blob: fd85fa298e0f053eb666fc0c6060e3779731545f [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
Grant Likely86e03222009-12-10 23:42:21 -070021#ifdef CONFIG_PPC
22#include <asm/machdep.h>
23#endif /* CONFIG_PPC */
24
Jeremy Kerr4ef7b372010-02-14 07:13:47 -070025#include <asm/page.h>
26
Stephen Neuendorffer9706a362010-11-18 15:54:59 -080027char *of_fdt_get_string(struct boot_param_header *blob, u32 offset)
28{
29 return ((char *)blob) +
30 be32_to_cpu(blob->off_dt_strings) + offset;
31}
32
33/**
34 * of_fdt_get_property - Given a node in the given flat blob, return
35 * the property ptr
36 */
37void *of_fdt_get_property(struct boot_param_header *blob,
38 unsigned long node, const char *name,
39 unsigned long *size)
40{
41 unsigned long p = node;
42
43 do {
44 u32 tag = be32_to_cpup((__be32 *)p);
45 u32 sz, noff;
46 const char *nstr;
47
48 p += 4;
49 if (tag == OF_DT_NOP)
50 continue;
51 if (tag != OF_DT_PROP)
52 return NULL;
53
54 sz = be32_to_cpup((__be32 *)p);
55 noff = be32_to_cpup((__be32 *)(p + 4));
56 p += 8;
57 if (be32_to_cpu(blob->version) < 0x10)
58 p = ALIGN(p, sz >= 8 ? 8 : 4);
59
60 nstr = of_fdt_get_string(blob, noff);
61 if (nstr == NULL) {
62 pr_warning("Can't find property index name !\n");
63 return NULL;
64 }
65 if (strcmp(name, nstr) == 0) {
66 if (size)
67 *size = sz;
68 return (void *)p;
69 }
70 p += sz;
71 p = ALIGN(p, 4);
72 } while (1);
73}
74
75/**
76 * of_fdt_is_compatible - Return true if given node from the given blob has
77 * compat in its compatible list
78 * @blob: A device tree blob
79 * @node: node to test
80 * @compat: compatible string to compare with compatible list.
Grant Likelya4f740c2010-10-30 11:49:09 -040081 *
82 * On match, returns a non-zero value with smaller values returned for more
83 * specific compatible values.
Stephen Neuendorffer9706a362010-11-18 15:54:59 -080084 */
85int of_fdt_is_compatible(struct boot_param_header *blob,
86 unsigned long node, const char *compat)
87{
88 const char *cp;
Grant Likelya4f740c2010-10-30 11:49:09 -040089 unsigned long cplen, l, score = 0;
Stephen Neuendorffer9706a362010-11-18 15:54:59 -080090
91 cp = of_fdt_get_property(blob, node, "compatible", &cplen);
92 if (cp == NULL)
93 return 0;
94 while (cplen > 0) {
Grant Likelya4f740c2010-10-30 11:49:09 -040095 score++;
Stephen Neuendorffer9706a362010-11-18 15:54:59 -080096 if (of_compat_cmp(cp, compat, strlen(compat)) == 0)
Grant Likelya4f740c2010-10-30 11:49:09 -040097 return score;
Stephen Neuendorffer9706a362010-11-18 15:54:59 -080098 l = strlen(cp) + 1;
99 cp += l;
100 cplen -= l;
101 }
102
103 return 0;
104}
105
Grant Likelya4f740c2010-10-30 11:49:09 -0400106/**
107 * of_fdt_match - Return true if node matches a list of compatible values
108 */
109int of_fdt_match(struct boot_param_header *blob, unsigned long node,
110 const char **compat)
111{
112 unsigned int tmp, score = 0;
113
114 if (!compat)
115 return 0;
116
117 while (*compat) {
118 tmp = of_fdt_is_compatible(blob, node, *compat);
