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 | ||
08d53aa5 | 12 | #include <linux/crc32.h> |
41f88009 | 13 | #include <linux/kernel.h> |
f7b3a835 | 14 | #include <linux/initrd.h> |
a1727da5 | 15 | #include <linux/memblock.h> |
e169cfbe GL |
16 | #include <linux/of.h> |
17 | #include <linux/of_fdt.h> | |
3f0c8206 | 18 | #include <linux/of_reserved_mem.h> |
e8d9d1f5 | 19 | #include <linux/sizes.h> |
4ef7b373 JK |
20 | #include <linux/string.h> |
21 | #include <linux/errno.h> | |
fe140423 | 22 | #include <linux/slab.h> |
e6a6928c | 23 | #include <linux/libfdt.h> |
b0a6fb36 | 24 | #include <linux/debugfs.h> |
fb11ffe7 | 25 | #include <linux/serial_core.h> |
08d53aa5 | 26 | #include <linux/sysfs.h> |
51975db0 | 27 | |
c89810ac | 28 | #include <asm/setup.h> /* for COMMAND_LINE_SIZE */ |
4ef7b373 JK |
29 | #include <asm/page.h> |
30 | ||
704033ce LA |
31 | /* |
32 | * of_fdt_limit_memory - limit the number of regions in the /memory node | |
33 | * @limit: maximum entries | |
34 | * | |
35 | * Adjust the flattened device tree to have at most 'limit' number of | |
36 | * memory entries in the /memory node. This function may be called | |
37 | * any time after initial_boot_param is set. | |
38 | */ | |
39 | void of_fdt_limit_memory(int limit) | |
40 | { | |
41 | int memory; | |
42 | int len; | |
43 | const void *val; | |
44 | int nr_address_cells = OF_ROOT_NODE_ADDR_CELLS_DEFAULT; | |
45 | int nr_size_cells = OF_ROOT_NODE_SIZE_CELLS_DEFAULT; | |
46 | const uint32_t *addr_prop; | |
47 | const uint32_t *size_prop; | |
48 | int root_offset; | |
49 | int cell_size; | |
50 | ||
51 | root_offset = fdt_path_offset(initial_boot_params, "/"); | |
52 | if (root_offset < 0) | |
53 | return; | |
54 | ||
55 | addr_prop = fdt_getprop(initial_boot_params, root_offset, | |
56 | "#address-cells", NULL); | |
57 | if (addr_prop) | |
58 | nr_address_cells = fdt32_to_cpu(*addr_prop); | |
59 | ||
60 | size_prop = fdt_getprop(initial_boot_params, root_offset, | |
61 | "#size-cells", NULL); | |
62 | if (size_prop) | |
63 | nr_size_cells = fdt32_to_cpu(*size_prop); | |
64 | ||
65 | cell_size = sizeof(uint32_t)*(nr_address_cells + nr_size_cells); | |
66 | ||
67 | memory = fdt_path_offset(initial_boot_params, "/memory"); | |
68 | if (memory > 0) { | |
69 | val = fdt_getprop(initial_boot_params, memory, "reg", &len); | |
70 | if (len > limit*cell_size) { | |
71 | len = limit*cell_size; | |
72 | pr_debug("Limiting number of entries to %d\n", limit); | |
73 | fdt_setprop(initial_boot_params, memory, "reg", val, | |
74 | len); | |
75 | } | |
76 | } | |
77 | } | |
78 | ||
9706a36e SN |
79 | /** |
80 | * of_fdt_is_compatible - Return true if given node from the given blob has | |
81 | * compat in its compatible list | |
82 | * @blob: A device tree blob | |
83 | * @node: node to test | |
84 | * @compat: compatible string to compare with compatible list. | |
a4f740cf GL |
85 | * |
86 | * On match, returns a non-zero value with smaller values returned for more | |
87 | * specific compatible values. | |
9706a36e | 88 | */ |
c972de14 | 89 | int of_fdt_is_compatible(const void *blob, |
9706a36e SN |
90 | unsigned long node, const char *compat) |
91 | { | |
92 | const char *cp; | |
9d0c4dfe RH |
93 | int cplen; |
94 | unsigned long l, score = 0; | |
9706a36e | 95 | |
e6a6928c | 96 | cp = fdt_getprop(blob, node, "compatible", &cplen); |
9706a36e SN |
97 | if (cp == NULL) |
98 | return 0; | |
99 | while (cplen > 0) { | |
a4f740cf | 100 | score++; |
9706a36e | 101 | if (of_compat_cmp(cp, compat, strlen(compat)) == 0) |
a4f740cf | 102 | return score; |
9706a36e SN |
103 | l = strlen(cp) + 1; |
104 | cp += l; | |
105 | cplen -= l; | |
106 | } | |
107 | ||
108 | return 0; | |
109 | } | |
110 | ||
cc783786 KC |
111 | /** |
112 | * of_fdt_is_big_endian - Return true if given node needs BE MMIO accesses | |
113 | * @blob: A device tree blob | |
114 | * @node: node to test | |
115 | * | |
116 | * Returns true if the node has a "big-endian" property, or if the kernel | |
117 | * was compiled for BE *and* the node has a "native-endian" property. | |
118 | * Returns false otherwise. | |
119 | */ | |
120 | bool of_fdt_is_big_endian(const void *blob, unsigned long node) | |
121 | { | |
122 | if (fdt_getprop(blob, node, "big-endian", NULL)) | |
123 | return true; | |
124 | if (IS_ENABLED(CONFIG_CPU_BIG_ENDIAN) && | |
125 | fdt_getprop(blob, node, "native-endian", NULL)) | |
126 | return true; | |
127 | return false; | |
128 | } | |
129 | ||
a4f740cf GL |
130 | /** |
131 | * of_fdt_match - Return true if node matches a list of compatible values | |
132 | */ | |
c972de14 | 133 | int of_fdt_match(const void *blob, unsigned long node, |
7b482c83 | 134 | const char *const *compat) |
a4f740cf GL |
135 | { |
136 | unsigned int tmp, score = 0; | |
137 | ||
138 | if (!compat) | |
139 | return 0; | |
140 | ||
141 | while (*compat) { | |
142 | tmp = of_fdt_is_compatible(blob, node, *compat); | |
143 | if (tmp && (score == 0 || (tmp < score))) | |
144 | score = tmp; | |
145 | compat++; | |
146 | } | |
147 | ||
148 | return score; | |
149 | } | |
150 | ||
44856819 | 151 | static void *unflatten_dt_alloc(void **mem, unsigned long size, |
bbd33931 GL |
152 | unsigned long align) |
153 | { | |
154 | void *res; | |
155 | ||
44856819 GL |
156 | *mem = PTR_ALIGN(*mem, align); |
