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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 | ||
bd0096d7 | 12 | #define pr_fmt(fmt) "OF: fdt: " fmt |
606ad42a | 13 | |
08d53aa5 | 14 | #include <linux/crc32.h> |
41f88009 | 15 | #include <linux/kernel.h> |
f7b3a835 | 16 | #include <linux/initrd.h> |
a1727da5 | 17 | #include <linux/memblock.h> |
f8062386 | 18 | #include <linux/mutex.h> |
e169cfbe GL |
19 | #include <linux/of.h> |
20 | #include <linux/of_fdt.h> | |
3f0c8206 | 21 | #include <linux/of_reserved_mem.h> |
e8d9d1f5 | 22 | #include <linux/sizes.h> |
4ef7b373 JK |
23 | #include <linux/string.h> |
24 | #include <linux/errno.h> | |
fe140423 | 25 | #include <linux/slab.h> |
e6a6928c | 26 | #include <linux/libfdt.h> |
b0a6fb36 | 27 | #include <linux/debugfs.h> |
fb11ffe7 | 28 | #include <linux/serial_core.h> |
08d53aa5 | 29 | #include <linux/sysfs.h> |
51975db0 | 30 | |
c89810ac | 31 | #include <asm/setup.h> /* for COMMAND_LINE_SIZE */ |
4ef7b373 JK |
32 | #include <asm/page.h> |
33 | ||
81d0848f FR |
34 | #include "of_private.h" |
35 | ||
704033ce LA |
36 | /* |
37 | * of_fdt_limit_memory - limit the number of regions in the /memory node | |
38 | * @limit: maximum entries | |
39 | * | |
40 | * Adjust the flattened device tree to have at most 'limit' number of | |
41 | * memory entries in the /memory node. This function may be called | |
42 | * any time after initial_boot_param is set. | |
43 | */ | |
44 | void of_fdt_limit_memory(int limit) | |
45 | { | |
46 | int memory; | |
47 | int len; | |
48 | const void *val; | |
49 | int nr_address_cells = OF_ROOT_NODE_ADDR_CELLS_DEFAULT; | |
50 | int nr_size_cells = OF_ROOT_NODE_SIZE_CELLS_DEFAULT; | |
17a70355 RH |
51 | const __be32 *addr_prop; |
52 | const __be32 *size_prop; | |
704033ce LA |
53 | int root_offset; |
54 | int cell_size; | |
55 | ||
56 | root_offset = fdt_path_offset(initial_boot_params, "/"); | |
57 | if (root_offset < 0) | |
58 | return; | |
59 | ||
60 | addr_prop = fdt_getprop(initial_boot_params, root_offset, | |
61 | "#address-cells", NULL); | |
62 | if (addr_prop) | |
63 | nr_address_cells = fdt32_to_cpu(*addr_prop); | |
64 | ||
65 | size_prop = fdt_getprop(initial_boot_params, root_offset, | |
66 | "#size-cells", NULL); | |
67 | if (size_prop) | |
68 | nr_size_cells = fdt32_to_cpu(*size_prop); | |
69 | ||
70 | cell_size = sizeof(uint32_t)*(nr_address_cells + nr_size_cells); | |
71 | ||
72 | memory = fdt_path_offset(initial_boot_params, "/memory"); | |
73 | if (memory > 0) { | |
74 | val = fdt_getprop(initial_boot_params, memory, "reg", &len); | |
75 | if (len > limit*cell_size) { | |
76 | len = limit*cell_size; | |
77 | pr_debug("Limiting number of entries to %d\n", limit); | |
78 | fdt_setprop(initial_boot_params, memory, "reg", val, | |
79 | len); | |
80 | } | |
81 | } | |
82 | } | |
83 | ||
9706a36e SN |
84 | /** |
85 | * of_fdt_is_compatible - Return true if given node from the given blob has | |
86 | * compat in its compatible list | |
87 | * @blob: A device tree blob | |
88 | * @node: node to test | |
89 | * @compat: compatible string to compare with compatible list. | |
a4f740cf GL |
90 | * |
91 | * On match, returns a non-zero value with smaller values returned for more | |
92 | * specific compatible values. | |
9706a36e | 93 | */ |
c972de14 | 94 | int of_fdt_is_compatible(const void *blob, |
9706a36e SN |
95 | unsigned long node, const char *compat) |
96 | { | |
97 | const char *cp; | |
9d0c4dfe RH |
98 | int cplen; |
99 | unsigned long l, score = 0; | |
9706a36e | 100 | |
e6a6928c | 101 | cp = fdt_getprop(blob, node, "compatible", &cplen); |
9706a36e SN |
102 | if (cp == NULL) |
103 | return 0; | |
104 | while (cplen > 0) { | |
a4f740cf | 105 | score++; |
9706a36e | 106 | if (of_compat_cmp(cp, compat, strlen(compat)) == 0) |
a4f740cf | 107 | return score; |
9706a36e SN |
108 | l = strlen(cp) + 1; |
109 | cp += l; | |
110 | cplen -= l; | |
111 | } | |
112 | ||
113 | return 0; | |
114 | } | |
115 | ||
cc783786 KC |
116 | /** |
117 | * of_fdt_is_big_endian - Return true if given node needs BE MMIO accesses | |
118 | * @blob: A device tree blob | |
119 | * @node: node to test | |
120 | * | |
121 | * Returns true if the node has a "big-endian" property, or if the kernel | |
122 | * was compiled for BE *and* the node has a "native-endian" property. | |
123 | * Returns false otherwise. | |
124 | */ | |
125 | bool of_fdt_is_big_endian(const void *blob, unsigned long node) | |
126 | { | |
127 | if (fdt_getprop(blob, node, "big-endian", NULL)) | |
128 | return true; | |
129 | if (IS_ENABLED(CONFIG_CPU_BIG_ENDIAN) && | |
130 | fdt_getprop(blob, node, "native-endian", NULL)) | |
131 | return true; | |
132 | return false; | |
133 | } | |
134 | ||
a4f740cf GL |
135 | /** |
136 | * of_fdt_match - Return true if node matches a list of compatible values | |
137 | */ | |
c972de14 | 138 | int of_fdt_match(const void *blob, unsigned long node, |
7b482c83 | 139 | const char *const *compat) |
a4f740cf GL |
140 | { |
141 | unsigned int tmp, score = 0; | |
142 | ||
143 | if (!compat) | |
144 | return 0; | |
145 | ||
146 | while (*compat) { | |
147 | tmp = of_fdt_is_compatible(blob, node, *compat); | |
148 | if (tmp && (score == 0 || (tmp < score))) | |
149 | score = tmp; | |
150 | compat++; | |
151 | } | |
152 | ||
153 | return score; | |
154 | } | |
155 | ||
44856819 | 156 | static void *unflatten_dt_alloc(void **mem, unsigned long size, |
bbd33931 GL |
157 | unsigned long align) |
158 | { | |
159 | void *res; | |
160 | ||
44856819 GL |
161 | *mem = PTR_ALIGN(*mem, align); |
162 | res = *mem; | |
bbd33931 GL |
163 | *mem += size; |
164 | ||
165 | return res; | |
166 | } | |
167 | ||
dfbd4c6e GS |
168 | static void populate_properties(const void *blob, |
169 | int offset, | |
170 | void **mem, | |
171 | struct device_node *np, | |
172 | const char *nodename, | |
5063e25a | 173 | bool dryrun) |
bbd33931 | 174 | { |
dfbd4c6e GS |
175 | struct property *pp, **pprev = NULL; |
176 | int cur; | |
177 | bool has_name = false; | |
178 | ||
179 | pprev = &np->properties; | |
180 | for (cur = fdt_first_property_offset(blob, offset); | |
181 | cur >= 0; | |
182 | cur = fdt_next_property_offset(blob, cur)) { | |
183 | const __be32 *val; | |
184 | const char *pname; | |
185 | u32 sz; | |
