1 /******************************************************************************
3 * Module Name: evgpe - General Purpose Event handling and dispatch
5 *****************************************************************************/
8 * Copyright (C) 2000 - 2008, Intel Corp.
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions, and the following disclaimer,
16 * without modification.
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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.
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.
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
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41 * POSSIBILITY OF SUCH DAMAGES.
44 #include <acpi/acpi.h>
45 #include <acpi/acevents.h>
46 #include <acpi/acnamesp.h>
48 #define _COMPONENT ACPI_EVENTS
49 ACPI_MODULE_NAME("evgpe")
51 /* Local prototypes */
52 static void ACPI_SYSTEM_XFACE
acpi_ev_asynch_execute_gpe_method(void *context
);
54 /*******************************************************************************
56 * FUNCTION: acpi_ev_set_gpe_type
58 * PARAMETERS: gpe_event_info - GPE to set
63 * DESCRIPTION: Sets the new type for the GPE (wake, run, or wake/run)
65 ******************************************************************************/
68 acpi_ev_set_gpe_type(struct acpi_gpe_event_info
*gpe_event_info
, u8 type
)
72 ACPI_FUNCTION_TRACE(ev_set_gpe_type
);
74 /* Validate type and update register enable masks */
77 case ACPI_GPE_TYPE_WAKE
:
78 case ACPI_GPE_TYPE_RUNTIME
:
79 case ACPI_GPE_TYPE_WAKE_RUN
:
83 return_ACPI_STATUS(AE_BAD_PARAMETER
);
86 /* Disable the GPE if currently enabled */
88 status
= acpi_ev_disable_gpe(gpe_event_info
);
90 /* Type was validated above */
92 gpe_event_info
->flags
&= ~ACPI_GPE_TYPE_MASK
; /* Clear type bits */
93 gpe_event_info
->flags
|= type
; /* Insert type */
94 return_ACPI_STATUS(status
);
97 /*******************************************************************************
99 * FUNCTION: acpi_ev_update_gpe_enable_masks
101 * PARAMETERS: gpe_event_info - GPE to update
102 * Type - What to do: ACPI_GPE_DISABLE or
107 * DESCRIPTION: Updates GPE register enable masks based on the GPE type
109 ******************************************************************************/
112 acpi_ev_update_gpe_enable_masks(struct acpi_gpe_event_info
*gpe_event_info
,
115 struct acpi_gpe_register_info
*gpe_register_info
;
118 ACPI_FUNCTION_TRACE(ev_update_gpe_enable_masks
);
120 gpe_register_info
= gpe_event_info
->register_info
;
121 if (!gpe_register_info
) {
122 return_ACPI_STATUS(AE_NOT_EXIST
);
126 (gpe_event_info
->gpe_number
- gpe_register_info
->base_gpe_number
));
128 /* 1) Disable case. Simply clear all enable bits */
130 if (type
== ACPI_GPE_DISABLE
) {
131 ACPI_CLEAR_BIT(gpe_register_info
->enable_for_wake
,
133 ACPI_CLEAR_BIT(gpe_register_info
->enable_for_run
, register_bit
);
134 return_ACPI_STATUS(AE_OK
);
137 /* 2) Enable case. Set/Clear the appropriate enable bits */
139 switch (gpe_event_info
->flags
& ACPI_GPE_TYPE_MASK
) {
140 case ACPI_GPE_TYPE_WAKE
:
141 ACPI_SET_BIT(gpe_register_info
->enable_for_wake
, register_bit
);
142 ACPI_CLEAR_BIT(gpe_register_info
->enable_for_run
, register_bit
);
145 case ACPI_GPE_TYPE_RUNTIME
:
146 ACPI_CLEAR_BIT(gpe_register_info
->enable_for_wake
,
148 ACPI_SET_BIT(gpe_register_info
->enable_for_run
, register_bit
);
151 case ACPI_GPE_TYPE_WAKE_RUN
:
152 ACPI_SET_BIT(gpe_register_info
