xref: /rk3399_rockchip-uboot/common/fdt_support.c (revision d14f7e1ef9967e7b1e8b70125c0d2eb27fe5fc06)
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 = env_get("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 = env_get("bootargs");
293 	if (str) {
294 #ifdef CONFIG_ARCH_ROCKCHIP
295 		const char *bootargs;
296 
297 		bootargs = fdt_getprop(fdt, nodeoffset, "bootargs", NULL);
298 		if (bootargs) {
299 			/* Append kernel bootargs */
300 			env_update("bootargs", bootargs);
301 			/*
302 			 * Initrd fixup: remove unused "initrd=0x...,0x...",
303 			 * this for compatible with legacy parameter.txt
304 			 */
305 			env_delete("bootargs", "initrd=");
306 			str = env_get("bootargs");
307 		}
308 #endif
309 		err = fdt_setprop(fdt, nodeoffset, "bootargs", str,
310 				  strlen(str) + 1);
311 		if (err < 0) {
312 			printf("WARNING: could not set bootargs %s.\n",
313 			       fdt_strerror(err));
314 			return err;
315 		}
316 	}
317 
318 	return fdt_fixup_stdout(fdt, nodeoffset);
319 }
320 
321 void do_fixup_by_path(void *fdt, const char *path, const char *prop,
322 		      const void *val, int len, int create)
323 {
324 #if defined(DEBUG)
325 	int i;
326 	debug("Updating property '%s/%s' = ", path, prop);
327 	for (i = 0; i < len; i++)
328 		debug(" %.2x", *(u8*)(val+i));
329 	debug("\n");
330 #endif
331 	int rc = fdt_find_and_setprop(fdt, path, prop, val, len, create);
332 	if (rc)
333 		printf("Unable to update property %s:%s, err=%s\n",
334 			path, prop, fdt_strerror(rc));
335 }
336 
337 void do_fixup_by_path_u32(void *fdt, const char *path, const char *prop,
338 			  u32 val, int create)
339 {
340 	fdt32_t tmp = cpu_to_fdt32(val);
341 	do_fixup_by_path(fdt, path, prop, &tmp, sizeof(tmp), create);
342 }
343 
344 void do_fixup_by_prop(void *fdt,
345 		      const char *pname, const void *pval, int plen,
346 		      const char *prop, const void *val, int len,
347 		      int create)
348 {
349 	int off;
350 #if defined(DEBUG)
351 	int i;
352 	debug("Updating property '%s' = ", prop);
353 	for (i = 0; i < len; i++)
354 		debug(" %.2x", *(u8*)(val+i));
355 	debug("\n");
356 #endif
357 	off = fdt_node_offset_by_prop_value(fdt, -1, pname, pval, plen);
358 	while (off != -FDT_ERR_NOTFOUND) {
359 		if (create || (fdt_get_property(fdt, off, prop, NULL) != NULL))
360 			fdt_setprop(fdt, off, prop, val, len);
361 		off = fdt_node_offset_by_prop_value(fdt, off, pname, pval, plen);
362 	}
363 }
364 
365 void do_fixup_by_prop_u32(void *fdt,
366 			  const char *pname, const void *pval, int plen,
367 			  const char *prop, u32 val, int create)
368 {
369 	fdt32_t tmp = cpu_to_fdt32(val);
370 	do_fixup_by_prop(fdt, pname, pval, plen, prop, &tmp, 4, create);
371 }
372 
373 void do_fixup_by_compat(void *fdt, const char *compat,
374 			const char *prop, const void *val, int len, int create)
375 {
376 	int off = -1;
377 #if defined(DEBUG)
378 	int i;
379 	debug("Updating property '%s' = ", prop);
380 	for (i = 0; i < len; i++)
381 		debug(" %.2x", *(u8*)(val+i));
382 	debug("\n");
383 #endif
384 	off = fdt_node_offset_by_compatible(fdt, -1, compat);
385 	while (off != -FDT_ERR_NOTFOUND) {
386 		if (create || (fdt_get_property(fdt, off, prop, NULL) != NULL))
387 			fdt_setprop(fdt, off, prop, val, len);
388 		off = fdt_node_offset_by_compatible(fdt, off, compat);
389 	}
390 }
391 
392 void do_fixup_by_compat_u32(void *fdt, const char *compat,
393 			    const char *prop, u32 val, int create)
394 {
395 	fdt32_t tmp = cpu_to_fdt32(val);
396 	do_fixup_by_compat(fdt, compat, prop, &tmp, 4, create);
397 }
398 
399 #ifdef CONFIG_ARCH_FIXUP_FDT_MEMORY
400 /*
401  * fdt_pack_reg - pack address and size array into the "reg"-suitable stream
402  */
403 static int fdt_pack_reg(const void *fdt, void *buf, u64 *address, u64 *size,
404 			int n)
405 {
406 	int i;
407 	int address_cells = fdt_address_cells(fdt, 0);
408 	int size_cells = fdt_size_cells(fdt, 0);
409 	char *p = buf;
410 
411 	for (i = 0; i < n; i++) {
412 		if (address_cells == 2)
413 			*(fdt64_t *)p = cpu_to_fdt64(address[i]);
414 		else
415 			*(fdt32_t *)p = cpu_to_fdt32(address[i]);
416 		p += 4 * address_cells;
417 
418 		if (size_cells == 2)
419 			*(fdt64_t *)p = cpu_to_fdt64(size[i]);
420 		else
421 			*(fdt32_t *)p = cpu_to_fdt32(size[i]);
422 		p += 4 * size_cells;
423 	}
424 
425 	return p - (char *)buf;
426 }
427 
428 int fdt_record_loadable(void *blob, u32 index, const char *name,
429 			uintptr_t load_addr, u32 size, uintptr_t entry_point,
430 			const char *type, const char *os)
431 {
432 	int err, node;
433 
434 	err = fdt_check_header(blob);
435 	if (err < 0) {
436 		printf("%s: %s\n", __func__, fdt_strerror(err));
437 		return err;
438 	}
439 
440 	/* find or create "/fit-images" node */
441 	node = fdt_find_or_add_subnode(blob, 0, "fit-images");
442 	if (node < 0)
443 			return node;
444 
445 	/* find or create "/fit-images/<name>" node */
446 	node = fdt_find_or_add_subnode(blob, node, name);
447 	if (node < 0)
448 		return node;
449 
450 	/*
451 	 * We record these as 32bit entities, possibly truncating addresses.
452 	 * However, spl_fit.c is not 64bit safe either: i.e. we should not
453 	 * have an issue here.