157 | res = *mem; | |
bbd33931 GL |
158 | *mem += size; |
159 | ||
160 | return res; | |
161 | } | |
162 | ||
163 | /** | |
164 | * unflatten_dt_node - Alloc and populate a device_node from the flat tree | |
a40d6c4c | 165 | * @blob: The parent device tree blob |
a7006c97 | 166 | * @mem: Memory chunk to use for allocating device nodes and properties |
bbd33931 GL |
167 | * @p: pointer to node in flat tree |
168 | * @dad: Parent struct device_node | |
bbd33931 GL |
169 | * @fpsize: Size of the node path up at the current depth. |
170 | */ | |
c972de14 | 171 | static void * unflatten_dt_node(void *blob, |
44856819 | 172 | void *mem, |
e6a6928c | 173 | int *poffset, |
a40d6c4c | 174 | struct device_node *dad, |
5063e25a GL |
175 | struct device_node **nodepp, |
176 | unsigned long fpsize, | |
177 | bool dryrun) | |
bbd33931 | 178 | { |
e6a6928c | 179 | const __be32 *p; |
bbd33931 GL |
180 | struct device_node *np; |
181 | struct property *pp, **prev_pp = NULL; | |
e6a6928c | 182 | const char *pathp; |
bbd33931 | 183 | unsigned int l, allocl; |
e6a6928c RH |
184 | static int depth = 0; |
185 | int old_depth; | |
186 | int offset; | |
bbd33931 GL |
187 | int has_name = 0; |
188 | int new_format = 0; | |
189 | ||
e6a6928c RH |
190 | pathp = fdt_get_name(blob, *poffset, &l); |
191 | if (!pathp) | |
bbd33931 | 192 | return mem; |
e6a6928c | 193 | |
05f4647b | 194 | allocl = ++l; |
bbd33931 GL |
195 | |
196 | /* version 0x10 has a more compact unit name here instead of the full | |
197 | * path. we accumulate the full path size using "fpsize", we'll rebuild | |
198 | * it later. We detect this because the first character of the name is | |
199 | * not '/'. | |
200 | */ | |
201 | if ((*pathp) != '/') { | |
202 | new_format = 1; | |
203 | if (fpsize == 0) { | |
204 | /* root node: special case. fpsize accounts for path | |
205 | * plus terminating zero. root node only has '/', so | |
206 | * fpsize should be 2, but we want to avoid the first | |
207 | * level nodes to have two '/' so we use fpsize 1 here | |
208 | */ | |
209 | fpsize = 1; | |
210 | allocl = 2; | |
0fca5dea | 211 | l = 1; |
e6a6928c | 212 | pathp = ""; |
bbd33931 GL |
213 | } else { |
214 | /* account for '/' and path size minus terminal 0 | |
215 | * already in 'l' | |
216 | */ | |
217 | fpsize += l; | |
218 | allocl = fpsize; | |
219 | } | |
220 | } | |
221 | ||
222 | np = unflatten_dt_alloc(&mem, sizeof(struct device_node) + allocl, | |
223 | __alignof__(struct device_node)); | |
5063e25a | 224 | if (!dryrun) { |
c22618a1 | 225 | char *fn; |
0829f6d1 | 226 | of_node_init(np); |
c22618a1 | 227 | np->full_name = fn = ((char *)np) + sizeof(*np); |
bbd33931 | 228 | if (new_format) { |
bbd33931 GL |
229 | /* rebuild full path for new format */ |
230 | if (dad && dad->parent) { | |
231 | strcpy(fn, dad->full_name); | |
232 | #ifdef DEBUG | |
233 | if ((strlen(fn) + l + 1) != allocl) { | |
234 | pr_debug("%s: p: %d, l: %d, a: %d\n", | |
235 | pathp, (int)strlen(fn), | |
236 | l, allocl); | |
237 | } | |
238 | #endif | |
239 | fn += strlen(fn); | |
240 | } | |
241 | *(fn++) = '/'; | |
c22618a1 GL |
242 | } |
243 | memcpy(fn, pathp, l); | |
244 | ||
bbd33931 | 245 | prev_pp = &np->properties; |
bbd33931 GL |
246 | if (dad != NULL) { |
247 | np->parent = dad; | |
70161ff3 GL |
248 | np->sibling = dad->child; |
249 | dad->child = np; | |
bbd33931 | 250 | } |
bbd33931 | 251 | } |
a7006c97 | 252 | /* process properties */ |
e6a6928c RH |
253 | for (offset = fdt_first_property_offset(blob, *poffset); |
254 | (offset >= 0); | |
255 | (offset = fdt_next_property_offset(blob, offset))) { | |
256 | const char *pname; | |
257 | u32 sz; | |
258 | ||
259 | if (!(p = fdt_getprop_by_offset(blob, offset, &pname, &sz))) { | |
260 | offset = -FDT_ERR_INTERNAL; | |
bbd33931 | 261 | break; |
e6a6928c RH |
262 | } |
263 | ||
bbd33931 GL |
264 | if (pname == NULL) { |
265 | pr_info("Can't find property name in list !\n"); | |
266 | break; | |
267 | } | |
268 | if (strcmp(pname, "name") == 0) | |
269 | has_name = 1; | |
bbd33931 GL |
270 | pp = unflatten_dt_alloc(&mem, sizeof(struct property), |
271 | __alignof__(struct property)); | |
5063e25a | 272 | if (!dryrun) { |
04b954a6 DG |
273 | /* We accept flattened tree phandles either in |
274 | * ePAPR-style "phandle" properties, or the | |
275 | * legacy "linux,phandle" properties. If both | |
276 | * appear and have different values, things | |
277 | * will get weird. Don't do that. */ | |
278 | if ((strcmp(pname, "phandle") == 0) || | |
279 | (strcmp(pname, "linux,phandle") == 0)) { | |
6016a363 | 280 | if (np->phandle == 0) |
e6a6928c | 281 | np->phandle = be32_to_cpup(p); |
bbd33931 | 282 | } |
04b954a6 DG |
283 | /* And we process the "ibm,phandle" property |
284 | * used in pSeries dynamic device tree | |
285 | * stuff */ | |
bbd33931 | 286 | if (strcmp(pname, "ibm,phandle") == 0) |
e6a6928c RH |
287 | np->phandle = be32_to_cpup(p); |
288 | pp->name = (char *)pname; | |
bbd33931 | 289 | pp->length = sz; |
e6a6928c | 290 | pp->value = (__be32 *)p; |
bbd33931 GL |
291 | *prev_pp = pp; |
292 | prev_pp = &pp->next; | |
293 | } | |
bbd33931 GL |
294 | } |
295 | /* with version 0x10 we may not have the name property, recreate | |
296 | * it here from the unit name if absent | |
297 | */ | |
