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af6074fc | 1 | // SPDX-License-Identifier: GPL-2.0 |
e169cfbe GL |
2 | /* |
3 | * Functions for working with the Flattened Device Tree data format | |
4 | * | |
5 | * Copyright 2009 Benjamin Herrenschmidt, IBM Corp | |
6 | * benh@kernel.crashing.org | |
e169cfbe GL |
7 | */ |
8 | ||
bd0096d7 | 9 | #define pr_fmt(fmt) "OF: fdt: " fmt |
606ad42a | 10 | |
08d53aa5 | 11 | #include <linux/crc32.h> |
41f88009 | 12 | #include <linux/kernel.h> |
f7b3a835 | 13 | #include <linux/initrd.h> |
a1727da5 | 14 | #include <linux/memblock.h> |
f8062386 | 15 | #include <linux/mutex.h> |
e169cfbe GL |
16 | #include <linux/of.h> |
17 | #include <linux/of_fdt.h> | |
3f0c8206 | 18 | #include <linux/of_reserved_mem.h> |
e8d9d1f5 | 19 | #include <linux/sizes.h> |
4ef7b373 JK |
20 | #include <linux/string.h> |
21 | #include <linux/errno.h> | |
fe140423 | 22 | #include <linux/slab.h> |
e6a6928c | 23 | #include <linux/libfdt.h> |
b0a6fb36 | 24 | #include <linux/debugfs.h> |
fb11ffe7 | 25 | #include <linux/serial_core.h> |
08d53aa5 | 26 | #include <linux/sysfs.h> |
51975db0 | 27 | |
c89810ac | 28 | #include <asm/setup.h> /* for COMMAND_LINE_SIZE */ |
4ef7b373 JK |
29 | #include <asm/page.h> |
30 | ||
81d0848f FR |
31 | #include "of_private.h" |
32 | ||
704033ce LA |
33 | /* |
34 | * of_fdt_limit_memory - limit the number of regions in the /memory node | |
35 | * @limit: maximum entries | |
36 | * | |
37 | * Adjust the flattened device tree to have at most 'limit' number of | |
38 | * memory entries in the /memory node. This function may be called | |
39 | * any time after initial_boot_param is set. | |
40 | */ | |
41 | void of_fdt_limit_memory(int limit) | |
42 | { | |
43 | int memory; | |
44 | int len; | |
45 | const void *val; | |
46 | int nr_address_cells = OF_ROOT_NODE_ADDR_CELLS_DEFAULT; | |
47 | int nr_size_cells = OF_ROOT_NODE_SIZE_CELLS_DEFAULT; | |
17a70355 RH |
48 | const __be32 *addr_prop; |
49 | const __be32 *size_prop; | |
704033ce LA |
50 | int root_offset; |
51 | int cell_size; | |
52 | ||
53 | root_offset = fdt_path_offset(initial_boot_params, "/"); | |
54 | if (root_offset < 0) | |
55 | return; | |
56 | ||
57 | addr_prop = fdt_getprop(initial_boot_params, root_offset, | |
58 | "#address-cells", NULL); | |
59 | if (addr_prop) | |
60 | nr_address_cells = fdt32_to_cpu(*addr_prop); | |
61 | ||
62 | size_prop = fdt_getprop(initial_boot_params, root_offset, | |
63 | "#size-cells", NULL); | |
64 | if (size_prop) | |
65 | nr_size_cells = fdt32_to_cpu(*size_prop); | |
66 | ||
67 | cell_size = sizeof(uint32_t)*(nr_address_cells + nr_size_cells); | |
68 | ||
69 | memory = fdt_path_offset(initial_boot_params, "/memory"); | |
70 | if (memory > 0) { | |
71 | val = fdt_getprop(initial_boot_params, memory, "reg", &len); | |
72 | if (len > limit*cell_size) { | |
73 | len = limit*cell_size; | |
74 | pr_debug("Limiting number of entries to %d\n", limit); | |
75 | fdt_setprop(initial_boot_params, memory, "reg", val, | |
76 | len); | |
77 | } | |
78 | } | |
79 | } | |
80 | ||
9706a36e SN |
81 | /** |
82 | * of_fdt_is_compatible - Return true if given node from the given blob has | |
83 | * compat in its compatible list | |
84 | * @blob: A device tree blob | |
85 | * @node: node to test | |
86 | * @compat: compatible string to compare with compatible list. | |
a4f740cf GL |
87 | * |
88 | * On match, returns a non-zero value with smaller values returned for more | |
89 | * specific compatible values. | |
9706a36e | 90 | */ |
92af0899 | 91 | static int of_fdt_is_compatible(const void *blob, |
9706a36e SN |
92 | unsigned long node, const char *compat) |
93 | { | |
94 | const char *cp; | |
9d0c4dfe RH |
95 | int cplen; |
96 | unsigned long l, score = 0; | |
9706a36e | 97 | |
e6a6928c | 98 | cp = fdt_getprop(blob, node, "compatible", &cplen); |
9706a36e SN |
99 | if (cp == NULL) |
100 | return 0; | |
101 | while (cplen > 0) { | |
a4f740cf | 102 | score++; |
9706a36e | 103 | if (of_compat_cmp(cp, compat, strlen(compat)) == 0) |
a4f740cf | 104 | return score; |
9706a36e SN |
105 | l = strlen(cp) + 1; |
106 | cp += l; | |
107 | cplen -= l; | |
108 | } | |
109 | ||
110 | return 0; | |
111 | } | |
112 | ||
cc783786 KC |
113 | /** |
114 | * of_fdt_is_big_endian - Return true if given node needs BE MMIO accesses | |
115 | * @blob: A device tree blob | |
116 | * @node: node to test | |
117 | * | |
118 | * Returns true if the node has a "big-endian" property, or if the kernel | |
119 | * was compiled for BE *and* the node has a "native-endian" property. | |
120 | * Returns false otherwise. | |
121 | */ | |
122 | bool of_fdt_is_big_endian(const void *blob, unsigned long node) | |
123 | { | |
124 | if (fdt_getprop(blob, node, "big-endian", NULL)) | |
125 | return true; | |
126 | if (IS_ENABLED(CONFIG_CPU_BIG_ENDIAN) && | |
127 | fdt_getprop(blob, node, "native-endian", NULL)) | |
128 | return true; | |
129 | return false; | |
130 | } | |
131 | ||
ecc8a96e RH |
132 | static bool of_fdt_device_is_available(const void *blob, unsigned long node) |
133 | { | |
134 | const char *status = fdt_getprop(blob, node, "status", NULL); | |
135 | ||
136 | if (!status) | |
137 | return true; | |
138 | ||
139 | if (!strcmp(status, "ok") || !strcmp(status, "okay")) | |
140 | return true; | |
141 | ||
142 | return false; | |
143 | } | |
144 | ||
a4f740cf GL |
145 | /** |
146 | * of_fdt_match - Return true if node matches a list of compatible values | |
147 | */ | |
c972de14 | 148 | int of_fdt_match(const void *blob, unsigned long node, |
7b482c83 | 149 | const char *const *compat) |
a4f740cf GL |
150 | { |
151 | unsigned int tmp, score = 0; | |
152 | ||
153 | if (!compat) | |
154 | return 0; | |
155 | ||
156 | while (*compat) { | |
157 | tmp = of_fdt_is_compatible(blob, node, *compat); | |
158 | if (tmp && (score == 0 || (tmp < score))) | |
159 | score = tmp; | |
160 | compat++; | |
161 | } | |
162 | ||
163 | return score; | |
164 | } | |
165 | ||
44856819 | 166 | static void *unflatten_dt_alloc(void **mem, unsigned long size, |
bbd33931 GL |
167 | unsigned long align) |
168 | { | |
169 | void *res; | |
170 | ||
44856819 GL |
171 | *mem = PTR_ALIGN(*mem, align); |
