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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> |
a1727da5 | 14 | #include <linux/memblock.h> |
e169cfbe GL |
15 | #include <linux/of.h> |
16 | #include <linux/of_fdt.h> | |
3f0c8206 | 17 | #include <linux/of_reserved_mem.h> |
e8d9d1f5 | 18 | #include <linux/sizes.h> |
4ef7b373 JK |
19 | #include <linux/string.h> |
20 | #include <linux/errno.h> | |
fe140423 | 21 | #include <linux/slab.h> |
e6a6928c | 22 | #include <linux/libfdt.h> |
b0a6fb36 | 23 | #include <linux/debugfs.h> |
fb11ffe7 | 24 | #include <linux/serial_core.h> |
51975db0 | 25 | |
c89810ac | 26 | #include <asm/setup.h> /* for COMMAND_LINE_SIZE */ |
4ef7b373 JK |
27 | #include <asm/page.h> |
28 | ||
704033ce LA |
29 | /* |
30 | * of_fdt_limit_memory - limit the number of regions in the /memory node | |
31 | * @limit: maximum entries | |
32 | * | |
33 | * Adjust the flattened device tree to have at most 'limit' number of | |
34 | * memory entries in the /memory node. This function may be called | |
35 | * any time after initial_boot_param is set. | |
36 | */ | |
37 | void of_fdt_limit_memory(int limit) | |
38 | { | |
39 | int memory; | |
40 | int len; | |
41 | const void *val; | |
42 | int nr_address_cells = OF_ROOT_NODE_ADDR_CELLS_DEFAULT; | |
43 | int nr_size_cells = OF_ROOT_NODE_SIZE_CELLS_DEFAULT; | |
44 | const uint32_t *addr_prop; | |
45 | const uint32_t *size_prop; | |
46 | int root_offset; | |
47 | int cell_size; | |
48 | ||
49 | root_offset = fdt_path_offset(initial_boot_params, "/"); | |
50 | if (root_offset < 0) | |
51 | return; | |
52 | ||
53 | addr_prop = fdt_getprop(initial_boot_params, root_offset, | |
54 | "#address-cells", NULL); | |
55 | if (addr_prop) | |
56 | nr_address_cells = fdt32_to_cpu(*addr_prop); | |
57 | ||
58 | size_prop = fdt_getprop(initial_boot_params, root_offset, | |
59 | "#size-cells", NULL); | |
60 | if (size_prop) | |
61 | nr_size_cells = fdt32_to_cpu(*size_prop); | |
62 | ||
63 | cell_size = sizeof(uint32_t)*(nr_address_cells + nr_size_cells); | |
64 | ||
65 | memory = fdt_path_offset(initial_boot_params, "/memory"); | |
66 | if (memory > 0) { | |
67 | val = fdt_getprop(initial_boot_params, memory, "reg", &len); | |
68 | if (len > limit*cell_size) { | |
69 | len = limit*cell_size; | |
70 | pr_debug("Limiting number of entries to %d\n", limit); | |
71 | fdt_setprop(initial_boot_params, memory, "reg", val, | |
72 | len); | |
73 | } | |
74 | } | |
75 | } | |
76 | ||
9706a36e SN |
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 | 86 | */ |
c972de14 | 87 | int of_fdt_is_compatible(const void *blob, |
9706a36e SN |
88 | unsigned long node, const char *compat) |
89 | { | |
90 | const char *cp; | |
9d0c4dfe RH |
91 | int cplen; |
92 | unsigned long l, score = 0; | |
9706a36e | 93 | |
e6a6928c | 94 | cp = fdt_getprop(blob, node, "compatible", &cplen); |
9706a36e SN |
95 | if (cp == NULL) |
96 | return 0; | |
97 | while (cplen > 0) { | |
a4f740cf | 98 | score++; |
9706a36e | 99 | if (of_compat_cmp(cp, compat, strlen(compat)) == 0) |
a4f740cf | 100 | return score; |
9706a36e SN |
101 | l = strlen(cp) + 1; |
102 | cp += l; | |
103 | cplen -= l; | |
104 | } | |
105 | ||
106 | return 0; | |
107 | } | |
108 | ||
a4f740cf GL |
109 | /** |
110 | * of_fdt_match - Return true if node matches a list of compatible values | |
111 | */ | |
c972de14 | 112 | int of_fdt_match(const void *blob, unsigned long node, |
7b482c83 | 113 | const char *const *compat) |
a4f740cf GL |
114 | { |
115 | unsigned int tmp, score = 0; | |
116 | ||
117 | if (!compat) | |
118 | return 0; | |
119 | ||
120 | while (*compat) { | |
121 | tmp = of_fdt_is_compatible(blob, node, *compat); | |
122 | if (tmp && (score == 0 || (tmp < score))) | |
123 | score = tmp; | |
124 | compat++; | |
125 | } | |
126 | ||
127 | return score; | |
128 | } | |
129 | ||
44856819 | 130 | static void *unflatten_dt_alloc(void **mem, unsigned long size, |
bbd33931 GL |
131 | unsigned long align) |
132 | { | |
133 | void *res; | |
134 | ||
44856819 GL |
135 | *mem = PTR_ALIGN(*mem, align); |
136 | res = *mem; | |
bbd33931 GL |
137 | *mem += size; |
138 | ||
139 | return res; | |
140 | } | |
141 | ||
142 | /** | |
143 | * unflatten_dt_node - Alloc and populate a device_node from the flat tree | |
a40d6c4c | 144 | * @blob: The parent device tree blob |
a7006c97 | 145 | * @mem: Memory chunk to use for allocating device nodes and properties |
bbd33931 GL |
146 | * @p: pointer to node in flat tree |
147 | * @dad: Parent struct device_node | |
bbd33931 GL |
148 | * @fpsize: Size of the node path up at the current depth. |
149 | */ | |
c972de14 | 150 | static void * unflatten_dt_node(void *blob, |
44856819 | 151 | void *mem, |
e6a6928c | 152 | int *poffset, |
a40d6c4c | 153 | struct device_node *dad, |
5063e25a GL |
154 | struct device_node **nodepp, |
