xref: /openbmc/u-boot/common/fdt_support.c (revision 42392849)
1 /*
2  * (C) Copyright 2007
3  * Gerald Van Baren, Custom IDEAS, vanbaren@cideas.com
4  *
5  * Copyright 2010-2011 Freescale Semiconductor, Inc.
6  *
7  * SPDX-License-Identifier:	GPL-2.0+
8  */
9 
10 #include <common.h>
11 #include <inttypes.h>
12 #include <stdio_dev.h>
13 #include <linux/ctype.h>
14 #include <linux/types.h>
15 #include <asm/global_data.h>
16 #include <libfdt.h>
17 #include <fdt_support.h>
18 #include <exports.h>
19 #include <fdtdec.h>
20 
21 /**
22  * fdt_getprop_u32_default_node - Return a node's property or a default
23  *
24  * @fdt: ptr to device tree
25  * @off: offset of node
26  * @cell: cell offset in property
27  * @prop: property name
28  * @dflt: default value if the property isn't found
29  *
30  * Convenience function to return a node's property or a default value if
31  * the property doesn't exist.
32  */
33 u32 fdt_getprop_u32_default_node(const void *fdt, int off, int cell,
34 				const char *prop, const u32 dflt)
35 {
36 	const fdt32_t *val;
37 	int len;
38 
39 	val = fdt_getprop(fdt, off, prop, &len);
40 
41 	/* Check if property exists */
42 	if (!val)
43 		return dflt;
44 
45 	/* Check if property is long enough */
46 	if (len < ((cell + 1) * sizeof(uint32_t)))
47 		return dflt;
48 
49 	return fdt32_to_cpu(*val);
50 }
51 
52 /**
53  * fdt_getprop_u32_default - Find a node and return it's property or a default
54  *
55  * @fdt: ptr to device tree
56  * @path: path of node
57  * @prop: property name
58  * @dflt: default value if the property isn't found
59  *
60  * Convenience function to find a node and return it's property or a
61  * default value if it doesn't exist.
62  */
63 u32 fdt_getprop_u32_default(const void *fdt, const char *path,
64 				const char *prop, const u32 dflt)
65 {
66 	int off;
67 
68 	off = fdt_path_offset(fdt, path);
69 	if (off < 0)
70 		return dflt;
71 
72 	return fdt_getprop_u32_default_node(fdt, off, 0, prop, dflt);
73 }
74 
75 /**
76  * fdt_find_and_setprop: Find a node and set it's property
77  *
78  * @fdt: ptr to device tree
79  * @node: path of node
80  * @prop: property name
81  * @val: ptr to new value
82  * @len: length of new property value
83  * @create: flag to create the property if it doesn't exist
84  *
85  * Convenience function to directly set a property given the path to the node.
86  */
87 int fdt_find_and_setprop(void *fdt, const char *node, const char *prop,
88 			 const void *val, int len, int create)
89 {
90 	int nodeoff = fdt_path_offset(fdt, node);
91 
92 	if (nodeoff < 0)
93 		return nodeoff;
94 
95 	if ((!create) && (fdt_get_property(fdt, nodeoff, prop, NULL) == NULL))
96 		return 0; /* create flag not set; so exit quietly */
97 
98 	return fdt_setprop(fdt, nodeoff, prop, val, len);
99 }
100 
101 /**
102  * fdt_find_or_add_subnode() - find or possibly add a subnode of a given node
103  *
104  * @fdt: pointer to the device tree blob
105  * @parentoffset: structure block offset of a node
106  * @name: name of the subnode to locate
107  *
108  * fdt_subnode_offset() finds a subnode of the node with a given name.
109  * If the subnode does not exist, it will be created.
110  */
111 int fdt_find_or_add_subnode(void *fdt, int parentoffset, const char *name)
112 {
113 	int offset;
114 
115 	offset = fdt_subnode_offset(fdt, parentoffset, name);
116 
117 	if (offset == -FDT_ERR_NOTFOUND)
118 		offset = fdt_add_subnode(fdt, parentoffset, name);
119 
120 	if (offset < 0)
121 		printf("%s: %s: %s\n", __func__, name, fdt_strerror(offset));
122 
123 	return offset;
124 }
125 
126 /* rename to CONFIG_OF_STDOUT_PATH ? */
127 #if defined(OF_STDOUT_PATH)
128 static int fdt_fixup_stdout(void *fdt, int chosenoff)
129 {
130 	return fdt_setprop(fdt, chosenoff, "linux,stdout-path",
131 			      OF_STDOUT_PATH, strlen(OF_STDOUT_PATH) + 1);
132 }
133 #elif defined(CONFIG_OF_STDOUT_VIA_ALIAS) && defined(CONFIG_CONS_INDEX)
134 static int fdt_fixup_stdout(void *fdt, int chosenoff)
135 {
136 	int err;
137 	int aliasoff;
138 	char sername[9] = { 0 };
139 	const void *path;
140 	int len;
141 	char tmp[256]; /* long enough */
142 
143 	sprintf(sername, "serial%d", CONFIG_CONS_INDEX - 1);
144 
145 	aliasoff = fdt_path_offset(fdt, "/aliases");
146 	if (aliasoff < 0) {
147 		err = aliasoff;
148 		goto noalias;
149 	}
150 
151 	path = fdt_getprop(fdt, aliasoff, sername, &len);
152 	if (!path) {
153 		err = len;
154 		goto noalias;
155 	}
156 
157 	/* fdt_setprop may break "path" so we copy it to tmp buffer */
158 	memcpy(tmp, path, len);
159 
160 	err = fdt_setprop(fdt, chosenoff, "linux,stdout-path", tmp, len);
161 	if (err < 0)
162 		printf("WARNING: could not set linux,stdout-path %s.\n",
163 		       fdt_strerror(err));
164 
165 	return err;
166 
167 noalias:
168 	printf("WARNING: %s: could not read %s alias: %s\n",
169 	       __func__, sername, fdt_strerror(err));
170 
171 	return 0;
172 }
173 #else
174 static int fdt_fixup_stdout(void *fdt, int chosenoff)
175 {
176 	return 0;
177 }
178 #endif
179 
180 static inline int fdt_setprop_uxx(void *fdt, int nodeoffset, const char *name,
181 				  uint64_t val, int is_u64)
182 {
183 	if (is_u64)
184 		return fdt_setprop_u64(fdt, nodeoffset, name, val);
185 	else
186 		return fdt_setprop_u32(fdt, nodeoffset, name, (uint32_t)val);
187 }
188 
189 int fdt_root(void *fdt)
190 {
191 	char *serial;
192 	int err;
193 
194 	err = fdt_check_header(fdt);
195 	if (err < 0) {
196 		printf("fdt_root: %s\n", fdt_strerror(err));
197 		return err;
198 	}
199 
200 	serial = getenv("serial#");
201 	if (serial) {
202 		err = fdt_setprop(fdt, 0, "serial-number", serial,
203 				  strlen(serial) + 1);
204 
205 		if (err < 0) {
206 			printf("WARNING: could not set serial-number %s.\n",
207 			       fdt_strerror(err));
208 			return err;
209 		}
210 	}
211 
212 	return 0;
213 }
214 
215 int fdt_initrd(void *fdt, ulong initrd_start, ulong initrd_end)
216 {
217 	int   nodeoffset;
218 	int   err, j, total;
219 	int is_u64;
220 	uint64_t addr, size;
221 
222 	/* just return if the size of initrd is zero */
223 	if (initrd_start == initrd_end)
224 		return 0;
225 
226 	/* find or create "/chosen" node. */
227 	nodeoffset = fdt_find_or_add_subnode(fdt, 0, "chosen");
228 	if (nodeoffset < 0)
229 		return nodeoffset;
230 
231 	total = fdt_num_mem_rsv(fdt);
232 
233 	/*
234 	 * Look for an existing entry and update it.  If we don't find
235 	 * the entry, we will j be the next available slot.
