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 - 2016, 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 #include "acpi.h" 117 #include "accommon.h" 118 119 120 #define _COMPONENT ACPI_HARDWARE 121 ACPI_MODULE_NAME ("hwacpi") 122 123 124 #if (!ACPI_REDUCED_HARDWARE) /* Entire module */ 125 /****************************************************************************** 126 * 127 * FUNCTION: AcpiHwSetMode 128 * 129 * PARAMETERS: Mode - SYS_MODE_ACPI or SYS_MODE_LEGACY 130 * 131 * RETURN: Status 132 * 133 * DESCRIPTION: Transitions the system into the requested mode. 134 * 135 ******************************************************************************/ 136 137 ACPI_STATUS 138 AcpiHwSetMode ( 139 UINT32 Mode) 140 { 141 142 ACPI_STATUS Status; 143 UINT32 Retry; 144 145 146 ACPI_FUNCTION_TRACE (HwSetMode); 147 148 149 /* If the Hardware Reduced flag is set, machine is always in acpi mode */ 150 151 if (AcpiGbl_ReducedHardware) 152 { 153 return_ACPI_STATUS (AE_OK); 154 } 155 156 /* 157 * ACPI 2.0 clarified that if SMI_CMD in FADT is zero, 158 * system does not support mode transition. 159 */ 160 if (!AcpiGbl_FADT.SmiCommand) 161 { 162 ACPI_ERROR ((AE_INFO, "No SMI_CMD in FADT, mode transition failed")); 163 return_ACPI_STATUS (AE_NO_HARDWARE_RESPONSE); 164 } 165 166 /* 167 * ACPI 2.0 clarified the meaning of ACPI_ENABLE and ACPI_DISABLE 168 * in FADT: If it is zero, enabling or disabling is not supported. 169 * As old systems may have used zero for mode transition, 170 * we make sure both the numbers are zero to determine these 171 * transitions are not supported. 172 */ 173 if (!AcpiGbl_FADT.AcpiEnable && !AcpiGbl_FADT.AcpiDisable) 174 { 175 ACPI_ERROR ((AE_INFO, 176 "No ACPI mode transition supported in this system " 177 "(enable/disable both zero)")); 178 return_ACPI_STATUS (AE_OK); 179 } 180 181 switch (Mode) 182 { 183 case ACPI_SYS_MODE_ACPI: 184 185 /* BIOS should have disabled ALL fixed and GP events */ 186 187 Status = AcpiHwWritePort (AcpiGbl_FADT.SmiCommand, 188 (UINT32) AcpiGbl_FADT.AcpiEnable, 8); 189 ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "Attempting to enable ACPI mode\n")); 190 break; 191 192 case ACPI_SYS_MODE_LEGACY: 193 /* 194 * BIOS should clear all fixed status bits and restore fixed event 195 * enable bits to default 196 */ 197 Status = AcpiHwWritePort (AcpiGbl_FADT.SmiCommand, 198 (UINT32) AcpiGbl_FADT.AcpiDisable, 8); 199 ACPI_DEBUG_PRINT ((ACPI_DB_INFO, 200 "Attempting to enable Legacy (non-ACPI) mode\n")); 201 break; 202 203 default: 204 205 return_ACPI_STATUS (AE_BAD_PARAMETER); 206 } 207 208 if (ACPI_FAILURE (Status)) 209 { 210 ACPI_EXCEPTION ((AE_INFO, Status, 211 "Could not write ACPI mode change")); 212 return_ACPI_STATUS (Status); 213 } 214 215 /* 216 * Some hardware takes a LONG time to switch modes. Give them 3 sec to 217 * do so, but allow faster systems to proceed more quickly. 218 */ 219 Retry = 3000; 220 while (Retry) 221 { 222 if (AcpiHwGetMode () == Mode) 223 { 224 ACPI_DEBUG_PRINT ((ACPI_DB_INFO, 225 "Mode %X successfully enabled\n", Mode)); 226 return_ACPI_STATUS (AE_OK); 227 } 228 AcpiOsStall (ACPI_USEC_PER_MSEC); 229 Retry--; 230 } 231 232 ACPI_ERROR ((AE_INFO, "Hardware did not change modes")); 233 return_ACPI_STATUS (AE_NO_HARDWARE_RESPONSE); 234 } 235 236 237 /******************************************************************************* 238 * 239 * FUNCTION: AcpiHwGetMode 240 * 241 * PARAMETERS: none 242 * 243 * RETURN: SYS_MODE_ACPI or SYS_MODE_LEGACY 244 * 245 * DESCRIPTION: Return current operating state of system. Determined by 246 * querying the SCI_EN bit. 247 * 248 ******************************************************************************/ 249 250 UINT32 251 AcpiHwGetMode ( 252 void) 253 { 254 ACPI_STATUS Status; 255 UINT32 Value; 256 257 258 ACPI_FUNCTION_TRACE (HwGetMode); 259 260 261 /* If the Hardware Reduced flag is set, machine is always in acpi mode */ 262 263 if (AcpiGbl_ReducedHardware) 264 { 265 return_UINT32 (ACPI_SYS_MODE_ACPI); 266 } 267 268 /* 269 * ACPI 2.0 clarified that if SMI_CMD in FADT is zero, 270 * system does not support mode transition. 271 */ 272 if (!AcpiGbl_FADT.SmiCommand) 273 { 274 return_UINT32 (ACPI_SYS_MODE_ACPI); 275 } 276 277 Status = AcpiReadBitRegister (ACPI_BITREG_SCI_ENABLE, &Value); 278 if (ACPI_FAILURE (Status)) 279 { 280 return_UINT32 (ACPI_SYS_MODE_LEGACY); 281 } 282 283 if (Value) 284 { 285 return_UINT32 (ACPI_SYS_MODE_ACPI); 286 } 287 else 288 { 289 return_UINT32 (ACPI_SYS_MODE_LEGACY); 290 } 291 } 292 293 #endif /* !ACPI_REDUCED_HARDWARE */ 294