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[people/ms/u-boot.git] / common / cmd_fdt.c
1 /*
2 * (C) Copyright 2007
3 * Gerald Van Baren, Custom IDEAS, vanbaren@cideas.com
4 * Based on code written by:
5 * Pantelis Antoniou <pantelis.antoniou@gmail.com> and
6 * Matthew McClintock <msm@freescale.com>
7 *
8 * SPDX-License-Identifier: GPL-2.0+
9 */
10
11 #include <common.h>
12 #include <command.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 <asm/io.h>
19
20 #define MAX_LEVEL 32 /* how deeply nested we will go */
21 #define SCRATCHPAD 1024 /* bytes of scratchpad memory */
22 #ifndef CONFIG_CMD_FDT_MAX_DUMP
23 #define CONFIG_CMD_FDT_MAX_DUMP 64
24 #endif
25
26 /*
27 * Global data (for the gd->bd)
28 */
29 DECLARE_GLOBAL_DATA_PTR;
30
31 static int fdt_valid(struct fdt_header **blobp);
32 static int fdt_parse_prop(char *const*newval, int count, char *data, int *len);
33 static int fdt_print(const char *pathp, char *prop, int depth);
34 static int is_printable_string(const void *data, int len);
35
36 /*
37 * The working_fdt points to our working flattened device tree.
38 */
39 struct fdt_header *working_fdt;
40
41 void set_working_fdt_addr(void *addr)
42 {
43 void *buf;
44
45 buf = map_sysmem((ulong)addr, 0);
46 working_fdt = buf;
47 setenv_addr("fdtaddr", addr);
48 }
49
50 /*
51 * Get a value from the fdt and format it to be set in the environment
52 */
53 static int fdt_value_setenv(const void *nodep, int len, const char *var)
54 {
55 if (is_printable_string(nodep, len))
56 setenv(var, (void *)nodep);
57 else if (len == 4) {
58 char buf[11];
59
60 sprintf(buf, "0x%08X", *(uint32_t *)nodep);
61 setenv(var, buf);
62 } else if (len%4 == 0 && len <= 20) {
63 /* Needed to print things like sha1 hashes. */
64 char buf[41];
65 int i;
66
67 for (i = 0; i < len; i += sizeof(unsigned int))
68 sprintf(buf + (i * 2), "%08x",
69 *(unsigned int *)(nodep + i));
70 setenv(var, buf);
71 } else {
72 printf("error: unprintable value\n");
73 return 1;
74 }
75 return 0;
76 }
77
78 /*
79 * Flattened Device Tree command, see the help for parameter definitions.
80 */
81 static int do_fdt(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
82 {
83 if (argc < 2)
84 return CMD_RET_USAGE;
85
86 /*
87 * Set the address of the fdt
88 */
89 if (argv[1][0] == 'a') {
90 unsigned long addr;
91 int control = 0;
92 struct fdt_header *blob;
93 /*
94 * Set the address [and length] of the fdt.
95 */
96 argc -= 2;
97 argv += 2;
98 /* Temporary #ifdef - some archs don't have fdt_blob yet */
99 #ifdef CONFIG_OF_CONTROL
100 if (argc && !strcmp(*argv, "-c")) {
101 control = 1;
102 argc--;
103 argv++;
104 }
105 #endif
106 if (argc == 0) {
107 if (control)
108 blob = (struct fdt_header *)gd->fdt_blob;
109 else
110 blob = working_fdt;
111 if (!blob || !fdt_valid(&blob))
112 return 1;
113 printf("The address of the fdt is %#08lx\n",
114 control ? (ulong)blob :
115 getenv_hex("fdtaddr", 0));
116 return 0;
117 }
118
119 addr = simple_strtoul(argv[0], NULL, 16);
120 blob = map_sysmem(addr, 0);
121 if (!fdt_valid(&blob))
122 return 1;
123 if (control)
124 gd->fdt_blob = blob;
125 else
126 set_working_fdt_addr(blob);
127
128 if (argc >= 2) {
129 int len;
130 int err;
131 /*
132 * Optional new length
133 */
134 len = simple_strtoul(argv[1], NULL, 16);
135 if (len < fdt_totalsize(blob)) {
136 printf ("New length %d < existing length %d, "
137 "ignoring.\n",
138 len, fdt_totalsize(blob));
139 } else {
140 /*
141 * Open in place with a new length.
