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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> |
0fa1c579 | 14 | #include <linux/bootmem.h> |
a1727da5 | 15 | #include <linux/memblock.h> |
f8062386 | 16 | #include <linux/mutex.h> |
e169cfbe GL |
17 | #include <linux/of.h> |
18 | #include <linux/of_fdt.h> | |
3f0c8206 | 19 | #include <linux/of_reserved_mem.h> |
e8d9d1f5 | 20 | #include <linux/sizes.h> |
4ef7b373 JK |
21 | #include <linux/string.h> |
22 | #include <linux/errno.h> | |
fe140423 | 23 | #include <linux/slab.h> |
e6a6928c | 24 | #include <linux/libfdt.h> |
b0a6fb36 | 25 | #include <linux/debugfs.h> |
fb11ffe7 | 26 | #include <linux/serial_core.h> |
08d53aa5 | 27 | #include <linux/sysfs.h> |
51975db0 | 28 | |
c89810ac | 29 | #include <asm/setup.h> /* for COMMAND_LINE_SIZE */ |
4ef7b373 JK |
30 | #include <asm/page.h> |
31 | ||
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 | */ | |
42 | void of_fdt_limit_memory(int limit) | |
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 | ||
9706a36e SN |
82 | /** |
83 | * of_fdt_is_compatible - Return true if given node from the given blob has | |
84 | * compat in its compatible list | |
85 | * @blob: A device tree blob | |
86 | * @node: node to test | |
87 | * @compat: compatible string to compare with compatible list. | |
a4f740cf GL |
88 | * |
89 | * On match, returns a non-zero value with smaller values returned for more | |
90 | * specific compatible values. | |
9706a36e | 91 | */ |
92af0899 | 92 | static int of_fdt_is_compatible(const void *blob, |
9706a36e SN |
93 | unsigned long node, const char *compat) |
94 | { | |
95 | const char *cp; | |
9d0c4dfe RH |
96 | int cplen; |
97 | unsigned long l, score = 0; | |
9706a36e | 98 | |
e6a6928c | 99 | cp = fdt_getprop(blob, node, "compatible", &cplen); |
9706a36e SN |
100 | if (cp == NULL) |
101 | return 0; | |
102 | while (cplen > 0) { | |
a4f740cf | 103 | score++; |
9706a36e | 104 | if (of_compat_cmp(cp, compat, strlen(compat)) == 0) |
a4f740cf | 105 | return score; |
9706a36e SN |
106 | l = strlen(cp) + 1; |
107 | cp += l; | |
108 | cplen -= l; | |
109 | } | |
110 | ||
111 | return 0; | |
112 | } | |
113 | ||
cc783786 KC |
114 | /** |
115 | * of_fdt_is_big_endian - Return true if given node needs BE MMIO accesses | |
116 | * @blob: A device tree blob | |
117 | * @node: node to test | |
118 | * | |
119 | * Returns true if the node has a "big-endian" property, or if the kernel | |
120 | * was compiled for BE *and* the node has a "native-endian" property. | |
121 | * Returns false otherwise. | |
122 | */ | |
123 | bool of_fdt_is_big_endian(const void *blob, unsigned long node) | |
124 | { | |
125 | if (fdt_getprop(blob, node, "big-endian", NULL)) | |
126 | return true; | |
127 | if (IS_ENABLED(CONFIG_CPU_BIG_ENDIAN) && | |
128 | fdt_getprop(blob, node, "native-endian", NULL)) | |
129 | return true; | |
130 | return false; | |
131 | } | |
132 | ||
ecc8a96e RH |
133 | static bool of_fdt_device_is_available(const void *blob, unsigned long node) |
134 | { | |
135 | const char *status = fdt_getprop(blob, node, "status", NULL); | |
136 | ||
137 | if (!status) | |
138 | return true; | |
139 | ||
140 | if (!strcmp(status, "ok") || !strcmp(status, "okay")) | |
141 | return true; | |
142 | ||
143 | return false; | |
144 | } | |
145 | ||
a4f740cf GL |
146 | /** |
147 | * of_fdt_match - Return true if node matches a list of compatible values | |
148 | */ | |
c972de14 | 149 | int of_fdt_match(const void *blob, unsigned long node, |
7b482c83 | 150 | const char *const *compat) |
a4f740cf GL |
151 | { |
152 | unsigned int tmp, score = 0; | |
153 | ||
154 | if (!compat) | |
155 | return 0; | |
156 | ||
157 | while (*compat) { | |
158 | tmp = of_fdt_is_compatible(blob, node, *compat); | |
159 | if (tmp && (score == 0 || (tmp < score))) | |
160 | score = tmp; | |
161 | compat++; | |
162 | } | |
163 | ||
164 | return score; | |
165 | } | |
166 | ||
44856819 | 167 | static void *unflatten_dt_alloc(void **mem, unsigned long size, |
bbd33931 GL |
168 | unsigned long align) |
169 | { | |
170 | void *res; | |
171 | ||
44856819 GL |
172 | *mem = PTR_ALIGN(*mem, align); |
173 | res = *mem; | |
bbd33931 GL |
174 | *mem += size; |
175 | ||
176 | return res; | |
177 | } | |
178 | ||
dfbd4c6e GS |
179 | static void populate_properties(const void *blob, |
180 | int offset, | |
181 | void **mem, | |
182 | struct device_node *np, | |
183 | const char *nodename, | |
5063e25a | 184 | bool dryrun) |
bbd33931 | 185 | { |
dfbd4c6e GS |
186 | struct property *pp, **pprev = NULL; |
187 | int cur; | |
188 | bool has_name = false; | |
189 | ||
190 | pprev = &np->properties; | |
191 | for (cur = fdt_first_property_offset(blob, offset); | |
192 | cur >= 0; | |
193 | cur = fdt_next_property_offset(blob, cur)) { | |
194 | const __be32 *val; | |
195 | const char *pname; | |
196 | u32 sz; | |
197 | ||
198 | val = fdt_getprop_by_offset(blob, cur, &pname, &sz); | |
199 | if (!val) { | |
606ad42a | 200 | pr_warn("Cannot locate property at 0x%x\n", cur); |
dfbd4c6e GS |
201 | continue; |
202 | } | |
203 | ||
204 | if (!pname) { | |
606ad42a | 205 | pr_warn("Cannot find property name at 0x%x\n", cur); |
dfbd4c6e GS |
206 | continue; |
207 | } | |
208 | ||
209 | if (!strcmp(pname, "name")) | |
210 | has_name = true; | |
211 | ||
212 | pp = unflatten_dt_alloc(mem, sizeof(struct property), | |
213 | __alignof__(struct property)); | |
214 | if (dryrun) | |
215 | continue; | |
216 | ||
217 | /* We accept flattened tree phandles either in | |
218 | * ePAPR-style "phandle" properties, or the | |
219 | * legacy "linux,phandle" properties. If both | |
220 | * appear and have different values, things | |
221 | * will get weird. Don't do that. | |
222 | */ | |
223 | if (!strcmp(pname, "phandle") || | |
224 | !strcmp(pname, "linux,phandle")) { | |
225 | if (!np->phandle) | |
