hwacpi.c revision 229989
171867Smsmith 267754Smsmith/****************************************************************************** 367754Smsmith * 471867Smsmith * Module Name: hwacpi - ACPI Hardware Initialization/Mode Interface 567754Smsmith * 667754Smsmith *****************************************************************************/ 767754Smsmith 8217365Sjkim/* 9229989Sjkim * Copyright (C) 2000 - 2012, Intel Corp. 1070243Smsmith * All rights reserved. 1167754Smsmith * 12217365Sjkim * Redistribution and use in source and binary forms, with or without 13217365Sjkim * modification, are permitted provided that the following conditions 14217365Sjkim * are met: 15217365Sjkim * 1. Redistributions of source code must retain the above copyright 16217365Sjkim * notice, this list of conditions, and the following disclaimer, 17217365Sjkim * without modification. 18217365Sjkim * 2. Redistributions in binary form must reproduce at minimum a disclaimer 19217365Sjkim * substantially similar to the "NO WARRANTY" disclaimer below 20217365Sjkim * ("Disclaimer") and any redistribution must be conditioned upon 21217365Sjkim * including a substantially similar Disclaimer requirement for further 22217365Sjkim * binary redistribution. 23217365Sjkim * 3. Neither the names of the above-listed copyright holders nor the names 24217365Sjkim * of any contributors may be used to endorse or promote products derived 25217365Sjkim * from this software without specific prior written permission. 2667754Smsmith * 27217365Sjkim * Alternatively, this software may be distributed under the terms of the 28217365Sjkim * GNU General Public License ("GPL") version 2 as published by the Free 29217365Sjkim * Software Foundation. 3067754Smsmith * 31217365Sjkim * NO WARRANTY 32217365Sjkim * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 33217365Sjkim * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 34217365Sjkim * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR 35217365Sjkim * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 36217365Sjkim * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 37217365Sjkim * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 38217365Sjkim * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 39217365Sjkim * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 40217365Sjkim * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING 41217365Sjkim * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 42217365Sjkim * POSSIBILITY OF SUCH DAMAGES. 43217365Sjkim */ 4467754Smsmith 4567754Smsmith#define __HWACPI_C__ 4667754Smsmith 47193341Sjkim#include <contrib/dev/acpica/include/acpi.h> 48193341Sjkim#include <contrib/dev/acpica/include/accommon.h> 4967754Smsmith 5067754Smsmith 5177424Smsmith#define _COMPONENT ACPI_HARDWARE 5291116Smsmith ACPI_MODULE_NAME ("hwacpi") 5367754Smsmith 5467754Smsmith 5567754Smsmith/****************************************************************************** 5667754Smsmith * 5767754Smsmith * FUNCTION: AcpiHwSetMode 5867754Smsmith * 5967754Smsmith * PARAMETERS: Mode - SYS_MODE_ACPI or SYS_MODE_LEGACY 6067754Smsmith * 6167754Smsmith * RETURN: Status 6267754Smsmith * 6391116Smsmith * DESCRIPTION: Transitions the system into the requested mode. 6467754Smsmith * 6567754Smsmith ******************************************************************************/ 6667754Smsmith 6767754SmsmithACPI_STATUS 6867754SmsmithAcpiHwSetMode ( 6967754Smsmith UINT32 Mode) 7067754Smsmith{ 7167754Smsmith 7299679Siwasaki ACPI_STATUS Status; 7399679Siwasaki UINT32 Retry; 7467754Smsmith 7583174Smsmith 76167802Sjkim ACPI_FUNCTION_TRACE (HwSetMode); 7767754Smsmith 78102550Siwasaki /* 79102550Siwasaki * ACPI 2.0 clarified that if SMI_CMD in FADT is zero, 80102550Siwasaki * system does not support mode transition. 81102550Siwasaki */ 82167802Sjkim if (!AcpiGbl_FADT.SmiCommand) 83102550Siwasaki { 84167802Sjkim ACPI_ERROR ((AE_INFO, "No SMI_CMD in FADT, mode transition failed")); 85102550Siwasaki return_ACPI_STATUS (AE_NO_HARDWARE_RESPONSE); 86102550Siwasaki } 87102550Siwasaki 88102550Siwasaki /* 89102550Siwasaki * ACPI 2.0 clarified the meaning of ACPI_ENABLE and ACPI_DISABLE 90102550Siwasaki * in FADT: If it is zero, enabling or disabling is not supported. 