Commit | Line | Data |
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e169cfbe GL |
1 | /* |
2 | * Functions for working with the Flattened Device Tree data format | |
3 | * | |
4 | * Copyright 2009 Benjamin Herrenschmidt, IBM Corp | |
5 | * benh@kernel.crashing.org | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or | |
8 | * modify it under the terms of the GNU General Public License | |
9 | * version 2 as published by the Free Software Foundation. | |
10 | */ | |
11 | ||
08d53aa5 | 12 | #include <linux/crc32.h> |
41f88009 | 13 | #include <linux/kernel.h> |
f7b3a835 | 14 | #include <linux/initrd.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 | ||
704033ce LA |
32 | /* |
33 | * of_fdt_limit_memory - limit the number of regions in the /memory node | |
34 | * @limit: maximum entries | |
35 | * | |
36 | * Adjust the flattened device tree to have at most 'limit' number of | |
37 | * memory entries in the /memory node. This function may be called | |
38 | * any time after initial_boot_param is set. | |
39 | */ | |
40 | void of_fdt_limit_memory(int limit) | |
41 | { | |
42 | int memory; | |
43 | int len; | |
44 | const void *val; | |
45 | int nr_address_cells = OF_ROOT_NODE_ADDR_CELLS_DEFAULT; | |
46 | int nr_size_cells = OF_ROOT_NODE_SIZE_CELLS_DEFAULT; | |
47 | const uint32_t *addr_prop; | |
48 | const uint32_t *size_prop; | |
49 | int root_offset; | |
50 | int cell_size; | |
51 | ||
52 | root_offset = fdt_path_offset(initial_boot_params, "/"); | |
53 | if (root_offset < 0) | |
54 | return; | |
55 | ||
56 | addr_prop = fdt_getprop(initial_boot_params, root_offset, | |
57 | "#address-cells", NULL); | |
58 | if (addr_prop) | |
59 | nr_address_cells = fdt32_to_cpu(*addr_prop); | |
60 | ||
61 | size_prop = fdt_getprop(initial_boot_params, root_offset, | |
62 | "#size-cells", NULL); | |
63 | if (size_prop) | |
64 | nr_size_cells = fdt32_to_cpu(*size_prop); | |
65 | ||
66 | cell_size = sizeof(uint32_t)*(nr_address_cells + nr_size_cells); | |
67 | ||
68 | memory = fdt_path_offset(initial_boot_params, "/memory"); | |
69 | if (memory > 0) { | |
70 | val = fdt_getprop(initial_boot_params, memory, "reg", &len); | |
71 | if (len > limit*cell_size) { | |
72 | len = limit*cell_size; | |
73 | pr_debug("Limiting number of entries to %d\n", limit); | |
74 | fdt_setprop(initial_boot_params, memory, "reg", val, | |
75 | len); | |
76 | } | |
77 | } | |
78 | } | |
79 | ||
9706a36e SN |
80 | /** |
81 | * of_fdt_is_compatible - Return true if given node from the given blob has | |
82 | * compat in its compatible list | |
83 | * @blob: A device tree blob | |
84 | * @node: node to test | |
85 | * @compat: compatible string to compare with compatible list. | |
a4f740cf GL |
86 | * |
87 | * On match, returns a non-zero value with smaller values returned for more | |
88 | * specific compatible values. | |
9706a36e | 89 | */ |
c972de14 | 90 | int of_fdt_is_compatible(const void *blob, |
9706a36e SN |
91 | unsigned long node, const char *compat) |
92 | { | |
93 | const char *cp; | |
9d0c4dfe RH |
94 | int cplen; |
95 | unsigned long l, score = 0; | |
9706a36e | 96 | |
e6a6928c | 97 | cp = fdt_getprop(blob, node, "compatible", &cplen); |
9706a36e SN |
98 | if (cp == NULL) |
99 | return 0; | |
100 | while (cplen > 0) { | |
a4f740cf | 101 | score++; |
9706a36e | 102 | if (of_compat_cmp(cp, compat, strlen(compat)) == 0) |
a4f740cf | 103 | return score; |
9706a36e SN |
104 | l = strlen(cp) + 1; |
105 | cp += l; | |
106 | cplen -= l; | |
107 | } | |
108 | ||
109 | return 0; | |
110 | } | |
111 | ||
cc783786 KC |
112 | /** |
113 | * of_fdt_is_big_endian - Return true if given node needs BE MMIO accesses | |
114 | * @blob: A device tree blob | |
115 | * @node: node to test | |
116 | * | |
117 | * Returns true if the node has a "big-endian" property, or if the kernel | |
118 | * was compiled for BE *and* the node has a "native-endian" property. | |
119 | * Returns false otherwise. | |
120 | */ | |
121 | bool of_fdt_is_big_endian(const void *blob, unsigned long node) | |
122 | { | |
123 | if (fdt_getprop(blob, node, "big-endian", NULL)) | |
124 | return true; | |
125 | if (IS_ENABLED(CONFIG_CPU_BIG_ENDIAN) && | |
126 | fdt_getprop(blob, node, "native-endian", NULL)) | |
127 | return true; | |
128 | return false; | |
129 | } | |
130 | ||
a4f740cf GL |
131 | /** |
132 | * of_fdt_match - Return true if node matches a list of compatible values | |
133 | */ | |
c972de14 | 134 | int of_fdt_match(const void *blob, unsigned long node, |
7b482c83 | 135 | const char *const *compat) |
a4f740cf GL |
136 | { |
137 | unsigned int tmp, score = 0; | |
138 | ||
139 | if (!compat) | |
140 | return 0; | |
141 | ||
142 | while (*compat) { | |
143 | tmp = of_fdt_is_compatible(blob, node, *compat); | |
144 | if (tmp && (score == 0 || (tmp < score))) | |
145 | score = tmp; | |
146 | compat++; | |
147 | } | |
148 | ||
149 | return score; | |
150 | } | |
151 | ||
44856819 | 152 | static void *unflatten_dt_alloc(void **mem, unsigned long size, |
bbd33931 GL |
153 | unsigned long align) |
154 | { | |
155 | void *res; | |
156 | ||
44856819 GL |
157 | *mem = PTR_ALIGN(*mem, align); |
158 | res = *mem; | |
bbd33931 GL |
159 | *mem += size; |
160 | ||
161 | return res; | |
162 | } | |
163 | ||
164 | /** | |
165 | * unflatten_dt_node - Alloc and populate a device_node from the flat tree | |
a40d6c4c | 166 | * @blob: The parent device tree blob |
