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12#include <linux/kernel.h>
13#include <linux/initrd.h>
14#include <linux/module.h>
15#include <linux/of.h>
16#include <linux/of_fdt.h>
17#include <linux/string.h>
18#include <linux/errno.h>
19#include <linux/slab.h>
20
21#include <asm/setup.h>
22#ifdef CONFIG_PPC
23#include <asm/machdep.h>
24#endif
25
26#include <asm/page.h>
27
28char *of_fdt_get_string(struct boot_param_header *blob, u32 offset)
29{
30 return ((char *)blob) +
31 be32_to_cpu(blob->off_dt_strings) + offset;
32}
33
34
35
36
37
38void *of_fdt_get_property(struct boot_param_header *blob,
39 unsigned long node, const char *name,
40 unsigned long *size)
41{
42 unsigned long p = node;
43
44 do {
45 u32 tag = be32_to_cpup((__be32 *)p);
46 u32 sz, noff;
47 const char *nstr;
48
49 p += 4;
50 if (tag == OF_DT_NOP)
51 continue;
52 if (tag != OF_DT_PROP)
53 return NULL;
54
55 sz = be32_to_cpup((__be32 *)p);
56 noff = be32_to_cpup((__be32 *)(p + 4));
57 p += 8;
58 if (be32_to_cpu(blob->version) < 0x10)
59 p = ALIGN(p, sz >= 8 ? 8 : 4);
60
61 nstr = of_fdt_get_string(blob, noff);
62 if (nstr == NULL) {
63 pr_warning("Can't find property index name !\n");
64 return NULL;
65 }
66 if (strcmp(name, nstr) == 0) {
67 if (size)
68 *size = sz;
69 return (void *)p;
70 }
71 p += sz;
72 p = ALIGN(p, 4);
73 } while (1);
74}
75
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83
84
85
86int of_fdt_is_compatible(struct boot_param_header *blob,
87 unsigned long node, const char *compat)
88{
89 const char *cp;
90 unsigned long cplen, l, score = 0;
91
92 cp = of_fdt_get_property(blob, node, "compatible", &cplen);
93 if (cp == NULL)
94 return 0;
95 while (cplen > 0) {
96 score++;
97 if (of_compat_cmp(cp, compat, strlen(compat)) == 0)
98 return score;
99 l = strlen(cp) + 1;
100 cp += l;
101 cplen -= l;
102 }
103
104 return 0;
105}
106
107
108
109
110int of_fdt_match(struct boot_param_header *blob, unsigned long node,
111 const char *const *compat)
112{
113 unsigned int tmp, score = 0;
114
115 if (!compat)
116 return 0;
117
118 while (*compat) {
119 tmp = of_fdt_is_compatible(blob, node, *compat);
120 if (tmp && (score == 0 || (tmp < score)))
121 score = tmp;
122 compat++;
123 }
124
125 return score;
126}
127
128static void *unflatten_dt_alloc(unsigned long *mem, unsigned long size,
129 unsigned long align)
130{
131 void *res;
132
133 *mem = ALIGN(*mem, align);
134 res = (void *)*mem;
135 *mem += size;
136
137 return res;
138}
139
140
141
142
143
144
145
146
147
148
149static unsigned long unflatten_dt_node(struct boot_param_header *blob,
150 unsigned long mem,
151 unsigned long *p,
152 struct device_node *dad,
153 struct device_node ***allnextpp,
154 unsigned long fpsize)
155{
156 struct device_node *np;
157 struct property *pp, **prev_pp = NULL;
158 char *pathp;
159 u32 tag;
160 unsigned int l, allocl;
161 int has_name = 0;
162 int new_format = 0;
163
164 tag = be32_to_cpup((__be32 *)(*p));
165 if (tag != OF_DT_BEGIN_NODE) {