172 | res = *mem; | |
bbd33931 GL |
173 | *mem += size; |
174 | ||
175 | return res; | |
176 | } | |
177 | ||
dfbd4c6e GS |
178 | static void populate_properties(const void *blob, |
179 | int offset, | |
180 | void **mem, | |
181 | struct device_node *np, | |
182 | const char *nodename, | |
5063e25a | 183 | bool dryrun) |
bbd33931 | 184 | { |
dfbd4c6e GS |
185 | struct property *pp, **pprev = NULL; |
186 | int cur; | |
187 | bool has_name = false; | |
188 | ||
189 | pprev = &np->properties; | |
190 | for (cur = fdt_first_property_offset(blob, offset); | |
191 | cur >= 0; | |
192 | cur = fdt_next_property_offset(blob, cur)) { | |
193 | const __be32 *val; | |
194 | const char *pname; | |
195 | u32 sz; | |
196 | ||
197 | val = fdt_getprop_by_offset(blob, cur, &pname, &sz); | |
198 | if (!val) { | |
606ad42a | 199 | pr_warn("Cannot locate property at 0x%x\n", cur); |
dfbd4c6e GS |
200 | continue; |
201 | } | |
202 | ||
203 | if (!pname) { | |
606ad42a | 204 | pr_warn("Cannot find property name at 0x%x\n", cur); |
dfbd4c6e GS |
205 | continue; |
206 | } | |
207 | ||
208 | if (!strcmp(pname, "name")) | |
209 | has_name = true; | |
210 | ||
211 | pp = unflatten_dt_alloc(mem, sizeof(struct property), | |
212 | __alignof__(struct property)); | |
213 | if (dryrun) | |
214 | continue; | |
215 | ||
216 | /* We accept flattened tree phandles either in | |
217 | * ePAPR-style "phandle" properties, or the | |
218 | * legacy "linux,phandle" properties. If both | |
219 | * appear and have different values, things | |
220 | * will get weird. Don't do that. | |
221 | */ | |
222 | if (!strcmp(pname, "phandle") || | |
223 | !strcmp(pname, "linux,phandle")) { | |
224 | if (!np->phandle) | |
225 | np->phandle = be32_to_cpup(val); | |
226 | } | |
227 | ||
228 | /* And we process the "ibm,phandle" property | |
229 | * used in pSeries dynamic device tree | |
230 | * stuff | |
231 | */ | |
232 | if (!strcmp(pname, "ibm,phandle")) | |
233 | np->phandle = be32_to_cpup(val); | |
234 | ||
235 | pp->name = (char *)pname; | |
236 | pp->length = sz; | |
237 | pp->value = (__be32 *)val; | |
238 | *pprev = pp; | |
239 | pprev = &pp->next; | |
240 | } | |
241 | ||
242 | /* With version 0x10 we may not have the name property, | |
243 | * recreate it here from the unit name if absent | |
244 | */ | |
245 | if (!has_name) { | |
246 | const char *p = nodename, *ps = p, *pa = NULL; | |
247 | int len; | |
248 | ||
249 | while (*p) { | |
250 | if ((*p) == '@') | |
251 | pa = p; | |
252 | else if ((*p) == '/') | |
253 | ps = p + 1; | |
254 | p++; | |
255 | } | |
256 | ||
257 | if (pa < ps) | |
258 | pa = p; | |
259 | len = (pa - ps) + 1; | |
260 | pp = unflatten_dt_alloc(mem, sizeof(struct property) + len, | |
261 | __alignof__(struct property)); | |
262 | if (!dryrun) { | |
263 | pp->name = "name"; | |
264 | pp->length = len; | |
265 | pp->value = pp + 1; | |
266 | *pprev = pp; | |
267 | pprev = &pp->next; | |
268 | memcpy(pp->value, ps, len - 1); | |
269 | ((char *)pp->value)[len - 1] = 0; | |
270 | pr_debug("fixed up name for %s -> %s\n", | |
271 | nodename, (char *)pp->value); | |
272 | } | |
273 | } | |
274 | ||
275 | if (!dryrun) | |
276 | *pprev = NULL; | |
277 | } | |
278 | ||
a7e4cfb0 RH |
279 | static bool populate_node(const void *blob, |
280 | int offset, | |
281 | void **mem, | |
282 | struct device_node *dad, | |
283 | struct device_node **pnp, | |
284 | bool dryrun) | |
dfbd4c6e | 285 | { |
bbd33931 | 286 | struct device_node *np; |
e6a6928c | 287 | const char *pathp; |
bbd33931 | 288 | unsigned int l, allocl; |
bbd33931 | 289 | |
dfbd4c6e GS |
290 | pathp = fdt_get_name(blob, offset, &l); |
291 | if (!pathp) { | |
292 | *pnp = NULL; | |
a7e4cfb0 | 293 | return false; |
dfbd4c6e | 294 | } |
e6a6928c | 295 | |
05f4647b | 296 | allocl = ++l; |
bbd33931 | 297 | |
dfbd4c6e | 298 | np = unflatten_dt_alloc(mem, sizeof(struct device_node) + allocl, |
bbd33931 | 299 | __alignof__(struct device_node)); |
5063e25a | 300 | if (!dryrun) { |
c22618a1 | 301 | char *fn; |
0829f6d1 | 302 | of_node_init(np); |
c22618a1 | 303 | np->full_name = fn = ((char *)np) + sizeof(*np); |
a7e4cfb0 | 304 | |
c22618a1 GL |
305 | memcpy(fn, pathp, l); |
306 | ||
bbd33931 GL |
307 | if (dad != NULL) { |
308 | np->parent = dad; | |
70161ff3 GL |
309 | np->sibling = dad->child; |
310 | dad->child = np; | |
bbd33931 | 311 | } |
bbd33931 | 312 | } |
e6a6928c | 313 | |
dfbd4c6e | 314 | populate_properties(blob, offset, mem, np, pathp, dryrun); |
5063e25a | 315 | if (!dryrun) { |
bbd33931 GL |
316 | np->name = of_get_property(np, "name", NULL); |
317 | np->type = of_get_property(np, "device_type", NULL); | |
318 | ||
319 | if (!np->name) | |
320 | np->name = "<NULL>"; | |
321 | if (!np->type) | |
322 | np->type = "<NULL>"; | |
323 | } | |
e6a6928c | 324 | |
dfbd4c6e | 325 | *pnp = np; |
a7e4cfb0 | 326 | return true; |
dfbd4c6e GS |
327 | } |
328 | ||
50800082 GS |
329 | static void reverse_nodes(struct device_node *parent) |
330 | { | |
331 | struct device_node *child, *next; | |
332 | ||
333 | /* In-depth first */ | |
334 | child = parent->child; | |
335 | while (child) { | |
336 | reverse_nodes(child); | |
337 | ||
338 | child = child->sibling; | |
339 | } | |
340 | ||
341 | /* Reverse the nodes in the child list */ | |
342 | child = parent->child; | |
343 | parent->child = NULL; | |
344 | while (child) { | |
345 | next = child->sibling; | |
346 | ||
347 | child->sibling = parent->child; | |
348 | parent->child = child; | |
349 | child = next; | |
350 | } | |
351 | } | |
352 | ||
dfbd4c6e | 353 | /** |
947c82cb | 354 | * unflatten_dt_nodes - Alloc and populate a device_node from the flat tree |
dfbd4c6e GS |
355 | * @blob: The parent device tree blob |
356 | * @mem: Memory chunk to use for allocating device nodes and properties | |
dfbd4c6e GS |
357 | * @dad: Parent struct device_node |
358 | * @nodepp: The device_node tree created by the call | |
50800082 GS |
359 | * |
360 | * It returns the size of unflattened device tree or error code | |
dfbd4c6e | 361 | */ |
947c82cb GS |
362 | static int unflatten_dt_nodes(const void *blob, |
363 | void *mem, | |
364 | struct device_node *dad, | |