a7006c97 | 167 | * @mem: Memory chunk to use for allocating device nodes and properties |
ce32f859 | 168 | * @poffset: pointer to node in flat tree |
bbd33931 | 169 | * @dad: Parent struct device_node |
ce32f859 | 170 | * @nodepp: The device_node tree created by the call |
bbd33931 | 171 | * @fpsize: Size of the node path up at the current depth. |
ce32f859 MY |
172 | * @dryrun: If true, do not allocate device nodes but still calculate needed |
173 | * memory size | |
bbd33931 | 174 | */ |
3b1a2c97 | 175 | static void * unflatten_dt_node(const void *blob, |
44856819 | 176 | void *mem, |
e6a6928c | 177 | int *poffset, |
a40d6c4c | 178 | struct device_node *dad, |
5063e25a GL |
179 | struct device_node **nodepp, |
180 | unsigned long fpsize, | |
181 | bool dryrun) | |
bbd33931 | 182 | { |
e6a6928c | 183 | const __be32 *p; |
bbd33931 GL |
184 | struct device_node *np; |
185 | struct property *pp, **prev_pp = NULL; | |
e6a6928c | 186 | const char *pathp; |
bbd33931 | 187 | unsigned int l, allocl; |
0b13ea8e | 188 | static int depth; |
e6a6928c RH |
189 | int old_depth; |
190 | int offset; | |
bbd33931 GL |
191 | int has_name = 0; |
192 | int new_format = 0; | |
193 | ||
e6a6928c RH |
194 | pathp = fdt_get_name(blob, *poffset, &l); |
195 | if (!pathp) | |
bbd33931 | 196 | return mem; |
e6a6928c | 197 | |
05f4647b | 198 | allocl = ++l; |
bbd33931 GL |
199 | |
200 | /* version 0x10 has a more compact unit name here instead of the full | |
201 | * path. we accumulate the full path size using "fpsize", we'll rebuild | |
202 | * it later. We detect this because the first character of the name is | |
203 | * not '/'. | |
204 | */ | |
205 | if ((*pathp) != '/') { | |
206 | new_format = 1; | |
207 | if (fpsize == 0) { | |
208 | /* root node: special case. fpsize accounts for path | |
209 | * plus terminating zero. root node only has '/', so | |
210 | * fpsize should be 2, but we want to avoid the first | |
211 | * level nodes to have two '/' so we use fpsize 1 here | |
212 | */ | |
213 | fpsize = 1; | |
214 | allocl = 2; | |
0fca5dea | 215 | l = 1; |
e6a6928c | 216 | pathp = ""; |
bbd33931 GL |
217 | } else { |
218 | /* account for '/' and path size minus terminal 0 | |
219 | * already in 'l' | |
220 | */ | |
221 | fpsize += l; | |
222 | allocl = fpsize; | |
223 | } | |
224 | } | |
225 | ||
226 | np = unflatten_dt_alloc(&mem, sizeof(struct device_node) + allocl, | |
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); |
bbd33931 | 232 | if (new_format) { |
bbd33931 GL |
233 | /* rebuild full path for new format */ |
234 | if (dad && dad->parent) { | |
235 | strcpy(fn, dad->full_name); | |
236 | #ifdef DEBUG | |
237 | if ((strlen(fn) + l + 1) != allocl) { | |
238 | pr_debug("%s: p: %d, l: %d, a: %d\n", | |
239 | pathp, (int)strlen(fn), | |
240 | l, allocl); | |
241 | } | |
242 | #endif | |
243 | fn += strlen(fn); | |
244 | } | |
245 | *(fn++) = '/'; | |
c22618a1 GL |
246 | } |
247 | memcpy(fn, pathp, l); | |
248 | ||
bbd33931 | 249 | prev_pp = &np->properties; |
bbd33931 GL |
250 | if (dad != NULL) { |
251 | np->parent = dad; | |
70161ff3 GL |
252 | np->sibling = dad->child; |
253 | dad->child = np; | |
bbd33931 | 254 | } |
bbd33931 | 255 | } |
a7006c97 | 256 | /* process properties */ |
e6a6928c RH |
257 | for (offset = fdt_first_property_offset(blob, *poffset); |
258 | (offset >= 0); | |
259 | (offset = fdt_next_property_offset(blob, offset))) { | |
260 | const char *pname; | |
261 | u32 sz; | |
262 | ||
263 | if (!(p = fdt_getprop_by_offset(blob, offset, &pname, &sz))) { | |
264 | offset = -FDT_ERR_INTERNAL; | |
bbd33931 | 265 | break; |
e6a6928c RH |
266 | } |
267 | ||
bbd33931 GL |
268 | if (pname == NULL) { |
269 | pr_info("Can't find property name in list !\n"); | |
270 | break; | |
271 | } | |
272 | if (strcmp(pname, "name") == 0) | |
273 | has_name = 1; | |
bbd33931 GL |
274 | pp = unflatten_dt_alloc(&mem, sizeof(struct property), |
275 | __alignof__(struct property)); | |
5063e25a | 276 | if (!dryrun) { |
04b954a6 DG |
277 | /* We accept flattened tree phandles either in |
278 | * ePAPR-style "phandle" properties, or the | |
279 | * legacy "linux,phandle" properties. If both | |
280 | * appear and have different values, things | |
281 | * will get weird. Don't do that. */ | |
282 | if ((strcmp(pname, "phandle") == 0) || | |
283 | (strcmp(pname, "linux,phandle") == 0)) { | |
6016a363 | 284 | if (np->phandle == 0) |
e6a6928c | 285 | np->phandle = be32_to_cpup(p); |
bbd33931 | 286 | } |
04b954a6 DG |
287 | /* And we process the "ibm,phandle" property |
288 | * used in pSeries dynamic device tree | |
289 | * stuff */ | |
bbd33931 | 290 | if (strcmp(pname, "ibm,phandle") == 0) |
e6a6928c RH |
291 | np->phandle = be32_to_cpup(p); |
292 | pp->name = (char *)pname; | |
bbd33931 | 293 | pp->length = sz; |
e6a6928c | 294 | pp->value = (__be32 *)p; |
bbd33931 GL |
295 | *prev_pp = pp; |
296 | prev_pp = &pp->next; | |
297 | } | |
bbd33931 GL |
298 | } |
299 | /* with version 0x10 we may not have the name property, recreate | |
300 | * it here from the unit name if absent | |
301 | */ | |
302 | if (!has_name) { | |
e6a6928c | 303 | const char *p1 = pathp, *ps = pathp, *pa = NULL; |
bbd33931 GL |
304 | int sz; |
305 | ||
306 | while (*p1) { | |
307 | if ((*p1) == '@') | |
308 | pa = p1; | |
309 | if ((*p1) == '/') | |
310 | ps = p1 + 1; | |
311 | p1++; | |
312 | } | |
313 | if (pa < ps) | |
