summaryrefslogtreecommitdiffstats
path: root/common/cmd_fdt.c
blob: 08fe3512d4fe6ff8f3a95c328413c4f352d8f4ae (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
/*
 * (C) Copyright 2007
 * Gerald Van Baren, Custom IDEAS, vanbaren@cideas.com
 * Based on code written by:
 *   Pantelis Antoniou <pantelis.antoniou@gmail.com> and
 *   Matthew McClintock <msm@freescale.com>
 *
 * See file CREDITS for list of people who contributed to this
 * project.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of
 * the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
 * MA 02111-1307 USA
 */

#include <common.h>
#include <command.h>
#include <linux/ctype.h>
#include <linux/types.h>

#ifdef CONFIG_OF_LIBFDT

#include <asm/global_data.h>
#include <fdt.h>
#include <libfdt.h>
#include <fdt_support.h>

#define MAX_LEVEL	32		/* how deeply nested we will go */
#define SCRATCHPAD	1024	/* bytes of scratchpad memory */

/*
 * Global data (for the gd->bd)
 */
DECLARE_GLOBAL_DATA_PTR;

/*
 * Scratchpad memory.
 */
static char data[SCRATCHPAD];


/*
 * Function prototypes/declarations.
 */
static int fdt_valid(void);
static void print_data(const void *data, int len);


/*
 * Flattened Device Tree command, see the help for parameter definitions.
 */
int do_fdt (cmd_tbl_t * cmdtp, int flag, int argc, char *argv[])
{
	char		op;

	if (argc < 2) {
		printf ("Usage:\n%s\n", cmdtp->usage);
		return 1;
	}

	/*
	 * Figure out which subcommand was given
	 */
	op = argv[1][0];
	/********************************************************************
	 * Set the address of the fdt
	 ********************************************************************/
	if (op == 'a') {
		/*
		 * Set the address [and length] of the fdt.
		 */
		fdt = (struct fdt_header *)simple_strtoul(argv[2], NULL, 16);

		if (!fdt_valid()) {
			return 1;
		}

		if (argc >= 4) {
			int  len;
			int  err;
			/*
			 * Optional new length
			 */
			len =  simple_strtoul(argv[3], NULL, 16);
			if (len < fdt_totalsize(fdt)) {
				printf ("New length %d < existing length %d, ignoring.\n",
					len, fdt_totalsize(fdt));
			} else {
				/*
				 * Open in place with a new length.
				 */
				err = fdt_open_into(fdt, fdt, len);
				if (err != 0) {
					printf ("libfdt: %s\n", fdt_strerror(err));
				}
			}
		}

	/********************************************************************
	 * Move the fdt
	 ********************************************************************/
	} else if (op == 'm') {
		struct fdt_header *newaddr;
		int  len;
		int  err;

		if (argc != 5) {
			printf ("Usage:\n%s\n", cmdtp->usage);
			return 1;
		}

		/*
		 * Set the address and length of the fdt.
		 */
		fdt = (struct fdt_header *)simple_strtoul(argv[2], NULL, 16);
		if (!fdt_valid()) {
			return 1;
		}

		newaddr = (struct fdt_header *)simple_strtoul(argv[3], NULL, 16);
		len     =  simple_strtoul(argv[4], NULL, 16);
		if (len < fdt_totalsize(fdt)) {
			printf ("New length %d < existing length %d, aborting.\n",
				len, fdt_totalsize(fdt));
			return 1;
		}

		/*
		 * Copy to the new location.
		 */
		err = fdt_open_into(fdt, newaddr, len);
		if (err != 0) {
			printf ("libfdt: %s\n", fdt_strerror(err));
			return 1;
		}
		fdt = newaddr;

	/********************************************************************
	 * Set the value of a node in the fdt.
	 ********************************************************************/
	} else if (op == 's') {
		char *pathp;		/* path */
		char *prop;			/* property */
		struct fdt_property *nodep;	/* node struct pointer */
		char *newval;		/* value from the user (as a string) */
		char *vp;			/* temporary value pointer */
		char *cp;			/* temporary char pointer */
		int  nodeoffset;	/* node offset from libfdt */
		int  len;			/* new length of the property */
		int  oldlen;		/* original length of the property */
		unsigned long tmp;	/* holds converted values */
		int  ret;			/* return value */

