xref: /openbmc/u-boot/common/fdt_support.c (revision b46694df)
1 /*
2  * (C) Copyright 2007
3  * Gerald Van Baren, Custom IDEAS, vanbaren@cideas.com
4  *
5  * Copyright 2010-2011 Freescale Semiconductor, Inc.
6  *
7  * See file CREDITS for list of people who contributed to this
8  * project.
9  *
10  * This program is free software; you can redistribute it and/or
11  * modify it under the terms of the GNU General Public License as
12  * published by the Free Software Foundation; either version 2 of
13  * the License, or (at your option) any later version.
14  *
15  * This program is distributed in the hope that it will be useful,
16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
18  * GNU General Public License for more details.
19  *
20  * You should have received a copy of the GNU General Public License
21  * along with this program; if not, write to the Free Software
22  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
23  * MA 02111-1307 USA
24  */
25 
26 #include <common.h>
27 #include <stdio_dev.h>
28 #include <linux/ctype.h>
29 #include <linux/types.h>
30 #include <asm/global_data.h>
31 #include <libfdt.h>
32 #include <fdt_support.h>
33 #include <exports.h>
34 
35 /*
36  * Global data (for the gd->bd)
37  */
38 DECLARE_GLOBAL_DATA_PTR;
39 
40 /**
41  * fdt_getprop_u32_default - Find a node and return it's property or a default
42  *
43  * @fdt: ptr to device tree
44  * @path: path of node
45  * @prop: property name
46  * @dflt: default value if the property isn't found
47  *
48  * Convenience function to find a node and return it's property or a
49  * default value if it doesn't exist.
50  */
51 u32 fdt_getprop_u32_default(const void *fdt, const char *path,
52 				const char *prop, const u32 dflt)
53 {
54 	const fdt32_t *val;
55 	int off;
56 
57 	off = fdt_path_offset(fdt, path);
58 	if (off < 0)
59 		return dflt;
60 
61 	val = fdt_getprop(fdt, off, prop, NULL);
62 	if (val)
63 		return fdt32_to_cpu(*val);
64 	else
65 		return dflt;
66 }
67 
68 /**
69  * fdt_find_and_setprop: Find a node and set it's property
70  *
71  * @fdt: ptr to device tree
72  * @node: path of node
73  * @prop: property name
74  * @val: ptr to new value
75  * @len: length of new property value
76  * @create: flag to create the property if it doesn't exist
77  *
78  * Convenience function to directly set a property given the path to the node.
79  */
80 int fdt_find_and_setprop(void *fdt, const char *node, const char *prop,
81 			 const void *val, int len, int create)
82 {
83 	int nodeoff = fdt_path_offset(fdt, node);
84 
85 	if (nodeoff < 0)
86 		return nodeoff;
87 
88 	if ((!create) && (fdt_get_property(fdt, nodeoff, prop, NULL) == NULL))
89 		return 0; /* create flag not set; so exit quietly */
90 
91 	return fdt_setprop(fdt, nodeoff, prop, val, len);
92 }
93 
94 #ifdef CONFIG_OF_STDOUT_VIA_ALIAS
95 
96 #ifdef CONFIG_CONS_INDEX
97 static void fdt_fill_multisername(char *sername, size_t maxlen)
98 {
99 	const char *outname = stdio_devices[stdout]->name;
100 
101 	if (strcmp(outname, "serial") > 0)
102 		strncpy(sername, outname, maxlen);
103 
104 	/* eserial? */
105 	if (strcmp(outname + 1, "serial") > 0)
106 		strncpy(sername, outname + 1, maxlen);
107 }
108 #endif
109 
110 static int fdt_fixup_stdout(void *fdt, int chosenoff)
111 {
112 	int err = 0;
113 #ifdef CONFIG_CONS_INDEX
114 	int node;
115 	char sername[9] = { 0 };
116 	const char *path;
117 
118 	fdt_fill_multisername(sername, sizeof(sername) - 1);
119 	if (!sername[0])
120 		sprintf(sername, "serial%d", CONFIG_CONS_INDEX - 1);
121 
122 	err = node = fdt_path_offset(fdt, "/aliases");
123 	if (node >= 0) {
124 		int len;
125 		path = fdt_getprop(fdt, node, sername, &len);
126 		if (path) {
127 			char *p = malloc(len);
128 			err = -FDT_ERR_NOSPACE;
129 			if (p) {
130 				memcpy(p, path, len);
131 				err = fdt_setprop(fdt, chosenoff,
132 					"linux,stdout-path", p, len);
133 				free(p);
134 			}
135 		} else {
136 			err = len;
137 		}
138 	}
139 #endif
140 	if (err < 0)
141 		printf("WARNING: could not set linux,stdout-path %s.\n",
142 				fdt_strerror(err));
143 
144 	return err;
145 }
146 #endif
147 
148 int fdt_initrd(void *fdt, ulong initrd_start, ulong initrd_end, int force)
149 {
150 	int   nodeoffset;
151 	int   err, j, total;
152 	fdt32_t  tmp;
153 	const char *path;
154 	uint64_t addr, size;
155 
156 	/* Find the "chosen" node.  */
157 	nodeoffset = fdt_path_offset (fdt, "/chosen");
158 
159 	/* If there is no "chosen" node in the blob return */
160 	if (nodeoffset < 0) {
161 		printf("fdt_initrd: %s\n", fdt_strerror(nodeoffset));
162 		return nodeoffset;
163 	}
164 
165 	/* just return if initrd_start/end aren't valid */
166 	if ((initrd_start == 0) || (initrd_end == 0))
167 		return 0;
168 
169 	total = fdt_num_mem_rsv(fdt);
170 
171 	/*
172 	 * Look for an existing entry and update it.  If we don't find
173 	 * the entry, we will j be the next available slot.
