err.no Git - linux-2.6/blob - drivers/pnp/pnpbios/rsparser.c

   1 /*
   2  * rsparser.c - parses and encodes pnpbios resource data streams
   3  */
   4
   5 #include <linux/ctype.h>
   6 #include <linux/pnp.h>
   7 #include <linux/string.h>
   8 #include <linux/slab.h>
   9
  10 #ifdef CONFIG_PCI
  11 #include <linux/pci.h>
  12 #else
  13 inline void pcibios_penalize_isa_irq(int irq, int active)
  14 {
  15 }
  16 #endif                          /* CONFIG_PCI */
  17
  18 #include "../base.h"
  19 #include "pnpbios.h"
  20
  21 /* standard resource tags */
  22 #define SMALL_TAG_PNPVERNO              0x01
  23 #define SMALL_TAG_LOGDEVID              0x02
  24 #define SMALL_TAG_COMPATDEVID           0x03
  25 #define SMALL_TAG_IRQ                   0x04
  26 #define SMALL_TAG_DMA                   0x05
  27 #define SMALL_TAG_STARTDEP              0x06
  28 #define SMALL_TAG_ENDDEP                0x07
  29 #define SMALL_TAG_PORT                  0x08
  30 #define SMALL_TAG_FIXEDPORT             0x09
  31 #define SMALL_TAG_VENDOR                0x0e
  32 #define SMALL_TAG_END                   0x0f
  33 #define LARGE_TAG                       0x80
  34 #define LARGE_TAG_MEM                   0x81
  35 #define LARGE_TAG_ANSISTR               0x82
  36 #define LARGE_TAG_UNICODESTR            0x83
  37 #define LARGE_TAG_VENDOR                0x84
  38 #define LARGE_TAG_MEM32                 0x85
  39 #define LARGE_TAG_FIXEDMEM32            0x86
  40
  41 /*
  42  * Resource Data Stream Format:
  43  *
  44  * Allocated Resources (required)
  45  * end tag ->
  46  * Resource Configuration Options (optional)
  47  * end tag ->
  48  * Compitable Device IDs (optional)
  49  * final end tag ->
  50  */
  51
  52 /*
  53  * Allocated Resources
  54  */
  55
  56 static void pnpbios_parse_allocated_ioresource(struct pnp_dev *dev,
  57                                                int start, int len)
  58 {
  59         int flags = 0;
  60         int end = start + len - 1;
  61
  62         if (len <= 0 || end >= 0x10003)
  63                 flags |= IORESOURCE_DISABLED;
  64
  65         pnp_add_io_resource(dev, start, end, flags);
  66 }
  67
  68 static void pnpbios_parse_allocated_memresource(struct pnp_dev *dev,
  69                                                 int start, int len)
  70 {
  71         int flags = 0;
  72         int end = start + len - 1;
  73
  74         if (len <= 0)
  75                 flags |= IORESOURCE_DISABLED;
  76
  77         pnp_add_mem_resource(dev, start, end, flags);
  78 }
  79
  80 static unsigned char *pnpbios_parse_allocated_resource_data(struct pnp_dev *dev,
  81                                                             unsigned char *p,
  82                                                             unsigned char *end)
  83 {
  84         unsigned int len, tag;
  85         int io, size, mask, i, flags;
  86
  87         if (!p)
  88                 return NULL;
  89
  90         dev_dbg(&dev->dev, "parse allocated resources\n");
  91
  92         pnp_init_resources(dev);
  93
  94         while ((char *)p < (char *)end) {
  95
  96                 /* determine the type of tag */
  97                 if (p[0] & LARGE_TAG) { /* large tag */
  98                         len = (p[2] << 8) | p[1];
  99                         tag = p[0];
 100                 } else {        /* small tag */
 101                         len = p[0] & 0x07;
 102                         tag = ((p[0] >> 3) & 0x0f);
 103                 }
 104
 105                 switch (tag) {
 106
 107                 case LARGE_TAG_MEM:
 108                         if (len != 9)
 109                                 goto len_err;
 110                         io = *(short *)&p[4];
 111                         size = *(short *)&p[10];
 112                         pnpbios_parse_allocated_memresource(dev, io, size);
 113                         break;
 114
 115                 case LARGE_TAG_ANSISTR:
 116                         /* ignore this for now */
 117                         break;
 118
 119                 case LARGE_TAG_VENDOR:
 120                         /* do nothing */
 121                         break;
 122
 123                 case LARGE_TAG_MEM32:
 124                         if (len != 17)
 125                                 goto len_err;
