drivers/acpi/resources/rsirq.c

   1 /*******************************************************************************
   2  *
   3  * Module Name: rsirq - IRQ resource descriptors
   4  *
   5  ******************************************************************************/
   6
   7 /*
   8  * Copyright (C) 2000 - 2005, R. Byron Moore
   9  * All rights reserved.
  10  *
  11  * Redistribution and use in source and binary forms, with or without
  12  * modification, are permitted provided that the following conditions
  13  * are met:
  14  * 1. Redistributions of source code must retain the above copyright
  15  *    notice, this list of conditions, and the following disclaimer,
  16  *    without modification.
  17  * 2. Redistributions in binary form must reproduce at minimum a disclaimer
  18  *    substantially similar to the "NO WARRANTY" disclaimer below
  19  *    ("Disclaimer") and any redistribution must be conditioned upon
  20  *    including a substantially similar Disclaimer requirement for further
  21  *    binary redistribution.
  22  * 3. Neither the names of the above-listed copyright holders nor the names
  23  *    of any contributors may be used to endorse or promote products derived
  24  *    from this software without specific prior written permission.
  25  *
  26  * Alternatively, this software may be distributed under the terms of the
  27  * GNU General Public License ("GPL") version 2 as published by the Free
  28  * Software Foundation.
  29  *
  30  * NO WARRANTY
  31  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  32  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  33  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
  34  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  35  * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  36  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  37  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  38  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  39  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
  40  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  41  * POSSIBILITY OF SUCH DAMAGES.
  42  */
  43
  44
  45 #include <acpi/acpi.h>
  46 #include <acpi/acresrc.h>
  47
  48 #define _COMPONENT          ACPI_RESOURCES
  49          ACPI_MODULE_NAME    ("rsirq")
  50
  51
  52 /*******************************************************************************
  53  *
  54  * FUNCTION:    acpi_rs_irq_resource
  55  *
  56  * PARAMETERS:  byte_stream_buffer      - Pointer to the resource input byte
  57  *                                        stream
  58  *              bytes_consumed          - Pointer to where the number of bytes
  59  *                                        consumed the byte_stream_buffer is
  60  *                                        returned
  61  *              output_buffer           - Pointer to the return data buffer
  62  *              structure_size          - Pointer to where the number of bytes
  63  *                                        in the return data struct is returned
  64  *
  65  * RETURN:      Status
  66  *
  67  * DESCRIPTION: Take the resource byte stream and fill out the appropriate
  68  *              structure pointed to by the output_buffer. Return the
  69  *              number of bytes consumed from the byte stream.
  70  *
  71  ******************************************************************************/
  72
  73 acpi_status
  74 acpi_rs_irq_resource (
  75         u8                              *byte_stream_buffer,
  76         acpi_size                       *bytes_consumed,
  77         u8                              **output_buffer,
  78         acpi_size                       *structure_size)
  79 {
  80         u8                              *buffer = byte_stream_buffer;
  81         struct acpi_resource            *output_struct = (void *) *output_buffer;
  82         u16                             temp16 = 0;
  83         u8                              temp8 = 0;
  84         u8                              index;
  85         u8                              i;
  86         acpi_size                       struct_size = ACPI_SIZEOF_RESOURCE (
  87                           struct acpi_resource_irq);
  88
  89
  90         ACPI_FUNCTION_TRACE ("rs_irq_resource");
  91
  92
  93         /*
  94          * The number of bytes consumed are contained in the descriptor
  95          * (Bits:0-1)
  96          */
  97         temp8 = *buffer;
  98         *bytes_consumed = (temp8 & 0x03) + 1;
  99         output_struct->id = ACPI_RSTYPE_IRQ;
 100
