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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 | */ | |
9b4d2b63 | 41 | void __init of_fdt_limit_memory(int limit) |
704033ce LA |
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 | ||
ecc8a96e RH |
81 | static bool of_fdt_device_is_available(const void *blob, unsigned long node) |
82 | { | |
83 | const char *status = fdt_getprop(blob, node, "status", NULL); | |
84 | ||
85 | if (!status) | |
86 | return true; | |
87 | ||
88 | if (!strcmp(status, "ok") || !strcmp(status, "okay")) | |
89 | return true; | |
90 | ||
91 | return false; | |
92 | } | |
93 | ||
44856819 | 94 | static void *unflatten_dt_alloc(void **mem, unsigned long size, |
bbd33931 GL |
95 | unsigned long align) |
96 | { | |
97 | void *res; | |
98 | ||
44856819 GL |
99 | *mem = PTR_ALIGN(*mem, align); |
100 | res = *mem; | |
bbd33931 GL |
101 | *mem += size; |
102 | ||
103 | return res; | |
104 | } | |
105 | ||
dfbd4c6e GS |
106 | static void populate_properties(const void *blob, |
107 | int offset, | |
108 | void **mem, | |
109 | struct device_node *np, | |
110 | const char *nodename, | |
5063e25a | 111 | bool dryrun) |
bbd33931 | 112 | { |
dfbd4c6e GS |
113 | struct property *pp, **pprev = NULL; |
114 | int cur; | |
115 | bool has_name = false; | |
116 | ||
117 | pprev = &np->properties; | |
118 | for (cur = fdt_first_property_offset(blob, offset); | |
119 | cur >= 0; | |
120 | cur = fdt_next_property_offset(blob, cur)) { | |
121 | const __be32 *val; | |
122 | const char *pname; | |
123 | u32 sz; | |
124 | ||
125 | val = fdt_getprop_by_offset(blob, cur, &pname, &sz); | |
126 | if (!val) { | |
606ad42a | 127 | pr_warn("Cannot locate property at 0x%x\n", cur); |
dfbd4c6e GS |
128 | continue; |
129 | } | |
130 | ||
131 | if (!pname) { | |
606ad42a | 132 | pr_warn("Cannot find property name at 0x%x\n", cur); |
dfbd4c6e GS |
133 | continue; |
134 | } | |
135 | ||
136 | if (!strcmp(pname, "name")) | |
137 | has_name = true; | |
138 | ||
139 | pp = unflatten_dt_alloc(mem, sizeof(struct property), | |
140 | __alignof__(struct property)); | |
141 | if (dryrun) | |
142 | continue; | |
143 | ||
144 | /* We accept flattened tree phandles either in | |
145 | * ePAPR-style "phandle" properties, or the | |
146 | * legacy "linux,phandle" properties. If both | |
147 | * appear and have different values, things | |
148 | * will get weird. Don't do that. | |
149 | */ | |
150 | if (!strcmp(pname, "phandle") || | |
151 | !strcmp(pname, "linux,phandle")) { | |
152 | if (!np->phandle) | |
153 | np->phandle = be32_to_cpup(val); | |
154 | } | |
155 | ||
156 | /* And we process the "ibm,phandle" property | |
157 | * used in pSeries dynamic device tree | |
158 | * stuff | |
159 | */ | |
160 | if (!strcmp(pname, "ibm,phandle")) | |
161 | np->phandle = be32_to_cpup(val); | |
162 | ||
163 | pp->name = (char *)pname; | |
164 | pp->length = sz; | |
165 | pp->value = (__be32 *)val; | |
166 | *pprev = pp; | |
167 | pprev = &pp->next; | |
168 | } | |
169 | ||
170 | /* With version 0x10 we may not have the name property, | |
171 | * recreate it here from the unit name if absent | |
172 | */ | |
173 | if (!has_name) { | |
174 | const char *p = nodename, *ps = p, *pa = NULL; | |
175 | int len; | |
176 | ||
177 | while (*p) { | |
178 | if ((*p) == '@') | |
179 | pa = p; | |
180 | else if ((*p) == '/') | |
181 | ps = p + 1; | |
182 | p++; | |
183 | } | |
184 | ||
185 | if (pa < ps) | |
186 | pa = p; | |
187 | len = (pa - ps) + 1; | |
188 | pp = unflatten_dt_alloc(mem, sizeof(struct property) + len, | |
189 | __alignof__(struct property)); | |
190 | if (!dryrun) { | |
191 | pp->name = "name"; | |
192 | pp->length = len; | |
193 | pp->value = pp + 1; | |
194 | *pprev = pp; | |
195 | pprev = &pp->next; | |
196 | memcpy(pp->value, ps, len - 1); | |
197 | ((char *)pp->value)[len - 1] = 0; | |
198 | pr_debug("fixed up name for %s -> %s\n", | |
199 | nodename, (char *)pp->value); | |
200 | } | |
201 | } | |
202 | ||
203 | if (!dryrun) | |
204 | *pprev = NULL; | |
205 | } | |
206 | ||
a7e4cfb0 RH |
207 | static bool populate_node(const void *blob, |
208 | int offset, | |
209 | void **mem, | |
210 | struct device_node *dad, | |
211 | struct device_node **pnp, | |
212 | bool dryrun) | |
dfbd4c6e | 213 | { |
bbd33931 | 214 | struct device_node *np; |
e6a6928c | 215 | const char *pathp; |
bbd33931 | 216 | unsigned int l, allocl; |
bbd33931 | 217 | |
dfbd4c6e GS |
218 | pathp = fdt_get_name(blob, offset, &l); |
219 | if (!pathp) { | |
220 | *pnp = NULL; | |
a7e4cfb0 | 221 | return false; |
dfbd4c6e | 222 | } |
e6a6928c | 223 | |
05f4647b | 224 | allocl = ++l; |
bbd33931 | 225 | |
dfbd4c6e | 226 | np = unflatten_dt_alloc(mem, sizeof(struct device_node) + allocl, |
bbd33931 | 227 | __alignof__(struct device_node)); |
5063e25a | 228 | if (!dryrun) { |
c22618a1 | 229 | char *fn; |
0829f6d1 | 230 | of_node_init(np); |
c22618a1 | 231 | np->full_name = fn = ((char *)np) + sizeof(*np); |
a7e4cfb0 | 232 | |
c22618a1 GL |
233 | memcpy(fn, pathp, l); |
234 | ||
bbd33931 GL |
235 | if (dad != NULL) { |
236 | np->parent = dad; | |
70161ff3 GL |
237 | np->sibling = dad->child; |
238 | dad->child = np; | |
bbd33931 | 239 | } |
bbd33931 | 240 | } |
e6a6928c | 241 | |
dfbd4c6e | 242 | populate_properties(blob, offset, mem, np, pathp, dryrun); |
5063e25a | 243 | if (!dryrun) { |
bbd33931 | 244 | np->name = of_get_property(np, "name", NULL); |
bbd33931 GL |
245 | if (!np->name) |
246 | np->name = "<NULL>"; | |
bbd33931 | 247 | } |
e6a6928c | 248 | |
dfbd4c6e | 249 | *pnp = np; |