186 | ||
187 | val = fdt_getprop_by_offset(blob, cur, &pname, &sz); | |
188 | if (!val) { | |
606ad42a | 189 | pr_warn("Cannot locate property at 0x%x\n", cur); |
dfbd4c6e GS |
190 | continue; |
191 | } | |
192 | ||
193 | if (!pname) { | |
606ad42a | 194 | pr_warn("Cannot find property name at 0x%x\n", cur); |
dfbd4c6e GS |
195 | continue; |
196 | } | |
197 | ||
198 | if (!strcmp(pname, "name")) | |
199 | has_name = true; | |
200 | ||
201 | pp = unflatten_dt_alloc(mem, sizeof(struct property), | |
202 | __alignof__(struct property)); | |
203 | if (dryrun) | |
204 | continue; | |
205 | ||
206 | /* We accept flattened tree phandles either in | |
207 | * ePAPR-style "phandle" properties, or the | |
208 | * legacy "linux,phandle" properties. If both | |
209 | * appear and have different values, things | |
210 | * will get weird. Don't do that. | |
211 | */ | |
212 | if (!strcmp(pname, "phandle") || | |
213 | !strcmp(pname, "linux,phandle")) { | |
214 | if (!np->phandle) | |
215 | np->phandle = be32_to_cpup(val); | |
216 | } | |
217 | ||
218 | /* And we process the "ibm,phandle" property | |
219 | * used in pSeries dynamic device tree | |
220 | * stuff | |
221 | */ | |
222 | if (!strcmp(pname, "ibm,phandle")) | |
223 | np->phandle = be32_to_cpup(val); | |
224 | ||
225 | pp->name = (char *)pname; | |
226 | pp->length = sz; | |
227 | pp->value = (__be32 *)val; | |
228 | *pprev = pp; | |
229 | pprev = &pp->next; | |
230 | } | |
231 | ||
232 | /* With version 0x10 we may not have the name property, | |
233 | * recreate it here from the unit name if absent | |
234 | */ | |
235 | if (!has_name) { | |
236 | const char *p = nodename, *ps = p, *pa = NULL; | |
237 | int len; | |
238 | ||
239 | while (*p) { | |
240 | if ((*p) == '@') | |
241 | pa = p; | |
242 | else if ((*p) == '/') | |
243 | ps = p + 1; | |
244 | p++; | |
245 | } | |
246 | ||
247 | if (pa < ps) | |
248 | pa = p; | |
249 | len = (pa - ps) + 1; | |
250 | pp = unflatten_dt_alloc(mem, sizeof(struct property) + len, | |
251 | __alignof__(struct property)); | |
252 | if (!dryrun) { | |
253 | pp->name = "name"; | |
254 | pp->length = len; | |
255 | pp->value = pp + 1; | |
256 | *pprev = pp; | |
257 | pprev = &pp->next; | |
258 | memcpy(pp->value, ps, len - 1); | |
259 | ((char *)pp->value)[len - 1] = 0; | |
260 | pr_debug("fixed up name for %s -> %s\n", | |
261 | nodename, (char *)pp->value); | |
262 | } | |
263 | } | |
264 | ||
265 | if (!dryrun) | |
266 | *pprev = NULL; | |
267 | } | |
268 | ||
dddc33e5 GS |
269 | static unsigned int populate_node(const void *blob, |
270 | int offset, | |
271 | void **mem, | |
272 | struct device_node *dad, | |
273 | unsigned int fpsize, | |
274 | struct device_node **pnp, | |
275 | bool dryrun) | |
dfbd4c6e | 276 | { |
bbd33931 | 277 | struct device_node *np; |
e6a6928c | 278 | const char *pathp; |
bbd33931 | 279 | unsigned int l, allocl; |
bbd33931 GL |
280 | int new_format = 0; |
281 | ||
dfbd4c6e GS |
282 | pathp = fdt_get_name(blob, offset, &l); |
283 | if (!pathp) { | |
284 | *pnp = NULL; | |
285 | return 0; | |
286 | } | |
e6a6928c | 287 | |
05f4647b | 288 | allocl = ++l; |
bbd33931 GL |
289 | |
290 | /* version 0x10 has a more compact unit name here instead of the full | |
291 | * path. we accumulate the full path size using "fpsize", we'll rebuild | |
292 | * it later. We detect this because the first character of the name is | |
293 | * not '/'. | |
294 | */ | |
295 | if ((*pathp) != '/') { | |
296 | new_format = 1; | |
297 | if (fpsize == 0) { | |
298 | /* root node: special case. fpsize accounts for path | |
299 | * plus terminating zero. root node only has '/', so | |
300 | * fpsize should be 2, but we want to avoid the first | |
301 | * level nodes to have two '/' so we use fpsize 1 here | |
302 | */ | |
303 | fpsize = 1; | |
304 | allocl = 2; | |
0fca5dea | 305 | l = 1; |
e6a6928c | 306 | pathp = ""; |
bbd33931 GL |
307 | } else { |
308 | /* account for '/' and path size minus terminal 0 | |
309 | * already in 'l' | |
310 | */ | |
311 | fpsize += l; | |
312 | allocl = fpsize; | |
313 | } | |
314 | } | |
315 | ||
dfbd4c6e | 316 | np = unflatten_dt_alloc(mem, sizeof(struct device_node) + allocl, |
bbd33931 | 317 | __alignof__(struct device_node)); |
5063e25a | 318 | if (!dryrun) { |
c22618a1 | 319 | char *fn; |
0829f6d1 | 320 | of_node_init(np); |
c22618a1 | 321 | np->full_name = fn = ((char *)np) + sizeof(*np); |
bbd33931 | 322 | if (new_format) { |
bbd33931 GL |
323 | /* rebuild full path for new format */ |
324 | if (dad && dad->parent) { | |
325 | strcpy(fn, dad->full_name); | |
326 | #ifdef DEBUG | |
327 | if ((strlen(fn) + l + 1) != allocl) { | |
328 | pr_debug("%s: p: %d, l: %d, a: %d\n", | |
329 | pathp, (int)strlen(fn), | |
330 | l, allocl); | |
331 | } | |
332 | #endif | |
333 | fn += strlen(fn); | |
334 | } | |
335 | *(fn++) = '/'; | |
c22618a1 GL |
336 | } |
337 | memcpy(fn, pathp, l); | |
338 | ||
bbd33931 GL |
339 | if (dad != NULL) { |
340 | np->parent = dad; | |
70161ff3 GL |
341 | np->sibling = dad->child; |
342 | dad->child = np; | |
bbd33931 | 343 | } |
bbd33931 | 344 | } |
e6a6928c | 345 | |
dfbd4c6e | 346 | populate_properties(blob, offset, mem, np, pathp, dryrun); |
5063e25a | 347 | if (!dryrun) { |
bbd33931 GL |
348 | np->name = of_get_property(np, "name", NULL); |
349 | np->type = of_get_property(np, "device_type", NULL); | |
350 | ||
351 | if (!np->name) | |
352 | np->name = "<NULL>"; | |
353 | if (!np->type) | |
354 | np->type = "<NULL>"; | |
355 | } | |
e6a6928c | 356 | |
dfbd4c6e GS |
357 | *pnp = np; |
358 | return fpsize; | |
359 | } | |
360 | ||
50800082 GS |
361 | static void reverse_nodes(struct device_node *parent) |
362 | { | |
363 | struct device_node *child, *next; | |
364 | ||
365 | /* In-depth first */ | |
366 | child = parent->child; | |
367 | while (child) { | |
368 | reverse_nodes(child); | |
369 | ||
370 | child = child->sibling; | |
371 | } | |
372 | ||
373 | /* Reverse the nodes in the child list */ | |
374 | child = parent->child; | |
375 | parent->child = NULL; | |
376 | while (child) { | |
377 | next = child->sibling; | |
378 | ||
379 | child->sibling = parent->child; | |
380 | parent->child = child; | |
381 | child = next; | |
382 | } | |
383 | } | |
384 | ||
dfbd4c6e | 385 | /** |