298 | if (!has_name) { | |
e6a6928c | 299 | const char *p1 = pathp, *ps = pathp, *pa = NULL; |
bbd33931 GL |
300 | int sz; |
301 | ||
302 | while (*p1) { | |
303 | if ((*p1) == '@') | |
304 | pa = p1; | |
305 | if ((*p1) == '/') | |
306 | ps = p1 + 1; | |
307 | p1++; | |
308 | } | |
309 | if (pa < ps) | |
310 | pa = p1; | |
311 | sz = (pa - ps) + 1; | |
312 | pp = unflatten_dt_alloc(&mem, sizeof(struct property) + sz, | |
313 | __alignof__(struct property)); | |
5063e25a | 314 | if (!dryrun) { |
bbd33931 GL |
315 | pp->name = "name"; |
316 | pp->length = sz; | |
317 | pp->value = pp + 1; | |
318 | *prev_pp = pp; | |
319 | prev_pp = &pp->next; | |
320 | memcpy(pp->value, ps, sz - 1); | |
321 | ((char *)pp->value)[sz - 1] = 0; | |
322 | pr_debug("fixed up name for %s -> %s\n", pathp, | |
323 | (char *)pp->value); | |
324 | } | |
325 | } | |
5063e25a | 326 | if (!dryrun) { |
bbd33931 GL |
327 | *prev_pp = NULL; |
328 | np->name = of_get_property(np, "name", NULL); | |
329 | np->type = of_get_property(np, "device_type", NULL); | |
330 | ||
331 | if (!np->name) | |
332 | np->name = "<NULL>"; | |
333 | if (!np->type) | |
334 | np->type = "<NULL>"; | |
335 | } | |
e6a6928c RH |
336 | |
337 | old_depth = depth; | |
338 | *poffset = fdt_next_node(blob, *poffset, &depth); | |
339 | if (depth < 0) | |
340 | depth = 0; | |
341 | while (*poffset > 0 && depth > old_depth) | |
5063e25a GL |
342 | mem = unflatten_dt_node(blob, mem, poffset, np, NULL, |
343 | fpsize, dryrun); | |
e6a6928c RH |
344 | |
345 | if (*poffset < 0 && *poffset != -FDT_ERR_NOTFOUND) | |
346 | pr_err("unflatten: error %d processing FDT\n", *poffset); | |
347 | ||
70161ff3 GL |
348 | /* |
349 | * Reverse the child list. Some drivers assumes node order matches .dts | |
350 | * node order | |
351 | */ | |
352 | if (!dryrun && np->child) { | |
353 | struct device_node *child = np->child; | |
354 | np->child = NULL; | |
355 | while (child) { | |
356 | struct device_node *next = child->sibling; | |
357 | child->sibling = np->child; | |
358 | np->child = child; | |
359 | child = next; | |
360 | } | |
361 | } | |
362 | ||
5063e25a GL |
363 | if (nodepp) |
364 | *nodepp = np; | |
e6a6928c | 365 | |
bbd33931 GL |
366 | return mem; |
367 | } | |
41f88009 | 368 | |
fe140423 SN |
369 | /** |
370 | * __unflatten_device_tree - create tree of device_nodes from flat blob | |
371 | * | |
372 | * unflattens a device-tree, creating the | |
373 | * tree of struct device_node. It also fills the "name" and "type" | |
374 | * pointers of the nodes so the normal device-tree walking functions | |
375 | * can be used. | |
376 | * @blob: The blob to expand | |
377 | * @mynodes: The device_node tree created by the call | |
378 | * @dt_alloc: An allocator that provides a virtual address to memory | |
379 | * for the resulting tree | |
380 | */ | |
c972de14 | 381 | static void __unflatten_device_tree(void *blob, |
fe140423 SN |
382 | struct device_node **mynodes, |
383 | void * (*dt_alloc)(u64 size, u64 align)) | |
384 | { | |
44856819 | 385 | unsigned long size; |
e6a6928c RH |
386 | int start; |
387 | void *mem; | |
fe140423 SN |
388 | |
389 | pr_debug(" -> unflatten_device_tree()\n"); | |
390 | ||
391 | if (!blob) { | |
392 | pr_debug("No device tree pointer\n"); | |
393 | return; | |
394 | } | |
395 | ||
396 | pr_debug("Unflattening device tree:\n"); | |
c972de14 RH |
397 | pr_debug("magic: %08x\n", fdt_magic(blob)); |
398 | pr_debug("size: %08x\n", fdt_totalsize(blob)); | |
399 | pr_debug("version: %08x\n", fdt_version(blob)); | |
fe140423 | 400 | |
c972de14 | 401 | if (fdt_check_header(blob)) { |
fe140423 SN |
402 | pr_err("Invalid device tree blob header\n"); |
403 | return; | |
404 | } | |
405 | ||
406 | /* First pass, scan for size */ | |
e6a6928c | 407 | start = 0; |
5063e25a | 408 | size = (unsigned long)unflatten_dt_node(blob, NULL, &start, NULL, NULL, 0, true); |
44856819 | 409 | size = ALIGN(size, 4); |
fe140423 SN |
410 | |
411 | pr_debug(" size is %lx, allocating...\n", size); | |
412 | ||
413 | /* Allocate memory for the expanded device tree */ | |
44856819 GL |
414 | mem = dt_alloc(size + 4, __alignof__(struct device_node)); |
415 | memset(mem, 0, size); | |
fe140423 | 416 | |
44856819 | 417 | *(__be32 *)(mem + size) = cpu_to_be32(0xdeadbeef); |
9e401275 | 418 | |
44856819 | 419 | pr_debug(" unflattening %p...\n", mem); |
fe140423 SN |
420 | |
421 | /* Second pass, do actual unflattening */ | |
e6a6928c | 422 | start = 0; |
5063e25a | 423 | unflatten_dt_node(blob, mem, &start, NULL, mynodes, 0, false); |
44856819 | 424 | if (be32_to_cpup(mem + size) != 0xdeadbeef) |
fe140423 | 425 | pr_warning("End of tree marker overwritten: %08x\n", |
44856819 | 426 | be32_to_cpup(mem + size)); |
fe140423 SN |
427 | |
428 | pr_debug(" <- unflatten_device_tree()\n"); | |
429 | } | |
430 | ||
431 | static void *kernel_tree_alloc(u64 size, u64 align) | |
432 | { | |
433 | return kzalloc(size, GFP_KERNEL); | |
434 | } | |
435 | ||
436 | /** | |
437 | * of_fdt_unflatten_tree - create tree of device_nodes from flat blob | |
438 | * | |
439 | * unflattens the device-tree passed by the firmware, creating the | |
440 | * tree of struct device_node. It also fills the "name" and "type" | |
441 | * pointers of the nodes so the normal device-tree walking functions | |