a7e4cfb0 | 250 | return true; |
dfbd4c6e GS |
251 | } |
252 | ||
50800082 GS |
253 | static void reverse_nodes(struct device_node *parent) |
254 | { | |
255 | struct device_node *child, *next; | |
256 | ||
257 | /* In-depth first */ | |
258 | child = parent->child; | |
259 | while (child) { | |
260 | reverse_nodes(child); | |
261 | ||
262 | child = child->sibling; | |
263 | } | |
264 | ||
265 | /* Reverse the nodes in the child list */ | |
266 | child = parent->child; | |
267 | parent->child = NULL; | |
268 | while (child) { | |
269 | next = child->sibling; | |
270 | ||
271 | child->sibling = parent->child; | |
272 | parent->child = child; | |
273 | child = next; | |
274 | } | |
275 | } | |
276 | ||
dfbd4c6e | 277 | /** |
947c82cb | 278 | * unflatten_dt_nodes - Alloc and populate a device_node from the flat tree |
dfbd4c6e GS |
279 | * @blob: The parent device tree blob |
280 | * @mem: Memory chunk to use for allocating device nodes and properties | |
dfbd4c6e GS |
281 | * @dad: Parent struct device_node |
282 | * @nodepp: The device_node tree created by the call | |
50800082 GS |
283 | * |
284 | * It returns the size of unflattened device tree or error code | |
dfbd4c6e | 285 | */ |
947c82cb GS |
286 | static int unflatten_dt_nodes(const void *blob, |
287 | void *mem, | |
288 | struct device_node *dad, | |
289 | struct device_node **nodepp) | |
dfbd4c6e | 290 | { |
50800082 | 291 | struct device_node *root; |
8c237cd0 | 292 | int offset = 0, depth = 0, initial_depth = 0; |
50800082 | 293 | #define FDT_MAX_DEPTH 64 |
50800082 GS |
294 | struct device_node *nps[FDT_MAX_DEPTH]; |
295 | void *base = mem; | |
296 | bool dryrun = !base; | |
dfbd4c6e | 297 | |
50800082 GS |
298 | if (nodepp) |
299 | *nodepp = NULL; | |
300 | ||
8c237cd0 GS |
301 | /* |
302 | * We're unflattening device sub-tree if @dad is valid. There are | |
303 | * possibly multiple nodes in the first level of depth. We need | |
304 | * set @depth to 1 to make fdt_next_node() happy as it bails | |
305 | * immediately when negative @depth is found. Otherwise, the device | |
306 | * nodes except the first one won't be unflattened successfully. | |
307 | */ | |
308 | if (dad) | |
309 | depth = initial_depth = 1; | |
310 | ||
50800082 | 311 | root = dad; |
78c44d91 | 312 | nps[depth] = dad; |
8c237cd0 | 313 | |
50800082 | 314 | for (offset = 0; |
8c237cd0 | 315 | offset >= 0 && depth >= initial_depth; |
50800082 GS |
316 | offset = fdt_next_node(blob, offset, &depth)) { |
317 | if (WARN_ON_ONCE(depth >= FDT_MAX_DEPTH)) | |
318 | continue; | |
dfbd4c6e | 319 | |
77ea8a68 RH |
320 | if (!IS_ENABLED(CONFIG_OF_KOBJ) && |
321 | !of_fdt_device_is_available(blob, offset)) | |
322 | continue; | |
323 | ||
a7e4cfb0 RH |
324 | if (!populate_node(blob, offset, &mem, nps[depth], |
325 | &nps[depth+1], dryrun)) | |
50800082 GS |
326 | return mem - base; |
327 | ||
328 | if (!dryrun && nodepp && !*nodepp) | |
78c44d91 | 329 | *nodepp = nps[depth+1]; |
50800082 | 330 | if (!dryrun && !root) |
78c44d91 | 331 | root = nps[depth+1]; |
50800082 | 332 | } |
e6a6928c | 333 | |
50800082 | 334 | if (offset < 0 && offset != -FDT_ERR_NOTFOUND) { |
606ad42a | 335 | pr_err("Error %d processing FDT\n", offset); |
50800082 GS |
336 | return -EINVAL; |
337 | } | |
e6a6928c | 338 | |
70161ff3 GL |
339 | /* |
340 | * Reverse the child list. Some drivers assumes node order matches .dts | |
341 | * node order | |
342 | */ | |
50800082 GS |
343 | if (!dryrun) |
344 | reverse_nodes(root); | |
e6a6928c | 345 | |
50800082 | 346 | return mem - base; |
bbd33931 | 347 | } |
41f88009 | 348 | |
fe140423 SN |
349 | /** |
350 | * __unflatten_device_tree - create tree of device_nodes from flat blob | |
351 | * | |
352 | * unflattens a device-tree, creating the | |
353 | * tree of struct device_node. It also fills the "name" and "type" | |
354 | * pointers of the nodes so the normal device-tree walking functions | |
355 | * can be used. | |
356 | * @blob: The blob to expand | |
c4263233 | 357 | * @dad: Parent device node |
fe140423 SN |
358 | * @mynodes: The device_node tree created by the call |
359 | * @dt_alloc: An allocator that provides a virtual address to memory | |
360 | * for the resulting tree | |
f5d2da67 | 361 | * @detached: if true set OF_DETACHED on @mynodes |
83262418 GS |
362 | * |
363 | * Returns NULL on failure or the memory chunk containing the unflattened | |
364 | * device tree on success. | |
fe140423 | 365 | */ |
81d0848f FR |
366 | void *__unflatten_device_tree(const void *blob, |
367 | struct device_node *dad, | |
368 | struct device_node **mynodes, | |
369 | void *(*dt_alloc)(u64 size, u64 align), | |
370 | bool detached) | |
fe140423 | 371 | { |
50800082 | 372 | int size; |
e6a6928c | 373 | void *mem; |
fe140423 SN |
374 | |
375 | pr_debug(" -> unflatten_device_tree()\n"); | |
376 | ||
377 | if (!blob) { | |
378 | pr_debug("No device tree pointer\n"); | |
83262418 | 379 | return NULL; |
fe140423 SN |
380 | } |
381 | ||
382 | pr_debug("Unflattening device tree:\n"); | |
c972de14 RH |
383 | pr_debug("magic: %08x\n", fdt_magic(blob)); |
384 | pr_debug("size: %08x\n", fdt_totalsize(blob)); | |
385 | pr_debug("version: %08x\n", fdt_version(blob)); | |
fe140423 | 386 | |
c972de14 | 387 | if (fdt_check_header(blob)) { |
fe140423 | 388 | pr_err("Invalid device tree blob header\n"); |
83262418 | 389 | return NULL; |
fe140423 SN |
390 | } |
391 | ||
392 | /* First pass, scan for size */ | |
c4263233 | 393 | size = unflatten_dt_nodes(blob, NULL, dad, NULL); |
50800082 | 394 | if (size < 0) |
