1 /****************************************************************************** 2 * 3 * Name: hwsleep.c - ACPI Hardware Sleep/Wake Support functions for the 4 * original/legacy sleep/PM 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 ("hwsleep") 50 51 52 #if (!ACPI_REDUCED_HARDWARE) /* Entire module */ 53 /******************************************************************************* 54 * 55 * FUNCTION: AcpiHwLegacySleep 56 * 57 * PARAMETERS: SleepState - Which sleep state to enter 58 * 59 * RETURN: Status 60 * 61 * DESCRIPTION: Enter a system sleep state via the legacy FADT PM registers 62 * THIS FUNCTION MUST BE CALLED WITH INTERRUPTS DISABLED 63 * 64 ******************************************************************************/ 65 66 ACPI_STATUS 67 AcpiHwLegacySleep ( 68 UINT8 SleepState) 69 { 70 ACPI_BIT_REGISTER_INFO *SleepTypeRegInfo; 71 ACPI_BIT_REGISTER_INFO *SleepEnableRegInfo; 72 UINT32 Pm1aControl; 73 UINT32 Pm1bControl; 74 UINT32 InValue; 75 ACPI_STATUS Status; 76 77 78 ACPI_FUNCTION_TRACE (HwLegacySleep); 79 80 81 SleepTypeRegInfo = AcpiHwGetBitRegisterInfo (ACPI_BITREG_SLEEP_TYPE); 82 SleepEnableRegInfo = AcpiHwGetBitRegisterInfo (ACPI_BITREG_SLEEP_ENABLE); 83 84 /* Clear wake status */ 85 86 Status = AcpiWriteBitRegister (ACPI_BITREG_WAKE_STATUS, 87 ACPI_CLEAR_STATUS); 88 if (ACPI_FAILURE (Status)) 89 { 90 return_ACPI_STATUS (Status); 91 } 92 93 /* Clear all fixed and general purpose status bits */ 94 95 Status = AcpiHwClearAcpiStatus (); 96 if (ACPI_FAILURE (Status)) 97 { 98 return_ACPI_STATUS (Status); 99 } 100 101 /* 102 * 1) Disable/Clear all GPEs 103 * 2) Enable all wakeup GPEs 104 */ 105 Status = AcpiHwDisableAllGpes (); 106 if (ACPI_FAILURE (Status)) 107 { 108 return_ACPI_STATUS (Status); 109 } 110 AcpiGbl_SystemAwakeAndRunning = FALSE; 111 112 Status = AcpiHwEnableAllWakeupGpes (); 113 if (ACPI_FAILURE (Status)) 114 { 115 return_ACPI_STATUS (Status); 116 } 117 118 /* Get current value of PM1A control */ 119 120 Status = AcpiHwRegisterRead (ACPI_REGISTER_PM1_CONTROL, 121 &Pm1aControl); 122 if (ACPI_FAILURE (Status)) 123 { 124 return_ACPI_STATUS (Status); 125 } 126 ACPI_DEBUG_PRINT ((ACPI_DB_INIT, 127 "Entering sleep state [S%u]\n", SleepState)); 128 129 /* Clear the SLP_EN and SLP_TYP fields */ 130 131 Pm1aControl &= ~(SleepTypeRegInfo->AccessBitMask | 132 SleepEnableRegInfo->AccessBitMask); 133 Pm1bControl = Pm1aControl; 134 135 /* Insert the SLP_TYP bits */ 136 137 Pm1aControl |= (AcpiGbl_SleepTypeA << SleepTypeRegInfo->BitPosition); 138 Pm1bControl |= (AcpiGbl_SleepTypeB << SleepTypeRegInfo->BitPosition); 139 140 /* 141 * We split the writes of SLP_TYP and SLP_EN to workaround 142 * poorly implemented hardware. 