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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 | ||
9706a36e SN |
25 | char *of_fdt_get_string(struct boot_param_header *blob, u32 offset) |
26 | { | |
27 | return ((char *)blob) + | |
28 | be32_to_cpu(blob->off_dt_strings) + offset; | |
29 | } | |
30 | ||
31 | /** | |
32 | * of_fdt_get_property - Given a node in the given flat blob, return | |
33 | * the property ptr | |
34 | */ | |
35 | void *of_fdt_get_property(struct boot_param_header *blob, | |
36 | unsigned long node, const char *name, | |
37 | unsigned long *size) | |
38 | { | |
39 | unsigned long p = node; | |
40 | ||
41 | do { | |
42 | u32 tag = be32_to_cpup((__be32 *)p); | |
43 | u32 sz, noff; | |
44 | const char *nstr; | |
45 | ||
46 | p += 4; | |
47 | if (tag == OF_DT_NOP) | |
48 | continue; | |
49 | if (tag != OF_DT_PROP) | |
50 | return NULL; | |
51 | ||
52 | sz = be32_to_cpup((__be32 *)p); | |
53 | noff = be32_to_cpup((__be32 *)(p + 4)); | |
54 | p += 8; | |
55 | if (be32_to_cpu(blob->version) < 0x10) | |
56 | p = ALIGN(p, sz >= 8 ? 8 : 4); | |
57 | ||
58 | nstr = of_fdt_get_string(blob, noff); | |
59 | if (nstr == NULL) { | |
60 | pr_warning("Can't find property index name !\n"); | |
61 | return NULL; | |
62 | } | |
63 | if (strcmp(name, nstr) == 0) { | |
64 | if (size) | |
65 | *size = sz; | |
66 | return (void *)p; | |
67 | } | |
68 | p += sz; | |
69 | p = ALIGN(p, 4); | |
70 | } while (1); | |
71 | } | |
72 | ||
73 | /** | |
74 | * of_fdt_is_compatible - Return true if given node from the given blob has | |
75 | * compat in its compatible list | |
76 | * @blob: A device tree blob | |
77 | * @node: node to test | |
78 | * @compat: compatible string to compare with compatible list. | |
79 | */ | |
80 | int of_fdt_is_compatible(struct boot_param_header *blob, | |
81 | unsigned long node, const char *compat) | |
82 | { | |
83 | const char *cp; | |
84 | unsigned long cplen, l; | |
85 | ||
86 | cp = of_fdt_get_property(blob, node, "compatible", &cplen); | |
87 | if (cp == NULL) | |
88 | return 0; | |
89 | while (cplen > 0) { | |
90 | if (of_compat_cmp(cp, compat, strlen(compat)) == 0) | |
91 | return 1; | |
92 | l = strlen(cp) + 1; | |
93 | cp += l; | |
94 | cplen -= l; | |
95 | } | |
96 | ||
97 | return 0; | |
98 | } | |
99 | ||
100 | /* Everything below here references initial_boot_params directly. */ | |
f00abd94 GL |
101 | int __initdata dt_root_addr_cells; |
102 | int __initdata dt_root_size_cells; | |
103 | ||
e169cfbe GL |
104 | struct boot_param_header *initial_boot_params; |
105 | ||
e6ce1324 SN |
106 | #ifdef CONFIG_OF_EARLY_FLATTREE |
107 | ||
c8cb7a59 GL |
108 | /** |
109 | * of_scan_flat_dt - scan flattened tree blob and call callback on each. | |
110 | * @it: callback function | |
111 | * @data: context data pointer | |
112 | * | |
113 | * This function is used to scan the flattened device-tree, it is | |
114 | * used to extract the memory information at boot before we can | |
115 | * unflatten the tree | |
116 | */ | |
117 | int __init of_scan_flat_dt(int (*it)(unsigned long node, | |
118 | const char *uname, int depth, | |