->enable_for_wake
, register_bit
);
153 ACPI_SET_BIT(gpe_register_info
->enable_for_run
, register_bit
);
157 return_ACPI_STATUS(AE_BAD_PARAMETER
);
160 return_ACPI_STATUS(AE_OK
);
163 /*******************************************************************************
165 * FUNCTION: acpi_ev_enable_gpe
167 * PARAMETERS: gpe_event_info - GPE to enable
168 * write_to_hardware - Enable now, or just mark data structs
169 * (WAKE GPEs should be deferred)
173 * DESCRIPTION: Enable a GPE based on the GPE type
175 ******************************************************************************/
178 acpi_ev_enable_gpe(struct acpi_gpe_event_info
*gpe_event_info
,
179 u8 write_to_hardware
)
183 ACPI_FUNCTION_TRACE(ev_enable_gpe
);
185 /* Make sure HW enable masks are updated */
188 acpi_ev_update_gpe_enable_masks(gpe_event_info
, ACPI_GPE_ENABLE
);
189 if (ACPI_FAILURE(status
)) {
190 return_ACPI_STATUS(status
);
193 /* Mark wake-enabled or HW enable, or both */
195 switch (gpe_event_info
->flags
& ACPI_GPE_TYPE_MASK
) {
196 case ACPI_GPE_TYPE_WAKE
:
198 ACPI_SET_BIT(gpe_event_info
->flags
, ACPI_GPE_WAKE_ENABLED
);
201 case ACPI_GPE_TYPE_WAKE_RUN
:
203 ACPI_SET_BIT(gpe_event_info
->flags
, ACPI_GPE_WAKE_ENABLED
);
205 /*lint -fallthrough */
207 case ACPI_GPE_TYPE_RUNTIME
:
209 ACPI_SET_BIT(gpe_event_info
->flags
, ACPI_GPE_RUN_ENABLED
);
211 if (write_to_hardware
) {
213 /* Clear the GPE (of stale events), then enable it */
215 status
= acpi_hw_clear_gpe(gpe_event_info
);
216 if (ACPI_FAILURE(status
)) {
217 return_ACPI_STATUS(status
);
220 /* Enable the requested runtime GPE */
222 status
= acpi_hw_write_gpe_enable_reg(gpe_event_info
);
227 return_ACPI_STATUS(AE_BAD_PARAMETER
);
230 return_ACPI_STATUS(AE_OK
);
233 /*******************************************************************************
235 * FUNCTION: acpi_ev_disable_gpe
237 * PARAMETERS: gpe_event_info - GPE to disable
241 * DESCRIPTION: Disable a GPE based on the GPE type
243 ******************************************************************************/
245 acpi_status
acpi_ev_disable_gpe(struct acpi_gpe_event_info
*gpe_event_info
)
249 ACPI_FUNCTION_TRACE(ev_disable_gpe
);
251 /* Make sure HW enable masks are updated */
254 acpi_ev_update_gpe_enable_masks(gpe_event_info
, ACPI_GPE_DISABLE
);
255 if (ACPI_FAILURE(status
)) {
256 return_ACPI_STATUS(status
);
259 /* Mark wake-disabled or HW disable, or both */
261 switch (gpe_event_info
->flags
& ACPI_GPE_TYPE_MASK
) {
262 case ACPI_GPE_TYPE_WAKE
:
263 ACPI_CLEAR_BIT(gpe_event_info
->flags
, ACPI_GPE_WAKE_ENABLED
);
266 case ACPI_GPE_TYPE_WAKE_RUN
:
267 ACPI_CLEAR_BIT(gpe_event_info
->flags
, ACPI_GPE_WAKE_ENABLED
);
271 case ACPI_GPE_TYPE_RUNTIME
:
273 /* Disable the requested runtime GPE */
275 ACPI_CLEAR_BIT(gpe_event_info
->flags
, ACPI_GPE_RUN_ENABLED
);
280 acpi_hw_write_gpe_enable_reg(gpe_event_info
);
283 return_ACPI_STATUS(AE_OK
);
286 /*******************************************************************************
288 * FUNCTION: acpi_ev_get_gpe_event_info
290 * PARAMETERS: gpe_device - Device node. NULL for GPE0/GPE1
291 * gpe_number - Raw GPE number
293 * RETURN: A GPE event_info struct. NULL if not a valid GPE
295 * DESCRIPTION: Returns the event_info struct associated with this GPE.
296 * Validates the gpe_block and the gpe_number
298 * Should be called only when the GPE lists are semaphore locked
299 * and not subject to change.