174 	 */
175 	for (j = 0; j < total; j++) {
176 		err = fdt_get_mem_rsv(fdt, j, &addr, &size);
177 		if (addr == initrd_start) {
178 			fdt_del_mem_rsv(fdt, j);
179 			break;
180 		}
181 	}
182 
183 	err = fdt_add_mem_rsv(fdt, initrd_start, initrd_end - initrd_start);
184 	if (err < 0) {
185 		printf("fdt_initrd: %s\n", fdt_strerror(err));
186 		return err;
187 	}
188 
189 	path = fdt_getprop(fdt, nodeoffset, "linux,initrd-start", NULL);
190 	if ((path == NULL) || force) {
191 		tmp = cpu_to_fdt32(initrd_start);
192 		err = fdt_setprop(fdt, nodeoffset,
193 			"linux,initrd-start", &tmp, sizeof(tmp));
194 		if (err < 0) {
195 			printf("WARNING: "
196 				"could not set linux,initrd-start %s.\n",
197 				fdt_strerror(err));
198 			return err;
199 		}
200 		tmp = cpu_to_fdt32(initrd_end);
201 		err = fdt_setprop(fdt, nodeoffset,
202 			"linux,initrd-end", &tmp, sizeof(tmp));
203 		if (err < 0) {
204 			printf("WARNING: could not set linux,initrd-end %s.\n",
205 				fdt_strerror(err));
206 
207 			return err;
208 		}
209 	}
210 
211 	return 0;
212 }
213 
214 int fdt_chosen(void *fdt, int force)
215 {
216 	int   nodeoffset;
217 	int   err;
218 	char  *str;		/* used to set string properties */
219 	const char *path;
220 
221 	err = fdt_check_header(fdt);
222 	if (err < 0) {
223 		printf("fdt_chosen: %s\n", fdt_strerror(err));
224 		return err;
225 	}
226 
227 	/*
228 	 * Find the "chosen" node.
229 	 */
230 	nodeoffset = fdt_path_offset (fdt, "/chosen");
231 
232 	/*
233 	 * If there is no "chosen" node in the blob, create it.
234 	 */
235 	if (nodeoffset < 0) {
236 		/*
237 		 * Create a new node "/chosen" (offset 0 is root level)
238 		 */
239 		nodeoffset = fdt_add_subnode(fdt, 0, "chosen");
240 		if (nodeoffset < 0) {
241 			printf("WARNING: could not create /chosen %s.\n",
242 				fdt_strerror(nodeoffset));
243 			return nodeoffset;
244 		}
245 	}
246 
247 	/*
248 	 * Create /chosen properites that don't exist in the fdt.
249 	 * If the property exists, update it only if the "force" parameter
250 	 * is true.
251 	 */
252 	str = getenv("bootargs");
253 	if (str != NULL) {
254 		path = fdt_getprop(fdt, nodeoffset, "bootargs", NULL);
255 		if ((path == NULL) || force) {
256 			err = fdt_setprop(fdt, nodeoffset,
257 				"bootargs", str, strlen(str)+1);
258 			if (err < 0)
259 				printf("WARNING: could not set bootargs %s.\n",
260 					fdt_strerror(err));
261 		}
262 	}
263 
264 #ifdef CONFIG_OF_STDOUT_VIA_ALIAS
265 	path = fdt_getprop(fdt, nodeoffset, "linux,stdout-path", NULL);
266 	if ((path == NULL) || force)
267 		err = fdt_fixup_stdout(fdt, nodeoffset);
268 #endif
269 
270 #ifdef OF_STDOUT_PATH
271 	path = fdt_getprop(fdt, nodeoffset, "linux,stdout-path", NULL);
272 	if ((path == NULL) || force) {
273 		err = fdt_setprop(fdt, nodeoffset,
274 			"linux,stdout-path", OF_STDOUT_PATH, strlen(OF_STDOUT_PATH)+1);
275 		if (err < 0)
276 			printf("WARNING: could not set linux,stdout-path %s.\n",
277 				fdt_strerror(err));
278 	}
279 #endif
280 
281 	return err;
282 }
283 
284 void do_fixup_by_path(void *fdt, const char *path, const char *prop,
285 		      const void *val, int len, int create)
286 {
287 #if defined(DEBUG)
288 	int i;
289 	debug("Updating property '%s/%s' = ", path, prop);
290 	for (i = 0; i < len; i++)
291 		debug(" %.2x", *(u8*)(val+i));
292 	debug("\n");
293 #endif
294 	int rc = fdt_find_and_setprop(fdt, path, prop, val, len, create);
295 	if (rc)
296 		printf("Unable to update property %s:%s, err=%s\n",
297 			path, prop, fdt_strerror(rc));
298 }
299 
300 void do_fixup_by_path_u32(void *fdt, const char *path, const char *prop,
301 			  u32 val, int create)
302 {
303 	fdt32_t tmp = cpu_to_fdt32(val);
304 	do_fixup_by_path(fdt, path, prop, &tmp, sizeof(tmp), create);
305 }
306 
307 void do_fixup_by_prop(void *fdt,
308 		      const char *pname, const void *pval, int plen,
309 		      const char *prop, const void *val, int len,
310 		      int create)
311 {
312 	int off;
313 #if defined(DEBUG)
314 	int i;
315 	debug("Updating property '%s' = ", prop);
316 	for (i = 0; i < len; i++)
317 		debug(" %.2x", *(u8*)(val+i));
318 	debug("\n");
319 #endif
320 	off = fdt_node_offset_by_prop_value(fdt, -1, pname, pval, plen);
321 	while (off != -FDT_ERR_NOTFOUND) {
322 		if (create || (fdt_get_property(fdt, off, prop, NULL) != NULL))
323 			fdt_setprop(fdt, off, prop, val, len);
324 		off = fdt_node_offset_by_prop_value(fdt, off, pname, pval, plen);
325 	}
326 }
327 
328 void do_fixup_by_prop_u32(void *fdt,
329 			  const char *pname, const void *pval, int plen,
330 			  const char *prop, u32 val, int create)
331 {
332 	fdt32_t tmp = cpu_to_fdt32(val);
333 	do_fixup_by_prop(fdt, pname, pval, plen, prop, &tmp, 4, create);
334 }
335 
336 void do_fixup_by_compat(void *fdt, const char *compat,
337 			const char *prop, const void *val, int len, int create)
338 {
339 	int off = -1;
340 #if defined(DEBUG)
341 	int i;
342 	debug("Updating property '%s' = ", prop);
343 	for (i = 0; i < len; i++)
344 		debug(" %.2x", *(u8*)(val+i));
345 	debug("\n");
346 #endif
347 	off = fdt_node_offset_by_compatible(fdt, -1, compat);
348 	while (off != -FDT_ERR_NOTFOUND) {
349 		if (create || (fdt_get_property(fdt, off, prop, NULL) != NULL))
350 			fdt_setprop(fdt, off, prop, val, len);
351 		off = fdt_node_offset_by_compatible(fdt, off, compat);
352 	}
353 }
354 
355 void do_fixup_by_compat_u32(void *fdt, const char *compat,
356 			    const char *prop, u32 val, int create)
357 {
358 	fdt32_t tmp = cpu_to_fdt32(val);
359 	do_fixup_by_compat(fdt, compat, prop, &tmp, 4, create);
360 }
361 
362 /*
363  * Get cells len in bytes
364  *     if #NNNN-cells property is 2 then len is 8
365  *     otherwise len is 4
366  */
367 static int get_cells_len(void *blob, char *nr_cells_name)
368 {
369 	const fdt32_t *cell;
370 
371 	cell = fdt_getprop(blob, 0, nr_cells_name, NULL);
372 	if (cell && fdt32_to_cpu(*cell) == 2)
373 		return 8;
374 
375 	return 4;
376 }
377 
378 /*
379  * Write a 4 or 8 byte big endian cell
380  */
381 static void write_cell(u8 *addr, u64 val, int size)
382 {
383 	int shift = (size - 1) * 8;
384 	while (size-- > 0) {
385 		*addr++ = (val >> shift) & 0xff;
386 		shift -= 8;
387 	}
388 }
389 
390 #ifdef CONFIG_NR_DRAM_BANKS
391 #define MEMORY_BANKS_MAX CONFIG_NR_DRAM_BANKS
392 #else
393 #define MEMORY_BANKS_MAX 4
394 #endif
395 int fdt_fixup_memory_banks(void *blob, u64 start[], u64 size[], int banks)
396 {
397 	int err, nodeoffset;
398 	int addr_cell_len, size_cell_len, len;
399 	u8 tmp[MEMORY_BANKS_MAX * 16]; /* Up to 64-bit address + 64-bit size */
400 	int bank;
401 
402 	if (banks > MEMORY_BANKS_MAX) {
403 		printf("%s: num banks %d exceeds hardcoded limit %d."
