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> |
f8062386 | 16 | #include <linux/mutex.h> |
e169cfbe GL |
17 | #include <linux/of.h> |
18 | #include <linux/of_fdt.h> | |
3f0c8206 | 19 | #include <linux/of_reserved_mem.h> |
e8d9d1f5 | 20 | #include <linux/sizes.h> |
4ef7b373 JK |
21 | #include <linux/string.h> |
22 | #include <linux/errno.h> | |
fe140423 | 23 | #include <linux/slab.h> |
e6a6928c | 24 | #include <linux/libfdt.h> |
b0a6fb36 | 25 | #include <linux/debugfs.h> |
fb11ffe7 | 26 | #include <linux/serial_core.h> |
08d53aa5 | 27 | #include <linux/sysfs.h> |
51975db0 | 28 | |
c89810ac | 29 | #include <asm/setup.h> /* for COMMAND_LINE_SIZE */ |
4ef7b373 JK |
30 | #include <asm/page.h> |
31 | ||
704033ce LA |
32 | /* |
33 | * of_fdt_limit_memory - limit the number of regions in the /memory node | |
34 | * @limit: maximum entries | |
35 | * | |
36 | * Adjust the flattened device tree to have at most 'limit' number of | |
37 | * memory entries in the /memory node. This function may be called | |
38 | * any time after initial_boot_param is set. | |
39 | */ | |
40 | void of_fdt_limit_memory(int limit) | |
41 | { | |
42 | int memory; | |
43 | int len; | |
44 | const void *val; | |
45 | int nr_address_cells = OF_ROOT_NODE_ADDR_CELLS_DEFAULT; | |
46 | int nr_size_cells = OF_ROOT_NODE_SIZE_CELLS_DEFAULT; | |
47 | const uint32_t *addr_prop; | |
48 | const uint32_t *size_prop; | |
49 | int root_offset; | |
50 | int cell_size; | |
51 | ||
52 | root_offset = fdt_path_offset(initial_boot_params, "/"); | |
53 | if (root_offset < 0) | |
54 | return; | |
55 | ||
56 | addr_prop = fdt_getprop(initial_boot_params, root_offset, | |
57 | "#address-cells", NULL); | |
58 | if (addr_prop) | |
59 | nr_address_cells = fdt32_to_cpu(*addr_prop); | |
60 | ||
61 | size_prop = fdt_getprop(initial_boot_params, root_offset, | |
62 | "#size-cells", NULL); | |
63 | if (size_prop) | |
64 | nr_size_cells = fdt32_to_cpu(*size_prop); | |
65 | ||
66 | cell_size = sizeof(uint32_t)*(nr_address_cells + nr_size_cells); | |
67 | ||
68 | memory = fdt_path_offset(initial_boot_params, "/memory"); | |
69 | if (memory > 0) { | |
70 | val = fdt_getprop(initial_boot_params, memory, "reg", &len); | |
71 | if (len > limit*cell_size) { | |
72 | len = limit*cell_size; | |
73 | pr_debug("Limiting number of entries to %d\n", limit); | |
74 | fdt_setprop(initial_boot_params, memory, "reg", val, | |
75 | len); | |
76 | } | |
77 | } | |
78 | } | |
79 | ||
9706a36e SN |
80 | /** |
81 | * of_fdt_is_compatible - Return true if given node from the given blob has | |
82 | * compat in its compatible list | |
83 | * @blob: A device tree blob | |
84 | * @node: node to test | |
85 | * @compat: compatible string to compare with compatible list. | |
a4f740cf GL |
86 | * |
87 | * On match, returns a non-zero value with smaller values returned for more | |
88 | * specific compatible values. | |
9706a36e | 89 | */ |
c972de14 | 90 | int of_fdt_is_compatible(const void *blob, |
9706a36e SN |
91 | unsigned long node, const char *compat) |
92 | { | |
93 | const char *cp; | |
9d0c4dfe RH |
94 | int cplen; |
95 | unsigned long l, score = 0; | |
9706a36e | 96 | |
e6a6928c | 97 | cp = fdt_getprop(blob, node, "compatible", &cplen); |
9706a36e SN |
98 | if (cp == NULL) |
99 | return 0; | |
100 | while (cplen > 0) { | |
a4f740cf | 101 | score++; |
9706a36e | 102 | if (of_compat_cmp(cp, compat, strlen(compat)) == 0) |
a4f740cf | 103 | return score; |
9706a36e SN |
104 | l = strlen(cp) + 1; |
105 | cp += l; | |
106 | cplen -= l; | |
107 | } | |
108 | ||
109 | return 0; | |
110 | } | |
111 | ||
cc783786 KC |
112 | /** |
113 | * of_fdt_is_big_endian - Return true if given node needs BE MMIO accesses | |
114 | * @blob: A device tree blob | |
115 | * @node: node to test | |
116 | * | |
117 | * Returns true if the node has a "big-endian" property, or if the kernel | |
118 | * was compiled for BE *and* the node has a "native-endian" property. | |
119 | * Returns false otherwise. | |
120 | */ | |
121 | bool of_fdt_is_big_endian(const void *blob, unsigned long node) | |
122 | { | |
123 | if (fdt_getprop(blob, node, "big-endian", NULL)) | |
124 | return true; | |
125 | if (IS_ENABLED(CONFIG_CPU_BIG_ENDIAN) && | |
126 | fdt_getprop(blob, node, "native-endian", NULL)) | |
127 | return true; | |
128 | return false; | |
129 | } | |
130 | ||
a4f740cf GL |
131 | /** |
132 | * of_fdt_match - Return true if node matches a list of compatible values | |
133 | */ | |
c972de14 | 134 | int of_fdt_match(const void *blob, unsigned long node, |
7b482c83 | 135 | const char *const *compat) |
a4f740cf GL |
136 | { |
137 | unsigned int tmp, score = 0; | |
138 | ||
139 | if (!compat) | |
140 | return 0; | |
141 | ||
142 | while (*compat) { | |
143 | tmp = of_fdt_is_compatible(blob, node, *compat); | |
144 | if (tmp && (score == 0 || (tmp < score))) | |
145 | score = tmp; | |
146 | compat++; | |
147 | } | |
148 | ||
149 | return score; | |
150 | } | |
151 | ||
44856819 | 152 | static void *unflatten_dt_alloc(void **mem, unsigned long size, |
bbd33931 GL |
153 | unsigned long align) |
154 | { | |
155 | void *res; | |
156 | ||
44856819 GL |
157 | *mem = PTR_ALIGN(*mem, align); |
158 | res = *mem; | |
bbd33931 GL |
159 | *mem += size; |
160 | ||
161 | return res; | |
162 | } | |
163 | ||
dfbd4c6e GS |
164 | static void populate_properties(const void *blob, |
165 | int offset, | |
166 | void **mem, | |
167 | struct device_node *np, | |
168 | const char *nodename, | |
5063e25a | 169 | bool dryrun) |
bbd33931 | 170 | { |
dfbd4c6e GS |
171 | struct property *pp, **pprev = NULL; |
172 | int cur; | |
173 | bool has_name = false; | |
174 | ||
175 | pprev = &np->properties; | |
176 | for (cur = fdt_first_property_offset(blob, offset); | |
177 | cur >= 0; | |
178 | cur = fdt_next_property_offset(blob, cur)) { | |
179 | const __be32 *val; | |
180 | const char *pname; | |
181 | u32 sz; | |
182 | ||
183 | val = fdt_getprop_by_offset(blob, cur, &pname, &sz); | |
