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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 | ||
41f88009 | 12 | #include <linux/kernel.h> |
f7b3a835 | 13 | #include <linux/initrd.h> |
a1727da5 | 14 | #include <linux/memblock.h> |
fe140423 | 15 | #include <linux/module.h> |
e169cfbe GL |
16 | #include <linux/of.h> |
17 | #include <linux/of_fdt.h> | |
3f0c8206 | 18 | #include <linux/of_reserved_mem.h> |
e8d9d1f5 | 19 | #include <linux/sizes.h> |
4ef7b373 JK |
20 | #include <linux/string.h> |
21 | #include <linux/errno.h> | |
fe140423 | 22 | #include <linux/slab.h> |
51975db0 | 23 | |
c89810ac | 24 | #include <asm/setup.h> /* for COMMAND_LINE_SIZE */ |
86e03221 GL |
25 | #ifdef CONFIG_PPC |
26 | #include <asm/machdep.h> | |
27 | #endif /* CONFIG_PPC */ | |
28 | ||
4ef7b373 JK |
29 | #include <asm/page.h> |
30 | ||
9706a36e SN |
31 | char *of_fdt_get_string(struct boot_param_header *blob, u32 offset) |
32 | { | |
33 | return ((char *)blob) + | |
34 | be32_to_cpu(blob->off_dt_strings) + offset; | |
35 | } | |
36 | ||
37 | /** | |
38 | * of_fdt_get_property - Given a node in the given flat blob, return | |
39 | * the property ptr | |
40 | */ | |
41 | void *of_fdt_get_property(struct boot_param_header *blob, | |
42 | unsigned long node, const char *name, | |
43 | unsigned long *size) | |
44 | { | |
45 | unsigned long p = node; | |
46 | ||
47 | do { | |
48 | u32 tag = be32_to_cpup((__be32 *)p); | |
49 | u32 sz, noff; | |
50 | const char *nstr; | |
51 | ||
52 | p += 4; | |
53 | if (tag == OF_DT_NOP) | |
54 | continue; | |
55 | if (tag != OF_DT_PROP) | |
56 | return NULL; | |
57 | ||
58 | sz = be32_to_cpup((__be32 *)p); | |
59 | noff = be32_to_cpup((__be32 *)(p + 4)); | |
60 | p += 8; | |
61 | if (be32_to_cpu(blob->version) < 0x10) | |
62 | p = ALIGN(p, sz >= 8 ? 8 : 4); | |
63 | ||
64 | nstr = of_fdt_get_string(blob, noff); | |
65 | if (nstr == NULL) { | |
66 | pr_warning("Can't find property index name !\n"); | |
67 | return NULL; | |
68 | } | |
69 | if (strcmp(name, nstr) == 0) { | |
70 | if (size) | |
71 | *size = sz; | |
72 | return (void *)p; | |
73 | } | |
74 | p += sz; | |
75 | p = ALIGN(p, 4); | |
76 | } while (1); | |
77 | } | |
78 | ||
79 | /** | |
80 | * of_fdt_is_compatible - Return true if given node from the given blob has | |
81 | * compat in its compatible list | |
82 | * @blob: A device tree blob | |
83 | * @node: node to test | |
84 | * @compat: compatible string to compare with compatible list. | |
a4f740cf GL |
85 | * |
86 | * On match, returns a non-zero value with smaller values returned for more | |
87 | * specific compatible values. | |
9706a36e SN |
88 | */ |
89 | int of_fdt_is_compatible(struct boot_param_header *blob, | |
90 | unsigned long node, const char *compat) | |
91 | { | |
92 | const char *cp; | |
a4f740cf | 93 | unsigned long cplen, l, score = 0; |
9706a36e SN |
94 | |
95 | cp = of_fdt_get_property(blob, node, "compatible", &cplen); | |
96 | if (cp == NULL) | |
97 | return 0; | |
98 | while (cplen > 0) { | |
a4f740cf | 99 | score++; |
9706a36e | 100 | if (of_compat_cmp(cp, compat, strlen(compat)) == 0) |
a4f740cf | 101 | return score; |
9706a36e SN |
102 | l = strlen(cp) + 1; |
103 | cp += l; | |
104 | cplen -= l; | |
105 | } | |
106 | ||
107 | return 0; | |
108 | } | |
109 | ||
a4f740cf GL |
110 | /** |
111 | * of_fdt_match - Return true if node matches a list of compatible values | |
112 | */ | |
113 | int of_fdt_match(struct boot_param_header *blob, unsigned long node, | |
7b482c83 | 114 | const char *const *compat) |
a4f740cf GL |
115 | { |
116 | unsigned int tmp, score = 0; | |
117 | ||
118 | if (!compat) | |
119 | return 0; | |
120 | ||
121 | while (*compat) { | |
122 | tmp = of_fdt_is_compatible(blob, node, *compat); | |
123 | if (tmp && (score == 0 || (tmp < score))) | |
124 | score = tmp; | |
125 | compat++; | |
126 | } | |
127 | ||
128 | return score; | |
129 | } | |
130 | ||
44856819 | 131 | static void *unflatten_dt_alloc(void **mem, unsigned long size, |
bbd33931 GL |
132 | unsigned long align) |
133 | { | |
134 | void *res; | |
135 | ||
44856819 GL |
136 | *mem = PTR_ALIGN(*mem, align); |
137 | res = *mem; | |
bbd33931 GL |
138 | *mem += size; |
139 | ||
140 | return res; | |
141 | } | |
142 | ||
143 | /** | |
144 | * unflatten_dt_node - Alloc and populate a device_node from the flat tree | |
a40d6c4c | 145 | * @blob: The parent device tree blob |
a7006c97 | 146 | * @mem: Memory chunk to use for allocating device nodes and properties |
bbd33931 GL |
147 | * @p: pointer to node in flat tree |
148 | * @dad: Parent struct device_node | |
149 | * @allnextpp: pointer to ->allnext from last allocated device_node | |
150 | * @fpsize: Size of the node path up at the current depth. | |
151 | */ | |
44856819 GL |
152 | static void * unflatten_dt_node(struct boot_param_header *blob, |
153 | void *mem, | |
154 | void **p, | |
a40d6c4c SN |
155 | struct device_node *dad, |
