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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 | */ |
92af0899 | 94 | static 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 | ||
ecc8a96e RH |
135 | static bool of_fdt_device_is_available(const void *blob, unsigned long node) |
136 | { | |
137 | const char *status = fdt_getprop(blob, node, "status", NULL); | |
138 | ||
139 | if (!status) | |
140 | return true; | |
141 | ||
142 | if (!strcmp(status, "ok") || !strcmp(status, "okay")) | |
143 | return true; | |
144 | ||
145 | return false; | |
146 | } | |
147 | ||
a4f740cf GL |
148 | /** |
149 | * of_fdt_match - Return true if node matches a list of compatible values | |
150 | */ | |
c972de14 | 151 | int of_fdt_match(const void *blob, unsigned long node, |
7b482c83 | 152 | const char *const *compat) |
a4f740cf GL |
153 | { |
154 | unsigned int tmp, score = 0; | |
155 | ||
156 | if (!compat) | |
157 | return 0; | |
158 | ||
159 | while (*compat) { | |
160 | tmp = of_fdt_is_compatible(blob, node, *compat); | |
161 | if (tmp && (score == 0 || (tmp < score))) | |
162 | score = tmp; | |
163 | compat++; | |
164 | } | |
165 | ||
166 | return score; | |
167 | } | |
168 | ||
44856819 | 169 | static void *unflatten_dt_alloc(void **mem, unsigned long size, |
bbd33931 GL |
170 | unsigned long align) |
171 | { | |
172 | void *res; | |
173 | ||
44856819 GL |
174 | *mem = PTR_ALIGN(*mem, align); |
175 | res = *mem; | |
bbd33931 GL |
176 | *mem += size; |
177 | ||
178 | return res; | |
179 | } | |
180 | ||
dfbd4c6e GS |
181 | static void populate_properties(const void *blob, |
182 | int offset, | |
183 | void **mem, | |
184 | struct device_node *np, | |
185 | const char *nodename, | |
5063e25a | 186 | bool dryrun) |
bbd33931 | 187 | { |
dfbd4c6e GS |
188 | struct property *pp, **pprev = NULL; |
189 | int cur; | |
190 | bool has_name = false; | |
191 | ||
192 | pprev = &np->properties; | |
193 | for (cur = fdt_first_property_offset(blob, offset); | |
194 | cur >= 0; | |
195 | cur = fdt_next_property_offset(blob, cur)) { | |
196 | const __be32 *val; | |
197 | const char *pname; | |
198 | u32 sz; | |
199 | ||
200 | val = fdt_getprop_by_offset(blob, cur, &pname, &sz); | |
201 | if (!val) { | |
606ad42a | 202 | pr_warn("Cannot locate property at 0x%x\n", cur); |
dfbd4c6e GS |
203 | continue; |
204 | } | |
205 | ||
206 | if (!pname) { | |
606ad42a | 207 | pr_warn("Cannot find property name at 0x%x\n", cur); |
dfbd4c6e GS |
208 | continue; |
209 | } | |
210 | ||
211 | if (!strcmp(pname, "name")) | |
212 | has_name = true; | |
213 | ||
214 | pp = unflatten_dt_alloc(mem, sizeof(struct property), | |
215 | __alignof__(struct property)); | |
216 | if (dryrun) | |
217 | continue; | |
218 | ||
219 | /* We accept flattened tree phandles either in | |
220 | * ePAPR-style "phandle" properties, or the | |
221 | * legacy "linux,phandle" properties. If both | |
222 | * appear and have different values, things | |
223 | * will get weird. Don't do that. | |
224 | */ | |
225 | if (!strcmp(pname, "phandle") || | |
226 | !strcmp(pname, "linux,phandle")) { | |
227 | if (!np->phandle) | |
228 | np->phandle = be32_to_cpup(val); | |
229 | } | |
230 | ||
231 | /* And we process the "ibm,phandle" property | |
232 | * used in pSeries dynamic device tree | |
233 | * stuff | |
234 | */ | |
235 | if (!strcmp(pname, "ibm,phandle")) | |
236 | np->phandle = be32_to_cpup(val); | |
237 | ||
238 | pp->name = (char *)pname; | |
239 | pp->length = sz; | |
240 | pp->value = (__be32 *)val; | |
241 | *pprev = pp; | |
242 | pprev = &pp->next; | |
243 | } | |
244 | ||
245 | /* With version 0x10 we may not have the name property, | |
246 | * recreate it here from the unit name if absent | |
247 | */ | |
248 | if (!has_name) { | |
249 | const char *p = nodename, *ps = p, *pa = NULL; | |
250 | int len; | |
251 | ||
252 | while (*p) { | |
253 | if ((*p) == '@') | |
254 | pa = p; | |
255 | else if ((*p) == '/') | |
256 | ps = p + 1; | |
257 | p++; | |
258 | } | |
259 | ||
260 | if (pa < ps) | |
261 | pa = p; | |
262 | len = (pa - ps) + 1; | |
263 | pp = unflatten_dt_alloc(mem, sizeof(struct property) + len, | |
264 | __alignof__(struct property)); | |
265 | if (!dryrun) { | |
266 | pp->name = "name"; | |
267 | pp->length = len; | |
268 | pp->value = pp + 1; | |
269 | *pprev = pp; | |
270 | pprev = &pp->next; | |
271 | memcpy(pp->value, ps, len - 1); | |
272 | ((char *)pp->value)[len - 1] = 0; | |
273 | pr_debug("fixed up name for %s -> %s\n", | |
274 | nodename, (char *)pp->value); | |
275 | } | |
276 | } | |
277 | ||
278 | if (!dryrun) | |
279 | *pprev = NULL; | |
280 | } | |
281 | ||
a7e4cfb0 RH |
282 | static bool populate_node(const void *blob, |
283 | int offset, | |
284 | void **mem, | |
285 | struct device_node *dad, | |
286 | struct device_node **pnp, | |
287 | bool dryrun) | |
dfbd4c6e | 288 | { |
bbd33931 | 289 | struct device_node *np; |
e6a6928c | 290 | const char *pathp; |
bbd33931 | 291 | unsigned int l, allocl; |
bbd33931 | 292 | |
dfbd4c6e GS |
293 | pathp = fdt_get_name(blob, offset, &l); |
294 | if (!pathp) { | |
295 | *pnp = NULL; | |
a7e4cfb0 | 296 | return false; |
dfbd4c6e | 297 | } |
e6a6928c | 298 | |
05f4647b | 299 | allocl = ++l; |
bbd33931 | 300 | |
dfbd4c6e | 301 | np = unflatten_dt_alloc(mem, sizeof(struct device_node) + allocl, |
bbd33931 | 302 | __alignof__(struct device_node)); |
5063e25a | 303 | if (!dryrun) { |
c22618a1 | 304 | char *fn; |
0829f6d1 | 305 | of_node_init(np); |
c22618a1 | 306 | np->full_name = fn = ((char *)np) + sizeof(*np); |
a7e4cfb0 | 307 | |
c22618a1 GL |
