
587 if (gpe_xrupt->previous) {
588 gpe_xrupt->previous->next = gpe_xrupt->next;
589 }
590
591 if (gpe_xrupt->next) {
592 gpe_xrupt->next->previous = gpe_xrupt->previous;
593 }
594 acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
595
596 /* Free the block */
597
598 ACPI_FREE(gpe_xrupt);
599 return_ACPI_STATUS(AE_OK);
600 }
601
602 /*******************************************************************************
603 *
604 * FUNCTION: acpi_ev_install_gpe_block
605 *
606 * PARAMETERS: gpe_block - New GPE block
607 * interrupt_number - Xrupt to be associated with this GPE block
608 *
609 * RETURN: Status
610 *
611 * DESCRIPTION: Install new GPE block with mutex support
612 *
613 ******************************************************************************/
614
615 static acpi_status
616 acpi_ev_install_gpe_block(struct acpi_gpe_block_info *gpe_block,
617 u32 interrupt_number)
618 {
619 struct acpi_gpe_block_info *next_gpe_block;
620 struct acpi_gpe_xrupt_info *gpe_xrupt_block;
621 acpi_status status;
622 acpi_cpu_flags flags;
623
624 ACPI_FUNCTION_TRACE("ev_install_gpe_block");
625
626 status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
627 if (ACPI_FAILURE(status)) {
628 return_ACPI_STATUS(status);
629 }
630
631 gpe_xrupt_block = acpi_ev_get_gpe_xrupt_block(interrupt_number);
632 if (!gpe_xrupt_block) {
633 status = AE_NO_MEMORY;
634 goto unlock_and_exit;
635 }
636
637 /* Install the new block at the end of the list with lock */
638
639 flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
640 if (gpe_xrupt_block->gpe_block_list_head) {
641 next_gpe_block = gpe_xrupt_block->gpe_block_list_head;
642 while (next_gpe_block->next) {
643 next_gpe_block = next_gpe_block->next;
644 }
645
646 next_gpe_block->next = gpe_block;
647 gpe_block->previous = next_gpe_block;
648 } else {
649 gpe_xrupt_block->gpe_block_list_head = gpe_block;
650 }
651
652 gpe_block->xrupt_block = gpe_xrupt_block;
653 acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
654
655 unlock_and_exit:
656 status = acpi_ut_release_mutex(ACPI_MTX_EVENTS);
657 return_ACPI_STATUS(status);
658 }
659
660 /*******************************************************************************
661 *
662 * FUNCTION: acpi_ev_delete_gpe_block
663 *
664 * PARAMETERS: gpe_block - Existing GPE block
665 *
666 * RETURN: Status
667 *
668 * DESCRIPTION: Remove a GPE block
669 *
670 ******************************************************************************/
671
672 acpi_status acpi_ev_delete_gpe_block(struct acpi_gpe_block_info *gpe_block)
673 {
674 acpi_status status;
675 acpi_cpu_flags flags;
676
677 ACPI_FUNCTION_TRACE("ev_install_gpe_block");
678
679 status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
680 if (ACPI_FAILURE(status)) {
681 return_ACPI_STATUS(status);
682 }
683
684 /* Disable all GPEs in this block */
685
686 status = acpi_hw_disable_gpe_block(gpe_block->xrupt_block, gpe_block);
687
688 if (!gpe_block->previous && !gpe_block->next) {
689
690 /* This is the last gpe_block on this interrupt */
691
692 status = acpi_ev_delete_gpe_xrupt(gpe_block->xrupt_block);
693 if (ACPI_FAILURE(status)) {
694 goto unlock_and_exit;
695 }
696 } else {
697 /* Remove the block on this interrupt with lock */
698
699 flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
700 if (gpe_block->previous) {
701 gpe_block->previous->next = gpe_block->next;
702 } else {
703 gpe_block->xrupt_block->gpe_block_list_head =
704 gpe_block->next;
705 }
706
707 if (gpe_block->next) {
708 gpe_block->next->previous = gpe_block->previous;
709 }
710 acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
711 }
712
713 /* Free the gpe_block */
714
715 ACPI_FREE(gpe_block->register_info);
716 ACPI_FREE(gpe_block->event_info);
717 ACPI_FREE(gpe_block);
718
719 unlock_and_exit:
720 status = acpi_ut_release_mutex(ACPI_MTX_EVENTS);
721 return_ACPI_STATUS(status);
722 }
723
724 /*******************************************************************************
725 *
726 * FUNCTION: acpi_ev_create_gpe_info_blocks
727 *
728 * PARAMETERS: gpe_block - New GPE block
729 *
730 * RETURN: Status
731 *
732 * DESCRIPTION: Create the register_info and event_info blocks for this GPE block
733 *
734 ******************************************************************************/
735
736 static acpi_status
737 acpi_ev_create_gpe_info_blocks(struct acpi_gpe_block_info *gpe_block)
