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 | ||
eb52d580 | 26 | #include <asm/setup.h> |
4ef7b373 JK |
27 | #include <asm/page.h> |
28 | ||
9706a36e SN |
29 | char *of_fdt_get_string(struct boot_param_header *blob, u32 offset) |
30 | { | |
31 | return ((char *)blob) + | |
32 | be32_to_cpu(blob->off_dt_strings) + offset; | |
33 | } | |
34 | ||
35 | /** | |
36 | * of_fdt_get_property - Given a node in the given flat blob, return | |
37 | * the property ptr | |
38 | */ | |
39 | void *of_fdt_get_property(struct boot_param_header *blob, | |
40 | unsigned long node, const char *name, | |
41 | unsigned long *size) | |
42 | { | |
43 | unsigned long p = node; | |
44 | ||
45 | do { | |
46 | u32 tag = be32_to_cpup((__be32 *)p); | |
47 | u32 sz, noff; | |
48 | const char *nstr; | |
49 | ||
50 | p += 4; | |
51 | if (tag == OF_DT_NOP) | |
52 | continue; | |
53 | if (tag != OF_DT_PROP) | |
54 | return NULL; | |
55 | ||
56 | sz = be32_to_cpup((__be32 *)p); | |
57 | noff = be32_to_cpup((__be32 *)(p + 4)); | |
58 | p += 8; | |
59 | if (be32_to_cpu(blob->version) < 0x10) | |
60 | p = ALIGN(p, sz >= 8 ? 8 : 4); | |
61 | ||
62 | nstr = of_fdt_get_string(blob, noff); | |
63 | if (nstr == NULL) { | |
64 | pr_warning("Can't find property index name !\n"); | |
65 | return NULL; | |
66 | } | |
67 | if (strcmp(name, nstr) == 0) { | |
68 | if (size) | |
69 | *size = sz; | |
70 | return (void *)p; | |
71 | } | |
72 | p += sz; | |
73 | p = ALIGN(p, 4); | |
74 | } while (1); | |
75 | } | |
76 | ||
77 | /** | |
78 | * of_fdt_is_compatible - Return true if given node from the given blob has | |
79 | * compat in its compatible list | |
80 | * @blob: A device tree blob | |
81 | * @node: node to test | |
82 | * @compat: compatible string to compare with compatible list. | |
a4f740cf GL |
83 | * |
84 | * On match, returns a non-zero value with smaller values returned for more | |
85 | * specific compatible values. | |
9706a36e SN |
86 | */ |
87 | int of_fdt_is_compatible(struct boot_param_header *blob, | |
88 | unsigned long node, const char *compat) | |
89 | { | |
90 | const char *cp; | |
a4f740cf | 91 | unsigned long cplen, l, score = 0; |
9706a36e SN |
92 | |
93 | cp = of_fdt_get_property(blob, node, "compatible", &cplen); | |
94 | if (cp == NULL) | |
95 | return 0; | |
96 | while (cplen > 0) { | |
a4f740cf | 97 | score++; |
9706a36e | 98 | if (of_compat_cmp(cp, compat, strlen(compat)) == 0) |
a4f740cf | 99 | return score; |
9706a36e SN |
100 | l = strlen(cp) + 1; |
101 | cp += l; | |
102 | cplen -= l; | |
103 | } | |
104 | ||
105 | return 0; | |
106 | } | |
107 | ||
a4f740cf GL |
108 | /** |
109 | * of_fdt_match - Return true if node matches a list of compatible values | |
110 | */ | |
111 | int of_fdt_match(struct boot_param_header *blob, unsigned long node, | |
7b482c83 | 112 | const char *const *compat) |
a4f740cf GL |
113 | { |
114 | unsigned int tmp, score = 0; | |
115 | ||
116 | if (!compat) | |
117 | return 0; | |
118 | ||
119 | while (*compat) { | |
120 | tmp = of_fdt_is_compatible(blob, node, *compat); | |
121 | if (tmp && (score == 0 || (tmp < score))) | |