314 | pa = p1; | |
315 | sz = (pa - ps) + 1; | |
316 | pp = unflatten_dt_alloc(&mem, sizeof(struct property) + sz, | |
317 | __alignof__(struct property)); | |
5063e25a | 318 | if (!dryrun) { |
bbd33931 GL |
319 | pp->name = "name"; |
320 | pp->length = sz; | |
321 | pp->value = pp + 1; | |
322 | *prev_pp = pp; | |
323 | prev_pp = &pp->next; | |
324 | memcpy(pp->value, ps, sz - 1); | |
325 | ((char *)pp->value)[sz - 1] = 0; | |
326 | pr_debug("fixed up name for %s -> %s\n", pathp, | |
327 | (char *)pp->value); | |
328 | } | |
329 | } | |
5063e25a | 330 | if (!dryrun) { |
bbd33931 GL |
331 | *prev_pp = NULL; |
332 | np->name = of_get_property(np, "name", NULL); | |
333 | np->type = of_get_property(np, "device_type", NULL); | |
334 | ||
335 | if (!np->name) | |
336 | np->name = "<NULL>"; | |
337 | if (!np->type) | |
338 | np->type = "<NULL>"; | |
339 | } | |
e6a6928c RH |
340 | |
341 | old_depth = depth; | |
342 | *poffset = fdt_next_node(blob, *poffset, &depth); | |
343 | if (depth < 0) | |
344 | depth = 0; | |
345 | while (*poffset > 0 && depth > old_depth) | |
5063e25a GL |
346 | mem = unflatten_dt_node(blob, mem, poffset, np, NULL, |
347 | fpsize, dryrun); | |
e6a6928c RH |
348 | |
349 | if (*poffset < 0 && *poffset != -FDT_ERR_NOTFOUND) | |
350 | pr_err("unflatten: error %d processing FDT\n", *poffset); | |
351 | ||
70161ff3 GL |
352 | /* |
353 | * Reverse the child list. Some drivers assumes node order matches .dts | |
354 | * node order | |
355 | */ | |
356 | if (!dryrun && np->child) { | |
357 | struct device_node *child = np->child; | |
358 | np->child = NULL; | |
359 | while (child) { | |
360 | struct device_node *next = child->sibling; | |
361 | child->sibling = np->child; | |
362 | np->child = child; | |
363 | child = next; | |
364 | } | |
365 | } | |
366 | ||
5063e25a GL |
367 | if (nodepp) |
368 | *nodepp = np; | |
e6a6928c | 369 | |
bbd33931 GL |
370 | return mem; |
371 | } | |
41f88009 | 372 | |
fe140423 SN |
373 | /** |
374 | * __unflatten_device_tree - create tree of device_nodes from flat blob | |
375 | * | |
376 | * unflattens a device-tree, creating the | |
377 | * tree of struct device_node. It also fills the "name" and "type" | |
378 | * pointers of the nodes so the normal device-tree walking functions | |
379 | * can be used. | |
380 | * @blob: The blob to expand | |
381 | * @mynodes: The device_node tree created by the call | |
382 | * @dt_alloc: An allocator that provides a virtual address to memory | |
383 | * for the resulting tree | |
384 | */ | |
3b1a2c97 | 385 | static void __unflatten_device_tree(const void *blob, |
fe140423 SN |
386 | struct device_node **mynodes, |
387 | void * (*dt_alloc)(u64 size, u64 align)) | |
388 | { | |
44856819 | 389 | unsigned long size; |
e6a6928c RH |
390 | int start; |
391 | void *mem; | |
fe140423 SN |
392 | |
393 | pr_debug(" -> unflatten_device_tree()\n"); | |
394 | ||
395 | if (!blob) { | |
396 | pr_debug("No device tree pointer\n"); | |
397 | return; | |
398 | } | |
399 | ||
400 | pr_debug("Unflattening device tree:\n"); | |
c972de14 RH |
401 | pr_debug("magic: %08x\n", fdt_magic(blob)); |
402 | pr_debug("size: %08x\n", fdt_totalsize(blob)); | |
403 | pr_debug("version: %08x\n", fdt_version(blob)); | |
fe140423 | 404 | |
c972de14 | 405 | if (fdt_check_header(blob)) { |
fe140423 SN |
406 | pr_err("Invalid device tree blob header\n"); |
407 | return; | |
408 | } | |
409 | ||
410 | /* First pass, scan for size */ | |
e6a6928c | 411 | start = 0; |
5063e25a | 412 | size = (unsigned long)unflatten_dt_node(blob, NULL, &start, NULL, NULL, 0, true); |
44856819 | 413 | size = ALIGN(size, 4); |
fe140423 SN |
414 | |
415 | pr_debug(" size is %lx, allocating...\n", size); | |
416 | ||
417 | /* Allocate memory for the expanded device tree */ | |
44856819 GL |
418 | mem = dt_alloc(size + 4, __alignof__(struct device_node)); |
419 | memset(mem, 0, size); | |
fe140423 | 420 | |
44856819 | 421 | *(__be32 *)(mem + size) = cpu_to_be32(0xdeadbeef); |
9e401275 | 422 | |
44856819 | 423 | pr_debug(" unflattening %p...\n", mem); |
fe140423 SN |
424 | |
425 | /* Second pass, do actual unflattening */ | |
e6a6928c | 426 | start = 0; |
5063e25a | 427 | unflatten_dt_node(blob, mem, &start, NULL, mynodes, 0, false); |
44856819 | 428 | if (be32_to_cpup(mem + size) != 0xdeadbeef) |
fe140423 | 429 | pr_warning("End of tree marker overwritten: %08x\n", |
44856819 | 430 | be32_to_cpup(mem + size)); |
fe140423 SN |
431 | |
432 | pr_debug(" <- unflatten_device_tree()\n"); | |
433 | } | |
434 | ||
435 | static void *kernel_tree_alloc(u64 size, u64 align) | |
436 | { | |
437 | return kzalloc(size, GFP_KERNEL); | |
438 | } | |
439 | ||
f8062386 GR |
440 | static DEFINE_MUTEX(of_fdt_unflatten_mutex); |
441 | ||
fe140423 SN |
442 | /** |
443 | * of_fdt_unflatten_tree - create tree of device_nodes from flat blob | |
444 | * | |
445 | * unflattens the device-tree passed by the firmware, creating the | |
446 | * tree of struct device_node. It also fills the "name" and "type" | |
447 | * pointers of the nodes so the normal device-tree walking functions | |
448 | * can be used. | |
449 | */ | |
3b1a2c97 | 450 | void of_fdt_unflatten_tree(const unsigned long *blob, |
fe140423 SN |
451 | struct device_node **mynodes) |
452 | { | |
f8062386 | 453 | mutex_lock(&of_fdt_unflatten_mutex); |
c972de14 | 454 | __unflatten_device_tree(blob, mynodes, &kernel_tree_alloc); |