404 		       " Recompile with higher MEMORY_BANKS_MAX?\n",
405 		       __FUNCTION__, banks, MEMORY_BANKS_MAX);
406 		return -1;
407 	}
408 
409 	err = fdt_check_header(blob);
410 	if (err < 0) {
411 		printf("%s: %s\n", __FUNCTION__, fdt_strerror(err));
412 		return err;
413 	}
414 
415 	/* update, or add and update /memory node */
416 	nodeoffset = fdt_path_offset(blob, "/memory");
417 	if (nodeoffset < 0) {
418 		nodeoffset = fdt_add_subnode(blob, 0, "memory");
419 		if (nodeoffset < 0)
420 			printf("WARNING: could not create /memory: %s.\n",
421 					fdt_strerror(nodeoffset));
422 		return nodeoffset;
423 	}
424 	err = fdt_setprop(blob, nodeoffset, "device_type", "memory",
425 			sizeof("memory"));
426 	if (err < 0) {
427 		printf("WARNING: could not set %s %s.\n", "device_type",
428 				fdt_strerror(err));
429 		return err;
430 	}
431 
432 	addr_cell_len = get_cells_len(blob, "#address-cells");
433 	size_cell_len = get_cells_len(blob, "#size-cells");
434 
435 	for (bank = 0, len = 0; bank < banks; bank++) {
436 		write_cell(tmp + len, start[bank], addr_cell_len);
437 		len += addr_cell_len;
438 
439 		write_cell(tmp + len, size[bank], size_cell_len);
440 		len += size_cell_len;
441 	}
442 
443 	err = fdt_setprop(blob, nodeoffset, "reg", tmp, len);
444 	if (err < 0) {
445 		printf("WARNING: could not set %s %s.\n",
446 				"reg", fdt_strerror(err));
447 		return err;
448 	}
449 	return 0;
450 }
451 
452 int fdt_fixup_memory(void *blob, u64 start, u64 size)
453 {
454 	return fdt_fixup_memory_banks(blob, &start, &size, 1);
455 }
456 
457 void fdt_fixup_ethernet(void *fdt)
458 {
459 	int node, i, j;
460 	char enet[16], *tmp, *end;
461 	char mac[16] = "ethaddr";
462 	const char *path;
463 	unsigned char mac_addr[6];
464 
465 	node = fdt_path_offset(fdt, "/aliases");
466 	if (node < 0)
467 		return;
468 
469 	i = 0;
470 	while ((tmp = getenv(mac)) != NULL) {
471 		sprintf(enet, "ethernet%d", i);
472 		path = fdt_getprop(fdt, node, enet, NULL);
473 		if (!path) {
474 			debug("No alias for %s\n", enet);
475 			sprintf(mac, "eth%daddr", ++i);
476 			continue;
477 		}
478 
479 		for (j = 0; j < 6; j++) {
480 			mac_addr[j] = tmp ? simple_strtoul(tmp, &end, 16) : 0;
481 			if (tmp)
482 				tmp = (*end) ? end+1 : end;
483 		}
484 
485 		do_fixup_by_path(fdt, path, "mac-address", &mac_addr, 6, 0);
486 		do_fixup_by_path(fdt, path, "local-mac-address",
487 				&mac_addr, 6, 1);
488 
489 		sprintf(mac, "eth%daddr", ++i);
490 	}
491 }
492 
493 /* Resize the fdt to its actual size + a bit of padding */
494 int fdt_resize(void *blob)
495 {
496 	int i;
497 	uint64_t addr, size;
498 	int total, ret;
499 	uint actualsize;
500 
501 	if (!blob)
502 		return 0;
503 
504 	total = fdt_num_mem_rsv(blob);
505 	for (i = 0; i < total; i++) {
506 		fdt_get_mem_rsv(blob, i, &addr, &size);
507 		if (addr == (uintptr_t)blob) {
508 			fdt_del_mem_rsv(blob, i);
509 			break;
510 		}
511 	}
512 
513 	/*
514 	 * Calculate the actual size of the fdt
515 	 * plus the size needed for 5 fdt_add_mem_rsv, one
516 	 * for the fdt itself and 4 for a possible initrd
517 	 * ((initrd-start + initrd-end) * 2 (name & value))
518 	 */
519 	actualsize = fdt_off_dt_strings(blob) +
520 		fdt_size_dt_strings(blob) + 5 * sizeof(struct fdt_reserve_entry);
521 
522 	/* Make it so the fdt ends on a page boundary */
523 	actualsize = ALIGN(actualsize + ((uintptr_t)blob & 0xfff), 0x1000);
524 	actualsize = actualsize - ((uintptr_t)blob & 0xfff);
525 
526 	/* Change the fdt header to reflect the correct size */
527 	fdt_set_totalsize(blob, actualsize);
528 
529 	/* Add the new reservation */
530 	ret = fdt_add_mem_rsv(blob, (uintptr_t)blob, actualsize);
531 	if (ret < 0)
532 		return ret;
533 
534 	return actualsize;
535 }
536 
537 #ifdef CONFIG_PCI
538 #define CONFIG_SYS_PCI_NR_INBOUND_WIN 4
539 
540 #define FDT_PCI_PREFETCH	(0x40000000)
541 #define FDT_PCI_MEM32		(0x02000000)
542 #define FDT_PCI_IO		(0x01000000)
543 #define FDT_PCI_MEM64		(0x03000000)
544 
545 int fdt_pci_dma_ranges(void *blob, int phb_off, struct pci_controller *hose) {
546 
547 	int addrcell, sizecell, len, r;
548 	u32 *dma_range;
549 	/* sized based on pci addr cells, size-cells, & address-cells */
550 	u32 dma_ranges[(3 + 2 + 2) * CONFIG_SYS_PCI_NR_INBOUND_WIN];
551 
552 	addrcell = fdt_getprop_u32_default(blob, "/", "#address-cells", 1);
553 	sizecell = fdt_getprop_u32_default(blob, "/", "#size-cells", 1);
554 
555 	dma_range = &dma_ranges[0];
556 	for (r = 0; r < hose->region_count; r++) {
557 		u64 bus_start, phys_start, size;
558 
559 		/* skip if !PCI_REGION_SYS_MEMORY */
560 		if (!(hose->regions[r].flags & PCI_REGION_SYS_MEMORY))
561 			continue;
562 
563 		bus_start = (u64)hose->regions[r].bus_start;