 126                         io = *(int *)&p[4];
 127                         size = *(int *)&p[16];
 128                         pnpbios_parse_allocated_memresource(dev, io, size);
 129                         break;
 130
 131                 case LARGE_TAG_FIXEDMEM32:
 132                         if (len != 9)
 133                                 goto len_err;
 134                         io = *(int *)&p[4];
 135                         size = *(int *)&p[8];
 136                         pnpbios_parse_allocated_memresource(dev, io, size);
 137                         break;
 138
 139                 case SMALL_TAG_IRQ:
 140                         if (len < 2 || len > 3)
 141                                 goto len_err;
 142                         flags = 0;
 143                         io = -1;
 144                         mask = p[1] + p[2] * 256;
 145                         for (i = 0; i < 16; i++, mask = mask >> 1)
 146                                 if (mask & 0x01)
 147                                         io = i;
 148                         if (io != -1)
 149                                 pcibios_penalize_isa_irq(io, 1);
 150                         else
 151                                 flags = IORESOURCE_DISABLED;
 152                         pnp_add_irq_resource(dev, io, flags);
 153                         break;
 154
 155                 case SMALL_TAG_DMA:
 156                         if (len != 2)
 157                                 goto len_err;
 158                         flags = 0;
 159                         io = -1;
 160                         mask = p[1];
 161                         for (i = 0; i < 8; i++, mask = mask >> 1)
 162                                 if (mask & 0x01)
 163                                         io = i;
 164                         if (io == -1)
 165                                 flags = IORESOURCE_DISABLED;
 166                         pnp_add_dma_resource(dev, io, flags);
 167                         break;
 168
 169                 case SMALL_TAG_PORT:
 170                         if (len != 7)
 171                                 goto len_err;
 172                         io = p[2] + p[3] * 256;
 173                         size = p[7];
 174                         pnpbios_parse_allocated_ioresource(dev, io, size);
 175                         break;
 176
 177                 case SMALL_TAG_VENDOR:
 178                         /* do nothing */
 179                         break;
 180
 181                 case SMALL_TAG_FIXEDPORT:
 182                         if (len != 3)
 183                                 goto len_err;
 184                         io = p[1] + p[2] * 256;
 185                         size = p[3];
 186                         pnpbios_parse_allocated_ioresource(dev, io, size);
 187                         break;
 188
 189                 case SMALL_TAG_END:
 190                         p = p + 2;
 191                         return (unsigned char *)p;
 192                         break;
 193
 194                 default:        /* an unkown tag */
 195 len_err:
 196                         dev_err(&dev->dev, "unknown tag %#x length %d\n",
 197                                 tag, len);
 198                         break;
 199                 }
 200
 201                 /* continue to the next tag */
 202                 if (p[0] & LARGE_TAG)
 203                         p += len + 3;
 204                 else
 205                         p += len + 1;
 206         }
 207
 208         dev_err(&dev->dev, "no end tag in resource structure\n");
 209
 210         return NULL;
 211 }
 212
 213 /*
 214  * Resource Configuration Options
 215  */
 216
 217 static __init void pnpbios_parse_mem_option(struct pnp_dev *dev,
 218                                             unsigned char *p, int size,
 219                                             struct pnp_option *option)
 220 {
 221         struct pnp_mem *mem;
 222
 223         mem = kzalloc(sizeof(struct pnp_mem), GFP_KERNEL);
 224         if (!mem)
 225                 return;
 226         mem->min = ((p[5] << 8) | p[4]) << 8;
 227         mem->max = ((p[7] << 8) | p[6]) << 8;
 228         mem->align = (p[9] << 8) | p[8];
 229         mem->size = ((p[11] << 8) | p[10]) << 8;
 230         mem->flags = p[3];
 231         pnp_register_mem_resource(dev, option, mem);
