1 /****************************************************************************** 2 * 3 * Name: hwesleep.c - ACPI Hardware Sleep/Wake Support functions for the 4 * extended FADT-V5 sleep registers. 5 * 6 *****************************************************************************/ 7 8 /* 9 * Copyright (C) 2000 - 2016, 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 #include "acpi.h" 46 #include "accommon.h" 47 48 #define _COMPONENT ACPI_HARDWARE 49 ACPI_MODULE_NAME ("hwesleep") 50 51 52 /******************************************************************************* 53 * 54 * FUNCTION: AcpiHwExecuteSleepMethod 55 * 56 * PARAMETERS: MethodPathname - Pathname of method to execute 57 * IntegerArgument - Argument to pass to the method 58 * 59 * RETURN: None 60 * 61 * DESCRIPTION: Execute a sleep/wake related method with one integer argument 62 * and no return value. 63 * 64 ******************************************************************************/ 65 66 void 67 AcpiHwExecuteSleepMethod ( 68 char *MethodPathname, 69 UINT32 IntegerArgument) 70 { 71 ACPI_OBJECT_LIST ArgList; 72 ACPI_OBJECT Arg; 73 ACPI_STATUS Status; 74 75 76 ACPI_FUNCTION_TRACE (HwExecuteSleepMethod); 77 78 79 /* One argument, IntegerArgument; No return value expected */ 80 81 ArgList.Count = 1; 82 ArgList.Pointer = &Arg; 83 Arg.Type = ACPI_TYPE_INTEGER; 84 Arg.Integer.Value = (UINT64) IntegerArgument; 85 86 Status = AcpiEvaluateObject (NULL, MethodPathname, &ArgList, NULL); 87 if (ACPI_FAILURE (Status) && Status != AE_NOT_FOUND) 88 { 89 ACPI_EXCEPTION ((AE_INFO, Status, "While executing method %s", 90 MethodPathname)); 91 } 92 93 return_VOID; 94 } 95 96 97 /******************************************************************************* 98 * 99 * FUNCTION: AcpiHwExtendedSleep 100 * 101 * PARAMETERS: SleepState - Which sleep state to enter 102 * 103 * RETURN: Status 104 * 105 * DESCRIPTION: Enter a system sleep state via the extended FADT sleep 106 * registers (V5 FADT). 107 * THIS FUNCTION MUST BE CALLED WITH INTERRUPTS DISABLED 108 * 109 ******************************************************************************/ 110 111 ACPI_STATUS 112 AcpiHwExtendedSleep ( 113 UINT8 SleepState) 114 { 115 ACPI_STATUS Status; 116 UINT8 SleepTypeValue; 117 UINT64 SleepStatus; 118 119 120 ACPI_FUNCTION_TRACE (HwExtendedSleep); 121 122 123 /* Extended sleep registers must be valid */ 124 125 if (!AcpiGbl_FADT.SleepControl.Address || 126 !AcpiGbl_FADT.SleepStatus.Address) 127 { 128 return_ACPI_STATUS (AE_NOT_EXIST); 129 } 130 131 /* Clear wake status (WAK_STS) */ 132 133 Status = AcpiWrite ((UINT64) ACPI_X_WAKE_STATUS, 134 &AcpiGbl_FADT.SleepStatus); 135 if (ACPI_FAILURE (Status)) 136 { 137 return_ACPI_STATUS (Status); 138 } 139 140 AcpiGbl_SystemAwakeAndRunning = FALSE; 141 142 /* Flush caches, as per ACPI specification */ 143 144 ACPI_FLUSH_CPU_CACHE (); 145 146 /* 147 * Set the SLP_TYP and SLP_EN bits. 148 * 149 * Note: We only use the first value returned by the \_Sx method 150 * (AcpiGbl_SleepTypeA) - As per ACPI specification. 