454 	 */
455 	fdt_setprop_u32(blob, node, "load-addr", load_addr);
456 	if (entry_point != -1)
457 		fdt_setprop_u32(blob, node, "entry-point", entry_point);
458 	fdt_setprop_u32(blob, node, "size", size);
459 	if (type)
460 		fdt_setprop_string(blob, node, "type", type);
461 	if (os)
462 		fdt_setprop_string(blob, node, "os", os);
463 
464 	return node;
465 }
466 
467 #ifdef CONFIG_NR_DRAM_BANKS
468 #define MEMORY_BANKS_MAX CONFIG_NR_DRAM_BANKS
469 #else
470 #define MEMORY_BANKS_MAX 4
471 #endif
472 int fdt_fixup_memory_banks(void *blob, u64 start[], u64 size[], int banks)
473 {
474 	int err, nodeoffset;
475 	int len;
476 	u8 tmp[MEMORY_BANKS_MAX * 16]; /* Up to 64-bit address + 64-bit size */
477 
478 	if (banks > MEMORY_BANKS_MAX) {
479 		printf("%s: num banks %d exceeds hardcoded limit %d."
480 		       " Recompile with higher MEMORY_BANKS_MAX?\n",
481 		       __FUNCTION__, banks, MEMORY_BANKS_MAX);
482 		return -1;
483 	}
484 
485 	err = fdt_check_header(blob);
486 	if (err < 0) {
487 		printf("%s: %s\n", __FUNCTION__, fdt_strerror(err));
488 		return err;
489 	}
490 
491 	/* find or create "/memory" node. */
492 	nodeoffset = fdt_find_or_add_subnode(blob, 0, "memory");
493 	if (nodeoffset < 0)
494 			return nodeoffset;
495 
496 	err = fdt_setprop(blob, nodeoffset, "device_type", "memory",
497 			sizeof("memory"));
498 	if (err < 0) {
499 		printf("WARNING: could not set %s %s.\n", "device_type",
500 				fdt_strerror(err));
501 		return err;
502 	}
503 
504 	if (!banks)
505 		return 0;
506 
507 	len = fdt_pack_reg(blob, tmp, start, size, banks);
508 
509 	err = fdt_setprop(blob, nodeoffset, "reg", tmp, len);
510 	if (err < 0) {
511 		printf("WARNING: could not set %s %s.\n",
512 				"reg", fdt_strerror(err));
513 		return err;
514 	}
515 	return 0;
516 }
517 #endif
518 
519 int fdt_fixup_memory(void *blob, u64 start, u64 size)
520 {
521 	return fdt_fixup_memory_banks(blob, &start, &size, 1);
522 }
523 
524 void fdt_fixup_ethernet(void *fdt)
525 {
526 	int i = 0, j, prop;
527 	char *tmp, *end;
528 	char mac[16];
529 	const char *path;
530 	unsigned char mac_addr[ARP_HLEN];
531 	int offset;
532 #ifdef FDT_SEQ_MACADDR_FROM_ENV
533 	int nodeoff;
534 	const struct fdt_property *fdt_prop;
535 #endif
536 
537 	if (fdt_path_offset(fdt, "/aliases") < 0)
538 		return;
539 
540 	/* Cycle through all aliases */
541 	for (prop = 0; ; prop++) {
542 		const char *name;
543 
544 		/* FDT might have been edited, recompute the offset */
545 		offset = fdt_first_property_offset(fdt,
546 			fdt_path_offset(fdt, "/aliases"));
547 		/* Select property number 'prop' */
548 		for (j = 0; j < prop; j++)
549 			offset = fdt_next_property_offset(fdt, offset);
550 
551 		if (offset < 0)
552 			break;
553 
554 		path = fdt_getprop_by_offset(fdt, offset, &name, NULL);
555 		if (!strncmp(name, "ethernet", 8)) {
556 			/* Treat plain "ethernet" same as "ethernet0". */
557 			if (!strcmp(name, "ethernet")
558 #ifdef FDT_SEQ_MACADDR_FROM_ENV
559 			 || !strcmp(name, "ethernet0")
560 #endif
561 			)
562 				i = 0;
563 #ifndef FDT_SEQ_MACADDR_FROM_ENV
564 			else
565 				i = trailing_strtol(name);
566 #endif
567 			if (i != -1) {
568 				if (i == 0)
569 					strcpy(mac, "ethaddr");
570 				else
571 					sprintf(mac, "eth%daddr", i);
572 			} else {
573 				continue;
574 			}
575 #ifdef FDT_SEQ_MACADDR_FROM_ENV
576 			nodeoff = fdt_path_offset(fdt, path);
577 			fdt_prop = fdt_get_property(fdt, nodeoff, "status",
578 						    NULL);
579 			if (fdt_prop && !strcmp(fdt_prop->data, "disabled"))
580 				continue;
581 			i++;
582 #endif
583 			tmp = env_get(mac);
584 			if (!tmp)
585 				continue;
586 
587 			for (j = 0; j < 6; j++) {
588 				mac_addr[j] = tmp ?
589 					      simple_strtoul(tmp, &end, 16) : 0;
590 				if (tmp)
591 					tmp = (*end) ? end + 1 : end;
592 			}
593 
594 			do_fixup_by_path(fdt, path, "mac-address",
595 					 &mac_addr, 6, 0);
596 			do_fixup_by_path(fdt, path, "local-mac-address",
597 					 &mac_addr, 6, 1);
598 		}
599 	}
600 }
601 
602 /* Resize the fdt to its actual size + a bit of padding */
603 int fdt_shrink_to_minimum(void *blob, uint extrasize)
604 {
605 	int i;
606 	uint64_t addr, size;
607 	int total, ret;
608 	uint actualsize;
609 
610 	if (!blob)
611 		return 0;
612 
613 	total = fdt_num_mem_rsv(blob);
614 	for (i = 0; i < total; i++) {
615 		fdt_get_mem_rsv(blob, i, &addr, &size);
616 		if (addr == (uintptr_t)blob) {
617 			fdt_del_mem_rsv(blob, i);
618 			break;
619 		}
620 	}
621 
622 	/*
623 	 * Calculate the actual size of the fdt
624 	 * plus the size needed for 5 fdt_add_mem_rsv, one
625 	 * for the fdt itself and 4 for a possible initrd
626 	 * ((initrd-start + initrd-end) * 2 (name & value))
627 	 */
628 	actualsize = fdt_off_dt_strings(blob) +
629 		fdt_size_dt_strings(blob) + 5 * sizeof(struct fdt_reserve_entry);
630 
631 	actualsize += extrasize;
632 	/* Make it so the fdt ends on a page boundary */
633 	actualsize = ALIGN(actualsize + ((uintptr_t)blob & 0xfff), 0x1000);
634 	actualsize = actualsize - ((uintptr_t)blob & 0xfff);
635 
636 	/* Change the fdt header to reflect the correct size */
637 	fdt_set_totalsize(blob, actualsize);
638 
639 	/* Add the new reservation */