156 | struct device_node ***allnextpp, | |
157 | unsigned long fpsize) | |
bbd33931 GL |
158 | { |
159 | struct device_node *np; | |
160 | struct property *pp, **prev_pp = NULL; | |
161 | char *pathp; | |
162 | u32 tag; | |
163 | unsigned int l, allocl; | |
164 | int has_name = 0; | |
165 | int new_format = 0; | |
166 | ||
44856819 | 167 | tag = be32_to_cpup(*p); |
bbd33931 GL |
168 | if (tag != OF_DT_BEGIN_NODE) { |
169 | pr_err("Weird tag at start of node: %x\n", tag); | |
170 | return mem; | |
171 | } | |
172 | *p += 4; | |
44856819 | 173 | pathp = *p; |
bbd33931 | 174 | l = allocl = strlen(pathp) + 1; |
44856819 | 175 | *p = PTR_ALIGN(*p + l, 4); |
bbd33931 GL |
176 | |
177 | /* version 0x10 has a more compact unit name here instead of the full | |
178 | * path. we accumulate the full path size using "fpsize", we'll rebuild | |
179 | * it later. We detect this because the first character of the name is | |
180 | * not '/'. | |
181 | */ | |
182 | if ((*pathp) != '/') { | |
183 | new_format = 1; | |
184 | if (fpsize == 0) { | |
185 | /* root node: special case. fpsize accounts for path | |
186 | * plus terminating zero. root node only has '/', so | |
187 | * fpsize should be 2, but we want to avoid the first | |
188 | * level nodes to have two '/' so we use fpsize 1 here | |
189 | */ | |
190 | fpsize = 1; | |
191 | allocl = 2; | |
0fca5dea CM |
192 | l = 1; |
193 | *pathp = '\0'; | |
bbd33931 GL |
194 | } else { |
195 | /* account for '/' and path size minus terminal 0 | |
196 | * already in 'l' | |
197 | */ | |
198 | fpsize += l; | |
199 | allocl = fpsize; | |
200 | } | |
201 | } | |
202 | ||
203 | np = unflatten_dt_alloc(&mem, sizeof(struct device_node) + allocl, | |
204 | __alignof__(struct device_node)); | |
205 | if (allnextpp) { | |
c22618a1 | 206 | char *fn; |
0829f6d1 | 207 | of_node_init(np); |
c22618a1 | 208 | np->full_name = fn = ((char *)np) + sizeof(*np); |
bbd33931 | 209 | if (new_format) { |
bbd33931 GL |
210 | /* rebuild full path for new format */ |
211 | if (dad && dad->parent) { | |
212 | strcpy(fn, dad->full_name); | |
213 | #ifdef DEBUG | |
214 | if ((strlen(fn) + l + 1) != allocl) { | |
215 | pr_debug("%s: p: %d, l: %d, a: %d\n", | |
216 | pathp, (int)strlen(fn), | |
217 | l, allocl); | |
218 | } | |
219 | #endif | |
220 | fn += strlen(fn); | |
221 | } | |
222 | *(fn++) = '/'; | |
c22618a1 GL |
223 | } |
224 | memcpy(fn, pathp, l); | |
225 | ||
bbd33931 GL |
226 | prev_pp = &np->properties; |
227 | **allnextpp = np; | |
228 | *allnextpp = &np->allnext; | |
229 | if (dad != NULL) { | |
230 | np->parent = dad; | |
231 | /* we temporarily use the next field as `last_child'*/ | |
232 | if (dad->next == NULL) | |
233 | dad->child = np; | |
234 | else | |
235 | dad->next->sibling = np; | |
236 | dad->next = np; | |
237 | } | |
bbd33931 | 238 | } |
a7006c97 | 239 | /* process properties */ |
bbd33931 GL |
240 | while (1) { |
241 | u32 sz, noff; | |
242 | char *pname; | |
243 | ||
44856819 | 244 | tag = be32_to_cpup(*p); |
bbd33931 GL |
245 | if (tag == OF_DT_NOP) { |
246 | *p += 4; | |
247 | continue; | |
248 | } | |
249 | if (tag != OF_DT_PROP) | |
250 | break; | |
251 | *p += 4; | |
44856819 GL |
252 | sz = be32_to_cpup(*p); |
253 | noff = be32_to_cpup(*p + 4); | |
bbd33931 | 254 | *p += 8; |
a40d6c4c | 255 | if (be32_to_cpu(blob->version) < 0x10) |
44856819 | 256 | *p = PTR_ALIGN(*p, sz >= 8 ? 8 : 4); |
bbd33931 | 257 | |
a40d6c4c | 258 | pname = of_fdt_get_string(blob, noff); |
bbd33931 GL |
259 | if (pname == NULL) { |
260 | pr_info("Can't find property name in list !\n"); | |
261 | break; | |
262 | } | |
263 | if (strcmp(pname, "name") == 0) | |
264 | has_name = 1; | |
265 | l = strlen(pname) + 1; | |
266 | pp = unflatten_dt_alloc(&mem, sizeof(struct property), | |
267 | __alignof__(struct property)); | |
268 | if (allnextpp) { | |
04b954a6 DG |
269 | /* We accept flattened tree phandles either in |
270 | * ePAPR-style "phandle" properties, or the | |
271 | * legacy "linux,phandle" properties. If both | |
272 | * appear and have different values, things | |
273 | * will get weird. Don't do that. */ | |
274 | if ((strcmp(pname, "phandle") == 0) || | |
275 | (strcmp(pname, "linux,phandle") == 0)) { | |
6016a363 | 276 | if (np->phandle == 0) |
9a6b2e58 | 277 | np->phandle = be32_to_cpup((__be32*)*p); |
bbd33931 | 278 | } |
04b954a6 DG |
279 | /* And we process the "ibm,phandle" property |
280 | * used in pSeries dynamic device tree | |
281 | * stuff */ | |
bbd33931 | 282 | if (strcmp(pname, "ibm,phandle") == 0) |
9a6b2e58 | 283 | np->phandle = be32_to_cpup((__be32 *)*p); |
bbd33931 GL |
284 | pp->name = pname; |
285 | pp->length = sz; | |
44856819 | 286 | pp->value = *p; |
bbd33931 GL |
287 | *prev_pp = pp; |
288 | prev_pp = &pp->next; | |
289 | } | |
44856819 | 290 | *p = PTR_ALIGN((*p) + sz, 4); |
bbd33931 GL |
291 | } |
292 | /* with version 0x10 we may not have the name property, recreate | |
