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> |
fe140423 | 14 | #include <linux/module.h> |
e169cfbe GL |
15 | #include <linux/of.h> |
16 | #include <linux/of_fdt.h> | |
4ef7b373 JK |
17 | #include <linux/string.h> |
18 | #include <linux/errno.h> | |
fe140423 | 19 | #include <linux/slab.h> |
51975db0 | 20 | |
c89810ac | 21 | #include <asm/setup.h> /* for COMMAND_LINE_SIZE */ |
86e03221 GL |
22 | #ifdef CONFIG_PPC |
23 | #include <asm/machdep.h> | |
24 | #endif /* CONFIG_PPC */ | |
25 | ||
4ef7b373 JK |
26 | #include <asm/page.h> |
27 | ||
9706a36e SN |
28 | char *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 | * of_fdt_get_property - Given a node in the given flat blob, return | |
36 | * the property ptr | |
37 | */ | |
38 | void *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 | ||
76 | /** | |
77 | * of_fdt_is_compatible - Return true if given node from the given blob has | |
78 | * compat in its compatible list | |
79 | * @blob: A device tree blob | |
80 | * @node: node to test | |
81 | * @compat: compatible string to compare with compatible list. | |
a4f740cf GL |
82 | * |
83 | * On match, returns a non-zero value with smaller values returned for more | |
84 | * specific compatible values. | |
9706a36e SN |
85 | */ |
86 | int of_fdt_is_compatible(struct boot_param_header *blob, | |
87 | unsigned long node, const char *compat) | |
88 | { | |
89 | const char *cp; | |
a4f740cf | 90 | unsigned long cplen, l, score = 0; |
9706a36e SN |
91 | |
92 | cp = of_fdt_get_property(blob, node, "compatible", &cplen); | |
93 | if (cp == NULL) | |
94 | return 0; | |
95 | while (cplen > 0) { | |
a4f740cf | 96 | score++; |
9706a36e | 97 | if (of_compat_cmp(cp, compat, strlen(compat)) == 0) |
a4f740cf | 98 | return score; |
9706a36e SN |
99 | l = strlen(cp) + 1; |
100 | cp += l; | |
101 | cplen -= l; | |
102 | } | |
103 | ||
104 | return 0; | |
105 | } | |
106 | ||
a4f740cf GL |
107 | /** |
108 | * of_fdt_match - Return true if node matches a list of compatible values | |
109 | */ | |
110 | int of_fdt_match(struct boot_param_header *blob, unsigned long node, | |
7b482c83 | 111 | const char *const *compat) |
a4f740cf GL |
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 | ||
a40d6c4c | 128 | static void *unflatten_dt_alloc(unsigned long *mem, unsigned long size, |
bbd33931 GL |
129 | unsigned long align) |
130 | { | |
131 | void *res; | |
132 | ||
f1d4c3a7 | 133 | *mem = ALIGN(*mem, align); |
bbd33931 GL |
134 | res = (void *)*mem; |
135 | *mem += size; | |
136 | ||
137 | return res; | |
138 | } | |
139 | ||
140 | /** | |
141 | * unflatten_dt_node - Alloc and populate a device_node from the flat tree | |
a40d6c4c | 142 | * @blob: The parent device tree blob |
a7006c97 | 143 | * @mem: Memory chunk to use for allocating device nodes and properties |
bbd33931 GL |
144 | * @p: pointer to node in flat tree |
145 | * @dad: Parent struct device_node | |
146 | * @allnextpp: pointer to ->allnext from last allocated device_node | |
147 | * @fpsize: Size of the node path up at the current depth. | |
148 | */ | |
a7006c97 | 149 | static unsigned long unflatten_dt_node(struct boot_param_header *blob, |
a40d6c4c SN |
150 | unsigned long mem, |
151 | unsigned long *p, | |
152 | struct device_node *dad, | |
153 | struct device_node ***allnextpp, | |
154 | unsigned long fpsize) | |
bbd33931 GL |
