path: root/drivers/acpi/acpica/evgpeblk.c

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

/*
 * Copyright (C) 2000 - 2010, 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")

/* 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->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);
		return_ACPI_STATUS(status);
	}

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

	walk_info.gpe_block = gpe_block;
	walk_info.gpe_device = gpe_device;
	walk_info.enable_this_gpe = FALSE;
	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((ACPI_DB_INIT,
			  "GPE %02X to %02X [%4.4s] %u regs on int 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:  gpe_device          - Handle to the parent GPE block
 *              gpe_block           - Gpe Block info
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Initialize and enable a GPE block. First find and run any
 *              _PRT methods associated with the block, then enable the
 *              appropriate GPEs.
 *              Note: Assumes namespace is locked.
 *
 ******************************************************************************/

acpi_status
acpi_ev_initialize_gpe_block(struct acpi_namespace_node *gpe_device,
			     struct acpi_gpe_block_info *gpe_block)
{
	acpi_status status;
	struct acpi_gpe_event_info *gpe_event_info;
	struct acpi_gpe_walk_info walk_info;
	u32 wake_gpe_count;
	u32 gpe_enabled_count;
	u32 gpe_index;
	u32 gpe_number;
	u32 i;
	u32 j;

	ACPI_FUNCTION_TRACE(ev_initialize_gpe_block);

	/* Ignore a null GPE block (e.g., if no GPE block 1 exists) */

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

	/*
	 * Runtime option: Should wake GPEs be enabled at runtime?  The default
	 * is no, they should only be enabled just as the machine goes to sleep.
	 */
	if (acpi_gbl_leave_wake_gpes_disabled) {
		/*
		 * Differentiate runtime vs wake GPEs, via the _PRW control methods.
		 * Each GPE that has one or more _PRWs that reference it is by
		 * definition a wake GPE and will not be enabled while the machine
		 * is running.
		 */
		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_DEVICE, ACPI_ROOT_OBJECT,
					   ACPI_UINT32_MAX, ACPI_NS_WALK_UNLOCK,
					   acpi_ev_match_prw_and_gpe, NULL,
					   &walk_info, NULL);
		if (ACPI_FAILURE(status)) {
			ACPI_EXCEPTION((AE_INFO, status,
					"While executing _PRW methods"));
		}
	}

	/*
	 * Enable all GPEs that have a corresponding method and are not
	 * capable of generating wakeups. Any other GPEs within this block
	 * must be enabled via the acpi_enable_gpe interface.
	 */
	wake_gpe_count = 0;
	gpe_enabled_count = 0;

	if (gpe_device == acpi_gbl_fadt_gpe_device) {
		gpe_device = NULL;
	}

	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];
			gpe_number = gpe_index + gpe_block->block_base_number;

			/*
			 * If the GPE has already been enabled for runtime
			 * signaling, make sure it remains enabled, but do not
			 * increment its reference counter.
			 */
			if (gpe_event_info->runtime_count) {
				acpi_set_gpe(gpe_device, gpe_number,
						ACPI_GPE_ENABLE);
				gpe_enabled_count++;
				continue;
			}

			if (gpe_event_info->flags & ACPI_GPE_CAN_WAKE) {
				wake_gpe_count++;
				if (acpi_gbl_leave_wake_gpes_disabled) {
					continue;
				}
			}

			/* Ignore GPEs that have no corresponding _Lxx/_Exx method */

			if (!(gpe_event_info->flags & ACPI_GPE_DISPATCH_METHOD)) {
				continue;
			}

			/* Enable this GPE */

			status = acpi_enable_gpe(gpe_device, gpe_number);
			if (ACPI_FAILURE(status)) {
				ACPI_EXCEPTION((AE_INFO, status,
						"Could not enable GPE 0x%02X",
						gpe_number));
				continue;
			}

			gpe_enabled_count++;
		}
	}

	if (gpe_enabled_count || wake_gpe_count) {
		ACPI_DEBUG_PRINT((ACPI_DB_INIT,
				  "Enabled %u Runtime GPEs, added %u Wake GPEs in this block\n",
				  gpe_enabled_count, wake_gpe_count));
	}

	return_ACPI_STATUS(AE_OK);
}