155 | unsigned long fpsize, | |
156 | bool dryrun) | |
bbd33931 | 157 | { |
e6a6928c | 158 | const __be32 *p; |
bbd33931 GL |
159 | struct device_node *np; |
160 | struct property *pp, **prev_pp = NULL; | |
e6a6928c | 161 | const char *pathp; |
bbd33931 | 162 | unsigned int l, allocl; |
e6a6928c RH |
163 | static int depth = 0; |
164 | int old_depth; | |
165 | int offset; | |
bbd33931 GL |
166 | int has_name = 0; |
167 | int new_format = 0; | |
168 | ||
e6a6928c RH |
169 | pathp = fdt_get_name(blob, *poffset, &l); |
170 | if (!pathp) | |
bbd33931 | 171 | return mem; |
e6a6928c RH |
172 | |
173 | allocl = l++; | |
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 | 190 | l = 1; |
e6a6928c | 191 | pathp = ""; |
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)); | |
5063e25a | 203 | if (!dryrun) { |
c22618a1 | 204 | char *fn; |
0829f6d1 | 205 | of_node_init(np); |
c22618a1 | 206 | np->full_name = fn = ((char *)np) + sizeof(*np); |
bbd33931 | 207 | if (new_format) { |
bbd33931 GL |
208 | /* rebuild full path for new format */ |
209 | if (dad && dad->parent) { | |
210 | strcpy(fn, dad->full_name); | |
211 | #ifdef DEBUG | |
212 | if ((strlen(fn) + l + 1) != allocl) { | |
213 | pr_debug("%s: p: %d, l: %d, a: %d\n", | |
214 | pathp, (int)strlen(fn), | |
215 | l, allocl); | |
216 | } | |
217 | #endif | |
218 | fn += strlen(fn); | |
219 | } | |
220 | *(fn++) = '/'; | |
c22618a1 GL |
221 | } |
222 | memcpy(fn, pathp, l); | |
223 | ||
bbd33931 | 224 | prev_pp = &np->properties; |
bbd33931 GL |
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 | } | |
bbd33931 | 234 | } |
a7006c97 | 235 | /* process properties */ |
e6a6928c RH |
236 | for (offset = fdt_first_property_offset(blob, *poffset); |
237 | (offset >= 0); | |
238 | (offset = fdt_next_property_offset(blob, offset))) { | |
239 | const char *pname; | |
240 | u32 sz; | |
241 | ||
242 | if (!(p = fdt_getprop_by_offset(blob, offset, &pname, &sz))) { | |
243 | offset = -FDT_ERR_INTERNAL; | |
bbd33931 | 244 | break; |
e6a6928c RH |
245 | } |
246 | ||
bbd33931 GL |
247 | if (pname == NULL) { |
248 | pr_info("Can't find property name in list !\n"); | |
249 | break; | |
250 | } | |
251 | if (strcmp(pname, "name") == 0) | |
252 | has_name = 1; | |
bbd33931 GL |
253 | pp = unflatten_dt_alloc(&mem, sizeof(struct property), |
254 | __alignof__(struct property)); | |
5063e25a | 255 | if (!dryrun) { |
04b954a6 DG |
256 | /* We accept flattened tree phandles either in |
257 | * ePAPR-style "phandle" properties, or the | |
258 | * legacy "linux,phandle" properties. If both | |
259 | * appear and have different values, things | |
260 | * will get weird. Don't do that. */ | |
261 | if ((strcmp(pname, "phandle") == 0) || | |
262 | (strcmp(pname, "linux,phandle") == 0)) { | |
6016a363 | 263 | if (np->phandle == 0) |
e6a6928c | 264 | np->phandle = be32_to_cpup(p); |
bbd33931 | 265 | } |
04b954a6 DG |
266 | /* And we process the "ibm,phandle" property |
267 | * used in pSeries dynamic device tree | |
268 | * stuff */ | |
bbd33931 | 269 | if (strcmp(pname, "ibm,phandle") == 0) |
e6a6928c RH |
270 | np->phandle = be32_to_cpup(p); |
271 | pp->name = (char *)pname; | |
bbd33931 | 272 | pp->length = sz; |
e6a6928c | 273 | pp->value = (__be32 *)p; |
bbd33931 GL |
274 | *prev_pp = pp; |
275 | prev_pp = &pp->next; | |
276 | } | |
bbd33931 GL |
277 | } |
278 | /* with version 0x10 we may not have the name property, recreate | |
279 | * it here from the unit name if absent | |
280 | */ | |
281 | if (!has_name) { | |
e6a6928c | 282 | const char *p1 = pathp, *ps = pathp, *pa = NULL; |
bbd33931 GL |
283 | int sz; |
284 | ||
285 | while (*p1) { | |
286 | if ((*p1) == '@') | |
287 | pa = p1; | |
288 | if ((*p1) == '/') | |
289 | ps = p1 + 1; | |
290 | p1++; | |
291 | } | |
292 | if (pa < ps) | |
293 | pa = p1; | |
294 | sz = (pa - ps) + 1; | |
295 | pp = unflatten_dt_alloc(&mem, sizeof(struct property) + sz, | |
296 | __alignof__(struct property)); | |
5063e25a | 297 | if (!dryrun) { |
bbd33931 GL |
298 | pp->name = "name"; |
299 | pp->length = sz; | |
300 | pp->value = pp + 1; | |
301 | *prev_pp = pp; | |
302 | prev_pp = &pp->next; | |
303 | memcpy(pp->value, ps, sz - 1); | |
304 | ((char *)pp->value)[sz - 1] = 0; | |
305 | pr_debug("fixed up name for %s -> %s\n", pathp, | |
306 | (char *)pp->value); | |
307 | } | |
308 | } | |
5063e25a | 309 | if (!dryrun) { |
bbd33931 GL |
310 | *prev_pp = NULL; |
311 | np->name = of_get_property(np, "name", NULL); | |
312 | np->type = of_get_property(np, "device_type", NULL); | |
313 | ||
314 | if (!np->name) | |
315 | np->name = "<NULL>"; | |
316 | if (!np->type) | |
317 | np->type = "<NULL>"; | |
318 | } | |
e6a6928c RH |
319 | |
320 | old_depth = depth; | |
321 | *poffset = fdt_next_node(blob, *poffset, &depth); | |
322 | if (depth < 0) | |
323 | depth = 0; | |