236 	 */
237 	for (j = 0; j < total; j++) {
238 		err = fdt_get_mem_rsv(fdt, j, &addr, &size);
239 		if (addr == initrd_start) {
240 			fdt_del_mem_rsv(fdt, j);
241 			break;
242 		}
243 	}
244 
245 	err = fdt_add_mem_rsv(fdt, initrd_start, initrd_end - initrd_start);
246 	if (err < 0) {
247 		printf("fdt_initrd: %s\n", fdt_strerror(err));
248 		return err;
249 	}
250 
251 	is_u64 = (fdt_address_cells(fdt, 0) == 2);
252 
253 	err = fdt_setprop_uxx(fdt, nodeoffset, "linux,initrd-start",
254 			      (uint64_t)initrd_start, is_u64);
255 
256 	if (err < 0) {
257 		printf("WARNING: could not set linux,initrd-start %s.\n",
258 		       fdt_strerror(err));
259 		return err;
260 	}
261 
262 	err = fdt_setprop_uxx(fdt, nodeoffset, "linux,initrd-end",
263 			      (uint64_t)initrd_end, is_u64);
264 
265 	if (err < 0) {
266 		printf("WARNING: could not set linux,initrd-end %s.\n",
267 		       fdt_strerror(err));
268 
269 		return err;
270 	}
271 
272 	return 0;
273 }
274 
275 int fdt_chosen(void *fdt)
276 {
277 	int   nodeoffset;
278 	int   err;
279 	char  *str;		/* used to set string properties */
280 
281 	err = fdt_check_header(fdt);
282 	if (err < 0) {
283 		printf("fdt_chosen: %s\n", fdt_strerror(err));
284 		return err;
285 	}
286 
287 	/* find or create "/chosen" node. */
288 	nodeoffset = fdt_find_or_add_subnode(fdt, 0, "chosen");
289 	if (nodeoffset < 0)
290 		return nodeoffset;
291 
292 	str = getenv("bootargs");
293 	if (str) {
294 		err = fdt_setprop(fdt, nodeoffset, "bootargs", str,
295 				  strlen(str) + 1);
296 		if (err < 0) {
297 			printf("WARNING: could not set bootargs %s.\n",
298 			       fdt_strerror(err));
299 			return err;
300 		}
301 	}
302 
303 	return fdt_fixup_stdout(fdt, nodeoffset);
304 }
305 
306 void do_fixup_by_path(void *fdt, const char *path, const char *prop,
307 		      const void *val, int len, int create)
308 {
309 #if defined(DEBUG)
310 	int i;
311 	debug("Updating property '%s/%s' = ", path, prop);
312 	for (i = 0; i < len; i++)
313 		debug(" %.2x", *(u8*)(val+i));
314 	debug("\n");
315 #endif
316 	int rc = fdt_find_and_setprop(fdt, path, prop, val, len, create);
317 	if (rc)
318 		printf("Unable to update property %s:%s, err=%s\n",
319 			path, prop, fdt_strerror(rc));
320 }
321 
322 void do_fixup_by_path_u32(void *fdt, const char *path, const char *prop,
323 			  u32 val, int create)
324 {
325 	fdt32_t tmp = cpu_to_fdt32(val);
326 	do_fixup_by_path(fdt, path, prop, &tmp, sizeof(tmp), create);
327 }
328 
329 void do_fixup_by_prop(void *fdt,
330 		      const char *pname, const void *pval, int plen,
331 		      const char *prop, const void *val, int len,
332 		      int create)
333 {
334 	int off;
335 #if defined(DEBUG)
336 	int i;
337 	debug("Updating property '%s' = ", prop);
338 	for (i = 0; i < len; i++)
339 		debug(" %.2x", *(u8*)(val+i));
340 	debug("\n");
341 #endif
342 	off = fdt_node_offset_by_prop_value(fdt, -1, pname, pval, plen);
343 	while (off != -FDT_ERR_NOTFOUND) {
344 		if (create || (fdt_get_property(fdt, off, prop, NULL) != NULL))
345 			fdt_setprop(fdt, off, prop, val, len);
346 		off = fdt_node_offset_by_prop_value(fdt, off, pname, pval, plen);
347 	}
348 }
349 
350 void do_fixup_by_prop_u32(void *fdt,
351 			  const char *pname, const void *pval, int plen,
352 			  const char *prop, u32 val, int create)
353 {
354 	fdt32_t tmp = cpu_to_fdt32(val);
355 	do_fixup_by_prop(fdt, pname, pval, plen, prop, &tmp, 4, create);
356 }
357 
358 void do_fixup_by_compat(void *fdt, const char *compat,
359 			const char *prop, const void *val, int len, int create)
360 {
361 	int off = -1;
362 #if defined(DEBUG)
363 	int i;
364 	debug("Updating property '%s' = ", prop);
365 	for (i = 0; i < len; i++)
366 		debug(" %.2x", *(u8*)(val+i));
367 	debug("\n");
368 #endif
369 	off = fdt_node_offset_by_compatible(fdt, -1, compat);
370 	while (off != -FDT_ERR_NOTFOUND) {
371 		if (create || (fdt_get_property(fdt, off, prop, NULL) != NULL))
372 			fdt_setprop(fdt, off, prop, val, len);
373 		off = fdt_node_offset_by_compatible(fdt, off, compat);
374 	}
375 }
376 
377 void do_fixup_by_compat_u32(void *fdt, const char *compat,
378 			    const char *prop, u32 val, int create)
379 {
380 	fdt32_t tmp = cpu_to_fdt32(val);
381 	do_fixup_by_compat(fdt, compat, prop, &tmp, 4, create);
382 }
383 
384 /*
385  * fdt_pack_reg - pack address and size array into the "reg"-suitable stream
386  */
387 static int fdt_pack_reg(const void *fdt, void *buf, u64 *address, u64 *size,
388 			int n)
389 {
390 	int i;
391 	int address_cells = fdt_address_cells(fdt, 0);
392 	int size_cells = fdt_size_cells(fdt, 0);
393 	char *p = buf;
394 
395 	for (i = 0; i < n; i++) {
396 		if (address_cells == 2)
397 			*(fdt64_t *)p = cpu_to_fdt64(address[i]);
398 		else
399 			*(fdt32_t *)p = cpu_to_fdt32(address[i]);
400 		p += 4 * address_cells;
401 
402 		if (size_cells == 2)
403 			*(fdt64_t *)p = cpu_to_fdt64(size[i]);
404 		else
405 			*(fdt32_t *)p = cpu_to_fdt32(size[i]);
406 		p += 4 * size_cells;
407 	}
408 
409 	return p - (char *)buf;
410 }
411 
412 #ifdef CONFIG_NR_DRAM_BANKS
413 #define MEMORY_BANKS_MAX CONFIG_NR_DRAM_BANKS
414 #else
415 #define MEMORY_BANKS_MAX 4
416 #endif
417 int fdt_fixup_memory_banks(void *blob, u64 start[], u64 size[], int banks)
418 {
419 	int err, nodeoffset;
420 	int len;
421 	u8 tmp[MEMORY_BANKS_MAX * 16]; /* Up to 64-bit address + 64-bit size */
422 
423 	if (banks > MEMORY_BANKS_MAX) {
424 		printf("%s: num banks %d exceeds hardcoded limit %d."