301 ******************************************************************************/
303 struct acpi_gpe_event_info
*acpi_ev_get_gpe_event_info(acpi_handle gpe_device
,
306 union acpi_operand_object
*obj_desc
;
307 struct acpi_gpe_block_info
*gpe_block
;
310 ACPI_FUNCTION_ENTRY();
312 /* A NULL gpe_block means use the FADT-defined GPE block(s) */
316 /* Examine GPE Block 0 and 1 (These blocks are permanent) */
318 for (i
= 0; i
< ACPI_MAX_GPE_BLOCKS
; i
++) {
319 gpe_block
= acpi_gbl_gpe_fadt_blocks
[i
];
321 if ((gpe_number
>= gpe_block
->block_base_number
)
323 gpe_block
->block_base_number
+
324 (gpe_block
->register_count
* 8))) {
326 event_info
[gpe_number
-
333 /* The gpe_number was not in the range of either FADT GPE block */
338 /* A Non-NULL gpe_device means this is a GPE Block Device */
340 obj_desc
= acpi_ns_get_attached_object((struct acpi_namespace_node
*)
342 if (!obj_desc
|| !obj_desc
->device
.gpe_block
) {
346 gpe_block
= obj_desc
->device
.gpe_block
;
348 if ((gpe_number
>= gpe_block
->block_base_number
) &&
350 gpe_block
->block_base_number
+ (gpe_block
->register_count
* 8))) {
352 event_info
[gpe_number
- gpe_block
->block_base_number
]);
358 /*******************************************************************************
360 * FUNCTION: acpi_ev_gpe_detect
362 * PARAMETERS: gpe_xrupt_list - Interrupt block for this interrupt.
363 * Can have multiple GPE blocks attached.
365 * RETURN: INTERRUPT_HANDLED or INTERRUPT_NOT_HANDLED
367 * DESCRIPTION: Detect if any GP events have occurred. This function is
368 * executed at interrupt level.
370 ******************************************************************************/
372 u32
acpi_ev_gpe_detect(struct acpi_gpe_xrupt_info
* gpe_xrupt_list
)
375 struct acpi_gpe_block_info
*gpe_block
;
376 struct acpi_gpe_register_info
*gpe_register_info
;
377 u32 int_status
= ACPI_INTERRUPT_NOT_HANDLED
;
378 u8 enabled_status_byte
;
381 acpi_cpu_flags flags
;
385 ACPI_FUNCTION_NAME(ev_gpe_detect
);
387 /* Check for the case where there are no GPEs */
389 if (!gpe_xrupt_list
) {
394 * We need to obtain the GPE lock for both the data structs and registers
395 * Note: Not necessary to obtain the hardware lock, since the GPE registers
396 * are owned by the gpe_lock.
398 flags
= acpi_os_acquire_lock(acpi_gbl_gpe_lock
);
400 /* Examine all GPE blocks attached to this interrupt level */
402 gpe_block
= gpe_xrupt_list
->gpe_block_list_head
;
405 * Read all of the 8-bit GPE status and enable registers
406 * in this GPE block, saving all of them.
407 * Find all currently active GP events.
409 for (i
= 0; i
< gpe_block
->register_count
; i
++) {
411 /* Get the next status/enable pair */
413 gpe_register_info
= &gpe_block
->register_info
[i
];
415 /* Read the Status Register */
418 acpi_hw_low_level_read(ACPI_GPE_REGISTER_WIDTH
,
422 if (ACPI_FAILURE(status
)) {
423 goto unlock_and_exit
;
426 /* Read the Enable Register */
429 acpi_hw_low_level_read(ACPI_GPE_REGISTER_WIDTH
,
433 if (ACPI_FAILURE(status
)) {
434 goto unlock_and_exit
;
437 ACPI_DEBUG_PRINT((ACPI_DB_INTERRUPTS
,
438 "Read GPE Register at GPE%X: Status=%02X, Enable=%02X\n",
439 gpe_register_info
->base_gpe_number
,
440 status_reg
, enable_reg
));
442 /* Check if there is anything active at all in this register */
444 enabled_status_byte
= (u8
) (status_reg
& enable_reg
);
445 if (!enabled_status_byte
) {
447 /* No active GPEs in this register, move on */
452 /* Now look at the individual GPEs in this byte register */
454 for (j
= 0; j
< ACPI_GPE_REGISTER_WIDTH
; j
++) {
456 /* Examine one GPE bit */
458 if (enabled_status_byte
& (1 << j
)) {
460 * Found an active GPE. Dispatch the event to a handler
464 acpi_ev_gpe_dispatch(&gpe_block
->
466 ACPI_GPE_REGISTER_WIDTH
)
476 gpe_block
= gpe_block
->next
;
481 acpi_os_release_lock(acpi_gbl_gpe_lock
, flags
);
485 /*******************************************************************************
487 * FUNCTION: acpi_ev_asynch_execute_gpe_method
489 * PARAMETERS: Context (gpe_event_info) - Info for this GPE
493 * DESCRIPTION: Perform the actual execution of a GPE control method. This
494 * function is called from an invocation of acpi_os_execute and
495 * therefore does NOT execute at interrupt level - so that
496 * the control method itself is not executed in the context of
497 * an interrupt handler.