947c82cb | 386 | * unflatten_dt_nodes - Alloc and populate a device_node from the flat tree |
dfbd4c6e GS |
387 | * @blob: The parent device tree blob |
388 | * @mem: Memory chunk to use for allocating device nodes and properties | |
dfbd4c6e GS |
389 | * @dad: Parent struct device_node |
390 | * @nodepp: The device_node tree created by the call | |
50800082 GS |
391 | * |
392 | * It returns the size of unflattened device tree or error code | |
dfbd4c6e | 393 | */ |
947c82cb GS |
394 | static int unflatten_dt_nodes(const void *blob, |
395 | void *mem, | |
396 | struct device_node *dad, | |
397 | struct device_node **nodepp) | |
dfbd4c6e | 398 | { |
50800082 | 399 | struct device_node *root; |
8c237cd0 | 400 | int offset = 0, depth = 0, initial_depth = 0; |
50800082 | 401 | #define FDT_MAX_DEPTH 64 |
dddc33e5 | 402 | unsigned int fpsizes[FDT_MAX_DEPTH]; |
50800082 GS |
403 | struct device_node *nps[FDT_MAX_DEPTH]; |
404 | void *base = mem; | |
405 | bool dryrun = !base; | |
dfbd4c6e | 406 | |
50800082 GS |
407 | if (nodepp) |
408 | *nodepp = NULL; | |
409 | ||
8c237cd0 GS |
410 | /* |
411 | * We're unflattening device sub-tree if @dad is valid. There are | |
412 | * possibly multiple nodes in the first level of depth. We need | |
413 | * set @depth to 1 to make fdt_next_node() happy as it bails | |
414 | * immediately when negative @depth is found. Otherwise, the device | |
415 | * nodes except the first one won't be unflattened successfully. | |
416 | */ | |
417 | if (dad) | |
418 | depth = initial_depth = 1; | |
419 | ||
50800082 GS |
420 | root = dad; |
421 | fpsizes[depth] = dad ? strlen(of_node_full_name(dad)) : 0; | |
78c44d91 | 422 | nps[depth] = dad; |
8c237cd0 | 423 | |
50800082 | 424 | for (offset = 0; |
8c237cd0 | 425 | offset >= 0 && depth >= initial_depth; |
50800082 GS |
426 | offset = fdt_next_node(blob, offset, &depth)) { |
427 | if (WARN_ON_ONCE(depth >= FDT_MAX_DEPTH)) | |
428 | continue; | |
dfbd4c6e | 429 | |
78c44d91 RK |
430 | fpsizes[depth+1] = populate_node(blob, offset, &mem, |
431 | nps[depth], | |
432 | fpsizes[depth], | |
433 | &nps[depth+1], dryrun); | |
434 | if (!fpsizes[depth+1]) | |
50800082 GS |
435 | return mem - base; |
436 | ||
437 | if (!dryrun && nodepp && !*nodepp) | |
78c44d91 | 438 | *nodepp = nps[depth+1]; |
50800082 | 439 | if (!dryrun && !root) |
78c44d91 | 440 | root = nps[depth+1]; |
50800082 | 441 | } |
e6a6928c | 442 | |
50800082 | 443 | if (offset < 0 && offset != -FDT_ERR_NOTFOUND) { |
606ad42a | 444 | pr_err("Error %d processing FDT\n", offset); |
50800082 GS |
445 | return -EINVAL; |
446 | } | |
e6a6928c | 447 | |
70161ff3 GL |
448 | /* |
449 | * Reverse the child list. Some drivers assumes node order matches .dts | |
450 | * node order | |
451 | */ | |
50800082 GS |
452 | if (!dryrun) |
453 | reverse_nodes(root); | |
e6a6928c | 454 | |
50800082 | 455 | return mem - base; |
bbd33931 | 456 | } |
41f88009 | 457 | |
fe140423 SN |
458 | /** |
459 | * __unflatten_device_tree - create tree of device_nodes from flat blob | |
460 | * | |
461 | * unflattens a device-tree, creating the | |
462 | * tree of struct device_node. It also fills the "name" and "type" | |
463 | * pointers of the nodes so the normal device-tree walking functions | |
464 | * can be used. | |
465 | * @blob: The blob to expand | |
c4263233 | 466 | * @dad: Parent device node |
fe140423 SN |
467 | * @mynodes: The device_node tree created by the call |
468 | * @dt_alloc: An allocator that provides a virtual address to memory | |
469 | * for the resulting tree | |
83262418 GS |
470 | * |
471 | * Returns NULL on failure or the memory chunk containing the unflattened | |
472 | * device tree on success. | |
fe140423 | 473 | */ |
81d0848f FR |
474 | void *__unflatten_device_tree(const void *blob, |
475 | struct device_node *dad, | |
476 | struct device_node **mynodes, | |
477 | void *(*dt_alloc)(u64 size, u64 align), | |
478 | bool detached) | |
fe140423 | 479 | { |
50800082 | 480 | int size; |
e6a6928c | 481 | void *mem; |
fe140423 SN |
482 | |
483 | pr_debug(" -> unflatten_device_tree()\n"); | |
484 | ||
485 | if (!blob) { | |
486 | pr_debug("No device tree pointer\n"); | |
83262418 | 487 | return NULL; |
fe140423 SN |
488 | } |
489 | ||
490 | pr_debug("Unflattening device tree:\n"); | |
c972de14 RH |
491 | pr_debug("magic: %08x\n", fdt_magic(blob)); |
492 | pr_debug("size: %08x\n", fdt_totalsize(blob)); | |
493 | pr_debug("version: %08x\n", fdt_version(blob)); | |
fe140423 | 494 | |
c972de14 | 495 | if (fdt_check_header(blob)) { |
fe140423 | 496 | pr_err("Invalid device tree blob header\n"); |
83262418 | 497 | return NULL; |
fe140423 SN |
498 | } |
499 | ||
500 | /* First pass, scan for size */ | |
c4263233 | 501 | size = unflatten_dt_nodes(blob, NULL, dad, NULL); |
50800082 | 502 | if (size < 0) |
83262418 | 503 | return NULL; |
fe140423 | 504 | |
50800082 GS |
505 | size = ALIGN(size, 4); |
506 | pr_debug(" size is %d, allocating...\n", size); | |
fe140423 SN |
507 | |
508 | /* Allocate memory for the expanded device tree */ | |
44856819 | 509 | mem = dt_alloc(size + 4, __alignof__(struct device_node)); |
49e67dd1 JH |
510 | if (!mem) |
511 | return NULL; | |
512 | ||
44856819 | 513 | memset(mem, 0, size); |
fe140423 | 514 | |
44856819 | 515 | *(__be32 *)(mem + size) = cpu_to_be32(0xdeadbeef); |
9e401275 | 516 | |
44856819 | 517 | pr_debug(" unflattening %p...\n", mem); |
fe140423 SN |
518 | |
519 | /* Second pass, do actual unflattening */ | |
c4263233 | 520 | unflatten_dt_nodes(blob, mem, dad, mynodes); |
44856819 | 521 | if (be32_to_cpup(mem + size) != 0xdeadbeef) |
fe140423 | 522 | pr_warning("End of tree marker overwritten: %08x\n", |
44856819 | 523 | be32_to_cpup(mem + size)); |
fe140423 | 524 | |
89c67752 | 525 | if (detached && mynodes) { |
1d1bde55 MS |
526 | of_node_set_flag(*mynodes, OF_DETACHED); |
527 | pr_debug("unflattened tree is detached\n"); | |
528 | } | |
529 | ||
fe140423 | 530 | pr_debug(" <- unflatten_device_tree()\n"); |
83262418 | 531 | return mem; |
fe140423 SN |
532 | } |
533 | ||
534 | static void *kernel_tree_alloc(u64 size, u64 align) | |
535 | { | |
536 | return kzalloc(size, GFP_KERNEL); | |
537 | } | |
538 | ||
f8062386 GR |
539 | static DEFINE_MUTEX(of_fdt_unflatten_mutex); |
540 | ||
fe140423 SN |
541 | /** |
