1 /****************************************************************************** 2 * 3 * Module Name: exserial - FieldUnit support for serial address spaces 4 * 5 *****************************************************************************/ 6 7 /****************************************************************************** 8 * 9 * 1. Copyright Notice 10 * 11 * Some or all of this work - Copyright (c) 1999 - 2021, Intel Corp. 12 * All rights reserved. 13 * 14 * 2. License 15 * 16 * 2.1. This is your license from Intel Corp. under its intellectual property 17 * rights. You may have additional license terms from the party that provided 18 * you this software, covering your right to use that party's intellectual 19 * property rights. 20 * 21 * 2.2. Intel grants, free of charge, to any person ("Licensee") obtaining a 22 * copy of the source code appearing in this file ("Covered Code") an 23 * irrevocable, perpetual, worldwide license under Intel's copyrights in the 24 * base code distributed originally by Intel ("Original Intel Code") to copy, 25 * make derivatives, distribute, use and display any portion of the Covered 26 * Code in any form, with the right to sublicense such rights; and 27 * 28 * 2.3. Intel grants Licensee a non-exclusive and non-transferable patent 29 * license (with the right to sublicense), under only those claims of Intel 30 * patents that are infringed by the Original Intel Code, to make, use, sell, 31 * offer to sell, and import the Covered Code and derivative works thereof 32 * solely to the minimum extent necessary to exercise the above copyright 33 * license, and in no event shall the patent license extend to any additions 34 * to or modifications of the Original Intel Code. No other license or right 35 * is granted directly or by implication, estoppel or otherwise; 36 * 37 * The above copyright and patent license is granted only if the following 38 * conditions are met: 39 * 40 * 3. Conditions 41 * 42 * 3.1. Redistribution of Source with Rights to Further Distribute Source. 43 * Redistribution of source code of any substantial portion of the Covered 44 * Code or modification with rights to further distribute source must include 45 * the above Copyright Notice, the above License, this list of Conditions, 46 * and the following Disclaimer and Export Compliance provision. In addition, 47 * Licensee must cause all Covered Code to which Licensee contributes to 48 * contain a file documenting the changes Licensee made to create that Covered 49 * Code and the date of any change. Licensee must include in that file the 50 * documentation of any changes made by any predecessor Licensee. Licensee 51 * must include a prominent statement that the modification is derived, 52 * directly or indirectly, from Original Intel Code. 53 * 54 * 3.2. Redistribution of Source with no Rights to Further Distribute Source. 55 * Redistribution of source code of any substantial portion of the Covered 56 * Code or modification without rights to further distribute source must 57 * include the following Disclaimer and Export Compliance provision in the 58 * documentation and/or other materials provided with distribution. In 59 * addition, Licensee may not authorize further sublicense of source of any 60 * portion of the Covered Code, and must include terms to the effect that the 61 * license from Licensee to its licensee is limited to the intellectual 62 * property embodied in the software Licensee provides to its licensee, and 63 * not to intellectual property embodied in modifications its licensee may 64 * make. 65 * 66 * 3.3. Redistribution of Executable. Redistribution in executable form of any 67 * substantial portion of the Covered Code or modification must reproduce the 68 * above Copyright Notice, and the following Disclaimer and Export Compliance 69 * provision in the documentation and/or other materials provided with the 70 * distribution. 