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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> |
a1727da5 | 14 | #include <linux/memblock.h> |
fe140423 | 15 | #include <linux/module.h> |
e169cfbe GL |
16 | #include <linux/of.h> |
17 | #include <linux/of_fdt.h> | |
4ef7b373 JK |
18 | #include <linux/string.h> |
19 | #include <linux/errno.h> | |
fe140423 | 20 | #include <linux/slab.h> |
51975db0 | 21 | |
c89810ac | 22 | #include <asm/setup.h> /* for COMMAND_LINE_SIZE */ |
86e03221 GL |
23 | #ifdef CONFIG_PPC |
24 | #include <asm/machdep.h> | |
25 | #endif /* CONFIG_PPC */ | |
26 | ||
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 | ||
44856819 | 129 | static void *unflatten_dt_alloc(void **mem, unsigned long size, |
bbd33931 GL |
130 | unsigned long align) |
131 | { | |
132 | void *res; | |
133 | ||
44856819 GL |
134 | *mem = PTR_ALIGN(*mem, align); |
135 | res = *mem; | |
bbd33931 GL |
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 | */ | |
44856819 GL |
150 | static void * unflatten_dt_node(struct boot_param_header *blob, |
151 | void *mem, | |
152 | void **p, | |
a40d6c4c SN |
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 | ||
44856819 | 165 | tag = be32_to_cpup(*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; | |
44856819 | 171 | pathp = *p; |
bbd33931 | 172 | l = allocl = strlen(pathp) + 1; |
44856819 | 173 | *p = PTR_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; | |
0fca5dea CM |
190 | l = 1; |
191 | *pathp = '\0'; | |
bbd33931 GL |
192 | } else { |
193 | /* account for '/' and path size minus terminal 0 | |
194 | * already in 'l' | |
195 | */ | |
196 | fpsize += l; | |
197 | allocl = fpsize; | |
198 | } | |
199 | } | |
200 | ||
201 | np = unflatten_dt_alloc(&mem, sizeof(struct device_node) + allocl, | |
202 | __alignof__(struct device_node)); | |
203 | if (allnextpp) { | |
c22618a1 | 204 | char *fn; |
c22618a1 | 205 | np->full_name = fn = ((char *)np) + sizeof(*np); |
bbd33931 | 206 | if (new_format) { |
bbd33931 GL |
207 | /* rebuild full path for new format */ |
208 | if (dad && dad->parent) { | |
209 | strcpy(fn, dad->full_name); | |
210 | #ifdef DEBUG | |
211 | if ((strlen(fn) + l + 1) != allocl) { | |
212 | pr_debug("%s: p: %d, l: %d, a: %d\n", | |
213 | pathp, (int)strlen(fn), | |
214 | l, allocl); | |
215 | } | |
216 | #endif | |
217 | fn += strlen(fn); | |
218 | } | |
219 | *(fn++) = '/'; | |
c22618a1 GL |
220 | } |
221 | memcpy(fn, pathp, l); | |
222 | ||
bbd33931 GL |
223 | prev_pp = &np->properties; |
224 | **allnextpp = np; | |
225 | *allnextpp = &np->allnext; | |
226 | if (dad != NULL) { | |
227 | np->parent = dad; | |
228 | /* we temporarily use the next field as `last_child'*/ | |
229 | if (dad->next == NULL) | |
230 | dad->child = np; | |
231 | else | |
232 | dad->next->sibling = np; | |
233 | dad->next = np; | |
234 | } | |
235 | kref_init(&np->kref); | |
236 | } | |
a7006c97 | 237 | /* process properties */ |
bbd33931 GL |
238 | while (1) { |
239 | u32 sz, noff; | |
240 | char *pname; | |
241 | ||
44856819 | 242 | tag = be32_to_cpup(*p); |
bbd33931 GL |
243 | if (tag == OF_DT_NOP) { |
244 | *p += 4; | |
245 | continue; | |
246 | } | |
247 | if (tag != OF_DT_PROP) | |
248 | break; | |
249 | *p += 4; | |
44856819 GL |
250 | sz = be32_to_cpup(*p); |
