Commit | Line | Data |
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e169cfbe GL |
1 | /* |
2 | * Functions for working with the Flattened Device Tree data format | |
3 | * | |
4 | * Copyright 2009 Benjamin Herrenschmidt, IBM Corp | |
5 | * benh@kernel.crashing.org | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or | |
8 | * modify it under the terms of the GNU General Public License | |
9 | * version 2 as published by the Free Software Foundation. | |
10 | */ | |
11 | ||
41f88009 | 12 | #include <linux/kernel.h> |
f7b3a835 | 13 | #include <linux/initrd.h> |
e169cfbe GL |
14 | #include <linux/of.h> |
15 | #include <linux/of_fdt.h> | |
4ef7b373 JK |
16 | #include <linux/string.h> |
17 | #include <linux/errno.h> | |
51975db0 | 18 | |
86e03221 GL |
19 | #ifdef CONFIG_PPC |
20 | #include <asm/machdep.h> | |
21 | #endif /* CONFIG_PPC */ | |
22 | ||
4ef7b373 JK |
23 | #include <asm/page.h> |
24 | ||
f00abd94 GL |
25 | int __initdata dt_root_addr_cells; |
26 | int __initdata dt_root_size_cells; | |
27 | ||
e169cfbe GL |
28 | struct boot_param_header *initial_boot_params; |
29 | ||
e6ce1324 SN |
30 | #ifdef CONFIG_OF_EARLY_FLATTREE |
31 | ||
e169cfbe GL |
32 | char *find_flat_dt_string(u32 offset) |
33 | { | |
34 | return ((char *)initial_boot_params) + | |
087f79c4 | 35 | be32_to_cpu(initial_boot_params->off_dt_strings) + offset; |
e169cfbe | 36 | } |
c8cb7a59 GL |
37 | |
38 | /** | |
39 | * of_scan_flat_dt - scan flattened tree blob and call callback on each. | |
40 | * @it: callback function | |
41 | * @data: context data pointer | |
42 | * | |
43 | * This function is used to scan the flattened device-tree, it is | |
44 | * used to extract the memory information at boot before we can | |
45 | * unflatten the tree | |
46 | */ | |
47 | int __init of_scan_flat_dt(int (*it)(unsigned long node, | |
48 | const char *uname, int depth, | |
49 | void *data), | |
50 | void *data) | |
51 | { | |
52 | unsigned long p = ((unsigned long)initial_boot_params) + | |
087f79c4 | 53 | be32_to_cpu(initial_boot_params->off_dt_struct); |
c8cb7a59 GL |
54 | int rc = 0; |
55 | int depth = -1; | |
56 | ||
57 | do { | |
33714881 | 58 | u32 tag = be32_to_cpup((__be32 *)p); |
c8cb7a59 GL |
59 | char *pathp; |
60 | ||
61 | p += 4; | |
62 | if (tag == OF_DT_END_NODE) { | |
63 | depth--; | |
64 | continue; | |
65 | } | |
66 | if (tag == OF_DT_NOP) | |
67 | continue; | |
68 | if (tag == OF_DT_END) | |
69 | break; | |
70 | if (tag == OF_DT_PROP) { | |
33714881 | 71 | u32 sz = be32_to_cpup((__be32 *)p); |
c8cb7a59 | 72 | p += 8; |
087f79c4 | 73 | if (be32_to_cpu(initial_boot_params->version) < 0x10) |
f1d4c3a7 | 74 | p = ALIGN(p, sz >= 8 ? 8 : 4); |
c8cb7a59 | 75 | p += sz; |
f1d4c3a7 | 76 | p = ALIGN(p, 4); |
c8cb7a59 GL |
77 | continue; |
78 | } | |
79 | if (tag != OF_DT_BEGIN_NODE) { | |
80 | pr_err("Invalid tag %x in flat device tree!\n", tag); | |
81 | return -EINVAL; | |
82 | } | |
83 | depth++; | |
84 | pathp = (char *)p; | |
f1d4c3a7 | 85 | p = ALIGN(p + strlen(pathp) + 1, 4); |
c8cb7a59 GL |
86 | if ((*pathp) == '/') { |
87 | char *lp, *np; | |