293 | * it here from the unit name if absent | |
294 | */ | |
295 | if (!has_name) { | |
296 | char *p1 = pathp, *ps = pathp, *pa = NULL; | |
297 | int sz; | |
298 | ||
299 | while (*p1) { | |
300 | if ((*p1) == '@') | |
301 | pa = p1; | |
302 | if ((*p1) == '/') | |
303 | ps = p1 + 1; | |
304 | p1++; | |
305 | } | |
306 | if (pa < ps) | |
307 | pa = p1; | |
308 | sz = (pa - ps) + 1; | |
309 | pp = unflatten_dt_alloc(&mem, sizeof(struct property) + sz, | |
310 | __alignof__(struct property)); | |
311 | if (allnextpp) { | |
312 | pp->name = "name"; | |
313 | pp->length = sz; | |
314 | pp->value = pp + 1; | |
315 | *prev_pp = pp; | |
316 | prev_pp = &pp->next; | |
317 | memcpy(pp->value, ps, sz - 1); | |
318 | ((char *)pp->value)[sz - 1] = 0; | |
319 | pr_debug("fixed up name for %s -> %s\n", pathp, | |
320 | (char *)pp->value); | |
321 | } | |
322 | } | |
323 | if (allnextpp) { | |
324 | *prev_pp = NULL; | |
325 | np->name = of_get_property(np, "name", NULL); | |
326 | np->type = of_get_property(np, "device_type", NULL); | |
327 | ||
328 | if (!np->name) | |
329 | np->name = "<NULL>"; | |
330 | if (!np->type) | |
331 | np->type = "<NULL>"; | |
332 | } | |
7f809e1f JG |
333 | while (tag == OF_DT_BEGIN_NODE || tag == OF_DT_NOP) { |
334 | if (tag == OF_DT_NOP) | |
335 | *p += 4; | |
336 | else | |
a40d6c4c SN |
337 | mem = unflatten_dt_node(blob, mem, p, np, allnextpp, |
338 | fpsize); | |
44856819 | 339 | tag = be32_to_cpup(*p); |
bbd33931 GL |
340 | } |
341 | if (tag != OF_DT_END_NODE) { | |
342 | pr_err("Weird tag at end of node: %x\n", tag); | |
343 | return mem; | |
344 | } | |
345 | *p += 4; | |
346 | return mem; | |
347 | } | |
41f88009 | 348 | |
fe140423 SN |
349 | /** |
350 | * __unflatten_device_tree - create tree of device_nodes from flat blob | |
351 | * | |
352 | * unflattens a device-tree, creating the | |
353 | * tree of struct device_node. It also fills the "name" and "type" | |
354 | * pointers of the nodes so the normal device-tree walking functions | |
355 | * can be used. | |
356 | * @blob: The blob to expand | |
357 | * @mynodes: The device_node tree created by the call | |
358 | * @dt_alloc: An allocator that provides a virtual address to memory | |
359 | * for the resulting tree | |
360 | */ | |
a7006c97 | 361 | static void __unflatten_device_tree(struct boot_param_header *blob, |
fe140423 SN |
362 | struct device_node **mynodes, |
363 | void * (*dt_alloc)(u64 size, u64 align)) | |
364 | { | |
44856819 GL |
365 | unsigned long size; |
366 | void *start, *mem; | |
fe140423 SN |
367 | struct device_node **allnextp = mynodes; |
368 | ||
369 | pr_debug(" -> unflatten_device_tree()\n"); | |
370 | ||
371 | if (!blob) { | |
372 | pr_debug("No device tree pointer\n"); | |
373 | return; | |
374 | } | |
375 | ||
376 | pr_debug("Unflattening device tree:\n"); | |
377 | pr_debug("magic: %08x\n", be32_to_cpu(blob->magic)); | |
378 | pr_debug("size: %08x\n", be32_to_cpu(blob->totalsize)); | |
379 | pr_debug("version: %08x\n", be32_to_cpu(blob->version)); | |
380 | ||
381 | if (be32_to_cpu(blob->magic) != OF_DT_HEADER) { | |
382 | pr_err("Invalid device tree blob header\n"); | |
383 | return; | |
384 | } | |
385 | ||
386 | /* First pass, scan for size */ | |
44856819 GL |
387 | start = ((void *)blob) + be32_to_cpu(blob->off_dt_struct); |
388 | size = (unsigned long)unflatten_dt_node(blob, 0, &start, NULL, NULL, 0); | |
389 | size = ALIGN(size, 4); | |
fe140423 SN |
390 | |
391 | pr_debug(" size is %lx, allocating...\n", size); | |
392 | ||
393 | /* Allocate memory for the expanded device tree */ | |
44856819 GL |
394 | mem = dt_alloc(size + 4, __alignof__(struct device_node)); |
395 | memset(mem, 0, size); | |
fe140423 | 396 | |
44856819 | 397 | *(__be32 *)(mem + size) = cpu_to_be32(0xdeadbeef); |
9e401275 | 398 | |
44856819 | 399 | pr_debug(" unflattening %p...\n", mem); |
fe140423 SN |
400 | |
401 | /* Second pass, do actual unflattening */ | |
44856819 | 402 | start = ((void *)blob) + be32_to_cpu(blob->off_dt_struct); |
fe140423 | 403 | unflatten_dt_node(blob, mem, &start, NULL, &allnextp, 0); |
44856819 GL |
404 | if (be32_to_cpup(start) != OF_DT_END) |
405 | pr_warning("Weird tag at end of tree: %08x\n", be32_to_cpup(start)); | |
406 | if (be32_to_cpup(mem + size) != 0xdeadbeef) | |
fe140423 | 407 | pr_warning("End of tree marker overwritten: %08x\n", |
44856819 | 408 | be32_to_cpup(mem + size)); |
fe140423 SN |
409 | *allnextp = NULL; |
410 | ||
411 | pr_debug(" <- unflatten_device_tree()\n"); | |
412 | } | |
413 | ||
414 | static void *kernel_tree_alloc(u64 size, u64 align) | |
415 | { | |
416 | return kzalloc(size, GFP_KERNEL); | |
417 | } | |
418 | ||
419 | /** | |
420 | * of_fdt_unflatten_tree - create tree of device_nodes from flat blob | |
421 | * | |
422 | * unflattens the device-tree passed by the firmware, creating the | |
423 | * tree of struct device_node. It also fills the "name" and "type" | |