 232 }
 233
 234 static __init void pnpbios_parse_mem32_option(struct pnp_dev *dev,
 235                                               unsigned char *p, int size,
 236                                               struct pnp_option *option)
 237 {
 238         struct pnp_mem *mem;
 239
 240         mem = kzalloc(sizeof(struct pnp_mem), GFP_KERNEL);
 241         if (!mem)
 242                 return;
 243         mem->min = (p[7] << 24) | (p[6] << 16) | (p[5] << 8) | p[4];
 244         mem->max = (p[11] << 24) | (p[10] << 16) | (p[9] << 8) | p[8];
 245         mem->align = (p[15] << 24) | (p[14] << 16) | (p[13] << 8) | p[12];
 246         mem->size = (p[19] << 24) | (p[18] << 16) | (p[17] << 8) | p[16];
 247         mem->flags = p[3];
 248         pnp_register_mem_resource(dev, option, mem);
 249 }
 250
 251 static __init void pnpbios_parse_fixed_mem32_option(struct pnp_dev *dev,
 252                                                     unsigned char *p, int size,
 253                                                     struct pnp_option *option)
 254 {
 255         struct pnp_mem *mem;
 256
 257         mem = kzalloc(sizeof(struct pnp_mem), GFP_KERNEL);
 258         if (!mem)
 259                 return;
 260         mem->min = mem->max = (p[7] << 24) | (p[6] << 16) | (p[5] << 8) | p[4];
 261         mem->size = (p[11] << 24) | (p[10] << 16) | (p[9] << 8) | p[8];
 262         mem->align = 0;
 263         mem->flags = p[3];
 264         pnp_register_mem_resource(dev, option, mem);
 265 }
 266
 267 static __init void pnpbios_parse_irq_option(struct pnp_dev *dev,
 268                                             unsigned char *p, int size,
 269                                             struct pnp_option *option)
 270 {
 271         struct pnp_irq *irq;
 272         unsigned long bits;
 273
 274         irq = kzalloc(sizeof(struct pnp_irq), GFP_KERNEL);
 275         if (!irq)
 276                 return;
 277         bits = (p[2] << 8) | p[1];
 278         bitmap_copy(irq->map, &bits, 16);
 279         if (size > 2)
 280                 irq->flags = p[3];
 281         else
 282                 irq->flags = IORESOURCE_IRQ_HIGHEDGE;
 283         pnp_register_irq_resource(dev, option, irq);
 284 }
 285
 286 static __init void pnpbios_parse_dma_option(struct pnp_dev *dev,
 287                                             unsigned char *p, int size,
 288                                             struct pnp_option *option)
 289 {
 290         struct pnp_dma *dma;
 291
 292         dma = kzalloc(sizeof(struct pnp_dma), GFP_KERNEL);
 293         if (!dma)
 294                 return;
 295         dma->map = p[1];
 296         dma->flags = p[2];
 297         pnp_register_dma_resource(dev, option, dma);
 298 }
 299
 300 static __init void pnpbios_parse_port_option(struct pnp_dev *dev,
 301                                              unsigned char *p, int size,
 302                                              struct pnp_option *option)
 303 {
 304         struct pnp_port *port;
 305
 306         port = kzalloc(sizeof(struct pnp_port), GFP_KERNEL);
 307         if (!port)
 308                 return;
 309         port->min = (p[3] << 8) | p[2];
 310         port->max = (p[5] << 8) | p[4];
 311         port->align = p[6];
 312         port->size = p[7];
 313         port->flags = p[1] ? PNP_PORT_FLAG_16BITADDR : 0;
 314         pnp_register_port_resource(dev, option, port);
 315 }
 316
 317 static __init void pnpbios_parse_fixed_port_option(struct pnp_dev *dev,
 318                                                    unsigned char *p, int size,
 319                                                    struct pnp_option *option)
 320 {
 321         struct pnp_port *port;
 322
 323         port = kzalloc(sizeof(struct pnp_port), GFP_KERNEL);
 324         if (!port)
 325                 return;
 326         port->min = port->max = (p[2] << 8) | p[1];
 327         port->size = p[3];
 328         port->align = 0;
 329         port->flags = PNP_PORT_FLAG_FIXED;
 330         pnp_register_port_resource(dev, option, port);
 331 }
 332
 333 static __init unsigned char *
 334 pnpbios_parse_resource_option_data(unsigned char *p, unsigned char *end,
 335                                         struct pnp_dev *dev)
 336 {
 337         unsigned int len, tag;
 338         int priority = 0;
