Commit | Line | Data |
---|---|---|
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> |
428826f5 | 27 | #include <linux/random.h> |
51975db0 | 28 | |
c89810ac | 29 | #include <asm/setup.h> /* for COMMAND_LINE_SIZE */ |
4ef7b373 JK |
30 | #include <asm/page.h> |
31 | ||
81d0848f FR |
32 | #include "of_private.h" |
33 | ||
704033ce LA |
34 | /* |
35 | * of_fdt_limit_memory - limit the number of regions in the /memory node | |
36 | * @limit: maximum entries | |
37 | * | |
38 | * Adjust the flattened device tree to have at most 'limit' number of | |
39 | * memory entries in the /memory node. This function may be called | |
40 | * any time after initial_boot_param is set. | |
41 | */ | |
9b4d2b63 | 42 | void __init of_fdt_limit_memory(int limit) |
704033ce LA |
43 | { |
44 | int memory; | |
45 | int len; | |
46 | const void *val; | |
47 | int nr_address_cells = OF_ROOT_NODE_ADDR_CELLS_DEFAULT; | |
48 | int nr_size_cells = OF_ROOT_NODE_SIZE_CELLS_DEFAULT; | |
17a70355 RH |
49 | const __be32 *addr_prop; |
50 | const __be32 *size_prop; | |
704033ce LA |
51 | int root_offset; |
52 | int cell_size; | |
53 | ||
54 | root_offset = fdt_path_offset(initial_boot_params, "/"); | |
55 | if (root_offset < 0) | |
56 | return; | |
57 | ||
58 | addr_prop = fdt_getprop(initial_boot_params, root_offset, | |
59 | "#address-cells", NULL); | |
60 | if (addr_prop) | |
61 | nr_address_cells = fdt32_to_cpu(*addr_prop); | |
62 | ||
63 | size_prop = fdt_getprop(initial_boot_params, root_offset, | |
64 | "#size-cells", NULL); | |
65 | if (size_prop) | |
66 | nr_size_cells = fdt32_to_cpu(*size_prop); | |
67 | ||
68 | cell_size = sizeof(uint32_t)*(nr_address_cells + nr_size_cells); | |
69 | ||
70 | memory = fdt_path_offset(initial_boot_params, "/memory"); | |
71 | if (memory > 0) { | |
72 | val = fdt_getprop(initial_boot_params, memory, "reg", &len); | |
73 | if (len > limit*cell_size) { | |
74 | len = limit*cell_size; | |
75 | pr_debug("Limiting number of entries to %d\n", limit); | |
76 | fdt_setprop(initial_boot_params, memory, "reg", val, | |
77 | len); | |
78 | } | |
79 | } | |
80 | } | |
81 | ||
ecc8a96e RH |
82 | static bool of_fdt_device_is_available(const void *blob, unsigned long node) |
83 | { | |
84 | const char *status = fdt_getprop(blob, node, "status", NULL); | |
85 | ||
86 | if (!status) | |
87 | return true; | |
88 | ||
89 | if (!strcmp(status, "ok") || !strcmp(status, "okay")) | |
90 | return true; | |
91 | ||
92 | return false; | |
93 | } | |
94 | ||
44856819 | 95 | static void *unflatten_dt_alloc(void **mem, unsigned long size, |
bbd33931 GL |
96 | unsigned long align) |
97 | { | |
98 | void *res; | |
99 | ||
44856819 GL |
100 | *mem = PTR_ALIGN(*mem, align); |
101 | res = *mem; | |
bbd33931 GL |
102 | *mem += size; |
103 | ||
104 | return res; | |
105 | } | |
106 | ||
dfbd4c6e GS |
107 | static void populate_properties(const void *blob, |
108 | int offset, | |
109 | void **mem, | |
110 | struct device_node *np, | |
111 | const char *nodename, | |
5063e25a | 112 | bool dryrun) |
bbd33931 | 113 | { |
dfbd4c6e GS |
114 | struct property *pp, **pprev = NULL; |
115 | int cur; | |
116 | bool has_name = false; | |
117 | ||
118 | pprev = &np->properties; | |
119 | for (cur = fdt_first_property_offset(blob, offset); | |
120 | cur >= 0; | |
121 | cur = fdt_next_property_offset(blob, cur)) { | |
122 | const __be32 *val; | |
123 | const char *pname; | |
124 | u32 sz; | |
125 | ||
126 | val = fdt_getprop_by_offset(blob, cur, &pname, &sz); | |
127 | if (!val) { | |
606ad42a | 128 | pr_warn("Cannot locate property at 0x%x\n", cur); |
dfbd4c6e GS |
129 | continue; |
130 | } | |
131 | ||
132 | if (!pname) { | |
606ad42a | 133 | pr_warn("Cannot find property name at 0x%x\n", cur); |
dfbd4c6e GS |
134 | continue; |
135 | } | |
136 | ||
137 | if (!strcmp(pname, "name")) | |
138 | has_name = true; | |
139 | ||
140 | pp = unflatten_dt_alloc(mem, sizeof(struct property), | |
141 | __alignof__(struct property)); | |
142 | if (dryrun) | |
143 | continue; | |
144 | ||
145 | /* We accept flattened tree phandles either in | |
146 | * ePAPR-style "phandle" properties, or the | |
147 | * legacy "linux,phandle" properties. If both | |
148 | * appear and have different values, things | |
149 | * will get weird. Don't do that. | |
150 | */ | |
151 | if (!strcmp(pname, "phandle") || | |
152 | !strcmp(pname, "linux,phandle")) { | |
153 | if (!np->phandle) | |
154 | np->phandle = be32_to_cpup(val); | |
155 | } | |
156 | ||
157 | /* And we process the "ibm,phandle" property | |
158 | * used in pSeries dynamic device tree | |
159 | * stuff | |
160 | */ | |
161 | if (!strcmp(pname, "ibm,phandle")) | |
162 | np->phandle = be32_to_cpup(val); | |
163 | ||
164 | pp->name = (char *)pname; | |
165 | pp->length = sz; | |
166 | pp->value = (__be32 *)val; | |
167 | *pprev = pp; | |
168 | pprev = &pp->next; | |
169 | } | |
170 | ||
171 | /* With version 0x10 we may not have the name property, | |
172 | * recreate it here from the unit name if absent | |
173 | */ | |
174 | if (!has_name) { | |
175 | const char *p = nodename, *ps = p, *pa = NULL; | |
176 | int len; | |
177 | ||
178 | while (*p) { | |
179 | if ((*p) == '@') | |
180 | pa = p; | |
181 | else if ((*p) == '/') | |
182 | ps = p + 1; | |
183 | p++; | |
184 | } | |
185 | ||
186 | if (pa < ps) | |
187 | pa = p; | |
188 | len = (pa - ps) + 1; | |
189 | pp = unflatten_dt_alloc(mem, sizeof(struct property) + len, | |
190 | __alignof__(struct property)); | |
191 | if (!dryrun) { | |
192 | pp->name = "name"; | |
193 | pp->length = len; | |
194 | pp->value = pp + 1; | |
195 | *pprev = pp; | |
196 | pprev = &pp->next; | |
197 | memcpy(pp->value, ps, len - 1); | |
198 | ((char *)pp->value)[len - 1] = 0; | |
199 | pr_debug("fixed up name for %s -> %s\n", | |
200 | nodename, (char *)pp->value); | |
201 | } | |
202 | } | |
203 | ||
204 | if (!dryrun) | |