142 */
143 err = fdt_open_into(blob, blob, len);
144 if (err != 0) {
145 printf ("libfdt fdt_open_into(): %s\n",
146 fdt_strerror(err));
147 }
148 }
149 }
150
151 return CMD_RET_SUCCESS;
152 }
153
154 if (!working_fdt) {
155 puts(
156 "No FDT memory address configured. Please configure\n"
157 "the FDT address via \"fdt addr <address>\" command.\n"
158 "Aborting!\n");
159 return CMD_RET_FAILURE;
160 }
161
162 /*
163 * Move the working_fdt
164 */
165 if (strncmp(argv[1], "mo", 2) == 0) {
166 struct fdt_header *newaddr;
167 int len;
168 int err;
169
170 if (argc < 4)
171 return CMD_RET_USAGE;
172
173 /*
174 * Set the address and length of the fdt.
175 */
176 working_fdt = (struct fdt_header *)simple_strtoul(argv[2], NULL, 16);
177 if (!fdt_valid(&working_fdt))
178 return 1;
179
180 newaddr = (struct fdt_header *)simple_strtoul(argv[3],NULL,16);
181
182 /*
183 * If the user specifies a length, use that. Otherwise use the
184 * current length.
185 */
186 if (argc <= 4) {
187 len = fdt_totalsize(working_fdt);
188 } else {
189 len = simple_strtoul(argv[4], NULL, 16);
190 if (len < fdt_totalsize(working_fdt)) {
191 printf ("New length 0x%X < existing length "
192 "0x%X, aborting.\n",
193 len, fdt_totalsize(working_fdt));
194 return 1;
195 }
196 }
197
198 /*
199 * Copy to the new location.
200 */
201 err = fdt_open_into(working_fdt, newaddr, len);
202 if (err != 0) {
203 printf ("libfdt fdt_open_into(): %s\n",
204 fdt_strerror(err));
205 return 1;
206 }
207 working_fdt = newaddr;
208
209 /*
210 * Make a new node
211 */
212 } else if (strncmp(argv[1], "mk", 2) == 0) {
213 char *pathp; /* path */
214 char *nodep; /* new node to add */
215 int nodeoffset; /* node offset from libfdt */
216 int err;
217
218 /*
219 * Parameters: Node path, new node to be appended to the path.
220 */
221 if (argc < 4)
222 return CMD_RET_USAGE;
223
224 pathp = argv[2];
225 nodep = argv[3];
226
227 nodeoffset = fdt_path_offset (working_fdt, pathp);
228 if (nodeoffset < 0) {
229 /*
230 * Not found or something else bad happened.
231 */
232 printf ("libfdt fdt_path_offset() returned %s\n",
233 fdt_strerror(nodeoffset));
234 return 1;
235 }
236 err = fdt_add_subnode(working_fdt, nodeoffset, nodep);
237 if (err < 0) {
238 printf ("libfdt fdt_add_subnode(): %s\n",
239 fdt_strerror(err));
240 return 1;
241 }
242
243 /*
244 * Set the value of a property in the working_fdt.
245 */
246 } else if (argv[1][0] == 's') {
247 char *pathp; /* path */
248 char *prop; /* property */
249 int nodeoffset; /* node offset from libfdt */
250 static char data[SCRATCHPAD]; /* storage for the property */
251 int len; /* new length of the property */
252 int ret; /* return value */
253
254 /*
255 * Parameters: Node path, property, optional value.
256 */
257 if (argc < 4)
258 return CMD_RET_USAGE;
259
260 pathp = argv[2];
261 prop = argv[3];
262 if (argc == 4) {
263 len = 0;
264 } else {
265 ret = fdt_parse_prop(&argv[4], argc - 4, data, &len);
266 if (ret != 0)
267 return ret;
268 }
269
270 nodeoffset = fdt_path_offset (working_fdt, pathp);
271 if (nodeoffset < 0) {
272 /*
273 * Not found or something else bad happened.
274 */
275 printf ("libfdt fdt_path_offset() returned %s\n",
276 fdt_strerror(nodeoffset));
277 return 1;
278 }
279
280 ret = fdt_setprop(working_fdt, nodeoffset, prop, data, len);
281 if (ret < 0) {
282 printf ("libfdt fdt_setprop(): %s\n", fdt_strerror(ret));
283 return 1;
284 }
285
286 /********************************************************************
287 * Get the value of a property in the working_fdt.