738 {
739 struct acpi_gpe_register_info *gpe_register_info = NULL;
740 struct acpi_gpe_event_info *gpe_event_info = NULL;
741 struct acpi_gpe_event_info *this_event;
742 struct acpi_gpe_register_info *this_register;
743 acpi_native_uint i;
744 acpi_native_uint j;
745 acpi_status status;
746
747 ACPI_FUNCTION_TRACE("ev_create_gpe_info_blocks");
748
749 /* Allocate the GPE register information block */
750
751 gpe_register_info = ACPI_ALLOCATE_ZEROED((acpi_size) gpe_block->
752 register_count *
753 sizeof(struct
754 acpi_gpe_register_info));
755 if (!gpe_register_info) {
756 ACPI_ERROR((AE_INFO,
757 "Could not allocate the gpe_register_info table"));
758 return_ACPI_STATUS(AE_NO_MEMORY);
759 }
760
761 /*
762 * Allocate the GPE event_info block. There are eight distinct GPEs
763 * per register. Initialization to zeros is sufficient.
764 */
765 gpe_event_info = ACPI_ALLOCATE_ZEROED(((acpi_size) gpe_block->
766 register_count *
767 ACPI_GPE_REGISTER_WIDTH) *
768 sizeof(struct
769 acpi_gpe_event_info));
770 if (!gpe_event_info) {
771 ACPI_ERROR((AE_INFO,
772 "Could not allocate the gpe_event_info table"));
773 status = AE_NO_MEMORY;
774 goto error_exit;
775 }
776
777 /* Save the new Info arrays in the GPE block */
778
779 gpe_block->register_info = gpe_register_info;
780 gpe_block->event_info = gpe_event_info;
781
782 /*
783 * Initialize the GPE Register and Event structures. A goal of these
784 * tables is to hide the fact that there are two separate GPE register sets
785 * in a given GPE hardware block, the status registers occupy the first half,
786 * and the enable registers occupy the second half.
787 */
788 this_register = gpe_register_info;
789 this_event = gpe_event_info;
790
791 for (i = 0; i < gpe_block->register_count; i++) {
792
793 /* Init the register_info for this GPE register (8 GPEs) */
794
795 this_register->base_gpe_number =
796 (u8) (gpe_block->block_base_number +
797 (i * ACPI_GPE_REGISTER_WIDTH));
798
799 ACPI_STORE_ADDRESS(this_register->status_address.address,
800 (gpe_block->block_address.address + i));
801
802 ACPI_STORE_ADDRESS(this_register->enable_address.address,
803 (gpe_block->block_address.address
804 + i + gpe_block->register_count));
805
806 this_register->status_address.address_space_id =
807 gpe_block->block_address.address_space_id;
808 this_register->enable_address.address_space_id =
809 gpe_block->block_address.address_space_id;
810 this_register->status_address.register_bit_width =
811 ACPI_GPE_REGISTER_WIDTH;
812 this_register->enable_address.register_bit_width =
813 ACPI_GPE_REGISTER_WIDTH;
814 this_register->status_address.register_bit_offset =
815 ACPI_GPE_REGISTER_WIDTH;
816 this_register->enable_address.register_bit_offset =
817 ACPI_GPE_REGISTER_WIDTH;
818
819 /* Init the event_info for each GPE within this register */
820
821 for (j = 0; j < ACPI_GPE_REGISTER_WIDTH; j++) {
822 this_event->register_bit = acpi_gbl_decode_to8bit[j];
823 this_event->register_info = this_register;
824 this_event++;
825 }
826
827 /* Disable all GPEs within this register */
828
829 status = acpi_hw_low_level_write(ACPI_GPE_REGISTER_WIDTH, 0x00,
830 &this_register->
831 enable_address);
832 if (ACPI_FAILURE(status)) {
833 goto error_exit;
834 }
835
836 /* Clear any pending GPE events within this register */
837
838 status = acpi_hw_low_level_write(ACPI_GPE_REGISTER_WIDTH, 0xFF,
839 &this_register->
840 status_address);
841 if (ACPI_FAILURE(status)) {
842 goto error_exit;
843 }
844
845 this_register++;
846 }
847
848 return_ACPI_STATUS(AE_OK);
849
850 error_exit:
851 if (gpe_register_info) {
852 ACPI_FREE(gpe_register_info);
853 }
854 if (gpe_event_info) {
855 ACPI_FREE(gpe_event_info);
856 }
857
858 return_ACPI_STATUS(status);
859 }
860
861 /*******************************************************************************
862 *
863 * FUNCTION: acpi_ev_create_gpe_block
864 *
865 * PARAMETERS: gpe_device - Handle to the parent GPE block
866 * gpe_block_address - Address and space_iD
867 * register_count - Number of GPE register pairs in the block
868 * gpe_block_base_number - Starting GPE number for the block
869 * interrupt_number - H/W interrupt for the block
870 * return_gpe_block - Where the new block descriptor is returned
871 *
872 * RETURN: Status
873 *
874 * DESCRIPTION: Create and Install a block of GPE registers. All GPEs within
875 * the block are disabled at exit.