365 | struct device_node **nodepp) | |
dfbd4c6e | 366 | { |
50800082 | 367 | struct device_node *root; |
8c237cd0 | 368 | int offset = 0, depth = 0, initial_depth = 0; |
50800082 | 369 | #define FDT_MAX_DEPTH 64 |
50800082 GS |
370 | struct device_node *nps[FDT_MAX_DEPTH]; |
371 | void *base = mem; | |
372 | bool dryrun = !base; | |
dfbd4c6e | 373 | |
50800082 GS |
374 | if (nodepp) |
375 | *nodepp = NULL; | |
376 | ||
8c237cd0 GS |
377 | /* |
378 | * We're unflattening device sub-tree if @dad is valid. There are | |
379 | * possibly multiple nodes in the first level of depth. We need | |
380 | * set @depth to 1 to make fdt_next_node() happy as it bails | |
381 | * immediately when negative @depth is found. Otherwise, the device | |
382 | * nodes except the first one won't be unflattened successfully. | |
383 | */ | |
384 | if (dad) | |
385 | depth = initial_depth = 1; | |
386 | ||
50800082 | 387 | root = dad; |
78c44d91 | 388 | nps[depth] = dad; |
8c237cd0 | 389 | |
50800082 | 390 | for (offset = 0; |
8c237cd0 | 391 | offset >= 0 && depth >= initial_depth; |
50800082 GS |
392 | offset = fdt_next_node(blob, offset, &depth)) { |
393 | if (WARN_ON_ONCE(depth >= FDT_MAX_DEPTH)) | |
394 | continue; | |
dfbd4c6e | 395 | |
77ea8a68 RH |
396 | if (!IS_ENABLED(CONFIG_OF_KOBJ) && |
397 | !of_fdt_device_is_available(blob, offset)) | |
398 | continue; | |
399 | ||
a7e4cfb0 RH |
400 | if (!populate_node(blob, offset, &mem, nps[depth], |
401 | &nps[depth+1], dryrun)) | |
50800082 GS |
402 | return mem - base; |
403 | ||
404 | if (!dryrun && nodepp && !*nodepp) | |
78c44d91 | 405 | *nodepp = nps[depth+1]; |
50800082 | 406 | if (!dryrun && !root) |
78c44d91 | 407 | root = nps[depth+1]; |
50800082 | 408 | } |
e6a6928c | 409 | |
50800082 | 410 | if (offset < 0 && offset != -FDT_ERR_NOTFOUND) { |
606ad42a | 411 | pr_err("Error %d processing FDT\n", offset); |
50800082 GS |
412 | return -EINVAL; |
413 | } | |
e6a6928c | 414 | |
70161ff3 GL |
415 | /* |
416 | * Reverse the child list. Some drivers assumes node order matches .dts | |
417 | * node order | |
418 | */ | |
50800082 GS |
419 | if (!dryrun) |
420 | reverse_nodes(root); | |
e6a6928c | 421 | |
50800082 | 422 | return mem - base; |
bbd33931 | 423 | } |
41f88009 | 424 | |
fe140423 SN |
425 | /** |
426 | * __unflatten_device_tree - create tree of device_nodes from flat blob | |
427 | * | |
428 | * unflattens a device-tree, creating the | |
429 | * tree of struct device_node. It also fills the "name" and "type" | |
430 | * pointers of the nodes so the normal device-tree walking functions | |
431 | * can be used. | |
432 | * @blob: The blob to expand | |
c4263233 | 433 | * @dad: Parent device node |
fe140423 SN |
434 | * @mynodes: The device_node tree created by the call |
435 | * @dt_alloc: An allocator that provides a virtual address to memory | |
436 | * for the resulting tree | |
f5d2da67 | 437 | * @detached: if true set OF_DETACHED on @mynodes |
83262418 GS |
438 | * |
439 | * Returns NULL on failure or the memory chunk containing the unflattened | |
440 | * device tree on success. | |
fe140423 | 441 | */ |
81d0848f FR |
442 | void *__unflatten_device_tree(const void *blob, |
443 | struct device_node *dad, | |
444 | struct device_node **mynodes, | |
445 | void *(*dt_alloc)(u64 size, u64 align), | |
446 | bool detached) | |
fe140423 | 447 | { |
50800082 | 448 | int size; |
e6a6928c | 449 | void *mem; |
fe140423 SN |
450 | |
451 | pr_debug(" -> unflatten_device_tree()\n"); | |
452 | ||
453 | if (!blob) { | |
454 | pr_debug("No device tree pointer\n"); | |
83262418 | 455 | return NULL; |
fe140423 SN |
456 | } |
457 | ||
458 | pr_debug("Unflattening device tree:\n"); | |
c972de14 RH |
459 | pr_debug("magic: %08x\n", fdt_magic(blob)); |
460 | pr_debug("size: %08x\n", fdt_totalsize(blob)); | |
461 | pr_debug("version: %08x\n", fdt_version(blob)); | |
fe140423 | 462 | |
c972de14 | 463 | if (fdt_check_header(blob)) { |
fe140423 | 464 | pr_err("Invalid device tree blob header\n"); |
83262418 | 465 | return NULL; |
fe140423 SN |
466 | } |
467 | ||
468 | /* First pass, scan for size */ | |
c4263233 | 469 | size = unflatten_dt_nodes(blob, NULL, dad, NULL); |
50800082 | 470 | if (size < 0) |
83262418 | 471 | return NULL; |
fe140423 | 472 | |
50800082 GS |
473 | size = ALIGN(size, 4); |
474 | pr_debug(" size is %d, allocating...\n", size); | |
fe140423 SN |
475 | |
476 | /* Allocate memory for the expanded device tree */ | |
44856819 | 477 | mem = dt_alloc(size + 4, __alignof__(struct device_node)); |
49e67dd1 JH |
478 | if (!mem) |
479 | return NULL; | |
480 | ||
44856819 | 481 | memset(mem, 0, size); |
fe140423 | 482 | |
44856819 | 483 | *(__be32 *)(mem + size) = cpu_to_be32(0xdeadbeef); |
9e401275 | 484 | |
44856819 | 485 | pr_debug(" unflattening %p...\n", mem); |
fe140423 SN |
486 | |
487 | /* Second pass, do actual unflattening */ | |
c4263233 | 488 | unflatten_dt_nodes(blob, mem, dad, mynodes); |
44856819 | 489 | if (be32_to_cpup(mem + size) != 0xdeadbeef) |
fe140423 | 490 | pr_warning("End of tree marker overwritten: %08x\n", |
44856819 | 491 | be32_to_cpup(mem + size)); |
fe140423 | 492 | |
89c67752 | 493 | if (detached && mynodes) { |
1d1bde55 MS |
494 | of_node_set_flag(*mynodes, OF_DETACHED); |
495 | pr_debug("unflattened tree is detached\n"); | |
496 | } | |
497 | ||
fe140423 | 498 | pr_debug(" <- unflatten_device_tree()\n"); |
83262418 | 499 | return mem; |
fe140423 SN |
500 | } |
501 | ||
502 | static void *kernel_tree_alloc(u64 size, u64 align) | |
503 | { | |
504 | return kzalloc(size, GFP_KERNEL); | |
505 | } | |
506 | ||
f8062386 GR |
507 | static DEFINE_MUTEX(of_fdt_unflatten_mutex); |
508 | ||
fe140423 SN |
509 | /** |
510 | * of_fdt_unflatten_tree - create tree of device_nodes from flat blob | |
c4263233 GS |
511 | * @blob: Flat device tree blob |
512 | * @dad: Parent device node | |
513 | * @mynodes: The device tree created by the call | |
fe140423 SN |
514 | * |
515 | * unflattens the device-tree passed by the firmware, creating the | |
516 | * tree of struct device_node. It also fills the "name" and "type" | |
517 | * pointers of the nodes so the normal device-tree walking functions | |