288 ********************************************************************/
289 } else if (argv[1][0] == 'g') {
290 char *subcmd; /* sub-command */
291 char *pathp; /* path */
292 char *prop; /* property */
293 char *var; /* variable to store result */
294 int nodeoffset; /* node offset from libfdt */
295 const void *nodep; /* property node pointer */
296 int len = 0; /* new length of the property */
297
298 /*
299 * Parameters: Node path, property, optional value.
300 */
301 if (argc < 5)
302 return CMD_RET_USAGE;
303
304 subcmd = argv[2];
305
306 if (argc < 6 && subcmd[0] != 's')
307 return CMD_RET_USAGE;
308
309 var = argv[3];
310 pathp = argv[4];
311 prop = argv[5];
312
313 nodeoffset = fdt_path_offset(working_fdt, pathp);
314 if (nodeoffset < 0) {
315 /*
316 * Not found or something else bad happened.
317 */
318 printf("libfdt fdt_path_offset() returned %s\n",
319 fdt_strerror(nodeoffset));
320 return 1;
321 }
322
323 if (subcmd[0] == 'n' || (subcmd[0] == 's' && argc == 5)) {
324 int reqIndex = -1;
325 int startDepth = fdt_node_depth(
326 working_fdt, nodeoffset);
327 int curDepth = startDepth;
328 int curIndex = -1;
329 int nextNodeOffset = fdt_next_node(
330 working_fdt, nodeoffset, &curDepth);
331
332 if (subcmd[0] == 'n')
333 reqIndex = simple_strtoul(argv[5], NULL, 16);
334
335 while (curDepth > startDepth) {
336 if (curDepth == startDepth + 1)
337 curIndex++;
338 if (subcmd[0] == 'n' && curIndex == reqIndex) {
339 const char *nodeName = fdt_get_name(
340 working_fdt, nextNodeOffset, NULL);
341
342 setenv(var, (char *)nodeName);
343 return 0;
344 }
345 nextNodeOffset = fdt_next_node(
346 working_fdt, nextNodeOffset, &curDepth);
347 if (nextNodeOffset < 0)
348 break;
349 }
350 if (subcmd[0] == 's') {
351 /* get the num nodes at this level */
352 setenv_ulong(var, curIndex + 1);
353 } else {
354 /* node index not found */
355 printf("libfdt node not found\n");
356 return 1;
357 }
358 } else {
359 nodep = fdt_getprop(
360 working_fdt, nodeoffset, prop, &len);
361 if (len == 0) {
362 /* no property value */
363 setenv(var, "");
364 return 0;
365 } else if (len > 0) {
366 if (subcmd[0] == 'v') {
367 int ret;
368
369 ret = fdt_value_setenv(nodep, len, var);
370 if (ret != 0)
371 return ret;
372 } else if (subcmd[0] == 'a') {
373 /* Get address */
374 char buf[11];
375
376 sprintf(buf, "0x%p", nodep);
377 setenv(var, buf);
378 } else if (subcmd[0] == 's') {
379 /* Get size */
380 char buf[11];
381
382 sprintf(buf, "0x%08X", len);
383 setenv(var, buf);
384 } else
385 return CMD_RET_USAGE;
386 return 0;
387 } else {
388 printf("libfdt fdt_getprop(): %s\n",
389 fdt_strerror(len));
390 return 1;
391 }
392 }
393
394 /*
395 * Print (recursive) / List (single level)
396 */
397 } else if ((argv[1][0] == 'p') || (argv[1][0] == 'l')) {
398 int depth = MAX_LEVEL; /* how deep to print */
399 char *pathp; /* path */
400 char *prop; /* property */
401 int ret; /* return value */
402 static char root[2] = "/";
403
404 /*
405 * list is an alias for print, but limited to 1 level
406 */
407 if (argv[1][0] == 'l') {
408 depth = 1;
409 }
410
411 /*
412 * Get the starting path. The root node is an oddball,
413 * the offset is zero and has no name.