564 		phys_start = (u64)hose->regions[r].phys_start;
565 		size = (u64)hose->regions[r].size;
566 
567 		dma_range[0] = 0;
568 		if (size >= 0x100000000ull)
569 			dma_range[0] |= FDT_PCI_MEM64;
570 		else
571 			dma_range[0] |= FDT_PCI_MEM32;
572 		if (hose->regions[r].flags & PCI_REGION_PREFETCH)
573 			dma_range[0] |= FDT_PCI_PREFETCH;
574 #ifdef CONFIG_SYS_PCI_64BIT
575 		dma_range[1] = bus_start >> 32;
576 #else
577 		dma_range[1] = 0;
578 #endif
579 		dma_range[2] = bus_start & 0xffffffff;
580 
581 		if (addrcell == 2) {
582 			dma_range[3] = phys_start >> 32;
583 			dma_range[4] = phys_start & 0xffffffff;
584 		} else {
585 			dma_range[3] = phys_start & 0xffffffff;
586 		}
587 
588 		if (sizecell == 2) {
589 			dma_range[3 + addrcell + 0] = size >> 32;
590 			dma_range[3 + addrcell + 1] = size & 0xffffffff;
591 		} else {
592 			dma_range[3 + addrcell + 0] = size & 0xffffffff;
593 		}
594 
595 		dma_range += (3 + addrcell + sizecell);
596 	}
597 
598 	len = dma_range - &dma_ranges[0];
599 	if (len)
600 		fdt_setprop(blob, phb_off, "dma-ranges", &dma_ranges[0], len*4);
601 
602 	return 0;
603 }
604 #endif
605 
606 #ifdef CONFIG_FDT_FIXUP_NOR_FLASH_SIZE
607 /*
608  * Provide a weak default function to return the flash bank size.
609  * There might be multiple non-identical flash chips connected to one
610  * chip-select, so we need to pass an index as well.
611  */
612 u32 __flash_get_bank_size(int cs, int idx)
613 {
614 	extern flash_info_t flash_info[];
615 
616 	/*
617 	 * As default, a simple 1:1 mapping is provided. Boards with
618 	 * a different mapping need to supply a board specific mapping
619 	 * routine.
620 	 */
621 	return flash_info[cs].size;
622 }
623 u32 flash_get_bank_size(int cs, int idx)
624 	__attribute__((weak, alias("__flash_get_bank_size")));
625 
626 /*
627  * This function can be used to update the size in the "reg" property
628  * of all NOR FLASH device nodes. This is necessary for boards with
629  * non-fixed NOR FLASH sizes.
630  */
631 int fdt_fixup_nor_flash_size(void *blob)
632 {
633 	char compat[][16] = { "cfi-flash", "jedec-flash" };
634 	int off;
635 	int len;
636 	struct fdt_property *prop;
637 	u32 *reg, *reg2;
638 	int i;
639 
640 	for (i = 0; i < 2; i++) {
641 		off = fdt_node_offset_by_compatible(blob, -1, compat[i]);
642 		while (off != -FDT_ERR_NOTFOUND) {
643 			int idx;
644 
645 			/*
646 			 * Found one compatible node, so fixup the size
647 			 * int its reg properties
648 			 */
649 			prop = fdt_get_property_w(blob, off, "reg", &len);
650 			if (prop) {
651 				int tuple_size = 3 * sizeof(reg);
652 
653 				/*
654 				 * There might be multiple reg-tuples,
655 				 * so loop through them all
656 				 */
657 				reg = reg2 = (u32 *)&prop->data[0];
658 				for (idx = 0; idx < (len / tuple_size); idx++) {
659 					/*
660 					 * Update size in reg property
661 					 */
662 					reg[2] = flash_get_bank_size(reg[0],
663 								     idx);
664 
665 					/*
666 					 * Point to next reg tuple
667 					 */
668 					reg += 3;
669 				}
670 
671 				fdt_setprop(blob, off, "reg", reg2, len);
672 			}
673 
674 			/* Move to next compatible node */
675 			off = fdt_node_offset_by_compatible(blob, off,
676 							    compat[i]);
677 		}
678 	}
679 
680 	return 0;
681 }
682 #endif
683 
684 int fdt_increase_size(void *fdt, int add_len)
685 {
686 	int newlen;
687 
688 	newlen = fdt_totalsize(fdt) + add_len;
689 
690 	/* Open in place with a new len */
691 	return fdt_open_into(fdt, fdt, newlen);
692 }
693 
694 #ifdef CONFIG_FDT_FIXUP_PARTITIONS
695 #include <jffs2/load_kernel.h>
696 #include <mtd_node.h>
697 
698 struct reg_cell {
699 	unsigned int r0;
700 	unsigned int r1;
701 };
702 
703 int fdt_del_subnodes(const void *blob, int parent_offset)
704 {
705 	int off, ndepth;
706 	int ret;
707 
708 	for (ndepth = 0, off = fdt_next_node(blob, parent_offset, &ndepth);
709 	     (off >= 0) && (ndepth > 0);
710 	     off = fdt_next_node(blob, off, &ndepth)) {
711 		if (ndepth == 1) {
712 			debug("delete %s: offset: %x\n",
713 				fdt_get_name(blob, off, 0), off);
714 			ret = fdt_del_node((void *)blob, off);
715 			if (ret < 0) {
716 				printf("Can't delete node: %s\n",
717 					fdt_strerror(ret));
718 				return ret;
719 			} else {
720 				ndepth = 0;
721 				off = parent_offset;
722 			}
723 		}
724 	}
725 	return 0;
726 }
727 
728 int fdt_del_partitions(void *blob, int parent_offset)
729 {
730 	const void *prop;
731 	int ndepth = 0;
732 	int off;
733 	int ret;
734 
735 	off = fdt_next_node(blob, parent_offset, &ndepth);
736 	if (off > 0 && ndepth == 1) {
737 		prop = fdt_getprop(blob, off, "label", NULL);
738 		if (prop == NULL) {
739 			/*
740 			 * Could not find label property, nand {}; node?