442 | * can be used. | |
443 | */ | |
444 | void of_fdt_unflatten_tree(unsigned long *blob, | |
445 | struct device_node **mynodes) | |
446 | { | |
c972de14 | 447 | __unflatten_device_tree(blob, mynodes, &kernel_tree_alloc); |
fe140423 SN |
448 | } |
449 | EXPORT_SYMBOL_GPL(of_fdt_unflatten_tree); | |
450 | ||
57d00ecf SN |
451 | /* Everything below here references initial_boot_params directly. */ |
452 | int __initdata dt_root_addr_cells; | |
453 | int __initdata dt_root_size_cells; | |
454 | ||
1daa0c4c | 455 | void *initial_boot_params; |
57d00ecf SN |
456 | |
457 | #ifdef CONFIG_OF_EARLY_FLATTREE | |
458 | ||
08d53aa5 AB |
459 | static u32 of_fdt_crc32; |
460 | ||
e8d9d1f5 MS |
461 | /** |
462 | * res_mem_reserve_reg() - reserve all memory described in 'reg' property | |
463 | */ | |
464 | static int __init __reserved_mem_reserve_reg(unsigned long node, | |
465 | const char *uname) | |
466 | { | |
467 | int t_len = (dt_root_addr_cells + dt_root_size_cells) * sizeof(__be32); | |
468 | phys_addr_t base, size; | |
9d0c4dfe RH |
469 | int len; |
470 | const __be32 *prop; | |
3f0c8206 | 471 | int nomap, first = 1; |
e8d9d1f5 MS |
472 | |
473 | prop = of_get_flat_dt_prop(node, "reg", &len); | |
474 | if (!prop) | |
475 | return -ENOENT; | |
476 | ||
477 | if (len && len % t_len != 0) { | |
478 | pr_err("Reserved memory: invalid reg property in '%s', skipping node.\n", | |
479 | uname); | |
480 | return -EINVAL; | |
481 | } | |
482 | ||
483 | nomap = of_get_flat_dt_prop(node, "no-map", NULL) != NULL; | |
484 | ||
485 | while (len >= t_len) { | |
486 | base = dt_mem_next_cell(dt_root_addr_cells, &prop); | |
487 | size = dt_mem_next_cell(dt_root_size_cells, &prop); | |
488 | ||
b5f2a8c0 | 489 | if (size && |
e8d9d1f5 MS |
490 | early_init_dt_reserve_memory_arch(base, size, nomap) == 0) |
491 | pr_debug("Reserved memory: reserved region for node '%s': base %pa, size %ld MiB\n", | |
492 | uname, &base, (unsigned long)size / SZ_1M); | |
493 | else | |
494 | pr_info("Reserved memory: failed to reserve memory for node '%s': base %pa, size %ld MiB\n", | |
495 | uname, &base, (unsigned long)size / SZ_1M); | |
496 | ||
497 | len -= t_len; | |
3f0c8206 MS |
498 | if (first) { |
499 | fdt_reserved_mem_save_node(node, uname, base, size); | |
500 | first = 0; | |
501 | } | |
e8d9d1f5 MS |
502 | } |
503 | return 0; | |
504 | } | |
505 | ||
506 | /** | |
507 | * __reserved_mem_check_root() - check if #size-cells, #address-cells provided | |
508 | * in /reserved-memory matches the values supported by the current implementation, | |
509 | * also check if ranges property has been provided | |
510 | */ | |
5b624118 | 511 | static int __init __reserved_mem_check_root(unsigned long node) |
e8d9d1f5 | 512 | { |
9d0c4dfe | 513 | const __be32 *prop; |
e8d9d1f5 MS |
514 | |
515 | prop = of_get_flat_dt_prop(node, "#size-cells", NULL); | |
516 | if (!prop || be32_to_cpup(prop) != dt_root_size_cells) | |
517 | return -EINVAL; | |
518 | ||
519 | prop = of_get_flat_dt_prop(node, "#address-cells", NULL); | |
520 | if (!prop || be32_to_cpup(prop) != dt_root_addr_cells) | |
521 | return -EINVAL; | |
522 | ||
523 | prop = of_get_flat_dt_prop(node, "ranges", NULL); | |
524 | if (!prop) | |
525 | return -EINVAL; | |
526 | return 0; | |
527 | } | |
528 | ||
529 | /** | |
530 | * fdt_scan_reserved_mem() - scan a single FDT node for reserved memory | |
531 | */ | |
532 | static int __init __fdt_scan_reserved_mem(unsigned long node, const char *uname, | |
533 | int depth, void *data) | |
534 | { | |
535 | static int found; | |
536 | const char *status; | |
3f0c8206 | 537 | int err; |
e8d9d1f5 MS |
538 | |
539 | if (!found && depth == 1 && strcmp(uname, "reserved-memory") == 0) { | |
540 | if (__reserved_mem_check_root(node) != 0) { | |
541 | pr_err("Reserved memory: unsupported node format, ignoring\n"); | |
542 | /* break scan */ | |
543 | return 1; | |
544 | } | |
545 | found = 1; | |
546 | /* scan next node */ | |
547 | return 0; | |
548 | } else if (!found) { | |
549 | /* scan next node */ | |
550 | return 0; | |
551 | } else if (found && depth < 2) { | |
552 | /* scanning of /reserved-memory has been finished */ | |
553 | return 1; | |
554 | } | |
555 | ||
556 | status = of_get_flat_dt_prop(node, "status", NULL); | |
557 | if (status && strcmp(status, "okay") != 0 && strcmp(status, "ok") != 0) | |
558 | return 0; | |
559 | ||
3f0c8206 MS |
560 | err = __reserved_mem_reserve_reg(node, uname); |
561 | if (err == -ENOENT && of_get_flat_dt_prop(node, "size", NULL)) | |
562 | fdt_reserved_mem_save_node(node, uname, 0, 0); | |
e8d9d1f5 MS |
563 | |
564 | /* scan next node */ | |
565 | return 0; | |
566 | } | |
567 | ||
568 | /** | |
569 | * early_init_fdt_scan_reserved_mem() - create reserved memory regions | |
570 | * | |
571 | * This function grabs memory from early allocator for device exclusive use | |
572 | * defined in device tree structures. It should be called by arch specific code | |
573 | * once the early allocator (i.e. memblock) has been fully activated. | |
574 | */ | |
575 | void __init early_init_fdt_scan_reserved_mem(void) | |
576 | { | |
d1552ce4 RH |
577 | int n; |
578 | u64 base, size; | |
579 | ||
2040b527 JC |
580 | if (!initial_boot_params) |
581 | return; | |
582 | ||
d1552ce4 RH |
