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         resource_size_t min, max, align, len;
 222         unsigned char flags;
 223
 224         min = ((p[5] << 8) | p[4]) << 8;
 225         max = ((p[7] << 8) | p[6]) << 8;
 226         align = (p[9] << 8) | p[8];
 227         len = ((p[11] << 8) | p[10]) << 8;
 228         flags = p[3];
 229         pnp_register_mem_resource(dev, option, min, max, align, len, flags);
 230 }
 231
 232 static __init void pnpbios_parse_mem32_option(struct pnp_dev *dev,
 233                                               unsigned char *p, int size,
 234                                               struct pnp_option *option)
 235 {
 236         resource_size_t min, max, align, len;
 237         unsigned char flags;
 238
 239         min = (p[7] << 24) | (p[6] << 16) | (p[5] << 8) | p[4];
 240         max = (p[11] << 24) | (p[10] << 16) | (p[9] << 8) | p[8];
 241         align = (p[15] << 24) | (p[14] << 16) | (p[13] << 8) | p[12];
 242         len = (p[19] << 24) | (p[18] << 16) | (p[17] << 8) | p[16];
 243         flags = p[3];
 244         pnp_register_mem_resource(dev, option, min, max, align, len, flags);
 245 }
 246
 247 static __init void pnpbios_parse_fixed_mem32_option(struct pnp_dev *dev,
 248                                                     unsigned char *p, int size,
 249                                                     struct pnp_option *option)
 250 {
 251         resource_size_t base, len;
 252         unsigned char flags;
 253
 254         base = (p[7] << 24) | (p[6] << 16) | (p[5] << 8) | p[4];
 255         len = (p[11] << 24) | (p[10] << 16) | (p[9] << 8) | p[8];
 256         flags = p[3];
 257         pnp_register_mem_resource(dev, option, base, base, 0, len, flags);
 258 }
 259
 260 static __init void pnpbios_parse_irq_option(struct pnp_dev *dev,
 261                                             unsigned char *p, int size,
 262                                             struct pnp_option *option)
 263 {
 264         unsigned long bits;
 265         pnp_irq_mask_t map;
 266         unsigned char flags = IORESOURCE_IRQ_HIGHEDGE;
 267
 268         bits = (p[2] << 8) | p[1];
 269
 270         bitmap_zero(map.bits, PNP_IRQ_NR);
 271         bitmap_copy(map.bits, &bits, 16);
 272
 273         if (size > 2)
 274                 flags = p[3];
 275
 276         pnp_register_irq_resource(dev, option, &map, flags);
 277 }
 278
 279 static __init void pnpbios_parse_dma_option(struct pnp_dev *dev,
 280                                             unsigned char *p, int size,
 281                                             struct pnp_option *option)
 282 {
 283         pnp_register_dma_resource(dev, option, p[1], p[2]);
 284 }
 285
 286 static __init void pnpbios_parse_port_option(struct pnp_dev *dev,
 287                                              unsigned char *p, int size,
 288                                              struct pnp_option *option)
 289 {
 290         resource_size_t min, max, align, len;
 291         unsigned char flags;
 292
 293         min = (p[3] << 8) | p[2];
 294         max = (p[5] << 8) | p[4];
 295         align = p[6];
 296         len = p[7];
 297         flags = p[1] ? IORESOURCE_IO_16BIT_ADDR : 0;
 298         pnp_register_port_resource(dev, option, min, max, align, len, flags);
 299 }
 300
 301 static __init void pnpbios_parse_fixed_port_option(struct pnp_dev *dev,
 302                                                    unsigned char *p, int size,
 303                                                    struct pnp_option *option)
 304 {
 305         resource_size_t base, len;
 306
 307         base = (p[2] << 8) | p[1];
 308         len = p[3];
 309         pnp_register_port_resource(dev, option, base, base, 0, len,
 310                                    IORESOURCE_IO_FIXED);
 311 }
 312
 313 static __init unsigned char *
 314 pnpbios_parse_resource_option_data(unsigned char *p, unsigned char *end,
 315                                         struct pnp_dev *dev)
 316 {
 317         unsigned int len, tag;
 318         int priority;
 319         struct pnp_option *option, *option_independent;
 320
 321         if (!p)
 322                 return NULL;
 323
 324         dev_dbg(&dev->dev, "parse resource options\n");
 325
 326         option_independent = option = pnp_register_independent_option(dev);
 327         if (!option)
 328                 return NULL;
 329
 330         while ((char *)p < (char *)end) {