741 			 * Check subnode, delete partitions there if any.
742 			 */
743 			return fdt_del_partitions(blob, off);
744 		} else {
745 			ret = fdt_del_subnodes(blob, parent_offset);
746 			if (ret < 0) {
747 				printf("Can't remove subnodes: %s\n",
748 					fdt_strerror(ret));
749 				return ret;
750 			}
751 		}
752 	}
753 	return 0;
754 }
755 
756 int fdt_node_set_part_info(void *blob, int parent_offset,
757 			   struct mtd_device *dev)
758 {
759 	struct list_head *pentry;
760 	struct part_info *part;
761 	struct reg_cell cell;
762 	int off, ndepth = 0;
763 	int part_num, ret;
764 	char buf[64];
765 
766 	ret = fdt_del_partitions(blob, parent_offset);
767 	if (ret < 0)
768 		return ret;
769 
770 	/*
771 	 * Check if it is nand {}; subnode, adjust
772 	 * the offset in this case
773 	 */
774 	off = fdt_next_node(blob, parent_offset, &ndepth);
775 	if (off > 0 && ndepth == 1)
776 		parent_offset = off;
777 
778 	part_num = 0;
779 	list_for_each_prev(pentry, &dev->parts) {
780 		int newoff;
781 
782 		part = list_entry(pentry, struct part_info, link);
783 
784 		debug("%2d: %-20s0x%08x\t0x%08x\t%d\n",
785 			part_num, part->name, part->size,
786 			part->offset, part->mask_flags);
787 
788 		sprintf(buf, "partition@%x", part->offset);
789 add_sub:
790 		ret = fdt_add_subnode(blob, parent_offset, buf);
791 		if (ret == -FDT_ERR_NOSPACE) {
792 			ret = fdt_increase_size(blob, 512);
793 			if (!ret)
794 				goto add_sub;
795 			else
796 				goto err_size;
797 		} else if (ret < 0) {
798 			printf("Can't add partition node: %s\n",
799 				fdt_strerror(ret));
800 			return ret;
801 		}
802 		newoff = ret;
803 
804 		/* Check MTD_WRITEABLE_CMD flag */
805 		if (part->mask_flags & 1) {
806 add_ro:
807 			ret = fdt_setprop(blob, newoff, "read_only", NULL, 0);
808 			if (ret == -FDT_ERR_NOSPACE) {
809 				ret = fdt_increase_size(blob, 512);
810 				if (!ret)
811 					goto add_ro;
812 				else
813 					goto err_size;
814 			} else if (ret < 0)
815 				goto err_prop;
816 		}
817 
818 		cell.r0 = cpu_to_fdt32(part->offset);
819 		cell.r1 = cpu_to_fdt32(part->size);
820 add_reg:
821 		ret = fdt_setprop(blob, newoff, "reg", &cell, sizeof(cell));
822 		if (ret == -FDT_ERR_NOSPACE) {
823 			ret = fdt_increase_size(blob, 512);
824 			if (!ret)
825 				goto add_reg;
826 			else
827 				goto err_size;
828 		} else if (ret < 0)
829 			goto err_prop;
830 
831 add_label:
832 		ret = fdt_setprop_string(blob, newoff, "label", part->name);
833 		if (ret == -FDT_ERR_NOSPACE) {
834 			ret = fdt_increase_size(blob, 512);
835 			if (!ret)
836 				goto add_label;
837 			else
838 				goto err_size;
839 		} else if (ret < 0)
840 			goto err_prop;
841 
842 		part_num++;
843 	}
844 	return 0;
845 err_size:
846 	printf("Can't increase blob size: %s\n", fdt_strerror(ret));
847 	return ret;
848 err_prop:
849 	printf("Can't add property: %s\n", fdt_strerror(ret));
850 	return ret;
851 }
852 
853 /*
854  * Update partitions in nor/nand nodes using info from
855  * mtdparts environment variable. The nodes to update are
856  * specified by node_info structure which contains mtd device
857  * type and compatible string: E. g. the board code in
858  * ft_board_setup() could use:
859  *
860  *	struct node_info nodes[] = {
861  *		{ "fsl,mpc5121-nfc",    MTD_DEV_TYPE_NAND, },
862  *		{ "cfi-flash",          MTD_DEV_TYPE_NOR,  },
863  *	};
864  *
865  *	fdt_fixup_mtdparts(blob, nodes, ARRAY_SIZE(nodes));
866  */
867 void fdt_fixup_mtdparts(void *blob, void *node_info, int node_info_size)
868 {
869 	struct node_info *ni = node_info;
870 	struct mtd_device *dev;
871 	char *parts;
872 	int i, idx;
873 	int noff;
874 
875 	parts = getenv("mtdparts");
876 	if (!parts)
877 		return;
878 
879 	if (mtdparts_init() != 0)
880 		return;
881 
882 	for (i = 0; i < node_info_size; i++) {
883 		idx = 0;
884 		noff = fdt_node_offset_by_compatible(blob, -1, ni[i].compat);
885 		while (noff != -FDT_ERR_NOTFOUND) {
886 			debug("%s: %s, mtd dev type %d\n",
887 				fdt_get_name(blob, noff, 0),
888 				ni[i].compat, ni[i].type);
889 			dev = device_find(ni[i].type, idx++);
890 			if (dev) {
891 				if (fdt_node_set_part_info(blob, noff, dev))
892 					return; /* return on error */
893 			}
894 
895 			/* Jump to next flash node */
896 			noff = fdt_node_offset_by_compatible(blob, noff,
897 							     ni[i].compat);
898 		}
899 	}
900 }
901 #endif
902 
903 void fdt_del_node_and_alias(void *blob, const char *alias)
904 {
905 	int off = fdt_path_offset(blob, alias);
906 
907 	if (off < 0)
908 		return;
909 
910 	fdt_del_node(blob, off);
911 
912 	off = fdt_path_offset(blob, "/aliases");
913 	fdt_delprop(blob, off, alias);
914 }
915 
916 /* Helper to read a big number; size is in cells (not bytes) */
917 static inline u64 of_read_number(const fdt32_t *cell, int size)
918 {
919 	u64 r = 0;