		/*
		 * Parameters: Node path, property, value.
		 */
		if (argc < 5) {
			printf ("Usage:\n%s\n", cmdtp->usage);
			return 1;
		}

		pathp  = argv[2];
		prop   = argv[3];
		newval = argv[4];

		if (strcmp(pathp, "/") == 0) {
			nodeoffset = 0;
		} else {
			nodeoffset = fdt_path_offset (fdt, pathp);
			if (nodeoffset < 0) {
				/*
			 	 * Not found or something else bad happened.
			 	 */
				printf ("libfdt: %s\n", fdt_strerror(nodeoffset));
				return 1;
			}
		}
		nodep = fdt_getprop (fdt, nodeoffset, prop, &oldlen);
		if (oldlen < 0) {
			printf ("libfdt %s\n", fdt_strerror(oldlen));
			return 1;
		} else if (oldlen == 0) {
			/*
			 * The specified property has no value
			 */
			printf("%s has no value, cannot set one (yet).\n", prop);
			return 1;
		} else {
			/*
			 * Convert the new property
			 */
			vp = data;
			if (*newval == '<') {
				/*
				 * Bigger values than bytes.
				 */
				len = 0;
				newval++;
				while ((*newval != '>') && (*newval != '\0')) {
					cp = newval;
					tmp = simple_strtoul(cp, &newval, 16);
					if ((newval - cp) <= 2) {
						*vp = tmp & 0xFF;
						vp  += 1;
						len += 1;
					} else if ((newval - cp) <= 4) {
						*(uint16_t *)vp = __cpu_to_be16(tmp);
						vp  += 2;
						len += 2;
					} else if ((newval - cp) <= 8) {
						*(uint32_t *)vp = __cpu_to_be32(tmp);
						vp  += 4;
						len += 4;
					} else {
						printf("Sorry, I could not convert \"%s\"\n", cp);
						return 1;
					}
					while (*newval == ' ')
						newval++;
				}
				if (*newval != '>') {
					printf("Unexpected character '%c'\n", *newval);
					return 1;
				}
			} else if (*newval == '[') {
				/*
				 * Byte stream.  Convert the values.
				 */
				len = 0;
				newval++;
				while ((*newval != ']') && (*newval != '\0')) {
					tmp = simple_strtoul(newval, &newval, 16);
					*vp++ = tmp & 0xFF;
					len++;
					while (*newval == ' ')
						newval++;
				}
				if (*newval != ']') {
					printf("Unexpected character '%c'\n", *newval);
					return 1;
				}
			} else {
				/*
				 * Assume it is a string.  Copy it into our data area for
				 * convenience (including the terminating '\0').
				 */
				len = strlen(newval) + 1;
				strcpy(data, newval);
			}

			ret = fdt_setprop(fdt, nodeoffset, prop, data, len);
			if (ret < 0) {
				printf ("libfdt %s\n", fdt_strerror(ret));
				return 1;
			}
		}

	/********************************************************************
	 * Print (recursive) / List (single level)
	 ********************************************************************/
	} else if ((op == 'p') || (op == 'l')) {
		/*
		 * Recursively print (a portion of) the fdt.
		 */
		static int offstack[MAX_LEVEL];
		static char tabs[MAX_LEVEL+1] = "\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t";
		int depth = MAX_LEVEL;	/* how deep to print */
		char *pathp;		/* path */
		char *prop;			/* property */
		void *nodep;		/* property node pointer */
		int  nodeoffset;	/* node offset from libfdt */
		int  nextoffset;	/* next node offset from libfdt */
		uint32_t tag;		/* tag */
		int  len;			/* length of the property */
		int  level = 0;		/* keep track of nesting level */

		/*
		 * list is an alias for print, but limited to 1 level
		 */
		if (op == 'l') {
			depth = 1;
		}

		/*
		 * Get the starting path.  The root node is an oddball,
		 * the offset is zero and has no name.
		 */
		pathp = argv[2];
		if (argc > 3)
			prop = argv[3];
		else
			prop = NULL;

		if (strcmp(pathp, "/") == 0) {
			nodeoffset = 0;
			printf("/");
		} else {
			nodeoffset = fdt_path_offset (fdt, pathp);
			if (nodeoffset < 0) {
				/*
				 * Not found or something else bad happened.
				 */
				printf ("libfdt %s\n", fdt_strerror(nodeoffset));
				return 1;
			}
		}
		/*
		 * The user passed in a property as well as node path.  Print only
		 * the given property and then return.
		 */
		if (prop) {
			nodep = fdt_getprop (fdt, nodeoffset, prop, &len);
			if (len == 0) {
				printf("%s %s\n", pathp, prop);	/* no property value */
				return 0;
			} else if (len > 0) {
				printf("%s=", prop);
				print_data (nodep, len);
				printf("\n");
				return 0;
			} else {
				printf ("libfdt %s\n", fdt_strerror(len));
				return 1;
			}
		}