71 * 72 * 3.4. Intel retains all right, title, and interest in and to the Original 73 * Intel Code. 74 * 75 * 3.5. Neither the name Intel nor any other trademark owned or controlled by 76 * Intel shall be used in advertising or otherwise to promote the sale, use or 77 * other dealings in products derived from or relating to the Covered Code 78 * without prior written authorization from Intel. 79 * 80 * 4. Disclaimer and Export Compliance 81 * 82 * 4.1. INTEL MAKES NO WARRANTY OF ANY KIND REGARDING ANY SOFTWARE PROVIDED 83 * HERE. ANY SOFTWARE ORIGINATING FROM INTEL OR DERIVED FROM INTEL SOFTWARE 84 * IS PROVIDED "AS IS," AND INTEL WILL NOT PROVIDE ANY SUPPORT, ASSISTANCE, 85 * INSTALLATION, TRAINING OR OTHER SERVICES. INTEL WILL NOT PROVIDE ANY 86 * UPDATES, ENHANCEMENTS OR EXTENSIONS. INTEL SPECIFICALLY DISCLAIMS ANY 87 * IMPLIED WARRANTIES OF MERCHANTABILITY, NONINFRINGEMENT AND FITNESS FOR A 88 * PARTICULAR PURPOSE. 89 * 90 * 4.2. IN NO EVENT SHALL INTEL HAVE ANY LIABILITY TO LICENSEE, ITS LICENSEES 91 * OR ANY OTHER THIRD PARTY, FOR ANY LOST PROFITS, LOST DATA, LOSS OF USE OR 92 * COSTS OF PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES, OR FOR ANY INDIRECT, 93 * SPECIAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THIS AGREEMENT, UNDER ANY 94 * CAUSE OF ACTION OR THEORY OF LIABILITY, AND IRRESPECTIVE OF WHETHER INTEL 95 * HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES. THESE LIMITATIONS 96 * SHALL APPLY NOTWITHSTANDING THE FAILURE OF THE ESSENTIAL PURPOSE OF ANY 97 * LIMITED REMEDY. 98 * 99 * 4.3. Licensee shall not export, either directly or indirectly, any of this 100 * software or system incorporating such software without first obtaining any 101 * required license or other approval from the U. S. Department of Commerce or 102 * any other agency or department of the United States Government. In the 103 * event Licensee exports any such software from the United States or 104 * re-exports any such software from a foreign destination, Licensee shall 105 * ensure that the distribution and export/re-export of the software is in 106 * compliance with all laws, regulations, orders, or other restrictions of the 107 * U.S. Export Administration Regulations. Licensee agrees that neither it nor 108 * any of its subsidiaries will export/re-export any technical data, process, 109 * software, or service, directly or indirectly, to any country for which the 110 * United States government or any agency thereof requires an export license, 111 * other governmental approval, or letter of assurance, without first obtaining 112 * such license, approval or letter. 113 * 114 ***************************************************************************** 115 * 116 * Alternatively, you may choose to be licensed under the terms of the 117 * following license: 118 * 119 * Redistribution and use in source and binary forms, with or without 120 * modification, are permitted provided that the following conditions 121 * are met: 122 * 1. Redistributions of source code must retain the above copyright 123 * notice, this list of conditions, and the following disclaimer, 124 * without modification. 125 * 2. Redistributions in binary form must reproduce at minimum a disclaimer 126 * substantially similar to the "NO WARRANTY" disclaimer below 127 * ("Disclaimer") and any redistribution must be conditioned upon 128 * including a substantially similar Disclaimer requirement for further 129 * binary redistribution. 130 * 3. Neither the names of the above-listed copyright holders nor the names 131 * of any contributors may be used to endorse or promote products derived 132 * from this software without specific prior written permission. 