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