425 		       " Recompile with higher MEMORY_BANKS_MAX?\n",
426 		       __FUNCTION__, banks, MEMORY_BANKS_MAX);
427 		return -1;
428 	}
429 
430 	err = fdt_check_header(blob);
431 	if (err < 0) {
432 		printf("%s: %s\n", __FUNCTION__, fdt_strerror(err));
433 		return err;
434 	}
435 
436 	/* find or create "/memory" node. */
437 	nodeoffset = fdt_find_or_add_subnode(blob, 0, "memory");
438 	if (nodeoffset < 0)
439 			return nodeoffset;
440 
441 	err = fdt_setprop(blob, nodeoffset, "device_type", "memory",
442 			sizeof("memory"));
443 	if (err < 0) {
444 		printf("WARNING: could not set %s %s.\n", "device_type",
445 				fdt_strerror(err));
446 		return err;
447 	}
448 
449 	if (!banks)
450 		return 0;
451 
452 	len = fdt_pack_reg(blob, tmp, start, size, banks);
453 
454 	err = fdt_setprop(blob, nodeoffset, "reg", tmp, len);
455 	if (err < 0) {
456 		printf("WARNING: could not set %s %s.\n",
457 				"reg", fdt_strerror(err));
458 		return err;
459 	}
460 	return 0;
461 }
462 
463 int fdt_fixup_memory(void *blob, u64 start, u64 size)
464 {
465 	return fdt_fixup_memory_banks(blob, &start, &size, 1);
466 }
467 
468 void fdt_fixup_ethernet(void *fdt)
469 {
470 	int node, i, j;
471 	char *tmp, *end;
472 	char mac[16];
473 	const char *path;
474 	unsigned char mac_addr[6];
475 	int offset;
476 
477 	node = fdt_path_offset(fdt, "/aliases");
478 	if (node < 0)
479 		return;
480 
481 	for (offset = fdt_first_property_offset(fdt, node);
482 	     offset > 0;
483 	     offset = fdt_next_property_offset(fdt, offset)) {
484 		const char *name;
485 		int len = strlen("ethernet");
486 
487 		path = fdt_getprop_by_offset(fdt, offset, &name, NULL);
488 		if (!strncmp(name, "ethernet", len)) {
489 			i = trailing_strtol(name);
490 			if (i != -1) {
491 				if (i == 0)
492 					strcpy(mac, "ethaddr");
493 				else
494 					sprintf(mac, "eth%daddr", i);
495 			} else {
496 				continue;
497 			}
498 			tmp = getenv(mac);
499 			if (!tmp)
500 				continue;
501 
502 			for (j = 0; j < 6; j++) {
503 				mac_addr[j] = tmp ?
504 					      simple_strtoul(tmp, &end, 16) : 0;
505 				if (tmp)
506 					tmp = (*end) ? end + 1 : end;
507 			}
508 
509 			do_fixup_by_path(fdt, path, "mac-address",
510 					 &mac_addr, 6, 0);
511 			do_fixup_by_path(fdt, path, "local-mac-address",
512 					 &mac_addr, 6, 1);
513 		}
514 	}
515 }
516 
517 /* Resize the fdt to its actual size + a bit of padding */
518 int fdt_shrink_to_minimum(void *blob)
519 {
520 	int i;
521 	uint64_t addr, size;
522 	int total, ret;
523 	uint actualsize;
524 
525 	if (!blob)
526 		return 0;
527 
528 	total = fdt_num_mem_rsv(blob);
529 	for (i = 0; i < total; i++) {
530 		fdt_get_mem_rsv(blob, i, &addr, &size);
531 		if (addr == (uintptr_t)blob) {
532 			fdt_del_mem_rsv(blob, i);
533 			break;
534 		}
535 	}
536 
537 	/*
538 	 * Calculate the actual size of the fdt
539 	 * plus the size needed for 5 fdt_add_mem_rsv, one
540 	 * for the fdt itself and 4 for a possible initrd
541 	 * ((initrd-start + initrd-end) * 2 (name & value))
542 	 */
543 	actualsize = fdt_off_dt_strings(blob) +
544 		fdt_size_dt_strings(blob) + 5 * sizeof(struct fdt_reserve_entry);
545 
546 	/* Make it so the fdt ends on a page boundary */
547 	actualsize = ALIGN(actualsize + ((uintptr_t)blob & 0xfff), 0x1000);
548 	actualsize = actualsize - ((uintptr_t)blob & 0xfff);
549 
550 	/* Change the fdt header to reflect the correct size */
551 	fdt_set_totalsize(blob, actualsize);
552 
553 	/* Add the new reservation */
554 	ret = fdt_add_mem_rsv(blob, (uintptr_t)blob, actualsize);
555 	if (ret < 0)
556 		return ret;
557 
558 	return actualsize;
559 }
560 
561 #ifdef CONFIG_PCI
562 #define CONFIG_SYS_PCI_NR_INBOUND_WIN 4
563 
564 #define FDT_PCI_PREFETCH	(0x40000000)
565 #define FDT_PCI_MEM32		(0x02000000)
566 #define FDT_PCI_IO		(0x01000000)
567 #define FDT_PCI_MEM64		(0x03000000)
568 
569 int fdt_pci_dma_ranges(void *blob, int phb_off, struct pci_controller *hose) {
570 
571 	int addrcell, sizecell, len, r;
572 	u32 *dma_range;
573 	/* sized based on pci addr cells, size-cells, & address-cells */
574 	u32 dma_ranges[(3 + 2 + 2) * CONFIG_SYS_PCI_NR_INBOUND_WIN];
575 
576 	addrcell = fdt_getprop_u32_default(blob, "/", "#address-cells", 1);
577 	sizecell = fdt_getprop_u32_default(blob, "/", "#size-cells", 1);
578 
579 	dma_range = &dma_ranges[0];
580 	for (r = 0; r < hose->region_count; r++) {
581 		u64 bus_start, phys_start, size;
582 
583 		/* skip if !PCI_REGION_SYS_MEMORY */
584 		if (!(hose->regions[r].flags & PCI_REGION_SYS_MEMORY))
585 			continue;
586 
587 		bus_start = (u64)hose->regions[r].bus_start;
588 		phys_start = (u64)hose->regions[r].phys_start;
589 		size = (u64)hose->regions[r].size;
590 
591 		dma_range[0] = 0;
592 		if (size >= 0x100000000ull)
593 			dma_range[0] |= FDT_PCI_MEM64;
594 		else
595 			dma_range[0] |= FDT_PCI_MEM32;
596 		if (hose->regions[r].flags & PCI_REGION_PREFETCH)
597 			dma_range[0] |= FDT_PCI_PREFETCH;
598 #ifdef CONFIG_SYS_PCI_64BIT
599 		dma_range[1] = bus_start >> 32;
600 #else
601 		dma_range[1] = 0;
602 #endif
603 		dma_range[2] = bus_start & 0xffffffff;
604 
605 		if (addrcell == 2) {
606 			dma_range[3] = phys_start >> 32;
607 			dma_range[4] = phys_start & 0xffffffff;
608 		} else {
609 			dma_range[3] = phys_start & 0xffffffff;
610 		}
611 
612 		if (sizecell == 2) {
613 			dma_range[3 + addrcell + 0] = size >> 32;
614 			dma_range[3 + addrcell + 1] = size & 0xffffffff;
615 		} else {
616 			dma_range[3 + addrcell + 0] = size & 0xffffffff;
617 		}
618 
619 		dma_range += (3 + addrcell + sizecell);
620 	}
621 
622 	len = dma_range - &dma_ranges[0];
623 	if (len)
624 		fdt_setprop(blob, phb_off, "dma-ranges", &dma_ranges[0], len*4);
625 
626 	return 0;
627 }
628 #endif
629 
630 #ifdef CONFIG_FDT_FIXUP_NOR_FLASH_SIZE
631 /*
632  * Provide a weak default function to return the flash bank size.