166 pr_err("Weird tag at start of node: %x\n", tag);
167 return mem;
168 }
169 *p += 4;
170 pathp = (char *)*p;
171 l = allocl = strlen(pathp) + 1;
172 *p = ALIGN(*p + l, 4);
173
174
175
176
177
178
179 if ((*pathp) != '/') {
180 new_format = 1;
181 if (fpsize == 0) {
182
183
184
185
186
187 fpsize = 1;
188 allocl = 2;
189 l = 1;
190 *pathp = '\0';
191 } else {
192
193
194
195 fpsize += l;
196 allocl = fpsize;
197 }
198 }
199
200 np = unflatten_dt_alloc(&mem, sizeof(struct device_node) + allocl,
201 __alignof__(struct device_node));
202 if (allnextpp) {
203 char *fn;
204 memset(np, 0, sizeof(*np));
205 np->full_name = fn = ((char *)np) + sizeof(*np);
206 if (new_format) {
207
208 if (dad && dad->parent) {
209 strcpy(fn, dad->full_name);
210#ifdef DEBUG
211 if ((strlen(fn) + l + 1) != allocl) {
212 pr_debug("%s: p: %d, l: %d, a: %d\n",
213 pathp, (int)strlen(fn),
214 l, allocl);
215 }
216#endif
217 fn += strlen(fn);
218 }
219 *(fn++) = '/';
220 }
221 memcpy(fn, pathp, l);
222
223 prev_pp = &np->properties;
224 **allnextpp = np;
225 *allnextpp = &np->allnext;
226 if (dad != NULL) {
227 np->parent = dad;
228
229 if (dad->next == NULL)
230 dad->child = np;
231 else
232 dad->next->sibling = np;
233 dad->next = np;
234 }
235 kref_init(&np->kref);
236 }
237
238 while (1) {
239 u32 sz, noff;
240 char *pname;
241
242 tag = be32_to_cpup((__be32 *)(*p));
243 if (tag == OF_DT_NOP) {
244 *p += 4;
245 continue;
246 }
247 if (tag != OF_DT_PROP)
248 break;
249 *p += 4;
250 sz = be32_to_cpup((__be32 *)(*p));
251 noff = be32_to_cpup((__be32 *)((*p) + 4));
252 *p += 8;
253 if (be32_to_cpu(blob->version) < 0x10)
254 *p = ALIGN(*p, sz >= 8 ? 8 : 4);
255
256 pname = of_fdt_get_string(blob, noff);
257 if (pname == NULL) {
258 pr_info("Can't find property name in list !\n");
259 break;
260 }
261 if (strcmp(pname, "name") == 0)
262 has_name = 1;
263 l = strlen(pname) + 1;
264 pp = unflatten_dt_alloc(&mem, sizeof(struct property),
265 __alignof__(struct property));
266 if (allnextpp) {
267
268
269
270
271
272 if ((strcmp(pname, "phandle") == 0) ||
273 (strcmp(pname, "linux,phandle") == 0)) {
274 if (np->phandle == 0)
275 np->phandle = be32_to_cpup((__be32*)*p);
276 }
277
278
279
280 if (strcmp(pname, "ibm,phandle") == 0)
281 np->phandle = be32_to_cpup((__be32 *)*p);
282 pp->name = pname;
283 pp->length = sz;
284 pp->value = (void *)*p;
285 *prev_pp = pp;
286 prev_pp = &pp->next;
287 }
288 *p = ALIGN((*p) + sz, 4);
289 }
290
291
292
293 if (!has_name) {
294 char *p1 = pathp, *ps = pathp, *pa = NULL;
295 int sz;
296
297 while (*p1) {
298 if ((*p1) == '@')
299 pa = p1;
300 if ((*p1) == '/')
301 ps = p1 + 1;
302 p1++;
303 }
304 if (pa < ps)
305 pa = p1;
306 sz = (pa - ps) + 1;
307 pp = unflatten_dt_alloc(&mem, sizeof(struct property) + sz,
308 __alignof__(struct property));
309 if (allnextpp) {
310 pp->name = "name";
311 pp->length = sz;
312 pp->value = pp + 1;
313 *prev_pp = pp;
314 prev_pp = &pp->next;
315 memcpy(pp->value, ps, sz - 1);
316 ((char *)pp->value)[sz - 1] = 0;