226 | np->phandle = be32_to_cpup(val); | |
227 | } | |
228 | ||
229 | /* And we process the "ibm,phandle" property | |
230 | * used in pSeries dynamic device tree | |
231 | * stuff | |
232 | */ | |
233 | if (!strcmp(pname, "ibm,phandle")) | |
234 | np->phandle = be32_to_cpup(val); | |
235 | ||
236 | pp->name = (char *)pname; | |
237 | pp->length = sz; | |
238 | pp->value = (__be32 *)val; | |
239 | *pprev = pp; | |
240 | pprev = &pp->next; | |
241 | } | |
242 | ||
243 | /* With version 0x10 we may not have the name property, | |
244 | * recreate it here from the unit name if absent | |
245 | */ | |
246 | if (!has_name) { | |
247 | const char *p = nodename, *ps = p, *pa = NULL; | |
248 | int len; | |
249 | ||
250 | while (*p) { | |
251 | if ((*p) == '@') | |
252 | pa = p; | |
253 | else if ((*p) == '/') | |
254 | ps = p + 1; | |
255 | p++; | |
256 | } | |
257 | ||
258 | if (pa < ps) | |
259 | pa = p; | |
260 | len = (pa - ps) + 1; | |
261 | pp = unflatten_dt_alloc(mem, sizeof(struct property) + len, | |
262 | __alignof__(struct property)); | |
263 | if (!dryrun) { | |
264 | pp->name = "name"; | |
265 | pp->length = len; | |
266 | pp->value = pp + 1; | |
267 | *pprev = pp; | |
268 | pprev = &pp->next; | |
269 | memcpy(pp->value, ps, len - 1); | |
270 | ((char *)pp->value)[len - 1] = 0; | |
271 | pr_debug("fixed up name for %s -> %s\n", | |
272 | nodename, (char *)pp->value); | |
273 | } | |
274 | } | |
275 | ||
276 | if (!dryrun) | |
277 | *pprev = NULL; | |
278 | } | |
279 | ||
a7e4cfb0 RH |
280 | static bool populate_node(const void *blob, |
281 | int offset, | |
282 | void **mem, | |
283 | struct device_node *dad, | |
284 | struct device_node **pnp, | |
285 | bool dryrun) | |
dfbd4c6e | 286 | { |
bbd33931 | 287 | struct device_node *np; |
e6a6928c | 288 | const char *pathp; |
bbd33931 | 289 | unsigned int l, allocl; |
bbd33931 | 290 | |
dfbd4c6e GS |
291 | pathp = fdt_get_name(blob, offset, &l); |
292 | if (!pathp) { | |
293 | *pnp = NULL; | |
a7e4cfb0 | 294 | return false; |
dfbd4c6e | 295 | } |
e6a6928c | 296 | |
05f4647b | 297 | allocl = ++l; |
bbd33931 | 298 | |
dfbd4c6e | 299 | np = unflatten_dt_alloc(mem, sizeof(struct device_node) + allocl, |
bbd33931 | 300 | __alignof__(struct device_node)); |
5063e25a | 301 | if (!dryrun) { |
c22618a1 | 302 | char *fn; |
0829f6d1 | 303 | of_node_init(np); |
c22618a1 | 304 | np->full_name = fn = ((char *)np) + sizeof(*np); |
a7e4cfb0 | 305 | |
c22618a1 GL |
306 | memcpy(fn, pathp, l); |
307 | ||
bbd33931 GL |
308 | if (dad != NULL) { |
309 | np->parent = dad; | |
70161ff3 GL |
310 | np->sibling = dad->child; |
311 | dad->child = np; | |
bbd33931 | 312 | } |
bbd33931 | 313 | } |
e6a6928c | 314 | |
dfbd4c6e | 315 | populate_properties(blob, offset, mem, np, pathp, dryrun); |
5063e25a | 316 | if (!dryrun) { |
bbd33931 GL |
317 | np->name = of_get_property(np, "name", NULL); |
318 | np->type = of_get_property(np, "device_type", NULL); | |
319 | ||
320 | if (!np->name) | |
321 | np->name = "<NULL>"; | |
322 | if (!np->type) | |
323 | np->type = "<NULL>"; | |
324 | } | |
e6a6928c | 325 | |
dfbd4c6e | 326 | *pnp = np; |
a7e4cfb0 | 327 | return true; |
dfbd4c6e GS |
328 | } |
329 | ||
50800082 GS |
330 | static void reverse_nodes(struct device_node *parent) |
331 | { | |
332 | struct device_node *child, *next; | |
333 | ||
334 | /* In-depth first */ | |
335 | child = parent->child; | |
336 | while (child) { | |
337 | reverse_nodes(child); | |
338 | ||
339 | child = child->sibling; | |
340 | } | |
341 | ||
342 | /* Reverse the nodes in the child list */ | |
343 | child = parent->child; | |
344 | parent->child = NULL; | |
345 | while (child) { | |
346 | next = child->sibling; | |
347 | ||
348 | child->sibling = parent->child; | |
349 | parent->child = child; | |
350 | child = next; | |
351 | } | |
352 | } | |
353 | ||
dfbd4c6e | 354 | /** |
947c82cb | 355 | * unflatten_dt_nodes - Alloc and populate a device_node from the flat tree |
dfbd4c6e GS |
356 | * @blob: The parent device tree blob |
357 | * @mem: Memory chunk to use for allocating device nodes and properties | |
dfbd4c6e GS |
358 | * @dad: Parent struct device_node |
359 | * @nodepp: The device_node tree created by the call | |
50800082 GS |
360 | * |
361 | * It returns the size of unflattened device tree or error code | |
dfbd4c6e | 362 | */ |
947c82cb GS |
363 | static int unflatten_dt_nodes(const void *blob, |
364 | void *mem, | |
365 | struct device_node *dad, | |
366 | struct device_node **nodepp) | |
dfbd4c6e | 367 | { |
50800082 | 368 | struct device_node *root; |
8c237cd0 | 369 | int offset = 0, depth = 0, initial_depth = 0; |
50800082 | 370 | #define FDT_MAX_DEPTH 64 |
50800082 GS |
371 | struct device_node *nps[FDT_MAX_DEPTH]; |
372 | void *base = mem; | |
373 | bool dryrun = !base; | |
dfbd4c6e | 374 | |
50800082 GS |
375 | if (nodepp) |
376 | *nodepp = NULL; | |
377 | ||
8c237cd0 GS |
378 | /* |
379 | * We're unflattening device sub-tree if @dad is valid. There are | |
380 | * possibly multiple nodes in the first level of depth. We need | |
381 | * set @depth to 1 to make fdt_next_node() happy as it bails | |
382 | * immediately when negative @depth is found. Otherwise, the device | |
383 | * nodes except the first one won't be unflattened successfully. | |
384 | */ | |
385 | if (dad) | |
386 | depth = initial_depth = 1; | |
387 | ||
50800082 | 388 | root = dad; |
78c44d91 | 389 | nps[depth] = dad; |
8c237cd0 | 390 | |
50800082 | 391 | for (offset = 0; |
8c237cd0 | 392 | offset >= 0 && depth >= initial_depth; |
50800082 GS |
393 | offset = fdt_next_node(blob, offset, &depth)) { |
394 | if (WARN_ON_ONCE(depth >= FDT_MAX_DEPTH)) | |
395 | continue; | |
dfbd4c6e | 396 | |
77ea8a68 RH |
397 | if (!IS_ENABLED(CONFIG_OF_KOBJ) && |
398 | !of_fdt_device_is_available(blob, offset)) | |
399 | continue; | |
400 | ||