424 | * pointers of the nodes so the normal device-tree walking functions | |
425 | * can be used. | |
426 | */ | |
427 | void of_fdt_unflatten_tree(unsigned long *blob, | |
428 | struct device_node **mynodes) | |
429 | { | |
430 | struct boot_param_header *device_tree = | |
431 | (struct boot_param_header *)blob; | |
432 | __unflatten_device_tree(device_tree, mynodes, &kernel_tree_alloc); | |
433 | } | |
434 | EXPORT_SYMBOL_GPL(of_fdt_unflatten_tree); | |
435 | ||
57d00ecf SN |
436 | /* Everything below here references initial_boot_params directly. */ |
437 | int __initdata dt_root_addr_cells; | |
438 | int __initdata dt_root_size_cells; | |
439 | ||
440 | struct boot_param_header *initial_boot_params; | |
441 | ||
442 | #ifdef CONFIG_OF_EARLY_FLATTREE | |
443 | ||
e8d9d1f5 MS |
444 | /** |
445 | * res_mem_reserve_reg() - reserve all memory described in 'reg' property | |
446 | */ | |
447 | static int __init __reserved_mem_reserve_reg(unsigned long node, | |
448 | const char *uname) | |
449 | { | |
450 | int t_len = (dt_root_addr_cells + dt_root_size_cells) * sizeof(__be32); | |
451 | phys_addr_t base, size; | |
452 | unsigned long len; | |
453 | __be32 *prop; | |
3f0c8206 | 454 | int nomap, first = 1; |
e8d9d1f5 MS |
455 | |
456 | prop = of_get_flat_dt_prop(node, "reg", &len); | |
457 | if (!prop) | |
458 | return -ENOENT; | |
459 | ||
460 | if (len && len % t_len != 0) { | |
461 | pr_err("Reserved memory: invalid reg property in '%s', skipping node.\n", | |
462 | uname); | |
463 | return -EINVAL; | |
464 | } | |
465 | ||
466 | nomap = of_get_flat_dt_prop(node, "no-map", NULL) != NULL; | |
467 | ||
468 | while (len >= t_len) { | |
469 | base = dt_mem_next_cell(dt_root_addr_cells, &prop); | |
470 | size = dt_mem_next_cell(dt_root_size_cells, &prop); | |
471 | ||
472 | if (base && size && | |
473 | early_init_dt_reserve_memory_arch(base, size, nomap) == 0) | |
474 | pr_debug("Reserved memory: reserved region for node '%s': base %pa, size %ld MiB\n", | |
475 | uname, &base, (unsigned long)size / SZ_1M); | |
476 | else | |
477 | pr_info("Reserved memory: failed to reserve memory for node '%s': base %pa, size %ld MiB\n", | |
478 | uname, &base, (unsigned long)size / SZ_1M); | |
479 | ||
480 | len -= t_len; | |
3f0c8206 MS |
481 | if (first) { |
482 | fdt_reserved_mem_save_node(node, uname, base, size); | |
483 | first = 0; | |
484 | } | |
e8d9d1f5 MS |
485 | } |
486 | return 0; | |
487 | } | |
488 | ||
489 | /** | |
490 | * __reserved_mem_check_root() - check if #size-cells, #address-cells provided | |
491 | * in /reserved-memory matches the values supported by the current implementation, | |
492 | * also check if ranges property has been provided | |
493 | */ | |
5b624118 | 494 | static int __init __reserved_mem_check_root(unsigned long node) |
e8d9d1f5 MS |
495 | { |
496 | __be32 *prop; | |
497 | ||
498 | prop = of_get_flat_dt_prop(node, "#size-cells", NULL); | |
499 | if (!prop || be32_to_cpup(prop) != dt_root_size_cells) | |
500 | return -EINVAL; | |
501 | ||
502 | prop = of_get_flat_dt_prop(node, "#address-cells", NULL); | |
503 | if (!prop || be32_to_cpup(prop) != dt_root_addr_cells) | |
504 | return -EINVAL; | |
505 | ||
506 | prop = of_get_flat_dt_prop(node, "ranges", NULL); | |
507 | if (!prop) | |
508 | return -EINVAL; | |
509 | return 0; | |
510 | } | |
511 | ||
512 | /** | |
513 | * fdt_scan_reserved_mem() - scan a single FDT node for reserved memory | |
514 | */ | |
515 | static int __init __fdt_scan_reserved_mem(unsigned long node, const char *uname, | |
516 | int depth, void *data) | |
517 | { | |
518 | static int found; | |
519 | const char *status; | |
3f0c8206 | 520 | int err; |
e8d9d1f5 MS |
521 | |
522 | if (!found && depth == 1 && strcmp(uname, "reserved-memory") == 0) { | |
523 | if (__reserved_mem_check_root(node) != 0) { | |
524 | pr_err("Reserved memory: unsupported node format, ignoring\n"); | |
525 | /* break scan */ | |
526 | return 1; | |
527 | } | |
528 | found = 1; | |
529 | /* scan next node */ | |
530 | return 0; | |
531 | } else if (!found) { | |
532 | /* scan next node */ | |
533 | return 0; | |
534 | } else if (found && depth < 2) { | |
535 | /* scanning of /reserved-memory has been finished */ | |
536 | return 1; | |
537 | } | |
538 | ||
539 | status = of_get_flat_dt_prop(node, "status", NULL); | |
540 | if (status && strcmp(status, "okay") != 0 && strcmp(status, "ok") != 0) | |
541 | return 0; | |
542 | ||
3f0c8206 MS |
543 | err = __reserved_mem_reserve_reg(node, uname); |
544 | if (err == -ENOENT && of_get_flat_dt_prop(node, "size", NULL)) | |
545 | fdt_reserved_mem_save_node(node, uname, 0, 0); | |
e8d9d1f5 MS |
546 | |
547 | /* scan next node */ | |
548 | return 0; | |
549 | } | |
550 | ||
551 | /** | |
552 | * early_init_fdt_scan_reserved_mem() - create reserved memory regions | |
553 | * | |
