blob: 808be06bb67e7d4eeaf4f7250fae2dace0cc0f8d [file] [log] [blame]
Grant Likelye169cfb2009-11-23 14:53:09 -07001/*
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
Grant Likely41f88002009-11-23 20:07:01 -070012#include <linux/kernel.h>
Grant Likelyf7b3a832009-11-24 03:26:58 -070013#include <linux/initrd.h>
Stephen Neuendorfferfe140422010-11-18 15:55:02 -080014#include <linux/module.h>
Grant Likelye169cfb2009-11-23 14:53:09 -070015#include <linux/of.h>
16#include <linux/of_fdt.h>
Jeremy Kerr4ef7b372010-02-14 07:13:47 -070017#include <linux/string.h>
18#include <linux/errno.h>
Stephen Neuendorfferfe140422010-11-18 15:55:02 -080019#include <linux/slab.h>
Grant Likely51975db2010-02-01 21:34:14 -070020
Fabio Estevamc89810a2012-01-02 14:19:03 -020021#include <asm/setup.h> /* for COMMAND_LINE_SIZE */
Grant Likely86e03222009-12-10 23:42:21 -070022#ifdef CONFIG_PPC
23#include <asm/machdep.h>
24#endif /* CONFIG_PPC */
25
Jeremy Kerr4ef7b372010-02-14 07:13:47 -070026#include <asm/page.h>
27
Stephen Neuendorffer9706a362010-11-18 15:54:59 -080028char *of_fdt_get_string(struct boot_param_header *blob, u32 offset)
29{
30 return ((char *)blob) +
31 be32_to_cpu(blob->off_dt_strings) + offset;
32}
33
34/**
35 * of_fdt_get_property - Given a node in the given flat blob, return
36 * the property ptr
37 */
38void *of_fdt_get_property(struct boot_param_header *blob,
39 unsigned long node, const char *name,
40 unsigned long *size)
41{
42 unsigned long p = node;
43
44 do {
45 u32 tag = be32_to_cpup((__be32 *)p);
46 u32 sz, noff;
47 const char *nstr;
48
49 p += 4;
50 if (tag == OF_DT_NOP)
51 continue;
52 if (tag != OF_DT_PROP)
53 return NULL;
54
55 sz = be32_to_cpup((__be32 *)p);
56 noff = be32_to_cpup((__be32 *)(p + 4));
57 p += 8;
58 if (be32_to_cpu(blob->version) < 0x10)
59 p = ALIGN(p, sz >= 8 ? 8 : 4);
60
61 nstr = of_fdt_get_string(blob, noff);
62 if (nstr == NULL) {
63 pr_warning("Can't find property index name !\n");
64 return NULL;
65 }
66 if (strcmp(name, nstr) == 0) {
67 if (size)
68 *size = sz;
69 return (void *)p;
70 }
71 p += sz;
72 p = ALIGN(p, 4);
73 } while (1);
74}
75
76/**
77 * of_fdt_is_compatible - Return true if given node from the given blob has
78 * compat in its compatible list
79 * @blob: A device tree blob
80 * @node: node to test
81 * @compat: compatible string to compare with compatible list.
Grant Likelya4f740c2010-10-30 11:49:09 -040082 *
83 * On match, returns a non-zero value with smaller values returned for more
84 * specific compatible values.