 339         struct pnp_option *option, *option_independent;
 340
 341         if (!p)
 342                 return NULL;
 343
 344         dev_dbg(&dev->dev, "parse resource options\n");
 345
 346         option_independent = option = pnp_register_independent_option(dev);
 347         if (!option)
 348                 return NULL;
 349
 350         while ((char *)p < (char *)end) {
 351
 352                 /* determine the type of tag */
 353                 if (p[0] & LARGE_TAG) { /* large tag */
 354                         len = (p[2] << 8) | p[1];
 355                         tag = p[0];
 356                 } else {        /* small tag */
 357                         len = p[0] & 0x07;
 358                         tag = ((p[0] >> 3) & 0x0f);
 359                 }
 360
 361                 switch (tag) {
 362
 363                 case LARGE_TAG_MEM:
 364                         if (len != 9)
 365                                 goto len_err;
 366                         pnpbios_parse_mem_option(dev, p, len, option);
 367                         break;
 368
 369                 case LARGE_TAG_MEM32:
 370                         if (len != 17)
 371                                 goto len_err;
 372                         pnpbios_parse_mem32_option(dev, p, len, option);
 373                         break;
 374
 375                 case LARGE_TAG_FIXEDMEM32:
 376                         if (len != 9)
 377                                 goto len_err;
 378                         pnpbios_parse_fixed_mem32_option(dev, p, len, option);
 379                         break;
 380
 381                 case SMALL_TAG_IRQ:
 382                         if (len < 2 || len > 3)
 383                                 goto len_err;
 384                         pnpbios_parse_irq_option(dev, p, len, option);
 385                         break;
 386
 387                 case SMALL_TAG_DMA:
 388                         if (len != 2)
 389                                 goto len_err;
 390                         pnpbios_parse_dma_option(dev, p, len, option);
 391                         break;
 392
 393                 case SMALL_TAG_PORT:
 394                         if (len != 7)
 395                                 goto len_err;
 396                         pnpbios_parse_port_option(dev, p, len, option);
 397                         break;
 398
 399                 case SMALL_TAG_VENDOR:
 400                         /* do nothing */
 401                         break;
 402
 403                 case SMALL_TAG_FIXEDPORT:
 404                         if (len != 3)
 405                                 goto len_err;
 406                         pnpbios_parse_fixed_port_option(dev, p, len, option);
 407                         break;
 408
 409                 case SMALL_TAG_STARTDEP:
 410                         if (len > 1)
 411                                 goto len_err;
 412                         priority = 0x100 | PNP_RES_PRIORITY_ACCEPTABLE;
 413                         if (len > 0)
 414                                 priority = 0x100 | p[1];
 415                         option = pnp_register_dependent_option(dev, priority);
 416                         if (!option)
 417                                 return NULL;
 418                         break;
 419
 420                 case SMALL_TAG_ENDDEP:
 421                         if (len != 0)
 422                                 goto len_err;
 423                         if (option_independent == option)
 424                                 dev_warn(&dev->dev, "missing "
 425                                          "SMALL_TAG_STARTDEP tag\n");
 426                         option = option_independent;
 427                         dev_dbg(&dev->dev, "end dependent options\n");
 428                         break;
 429
 430                 case SMALL_TAG_END:
 431                         return p + 2;
 432
 433                 default:        /* an unkown tag */
 434 len_err:
 435                         dev_err(&dev->dev, "unknown tag %#x length %d\n",
 436                                 tag, len);
 437                         break;
 438                 }
 439
 440                 /* continue to the next tag */
 441                 if (p[0] & LARGE_TAG)
 442                         p += len + 3;
 443                 else