324 | while (*poffset > 0 && depth > old_depth) | |
5063e25a GL |
325 | mem = unflatten_dt_node(blob, mem, poffset, np, NULL, |
326 | fpsize, dryrun); | |
e6a6928c RH |
327 | |
328 | if (*poffset < 0 && *poffset != -FDT_ERR_NOTFOUND) | |
329 | pr_err("unflatten: error %d processing FDT\n", *poffset); | |
5063e25a GL |
330 | if (nodepp) |
331 | *nodepp = np; | |
e6a6928c | 332 | |
bbd33931 GL |
333 | return mem; |
334 | } | |
41f88009 | 335 | |
fe140423 SN |
336 | /** |
337 | * __unflatten_device_tree - create tree of device_nodes from flat blob | |
338 | * | |
339 | * unflattens a device-tree, creating the | |
340 | * tree of struct device_node. It also fills the "name" and "type" | |
341 | * pointers of the nodes so the normal device-tree walking functions | |
342 | * can be used. | |
343 | * @blob: The blob to expand | |
344 | * @mynodes: The device_node tree created by the call | |
345 | * @dt_alloc: An allocator that provides a virtual address to memory | |
346 | * for the resulting tree | |
347 | */ | |
c972de14 | 348 | static void __unflatten_device_tree(void *blob, |
fe140423 SN |
349 | struct device_node **mynodes, |
350 | void * (*dt_alloc)(u64 size, u64 align)) | |
351 | { | |
44856819 | 352 | unsigned long size; |
e6a6928c RH |
353 | int start; |
354 | void *mem; | |
fe140423 SN |
355 | |
356 | pr_debug(" -> unflatten_device_tree()\n"); | |
357 | ||
358 | if (!blob) { | |
359 | pr_debug("No device tree pointer\n"); | |
360 | return; | |
361 | } | |
362 | ||
363 | pr_debug("Unflattening device tree:\n"); | |
c972de14 RH |
364 | pr_debug("magic: %08x\n", fdt_magic(blob)); |
365 | pr_debug("size: %08x\n", fdt_totalsize(blob)); | |
366 | pr_debug("version: %08x\n", fdt_version(blob)); | |
fe140423 | 367 | |
c972de14 | 368 | if (fdt_check_header(blob)) { |
fe140423 SN |
369 | pr_err("Invalid device tree blob header\n"); |
370 | return; | |
371 | } | |
372 | ||
373 | /* First pass, scan for size */ | |
e6a6928c | 374 | start = 0; |
5063e25a | 375 | size = (unsigned long)unflatten_dt_node(blob, NULL, &start, NULL, NULL, 0, true); |
44856819 | 376 | size = ALIGN(size, 4); |
fe140423 SN |
377 | |
378 | pr_debug(" size is %lx, allocating...\n", size); | |
379 | ||
380 | /* Allocate memory for the expanded device tree */ | |
44856819 GL |
381 | mem = dt_alloc(size + 4, __alignof__(struct device_node)); |
382 | memset(mem, 0, size); | |
fe140423 | 383 | |
44856819 | 384 | *(__be32 *)(mem + size) = cpu_to_be32(0xdeadbeef); |
9e401275 | 385 | |
44856819 | 386 | pr_debug(" unflattening %p...\n", mem); |
fe140423 SN |
387 | |
388 | /* Second pass, do actual unflattening */ | |
e6a6928c | 389 | start = 0; |
5063e25a | 390 | unflatten_dt_node(blob, mem, &start, NULL, mynodes, 0, false); |
44856819 | 391 | if (be32_to_cpup(mem + size) != 0xdeadbeef) |
fe140423 | 392 | pr_warning("End of tree marker overwritten: %08x\n", |
44856819 | 393 | be32_to_cpup(mem + size)); |
fe140423 SN |
394 | |
395 | pr_debug(" <- unflatten_device_tree()\n"); | |
396 | } | |
397 | ||
398 | static void *kernel_tree_alloc(u64 size, u64 align) | |
399 | { | |
400 | return kzalloc(size, GFP_KERNEL); | |
401 | } | |
402 | ||
403 | /** | |
404 | * of_fdt_unflatten_tree - create tree of device_nodes from flat blob | |
405 | * | |
406 | * unflattens the device-tree passed by the firmware, creating the | |
407 | * tree of struct device_node. It also fills the "name" and "type" | |
408 | * pointers of the nodes so the normal device-tree walking functions | |
409 | * can be used. | |
410 | */ | |
411 | void of_fdt_unflatten_tree(unsigned long *blob, | |
412 | struct device_node **mynodes) | |
413 | { | |
c972de14 | 414 | __unflatten_device_tree(blob, mynodes, &kernel_tree_alloc); |
fe140423 SN |
415 | } |
416 | EXPORT_SYMBOL_GPL(of_fdt_unflatten_tree); | |
417 | ||
57d00ecf SN |
418 | /* Everything below here references initial_boot_params directly. */ |
419 | int __initdata dt_root_addr_cells; | |
420 | int __initdata dt_root_size_cells; | |
421 | ||
1daa0c4c | 422 | void *initial_boot_params; |
57d00ecf SN |
423 | |
424 | #ifdef CONFIG_OF_EARLY_FLATTREE | |
425 | ||
e8d9d1f5 MS |
426 | /** |
427 | * res_mem_reserve_reg() - reserve all memory described in 'reg' property | |
428 | */ | |
429 | static int __init __reserved_mem_reserve_reg(unsigned long node, | |
430 | const char *uname) | |
431 | { | |
432 | int t_len = (dt_root_addr_cells + dt_root_size_cells) * sizeof(__be32); | |
433 | phys_addr_t base, size; | |
9d0c4dfe RH |
434 | int len; |
435 | const __be32 *prop; | |
3f0c8206 | 436 | int nomap, first = 1; |
e8d9d1f5 MS |
437 | |
438 | prop = of_get_flat_dt_prop(node, "reg", &len); | |
439 | if (!prop) | |
440 | return -ENOENT; | |
441 | ||
442 | if (len && len % t_len != 0) { | |
443 | pr_err("Reserved memory: invalid reg property in '%s', skipping node.\n", | |