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 | ||
33714881 | 164 | tag = be32_to_cpup((__be32 *)(*p)); |
bbd33931 GL |
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; | |
f1d4c3a7 | 172 | *p = ALIGN(*p + l, 4); |
bbd33931 GL |
173 | |
174 | /* version 0x10 has a more compact unit name here instead of the full | |
175 | * path. we accumulate the full path size using "fpsize", we'll rebuild | |
176 | * it later. We detect this because the first character of the name is | |
177 | * not '/'. | |
178 | */ | |
179 | if ((*pathp) != '/') { | |
180 | new_format = 1; | |
181 | if (fpsize == 0) { | |
182 | /* root node: special case. fpsize accounts for path | |
183 | * plus terminating zero. root node only has '/', so | |
184 | * fpsize should be 2, but we want to avoid the first | |
185 | * level nodes to have two '/' so we use fpsize 1 here | |
186 | */ | |
187 | fpsize = 1; | |
188 | allocl = 2; | |
189 | } else { | |
190 | /* account for '/' and path size minus terminal 0 | |
191 | * already in 'l' | |
192 | */ | |
193 | fpsize += l; | |
194 | allocl = fpsize; | |
195 | } | |
196 | } | |
197 | ||
198 | np = unflatten_dt_alloc(&mem, sizeof(struct device_node) + allocl, | |
199 | __alignof__(struct device_node)); | |
200 | if (allnextpp) { | |
201 | memset(np, 0, sizeof(*np)); | |
202 | np->full_name = ((char *)np) + sizeof(struct device_node); | |
203 | if (new_format) { | |
204 | char *fn = np->full_name; | |
205 | /* rebuild full path for new format */ | |
206 | if (dad && dad->parent) { | |
207 | strcpy(fn, dad->full_name); | |
208 | #ifdef DEBUG | |
209 | if ((strlen(fn) + l + 1) != allocl) { | |
210 | pr_debug("%s: p: %d, l: %d, a: %d\n", | |
211 | pathp, (int)strlen(fn), | |
212 | l, allocl); | |
213 | } | |
214 | #endif | |
215 | fn += strlen(fn); | |
216 | } | |
217 | *(fn++) = '/'; | |
218 | memcpy(fn, pathp, l); | |
219 | } else | |
220 | memcpy(np->full_name, pathp, l); | |
221 | prev_pp = &np->properties; | |
222 | **allnextpp = np; | |
223 | *allnextpp = &np->allnext; | |
224 | if (dad != NULL) { | |
225 | np->parent = dad; | |
226 | /* we temporarily use the next field as `last_child'*/ | |
227 | if (dad->next == NULL) | |
228 | dad->child = np; | |
229 | else | |
230 | dad->next->sibling = np; | |
231 | dad->next = np; | |
232 | } | |
233 | kref_init(&np->kref); | |
234 | } | |
a7006c97 | 235 | /* process properties */ |
bbd33931 GL |
236 | while (1) { |
237 | u32 sz, noff; | |
238 | char *pname; | |
239 | ||
33714881 | 240 | tag = be32_to_cpup((__be32 *)(*p)); |
bbd33931 GL |
241 | if (tag == OF_DT_NOP) { |
242 | *p += 4; | |
243 | continue; | |
244 | } | |
245 | if (tag != OF_DT_PROP) | |
246 | break; | |
247 | *p += 4; | |
33714881 JK |
248 | sz = be32_to_cpup((__be32 *)(*p)); |
249 | noff = be32_to_cpup((__be32 *)((*p) + 4)); | |
bbd33931 | 250 | *p += 8; |
a40d6c4c | 251 | if (be32_to_cpu(blob->version) < 0x10) |
f1d4c3a7 | 252 | *p = ALIGN(*p, sz >= 8 ? 8 : 4); |
bbd33931 | 253 | |
a40d6c4c | 254 | pname = of_fdt_get_string(blob, noff); |
bbd33931 GL |
255 | if (pname == NULL) { |
256 | pr_info("Can't find property name in list !\n"); | |
257 | break; | |
258 | } | |
259 | if (strcmp(pname, "name") == 0) | |
260 | has_name = 1; | |
261 | l = strlen(pname) + 1; | |
262 | pp = unflatten_dt_alloc(&mem, sizeof(struct property), | |
263 | __alignof__(struct property)); | |