 444                         p += len + 1;
 445         }
 446
 447         dev_err(&dev->dev, "no end tag in resource structure\n");
 448
 449         return NULL;
 450 }
 451
 452 /*
 453  * Compatible Device IDs
 454  */
 455
 456 static unsigned char *pnpbios_parse_compatible_ids(unsigned char *p,
 457                                                    unsigned char *end,
 458                                                    struct pnp_dev *dev)
 459 {
 460         int len, tag;
 461         u32 eisa_id;
 462         char id[8];
 463         struct pnp_id *dev_id;
 464
 465         if (!p)
 466                 return NULL;
 467
 468         while ((char *)p < (char *)end) {
 469
 470                 /* determine the type of tag */
 471                 if (p[0] & LARGE_TAG) { /* large tag */
 472                         len = (p[2] << 8) | p[1];
 473                         tag = p[0];
 474                 } else {        /* small tag */
 475                         len = p[0] & 0x07;
 476                         tag = ((p[0] >> 3) & 0x0f);
 477                 }
 478
 479                 switch (tag) {
 480
 481                 case LARGE_TAG_ANSISTR:
 482                         strncpy(dev->name, p + 3,
 483                                 len >= PNP_NAME_LEN ? PNP_NAME_LEN - 2 : len);
 484                         dev->name[len >=
 485                                   PNP_NAME_LEN ? PNP_NAME_LEN - 1 : len] = '\0';
 486                         break;
 487
 488                 case SMALL_TAG_COMPATDEVID:     /* compatible ID */
 489                         if (len != 4)
 490                                 goto len_err;
 491                         eisa_id = p[1] | p[2] << 8 | p[3] << 16 | p[4] << 24;
 492                         pnp_eisa_id_to_string(eisa_id & PNP_EISA_ID_MASK, id);
 493                         dev_id = pnp_add_id(dev, id);
 494                         if (!dev_id)
 495                                 return NULL;
 496                         break;
 497
 498                 case SMALL_TAG_END:
 499                         p = p + 2;
 500                         return (unsigned char *)p;
 501                         break;
 502
 503                 default:        /* an unkown tag */
 504 len_err:
 505                         dev_err(&dev->dev, "unknown tag %#x length %d\n",
 506                                 tag, len);
 507                         break;
 508                 }
 509
 510                 /* continue to the next tag */
 511                 if (p[0] & LARGE_TAG)
 512                         p += len + 3;
 513                 else
 514                         p += len + 1;
 515         }
 516
 517         dev_err(&dev->dev, "no end tag in resource structure\n");
 518
 519         return NULL;
 520 }
 521
 522 /*
 523  * Allocated Resource Encoding
 524  */
 525
 526 static void pnpbios_encode_mem(struct pnp_dev *dev, unsigned char *p,
 527                                struct resource *res)
 528 {
 529         unsigned long base = res->start;
 530         unsigned long len = res->end - res->start + 1;
 531
 532         p[4] = (base >> 8) & 0xff;
 533         p[5] = ((base >> 8) >> 8) & 0xff;
 534         p[6] = (base >> 8) & 0xff;
 535         p[7] = ((base >> 8) >> 8) & 0xff;
 536         p[10] = (len >> 8) & 0xff;
 537         p[11] = ((len >> 8) >> 8) & 0xff;
 538
 539         dev_dbg(&dev->dev, "  encode mem %#llx-%#llx\n",
 540                 (unsigned long long) res->start, (unsigned long long) res->end);
 541 }
 542
 543 static void pnpbios_encode_mem32(struct pnp_dev *dev, unsigned char *p,
 544                                  struct resource *res)
 545 {
 546         unsigned long base = res->start;
 547         unsigned long len = res->end - res->start + 1;
 548
 549         p[4] = base & 0xff;
 550         p[5] = (base >> 8) & 0xff;
 551         p[6] = (base >> 16) & 0xff;
 552         p[7] = (base >> 24) & 0xff;
 553         p[8] = base & 0xff;
 554         p[9] = (base >> 8) & 0xff;
 555         p[10] = (base >> 16) & 0xff;
 556         p[11] = (base >> 24) & 0xff;
 557         p[16] = len & 0xff;
 558         p[17] = (len >> 8) & 0xff;
 559         p[18] = (len >> 16) & 0xff;
 560         p[19] = (len >> 24) & 0xff;
 561
 562         dev_dbg(&dev->dev, "  encode mem32 %#llx-%#llx\n",
