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
9 #ifdef CONFIG_PCI
10 #include <linux/pci.h>
11 #else
pcibios_penalize_isa_irq(int irq,int active)12 inline void pcibios_penalize_isa_irq(int irq, int active)
13 {
14 }
15 #endif /* CONFIG_PCI */
16
17 #include "../base.h"
18 #include "pnpbios.h"
19
20 /* standard resource tags */
21 #define SMALL_TAG_PNPVERNO 0x01
22 #define SMALL_TAG_LOGDEVID 0x02
23 #define SMALL_TAG_COMPATDEVID 0x03
24 #define SMALL_TAG_IRQ 0x04
25 #define SMALL_TAG_DMA 0x05
26 #define SMALL_TAG_STARTDEP 0x06
27 #define SMALL_TAG_ENDDEP 0x07
28 #define SMALL_TAG_PORT 0x08
29 #define SMALL_TAG_FIXEDPORT 0x09
30 #define SMALL_TAG_VENDOR 0x0e
31 #define SMALL_TAG_END 0x0f
32 #define LARGE_TAG 0x80
33 #define LARGE_TAG_MEM 0x81
34 #define LARGE_TAG_ANSISTR 0x82
35 #define LARGE_TAG_UNICODESTR 0x83
36 #define LARGE_TAG_VENDOR 0x84
37 #define LARGE_TAG_MEM32 0x85
38 #define LARGE_TAG_FIXEDMEM32 0x86
39
40 /*
41 * Resource Data Stream Format:
42 *
43 * Allocated Resources (required)
44 * end tag ->
45 * Resource Configuration Options (optional)
46 * end tag ->
47 * Compitable Device IDs (optional)
48 * final end tag ->
49 */
50
51 /*
52 * Allocated Resources
53 */
54
pnpbios_parse_allocated_ioresource(struct pnp_dev * dev,int start,int len)55 static void pnpbios_parse_allocated_ioresource(struct pnp_dev *dev,
56 int start, int len)
57 {
58 int flags = 0;
59 int end = start + len - 1;
60
61 if (len <= 0 || end >= 0x10003)
62 flags |= IORESOURCE_DISABLED;
63
64 pnp_add_io_resource(dev, start, end, flags);
65 }
66
pnpbios_parse_allocated_memresource(struct pnp_dev * dev,int start,int len)67 static void pnpbios_parse_allocated_memresource(struct pnp_dev *dev,
68 int start, int len)
69 {
70 int flags = 0;
71 int end = start + len - 1;
72
73 if (len <= 0)
74 flags |= IORESOURCE_DISABLED;
75
76 pnp_add_mem_resource(dev, start, end, flags);
77 }
78
pnpbios_parse_allocated_resource_data(struct pnp_dev * dev,unsigned char * p,unsigned char * end)79 static unsigned char *pnpbios_parse_allocated_resource_data(struct pnp_dev *dev,
80 unsigned char *p,
81 unsigned char *end)
82 {
83 unsigned int len, tag;
84 int io, size, mask, i, flags;
85
86 if (!p)
87 return NULL;
88
89 pnp_dbg(&dev->dev, "parse allocated resources\n");
90
91 pnp_init_resources(dev);
92
93 while ((char *)p < (char *)end) {
94
95 /* determine the type of tag */
96 if (p[0] & LARGE_TAG) { /* large tag */
97 len = (p[2] << 8) | p[1];
98 tag = p[0];
99 } else { /* small tag */
100 len = p[0] & 0x07;
101 tag = ((p[0] >> 3) & 0x0f);
102 }
103
104 switch (tag) {
105
106 case LARGE_TAG_MEM:
107 if (len != 9)
108 goto len_err;
109 io = *(short *)&p[4];
110 size = *(short *)&p[10];
111 pnpbios_parse_allocated_memresource(dev, io, size);
112 break;
113
114 case LARGE_TAG_ANSISTR:
115 /* ignore this for now */
116 break;
117
118 case LARGE_TAG_VENDOR:
119 /* do nothing */