 101         /* Point to the 16-bits of Bytes 1 and 2 */
 102
 103         buffer += 1;
 104         ACPI_MOVE_16_TO_16 (&temp16, buffer);
 105
 106         output_struct->data.irq.number_of_interrupts = 0;
 107
 108         /* Decode the IRQ bits */
 109
 110         for (i = 0, index = 0; index < 16; index++) {
 111                 if ((temp16 >> index) & 0x01) {
 112                         output_struct->data.irq.interrupts[i] = index;
 113                         i++;
 114                 }
 115         }
 116
 117         /* Zero interrupts is valid */
 118
 119         output_struct->data.irq.number_of_interrupts = i;
 120         if (i > 0) {
 121                 /* Calculate the structure size based upon the number of interrupts */
 122
 123                 struct_size += ((acpi_size) i - 1) * 4;
 124         }
 125
 126         /* Point to Byte 3 if it is used */
 127
 128         if (4 == *bytes_consumed) {
 129                 buffer += 2;
 130                 temp8 = *buffer;
 131
 132                 /* Check for HE, LL interrupts */
 133
 134                 switch (temp8 & 0x09) {
 135                 case 0x01: /* HE */
 136                         output_struct->data.irq.edge_level = ACPI_EDGE_SENSITIVE;
 137                         output_struct->data.irq.active_high_low = ACPI_ACTIVE_HIGH;
 138                         break;
 139
 140                 case 0x08: /* LL */
 141                         output_struct->data.irq.edge_level = ACPI_LEVEL_SENSITIVE;
 142                         output_struct->data.irq.active_high_low = ACPI_ACTIVE_LOW;
 143                         break;
 144
 145                 default:
 146                         /*
 147                          * Only _LL and _HE polarity/trigger interrupts
 148                          * are allowed (ACPI spec, section "IRQ Format")
 149                          * so 0x00 and 0x09 are illegal.
 150                          */
 151                         ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
 152                                 "Invalid interrupt polarity/trigger in resource list, %X\n",
 153                                 temp8));
 154                         return_ACPI_STATUS (AE_BAD_DATA);
 155                 }
 156
 157                 /* Check for sharable */
 158
 159                 output_struct->data.irq.shared_exclusive = (temp8 >> 3) & 0x01;
 160         }
 161         else {
 162                 /*
 163                  * Assume Edge Sensitive, Active High, Non-Sharable
 164                  * per ACPI Specification
 165                  */
 166                 output_struct->data.irq.edge_level = ACPI_EDGE_SENSITIVE;
 167                 output_struct->data.irq.active_high_low = ACPI_ACTIVE_HIGH;
 168                 output_struct->data.irq.shared_exclusive = ACPI_EXCLUSIVE;
 169         }
 170
 171         /* Set the Length parameter */
 172
 173         output_struct->length = (u32) struct_size;
 174
 175         /* Return the final size of the structure */
 176
 177         *structure_size = struct_size;
 178         return_ACPI_STATUS (AE_OK);
 179 }
 180
 181
 182 /*******************************************************************************
 183  *
 184  * FUNCTION:    acpi_rs_irq_stream
 185  *
 186  * PARAMETERS:  linked_list             - Pointer to the resource linked list
 187  *              output_buffer           - Pointer to the user's return buffer
 188  *              bytes_consumed          - Pointer to where the number of bytes
 189  *                                        used in the output_buffer is returned
 190  *
 191  * RETURN:      Status
 192  *
 193  * DESCRIPTION: Take the linked list resource structure and fills in the
 194  *              the appropriate bytes in a byte stream
 195  *
 196  ******************************************************************************/
 197
 198 acpi_status
 199 acpi_rs_irq_stream (
 200         struct acpi_resource            *linked_list,
 201         u8                              **output_buffer,
 202         acpi_size                       *bytes_consumed)
 203 {
 204         u8                              *buffer = *output_buffer;
 205         u16                             temp16 = 0;
 206         u8                              temp8 = 0;
 207         u8                              index;
 208         u8                              IRqinfo_byte_needed;
 209
 210
 211         ACPI_FUNCTION_TRACE ("rs_irq_stream");
 212
 213
 214         /*
 215          * The descriptor field is set based upon whether a third byte is
 216          * needed to contain the IRQ Information.