 331
 332                 /* determine the type of tag */
 333                 if (p[0] & LARGE_TAG) { /* large tag */
 334                         len = (p[2] << 8) | p[1];
 335                         tag = p[0];
 336                 } else {        /* small tag */
 337                         len = p[0] & 0x07;
 338                         tag = ((p[0] >> 3) & 0x0f);
 339                 }
 340
 341                 switch (tag) {
 342
 343                 case LARGE_TAG_MEM:
 344                         if (len != 9)
 345                                 goto len_err;
 346                         pnpbios_parse_mem_option(dev, p, len, option);
 347                         break;
 348
 349                 case LARGE_TAG_MEM32:
 350                         if (len != 17)
 351                                 goto len_err;
 352                         pnpbios_parse_mem32_option(dev, p, len, option);
 353                         break;
 354
 355                 case LARGE_TAG_FIXEDMEM32:
 356                         if (len != 9)
 357                                 goto len_err;
 358                         pnpbios_parse_fixed_mem32_option(dev, p, len, option);
 359                         break;
 360
 361                 case SMALL_TAG_IRQ:
 362                         if (len < 2 || len > 3)
 363                                 goto len_err;
 364                         pnpbios_parse_irq_option(dev, p, len, option);
 365                         break;
 366
 367                 case SMALL_TAG_DMA:
 368                         if (len != 2)
 369                                 goto len_err;
 370                         pnpbios_parse_dma_option(dev, p, len, option);
 371                         break;
 372
 373                 case SMALL_TAG_PORT:
 374                         if (len != 7)
 375                                 goto len_err;
 376                         pnpbios_parse_port_option(dev, p, len, option);
 377                         break;
 378
 379                 case SMALL_TAG_VENDOR:
 380                         /* do nothing */
 381                         break;
 382
 383                 case SMALL_TAG_FIXEDPORT:
 384                         if (len != 3)
 385                                 goto len_err;
 386                         pnpbios_parse_fixed_port_option(dev, p, len, option);
 387                         break;
 388
 389                 case SMALL_TAG_STARTDEP:
 390                         if (len > 1)
 391                                 goto len_err;
 392                         priority = PNP_RES_PRIORITY_ACCEPTABLE;
 393                         if (len > 0)
 394                                 priority = p[1];
 395                         option = pnp_register_dependent_option(dev, priority);
 396                         if (!option)
 397                                 return NULL;
 398                         break;
 399
 400                 case SMALL_TAG_ENDDEP:
 401                         if (len != 0)
 402                                 goto len_err;
 403                         if (option_independent == option)
 404                                 dev_warn(&dev->dev, "missing "
 405                                          "SMALL_TAG_STARTDEP tag\n");
 406                         option = option_independent;
 407                         dev_dbg(&dev->dev, "end dependent options\n");
 408                         break;
 409
 410                 case SMALL_TAG_END:
 411                         return p + 2;
 412
 413                 default:        /* an unkown tag */
 414 len_err:
 415                         dev_err(&dev->dev, "unknown tag %#x length %d\n",
 416                                 tag, len);
 417                         break;
 418                 }
 419
 420                 /* continue to the next tag */
 421                 if (p[0] & LARGE_TAG)
 422                         p += len + 3;
 423                 else
 424                         p += len + 1;
 425         }
 426
 427         dev_err(&dev->dev, "no end tag in resource structure\n");
 428
 429         return NULL;
 430 }
 431
 432 /*
 433  * Compatible Device IDs
 434  */
 435
 436 static unsigned char *pnpbios_parse_compatible_ids(unsigned char *p,
 437                                                    unsigned char *end,
 438                                                    struct pnp_dev *dev)
 439 {
 440         int len, tag;
 441         u32 eisa_id;