184 | if (!val) { | |
185 | pr_warn("%s: Cannot locate property at 0x%x\n", | |
186 | __func__, cur); | |
187 | continue; | |
188 | } | |
189 | ||
190 | if (!pname) { | |
191 | pr_warn("%s: Cannot find property name at 0x%x\n", | |
192 | __func__, cur); | |
193 | continue; | |
194 | } | |
195 | ||
196 | if (!strcmp(pname, "name")) | |
197 | has_name = true; | |
198 | ||
199 | pp = unflatten_dt_alloc(mem, sizeof(struct property), | |
200 | __alignof__(struct property)); | |
201 | if (dryrun) | |
202 | continue; | |
203 | ||
204 | /* We accept flattened tree phandles either in | |
205 | * ePAPR-style "phandle" properties, or the | |
206 | * legacy "linux,phandle" properties. If both | |
207 | * appear and have different values, things | |
208 | * will get weird. Don't do that. | |
209 | */ | |
210 | if (!strcmp(pname, "phandle") || | |
211 | !strcmp(pname, "linux,phandle")) { | |
212 | if (!np->phandle) | |
213 | np->phandle = be32_to_cpup(val); | |
214 | } | |
215 | ||
216 | /* And we process the "ibm,phandle" property | |
217 | * used in pSeries dynamic device tree | |
218 | * stuff | |
219 | */ | |
220 | if (!strcmp(pname, "ibm,phandle")) | |
221 | np->phandle = be32_to_cpup(val); | |
222 | ||
223 | pp->name = (char *)pname; | |
224 | pp->length = sz; | |
225 | pp->value = (__be32 *)val; | |
226 | *pprev = pp; | |
227 | pprev = &pp->next; | |
228 | } | |
229 | ||
230 | /* With version 0x10 we may not have the name property, | |
231 | * recreate it here from the unit name if absent | |
232 | */ | |
233 | if (!has_name) { | |
234 | const char *p = nodename, *ps = p, *pa = NULL; | |
235 | int len; | |
236 | ||
237 | while (*p) { | |
238 | if ((*p) == '@') | |
239 | pa = p; | |
240 | else if ((*p) == '/') | |
241 | ps = p + 1; | |
242 | p++; | |
243 | } | |
244 | ||
245 | if (pa < ps) | |
246 | pa = p; | |
247 | len = (pa - ps) + 1; | |
248 | pp = unflatten_dt_alloc(mem, sizeof(struct property) + len, | |
249 | __alignof__(struct property)); | |
250 | if (!dryrun) { | |
251 | pp->name = "name"; | |
252 | pp->length = len; | |
253 | pp->value = pp + 1; | |
254 | *pprev = pp; | |
255 | pprev = &pp->next; | |
256 | memcpy(pp->value, ps, len - 1); | |
257 | ((char *)pp->value)[len - 1] = 0; | |
258 | pr_debug("fixed up name for %s -> %s\n", | |
259 | nodename, (char *)pp->value); | |
260 | } | |
261 | } | |
262 | ||
263 | if (!dryrun) | |
264 | *pprev = NULL; | |
265 | } | |
266 | ||
dddc33e5 GS |
267 | static unsigned int populate_node(const void *blob, |
268 | int offset, | |
269 | void **mem, | |
270 | struct device_node *dad, | |
271 | unsigned int fpsize, | |
272 | struct device_node **pnp, | |
273 | bool dryrun) | |
dfbd4c6e | 274 | { |
bbd33931 | 275 | struct device_node *np; |
e6a6928c | 276 | const char *pathp; |
bbd33931 | 277 | unsigned int l, allocl; |
bbd33931 GL |
278 | int new_format = 0; |
279 | ||
dfbd4c6e GS |
280 | pathp = fdt_get_name(blob, offset, &l); |
281 | if (!pathp) { | |
282 | *pnp = NULL; | |
283 | return 0; | |
284 | } | |
e6a6928c | 285 | |
05f4647b | 286 | allocl = ++l; |
bbd33931 GL |
287 | |
288 | /* version 0x10 has a more compact unit name here instead of the full | |
289 | * path. we accumulate the full path size using "fpsize", we'll rebuild | |
290 | * it later. We detect this because the first character of the name is | |
291 | * not '/'. | |
292 | */ | |
293 | if ((*pathp) != '/') { | |
294 | new_format = 1; | |
295 | if (fpsize == 0) { | |
296 | /* root node: special case. fpsize accounts for path | |
297 | * plus terminating zero. root node only has '/', so | |
298 | * fpsize should be 2, but we want to avoid the first | |
299 | * level nodes to have two '/' so we use fpsize 1 here | |
300 | */ | |
301 | fpsize = 1; | |
302 | allocl = 2; | |
0fca5dea | 303 | l = 1; |
e6a6928c | 304 | pathp = ""; |
bbd33931 GL |
305 | } else { |
306 | /* account for '/' and path size minus terminal 0 | |
307 | * already in 'l' | |
308 | */ | |
309 | fpsize += l; | |
310 | allocl = fpsize; | |
311 | } | |
312 | } | |
313 | ||
dfbd4c6e | 314 | np = unflatten_dt_alloc(mem, sizeof(struct device_node) + allocl, |
bbd33931 | 315 | __alignof__(struct device_node)); |
5063e25a | 316 | if (!dryrun) { |
c22618a1 | 317 | char *fn; |
0829f6d1 | 318 | of_node_init(np); |
c22618a1 | 319 | np->full_name = fn = ((char *)np) + sizeof(*np); |
bbd33931 | 320 | if (new_format) { |
bbd33931 GL |
321 | /* rebuild full path for new format */ |
322 | if (dad && dad->parent) { | |
323 | strcpy(fn, dad->full_name); | |
324 | #ifdef DEBUG | |
325 | if ((strlen(fn) + l + 1) != allocl) { | |
326 | pr_debug("%s: p: %d, l: %d, a: %d\n", | |
327 | pathp, (int)strlen(fn), | |
328 | l, allocl); | |
329 | } | |
330 | #endif | |
331 | fn += strlen(fn); | |
332 | } | |
333 | *(fn++) = '/'; | |
c22618a1 GL |
334 | } |
335 | memcpy(fn, pathp, l); | |
336 | ||
bbd33931 GL |
337 | if (dad != NULL) { |
338 | np->parent = dad; | |
70161ff3 GL |
339 | np->sibling = dad->child; |
340 | dad->child = np; | |
bbd33931 | 341 | } |
bbd33931 | 342 | } |
e6a6928c | 343 | |
dfbd4c6e | 344 | populate_properties(blob, offset, mem, np, pathp, dryrun); |
5063e25a | 345 | if (!dryrun) { |
bbd33931 GL |
346 | np->name = of_get_property(np, "name", NULL); |
347 | np->type = of_get_property(np, "device_type", NULL); | |
348 | ||
349 | if (!np->name) | |
350 | np->name = "<NULL>"; | |
351 | if (!np->type) | |
352 | np->type = "<NULL>"; | |
353 | } | |
e6a6928c | 354 | |
dfbd4c6e GS |
355 | *pnp = np; |
356 | return fpsize; | |
357 | } | |
358 | ||
50800082 GS |
359 | static void reverse_nodes(struct device_node *parent) |
360 | { | |
361 | struct device_node *child, *next; | |
362 | ||
363 | /* In-depth first */ | |
364 | child = parent->child; | |
365 | while (child) { | |
366 | reverse_nodes(child); | |
367 | ||
368 | child = child->sibling; | |
369 | } | |
370 | ||
371 | /* Reverse the nodes in the child list */ | |
372 | child = parent->child; | |