133 * 134 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 135 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 136 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 137 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 138 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 139 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 140 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 141 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 142 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 143 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 144 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 145 * 146 * Alternatively, you may choose to be licensed under the terms of the 147 * GNU General Public License ("GPL") version 2 as published by the Free 148 * Software Foundation. 149 * 150 *****************************************************************************/ 151 152 #include "acpi.h" 153 #include "accommon.h" 154 #include "acdispat.h" 155 #include "acinterp.h" 156 #include "amlcode.h" 157 158 159 #define _COMPONENT ACPI_EXECUTER 160 ACPI_MODULE_NAME ("exserial") 161 162 163 /******************************************************************************* 164 * 165 * FUNCTION: AcpiExReadGpio 166 * 167 * PARAMETERS: ObjDesc - The named field to read 168 * Buffer - Where the return data is returned 169 * 170 * RETURN: Status 171 * 172 * DESCRIPTION: Read from a named field that references a Generic Serial Bus 173 * field 174 * 175 ******************************************************************************/ 176 177 ACPI_STATUS 178 AcpiExReadGpio ( 179 ACPI_OPERAND_OBJECT *ObjDesc, 180 void *Buffer) 181 { 182 ACPI_STATUS Status; 183 184 185 ACPI_FUNCTION_TRACE_PTR (ExReadGpio, ObjDesc); 186 187 188 /* 189 * For GPIO (GeneralPurposeIo), the Address will be the bit offset 190 * from the previous Connection() operator, making it effectively a 191 * pin number index. The BitLength is the length of the field, which 192 * is thus the number of pins. 193 */ 194 ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD, 195 "GPIO FieldRead [FROM]: Pin %u Bits %u\n", 196 ObjDesc->Field.PinNumberIndex, ObjDesc->Field.BitLength)); 197 198 /* Lock entire transaction if requested */ 199 200 AcpiExAcquireGlobalLock (ObjDesc->CommonField.FieldFlags); 201 202 /* Perform the read */ 203 204 Status = AcpiExAccessRegion ( 205 ObjDesc, 0, (UINT64 *) Buffer, ACPI_READ); 206 207 AcpiExReleaseGlobalLock (ObjDesc->CommonField.FieldFlags); 208 return_ACPI_STATUS (Status); 209 } 210 211 212 /******************************************************************************* 213 * 214 * FUNCTION: AcpiExWriteGpio 215 * 216 * PARAMETERS: SourceDesc - Contains data to write. Expect to be 217 * an Integer object. 218 * ObjDesc - The named field 219 * ResultDesc - Where the return value is returned, if any 220 * 221 * RETURN: Status 222 * 223 * DESCRIPTION: Write to a named field that references a General Purpose I/O 224 * field. 225 * 226 ******************************************************************************/ 227 228 ACPI_STATUS 229 AcpiExWriteGpio ( 230 ACPI_OPERAND_OBJECT *SourceDesc, 231 ACPI_OPERAND_OBJECT *ObjDesc, 232 ACPI_OPERAND_OBJECT **ReturnBuffer) 233 { 234 ACPI_STATUS Status; 235 void *Buffer; 236 237 238 ACPI_FUNCTION_TRACE_PTR (ExWriteGpio, ObjDesc); 239 240 241 /* 242 * For GPIO (GeneralPurposeIo), we will bypass the entire field 243 * mechanism and handoff the bit address and bit width directly to 244 * the handler. The Address will be the bit offset 245 * from the previous Connection() operator, making it effectively a 246 * pin number index. The BitLength is the length of the field, which 247 * is thus the