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[GitHub/mt8127/android_kernel_alcatel_ttab.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 - 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_native_uint 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_REPORT_ERROR(("Unknown GPE method type: %s (name not of form _Lxx or _Exx)\n", name));
283 return_ACPI_STATUS(AE_OK);
284 }
285
286 /* Convert the last two characters of the name to the GPE Number */
287
288 gpe_number = ACPI_STRTOUL(&name[2], NULL, 16);
289 if (gpe_number == ACPI_UINT32_MAX) {
290 /* Conversion failed; invalid method, just ignore it */
291
292 ACPI_REPORT_ERROR(("Could not extract GPE number from name: %s (name is not of form _Lxx or _Exx)\n", name));
293 return_ACPI_STATUS(AE_OK);
294 }
295
296 /* Ensure that we have a valid GPE number for this GPE block */
297
298 if ((gpe_number < gpe_block->block_base_number) ||
299 (gpe_number >=
300 (gpe_block->block_base_number +
301 (gpe_block->register_count * 8)))) {
302 /*
303 * Not valid for this GPE block, just ignore it
304 * However, it may be valid for a different GPE block, since GPE0 and GPE1
305 * methods both appear under \_GPE.
306 */
307 return_ACPI_STATUS(AE_OK);
308 }
309
310 /*
311 * Now we can add this information to the gpe_event_info block
312 * for use during dispatch of this GPE. Default type is RUNTIME, although
313 * this may change when the _PRW methods are executed later.
314 */
315 gpe_event_info =
316 &gpe_block->event_info[gpe_number - gpe_block->block_base_number];
317
318 gpe_event_info->flags = (u8)
319 (type | ACPI_GPE_DISPATCH_METHOD | ACPI_GPE_TYPE_RUNTIME);
320
321 gpe_event_info->dispatch.method_node =
322 (struct acpi_namespace_node *)obj_handle;
323
324 /* Update enable mask, but don't enable the HW GPE as of yet */
325
326 status = acpi_ev_enable_gpe(gpe_event_info, FALSE);
327
328 ACPI_DEBUG_PRINT((ACPI_DB_LOAD,
329 "Registered GPE method %s as GPE number 0x%.2X\n",
330 name, gpe_number));
331 return_ACPI_STATUS(status);
332 }
333
334 /*******************************************************************************
335 *
336 * FUNCTION: acpi_ev_match_prw_and_gpe
337 *
338 * PARAMETERS: Callback from walk_namespace
339 *
340 * RETURN: Status. NOTE: We ignore errors so that the _PRW walk is
341 * not aborted on a single _PRW failure.
342 *
343 * DESCRIPTION: Called from acpi_walk_namespace. Expects each object to be a
344 * Device. Run the _PRW method. If present, extract the GPE
345 * number and mark the GPE as a WAKE GPE.
346 *
347 ******************************************************************************/
348
349 static acpi_status
350 acpi_ev_match_prw_and_gpe(acpi_handle obj_handle,
351 u32 level, void *info, void **return_value)
352 {
353 struct acpi_gpe_walk_info *gpe_info = (void *)info;
354 struct acpi_namespace_node *gpe_device;
355 struct acpi_gpe_block_info *gpe_block;
356 struct acpi_namespace_node *target_gpe_device;
357 struct acpi_gpe_event_info *gpe_event_info;
358 union acpi_operand_object *pkg_desc;
359 union acpi_operand_object *obj_desc;
360 u32 gpe_number;
361 acpi_status status;
362
363 ACPI_FUNCTION_TRACE("ev_match_prw_and_gpe");
364