120 break;
121
122 case LARGE_TAG_MEM32:
123 if (len != 17)
124 goto len_err;
125 io = *(int *)&p[4];
126 size = *(int *)&p[16];
127 pnpbios_parse_allocated_memresource(dev, io, size);
128 break;
129
130 case LARGE_TAG_FIXEDMEM32:
131 if (len != 9)
132 goto len_err;
133 io = *(int *)&p[4];
134 size = *(int *)&p[8];
135 pnpbios_parse_allocated_memresource(dev, io, size);
136 break;
137
138 case SMALL_TAG_IRQ:
139 if (len < 2 || len > 3)
140 goto len_err;
141 flags = 0;
142 io = -1;
143 mask = p[1] + p[2] * 256;
144 for (i = 0; i < 16; i++, mask = mask >> 1)
145 if (mask & 0x01)
146 io = i;
147 if (io != -1)
148 pcibios_penalize_isa_irq(io, 1);
149 else
150 flags = IORESOURCE_DISABLED;
151 pnp_add_irq_resource(dev, io, flags);
152 break;
153
154 case SMALL_TAG_DMA:
155 if (len != 2)
156 goto len_err;
157 flags = 0;
158 io = -1;
159 mask = p[1];
160 for (i = 0; i < 8; i++, mask = mask >> 1)
161 if (mask & 0x01)
162 io = i;
163 if (io == -1)
164 flags = IORESOURCE_DISABLED;
165 pnp_add_dma_resource(dev, io, flags);
166 break;
167
168 case SMALL_TAG_PORT:
169 if (len != 7)
170 goto len_err;
171 io = p[2] + p[3] * 256;
172 size = p[7];
173 pnpbios_parse_allocated_ioresource(dev, io, size);
174 break;
175
176 case SMALL_TAG_VENDOR:
177 /* do nothing */
178 break;
179
180 case SMALL_TAG_FIXEDPORT:
181 if (len != 3)
182 goto len_err;
183 io = p[1] + p[2] * 256;
184 size = p[3];
185 pnpbios_parse_allocated_ioresource(dev, io, size);
186 break;
187
188 case SMALL_TAG_END:
189 p = p + 2;
190 return (unsigned char *)p;
191 break;
192
193 default: /* an unknown tag */
194 len_err:
195 dev_err(&dev->dev, "unknown tag %#x length %d\n",
196 tag, len);
197 break;
198 }
199
200 /* continue to the next tag */
201 if (p[0] & LARGE_TAG)
202 p += len + 3;
203 else
204 p += len + 1;
205 }
206
207 dev_err(&dev->dev, "no end tag in resource structure\n");
208
209 return NULL;
210 }
211
212 /*
213 * Resource Configuration Options
214 */
215
pnpbios_parse_mem_option(struct pnp_dev * dev,unsigned char * p,int size,unsigned int option_flags)216 static __init void pnpbios_parse_mem_option(struct pnp_dev *dev,
217 unsigned char *p, int size,
218 unsigned int option_flags)
219 {
220 resource_size_t min, max, align, len;
221 unsigned char flags;
222
223 min = ((p[5] << 8) | p[4]) << 8;
224 max = ((p[7] << 8) | p[6]) << 8;
225 align = (p[9] << 8) | p[8];
226 len = ((p[11] << 8) | p[10]) << 8;
227 flags = p[3];
228 pnp_register_mem_resource(dev, option_flags, min, max, align, len,
229 flags);
230 }
231
pnpbios_parse_mem32_option(struct pnp_dev * dev,unsigned char * p,int size,unsigned int option_flags)232 static __init void pnpbios_parse_mem32_option(struct pnp_dev *dev,
233 unsigned char *p, int size,
234 unsigned int option_flags)
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_flags, min, max, align, len,
245 flags);
246 }
247