251 | noff = be32_to_cpup(*p + 4); | |
bbd33931 | 252 | *p += 8; |
a40d6c4c | 253 | if (be32_to_cpu(blob->version) < 0x10) |
44856819 | 254 | *p = PTR_ALIGN(*p, sz >= 8 ? 8 : 4); |
bbd33931 | 255 | |
a40d6c4c | 256 | pname = of_fdt_get_string(blob, noff); |
bbd33931 GL |
257 | if (pname == NULL) { |
258 | pr_info("Can't find property name in list !\n"); | |
259 | break; | |
260 | } | |
261 | if (strcmp(pname, "name") == 0) | |
262 | has_name = 1; | |
263 | l = strlen(pname) + 1; | |
264 | pp = unflatten_dt_alloc(&mem, sizeof(struct property), | |
265 | __alignof__(struct property)); | |
266 | if (allnextpp) { | |
04b954a6 DG |
267 | /* We accept flattened tree phandles either in |
268 | * ePAPR-style "phandle" properties, or the | |
269 | * legacy "linux,phandle" properties. If both | |
270 | * appear and have different values, things | |
271 | * will get weird. Don't do that. */ | |
272 | if ((strcmp(pname, "phandle") == 0) || | |
273 | (strcmp(pname, "linux,phandle") == 0)) { | |
6016a363 | 274 | if (np->phandle == 0) |
9a6b2e58 | 275 | np->phandle = be32_to_cpup((__be32*)*p); |
bbd33931 | 276 | } |
04b954a6 DG |
277 | /* And we process the "ibm,phandle" property |
278 | * used in pSeries dynamic device tree | |
279 | * stuff */ | |
bbd33931 | 280 | if (strcmp(pname, "ibm,phandle") == 0) |
9a6b2e58 | 281 | np->phandle = be32_to_cpup((__be32 *)*p); |
bbd33931 GL |
282 | pp->name = pname; |
283 | pp->length = sz; | |
44856819 | 284 | pp->value = *p; |
bbd33931 GL |
285 | *prev_pp = pp; |
286 | prev_pp = &pp->next; | |
287 | } | |
44856819 | 288 | *p = PTR_ALIGN((*p) + sz, 4); |
bbd33931 GL |
289 | } |
290 | /* with version 0x10 we may not have the name property, recreate | |
291 | * it here from the unit name if absent | |
292 | */ | |
293 | if (!has_name) { | |
294 | char *p1 = pathp, *ps = pathp, *pa = NULL; | |
295 | int sz; | |
296 | ||
297 | while (*p1) { | |
298 | if ((*p1) == '@') | |
299 | pa = p1; | |
300 | if ((*p1) == '/') | |
301 | ps = p1 + 1; | |
302 | p1++; | |
303 | } | |
304 | if (pa < ps) | |
305 | pa = p1; | |
306 | sz = (pa - ps) + 1; | |
307 | pp = unflatten_dt_alloc(&mem, sizeof(struct property) + sz, | |
308 | __alignof__(struct property)); | |
309 | if (allnextpp) { | |
310 | pp->name = "name"; | |
311 | pp->length = sz; | |
312 | pp->value = pp + 1; | |
313 | *prev_pp = pp; | |
314 | prev_pp = &pp->next; | |
315 | memcpy(pp->value, ps, sz - 1); | |
316 | ((char *)pp->value)[sz - 1] = 0; | |
317 | pr_debug("fixed up name for %s -> %s\n", pathp, | |
318 | (char *)pp->value); | |
319 | } | |
320 | } | |
321 | if (allnextpp) { | |
322 | *prev_pp = NULL; | |
323 | np->name = of_get_property(np, "name", NULL); | |
324 | np->type = of_get_property(np, "device_type", NULL); | |
325 | ||
326 | if (!np->name) | |
327 | np->name = "<NULL>"; | |
328 | if (!np->type) | |
329 | np->type = "<NULL>"; | |
330 | } | |
7f809e1f JG |
331 | while (tag == OF_DT_BEGIN_NODE || tag == OF_DT_NOP) { |
332 | if (tag == OF_DT_NOP) | |
333 | *p += 4; | |
334 | else | |
a40d6c4c SN |
335 | mem = unflatten_dt_node(blob, mem, p, np, allnextpp, |
336 | fpsize); | |
44856819 | 337 | tag = be32_to_cpup(*p); |
bbd33931 GL |
338 | } |
339 | if (tag != OF_DT_END_NODE) { | |
340 | pr_err("Weird tag at end of node: %x\n", tag); | |
