xref: /openbmc/u-boot/common/fdt_support.c (revision 77c07e7e)
1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3  * (C) Copyright 2007
4  * Gerald Van Baren, Custom IDEAS, vanbaren@cideas.com
5  *
6  * Copyright 2010-2011 Freescale Semiconductor, Inc.
7  */
8 
9 #include <common.h>
10 #include <mapmem.h>
11 #include <stdio_dev.h>
12 #include <linux/ctype.h>
13 #include <linux/types.h>
14 #include <asm/global_data.h>
15 #include <linux/libfdt.h>
16 #include <fdt_support.h>
17 #include <exports.h>
18 #include <fdtdec.h>
19 
20 /**
21  * fdt_getprop_u32_default_node - Return a node's property or a default
22  *
23  * @fdt: ptr to device tree
24  * @off: offset of node
25  * @cell: cell offset in property
26  * @prop: property name
27  * @dflt: default value if the property isn't found
28  *
29  * Convenience function to return a node's property or a default value if
30  * the property doesn't exist.
31  */
fdt_getprop_u32_default_node(const void * fdt,int off,int cell,const char * prop,const u32 dflt)32 u32 fdt_getprop_u32_default_node(const void *fdt, int off, int cell,
33 				const char *prop, const u32 dflt)
34 {
35 	const fdt32_t *val;
36 	int len;
37 
38 	val = fdt_getprop(fdt, off, prop, &len);
39 
40 	/* Check if property exists */
41 	if (!val)
42 		return dflt;
43 
44 	/* Check if property is long enough */
45 	if (len < ((cell + 1) * sizeof(uint32_t)))
46 		return dflt;
47 
48 	return fdt32_to_cpu(*val);
49 }
50 
51 /**
52  * fdt_getprop_u32_default - Find a node and return it's property or a default
53  *
54  * @fdt: ptr to device tree
55  * @path: path of node
56  * @prop: property name
57  * @dflt: default value if the property isn't found
58  *
59  * Convenience function to find a node and return it's property or a
60  * default value if it doesn't exist.
61  */
fdt_getprop_u32_default(const void * fdt,const char * path,const char * prop,const u32 dflt)62 u32 fdt_getprop_u32_default(const void *fdt, const char *path,
63 				const char *prop, const u32 dflt)
64 {
65 	int off;
66 
67 	off = fdt_path_offset(fdt, path);
68 	if (off < 0)
69 		return dflt;
70 
71 	return fdt_getprop_u32_default_node(fdt, off, 0, prop, dflt);
72 }
73 
74 /**
75  * fdt_find_and_setprop: Find a node and set it's property
76  *
77  * @fdt: ptr to device tree
78  * @node: path of node
79  * @prop: property name
80  * @val: ptr to new value
81  * @len: length of new property value
82  * @create: flag to create the property if it doesn't exist
83  *
84  * Convenience function to directly set a property given the path to the node.
85  */
fdt_find_and_setprop(void * fdt,const char * node,const char * prop,const void * val,int len,int create)86 int fdt_find_and_setprop(void *fdt, const char *node, const char *prop,
87 			 const void *val, int len, int create)
88 {
89 	int nodeoff = fdt_path_offset(fdt, node);
90 
91 	if (nodeoff < 0)
92 		return nodeoff;
93 
94 	if ((!create) && (fdt_get_property(fdt, nodeoff, prop, NULL) == NULL))
95 		return 0; /* create flag not set; so exit quietly */
96 
97 	return fdt_setprop(fdt, nodeoff, prop, val, len);
98 }
99 
100 /**
101  * fdt_find_or_add_subnode() - find or possibly add a subnode of a given node
102  *
103  * @fdt: pointer to the device tree blob
104  * @parentoffset: structure block offset of a node
105  * @name: name of the subnode to locate
106  *
107  * fdt_subnode_offset() finds a subnode of the node with a given name.
108  * If the subnode does not exist, it will be created.
109  */
fdt_find_or_add_subnode(void * fdt,int parentoffset,const char * name)110 int fdt_find_or_add_subnode(void *fdt, int parentoffset, const char *name)
111 {
112 	int offset;
113 
114 	offset = fdt_subnode_offset(fdt, parentoffset, name);
115 
116 	if (offset == -FDT_ERR_NOTFOUND)
117 		offset = fdt_add_subnode(fdt, parentoffset, name);
118 
119 	if (offset < 0)
120 		printf("%s: %s: %s\n", __func__, name, fdt_strerror(offset));
121 
122 	return offset;
123 }
124 
125 /* rename to CONFIG_OF_STDOUT_PATH ? */
126 #if defined(OF_STDOUT_PATH)
fdt_fixup_stdout(void * fdt,int chosenoff)127 static int fdt_fixup_stdout(void *fdt, int chosenoff)
128 {
129 	return fdt_setprop(fdt, chosenoff, "linux,stdout-path",
130 			      OF_STDOUT_PATH, strlen(OF_STDOUT_PATH) + 1);
131 }
132 #elif defined(CONFIG_OF_STDOUT_VIA_ALIAS) && defined(CONFIG_CONS_INDEX)
fdt_fixup_stdout(void * fdt,int chosenoff)133 static int fdt_fixup_stdout(void *fdt, int chosenoff)
134 {
135 	int err;
136 	int aliasoff;
137 	char sername[9] = { 0 };
138 	const void *path;
139 	int len;
140 	char tmp[256]; /* long enough */
141 
142 	sprintf(sername, "serial%d", CONFIG_CONS_INDEX - 1);
143 
144 	aliasoff = fdt_path_offset(fdt, "/aliases");
145 	if (aliasoff < 0) {
146 		err = aliasoff;
147 		goto noalias;
148 	}
149 
150 	path = fdt_getprop(fdt, aliasoff, sername, &len);
151 	if (!path) {
152 		err = len;
153 		goto noalias;
154 	}
155 
156 	/* fdt_setprop may break "path" so we copy it to tmp buffer */
157 	memcpy(tmp, path, len);
158 
159 	err = fdt_setprop(fdt, chosenoff, "linux,stdout-path", tmp, len);
160 	if (err < 0)
161 		printf("WARNING: could not set linux,stdout-path %s.\n",
162 		       fdt_strerror(err));
163 
164 	return err;
165 
166 noalias:
167 	printf("WARNING: %s: could not read %s alias: %s\n",
168 	       __func__, sername, fdt_strerror(err));
169 
170 	return 0;
171 }
172 #else
fdt_fixup_stdout(void * fdt,int chosenoff)173 static int fdt_fixup_stdout(void *fdt, int chosenoff)
174 {
175 	return 0;
176 }
177 #endif
178 
fdt_setprop_uxx(void * fdt,int nodeoffset,const char * name,uint64_t val,int is_u64)179 static inline int fdt_setprop_uxx(void *fdt, int nodeoffset, const char *name,
180 				  uint64_t val, int is_u64)
181 {
182 	if (is_u64)
183 		return fdt_setprop_u64(fdt, nodeoffset, name, val);
184 	else
185 		return fdt_setprop_u32(fdt, nodeoffset, name, (uint32_t)val);
186 }
187 
fdt_root(void * fdt)188 int fdt_root(void *fdt)
189 {
190 	char *serial;
191 	int err;
192 
193 	err = fdt_check_header(fdt);
194 	if (err < 0) {
195 		printf("fdt_root: %s\n", fdt_strerror(err));
196 		return err;
197 	}
198 
199 	serial = env_get("serial#");
200 	if (serial) {
201 		err = fdt_setprop(fdt, 0, "serial-number", serial,
202 				  strlen(serial) + 1);
203 
204 		if (err < 0) {
205 			printf("WARNING: could not set serial-number %s.\n",
206 			       fdt_strerror(err));
207 			return err;
208 		}
209 	}
210 
211 	return 0;
212 }
213 
fdt_initrd(void * fdt,ulong initrd_start,ulong initrd_end)214 int fdt_initrd(void *fdt, ulong initrd_start, ulong initrd_end)
215 {
216 	int   nodeoffset;
217 	int   err, j, total;
218 	int is_u64;
219 	uint64_t addr, size;
220 
221 	/* just return if the size of initrd is zero */
222 	if (initrd_start == initrd_end)
223 		return 0;
224 
225 	/* find or create "/chosen" node. */
226 	nodeoffset = fdt_find_or_add_subnode(fdt, 0, "chosen");
227 	if (nodeoffset < 0)
228 		return nodeoffset;
229 
230 	total = fdt_num_mem_rsv(fdt);
231 
232 	/*
233 	 * Look for an existing entry and update it.  If we don't find
234 	 * the entry, we will j be the next available slot.