Stephen Neuendorffer9706a362010-11-18 15:54:59 -080085 */
86int of_fdt_is_compatible(struct boot_param_header *blob,
87 unsigned long node, const char *compat)
88{
89 const char *cp;
Grant Likelya4f740c2010-10-30 11:49:09 -040090 unsigned long cplen, l, score = 0;
Stephen Neuendorffer9706a362010-11-18 15:54:59 -080091
92 cp = of_fdt_get_property(blob, node, "compatible", &cplen);
93 if (cp == NULL)
94 return 0;
95 while (cplen > 0) {
Grant Likelya4f740c2010-10-30 11:49:09 -040096 score++;
Stephen Neuendorffer9706a362010-11-18 15:54:59 -080097 if (of_compat_cmp(cp, compat, strlen(compat)) == 0)
Grant Likelya4f740c2010-10-30 11:49:09 -040098 return score;
Stephen Neuendorffer9706a362010-11-18 15:54:59 -080099 l = strlen(cp) + 1;
100 cp += l;
101 cplen -= l;
102 }
103
104 return 0;
105}
106
Grant Likelya4f740c2010-10-30 11:49:09 -0400107/**
108 * of_fdt_match - Return true if node matches a list of compatible values
109 */
110int of_fdt_match(struct boot_param_header *blob, unsigned long node,
Uwe Kleine-König7b482c82011-12-20 22:56:45 +0100111 const char *const *compat)
Grant Likelya4f740c2010-10-30 11:49:09 -0400112{
113 unsigned int tmp, score = 0;
114
115 if (!compat)
116 return 0;
117
118 while (*compat) {
119 tmp = of_fdt_is_compatible(blob, node, *compat);
120 if (tmp && (score == 0 || (tmp < score)))
121 score = tmp;
122 compat++;
123 }
124
125 return score;
126}
127
Stephen Neuendorffera40d6c42010-11-18 15:55:00 -0800128static void *unflatten_dt_alloc(unsigned long *mem, unsigned long size,
Grant Likelybbd33932009-11-23 20:07:00 -0700129 unsigned long align)
130{
131 void *res;
132
Grant Likelyf1d4c3a2010-06-25 12:16:52 -0600133 *mem = ALIGN(*mem, align);
Grant Likelybbd33932009-11-23 20:07:00 -0700134 res = (void *)*mem;
135 *mem += size;
136
137 return res;
138}
139
140/**
141 * unflatten_dt_node - Alloc and populate a device_node from the flat tree
Stephen Neuendorffera40d6c42010-11-18 15:55:00 -0800142 * @blob: The parent device tree blob
Andres Salomona7006c92011-03-17 17:32:35 -0700143 * @mem: Memory chunk to use for allocating device nodes and properties
Grant Likelybbd33932009-11-23 20:07:00 -0700144 * @p: pointer to node in flat tree
145 * @dad: Parent struct device_node
146 * @allnextpp: pointer to ->allnext from last allocated device_node
147 * @fpsize: Size of the node path up at the current depth.
148 */
Andres Salomona7006c92011-03-17 17:32:35 -0700149static unsigned long unflatten_dt_node(struct boot_param_header *blob,
Stephen Neuendorffera40d6c42010-11-18 15:55:00 -0800150 unsigned long mem,
151 unsigned long *p,
152 struct device_node *dad,
153 struct device_node ***allnextpp,
154 unsigned long fpsize)
Grant Likelybbd33932009-11-23 20:07:00 -0700155{
156 struct device_node *np;
157 struct property *pp, **prev_pp = NULL;
158 char *pathp;
159 u32 tag;
160 unsigned int l, allocl;
161 int has_name = 0;
162 int new_format = 0;
163
Jeremy Kerr33714882010-01-30 01:45:26 -0700164 tag = be32_to_cpup((__be32 *)(*p));
Grant Likelybbd33932009-11-23 20:07:00 -0700165 if (tag != OF_DT_BEGIN_NODE) {
166 pr_err("Weird tag at start of node: %x\n", tag);
167 return mem;
168 }
169 *p += 4;
170 pathp = (char *)*p;
171 l = allocl = strlen(pathp) + 1;
Grant Likelyf1d4c3a2010-06-25 12:16:52 -0600172 *p = ALIGN(*p + l, 4);
Grant Likelybbd33932009-11-23 20:07:00 -0700173
174 /* version 0x10 has a more compact unit name here instead of the full
175 * path. we accumulate the full path size using "fpsize", we'll rebuild
176 * it later. We detect this because the first character of the name is
177 * not '/'.
