366 lines
8.7 KiB
C
366 lines
8.7 KiB
C
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// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
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/******************************************************************************
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*
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* Module Name: evxfevnt - External Interfaces, ACPI event disable/enable
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*
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* Copyright (C) 2000 - 2019, Intel Corp.
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*
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*****************************************************************************/
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#define EXPORT_ACPI_INTERFACES
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#include <acpi/acpi.h>
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#include "accommon.h"
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#include "actables.h"
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#define _COMPONENT ACPI_EVENTS
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ACPI_MODULE_NAME("evxfevnt")
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#if (!ACPI_REDUCED_HARDWARE) /* Entire module */
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/*******************************************************************************
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*
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* FUNCTION: acpi_enable
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*
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* PARAMETERS: None
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*
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* RETURN: Status
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*
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* DESCRIPTION: Transfers the system into ACPI mode.
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*
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******************************************************************************/
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acpi_status acpi_enable(void)
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{
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acpi_status status;
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int retry;
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ACPI_FUNCTION_TRACE(acpi_enable);
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/* ACPI tables must be present */
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if (acpi_gbl_fadt_index == ACPI_INVALID_TABLE_INDEX) {
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return_ACPI_STATUS(AE_NO_ACPI_TABLES);
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}
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/* If the Hardware Reduced flag is set, machine is always in acpi mode */
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if (acpi_gbl_reduced_hardware) {
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return_ACPI_STATUS(AE_OK);
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}
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/* Check current mode */
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if (acpi_hw_get_mode() == ACPI_SYS_MODE_ACPI) {
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ACPI_DEBUG_PRINT((ACPI_DB_INIT,
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"System is already in ACPI mode\n"));
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return_ACPI_STATUS(AE_OK);
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}
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/* Transition to ACPI mode */
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status = acpi_hw_set_mode(ACPI_SYS_MODE_ACPI);
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if (ACPI_FAILURE(status)) {
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ACPI_ERROR((AE_INFO,
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"Could not transition to ACPI mode"));
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return_ACPI_STATUS(status);
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}
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/* Sanity check that transition succeeded */
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for (retry = 0; retry < 30000; ++retry) {
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if (acpi_hw_get_mode() == ACPI_SYS_MODE_ACPI) {
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if (retry != 0)
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ACPI_WARNING((AE_INFO,
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"Platform took > %d00 usec to enter ACPI mode", retry));
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return_ACPI_STATUS(AE_OK);
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}
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acpi_os_stall(100); /* 100 usec */
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}
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ACPI_ERROR((AE_INFO, "Hardware did not enter ACPI mode"));
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return_ACPI_STATUS(AE_NO_HARDWARE_RESPONSE);
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}
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ACPI_EXPORT_SYMBOL(acpi_enable)
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/*******************************************************************************
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*
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* FUNCTION: acpi_disable
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*
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* PARAMETERS: None
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*
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* RETURN: Status
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*
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* DESCRIPTION: Transfers the system into LEGACY (non-ACPI) mode.
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*
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******************************************************************************/
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acpi_status acpi_disable(void)
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{
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acpi_status status = AE_OK;
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ACPI_FUNCTION_TRACE(acpi_disable);
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/* If the Hardware Reduced flag is set, machine is always in acpi mode */
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if (acpi_gbl_reduced_hardware) {
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return_ACPI_STATUS(AE_OK);
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}
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if (acpi_hw_get_mode() == ACPI_SYS_MODE_LEGACY) {
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ACPI_DEBUG_PRINT((ACPI_DB_INIT,
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"System is already in legacy (non-ACPI) mode\n"));
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} else {
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/* Transition to LEGACY mode */
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status = acpi_hw_set_mode(ACPI_SYS_MODE_LEGACY);
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if (ACPI_FAILURE(status)) {
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ACPI_ERROR((AE_INFO,
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"Could not exit ACPI mode to legacy mode"));
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return_ACPI_STATUS(status);
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}
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ACPI_DEBUG_PRINT((ACPI_DB_INIT, "ACPI mode disabled\n"));
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}
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return_ACPI_STATUS(status);
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}
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ACPI_EXPORT_SYMBOL(acpi_disable)
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/*******************************************************************************
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*
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* FUNCTION: acpi_enable_event
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*
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* PARAMETERS: event - The fixed eventto be enabled
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* flags - Reserved
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*
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* RETURN: Status
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*
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* DESCRIPTION: Enable an ACPI event (fixed)
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*
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******************************************************************************/
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acpi_status acpi_enable_event(u32 event, u32 flags)
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{
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acpi_status status = AE_OK;
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u32 value;
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ACPI_FUNCTION_TRACE(acpi_enable_event);
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/* If Hardware Reduced flag is set, there are no fixed events */
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if (acpi_gbl_reduced_hardware) {
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return_ACPI_STATUS(AE_OK);
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}
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/* Decode the Fixed Event */
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if (event > ACPI_EVENT_MAX) {
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return_ACPI_STATUS(AE_BAD_PARAMETER);
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}
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/*
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* Enable the requested fixed event (by writing a one to the enable
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* register bit)
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*/
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status =
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acpi_write_bit_register(acpi_gbl_fixed_event_info[event].
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enable_register_id, ACPI_ENABLE_EVENT);
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if (ACPI_FAILURE(status)) {
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return_ACPI_STATUS(status);
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}
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/* Make sure that the hardware responded */
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status =
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acpi_read_bit_register(acpi_gbl_fixed_event_info[event].