365 /* Check for a _PRW method under this device */
366
367 status = acpi_ut_evaluate_object(obj_handle, METHOD_NAME__PRW,
368 ACPI_BTYPE_PACKAGE, &pkg_desc);
369 if (ACPI_FAILURE(status)) {
370 /* Ignore all errors from _PRW, we don't want to abort the subsystem */
371
372 return_ACPI_STATUS(AE_OK);
373 }
374
375 /* The returned _PRW package must have at least two elements */
376
377 if (pkg_desc->package.count < 2) {
378 goto cleanup;
379 }
380
381 /* Extract pointers from the input context */
382
383 gpe_device = gpe_info->gpe_device;
384 gpe_block = gpe_info->gpe_block;
385
386 /*
387 * The _PRW object must return a package, we are only interested
388 * in the first element
389 */
390 obj_desc = pkg_desc->package.elements[0];
391
392 if (ACPI_GET_OBJECT_TYPE(obj_desc) == ACPI_TYPE_INTEGER) {
393 /* Use FADT-defined GPE device (from definition of _PRW) */
394
395 target_gpe_device = acpi_gbl_fadt_gpe_device;
396
397 /* Integer is the GPE number in the FADT described GPE blocks */
398
399 gpe_number = (u32) obj_desc->integer.value;
400 } else if (ACPI_GET_OBJECT_TYPE(obj_desc) == ACPI_TYPE_PACKAGE) {
401 /* Package contains a GPE reference and GPE number within a GPE block */
402
403 if ((obj_desc->package.count < 2) ||
404 (ACPI_GET_OBJECT_TYPE(obj_desc->package.elements[0]) !=
405 ACPI_TYPE_LOCAL_REFERENCE)
406 || (ACPI_GET_OBJECT_TYPE(obj_desc->package.elements[1]) !=
407 ACPI_TYPE_INTEGER)) {
408 goto cleanup;
409 }
410
411 /* Get GPE block reference and decode */
412
413 target_gpe_device =
414 obj_desc->package.elements[0]->reference.node;
415 gpe_number = (u32) obj_desc->package.elements[1]->integer.value;
416 } else {
417 /* Unknown type, just ignore it */
418
419 goto cleanup;
420 }
421
422 /*
423 * Is this GPE within this block?
424 *
425 * TRUE iff these conditions are true:
426 * 1) The GPE devices match.
427 * 2) The GPE index(number) is within the range of the Gpe Block
428 * associated with the GPE device.
429 */
430 if ((gpe_device == target_gpe_device) &&
431 (gpe_number >= gpe_block->block_base_number) &&
432 (gpe_number <
433 gpe_block->block_base_number + (gpe_block->register_count * 8))) {
434 gpe_event_info =
435 &gpe_block->event_info[gpe_number -
436 gpe_block->block_base_number];
437
438 /* Mark GPE for WAKE-ONLY but WAKE_DISABLED */
439
440 gpe_event_info->flags &=
441 ~(ACPI_GPE_WAKE_ENABLED | ACPI_GPE_RUN_ENABLED);
442
443 status =
444 acpi_ev_set_gpe_type(gpe_event_info, ACPI_GPE_TYPE_WAKE);
445 if (ACPI_FAILURE(status)) {
446 goto cleanup;
447 }
448 status =
449 acpi_ev_update_gpe_enable_masks(gpe_event_info,
450 ACPI_GPE_DISABLE);
451 }
452
453 cleanup:
454 acpi_ut_remove_reference(pkg_desc);
455 return_ACPI_STATUS(AE_OK);
456 }
457
458 /*******************************************************************************
459 *
460 * FUNCTION: acpi_ev_get_gpe_xrupt_block
461 *
462 * PARAMETERS: interrupt_number - Interrupt for a GPE block
463 *
464 * RETURN: A GPE interrupt block
465 *
466 * DESCRIPTION: Get or Create a GPE interrupt block. There is one interrupt
467 * block per unique interrupt level used for GPEs.
468 * Should be called only when the GPE lists are semaphore locked
469 * and not subject to change.