444 | uname); | |
445 | return -EINVAL; | |
446 | } | |
447 | ||
448 | nomap = of_get_flat_dt_prop(node, "no-map", NULL) != NULL; | |
449 | ||
450 | while (len >= t_len) { | |
451 | base = dt_mem_next_cell(dt_root_addr_cells, &prop); | |
452 | size = dt_mem_next_cell(dt_root_size_cells, &prop); | |
453 | ||
b5f2a8c0 | 454 | if (size && |
e8d9d1f5 MS |
455 | early_init_dt_reserve_memory_arch(base, size, nomap) == 0) |
456 | pr_debug("Reserved memory: reserved region for node '%s': base %pa, size %ld MiB\n", | |
457 | uname, &base, (unsigned long)size / SZ_1M); | |
458 | else | |
459 | pr_info("Reserved memory: failed to reserve memory for node '%s': base %pa, size %ld MiB\n", | |
460 | uname, &base, (unsigned long)size / SZ_1M); | |
461 | ||
462 | len -= t_len; | |
3f0c8206 MS |
463 | if (first) { |
464 | fdt_reserved_mem_save_node(node, uname, base, size); | |
465 | first = 0; | |
466 | } | |
e8d9d1f5 MS |
467 | } |
468 | return 0; | |
469 | } | |
470 | ||
471 | /** | |
472 | * __reserved_mem_check_root() - check if #size-cells, #address-cells provided | |
473 | * in /reserved-memory matches the values supported by the current implementation, | |
474 | * also check if ranges property has been provided | |
475 | */ | |
5b624118 | 476 | static int __init __reserved_mem_check_root(unsigned long node) |
e8d9d1f5 | 477 | { |
9d0c4dfe | 478 | const __be32 *prop; |
e8d9d1f5 MS |
479 | |
480 | prop = of_get_flat_dt_prop(node, "#size-cells", NULL); | |
481 | if (!prop || be32_to_cpup(prop) != dt_root_size_cells) | |
482 | return -EINVAL; | |
483 | ||
484 | prop = of_get_flat_dt_prop(node, "#address-cells", NULL); | |
485 | if (!prop || be32_to_cpup(prop) != dt_root_addr_cells) | |
486 | return -EINVAL; | |
487 | ||
488 | prop = of_get_flat_dt_prop(node, "ranges", NULL); | |
489 | if (!prop) | |
490 | return -EINVAL; | |
491 | return 0; | |
492 | } | |
493 | ||
494 | /** | |
495 | * fdt_scan_reserved_mem() - scan a single FDT node for reserved memory | |
496 | */ | |
497 | static int __init __fdt_scan_reserved_mem(unsigned long node, const char *uname, | |
498 | int depth, void *data) | |
499 | { | |
500 | static int found; | |
501 | const char *status; | |
3f0c8206 | 502 | int err; |
e8d9d1f5 MS |
503 | |
504 | if (!found && depth == 1 && strcmp(uname, "reserved-memory") == 0) { | |
505 | if (__reserved_mem_check_root(node) != 0) { | |
506 | pr_err("Reserved memory: unsupported node format, ignoring\n"); | |
507 | /* break scan */ | |
508 | return 1; | |
509 | } | |
510 | found = 1; | |
511 | /* scan next node */ | |
512 | return 0; | |
513 | } else if (!found) { | |
514 | /* scan next node */ | |
515 | return 0; | |
516 | } else if (found && depth < 2) { | |
517 | /* scanning of /reserved-memory has been finished */ | |
518 | return 1; | |
519 | } | |
520 | ||
521 | status = of_get_flat_dt_prop(node, "status", NULL); | |
522 | if (status && strcmp(status, "okay") != 0 && strcmp(status, "ok") != 0) | |
523 | return 0; | |
524 | ||
3f0c8206 MS |
525 | err = __reserved_mem_reserve_reg(node, uname); |
526 | if (err == -ENOENT && of_get_flat_dt_prop(node, "size", NULL)) | |
527 | fdt_reserved_mem_save_node(node, uname, 0, 0); | |
e8d9d1f5 MS |
528 | |
529 | /* scan next node */ | |
530 | return 0; | |
531 | } | |
532 | ||
533 | /** | |
534 | * early_init_fdt_scan_reserved_mem() - create reserved memory regions | |
535 | * | |
536 | * This function grabs memory from early allocator for device exclusive use | |
537 | * defined in device tree structures. It should be called by arch specific code | |
538 | * once the early allocator (i.e. memblock) has been fully activated. | |
539 | */ | |
540 | void __init early_init_fdt_scan_reserved_mem(void) | |
541 | { | |
d1552ce4 RH |
542 | int n; |
543 | u64 base, size; | |
544 | ||
2040b527 JC |
545 | if (!initial_boot_params) |
546 | return; | |
547 | ||
d1552ce4 RH |
548 | /* Reserve the dtb region */ |
549 | early_init_dt_reserve_memory_arch(__pa(initial_boot_params), | |
550 | fdt_totalsize(initial_boot_params), | |
551 | 0); | |
552 | ||
553 | /* Process header /memreserve/ fields */ | |
554 | for (n = 0; ; n++) { | |
555 | fdt_get_mem_rsv(initial_boot_params, n, &base, &size); | |
556 | if (!size) | |
557 | break; | |
558 | early_init_dt_reserve_memory_arch(base, size, 0); | |
559 | } | |
560 | ||
e8d9d1f5 | 561 | of_scan_flat_dt(__fdt_scan_reserved_mem, NULL); |
3f0c8206 | 562 | fdt_init_reserved_mem(); |
e8d9d1f5 MS |
563 | } |
564 | ||
57d00ecf SN |
565 | /** |
566 | * of_scan_flat_dt - scan flattened tree blob and call callback on each. | |
567 | * @it: callback function | |
568 | * @data: context data pointer | |
569 | * | |
570 | * This function is used to scan the flattened device-tree, it is | |
571 | * used to extract the memory information at boot before we can | |