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enable_register_id, &value);
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if (ACPI_FAILURE(status)) {
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return_ACPI_STATUS(status);
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}
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if (value != 1) {
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ACPI_ERROR((AE_INFO,
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"Could not enable %s event",
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acpi_ut_get_event_name(event)));
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return_ACPI_STATUS(AE_NO_HARDWARE_RESPONSE);
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}
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return_ACPI_STATUS(status);
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}
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ACPI_EXPORT_SYMBOL(acpi_enable_event)
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/*******************************************************************************
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*
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* FUNCTION: acpi_disable_event
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*
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* PARAMETERS: event - The fixed event to be disabled
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* flags - Reserved
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*
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* RETURN: Status
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*
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* DESCRIPTION: Disable an ACPI event (fixed)
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*
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******************************************************************************/
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acpi_status acpi_disable_event(u32 event, u32 flags)
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{
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acpi_status status = AE_OK;
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u32 value;
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ACPI_FUNCTION_TRACE(acpi_disable_event);
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/* If Hardware Reduced flag is set, there are no fixed events */
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if (acpi_gbl_reduced_hardware) {
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return_ACPI_STATUS(AE_OK);
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}
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/* Decode the Fixed Event */
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if (event > ACPI_EVENT_MAX) {
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return_ACPI_STATUS(AE_BAD_PARAMETER);
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}
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/*
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* Disable the requested fixed event (by writing a zero to the enable
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* register bit)
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*/
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status =
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acpi_write_bit_register(acpi_gbl_fixed_event_info[event].
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enable_register_id, ACPI_DISABLE_EVENT);
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if (ACPI_FAILURE(status)) {
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return_ACPI_STATUS(status);
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}
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status =
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acpi_read_bit_register(acpi_gbl_fixed_event_info[event].
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enable_register_id, &value);
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if (ACPI_FAILURE(status)) {
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return_ACPI_STATUS(status);
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}
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if (value != 0) {
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ACPI_ERROR((AE_INFO,
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"Could not disable %s events",
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acpi_ut_get_event_name(event)));
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return_ACPI_STATUS(AE_NO_HARDWARE_RESPONSE);
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}
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return_ACPI_STATUS(status);
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}
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ACPI_EXPORT_SYMBOL(acpi_disable_event)
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/*******************************************************************************
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*
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* FUNCTION: acpi_clear_event
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*
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* PARAMETERS: event - The fixed event to be cleared
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*
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* RETURN: Status
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*
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* DESCRIPTION: Clear an ACPI event (fixed)
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*
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******************************************************************************/
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acpi_status acpi_clear_event(u32 event)
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{
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acpi_status status = AE_OK;
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ACPI_FUNCTION_TRACE(acpi_clear_event);
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/* If Hardware Reduced flag is set, there are no fixed events */
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if (acpi_gbl_reduced_hardware) {
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return_ACPI_STATUS(AE_OK);
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}
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/* Decode the Fixed Event */
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if (event > ACPI_EVENT_MAX) {
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return_ACPI_STATUS(AE_BAD_PARAMETER);
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}
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/*
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* Clear the requested fixed event (By writing a one to the status
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* register bit)
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*/
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status =
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acpi_write_bit_register(acpi_gbl_fixed_event_info[event].
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status_register_id, ACPI_CLEAR_STATUS);
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return_ACPI_STATUS(status);
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}
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ACPI_EXPORT_SYMBOL(acpi_clear_event)
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/*******************************************************************************
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*
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* FUNCTION: acpi_get_event_status
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*
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* PARAMETERS: event - The fixed event
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* event_status - Where the current status of the event will
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* be returned
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*
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* RETURN: Status
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*
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* DESCRIPTION: Obtains and returns the current status of the event
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*
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******************************************************************************/
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acpi_status acpi_get_event_status(u32 event, acpi_event_status * event_status)
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{
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acpi_status status;
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acpi_event_status local_event_status = 0;
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u32 in_byte;
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ACPI_FUNCTION_TRACE(acpi_get_event_status);
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if (!event_status) {
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return_ACPI_STATUS(AE_BAD_PARAMETER);
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}
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/* Decode the Fixed Event */
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if (event > ACPI_EVENT_MAX) {
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return_ACPI_STATUS(AE_BAD_PARAMETER);
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}
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/* Fixed event currently can be dispatched? */
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if (acpi_gbl_fixed_event_handlers[event].handler) {
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local_event_status |= ACPI_EVENT_FLAG_HAS_HANDLER;
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}
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/* Fixed event currently enabled? */
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status =
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acpi_read_bit_register(acpi_gbl_fixed_event_info[event].
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enable_register_id, &in_byte);
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if (ACPI_FAILURE(status)) {
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return_ACPI_STATUS(status);
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}
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if (in_byte) {
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local_event_status |=
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(ACPI_EVENT_FLAG_ENABLED | ACPI_EVENT_FLAG_ENABLE_SET);
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}
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/* Fixed event currently active? */
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status =
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acpi_read_bit_register(acpi_gbl_fixed_event_info[event].
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status_register_id, &in_byte);
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if (ACPI_FAILURE(status)) {
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return_ACPI_STATUS(status);
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}
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if (in_byte) {
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local_event_status |= ACPI_EVENT_FLAG_STATUS_SET;
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}
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(*event_status) = local_event_status;
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return_ACPI_STATUS(AE_OK);
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}
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ACPI_EXPORT_SYMBOL(acpi_get_event_status)
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#endif /* !ACPI_REDUCED_HARDWARE */
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