470 *
471 ******************************************************************************/
472
473 static struct acpi_gpe_xrupt_info *acpi_ev_get_gpe_xrupt_block(u32
474 interrupt_number)
475 {
476 struct acpi_gpe_xrupt_info *next_gpe_xrupt;
477 struct acpi_gpe_xrupt_info *gpe_xrupt;
478 acpi_status status;
479 acpi_native_uint flags;
480
481 ACPI_FUNCTION_TRACE("ev_get_gpe_xrupt_block");
482
483 /* No need for lock since we are not changing any list elements here */
484
485 next_gpe_xrupt = acpi_gbl_gpe_xrupt_list_head;
486 while (next_gpe_xrupt) {
487 if (next_gpe_xrupt->interrupt_number == interrupt_number) {
488 return_PTR(next_gpe_xrupt);
489 }
490
491 next_gpe_xrupt = next_gpe_xrupt->next;
492 }
493
494 /* Not found, must allocate a new xrupt descriptor */
495
496 gpe_xrupt = ACPI_MEM_CALLOCATE(sizeof(struct acpi_gpe_xrupt_info));
497 if (!gpe_xrupt) {
498 return_PTR(NULL);
499 }
500
501 gpe_xrupt->interrupt_number = interrupt_number;
502
503 /* Install new interrupt descriptor with spin lock */
504
505 flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
506 if (acpi_gbl_gpe_xrupt_list_head) {
507 next_gpe_xrupt = acpi_gbl_gpe_xrupt_list_head;
508 while (next_gpe_xrupt->next) {
509 next_gpe_xrupt = next_gpe_xrupt->next;
510 }
511
512 next_gpe_xrupt->next = gpe_xrupt;
513 gpe_xrupt->previous = next_gpe_xrupt;
514 } else {
515 acpi_gbl_gpe_xrupt_list_head = gpe_xrupt;
516 }
517 acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
518
519 /* Install new interrupt handler if not SCI_INT */
520
521 if (interrupt_number != acpi_gbl_FADT->sci_int) {
522 status = acpi_os_install_interrupt_handler(interrupt_number,
523 acpi_ev_gpe_xrupt_handler,
524 gpe_xrupt);
525 if (ACPI_FAILURE(status)) {
526 ACPI_REPORT_ERROR(("Could not install GPE interrupt handler at level 0x%X\n", interrupt_number));
527 return_PTR(NULL);
528 }
529 }
530
531 return_PTR(gpe_xrupt);
532 }
533
534 /*******************************************************************************
535 *
536 * FUNCTION: acpi_ev_delete_gpe_xrupt
537 *
538 * PARAMETERS: gpe_xrupt - A GPE interrupt info block
539 *
540 * RETURN: Status
541 *
542 * DESCRIPTION: Remove and free a gpe_xrupt block. Remove an associated
543 * interrupt handler if not the SCI interrupt.
544 *
545 ******************************************************************************/
546
547 static acpi_status
548 acpi_ev_delete_gpe_xrupt(struct acpi_gpe_xrupt_info *gpe_xrupt)
549 {
550 acpi_status status;
551 acpi_native_uint flags;
552
553 ACPI_FUNCTION_TRACE("ev_delete_gpe_xrupt");
554
555 /* We never want to remove the SCI interrupt handler */
556
557 if (gpe_xrupt->interrupt_number == acpi_gbl_FADT->sci_int) {
558 gpe_xrupt->gpe_block_list_head = NULL;
559 return_ACPI_STATUS(AE_OK);
560 }
561
562 /* Disable this interrupt */
563
564 status =
565 acpi_os_remove_interrupt_handler(gpe_xrupt->interrupt_number,
566 acpi_ev_gpe_xrupt_handler);
567 if (ACPI_FAILURE(status)) {
568 return_ACPI_STATUS(status);
569 }
570
571 /* Unlink the interrupt block with lock */
572
573 flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
574 if (gpe_xrupt->previous) {
575 gpe_xrupt->previous->next = gpe_xrupt->next;
576 }
577
578 if (gpe_xrupt->next) {
579 gpe_xrupt->next->previous = gpe_xrupt->previous;
580 }
581 acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
582
583 /* Free the block */
584
585 ACPI_MEM_FREE(gpe_xrupt);
586 return_ACPI_STATUS(AE_OK);
587 }
588
589 /*******************************************************************************
590 *
591 * FUNCTION: acpi_ev_install_gpe_block
592 *
593 * PARAMETERS: gpe_block - New GPE block
594 * interrupt_number - Xrupt to be associated with this GPE block
595 *
596 * RETURN: Status
597 *
598 * DESCRIPTION: Install new GPE block with mutex support
599 *
600 ******************************************************************************/
601
602 static acpi_status
603 acpi_ev_install_gpe_block(struct acpi_gpe_block_info *gpe_block,
604 u32 interrupt_number)
605 {
606 struct acpi_gpe_block_info *next_gpe_block;
607 struct acpi_gpe_xrupt_info *gpe_xrupt_block;
608 acpi_status status;
609 acpi_native_uint flags;
610
