185 lines
5.6 KiB
C
185 lines
5.6 KiB
C
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/******************************************************************************
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*
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* Module Name: hwacpi - ACPI Hardware Initialization/Mode Interface
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*
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*****************************************************************************/
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/*
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* Copyright (C) 2000 - 2007, R. Byron Moore
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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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#include <acpi/acpi.h>
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#define _COMPONENT ACPI_HARDWARE
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ACPI_MODULE_NAME("hwacpi")
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/******************************************************************************
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*
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* FUNCTION: acpi_hw_set_mode
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*
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* PARAMETERS: Mode - SYS_MODE_ACPI or SYS_MODE_LEGACY
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*
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* RETURN: Status
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*
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* DESCRIPTION: Transitions the system into the requested mode.
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*
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******************************************************************************/
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acpi_status acpi_hw_set_mode(u32 mode)
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{
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acpi_status status;
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u32 retry;
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ACPI_FUNCTION_TRACE(hw_set_mode);
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/*
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* ACPI 2.0 clarified that if SMI_CMD in FADT is zero,
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* system does not support mode transition.
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*/
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if (!acpi_gbl_FADT.smi_command) {
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ACPI_ERROR((AE_INFO,
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"No SMI_CMD in FADT, mode transition failed"));
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return_ACPI_STATUS(AE_NO_HARDWARE_RESPONSE);
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}
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/*
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* ACPI 2.0 clarified the meaning of ACPI_ENABLE and ACPI_DISABLE
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* in FADT: If it is zero, enabling or disabling is not supported.
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* As old systems may have used zero for mode transition,
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* we make sure both the numbers are zero to determine these
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* transitions are not supported.
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*/
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if (!acpi_gbl_FADT.acpi_enable && !acpi_gbl_FADT.acpi_disable) {
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ACPI_ERROR((AE_INFO,
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"No ACPI mode transition supported in this system (enable/disable both zero)"));
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return_ACPI_STATUS(AE_OK);
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}
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switch (mode) {
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case ACPI_SYS_MODE_ACPI:
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/* BIOS should have disabled ALL fixed and GP events */
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status = acpi_os_write_port(acpi_gbl_FADT.smi_command,
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(u32) acpi_gbl_FADT.acpi_enable, 8);
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ACPI_DEBUG_PRINT((ACPI_DB_INFO,
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"Attempting to enable ACPI mode\n"));
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break;
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case ACPI_SYS_MODE_LEGACY:
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/*
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* BIOS should clear all fixed status bits and restore fixed event
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* enable bits to default
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*/
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status = acpi_os_write_port(acpi_gbl_FADT.smi_command,
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(u32) acpi_gbl_FADT.acpi_disable,
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8);
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ACPI_DEBUG_PRINT((ACPI_DB_INFO,
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"Attempting to enable Legacy (non-ACPI) mode\n"));
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break;
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default:
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return_ACPI_STATUS(AE_BAD_PARAMETER);
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}
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if (ACPI_FAILURE(status)) {
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ACPI_EXCEPTION((AE_INFO, status,
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"Could not write ACPI mode change"));
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return_ACPI_STATUS(status);
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}
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/*
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* Some hardware takes a LONG time to switch modes. Give them 3 sec to
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* do so, but allow faster systems to proceed more quickly.
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*/
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retry = 3000;
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while (retry) {
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if (acpi_hw_get_mode() == mode) {
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ACPI_DEBUG_PRINT((ACPI_DB_INFO,
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"Mode %X successfully enabled\n",
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mode));
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return_ACPI_STATUS(AE_OK);
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}
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acpi_os_stall(1000);
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retry--;
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}
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ACPI_ERROR((AE_INFO, "Hardware did not change modes"));
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return_ACPI_STATUS(AE_NO_HARDWARE_RESPONSE);
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_hw_get_mode
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*
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* PARAMETERS: none
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*
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* RETURN: SYS_MODE_ACPI or SYS_MODE_LEGACY
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*
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* DESCRIPTION: Return current operating state of system. Determined by
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* querying the SCI_EN bit.
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*
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******************************************************************************/
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u32 acpi_hw_get_mode(void)
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{
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acpi_status status;
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u32 value;
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ACPI_FUNCTION_TRACE(hw_get_mode);
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/*
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* ACPI 2.0 clarified that if SMI_CMD in FADT is zero,
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* system does not support mode transition.
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*/
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if (!acpi_gbl_FADT.smi_command) {
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return_UINT32(ACPI_SYS_MODE_ACPI);
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}
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status = acpi_get_register(ACPI_BITREG_SCI_ENABLE, &value);
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if (ACPI_FAILURE(status)) {
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return_UINT32(ACPI_SYS_MODE_LEGACY);
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}
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if (value) {
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return_UINT32(ACPI_SYS_MODE_ACPI);
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} else {
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return_UINT32(ACPI_SYS_MODE_LEGACY);
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}
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}
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