920 	while (size--)
921 		r = (r << 32) | fdt32_to_cpu(*(cell++));
922 	return r;
923 }
924 
925 #define PRu64	"%llx"
926 
927 /* Max address size we deal with */
928 #define OF_MAX_ADDR_CELLS	4
929 #define OF_BAD_ADDR	((u64)-1)
930 #define OF_CHECK_COUNTS(na, ns)	((na) > 0 && (na) <= OF_MAX_ADDR_CELLS && \
931 			(ns) > 0)
932 
933 /* Debug utility */
934 #ifdef DEBUG
935 static void of_dump_addr(const char *s, const fdt32_t *addr, int na)
936 {
937 	printf("%s", s);
938 	while(na--)
939 		printf(" %08x", *(addr++));
940 	printf("\n");
941 }
942 #else
943 static void of_dump_addr(const char *s, const fdt32_t *addr, int na) { }
944 #endif
945 
946 /* Callbacks for bus specific translators */
947 struct of_bus {
948 	const char	*name;
949 	const char	*addresses;
950 	void		(*count_cells)(void *blob, int parentoffset,
951 				int *addrc, int *sizec);
952 	u64		(*map)(fdt32_t *addr, const fdt32_t *range,
953 				int na, int ns, int pna);
954 	int		(*translate)(fdt32_t *addr, u64 offset, int na);
955 };
956 
957 /* Default translator (generic bus) */
958 static void of_bus_default_count_cells(void *blob, int parentoffset,
959 					int *addrc, int *sizec)
960 {
961 	const fdt32_t *prop;
962 
963 	if (addrc) {
964 		prop = fdt_getprop(blob, parentoffset, "#address-cells", NULL);
965 		if (prop)
966 			*addrc = be32_to_cpup(prop);
967 		else
968 			*addrc = 2;
969 	}
970 
971 	if (sizec) {
972 		prop = fdt_getprop(blob, parentoffset, "#size-cells", NULL);
973 		if (prop)
974 			*sizec = be32_to_cpup(prop);
975 		else
976 			*sizec = 1;
977 	}
978 }
979 
980 static u64 of_bus_default_map(fdt32_t *addr, const fdt32_t *range,
981 		int na, int ns, int pna)
982 {
983 	u64 cp, s, da;
984 
985 	cp = of_read_number(range, na);
986 	s  = of_read_number(range + na + pna, ns);
987 	da = of_read_number(addr, na);
988 
989 	debug("OF: default map, cp="PRu64", s="PRu64", da="PRu64"\n",
990 	    cp, s, da);
991 
992 	if (da < cp || da >= (cp + s))
993 		return OF_BAD_ADDR;
994 	return da - cp;
995 }
996 
997 static int of_bus_default_translate(fdt32_t *addr, u64 offset, int na)
998 {
999 	u64 a = of_read_number(addr, na);
1000 	memset(addr, 0, na * 4);
1001 	a += offset;
1002 	if (na > 1)
1003 		addr[na - 2] = cpu_to_fdt32(a >> 32);
1004 	addr[na - 1] = cpu_to_fdt32(a & 0xffffffffu);
1005 
1006 	return 0;
1007 }
1008 
1009 /* Array of bus specific translators */
1010 static struct of_bus of_busses[] = {
1011 	/* Default */
1012 	{
1013 		.name = "default",
1014 		.addresses = "reg",
1015 		.count_cells = of_bus_default_count_cells,
1016 		.map = of_bus_default_map,
1017 		.translate = of_bus_default_translate,
1018 	},
1019 };
1020 
1021 static int of_translate_one(void * blob, int parent, struct of_bus *bus,
1022 			    struct of_bus *pbus, fdt32_t *addr,
1023 			    int na, int ns, int pna, const char *rprop)
1024 {
1025 	const fdt32_t *ranges;
1026 	int rlen;
1027 	int rone;
1028 	u64 offset = OF_BAD_ADDR;
1029 
1030 	/* Normally, an absence of a "ranges" property means we are
1031 	 * crossing a non-translatable boundary, and thus the addresses
1032 	 * below the current not cannot be converted to CPU physical ones.
1033 	 * Unfortunately, while this is very clear in the spec, it's not
1034 	 * what Apple understood, and they do have things like /uni-n or
1035 	 * /ht nodes with no "ranges" property and a lot of perfectly
1036 	 * useable mapped devices below them. Thus we treat the absence of
1037 	 * "ranges" as equivalent to an empty "ranges" property which means
1038 	 * a 1:1 translation at that level. It's up to the caller not to try
1039 	 * to translate addresses that aren't supposed to be translated in
1040 	 * the first place. --BenH.
1041 	 */
1042 	ranges = fdt_getprop(blob, parent, rprop, &rlen);
1043 	if (ranges == NULL || rlen == 0) {
1044 		offset = of_read_number(addr, na);
1045 		memset(addr, 0, pna * 4);
1046 		debug("OF: no ranges, 1:1 translation\n");
1047 		goto finish;
1048 	}
1049 
1050 	debug("OF: walking ranges...\n");
1051 
1052 	/* Now walk through the ranges */
1053 	rlen /= 4;
1054 	rone = na + pna + ns;
1055 	for (; rlen >= rone; rlen -= rone, ranges += rone) {
1056 		offset = bus->map(addr, ranges, na, ns, pna);
1057 		if (offset != OF_BAD_ADDR)
1058 			break;
1059 	}
1060 	if (offset == OF_BAD_ADDR) {
1061 		debug("OF: not found !\n");
1062 		return 1;
1063 	}
1064 	memcpy(addr, ranges + na, 4 * pna);
1065 
1066  finish:
1067 	of_dump_addr("OF: parent translation for:", addr, pna);
1068 	debug("OF: with offset: "PRu64"\n", offset);
1069 
1070 	/* Translate it into parent bus space */
1071 	return pbus->translate(addr, offset, pna);
1072 }
1073 
1074 /*
1075  * Translate an address from the device-tree into a CPU physical address,
1076  * this walks up the tree and applies the various bus mappings on the
1077  * way.