f8062386 | 455 | mutex_unlock(&of_fdt_unflatten_mutex); |
fe140423 SN |
456 | } |
457 | EXPORT_SYMBOL_GPL(of_fdt_unflatten_tree); | |
458 | ||
57d00ecf SN |
459 | /* Everything below here references initial_boot_params directly. */ |
460 | int __initdata dt_root_addr_cells; | |
461 | int __initdata dt_root_size_cells; | |
462 | ||
1daa0c4c | 463 | void *initial_boot_params; |
57d00ecf SN |
464 | |
465 | #ifdef CONFIG_OF_EARLY_FLATTREE | |
466 | ||
08d53aa5 AB |
467 | static u32 of_fdt_crc32; |
468 | ||
e8d9d1f5 MS |
469 | /** |
470 | * res_mem_reserve_reg() - reserve all memory described in 'reg' property | |
471 | */ | |
472 | static int __init __reserved_mem_reserve_reg(unsigned long node, | |
473 | const char *uname) | |
474 | { | |
475 | int t_len = (dt_root_addr_cells + dt_root_size_cells) * sizeof(__be32); | |
476 | phys_addr_t base, size; | |
9d0c4dfe RH |
477 | int len; |
478 | const __be32 *prop; | |
3f0c8206 | 479 | int nomap, first = 1; |
e8d9d1f5 MS |
480 | |
481 | prop = of_get_flat_dt_prop(node, "reg", &len); | |
482 | if (!prop) | |
483 | return -ENOENT; | |
484 | ||
485 | if (len && len % t_len != 0) { | |
486 | pr_err("Reserved memory: invalid reg property in '%s', skipping node.\n", | |
487 | uname); | |
488 | return -EINVAL; | |
489 | } | |
490 | ||
491 | nomap = of_get_flat_dt_prop(node, "no-map", NULL) != NULL; | |
492 | ||
493 | while (len >= t_len) { | |
494 | base = dt_mem_next_cell(dt_root_addr_cells, &prop); | |
495 | size = dt_mem_next_cell(dt_root_size_cells, &prop); | |
496 | ||
b5f2a8c0 | 497 | if (size && |
e8d9d1f5 MS |
498 | early_init_dt_reserve_memory_arch(base, size, nomap) == 0) |
499 | pr_debug("Reserved memory: reserved region for node '%s': base %pa, size %ld MiB\n", | |
500 | uname, &base, (unsigned long)size / SZ_1M); | |
501 | else | |
502 | pr_info("Reserved memory: failed to reserve memory for node '%s': base %pa, size %ld MiB\n", | |
503 | uname, &base, (unsigned long)size / SZ_1M); | |
504 | ||
505 | len -= t_len; | |
3f0c8206 MS |
506 | if (first) { |
507 | fdt_reserved_mem_save_node(node, uname, base, size); | |
508 | first = 0; | |
509 | } | |
e8d9d1f5 MS |
510 | } |
511 | return 0; | |
512 | } | |
513 | ||
514 | /** | |
515 | * __reserved_mem_check_root() - check if #size-cells, #address-cells provided | |
516 | * in /reserved-memory matches the values supported by the current implementation, | |
517 | * also check if ranges property has been provided | |
518 | */ | |
5b624118 | 519 | static int __init __reserved_mem_check_root(unsigned long node) |
e8d9d1f5 | 520 | { |
9d0c4dfe | 521 | const __be32 *prop; |
e8d9d1f5 MS |
522 | |
523 | prop = of_get_flat_dt_prop(node, "#size-cells", NULL); | |
524 | if (!prop || be32_to_cpup(prop) != dt_root_size_cells) | |
525 | return -EINVAL; | |
526 | ||
527 | prop = of_get_flat_dt_prop(node, "#address-cells", NULL); | |
528 | if (!prop || be32_to_cpup(prop) != dt_root_addr_cells) | |
529 | return -EINVAL; | |
530 | ||
531 | prop = of_get_flat_dt_prop(node, "ranges", NULL); | |
532 | if (!prop) | |
533 | return -EINVAL; | |
534 | return 0; | |
535 | } | |
536 | ||
537 | /** | |
538 | * fdt_scan_reserved_mem() - scan a single FDT node for reserved memory | |
539 | */ | |
540 | static int __init __fdt_scan_reserved_mem(unsigned long node, const char *uname, | |
541 | int depth, void *data) | |
542 | { | |
543 | static int found; | |
544 | const char *status; | |
3f0c8206 | 545 | int err; |
e8d9d1f5 MS |
546 | |
547 | if (!found && depth == 1 && strcmp(uname, "reserved-memory") == 0) { | |
548 | if (__reserved_mem_check_root(node) != 0) { | |
549 | pr_err("Reserved memory: unsupported node format, ignoring\n"); | |
550 | /* break scan */ | |
551 | return 1; | |
552 | } | |
553 | found = 1; | |
554 | /* scan next node */ | |
555 | return 0; | |
556 | } else if (!found) { | |
557 | /* scan next node */ | |
558 | return 0; | |
559 | } else if (found && depth < 2) { | |
560 | /* scanning of /reserved-memory has been finished */ | |
561 | return 1; | |
562 | } | |
563 | ||
564 | status = of_get_flat_dt_prop(node, "status", NULL); | |
565 | if (status && strcmp(status, "okay") != 0 && strcmp(status, "ok") != 0) | |
566 | return 0; | |
567 | ||
3f0c8206 MS |
568 | err = __reserved_mem_reserve_reg(node, uname); |
569 | if (err == -ENOENT && of_get_flat_dt_prop(node, "size", NULL)) | |
570 | fdt_reserved_mem_save_node(node, uname, 0, 0); | |
e8d9d1f5 MS |
571 | |
572 | /* scan next node */ | |
573 | return 0; | |
574 | } | |
575 | ||
576 | /** | |
577 | * early_init_fdt_scan_reserved_mem() - create reserved memory regions | |
578 | * | |
579 | * This function grabs memory from early allocator for device exclusive use | |
580 | * defined in device tree structures. It should be called by arch specific code | |
581 | * once the early allocator (i.e. memblock) has been fully activated. | |
582 | */ | |
583 | void __init early_init_fdt_scan_reserved_mem(void) | |
584 | { | |
d1552ce4 RH |
585 | int n; |
586 | u64 base, size; | |
587 | ||
2040b527 JC |
588 | if (!initial_boot_params) |
589 | return; | |
590 | ||
d1552ce4 RH |
591 | /* Process header /memreserve/ fields */ |
592 | for (n = 0; ; n++) { | |
593 | fdt_get_mem_rsv(initial_boot_params, n, &base, &size); | |
594 | if (!size) | |
595 | break; | |
596 | early_init_dt_reserve_memory_arch(base, size, 0); | |
597 | } | |
598 | ||