235 	 */
236 	for (j = 0; j < total; j++) {
237 		err = fdt_get_mem_rsv(fdt, j, &addr, &size);
238 		if (addr == initrd_start) {
239 			fdt_del_mem_rsv(fdt, j);
240 			break;
241 		}
242 	}
243 
244 	err = fdt_add_mem_rsv(fdt, initrd_start, initrd_end - initrd_start);
245 	if (err < 0) {
246 		printf("fdt_initrd: %s\n", fdt_strerror(err));
247 		return err;
248 	}
249 
250 	is_u64 = (fdt_address_cells(fdt, 0) == 2);
251 
252 	err = fdt_setprop_uxx(fdt, nodeoffset, "linux,initrd-start",
253 			      (uint64_t)initrd_start, is_u64);
254 
255 	if (err < 0) {
256 		printf("WARNING: could not set linux,initrd-start %s.\n",
257 		       fdt_strerror(err));
258 		return err;
259 	}
260 
261 	err = fdt_setprop_uxx(fdt, nodeoffset, "linux,initrd-end",
262 			      (uint64_t)initrd_end, is_u64);
263 
264 	if (err < 0) {
265 		printf("WARNING: could not set linux,initrd-end %s.\n",
266 		       fdt_strerror(err));
267 
268 		return err;
269 	}
270 
271 	return 0;
272 }
273 
fdt_chosen(void * fdt)274 int fdt_chosen(void *fdt)
275 {
276 	int   nodeoffset;
277 	int   err;
278 	char  *str;		/* used to set string properties */
279 
280 	err = fdt_check_header(fdt);
281 	if (err < 0) {
282 		printf("fdt_chosen: %s\n", fdt_strerror(err));
283 		return err;
284 	}
285 
286 	/* find or create "/chosen" node. */
287 	nodeoffset = fdt_find_or_add_subnode(fdt, 0, "chosen");
288 	if (nodeoffset < 0)
289 		return nodeoffset;
290 
291 	str = env_get("bootargs");
292 	if (str) {
293 		err = fdt_setprop(fdt, nodeoffset, "bootargs", str,
294 				  strlen(str) + 1);
295 		if (err < 0) {
296 			printf("WARNING: could not set bootargs %s.\n",
297 			       fdt_strerror(err));
298 			return err;
299 		}
300 	}
301 
302 	return fdt_fixup_stdout(fdt, nodeoffset);
303 }
304 
do_fixup_by_path(void * fdt,const char * path,const char * prop,const void * val,int len,int create)305 void do_fixup_by_path(void *fdt, const char *path, const char *prop,
306 		      const void *val, int len, int create)
307 {
308 #if defined(DEBUG)
309 	int i;
310 	debug("Updating property '%s/%s' = ", path, prop);
311 	for (i = 0; i < len; i++)
312 		debug(" %.2x", *(u8*)(val+i));
313 	debug("\n");
314 #endif
315 	int rc = fdt_find_and_setprop(fdt, path, prop, val, len, create);
316 	if (rc)
317 		printf("Unable to update property %s:%s, err=%s\n",
318 			path, prop, fdt_strerror(rc));
319 }
320 
do_fixup_by_path_u32(void * fdt,const char * path,const char * prop,u32 val,int create)321 void do_fixup_by_path_u32(void *fdt, const char *path, const char *prop,
322 			  u32 val, int create)
323 {
324 	fdt32_t tmp = cpu_to_fdt32(val);
325 	do_fixup_by_path(fdt, path, prop, &tmp, sizeof(tmp), create);
326 }
327 
do_fixup_by_prop(void * fdt,const char * pname,const void * pval,int plen,const char * prop,const void * val,int len,int create)328 void do_fixup_by_prop(void *fdt,
329 		      const char *pname, const void *pval, int plen,
330 		      const char *prop, const void *val, int len,
331 		      int create)
332 {
333 	int off;
334 #if defined(DEBUG)
335 	int i;
336 	debug("Updating property '%s' = ", prop);
337 	for (i = 0; i < len; i++)
338 		debug(" %.2x", *(u8*)(val+i));
339 	debug("\n");
340 #endif
341 	off = fdt_node_offset_by_prop_value(fdt, -1, pname, pval, plen);
342 	while (off != -FDT_ERR_NOTFOUND) {
343 		if (create || (fdt_get_property(fdt, off, prop, NULL) != NULL))
344 			fdt_setprop(fdt, off, prop, val, len);
345 		off = fdt_node_offset_by_prop_value(fdt, off, pname, pval, plen);
346 	}
347 }
348 
do_fixup_by_prop_u32(void * fdt,const char * pname,const void * pval,int plen,const char * prop,u32 val,int create)349 void do_fixup_by_prop_u32(void *fdt,
350 			  const char *pname, const void *pval, int plen,
351 			  const char *prop, u32 val, int create)
352 {
353 	fdt32_t tmp = cpu_to_fdt32(val);
354 	do_fixup_by_prop(fdt, pname, pval, plen, prop, &tmp, 4, create);
355 }
356 
do_fixup_by_compat(void * fdt,const char * compat,const char * prop,const void * val,int len,int create)357 void do_fixup_by_compat(void *fdt, const char *compat,
358 			const char *prop, const void *val, int len, int create)
359 {
360 	int off = -1;
361 #if defined(DEBUG)
362 	int i;
363 	debug("Updating property '%s' = ", prop);
364 	for (i = 0; i < len; i++)
365 		debug(" %.2x", *(u8*)(val+i));
366 	debug("\n");
367 #endif
368 	off = fdt_node_offset_by_compatible(fdt, -1, compat);
369 	while (off != -FDT_ERR_NOTFOUND) {
370 		if (create || (fdt_get_property(fdt, off, prop, NULL) != NULL))
371 			fdt_setprop(fdt, off, prop, val, len);
372 		off = fdt_node_offset_by_compatible(fdt, off, compat);
373 	}
374 }
375 
do_fixup_by_compat_u32(void * fdt,const char * compat,const char * prop,u32 val,int create)376 void do_fixup_by_compat_u32(void *fdt, const char *compat,
377 			    const char *prop, u32 val, int create)
378 {
379 	fdt32_t tmp = cpu_to_fdt32(val);
380 	do_fixup_by_compat(fdt, compat, prop, &tmp, 4, create);
381 }
382 
383 #ifdef CONFIG_ARCH_FIXUP_FDT_MEMORY
384 /*
385  * fdt_pack_reg - pack address and size array into the "reg"-suitable stream
386  */
fdt_pack_reg(const void * fdt,void * buf,u64 * address,u64 * size,int n)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 #if CONFIG_NR_DRAM_BANKS > 4
413 #define MEMORY_BANKS_MAX CONFIG_NR_DRAM_BANKS
414 #else
415 #define MEMORY_BANKS_MAX 4
416 #endif
fdt_fixup_memory_banks(void * blob,u64 start[],u64 size[],int banks)417 int fdt_fixup_memory_banks(void *blob, u64 start[], u64 size[], int banks)
418 {
419 	int err, nodeoffset;
420 	int len, i;
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 	for (i = 0; i < banks; i++) {
450 		if (start[i] == 0 && size[i] == 0)
451 			break;
452 	}
453 
454 	banks = i;
455 
456 	if (!banks)
457 		return 0;
458 
459 	for (i = 0; i < banks; i++)
460 		if (start[i] == 0 && size[i] == 0)
461 			break;
462 
463 	banks = i;
464 
465 	len = fdt_pack_reg(blob, tmp, start, size, banks);
466 
467 	err = fdt_setprop(blob, nodeoffset, "reg", tmp, len);
468 	if (err < 0) {
469 		printf("WARNING: could not set %s %s.\n",
470 				"reg", fdt_strerror(err));
471 		return err;
472 	}
473 	return 0;
474 }
475 #endif
476 
fdt_fixup_memory(void * blob,u64 start,u64 size)477 int fdt_fixup_memory(void *blob, u64 start, u64 size)
478 {
479 	return fdt_fixup_memory_banks(blob, &start, &size, 1);
480 }
481 
fdt_fixup_ethernet(void * fdt)482 void fdt_fixup_ethernet(void *fdt)
483 {
484 	int i = 0, j, prop;
485 	char *tmp, *end;
486 	char mac[16];
487 	const char *path;
488 	unsigned char mac_addr[ARP_HLEN];
489 	int offset;
490 #ifdef FDT_SEQ_MACADDR_FROM_ENV
491 	int nodeoff;
492 	const struct fdt_property *fdt_prop;
493 #endif
494 
495 	if (fdt_path_offset(fdt, "/aliases") < 0)
496 		return;
497 
498 	/* Cycle through all aliases */
499 	for (prop = 0; ; prop++) {
500 		const char *name;
501 
502 		/* FDT might have been edited, recompute the offset */
503 		offset = fdt_first_property_offset(fdt,
504 			fdt_path_offset(fdt, "/aliases"));
505 		/* Select property number 'prop' */
506 		for (j = 0; j < prop; j++)
507 			offset = fdt_next_property_offset(fdt, offset);
508 
509 		if (offset < 0)
510 			break;
511 
512 		path = fdt_getprop_by_offset(fdt, offset, &name, NULL);
513 		if (!strncmp(name, "ethernet", 8)) {
514 			/* Treat plain "ethernet" same as "ethernet0". */
515 			if (!strcmp(name, "ethernet")
516 #ifdef FDT_SEQ_MACADDR_FROM_ENV
517 			 || !strcmp(name, "ethernet0")
518 #endif
519 			)
520 				i = 0;
521 #ifndef FDT_SEQ_MACADDR_FROM_ENV
522 			else
523 				i = trailing_strtol(name);
524 #endif
525 			if (i != -1) {
526 				if (i == 0)
527 					strcpy(mac, "ethaddr");
528 				else
529 					sprintf(mac, "eth%daddr", i);
530 			} else {
531 				continue;
532 			}
533 #ifdef FDT_SEQ_MACADDR_FROM_ENV
534 			nodeoff = fdt_path_offset(fdt, path);
535 			fdt_prop = fdt_get_property(fdt, nodeoff, "status",
536 						    NULL);
537 			if (fdt_prop && !strcmp(fdt_prop->data, "disabled"))
538 				continue;
539 			i++;
540 #endif
541 			tmp = env_get(mac);
542 			if (!tmp)
543 				continue;
544 
545 			for (j = 0; j < 6; j++) {
546 				mac_addr[j] = tmp ?