119 | void *data), | |
120 | void *data) | |
121 | { | |
122 | unsigned long p = ((unsigned long)initial_boot_params) + | |
087f79c4 | 123 | be32_to_cpu(initial_boot_params->off_dt_struct); |
c8cb7a59 GL |
124 | int rc = 0; |
125 | int depth = -1; | |
126 | ||
127 | do { | |
33714881 | 128 | u32 tag = be32_to_cpup((__be32 *)p); |
c8cb7a59 GL |
129 | char *pathp; |
130 | ||
131 | p += 4; | |
132 | if (tag == OF_DT_END_NODE) { | |
133 | depth--; | |
134 | continue; | |
135 | } | |
136 | if (tag == OF_DT_NOP) | |
137 | continue; | |
138 | if (tag == OF_DT_END) | |
139 | break; | |
140 | if (tag == OF_DT_PROP) { | |
33714881 | 141 | u32 sz = be32_to_cpup((__be32 *)p); |
c8cb7a59 | 142 | p += 8; |
087f79c4 | 143 | if (be32_to_cpu(initial_boot_params->version) < 0x10) |
f1d4c3a7 | 144 | p = ALIGN(p, sz >= 8 ? 8 : 4); |
c8cb7a59 | 145 | p += sz; |
f1d4c3a7 | 146 | p = ALIGN(p, 4); |
c8cb7a59 GL |
147 | continue; |
148 | } | |
149 | if (tag != OF_DT_BEGIN_NODE) { | |
150 | pr_err("Invalid tag %x in flat device tree!\n", tag); | |
151 | return -EINVAL; | |
152 | } | |
153 | depth++; | |
154 | pathp = (char *)p; | |
f1d4c3a7 | 155 | p = ALIGN(p + strlen(pathp) + 1, 4); |
c8cb7a59 GL |
156 | if ((*pathp) == '/') { |
157 | char *lp, *np; | |
158 | for (lp = NULL, np = pathp; *np; np++) | |
159 | if ((*np) == '/') | |
160 | lp = np+1; | |
161 | if (lp != NULL) | |
162 | pathp = lp; | |
163 | } | |
164 | rc = it(p, pathp, depth, data); | |
165 | if (rc != 0) | |
166 | break; | |
167 | } while (1); | |
168 | ||
169 | return rc; | |
170 | } | |
819d2819 GL |
171 | |
172 | /** | |
173 | * of_get_flat_dt_root - find the root node in the flat blob | |
174 | */ | |
175 | unsigned long __init of_get_flat_dt_root(void) | |
176 | { | |
177 | unsigned long p = ((unsigned long)initial_boot_params) + | |
087f79c4 | 178 | be32_to_cpu(initial_boot_params->off_dt_struct); |
819d2819 | 179 | |
33714881 | 180 | while (be32_to_cpup((__be32 *)p) == OF_DT_NOP) |
819d2819 | 181 | p += 4; |
33714881 | 182 | BUG_ON(be32_to_cpup((__be32 *)p) != OF_DT_BEGIN_NODE); |
819d2819 | 183 | p += 4; |
f1d4c3a7 | 184 | return ALIGN(p + strlen((char *)p) + 1, 4); |
819d2819 GL |
185 | } |
186 | ||
ca900cfa GL |
187 | /** |
188 | * of_get_flat_dt_prop - Given a node in the flat blob, return the property ptr | |
189 | * | |
190 | * This function can be used within scan_flattened_dt callback to get | |
191 | * access to properties | |
192 | */ | |
193 | void *__init of_get_flat_dt_prop(unsigned long node, const char *name, | |
194 | unsigned long *size) | |
195 | { | |
9706a36e | 196 | return of_fdt_get_property(initial_boot_params, node, name, size); |
ca900cfa GL |
197 | } |
198 | ||
00e38efd GL |
199 | /** |
200 | * of_flat_dt_is_compatible - Return true if given node has compat in compatible list | |
201 | * @node: node to test | |
202 | * @compat: compatible string to compare with compatible list. | |
203 | */ | |
204 | int __init of_flat_dt_is_compatible(unsigned long node, const char *compat) | |
205 | { | |
9706a36e | 206 | return of_fdt_is_compatible(initial_boot_params, node, compat); |
00e38efd GL |
