drivers/acpi/acpica/evgpeblk.c - kernel/msm-4.19 - Gitiles

 /******************************************************************************
  *
  * Module Name: evgpeblk - GPE block creation and initialization.
  *
  *****************************************************************************/

 /*
  * Copyright (C) 2000 - 2013, Intel Corp.
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions, and the following disclaimer,
  *    without modification.
  * 2. Redistributions in binary form must reproduce at minimum a disclaimer
  *    substantially similar to the "NO WARRANTY" disclaimer below
  *    ("Disclaimer") and any redistribution must be conditioned upon
  *    including a substantially similar Disclaimer requirement for further
  *    binary redistribution.
  * 3. Neither the names of the above-listed copyright holders nor the names
  *    of any contributors may be used to endorse or promote products derived
  *    from this software without specific prior written permission.
  *
  * Alternatively, this software may be distributed under the terms of the
  * GNU General Public License ("GPL") version 2 as published by the Free
  * Software Foundation.
  *
  * NO WARRANTY
  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  * POSSIBILITY OF SUCH DAMAGES.
  */

 #include <acpi/acpi.h>
 #include "accommon.h"
 #include "acevents.h"
 #include "acnamesp.h"

 #define _COMPONENT          ACPI_EVENTS
 ACPI_MODULE_NAME("evgpeblk")
 #if (!ACPI_REDUCED_HARDWARE)	/* Entire module */
 /* Local prototypes */
 static acpi_status
 acpi_ev_install_gpe_block(struct acpi_gpe_block_info *gpe_block,
 			  u32 interrupt_number);

 static acpi_status
 acpi_ev_create_gpe_info_blocks(struct acpi_gpe_block_info *gpe_block);

 /*******************************************************************************
  *
  * FUNCTION:    acpi_ev_install_gpe_block
  *
  * PARAMETERS:  gpe_block               - New GPE block
  *              interrupt_number        - Xrupt to be associated with this
  *                                        GPE block
  *
  * RETURN:      Status
  *
  * DESCRIPTION: Install new GPE block with mutex support
  *
  ******************************************************************************/

 static acpi_status
 acpi_ev_install_gpe_block(struct acpi_gpe_block_info *gpe_block,
 			  u32 interrupt_number)
 {
 	struct acpi_gpe_block_info *next_gpe_block;
 	struct acpi_gpe_xrupt_info *gpe_xrupt_block;
 	acpi_status status;
 	acpi_cpu_flags flags;

 	ACPI_FUNCTION_TRACE(ev_install_gpe_block);

 	status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
 	if (ACPI_FAILURE(status)) {
 		return_ACPI_STATUS(status);
 	}

 	gpe_xrupt_block = acpi_ev_get_gpe_xrupt_block(interrupt_number);
 	if (!gpe_xrupt_block) {
 		status = AE_NO_MEMORY;
 		goto unlock_and_exit;
 	}

 	/* Install the new block at the end of the list with lock */

 	flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
 	if (gpe_xrupt_block->gpe_block_list_head) {
 		next_gpe_block = gpe_xrupt_block->gpe_block_list_head;
 		while (next_gpe_block->next) {
 			next_gpe_block = next_gpe_block->next;
 		}

 		next_gpe_block->next = gpe_block;
 		gpe_block->previous = next_gpe_block;
 	} else {
 		gpe_xrupt_block->gpe_block_list_head = gpe_block;
 	}

 	gpe_block->xrupt_block = gpe_xrupt_block;
 	acpi_os_release_lock(acpi_gbl_gpe_lock, flags);

 unlock_and_exit:
 	status = acpi_ut_release_mutex(ACPI_MTX_EVENTS);
 	return_ACPI_STATUS(status);
 }

 /*******************************************************************************
  *
  * FUNCTION:    acpi_ev_delete_gpe_block
  *
  * PARAMETERS:  gpe_block           - Existing GPE block
  *
  * RETURN:      Status
  *
  * DESCRIPTION: Remove a GPE block
  *
  ******************************************************************************/

 acpi_status acpi_ev_delete_gpe_block(struct acpi_gpe_block_info *gpe_block)
 {
 	acpi_status status;
 	acpi_cpu_flags flags;

 	ACPI_FUNCTION_TRACE(ev_install_gpe_block);

 	status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
 	if (ACPI_FAILURE(status)) {
 		return_ACPI_STATUS(status);
 	}