633  * There might be multiple non-identical flash chips connected to one
634  * chip-select, so we need to pass an index as well.
635  */
636 u32 __flash_get_bank_size(int cs, int idx)
637 {
638 	extern flash_info_t flash_info[];
639 
640 	/*
641 	 * As default, a simple 1:1 mapping is provided. Boards with
642 	 * a different mapping need to supply a board specific mapping
643 	 * routine.
644 	 */
645 	return flash_info[cs].size;
646 }
647 u32 flash_get_bank_size(int cs, int idx)
648 	__attribute__((weak, alias("__flash_get_bank_size")));
649 
650 /*
651  * This function can be used to update the size in the "reg" property
652  * of all NOR FLASH device nodes. This is necessary for boards with
653  * non-fixed NOR FLASH sizes.
654  */
655 int fdt_fixup_nor_flash_size(void *blob)
656 {
657 	char compat[][16] = { "cfi-flash", "jedec-flash" };
658 	int off;
659 	int len;
660 	struct fdt_property *prop;
661 	u32 *reg, *reg2;
662 	int i;
663 
664 	for (i = 0; i < 2; i++) {
665 		off = fdt_node_offset_by_compatible(blob, -1, compat[i]);
666 		while (off != -FDT_ERR_NOTFOUND) {
667 			int idx;
668 
669 			/*
670 			 * Found one compatible node, so fixup the size
671 			 * int its reg properties
672 			 */
673 			prop = fdt_get_property_w(blob, off, "reg", &len);
674 			if (prop) {
675 				int tuple_size = 3 * sizeof(reg);
676 
677 				/*
678 				 * There might be multiple reg-tuples,
679 				 * so loop through them all
680 				 */
681 				reg = reg2 = (u32 *)&prop->data[0];
682 				for (idx = 0; idx < (len / tuple_size); idx++) {
683 					/*
684 					 * Update size in reg property
685 					 */
686 					reg[2] = flash_get_bank_size(reg[0],
687 								     idx);
688 
689 					/*
690 					 * Point to next reg tuple
691 					 */
692 					reg += 3;
693 				}
694 
695 				fdt_setprop(blob, off, "reg", reg2, len);
696 			}
697 
698 			/* Move to next compatible node */
699 			off = fdt_node_offset_by_compatible(blob, off,
700 							    compat[i]);
701 		}
702 	}
703 
704 	return 0;
705 }
706 #endif
707 
708 int fdt_increase_size(void *fdt, int add_len)
709 {
710 	int newlen;
711 
712 	newlen = fdt_totalsize(fdt) + add_len;
713 
714 	/* Open in place with a new len */
715 	return fdt_open_into(fdt, fdt, newlen);
716 }
717 
718 #ifdef CONFIG_FDT_FIXUP_PARTITIONS
719 #include <jffs2/load_kernel.h>
720 #include <mtd_node.h>
721 
722 struct reg_cell {
723 	unsigned int r0;
724 	unsigned int r1;
725 };
726 
727 int fdt_del_subnodes(const void *blob, int parent_offset)
728 {
729 	int off, ndepth;
730 	int ret;
731 
732 	for (ndepth = 0, off = fdt_next_node(blob, parent_offset, &ndepth);
733 	     (off >= 0) && (ndepth > 0);
734 	     off = fdt_next_node(blob, off, &ndepth)) {
735 		if (ndepth == 1) {
736 			debug("delete %s: offset: %x\n",
737 				fdt_get_name(blob, off, 0), off);
738 			ret = fdt_del_node((void *)blob, off);
739 			if (ret < 0) {
740 				printf("Can't delete node: %s\n",
741 					fdt_strerror(ret));
742 				return ret;
743 			} else {
744 				ndepth = 0;
745 				off = parent_offset;
746 			}
747 		}
748 	}
749 	return 0;
750 }
751 
752 int fdt_del_partitions(void *blob, int parent_offset)
753 {
754 	const void *prop;
755 	int ndepth = 0;
756 	int off;
757 	int ret;
758 
759 	off = fdt_next_node(blob, parent_offset, &ndepth);
760 	if (off > 0 && ndepth == 1) {
761 		prop = fdt_getprop(blob, off, "label", NULL);
762 		if (prop == NULL) {
763 			/*
764 			 * Could not find label property, nand {}; node?
765 			 * Check subnode, delete partitions there if any.
766 			 */
767 			return fdt_del_partitions(blob, off);
768 		} else {
769 			ret = fdt_del_subnodes(blob, parent_offset);
770 			if (ret < 0) {
771 				printf("Can't remove subnodes: %s\n",
772 					fdt_strerror(ret));
773 				return ret;
774 			}
775 		}
776 	}
777 	return 0;
778 }
779 
780 int fdt_node_set_part_info(void *blob, int parent_offset,
781 			   struct mtd_device *dev)
782 {
783 	struct list_head *pentry;
784 	struct part_info *part;
785 	struct reg_cell cell;
786 	int off, ndepth = 0;
787 	int part_num, ret;
788 	char buf[64];
789 
790 	ret = fdt_del_partitions(blob, parent_offset);
791 	if (ret < 0)
792 		return ret;
793 
794 	/*
795 	 * Check if it is nand {}; subnode, adjust
796 	 * the offset in this case
797 	 */
798 	off = fdt_next_node(blob, parent_offset, &ndepth);
799 	if (off > 0 && ndepth == 1)
800 		parent_offset = off;
801 
802 	part_num = 0;
803 	list_for_each_prev(pentry, &dev->parts) {
804 		int newoff;
805 
806 		part = list_entry(pentry, struct part_info, link);
807 
808 		debug("%2d: %-20s0x%08llx\t0x%08llx\t%d\n",
809 			part_num, part->name, part->size,
810 			part->offset, part->mask_flags);
811 
812 		sprintf(buf, "partition@%llx", part->offset);
813 add_sub:
814 		ret = fdt_add_subnode(blob, parent_offset, buf);
815 		if (ret == -FDT_ERR_NOSPACE) {
816 			ret = fdt_increase_size(blob, 512);
817 			if (!ret)
818 				goto add_sub;
819 			else
820 				goto err_size;
821 		} else if (ret < 0) {
822 			printf("Can't add partition node: %s\n",
823 				fdt_strerror(ret));
824 			return ret;
825 		}
826 		newoff = ret;
827 
828 		/* Check MTD_WRITEABLE_CMD flag */
829 		if (part->mask_flags & 1) {
830 add_ro:
831 			ret = fdt_setprop(blob, newoff, "read_only", NULL, 0);
832 			if (ret == -FDT_ERR_NOSPACE) {
833 				ret = fdt_increase_size(blob, 512);
834 				if (!ret)
835 					goto add_ro;
836 				else
837 					goto err_size;
838 			} else if (ret < 0)
839 				goto err_prop;
840 		}
841 
842 		cell.r0 = cpu_to_fdt32(part->offset);