317 pr_debug("fixed up name for %s -> %s\n", pathp,
318 (char *)pp->value);
319 }
320 }
321 if (allnextpp) {
322 *prev_pp = NULL;
323 np->name = of_get_property(np, "name", NULL);
324 np->type = of_get_property(np, "device_type", NULL);
325
326 if (!np->name)
327 np->name = "<NULL>";
328 if (!np->type)
329 np->type = "<NULL>";
330 }
331 while (tag == OF_DT_BEGIN_NODE || tag == OF_DT_NOP) {
332 if (tag == OF_DT_NOP)
333 *p += 4;
334 else
335 mem = unflatten_dt_node(blob, mem, p, np, allnextpp,
336 fpsize);
337 tag = be32_to_cpup((__be32 *)(*p));
338 }
339 if (tag != OF_DT_END_NODE) {
340 pr_err("Weird tag at end of node: %x\n", tag);
341 return mem;
342 }
343 *p += 4;
344 return mem;
345}
346
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357
358
359static void __unflatten_device_tree(struct boot_param_header *blob,
360 struct device_node **mynodes,
361 void * (*dt_alloc)(u64 size, u64 align))
362{
363 unsigned long start, mem, size;
364 struct device_node **allnextp = mynodes;
365
366 pr_debug(" -> unflatten_device_tree()\n");
367
368 if (!blob) {
369 pr_debug("No device tree pointer\n");
370 return;
371 }
372
373 pr_debug("Unflattening device tree:\n");
374 pr_debug("magic: %08x\n", be32_to_cpu(blob->magic));
375 pr_debug("size: %08x\n", be32_to_cpu(blob->totalsize));
376 pr_debug("version: %08x\n", be32_to_cpu(blob->version));
377
378 if (be32_to_cpu(blob->magic) != OF_DT_HEADER) {
379 pr_err("Invalid device tree blob header\n");
380 return;
381 }
382
383
384 start = ((unsigned long)blob) +
385 be32_to_cpu(blob->off_dt_struct);
386 size = unflatten_dt_node(blob, 0, &start, NULL, NULL, 0);
387 size = (size | 3) + 1;
388
389 pr_debug(" size is %lx, allocating...\n", size);
390
391
392 mem = (unsigned long)
393 dt_alloc(size + 4, __alignof__(struct device_node));
394
395 memset((void *)mem, 0, size);
396
397 ((__be32 *)mem)[size / 4] = cpu_to_be32(0xdeadbeef);
398
399 pr_debug(" unflattening %lx...\n", mem);
400
401
402 start = ((unsigned long)blob) +
403 be32_to_cpu(blob->off_dt_struct);
404 unflatten_dt_node(blob, mem, &start, NULL, &allnextp, 0);
405 if (be32_to_cpup((__be32 *)start) != OF_DT_END)
406 pr_warning("Weird tag at end of tree: %08x\n", *((u32 *)start));
407 if (be32_to_cpu(((__be32 *)mem)[size / 4]) != 0xdeadbeef)
408 pr_warning("End of tree marker overwritten: %08x\n",
409 be32_to_cpu(((__be32 *)mem)[size / 4]));
410 *allnextp = NULL;
411
412 pr_debug(" <- unflatten_device_tree()\n");
413}
414
415static void *kernel_tree_alloc(u64 size, u64 align)
416{
417 return kzalloc(size, GFP_KERNEL);
418}
419
420
421
422
423
424
425
426
427
428void of_fdt_unflatten_tree(unsigned long *blob,
429 struct device_node **mynodes)
430{
431 struct boot_param_header *device_tree =
432 (struct boot_param_header *)blob;
433 __unflatten_device_tree(device_tree, mynodes, &kernel_tree_alloc);
434}
435EXPORT_SYMBOL_GPL(of_fdt_unflatten_tree);
436
437
438int __initdata dt_root_addr_cells;
439int __initdata dt_root_size_cells;