554 | * This function grabs memory from early allocator for device exclusive use | |
555 | * defined in device tree structures. It should be called by arch specific code | |
556 | * once the early allocator (i.e. memblock) has been fully activated. | |
557 | */ | |
558 | void __init early_init_fdt_scan_reserved_mem(void) | |
559 | { | |
2040b527 JC |
560 | if (!initial_boot_params) |
561 | return; | |
562 | ||
e8d9d1f5 | 563 | of_scan_flat_dt(__fdt_scan_reserved_mem, NULL); |
3f0c8206 | 564 | fdt_init_reserved_mem(); |
e8d9d1f5 MS |
565 | } |
566 | ||
57d00ecf SN |
567 | /** |
568 | * of_scan_flat_dt - scan flattened tree blob and call callback on each. | |
569 | * @it: callback function | |
570 | * @data: context data pointer | |
571 | * | |
572 | * This function is used to scan the flattened device-tree, it is | |
573 | * used to extract the memory information at boot before we can | |
574 | * unflatten the tree | |
575 | */ | |
576 | int __init of_scan_flat_dt(int (*it)(unsigned long node, | |
577 | const char *uname, int depth, | |
578 | void *data), | |
579 | void *data) | |
580 | { | |
581 | unsigned long p = ((unsigned long)initial_boot_params) + | |
582 | be32_to_cpu(initial_boot_params->off_dt_struct); | |
583 | int rc = 0; | |
584 | int depth = -1; | |
585 | ||
586 | do { | |
587 | u32 tag = be32_to_cpup((__be32 *)p); | |
e55b0829 | 588 | const char *pathp; |
57d00ecf SN |
589 | |
590 | p += 4; | |
591 | if (tag == OF_DT_END_NODE) { | |
592 | depth--; | |
593 | continue; | |
594 | } | |
595 | if (tag == OF_DT_NOP) | |
596 | continue; | |
597 | if (tag == OF_DT_END) | |
598 | break; | |
599 | if (tag == OF_DT_PROP) { | |
600 | u32 sz = be32_to_cpup((__be32 *)p); | |
601 | p += 8; | |
602 | if (be32_to_cpu(initial_boot_params->version) < 0x10) | |
603 | p = ALIGN(p, sz >= 8 ? 8 : 4); | |
604 | p += sz; | |
605 | p = ALIGN(p, 4); | |
606 | continue; | |
607 | } | |
608 | if (tag != OF_DT_BEGIN_NODE) { | |
609 | pr_err("Invalid tag %x in flat device tree!\n", tag); | |
610 | return -EINVAL; | |
611 | } | |
612 | depth++; | |
613 | pathp = (char *)p; | |
614 | p = ALIGN(p + strlen(pathp) + 1, 4); | |
375da3a7 AS |
615 | if (*pathp == '/') |
616 | pathp = kbasename(pathp); | |
57d00ecf SN |
617 | rc = it(p, pathp, depth, data); |
618 | if (rc != 0) | |
619 | break; | |
620 | } while (1); | |
621 | ||
622 | return rc; | |
623 | } | |
624 | ||
625 | /** | |
626 | * of_get_flat_dt_root - find the root node in the flat blob | |
627 | */ | |
628 | unsigned long __init of_get_flat_dt_root(void) | |
629 | { | |
630 | unsigned long p = ((unsigned long)initial_boot_params) + | |
631 | be32_to_cpu(initial_boot_params->off_dt_struct); | |
632 | ||
633 | while (be32_to_cpup((__be32 *)p) == OF_DT_NOP) | |
634 | p += 4; | |
635 | BUG_ON(be32_to_cpup((__be32 *)p) != OF_DT_BEGIN_NODE); | |
636 | p += 4; | |
637 | return ALIGN(p + strlen((char *)p) + 1, 4); | |
638 | } | |
639 | ||
640 | /** | |
641 | * of_get_flat_dt_prop - Given a node in the flat blob, return the property ptr | |
642 | * | |
643 | * This function can be used within scan_flattened_dt callback to get | |
644 | * access to properties | |
645 | */ | |
646 | void *__init of_get_flat_dt_prop(unsigned long node, const char *name, | |
647 | unsigned long *size) | |
648 | { | |
649 | return of_fdt_get_property(initial_boot_params, node, name, size); | |
650 | } | |
651 | ||
652 | /** | |
653 | * of_flat_dt_is_compatible - Return true if given node has compat in compatible list | |
654 | * @node: node to test | |
655 | * @compat: compatible string to compare with compatible list. | |
656 | */ | |
657 | int __init of_flat_dt_is_compatible(unsigned long node, const char *compat) | |
658 | { | |
659 | return of_fdt_is_compatible(initial_boot_params, node, compat); | |
660 | } | |
661 | ||
a4f740cf GL |
662 | /** |
663 | * of_flat_dt_match - Return true if node matches a list of compatible values | |
664 | */ | |
7b482c83 | 665 | int __init of_flat_dt_match(unsigned long node, const char *const *compat) |
a4f740cf GL |
666 | { |
667 | return of_fdt_match(initial_boot_params, node, compat); | |
668 | } | |
669 | ||
57d74bcf MS |
670 | struct fdt_scan_status { |
671 | const char *name; | |
672 | int namelen; | |
673 | int depth; | |
674 | int found; | |
675 | int (*iterator)(unsigned long node, const char *uname, int depth, void *data); | |
676 | void *data; | |
677 | }; | |
678 | ||
679 | /** | |
680 | * fdt_scan_node_by_path - iterator for of_scan_flat_dt_by_path function | |
681 | */ | |
682 | static int __init fdt_scan_node_by_path(unsigned long node, const char *uname, | |
683 | int depth, void *data) | |
684 | { | |
685 | struct fdt_scan_status *st = data; | |
686 | ||
687 | /* | |
688 | * if scan at the requested fdt node has been completed, | |
689 | * return -ENXIO to abort further scanning | |
690 | */ | |
691 | if (depth <= st->depth) | |
692 | return -ENXIO; | |
693 | ||