 	/* Disable all GPEs in this block */

 	status =
 	    acpi_hw_disable_gpe_block(gpe_block->xrupt_block, gpe_block, NULL);

 	if (!gpe_block->previous && !gpe_block->next) {

 		/* This is the last gpe_block on this interrupt */

 		status = acpi_ev_delete_gpe_xrupt(gpe_block->xrupt_block);
 		if (ACPI_FAILURE(status)) {
 			goto unlock_and_exit;
 		}
 	} else {
 		/* Remove the block on this interrupt with lock */

 		flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
 		if (gpe_block->previous) {
 			gpe_block->previous->next = gpe_block->next;
 		} else {
 			gpe_block->xrupt_block->gpe_block_list_head =
 			    gpe_block->next;
 		}

 		if (gpe_block->next) {
 			gpe_block->next->previous = gpe_block->previous;
 		}
 		acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
 	}

 	acpi_current_gpe_count -= gpe_block->gpe_count;

 	/* Free the gpe_block */

 	ACPI_FREE(gpe_block->register_info);
 	ACPI_FREE(gpe_block->event_info);
 	ACPI_FREE(gpe_block);

 unlock_and_exit:
 	status = acpi_ut_release_mutex(ACPI_MTX_EVENTS);
 	return_ACPI_STATUS(status);
 }

 /*******************************************************************************
  *
  * FUNCTION:    acpi_ev_create_gpe_info_blocks
  *
  * PARAMETERS:  gpe_block   - New GPE block
  *
  * RETURN:      Status
  *
  * DESCRIPTION: Create the register_info and event_info blocks for this GPE block
  *
  ******************************************************************************/

 static acpi_status
 acpi_ev_create_gpe_info_blocks(struct acpi_gpe_block_info *gpe_block)
 {
 	struct acpi_gpe_register_info *gpe_register_info = NULL;
 	struct acpi_gpe_event_info *gpe_event_info = NULL;
 	struct acpi_gpe_event_info *this_event;
 	struct acpi_gpe_register_info *this_register;
 	u32 i;
 	u32 j;
 	acpi_status status;

 	ACPI_FUNCTION_TRACE(ev_create_gpe_info_blocks);

 	/* Allocate the GPE register information block */

 	gpe_register_info = ACPI_ALLOCATE_ZEROED((acpi_size) gpe_block->
 						 register_count *
 						 sizeof(struct
 							acpi_gpe_register_info));
 	if (!gpe_register_info) {
 		ACPI_ERROR((AE_INFO,
 			    "Could not allocate the GpeRegisterInfo table"));
 		return_ACPI_STATUS(AE_NO_MEMORY);
 	}

 	/*
 	 * Allocate the GPE event_info block. There are eight distinct GPEs
 	 * per register. Initialization to zeros is sufficient.
 	 */
 	gpe_event_info = ACPI_ALLOCATE_ZEROED((acpi_size) gpe_block->gpe_count *
 					      sizeof(struct
 						     acpi_gpe_event_info));
 	if (!gpe_event_info) {
 		ACPI_ERROR((AE_INFO,
 			    "Could not allocate the GpeEventInfo table"));
 		status = AE_NO_MEMORY;
 		goto error_exit;
 	}

 	/* Save the new Info arrays in the GPE block */

 	gpe_block->register_info = gpe_register_info;
 	gpe_block->event_info = gpe_event_info;

 	/*
 	 * Initialize the GPE Register and Event structures. A goal of these
 	 * tables is to hide the fact that there are two separate GPE register
 	 * sets in a given GPE hardware block, the status registers occupy the
 	 * first half, and the enable registers occupy the second half.
 	 */
 	this_register = gpe_register_info;
 	this_event = gpe_event_info;

 	for (i = 0; i < gpe_block->register_count; i++) {

 		/* Init the register_info for this GPE register (8 GPEs) */

 		this_register->base_gpe_number =
 		    (u8) (gpe_block->block_base_number +
 			  (i * ACPI_GPE_REGISTER_WIDTH));

 		this_register->status_address.address =
 		    gpe_block->block_address.address + i;

 		this_register->enable_address.address =
 		    gpe_block->block_address.address + i +
 		    gpe_block->register_count;

 		this_register->status_address.space_id =
 		    gpe_block->block_address.space_id;
 		this_register->enable_address.space_id =
 		    gpe_block->block_address.space_id;
 		this_register->status_address.bit_width =
 		    ACPI_GPE_REGISTER_WIDTH;
 		this_register->enable_address.bit_width =
 		    ACPI_GPE_REGISTER_WIDTH;
 		this_register->status_address.bit_offset = 0;
 		this_register->enable_address.bit_offset = 0;