a7e4cfb0 RH |
401 | if (!populate_node(blob, offset, &mem, nps[depth], |
402 | &nps[depth+1], dryrun)) | |
50800082 GS |
403 | return mem - base; |
404 | ||
405 | if (!dryrun && nodepp && !*nodepp) | |
78c44d91 | 406 | *nodepp = nps[depth+1]; |
50800082 | 407 | if (!dryrun && !root) |
78c44d91 | 408 | root = nps[depth+1]; |
50800082 | 409 | } |
e6a6928c | 410 | |
50800082 | 411 | if (offset < 0 && offset != -FDT_ERR_NOTFOUND) { |
606ad42a | 412 | pr_err("Error %d processing FDT\n", offset); |
50800082 GS |
413 | return -EINVAL; |
414 | } | |
e6a6928c | 415 | |
70161ff3 GL |
416 | /* |
417 | * Reverse the child list. Some drivers assumes node order matches .dts | |
418 | * node order | |
419 | */ | |
50800082 GS |
420 | if (!dryrun) |
421 | reverse_nodes(root); | |
e6a6928c | 422 | |
50800082 | 423 | return mem - base; |
bbd33931 | 424 | } |
41f88009 | 425 | |
fe140423 SN |
426 | /** |
427 | * __unflatten_device_tree - create tree of device_nodes from flat blob | |
428 | * | |
429 | * unflattens a device-tree, creating the | |
430 | * tree of struct device_node. It also fills the "name" and "type" | |
431 | * pointers of the nodes so the normal device-tree walking functions | |
432 | * can be used. | |
433 | * @blob: The blob to expand | |
c4263233 | 434 | * @dad: Parent device node |
fe140423 SN |
435 | * @mynodes: The device_node tree created by the call |
436 | * @dt_alloc: An allocator that provides a virtual address to memory | |
437 | * for the resulting tree | |
f5d2da67 | 438 | * @detached: if true set OF_DETACHED on @mynodes |
83262418 GS |
439 | * |
440 | * Returns NULL on failure or the memory chunk containing the unflattened | |
441 | * device tree on success. | |
fe140423 | 442 | */ |
81d0848f FR |
443 | void *__unflatten_device_tree(const void *blob, |
444 | struct device_node *dad, | |
445 | struct device_node **mynodes, | |
446 | void *(*dt_alloc)(u64 size, u64 align), | |
447 | bool detached) | |
fe140423 | 448 | { |
50800082 | 449 | int size; |
e6a6928c | 450 | void *mem; |
fe140423 SN |
451 | |
452 | pr_debug(" -> unflatten_device_tree()\n"); | |
453 | ||
454 | if (!blob) { | |
455 | pr_debug("No device tree pointer\n"); | |
83262418 | 456 | return NULL; |
fe140423 SN |
457 | } |
458 | ||
459 | pr_debug("Unflattening device tree:\n"); | |
c972de14 RH |
460 | pr_debug("magic: %08x\n", fdt_magic(blob)); |
461 | pr_debug("size: %08x\n", fdt_totalsize(blob)); | |
462 | pr_debug("version: %08x\n", fdt_version(blob)); | |
fe140423 | 463 | |
c972de14 | 464 | if (fdt_check_header(blob)) { |
fe140423 | 465 | pr_err("Invalid device tree blob header\n"); |
83262418 | 466 | return NULL; |
fe140423 SN |
467 | } |
468 | ||
469 | /* First pass, scan for size */ | |
c4263233 | 470 | size = unflatten_dt_nodes(blob, NULL, dad, NULL); |
50800082 | 471 | if (size < 0) |
83262418 | 472 | return NULL; |
fe140423 | 473 | |
50800082 GS |
474 | size = ALIGN(size, 4); |
475 | pr_debug(" size is %d, allocating...\n", size); | |
fe140423 SN |
476 | |
477 | /* Allocate memory for the expanded device tree */ | |
44856819 | 478 | mem = dt_alloc(size + 4, __alignof__(struct device_node)); |
49e67dd1 JH |
479 | if (!mem) |
480 | return NULL; | |
481 | ||
44856819 | 482 | memset(mem, 0, size); |
fe140423 | 483 | |
44856819 | 484 | *(__be32 *)(mem + size) = cpu_to_be32(0xdeadbeef); |
9e401275 | 485 | |
44856819 | 486 | pr_debug(" unflattening %p...\n", mem); |
fe140423 SN |
487 | |
488 | /* Second pass, do actual unflattening */ | |
c4263233 | 489 | unflatten_dt_nodes(blob, mem, dad, mynodes); |
44856819 | 490 | if (be32_to_cpup(mem + size) != 0xdeadbeef) |
fe140423 | 491 | pr_warning("End of tree marker overwritten: %08x\n", |
44856819 | 492 | be32_to_cpup(mem + size)); |
fe140423 | 493 | |
89c67752 | 494 | if (detached && mynodes) { |
1d1bde55 MS |
495 | of_node_set_flag(*mynodes, OF_DETACHED); |
496 | pr_debug("unflattened tree is detached\n"); | |
497 | } | |
498 | ||
fe140423 | 499 | pr_debug(" <- unflatten_device_tree()\n"); |
83262418 | 500 | return mem; |
fe140423 SN |
501 | } |
502 | ||
503 | static void *kernel_tree_alloc(u64 size, u64 align) | |
504 | { | |
505 | return kzalloc(size, GFP_KERNEL); | |
506 | } | |
507 | ||
f8062386 GR |
508 | static DEFINE_MUTEX(of_fdt_unflatten_mutex); |
509 | ||
fe140423 SN |
510 | /** |
511 | * of_fdt_unflatten_tree - create tree of device_nodes from flat blob | |
c4263233 GS |
512 | * @blob: Flat device tree blob |
513 | * @dad: Parent device node | |
514 | * @mynodes: The device tree created by the call | |
fe140423 SN |
515 | * |
516 | * unflattens the device-tree passed by the firmware, creating the | |
517 | * tree of struct device_node. It also fills the "name" and "type" | |
518 | * pointers of the nodes so the normal device-tree walking functions | |
519 | * can be used. | |
83262418 GS |
520 | * |
521 | * Returns NULL on failure or the memory chunk containing the unflattened | |
522 | * device tree on success. | |
fe140423 | 523 | */ |
83262418 GS |
524 | void *of_fdt_unflatten_tree(const unsigned long *blob, |
525 | struct device_node *dad, | |
526 | struct device_node **mynodes) | |
fe140423 | 527 | { |
83262418 GS |
528 | void *mem; |
529 | ||
f8062386 | 530 | mutex_lock(&of_fdt_unflatten_mutex); |
1d1bde55 MS |
531 | mem = __unflatten_device_tree(blob, dad, mynodes, &kernel_tree_alloc, |
532 | true); | |
f8062386 | 533 | mutex_unlock(&of_fdt_unflatten_mutex); |
83262418 GS |
534 | |
535 | return mem; | |
fe140423 SN |
536 | } |
537 | EXPORT_SYMBOL_GPL(of_fdt_unflatten_tree); | |
538 | ||
57d00ecf SN |
539 | /* Everything below here references initial_boot_params directly. */ |
540 | int __initdata dt_root_addr_cells; | |
541 | int __initdata dt_root_size_cells; | |
542 | ||
1daa0c4c | 543 | void *initial_boot_params; |
57d00ecf SN |
544 | |
545 | #ifdef CONFIG_OF_EARLY_FLATTREE | |