264 | if (allnextpp) { | |
04b954a6 DG |
265 | /* We accept flattened tree phandles either in |
266 | * ePAPR-style "phandle" properties, or the | |
267 | * legacy "linux,phandle" properties. If both | |
268 | * appear and have different values, things | |
269 | * will get weird. Don't do that. */ | |
270 | if ((strcmp(pname, "phandle") == 0) || | |
271 | (strcmp(pname, "linux,phandle") == 0)) { | |
6016a363 | 272 | if (np->phandle == 0) |
9a6b2e58 | 273 | np->phandle = be32_to_cpup((__be32*)*p); |
bbd33931 | 274 | } |
04b954a6 DG |
275 | /* And we process the "ibm,phandle" property |
276 | * used in pSeries dynamic device tree | |
277 | * stuff */ | |
bbd33931 | 278 | if (strcmp(pname, "ibm,phandle") == 0) |
9a6b2e58 | 279 | np->phandle = be32_to_cpup((__be32 *)*p); |
bbd33931 GL |
280 | pp->name = pname; |
281 | pp->length = sz; | |
282 | pp->value = (void *)*p; | |
283 | *prev_pp = pp; | |
284 | prev_pp = &pp->next; | |
285 | } | |
f1d4c3a7 | 286 | *p = ALIGN((*p) + sz, 4); |
bbd33931 GL |
287 | } |
288 | /* with version 0x10 we may not have the name property, recreate | |
289 | * it here from the unit name if absent | |
290 | */ | |
291 | if (!has_name) { | |
292 | char *p1 = pathp, *ps = pathp, *pa = NULL; | |
293 | int sz; | |
294 | ||
295 | while (*p1) { | |
296 | if ((*p1) == '@') | |
297 | pa = p1; | |
298 | if ((*p1) == '/') | |
299 | ps = p1 + 1; | |
300 | p1++; | |
301 | } | |
302 | if (pa < ps) | |
303 | pa = p1; | |
304 | sz = (pa - ps) + 1; | |
305 | pp = unflatten_dt_alloc(&mem, sizeof(struct property) + sz, | |
306 | __alignof__(struct property)); | |
307 | if (allnextpp) { | |
308 | pp->name = "name"; | |
309 | pp->length = sz; | |
310 | pp->value = pp + 1; | |
311 | *prev_pp = pp; | |
312 | prev_pp = &pp->next; | |
313 | memcpy(pp->value, ps, sz - 1); | |
314 | ((char *)pp->value)[sz - 1] = 0; | |
315 | pr_debug("fixed up name for %s -> %s\n", pathp, | |
316 | (char *)pp->value); | |
317 | } | |
318 | } | |
319 | if (allnextpp) { | |
320 | *prev_pp = NULL; | |
321 | np->name = of_get_property(np, "name", NULL); | |
322 | np->type = of_get_property(np, "device_type", NULL); | |
323 | ||
324 | if (!np->name) | |
325 | np->name = "<NULL>"; | |
326 | if (!np->type) | |
327 | np->type = "<NULL>"; | |
328 | } | |
7f809e1f JG |
329 | while (tag == OF_DT_BEGIN_NODE || tag == OF_DT_NOP) { |
330 | if (tag == OF_DT_NOP) | |
331 | *p += 4; | |
332 | else | |
a40d6c4c SN |
333 | mem = unflatten_dt_node(blob, mem, p, np, allnextpp, |
334 | fpsize); | |
33714881 | 335 | tag = be32_to_cpup((__be32 *)(*p)); |
bbd33931 GL |
336 | } |
337 | if (tag != OF_DT_END_NODE) { | |
338 | pr_err("Weird tag at end of node: %x\n", tag); | |
339 | return mem; | |
340 | } | |
341 | *p += 4; | |
342 | return mem; | |
343 | } | |
41f88009 | 344 | |
fe140423 SN |
345 | /** |
346 | * __unflatten_device_tree - create tree of device_nodes from flat blob | |
347 | * | |
348 | * unflattens a device-tree, creating the | |
349 | * tree of struct device_node. It also fills the "name" and "type" | |
350 | * pointers of the nodes so the normal device-tree walking functions | |
351 | * can be used. | |
352 | * @blob: The blob to expand | |
353 | * @mynodes: The device_node tree created by the call | |
354 | * @dt_alloc: An allocator that provides a virtual address to memory | |
355 | * for the resulting tree | |