572 | * unflatten the tree | |
573 | */ | |
574 | int __init of_scan_flat_dt(int (*it)(unsigned long node, | |
575 | const char *uname, int depth, | |
576 | void *data), | |
577 | void *data) | |
578 | { | |
e6a6928c RH |
579 | const void *blob = initial_boot_params; |
580 | const char *pathp; | |
581 | int offset, rc = 0, depth = -1; | |
582 | ||
583 | for (offset = fdt_next_node(blob, -1, &depth); | |
584 | offset >= 0 && depth >= 0 && !rc; | |
585 | offset = fdt_next_node(blob, offset, &depth)) { | |
586 | ||
587 | pathp = fdt_get_name(blob, offset, NULL); | |
375da3a7 AS |
588 | if (*pathp == '/') |
589 | pathp = kbasename(pathp); | |
e6a6928c RH |
590 | rc = it(offset, pathp, depth, data); |
591 | } | |
57d00ecf SN |
592 | return rc; |
593 | } | |
594 | ||
595 | /** | |
596 | * of_get_flat_dt_root - find the root node in the flat blob | |
597 | */ | |
598 | unsigned long __init of_get_flat_dt_root(void) | |
599 | { | |
e6a6928c | 600 | return 0; |
57d00ecf SN |
601 | } |
602 | ||
c0556d3f RH |
603 | /** |
604 | * of_get_flat_dt_size - Return the total size of the FDT | |
605 | */ | |
606 | int __init of_get_flat_dt_size(void) | |
607 | { | |
608 | return fdt_totalsize(initial_boot_params); | |
609 | } | |
610 | ||
57d00ecf SN |
611 | /** |
612 | * of_get_flat_dt_prop - Given a node in the flat blob, return the property ptr | |
613 | * | |
614 | * This function can be used within scan_flattened_dt callback to get | |
615 | * access to properties | |
616 | */ | |
9d0c4dfe RH |
617 | const void *__init of_get_flat_dt_prop(unsigned long node, const char *name, |
618 | int *size) | |
57d00ecf | 619 | { |
e6a6928c | 620 | return fdt_getprop(initial_boot_params, node, name, size); |
57d00ecf SN |
621 | } |
622 | ||
623 | /** | |
624 | * of_flat_dt_is_compatible - Return true if given node has compat in compatible list | |
625 | * @node: node to test | |
626 | * @compat: compatible string to compare with compatible list. | |
627 | */ | |
628 | int __init of_flat_dt_is_compatible(unsigned long node, const char *compat) | |
629 | { | |
630 | return of_fdt_is_compatible(initial_boot_params, node, compat); | |
631 | } | |
632 | ||
a4f740cf GL |
633 | /** |
634 | * of_flat_dt_match - Return true if node matches a list of compatible values | |
635 | */ | |
7b482c83 | 636 | int __init of_flat_dt_match(unsigned long node, const char *const *compat) |
a4f740cf GL |
637 | { |
638 | return of_fdt_match(initial_boot_params, node, compat); | |
639 | } | |
640 | ||
57d74bcf MS |
641 | struct fdt_scan_status { |
642 | const char *name; | |
643 | int namelen; | |
644 | int depth; | |
645 | int found; | |
646 | int (*iterator)(unsigned long node, const char *uname, int depth, void *data); | |
647 | void *data; | |
648 | }; | |
649 | ||
6a903a25 RH |
650 | const char * __init of_flat_dt_get_machine_name(void) |
651 | { | |
652 | const char *name; | |
653 | unsigned long dt_root = of_get_flat_dt_root(); | |
654 | ||
655 | name = of_get_flat_dt_prop(dt_root, "model", NULL); | |
656 | if (!name) | |
657 | name = of_get_flat_dt_prop(dt_root, "compatible", NULL); | |
658 | return name; | |
659 | } | |
660 | ||
661 | /** | |
662 | * of_flat_dt_match_machine - Iterate match tables to find matching machine. | |
663 | * | |
664 | * @default_match: A machine specific ptr to return in case of no match. | |
665 | * @get_next_compat: callback function to return next compatible match table. | |
666 | * | |
667 | * Iterate through machine match tables to find the best match for the machine | |
668 | * compatible string in the FDT. | |
669 | */ | |
670 | const void * __init of_flat_dt_match_machine(const void *default_match, | |
671 | const void * (*get_next_compat)(const char * const**)) | |
672 | { | |
673 | const void *data = NULL; | |
674 | const void *best_data = default_match; | |
675 | const char *const *compat; | |
676 | unsigned long dt_root; | |
677 | unsigned int best_score = ~1, score = 0; | |
678 | ||
679 | dt_root = of_get_flat_dt_root(); | |
680 | while ((data = get_next_compat(&compat))) { | |
681 | score = of_flat_dt_match(dt_root, compat); | |
682 | if (score > 0 && score < best_score) { | |
683 | best_data = data; | |
684 | best_score = score; | |
685 | } | |
686 | } | |
687 | if (!best_data) { | |
688 | const char *prop; | |
9d0c4dfe | 689 | int size; |
6a903a25 RH |
690 | |
691 | pr_err("\n unrecognized device tree list:\n[ "); | |
692 | ||
693 | prop = of_get_flat_dt_prop(dt_root, "compatible", &size); | |
694 | if (prop) { | |
695 | while (size > 0) { | |
696 | printk("'%s' ", prop); | |
697 | size -= strlen(prop) + 1; | |
698 | prop += strlen(prop) + 1; | |
699 | } | |
700 | } | |
701 | printk("]\n\n"); | |
702 | return NULL; | |
703 | } | |
704 | ||
705 | pr_info("Machine model: %s\n", of_flat_dt_get_machine_name()); | |
706 | ||