546 | ||
08d53aa5 AB |
547 | static u32 of_fdt_crc32; |
548 | ||
e8d9d1f5 MS |
549 | /** |
550 | * res_mem_reserve_reg() - reserve all memory described in 'reg' property | |
551 | */ | |
552 | static int __init __reserved_mem_reserve_reg(unsigned long node, | |
553 | const char *uname) | |
554 | { | |
555 | int t_len = (dt_root_addr_cells + dt_root_size_cells) * sizeof(__be32); | |
556 | phys_addr_t base, size; | |
9d0c4dfe RH |
557 | int len; |
558 | const __be32 *prop; | |
3f0c8206 | 559 | int nomap, first = 1; |
e8d9d1f5 MS |
560 | |
561 | prop = of_get_flat_dt_prop(node, "reg", &len); | |
562 | if (!prop) | |
563 | return -ENOENT; | |
564 | ||
565 | if (len && len % t_len != 0) { | |
566 | pr_err("Reserved memory: invalid reg property in '%s', skipping node.\n", | |
567 | uname); | |
568 | return -EINVAL; | |
569 | } | |
570 | ||
571 | nomap = of_get_flat_dt_prop(node, "no-map", NULL) != NULL; | |
572 | ||
573 | while (len >= t_len) { | |
574 | base = dt_mem_next_cell(dt_root_addr_cells, &prop); | |
575 | size = dt_mem_next_cell(dt_root_size_cells, &prop); | |
576 | ||
b5f2a8c0 | 577 | if (size && |
e8d9d1f5 MS |
578 | early_init_dt_reserve_memory_arch(base, size, nomap) == 0) |
579 | pr_debug("Reserved memory: reserved region for node '%s': base %pa, size %ld MiB\n", | |
580 | uname, &base, (unsigned long)size / SZ_1M); | |
581 | else | |
582 | pr_info("Reserved memory: failed to reserve memory for node '%s': base %pa, size %ld MiB\n", | |
583 | uname, &base, (unsigned long)size / SZ_1M); | |
584 | ||
585 | len -= t_len; | |
3f0c8206 MS |
586 | if (first) { |
587 | fdt_reserved_mem_save_node(node, uname, base, size); | |
588 | first = 0; | |
589 | } | |
e8d9d1f5 MS |
590 | } |
591 | return 0; | |
592 | } | |
593 | ||
594 | /** | |
595 | * __reserved_mem_check_root() - check if #size-cells, #address-cells provided | |
596 | * in /reserved-memory matches the values supported by the current implementation, | |
597 | * also check if ranges property has been provided | |
598 | */ | |
5b624118 | 599 | static int __init __reserved_mem_check_root(unsigned long node) |
e8d9d1f5 | 600 | { |
9d0c4dfe | 601 | const __be32 *prop; |
e8d9d1f5 MS |
602 | |
603 | prop = of_get_flat_dt_prop(node, "#size-cells", NULL); | |
604 | if (!prop || be32_to_cpup(prop) != dt_root_size_cells) | |
605 | return -EINVAL; | |
606 | ||
607 | prop = of_get_flat_dt_prop(node, "#address-cells", NULL); | |
608 | if (!prop || be32_to_cpup(prop) != dt_root_addr_cells) | |
609 | return -EINVAL; | |
610 | ||
611 | prop = of_get_flat_dt_prop(node, "ranges", NULL); | |
612 | if (!prop) | |
613 | return -EINVAL; | |
614 | return 0; | |
615 | } | |
616 | ||
617 | /** | |
618 | * fdt_scan_reserved_mem() - scan a single FDT node for reserved memory | |
619 | */ | |
620 | static int __init __fdt_scan_reserved_mem(unsigned long node, const char *uname, | |
621 | int depth, void *data) | |
622 | { | |
623 | static int found; | |
3f0c8206 | 624 | int err; |
e8d9d1f5 MS |
625 | |
626 | if (!found && depth == 1 && strcmp(uname, "reserved-memory") == 0) { | |
627 | if (__reserved_mem_check_root(node) != 0) { | |
628 | pr_err("Reserved memory: unsupported node format, ignoring\n"); | |
629 | /* break scan */ | |
630 | return 1; | |
631 | } | |
632 | found = 1; | |
633 | /* scan next node */ | |
634 | return 0; | |
635 | } else if (!found) { | |
636 | /* scan next node */ | |
637 | return 0; | |
638 | } else if (found && depth < 2) { | |
639 | /* scanning of /reserved-memory has been finished */ | |
640 | return 1; | |
641 | } | |
642 | ||
ecc8a96e | 643 | if (!of_fdt_device_is_available(initial_boot_params, node)) |
e8d9d1f5 MS |
644 | return 0; |
645 | ||
3f0c8206 MS |
646 | err = __reserved_mem_reserve_reg(node, uname); |
647 | if (err == -ENOENT && of_get_flat_dt_prop(node, "size", NULL)) | |
648 | fdt_reserved_mem_save_node(node, uname, 0, 0); | |
e8d9d1f5 MS |
649 | |
650 | /* scan next node */ | |
651 | return 0; | |
652 | } | |
653 | ||
654 | /** | |
655 | * early_init_fdt_scan_reserved_mem() - create reserved memory regions | |
656 | * | |
657 | * This function grabs memory from early allocator for device exclusive use | |
658 | * defined in device tree structures. It should be called by arch specific code | |
659 | * once the early allocator (i.e. memblock) has been fully activated. | |
660 | */ | |
661 | void __init early_init_fdt_scan_reserved_mem(void) | |
662 | { | |
d1552ce4 RH |
663 | int n; |
664 | u64 base, size; | |
665 | ||
2040b527 JC |
666 | if (!initial_boot_params) |
667 | return; | |
668 | ||
d1552ce4 RH |
669 | /* Process header /memreserve/ fields */ |
670 | for (n = 0; ; n++) { | |
671 | fdt_get_mem_rsv(initial_boot_params, n, &base, &size); | |
672 | if (!size) | |
673 | break; | |
674 | early_init_dt_reserve_memory_arch(base, size, 0); | |
675 | } | |
676 | ||
e8d9d1f5 | 677 | of_scan_flat_dt(__fdt_scan_reserved_mem, NULL); |
3f0c8206 | 678 | fdt_init_reserved_mem(); |
e8d9d1f5 MS |
679 | } |
680 | ||
24bbd929 AB |
681 | /** |
682 | * early_init_fdt_reserve_self() - reserve the memory used by the FDT blob | |
683 | */ | |
684 | void __init early_init_fdt_reserve_self(void) | |
685 | { | |
686 | if (!initial_boot_params) | |
687 | return; | |
688 | ||
689 | /* Reserve the dtb region */ | |
690 | early_init_dt_reserve_memory_arch(__pa(initial_boot_params), | |
691 | fdt_totalsize(initial_boot_params), | |
692 | 0); | |
693 | } | |
694 | ||
57d00ecf SN |
695 | /** |
696 | * of_scan_flat_dt - scan flattened tree blob and call callback on each. | |
697 | * @it: callback function | |
698 | * @data: context data pointer | |
699 | * | |
700 | * This function is used to scan the flattened device-tree, it is | |
701 | * used to extract the memory information at boot before we can | |
702 | * unflatten the tree | |
703 | */ | |