694 | /* requested fdt node has been found, so call iterator function */ | |
695 | if (st->found) | |
696 | return st->iterator(node, uname, depth, st->data); | |
697 | ||
698 | /* check if scanning automata is entering next level of fdt nodes */ | |
699 | if (depth == st->depth + 1 && | |
700 | strncmp(st->name, uname, st->namelen) == 0 && | |
701 | uname[st->namelen] == 0) { | |
702 | st->depth += 1; | |
703 | if (st->name[st->namelen] == 0) { | |
704 | st->found = 1; | |
705 | } else { | |
706 | const char *next = st->name + st->namelen + 1; | |
707 | st->name = next; | |
708 | st->namelen = strcspn(next, "/"); | |
709 | } | |
710 | return 0; | |
711 | } | |
712 | ||
713 | /* scan next fdt node */ | |
714 | return 0; | |
715 | } | |
716 | ||
717 | /** | |
718 | * of_scan_flat_dt_by_path - scan flattened tree blob and call callback on each | |
719 | * child of the given path. | |
720 | * @path: path to start searching for children | |
721 | * @it: callback function | |
722 | * @data: context data pointer | |
723 | * | |
724 | * This function is used to scan the flattened device-tree starting from the | |
725 | * node given by path. It is used to extract information (like reserved | |
726 | * memory), which is required on ealy boot before we can unflatten the tree. | |
727 | */ | |
728 | int __init of_scan_flat_dt_by_path(const char *path, | |
729 | int (*it)(unsigned long node, const char *name, int depth, void *data), | |
730 | void *data) | |
731 | { | |
732 | struct fdt_scan_status st = {path, 0, -1, 0, it, data}; | |
733 | int ret = 0; | |
734 | ||
735 | if (initial_boot_params) | |
736 | ret = of_scan_flat_dt(fdt_scan_node_by_path, &st); | |
737 | ||
738 | if (!st.found) | |
739 | return -ENOENT; | |
740 | else if (ret == -ENXIO) /* scan has been completed */ | |
741 | return 0; | |
742 | else | |
743 | return ret; | |
744 | } | |
745 | ||
6a903a25 RH |
746 | const char * __init of_flat_dt_get_machine_name(void) |
747 | { | |
748 | const char *name; | |
749 | unsigned long dt_root = of_get_flat_dt_root(); | |
750 | ||
751 | name = of_get_flat_dt_prop(dt_root, "model", NULL); | |
752 | if (!name) | |
753 | name = of_get_flat_dt_prop(dt_root, "compatible", NULL); | |
754 | return name; | |
755 | } | |
756 | ||
757 | /** | |
758 | * of_flat_dt_match_machine - Iterate match tables to find matching machine. | |
759 | * | |
760 | * @default_match: A machine specific ptr to return in case of no match. | |
761 | * @get_next_compat: callback function to return next compatible match table. | |
762 | * | |
763 | * Iterate through machine match tables to find the best match for the machine | |
764 | * compatible string in the FDT. | |
765 | */ | |
766 | const void * __init of_flat_dt_match_machine(const void *default_match, | |
767 | const void * (*get_next_compat)(const char * const**)) | |
768 | { | |
769 | const void *data = NULL; | |
770 | const void *best_data = default_match; | |
771 | const char *const *compat; | |
772 | unsigned long dt_root; | |
773 | unsigned int best_score = ~1, score = 0; | |
774 | ||
775 | dt_root = of_get_flat_dt_root(); | |
776 | while ((data = get_next_compat(&compat))) { | |
777 | score = of_flat_dt_match(dt_root, compat); | |
778 | if (score > 0 && score < best_score) { | |
779 | best_data = data; | |
780 | best_score = score; | |
781 | } | |
782 | } | |
783 | if (!best_data) { | |
784 | const char *prop; | |
785 | long size; | |
786 | ||
787 | pr_err("\n unrecognized device tree list:\n[ "); | |
788 | ||
789 | prop = of_get_flat_dt_prop(dt_root, "compatible", &size); | |
790 | if (prop) { | |
791 | while (size > 0) { | |
792 | printk("'%s' ", prop); | |
793 | size -= strlen(prop) + 1; | |
794 | prop += strlen(prop) + 1; | |
795 | } | |
796 | } | |
797 | printk("]\n\n"); | |
798 | return NULL; | |
799 | } | |
800 | ||
801 | pr_info("Machine model: %s\n", of_flat_dt_get_machine_name()); | |
802 | ||
803 | return best_data; | |
804 | } | |
805 | ||
f7b3a835 GL |
806 | #ifdef CONFIG_BLK_DEV_INITRD |
807 | /** | |
808 | * early_init_dt_check_for_initrd - Decode initrd location from flat tree | |
809 | * @node: reference to node containing initrd location ('chosen') | |
810 | */ | |
29eb45a9 | 811 | static void __init early_init_dt_check_for_initrd(unsigned long node) |
f7b3a835 | 812 | { |
374d5c99 SS |
813 | u64 start, end; |
814 | unsigned long len; | |
33714881 | 815 | __be32 *prop; |
f7b3a835 GL |
816 | |
817 | pr_debug("Looking for initrd properties... "); | |
818 | ||
819 | prop = of_get_flat_dt_prop(node, "linux,initrd-start", &len); | |
1406bc2f JK |
820 | if (!prop) |
821 | return; | |
374d5c99 | 822 | start = of_read_number(prop, len/4); |
1406bc2f JK |
823 | |
824 | prop = of_get_flat_dt_prop(node, "linux,initrd-end", &len); | |
825 | if (!prop) | |
826 | return; | |
374d5c99 | 827 | end = of_read_number(prop, len/4); |
f7b3a835 | 828 | |
29eb45a9 RH |
829 | initrd_start = (unsigned long)__va(start); |