 217          */
 218         if (ACPI_EDGE_SENSITIVE == linked_list->data.irq.edge_level &&
 219                 ACPI_ACTIVE_HIGH == linked_list->data.irq.active_high_low &&
 220                 ACPI_EXCLUSIVE == linked_list->data.irq.shared_exclusive) {
 221                 *buffer = 0x22;
 222                 IRqinfo_byte_needed = FALSE;
 223         }
 224         else {
 225                 *buffer = 0x23;
 226                 IRqinfo_byte_needed = TRUE;
 227         }
 228
 229         buffer += 1;
 230         temp16 = 0;
 231
 232         /* Loop through all of the interrupts and set the mask bits */
 233
 234         for(index = 0;
 235                 index < linked_list->data.irq.number_of_interrupts;
 236                 index++) {
 237                 temp8 = (u8) linked_list->data.irq.interrupts[index];
 238                 temp16 |= 0x1 << temp8;
 239         }
 240
 241         ACPI_MOVE_16_TO_16 (buffer, &temp16);
 242         buffer += 2;
 243
 244         /* Set the IRQ Info byte if needed. */
 245
 246         if (IRqinfo_byte_needed) {
 247                 temp8 = 0;
 248                 temp8 = (u8) ((linked_list->data.irq.shared_exclusive &
 249                                  0x01) << 4);
 250
 251                 if (ACPI_LEVEL_SENSITIVE == linked_list->data.irq.edge_level &&
 252                         ACPI_ACTIVE_LOW == linked_list->data.irq.active_high_low) {
 253                         temp8 |= 0x08;
 254                 }
 255                 else {
 256                         temp8 |= 0x01;
 257                 }
 258
 259                 *buffer = temp8;
 260                 buffer += 1;
 261         }
 262
 263         /* Return the number of bytes consumed in this operation */
 264
 265         *bytes_consumed = ACPI_PTR_DIFF (buffer, *output_buffer);
 266         return_ACPI_STATUS (AE_OK);
 267 }
 268
 269
 270 /*******************************************************************************
 271  *
 272  * FUNCTION:    acpi_rs_extended_irq_resource
 273  *
 274  * PARAMETERS:  byte_stream_buffer      - Pointer to the resource input byte
 275  *                                        stream
 276  *              bytes_consumed          - Pointer to where the number of bytes
 277  *                                        consumed the byte_stream_buffer is
 278  *                                        returned
 279  *              output_buffer           - Pointer to the return data buffer
 280  *              structure_size          - Pointer to where the number of bytes
 281  *                                        in the return data struct is returned
 282  *
 283  * RETURN:      Status
 284  *
 285  * DESCRIPTION: Take the resource byte stream and fill out the appropriate
 286  *              structure pointed to by the output_buffer. Return the
 287  *              number of bytes consumed from the byte stream.
 288  *
 289  ******************************************************************************/
 290
 291 acpi_status
 292 acpi_rs_extended_irq_resource (
 293         u8                              *byte_stream_buffer,
 294         acpi_size                       *bytes_consumed,
 295         u8                              **output_buffer,
 296         acpi_size                       *structure_size)
 297 {
 298         u8                              *buffer = byte_stream_buffer;
 299         struct acpi_resource            *output_struct = (void *) *output_buffer;
 300         u16                             temp16 = 0;
 301         u8                              temp8 = 0;
 302         u8                              *temp_ptr;
 303         u8                              index;
 304         acpi_size                       struct_size = ACPI_SIZEOF_RESOURCE (
 305                           struct acpi_resource_ext_irq);
 306
 307
 308         ACPI_FUNCTION_TRACE ("rs_extended_irq_resource");
 309
 310
 311         /* Point past the Descriptor to get the number of bytes consumed */
 312
 313         buffer += 1;
 314         ACPI_MOVE_16_TO_16 (&temp16, buffer);
 315
 316         /* Validate minimum descriptor length */
 317
 318         if (temp16 < 6) {
 319                 return_ACPI_STATUS (AE_AML_BAD_RESOURCE_LENGTH);
 320         }
 321
 322         *bytes_consumed = temp16 + 3;
 323         output_struct->id = ACPI_RSTYPE_EXT_IRQ;
 324
 325         /* Point to the Byte3 */
 326
 327         buffer += 2;
 328         temp8 = *buffer;
 329
 330         output_struct->data.extended_irq.producer_consumer = temp8 & 0x01;
 331
 332         /*
 333          * Check for Interrupt Mode
 334          *
 335          * The definition of an Extended IRQ changed between ACPI spec v1.0b
 336          * and ACPI spec 2.0 (section 6.4.3.6 in both).