704 | int __init of_scan_flat_dt(int (*it)(unsigned long node, | |
705 | const char *uname, int depth, | |
706 | void *data), | |
707 | void *data) | |
708 | { | |
e6a6928c RH |
709 | const void *blob = initial_boot_params; |
710 | const char *pathp; | |
711 | int offset, rc = 0, depth = -1; | |
712 | ||
3ec75441 TW |
713 | if (!blob) |
714 | return 0; | |
715 | ||
716 | for (offset = fdt_next_node(blob, -1, &depth); | |
717 | offset >= 0 && depth >= 0 && !rc; | |
718 | offset = fdt_next_node(blob, offset, &depth)) { | |
e6a6928c RH |
719 | |
720 | pathp = fdt_get_name(blob, offset, NULL); | |
375da3a7 AS |
721 | if (*pathp == '/') |
722 | pathp = kbasename(pathp); | |
e6a6928c RH |
723 | rc = it(offset, pathp, depth, data); |
724 | } | |
57d00ecf SN |
725 | return rc; |
726 | } | |
727 | ||
ea47dd19 NP |
728 | /** |
729 | * of_scan_flat_dt_subnodes - scan sub-nodes of a node call callback on each. | |
730 | * @it: callback function | |
731 | * @data: context data pointer | |
732 | * | |
733 | * This function is used to scan sub-nodes of a node. | |
734 | */ | |
735 | int __init of_scan_flat_dt_subnodes(unsigned long parent, | |
736 | int (*it)(unsigned long node, | |
737 | const char *uname, | |
738 | void *data), | |
739 | void *data) | |
740 | { | |
741 | const void *blob = initial_boot_params; | |
742 | int node; | |
743 | ||
744 | fdt_for_each_subnode(node, blob, parent) { | |
745 | const char *pathp; | |
746 | int rc; | |
747 | ||
748 | pathp = fdt_get_name(blob, node, NULL); | |
749 | if (*pathp == '/') | |
750 | pathp = kbasename(pathp); | |
751 | rc = it(node, pathp, data); | |
752 | if (rc) | |
753 | return rc; | |
754 | } | |
755 | return 0; | |
756 | } | |
757 | ||
9c609868 SZ |
758 | /** |
759 | * of_get_flat_dt_subnode_by_name - get the subnode by given name | |
760 | * | |
761 | * @node: the parent node | |
762 | * @uname: the name of subnode | |
763 | * @return offset of the subnode, or -FDT_ERR_NOTFOUND if there is none | |
764 | */ | |
765 | ||
766 | int of_get_flat_dt_subnode_by_name(unsigned long node, const char *uname) | |
767 | { | |
768 | return fdt_subnode_offset(initial_boot_params, node, uname); | |
769 | } | |
770 | ||
57d00ecf SN |
771 | /** |
772 | * of_get_flat_dt_root - find the root node in the flat blob | |
773 | */ | |
774 | unsigned long __init of_get_flat_dt_root(void) | |
775 | { | |
e6a6928c | 776 | return 0; |
57d00ecf SN |
777 | } |
778 | ||
c0556d3f RH |
779 | /** |
780 | * of_get_flat_dt_size - Return the total size of the FDT | |
781 | */ | |
782 | int __init of_get_flat_dt_size(void) | |
783 | { | |
784 | return fdt_totalsize(initial_boot_params); | |
785 | } | |
786 | ||
57d00ecf SN |
787 | /** |
788 | * of_get_flat_dt_prop - Given a node in the flat blob, return the property ptr | |
789 | * | |
790 | * This function can be used within scan_flattened_dt callback to get | |
791 | * access to properties | |
792 | */ | |
9d0c4dfe RH |
793 | const void *__init of_get_flat_dt_prop(unsigned long node, const char *name, |
794 | int *size) | |
57d00ecf | 795 | { |
e6a6928c | 796 | return fdt_getprop(initial_boot_params, node, name, size); |
57d00ecf SN |
797 | } |
798 | ||
799 | /** | |
800 | * of_flat_dt_is_compatible - Return true if given node has compat in compatible list | |
801 | * @node: node to test | |
802 | * @compat: compatible string to compare with compatible list. | |
803 | */ | |
804 | int __init of_flat_dt_is_compatible(unsigned long node, const char *compat) | |
805 | { | |
806 | return of_fdt_is_compatible(initial_boot_params, node, compat); | |
807 | } | |
808 | ||
a4f740cf GL |
809 | /** |
810 | * of_flat_dt_match - Return true if node matches a list of compatible values | |
811 | */ | |
7b482c83 | 812 | int __init of_flat_dt_match(unsigned long node, const char *const *compat) |
a4f740cf GL |
813 | { |
814 | return of_fdt_match(initial_boot_params, node, compat); | |
815 | } | |
816 | ||
ea47dd19 NP |
817 | /** |
818 | * of_get_flat_dt_prop - Given a node in the flat blob, return the phandle | |
819 | */ | |
820 | uint32_t __init of_get_flat_dt_phandle(unsigned long node) | |
821 | { | |
822 | return fdt_get_phandle(initial_boot_params, node); | |
823 | } | |
824 | ||
57d74bcf MS |
825 | struct fdt_scan_status { |
826 | const char *name; | |
827 | int namelen; | |
828 | int depth; | |
829 | int found; | |
830 | int (*iterator)(unsigned long node, const char *uname, int depth, void *data); | |
831 | void *data; | |
832 | }; | |
833 | ||
6a903a25 RH |
834 | const char * __init of_flat_dt_get_machine_name(void) |
835 | { | |
836 | const char *name; | |
837 | unsigned long dt_root = of_get_flat_dt_root(); | |
838 | ||
839 | name = of_get_flat_dt_prop(dt_root, "model", NULL); | |
840 | if (!name) | |
841 | name = of_get_flat_dt_prop(dt_root, "compatible", NULL); | |
842 | return name; | |
843 | } | |
844 | ||
845 | /** | |
846 | * of_flat_dt_match_machine - Iterate match tables to find matching machine. | |
847 | * | |
848 | * @default_match: A machine specific ptr to return in case of no match. | |
849 | * @get_next_compat: callback function to return next compatible match table. | |
850 | * | |
851 | * Iterate through machine match tables to find the best match for the machine | |
852 | * compatible string in the FDT. | |
853 | */ | |
854 | const void * __init of_flat_dt_match_machine(const void *default_match, | |
855 | const void * (*get_next_compat)(const char * const**)) | |
856 | { | |
857 | const void *data = NULL; | |
858 | const void *best_data = default_match; | |
859 | const char *const *compat; | |
860 | unsigned long dt_root; | |
861 | unsigned int best_score = ~1, score = 0; | |
862 | ||
863 | dt_root = of_get_flat_dt_root(); | |
864 | while ((data = get_next_compat(&compat))) { | |
865 | score = of_flat_dt_match(dt_root, compat); | |
866 | if (score > 0 && score < best_score) { | |