122 | score = tmp; | |
123 | compat++; | |
124 | } | |
125 | ||
126 | return score; | |
127 | } | |
128 | ||
a40d6c4c | 129 | static void *unflatten_dt_alloc(unsigned long *mem, unsigned long size, |
bbd33931 GL |
130 | unsigned long align) |
131 | { | |
132 | void *res; | |
133 | ||
f1d4c3a7 | 134 | *mem = ALIGN(*mem, align); |
bbd33931 GL |
135 | res = (void *)*mem; |
136 | *mem += size; | |
137 | ||
138 | return res; | |
139 | } | |
140 | ||
141 | /** | |
142 | * unflatten_dt_node - Alloc and populate a device_node from the flat tree | |
a40d6c4c | 143 | * @blob: The parent device tree blob |
a7006c97 | 144 | * @mem: Memory chunk to use for allocating device nodes and properties |
bbd33931 GL |
145 | * @p: pointer to node in flat tree |
146 | * @dad: Parent struct device_node | |
147 | * @allnextpp: pointer to ->allnext from last allocated device_node | |
148 | * @fpsize: Size of the node path up at the current depth. | |
149 | */ | |
a7006c97 | 150 | static unsigned long unflatten_dt_node(struct boot_param_header *blob, |
a40d6c4c SN |
151 | unsigned long mem, |
152 | unsigned long *p, | |
153 | struct device_node *dad, | |
154 | struct device_node ***allnextpp, | |
155 | unsigned long fpsize) | |
bbd33931 GL |
156 | { |
157 | struct device_node *np; | |
158 | struct property *pp, **prev_pp = NULL; | |
159 | char *pathp; | |
160 | u32 tag; | |
161 | unsigned int l, allocl; | |
162 | int has_name = 0; | |
163 | int new_format = 0; | |
164 | ||
33714881 | 165 | tag = be32_to_cpup((__be32 *)(*p)); |
bbd33931 GL |
166 | if (tag != OF_DT_BEGIN_NODE) { |
167 | pr_err("Weird tag at start of node: %x\n", tag); | |
168 | return mem; | |
169 | } | |
170 | *p += 4; | |
171 | pathp = (char *)*p; | |
172 | l = allocl = strlen(pathp) + 1; | |
f1d4c3a7 | 173 | *p = ALIGN(*p + l, 4); |
bbd33931 GL |
174 | |
175 | /* version 0x10 has a more compact unit name here instead of the full | |
176 | * path. we accumulate the full path size using "fpsize", we'll rebuild | |
177 | * it later. We detect this because the first character of the name is | |
178 | * not '/'. | |
179 | */ | |
180 | if ((*pathp) != '/') { | |
181 | new_format = 1; | |
182 | if (fpsize == 0) { | |
183 | /* root node: special case. fpsize accounts for path | |
184 | * plus terminating zero. root node only has '/', so | |
185 | * fpsize should be 2, but we want to avoid the first | |
186 | * level nodes to have two '/' so we use fpsize 1 here | |
187 | */ | |
188 | fpsize = 1; | |
189 | allocl = 2; | |
190 | } else { | |
191 | /* account for '/' and path size minus terminal 0 | |
192 | * already in 'l' | |
193 | */ | |
194 | fpsize += l; | |
195 | allocl = fpsize; | |
196 | } | |
197 | } | |
198 | ||
199 | np = unflatten_dt_alloc(&mem, sizeof(struct device_node) + allocl, | |
200 | __alignof__(struct device_node)); | |
201 | if (allnextpp) { | |
202 | memset(np, 0, sizeof(*np)); | |
203 | np->full_name = ((char *)np) + sizeof(struct device_node); | |
204 | if (new_format) { | |
205 | char *fn = np->full_name; | |
206 | /* rebuild full path for new format */ | |
207 | if (dad && dad->parent) { | |
