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