414 */
415 if (argc == 2)
416 pathp = root;
417 else
418 pathp = argv[2];
419 if (argc > 3)
420 prop = argv[3];
421 else
422 prop = NULL;
423
424 ret = fdt_print(pathp, prop, depth);
425 if (ret != 0)
426 return ret;
427
428 /*
429 * Remove a property/node
430 */
431 } else if (strncmp(argv[1], "rm", 2) == 0) {
432 int nodeoffset; /* node offset from libfdt */
433 int err;
434
435 /*
436 * Get the path. The root node is an oddball, the offset
437 * is zero and has no name.
438 */
439 nodeoffset = fdt_path_offset (working_fdt, argv[2]);
440 if (nodeoffset < 0) {
441 /*
442 * Not found or something else bad happened.
443 */
444 printf ("libfdt fdt_path_offset() returned %s\n",
445 fdt_strerror(nodeoffset));
446 return 1;
447 }
448 /*
449 * Do the delete. A fourth parameter means delete a property,
450 * otherwise delete the node.
451 */
452 if (argc > 3) {
453 err = fdt_delprop(working_fdt, nodeoffset, argv[3]);
454 if (err < 0) {
455 printf("libfdt fdt_delprop(): %s\n",
456 fdt_strerror(err));
457 return err;
458 }
459 } else {
460 err = fdt_del_node(working_fdt, nodeoffset);
461 if (err < 0) {
462 printf("libfdt fdt_del_node(): %s\n",
463 fdt_strerror(err));
464 return err;
465 }
466 }
467
468 /*
469 * Display header info
470 */
471 } else if (argv[1][0] == 'h') {
472 u32 version = fdt_version(working_fdt);
473 printf("magic:\t\t\t0x%x\n", fdt_magic(working_fdt));
474 printf("totalsize:\t\t0x%x (%d)\n", fdt_totalsize(working_fdt),
475 fdt_totalsize(working_fdt));
476 printf("off_dt_struct:\t\t0x%x\n",
477 fdt_off_dt_struct(working_fdt));
478 printf("off_dt_strings:\t\t0x%x\n",
479 fdt_off_dt_strings(working_fdt));
480 printf("off_mem_rsvmap:\t\t0x%x\n",
481 fdt_off_mem_rsvmap(working_fdt));
482 printf("version:\t\t%d\n", version);
483 printf("last_comp_version:\t%d\n",
484 fdt_last_comp_version(working_fdt));
485 if (version >= 2)
486 printf("boot_cpuid_phys:\t0x%x\n",
487 fdt_boot_cpuid_phys(working_fdt));
488 if (version >= 3)
489 printf("size_dt_strings:\t0x%x\n",
490 fdt_size_dt_strings(working_fdt));
491 if (version >= 17)
492 printf("size_dt_struct:\t\t0x%x\n",
493 fdt_size_dt_struct(working_fdt));
494 printf("number mem_rsv:\t\t0x%x\n",
495 fdt_num_mem_rsv(working_fdt));
496 printf("\n");
497
498 /*
499 * Set boot cpu id
500 */
501 } else if (strncmp(argv[1], "boo", 3) == 0) {
502 unsigned long tmp = simple_strtoul(argv[2], NULL, 16);
503 fdt_set_boot_cpuid_phys(working_fdt, tmp);
504
505 /*
506 * memory command
507 */
508 } else if (strncmp(argv[1], "me", 2) == 0) {
509 uint64_t addr, size;
510 int err;
511 addr = simple_strtoull(argv[2], NULL, 16);
512 size = simple_strtoull(argv[3], NULL, 16);
513 err = fdt_fixup_memory(working_fdt, addr, size);
514 if (err < 0)
515 return err;
516
517 /*
518 * mem reserve commands
519 */
520 } else if (strncmp(argv[1], "rs", 2) == 0) {
521 if (argv[2][0] == 'p') {
522 uint64_t addr, size;
523 int total = fdt_num_mem_rsv(working_fdt);
524 int j, err;
525 printf("index\t\t start\t\t size\n");
526 printf("-------------------------------"
527 "-----------------\n");
528 for (j = 0; j < total; j++) {
529 err = fdt_get_mem_rsv(working_fdt, j, &addr, &size);
530 if (err < 0) {
531 printf("libfdt fdt_get_mem_rsv(): %s\n",
