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

/******************************************************************************
 *
 * Module Name: evregion - ACPI address_space (op_region) handler dispatch
 *
 *****************************************************************************/

/*
 * Copyright (C) 2000 - 2012, 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"
#include "acinterp.h"

#define _COMPONENT          ACPI_EVENTS
ACPI_MODULE_NAME("evregion")

/* Local prototypes */
static u8
acpi_ev_has_default_handler(struct acpi_namespace_node *node,
			    acpi_adr_space_type space_id);

static void acpi_ev_orphan_ec_reg_method(void);

static acpi_status
acpi_ev_reg_run(acpi_handle obj_handle,
		u32 level, void *context, void **return_value);

static acpi_status
acpi_ev_install_handler(acpi_handle obj_handle,
			u32 level, void *context, void **return_value);

/* These are the address spaces that will get default handlers */

#define ACPI_NUM_DEFAULT_SPACES     4

static u8 acpi_gbl_default_address_spaces[ACPI_NUM_DEFAULT_SPACES] = {
	ACPI_ADR_SPACE_SYSTEM_MEMORY,
	ACPI_ADR_SPACE_SYSTEM_IO,
	ACPI_ADR_SPACE_PCI_CONFIG,
	ACPI_ADR_SPACE_DATA_TABLE
};

/*******************************************************************************
 *
 * FUNCTION:    acpi_ev_install_region_handlers
 *
 * PARAMETERS:  None
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Installs the core subsystem default address space handlers.
 *
 ******************************************************************************/

acpi_status acpi_ev_install_region_handlers(void)
{
	acpi_status status;
	u32 i;

	ACPI_FUNCTION_TRACE(ev_install_region_handlers);

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

	/*
	 * All address spaces (PCI Config, EC, SMBus) are scope dependent and
	 * registration must occur for a specific device.
	 *
	 * In the case of the system memory and IO address spaces there is
	 * currently no device associated with the address space. For these we
	 * use the root.
	 *
	 * We install the default PCI config space handler at the root so that
	 * this space is immediately available even though the we have not
	 * enumerated all the PCI Root Buses yet. This is to conform to the ACPI
	 * specification which states that the PCI config space must be always
	 * available -- even though we are nowhere near ready to find the PCI root
	 * buses at this point.
	 *
	 * NOTE: We ignore AE_ALREADY_EXISTS because this means that a handler
	 * has already been installed (via acpi_install_address_space_handler).
	 * Similar for AE_SAME_HANDLER.
	 */
	for (i = 0; i < ACPI_NUM_DEFAULT_SPACES; i++) {
		status = acpi_ev_install_space_handler(acpi_gbl_root_node,
						       acpi_gbl_default_address_spaces
						       [i],
						       ACPI_DEFAULT_HANDLER,
						       NULL, NULL);
		switch (status) {
		case AE_OK:
		case AE_SAME_HANDLER:
		case AE_ALREADY_EXISTS:

			/* These exceptions are all OK */

			status = AE_OK;
			break;

		default:

			goto unlock_and_exit;
		}
	}

      unlock_and_exit:
	(void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);