 		/* Init the event_info for each GPE within this register */

 		for (j = 0; j < ACPI_GPE_REGISTER_WIDTH; j++) {
 			this_event->gpe_number =
 			    (u8) (this_register->base_gpe_number + j);
 			this_event->register_info = this_register;
 			this_event++;
 		}

 		/* Disable all GPEs within this register */

 		status = acpi_hw_write(0x00, &this_register->enable_address);
 		if (ACPI_FAILURE(status)) {
 			goto error_exit;
 		}

 		/* Clear any pending GPE events within this register */

 		status = acpi_hw_write(0xFF, &this_register->status_address);
 		if (ACPI_FAILURE(status)) {
 			goto error_exit;
 		}

 		this_register++;
 	}

 	return_ACPI_STATUS(AE_OK);

 error_exit:
 	if (gpe_register_info) {
 		ACPI_FREE(gpe_register_info);
 	}
 	if (gpe_event_info) {
 		ACPI_FREE(gpe_event_info);
 	}

 	return_ACPI_STATUS(status);
 }

 /*******************************************************************************
  *
  * FUNCTION:    acpi_ev_create_gpe_block
  *
  * PARAMETERS:  gpe_device          - Handle to the parent GPE block
  *              gpe_block_address   - Address and space_ID
  *              register_count      - Number of GPE register pairs in the block
  *              gpe_block_base_number - Starting GPE number for the block
  *              interrupt_number    - H/W interrupt for the block
  *              return_gpe_block    - Where the new block descriptor is returned
  *
  * RETURN:      Status
  *
  * DESCRIPTION: Create and Install a block of GPE registers. All GPEs within
  *              the block are disabled at exit.
  *              Note: Assumes namespace is locked.
  *
  ******************************************************************************/

 acpi_status
 acpi_ev_create_gpe_block(struct acpi_namespace_node *gpe_device,
 			 struct acpi_generic_address *gpe_block_address,
 			 u32 register_count,
 			 u8 gpe_block_base_number,
 			 u32 interrupt_number,
 			 struct acpi_gpe_block_info **return_gpe_block)
 {
 	acpi_status status;
 	struct acpi_gpe_block_info *gpe_block;
 	struct acpi_gpe_walk_info walk_info;

 	ACPI_FUNCTION_TRACE(ev_create_gpe_block);

 	if (!register_count) {
 		return_ACPI_STATUS(AE_OK);
 	}

 	/* Allocate a new GPE block */

 	gpe_block = ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_gpe_block_info));
 	if (!gpe_block) {
 		return_ACPI_STATUS(AE_NO_MEMORY);
 	}

 	/* Initialize the new GPE block */

 	gpe_block->node = gpe_device;
 	gpe_block->gpe_count = (u16)(register_count * ACPI_GPE_REGISTER_WIDTH);
 	gpe_block->initialized = FALSE;
 	gpe_block->register_count = register_count;
 	gpe_block->block_base_number = gpe_block_base_number;

 	ACPI_MEMCPY(&gpe_block->block_address, gpe_block_address,
 		    sizeof(struct acpi_generic_address));

 	/*
 	 * Create the register_info and event_info sub-structures
 	 * Note: disables and clears all GPEs in the block
 	 */
 	status = acpi_ev_create_gpe_info_blocks(gpe_block);
 	if (ACPI_FAILURE(status)) {
 		ACPI_FREE(gpe_block);
 		return_ACPI_STATUS(status);
 	}

 	/* Install the new block in the global lists */

 	status = acpi_ev_install_gpe_block(gpe_block, interrupt_number);
 	if (ACPI_FAILURE(status)) {
 		ACPI_FREE(gpe_block->register_info);
 		ACPI_FREE(gpe_block->event_info);
 		ACPI_FREE(gpe_block);
 		return_ACPI_STATUS(status);
 	}

 	acpi_gbl_all_gpes_initialized = FALSE;