532 fdt_strerror(err));
533 return err;
534 }
535 printf(" %x\t%08x%08x\t%08x%08x\n", j,
536 (u32)(addr >> 32),
537 (u32)(addr & 0xffffffff),
538 (u32)(size >> 32),
539 (u32)(size & 0xffffffff));
540 }
541 } else if (argv[2][0] == 'a') {
542 uint64_t addr, size;
543 int err;
544 addr = simple_strtoull(argv[3], NULL, 16);
545 size = simple_strtoull(argv[4], NULL, 16);
546 err = fdt_add_mem_rsv(working_fdt, addr, size);
547
548 if (err < 0) {
549 printf("libfdt fdt_add_mem_rsv(): %s\n",
550 fdt_strerror(err));
551 return err;
552 }
553 } else if (argv[2][0] == 'd') {
554 unsigned long idx = simple_strtoul(argv[3], NULL, 16);
555 int err = fdt_del_mem_rsv(working_fdt, idx);
556
557 if (err < 0) {
558 printf("libfdt fdt_del_mem_rsv(): %s\n",
559 fdt_strerror(err));
560 return err;
561 }
562 } else {
563 /* Unrecognized command */
564 return CMD_RET_USAGE;
565 }
566 }
567 #ifdef CONFIG_OF_BOARD_SETUP
568 /* Call the board-specific fixup routine */
569 else if (strncmp(argv[1], "boa", 3) == 0)
570 ft_board_setup(working_fdt, gd->bd);
571 #endif
572 /* Create a chosen node */
573 else if (strncmp(argv[1], "cho", 3) == 0) {
574 unsigned long initrd_start = 0, initrd_end = 0;
575
576 if ((argc != 2) && (argc != 4))
577 return CMD_RET_USAGE;
578
579 if (argc == 4) {
580 initrd_start = simple_strtoul(argv[2], NULL, 16);
581 initrd_end = simple_strtoul(argv[3], NULL, 16);
582 }
583
584 fdt_chosen(working_fdt);
585 fdt_initrd(working_fdt, initrd_start, initrd_end);
586
587 #if defined(CONFIG_FIT_SIGNATURE)
588 } else if (strncmp(argv[1], "che", 3) == 0) {
589 int cfg_noffset;
590 int ret;
591 unsigned long addr;
592 struct fdt_header *blob;
593
594 if (!working_fdt)
595 return CMD_RET_FAILURE;
596
597 if (argc > 2) {
598 addr = simple_strtoul(argv[2], NULL, 16);
599 blob = map_sysmem(addr, 0);
600 } else {
601 blob = (struct fdt_header *)gd->fdt_blob;
602 }
603 if (!fdt_valid(&blob))
604 return 1;
605
606 gd->fdt_blob = blob;
607 cfg_noffset = fit_conf_get_node(working_fdt, NULL);
608 if (!cfg_noffset) {
609 printf("Could not find configuration node: %s\n",
610 fdt_strerror(cfg_noffset));
611 return CMD_RET_FAILURE;
612 }
613
614 ret = fit_config_verify(working_fdt, cfg_noffset);
615 if (ret == 0)
616 return CMD_RET_SUCCESS;
617 else
618 return CMD_RET_FAILURE;
619 #endif
620
621 }
622 /* resize the fdt */
623 else if (strncmp(argv[1], "re", 2) == 0) {
624 fdt_resize(working_fdt);
625 }
626 else {
627 /* Unrecognized command */
628 return CMD_RET_USAGE;
629 }
630
631 return 0;
632 }
633
634 /****************************************************************************/
635
636 /**
637 * fdt_valid() - Check if an FDT is valid. If not, change it to NULL
638 *
639 * @blobp: Pointer to FDT pointer
640 * @return 1 if OK, 0 if bad (in which case *blobp is set to NULL)
641 */
642 static int fdt_valid(struct fdt_header **blobp)
643 {
644 const void *blob = *blobp;
645 int err;
646
647 if (blob == NULL) {
648 printf ("The address of the fdt is invalid (NULL).\n");
649 return 0;
650 }
651
652 err = fdt_check_header(blob);
653 if (err == 0)
654 return 1; /* valid */
655
656 if (err < 0) {
657 printf("libfdt fdt_check_header(): %s", fdt_strerror(err));
658 /*
659 * Be more informative on bad version.