547 					      simple_strtoul(tmp, &end, 16) : 0;
548 				if (tmp)
549 					tmp = (*end) ? end + 1 : end;
550 			}
551 
552 			do_fixup_by_path(fdt, path, "mac-address",
553 					 &mac_addr, 6, 0);
554 			do_fixup_by_path(fdt, path, "local-mac-address",
555 					 &mac_addr, 6, 1);
556 		}
557 	}
558 }
559 
fdt_record_loadable(void * blob,u32 index,const char * name,uintptr_t load_addr,u32 size,uintptr_t entry_point,const char * type,const char * os)560 int fdt_record_loadable(void *blob, u32 index, const char *name,
561 			uintptr_t load_addr, u32 size, uintptr_t entry_point,
562 			const char *type, const char *os)
563 {
564 	int err, node;
565 
566 	err = fdt_check_header(blob);
567 	if (err < 0) {
568 		printf("%s: %s\n", __func__, fdt_strerror(err));
569 		return err;
570 	}
571 
572 	/* find or create "/fit-images" node */
573 	node = fdt_find_or_add_subnode(blob, 0, "fit-images");
574 	if (node < 0)
575 		return node;
576 
577 	/* find or create "/fit-images/<name>" node */
578 	node = fdt_find_or_add_subnode(blob, node, name);
579 	if (node < 0)
580 		return node;
581 
582 	/*
583 	 * We record these as 32bit entities, possibly truncating addresses.
584 	 * However, spl_fit.c is not 64bit safe either: i.e. we should not
585 	 * have an issue here.
586 	 */
587 	fdt_setprop_u32(blob, node, "load-addr", load_addr);
588 	if (entry_point != -1)
589 		fdt_setprop_u32(blob, node, "entry-point", entry_point);
590 	fdt_setprop_u32(blob, node, "size", size);
591 	if (type)
592 		fdt_setprop_string(blob, node, "type", type);
593 	if (os)
594 		fdt_setprop_string(blob, node, "os", os);
595 
596 	return node;
597 }
598 
599 /* Resize the fdt to its actual size + a bit of padding */
fdt_shrink_to_minimum(void * blob,uint extrasize)600 int fdt_shrink_to_minimum(void *blob, uint extrasize)
601 {
602 	int i;
603 	uint64_t addr, size;
604 	int total, ret;
605 	uint actualsize;
606 
607 	if (!blob)
608 		return 0;
609 
610 	total = fdt_num_mem_rsv(blob);
611 	for (i = 0; i < total; i++) {
612 		fdt_get_mem_rsv(blob, i, &addr, &size);
613 		if (addr == (uintptr_t)blob) {
614 			fdt_del_mem_rsv(blob, i);
615 			break;
616 		}
617 	}
618 
619 	/*
620 	 * Calculate the actual size of the fdt
621 	 * plus the size needed for 5 fdt_add_mem_rsv, one
622 	 * for the fdt itself and 4 for a possible initrd
623 	 * ((initrd-start + initrd-end) * 2 (name & value))
624 	 */
625 	actualsize = fdt_off_dt_strings(blob) +
626 		fdt_size_dt_strings(blob) + 5 * sizeof(struct fdt_reserve_entry);
627 
628 	actualsize += extrasize;
629 	/* Make it so the fdt ends on a page boundary */
630 	actualsize = ALIGN(actualsize + ((uintptr_t)blob & 0xfff), 0x1000);
631 	actualsize = actualsize - ((uintptr_t)blob & 0xfff);
632 
633 	/* Change the fdt header to reflect the correct size */
634 	fdt_set_totalsize(blob, actualsize);
635 
636 	/* Add the new reservation */
637 	ret = fdt_add_mem_rsv(blob, map_to_sysmem(blob), actualsize);
638 	if (ret < 0)
639 		return ret;
640 
641 	return actualsize;
642 }
643 
644 #ifdef CONFIG_PCI
645 #define CONFIG_SYS_PCI_NR_INBOUND_WIN 4
646 
647 #define FDT_PCI_PREFETCH	(0x40000000)
648 #define FDT_PCI_MEM32		(0x02000000)
649 #define FDT_PCI_IO		(0x01000000)
650 #define FDT_PCI_MEM64		(0x03000000)
651 
fdt_pci_dma_ranges(void * blob,int phb_off,struct pci_controller * hose)652 int fdt_pci_dma_ranges(void *blob, int phb_off, struct pci_controller *hose) {
653 
654 	int addrcell, sizecell, len, r;
655 	u32 *dma_range;
656 	/* sized based on pci addr cells, size-cells, & address-cells */
657 	u32 dma_ranges[(3 + 2 + 2) * CONFIG_SYS_PCI_NR_INBOUND_WIN];
658 
659 	addrcell = fdt_getprop_u32_default(blob, "/", "#address-cells", 1);
660 	sizecell = fdt_getprop_u32_default(blob, "/", "#size-cells", 1);
661 
662 	dma_range = &dma_ranges[0];
663 	for (r = 0; r < hose->region_count; r++) {
664 		u64 bus_start, phys_start, size;
665 
666 		/* skip if !PCI_REGION_SYS_MEMORY */
667 		if (!(hose->regions[r].flags & PCI_REGION_SYS_MEMORY))
668 			continue;
669 
670 		bus_start = (u64)hose->regions[r].bus_start;
671 		phys_start = (u64)hose->regions[r].phys_start;
672 		size = (u64)hose->regions[r].size;
673 
674 		dma_range[0] = 0;
675 		if (size >= 0x100000000ull)
676 			dma_range[0] |= FDT_PCI_MEM64;
677 		else
678 			dma_range[0] |= FDT_PCI_MEM32;
679 		if (hose->regions[r].flags & PCI_REGION_PREFETCH)
680 			dma_range[0] |= FDT_PCI_PREFETCH;
681 #ifdef CONFIG_SYS_PCI_64BIT
682 		dma_range[1] = bus_start >> 32;
683 #else
684 		dma_range[1] = 0;
685 #endif
686 		dma_range[2] = bus_start & 0xffffffff;
687 
688 		if (addrcell == 2) {
689 			dma_range[3] = phys_start >> 32;
690 			dma_range[4] = phys_start & 0xffffffff;
691 		} else {
692 			dma_range[3] = phys_start & 0xffffffff;
693 		}
694 
695 		if (sizecell == 2) {
696 			dma_range[3 + addrcell + 0] = size >> 32;
697 			dma_range[3 + addrcell + 1] = size & 0xffffffff;
698 		} else {
699 			dma_range[3 + addrcell + 0] = size & 0xffffffff;
700 		}
701 
702 		dma_range += (3 + addrcell + sizecell);
703 	}
704 
705 	len = dma_range - &dma_ranges[0];
706 	if (len)
707 		fdt_setprop(blob, phb_off, "dma-ranges", &dma_ranges[0], len*4);
708 
709 	return 0;
710 }
711 #endif
712 
fdt_increase_size(void * fdt,int add_len)713 int fdt_increase_size(void *fdt, int add_len)
714 {
715 	int newlen;
716 
717 	newlen = fdt_totalsize(fdt) + add_len;
718 
719 	/* Open in place with a new len */
720 	return fdt_open_into(fdt, fdt, newlen);
721 }
722 
723 #ifdef CONFIG_FDT_FIXUP_PARTITIONS
724 #include <jffs2/load_kernel.h>
725 #include <mtd_node.h>
726 
727 struct reg_cell {
728 	unsigned int r0;
729 	unsigned int r1;
730 };
731 
fdt_del_subnodes(const void * blob,int parent_offset)732 static int fdt_del_subnodes(const void *blob, int parent_offset)
733 {
734 	int off, ndepth;
735 	int ret;
736 
737 	for (ndepth = 0, off = fdt_next_node(blob, parent_offset, &ndepth);
738 	     (off >= 0) && (ndepth > 0);
739 	     off = fdt_next_node(blob, off, &ndepth)) {
740 		if (ndepth == 1) {
741 			debug("delete %s: offset: %x\n",
742 				fdt_get_name(blob, off, 0), off);
743 			ret = fdt_del_node((void *)blob, off);