843 		cell.r1 = cpu_to_fdt32(part->size);
844 add_reg:
845 		ret = fdt_setprop(blob, newoff, "reg", &cell, sizeof(cell));
846 		if (ret == -FDT_ERR_NOSPACE) {
847 			ret = fdt_increase_size(blob, 512);
848 			if (!ret)
849 				goto add_reg;
850 			else
851 				goto err_size;
852 		} else if (ret < 0)
853 			goto err_prop;
854 
855 add_label:
856 		ret = fdt_setprop_string(blob, newoff, "label", part->name);
857 		if (ret == -FDT_ERR_NOSPACE) {
858 			ret = fdt_increase_size(blob, 512);
859 			if (!ret)
860 				goto add_label;
861 			else
862 				goto err_size;
863 		} else if (ret < 0)
864 			goto err_prop;
865 
866 		part_num++;
867 	}
868 	return 0;
869 err_size:
870 	printf("Can't increase blob size: %s\n", fdt_strerror(ret));
871 	return ret;
872 err_prop:
873 	printf("Can't add property: %s\n", fdt_strerror(ret));
874 	return ret;
875 }
876 
877 /*
878  * Update partitions in nor/nand nodes using info from
879  * mtdparts environment variable. The nodes to update are
880  * specified by node_info structure which contains mtd device
881  * type and compatible string: E. g. the board code in
882  * ft_board_setup() could use:
883  *
884  *	struct node_info nodes[] = {
885  *		{ "fsl,mpc5121-nfc",    MTD_DEV_TYPE_NAND, },
886  *		{ "cfi-flash",          MTD_DEV_TYPE_NOR,  },
887  *	};
888  *
889  *	fdt_fixup_mtdparts(blob, nodes, ARRAY_SIZE(nodes));
890  */
891 void fdt_fixup_mtdparts(void *blob, void *node_info, int node_info_size)
892 {
893 	struct node_info *ni = node_info;
894 	struct mtd_device *dev;
895 	char *parts;
896 	int i, idx;
897 	int noff;
898 
899 	parts = getenv("mtdparts");
900 	if (!parts)
901 		return;
902 
903 	if (mtdparts_init() != 0)
904 		return;
905 
906 	for (i = 0; i < node_info_size; i++) {
907 		idx = 0;
908 		noff = fdt_node_offset_by_compatible(blob, -1, ni[i].compat);
909 		while (noff != -FDT_ERR_NOTFOUND) {
910 			debug("%s: %s, mtd dev type %d\n",
911 				fdt_get_name(blob, noff, 0),
912 				ni[i].compat, ni[i].type);
913 			dev = device_find(ni[i].type, idx++);
914 			if (dev) {
915 				if (fdt_node_set_part_info(blob, noff, dev))
916 					return; /* return on error */
917 			}
918 
919 			/* Jump to next flash node */
920 			noff = fdt_node_offset_by_compatible(blob, noff,
921 							     ni[i].compat);
922 		}
923 	}
924 }
925 #endif
926 
927 void fdt_del_node_and_alias(void *blob, const char *alias)
928 {
929 	int off = fdt_path_offset(blob, alias);
930 
931 	if (off < 0)
932 		return;
933 
934 	fdt_del_node(blob, off);
935 
936 	off = fdt_path_offset(blob, "/aliases");
937 	fdt_delprop(blob, off, alias);
938 }
939 
940 /* Max address size we deal with */
941 #define OF_MAX_ADDR_CELLS	4
942 #define OF_BAD_ADDR	FDT_ADDR_T_NONE
943 #define OF_CHECK_COUNTS(na)	((na) > 0 && (na) <= OF_MAX_ADDR_CELLS)
944 
945 /* Debug utility */
946 #ifdef DEBUG
947 static void of_dump_addr(const char *s, const fdt32_t *addr, int na)
948 {
949 	printf("%s", s);
950 	while(na--)
951 		printf(" %08x", *(addr++));
952 	printf("\n");
953 }
954 #else
955 static void of_dump_addr(const char *s, const fdt32_t *addr, int na) { }
956 #endif
957 
958 /* Callbacks for bus specific translators */
959 struct of_bus {
960 	const char	*name;
961 	const char	*addresses;
962 	void		(*count_cells)(void *blob, int parentoffset,
963 				int *addrc, int *sizec);
964 	u64		(*map)(fdt32_t *addr, const fdt32_t *range,
965 				int na, int ns, int pna);
966 	int		(*translate)(fdt32_t *addr, u64 offset, int na);
967 };
968 
969 /* Default translator (generic bus) */
970 void of_bus_default_count_cells(void *blob, int parentoffset,
971 					int *addrc, int *sizec)
972 {
973 	const fdt32_t *prop;
974 
975 	if (addrc)
976 		*addrc = fdt_address_cells(blob, parentoffset);
977 
978 	if (sizec) {
979 		prop = fdt_getprop(blob, parentoffset, "#size-cells", NULL);
980 		if (prop)
981 			*sizec = be32_to_cpup(prop);
982 		else
983 			*sizec = 1;
984 	}
985 }
986 
987 static u64 of_bus_default_map(fdt32_t *addr, const fdt32_t *range,
988 		int na, int ns, int pna)
989 {
990 	u64 cp, s, da;
991 
992 	cp = of_read_number(range, na);
993 	s  = of_read_number(range + na + pna, ns);
994 	da = of_read_number(addr, na);
995 
996 	debug("OF: default map, cp=%" PRIu64 ", s=%" PRIu64
997 	      ", da=%" PRIu64 "\n", cp, s, da);
998 
999 	if (da < cp || da >= (cp + s))
1000 		return OF_BAD_ADDR;
1001 	return da - cp;
1002 }
1003 
1004 static int of_bus_default_translate(fdt32_t *addr, u64 offset, int na)
1005 {
1006 	u64 a = of_read_number(addr, na);
1007 	memset(addr, 0, na * 4);
1008 	a += offset;
1009 	if (na > 1)
1010 		addr[na - 2] = cpu_to_fdt32(a >> 32);
1011 	addr[na - 1] = cpu_to_fdt32(a & 0xffffffffu);
1012 
1013 	return 0;
1014 }
1015 
1016 /* Array of bus specific translators */
1017 static struct of_bus of_busses[] = {
1018 	/* Default */
1019 	{
1020 		.name = "default",
1021 		.addresses = "reg",
1022 		.count_cells = of_bus_default_count_cells,
1023 		.map = of_bus_default_map,
1024 		.translate = of_bus_default_translate,
1025 	},
1026 };
1027 
1028 static int of_translate_one(void * blob, int parent, struct of_bus *bus,
1029 			    struct of_bus *pbus, fdt32_t *addr,
1030 			    int na, int ns, int pna, const char *rprop)
1031 {
1032 	const fdt32_t *ranges;
1033 	int rlen;
1034 	int rone;
1035 	u64 offset = OF_BAD_ADDR;
1036 
1037 	/* Normally, an absence of a "ranges" property means we are
1038 	 * crossing a non-translatable boundary, and thus the addresses
1039 	 * below the current not cannot be converted to CPU physical ones.