205 | *pprev = NULL; | |
206 | } | |
207 | ||
a7e4cfb0 RH |
208 | static bool populate_node(const void *blob, |
209 | int offset, | |
210 | void **mem, | |
211 | struct device_node *dad, | |
212 | struct device_node **pnp, | |
213 | bool dryrun) | |
dfbd4c6e | 214 | { |
bbd33931 | 215 | struct device_node *np; |
e6a6928c | 216 | const char *pathp; |
bbd33931 | 217 | unsigned int l, allocl; |
bbd33931 | 218 | |
dfbd4c6e GS |
219 | pathp = fdt_get_name(blob, offset, &l); |
220 | if (!pathp) { | |
221 | *pnp = NULL; | |
a7e4cfb0 | 222 | return false; |
dfbd4c6e | 223 | } |
e6a6928c | 224 | |
05f4647b | 225 | allocl = ++l; |
bbd33931 | 226 | |
dfbd4c6e | 227 | np = unflatten_dt_alloc(mem, sizeof(struct device_node) + allocl, |
bbd33931 | 228 | __alignof__(struct device_node)); |
5063e25a | 229 | if (!dryrun) { |
c22618a1 | 230 | char *fn; |
0829f6d1 | 231 | of_node_init(np); |
c22618a1 | 232 | np->full_name = fn = ((char *)np) + sizeof(*np); |
a7e4cfb0 | 233 | |
c22618a1 GL |
234 | memcpy(fn, pathp, l); |
235 | ||
bbd33931 GL |
236 | if (dad != NULL) { |
237 | np->parent = dad; | |
70161ff3 GL |
238 | np->sibling = dad->child; |
239 | dad->child = np; | |
bbd33931 | 240 | } |
bbd33931 | 241 | } |
e6a6928c | 242 | |
dfbd4c6e | 243 | populate_properties(blob, offset, mem, np, pathp, dryrun); |
5063e25a | 244 | if (!dryrun) { |
bbd33931 | 245 | np->name = of_get_property(np, "name", NULL); |
bbd33931 GL |
246 | if (!np->name) |
247 | np->name = "<NULL>"; | |
bbd33931 | 248 | } |
e6a6928c | 249 | |
dfbd4c6e | 250 | *pnp = np; |
a7e4cfb0 | 251 | return true; |
dfbd4c6e GS |
252 | } |
253 | ||
50800082 GS |
254 | static void reverse_nodes(struct device_node *parent) |
255 | { | |
256 | struct device_node *child, *next; | |
257 | ||
258 | /* In-depth first */ | |
259 | child = parent->child; | |
260 | while (child) { | |
261 | reverse_nodes(child); | |
262 | ||
263 | child = child->sibling; | |
264 | } | |
265 | ||
266 | /* Reverse the nodes in the child list */ | |
267 | child = parent->child; | |
268 | parent->child = NULL; | |
269 | while (child) { | |
270 | next = child->sibling; | |
271 | ||
272 | child->sibling = parent->child; | |
273 | parent->child = child; | |
274 | child = next; | |
275 | } | |
276 | } | |
277 | ||
dfbd4c6e | 278 | /** |
947c82cb | 279 | * unflatten_dt_nodes - Alloc and populate a device_node from the flat tree |
dfbd4c6e GS |
280 | * @blob: The parent device tree blob |
281 | * @mem: Memory chunk to use for allocating device nodes and properties | |
dfbd4c6e GS |
282 | * @dad: Parent struct device_node |
283 | * @nodepp: The device_node tree created by the call | |
50800082 GS |
284 | * |
285 | * It returns the size of unflattened device tree or error code | |
dfbd4c6e | 286 | */ |
947c82cb GS |
287 | static int unflatten_dt_nodes(const void *blob, |
288 | void *mem, | |
289 | struct device_node *dad, | |
290 | struct device_node **nodepp) | |
dfbd4c6e | 291 | { |
50800082 | 292 | struct device_node *root; |
8c237cd0 | 293 | int offset = 0, depth = 0, initial_depth = 0; |
50800082 | 294 | #define FDT_MAX_DEPTH 64 |
50800082 GS |
295 | struct device_node *nps[FDT_MAX_DEPTH]; |
296 | void *base = mem; | |
297 | bool dryrun = !base; | |
dfbd4c6e | 298 | |
50800082 GS |
299 | if (nodepp) |
300 | *nodepp = NULL; | |
301 | ||
8c237cd0 GS |
302 | /* |
303 | * We're unflattening device sub-tree if @dad is valid. There are | |
304 | * possibly multiple nodes in the first level of depth. We need | |
305 | * set @depth to 1 to make fdt_next_node() happy as it bails | |
306 | * immediately when negative @depth is found. Otherwise, the device | |
307 | * nodes except the first one won't be unflattened successfully. | |
308 | */ | |
309 | if (dad) | |
310 | depth = initial_depth = 1; | |
311 | ||
50800082 | 312 | root = dad; |
78c44d91 | 313 | nps[depth] = dad; |
8c237cd0 | 314 | |
50800082 | 315 | for (offset = 0; |
8c237cd0 | 316 | offset >= 0 && depth >= initial_depth; |
50800082 GS |
317 | offset = fdt_next_node(blob, offset, &depth)) { |
318 | if (WARN_ON_ONCE(depth >= FDT_MAX_DEPTH)) | |
319 | continue; | |
dfbd4c6e | 320 | |
77ea8a68 RH |
321 | if (!IS_ENABLED(CONFIG_OF_KOBJ) && |
322 | !of_fdt_device_is_available(blob, offset)) | |
323 | continue; | |
324 | ||
a7e4cfb0 RH |
325 | if (!populate_node(blob, offset, &mem, nps[depth], |
326 | &nps[depth+1], dryrun)) | |
50800082 GS |
327 | return mem - base; |
328 | ||
329 | if (!dryrun && nodepp && !*nodepp) | |
78c44d91 | 330 | *nodepp = nps[depth+1]; |
50800082 | 331 | if (!dryrun && !root) |
78c44d91 | 332 | root = nps[depth+1]; |
50800082 | 333 | } |
e6a6928c | 334 | |
50800082 | 335 | if (offset < 0 && offset != -FDT_ERR_NOTFOUND) { |
606ad42a | 336 | pr_err("Error %d processing FDT\n", offset); |
50800082 GS |
337 | return -EINVAL; |
338 | } | |
e6a6928c | 339 | |
70161ff3 GL |
340 | /* |
341 | * Reverse the child list. Some drivers assumes node order matches .dts | |
342 | * node order | |
343 | */ | |
50800082 GS |
344 | if (!dryrun) |
345 | reverse_nodes(root); | |
e6a6928c | 346 | |
50800082 | 347 | return mem - base; |
bbd33931 | 348 | } |
41f88009 | 349 | |
fe140423 SN |
350 | /** |
351 | * __unflatten_device_tree - create tree of device_nodes from flat blob | |
352 | * | |
353 | * unflattens a device-tree, creating the | |
354 | * tree of struct device_node. It also fills the "name" and "type" | |
355 | * pointers of the nodes so the normal device-tree walking functions | |
356 | * can be used. | |
357 | * @blob: The blob to expand | |
c4263233 | 358 | * @dad: Parent device node |
fe140423 SN |
359 | * @mynodes: The device_node tree created by the call |
360 | * @dt_alloc: An allocator that provides a virtual address to memory | |
361 | * for the resulting tree | |
f5d2da67 | 362 | * @detached: if true set OF_DETACHED on @mynodes |
83262418 GS |
363 | * |