744 			if (ret < 0) {
745 				printf("Can't delete node: %s\n",
746 					fdt_strerror(ret));
747 				return ret;
748 			} else {
749 				ndepth = 0;
750 				off = parent_offset;
751 			}
752 		}
753 	}
754 	return 0;
755 }
756 
fdt_del_partitions(void * blob,int parent_offset)757 static int fdt_del_partitions(void *blob, int parent_offset)
758 {
759 	const void *prop;
760 	int ndepth = 0;
761 	int off;
762 	int ret;
763 
764 	off = fdt_next_node(blob, parent_offset, &ndepth);
765 	if (off > 0 && ndepth == 1) {
766 		prop = fdt_getprop(blob, off, "label", NULL);
767 		if (prop == NULL) {
768 			/*
769 			 * Could not find label property, nand {}; node?
770 			 * Check subnode, delete partitions there if any.
771 			 */
772 			return fdt_del_partitions(blob, off);
773 		} else {
774 			ret = fdt_del_subnodes(blob, parent_offset);
775 			if (ret < 0) {
776 				printf("Can't remove subnodes: %s\n",
777 					fdt_strerror(ret));
778 				return ret;
779 			}
780 		}
781 	}
782 	return 0;
783 }
784 
fdt_node_set_part_info(void * blob,int parent_offset,struct mtd_device * dev)785 int fdt_node_set_part_info(void *blob, int parent_offset,
786 			   struct mtd_device *dev)
787 {
788 	struct list_head *pentry;
789 	struct part_info *part;
790 	struct reg_cell cell;
791 	int off, ndepth = 0;
792 	int part_num, ret;
793 	char buf[64];
794 
795 	ret = fdt_del_partitions(blob, parent_offset);
796 	if (ret < 0)
797 		return ret;
798 
799 	/*
800 	 * Check if it is nand {}; subnode, adjust
801 	 * the offset in this case
802 	 */
803 	off = fdt_next_node(blob, parent_offset, &ndepth);
804 	if (off > 0 && ndepth == 1)
805 		parent_offset = off;
806 
807 	part_num = 0;
808 	list_for_each_prev(pentry, &dev->parts) {
809 		int newoff;
810 
811 		part = list_entry(pentry, struct part_info, link);
812 
813 		debug("%2d: %-20s0x%08llx\t0x%08llx\t%d\n",
814 			part_num, part->name, part->size,
815 			part->offset, part->mask_flags);
816 
817 		sprintf(buf, "partition@%llx", part->offset);
818 add_sub:
819 		ret = fdt_add_subnode(blob, parent_offset, buf);
820 		if (ret == -FDT_ERR_NOSPACE) {
821 			ret = fdt_increase_size(blob, 512);
822 			if (!ret)
823 				goto add_sub;
824 			else
825 				goto err_size;
826 		} else if (ret < 0) {
827 			printf("Can't add partition node: %s\n",
828 				fdt_strerror(ret));
829 			return ret;
830 		}
831 		newoff = ret;
832 
833 		/* Check MTD_WRITEABLE_CMD flag */
834 		if (part->mask_flags & 1) {
835 add_ro:
836 			ret = fdt_setprop(blob, newoff, "read_only", NULL, 0);
837 			if (ret == -FDT_ERR_NOSPACE) {
838 				ret = fdt_increase_size(blob, 512);
839 				if (!ret)
840 					goto add_ro;
841 				else
842 					goto err_size;
843 			} else if (ret < 0)
844 				goto err_prop;
845 		}
846 
847 		cell.r0 = cpu_to_fdt32(part->offset);
848 		cell.r1 = cpu_to_fdt32(part->size);
849 add_reg:
850 		ret = fdt_setprop(blob, newoff, "reg", &cell, sizeof(cell));
851 		if (ret == -FDT_ERR_NOSPACE) {
852 			ret = fdt_increase_size(blob, 512);
853 			if (!ret)
854 				goto add_reg;
855 			else
856 				goto err_size;
857 		} else if (ret < 0)
858 			goto err_prop;
859 
860 add_label:
861 		ret = fdt_setprop_string(blob, newoff, "label", part->name);
862 		if (ret == -FDT_ERR_NOSPACE) {
863 			ret = fdt_increase_size(blob, 512);
864 			if (!ret)
865 				goto add_label;
866 			else
867 				goto err_size;
868 		} else if (ret < 0)
869 			goto err_prop;
870 
871 		part_num++;
872 	}
873 	return 0;
874 err_size:
875 	printf("Can't increase blob size: %s\n", fdt_strerror(ret));
876 	return ret;
877 err_prop:
878 	printf("Can't add property: %s\n", fdt_strerror(ret));
879 	return ret;
880 }
881 
882 /*
883  * Update partitions in nor/nand nodes using info from
884  * mtdparts environment variable. The nodes to update are
885  * specified by node_info structure which contains mtd device
886  * type and compatible string: E. g. the board code in
887  * ft_board_setup() could use:
888  *
889  *	struct node_info nodes[] = {
890  *		{ "fsl,mpc5121-nfc",    MTD_DEV_TYPE_NAND, },
891  *		{ "cfi-flash",          MTD_DEV_TYPE_NOR,  },
892  *	};
893  *
894  *	fdt_fixup_mtdparts(blob, nodes, ARRAY_SIZE(nodes));
895  */
fdt_fixup_mtdparts(void * blob,const struct node_info * node_info,int node_info_size)896 void fdt_fixup_mtdparts(void *blob, const struct node_info *node_info,
897 			int node_info_size)
898 {
899 	struct mtd_device *dev;
900 	int i, idx;
901 	int noff;
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,
909 						     node_info[i].compat);
910 		while (noff != -FDT_ERR_NOTFOUND) {
911 			debug("%s: %s, mtd dev type %d\n",
912 				fdt_get_name(blob, noff, 0),
913 				node_info[i].compat, node_info[i].type);
914 			dev = device_find(node_info[i].type, idx++);
915 			if (dev) {
916 				if (fdt_node_set_part_info(blob, noff, dev))
917 					return; /* return on error */
918 			}
919 
920 			/* Jump to next flash node */
921 			noff = fdt_node_offset_by_compatible(blob, noff,
922 							     node_info[i].compat);
923 		}
924 	}
925 }
926 #endif
927 
fdt_del_node_and_alias(void * blob,const char * alias)928 void fdt_del_node_and_alias(void *blob, const char *alias)
929 {
930 	int off = fdt_path_offset(blob, alias);
931 
932 	if (off < 0)
933 		return;
934 
935 	fdt_del_node(blob, off);
936 
937 	off = fdt_path_offset(blob, "/aliases");
938 	fdt_delprop(blob, off, alias);
939 }
940 
941 /* Max address size we deal with */
942 #define OF_MAX_ADDR_CELLS	4
943 #define OF_BAD_ADDR	FDT_ADDR_T_NONE
944 #define OF_CHECK_COUNTS(na, ns)	((na) > 0 && (na) <= OF_MAX_ADDR_CELLS && \
945 			(ns) > 0)
946 
947 /* Debug utility */
948 #ifdef DEBUG
of_dump_addr(const char * s,const fdt32_t * addr,int na)949 static void of_dump_addr(const char *s, const fdt32_t *addr, int na)
950 {
951 	printf("%s", s);
952 	while(na--)
953 		printf(" %08x", *(addr++));
954 	printf("\n");
955 }
956 #else
of_dump_addr(const char * s,const fdt32_t * addr,int na)957 static void of_dump_addr(const char *s, const fdt32_t *addr, int na) { }
958 #endif
959 
960 /**
961  * struct of_bus - Callbacks for bus specific translators
962  * @name:	A string used to identify this bus in debug output.
