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  * The working_fdt points to our working flattened device tree.
  50  */
  51 struct fdt_header *working_fdt;
  52
  53 /*
  54  * Flattened Device Tree command, see the help for parameter definitions.
  55  */
  56 int do_fdt (cmd_tbl_t * cmdtp, int flag, int argc, char *argv[])
  57 {
  58         if (argc < 2) {
  59                 printf ("Usage:\n%s\n", cmdtp->usage);
  60                 return 1;
  61         }
  62
  63         /********************************************************************
  64          * Set the address of the fdt
  65          ********************************************************************/
  66         if (argv[1][0] == 'a') {
  67                 /*
  68                  * Set the address [and length] of the fdt.
  69                  */
  70                 if (argc == 2) {
  71                         if (!fdt_valid()) {
  72                                 return 1;
  73                         }
  74                         printf("The address of the fdt is %p\n", working_fdt);
  75                         return 0;
  76                 }
  77
  78                 working_fdt = (struct fdt_header *)simple_strtoul(argv[2], NULL, 16);
  79
  80                 if (!fdt_valid()) {
  81                         return 1;
  82                 }
  83
  84                 if (argc >= 4) {
  85                         int  len;
  86                         int  err;
  87                         /*
  88                          * Optional new length
  89                          */
  90                         len = simple_strtoul(argv[3], NULL, 16);
  91                         if (len < fdt_totalsize(working_fdt)) {
  92                                 printf ("New length %d < existing length %d, "
  93                                         "ignoring.\n",
  94                                         len, fdt_totalsize(working_fdt));
  95                         } else {
  96                                 /*
  97                                  * Open in place with a new length.
  98                                  */
  99                                 err = fdt_open_into(working_fdt, working_fdt, len);
 100                                 if (err != 0) {
 101                                         printf ("libfdt fdt_open_into(): %s\n",
 102                                                 fdt_strerror(err));
 103                                 }
 104                         }
 105                 }
 106
 107         /********************************************************************
 108          * Move the working_fdt
 109          ********************************************************************/
 110         } else if (strncmp(argv[1], "mo", 2) == 0) {
 111                 struct fdt_header *newaddr;
 112                 int  len;
 113                 int  err;
 114
 115                 if (argc < 4) {
 116                         printf ("Usage:\n%s\n", cmdtp->usage);
 117                         return 1;
 118                 }
 119
 120                 /*
 121                  * Set the address and length of the fdt.
 122                  */
 123                 working_fdt = (struct fdt_header *)simple_strtoul(argv[2], NULL, 16);
 124                 if (!fdt_valid()) {
 125                         return 1;
 126                 }
 127
 128                 newaddr = (struct fdt_header *)simple_strtoul(argv[3],NULL,16);
 129
 130                 /*
 131                  * If the user specifies a length, use that.  Otherwise use the
 132                  * current length.
 133                  */
 134                 if (argc <= 4) {
 135                         len = fdt_totalsize(working_fdt);
 136                 } else {
 137                         len = simple_strtoul(argv[4], NULL, 16);
 138                         if (len < fdt_totalsize(working_fdt)) {
 139                                 printf ("New length 0x%X < existing length "
 140                                         "0x%X, aborting.\n",
 141                                         len, fdt_totalsize(working_fdt));
 142                                 return 1;
 143                         }
 144                 }
 145
 146                 /*
 147                  * Copy to the new location.
 148                  */
 149                 err = fdt_open_into(working_fdt, newaddr, len);
 150                 if (err != 0) {
 151                         printf ("libfdt fdt_open_into(): %s\n",
 152                                 fdt_strerror(err));
 153                         return 1;
 154                 }
 155                 working_fdt = newaddr;
 156
 157         /********************************************************************
 158          * Make a new node
 159          ********************************************************************/
 160         } else if (strncmp(argv[1], "mk", 2) == 0) {
 161                 char *pathp;            /* path */
 162                 char *nodep;            /* new node to add */
 163                 int  nodeoffset;        /* node offset from libfdt */
 164                 int  err;
 165
 166                 /*
 167                  * Parameters: Node path, new node to be appended to the path.