83262418 | 395 | return NULL; |
fe140423 | 396 | |
50800082 GS |
397 | size = ALIGN(size, 4); |
398 | pr_debug(" size is %d, allocating...\n", size); | |
fe140423 SN |
399 | |
400 | /* Allocate memory for the expanded device tree */ | |
44856819 | 401 | mem = dt_alloc(size + 4, __alignof__(struct device_node)); |
49e67dd1 JH |
402 | if (!mem) |
403 | return NULL; | |
404 | ||
44856819 | 405 | memset(mem, 0, size); |
fe140423 | 406 | |
44856819 | 407 | *(__be32 *)(mem + size) = cpu_to_be32(0xdeadbeef); |
9e401275 | 408 | |
44856819 | 409 | pr_debug(" unflattening %p...\n", mem); |
fe140423 SN |
410 | |
411 | /* Second pass, do actual unflattening */ | |
c4263233 | 412 | unflatten_dt_nodes(blob, mem, dad, mynodes); |
44856819 | 413 | if (be32_to_cpup(mem + size) != 0xdeadbeef) |
fe140423 | 414 | pr_warning("End of tree marker overwritten: %08x\n", |
44856819 | 415 | be32_to_cpup(mem + size)); |
fe140423 | 416 | |
89c67752 | 417 | if (detached && mynodes) { |
1d1bde55 MS |
418 | of_node_set_flag(*mynodes, OF_DETACHED); |
419 | pr_debug("unflattened tree is detached\n"); | |
420 | } | |
421 | ||
fe140423 | 422 | pr_debug(" <- unflatten_device_tree()\n"); |
83262418 | 423 | return mem; |
fe140423 SN |
424 | } |
425 | ||
426 | static void *kernel_tree_alloc(u64 size, u64 align) | |
427 | { | |
428 | return kzalloc(size, GFP_KERNEL); | |
429 | } | |
430 | ||
f8062386 GR |
431 | static DEFINE_MUTEX(of_fdt_unflatten_mutex); |
432 | ||
fe140423 SN |
433 | /** |
434 | * of_fdt_unflatten_tree - create tree of device_nodes from flat blob | |
c4263233 GS |
435 | * @blob: Flat device tree blob |
436 | * @dad: Parent device node | |
437 | * @mynodes: The device tree created by the call | |
fe140423 SN |
438 | * |
439 | * unflattens the device-tree passed by the firmware, creating the | |
440 | * tree of struct device_node. It also fills the "name" and "type" | |
441 | * pointers of the nodes so the normal device-tree walking functions | |
442 | * can be used. | |
83262418 GS |
443 | * |
444 | * Returns NULL on failure or the memory chunk containing the unflattened | |
445 | * device tree on success. | |
fe140423 | 446 | */ |
83262418 GS |
447 | void *of_fdt_unflatten_tree(const unsigned long *blob, |
448 | struct device_node *dad, | |
449 | struct device_node **mynodes) | |
fe140423 | 450 | { |
83262418 GS |
451 | void *mem; |
452 | ||
f8062386 | 453 | mutex_lock(&of_fdt_unflatten_mutex); |
1d1bde55 MS |
454 | mem = __unflatten_device_tree(blob, dad, mynodes, &kernel_tree_alloc, |
455 | true); | |
f8062386 | 456 | mutex_unlock(&of_fdt_unflatten_mutex); |
83262418 GS |
457 | |
458 | return mem; | |
fe140423 SN |
459 | } |
460 | EXPORT_SYMBOL_GPL(of_fdt_unflatten_tree); | |
461 | ||
57d00ecf SN |
462 | /* Everything below here references initial_boot_params directly. */ |
463 | int __initdata dt_root_addr_cells; | |
464 | int __initdata dt_root_size_cells; | |
465 | ||
7c71650f | 466 | void *initial_boot_params __ro_after_init; |
57d00ecf SN |
467 | |
468 | #ifdef CONFIG_OF_EARLY_FLATTREE | |
469 | ||
08d53aa5 AB |
470 | static u32 of_fdt_crc32; |
471 | ||
e8d9d1f5 MS |
472 | /** |
473 | * res_mem_reserve_reg() - reserve all memory described in 'reg' property | |
474 | */ | |
475 | static int __init __reserved_mem_reserve_reg(unsigned long node, | |
476 | const char *uname) | |
477 | { | |
478 | int t_len = (dt_root_addr_cells + dt_root_size_cells) * sizeof(__be32); | |
479 | phys_addr_t base, size; | |
9d0c4dfe RH |
480 | int len; |
481 | const __be32 *prop; | |
3f0c8206 | 482 | int nomap, first = 1; |
e8d9d1f5 MS |
483 | |
484 | prop = of_get_flat_dt_prop(node, "reg", &len); | |
485 | if (!prop) | |
486 | return -ENOENT; | |
487 | ||
488 | if (len && len % t_len != 0) { | |
489 | pr_err("Reserved memory: invalid reg property in '%s', skipping node.\n", | |
490 | uname); | |
491 | return -EINVAL; | |
492 | } | |
493 | ||
494 | nomap = of_get_flat_dt_prop(node, "no-map", NULL) != NULL; | |
495 | ||
496 | while (len >= t_len) { | |
497 | base = dt_mem_next_cell(dt_root_addr_cells, &prop); | |
498 | size = dt_mem_next_cell(dt_root_size_cells, &prop); | |
499 | ||
b5f2a8c0 | 500 | if (size && |
e8d9d1f5 MS |
501 | early_init_dt_reserve_memory_arch(base, size, nomap) == 0) |
502 | pr_debug("Reserved memory: reserved region for node '%s': base %pa, size %ld MiB\n", | |
503 | uname, &base, (unsigned long)size / SZ_1M); | |
504 | else | |
505 | pr_info("Reserved memory: failed to reserve memory for node '%s': base %pa, size %ld MiB\n", | |
506 | uname, &base, (unsigned long)size / SZ_1M); | |
507 | ||
508 | len -= t_len; | |
3f0c8206 MS |
509 | if (first) { |
510 | fdt_reserved_mem_save_node(node, uname, base, size); | |
511 | first = 0; | |
512 | } | |
e8d9d1f5 MS |
513 | } |
514 | return 0; | |
515 | } | |
516 | ||
517 | /** | |
518 | * __reserved_mem_check_root() - check if #size-cells, #address-cells provided | |
519 | * in /reserved-memory matches the values supported by the current implementation, | |
520 | * also check if ranges property has been provided | |
521 | */ | |
5b624118 | 522 | static int __init __reserved_mem_check_root(unsigned long node) |
e8d9d1f5 | 523 | { |
9d0c4dfe | 524 | const __be32 *prop; |
e8d9d1f5 MS |
525 | |
526 | prop = of_get_flat_dt_prop(node, "#size-cells", NULL); | |
527 | if (!prop || be32_to_cpup(prop) != dt_root_size_cells) | |
528 | return -EINVAL; | |
529 | ||
530 | prop = of_get_flat_dt_prop(node, "#address-cells", NULL); | |
531 | if (!prop || be32_to_cpup(prop) != dt_root_addr_cells) | |
532 | return -EINVAL; | |