518 | * can be used. | |
83262418 GS |
519 | * |
520 | * Returns NULL on failure or the memory chunk containing the unflattened | |
521 | * device tree on success. | |
fe140423 | 522 | */ |
83262418 GS |
523 | void *of_fdt_unflatten_tree(const unsigned long *blob, |
524 | struct device_node *dad, | |
525 | struct device_node **mynodes) | |
fe140423 | 526 | { |
83262418 GS |
527 | void *mem; |
528 | ||
f8062386 | 529 | mutex_lock(&of_fdt_unflatten_mutex); |
1d1bde55 MS |
530 | mem = __unflatten_device_tree(blob, dad, mynodes, &kernel_tree_alloc, |
531 | true); | |
f8062386 | 532 | mutex_unlock(&of_fdt_unflatten_mutex); |
83262418 GS |
533 | |
534 | return mem; | |
fe140423 SN |
535 | } |
536 | EXPORT_SYMBOL_GPL(of_fdt_unflatten_tree); | |
537 | ||
57d00ecf SN |
538 | /* Everything below here references initial_boot_params directly. */ |
539 | int __initdata dt_root_addr_cells; | |
540 | int __initdata dt_root_size_cells; | |
541 | ||
1daa0c4c | 542 | void *initial_boot_params; |
57d00ecf SN |
543 | |
544 | #ifdef CONFIG_OF_EARLY_FLATTREE | |
545 | ||
08d53aa5 AB |
546 | static u32 of_fdt_crc32; |
547 | ||
e8d9d1f5 MS |
548 | /** |
549 | * res_mem_reserve_reg() - reserve all memory described in 'reg' property | |
550 | */ | |
551 | static int __init __reserved_mem_reserve_reg(unsigned long node, | |
552 | const char *uname) | |
553 | { | |
554 | int t_len = (dt_root_addr_cells + dt_root_size_cells) * sizeof(__be32); | |
555 | phys_addr_t base, size; | |
9d0c4dfe RH |
556 | int len; |
557 | const __be32 *prop; | |
3f0c8206 | 558 | int nomap, first = 1; |
e8d9d1f5 MS |
559 | |
560 | prop = of_get_flat_dt_prop(node, "reg", &len); | |
561 | if (!prop) | |
562 | return -ENOENT; | |
563 | ||
564 | if (len && len % t_len != 0) { | |
565 | pr_err("Reserved memory: invalid reg property in '%s', skipping node.\n", | |
566 | uname); | |
567 | return -EINVAL; | |
568 | } | |
569 | ||
570 | nomap = of_get_flat_dt_prop(node, "no-map", NULL) != NULL; | |
571 | ||
572 | while (len >= t_len) { | |
573 | base = dt_mem_next_cell(dt_root_addr_cells, &prop); | |
574 | size = dt_mem_next_cell(dt_root_size_cells, &prop); | |
575 | ||
b5f2a8c0 | 576 | if (size && |
e8d9d1f5 MS |
577 | early_init_dt_reserve_memory_arch(base, size, nomap) == 0) |
578 | pr_debug("Reserved memory: reserved region for node '%s': base %pa, size %ld MiB\n", | |
579 | uname, &base, (unsigned long)size / SZ_1M); | |
580 | else | |
581 | pr_info("Reserved memory: failed to reserve memory for node '%s': base %pa, size %ld MiB\n", | |
582 | uname, &base, (unsigned long)size / SZ_1M); | |
583 | ||
584 | len -= t_len; | |
3f0c8206 MS |
585 | if (first) { |
586 | fdt_reserved_mem_save_node(node, uname, base, size); | |
587 | first = 0; | |
588 | } | |
e8d9d1f5 MS |
589 | } |
590 | return 0; | |
591 | } | |
592 | ||
593 | /** | |
594 | * __reserved_mem_check_root() - check if #size-cells, #address-cells provided | |
595 | * in /reserved-memory matches the values supported by the current implementation, | |
596 | * also check if ranges property has been provided | |
597 | */ | |
5b624118 | 598 | static int __init __reserved_mem_check_root(unsigned long node) |
e8d9d1f5 | 599 | { |
9d0c4dfe | 600 | const __be32 *prop; |
e8d9d1f5 MS |
601 | |
602 | prop = of_get_flat_dt_prop(node, "#size-cells", NULL); | |
603 | if (!prop || be32_to_cpup(prop) != dt_root_size_cells) | |
604 | return -EINVAL; | |
605 | ||
606 | prop = of_get_flat_dt_prop(node, "#address-cells", NULL); | |
607 | if (!prop || be32_to_cpup(prop) != dt_root_addr_cells) | |
608 | return -EINVAL; | |
609 | ||
610 | prop = of_get_flat_dt_prop(node, "ranges", NULL); | |
611 | if (!prop) | |
612 | return -EINVAL; | |
613 | return 0; | |
614 | } | |
615 | ||
616 | /** | |
617 | * fdt_scan_reserved_mem() - scan a single FDT node for reserved memory | |
618 | */ | |
619 | static int __init __fdt_scan_reserved_mem(unsigned long node, const char *uname, | |
620 | int depth, void *data) | |
621 | { | |
622 | static int found; | |
3f0c8206 | 623 | int err; |
e8d9d1f5 MS |
624 | |
625 | if (!found && depth == 1 && strcmp(uname, "reserved-memory") == 0) { | |
626 | if (__reserved_mem_check_root(node) != 0) { | |
627 | pr_err("Reserved memory: unsupported node format, ignoring\n"); | |
628 | /* break scan */ | |
629 | return 1; | |
630 | } | |
631 | found = 1; | |
632 | /* scan next node */ | |
633 | return 0; | |
634 | } else if (!found) { | |
635 | /* scan next node */ | |
636 | return 0; | |
637 | } else if (found && depth < 2) { | |
638 | /* scanning of /reserved-memory has been finished */ | |
639 | return 1; | |
640 | } | |
641 | ||
ecc8a96e | 642 | if (!of_fdt_device_is_available(initial_boot_params, node)) |
e8d9d1f5 MS |
643 | return 0; |
644 | ||
3f0c8206 MS |
645 | err = __reserved_mem_reserve_reg(node, uname); |
646 | if (err == -ENOENT && of_get_flat_dt_prop(node, "size", NULL)) | |
647 | fdt_reserved_mem_save_node(node, uname, 0, 0); | |
e8d9d1f5 MS |
648 | |
649 | /* scan next node */ | |
650 | return 0; | |
651 | } | |
652 | ||
653 | /** | |
654 | * early_init_fdt_scan_reserved_mem() - create reserved memory regions | |
655 | * | |
656 | * This function grabs memory from early allocator for device exclusive use | |
657 | * defined in device tree structures. It should be called by arch specific code | |
658 | * once the early allocator (i.e. memblock) has been fully activated. | |
659 | */ | |
660 | void __init early_init_fdt_scan_reserved_mem(void) | |
661 | { | |
d1552ce4 RH |
662 | int n; |
663 | u64 base, size; | |
664 | ||
2040b527 JC |
665 | if (!initial_boot_params) |
666 | return; | |
667 | ||
d1552ce4 RH |
668 | /* Process header /memreserve/ fields */ |
669 | for (n = 0; ; n++) { | |
670 | fdt_get_mem_rsv(initial_boot_params, n, &base, &size); | |
671 | if (!size) | |
672 | break; | |
673 | early_init_dt_reserve_memory_arch(base, size, 0); | |
674 | } | |
675 | ||
e8d9d1f5 | 676 | of_scan_flat_dt(__fdt_scan_reserved_mem, NULL); |
3f0c8206 | 677 | fdt_init_reserved_mem(); |
e8d9d1f5 MS |
678 | } |
679 | ||
24bbd929 AB |
680 | /** |
681 | * early_init_fdt_reserve_self() - reserve the memory used by the FDT blob | |