119 if (tmp && (score == 0 || (tmp < score)))
120 score = tmp;
121 compat++;
122 }
123
124 return score;
125}
126
Stephen Neuendorffera40d6c42010-11-18 15:55:00 -0800127static void *unflatten_dt_alloc(unsigned long *mem, unsigned long size,
Grant Likelybbd33932009-11-23 20:07:00 -0700128 unsigned long align)
129{
130 void *res;
131
Grant Likelyf1d4c3a2010-06-25 12:16:52 -0600132 *mem = ALIGN(*mem, align);
Grant Likelybbd33932009-11-23 20:07:00 -0700133 res = (void *)*mem;
134 *mem += size;
135
136 return res;
137}
138
139/**
140 * unflatten_dt_node - Alloc and populate a device_node from the flat tree
Stephen Neuendorffera40d6c42010-11-18 15:55:00 -0800141 * @blob: The parent device tree blob
Andres Salomona7006c92011-03-17 17:32:35 -0700142 * @mem: Memory chunk to use for allocating device nodes and properties
Grant Likelybbd33932009-11-23 20:07:00 -0700143 * @p: pointer to node in flat tree
144 * @dad: Parent struct device_node
145 * @allnextpp: pointer to ->allnext from last allocated device_node
146 * @fpsize: Size of the node path up at the current depth.
147 */
Andres Salomona7006c92011-03-17 17:32:35 -0700148static unsigned long unflatten_dt_node(struct boot_param_header *blob,
Stephen Neuendorffera40d6c42010-11-18 15:55:00 -0800149 unsigned long mem,
150 unsigned long *p,
151 struct device_node *dad,
152 struct device_node ***allnextpp,
153 unsigned long fpsize)
Grant Likelybbd33932009-11-23 20:07:00 -0700154{
155 struct device_node *np;
156 struct property *pp, **prev_pp = NULL;
157 char *pathp;
158 u32 tag;
159 unsigned int l, allocl;
160 int has_name = 0;
161 int new_format = 0;
162
Jeremy Kerr33714882010-01-30 01:45:26 -0700163 tag = be32_to_cpup((__be32 *)(*p));
Grant Likelybbd33932009-11-23 20:07:00 -0700164 if (tag != OF_DT_BEGIN_NODE) {
165 pr_err("Weird tag at start of node: %x\n", tag);
166 return mem;
167 }
168 *p += 4;
169 pathp = (char *)*p;
170 l = allocl = strlen(pathp) + 1;
Grant Likelyf1d4c3a2010-06-25 12:16:52 -0600171 *p = ALIGN(*p + l, 4);
Grant Likelybbd33932009-11-23 20:07:00 -0700172
173 /* version 0x10 has a more compact unit name here instead of the full
174 * path. we accumulate the full path size using "fpsize", we'll rebuild
175 * it later. We detect this because the first character of the name is
176 * not '/'.
177 */
178 if ((*pathp) != '/') {
179 new_format = 1;
180 if (fpsize == 0) {
181 /* root node: special case. fpsize accounts for path
182 * plus terminating zero. root node only has '/', so
183 * fpsize should be 2, but we want to avoid the first
184 * level nodes to have two '/' so we use fpsize 1 here
185 */
186 fpsize = 1;
187 allocl = 2;
188 } else {
189 /* account for '/' and path size minus terminal 0
190 * already in 'l'
191 */
192 fpsize += l;
193 allocl = fpsize;
194 }
195 }
196
197 np = unflatten_dt_alloc(&mem, sizeof(struct device_node) + allocl,
198 __alignof__(struct device_node));
199 if (allnextpp) {
200 memset(np, 0, sizeof(*np));