207 | } |
208 | ||
bbd33931 GL |
209 | static void *__init unflatten_dt_alloc(unsigned long *mem, unsigned long size, |
210 | unsigned long align) | |
211 | { | |
212 | void *res; | |
213 | ||
f1d4c3a7 | 214 | *mem = ALIGN(*mem, align); |
bbd33931 GL |
215 | res = (void *)*mem; |
216 | *mem += size; | |
217 | ||
218 | return res; | |
219 | } | |
220 | ||
221 | /** | |
222 | * unflatten_dt_node - Alloc and populate a device_node from the flat tree | |
223 | * @p: pointer to node in flat tree | |
224 | * @dad: Parent struct device_node | |
225 | * @allnextpp: pointer to ->allnext from last allocated device_node | |
226 | * @fpsize: Size of the node path up at the current depth. | |
227 | */ | |
228 | unsigned long __init unflatten_dt_node(unsigned long mem, | |
229 | unsigned long *p, | |
230 | struct device_node *dad, | |
231 | struct device_node ***allnextpp, | |
232 | unsigned long fpsize) | |
233 | { | |
234 | struct device_node *np; | |
235 | struct property *pp, **prev_pp = NULL; | |
236 | char *pathp; | |
237 | u32 tag; | |
238 | unsigned int l, allocl; | |
239 | int has_name = 0; | |
240 | int new_format = 0; | |
241 | ||
33714881 | 242 | tag = be32_to_cpup((__be32 *)(*p)); |
bbd33931 GL |
243 | if (tag != OF_DT_BEGIN_NODE) { |
244 | pr_err("Weird tag at start of node: %x\n", tag); | |
245 | return mem; | |
246 | } | |
247 | *p += 4; | |
248 | pathp = (char *)*p; | |
249 | l = allocl = strlen(pathp) + 1; | |
f1d4c3a7 | 250 | *p = ALIGN(*p + l, 4); |
bbd33931 GL |
251 | |
252 | /* version 0x10 has a more compact unit name here instead of the full | |
253 | * path. we accumulate the full path size using "fpsize", we'll rebuild | |
254 | * it later. We detect this because the first character of the name is | |
255 | * not '/'. | |
256 | */ | |
257 | if ((*pathp) != '/') { | |
258 | new_format = 1; | |
259 | if (fpsize == 0) { | |
260 | /* root node: special case. fpsize accounts for path | |
261 | * plus terminating zero. root node only has '/', so | |
262 | * fpsize should be 2, but we want to avoid the first | |
263 | * level nodes to have two '/' so we use fpsize 1 here | |
264 | */ | |
265 | fpsize = 1; | |
266 | allocl = 2; | |
267 | } else { | |
268 | /* account for '/' and path size minus terminal 0 | |
269 | * already in 'l' | |
270 | */ | |
271 | fpsize += l; | |
272 | allocl = fpsize; | |
273 | } | |
274 | } | |
275 | ||
276 | np = unflatten_dt_alloc(&mem, sizeof(struct device_node) + allocl, | |
277 | __alignof__(struct device_node)); | |
278 | if (allnextpp) { | |
279 | memset(np, 0, sizeof(*np)); | |
280 | np->full_name = ((char *)np) + sizeof(struct device_node); | |
281 | if (new_format) { | |
282 | char *fn = np->full_name; | |
283 | /* rebuild full path for new format */ | |
284 | if (dad && dad->parent) { | |
285 | strcpy(fn, dad->full_name); | |
286 | #ifdef DEBUG | |
287 | if ((strlen(fn) + l + 1) != allocl) { | |
288 | pr_debug("%s: p: %d, l: %d, a: %d\n", | |
289 | pathp, (int)strlen(fn), | |
290 | l, allocl); | |
291 | } | |
292 | #endif | |
293 | fn += strlen(fn); | |
294 | } | |
295 | *(fn++) = '/'; | |
296 | memcpy(fn, pathp, l); | |