682 | */ | |
683 | void __init early_init_fdt_reserve_self(void) | |
684 | { | |
685 | if (!initial_boot_params) | |
686 | return; | |
687 | ||
688 | /* Reserve the dtb region */ | |
689 | early_init_dt_reserve_memory_arch(__pa(initial_boot_params), | |
690 | fdt_totalsize(initial_boot_params), | |
691 | 0); | |
692 | } | |
693 | ||
57d00ecf SN |
694 | /** |
695 | * of_scan_flat_dt - scan flattened tree blob and call callback on each. | |
696 | * @it: callback function | |
697 | * @data: context data pointer | |
698 | * | |
699 | * This function is used to scan the flattened device-tree, it is | |
700 | * used to extract the memory information at boot before we can | |
701 | * unflatten the tree | |
702 | */ | |
703 | int __init of_scan_flat_dt(int (*it)(unsigned long node, | |
704 | const char *uname, int depth, | |
705 | void *data), | |
706 | void *data) | |
707 | { | |
e6a6928c RH |
708 | const void *blob = initial_boot_params; |
709 | const char *pathp; | |
710 | int offset, rc = 0, depth = -1; | |
711 | ||
3ec75441 TW |
712 | if (!blob) |
713 | return 0; | |
714 | ||
715 | for (offset = fdt_next_node(blob, -1, &depth); | |
716 | offset >= 0 && depth >= 0 && !rc; | |
717 | offset = fdt_next_node(blob, offset, &depth)) { | |
e6a6928c RH |
718 | |
719 | pathp = fdt_get_name(blob, offset, NULL); | |
375da3a7 AS |
720 | if (*pathp == '/') |
721 | pathp = kbasename(pathp); | |
e6a6928c RH |
722 | rc = it(offset, pathp, depth, data); |
723 | } | |
57d00ecf SN |
724 | return rc; |
725 | } | |
726 | ||
ea47dd19 NP |
727 | /** |
728 | * of_scan_flat_dt_subnodes - scan sub-nodes of a node call callback on each. | |
729 | * @it: callback function | |
730 | * @data: context data pointer | |
731 | * | |
732 | * This function is used to scan sub-nodes of a node. | |
733 | */ | |
734 | int __init of_scan_flat_dt_subnodes(unsigned long parent, | |
735 | int (*it)(unsigned long node, | |
736 | const char *uname, | |
737 | void *data), | |
738 | void *data) | |
739 | { | |
740 | const void *blob = initial_boot_params; | |
741 | int node; | |
742 | ||
743 | fdt_for_each_subnode(node, blob, parent) { | |
744 | const char *pathp; | |
745 | int rc; | |
746 | ||
747 | pathp = fdt_get_name(blob, node, NULL); | |
748 | if (*pathp == '/') | |
749 | pathp = kbasename(pathp); | |
750 | rc = it(node, pathp, data); | |
751 | if (rc) | |
752 | return rc; | |
753 | } | |
754 | return 0; | |
755 | } | |
756 | ||
9c609868 SZ |
757 | /** |
758 | * of_get_flat_dt_subnode_by_name - get the subnode by given name | |
759 | * | |
760 | * @node: the parent node | |
761 | * @uname: the name of subnode | |
762 | * @return offset of the subnode, or -FDT_ERR_NOTFOUND if there is none | |
763 | */ | |
764 | ||
765 | int of_get_flat_dt_subnode_by_name(unsigned long node, const char *uname) | |
766 | { | |
767 | return fdt_subnode_offset(initial_boot_params, node, uname); | |
768 | } | |
769 | ||
57d00ecf SN |
770 | /** |
771 | * of_get_flat_dt_root - find the root node in the flat blob | |
772 | */ | |
773 | unsigned long __init of_get_flat_dt_root(void) | |
774 | { | |
e6a6928c | 775 | return 0; |
57d00ecf SN |
776 | } |
777 | ||
c0556d3f RH |
778 | /** |
779 | * of_get_flat_dt_size - Return the total size of the FDT | |
780 | */ | |
781 | int __init of_get_flat_dt_size(void) | |
782 | { | |
783 | return fdt_totalsize(initial_boot_params); | |
784 | } | |
785 | ||
57d00ecf SN |
786 | /** |
787 | * of_get_flat_dt_prop - Given a node in the flat blob, return the property ptr | |
788 | * | |
789 | * This function can be used within scan_flattened_dt callback to get | |
790 | * access to properties | |
791 | */ | |
9d0c4dfe RH |
792 | const void *__init of_get_flat_dt_prop(unsigned long node, const char *name, |
793 | int *size) | |
57d00ecf | 794 | { |
e6a6928c | 795 | return fdt_getprop(initial_boot_params, node, name, size); |
57d00ecf SN |
796 | } |
797 | ||
798 | /** | |
799 | * of_flat_dt_is_compatible - Return true if given node has compat in compatible list | |
800 | * @node: node to test | |
801 | * @compat: compatible string to compare with compatible list. | |
802 | */ | |
803 | int __init of_flat_dt_is_compatible(unsigned long node, const char *compat) | |
804 | { | |
805 | return of_fdt_is_compatible(initial_boot_params, node, compat); | |
806 | } | |
807 | ||
a4f740cf GL |
808 | /** |
809 | * of_flat_dt_match - Return true if node matches a list of compatible values | |
810 | */ | |
7b482c83 | 811 | int __init of_flat_dt_match(unsigned long node, const char *const *compat) |
a4f740cf GL |
812 | { |
813 | return of_fdt_match(initial_boot_params, node, compat); | |
814 | } | |
815 | ||
ea47dd19 NP |
816 | /** |
817 | * of_get_flat_dt_prop - Given a node in the flat blob, return the phandle | |
818 | */ | |
819 | uint32_t __init of_get_flat_dt_phandle(unsigned long node) | |
820 | { | |
821 | return fdt_get_phandle(initial_boot_params, node); | |
822 | } | |
823 | ||
57d74bcf MS |
824 | struct fdt_scan_status { |
825 | const char *name; | |
826 | int namelen; | |
827 | int depth; | |
828 | int found; | |
829 | int (*iterator)(unsigned long node, const char *uname, int depth, void *data); | |
830 | void *data; | |
831 | }; | |
832 | ||
6a903a25 RH |
833 | const char * __init of_flat_dt_get_machine_name(void) |
834 | { | |
835 | const char *name; | |
836 | unsigned long dt_root = of_get_flat_dt_root(); | |
837 | ||
838 | name = of_get_flat_dt_prop(dt_root, "model", NULL); | |
839 | if (!name) | |
840 | name = of_get_flat_dt_prop(dt_root, "compatible", NULL); | |
841 | return name; | |
842 | } | |
843 | ||
844 | /** | |
845 | * of_flat_dt_match_machine - Iterate match tables to find matching machine. | |
846 | * | |
847 | * @default_match: A machine specific ptr to return in case of no match. | |
848 | * @get_next_compat: callback function to return next compatible match table. | |
849 | * | |
850 | * Iterate through machine match tables to find the best match for the machine | |
851 | * compatible string in the FDT. | |
852 | */ | |
853 | const void * __init of_flat_dt_match_machine(const void *default_match, | |
854 | const void * (*get_next_compat)(const char * const**)) | |