1078  *
1079  * Note: We consider that crossing any level with #size-cells == 0 to mean
1080  * that translation is impossible (that is we are not dealing with a value
1081  * that can be mapped to a cpu physical address). This is not really specified
1082  * that way, but this is traditionally the way IBM at least do things
1083  */
1084 static u64 __of_translate_address(void *blob, int node_offset, const fdt32_t *in_addr,
1085 				  const char *rprop)
1086 {
1087 	int parent;
1088 	struct of_bus *bus, *pbus;
1089 	fdt32_t addr[OF_MAX_ADDR_CELLS];
1090 	int na, ns, pna, pns;
1091 	u64 result = OF_BAD_ADDR;
1092 
1093 	debug("OF: ** translation for device %s **\n",
1094 		fdt_get_name(blob, node_offset, NULL));
1095 
1096 	/* Get parent & match bus type */
1097 	parent = fdt_parent_offset(blob, node_offset);
1098 	if (parent < 0)
1099 		goto bail;
1100 	bus = &of_busses[0];
1101 
1102 	/* Cound address cells & copy address locally */
1103 	bus->count_cells(blob, parent, &na, &ns);
1104 	if (!OF_CHECK_COUNTS(na, ns)) {
1105 		printf("%s: Bad cell count for %s\n", __FUNCTION__,
1106 		       fdt_get_name(blob, node_offset, NULL));
1107 		goto bail;
1108 	}
1109 	memcpy(addr, in_addr, na * 4);
1110 
1111 	debug("OF: bus is %s (na=%d, ns=%d) on %s\n",
1112 	    bus->name, na, ns, fdt_get_name(blob, parent, NULL));
1113 	of_dump_addr("OF: translating address:", addr, na);
1114 
1115 	/* Translate */
1116 	for (;;) {
1117 		/* Switch to parent bus */
1118 		node_offset = parent;
1119 		parent = fdt_parent_offset(blob, node_offset);
1120 
1121 		/* If root, we have finished */
1122 		if (parent < 0) {
1123 			debug("OF: reached root node\n");
1124 			result = of_read_number(addr, na);
1125 			break;
1126 		}
1127 
1128 		/* Get new parent bus and counts */
1129 		pbus = &of_busses[0];
1130 		pbus->count_cells(blob, parent, &pna, &pns);
1131 		if (!OF_CHECK_COUNTS(pna, pns)) {
1132 			printf("%s: Bad cell count for %s\n", __FUNCTION__,
1133 				fdt_get_name(blob, node_offset, NULL));
1134 			break;
1135 		}
1136 
1137 		debug("OF: parent bus is %s (na=%d, ns=%d) on %s\n",
1138 		    pbus->name, pna, pns, fdt_get_name(blob, parent, NULL));
1139 
1140 		/* Apply bus translation */
1141 		if (of_translate_one(blob, node_offset, bus, pbus,
1142 					addr, na, ns, pna, rprop))
1143 			break;
1144 
1145 		/* Complete the move up one level */
1146 		na = pna;
1147 		ns = pns;
1148 		bus = pbus;
1149 
1150 		of_dump_addr("OF: one level translation:", addr, na);
1151 	}
1152  bail:
1153 
1154 	return result;
1155 }
1156 
1157 u64 fdt_translate_address(void *blob, int node_offset, const fdt32_t *in_addr)
1158 {
1159 	return __of_translate_address(blob, node_offset, in_addr, "ranges");
1160 }
1161 
1162 /**
1163  * fdt_node_offset_by_compat_reg: Find a node that matches compatiable and
1164  * who's reg property matches a physical cpu address
1165  *
1166  * @blob: ptr to device tree
1167  * @compat: compatiable string to match
1168  * @compat_off: property name
1169  *
1170  */
1171 int fdt_node_offset_by_compat_reg(void *blob, const char *compat,
1172 					phys_addr_t compat_off)
1173 {
1174 	int len, off = fdt_node_offset_by_compatible(blob, -1, compat);
1175 	while (off != -FDT_ERR_NOTFOUND) {
1176 		const fdt32_t *reg = fdt_getprop(blob, off, "reg", &len);
1177 		if (reg) {
1178 			if (compat_off == fdt_translate_address(blob, off, reg))
1179 				return off;
1180 		}
1181 		off = fdt_node_offset_by_compatible(blob, off, compat);
1182 	}
1183 
1184 	return -FDT_ERR_NOTFOUND;
1185 }
1186 
1187 /**
1188  * fdt_alloc_phandle: Return next free phandle value
1189  *
1190  * @blob: ptr to device tree
1191  */
1192 int fdt_alloc_phandle(void *blob)
1193 {
1194 	int offset, phandle = 0;
1195 
1196 	for (offset = fdt_next_node(blob, -1, NULL); offset >= 0;
1197 	     offset = fdt_next_node(blob, offset, NULL)) {
1198 		phandle = max(phandle, fdt_get_phandle(blob, offset));
1199 	}
1200 
1201 	return phandle + 1;
1202 }
1203 
1204 /*
1205  * fdt_set_phandle: Create a phandle property for the given node
1206  *
1207  * @fdt: ptr to device tree
1208  * @nodeoffset: node to update
1209  * @phandle: phandle value to set (must be unique)
1210  */
1211 int fdt_set_phandle(void *fdt, int nodeoffset, uint32_t phandle)
1212 {
1213 	int ret;
1214 
1215 #ifdef DEBUG
1216 	int off = fdt_node_offset_by_phandle(fdt, phandle);
1217 
1218 	if ((off >= 0) && (off != nodeoffset)) {
1219 		char buf[64];
1220 
1221 		fdt_get_path(fdt, nodeoffset, buf, sizeof(buf));
1222 		printf("Trying to update node %s with phandle %u ",
1223 		       buf, phandle);
1224 
1225 		fdt_get_path(fdt, off, buf, sizeof(buf));
1226 		printf("that already exists in node %s.\n", buf);
1227 		return -FDT_ERR_BADPHANDLE;
1228 	}
1229 #endif
1230 
1231 	ret = fdt_setprop_cell(fdt, nodeoffset, "phandle", phandle);
1232 	if (ret < 0)
1233 		return ret;
1234 
1235 	/*
1236 	 * For now, also set the deprecated "linux,phandle" property, so that we
1237 	 * don't break older kernels.