542 | * of_fdt_unflatten_tree - create tree of device_nodes from flat blob | |
c4263233 GS |
543 | * @blob: Flat device tree blob |
544 | * @dad: Parent device node | |
545 | * @mynodes: The device tree created by the call | |
fe140423 SN |
546 | * |
547 | * unflattens the device-tree passed by the firmware, creating the | |
548 | * tree of struct device_node. It also fills the "name" and "type" | |
549 | * pointers of the nodes so the normal device-tree walking functions | |
550 | * can be used. | |
83262418 GS |
551 | * |
552 | * Returns NULL on failure or the memory chunk containing the unflattened | |
553 | * device tree on success. | |
fe140423 | 554 | */ |
83262418 GS |
555 | void *of_fdt_unflatten_tree(const unsigned long *blob, |
556 | struct device_node *dad, | |
557 | struct device_node **mynodes) | |
fe140423 | 558 | { |
83262418 GS |
559 | void *mem; |
560 | ||
f8062386 | 561 | mutex_lock(&of_fdt_unflatten_mutex); |
1d1bde55 MS |
562 | mem = __unflatten_device_tree(blob, dad, mynodes, &kernel_tree_alloc, |
563 | true); | |
f8062386 | 564 | mutex_unlock(&of_fdt_unflatten_mutex); |
83262418 GS |
565 | |
566 | return mem; | |
fe140423 SN |
567 | } |
568 | EXPORT_SYMBOL_GPL(of_fdt_unflatten_tree); | |
569 | ||
57d00ecf SN |
570 | /* Everything below here references initial_boot_params directly. */ |
571 | int __initdata dt_root_addr_cells; | |
572 | int __initdata dt_root_size_cells; | |
573 | ||
1daa0c4c | 574 | void *initial_boot_params; |
57d00ecf SN |
575 | |
576 | #ifdef CONFIG_OF_EARLY_FLATTREE | |
577 | ||
08d53aa5 AB |
578 | static u32 of_fdt_crc32; |
579 | ||
e8d9d1f5 MS |
580 | /** |
581 | * res_mem_reserve_reg() - reserve all memory described in 'reg' property | |
582 | */ | |
583 | static int __init __reserved_mem_reserve_reg(unsigned long node, | |
584 | const char *uname) | |
585 | { | |
586 | int t_len = (dt_root_addr_cells + dt_root_size_cells) * sizeof(__be32); | |
587 | phys_addr_t base, size; | |
9d0c4dfe RH |
588 | int len; |
589 | const __be32 *prop; | |
3f0c8206 | 590 | int nomap, first = 1; |
e8d9d1f5 MS |
591 | |
592 | prop = of_get_flat_dt_prop(node, "reg", &len); | |
593 | if (!prop) | |
594 | return -ENOENT; | |
595 | ||
596 | if (len && len % t_len != 0) { | |
597 | pr_err("Reserved memory: invalid reg property in '%s', skipping node.\n", | |
598 | uname); | |
599 | return -EINVAL; | |
600 | } | |
601 | ||
602 | nomap = of_get_flat_dt_prop(node, "no-map", NULL) != NULL; | |
603 | ||
604 | while (len >= t_len) { | |
605 | base = dt_mem_next_cell(dt_root_addr_cells, &prop); | |
606 | size = dt_mem_next_cell(dt_root_size_cells, &prop); | |
607 | ||
b5f2a8c0 | 608 | if (size && |
e8d9d1f5 MS |
609 | early_init_dt_reserve_memory_arch(base, size, nomap) == 0) |
610 | pr_debug("Reserved memory: reserved region for node '%s': base %pa, size %ld MiB\n", | |
611 | uname, &base, (unsigned long)size / SZ_1M); | |
612 | else | |
613 | pr_info("Reserved memory: failed to reserve memory for node '%s': base %pa, size %ld MiB\n", | |
614 | uname, &base, (unsigned long)size / SZ_1M); | |
615 | ||
616 | len -= t_len; | |
3f0c8206 MS |
617 | if (first) { |
618 | fdt_reserved_mem_save_node(node, uname, base, size); | |
619 | first = 0; | |
620 | } | |
e8d9d1f5 MS |
621 | } |
622 | return 0; | |
623 | } | |
624 | ||
625 | /** | |
626 | * __reserved_mem_check_root() - check if #size-cells, #address-cells provided | |
627 | * in /reserved-memory matches the values supported by the current implementation, | |
628 | * also check if ranges property has been provided | |
629 | */ | |
5b624118 | 630 | static int __init __reserved_mem_check_root(unsigned long node) |
e8d9d1f5 | 631 | { |
9d0c4dfe | 632 | const __be32 *prop; |
e8d9d1f5 MS |
633 | |
634 | prop = of_get_flat_dt_prop(node, "#size-cells", NULL); | |
635 | if (!prop || be32_to_cpup(prop) != dt_root_size_cells) | |
636 | return -EINVAL; | |
637 | ||
638 | prop = of_get_flat_dt_prop(node, "#address-cells", NULL); | |
639 | if (!prop || be32_to_cpup(prop) != dt_root_addr_cells) | |
640 | return -EINVAL; | |
641 | ||
642 | prop = of_get_flat_dt_prop(node, "ranges", NULL); | |
643 | if (!prop) | |
644 | return -EINVAL; | |
645 | return 0; | |
646 | } | |
647 | ||
648 | /** | |
649 | * fdt_scan_reserved_mem() - scan a single FDT node for reserved memory | |
650 | */ | |
651 | static int __init __fdt_scan_reserved_mem(unsigned long node, const char *uname, | |
652 | int depth, void *data) | |
653 | { | |
654 | static int found; | |
655 | const char *status; | |
3f0c8206 | 656 | int err; |
e8d9d1f5 MS |
657 | |
658 | if (!found && depth == 1 && strcmp(uname, "reserved-memory") == 0) { | |
659 | if (__reserved_mem_check_root(node) != 0) { | |
660 | pr_err("Reserved memory: unsupported node format, ignoring\n"); | |
661 | /* break scan */ | |
662 | return 1; | |
663 | } | |
664 | found = 1; | |
665 | /* scan next node */ | |
666 | return 0; | |
667 | } else if (!found) { | |
668 | /* scan next node */ | |
669 | return 0; | |
670 | } else if (found && depth < 2) { | |
671 | /* scanning of /reserved-memory has been finished */ | |
672 | return 1; | |
673 | } | |
674 | ||
675 | status = of_get_flat_dt_prop(node, "status", NULL); | |
676 | if (status && strcmp(status, "okay") != 0 && strcmp(status, "ok") != 0) | |
677 | return 0; | |
678 | ||
3f0c8206 MS |
679 | err = __reserved_mem_reserve_reg(node, uname); |
680 | if (err == -ENOENT && of_get_flat_dt_prop(node, "size", NULL)) | |
681 | fdt_reserved_mem_save_node(node, uname, 0, 0); | |
e8d9d1f5 MS |
682 | |
683 | /* scan next node */ | |
684 | return 0; | |
685 | } | |
686 | ||
687 | /** | |
688 | * early_init_fdt_scan_reserved_mem() - create reserved memory regions | |
689 | * | |
690 | * This function grabs memory from early allocator for device exclusive use | |
691 | * defined in device tree structures. It should be called by arch specific code | |
692 | * once the early allocator (i.e. memblock) has been fully activated. | |
693 | */ | |
694 | void __init early_init_fdt_scan_reserved_mem(void) | |
695 | { | |
d1552ce4 RH |
696 | int n; |
697 | u64 base, size; | |
698 | ||
2040b527 JC |
699 | if (!initial_boot_params) |
700 | return; | |
701 | ||
d1552ce4 RH |
702 | /* Process header /memreserve/ fields */ |
703 | for (n = 0; ; n++) { | |