640 	ret = fdt_add_mem_rsv(blob, (uintptr_t)blob, actualsize);
641 	if (ret < 0)
642 		return ret;
643 
644 	return actualsize;
645 }
646 
647 #ifdef CONFIG_PCI
648 #define CONFIG_SYS_PCI_NR_INBOUND_WIN 4
649 
650 #define FDT_PCI_PREFETCH	(0x40000000)
651 #define FDT_PCI_MEM32		(0x02000000)
652 #define FDT_PCI_IO		(0x01000000)
653 #define FDT_PCI_MEM64		(0x03000000)
654 
655 int fdt_pci_dma_ranges(void *blob, int phb_off, struct pci_controller *hose) {
656 
657 	int addrcell, sizecell, len, r;
658 	u32 *dma_range;
659 	/* sized based on pci addr cells, size-cells, & address-cells */
660 	u32 dma_ranges[(3 + 2 + 2) * CONFIG_SYS_PCI_NR_INBOUND_WIN];
661 
662 	addrcell = fdt_getprop_u32_default(blob, "/", "#address-cells", 1);
663 	sizecell = fdt_getprop_u32_default(blob, "/", "#size-cells", 1);
664 
665 	dma_range = &dma_ranges[0];
666 	for (r = 0; r < hose->region_count; r++) {
667 		u64 bus_start, phys_start, size;
668 
669 		/* skip if !PCI_REGION_SYS_MEMORY */
670 		if (!(hose->regions[r].flags & PCI_REGION_SYS_MEMORY))
671 			continue;
672 
673 		bus_start = (u64)hose->regions[r].bus_start;
674 		phys_start = (u64)hose->regions[r].phys_start;
675 		size = (u64)hose->regions[r].size;
676 
677 		dma_range[0] = 0;
678 		if (size >= 0x100000000ull)
679 			dma_range[0] |= FDT_PCI_MEM64;
680 		else
681 			dma_range[0] |= FDT_PCI_MEM32;
682 		if (hose->regions[r].flags & PCI_REGION_PREFETCH)
683 			dma_range[0] |= FDT_PCI_PREFETCH;
684 #ifdef CONFIG_SYS_PCI_64BIT
685 		dma_range[1] = bus_start >> 32;
686 #else
687 		dma_range[1] = 0;
688 #endif
689 		dma_range[2] = bus_start & 0xffffffff;
690 
691 		if (addrcell == 2) {
692 			dma_range[3] = phys_start >> 32;
693 			dma_range[4] = phys_start & 0xffffffff;
694 		} else {
695 			dma_range[3] = phys_start & 0xffffffff;
696 		}
697 
698 		if (sizecell == 2) {
699 			dma_range[3 + addrcell + 0] = size >> 32;
700 			dma_range[3 + addrcell + 1] = size & 0xffffffff;
701 		} else {
702 			dma_range[3 + addrcell + 0] = size & 0xffffffff;
703 		}
704 
705 		dma_range += (3 + addrcell + sizecell);
706 	}
707 
708 	len = dma_range - &dma_ranges[0];
709 	if (len)
710 		fdt_setprop(blob, phb_off, "dma-ranges", &dma_ranges[0], len*4);
711 
712 	return 0;
713 }
714 #endif
715 
716 int fdt_increase_size(void *fdt, int add_len)
717 {
718 	int newlen;
719 
720 	newlen = fdt_totalsize(fdt) + add_len;
721 
722 	/* Open in place with a new len */
723 	return fdt_open_into(fdt, fdt, newlen);
724 }
725 
726 #ifdef CONFIG_FDT_FIXUP_PARTITIONS
727 #include <jffs2/load_kernel.h>
728 #include <mtd_node.h>
729 
730 struct reg_cell {
731 	unsigned int r0;
732 	unsigned int r1;
733 };
734 
735 int fdt_del_subnodes(const void *blob, int parent_offset)
736 {
737 	int off, ndepth;
738 	int ret;
739 
740 	for (ndepth = 0, off = fdt_next_node(blob, parent_offset, &ndepth);
741 	     (off >= 0) && (ndepth > 0);
742 	     off = fdt_next_node(blob, off, &ndepth)) {
743 		if (ndepth == 1) {
744 			debug("delete %s: offset: %x\n",
745 				fdt_get_name(blob, off, 0), off);
746 			ret = fdt_del_node((void *)blob, off);
747 			if (ret < 0) {
748 				printf("Can't delete node: %s\n",
749 					fdt_strerror(ret));
750 				return ret;
751 			} else {
752 				ndepth = 0;
753 				off = parent_offset;
754 			}
755 		}
756 	}
757 	return 0;
758 }
759 
760 int fdt_del_partitions(void *blob, int parent_offset)
761 {
762 	const void *prop;
763 	int ndepth = 0;
764 	int off;
765 	int ret;
766 
767 	off = fdt_next_node(blob, parent_offset, &ndepth);
768 	if (off > 0 && ndepth == 1) {
769 		prop = fdt_getprop(blob, off, "label", NULL);
770 		if (prop == NULL) {
771 			/*
772 			 * Could not find label property, nand {}; node?
773 			 * Check subnode, delete partitions there if any.
774 			 */
775 			return fdt_del_partitions(blob, off);
776 		} else {
777 			ret = fdt_del_subnodes(blob, parent_offset);
778 			if (ret < 0) {
779 				printf("Can't remove subnodes: %s\n",
780 					fdt_strerror(ret));
781 				return ret;
782 			}
783 		}
784 	}
785 	return 0;
786 }
787 
788 int fdt_node_set_part_info(void *blob, int parent_offset,
789 			   struct mtd_device *dev)
790 {
791 	struct list_head *pentry;
792 	struct part_info *part;
793 	struct reg_cell cell;
794 	int off, ndepth = 0;
795 	int part_num, ret;
796 	char buf[64];
797 
798 	ret = fdt_del_partitions(blob, parent_offset);
799 	if (ret < 0)
800 		return ret;
801 
802 	/*
803 	 * Check if it is nand {}; subnode, adjust
804 	 * the offset in this case
805 	 */
806 	off = fdt_next_node(blob, parent_offset, &ndepth);
807 	if (off > 0 && ndepth == 1)
808 		parent_offset = off;
809 
810 	part_num = 0;
811 	list_for_each_prev(pentry, &dev->parts) {
812 		int newoff;
813 
814 		part = list_entry(pentry, struct part_info, link);
815 
816 		debug("%2d: %-20s0x%08llx\t0x%08llx\t%d\n",
817 			part_num, part->name, part->size,
818 			part->offset, part->mask_flags);
819 
820 		sprintf(buf, "partition@%llx", part->offset);
821 add_sub:
822 		ret = fdt_add_subnode(blob, parent_offset, buf);
823 		if (ret == -FDT_ERR_NOSPACE) {
824 			ret = fdt_increase_size(blob, 512);
825 			if (!ret)
826 				goto add_sub;
827 			else
828 				goto err_size;
829 		} else if (ret < 0) {