178 */
179 if ((*pathp) != '/') {
180 new_format = 1;
181 if (fpsize == 0) {
182 /* root node: special case. fpsize accounts for path
183 * plus terminating zero. root node only has '/', so
184 * fpsize should be 2, but we want to avoid the first
185 * level nodes to have two '/' so we use fpsize 1 here
186 */
187 fpsize = 1;
188 allocl = 2;
Catalin Marinas0fca5de2012-11-16 15:14:38 +0000189 l = 1;
190 *pathp = '\0';
Grant Likelybbd33932009-11-23 20:07:00 -0700191 } else {
192 /* account for '/' and path size minus terminal 0
193 * already in 'l'
194 */
195 fpsize += l;
196 allocl = fpsize;
197 }
198 }
199
200 np = unflatten_dt_alloc(&mem, sizeof(struct device_node) + allocl,
201 __alignof__(struct device_node));
202 if (allnextpp) {
Grant Likelyc22618a2012-11-14 22:37:12 +0000203 char *fn;
Grant Likelybbd33932009-11-23 20:07:00 -0700204 memset(np, 0, sizeof(*np));
Grant Likelyc22618a2012-11-14 22:37:12 +0000205 np->full_name = fn = ((char *)np) + sizeof(*np);
Grant Likelybbd33932009-11-23 20:07:00 -0700206 if (new_format) {
Grant Likelybbd33932009-11-23 20:07:00 -0700207 /* rebuild full path for new format */
208 if (dad && dad->parent) {
209 strcpy(fn, dad->full_name);
210#ifdef DEBUG
211 if ((strlen(fn) + l + 1) != allocl) {
212 pr_debug("%s: p: %d, l: %d, a: %d\n",
213 pathp, (int)strlen(fn),
214 l, allocl);
215 }
216#endif
217 fn += strlen(fn);
218 }
219 *(fn++) = '/';
Grant Likelyc22618a2012-11-14 22:37:12 +0000220 }
221 memcpy(fn, pathp, l);
222
Grant Likelybbd33932009-11-23 20:07:00 -0700223 prev_pp = &np->properties;
224 **allnextpp = np;
225 *allnextpp = &np->allnext;
226 if (dad != NULL) {
227 np->parent = dad;
228 /* we temporarily use the next field as `last_child'*/
229 if (dad->next == NULL)
230 dad->child = np;
231 else
232 dad->next->sibling = np;
233 dad->next = np;
234 }
235 kref_init(&np->kref);
236 }
Andres Salomona7006c92011-03-17 17:32:35 -0700237 /* process properties */
Grant Likelybbd33932009-11-23 20:07:00 -0700238 while (1) {
239 u32 sz, noff;
240 char *pname;
241
Jeremy Kerr33714882010-01-30 01:45:26 -0700242 tag = be32_to_cpup((__be32 *)(*p));
Grant Likelybbd33932009-11-23 20:07:00 -0700243 if (tag == OF_DT_NOP) {
244 *p += 4;
245 continue;
246 }
247 if (tag != OF_DT_PROP)
248 break;
249 *p += 4;
Jeremy Kerr33714882010-01-30 01:45:26 -0700250 sz = be32_to_cpup((__be32 *)(*p));
251 noff = be32_to_cpup((__be32 *)((*p) + 4));
Grant Likelybbd33932009-11-23 20:07:00 -0700252 *p += 8;
Stephen Neuendorffera40d6c42010-11-18 15:55:00 -0800253 if (be32_to_cpu(blob->version) < 0x10)
Grant Likelyf1d4c3a2010-06-25 12:16:52 -0600254 *p = ALIGN(*p, sz >= 8 ? 8 : 4);
Grant Likelybbd33932009-11-23 20:07:00 -0700255
Stephen Neuendorffera40d6c42010-11-18 15:55:00 -0800256 pname = of_fdt_get_string(blob, noff);
Grant Likelybbd33932009-11-23 20:07:00 -0700257 if (pname == NULL) {
258 pr_info("Can't find property name in list !\n");
259 break;
260 }
261 if (strcmp(pname, "name") == 0)
262 has_name = 1;
263 l = strlen(pname) + 1;
264 pp = unflatten_dt_alloc(&mem, sizeof(struct property),
265 __alignof__(struct property));
266 if (allnextpp) {