308 | memcpy(fn, pathp, l); |
309 | ||
bbd33931 GL |
310 | if (dad != NULL) { |
311 | np->parent = dad; | |
70161ff3 GL |
312 | np->sibling = dad->child; |
313 | dad->child = np; | |
bbd33931 | 314 | } |
bbd33931 | 315 | } |
e6a6928c | 316 | |
dfbd4c6e | 317 | populate_properties(blob, offset, mem, np, pathp, dryrun); |
5063e25a | 318 | if (!dryrun) { |
bbd33931 GL |
319 | np->name = of_get_property(np, "name", NULL); |
320 | np->type = of_get_property(np, "device_type", NULL); | |
321 | ||
322 | if (!np->name) | |
323 | np->name = "<NULL>"; | |
324 | if (!np->type) | |
325 | np->type = "<NULL>"; | |
326 | } | |
e6a6928c | 327 | |
dfbd4c6e | 328 | *pnp = np; |
a7e4cfb0 | 329 | return true; |
dfbd4c6e GS |
330 | } |
331 | ||
50800082 GS |
332 | static void reverse_nodes(struct device_node *parent) |
333 | { | |
334 | struct device_node *child, *next; | |
335 | ||
336 | /* In-depth first */ | |
337 | child = parent->child; | |
338 | while (child) { | |
339 | reverse_nodes(child); | |
340 | ||
341 | child = child->sibling; | |
342 | } | |
343 | ||
344 | /* Reverse the nodes in the child list */ | |
345 | child = parent->child; | |
346 | parent->child = NULL; | |
347 | while (child) { | |
348 | next = child->sibling; | |
349 | ||
350 | child->sibling = parent->child; | |
351 | parent->child = child; | |
352 | child = next; | |
353 | } | |
354 | } | |
355 | ||
dfbd4c6e | 356 | /** |
947c82cb | 357 | * unflatten_dt_nodes - Alloc and populate a device_node from the flat tree |
dfbd4c6e GS |
358 | * @blob: The parent device tree blob |
359 | * @mem: Memory chunk to use for allocating device nodes and properties | |
dfbd4c6e GS |
360 | * @dad: Parent struct device_node |
361 | * @nodepp: The device_node tree created by the call | |
50800082 GS |
362 | * |
363 | * It returns the size of unflattened device tree or error code | |
dfbd4c6e | 364 | */ |
947c82cb GS |
365 | static int unflatten_dt_nodes(const void *blob, |
366 | void *mem, | |
367 | struct device_node *dad, | |
368 | struct device_node **nodepp) | |
dfbd4c6e | 369 | { |
50800082 | 370 | struct device_node *root; |
8c237cd0 | 371 | int offset = 0, depth = 0, initial_depth = 0; |
50800082 | 372 | #define FDT_MAX_DEPTH 64 |
50800082 GS |
373 | struct device_node *nps[FDT_MAX_DEPTH]; |
374 | void *base = mem; | |
375 | bool dryrun = !base; | |
dfbd4c6e | 376 | |
50800082 GS |
377 | if (nodepp) |
378 | *nodepp = NULL; | |
379 | ||
8c237cd0 GS |
380 | /* |
381 | * We're unflattening device sub-tree if @dad is valid. There are | |
382 | * possibly multiple nodes in the first level of depth. We need | |
383 | * set @depth to 1 to make fdt_next_node() happy as it bails | |
384 | * immediately when negative @depth is found. Otherwise, the device | |
385 | * nodes except the first one won't be unflattened successfully. | |
386 | */ | |
387 | if (dad) | |
388 | depth = initial_depth = 1; | |
389 | ||
50800082 | 390 | root = dad; |
78c44d91 | 391 | nps[depth] = dad; |
8c237cd0 | 392 | |
50800082 | 393 | for (offset = 0; |
8c237cd0 | 394 | offset >= 0 && depth >= initial_depth; |
50800082 GS |
395 | offset = fdt_next_node(blob, offset, &depth)) { |
396 | if (WARN_ON_ONCE(depth >= FDT_MAX_DEPTH)) | |
397 | continue; | |
dfbd4c6e | 398 | |
77ea8a68 RH |
399 | if (!IS_ENABLED(CONFIG_OF_KOBJ) && |
400 | !of_fdt_device_is_available(blob, offset)) | |
401 | continue; | |
402 | ||
a7e4cfb0 RH |
403 | if (!populate_node(blob, offset, &mem, nps[depth], |
404 | &nps[depth+1], dryrun)) | |
50800082 GS |
405 | return mem - base; |
406 | ||
407 | if (!dryrun && nodepp && !*nodepp) | |
78c44d91 | 408 | *nodepp = nps[depth+1]; |
50800082 | 409 | if (!dryrun && !root) |
78c44d91 | 410 | root = nps[depth+1]; |
50800082 | 411 | } |
e6a6928c | 412 | |
50800082 | 413 | if (offset < 0 && offset != -FDT_ERR_NOTFOUND) { |
606ad42a | 414 | pr_err("Error %d processing FDT\n", offset); |
50800082 GS |
415 | return -EINVAL; |
416 | } | |
e6a6928c | 417 | |
70161ff3 GL |
418 | /* |
419 | * Reverse the child list. Some drivers assumes node order matches .dts | |
420 | * node order | |
421 | */ | |
50800082 GS |
422 | if (!dryrun) |
423 | reverse_nodes(root); | |
e6a6928c | 424 | |
50800082 | 425 | return mem - base; |
bbd33931 | 426 | } |
41f88009 | 427 | |
fe140423 SN |
428 | /** |
429 | * __unflatten_device_tree - create tree of device_nodes from flat blob | |
430 | * | |
431 | * unflattens a device-tree, creating the | |
432 | * tree of struct device_node. It also fills the "name" and "type" | |
433 | * pointers of the nodes so the normal device-tree walking functions | |
434 | * can be used. | |
435 | * @blob: The blob to expand | |
c4263233 | 436 | * @dad: Parent device node |
fe140423 SN |
437 | * @mynodes: The device_node tree created by the call |
438 | * @dt_alloc: An allocator that provides a virtual address to memory | |
439 | * for the resulting tree | |
f5d2da67 | 440 | * @detached: if true set OF_DETACHED on @mynodes |
83262418 GS |
441 | * |
442 | * Returns NULL on failure or the memory chunk containing the unflattened | |
443 | * device tree on success. | |
fe140423 | 444 | */ |
81d0848f FR |
445 | void *__unflatten_device_tree(const void *blob, |
446 | struct device_node *dad, | |
447 | struct device_node **mynodes, | |
448 | void *(*dt_alloc)(u64 size, u64 align), | |
449 | bool detached) | |
fe140423 | 450 | { |
50800082 | 451 | int size; |
e6a6928c | 452 | void *mem; |
fe140423 SN |
453 | |
454 | pr_debug(" -> unflatten_device_tree()\n"); | |
455 | ||
456 | if (!blob) { | |
457 | pr_debug("No device tree pointer\n"); | |