611 ACPI_FUNCTION_TRACE("ev_install_gpe_block");
612
613 status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
614 if (ACPI_FAILURE(status)) {
615 return_ACPI_STATUS(status);
616 }
617
618 gpe_xrupt_block = acpi_ev_get_gpe_xrupt_block(interrupt_number);
619 if (!gpe_xrupt_block) {
620 status = AE_NO_MEMORY;
621 goto unlock_and_exit;
622 }
623
624 /* Install the new block at the end of the list with lock */
625
626 flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
627 if (gpe_xrupt_block->gpe_block_list_head) {
628 next_gpe_block = gpe_xrupt_block->gpe_block_list_head;
629 while (next_gpe_block->next) {
630 next_gpe_block = next_gpe_block->next;
631 }
632
633 next_gpe_block->next = gpe_block;
634 gpe_block->previous = next_gpe_block;
635 } else {
636 gpe_xrupt_block->gpe_block_list_head = gpe_block;
637 }
638
639 gpe_block->xrupt_block = gpe_xrupt_block;
640 acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
641
642 unlock_and_exit:
643 status = acpi_ut_release_mutex(ACPI_MTX_EVENTS);
644 return_ACPI_STATUS(status);
645 }
646
647 /*******************************************************************************
648 *
649 * FUNCTION: acpi_ev_delete_gpe_block
650 *
651 * PARAMETERS: gpe_block - Existing GPE block
652 *
653 * RETURN: Status
654 *
655 * DESCRIPTION: Remove a GPE block
656 *
657 ******************************************************************************/
658
659 acpi_status acpi_ev_delete_gpe_block(struct acpi_gpe_block_info *gpe_block)
660 {
661 acpi_status status;
662 acpi_native_uint flags;
663
664 ACPI_FUNCTION_TRACE("ev_install_gpe_block");
665
666 status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
667 if (ACPI_FAILURE(status)) {
668 return_ACPI_STATUS(status);
669 }
670
671 /* Disable all GPEs in this block */
672
673 status = acpi_hw_disable_gpe_block(gpe_block->xrupt_block, gpe_block);
674
675 if (!gpe_block->previous && !gpe_block->next) {
676 /* This is the last gpe_block on this interrupt */
677
678 status = acpi_ev_delete_gpe_xrupt(gpe_block->xrupt_block);
679 if (ACPI_FAILURE(status)) {
680 goto unlock_and_exit;
681 }
682 } else {
683 /* Remove the block on this interrupt with lock */
684
685 flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
686 if (gpe_block->previous) {
687 gpe_block->previous->next = gpe_block->next;
688 } else {
689 gpe_block->xrupt_block->gpe_block_list_head =
690 gpe_block->next;
691 }
692
693 if (gpe_block->next) {
694 gpe_block->next->previous = gpe_block->previous;
695 }
696 acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
697 }
698
699 /* Free the gpe_block */
700
701 ACPI_MEM_FREE(gpe_block->register_info);
702 ACPI_MEM_FREE(gpe_block->event_info);
703 ACPI_MEM_FREE(gpe_block);
704
705 unlock_and_exit:
706 status = acpi_ut_release_mutex(ACPI_MTX_EVENTS);
707 return_ACPI_STATUS(status);
708 }
709
710 /*******************************************************************************
711 *
712 * FUNCTION: acpi_ev_create_gpe_info_blocks
713 *
714 * PARAMETERS: gpe_block - New GPE block
715 *
716 * RETURN: Status
717 *
718 * DESCRIPTION: Create the register_info and event_info blocks for this GPE block
719 *
720 ******************************************************************************/
721
722 static acpi_status
723 acpi_ev_create_gpe_info_blocks(struct acpi_gpe_block_info *gpe_block)
724 {
725 struct acpi_gpe_register_info *gpe_register_info = NULL;
726 struct acpi_gpe_event_info *gpe_event_info = NULL;
727 struct acpi_gpe_event_info *this_event;
728 struct acpi_gpe_register_info *this_register;
729 acpi_native_uint i;
730 acpi_native_uint j;
731 acpi_status status;
732
733 ACPI_FUNCTION_TRACE("ev_create_gpe_info_blocks");
734
735 /* Allocate the GPE register information block */
736
737 gpe_register_info = ACPI_MEM_CALLOCATE((acpi_size) gpe_block->
738 register_count *
739 sizeof(struct
740 acpi_gpe_register_info));
741 if (!gpe_register_info) {
742 ACPI_REPORT_ERROR(("Could not allocate the gpe_register_info table\n"));
743 return_ACPI_STATUS(AE_NO_MEMORY);
744 }
745
746 /*
747 * Allocate the GPE event_info block. There are eight distinct GPEs
748 * per register. Initialization to zeros is sufficient.