704 | fdt_get_mem_rsv(initial_boot_params, n, &base, &size); | |
705 | if (!size) | |
706 | break; | |
707 | early_init_dt_reserve_memory_arch(base, size, 0); | |
708 | } | |
709 | ||
e8d9d1f5 | 710 | of_scan_flat_dt(__fdt_scan_reserved_mem, NULL); |
3f0c8206 | 711 | fdt_init_reserved_mem(); |
e8d9d1f5 MS |
712 | } |
713 | ||
24bbd929 AB |
714 | /** |
715 | * early_init_fdt_reserve_self() - reserve the memory used by the FDT blob | |
716 | */ | |
717 | void __init early_init_fdt_reserve_self(void) | |
718 | { | |
719 | if (!initial_boot_params) | |
720 | return; | |
721 | ||
722 | /* Reserve the dtb region */ | |
723 | early_init_dt_reserve_memory_arch(__pa(initial_boot_params), | |
724 | fdt_totalsize(initial_boot_params), | |
725 | 0); | |
726 | } | |
727 | ||
57d00ecf SN |
728 | /** |
729 | * of_scan_flat_dt - scan flattened tree blob and call callback on each. | |
730 | * @it: callback function | |
731 | * @data: context data pointer | |
732 | * | |
733 | * This function is used to scan the flattened device-tree, it is | |
734 | * used to extract the memory information at boot before we can | |
735 | * unflatten the tree | |
736 | */ | |
737 | int __init of_scan_flat_dt(int (*it)(unsigned long node, | |
738 | const char *uname, int depth, | |
739 | void *data), | |
740 | void *data) | |
741 | { | |
e6a6928c RH |
742 | const void *blob = initial_boot_params; |
743 | const char *pathp; | |
744 | int offset, rc = 0, depth = -1; | |
745 | ||
3ec75441 TW |
746 | if (!blob) |
747 | return 0; | |
748 | ||
749 | for (offset = fdt_next_node(blob, -1, &depth); | |
750 | offset >= 0 && depth >= 0 && !rc; | |
751 | offset = fdt_next_node(blob, offset, &depth)) { | |
e6a6928c RH |
752 | |
753 | pathp = fdt_get_name(blob, offset, NULL); | |
375da3a7 AS |
754 | if (*pathp == '/') |
755 | pathp = kbasename(pathp); | |
e6a6928c RH |
756 | rc = it(offset, pathp, depth, data); |
757 | } | |
57d00ecf SN |
758 | return rc; |
759 | } | |
760 | ||
ea47dd19 NP |
761 | /** |
762 | * of_scan_flat_dt_subnodes - scan sub-nodes of a node call callback on each. | |
763 | * @it: callback function | |
764 | * @data: context data pointer | |
765 | * | |
766 | * This function is used to scan sub-nodes of a node. | |
767 | */ | |
768 | int __init of_scan_flat_dt_subnodes(unsigned long parent, | |
769 | int (*it)(unsigned long node, | |
770 | const char *uname, | |
771 | void *data), | |
772 | void *data) | |
773 | { | |
774 | const void *blob = initial_boot_params; | |
775 | int node; | |
776 | ||
777 | fdt_for_each_subnode(node, blob, parent) { | |
778 | const char *pathp; | |
779 | int rc; | |
780 | ||
781 | pathp = fdt_get_name(blob, node, NULL); | |
782 | if (*pathp == '/') | |
783 | pathp = kbasename(pathp); | |
784 | rc = it(node, pathp, data); | |
785 | if (rc) | |
786 | return rc; | |
787 | } | |
788 | return 0; | |
789 | } | |
790 | ||
9c609868 SZ |
791 | /** |
792 | * of_get_flat_dt_subnode_by_name - get the subnode by given name | |
793 | * | |
794 | * @node: the parent node | |
795 | * @uname: the name of subnode | |
796 | * @return offset of the subnode, or -FDT_ERR_NOTFOUND if there is none | |
797 | */ | |
798 | ||
799 | int of_get_flat_dt_subnode_by_name(unsigned long node, const char *uname) | |
800 | { | |
801 | return fdt_subnode_offset(initial_boot_params, node, uname); | |
802 | } | |
803 | ||
57d00ecf SN |
804 | /** |
805 | * of_get_flat_dt_root - find the root node in the flat blob | |
806 | */ | |
807 | unsigned long __init of_get_flat_dt_root(void) | |
808 | { | |
e6a6928c | 809 | return 0; |
57d00ecf SN |
810 | } |
811 | ||
c0556d3f RH |
812 | /** |
813 | * of_get_flat_dt_size - Return the total size of the FDT | |
814 | */ | |
815 | int __init of_get_flat_dt_size(void) | |
816 | { | |
817 | return fdt_totalsize(initial_boot_params); | |
818 | } | |
819 | ||
57d00ecf SN |
820 | /** |
821 | * of_get_flat_dt_prop - Given a node in the flat blob, return the property ptr | |
822 | * | |
823 | * This function can be used within scan_flattened_dt callback to get | |
824 | * access to properties | |
825 | */ | |
9d0c4dfe RH |
826 | const void *__init of_get_flat_dt_prop(unsigned long node, const char *name, |
827 | int *size) | |
57d00ecf | 828 | { |
e6a6928c | 829 | return fdt_getprop(initial_boot_params, node, name, size); |
57d00ecf SN |
830 | } |
831 | ||
832 | /** | |
833 | * of_flat_dt_is_compatible - Return true if given node has compat in compatible list | |
834 | * @node: node to test | |
835 | * @compat: compatible string to compare with compatible list. | |
836 | */ | |
837 | int __init of_flat_dt_is_compatible(unsigned long node, const char *compat) | |
838 | { | |
839 | return of_fdt_is_compatible(initial_boot_params, node, compat); | |
840 | } | |
841 | ||
a4f740cf GL |
842 | /** |
843 | * of_flat_dt_match - Return true if node matches a list of compatible values | |
844 | */ | |
7b482c83 | 845 | int __init of_flat_dt_match(unsigned long node, const char *const *compat) |
a4f740cf GL |
846 | { |
847 | return of_fdt_match(initial_boot_params, node, compat); | |
848 | } | |
849 | ||
ea47dd19 NP |
850 | /** |
851 | * of_get_flat_dt_prop - Given a node in the flat blob, return the phandle | |
852 | */ | |
853 | uint32_t __init of_get_flat_dt_phandle(unsigned long node) | |
854 | { | |
855 | return fdt_get_phandle(initial_boot_params, node); | |
856 | } | |
857 | ||
57d74bcf MS |
858 | struct fdt_scan_status { |
859 | const char *name; | |
860 | int namelen; | |
861 | int depth; | |
862 | int found; | |
863 | int (*iterator)(unsigned long node, const char *uname, int depth, void *data); | |
864 | void *data; | |
865 | }; | |
866 | ||
6a903a25 RH |
867 | const char * __init of_flat_dt_get_machine_name(void) |
868 | { | |
869 | const char *name; | |
870 | unsigned long dt_root = of_get_flat_dt_root(); | |
871 | ||
872 | name = of_get_flat_dt_prop(dt_root, "model", NULL); | |
873 | if (!name) | |
874 | name = of_get_flat_dt_prop(dt_root, "compatible", NULL); | |
875 | return name; | |
876 | } | |
877 | ||
878 | /** | |
879 | * of_flat_dt_match_machine - Iterate match tables to find matching machine. | |
880 | * | |
881 | * @default_match: A machine specific ptr to return in case of no match. | |
882 | * @get_next_compat: callback function to return next compatible match table. | |