83262418 | 458 | return NULL; |
fe140423 SN |
459 | } |
460 | ||
461 | pr_debug("Unflattening device tree:\n"); | |
c972de14 RH |
462 | pr_debug("magic: %08x\n", fdt_magic(blob)); |
463 | pr_debug("size: %08x\n", fdt_totalsize(blob)); | |
464 | pr_debug("version: %08x\n", fdt_version(blob)); | |
fe140423 | 465 | |
c972de14 | 466 | if (fdt_check_header(blob)) { |
fe140423 | 467 | pr_err("Invalid device tree blob header\n"); |
83262418 | 468 | return NULL; |
fe140423 SN |
469 | } |
470 | ||
471 | /* First pass, scan for size */ | |
c4263233 | 472 | size = unflatten_dt_nodes(blob, NULL, dad, NULL); |
50800082 | 473 | if (size < 0) |
83262418 | 474 | return NULL; |
fe140423 | 475 | |
50800082 GS |
476 | size = ALIGN(size, 4); |
477 | pr_debug(" size is %d, allocating...\n", size); | |
fe140423 SN |
478 | |
479 | /* Allocate memory for the expanded device tree */ | |
44856819 | 480 | mem = dt_alloc(size + 4, __alignof__(struct device_node)); |
49e67dd1 JH |
481 | if (!mem) |
482 | return NULL; | |
483 | ||
44856819 | 484 | memset(mem, 0, size); |
fe140423 | 485 | |
44856819 | 486 | *(__be32 *)(mem + size) = cpu_to_be32(0xdeadbeef); |
9e401275 | 487 | |
44856819 | 488 | pr_debug(" unflattening %p...\n", mem); |
fe140423 SN |
489 | |
490 | /* Second pass, do actual unflattening */ | |
c4263233 | 491 | unflatten_dt_nodes(blob, mem, dad, mynodes); |
44856819 | 492 | if (be32_to_cpup(mem + size) != 0xdeadbeef) |
fe140423 | 493 | pr_warning("End of tree marker overwritten: %08x\n", |
44856819 | 494 | be32_to_cpup(mem + size)); |
fe140423 | 495 | |
89c67752 | 496 | if (detached && mynodes) { |
1d1bde55 MS |
497 | of_node_set_flag(*mynodes, OF_DETACHED); |
498 | pr_debug("unflattened tree is detached\n"); | |
499 | } | |
500 | ||
fe140423 | 501 | pr_debug(" <- unflatten_device_tree()\n"); |
83262418 | 502 | return mem; |
fe140423 SN |
503 | } |
504 | ||
505 | static void *kernel_tree_alloc(u64 size, u64 align) | |
506 | { | |
507 | return kzalloc(size, GFP_KERNEL); | |
508 | } | |
509 | ||
f8062386 GR |
510 | static DEFINE_MUTEX(of_fdt_unflatten_mutex); |
511 | ||
fe140423 SN |
512 | /** |
513 | * of_fdt_unflatten_tree - create tree of device_nodes from flat blob | |
c4263233 GS |
514 | * @blob: Flat device tree blob |
515 | * @dad: Parent device node | |
516 | * @mynodes: The device tree created by the call | |
fe140423 SN |
517 | * |
518 | * unflattens the device-tree passed by the firmware, creating the | |
519 | * tree of struct device_node. It also fills the "name" and "type" | |
520 | * pointers of the nodes so the normal device-tree walking functions | |
521 | * can be used. | |
83262418 GS |
522 | * |
523 | * Returns NULL on failure or the memory chunk containing the unflattened | |
524 | * device tree on success. | |
fe140423 | 525 | */ |
83262418 GS |
526 | void *of_fdt_unflatten_tree(const unsigned long *blob, |
527 | struct device_node *dad, | |
528 | struct device_node **mynodes) | |
fe140423 | 529 | { |
83262418 GS |
530 | void *mem; |
531 | ||
f8062386 | 532 | mutex_lock(&of_fdt_unflatten_mutex); |
1d1bde55 MS |
533 | mem = __unflatten_device_tree(blob, dad, mynodes, &kernel_tree_alloc, |
534 | true); | |
f8062386 | 535 | mutex_unlock(&of_fdt_unflatten_mutex); |
83262418 GS |
536 | |
537 | return mem; | |
fe140423 SN |
538 | } |
539 | EXPORT_SYMBOL_GPL(of_fdt_unflatten_tree); | |
540 | ||
57d00ecf SN |
541 | /* Everything below here references initial_boot_params directly. */ |
542 | int __initdata dt_root_addr_cells; | |
543 | int __initdata dt_root_size_cells; | |
544 | ||
1daa0c4c | 545 | void *initial_boot_params; |
57d00ecf SN |
546 | |
547 | #ifdef CONFIG_OF_EARLY_FLATTREE | |
548 | ||
08d53aa5 AB |
549 | static u32 of_fdt_crc32; |
550 | ||
e8d9d1f5 MS |
551 | /** |
552 | * res_mem_reserve_reg() - reserve all memory described in 'reg' property | |
553 | */ | |
554 | static int __init __reserved_mem_reserve_reg(unsigned long node, | |
555 | const char *uname) | |
556 | { | |
557 | int t_len = (dt_root_addr_cells + dt_root_size_cells) * sizeof(__be32); | |
558 | phys_addr_t base, size; | |
9d0c4dfe RH |
559 | int len; |
560 | const __be32 *prop; | |
3f0c8206 | 561 | int nomap, first = 1; |
e8d9d1f5 MS |
562 | |
563 | prop = of_get_flat_dt_prop(node, "reg", &len); | |
564 | if (!prop) | |
565 | return -ENOENT; | |
566 | ||
567 | if (len && len % t_len != 0) { | |
568 | pr_err("Reserved memory: invalid reg property in '%s', skipping node.\n", | |
569 | uname); | |
570 | return -EINVAL; | |
571 | } | |
572 | ||
573 | nomap = of_get_flat_dt_prop(node, "no-map", NULL) != NULL; | |
574 | ||
575 | while (len >= t_len) { | |
576 | base = dt_mem_next_cell(dt_root_addr_cells, &prop); | |
577 | size = dt_mem_next_cell(dt_root_size_cells, &prop); | |
578 | ||
b5f2a8c0 | 579 | if (size && |
e8d9d1f5 MS |
580 | early_init_dt_reserve_memory_arch(base, size, nomap) == 0) |
581 | pr_debug("Reserved memory: reserved region for node '%s': base %pa, size %ld MiB\n", | |
582 | uname, &base, (unsigned long)size / SZ_1M); | |
583 | else | |
584 | pr_info("Reserved memory: failed to reserve memory for node '%s': base %pa, size %ld MiB\n", | |
585 | uname, &base, (unsigned long)size / SZ_1M); | |
586 | ||
587 | len -= t_len; | |
3f0c8206 MS |
588 | if (first) { |
589 | fdt_reserved_mem_save_node(node, uname, base, size); | |
590 | first = 0; | |
591 | } | |
e8d9d1f5 MS |
592 | } |
593 | return 0; | |
594 | } | |
595 | ||
596 | /** | |
597 | * __reserved_mem_check_root() - check if #size-cells, #address-cells provided | |
598 | * in /reserved-memory matches the values supported by the current implementation, | |
