| /****************************************************************************** |
| * |
| * 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 <contrib/dev/acpica/include/acpi.h> |
| #include <contrib/dev/acpica/include/accommon.h> |
| |
| |
| #define _COMPONENT ACPI_HARDWARE |
| ACPI_MODULE_NAME ("hwacpi") |
| |
| |
| #if (!ACPI_REDUCED_HARDWARE) /* Entire module */ |
| /****************************************************************************** |
| * |
| * FUNCTION: AcpiHwSetMode |
| * |
| * PARAMETERS: Mode - SYS_MODE_ACPI or SYS_MODE_LEGACY |
| * |
| * RETURN: Status |
| * |
| * DESCRIPTION: Transitions the system into the requested mode. |
| * |
| ******************************************************************************/ |
| |
| ACPI_STATUS |
| AcpiHwSetMode ( |
| UINT32 Mode) |
| { |
| |
| ACPI_STATUS Status; |
| UINT32 Retry; |
| |
| |
| ACPI_FUNCTION_TRACE (HwSetMode); |
| |
| |
| /* If the Hardware Reduced flag is set, machine is always in acpi mode */ |
| |
| if (AcpiGbl_ReducedHardware) |
| { |
| return_ACPI_STATUS (AE_OK); |
| } |
| |
| /* |
| * ACPI 2.0 clarified that if SMI_CMD in FADT is zero, |
| * system does not support mode transition. |
| */ |
| if (!AcpiGbl_FADT.SmiCommand) |
| { |
| 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 (!AcpiGbl_FADT.AcpiEnable && !AcpiGbl_FADT.AcpiDisable) |
| { |
| 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 = AcpiHwWritePort (AcpiGbl_FADT.SmiCommand, |
| (UINT32) AcpiGbl_FADT.AcpiEnable, 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 = AcpiHwWritePort (AcpiGbl_FADT.SmiCommand, |
| (UINT32) AcpiGbl_FADT.AcpiDisable, 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); |
| } |
| |
| /* |
| * Some hardware takes a LONG time to switch modes. Give them 3 sec to |
| * do so, but allow faster systems to proceed more quickly. |
| */ |
| Retry = 3000; |
| while (Retry) |
| { |
| if (AcpiHwGetMode () == Mode) |
| { |
| ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "Mode %X successfully enabled\n", |
| Mode)); |
| return_ACPI_STATUS (AE_OK); |
| } |
| AcpiOsStall (ACPI_USEC_PER_MSEC); |
| Retry--; |
| } |
| |
| ACPI_ERROR ((AE_INFO, "Hardware did not change modes")); |
| return_ACPI_STATUS (AE_NO_HARDWARE_RESPONSE); |
| } |
| |
| |
| /******************************************************************************* |
| * |
| * FUNCTION: AcpiHwGetMode |
| * |
| * PARAMETERS: none |
| * |
| * RETURN: SYS_MODE_ACPI or SYS_MODE_LEGACY |
| * |
| * DESCRIPTION: Return current operating state of system. Determined by |
| * querying the SCI_EN bit. |
| * |
| ******************************************************************************/ |
| |
| UINT32 |
| AcpiHwGetMode ( |
| void) |
| { |
| ACPI_STATUS Status; |
| UINT32 Value; |
| |
| |
| ACPI_FUNCTION_TRACE (HwGetMode); |
| |
| |
| /* If the Hardware Reduced flag is set, machine is always in acpi mode */ |
| |
| if (AcpiGbl_ReducedHardware) |
| { |
| 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 (!AcpiGbl_FADT.SmiCommand) |
| { |
| return_UINT32 (ACPI_SYS_MODE_ACPI); |
| } |
| |
| Status = AcpiReadBitRegister (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 */ |