 563                 (unsigned long long) res->start, (unsigned long long) res->end);
 564 }
 565
 566 static void pnpbios_encode_fixed_mem32(struct pnp_dev *dev, unsigned char *p,
 567                                        struct resource *res)
 568 {
 569         unsigned long base = res->start;
 570         unsigned long len = res->end - res->start + 1;
 571
 572         p[4] = base & 0xff;
 573         p[5] = (base >> 8) & 0xff;
 574         p[6] = (base >> 16) & 0xff;
 575         p[7] = (base >> 24) & 0xff;
 576         p[8] = len & 0xff;
 577         p[9] = (len >> 8) & 0xff;
 578         p[10] = (len >> 16) & 0xff;
 579         p[11] = (len >> 24) & 0xff;
 580
 581         dev_dbg(&dev->dev, "  encode fixed_mem32 %#llx-%#llx\n",
 582                 (unsigned long long) res->start, (unsigned long long) res->end);
 583 }
 584
 585 static void pnpbios_encode_irq(struct pnp_dev *dev, unsigned char *p,
 586                                struct resource *res)
 587 {
 588         unsigned long map = 0;
 589
 590         map = 1 << res->start;
 591         p[1] = map & 0xff;
 592         p[2] = (map >> 8) & 0xff;
 593
 594         dev_dbg(&dev->dev, "  encode irq %llu\n",
 595                 (unsigned long long)res->start);
 596 }
 597
 598 static void pnpbios_encode_dma(struct pnp_dev *dev, unsigned char *p,
 599                                struct resource *res)
 600 {
 601         unsigned long map = 0;
 602
 603         map = 1 << res->start;
 604         p[1] = map & 0xff;
 605
 606         dev_dbg(&dev->dev, "  encode dma %llu\n",
 607                 (unsigned long long)res->start);
 608 }
 609
 610 static void pnpbios_encode_port(struct pnp_dev *dev, unsigned char *p,
 611                                 struct resource *res)
 612 {
 613         unsigned long base = res->start;
 614         unsigned long len = res->end - res->start + 1;
 615
 616         p[2] = base & 0xff;
 617         p[3] = (base >> 8) & 0xff;
 618         p[4] = base & 0xff;
 619         p[5] = (base >> 8) & 0xff;
 620         p[7] = len & 0xff;
 621
 622         dev_dbg(&dev->dev, "  encode io %#llx-%#llx\n",
 623                 (unsigned long long) res->start, (unsigned long long) res->end);
 624 }
 625
 626 static void pnpbios_encode_fixed_port(struct pnp_dev *dev, unsigned char *p,
 627                                       struct resource *res)
 628 {
 629         unsigned long base = res->start;
 630         unsigned long len = res->end - res->start + 1;
 631
 632         p[1] = base & 0xff;
 633         p[2] = (base >> 8) & 0xff;
 634         p[3] = len & 0xff;
 635
 636         dev_dbg(&dev->dev, "  encode fixed_io %#llx-%#llx\n",
 637                 (unsigned long long) res->start, (unsigned long long) res->end);
 638 }
 639
 640 static unsigned char *pnpbios_encode_allocated_resource_data(struct pnp_dev
 641                                                                 *dev,
 642                                                              unsigned char *p,
 643                                                              unsigned char *end)
 644 {
 645         unsigned int len, tag;
 646         int port = 0, irq = 0, dma = 0, mem = 0;
 647
 648         if (!p)
 649                 return NULL;
 650
 651         while ((char *)p < (char *)end) {
 652
 653                 /* determine the type of tag */
 654                 if (p[0] & LARGE_TAG) { /* large tag */
 655                         len = (p[2] << 8) | p[1];
 656                         tag = p[0];
 657                 } else {        /* small tag */
 658                         len = p[0] & 0x07;
 659                         tag = ((p[0] >> 3) & 0x0f);
 660                 }
 661
 662                 switch (tag) {
 663
 664                 case LARGE_TAG_MEM:
 665                         if (len != 9)
 666                                 goto len_err;
 667                         pnpbios_encode_mem(dev, p,
 668                                 pnp_get_resource(dev, IORESOURCE_MEM, mem));
 669                         mem++;
 670                         break;
 671
 672                 case LARGE_TAG_MEM32:
 673                         if (len != 17)
 674                                 goto len_err;
 675                         pnpbios_encode_mem32(dev, p,
 676                                 pnp_get_resource(dev, IORESOURCE_MEM, mem));
