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09af8e8290
ACPICA commit e25d791e4b3d5b9f4ead298269610cb05f89749a There is a facility in Linux, developers can obtain GPE and fixed event status via /sys/firmware/interrupts/. This is implemented using acpi_get_event_status() and acpi_get_gpe_status(). Recently while debugging some GPE race issues, it is found that the facility is lacking in the ability to obtain real hardware register values, the confusing information makes debugging difficult. This patch modifies acpi_get_gpe_status() to return EN register values to fix this gap. Then flags returned from acpi_get_event_status() and acpi_get_gpe_status() are also cleaned up to reflect this change. The old ACPI_EVENT_FLAG_SET is carefully kept to avoid regressions. It can be deleted after we can make sure all its references are removed from OSPM code. Lv Zheng. Link: https://github.com/acpica/acpica/commit/e25d791e Signed-off-by: Lv Zheng <lv.zheng@intel.com> Signed-off-by: Bob Moore <robert.moore@intel.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
382 lines
10 KiB
C
382 lines
10 KiB
C
/******************************************************************************
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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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*****************************************************************************/
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/*
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* Copyright (C) 2000 - 2015, Intel Corp.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions, and the following disclaimer,
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* without modification.
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* 2. Redistributions in binary form must reproduce at minimum a disclaimer
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* substantially similar to the "NO WARRANTY" disclaimer below
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* ("Disclaimer") and any redistribution must be conditioned upon
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* including a substantially similar Disclaimer requirement for further
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* binary redistribution.
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* 3. Neither the names of the above-listed copyright holders nor the names
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* of any contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* Alternatively, this software may be distributed under the terms of the
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* GNU General Public License ("GPL") version 2 as published by the Free
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* Software Foundation.
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*
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* NO WARRANTY
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGES.
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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_tb_tables_loaded()) {
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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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/* 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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/* 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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/* 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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