867 | best_data = data; | |
868 | best_score = score; | |
869 | } | |
870 | } | |
871 | if (!best_data) { | |
872 | const char *prop; | |
9d0c4dfe | 873 | int size; |
6a903a25 RH |
874 | |
875 | pr_err("\n unrecognized device tree list:\n[ "); | |
876 | ||
877 | prop = of_get_flat_dt_prop(dt_root, "compatible", &size); | |
878 | if (prop) { | |
879 | while (size > 0) { | |
880 | printk("'%s' ", prop); | |
881 | size -= strlen(prop) + 1; | |
882 | prop += strlen(prop) + 1; | |
883 | } | |
884 | } | |
885 | printk("]\n\n"); | |
886 | return NULL; | |
887 | } | |
888 | ||
889 | pr_info("Machine model: %s\n", of_flat_dt_get_machine_name()); | |
890 | ||
891 | return best_data; | |
892 | } | |
893 | ||
f7b3a835 | 894 | #ifdef CONFIG_BLK_DEV_INITRD |
369bc9ab AB |
895 | #ifndef __early_init_dt_declare_initrd |
896 | static void __early_init_dt_declare_initrd(unsigned long start, | |
897 | unsigned long end) | |
898 | { | |
899 | initrd_start = (unsigned long)__va(start); | |
900 | initrd_end = (unsigned long)__va(end); | |
901 | initrd_below_start_ok = 1; | |
902 | } | |
903 | #endif | |
904 | ||
f7b3a835 GL |
905 | /** |
906 | * early_init_dt_check_for_initrd - Decode initrd location from flat tree | |
907 | * @node: reference to node containing initrd location ('chosen') | |
908 | */ | |
29eb45a9 | 909 | static void __init early_init_dt_check_for_initrd(unsigned long node) |
f7b3a835 | 910 | { |
374d5c99 | 911 | u64 start, end; |
9d0c4dfe RH |
912 | int len; |
913 | const __be32 *prop; | |
f7b3a835 GL |
914 | |
915 | pr_debug("Looking for initrd properties... "); | |
916 | ||
917 | prop = of_get_flat_dt_prop(node, "linux,initrd-start", &len); | |
1406bc2f JK |
918 | if (!prop) |
919 | return; | |
374d5c99 | 920 | start = of_read_number(prop, len/4); |
1406bc2f JK |
921 | |
922 | prop = of_get_flat_dt_prop(node, "linux,initrd-end", &len); | |
923 | if (!prop) | |
924 | return; | |
374d5c99 | 925 | end = of_read_number(prop, len/4); |
f7b3a835 | 926 | |
369bc9ab | 927 | __early_init_dt_declare_initrd(start, end); |
29eb45a9 | 928 | |
374d5c99 SS |
929 | pr_debug("initrd_start=0x%llx initrd_end=0x%llx\n", |
930 | (unsigned long long)start, (unsigned long long)end); | |
f7b3a835 GL |
931 | } |
932 | #else | |
29eb45a9 | 933 | static inline void early_init_dt_check_for_initrd(unsigned long node) |
f7b3a835 GL |
934 | { |
935 | } | |
936 | #endif /* CONFIG_BLK_DEV_INITRD */ | |
937 | ||
fb11ffe7 | 938 | #ifdef CONFIG_SERIAL_EARLYCON |
fb11ffe7 | 939 | |
d503187b | 940 | int __init early_init_dt_scan_chosen_stdout(void) |
fb11ffe7 RH |
941 | { |
942 | int offset; | |
4d118c9a | 943 | const char *p, *q, *options = NULL; |
fb11ffe7 | 944 | int l; |
dd709e72 | 945 | const struct earlycon_id **p_match; |
fb11ffe7 RH |
946 | const void *fdt = initial_boot_params; |
947 | ||
948 | offset = fdt_path_offset(fdt, "/chosen"); | |
949 | if (offset < 0) | |
950 | offset = fdt_path_offset(fdt, "/chosen@0"); | |
951 | if (offset < 0) | |
952 | return -ENOENT; | |
953 | ||
954 | p = fdt_getprop(fdt, offset, "stdout-path", &l); | |
955 | if (!p) | |
956 | p = fdt_getprop(fdt, offset, "linux,stdout-path", &l); | |
957 | if (!p || !l) | |
958 | return -ENOENT; | |
959 | ||
4d118c9a PH |
960 | q = strchrnul(p, ':'); |
961 | if (*q != '\0') | |
962 | options = q + 1; | |
0fcc286f | 963 | l = q - p; |
6296ad9e | 964 | |
fb11ffe7 | 965 | /* Get the node specified by stdout-path */ |
0fcc286f PH |
966 | offset = fdt_path_offset_namelen(fdt, p, l); |
967 | if (offset < 0) { | |
968 | pr_warn("earlycon: stdout-path %.*s not found\n", l, p); | |
969 | return 0; | |
970 | } | |
fb11ffe7 | 971 | |
dd709e72 DK |
972 | for (p_match = __earlycon_table; p_match < __earlycon_table_end; |
973 | p_match++) { | |
974 | const struct earlycon_id *match = *p_match; | |
975 | ||
2eaa7909 PH |
976 | if (!match->compatible[0]) |
977 | continue; | |
978 | ||
979 | if (fdt_node_check_compatible(fdt, offset, match->compatible)) | |
fb11ffe7 | 980 | continue; |
fb11ffe7 | 981 | |
c90fe9c0 | 982 | of_setup_earlycon(match, offset, options); |
fb11ffe7 RH |
983 | return 0; |
984 | } | |
985 | return -ENODEV; | |
986 | } | |
fb11ffe7 RH |
987 | #endif |
988 | ||
f00abd94 GL |
989 | /** |
990 | * early_init_dt_scan_root - fetch the top level address and size cells | |
991 | */ | |
992 | int __init early_init_dt_scan_root(unsigned long node, const char *uname, | |
993 | int depth, void *data) | |
994 | { | |
9d0c4dfe | 995 | const __be32 *prop; |
f00abd94 GL |
996 | |
997 | if (depth != 0) | |
998 | return 0; | |
999 | ||
33714881 JK |
1000 | dt_root_size_cells = OF_ROOT_NODE_SIZE_CELLS_DEFAULT; |
1001 | dt_root_addr_cells = OF_ROOT_NODE_ADDR_CELLS_DEFAULT; | |
1002 | ||
f00abd94 | 1003 | prop = of_get_flat_dt_prop(node, "#size-cells", NULL); |
33714881 JK |
1004 | if (prop) |
1005 | dt_root_size_cells = be32_to_cpup(prop); | |
f00abd94 GL |
1006 | pr_debug("dt_root_size_cells = %x\n", dt_root_size_cells); |
1007 | ||
1008 | prop = of_get_flat_dt_prop(node, "#address-cells", NULL); | |
33714881 JK |
1009 | if (prop) |
1010 | dt_root_addr_cells = be32_to_cpup(prop); | |
f00abd94 GL |
1011 | pr_debug("dt_root_addr_cells = %x\n", dt_root_addr_cells); |
1012 | ||
1013 | /* break now */ | |
1014 | return 1; | |
1015 | } | |
1016 | ||
9d0c4dfe | 1017 | u64 __init dt_mem_next_cell(int s, const __be32 **cellp) |
83f7a06e | 1018 | { |
9d0c4dfe | 1019 | const __be32 *p = *cellp; |
83f7a06e GL |
1020 | |
1021 | *cellp = p + s; | |
1022 | return of_read_number(p, s); | |
1023 | } | |
1024 | ||
51975db0 | 1025 | /** |
0ef5adca | 1026 | * early_init_dt_scan_memory - Look for and parse memory nodes |
51975db0 GL |
1027 | */ |
1028 | int __init early_init_dt_scan_memory(unsigned long node, const char *uname, | |
1029 | int depth, void *data) | |
1030 | { | |
9d0c4dfe RH |