855 | { | |
856 | const void *data = NULL; | |
857 | const void *best_data = default_match; | |
858 | const char *const *compat; | |
859 | unsigned long dt_root; | |
860 | unsigned int best_score = ~1, score = 0; | |
861 | ||
862 | dt_root = of_get_flat_dt_root(); | |
863 | while ((data = get_next_compat(&compat))) { | |
864 | score = of_flat_dt_match(dt_root, compat); | |
865 | if (score > 0 && score < best_score) { | |
866 | best_data = data; | |
867 | best_score = score; | |
868 | } | |
869 | } | |
870 | if (!best_data) { | |
871 | const char *prop; | |
9d0c4dfe | 872 | int size; |
6a903a25 RH |
873 | |
874 | pr_err("\n unrecognized device tree list:\n[ "); | |
875 | ||
876 | prop = of_get_flat_dt_prop(dt_root, "compatible", &size); | |
877 | if (prop) { | |
878 | while (size > 0) { | |
879 | printk("'%s' ", prop); | |
880 | size -= strlen(prop) + 1; | |
881 | prop += strlen(prop) + 1; | |
882 | } | |
883 | } | |
884 | printk("]\n\n"); | |
885 | return NULL; | |
886 | } | |
887 | ||
888 | pr_info("Machine model: %s\n", of_flat_dt_get_machine_name()); | |
889 | ||
890 | return best_data; | |
891 | } | |
892 | ||
f7b3a835 | 893 | #ifdef CONFIG_BLK_DEV_INITRD |
369bc9ab AB |
894 | #ifndef __early_init_dt_declare_initrd |
895 | static void __early_init_dt_declare_initrd(unsigned long start, | |
896 | unsigned long end) | |
897 | { | |
898 | initrd_start = (unsigned long)__va(start); | |
899 | initrd_end = (unsigned long)__va(end); | |
900 | initrd_below_start_ok = 1; | |
901 | } | |
902 | #endif | |
903 | ||
f7b3a835 GL |
904 | /** |
905 | * early_init_dt_check_for_initrd - Decode initrd location from flat tree | |
906 | * @node: reference to node containing initrd location ('chosen') | |
907 | */ | |
29eb45a9 | 908 | static void __init early_init_dt_check_for_initrd(unsigned long node) |
f7b3a835 | 909 | { |
374d5c99 | 910 | u64 start, end; |
9d0c4dfe RH |
911 | int len; |
912 | const __be32 *prop; | |
f7b3a835 GL |
913 | |
914 | pr_debug("Looking for initrd properties... "); | |
915 | ||
916 | prop = of_get_flat_dt_prop(node, "linux,initrd-start", &len); | |
1406bc2f JK |
917 | if (!prop) |
918 | return; | |
374d5c99 | 919 | start = of_read_number(prop, len/4); |
1406bc2f JK |
920 | |
921 | prop = of_get_flat_dt_prop(node, "linux,initrd-end", &len); | |
922 | if (!prop) | |
923 | return; | |
374d5c99 | 924 | end = of_read_number(prop, len/4); |
f7b3a835 | 925 | |
369bc9ab | 926 | __early_init_dt_declare_initrd(start, end); |
29eb45a9 | 927 | |
374d5c99 SS |
928 | pr_debug("initrd_start=0x%llx initrd_end=0x%llx\n", |
929 | (unsigned long long)start, (unsigned long long)end); | |
f7b3a835 GL |
930 | } |
931 | #else | |
29eb45a9 | 932 | static inline void early_init_dt_check_for_initrd(unsigned long node) |
f7b3a835 GL |
933 | { |
934 | } | |
935 | #endif /* CONFIG_BLK_DEV_INITRD */ | |
936 | ||
fb11ffe7 | 937 | #ifdef CONFIG_SERIAL_EARLYCON |
fb11ffe7 | 938 | |
d503187b | 939 | int __init early_init_dt_scan_chosen_stdout(void) |
fb11ffe7 RH |
940 | { |
941 | int offset; | |
4d118c9a | 942 | const char *p, *q, *options = NULL; |
fb11ffe7 | 943 | int l; |
2eaa7909 | 944 | const struct earlycon_id *match; |
fb11ffe7 RH |
945 | const void *fdt = initial_boot_params; |
946 | ||
947 | offset = fdt_path_offset(fdt, "/chosen"); | |
948 | if (offset < 0) | |
949 | offset = fdt_path_offset(fdt, "/chosen@0"); | |
950 | if (offset < 0) | |
951 | return -ENOENT; | |
952 | ||
953 | p = fdt_getprop(fdt, offset, "stdout-path", &l); | |
954 | if (!p) | |
955 | p = fdt_getprop(fdt, offset, "linux,stdout-path", &l); | |
956 | if (!p || !l) | |
957 | return -ENOENT; | |
958 | ||
4d118c9a PH |
959 | q = strchrnul(p, ':'); |
960 | if (*q != '\0') | |
961 | options = q + 1; | |
0fcc286f | 962 | l = q - p; |
6296ad9e | 963 | |
fb11ffe7 | 964 | /* Get the node specified by stdout-path */ |
0fcc286f PH |
965 | offset = fdt_path_offset_namelen(fdt, p, l); |
966 | if (offset < 0) { | |
967 | pr_warn("earlycon: stdout-path %.*s not found\n", l, p); | |
968 | return 0; | |
969 | } | |
fb11ffe7 | 970 | |
2eaa7909 | 971 | for (match = __earlycon_table; match < __earlycon_table_end; match++) { |
2eaa7909 PH |
972 | if (!match->compatible[0]) |
973 | continue; | |
974 | ||
975 | if (fdt_node_check_compatible(fdt, offset, match->compatible)) | |
fb11ffe7 | 976 | continue; |
fb11ffe7 | 977 | |
c90fe9c0 | 978 | of_setup_earlycon(match, offset, options); |
fb11ffe7 RH |
979 | return 0; |
980 | } | |
981 | return -ENODEV; | |
982 | } | |
fb11ffe7 RH |
983 | #endif |
984 | ||
f00abd94 GL |
985 | /** |
986 | * early_init_dt_scan_root - fetch the top level address and size cells | |
987 | */ | |
988 | int __init early_init_dt_scan_root(unsigned long node, const char *uname, | |
989 | int depth, void *data) | |
990 | { | |
9d0c4dfe | 991 | const __be32 *prop; |
f00abd94 GL |
992 | |
993 | if (depth != 0) | |
994 | return 0; | |
995 | ||
33714881 JK |
996 | dt_root_size_cells = OF_ROOT_NODE_SIZE_CELLS_DEFAULT; |
997 | dt_root_addr_cells = OF_ROOT_NODE_ADDR_CELLS_DEFAULT; | |
998 | ||
f00abd94 | 999 | prop = of_get_flat_dt_prop(node, "#size-cells", NULL); |
33714881 JK |
1000 | if (prop) |
1001 | dt_root_size_cells = be32_to_cpup(prop); | |
f00abd94 GL |
1002 | pr_debug("dt_root_size_cells = %x\n", dt_root_size_cells); |
1003 | ||
1004 | prop = of_get_flat_dt_prop(node, "#address-cells", NULL); | |
33714881 JK |
1005 | if (prop) |
1006 | dt_root_addr_cells = be32_to_cpup(prop); | |
f00abd94 GL |
1007 | pr_debug("dt_root_addr_cells = %x\n", dt_root_addr_cells); |
1008 | ||
1009 | /* break now */ | |
1010 | return 1; | |
1011 | } | |
1012 | ||
9d0c4dfe | 1013 | u64 __init dt_mem_next_cell(int s, const __be32 **cellp) |
83f7a06e | 1014 | { |
9d0c4dfe | 1015 | const __be32 *p = *cellp; |
83f7a06e GL |
1016 | |
1017 | *cellp = p + s; | |
1018 | return of_read_number(p, s); | |
1019 | } | |
1020 | ||
51975db0 | 1021 | /** |
0ef5adca | 1022 | * early_init_dt_scan_memory - Look for and parse memory nodes |
51975db0 GL |
1023 | */ |
1024 | int __init early_init_dt_scan_memory(unsigned long node, const char *uname, | |
1025 | int depth, void *data) | |
1026 | { | |