number of pins. 248 */ 249 if (SourceDesc->Common.Type != ACPI_TYPE_INTEGER) 250 { 251 return_ACPI_STATUS (AE_AML_OPERAND_TYPE); 252 } 253 254 ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD, 255 "GPIO FieldWrite [FROM]: (%s:%X), Value %.8X [TO]: Pin %u Bits %u\n", 256 AcpiUtGetTypeName (SourceDesc->Common.Type), 257 SourceDesc->Common.Type, (UINT32) SourceDesc->Integer.Value, 258 ObjDesc->Field.PinNumberIndex, ObjDesc->Field.BitLength)); 259 260 Buffer = &SourceDesc->Integer.Value; 261 262 /* Lock entire transaction if requested */ 263 264 AcpiExAcquireGlobalLock (ObjDesc->CommonField.FieldFlags); 265 266 /* Perform the write */ 267 268 Status = AcpiExAccessRegion ( 269 ObjDesc, 0, (UINT64 *) Buffer, ACPI_WRITE); 270 AcpiExReleaseGlobalLock (ObjDesc->CommonField.FieldFlags); 271 return_ACPI_STATUS (Status); 272 } 273 274 275 /******************************************************************************* 276 * 277 * FUNCTION: AcpiExReadSerialBus 278 * 279 * PARAMETERS: ObjDesc - The named field to read 280 * ReturnBuffer - Where the return value is returned, if any 281 * 282 * RETURN: Status 283 * 284 * DESCRIPTION: Read from a named field that references a serial bus 285 * (SMBus, IPMI, or GSBus). 286 * 287 ******************************************************************************/ 288 289 ACPI_STATUS 290 AcpiExReadSerialBus ( 291 ACPI_OPERAND_OBJECT *ObjDesc, 292 ACPI_OPERAND_OBJECT **ReturnBuffer) 293 { 294 ACPI_STATUS Status; 295 UINT32 BufferLength; 296 ACPI_OPERAND_OBJECT *BufferDesc; 297 UINT32 Function; 298 UINT16 AccessorType; 299 300 301 ACPI_FUNCTION_TRACE_PTR (ExReadSerialBus, ObjDesc); 302 303 304 /* 305 * This is an SMBus, GSBus or IPMI read. We must create a buffer to 306 * hold the data and then directly access the region handler. 307 * 308 * Note: SMBus and GSBus protocol value is passed in upper 16-bits 309 * of Function 310 * 311 * Common buffer format: 312 * Status; (Byte 0 of the data buffer) 313 * Length; (Byte 1 of the data buffer) 314 * Data[x-1]: (Bytes 2-x of the arbitrary length data buffer) 315 */ 316 switch (ObjDesc->Field.RegionObj->Region.SpaceId) 317 { 318 case ACPI_ADR_SPACE_SMBUS: 319 320 BufferLength = ACPI_SMBUS_BUFFER_SIZE; 321 Function = ACPI_READ | (ObjDesc->Field.Attribute << 16); 322 break; 323 324 case ACPI_ADR_SPACE_IPMI: 325 326 BufferLength = ACPI_IPMI_BUFFER_SIZE; 327 Function = ACPI_READ; 328 break; 329 330 case ACPI_ADR_SPACE_GSBUS: 331 332 AccessorType = ObjDesc->Field.Attribute; 333 if (AccessorType == AML_FIELD_ATTRIB_RAW_PROCESS_BYTES) 334 { 335 ACPI_ERROR ((AE_INFO, 336 "Invalid direct read using bidirectional write-then-read protocol")); 337 338 return_ACPI_STATUS (AE_AML_PROTOCOL); 339 } 340 341 Status = AcpiExGetProtocolBufferLength (AccessorType, &BufferLength); 342 if (ACPI_FAILURE (Status)) 343 { 344 ACPI_ERROR ((AE_INFO, 345 "Invalid protocol ID for GSBus: 0x%4.4X", AccessorType)); 346 347 return_ACPI_STATUS (Status); 348 } 349 350 /* Add header length to get the full size of the buffer */ 351 352 BufferLength += ACPI_SERIAL_HEADER_SIZE; 353 Function = ACPI_READ | (AccessorType << 16); 354 break; 355 356 default: 357 return_ACPI_STATUS (AE_AML_INVALID_SPACE_ID); 358 } 359 360 /* Create the local transfer buffer that is returned to the caller */ 361 362 BufferDesc = AcpiUtCreateBufferObject (BufferLength); 363 if (!BufferDesc) 364 { 365 return_ACPI_STATUS (AE_NO_MEMORY); 366 } 367 368 /* Lock entire transaction if requested */ 369 370 AcpiExAcquireGlobalLock (ObjDesc->CommonField.FieldFlags); 371 372 /* Call the region handler for the write-then-read */ 373 374 Status = AcpiExAccessRegion (ObjDesc, 0, 375 ACPI_CAST_PTR (UINT64, BufferDesc->Buffer.Pointer), Function); 376 AcpiExReleaseGlobalLock (ObjDesc->CommonField.FieldFlags); 377 378 *ReturnBuffer = BufferDesc; 379 return_ACPI_STATUS (Status); 380 } 381 382 383 /******************************************************************************* 384 * 385 * FUNCTION: AcpiExWriteSerialBus 386 * 387 * PARAMETERS: SourceDesc - Contains data to write 388 * ObjDesc - The named field 389 * ReturnBuffer - Where the return value is returned, if any 390 * 391 * RETURN: Status 392 * 393 * DESCRIPTION: Write to a named field that references a serial bus 394 * (SMBus, IPMI, GSBus). 