88 | for (lp = NULL, np = pathp; *np; np++) | |
89 | if ((*np) == '/') | |
90 | lp = np+1; | |
91 | if (lp != NULL) | |
92 | pathp = lp; | |
93 | } | |
94 | rc = it(p, pathp, depth, data); | |
95 | if (rc != 0) | |
96 | break; | |
97 | } while (1); | |
98 | ||
99 | return rc; | |
100 | } | |
819d2819 GL |
101 | |
102 | /** | |
103 | * of_get_flat_dt_root - find the root node in the flat blob | |
104 | */ | |
105 | unsigned long __init of_get_flat_dt_root(void) | |
106 | { | |
107 | unsigned long p = ((unsigned long)initial_boot_params) + | |
087f79c4 | 108 | be32_to_cpu(initial_boot_params->off_dt_struct); |
819d2819 | 109 | |
33714881 | 110 | while (be32_to_cpup((__be32 *)p) == OF_DT_NOP) |
819d2819 | 111 | p += 4; |
33714881 | 112 | BUG_ON(be32_to_cpup((__be32 *)p) != OF_DT_BEGIN_NODE); |
819d2819 | 113 | p += 4; |
f1d4c3a7 | 114 | return ALIGN(p + strlen((char *)p) + 1, 4); |
819d2819 GL |
115 | } |
116 | ||
ca900cfa GL |
117 | /** |
118 | * of_get_flat_dt_prop - Given a node in the flat blob, return the property ptr | |
119 | * | |
120 | * This function can be used within scan_flattened_dt callback to get | |
121 | * access to properties | |
122 | */ | |
123 | void *__init of_get_flat_dt_prop(unsigned long node, const char *name, | |
124 | unsigned long *size) | |
125 | { | |
126 | unsigned long p = node; | |
127 | ||
128 | do { | |
33714881 | 129 | u32 tag = be32_to_cpup((__be32 *)p); |
ca900cfa GL |
130 | u32 sz, noff; |
131 | const char *nstr; | |
132 | ||
133 | p += 4; | |
134 | if (tag == OF_DT_NOP) | |
135 | continue; | |
136 | if (tag != OF_DT_PROP) | |
137 | return NULL; | |
138 | ||
33714881 JK |
139 | sz = be32_to_cpup((__be32 *)p); |
140 | noff = be32_to_cpup((__be32 *)(p + 4)); | |
ca900cfa | 141 | p += 8; |
087f79c4 | 142 | if (be32_to_cpu(initial_boot_params->version) < 0x10) |
f1d4c3a7 | 143 | p = ALIGN(p, sz >= 8 ? 8 : 4); |
ca900cfa GL |
144 | |
145 | nstr = find_flat_dt_string(noff); | |
146 | if (nstr == NULL) { | |
147 | pr_warning("Can't find property index name !\n"); | |
148 | return NULL; | |
149 | } | |
150 | if (strcmp(name, nstr) == 0) { | |
151 | if (size) | |
152 | *size = sz; | |
153 | return (void *)p; | |
154 | } | |
155 | p += sz; | |
f1d4c3a7 | 156 | p = ALIGN(p, 4); |
ca900cfa GL |
157 | } while (1); |
158 | } | |
159 | ||
00e38efd GL |
160 | /** |
161 | * of_flat_dt_is_compatible - Return true if given node has compat in compatible list | |
162 | * @node: node to test | |
163 | * @compat: compatible string to compare with compatible list. | |
164 | */ | |
165 | int __init of_flat_dt_is_compatible(unsigned long node, const char *compat) | |
166 | { | |
167 | const char *cp; | |
168 | unsigned long cplen, l; | |
169 | ||
170 | cp = of_get_flat_dt_prop(node, "compatible", &cplen); | |
171 | if (cp == NULL) | |
172 | return 0; | |
173 | while (cplen > 0) { | |
883c2cfc | 174 | if (of_compat_cmp(cp, compat, strlen(compat)) == 0) |
00e38efd GL |
175 | return 1; |
176 | l = strlen(cp) + 1; | |
177 | cp += l; | |
178 | cplen -= l; | |
179 | } | |
180 | ||
181 | return 0; | |
182 | } | |
183 | ||
bbd33931 GL |