963  * @addresses:	The name of the DT property from which addresses are
964  *		to be read, typically "reg".
965  * @match:	Return non-zero if the node whose parent is at
966  *		parentoffset in the FDT blob corresponds to a bus
967  *		of this type, otherwise return zero. If NULL a match
968  *		is assumed.
969  * @count_cells:Count how many cells (be32 values) a node whose parent
970  *		is at parentoffset in the FDT blob will require to
971  *		represent its address (written to *addrc) & size
972  *		(written to *sizec).
973  * @map:	Map the address addr from the address space of this
974  *		bus to that of its parent, making use of the ranges
975  *		read from DT to an array at range. na and ns are the
976  *		number of cells (be32 values) used to hold and address
977  *		or size, respectively, for this bus. pna is the number
978  *		of cells used to hold an address for the parent bus.
979  *		Returns the address in the address space of the parent
980  *		bus.
981  * @translate:	Update the value of the address cells at addr within an
982  *		FDT by adding offset to it. na specifies the number of
983  *		cells used to hold the address being translated. Returns
984  *		zero on success, non-zero on error.
985  *
986  * Each bus type will include a struct of_bus in the of_busses array,
987  * providing implementations of some or all of the functions used to
988  * match the bus & handle address translation for its children.
989  */
990 struct of_bus {
991 	const char	*name;
992 	const char	*addresses;
993 	int		(*match)(const void *blob, int parentoffset);
994 	void		(*count_cells)(const void *blob, int parentoffset,
995 				int *addrc, int *sizec);
996 	u64		(*map)(fdt32_t *addr, const fdt32_t *range,
997 				int na, int ns, int pna);
998 	int		(*translate)(fdt32_t *addr, u64 offset, int na);
999 };
1000 
1001 /* Default translator (generic bus) */
fdt_support_default_count_cells(const void * blob,int parentoffset,int * addrc,int * sizec)1002 void fdt_support_default_count_cells(const void *blob, int parentoffset,
1003 					int *addrc, int *sizec)
1004 {
1005 	const fdt32_t *prop;
1006 
1007 	if (addrc)
1008 		*addrc = fdt_address_cells(blob, parentoffset);
1009 
1010 	if (sizec) {
1011 		prop = fdt_getprop(blob, parentoffset, "#size-cells", NULL);
1012 		if (prop)
1013 			*sizec = be32_to_cpup(prop);
1014 		else
1015 			*sizec = 1;
1016 	}
1017 }
1018 
of_bus_default_map(fdt32_t * addr,const fdt32_t * range,int na,int ns,int pna)1019 static u64 of_bus_default_map(fdt32_t *addr, const fdt32_t *range,
1020 		int na, int ns, int pna)
1021 {
1022 	u64 cp, s, da;
1023 
1024 	cp = fdt_read_number(range, na);
1025 	s  = fdt_read_number(range + na + pna, ns);
1026 	da = fdt_read_number(addr, na);
1027 
1028 	debug("OF: default map, cp=%llx, s=%llx, da=%llx\n", cp, s, da);
1029 
1030 	if (da < cp || da >= (cp + s))
1031 		return OF_BAD_ADDR;
1032 	return da - cp;
1033 }
1034 
of_bus_default_translate(fdt32_t * addr,u64 offset,int na)1035 static int of_bus_default_translate(fdt32_t *addr, u64 offset, int na)
1036 {
1037 	u64 a = fdt_read_number(addr, na);
1038 	memset(addr, 0, na * 4);
1039 	a += offset;
1040 	if (na > 1)
1041 		addr[na - 2] = cpu_to_fdt32(a >> 32);
1042 	addr[na - 1] = cpu_to_fdt32(a & 0xffffffffu);
1043 
1044 	return 0;
1045 }
1046 
1047 #ifdef CONFIG_OF_ISA_BUS
1048 
1049 /* ISA bus translator */
of_bus_isa_match(const void * blob,int parentoffset)1050 static int of_bus_isa_match(const void *blob, int parentoffset)
1051 {
1052 	const char *name;
1053 
1054 	name = fdt_get_name(blob, parentoffset, NULL);
1055 	if (!name)
1056 		return 0;
1057 
1058 	return !strcmp(name, "isa");
1059 }
1060 
of_bus_isa_count_cells(const void * blob,int parentoffset,int * addrc,int * sizec)1061 static void of_bus_isa_count_cells(const void *blob, int parentoffset,
1062 				   int *addrc, int *sizec)
1063 {
1064 	if (addrc)
1065 		*addrc = 2;
1066 	if (sizec)
1067 		*sizec = 1;
1068 }
1069 
of_bus_isa_map(fdt32_t * addr,const fdt32_t * range,int na,int ns,int pna)1070 static u64 of_bus_isa_map(fdt32_t *addr, const fdt32_t *range,
1071 			  int na, int ns, int pna)
1072 {
1073 	u64 cp, s, da;
1074 
1075 	/* Check address type match */
1076 	if ((addr[0] ^ range[0]) & cpu_to_be32(1))
1077 		return OF_BAD_ADDR;
1078 
1079 	cp = fdt_read_number(range + 1, na - 1);
1080 	s  = fdt_read_number(range + na + pna, ns);
1081 	da = fdt_read_number(addr + 1, na - 1);
1082 
1083 	debug("OF: ISA map, cp=%llx, s=%llx, da=%llx\n", cp, s, da);
1084 
1085 	if (da < cp || da >= (cp + s))
1086 		return OF_BAD_ADDR;
1087 	return da - cp;
1088 }
1089 
of_bus_isa_translate(fdt32_t * addr,u64 offset,int na)1090 static int of_bus_isa_translate(fdt32_t *addr, u64 offset, int na)
1091 {
1092 	return of_bus_default_translate(addr + 1, offset, na - 1);
1093 }
1094 
1095 #endif /* CONFIG_OF_ISA_BUS */
1096 
1097 /* Array of bus specific translators */
1098 static struct of_bus of_busses[] = {
1099 #ifdef CONFIG_OF_ISA_BUS
1100 	/* ISA */
1101 	{
1102 		.name = "isa",
1103 		.addresses = "reg",
1104 		.match = of_bus_isa_match,
1105 		.count_cells = of_bus_isa_count_cells,
1106 		.map = of_bus_isa_map,
1107 		.translate = of_bus_isa_translate,
1108 	},
1109 #endif /* CONFIG_OF_ISA_BUS */
1110 	/* Default */
1111 	{
1112 		.name = "default",
1113 		.addresses = "reg",
1114 		.count_cells = fdt_support_default_count_cells,
1115 		.map = of_bus_default_map,
1116 		.translate = of_bus_default_translate,
1117 	},
1118 };
1119 
of_match_bus(const void * blob,int parentoffset)1120 static struct of_bus *of_match_bus(const void *blob, int parentoffset)
1121 {
1122 	struct of_bus *bus;
1123 
1124 	if (ARRAY_SIZE(of_busses) == 1)
1125 		return of_busses;
1126 
1127 	for (bus = of_busses; bus; bus++) {
1128 		if (!bus->match || bus->match(blob, parentoffset))
1129 			return bus;
1130 	}
1131 
1132 	/*
1133 	 * We should always have matched the default bus at least, since
1134 	 * it has a NULL match field. If we didn't then it somehow isn't
1135 	 * in the of_busses array or something equally catastrophic has
1136 	 * gone wrong.