pnpbios_parse_fixed_mem32_option(struct pnp_dev * dev,unsigned char * p,int size,unsigned int option_flags)248 static __init void pnpbios_parse_fixed_mem32_option(struct pnp_dev *dev,
249 unsigned char *p, int size,
250 unsigned int option_flags)
251 {
252 resource_size_t base, len;
253 unsigned char flags;
254
255 base = (p[7] << 24) | (p[6] << 16) | (p[5] << 8) | p[4];
256 len = (p[11] << 24) | (p[10] << 16) | (p[9] << 8) | p[8];
257 flags = p[3];
258 pnp_register_mem_resource(dev, option_flags, base, base, 0, len, flags);
259 }
260
pnpbios_parse_irq_option(struct pnp_dev * dev,unsigned char * p,int size,unsigned int option_flags)261 static __init void pnpbios_parse_irq_option(struct pnp_dev *dev,
262 unsigned char *p, int size,
263 unsigned int option_flags)
264 {
265 unsigned long bits;
266 pnp_irq_mask_t map;
267 unsigned char flags = IORESOURCE_IRQ_HIGHEDGE;
268
269 bits = (p[2] << 8) | p[1];
270
271 bitmap_zero(map.bits, PNP_IRQ_NR);
272 bitmap_copy(map.bits, &bits, 16);
273
274 if (size > 2)
275 flags = p[3];
276
277 pnp_register_irq_resource(dev, option_flags, &map, flags);
278 }
279
pnpbios_parse_dma_option(struct pnp_dev * dev,unsigned char * p,int size,unsigned int option_flags)280 static __init void pnpbios_parse_dma_option(struct pnp_dev *dev,
281 unsigned char *p, int size,
282 unsigned int option_flags)
283 {
284 pnp_register_dma_resource(dev, option_flags, p[1], p[2]);
285 }
286
pnpbios_parse_port_option(struct pnp_dev * dev,unsigned char * p,int size,unsigned int option_flags)287 static __init void pnpbios_parse_port_option(struct pnp_dev *dev,
288 unsigned char *p, int size,
289 unsigned int option_flags)
290 {
291 resource_size_t min, max, align, len;
292 unsigned char flags;
293
294 min = (p[3] << 8) | p[2];
295 max = (p[5] << 8) | p[4];
296 align = p[6];
297 len = p[7];
298 flags = p[1] ? IORESOURCE_IO_16BIT_ADDR : 0;
299 pnp_register_port_resource(dev, option_flags, min, max, align, len,
300 flags);
301 }
302
pnpbios_parse_fixed_port_option(struct pnp_dev * dev,unsigned char * p,int size,unsigned int option_flags)303 static __init void pnpbios_parse_fixed_port_option(struct pnp_dev *dev,
304 unsigned char *p, int size,
305 unsigned int option_flags)
306 {
307 resource_size_t base, len;
308
309 base = (p[2] << 8) | p[1];
310 len = p[3];
311 pnp_register_port_resource(dev, option_flags, base, base, 0, len,
312 IORESOURCE_IO_FIXED);
313 }
314
315 static __init unsigned char *
pnpbios_parse_resource_option_data(unsigned char * p,unsigned char * end,struct pnp_dev * dev)316 pnpbios_parse_resource_option_data(unsigned char *p, unsigned char *end,
317 struct pnp_dev *dev)
318 {
319 unsigned int len, tag;
320 int priority;
321 unsigned int option_flags;
322
323 if (!p)
324 return NULL;
325
326 pnp_dbg(&dev->dev, "parse resource options\n");
327 option_flags = 0;
328 while ((char *)p < (char *)end) {
329
330 /* determine the type of tag */
