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147 lines
3.8 KiB
147 lines
3.8 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: hwacpi - ACPI Hardware Initialization/Mode Interface |
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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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#include <acpi/acpi.h> |
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#include "accommon.h" |
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#define _COMPONENT ACPI_HARDWARE |
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ACPI_MODULE_NAME("hwacpi") |
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#if (!ACPI_REDUCED_HARDWARE) /* Entire module */ |
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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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ACPI_FUNCTION_TRACE(hw_set_mode); |
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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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/* |
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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 " |
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"(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_hw_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_hw_write_port(acpi_gbl_FADT.smi_command, |
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(u32)acpi_gbl_FADT.acpi_disable, 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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return_ACPI_STATUS(AE_OK); |
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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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/* 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_UINT32(ACPI_SYS_MODE_ACPI); |
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} |
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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_read_bit_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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#endif /* !ACPI_REDUCED_HARDWARE */
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