583 | /* Process header /memreserve/ fields */ |
584 | for (n = 0; ; n++) { | |
585 | fdt_get_mem_rsv(initial_boot_params, n, &base, &size); | |
586 | if (!size) | |
587 | break; | |
588 | early_init_dt_reserve_memory_arch(base, size, 0); | |
589 | } | |
590 | ||
e8d9d1f5 | 591 | of_scan_flat_dt(__fdt_scan_reserved_mem, NULL); |
3f0c8206 | 592 | fdt_init_reserved_mem(); |
e8d9d1f5 MS |
593 | } |
594 | ||
24bbd929 AB |
595 | /** |
596 | * early_init_fdt_reserve_self() - reserve the memory used by the FDT blob | |
597 | */ | |
598 | void __init early_init_fdt_reserve_self(void) | |
599 | { | |
600 | if (!initial_boot_params) | |
601 | return; | |
602 | ||
603 | /* Reserve the dtb region */ | |
604 | early_init_dt_reserve_memory_arch(__pa(initial_boot_params), | |
605 | fdt_totalsize(initial_boot_params), | |
606 | 0); | |
607 | } | |
608 | ||
57d00ecf SN |
609 | /** |
610 | * of_scan_flat_dt - scan flattened tree blob and call callback on each. | |
611 | * @it: callback function | |
612 | * @data: context data pointer | |
613 | * | |
614 | * This function is used to scan the flattened device-tree, it is | |
615 | * used to extract the memory information at boot before we can | |
616 | * unflatten the tree | |
617 | */ | |
618 | int __init of_scan_flat_dt(int (*it)(unsigned long node, | |
619 | const char *uname, int depth, | |
620 | void *data), | |
621 | void *data) | |
622 | { | |
e6a6928c RH |
623 | const void *blob = initial_boot_params; |
624 | const char *pathp; | |
625 | int offset, rc = 0, depth = -1; | |
626 | ||
627 | for (offset = fdt_next_node(blob, -1, &depth); | |
628 | offset >= 0 && depth >= 0 && !rc; | |
629 | offset = fdt_next_node(blob, offset, &depth)) { | |
630 | ||
631 | pathp = fdt_get_name(blob, offset, NULL); | |
375da3a7 AS |
632 | if (*pathp == '/') |
633 | pathp = kbasename(pathp); | |
e6a6928c RH |
634 | rc = it(offset, pathp, depth, data); |
635 | } | |
57d00ecf SN |
636 | return rc; |
637 | } | |
638 | ||
639 | /** | |
640 | * of_get_flat_dt_root - find the root node in the flat blob | |
641 | */ | |
642 | unsigned long __init of_get_flat_dt_root(void) | |
643 | { | |
e6a6928c | 644 | return 0; |
57d00ecf SN |
645 | } |
646 | ||
c0556d3f RH |
647 | /** |
648 | * of_get_flat_dt_size - Return the total size of the FDT | |
649 | */ | |
650 | int __init of_get_flat_dt_size(void) | |
651 | { | |
652 | return fdt_totalsize(initial_boot_params); | |
653 | } | |
654 | ||
57d00ecf SN |
655 | /** |
656 | * of_get_flat_dt_prop - Given a node in the flat blob, return the property ptr | |
657 | * | |
658 | * This function can be used within scan_flattened_dt callback to get | |
659 | * access to properties | |
660 | */ | |
9d0c4dfe RH |
661 | const void *__init of_get_flat_dt_prop(unsigned long node, const char *name, |
662 | int *size) | |
57d00ecf | 663 | { |
e6a6928c | 664 | return fdt_getprop(initial_boot_params, node, name, size); |
57d00ecf SN |
665 | } |
666 | ||
667 | /** | |
668 | * of_flat_dt_is_compatible - Return true if given node has compat in compatible list | |
669 | * @node: node to test | |
670 | * @compat: compatible string to compare with compatible list. | |
671 | */ | |
672 | int __init of_flat_dt_is_compatible(unsigned long node, const char *compat) | |
673 | { | |
674 | return of_fdt_is_compatible(initial_boot_params, node, compat); | |
675 | } | |
676 | ||
a4f740cf GL |
677 | /** |
678 | * of_flat_dt_match - Return true if node matches a list of compatible values | |
679 | */ | |
7b482c83 | 680 | int __init of_flat_dt_match(unsigned long node, const char *const *compat) |
a4f740cf GL |
681 | { |
682 | return of_fdt_match(initial_boot_params, node, compat); | |
683 | } | |
684 | ||
57d74bcf MS |
685 | struct fdt_scan_status { |
686 | const char *name; | |
687 | int namelen; | |
688 | int depth; | |
689 | int found; | |
690 | int (*iterator)(unsigned long node, const char *uname, int depth, void *data); | |
691 | void *data; | |
692 | }; | |
693 | ||
6a903a25 RH |
694 | const char * __init of_flat_dt_get_machine_name(void) |
695 | { | |
696 | const char *name; | |
697 | unsigned long dt_root = of_get_flat_dt_root(); | |
698 | ||
699 | name = of_get_flat_dt_prop(dt_root, "model", NULL); | |
700 | if (!name) | |
701 | name = of_get_flat_dt_prop(dt_root, "compatible", NULL); | |
702 | return name; | |
703 | } | |
704 | ||
705 | /** | |
706 | * of_flat_dt_match_machine - Iterate match tables to find matching machine. | |
707 | * | |
708 | * @default_match: A machine specific ptr to return in case of no match. | |
709 | * @get_next_compat: callback function to return next compatible match table. | |
710 | * | |
711 | * Iterate through machine match tables to find the best match for the machine | |
712 | * compatible string in the FDT. | |
713 | */ | |
714 | const void * __init of_flat_dt_match_machine(const void *default_match, | |
715 | const void * (*get_next_compat)(const char * const**)) | |
716 | { | |
717 | const void *data = NULL; | |
718 | const void *best_data = default_match; | |
719 | const char *const *compat; | |
720 | unsigned long dt_root; | |
721 | unsigned int best_score = ~1, score = 0; | |
722 | ||
723 | dt_root = of_get_flat_dt_root(); | |
724 | while ((data = get_next_compat(&compat))) { | |
725 | score = of_flat_dt_match(dt_root, compat); | |