331 if (p[0] & LARGE_TAG) { /* large tag */
332 len = (p[2] << 8) | p[1];
333 tag = p[0];
334 } else { /* small tag */
335 len = p[0] & 0x07;
336 tag = ((p[0] >> 3) & 0x0f);
337 }
338
339 switch (tag) {
340
341 case LARGE_TAG_MEM:
342 if (len != 9)
343 goto len_err;
344 pnpbios_parse_mem_option(dev, p, len, option_flags);
345 break;
346
347 case LARGE_TAG_MEM32:
348 if (len != 17)
349 goto len_err;
350 pnpbios_parse_mem32_option(dev, p, len, option_flags);
351 break;
352
353 case LARGE_TAG_FIXEDMEM32:
354 if (len != 9)
355 goto len_err;
356 pnpbios_parse_fixed_mem32_option(dev, p, len,
357 option_flags);
358 break;
359
360 case SMALL_TAG_IRQ:
361 if (len < 2 || len > 3)
362 goto len_err;
363 pnpbios_parse_irq_option(dev, p, len, option_flags);
364 break;
365
366 case SMALL_TAG_DMA:
367 if (len != 2)
368 goto len_err;
369 pnpbios_parse_dma_option(dev, p, len, option_flags);
370 break;
371
372 case SMALL_TAG_PORT:
373 if (len != 7)
374 goto len_err;
375 pnpbios_parse_port_option(dev, p, len, option_flags);
376 break;
377
378 case SMALL_TAG_VENDOR:
379 /* do nothing */
380 break;
381
382 case SMALL_TAG_FIXEDPORT:
383 if (len != 3)
384 goto len_err;
385 pnpbios_parse_fixed_port_option(dev, p, len,
386 option_flags);
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_flags = pnp_new_dependent_set(dev, priority);
396 break;
397
398 case SMALL_TAG_ENDDEP:
399 if (len != 0)
400 goto len_err;
401 option_flags = 0;
402 break;
403
404 case SMALL_TAG_END:
405 return p + 2;
406
407 default: /* an unknown tag */
408 len_err:
409 dev_err(&dev->dev, "unknown tag %#x length %d\n",
410 tag, len);
411 break;
412 }
413
414 /* continue to the next tag */
415 if (p[0] & LARGE_TAG)
416 p += len + 3;
417 else
418 p += len + 1;
419 }
420
421 dev_err(&dev->dev, "no end tag in resource structure\n");
422
423 return NULL;
424 }
425
426 /*
427 * Compatible Device IDs
428 */
429
pnpbios_parse_compatible_ids(unsigned char * p,unsigned char * end,struct pnp_dev * dev)430 static unsigned char *pnpbios_parse_compatible_ids(unsigned char *p,
431 unsigned char *end,
432 struct pnp_dev *dev)
433 {
434 int len, tag;
435 u32 eisa_id;
436 char id[8];
437 struct pnp_id *dev_id;
438
439 if (!p)
440 return NULL;
441
442 while ((char *)p < (char *)end) {
443
444 /* determine the type of tag */
445 if (p[0] & LARGE_TAG) { /* large tag */
446 len = (p[2] << 8) | p[1];
447 tag = p[0];
448 } else { /* small tag */
449 len = p[0] & 0x07;
450 tag = ((p[0] >> 3) & 0x0f);
451 }
452
453 switch (tag) {
454
455 case LARGE_TAG_ANSISTR:
456 strncpy(dev->name, p + 3,
457 len >= PNP_NAME_LEN ? PNP_NAME_LEN - 2 : len);
458 dev->name[len >=
459 PNP_NAME_LEN ? PNP_NAME_LEN - 1 : len] = '\0';
460 break;
461
462 case SMALL_TAG_COMPATDEVID: /* compatible ID */
463 if (len != 4)
464 goto len_err;
465 eisa_id = p[1] | p[2] << 8 | p[3] << 16 | p[4] << 24;
