hwacpi.c revision 306536
167754Smsmith/****************************************************************************** 267754Smsmith * 371867Smsmith * Module Name: hwacpi - ACPI Hardware Initialization/Mode Interface 467754Smsmith * 567754Smsmith *****************************************************************************/ 667754Smsmith 7217365Sjkim/* 8306536Sjkim * Copyright (C) 2000 - 2016, Intel Corp. 970243Smsmith * All rights reserved. 1067754Smsmith * 11217365Sjkim * Redistribution and use in source and binary forms, with or without 12217365Sjkim * modification, are permitted provided that the following conditions 13217365Sjkim * are met: 14217365Sjkim * 1. Redistributions of source code must retain the above copyright 15217365Sjkim * notice, this list of conditions, and the following disclaimer, 16217365Sjkim * without modification. 17217365Sjkim * 2. Redistributions in binary form must reproduce at minimum a disclaimer 18217365Sjkim * substantially similar to the "NO WARRANTY" disclaimer below 19217365Sjkim * ("Disclaimer") and any redistribution must be conditioned upon 20217365Sjkim * including a substantially similar Disclaimer requirement for further 21217365Sjkim * binary redistribution. 22217365Sjkim * 3. Neither the names of the above-listed copyright holders nor the names 23217365Sjkim * of any contributors may be used to endorse or promote products derived 24217365Sjkim * from this software without specific prior written permission. 2567754Smsmith * 26217365Sjkim * Alternatively, this software may be distributed under the terms of the 27217365Sjkim * GNU General Public License ("GPL") version 2 as published by the Free 28217365Sjkim * Software Foundation. 2967754Smsmith * 30217365Sjkim * NO WARRANTY 31217365Sjkim * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 32217365Sjkim * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 33217365Sjkim * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR 34217365Sjkim * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 35217365Sjkim * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 36217365Sjkim * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 37217365Sjkim * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 38217365Sjkim * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 39217365Sjkim * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING 40217365Sjkim * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 41217365Sjkim * POSSIBILITY OF SUCH DAMAGES. 42217365Sjkim */ 4367754Smsmith 44193341Sjkim#include <contrib/dev/acpica/include/acpi.h> 45193341Sjkim#include <contrib/dev/acpica/include/accommon.h> 4667754Smsmith 4767754Smsmith 4877424Smsmith#define _COMPONENT ACPI_HARDWARE 4991116Smsmith ACPI_MODULE_NAME ("hwacpi") 5067754Smsmith 5167754Smsmith 52231844Sjkim#if (!ACPI_REDUCED_HARDWARE) /* Entire module */ 5367754Smsmith/****************************************************************************** 5467754Smsmith * 5567754Smsmith * FUNCTION: AcpiHwSetMode 5667754Smsmith * 5767754Smsmith * PARAMETERS: Mode - SYS_MODE_ACPI or SYS_MODE_LEGACY 5867754Smsmith * 5967754Smsmith * RETURN: Status 6067754Smsmith * 6191116Smsmith * DESCRIPTION: Transitions the system into the requested mode. 6267754Smsmith * 6367754Smsmith ******************************************************************************/ 6467754Smsmith 6567754SmsmithACPI_STATUS 6667754SmsmithAcpiHwSetMode ( 6767754Smsmith UINT32 Mode) 6867754Smsmith{ 6967754Smsmith 7099679Siwasaki ACPI_STATUS Status; 7199679Siwasaki UINT32 Retry; 7267754Smsmith 7383174Smsmith 74167802Sjkim ACPI_FUNCTION_TRACE (HwSetMode); 7567754Smsmith 76246849Sjkim 77246849Sjkim /* If the Hardware Reduced flag is set, machine is always in acpi mode */ 78246849Sjkim 79246849Sjkim if (AcpiGbl_ReducedHardware) 80246849Sjkim { 81246849Sjkim return_ACPI_STATUS (AE_OK); 82246849Sjkim } 83246849Sjkim 84102550Siwasaki /* 85102550Siwasaki * ACPI 2.0 clarified that if SMI_CMD in FADT is zero, 86102550Siwasaki * system does not support mode transition. 87102550Siwasaki */ 88167802Sjkim if (!AcpiGbl_FADT.SmiCommand) 89102550Siwasaki { 90167802Sjkim ACPI_ERROR ((AE_INFO, "No SMI_CMD in FADT, mode transition failed")); 91102550Siwasaki return_ACPI_STATUS (AE_NO_HARDWARE_RESPONSE); 92102550Siwasaki } 93102550Siwasaki 94102550Siwasaki /* 95102550Siwasaki * ACPI 2.0 clarified the meaning of ACPI_ENABLE and ACPI_DISABLE 96102550Siwasaki * in FADT: If it is zero, enabling or disabling is not supported. 