341 | return mem; | |
342 | } | |
343 | *p += 4; | |
344 | return mem; | |
345 | } | |
41f88009 | 346 | |
fe140423 SN |
347 | /** |
348 | * __unflatten_device_tree - create tree of device_nodes from flat blob | |
349 | * | |
350 | * unflattens a device-tree, creating the | |
351 | * tree of struct device_node. It also fills the "name" and "type" | |
352 | * pointers of the nodes so the normal device-tree walking functions | |
353 | * can be used. | |
354 | * @blob: The blob to expand | |
355 | * @mynodes: The device_node tree created by the call | |
356 | * @dt_alloc: An allocator that provides a virtual address to memory | |
357 | * for the resulting tree | |
358 | */ | |
a7006c97 | 359 | static void __unflatten_device_tree(struct boot_param_header *blob, |
fe140423 SN |
360 | struct device_node **mynodes, |
361 | void * (*dt_alloc)(u64 size, u64 align)) | |
362 | { | |
44856819 GL |
363 | unsigned long size; |
364 | void *start, *mem; | |
fe140423 SN |
365 | struct device_node **allnextp = mynodes; |
366 | ||
367 | pr_debug(" -> unflatten_device_tree()\n"); | |
368 | ||
369 | if (!blob) { | |
370 | pr_debug("No device tree pointer\n"); | |
371 | return; | |
372 | } | |
373 | ||
374 | pr_debug("Unflattening device tree:\n"); | |
375 | pr_debug("magic: %08x\n", be32_to_cpu(blob->magic)); | |
376 | pr_debug("size: %08x\n", be32_to_cpu(blob->totalsize)); | |
377 | pr_debug("version: %08x\n", be32_to_cpu(blob->version)); | |
378 | ||
379 | if (be32_to_cpu(blob->magic) != OF_DT_HEADER) { | |
380 | pr_err("Invalid device tree blob header\n"); | |
381 | return; | |
382 | } | |
383 | ||
384 | /* First pass, scan for size */ | |
44856819 GL |
385 | start = ((void *)blob) + be32_to_cpu(blob->off_dt_struct); |
386 | size = (unsigned long)unflatten_dt_node(blob, 0, &start, NULL, NULL, 0); | |
387 | size = ALIGN(size, 4); | |
fe140423 SN |
388 | |
389 | pr_debug(" size is %lx, allocating...\n", size); | |
390 | ||
391 | /* Allocate memory for the expanded device tree */ | |
44856819 GL |
392 | mem = dt_alloc(size + 4, __alignof__(struct device_node)); |
393 | memset(mem, 0, size); | |
fe140423 | 394 | |
44856819 | 395 | *(__be32 *)(mem + size) = cpu_to_be32(0xdeadbeef); |
9e401275 | 396 | |
44856819 | 397 | pr_debug(" unflattening %p...\n", mem); |
fe140423 SN |
398 | |
399 | /* Second pass, do actual unflattening */ | |
44856819 | 400 | start = ((void *)blob) + be32_to_cpu(blob->off_dt_struct); |
fe140423 | 401 | unflatten_dt_node(blob, mem, &start, NULL, &allnextp, 0); |
44856819 GL |
402 | if (be32_to_cpup(start) != OF_DT_END) |
403 | pr_warning("Weird tag at end of tree: %08x\n", be32_to_cpup(start)); | |
404 | if (be32_to_cpup(mem + size) != 0xdeadbeef) | |
fe140423 | 405 | pr_warning("End of tree marker overwritten: %08x\n", |
44856819 | 406 | be32_to_cpup(mem + size)); |
fe140423 SN |
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); | |
e55b0829 | 463 | const char *pathp; |
57d00ecf SN |
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); | |
375da3a7 AS |
490 | if (*pathp == '/') |
491 | pathp = kbasename(pathp); | |
57d00ecf SN |
492 | rc = it(p, pathp, depth, data); |
493 | if (rc != 0) | |
494 | break; | |
495 | } while (1); | |
496 | ||
497 | return rc; | |
498 | } | |
499 | ||
500 | /** | |