184 | static void *__init unflatten_dt_alloc(unsigned long *mem, unsigned long size, |
185 | unsigned long align) | |
186 | { | |
187 | void *res; | |
188 | ||
f1d4c3a7 | 189 | *mem = ALIGN(*mem, align); |
bbd33931 GL |
190 | res = (void *)*mem; |
191 | *mem += size; | |
192 | ||
193 | return res; | |
194 | } | |
195 | ||
196 | /** | |
197 | * unflatten_dt_node - Alloc and populate a device_node from the flat tree | |
198 | * @p: pointer to node in flat tree | |
199 | * @dad: Parent struct device_node | |
200 | * @allnextpp: pointer to ->allnext from last allocated device_node | |
201 | * @fpsize: Size of the node path up at the current depth. | |
202 | */ | |
203 | unsigned long __init unflatten_dt_node(unsigned long mem, | |
204 | unsigned long *p, | |
205 | struct device_node *dad, | |
206 | struct device_node ***allnextpp, | |
207 | unsigned long fpsize) | |
208 | { | |
209 | struct device_node *np; | |
210 | struct property *pp, **prev_pp = NULL; | |
211 | char *pathp; | |
212 | u32 tag; | |
213 | unsigned int l, allocl; | |
214 | int has_name = 0; | |
215 | int new_format = 0; | |
216 | ||
33714881 | 217 | tag = be32_to_cpup((__be32 *)(*p)); |
bbd33931 GL |
218 | if (tag != OF_DT_BEGIN_NODE) { |
219 | pr_err("Weird tag at start of node: %x\n", tag); | |
220 | return mem; | |
221 | } | |
222 | *p += 4; | |
223 | pathp = (char *)*p; | |
224 | l = allocl = strlen(pathp) + 1; | |
f1d4c3a7 | 225 | *p = ALIGN(*p + l, 4); |
bbd33931 GL |
226 | |
227 | /* version 0x10 has a more compact unit name here instead of the full | |
228 | * path. we accumulate the full path size using "fpsize", we'll rebuild | |
229 | * it later. We detect this because the first character of the name is | |
230 | * not '/'. | |
231 | */ | |
232 | if ((*pathp) != '/') { | |
233 | new_format = 1; | |
234 | if (fpsize == 0) { | |
235 | /* root node: special case. fpsize accounts for path | |
236 | * plus terminating zero. root node only has '/', so | |
237 | * fpsize should be 2, but we want to avoid the first | |
238 | * level nodes to have two '/' so we use fpsize 1 here | |
239 | */ | |
240 | fpsize = 1; | |
241 | allocl = 2; | |
242 | } else { | |
243 | /* account for '/' and path size minus terminal 0 | |
244 | * already in 'l' | |
245 | */ | |
246 | fpsize += l; | |
247 | allocl = fpsize; | |
248 | } | |
249 | } | |
250 | ||
251 | np = unflatten_dt_alloc(&mem, sizeof(struct device_node) + allocl, | |
252 | __alignof__(struct device_node)); | |
253 | if (allnextpp) { | |
254 | memset(np, 0, sizeof(*np)); | |
255 | np->full_name = ((char *)np) + sizeof(struct device_node); | |
256 | if (new_format) { | |
257 | char *fn = np->full_name; | |
258 | /* rebuild full path for new format */ | |
259 | if (dad && dad->parent) { | |
260 | strcpy(fn, dad->full_name); | |
261 | #ifdef DEBUG | |
262 | if ((strlen(fn) + l + 1) != allocl) { | |
263 | pr_debug("%s: p: %d, l: %d, a: %d\n", | |
264 | pathp, (int)strlen(fn), | |
265 | l, allocl); | |
266 | } | |
267 | #endif | |
268 | fn += strlen(fn); | |
269 | } | |
270 | *(fn++) = '/'; | |
271 | memcpy(fn, pathp, l); | |
272 | } else | |