 442         char id[8];
 443         struct pnp_id *dev_id;
 444
 445         if (!p)
 446                 return NULL;
 447
 448         while ((char *)p < (char *)end) {
 449
 450                 /* determine the type of tag */
 451                 if (p[0] & LARGE_TAG) { /* large tag */
 452                         len = (p[2] << 8) | p[1];
 453                         tag = p[0];
 454                 } else {        /* small tag */
 455                         len = p[0] & 0x07;
 456                         tag = ((p[0] >> 3) & 0x0f);
 457                 }
 458
 459                 switch (tag) {
 460
 461                 case LARGE_TAG_ANSISTR:
 462                         strncpy(dev->name, p + 3,
 463                                 len >= PNP_NAME_LEN ? PNP_NAME_LEN - 2 : len);
 464                         dev->name[len >=
 465                                   PNP_NAME_LEN ? PNP_NAME_LEN - 1 : len] = '\0';
 466                         break;
 467
 468                 case SMALL_TAG_COMPATDEVID:     /* compatible ID */
 469                         if (len != 4)
 470                                 goto len_err;
 471                         eisa_id = p[1] | p[2] << 8 | p[3] << 16 | p[4] << 24;
 472                         pnp_eisa_id_to_string(eisa_id & PNP_EISA_ID_MASK, id);
 473                         dev_id = pnp_add_id(dev, id);
 474                         if (!dev_id)
 475                                 return NULL;
 476                         break;
 477
 478                 case SMALL_TAG_END:
 479                         p = p + 2;
 480                         return (unsigned char *)p;
 481                         break;
 482
 483                 default:        /* an unkown tag */
 484 len_err:
 485                         dev_err(&dev->dev, "unknown tag %#x length %d\n",
 486                                 tag, len);
 487                         break;
 488                 }
 489
 490                 /* continue to the next tag */
 491                 if (p[0] & LARGE_TAG)
 492                         p += len + 3;
 493                 else
 494                         p += len + 1;
 495         }
 496
 497         dev_err(&dev->dev, "no end tag in resource structure\n");
 498
 499         return NULL;
 500 }
 501
 502 /*
 503  * Allocated Resource Encoding
 504  */
 505
 506 static void pnpbios_encode_mem(struct pnp_dev *dev, unsigned char *p,
 507                                struct resource *res)
 508 {
 509         unsigned long base;
 510         unsigned long len;
 511
 512         if (pnp_resource_enabled(res)) {
 513                 base = res->start;
 514                 len = res->end - res->start + 1;
 515         } else {
 516                 base = 0;
 517                 len = 0;
 518         }
 519
 520         p[4] = (base >> 8) & 0xff;
 521         p[5] = ((base >> 8) >> 8) & 0xff;
 522         p[6] = (base >> 8) & 0xff;
 523         p[7] = ((base >> 8) >> 8) & 0xff;
 524         p[10] = (len >> 8) & 0xff;
 525         p[11] = ((len >> 8) >> 8) & 0xff;
 526
 527         dev_dbg(&dev->dev, "  encode mem %#lx-%#lx\n", base, base + len - 1);
 528 }
 529
 530 static void pnpbios_encode_mem32(struct pnp_dev *dev, unsigned char *p,
 531                                  struct resource *res)
 532 {
 533         unsigned long base;
 534         unsigned long len;
 535
 536         if (pnp_resource_enabled(res)) {
 537                 base = res->start;
 538                 len = res->end - res->start + 1;
 539         } else {
 540                 base = 0;
 541                 len = 0;
 542         }
 543
 544         p[4] = base & 0xff;
 545         p[5] = (base >> 8) & 0xff;
 546         p[6] = (base >> 16) & 0xff;
 547         p[7] = (base >> 24) & 0xff;
 548         p[8] = base & 0xff;
 549         p[9] = (base >> 8) & 0xff;
 550         p[10] = (base >> 16) & 0xff;
 551         p[11] = (base >> 24) & 0xff;
 552         p[16] = len & 0xff;
 553         p[17] = (len >> 8) & 0xff;
 554         p[18] = (len >> 16) & 0xff;
 555         p[19] = (len >> 24) & 0xff;
 556
 557         dev_dbg(&dev->dev, "  encode mem32 %#lx-%#lx\n", base, base + len - 1);
 558 }
 559
 560 static void pnpbios_encode_fixed_mem32(struct pnp_dev *dev, unsigned char *p,
 561                                        struct resource *res)
 562 {
 563         unsigned long base;
 564         unsigned long len;
 565
 566         if (pnp_resource_enabled(res)) {
 567                 base = res->start;