501 | * of_get_flat_dt_root - find the root node in the flat blob | |
502 | */ | |
503 | unsigned long __init of_get_flat_dt_root(void) | |
504 | { | |
505 | unsigned long p = ((unsigned long)initial_boot_params) + | |
506 | be32_to_cpu(initial_boot_params->off_dt_struct); | |
507 | ||
508 | while (be32_to_cpup((__be32 *)p) == OF_DT_NOP) | |
509 | p += 4; | |
510 | BUG_ON(be32_to_cpup((__be32 *)p) != OF_DT_BEGIN_NODE); | |
511 | p += 4; | |
512 | return ALIGN(p + strlen((char *)p) + 1, 4); | |
513 | } | |
514 | ||
515 | /** | |
516 | * of_get_flat_dt_prop - Given a node in the flat blob, return the property ptr | |
517 | * | |
518 | * This function can be used within scan_flattened_dt callback to get | |
519 | * access to properties | |
520 | */ | |
521 | void *__init of_get_flat_dt_prop(unsigned long node, const char *name, | |
522 | unsigned long *size) | |
523 | { | |
524 | return of_fdt_get_property(initial_boot_params, node, name, size); | |
525 | } | |
526 | ||
527 | /** | |
528 | * of_flat_dt_is_compatible - Return true if given node has compat in compatible list | |
529 | * @node: node to test | |
530 | * @compat: compatible string to compare with compatible list. | |
531 | */ | |
532 | int __init of_flat_dt_is_compatible(unsigned long node, const char *compat) | |
533 | { | |
534 | return of_fdt_is_compatible(initial_boot_params, node, compat); | |
535 | } | |
536 | ||
a4f740cf GL |
537 | /** |
538 | * of_flat_dt_match - Return true if node matches a list of compatible values | |
539 | */ | |
7b482c83 | 540 | int __init of_flat_dt_match(unsigned long node, const char *const *compat) |
a4f740cf GL |
541 | { |
542 | return of_fdt_match(initial_boot_params, node, compat); | |
543 | } | |
544 | ||
57d74bcf MS |
545 | struct fdt_scan_status { |
546 | const char *name; | |
547 | int namelen; | |
548 | int depth; | |
549 | int found; | |
550 | int (*iterator)(unsigned long node, const char *uname, int depth, void *data); | |
551 | void *data; | |
552 | }; | |
553 | ||
554 | /** | |
555 | * fdt_scan_node_by_path - iterator for of_scan_flat_dt_by_path function | |
556 | */ | |
557 | static int __init fdt_scan_node_by_path(unsigned long node, const char *uname, | |
558 | int depth, void *data) | |
559 | { | |
560 | struct fdt_scan_status *st = data; | |
561 | ||
562 | /* | |
563 | * if scan at the requested fdt node has been completed, | |
564 | * return -ENXIO to abort further scanning | |
565 | */ | |
566 | if (depth <= st->depth) | |
567 | return -ENXIO; | |
568 | ||
569 | /* requested fdt node has been found, so call iterator function */ | |
570 | if (st->found) | |
571 | return st->iterator(node, uname, depth, st->data); | |
572 | ||
573 | /* check if scanning automata is entering next level of fdt nodes */ | |
574 | if (depth == st->depth + 1 && | |
575 | strncmp(st->name, uname, st->namelen) == 0 && | |
576 | uname[st->namelen] == 0) { | |
577 | st->depth += 1; | |
578 | if (st->name[st->namelen] == 0) { | |
579 | st->found = 1; | |
580 | } else { | |
581 | const char *next = st->name + st->namelen + 1; | |
582 | st->name = next; | |
583 | st->namelen = strcspn(next, "/"); | |
584 | } | |
585 | return 0; | |
586 | } | |
587 | ||
588 | /* scan next fdt node */ | |
589 | return 0; | |
590 | } | |
591 | ||
592 | /** | |
