hwsleep.c revision 245582
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 - 2013, 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 <contrib/dev/acpica/include/acpi.h> 46#include <contrib/dev/acpica/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 66ACPI_STATUS 67AcpiHwLegacySleep ( 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 UINT32 Retry; 76 ACPI_STATUS Status; 77 78 79 ACPI_FUNCTION_TRACE (HwLegacySleep); 80 81 82 SleepTypeRegInfo = AcpiHwGetBitRegisterInfo (ACPI_BITREG_SLEEP_TYPE); 83 SleepEnableRegInfo = AcpiHwGetBitRegisterInfo (ACPI_BITREG_SLEEP_ENABLE); 84 85 /* Clear wake status */ 86 87 Status = AcpiWriteBitRegister (ACPI_BITREG_WAKE_STATUS, 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 Retry = 1000; 196 do 197 { 198 Status = AcpiReadBitRegister (ACPI_BITREG_WAKE_STATUS, &InValue); 199 if (ACPI_FAILURE (Status)) 200 { 201 return_ACPI_STATUS (Status); 202 } 203 204 if (AcpiGbl_EnableInterpreterSlack) 205 { 206 /* 207 * Some BIOSs don't set WAK_STS at all. Give up waiting after 208 * 1000 retries if it still isn't set. 209 */ 210 if (Retry-- == 0) 211 { 212 break; 213 } 214 } 215 216 } while (!InValue); 217 218 return_ACPI_STATUS (AE_OK); 219} 220 221 222/******************************************************************************* 223 * 224 * FUNCTION: AcpiHwLegacyWakePrep 225 * 226 * PARAMETERS: SleepState - Which sleep state we just exited 227 * 228 * RETURN: Status 229 * 230 * DESCRIPTION: Perform the first state of OS-independent ACPI cleanup after a 231 * sleep. 232 * Called with interrupts ENABLED. 233 * 234 ******************************************************************************/ 235 236ACPI_STATUS 237AcpiHwLegacyWakePrep ( 238 UINT8 SleepState) 239{ 240 ACPI_STATUS Status; 241 ACPI_BIT_REGISTER_INFO *SleepTypeRegInfo; 242 ACPI_BIT_REGISTER_INFO *SleepEnableRegInfo; 243 UINT32 Pm1aControl; 244 UINT32 Pm1bControl; 245 246 247 ACPI_FUNCTION_TRACE (HwLegacyWakePrep); 248 249 /* 250 * Set SLP_TYPE and SLP_EN to state S0. 251 * This is unclear from the ACPI Spec, but it is required 252 * by some machines. 253 */ 254 Status = AcpiGetSleepTypeData (ACPI_STATE_S0, 255 &AcpiGbl_SleepTypeA, &AcpiGbl_SleepTypeB); 256 if (ACPI_SUCCESS (Status)) 257 { 258 SleepTypeRegInfo = 259 AcpiHwGetBitRegisterInfo (ACPI_BITREG_SLEEP_TYPE); 260 SleepEnableRegInfo = 261 AcpiHwGetBitRegisterInfo (ACPI_BITREG_SLEEP_ENABLE); 262 263 /* Get current value of PM1A control */ 264 265 Status = AcpiHwRegisterRead (ACPI_REGISTER_PM1_CONTROL, 266 &Pm1aControl); 267 if (ACPI_SUCCESS (Status)) 268 { 269 /* Clear the SLP_EN and SLP_TYP fields */ 270 271 Pm1aControl &= ~(SleepTypeRegInfo->AccessBitMask | 272 SleepEnableRegInfo->AccessBitMask); 273 Pm1bControl = Pm1aControl; 274 275 /* Insert the SLP_TYP bits */ 276 277 Pm1aControl |= (AcpiGbl_SleepTypeA << 278 SleepTypeRegInfo->BitPosition); 279 Pm1bControl |= (AcpiGbl_SleepTypeB << 280 SleepTypeRegInfo->BitPosition); 281 282 /* Write the control registers and ignore any errors */ 283 284 (void) AcpiHwWritePm1Control (Pm1aControl, Pm1bControl); 285 } 286 } 287 288 return_ACPI_STATUS (Status); 289} 290 291 292/******************************************************************************* 293 * 294 * FUNCTION: AcpiHwLegacyWake 295 * 296 * PARAMETERS: SleepState - Which sleep state we just exited 297 * 298 * RETURN: Status 299 * 300 * DESCRIPTION: Perform OS-independent ACPI cleanup after a sleep 301 * Called with interrupts ENABLED. 302 * 303 ******************************************************************************/ 304 305ACPI_STATUS 306AcpiHwLegacyWake ( 307 UINT8 SleepState) 308{ 309 ACPI_STATUS Status; 310 311 312 ACPI_FUNCTION_TRACE (HwLegacyWake); 313 314 315 /* Ensure EnterSleepStatePrep -> EnterSleepState ordering */ 316 317 AcpiGbl_SleepTypeA = ACPI_SLEEP_TYPE_INVALID; 318 AcpiHwExecuteSleepMethod (METHOD_PATHNAME__SST, ACPI_SST_WAKING); 319 320 /* 321 * GPEs must be enabled before _WAK is called as GPEs 322 * might get fired there 323 * 324 * Restore the GPEs: 325 * 1) Disable/Clear all GPEs 326 * 2) Enable all runtime GPEs 327 */ 328 Status = AcpiHwDisableAllGpes (); 329 if (ACPI_FAILURE (Status)) 330 { 331 return_ACPI_STATUS (Status); 332 } 333 334 Status = AcpiHwEnableAllRuntimeGpes (); 335 if (ACPI_FAILURE (Status)) 336 { 337 return_ACPI_STATUS (Status); 338 } 339 340 /* 341 * Now we can execute _WAK, etc. Some machines require that the GPEs 342 * are enabled before the wake methods are executed. 343 */ 344 AcpiHwExecuteSleepMethod (METHOD_PATHNAME__WAK, SleepState); 345 346 /* 347 * Some BIOS code assumes that WAK_STS will be cleared on resume 348 * and use it to determine whether the system is rebooting or 349 * resuming. Clear WAK_STS for compatibility. 350 */ 351 (void) AcpiWriteBitRegister (ACPI_BITREG_WAKE_STATUS, ACPI_CLEAR_STATUS); 352 AcpiGbl_SystemAwakeAndRunning = TRUE; 353 354 /* Enable power button */ 355 356 (void) AcpiWriteBitRegister( 357 AcpiGbl_FixedEventInfo[ACPI_EVENT_POWER_BUTTON].EnableRegisterId, 358 ACPI_ENABLE_EVENT); 359 360 (void) AcpiWriteBitRegister( 361 AcpiGbl_FixedEventInfo[ACPI_EVENT_POWER_BUTTON].StatusRegisterId, 362 ACPI_CLEAR_STATUS); 363 364 AcpiHwExecuteSleepMethod (METHOD_PATHNAME__SST, ACPI_SST_WORKING); 365 return_ACPI_STATUS (Status); 366} 367 368#endif /* !ACPI_REDUCED_HARDWARE */ 369