373 | parent->child = NULL; | |
374 | while (child) { | |
375 | next = child->sibling; | |
376 | ||
377 | child->sibling = parent->child; | |
378 | parent->child = child; | |
379 | child = next; | |
380 | } | |
381 | } | |
382 | ||
dfbd4c6e | 383 | /** |
947c82cb | 384 | * unflatten_dt_nodes - Alloc and populate a device_node from the flat tree |
dfbd4c6e GS |
385 | * @blob: The parent device tree blob |
386 | * @mem: Memory chunk to use for allocating device nodes and properties | |
dfbd4c6e GS |
387 | * @dad: Parent struct device_node |
388 | * @nodepp: The device_node tree created by the call | |
50800082 GS |
389 | * |
390 | * It returns the size of unflattened device tree or error code | |
dfbd4c6e | 391 | */ |
947c82cb GS |
392 | static int unflatten_dt_nodes(const void *blob, |
393 | void *mem, | |
394 | struct device_node *dad, | |
395 | struct device_node **nodepp) | |
dfbd4c6e | 396 | { |
50800082 | 397 | struct device_node *root; |
8c237cd0 | 398 | int offset = 0, depth = 0, initial_depth = 0; |
50800082 | 399 | #define FDT_MAX_DEPTH 64 |
dddc33e5 | 400 | unsigned int fpsizes[FDT_MAX_DEPTH]; |
50800082 GS |
401 | struct device_node *nps[FDT_MAX_DEPTH]; |
402 | void *base = mem; | |
403 | bool dryrun = !base; | |
dfbd4c6e | 404 | |
50800082 GS |
405 | if (nodepp) |
406 | *nodepp = NULL; | |
407 | ||
8c237cd0 GS |
408 | /* |
409 | * We're unflattening device sub-tree if @dad is valid. There are | |
410 | * possibly multiple nodes in the first level of depth. We need | |
411 | * set @depth to 1 to make fdt_next_node() happy as it bails | |
412 | * immediately when negative @depth is found. Otherwise, the device | |
413 | * nodes except the first one won't be unflattened successfully. | |
414 | */ | |
415 | if (dad) | |
416 | depth = initial_depth = 1; | |
417 | ||
50800082 GS |
418 | root = dad; |
419 | fpsizes[depth] = dad ? strlen(of_node_full_name(dad)) : 0; | |
78c44d91 | 420 | nps[depth] = dad; |
8c237cd0 | 421 | |
50800082 | 422 | for (offset = 0; |
8c237cd0 | 423 | offset >= 0 && depth >= initial_depth; |
50800082 GS |
424 | offset = fdt_next_node(blob, offset, &depth)) { |
425 | if (WARN_ON_ONCE(depth >= FDT_MAX_DEPTH)) | |
426 | continue; | |
dfbd4c6e | 427 | |
78c44d91 RK |
428 | fpsizes[depth+1] = populate_node(blob, offset, &mem, |
429 | nps[depth], | |
430 | fpsizes[depth], | |
431 | &nps[depth+1], dryrun); | |
432 | if (!fpsizes[depth+1]) | |
50800082 GS |
433 | return mem - base; |
434 | ||
435 | if (!dryrun && nodepp && !*nodepp) | |
78c44d91 | 436 | *nodepp = nps[depth+1]; |
50800082 | 437 | if (!dryrun && !root) |
78c44d91 | 438 | root = nps[depth+1]; |
50800082 | 439 | } |
e6a6928c | 440 | |
50800082 GS |
441 | if (offset < 0 && offset != -FDT_ERR_NOTFOUND) { |
442 | pr_err("%s: Error %d processing FDT\n", __func__, offset); | |
443 | return -EINVAL; | |
444 | } | |
e6a6928c | 445 | |
70161ff3 GL |
446 | /* |
447 | * Reverse the child list. Some drivers assumes node order matches .dts | |
448 | * node order | |
449 | */ | |
50800082 GS |
450 | if (!dryrun) |
451 | reverse_nodes(root); | |
e6a6928c | 452 | |
50800082 | 453 | return mem - base; |
bbd33931 | 454 | } |
41f88009 | 455 | |
fe140423 SN |
456 | /** |
457 | * __unflatten_device_tree - create tree of device_nodes from flat blob | |
458 | * | |
459 | * unflattens a device-tree, creating the | |
460 | * tree of struct device_node. It also fills the "name" and "type" | |
461 | * pointers of the nodes so the normal device-tree walking functions | |
462 | * can be used. | |
463 | * @blob: The blob to expand | |
c4263233 | 464 | * @dad: Parent device node |
fe140423 SN |
465 | * @mynodes: The device_node tree created by the call |
466 | * @dt_alloc: An allocator that provides a virtual address to memory | |
467 | * for the resulting tree | |
83262418 GS |
468 | * |
469 | * Returns NULL on failure or the memory chunk containing the unflattened | |
470 | * device tree on success. | |
fe140423 | 471 | */ |
83262418 GS |
472 | static void *__unflatten_device_tree(const void *blob, |
473 | struct device_node *dad, | |
474 | struct device_node **mynodes, | |
475 | void *(*dt_alloc)(u64 size, u64 align)) | |
fe140423 | 476 | { |
50800082 | 477 | int size; |
e6a6928c | 478 | void *mem; |
fe140423 SN |
479 | |
480 | pr_debug(" -> unflatten_device_tree()\n"); | |
481 | ||
482 | if (!blob) { | |
483 | pr_debug("No device tree pointer\n"); | |
83262418 | 484 | return NULL; |
fe140423 SN |
485 | } |
486 | ||
487 | pr_debug("Unflattening device tree:\n"); | |
c972de14 RH |
488 | pr_debug("magic: %08x\n", fdt_magic(blob)); |
489 | pr_debug("size: %08x\n", fdt_totalsize(blob)); | |
490 | pr_debug("version: %08x\n", fdt_version(blob)); | |
fe140423 | 491 | |
c972de14 | 492 | if (fdt_check_header(blob)) { |
fe140423 | 493 | pr_err("Invalid device tree blob header\n"); |
83262418 | 494 | return NULL; |
fe140423 SN |
495 | } |
496 | ||
497 | /* First pass, scan for size */ | |
c4263233 | 498 | size = unflatten_dt_nodes(blob, NULL, dad, NULL); |
50800082 | 499 | if (size < 0) |
83262418 | 500 | return NULL; |
fe140423 | 501 | |
50800082 GS |
502 | size = ALIGN(size, 4); |
503 | pr_debug(" size is %d, allocating...\n", size); | |
fe140423 SN |
504 | |
505 | /* Allocate memory for the expanded device tree */ | |
44856819 GL |
506 | mem = dt_alloc(size + 4, __alignof__(struct device_node)); |
507 | memset(mem, 0, size); | |
fe140423 | 508 | |
44856819 | 509 | *(__be32 *)(mem + size) = cpu_to_be32(0xdeadbeef); |
9e401275 | 510 | |
44856819 | 511 | pr_debug(" unflattening %p...\n", mem); |
fe140423 SN |
512 | |
513 | /* Second pass, do actual unflattening */ | |
c4263233 | 514 | unflatten_dt_nodes(blob, mem, dad, mynodes); |
44856819 | 515 | if (be32_to_cpup(mem + size) != 0xdeadbeef) |
fe140423 | 516 | pr_warning("End of tree marker overwritten: %08x\n", |
44856819 | 517 | be32_to_cpup(mem + size)); |
fe140423 SN |
518 | |
519 | pr_debug(" <- unflatten_device_tree()\n"); | |