e8d9d1f5 | 599 | of_scan_flat_dt(__fdt_scan_reserved_mem, NULL); |
3f0c8206 | 600 | fdt_init_reserved_mem(); |
e8d9d1f5 MS |
601 | } |
602 | ||
24bbd929 AB |
603 | /** |
604 | * early_init_fdt_reserve_self() - reserve the memory used by the FDT blob | |
605 | */ | |
606 | void __init early_init_fdt_reserve_self(void) | |
607 | { | |
608 | if (!initial_boot_params) | |
609 | return; | |
610 | ||
611 | /* Reserve the dtb region */ | |
612 | early_init_dt_reserve_memory_arch(__pa(initial_boot_params), | |
613 | fdt_totalsize(initial_boot_params), | |
614 | 0); | |
615 | } | |
616 | ||
57d00ecf SN |
617 | /** |
618 | * of_scan_flat_dt - scan flattened tree blob and call callback on each. | |
619 | * @it: callback function | |
620 | * @data: context data pointer | |
621 | * | |
622 | * This function is used to scan the flattened device-tree, it is | |
623 | * used to extract the memory information at boot before we can | |
624 | * unflatten the tree | |
625 | */ | |
626 | int __init of_scan_flat_dt(int (*it)(unsigned long node, | |
627 | const char *uname, int depth, | |
628 | void *data), | |
629 | void *data) | |
630 | { | |
e6a6928c RH |
631 | const void *blob = initial_boot_params; |
632 | const char *pathp; | |
633 | int offset, rc = 0, depth = -1; | |
634 | ||
635 | for (offset = fdt_next_node(blob, -1, &depth); | |
636 | offset >= 0 && depth >= 0 && !rc; | |
637 | offset = fdt_next_node(blob, offset, &depth)) { | |
638 | ||
639 | pathp = fdt_get_name(blob, offset, NULL); | |
375da3a7 AS |
640 | if (*pathp == '/') |
641 | pathp = kbasename(pathp); | |
e6a6928c RH |
642 | rc = it(offset, pathp, depth, data); |
643 | } | |
57d00ecf SN |
644 | return rc; |
645 | } | |
646 | ||
647 | /** | |
648 | * of_get_flat_dt_root - find the root node in the flat blob | |
649 | */ | |
650 | unsigned long __init of_get_flat_dt_root(void) | |
651 | { | |
e6a6928c | 652 | return 0; |
57d00ecf SN |
653 | } |
654 | ||
c0556d3f RH |
655 | /** |
656 | * of_get_flat_dt_size - Return the total size of the FDT | |
657 | */ | |
658 | int __init of_get_flat_dt_size(void) | |
659 | { | |
660 | return fdt_totalsize(initial_boot_params); | |
661 | } | |
662 | ||
57d00ecf SN |
663 | /** |
664 | * of_get_flat_dt_prop - Given a node in the flat blob, return the property ptr | |
665 | * | |
666 | * This function can be used within scan_flattened_dt callback to get | |
667 | * access to properties | |
668 | */ | |
9d0c4dfe RH |
669 | const void *__init of_get_flat_dt_prop(unsigned long node, const char *name, |
670 | int *size) | |
57d00ecf | 671 | { |
e6a6928c | 672 | return fdt_getprop(initial_boot_params, node, name, size); |
57d00ecf SN |
673 | } |
674 | ||
675 | /** | |
676 | * of_flat_dt_is_compatible - Return true if given node has compat in compatible list | |
677 | * @node: node to test | |
678 | * @compat: compatible string to compare with compatible list. | |
679 | */ | |
680 | int __init of_flat_dt_is_compatible(unsigned long node, const char *compat) | |
681 | { | |
682 | return of_fdt_is_compatible(initial_boot_params, node, compat); | |
683 | } | |
684 | ||
a4f740cf GL |
685 | /** |
686 | * of_flat_dt_match - Return true if node matches a list of compatible values | |
687 | */ | |
7b482c83 | 688 | int __init of_flat_dt_match(unsigned long node, const char *const *compat) |
a4f740cf GL |
689 | { |
690 | return of_fdt_match(initial_boot_params, node, compat); | |
691 | } | |
692 | ||
57d74bcf MS |
693 | struct fdt_scan_status { |
694 | const char *name; | |
695 | int namelen; | |
696 | int depth; | |
697 | int found; | |
698 | int (*iterator)(unsigned long node, const char *uname, int depth, void *data); | |
699 | void *data; | |
700 | }; | |
701 | ||
6a903a25 RH |
702 | const char * __init of_flat_dt_get_machine_name(void) |
703 | { | |
704 | const char *name; | |
705 | unsigned long dt_root = of_get_flat_dt_root(); | |
706 | ||
707 | name = of_get_flat_dt_prop(dt_root, "model", NULL); | |
708 | if (!name) | |
709 | name = of_get_flat_dt_prop(dt_root, "compatible", NULL); | |
710 | return name; | |
711 | } | |
712 | ||
713 | /** | |
714 | * of_flat_dt_match_machine - Iterate match tables to find matching machine. | |
715 | * | |
716 | * @default_match: A machine specific ptr to return in case of no match. | |
717 | * @get_next_compat: callback function to return next compatible match table. | |
718 | * | |
719 | * Iterate through machine match tables to find the best match for the machine | |
720 | * compatible string in the FDT. | |
721 | */ | |
722 | const void * __init of_flat_dt_match_machine(const void *default_match, | |
723 | const void * (*get_next_compat)(const char * const**)) | |
724 | { | |
725 | const void *data = NULL; | |
726 | const void *best_data = default_match; | |
727 | const char *const *compat; | |
728 | unsigned long dt_root; | |
729 | unsigned int best_score = ~1, score = 0; | |
730 | ||
731 | dt_root = of_get_flat_dt_root(); | |
732 | while ((data = get_next_compat(&compat))) { | |
733 | score = of_flat_dt_match(dt_root, compat); | |
734 | if (score > 0 && score < best_score) { | |
735 | best_data = data; | |
736 | best_score = score; | |
737 | } | |
738 | } | |
739 | if (!best_data) { | |
740 | const char *prop; | |
9d0c4dfe | 741 | int size; |
6a903a25 RH |
742 | |
743 | pr_err("\n unrecognized device tree list:\n[ "); | |
744 | ||
745 | prop = of_get_flat_dt_prop(dt_root, "compatible", &size); | |
