1 2 /****************************************************************************** 3 * 4 * Module Name: hwacpi - ACPI Hardware Initialization/Mode Interface 5 * $Revision: 1.79 $ 6 * 7 *****************************************************************************/ 8 9 /****************************************************************************** 10 * 11 * 1. Copyright Notice 12 * 13 * Some or all of this work - Copyright (c) 1999 - 2008, Intel Corp. 14 * All rights reserved. 15 * 16 * 2. License 17 * 18 * 2.1. This is your license from Intel Corp. under its intellectual property 19 * rights. You may have additional license terms from the party that provided 20 * you this software, covering your right to use that party's intellectual 21 * property rights. 22 * 23 * 2.2. Intel grants, free of charge, to any person ("Licensee") obtaining a 24 * copy of the source code appearing in this file ("Covered Code") an 25 * irrevocable, perpetual, worldwide license under Intel's copyrights in the 26 * base code distributed originally by Intel ("Original Intel Code") to copy, 27 * make derivatives, distribute, use and display any portion of the Covered 28 * Code in any form, with the right to sublicense such rights; and 29 * 30 * 2.3. Intel grants Licensee a non-exclusive and non-transferable patent 31 * license (with the right to sublicense), under only those claims of Intel 32 * patents that are infringed by the Original Intel Code, to make, use, sell, 33 * offer to sell, and import the Covered Code and derivative works thereof 34 * solely to the minimum extent necessary to exercise the above copyright 35 * license, and in no event shall the patent license extend to any additions 36 * to or modifications of the Original Intel Code. No other license or right 37 * is granted directly or by implication, estoppel or otherwise; 38 * 39 * The above copyright and patent license is granted only if the following 40 * conditions are met: 41 * 42 * 3. Conditions 43 * 44 * 3.1. Redistribution of Source with Rights to Further Distribute Source. 45 * Redistribution of source code of any substantial portion of the Covered 46 * Code or modification with rights to further distribute source must include 47 * the above Copyright Notice, the above License, this list of Conditions, 48 * and the following Disclaimer and Export Compliance provision. In addition, 49 * Licensee must cause all Covered Code to which Licensee contributes to 50 * contain a file documenting the changes Licensee made to create that Covered 51 * Code and the date of any change. Licensee must include in that file the 52 * documentation of any changes made by any predecessor Licensee. Licensee 53 * must include a prominent statement that the modification is derived, 54 * directly or indirectly, from Original Intel Code. 55 * 56 * 3.2. Redistribution of Source with no Rights to Further Distribute Source. 57 * Redistribution of source code of any substantial portion of the Covered 58 * Code or modification without rights to further distribute source must 59 * include the following Disclaimer and Export Compliance provision in the 60 * documentation and/or other materials provided with distribution. In 61 * addition, Licensee may not authorize further sublicense of source of any 62 * portion of the Covered Code, and must include terms to the effect that the 63 * license from Licensee to its licensee is limited to the intellectual 64 * property embodied in the software Licensee provides to its licensee, and 65 * not to intellectual property embodied in modifications its licensee may 66 * make. 67 * 68 * 3.3. Redistribution of Executable. Redistribution in executable form of any 69 * substantial portion of the Covered Code or modification must reproduce the 70 * above Copyright Notice, and the following Disclaimer and Export Compliance 71 * provision in the documentation and/or other materials provided with the 72 * distribution. 73 * 74 * 3.4. Intel retains all right, title, and interest in and to the Original 75 * Intel Code. 76 * 77 * 3.5. Neither the name Intel nor any other trademark owned or controlled by 78 * Intel shall be used in advertising or otherwise to promote the sale, use or 79 * other dealings in products derived from or relating to the Covered Code 80 * without prior written authorization from Intel. 81 * 82 * 4. Disclaimer and Export Compliance 83 * 84 * 4.1. INTEL MAKES NO WARRANTY OF ANY KIND REGARDING ANY SOFTWARE PROVIDED 85 * HERE. ANY SOFTWARE ORIGINATING FROM INTEL OR DERIVED FROM INTEL SOFTWARE 86 * IS PROVIDED "AS IS," AND INTEL WILL NOT PROVIDE ANY SUPPORT, ASSISTANCE, 87 * INSTALLATION, TRAINING OR OTHER SERVICES. INTEL WILL NOT PROVIDE ANY 88 * UPDATES, ENHANCEMENTS OR EXTENSIONS. INTEL SPECIFICALLY DISCLAIMS ANY 89 * IMPLIED WARRANTIES OF MERCHANTABILITY, NONINFRINGEMENT AND FITNESS FOR A 90 * PARTICULAR PURPOSE. 