364 | * Returns NULL on failure or the memory chunk containing the unflattened | |
365 | * device tree on success. | |
fe140423 | 366 | */ |
81d0848f FR |
367 | void *__unflatten_device_tree(const void *blob, |
368 | struct device_node *dad, | |
369 | struct device_node **mynodes, | |
370 | void *(*dt_alloc)(u64 size, u64 align), | |
371 | bool detached) | |
fe140423 | 372 | { |
50800082 | 373 | int size; |
e6a6928c | 374 | void *mem; |
fe140423 SN |
375 | |
376 | pr_debug(" -> unflatten_device_tree()\n"); | |
377 | ||
378 | if (!blob) { | |
379 | pr_debug("No device tree pointer\n"); | |
83262418 | 380 | return NULL; |
fe140423 SN |
381 | } |
382 | ||
383 | pr_debug("Unflattening device tree:\n"); | |
c972de14 RH |
384 | pr_debug("magic: %08x\n", fdt_magic(blob)); |
385 | pr_debug("size: %08x\n", fdt_totalsize(blob)); | |
386 | pr_debug("version: %08x\n", fdt_version(blob)); | |
fe140423 | 387 | |
c972de14 | 388 | if (fdt_check_header(blob)) { |
fe140423 | 389 | pr_err("Invalid device tree blob header\n"); |
83262418 | 390 | return NULL; |
fe140423 SN |
391 | } |
392 | ||
393 | /* First pass, scan for size */ | |
c4263233 | 394 | size = unflatten_dt_nodes(blob, NULL, dad, NULL); |
50800082 | 395 | if (size < 0) |
83262418 | 396 | return NULL; |
fe140423 | 397 | |
50800082 GS |
398 | size = ALIGN(size, 4); |
399 | pr_debug(" size is %d, allocating...\n", size); | |
fe140423 SN |
400 | |
401 | /* Allocate memory for the expanded device tree */ | |
44856819 | 402 | mem = dt_alloc(size + 4, __alignof__(struct device_node)); |
49e67dd1 JH |
403 | if (!mem) |
404 | return NULL; | |
405 | ||
44856819 | 406 | memset(mem, 0, size); |
fe140423 | 407 | |
44856819 | 408 | *(__be32 *)(mem + size) = cpu_to_be32(0xdeadbeef); |
9e401275 | 409 | |
44856819 | 410 | pr_debug(" unflattening %p...\n", mem); |
fe140423 SN |
411 | |
412 | /* Second pass, do actual unflattening */ | |
c4263233 | 413 | unflatten_dt_nodes(blob, mem, dad, mynodes); |
44856819 | 414 | if (be32_to_cpup(mem + size) != 0xdeadbeef) |
e2f04da7 KW |
415 | pr_warn("End of tree marker overwritten: %08x\n", |
416 | be32_to_cpup(mem + size)); | |
fe140423 | 417 | |
89c67752 | 418 | if (detached && mynodes) { |
1d1bde55 MS |
419 | of_node_set_flag(*mynodes, OF_DETACHED); |
420 | pr_debug("unflattened tree is detached\n"); | |
421 | } | |
422 | ||
fe140423 | 423 | pr_debug(" <- unflatten_device_tree()\n"); |
83262418 | 424 | return mem; |
fe140423 SN |
425 | } |
426 | ||
427 | static void *kernel_tree_alloc(u64 size, u64 align) | |
428 | { | |
429 | return kzalloc(size, GFP_KERNEL); | |
430 | } | |
431 | ||
f8062386 GR |
432 | static DEFINE_MUTEX(of_fdt_unflatten_mutex); |
433 | ||
fe140423 SN |
434 | /** |
435 | * of_fdt_unflatten_tree - create tree of device_nodes from flat blob | |
c4263233 GS |
436 | * @blob: Flat device tree blob |
437 | * @dad: Parent device node | |
438 | * @mynodes: The device tree created by the call | |
fe140423 SN |
439 | * |
440 | * unflattens the device-tree passed by the firmware, creating the | |
441 | * tree of struct device_node. It also fills the "name" and "type" | |
442 | * pointers of the nodes so the normal device-tree walking functions | |
443 | * can be used. | |
83262418 GS |
444 | * |
445 | * Returns NULL on failure or the memory chunk containing the unflattened | |
446 | * device tree on success. | |
fe140423 | 447 | */ |
83262418 GS |
448 | void *of_fdt_unflatten_tree(const unsigned long *blob, |
449 | struct device_node *dad, | |
450 | struct device_node **mynodes) | |
fe140423 | 451 | { |
83262418 GS |
452 | void *mem; |
453 | ||
f8062386 | 454 | mutex_lock(&of_fdt_unflatten_mutex); |
1d1bde55 MS |
455 | mem = __unflatten_device_tree(blob, dad, mynodes, &kernel_tree_alloc, |
456 | true); | |
f8062386 | 457 | mutex_unlock(&of_fdt_unflatten_mutex); |
83262418 GS |
458 | |
459 | return mem; | |
fe140423 SN |
460 | } |
461 | EXPORT_SYMBOL_GPL(of_fdt_unflatten_tree); | |
462 | ||
57d00ecf SN |
463 | /* Everything below here references initial_boot_params directly. */ |
464 | int __initdata dt_root_addr_cells; | |
465 | int __initdata dt_root_size_cells; | |
466 | ||
7c71650f | 467 | void *initial_boot_params __ro_after_init; |
57d00ecf SN |
468 | |
469 | #ifdef CONFIG_OF_EARLY_FLATTREE | |
470 | ||
08d53aa5 AB |
471 | static u32 of_fdt_crc32; |
472 | ||
e8d9d1f5 MS |
473 | /** |
474 | * res_mem_reserve_reg() - reserve all memory described in 'reg' property | |
475 | */ | |
476 | static int __init __reserved_mem_reserve_reg(unsigned long node, | |
477 | const char *uname) | |
478 | { | |
479 | int t_len = (dt_root_addr_cells + dt_root_size_cells) * sizeof(__be32); | |
480 | phys_addr_t base, size; | |
9d0c4dfe RH |
481 | int len; |
482 | const __be32 *prop; | |
5c68b823 MY |
483 | int first = 1; |
484 | bool nomap; | |
e8d9d1f5 MS |
485 | |
486 | prop = of_get_flat_dt_prop(node, "reg", &len); | |
487 | if (!prop) | |
488 | return -ENOENT; | |
489 | ||
490 | if (len && len % t_len != 0) { | |
491 | pr_err("Reserved memory: invalid reg property in '%s', skipping node.\n", | |
492 | uname); | |
493 | return -EINVAL; | |
494 | } | |
495 | ||
496 | nomap = of_get_flat_dt_prop(node, "no-map", NULL) != NULL; | |
497 | ||
498 | while (len >= t_len) { | |
499 | base = dt_mem_next_cell(dt_root_addr_cells, &prop); | |
500 | size = dt_mem_next_cell(dt_root_size_cells, &prop); | |
501 | ||
b5f2a8c0 | 502 | if (size && |
e8d9d1f5 MS |
503 | early_init_dt_reserve_memory_arch(base, size, nomap) == 0) |
504 | pr_debug("Reserved memory: reserved region for node '%s': base %pa, size %ld MiB\n", | |
505 | uname, &base, (unsigned long)size / SZ_1M); | |
506 | else | |
507 | pr_info("Reserved memory: failed to reserve memory for node '%s': base %pa, size %ld MiB\n", | |
508 | uname, &base, (unsigned long)size / SZ_1M); | |
509 | ||
510 | len -= t_len; | |
3f0c8206 MS |
511 | if (first) { |