 	/* Find all GPE methods (_Lxx or_Exx) for this block */

 	walk_info.gpe_block = gpe_block;
 	walk_info.gpe_device = gpe_device;
 	walk_info.execute_by_owner_id = FALSE;

 	status = acpi_ns_walk_namespace(ACPI_TYPE_METHOD, gpe_device,
 					ACPI_UINT32_MAX, ACPI_NS_WALK_NO_UNLOCK,
 					acpi_ev_match_gpe_method, NULL,
 					&walk_info, NULL);

 	/* Return the new block */

 	if (return_gpe_block) {
 		(*return_gpe_block) = gpe_block;
 	}

 	ACPI_DEBUG_PRINT_RAW((ACPI_DB_INIT,
 			      "    Initialized GPE %02X to %02X [%4.4s] %u regs on interrupt 0x%X\n",
 			      (u32)gpe_block->block_base_number,
 			      (u32)(gpe_block->block_base_number +
 				    (gpe_block->gpe_count - 1)),
 			      gpe_device->name.ascii, gpe_block->register_count,
 			      interrupt_number));

 	/* Update global count of currently available GPEs */

 	acpi_current_gpe_count += gpe_block->gpe_count;
 	return_ACPI_STATUS(AE_OK);
 }

 /*******************************************************************************
  *
  * FUNCTION:    acpi_ev_initialize_gpe_block
  *
  * PARAMETERS:  acpi_gpe_callback
  *
  * RETURN:      Status
  *
  * DESCRIPTION: Initialize and enable a GPE block. Enable GPEs that have
  *              associated methods.
  *              Note: Assumes namespace is locked.
  *
  ******************************************************************************/

 acpi_status
 acpi_ev_initialize_gpe_block(struct acpi_gpe_xrupt_info *gpe_xrupt_info,
 			     struct acpi_gpe_block_info *gpe_block,
 			     void *ignored)
 {
 	acpi_status status;
 	struct acpi_gpe_event_info *gpe_event_info;
 	u32 gpe_enabled_count;
 	u32 gpe_index;
 	u32 i;
 	u32 j;

 	ACPI_FUNCTION_TRACE(ev_initialize_gpe_block);

 	/*
 	 * Ignore a null GPE block (e.g., if no GPE block 1 exists), and
 	 * any GPE blocks that have been initialized already.
 	 */
 	if (!gpe_block || gpe_block->initialized) {
 		return_ACPI_STATUS(AE_OK);
 	}

 	/*
 	 * Enable all GPEs that have a corresponding method and have the
 	 * ACPI_GPE_CAN_WAKE flag unset. Any other GPEs within this block
 	 * must be enabled via the acpi_enable_gpe() interface.
 	 */
 	gpe_enabled_count = 0;

 	for (i = 0; i < gpe_block->register_count; i++) {
 		for (j = 0; j < ACPI_GPE_REGISTER_WIDTH; j++) {

 			/* Get the info block for this particular GPE */

 			gpe_index = (i * ACPI_GPE_REGISTER_WIDTH) + j;
 			gpe_event_info = &gpe_block->event_info[gpe_index];

 			/*
 			 * Ignore GPEs that have no corresponding _Lxx/_Exx method
 			 * and GPEs that are used to wake the system
 			 */
 			if (((gpe_event_info->flags & ACPI_GPE_DISPATCH_MASK) ==
 			     ACPI_GPE_DISPATCH_NONE)
 			    || ((gpe_event_info->flags & ACPI_GPE_DISPATCH_MASK)
 				== ACPI_GPE_DISPATCH_HANDLER)
 			    || (gpe_event_info->flags & ACPI_GPE_CAN_WAKE)) {
 				continue;
 			}

 			status = acpi_ev_add_gpe_reference(gpe_event_info);
 			if (ACPI_FAILURE(status)) {
 				ACPI_EXCEPTION((AE_INFO, status,
 					"Could not enable GPE 0x%02X",
 					gpe_index +
 					gpe_block->block_base_number));
 				continue;
 			}

 			gpe_enabled_count++;
 		}
 	}

 	if (gpe_enabled_count) {
 		ACPI_INFO((AE_INFO,
 			   "Enabled %u GPEs in block %02X to %02X",
 			   gpe_enabled_count, (u32)gpe_block->block_base_number,
 			   (u32)(gpe_block->block_base_number +
 				 (gpe_block->gpe_count - 1))));
 	}

 	gpe_block->initialized = TRUE;

 	return_ACPI_STATUS(AE_OK);
 }

 #endif				/* !ACPI_REDUCED_HARDWARE */
	/******************************************************************************
	*
	* Module Name: evgpeblk - GPE block creation and initialization.
	*
	*****************************************************************************/