746 | if (prop) { | |
747 | while (size > 0) { | |
748 | printk("'%s' ", prop); | |
749 | size -= strlen(prop) + 1; | |
750 | prop += strlen(prop) + 1; | |
751 | } | |
752 | } | |
753 | printk("]\n\n"); | |
754 | return NULL; | |
755 | } | |
756 | ||
757 | pr_info("Machine model: %s\n", of_flat_dt_get_machine_name()); | |
758 | ||
759 | return best_data; | |
760 | } | |
761 | ||
f7b3a835 GL |
762 | #ifdef CONFIG_BLK_DEV_INITRD |
763 | /** | |
764 | * early_init_dt_check_for_initrd - Decode initrd location from flat tree | |
765 | * @node: reference to node containing initrd location ('chosen') | |
766 | */ | |
29eb45a9 | 767 | static void __init early_init_dt_check_for_initrd(unsigned long node) |
f7b3a835 | 768 | { |
374d5c99 | 769 | u64 start, end; |
9d0c4dfe RH |
770 | int len; |
771 | const __be32 *prop; | |
f7b3a835 GL |
772 | |
773 | pr_debug("Looking for initrd properties... "); | |
774 | ||
775 | prop = of_get_flat_dt_prop(node, "linux,initrd-start", &len); | |
1406bc2f JK |
776 | if (!prop) |
777 | return; | |
374d5c99 | 778 | start = of_read_number(prop, len/4); |
1406bc2f JK |
779 | |
780 | prop = of_get_flat_dt_prop(node, "linux,initrd-end", &len); | |
781 | if (!prop) | |
782 | return; | |
374d5c99 | 783 | end = of_read_number(prop, len/4); |
f7b3a835 | 784 | |
29eb45a9 RH |
785 | initrd_start = (unsigned long)__va(start); |
786 | initrd_end = (unsigned long)__va(end); | |
787 | initrd_below_start_ok = 1; | |
788 | ||
374d5c99 SS |
789 | pr_debug("initrd_start=0x%llx initrd_end=0x%llx\n", |
790 | (unsigned long long)start, (unsigned long long)end); | |
f7b3a835 GL |
791 | } |
792 | #else | |
29eb45a9 | 793 | static inline void early_init_dt_check_for_initrd(unsigned long node) |
f7b3a835 GL |
794 | { |
795 | } | |
796 | #endif /* CONFIG_BLK_DEV_INITRD */ | |
797 | ||
fb11ffe7 RH |
798 | #ifdef CONFIG_SERIAL_EARLYCON |
799 | extern struct of_device_id __earlycon_of_table[]; | |
800 | ||
523bf17f | 801 | static int __init early_init_dt_scan_chosen_serial(void) |
fb11ffe7 RH |
802 | { |
803 | int offset; | |
804 | const char *p; | |
805 | int l; | |
806 | const struct of_device_id *match = __earlycon_of_table; | |
807 | const void *fdt = initial_boot_params; | |
808 | ||
809 | offset = fdt_path_offset(fdt, "/chosen"); | |
810 | if (offset < 0) | |
811 | offset = fdt_path_offset(fdt, "/chosen@0"); | |
812 | if (offset < 0) | |
813 | return -ENOENT; | |
814 | ||
815 | p = fdt_getprop(fdt, offset, "stdout-path", &l); | |
816 | if (!p) | |
817 | p = fdt_getprop(fdt, offset, "linux,stdout-path", &l); | |
818 | if (!p || !l) | |
819 | return -ENOENT; | |
820 | ||
6296ad9e SA |
821 | /* Remove console options if present */ |
822 | l = strchrnul(p, ':') - p; | |
823 | ||
fb11ffe7 | 824 | /* Get the node specified by stdout-path */ |
6296ad9e | 825 | offset = fdt_path_offset_namelen(fdt, p, l); |
fb11ffe7 RH |
826 | if (offset < 0) |
827 | return -ENODEV; | |
828 | ||
ab74d00a | 829 | while (match->compatible[0]) { |
3f5ceec9 MY |
830 | u64 addr; |
831 | ||
fb11ffe7 RH |
832 | if (fdt_node_check_compatible(fdt, offset, match->compatible)) { |
833 | match++; | |
834 | continue; | |
835 | } | |
836 | ||
837 | addr = fdt_translate_address(fdt, offset); | |
3f5ceec9 | 838 | if (addr == OF_BAD_ADDR) |
fb11ffe7 RH |
839 | return -ENXIO; |
840 | ||
841 | of_setup_earlycon(addr, match->data); | |
842 | return 0; | |
843 | } | |
844 | return -ENODEV; | |
845 | } | |
846 | ||
847 | static int __init setup_of_earlycon(char *buf) | |
848 | { | |
849 | if (buf) | |
850 | return 0; | |
851 | ||
852 | return early_init_dt_scan_chosen_serial(); | |
853 | } | |
854 | early_param("earlycon", setup_of_earlycon); | |
855 | #endif | |
856 | ||
f00abd94 GL |
857 | /** |
858 | * early_init_dt_scan_root - fetch the top level address and size cells | |
859 | */ | |
860 | int __init early_init_dt_scan_root(unsigned long node, const char *uname, | |
861 | int depth, void *data) | |
862 | { | |
9d0c4dfe | 863 | const __be32 *prop; |
f00abd94 GL |
864 | |
865 | if (depth != 0) | |
866 | return 0; | |
867 | ||
33714881 JK |
868 | dt_root_size_cells = OF_ROOT_NODE_SIZE_CELLS_DEFAULT; |
869 | dt_root_addr_cells = OF_ROOT_NODE_ADDR_CELLS_DEFAULT; | |
870 | ||
f00abd94 | 871 | prop = of_get_flat_dt_prop(node, "#size-cells", NULL); |
33714881 JK |
872 | if (prop) |
873 | dt_root_size_cells = be32_to_cpup(prop); | |
f00abd94 GL |
874 | pr_debug("dt_root_size_cells = %x\n", dt_root_size_cells); |
875 | ||
876 | prop = of_get_flat_dt_prop(node, "#address-cells", NULL); | |
33714881 JK |
877 | if (prop) |
878 | dt_root_addr_cells = be32_to_cpup(prop); | |
f00abd94 GL |
879 | pr_debug("dt_root_addr_cells = %x\n", dt_root_addr_cells); |
880 | ||
881 | /* break now */ | |
882 | return 1; | |
883 | } | |
884 | ||
9d0c4dfe | 885 | u64 __init dt_mem_next_cell(int s, const __be32 **cellp) |
83f7a06e | 886 | { |
9d0c4dfe | 887 | const __be32 *p = *cellp; |
83f7a06e GL |
888 | |
889 | *cellp = p + s; | |
890 | return of_read_number(p, s); | |
891 | } | |
892 | ||
51975db0 GL |
893 | /** |
894 | * early_init_dt_scan_memory - Look for an parse memory nodes | |
895 | */ | |
896 | int __init early_init_dt_scan_memory(unsigned long node, const char *uname, | |
897 | int depth, void *data) | |
898 | { | |
9d0c4dfe RH |
899 | const char *type = of_get_flat_dt_prop(node, "device_type", NULL); |
900 | const __be32 *reg, *endp; | |
901 | int l; | |