151 */ 152 ACPI_DEBUG_PRINT ((ACPI_DB_INIT, 153 "Entering sleep state [S%u]\n", SleepState)); 154 155 SleepTypeValue = ((AcpiGbl_SleepTypeA << ACPI_X_SLEEP_TYPE_POSITION) & 156 ACPI_X_SLEEP_TYPE_MASK); 157 158 Status = AcpiWrite ((UINT64) (SleepTypeValue | ACPI_X_SLEEP_ENABLE), 159 &AcpiGbl_FADT.SleepControl); 160 if (ACPI_FAILURE (Status)) 161 { 162 return_ACPI_STATUS (Status); 163 } 164 165 /* Wait for transition back to Working State */ 166 167 do 168 { 169 Status = AcpiRead (&SleepStatus, &AcpiGbl_FADT.SleepStatus); 170 if (ACPI_FAILURE (Status)) 171 { 172 return_ACPI_STATUS (Status); 173 } 174 175 } while (!(((UINT8) SleepStatus) & ACPI_X_WAKE_STATUS)); 176 177 return_ACPI_STATUS (AE_OK); 178 } 179 180 181 /******************************************************************************* 182 * 183 * FUNCTION: AcpiHwExtendedWakePrep 184 * 185 * PARAMETERS: SleepState - Which sleep state we just exited 186 * 187 * RETURN: Status 188 * 189 * DESCRIPTION: Perform first part of OS-independent ACPI cleanup after 190 * a sleep. Called with interrupts ENABLED. 191 * 192 ******************************************************************************/ 193 194 ACPI_STATUS 195 AcpiHwExtendedWakePrep ( 196 UINT8 SleepState) 197 { 198 ACPI_STATUS Status; 199 UINT8 SleepTypeValue; 200 201 202 ACPI_FUNCTION_TRACE (HwExtendedWakePrep); 203 204 205 Status = AcpiGetSleepTypeData (ACPI_STATE_S0, 206 &AcpiGbl_SleepTypeA, &AcpiGbl_SleepTypeB); 207 if (ACPI_SUCCESS (Status)) 208 { 209 SleepTypeValue = ((AcpiGbl_SleepTypeA << ACPI_X_SLEEP_TYPE_POSITION) & 210 ACPI_X_SLEEP_TYPE_MASK); 211 212 (void) AcpiWrite ((UINT64) (SleepTypeValue | ACPI_X_SLEEP_ENABLE), 213 &AcpiGbl_FADT.SleepControl); 214 } 215 216 return_ACPI_STATUS (AE_OK); 217 } 218 219 220 /******************************************************************************* 221 * 222 * FUNCTION: AcpiHwExtendedWake 223 * 224 * PARAMETERS: SleepState - Which sleep state we just exited 225 * 226 * RETURN: Status 227 * 228 * DESCRIPTION: Perform OS-independent ACPI cleanup after a sleep 229 * Called with interrupts ENABLED. 230 * 231 ******************************************************************************/ 232 233 ACPI_STATUS 234 AcpiHwExtendedWake ( 235 UINT8 SleepState) 236 { 237 ACPI_FUNCTION_TRACE (HwExtendedWake); 238 239 240 /* Ensure EnterSleepStatePrep -> EnterSleepState ordering */ 241 242 AcpiGbl_SleepTypeA = ACPI_SLEEP_TYPE_INVALID; 243 244 /* Execute the wake methods */ 245 246 AcpiHwExecuteSleepMethod (METHOD_PATHNAME__SST, ACPI_SST_WAKING); 247 AcpiHwExecuteSleepMethod (METHOD_PATHNAME__WAK, SleepState); 248 249 /* 250 * Some BIOS code assumes that WAK_STS will be cleared on resume 251 * and use it to determine whether the system is rebooting or 252 * resuming. Clear WAK_STS for compatibility. 253 */ 254 (void) AcpiWrite ((UINT64) ACPI_X_WAKE_STATUS, &AcpiGbl_FADT.SleepStatus); 255 AcpiGbl_SystemAwakeAndRunning = TRUE; 256 257 AcpiHwExecuteSleepMethod (METHOD_PATHNAME__SST, ACPI_SST_WORKING); 258 return_ACPI_STATUS (AE_OK); 259 } 260