749 */
750 gpe_event_info = ACPI_MEM_CALLOCATE(((acpi_size) gpe_block->
751 register_count *
752 ACPI_GPE_REGISTER_WIDTH) *
753 sizeof(struct acpi_gpe_event_info));
754 if (!gpe_event_info) {
755 ACPI_REPORT_ERROR(("Could not allocate the gpe_event_info table\n"));
756 status = AE_NO_MEMORY;
757 goto error_exit;
758 }
759
760 /* Save the new Info arrays in the GPE block */
761
762 gpe_block->register_info = gpe_register_info;
763 gpe_block->event_info = gpe_event_info;
764
765 /*
766 * Initialize the GPE Register and Event structures. A goal of these
767 * tables is to hide the fact that there are two separate GPE register sets
768 * in a given GPE hardware block, the status registers occupy the first half,
769 * and the enable registers occupy the second half.
770 */
771 this_register = gpe_register_info;
772 this_event = gpe_event_info;
773
774 for (i = 0; i < gpe_block->register_count; i++) {
775 /* Init the register_info for this GPE register (8 GPEs) */
776
777 this_register->base_gpe_number =
778 (u8) (gpe_block->block_base_number +
779 (i * ACPI_GPE_REGISTER_WIDTH));
780
781 ACPI_STORE_ADDRESS(this_register->status_address.address,
782 (gpe_block->block_address.address + i));
783
784 ACPI_STORE_ADDRESS(this_register->enable_address.address,
785 (gpe_block->block_address.address
786 + i + gpe_block->register_count));
787
788 this_register->status_address.address_space_id =
789 gpe_block->block_address.address_space_id;
790 this_register->enable_address.address_space_id =
791 gpe_block->block_address.address_space_id;
792 this_register->status_address.register_bit_width =
793 ACPI_GPE_REGISTER_WIDTH;
794 this_register->enable_address.register_bit_width =
795 ACPI_GPE_REGISTER_WIDTH;
796 this_register->status_address.register_bit_offset =
797 ACPI_GPE_REGISTER_WIDTH;
798 this_register->enable_address.register_bit_offset =
799 ACPI_GPE_REGISTER_WIDTH;
800
801 /* Init the event_info for each GPE within this register */
802
803 for (j = 0; j < ACPI_GPE_REGISTER_WIDTH; j++) {
804 this_event->register_bit = acpi_gbl_decode_to8bit[j];
805 this_event->register_info = this_register;
806 this_event++;
807 }
808
809 /* Disable all GPEs within this register */
810
811 status = acpi_hw_low_level_write(ACPI_GPE_REGISTER_WIDTH, 0x00,
812 &this_register->
813 enable_address);
814 if (ACPI_FAILURE(status)) {
815 goto error_exit;
816 }
817
818 /* Clear any pending GPE events within this register */
819
820 status = acpi_hw_low_level_write(ACPI_GPE_REGISTER_WIDTH, 0xFF,
821 &this_register->
822 status_address);
823 if (ACPI_FAILURE(status)) {
824 goto error_exit;
825 }
826
827 this_register++;
828 }
829
830 return_ACPI_STATUS(AE_OK);
831
832 error_exit:
833 if (gpe_register_info) {
834 ACPI_MEM_FREE(gpe_register_info);
835 }
836 if (gpe_event_info) {
837 ACPI_MEM_FREE(gpe_event_info);
838 }
839
840 return_ACPI_STATUS(status);
841 }
842
843 /*******************************************************************************
844 *
845 * FUNCTION: acpi_ev_create_gpe_block
846 *
847 * PARAMETERS: gpe_device - Handle to the parent GPE block
848 * gpe_block_address - Address and space_iD
849 * register_count - Number of GPE register pairs in the block
850 * gpe_block_base_number - Starting GPE number for the block
851 * interrupt_number - H/W interrupt for the block
852 * return_gpe_block - Where the new block descriptor is returned
853 *
854 * RETURN: Status
855 *
856 * DESCRIPTION: Create and Install a block of GPE registers. All GPEs within
857 * the block are disabled at exit.