883 | * | |
884 | * Iterate through machine match tables to find the best match for the machine | |
885 | * compatible string in the FDT. | |
886 | */ | |
887 | const void * __init of_flat_dt_match_machine(const void *default_match, | |
888 | const void * (*get_next_compat)(const char * const**)) | |
889 | { | |
890 | const void *data = NULL; | |
891 | const void *best_data = default_match; | |
892 | const char *const *compat; | |
893 | unsigned long dt_root; | |
894 | unsigned int best_score = ~1, score = 0; | |
895 | ||
896 | dt_root = of_get_flat_dt_root(); | |
897 | while ((data = get_next_compat(&compat))) { | |
898 | score = of_flat_dt_match(dt_root, compat); | |
899 | if (score > 0 && score < best_score) { | |
900 | best_data = data; | |
901 | best_score = score; | |
902 | } | |
903 | } | |
904 | if (!best_data) { | |
905 | const char *prop; | |
9d0c4dfe | 906 | int size; |
6a903a25 RH |
907 | |
908 | pr_err("\n unrecognized device tree list:\n[ "); | |
909 | ||
910 | prop = of_get_flat_dt_prop(dt_root, "compatible", &size); | |
911 | if (prop) { | |
912 | while (size > 0) { | |
913 | printk("'%s' ", prop); | |
914 | size -= strlen(prop) + 1; | |
915 | prop += strlen(prop) + 1; | |
916 | } | |
917 | } | |
918 | printk("]\n\n"); | |
919 | return NULL; | |
920 | } | |
921 | ||
922 | pr_info("Machine model: %s\n", of_flat_dt_get_machine_name()); | |
923 | ||
924 | return best_data; | |
925 | } | |
926 | ||
f7b3a835 | 927 | #ifdef CONFIG_BLK_DEV_INITRD |
369bc9ab AB |
928 | #ifndef __early_init_dt_declare_initrd |
929 | static void __early_init_dt_declare_initrd(unsigned long start, | |
930 | unsigned long end) | |
931 | { | |
932 | initrd_start = (unsigned long)__va(start); | |
933 | initrd_end = (unsigned long)__va(end); | |
934 | initrd_below_start_ok = 1; | |
935 | } | |
936 | #endif | |
937 | ||
f7b3a835 GL |
938 | /** |
939 | * early_init_dt_check_for_initrd - Decode initrd location from flat tree | |
940 | * @node: reference to node containing initrd location ('chosen') | |
941 | */ | |
29eb45a9 | 942 | static void __init early_init_dt_check_for_initrd(unsigned long node) |
f7b3a835 | 943 | { |
374d5c99 | 944 | u64 start, end; |
9d0c4dfe RH |
945 | int len; |
946 | const __be32 *prop; | |
f7b3a835 GL |
947 | |
948 | pr_debug("Looking for initrd properties... "); | |
949 | ||
950 | prop = of_get_flat_dt_prop(node, "linux,initrd-start", &len); | |
1406bc2f JK |
951 | if (!prop) |
952 | return; | |
374d5c99 | 953 | start = of_read_number(prop, len/4); |
1406bc2f JK |
954 | |
955 | prop = of_get_flat_dt_prop(node, "linux,initrd-end", &len); | |
956 | if (!prop) | |
957 | return; | |
374d5c99 | 958 | end = of_read_number(prop, len/4); |
f7b3a835 | 959 | |
369bc9ab | 960 | __early_init_dt_declare_initrd(start, end); |
29eb45a9 | 961 | |
374d5c99 SS |
962 | pr_debug("initrd_start=0x%llx initrd_end=0x%llx\n", |
963 | (unsigned long long)start, (unsigned long long)end); | |
f7b3a835 GL |
964 | } |
965 | #else | |
29eb45a9 | 966 | static inline void early_init_dt_check_for_initrd(unsigned long node) |
f7b3a835 GL |
967 | { |
968 | } | |
969 | #endif /* CONFIG_BLK_DEV_INITRD */ | |
970 | ||
fb11ffe7 | 971 | #ifdef CONFIG_SERIAL_EARLYCON |
fb11ffe7 | 972 | |
d503187b | 973 | int __init early_init_dt_scan_chosen_stdout(void) |
fb11ffe7 RH |
974 | { |
975 | int offset; | |
4d118c9a | 976 | const char *p, *q, *options = NULL; |
fb11ffe7 | 977 | int l; |
2eaa7909 | 978 | const struct earlycon_id *match; |
fb11ffe7 RH |
979 | const void *fdt = initial_boot_params; |
980 | ||
981 | offset = fdt_path_offset(fdt, "/chosen"); | |
982 | if (offset < 0) | |
983 | offset = fdt_path_offset(fdt, "/chosen@0"); | |
984 | if (offset < 0) | |
985 | return -ENOENT; | |
986 | ||
987 | p = fdt_getprop(fdt, offset, "stdout-path", &l); | |
988 | if (!p) | |
989 | p = fdt_getprop(fdt, offset, "linux,stdout-path", &l); | |
990 | if (!p || !l) | |
991 | return -ENOENT; | |
992 | ||
4d118c9a PH |
993 | q = strchrnul(p, ':'); |
994 | if (*q != '\0') | |
995 | options = q + 1; | |
0fcc286f | 996 | l = q - p; |
6296ad9e | 997 | |
fb11ffe7 | 998 | /* Get the node specified by stdout-path */ |
0fcc286f PH |
999 | offset = fdt_path_offset_namelen(fdt, p, l); |
1000 | if (offset < 0) { | |
1001 | pr_warn("earlycon: stdout-path %.*s not found\n", l, p); | |
1002 | return 0; | |
1003 | } | |
fb11ffe7 | 1004 | |
2eaa7909 | 1005 | for (match = __earlycon_table; match < __earlycon_table_end; match++) { |
2eaa7909 PH |
1006 | if (!match->compatible[0]) |
1007 | continue; | |
1008 | ||
1009 | if (fdt_node_check_compatible(fdt, offset, match->compatible)) | |
fb11ffe7 | 1010 | continue; |
fb11ffe7 | 1011 | |
c90fe9c0 | 1012 | of_setup_earlycon(match, offset, options); |
fb11ffe7 RH |
1013 | return 0; |
1014 | } | |
1015 | return -ENODEV; | |
1016 | } | |
fb11ffe7 RH |
1017 | #endif |
1018 | ||
f00abd94 GL |
1019 | /** |
1020 | * early_init_dt_scan_root - fetch the top level address and size cells | |
1021 | */ | |
1022 | int __init early_init_dt_scan_root(unsigned long node, const char *uname, | |
1023 | int depth, void *data) | |
1024 | { | |
9d0c4dfe | 1025 | const __be32 *prop; |
f00abd94 GL |
1026 | |
1027 | if (depth != 0) | |
1028 | return 0; | |
1029 | ||
33714881 JK |
1030 | dt_root_size_cells = OF_ROOT_NODE_SIZE_CELLS_DEFAULT; |
1031 | dt_root_addr_cells = OF_ROOT_NODE_ADDR_CELLS_DEFAULT; | |
1032 | ||
f00abd94 | 1033 | prop = of_get_flat_dt_prop(node, "#size-cells", NULL); |
33714881 JK |
1034 | if (prop) |
1035 | dt_root_size_cells = be32_to_cpup(prop); | |
f00abd94 GL |
1036 | pr_debug("dt_root_size_cells = %x\n", dt_root_size_cells); |
1037 | ||
1038 | prop = of_get_flat_dt_prop(node, "#address-cells", NULL); | |
33714881 JK |
1039 | if (prop) |
1040 | dt_root_addr_cells = be32_to_cpup(prop); | |
f00abd94 GL |
1041 | pr_debug("dt_root_addr_cells = %x\n", dt_root_addr_cells); |
1042 | ||
1043 | /* break now */ | |
1044 | return 1; | |
1045 | } | |
1046 | ||
9d0c4dfe | 1047 | u64 __init dt_mem_next_cell(int s, const __be32 **cellp) |
83f7a06e | 1048 | { |
9d0c4dfe | 1049 | const __be32 *p = *cellp; |
83f7a06e GL |
1050 | |
1051 | *cellp = p + s; | |
1052 | return of_read_number(p, s); | |
1053 | } | |
1054 | ||
51975db0 GL |
1055 | /** |