593 | * of_scan_flat_dt_by_path - scan flattened tree blob and call callback on each | |
594 | * child of the given path. | |
595 | * @path: path to start searching for children | |
596 | * @it: callback function | |
597 | * @data: context data pointer | |
598 | * | |
599 | * This function is used to scan the flattened device-tree starting from the | |
600 | * node given by path. It is used to extract information (like reserved | |
601 | * memory), which is required on ealy boot before we can unflatten the tree. | |
602 | */ | |
603 | int __init of_scan_flat_dt_by_path(const char *path, | |
604 | int (*it)(unsigned long node, const char *name, int depth, void *data), | |
605 | void *data) | |
606 | { | |
607 | struct fdt_scan_status st = {path, 0, -1, 0, it, data}; | |
608 | int ret = 0; | |
609 | ||
610 | if (initial_boot_params) | |
611 | ret = of_scan_flat_dt(fdt_scan_node_by_path, &st); | |
612 | ||
613 | if (!st.found) | |
614 | return -ENOENT; | |
615 | else if (ret == -ENXIO) /* scan has been completed */ | |
616 | return 0; | |
617 | else | |
618 | return ret; | |
619 | } | |
620 | ||
6a903a25 RH |
621 | const char * __init of_flat_dt_get_machine_name(void) |
622 | { | |
623 | const char *name; | |
624 | unsigned long dt_root = of_get_flat_dt_root(); | |
625 | ||
626 | name = of_get_flat_dt_prop(dt_root, "model", NULL); | |
627 | if (!name) | |
628 | name = of_get_flat_dt_prop(dt_root, "compatible", NULL); | |
629 | return name; | |
630 | } | |
631 | ||
632 | /** | |
633 | * of_flat_dt_match_machine - Iterate match tables to find matching machine. | |
634 | * | |
635 | * @default_match: A machine specific ptr to return in case of no match. | |
636 | * @get_next_compat: callback function to return next compatible match table. | |
637 | * | |
638 | * Iterate through machine match tables to find the best match for the machine | |
639 | * compatible string in the FDT. | |
640 | */ | |
641 | const void * __init of_flat_dt_match_machine(const void *default_match, | |
642 | const void * (*get_next_compat)(const char * const**)) | |
643 | { | |
644 | const void *data = NULL; | |
645 | const void *best_data = default_match; | |
646 | const char *const *compat; | |
647 | unsigned long dt_root; | |
648 | unsigned int best_score = ~1, score = 0; | |
649 | ||
650 | dt_root = of_get_flat_dt_root(); | |
651 | while ((data = get_next_compat(&compat))) { | |
652 | score = of_flat_dt_match(dt_root, compat); | |
653 | if (score > 0 && score < best_score) { | |
654 | best_data = data; | |
655 | best_score = score; | |
656 | } | |
657 | } | |
658 | if (!best_data) { | |
659 | const char *prop; | |
660 | long size; | |
661 | ||
662 | pr_err("\n unrecognized device tree list:\n[ "); | |
663 | ||
664 | prop = of_get_flat_dt_prop(dt_root, "compatible", &size); | |
665 | if (prop) { | |
666 | while (size > 0) { | |
667 | printk("'%s' ", prop); | |
668 | size -= strlen(prop) + 1; | |
669 | prop += strlen(prop) + 1; | |
670 | } | |
671 | } | |
672 | printk("]\n\n"); | |
673 | return NULL; | |
674 | } | |
675 | ||
676 | pr_info("Machine model: %s\n", of_flat_dt_get_machine_name()); | |
677 | ||
678 | return best_data; | |
679 | } | |
680 | ||
f7b3a835 GL |
681 | #ifdef CONFIG_BLK_DEV_INITRD |
682 | /** | |
683 | * early_init_dt_check_for_initrd - Decode initrd location from flat tree | |