143 */ 144 145 /* Write #1: write the SLP_TYP data to the PM1 Control registers */ 146 147 Status = AcpiHwWritePm1Control (Pm1aControl, Pm1bControl); 148 if (ACPI_FAILURE (Status)) 149 { 150 return_ACPI_STATUS (Status); 151 } 152 153 /* Insert the sleep enable (SLP_EN) bit */ 154 155 Pm1aControl |= SleepEnableRegInfo->AccessBitMask; 156 Pm1bControl |= SleepEnableRegInfo->AccessBitMask; 157 158 /* Flush caches, as per ACPI specification */ 159 160 ACPI_FLUSH_CPU_CACHE (); 161 162 /* Write #2: Write both SLP_TYP + SLP_EN */ 163 164 Status = AcpiHwWritePm1Control (Pm1aControl, Pm1bControl); 165 if (ACPI_FAILURE (Status)) 166 { 167 return_ACPI_STATUS (Status); 168 } 169 170 if (SleepState > ACPI_STATE_S3) 171 { 172 /* 173 * We wanted to sleep > S3, but it didn't happen (by virtue of the 174 * fact that we are still executing!) 175 * 176 * Wait ten seconds, then try again. This is to get S4/S5 to work on 177 * all machines. 178 * 179 * We wait so long to allow chipsets that poll this reg very slowly 180 * to still read the right value. Ideally, this block would go 181 * away entirely. 182 */ 183 AcpiOsStall (10 * ACPI_USEC_PER_SEC); 184 185 Status = AcpiHwRegisterWrite (ACPI_REGISTER_PM1_CONTROL, 186 SleepEnableRegInfo->AccessBitMask); 187 if (ACPI_FAILURE (Status)) 188 { 189 return_ACPI_STATUS (Status); 190 } 191 } 192 193 /* Wait for transition back to Working State */ 194 195 do 196 { 197 Status = AcpiReadBitRegister (ACPI_BITREG_WAKE_STATUS, &InValue); 198 if (ACPI_FAILURE (Status)) 199 { 200 return_ACPI_STATUS (Status); 201 } 202 203 } while (!InValue); 204 205 return_ACPI_STATUS (AE_OK); 206 } 207 208 209 /******************************************************************************* 210 * 211 * FUNCTION: AcpiHwLegacyWakePrep 212 * 213 * PARAMETERS: SleepState - Which sleep state we just exited 214 * 215 * RETURN: Status 216 * 217 * DESCRIPTION: Perform the first state of OS-independent ACPI cleanup after a 218 * sleep. 219 * Called with interrupts ENABLED. 220 * 221 ******************************************************************************/ 222 223 ACPI_STATUS 224 AcpiHwLegacyWakePrep ( 225 UINT8 SleepState) 226 { 227 ACPI_STATUS Status; 228 ACPI_BIT_REGISTER_INFO *SleepTypeRegInfo; 229 ACPI_BIT_REGISTER_INFO *SleepEnableRegInfo; 230 UINT32 Pm1aControl; 231 UINT32 Pm1bControl; 232 233 234 ACPI_FUNCTION_TRACE (HwLegacyWakePrep); 235 236 /* 237 * Set SLP_TYPE and SLP_EN to state S0. 238 * This is unclear from the ACPI Spec, but it is required 239 * by some machines. 