 337          *
 338          * - Edge/Level are defined opposite in the table vs the headers
 339          */
 340         output_struct->data.extended_irq.edge_level =
 341                 (temp8 & 0x2) ? ACPI_EDGE_SENSITIVE : ACPI_LEVEL_SENSITIVE;
 342
 343         /* Check Interrupt Polarity */
 344
 345         output_struct->data.extended_irq.active_high_low = (temp8 >> 2) & 0x1;
 346
 347         /* Check for sharable */
 348
 349         output_struct->data.extended_irq.shared_exclusive = (temp8 >> 3) & 0x01;
 350
 351         /* Point to Byte4 (IRQ Table length) */
 352
 353         buffer += 1;
 354         temp8 = *buffer;
 355
 356         /* Must have at least one IRQ */
 357
 358         if (temp8 < 1) {
 359                 return_ACPI_STATUS (AE_AML_BAD_RESOURCE_LENGTH);
 360         }
 361
 362         output_struct->data.extended_irq.number_of_interrupts = temp8;
 363
 364         /*
 365          * Add any additional structure size to properly calculate
 366          * the next pointer at the end of this function
 367          */
 368         struct_size += (temp8 - 1) * 4;
 369
 370         /* Point to Byte5 (First IRQ Number) */
 371
 372         buffer += 1;
 373
 374         /* Cycle through every IRQ in the table */
 375
 376         for (index = 0; index < temp8; index++) {
 377                 ACPI_MOVE_32_TO_32 (
 378                         &output_struct->data.extended_irq.interrupts[index], buffer);
 379
 380                 /* Point to the next IRQ */
 381
 382                 buffer += 4;
 383         }
 384
 385         /*
 386          * This will leave us pointing to the Resource Source Index
 387          * If it is present, then save it off and calculate the
 388          * pointer to where the null terminated string goes:
 389          * Each Interrupt takes 32-bits + the 5 bytes of the
 390          * stream that are default.
 391          *
 392          * Note: Some resource descriptors will have an additional null, so
 393          * we add 1 to the length.
 394          */
 395         if (*bytes_consumed >
 396                 ((acpi_size) output_struct->data.extended_irq.number_of_interrupts * 4) +
 397                 (5 + 1)) {
 398                 /* Dereference the Index */
 399
 400                 temp8 = *buffer;
 401                 output_struct->data.extended_irq.resource_source.index = (u32) temp8;
 402
 403                 /* Point to the String */
 404
 405                 buffer += 1;
 406
 407                 /* Point the String pointer to the end of this structure. */
 408
 409                 output_struct->data.extended_irq.resource_source.string_ptr =
 410                                 (char *)((char *) output_struct + struct_size);
 411
 412                 temp_ptr = (u8 *)
 413                         output_struct->data.extended_irq.resource_source.string_ptr;
 414
 415                 /* Copy the string into the buffer */
 416
 417                 index = 0;
 418                 while (0x00 != *buffer) {
 419                         *temp_ptr = *buffer;
 420
 421                         temp_ptr += 1;
 422                         buffer += 1;
 423                         index += 1;
 424                 }
 425
 426                 /* Add the terminating null */
 427
 428                 *temp_ptr = 0x00;
 429                 output_struct->data.extended_irq.resource_source.string_length = index + 1;
 430
 431                 /*
 432                  * In order for the struct_size to fall on a 32-bit boundary,
 433                  * calculate the length of the string and expand the
 434                  * struct_size to the next 32-bit boundary.