707 | return best_data; | |
708 | } | |
709 | ||
f7b3a835 GL |
710 | #ifdef CONFIG_BLK_DEV_INITRD |
711 | /** | |
712 | * early_init_dt_check_for_initrd - Decode initrd location from flat tree | |
713 | * @node: reference to node containing initrd location ('chosen') | |
714 | */ | |
29eb45a9 | 715 | static void __init early_init_dt_check_for_initrd(unsigned long node) |
f7b3a835 | 716 | { |
374d5c99 | 717 | u64 start, end; |
9d0c4dfe RH |
718 | int len; |
719 | const __be32 *prop; | |
f7b3a835 GL |
720 | |
721 | pr_debug("Looking for initrd properties... "); | |
722 | ||
723 | prop = of_get_flat_dt_prop(node, "linux,initrd-start", &len); | |
1406bc2f JK |
724 | if (!prop) |
725 | return; | |
374d5c99 | 726 | start = of_read_number(prop, len/4); |
1406bc2f JK |
727 | |
728 | prop = of_get_flat_dt_prop(node, "linux,initrd-end", &len); | |
729 | if (!prop) | |
730 | return; | |
374d5c99 | 731 | end = of_read_number(prop, len/4); |
f7b3a835 | 732 | |
29eb45a9 RH |
733 | initrd_start = (unsigned long)__va(start); |
734 | initrd_end = (unsigned long)__va(end); | |
735 | initrd_below_start_ok = 1; | |
736 | ||
374d5c99 SS |
737 | pr_debug("initrd_start=0x%llx initrd_end=0x%llx\n", |
738 | (unsigned long long)start, (unsigned long long)end); | |
f7b3a835 GL |
739 | } |
740 | #else | |
29eb45a9 | 741 | static inline void early_init_dt_check_for_initrd(unsigned long node) |
f7b3a835 GL |
742 | { |
743 | } | |
744 | #endif /* CONFIG_BLK_DEV_INITRD */ | |
745 | ||
fb11ffe7 RH |
746 | #ifdef CONFIG_SERIAL_EARLYCON |
747 | extern struct of_device_id __earlycon_of_table[]; | |
748 | ||
749 | int __init early_init_dt_scan_chosen_serial(void) | |
750 | { | |
751 | int offset; | |
752 | const char *p; | |
753 | int l; | |
754 | const struct of_device_id *match = __earlycon_of_table; | |
755 | const void *fdt = initial_boot_params; | |
756 | ||
757 | offset = fdt_path_offset(fdt, "/chosen"); | |
758 | if (offset < 0) | |
759 | offset = fdt_path_offset(fdt, "/chosen@0"); | |
760 | if (offset < 0) | |
761 | return -ENOENT; | |
762 | ||
763 | p = fdt_getprop(fdt, offset, "stdout-path", &l); | |
764 | if (!p) | |
765 | p = fdt_getprop(fdt, offset, "linux,stdout-path", &l); | |
766 | if (!p || !l) | |
767 | return -ENOENT; | |
768 | ||
769 | /* Get the node specified by stdout-path */ | |
770 | offset = fdt_path_offset(fdt, p); | |
771 | if (offset < 0) | |
772 | return -ENODEV; | |
773 | ||
774 | while (match->compatible) { | |
775 | unsigned long addr; | |
776 | if (fdt_node_check_compatible(fdt, offset, match->compatible)) { | |
777 | match++; | |
778 | continue; | |
779 | } | |
780 | ||
781 | addr = fdt_translate_address(fdt, offset); | |
782 | if (!addr) | |
783 | return -ENXIO; | |
784 | ||
785 | of_setup_earlycon(addr, match->data); | |
786 | return 0; | |
787 | } | |
788 | return -ENODEV; | |
789 | } | |
790 | ||
791 | static int __init setup_of_earlycon(char *buf) | |
792 | { | |
793 | if (buf) | |
794 | return 0; | |
795 | ||
796 | return early_init_dt_scan_chosen_serial(); | |
797 | } | |
798 | early_param("earlycon", setup_of_earlycon); | |
799 | #endif | |
800 | ||
f00abd94 GL |
801 | /** |
802 | * early_init_dt_scan_root - fetch the top level address and size cells | |
803 | */ | |
804 | int __init early_init_dt_scan_root(unsigned long node, const char *uname, | |
805 | int depth, void *data) | |
806 | { | |
9d0c4dfe | 807 | const __be32 *prop; |
f00abd94 GL |
808 | |
809 | if (depth != 0) | |
810 | return 0; | |
811 | ||
33714881 JK |
812 | dt_root_size_cells = OF_ROOT_NODE_SIZE_CELLS_DEFAULT; |
813 | dt_root_addr_cells = OF_ROOT_NODE_ADDR_CELLS_DEFAULT; | |
814 | ||
f00abd94 | 815 | prop = of_get_flat_dt_prop(node, "#size-cells", NULL); |
33714881 JK |
816 | if (prop) |
817 | dt_root_size_cells = be32_to_cpup(prop); | |
f00abd94 GL |
818 | pr_debug("dt_root_size_cells = %x\n", dt_root_size_cells); |
819 | ||
820 | prop = of_get_flat_dt_prop(node, "#address-cells", NULL); | |
33714881 JK |
821 | if (prop) |
822 | dt_root_addr_cells = be32_to_cpup(prop); | |
f00abd94 GL |
823 | pr_debug("dt_root_addr_cells = %x\n", dt_root_addr_cells); |
824 | ||
825 | /* break now */ | |
826 | return 1; | |
827 | } | |
828 | ||
9d0c4dfe | 829 | u64 __init dt_mem_next_cell(int s, const __be32 **cellp) |
83f7a06e | 830 | { |
9d0c4dfe | 831 | const __be32 *p = *cellp; |
83f7a06e GL |
832 | |
833 | *cellp = p + s; | |
834 | return of_read_number(p, s); | |
835 | } | |
836 | ||
51975db0 GL |
837 | /** |
838 | * early_init_dt_scan_memory - Look for an parse memory nodes | |
839 | */ | |
840 | int __init early_init_dt_scan_memory(unsigned long node, const char *uname, | |
841 | int depth, void *data) | |
842 | { | |
9d0c4dfe RH |
843 | const char *type = of_get_flat_dt_prop(node, "device_type", NULL); |
844 | const __be32 *reg, *endp; | |
845 | int l; | |
51975db0 GL |