273 | memcpy(np->full_name, pathp, l); | |
274 | prev_pp = &np->properties; | |
275 | **allnextpp = np; | |
276 | *allnextpp = &np->allnext; | |
277 | if (dad != NULL) { | |
278 | np->parent = dad; | |
279 | /* we temporarily use the next field as `last_child'*/ | |
280 | if (dad->next == NULL) | |
281 | dad->child = np; | |
282 | else | |
283 | dad->next->sibling = np; | |
284 | dad->next = np; | |
285 | } | |
286 | kref_init(&np->kref); | |
287 | } | |
288 | while (1) { | |
289 | u32 sz, noff; | |
290 | char *pname; | |
291 | ||
33714881 | 292 | tag = be32_to_cpup((__be32 *)(*p)); |
bbd33931 GL |
293 | if (tag == OF_DT_NOP) { |
294 | *p += 4; | |
295 | continue; | |
296 | } | |
297 | if (tag != OF_DT_PROP) | |
298 | break; | |
299 | *p += 4; | |
33714881 JK |
300 | sz = be32_to_cpup((__be32 *)(*p)); |
301 | noff = be32_to_cpup((__be32 *)((*p) + 4)); | |
bbd33931 | 302 | *p += 8; |
087f79c4 | 303 | if (be32_to_cpu(initial_boot_params->version) < 0x10) |
f1d4c3a7 | 304 | *p = ALIGN(*p, sz >= 8 ? 8 : 4); |
bbd33931 GL |
305 | |
306 | pname = find_flat_dt_string(noff); | |
307 | if (pname == NULL) { | |
308 | pr_info("Can't find property name in list !\n"); | |
309 | break; | |
310 | } | |
311 | if (strcmp(pname, "name") == 0) | |
312 | has_name = 1; | |
313 | l = strlen(pname) + 1; | |
314 | pp = unflatten_dt_alloc(&mem, sizeof(struct property), | |
315 | __alignof__(struct property)); | |
316 | if (allnextpp) { | |
04b954a6 DG |
317 | /* We accept flattened tree phandles either in |
318 | * ePAPR-style "phandle" properties, or the | |
319 | * legacy "linux,phandle" properties. If both | |
320 | * appear and have different values, things | |
321 | * will get weird. Don't do that. */ | |
322 | if ((strcmp(pname, "phandle") == 0) || | |
323 | (strcmp(pname, "linux,phandle") == 0)) { | |
6016a363 | 324 | if (np->phandle == 0) |
9a6b2e58 | 325 | np->phandle = be32_to_cpup((__be32*)*p); |
bbd33931 | 326 | } |
04b954a6 DG |
327 | /* And we process the "ibm,phandle" property |
328 | * used in pSeries dynamic device tree | |
329 | * stuff */ | |
bbd33931 | 330 | if (strcmp(pname, "ibm,phandle") == 0) |
9a6b2e58 | 331 | np->phandle = be32_to_cpup((__be32 *)*p); |
bbd33931 GL |
332 | pp->name = pname; |
333 | pp->length = sz; | |
334 | pp->value = (void *)*p; | |
335 | *prev_pp = pp; | |
336 | prev_pp = &pp->next; | |
337 | } | |
f1d4c3a7 | 338 | *p = ALIGN((*p) + sz, 4); |
bbd33931 GL |
339 | } |
340 | /* with version 0x10 we may not have the name property, recreate | |
341 | * it here from the unit name if absent | |
342 | */ | |
343 | if (!has_name) { | |
344 | char *p1 = pathp, *ps = pathp, *pa = NULL; | |
345 | int sz; | |
346 | ||
347 | while (*p1) { | |
348 | if ((*p1) == '@') | |
349 | pa = p1; | |
350 | if ((*p1) == '/') | |
351 | ps = p1 + 1; | |
352 | p1++; | |
353 | } | |
354 | if (pa < ps) | |
355 | pa = p1; | |
356 | sz = (pa - ps) + 1; | |
357 | pp = unflatten_dt_alloc(&mem, sizeof(struct property) + sz, | |
358 | __alignof__(struct property)); | |
359 | if (allnextpp) { | |
360 | pp->name = "name"; | |
361 | pp->length = sz; | |