1137 	 */
1138 	assert(0);
1139 	return NULL;
1140 }
1141 
of_translate_one(const void * blob,int parent,struct of_bus * bus,struct of_bus * pbus,fdt32_t * addr,int na,int ns,int pna,const char * rprop)1142 static int of_translate_one(const void *blob, int parent, struct of_bus *bus,
1143 			    struct of_bus *pbus, fdt32_t *addr,
1144 			    int na, int ns, int pna, const char *rprop)
1145 {
1146 	const fdt32_t *ranges;
1147 	int rlen;
1148 	int rone;
1149 	u64 offset = OF_BAD_ADDR;
1150 
1151 	/* Normally, an absence of a "ranges" property means we are
1152 	 * crossing a non-translatable boundary, and thus the addresses
1153 	 * below the current not cannot be converted to CPU physical ones.
1154 	 * Unfortunately, while this is very clear in the spec, it's not
1155 	 * what Apple understood, and they do have things like /uni-n or
1156 	 * /ht nodes with no "ranges" property and a lot of perfectly
1157 	 * useable mapped devices below them. Thus we treat the absence of
1158 	 * "ranges" as equivalent to an empty "ranges" property which means
1159 	 * a 1:1 translation at that level. It's up to the caller not to try
1160 	 * to translate addresses that aren't supposed to be translated in
1161 	 * the first place. --BenH.
1162 	 */
1163 	ranges = fdt_getprop(blob, parent, rprop, &rlen);
1164 	if (ranges == NULL || rlen == 0) {
1165 		offset = fdt_read_number(addr, na);
1166 		memset(addr, 0, pna * 4);
1167 		debug("OF: no ranges, 1:1 translation\n");
1168 		goto finish;
1169 	}
1170 
1171 	debug("OF: walking ranges...\n");
1172 
1173 	/* Now walk through the ranges */
1174 	rlen /= 4;
1175 	rone = na + pna + ns;
1176 	for (; rlen >= rone; rlen -= rone, ranges += rone) {
1177 		offset = bus->map(addr, ranges, na, ns, pna);
1178 		if (offset != OF_BAD_ADDR)
1179 			break;
1180 	}
1181 	if (offset == OF_BAD_ADDR) {
1182 		debug("OF: not found !\n");
1183 		return 1;
1184 	}
1185 	memcpy(addr, ranges + na, 4 * pna);
1186 
1187  finish:
1188 	of_dump_addr("OF: parent translation for:", addr, pna);
1189 	debug("OF: with offset: %llu\n", offset);
1190 
1191 	/* Translate it into parent bus space */
1192 	return pbus->translate(addr, offset, pna);
1193 }
1194 
1195 /*
1196  * Translate an address from the device-tree into a CPU physical address,
1197  * this walks up the tree and applies the various bus mappings on the
1198  * way.
1199  *
1200  * Note: We consider that crossing any level with #size-cells == 0 to mean
1201  * that translation is impossible (that is we are not dealing with a value
1202  * that can be mapped to a cpu physical address). This is not really specified
1203  * that way, but this is traditionally the way IBM at least do things
1204  */
__of_translate_address(const void * blob,int node_offset,const fdt32_t * in_addr,const char * rprop)1205 static u64 __of_translate_address(const void *blob, int node_offset,
1206 				  const fdt32_t *in_addr, const char *rprop)
1207 {
1208 	int parent;
1209 	struct of_bus *bus, *pbus;
1210 	fdt32_t addr[OF_MAX_ADDR_CELLS];
1211 	int na, ns, pna, pns;
1212 	u64 result = OF_BAD_ADDR;
1213 
1214 	debug("OF: ** translation for device %s **\n",
1215 		fdt_get_name(blob, node_offset, NULL));
1216 
1217 	/* Get parent & match bus type */
1218 	parent = fdt_parent_offset(blob, node_offset);
1219 	if (parent < 0)
1220 		goto bail;
1221 	bus = of_match_bus(blob, parent);
1222 
1223 	/* Cound address cells & copy address locally */
1224 	bus->count_cells(blob, parent, &na, &ns);
1225 	if (!OF_CHECK_COUNTS(na, ns)) {
1226 		printf("%s: Bad cell count for %s\n", __FUNCTION__,
1227 		       fdt_get_name(blob, node_offset, NULL));
1228 		goto bail;
1229 	}
1230 	memcpy(addr, in_addr, na * 4);
1231 
1232 	debug("OF: bus is %s (na=%d, ns=%d) on %s\n",
1233 	    bus->name, na, ns, fdt_get_name(blob, parent, NULL));
1234 	of_dump_addr("OF: translating address:", addr, na);
1235 
1236 	/* Translate */
1237 	for (;;) {
1238 		/* Switch to parent bus */
1239 		node_offset = parent;
1240 		parent = fdt_parent_offset(blob, node_offset);
1241 
1242 		/* If root, we have finished */
1243 		if (parent < 0) {
1244 			debug("OF: reached root node\n");
1245 			result = fdt_read_number(addr, na);
1246 			break;
1247 		}
1248 
1249 		/* Get new parent bus and counts */
1250 		pbus = of_match_bus(blob, parent);
1251 		pbus->count_cells(blob, parent, &pna, &pns);
1252 		if (!OF_CHECK_COUNTS(pna, pns)) {
1253 			printf("%s: Bad cell count for %s\n", __FUNCTION__,
1254 				fdt_get_name(blob, node_offset, NULL));
1255 			break;
1256 		}
1257 
1258 		debug("OF: parent bus is %s (na=%d, ns=%d) on %s\n",
1259 		    pbus->name, pna, pns, fdt_get_name(blob, parent, NULL));
1260 
1261 		/* Apply bus translation */
1262 		if (of_translate_one(blob, node_offset, bus, pbus,
1263 					addr, na, ns, pna, rprop))
1264 			break;
1265 
1266 		/* Complete the move up one level */
1267 		na = pna;
1268 		ns = pns;
1269 		bus = pbus;
1270 
1271 		of_dump_addr("OF: one level translation:", addr, na);
1272 	}
1273  bail:
1274 
1275 	return result;
1276 }
1277 
fdt_translate_address(const void * blob,int node_offset,const fdt32_t * in_addr)1278 u64 fdt_translate_address(const void *blob, int node_offset,
1279 			  const fdt32_t *in_addr)
1280 {
1281 	return __of_translate_address(blob, node_offset, in_addr, "ranges");
1282 }
1283 
1284 /**
1285  * fdt_node_offset_by_compat_reg: Find a node that matches compatiable and
1286  * who's reg property matches a physical cpu address
1287  *
1288  * @blob: ptr to device tree
1289  * @compat: compatiable string to match
1290  * @compat_off: property name
1291  *
1292  */
fdt_node_offset_by_compat_reg(void * blob,const char * compat,phys_addr_t compat_off)1293 int fdt_node_offset_by_compat_reg(void *blob, const char *compat,
1294 					phys_addr_t compat_off)
1295 {
1296 	int len, off = fdt_node_offset_by_compatible(blob, -1, compat);
1297 	while (off != -FDT_ERR_NOTFOUND) {
1298 		const fdt32_t *reg = fdt_getprop(blob, off, "reg", &len);
1299 		if (reg) {
1300 			if (compat_off == fdt_translate_address(blob, off, reg))
1301 				return off;
1302 		}
1303 		off = fdt_node_offset_by_compatible(blob, off, compat);
1304 	}
1305 
1306 	return -FDT_ERR_NOTFOUND;
1307 }
1308 
1309 /**
1310  * fdt_alloc_phandle: Return next free phandle value
1311  *
1312  * @blob: ptr to device tree
1313  */
fdt_alloc_phandle(void * blob)1314 int fdt_alloc_phandle(void *blob)
1315 {
1316 	int offset;
1317 	uint32_t phandle = 0;
1318 
1319 	for (offset = fdt_next_node(blob, -1, NULL); offset >= 0;
1320 	     offset = fdt_next_node(blob, offset, NULL)) {
1321 		phandle = max(phandle, fdt_get_phandle(blob, offset));
1322 	}
1323 
1324 	return phandle + 1;
1325 }
1326 
1327 /*
1328  * fdt_set_phandle: Create a phandle property for the given node
1329  *
1330  * @fdt: ptr to device tree
1331  * @nodeoffset: node to update
1332  * @phandle: phandle value to set (must be unique)
1333  */
fdt_set_phandle(void * fdt,int nodeoffset,uint32_t phandle)1334 int fdt_set_phandle(void *fdt, int nodeoffset, uint32_t phandle)
1335 {
1336 	int ret;
1337 
1338 #ifdef DEBUG
1339 	int off = fdt_node_offset_by_phandle(fdt, phandle);
1340 
1341 	if ((off >= 0) && (off != nodeoffset)) {
1342 		char buf[64];
1343 
1344 		fdt_get_path(fdt, nodeoffset, buf, sizeof(buf));
1345 		printf("Trying to update node %s with phandle %u ",
1346 		       buf, phandle);
1347 
1348 		fdt_get_path(fdt, off, buf, sizeof(buf));
1349 		printf("that already exists in node %s.\n", buf);
1350 		return -FDT_ERR_BADPHANDLE;
1351 	}
1352 #endif
1353 
1354 	ret = fdt_setprop_cell(fdt, nodeoffset, "phandle", phandle);
1355 	if (ret < 0)
1356 		return ret;
1357 
1358 	/*
1359 	 * For now, also set the deprecated "linux,phandle" property, so that we
1360 	 * don't break older kernels.