533 | ||
534 | prop = of_get_flat_dt_prop(node, "ranges", NULL); | |
535 | if (!prop) | |
536 | return -EINVAL; | |
537 | return 0; | |
538 | } | |
539 | ||
540 | /** | |
541 | * fdt_scan_reserved_mem() - scan a single FDT node for reserved memory | |
542 | */ | |
543 | static int __init __fdt_scan_reserved_mem(unsigned long node, const char *uname, | |
544 | int depth, void *data) | |
545 | { | |
546 | static int found; | |
3f0c8206 | 547 | int err; |
e8d9d1f5 MS |
548 | |
549 | if (!found && depth == 1 && strcmp(uname, "reserved-memory") == 0) { | |
550 | if (__reserved_mem_check_root(node) != 0) { | |
551 | pr_err("Reserved memory: unsupported node format, ignoring\n"); | |
552 | /* break scan */ | |
553 | return 1; | |
554 | } | |
555 | found = 1; | |
556 | /* scan next node */ | |
557 | return 0; | |
558 | } else if (!found) { | |
559 | /* scan next node */ | |
560 | return 0; | |
561 | } else if (found && depth < 2) { | |
562 | /* scanning of /reserved-memory has been finished */ | |
563 | return 1; | |
564 | } | |
565 | ||
ecc8a96e | 566 | if (!of_fdt_device_is_available(initial_boot_params, node)) |
e8d9d1f5 MS |
567 | return 0; |
568 | ||
3f0c8206 MS |
569 | err = __reserved_mem_reserve_reg(node, uname); |
570 | if (err == -ENOENT && of_get_flat_dt_prop(node, "size", NULL)) | |
571 | fdt_reserved_mem_save_node(node, uname, 0, 0); | |
e8d9d1f5 MS |
572 | |
573 | /* scan next node */ | |
574 | return 0; | |
575 | } | |
576 | ||
577 | /** | |
578 | * early_init_fdt_scan_reserved_mem() - create reserved memory regions | |
579 | * | |
580 | * This function grabs memory from early allocator for device exclusive use | |
581 | * defined in device tree structures. It should be called by arch specific code | |
582 | * once the early allocator (i.e. memblock) has been fully activated. | |
583 | */ | |
584 | void __init early_init_fdt_scan_reserved_mem(void) | |
585 | { | |
d1552ce4 RH |
586 | int n; |
587 | u64 base, size; | |
588 | ||
2040b527 JC |
589 | if (!initial_boot_params) |
590 | return; | |
591 | ||
d1552ce4 RH |
592 | /* Process header /memreserve/ fields */ |
593 | for (n = 0; ; n++) { | |
594 | fdt_get_mem_rsv(initial_boot_params, n, &base, &size); | |
595 | if (!size) | |
596 | break; | |
597 | early_init_dt_reserve_memory_arch(base, size, 0); | |
598 | } | |
599 | ||
e8d9d1f5 | 600 | of_scan_flat_dt(__fdt_scan_reserved_mem, NULL); |
3f0c8206 | 601 | fdt_init_reserved_mem(); |
e8d9d1f5 MS |
602 | } |
603 | ||
24bbd929 AB |
604 | /** |
605 | * early_init_fdt_reserve_self() - reserve the memory used by the FDT blob | |
606 | */ | |
607 | void __init early_init_fdt_reserve_self(void) | |
608 | { | |
609 | if (!initial_boot_params) | |
610 | return; | |
611 | ||
612 | /* Reserve the dtb region */ | |
613 | early_init_dt_reserve_memory_arch(__pa(initial_boot_params), | |
614 | fdt_totalsize(initial_boot_params), | |
615 | 0); | |
616 | } | |
617 | ||
57d00ecf SN |
618 | /** |
619 | * of_scan_flat_dt - scan flattened tree blob and call callback on each. | |
620 | * @it: callback function | |
621 | * @data: context data pointer | |
622 | * | |
623 | * This function is used to scan the flattened device-tree, it is | |
624 | * used to extract the memory information at boot before we can | |
625 | * unflatten the tree | |
626 | */ | |
627 | int __init of_scan_flat_dt(int (*it)(unsigned long node, | |
628 | const char *uname, int depth, | |
629 | void *data), | |
630 | void *data) | |
631 | { | |
e6a6928c RH |
632 | const void *blob = initial_boot_params; |
633 | const char *pathp; | |
634 | int offset, rc = 0, depth = -1; | |
635 | ||
3ec75441 TW |
636 | if (!blob) |
637 | return 0; | |
638 | ||
639 | for (offset = fdt_next_node(blob, -1, &depth); | |
640 | offset >= 0 && depth >= 0 && !rc; | |
641 | offset = fdt_next_node(blob, offset, &depth)) { | |
e6a6928c RH |
642 | |
643 | pathp = fdt_get_name(blob, offset, NULL); | |
375da3a7 AS |
644 | if (*pathp == '/') |
645 | pathp = kbasename(pathp); | |
e6a6928c RH |
646 | rc = it(offset, pathp, depth, data); |
647 | } | |
57d00ecf SN |
648 | return rc; |
649 | } | |
650 | ||
ea47dd19 NP |
651 | /** |
652 | * of_scan_flat_dt_subnodes - scan sub-nodes of a node call callback on each. | |
653 | * @it: callback function | |
654 | * @data: context data pointer | |
655 | * | |
656 | * This function is used to scan sub-nodes of a node. | |
657 | */ | |
658 | int __init of_scan_flat_dt_subnodes(unsigned long parent, | |
659 | int (*it)(unsigned long node, | |
660 | const char *uname, | |
661 | void *data), | |
662 | void *data) | |
663 | { | |
664 | const void *blob = initial_boot_params; | |
665 | int node; | |
666 | ||
667 | fdt_for_each_subnode(node, blob, parent) { | |
668 | const char *pathp; | |
669 | int rc; | |
670 | ||
671 | pathp = fdt_get_name(blob, node, NULL); | |
672 | if (*pathp == '/') | |
673 | pathp = kbasename(pathp); | |
674 | rc = it(node, pathp, data); | |
675 | if (rc) | |
676 | return rc; | |
677 | } | |
678 | return 0; | |
679 | } | |
680 | ||
9c609868 SZ |
681 | /** |
682 | * of_get_flat_dt_subnode_by_name - get the subnode by given name | |
683 | * | |
684 | * @node: the parent node | |
685 | * @uname: the name of subnode | |
686 | * @return offset of the subnode, or -FDT_ERR_NOTFOUND if there is none | |
687 | */ | |
688 | ||
9b4d2b63 | 689 | int __init of_get_flat_dt_subnode_by_name(unsigned long node, const char *uname) |
9c609868 SZ |
690 | { |
691 | return fdt_subnode_offset(initial_boot_params, node, uname); | |
692 | } | |
693 | ||
57d00ecf SN |
