0,0 → 1,181 |
/****************************************************************************** |
* |
* Module Name: hwacpi - ACPI Hardware Initialization/Mode Interface |
* |
*****************************************************************************/ |
|
/* |
* Copyright (C) 2000 - 2015, 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" |
|
#define _COMPONENT ACPI_HARDWARE |
ACPI_MODULE_NAME("hwacpi") |
|
#if (!ACPI_REDUCED_HARDWARE) /* Entire module */ |
/****************************************************************************** |
* |
* FUNCTION: acpi_hw_set_mode |
* |
* PARAMETERS: mode - SYS_MODE_ACPI or SYS_MODE_LEGACY |
* |
* RETURN: Status |
* |
* DESCRIPTION: Transitions the system into the requested mode. |
* |
******************************************************************************/ |
acpi_status acpi_hw_set_mode(u32 mode) |
{ |
|
acpi_status status; |
|
ACPI_FUNCTION_TRACE(hw_set_mode); |
|
/* If the Hardware Reduced flag is set, machine is always in acpi mode */ |
|
if (acpi_gbl_reduced_hardware) { |
return_ACPI_STATUS(AE_OK); |
} |
|
/* |
* ACPI 2.0 clarified that if SMI_CMD in FADT is zero, |
* system does not support mode transition. |
*/ |
if (!acpi_gbl_FADT.smi_command) { |
ACPI_ERROR((AE_INFO, |
"No SMI_CMD in FADT, mode transition failed")); |
return_ACPI_STATUS(AE_NO_HARDWARE_RESPONSE); |
} |
|
/* |
* ACPI 2.0 clarified the meaning of ACPI_ENABLE and ACPI_DISABLE |
* in FADT: If it is zero, enabling or disabling is not supported. |
* As old systems may have used zero for mode transition, |
* we make sure both the numbers are zero to determine these |
* transitions are not supported. |
*/ |
if (!acpi_gbl_FADT.acpi_enable && !acpi_gbl_FADT.acpi_disable) { |
ACPI_ERROR((AE_INFO, |
"No ACPI mode transition supported in this system " |
"(enable/disable both zero)")); |
return_ACPI_STATUS(AE_OK); |
} |
|
switch (mode) { |
case ACPI_SYS_MODE_ACPI: |
|
/* BIOS should have disabled ALL fixed and GP events */ |
|
status = acpi_hw_write_port(acpi_gbl_FADT.smi_command, |
(u32) acpi_gbl_FADT.acpi_enable, 8); |
ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
"Attempting to enable ACPI mode\n")); |
break; |
|
case ACPI_SYS_MODE_LEGACY: |
/* |
* BIOS should clear all fixed status bits and restore fixed event |
* enable bits to default |
*/ |
status = acpi_hw_write_port(acpi_gbl_FADT.smi_command, |
(u32)acpi_gbl_FADT.acpi_disable, 8); |
ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
"Attempting to enable Legacy (non-ACPI) mode\n")); |
break; |
|
default: |
|
return_ACPI_STATUS(AE_BAD_PARAMETER); |
} |
|
if (ACPI_FAILURE(status)) { |
ACPI_EXCEPTION((AE_INFO, status, |
"Could not write ACPI mode change")); |
return_ACPI_STATUS(status); |
} |
|
return_ACPI_STATUS(AE_OK); |
} |
|
/******************************************************************************* |
* |
* FUNCTION: acpi_hw_get_mode |
* |
* PARAMETERS: none |
* |
* RETURN: SYS_MODE_ACPI or SYS_MODE_LEGACY |
* |
* DESCRIPTION: Return current operating state of system. Determined by |
* querying the SCI_EN bit. |
* |
******************************************************************************/ |
|
u32 acpi_hw_get_mode(void) |
{ |
acpi_status status; |
u32 value; |
|
ACPI_FUNCTION_TRACE(hw_get_mode); |
|
/* If the Hardware Reduced flag is set, machine is always in acpi mode */ |
|
if (acpi_gbl_reduced_hardware) { |
return_UINT32(ACPI_SYS_MODE_ACPI); |
} |
|
/* |
* ACPI 2.0 clarified that if SMI_CMD in FADT is zero, |
* system does not support mode transition. |
*/ |
if (!acpi_gbl_FADT.smi_command) { |
return_UINT32(ACPI_SYS_MODE_ACPI); |
} |
|
status = acpi_read_bit_register(ACPI_BITREG_SCI_ENABLE, &value); |
if (ACPI_FAILURE(status)) { |
return_UINT32(ACPI_SYS_MODE_LEGACY); |
} |
|
if (value) { |
return_UINT32(ACPI_SYS_MODE_ACPI); |
} else { |
return_UINT32(ACPI_SYS_MODE_LEGACY); |
} |
} |
|
#endif /* !ACPI_REDUCED_HARDWARE */ |