		/*
		 * The user passed in a node path and no property, print the node
		 * and all subnodes.
		 */
		offstack[0] = nodeoffset;

		while(level >= 0) {
			tag = fdt_next_tag(fdt, nodeoffset, &nextoffset, &pathp);
			switch(tag) {
			case FDT_BEGIN_NODE:
				if(level <= depth)
					printf("%s%s {\n", &tabs[MAX_LEVEL - level], pathp);
				level++;
				offstack[level] = nodeoffset;
				if (level >= MAX_LEVEL) {
					printf("Aaaiii <splat> nested too deep.\n");
					return 1;
				}
				break;
			case FDT_END_NODE:
				level--;
				if(level <= depth)
					printf("%s};\n", &tabs[MAX_LEVEL - level]);
				if (level == 0) {
					level = -1;		/* exit the loop */
				}
				break;
			case FDT_PROP:
				nodep = fdt_getprop (fdt, offstack[level], pathp, &len);
				if (len < 0) {
					printf ("libfdt %s\n", fdt_strerror(len));
					return 1;
				} else if (len == 0) {
					/* the property has no value */
					if(level <= depth)
						printf("%s%s;\n", &tabs[MAX_LEVEL - level], pathp);
				} else {
					if(level <= depth) {
						printf("%s%s=", &tabs[MAX_LEVEL - level], pathp);
						print_data (nodep, len);
						printf(";\n");
					}
				}
				break;
			case FDT_NOP:
				break;
			case FDT_END:
				return 1;
			default:
				if(level <= depth)
					printf("Unknown tag 0x%08X\n", tag);
				return 1;
			}
			nodeoffset = nextoffset;
		}

	/********************************************************************
	 * Remove a property/node
	 ********************************************************************/
	} else if (op == 'r') {
		int  nodeoffset;	/* node offset from libfdt */
		int  err;

		/*
		 * Get the path.  The root node is an oddball, the offset
		 * is zero and has no name.
		 */
		if (strcmp(argv[2], "/") == 0) {
			nodeoffset = 0;
		} else {
			nodeoffset = fdt_path_offset (fdt, argv[2]);
			if (nodeoffset < 0) {
				/*
				 * Not found or something else bad happened.
				 */
				printf ("libfdt %s\n", fdt_strerror(nodeoffset));
				return 1;
			}
		}
		/*
		 * Do the delete.  A fourth parameter means delete a property,
		 * otherwise delete the node.
		 */
		if (argc > 3) {
			err = fdt_delprop(fdt, nodeoffset, argv[3]);
			if (err < 0) {
				printf("fdt_delprop libfdt: %s\n", fdt_strerror(err));
				return err;
			}
		} else {
			err = fdt_del_node(fdt, nodeoffset);
			if (err < 0) {
				printf("fdt_del_node libfdt: %s\n", fdt_strerror(err));
				return err;
			}
		}

	/********************************************************************
	 * Create a chosen node
	 ********************************************************************/
	} else if (op == 'c') {
		fdt_chosen(fdt, 0, 0, 1);

	/********************************************************************
	 * Create a u-boot-env node
	 ********************************************************************/
	} else if (op == 'e') {
		fdt_env(fdt);

	/********************************************************************
	 * Create a bd_t node
	 ********************************************************************/
	} else if (op == 'b') {
		fdt_bd_t(fdt);

	/********************************************************************
	 * Unrecognized command
	 ********************************************************************/
	} else {
		printf ("Usage:\n%s\n", cmdtp->usage);
		return 1;
	}

	return 0;
}

/********************************************************************/

static int fdt_valid(void)
{
	int  err;

	if (fdt == NULL) {
		printf ("The address of the fdt is invalid (NULL).\n");
		return 0;
	}

	err = fdt_check_header(fdt);
	if (err == 0)
		return 1;	/* valid */

	if (err < 0) {
		printf("libfdt: %s", fdt_strerror(err));
		/*
		 * Be more informative on bad version.
		 */
		if (err == -FDT_ERR_BADVERSION) {
			if (fdt_version(fdt) < FDT_FIRST_SUPPORTED_VERSION) {
				printf (" - too old, fdt $d < %d",
					fdt_version(fdt), FDT_FIRST_SUPPORTED_VERSION);
				fdt = NULL;
			}
			if (fdt_last_comp_version(fdt) > FDT_LAST_SUPPORTED_VERSION) {
				printf (" - too new, fdt $d > %d",
					fdt_version(fdt), FDT_LAST_SUPPORTED_VERSION);
				fdt = NULL;
			}
			return 0;
		}
		printf("\n");
		return 0;
	}
	return 1;
}