297 | } else | |
298 | memcpy(np->full_name, pathp, l); | |
299 | prev_pp = &np->properties; | |
300 | **allnextpp = np; | |
301 | *allnextpp = &np->allnext; | |
302 | if (dad != NULL) { | |
303 | np->parent = dad; | |
304 | /* we temporarily use the next field as `last_child'*/ | |
305 | if (dad->next == NULL) | |
306 | dad->child = np; | |
307 | else | |
308 | dad->next->sibling = np; | |
309 | dad->next = np; | |
310 | } | |
311 | kref_init(&np->kref); | |
312 | } | |
313 | while (1) { | |
314 | u32 sz, noff; | |
315 | char *pname; | |
316 | ||
33714881 | 317 | tag = be32_to_cpup((__be32 *)(*p)); |
bbd33931 GL |
318 | if (tag == OF_DT_NOP) { |
319 | *p += 4; | |
320 | continue; | |
321 | } | |
322 | if (tag != OF_DT_PROP) | |
323 | break; | |
324 | *p += 4; | |
33714881 JK |
325 | sz = be32_to_cpup((__be32 *)(*p)); |
326 | noff = be32_to_cpup((__be32 *)((*p) + 4)); | |
bbd33931 | 327 | *p += 8; |
087f79c4 | 328 | if (be32_to_cpu(initial_boot_params->version) < 0x10) |
f1d4c3a7 | 329 | *p = ALIGN(*p, sz >= 8 ? 8 : 4); |
bbd33931 | 330 | |
9706a36e | 331 | pname = of_fdt_get_string(initial_boot_params, noff); |
bbd33931 GL |
332 | if (pname == NULL) { |
333 | pr_info("Can't find property name in list !\n"); | |
334 | break; | |
335 | } | |
336 | if (strcmp(pname, "name") == 0) | |
337 | has_name = 1; | |
338 | l = strlen(pname) + 1; | |
339 | pp = unflatten_dt_alloc(&mem, sizeof(struct property), | |
340 | __alignof__(struct property)); | |
341 | if (allnextpp) { | |
04b954a6 DG |
342 | /* We accept flattened tree phandles either in |
343 | * ePAPR-style "phandle" properties, or the | |
344 | * legacy "linux,phandle" properties. If both | |
345 | * appear and have different values, things | |
346 | * will get weird. Don't do that. */ | |
347 | if ((strcmp(pname, "phandle") == 0) || | |
348 | (strcmp(pname, "linux,phandle") == 0)) { | |
6016a363 | 349 | if (np->phandle == 0) |
9a6b2e58 | 350 | np->phandle = be32_to_cpup((__be32*)*p); |
bbd33931 | 351 | } |
04b954a6 DG |
352 | /* And we process the "ibm,phandle" property |
353 | * used in pSeries dynamic device tree | |
354 | * stuff */ | |
bbd33931 | 355 | if (strcmp(pname, "ibm,phandle") == 0) |
9a6b2e58 | 356 | np->phandle = be32_to_cpup((__be32 *)*p); |
bbd33931 GL |
357 | pp->name = pname; |
358 | pp->length = sz; | |
359 | pp->value = (void *)*p; | |
360 | *prev_pp = pp; | |
361 | prev_pp = &pp->next; | |
362 | } | |
f1d4c3a7 | 363 | *p = ALIGN((*p) + sz, 4); |
bbd33931 GL |
364 | } |
365 | /* with version 0x10 we may not have the name property, recreate | |
366 | * it here from the unit name if absent | |
367 | */ | |
368 | if (!has_name) { | |
369 | char *p1 = pathp, *ps = pathp, *pa = NULL; | |
370 | int sz; | |
371 | ||
372 | while (*p1) { | |
373 | if ((*p1) == '@') | |
374 | pa = p1; | |
375 | if ((*p1) == '/') | |
376 | ps = p1 + 1; | |
377 | p1++; | |
378 | } | |
379 | if (pa < ps) | |
380 | pa = p1; | |
381 | sz = (pa - ps) + 1; | |
382 | pp = unflatten_dt_alloc(&mem, sizeof(struct property) + sz, | |
383 | __alignof__(struct property)); | |
384 | if (allnextpp) { | |
