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  * See file CREDITS for list of people who contributed to this
   9  * project.
  10  *
  11  * This program is free software; you can redistribute it and/or
  12  * modify it under the terms of the GNU General Public License as
  13  * published by the Free Software Foundation; either version 2 of
  14  * the License, or (at your option) any later version.
  15  *
  16  * This program is distributed in the hope that it will be useful,
  17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19  * GNU General Public License for more details.
  20  *
  21  * You should have received a copy of the GNU General Public License
  22  * along with this program; if not, write to the Free Software
  23  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  24  * MA 02111-1307 USA
  25  */
  26
  27 #include <common.h>
  28 #include <command.h>
  29 #include <linux/ctype.h>
  30 #include <linux/types.h>
  31 #include <asm/global_data.h>
  32 #include <fdt.h>
  33 #include <libfdt.h>
  34 #include <fdt_support.h>
  35
  36 #define MAX_LEVEL       32              /* how deeply nested we will go */
  37 #define SCRATCHPAD      1024            /* bytes of scratchpad memory */
  38
  39 /*
  40  * Global data (for the gd->bd)
  41  */
  42 DECLARE_GLOBAL_DATA_PTR;
  43
  44 static int fdt_valid(void);
  45 static int fdt_parse_prop(char **newval, int count, char *data, int *len);
  46 static int fdt_print(const char *pathp, char *prop, int depth);
  47
  48 /*
  49  * Flattened Device Tree command, see the help for parameter definitions.
  50  */
  51 int do_fdt (cmd_tbl_t * cmdtp, int flag, int argc, char *argv[])
  52 {
  53         if (argc < 2) {
  54                 printf ("Usage:\n%s\n", cmdtp->usage);
  55                 return 1;
  56         }
  57
  58         /********************************************************************
  59          * Set the address of the fdt
  60          ********************************************************************/
  61         if (argv[1][0] == 'a') {
  62                 /*
  63                  * Set the address [and length] of the fdt.
  64                  */
  65                 fdt = (struct fdt_header *)simple_strtoul(argv[2], NULL, 16);
  66
  67                 if (!fdt_valid()) {
  68                         return 1;
  69                 }
  70
  71                 if (argc >= 4) {
  72                         int  len;
  73                         int  err;
  74                         /*
  75                          * Optional new length
  76                          */
  77                         len = simple_strtoul(argv[3], NULL, 16);
  78                         if (len < fdt_totalsize(fdt)) {
  79                                 printf ("New length %d < existing length %d, "
  80                                         "ignoring.\n",
  81                                         len, fdt_totalsize(fdt));
  82                         } else {
  83                                 /*
  84                                  * Open in place with a new length.
  85                                  */
  86                                 err = fdt_open_into(fdt, fdt, len);
  87                                 if (err != 0) {
  88                                         printf ("libfdt fdt_open_into(): %s\n",
  89                                                 fdt_strerror(err));
  90                                 }
  91                         }
  92                 }
  93
  94         /********************************************************************
  95          * Move the fdt
  96          ********************************************************************/
  97         } else if ((argv[1][0] == 'm') && (argv[1][1] == 'o')) {
  98                 struct fdt_header *newaddr;
  99                 int  len;
 100                 int  err;
 101
 102                 if (argc < 4) {
 103                         printf ("Usage:\n%s\n", cmdtp->usage);
 104                         return 1;
 105                 }
 106
 107                 /*
 108                  * Set the address and length of the fdt.
 109                  */
 110                 fdt = (struct fdt_header *)simple_strtoul(argv[2], NULL, 16);
 111                 if (!fdt_valid()) {
 112                         return 1;
 113                 }
 114
 115                 newaddr = (struct fdt_header *)simple_strtoul(argv[3],NULL,16);
 116
 117                 /*
 118                  * If the user specifies a length, use that.  Otherwise use the
 119                  * current length.
 120                  */
 121                 if (argc <= 4) {
 122                         len = fdt_totalsize(fdt);
 123                 } else {
 124                         len = simple_strtoul(argv[4], NULL, 16);
 125                         if (len < fdt_totalsize(fdt)) {
 126                                 printf ("New length 0x%X < existing length "
 127                                         "0x%X, aborting.\n",
 128                                         len, fdt_totalsize(fdt));
 129                                 return 1;
 130                         }
 131                 }
 132
 133                 /*
 134                  * Copy to the new location.