1031 | const char *type = of_get_flat_dt_prop(node, "device_type", NULL); |
1032 | const __be32 *reg, *endp; | |
1033 | int l; | |
41a9ada3 | 1034 | bool hotpluggable; |
51975db0 GL |
1035 | |
1036 | /* We are scanning "memory" nodes only */ | |
da653130 | 1037 | if (type == NULL || strcmp(type, "memory") != 0) |
51975db0 GL |
1038 | return 0; |
1039 | ||
1040 | reg = of_get_flat_dt_prop(node, "linux,usable-memory", &l); | |
1041 | if (reg == NULL) | |
1042 | reg = of_get_flat_dt_prop(node, "reg", &l); | |
1043 | if (reg == NULL) | |
1044 | return 0; | |
1045 | ||
1046 | endp = reg + (l / sizeof(__be32)); | |
41a9ada3 | 1047 | hotpluggable = of_get_flat_dt_prop(node, "hotpluggable", NULL); |
51975db0 | 1048 | |
c954b36e | 1049 | pr_debug("memory scan node %s, reg size %d,\n", uname, l); |
51975db0 GL |
1050 | |
1051 | while ((endp - reg) >= (dt_root_addr_cells + dt_root_size_cells)) { | |
1052 | u64 base, size; | |
1053 | ||
1054 | base = dt_mem_next_cell(dt_root_addr_cells, ®); | |
1055 | size = dt_mem_next_cell(dt_root_size_cells, ®); | |
1056 | ||
1057 | if (size == 0) | |
1058 | continue; | |
1059 | pr_debug(" - %llx , %llx\n", (unsigned long long)base, | |
1060 | (unsigned long long)size); | |
1061 | ||
1062 | early_init_dt_add_memory_arch(base, size); | |
41a9ada3 RA |
1063 | |
1064 | if (!hotpluggable) | |
1065 | continue; | |
1066 | ||
1067 | if (early_init_dt_mark_hotplug_memory_arch(base, size)) | |
1068 | pr_warn("failed to mark hotplug range 0x%llx - 0x%llx\n", | |
1069 | base, base + size); | |
51975db0 GL |
1070 | } |
1071 | ||
1072 | return 0; | |
1073 | } | |
1074 | ||
86e03221 GL |
1075 | int __init early_init_dt_scan_chosen(unsigned long node, const char *uname, |
1076 | int depth, void *data) | |
1077 | { | |
9d0c4dfe RH |
1078 | int l; |
1079 | const char *p; | |
86e03221 GL |
1080 | |
1081 | pr_debug("search \"chosen\", depth: %d, uname: %s\n", depth, uname); | |
1082 | ||
85f60ae4 | 1083 | if (depth != 1 || !data || |
86e03221 GL |
1084 | (strcmp(uname, "chosen") != 0 && strcmp(uname, "chosen@0") != 0)) |
1085 | return 0; | |
1086 | ||
1087 | early_init_dt_check_for_initrd(node); | |
1088 | ||
25985edc | 1089 | /* Retrieve command line */ |
86e03221 GL |
1090 | p = of_get_flat_dt_prop(node, "bootargs", &l); |
1091 | if (p != NULL && l > 0) | |
85f60ae4 | 1092 | strlcpy(data, p, min((int)l, COMMAND_LINE_SIZE)); |
86e03221 | 1093 | |
78b782cb BH |
1094 | /* |
1095 | * CONFIG_CMDLINE is meant to be a default in case nothing else | |
1096 | * managed to set the command line, unless CONFIG_CMDLINE_FORCE | |
1097 | * is set in which case we override whatever was found earlier. | |
1098 | */ | |
86e03221 | 1099 | #ifdef CONFIG_CMDLINE |
34b82026 MU |
1100 | #if defined(CONFIG_CMDLINE_EXTEND) |
1101 | strlcat(data, " ", COMMAND_LINE_SIZE); | |
1102 | strlcat(data, CONFIG_CMDLINE, COMMAND_LINE_SIZE); | |
1103 | #elif defined(CONFIG_CMDLINE_FORCE) | |
1104 | strlcpy(data, CONFIG_CMDLINE, COMMAND_LINE_SIZE); | |
1105 | #else | |
1106 | /* No arguments from boot loader, use kernel's cmdl*/ | |
78b782cb | 1107 | if (!((char *)data)[0]) |
85f60ae4 | 1108 | strlcpy(data, CONFIG_CMDLINE, COMMAND_LINE_SIZE); |
34b82026 | 1109 | #endif |
86e03221 GL |
1110 | #endif /* CONFIG_CMDLINE */ |
1111 | ||
85f60ae4 | 1112 | pr_debug("Command line is: %s\n", (char*)data); |
86e03221 GL |
1113 | |
1114 | /* break now */ | |
1115 | return 1; | |
1116 | } | |
1117 | ||
a1727da5 | 1118 | #ifdef CONFIG_HAVE_MEMBLOCK |
270522a0 AB |
1119 | #ifndef MIN_MEMBLOCK_ADDR |
1120 | #define MIN_MEMBLOCK_ADDR __pa(PAGE_OFFSET) | |
1121 | #endif | |
8eafeb48 AB |
1122 | #ifndef MAX_MEMBLOCK_ADDR |
1123 | #define MAX_MEMBLOCK_ADDR ((phys_addr_t)~0) | |
1124 | #endif | |
3069f0c0 | 1125 | |
068f6310 RH |
1126 | void __init __weak early_init_dt_add_memory_arch(u64 base, u64 size) |
1127 | { | |
270522a0 | 1128 | const u64 phys_offset = MIN_MEMBLOCK_ADDR; |
8f73d4b7 GU |
1129 | |
1130 | if (!PAGE_ALIGNED(base)) { | |
8cccffc5 AB |
1131 | if (size < PAGE_SIZE - (base & ~PAGE_MASK)) { |
1132 | pr_warn("Ignoring memory block 0x%llx - 0x%llx\n", | |
1133 | base, base + size); | |
1134 | return; | |
1135 | } | |
8f73d4b7 GU |
1136 | size -= PAGE_SIZE - (base & ~PAGE_MASK); |
1137 | base = PAGE_ALIGN(base); | |
1138 | } | |
068f6310 | 1139 | size &= PAGE_MASK; |
a67a6ed1 | 1140 | |
8eafeb48 | 1141 | if (base > MAX_MEMBLOCK_ADDR) { |
3069f0c0 LA |
1142 | pr_warning("Ignoring memory block 0x%llx - 0x%llx\n", |
1143 | base, base + size); | |
1144 | return; | |
1145 | } | |
a67a6ed1 | 1146 | |
8eafeb48 | 1147 | if (base + size - 1 > MAX_MEMBLOCK_ADDR) { |
9aacd602 | 1148 | pr_warning("Ignoring memory range 0x%llx - 0x%llx\n", |
8eafeb48 AB |
1149 | ((u64)MAX_MEMBLOCK_ADDR) + 1, base + size); |
1150 | size = MAX_MEMBLOCK_ADDR - base + 1; | |
a67a6ed1 LA |
1151 | } |
1152 | ||
068f6310 RH |
1153 | if (base + size < phys_offset) { |
1154 | pr_warning("Ignoring memory block 0x%llx - 0x%llx\n", | |
1155 | base, base + size); | |
1156 | return; | |
1157 | } | |
1158 | if (base < phys_offset) { | |
1159 | pr_warning("Ignoring memory range 0x%llx - 0x%llx\n", | |
1160 | base, phys_offset); | |
1161 | size -= phys_offset - base; | |
1162 | base = phys_offset; | |
1163 | } | |
1164 | memblock_add(base, size); | |
1165 | } | |
1166 | ||
41a9ada3 RA |
1167 | int __init __weak early_init_dt_mark_hotplug_memory_arch(u64 base, u64 size) |
1168 | { | |
1169 | return memblock_mark_hotplug(base, size); | |
1170 | } | |
1171 | ||
e8d9d1f5 MS |
1172 | int __init __weak early_init_dt_reserve_memory_arch(phys_addr_t base, |
1173 | phys_addr_t size, bool nomap) | |
1174 | { | |
e8d9d1f5 MS |
1175 | if (nomap) |
1176 | return memblock_remove(base, size); | |
1177 | return memblock_reserve(base, size); | |
1178 | } | |
1179 | ||
e8d9d1f5 | 1180 | #else |
aefc7ec2 RH |