1056 | * early_init_dt_scan_memory - Look for an parse memory nodes | |
1057 | */ | |
1058 | int __init early_init_dt_scan_memory(unsigned long node, const char *uname, | |
1059 | int depth, void *data) | |
1060 | { | |
9d0c4dfe RH |
1061 | const char *type = of_get_flat_dt_prop(node, "device_type", NULL); |
1062 | const __be32 *reg, *endp; | |
1063 | int l; | |
41a9ada3 | 1064 | bool hotpluggable; |
51975db0 GL |
1065 | |
1066 | /* We are scanning "memory" nodes only */ | |
1067 | if (type == NULL) { | |
1068 | /* | |
1069 | * The longtrail doesn't have a device_type on the | |
1070 | * /memory node, so look for the node called /memory@0. | |
1071 | */ | |
b44aa25d | 1072 | if (!IS_ENABLED(CONFIG_PPC32) || depth != 1 || strcmp(uname, "memory@0") != 0) |
51975db0 GL |
1073 | return 0; |
1074 | } else if (strcmp(type, "memory") != 0) | |
1075 | return 0; | |
1076 | ||
1077 | reg = of_get_flat_dt_prop(node, "linux,usable-memory", &l); | |
1078 | if (reg == NULL) | |
1079 | reg = of_get_flat_dt_prop(node, "reg", &l); | |
1080 | if (reg == NULL) | |
1081 | return 0; | |
1082 | ||
1083 | endp = reg + (l / sizeof(__be32)); | |
41a9ada3 | 1084 | hotpluggable = of_get_flat_dt_prop(node, "hotpluggable", NULL); |
51975db0 | 1085 | |
c954b36e | 1086 | pr_debug("memory scan node %s, reg size %d,\n", uname, l); |
51975db0 GL |
1087 | |
1088 | while ((endp - reg) >= (dt_root_addr_cells + dt_root_size_cells)) { | |
1089 | u64 base, size; | |
1090 | ||
1091 | base = dt_mem_next_cell(dt_root_addr_cells, ®); | |
1092 | size = dt_mem_next_cell(dt_root_size_cells, ®); | |
1093 | ||
1094 | if (size == 0) | |
1095 | continue; | |
1096 | pr_debug(" - %llx , %llx\n", (unsigned long long)base, | |
1097 | (unsigned long long)size); | |
1098 | ||
1099 | early_init_dt_add_memory_arch(base, size); | |
41a9ada3 RA |
1100 | |
1101 | if (!hotpluggable) | |
1102 | continue; | |
1103 | ||
1104 | if (early_init_dt_mark_hotplug_memory_arch(base, size)) | |
1105 | pr_warn("failed to mark hotplug range 0x%llx - 0x%llx\n", | |
1106 | base, base + size); | |
51975db0 GL |
1107 | } |
1108 | ||
1109 | return 0; | |
1110 | } | |
1111 | ||
86e03221 GL |
1112 | int __init early_init_dt_scan_chosen(unsigned long node, const char *uname, |
1113 | int depth, void *data) | |
1114 | { | |
9d0c4dfe RH |
1115 | int l; |
1116 | const char *p; | |
86e03221 GL |
1117 | |
1118 | pr_debug("search \"chosen\", depth: %d, uname: %s\n", depth, uname); | |
1119 | ||
85f60ae4 | 1120 | if (depth != 1 || !data || |
86e03221 GL |
1121 | (strcmp(uname, "chosen") != 0 && strcmp(uname, "chosen@0") != 0)) |
1122 | return 0; | |
1123 | ||
1124 | early_init_dt_check_for_initrd(node); | |
1125 | ||
25985edc | 1126 | /* Retrieve command line */ |
86e03221 GL |
1127 | p = of_get_flat_dt_prop(node, "bootargs", &l); |
1128 | if (p != NULL && l > 0) | |
85f60ae4 | 1129 | strlcpy(data, p, min((int)l, COMMAND_LINE_SIZE)); |
86e03221 | 1130 | |
78b782cb BH |
1131 | /* |
1132 | * CONFIG_CMDLINE is meant to be a default in case nothing else | |
1133 | * managed to set the command line, unless CONFIG_CMDLINE_FORCE | |
1134 | * is set in which case we override whatever was found earlier. | |
1135 | */ | |
86e03221 | 1136 | #ifdef CONFIG_CMDLINE |
34b82026 MU |
1137 | #if defined(CONFIG_CMDLINE_EXTEND) |
1138 | strlcat(data, " ", COMMAND_LINE_SIZE); | |
1139 | strlcat(data, CONFIG_CMDLINE, COMMAND_LINE_SIZE); | |
1140 | #elif defined(CONFIG_CMDLINE_FORCE) | |
1141 | strlcpy(data, CONFIG_CMDLINE, COMMAND_LINE_SIZE); | |
1142 | #else | |
1143 | /* No arguments from boot loader, use kernel's cmdl*/ | |
78b782cb | 1144 | if (!((char *)data)[0]) |
85f60ae4 | 1145 | strlcpy(data, CONFIG_CMDLINE, COMMAND_LINE_SIZE); |
34b82026 | 1146 | #endif |
86e03221 GL |
1147 | #endif /* CONFIG_CMDLINE */ |
1148 | ||
85f60ae4 | 1149 | pr_debug("Command line is: %s\n", (char*)data); |
86e03221 GL |
1150 | |
1151 | /* break now */ | |
1152 | return 1; | |
1153 | } | |
1154 | ||
a1727da5 | 1155 | #ifdef CONFIG_HAVE_MEMBLOCK |
270522a0 AB |
1156 | #ifndef MIN_MEMBLOCK_ADDR |
1157 | #define MIN_MEMBLOCK_ADDR __pa(PAGE_OFFSET) | |
1158 | #endif | |
8eafeb48 AB |
1159 | #ifndef MAX_MEMBLOCK_ADDR |
1160 | #define MAX_MEMBLOCK_ADDR ((phys_addr_t)~0) | |
1161 | #endif | |
3069f0c0 | 1162 | |
068f6310 RH |
1163 | void __init __weak early_init_dt_add_memory_arch(u64 base, u64 size) |
1164 | { | |
270522a0 | 1165 | const u64 phys_offset = MIN_MEMBLOCK_ADDR; |
8f73d4b7 GU |
1166 | |
1167 | if (!PAGE_ALIGNED(base)) { | |
8cccffc5 AB |
1168 | if (size < PAGE_SIZE - (base & ~PAGE_MASK)) { |
1169 | pr_warn("Ignoring memory block 0x%llx - 0x%llx\n", | |
1170 | base, base + size); | |
1171 | return; | |
1172 | } | |
8f73d4b7 GU |
1173 | size -= PAGE_SIZE - (base & ~PAGE_MASK); |
1174 | base = PAGE_ALIGN(base); | |
1175 | } | |
068f6310 | 1176 | size &= PAGE_MASK; |
a67a6ed1 | 1177 | |
8eafeb48 | 1178 | if (base > MAX_MEMBLOCK_ADDR) { |
3069f0c0 LA |
1179 | pr_warning("Ignoring memory block 0x%llx - 0x%llx\n", |
1180 | base, base + size); | |
1181 | return; | |
1182 | } | |
a67a6ed1 | 1183 | |
8eafeb48 | 1184 | if (base + size - 1 > MAX_MEMBLOCK_ADDR) { |
9aacd602 | 1185 | pr_warning("Ignoring memory range 0x%llx - 0x%llx\n", |
8eafeb48 AB |
1186 | ((u64)MAX_MEMBLOCK_ADDR) + 1, base + size); |
1187 | size = MAX_MEMBLOCK_ADDR - base + 1; | |
a67a6ed1 LA |
1188 | } |
1189 | ||
068f6310 RH |
1190 | if (base + size < phys_offset) { |
1191 | pr_warning("Ignoring memory block 0x%llx - 0x%llx\n", | |
1192 | base, base + size); | |
1193 | return; | |
1194 | } | |
1195 | if (base < phys_offset) { | |
1196 | pr_warning("Ignoring memory range 0x%llx - 0x%llx\n", | |
1197 | base, phys_offset); | |
1198 | size -= phys_offset - base; | |
1199 | base = phys_offset; | |
1200 | } | |
1201 | memblock_add(base, size); | |
1202 | } | |
1203 | ||
41a9ada3 RA |
1204 | int __init __weak early_init_dt_mark_hotplug_memory_arch(u64 base, u64 size) |
1205 | { | |
1206 | return memblock_mark_hotplug(base, size); | |
1207 | } | |
1208 | ||
e8d9d1f5 MS |
1209 | int __init __weak early_init_dt_reserve_memory_arch(phys_addr_t base, |
1210 | phys_addr_t size, bool nomap) | |
1211 | { | |
e8d9d1f5 MS |
1212 | if (nomap) |
1213 | return memblock_remove(base, size); | |
1214 | return memblock_reserve(base, size); | |