356 | */ | |
a7006c97 | 357 | static void __unflatten_device_tree(struct boot_param_header *blob, |
fe140423 SN |
358 | struct device_node **mynodes, |
359 | void * (*dt_alloc)(u64 size, u64 align)) | |
360 | { | |
361 | unsigned long start, mem, size; | |
362 | struct device_node **allnextp = mynodes; | |
363 | ||
364 | pr_debug(" -> unflatten_device_tree()\n"); | |
365 | ||
366 | if (!blob) { | |
367 | pr_debug("No device tree pointer\n"); | |
368 | return; | |
369 | } | |
370 | ||
371 | pr_debug("Unflattening device tree:\n"); | |
372 | pr_debug("magic: %08x\n", be32_to_cpu(blob->magic)); | |
373 | pr_debug("size: %08x\n", be32_to_cpu(blob->totalsize)); | |
374 | pr_debug("version: %08x\n", be32_to_cpu(blob->version)); | |
375 | ||
376 | if (be32_to_cpu(blob->magic) != OF_DT_HEADER) { | |
377 | pr_err("Invalid device tree blob header\n"); | |
378 | return; | |
379 | } | |
380 | ||
381 | /* First pass, scan for size */ | |
382 | start = ((unsigned long)blob) + | |
383 | be32_to_cpu(blob->off_dt_struct); | |
384 | size = unflatten_dt_node(blob, 0, &start, NULL, NULL, 0); | |
385 | size = (size | 3) + 1; | |
386 | ||
387 | pr_debug(" size is %lx, allocating...\n", size); | |
388 | ||
389 | /* Allocate memory for the expanded device tree */ | |
390 | mem = (unsigned long) | |
391 | dt_alloc(size + 4, __alignof__(struct device_node)); | |
392 | ||
393 | ((__be32 *)mem)[size / 4] = cpu_to_be32(0xdeadbeef); | |
394 | ||
395 | pr_debug(" unflattening %lx...\n", mem); | |
396 | ||
397 | /* Second pass, do actual unflattening */ | |
398 | start = ((unsigned long)blob) + | |
399 | be32_to_cpu(blob->off_dt_struct); | |
400 | unflatten_dt_node(blob, mem, &start, NULL, &allnextp, 0); | |
401 | if (be32_to_cpup((__be32 *)start) != OF_DT_END) | |
402 | pr_warning("Weird tag at end of tree: %08x\n", *((u32 *)start)); | |
403 | if (be32_to_cpu(((__be32 *)mem)[size / 4]) != 0xdeadbeef) | |
404 | pr_warning("End of tree marker overwritten: %08x\n", | |
405 | be32_to_cpu(((__be32 *)mem)[size / 4])); | |
406 | *allnextp = NULL; | |
407 | ||
408 | pr_debug(" <- unflatten_device_tree()\n"); | |
409 | } | |
410 | ||
411 | static void *kernel_tree_alloc(u64 size, u64 align) | |
412 | { | |
413 | return kzalloc(size, GFP_KERNEL); | |
414 | } | |
415 | ||
416 | /** | |
417 | * of_fdt_unflatten_tree - create tree of device_nodes from flat blob | |
418 | * | |
419 | * unflattens the device-tree passed by the firmware, creating the | |
420 | * tree of struct device_node. It also fills the "name" and "type" | |
421 | * pointers of the nodes so the normal device-tree walking functions | |
422 | * can be used. | |
423 | */ | |
424 | void of_fdt_unflatten_tree(unsigned long *blob, | |
425 | struct device_node **mynodes) | |
426 | { | |
427 | struct boot_param_header *device_tree = | |
428 | (struct boot_param_header *)blob; | |
429 | __unflatten_device_tree(device_tree, mynodes, &kernel_tree_alloc); | |
430 | } | |
431 | EXPORT_SYMBOL_GPL(of_fdt_unflatten_tree); | |
432 | ||
57d00ecf SN |
433 | /* Everything below here references initial_boot_params directly. */ |
434 | int __initdata dt_root_addr_cells; | |
435 | int __initdata dt_root_size_cells; | |
436 | ||
437 | struct boot_param_header *initial_boot_params; | |
438 | ||
439 | #ifdef CONFIG_OF_EARLY_FLATTREE | |
440 | ||
441 | /** | |