512 | fdt_reserved_mem_save_node(node, uname, base, size); | |
513 | first = 0; | |
514 | } | |
e8d9d1f5 MS |
515 | } |
516 | return 0; | |
517 | } | |
518 | ||
519 | /** | |
520 | * __reserved_mem_check_root() - check if #size-cells, #address-cells provided | |
521 | * in /reserved-memory matches the values supported by the current implementation, | |
522 | * also check if ranges property has been provided | |
523 | */ | |
5b624118 | 524 | static int __init __reserved_mem_check_root(unsigned long node) |
e8d9d1f5 | 525 | { |
9d0c4dfe | 526 | const __be32 *prop; |
e8d9d1f5 MS |
527 | |
528 | prop = of_get_flat_dt_prop(node, "#size-cells", NULL); | |
529 | if (!prop || be32_to_cpup(prop) != dt_root_size_cells) | |
530 | return -EINVAL; | |
531 | ||
532 | prop = of_get_flat_dt_prop(node, "#address-cells", NULL); | |
533 | if (!prop || be32_to_cpup(prop) != dt_root_addr_cells) | |
534 | return -EINVAL; | |
535 | ||
536 | prop = of_get_flat_dt_prop(node, "ranges", NULL); | |
537 | if (!prop) | |
538 | return -EINVAL; | |
539 | return 0; | |
540 | } | |
541 | ||
542 | /** | |
543 | * fdt_scan_reserved_mem() - scan a single FDT node for reserved memory | |
544 | */ | |
545 | static int __init __fdt_scan_reserved_mem(unsigned long node, const char *uname, | |
546 | int depth, void *data) | |
547 | { | |
548 | static int found; | |
3f0c8206 | 549 | int err; |
e8d9d1f5 MS |
550 | |
551 | if (!found && depth == 1 && strcmp(uname, "reserved-memory") == 0) { | |
552 | if (__reserved_mem_check_root(node) != 0) { | |
553 | pr_err("Reserved memory: unsupported node format, ignoring\n"); | |
554 | /* break scan */ | |
555 | return 1; | |
556 | } | |
557 | found = 1; | |
558 | /* scan next node */ | |
559 | return 0; | |
560 | } else if (!found) { | |
561 | /* scan next node */ | |
562 | return 0; | |
563 | } else if (found && depth < 2) { | |
564 | /* scanning of /reserved-memory has been finished */ | |
565 | return 1; | |
566 | } | |
567 | ||
ecc8a96e | 568 | if (!of_fdt_device_is_available(initial_boot_params, node)) |
e8d9d1f5 MS |
569 | return 0; |
570 | ||
3f0c8206 MS |
571 | err = __reserved_mem_reserve_reg(node, uname); |
572 | if (err == -ENOENT && of_get_flat_dt_prop(node, "size", NULL)) | |
573 | fdt_reserved_mem_save_node(node, uname, 0, 0); | |
e8d9d1f5 MS |
574 | |
575 | /* scan next node */ | |
576 | return 0; | |
577 | } | |
578 | ||
579 | /** | |
580 | * early_init_fdt_scan_reserved_mem() - create reserved memory regions | |
581 | * | |
582 | * This function grabs memory from early allocator for device exclusive use | |
583 | * defined in device tree structures. It should be called by arch specific code | |
584 | * once the early allocator (i.e. memblock) has been fully activated. | |
585 | */ | |
586 | void __init early_init_fdt_scan_reserved_mem(void) | |
587 | { | |
d1552ce4 RH |
588 | int n; |
589 | u64 base, size; | |
590 | ||
2040b527 JC |
591 | if (!initial_boot_params) |
592 | return; | |
593 | ||
d1552ce4 RH |
594 | /* Process header /memreserve/ fields */ |
595 | for (n = 0; ; n++) { | |
596 | fdt_get_mem_rsv(initial_boot_params, n, &base, &size); | |
597 | if (!size) | |
598 | break; | |
5c68b823 | 599 | early_init_dt_reserve_memory_arch(base, size, false); |
d1552ce4 RH |
600 | } |
601 | ||
e8d9d1f5 | 602 | of_scan_flat_dt(__fdt_scan_reserved_mem, NULL); |
3f0c8206 | 603 | fdt_init_reserved_mem(); |
e8d9d1f5 MS |
604 | } |
605 | ||
24bbd929 AB |
606 | /** |
607 | * early_init_fdt_reserve_self() - reserve the memory used by the FDT blob | |
608 | */ | |
609 | void __init early_init_fdt_reserve_self(void) | |
610 | { | |
611 | if (!initial_boot_params) | |
612 | return; | |
613 | ||
614 | /* Reserve the dtb region */ | |
615 | early_init_dt_reserve_memory_arch(__pa(initial_boot_params), | |
616 | fdt_totalsize(initial_boot_params), | |
5c68b823 | 617 | false); |
24bbd929 AB |
618 | } |
619 | ||
57d00ecf SN |
620 | /** |
621 | * of_scan_flat_dt - scan flattened tree blob and call callback on each. | |
622 | * @it: callback function | |
623 | * @data: context data pointer | |
624 | * | |
625 | * This function is used to scan the flattened device-tree, it is | |
626 | * used to extract the memory information at boot before we can | |
627 | * unflatten the tree | |
628 | */ | |
629 | int __init of_scan_flat_dt(int (*it)(unsigned long node, | |
630 | const char *uname, int depth, | |
631 | void *data), | |
632 | void *data) | |
633 | { | |
e6a6928c RH |
634 | const void *blob = initial_boot_params; |
635 | const char *pathp; | |
636 | int offset, rc = 0, depth = -1; | |
637 | ||
3ec75441 TW |
638 | if (!blob) |
639 | return 0; | |
640 | ||
641 | for (offset = fdt_next_node(blob, -1, &depth); | |
642 | offset >= 0 && depth >= 0 && !rc; | |
643 | offset = fdt_next_node(blob, offset, &depth)) { | |
e6a6928c RH |
644 | |
645 | pathp = fdt_get_name(blob, offset, NULL); | |
375da3a7 AS |
646 | if (*pathp == '/') |
647 | pathp = kbasename(pathp); | |
e6a6928c RH |
648 | rc = it(offset, pathp, depth, data); |
649 | } | |
57d00ecf SN |
650 | return rc; |
651 | } | |
652 | ||
ea47dd19 NP |
653 | /** |
654 | * of_scan_flat_dt_subnodes - scan sub-nodes of a node call callback on each. | |
655 | * @it: callback function | |
656 | * @data: context data pointer | |
657 | * | |
658 | * This function is used to scan sub-nodes of a node. | |
659 | */ | |
660 | int __init of_scan_flat_dt_subnodes(unsigned long parent, | |
661 | int (*it)(unsigned long node, | |
662 | const char *uname, | |
663 | void *data), | |
664 | void *data) | |
665 | { | |
666 | const void *blob = initial_boot_params; | |
667 | int node; | |
668 | ||
669 | fdt_for_each_subnode(node, blob, parent) { | |
670 | const char *pathp; | |
671 | int rc; | |
672 | ||
673 | pathp = fdt_get_name(blob, node, NULL); | |
674 | if (*pathp == '/') | |
675 | pathp = kbasename(pathp); | |