830 			printf("Can't add partition node: %s\n",
831 				fdt_strerror(ret));
832 			return ret;
833 		}
834 		newoff = ret;
835 
836 		/* Check MTD_WRITEABLE_CMD flag */
837 		if (part->mask_flags & 1) {
838 add_ro:
839 			ret = fdt_setprop(blob, newoff, "read_only", NULL, 0);
840 			if (ret == -FDT_ERR_NOSPACE) {
841 				ret = fdt_increase_size(blob, 512);
842 				if (!ret)
843 					goto add_ro;
844 				else
845 					goto err_size;
846 			} else if (ret < 0)
847 				goto err_prop;
848 		}
849 
850 		cell.r0 = cpu_to_fdt32(part->offset);
851 		cell.r1 = cpu_to_fdt32(part->size);
852 add_reg:
853 		ret = fdt_setprop(blob, newoff, "reg", &cell, sizeof(cell));
854 		if (ret == -FDT_ERR_NOSPACE) {
855 			ret = fdt_increase_size(blob, 512);
856 			if (!ret)
857 				goto add_reg;
858 			else
859 				goto err_size;
860 		} else if (ret < 0)
861 			goto err_prop;
862 
863 add_label:
864 		ret = fdt_setprop_string(blob, newoff, "label", part->name);
865 		if (ret == -FDT_ERR_NOSPACE) {
866 			ret = fdt_increase_size(blob, 512);
867 			if (!ret)
868 				goto add_label;
869 			else
870 				goto err_size;
871 		} else if (ret < 0)
872 			goto err_prop;
873 
874 		part_num++;
875 	}
876 	return 0;
877 err_size:
878 	printf("Can't increase blob size: %s\n", fdt_strerror(ret));
879 	return ret;
880 err_prop:
881 	printf("Can't add property: %s\n", fdt_strerror(ret));
882 	return ret;
883 }
884 
885 /*
886  * Update partitions in nor/nand nodes using info from
887  * mtdparts environment variable. The nodes to update are
888  * specified by node_info structure which contains mtd device
889  * type and compatible string: E. g. the board code in
890  * ft_board_setup() could use:
891  *
892  *	struct node_info nodes[] = {
893  *		{ "fsl,mpc5121-nfc",    MTD_DEV_TYPE_NAND, },
894  *		{ "cfi-flash",          MTD_DEV_TYPE_NOR,  },
895  *	};
896  *
897  *	fdt_fixup_mtdparts(blob, nodes, ARRAY_SIZE(nodes));
898  */
899 void fdt_fixup_mtdparts(void *blob, void *node_info, int node_info_size)
900 {
901 	struct node_info *ni = node_info;
902 	struct mtd_device *dev;
903 	int i, idx;
904 	int noff;
905 
906 	if (mtdparts_init() != 0)
907 		return;
908 
909 	for (i = 0; i < node_info_size; i++) {
910 		idx = 0;
911 		noff = fdt_node_offset_by_compatible(blob, -1, ni[i].compat);
912 		while (noff != -FDT_ERR_NOTFOUND) {
913 			debug("%s: %s, mtd dev type %d\n",
914 				fdt_get_name(blob, noff, 0),
915 				ni[i].compat, ni[i].type);
916 			dev = device_find(ni[i].type, idx++);
917 			if (dev) {
918 				if (fdt_node_set_part_info(blob, noff, dev))
919 					return; /* return on error */
920 			}
921 
922 			/* Jump to next flash node */
923 			noff = fdt_node_offset_by_compatible(blob, noff,
924 							     ni[i].compat);
925 		}
926 	}
927 }
928 #endif
929 
930 void fdt_del_node_and_alias(void *blob, const char *alias)
931 {
932 	int off = fdt_path_offset(blob, alias);
933 
934 	if (off < 0)
935 		return;
936 
937 	fdt_del_node(blob, off);
938 
939 	off = fdt_path_offset(blob, "/aliases");
940 	fdt_delprop(blob, off, alias);
941 }
942 
943 /* Max address size we deal with */
944 #define OF_MAX_ADDR_CELLS	4
945 #define OF_BAD_ADDR	FDT_ADDR_T_NONE
946 #define OF_CHECK_COUNTS(na, ns)	((na) > 0 && (na) <= OF_MAX_ADDR_CELLS && \
947 			(ns) > 0)
948 
949 /* Debug utility */
950 #ifdef DEBUG
951 static void of_dump_addr(const char *s, const fdt32_t *addr, int na)
952 {
953 	printf("%s", s);
954 	while(na--)
955 		printf(" %08x", *(addr++));
956 	printf("\n");
957 }
958 #else
959 static void of_dump_addr(const char *s, const fdt32_t *addr, int na) { }
960 #endif
961 
962 /**
963  * struct of_bus - Callbacks for bus specific translators
964  * @name:	A string used to identify this bus in debug output.
965  * @addresses:	The name of the DT property from which addresses are
966  *		to be read, typically "reg".
967  * @match:	Return non-zero if the node whose parent is at
968  *		parentoffset in the FDT blob corresponds to a bus
969  *		of this type, otherwise return zero. If NULL a match
970  *		is assumed.
971  * @count_cells:Count how many cells (be32 values) a node whose parent
972  *		is at parentoffset in the FDT blob will require to
973  *		represent its address (written to *addrc) & size
974  *		(written to *sizec).
975  * @map:	Map the address addr from the address space of this
976  *		bus to that of its parent, making use of the ranges
977  *		read from DT to an array at range. na and ns are the
978  *		number of cells (be32 values) used to hold and address
979  *		or size, respectively, for this bus. pna is the number
980  *		of cells used to hold an address for the parent bus.
981  *		Returns the address in the address space of the parent
982  *		bus.
983  * @translate:	Update the value of the address cells at addr within an
984  *		FDT by adding offset to it. na specifies the number of
985  *		cells used to hold the address being translated. Returns
986  *		zero on success, non-zero on error.
987  *
988  * Each bus type will include a struct of_bus in the of_busses array,
989  * providing implementations of some or all of the functions used to
990  * match the bus & handle address translation for its children.