442 | * of_scan_flat_dt - scan flattened tree blob and call callback on each. | |
443 | * @it: callback function | |
444 | * @data: context data pointer | |
445 | * | |
446 | * This function is used to scan the flattened device-tree, it is | |
447 | * used to extract the memory information at boot before we can | |
448 | * unflatten the tree | |
449 | */ | |
450 | int __init of_scan_flat_dt(int (*it)(unsigned long node, | |
451 | const char *uname, int depth, | |
452 | void *data), | |
453 | void *data) | |
454 | { | |
455 | unsigned long p = ((unsigned long)initial_boot_params) + | |
456 | be32_to_cpu(initial_boot_params->off_dt_struct); | |
457 | int rc = 0; | |
458 | int depth = -1; | |
459 | ||
460 | do { | |
461 | u32 tag = be32_to_cpup((__be32 *)p); | |
462 | char *pathp; | |
463 | ||
464 | p += 4; | |
465 | if (tag == OF_DT_END_NODE) { | |
466 | depth--; | |
467 | continue; | |
468 | } | |
469 | if (tag == OF_DT_NOP) | |
470 | continue; | |
471 | if (tag == OF_DT_END) | |
472 | break; | |
473 | if (tag == OF_DT_PROP) { | |
474 | u32 sz = be32_to_cpup((__be32 *)p); | |
475 | p += 8; | |
476 | if (be32_to_cpu(initial_boot_params->version) < 0x10) | |
477 | p = ALIGN(p, sz >= 8 ? 8 : 4); | |
478 | p += sz; | |
479 | p = ALIGN(p, 4); | |
480 | continue; | |
481 | } | |
482 | if (tag != OF_DT_BEGIN_NODE) { | |
483 | pr_err("Invalid tag %x in flat device tree!\n", tag); | |
484 | return -EINVAL; | |
485 | } | |
486 | depth++; | |
487 | pathp = (char *)p; | |
488 | p = ALIGN(p + strlen(pathp) + 1, 4); | |
489 | if ((*pathp) == '/') { | |
490 | char *lp, *np; | |
491 | for (lp = NULL, np = pathp; *np; np++) | |
492 | if ((*np) == '/') | |
493 | lp = np+1; | |
494 | if (lp != NULL) | |
495 | pathp = lp; | |
496 | } | |
497 | rc = it(p, pathp, depth, data); | |
498 | if (rc != 0) | |
499 | break; | |
500 | } while (1); | |
501 | ||
502 | return rc; | |
503 | } | |
504 | ||
505 | /** | |
506 | * of_get_flat_dt_root - find the root node in the flat blob | |
507 | */ | |
508 | unsigned long __init of_get_flat_dt_root(void) | |
509 | { | |
510 | unsigned long p = ((unsigned long)initial_boot_params) + | |
511 | be32_to_cpu(initial_boot_params->off_dt_struct); | |
512 | ||
513 | while (be32_to_cpup((__be32 *)p) == OF_DT_NOP) | |
514 | p += 4; | |
515 | BUG_ON(be32_to_cpup((__be32 *)p) != OF_DT_BEGIN_NODE); | |
516 | p += 4; | |
517 | return ALIGN(p + strlen((char *)p) + 1, 4); | |
518 | } | |
519 | ||
520 | /** | |
521 | * of_get_flat_dt_prop - Given a node in the flat blob, return the property ptr | |
522 | * | |
523 | * This function can be used within scan_flattened_dt callback to get | |
524 | * access to properties | |
525 | */ | |
526 | void *__init of_get_flat_dt_prop(unsigned long node, const char *name, | |
527 | unsigned long *size) | |
528 | { | |
529 | return of_fdt_get_property(initial_boot_params, node, name, size); | |
530 | } | |
531 | ||
532 | /** | |
533 | * of_flat_dt_is_compatible - Return true if given node has compat in compatible list | |
534 | * @node: node to test | |
535 | * @compat: compatible string to compare with compatible list. | |
536 | */ | |
537 | int __init of_flat_dt_is_compatible(unsigned long node, const char *compat) | |
538 | { | |
539 | return of_fdt_is_compatible(initial_boot_params, node, compat); | |
540 | } | |
541 | ||
a4f740cf GL |
542 | /** |