 568                 len = res->end - res->start + 1;
 569         } else {
 570                 base = 0;
 571                 len = 0;
 572         }
 573
 574         p[4] = base & 0xff;
 575         p[5] = (base >> 8) & 0xff;
 576         p[6] = (base >> 16) & 0xff;
 577         p[7] = (base >> 24) & 0xff;
 578         p[8] = len & 0xff;
 579         p[9] = (len >> 8) & 0xff;
 580         p[10] = (len >> 16) & 0xff;
 581         p[11] = (len >> 24) & 0xff;
 582
 583         dev_dbg(&dev->dev, "  encode fixed_mem32 %#lx-%#lx\n", base,
 584                 base + len - 1);
 585 }
 586
 587 static void pnpbios_encode_irq(struct pnp_dev *dev, unsigned char *p,
 588                                struct resource *res)
 589 {
 590         unsigned long map;
 591
 592         if (pnp_resource_enabled(res))
 593                 map = 1 << res->start;
 594         else
 595                 map = 0;
 596
 597         p[1] = map & 0xff;
 598         p[2] = (map >> 8) & 0xff;
 599
 600         dev_dbg(&dev->dev, "  encode irq mask %#lx\n", map);
 601 }
 602
 603 static void pnpbios_encode_dma(struct pnp_dev *dev, unsigned char *p,
 604                                struct resource *res)
 605 {
 606         unsigned long map;
 607
 608         if (pnp_resource_enabled(res))
 609                 map = 1 << res->start;
 610         else
 611                 map = 0;
 612
 613         p[1] = map & 0xff;
 614
 615         dev_dbg(&dev->dev, "  encode dma mask %#lx\n", map);
 616 }
 617
 618 static void pnpbios_encode_port(struct pnp_dev *dev, unsigned char *p,
 619                                 struct resource *res)
 620 {
 621         unsigned long base;
 622         unsigned long len;
 623
 624         if (pnp_resource_enabled(res)) {
 625                 base = res->start;
 626                 len = res->end - res->start + 1;
 627         } else {
 628                 base = 0;
 629                 len = 0;
 630         }
 631
 632         p[2] = base & 0xff;
 633         p[3] = (base >> 8) & 0xff;
 634         p[4] = base & 0xff;
 635         p[5] = (base >> 8) & 0xff;
 636         p[7] = len & 0xff;
 637
 638         dev_dbg(&dev->dev, "  encode io %#lx-%#lx\n", base, base + len - 1);
 639 }
 640
 641 static void pnpbios_encode_fixed_port(struct pnp_dev *dev, unsigned char *p,
 642                                       struct resource *res)
 643 {
 644         unsigned long base = res->start;
 645         unsigned long len = res->end - res->start + 1;
 646
 647         if (pnp_resource_enabled(res)) {
 648                 base = res->start;
 649                 len = res->end - res->start + 1;
 650         } else {
 651                 base = 0;
 652                 len = 0;
 653         }
 654
 655         p[1] = base & 0xff;
 656         p[2] = (base >> 8) & 0xff;
 657         p[3] = len & 0xff;
 658
 659         dev_dbg(&dev->dev, "  encode fixed_io %#lx-%#lx\n", base,
 660                 base + len - 1);
 661 }
 662
 663 static unsigned char *pnpbios_encode_allocated_resource_data(struct pnp_dev
 664                                                                 *dev,
 665                                                              unsigned char *p,
 666                                                              unsigned char *end)
 667 {
 668         unsigned int len, tag;
 669         int port = 0, irq = 0, dma = 0, mem = 0;
 670
 671         if (!p)
 672                 return NULL;
 673
 674         while ((char *)p < (char *)end) {
 675
 676                 /* determine the type of tag */
 677                 if (p[0] & LARGE_TAG) { /* large tag */
 678                         len = (p[2] << 8) | p[1];
 679                         tag = p[0];
 680                 } else {        /* small tag */
 681                         len = p[0] & 0x07;
 682                         tag = ((p[0] >> 3) & 0x0f);
 683                 }
 684
 685                 switch (tag) {
 686
 687                 case LARGE_TAG_MEM:
 688                         if (len != 9)
 689                                 goto len_err;
 690                         pnpbios_encode_mem(dev, p,
 691                                 pnp_get_resource(dev, IORESOURCE_MEM, mem));
 692                         mem++;
 693                         break;
 694
 695                 case LARGE_TAG_MEM32:
 696                         if (len != 17)
 697                                 goto len_err;