 135                  */
 136                 err = fdt_open_into(fdt, newaddr, len);
 137                 if (err != 0) {
 138                         printf ("libfdt fdt_open_into(): %s\n",
 139                                 fdt_strerror(err));
 140                         return 1;
 141                 }
 142                 fdt = newaddr;
 143
 144         /********************************************************************
 145          * Make a new node
 146          ********************************************************************/
 147         } else if ((argv[1][0] == 'm') && (argv[1][1] == 'k')) {
 148                 char *pathp;            /* path */
 149                 char *nodep;            /* new node to add */
 150                 int  nodeoffset;        /* node offset from libfdt */
 151                 int  err;
 152
 153                 /*
 154                  * Parameters: Node path, new node to be appended to the path.
 155                  */
 156                 if (argc < 4) {
 157                         printf ("Usage:\n%s\n", cmdtp->usage);
 158                         return 1;
 159                 }
 160
 161                 pathp = argv[2];
 162                 nodep = argv[3];
 163
 164                 nodeoffset = fdt_path_offset (fdt, pathp);
 165                 if (nodeoffset < 0) {
 166                         /*
 167                          * Not found or something else bad happened.
 168                          */
 169                         printf ("libfdt fdt_path_offset() returned %s\n",
 170                                 fdt_strerror(nodeoffset));
 171                         return 1;
 172                 }
 173                 err = fdt_add_subnode(fdt, nodeoffset, nodep);
 174                 if (err < 0) {
 175                         printf ("libfdt fdt_add_subnode(): %s\n",
 176                                 fdt_strerror(err));
 177                         return 1;
 178                 }
 179
 180         /********************************************************************
 181          * Set the value of a property in the fdt.
 182          ********************************************************************/
 183         } else if (argv[1][0] == 's') {
 184                 char *pathp;            /* path */
 185                 char *prop;             /* property */
 186                 int  nodeoffset;        /* node offset from libfdt */
 187                 static char data[SCRATCHPAD];   /* storage for the property */
 188                 int  len;               /* new length of the property */
 189                 int  ret;               /* return value */
 190
 191                 /*
 192                  * Parameters: Node path, property, optional value.
 193                  */
 194                 if (argc < 4) {
 195                         printf ("Usage:\n%s\n", cmdtp->usage);
 196                         return 1;
 197                 }
 198
 199                 pathp  = argv[2];
 200                 prop   = argv[3];
 201                 if (argc == 4) {
 202                         len = 0;
 203                 } else {
 204                         ret = fdt_parse_prop(&argv[4], argc - 4, data, &len);
 205                         if (ret != 0)
 206                                 return ret;
 207                 }
 208
 209                 nodeoffset = fdt_path_offset (fdt, pathp);
 210                 if (nodeoffset < 0) {
 211                         /*
 212                          * Not found or something else bad happened.
 213                          */
 214                         printf ("libfdt fdt_path_offset() returned %s\n",
 215                                 fdt_strerror(nodeoffset));
 216                         return 1;
 217                 }
 218
 219                 ret = fdt_setprop(fdt, nodeoffset, prop, data, len);
 220                 if (ret < 0) {
 221                         printf ("libfdt fdt_setprop(): %s\n", fdt_strerror(ret));
 222                         return 1;
 223                 }
 224
 225         /********************************************************************
 226          * Print (recursive) / List (single level)
 227          ********************************************************************/
 228         } else if ((argv[1][0] == 'p') || (argv[1][0] == 'l')) {
 229                 int depth = MAX_LEVEL;  /* how deep to print */
 230                 char *pathp;            /* path */
 231                 char *prop;             /* property */
 232                 int  ret;               /* return value */
 233                 static char root[2] = "/";
 234
 235                 /*
 236                  * list is an alias for print, but limited to 1 level
 237                  */
 238                 if (argv[1][0] == 'l') {
 239                         depth = 1;
 240                 }
 241
 242                 /*
 243                  * Get the starting path.  The root node is an oddball,
 244                  * the offset is zero and has no name.