466 pnp_eisa_id_to_string(eisa_id & PNP_EISA_ID_MASK, id);
467 dev_id = pnp_add_id(dev, id);
468 if (!dev_id)
469 return NULL;
470 break;
471
472 case SMALL_TAG_END:
473 p = p + 2;
474 return (unsigned char *)p;
475 break;
476
477 default: /* an unknown tag */
478 len_err:
479 dev_err(&dev->dev, "unknown tag %#x length %d\n",
480 tag, len);
481 break;
482 }
483
484 /* continue to the next tag */
485 if (p[0] & LARGE_TAG)
486 p += len + 3;
487 else
488 p += len + 1;
489 }
490
491 dev_err(&dev->dev, "no end tag in resource structure\n");
492
493 return NULL;
494 }
495
496 /*
497 * Allocated Resource Encoding
498 */
499
pnpbios_encode_mem(struct pnp_dev * dev,unsigned char * p,struct resource * res)500 static void pnpbios_encode_mem(struct pnp_dev *dev, unsigned char *p,
501 struct resource *res)
502 {
503 unsigned long base;
504 unsigned long len;
505
506 if (pnp_resource_enabled(res)) {
507 base = res->start;
508 len = res->end - res->start + 1;
509 } else {
510 base = 0;
511 len = 0;
512 }
513
514 p[4] = (base >> 8) & 0xff;
515 p[5] = ((base >> 8) >> 8) & 0xff;
516 p[6] = (base >> 8) & 0xff;
517 p[7] = ((base >> 8) >> 8) & 0xff;
518 p[10] = (len >> 8) & 0xff;
519 p[11] = ((len >> 8) >> 8) & 0xff;
520
521 pnp_dbg(&dev->dev, " encode mem %#lx-%#lx\n", base, base + len - 1);
522 }
523
pnpbios_encode_mem32(struct pnp_dev * dev,unsigned char * p,struct resource * res)524 static void pnpbios_encode_mem32(struct pnp_dev *dev, unsigned char *p,
525 struct resource *res)
526 {
527 unsigned long base;
528 unsigned long len;
529
530 if (pnp_resource_enabled(res)) {
531 base = res->start;
532 len = res->end - res->start + 1;
533 } else {
534 base = 0;
535 len = 0;
536 }
537
538 p[4] = base & 0xff;
539 p[5] = (base >> 8) & 0xff;
540 p[6] = (base >> 16) & 0xff;
541 p[7] = (base >> 24) & 0xff;
542 p[8] = base & 0xff;
543 p[9] = (base >> 8) & 0xff;
544 p[10] = (base >> 16) & 0xff;
545 p[11] = (base >> 24) & 0xff;
546 p[16] = len & 0xff;
547 p[17] = (len >> 8) & 0xff;
548 p[18] = (len >> 16) & 0xff;
549 p[19] = (len >> 24) & 0xff;
550
551 pnp_dbg(&dev->dev, " encode mem32 %#lx-%#lx\n", base, base + len - 1);
552 }
553
pnpbios_encode_fixed_mem32(struct pnp_dev * dev,unsigned char * p,struct resource * res)554 static void pnpbios_encode_fixed_mem32(struct pnp_dev *dev, unsigned char *p,
555 struct resource *res)
556 {
557 unsigned long base;
558 unsigned long len;
559
560 if (pnp_resource_enabled(res)) {
561 base = res->start;
562 len = res->end - res->start + 1;
563 } else {
564 base = 0;
565 len = 0;
566 }
567
568 p[4] = base & 0xff;
569 p[5] = (base >> 8) & 0xff;
570 p[6] = (base >> 16) & 0xff;
571 p[7] = (base >> 24) & 0xff;
572 p[8] = len & 0xff;
573 p[9] = (len >> 8) & 0xff;
574 p[10] = (len >> 16) & 0xff;
575 p[11] = (len >> 24) & 0xff;
576
577 pnp_dbg(&dev->dev, " encode fixed_mem32 %#lx-%#lx\n", base,
578 base + len - 1);
579 }
580