599 | * also check if ranges property has been provided | |
600 | */ | |
5b624118 | 601 | static int __init __reserved_mem_check_root(unsigned long node) |
e8d9d1f5 | 602 | { |
9d0c4dfe | 603 | const __be32 *prop; |
e8d9d1f5 MS |
604 | |
605 | prop = of_get_flat_dt_prop(node, "#size-cells", NULL); | |
606 | if (!prop || be32_to_cpup(prop) != dt_root_size_cells) | |
607 | return -EINVAL; | |
608 | ||
609 | prop = of_get_flat_dt_prop(node, "#address-cells", NULL); | |
610 | if (!prop || be32_to_cpup(prop) != dt_root_addr_cells) | |
611 | return -EINVAL; | |
612 | ||
613 | prop = of_get_flat_dt_prop(node, "ranges", NULL); | |
614 | if (!prop) | |
615 | return -EINVAL; | |
616 | return 0; | |
617 | } | |
618 | ||
619 | /** | |
620 | * fdt_scan_reserved_mem() - scan a single FDT node for reserved memory | |
621 | */ | |
622 | static int __init __fdt_scan_reserved_mem(unsigned long node, const char *uname, | |
623 | int depth, void *data) | |
624 | { | |
625 | static int found; | |
3f0c8206 | 626 | int err; |
e8d9d1f5 MS |
627 | |
628 | if (!found && depth == 1 && strcmp(uname, "reserved-memory") == 0) { | |
629 | if (__reserved_mem_check_root(node) != 0) { | |
630 | pr_err("Reserved memory: unsupported node format, ignoring\n"); | |
631 | /* break scan */ | |
632 | return 1; | |
633 | } | |
634 | found = 1; | |
635 | /* scan next node */ | |
636 | return 0; | |
637 | } else if (!found) { | |
638 | /* scan next node */ | |
639 | return 0; | |
640 | } else if (found && depth < 2) { | |
641 | /* scanning of /reserved-memory has been finished */ | |
642 | return 1; | |
643 | } | |
644 | ||
ecc8a96e | 645 | if (!of_fdt_device_is_available(initial_boot_params, node)) |
e8d9d1f5 MS |
646 | return 0; |
647 | ||
3f0c8206 MS |
648 | err = __reserved_mem_reserve_reg(node, uname); |
649 | if (err == -ENOENT && of_get_flat_dt_prop(node, "size", NULL)) | |
650 | fdt_reserved_mem_save_node(node, uname, 0, 0); | |
e8d9d1f5 MS |
651 | |
652 | /* scan next node */ | |
653 | return 0; | |
654 | } | |
655 | ||
656 | /** | |
657 | * early_init_fdt_scan_reserved_mem() - create reserved memory regions | |
658 | * | |
659 | * This function grabs memory from early allocator for device exclusive use | |
660 | * defined in device tree structures. It should be called by arch specific code | |
661 | * once the early allocator (i.e. memblock) has been fully activated. | |
662 | */ | |
663 | void __init early_init_fdt_scan_reserved_mem(void) | |
664 | { | |
d1552ce4 RH |
665 | int n; |
666 | u64 base, size; | |
667 | ||
2040b527 JC |
668 | if (!initial_boot_params) |
669 | return; | |
670 | ||
d1552ce4 RH |
671 | /* Process header /memreserve/ fields */ |
672 | for (n = 0; ; n++) { | |
673 | fdt_get_mem_rsv(initial_boot_params, n, &base, &size); | |
674 | if (!size) | |
675 | break; | |
676 | early_init_dt_reserve_memory_arch(base, size, 0); | |
677 | } | |
678 | ||
e8d9d1f5 | 679 | of_scan_flat_dt(__fdt_scan_reserved_mem, NULL); |
3f0c8206 | 680 | fdt_init_reserved_mem(); |
e8d9d1f5 MS |
681 | } |
682 | ||
24bbd929 AB |
683 | /** |
684 | * early_init_fdt_reserve_self() - reserve the memory used by the FDT blob | |
685 | */ | |
686 | void __init early_init_fdt_reserve_self(void) | |
687 | { | |
688 | if (!initial_boot_params) | |
689 | return; | |
690 | ||
691 | /* Reserve the dtb region */ | |
692 | early_init_dt_reserve_memory_arch(__pa(initial_boot_params), | |
693 | fdt_totalsize(initial_boot_params), | |
694 | 0); | |
695 | } | |
696 | ||
57d00ecf SN |
697 | /** |
698 | * of_scan_flat_dt - scan flattened tree blob and call callback on each. | |
699 | * @it: callback function | |
700 | * @data: context data pointer | |
701 | * | |
702 | * This function is used to scan the flattened device-tree, it is | |
703 | * used to extract the memory information at boot before we can | |
704 | * unflatten the tree | |
705 | */ | |
706 | int __init of_scan_flat_dt(int (*it)(unsigned long node, | |
707 | const char *uname, int depth, | |
708 | void *data), | |
709 | void *data) | |
710 | { | |
e6a6928c RH |
711 | const void *blob = initial_boot_params; |
712 | const char *pathp; | |
713 | int offset, rc = 0, depth = -1; | |
714 | ||
3ec75441 TW |
715 | if (!blob) |
716 | return 0; | |
717 | ||
718 | for (offset = fdt_next_node(blob, -1, &depth); | |
719 | offset >= 0 && depth >= 0 && !rc; | |
720 | offset = fdt_next_node(blob, offset, &depth)) { | |
e6a6928c RH |
721 | |
722 | pathp = fdt_get_name(blob, offset, NULL); | |
375da3a7 AS |
723 | if (*pathp == '/') |
724 | pathp = kbasename(pathp); | |
e6a6928c RH |
725 | rc = it(offset, pathp, depth, data); |
726 | } | |
57d00ecf SN |
727 | return rc; |
728 | } | |
729 | ||
ea47dd19 NP |
730 | /** |
731 | * of_scan_flat_dt_subnodes - scan sub-nodes of a node call callback on each. | |
732 | * @it: callback function | |
733 | * @data: context data pointer | |
734 | * | |
735 | * This function is used to scan sub-nodes of a node. | |
736 | */ | |
737 | int __init of_scan_flat_dt_subnodes(unsigned long parent, | |
738 | int (*it)(unsigned long node, | |
739 | const char *uname, | |
740 | void *data), | |
741 | void *data) | |
742 | { | |
743 | const void *blob = initial_boot_params; | |
744 | int node; | |
745 | ||
746 | fdt_for_each_subnode(node, blob, parent) { | |
747 | const char *pathp; | |
748 | int rc; | |
749 | ||
750 | pathp = fdt_get_name(blob, node, NULL); | |
751 | if (*pathp == '/') | |
752 | pathp = kbasename(pathp); | |
753 | rc = it(node, pathp, data); | |
754 | if (rc) | |
755 | return rc; | |
756 | } | |
757 | return 0; | |