876 * Note: Assumes namespace is locked.
877 *
878 ******************************************************************************/
879
880 acpi_status
881 acpi_ev_create_gpe_block(struct acpi_namespace_node *gpe_device,
882 struct acpi_generic_address *gpe_block_address,
883 u32 register_count,
884 u8 gpe_block_base_number,
885 u32 interrupt_number,
886 struct acpi_gpe_block_info **return_gpe_block)
887 {
888 acpi_status status;
889 struct acpi_gpe_block_info *gpe_block;
890
891 ACPI_FUNCTION_TRACE("ev_create_gpe_block");
892
893 if (!register_count) {
894 return_ACPI_STATUS(AE_OK);
895 }
896
897 /* Allocate a new GPE block */
898
899 gpe_block = ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_gpe_block_info));
900 if (!gpe_block) {
901 return_ACPI_STATUS(AE_NO_MEMORY);
902 }
903
904 /* Initialize the new GPE block */
905
906 gpe_block->node = gpe_device;
907 gpe_block->register_count = register_count;
908 gpe_block->block_base_number = gpe_block_base_number;
909
910 ACPI_MEMCPY(&gpe_block->block_address, gpe_block_address,
911 sizeof(struct acpi_generic_address));
912
913 /*
914 * Create the register_info and event_info sub-structures
915 * Note: disables and clears all GPEs in the block
916 */
917 status = acpi_ev_create_gpe_info_blocks(gpe_block);
918 if (ACPI_FAILURE(status)) {
919 ACPI_FREE(gpe_block);
920 return_ACPI_STATUS(status);
921 }
922
923 /* Install the new block in the global lists */
924
925 status = acpi_ev_install_gpe_block(gpe_block, interrupt_number);
926 if (ACPI_FAILURE(status)) {
927 ACPI_FREE(gpe_block);
928 return_ACPI_STATUS(status);
929 }
930
931 /* Find all GPE methods (_Lxx, _Exx) for this block */
932
933 status = acpi_ns_walk_namespace(ACPI_TYPE_METHOD, gpe_device,
934 ACPI_UINT32_MAX, ACPI_NS_WALK_NO_UNLOCK,
935 acpi_ev_save_method_info, gpe_block,
936 NULL);
937
938 /* Return the new block */
939
940 if (return_gpe_block) {
941 (*return_gpe_block) = gpe_block;
942 }
943
944 ACPI_DEBUG_PRINT((ACPI_DB_INIT,
945 "GPE %02X to %02X [%4.4s] %u regs on int 0x%X\n",
946 (u32) gpe_block->block_base_number,
947 (u32) (gpe_block->block_base_number +
948 ((gpe_block->register_count *
949 ACPI_GPE_REGISTER_WIDTH) - 1)),
950 gpe_device->name.ascii, gpe_block->register_count,
951 interrupt_number));
952
953 return_ACPI_STATUS(AE_OK);
954 }
955
956 /*******************************************************************************
957 *
958 * FUNCTION: acpi_ev_initialize_gpe_block
959 *
960 * PARAMETERS: gpe_device - Handle to the parent GPE block
961 * gpe_block - Gpe Block info
962 *
963 * RETURN: Status
964 *
965 * DESCRIPTION: Initialize and enable a GPE block. First find and run any
966 * _PRT methods associated with the block, then enable the
967 * appropriate GPEs.
968 * Note: Assumes namespace is locked.