 168                  */
 169                 if (argc < 4) {
 170                         printf ("Usage:\n%s\n", cmdtp->usage);
 171                         return 1;
 172                 }
 173
 174                 pathp = argv[2];
 175                 nodep = argv[3];
 176
 177                 nodeoffset = fdt_path_offset (working_fdt, pathp);
 178                 if (nodeoffset < 0) {
 179                         /*
 180                          * Not found or something else bad happened.
 181                          */
 182                         printf ("libfdt fdt_path_offset() returned %s\n",
 183                                 fdt_strerror(nodeoffset));
 184                         return 1;
 185                 }
 186                 err = fdt_add_subnode(working_fdt, nodeoffset, nodep);
 187                 if (err < 0) {
 188                         printf ("libfdt fdt_add_subnode(): %s\n",
 189                                 fdt_strerror(err));
 190                         return 1;
 191                 }
 192
 193         /********************************************************************
 194          * Set the value of a property in the working_fdt.
 195          ********************************************************************/
 196         } else if (argv[1][0] == 's') {
 197                 char *pathp;            /* path */
 198                 char *prop;             /* property */
 199                 int  nodeoffset;        /* node offset from libfdt */
 200                 static char data[SCRATCHPAD];   /* storage for the property */
 201                 int  len;               /* new length of the property */
 202                 int  ret;               /* return value */
 203
 204                 /*
 205                  * Parameters: Node path, property, optional value.
 206                  */
 207                 if (argc < 4) {
 208                         printf ("Usage:\n%s\n", cmdtp->usage);
 209                         return 1;
 210                 }
 211
 212                 pathp  = argv[2];
 213                 prop   = argv[3];
 214                 if (argc == 4) {
 215                         len = 0;
 216                 } else {
 217                         ret = fdt_parse_prop(&argv[4], argc - 4, data, &len);
 218                         if (ret != 0)
 219                                 return ret;
 220                 }
 221
 222                 nodeoffset = fdt_path_offset (working_fdt, pathp);
 223                 if (nodeoffset < 0) {
 224                         /*
 225                          * Not found or something else bad happened.
 226                          */
 227                         printf ("libfdt fdt_path_offset() returned %s\n",
 228                                 fdt_strerror(nodeoffset));
 229                         return 1;
 230                 }
 231
 232                 ret = fdt_setprop(working_fdt, nodeoffset, prop, data, len);
 233                 if (ret < 0) {
 234                         printf ("libfdt fdt_setprop(): %s\n", fdt_strerror(ret));
 235                         return 1;
 236                 }
 237
 238         /********************************************************************
 239          * Print (recursive) / List (single level)
 240          ********************************************************************/
 241         } else if ((argv[1][0] == 'p') || (argv[1][0] == 'l')) {
 242                 int depth = MAX_LEVEL;  /* how deep to print */
 243                 char *pathp;            /* path */
 244                 char *prop;             /* property */
 245                 int  ret;               /* return value */
 246                 static char root[2] = "/";
 247
 248                 /*
 249                  * list is an alias for print, but limited to 1 level
 250                  */
 251                 if (argv[1][0] == 'l') {
 252                         depth = 1;
 253                 }
 254
 255                 /*
 256                  * Get the starting path.  The root node is an oddball,
 257                  * the offset is zero and has no name.
 258                  */
 259                 if (argc == 2)
 260                         pathp = root;
 261                 else
 262                         pathp = argv[2];
 263                 if (argc > 3)
 264                         prop = argv[3];
 265                 else
 266                         prop = NULL;
 267
 268                 ret = fdt_print(pathp, prop, depth);
 269                 if (ret != 0)
 270                         return ret;
 271
 272         /********************************************************************
 273          * Remove a property/node
 274          ********************************************************************/
 275         } else if (strncmp(argv[1], "rm", 2) == 0) {
 276                 int  nodeoffset;        /* node offset from libfdt */
 277                 int  err;
 278
 279                 /*
 280                  * Get the path.  The root node is an oddball, the offset
 281                  * is zero and has no name.
 282                  */
 283                 nodeoffset = fdt_path_offset (working_fdt, argv[2]);
 284                 if (nodeoffset < 0) {
 285                         /*
 286                          * Not found or something else bad happened.