362 | pp->value = pp + 1; | |
363 | *prev_pp = pp; | |
364 | prev_pp = &pp->next; | |
365 | memcpy(pp->value, ps, sz - 1); | |
366 | ((char *)pp->value)[sz - 1] = 0; | |
367 | pr_debug("fixed up name for %s -> %s\n", pathp, | |
368 | (char *)pp->value); | |
369 | } | |
370 | } | |
371 | if (allnextpp) { | |
372 | *prev_pp = NULL; | |
373 | np->name = of_get_property(np, "name", NULL); | |
374 | np->type = of_get_property(np, "device_type", NULL); | |
375 | ||
376 | if (!np->name) | |
377 | np->name = "<NULL>"; | |
378 | if (!np->type) | |
379 | np->type = "<NULL>"; | |
380 | } | |
7f809e1f JG |
381 | while (tag == OF_DT_BEGIN_NODE || tag == OF_DT_NOP) { |
382 | if (tag == OF_DT_NOP) | |
383 | *p += 4; | |
384 | else | |
385 | mem = unflatten_dt_node(mem, p, np, allnextpp, fpsize); | |
33714881 | 386 | tag = be32_to_cpup((__be32 *)(*p)); |
bbd33931 GL |
387 | } |
388 | if (tag != OF_DT_END_NODE) { | |
389 | pr_err("Weird tag at end of node: %x\n", tag); | |
390 | return mem; | |
391 | } | |
392 | *p += 4; | |
393 | return mem; | |
394 | } | |
41f88009 | 395 | |
f7b3a835 GL |
396 | #ifdef CONFIG_BLK_DEV_INITRD |
397 | /** | |
398 | * early_init_dt_check_for_initrd - Decode initrd location from flat tree | |
399 | * @node: reference to node containing initrd location ('chosen') | |
400 | */ | |
401 | void __init early_init_dt_check_for_initrd(unsigned long node) | |
402 | { | |
1406bc2f | 403 | unsigned long start, end, len; |
33714881 | 404 | __be32 *prop; |
f7b3a835 GL |
405 | |
406 | pr_debug("Looking for initrd properties... "); | |
407 | ||
408 | prop = of_get_flat_dt_prop(node, "linux,initrd-start", &len); | |
1406bc2f JK |
409 | if (!prop) |
410 | return; | |
411 | start = of_read_ulong(prop, len/4); | |
412 | ||
413 | prop = of_get_flat_dt_prop(node, "linux,initrd-end", &len); | |
414 | if (!prop) | |
415 | return; | |
416 | end = of_read_ulong(prop, len/4); | |
f7b3a835 | 417 | |
1406bc2f JK |
418 | early_init_dt_setup_initrd_arch(start, end); |
419 | pr_debug("initrd_start=0x%lx initrd_end=0x%lx\n", start, end); | |
f7b3a835 GL |
420 | } |
421 | #else | |
422 | inline void early_init_dt_check_for_initrd(unsigned long node) | |
423 | { | |
424 | } | |
425 | #endif /* CONFIG_BLK_DEV_INITRD */ | |
426 | ||
f00abd94 GL |
427 | /** |
428 | * early_init_dt_scan_root - fetch the top level address and size cells | |
429 | */ | |
430 | int __init early_init_dt_scan_root(unsigned long node, const char *uname, | |
431 | int depth, void *data) | |
432 | { | |
33714881 | 433 | __be32 *prop; |
f00abd94 GL |
434 | |
435 | if (depth != 0) | |
436 | return 0; | |
437 | ||
33714881 JK |
438 | dt_root_size_cells = OF_ROOT_NODE_SIZE_CELLS_DEFAULT; |
439 | dt_root_addr_cells = OF_ROOT_NODE_ADDR_CELLS_DEFAULT; | |
440 | ||
f00abd94 | 441 | prop = of_get_flat_dt_prop(node, "#size-cells", NULL); |
33714881 JK |
442 | if (prop) |
443 | dt_root_size_cells = be32_to_cpup(prop); | |
f00abd94 GL |
444 | pr_debug("dt_root_size_cells = %x\n", dt_root_size_cells); |
445 | ||
446 | prop = of_get_flat_dt_prop(node, "#address-cells", NULL); | |
33714881 JK |
447 | if (prop) |