 245                  */
 246                 if (argc == 2)
 247                         pathp = root;
 248                 else
 249                         pathp = argv[2];
 250                 if (argc > 3)
 251                         prop = argv[3];
 252                 else
 253                         prop = NULL;
 254
 255                 ret = fdt_print(pathp, prop, depth);
 256                 if (ret != 0)
 257                         return ret;
 258
 259         /********************************************************************
 260          * Remove a property/node
 261          ********************************************************************/
 262         } else if ((argv[1][0] == 'r') && (argv[1][1] == 'm')) {
 263                 int  nodeoffset;        /* node offset from libfdt */
 264                 int  err;
 265
 266                 /*
 267                  * Get the path.  The root node is an oddball, the offset
 268                  * is zero and has no name.
 269                  */
 270                 nodeoffset = fdt_path_offset (fdt, argv[2]);
 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                  * Do the delete.  A fourth parameter means delete a property,
 281                  * otherwise delete the node.
 282                  */
 283                 if (argc > 3) {
 284                         err = fdt_delprop(fdt, nodeoffset, argv[3]);
 285                         if (err < 0) {
 286                                 printf("libfdt fdt_delprop():  %s\n",
 287                                         fdt_strerror(err));
 288                                 return err;
 289                         }
 290                 } else {
 291                         err = fdt_del_node(fdt, nodeoffset);
 292                         if (err < 0) {
 293                                 printf("libfdt fdt_del_node():  %s\n",
 294                                         fdt_strerror(err));
 295                                 return err;
 296                         }
 297                 }
 298
 299         /********************************************************************
 300          * Display header info
 301          ********************************************************************/
 302         } else if (argv[1][0] == 'h') {
 303                 u32 version = fdt_version(fdt);
 304                 printf("magic:\t\t\t0x%x\n", fdt_magic(fdt));
 305                 printf("totalsize:\t\t0x%x (%d)\n", fdt_totalsize(fdt), fdt_totalsize(fdt));
 306                 printf("off_dt_struct:\t\t0x%x\n", fdt_off_dt_struct(fdt));
 307                 printf("off_dt_strings:\t\t0x%x\n", fdt_off_dt_strings(fdt));
 308                 printf("off_mem_rsvmap:\t\t0x%x\n", fdt_off_mem_rsvmap(fdt));
 309                 printf("version:\t\t%d\n", version);
 310                 printf("last_comp_version:\t%d\n", fdt_last_comp_version(fdt));
 311                 if (version >= 2)
 312                         printf("boot_cpuid_phys:\t0x%x\n",
 313                                 fdt_boot_cpuid_phys(fdt));
 314                 if (version >= 3)
 315                         printf("size_dt_strings:\t0x%x\n",
 316                                 fdt_size_dt_strings(fdt));
 317                 if (version >= 17)
 318                         printf("size_dt_struct:\t\t0x%x\n",
 319                                 fdt_size_dt_struct(fdt));
 320                 printf("number mem_rsv:\t\t0x%x\n", fdt_num_mem_rsv(fdt));
 321                 printf("\n");
 322
 323         /********************************************************************
 324          * Set boot cpu id
 325          ********************************************************************/
 326         } else if ((argv[1][0] == 'b') && (argv[1][1] == 'o') &&
 327                    (argv[1][2] == 'o')) {
 328                 unsigned long tmp = simple_strtoul(argv[2], NULL, 16);
 329                 fdt_set_boot_cpuid_phys(fdt, tmp);
 330
 331         /********************************************************************
 332          * memory command
 333          ********************************************************************/
 334         } else if ((argv[1][0] == 'm') && (argv[1][1] == 'e')) {
 335                 uint64_t addr, size;
 336                 int err;
 337 #ifdef CFG_64BIT_STRTOUL
 338                         addr = simple_strtoull(argv[2], NULL, 16);
 339                         size = simple_strtoull(argv[3], NULL, 16);
 340 #else