1238 	 */
1239 	ret = fdt_setprop_cell(fdt, nodeoffset, "linux,phandle", phandle);
1240 
1241 	return ret;
1242 }
1243 
1244 /*
1245  * fdt_create_phandle: Create a phandle property for the given node
1246  *
1247  * @fdt: ptr to device tree
1248  * @nodeoffset: node to update
1249  */
1250 unsigned int fdt_create_phandle(void *fdt, int nodeoffset)
1251 {
1252 	/* see if there is a phandle already */
1253 	int phandle = fdt_get_phandle(fdt, nodeoffset);
1254 
1255 	/* if we got 0, means no phandle so create one */
1256 	if (phandle == 0) {
1257 		int ret;
1258 
1259 		phandle = fdt_alloc_phandle(fdt);
1260 		ret = fdt_set_phandle(fdt, nodeoffset, phandle);
1261 		if (ret < 0) {
1262 			printf("Can't set phandle %u: %s\n", phandle,
1263 			       fdt_strerror(ret));
1264 			return 0;
1265 		}
1266 	}
1267 
1268 	return phandle;
1269 }
1270 
1271 /*
1272  * fdt_set_node_status: Set status for the given node
1273  *
1274  * @fdt: ptr to device tree
1275  * @nodeoffset: node to update
1276  * @status: FDT_STATUS_OKAY, FDT_STATUS_DISABLED,
1277  *	    FDT_STATUS_FAIL, FDT_STATUS_FAIL_ERROR_CODE
1278  * @error_code: optional, only used if status is FDT_STATUS_FAIL_ERROR_CODE
1279  */
1280 int fdt_set_node_status(void *fdt, int nodeoffset,
1281 			enum fdt_status status, unsigned int error_code)
1282 {
1283 	char buf[16];
1284 	int ret = 0;
1285 
1286 	if (nodeoffset < 0)
1287 		return nodeoffset;
1288 
1289 	switch (status) {
1290 	case FDT_STATUS_OKAY:
1291 		ret = fdt_setprop_string(fdt, nodeoffset, "status", "okay");
1292 		break;
1293 	case FDT_STATUS_DISABLED:
1294 		ret = fdt_setprop_string(fdt, nodeoffset, "status", "disabled");
1295 		break;
1296 	case FDT_STATUS_FAIL:
1297 		ret = fdt_setprop_string(fdt, nodeoffset, "status", "fail");
1298 		break;
1299 	case FDT_STATUS_FAIL_ERROR_CODE:
1300 		sprintf(buf, "fail-%d", error_code);
1301 		ret = fdt_setprop_string(fdt, nodeoffset, "status", buf);
1302 		break;
1303 	default:
1304 		printf("Invalid fdt status: %x\n", status);
1305 		ret = -1;
1306 		break;
1307 	}
1308 
1309 	return ret;
1310 }
1311 
1312 /*
1313  * fdt_set_status_by_alias: Set status for the given node given an alias
1314  *
1315  * @fdt: ptr to device tree
1316  * @alias: alias of node to update
1317  * @status: FDT_STATUS_OKAY, FDT_STATUS_DISABLED,
1318  *	    FDT_STATUS_FAIL, FDT_STATUS_FAIL_ERROR_CODE
1319  * @error_code: optional, only used if status is FDT_STATUS_FAIL_ERROR_CODE
1320  */
1321 int fdt_set_status_by_alias(void *fdt, const char* alias,
1322 			    enum fdt_status status, unsigned int error_code)
1323 {
1324 	int offset = fdt_path_offset(fdt, alias);
1325 
1326 	return fdt_set_node_status(fdt, offset, status, error_code);
1327 }
1328 
1329 #if defined(CONFIG_VIDEO) || defined(CONFIG_LCD)
1330 int fdt_add_edid(void *blob, const char *compat, unsigned char *edid_buf)
1331 {
1332 	int noff;
1333 	int ret;
1334 
1335 	noff = fdt_node_offset_by_compatible(blob, -1, compat);
1336 	if (noff != -FDT_ERR_NOTFOUND) {
1337 		debug("%s: %s\n", fdt_get_name(blob, noff, 0), compat);
1338 add_edid:
1339 		ret = fdt_setprop(blob, noff, "edid", edid_buf, 128);
1340 		if (ret == -FDT_ERR_NOSPACE) {
1341 			ret = fdt_increase_size(blob, 512);
1342 			if (!ret)
1343 				goto add_edid;
1344 			else
1345 				goto err_size;
1346 		} else if (ret < 0) {
1347 			printf("Can't add property: %s\n", fdt_strerror(ret));
1348 			return ret;
1349 		}
1350 	}
1351 	return 0;
1352 err_size:
1353 	printf("Can't increase blob size: %s\n", fdt_strerror(ret));
1354 	return ret;
1355 }
1356 #endif
1357 
1358 /*
1359  * Verify the physical address of device tree node for a given alias
1360  *
1361  * This function locates the device tree node of a given alias, and then
1362  * verifies that the physical address of that device matches the given
1363  * parameter.  It displays a message if there is a mismatch.
1364  *
1365  * Returns 1 on success, 0 on failure
1366  */
1367 int fdt_verify_alias_address(void *fdt, int anode, const char *alias, u64 addr)
1368 {
1369 	const char *path;
1370 	const fdt32_t *reg;
1371 	int node, len;
1372 	u64 dt_addr;
1373 
1374 	path = fdt_getprop(fdt, anode, alias, NULL);
1375 	if (!path) {
1376 		/* If there's no such alias, then it's not a failure */
1377 		return 1;
1378 	}
1379 
1380 	node = fdt_path_offset(fdt, path);
1381 	if (node < 0) {
1382 		printf("Warning: device tree alias '%s' points to invalid "
1383 		       "node %s.\n", alias, path);
1384 		return 0;
1385 	}
1386 
1387 	reg = fdt_getprop(fdt, node, "reg", &len);
1388 	if (!reg) {
1389 		printf("Warning: device tree node '%s' has no address.\n",
1390 		       path);
1391 		return 0;
1392 	}
1393 
1394 	dt_addr = fdt_translate_address(fdt, node, reg);
1395 	if (addr != dt_addr) {
1396 		printf("Warning: U-Boot configured device %s at address %llx,\n"
1397 		       " but the device tree has it address %llx.\n",
1398 		       alias, addr, dt_addr);
1399 		return 0;
1400 	}
1401 
1402 	return 1;
1403 }
1404 
1405 /*
1406  * Returns the base address of an SOC or PCI node
1407  */
1408 u64 fdt_get_base_address(void *fdt, int node)
1409 {
1410 	int size;
1411 	u32 naddr;
1412 	const fdt32_t *prop;
1413 
1414 	prop = fdt_getprop(fdt, node, "#address-cells", &size);
1415 	if (prop && size == 4)
1416 		naddr = be32_to_cpup(prop);
1417 	else
1418 		naddr = 2;
1419 
1420 	prop = fdt_getprop(fdt, node, "ranges", &size);
1421 
1422 	return prop ? fdt_translate_address(fdt, node, prop + naddr) : 0;
1423 }
1424