660 */
661 if (err == -FDT_ERR_BADVERSION) {
662 if (fdt_version(blob) <
663 FDT_FIRST_SUPPORTED_VERSION) {
664 printf (" - too old, fdt %d < %d",
665 fdt_version(blob),
666 FDT_FIRST_SUPPORTED_VERSION);
667 }
668 if (fdt_last_comp_version(blob) >
669 FDT_LAST_SUPPORTED_VERSION) {
670 printf (" - too new, fdt %d > %d",
671 fdt_version(blob),
672 FDT_LAST_SUPPORTED_VERSION);
673 }
674 }
675 printf("\n");
676 *blobp = NULL;
677 return 0;
678 }
679 return 1;
680 }
681
682 /****************************************************************************/
683
684 /*
685 * Parse the user's input, partially heuristic. Valid formats:
686 * <0x00112233 4 05> - an array of cells. Numbers follow standard
687 * C conventions.
688 * [00 11 22 .. nn] - byte stream
689 * "string" - If the the value doesn't start with "<" or "[", it is
690 * treated as a string. Note that the quotes are
691 * stripped by the parser before we get the string.
692 * newval: An array of strings containing the new property as specified
693 * on the command line
694 * count: The number of strings in the array
695 * data: A bytestream to be placed in the property
696 * len: The length of the resulting bytestream
697 */
698 static int fdt_parse_prop(char * const *newval, int count, char *data, int *len)
699 {
700 char *cp; /* temporary char pointer */
701 char *newp; /* temporary newval char pointer */
702 unsigned long tmp; /* holds converted values */
703 int stridx = 0;
704
705 *len = 0;
706 newp = newval[0];
707
708 /* An array of cells */
709 if (*newp == '<') {
710 newp++;
711 while ((*newp != '>') && (stridx < count)) {
712 /*
713 * Keep searching until we find that last ">"
714 * That way users don't have to escape the spaces
715 */
716 if (*newp == '\0') {
717 newp = newval[++stridx];
718 continue;
719 }
720
721 cp = newp;
722 tmp = simple_strtoul(cp, &newp, 0);
723 *(__be32 *)data = __cpu_to_be32(tmp);
724 data += 4;
725 *len += 4;
726
727 /* If the ptr didn't advance, something went wrong */
728 if ((newp - cp) <= 0) {
729 printf("Sorry, I could not convert \"%s\"\n",
730 cp);
731 return 1;
732 }
733
734 while (*newp == ' ')
735 newp++;
736 }
737
738 if (*newp != '>') {
739 printf("Unexpected character '%c'\n", *newp);
740 return 1;
741 }
742 } else if (*newp == '[') {
743 /*
744 * Byte stream. Convert the values.
745 */
746 newp++;
747 while ((stridx < count) && (*newp != ']')) {
748 while (*newp == ' ')
749 newp++;
750 if (*newp == '\0') {
751 newp = newval[++stridx];
752 continue;
753 }
754 if (!isxdigit(*newp))
755 break;
756 tmp = simple_strtoul(newp, &newp, 16);
757 *data++ = tmp & 0xFF;
758 *len = *len + 1;
759 }
760 if (*newp != ']') {
761 printf("Unexpected character '%c'\n", *newp);
762 return 1;
763 }
764 } else {
765 /*
766 * Assume it is one or more strings. Copy it into our
767 * data area for convenience (including the
768 * terminating '\0's).
769 */
770 while (stridx < count) {
771 size_t length = strlen(newp) + 1;
772 strcpy(data, newp);
773 data += length;
774 *len += length;
775 newp = newval[++stridx];
776 }
777 }
778 return 0;
779 }
780
781 /****************************************************************************/
782
783 /*
784 * Heuristic to guess if this is a string or concatenated strings.
785 */
786
787 static int is_printable_string(const void *data, int len)
788 {
789 const char *s = data;
790
791 /* zero length is not */
792 if (len == 0)
793 return 0;
794
795 /* must terminate with zero or '\n' */
796 if (s[len - 1] != '\0' && s[len - 1] != '\n')
797 return 0;
798
799 /* printable or a null byte (concatenated strings) */
800 while (((*s == '\0') || isprint(*s) || isspace(*s)) && (len > 0)) {
801 /*
802 * If we see a null, there are three possibilities:
803 * 1) If len == 1, it is the end of the string, printable
804 * 2) Next character also a null, not printable.
