mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-12-25 03:55:09 +08:00
4441e55d50
This affects all ACPICA source code modules. ACPICA commit c570953c914437e621dd5f160f26ddf352e0d2f4 Link: https://github.com/acpica/acpica/commit/c570953c Signed-off-by: Bob Moore <robert.moore@intel.com> Signed-off-by: Erik Kaneda <erik.kaneda@intel.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
148 lines
3.8 KiB
C
148 lines
3.8 KiB
C
// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
|
|
/******************************************************************************
|
|
*
|
|
* Module Name: hwacpi - ACPI Hardware Initialization/Mode Interface
|
|
*
|
|
* Copyright (C) 2000 - 2021, Intel Corp.
|
|
*
|
|
*****************************************************************************/
|
|
|
|
#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 */
|