201 np->full_name = ((char *)np) + sizeof(struct device_node);
202 if (new_format) {
203 char *fn = np->full_name;
204 /* rebuild full path for new format */
205 if (dad && dad->parent) {
206 strcpy(fn, dad->full_name);
207#ifdef DEBUG
208 if ((strlen(fn) + l + 1) != allocl) {
209 pr_debug("%s: p: %d, l: %d, a: %d\n",
210 pathp, (int)strlen(fn),
211 l, allocl);
212 }
213#endif
214 fn += strlen(fn);
215 }
216 *(fn++) = '/';
217 memcpy(fn, pathp, l);
218 } else
219 memcpy(np->full_name, pathp, l);
220 prev_pp = &np->properties;
221 **allnextpp = np;
222 *allnextpp = &np->allnext;
223 if (dad != NULL) {
224 np->parent = dad;
225 /* we temporarily use the next field as `last_child'*/
226 if (dad->next == NULL)
227 dad->child = np;
228 else
229 dad->next->sibling = np;
230 dad->next = np;
231 }
232 kref_init(&np->kref);
233 }
Andres Salomona7006c92011-03-17 17:32:35 -0700234 /* process properties */
Grant Likelybbd33932009-11-23 20:07:00 -0700235 while (1) {
236 u32 sz, noff;
237 char *pname;
238
Jeremy Kerr33714882010-01-30 01:45:26 -0700239 tag = be32_to_cpup((__be32 *)(*p));
Grant Likelybbd33932009-11-23 20:07:00 -0700240 if (tag == OF_DT_NOP) {
241 *p += 4;
242 continue;
243 }
244 if (tag != OF_DT_PROP)
245 break;
246 *p += 4;
Jeremy Kerr33714882010-01-30 01:45:26 -0700247 sz = be32_to_cpup((__be32 *)(*p));
248 noff = be32_to_cpup((__be32 *)((*p) + 4));
Grant Likelybbd33932009-11-23 20:07:00 -0700249 *p += 8;
Stephen Neuendorffera40d6c42010-11-18 15:55:00 -0800250 if (be32_to_cpu(blob->version) < 0x10)
Grant Likelyf1d4c3a2010-06-25 12:16:52 -0600251 *p = ALIGN(*p, sz >= 8 ? 8 : 4);
Grant Likelybbd33932009-11-23 20:07:00 -0700252
Stephen Neuendorffera40d6c42010-11-18 15:55:00 -0800253 pname = of_fdt_get_string(blob, noff);
Grant Likelybbd33932009-11-23 20:07:00 -0700254 if (pname == NULL) {
255 pr_info("Can't find property name in list !\n");
256 break;
257 }
258 if (strcmp(pname, "name") == 0)
259 has_name = 1;
260 l = strlen(pname) + 1;
261 pp = unflatten_dt_alloc(&mem, sizeof(struct property),
262 __alignof__(struct property));
263 if (allnextpp) {
David Gibson04b954a2010-02-01 21:34:15 -0700264 /* We accept flattened tree phandles either in
265 * ePAPR-style "phandle" properties, or the
266 * legacy "linux,phandle" properties. If both
267 * appear and have different values, things
268 * will get weird. Don't do that. */
269 if ((strcmp(pname, "phandle") == 0) ||
270 (strcmp(pname, "linux,phandle") == 0)) {
Grant Likely6016a362010-01-28 14:06:53 -0700271 if (np->phandle == 0)
Grant Likely9a6b2e52010-07-23 01:48:25 -0600272 np->phandle = be32_to_cpup((__be32*)*p);
Grant Likelybbd33932009-11-23 20:07:00 -0700273 }
David Gibson04b954a2010-02-01 21:34:15 -0700274 /* And we process the "ibm,phandle" property
275 * used in pSeries dynamic device tree
276 * stuff */
Grant Likelybbd33932009-11-23 20:07:00 -0700277 if (strcmp(pname, "ibm,phandle") == 0)