684 | * @node: reference to node containing initrd location ('chosen') | |
685 | */ | |
29eb45a9 | 686 | static void __init early_init_dt_check_for_initrd(unsigned long node) |
f7b3a835 | 687 | { |
374d5c99 SS |
688 | u64 start, end; |
689 | unsigned long len; | |
33714881 | 690 | __be32 *prop; |
f7b3a835 GL |
691 | |
692 | pr_debug("Looking for initrd properties... "); | |
693 | ||
694 | prop = of_get_flat_dt_prop(node, "linux,initrd-start", &len); | |
1406bc2f JK |
695 | if (!prop) |
696 | return; | |
374d5c99 | 697 | start = of_read_number(prop, len/4); |
1406bc2f JK |
698 | |
699 | prop = of_get_flat_dt_prop(node, "linux,initrd-end", &len); | |
700 | if (!prop) | |
701 | return; | |
374d5c99 | 702 | end = of_read_number(prop, len/4); |
f7b3a835 | 703 | |
29eb45a9 RH |
704 | initrd_start = (unsigned long)__va(start); |
705 | initrd_end = (unsigned long)__va(end); | |
706 | initrd_below_start_ok = 1; | |
707 | ||
374d5c99 SS |
708 | pr_debug("initrd_start=0x%llx initrd_end=0x%llx\n", |
709 | (unsigned long long)start, (unsigned long long)end); | |
f7b3a835 GL |
710 | } |
711 | #else | |
29eb45a9 | 712 | static inline void early_init_dt_check_for_initrd(unsigned long node) |
f7b3a835 GL |
713 | { |
714 | } | |
715 | #endif /* CONFIG_BLK_DEV_INITRD */ | |
716 | ||
f00abd94 GL |
717 | /** |
718 | * early_init_dt_scan_root - fetch the top level address and size cells | |
719 | */ | |
720 | int __init early_init_dt_scan_root(unsigned long node, const char *uname, | |
721 | int depth, void *data) | |
722 | { | |
33714881 | 723 | __be32 *prop; |
f00abd94 GL |
724 | |
725 | if (depth != 0) | |
726 | return 0; | |
727 | ||
33714881 JK |
728 | dt_root_size_cells = OF_ROOT_NODE_SIZE_CELLS_DEFAULT; |
729 | dt_root_addr_cells = OF_ROOT_NODE_ADDR_CELLS_DEFAULT; | |
730 | ||
f00abd94 | 731 | prop = of_get_flat_dt_prop(node, "#size-cells", NULL); |
33714881 JK |
732 | if (prop) |
733 | dt_root_size_cells = be32_to_cpup(prop); | |
f00abd94 GL |
734 | pr_debug("dt_root_size_cells = %x\n", dt_root_size_cells); |
735 | ||
736 | prop = of_get_flat_dt_prop(node, "#address-cells", NULL); | |
33714881 JK |
737 | if (prop) |
738 | dt_root_addr_cells = be32_to_cpup(prop); | |
f00abd94 GL |
739 | pr_debug("dt_root_addr_cells = %x\n", dt_root_addr_cells); |
740 | ||
741 | /* break now */ | |
742 | return 1; | |
743 | } | |
744 | ||
2e89e685 | 745 | u64 __init dt_mem_next_cell(int s, __be32 **cellp) |
83f7a06e | 746 | { |
2e89e685 | 747 | __be32 *p = *cellp; |
83f7a06e GL |
748 | |
749 | *cellp = p + s; | |
750 | return of_read_number(p, s); | |
751 | } | |
752 | ||
51975db0 GL |
753 | /** |
754 | * early_init_dt_scan_memory - Look for an parse memory nodes | |
755 | */ | |
756 | int __init early_init_dt_scan_memory(unsigned long node, const char *uname, | |
757 | int depth, void *data) | |
758 | { | |
759 | char *type = of_get_flat_dt_prop(node, "device_type", NULL); | |
760 | __be32 *reg, *endp; | |
761 | unsigned long l; | |
762 | ||
763 | /* We are scanning "memory" nodes only */ | |
764 | if (type == NULL) { | |
765 | /* | |
766 | * The longtrail doesn't have a device_type on the | |
767 | * /memory node, so look for the node called /memory@0. | |
768 | */ | |
769 | if (depth != 1 || strcmp(uname, "memory@0") != 0) | |