758 | } | |
759 | ||
9c609868 SZ |
760 | /** |
761 | * of_get_flat_dt_subnode_by_name - get the subnode by given name | |
762 | * | |
763 | * @node: the parent node | |
764 | * @uname: the name of subnode | |
765 | * @return offset of the subnode, or -FDT_ERR_NOTFOUND if there is none | |
766 | */ | |
767 | ||
768 | int of_get_flat_dt_subnode_by_name(unsigned long node, const char *uname) | |
769 | { | |
770 | return fdt_subnode_offset(initial_boot_params, node, uname); | |
771 | } | |
772 | ||
57d00ecf SN |
773 | /** |
774 | * of_get_flat_dt_root - find the root node in the flat blob | |
775 | */ | |
776 | unsigned long __init of_get_flat_dt_root(void) | |
777 | { | |
e6a6928c | 778 | return 0; |
57d00ecf SN |
779 | } |
780 | ||
c0556d3f RH |
781 | /** |
782 | * of_get_flat_dt_size - Return the total size of the FDT | |
783 | */ | |
784 | int __init of_get_flat_dt_size(void) | |
785 | { | |
786 | return fdt_totalsize(initial_boot_params); | |
787 | } | |
788 | ||
57d00ecf SN |
789 | /** |
790 | * of_get_flat_dt_prop - Given a node in the flat blob, return the property ptr | |
791 | * | |
792 | * This function can be used within scan_flattened_dt callback to get | |
793 | * access to properties | |
794 | */ | |
9d0c4dfe RH |
795 | const void *__init of_get_flat_dt_prop(unsigned long node, const char *name, |
796 | int *size) | |
57d00ecf | 797 | { |
e6a6928c | 798 | return fdt_getprop(initial_boot_params, node, name, size); |
57d00ecf SN |
799 | } |
800 | ||
801 | /** | |
802 | * of_flat_dt_is_compatible - Return true if given node has compat in compatible list | |
803 | * @node: node to test | |
804 | * @compat: compatible string to compare with compatible list. | |
805 | */ | |
806 | int __init of_flat_dt_is_compatible(unsigned long node, const char *compat) | |
807 | { | |
808 | return of_fdt_is_compatible(initial_boot_params, node, compat); | |
809 | } | |
810 | ||
a4f740cf GL |
811 | /** |
812 | * of_flat_dt_match - Return true if node matches a list of compatible values | |
813 | */ | |
7b482c83 | 814 | int __init of_flat_dt_match(unsigned long node, const char *const *compat) |
a4f740cf GL |
815 | { |
816 | return of_fdt_match(initial_boot_params, node, compat); | |
817 | } | |
818 | ||
ea47dd19 NP |
819 | /** |
820 | * of_get_flat_dt_prop - Given a node in the flat blob, return the phandle | |
821 | */ | |
822 | uint32_t __init of_get_flat_dt_phandle(unsigned long node) | |
823 | { | |
824 | return fdt_get_phandle(initial_boot_params, node); | |
825 | } | |
826 | ||
57d74bcf MS |
827 | struct fdt_scan_status { |
828 | const char *name; | |
829 | int namelen; | |
830 | int depth; | |
831 | int found; | |
832 | int (*iterator)(unsigned long node, const char *uname, int depth, void *data); | |
833 | void *data; | |
834 | }; | |
835 | ||
6a903a25 RH |
836 | const char * __init of_flat_dt_get_machine_name(void) |
837 | { | |
838 | const char *name; | |
839 | unsigned long dt_root = of_get_flat_dt_root(); | |
840 | ||
841 | name = of_get_flat_dt_prop(dt_root, "model", NULL); | |
842 | if (!name) | |
843 | name = of_get_flat_dt_prop(dt_root, "compatible", NULL); | |
844 | return name; | |
845 | } | |
846 | ||
847 | /** | |
848 | * of_flat_dt_match_machine - Iterate match tables to find matching machine. | |
849 | * | |
850 | * @default_match: A machine specific ptr to return in case of no match. | |
851 | * @get_next_compat: callback function to return next compatible match table. | |
852 | * | |
853 | * Iterate through machine match tables to find the best match for the machine | |
854 | * compatible string in the FDT. | |
855 | */ | |
856 | const void * __init of_flat_dt_match_machine(const void *default_match, | |
857 | const void * (*get_next_compat)(const char * const**)) | |
858 | { | |
859 | const void *data = NULL; | |
860 | const void *best_data = default_match; | |
861 | const char *const *compat; | |
862 | unsigned long dt_root; | |
863 | unsigned int best_score = ~1, score = 0; | |
864 | ||
865 | dt_root = of_get_flat_dt_root(); | |
866 | while ((data = get_next_compat(&compat))) { | |
867 | score = of_flat_dt_match(dt_root, compat); | |
868 | if (score > 0 && score < best_score) { | |
869 | best_data = data; | |
870 | best_score = score; | |
871 | } | |
872 | } | |
873 | if (!best_data) { | |
874 | const char *prop; | |
9d0c4dfe | 875 | int size; |
6a903a25 RH |
876 | |
877 | pr_err("\n unrecognized device tree list:\n[ "); | |
878 | ||
879 | prop = of_get_flat_dt_prop(dt_root, "compatible", &size); | |
880 | if (prop) { | |
881 | while (size > 0) { | |
882 | printk("'%s' ", prop); | |
883 | size -= strlen(prop) + 1; | |
884 | prop += strlen(prop) + 1; | |
885 | } | |
886 | } | |
887 | printk("]\n\n"); | |
888 | return NULL; | |
889 | } | |
890 | ||
891 | pr_info("Machine model: %s\n", of_flat_dt_get_machine_name()); | |
892 | ||
893 | return best_data; | |
894 | } | |
895 | ||
f7b3a835 | 896 | #ifdef CONFIG_BLK_DEV_INITRD |
369bc9ab AB |
897 | #ifndef __early_init_dt_declare_initrd |
898 | static void __early_init_dt_declare_initrd(unsigned long start, | |
899 | unsigned long end) | |
900 | { | |
901 | initrd_start = (unsigned long)__va(start); | |
902 | initrd_end = (unsigned long)__va(end); | |
903 | initrd_below_start_ok = 1; | |
904 | } | |
905 | #endif | |
906 | ||
f7b3a835 GL |
907 | /** |
908 | * early_init_dt_check_for_initrd - Decode initrd location from flat tree | |
909 | * @node: reference to node containing initrd location ('chosen') | |
910 | */ | |
29eb45a9 | 911 | static void __init early_init_dt_check_for_initrd(unsigned long node) |