Grant Likely9a6b2e52010-07-23 01:48:25 -0600278 np->phandle = be32_to_cpup((__be32 *)*p);
Grant Likelybbd33932009-11-23 20:07:00 -0700279 pp->name = pname;
280 pp->length = sz;
281 pp->value = (void *)*p;
282 *prev_pp = pp;
283 prev_pp = &pp->next;
284 }
Grant Likelyf1d4c3a2010-06-25 12:16:52 -0600285 *p = ALIGN((*p) + sz, 4);
Grant Likelybbd33932009-11-23 20:07:00 -0700286 }
287 /* with version 0x10 we may not have the name property, recreate
288 * it here from the unit name if absent
289 */
290 if (!has_name) {
291 char *p1 = pathp, *ps = pathp, *pa = NULL;
292 int sz;
293
294 while (*p1) {
295 if ((*p1) == '@')
296 pa = p1;
297 if ((*p1) == '/')
298 ps = p1 + 1;
299 p1++;
300 }
301 if (pa < ps)
302 pa = p1;
303 sz = (pa - ps) + 1;
304 pp = unflatten_dt_alloc(&mem, sizeof(struct property) + sz,
305 __alignof__(struct property));
306 if (allnextpp) {
307 pp->name = "name";
308 pp->length = sz;
309 pp->value = pp + 1;
310 *prev_pp = pp;
311 prev_pp = &pp->next;
312 memcpy(pp->value, ps, sz - 1);
313 ((char *)pp->value)[sz - 1] = 0;
314 pr_debug("fixed up name for %s -> %s\n", pathp,
315 (char *)pp->value);
316 }
317 }
318 if (allnextpp) {
319 *prev_pp = NULL;
320 np->name = of_get_property(np, "name", NULL);
321 np->type = of_get_property(np, "device_type", NULL);
322
323 if (!np->name)
324 np->name = "<NULL>";
325 if (!np->type)
326 np->type = "<NULL>";
327 }
Jason Gunthorpe7f809e12010-03-26 22:09:56 -0600328 while (tag == OF_DT_BEGIN_NODE || tag == OF_DT_NOP) {
329 if (tag == OF_DT_NOP)
330 *p += 4;
331 else
Stephen Neuendorffera40d6c42010-11-18 15:55:00 -0800332 mem = unflatten_dt_node(blob, mem, p, np, allnextpp,
333 fpsize);
Jeremy Kerr33714882010-01-30 01:45:26 -0700334 tag = be32_to_cpup((__be32 *)(*p));
Grant Likelybbd33932009-11-23 20:07:00 -0700335 }
336 if (tag != OF_DT_END_NODE) {
337 pr_err("Weird tag at end of node: %x\n", tag);
338 return mem;
339 }
340 *p += 4;
341 return mem;
342}
Grant Likely41f88002009-11-23 20:07:01 -0700343
Stephen Neuendorfferfe140422010-11-18 15:55:02 -0800344/**
345 * __unflatten_device_tree - create tree of device_nodes from flat blob
346 *
347 * unflattens a device-tree, creating the
348 * tree of struct device_node. It also fills the "name" and "type"
349 * pointers of the nodes so the normal device-tree walking functions
350 * can be used.
351 * @blob: The blob to expand
352 * @mynodes: The device_node tree created by the call
353 * @dt_alloc: An allocator that provides a virtual address to memory
354 * for the resulting tree
355 */
Andres Salomona7006c92011-03-17 17:32:35 -0700356static void __unflatten_device_tree(struct boot_param_header *blob,
Stephen Neuendorfferfe140422010-11-18 15:55:02 -0800357 struct device_node **mynodes,
358 void * (*dt_alloc)(u64 size, u64 align))
359{
360 unsigned long start, mem, size;
361 struct device_node **allnextp = mynodes;
362
363 pr_debug(" -> unflatten_device_tree()\n");
364
365 if (!blob) {
366 pr_debug("No device tree pointer\n");
367 return;
368 }
369