1181 | void __init __weak early_init_dt_add_memory_arch(u64 base, u64 size) |
1182 | { | |
1183 | WARN_ON(1); | |
1184 | } | |
1185 | ||
41a9ada3 RA |
1186 | int __init __weak early_init_dt_mark_hotplug_memory_arch(u64 base, u64 size) |
1187 | { | |
1188 | return -ENOSYS; | |
1189 | } | |
1190 | ||
e8d9d1f5 MS |
1191 | int __init __weak early_init_dt_reserve_memory_arch(phys_addr_t base, |
1192 | phys_addr_t size, bool nomap) | |
1193 | { | |
78bb2abe | 1194 | pr_err("Reserved memory not supported, ignoring range %pa - %pa%s\n", |
1d1a661d | 1195 | &base, &size, nomap ? " (nomap)" : ""); |
e8d9d1f5 MS |
1196 | return -ENOSYS; |
1197 | } | |
0fa1c579 | 1198 | #endif |
aefc7ec2 | 1199 | |
0fa1c579 | 1200 | static void * __init early_init_dt_alloc_memory_arch(u64 size, u64 align) |
aefc7ec2 | 1201 | { |
0fa1c579 | 1202 | return memblock_virt_alloc(size, align); |
aefc7ec2 | 1203 | } |
a1727da5 | 1204 | |
4972a74b | 1205 | bool __init early_init_dt_verify(void *params) |
0288ffcb RH |
1206 | { |
1207 | if (!params) | |
1208 | return false; | |
1209 | ||
0288ffcb | 1210 | /* check device tree validity */ |
50ba08f3 | 1211 | if (fdt_check_header(params)) |
0288ffcb | 1212 | return false; |
0288ffcb | 1213 | |
50ba08f3 BH |
1214 | /* Setup flat device-tree pointer */ |
1215 | initial_boot_params = params; | |
08d53aa5 AB |
1216 | of_fdt_crc32 = crc32_be(~0, initial_boot_params, |
1217 | fdt_totalsize(initial_boot_params)); | |
4972a74b LA |
1218 | return true; |
1219 | } | |
1220 | ||
1221 | ||
1222 | void __init early_init_dt_scan_nodes(void) | |
1223 | { | |
0288ffcb RH |
1224 | /* Retrieve various information from the /chosen node */ |
1225 | of_scan_flat_dt(early_init_dt_scan_chosen, boot_command_line); | |
1226 | ||
1227 | /* Initialize {size,address}-cells info */ | |
1228 | of_scan_flat_dt(early_init_dt_scan_root, NULL); | |
1229 | ||
1230 | /* Setup memory, calling early_init_dt_add_memory_arch */ | |
1231 | of_scan_flat_dt(early_init_dt_scan_memory, NULL); | |
4972a74b LA |
1232 | } |
1233 | ||
1234 | bool __init early_init_dt_scan(void *params) | |
1235 | { | |
1236 | bool status; | |
1237 | ||
1238 | status = early_init_dt_verify(params); | |
1239 | if (!status) | |
1240 | return false; | |
0288ffcb | 1241 | |
4972a74b | 1242 | early_init_dt_scan_nodes(); |
0288ffcb RH |
1243 | return true; |
1244 | } | |
1245 | ||
41f88009 GL |
1246 | /** |
1247 | * unflatten_device_tree - create tree of device_nodes from flat blob | |
1248 | * | |
1249 | * unflattens the device-tree passed by the firmware, creating the | |
1250 | * tree of struct device_node. It also fills the "name" and "type" | |
1251 | * pointers of the nodes so the normal device-tree walking functions | |
1252 | * can be used. | |
1253 | */ | |
1254 | void __init unflatten_device_tree(void) | |
1255 | { | |
c4263233 | 1256 | __unflatten_device_tree(initial_boot_params, NULL, &of_root, |
1d1bde55 | 1257 | early_init_dt_alloc_memory_arch, false); |
41f88009 | 1258 | |
4c7d6361 | 1259 | /* Get pointer to "/chosen" and "/aliases" nodes for use everywhere */ |
611cad72 | 1260 | of_alias_scan(early_init_dt_alloc_memory_arch); |
81d0848f FR |
1261 | |
1262 | unittest_unflatten_overlay_base(); | |
41f88009 | 1263 | } |
e6ce1324 | 1264 | |
a8bf7527 RH |
1265 | /** |
1266 | * unflatten_and_copy_device_tree - copy and create tree of device_nodes from flat blob | |
1267 | * | |
1268 | * Copies and unflattens the device-tree passed by the firmware, creating the | |
1269 | * tree of struct device_node. It also fills the "name" and "type" | |
1270 | * pointers of the nodes so the normal device-tree walking functions | |
1271 | * can be used. This should only be used when the FDT memory has not been | |
1272 | * reserved such is the case when the FDT is built-in to the kernel init | |
1273 | * section. If the FDT memory is reserved already then unflatten_device_tree | |
1274 | * should be used instead. | |
1275 | */ | |
1276 | void __init unflatten_and_copy_device_tree(void) | |
1277 | { | |
6f041e99 JH |
1278 | int size; |
1279 | void *dt; | |
1280 | ||
1281 | if (!initial_boot_params) { | |
1282 | pr_warn("No valid device tree found, continuing without\n"); | |
1283 | return; | |
1284 | } | |
1285 | ||
c972de14 | 1286 | size = fdt_totalsize(initial_boot_params); |
6f041e99 | 1287 | dt = early_init_dt_alloc_memory_arch(size, |
c972de14 | 1288 | roundup_pow_of_two(FDT_V17_SIZE)); |
a8bf7527 RH |
1289 | |
1290 | if (dt) { | |
1291 | memcpy(dt, initial_boot_params, size); | |
1292 | initial_boot_params = dt; | |
1293 | } | |
1294 | unflatten_device_tree(); | |
1295 | } | |
1296 | ||
08d53aa5 AB |
1297 | #ifdef CONFIG_SYSFS |
1298 | static ssize_t of_fdt_raw_read(struct file *filp, struct kobject *kobj, | |
1299 | struct bin_attribute *bin_attr, | |
1300 | char *buf, loff_t off, size_t count) | |
b0a6fb36 | 1301 | { |
08d53aa5 AB |
1302 | memcpy(buf, initial_boot_params + off, count); |
1303 | return count; | |
1304 | } | |
b0a6fb36 | 1305 | |
08d53aa5 AB |
1306 | static int __init of_fdt_raw_init(void) |
1307 | { | |
1308 | static struct bin_attribute of_fdt_raw_attr = | |
1309 | __BIN_ATTR(fdt, S_IRUSR, of_fdt_raw_read, NULL, 0); | |
b0a6fb36 | 1310 | |
08d53aa5 AB |
1311 | if (!initial_boot_params) |
1312 | return 0; | |
b0a6fb36 | 1313 | |
08d53aa5 AB |
1314 | if (of_fdt_crc32 != crc32_be(~0, initial_boot_params, |
1315 | fdt_totalsize(initial_boot_params))) { | |
606ad42a | 1316 | pr_warn("not creating '/sys/firmware/fdt': CRC check failed\n"); |
08d53aa5 AB |
1317 | return 0; |
1318 | } | |
1319 | of_fdt_raw_attr.size = fdt_totalsize(initial_boot_params); | |
1320 | return sysfs_create_bin_file(firmware_kobj, &of_fdt_raw_attr); | |
b0a6fb36 | 1321 | } |
08d53aa5 | 1322 | late_initcall(of_fdt_raw_init); |
b0a6fb36 RH |
1323 | #endif |
1324 | ||
e6ce1324 | 1325 | #endif /* CONFIG_OF_EARLY_FLATTREE */ |