83262418 | 520 | return mem; |
fe140423 SN |
521 | } |
522 | ||
523 | static void *kernel_tree_alloc(u64 size, u64 align) | |
524 | { | |
525 | return kzalloc(size, GFP_KERNEL); | |
526 | } | |
527 | ||
f8062386 GR |
528 | static DEFINE_MUTEX(of_fdt_unflatten_mutex); |
529 | ||
fe140423 SN |
530 | /** |
531 | * of_fdt_unflatten_tree - create tree of device_nodes from flat blob | |
c4263233 GS |
532 | * @blob: Flat device tree blob |
533 | * @dad: Parent device node | |
534 | * @mynodes: The device tree created by the call | |
fe140423 SN |
535 | * |
536 | * unflattens the device-tree passed by the firmware, creating the | |
537 | * tree of struct device_node. It also fills the "name" and "type" | |
538 | * pointers of the nodes so the normal device-tree walking functions | |
539 | * can be used. | |
83262418 GS |
540 | * |
541 | * Returns NULL on failure or the memory chunk containing the unflattened | |
542 | * device tree on success. | |
fe140423 | 543 | */ |
83262418 GS |
544 | void *of_fdt_unflatten_tree(const unsigned long *blob, |
545 | struct device_node *dad, | |
546 | struct device_node **mynodes) | |
fe140423 | 547 | { |
83262418 GS |
548 | void *mem; |
549 | ||
f8062386 | 550 | mutex_lock(&of_fdt_unflatten_mutex); |
83262418 | 551 | mem = __unflatten_device_tree(blob, dad, mynodes, &kernel_tree_alloc); |
f8062386 | 552 | mutex_unlock(&of_fdt_unflatten_mutex); |
83262418 GS |
553 | |
554 | return mem; | |
fe140423 SN |
555 | } |
556 | EXPORT_SYMBOL_GPL(of_fdt_unflatten_tree); | |
557 | ||
57d00ecf SN |
558 | /* Everything below here references initial_boot_params directly. */ |
559 | int __initdata dt_root_addr_cells; | |
560 | int __initdata dt_root_size_cells; | |
561 | ||
1daa0c4c | 562 | void *initial_boot_params; |
57d00ecf SN |
563 | |
564 | #ifdef CONFIG_OF_EARLY_FLATTREE | |
565 | ||
08d53aa5 AB |
566 | static u32 of_fdt_crc32; |
567 | ||
e8d9d1f5 MS |
568 | /** |
569 | * res_mem_reserve_reg() - reserve all memory described in 'reg' property | |
570 | */ | |
571 | static int __init __reserved_mem_reserve_reg(unsigned long node, | |
572 | const char *uname) | |
573 | { | |
574 | int t_len = (dt_root_addr_cells + dt_root_size_cells) * sizeof(__be32); | |
575 | phys_addr_t base, size; | |
9d0c4dfe RH |
576 | int len; |
577 | const __be32 *prop; | |
3f0c8206 | 578 | int nomap, first = 1; |
e8d9d1f5 MS |
579 | |
580 | prop = of_get_flat_dt_prop(node, "reg", &len); | |
581 | if (!prop) | |
582 | return -ENOENT; | |
583 | ||
584 | if (len && len % t_len != 0) { | |
585 | pr_err("Reserved memory: invalid reg property in '%s', skipping node.\n", | |
586 | uname); | |
587 | return -EINVAL; | |
588 | } | |
589 | ||
590 | nomap = of_get_flat_dt_prop(node, "no-map", NULL) != NULL; | |
591 | ||
592 | while (len >= t_len) { | |
593 | base = dt_mem_next_cell(dt_root_addr_cells, &prop); | |
594 | size = dt_mem_next_cell(dt_root_size_cells, &prop); | |
595 | ||
b5f2a8c0 | 596 | if (size && |
e8d9d1f5 MS |
597 | early_init_dt_reserve_memory_arch(base, size, nomap) == 0) |
598 | pr_debug("Reserved memory: reserved region for node '%s': base %pa, size %ld MiB\n", | |
599 | uname, &base, (unsigned long)size / SZ_1M); | |
600 | else | |
601 | pr_info("Reserved memory: failed to reserve memory for node '%s': base %pa, size %ld MiB\n", | |
602 | uname, &base, (unsigned long)size / SZ_1M); | |
603 | ||
604 | len -= t_len; | |
3f0c8206 MS |
605 | if (first) { |
606 | fdt_reserved_mem_save_node(node, uname, base, size); | |
607 | first = 0; | |
608 | } | |
e8d9d1f5 MS |
609 | } |
610 | return 0; | |
611 | } | |
612 | ||
613 | /** | |
614 | * __reserved_mem_check_root() - check if #size-cells, #address-cells provided | |
615 | * in /reserved-memory matches the values supported by the current implementation, | |
616 | * also check if ranges property has been provided | |
617 | */ | |
5b624118 | 618 | static int __init __reserved_mem_check_root(unsigned long node) |
e8d9d1f5 | 619 | { |
9d0c4dfe | 620 | const __be32 *prop; |
e8d9d1f5 MS |
621 | |
622 | prop = of_get_flat_dt_prop(node, "#size-cells", NULL); | |
623 | if (!prop || be32_to_cpup(prop) != dt_root_size_cells) | |
624 | return -EINVAL; | |
625 | ||
626 | prop = of_get_flat_dt_prop(node, "#address-cells", NULL); | |
627 | if (!prop || be32_to_cpup(prop) != dt_root_addr_cells) | |
628 | return -EINVAL; | |
629 | ||
630 | prop = of_get_flat_dt_prop(node, "ranges", NULL); | |
631 | if (!prop) | |
632 | return -EINVAL; | |
633 | return 0; | |
634 | } | |
635 | ||
636 | /** | |
637 | * fdt_scan_reserved_mem() - scan a single FDT node for reserved memory | |
638 | */ | |
639 | static int __init __fdt_scan_reserved_mem(unsigned long node, const char *uname, | |
640 | int depth, void *data) | |
641 | { | |
642 | static int found; | |
643 | const char *status; | |
3f0c8206 | 644 | int err; |
e8d9d1f5 MS |
645 | |
646 | if (!found && depth == 1 && strcmp(uname, "reserved-memory") == 0) { | |
647 | if (__reserved_mem_check_root(node) != 0) { | |
648 | pr_err("Reserved memory: unsupported node format, ignoring\n"); | |
649 | /* break scan */ | |
650 | return 1; | |
651 | } | |
652 | found = 1; | |
653 | /* scan next node */ | |
654 | return 0; | |
655 | } else if (!found) { | |
656 | /* scan next node */ | |
657 | return 0; | |
658 | } else if (found && depth < 2) { | |
659 | /* scanning of /reserved-memory has been finished */ | |
660 | return 1; | |
661 | } | |
662 | ||
663 | status = of_get_flat_dt_prop(node, "status", NULL); | |
664 | if (status && strcmp(status, "okay") != 0 && strcmp(status, "ok") != 0) | |
665 | return 0; | |
666 | ||
3f0c8206 MS |
667 | err = __reserved_mem_reserve_reg(node, uname); |
668 | if (err == -ENOENT && of_get_flat_dt_prop(node, "size", NULL)) | |
669 | fdt_reserved_mem_save_node(node, uname, 0, 0); | |
e8d9d1f5 MS |
670 | |
671 | /* scan next node */ | |
672 | return 0; | |
673 | } | |
674 | ||
675 | /** | |
676 | * early_init_fdt_scan_reserved_mem() - create reserved memory regions | |