370 pr_debug("Unflattening device tree:\n");
371 pr_debug("magic: %08x\n", be32_to_cpu(blob->magic));
372 pr_debug("size: %08x\n", be32_to_cpu(blob->totalsize));
373 pr_debug("version: %08x\n", be32_to_cpu(blob->version));
374
375 if (be32_to_cpu(blob->magic) != OF_DT_HEADER) {
376 pr_err("Invalid device tree blob header\n");
377 return;
378 }
379
380 /* First pass, scan for size */
381 start = ((unsigned long)blob) +
382 be32_to_cpu(blob->off_dt_struct);
383 size = unflatten_dt_node(blob, 0, &start, NULL, NULL, 0);
384 size = (size | 3) + 1;
385
386 pr_debug(" size is %lx, allocating...\n", size);
387
388 /* Allocate memory for the expanded device tree */
389 mem = (unsigned long)
390 dt_alloc(size + 4, __alignof__(struct device_node));
391
392 ((__be32 *)mem)[size / 4] = cpu_to_be32(0xdeadbeef);
393
394 pr_debug(" unflattening %lx...\n", mem);
395
396 /* Second pass, do actual unflattening */
397 start = ((unsigned long)blob) +
398 be32_to_cpu(blob->off_dt_struct);
399 unflatten_dt_node(blob, mem, &start, NULL, &allnextp, 0);
400 if (be32_to_cpup((__be32 *)start) != OF_DT_END)
401 pr_warning("Weird tag at end of tree: %08x\n", *((u32 *)start));
402 if (be32_to_cpu(((__be32 *)mem)[size / 4]) != 0xdeadbeef)
403 pr_warning("End of tree marker overwritten: %08x\n",
404 be32_to_cpu(((__be32 *)mem)[size / 4]));
405 *allnextp = NULL;
406
407 pr_debug(" <- unflatten_device_tree()\n");
408}
409
410static void *kernel_tree_alloc(u64 size, u64 align)
411{
412 return kzalloc(size, GFP_KERNEL);
413}
414
415/**
416 * of_fdt_unflatten_tree - create tree of device_nodes from flat blob
417 *
418 * unflattens the device-tree passed by the firmware, creating the
419 * tree of struct device_node. It also fills the "name" and "type"
420 * pointers of the nodes so the normal device-tree walking functions
421 * can be used.
422 */
423void of_fdt_unflatten_tree(unsigned long *blob,
424 struct device_node **mynodes)
425{
426 struct boot_param_header *device_tree =
427 (struct boot_param_header *)blob;
428 __unflatten_device_tree(device_tree, mynodes, &kernel_tree_alloc);
429}
430EXPORT_SYMBOL_GPL(of_fdt_unflatten_tree);
431
Stephen Neuendorffer57d00ec2010-11-18 15:55:01 -0800432/* Everything below here references initial_boot_params directly. */
433int __initdata dt_root_addr_cells;
434int __initdata dt_root_size_cells;
435
436struct boot_param_header *initial_boot_params;
437
438#ifdef CONFIG_OF_EARLY_FLATTREE
439
440/**
441 * of_scan_flat_dt - scan flattened tree blob and call callback on each.
442 * @it: callback function
443 * @data: context data pointer
444 *
445 * This function is used to scan the flattened device-tree, it is
446 * used to extract the memory information at boot before we can
447 * unflatten the tree
448 */
449int __init of_scan_flat_dt(int (*it)(unsigned long node,
450 const char *uname, int depth,
451 void *data),
452 void *data)
453{
454 unsigned long p = ((unsigned long)initial_boot_params) +
