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365 lines
8.7 KiB
365 lines
8.7 KiB
// 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 - 2021, 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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