 435                  */
 436                 temp8 = (u8) (index + 1);
 437                 struct_size += ACPI_ROUND_UP_to_32_bITS (temp8);
 438         }
 439         else {
 440                 output_struct->data.extended_irq.resource_source.index = 0x00;
 441                 output_struct->data.extended_irq.resource_source.string_length = 0;
 442                 output_struct->data.extended_irq.resource_source.string_ptr = NULL;
 443         }
 444
 445         /* Set the Length parameter */
 446
 447         output_struct->length = (u32) struct_size;
 448
 449         /* Return the final size of the structure */
 450
 451         *structure_size = struct_size;
 452         return_ACPI_STATUS (AE_OK);
 453 }
 454
 455
 456 /*******************************************************************************
 457  *
 458  * FUNCTION:    acpi_rs_extended_irq_stream
 459  *
 460  * PARAMETERS:  linked_list             - Pointer to the resource linked list
 461  *              output_buffer           - Pointer to the user's return buffer
 462  *              bytes_consumed          - Pointer to where the number of bytes
 463  *                                        used in the output_buffer is returned
 464  *
 465  * RETURN:      Status
 466  *
 467  * DESCRIPTION: Take the linked list resource structure and fills in the
 468  *              the appropriate bytes in a byte stream
 469  *
 470  ******************************************************************************/
 471
 472 acpi_status
 473 acpi_rs_extended_irq_stream (
 474         struct acpi_resource            *linked_list,
 475         u8                              **output_buffer,
 476         acpi_size                       *bytes_consumed)
 477 {
 478         u8                              *buffer = *output_buffer;
 479         u16                             *length_field;
 480         u8                              temp8 = 0;
 481         u8                              index;
 482         char                            *temp_pointer = NULL;
 483
 484
 485         ACPI_FUNCTION_TRACE ("rs_extended_irq_stream");
 486
 487
 488         /* The descriptor field is static */
 489
 490         *buffer = 0x89;
 491         buffer += 1;
 492
 493         /* Set a pointer to the Length field - to be filled in later */
 494
 495         length_field = ACPI_CAST_PTR (u16, buffer);
 496         buffer += 2;
 497
 498         /* Set the Interrupt vector flags */
 499
 500         temp8 = (u8)(linked_list->data.extended_irq.producer_consumer & 0x01);
 501         temp8 |= ((linked_list->data.extended_irq.shared_exclusive & 0x01) << 3);
 502
 503         /*
 504          * Set the Interrupt Mode
 505          *
 506          * The definition of an Extended IRQ changed between ACPI spec v1.0b
 507          * and ACPI spec 2.0 (section 6.4.3.6 in both).  This code does not
 508          * implement the more restrictive definition of 1.0b
 509          *
 510          * - Edge/Level are defined opposite in the table vs the headers
 511          */
 512         if (ACPI_EDGE_SENSITIVE == linked_list->data.extended_irq.edge_level) {
 513                 temp8 |= 0x2;
 514         }
 515
 516         /* Set the Interrupt Polarity */
 517
 518         temp8 |= ((linked_list->data.extended_irq.active_high_low & 0x1) << 2);
 519
 520         *buffer = temp8;
 521         buffer += 1;
 522
 523         /* Set the Interrupt table length */
 524
 525         temp8 = (u8) linked_list->data.extended_irq.number_of_interrupts;
 526
 527         *buffer = temp8;
 528         buffer += 1;
 529
 530         for (index = 0; index < linked_list->data.extended_irq.number_of_interrupts;
 531                  index++) {
 532                 ACPI_MOVE_32_TO_32 (buffer,
 533                                   &linked_list->data.extended_irq.interrupts[index]);
 534                 buffer += 4;
 535         }
 536
 537         /* Resource Source Index and Resource Source are optional */
 538
 539         if (0 != linked_list->data.extended_irq.resource_source.string_length) {
 540                 *buffer = (u8) linked_list->data.extended_irq.resource_source.index;
 541                 buffer += 1;
 542
 543                 temp_pointer = (char *) buffer;
 544
 545                 /* Copy the string */
 546
 547                 ACPI_STRCPY (temp_pointer,
 548                         linked_list->data.extended_irq.resource_source.string_ptr);
 549
 550                 /*
 551                  * Buffer needs to be set to the length of the sting + one for the
 552                  * terminating null
 553                  */
 554                 buffer += (acpi_size) (ACPI_STRLEN (
 555                         linked_list->data.extended_irq.resource_source.string_ptr) + 1);
 556         }
 557
 558         /* Return the number of bytes consumed in this operation */
 559
 560         *bytes_consumed = ACPI_PTR_DIFF (buffer, *output_buffer);
 561
 562         /*
 563          * Set the length field to the number of bytes consumed
 564          * minus the header size (3 bytes)
 565          */
 566         *length_field = (u16) (*bytes_consumed - 3);
 567         return_ACPI_STATUS (AE_OK);
 568 }
 569