 698                         pnpbios_encode_mem32(dev, p,
 699                                 pnp_get_resource(dev, IORESOURCE_MEM, mem));
 700                         mem++;
 701                         break;
 702
 703                 case LARGE_TAG_FIXEDMEM32:
 704                         if (len != 9)
 705                                 goto len_err;
 706                         pnpbios_encode_fixed_mem32(dev, p,
 707                                 pnp_get_resource(dev, IORESOURCE_MEM, mem));
 708                         mem++;
 709                         break;
 710
 711                 case SMALL_TAG_IRQ:
 712                         if (len < 2 || len > 3)
 713                                 goto len_err;
 714                         pnpbios_encode_irq(dev, p,
 715                                 pnp_get_resource(dev, IORESOURCE_IRQ, irq));
 716                         irq++;
 717                         break;
 718
 719                 case SMALL_TAG_DMA:
 720                         if (len != 2)
 721                                 goto len_err;
 722                         pnpbios_encode_dma(dev, p,
 723                                 pnp_get_resource(dev, IORESOURCE_DMA, dma));
 724                         dma++;
 725                         break;
 726
 727                 case SMALL_TAG_PORT:
 728                         if (len != 7)
 729                                 goto len_err;
 730                         pnpbios_encode_port(dev, p,
 731                                 pnp_get_resource(dev, IORESOURCE_IO, port));
 732                         port++;
 733                         break;
 734
 735                 case SMALL_TAG_VENDOR:
 736                         /* do nothing */
 737                         break;
 738
 739                 case SMALL_TAG_FIXEDPORT:
 740                         if (len != 3)
 741                                 goto len_err;
 742                         pnpbios_encode_fixed_port(dev, p,
 743                                 pnp_get_resource(dev, IORESOURCE_IO, port));
 744                         port++;
 745                         break;
 746
 747                 case SMALL_TAG_END:
 748                         p = p + 2;
 749                         return (unsigned char *)p;
 750                         break;
 751
 752                 default:        /* an unkown tag */
 753 len_err:
 754                         dev_err(&dev->dev, "unknown tag %#x length %d\n",
 755                                 tag, len);
 756                         break;
 757                 }
 758
 759                 /* continue to the next tag */
 760                 if (p[0] & LARGE_TAG)
 761                         p += len + 3;
 762                 else
 763                         p += len + 1;
 764         }
 765
 766         dev_err(&dev->dev, "no end tag in resource structure\n");
 767
 768         return NULL;
 769 }
 770
 771 /*
 772  * Core Parsing Functions
 773  */
 774
 775 int __init pnpbios_parse_data_stream(struct pnp_dev *dev,
 776                                         struct pnp_bios_node *node)
 777 {
 778         unsigned char *p = (char *)node->data;
 779         unsigned char *end = (char *)(node->data + node->size);
 780
 781         p = pnpbios_parse_allocated_resource_data(dev, p, end);
 782         if (!p)
 783                 return -EIO;
 784         p = pnpbios_parse_resource_option_data(p, end, dev);
 785         if (!p)
 786                 return -EIO;
 787         p = pnpbios_parse_compatible_ids(p, end, dev);
 788         if (!p)
 789                 return -EIO;
 790         return 0;
 791 }
 792
 793 int pnpbios_read_resources_from_node(struct pnp_dev *dev,
 794                                      struct pnp_bios_node *node)
 795 {
 796         unsigned char *p = (char *)node->data;
 797         unsigned char *end = (char *)(node->data + node->size);
 798
 799         p = pnpbios_parse_allocated_resource_data(dev, p, end);
 800         if (!p)
 801                 return -EIO;
 802         return 0;
 803 }
 804
 805 int pnpbios_write_resources_to_node(struct pnp_dev *dev,
 806                                     struct pnp_bios_node *node)
 807 {
 808         unsigned char *p = (char *)node->data;
 809         unsigned char *end = (char *)(node->data + node->size);
 810
 811         p = pnpbios_encode_allocated_resource_data(dev, p, end);
 812         if (!p)
 813                 return -EIO;
 814         return 0;
 815 }