David Gibson04b954a2010-02-01 21:34:15 -0700267 /* We accept flattened tree phandles either in
268 * ePAPR-style "phandle" properties, or the
269 * legacy "linux,phandle" properties. If both
270 * appear and have different values, things
271 * will get weird. Don't do that. */
272 if ((strcmp(pname, "phandle") == 0) ||
273 (strcmp(pname, "linux,phandle") == 0)) {
Grant Likely6016a362010-01-28 14:06:53 -0700274 if (np->phandle == 0)
Grant Likely9a6b2e52010-07-23 01:48:25 -0600275 np->phandle = be32_to_cpup((__be32*)*p);
Grant Likelybbd33932009-11-23 20:07:00 -0700276 }
David Gibson04b954a2010-02-01 21:34:15 -0700277 /* And we process the "ibm,phandle" property
278 * used in pSeries dynamic device tree
279 * stuff */
Grant Likelybbd33932009-11-23 20:07:00 -0700280 if (strcmp(pname, "ibm,phandle") == 0)
Grant Likely9a6b2e52010-07-23 01:48:25 -0600281 np->phandle = be32_to_cpup((__be32 *)*p);
Grant Likelybbd33932009-11-23 20:07:00 -0700282 pp->name = pname;
283 pp->length = sz;
284 pp->value = (void *)*p;
285 *prev_pp = pp;
286 prev_pp = &pp->next;
287 }
Grant Likelyf1d4c3a2010-06-25 12:16:52 -0600288 *p = ALIGN((*p) + sz, 4);
Grant Likelybbd33932009-11-23 20:07:00 -0700289 }
290 /* with version 0x10 we may not have the name property, recreate
291 * it here from the unit name if absent
292 */
293 if (!has_name) {
294 char *p1 = pathp, *ps = pathp, *pa = NULL;
295 int sz;
296
297 while (*p1) {
298 if ((*p1) == '@')
299 pa = p1;
300 if ((*p1) == '/')
301 ps = p1 + 1;
302 p1++;
303 }
304 if (pa < ps)
305 pa = p1;
306 sz = (pa - ps) + 1;
307 pp = unflatten_dt_alloc(&mem, sizeof(struct property) + sz,
308 __alignof__(struct property));
309 if (allnextpp) {
310 pp->name = "name";
311 pp->length = sz;
312 pp->value = pp + 1;
313 *prev_pp = pp;
314 prev_pp = &pp->next;
315 memcpy(pp->value, ps, sz - 1);
316 ((char *)pp->value)[sz - 1] = 0;
317 pr_debug("fixed up name for %s -> %s\n", pathp,
318 (char *)pp->value);
319 }
320 }
321 if (allnextpp) {
322 *prev_pp = NULL;
323 np->name = of_get_property(np, "name", NULL);
324 np->type = of_get_property(np, "device_type", NULL);
325
326 if (!np->name)
327 np->name = "<NULL>";
328 if (!np->type)
329 np->type = "<NULL>";
330 }
Jason Gunthorpe7f809e12010-03-26 22:09:56 -0600331 while (tag == OF_DT_BEGIN_NODE || tag == OF_DT_NOP) {
332 if (tag == OF_DT_NOP)
333 *p += 4;
334 else
Stephen Neuendorffera40d6c42010-11-18 15:55:00 -0800335 mem = unflatten_dt_node(blob, mem, p, np, allnextpp,
336 fpsize);
Jeremy Kerr33714882010-01-30 01:45:26 -0700337 tag = be32_to_cpup((__be32 *)(*p));
Grant Likelybbd33932009-11-23 20:07:00 -0700338 }
339 if (tag != OF_DT_END_NODE) {
340 pr_err("Weird tag at end of node: %x\n", tag);
341 return mem;
342 }
343 *p += 4;
344 return mem;
345}
Grant Likely41f88002009-11-23 20:07:01 -0700346
Stephen Neuendorfferfe140422010-11-18 15:55:02 -0800347/**
348 * __unflatten_device_tree - create tree of device_nodes from flat blob
349 *
350 * unflattens a device-tree, creating the
351 * tree of struct device_node. It also fills the "name" and "type"
352 * pointers of the nodes so the normal device-tree walking functions
353 * can be used.