208 | strcpy(fn, dad->full_name); | |
209 | #ifdef DEBUG | |
210 | if ((strlen(fn) + l + 1) != allocl) { | |
211 | pr_debug("%s: p: %d, l: %d, a: %d\n", | |
212 | pathp, (int)strlen(fn), | |
213 | l, allocl); | |
214 | } | |
215 | #endif | |
216 | fn += strlen(fn); | |
217 | } | |
218 | *(fn++) = '/'; | |
219 | memcpy(fn, pathp, l); | |
220 | } else | |
221 | memcpy(np->full_name, pathp, l); | |
222 | prev_pp = &np->properties; | |
223 | **allnextpp = np; | |
224 | *allnextpp = &np->allnext; | |
225 | if (dad != NULL) { | |
226 | np->parent = dad; | |
227 | /* we temporarily use the next field as `last_child'*/ | |
228 | if (dad->next == NULL) | |
229 | dad->child = np; | |
230 | else | |
231 | dad->next->sibling = np; | |
232 | dad->next = np; | |
233 | } | |
234 | kref_init(&np->kref); | |
235 | } | |
a7006c97 | 236 | /* process properties */ |
bbd33931 GL |
237 | while (1) { |
238 | u32 sz, noff; | |
239 | char *pname; | |
240 | ||
33714881 | 241 | tag = be32_to_cpup((__be32 *)(*p)); |
bbd33931 GL |
242 | if (tag == OF_DT_NOP) { |
243 | *p += 4; | |
244 | continue; | |
245 | } | |
246 | if (tag != OF_DT_PROP) | |
247 | break; | |
248 | *p += 4; | |
33714881 JK |
249 | sz = be32_to_cpup((__be32 *)(*p)); |
250 | noff = be32_to_cpup((__be32 *)((*p) + 4)); | |
bbd33931 | 251 | *p += 8; |
a40d6c4c | 252 | if (be32_to_cpu(blob->version) < 0x10) |
f1d4c3a7 | 253 | *p = ALIGN(*p, sz >= 8 ? 8 : 4); |
bbd33931 | 254 | |
a40d6c4c | 255 | pname = of_fdt_get_string(blob, noff); |
bbd33931 GL |
256 | if (pname == NULL) { |
257 | pr_info("Can't find property name in list !\n"); | |
258 | break; | |
259 | } | |
260 | if (strcmp(pname, "name") == 0) | |
261 | has_name = 1; | |
262 | l = strlen(pname) + 1; | |
263 | pp = unflatten_dt_alloc(&mem, sizeof(struct property), | |
264 | __alignof__(struct property)); | |
265 | if (allnextpp) { | |
04b954a6 DG |
266 | /* We accept flattened tree phandles either in |
267 | * ePAPR-style "phandle" properties, or the | |
268 | * legacy "linux,phandle" properties. If both | |
269 | * appear and have different values, things | |
270 | * will get weird. Don't do that. */ | |
271 | if ((strcmp(pname, "phandle") == 0) || | |
272 | (strcmp(pname, "linux,phandle") == 0)) { | |
6016a363 | 273 | if (np->phandle == 0) |
9a6b2e58 | 274 | np->phandle = be32_to_cpup((__be32*)*p); |
bbd33931 | 275 | } |
04b954a6 DG |
276 | /* And we process the "ibm,phandle" property |
277 | * used in pSeries dynamic device tree | |
278 | * stuff */ | |
bbd33931 | 279 | if (strcmp(pname, "ibm,phandle") == 0) |
9a6b2e58 | 280 | np->phandle = be32_to_cpup((__be32 *)*p); |
bbd33931 GL |
281 | pp->name = pname; |
282 | pp->length = sz; | |
283 | pp->value = (void *)*p; | |
284 | *prev_pp = pp; | |
285 | prev_pp = &pp->next; | |
286 | } | |
f1d4c3a7 | 287 | *p = ALIGN((*p) + sz, 4); |
bbd33931 GL |
288 | } |
289 | /* with version 0x10 we may not have the name property, recreate | |
290 | * it here from the unit name if absent | |
291 | */ | |
292 | if (!has_name) { | |
293 | char *p1 = pathp, *ps = pathp, *pa = NULL; | |
294 | int sz; | |