805 * 3) Next character not a null, continue to check.
806 */
807 if (s[0] == '\0') {
808 if (len == 1)
809 return 1;
810 if (s[1] == '\0')
811 return 0;
812 }
813 s++;
814 len--;
815 }
816
817 /* Not the null termination, or not done yet: not printable */
818 if (*s != '\0' || (len != 0))
819 return 0;
820
821 return 1;
822 }
823
824
825 /*
826 * Print the property in the best format, a heuristic guess. Print as
827 * a string, concatenated strings, a byte, word, double word, or (if all
828 * else fails) it is printed as a stream of bytes.
829 */
830 static void print_data(const void *data, int len)
831 {
832 int j;
833
834 /* no data, don't print */
835 if (len == 0)
836 return;
837
838 /*
839 * It is a string, but it may have multiple strings (embedded '\0's).
840 */
841 if (is_printable_string(data, len)) {
842 puts("\"");
843 j = 0;
844 while (j < len) {
845 if (j > 0)
846 puts("\", \"");
847 puts(data);
848 j += strlen(data) + 1;
849 data += strlen(data) + 1;
850 }
851 puts("\"");
852 return;
853 }
854
855 if ((len %4) == 0) {
856 if (len > CONFIG_CMD_FDT_MAX_DUMP)
857 printf("* 0x%p [0x%08x]", data, len);
858 else {
859 const __be32 *p;
860
861 printf("<");
862 for (j = 0, p = data; j < len/4; j++)
863 printf("0x%08x%s", fdt32_to_cpu(p[j]),
864 j < (len/4 - 1) ? " " : "");
865 printf(">");
866 }
867 } else { /* anything else... hexdump */
868 if (len > CONFIG_CMD_FDT_MAX_DUMP)
869 printf("* 0x%p [0x%08x]", data, len);
870 else {
871 const u8 *s;
872
873 printf("[");
874 for (j = 0, s = data; j < len; j++)
875 printf("%02x%s", s[j], j < len - 1 ? " " : "");
876 printf("]");
877 }
878 }
879 }
880
881 /****************************************************************************/
882
883 /*
884 * Recursively print (a portion of) the working_fdt. The depth parameter
885 * determines how deeply nested the fdt is printed.
886 */
887 static int fdt_print(const char *pathp, char *prop, int depth)
888 {
889 static char tabs[MAX_LEVEL+1] =
890 "\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t"
891 "\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t";
892 const void *nodep; /* property node pointer */
893 int nodeoffset; /* node offset from libfdt */
894 int nextoffset; /* next node offset from libfdt */
895 uint32_t tag; /* tag */
896 int len; /* length of the property */
897 int level = 0; /* keep track of nesting level */
898 const struct fdt_property *fdt_prop;
899
900 nodeoffset = fdt_path_offset (working_fdt, pathp);
901 if (nodeoffset < 0) {
902 /*
903 * Not found or something else bad happened.
904 */
905 printf ("libfdt fdt_path_offset() returned %s\n",
906 fdt_strerror(nodeoffset));
907 return 1;
908 }
909 /*
910 * The user passed in a property as well as node path.
911 * Print only the given property and then return.
912 */
913 if (prop) {
914 nodep = fdt_getprop (working_fdt, nodeoffset, prop, &len);
915 if (len == 0) {
916 /* no property value */
917 printf("%s %s\n", pathp, prop);
918 return 0;
919 } else if (len > 0) {
920 printf("%s = ", prop);
921 print_data (nodep, len);
922 printf("\n");
923 return 0;
924 } else {
925 printf ("libfdt fdt_getprop(): %s\n",
926 fdt_strerror(len));
927 return 1;
928 }
929 }
930
931 /*
932 * The user passed in a node path and no property,
933 * print the node and all subnodes.