240 */ 241 Status = AcpiGetSleepTypeData (ACPI_STATE_S0, 242 &AcpiGbl_SleepTypeA, &AcpiGbl_SleepTypeB); 243 if (ACPI_SUCCESS (Status)) 244 { 245 SleepTypeRegInfo = 246 AcpiHwGetBitRegisterInfo (ACPI_BITREG_SLEEP_TYPE); 247 SleepEnableRegInfo = 248 AcpiHwGetBitRegisterInfo (ACPI_BITREG_SLEEP_ENABLE); 249 250 /* Get current value of PM1A control */ 251 252 Status = AcpiHwRegisterRead (ACPI_REGISTER_PM1_CONTROL, 253 &Pm1aControl); 254 if (ACPI_SUCCESS (Status)) 255 { 256 /* Clear the SLP_EN and SLP_TYP fields */ 257 258 Pm1aControl &= ~(SleepTypeRegInfo->AccessBitMask | 259 SleepEnableRegInfo->AccessBitMask); 260 Pm1bControl = Pm1aControl; 261 262 /* Insert the SLP_TYP bits */ 263 264 Pm1aControl |= (AcpiGbl_SleepTypeA << 265 SleepTypeRegInfo->BitPosition); 266 Pm1bControl |= (AcpiGbl_SleepTypeB << 267 SleepTypeRegInfo->BitPosition); 268 269 /* Write the control registers and ignore any errors */ 270 271 (void) AcpiHwWritePm1Control (Pm1aControl, Pm1bControl); 272 } 273 } 274 275 return_ACPI_STATUS (Status); 276 } 277 278 279 /******************************************************************************* 280 * 281 * FUNCTION: AcpiHwLegacyWake 282 * 283 * PARAMETERS: SleepState - Which sleep state we just exited 284 * 285 * RETURN: Status 286 * 287 * DESCRIPTION: Perform OS-independent ACPI cleanup after a sleep 288 * Called with interrupts ENABLED. 289 * 290 ******************************************************************************/ 291 292 ACPI_STATUS 293 AcpiHwLegacyWake ( 294 UINT8 SleepState) 295 { 296 ACPI_STATUS Status; 297 298 299 ACPI_FUNCTION_TRACE (HwLegacyWake); 300 301 302 /* Ensure EnterSleepStatePrep -> EnterSleepState ordering */ 303 304 AcpiGbl_SleepTypeA = ACPI_SLEEP_TYPE_INVALID; 305 AcpiHwExecuteSleepMethod (METHOD_PATHNAME__SST, ACPI_SST_WAKING); 306 307 /* 308 * GPEs must be enabled before _WAK is called as GPEs 309 * might get fired there 310 * 311 * Restore the GPEs: 312 * 1) Disable/Clear all GPEs 313 * 2) Enable all runtime GPEs 314 */ 315 Status = AcpiHwDisableAllGpes (); 316 if (ACPI_FAILURE (Status)) 317 { 318 return_ACPI_STATUS (Status); 319 } 320 321 Status = AcpiHwEnableAllRuntimeGpes (); 322 if (ACPI_FAILURE (Status)) 323 { 324 return_ACPI_STATUS (Status); 325 } 326 327 /* 328 * Now we can execute _WAK, etc. Some machines require that the GPEs 329 * are enabled before the wake methods are executed. 330 */ 331 AcpiHwExecuteSleepMethod (METHOD_PATHNAME__WAK, SleepState); 332 333 /* 334 * Some BIOS code assumes that WAK_STS will be cleared on resume 335 * and use it to determine whether the system is rebooting or 336 * resuming. Clear WAK_STS for compatibility. 337 */ 338 (void) AcpiWriteBitRegister (ACPI_BITREG_WAKE_STATUS, 339 ACPI_CLEAR_STATUS); 340 AcpiGbl_SystemAwakeAndRunning = TRUE; 341 342 /* Enable power button */ 343 344 (void) AcpiWriteBitRegister( 345 AcpiGbl_FixedEventInfo[ACPI_EVENT_POWER_BUTTON].EnableRegisterId, 346 ACPI_ENABLE_EVENT); 347 348 (void) AcpiWriteBitRegister( 349 AcpiGbl_FixedEventInfo[ACPI_EVENT_POWER_BUTTON].StatusRegisterId, 350 ACPI_CLEAR_STATUS); 351 352 AcpiHwExecuteSleepMethod (METHOD_PATHNAME__SST, ACPI_SST_WORKING); 353 return_ACPI_STATUS (Status); 354 } 355 356 #endif /* !ACPI_REDUCED_HARDWARE */ 357