830 | initrd_end = (unsigned long)__va(end); | |
831 | initrd_below_start_ok = 1; | |
832 | ||
374d5c99 SS |
833 | pr_debug("initrd_start=0x%llx initrd_end=0x%llx\n", |
834 | (unsigned long long)start, (unsigned long long)end); | |
f7b3a835 GL |
835 | } |
836 | #else | |
29eb45a9 | 837 | static inline void early_init_dt_check_for_initrd(unsigned long node) |
f7b3a835 GL |
838 | { |
839 | } | |
840 | #endif /* CONFIG_BLK_DEV_INITRD */ | |
841 | ||
f00abd94 GL |
842 | /** |
843 | * early_init_dt_scan_root - fetch the top level address and size cells | |
844 | */ | |
845 | int __init early_init_dt_scan_root(unsigned long node, const char *uname, | |
846 | int depth, void *data) | |
847 | { | |
33714881 | 848 | __be32 *prop; |
f00abd94 GL |
849 | |
850 | if (depth != 0) | |
851 | return 0; | |
852 | ||
33714881 JK |
853 | dt_root_size_cells = OF_ROOT_NODE_SIZE_CELLS_DEFAULT; |
854 | dt_root_addr_cells = OF_ROOT_NODE_ADDR_CELLS_DEFAULT; | |
855 | ||
f00abd94 | 856 | prop = of_get_flat_dt_prop(node, "#size-cells", NULL); |
33714881 JK |
857 | if (prop) |
858 | dt_root_size_cells = be32_to_cpup(prop); | |
f00abd94 GL |
859 | pr_debug("dt_root_size_cells = %x\n", dt_root_size_cells); |
860 | ||
861 | prop = of_get_flat_dt_prop(node, "#address-cells", NULL); | |
33714881 JK |
862 | if (prop) |
863 | dt_root_addr_cells = be32_to_cpup(prop); | |
f00abd94 GL |
864 | pr_debug("dt_root_addr_cells = %x\n", dt_root_addr_cells); |
865 | ||
866 | /* break now */ | |
867 | return 1; | |
868 | } | |
869 | ||
2e89e685 | 870 | u64 __init dt_mem_next_cell(int s, __be32 **cellp) |
83f7a06e | 871 | { |
2e89e685 | 872 | __be32 *p = *cellp; |
83f7a06e GL |
873 | |
874 | *cellp = p + s; | |
875 | return of_read_number(p, s); | |
876 | } | |
877 | ||
51975db0 GL |
878 | /** |
879 | * early_init_dt_scan_memory - Look for an parse memory nodes | |
880 | */ | |
881 | int __init early_init_dt_scan_memory(unsigned long node, const char *uname, | |
882 | int depth, void *data) | |
883 | { | |
884 | char *type = of_get_flat_dt_prop(node, "device_type", NULL); | |
885 | __be32 *reg, *endp; | |
886 | unsigned long l; | |
887 | ||
888 | /* We are scanning "memory" nodes only */ | |
889 | if (type == NULL) { | |
890 | /* | |
891 | * The longtrail doesn't have a device_type on the | |
892 | * /memory node, so look for the node called /memory@0. | |
893 | */ | |
894 | if (depth != 1 || strcmp(uname, "memory@0") != 0) | |
895 | return 0; | |
896 | } else if (strcmp(type, "memory") != 0) | |
897 | return 0; | |
898 | ||
899 | reg = of_get_flat_dt_prop(node, "linux,usable-memory", &l); | |
900 | if (reg == NULL) | |
901 | reg = of_get_flat_dt_prop(node, "reg", &l); | |
902 | if (reg == NULL) | |
903 | return 0; | |
904 | ||
905 | endp = reg + (l / sizeof(__be32)); | |
906 | ||
907 | pr_debug("memory scan node %s, reg size %ld, data: %x %x %x %x,\n", | |
908 | uname, l, reg[0], reg[1], reg[2], reg[3]); | |
909 | ||
910 | while ((endp - reg) >= (dt_root_addr_cells + dt_root_size_cells)) { | |
911 | u64 base, size; | |
912 | ||
913 | base = dt_mem_next_cell(dt_root_addr_cells, ®); | |
914 | size = dt_mem_next_cell(dt_root_size_cells, ®); | |
915 | ||
916 | if (size == 0) | |
917 | continue; | |
918 | pr_debug(" - %llx , %llx\n", (unsigned long long)base, | |
919 | (unsigned long long)size); | |
920 | ||
921 | early_init_dt_add_memory_arch(base, size); | |
922 | } | |
923 | ||
924 | return 0; | |
925 | } | |
926 | ||
86e03221 GL |
927 | int __init early_init_dt_scan_chosen(unsigned long node, const char *uname, |
928 | int depth, void *data) | |
929 | { | |
930 | unsigned long l; | |
931 | char *p; | |
932 | ||
933 | pr_debug("search \"chosen\", depth: %d, uname: %s\n", depth, uname); | |
934 | ||
85f60ae4 | 935 | if (depth != 1 || !data || |
86e03221 GL |
936 | (strcmp(uname, "chosen") != 0 && strcmp(uname, "chosen@0") != 0)) |
937 | return 0; | |
938 | ||
939 | early_init_dt_check_for_initrd(node); | |
940 | ||
25985edc | 941 | /* Retrieve command line */ |
86e03221 GL |
942 | p = of_get_flat_dt_prop(node, "bootargs", &l); |
943 | if (p != NULL && l > 0) | |
85f60ae4 | 944 | strlcpy(data, p, min((int)l, COMMAND_LINE_SIZE)); |
86e03221 | 945 | |
78b782cb BH |
946 | /* |
947 | * CONFIG_CMDLINE is meant to be a default in case nothing else | |
948 | * managed to set the command line, unless CONFIG_CMDLINE_FORCE | |
949 | * is set in which case we override whatever was found earlier. | |
950 | */ | |
86e03221 GL |
951 | #ifdef CONFIG_CMDLINE |
952 | #ifndef CONFIG_CMDLINE_FORCE | |
78b782cb | 953 | if (!((char *)data)[0]) |
86e03221 | 954 | #endif |
85f60ae4 | 955 | strlcpy(data, CONFIG_CMDLINE, COMMAND_LINE_SIZE); |
86e03221 GL |
956 | #endif /* CONFIG_CMDLINE */ |
957 | ||
85f60ae4 | 958 | pr_debug("Command line is: %s\n", (char*)data); |
86e03221 GL |
959 | |
960 | /* break now */ | |
961 | return 1; | |
962 | } | |
963 | ||