pnpbios_encode_irq(struct pnp_dev * dev,unsigned char * p,struct resource * res)581 static void pnpbios_encode_irq(struct pnp_dev *dev, unsigned char *p,
582 struct resource *res)
583 {
584 unsigned long map;
585
586 if (pnp_resource_enabled(res))
587 map = 1 << res->start;
588 else
589 map = 0;
590
591 p[1] = map & 0xff;
592 p[2] = (map >> 8) & 0xff;
593
594 pnp_dbg(&dev->dev, " encode irq mask %#lx\n", map);
595 }
596
pnpbios_encode_dma(struct pnp_dev * dev,unsigned char * p,struct resource * res)597 static void pnpbios_encode_dma(struct pnp_dev *dev, unsigned char *p,
598 struct resource *res)
599 {
600 unsigned long map;
601
602 if (pnp_resource_enabled(res))
603 map = 1 << res->start;
604 else
605 map = 0;
606
607 p[1] = map & 0xff;
608
609 pnp_dbg(&dev->dev, " encode dma mask %#lx\n", map);
610 }
611
pnpbios_encode_port(struct pnp_dev * dev,unsigned char * p,struct resource * res)612 static void pnpbios_encode_port(struct pnp_dev *dev, unsigned char *p,
613 struct resource *res)
614 {
615 unsigned long base;
616 unsigned long len;
617
618 if (pnp_resource_enabled(res)) {
619 base = res->start;
620 len = res->end - res->start + 1;
621 } else {
622 base = 0;
623 len = 0;
624 }
625
626 p[2] = base & 0xff;
627 p[3] = (base >> 8) & 0xff;
628 p[4] = base & 0xff;
629 p[5] = (base >> 8) & 0xff;
630 p[7] = len & 0xff;
631
632 pnp_dbg(&dev->dev, " encode io %#lx-%#lx\n", base, base + len - 1);
633 }
634
pnpbios_encode_fixed_port(struct pnp_dev * dev,unsigned char * p,struct resource * res)635 static void pnpbios_encode_fixed_port(struct pnp_dev *dev, unsigned char *p,
636 struct resource *res)
637 {
638 unsigned long base = res->start;
639 unsigned long len = res->end - res->start + 1;
640
641 if (pnp_resource_enabled(res)) {
642 base = res->start;
643 len = res->end - res->start + 1;
644 } else {
645 base = 0;
646 len = 0;
647 }
648
649 p[1] = base & 0xff;
650 p[2] = (base >> 8) & 0xff;
651 p[3] = len & 0xff;
652
653 pnp_dbg(&dev->dev, " encode fixed_io %#lx-%#lx\n", base,
654 base + len - 1);
655 }
656
pnpbios_encode_allocated_resource_data(struct pnp_dev * dev,unsigned char * p,unsigned char * end)657 static unsigned char *pnpbios_encode_allocated_resource_data(struct pnp_dev
658 *dev,
659 unsigned char *p,
660 unsigned char *end)
661 {
662 unsigned int len, tag;
663 int port = 0, irq = 0, dma = 0, mem = 0;
664
665 if (!p)
666 return NULL;
667
668 while ((char *)p < (char *)end) {
669
670 /* determine the type of tag */
671 if (p[0] & LARGE_TAG) { /* large tag */
672 len = (p[2] << 8) | p[1];
673 tag = p[0];
674 } else { /* small tag */
675 len = p[0] & 0x07;
676 tag = ((p[0] >> 3) & 0x0f);
677 }
678
679 switch (tag) {
680
681 case LARGE_TAG_MEM:
682 if (len != 9)
683 goto len_err;
684 pnpbios_encode_mem(dev, p,
685 pnp_get_resource(dev, IORESOURCE_MEM, mem));
686 mem++;
687 break;
688
689 case LARGE_TAG_MEM32:
690 if (len != 17)
691 goto len_err;