846 | |
847 | /* We are scanning "memory" nodes only */ | |
848 | if (type == NULL) { | |
849 | /* | |
850 | * The longtrail doesn't have a device_type on the | |
851 | * /memory node, so look for the node called /memory@0. | |
852 | */ | |
b44aa25d | 853 | if (!IS_ENABLED(CONFIG_PPC32) || depth != 1 || strcmp(uname, "memory@0") != 0) |
51975db0 GL |
854 | return 0; |
855 | } else if (strcmp(type, "memory") != 0) | |
856 | return 0; | |
857 | ||
858 | reg = of_get_flat_dt_prop(node, "linux,usable-memory", &l); | |
859 | if (reg == NULL) | |
860 | reg = of_get_flat_dt_prop(node, "reg", &l); | |
861 | if (reg == NULL) | |
862 | return 0; | |
863 | ||
864 | endp = reg + (l / sizeof(__be32)); | |
865 | ||
9d0c4dfe | 866 | pr_debug("memory scan node %s, reg size %d, data: %x %x %x %x,\n", |
51975db0 GL |
867 | uname, l, reg[0], reg[1], reg[2], reg[3]); |
868 | ||
869 | while ((endp - reg) >= (dt_root_addr_cells + dt_root_size_cells)) { | |
870 | u64 base, size; | |
871 | ||
872 | base = dt_mem_next_cell(dt_root_addr_cells, ®); | |
873 | size = dt_mem_next_cell(dt_root_size_cells, ®); | |
874 | ||
875 | if (size == 0) | |
876 | continue; | |
877 | pr_debug(" - %llx , %llx\n", (unsigned long long)base, | |
878 | (unsigned long long)size); | |
879 | ||
880 | early_init_dt_add_memory_arch(base, size); | |
881 | } | |
882 | ||
883 | return 0; | |
884 | } | |
885 | ||
86e03221 GL |
886 | int __init early_init_dt_scan_chosen(unsigned long node, const char *uname, |
887 | int depth, void *data) | |
888 | { | |
9d0c4dfe RH |
889 | int l; |
890 | const char *p; | |
86e03221 GL |
891 | |
892 | pr_debug("search \"chosen\", depth: %d, uname: %s\n", depth, uname); | |
893 | ||
85f60ae4 | 894 | if (depth != 1 || !data || |
86e03221 GL |
895 | (strcmp(uname, "chosen") != 0 && strcmp(uname, "chosen@0") != 0)) |
896 | return 0; | |
897 | ||
898 | early_init_dt_check_for_initrd(node); | |
899 | ||
25985edc | 900 | /* Retrieve command line */ |
86e03221 GL |
901 | p = of_get_flat_dt_prop(node, "bootargs", &l); |
902 | if (p != NULL && l > 0) | |
85f60ae4 | 903 | strlcpy(data, p, min((int)l, COMMAND_LINE_SIZE)); |
86e03221 | 904 | |
78b782cb BH |
905 | /* |
906 | * CONFIG_CMDLINE is meant to be a default in case nothing else | |
907 | * managed to set the command line, unless CONFIG_CMDLINE_FORCE | |
908 | * is set in which case we override whatever was found earlier. | |
909 | */ | |
86e03221 GL |
910 | #ifdef CONFIG_CMDLINE |
911 | #ifndef CONFIG_CMDLINE_FORCE | |
78b782cb | 912 | if (!((char *)data)[0]) |
86e03221 | 913 | #endif |
85f60ae4 | 914 | strlcpy(data, CONFIG_CMDLINE, COMMAND_LINE_SIZE); |
86e03221 GL |
915 | #endif /* CONFIG_CMDLINE */ |
916 | ||
85f60ae4 | 917 | pr_debug("Command line is: %s\n", (char*)data); |
86e03221 GL |
918 | |
919 | /* break now */ | |
920 | return 1; | |
921 | } | |
922 | ||
a1727da5 | 923 | #ifdef CONFIG_HAVE_MEMBLOCK |
3069f0c0 LA |
924 | #define MAX_PHYS_ADDR ((phys_addr_t)~0) |
925 | ||
068f6310 RH |
926 | void __init __weak early_init_dt_add_memory_arch(u64 base, u64 size) |
927 | { | |
928 | const u64 phys_offset = __pa(PAGE_OFFSET); | |
8f73d4b7 GU |
929 | |
930 | if (!PAGE_ALIGNED(base)) { | |
931 | size -= PAGE_SIZE - (base & ~PAGE_MASK); | |
932 | base = PAGE_ALIGN(base); | |
933 | } | |
068f6310 | 934 | size &= PAGE_MASK; |
a67a6ed1 | 935 | |
3069f0c0 LA |
936 | if (base > MAX_PHYS_ADDR) { |
937 | pr_warning("Ignoring memory block 0x%llx - 0x%llx\n", | |
938 | base, base + size); | |
939 | return; | |
940 | } | |
a67a6ed1 | 941 | |
9aacd602 SK |
942 | if (base + size - 1 > MAX_PHYS_ADDR) { |
943 | pr_warning("Ignoring memory range 0x%llx - 0x%llx\n", | |
944 | ((u64)MAX_PHYS_ADDR) + 1, base + size); | |
945 | size = MAX_PHYS_ADDR - base + 1; | |
a67a6ed1 LA |
946 | } |
947 | ||
068f6310 RH |
948 | if (base + size < phys_offset) { |
949 | pr_warning("Ignoring memory block 0x%llx - 0x%llx\n", | |
950 | base, base + size); | |
951 | return; | |
952 | } | |
953 | if (base < phys_offset) { | |
954 | pr_warning("Ignoring memory range 0x%llx - 0x%llx\n", | |
955 | base, phys_offset); | |
956 | size -= phys_offset - base; | |
957 | base = phys_offset; | |
958 | } | |
959 | memblock_add(base, size); | |
960 | } | |
961 | ||
e8d9d1f5 MS |
962 | int __init __weak early_init_dt_reserve_memory_arch(phys_addr_t base, |
963 | phys_addr_t size, bool nomap) | |
964 | { | |
965 | if (memblock_is_region_reserved(base, size)) | |
966 | return -EBUSY; | |
967 | if (nomap) | |
968 | return memblock_remove(base, size); | |
969 | return memblock_reserve(base, size); | |
970 | } | |
971 | ||
a1727da5 GL |
972 | /* |
973 | * called from unflatten_device_tree() to bootstrap devicetree itself | |
974 | * Architectures can override this definition if memblock isn't used | |
975 | */ | |
