hwacpi.c revision 67754
1/****************************************************************************** 2 * 3 * Module Name: hwacpi - ACPI hardware functions - mode and timer 4 * $Revision: 24 $ 5 * 6 *****************************************************************************/ 7 8/****************************************************************************** 9 * 10 * 1. Copyright Notice 11 * 12 * Some or all of this work - Copyright (c) 1999, Intel Corp. All rights 13 * reserved. 14 * 15 * 2. License 16 * 17 * 2.1. This is your license from Intel Corp. under its intellectual property 18 * rights. You may have additional license terms from the party that provided 19 * you this software, covering your right to use that party's intellectual 20 * property rights. 21 * 22 * 2.2. Intel grants, free of charge, to any person ("Licensee") obtaining a 23 * copy of the source code appearing in this file ("Covered Code") an 24 * irrevocable, perpetual, worldwide license under Intel's copyrights in the 25 * base code distributed originally by Intel ("Original Intel Code") to copy, 26 * make derivatives, distribute, use and display any portion of the Covered 27 * Code in any form, with the right to sublicense such rights; and 28 * 29 * 2.3. Intel grants Licensee a non-exclusive and non-transferable patent 30 * license (with the right to sublicense), under only those claims of Intel 31 * patents that are infringed by the Original Intel Code, to make, use, sell, 32 * offer to sell, and import the Covered Code and derivative works thereof 33 * solely to the minimum extent necessary to exercise the above copyright 34 * license, and in no event shall the patent license extend to any additions 35 * to or modifications of the Original Intel Code. No other license or right 36 * is granted directly or by implication, estoppel or otherwise; 37 * 38 * The above copyright and patent license is granted only if the following 39 * conditions are met: 40 * 41 * 3. Conditions 42 * 43 * 3.1. Redistribution of Source with Rights to Further Distribute Source. 44 * Redistribution of source code of any substantial portion of the Covered 45 * Code or modification with rights to further distribute source must include 46 * the above Copyright Notice, the above License, this list of Conditions, 47 * and the following Disclaimer and Export Compliance provision. In addition, 48 * Licensee must cause all Covered Code to which Licensee contributes to 49 * contain a file documenting the changes Licensee made to create that Covered 50 * Code and the date of any change. Licensee must include in that file the 51 * documentation of any changes made by any predecessor Licensee. Licensee 52 * must include a prominent statement that the modification is derived, 53 * directly or indirectly, from Original Intel Code. 54 * 55 * 3.2. Redistribution of Source with no Rights to Further Distribute Source. 56 * Redistribution of source code of any substantial portion of the Covered 57 * Code or modification without rights to further distribute source must 58 * include the following Disclaimer and Export Compliance provision in the 59 * documentation and/or other materials provided with distribution. In 60 * addition, Licensee may not authorize further sublicense of source of any 61 * portion of the Covered Code, and must include terms to the effect that the 62 * license from Licensee to its licensee is limited to the intellectual 63 * property embodied in the software Licensee provides to its licensee, and 64 * not to intellectual property embodied in modifications its licensee may 65 * make. 66 * 67 * 3.3. Redistribution of Executable. Redistribution in executable form of any 68 * substantial portion of the Covered Code or modification must reproduce the 69 * above Copyright Notice, and the following Disclaimer and Export Compliance 70 * provision in the documentation and/or other materials provided with the 71 * distribution. 