1 /****************************************************************************** 2 * 3 * Module Name: hwacpi - ACPI Hardware Initialization/Mode Interface 4 * 5 *****************************************************************************/ 6 7 /****************************************************************************** 8 * 9 * 1. Copyright Notice 10 * 11 * Some or all of this work - Copyright (c) 1999 - 2012, Intel Corp. 12 * All rights reserved. 13 * 14 * 2. License 15 * 16 * 2.1. This is your license from Intel Corp. under its intellectual property 17 * rights. You may have additional license terms from the party that provided 18 * you this software, covering your right to use that party's intellectual 19 * property rights. 20 * 21 * 2.2. Intel grants, free of charge, to any person ("Licensee") obtaining a 22 * copy of the source code appearing in this file ("Covered Code") an 23 * irrevocable, perpetual, worldwide license under Intel's copyrights in the 24 * base code distributed originally by Intel ("Original Intel Code") to copy, 25 * make derivatives, distribute, use and display any portion of the Covered 26 * Code in any form, with the right to sublicense such rights; and 27 * 28 * 2.3. Intel grants Licensee a non-exclusive and non-transferable patent 29 * license (with the right to sublicense), under only those claims of Intel 30 * patents that are infringed by the Original Intel Code, to make, use, sell, 31 * offer to sell, and import the Covered Code and derivative works thereof 32 * solely to the minimum extent necessary to exercise the above copyright 33 * license, and in no event shall the patent license extend to any additions 34 * to or modifications of the Original Intel Code. No other license or right 35 * is granted directly or by implication, estoppel or otherwise; 36 * 37 * The above copyright and patent license is granted only if the following 38 * conditions are met: 39 * 40 * 3. Conditions 41 * 42 * 3.1. Redistribution of Source with Rights to Further Distribute Source. 43 * Redistribution of source code of any substantial portion of the Covered 44 * Code or modification with rights to further distribute source must include 45 * the above Copyright Notice, the above License, this list of Conditions, 46 * and the following Disclaimer and Export Compliance provision. In addition, 47 * Licensee must cause all Covered Code to which Licensee contributes to 48 * contain a file documenting the changes Licensee made to create that Covered 49 * Code and the date of any change. Licensee must include in that file the 50 * documentation of any changes made by any predecessor Licensee. Licensee 51 * must include a prominent statement that the modification is derived, 52 * directly or indirectly, from Original Intel Code. 53 * 54 * 3.2. Redistribution of Source with no Rights to Further Distribute Source. 55 * Redistribution of source code of any substantial portion of the Covered 56 * Code or modification without rights to further distribute source must 57 * include the following Disclaimer and Export Compliance provision in the 58 * documentation and/or other materials provided with distribution. In 59 * addition, Licensee may not authorize further sublicense of source of any 60 * portion of the Covered Code, and must include terms to the effect that the 61 * license from Licensee to its licensee is limited to the intellectual 62 * property embodied in the software Licensee provides to its licensee, and 63 * not to intellectual property embodied in modifications its licensee may 64 * make. 65 * 66 * 3.3. Redistribution of Executable. Redistribution in executable form of any 67 * substantial portion of the Covered Code or modification must reproduce the 68 * above Copyright Notice, and the following Disclaimer and Export Compliance 69 * provision in the documentation and/or other materials provided with the 70 * distribution. 71 * 72 * 3.4. Intel retains all right, title, and interest in and to the Original 73 * Intel Code. 74 * 75 * 3.5. Neither the name Intel nor any other trademark owned or controlled by 76 * Intel shall be used in advertising or otherwise to promote the sale, use or 77 * other dealings in products derived from or relating to the Covered Code 78 * without prior written authorization from Intel. 79 * 80 * 4. Disclaimer and Export Compliance 81 * 82 * 4.1. INTEL MAKES NO WARRANTY OF ANY KIND REGARDING ANY SOFTWARE PROVIDED 83 * HERE. ANY SOFTWARE ORIGINATING FROM INTEL OR DERIVED FROM INTEL SOFTWARE 84 * IS PROVIDED "AS IS," AND INTEL WILL NOT PROVIDE ANY SUPPORT, ASSISTANCE, 85 * INSTALLATION, TRAINING OR OTHER SERVICES. INTEL WILL NOT PROVIDE ANY 86 * UPDATES, ENHANCEMENTS OR EXTENSIONS. INTEL SPECIFICALLY DISCLAIMS ANY 87 * IMPLIED WARRANTIES OF MERCHANTABILITY, NONINFRINGEMENT AND FITNESS FOR A 88 * PARTICULAR PURPOSE. 89 * 90 * 4.2. IN NO EVENT SHALL INTEL HAVE ANY LIABILITY TO LICENSEE, ITS LICENSEES 91 * OR ANY OTHER THIRD PARTY, FOR ANY LOST PROFITS, LOST DATA, LOSS OF USE OR 92 * COSTS OF PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES, OR FOR ANY INDIRECT, 93 * SPECIAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THIS AGREEMENT, UNDER ANY 94 * CAUSE OF ACTION OR THEORY OF LIABILITY, AND IRRESPECTIVE OF WHETHER INTEL 95 * HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES. THESE LIMITATIONS 96 * SHALL APPLY NOTWITHSTANDING THE FAILURE OF THE ESSENTIAL PURPOSE OF ANY 97 * LIMITED REMEDY. 98 * 99 * 4.3. Licensee shall not export, either directly or indirectly, any of this 100 * software or system incorporating such software without first obtaining any 101 * required license or other approval from the U. S. Department of Commerce or 102 * any other agency or department of the United States Government. In the 103 * event Licensee exports any such software from the United States or 104 * re-exports any such software from a foreign destination, Licensee shall 105 * ensure that the distribution and export/re-export of the software is in 106 * compliance with all laws, regulations, orders, or other restrictions of the 107 * U.S. Export Administration Regulations. Licensee agrees that neither it nor 108 * any of its subsidiaries will export/re-export any technical data, process, 109 * software, or service, directly or indirectly, to any country for which the 110 * United States government or any agency thereof requires an export license, 111 * other governmental approval, or letter of assurance, without first obtaining 112 * such license, approval or letter. 113 * 114 *****************************************************************************/ 115 116 #define __HWACPI_C__ 117 118 #include "acpi.h" 119 #include "accommon.h" 120 121 122 #define _COMPONENT ACPI_HARDWARE 123 ACPI_MODULE_NAME ("hwacpi") 124 125 126 #if (!ACPI_REDUCED_HARDWARE) /* Entire module */ 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 " 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 ******************************************************************************/ 243 244 UINT32 245 AcpiHwGetMode ( 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 } 279 280 #endif /* !ACPI_REDUCED_HARDWARE */ 281