385 | pp->name = "name"; | |
386 | pp->length = sz; | |
387 | pp->value = pp + 1; | |
388 | *prev_pp = pp; | |
389 | prev_pp = &pp->next; | |
390 | memcpy(pp->value, ps, sz - 1); | |
391 | ((char *)pp->value)[sz - 1] = 0; | |
392 | pr_debug("fixed up name for %s -> %s\n", pathp, | |
393 | (char *)pp->value); | |
394 | } | |
395 | } | |
396 | if (allnextpp) { | |
397 | *prev_pp = NULL; | |
398 | np->name = of_get_property(np, "name", NULL); | |
399 | np->type = of_get_property(np, "device_type", NULL); | |
400 | ||
401 | if (!np->name) | |
402 | np->name = "<NULL>"; | |
403 | if (!np->type) | |
404 | np->type = "<NULL>"; | |
405 | } | |
7f809e1f JG |
406 | while (tag == OF_DT_BEGIN_NODE || tag == OF_DT_NOP) { |
407 | if (tag == OF_DT_NOP) | |
408 | *p += 4; | |
409 | else | |
410 | mem = unflatten_dt_node(mem, p, np, allnextpp, fpsize); | |
33714881 | 411 | tag = be32_to_cpup((__be32 *)(*p)); |
bbd33931 GL |
412 | } |
413 | if (tag != OF_DT_END_NODE) { | |
414 | pr_err("Weird tag at end of node: %x\n", tag); | |
415 | return mem; | |
416 | } | |
417 | *p += 4; | |
418 | return mem; | |
419 | } | |
41f88009 | 420 | |
f7b3a835 GL |
421 | #ifdef CONFIG_BLK_DEV_INITRD |
422 | /** | |
423 | * early_init_dt_check_for_initrd - Decode initrd location from flat tree | |
424 | * @node: reference to node containing initrd location ('chosen') | |
425 | */ | |
426 | void __init early_init_dt_check_for_initrd(unsigned long node) | |
427 | { | |
1406bc2f | 428 | unsigned long start, end, len; |
33714881 | 429 | __be32 *prop; |
f7b3a835 GL |
430 | |
431 | pr_debug("Looking for initrd properties... "); | |
432 | ||
433 | prop = of_get_flat_dt_prop(node, "linux,initrd-start", &len); | |
1406bc2f JK |
434 | if (!prop) |
435 | return; | |
436 | start = of_read_ulong(prop, len/4); | |
437 | ||
438 | prop = of_get_flat_dt_prop(node, "linux,initrd-end", &len); | |
439 | if (!prop) | |
440 | return; | |
441 | end = of_read_ulong(prop, len/4); | |
f7b3a835 | 442 | |
1406bc2f JK |
443 | early_init_dt_setup_initrd_arch(start, end); |
444 | pr_debug("initrd_start=0x%lx initrd_end=0x%lx\n", start, end); | |
f7b3a835 GL |
445 | } |
446 | #else | |
447 | inline void early_init_dt_check_for_initrd(unsigned long node) | |
448 | { | |
449 | } | |
450 | #endif /* CONFIG_BLK_DEV_INITRD */ | |
451 | ||
f00abd94 GL |
452 | /** |
453 | * early_init_dt_scan_root - fetch the top level address and size cells | |
454 | */ | |
455 | int __init early_init_dt_scan_root(unsigned long node, const char *uname, | |
456 | int depth, void *data) | |
457 | { | |
33714881 | 458 | __be32 *prop; |
f00abd94 GL |
459 | |
460 | if (depth != 0) | |
461 | return 0; | |
462 | ||
33714881 JK |
463 | dt_root_size_cells = OF_ROOT_NODE_SIZE_CELLS_DEFAULT; |
464 | dt_root_addr_cells = OF_ROOT_NODE_ADDR_CELLS_DEFAULT; | |
465 | ||
f00abd94 | 466 | prop = of_get_flat_dt_prop(node, "#size-cells", NULL); |
33714881 JK |
467 | if (prop) |
468 | dt_root_size_cells = be32_to_cpup(prop); | |
f00abd94 GL |
469 | pr_debug("dt_root_size_cells = %x\n", dt_root_size_cells); |
470 | ||
471 | prop = of_get_flat_dt_prop(node, "#address-cells", NULL); | |