	/*
	* Copyright (C) 2000 - 2013, Intel Corp.
	* All rights reserved.
	*
	* Redistribution and use in source and binary forms, with or without
	* modification, are permitted provided that the following conditions
	* are met:
	* 1. Redistributions of source code must retain the above copyright
	* notice, this list of conditions, and the following disclaimer,
	* without modification.
	* 2. Redistributions in binary form must reproduce at minimum a disclaimer
	* substantially similar to the "NO WARRANTY" disclaimer below
	* ("Disclaimer") and any redistribution must be conditioned upon
	* including a substantially similar Disclaimer requirement for further
	* binary redistribution.
	* 3. Neither the names of the above-listed copyright holders nor the names
	* of any contributors may be used to endorse or promote products derived
	* from this software without specific prior written permission.
	*
	* Alternatively, this software may be distributed under the terms of the
	* GNU General Public License ("GPL") version 2 as published by the Free
	* Software Foundation.
	*
	* NO WARRANTY
	* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
	* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
	* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
	* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
	* HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
	* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
	* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
	* POSSIBILITY OF SUCH DAMAGES.
	*/

	#include <acpi/acpi.h>
	#include "accommon.h"
	#include "acevents.h"
	#include "acnamesp.h"

	#define _COMPONENT ACPI_EVENTS
	ACPI_MODULE_NAME("evgpeblk")
	#if (!ACPI_REDUCED_HARDWARE) /* Entire module */
	/* Local prototypes */
	static acpi_status
	acpi_ev_install_gpe_block(struct acpi_gpe_block_info *gpe_block,
	u32 interrupt_number);

	static acpi_status
	acpi_ev_create_gpe_info_blocks(struct acpi_gpe_block_info *gpe_block);

	/*******************************************************************************
	*
	* FUNCTION: acpi_ev_install_gpe_block
	*
	* PARAMETERS: gpe_block - New GPE block
	* interrupt_number - Xrupt to be associated with this
	* GPE block
	*
	* RETURN: Status
	*
	* DESCRIPTION: Install new GPE block with mutex support
	*
	******************************************************************************/

	static acpi_status
	acpi_ev_install_gpe_block(struct acpi_gpe_block_info *gpe_block,
	u32 interrupt_number)
	{
	struct acpi_gpe_block_info *next_gpe_block;
	struct acpi_gpe_xrupt_info *gpe_xrupt_block;
	acpi_status status;
	acpi_cpu_flags flags;

	ACPI_FUNCTION_TRACE(ev_install_gpe_block);

	status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
	if (ACPI_FAILURE(status)) {
	return_ACPI_STATUS(status);
	}

	gpe_xrupt_block = acpi_ev_get_gpe_xrupt_block(interrupt_number);
	if (!gpe_xrupt_block) {
	status = AE_NO_MEMORY;
	goto unlock_and_exit;
	}

	/* Install the new block at the end of the list with lock */

	flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
	if (gpe_xrupt_block->gpe_block_list_head) {
	next_gpe_block = gpe_xrupt_block->gpe_block_list_head;
	while (next_gpe_block->next) {
	next_gpe_block = next_gpe_block->next;
	}

	next_gpe_block->next = gpe_block;
	gpe_block->previous = next_gpe_block;
	} else {
	gpe_xrupt_block->gpe_block_list_head = gpe_block;
	}

	gpe_block->xrupt_block = gpe_xrupt_block;
	acpi_os_release_lock(acpi_gbl_gpe_lock, flags);

	unlock_and_exit:
	status = acpi_ut_release_mutex(ACPI_MTX_EVENTS);
	return_ACPI_STATUS(status);
	}