72 * 73 * 3.4. Intel retains all right, title, and interest in and to the Original 74 * Intel Code. 75 * 76 * 3.5. Neither the name Intel nor any other trademark owned or controlled by 77 * Intel shall be used in advertising or otherwise to promote the sale, use or 78 * other dealings in products derived from or relating to the Covered Code 79 * without prior written authorization from Intel. 80 * 81 * 4. Disclaimer and Export Compliance 82 * 83 * 4.1. INTEL MAKES NO WARRANTY OF ANY KIND REGARDING ANY SOFTWARE PROVIDED 84 * HERE. ANY SOFTWARE ORIGINATING FROM INTEL OR DERIVED FROM INTEL SOFTWARE 85 * IS PROVIDED "AS IS," AND INTEL WILL NOT PROVIDE ANY SUPPORT, ASSISTANCE, 86 * INSTALLATION, TRAINING OR OTHER SERVICES. INTEL WILL NOT PROVIDE ANY 87 * UPDATES, ENHANCEMENTS OR EXTENSIONS. INTEL SPECIFICALLY DISCLAIMS ANY 88 * IMPLIED WARRANTIES OF MERCHANTABILITY, NONINFRINGEMENT AND FITNESS FOR A 89 * PARTICULAR PURPOSE. 90 * 91 * 4.2. IN NO EVENT SHALL INTEL HAVE ANY LIABILITY TO LICENSEE, ITS LICENSEES 92 * OR ANY OTHER THIRD PARTY, FOR ANY LOST PROFITS, LOST DATA, LOSS OF USE OR 93 * COSTS OF PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES, OR FOR ANY INDIRECT, 94 * SPECIAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THIS AGREEMENT, UNDER ANY 95 * CAUSE OF ACTION OR THEORY OF LIABILITY, AND IRRESPECTIVE OF WHETHER INTEL 96 * HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES. THESE LIMITATIONS 97 * SHALL APPLY NOTWITHSTANDING THE FAILURE OF THE ESSENTIAL PURPOSE OF ANY 98 * LIMITED REMEDY. 99 * 100 * 4.3. Licensee shall not export, either directly or indirectly, any of this 101 * software or system incorporating such software without first obtaining any 102 * required license or other approval from the U. S. Department of Commerce or 103 * any other agency or department of the United States Government. In the 104 * event Licensee exports any such software from the United States or 105 * re-exports any such software from a foreign destination, Licensee shall 106 * ensure that the distribution and export/re-export of the software is in 107 * compliance with all laws, regulations, orders, or other restrictions of the 108 * U.S. Export Administration Regulations. Licensee agrees that neither it nor 109 * any of its subsidiaries will export/re-export any technical data, process, 110 * software, or service, directly or indirectly, to any country for which the 111 * United States government or any agency thereof requires an export license, 112 * other governmental approval, or letter of assurance, without first obtaining 113 * such license, approval or letter. 114 * 115 *****************************************************************************/ 116 117#define __HWACPI_C__ 118 119#include "acpi.h" 120#include "achware.h" 121 122 123#define _COMPONENT HARDWARE 124 MODULE_NAME ("hwacpi") 125 126 127/****************************************************************************** 128 * 129 * FUNCTION: AcpiHwInitialize 130 * 131 * PARAMETERS: None 132 * 133 * RETURN: Status 134 * 135 * DESCRIPTION: Initialize and validate various ACPI registers 136 * 137 ******************************************************************************/ 138 139ACPI_STATUS 140AcpiHwInitialize ( 141 void) 142{ 143 ACPI_STATUS Status = AE_OK; 144 UINT32 Index; 145 146 147 FUNCTION_TRACE ("HwInitialize"); 148 149 150 /* We must have the ACPI tables by the time we get here */ 151 152 if (!AcpiGbl_FACP) 153 { 154 AcpiGbl_RestoreAcpiChipset = FALSE; 155 156 DEBUG_PRINT (ACPI_ERROR, ("HwInitialize: No FACP!\n")); 157 158 return_ACPI_STATUS (AE_NO_ACPI_TABLES); 159 } 160 161 /* Must support *some* mode! */ 162/* 163 if (!(SystemFlags & SYS_MODES_MASK)) 164 { 165 RestoreAcpiChipset = FALSE; 166 167 DEBUG_PRINT (ACPI_ERROR, 168 ("CmHardwareInitialize: Supported modes uninitialized!\n")); 169 return_ACPI_STATUS (AE_ERROR); 170 } 171 172*/ 173 174 175 switch (AcpiGbl_SystemFlags & SYS_MODES_MASK) 176 { 177 /* Identify current ACPI/legacy mode */ 178 179 case (SYS_MODE_ACPI): 180 181 AcpiGbl_OriginalMode = SYS_MODE_ACPI; 182 DEBUG_PRINT (ACPI_INFO, ("System supports ACPI mode only.