676 | rc = it(node, pathp, data); | |
677 | if (rc) | |
678 | return rc; | |
679 | } | |
680 | return 0; | |
681 | } | |
682 | ||
9c609868 SZ |
683 | /** |
684 | * of_get_flat_dt_subnode_by_name - get the subnode by given name | |
685 | * | |
686 | * @node: the parent node | |
687 | * @uname: the name of subnode | |
688 | * @return offset of the subnode, or -FDT_ERR_NOTFOUND if there is none | |
689 | */ | |
690 | ||
9b4d2b63 | 691 | int __init of_get_flat_dt_subnode_by_name(unsigned long node, const char *uname) |
9c609868 SZ |
692 | { |
693 | return fdt_subnode_offset(initial_boot_params, node, uname); | |
694 | } | |
695 | ||
57d00ecf SN |
696 | /** |
697 | * of_get_flat_dt_root - find the root node in the flat blob | |
698 | */ | |
699 | unsigned long __init of_get_flat_dt_root(void) | |
700 | { | |
e6a6928c | 701 | return 0; |
57d00ecf SN |
702 | } |
703 | ||
704 | /** | |
705 | * of_get_flat_dt_prop - Given a node in the flat blob, return the property ptr | |
706 | * | |
707 | * This function can be used within scan_flattened_dt callback to get | |
708 | * access to properties | |
709 | */ | |
9d0c4dfe RH |
710 | const void *__init of_get_flat_dt_prop(unsigned long node, const char *name, |
711 | int *size) | |
57d00ecf | 712 | { |
e6a6928c | 713 | return fdt_getprop(initial_boot_params, node, name, size); |
57d00ecf SN |
714 | } |
715 | ||
5d9c4e95 KW |
716 | /** |
717 | * of_fdt_is_compatible - Return true if given node from the given blob has | |
718 | * compat in its compatible list | |
719 | * @blob: A device tree blob | |
720 | * @node: node to test | |
721 | * @compat: compatible string to compare with compatible list. | |
722 | * | |
723 | * On match, returns a non-zero value with smaller values returned for more | |
724 | * specific compatible values. | |
725 | */ | |
726 | static int of_fdt_is_compatible(const void *blob, | |
727 | unsigned long node, const char *compat) | |
728 | { | |
729 | const char *cp; | |
730 | int cplen; | |
731 | unsigned long l, score = 0; | |
732 | ||
733 | cp = fdt_getprop(blob, node, "compatible", &cplen); | |
734 | if (cp == NULL) | |
735 | return 0; | |
736 | while (cplen > 0) { | |
737 | score++; | |
738 | if (of_compat_cmp(cp, compat, strlen(compat)) == 0) | |
739 | return score; | |
740 | l = strlen(cp) + 1; | |
741 | cp += l; | |
742 | cplen -= l; | |
743 | } | |
744 | ||
745 | return 0; | |
746 | } | |
747 | ||
57d00ecf SN |
748 | /** |
749 | * of_flat_dt_is_compatible - Return true if given node has compat in compatible list | |
750 | * @node: node to test | |
751 | * @compat: compatible string to compare with compatible list. | |
752 | */ | |
753 | int __init of_flat_dt_is_compatible(unsigned long node, const char *compat) | |
754 | { | |
755 | return of_fdt_is_compatible(initial_boot_params, node, compat); | |
756 | } | |
757 | ||
a4f740cf GL |
758 | /** |
759 | * of_flat_dt_match - Return true if node matches a list of compatible values | |
760 | */ | |
9b4d2b63 | 761 | static int __init of_flat_dt_match(unsigned long node, const char *const *compat) |
a4f740cf | 762 | { |
5d9c4e95 KW |
763 | unsigned int tmp, score = 0; |
764 | ||
765 | if (!compat) | |
766 | return 0; | |
767 | ||
768 | while (*compat) { | |
769 | tmp = of_fdt_is_compatible(initial_boot_params, node, *compat); | |
770 | if (tmp && (score == 0 || (tmp < score))) | |
771 | score = tmp; | |
772 | compat++; | |
773 | } | |
774 | ||
775 | return score; | |
a4f740cf GL |
776 | } |
777 | ||
ea47dd19 NP |
778 | /** |
779 | * of_get_flat_dt_prop - Given a node in the flat blob, return the phandle | |
780 | */ | |
781 | uint32_t __init of_get_flat_dt_phandle(unsigned long node) | |
782 | { | |
783 | return fdt_get_phandle(initial_boot_params, node); | |
784 | } | |
785 | ||
57d74bcf MS |
786 | struct fdt_scan_status { |
787 | const char *name; | |
788 | int namelen; | |
789 | int depth; | |
790 | int found; | |
791 | int (*iterator)(unsigned long node, const char *uname, int depth, void *data); | |
792 | void *data; | |
793 | }; | |
794 | ||
6a903a25 RH |
795 | const char * __init of_flat_dt_get_machine_name(void) |
796 | { | |
797 | const char *name; | |
798 | unsigned long dt_root = of_get_flat_dt_root(); | |
799 | ||
800 | name = of_get_flat_dt_prop(dt_root, "model", NULL); | |
801 | if (!name) | |
802 | name = of_get_flat_dt_prop(dt_root, "compatible", NULL); | |
803 | return name; | |
804 | } | |
805 | ||
806 | /** | |
807 | * of_flat_dt_match_machine - Iterate match tables to find matching machine. | |
808 | * | |
809 | * @default_match: A machine specific ptr to return in case of no match. | |
810 | * @get_next_compat: callback function to return next compatible match table. | |
811 | * | |
812 | * Iterate through machine match tables to find the best match for the machine | |
813 | * compatible string in the FDT. | |
814 | */ | |
815 | const void * __init of_flat_dt_match_machine(const void *default_match, | |
816 | const void * (*get_next_compat)(const char * const**)) | |
817 | { | |
818 | const void *data = NULL; | |
819 | const void *best_data = default_match; | |
820 | const char *const *compat; | |
821 | unsigned long dt_root; | |
822 | unsigned int best_score = ~1, score = 0; | |
823 | ||
824 | dt_root = of_get_flat_dt_root(); | |
825 | while ((data = get_next_compat(&compat))) { | |
826 | score = of_flat_dt_match(dt_root, compat); | |
827 | if (score > 0 && score < best_score) { | |
828 | best_data = data; | |
829 | best_score = score; | |
830 | } | |
831 | } | |
832 | if (!best_data) { | |
833 | const char *prop; | |
9d0c4dfe | 834 | int size; |
6a903a25 RH |
835 | |
836 | pr_err("\n unrecognized device tree list:\n[ "); | |
837 | ||
838 | prop = of_get_flat_dt_prop(dt_root, "compatible", &size); | |
839 | if (prop) { | |
840 | while (size > 0) { | |
841 | printk("'%s' ", prop); | |
842 | size -= strlen(prop) + 1; | |