770 | return 0; | |
771 | } else if (strcmp(type, "memory") != 0) | |
772 | return 0; | |
773 | ||
774 | reg = of_get_flat_dt_prop(node, "linux,usable-memory", &l); | |
775 | if (reg == NULL) | |
776 | reg = of_get_flat_dt_prop(node, "reg", &l); | |
777 | if (reg == NULL) | |
778 | return 0; | |
779 | ||
780 | endp = reg + (l / sizeof(__be32)); | |
781 | ||
782 | pr_debug("memory scan node %s, reg size %ld, data: %x %x %x %x,\n", | |
783 | uname, l, reg[0], reg[1], reg[2], reg[3]); | |
784 | ||
785 | while ((endp - reg) >= (dt_root_addr_cells + dt_root_size_cells)) { | |
786 | u64 base, size; | |
787 | ||
788 | base = dt_mem_next_cell(dt_root_addr_cells, ®); | |
789 | size = dt_mem_next_cell(dt_root_size_cells, ®); | |
790 | ||
791 | if (size == 0) | |
792 | continue; | |
793 | pr_debug(" - %llx , %llx\n", (unsigned long long)base, | |
794 | (unsigned long long)size); | |
795 | ||
796 | early_init_dt_add_memory_arch(base, size); | |
797 | } | |
798 | ||
799 | return 0; | |
800 | } | |
801 | ||
86e03221 GL |
802 | int __init early_init_dt_scan_chosen(unsigned long node, const char *uname, |
803 | int depth, void *data) | |
804 | { | |
805 | unsigned long l; | |
806 | char *p; | |
807 | ||
808 | pr_debug("search \"chosen\", depth: %d, uname: %s\n", depth, uname); | |
809 | ||
85f60ae4 | 810 | if (depth != 1 || !data || |
86e03221 GL |
811 | (strcmp(uname, "chosen") != 0 && strcmp(uname, "chosen@0") != 0)) |
812 | return 0; | |
813 | ||
814 | early_init_dt_check_for_initrd(node); | |
815 | ||
25985edc | 816 | /* Retrieve command line */ |
86e03221 GL |
817 | p = of_get_flat_dt_prop(node, "bootargs", &l); |
818 | if (p != NULL && l > 0) | |
85f60ae4 | 819 | strlcpy(data, p, min((int)l, COMMAND_LINE_SIZE)); |
86e03221 | 820 | |
78b782cb BH |
821 | /* |
822 | * CONFIG_CMDLINE is meant to be a default in case nothing else | |
823 | * managed to set the command line, unless CONFIG_CMDLINE_FORCE | |
824 | * is set in which case we override whatever was found earlier. | |
825 | */ | |
86e03221 GL |
826 | #ifdef CONFIG_CMDLINE |
827 | #ifndef CONFIG_CMDLINE_FORCE | |
78b782cb | 828 | if (!((char *)data)[0]) |
86e03221 | 829 | #endif |
85f60ae4 | 830 | strlcpy(data, CONFIG_CMDLINE, COMMAND_LINE_SIZE); |
86e03221 GL |
831 | #endif /* CONFIG_CMDLINE */ |
832 | ||
85f60ae4 | 833 | pr_debug("Command line is: %s\n", (char*)data); |
86e03221 GL |
834 | |
835 | /* break now */ | |
836 | return 1; | |
837 | } | |
838 | ||
a1727da5 | 839 | #ifdef CONFIG_HAVE_MEMBLOCK |
068f6310 RH |
840 | void __init __weak early_init_dt_add_memory_arch(u64 base, u64 size) |
841 | { | |
842 | const u64 phys_offset = __pa(PAGE_OFFSET); | |
843 | base &= PAGE_MASK; | |
844 | size &= PAGE_MASK; | |
845 | if (base + size < phys_offset) { | |
846 | pr_warning("Ignoring memory block 0x%llx - 0x%llx\n", | |
847 | base, base + size); | |
848 | return; | |
849 | } | |
850 | if (base < phys_offset) { | |
851 | pr_warning("Ignoring memory range 0x%llx - 0x%llx\n", | |
852 | base, phys_offset); | |
853 | size -= phys_offset - base; | |
854 | base = phys_offset; | |
855 | } | |
856 | memblock_add(base, size); | |
857 | } | |
858 | ||
a1727da5 GL |
859 | /* |
860 | * called from unflatten_device_tree() to bootstrap devicetree itself | |
861 | * Architectures can override this definition if memblock isn't used | |