354 * @blob: The blob to expand
355 * @mynodes: The device_node tree created by the call
356 * @dt_alloc: An allocator that provides a virtual address to memory
357 * for the resulting tree
358 */
Andres Salomona7006c92011-03-17 17:32:35 -0700359static void __unflatten_device_tree(struct boot_param_header *blob,
Stephen Neuendorfferfe140422010-11-18 15:55:02 -0800360 struct device_node **mynodes,
361 void * (*dt_alloc)(u64 size, u64 align))
362{
363 unsigned long start, mem, size;
364 struct device_node **allnextp = mynodes;
365
366 pr_debug(" -> unflatten_device_tree()\n");
367
368 if (!blob) {
369 pr_debug("No device tree pointer\n");
370 return;
371 }
372
373 pr_debug("Unflattening device tree:\n");
374 pr_debug("magic: %08x\n", be32_to_cpu(blob->magic));
375 pr_debug("size: %08x\n", be32_to_cpu(blob->totalsize));
376 pr_debug("version: %08x\n", be32_to_cpu(blob->version));
377
378 if (be32_to_cpu(blob->magic) != OF_DT_HEADER) {
379 pr_err("Invalid device tree blob header\n");
380 return;
381 }
382
383 /* First pass, scan for size */
384 start = ((unsigned long)blob) +
385 be32_to_cpu(blob->off_dt_struct);
386 size = unflatten_dt_node(blob, 0, &start, NULL, NULL, 0);
387 size = (size | 3) + 1;
388
389 pr_debug(" size is %lx, allocating...\n", size);
390
391 /* Allocate memory for the expanded device tree */
392 mem = (unsigned long)
393 dt_alloc(size + 4, __alignof__(struct device_node));
394
395 ((__be32 *)mem)[size / 4] = cpu_to_be32(0xdeadbeef);
396
397 pr_debug(" unflattening %lx...\n", mem);
398
399 /* Second pass, do actual unflattening */
400 start = ((unsigned long)blob) +
401 be32_to_cpu(blob->off_dt_struct);
402 unflatten_dt_node(blob, mem, &start, NULL, &allnextp, 0);
403 if (be32_to_cpup((__be32 *)start) != OF_DT_END)
404 pr_warning("Weird tag at end of tree: %08x\n", *((u32 *)start));
405 if (be32_to_cpu(((__be32 *)mem)[size / 4]) != 0xdeadbeef)
406 pr_warning("End of tree marker overwritten: %08x\n",
407 be32_to_cpu(((__be32 *)mem)[size / 4]));
408 *allnextp = NULL;
409
410 pr_debug(" <- unflatten_device_tree()\n");
411}
412
413static void *kernel_tree_alloc(u64 size, u64 align)
414{
415 return kzalloc(size, GFP_KERNEL);
416}
417
418/**
419 * of_fdt_unflatten_tree - create tree of device_nodes from flat blob
420 *
421 * unflattens the device-tree passed by the firmware, creating the
422 * tree of struct device_node. It also fills the "name" and "type"
423 * pointers of the nodes so the normal device-tree walking functions
424 * can be used.
425 */
426void of_fdt_unflatten_tree(unsigned long *blob,
427 struct device_node **mynodes)
428{
429 struct boot_param_header *device_tree =
430 (struct boot_param_header *)blob;
431 __unflatten_device_tree(device_tree, mynodes, &kernel_tree_alloc);
432}
433EXPORT_SYMBOL_GPL(of_fdt_unflatten_tree);
434
Stephen Neuendorffer57d00ec2010-11-18 15:55:01 -0800435/* Everything below here references initial_boot_params directly. */
436int __initdata dt_root_addr_cells;
437int __initdata dt_root_size_cells;
438
439struct boot_param_header *initial_boot_params;
440
441#ifdef CONFIG_OF_EARLY_FLATTREE
442
443/**
444 * of_scan_flat_dt - scan flattened tree blob and call callback on each.