858 * Note: Assumes namespace is locked.
859 *
860 ******************************************************************************/
861
862 acpi_status
863 acpi_ev_create_gpe_block(struct acpi_namespace_node *gpe_device,
864 struct acpi_generic_address *gpe_block_address,
865 u32 register_count,
866 u8 gpe_block_base_number,
867 u32 interrupt_number,
868 struct acpi_gpe_block_info **return_gpe_block)
869 {
870 acpi_status status;
871 struct acpi_gpe_block_info *gpe_block;
872
873 ACPI_FUNCTION_TRACE("ev_create_gpe_block");
874
875 if (!register_count) {
876 return_ACPI_STATUS(AE_OK);
877 }
878
879 /* Allocate a new GPE block */
880
881 gpe_block = ACPI_MEM_CALLOCATE(sizeof(struct acpi_gpe_block_info));
882 if (!gpe_block) {
883 return_ACPI_STATUS(AE_NO_MEMORY);
884 }
885
886 /* Initialize the new GPE block */
887
888 gpe_block->node = gpe_device;
889 gpe_block->register_count = register_count;
890 gpe_block->block_base_number = gpe_block_base_number;
891
892 ACPI_MEMCPY(&gpe_block->block_address, gpe_block_address,
893 sizeof(struct acpi_generic_address));
894
895 /*
896 * Create the register_info and event_info sub-structures
897 * Note: disables and clears all GPEs in the block
898 */
899 status = acpi_ev_create_gpe_info_blocks(gpe_block);
900 if (ACPI_FAILURE(status)) {
901 ACPI_MEM_FREE(gpe_block);
902 return_ACPI_STATUS(status);
903 }
904
905 /* Install the new block in the global lists */
906
907 status = acpi_ev_install_gpe_block(gpe_block, interrupt_number);
908 if (ACPI_FAILURE(status)) {
909 ACPI_MEM_FREE(gpe_block);
910 return_ACPI_STATUS(status);
911 }
912
913 /* Find all GPE methods (_Lxx, _Exx) for this block */
914
915 status = acpi_ns_walk_namespace(ACPI_TYPE_METHOD, gpe_device,
916 ACPI_UINT32_MAX, ACPI_NS_WALK_NO_UNLOCK,
917 acpi_ev_save_method_info, gpe_block,
918 NULL);
919
920 /* Return the new block */
921
922 if (return_gpe_block) {
923 (*return_gpe_block) = gpe_block;
924 }
925
926 ACPI_DEBUG_PRINT((ACPI_DB_INIT,
927 "GPE %02X to %02X [%4.4s] %u regs on int 0x%X\n",
928 (u32) gpe_block->block_base_number,
929 (u32) (gpe_block->block_base_number +
930 ((gpe_block->register_count *
931 ACPI_GPE_REGISTER_WIDTH) - 1)),
932 gpe_device->name.ascii, gpe_block->register_count,
933 interrupt_number));
934
935 return_ACPI_STATUS(AE_OK);
936 }
937
938 /*******************************************************************************
939 *
940 * FUNCTION: acpi_ev_initialize_gpe_block
941 *
942 * PARAMETERS: gpe_device - Handle to the parent GPE block
943 * gpe_block - Gpe Block info
944 *
945 * RETURN: Status
946 *
947 * DESCRIPTION: Initialize and enable a GPE block. First find and run any
948 * _PRT methods associated with the block, then enable the
949 * appropriate GPEs.
950 * Note: Assumes namespace is locked.
951 *
952 ******************************************************************************/
953
954 acpi_status
955 acpi_ev_initialize_gpe_block(struct acpi_namespace_node *gpe_device,
956 struct acpi_gpe_block_info *gpe_block)
957 {
958 acpi_status status;
959 struct acpi_gpe_event_info *gpe_event_info;
960 struct acpi_gpe_walk_info gpe_info;
961 u32 wake_gpe_count;
962 u32 gpe_enabled_count;
963 acpi_native_uint i;
964 acpi_native_uint j;
965
966 ACPI_FUNCTION_TRACE("ev_initialize_gpe_block");
967
968 /* Ignore a null GPE block (e.g., if no GPE block 1 exists) */
969
970 if (!gpe_block) {
971 return_ACPI_STATUS(AE_OK);
972 }
973
974 /*
975 * Runtime option: Should wake GPEs be enabled at runtime? The default
976 * is no, they should only be enabled just as the machine goes to sleep.