1040 	 * Unfortunately, while this is very clear in the spec, it's not
1041 	 * what Apple understood, and they do have things like /uni-n or
1042 	 * /ht nodes with no "ranges" property and a lot of perfectly
1043 	 * useable mapped devices below them. Thus we treat the absence of
1044 	 * "ranges" as equivalent to an empty "ranges" property which means
1045 	 * a 1:1 translation at that level. It's up to the caller not to try
1046 	 * to translate addresses that aren't supposed to be translated in
1047 	 * the first place. --BenH.
1048 	 */
1049 	ranges = fdt_getprop(blob, parent, rprop, &rlen);
1050 	if (ranges == NULL || rlen == 0) {
1051 		offset = of_read_number(addr, na);
1052 		memset(addr, 0, pna * 4);
1053 		debug("OF: no ranges, 1:1 translation\n");
1054 		goto finish;
1055 	}
1056 
1057 	debug("OF: walking ranges...\n");
1058 
1059 	/* Now walk through the ranges */
1060 	rlen /= 4;
1061 	rone = na + pna + ns;
1062 	for (; rlen >= rone; rlen -= rone, ranges += rone) {
1063 		offset = bus->map(addr, ranges, na, ns, pna);
1064 		if (offset != OF_BAD_ADDR)
1065 			break;
1066 	}
1067 	if (offset == OF_BAD_ADDR) {
1068 		debug("OF: not found !\n");
1069 		return 1;
1070 	}
1071 	memcpy(addr, ranges + na, 4 * pna);
1072 
1073  finish:
1074 	of_dump_addr("OF: parent translation for:", addr, pna);
1075 	debug("OF: with offset: %" PRIu64 "\n", offset);
1076 
1077 	/* Translate it into parent bus space */
1078 	return pbus->translate(addr, offset, pna);
1079 }
1080 
1081 /*
1082  * Translate an address from the device-tree into a CPU physical address,
1083  * this walks up the tree and applies the various bus mappings on the
1084  * way.
1085  *
1086  * Note: We consider that crossing any level with #size-cells == 0 to mean
1087  * that translation is impossible (that is we are not dealing with a value
1088  * that can be mapped to a cpu physical address). This is not really specified
1089  * that way, but this is traditionally the way IBM at least do things
1090  */
1091 static u64 __of_translate_address(void *blob, int node_offset, const fdt32_t *in_addr,
1092 				  const char *rprop)
1093 {
1094 	int parent;
1095 	struct of_bus *bus, *pbus;
1096 	fdt32_t addr[OF_MAX_ADDR_CELLS];
1097 	int na, ns, pna, pns;
1098 	u64 result = OF_BAD_ADDR;
1099 
1100 	debug("OF: ** translation for device %s **\n",
1101 		fdt_get_name(blob, node_offset, NULL));
1102 
1103 	/* Get parent & match bus type */
1104 	parent = fdt_parent_offset(blob, node_offset);
1105 	if (parent < 0)
1106 		goto bail;
1107 	bus = &of_busses[0];
1108 
1109 	/* Cound address cells & copy address locally */
1110 	bus->count_cells(blob, parent, &na, &ns);
1111 	if (!OF_CHECK_COUNTS(na)) {
1112 		printf("%s: Bad cell count for %s\n", __FUNCTION__,
1113 		       fdt_get_name(blob, node_offset, NULL));
1114 		goto bail;
1115 	}
1116 	memcpy(addr, in_addr, na * 4);
1117 
1118 	debug("OF: bus is %s (na=%d, ns=%d) on %s\n",
1119 	    bus->name, na, ns, fdt_get_name(blob, parent, NULL));
1120 	of_dump_addr("OF: translating address:", addr, na);
1121 
1122 	/* Translate */
1123 	for (;;) {
1124 		/* Switch to parent bus */
1125 		node_offset = parent;
1126 		parent = fdt_parent_offset(blob, node_offset);
1127 
1128 		/* If root, we have finished */
1129 		if (parent < 0) {
1130 			debug("OF: reached root node\n");
1131 			result = of_read_number(addr, na);
1132 			break;
1133 		}
1134 
1135 		/* Get new parent bus and counts */
1136 		pbus = &of_busses[0];
1137 		pbus->count_cells(blob, parent, &pna, &pns);
1138 		if (!OF_CHECK_COUNTS(pna)) {
1139 			printf("%s: Bad cell count for %s\n", __FUNCTION__,
1140 				fdt_get_name(blob, node_offset, NULL));
1141 			break;
1142 		}
1143 
1144 		debug("OF: parent bus is %s (na=%d, ns=%d) on %s\n",
1145 		    pbus->name, pna, pns, fdt_get_name(blob, parent, NULL));
1146 
1147 		/* Apply bus translation */
1148 		if (of_translate_one(blob, node_offset, bus, pbus,
1149 					addr, na, ns, pna, rprop))
1150 			break;
1151 
1152 		/* Complete the move up one level */
1153 		na = pna;
1154 		ns = pns;
1155 		bus = pbus;
1156 
1157 		of_dump_addr("OF: one level translation:", addr, na);
1158 	}
1159  bail:
1160 
1161 	return result;
1162 }
1163 
1164 u64 fdt_translate_address(void *blob, int node_offset, const fdt32_t *in_addr)
1165 {
1166 	return __of_translate_address(blob, node_offset, in_addr, "ranges");
1167 }
1168 
1169 /**
1170  * fdt_node_offset_by_compat_reg: Find a node that matches compatiable and
1171  * who's reg property matches a physical cpu address
1172  *
1173  * @blob: ptr to device tree
1174  * @compat: compatiable string to match
1175  * @compat_off: property name
1176  *
1177  */
1178 int fdt_node_offset_by_compat_reg(void *blob, const char *compat,
1179 					phys_addr_t compat_off)
1180 {
1181 	int len, off = fdt_node_offset_by_compatible(blob, -1, compat);
1182 	while (off != -FDT_ERR_NOTFOUND) {
1183 		const fdt32_t *reg = fdt_getprop(blob, off, "reg", &len);
1184 		if (reg) {
1185 			if (compat_off == fdt_translate_address(blob, off, reg))
1186 				return off;
1187 		}
1188 		off = fdt_node_offset_by_compatible(blob, off, compat);
1189 	}
1190 
1191 	return -FDT_ERR_NOTFOUND;
1192 }
1193 
1194 /**
1195  * fdt_alloc_phandle: Return next free phandle value
1196  *
1197  * @blob: ptr to device tree
1198  */
1199 int fdt_alloc_phandle(void *blob)
1200 {
1201 	int offset;
1202 	uint32_t phandle = 0;
1203 
1204 	for (offset = fdt_next_node(blob, -1, NULL); offset >= 0;
1205 	     offset = fdt_next_node(blob, offset, NULL)) {
1206 		phandle = max(phandle, fdt_get_phandle(blob, offset));
1207 	}
1208 
1209 	return phandle + 1;
1210 }
1211 
1212 /*
1213  * fdt_set_phandle: Create a phandle property for the given node
1214  *
1215  * @fdt: ptr to device tree
1216  * @nodeoffset: node to update
1217  * @phandle: phandle value to set (must be unique)
1218  */
1219 int fdt_set_phandle(void *fdt, int nodeoffset, uint32_t phandle)
1220 {
1221 	int ret;
1222 
1223 #ifdef DEBUG
1224 	int off = fdt_node_offset_by_phandle(fdt, phandle);
1225 
1226 	if ((off >= 0) && (off != nodeoffset)) {
1227 		char buf[64];
1228 
1229 		fdt_get_path(fdt, nodeoffset, buf, sizeof(buf));
1230 		printf("Trying to update node %s with phandle %u ",
1231 		       buf, phandle);
1232 
1233 		fdt_get_path(fdt, off, buf, sizeof(buf));
1234 		printf("that already exists in node %s.\n", buf);
1235 		return -FDT_ERR_BADPHANDLE;
1236 	}
1237 #endif
1238 
1239 	ret = fdt_setprop_cell(fdt, nodeoffset, "phandle", phandle);
1240 	if (ret < 0)
1241 		return ret;
1242 
1243 	/*
1244 	 * For now, also set the deprecated "linux,phandle" property, so that we
1245 	 * don't break older kernels.