a1727da5 | 964 | #ifdef CONFIG_HAVE_MEMBLOCK |
068f6310 RH |
965 | void __init __weak early_init_dt_add_memory_arch(u64 base, u64 size) |
966 | { | |
967 | const u64 phys_offset = __pa(PAGE_OFFSET); | |
968 | base &= PAGE_MASK; | |
969 | size &= PAGE_MASK; | |
970 | if (base + size < phys_offset) { | |
971 | pr_warning("Ignoring memory block 0x%llx - 0x%llx\n", | |
972 | base, base + size); | |
973 | return; | |
974 | } | |
975 | if (base < phys_offset) { | |
976 | pr_warning("Ignoring memory range 0x%llx - 0x%llx\n", | |
977 | base, phys_offset); | |
978 | size -= phys_offset - base; | |
979 | base = phys_offset; | |
980 | } | |
981 | memblock_add(base, size); | |
982 | } | |
983 | ||
e8d9d1f5 MS |
984 | int __init __weak early_init_dt_reserve_memory_arch(phys_addr_t base, |
985 | phys_addr_t size, bool nomap) | |
986 | { | |
987 | if (memblock_is_region_reserved(base, size)) | |
988 | return -EBUSY; | |
989 | if (nomap) | |
990 | return memblock_remove(base, size); | |
991 | return memblock_reserve(base, size); | |
992 | } | |
993 | ||
a1727da5 GL |
994 | /* |
995 | * called from unflatten_device_tree() to bootstrap devicetree itself | |
996 | * Architectures can override this definition if memblock isn't used | |
997 | */ | |
998 | void * __init __weak early_init_dt_alloc_memory_arch(u64 size, u64 align) | |
999 | { | |
1000 | return __va(memblock_alloc(size, align)); | |
1001 | } | |
e8d9d1f5 MS |
1002 | #else |
1003 | int __init __weak early_init_dt_reserve_memory_arch(phys_addr_t base, | |
1004 | phys_addr_t size, bool nomap) | |
1005 | { | |
1006 | pr_err("Reserved memory not supported, ignoring range 0x%llx - 0x%llx%s\n", | |
1007 | base, size, nomap ? " (nomap)" : ""); | |
1008 | return -ENOSYS; | |
1009 | } | |
a1727da5 GL |
1010 | #endif |
1011 | ||
0288ffcb RH |
1012 | bool __init early_init_dt_scan(void *params) |
1013 | { | |
1014 | if (!params) | |
1015 | return false; | |
1016 | ||
1017 | /* Setup flat device-tree pointer */ | |
1018 | initial_boot_params = params; | |
1019 | ||
1020 | /* check device tree validity */ | |
1021 | if (be32_to_cpu(initial_boot_params->magic) != OF_DT_HEADER) { | |
1022 | initial_boot_params = NULL; | |
1023 | return false; | |
1024 | } | |
1025 | ||
1026 | /* Retrieve various information from the /chosen node */ | |
1027 | of_scan_flat_dt(early_init_dt_scan_chosen, boot_command_line); | |
1028 | ||
1029 | /* Initialize {size,address}-cells info */ | |
1030 | of_scan_flat_dt(early_init_dt_scan_root, NULL); | |
1031 | ||
1032 | /* Setup memory, calling early_init_dt_add_memory_arch */ | |
1033 | of_scan_flat_dt(early_init_dt_scan_memory, NULL); | |
1034 | ||
1035 | return true; | |
1036 | } | |
1037 | ||
41f88009 GL |
1038 | /** |
1039 | * unflatten_device_tree - create tree of device_nodes from flat blob | |
1040 | * | |
1041 | * unflattens the device-tree passed by the firmware, creating the | |
1042 | * tree of struct device_node. It also fills the "name" and "type" | |
1043 | * pointers of the nodes so the normal device-tree walking functions | |
1044 | * can be used. | |
1045 | */ | |
1046 | void __init unflatten_device_tree(void) | |
1047 | { | |
465aac6d | 1048 | __unflatten_device_tree(initial_boot_params, &of_allnodes, |
672c5446 | 1049 | early_init_dt_alloc_memory_arch); |
41f88009 | 1050 | |
4c7d6361 | 1051 | /* Get pointer to "/chosen" and "/aliases" nodes for use everywhere */ |
611cad72 | 1052 | of_alias_scan(early_init_dt_alloc_memory_arch); |
41f88009 | 1053 | } |
e6ce1324 | 1054 | |
a8bf7527 RH |
1055 | /** |
1056 | * unflatten_and_copy_device_tree - copy and create tree of device_nodes from flat blob | |
1057 | * | |
1058 | * Copies and unflattens the device-tree passed by the firmware, creating the | |
1059 | * tree of struct device_node. It also fills the "name" and "type" | |
1060 | * pointers of the nodes so the normal device-tree walking functions | |
1061 | * can be used. This should only be used when the FDT memory has not been | |
1062 | * reserved such is the case when the FDT is built-in to the kernel init | |
1063 | * section. If the FDT memory is reserved already then unflatten_device_tree | |
1064 | * should be used instead. | |
1065 | */ | |
1066 | void __init unflatten_and_copy_device_tree(void) | |
1067 | { | |
6f041e99 JH |
1068 | int size; |
1069 | void *dt; | |
1070 | ||
1071 | if (!initial_boot_params) { | |
1072 | pr_warn("No valid device tree found, continuing without\n"); | |
1073 | return; | |
1074 | } | |
1075 | ||
1076 | size = __be32_to_cpu(initial_boot_params->totalsize); | |
1077 | dt = early_init_dt_alloc_memory_arch(size, | |
a8bf7527 RH |
1078 | __alignof__(struct boot_param_header)); |
1079 | ||
1080 | if (dt) { | |
1081 | memcpy(dt, initial_boot_params, size); | |
1082 | initial_boot_params = dt; | |
1083 | } | |
1084 | unflatten_device_tree(); | |
1085 | } | |
1086 | ||
e6ce1324 | 1087 | #endif /* CONFIG_OF_EARLY_FLATTREE */ |