33714881 JK |
472 | if (prop) |
473 | dt_root_addr_cells = be32_to_cpup(prop); | |
f00abd94 GL |
474 | pr_debug("dt_root_addr_cells = %x\n", dt_root_addr_cells); |
475 | ||
476 | /* break now */ | |
477 | return 1; | |
478 | } | |
479 | ||
2e89e685 | 480 | u64 __init dt_mem_next_cell(int s, __be32 **cellp) |
83f7a06e | 481 | { |
2e89e685 | 482 | __be32 *p = *cellp; |
83f7a06e GL |
483 | |
484 | *cellp = p + s; | |
485 | return of_read_number(p, s); | |
486 | } | |
487 | ||
51975db0 GL |
488 | /** |
489 | * early_init_dt_scan_memory - Look for an parse memory nodes | |
490 | */ | |
491 | int __init early_init_dt_scan_memory(unsigned long node, const char *uname, | |
492 | int depth, void *data) | |
493 | { | |
494 | char *type = of_get_flat_dt_prop(node, "device_type", NULL); | |
495 | __be32 *reg, *endp; | |
496 | unsigned long l; | |
497 | ||
498 | /* We are scanning "memory" nodes only */ | |
499 | if (type == NULL) { | |
500 | /* | |
501 | * The longtrail doesn't have a device_type on the | |
502 | * /memory node, so look for the node called /memory@0. | |
503 | */ | |
504 | if (depth != 1 || strcmp(uname, "memory@0") != 0) | |
505 | return 0; | |
506 | } else if (strcmp(type, "memory") != 0) | |
507 | return 0; | |
508 | ||
509 | reg = of_get_flat_dt_prop(node, "linux,usable-memory", &l); | |
510 | if (reg == NULL) | |
511 | reg = of_get_flat_dt_prop(node, "reg", &l); | |
512 | if (reg == NULL) | |
513 | return 0; | |
514 | ||
515 | endp = reg + (l / sizeof(__be32)); | |
516 | ||
517 | pr_debug("memory scan node %s, reg size %ld, data: %x %x %x %x,\n", | |
518 | uname, l, reg[0], reg[1], reg[2], reg[3]); | |
519 | ||
520 | while ((endp - reg) >= (dt_root_addr_cells + dt_root_size_cells)) { | |
521 | u64 base, size; | |
522 | ||
523 | base = dt_mem_next_cell(dt_root_addr_cells, ®); | |
524 | size = dt_mem_next_cell(dt_root_size_cells, ®); | |
525 | ||
526 | if (size == 0) | |
527 | continue; | |
528 | pr_debug(" - %llx , %llx\n", (unsigned long long)base, | |
529 | (unsigned long long)size); | |
530 | ||
531 | early_init_dt_add_memory_arch(base, size); | |
532 | } | |
533 | ||
534 | return 0; | |
535 | } | |
536 | ||
86e03221 GL |
537 | int __init early_init_dt_scan_chosen(unsigned long node, const char *uname, |
538 | int depth, void *data) | |
539 | { | |
540 | unsigned long l; | |
541 | char *p; | |
542 | ||
543 | pr_debug("search \"chosen\", depth: %d, uname: %s\n", depth, uname); | |
544 | ||
545 | if (depth != 1 || | |
546 | (strcmp(uname, "chosen") != 0 && strcmp(uname, "chosen@0") != 0)) | |
547 | return 0; | |
548 | ||
549 | early_init_dt_check_for_initrd(node); | |
550 | ||
551 | /* Retreive command line */ | |
552 | p = of_get_flat_dt_prop(node, "bootargs", &l); | |
553 | if (p != NULL && l > 0) | |
554 | strlcpy(cmd_line, p, min((int)l, COMMAND_LINE_SIZE)); | |
555 | ||
556 | #ifdef CONFIG_CMDLINE | |
557 | #ifndef CONFIG_CMDLINE_FORCE | |
558 | if (p == NULL || l == 0 || (l == 1 && (*p) == 0)) | |
559 | #endif | |
560 | strlcpy(cmd_line, CONFIG_CMDLINE, COMMAND_LINE_SIZE); | |
561 | #endif /* CONFIG_CMDLINE */ | |
562 | ||
86e03221 GL |