543 | * of_flat_dt_match - Return true if node matches a list of compatible values | |
544 | */ | |
7b482c83 | 545 | int __init of_flat_dt_match(unsigned long node, const char *const *compat) |
a4f740cf GL |
546 | { |
547 | return of_fdt_match(initial_boot_params, node, compat); | |
548 | } | |
549 | ||
f7b3a835 GL |
550 | #ifdef CONFIG_BLK_DEV_INITRD |
551 | /** | |
552 | * early_init_dt_check_for_initrd - Decode initrd location from flat tree | |
553 | * @node: reference to node containing initrd location ('chosen') | |
554 | */ | |
555 | void __init early_init_dt_check_for_initrd(unsigned long node) | |
556 | { | |
1406bc2f | 557 | unsigned long start, end, len; |
33714881 | 558 | __be32 *prop; |
f7b3a835 GL |
559 | |
560 | pr_debug("Looking for initrd properties... "); | |
561 | ||
562 | prop = of_get_flat_dt_prop(node, "linux,initrd-start", &len); | |
1406bc2f JK |
563 | if (!prop) |
564 | return; | |
565 | start = of_read_ulong(prop, len/4); | |
566 | ||
567 | prop = of_get_flat_dt_prop(node, "linux,initrd-end", &len); | |
568 | if (!prop) | |
569 | return; | |
570 | end = of_read_ulong(prop, len/4); | |
f7b3a835 | 571 | |
1406bc2f JK |
572 | early_init_dt_setup_initrd_arch(start, end); |
573 | pr_debug("initrd_start=0x%lx initrd_end=0x%lx\n", start, end); | |
f7b3a835 GL |
574 | } |
575 | #else | |
576 | inline void early_init_dt_check_for_initrd(unsigned long node) | |
577 | { | |
578 | } | |
579 | #endif /* CONFIG_BLK_DEV_INITRD */ | |
580 | ||
f00abd94 GL |
581 | /** |
582 | * early_init_dt_scan_root - fetch the top level address and size cells | |
583 | */ | |
584 | int __init early_init_dt_scan_root(unsigned long node, const char *uname, | |
585 | int depth, void *data) | |
586 | { | |
33714881 | 587 | __be32 *prop; |
f00abd94 GL |
588 | |
589 | if (depth != 0) | |
590 | return 0; | |
591 | ||
33714881 JK |
592 | dt_root_size_cells = OF_ROOT_NODE_SIZE_CELLS_DEFAULT; |
593 | dt_root_addr_cells = OF_ROOT_NODE_ADDR_CELLS_DEFAULT; | |
594 | ||
f00abd94 | 595 | prop = of_get_flat_dt_prop(node, "#size-cells", NULL); |
33714881 JK |
596 | if (prop) |
597 | dt_root_size_cells = be32_to_cpup(prop); | |
f00abd94 GL |
598 | pr_debug("dt_root_size_cells = %x\n", dt_root_size_cells); |
599 | ||
600 | prop = of_get_flat_dt_prop(node, "#address-cells", NULL); | |
33714881 JK |
601 | if (prop) |
602 | dt_root_addr_cells = be32_to_cpup(prop); | |
f00abd94 GL |
603 | pr_debug("dt_root_addr_cells = %x\n", dt_root_addr_cells); |
604 | ||
605 | /* break now */ | |
606 | return 1; | |
607 | } | |
608 | ||
2e89e685 | 609 | u64 __init dt_mem_next_cell(int s, __be32 **cellp) |
83f7a06e | 610 | { |
2e89e685 | 611 | __be32 *p = *cellp; |
83f7a06e GL |
612 | |
613 | *cellp = p + s; | |
614 | return of_read_number(p, s); | |
615 | } | |
616 | ||
51975db0 GL |
617 | /** |
618 | * early_init_dt_scan_memory - Look for an parse memory nodes | |
619 | */ | |
620 | int __init early_init_dt_scan_memory(unsigned long node, const char *uname, | |
621 | int depth, void *data) | |
622 | { | |
623 | char *type = of_get_flat_dt_prop(node, "device_type", NULL); | |
624 | __be32 *reg, *endp; | |
625 | unsigned long l; | |
626 | ||
627 | /* We are scanning "memory" nodes only */ | |
628 | if (type == NULL) { | |
629 | /* | |
630 | * The longtrail doesn't have a device_type on the | |
631 | * /memory node, so look for the node called /memory@0. | |