455 be32_to_cpu(initial_boot_params->off_dt_struct);
456 int rc = 0;
457 int depth = -1;
458
459 do {
460 u32 tag = be32_to_cpup((__be32 *)p);
461 char *pathp;
462
463 p += 4;
464 if (tag == OF_DT_END_NODE) {
465 depth--;
466 continue;
467 }
468 if (tag == OF_DT_NOP)
469 continue;
470 if (tag == OF_DT_END)
471 break;
472 if (tag == OF_DT_PROP) {
473 u32 sz = be32_to_cpup((__be32 *)p);
474 p += 8;
475 if (be32_to_cpu(initial_boot_params->version) < 0x10)
476 p = ALIGN(p, sz >= 8 ? 8 : 4);
477 p += sz;
478 p = ALIGN(p, 4);
479 continue;
480 }
481 if (tag != OF_DT_BEGIN_NODE) {
482 pr_err("Invalid tag %x in flat device tree!\n", tag);
483 return -EINVAL;
484 }
485 depth++;
486 pathp = (char *)p;
487 p = ALIGN(p + strlen(pathp) + 1, 4);
488 if ((*pathp) == '/') {
489 char *lp, *np;
490 for (lp = NULL, np = pathp; *np; np++)
491 if ((*np) == '/')
492 lp = np+1;
493 if (lp != NULL)
494 pathp = lp;
495 }
496 rc = it(p, pathp, depth, data);
497 if (rc != 0)
498 break;
499 } while (1);
500
501 return rc;
502}
503
504/**
505 * of_get_flat_dt_root - find the root node in the flat blob
506 */
507unsigned long __init of_get_flat_dt_root(void)
508{
509 unsigned long p = ((unsigned long)initial_boot_params) +
510 be32_to_cpu(initial_boot_params->off_dt_struct);
511
512 while (be32_to_cpup((__be32 *)p) == OF_DT_NOP)
513 p += 4;
514 BUG_ON(be32_to_cpup((__be32 *)p) != OF_DT_BEGIN_NODE);
515 p += 4;
516 return ALIGN(p + strlen((char *)p) + 1, 4);
517}
518
519/**
520 * of_get_flat_dt_prop - Given a node in the flat blob, return the property ptr
521 *
522 * This function can be used within scan_flattened_dt callback to get
523 * access to properties
524 */
525void *__init of_get_flat_dt_prop(unsigned long node, const char *name,
526 unsigned long *size)
527{
528 return of_fdt_get_property(initial_boot_params, node, name, size);
529}
530
531/**
532 * of_flat_dt_is_compatible - Return true if given node has compat in compatible list
533 * @node: node to test
534 * @compat: compatible string to compare with compatible list.
535 */
536int __init of_flat_dt_is_compatible(unsigned long node, const char *compat)
537{
538 return of_fdt_is_compatible(initial_boot_params, node, compat);
539}
540
Grant Likelya4f740c2010-10-30 11:49:09 -0400541/**
542 * of_flat_dt_match - Return true if node matches a list of compatible values
543 */
544int __init of_flat_dt_match(unsigned long node, const char **compat)
545{
546 return of_fdt_match(initial_boot_params, node, compat);
547}
548
Grant Likelyf7b3a832009-11-24 03:26:58 -0700549#ifdef CONFIG_BLK_DEV_INITRD
550/**
551 * early_init_dt_check_for_initrd - Decode initrd location from flat tree
552 * @node: reference to node containing initrd location ('chosen')
553 */
554void __init early_init_dt_check_for_initrd(unsigned long node)
555{
Jeremy Kerr1406bc22010-01-30 01:31:21 -0700556 unsigned long start, end, len;
Jeremy Kerr33714882010-01-30 01:45:26 -0700557 __be32 *prop;