91102550Siwasaki * As old systems may have used zero for mode transition, 92102550Siwasaki * we make sure both the numbers are zero to determine these 93102550Siwasaki * transitions are not supported. 94102550Siwasaki */ 95167802Sjkim if (!AcpiGbl_FADT.AcpiEnable && !AcpiGbl_FADT.AcpiDisable) 96102550Siwasaki { 97167802Sjkim ACPI_ERROR ((AE_INFO, 98193267Sjkim "No ACPI mode transition supported in this system " 99193267Sjkim "(enable/disable both zero)")); 100102550Siwasaki return_ACPI_STATUS (AE_OK); 101102550Siwasaki } 102102550Siwasaki 10399679Siwasaki switch (Mode) 10499679Siwasaki { 10599679Siwasaki case ACPI_SYS_MODE_ACPI: 10667754Smsmith 10767754Smsmith /* BIOS should have disabled ALL fixed and GP events */ 10867754Smsmith 109193267Sjkim Status = AcpiHwWritePort (AcpiGbl_FADT.SmiCommand, 110167802Sjkim (UINT32) AcpiGbl_FADT.AcpiEnable, 8); 11182367Smsmith ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "Attempting to enable ACPI mode\n")); 11299679Siwasaki break; 11399679Siwasaki 11499679Siwasaki case ACPI_SYS_MODE_LEGACY: 11599679Siwasaki 11667754Smsmith /* 11767754Smsmith * BIOS should clear all fixed status bits and restore fixed event 11867754Smsmith * enable bits to default 11967754Smsmith */ 120193267Sjkim Status = AcpiHwWritePort (AcpiGbl_FADT.SmiCommand, 121167802Sjkim (UINT32) AcpiGbl_FADT.AcpiDisable, 8); 12282367Smsmith ACPI_DEBUG_PRINT ((ACPI_DB_INFO, 12382367Smsmith "Attempting to enable Legacy (non-ACPI) mode\n")); 12499679Siwasaki break; 12599679Siwasaki 12699679Siwasaki default: 12799679Siwasaki return_ACPI_STATUS (AE_BAD_PARAMETER); 12867754Smsmith } 12967754Smsmith 13099679Siwasaki if (ACPI_FAILURE (Status)) 13199679Siwasaki { 132167802Sjkim ACPI_EXCEPTION ((AE_INFO, Status, 133167802Sjkim "Could not write ACPI mode change")); 13499679Siwasaki return_ACPI_STATUS (Status); 13599679Siwasaki } 13683174Smsmith 13799679Siwasaki /* 13899679Siwasaki * Some hardware takes a LONG time to switch modes. Give them 3 sec to 13999679Siwasaki * do so, but allow faster systems to proceed more quickly. 14099679Siwasaki */ 14199679Siwasaki Retry = 3000; 14299679Siwasaki while (Retry) 14399679Siwasaki { 144102550Siwasaki if (AcpiHwGetMode() == Mode) 145102550Siwasaki { 146151937Sjkim ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "Mode %X successfully enabled\n", 147151937Sjkim Mode)); 148123315Snjl return_ACPI_STATUS (AE_OK); 14999679Siwasaki } 150102550Siwasaki AcpiOsStall(1000); 15199679Siwasaki Retry--; 15267754Smsmith } 15367754Smsmith 154167802Sjkim ACPI_ERROR ((AE_INFO, "Hardware did not change modes")); 155123315Snjl return_ACPI_STATUS (AE_NO_HARDWARE_RESPONSE); 15667754Smsmith} 15767754Smsmith 15867754Smsmith 159151937Sjkim/******************************************************************************* 16067754Smsmith * 16167754Smsmith * FUNCTION: AcpiHwGetMode 16267754Smsmith * 16367754Smsmith * PARAMETERS: none 16467754Smsmith * 16567754Smsmith * RETURN: SYS_MODE_ACPI or SYS_MODE_LEGACY 16667754Smsmith * 16767754Smsmith * DESCRIPTION: Return current operating state of system. Determined by 16867754Smsmith * querying the SCI_EN bit. 16967754Smsmith * 17067754Smsmith ******************************************************************************/ 17167754Smsmith 17267754SmsmithUINT32 173151937SjkimAcpiHwGetMode ( 174151937Sjkim void) 17567754Smsmith{ 17699679Siwasaki ACPI_STATUS Status; 17799679Siwasaki UINT32 Value; 17867754Smsmith 17999679Siwasaki 180167802Sjkim ACPI_FUNCTION_TRACE (HwGetMode); 18167754Smsmith 182123315Snjl 183123315Snjl /* 184123315Snjl * ACPI 2.0 clarified that if SMI_CMD in FADT is zero, 185123315Snjl * system does not support mode transition. 186123315Snjl */ 187167802Sjkim if (!AcpiGbl_FADT.SmiCommand) 188123315Snjl { 189151937Sjkim return_UINT32 (ACPI_SYS_MODE_ACPI); 190123315Snjl } 191123315Snjl 192193267Sjkim Status = AcpiReadBitRegister (ACPI_BITREG_SCI_ENABLE, &Value); 19399679Siwasaki if (ACPI_FAILURE (Status)) 19499679Siwasaki { 195151937Sjkim return_UINT32 (ACPI_SYS_MODE_LEGACY); 19699679Siwasaki } 19767754Smsmith 19899679Siwasaki if (Value) 19967754Smsmith { 200151937Sjkim return_UINT32 (ACPI_SYS_MODE_ACPI); 20167754Smsmith } 20267754Smsmith else 20367754Smsmith { 204151937Sjkim return_UINT32 (ACPI_SYS_MODE_LEGACY); 20567754Smsmith } 20667754Smsmith} 207