632 | */ | |
633 | if (depth != 1 || strcmp(uname, "memory@0") != 0) | |
634 | return 0; | |
635 | } else if (strcmp(type, "memory") != 0) | |
636 | return 0; | |
637 | ||
638 | reg = of_get_flat_dt_prop(node, "linux,usable-memory", &l); | |
639 | if (reg == NULL) | |
640 | reg = of_get_flat_dt_prop(node, "reg", &l); | |
641 | if (reg == NULL) | |
642 | return 0; | |
643 | ||
644 | endp = reg + (l / sizeof(__be32)); | |
645 | ||
646 | pr_debug("memory scan node %s, reg size %ld, data: %x %x %x %x,\n", | |
647 | uname, l, reg[0], reg[1], reg[2], reg[3]); | |
648 | ||
649 | while ((endp - reg) >= (dt_root_addr_cells + dt_root_size_cells)) { | |
650 | u64 base, size; | |
651 | ||
652 | base = dt_mem_next_cell(dt_root_addr_cells, ®); | |
653 | size = dt_mem_next_cell(dt_root_size_cells, ®); | |
654 | ||
655 | if (size == 0) | |
656 | continue; | |
657 | pr_debug(" - %llx , %llx\n", (unsigned long long)base, | |
658 | (unsigned long long)size); | |
659 | ||
660 | early_init_dt_add_memory_arch(base, size); | |
661 | } | |
662 | ||
663 | return 0; | |
664 | } | |
665 | ||
86e03221 GL |
666 | int __init early_init_dt_scan_chosen(unsigned long node, const char *uname, |
667 | int depth, void *data) | |
668 | { | |
669 | unsigned long l; | |
670 | char *p; | |
671 | ||
672 | pr_debug("search \"chosen\", depth: %d, uname: %s\n", depth, uname); | |
673 | ||
85f60ae4 | 674 | if (depth != 1 || !data || |
86e03221 GL |
675 | (strcmp(uname, "chosen") != 0 && strcmp(uname, "chosen@0") != 0)) |
676 | return 0; | |
677 | ||
678 | early_init_dt_check_for_initrd(node); | |
679 | ||
25985edc | 680 | /* Retrieve command line */ |
86e03221 GL |
681 | p = of_get_flat_dt_prop(node, "bootargs", &l); |
682 | if (p != NULL && l > 0) | |
85f60ae4 | 683 | strlcpy(data, p, min((int)l, COMMAND_LINE_SIZE)); |
86e03221 | 684 | |
78b782cb BH |
685 | /* |
686 | * CONFIG_CMDLINE is meant to be a default in case nothing else | |
687 | * managed to set the command line, unless CONFIG_CMDLINE_FORCE | |
688 | * is set in which case we override whatever was found earlier. | |
689 | */ | |
86e03221 GL |
690 | #ifdef CONFIG_CMDLINE |
691 | #ifndef CONFIG_CMDLINE_FORCE | |
78b782cb | 692 | if (!((char *)data)[0]) |
86e03221 | 693 | #endif |
85f60ae4 | 694 | strlcpy(data, CONFIG_CMDLINE, COMMAND_LINE_SIZE); |
86e03221 GL |
695 | #endif /* CONFIG_CMDLINE */ |
696 | ||
85f60ae4 | 697 | pr_debug("Command line is: %s\n", (char*)data); |
86e03221 GL |
698 | |
699 | /* break now */ | |
700 | return 1; | |
701 | } | |
702 | ||
41f88009 GL |
703 | /** |
704 | * unflatten_device_tree - create tree of device_nodes from flat blob | |
705 | * | |
706 | * unflattens the device-tree passed by the firmware, creating the | |
707 | * tree of struct device_node. It also fills the "name" and "type" | |
708 | * pointers of the nodes so the normal device-tree walking functions | |
709 | * can be used. | |
710 | */ | |
711 | void __init unflatten_device_tree(void) | |
712 | { | |
fe140423 | 713 | __unflatten_device_tree(initial_boot_params, &allnodes, |
672c5446 | 714 | early_init_dt_alloc_memory_arch); |
41f88009 | 715 | |
611cad72 SG |
716 | /* Get pointer to "/chosen" and "/aliasas" nodes for use everywhere */ |
717 | of_alias_scan(early_init_dt_alloc_memory_arch); | |
41f88009 | 718 | } |
e6ce1324 SN |
719 | |
720 | #endif /* CONFIG_OF_EARLY_FLATTREE */ |