991  */
992 struct of_bus {
993 	const char	*name;
994 	const char	*addresses;
995 	int		(*match)(const void *blob, int parentoffset);
996 	void		(*count_cells)(const void *blob, int parentoffset,
997 				int *addrc, int *sizec);
998 	u64		(*map)(fdt32_t *addr, const fdt32_t *range,
999 				int na, int ns, int pna);
1000 	int		(*translate)(fdt32_t *addr, u64 offset, int na);
1001 };
1002 
1003 /* Default translator (generic bus) */
1004 void fdt_support_default_count_cells(const void *blob, int parentoffset,
1005 					int *addrc, int *sizec)
1006 {
1007 	const fdt32_t *prop;
1008 
1009 	if (addrc)
1010 		*addrc = fdt_address_cells(blob, parentoffset);
1011 
1012 	if (sizec) {
1013 		prop = fdt_getprop(blob, parentoffset, "#size-cells", NULL);
1014 		if (prop)
1015 			*sizec = be32_to_cpup(prop);
1016 		else
1017 			*sizec = 1;
1018 	}
1019 }
1020 
1021 static u64 of_bus_default_map(fdt32_t *addr, const fdt32_t *range,
1022 		int na, int ns, int pna)
1023 {
1024 	u64 cp, s, da;
1025 
1026 	cp = fdt_read_number(range, na);
1027 	s  = fdt_read_number(range + na + pna, ns);
1028 	da = fdt_read_number(addr, na);
1029 
1030 	debug("OF: default map, cp=%" PRIu64 ", s=%" PRIu64
1031 	      ", da=%" PRIu64 "\n", cp, s, da);
1032 
1033 	if (da < cp || da >= (cp + s))
1034 		return OF_BAD_ADDR;
1035 	return da - cp;
1036 }
1037 
1038 static int of_bus_default_translate(fdt32_t *addr, u64 offset, int na)
1039 {
1040 	u64 a = fdt_read_number(addr, na);
1041 	memset(addr, 0, na * 4);
1042 	a += offset;
1043 	if (na > 1)
1044 		addr[na - 2] = cpu_to_fdt32(a >> 32);
1045 	addr[na - 1] = cpu_to_fdt32(a & 0xffffffffu);
1046 
1047 	return 0;
1048 }
1049 
1050 #ifdef CONFIG_OF_ISA_BUS
1051 
1052 /* ISA bus translator */
1053 static int of_bus_isa_match(const void *blob, int parentoffset)
1054 {
1055 	const char *name;
1056 
1057 	name = fdt_get_name(blob, parentoffset, NULL);
1058 	if (!name)
1059 		return 0;
1060 
1061 	return !strcmp(name, "isa");
1062 }
1063 
1064 static void of_bus_isa_count_cells(const void *blob, int parentoffset,
1065 				   int *addrc, int *sizec)
1066 {
1067 	if (addrc)
1068 		*addrc = 2;
1069 	if (sizec)
1070 		*sizec = 1;
1071 }
1072 
1073 static u64 of_bus_isa_map(fdt32_t *addr, const fdt32_t *range,
1074 			  int na, int ns, int pna)
1075 {
1076 	u64 cp, s, da;
1077 
1078 	/* Check address type match */
1079 	if ((addr[0] ^ range[0]) & cpu_to_be32(1))
1080 		return OF_BAD_ADDR;
1081 
1082 	cp = fdt_read_number(range + 1, na - 1);
1083 	s  = fdt_read_number(range + na + pna, ns);
1084 	da = fdt_read_number(addr + 1, na - 1);
1085 
1086 	debug("OF: ISA map, cp=%" PRIu64 ", s=%" PRIu64
1087 	      ", da=%" PRIu64 "\n", cp, s, da);
1088 
1089 	if (da < cp || da >= (cp + s))
1090 		return OF_BAD_ADDR;
1091 	return da - cp;
1092 }
1093 
1094 static int of_bus_isa_translate(fdt32_t *addr, u64 offset, int na)
1095 {
1096 	return of_bus_default_translate(addr + 1, offset, na - 1);
1097 }
1098 
1099 #endif /* CONFIG_OF_ISA_BUS */
1100 
1101 /* Array of bus specific translators */
1102 static struct of_bus of_busses[] = {
1103 #ifdef CONFIG_OF_ISA_BUS
1104 	/* ISA */
1105 	{
1106 		.name = "isa",
1107 		.addresses = "reg",
1108 		.match = of_bus_isa_match,
1109 		.count_cells = of_bus_isa_count_cells,
1110 		.map = of_bus_isa_map,
1111 		.translate = of_bus_isa_translate,
1112 	},
1113 #endif /* CONFIG_OF_ISA_BUS */
1114 	/* Default */
1115 	{
1116 		.name = "default",
1117 		.addresses = "reg",
1118 		.count_cells = fdt_support_default_count_cells,
1119 		.map = of_bus_default_map,
1120 		.translate = of_bus_default_translate,
1121 	},
1122 };
1123 
1124 static struct of_bus *of_match_bus(const void *blob, int parentoffset)
1125 {
1126 	struct of_bus *bus;
1127 
1128 	if (ARRAY_SIZE(of_busses) == 1)
1129 		return of_busses;
1130 
1131 	for (bus = of_busses; bus; bus++) {
1132 		if (!bus->match || bus->match(blob, parentoffset))
1133 			return bus;
1134 	}
1135 
1136 	/*
1137 	 * We should always have matched the default bus at least, since
1138 	 * it has a NULL match field. If we didn't then it somehow isn't
1139 	 * in the of_busses array or something equally catastrophic has
1140 	 * gone wrong.
1141 	 */
1142 	assert(0);
1143 	return NULL;
1144 }
1145 
1146 static int of_translate_one(const void *blob, int parent, struct of_bus *bus,
1147 			    struct of_bus *pbus, fdt32_t *addr,
1148 			    int na, int ns, int pna, const char *rprop)
1149 {
1150 	const fdt32_t *ranges;
1151 	int rlen;
1152 	int rone;
1153 	u64 offset = OF_BAD_ADDR;
1154 
1155 	/* Normally, an absence of a "ranges" property means we are
1156 	 * crossing a non-translatable boundary, and thus the addresses
1157 	 * below the current not cannot be converted to CPU physical ones.
1158 	 * Unfortunately, while this is very clear in the spec, it's not
1159 	 * what Apple understood, and they do have things like /uni-n or
1160 	 * /ht nodes with no "ranges" property and a lot of perfectly
1161 	 * useable mapped devices below them. Thus we treat the absence of
1162 	 * "ranges" as equivalent to an empty "ranges" property which means
1163 	 * a 1:1 translation at that level. It's up to the caller not to try
1164 	 * to translate addresses that aren't supposed to be translated in
1165 	 * the first place. --BenH.
1166 	 */
1167 	ranges = fdt_getprop(blob, parent, rprop, &rlen);
1168 	if (ranges == NULL || rlen == 0) {
1169 		offset = fdt_read_number(addr, na);
1170 		memset(addr, 0, pna * 4);
1171 		debug("OF: no ranges, 1:1 translation\n");
1172 		goto finish;
1173 	}
1174 
1175 	debug("OF: walking ranges...\n");
1176 
1177 	/* Now walk through the ranges */
1178 	rlen /= 4;
1179 	rone = na + pna + ns;
1180 	for (; rlen >= rone; rlen -= rone, ranges += rone) {
1181 		offset = bus->map(addr, ranges, na, ns, pna);
1182 		if (offset != OF_BAD_ADDR)
1183 			break;
1184 	}
1185 	if (offset == OF_BAD_ADDR) {
1186 		debug("OF: not found !\n");
1187 		return 1;
1188 	}
1189 	memcpy(addr, ranges + na, 4 * pna);
1190 
1191  finish:
1192 	of_dump_addr("OF: parent translation for:", addr, pna);
1193 	debug("OF: with offset: %" PRIu64 "\n", offset);
1194 
1195 	/* Translate it into parent bus space */
1196 	return pbus->translate(addr, offset, pna);
1197 }
1198 
1199 /*
1200  * Translate an address from the device-tree into a CPU physical address,
1201  * this walks up the tree and applies the various bus mappings on the
1202  * way.