295 | ||
296 | while (*p1) { | |
297 | if ((*p1) == '@') | |
298 | pa = p1; | |
299 | if ((*p1) == '/') | |
300 | ps = p1 + 1; | |
301 | p1++; | |
302 | } | |
303 | if (pa < ps) | |
304 | pa = p1; | |
305 | sz = (pa - ps) + 1; | |
306 | pp = unflatten_dt_alloc(&mem, sizeof(struct property) + sz, | |
307 | __alignof__(struct property)); | |
308 | if (allnextpp) { | |
309 | pp->name = "name"; | |
310 | pp->length = sz; | |
311 | pp->value = pp + 1; | |
312 | *prev_pp = pp; | |
313 | prev_pp = &pp->next; | |
314 | memcpy(pp->value, ps, sz - 1); | |
315 | ((char *)pp->value)[sz - 1] = 0; | |
316 | pr_debug("fixed up name for %s -> %s\n", pathp, | |
317 | (char *)pp->value); | |
318 | } | |
319 | } | |
320 | if (allnextpp) { | |
321 | *prev_pp = NULL; | |
322 | np->name = of_get_property(np, "name", NULL); | |
323 | np->type = of_get_property(np, "device_type", NULL); | |
324 | ||
325 | if (!np->name) | |
326 | np->name = "<NULL>"; | |
327 | if (!np->type) | |
328 | np->type = "<NULL>"; | |
329 | } | |
7f809e1f JG |
330 | while (tag == OF_DT_BEGIN_NODE || tag == OF_DT_NOP) { |
331 | if (tag == OF_DT_NOP) | |
332 | *p += 4; | |
333 | else | |
a40d6c4c SN |
334 | mem = unflatten_dt_node(blob, mem, p, np, allnextpp, |
335 | fpsize); | |
33714881 | 336 | tag = be32_to_cpup((__be32 *)(*p)); |
bbd33931 GL |
337 | } |
338 | if (tag != OF_DT_END_NODE) { | |
339 | pr_err("Weird tag at end of node: %x\n", tag); | |
340 | return mem; | |
341 | } | |
342 | *p += 4; | |
343 | return mem; | |
344 | } | |
41f88009 | 345 | |
fe140423 SN |
346 | /** |
347 | * __unflatten_device_tree - create tree of device_nodes from flat blob | |
348 | * | |
349 | * unflattens a device-tree, creating the | |
350 | * tree of struct device_node. It also fills the "name" and "type" | |
351 | * pointers of the nodes so the normal device-tree walking functions | |
352 | * can be used. | |
353 | * @blob: The blob to expand | |
354 | * @mynodes: The device_node tree created by the call | |
355 | * @dt_alloc: An allocator that provides a virtual address to memory | |
356 | * for the resulting tree | |
357 | */ | |
a7006c97 | 358 | static void __unflatten_device_tree(struct boot_param_header *blob, |
fe140423 SN |
359 | struct device_node **mynodes, |
360 | void * (*dt_alloc)(u64 size, u64 align)) | |
361 | { | |
362 | unsigned long start, mem, size; | |
363 | struct device_node **allnextp = mynodes; | |
364 | ||
365 | pr_debug(" -> unflatten_device_tree()\n"); | |
366 | ||
367 | if (!blob) { | |
368 | pr_debug("No device tree pointer\n"); | |
369 | return; | |
370 | } | |
371 | ||
372 | pr_debug("Unflattening device tree:\n"); | |
373 | pr_debug("magic: %08x\n", be32_to_cpu(blob->magic)); | |
374 | pr_debug("size: %08x\n", be32_to_cpu(blob->totalsize)); | |
375 | pr_debug("version: %08x\n", be32_to_cpu(blob->version)); | |
376 | ||
377 | if (be32_to_cpu(blob->magic) != OF_DT_HEADER) { | |
378 | pr_err("Invalid device tree blob header\n"); | |
379 | return; | |
380 | } | |
381 | ||
382 | /* First pass, scan for size */ | |
383 | start = ((unsigned long)blob) + | |
384 | be32_to_cpu(blob->off_dt_struct); | |
