hwacpi.c revision 193341
1113280Sjake 2113280Sjake/****************************************************************************** 3113280Sjake * 4113280Sjake * Module Name: hwacpi - ACPI Hardware Initialization/Mode Interface 5113280Sjake * 6113280Sjake *****************************************************************************/ 7113280Sjake 8113280Sjake/****************************************************************************** 9113280Sjake * 10113280Sjake * 1. Copyright Notice 11113280Sjake * 12113280Sjake * Some or all of this work - Copyright (c) 1999 - 2009, Intel Corp. 13113280Sjake * All rights reserved. 14113280Sjake * 15113280Sjake * 2. License 16113280Sjake * 17113280Sjake * 2.1. This is your license from Intel Corp. under its intellectual property 18113280Sjake * rights. You may have additional license terms from the party that provided 19113280Sjake * you this software, covering your right to use that party's intellectual 20113280Sjake * property rights. 21113280Sjake * 22113280Sjake * 2.2. Intel grants, free of charge, to any person ("Licensee") obtaining a 23113280Sjake * copy of the source code appearing in this file ("Covered Code") an 24113280Sjake * irrevocable, perpetual, worldwide license under Intel's copyrights in the 25113280Sjake * base code distributed originally by Intel ("Original Intel Code") to copy, 26113280Sjake * make derivatives, distribute, use and display any portion of the Covered 27113280Sjake * Code in any form, with the right to sublicense such rights; and 28113280Sjake * 29113280Sjake * 2.3. Intel grants Licensee a non-exclusive and non-transferable patent 30113280Sjake * license (with the right to sublicense), under only those claims of Intel 31113280Sjake * patents that are infringed by the Original Intel Code, to make, use, sell, 32113280Sjake * offer to sell, and import the Covered Code and derivative works thereof 33113280Sjake * solely to the minimum extent necessary to exercise the above copyright 34113280Sjake * license, and in no event shall the patent license extend to any additions 35113280Sjake * to or modifications of the Original Intel Code. No other license or right 36113280Sjake * is granted directly or by implication, estoppel or otherwise; 37113280Sjake * 38113280Sjake * The above copyright and patent license is granted only if the following 39131635Sru * conditions are met: 40113280Sjake * 41115392Sru * 3. Conditions 42113280Sjake * 43113280Sjake * 3.1. Redistribution of Source with Rights to Further Distribute Source. 44115392Sru * Redistribution of source code of any substantial portion of the Covered 45113280Sjake * Code or modification with rights to further distribute source must include 46113280Sjake * the above Copyright Notice, the above License, this list of Conditions, 47113280Sjake * and the following Disclaimer and Export Compliance provision. In addition, 48113280Sjake * Licensee must cause all Covered Code to which Licensee contributes to 49113280Sjake * contain a file documenting the changes Licensee made to create that Covered 50113280Sjake * Code and the date of any change. Licensee must include in that file the 51113280Sjake * documentation of any changes made by any predecessor Licensee. Licensee 52113280Sjake * must include a prominent statement that the modification is derived, 53115392Sru * directly or indirectly, from Original Intel Code. 54113280Sjake * 55113280Sjake * 3.2. Redistribution of Source with no Rights to Further Distribute Source. 