694 | /** |
695 | * of_get_flat_dt_root - find the root node in the flat blob | |
696 | */ | |
697 | unsigned long __init of_get_flat_dt_root(void) | |
698 | { | |
e6a6928c | 699 | return 0; |
57d00ecf SN |
700 | } |
701 | ||
702 | /** | |
703 | * of_get_flat_dt_prop - Given a node in the flat blob, return the property ptr | |
704 | * | |
705 | * This function can be used within scan_flattened_dt callback to get | |
706 | * access to properties | |
707 | */ | |
9d0c4dfe RH |
708 | const void *__init of_get_flat_dt_prop(unsigned long node, const char *name, |
709 | int *size) | |
57d00ecf | 710 | { |
e6a6928c | 711 | return fdt_getprop(initial_boot_params, node, name, size); |
57d00ecf SN |
712 | } |
713 | ||
5d9c4e95 KW |
714 | /** |
715 | * of_fdt_is_compatible - Return true if given node from the given blob has | |
716 | * compat in its compatible list | |
717 | * @blob: A device tree blob | |
718 | * @node: node to test | |
719 | * @compat: compatible string to compare with compatible list. | |
720 | * | |
721 | * On match, returns a non-zero value with smaller values returned for more | |
722 | * specific compatible values. | |
723 | */ | |
724 | static int of_fdt_is_compatible(const void *blob, | |
725 | unsigned long node, const char *compat) | |
726 | { | |
727 | const char *cp; | |
728 | int cplen; | |
729 | unsigned long l, score = 0; | |
730 | ||
731 | cp = fdt_getprop(blob, node, "compatible", &cplen); | |
732 | if (cp == NULL) | |
733 | return 0; | |
734 | while (cplen > 0) { | |
735 | score++; | |
736 | if (of_compat_cmp(cp, compat, strlen(compat)) == 0) | |
737 | return score; | |
738 | l = strlen(cp) + 1; | |
739 | cp += l; | |
740 | cplen -= l; | |
741 | } | |
742 | ||
743 | return 0; | |
744 | } | |
745 | ||
57d00ecf SN |
746 | /** |
747 | * of_flat_dt_is_compatible - Return true if given node has compat in compatible list | |
748 | * @node: node to test | |
749 | * @compat: compatible string to compare with compatible list. | |
750 | */ | |
751 | int __init of_flat_dt_is_compatible(unsigned long node, const char *compat) | |
752 | { | |
753 | return of_fdt_is_compatible(initial_boot_params, node, compat); | |
754 | } | |
755 | ||
a4f740cf GL |
756 | /** |
757 | * of_flat_dt_match - Return true if node matches a list of compatible values | |
758 | */ | |
9b4d2b63 | 759 | static int __init of_flat_dt_match(unsigned long node, const char *const *compat) |
a4f740cf | 760 | { |
5d9c4e95 KW |
761 | unsigned int tmp, score = 0; |
762 | ||
763 | if (!compat) | |
764 | return 0; | |
765 | ||
766 | while (*compat) { | |
767 | tmp = of_fdt_is_compatible(initial_boot_params, node, *compat); | |
768 | if (tmp && (score == 0 || (tmp < score))) | |
769 | score = tmp; | |
770 | compat++; | |
771 | } | |
772 | ||
773 | return score; | |
a4f740cf GL |
774 | } |
775 | ||
ea47dd19 NP |
776 | /** |
777 | * of_get_flat_dt_prop - Given a node in the flat blob, return the phandle | |
778 | */ | |
779 | uint32_t __init of_get_flat_dt_phandle(unsigned long node) | |
780 | { | |
781 | return fdt_get_phandle(initial_boot_params, node); | |
782 | } | |
783 | ||
57d74bcf MS |
784 | struct fdt_scan_status { |
785 | const char *name; | |
786 | int namelen; | |
787 | int depth; | |
788 | int found; | |
789 | int (*iterator)(unsigned long node, const char *uname, int depth, void *data); | |
790 | void *data; | |
791 | }; | |
792 | ||
6a903a25 RH |
793 | const char * __init of_flat_dt_get_machine_name(void) |
794 | { | |
795 | const char *name; | |
796 | unsigned long dt_root = of_get_flat_dt_root(); | |
797 | ||
798 | name = of_get_flat_dt_prop(dt_root, "model", NULL); | |
799 | if (!name) | |
800 | name = of_get_flat_dt_prop(dt_root, "compatible", NULL); | |
801 | return name; | |
802 | } | |
803 | ||
804 | /** | |
805 | * of_flat_dt_match_machine - Iterate match tables to find matching machine. | |
806 | * | |
807 | * @default_match: A machine specific ptr to return in case of no match. | |
808 | * @get_next_compat: callback function to return next compatible match table. | |
809 | * | |
810 | * Iterate through machine match tables to find the best match for the machine | |
811 | * compatible string in the FDT. | |
812 | */ | |
813 | const void * __init of_flat_dt_match_machine(const void *default_match, | |
814 | const void * (*get_next_compat)(const char * const**)) | |
815 | { | |
816 | const void *data = NULL; | |
817 | const void *best_data = default_match; | |
818 | const char *const *compat; | |
819 | unsigned long dt_root; | |
820 | unsigned int best_score = ~1, score = 0; | |
821 | ||
822 | dt_root = of_get_flat_dt_root(); | |
823 | while ((data = get_next_compat(&compat))) { | |
824 | score = of_flat_dt_match(dt_root, compat); | |
825 | if (score > 0 && score < best_score) { | |
826 | best_data = data; | |
827 | best_score = score; | |
828 | } | |
829 | } | |
830 | if (!best_data) { | |
831 | const char *prop; | |
9d0c4dfe | 832 | int size; |
6a903a25 RH |
833 | |
834 | pr_err("\n unrecognized device tree list:\n[ "); | |
835 | ||
836 | prop = of_get_flat_dt_prop(dt_root, "compatible", &size); | |
837 | if (prop) { | |
838 | while (size > 0) { | |
839 | printk("'%s' ", prop); | |
840 | size -= strlen(prop) + 1; | |
841 | prop += strlen(prop) + 1; | |
842 | } | |
843 | } | |
844 | printk("]\n\n"); | |
845 | return NULL; | |
846 | } | |
847 | ||
848 | pr_info("Machine model: %s\n", of_flat_dt_get_machine_name()); | |
849 | ||
850 | return best_data; | |
851 | } | |
852 | ||
f7b3a835 | 853 | #ifdef CONFIG_BLK_DEV_INITRD |
369bc9ab AB |