977 */
978 if (acpi_gbl_leave_wake_gpes_disabled) {
979 /*
980 * Differentiate runtime vs wake GPEs, via the _PRW control methods.
981 * Each GPE that has one or more _PRWs that reference it is by
982 * definition a wake GPE and will not be enabled while the machine
983 * is running.
984 */
985 gpe_info.gpe_block = gpe_block;
986 gpe_info.gpe_device = gpe_device;
987
988 status =
989 acpi_ns_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
990 ACPI_UINT32_MAX, ACPI_NS_WALK_UNLOCK,
991 acpi_ev_match_prw_and_gpe, &gpe_info,
992 NULL);
993 }
994
995 /*
996 * Enable all GPEs in this block that have these attributes:
997 * 1) are "runtime" or "run/wake" GPEs, and
998 * 2) have a corresponding _Lxx or _Exx method
999 *
1000 * Any other GPEs within this block must be enabled via the acpi_enable_gpe()
1001 * external interface.
1002 */
1003 wake_gpe_count = 0;
1004 gpe_enabled_count = 0;
1005
1006 for (i = 0; i < gpe_block->register_count; i++) {
1007 for (j = 0; j < 8; j++) {
1008 /* Get the info block for this particular GPE */
1009
1010 gpe_event_info =
1011 &gpe_block->
1012 event_info[(i * ACPI_GPE_REGISTER_WIDTH) + j];
1013
1014 if (((gpe_event_info->flags & ACPI_GPE_DISPATCH_MASK) ==
1015 ACPI_GPE_DISPATCH_METHOD)
1016 && (gpe_event_info->
1017 flags & ACPI_GPE_TYPE_RUNTIME)) {
1018 gpe_enabled_count++;
1019 }
1020
1021 if (gpe_event_info->flags & ACPI_GPE_TYPE_WAKE) {
1022 wake_gpe_count++;
1023 }
1024 }
1025 }
1026
1027 ACPI_DEBUG_PRINT((ACPI_DB_INIT,
1028 "Found %u Wake, Enabled %u Runtime GPEs in this block\n",
1029 wake_gpe_count, gpe_enabled_count));
1030
1031 /* Enable all valid runtime GPEs found above */
1032
1033 status = acpi_hw_enable_runtime_gpe_block(NULL, gpe_block);
1034 if (ACPI_FAILURE(status)) {
1035 ACPI_REPORT_ERROR(("Could not enable GPEs in gpe_block %p\n",
1036 gpe_block));
1037 }
1038
1039 return_ACPI_STATUS(status);
1040 }
1041
1042 /*******************************************************************************
1043 *
1044 * FUNCTION: acpi_ev_gpe_initialize
1045 *
1046 * PARAMETERS: None
1047 *
1048 * RETURN: Status
1049 *
1050 * DESCRIPTION: Initialize the GPE data structures
1051 *
1052 ******************************************************************************/
1053
1054 acpi_status acpi_ev_gpe_initialize(void)
1055 {
1056 u32 register_count0 = 0;
1057 u32 register_count1 = 0;
1058 u32 gpe_number_max = 0;
1059 acpi_status status;
1060
1061 ACPI_FUNCTION_TRACE("ev_gpe_initialize");
1062
1063 status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
1064 if (ACPI_FAILURE(status)) {
1065 return_ACPI_STATUS(status);
1066 }
1067
1068 /*
1069 * Initialize the GPE Block(s) defined in the FADT
1070 *
1071 * Why the GPE register block lengths are divided by 2: From the ACPI Spec,
1072 * section "General-Purpose Event Registers", we have:
1073 *
1074 * "Each register block contains two registers of equal length
1075 * GPEx_STS and GPEx_EN (where x is 0 or 1). The length of the
1076 * GPE0_STS and GPE0_EN registers is equal to half the GPE0_LEN
1077 * The length of the GPE1_STS and GPE1_EN registers is equal to
1078 * half the GPE1_LEN. If a generic register block is not supported
1079 * then its respective block pointer and block length values in the
1080 * FADT table contain zeros. The GPE0_LEN and GPE1_LEN do not need
1081 * to be the same size."