726 | if (score > 0 && score < best_score) { | |
727 | best_data = data; | |
728 | best_score = score; | |
729 | } | |
730 | } | |
731 | if (!best_data) { | |
732 | const char *prop; | |
9d0c4dfe | 733 | int size; |
6a903a25 RH |
734 | |
735 | pr_err("\n unrecognized device tree list:\n[ "); | |
736 | ||
737 | prop = of_get_flat_dt_prop(dt_root, "compatible", &size); | |
738 | if (prop) { | |
739 | while (size > 0) { | |
740 | printk("'%s' ", prop); | |
741 | size -= strlen(prop) + 1; | |
742 | prop += strlen(prop) + 1; | |
743 | } | |
744 | } | |
745 | printk("]\n\n"); | |
746 | return NULL; | |
747 | } | |
748 | ||
749 | pr_info("Machine model: %s\n", of_flat_dt_get_machine_name()); | |
750 | ||
751 | return best_data; | |
752 | } | |
753 | ||
f7b3a835 GL |
754 | #ifdef CONFIG_BLK_DEV_INITRD |
755 | /** | |
756 | * early_init_dt_check_for_initrd - Decode initrd location from flat tree | |
757 | * @node: reference to node containing initrd location ('chosen') | |
758 | */ | |
29eb45a9 | 759 | static void __init early_init_dt_check_for_initrd(unsigned long node) |
f7b3a835 | 760 | { |
374d5c99 | 761 | u64 start, end; |
9d0c4dfe RH |
762 | int len; |
763 | const __be32 *prop; | |
f7b3a835 GL |
764 | |
765 | pr_debug("Looking for initrd properties... "); | |
766 | ||
767 | prop = of_get_flat_dt_prop(node, "linux,initrd-start", &len); | |
1406bc2f JK |
768 | if (!prop) |
769 | return; | |
374d5c99 | 770 | start = of_read_number(prop, len/4); |
1406bc2f JK |
771 | |
772 | prop = of_get_flat_dt_prop(node, "linux,initrd-end", &len); | |
773 | if (!prop) | |
774 | return; | |
374d5c99 | 775 | end = of_read_number(prop, len/4); |
f7b3a835 | 776 | |
29eb45a9 RH |
777 | initrd_start = (unsigned long)__va(start); |
778 | initrd_end = (unsigned long)__va(end); | |
779 | initrd_below_start_ok = 1; | |
780 | ||
374d5c99 SS |
781 | pr_debug("initrd_start=0x%llx initrd_end=0x%llx\n", |
782 | (unsigned long long)start, (unsigned long long)end); | |
f7b3a835 GL |
783 | } |
784 | #else | |
29eb45a9 | 785 | static inline void early_init_dt_check_for_initrd(unsigned long node) |
f7b3a835 GL |
786 | { |
787 | } | |
788 | #endif /* CONFIG_BLK_DEV_INITRD */ | |
789 | ||
fb11ffe7 RH |
790 | #ifdef CONFIG_SERIAL_EARLYCON |
791 | extern struct of_device_id __earlycon_of_table[]; | |
792 | ||
523bf17f | 793 | static int __init early_init_dt_scan_chosen_serial(void) |
fb11ffe7 RH |
794 | { |
795 | int offset; | |
796 | const char *p; | |
797 | int l; | |
798 | const struct of_device_id *match = __earlycon_of_table; | |
799 | const void *fdt = initial_boot_params; | |
800 | ||
801 | offset = fdt_path_offset(fdt, "/chosen"); | |
802 | if (offset < 0) | |
803 | offset = fdt_path_offset(fdt, "/chosen@0"); | |
804 | if (offset < 0) | |
805 | return -ENOENT; | |
806 | ||
807 | p = fdt_getprop(fdt, offset, "stdout-path", &l); | |
808 | if (!p) | |
809 | p = fdt_getprop(fdt, offset, "linux,stdout-path", &l); | |
810 | if (!p || !l) | |
811 | return -ENOENT; | |
812 | ||
813 | /* Get the node specified by stdout-path */ | |
814 | offset = fdt_path_offset(fdt, p); | |
815 | if (offset < 0) | |
816 | return -ENODEV; | |
817 | ||
ab74d00a | 818 | while (match->compatible[0]) { |
fb11ffe7 RH |
819 | unsigned long addr; |
820 | if (fdt_node_check_compatible(fdt, offset, match->compatible)) { | |
821 | match++; | |
822 | continue; | |
823 | } | |
824 | ||
825 | addr = fdt_translate_address(fdt, offset); | |
826 | if (!addr) | |
827 | return -ENXIO; | |
828 | ||
829 | of_setup_earlycon(addr, match->data); | |
830 | return 0; | |
831 | } | |
832 | return -ENODEV; | |
833 | } | |
834 | ||
835 | static int __init setup_of_earlycon(char *buf) | |
836 | { | |
837 | if (buf) | |
838 | return 0; | |
839 | ||
840 | return early_init_dt_scan_chosen_serial(); | |
841 | } | |
842 | early_param("earlycon", setup_of_earlycon); | |
843 | #endif | |
844 | ||
f00abd94 GL |
845 | /** |
846 | * early_init_dt_scan_root - fetch the top level address and size cells | |
847 | */ | |
848 | int __init early_init_dt_scan_root(unsigned long node, const char *uname, | |
849 | int depth, void *data) | |
850 | { | |
9d0c4dfe | 851 | const __be32 *prop; |
f00abd94 GL |
852 | |
853 | if (depth != 0) | |
854 | return 0; | |
855 | ||
33714881 JK |
856 | dt_root_size_cells = OF_ROOT_NODE_SIZE_CELLS_DEFAULT; |
857 | dt_root_addr_cells = OF_ROOT_NODE_ADDR_CELLS_DEFAULT; | |
858 | ||
f00abd94 | 859 | prop = of_get_flat_dt_prop(node, "#size-cells", NULL); |
33714881 JK |
860 | if (prop) |
861 | dt_root_size_cells = be32_to_cpup(prop); | |
f00abd94 GL |
862 | pr_debug("dt_root_size_cells = %x\n", dt_root_size_cells); |
863 | ||
864 | prop = of_get_flat_dt_prop(node, "#address-cells", NULL); | |
33714881 JK |
865 | if (prop) |
866 | dt_root_addr_cells = be32_to_cpup(prop); | |
f00abd94 GL |
867 | pr_debug("dt_root_addr_cells = %x\n", dt_root_addr_cells); |
868 | ||
869 | /* break now */ | |
870 | return 1; | |
871 | } | |
872 | ||
9d0c4dfe | 873 | u64 __init dt_mem_next_cell(int s, const __be32 **cellp) |
83f7a06e | 874 | { |
9d0c4dfe | 875 | const __be32 *p = *cellp; |
83f7a06e GL |
876 | |
877 | *cellp = p + s; | |
878 | return of_read_number(p, s); | |
879 | } | |
880 | ||
51975db0 GL |
881 | /** |
882 | * early_init_dt_scan_memory - Look for an parse memory nodes | |
883 | */ | |