 341                         addr = simple_strtoul(argv[2], NULL, 16);
 342                         size = simple_strtoul(argv[3], NULL, 16);
 343 #endif
 344                 err = fdt_fixup_memory(fdt, addr, size);
 345                 if (err < 0)
 346                         return err;
 347
 348         /********************************************************************
 349          * mem reserve commands
 350          ********************************************************************/
 351         } else if ((argv[1][0] == 'r') && (argv[1][1] == 's')) {
 352                 if (argv[2][0] == 'p') {
 353                         uint64_t addr, size;
 354                         int total = fdt_num_mem_rsv(fdt);
 355                         int j, err;
 356                         printf("index\t\t   start\t\t    size\n");
 357                         printf("-------------------------------"
 358                                 "-----------------\n");
 359                         for (j = 0; j < total; j++) {
 360                                 err = fdt_get_mem_rsv(fdt, j, &addr, &size);
 361                                 if (err < 0) {
 362                                         printf("libfdt fdt_get_mem_rsv():  %s\n",
 363                                                         fdt_strerror(err));
 364                                         return err;
 365                                 }
 366                                 printf("    %x\t%08x%08x\t%08x%08x\n", j,
 367                                         (u32)(addr >> 32),
 368                                         (u32)(addr & 0xffffffff),
 369                                         (u32)(size >> 32),
 370                                         (u32)(size & 0xffffffff));
 371                         }
 372                 } else if (argv[2][0] == 'a') {
 373                         uint64_t addr, size;
 374                         int err;
 375 #ifdef CFG_64BIT_STRTOUL
 376                         addr = simple_strtoull(argv[3], NULL, 16);
 377                         size = simple_strtoull(argv[4], NULL, 16);
 378 #else
 379                         addr = simple_strtoul(argv[3], NULL, 16);
 380                         size = simple_strtoul(argv[4], NULL, 16);
 381 #endif
 382                         err = fdt_add_mem_rsv(fdt, addr, size);
 383
 384                         if (err < 0) {
 385                                 printf("libfdt fdt_add_mem_rsv():  %s\n",
 386                                         fdt_strerror(err));
 387                                 return err;
 388                         }
 389                 } else if (argv[2][0] == 'd') {
 390                         unsigned long idx = simple_strtoul(argv[3], NULL, 16);
 391                         int err = fdt_del_mem_rsv(fdt, idx);
 392
 393                         if (err < 0) {
 394                                 printf("libfdt fdt_del_mem_rsv():  %s\n",
 395                                         fdt_strerror(err));
 396                                 return err;
 397                         }
 398                 } else {
 399                         /* Unrecognized command */
 400                         printf ("Usage:\n%s\n", cmdtp->usage);
 401                         return 1;
 402                 }
 403         }
 404 #ifdef CONFIG_OF_BOARD_SETUP
 405         /* Call the board-specific fixup routine */
 406         else if ((argv[1][0] == 'b') && (argv[1][1] == 'o') &&
 407                    (argv[1][2] == 'a'))
 408                 ft_board_setup(fdt, gd->bd);
 409 #endif
 410         /* Create a chosen node */
 411         else if (argv[1][0] == 'c')
 412                 fdt_chosen(fdt, 0, 0, 1);
 413         else {
 414                 /* Unrecognized command */
 415                 printf ("Usage:\n%s\n", cmdtp->usage);
 416                 return 1;
 417         }
 418
 419         return 0;
 420 }
 421
 422 /****************************************************************************/
 423
 424 static int fdt_valid(void)
 425 {
 426         int  err;
 427
 428         if (fdt == NULL) {
 429                 printf ("The address of the fdt is invalid (NULL).\n");
 430                 return 0;
 431         }
 432
 433         err = fdt_check_header(fdt);
 434         if (err == 0)
 435                 return 1;       /* valid */
 436
 437         if (err < 0) {
 438                 printf("libfdt fdt_check_header(): %s", fdt_strerror(err));
 439                 /*
 440                  * Be more informative on bad version.