1203  *
1204  * Note: We consider that crossing any level with #size-cells == 0 to mean
1205  * that translation is impossible (that is we are not dealing with a value
1206  * that can be mapped to a cpu physical address). This is not really specified
1207  * that way, but this is traditionally the way IBM at least do things
1208  */
1209 static u64 __of_translate_address(const void *blob, int node_offset,
1210 				  const fdt32_t *in_addr, const char *rprop)
1211 {
1212 	int parent;
1213 	struct of_bus *bus, *pbus;
1214 	fdt32_t addr[OF_MAX_ADDR_CELLS];
1215 	int na, ns, pna, pns;
1216 	u64 result = OF_BAD_ADDR;
1217 
1218 	debug("OF: ** translation for device %s **\n",
1219 		fdt_get_name(blob, node_offset, NULL));
1220 
1221 	/* Get parent & match bus type */
1222 	parent = fdt_parent_offset(blob, node_offset);
1223 	if (parent < 0)
1224 		goto bail;
1225 	bus = of_match_bus(blob, parent);
1226 
1227 	/* Cound address cells & copy address locally */
1228 	bus->count_cells(blob, parent, &na, &ns);
1229 	if (!OF_CHECK_COUNTS(na, ns)) {
1230 		printf("%s: Bad cell count for %s\n", __FUNCTION__,
1231 		       fdt_get_name(blob, node_offset, NULL));
1232 		goto bail;
1233 	}
1234 	memcpy(addr, in_addr, na * 4);
1235 
1236 	debug("OF: bus is %s (na=%d, ns=%d) on %s\n",
1237 	    bus->name, na, ns, fdt_get_name(blob, parent, NULL));
1238 	of_dump_addr("OF: translating address:", addr, na);
1239 
1240 	/* Translate */
1241 	for (;;) {
1242 		/* Switch to parent bus */
1243 		node_offset = parent;
1244 		parent = fdt_parent_offset(blob, node_offset);
1245 
1246 		/* If root, we have finished */
1247 		if (parent < 0) {
1248 			debug("OF: reached root node\n");
1249 			result = fdt_read_number(addr, na);
1250 			break;
1251 		}
1252 
1253 		/* Get new parent bus and counts */
1254 		pbus = of_match_bus(blob, parent);
1255 		pbus->count_cells(blob, parent, &pna, &pns);
1256 		if (!OF_CHECK_COUNTS(pna, pns)) {
1257 			printf("%s: Bad cell count for %s\n", __FUNCTION__,
1258 				fdt_get_name(blob, node_offset, NULL));
1259 			break;
1260 		}
1261 
1262 		debug("OF: parent bus is %s (na=%d, ns=%d) on %s\n",
1263 		    pbus->name, pna, pns, fdt_get_name(blob, parent, NULL));
1264 
1265 		/* Apply bus translation */
1266 		if (of_translate_one(blob, node_offset, bus, pbus,
1267 					addr, na, ns, pna, rprop))
1268 			break;
1269 
1270 		/* Complete the move up one level */
1271 		na = pna;
1272 		ns = pns;
1273 		bus = pbus;
1274 
1275 		of_dump_addr("OF: one level translation:", addr, na);
1276 	}
1277  bail:
1278 
1279 	return result;
1280 }
1281 
1282 u64 fdt_translate_address(const void *blob, int node_offset,
1283 			  const fdt32_t *in_addr)
1284 {
1285 	return __of_translate_address(blob, node_offset, in_addr, "ranges");
1286 }
1287 
1288 /**
1289  * fdt_node_offset_by_compat_reg: Find a node that matches compatiable and
1290  * who's reg property matches a physical cpu address
1291  *
1292  * @blob: ptr to device tree
1293  * @compat: compatiable string to match
1294  * @compat_off: property name
1295  *
1296  */
1297 int fdt_node_offset_by_compat_reg(void *blob, const char *compat,
1298 					phys_addr_t compat_off)
1299 {
1300 	int len, off = fdt_node_offset_by_compatible(blob, -1, compat);
1301 	while (off != -FDT_ERR_NOTFOUND) {
1302 		const fdt32_t *reg = fdt_getprop(blob, off, "reg", &len);
1303 		if (reg) {
1304 			if (compat_off == fdt_translate_address(blob, off, reg))
1305 				return off;
1306 		}
1307 		off = fdt_node_offset_by_compatible(blob, off, compat);
1308 	}
1309 
1310 	return -FDT_ERR_NOTFOUND;
1311 }
1312 
1313 /**
1314  * fdt_alloc_phandle: Return next free phandle value
1315  *
1316  * @blob: ptr to device tree
1317  */
1318 int fdt_alloc_phandle(void *blob)
1319 {
1320 	int offset;
1321 	uint32_t phandle = 0;
1322 
1323 	for (offset = fdt_next_node(blob, -1, NULL); offset >= 0;
1324 	     offset = fdt_next_node(blob, offset, NULL)) {
1325 		phandle = max(phandle, fdt_get_phandle(blob, offset));
1326 	}
1327 
1328 	return phandle + 1;
1329 }
1330 
1331 /*
1332  * fdt_set_phandle: Create a phandle property for the given node
1333  *
1334  * @fdt: ptr to device tree
1335  * @nodeoffset: node to update
1336  * @phandle: phandle value to set (must be unique)
1337  */
1338 int fdt_set_phandle(void *fdt, int nodeoffset, uint32_t phandle)
1339 {
1340 	int ret;
1341 
1342 #ifdef DEBUG
1343 	int off = fdt_node_offset_by_phandle(fdt, phandle);
1344 
1345 	if ((off >= 0) && (off != nodeoffset)) {
1346 		char buf[64];
1347 
1348 		fdt_get_path(fdt, nodeoffset, buf, sizeof(buf));
1349 		printf("Trying to update node %s with phandle %u ",
1350 		       buf, phandle);
1351 
1352 		fdt_get_path(fdt, off, buf, sizeof(buf));
1353 		printf("that already exists in node %s.\n", buf);
1354 		return -FDT_ERR_BADPHANDLE;
1355 	}
1356 #endif
1357 
1358 	ret = fdt_setprop_cell(fdt, nodeoffset, "phandle", phandle);
1359 	if (ret < 0)
1360 		return ret;
1361 
1362 	/*
1363 	 * For now, also set the deprecated "linux,phandle" property, so that we
1364 	 * don't break older kernels.