862 | */ | |
863 | void * __init __weak early_init_dt_alloc_memory_arch(u64 size, u64 align) | |
864 | { | |
865 | return __va(memblock_alloc(size, align)); | |
866 | } | |
867 | #endif | |
868 | ||
0288ffcb RH |
869 | bool __init early_init_dt_scan(void *params) |
870 | { | |
871 | if (!params) | |
872 | return false; | |
873 | ||
874 | /* Setup flat device-tree pointer */ | |
875 | initial_boot_params = params; | |
876 | ||
877 | /* check device tree validity */ | |
878 | if (be32_to_cpu(initial_boot_params->magic) != OF_DT_HEADER) { | |
879 | initial_boot_params = NULL; | |
880 | return false; | |
881 | } | |
882 | ||
883 | /* Retrieve various information from the /chosen node */ | |
884 | of_scan_flat_dt(early_init_dt_scan_chosen, boot_command_line); | |
885 | ||
886 | /* Initialize {size,address}-cells info */ | |
887 | of_scan_flat_dt(early_init_dt_scan_root, NULL); | |
888 | ||
889 | /* Setup memory, calling early_init_dt_add_memory_arch */ | |
890 | of_scan_flat_dt(early_init_dt_scan_memory, NULL); | |
891 | ||
892 | return true; | |
893 | } | |
894 | ||
41f88009 GL |
895 | /** |
896 | * unflatten_device_tree - create tree of device_nodes from flat blob | |
897 | * | |
898 | * unflattens the device-tree passed by the firmware, creating the | |
899 | * tree of struct device_node. It also fills the "name" and "type" | |
900 | * pointers of the nodes so the normal device-tree walking functions | |
901 | * can be used. | |
902 | */ | |
903 | void __init unflatten_device_tree(void) | |
904 | { | |
465aac6d | 905 | __unflatten_device_tree(initial_boot_params, &of_allnodes, |
672c5446 | 906 | early_init_dt_alloc_memory_arch); |
41f88009 | 907 | |
4c7d6361 | 908 | /* Get pointer to "/chosen" and "/aliases" nodes for use everywhere */ |
611cad72 | 909 | of_alias_scan(early_init_dt_alloc_memory_arch); |
41f88009 | 910 | } |
e6ce1324 | 911 | |
a8bf7527 RH |
912 | /** |
913 | * unflatten_and_copy_device_tree - copy and create tree of device_nodes from flat blob | |
914 | * | |
915 | * Copies and unflattens the device-tree passed by the firmware, creating the | |
916 | * tree of struct device_node. It also fills the "name" and "type" | |
917 | * pointers of the nodes so the normal device-tree walking functions | |
918 | * can be used. This should only be used when the FDT memory has not been | |
919 | * reserved such is the case when the FDT is built-in to the kernel init | |
920 | * section. If the FDT memory is reserved already then unflatten_device_tree | |
921 | * should be used instead. | |
922 | */ | |
923 | void __init unflatten_and_copy_device_tree(void) | |
924 | { | |
6f041e99 JH |
925 | int size; |
926 | void *dt; | |
927 | ||
928 | if (!initial_boot_params) { | |
929 | pr_warn("No valid device tree found, continuing without\n"); | |
930 | return; | |
931 | } | |
932 | ||
933 | size = __be32_to_cpu(initial_boot_params->totalsize); | |
934 | dt = early_init_dt_alloc_memory_arch(size, | |
a8bf7527 RH |
935 | __alignof__(struct boot_param_header)); |
936 | ||
937 | if (dt) { | |
938 | memcpy(dt, initial_boot_params, size); | |
939 | initial_boot_params = dt; | |
940 | } | |
941 | unflatten_device_tree(); | |
942 | } | |
943 | ||
e6ce1324 | 944 | #endif /* CONFIG_OF_EARLY_FLATTREE */ |