 441                  */
 442                 if (err == -FDT_ERR_BADVERSION) {
 443                         if (fdt_version(fdt) < FDT_FIRST_SUPPORTED_VERSION) {
 444                                 printf (" - too old, fdt $d < %d",
 445                                         fdt_version(fdt),
 446                                         FDT_FIRST_SUPPORTED_VERSION);
 447                                 fdt = NULL;
 448                         }
 449                         if (fdt_last_comp_version(fdt) > FDT_LAST_SUPPORTED_VERSION) {
 450                                 printf (" - too new, fdt $d > %d",
 451                                         fdt_version(fdt),
 452                                         FDT_LAST_SUPPORTED_VERSION);
 453                                 fdt = NULL;
 454                         }
 455                         return 0;
 456                 }
 457                 printf("\n");
 458                 return 0;
 459         }
 460         return 1;
 461 }
 462
 463 /****************************************************************************/
 464
 465 /*
 466  * Parse the user's input, partially heuristic.  Valid formats:
 467  * <0x00112233 4 05>    - an array of cells.  Numbers follow standard
 468  *                      C conventions.
 469  * [00 11 22 .. nn] - byte stream
 470  * "string"     - If the the value doesn't start with "<" or "[", it is
 471  *                      treated as a string.  Note that the quotes are
 472  *                      stripped by the parser before we get the string.
 473  * newval: An array of strings containing the new property as specified
 474  *      on the command line
 475  * count: The number of strings in the array
 476  * data: A bytestream to be placed in the property
 477  * len: The length of the resulting bytestream
 478  */
 479 static int fdt_parse_prop(char **newval, int count, char *data, int *len)
 480 {
 481         char *cp;               /* temporary char pointer */
 482         char *newp;             /* temporary newval char pointer */
 483         unsigned long tmp;      /* holds converted values */
 484         int stridx = 0;
 485
 486         *len = 0;
 487         newp = newval[0];
 488
 489         /* An array of cells */
 490         if (*newp == '<') {
 491                 newp++;
 492                 while ((*newp != '>') && (stridx < count)) {
 493                         /*
 494                          * Keep searching until we find that last ">"
 495                          * That way users don't have to escape the spaces
 496                          */
 497                         if (*newp == '\0') {
 498                                 newp = newval[++stridx];
 499                                 continue;
 500                         }
 501
 502                         cp = newp;
 503                         tmp = simple_strtoul(cp, &newp, 0);
 504                         *(uint32_t *)data = __cpu_to_be32(tmp);
 505                         data  += 4;
 506                         *len += 4;
 507
 508                         /* If the ptr didn't advance, something went wrong */
 509                         if ((newp - cp) <= 0) {
 510                                 printf("Sorry, I could not convert \"%s\"\n",
 511                                         cp);
 512                                 return 1;
 513                         }
 514
 515                         while (*newp == ' ')
 516                                 newp++;
 517                 }
 518
 519                 if (*newp != '>') {
 520                         printf("Unexpected character '%c'\n", *newp);
 521                         return 1;
 522                 }
 523         } else if (*newp == '[') {
 524                 /*
 525                  * Byte stream.  Convert the values.
 526                  */
 527                 newp++;
 528                 while ((*newp != ']') && (stridx < count)) {
 529                         tmp = simple_strtoul(newp, &newp, 16);
 530                         *data++ = tmp & 0xFF;
 531                         *len    = *len + 1;
 532                         while (*newp == ' ')
 533                                 newp++;
 534                         if (*newp != '\0')
 535                                 newp = newval[++stridx];
 536                 }
 537                 if (*newp != ']') {
 538                         printf("Unexpected character '%c'\n", *newval);
 539                         return 1;
 540                 }
 541         } else {
 542                 /*
 543                  * Assume it is a string.  Copy it into our data area for
 544                  * convenience (including the terminating '\0').
 545                  */
 546                 while (stridx < count) {
 547                         *len = strlen(newp) + 1;
 548                         strcpy(data, newp);
 549                         newp = newval[++stridx];
 550                 }
 551         }
 552         return 0;
 553 }
 554
 555 /****************************************************************************/
 556
 557 /*
 558  * Heuristic to guess if this is a string or concatenated strings.
 559  */
 560
 561 static int is_printable_string(const void *data, int len)
 562 {
 563         const char *s = data;
 564
 565         /* zero length is not */
 566         if (len == 0)
 567                 return 0;
 568
 569         /* must terminate with zero */
 570         if (s[len - 1] != '\0')
 571                 return 0;
 572
 573         /* printable or a null byte (concatenated strings) */
 574         while (((*s == '\0') || isprint(*s)) && (len > 0)) {
 575                 /*
 576                  * If we see a null, there are three possibilities:
 577                  * 1) If len == 1, it is the end of the string, printable
 578                  * 2) Next character also a null, not printable.