\n")); 183 break; 184 185 186 case (SYS_MODE_LEGACY): 187 188 AcpiGbl_OriginalMode = SYS_MODE_LEGACY; 189 DEBUG_PRINT (ACPI_INFO, 190 ("Tables loaded from buffer, hardware assumed to support LEGACY mode only.\n")); 191 break; 192 193 194 case (SYS_MODE_ACPI | SYS_MODE_LEGACY): 195 196 if (AcpiHwGetMode () == SYS_MODE_ACPI) 197 { 198 AcpiGbl_OriginalMode = SYS_MODE_ACPI; 199 } 200 else 201 { 202 AcpiGbl_OriginalMode = SYS_MODE_LEGACY; 203 } 204 205 DEBUG_PRINT (ACPI_INFO, 206 ("System supports both ACPI and LEGACY modes.\n")); 207 208 DEBUG_PRINT (ACPI_INFO, 209 ("System is currently in %s mode.\n", 210 (AcpiGbl_OriginalMode == SYS_MODE_ACPI) ? "ACPI" : "LEGACY")); 211 break; 212 } 213 214 215 if (AcpiGbl_SystemFlags & SYS_MODE_ACPI) 216 { 217 /* Target system supports ACPI mode */ 218 219 /* 220 * The purpose of this block of code is to save the initial state 221 * of the ACPI event enable registers. An exit function will be 222 * registered which will restore this state when the application 223 * exits. The exit function will also clear all of the ACPI event 224 * status bits prior to restoring the original mode. 225 * 226 * The location of the PM1aEvtBlk enable registers is defined as the 227 * base of PM1aEvtBlk + PM1aEvtBlkLength / 2. Since the spec further 228 * fully defines the PM1aEvtBlk to be a total of 4 bytes, the offset 229 * for the enable registers is always 2 from the base. It is hard 230 * coded here. If this changes in the spec, this code will need to 231 * be modified. The PM1bEvtBlk behaves as expected. 232 */ 233 234 AcpiGbl_Pm1EnableRegisterSave = 235 AcpiOsIn16 ((AcpiGbl_FACP->Pm1aEvtBlk + 2)); 236 if (AcpiGbl_FACP->Pm1bEvtBlk) 237 { 238 AcpiGbl_Pm1EnableRegisterSave |= 239 AcpiOsIn16 ((AcpiGbl_FACP->Pm1bEvtBlk + 2)); 240 } 241 242 243 /* 244 * The GPEs behave similarly, except that the length of the register 245 * block is not fixed, so the buffer must be allocated with malloc 246 */ 247 248 if (AcpiGbl_FACP->Gpe0Blk && AcpiGbl_FACP->Gpe0BlkLen) 249 { 250 /* GPE0 specified in FACP */ 251 252 AcpiGbl_Gpe0EnableRegisterSave = 253 AcpiCmAllocate (DIV_2 (AcpiGbl_FACP->Gpe0BlkLen)); 254 if (!AcpiGbl_Gpe0EnableRegisterSave) 255 { 256 return_ACPI_STATUS (AE_NO_MEMORY); 257 } 258 259 /* Save state of GPE0 enable bits */ 260 261 for (Index = 0; Index < DIV_2 (AcpiGbl_FACP->Gpe0BlkLen); Index++) 262 { 263 AcpiGbl_Gpe0EnableRegisterSave[Index] = 264 AcpiOsIn8 (AcpiGbl_FACP->Gpe0Blk + 265 DIV_2 (AcpiGbl_FACP->Gpe0BlkLen)); 266 } 267 } 268 269 else 270 { 271 AcpiGbl_Gpe0EnableRegisterSave = NULL; 272 } 273 274 if (AcpiGbl_FACP->Gpe1Blk && AcpiGbl_FACP->Gpe1BlkLen) 275 { 276 /* GPE1 defined */ 277 278 AcpiGbl_Gpe1EnableRegisterSave = 279 AcpiCmAllocate (DIV_2 (AcpiGbl_FACP->Gpe1BlkLen)); 280 if (!AcpiGbl_Gpe1EnableRegisterSave) 281 { 282 return_ACPI_STATUS (AE_NO_MEMORY); 283 } 284 285 /* save state of GPE1 enable bits */ 286 287 for (Index = 0; Index < DIV_2 (AcpiGbl_FACP->Gpe1BlkLen); Index++) 288 { 289 AcpiGbl_Gpe1EnableRegisterSave[Index] = 290 AcpiOsIn8 (AcpiGbl_FACP->Gpe1Blk + 291 DIV_2 (AcpiGbl_FACP->Gpe1BlkLen)); 292 } 293 } 294 295 else 296 { 297 AcpiGbl_Gpe1EnableRegisterSave = NULL; 298 } 299 } 300 301 return_ACPI_STATUS (Status); 302} 303 304 305/****************************************************************************** 306 * 307 * FUNCTION: AcpiHwSetMode 308 * 309 * PARAMETERS: Mode - SYS_MODE_ACPI or SYS_MODE_LEGACY 310 * 311 * RETURN: Status 312 * 313 * DESCRIPTION: Transitions the system into the requested mode or does nothing 314 * if the system is already in that mode. 315 * 316 ******************************************************************************/ 317 318ACPI_STATUS 319AcpiHwSetMode ( 320 UINT32 Mode) 321{ 322 323 ACPI_STATUS Status = AE_ERROR; 324 325 FUNCTION_TRACE ("HwSetMode"); 326 327 328 if (Mode == SYS_MODE_ACPI) 329 { 330 /* BIOS should have disabled ALL fixed and GP events */ 331 332 AcpiOsOut8 (AcpiGbl_FACP->SmiCmd, AcpiGbl_FACP->AcpiEnable); 333 DEBUG_PRINT (ACPI_INFO, ("Attempting to enable ACPI mode\n")); 334 } 335 336 else if (Mode == SYS_MODE_LEGACY) 337 { 338 /* 339 * BIOS should clear all fixed status bits and restore fixed event 340 * enable bits to default 341 */ 342 343 AcpiOsOut8 (AcpiGbl_FACP->SmiCmd, AcpiGbl_FACP->AcpiDisable); 344 DEBUG_PRINT (ACPI_INFO, 345 ("Attempting to enable Legacy (non-ACPI) mode\n")); 346 } 347 348 if (AcpiHwGetMode () == Mode) 349 { 350 DEBUG_PRINT (ACPI_INFO, ("Mode %d successfully enabled\n", Mode)); 351 Status = AE_OK; 352 } 353 354 return_ACPI_STATUS (Status); 355} 356 357 358/****************************************************************************** 359 * 360 * FUNCTION: AcpiHwGetMode 361 * 362 * PARAMETERS: none 363 * 364 * RETURN: SYS_MODE_ACPI or SYS_MODE_LEGACY 365 * 366 * DESCRIPTION: Return current operating state of system. Determined by 367 * querying the SCI_EN bit. 368 * 369 ******************************************************************************/ 370 371UINT32 372AcpiHwGetMode (void) 373{ 374 375 FUNCTION_TRACE ("HwGetMode"); 376 377 378 if (AcpiHwRegisterAccess (ACPI_READ, ACPI_MTX_LOCK, SCI_EN)) 379 { 380 return_VALUE (SYS_MODE_ACPI); 381 } 382 else 383 { 384 return_VALUE (SYS_MODE_LEGACY); 385 } 386} 387 388/****************************************************************************** 389 * 390 * FUNCTION: AcpiHwGetModeCapabilities 391 * 392 * PARAMETERS: none 393 * 394 * RETURN: logical OR of SYS_MODE_ACPI and SYS_MODE_LEGACY determined at initial 395 * system state. 396 * 397 * DESCRIPTION: Returns capablities of system 398 * 399 ******************************************************************************/ 400 401UINT32 402AcpiHwGetModeCapabilities (void) 403{ 404 405 FUNCTION_TRACE ("HwGetModeCapabilities"); 406 407 408 if (!(AcpiGbl_SystemFlags & SYS_MODES_MASK)) 409 { 410 if (AcpiHwGetMode () == SYS_MODE_LEGACY) 411 { 412 /* 413 * Assume that if this call is being made, AcpiInit has been called 414 * and ACPI support has been established by the presence of the 415 * tables. Therefore since we're in SYS_MODE_LEGACY, the system 416 * must support both modes 417 */ 418 419 AcpiGbl_SystemFlags |= (SYS_MODE_ACPI | SYS_MODE_LEGACY); 420 } 421 422 else 423 { 424 /* TBD: [Investigate] !!! this may be unsafe... */ 425 /* 426 * system is is ACPI mode, so try to switch back to LEGACY to see if 427 * it is supported 428 */ 429 AcpiHwSetMode (SYS_MODE_LEGACY); 430 431 if (AcpiHwGetMode () == SYS_MODE_LEGACY) 432 { 433 /* Now in SYS_MODE_LEGACY, so both are supported */ 434 435 AcpiGbl_SystemFlags |= (SYS_MODE_ACPI | SYS_MODE_LEGACY); 436 AcpiHwSetMode (SYS_MODE_ACPI); 437 } 438 439 else 440 { 441 /* Still in SYS_MODE_ACPI so this must be an ACPI only system */ 442 443 AcpiGbl_SystemFlags |= SYS_MODE_ACPI; 444 } 445 } 446 } 447 448 return_VALUE (AcpiGbl_SystemFlags & SYS_MODES_MASK); 449} 450 451 452/****************************************************************************** 453 * 454 * FUNCTION: AcpiHwPmtTicks 455 * 456 * PARAMETERS: none 457 * 458 * RETURN: Current value of the ACPI PMT (timer) 459 * 460 * DESCRIPTION: Obtains current value of ACPI PMT 461 * 462 ******************************************************************************/ 463 464UINT32 465AcpiHwPmtTicks (void) 466{ 467 UINT32 Ticks; 468 469 FUNCTION_TRACE ("AcpiPmtTicks"); 470 471 Ticks = AcpiOsIn32 (AcpiGbl_FACP->PmTmrBlk); 472 473 return_VALUE (Ticks); 474} 475 476 477/****************************************************************************** 478 * 479 * FUNCTION: AcpiHwPmtResolution 480 * 481 * PARAMETERS: none 482 * 483 * RETURN: Number of bits of resolution in the PMT (either 24 or 32) 484 * 485 * DESCRIPTION: Obtains resolution of the ACPI PMT (either 24bit or 32bit) 486 * 487 ******************************************************************************/ 488 489UINT32 490AcpiHwPmtResolution (void) 491{ 492 FUNCTION_TRACE ("AcpiPmtResolution"); 493 494 if (0 == AcpiGbl_FACP->TmrValExt) 495 { 496 return_VALUE (24); 497 } 498 499 return_VALUE (32); 500} 501 502