	/*******************************************************************************
	*
	* FUNCTION: acpi_ev_delete_gpe_block
	*
	* PARAMETERS: gpe_block - Existing GPE block
	*
	* RETURN: Status
	*
	* DESCRIPTION: Remove a GPE block
	*
	******************************************************************************/

	acpi_status acpi_ev_delete_gpe_block(struct acpi_gpe_block_info *gpe_block)
	{
	acpi_status status;
	acpi_cpu_flags flags;

	ACPI_FUNCTION_TRACE(ev_install_gpe_block);

	status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
	if (ACPI_FAILURE(status)) {
	return_ACPI_STATUS(status);
	}

	/* Disable all GPEs in this block */

	status =
	acpi_hw_disable_gpe_block(gpe_block->xrupt_block, gpe_block, NULL);

	if (!gpe_block->previous && !gpe_block->next) {

	/* This is the last gpe_block on this interrupt */

	status = acpi_ev_delete_gpe_xrupt(gpe_block->xrupt_block);
	if (ACPI_FAILURE(status)) {
	goto unlock_and_exit;
	}
	} else {
	/* Remove the block on this interrupt with lock */

	flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
	if (gpe_block->previous) {
	gpe_block->previous->next = gpe_block->next;
	} else {
	gpe_block->xrupt_block->gpe_block_list_head =
	gpe_block->next;
	}

	if (gpe_block->next) {
	gpe_block->next->previous = gpe_block->previous;
	}
	acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
	}

	acpi_current_gpe_count -= gpe_block->gpe_count;

	/* Free the gpe_block */

	ACPI_FREE(gpe_block->register_info);
	ACPI_FREE(gpe_block->event_info);
	ACPI_FREE(gpe_block);

	unlock_and_exit:
	status = acpi_ut_release_mutex(ACPI_MTX_EVENTS);
	return_ACPI_STATUS(status);
	}

	/*******************************************************************************
	*
	* FUNCTION: acpi_ev_create_gpe_info_blocks
	*
	* PARAMETERS: gpe_block - New GPE block
	*
	* RETURN: Status
	*
	* DESCRIPTION: Create the register_info and event_info blocks for this GPE block
	*
	******************************************************************************/

	static acpi_status
	acpi_ev_create_gpe_info_blocks(struct acpi_gpe_block_info *gpe_block)
	{
	struct acpi_gpe_register_info *gpe_register_info = NULL;
	struct acpi_gpe_event_info *gpe_event_info = NULL;
	struct acpi_gpe_event_info *this_event;
	struct acpi_gpe_register_info *this_register;
	u32 i;
	u32 j;
	acpi_status status;

	ACPI_FUNCTION_TRACE(ev_create_gpe_info_blocks);

	/* Allocate the GPE register information block */

	gpe_register_info = ACPI_ALLOCATE_ZEROED((acpi_size) gpe_block->
	register_count *
	sizeof(struct
	acpi_gpe_register_info));
	if (!gpe_register_info) {
	ACPI_ERROR((AE_INFO,
	"Could not allocate the GpeRegisterInfo table"));
	return_ACPI_STATUS(AE_NO_MEMORY);
	}

	/*
	* Allocate the GPE event_info block. There are eight distinct GPEs
	* per register. Initialization to zeros is sufficient.
	*/
	gpe_event_info = ACPI_ALLOCATE_ZEROED((acpi_size) gpe_block->gpe_count *
	sizeof(struct
	acpi_gpe_event_info));
	if (!gpe_event_info) {
	ACPI_ERROR((AE_INFO,
	"Could not allocate the GpeEventInfo table"));
	status = AE_NO_MEMORY;
	goto error_exit;
	}

	/* Save the new Info arrays in the GPE block */

	gpe_block->register_info = gpe_register_info;
	gpe_block->event_info = gpe_event_info;

	/*
	* Initialize the GPE Register and Event structures. A goal of these
	* tables is to hide the fact that there are two separate GPE register
	* sets in a given GPE hardware block, the status registers occupy the
	* first half, and the enable registers occupy the second half.
	*/
	this_register = gpe_register_info;
	this_event = gpe_event_info;

	for (i = 0; i < gpe_block->register_count; i++) {

	/* Init the register_info for this GPE register (8 GPEs) */

	this_register->base_gpe_number =
	(u8) (gpe_block->block_base_number +
	(i * ACPI_GPE_REGISTER_WIDTH));

	this_register->status_address.address =
	gpe_block->block_address.address + i;

	this_register->enable_address.address =
	gpe_block->block_address.address + i +
	gpe_block->register_count;

	this_register->status_address.space_id =
	gpe_block->block_address.space_id;
	this_register->enable_address.space_id =
	gpe_block->block_address.space_id;
	this_register->status_address.bit_width =
	ACPI_GPE_REGISTER_WIDTH;
	this_register->enable_address.bit_width =
	ACPI_GPE_REGISTER_WIDTH;
	this_register->status_address.bit_offset = 0;
	this_register->enable_address.bit_offset = 0;