385 | size = unflatten_dt_node(blob, 0, &start, NULL, NULL, 0); | |
386 | size = (size | 3) + 1; | |
387 | ||
388 | pr_debug(" size is %lx, allocating...\n", size); | |
389 | ||
390 | /* Allocate memory for the expanded device tree */ | |
391 | mem = (unsigned long) | |
392 | dt_alloc(size + 4, __alignof__(struct device_node)); | |
393 | ||
394 | ((__be32 *)mem)[size / 4] = cpu_to_be32(0xdeadbeef); | |
395 | ||
396 | pr_debug(" unflattening %lx...\n", mem); | |
397 | ||
398 | /* Second pass, do actual unflattening */ | |
399 | start = ((unsigned long)blob) + | |
400 | be32_to_cpu(blob->off_dt_struct); | |
401 | unflatten_dt_node(blob, mem, &start, NULL, &allnextp, 0); | |
402 | if (be32_to_cpup((__be32 *)start) != OF_DT_END) | |
403 | pr_warning("Weird tag at end of tree: %08x\n", *((u32 *)start)); | |
404 | if (be32_to_cpu(((__be32 *)mem)[size / 4]) != 0xdeadbeef) | |
405 | pr_warning("End of tree marker overwritten: %08x\n", | |
406 | be32_to_cpu(((__be32 *)mem)[size / 4])); | |
407 | *allnextp = NULL; | |
408 | ||
409 | pr_debug(" <- unflatten_device_tree()\n"); | |
410 | } | |
411 | ||
412 | static void *kernel_tree_alloc(u64 size, u64 align) | |
413 | { | |
414 | return kzalloc(size, GFP_KERNEL); | |
415 | } | |
416 | ||
417 | /** | |
418 | * of_fdt_unflatten_tree - create tree of device_nodes from flat blob | |
419 | * | |
420 | * unflattens the device-tree passed by the firmware, creating the | |
421 | * tree of struct device_node. It also fills the "name" and "type" | |
422 | * pointers of the nodes so the normal device-tree walking functions | |
423 | * can be used. | |
424 | */ | |
425 | void of_fdt_unflatten_tree(unsigned long *blob, | |
426 | struct device_node **mynodes) | |
427 | { | |
428 | struct boot_param_header *device_tree = | |
429 | (struct boot_param_header *)blob; | |
430 | __unflatten_device_tree(device_tree, mynodes, &kernel_tree_alloc); | |
431 | } | |
432 | EXPORT_SYMBOL_GPL(of_fdt_unflatten_tree); | |
433 | ||
57d00ecf SN |
434 | /* Everything below here references initial_boot_params directly. */ |
435 | int __initdata dt_root_addr_cells; | |
436 | int __initdata dt_root_size_cells; | |
437 | ||
438 | struct boot_param_header *initial_boot_params; | |
439 | ||
440 | #ifdef CONFIG_OF_EARLY_FLATTREE | |
441 | ||
442 | /** | |
443 | * of_scan_flat_dt - scan flattened tree blob and call callback on each. | |
444 | * @it: callback function | |
445 | * @data: context data pointer | |
446 | * | |
447 | * This function is used to scan the flattened device-tree, it is | |
448 | * used to extract the memory information at boot before we can | |
449 | * unflatten the tree | |
450 | */ | |
451 | int __init of_scan_flat_dt(int (*it)(unsigned long node, | |
452 | const char *uname, int depth, | |
453 | void *data), | |
454 | void *data) | |
455 | { | |
456 | unsigned long p = ((unsigned long)initial_boot_params) + | |
457 | be32_to_cpu(initial_boot_params->off_dt_struct); | |
458 | int rc = 0; | |
459 | int depth = -1; | |
460 | ||
461 | do { | |
462 | u32 tag = be32_to_cpup((__be32 *)p); | |
463 | char *pathp; | |