499 ******************************************************************************/
500 static void acpi_ev_asynch_enable_gpe(void *context
);
502 static void ACPI_SYSTEM_XFACE
acpi_ev_asynch_execute_gpe_method(void *context
)
504 struct acpi_gpe_event_info
*gpe_event_info
= (void *)context
;
506 struct acpi_gpe_event_info local_gpe_event_info
;
507 struct acpi_evaluate_info
*info
;
509 ACPI_FUNCTION_TRACE(ev_asynch_execute_gpe_method
);
511 status
= acpi_ut_acquire_mutex(ACPI_MTX_EVENTS
);
512 if (ACPI_FAILURE(status
)) {
516 /* Must revalidate the gpe_number/gpe_block */
518 if (!acpi_ev_valid_gpe_event(gpe_event_info
)) {
519 status
= acpi_ut_release_mutex(ACPI_MTX_EVENTS
);
523 /* Set the GPE flags for return to enabled state */
525 (void)acpi_ev_enable_gpe(gpe_event_info
, FALSE
);
528 * Take a snapshot of the GPE info for this level - we copy the
529 * info to prevent a race condition with remove_handler/remove_block.
531 ACPI_MEMCPY(&local_gpe_event_info
, gpe_event_info
,
532 sizeof(struct acpi_gpe_event_info
));
534 status
= acpi_ut_release_mutex(ACPI_MTX_EVENTS
);
535 if (ACPI_FAILURE(status
)) {
540 * Must check for control method type dispatch one more
541 * time to avoid race with ev_gpe_install_handler
543 if ((local_gpe_event_info
.flags
& ACPI_GPE_DISPATCH_MASK
) ==
544 ACPI_GPE_DISPATCH_METHOD
) {
546 /* Allocate the evaluation information block */
548 info
= ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_evaluate_info
));
550 status
= AE_NO_MEMORY
;
553 * Invoke the GPE Method (_Lxx, _Exx) i.e., evaluate the _Lxx/_Exx
554 * control method that corresponds to this GPE
557 local_gpe_event_info
.dispatch
.method_node
;
559 ACPI_CAST_PTR(union acpi_operand_object
*,
561 info
->parameter_type
= ACPI_PARAM_GPE
;
562 info
->flags
= ACPI_IGNORE_RETURN_VALUE
;
564 status
= acpi_ns_evaluate(info
);
568 if (ACPI_FAILURE(status
)) {
569 ACPI_EXCEPTION((AE_INFO
, status
,
570 "while evaluating GPE method [%4.4s]",
571 acpi_ut_get_node_name
572 (local_gpe_event_info
.dispatch
.
576 /* Defer enabling of GPE until all notify handlers are done */
577 acpi_os_execute(OSL_NOTIFY_HANDLER
, acpi_ev_asynch_enable_gpe
,
582 static void acpi_ev_asynch_enable_gpe(void *context
)
584 struct acpi_gpe_event_info
*gpe_event_info
= context
;
586 if ((gpe_event_info
->flags
& ACPI_GPE_XRUPT_TYPE_MASK
) ==
587 ACPI_GPE_LEVEL_TRIGGERED
) {
589 * GPE is level-triggered, we clear the GPE status bit after
590 * handling the event.