56113280Sjake * Redistribution of source code of any substantial portion of the Covered 57113280Sjake * Code or modification without rights to further distribute source must 58113280Sjake * include the following Disclaimer and Export Compliance provision in the 59113280Sjake * documentation and/or other materials provided with distribution. In 60115392Sru * addition, Licensee may not authorize further sublicense of source of any 61115392Sru * portion of the Covered Code, and must include terms to the effect that the 62117011Sru * license from Licensee to its licensee is limited to the intellectual 63117011Sru * property embodied in the software Licensee provides to its licensee, and 64113280Sjake * not to intellectual property embodied in modifications its licensee may 65113280Sjake * make. 66115392Sru * 67113280Sjake * 3.3. Redistribution of Executable. Redistribution in executable form of any 68121229Ssimon * substantial portion of the Covered Code or modification must reproduce the 69121229Ssimon * above Copyright Notice, and the following Disclaimer and Export Compliance 70113280Sjake * provision in the documentation and/or other materials provided with the 71113280Sjake * distribution. 72113280Sjake * 73113280Sjake * 3.4. Intel retains all right, title, and interest in and to the Original 74115392Sru * Intel Code. 75113280Sjake * 76113280Sjake * 3.5. Neither the name Intel nor any other trademark owned or controlled by 77115392Sru * Intel shall be used in advertising or otherwise to promote the sale, use or 78113280Sjake * other dealings in products derived from or relating to the Covered Code 79113280Sjake * without prior written authorization from Intel. 80113280Sjake * 81113280Sjake * 4. Disclaimer and Export Compliance 82113280Sjake * 83113280Sjake * 4.1. INTEL MAKES NO WARRANTY OF ANY KIND REGARDING ANY SOFTWARE PROVIDED 84115392Sru * HERE. ANY SOFTWARE ORIGINATING FROM INTEL OR DERIVED FROM INTEL SOFTWARE 85113280Sjake * IS PROVIDED "AS IS," AND INTEL WILL NOT PROVIDE ANY SUPPORT, ASSISTANCE, 86113280Sjake * INSTALLATION, TRAINING OR OTHER SERVICES. INTEL WILL NOT PROVIDE ANY 87113280Sjake * UPDATES, ENHANCEMENTS OR EXTENSIONS. INTEL SPECIFICALLY DISCLAIMS ANY 88113280Sjake * IMPLIED WARRANTIES OF MERCHANTABILITY, NONINFRINGEMENT AND FITNESS FOR A 89113280Sjake * PARTICULAR PURPOSE. 90113280Sjake * 91113302Sjake * 4.2. IN NO EVENT SHALL INTEL HAVE ANY LIABILITY TO LICENSEE, ITS LICENSEES 92113302Sjake * OR ANY OTHER THIRD PARTY, FOR ANY LOST PROFITS, LOST DATA, LOSS OF USE OR 93115392Sru * COSTS OF PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES, OR FOR ANY INDIRECT, 94113280Sjake * SPECIAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THIS AGREEMENT, UNDER ANY 95113280Sjake * CAUSE OF ACTION OR THEORY OF LIABILITY, AND IRRESPECTIVE OF WHETHER INTEL 96113280Sjake * HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES. THESE LIMITATIONS 97115392Sru * SHALL APPLY NOTWITHSTANDING THE FAILURE OF THE ESSENTIAL PURPOSE OF ANY 98113280Sjake * LIMITED REMEDY. 99115392Sru * 100113280Sjake * 4.3. Licensee shall not export, either directly or indirectly, any of this 101113280Sjake * software or system incorporating such software without first obtaining any 102115392Sru * required license or other approval from the U. S. Department of Commerce or 103113280Sjake * any other agency or department of the United States Government. In the 104113280Sjake * event Licensee exports any such software from the United States or 105113280Sjake * re-exports any such software from a foreign destination, Licensee shall 106113280Sjake * ensure that the distribution and export/re-export of the software is in 107130857Smpp * compliance with all laws, regulations, orders, or other restrictions of the 108113280Sjake * U.S. Export Administration Regulations. Licensee agrees that neither it nor 109113280Sjake * any of its subsidiaries will export/re-export any technical data, process, 110113280Sjake * software, or service, directly or indirectly, to any country for which the 111113280Sjake * United States government or any agency thereof requires an export license, 112113280Sjake * other governmental approval, or letter of assurance, without first obtaining 113113280Sjake * such license, approval or letter. 