969 *
970 ******************************************************************************/
971
972 acpi_status
973 acpi_ev_initialize_gpe_block(struct acpi_namespace_node *gpe_device,
974 struct acpi_gpe_block_info *gpe_block)
975 {
976 acpi_status status;
977 struct acpi_gpe_event_info *gpe_event_info;
978 struct acpi_gpe_walk_info gpe_info;
979 u32 wake_gpe_count;
980 u32 gpe_enabled_count;
981 acpi_native_uint i;
982 acpi_native_uint j;
983
984 ACPI_FUNCTION_TRACE("ev_initialize_gpe_block");
985
986 /* Ignore a null GPE block (e.g., if no GPE block 1 exists) */
987
988 if (!gpe_block) {
989 return_ACPI_STATUS(AE_OK);
990 }
991
992 /*
993 * Runtime option: Should wake GPEs be enabled at runtime? The default
994 * is no, they should only be enabled just as the machine goes to sleep.
995 */
996 if (acpi_gbl_leave_wake_gpes_disabled) {
997 /*
998 * Differentiate runtime vs wake GPEs, via the _PRW control methods.
999 * Each GPE that has one or more _PRWs that reference it is by
1000 * definition a wake GPE and will not be enabled while the machine
1001 * is running.
1002 */
1003 gpe_info.gpe_block = gpe_block;
1004 gpe_info.gpe_device = gpe_device;
1005
1006 status =
1007 acpi_ns_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
1008 ACPI_UINT32_MAX, ACPI_NS_WALK_UNLOCK,
1009 acpi_ev_match_prw_and_gpe, &gpe_info,
1010 NULL);
1011 }
1012
1013 /*
1014 * Enable all GPEs in this block that have these attributes:
1015 * 1) are "runtime" or "run/wake" GPEs, and
1016 * 2) have a corresponding _Lxx or _Exx method
1017 *
1018 * Any other GPEs within this block must be enabled via the acpi_enable_gpe()
1019 * external interface.
1020 */
1021 wake_gpe_count = 0;
1022 gpe_enabled_count = 0;
1023
1024 for (i = 0; i < gpe_block->register_count; i++) {
1025 for (j = 0; j < 8; j++) {
1026
1027 /* Get the info block for this particular GPE */
1028
1029 gpe_event_info =
1030 &gpe_block->
1031 event_info[(i * ACPI_GPE_REGISTER_WIDTH) + j];
1032
1033 if (((gpe_event_info->flags & ACPI_GPE_DISPATCH_MASK) ==
1034 ACPI_GPE_DISPATCH_METHOD)
1035 && (gpe_event_info->
1036 flags & ACPI_GPE_TYPE_RUNTIME)) {
1037 gpe_enabled_count++;
1038 }
1039
1040 if (gpe_event_info->flags & ACPI_GPE_TYPE_WAKE) {
1041 wake_gpe_count++;
1042 }
1043 }
1044 }
1045
1046 ACPI_DEBUG_PRINT((ACPI_DB_INIT,
1047 "Found %u Wake, Enabled %u Runtime GPEs in this block\n",
1048 wake_gpe_count, gpe_enabled_count));
1049
1050 /* Enable all valid runtime GPEs found above */
1051
1052 status = acpi_hw_enable_runtime_gpe_block(NULL, gpe_block);
1053 if (ACPI_FAILURE(status)) {
1054 ACPI_ERROR((AE_INFO, "Could not enable GPEs in gpe_block %p",
1055 gpe_block));
1056 }
1057
1058 return_ACPI_STATUS(status);
1059 }
1060
1061 /*******************************************************************************
1062 *
1063 * FUNCTION: acpi_ev_gpe_initialize
1064 *
1065 * PARAMETERS: None
1066 *
1067 * RETURN: Status
1068 *
1069 * DESCRIPTION: Initialize the GPE data structures
1070 *
1071 ******************************************************************************/
1072
1073 acpi_status acpi_ev_gpe_initialize(void)
1074 {
1075 u32 register_count0 = 0;
1076 u32 register_count1 = 0;
1077 u32 gpe_number_max = 0;
1078 acpi_status status;
1079
1080 ACPI_FUNCTION_TRACE("ev_gpe_initialize");
1081
1082 status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
1083 if (ACPI_FAILURE(status)) {
1084 return_ACPI_STATUS(status);
1085 }
1086
1087 /*
1088 * Initialize the GPE Block(s) defined in the FADT
1089 *
1090 * Why the GPE register block lengths are divided by 2: From the ACPI Spec,
1091 * section "General-Purpose Event Registers", we have:
1092 *
1093 * "Each register block contains two registers of equal length
1094 * GPEx_STS and GPEx_EN (where x is 0 or 1). The length of the
1095 * GPE0_STS and GPE0_EN registers is equal to half the GPE0_LEN
1096 * The length of the GPE1_STS and GPE1_EN registers is equal to
1097 * half the GPE1_LEN. If a generic register block is not supported
1098 * then its respective block pointer and block length values in the
1099 * FADT table contain zeros. The GPE0_LEN and GPE1_LEN do not need
1100 * to be the same size."