884 | int __init early_init_dt_scan_memory(unsigned long node, const char *uname, | |
885 | int depth, void *data) | |
886 | { | |
9d0c4dfe RH |
887 | const char *type = of_get_flat_dt_prop(node, "device_type", NULL); |
888 | const __be32 *reg, *endp; | |
889 | int l; | |
51975db0 GL |
890 | |
891 | /* We are scanning "memory" nodes only */ | |
892 | if (type == NULL) { | |
893 | /* | |
894 | * The longtrail doesn't have a device_type on the | |
895 | * /memory node, so look for the node called /memory@0. | |
896 | */ | |
b44aa25d | 897 | if (!IS_ENABLED(CONFIG_PPC32) || depth != 1 || strcmp(uname, "memory@0") != 0) |
51975db0 GL |
898 | return 0; |
899 | } else if (strcmp(type, "memory") != 0) | |
900 | return 0; | |
901 | ||
902 | reg = of_get_flat_dt_prop(node, "linux,usable-memory", &l); | |
903 | if (reg == NULL) | |
904 | reg = of_get_flat_dt_prop(node, "reg", &l); | |
905 | if (reg == NULL) | |
906 | return 0; | |
907 | ||
908 | endp = reg + (l / sizeof(__be32)); | |
909 | ||
c954b36e | 910 | pr_debug("memory scan node %s, reg size %d,\n", uname, l); |
51975db0 GL |
911 | |
912 | while ((endp - reg) >= (dt_root_addr_cells + dt_root_size_cells)) { | |
913 | u64 base, size; | |
914 | ||
915 | base = dt_mem_next_cell(dt_root_addr_cells, ®); | |
916 | size = dt_mem_next_cell(dt_root_size_cells, ®); | |
917 | ||
918 | if (size == 0) | |
919 | continue; | |
920 | pr_debug(" - %llx , %llx\n", (unsigned long long)base, | |
921 | (unsigned long long)size); | |
922 | ||
923 | early_init_dt_add_memory_arch(base, size); | |
924 | } | |
925 | ||
926 | return 0; | |
927 | } | |
928 | ||
86e03221 GL |
929 | int __init early_init_dt_scan_chosen(unsigned long node, const char *uname, |
930 | int depth, void *data) | |
931 | { | |
9d0c4dfe RH |
932 | int l; |
933 | const char *p; | |
86e03221 GL |
934 | |
935 | pr_debug("search \"chosen\", depth: %d, uname: %s\n", depth, uname); | |
936 | ||
85f60ae4 | 937 | if (depth != 1 || !data || |
86e03221 GL |
938 | (strcmp(uname, "chosen") != 0 && strcmp(uname, "chosen@0") != 0)) |
939 | return 0; | |
940 | ||
941 | early_init_dt_check_for_initrd(node); | |
942 | ||
25985edc | 943 | /* Retrieve command line */ |
86e03221 GL |
944 | p = of_get_flat_dt_prop(node, "bootargs", &l); |
945 | if (p != NULL && l > 0) | |
85f60ae4 | 946 | strlcpy(data, p, min((int)l, COMMAND_LINE_SIZE)); |
86e03221 | 947 | |
78b782cb BH |
948 | /* |
949 | * CONFIG_CMDLINE is meant to be a default in case nothing else | |
950 | * managed to set the command line, unless CONFIG_CMDLINE_FORCE | |
951 | * is set in which case we override whatever was found earlier. | |
952 | */ | |
86e03221 GL |
953 | #ifdef CONFIG_CMDLINE |
954 | #ifndef CONFIG_CMDLINE_FORCE | |
78b782cb | 955 | if (!((char *)data)[0]) |
86e03221 | 956 | #endif |
85f60ae4 | 957 | strlcpy(data, CONFIG_CMDLINE, COMMAND_LINE_SIZE); |
86e03221 GL |
958 | #endif /* CONFIG_CMDLINE */ |
959 | ||
85f60ae4 | 960 | pr_debug("Command line is: %s\n", (char*)data); |
86e03221 GL |
961 | |
962 | /* break now */ | |
963 | return 1; | |
964 | } | |
965 | ||
a1727da5 | 966 | #ifdef CONFIG_HAVE_MEMBLOCK |
3069f0c0 LA |
967 | #define MAX_PHYS_ADDR ((phys_addr_t)~0) |
968 | ||
068f6310 RH |
969 | void __init __weak early_init_dt_add_memory_arch(u64 base, u64 size) |
970 | { | |
971 | const u64 phys_offset = __pa(PAGE_OFFSET); | |
8f73d4b7 GU |
972 | |
973 | if (!PAGE_ALIGNED(base)) { | |
8cccffc5 AB |
974 | if (size < PAGE_SIZE - (base & ~PAGE_MASK)) { |
975 | pr_warn("Ignoring memory block 0x%llx - 0x%llx\n", | |
976 | base, base + size); | |
977 | return; | |
978 | } | |
8f73d4b7 GU |
979 | size -= PAGE_SIZE - (base & ~PAGE_MASK); |
980 | base = PAGE_ALIGN(base); | |
981 | } | |
068f6310 | 982 | size &= PAGE_MASK; |
a67a6ed1 | 983 | |
3069f0c0 LA |
984 | if (base > MAX_PHYS_ADDR) { |
985 | pr_warning("Ignoring memory block 0x%llx - 0x%llx\n", | |
986 | base, base + size); | |
987 | return; | |
988 | } | |
a67a6ed1 | 989 | |
9aacd602 SK |
990 | if (base + size - 1 > MAX_PHYS_ADDR) { |
991 | pr_warning("Ignoring memory range 0x%llx - 0x%llx\n", | |
992 | ((u64)MAX_PHYS_ADDR) + 1, base + size); | |
993 | size = MAX_PHYS_ADDR - base + 1; | |
a67a6ed1 LA |
994 | } |
995 | ||
068f6310 RH |
996 | if (base + size < phys_offset) { |
997 | pr_warning("Ignoring memory block 0x%llx - 0x%llx\n", | |
998 | base, base + size); | |
999 | return; | |
1000 | } | |
1001 | if (base < phys_offset) { | |
1002 | pr_warning("Ignoring memory range 0x%llx - 0x%llx\n", | |
1003 | base, phys_offset); | |
1004 | size -= phys_offset - base; | |
1005 | base = phys_offset; | |
1006 | } | |
1007 | memblock_add(base, size); | |
1008 | } | |
1009 | ||
e8d9d1f5 MS |
1010 | int __init __weak early_init_dt_reserve_memory_arch(phys_addr_t base, |
1011 | phys_addr_t size, bool nomap) | |
1012 | { | |
e8d9d1f5 MS |
1013 | if (nomap) |
1014 | return memblock_remove(base, size); | |
1015 | return memblock_reserve(base, size); | |
1016 | } | |
1017 | ||
a1727da5 GL |
1018 | /* |
1019 | * called from unflatten_device_tree() to bootstrap devicetree itself | |
1020 | * Architectures can override this definition if memblock isn't used | |
1021 | */ | |
1022 | void * __init __weak early_init_dt_alloc_memory_arch(u64 size, u64 align) | |
1023 | { | |
1024 | return __va(memblock_alloc(size, align)); | |