	/* Init the event_info for each GPE within this register */

	for (j = 0; j < ACPI_GPE_REGISTER_WIDTH; j++) {
	this_event->gpe_number =
	(u8) (this_register->base_gpe_number + j);
	this_event->register_info = this_register;
	this_event++;
	}

	/* Disable all GPEs within this register */

	status = acpi_hw_write(0x00, &this_register->enable_address);
	if (ACPI_FAILURE(status)) {
	goto error_exit;
	}

	/* Clear any pending GPE events within this register */

	status = acpi_hw_write(0xFF, &this_register->status_address);
	if (ACPI_FAILURE(status)) {
	goto error_exit;
	}

	this_register++;
	}

	return_ACPI_STATUS(AE_OK);

	error_exit:
	if (gpe_register_info) {
	ACPI_FREE(gpe_register_info);
	}
	if (gpe_event_info) {
	ACPI_FREE(gpe_event_info);
	}

	return_ACPI_STATUS(status);
	}

	/*******************************************************************************
	*
	* FUNCTION: acpi_ev_create_gpe_block
	*
	* PARAMETERS: gpe_device - Handle to the parent GPE block
	* gpe_block_address - Address and space_ID
	* register_count - Number of GPE register pairs in the block
	* gpe_block_base_number - Starting GPE number for the block
	* interrupt_number - H/W interrupt for the block
	* return_gpe_block - Where the new block descriptor is returned
	*
	* RETURN: Status
	*
	* DESCRIPTION: Create and Install a block of GPE registers. All GPEs within
	* the block are disabled at exit.
	* Note: Assumes namespace is locked.
	*
	******************************************************************************/

	acpi_status
	acpi_ev_create_gpe_block(struct acpi_namespace_node *gpe_device,
	struct acpi_generic_address *gpe_block_address,
	u32 register_count,
	u8 gpe_block_base_number,
	u32 interrupt_number,
	struct acpi_gpe_block_info **return_gpe_block)
	{
	acpi_status status;
	struct acpi_gpe_block_info *gpe_block;
	struct acpi_gpe_walk_info walk_info;

	ACPI_FUNCTION_TRACE(ev_create_gpe_block);

	if (!register_count) {
	return_ACPI_STATUS(AE_OK);
	}

	/* Allocate a new GPE block */

	gpe_block = ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_gpe_block_info));
	if (!gpe_block) {
	return_ACPI_STATUS(AE_NO_MEMORY);
	}

	/* Initialize the new GPE block */

	gpe_block->node = gpe_device;
	gpe_block->gpe_count = (u16)(register_count * ACPI_GPE_REGISTER_WIDTH);
	gpe_block->initialized = FALSE;
	gpe_block->register_count = register_count;
	gpe_block->block_base_number = gpe_block_base_number;

	ACPI_MEMCPY(&gpe_block->block_address, gpe_block_address,
	sizeof(struct acpi_generic_address));

	/*
	* Create the register_info and event_info sub-structures
	* Note: disables and clears all GPEs in the block
	*/
	status = acpi_ev_create_gpe_info_blocks(gpe_block);
	if (ACPI_FAILURE(status)) {
	ACPI_FREE(gpe_block);
	return_ACPI_STATUS(status);
	}

	/* Install the new block in the global lists */

	status = acpi_ev_install_gpe_block(gpe_block, interrupt_number);
	if (ACPI_FAILURE(status)) {
	ACPI_FREE(gpe_block->register_info);
	ACPI_FREE(gpe_block->event_info);
	ACPI_FREE(gpe_block);
	return_ACPI_STATUS(status);
	}

	acpi_gbl_all_gpes_initialized = FALSE;