934 */
935 while(level >= 0) {
936 tag = fdt_next_tag(working_fdt, nodeoffset, &nextoffset);
937 switch(tag) {
938 case FDT_BEGIN_NODE:
939 pathp = fdt_get_name(working_fdt, nodeoffset, NULL);
940 if (level <= depth) {
941 if (pathp == NULL)
942 pathp = "/* NULL pointer error */";
943 if (*pathp == '\0')
944 pathp = "/"; /* root is nameless */
945 printf("%s%s {\n",
946 &tabs[MAX_LEVEL - level], pathp);
947 }
948 level++;
949 if (level >= MAX_LEVEL) {
950 printf("Nested too deep, aborting.\n");
951 return 1;
952 }
953 break;
954 case FDT_END_NODE:
955 level--;
956 if (level <= depth)
957 printf("%s};\n", &tabs[MAX_LEVEL - level]);
958 if (level == 0) {
959 level = -1; /* exit the loop */
960 }
961 break;
962 case FDT_PROP:
963 fdt_prop = fdt_offset_ptr(working_fdt, nodeoffset,
964 sizeof(*fdt_prop));
965 pathp = fdt_string(working_fdt,
966 fdt32_to_cpu(fdt_prop->nameoff));
967 len = fdt32_to_cpu(fdt_prop->len);
968 nodep = fdt_prop->data;
969 if (len < 0) {
970 printf ("libfdt fdt_getprop(): %s\n",
971 fdt_strerror(len));
972 return 1;
973 } else if (len == 0) {
974 /* the property has no value */
975 if (level <= depth)
976 printf("%s%s;\n",
977 &tabs[MAX_LEVEL - level],
978 pathp);
979 } else {
980 if (level <= depth) {
981 printf("%s%s = ",
982 &tabs[MAX_LEVEL - level],
983 pathp);
984 print_data (nodep, len);
985 printf(";\n");
986 }
987 }
988 break;
989 case FDT_NOP:
990 printf("%s/* NOP */\n", &tabs[MAX_LEVEL - level]);
991 break;
992 case FDT_END:
993 return 1;
994 default:
995 if (level <= depth)
996 printf("Unknown tag 0x%08X\n", tag);
997 return 1;
998 }
999 nodeoffset = nextoffset;
1000 }
1001 return 0;
1002 }
1003
1004 /********************************************************************/
1005 #ifdef CONFIG_SYS_LONGHELP
1006 static char fdt_help_text[] =
1007 "addr [-c] <addr> [<length>] - Set the [control] fdt location to <addr>\n"
1008 #ifdef CONFIG_OF_BOARD_SETUP
1009 "fdt boardsetup - Do board-specific set up\n"
1010 #endif
1011 "fdt move <fdt> <newaddr> <length> - Copy the fdt to <addr> and make it active\n"
1012 "fdt resize - Resize fdt to size + padding to 4k addr\n"
1013 "fdt print <path> [<prop>] - Recursive print starting at <path>\n"
1014 "fdt list <path> [<prop>] - Print one level starting at <path>\n"
1015 "fdt get value <var> <path> <prop> - Get <property> and store in <var>\n"
1016 "fdt get name <var> <path> <index> - Get name of node <index> and store in <var>\n"
1017 "fdt get addr <var> <path> <prop> - Get start address of <property> and store in <var>\n"
1018 "fdt get size <var> <path> [<prop>] - Get size of [<property>] or num nodes and store in <var>\n"
1019 "fdt set <path> <prop> [<val>] - Set <property> [to <val>]\n"
1020 "fdt mknode <path> <node> - Create a new node after <path>\n"
1021 "fdt rm <path> [<prop>] - Delete the node or <property>\n"
1022 "fdt header - Display header info\n"
1023 "fdt bootcpu <id> - Set boot cpuid\n"
1024 "fdt memory <addr> <size> - Add/Update memory node\n"
1025 "fdt rsvmem print - Show current mem reserves\n"
1026 "fdt rsvmem add <addr> <size> - Add a mem reserve\n"
1027 "fdt rsvmem delete <index> - Delete a mem reserves\n"
1028 "fdt chosen [<start> <end>] - Add/update the /chosen branch in the tree\n"
1029 " <start>/<end> - initrd start/end addr\n"
1030 #if defined(CONFIG_FIT_SIGNATURE)
1031 "fdt checksign [<addr>] - check FIT signature\n"
1032 " <start> - addr of key blob\n"
1033 " default gd->fdt_blob\n"
1034 #endif
1035 "NOTE: Dereference aliases by omiting the leading '/', "
1036 "e.g. fdt print ethernet0.";
1037 #endif
1038
1039 U_BOOT_CMD(
1040 fdt, 255, 0, do_fdt,
1041 "flattened device tree utility commands", fdt_help_text
1042 );
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