1365 	 */
1366 	ret = fdt_setprop_cell(fdt, nodeoffset, "linux,phandle", phandle);
1367 
1368 	return ret;
1369 }
1370 
1371 /*
1372  * fdt_create_phandle: Create a phandle property for the given node
1373  *
1374  * @fdt: ptr to device tree
1375  * @nodeoffset: node to update
1376  */
1377 unsigned int fdt_create_phandle(void *fdt, int nodeoffset)
1378 {
1379 	/* see if there is a phandle already */
1380 	int phandle = fdt_get_phandle(fdt, nodeoffset);
1381 
1382 	/* if we got 0, means no phandle so create one */
1383 	if (phandle == 0) {
1384 		int ret;
1385 
1386 		phandle = fdt_alloc_phandle(fdt);
1387 		ret = fdt_set_phandle(fdt, nodeoffset, phandle);
1388 		if (ret < 0) {
1389 			printf("Can't set phandle %u: %s\n", phandle,
1390 			       fdt_strerror(ret));
1391 			return 0;
1392 		}
1393 	}
1394 
1395 	return phandle;
1396 }
1397 
1398 /*
1399  * fdt_set_node_status: Set status for the given node
1400  *
1401  * @fdt: ptr to device tree
1402  * @nodeoffset: node to update
1403  * @status: FDT_STATUS_OKAY, FDT_STATUS_DISABLED,
1404  *	    FDT_STATUS_FAIL, FDT_STATUS_FAIL_ERROR_CODE
1405  * @error_code: optional, only used if status is FDT_STATUS_FAIL_ERROR_CODE
1406  */
1407 int fdt_set_node_status(void *fdt, int nodeoffset,
1408 			enum fdt_status status, unsigned int error_code)
1409 {
1410 	char buf[16];
1411 	int ret = 0;
1412 
1413 	if (nodeoffset < 0)
1414 		return nodeoffset;
1415 
1416 	switch (status) {
1417 	case FDT_STATUS_OKAY:
1418 		ret = fdt_setprop_string(fdt, nodeoffset, "status", "okay");
1419 		break;
1420 	case FDT_STATUS_DISABLED:
1421 		ret = fdt_setprop_string(fdt, nodeoffset, "status", "disabled");
1422 		break;
1423 	case FDT_STATUS_FAIL:
1424 		ret = fdt_setprop_string(fdt, nodeoffset, "status", "fail");
1425 		break;
1426 	case FDT_STATUS_FAIL_ERROR_CODE:
1427 		sprintf(buf, "fail-%d", error_code);
1428 		ret = fdt_setprop_string(fdt, nodeoffset, "status", buf);
1429 		break;
1430 	default:
1431 		printf("Invalid fdt status: %x\n", status);
1432 		ret = -1;
1433 		break;
1434 	}
1435 
1436 	return ret;
1437 }
1438 
1439 /*
1440  * fdt_set_status_by_alias: Set status for the given node given an alias
1441  *
1442  * @fdt: ptr to device tree
1443  * @alias: alias of node to update
1444  * @status: FDT_STATUS_OKAY, FDT_STATUS_DISABLED,
1445  *	    FDT_STATUS_FAIL, FDT_STATUS_FAIL_ERROR_CODE
1446  * @error_code: optional, only used if status is FDT_STATUS_FAIL_ERROR_CODE
1447  */
1448 int fdt_set_status_by_alias(void *fdt, const char* alias,
1449 			    enum fdt_status status, unsigned int error_code)
1450 {
1451 	int offset = fdt_path_offset(fdt, alias);
1452 
1453 	return fdt_set_node_status(fdt, offset, status, error_code);
1454 }
1455 
1456 #if defined(CONFIG_VIDEO) || defined(CONFIG_LCD)
1457 int fdt_add_edid(void *blob, const char *compat, unsigned char *edid_buf)
1458 {
1459 	int noff;
1460 	int ret;
1461 
1462 	noff = fdt_node_offset_by_compatible(blob, -1, compat);
1463 	if (noff != -FDT_ERR_NOTFOUND) {
1464 		debug("%s: %s\n", fdt_get_name(blob, noff, 0), compat);
1465 add_edid:
1466 		ret = fdt_setprop(blob, noff, "edid", edid_buf, 128);
1467 		if (ret == -FDT_ERR_NOSPACE) {
1468 			ret = fdt_increase_size(blob, 512);
1469 			if (!ret)
1470 				goto add_edid;
1471 			else
1472 				goto err_size;
1473 		} else if (ret < 0) {
1474 			printf("Can't add property: %s\n", fdt_strerror(ret));
1475 			return ret;
1476 		}
1477 	}
1478 	return 0;
1479 err_size:
1480 	printf("Can't increase blob size: %s\n", fdt_strerror(ret));
1481 	return ret;
1482 }
1483 #endif
1484 
1485 /*
1486  * Verify the physical address of device tree node for a given alias
1487  *
1488  * This function locates the device tree node of a given alias, and then
1489  * verifies that the physical address of that device matches the given
1490  * parameter.  It displays a message if there is a mismatch.
1491  *
1492  * Returns 1 on success, 0 on failure
1493  */
1494 int fdt_verify_alias_address(void *fdt, int anode, const char *alias, u64 addr)
1495 {
1496 	const char *path;
1497 	const fdt32_t *reg;
1498 	int node, len;
1499 	u64 dt_addr;
1500 
1501 	path = fdt_getprop(fdt, anode, alias, NULL);
1502 	if (!path) {
1503 		/* If there's no such alias, then it's not a failure */
1504 		return 1;
1505 	}
1506 
1507 	node = fdt_path_offset(fdt, path);
1508 	if (node < 0) {
1509 		printf("Warning: device tree alias '%s' points to invalid "
1510 		       "node %s.\n", alias, path);
1511 		return 0;
1512 	}
1513 
1514 	reg = fdt_getprop(fdt, node, "reg", &len);
1515 	if (!reg) {
1516 		printf("Warning: device tree node '%s' has no address.\n",
1517 		       path);
1518 		return 0;
1519 	}
1520 
1521 	dt_addr = fdt_translate_address(fdt, node, reg);
1522 	if (addr != dt_addr) {
1523 		printf("Warning: U-Boot configured device %s at address %"
1524 		       PRIx64 ",\n but the device tree has it address %"
1525 		       PRIx64 ".\n", alias, addr, dt_addr);
1526 		return 0;
1527 	}
1528 
1529 	return 1;
1530 }
1531 
1532 /*
1533  * Returns the base address of an SOC or PCI node
1534  */
1535 u64 fdt_get_base_address(const void *fdt, int node)
1536 {
1537 	int size;
1538 	const fdt32_t *prop;
1539 
1540 	prop = fdt_getprop(fdt, node, "reg", &size);
1541 
1542 	return prop ? fdt_translate_address(fdt, node, prop) : 0;
1543 }
1544 
1545 /*
1546  * Read a property of size <prop_len>. Currently only supports 1 or 2 cells.
1547  */
1548 static int fdt_read_prop(const fdt32_t *prop, int prop_len, int cell_off,
1549 			 uint64_t *val, int cells)
1550 {
1551 	const fdt32_t *prop32 = &prop[cell_off];
1552 	const fdt64_t *prop64 = (const fdt64_t *)&prop[cell_off];
1553 
1554 	if ((cell_off + cells) > prop_len)
1555 		return -FDT_ERR_NOSPACE;
1556 
1557 	switch (cells) {
1558 	case 1:
1559 		*val = fdt32_to_cpu(*prop32);
1560 		break;
1561 	case 2:
1562 		*val = fdt64_to_cpu(*prop64);
1563 		break;
1564 	default:
1565 		return -FDT_ERR_NOSPACE;
1566 	}
1567 
1568 	return 0;
1569 }
1570 
1571 /**
1572  * fdt_read_range - Read a node's n'th range property
1573  *
1574  * @fdt: ptr to device tree
1575  * @node: offset of node
1576  * @n: range index
1577  * @child_addr: pointer to storage for the "child address" field
1578  * @addr: pointer to storage for the CPU view translated physical start
1579  * @len: pointer to storage for the range length
1580  *
1581  * Convenience function that reads and interprets a specific range out of
1582  * a number of the "ranges" property array.
