hwsleep.c revision 233250
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 - 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#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 * Flags - ACPI_EXECUTE_GTS to run optional method 59 * 60 * RETURN: Status 61 * 62 * DESCRIPTION: Enter a system sleep state via the legacy FADT PM registers 63 * THIS FUNCTION MUST BE CALLED WITH INTERRUPTS DISABLED 64 * 65 ******************************************************************************/ 66 67ACPI_STATUS 68AcpiHwLegacySleep ( 69 UINT8 SleepState, 70 UINT8 Flags) 71{ 72 ACPI_BIT_REGISTER_INFO *SleepTypeRegInfo; 73 ACPI_BIT_REGISTER_INFO *SleepEnableRegInfo; 74 UINT32 Pm1aControl; 75 UINT32 Pm1bControl; 76 UINT32 InValue; 77 UINT32 Retry; 78 ACPI_STATUS Status; 79 80 81 ACPI_FUNCTION_TRACE (HwLegacySleep); 82 83 84 SleepTypeRegInfo = AcpiHwGetBitRegisterInfo (ACPI_BITREG_SLEEP_TYPE); 85 SleepEnableRegInfo = AcpiHwGetBitRegisterInfo (ACPI_BITREG_SLEEP_ENABLE); 86 87 /* Clear wake status */ 88 89 Status = AcpiWriteBitRegister (ACPI_BITREG_WAKE_STATUS, ACPI_CLEAR_STATUS); 90 if (ACPI_FAILURE (Status)) 91 { 92 return_ACPI_STATUS (Status); 93 } 94 95 /* Clear all fixed and general purpose status bits */ 96 97 Status = AcpiHwClearAcpiStatus (); 98 if (ACPI_FAILURE (Status)) 99 { 100 return_ACPI_STATUS (Status); 101 } 102 103 if (SleepState != ACPI_STATE_S5) 104 { 105 /* 106 * Disable BM arbitration. This feature is contained within an 107 * optional register (PM2 Control), so ignore a BAD_ADDRESS 108 * exception. 109 */ 110 Status = AcpiWriteBitRegister (ACPI_BITREG_ARB_DISABLE, 1); 111 if (ACPI_FAILURE (Status) && (Status != AE_BAD_ADDRESS)) 112 { 113 return_ACPI_STATUS (Status); 114 } 115 } 116 117 /* 118 * 1) Disable/Clear all GPEs 119 * 2) Enable all wakeup GPEs 120 */ 121 Status = AcpiHwDisableAllGpes (); 122 if (ACPI_FAILURE (Status)) 123 { 124 return_ACPI_STATUS (Status); 125 } 126 AcpiGbl_SystemAwakeAndRunning = FALSE; 127 128 Status = AcpiHwEnableAllWakeupGpes (); 129 if (ACPI_FAILURE (Status)) 130 { 131 return_ACPI_STATUS (Status); 132 } 133 134 /* Optionally execute _GTS (Going To Sleep) */ 135 136 if (Flags & ACPI_EXECUTE_GTS) 137 { 138 AcpiHwExecuteSleepMethod (METHOD_PATHNAME__GTS, SleepState); 139 } 140 141 /* Get current value of PM1A control */ 142 143 Status = AcpiHwRegisterRead (ACPI_REGISTER_PM1_CONTROL, 144 &Pm1aControl); 145 if (ACPI_FAILURE (Status)) 146 { 147 return_ACPI_STATUS (Status); 148 } 149 ACPI_DEBUG_PRINT ((ACPI_DB_INIT, 150 "Entering sleep state [S%u]\n", SleepState)); 151 152 /* Clear the SLP_EN and SLP_TYP fields */ 153 154 Pm1aControl &= ~(SleepTypeRegInfo->AccessBitMask | 155 SleepEnableRegInfo->AccessBitMask); 156 Pm1bControl = Pm1aControl; 157 158 /* Insert the SLP_TYP bits */ 159 160 Pm1aControl |= (AcpiGbl_SleepTypeA << SleepTypeRegInfo->BitPosition); 161 Pm1bControl |= (AcpiGbl_SleepTypeB << SleepTypeRegInfo->BitPosition); 162 163 /* 164 * We split the writes of SLP_TYP and SLP_EN to workaround 165 * poorly implemented hardware. 