854 | static void __early_init_dt_declare_initrd(unsigned long start, |
855 | unsigned long end) | |
856 | { | |
cdbc848b FF |
857 | /* ARM64 would cause a BUG to occur here when CONFIG_DEBUG_VM is |
858 | * enabled since __va() is called too early. ARM64 does make use | |
859 | * of phys_initrd_start/phys_initrd_size so we can skip this | |
860 | * conversion. | |
861 | */ | |
862 | if (!IS_ENABLED(CONFIG_ARM64)) { | |
863 | initrd_start = (unsigned long)__va(start); | |
864 | initrd_end = (unsigned long)__va(end); | |
865 | initrd_below_start_ok = 1; | |
866 | } | |
369bc9ab | 867 | } |
369bc9ab | 868 | |
f7b3a835 GL |
869 | /** |
870 | * early_init_dt_check_for_initrd - Decode initrd location from flat tree | |
871 | * @node: reference to node containing initrd location ('chosen') | |
872 | */ | |
29eb45a9 | 873 | static void __init early_init_dt_check_for_initrd(unsigned long node) |
f7b3a835 | 874 | { |
374d5c99 | 875 | u64 start, end; |
9d0c4dfe RH |
876 | int len; |
877 | const __be32 *prop; | |
f7b3a835 GL |
878 | |
879 | pr_debug("Looking for initrd properties... "); | |
880 | ||
881 | prop = of_get_flat_dt_prop(node, "linux,initrd-start", &len); | |
1406bc2f JK |
882 | if (!prop) |
883 | return; | |
374d5c99 | 884 | start = of_read_number(prop, len/4); |
1406bc2f JK |
885 | |
886 | prop = of_get_flat_dt_prop(node, "linux,initrd-end", &len); | |
887 | if (!prop) | |
888 | return; | |
374d5c99 | 889 | end = of_read_number(prop, len/4); |
f7b3a835 | 890 | |
369bc9ab | 891 | __early_init_dt_declare_initrd(start, end); |
fe7db757 FF |
892 | phys_initrd_start = start; |
893 | phys_initrd_size = end - start; | |
29eb45a9 | 894 | |
374d5c99 SS |
895 | pr_debug("initrd_start=0x%llx initrd_end=0x%llx\n", |
896 | (unsigned long long)start, (unsigned long long)end); | |
f7b3a835 GL |
897 | } |
898 | #else | |
29eb45a9 | 899 | static inline void early_init_dt_check_for_initrd(unsigned long node) |
f7b3a835 GL |
900 | { |
901 | } | |
902 | #endif /* CONFIG_BLK_DEV_INITRD */ | |
903 | ||
fb11ffe7 | 904 | #ifdef CONFIG_SERIAL_EARLYCON |
fb11ffe7 | 905 | |
d503187b | 906 | int __init early_init_dt_scan_chosen_stdout(void) |
fb11ffe7 RH |
907 | { |
908 | int offset; | |
4d118c9a | 909 | const char *p, *q, *options = NULL; |
fb11ffe7 | 910 | int l; |
dd709e72 | 911 | const struct earlycon_id **p_match; |
fb11ffe7 RH |
912 | const void *fdt = initial_boot_params; |
913 | ||
914 | offset = fdt_path_offset(fdt, "/chosen"); | |
915 | if (offset < 0) | |
916 | offset = fdt_path_offset(fdt, "/chosen@0"); | |
917 | if (offset < 0) | |
918 | return -ENOENT; | |
919 | ||
920 | p = fdt_getprop(fdt, offset, "stdout-path", &l); | |
921 | if (!p) | |
922 | p = fdt_getprop(fdt, offset, "linux,stdout-path", &l); | |
923 | if (!p || !l) | |
924 | return -ENOENT; | |
925 | ||
4d118c9a PH |
926 | q = strchrnul(p, ':'); |
927 | if (*q != '\0') | |
928 | options = q + 1; | |
0fcc286f | 929 | l = q - p; |
6296ad9e | 930 | |
fb11ffe7 | 931 | /* Get the node specified by stdout-path */ |
0fcc286f PH |
932 | offset = fdt_path_offset_namelen(fdt, p, l); |
933 | if (offset < 0) { | |
934 | pr_warn("earlycon: stdout-path %.*s not found\n", l, p); | |
935 | return 0; | |
936 | } | |
fb11ffe7 | 937 | |
dd709e72 DK |
938 | for (p_match = __earlycon_table; p_match < __earlycon_table_end; |
939 | p_match++) { | |
940 | const struct earlycon_id *match = *p_match; | |
941 | ||
2eaa7909 PH |
942 | if (!match->compatible[0]) |
943 | continue; | |
944 | ||
945 | if (fdt_node_check_compatible(fdt, offset, match->compatible)) | |
fb11ffe7 | 946 | continue; |
fb11ffe7 | 947 | |
c90fe9c0 | 948 | of_setup_earlycon(match, offset, options); |
fb11ffe7 RH |
949 | return 0; |
950 | } | |
951 | return -ENODEV; | |
952 | } | |
fb11ffe7 RH |
953 | #endif |
954 | ||
f00abd94 GL |
955 | /** |
956 | * early_init_dt_scan_root - fetch the top level address and size cells | |
957 | */ | |
958 | int __init early_init_dt_scan_root(unsigned long node, const char *uname, | |
959 | int depth, void *data) | |
960 | { | |
9d0c4dfe | 961 | const __be32 *prop; |
f00abd94 GL |
962 | |
963 | if (depth != 0) | |
964 | return 0; | |
965 | ||
33714881 JK |
966 | dt_root_size_cells = OF_ROOT_NODE_SIZE_CELLS_DEFAULT; |
967 | dt_root_addr_cells = OF_ROOT_NODE_ADDR_CELLS_DEFAULT; | |
968 | ||
f00abd94 | 969 | prop = of_get_flat_dt_prop(node, "#size-cells", NULL); |
33714881 JK |
970 | if (prop) |
971 | dt_root_size_cells = be32_to_cpup(prop); | |
f00abd94 GL |
972 | pr_debug("dt_root_size_cells = %x\n", dt_root_size_cells); |
973 | ||
974 | prop = of_get_flat_dt_prop(node, "#address-cells", NULL); | |
33714881 JK |
975 | if (prop) |
976 | dt_root_addr_cells = be32_to_cpup(prop); | |
f00abd94 GL |
977 | pr_debug("dt_root_addr_cells = %x\n", dt_root_addr_cells); |
978 | ||
979 | /* break now */ | |
980 | return 1; | |
981 | } | |
982 | ||
9d0c4dfe | 983 | u64 __init dt_mem_next_cell(int s, const __be32 **cellp) |
83f7a06e | 984 | { |
9d0c4dfe | 985 | const __be32 *p = *cellp; |
83f7a06e GL |
986 | |
987 | *cellp = p + s; | |
988 | return of_read_number(p, s); | |
989 | } | |
990 | ||
51975db0 | 991 | /** |
0ef5adca | 992 | * early_init_dt_scan_memory - Look for and parse memory nodes |
51975db0 GL |
993 | */ |
994 | int __init early_init_dt_scan_memory(unsigned long node, const char *uname, | |
995 | int depth, void *data) | |
996 | { | |
9d0c4dfe RH |
997 | const char *type = of_get_flat_dt_prop(node, "device_type", NULL); |
998 | const __be32 *reg, *endp; | |
999 | int l; | |
41a9ada3 | 1000 | bool hotpluggable; |