464 | ||
465 | p += 4; | |
466 | if (tag == OF_DT_END_NODE) { | |
467 | depth--; | |
468 | continue; | |
469 | } | |
470 | if (tag == OF_DT_NOP) | |
471 | continue; | |
472 | if (tag == OF_DT_END) | |
473 | break; | |
474 | if (tag == OF_DT_PROP) { | |
475 | u32 sz = be32_to_cpup((__be32 *)p); | |
476 | p += 8; | |
477 | if (be32_to_cpu(initial_boot_params->version) < 0x10) | |
478 | p = ALIGN(p, sz >= 8 ? 8 : 4); | |
479 | p += sz; | |
480 | p = ALIGN(p, 4); | |
481 | continue; | |
482 | } | |
483 | if (tag != OF_DT_BEGIN_NODE) { | |
484 | pr_err("Invalid tag %x in flat device tree!\n", tag); | |
485 | return -EINVAL; | |
486 | } | |
487 | depth++; | |
488 | pathp = (char *)p; | |
489 | p = ALIGN(p + strlen(pathp) + 1, 4); | |
490 | if ((*pathp) == '/') { | |
491 | char *lp, *np; | |
492 | for (lp = NULL, np = pathp; *np; np++) | |
493 | if ((*np) == '/') | |
494 | lp = np+1; | |
495 | if (lp != NULL) | |
496 | pathp = lp; | |
497 | } | |
498 | rc = it(p, pathp, depth, data); | |
499 | if (rc != 0) | |
500 | break; | |
501 | } while (1); | |
502 | ||
503 | return rc; | |
504 | } | |
505 | ||
506 | /** | |
507 | * of_get_flat_dt_root - find the root node in the flat blob | |
508 | */ | |
509 | unsigned long __init of_get_flat_dt_root(void) | |
510 | { | |
511 | unsigned long p = ((unsigned long)initial_boot_params) + | |
512 | be32_to_cpu(initial_boot_params->off_dt_struct); | |
513 | ||
514 | while (be32_to_cpup((__be32 *)p) == OF_DT_NOP) | |
515 | p += 4; | |
516 | BUG_ON(be32_to_cpup((__be32 *)p) != OF_DT_BEGIN_NODE); | |
517 | p += 4; | |
518 | return ALIGN(p + strlen((char *)p) + 1, 4); | |
519 | } | |
520 | ||
521 | /** | |
522 | * of_get_flat_dt_prop - Given a node in the flat blob, return the property ptr | |
523 | * | |
524 | * This function can be used within scan_flattened_dt callback to get | |
525 | * access to properties | |
526 | */ | |
527 | void *__init of_get_flat_dt_prop(unsigned long node, const char *name, | |
528 | unsigned long *size) | |
529 | { | |
530 | return of_fdt_get_property(initial_boot_params, node, name, size); | |
531 | } | |
532 | ||
533 | /** | |
534 | * of_flat_dt_is_compatible - Return true if given node has compat in compatible list | |
535 | * @node: node to test | |
536 | * @compat: compatible string to compare with compatible list. | |
537 | */ | |
538 | int __init of_flat_dt_is_compatible(unsigned long node, const char *compat) | |
539 | { | |
540 | return of_fdt_is_compatible(initial_boot_params, node, compat); | |
541 | } | |
542 | ||
a4f740cf GL |
543 | /** |
544 | * of_flat_dt_match - Return true if node matches a list of compatible values | |
545 | */ | |
7b482c83 | 546 | int __init of_flat_dt_match(unsigned long node, const char *const *compat) |
a4f740cf GL |
547 | { |
548 | return of_fdt_match(initial_boot_params, node, compat); | |
549 | } | |
550 | ||
f7b3a835 GL |
551 | #ifdef CONFIG_BLK_DEV_INITRD |
552 | /** | |
553 | * early_init_dt_check_for_initrd - Decode initrd location from flat tree | |
554 | * @node: reference to node containing initrd location ('chosen') | |
555 | */ | |