843 | prop += strlen(prop) + 1; | |
844 | } | |
845 | } | |
846 | printk("]\n\n"); | |
847 | return NULL; | |
848 | } | |
849 | ||
850 | pr_info("Machine model: %s\n", of_flat_dt_get_machine_name()); | |
851 | ||
852 | return best_data; | |
853 | } | |
854 | ||
f7b3a835 | 855 | #ifdef CONFIG_BLK_DEV_INITRD |
369bc9ab AB |
856 | static void __early_init_dt_declare_initrd(unsigned long start, |
857 | unsigned long end) | |
858 | { | |
cdbc848b FF |
859 | /* ARM64 would cause a BUG to occur here when CONFIG_DEBUG_VM is |
860 | * enabled since __va() is called too early. ARM64 does make use | |
861 | * of phys_initrd_start/phys_initrd_size so we can skip this | |
862 | * conversion. | |
863 | */ | |
864 | if (!IS_ENABLED(CONFIG_ARM64)) { | |
865 | initrd_start = (unsigned long)__va(start); | |
866 | initrd_end = (unsigned long)__va(end); | |
867 | initrd_below_start_ok = 1; | |
868 | } | |
369bc9ab | 869 | } |
369bc9ab | 870 | |
f7b3a835 GL |
871 | /** |
872 | * early_init_dt_check_for_initrd - Decode initrd location from flat tree | |
873 | * @node: reference to node containing initrd location ('chosen') | |
874 | */ | |
29eb45a9 | 875 | static void __init early_init_dt_check_for_initrd(unsigned long node) |
f7b3a835 | 876 | { |
374d5c99 | 877 | u64 start, end; |
9d0c4dfe RH |
878 | int len; |
879 | const __be32 *prop; | |
f7b3a835 GL |
880 | |
881 | pr_debug("Looking for initrd properties... "); | |
882 | ||
883 | prop = of_get_flat_dt_prop(node, "linux,initrd-start", &len); | |
1406bc2f JK |
884 | if (!prop) |
885 | return; | |
374d5c99 | 886 | start = of_read_number(prop, len/4); |
1406bc2f JK |
887 | |
888 | prop = of_get_flat_dt_prop(node, "linux,initrd-end", &len); | |
889 | if (!prop) | |
890 | return; | |
374d5c99 | 891 | end = of_read_number(prop, len/4); |
f7b3a835 | 892 | |
369bc9ab | 893 | __early_init_dt_declare_initrd(start, end); |
fe7db757 FF |
894 | phys_initrd_start = start; |
895 | phys_initrd_size = end - start; | |
29eb45a9 | 896 | |
374d5c99 SS |
897 | pr_debug("initrd_start=0x%llx initrd_end=0x%llx\n", |
898 | (unsigned long long)start, (unsigned long long)end); | |
f7b3a835 GL |
899 | } |
900 | #else | |
29eb45a9 | 901 | static inline void early_init_dt_check_for_initrd(unsigned long node) |
f7b3a835 GL |
902 | { |
903 | } | |
904 | #endif /* CONFIG_BLK_DEV_INITRD */ | |
905 | ||
fb11ffe7 | 906 | #ifdef CONFIG_SERIAL_EARLYCON |
fb11ffe7 | 907 | |
d503187b | 908 | int __init early_init_dt_scan_chosen_stdout(void) |
fb11ffe7 RH |
909 | { |
910 | int offset; | |
4d118c9a | 911 | const char *p, *q, *options = NULL; |
fb11ffe7 | 912 | int l; |
dd709e72 | 913 | const struct earlycon_id **p_match; |
fb11ffe7 RH |
914 | const void *fdt = initial_boot_params; |
915 | ||
916 | offset = fdt_path_offset(fdt, "/chosen"); | |
917 | if (offset < 0) | |
918 | offset = fdt_path_offset(fdt, "/chosen@0"); | |
919 | if (offset < 0) | |
920 | return -ENOENT; | |
921 | ||
922 | p = fdt_getprop(fdt, offset, "stdout-path", &l); | |
923 | if (!p) | |
924 | p = fdt_getprop(fdt, offset, "linux,stdout-path", &l); | |
925 | if (!p || !l) | |
926 | return -ENOENT; | |
927 | ||
4d118c9a PH |
928 | q = strchrnul(p, ':'); |
929 | if (*q != '\0') | |
930 | options = q + 1; | |
0fcc286f | 931 | l = q - p; |
6296ad9e | 932 | |
fb11ffe7 | 933 | /* Get the node specified by stdout-path */ |
0fcc286f PH |
934 | offset = fdt_path_offset_namelen(fdt, p, l); |
935 | if (offset < 0) { | |
936 | pr_warn("earlycon: stdout-path %.*s not found\n", l, p); | |
937 | return 0; | |
938 | } | |
fb11ffe7 | 939 | |
dd709e72 DK |
940 | for (p_match = __earlycon_table; p_match < __earlycon_table_end; |
941 | p_match++) { | |
942 | const struct earlycon_id *match = *p_match; | |
943 | ||
2eaa7909 PH |
944 | if (!match->compatible[0]) |
945 | continue; | |
946 | ||
947 | if (fdt_node_check_compatible(fdt, offset, match->compatible)) | |
fb11ffe7 | 948 | continue; |
fb11ffe7 | 949 | |
b2047316 CH |
950 | if (of_setup_earlycon(match, offset, options) == 0) |
951 | return 0; | |
fb11ffe7 RH |
952 | } |
953 | return -ENODEV; | |
954 | } | |
fb11ffe7 RH |
955 | #endif |
956 | ||
f00abd94 GL |
957 | /** |
958 | * early_init_dt_scan_root - fetch the top level address and size cells | |
959 | */ | |
960 | int __init early_init_dt_scan_root(unsigned long node, const char *uname, | |
961 | int depth, void *data) | |
962 | { | |
9d0c4dfe | 963 | const __be32 *prop; |
f00abd94 GL |
964 | |
965 | if (depth != 0) | |
966 | return 0; | |
967 | ||
33714881 JK |
968 | dt_root_size_cells = OF_ROOT_NODE_SIZE_CELLS_DEFAULT; |
969 | dt_root_addr_cells = OF_ROOT_NODE_ADDR_CELLS_DEFAULT; | |
970 | ||
f00abd94 | 971 | prop = of_get_flat_dt_prop(node, "#size-cells", NULL); |
33714881 JK |
972 | if (prop) |
973 | dt_root_size_cells = be32_to_cpup(prop); | |
f00abd94 GL |
974 | pr_debug("dt_root_size_cells = %x\n", dt_root_size_cells); |
975 | ||
976 | prop = of_get_flat_dt_prop(node, "#address-cells", NULL); | |
33714881 JK |
977 | if (prop) |
978 | dt_root_addr_cells = be32_to_cpup(prop); | |
f00abd94 GL |
979 | pr_debug("dt_root_addr_cells = %x\n", dt_root_addr_cells); |
980 | ||
981 | /* break now */ | |
982 | return 1; | |
983 | } | |
984 | ||
9d0c4dfe | 985 | u64 __init dt_mem_next_cell(int s, const __be32 **cellp) |
83f7a06e | 986 | { |
9d0c4dfe | 987 | const __be32 *p = *cellp; |
83f7a06e GL |
988 | |
989 | *cellp = p + s; | |
990 | return of_read_number(p, s); | |
991 | } | |
992 | ||
51975db0 | 993 | /** |
0ef5adca | 994 | * early_init_dt_scan_memory - Look for and parse memory nodes |
51975db0 GL |
995 | */ |
996 | int __init early_init_dt_scan_memory(unsigned long node, const char *uname, | |
997 | int depth, void *data) | |
998 | { | |
9d0c4dfe RH |
999 | const char *type = of_get_flat_dt_prop(node, "device_type", NULL); |
1000 | const __be32 *reg, *endp; | |
1001 | int l; | |