9d0c4dfe RH |
1027 | const char *type = of_get_flat_dt_prop(node, "device_type", NULL); |
1028 | const __be32 *reg, *endp; | |
1029 | int l; | |
41a9ada3 | 1030 | bool hotpluggable; |
51975db0 GL |
1031 | |
1032 | /* We are scanning "memory" nodes only */ | |
1033 | if (type == NULL) { | |
1034 | /* | |
1035 | * The longtrail doesn't have a device_type on the | |
1036 | * /memory node, so look for the node called /memory@0. | |
1037 | */ | |
b44aa25d | 1038 | if (!IS_ENABLED(CONFIG_PPC32) || depth != 1 || strcmp(uname, "memory@0") != 0) |
51975db0 GL |
1039 | return 0; |
1040 | } else if (strcmp(type, "memory") != 0) | |
1041 | return 0; | |
1042 | ||
1043 | reg = of_get_flat_dt_prop(node, "linux,usable-memory", &l); | |
1044 | if (reg == NULL) | |
1045 | reg = of_get_flat_dt_prop(node, "reg", &l); | |
1046 | if (reg == NULL) | |
1047 | return 0; | |
1048 | ||
1049 | endp = reg + (l / sizeof(__be32)); | |
41a9ada3 | 1050 | hotpluggable = of_get_flat_dt_prop(node, "hotpluggable", NULL); |
51975db0 | 1051 | |
c954b36e | 1052 | pr_debug("memory scan node %s, reg size %d,\n", uname, l); |
51975db0 GL |
1053 | |
1054 | while ((endp - reg) >= (dt_root_addr_cells + dt_root_size_cells)) { | |
1055 | u64 base, size; | |
1056 | ||
1057 | base = dt_mem_next_cell(dt_root_addr_cells, ®); | |
1058 | size = dt_mem_next_cell(dt_root_size_cells, ®); | |
1059 | ||
1060 | if (size == 0) | |
1061 | continue; | |
1062 | pr_debug(" - %llx , %llx\n", (unsigned long long)base, | |
1063 | (unsigned long long)size); | |
1064 | ||
1065 | early_init_dt_add_memory_arch(base, size); | |
41a9ada3 RA |
1066 | |
1067 | if (!hotpluggable) | |
1068 | continue; | |
1069 | ||
1070 | if (early_init_dt_mark_hotplug_memory_arch(base, size)) | |
1071 | pr_warn("failed to mark hotplug range 0x%llx - 0x%llx\n", | |
1072 | base, base + size); | |
51975db0 GL |
1073 | } |
1074 | ||
1075 | return 0; | |
1076 | } | |
1077 | ||
86e03221 GL |
1078 | int __init early_init_dt_scan_chosen(unsigned long node, const char *uname, |
1079 | int depth, void *data) | |
1080 | { | |
9d0c4dfe RH |
1081 | int l; |
1082 | const char *p; | |
86e03221 GL |
1083 | |
1084 | pr_debug("search \"chosen\", depth: %d, uname: %s\n", depth, uname); | |
1085 | ||
85f60ae4 | 1086 | if (depth != 1 || !data || |
86e03221 GL |
1087 | (strcmp(uname, "chosen") != 0 && strcmp(uname, "chosen@0") != 0)) |
1088 | return 0; | |
1089 | ||
1090 | early_init_dt_check_for_initrd(node); | |
1091 | ||
25985edc | 1092 | /* Retrieve command line */ |
86e03221 GL |
1093 | p = of_get_flat_dt_prop(node, "bootargs", &l); |
1094 | if (p != NULL && l > 0) | |
85f60ae4 | 1095 | strlcpy(data, p, min((int)l, COMMAND_LINE_SIZE)); |
86e03221 | 1096 | |
78b782cb BH |
1097 | /* |
1098 | * CONFIG_CMDLINE is meant to be a default in case nothing else | |
1099 | * managed to set the command line, unless CONFIG_CMDLINE_FORCE | |
1100 | * is set in which case we override whatever was found earlier. | |
1101 | */ | |
86e03221 | 1102 | #ifdef CONFIG_CMDLINE |
34b82026 MU |
1103 | #if defined(CONFIG_CMDLINE_EXTEND) |
1104 | strlcat(data, " ", COMMAND_LINE_SIZE); | |
1105 | strlcat(data, CONFIG_CMDLINE, COMMAND_LINE_SIZE); | |
1106 | #elif defined(CONFIG_CMDLINE_FORCE) | |
1107 | strlcpy(data, CONFIG_CMDLINE, COMMAND_LINE_SIZE); | |
1108 | #else | |
1109 | /* No arguments from boot loader, use kernel's cmdl*/ | |
78b782cb | 1110 | if (!((char *)data)[0]) |
85f60ae4 | 1111 | strlcpy(data, CONFIG_CMDLINE, COMMAND_LINE_SIZE); |
34b82026 | 1112 | #endif |
86e03221 GL |
1113 | #endif /* CONFIG_CMDLINE */ |
1114 | ||
85f60ae4 | 1115 | pr_debug("Command line is: %s\n", (char*)data); |
86e03221 GL |
1116 | |
1117 | /* break now */ | |
1118 | return 1; | |
1119 | } | |
1120 | ||
a1727da5 | 1121 | #ifdef CONFIG_HAVE_MEMBLOCK |
270522a0 AB |
1122 | #ifndef MIN_MEMBLOCK_ADDR |
1123 | #define MIN_MEMBLOCK_ADDR __pa(PAGE_OFFSET) | |
1124 | #endif | |
8eafeb48 AB |
1125 | #ifndef MAX_MEMBLOCK_ADDR |
1126 | #define MAX_MEMBLOCK_ADDR ((phys_addr_t)~0) | |
1127 | #endif | |
3069f0c0 | 1128 | |
068f6310 RH |
1129 | void __init __weak early_init_dt_add_memory_arch(u64 base, u64 size) |
1130 | { | |
270522a0 | 1131 | const u64 phys_offset = MIN_MEMBLOCK_ADDR; |
8f73d4b7 GU |
1132 | |
1133 | if (!PAGE_ALIGNED(base)) { | |
8cccffc5 AB |
1134 | if (size < PAGE_SIZE - (base & ~PAGE_MASK)) { |
1135 | pr_warn("Ignoring memory block 0x%llx - 0x%llx\n", | |
1136 | base, base + size); | |
1137 | return; | |
1138 | } | |
8f73d4b7 GU |
1139 | size -= PAGE_SIZE - (base & ~PAGE_MASK); |
1140 | base = PAGE_ALIGN(base); | |
1141 | } | |
068f6310 | 1142 | size &= PAGE_MASK; |
a67a6ed1 | 1143 | |
8eafeb48 | 1144 | if (base > MAX_MEMBLOCK_ADDR) { |
3069f0c0 LA |
1145 | pr_warning("Ignoring memory block 0x%llx - 0x%llx\n", |
1146 | base, base + size); | |
1147 | return; | |
1148 | } | |
a67a6ed1 | 1149 | |
8eafeb48 | 1150 | if (base + size - 1 > MAX_MEMBLOCK_ADDR) { |
9aacd602 | 1151 | pr_warning("Ignoring memory range 0x%llx - 0x%llx\n", |
8eafeb48 AB |
1152 | ((u64)MAX_MEMBLOCK_ADDR) + 1, base + size); |
1153 | size = MAX_MEMBLOCK_ADDR - base + 1; | |
a67a6ed1 LA |
1154 | } |
1155 | ||
068f6310 RH |
1156 | if (base + size < phys_offset) { |
1157 | pr_warning("Ignoring memory block 0x%llx - 0x%llx\n", | |
1158 | base, base + size); | |
1159 | return; | |
1160 | } | |
1161 | if (base < phys_offset) { | |
1162 | pr_warning("Ignoring memory range 0x%llx - 0x%llx\n", | |
1163 | base, phys_offset); | |
1164 | size -= phys_offset - base; | |
1165 | base = phys_offset; | |
1166 | } | |
1167 | memblock_add(base, size); | |
1168 | } | |
1169 | ||
41a9ada3 RA |
1170 | int __init __weak early_init_dt_mark_hotplug_memory_arch(u64 base, u64 size) |
1171 | { | |
1172 | return memblock_mark_hotplug(base, size); | |
1173 | } | |
1174 | ||
e8d9d1f5 MS |
1175 | int __init __weak early_init_dt_reserve_memory_arch(phys_addr_t base, |
1176 | phys_addr_t size, bool nomap) | |
1177 | { | |
e8d9d1f5 MS |
1178 | if (nomap) |
1179 | return memblock_remove(base, size); | |
1180 | return memblock_reserve(base, size); | |
1181 | } | |
1182 | ||
a1727da5 GL |
1183 | /* |
1184 | * called from unflatten_device_tree() to bootstrap devicetree itself | |