556 | void __init early_init_dt_check_for_initrd(unsigned long node) | |
557 | { | |
1406bc2f | 558 | unsigned long start, end, len; |
33714881 | 559 | __be32 *prop; |
f7b3a835 GL |
560 | |
561 | pr_debug("Looking for initrd properties... "); | |
562 | ||
563 | prop = of_get_flat_dt_prop(node, "linux,initrd-start", &len); | |
1406bc2f JK |
564 | if (!prop) |
565 | return; | |
566 | start = of_read_ulong(prop, len/4); | |
567 | ||
568 | prop = of_get_flat_dt_prop(node, "linux,initrd-end", &len); | |
569 | if (!prop) | |
570 | return; | |
571 | end = of_read_ulong(prop, len/4); | |
f7b3a835 | 572 | |
1406bc2f JK |
573 | early_init_dt_setup_initrd_arch(start, end); |
574 | pr_debug("initrd_start=0x%lx initrd_end=0x%lx\n", start, end); | |
f7b3a835 GL |
575 | } |
576 | #else | |
577 | inline void early_init_dt_check_for_initrd(unsigned long node) | |
578 | { | |
579 | } | |
580 | #endif /* CONFIG_BLK_DEV_INITRD */ | |
581 | ||
f00abd94 GL |
582 | /** |
583 | * early_init_dt_scan_root - fetch the top level address and size cells | |
584 | */ | |
585 | int __init early_init_dt_scan_root(unsigned long node, const char *uname, | |
586 | int depth, void *data) | |
587 | { | |
33714881 | 588 | __be32 *prop; |
f00abd94 GL |
589 | |
590 | if (depth != 0) | |
591 | return 0; | |
592 | ||
33714881 JK |
593 | dt_root_size_cells = OF_ROOT_NODE_SIZE_CELLS_DEFAULT; |
594 | dt_root_addr_cells = OF_ROOT_NODE_ADDR_CELLS_DEFAULT; | |
595 | ||
f00abd94 | 596 | prop = of_get_flat_dt_prop(node, "#size-cells", NULL); |
33714881 JK |
597 | if (prop) |
598 | dt_root_size_cells = be32_to_cpup(prop); | |
f00abd94 GL |
599 | pr_debug("dt_root_size_cells = %x\n", dt_root_size_cells); |
600 | ||
601 | prop = of_get_flat_dt_prop(node, "#address-cells", NULL); | |
33714881 JK |
602 | if (prop) |
603 | dt_root_addr_cells = be32_to_cpup(prop); | |
f00abd94 GL |
604 | pr_debug("dt_root_addr_cells = %x\n", dt_root_addr_cells); |
605 | ||
606 | /* break now */ | |
607 | return 1; | |
608 | } | |
609 | ||
2e89e685 | 610 | u64 __init dt_mem_next_cell(int s, __be32 **cellp) |
83f7a06e | 611 | { |
2e89e685 | 612 | __be32 *p = *cellp; |
83f7a06e GL |
613 | |
614 | *cellp = p + s; | |
615 | return of_read_number(p, s); | |
616 | } | |
617 | ||
51975db0 GL |
618 | /** |
619 | * early_init_dt_scan_memory - Look for an parse memory nodes | |
620 | */ | |
621 | int __init early_init_dt_scan_memory(unsigned long node, const char *uname, | |
622 | int depth, void *data) | |
623 | { | |
624 | char *type = of_get_flat_dt_prop(node, "device_type", NULL); | |
625 | __be32 *reg, *endp; | |
626 | unsigned long l; | |
627 | ||
628 | /* We are scanning "memory" nodes only */ | |
629 | if (type == NULL) { | |
630 | /* | |
631 | * The longtrail doesn't have a device_type on the | |
632 | * /memory node, so look for the node called /memory@0. | |
633 | */ | |
634 | if (depth != 1 || strcmp(uname, "memory@0") != 0) | |
635 | return 0; | |
636 | } else if (strcmp(type, "memory") != 0) | |
637 | return 0; | |
638 | ||
639 | reg = of_get_flat_dt_prop(node, "linux,usable-memory", &l); | |