114113280Sjake * 115113280Sjake *****************************************************************************/ 116113280Sjake 117115392Sru#define __HWACPI_C__ 118113280Sjake 119113280Sjake#include <contrib/dev/acpica/include/acpi.h> 120115392Sru#include <contrib/dev/acpica/include/accommon.h> 121115392Sru 122115392Sru 123113280Sjake#define _COMPONENT ACPI_HARDWARE 124113280Sjake ACPI_MODULE_NAME ("hwacpi") 125113280Sjake 126113280Sjake 127113280Sjake/****************************************************************************** 128 * 129 * FUNCTION: AcpiHwSetMode 130 * 131 * PARAMETERS: Mode - SYS_MODE_ACPI or SYS_MODE_LEGACY 132 * 133 * RETURN: Status 134 * 135 * DESCRIPTION: Transitions the system into the requested mode. 136 * 137 ******************************************************************************/ 138 139ACPI_STATUS 140AcpiHwSetMode ( 141 UINT32 Mode) 142{ 143 144 ACPI_STATUS Status; 145 UINT32 Retry; 146 147 148 ACPI_FUNCTION_TRACE (HwSetMode); 149 150 /* 151 * ACPI 2.0 clarified that if SMI_CMD in FADT is zero, 152 * system does not support mode transition. 153 */ 154 if (!AcpiGbl_FADT.SmiCommand) 155 { 156 ACPI_ERROR ((AE_INFO, "No SMI_CMD in FADT, mode transition failed")); 157 return_ACPI_STATUS (AE_NO_HARDWARE_RESPONSE); 158 } 159 160 /* 161 * ACPI 2.0 clarified the meaning of ACPI_ENABLE and ACPI_DISABLE 162 * in FADT: If it is zero, enabling or disabling is not supported. 163 * As old systems may have used zero for mode transition, 164 * we make sure both the numbers are zero to determine these 165 * transitions are not supported. 166 */ 167 if (!AcpiGbl_FADT.AcpiEnable && !AcpiGbl_FADT.AcpiDisable) 168 { 169 ACPI_ERROR ((AE_INFO, 170 "No ACPI mode transition supported in this system " 171 "(enable/disable both zero)")); 172 return_ACPI_STATUS (AE_OK); 173 } 174 175 switch (Mode) 176 { 177 case ACPI_SYS_MODE_ACPI: 178 179 /* BIOS should have disabled ALL fixed and GP events */ 180 181 Status = AcpiHwWritePort (AcpiGbl_FADT.SmiCommand, 182 (UINT32) AcpiGbl_FADT.AcpiEnable, 8); 183 ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "Attempting to enable ACPI mode\n")); 184 break; 185 186 case ACPI_SYS_MODE_LEGACY: 187 188 /* 189 * BIOS should clear all fixed status bits and restore fixed event 190 * enable bits to default 191 */ 192 Status = AcpiHwWritePort (AcpiGbl_FADT.SmiCommand, 193 (UINT32) AcpiGbl_FADT.AcpiDisable, 8); 194 ACPI_DEBUG_PRINT ((ACPI_DB_INFO, 195 "Attempting to enable Legacy (non-ACPI) mode\n")); 196 break; 197 198 default: 199 return_ACPI_STATUS (AE_BAD_PARAMETER); 200 } 201 202 if (ACPI_FAILURE (Status)) 203 { 204 ACPI_EXCEPTION ((AE_INFO, Status, 205 "Could not write ACPI mode change")); 206 return_ACPI_STATUS (Status); 207 } 208 209 /* 210 * Some hardware takes a LONG time to switch modes. Give them 3 sec to 211 * do so, but allow faster systems to proceed more quickly. 212 */ 213 Retry = 3000; 214 while (Retry) 215 { 216 if (AcpiHwGetMode() == Mode) 217 { 218 ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "Mode %X successfully enabled\n", 219 Mode)); 220 return_ACPI_STATUS (AE_OK); 221 } 222 AcpiOsStall(1000); 223 Retry--; 224 } 225 226 ACPI_ERROR ((AE_INFO, "Hardware did not change modes")); 227 return_ACPI_STATUS (AE_NO_HARDWARE_RESPONSE); 228} 229 230 231/******************************************************************************* 232 * 233 * FUNCTION: AcpiHwGetMode 234 * 235 * PARAMETERS: none 236 * 237 * RETURN: SYS_MODE_ACPI or SYS_MODE_LEGACY 238 * 239 * DESCRIPTION: Return current operating state of system. Determined by 240 * querying the SCI_EN bit. 241 * 242 ******************************************************************************/ 243 244UINT32 245AcpiHwGetMode ( 246 void) 247{ 248 ACPI_STATUS Status; 249 UINT32 Value; 250 251 252 ACPI_FUNCTION_TRACE (HwGetMode); 253 254 255 /* 256 * ACPI 2.0 clarified that if SMI_CMD in FADT is zero, 257 * system does not support mode transition. 258 */ 259 if (!AcpiGbl_FADT.SmiCommand) 260 { 261 return_UINT32 (ACPI_SYS_MODE_ACPI); 262 } 263 264 Status = AcpiReadBitRegister (ACPI_BITREG_SCI_ENABLE, &Value); 265 if (ACPI_FAILURE (Status)) 266 { 267 return_UINT32 (ACPI_SYS_MODE_LEGACY); 268 } 269 270 if (Value) 271 { 272 return_UINT32 (ACPI_SYS_MODE_ACPI); 273 } 274 else 275 { 276 return_UINT32 (ACPI_SYS_MODE_LEGACY); 277 } 278} 279