 287                          */
 288                         printf ("libfdt fdt_path_offset() returned %s\n",
 289                                 fdt_strerror(nodeoffset));
 290                         return 1;
 291                 }
 292                 /*
 293                  * Do the delete.  A fourth parameter means delete a property,
 294                  * otherwise delete the node.
 295                  */
 296                 if (argc > 3) {
 297                         err = fdt_delprop(working_fdt, nodeoffset, argv[3]);
 298                         if (err < 0) {
 299                                 printf("libfdt fdt_delprop():  %s\n",
 300                                         fdt_strerror(err));
 301                                 return err;
 302                         }
 303                 } else {
 304                         err = fdt_del_node(working_fdt, nodeoffset);
 305                         if (err < 0) {
 306                                 printf("libfdt fdt_del_node():  %s\n",
 307                                         fdt_strerror(err));
 308                                 return err;
 309                         }
 310                 }
 311
 312         /********************************************************************
 313          * Display header info
 314          ********************************************************************/
 315         } else if (argv[1][0] == 'h') {
 316                 u32 version = fdt_version(working_fdt);
 317                 printf("magic:\t\t\t0x%x\n", fdt_magic(working_fdt));
 318                 printf("totalsize:\t\t0x%x (%d)\n", fdt_totalsize(working_fdt),
 319                        fdt_totalsize(working_fdt));
 320                 printf("off_dt_struct:\t\t0x%x\n",
 321                        fdt_off_dt_struct(working_fdt));
 322                 printf("off_dt_strings:\t\t0x%x\n",
 323                        fdt_off_dt_strings(working_fdt));
 324                 printf("off_mem_rsvmap:\t\t0x%x\n",
 325                        fdt_off_mem_rsvmap(working_fdt));
 326                 printf("version:\t\t%d\n", version);
 327                 printf("last_comp_version:\t%d\n",
 328                        fdt_last_comp_version(working_fdt));
 329                 if (version >= 2)
 330                         printf("boot_cpuid_phys:\t0x%x\n",
 331                                 fdt_boot_cpuid_phys(working_fdt));
 332                 if (version >= 3)
 333                         printf("size_dt_strings:\t0x%x\n",
 334                                 fdt_size_dt_strings(working_fdt));
 335                 if (version >= 17)
 336                         printf("size_dt_struct:\t\t0x%x\n",
 337                                 fdt_size_dt_struct(working_fdt));
 338                 printf("number mem_rsv:\t\t0x%x\n",
 339                        fdt_num_mem_rsv(working_fdt));
 340                 printf("\n");
 341
 342         /********************************************************************
 343          * Set boot cpu id
 344          ********************************************************************/
 345         } else if (strncmp(argv[1], "boo", 3) == 0) {
 346                 unsigned long tmp = simple_strtoul(argv[2], NULL, 16);
 347                 fdt_set_boot_cpuid_phys(working_fdt, tmp);
 348
 349         /********************************************************************
 350          * memory command
 351          ********************************************************************/
 352         } else if (strncmp(argv[1], "me", 2) == 0) {
 353                 uint64_t addr, size;
 354                 int err;
 355 #ifdef CFG_64BIT_STRTOUL
 356                         addr = simple_strtoull(argv[2], NULL, 16);
 357                         size = simple_strtoull(argv[3], NULL, 16);
 358 #else
 359                         addr = simple_strtoul(argv[2], NULL, 16);
 360                         size = simple_strtoul(argv[3], NULL, 16);
 361 #endif
 362                 err = fdt_fixup_memory(working_fdt, addr, size);
 363                 if (err < 0)
 364                         return err;
 365
 366         /********************************************************************
 367          * mem reserve commands
 368          ********************************************************************/
 369         } else if (strncmp(argv[1], "rs", 2) == 0) {
 370                 if (argv[2][0] == 'p') {