640 | if (reg == NULL) | |
641 | reg = of_get_flat_dt_prop(node, "reg", &l); | |
642 | if (reg == NULL) | |
643 | return 0; | |
644 | ||
645 | endp = reg + (l / sizeof(__be32)); | |
646 | ||
647 | pr_debug("memory scan node %s, reg size %ld, data: %x %x %x %x,\n", | |
648 | uname, l, reg[0], reg[1], reg[2], reg[3]); | |
649 | ||
650 | while ((endp - reg) >= (dt_root_addr_cells + dt_root_size_cells)) { | |
651 | u64 base, size; | |
652 | ||
653 | base = dt_mem_next_cell(dt_root_addr_cells, ®); | |
654 | size = dt_mem_next_cell(dt_root_size_cells, ®); | |
655 | ||
656 | if (size == 0) | |
657 | continue; | |
658 | pr_debug(" - %llx , %llx\n", (unsigned long long)base, | |
659 | (unsigned long long)size); | |
660 | ||
661 | early_init_dt_add_memory_arch(base, size); | |
662 | } | |
663 | ||
664 | return 0; | |
665 | } | |
666 | ||
86e03221 GL |
667 | int __init early_init_dt_scan_chosen(unsigned long node, const char *uname, |
668 | int depth, void *data) | |
669 | { | |
670 | unsigned long l; | |
671 | char *p; | |
672 | ||
673 | pr_debug("search \"chosen\", depth: %d, uname: %s\n", depth, uname); | |
674 | ||
85f60ae4 | 675 | if (depth != 1 || !data || |
86e03221 GL |
676 | (strcmp(uname, "chosen") != 0 && strcmp(uname, "chosen@0") != 0)) |
677 | return 0; | |
678 | ||
679 | early_init_dt_check_for_initrd(node); | |
680 | ||
25985edc | 681 | /* Retrieve command line */ |
86e03221 GL |
682 | p = of_get_flat_dt_prop(node, "bootargs", &l); |
683 | if (p != NULL && l > 0) | |
85f60ae4 | 684 | strlcpy(data, p, min((int)l, COMMAND_LINE_SIZE)); |
86e03221 | 685 | |
78b782cb BH |
686 | /* |
687 | * CONFIG_CMDLINE is meant to be a default in case nothing else | |
688 | * managed to set the command line, unless CONFIG_CMDLINE_FORCE | |
689 | * is set in which case we override whatever was found earlier. | |
690 | */ | |
86e03221 GL |
691 | #ifdef CONFIG_CMDLINE |
692 | #ifndef CONFIG_CMDLINE_FORCE | |
78b782cb | 693 | if (!((char *)data)[0]) |
86e03221 | 694 | #endif |
85f60ae4 | 695 | strlcpy(data, CONFIG_CMDLINE, COMMAND_LINE_SIZE); |
86e03221 GL |
696 | #endif /* CONFIG_CMDLINE */ |
697 | ||
85f60ae4 | 698 | pr_debug("Command line is: %s\n", (char*)data); |
86e03221 GL |
699 | |
700 | /* break now */ | |
701 | return 1; | |
702 | } | |
703 | ||
41f88009 GL |
704 | /** |
705 | * unflatten_device_tree - create tree of device_nodes from flat blob | |
706 | * | |
707 | * unflattens the device-tree passed by the firmware, creating the | |
708 | * tree of struct device_node. It also fills the "name" and "type" | |
709 | * pointers of the nodes so the normal device-tree walking functions | |
710 | * can be used. | |
711 | */ | |
712 | void __init unflatten_device_tree(void) | |
713 | { | |
fe140423 | 714 | __unflatten_device_tree(initial_boot_params, &allnodes, |
672c5446 | 715 | early_init_dt_alloc_memory_arch); |
41f88009 | 716 | |
611cad72 SG |
717 | /* Get pointer to "/chosen" and "/aliasas" nodes for use everywhere */ |
718 | of_alias_scan(early_init_dt_alloc_memory_arch); | |
41f88009 | 719 | } |
e6ce1324 SN |
720 | |
721 | #endif /* CONFIG_OF_EARLY_FLATTREE */ |