1025 | } | |
e8d9d1f5 MS |
1026 | #else |
1027 | int __init __weak early_init_dt_reserve_memory_arch(phys_addr_t base, | |
1028 | phys_addr_t size, bool nomap) | |
1029 | { | |
1d1a661d RH |
1030 | pr_err("Reserved memory not supported, ignoring range 0x%pa - 0x%pa%s\n", |
1031 | &base, &size, nomap ? " (nomap)" : ""); | |
e8d9d1f5 MS |
1032 | return -ENOSYS; |
1033 | } | |
a1727da5 GL |
1034 | #endif |
1035 | ||
4972a74b | 1036 | bool __init early_init_dt_verify(void *params) |
0288ffcb RH |
1037 | { |
1038 | if (!params) | |
1039 | return false; | |
1040 | ||
0288ffcb | 1041 | /* check device tree validity */ |
50ba08f3 | 1042 | if (fdt_check_header(params)) |
0288ffcb | 1043 | return false; |
0288ffcb | 1044 | |
50ba08f3 BH |
1045 | /* Setup flat device-tree pointer */ |
1046 | initial_boot_params = params; | |
08d53aa5 AB |
1047 | of_fdt_crc32 = crc32_be(~0, initial_boot_params, |
1048 | fdt_totalsize(initial_boot_params)); | |
4972a74b LA |
1049 | return true; |
1050 | } | |
1051 | ||
1052 | ||
1053 | void __init early_init_dt_scan_nodes(void) | |
1054 | { | |
0288ffcb RH |
1055 | /* Retrieve various information from the /chosen node */ |
1056 | of_scan_flat_dt(early_init_dt_scan_chosen, boot_command_line); | |
1057 | ||
1058 | /* Initialize {size,address}-cells info */ | |
1059 | of_scan_flat_dt(early_init_dt_scan_root, NULL); | |
1060 | ||
1061 | /* Setup memory, calling early_init_dt_add_memory_arch */ | |
1062 | of_scan_flat_dt(early_init_dt_scan_memory, NULL); | |
4972a74b LA |
1063 | } |
1064 | ||
1065 | bool __init early_init_dt_scan(void *params) | |
1066 | { | |
1067 | bool status; | |
1068 | ||
1069 | status = early_init_dt_verify(params); | |
1070 | if (!status) | |
1071 | return false; | |
0288ffcb | 1072 | |
4972a74b | 1073 | early_init_dt_scan_nodes(); |
0288ffcb RH |
1074 | return true; |
1075 | } | |
1076 | ||
41f88009 GL |
1077 | /** |
1078 | * unflatten_device_tree - create tree of device_nodes from flat blob | |
1079 | * | |
1080 | * unflattens the device-tree passed by the firmware, creating the | |
1081 | * tree of struct device_node. It also fills the "name" and "type" | |
1082 | * pointers of the nodes so the normal device-tree walking functions | |
1083 | * can be used. | |
1084 | */ | |
1085 | void __init unflatten_device_tree(void) | |
1086 | { | |
5063e25a | 1087 | __unflatten_device_tree(initial_boot_params, &of_root, |
672c5446 | 1088 | early_init_dt_alloc_memory_arch); |
41f88009 | 1089 | |
4c7d6361 | 1090 | /* Get pointer to "/chosen" and "/aliases" nodes for use everywhere */ |
611cad72 | 1091 | of_alias_scan(early_init_dt_alloc_memory_arch); |
41f88009 | 1092 | } |
e6ce1324 | 1093 | |
a8bf7527 RH |
1094 | /** |
1095 | * unflatten_and_copy_device_tree - copy and create tree of device_nodes from flat blob | |
1096 | * | |
1097 | * Copies and unflattens the device-tree passed by the firmware, creating the | |
1098 | * tree of struct device_node. It also fills the "name" and "type" | |
1099 | * pointers of the nodes so the normal device-tree walking functions | |
1100 | * can be used. This should only be used when the FDT memory has not been | |
1101 | * reserved such is the case when the FDT is built-in to the kernel init | |
1102 | * section. If the FDT memory is reserved already then unflatten_device_tree | |
1103 | * should be used instead. | |
1104 | */ | |
1105 | void __init unflatten_and_copy_device_tree(void) | |
1106 | { | |
6f041e99 JH |
1107 | int size; |
1108 | void *dt; | |
1109 | ||
1110 | if (!initial_boot_params) { | |
1111 | pr_warn("No valid device tree found, continuing without\n"); | |
1112 | return; | |
1113 | } | |
1114 | ||
c972de14 | 1115 | size = fdt_totalsize(initial_boot_params); |
6f041e99 | 1116 | dt = early_init_dt_alloc_memory_arch(size, |
c972de14 | 1117 | roundup_pow_of_two(FDT_V17_SIZE)); |
a8bf7527 RH |
1118 | |
1119 | if (dt) { | |
1120 | memcpy(dt, initial_boot_params, size); | |
1121 | initial_boot_params = dt; | |
1122 | } | |
1123 | unflatten_device_tree(); | |
1124 | } | |
1125 | ||
08d53aa5 AB |
1126 | #ifdef CONFIG_SYSFS |
1127 | static ssize_t of_fdt_raw_read(struct file *filp, struct kobject *kobj, | |
1128 | struct bin_attribute *bin_attr, | |
1129 | char *buf, loff_t off, size_t count) | |
b0a6fb36 | 1130 | { |
08d53aa5 AB |
1131 | memcpy(buf, initial_boot_params + off, count); |
1132 | return count; | |
1133 | } | |
b0a6fb36 | 1134 | |
08d53aa5 AB |
1135 | static int __init of_fdt_raw_init(void) |
1136 | { | |
1137 | static struct bin_attribute of_fdt_raw_attr = | |
1138 | __BIN_ATTR(fdt, S_IRUSR, of_fdt_raw_read, NULL, 0); | |
b0a6fb36 | 1139 | |
08d53aa5 AB |
1140 | if (!initial_boot_params) |
1141 | return 0; | |
b0a6fb36 | 1142 | |
08d53aa5 AB |
1143 | if (of_fdt_crc32 != crc32_be(~0, initial_boot_params, |
1144 | fdt_totalsize(initial_boot_params))) { | |
1145 | pr_warn("fdt: not creating '/sys/firmware/fdt': CRC check failed\n"); | |
1146 | return 0; | |
1147 | } | |
1148 | of_fdt_raw_attr.size = fdt_totalsize(initial_boot_params); | |
1149 | return sysfs_create_bin_file(firmware_kobj, &of_fdt_raw_attr); | |
b0a6fb36 | 1150 | } |
08d53aa5 | 1151 | late_initcall(of_fdt_raw_init); |
b0a6fb36 RH |
1152 | #endif |
1153 | ||
e6ce1324 | 1154 | #endif /* CONFIG_OF_EARLY_FLATTREE */ |