563 | pr_debug("Command line is: %s\n", cmd_line); |
564 | ||
565 | /* break now */ | |
566 | return 1; | |
567 | } | |
568 | ||
41f88009 GL |
569 | /** |
570 | * unflatten_device_tree - create tree of device_nodes from flat blob | |
571 | * | |
572 | * unflattens the device-tree passed by the firmware, creating the | |
573 | * tree of struct device_node. It also fills the "name" and "type" | |
574 | * pointers of the nodes so the normal device-tree walking functions | |
575 | * can be used. | |
576 | */ | |
577 | void __init unflatten_device_tree(void) | |
578 | { | |
579 | unsigned long start, mem, size; | |
580 | struct device_node **allnextp = &allnodes; | |
581 | ||
582 | pr_debug(" -> unflatten_device_tree()\n"); | |
583 | ||
8bfe9b5c GL |
584 | if (!initial_boot_params) { |
585 | pr_debug("No device tree pointer\n"); | |
586 | return; | |
587 | } | |
588 | ||
589 | pr_debug("Unflattening device tree:\n"); | |
590 | pr_debug("magic: %08x\n", be32_to_cpu(initial_boot_params->magic)); | |
591 | pr_debug("size: %08x\n", be32_to_cpu(initial_boot_params->totalsize)); | |
592 | pr_debug("version: %08x\n", be32_to_cpu(initial_boot_params->version)); | |
593 | ||
594 | if (be32_to_cpu(initial_boot_params->magic) != OF_DT_HEADER) { | |
595 | pr_err("Invalid device tree blob header\n"); | |
596 | return; | |
597 | } | |
598 | ||
41f88009 GL |
599 | /* First pass, scan for size */ |
600 | start = ((unsigned long)initial_boot_params) + | |
087f79c4 | 601 | be32_to_cpu(initial_boot_params->off_dt_struct); |
41f88009 GL |
602 | size = unflatten_dt_node(0, &start, NULL, NULL, 0); |
603 | size = (size | 3) + 1; | |
604 | ||
605 | pr_debug(" size is %lx, allocating...\n", size); | |
606 | ||
607 | /* Allocate memory for the expanded device tree */ | |
4ef7b373 JK |
608 | mem = early_init_dt_alloc_memory_arch(size + 4, |
609 | __alignof__(struct device_node)); | |
41f88009 GL |
610 | mem = (unsigned long) __va(mem); |
611 | ||
33714881 | 612 | ((__be32 *)mem)[size / 4] = cpu_to_be32(0xdeadbeef); |
41f88009 GL |
613 | |
614 | pr_debug(" unflattening %lx...\n", mem); | |
615 | ||
616 | /* Second pass, do actual unflattening */ | |
617 | start = ((unsigned long)initial_boot_params) + | |
087f79c4 | 618 | be32_to_cpu(initial_boot_params->off_dt_struct); |
41f88009 | 619 | unflatten_dt_node(mem, &start, NULL, &allnextp, 0); |
33714881 | 620 | if (be32_to_cpup((__be32 *)start) != OF_DT_END) |
41f88009 | 621 | pr_warning("Weird tag at end of tree: %08x\n", *((u32 *)start)); |
33714881 | 622 | if (be32_to_cpu(((__be32 *)mem)[size / 4]) != 0xdeadbeef) |
41f88009 | 623 | pr_warning("End of tree marker overwritten: %08x\n", |
33714881 | 624 | be32_to_cpu(((__be32 *)mem)[size / 4])); |
41f88009 GL |
625 | *allnextp = NULL; |
626 | ||
627 | /* Get pointer to OF "/chosen" node for use everywhere */ | |
628 | of_chosen = of_find_node_by_path("/chosen"); | |
629 | if (of_chosen == NULL) | |
630 | of_chosen = of_find_node_by_path("/chosen@0"); | |
631 | ||
632 | pr_debug(" <- unflatten_device_tree()\n"); | |
633 | } | |
e6ce1324 SN |
634 | |
635 | #endif /* CONFIG_OF_EARLY_FLATTREE */ |