1246 	 */
1247 	ret = fdt_setprop_cell(fdt, nodeoffset, "linux,phandle", phandle);
1248 
1249 	return ret;
1250 }
1251 
1252 /*
1253  * fdt_create_phandle: Create a phandle property for the given node
1254  *
1255  * @fdt: ptr to device tree
1256  * @nodeoffset: node to update
1257  */
1258 unsigned int fdt_create_phandle(void *fdt, int nodeoffset)
1259 {
1260 	/* see if there is a phandle already */
1261 	int phandle = fdt_get_phandle(fdt, nodeoffset);
1262 
1263 	/* if we got 0, means no phandle so create one */
1264 	if (phandle == 0) {
1265 		int ret;
1266 
1267 		phandle = fdt_alloc_phandle(fdt);
1268 		ret = fdt_set_phandle(fdt, nodeoffset, phandle);
1269 		if (ret < 0) {
1270 			printf("Can't set phandle %u: %s\n", phandle,
1271 			       fdt_strerror(ret));
1272 			return 0;
1273 		}
1274 	}
1275 
1276 	return phandle;
1277 }
1278 
1279 /*
1280  * fdt_set_node_status: Set status for the given node
1281  *
1282  * @fdt: ptr to device tree
1283  * @nodeoffset: node to update
1284  * @status: FDT_STATUS_OKAY, FDT_STATUS_DISABLED,
1285  *	    FDT_STATUS_FAIL, FDT_STATUS_FAIL_ERROR_CODE
1286  * @error_code: optional, only used if status is FDT_STATUS_FAIL_ERROR_CODE
1287  */
1288 int fdt_set_node_status(void *fdt, int nodeoffset,
1289 			enum fdt_status status, unsigned int error_code)
1290 {
1291 	char buf[16];
1292 	int ret = 0;
1293 
1294 	if (nodeoffset < 0)
1295 		return nodeoffset;
1296 
1297 	switch (status) {
1298 	case FDT_STATUS_OKAY:
1299 		ret = fdt_setprop_string(fdt, nodeoffset, "status", "okay");
1300 		break;
1301 	case FDT_STATUS_DISABLED:
1302 		ret = fdt_setprop_string(fdt, nodeoffset, "status", "disabled");
1303 		break;
1304 	case FDT_STATUS_FAIL:
1305 		ret = fdt_setprop_string(fdt, nodeoffset, "status", "fail");
1306 		break;
1307 	case FDT_STATUS_FAIL_ERROR_CODE:
1308 		sprintf(buf, "fail-%d", error_code);
1309 		ret = fdt_setprop_string(fdt, nodeoffset, "status", buf);
1310 		break;
1311 	default:
1312 		printf("Invalid fdt status: %x\n", status);
1313 		ret = -1;
1314 		break;
1315 	}
1316 
1317 	return ret;
1318 }
1319 
1320 /*
1321  * fdt_set_status_by_alias: Set status for the given node given an alias
1322  *
1323  * @fdt: ptr to device tree
1324  * @alias: alias of node to update
1325  * @status: FDT_STATUS_OKAY, FDT_STATUS_DISABLED,
1326  *	    FDT_STATUS_FAIL, FDT_STATUS_FAIL_ERROR_CODE
1327  * @error_code: optional, only used if status is FDT_STATUS_FAIL_ERROR_CODE
1328  */
1329 int fdt_set_status_by_alias(void *fdt, const char* alias,
1330 			    enum fdt_status status, unsigned int error_code)
1331 {
1332 	int offset = fdt_path_offset(fdt, alias);
1333 
1334 	return fdt_set_node_status(fdt, offset, status, error_code);
1335 }
1336 
1337 #if defined(CONFIG_VIDEO) || defined(CONFIG_LCD)
1338 int fdt_add_edid(void *blob, const char *compat, unsigned char *edid_buf)
1339 {
1340 	int noff;
1341 	int ret;
1342 
1343 	noff = fdt_node_offset_by_compatible(blob, -1, compat);
1344 	if (noff != -FDT_ERR_NOTFOUND) {
1345 		debug("%s: %s\n", fdt_get_name(blob, noff, 0), compat);
1346 add_edid:
1347 		ret = fdt_setprop(blob, noff, "edid", edid_buf, 128);
1348 		if (ret == -FDT_ERR_NOSPACE) {
1349 			ret = fdt_increase_size(blob, 512);
1350 			if (!ret)
1351 				goto add_edid;
1352 			else
1353 				goto err_size;
1354 		} else if (ret < 0) {
1355 			printf("Can't add property: %s\n", fdt_strerror(ret));
1356 			return ret;
1357 		}
1358 	}
1359 	return 0;
1360 err_size:
1361 	printf("Can't increase blob size: %s\n", fdt_strerror(ret));
1362 	return ret;
1363 }
1364 #endif
1365 
1366 /*
1367  * Verify the physical address of device tree node for a given alias
1368  *
1369  * This function locates the device tree node of a given alias, and then
1370  * verifies that the physical address of that device matches the given
1371  * parameter.  It displays a message if there is a mismatch.
1372  *
1373  * Returns 1 on success, 0 on failure
1374  */
1375 int fdt_verify_alias_address(void *fdt, int anode, const char *alias, u64 addr)
1376 {
1377 	const char *path;
1378 	const fdt32_t *reg;
1379 	int node, len;
1380 	u64 dt_addr;
1381 
1382 	path = fdt_getprop(fdt, anode, alias, NULL);
1383 	if (!path) {
1384 		/* If there's no such alias, then it's not a failure */
1385 		return 1;
1386 	}
1387 
1388 	node = fdt_path_offset(fdt, path);
1389 	if (node < 0) {
1390 		printf("Warning: device tree alias '%s' points to invalid "
1391 		       "node %s.\n", alias, path);
1392 		return 0;
1393 	}
1394 
1395 	reg = fdt_getprop(fdt, node, "reg", &len);
1396 	if (!reg) {
1397 		printf("Warning: device tree node '%s' has no address.\n",
1398 		       path);
1399 		return 0;
1400 	}
1401 
1402 	dt_addr = fdt_translate_address(fdt, node, reg);
1403 	if (addr != dt_addr) {
1404 		printf("Warning: U-Boot configured device %s at address %"
1405 		       PRIx64 ",\n but the device tree has it address %"
1406 		       PRIx64 ".\n", alias, addr, dt_addr);
1407 		return 0;
1408 	}
1409 
1410 	return 1;
1411 }
1412 
1413 /*
1414  * Returns the base address of an SOC or PCI node
1415  */
1416 u64 fdt_get_base_address(void *fdt, int node)
1417 {
1418 	int size;
1419 	u32 naddr;
1420 	const fdt32_t *prop;
1421 
1422 	naddr = fdt_address_cells(fdt, node);
1423 
1424 	prop = fdt_getprop(fdt, node, "ranges", &size);
1425 
1426 	return prop ? fdt_translate_address(fdt, node, prop + naddr) : 0;
1427 }
1428 
1429 /*
1430  * Read a property of size <prop_len>. Currently only supports 1 or 2 cells.