	/* Find all GPE methods (_Lxx or_Exx) for this block */

	walk_info.gpe_block = gpe_block;
	walk_info.gpe_device = gpe_device;
	walk_info.execute_by_owner_id = FALSE;

	status = acpi_ns_walk_namespace(ACPI_TYPE_METHOD, gpe_device,
	ACPI_UINT32_MAX, ACPI_NS_WALK_NO_UNLOCK,
	acpi_ev_match_gpe_method, NULL,
	&walk_info, NULL);

	/* Return the new block */

	if (return_gpe_block) {
	(*return_gpe_block) = gpe_block;
	}

	ACPI_DEBUG_PRINT_RAW((ACPI_DB_INIT,
	" Initialized GPE %02X to %02X [%4.4s] %u regs on interrupt 0x%X\n",
	(u32)gpe_block->block_base_number,
	(u32)(gpe_block->block_base_number +
	(gpe_block->gpe_count - 1)),
	gpe_device->name.ascii, gpe_block->register_count,
	interrupt_number));

	/* Update global count of currently available GPEs */

	acpi_current_gpe_count += gpe_block->gpe_count;
	return_ACPI_STATUS(AE_OK);
	}

	/*******************************************************************************
	*
	* FUNCTION: acpi_ev_initialize_gpe_block
	*
	* PARAMETERS: acpi_gpe_callback
	*
	* RETURN: Status
	*
	* DESCRIPTION: Initialize and enable a GPE block. Enable GPEs that have
	* associated methods.
	* Note: Assumes namespace is locked.
	*
	******************************************************************************/

	acpi_status
	acpi_ev_initialize_gpe_block(struct acpi_gpe_xrupt_info *gpe_xrupt_info,
	struct acpi_gpe_block_info *gpe_block,
	void *ignored)
	{
	acpi_status status;
	struct acpi_gpe_event_info *gpe_event_info;
	u32 gpe_enabled_count;
	u32 gpe_index;
	u32 i;
	u32 j;

	ACPI_FUNCTION_TRACE(ev_initialize_gpe_block);

	/*
	* Ignore a null GPE block (e.g., if no GPE block 1 exists), and
	* any GPE blocks that have been initialized already.
	*/
	if (!gpe_block \|\| gpe_block->initialized) {
	return_ACPI_STATUS(AE_OK);
	}

	/*
	* Enable all GPEs that have a corresponding method and have the
	* ACPI_GPE_CAN_WAKE flag unset. Any other GPEs within this block
	* must be enabled via the acpi_enable_gpe() interface.
	*/
	gpe_enabled_count = 0;

	for (i = 0; i < gpe_block->register_count; i++) {
	for (j = 0; j < ACPI_GPE_REGISTER_WIDTH; j++) {

	/* Get the info block for this particular GPE */

	gpe_index = (i * ACPI_GPE_REGISTER_WIDTH) + j;
	gpe_event_info = &gpe_block->event_info[gpe_index];

	/*
	* Ignore GPEs that have no corresponding _Lxx/_Exx method
	* and GPEs that are used to wake the system
	*/
	if (((gpe_event_info->flags & ACPI_GPE_DISPATCH_MASK) ==
	ACPI_GPE_DISPATCH_NONE)
	\|\| ((gpe_event_info->flags & ACPI_GPE_DISPATCH_MASK)
	== ACPI_GPE_DISPATCH_HANDLER)
	\|\| (gpe_event_info->flags & ACPI_GPE_CAN_WAKE)) {
	continue;
	}

	status = acpi_ev_add_gpe_reference(gpe_event_info);
	if (ACPI_FAILURE(status)) {
	ACPI_EXCEPTION((AE_INFO, status,
	"Could not enable GPE 0x%02X",
	gpe_index +
	gpe_block->block_base_number));
	continue;
	}

	gpe_enabled_count++;
	}
	}

	if (gpe_enabled_count) {
	ACPI_INFO((AE_INFO,
	"Enabled %u GPEs in block %02X to %02X",
	gpe_enabled_count, (u32)gpe_block->block_base_number,
	(u32)(gpe_block->block_base_number +
	(gpe_block->gpe_count - 1))));
	}

	gpe_block->initialized = TRUE;

	return_ACPI_STATUS(AE_OK);
	}

	#endif /* !ACPI_REDUCED_HARDWARE */