976 | void * __init __weak early_init_dt_alloc_memory_arch(u64 size, u64 align) | |
977 | { | |
978 | return __va(memblock_alloc(size, align)); | |
979 | } | |
e8d9d1f5 MS |
980 | #else |
981 | int __init __weak early_init_dt_reserve_memory_arch(phys_addr_t base, | |
982 | phys_addr_t size, bool nomap) | |
983 | { | |
1d1a661d RH |
984 | pr_err("Reserved memory not supported, ignoring range 0x%pa - 0x%pa%s\n", |
985 | &base, &size, nomap ? " (nomap)" : ""); | |
e8d9d1f5 MS |
986 | return -ENOSYS; |
987 | } | |
a1727da5 GL |
988 | #endif |
989 | ||
4972a74b | 990 | bool __init early_init_dt_verify(void *params) |
0288ffcb RH |
991 | { |
992 | if (!params) | |
993 | return false; | |
994 | ||
0288ffcb | 995 | /* check device tree validity */ |
50ba08f3 | 996 | if (fdt_check_header(params)) |
0288ffcb | 997 | return false; |
0288ffcb | 998 | |
50ba08f3 BH |
999 | /* Setup flat device-tree pointer */ |
1000 | initial_boot_params = params; | |
4972a74b LA |
1001 | return true; |
1002 | } | |
1003 | ||
1004 | ||
1005 | void __init early_init_dt_scan_nodes(void) | |
1006 | { | |
0288ffcb RH |
1007 | /* Retrieve various information from the /chosen node */ |
1008 | of_scan_flat_dt(early_init_dt_scan_chosen, boot_command_line); | |
1009 | ||
1010 | /* Initialize {size,address}-cells info */ | |
1011 | of_scan_flat_dt(early_init_dt_scan_root, NULL); | |
1012 | ||
1013 | /* Setup memory, calling early_init_dt_add_memory_arch */ | |
1014 | of_scan_flat_dt(early_init_dt_scan_memory, NULL); | |
4972a74b LA |
1015 | } |
1016 | ||
1017 | bool __init early_init_dt_scan(void *params) | |
1018 | { | |
1019 | bool status; | |
1020 | ||
1021 | status = early_init_dt_verify(params); | |
1022 | if (!status) | |
1023 | return false; | |
0288ffcb | 1024 | |
4972a74b | 1025 | early_init_dt_scan_nodes(); |
0288ffcb RH |
1026 | return true; |
1027 | } | |
1028 | ||
41f88009 GL |
1029 | /** |
1030 | * unflatten_device_tree - create tree of device_nodes from flat blob | |
1031 | * | |
1032 | * unflattens the device-tree passed by the firmware, creating the | |
1033 | * tree of struct device_node. It also fills the "name" and "type" | |
1034 | * pointers of the nodes so the normal device-tree walking functions | |
1035 | * can be used. | |
1036 | */ | |
1037 | void __init unflatten_device_tree(void) | |
1038 | { | |
5063e25a | 1039 | __unflatten_device_tree(initial_boot_params, &of_root, |
672c5446 | 1040 | early_init_dt_alloc_memory_arch); |
41f88009 | 1041 | |
4c7d6361 | 1042 | /* Get pointer to "/chosen" and "/aliases" nodes for use everywhere */ |
611cad72 | 1043 | of_alias_scan(early_init_dt_alloc_memory_arch); |
41f88009 | 1044 | } |
e6ce1324 | 1045 | |
a8bf7527 RH |
1046 | /** |
1047 | * unflatten_and_copy_device_tree - copy and create tree of device_nodes from flat blob | |
1048 | * | |
1049 | * Copies and unflattens the device-tree passed by the firmware, creating the | |
1050 | * tree of struct device_node. It also fills the "name" and "type" | |
1051 | * pointers of the nodes so the normal device-tree walking functions | |
1052 | * can be used. This should only be used when the FDT memory has not been | |
1053 | * reserved such is the case when the FDT is built-in to the kernel init | |
1054 | * section. If the FDT memory is reserved already then unflatten_device_tree | |
1055 | * should be used instead. | |
1056 | */ | |
1057 | void __init unflatten_and_copy_device_tree(void) | |
1058 | { | |
6f041e99 JH |
1059 | int size; |
1060 | void *dt; | |
1061 | ||
1062 | if (!initial_boot_params) { | |
1063 | pr_warn("No valid device tree found, continuing without\n"); | |
1064 | return; | |
1065 | } | |
1066 | ||
c972de14 | 1067 | size = fdt_totalsize(initial_boot_params); |
6f041e99 | 1068 | dt = early_init_dt_alloc_memory_arch(size, |
c972de14 | 1069 | roundup_pow_of_two(FDT_V17_SIZE)); |
a8bf7527 RH |
1070 | |
1071 | if (dt) { | |
1072 | memcpy(dt, initial_boot_params, size); | |
1073 | initial_boot_params = dt; | |
1074 | } | |
1075 | unflatten_device_tree(); | |
1076 | } | |
1077 | ||
b0a6fb36 RH |
1078 | #if defined(CONFIG_DEBUG_FS) && defined(DEBUG) |
1079 | static struct debugfs_blob_wrapper flat_dt_blob; | |
1080 | ||
1081 | static int __init of_flat_dt_debugfs_export_fdt(void) | |
1082 | { | |
1083 | struct dentry *d = debugfs_create_dir("device-tree", NULL); | |
1084 | ||
1085 | if (!d) | |
1086 | return -ENOENT; | |
1087 | ||
1088 | flat_dt_blob.data = initial_boot_params; | |
1089 | flat_dt_blob.size = fdt_totalsize(initial_boot_params); | |
1090 | ||
1091 | d = debugfs_create_blob("flat-device-tree", S_IFREG | S_IRUSR, | |
1092 | d, &flat_dt_blob); | |
1093 | if (!d) | |
1094 | return -ENOENT; | |
1095 | ||
1096 | return 0; | |
1097 | } | |
1098 | module_init(of_flat_dt_debugfs_export_fdt); | |
1099 | #endif | |
1100 | ||
e6ce1324 | 1101 | #endif /* CONFIG_OF_EARLY_FLATTREE */ |