677 | * | |
678 | * This function grabs memory from early allocator for device exclusive use | |
679 | * defined in device tree structures. It should be called by arch specific code | |
680 | * once the early allocator (i.e. memblock) has been fully activated. | |
681 | */ | |
682 | void __init early_init_fdt_scan_reserved_mem(void) | |
683 | { | |
d1552ce4 RH |
684 | int n; |
685 | u64 base, size; | |
686 | ||
2040b527 JC |
687 | if (!initial_boot_params) |
688 | return; | |
689 | ||
d1552ce4 RH |
690 | /* Process header /memreserve/ fields */ |
691 | for (n = 0; ; n++) { | |
692 | fdt_get_mem_rsv(initial_boot_params, n, &base, &size); | |
693 | if (!size) | |
694 | break; | |
695 | early_init_dt_reserve_memory_arch(base, size, 0); | |
696 | } | |
697 | ||
e8d9d1f5 | 698 | of_scan_flat_dt(__fdt_scan_reserved_mem, NULL); |
3f0c8206 | 699 | fdt_init_reserved_mem(); |
e8d9d1f5 MS |
700 | } |
701 | ||
24bbd929 AB |
702 | /** |
703 | * early_init_fdt_reserve_self() - reserve the memory used by the FDT blob | |
704 | */ | |
705 | void __init early_init_fdt_reserve_self(void) | |
706 | { | |
707 | if (!initial_boot_params) | |
708 | return; | |
709 | ||
710 | /* Reserve the dtb region */ | |
711 | early_init_dt_reserve_memory_arch(__pa(initial_boot_params), | |
712 | fdt_totalsize(initial_boot_params), | |
713 | 0); | |
714 | } | |
715 | ||
57d00ecf SN |
716 | /** |
717 | * of_scan_flat_dt - scan flattened tree blob and call callback on each. | |
718 | * @it: callback function | |
719 | * @data: context data pointer | |
720 | * | |
721 | * This function is used to scan the flattened device-tree, it is | |
722 | * used to extract the memory information at boot before we can | |
723 | * unflatten the tree | |
724 | */ | |
725 | int __init of_scan_flat_dt(int (*it)(unsigned long node, | |
726 | const char *uname, int depth, | |
727 | void *data), | |
728 | void *data) | |
729 | { | |
e6a6928c RH |
730 | const void *blob = initial_boot_params; |
731 | const char *pathp; | |
732 | int offset, rc = 0, depth = -1; | |
733 | ||
734 | for (offset = fdt_next_node(blob, -1, &depth); | |
735 | offset >= 0 && depth >= 0 && !rc; | |
736 | offset = fdt_next_node(blob, offset, &depth)) { | |
737 | ||
738 | pathp = fdt_get_name(blob, offset, NULL); | |
375da3a7 AS |
739 | if (*pathp == '/') |
740 | pathp = kbasename(pathp); | |
e6a6928c RH |
741 | rc = it(offset, pathp, depth, data); |
742 | } | |
57d00ecf SN |
743 | return rc; |
744 | } | |
745 | ||
9c609868 SZ |
746 | /** |
747 | * of_get_flat_dt_subnode_by_name - get the subnode by given name | |
748 | * | |
749 | * @node: the parent node | |
750 | * @uname: the name of subnode | |
751 | * @return offset of the subnode, or -FDT_ERR_NOTFOUND if there is none | |
752 | */ | |
753 | ||
754 | int of_get_flat_dt_subnode_by_name(unsigned long node, const char *uname) | |
755 | { | |
756 | return fdt_subnode_offset(initial_boot_params, node, uname); | |
757 | } | |
758 | ||
57d00ecf SN |
759 | /** |
760 | * of_get_flat_dt_root - find the root node in the flat blob | |
761 | */ | |
762 | unsigned long __init of_get_flat_dt_root(void) | |
763 | { | |
e6a6928c | 764 | return 0; |
57d00ecf SN |
765 | } |
766 | ||
c0556d3f RH |
767 | /** |
768 | * of_get_flat_dt_size - Return the total size of the FDT | |
769 | */ | |
770 | int __init of_get_flat_dt_size(void) | |
771 | { | |
772 | return fdt_totalsize(initial_boot_params); | |
773 | } | |
774 | ||
57d00ecf SN |
775 | /** |
776 | * of_get_flat_dt_prop - Given a node in the flat blob, return the property ptr | |
777 | * | |
778 | * This function can be used within scan_flattened_dt callback to get | |
779 | * access to properties | |
780 | */ | |
9d0c4dfe RH |
781 | const void *__init of_get_flat_dt_prop(unsigned long node, const char *name, |
782 | int *size) | |
57d00ecf | 783 | { |
e6a6928c | 784 | return fdt_getprop(initial_boot_params, node, name, size); |
57d00ecf SN |
785 | } |
786 | ||
787 | /** | |
788 | * of_flat_dt_is_compatible - Return true if given node has compat in compatible list | |
789 | * @node: node to test | |
790 | * @compat: compatible string to compare with compatible list. | |
791 | */ | |
792 | int __init of_flat_dt_is_compatible(unsigned long node, const char *compat) | |
793 | { | |
794 | return of_fdt_is_compatible(initial_boot_params, node, compat); | |
795 | } | |
796 | ||
a4f740cf GL |
797 | /** |
798 | * of_flat_dt_match - Return true if node matches a list of compatible values | |
799 | */ | |
7b482c83 | 800 | int __init of_flat_dt_match(unsigned long node, const char *const *compat) |
a4f740cf GL |
801 | { |
802 | return of_fdt_match(initial_boot_params, node, compat); | |
803 | } | |
804 | ||
57d74bcf MS |
805 | struct fdt_scan_status { |
806 | const char *name; | |
807 | int namelen; | |
808 | int depth; | |
809 | int found; | |
810 | int (*iterator)(unsigned long node, const char *uname, int depth, void *data); | |
811 | void *data; | |
812 | }; | |
813 | ||
6a903a25 RH |
814 | const char * __init of_flat_dt_get_machine_name(void) |
815 | { | |
816 | const char *name; | |
817 | unsigned long dt_root = of_get_flat_dt_root(); | |
818 | ||
819 | name = of_get_flat_dt_prop(dt_root, "model", NULL); | |
820 | if (!name) | |
821 | name = of_get_flat_dt_prop(dt_root, "compatible", NULL); | |
822 | return name; | |
823 | } | |
824 | ||
825 | /** | |
826 | * of_flat_dt_match_machine - Iterate match tables to find matching machine. | |
827 | * | |
828 | * @default_match: A machine specific ptr to return in case of no match. | |
829 | * @get_next_compat: callback function to return next compatible match table. | |
830 | * | |
831 | * Iterate through machine match tables to find the best match for the machine | |
832 | * compatible string in the FDT. | |
833 | */ | |
834 | const void * __init of_flat_dt_match_machine(const void *default_match, | |
835 | const void * (*get_next_compat)(const char * const**)) | |
