1 2 /****************************************************************************** 3 * 4 * Module Name: hwacpi - ACPI Hardware Initialization/Mode Interface 5 * 6 *****************************************************************************/ 7 8 /* 9 * Copyright (C) 2000 - 2012, Intel Corp. 10 * All rights reserved. 11 * 12 * Redistribution and use in source and binary forms, with or without 13 * modification, are permitted provided that the following conditions 14 * are met: 15 * 1. Redistributions of source code must retain the above copyright 16 * notice, this list of conditions, and the following disclaimer, 17 * without modification. 18 * 2. Redistributions in binary form must reproduce at minimum a disclaimer 19 * substantially similar to the "NO WARRANTY" disclaimer below 20 * ("Disclaimer") and any redistribution must be conditioned upon 21 * including a substantially similar Disclaimer requirement for further 22 * binary redistribution. 23 * 3. Neither the names of the above-listed copyright holders nor the names 24 * of any contributors may be used to endorse or promote products derived 25 * from this software without specific prior written permission. 26 * 27 * Alternatively, this software may be distributed under the terms of the 28 * GNU General Public License ("GPL") version 2 as published by the Free 29 * Software Foundation. 30 * 31 * NO WARRANTY 32 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 33 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 34 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR 35 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 36 * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 37 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 38 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 39 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 40 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING 41 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 42 * POSSIBILITY OF SUCH DAMAGES. 43 */ 44 45 #define __HWACPI_C__ 46 47 #include <contrib/dev/acpica/include/acpi.h> 48 #include <contrib/dev/acpica/include/accommon.h> 49 50 51 #define _COMPONENT ACPI_HARDWARE 52 ACPI_MODULE_NAME ("hwacpi") 53 54 55 #if (!ACPI_REDUCED_HARDWARE) /* Entire module */ 56 /****************************************************************************** 57 * 58 * FUNCTION: AcpiHwSetMode 59 * 60 * PARAMETERS: Mode - SYS_MODE_ACPI or SYS_MODE_LEGACY 61 * 62 * RETURN: Status 63 * 64 * DESCRIPTION: Transitions the system into the requested mode. 65 * 66 ******************************************************************************/ 67 68 ACPI_STATUS 69 AcpiHwSetMode ( 70 UINT32 Mode) 71 { 72 73 ACPI_STATUS Status; 74 UINT32 Retry; 75 76 77 ACPI_FUNCTION_TRACE (HwSetMode); 78 79 /* 80 * ACPI 2.0 clarified that if SMI_CMD in FADT is zero, 81 * system does not support mode transition. 82 */ 83 if (!AcpiGbl_FADT.SmiCommand) 84 { 85 ACPI_ERROR ((AE_INFO, "No SMI_CMD in FADT, mode transition failed")); 86 return_ACPI_STATUS (AE_NO_HARDWARE_RESPONSE); 87 } 88 89 /* 90 * ACPI 2.0 clarified the meaning of ACPI_ENABLE and ACPI_DISABLE 91 * in FADT: If it is zero, enabling or disabling is not supported. 92 * As old systems may have used zero for mode transition, 93 * we make sure both the numbers are zero to determine these 94 * transitions are not supported. 95 */ 96 if (!AcpiGbl_FADT.AcpiEnable && !AcpiGbl_FADT.AcpiDisable) 97 { 98 ACPI_ERROR ((AE_INFO, 99 "No ACPI mode transition supported in this system " 100 "(enable/disable both zero)")); 101 return_ACPI_STATUS (AE_OK); 102 } 103 104 switch (Mode) 105 { 106 case ACPI_SYS_MODE_ACPI: 107 108 /* BIOS should have disabled ALL fixed and GP events */ 109 110 Status = AcpiHwWritePort (AcpiGbl_FADT.SmiCommand, 111 (UINT32) AcpiGbl_FADT.AcpiEnable, 8); 112 ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "Attempting to enable ACPI mode\n")); 113 break; 114 115 case ACPI_SYS_MODE_LEGACY: 116 117 /* 118 * BIOS should clear all fixed status bits and restore fixed event 119 * enable bits to default 120 */ 121 Status = AcpiHwWritePort (AcpiGbl_FADT.SmiCommand, 122 (UINT32) AcpiGbl_FADT.AcpiDisable, 8); 123 ACPI_DEBUG_PRINT ((ACPI_DB_INFO, 124 "Attempting to enable Legacy (non-ACPI) mode\n")); 125 break; 126 127 default: 128 return_ACPI_STATUS (AE_BAD_PARAMETER); 129 } 130 131 if (ACPI_FAILURE (Status)) 132 { 133 ACPI_EXCEPTION ((AE_INFO, Status, 134 "Could not write ACPI mode change")); 135 return_ACPI_STATUS (Status); 136 } 137 138 /* 139 * Some hardware takes a LONG time to switch modes. Give them 3 sec to 140 * do so, but allow faster systems to proceed more quickly. 141 */ 142 Retry = 3000; 143 while (Retry) 144 { 145 if (AcpiHwGetMode() == Mode) 146 { 147 ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "Mode %X successfully enabled\n", 148 Mode)); 149 return_ACPI_STATUS (AE_OK); 150 } 151 AcpiOsStall(1000); 152 Retry--; 153 } 154 155 ACPI_ERROR ((AE_INFO, "Hardware did not change modes")); 156 return_ACPI_STATUS (AE_NO_HARDWARE_RESPONSE); 157 } 158 159 160 /******************************************************************************* 161 * 162 * FUNCTION: AcpiHwGetMode 163 * 164 * PARAMETERS: none 165 * 166 * RETURN: SYS_MODE_ACPI or SYS_MODE_LEGACY 167 * 168 * DESCRIPTION: Return current operating state of system. Determined by 169 * querying the SCI_EN bit. 170 * 171 ******************************************************************************/ 172 173 UINT32 174 AcpiHwGetMode ( 175 void) 176 { 177 ACPI_STATUS Status; 178 UINT32 Value; 179 180 181 ACPI_FUNCTION_TRACE (HwGetMode); 182 183 184 /* 185 * ACPI 2.0 clarified that if SMI_CMD in FADT is zero, 186 * system does not support mode transition. 187 */ 188 if (!AcpiGbl_FADT.SmiCommand) 189 { 190 return_UINT32 (ACPI_SYS_MODE_ACPI); 191 } 192 193 Status = AcpiReadBitRegister (ACPI_BITREG_SCI_ENABLE, &Value); 194 if (ACPI_FAILURE (Status)) 195 { 196 return_UINT32 (ACPI_SYS_MODE_LEGACY); 197 } 198 199 if (Value) 200 { 201 return_UINT32 (ACPI_SYS_MODE_ACPI); 202 } 203 else 204 { 205 return_UINT32 (ACPI_SYS_MODE_LEGACY); 206 } 207 } 208 209 #endif /* !ACPI_REDUCED_HARDWARE */ 210