41a9ada3 | 1002 | bool hotpluggable; |
51975db0 GL |
1003 | |
1004 | /* We are scanning "memory" nodes only */ | |
da653130 | 1005 | if (type == NULL || strcmp(type, "memory") != 0) |
51975db0 GL |
1006 | return 0; |
1007 | ||
1008 | reg = of_get_flat_dt_prop(node, "linux,usable-memory", &l); | |
1009 | if (reg == NULL) | |
1010 | reg = of_get_flat_dt_prop(node, "reg", &l); | |
1011 | if (reg == NULL) | |
1012 | return 0; | |
1013 | ||
1014 | endp = reg + (l / sizeof(__be32)); | |
41a9ada3 | 1015 | hotpluggable = of_get_flat_dt_prop(node, "hotpluggable", NULL); |
51975db0 | 1016 | |
c954b36e | 1017 | pr_debug("memory scan node %s, reg size %d,\n", uname, l); |
51975db0 GL |
1018 | |
1019 | while ((endp - reg) >= (dt_root_addr_cells + dt_root_size_cells)) { | |
1020 | u64 base, size; | |
1021 | ||
1022 | base = dt_mem_next_cell(dt_root_addr_cells, ®); | |
1023 | size = dt_mem_next_cell(dt_root_size_cells, ®); | |
1024 | ||
1025 | if (size == 0) | |
1026 | continue; | |
1027 | pr_debug(" - %llx , %llx\n", (unsigned long long)base, | |
1028 | (unsigned long long)size); | |
1029 | ||
1030 | early_init_dt_add_memory_arch(base, size); | |
41a9ada3 RA |
1031 | |
1032 | if (!hotpluggable) | |
1033 | continue; | |
1034 | ||
1035 | if (early_init_dt_mark_hotplug_memory_arch(base, size)) | |
1036 | pr_warn("failed to mark hotplug range 0x%llx - 0x%llx\n", | |
1037 | base, base + size); | |
51975db0 GL |
1038 | } |
1039 | ||
1040 | return 0; | |
1041 | } | |
1042 | ||
86e03221 GL |
1043 | int __init early_init_dt_scan_chosen(unsigned long node, const char *uname, |
1044 | int depth, void *data) | |
1045 | { | |
9d0c4dfe RH |
1046 | int l; |
1047 | const char *p; | |
428826f5 | 1048 | const void *rng_seed; |
86e03221 GL |
1049 | |
1050 | pr_debug("search \"chosen\", depth: %d, uname: %s\n", depth, uname); | |
1051 | ||
85f60ae4 | 1052 | if (depth != 1 || !data || |
86e03221 GL |
1053 | (strcmp(uname, "chosen") != 0 && strcmp(uname, "chosen@0") != 0)) |
1054 | return 0; | |
1055 | ||
1056 | early_init_dt_check_for_initrd(node); | |
1057 | ||
25985edc | 1058 | /* Retrieve command line */ |
86e03221 GL |
1059 | p = of_get_flat_dt_prop(node, "bootargs", &l); |
1060 | if (p != NULL && l > 0) | |
b827bcbb | 1061 | strlcpy(data, p, min(l, COMMAND_LINE_SIZE)); |
86e03221 | 1062 | |
78b782cb BH |
1063 | /* |
1064 | * CONFIG_CMDLINE is meant to be a default in case nothing else | |
1065 | * managed to set the command line, unless CONFIG_CMDLINE_FORCE | |
1066 | * is set in which case we override whatever was found earlier. | |
1067 | */ | |
86e03221 | 1068 | #ifdef CONFIG_CMDLINE |
34b82026 MU |
1069 | #if defined(CONFIG_CMDLINE_EXTEND) |
1070 | strlcat(data, " ", COMMAND_LINE_SIZE); | |
1071 | strlcat(data, CONFIG_CMDLINE, COMMAND_LINE_SIZE); | |
1072 | #elif defined(CONFIG_CMDLINE_FORCE) | |
1073 | strlcpy(data, CONFIG_CMDLINE, COMMAND_LINE_SIZE); | |
1074 | #else | |
1075 | /* No arguments from boot loader, use kernel's cmdl*/ | |
78b782cb | 1076 | if (!((char *)data)[0]) |
85f60ae4 | 1077 | strlcpy(data, CONFIG_CMDLINE, COMMAND_LINE_SIZE); |
34b82026 | 1078 | #endif |
86e03221 GL |
1079 | #endif /* CONFIG_CMDLINE */ |
1080 | ||
85f60ae4 | 1081 | pr_debug("Command line is: %s\n", (char*)data); |
86e03221 | 1082 | |
428826f5 HYW |
1083 | rng_seed = of_get_flat_dt_prop(node, "rng-seed", &l); |
1084 | if (rng_seed && l > 0) { | |
1085 | add_bootloader_randomness(rng_seed, l); | |
1086 | ||
1087 | /* try to clear seed so it won't be found. */ | |
1088 | fdt_nop_property(initial_boot_params, node, "rng-seed"); | |
dd753d96 HYW |
1089 | |
1090 | /* update CRC check value */ | |
1091 | of_fdt_crc32 = crc32_be(~0, initial_boot_params, | |
1092 | fdt_totalsize(initial_boot_params)); | |
428826f5 HYW |
1093 | } |
1094 | ||
86e03221 GL |
1095 | /* break now */ |
1096 | return 1; | |
1097 | } | |
1098 | ||
270522a0 AB |
1099 | #ifndef MIN_MEMBLOCK_ADDR |
1100 | #define MIN_MEMBLOCK_ADDR __pa(PAGE_OFFSET) | |
1101 | #endif | |
8eafeb48 AB |
1102 | #ifndef MAX_MEMBLOCK_ADDR |
1103 | #define MAX_MEMBLOCK_ADDR ((phys_addr_t)~0) | |
1104 | #endif | |
3069f0c0 | 1105 | |
068f6310 RH |
1106 | void __init __weak early_init_dt_add_memory_arch(u64 base, u64 size) |
1107 | { | |
270522a0 | 1108 | const u64 phys_offset = MIN_MEMBLOCK_ADDR; |
8f73d4b7 | 1109 | |
6072cf56 MR |
1110 | if (size < PAGE_SIZE - (base & ~PAGE_MASK)) { |
1111 | pr_warn("Ignoring memory block 0x%llx - 0x%llx\n", | |
1112 | base, base + size); | |
1113 | return; | |
1114 | } | |
1115 | ||
8f73d4b7 GU |
1116 | if (!PAGE_ALIGNED(base)) { |
1117 | size -= PAGE_SIZE - (base & ~PAGE_MASK); | |
1118 | base = PAGE_ALIGN(base); | |
1119 | } | |
068f6310 | 1120 | size &= PAGE_MASK; |
a67a6ed1 | 1121 | |
8eafeb48 | 1122 | if (base > MAX_MEMBLOCK_ADDR) { |
e2f04da7 KW |
1123 | pr_warn("Ignoring memory block 0x%llx - 0x%llx\n", |
1124 | base, base + size); | |
3069f0c0 LA |
1125 | return; |
1126 | } | |
a67a6ed1 | 1127 | |
8eafeb48 | 1128 | if (base + size - 1 > MAX_MEMBLOCK_ADDR) { |
e2f04da7 KW |
1129 | pr_warn("Ignoring memory range 0x%llx - 0x%llx\n", |
1130 | ((u64)MAX_MEMBLOCK_ADDR) + 1, base + size); | |
8eafeb48 | 1131 | size = MAX_MEMBLOCK_ADDR - base + 1; |
a67a6ed1 LA |
1132 | } |
1133 | ||
068f6310 | 1134 | if (base + size < phys_offset) { |
e2f04da7 KW |
1135 | pr_warn("Ignoring memory block 0x%llx - 0x%llx\n", |
1136 | base, base + size); | |
068f6310 RH |
1137 | return; |
1138 | } | |
1139 | if (base < phys_offset) { | |
e2f04da7 KW |
1140 | pr_warn("Ignoring memory range 0x%llx - 0x%llx\n", |
1141 | base, phys_offset); | |
068f6310 RH |
1142 | size -= phys_offset - base; |
1143 | base = phys_offset; | |
1144 | } | |
1145 | memblock_add(base, size); | |
1146 | } | |
1147 | ||
41a9ada3 RA |
1148 | int __init __weak early_init_dt_mark_hotplug_memory_arch(u64 base, u64 size) |
1149 | { | |