445 * @it: callback function
446 * @data: context data pointer
447 *
448 * This function is used to scan the flattened device-tree, it is
449 * used to extract the memory information at boot before we can
450 * unflatten the tree
451 */
452int __init of_scan_flat_dt(int (*it)(unsigned long node,
453 const char *uname, int depth,
454 void *data),
455 void *data)
456{
457 unsigned long p = ((unsigned long)initial_boot_params) +
458 be32_to_cpu(initial_boot_params->off_dt_struct);
459 int rc = 0;
460 int depth = -1;
461
462 do {
463 u32 tag = be32_to_cpup((__be32 *)p);
Fabio Estevame55b0822012-11-12 18:30:49 -0200464 const char *pathp;
Stephen Neuendorffer57d00ec2010-11-18 15:55:01 -0800465
466 p += 4;
467 if (tag == OF_DT_END_NODE) {
468 depth--;
469 continue;
470 }
471 if (tag == OF_DT_NOP)
472 continue;
473 if (tag == OF_DT_END)
474 break;
475 if (tag == OF_DT_PROP) {
476 u32 sz = be32_to_cpup((__be32 *)p);
477 p += 8;
478 if (be32_to_cpu(initial_boot_params->version) < 0x10)
479 p = ALIGN(p, sz >= 8 ? 8 : 4);
480 p += sz;
481 p = ALIGN(p, 4);
482 continue;
483 }
484 if (tag != OF_DT_BEGIN_NODE) {
485 pr_err("Invalid tag %x in flat device tree!\n", tag);
486 return -EINVAL;
487 }
488 depth++;
489 pathp = (char *)p;
490 p = ALIGN(p + strlen(pathp) + 1, 4);
Andy Shevchenko375da3a2012-12-17 16:01:28 -0800491 if (*pathp == '/')
492 pathp = kbasename(pathp);
Stephen Neuendorffer57d00ec2010-11-18 15:55:01 -0800493 rc = it(p, pathp, depth, data);
494 if (rc != 0)
495 break;
496 } while (1);
497
498 return rc;
499}
500
501/**
502 * of_get_flat_dt_root - find the root node in the flat blob
503 */
504unsigned long __init of_get_flat_dt_root(void)
505{
506 unsigned long p = ((unsigned long)initial_boot_params) +
507 be32_to_cpu(initial_boot_params->off_dt_struct);
508
509 while (be32_to_cpup((__be32 *)p) == OF_DT_NOP)
510 p += 4;
511 BUG_ON(be32_to_cpup((__be32 *)p) != OF_DT_BEGIN_NODE);
512 p += 4;
513 return ALIGN(p + strlen((char *)p) + 1, 4);
514}
515
516/**
517 * of_get_flat_dt_prop - Given a node in the flat blob, return the property ptr
518 *
519 * This function can be used within scan_flattened_dt callback to get
520 * access to properties
521 */
522void *__init of_get_flat_dt_prop(unsigned long node, const char *name,
523 unsigned long *size)
524{
525 return of_fdt_get_property(initial_boot_params, node, name, size);
526}
527
528/**
529 * of_flat_dt_is_compatible - Return true if given node has compat in compatible list
530 * @node: node to test
531 * @compat: compatible string to compare with compatible list.
532 */
533int __init of_flat_dt_is_compatible(unsigned long node, const char *compat)
534{
535 return of_fdt_is_compatible(initial_boot_params, node, compat);
536}
537
Grant Likelya4f740c2010-10-30 11:49:09 -0400538/**
539 * of_flat_dt_match - Return true if node matches a list of compatible values
540 */
Uwe Kleine-König7b482c82011-12-20 22:56:45 +0100541int __init of_flat_dt_match(unsigned long node, const char *const *compat)
Grant Likelya4f740c2010-10-30 11:49:09 -0400542{
543 return of_fdt_match(initial_boot_params, node, compat);
544}
545
Grant Likelyf7b3a832009-11-24 03:26:58 -0700546#ifdef CONFIG_BLK_DEV_INITRD
547/**
548 * early_init_dt_check_for_initrd - Decode initrd location from flat tree