448 | dt_root_addr_cells = be32_to_cpup(prop); | |
f00abd94 GL |
449 | pr_debug("dt_root_addr_cells = %x\n", dt_root_addr_cells); |
450 | ||
451 | /* break now */ | |
452 | return 1; | |
453 | } | |
454 | ||
2e89e685 | 455 | u64 __init dt_mem_next_cell(int s, __be32 **cellp) |
83f7a06e | 456 | { |
2e89e685 | 457 | __be32 *p = *cellp; |
83f7a06e GL |
458 | |
459 | *cellp = p + s; | |
460 | return of_read_number(p, s); | |
461 | } | |
462 | ||
51975db0 GL |
463 | /** |
464 | * early_init_dt_scan_memory - Look for an parse memory nodes | |
465 | */ | |
466 | int __init early_init_dt_scan_memory(unsigned long node, const char *uname, | |
467 | int depth, void *data) | |
468 | { | |
469 | char *type = of_get_flat_dt_prop(node, "device_type", NULL); | |
470 | __be32 *reg, *endp; | |
471 | unsigned long l; | |
472 | ||
473 | /* We are scanning "memory" nodes only */ | |
474 | if (type == NULL) { | |
475 | /* | |
476 | * The longtrail doesn't have a device_type on the | |
477 | * /memory node, so look for the node called /memory@0. | |
478 | */ | |
479 | if (depth != 1 || strcmp(uname, "memory@0") != 0) | |
480 | return 0; | |
481 | } else if (strcmp(type, "memory") != 0) | |
482 | return 0; | |
483 | ||
484 | reg = of_get_flat_dt_prop(node, "linux,usable-memory", &l); | |
485 | if (reg == NULL) | |
486 | reg = of_get_flat_dt_prop(node, "reg", &l); | |
487 | if (reg == NULL) | |
488 | return 0; | |
489 | ||
490 | endp = reg + (l / sizeof(__be32)); | |
491 | ||
492 | pr_debug("memory scan node %s, reg size %ld, data: %x %x %x %x,\n", | |
493 | uname, l, reg[0], reg[1], reg[2], reg[3]); | |
494 | ||
495 | while ((endp - reg) >= (dt_root_addr_cells + dt_root_size_cells)) { | |
496 | u64 base, size; | |
497 | ||
498 | base = dt_mem_next_cell(dt_root_addr_cells, ®); | |
499 | size = dt_mem_next_cell(dt_root_size_cells, ®); | |
500 | ||
501 | if (size == 0) | |
502 | continue; | |
503 | pr_debug(" - %llx , %llx\n", (unsigned long long)base, | |
504 | (unsigned long long)size); | |
505 | ||
506 | early_init_dt_add_memory_arch(base, size); | |
507 | } | |
508 | ||
509 | return 0; | |
510 | } | |
511 | ||
86e03221 GL |
512 | int __init early_init_dt_scan_chosen(unsigned long node, const char *uname, |
513 | int depth, void *data) | |
514 | { | |
515 | unsigned long l; | |
516 | char *p; | |
517 | ||
518 | pr_debug("search \"chosen\", depth: %d, uname: %s\n", depth, uname); | |
519 | ||
520 | if (depth != 1 || | |
521 | (strcmp(uname, "chosen") != 0 && strcmp(uname, "chosen@0") != 0)) | |
522 | return 0; | |
523 | ||
524 | early_init_dt_check_for_initrd(node); | |
525 | ||
526 | /* Retreive command line */ | |
527 | p = of_get_flat_dt_prop(node, "bootargs", &l); | |
528 | if (p != NULL && l > 0) | |
529 | strlcpy(cmd_line, p, min((int)l, COMMAND_LINE_SIZE)); | |
530 | ||
531 | #ifdef CONFIG_CMDLINE | |
532 | #ifndef CONFIG_CMDLINE_FORCE | |
533 | if (p == NULL || l == 0 || (l == 1 && (*p) == 0)) | |
534 | #endif | |
535 | strlcpy(cmd_line, CONFIG_CMDLINE, COMMAND_LINE_SIZE); | |
536 | #endif /* CONFIG_CMDLINE */ | |
537 | ||
86e03221 GL |