1361 	 */
1362 	ret = fdt_setprop_cell(fdt, nodeoffset, "linux,phandle", phandle);
1363 
1364 	return ret;
1365 }
1366 
1367 /*
1368  * fdt_create_phandle: Create a phandle property for the given node
1369  *
1370  * @fdt: ptr to device tree
1371  * @nodeoffset: node to update
1372  */
fdt_create_phandle(void * fdt,int nodeoffset)1373 unsigned int fdt_create_phandle(void *fdt, int nodeoffset)
1374 {
1375 	/* see if there is a phandle already */
1376 	int phandle = fdt_get_phandle(fdt, nodeoffset);
1377 
1378 	/* if we got 0, means no phandle so create one */
1379 	if (phandle == 0) {
1380 		int ret;
1381 
1382 		phandle = fdt_alloc_phandle(fdt);
1383 		ret = fdt_set_phandle(fdt, nodeoffset, phandle);
1384 		if (ret < 0) {
1385 			printf("Can't set phandle %u: %s\n", phandle,
1386 			       fdt_strerror(ret));
1387 			return 0;
1388 		}
1389 	}
1390 
1391 	return phandle;
1392 }
1393 
1394 /*
1395  * fdt_set_node_status: Set status for the given node
1396  *
1397  * @fdt: ptr to device tree
1398  * @nodeoffset: node to update
1399  * @status: FDT_STATUS_OKAY, FDT_STATUS_DISABLED,
1400  *	    FDT_STATUS_FAIL, FDT_STATUS_FAIL_ERROR_CODE
1401  * @error_code: optional, only used if status is FDT_STATUS_FAIL_ERROR_CODE
1402  */
fdt_set_node_status(void * fdt,int nodeoffset,enum fdt_status status,unsigned int error_code)1403 int fdt_set_node_status(void *fdt, int nodeoffset,
1404 			enum fdt_status status, unsigned int error_code)
1405 {
1406 	char buf[16];
1407 	int ret = 0;
1408 
1409 	if (nodeoffset < 0)
1410 		return nodeoffset;
1411 
1412 	switch (status) {
1413 	case FDT_STATUS_OKAY:
1414 		ret = fdt_setprop_string(fdt, nodeoffset, "status", "okay");
1415 		break;
1416 	case FDT_STATUS_DISABLED:
1417 		ret = fdt_setprop_string(fdt, nodeoffset, "status", "disabled");
1418 		break;
1419 	case FDT_STATUS_FAIL:
1420 		ret = fdt_setprop_string(fdt, nodeoffset, "status", "fail");
1421 		break;
1422 	case FDT_STATUS_FAIL_ERROR_CODE:
1423 		sprintf(buf, "fail-%d", error_code);
1424 		ret = fdt_setprop_string(fdt, nodeoffset, "status", buf);
1425 		break;
1426 	default:
1427 		printf("Invalid fdt status: %x\n", status);
1428 		ret = -1;
1429 		break;
1430 	}
1431 
1432 	return ret;
1433 }
1434 
1435 /*
1436  * fdt_set_status_by_alias: Set status for the given node given an alias
1437  *
1438  * @fdt: ptr to device tree
1439  * @alias: alias of node to update
1440  * @status: FDT_STATUS_OKAY, FDT_STATUS_DISABLED,
1441  *	    FDT_STATUS_FAIL, FDT_STATUS_FAIL_ERROR_CODE
1442  * @error_code: optional, only used if status is FDT_STATUS_FAIL_ERROR_CODE
1443  */
fdt_set_status_by_alias(void * fdt,const char * alias,enum fdt_status status,unsigned int error_code)1444 int fdt_set_status_by_alias(void *fdt, const char* alias,
1445 			    enum fdt_status status, unsigned int error_code)
1446 {
1447 	int offset = fdt_path_offset(fdt, alias);
1448 
1449 	return fdt_set_node_status(fdt, offset, status, error_code);
1450 }
1451 
1452 #if defined(CONFIG_VIDEO) || defined(CONFIG_LCD)
fdt_add_edid(void * blob,const char * compat,unsigned char * edid_buf)1453 int fdt_add_edid(void *blob, const char *compat, unsigned char *edid_buf)
1454 {
1455 	int noff;
1456 	int ret;
1457 
1458 	noff = fdt_node_offset_by_compatible(blob, -1, compat);
1459 	if (noff != -FDT_ERR_NOTFOUND) {
1460 		debug("%s: %s\n", fdt_get_name(blob, noff, 0), compat);
1461 add_edid:
1462 		ret = fdt_setprop(blob, noff, "edid", edid_buf, 128);
1463 		if (ret == -FDT_ERR_NOSPACE) {
1464 			ret = fdt_increase_size(blob, 512);
1465 			if (!ret)
1466 				goto add_edid;
1467 			else
1468 				goto err_size;
1469 		} else if (ret < 0) {
1470 			printf("Can't add property: %s\n", fdt_strerror(ret));
1471 			return ret;
1472 		}
1473 	}
1474 	return 0;
1475 err_size:
1476 	printf("Can't increase blob size: %s\n", fdt_strerror(ret));
1477 	return ret;
1478 }
1479 #endif
1480 
1481 /*
1482  * Verify the physical address of device tree node for a given alias
1483  *
1484  * This function locates the device tree node of a given alias, and then
1485  * verifies that the physical address of that device matches the given
1486  * parameter.  It displays a message if there is a mismatch.
1487  *
1488  * Returns 1 on success, 0 on failure
1489  */
fdt_verify_alias_address(void * fdt,int anode,const char * alias,u64 addr)1490 int fdt_verify_alias_address(void *fdt, int anode, const char *alias, u64 addr)
1491 {
1492 	const char *path;
1493 	const fdt32_t *reg;
1494 	int node, len;
1495 	u64 dt_addr;
1496 
1497 	path = fdt_getprop(fdt, anode, alias, NULL);
1498 	if (!path) {
1499 		/* If there's no such alias, then it's not a failure */
1500 		return 1;
1501 	}
1502 
1503 	node = fdt_path_offset(fdt, path);
1504 	if (node < 0) {
1505 		printf("Warning: device tree alias '%s' points to invalid "
1506 		       "node %s.\n", alias, path);
1507 		return 0;
1508 	}
1509 
1510 	reg = fdt_getprop(fdt, node, "reg", &len);
1511 	if (!reg) {
1512 		printf("Warning: device tree node '%s' has no address.\n",
1513 		       path);
1514 		return 0;
1515 	}
1516 
1517 	dt_addr = fdt_translate_address(fdt, node, reg);
1518 	if (addr != dt_addr) {
1519 		printf("Warning: U-Boot configured device %s at address %llu,\n"
1520 		       "but the device tree has it address %llx.\n",
1521 		       alias, addr, dt_addr);
1522 		return 0;
1523 	}
1524 
1525 	return 1;
1526 }
1527 
1528 /*
1529  * Returns the base address of an SOC or PCI node
1530  */
fdt_get_base_address(const void * fdt,int node)1531 u64 fdt_get_base_address(const void *fdt, int node)
1532 {
1533 	int size;
1534 	const fdt32_t *prop;
1535 
1536 	prop = fdt_getprop(fdt, node, "reg", &size);
1537 
1538 	return prop ? fdt_translate_address(fdt, node, prop) : 0;
1539 }
1540 
1541 /*
1542  * Read a property of size <prop_len>. Currently only supports 1 or 2 cells.