1215 | } | |
1216 | ||
a1727da5 GL |
1217 | /* |
1218 | * called from unflatten_device_tree() to bootstrap devicetree itself | |
1219 | * Architectures can override this definition if memblock isn't used | |
1220 | */ | |
1221 | void * __init __weak early_init_dt_alloc_memory_arch(u64 size, u64 align) | |
1222 | { | |
1223 | return __va(memblock_alloc(size, align)); | |
1224 | } | |
e8d9d1f5 | 1225 | #else |
aefc7ec2 RH |
1226 | void __init __weak early_init_dt_add_memory_arch(u64 base, u64 size) |
1227 | { | |
1228 | WARN_ON(1); | |
1229 | } | |
1230 | ||
41a9ada3 RA |
1231 | int __init __weak early_init_dt_mark_hotplug_memory_arch(u64 base, u64 size) |
1232 | { | |
1233 | return -ENOSYS; | |
1234 | } | |
1235 | ||
e8d9d1f5 MS |
1236 | int __init __weak early_init_dt_reserve_memory_arch(phys_addr_t base, |
1237 | phys_addr_t size, bool nomap) | |
1238 | { | |
78bb2abe | 1239 | pr_err("Reserved memory not supported, ignoring range %pa - %pa%s\n", |
1d1a661d | 1240 | &base, &size, nomap ? " (nomap)" : ""); |
e8d9d1f5 MS |
1241 | return -ENOSYS; |
1242 | } | |
aefc7ec2 RH |
1243 | |
1244 | void * __init __weak early_init_dt_alloc_memory_arch(u64 size, u64 align) | |
1245 | { | |
1246 | WARN_ON(1); | |
1247 | return NULL; | |
1248 | } | |
a1727da5 GL |
1249 | #endif |
1250 | ||
4972a74b | 1251 | bool __init early_init_dt_verify(void *params) |
0288ffcb RH |
1252 | { |
1253 | if (!params) | |
1254 | return false; | |
1255 | ||
0288ffcb | 1256 | /* check device tree validity */ |
50ba08f3 | 1257 | if (fdt_check_header(params)) |
0288ffcb | 1258 | return false; |
0288ffcb | 1259 | |
50ba08f3 BH |
1260 | /* Setup flat device-tree pointer */ |
1261 | initial_boot_params = params; | |
08d53aa5 AB |
1262 | of_fdt_crc32 = crc32_be(~0, initial_boot_params, |
1263 | fdt_totalsize(initial_boot_params)); | |
4972a74b LA |
1264 | return true; |
1265 | } | |
1266 | ||
1267 | ||
1268 | void __init early_init_dt_scan_nodes(void) | |
1269 | { | |
0288ffcb RH |
1270 | /* Retrieve various information from the /chosen node */ |
1271 | of_scan_flat_dt(early_init_dt_scan_chosen, boot_command_line); | |
1272 | ||
1273 | /* Initialize {size,address}-cells info */ | |
1274 | of_scan_flat_dt(early_init_dt_scan_root, NULL); | |
1275 | ||
1276 | /* Setup memory, calling early_init_dt_add_memory_arch */ | |
1277 | of_scan_flat_dt(early_init_dt_scan_memory, NULL); | |
4972a74b LA |
1278 | } |
1279 | ||
1280 | bool __init early_init_dt_scan(void *params) | |
1281 | { | |
1282 | bool status; | |
1283 | ||
1284 | status = early_init_dt_verify(params); | |
1285 | if (!status) | |
1286 | return false; | |
0288ffcb | 1287 | |
4972a74b | 1288 | early_init_dt_scan_nodes(); |
0288ffcb RH |
1289 | return true; |
1290 | } | |
1291 | ||
41f88009 GL |
1292 | /** |
1293 | * unflatten_device_tree - create tree of device_nodes from flat blob | |
1294 | * | |
1295 | * unflattens the device-tree passed by the firmware, creating the | |
1296 | * tree of struct device_node. It also fills the "name" and "type" | |
1297 | * pointers of the nodes so the normal device-tree walking functions | |
1298 | * can be used. | |
1299 | */ | |
1300 | void __init unflatten_device_tree(void) | |
1301 | { | |
c4263233 | 1302 | __unflatten_device_tree(initial_boot_params, NULL, &of_root, |
1d1bde55 | 1303 | early_init_dt_alloc_memory_arch, false); |
41f88009 | 1304 | |
4c7d6361 | 1305 | /* Get pointer to "/chosen" and "/aliases" nodes for use everywhere */ |
611cad72 | 1306 | of_alias_scan(early_init_dt_alloc_memory_arch); |
81d0848f FR |
1307 | |
1308 | unittest_unflatten_overlay_base(); | |
41f88009 | 1309 | } |
e6ce1324 | 1310 | |
a8bf7527 RH |
1311 | /** |
1312 | * unflatten_and_copy_device_tree - copy and create tree of device_nodes from flat blob | |
1313 | * | |
1314 | * Copies and unflattens the device-tree passed by the firmware, creating the | |
1315 | * tree of struct device_node. It also fills the "name" and "type" | |
1316 | * pointers of the nodes so the normal device-tree walking functions | |
1317 | * can be used. This should only be used when the FDT memory has not been | |
1318 | * reserved such is the case when the FDT is built-in to the kernel init | |
1319 | * section. If the FDT memory is reserved already then unflatten_device_tree | |
1320 | * should be used instead. | |
1321 | */ | |
1322 | void __init unflatten_and_copy_device_tree(void) | |
1323 | { | |
6f041e99 JH |
1324 | int size; |
1325 | void *dt; | |
1326 | ||
1327 | if (!initial_boot_params) { | |
1328 | pr_warn("No valid device tree found, continuing without\n"); | |
1329 | return; | |
1330 | } | |
1331 | ||
c972de14 | 1332 | size = fdt_totalsize(initial_boot_params); |
6f041e99 | 1333 | dt = early_init_dt_alloc_memory_arch(size, |
c972de14 | 1334 | roundup_pow_of_two(FDT_V17_SIZE)); |
a8bf7527 RH |
1335 | |
1336 | if (dt) { | |
1337 | memcpy(dt, initial_boot_params, size); | |
1338 | initial_boot_params = dt; | |
1339 | } | |
1340 | unflatten_device_tree(); | |
1341 | } | |
1342 | ||
08d53aa5 AB |
1343 | #ifdef CONFIG_SYSFS |
1344 | static ssize_t of_fdt_raw_read(struct file *filp, struct kobject *kobj, | |
1345 | struct bin_attribute *bin_attr, | |
1346 | char *buf, loff_t off, size_t count) | |
b0a6fb36 | 1347 | { |
08d53aa5 AB |
1348 | memcpy(buf, initial_boot_params + off, count); |
1349 | return count; | |
1350 | } | |
b0a6fb36 | 1351 | |
08d53aa5 AB |
1352 | static int __init of_fdt_raw_init(void) |
1353 | { | |
1354 | static struct bin_attribute of_fdt_raw_attr = | |
1355 | __BIN_ATTR(fdt, S_IRUSR, of_fdt_raw_read, NULL, 0); | |
b0a6fb36 | 1356 | |
08d53aa5 AB |
1357 | if (!initial_boot_params) |
1358 | return 0; | |
b0a6fb36 | 1359 | |
08d53aa5 AB |
1360 | if (of_fdt_crc32 != crc32_be(~0, initial_boot_params, |
1361 | fdt_totalsize(initial_boot_params))) { | |
606ad42a | 1362 | pr_warn("not creating '/sys/firmware/fdt': CRC check failed\n"); |
08d53aa5 AB |
1363 | return 0; |
1364 | } | |
1365 | of_fdt_raw_attr.size = fdt_totalsize(initial_boot_params); | |
1366 | return sysfs_create_bin_file(firmware_kobj, &of_fdt_raw_attr); | |
b0a6fb36 | 1367 | } |
08d53aa5 | 1368 | late_initcall(of_fdt_raw_init); |
b0a6fb36 RH |
1369 | #endif |
1370 | ||
e6ce1324 | 1371 | #endif /* CONFIG_OF_EARLY_FLATTREE */ |