538 | pr_debug("Command line is: %s\n", cmd_line); |
539 | ||
540 | /* break now */ | |
541 | return 1; | |
542 | } | |
543 | ||
41f88009 GL |
544 | /** |
545 | * unflatten_device_tree - create tree of device_nodes from flat blob | |
546 | * | |
547 | * unflattens the device-tree passed by the firmware, creating the | |
548 | * tree of struct device_node. It also fills the "name" and "type" | |
549 | * pointers of the nodes so the normal device-tree walking functions | |
550 | * can be used. | |
551 | */ | |
552 | void __init unflatten_device_tree(void) | |
553 | { | |
554 | unsigned long start, mem, size; | |
555 | struct device_node **allnextp = &allnodes; | |
556 | ||
557 | pr_debug(" -> unflatten_device_tree()\n"); | |
558 | ||
8bfe9b5c GL |
559 | if (!initial_boot_params) { |
560 | pr_debug("No device tree pointer\n"); | |
561 | return; | |
562 | } | |
563 | ||
564 | pr_debug("Unflattening device tree:\n"); | |
565 | pr_debug("magic: %08x\n", be32_to_cpu(initial_boot_params->magic)); | |
566 | pr_debug("size: %08x\n", be32_to_cpu(initial_boot_params->totalsize)); | |
567 | pr_debug("version: %08x\n", be32_to_cpu(initial_boot_params->version)); | |
568 | ||
569 | if (be32_to_cpu(initial_boot_params->magic) != OF_DT_HEADER) { | |
570 | pr_err("Invalid device tree blob header\n"); | |
571 | return; | |
572 | } | |
573 | ||
41f88009 GL |
574 | /* First pass, scan for size */ |
575 | start = ((unsigned long)initial_boot_params) + | |
087f79c4 | 576 | be32_to_cpu(initial_boot_params->off_dt_struct); |
41f88009 GL |
577 | size = unflatten_dt_node(0, &start, NULL, NULL, 0); |
578 | size = (size | 3) + 1; | |
579 | ||
580 | pr_debug(" size is %lx, allocating...\n", size); | |
581 | ||
582 | /* Allocate memory for the expanded device tree */ | |
4ef7b373 JK |
583 | mem = early_init_dt_alloc_memory_arch(size + 4, |
584 | __alignof__(struct device_node)); | |
41f88009 GL |
585 | mem = (unsigned long) __va(mem); |
586 | ||
33714881 | 587 | ((__be32 *)mem)[size / 4] = cpu_to_be32(0xdeadbeef); |
41f88009 GL |
588 | |
589 | pr_debug(" unflattening %lx...\n", mem); | |
590 | ||
591 | /* Second pass, do actual unflattening */ | |
592 | start = ((unsigned long)initial_boot_params) + | |
087f79c4 | 593 | be32_to_cpu(initial_boot_params->off_dt_struct); |
41f88009 | 594 | unflatten_dt_node(mem, &start, NULL, &allnextp, 0); |
33714881 | 595 | if (be32_to_cpup((__be32 *)start) != OF_DT_END) |
41f88009 | 596 | pr_warning("Weird tag at end of tree: %08x\n", *((u32 *)start)); |
33714881 | 597 | if (be32_to_cpu(((__be32 *)mem)[size / 4]) != 0xdeadbeef) |
41f88009 | 598 | pr_warning("End of tree marker overwritten: %08x\n", |
33714881 | 599 | be32_to_cpu(((__be32 *)mem)[size / 4])); |
41f88009 GL |
600 | *allnextp = NULL; |
601 | ||
602 | /* Get pointer to OF "/chosen" node for use everywhere */ | |
603 | of_chosen = of_find_node_by_path("/chosen"); | |
604 | if (of_chosen == NULL) | |
605 | of_chosen = of_find_node_by_path("/chosen@0"); | |
606 | ||
607 | pr_debug(" <- unflatten_device_tree()\n"); | |
608 | } | |
e6ce1324 SN |
609 | |
610 | #endif /* CONFIG_OF_EARLY_FLATTREE */ |