97102550Siwasaki * As old systems may have used zero for mode transition, 98102550Siwasaki * we make sure both the numbers are zero to determine these 99102550Siwasaki * transitions are not supported. 100102550Siwasaki */ 101167802Sjkim if (!AcpiGbl_FADT.AcpiEnable && !AcpiGbl_FADT.AcpiDisable) 102102550Siwasaki { 103167802Sjkim ACPI_ERROR ((AE_INFO, 104193267Sjkim "No ACPI mode transition supported in this system " 105193267Sjkim "(enable/disable both zero)")); 106102550Siwasaki return_ACPI_STATUS (AE_OK); 107102550Siwasaki } 108102550Siwasaki 10999679Siwasaki switch (Mode) 11099679Siwasaki { 11199679Siwasaki case ACPI_SYS_MODE_ACPI: 11267754Smsmith 11367754Smsmith /* BIOS should have disabled ALL fixed and GP events */ 11467754Smsmith 115193267Sjkim Status = AcpiHwWritePort (AcpiGbl_FADT.SmiCommand, 116306536Sjkim (UINT32) AcpiGbl_FADT.AcpiEnable, 8); 11782367Smsmith ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "Attempting to enable ACPI mode\n")); 11899679Siwasaki break; 11999679Siwasaki 12099679Siwasaki case ACPI_SYS_MODE_LEGACY: 12167754Smsmith /* 12267754Smsmith * BIOS should clear all fixed status bits and restore fixed event 12367754Smsmith * enable bits to default 12467754Smsmith */ 125193267Sjkim Status = AcpiHwWritePort (AcpiGbl_FADT.SmiCommand, 126306536Sjkim (UINT32) AcpiGbl_FADT.AcpiDisable, 8); 12782367Smsmith ACPI_DEBUG_PRINT ((ACPI_DB_INFO, 128306536Sjkim "Attempting to enable Legacy (non-ACPI) mode\n")); 12999679Siwasaki break; 13099679Siwasaki 13199679Siwasaki default: 132250838Sjkim 13399679Siwasaki return_ACPI_STATUS (AE_BAD_PARAMETER); 13467754Smsmith } 13567754Smsmith 13699679Siwasaki if (ACPI_FAILURE (Status)) 13799679Siwasaki { 138167802Sjkim ACPI_EXCEPTION ((AE_INFO, Status, 139167802Sjkim "Could not write ACPI mode change")); 14099679Siwasaki return_ACPI_STATUS (Status); 14199679Siwasaki } 14283174Smsmith 14399679Siwasaki /* 14499679Siwasaki * Some hardware takes a LONG time to switch modes. Give them 3 sec to 14599679Siwasaki * do so, but allow faster systems to proceed more quickly. 14699679Siwasaki */ 14799679Siwasaki Retry = 3000; 14899679Siwasaki while (Retry) 14999679Siwasaki { 150245582Sjkim if (AcpiHwGetMode () == Mode) 151102550Siwasaki { 152306536Sjkim ACPI_DEBUG_PRINT ((ACPI_DB_INFO, 153306536Sjkim "Mode %X successfully enabled\n", Mode)); 154123315Snjl return_ACPI_STATUS (AE_OK); 15599679Siwasaki } 156245582Sjkim AcpiOsStall (ACPI_USEC_PER_MSEC); 15799679Siwasaki Retry--; 15867754Smsmith } 15967754Smsmith 160167802Sjkim ACPI_ERROR ((AE_INFO, "Hardware did not change modes")); 161123315Snjl return_ACPI_STATUS (AE_NO_HARDWARE_RESPONSE); 16267754Smsmith} 16367754Smsmith 16467754Smsmith 165151937Sjkim/******************************************************************************* 16667754Smsmith * 16767754Smsmith * FUNCTION: AcpiHwGetMode 16867754Smsmith * 16967754Smsmith * PARAMETERS: none 17067754Smsmith * 17167754Smsmith * RETURN: SYS_MODE_ACPI or SYS_MODE_LEGACY 17267754Smsmith * 173241973Sjkim * DESCRIPTION: Return current operating state of system. Determined by 17467754Smsmith * querying the SCI_EN bit. 17567754Smsmith * 17667754Smsmith ******************************************************************************/ 17767754Smsmith 17867754SmsmithUINT32 179151937SjkimAcpiHwGetMode ( 180151937Sjkim void) 18167754Smsmith{ 18299679Siwasaki ACPI_STATUS Status; 18399679Siwasaki UINT32 Value; 18467754Smsmith 18599679Siwasaki 186167802Sjkim ACPI_FUNCTION_TRACE (HwGetMode); 18767754Smsmith 188123315Snjl 189246849Sjkim /* If the Hardware Reduced flag is set, machine is always in acpi mode */ 190246849Sjkim 191246849Sjkim if (AcpiGbl_ReducedHardware) 192246849Sjkim { 193246849Sjkim return_UINT32 (ACPI_SYS_MODE_ACPI); 194246849Sjkim } 195246849Sjkim 196123315Snjl /* 197123315Snjl * ACPI 2.0 clarified that if SMI_CMD in FADT is zero, 198123315Snjl * system does not support mode transition. 199123315Snjl */ 200167802Sjkim if (!AcpiGbl_FADT.SmiCommand) 201123315Snjl { 202246849Sjkim return_UINT32 (ACPI_SYS_MODE_ACPI); 203123315Snjl } 204123315Snjl 205193267Sjkim Status = AcpiReadBitRegister (ACPI_BITREG_SCI_ENABLE, &Value); 20699679Siwasaki if (ACPI_FAILURE (Status)) 20799679Siwasaki { 208246849Sjkim return_UINT32 (ACPI_SYS_MODE_LEGACY); 20999679Siwasaki } 21067754Smsmith 21199679Siwasaki if (Value) 21267754Smsmith { 213246849Sjkim return_UINT32 (ACPI_SYS_MODE_ACPI); 21467754Smsmith } 21567754Smsmith else 21667754Smsmith { 217246849Sjkim return_UINT32 (ACPI_SYS_MODE_LEGACY); 21867754Smsmith } 21967754Smsmith} 220231844Sjkim 221231844Sjkim#endif /* !ACPI_REDUCED_HARDWARE */ 222