Grant Likelyf7b3a832009-11-24 03:26:58 -0700558
559 pr_debug("Looking for initrd properties... ");
560
561 prop = of_get_flat_dt_prop(node, "linux,initrd-start", &len);
Jeremy Kerr1406bc22010-01-30 01:31:21 -0700562 if (!prop)
563 return;
564 start = of_read_ulong(prop, len/4);
Grant Likelyf7b3a832009-11-24 03:26:58 -0700565
Jeremy Kerr1406bc22010-01-30 01:31:21 -0700566 prop = of_get_flat_dt_prop(node, "linux,initrd-end", &len);
567 if (!prop)
568 return;
569 end = of_read_ulong(prop, len/4);
Grant Likelyf7b3a832009-11-24 03:26:58 -0700570
Jeremy Kerr1406bc22010-01-30 01:31:21 -0700571 early_init_dt_setup_initrd_arch(start, end);
572 pr_debug("initrd_start=0x%lx initrd_end=0x%lx\n", start, end);
Grant Likelyf7b3a832009-11-24 03:26:58 -0700573}
574#else
575inline void early_init_dt_check_for_initrd(unsigned long node)
576{
577}
578#endif /* CONFIG_BLK_DEV_INITRD */
579
Grant Likely41f88002009-11-23 20:07:01 -0700580/**
Grant Likelyf00abd92009-11-24 03:27:10 -0700581 * early_init_dt_scan_root - fetch the top level address and size cells
582 */
583int __init early_init_dt_scan_root(unsigned long node, const char *uname,
584 int depth, void *data)
585{
Jeremy Kerr33714882010-01-30 01:45:26 -0700586 __be32 *prop;
Grant Likelyf00abd92009-11-24 03:27:10 -0700587
588 if (depth != 0)
589 return 0;
590
Jeremy Kerr33714882010-01-30 01:45:26 -0700591 dt_root_size_cells = OF_ROOT_NODE_SIZE_CELLS_DEFAULT;
592 dt_root_addr_cells = OF_ROOT_NODE_ADDR_CELLS_DEFAULT;
593
Grant Likelyf00abd92009-11-24 03:27:10 -0700594 prop = of_get_flat_dt_prop(node, "#size-cells", NULL);
Jeremy Kerr33714882010-01-30 01:45:26 -0700595 if (prop)
596 dt_root_size_cells = be32_to_cpup(prop);
Grant Likelyf00abd92009-11-24 03:27:10 -0700597 pr_debug("dt_root_size_cells = %x\n", dt_root_size_cells);
598
599 prop = of_get_flat_dt_prop(node, "#address-cells", NULL);
Jeremy Kerr33714882010-01-30 01:45:26 -0700600 if (prop)
601 dt_root_addr_cells = be32_to_cpup(prop);
Grant Likelyf00abd92009-11-24 03:27:10 -0700602 pr_debug("dt_root_addr_cells = %x\n", dt_root_addr_cells);
603
604 /* break now */
605 return 1;
606}
607
Jeremy Kerr2e89e682010-01-30 01:41:49 -0700608u64 __init dt_mem_next_cell(int s, __be32 **cellp)
Grant Likely83f7a062009-11-24 03:37:56 -0700609{
Jeremy Kerr2e89e682010-01-30 01:41:49 -0700610 __be32 *p = *cellp;
Grant Likely83f7a062009-11-24 03:37:56 -0700611
612 *cellp = p + s;
613 return of_read_number(p, s);
614}
615
Grant Likely51975db2010-02-01 21:34:14 -0700616/**
617 * early_init_dt_scan_memory - Look for an parse memory nodes
618 */
619int __init early_init_dt_scan_memory(unsigned long node, const char *uname,
620 int depth, void *data)
621{
622 char *type = of_get_flat_dt_prop(node, "device_type", NULL);
623 __be32 *reg, *endp;
624 unsigned long l;
625
626 /* We are scanning "memory" nodes only */
627 if (type == NULL) {
628 /*
629 * The longtrail doesn't have a device_type on the
630 * /memory node, so look for the node called /memory@0.