395 * 396 ******************************************************************************/ 397 398 ACPI_STATUS 399 AcpiExWriteSerialBus ( 400 ACPI_OPERAND_OBJECT *SourceDesc, 401 ACPI_OPERAND_OBJECT *ObjDesc, 402 ACPI_OPERAND_OBJECT **ReturnBuffer) 403 { 404 ACPI_STATUS Status; 405 UINT32 BufferLength; 406 UINT32 DataLength; 407 void *Buffer; 408 ACPI_OPERAND_OBJECT *BufferDesc; 409 UINT32 Function; 410 UINT16 AccessorType; 411 412 413 ACPI_FUNCTION_TRACE_PTR (ExWriteSerialBus, ObjDesc); 414 415 416 /* 417 * This is an SMBus, GSBus or IPMI write. We will bypass the entire 418 * field mechanism and handoff the buffer directly to the handler. 419 * For these address spaces, the buffer is bidirectional; on a 420 * write, return data is returned in the same buffer. 421 * 422 * Source must be a buffer of sufficient size, these are fixed size: 423 * ACPI_SMBUS_BUFFER_SIZE, or ACPI_IPMI_BUFFER_SIZE. 424 * 425 * Note: SMBus and GSBus protocol type is passed in upper 16-bits 426 * of Function 427 * 428 * Common buffer format: 429 * Status; (Byte 0 of the data buffer) 430 * Length; (Byte 1 of the data buffer) 431 * Data[x-1]: (Bytes 2-x of the arbitrary length data buffer) 432 */ 433 if (SourceDesc->Common.Type != ACPI_TYPE_BUFFER) 434 { 435 ACPI_ERROR ((AE_INFO, 436 "SMBus/IPMI/GenericSerialBus write requires " 437 "Buffer, found type %s", 438 AcpiUtGetObjectTypeName (SourceDesc))); 439 440 return_ACPI_STATUS (AE_AML_OPERAND_TYPE); 441 } 442 443 switch (ObjDesc->Field.RegionObj->Region.SpaceId) 444 { 445 case ACPI_ADR_SPACE_SMBUS: 446 447 BufferLength = ACPI_SMBUS_BUFFER_SIZE; 448 Function = ACPI_WRITE | (ObjDesc->Field.Attribute << 16); 449 break; 450 451 case ACPI_ADR_SPACE_IPMI: 452 453 BufferLength = ACPI_IPMI_BUFFER_SIZE; 454 Function = ACPI_WRITE; 455 break; 456 457 case ACPI_ADR_SPACE_GSBUS: 458 459 AccessorType = ObjDesc->Field.Attribute; 460 Status = AcpiExGetProtocolBufferLength (AccessorType, &BufferLength); 461 if (ACPI_FAILURE (Status)) 462 { 463 ACPI_ERROR ((AE_INFO, 464 "Invalid protocol ID for GSBus: 0x%4.4X", AccessorType)); 465 466 return_ACPI_STATUS (Status); 467 } 468 469 /* Add header length to get the full size of the buffer */ 470 471 BufferLength += ACPI_SERIAL_HEADER_SIZE; 472 Function = ACPI_WRITE | (AccessorType << 16); 473 break; 474 475 default: 476 return_ACPI_STATUS (AE_AML_INVALID_SPACE_ID); 477 } 478 479 /* Create the transfer/bidirectional/return buffer */ 480 481 BufferDesc = AcpiUtCreateBufferObject (BufferLength); 482 if (!BufferDesc) 483 { 484 return_ACPI_STATUS (AE_NO_MEMORY); 485 } 486 487 /* Copy the input buffer data to the transfer buffer */ 488 489 Buffer = BufferDesc->Buffer.Pointer; 490 DataLength = (BufferLength < SourceDesc->Buffer.Length ? 491 BufferLength : SourceDesc->Buffer.Length); 492 memcpy (Buffer, SourceDesc->Buffer.Pointer, DataLength); 493 494 /* Lock entire transaction if requested */ 495 496 AcpiExAcquireGlobalLock (ObjDesc->CommonField.FieldFlags); 497 498 /* 499 * Perform the write (returns status and perhaps data in the 500 * same buffer) 501 */ 502 Status = AcpiExAccessRegion ( 503 ObjDesc, 0, (UINT64 *) Buffer, Function); 504 AcpiExReleaseGlobalLock (ObjDesc->CommonField.FieldFlags); 505 506 *ReturnBuffer = BufferDesc; 507 return_ACPI_STATUS (Status); 508 } 509