 371                         uint64_t addr, size;
 372                         int total = fdt_num_mem_rsv(working_fdt);
 373                         int j, err;
 374                         printf("index\t\t   start\t\t    size\n");
 375                         printf("-------------------------------"
 376                                 "-----------------\n");
 377                         for (j = 0; j < total; j++) {
 378                                 err = fdt_get_mem_rsv(working_fdt, j, &addr, &size);
 379                                 if (err < 0) {
 380                                         printf("libfdt fdt_get_mem_rsv():  %s\n",
 381                                                         fdt_strerror(err));
 382                                         return err;
 383                                 }
 384                                 printf("    %x\t%08x%08x\t%08x%08x\n", j,
 385                                         (u32)(addr >> 32),
 386                                         (u32)(addr & 0xffffffff),
 387                                         (u32)(size >> 32),
 388                                         (u32)(size & 0xffffffff));
 389                         }
 390                 } else if (argv[2][0] == 'a') {
 391                         uint64_t addr, size;
 392                         int err;
 393 #ifdef CFG_64BIT_STRTOUL
 394                         addr = simple_strtoull(argv[3], NULL, 16);
 395                         size = simple_strtoull(argv[4], NULL, 16);
 396 #else
 397                         addr = simple_strtoul(argv[3], NULL, 16);
 398                         size = simple_strtoul(argv[4], NULL, 16);
 399 #endif
 400                         err = fdt_add_mem_rsv(working_fdt, addr, size);
 401
 402                         if (err < 0) {
 403                                 printf("libfdt fdt_add_mem_rsv():  %s\n",
 404                                         fdt_strerror(err));
 405                                 return err;
 406                         }
 407                 } else if (argv[2][0] == 'd') {
 408                         unsigned long idx = simple_strtoul(argv[3], NULL, 16);
 409                         int err = fdt_del_mem_rsv(working_fdt, idx);
 410
 411                         if (err < 0) {
 412                                 printf("libfdt fdt_del_mem_rsv():  %s\n",
 413                                         fdt_strerror(err));
 414                                 return err;
 415                         }
 416                 } else {
 417                         /* Unrecognized command */
 418                         printf ("Usage:\n%s\n", cmdtp->usage);
 419                         return 1;
 420                 }
 421         }
 422 #ifdef CONFIG_OF_BOARD_SETUP
 423         /* Call the board-specific fixup routine */
 424         else if (strncmp(argv[1], "boa", 3) == 0)
 425                 ft_board_setup(working_fdt, gd->bd);
 426 #endif
 427         /* Create a chosen node */
 428         else if (argv[1][0] == 'c') {
 429                 unsigned long initrd_start = 0, initrd_end = 0;
 430
 431                 if ((argc != 2) && (argc != 4)) {
 432                         printf ("Usage:\n%s\n", cmdtp->usage);
 433                         return 1;
 434                 }
 435
 436                 if (argc == 4) {
 437                         initrd_start = simple_strtoul(argv[2], NULL, 16);
 438                         initrd_end = simple_strtoul(argv[3], NULL, 16);
 439                 }
 440
 441                 fdt_chosen(working_fdt, initrd_start, initrd_end, 1);
 442         } else {
 443                 /* Unrecognized command */
 444                 printf ("Usage:\n%s\n", cmdtp->usage);
 445                 return 1;
 446         }
 447
 448         return 0;
 449 }
 450
 451 /****************************************************************************/
 452
 453 static int fdt_valid(void)
 454 {
 455         int  err;
 456
 457         if (working_fdt == NULL) {
 458                 printf ("The address of the fdt is invalid (NULL).\n");
 459                 return 0;
 460         }
 461
 462         err = fdt_check_header(working_fdt);
 463         if (err == 0)
 464                 return 1;       /* valid */
 465
 466         if (err < 0) {
 467                 printf("libfdt fdt_check_header(): %s", fdt_strerror(err));
 468                 /*
 469                  * Be more informative on bad version.