51975db0 GL |
1001 | |
1002 | /* We are scanning "memory" nodes only */ | |
da653130 | 1003 | if (type == NULL || strcmp(type, "memory") != 0) |
51975db0 GL |
1004 | return 0; |
1005 | ||
1006 | reg = of_get_flat_dt_prop(node, "linux,usable-memory", &l); | |
1007 | if (reg == NULL) | |
1008 | reg = of_get_flat_dt_prop(node, "reg", &l); | |
1009 | if (reg == NULL) | |
1010 | return 0; | |
1011 | ||
1012 | endp = reg + (l / sizeof(__be32)); | |
41a9ada3 | 1013 | hotpluggable = of_get_flat_dt_prop(node, "hotpluggable", NULL); |
51975db0 | 1014 | |
c954b36e | 1015 | pr_debug("memory scan node %s, reg size %d,\n", uname, l); |
51975db0 GL |
1016 | |
1017 | while ((endp - reg) >= (dt_root_addr_cells + dt_root_size_cells)) { | |
1018 | u64 base, size; | |
1019 | ||
1020 | base = dt_mem_next_cell(dt_root_addr_cells, ®); | |
1021 | size = dt_mem_next_cell(dt_root_size_cells, ®); | |
1022 | ||
1023 | if (size == 0) | |
1024 | continue; | |
1025 | pr_debug(" - %llx , %llx\n", (unsigned long long)base, | |
1026 | (unsigned long long)size); | |
1027 | ||
1028 | early_init_dt_add_memory_arch(base, size); | |
41a9ada3 RA |
1029 | |
1030 | if (!hotpluggable) | |
1031 | continue; | |
1032 | ||
1033 | if (early_init_dt_mark_hotplug_memory_arch(base, size)) | |
1034 | pr_warn("failed to mark hotplug range 0x%llx - 0x%llx\n", | |
1035 | base, base + size); | |
51975db0 GL |
1036 | } |
1037 | ||
1038 | return 0; | |
1039 | } | |
1040 | ||
86e03221 GL |
1041 | int __init early_init_dt_scan_chosen(unsigned long node, const char *uname, |
1042 | int depth, void *data) | |
1043 | { | |
9d0c4dfe RH |
1044 | int l; |
1045 | const char *p; | |
86e03221 GL |
1046 | |
1047 | pr_debug("search \"chosen\", depth: %d, uname: %s\n", depth, uname); | |
1048 | ||
85f60ae4 | 1049 | if (depth != 1 || !data || |
86e03221 GL |
1050 | (strcmp(uname, "chosen") != 0 && strcmp(uname, "chosen@0") != 0)) |
1051 | return 0; | |
1052 | ||
1053 | early_init_dt_check_for_initrd(node); | |
1054 | ||
25985edc | 1055 | /* Retrieve command line */ |
86e03221 GL |
1056 | p = of_get_flat_dt_prop(node, "bootargs", &l); |
1057 | if (p != NULL && l > 0) | |
b827bcbb | 1058 | strlcpy(data, p, min(l, COMMAND_LINE_SIZE)); |
86e03221 | 1059 | |
78b782cb BH |
1060 | /* |
1061 | * CONFIG_CMDLINE is meant to be a default in case nothing else | |
1062 | * managed to set the command line, unless CONFIG_CMDLINE_FORCE | |
1063 | * is set in which case we override whatever was found earlier. | |
1064 | */ | |
86e03221 | 1065 | #ifdef CONFIG_CMDLINE |
34b82026 MU |
1066 | #if defined(CONFIG_CMDLINE_EXTEND) |
1067 | strlcat(data, " ", COMMAND_LINE_SIZE); | |
1068 | strlcat(data, CONFIG_CMDLINE, COMMAND_LINE_SIZE); | |
1069 | #elif defined(CONFIG_CMDLINE_FORCE) | |
1070 | strlcpy(data, CONFIG_CMDLINE, COMMAND_LINE_SIZE); | |
1071 | #else | |
1072 | /* No arguments from boot loader, use kernel's cmdl*/ | |
78b782cb | 1073 | if (!((char *)data)[0]) |
85f60ae4 | 1074 | strlcpy(data, CONFIG_CMDLINE, COMMAND_LINE_SIZE); |
34b82026 | 1075 | #endif |
86e03221 GL |
1076 | #endif /* CONFIG_CMDLINE */ |
1077 | ||
85f60ae4 | 1078 | pr_debug("Command line is: %s\n", (char*)data); |
86e03221 GL |
1079 | |
1080 | /* break now */ | |
1081 | return 1; | |
1082 | } | |
1083 | ||
270522a0 AB |
1084 | #ifndef MIN_MEMBLOCK_ADDR |
1085 | #define MIN_MEMBLOCK_ADDR __pa(PAGE_OFFSET) | |
1086 | #endif | |
8eafeb48 AB |
1087 | #ifndef MAX_MEMBLOCK_ADDR |
1088 | #define MAX_MEMBLOCK_ADDR ((phys_addr_t)~0) | |
1089 | #endif | |
3069f0c0 | 1090 | |
068f6310 RH |
1091 | void __init __weak early_init_dt_add_memory_arch(u64 base, u64 size) |
1092 | { | |
270522a0 | 1093 | const u64 phys_offset = MIN_MEMBLOCK_ADDR; |
8f73d4b7 | 1094 | |
6072cf56 MR |
1095 | if (size < PAGE_SIZE - (base & ~PAGE_MASK)) { |
1096 | pr_warn("Ignoring memory block 0x%llx - 0x%llx\n", | |
1097 | base, base + size); | |
1098 | return; | |
1099 | } | |
1100 | ||
8f73d4b7 GU |
1101 | if (!PAGE_ALIGNED(base)) { |
1102 | size -= PAGE_SIZE - (base & ~PAGE_MASK); | |
1103 | base = PAGE_ALIGN(base); | |
1104 | } | |
068f6310 | 1105 | size &= PAGE_MASK; |
a67a6ed1 | 1106 | |
8eafeb48 | 1107 | if (base > MAX_MEMBLOCK_ADDR) { |
3069f0c0 LA |
1108 | pr_warning("Ignoring memory block 0x%llx - 0x%llx\n", |
1109 | base, base + size); | |
1110 | return; | |
1111 | } | |
a67a6ed1 | 1112 | |
8eafeb48 | 1113 | if (base + size - 1 > MAX_MEMBLOCK_ADDR) { |
9aacd602 | 1114 | pr_warning("Ignoring memory range 0x%llx - 0x%llx\n", |
8eafeb48 AB |
1115 | ((u64)MAX_MEMBLOCK_ADDR) + 1, base + size); |
1116 | size = MAX_MEMBLOCK_ADDR - base + 1; | |
a67a6ed1 LA |
1117 | } |
1118 | ||
068f6310 RH |
1119 | if (base + size < phys_offset) { |
1120 | pr_warning("Ignoring memory block 0x%llx - 0x%llx\n", | |
1121 | base, base + size); | |
1122 | return; | |
1123 | } | |
1124 | if (base < phys_offset) { | |
1125 | pr_warning("Ignoring memory range 0x%llx - 0x%llx\n", | |
1126 | base, phys_offset); | |
1127 | size -= phys_offset - base; | |
1128 | base = phys_offset; | |
1129 | } | |
1130 | memblock_add(base, size); | |
1131 | } | |
1132 | ||
41a9ada3 RA |
1133 | int __init __weak early_init_dt_mark_hotplug_memory_arch(u64 base, u64 size) |
1134 | { | |
1135 | return memblock_mark_hotplug(base, size); | |
1136 | } | |
1137 | ||
e8d9d1f5 MS |
1138 | int __init __weak early_init_dt_reserve_memory_arch(phys_addr_t base, |
1139 | phys_addr_t size, bool nomap) | |
1140 | { | |
e8d9d1f5 MS |
1141 | if (nomap) |
1142 | return memblock_remove(base, size); | |
1143 | return memblock_reserve(base, size); | |