836 | { | |
837 | const void *data = NULL; | |
838 | const void *best_data = default_match; | |
839 | const char *const *compat; | |
840 | unsigned long dt_root; | |
841 | unsigned int best_score = ~1, score = 0; | |
842 | ||
843 | dt_root = of_get_flat_dt_root(); | |
844 | while ((data = get_next_compat(&compat))) { | |
845 | score = of_flat_dt_match(dt_root, compat); | |
846 | if (score > 0 && score < best_score) { | |
847 | best_data = data; | |
848 | best_score = score; | |
849 | } | |
850 | } | |
851 | if (!best_data) { | |
852 | const char *prop; | |
9d0c4dfe | 853 | int size; |
6a903a25 RH |
854 | |
855 | pr_err("\n unrecognized device tree list:\n[ "); | |
856 | ||
857 | prop = of_get_flat_dt_prop(dt_root, "compatible", &size); | |
858 | if (prop) { | |
859 | while (size > 0) { | |
860 | printk("'%s' ", prop); | |
861 | size -= strlen(prop) + 1; | |
862 | prop += strlen(prop) + 1; | |
863 | } | |
864 | } | |
865 | printk("]\n\n"); | |
866 | return NULL; | |
867 | } | |
868 | ||
869 | pr_info("Machine model: %s\n", of_flat_dt_get_machine_name()); | |
870 | ||
871 | return best_data; | |
872 | } | |
873 | ||
f7b3a835 | 874 | #ifdef CONFIG_BLK_DEV_INITRD |
369bc9ab AB |
875 | #ifndef __early_init_dt_declare_initrd |
876 | static void __early_init_dt_declare_initrd(unsigned long start, | |
877 | unsigned long end) | |
878 | { | |
879 | initrd_start = (unsigned long)__va(start); | |
880 | initrd_end = (unsigned long)__va(end); | |
881 | initrd_below_start_ok = 1; | |
882 | } | |
883 | #endif | |
884 | ||
f7b3a835 GL |
885 | /** |
886 | * early_init_dt_check_for_initrd - Decode initrd location from flat tree | |
887 | * @node: reference to node containing initrd location ('chosen') | |
888 | */ | |
29eb45a9 | 889 | static void __init early_init_dt_check_for_initrd(unsigned long node) |
f7b3a835 | 890 | { |
374d5c99 | 891 | u64 start, end; |
9d0c4dfe RH |
892 | int len; |
893 | const __be32 *prop; | |
f7b3a835 GL |
894 | |
895 | pr_debug("Looking for initrd properties... "); | |
896 | ||
897 | prop = of_get_flat_dt_prop(node, "linux,initrd-start", &len); | |
1406bc2f JK |
898 | if (!prop) |
899 | return; | |
374d5c99 | 900 | start = of_read_number(prop, len/4); |
1406bc2f JK |
901 | |
902 | prop = of_get_flat_dt_prop(node, "linux,initrd-end", &len); | |
903 | if (!prop) | |
904 | return; | |
374d5c99 | 905 | end = of_read_number(prop, len/4); |
f7b3a835 | 906 | |
369bc9ab | 907 | __early_init_dt_declare_initrd(start, end); |
29eb45a9 | 908 | |
374d5c99 SS |
909 | pr_debug("initrd_start=0x%llx initrd_end=0x%llx\n", |
910 | (unsigned long long)start, (unsigned long long)end); | |
f7b3a835 GL |
911 | } |
912 | #else | |
29eb45a9 | 913 | static inline void early_init_dt_check_for_initrd(unsigned long node) |
f7b3a835 GL |
914 | { |
915 | } | |
916 | #endif /* CONFIG_BLK_DEV_INITRD */ | |
917 | ||
fb11ffe7 | 918 | #ifdef CONFIG_SERIAL_EARLYCON |
fb11ffe7 | 919 | |
523bf17f | 920 | static int __init early_init_dt_scan_chosen_serial(void) |
fb11ffe7 RH |
921 | { |
922 | int offset; | |
4d118c9a | 923 | const char *p, *q, *options = NULL; |
fb11ffe7 | 924 | int l; |
2eaa7909 | 925 | const struct earlycon_id *match; |
fb11ffe7 RH |
926 | const void *fdt = initial_boot_params; |
927 | ||
928 | offset = fdt_path_offset(fdt, "/chosen"); | |
929 | if (offset < 0) | |
930 | offset = fdt_path_offset(fdt, "/chosen@0"); | |
931 | if (offset < 0) | |
932 | return -ENOENT; | |
933 | ||
934 | p = fdt_getprop(fdt, offset, "stdout-path", &l); | |
935 | if (!p) | |
936 | p = fdt_getprop(fdt, offset, "linux,stdout-path", &l); | |
937 | if (!p || !l) | |
938 | return -ENOENT; | |
939 | ||
4d118c9a PH |
940 | q = strchrnul(p, ':'); |
941 | if (*q != '\0') | |
942 | options = q + 1; | |
0fcc286f | 943 | l = q - p; |
6296ad9e | 944 | |
fb11ffe7 | 945 | /* Get the node specified by stdout-path */ |
0fcc286f PH |
946 | offset = fdt_path_offset_namelen(fdt, p, l); |
947 | if (offset < 0) { | |
948 | pr_warn("earlycon: stdout-path %.*s not found\n", l, p); | |
949 | return 0; | |
950 | } | |
fb11ffe7 | 951 | |
2eaa7909 | 952 | for (match = __earlycon_table; match < __earlycon_table_end; match++) { |
2eaa7909 PH |
953 | if (!match->compatible[0]) |
954 | continue; | |
955 | ||
956 | if (fdt_node_check_compatible(fdt, offset, match->compatible)) | |
fb11ffe7 | 957 | continue; |
fb11ffe7 | 958 | |
c90fe9c0 | 959 | of_setup_earlycon(match, offset, options); |
fb11ffe7 RH |
960 | return 0; |
961 | } | |
962 | return -ENODEV; | |
963 | } | |
964 | ||
965 | static int __init setup_of_earlycon(char *buf) | |
966 | { | |
967 | if (buf) | |
968 | return 0; | |
969 | ||
970 | return early_init_dt_scan_chosen_serial(); | |
971 | } | |
972 | early_param("earlycon", setup_of_earlycon); | |
973 | #endif | |
974 | ||
f00abd94 GL |
975 | /** |
976 | * early_init_dt_scan_root - fetch the top level address and size cells | |
977 | */ | |
978 | int __init early_init_dt_scan_root(unsigned long node, const char *uname, | |
979 | int depth, void *data) | |
980 | { | |
9d0c4dfe | 981 | const __be32 *prop; |
f00abd94 GL |
982 | |
983 | if (depth != 0) | |
984 | return 0; | |
985 | ||
33714881 JK |
986 | dt_root_size_cells = OF_ROOT_NODE_SIZE_CELLS_DEFAULT; |
987 | dt_root_addr_cells = OF_ROOT_NODE_ADDR_CELLS_DEFAULT; | |
988 | ||
f00abd94 | 989 | prop = of_get_flat_dt_prop(node, "#size-cells", NULL); |
33714881 JK |
990 | if (prop) |
991 | dt_root_size_cells = be32_to_cpup(prop); | |
f00abd94 GL |
992 | pr_debug("dt_root_size_cells = %x\n", dt_root_size_cells); |
993 | ||
994 | prop = of_get_flat_dt_prop(node, "#address-cells", NULL); | |
33714881 JK |
995 | if (prop) |
996 | dt_root_addr_cells = be32_to_cpup(prop); | |
f00abd94 GL |
997 | pr_debug("dt_root_addr_cells = %x\n", dt_root_addr_cells); |
998 | ||
999 | /* break now */ | |
1000 | return 1; | |
1001 | } | |
1002 | ||
9d0c4dfe | 1003 | u64 __init dt_mem_next_cell(int s, const __be32 **cellp) |