 579                  * 3) Next character not a null, continue to check.
 580                  */
 581                 if (s[0] == '\0') {
 582                         if (len == 1)
 583                                 return 1;
 584                         if (s[1] == '\0')
 585                                 return 0;
 586                 }
 587                 s++;
 588                 len--;
 589         }
 590
 591         /* Not the null termination, or not done yet: not printable */
 592         if (*s != '\0' || (len != 0))
 593                 return 0;
 594
 595         return 1;
 596 }
 597
 598
 599 /*
 600  * Print the property in the best format, a heuristic guess.  Print as
 601  * a string, concatenated strings, a byte, word, double word, or (if all
 602  * else fails) it is printed as a stream of bytes.
 603  */
 604 static void print_data(const void *data, int len)
 605 {
 606         int j;
 607
 608         /* no data, don't print */
 609         if (len == 0)
 610                 return;
 611
 612         /*
 613          * It is a string, but it may have multiple strings (embedded '\0's).
 614          */
 615         if (is_printable_string(data, len)) {
 616                 puts("\"");
 617                 j = 0;
 618                 while (j < len) {
 619                         if (j > 0)
 620                                 puts("\", \"");
 621                         puts(data);
 622                         j    += strlen(data) + 1;
 623                         data += strlen(data) + 1;
 624                 }
 625                 puts("\"");
 626                 return;
 627         }
 628
 629         if ((len %4) == 0) {
 630                 const u32 *p;
 631
 632                 printf("<");
 633                 for (j = 0, p = data; j < len/4; j ++)
 634                         printf("0x%x%s", p[j], j < (len/4 - 1) ? " " : "");
 635                 printf(">");
 636         } else { /* anything else... hexdump */
 637                 const u8 *s;
 638
 639                 printf("[");
 640                 for (j = 0, s = data; j < len; j++)
 641                         printf("%02x%s", s[j], j < len - 1 ? " " : "");
 642                 printf("]");
 643         }
 644 }
 645
 646 /****************************************************************************/
 647
 648 /*
 649  * Recursively print (a portion of) the fdt.  The depth parameter
 650  * determines how deeply nested the fdt is printed.
 651  */
 652 static int fdt_print(const char *pathp, char *prop, int depth)
 653 {
 654         static char tabs[MAX_LEVEL+1] =
 655                 "\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t"
 656                 "\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t";
 657         const void *nodep;      /* property node pointer */
 658         int  nodeoffset;        /* node offset from libfdt */
 659         int  nextoffset;        /* next node offset from libfdt */
 660         uint32_t tag;           /* tag */
 661         int  len;               /* length of the property */
 662         int  level = 0;         /* keep track of nesting level */
 663         const struct fdt_property *fdt_prop;
 664
 665         nodeoffset = fdt_path_offset (fdt, pathp);
 666         if (nodeoffset < 0) {
 667                 /*
 668                  * Not found or something else bad happened.
 669                  */
 670                 printf ("libfdt fdt_path_offset() returned %s\n",
 671                         fdt_strerror(nodeoffset));
 672                 return 1;
 673         }
 674         /*
 675          * The user passed in a property as well as node path.
 676          * Print only the given property and then return.
 677          */
 678         if (prop) {
 679                 nodep = fdt_getprop (fdt, nodeoffset, prop, &len);
 680                 if (len == 0) {
 681                         /* no property value */
 682                         printf("%s %s\n", pathp, prop);
 683                         return 0;
 684                 } else if (len > 0) {
 685                         printf("%s = ", prop);
 686                         print_data (nodep, len);
 687                         printf("\n");
 688                         return 0;
 689                 } else {
 690                         printf ("libfdt fdt_getprop(): %s\n",
 691                                 fdt_strerror(len));
 692                         return 1;
 693                 }
 694         }
 695
 696         /*
 697          * The user passed in a node path and no property,
 698          * print the node and all subnodes.