592 status
= acpi_hw_clear_gpe(gpe_event_info
);
593 if (ACPI_FAILURE(status
)) {
598 /* Enable this GPE */
599 (void)acpi_hw_write_gpe_enable_reg(gpe_event_info
);
603 /*******************************************************************************
605 * FUNCTION: acpi_ev_gpe_dispatch
607 * PARAMETERS: gpe_event_info - Info for this GPE
608 * gpe_number - Number relative to the parent GPE block
610 * RETURN: INTERRUPT_HANDLED or INTERRUPT_NOT_HANDLED
612 * DESCRIPTION: Dispatch a General Purpose Event to either a function (e.g. EC)
613 * or method (e.g. _Lxx/_Exx) handler.
615 * This function executes at interrupt level.
617 ******************************************************************************/
620 acpi_ev_gpe_dispatch(struct acpi_gpe_event_info
*gpe_event_info
, u32 gpe_number
)
624 ACPI_FUNCTION_TRACE(ev_gpe_dispatch
);
626 acpi_os_gpe_count(gpe_number
);
629 * If edge-triggered, clear the GPE status bit now. Note that
630 * level-triggered events are cleared after the GPE is serviced.
632 if ((gpe_event_info
->flags
& ACPI_GPE_XRUPT_TYPE_MASK
) ==
633 ACPI_GPE_EDGE_TRIGGERED
) {
634 status
= acpi_hw_clear_gpe(gpe_event_info
);
635 if (ACPI_FAILURE(status
)) {
636 ACPI_EXCEPTION((AE_INFO
, status
,
637 "Unable to clear GPE[%2X]",
639 return_UINT32(ACPI_INTERRUPT_NOT_HANDLED
);
644 * Dispatch the GPE to either an installed handler, or the control method
645 * associated with this GPE (_Lxx or _Exx). If a handler exists, we invoke
646 * it and do not attempt to run the method. If there is neither a handler
647 * nor a method, we disable this GPE to prevent further such pointless
648 * events from firing.
650 switch (gpe_event_info
->flags
& ACPI_GPE_DISPATCH_MASK
) {
651 case ACPI_GPE_DISPATCH_HANDLER
:
654 * Invoke the installed handler (at interrupt level)
655 * Ignore return status for now. TBD: leave GPE disabled on error?
657 (void)gpe_event_info
->dispatch
.handler
->address(gpe_event_info
->
662 /* It is now safe to clear level-triggered events. */
664 if ((gpe_event_info
->flags
& ACPI_GPE_XRUPT_TYPE_MASK
) ==
665 ACPI_GPE_LEVEL_TRIGGERED
) {
666 status
= acpi_hw_clear_gpe(gpe_event_info
);
667 if (ACPI_FAILURE(status
)) {
668 ACPI_EXCEPTION((AE_INFO
, status
,
669 "Unable to clear GPE[%2X]",
671 return_UINT32(ACPI_INTERRUPT_NOT_HANDLED
);
676 case ACPI_GPE_DISPATCH_METHOD
:
679 * Disable the GPE, so it doesn't keep firing before the method has a
680 * chance to run (it runs asynchronously with interrupts enabled).
682 status
= acpi_ev_disable_gpe(gpe_event_info
);
683 if (ACPI_FAILURE(status
)) {
684 ACPI_EXCEPTION((AE_INFO
, status
,
685 "Unable to disable GPE[%2X]",
687 return_UINT32(ACPI_INTERRUPT_NOT_HANDLED
);
691 * Execute the method associated with the GPE
692 * NOTE: Level-triggered GPEs are cleared after the method completes.
694 status
= acpi_os_execute(OSL_GPE_HANDLER
,
695 acpi_ev_asynch_execute_gpe_method
,
697 if (ACPI_FAILURE(status
)) {
698 ACPI_EXCEPTION((AE_INFO
, status
,
699 "Unable to queue handler for GPE[%2X] - event disabled",
706 /* No handler or method to run! */
709 "No handler or method for GPE[%2X], disabling event",
713 * Disable the GPE. The GPE will remain disabled until the ACPI
714 * Core Subsystem is restarted, or a handler is installed.
716 status
= acpi_ev_disable_gpe(gpe_event_info
);
717 if (ACPI_FAILURE(status
)) {
718 ACPI_EXCEPTION((AE_INFO
, status
,
719 "Unable to disable GPE[%2X]",
721 return_UINT32(ACPI_INTERRUPT_NOT_HANDLED
);
726 return_UINT32(ACPI_INTERRUPT_HANDLED
);