631 */
632 if (depth != 1 || strcmp(uname, "memory@0") != 0)
633 return 0;
634 } else if (strcmp(type, "memory") != 0)
635 return 0;
636
637 reg = of_get_flat_dt_prop(node, "linux,usable-memory", &l);
638 if (reg == NULL)
639 reg = of_get_flat_dt_prop(node, "reg", &l);
640 if (reg == NULL)
641 return 0;
642
643 endp = reg + (l / sizeof(__be32));
644
645 pr_debug("memory scan node %s, reg size %ld, data: %x %x %x %x,\n",
646 uname, l, reg[0], reg[1], reg[2], reg[3]);
647
648 while ((endp - reg) >= (dt_root_addr_cells + dt_root_size_cells)) {
649 u64 base, size;
650
651 base = dt_mem_next_cell(dt_root_addr_cells, &reg);
652 size = dt_mem_next_cell(dt_root_size_cells, &reg);
653
654 if (size == 0)
655 continue;
656 pr_debug(" - %llx , %llx\n", (unsigned long long)base,
657 (unsigned long long)size);
658
659 early_init_dt_add_memory_arch(base, size);
660 }
661
662 return 0;
663}
664
Grant Likely86e03222009-12-10 23:42:21 -0700665int __init early_init_dt_scan_chosen(unsigned long node, const char *uname,
666 int depth, void *data)
667{
668 unsigned long l;
669 char *p;
670
671 pr_debug("search \"chosen\", depth: %d, uname: %s\n", depth, uname);
672
Grant Likely85f60ae2011-04-29 00:18:16 -0600673 if (depth != 1 || !data ||
Grant Likely86e03222009-12-10 23:42:21 -0700674 (strcmp(uname, "chosen") != 0 && strcmp(uname, "chosen@0") != 0))
675 return 0;
676
677 early_init_dt_check_for_initrd(node);
678
Lucas De Marchi25985ed2011-03-30 22:57:33 -0300679 /* Retrieve command line */
Grant Likely86e03222009-12-10 23:42:21 -0700680 p = of_get_flat_dt_prop(node, "bootargs", &l);
681 if (p != NULL && l > 0)
Grant Likely85f60ae2011-04-29 00:18:16 -0600682 strlcpy(data, p, min((int)l, COMMAND_LINE_SIZE));
Grant Likely86e03222009-12-10 23:42:21 -0700683
Benjamin Herrenschmidt78b782c2011-09-19 18:50:15 +0000684 /*
685 * CONFIG_CMDLINE is meant to be a default in case nothing else
686 * managed to set the command line, unless CONFIG_CMDLINE_FORCE
687 * is set in which case we override whatever was found earlier.
688 */
Grant Likely86e03222009-12-10 23:42:21 -0700689#ifdef CONFIG_CMDLINE
690#ifndef CONFIG_CMDLINE_FORCE
Benjamin Herrenschmidt78b782c2011-09-19 18:50:15 +0000691 if (!((char *)data)[0])
Grant Likely86e03222009-12-10 23:42:21 -0700692#endif
Grant Likely85f60ae2011-04-29 00:18:16 -0600693 strlcpy(data, CONFIG_CMDLINE, COMMAND_LINE_SIZE);
Grant Likely86e03222009-12-10 23:42:21 -0700694#endif /* CONFIG_CMDLINE */
695
Grant Likely85f60ae2011-04-29 00:18:16 -0600696 pr_debug("Command line is: %s\n", (char*)data);
Grant Likely86e03222009-12-10 23:42:21 -0700697
698 /* break now */
699 return 1;
700}
701
Grant Likelyf00abd92009-11-24 03:27:10 -0700702/**
Grant Likely41f88002009-11-23 20:07:01 -0700703 * unflatten_device_tree - create tree of device_nodes from flat blob
704 *
705 * unflattens the device-tree passed by the firmware, creating the
706 * tree of struct device_node. It also fills the "name" and "type"
707 * pointers of the nodes so the normal device-tree walking functions
708 * can be used.
709 */
710void __init unflatten_device_tree(void)
711{
Stephen Neuendorfferfe140422010-11-18 15:55:02 -0800712 __unflatten_device_tree(initial_boot_params, &allnodes,
Grant Likely672c5442011-01-13 15:36:09 -0700713 early_init_dt_alloc_memory_arch);
Grant Likely41f88002009-11-23 20:07:01 -0700714
Shawn Guo611cad72011-08-15 15:28:14 +0800715 /* Get pointer to "/chosen" and "/aliasas" nodes for use everywhere */
716 of_alias_scan(early_init_dt_alloc_memory_arch);
Grant Likely41f88002009-11-23 20:07:01 -0700717}
Stephen Neuendorffere6ce1322010-11-18 15:54:56 -0800718
719#endif /* CONFIG_OF_EARLY_FLATTREE */