 699          */
 700         while(level >= 0) {
 701                 tag = fdt_next_tag(fdt, nodeoffset, &nextoffset);
 702                 switch(tag) {
 703                 case FDT_BEGIN_NODE:
 704                         pathp = fdt_get_name(fdt, nodeoffset, NULL);
 705                         if (level <= depth) {
 706                                 if (pathp == NULL)
 707                                         pathp = "/* NULL pointer error */";
 708                                 if (*pathp == '\0')
 709                                         pathp = "/";    /* root is nameless */
 710                                 printf("%s%s {\n",
 711                                         &tabs[MAX_LEVEL - level], pathp);
 712                         }
 713                         level++;
 714                         if (level >= MAX_LEVEL) {
 715                                 printf("Nested too deep, aborting.\n");
 716                                 return 1;
 717                         }
 718                         break;
 719                 case FDT_END_NODE:
 720                         level--;
 721                         if (level <= depth)
 722                                 printf("%s};\n", &tabs[MAX_LEVEL - level]);
 723                         if (level == 0) {
 724                                 level = -1;             /* exit the loop */
 725                         }
 726                         break;
 727                 case FDT_PROP:
 728                         fdt_prop = fdt_offset_ptr(fdt, nodeoffset,
 729                                         sizeof(*fdt_prop));
 730                         pathp    = fdt_string(fdt,
 731                                         fdt32_to_cpu(fdt_prop->nameoff));
 732                         len      = fdt32_to_cpu(fdt_prop->len);
 733                         nodep    = fdt_prop->data;
 734                         if (len < 0) {
 735                                 printf ("libfdt fdt_getprop(): %s\n",
 736                                         fdt_strerror(len));
 737                                 return 1;
 738                         } else if (len == 0) {
 739                                 /* the property has no value */
 740                                 if (level <= depth)
 741                                         printf("%s%s;\n",
 742                                                 &tabs[MAX_LEVEL - level],
 743                                                 pathp);
 744                         } else {
 745                                 if (level <= depth) {
 746                                         printf("%s%s = ",
 747                                                 &tabs[MAX_LEVEL - level],
 748                                                 pathp);
 749                                         print_data (nodep, len);
 750                                         printf(";\n");
 751                                 }
 752                         }
 753                         break;
 754                 case FDT_NOP:
 755                         printf("/* NOP */\n", &tabs[MAX_LEVEL - level]);
 756                         break;
 757                 case FDT_END:
 758                         return 1;
 759                 default:
 760                         if (level <= depth)
 761                                 printf("Unknown tag 0x%08X\n", tag);
 762                         return 1;
 763                 }
 764                 nodeoffset = nextoffset;
 765         }
 766         return 0;
 767 }
 768
 769 /********************************************************************/
 770
 771 U_BOOT_CMD(
 772         fdt,    255,    0,      do_fdt,
 773         "fdt     - flattened device tree utility commands\n",
 774             "addr   <addr> [<length>]        - Set the fdt location to <addr>\n"
 775 #ifdef CONFIG_OF_BOARD_SETUP
 776         "fdt boardsetup                      - Do board-specific set up\n"
 777 #endif
 778         "fdt move   <fdt> <newaddr> <length> - Copy the fdt to <addr> and make it active\n"
 779         "fdt print  <path> [<prop>]          - Recursive print starting at <path>\n"
 780         "fdt list   <path> [<prop>]          - Print one level starting at <path>\n"
 781         "fdt set    <path> <prop> [<val>]    - Set <property> [to <val>]\n"
 782         "fdt mknode <path> <node>            - Create a new node after <path>\n"
 783         "fdt rm     <path> [<prop>]          - Delete the node or <property>\n"
 784         "fdt header                          - Display header info\n"
 785         "fdt bootcpu <id>                    - Set boot cpuid\n"
 786         "fdt memory <addr> <size>            - Add/Update memory node\n"
 787         "fdt rsvmem print                    - Show current mem reserves\n"
 788         "fdt rsvmem add <addr> <size>        - Add a mem reserve\n"
 789         "fdt rsvmem delete <index>           - Delete a mem reserves\n"
 790         "fdt chosen - Add/update the /chosen branch in the tree\n"
 791         "NOTE: If the path or property you are setting/printing has a '#' character\n"
 792         "     or spaces, you MUST escape it with a \\ character or quote it with \".\n"
 793 );