83f7a06e | 1004 | { |
9d0c4dfe | 1005 | const __be32 *p = *cellp; |
83f7a06e GL |
1006 | |
1007 | *cellp = p + s; | |
1008 | return of_read_number(p, s); | |
1009 | } | |
1010 | ||
51975db0 GL |
1011 | /** |
1012 | * early_init_dt_scan_memory - Look for an parse memory nodes | |
1013 | */ | |
1014 | int __init early_init_dt_scan_memory(unsigned long node, const char *uname, | |
1015 | int depth, void *data) | |
1016 | { | |
9d0c4dfe RH |
1017 | const char *type = of_get_flat_dt_prop(node, "device_type", NULL); |
1018 | const __be32 *reg, *endp; | |
1019 | int l; | |
51975db0 GL |
1020 | |
1021 | /* We are scanning "memory" nodes only */ | |
1022 | if (type == NULL) { | |
1023 | /* | |
1024 | * The longtrail doesn't have a device_type on the | |
1025 | * /memory node, so look for the node called /memory@0. | |
1026 | */ | |
b44aa25d | 1027 | if (!IS_ENABLED(CONFIG_PPC32) || depth != 1 || strcmp(uname, "memory@0") != 0) |
51975db0 GL |
1028 | return 0; |
1029 | } else if (strcmp(type, "memory") != 0) | |
1030 | return 0; | |
1031 | ||
1032 | reg = of_get_flat_dt_prop(node, "linux,usable-memory", &l); | |
1033 | if (reg == NULL) | |
1034 | reg = of_get_flat_dt_prop(node, "reg", &l); | |
1035 | if (reg == NULL) | |
1036 | return 0; | |
1037 | ||
1038 | endp = reg + (l / sizeof(__be32)); | |
1039 | ||
c954b36e | 1040 | pr_debug("memory scan node %s, reg size %d,\n", uname, l); |
51975db0 GL |
1041 | |
1042 | while ((endp - reg) >= (dt_root_addr_cells + dt_root_size_cells)) { | |
1043 | u64 base, size; | |
1044 | ||
1045 | base = dt_mem_next_cell(dt_root_addr_cells, ®); | |
1046 | size = dt_mem_next_cell(dt_root_size_cells, ®); | |
1047 | ||
1048 | if (size == 0) | |
1049 | continue; | |
1050 | pr_debug(" - %llx , %llx\n", (unsigned long long)base, | |
1051 | (unsigned long long)size); | |
1052 | ||
1053 | early_init_dt_add_memory_arch(base, size); | |
1054 | } | |
1055 | ||
1056 | return 0; | |
1057 | } | |
1058 | ||
86e03221 GL |
1059 | int __init early_init_dt_scan_chosen(unsigned long node, const char *uname, |
1060 | int depth, void *data) | |
1061 | { | |
9d0c4dfe RH |
1062 | int l; |
1063 | const char *p; | |
86e03221 GL |
1064 | |
1065 | pr_debug("search \"chosen\", depth: %d, uname: %s\n", depth, uname); | |
1066 | ||
85f60ae4 | 1067 | if (depth != 1 || !data || |
86e03221 GL |
1068 | (strcmp(uname, "chosen") != 0 && strcmp(uname, "chosen@0") != 0)) |
1069 | return 0; | |
1070 | ||
1071 | early_init_dt_check_for_initrd(node); | |
1072 | ||
25985edc | 1073 | /* Retrieve command line */ |
86e03221 GL |
1074 | p = of_get_flat_dt_prop(node, "bootargs", &l); |
1075 | if (p != NULL && l > 0) | |
85f60ae4 | 1076 | strlcpy(data, p, min((int)l, COMMAND_LINE_SIZE)); |
86e03221 | 1077 | |
78b782cb BH |
1078 | /* |
1079 | * CONFIG_CMDLINE is meant to be a default in case nothing else | |
1080 | * managed to set the command line, unless CONFIG_CMDLINE_FORCE | |
1081 | * is set in which case we override whatever was found earlier. | |
1082 | */ | |
86e03221 | 1083 | #ifdef CONFIG_CMDLINE |
34b82026 MU |
1084 | #if defined(CONFIG_CMDLINE_EXTEND) |
1085 | strlcat(data, " ", COMMAND_LINE_SIZE); | |
1086 | strlcat(data, CONFIG_CMDLINE, COMMAND_LINE_SIZE); | |
1087 | #elif defined(CONFIG_CMDLINE_FORCE) | |
1088 | strlcpy(data, CONFIG_CMDLINE, COMMAND_LINE_SIZE); | |
1089 | #else | |
1090 | /* No arguments from boot loader, use kernel's cmdl*/ | |
78b782cb | 1091 | if (!((char *)data)[0]) |
85f60ae4 | 1092 | strlcpy(data, CONFIG_CMDLINE, COMMAND_LINE_SIZE); |
34b82026 | 1093 | #endif |
86e03221 GL |
1094 | #endif /* CONFIG_CMDLINE */ |
1095 | ||
85f60ae4 | 1096 | pr_debug("Command line is: %s\n", (char*)data); |
86e03221 GL |
1097 | |
1098 | /* break now */ | |
1099 | return 1; | |
1100 | } | |
1101 | ||
a1727da5 | 1102 | #ifdef CONFIG_HAVE_MEMBLOCK |
270522a0 AB |
1103 | #ifndef MIN_MEMBLOCK_ADDR |
1104 | #define MIN_MEMBLOCK_ADDR __pa(PAGE_OFFSET) | |
1105 | #endif | |
8eafeb48 AB |
1106 | #ifndef MAX_MEMBLOCK_ADDR |
1107 | #define MAX_MEMBLOCK_ADDR ((phys_addr_t)~0) | |
1108 | #endif | |
3069f0c0 | 1109 | |
068f6310 RH |
1110 | void __init __weak early_init_dt_add_memory_arch(u64 base, u64 size) |
1111 | { | |
270522a0 | 1112 | const u64 phys_offset = MIN_MEMBLOCK_ADDR; |
8f73d4b7 GU |
1113 | |
1114 | if (!PAGE_ALIGNED(base)) { | |
8cccffc5 AB |
1115 | if (size < PAGE_SIZE - (base & ~PAGE_MASK)) { |
1116 | pr_warn("Ignoring memory block 0x%llx - 0x%llx\n", | |
1117 | base, base + size); | |
1118 | return; | |
1119 | } | |
8f73d4b7 GU |
1120 | size -= PAGE_SIZE - (base & ~PAGE_MASK); |
1121 | base = PAGE_ALIGN(base); | |
1122 | } | |
068f6310 | 1123 | size &= PAGE_MASK; |
a67a6ed1 | 1124 | |
8eafeb48 | 1125 | if (base > MAX_MEMBLOCK_ADDR) { |
3069f0c0 LA |
1126 | pr_warning("Ignoring memory block 0x%llx - 0x%llx\n", |
1127 | base, base + size); | |
1128 | return; | |
1129 | } | |
a67a6ed1 | 1130 | |
8eafeb48 | 1131 | if (base + size - 1 > MAX_MEMBLOCK_ADDR) { |
9aacd602 | 1132 | pr_warning("Ignoring memory range 0x%llx - 0x%llx\n", |
8eafeb48 AB |
1133 | ((u64)MAX_MEMBLOCK_ADDR) + 1, base + size); |
1134 | size = MAX_MEMBLOCK_ADDR - base + 1; | |
a67a6ed1 LA |
1135 | } |
1136 | ||
068f6310 RH |
1137 | if (base + size < phys_offset) { |
1138 | pr_warning("Ignoring memory block 0x%llx - 0x%llx\n", | |
1139 | base, base + size); | |
1140 | return; | |
1141 | } | |
1142 | if (base < phys_offset) { | |
1143 | pr_warning("Ignoring memory range 0x%llx - 0x%llx\n", | |
1144 | base, phys_offset); | |
1145 | size -= phys_offset - base; | |
1146 | base = phys_offset; | |
1147 | } | |
1148 | memblock_add(base, size); | |
1149 | } | |
1150 | ||
e8d9d1f5 MS |
1151 | int __init __weak early_init_dt_reserve_memory_arch(phys_addr_t base, |
1152 | phys_addr_t size, bool nomap) | |
1153 | { | |
e8d9d1f5 MS |
1154 | if (nomap) |
1155 | return memblock_remove(base, size); | |
1156 | return memblock_reserve(base, size); | |
1157 | } | |
1158 | ||
a1727da5 GL |
1159 | /* |