1082 */
1083
1084 /*
1085 * Determine the maximum GPE number for this machine.
1086 *
1087 * Note: both GPE0 and GPE1 are optional, and either can exist without
1088 * the other.
1089 *
1090 * If EITHER the register length OR the block address are zero, then that
1091 * particular block is not supported.
1092 */
1093 if (acpi_gbl_FADT->gpe0_blk_len && acpi_gbl_FADT->xgpe0_blk.address) {
1094 /* GPE block 0 exists (has both length and address > 0) */
1095
1096 register_count0 = (u16) (acpi_gbl_FADT->gpe0_blk_len / 2);
1097
1098 gpe_number_max =
1099 (register_count0 * ACPI_GPE_REGISTER_WIDTH) - 1;
1100
1101 /* Install GPE Block 0 */
1102
1103 status = acpi_ev_create_gpe_block(acpi_gbl_fadt_gpe_device,
1104 &acpi_gbl_FADT->xgpe0_blk,
1105 register_count0, 0,
1106 acpi_gbl_FADT->sci_int,
1107 &acpi_gbl_gpe_fadt_blocks[0]);
1108
1109 if (ACPI_FAILURE(status)) {
1110 ACPI_REPORT_ERROR(("Could not create GPE Block 0, %s\n",
1111 acpi_format_exception(status)));
1112 }
1113 }
1114
1115 if (acpi_gbl_FADT->gpe1_blk_len && acpi_gbl_FADT->xgpe1_blk.address) {
1116 /* GPE block 1 exists (has both length and address > 0) */
1117
1118 register_count1 = (u16) (acpi_gbl_FADT->gpe1_blk_len / 2);
1119
1120 /* Check for GPE0/GPE1 overlap (if both banks exist) */
1121
1122 if ((register_count0) &&
1123 (gpe_number_max >= acpi_gbl_FADT->gpe1_base)) {
1124 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)));
1125
1126 /* Ignore GPE1 block by setting the register count to zero */
1127
1128 register_count1 = 0;
1129 } else {
1130 /* Install GPE Block 1 */
1131
1132 status =
1133 acpi_ev_create_gpe_block(acpi_gbl_fadt_gpe_device,
1134 &acpi_gbl_FADT->xgpe1_blk,
1135 register_count1,
1136 acpi_gbl_FADT->gpe1_base,
1137 acpi_gbl_FADT->sci_int,
1138 &acpi_gbl_gpe_fadt_blocks
1139 [1]);
1140
1141 if (ACPI_FAILURE(status)) {
1142 ACPI_REPORT_ERROR(("Could not create GPE Block 1, %s\n", acpi_format_exception(status)));
1143 }
1144
1145 /*
1146 * GPE0 and GPE1 do not have to be contiguous in the GPE number
1147 * space. However, GPE0 always starts at GPE number zero.
1148 */
1149 gpe_number_max = acpi_gbl_FADT->gpe1_base +
1150 ((register_count1 * ACPI_GPE_REGISTER_WIDTH) - 1);
1151 }
1152 }
1153
1154 /* Exit if there are no GPE registers */
1155
1156 if ((register_count0 + register_count1) == 0) {
1157 /* GPEs are not required by ACPI, this is OK */
1158
1159 ACPI_DEBUG_PRINT((ACPI_DB_INIT,
1160 "There are no GPE blocks defined in the FADT\n"));
1161 status = AE_OK;
1162 goto cleanup;
1163 }
1164
1165 /* Check for Max GPE number out-of-range */
1166
1167 if (gpe_number_max > ACPI_GPE_MAX) {
1168 ACPI_REPORT_ERROR(("Maximum GPE number from FADT is too large: 0x%X\n", gpe_number_max));
1169 status = AE_BAD_VALUE;
1170 goto cleanup;
1171 }
1172
1173 cleanup:
1174 (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
1175 return_ACPI_STATUS(AE_OK);
1176 }
kernel source for telekom puls (alcatel/mediatek)