1431  */
1432 static int fdt_read_prop(const fdt32_t *prop, int prop_len, int cell_off,
1433 			 uint64_t *val, int cells)
1434 {
1435 	const fdt32_t *prop32 = &prop[cell_off];
1436 	const fdt64_t *prop64 = (const fdt64_t *)&prop[cell_off];
1437 
1438 	if ((cell_off + cells) > prop_len)
1439 		return -FDT_ERR_NOSPACE;
1440 
1441 	switch (cells) {
1442 	case 1:
1443 		*val = fdt32_to_cpu(*prop32);
1444 		break;
1445 	case 2:
1446 		*val = fdt64_to_cpu(*prop64);
1447 		break;
1448 	default:
1449 		return -FDT_ERR_NOSPACE;
1450 	}
1451 
1452 	return 0;
1453 }
1454 
1455 /**
1456  * fdt_read_range - Read a node's n'th range property
1457  *
1458  * @fdt: ptr to device tree
1459  * @node: offset of node
1460  * @n: range index
1461  * @child_addr: pointer to storage for the "child address" field
1462  * @addr: pointer to storage for the CPU view translated physical start
1463  * @len: pointer to storage for the range length
1464  *
1465  * Convenience function that reads and interprets a specific range out of
1466  * a number of the "ranges" property array.
1467  */
1468 int fdt_read_range(void *fdt, int node, int n, uint64_t *child_addr,
1469 		   uint64_t *addr, uint64_t *len)
1470 {
1471 	int pnode = fdt_parent_offset(fdt, node);
1472 	const fdt32_t *ranges;
1473 	int pacells;
1474 	int acells;
1475 	int scells;
1476 	int ranges_len;
1477 	int cell = 0;
1478 	int r = 0;
1479 
1480 	/*
1481 	 * The "ranges" property is an array of
1482 	 * { <child address> <parent address> <size in child address space> }
1483 	 *
1484 	 * All 3 elements can span a diffent number of cells. Fetch their size.
1485 	 */
1486 	pacells = fdt_getprop_u32_default_node(fdt, pnode, 0, "#address-cells", 1);
1487 	acells = fdt_getprop_u32_default_node(fdt, node, 0, "#address-cells", 1);
1488 	scells = fdt_getprop_u32_default_node(fdt, node, 0, "#size-cells", 1);
1489 
1490 	/* Now try to get the ranges property */
1491 	ranges = fdt_getprop(fdt, node, "ranges", &ranges_len);
1492 	if (!ranges)
1493 		return -FDT_ERR_NOTFOUND;
1494 	ranges_len /= sizeof(uint32_t);
1495 
1496 	/* Jump to the n'th entry */
1497 	cell = n * (pacells + acells + scells);
1498 
1499 	/* Read <child address> */
1500 	if (child_addr) {
1501 		r = fdt_read_prop(ranges, ranges_len, cell, child_addr,
1502 				  acells);
1503 		if (r)
1504 			return r;
1505 	}
1506 	cell += acells;
1507 
1508 	/* Read <parent address> */
1509 	if (addr)
1510 		*addr = fdt_translate_address(fdt, node, ranges + cell);
1511 	cell += pacells;
1512 
1513 	/* Read <size in child address space> */
1514 	if (len) {
1515 		r = fdt_read_prop(ranges, ranges_len, cell, len, scells);
1516 		if (r)
1517 			return r;
1518 	}
1519 
1520 	return 0;
1521 }
1522 
1523 /**
1524  * fdt_setup_simplefb_node - Fill and enable a simplefb node
1525  *
1526  * @fdt: ptr to device tree
1527  * @node: offset of the simplefb node
1528  * @base_address: framebuffer base address
1529  * @width: width in pixels
1530  * @height: height in pixels
1531  * @stride: bytes per line
1532  * @format: pixel format string
1533  *
1534  * Convenience function to fill and enable a simplefb node.
1535  */
1536 int fdt_setup_simplefb_node(void *fdt, int node, u64 base_address, u32 width,
1537 			    u32 height, u32 stride, const char *format)
1538 {
1539 	char name[32];
1540 	fdt32_t cells[4];
1541 	int i, addrc, sizec, ret;
1542 
1543 	of_bus_default_count_cells(fdt, fdt_parent_offset(fdt, node),
1544 				   &addrc, &sizec);
1545 	i = 0;
1546 	if (addrc == 2)
1547 		cells[i++] = cpu_to_fdt32(base_address >> 32);
1548 	cells[i++] = cpu_to_fdt32(base_address);
1549 	if (sizec == 2)
1550 		cells[i++] = 0;
1551 	cells[i++] = cpu_to_fdt32(height * stride);
1552 
1553 	ret = fdt_setprop(fdt, node, "reg", cells, sizeof(cells[0]) * i);
1554 	if (ret < 0)
1555 		return ret;
1556 
1557 	snprintf(name, sizeof(name), "framebuffer@%" PRIx64, base_address);
1558 	ret = fdt_set_name(fdt, node, name);
1559 	if (ret < 0)
1560 		return ret;
1561 
1562 	ret = fdt_setprop_u32(fdt, node, "width", width);
1563 	if (ret < 0)
1564 		return ret;
1565 
1566 	ret = fdt_setprop_u32(fdt, node, "height", height);
1567 	if (ret < 0)
1568 		return ret;
1569 
1570 	ret = fdt_setprop_u32(fdt, node, "stride", stride);
1571 	if (ret < 0)
1572 		return ret;
1573 
1574 	ret = fdt_setprop_string(fdt, node, "format", format);
1575 	if (ret < 0)
1576 		return ret;
1577 
1578 	ret = fdt_setprop_string(fdt, node, "status", "okay");
1579 	if (ret < 0)
1580 		return ret;
1581 
1582 	return 0;
1583 }
1584 
1585 /*
1586  * Update native-mode in display-timings from display environment variable.
1587  * The node to update are specified by path.
1588  */
1589 int fdt_fixup_display(void *blob, const char *path, const char *display)
1590 {
1591 	int off, toff;
1592 
1593 	if (!display || !path)
1594 		return -FDT_ERR_NOTFOUND;
1595 
1596 	toff = fdt_path_offset(blob, path);
1597 	if (toff >= 0)
1598 		toff = fdt_subnode_offset(blob, toff, "display-timings");
1599 	if (toff < 0)
1600 		return toff;
1601 
1602 	for (off = fdt_first_subnode(blob, toff);
1603 	     off >= 0;
1604 	     off = fdt_next_subnode(blob, off)) {
1605 		uint32_t h = fdt_get_phandle(blob, off);
1606 		debug("%s:0x%x\n", fdt_get_name(blob, off, NULL),
1607 		      fdt32_to_cpu(h));
1608 		if (strcasecmp(fdt_get_name(blob, off, NULL), display) == 0)
1609 			return fdt_setprop_u32(blob, toff, "native-mode", h);
1610 	}
1611 	return toff;
1612 }
1613