1543  */
fdt_read_prop(const fdt32_t * prop,int prop_len,int cell_off,uint64_t * val,int cells)1544 static int fdt_read_prop(const fdt32_t *prop, int prop_len, int cell_off,
1545 			 uint64_t *val, int cells)
1546 {
1547 	const fdt32_t *prop32 = &prop[cell_off];
1548 	const fdt64_t *prop64 = (const fdt64_t *)&prop[cell_off];
1549 
1550 	if ((cell_off + cells) > prop_len)
1551 		return -FDT_ERR_NOSPACE;
1552 
1553 	switch (cells) {
1554 	case 1:
1555 		*val = fdt32_to_cpu(*prop32);
1556 		break;
1557 	case 2:
1558 		*val = fdt64_to_cpu(*prop64);
1559 		break;
1560 	default:
1561 		return -FDT_ERR_NOSPACE;
1562 	}
1563 
1564 	return 0;
1565 }
1566 
1567 /**
1568  * fdt_read_range - Read a node's n'th range property
1569  *
1570  * @fdt: ptr to device tree
1571  * @node: offset of node
1572  * @n: range index
1573  * @child_addr: pointer to storage for the "child address" field
1574  * @addr: pointer to storage for the CPU view translated physical start
1575  * @len: pointer to storage for the range length
1576  *
1577  * Convenience function that reads and interprets a specific range out of
1578  * a number of the "ranges" property array.
1579  */
fdt_read_range(void * fdt,int node,int n,uint64_t * child_addr,uint64_t * addr,uint64_t * len)1580 int fdt_read_range(void *fdt, int node, int n, uint64_t *child_addr,
1581 		   uint64_t *addr, uint64_t *len)
1582 {
1583 	int pnode = fdt_parent_offset(fdt, node);
1584 	const fdt32_t *ranges;
1585 	int pacells;
1586 	int acells;
1587 	int scells;
1588 	int ranges_len;
1589 	int cell = 0;
1590 	int r = 0;
1591 
1592 	/*
1593 	 * The "ranges" property is an array of
1594 	 * { <child address> <parent address> <size in child address space> }
1595 	 *
1596 	 * All 3 elements can span a diffent number of cells. Fetch their size.
1597 	 */
1598 	pacells = fdt_getprop_u32_default_node(fdt, pnode, 0, "#address-cells", 1);
1599 	acells = fdt_getprop_u32_default_node(fdt, node, 0, "#address-cells", 1);
1600 	scells = fdt_getprop_u32_default_node(fdt, node, 0, "#size-cells", 1);
1601 
1602 	/* Now try to get the ranges property */
1603 	ranges = fdt_getprop(fdt, node, "ranges", &ranges_len);
1604 	if (!ranges)
1605 		return -FDT_ERR_NOTFOUND;
1606 	ranges_len /= sizeof(uint32_t);
1607 
1608 	/* Jump to the n'th entry */
1609 	cell = n * (pacells + acells + scells);
1610 
1611 	/* Read <child address> */
1612 	if (child_addr) {
1613 		r = fdt_read_prop(ranges, ranges_len, cell, child_addr,
1614 				  acells);
1615 		if (r)
1616 			return r;
1617 	}
1618 	cell += acells;
1619 
1620 	/* Read <parent address> */
1621 	if (addr)
1622 		*addr = fdt_translate_address(fdt, node, ranges + cell);
1623 	cell += pacells;
1624 
1625 	/* Read <size in child address space> */
1626 	if (len) {
1627 		r = fdt_read_prop(ranges, ranges_len, cell, len, scells);
1628 		if (r)
1629 			return r;
1630 	}
1631 
1632 	return 0;
1633 }
1634 
1635 /**
1636  * fdt_setup_simplefb_node - Fill and enable a simplefb node
1637  *
1638  * @fdt: ptr to device tree
1639  * @node: offset of the simplefb node
1640  * @base_address: framebuffer base address
1641  * @width: width in pixels
1642  * @height: height in pixels
1643  * @stride: bytes per line
1644  * @format: pixel format string
1645  *
1646  * Convenience function to fill and enable a simplefb node.
1647  */
fdt_setup_simplefb_node(void * fdt,int node,u64 base_address,u32 width,u32 height,u32 stride,const char * format)1648 int fdt_setup_simplefb_node(void *fdt, int node, u64 base_address, u32 width,
1649 			    u32 height, u32 stride, const char *format)
1650 {
1651 	char name[32];
1652 	fdt32_t cells[4];
1653 	int i, addrc, sizec, ret;
1654 
1655 	fdt_support_default_count_cells(fdt, fdt_parent_offset(fdt, node),
1656 					&addrc, &sizec);
1657 	i = 0;
1658 	if (addrc == 2)
1659 		cells[i++] = cpu_to_fdt32(base_address >> 32);
1660 	cells[i++] = cpu_to_fdt32(base_address);
1661 	if (sizec == 2)
1662 		cells[i++] = 0;
1663 	cells[i++] = cpu_to_fdt32(height * stride);
1664 
1665 	ret = fdt_setprop(fdt, node, "reg", cells, sizeof(cells[0]) * i);
1666 	if (ret < 0)
1667 		return ret;
1668 
1669 	snprintf(name, sizeof(name), "framebuffer@%llx", base_address);
1670 	ret = fdt_set_name(fdt, node, name);
1671 	if (ret < 0)
1672 		return ret;
1673 
1674 	ret = fdt_setprop_u32(fdt, node, "width", width);
1675 	if (ret < 0)
1676 		return ret;
1677 
1678 	ret = fdt_setprop_u32(fdt, node, "height", height);
1679 	if (ret < 0)
1680 		return ret;
1681 
1682 	ret = fdt_setprop_u32(fdt, node, "stride", stride);
1683 	if (ret < 0)
1684 		return ret;
1685 
1686 	ret = fdt_setprop_string(fdt, node, "format", format);
1687 	if (ret < 0)
1688 		return ret;
1689 
1690 	ret = fdt_setprop_string(fdt, node, "status", "okay");
1691 	if (ret < 0)
1692 		return ret;
1693 
1694 	return 0;
1695 }
1696 
1697 /*
1698  * Update native-mode in display-timings from display environment variable.
1699  * The node to update are specified by path.
1700  */
fdt_fixup_display(void * blob,const char * path,const char * display)1701 int fdt_fixup_display(void *blob, const char *path, const char *display)
1702 {
1703 	int off, toff;
1704 
1705 	if (!display || !path)
1706 		return -FDT_ERR_NOTFOUND;
1707 
1708 	toff = fdt_path_offset(blob, path);
1709 	if (toff >= 0)
1710 		toff = fdt_subnode_offset(blob, toff, "display-timings");
1711 	if (toff < 0)
1712 		return toff;
1713 
1714 	for (off = fdt_first_subnode(blob, toff);
1715 	     off >= 0;
1716 	     off = fdt_next_subnode(blob, off)) {
1717 		uint32_t h = fdt_get_phandle(blob, off);
1718 		debug("%s:0x%x\n", fdt_get_name(blob, off, NULL),
1719 		      fdt32_to_cpu(h));
1720 		if (strcasecmp(fdt_get_name(blob, off, NULL), display) == 0)
1721 			return fdt_setprop_u32(blob, toff, "native-mode", h);
1722 	}
1723 	return toff;
1724 }
1725 
1726 #ifdef CONFIG_OF_LIBFDT_OVERLAY
1727 /**
1728  * fdt_overlay_apply_verbose - Apply an overlay with verbose error reporting
1729  *
1730  * @fdt: ptr to device tree
1731  * @fdto: ptr to device tree overlay
1732  *
1733  * Convenience function to apply an overlay and display helpful messages
1734  * in the case of an error
1735  */
fdt_overlay_apply_verbose(void * fdt,void * fdto)1736 int fdt_overlay_apply_verbose(void *fdt, void *fdto)
1737 {
1738 	int err;
1739 	bool has_symbols;
1740 
1741 	err = fdt_path_offset(fdt, "/__symbols__");
1742 	has_symbols = err >= 0;
1743 
1744 	err = fdt_overlay_apply(fdt, fdto);
1745 	if (err < 0) {
1746 		printf("failed on fdt_overlay_apply(): %s\n",
1747 				fdt_strerror(err));
1748 		if (!has_symbols) {
1749 			printf("base fdt does did not have a /__symbols__ node\n");
1750 			printf("make sure you've compiled with -@\n");
1751 		}
1752 	}
1753 	return err;
1754 }
1755 #endif
1756