166 */ 167 168 /* Write #1: write the SLP_TYP data to the PM1 Control registers */ 169 170 Status = AcpiHwWritePm1Control (Pm1aControl, Pm1bControl); 171 if (ACPI_FAILURE (Status)) 172 { 173 return_ACPI_STATUS (Status); 174 } 175 176 /* Insert the sleep enable (SLP_EN) bit */ 177 178 Pm1aControl |= SleepEnableRegInfo->AccessBitMask; 179 Pm1bControl |= SleepEnableRegInfo->AccessBitMask; 180 181 /* Flush caches, as per ACPI specification */ 182 183 ACPI_FLUSH_CPU_CACHE (); 184 185 /* Write #2: Write both SLP_TYP + SLP_EN */ 186 187 Status = AcpiHwWritePm1Control (Pm1aControl, Pm1bControl); 188 if (ACPI_FAILURE (Status)) 189 { 190 return_ACPI_STATUS (Status); 191 } 192 193 if (SleepState > ACPI_STATE_S3) 194 { 195 /* 196 * We wanted to sleep > S3, but it didn't happen (by virtue of the 197 * fact that we are still executing!) 198 * 199 * Wait ten seconds, then try again. This is to get S4/S5 to work on 200 * all machines. 201 * 202 * We wait so long to allow chipsets that poll this reg very slowly 203 * to still read the right value. Ideally, this block would go 204 * away entirely. 205 */ 206 AcpiOsStall (10000000); 207 208 Status = AcpiHwRegisterWrite (ACPI_REGISTER_PM1_CONTROL, 209 SleepEnableRegInfo->AccessBitMask); 210 if (ACPI_FAILURE (Status)) 211 { 212 return_ACPI_STATUS (Status); 213 } 214 } 215 216 /* Wait for transition back to Working State */ 217 218 Retry = 1000; 219 do 220 { 221 Status = AcpiReadBitRegister (ACPI_BITREG_WAKE_STATUS, &InValue); 222 if (ACPI_FAILURE (Status)) 223 { 224 return_ACPI_STATUS (Status); 225 } 226 227 if (AcpiGbl_EnableInterpreterSlack) 228 { 229 /* 230 * Some BIOSs don't set WAK_STS at all. Give up waiting after 231 * 1000 retries if it still isn't set. 232 */ 233 if (Retry-- == 0) 234 { 235 break; 236 } 237 } 238 239 } while (!InValue); 240 241 return_ACPI_STATUS (AE_OK); 242} 243 244 245/******************************************************************************* 246 * 247 * FUNCTION: AcpiHwLegacyWakePrep 248 * 249 * PARAMETERS: SleepState - Which sleep state we just exited 250 * Flags - ACPI_EXECUTE_BFS to run optional method 251 * 252 * RETURN: Status 253 * 254 * DESCRIPTION: Perform the first state of OS-independent ACPI cleanup after a 255 * sleep. 256 * Called with interrupts ENABLED. 257 * 258 ******************************************************************************/ 259 260ACPI_STATUS 261AcpiHwLegacyWakePrep ( 262 UINT8 SleepState, 263 UINT8 Flags) 264{ 265 ACPI_STATUS Status; 266 ACPI_BIT_REGISTER_INFO *SleepTypeRegInfo; 267 ACPI_BIT_REGISTER_INFO *SleepEnableRegInfo; 268 UINT32 Pm1aControl; 269 UINT32 Pm1bControl; 270 271 272 ACPI_FUNCTION_TRACE (HwLegacyWakePrep); 273 274 /* 275 * Set SLP_TYPE and SLP_EN to state S0. 276 * This is unclear from the ACPI Spec, but it is required 277 * by some machines. 278 */ 279 Status = AcpiGetSleepTypeData (ACPI_STATE_S0, 280 &AcpiGbl_SleepTypeA, &AcpiGbl_SleepTypeB); 281 if (ACPI_SUCCESS (Status)) 282 { 283 SleepTypeRegInfo = 284 AcpiHwGetBitRegisterInfo (ACPI_BITREG_SLEEP_TYPE); 285 SleepEnableRegInfo = 286 AcpiHwGetBitRegisterInfo (ACPI_BITREG_SLEEP_ENABLE); 287 288 /* Get current value of PM1A control */ 289 290 Status = AcpiHwRegisterRead (ACPI_REGISTER_PM1_CONTROL, 291 &Pm1aControl); 292 if (ACPI_SUCCESS (Status)) 293 { 294 /* Clear the SLP_EN and SLP_TYP fields */ 295 296 Pm1aControl &= ~(SleepTypeRegInfo->AccessBitMask | 297 SleepEnableRegInfo->AccessBitMask); 298 Pm1bControl = Pm1aControl; 299 300 /* Insert the SLP_TYP bits */ 301 302 Pm1aControl |= (AcpiGbl_SleepTypeA << 303 SleepTypeRegInfo->BitPosition); 304 Pm1bControl |= (AcpiGbl_SleepTypeB << 305 SleepTypeRegInfo->BitPosition); 306 307 /* Write the control registers and ignore any errors */ 308 309 (void) AcpiHwWritePm1Control (Pm1aControl, Pm1bControl); 310 } 311 } 312 313 /* Optionally execute _BFS (Back From Sleep) */ 314 315 if (Flags & ACPI_EXECUTE_BFS) 316 { 317 AcpiHwExecuteSleepMethod (METHOD_PATHNAME__BFS, SleepState); 318 } 319 return_ACPI_STATUS (Status); 320} 321 322 323/******************************************************************************* 324 * 325 * FUNCTION: AcpiHwLegacyWake 326 * 327 * PARAMETERS: SleepState - Which sleep state we just exited 328 * Flags - Reserved, set to zero 329 * 330 * RETURN: Status 331 * 332 * DESCRIPTION: Perform OS-independent ACPI cleanup after a sleep 333 * Called with interrupts ENABLED. 334 * 335 ******************************************************************************/ 336 337ACPI_STATUS 338AcpiHwLegacyWake ( 339 UINT8 SleepState, 340 UINT8 Flags) 341{ 342 ACPI_STATUS Status; 343 344 345 ACPI_FUNCTION_TRACE (HwLegacyWake); 346 347 348 /* Ensure EnterSleepStatePrep -> EnterSleepState ordering */ 349 350 AcpiGbl_SleepTypeA = ACPI_SLEEP_TYPE_INVALID; 351 AcpiHwExecuteSleepMethod (METHOD_PATHNAME__SST, ACPI_SST_WAKING); 352 353 /* 354 * GPEs must be enabled before _WAK is called as GPEs 355 * might get fired there 356 * 357 * Restore the GPEs: 358 * 1) Disable/Clear all GPEs 359 * 2) Enable all runtime GPEs 360 */ 361 Status = AcpiHwDisableAllGpes (); 362 if (ACPI_FAILURE (Status)) 363 { 364 return_ACPI_STATUS (Status); 365 } 366 367 Status = AcpiHwEnableAllRuntimeGpes (); 368 if (ACPI_FAILURE (Status)) 369 { 370 return_ACPI_STATUS (Status); 371 } 372 373 /* 374 * Now we can execute _WAK, etc. Some machines require that the GPEs 375 * are enabled before the wake methods are executed. 376 */ 377 AcpiHwExecuteSleepMethod (METHOD_PATHNAME__WAK, SleepState); 378 379 /* 380 * Some BIOS code assumes that WAK_STS will be cleared on resume 381 * and use it to determine whether the system is rebooting or 382 * resuming. Clear WAK_STS for compatibility. 383 */ 384 (void) AcpiWriteBitRegister (ACPI_BITREG_WAKE_STATUS, ACPI_CLEAR_STATUS); 385 AcpiGbl_SystemAwakeAndRunning = TRUE; 386 387 /* Enable power button */ 388 389 (void) AcpiWriteBitRegister( 390 AcpiGbl_FixedEventInfo[ACPI_EVENT_POWER_BUTTON].EnableRegisterId, 391 ACPI_ENABLE_EVENT); 392 393 (void) AcpiWriteBitRegister( 394 AcpiGbl_FixedEventInfo[ACPI_EVENT_POWER_BUTTON].StatusRegisterId, 395 ACPI_CLEAR_STATUS); 396 397 /* 398 * Enable BM arbitration. This feature is contained within an 399 * optional register (PM2 Control), so ignore a BAD_ADDRESS 400 * exception. 401 */ 402 Status = AcpiWriteBitRegister (ACPI_BITREG_ARB_DISABLE, 0); 403 if (ACPI_FAILURE (Status) && (Status != AE_BAD_ADDRESS)) 404 { 405 return_ACPI_STATUS (Status); 406 } 407 408 AcpiHwExecuteSleepMethod (METHOD_PATHNAME__SST, ACPI_SST_WORKING); 409 return_ACPI_STATUS (Status); 410} 411 412#endif /* !ACPI_REDUCED_HARDWARE */ 413