549 * @node: reference to node containing initrd location ('chosen')
550 */
551void __init early_init_dt_check_for_initrd(unsigned long node)
552{
Jeremy Kerr1406bc22010-01-30 01:31:21 -0700553 unsigned long start, end, len;
Jeremy Kerr33714882010-01-30 01:45:26 -0700554 __be32 *prop;
Grant Likelyf7b3a832009-11-24 03:26:58 -0700555
556 pr_debug("Looking for initrd properties... ");
557
558 prop = of_get_flat_dt_prop(node, "linux,initrd-start", &len);
Jeremy Kerr1406bc22010-01-30 01:31:21 -0700559 if (!prop)
560 return;
561 start = of_read_ulong(prop, len/4);
Grant Likelyf7b3a832009-11-24 03:26:58 -0700562
Jeremy Kerr1406bc22010-01-30 01:31:21 -0700563 prop = of_get_flat_dt_prop(node, "linux,initrd-end", &len);
564 if (!prop)
565 return;
566 end = of_read_ulong(prop, len/4);
Grant Likelyf7b3a832009-11-24 03:26:58 -0700567
Jeremy Kerr1406bc22010-01-30 01:31:21 -0700568 early_init_dt_setup_initrd_arch(start, end);
569 pr_debug("initrd_start=0x%lx initrd_end=0x%lx\n", start, end);
Grant Likelyf7b3a832009-11-24 03:26:58 -0700570}
571#else
572inline void early_init_dt_check_for_initrd(unsigned long node)
573{
574}
575#endif /* CONFIG_BLK_DEV_INITRD */
576
Grant Likely41f88002009-11-23 20:07:01 -0700577/**
Grant Likelyf00abd92009-11-24 03:27:10 -0700578 * early_init_dt_scan_root - fetch the top level address and size cells
579 */
580int __init early_init_dt_scan_root(unsigned long node, const char *uname,
581 int depth, void *data)
582{
Jeremy Kerr33714882010-01-30 01:45:26 -0700583 __be32 *prop;
Grant Likelyf00abd92009-11-24 03:27:10 -0700584
585 if (depth != 0)
586 return 0;
587
Jeremy Kerr33714882010-01-30 01:45:26 -0700588 dt_root_size_cells = OF_ROOT_NODE_SIZE_CELLS_DEFAULT;
589 dt_root_addr_cells = OF_ROOT_NODE_ADDR_CELLS_DEFAULT;
590
Grant Likelyf00abd92009-11-24 03:27:10 -0700591 prop = of_get_flat_dt_prop(node, "#size-cells", NULL);
Jeremy Kerr33714882010-01-30 01:45:26 -0700592 if (prop)
593 dt_root_size_cells = be32_to_cpup(prop);
Grant Likelyf00abd92009-11-24 03:27:10 -0700594 pr_debug("dt_root_size_cells = %x\n", dt_root_size_cells);
595
596 prop = of_get_flat_dt_prop(node, "#address-cells", NULL);
Jeremy Kerr33714882010-01-30 01:45:26 -0700597 if (prop)
598 dt_root_addr_cells = be32_to_cpup(prop);
Grant Likelyf00abd92009-11-24 03:27:10 -0700599 pr_debug("dt_root_addr_cells = %x\n", dt_root_addr_cells);
600
601 /* break now */
602 return 1;
603}
604
Jeremy Kerr2e89e682010-01-30 01:41:49 -0700605u64 __init dt_mem_next_cell(int s, __be32 **cellp)
Grant Likely83f7a062009-11-24 03:37:56 -0700606{
Jeremy Kerr2e89e682010-01-30 01:41:49 -0700607 __be32 *p = *cellp;
Grant Likely83f7a062009-11-24 03:37:56 -0700608
609 *cellp = p + s;
610 return of_read_number(p, s);
611}
612
Grant Likely51975db2010-02-01 21:34:14 -0700613/**
614 * early_init_dt_scan_memory - Look for an parse memory nodes
615 */
616int __init early_init_dt_scan_memory(unsigned long node, const char *uname,
617 int depth, void *data)
618{
619 char *type = of_get_flat_dt_prop(node, "device_type", NULL);
620 __be32 *reg, *endp;
621 unsigned long l;
622
623 /* We are scanning "memory" nodes only */
624 if (type == NULL) {
625 /*
626 * The longtrail doesn't have a device_type on the
627 * /memory node, so look for the node called /memory@0.