692 pnpbios_encode_mem32(dev, p,
693 pnp_get_resource(dev, IORESOURCE_MEM, mem));
694 mem++;
695 break;
696
697 case LARGE_TAG_FIXEDMEM32:
698 if (len != 9)
699 goto len_err;
700 pnpbios_encode_fixed_mem32(dev, p,
701 pnp_get_resource(dev, IORESOURCE_MEM, mem));
702 mem++;
703 break;
704
705 case SMALL_TAG_IRQ:
706 if (len < 2 || len > 3)
707 goto len_err;
708 pnpbios_encode_irq(dev, p,
709 pnp_get_resource(dev, IORESOURCE_IRQ, irq));
710 irq++;
711 break;
712
713 case SMALL_TAG_DMA:
714 if (len != 2)
715 goto len_err;
716 pnpbios_encode_dma(dev, p,
717 pnp_get_resource(dev, IORESOURCE_DMA, dma));
718 dma++;
719 break;
720
721 case SMALL_TAG_PORT:
722 if (len != 7)
723 goto len_err;
724 pnpbios_encode_port(dev, p,
725 pnp_get_resource(dev, IORESOURCE_IO, port));
726 port++;
727 break;
728
729 case SMALL_TAG_VENDOR:
730 /* do nothing */
731 break;
732
733 case SMALL_TAG_FIXEDPORT:
734 if (len != 3)
735 goto len_err;
736 pnpbios_encode_fixed_port(dev, p,
737 pnp_get_resource(dev, IORESOURCE_IO, port));
738 port++;
739 break;
740
741 case SMALL_TAG_END:
742 p = p + 2;
743 return (unsigned char *)p;
744 break;
745
746 default: /* an unknown tag */
747 len_err:
748 dev_err(&dev->dev, "unknown tag %#x length %d\n",
749 tag, len);
750 break;
751 }
752
753 /* continue to the next tag */
754 if (p[0] & LARGE_TAG)
755 p += len + 3;
756 else
757 p += len + 1;
758 }
759
760 dev_err(&dev->dev, "no end tag in resource structure\n");
761
762 return NULL;
763 }
764
765 /*
766 * Core Parsing Functions
767 */
768
pnpbios_parse_data_stream(struct pnp_dev * dev,struct pnp_bios_node * node)769 int __init pnpbios_parse_data_stream(struct pnp_dev *dev,
770 struct pnp_bios_node *node)
771 {
772 unsigned char *p = (char *)node->data;
773 unsigned char *end = (char *)(node->data + node->size);
774
775 p = pnpbios_parse_allocated_resource_data(dev, p, end);
776 if (!p)
777 return -EIO;
778 p = pnpbios_parse_resource_option_data(p, end, dev);
779 if (!p)
780 return -EIO;
781 p = pnpbios_parse_compatible_ids(p, end, dev);
782 if (!p)
783 return -EIO;
784 return 0;
785 }
786
pnpbios_read_resources_from_node(struct pnp_dev * dev,struct pnp_bios_node * node)787 int pnpbios_read_resources_from_node(struct pnp_dev *dev,
788 struct pnp_bios_node *node)
789 {
790 unsigned char *p = (char *)node->data;
791 unsigned char *end = (char *)(node->data + node->size);
792
793 p = pnpbios_parse_allocated_resource_data(dev, p, end);
794 if (!p)
795 return -EIO;
796 return 0;
797 }
798
pnpbios_write_resources_to_node(struct pnp_dev * dev,struct pnp_bios_node * node)799 int pnpbios_write_resources_to_node(struct pnp_dev *dev,
800 struct pnp_bios_node *node)
801 {
802 unsigned char *p = (char *)node->data;
803 unsigned char *end = (char *)(node->data + node->size);
804
805 p = pnpbios_encode_allocated_resource_data(dev, p, end);
806 if (!p)
807 return -EIO;
808 return 0;
809 }
810