1101 */
1102
1103 /*
1104 * Determine the maximum GPE number for this machine.
1105 *
1106 * Note: both GPE0 and GPE1 are optional, and either can exist without
1107 * the other.
1108 *
1109 * If EITHER the register length OR the block address are zero, then that
1110 * particular block is not supported.
1111 */
1112 if (acpi_gbl_FADT->gpe0_blk_len && acpi_gbl_FADT->xgpe0_blk.address) {
1113
1114 /* GPE block 0 exists (has both length and address > 0) */
1115
1116 register_count0 = (u16) (acpi_gbl_FADT->gpe0_blk_len / 2);
1117
1118 gpe_number_max =
1119 (register_count0 * ACPI_GPE_REGISTER_WIDTH) - 1;
1120
1121 /* Install GPE Block 0 */
1122
1123 status = acpi_ev_create_gpe_block(acpi_gbl_fadt_gpe_device,
1124 &acpi_gbl_FADT->xgpe0_blk,
1125 register_count0, 0,
1126 acpi_gbl_FADT->sci_int,
1127 &acpi_gbl_gpe_fadt_blocks[0]);
1128
1129 if (ACPI_FAILURE(status)) {
1130 ACPI_EXCEPTION((AE_INFO, status,
1131 "Could not create GPE Block 0"));
1132 }
1133 }
1134
1135 if (acpi_gbl_FADT->gpe1_blk_len && acpi_gbl_FADT->xgpe1_blk.address) {
1136
1137 /* GPE block 1 exists (has both length and address > 0) */
1138
1139 register_count1 = (u16) (acpi_gbl_FADT->gpe1_blk_len / 2);
1140
1141 /* Check for GPE0/GPE1 overlap (if both banks exist) */
1142
1143 if ((register_count0) &&
1144 (gpe_number_max >= acpi_gbl_FADT->gpe1_base)) {
1145 ACPI_ERROR((AE_INFO,
1146 "GPE0 block (GPE 0 to %d) overlaps the GPE1 block (GPE %d to %d) - Ignoring GPE1",
1147 gpe_number_max, acpi_gbl_FADT->gpe1_base,
1148 acpi_gbl_FADT->gpe1_base +
1149 ((register_count1 *
1150 ACPI_GPE_REGISTER_WIDTH) - 1)));
1151
1152 /* Ignore GPE1 block by setting the register count to zero */
1153
1154 register_count1 = 0;
1155 } else {
1156 /* Install GPE Block 1 */
1157
1158 status =
1159 acpi_ev_create_gpe_block(acpi_gbl_fadt_gpe_device,
1160 &acpi_gbl_FADT->xgpe1_blk,
1161 register_count1,
1162 acpi_gbl_FADT->gpe1_base,
1163 acpi_gbl_FADT->sci_int,
1164 &acpi_gbl_gpe_fadt_blocks
1165 [1]);
1166
1167 if (ACPI_FAILURE(status)) {
1168 ACPI_EXCEPTION((AE_INFO, status,
1169 "Could not create GPE Block 1"));
1170 }
1171
1172 /*
1173 * GPE0 and GPE1 do not have to be contiguous in the GPE number
1174 * space. However, GPE0 always starts at GPE number zero.
1175 */
1176 gpe_number_max = acpi_gbl_FADT->gpe1_base +
1177 ((register_count1 * ACPI_GPE_REGISTER_WIDTH) - 1);
1178 }
1179 }
1180
1181 /* Exit if there are no GPE registers */
1182
1183 if ((register_count0 + register_count1) == 0) {
1184
1185 /* GPEs are not required by ACPI, this is OK */
1186
1187 ACPI_DEBUG_PRINT((ACPI_DB_INIT,
1188 "There are no GPE blocks defined in the FADT\n"));
1189 status = AE_OK;
1190 goto cleanup;
1191 }
1192
1193 /* Check for Max GPE number out-of-range */
1194
1195 if (gpe_number_max > ACPI_GPE_MAX) {
1196 ACPI_ERROR((AE_INFO,
1197 "Maximum GPE number from FADT is too large: 0x%X",
1198 gpe_number_max));
1199 status = AE_BAD_VALUE;
1200 goto cleanup;
1201 }
1202
1203 cleanup:
1204 (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
1205 return_ACPI_STATUS(AE_OK);
1206 }
Linus' kernel tree