1160 | * called from unflatten_device_tree() to bootstrap devicetree itself | |
1161 | * Architectures can override this definition if memblock isn't used | |
1162 | */ | |
1163 | void * __init __weak early_init_dt_alloc_memory_arch(u64 size, u64 align) | |
1164 | { | |
1165 | return __va(memblock_alloc(size, align)); | |
1166 | } | |
e8d9d1f5 | 1167 | #else |
aefc7ec2 RH |
1168 | void __init __weak early_init_dt_add_memory_arch(u64 base, u64 size) |
1169 | { | |
1170 | WARN_ON(1); | |
1171 | } | |
1172 | ||
e8d9d1f5 MS |
1173 | int __init __weak early_init_dt_reserve_memory_arch(phys_addr_t base, |
1174 | phys_addr_t size, bool nomap) | |
1175 | { | |
78bb2abe | 1176 | pr_err("Reserved memory not supported, ignoring range %pa - %pa%s\n", |
1d1a661d | 1177 | &base, &size, nomap ? " (nomap)" : ""); |
e8d9d1f5 MS |
1178 | return -ENOSYS; |
1179 | } | |
aefc7ec2 RH |
1180 | |
1181 | void * __init __weak early_init_dt_alloc_memory_arch(u64 size, u64 align) | |
1182 | { | |
1183 | WARN_ON(1); | |
1184 | return NULL; | |
1185 | } | |
a1727da5 GL |
1186 | #endif |
1187 | ||
4972a74b | 1188 | bool __init early_init_dt_verify(void *params) |
0288ffcb RH |
1189 | { |
1190 | if (!params) | |
1191 | return false; | |
1192 | ||
0288ffcb | 1193 | /* check device tree validity */ |
50ba08f3 | 1194 | if (fdt_check_header(params)) |
0288ffcb | 1195 | return false; |
0288ffcb | 1196 | |
50ba08f3 BH |
1197 | /* Setup flat device-tree pointer */ |
1198 | initial_boot_params = params; | |
08d53aa5 AB |
1199 | of_fdt_crc32 = crc32_be(~0, initial_boot_params, |
1200 | fdt_totalsize(initial_boot_params)); | |
4972a74b LA |
1201 | return true; |
1202 | } | |
1203 | ||
1204 | ||
1205 | void __init early_init_dt_scan_nodes(void) | |
1206 | { | |
0288ffcb RH |
1207 | /* Retrieve various information from the /chosen node */ |
1208 | of_scan_flat_dt(early_init_dt_scan_chosen, boot_command_line); | |
1209 | ||
1210 | /* Initialize {size,address}-cells info */ | |
1211 | of_scan_flat_dt(early_init_dt_scan_root, NULL); | |
1212 | ||
1213 | /* Setup memory, calling early_init_dt_add_memory_arch */ | |
1214 | of_scan_flat_dt(early_init_dt_scan_memory, NULL); | |
4972a74b LA |
1215 | } |
1216 | ||
1217 | bool __init early_init_dt_scan(void *params) | |
1218 | { | |
1219 | bool status; | |
1220 | ||
1221 | status = early_init_dt_verify(params); | |
1222 | if (!status) | |
1223 | return false; | |
0288ffcb | 1224 | |
4972a74b | 1225 | early_init_dt_scan_nodes(); |
0288ffcb RH |
1226 | return true; |
1227 | } | |
1228 | ||
41f88009 GL |
1229 | /** |
1230 | * unflatten_device_tree - create tree of device_nodes from flat blob | |
1231 | * | |
1232 | * unflattens the device-tree passed by the firmware, creating the | |
1233 | * tree of struct device_node. It also fills the "name" and "type" | |
1234 | * pointers of the nodes so the normal device-tree walking functions | |
1235 | * can be used. | |
1236 | */ | |
1237 | void __init unflatten_device_tree(void) | |
1238 | { | |
c4263233 | 1239 | __unflatten_device_tree(initial_boot_params, NULL, &of_root, |
672c5446 | 1240 | early_init_dt_alloc_memory_arch); |
41f88009 | 1241 | |
4c7d6361 | 1242 | /* Get pointer to "/chosen" and "/aliases" nodes for use everywhere */ |
611cad72 | 1243 | of_alias_scan(early_init_dt_alloc_memory_arch); |
41f88009 | 1244 | } |
e6ce1324 | 1245 | |
a8bf7527 RH |
1246 | /** |
1247 | * unflatten_and_copy_device_tree - copy and create tree of device_nodes from flat blob | |
1248 | * | |
1249 | * Copies and unflattens the device-tree passed by the firmware, creating the | |
1250 | * tree of struct device_node. It also fills the "name" and "type" | |
1251 | * pointers of the nodes so the normal device-tree walking functions | |
1252 | * can be used. This should only be used when the FDT memory has not been | |
1253 | * reserved such is the case when the FDT is built-in to the kernel init | |
1254 | * section. If the FDT memory is reserved already then unflatten_device_tree | |
1255 | * should be used instead. | |
1256 | */ | |
1257 | void __init unflatten_and_copy_device_tree(void) | |
1258 | { | |
6f041e99 JH |
1259 | int size; |
1260 | void *dt; | |
1261 | ||
1262 | if (!initial_boot_params) { | |
1263 | pr_warn("No valid device tree found, continuing without\n"); | |
1264 | return; | |
1265 | } | |
1266 | ||
c972de14 | 1267 | size = fdt_totalsize(initial_boot_params); |
6f041e99 | 1268 | dt = early_init_dt_alloc_memory_arch(size, |
c972de14 | 1269 | roundup_pow_of_two(FDT_V17_SIZE)); |
a8bf7527 RH |
1270 | |
1271 | if (dt) { | |
1272 | memcpy(dt, initial_boot_params, size); | |
1273 | initial_boot_params = dt; | |
1274 | } | |
1275 | unflatten_device_tree(); | |
1276 | } | |
1277 | ||
08d53aa5 AB |
1278 | #ifdef CONFIG_SYSFS |
1279 | static ssize_t of_fdt_raw_read(struct file *filp, struct kobject *kobj, | |
1280 | struct bin_attribute *bin_attr, | |
1281 | char *buf, loff_t off, size_t count) | |
b0a6fb36 | 1282 | { |
08d53aa5 AB |
1283 | memcpy(buf, initial_boot_params + off, count); |
1284 | return count; | |
1285 | } | |
b0a6fb36 | 1286 | |
08d53aa5 AB |
1287 | static int __init of_fdt_raw_init(void) |
1288 | { | |
1289 | static struct bin_attribute of_fdt_raw_attr = | |
1290 | __BIN_ATTR(fdt, S_IRUSR, of_fdt_raw_read, NULL, 0); | |
b0a6fb36 | 1291 | |
08d53aa5 AB |
1292 | if (!initial_boot_params) |
1293 | return 0; | |
b0a6fb36 | 1294 | |
08d53aa5 AB |
1295 | if (of_fdt_crc32 != crc32_be(~0, initial_boot_params, |
1296 | fdt_totalsize(initial_boot_params))) { | |
1297 | pr_warn("fdt: not creating '/sys/firmware/fdt': CRC check failed\n"); | |
1298 | return 0; | |
1299 | } | |
1300 | of_fdt_raw_attr.size = fdt_totalsize(initial_boot_params); | |
1301 | return sysfs_create_bin_file(firmware_kobj, &of_fdt_raw_attr); | |
b0a6fb36 | 1302 | } |
08d53aa5 | 1303 | late_initcall(of_fdt_raw_init); |
b0a6fb36 RH |
1304 | #endif |
1305 | ||
e6ce1324 | 1306 | #endif /* CONFIG_OF_EARLY_FLATTREE */ |