1144 | } | |
1145 | ||
0fa1c579 | 1146 | static void * __init early_init_dt_alloc_memory_arch(u64 size, u64 align) |
aefc7ec2 | 1147 | { |
8a7f97b9 MR |
1148 | void *ptr = memblock_alloc(size, align); |
1149 | ||
1150 | if (!ptr) | |
1151 | panic("%s: Failed to allocate %llu bytes align=0x%llx\n", | |
1152 | __func__, size, align); | |
1153 | ||
1154 | return ptr; | |
aefc7ec2 | 1155 | } |
a1727da5 | 1156 | |
4972a74b | 1157 | bool __init early_init_dt_verify(void *params) |
0288ffcb RH |
1158 | { |
1159 | if (!params) | |
1160 | return false; | |
1161 | ||
0288ffcb | 1162 | /* check device tree validity */ |
50ba08f3 | 1163 | if (fdt_check_header(params)) |
0288ffcb | 1164 | return false; |
0288ffcb | 1165 | |
50ba08f3 BH |
1166 | /* Setup flat device-tree pointer */ |
1167 | initial_boot_params = params; | |
08d53aa5 AB |
1168 | of_fdt_crc32 = crc32_be(~0, initial_boot_params, |
1169 | fdt_totalsize(initial_boot_params)); | |
4972a74b LA |
1170 | return true; |
1171 | } | |
1172 | ||
1173 | ||
1174 | void __init early_init_dt_scan_nodes(void) | |
1175 | { | |
e1e52544 NK |
1176 | int rc = 0; |
1177 | ||
0288ffcb | 1178 | /* Retrieve various information from the /chosen node */ |
e1e52544 NK |
1179 | rc = of_scan_flat_dt(early_init_dt_scan_chosen, boot_command_line); |
1180 | if (!rc) | |
1181 | pr_warn("No chosen node found, continuing without\n"); | |
0288ffcb RH |
1182 | |
1183 | /* Initialize {size,address}-cells info */ | |
1184 | of_scan_flat_dt(early_init_dt_scan_root, NULL); | |
1185 | ||
1186 | /* Setup memory, calling early_init_dt_add_memory_arch */ | |
1187 | of_scan_flat_dt(early_init_dt_scan_memory, NULL); | |
4972a74b LA |
1188 | } |
1189 | ||
1190 | bool __init early_init_dt_scan(void *params) | |
1191 | { | |
1192 | bool status; | |
1193 | ||
1194 | status = early_init_dt_verify(params); | |
1195 | if (!status) | |
1196 | return false; | |
0288ffcb | 1197 | |
4972a74b | 1198 | early_init_dt_scan_nodes(); |
0288ffcb RH |
1199 | return true; |
1200 | } | |
1201 | ||
41f88009 GL |
1202 | /** |
1203 | * unflatten_device_tree - create tree of device_nodes from flat blob | |
1204 | * | |
1205 | * unflattens the device-tree passed by the firmware, creating the | |
1206 | * tree of struct device_node. It also fills the "name" and "type" | |
1207 | * pointers of the nodes so the normal device-tree walking functions | |
1208 | * can be used. | |
1209 | */ | |
1210 | void __init unflatten_device_tree(void) | |
1211 | { | |
c4263233 | 1212 | __unflatten_device_tree(initial_boot_params, NULL, &of_root, |
1d1bde55 | 1213 | early_init_dt_alloc_memory_arch, false); |
41f88009 | 1214 | |
4c7d6361 | 1215 | /* Get pointer to "/chosen" and "/aliases" nodes for use everywhere */ |
611cad72 | 1216 | of_alias_scan(early_init_dt_alloc_memory_arch); |
81d0848f FR |
1217 | |
1218 | unittest_unflatten_overlay_base(); | |
41f88009 | 1219 | } |
e6ce1324 | 1220 | |
a8bf7527 RH |
1221 | /** |
1222 | * unflatten_and_copy_device_tree - copy and create tree of device_nodes from flat blob | |
1223 | * | |
1224 | * Copies and unflattens the device-tree passed by the firmware, creating the | |
1225 | * tree of struct device_node. It also fills the "name" and "type" | |
1226 | * pointers of the nodes so the normal device-tree walking functions | |
1227 | * can be used. This should only be used when the FDT memory has not been | |
1228 | * reserved such is the case when the FDT is built-in to the kernel init | |
1229 | * section. If the FDT memory is reserved already then unflatten_device_tree | |
1230 | * should be used instead. | |
1231 | */ | |
1232 | void __init unflatten_and_copy_device_tree(void) | |
1233 | { | |
6f041e99 JH |
1234 | int size; |
1235 | void *dt; | |
1236 | ||
1237 | if (!initial_boot_params) { | |
1238 | pr_warn("No valid device tree found, continuing without\n"); | |
1239 | return; | |
1240 | } | |
1241 | ||
c972de14 | 1242 | size = fdt_totalsize(initial_boot_params); |
6f041e99 | 1243 | dt = early_init_dt_alloc_memory_arch(size, |
c972de14 | 1244 | roundup_pow_of_two(FDT_V17_SIZE)); |
a8bf7527 RH |
1245 | |
1246 | if (dt) { | |
1247 | memcpy(dt, initial_boot_params, size); | |
1248 | initial_boot_params = dt; | |
1249 | } | |
1250 | unflatten_device_tree(); | |
1251 | } | |
1252 | ||
08d53aa5 AB |
1253 | #ifdef CONFIG_SYSFS |
1254 | static ssize_t of_fdt_raw_read(struct file *filp, struct kobject *kobj, | |
1255 | struct bin_attribute *bin_attr, | |
1256 | char *buf, loff_t off, size_t count) | |
b0a6fb36 | 1257 | { |
08d53aa5 AB |
1258 | memcpy(buf, initial_boot_params + off, count); |
1259 | return count; | |
1260 | } | |
b0a6fb36 | 1261 | |
08d53aa5 AB |
1262 | static int __init of_fdt_raw_init(void) |
1263 | { | |
1264 | static struct bin_attribute of_fdt_raw_attr = | |
1265 | __BIN_ATTR(fdt, S_IRUSR, of_fdt_raw_read, NULL, 0); | |
b0a6fb36 | 1266 | |
08d53aa5 AB |
1267 | if (!initial_boot_params) |
1268 | return 0; | |
b0a6fb36 | 1269 | |
08d53aa5 AB |
1270 | if (of_fdt_crc32 != crc32_be(~0, initial_boot_params, |
1271 | fdt_totalsize(initial_boot_params))) { | |
606ad42a | 1272 | pr_warn("not creating '/sys/firmware/fdt': CRC check failed\n"); |
08d53aa5 AB |
1273 | return 0; |
1274 | } | |
1275 | of_fdt_raw_attr.size = fdt_totalsize(initial_boot_params); | |
1276 | return sysfs_create_bin_file(firmware_kobj, &of_fdt_raw_attr); | |
b0a6fb36 | 1277 | } |
08d53aa5 | 1278 | late_initcall(of_fdt_raw_init); |
b0a6fb36 RH |
1279 | #endif |
1280 | ||
e6ce1324 | 1281 | #endif /* CONFIG_OF_EARLY_FLATTREE */ |