f7b3a835 | 912 | { |
374d5c99 | 913 | u64 start, end; |
9d0c4dfe RH |
914 | int len; |
915 | const __be32 *prop; | |
f7b3a835 GL |
916 | |
917 | pr_debug("Looking for initrd properties... "); | |
918 | ||
919 | prop = of_get_flat_dt_prop(node, "linux,initrd-start", &len); | |
1406bc2f JK |
920 | if (!prop) |
921 | return; | |
374d5c99 | 922 | start = of_read_number(prop, len/4); |
1406bc2f JK |
923 | |
924 | prop = of_get_flat_dt_prop(node, "linux,initrd-end", &len); | |
925 | if (!prop) | |
926 | return; | |
374d5c99 | 927 | end = of_read_number(prop, len/4); |
f7b3a835 | 928 | |
369bc9ab | 929 | __early_init_dt_declare_initrd(start, end); |
29eb45a9 | 930 | |
374d5c99 SS |
931 | pr_debug("initrd_start=0x%llx initrd_end=0x%llx\n", |
932 | (unsigned long long)start, (unsigned long long)end); | |
f7b3a835 GL |
933 | } |
934 | #else | |
29eb45a9 | 935 | static inline void early_init_dt_check_for_initrd(unsigned long node) |
f7b3a835 GL |
936 | { |
937 | } | |
938 | #endif /* CONFIG_BLK_DEV_INITRD */ | |
939 | ||
fb11ffe7 | 940 | #ifdef CONFIG_SERIAL_EARLYCON |
fb11ffe7 | 941 | |
d503187b | 942 | int __init early_init_dt_scan_chosen_stdout(void) |
fb11ffe7 RH |
943 | { |
944 | int offset; | |
4d118c9a | 945 | const char *p, *q, *options = NULL; |
fb11ffe7 | 946 | int l; |
1f67d7a5 | 947 | const struct earlycon_id **p_match; |
fb11ffe7 RH |
948 | const void *fdt = initial_boot_params; |
949 | ||
950 | offset = fdt_path_offset(fdt, "/chosen"); | |
951 | if (offset < 0) | |
952 | offset = fdt_path_offset(fdt, "/chosen@0"); | |
953 | if (offset < 0) | |
954 | return -ENOENT; | |
955 | ||
956 | p = fdt_getprop(fdt, offset, "stdout-path", &l); | |
957 | if (!p) | |
958 | p = fdt_getprop(fdt, offset, "linux,stdout-path", &l); | |
959 | if (!p || !l) | |
960 | return -ENOENT; | |
961 | ||
4d118c9a PH |
962 | q = strchrnul(p, ':'); |
963 | if (*q != '\0') | |
964 | options = q + 1; | |
0fcc286f | 965 | l = q - p; |
6296ad9e | 966 | |
fb11ffe7 | 967 | /* Get the node specified by stdout-path */ |
0fcc286f PH |
968 | offset = fdt_path_offset_namelen(fdt, p, l); |
969 | if (offset < 0) { | |
970 | pr_warn("earlycon: stdout-path %.*s not found\n", l, p); | |
971 | return 0; | |
972 | } | |
fb11ffe7 | 973 | |
1f67d7a5 DK |
974 | for (p_match = __earlycon_table; p_match < __earlycon_table_end; |
975 | p_match++) { | |
976 | const struct earlycon_id *match = *p_match; | |
977 | ||
2eaa7909 PH |
978 | if (!match->compatible[0]) |
979 | continue; | |
980 | ||
981 | if (fdt_node_check_compatible(fdt, offset, match->compatible)) | |
fb11ffe7 | 982 | continue; |
fb11ffe7 | 983 | |
c90fe9c0 | 984 | of_setup_earlycon(match, offset, options); |
fb11ffe7 RH |
985 | return 0; |
986 | } | |
987 | return -ENODEV; | |
988 | } | |
fb11ffe7 RH |
989 | #endif |
990 | ||
f00abd94 GL |
991 | /** |
992 | * early_init_dt_scan_root - fetch the top level address and size cells | |
993 | */ | |
994 | int __init early_init_dt_scan_root(unsigned long node, const char *uname, | |
995 | int depth, void *data) | |
996 | { | |
9d0c4dfe | 997 | const __be32 *prop; |
f00abd94 GL |
998 | |
999 | if (depth != 0) | |
1000 | return 0; | |
1001 | ||
33714881 JK |
1002 | dt_root_size_cells = OF_ROOT_NODE_SIZE_CELLS_DEFAULT; |
1003 | dt_root_addr_cells = OF_ROOT_NODE_ADDR_CELLS_DEFAULT; | |
1004 | ||
f00abd94 | 1005 | prop = of_get_flat_dt_prop(node, "#size-cells", NULL); |
33714881 JK |
1006 | if (prop) |
1007 | dt_root_size_cells = be32_to_cpup(prop); | |
f00abd94 GL |
1008 | pr_debug("dt_root_size_cells = %x\n", dt_root_size_cells); |
1009 | ||
1010 | prop = of_get_flat_dt_prop(node, "#address-cells", NULL); | |
33714881 JK |
1011 | if (prop) |
1012 | dt_root_addr_cells = be32_to_cpup(prop); | |
f00abd94 GL |
1013 | pr_debug("dt_root_addr_cells = %x\n", dt_root_addr_cells); |
1014 | ||
1015 | /* break now */ | |
1016 | return 1; | |
1017 | } | |
1018 | ||
9d0c4dfe | 1019 | u64 __init dt_mem_next_cell(int s, const __be32 **cellp) |
83f7a06e | 1020 | { |
9d0c4dfe | 1021 | const __be32 *p = *cellp; |
83f7a06e GL |
1022 | |
1023 | *cellp = p + s; | |
1024 | return of_read_number(p, s); | |
1025 | } | |
1026 | ||
51975db0 | 1027 | /** |
0ef5adca | 1028 | * early_init_dt_scan_memory - Look for and parse memory nodes |
51975db0 GL |
1029 | */ |
1030 | int __init early_init_dt_scan_memory(unsigned long node, const char *uname, | |
1031 | int depth, void *data) | |
1032 | { | |
9d0c4dfe RH |
1033 | const char *type = of_get_flat_dt_prop(node, "device_type", NULL); |
1034 | const __be32 *reg, *endp; | |
1035 | int l; | |
41a9ada3 | 1036 | bool hotpluggable; |
51975db0 GL |
1037 | |
1038 | /* We are scanning "memory" nodes only */ | |
1039 | if (type == NULL) { | |
1040 | /* | |
1041 | * The longtrail doesn't have a device_type on the | |
1042 | * /memory node, so look for the node called /memory@0. | |
1043 | */ | |
b44aa25d | 1044 | if (!IS_ENABLED(CONFIG_PPC32) || depth != 1 || strcmp(uname, "memory@0") != 0) |
51975db0 GL |
1045 | return 0; |
1046 | } else if (strcmp(type, "memory") != 0) | |
1047 | return 0; | |
1048 | ||
1049 | reg = of_get_flat_dt_prop(node, "linux,usable-memory", &l); | |
1050 | if (reg == NULL) | |
1051 | reg = of_get_flat_dt_prop(node, "reg", &l); | |
1052 | if (reg == NULL) | |
1053 | return 0; | |
1054 | ||
1055 | endp = reg + (l / sizeof(__be32)); | |
41a9ada3 | 1056 | hotpluggable = of_get_flat_dt_prop(node, "hotpluggable", NULL); |
51975db0 | 1057 | |
c954b36e | 1058 | pr_debug("memory scan node %s, reg size %d,\n", uname, l); |
51975db0 GL |
1059 | |