51975db0 GL |
902 | |
903 | /* We are scanning "memory" nodes only */ | |
904 | if (type == NULL) { | |
905 | /* | |
906 | * The longtrail doesn't have a device_type on the | |
907 | * /memory node, so look for the node called /memory@0. | |
908 | */ | |
b44aa25d | 909 | if (!IS_ENABLED(CONFIG_PPC32) || depth != 1 || strcmp(uname, "memory@0") != 0) |
51975db0 GL |
910 | return 0; |
911 | } else if (strcmp(type, "memory") != 0) | |
912 | return 0; | |
913 | ||
914 | reg = of_get_flat_dt_prop(node, "linux,usable-memory", &l); | |
915 | if (reg == NULL) | |
916 | reg = of_get_flat_dt_prop(node, "reg", &l); | |
917 | if (reg == NULL) | |
918 | return 0; | |
919 | ||
920 | endp = reg + (l / sizeof(__be32)); | |
921 | ||
c954b36e | 922 | pr_debug("memory scan node %s, reg size %d,\n", uname, l); |
51975db0 GL |
923 | |
924 | while ((endp - reg) >= (dt_root_addr_cells + dt_root_size_cells)) { | |
925 | u64 base, size; | |
926 | ||
927 | base = dt_mem_next_cell(dt_root_addr_cells, ®); | |
928 | size = dt_mem_next_cell(dt_root_size_cells, ®); | |
929 | ||
930 | if (size == 0) | |
931 | continue; | |
932 | pr_debug(" - %llx , %llx\n", (unsigned long long)base, | |
933 | (unsigned long long)size); | |
934 | ||
935 | early_init_dt_add_memory_arch(base, size); | |
936 | } | |
937 | ||
938 | return 0; | |
939 | } | |
940 | ||
86e03221 GL |
941 | int __init early_init_dt_scan_chosen(unsigned long node, const char *uname, |
942 | int depth, void *data) | |
943 | { | |
9d0c4dfe RH |
944 | int l; |
945 | const char *p; | |
86e03221 GL |
946 | |
947 | pr_debug("search \"chosen\", depth: %d, uname: %s\n", depth, uname); | |
948 | ||
85f60ae4 | 949 | if (depth != 1 || !data || |
86e03221 GL |
950 | (strcmp(uname, "chosen") != 0 && strcmp(uname, "chosen@0") != 0)) |
951 | return 0; | |
952 | ||
953 | early_init_dt_check_for_initrd(node); | |
954 | ||
25985edc | 955 | /* Retrieve command line */ |
86e03221 GL |
956 | p = of_get_flat_dt_prop(node, "bootargs", &l); |
957 | if (p != NULL && l > 0) | |
85f60ae4 | 958 | strlcpy(data, p, min((int)l, COMMAND_LINE_SIZE)); |
86e03221 | 959 | |
78b782cb BH |
960 | /* |
961 | * CONFIG_CMDLINE is meant to be a default in case nothing else | |
962 | * managed to set the command line, unless CONFIG_CMDLINE_FORCE | |
963 | * is set in which case we override whatever was found earlier. | |
964 | */ | |
86e03221 GL |
965 | #ifdef CONFIG_CMDLINE |
966 | #ifndef CONFIG_CMDLINE_FORCE | |
78b782cb | 967 | if (!((char *)data)[0]) |
86e03221 | 968 | #endif |
85f60ae4 | 969 | strlcpy(data, CONFIG_CMDLINE, COMMAND_LINE_SIZE); |
86e03221 GL |
970 | #endif /* CONFIG_CMDLINE */ |
971 | ||
85f60ae4 | 972 | pr_debug("Command line is: %s\n", (char*)data); |
86e03221 GL |
973 | |
974 | /* break now */ | |
975 | return 1; | |
976 | } | |
977 | ||
a1727da5 | 978 | #ifdef CONFIG_HAVE_MEMBLOCK |
8eafeb48 AB |
979 | #ifndef MAX_MEMBLOCK_ADDR |
980 | #define MAX_MEMBLOCK_ADDR ((phys_addr_t)~0) | |
981 | #endif | |
3069f0c0 | 982 | |
068f6310 RH |
983 | void __init __weak early_init_dt_add_memory_arch(u64 base, u64 size) |
984 | { | |
985 | const u64 phys_offset = __pa(PAGE_OFFSET); | |
8f73d4b7 GU |
986 | |
987 | if (!PAGE_ALIGNED(base)) { | |
8cccffc5 AB |
988 | if (size < PAGE_SIZE - (base & ~PAGE_MASK)) { |
989 | pr_warn("Ignoring memory block 0x%llx - 0x%llx\n", | |
990 | base, base + size); | |
991 | return; | |
992 | } | |
8f73d4b7 GU |
993 | size -= PAGE_SIZE - (base & ~PAGE_MASK); |
994 | base = PAGE_ALIGN(base); | |
995 | } | |
068f6310 | 996 | size &= PAGE_MASK; |
a67a6ed1 | 997 | |
8eafeb48 | 998 | if (base > MAX_MEMBLOCK_ADDR) { |
3069f0c0 LA |
999 | pr_warning("Ignoring memory block 0x%llx - 0x%llx\n", |
1000 | base, base + size); | |
1001 | return; | |
1002 | } | |
a67a6ed1 | 1003 | |
8eafeb48 | 1004 | if (base + size - 1 > MAX_MEMBLOCK_ADDR) { |
9aacd602 | 1005 | pr_warning("Ignoring memory range 0x%llx - 0x%llx\n", |
8eafeb48 AB |
1006 | ((u64)MAX_MEMBLOCK_ADDR) + 1, base + size); |
1007 | size = MAX_MEMBLOCK_ADDR - base + 1; | |
a67a6ed1 LA |
1008 | } |
1009 | ||
068f6310 RH |
1010 | if (base + size < phys_offset) { |
1011 | pr_warning("Ignoring memory block 0x%llx - 0x%llx\n", | |
1012 | base, base + size); | |
1013 | return; | |
1014 | } | |
1015 | if (base < phys_offset) { | |
1016 | pr_warning("Ignoring memory range 0x%llx - 0x%llx\n", | |
1017 | base, phys_offset); | |
1018 | size -= phys_offset - base; | |
1019 | base = phys_offset; | |
1020 | } | |
1021 | memblock_add(base, size); | |
1022 | } | |
1023 | ||
e8d9d1f5 MS |
1024 | int __init __weak early_init_dt_reserve_memory_arch(phys_addr_t base, |
1025 | phys_addr_t size, bool nomap) | |
1026 | { | |
e8d9d1f5 MS |
1027 | if (nomap) |
1028 | return memblock_remove(base, size); | |
1029 | return memblock_reserve(base, size); | |
1030 | } | |
1031 | ||
a1727da5 GL |
1032 | /* |
1033 | * called from unflatten_device_tree() to bootstrap devicetree itself | |
1034 | * Architectures can override this definition if memblock isn't used | |
1035 | */ | |
1036 | void * __init __weak early_init_dt_alloc_memory_arch(u64 size, u64 align) | |
1037 | { | |
1038 | return __va(memblock_alloc(size, align)); | |
1039 | } | |
e8d9d1f5 | 1040 | #else |
aefc7ec2 RH |
1041 | void __init __weak early_init_dt_add_memory_arch(u64 base, u64 size) |
1042 | { | |
1043 | WARN_ON(1); | |
1044 | } | |
1045 | ||
e8d9d1f5 MS |
