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