/********************************************************************/

/*
 * OF flat tree handling
 * Written by: Pantelis Antoniou <pantelis.antoniou@gmail.com>
 * Updated by: Matthew McClintock <msm@freescale.com>
 * Converted to libfdt by: Gerald Van Baren <vanbaren@cideas.com>
 */

static int is_printable_string(const void *data, int len)
{
	const char *s = data;

	/* zero length is not */
	if (len == 0)
		return 0;

	/* must terminate with zero */
	if (s[len - 1] != '\0')
		return 0;

	/* printable or a null byte (concatenated strings) */
	while (((*s == '\0') || isprint(*s)) && (len > 0)) {
		/*
		 * If we see a null, there are three possibilities:
		 * 1) If len == 1, it is the end of the string, printable
		 * 2) Next character also a null, not printable.
		 * 3) Next character not a null, continue to check.
		 */
		if (s[0] == '\0') {
			if (len == 1)
				return 1;
			if (s[1] == '\0')
				return 0;
		}
		s++;
		len--;
	}

	/* Not the null termination, or not done yet: not printable */
	if (*s != '\0' || (len != 0))
		return 0;

	return 1;
}

static void print_data(const void *data, int len)
{
	int j;
	const u8 *s;

	/* no data, don't print */
	if (len == 0)
		return;

	/*
	 * It is a string, but it may have multiple strings (embedded '\0's).
	 */
	if (is_printable_string(data, len)) {
		puts("\"");
		j = 0;
		while (j < len) {
			if (j > 0)
				puts("\", \"");
			puts(data);
			j    += strlen(data) + 1;
			data += strlen(data) + 1;
		}
		puts("\"");
		return;
	}

	switch (len) {
	case 1:	 /* byte */
		printf("<%02x>", (*(u8 *) data) & 0xff);
		break;
	case 2:	 /* half-word */
		printf("<%04x>", be16_to_cpu(*(u16 *) data) & 0xffff);
		break;
	case 4:	 /* word */
		printf("<%08x>", be32_to_cpu(*(u32 *) data) & 0xffffffffU);
		break;
	case 8:	 /* double-word */
#if __WORDSIZE == 64
		printf("<%016llx>", be64_to_cpu(*(uint64_t *) data));
#else
		printf("<%08x ", be32_to_cpu(*(u32 *) data) & 0xffffffffU);
		data += 4;
		printf("%08x>", be32_to_cpu(*(u32 *) data) & 0xffffffffU);
#endif
		break;
	default:		/* anything else... hexdump */
		printf("[");
		for (j = 0, s = data; j < len; j++)
			printf("%02x%s", s[j], j < len - 1 ? " " : "");
		printf("]");

		break;
	}
}

/********************************************************************/

U_BOOT_CMD(
	fdt,	5,	0,	do_fdt,
	"fdt     - flattened device tree utility commands\n",
	    "addr   <addr> [<length>]        - Set the fdt location to <addr>\n"
	"fdt move   <fdt> <newaddr> <length> - Copy the fdt to <addr>\n"
	"fdt print  <path> [<prop>]          - Recursive print starting at <path>\n"
	"fdt list   <path> [<prop>]          - Print one level starting at <path>\n"
	"fdt set    <path> <prop> [<val>]    - Set <property> [to <val>]\n"
	"fdt mknode <path> <node>            - Create a new node after <path>\n"
	"fdt rm     <path> [<prop>]          - Delete the node or <property>\n"
	"fdt chosen - Add/update the \"/chosen\" branch in the tree\n"
#ifdef CONFIG_OF_HAS_UBOOT_ENV
	"fdt env    - Add/replace the \"/u-boot-env\" branch in the tree\n"
#endif
#ifdef CONFIG_OF_HAS_BD_T
	"fdt bd_t   - Add/replace the \"/bd_t\" branch in the tree\n"
#endif
	"Hints:\n"
	" * Set a larger length with the fdt addr command to add to the blob.\n"
	" * If the property you are setting/printing has a '#' character,\n"
	"     you MUST escape it with a \\ character or quote it with \" or\n"
	"     it will be ignored as a comment.\n"
	" * If the value has spaces in it, you MUST escape the spaces with\n"
	"     \\ characters or quote it with \"\"\n"
	"Examples: fdt print /               # print the whole tree\n"
	"          fdt print /cpus \"#address-cells\"\n"
	"          fdt set   /cpus \"#address-cells\" \"[00 00 00 01]\"\n"
);

#endif /* CONFIG_OF_LIBFDT */
OpenPOWER on IntegriCloud