1060 | while ((endp - reg) >= (dt_root_addr_cells + dt_root_size_cells)) { | |
1061 | u64 base, size; | |
1062 | ||
1063 | base = dt_mem_next_cell(dt_root_addr_cells, ®); | |
1064 | size = dt_mem_next_cell(dt_root_size_cells, ®); | |
1065 | ||
1066 | if (size == 0) | |
1067 | continue; | |
1068 | pr_debug(" - %llx , %llx\n", (unsigned long long)base, | |
1069 | (unsigned long long)size); | |
1070 | ||
1071 | early_init_dt_add_memory_arch(base, size); | |
41a9ada3 RA |
1072 | |
1073 | if (!hotpluggable) | |
1074 | continue; | |
1075 | ||
1076 | if (early_init_dt_mark_hotplug_memory_arch(base, size)) | |
1077 | pr_warn("failed to mark hotplug range 0x%llx - 0x%llx\n", | |
1078 | base, base + size); | |
51975db0 GL |
1079 | } |
1080 | ||
1081 | return 0; | |
1082 | } | |
1083 | ||
86e03221 GL |
1084 | int __init early_init_dt_scan_chosen(unsigned long node, const char *uname, |
1085 | int depth, void *data) | |
1086 | { | |
9d0c4dfe RH |
1087 | int l; |
1088 | const char *p; | |
86e03221 GL |
1089 | |
1090 | pr_debug("search \"chosen\", depth: %d, uname: %s\n", depth, uname); | |
1091 | ||
85f60ae4 | 1092 | if (depth != 1 || !data || |
86e03221 GL |
1093 | (strcmp(uname, "chosen") != 0 && strcmp(uname, "chosen@0") != 0)) |
1094 | return 0; | |
1095 | ||
1096 | early_init_dt_check_for_initrd(node); | |
1097 | ||
25985edc | 1098 | /* Retrieve command line */ |
86e03221 GL |
1099 | p = of_get_flat_dt_prop(node, "bootargs", &l); |
1100 | if (p != NULL && l > 0) | |
85f60ae4 | 1101 | strlcpy(data, p, min((int)l, COMMAND_LINE_SIZE)); |
86e03221 | 1102 | |
78b782cb BH |
1103 | /* |
1104 | * CONFIG_CMDLINE is meant to be a default in case nothing else | |
1105 | * managed to set the command line, unless CONFIG_CMDLINE_FORCE | |
1106 | * is set in which case we override whatever was found earlier. | |
1107 | */ | |
86e03221 | 1108 | #ifdef CONFIG_CMDLINE |
34b82026 MU |
1109 | #if defined(CONFIG_CMDLINE_EXTEND) |
1110 | strlcat(data, " ", COMMAND_LINE_SIZE); | |
1111 | strlcat(data, CONFIG_CMDLINE, COMMAND_LINE_SIZE); | |
1112 | #elif defined(CONFIG_CMDLINE_FORCE) | |
1113 | strlcpy(data, CONFIG_CMDLINE, COMMAND_LINE_SIZE); | |
1114 | #else | |
1115 | /* No arguments from boot loader, use kernel's cmdl*/ | |
78b782cb | 1116 | if (!((char *)data)[0]) |
85f60ae4 | 1117 | strlcpy(data, CONFIG_CMDLINE, COMMAND_LINE_SIZE); |
34b82026 | 1118 | #endif |
86e03221 GL |
1119 | #endif /* CONFIG_CMDLINE */ |
1120 | ||
85f60ae4 | 1121 | pr_debug("Command line is: %s\n", (char*)data); |
86e03221 GL |
1122 | |
1123 | /* break now */ | |
1124 | return 1; | |
1125 | } | |
1126 | ||
a1727da5 | 1127 | #ifdef CONFIG_HAVE_MEMBLOCK |
270522a0 AB |
1128 | #ifndef MIN_MEMBLOCK_ADDR |
1129 | #define MIN_MEMBLOCK_ADDR __pa(PAGE_OFFSET) | |
1130 | #endif | |
8eafeb48 AB |
1131 | #ifndef MAX_MEMBLOCK_ADDR |
1132 | #define MAX_MEMBLOCK_ADDR ((phys_addr_t)~0) | |
1133 | #endif | |
3069f0c0 | 1134 | |
068f6310 RH |
1135 | void __init __weak early_init_dt_add_memory_arch(u64 base, u64 size) |
1136 | { | |
270522a0 | 1137 | const u64 phys_offset = MIN_MEMBLOCK_ADDR; |
8f73d4b7 GU |
1138 | |
1139 | if (!PAGE_ALIGNED(base)) { | |
8cccffc5 AB |
1140 | if (size < PAGE_SIZE - (base & ~PAGE_MASK)) { |
1141 | pr_warn("Ignoring memory block 0x%llx - 0x%llx\n", | |
1142 | base, base + size); | |
1143 | return; | |
1144 | } | |
8f73d4b7 GU |
1145 | size -= PAGE_SIZE - (base & ~PAGE_MASK); |
1146 | base = PAGE_ALIGN(base); | |
1147 | } | |
068f6310 | 1148 | size &= PAGE_MASK; |
a67a6ed1 | 1149 | |
8eafeb48 | 1150 | if (base > MAX_MEMBLOCK_ADDR) { |
3069f0c0 LA |
1151 | pr_warning("Ignoring memory block 0x%llx - 0x%llx\n", |
1152 | base, base + size); | |
1153 | return; | |
1154 | } | |
a67a6ed1 | 1155 | |
8eafeb48 | 1156 | if (base + size - 1 > MAX_MEMBLOCK_ADDR) { |
9aacd602 | 1157 | pr_warning("Ignoring memory range 0x%llx - 0x%llx\n", |
8eafeb48 AB |
1158 | ((u64)MAX_MEMBLOCK_ADDR) + 1, base + size); |
1159 | size = MAX_MEMBLOCK_ADDR - base + 1; | |
a67a6ed1 LA |
1160 | } |
1161 | ||
068f6310 RH |
1162 | if (base + size < phys_offset) { |
1163 | pr_warning("Ignoring memory block 0x%llx - 0x%llx\n", | |
1164 | base, base + size); | |
1165 | return; | |
1166 | } | |
1167 | if (base < phys_offset) { | |
1168 | pr_warning("Ignoring memory range 0x%llx - 0x%llx\n", | |
1169 | base, phys_offset); | |
1170 | size -= phys_offset - base; | |
1171 | base = phys_offset; | |
1172 | } | |
1173 | memblock_add(base, size); | |
1174 | } | |
1175 | ||
41a9ada3 RA |
1176 | int __init __weak early_init_dt_mark_hotplug_memory_arch(u64 base, u64 size) |
1177 | { | |
1178 | return memblock_mark_hotplug(base, size); | |
1179 | } | |
1180 | ||
e8d9d1f5 MS |
1181 | int __init __weak early_init_dt_reserve_memory_arch(phys_addr_t base, |
1182 | phys_addr_t size, bool nomap) | |
1183 | { | |
e8d9d1f5 MS |
1184 | if (nomap) |
1185 | return memblock_remove(base, size); | |
1186 | return memblock_reserve(base, size); | |
1187 | } | |
1188 | ||
a1727da5 GL |
1189 | /* |
1190 | * called from unflatten_device_tree() to bootstrap devicetree itself | |
1191 | * Architectures can override this definition if memblock isn't used | |
1192 | */ | |
1193 | void * __init __weak early_init_dt_alloc_memory_arch(u64 size, u64 align) | |
1194 | { | |
1195 | return __va(memblock_alloc(size, align)); | |
1196 | } | |
e8d9d1f5 | 1197 | #else |
aefc7ec2 RH |
1198 | void __init __weak early_init_dt_add_memory_arch(u64 base, u64 size) |
1199 | { | |
1200 | WARN_ON(1); | |
1201 | } | |
1202 | ||
41a9ada3 RA |
1203 | int __init __weak early_init_dt_mark_hotplug_memory_arch(u64 base, u64 size) |
1204 | { | |