91 * 92 * 4.2. IN NO EVENT SHALL INTEL HAVE ANY LIABILITY TO LICENSEE, ITS LICENSEES 93 * OR ANY OTHER THIRD PARTY, FOR ANY LOST PROFITS, LOST DATA, LOSS OF USE OR 94 * COSTS OF PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES, OR FOR ANY INDIRECT, 95 * SPECIAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THIS AGREEMENT, UNDER ANY 96 * CAUSE OF ACTION OR THEORY OF LIABILITY, AND IRRESPECTIVE OF WHETHER INTEL 97 * HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES. THESE LIMITATIONS 98 * SHALL APPLY NOTWITHSTANDING THE FAILURE OF THE ESSENTIAL PURPOSE OF ANY 99 * LIMITED REMEDY. 100 * 101 * 4.3. Licensee shall not export, either directly or indirectly, any of this 102 * software or system incorporating such software without first obtaining any 103 * required license or other approval from the U. S. Department of Commerce or 104 * any other agency or department of the United States Government. In the 105 * event Licensee exports any such software from the United States or 106 * re-exports any such software from a foreign destination, Licensee shall 107 * ensure that the distribution and export/re-export of the software is in 108 * compliance with all laws, regulations, orders, or other restrictions of the 109 * U.S. Export Administration Regulations. Licensee agrees that neither it nor 110 * any of its subsidiaries will export/re-export any technical data, process, 111 * software, or service, directly or indirectly, to any country for which the 112 * United States government or any agency thereof requires an export license, 113 * other governmental approval, or letter of assurance, without first obtaining 114 * such license, approval or letter. 115 * 116 *****************************************************************************/ 117 118 #define __HWACPI_C__ 119 120 #include "acpi.h" 121 122 123 #define _COMPONENT ACPI_HARDWARE 124 ACPI_MODULE_NAME ("hwacpi") 125 126 127 /****************************************************************************** 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 ******************************************************************************/ 138 139 ACPI_STATUS 140 AcpiHwSetMode ( 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 (enable/disable both zero)")); 171 return_ACPI_STATUS (AE_OK); 172 } 173 174 switch (Mode) 175 { 176 case ACPI_SYS_MODE_ACPI: 177 178 /* BIOS should have disabled ALL fixed and GP events */ 179 180 Status = AcpiOsWritePort (AcpiGbl_FADT.SmiCommand, 181 (UINT32) AcpiGbl_FADT.AcpiEnable, 8); 182 ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "Attempting to enable ACPI mode\n")); 183 break; 184 185 case ACPI_SYS_MODE_LEGACY: 186 187 /* 188 * BIOS should clear all fixed status bits and restore fixed event 189 * enable bits to default 190 */ 191 Status = AcpiOsWritePort (AcpiGbl_FADT.SmiCommand, 192 (UINT32) AcpiGbl_FADT.AcpiDisable, 8); 193 ACPI_DEBUG_PRINT ((ACPI_DB_INFO, 194 "Attempting to enable Legacy (non-ACPI) mode\n")); 195 break; 196 197 default: 198 return_ACPI_STATUS (AE_BAD_PARAMETER); 199 } 200 201 if (ACPI_FAILURE (Status)) 202 { 203 ACPI_EXCEPTION ((AE_INFO, Status, 204 "Could not write ACPI mode change")); 205 return_ACPI_STATUS (Status); 206 } 207 208 /* 209 * Some hardware takes a LONG time to switch modes. Give them 3 sec to 210 * do so, but allow faster systems to proceed more quickly. 211 */ 212 Retry = 3000; 213 while (Retry) 214 { 215 if (AcpiHwGetMode() == Mode) 216 { 217 ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "Mode %X successfully enabled\n", 218 Mode)); 219 return_ACPI_STATUS (AE_OK); 220 } 221 AcpiOsStall(1000); 222 Retry--; 223 } 224 225 ACPI_ERROR ((AE_INFO, "Hardware did not change modes")); 226 return_ACPI_STATUS (AE_NO_HARDWARE_RESPONSE); 227 } 228 229 230 /******************************************************************************* 231 * 232 * FUNCTION: AcpiHwGetMode 233 * 234 * PARAMETERS: none 235 * 236 * RETURN: SYS_MODE_ACPI or SYS_MODE_LEGACY 237 * 238 * DESCRIPTION: Return current operating state of system. Determined by 239 * querying the SCI_EN bit. 240 * 241 ******************************************************************************/ 242 243 UINT32 244 AcpiHwGetMode ( 245 void) 246 { 247 ACPI_STATUS Status; 248 UINT32 Value; 249 250 251 ACPI_FUNCTION_TRACE (HwGetMode); 252 253 254 /* 255 * ACPI 2.0 clarified that if SMI_CMD in FADT is zero, 256 * system does not support mode transition. 257 */ 258 if (!AcpiGbl_FADT.SmiCommand) 259 { 260 return_UINT32 (ACPI_SYS_MODE_ACPI); 261 } 262 263 Status = AcpiGetRegister (ACPI_BITREG_SCI_ENABLE, &Value); 264 if (ACPI_FAILURE (Status)) 265 { 266 return_UINT32 (ACPI_SYS_MODE_LEGACY); 267 } 268 269 if (Value) 270 { 271 return_UINT32 (ACPI_SYS_MODE_ACPI); 272 } 273 else 274 { 275 return_UINT32 (ACPI_SYS_MODE_LEGACY); 276 } 277 } 278