1185 | * Architectures can override this definition if memblock isn't used | |
1186 | */ | |
1187 | void * __init __weak early_init_dt_alloc_memory_arch(u64 size, u64 align) | |
1188 | { | |
1189 | return __va(memblock_alloc(size, align)); | |
1190 | } | |
e8d9d1f5 | 1191 | #else |
aefc7ec2 RH |
1192 | void __init __weak early_init_dt_add_memory_arch(u64 base, u64 size) |
1193 | { | |
1194 | WARN_ON(1); | |
1195 | } | |
1196 | ||
41a9ada3 RA |
1197 | int __init __weak early_init_dt_mark_hotplug_memory_arch(u64 base, u64 size) |
1198 | { | |
1199 | return -ENOSYS; | |
1200 | } | |
1201 | ||
e8d9d1f5 MS |
1202 | int __init __weak early_init_dt_reserve_memory_arch(phys_addr_t base, |
1203 | phys_addr_t size, bool nomap) | |
1204 | { | |
78bb2abe | 1205 | pr_err("Reserved memory not supported, ignoring range %pa - %pa%s\n", |
1d1a661d | 1206 | &base, &size, nomap ? " (nomap)" : ""); |
e8d9d1f5 MS |
1207 | return -ENOSYS; |
1208 | } | |
aefc7ec2 RH |
1209 | |
1210 | void * __init __weak early_init_dt_alloc_memory_arch(u64 size, u64 align) | |
1211 | { | |
1212 | WARN_ON(1); | |
1213 | return NULL; | |
1214 | } | |
a1727da5 GL |
1215 | #endif |
1216 | ||
4972a74b | 1217 | bool __init early_init_dt_verify(void *params) |
0288ffcb RH |
1218 | { |
1219 | if (!params) | |
1220 | return false; | |
1221 | ||
0288ffcb | 1222 | /* check device tree validity */ |
50ba08f3 | 1223 | if (fdt_check_header(params)) |
0288ffcb | 1224 | return false; |
0288ffcb | 1225 | |
50ba08f3 BH |
1226 | /* Setup flat device-tree pointer */ |
1227 | initial_boot_params = params; | |
08d53aa5 AB |
1228 | of_fdt_crc32 = crc32_be(~0, initial_boot_params, |
1229 | fdt_totalsize(initial_boot_params)); | |
4972a74b LA |
1230 | return true; |
1231 | } | |
1232 | ||
1233 | ||
1234 | void __init early_init_dt_scan_nodes(void) | |
1235 | { | |
0288ffcb RH |
1236 | /* Retrieve various information from the /chosen node */ |
1237 | of_scan_flat_dt(early_init_dt_scan_chosen, boot_command_line); | |
1238 | ||
1239 | /* Initialize {size,address}-cells info */ | |
1240 | of_scan_flat_dt(early_init_dt_scan_root, NULL); | |
1241 | ||
1242 | /* Setup memory, calling early_init_dt_add_memory_arch */ | |
1243 | of_scan_flat_dt(early_init_dt_scan_memory, NULL); | |
4972a74b LA |
1244 | } |
1245 | ||
1246 | bool __init early_init_dt_scan(void *params) | |
1247 | { | |
1248 | bool status; | |
1249 | ||
1250 | status = early_init_dt_verify(params); | |
1251 | if (!status) | |
1252 | return false; | |
0288ffcb | 1253 | |
4972a74b | 1254 | early_init_dt_scan_nodes(); |
0288ffcb RH |
1255 | return true; |
1256 | } | |
1257 | ||
41f88009 GL |
1258 | /** |
1259 | * unflatten_device_tree - create tree of device_nodes from flat blob | |
1260 | * | |
1261 | * unflattens the device-tree passed by the firmware, creating the | |
1262 | * tree of struct device_node. It also fills the "name" and "type" | |
1263 | * pointers of the nodes so the normal device-tree walking functions | |
1264 | * can be used. | |
1265 | */ | |
1266 | void __init unflatten_device_tree(void) | |
1267 | { | |
c4263233 | 1268 | __unflatten_device_tree(initial_boot_params, NULL, &of_root, |
1d1bde55 | 1269 | early_init_dt_alloc_memory_arch, false); |
41f88009 | 1270 | |
4c7d6361 | 1271 | /* Get pointer to "/chosen" and "/aliases" nodes for use everywhere */ |
611cad72 | 1272 | of_alias_scan(early_init_dt_alloc_memory_arch); |
81d0848f FR |
1273 | |
1274 | unittest_unflatten_overlay_base(); | |
41f88009 | 1275 | } |
e6ce1324 | 1276 | |
a8bf7527 RH |
1277 | /** |
1278 | * unflatten_and_copy_device_tree - copy and create tree of device_nodes from flat blob | |
1279 | * | |
1280 | * Copies and unflattens the device-tree passed by the firmware, creating the | |
1281 | * tree of struct device_node. It also fills the "name" and "type" | |
1282 | * pointers of the nodes so the normal device-tree walking functions | |
1283 | * can be used. This should only be used when the FDT memory has not been | |
1284 | * reserved such is the case when the FDT is built-in to the kernel init | |
1285 | * section. If the FDT memory is reserved already then unflatten_device_tree | |
1286 | * should be used instead. | |
1287 | */ | |
1288 | void __init unflatten_and_copy_device_tree(void) | |
1289 | { | |
6f041e99 JH |
1290 | int size; |
1291 | void *dt; | |
1292 | ||
1293 | if (!initial_boot_params) { | |
1294 | pr_warn("No valid device tree found, continuing without\n"); | |
1295 | return; | |
1296 | } | |
1297 | ||
c972de14 | 1298 | size = fdt_totalsize(initial_boot_params); |
6f041e99 | 1299 | dt = early_init_dt_alloc_memory_arch(size, |
c972de14 | 1300 | roundup_pow_of_two(FDT_V17_SIZE)); |
a8bf7527 RH |
1301 | |
1302 | if (dt) { | |
1303 | memcpy(dt, initial_boot_params, size); | |
1304 | initial_boot_params = dt; | |
1305 | } | |
1306 | unflatten_device_tree(); | |
1307 | } | |
1308 | ||
08d53aa5 AB |
1309 | #ifdef CONFIG_SYSFS |
1310 | static ssize_t of_fdt_raw_read(struct file *filp, struct kobject *kobj, | |
1311 | struct bin_attribute *bin_attr, | |
1312 | char *buf, loff_t off, size_t count) | |
b0a6fb36 | 1313 | { |
08d53aa5 AB |
1314 | memcpy(buf, initial_boot_params + off, count); |
1315 | return count; | |
1316 | } | |
b0a6fb36 | 1317 | |
08d53aa5 AB |
1318 | static int __init of_fdt_raw_init(void) |
1319 | { | |
1320 | static struct bin_attribute of_fdt_raw_attr = | |
1321 | __BIN_ATTR(fdt, S_IRUSR, of_fdt_raw_read, NULL, 0); | |
b0a6fb36 | 1322 | |
08d53aa5 AB |
1323 | if (!initial_boot_params) |
1324 | return 0; | |
b0a6fb36 | 1325 | |
08d53aa5 AB |
1326 | if (of_fdt_crc32 != crc32_be(~0, initial_boot_params, |
1327 | fdt_totalsize(initial_boot_params))) { | |
606ad42a | 1328 | pr_warn("not creating '/sys/firmware/fdt': CRC check failed\n"); |
08d53aa5 AB |
1329 | return 0; |
1330 | } | |
1331 | of_fdt_raw_attr.size = fdt_totalsize(initial_boot_params); | |
1332 | return sysfs_create_bin_file(firmware_kobj, &of_fdt_raw_attr); | |
b0a6fb36 | 1333 | } |
08d53aa5 | 1334 | late_initcall(of_fdt_raw_init); |
b0a6fb36 RH |
1335 | #endif |
1336 | ||
e6ce1324 | 1337 | #endif /* CONFIG_OF_EARLY_FLATTREE */ |