440
441struct boot_param_header *initial_boot_params;
442
443#ifdef CONFIG_OF_EARLY_FLATTREE
444
445
446
447
448
449
450
451
452
453
454int __init of_scan_flat_dt(int (*it)(unsigned long node,
455 const char *uname, int depth,
456 void *data),
457 void *data)
458{
459 unsigned long p = ((unsigned long)initial_boot_params) +
460 be32_to_cpu(initial_boot_params->off_dt_struct);
461 int rc = 0;
462 int depth = -1;
463
464 do {
465 u32 tag = be32_to_cpup((__be32 *)p);
466 const char *pathp;
467
468 p += 4;
469 if (tag == OF_DT_END_NODE) {
470 depth--;
471 continue;
472 }
473 if (tag == OF_DT_NOP)
474 continue;
475 if (tag == OF_DT_END)
476 break;
477 if (tag == OF_DT_PROP) {
478 u32 sz = be32_to_cpup((__be32 *)p);
479 p += 8;
480 if (be32_to_cpu(initial_boot_params->version) < 0x10)
481 p = ALIGN(p, sz >= 8 ? 8 : 4);
482 p += sz;
483 p = ALIGN(p, 4);
484 continue;
485 }
486 if (tag != OF_DT_BEGIN_NODE) {
487 pr_err("Invalid tag %x in flat device tree!\n", tag);
488 return -EINVAL;
489 }
490 depth++;
491 pathp = (char *)p;
492 p = ALIGN(p + strlen(pathp) + 1, 4);
493 if (*pathp == '/')
494 pathp = kbasename(pathp);
495 rc = it(p, pathp, depth, data);
496 if (rc != 0)
497 break;
498 } while (1);
499
500 return rc;
501}
502
503
504
505
506unsigned long __init of_get_flat_dt_root(void)
507{
508 unsigned long p = ((unsigned long)initial_boot_params) +
509 be32_to_cpu(initial_boot_params->off_dt_struct);
510
511 while (be32_to_cpup((__be32 *)p) == OF_DT_NOP)
512 p += 4;
513 BUG_ON(be32_to_cpup((__be32 *)p) != OF_DT_BEGIN_NODE);
514 p += 4;
515 return ALIGN(p + strlen((char *)p) + 1, 4);
516}
517
518
519
520
521
522
523
524void *__init of_get_flat_dt_prop(unsigned long node, const char *name,
525 unsigned long *size)
526{
527 return of_fdt_get_property(initial_boot_params, node, name, size);
528}
529
530
531
532
533
534
535int __init of_flat_dt_is_compatible(unsigned long node, const char *compat)
536{
537 return of_fdt_is_compatible(initial_boot_params, node, compat);
538}
539
540
541
542
543int __init of_flat_dt_match(unsigned long node, const char *const *compat)
544{
545 return of_fdt_match(initial_boot_params, node, compat);
546}
547
548#ifdef CONFIG_BLK_DEV_INITRD
549
550
551
552
553void __init early_init_dt_check_for_initrd(unsigned long node)
554{
555 unsigned long start, end, len;
556 __be32 *prop;
557
558 pr_debug("Looking for initrd properties... ");
559
560 prop = of_get_flat_dt_prop(node, "linux,initrd-start", &len);
561 if (!prop)
562 return;
563 start = of_read_ulong(prop, len/4);
564
565 prop = of_get_flat_dt_prop(node, "linux,initrd-end", &len);
566 if (!prop)
567 return;
568 end = of_read_ulong(prop, len/4);
569
570 early_init_dt_setup_initrd_arch(start, end);
571 pr_debug("initrd_start=0x%lx initrd_end=0x%lx\n", start, end);
572}
573#else
574inline void early_init_dt_check_for_initrd(unsigned long node)
575{
576}
577#endif
578
579
580
581
582int __init early_init_dt_scan_root(unsigned long node, const char *uname,