1150 | return memblock_mark_hotplug(base, size); | |
1151 | } | |
1152 | ||
e8d9d1f5 MS |
1153 | int __init __weak early_init_dt_reserve_memory_arch(phys_addr_t base, |
1154 | phys_addr_t size, bool nomap) | |
1155 | { | |
e8d9d1f5 MS |
1156 | if (nomap) |
1157 | return memblock_remove(base, size); | |
1158 | return memblock_reserve(base, size); | |
1159 | } | |
1160 | ||
0fa1c579 | 1161 | static void * __init early_init_dt_alloc_memory_arch(u64 size, u64 align) |
aefc7ec2 | 1162 | { |
8a7f97b9 MR |
1163 | void *ptr = memblock_alloc(size, align); |
1164 | ||
1165 | if (!ptr) | |
1166 | panic("%s: Failed to allocate %llu bytes align=0x%llx\n", | |
1167 | __func__, size, align); | |
1168 | ||
1169 | return ptr; | |
aefc7ec2 | 1170 | } |
a1727da5 | 1171 | |
4972a74b | 1172 | bool __init early_init_dt_verify(void *params) |
0288ffcb RH |
1173 | { |
1174 | if (!params) | |
1175 | return false; | |
1176 | ||
0288ffcb | 1177 | /* check device tree validity */ |
50ba08f3 | 1178 | if (fdt_check_header(params)) |
0288ffcb | 1179 | return false; |
0288ffcb | 1180 | |
50ba08f3 BH |
1181 | /* Setup flat device-tree pointer */ |
1182 | initial_boot_params = params; | |
dd753d96 HYW |
1183 | of_fdt_crc32 = crc32_be(~0, initial_boot_params, |
1184 | fdt_totalsize(initial_boot_params)); | |
4972a74b LA |
1185 | return true; |
1186 | } | |
1187 | ||
1188 | ||
1189 | void __init early_init_dt_scan_nodes(void) | |
1190 | { | |
e1e52544 NK |
1191 | int rc = 0; |
1192 | ||
0288ffcb | 1193 | /* Retrieve various information from the /chosen node */ |
e1e52544 NK |
1194 | rc = of_scan_flat_dt(early_init_dt_scan_chosen, boot_command_line); |
1195 | if (!rc) | |
1196 | pr_warn("No chosen node found, continuing without\n"); | |
0288ffcb RH |
1197 | |
1198 | /* Initialize {size,address}-cells info */ | |
1199 | of_scan_flat_dt(early_init_dt_scan_root, NULL); | |
1200 | ||
1201 | /* Setup memory, calling early_init_dt_add_memory_arch */ | |
1202 | of_scan_flat_dt(early_init_dt_scan_memory, NULL); | |
4972a74b LA |
1203 | } |
1204 | ||
1205 | bool __init early_init_dt_scan(void *params) | |
1206 | { | |
1207 | bool status; | |
1208 | ||
1209 | status = early_init_dt_verify(params); | |
1210 | if (!status) | |
1211 | return false; | |
0288ffcb | 1212 | |
4972a74b | 1213 | early_init_dt_scan_nodes(); |
0288ffcb RH |
1214 | return true; |
1215 | } | |
1216 | ||
41f88009 GL |
1217 | /** |
1218 | * unflatten_device_tree - create tree of device_nodes from flat blob | |
1219 | * | |
1220 | * unflattens the device-tree passed by the firmware, creating the | |
1221 | * tree of struct device_node. It also fills the "name" and "type" | |
1222 | * pointers of the nodes so the normal device-tree walking functions | |
1223 | * can be used. | |
1224 | */ | |
1225 | void __init unflatten_device_tree(void) | |
1226 | { | |
c4263233 | 1227 | __unflatten_device_tree(initial_boot_params, NULL, &of_root, |
1d1bde55 | 1228 | early_init_dt_alloc_memory_arch, false); |
41f88009 | 1229 | |
4c7d6361 | 1230 | /* Get pointer to "/chosen" and "/aliases" nodes for use everywhere */ |
611cad72 | 1231 | of_alias_scan(early_init_dt_alloc_memory_arch); |
81d0848f FR |
1232 | |
1233 | unittest_unflatten_overlay_base(); | |
41f88009 | 1234 | } |
e6ce1324 | 1235 | |
a8bf7527 RH |
1236 | /** |
1237 | * unflatten_and_copy_device_tree - copy and create tree of device_nodes from flat blob | |
1238 | * | |
1239 | * Copies and unflattens the device-tree passed by the firmware, creating the | |
1240 | * tree of struct device_node. It also fills the "name" and "type" | |
1241 | * pointers of the nodes so the normal device-tree walking functions | |
1242 | * can be used. This should only be used when the FDT memory has not been | |
1243 | * reserved such is the case when the FDT is built-in to the kernel init | |
1244 | * section. If the FDT memory is reserved already then unflatten_device_tree | |
1245 | * should be used instead. | |
1246 | */ | |
1247 | void __init unflatten_and_copy_device_tree(void) | |
1248 | { | |
6f041e99 JH |
1249 | int size; |
1250 | void *dt; | |
1251 | ||
1252 | if (!initial_boot_params) { | |
1253 | pr_warn("No valid device tree found, continuing without\n"); | |
1254 | return; | |
1255 | } | |
1256 | ||
c972de14 | 1257 | size = fdt_totalsize(initial_boot_params); |
6f041e99 | 1258 | dt = early_init_dt_alloc_memory_arch(size, |
c972de14 | 1259 | roundup_pow_of_two(FDT_V17_SIZE)); |
a8bf7527 RH |
1260 | |
1261 | if (dt) { | |
1262 | memcpy(dt, initial_boot_params, size); | |
1263 | initial_boot_params = dt; | |
1264 | } | |
1265 | unflatten_device_tree(); | |
1266 | } | |
1267 | ||
08d53aa5 AB |
1268 | #ifdef CONFIG_SYSFS |
1269 | static ssize_t of_fdt_raw_read(struct file *filp, struct kobject *kobj, | |
1270 | struct bin_attribute *bin_attr, | |
1271 | char *buf, loff_t off, size_t count) | |
b0a6fb36 | 1272 | { |
08d53aa5 AB |
1273 | memcpy(buf, initial_boot_params + off, count); |
1274 | return count; | |
1275 | } | |
b0a6fb36 | 1276 | |
08d53aa5 AB |
1277 | static int __init of_fdt_raw_init(void) |
1278 | { | |
1279 | static struct bin_attribute of_fdt_raw_attr = | |
1280 | __BIN_ATTR(fdt, S_IRUSR, of_fdt_raw_read, NULL, 0); | |
b0a6fb36 | 1281 | |
08d53aa5 AB |
1282 | if (!initial_boot_params) |
1283 | return 0; | |
b0a6fb36 | 1284 | |
08d53aa5 AB |
1285 | if (of_fdt_crc32 != crc32_be(~0, initial_boot_params, |
1286 | fdt_totalsize(initial_boot_params))) { | |
606ad42a | 1287 | pr_warn("not creating '/sys/firmware/fdt': CRC check failed\n"); |
08d53aa5 AB |
1288 | return 0; |
1289 | } | |
1290 | of_fdt_raw_attr.size = fdt_totalsize(initial_boot_params); | |
1291 | return sysfs_create_bin_file(firmware_kobj, &of_fdt_raw_attr); | |
b0a6fb36 | 1292 | } |
08d53aa5 | 1293 | late_initcall(of_fdt_raw_init); |
b0a6fb36 RH |
1294 | #endif |
1295 | ||
e6ce1324 | 1296 | #endif /* CONFIG_OF_EARLY_FLATTREE */ |