628 */
629 if (depth != 1 || strcmp(uname, "memory@0") != 0)
630 return 0;
631 } else if (strcmp(type, "memory") != 0)
632 return 0;
633
634 reg = of_get_flat_dt_prop(node, "linux,usable-memory", &l);
635 if (reg == NULL)
636 reg = of_get_flat_dt_prop(node, "reg", &l);
637 if (reg == NULL)
638 return 0;
639
640 endp = reg + (l / sizeof(__be32));
641
642 pr_debug("memory scan node %s, reg size %ld, data: %x %x %x %x,\n",
643 uname, l, reg[0], reg[1], reg[2], reg[3]);
644
645 while ((endp - reg) >= (dt_root_addr_cells + dt_root_size_cells)) {
646 u64 base, size;
647
648 base = dt_mem_next_cell(dt_root_addr_cells, &reg);
649 size = dt_mem_next_cell(dt_root_size_cells, &reg);
650
651 if (size == 0)
652 continue;
653 pr_debug(" - %llx , %llx\n", (unsigned long long)base,
654 (unsigned long long)size);
655
656 early_init_dt_add_memory_arch(base, size);
657 }
658
659 return 0;
660}
661
Grant Likely86e03222009-12-10 23:42:21 -0700662int __init early_init_dt_scan_chosen(unsigned long node, const char *uname,
663 int depth, void *data)
664{
665 unsigned long l;
666 char *p;
667
668 pr_debug("search \"chosen\", depth: %d, uname: %s\n", depth, uname);
669
Grant Likely85f60ae2011-04-29 00:18:16 -0600670 if (depth != 1 || !data ||
Grant Likely86e03222009-12-10 23:42:21 -0700671 (strcmp(uname, "chosen") != 0 && strcmp(uname, "chosen@0") != 0))
672 return 0;
673
674 early_init_dt_check_for_initrd(node);
675
Lucas De Marchi25985ed2011-03-30 22:57:33 -0300676 /* Retrieve command line */
Grant Likely86e03222009-12-10 23:42:21 -0700677 p = of_get_flat_dt_prop(node, "bootargs", &l);
678 if (p != NULL && l > 0)
Grant Likely85f60ae2011-04-29 00:18:16 -0600679 strlcpy(data, p, min((int)l, COMMAND_LINE_SIZE));
Grant Likely86e03222009-12-10 23:42:21 -0700680
Benjamin Herrenschmidt78b782c2011-09-19 18:50:15 +0000681 /*
682 * CONFIG_CMDLINE is meant to be a default in case nothing else
683 * managed to set the command line, unless CONFIG_CMDLINE_FORCE
684 * is set in which case we override whatever was found earlier.
685 */
Grant Likely86e03222009-12-10 23:42:21 -0700686#ifdef CONFIG_CMDLINE
687#ifndef CONFIG_CMDLINE_FORCE
Benjamin Herrenschmidt78b782c2011-09-19 18:50:15 +0000688 if (!((char *)data)[0])
Grant Likely86e03222009-12-10 23:42:21 -0700689#endif
Grant Likely85f60ae2011-04-29 00:18:16 -0600690 strlcpy(data, CONFIG_CMDLINE, COMMAND_LINE_SIZE);
Grant Likely86e03222009-12-10 23:42:21 -0700691#endif /* CONFIG_CMDLINE */
692
Grant Likely85f60ae2011-04-29 00:18:16 -0600693 pr_debug("Command line is: %s\n", (char*)data);
Grant Likely86e03222009-12-10 23:42:21 -0700694
695 /* break now */
696 return 1;
697}
698
Grant Likelyf00abd92009-11-24 03:27:10 -0700699/**
Grant Likely41f88002009-11-23 20:07:01 -0700700 * unflatten_device_tree - create tree of device_nodes from flat blob
701 *
702 * unflattens the device-tree passed by the firmware, creating the
703 * tree of struct device_node. It also fills the "name" and "type"
704 * pointers of the nodes so the normal device-tree walking functions
705 * can be used.
706 */
707void __init unflatten_device_tree(void)
708{
Randy Dunlap465aac62012-11-30 10:01:51 +0000709 __unflatten_device_tree(initial_boot_params, &of_allnodes,
Grant Likely672c5442011-01-13 15:36:09 -0700710 early_init_dt_alloc_memory_arch);
Grant Likely41f88002009-11-23 20:07:01 -0700711
Shawn Guo611cad72011-08-15 15:28:14 +0800712 /* Get pointer to "/chosen" and "/aliasas" nodes for use everywhere */
713 of_alias_scan(early_init_dt_alloc_memory_arch);
Grant Likely41f88002009-11-23 20:07:01 -0700714}
Stephen Neuendorffere6ce1322010-11-18 15:54:56 -0800715
716#endif /* CONFIG_OF_EARLY_FLATTREE */