1046 | int __init __weak early_init_dt_reserve_memory_arch(phys_addr_t base, |
1047 | phys_addr_t size, bool nomap) | |
1048 | { | |
78bb2abe | 1049 | pr_err("Reserved memory not supported, ignoring range %pa - %pa%s\n", |
1d1a661d | 1050 | &base, &size, nomap ? " (nomap)" : ""); |
e8d9d1f5 MS |
1051 | return -ENOSYS; |
1052 | } | |
aefc7ec2 RH |
1053 | |
1054 | void * __init __weak early_init_dt_alloc_memory_arch(u64 size, u64 align) | |
1055 | { | |
1056 | WARN_ON(1); | |
1057 | return NULL; | |
1058 | } | |
a1727da5 GL |
1059 | #endif |
1060 | ||
4972a74b | 1061 | bool __init early_init_dt_verify(void *params) |
0288ffcb RH |
1062 | { |
1063 | if (!params) | |
1064 | return false; | |
1065 | ||
0288ffcb | 1066 | /* check device tree validity */ |
50ba08f3 | 1067 | if (fdt_check_header(params)) |
0288ffcb | 1068 | return false; |
0288ffcb | 1069 | |
50ba08f3 BH |
1070 | /* Setup flat device-tree pointer */ |
1071 | initial_boot_params = params; | |
08d53aa5 AB |
1072 | of_fdt_crc32 = crc32_be(~0, initial_boot_params, |
1073 | fdt_totalsize(initial_boot_params)); | |
4972a74b LA |
1074 | return true; |
1075 | } | |
1076 | ||
1077 | ||
1078 | void __init early_init_dt_scan_nodes(void) | |
1079 | { | |
0288ffcb RH |
1080 | /* Retrieve various information from the /chosen node */ |
1081 | of_scan_flat_dt(early_init_dt_scan_chosen, boot_command_line); | |
1082 | ||
1083 | /* Initialize {size,address}-cells info */ | |
1084 | of_scan_flat_dt(early_init_dt_scan_root, NULL); | |
1085 | ||
1086 | /* Setup memory, calling early_init_dt_add_memory_arch */ | |
1087 | of_scan_flat_dt(early_init_dt_scan_memory, NULL); | |
4972a74b LA |
1088 | } |
1089 | ||
1090 | bool __init early_init_dt_scan(void *params) | |
1091 | { | |
1092 | bool status; | |
1093 | ||
1094 | status = early_init_dt_verify(params); | |
1095 | if (!status) | |
1096 | return false; | |
0288ffcb | 1097 | |
4972a74b | 1098 | early_init_dt_scan_nodes(); |
0288ffcb RH |
1099 | return true; |
1100 | } | |
1101 | ||
41f88009 GL |
1102 | /** |
1103 | * unflatten_device_tree - create tree of device_nodes from flat blob | |
1104 | * | |
1105 | * unflattens the device-tree passed by the firmware, creating the | |
1106 | * tree of struct device_node. It also fills the "name" and "type" | |
1107 | * pointers of the nodes so the normal device-tree walking functions | |
1108 | * can be used. | |
1109 | */ | |
1110 | void __init unflatten_device_tree(void) | |
1111 | { | |
5063e25a | 1112 | __unflatten_device_tree(initial_boot_params, &of_root, |
672c5446 | 1113 | early_init_dt_alloc_memory_arch); |
41f88009 | 1114 | |
4c7d6361 | 1115 | /* Get pointer to "/chosen" and "/aliases" nodes for use everywhere */ |
611cad72 | 1116 | of_alias_scan(early_init_dt_alloc_memory_arch); |
41f88009 | 1117 | } |
e6ce1324 | 1118 | |
a8bf7527 RH |
1119 | /** |
1120 | * unflatten_and_copy_device_tree - copy and create tree of device_nodes from flat blob | |
1121 | * | |
1122 | * Copies and unflattens the device-tree passed by the firmware, creating the | |
1123 | * tree of struct device_node. It also fills the "name" and "type" | |
1124 | * pointers of the nodes so the normal device-tree walking functions | |
1125 | * can be used. This should only be used when the FDT memory has not been | |
1126 | * reserved such is the case when the FDT is built-in to the kernel init | |
1127 | * section. If the FDT memory is reserved already then unflatten_device_tree | |
1128 | * should be used instead. | |
1129 | */ | |
1130 | void __init unflatten_and_copy_device_tree(void) | |
1131 | { | |
6f041e99 JH |
1132 | int size; |
1133 | void *dt; | |
1134 | ||
1135 | if (!initial_boot_params) { | |
1136 | pr_warn("No valid device tree found, continuing without\n"); | |
1137 | return; | |
1138 | } | |
1139 | ||
c972de14 | 1140 | size = fdt_totalsize(initial_boot_params); |
6f041e99 | 1141 | dt = early_init_dt_alloc_memory_arch(size, |
c972de14 | 1142 | roundup_pow_of_two(FDT_V17_SIZE)); |
a8bf7527 RH |
1143 | |
1144 | if (dt) { | |
1145 | memcpy(dt, initial_boot_params, size); | |
1146 | initial_boot_params = dt; | |
1147 | } | |
1148 | unflatten_device_tree(); | |
1149 | } | |
1150 | ||
08d53aa5 AB |
1151 | #ifdef CONFIG_SYSFS |
1152 | static ssize_t of_fdt_raw_read(struct file *filp, struct kobject *kobj, | |
1153 | struct bin_attribute *bin_attr, | |
1154 | char *buf, loff_t off, size_t count) | |
b0a6fb36 | 1155 | { |
08d53aa5 AB |
1156 | memcpy(buf, initial_boot_params + off, count); |
1157 | return count; | |
1158 | } | |
b0a6fb36 | 1159 | |
08d53aa5 AB |
1160 | static int __init of_fdt_raw_init(void) |
1161 | { | |
1162 | static struct bin_attribute of_fdt_raw_attr = | |
1163 | __BIN_ATTR(fdt, S_IRUSR, of_fdt_raw_read, NULL, 0); | |
b0a6fb36 | 1164 | |
08d53aa5 AB |
1165 | if (!initial_boot_params) |
1166 | return 0; | |
b0a6fb36 | 1167 | |
08d53aa5 AB |
1168 | if (of_fdt_crc32 != crc32_be(~0, initial_boot_params, |
1169 | fdt_totalsize(initial_boot_params))) { | |
1170 | pr_warn("fdt: not creating '/sys/firmware/fdt': CRC check failed\n"); | |
1171 | return 0; | |
1172 | } | |
1173 | of_fdt_raw_attr.size = fdt_totalsize(initial_boot_params); | |
1174 | return sysfs_create_bin_file(firmware_kobj, &of_fdt_raw_attr); | |
b0a6fb36 | 1175 | } |
08d53aa5 | 1176 | late_initcall(of_fdt_raw_init); |
b0a6fb36 RH |
1177 | #endif |
1178 | ||
e6ce1324 | 1179 | #endif /* CONFIG_OF_EARLY_FLATTREE */ |