1583  */
1584 int fdt_read_range(void *fdt, int node, int n, uint64_t *child_addr,
1585 		   uint64_t *addr, uint64_t *len)
1586 {
1587 	int pnode = fdt_parent_offset(fdt, node);
1588 	const fdt32_t *ranges;
1589 	int pacells;
1590 	int acells;
1591 	int scells;
1592 	int ranges_len;
1593 	int cell = 0;
1594 	int r = 0;
1595 
1596 	/*
1597 	 * The "ranges" property is an array of
1598 	 * { <child address> <parent address> <size in child address space> }
1599 	 *
1600 	 * All 3 elements can span a diffent number of cells. Fetch their size.
1601 	 */
1602 	pacells = fdt_getprop_u32_default_node(fdt, pnode, 0, "#address-cells", 1);
1603 	acells = fdt_getprop_u32_default_node(fdt, node, 0, "#address-cells", 1);
1604 	scells = fdt_getprop_u32_default_node(fdt, node, 0, "#size-cells", 1);
1605 
1606 	/* Now try to get the ranges property */
1607 	ranges = fdt_getprop(fdt, node, "ranges", &ranges_len);
1608 	if (!ranges)
1609 		return -FDT_ERR_NOTFOUND;
1610 	ranges_len /= sizeof(uint32_t);
1611 
1612 	/* Jump to the n'th entry */
1613 	cell = n * (pacells + acells + scells);
1614 
1615 	/* Read <child address> */
1616 	if (child_addr) {
1617 		r = fdt_read_prop(ranges, ranges_len, cell, child_addr,
1618 				  acells);
1619 		if (r)
1620 			return r;
1621 	}
1622 	cell += acells;
1623 
1624 	/* Read <parent address> */
1625 	if (addr)
1626 		*addr = fdt_translate_address(fdt, node, ranges + cell);
1627 	cell += pacells;
1628 
1629 	/* Read <size in child address space> */
1630 	if (len) {
1631 		r = fdt_read_prop(ranges, ranges_len, cell, len, scells);
1632 		if (r)
1633 			return r;
1634 	}
1635 
1636 	return 0;
1637 }
1638 
1639 /**
1640  * fdt_setup_simplefb_node - Fill and enable a simplefb node
1641  *
1642  * @fdt: ptr to device tree
1643  * @node: offset of the simplefb node
1644  * @base_address: framebuffer base address
1645  * @width: width in pixels
1646  * @height: height in pixels
1647  * @stride: bytes per line
1648  * @format: pixel format string
1649  *
1650  * Convenience function to fill and enable a simplefb node.
1651  */
1652 int fdt_setup_simplefb_node(void *fdt, int node, u64 base_address, u32 width,
1653 			    u32 height, u32 stride, const char *format)
1654 {
1655 	char name[32];
1656 	fdt32_t cells[4];
1657 	int i, addrc, sizec, ret;
1658 
1659 	fdt_support_default_count_cells(fdt, fdt_parent_offset(fdt, node),
1660 					&addrc, &sizec);
1661 	i = 0;
1662 	if (addrc == 2)
1663 		cells[i++] = cpu_to_fdt32(base_address >> 32);
1664 	cells[i++] = cpu_to_fdt32(base_address);
1665 	if (sizec == 2)
1666 		cells[i++] = 0;
1667 	cells[i++] = cpu_to_fdt32(height * stride);
1668 
1669 	ret = fdt_setprop(fdt, node, "reg", cells, sizeof(cells[0]) * i);
1670 	if (ret < 0)
1671 		return ret;
1672 
1673 	snprintf(name, sizeof(name), "framebuffer@%" PRIx64, base_address);
1674 	ret = fdt_set_name(fdt, node, name);
1675 	if (ret < 0)
1676 		return ret;
1677 
1678 	ret = fdt_setprop_u32(fdt, node, "width", width);
1679 	if (ret < 0)
1680 		return ret;
1681 
1682 	ret = fdt_setprop_u32(fdt, node, "height", height);
1683 	if (ret < 0)
1684 		return ret;
1685 
1686 	ret = fdt_setprop_u32(fdt, node, "stride", stride);
1687 	if (ret < 0)
1688 		return ret;
1689 
1690 	ret = fdt_setprop_string(fdt, node, "format", format);
1691 	if (ret < 0)
1692 		return ret;
1693 
1694 	ret = fdt_setprop_string(fdt, node, "status", "okay");
1695 	if (ret < 0)
1696 		return ret;
1697 
1698 	return 0;
1699 }
1700 
1701 /*
1702  * Update native-mode in display-timings from display environment variable.
1703  * The node to update are specified by path.
1704  */
1705 int fdt_fixup_display(void *blob, const char *path, const char *display)
1706 {
1707 	int off, toff;
1708 
1709 	if (!display || !path)
1710 		return -FDT_ERR_NOTFOUND;
1711 
1712 	toff = fdt_path_offset(blob, path);
1713 	if (toff >= 0)
1714 		toff = fdt_subnode_offset(blob, toff, "display-timings");
1715 	if (toff < 0)
1716 		return toff;
1717 
1718 	for (off = fdt_first_subnode(blob, toff);
1719 	     off >= 0;
1720 	     off = fdt_next_subnode(blob, off)) {
1721 		uint32_t h = fdt_get_phandle(blob, off);
1722 		debug("%s:0x%x\n", fdt_get_name(blob, off, NULL),
1723 		      fdt32_to_cpu(h));
1724 		if (strcasecmp(fdt_get_name(blob, off, NULL), display) == 0)
1725 			return fdt_setprop_u32(blob, toff, "native-mode", h);
1726 	}
1727 	return toff;
1728 }
1729 
1730 #ifdef CONFIG_OF_LIBFDT_OVERLAY
1731 /**
1732  * fdt_overlay_apply_verbose - Apply an overlay with verbose error reporting
1733  *
1734  * @fdt: ptr to device tree
1735  * @fdto: ptr to device tree overlay
1736  *
1737  * Convenience function to apply an overlay and display helpful messages
1738  * in the case of an error
1739  */
1740 int fdt_overlay_apply_verbose(void *fdt, void *fdto)
1741 {
1742 	int err;
1743 	bool has_symbols;
1744 
1745 	err = fdt_path_offset(fdt, "/__symbols__");
1746 	has_symbols = err >= 0;
1747 
1748 	err = fdt_overlay_apply(fdt, fdto);
1749 	if (err < 0) {
1750 		printf("failed on fdt_overlay_apply(): %s\n",
1751 				fdt_strerror(err));
1752 		if (!has_symbols) {
1753 			printf("base fdt does did not have a /__symbols__ node\n");
1754 			printf("make sure you've compiled with -@\n");
1755 		}
1756 	}
1757 	return err;
1758 }
1759 #endif
1760