 677                         mem++;
 678                         break;
 679
 680                 case LARGE_TAG_FIXEDMEM32:
 681                         if (len != 9)
 682                                 goto len_err;
 683                         pnpbios_encode_fixed_mem32(dev, p,
 684                                 pnp_get_resource(dev, IORESOURCE_MEM, mem));
 685                         mem++;
 686                         break;
 687
 688                 case SMALL_TAG_IRQ:
 689                         if (len < 2 || len > 3)
 690                                 goto len_err;
 691                         pnpbios_encode_irq(dev, p,
 692                                 pnp_get_resource(dev, IORESOURCE_IRQ, irq));
 693                         irq++;
 694                         break;
 695
 696                 case SMALL_TAG_DMA:
 697                         if (len != 2)
 698                                 goto len_err;
 699                         pnpbios_encode_dma(dev, p,
 700                                 pnp_get_resource(dev, IORESOURCE_DMA, dma));
 701                         dma++;
 702                         break;
 703
 704                 case SMALL_TAG_PORT:
 705                         if (len != 7)
 706                                 goto len_err;
 707                         pnpbios_encode_port(dev, p,
 708                                 pnp_get_resource(dev, IORESOURCE_IO, port));
 709                         port++;
 710                         break;
 711
 712                 case SMALL_TAG_VENDOR:
 713                         /* do nothing */
 714                         break;
 715
 716                 case SMALL_TAG_FIXEDPORT:
 717                         if (len != 3)
 718                                 goto len_err;
 719                         pnpbios_encode_fixed_port(dev, p,
 720                                 pnp_get_resource(dev, IORESOURCE_IO, port));
 721                         port++;
 722                         break;
 723
 724                 case SMALL_TAG_END:
 725                         p = p + 2;
 726                         return (unsigned char *)p;
 727                         break;
 728
 729                 default:        /* an unkown tag */
 730 len_err:
 731                         dev_err(&dev->dev, "unknown tag %#x length %d\n",
 732                                 tag, len);
 733                         break;
 734                 }
 735
 736                 /* continue to the next tag */
 737                 if (p[0] & LARGE_TAG)
 738                         p += len + 3;
 739                 else
 740                         p += len + 1;
 741         }
 742
 743         dev_err(&dev->dev, "no end tag in resource structure\n");
 744
 745         return NULL;
 746 }
 747
 748 /*
 749  * Core Parsing Functions
 750  */
 751
 752 int __init pnpbios_parse_data_stream(struct pnp_dev *dev,
 753                                         struct pnp_bios_node *node)
 754 {
 755         unsigned char *p = (char *)node->data;
 756         unsigned char *end = (char *)(node->data + node->size);
 757
 758         p = pnpbios_parse_allocated_resource_data(dev, p, end);
 759         if (!p)
 760                 return -EIO;
 761         p = pnpbios_parse_resource_option_data(p, end, dev);
 762         if (!p)
 763                 return -EIO;
 764         p = pnpbios_parse_compatible_ids(p, end, dev);
 765         if (!p)
 766                 return -EIO;
 767         return 0;
 768 }
 769
 770 int pnpbios_read_resources_from_node(struct pnp_dev *dev,
 771                                      struct pnp_bios_node *node)
 772 {
 773         unsigned char *p = (char *)node->data;
 774         unsigned char *end = (char *)(node->data + node->size);
 775
 776         p = pnpbios_parse_allocated_resource_data(dev, p, end);
 777         if (!p)
 778                 return -EIO;
 779         return 0;
 780 }
 781
 782 int pnpbios_write_resources_to_node(struct pnp_dev *dev,
 783                                     struct pnp_bios_node *node)
 784 {
 785         unsigned char *p = (char *)node->data;
 786         unsigned char *end = (char *)(node->data + node->size);
 787
 788         p = pnpbios_encode_allocated_resource_data(dev, p, end);
 789         if (!p)
 790                 return -EIO;
 791         return 0;
 792 }