1205 | return -ENOSYS; | |
1206 | } | |
1207 | ||
e8d9d1f5 MS |
1208 | int __init __weak early_init_dt_reserve_memory_arch(phys_addr_t base, |
1209 | phys_addr_t size, bool nomap) | |
1210 | { | |
78bb2abe | 1211 | pr_err("Reserved memory not supported, ignoring range %pa - %pa%s\n", |
1d1a661d | 1212 | &base, &size, nomap ? " (nomap)" : ""); |
e8d9d1f5 MS |
1213 | return -ENOSYS; |
1214 | } | |
aefc7ec2 RH |
1215 | |
1216 | void * __init __weak early_init_dt_alloc_memory_arch(u64 size, u64 align) | |
1217 | { | |
1218 | WARN_ON(1); | |
1219 | return NULL; | |
1220 | } | |
a1727da5 GL |
1221 | #endif |
1222 | ||
4972a74b | 1223 | bool __init early_init_dt_verify(void *params) |
0288ffcb RH |
1224 | { |
1225 | if (!params) | |
1226 | return false; | |
1227 | ||
0288ffcb | 1228 | /* check device tree validity */ |
50ba08f3 | 1229 | if (fdt_check_header(params)) |
0288ffcb | 1230 | return false; |
0288ffcb | 1231 | |
50ba08f3 BH |
1232 | /* Setup flat device-tree pointer */ |
1233 | initial_boot_params = params; | |
08d53aa5 AB |
1234 | of_fdt_crc32 = crc32_be(~0, initial_boot_params, |
1235 | fdt_totalsize(initial_boot_params)); | |
4972a74b LA |
1236 | return true; |
1237 | } | |
1238 | ||
1239 | ||
1240 | void __init early_init_dt_scan_nodes(void) | |
1241 | { | |
0288ffcb RH |
1242 | /* Retrieve various information from the /chosen node */ |
1243 | of_scan_flat_dt(early_init_dt_scan_chosen, boot_command_line); | |
1244 | ||
1245 | /* Initialize {size,address}-cells info */ | |
1246 | of_scan_flat_dt(early_init_dt_scan_root, NULL); | |
1247 | ||
1248 | /* Setup memory, calling early_init_dt_add_memory_arch */ | |
1249 | of_scan_flat_dt(early_init_dt_scan_memory, NULL); | |
4972a74b LA |
1250 | } |
1251 | ||
1252 | bool __init early_init_dt_scan(void *params) | |
1253 | { | |
1254 | bool status; | |
1255 | ||
1256 | status = early_init_dt_verify(params); | |
1257 | if (!status) | |
1258 | return false; | |
0288ffcb | 1259 | |
4972a74b | 1260 | early_init_dt_scan_nodes(); |
0288ffcb RH |
1261 | return true; |
1262 | } | |
1263 | ||
41f88009 GL |
1264 | /** |
1265 | * unflatten_device_tree - create tree of device_nodes from flat blob | |
1266 | * | |
1267 | * unflattens the device-tree passed by the firmware, creating the | |
1268 | * tree of struct device_node. It also fills the "name" and "type" | |
1269 | * pointers of the nodes so the normal device-tree walking functions | |
1270 | * can be used. | |
1271 | */ | |
1272 | void __init unflatten_device_tree(void) | |
1273 | { | |
c4263233 | 1274 | __unflatten_device_tree(initial_boot_params, NULL, &of_root, |
1d1bde55 | 1275 | early_init_dt_alloc_memory_arch, false); |
41f88009 | 1276 | |
4c7d6361 | 1277 | /* Get pointer to "/chosen" and "/aliases" nodes for use everywhere */ |
611cad72 | 1278 | of_alias_scan(early_init_dt_alloc_memory_arch); |
81d0848f FR |
1279 | |
1280 | unittest_unflatten_overlay_base(); | |
41f88009 | 1281 | } |
e6ce1324 | 1282 | |
a8bf7527 RH |
1283 | /** |
1284 | * unflatten_and_copy_device_tree - copy and create tree of device_nodes from flat blob | |
1285 | * | |
1286 | * Copies and unflattens the device-tree passed by the firmware, creating the | |
1287 | * tree of struct device_node. It also fills the "name" and "type" | |
1288 | * pointers of the nodes so the normal device-tree walking functions | |
1289 | * can be used. This should only be used when the FDT memory has not been | |
1290 | * reserved such is the case when the FDT is built-in to the kernel init | |
1291 | * section. If the FDT memory is reserved already then unflatten_device_tree | |
1292 | * should be used instead. | |
1293 | */ | |
1294 | void __init unflatten_and_copy_device_tree(void) | |
1295 | { | |
6f041e99 JH |
1296 | int size; |
1297 | void *dt; | |
1298 | ||
1299 | if (!initial_boot_params) { | |
1300 | pr_warn("No valid device tree found, continuing without\n"); | |
1301 | return; | |
1302 | } | |
1303 | ||
c972de14 | 1304 | size = fdt_totalsize(initial_boot_params); |
6f041e99 | 1305 | dt = early_init_dt_alloc_memory_arch(size, |
c972de14 | 1306 | roundup_pow_of_two(FDT_V17_SIZE)); |
a8bf7527 RH |
1307 | |
1308 | if (dt) { | |
1309 | memcpy(dt, initial_boot_params, size); | |
1310 | initial_boot_params = dt; | |
1311 | } | |
1312 | unflatten_device_tree(); | |
1313 | } | |
1314 | ||
08d53aa5 AB |
1315 | #ifdef CONFIG_SYSFS |
1316 | static ssize_t of_fdt_raw_read(struct file *filp, struct kobject *kobj, | |
1317 | struct bin_attribute *bin_attr, | |
1318 | char *buf, loff_t off, size_t count) | |
b0a6fb36 | 1319 | { |
08d53aa5 AB |
1320 | memcpy(buf, initial_boot_params + off, count); |
1321 | return count; | |
1322 | } | |
b0a6fb36 | 1323 | |
08d53aa5 AB |
1324 | static int __init of_fdt_raw_init(void) |
1325 | { | |
1326 | static struct bin_attribute of_fdt_raw_attr = | |
1327 | __BIN_ATTR(fdt, S_IRUSR, of_fdt_raw_read, NULL, 0); | |
b0a6fb36 | 1328 | |
08d53aa5 AB |
1329 | if (!initial_boot_params) |
1330 | return 0; | |
b0a6fb36 | 1331 | |
08d53aa5 AB |
1332 | if (of_fdt_crc32 != crc32_be(~0, initial_boot_params, |
1333 | fdt_totalsize(initial_boot_params))) { | |
606ad42a | 1334 | pr_warn("not creating '/sys/firmware/fdt': CRC check failed\n"); |
08d53aa5 AB |
1335 | return 0; |
1336 | } | |
1337 | of_fdt_raw_attr.size = fdt_totalsize(initial_boot_params); | |
1338 | return sysfs_create_bin_file(firmware_kobj, &of_fdt_raw_attr); | |
b0a6fb36 | 1339 | } |
08d53aa5 | 1340 | late_initcall(of_fdt_raw_init); |
b0a6fb36 RH |
1341 | #endif |
1342 | ||
e6ce1324 | 1343 | #endif /* CONFIG_OF_EARLY_FLATTREE */ |