583 int depth, void *data)
584{
585 __be32 *prop;
586
587 if (depth != 0)
588 return 0;
589
590 dt_root_size_cells = OF_ROOT_NODE_SIZE_CELLS_DEFAULT;
591 dt_root_addr_cells = OF_ROOT_NODE_ADDR_CELLS_DEFAULT;
592
593 prop = of_get_flat_dt_prop(node, "#size-cells", NULL);
594 if (prop)
595 dt_root_size_cells = be32_to_cpup(prop);
596 pr_debug("dt_root_size_cells = %x\n", dt_root_size_cells);
597
598 prop = of_get_flat_dt_prop(node, "#address-cells", NULL);
599 if (prop)
600 dt_root_addr_cells = be32_to_cpup(prop);
601 pr_debug("dt_root_addr_cells = %x\n", dt_root_addr_cells);
602
603
604 return 1;
605}
606
607u64 __init dt_mem_next_cell(int s, __be32 **cellp)
608{
609 __be32 *p = *cellp;
610
611 *cellp = p + s;
612 return of_read_number(p, s);
613}
614
615
616
617
618int __init early_init_dt_scan_memory(unsigned long node, const char *uname,
619 int depth, void *data)
620{
621 char *type = of_get_flat_dt_prop(node, "device_type", NULL);
622 __be32 *reg, *endp;
623 unsigned long l;
624
625
626 if (type == NULL) {
627
628
629
630
631 if (depth != 1 || strcmp(uname, "memory@0") != 0)
632 return 0;
633 } else if (strcmp(type, "memory") != 0)
634 return 0;
635
636 reg = of_get_flat_dt_prop(node, "linux,usable-memory", &l);
637 if (reg == NULL)
638 reg = of_get_flat_dt_prop(node, "reg", &l);
639 if (reg == NULL)
640 return 0;
641
642 endp = reg + (l / sizeof(__be32));
643
644 pr_debug("memory scan node %s, reg size %ld, data: %x %x %x %x,\n",
645 uname, l, reg[0], reg[1], reg[2], reg[3]);
646
647 while ((endp - reg) >= (dt_root_addr_cells + dt_root_size_cells)) {
648 u64 base, size;
649
650 base = dt_mem_next_cell(dt_root_addr_cells, ®);
651 size = dt_mem_next_cell(dt_root_size_cells, ®);
652
653 if (size == 0)
654 continue;
655 pr_debug(" - %llx , %llx\n", (unsigned long long)base,
656 (unsigned long long)size);
657
658 early_init_dt_add_memory_arch(base, size);
659 }
660
661 return 0;
662}
663
664int __init early_init_dt_scan_chosen(unsigned long node, const char *uname,
665 int depth, void *data)
666{
667 unsigned long l;
668 char *p;
669
670 pr_debug("search \"chosen\", depth: %d, uname: %s\n", depth, uname);
671
672 if (depth != 1 || !data ||
673 (strcmp(uname, "chosen") != 0 && strcmp(uname, "chosen@0") != 0))
674 return 0;
675
676 early_init_dt_check_for_initrd(node);
677
678
679 p = of_get_flat_dt_prop(node, "bootargs", &l);
680 if (p != NULL && l > 0)
681 strlcpy(data, p, min((int)l, COMMAND_LINE_SIZE));
682
683
684
685
686
687
688#ifdef CONFIG_CMDLINE
689#ifndef CONFIG_CMDLINE_FORCE
690 if (!((char *)data)[0])
691#endif
692 strlcpy(data, CONFIG_CMDLINE, COMMAND_LINE_SIZE);
693#endif
694
695 pr_debug("Command line is: %s\n", (char*)data);
696
697
698 return 1;
699}
700
701
702
703
704
705
706
707
708
709void __init unflatten_device_tree(void)
710{
711 __unflatten_device_tree(initial_boot_params, &of_allnodes,
712 early_init_dt_alloc_memory_arch);
713
714
715 of_alias_scan(early_init_dt_alloc_memory_arch);
716}
717
718#endif
719