 470                  */
 471                 if (err == -FDT_ERR_BADVERSION) {
 472                         if (fdt_version(working_fdt) <
 473                             FDT_FIRST_SUPPORTED_VERSION) {
 474                                 printf (" - too old, fdt %d < %d",
 475                                         fdt_version(working_fdt),
 476                                         FDT_FIRST_SUPPORTED_VERSION);
 477                                 working_fdt = NULL;
 478                         }
 479                         if (fdt_last_comp_version(working_fdt) >
 480                             FDT_LAST_SUPPORTED_VERSION) {
 481                                 printf (" - too new, fdt %d > %d",
 482                                         fdt_version(working_fdt),
 483                                         FDT_LAST_SUPPORTED_VERSION);
 484                                 working_fdt = NULL;
 485                         }
 486                         return 0;
 487                 }
 488                 printf("\n");
 489                 return 0;
 490         }
 491         return 1;
 492 }
 493
 494 /****************************************************************************/
 495
 496 /*
 497  * Parse the user's input, partially heuristic.  Valid formats:
 498  * <0x00112233 4 05>    - an array of cells.  Numbers follow standard
 499  *                      C conventions.
 500  * [00 11 22 .. nn] - byte stream
 501  * "string"     - If the the value doesn't start with "<" or "[", it is
 502  *                      treated as a string.  Note that the quotes are
 503  *                      stripped by the parser before we get the string.
 504  * newval: An array of strings containing the new property as specified
 505  *      on the command line
 506  * count: The number of strings in the array
 507  * data: A bytestream to be placed in the property
 508  * len: The length of the resulting bytestream
 509  */
 510 static int fdt_parse_prop(char **newval, int count, char *data, int *len)
 511 {
 512         char *cp;               /* temporary char pointer */
 513         char *newp;             /* temporary newval char pointer */
 514         unsigned long tmp;      /* holds converted values */
 515         int stridx = 0;
 516
 517         *len = 0;
 518         newp = newval[0];
 519
 520         /* An array of cells */
 521         if (*newp == '<') {
 522                 newp++;
 523                 while ((*newp != '>') && (stridx < count)) {
 524                         /*
 525                          * Keep searching until we find that last ">"
 526                          * That way users don't have to escape the spaces
 527                          */
 528                         if (*newp == '\0') {
 529                                 newp = newval[++stridx];
 530                                 continue;
 531                         }
 532
 533                         cp = newp;
 534                         tmp = simple_strtoul(cp, &newp, 0);
 535                         *(uint32_t *)data = __cpu_to_be32(tmp);
 536                         data  += 4;
 537                         *len += 4;
 538
 539                         /* If the ptr didn't advance, something went wrong */
 540                         if ((newp - cp) <= 0) {
 541                                 printf("Sorry, I could not convert \"%s\"\n",
 542                                         cp);
 543                                 return 1;
 544                         }
 545
 546                         while (*newp == ' ')
 547                                 newp++;
 548                 }
 549
 550                 if (*newp != '>') {
 551                         printf("Unexpected character '%c'\n", *newp);
 552                         return 1;
 553                 }
 554         } else if (*newp == '[') {
 555                 /*
 556                  * Byte stream.  Convert the values.
 557                  */
 558                 newp++;
 559                 while ((*newp != ']') && (stridx < count)) {
 560                         tmp = simple_strtoul(newp, &newp, 16);
 561                         *data++ = tmp & 0xFF;
 562                         *len    = *len + 1;
 563                         while (*newp == ' ')
 564                                 newp++;
 565                         if (*newp != '\0')
 566                                 newp = newval[++stridx];
 567                 }
 568                 if (*newp != ']') {
 569                         printf("Unexpected character '%c'\n", *newp);
 570                         return 1;
 571                 }
 572         } else {
 573                 /*
 574                  * Assume it is a string.  Copy it into our data area for
 575                  * convenience (including the terminating '\0').
 576                  */
 577                 while (stridx < count) {
 578                         *len = strlen(newp) + 1;
 579                         strcpy(data, newp);
 580                         newp = newval[++stridx];
 581                 }
 582         }
 583         return 0;
 584 }
 585
 586 /****************************************************************************/
 587
 588 /*
 589  * Heuristic to guess if this is a string or concatenated strings.
 590  */
 591
 592 static int is_printable_string(const void *data, int len)
 593 {
 594         const char *s = data;
 595
 596         /* zero length is not */
 597         if (len == 0)
 598                 return 0;
 599
 600         /* must terminate with zero */
 601         if (s[len - 1] != '\0')
 602                 return 0;
 603
 604         /* printable or a null byte (concatenated strings) */
 605         while (((*s == '\0') || isprint(*s)) && (len > 0)) {
 606                 /*
 607                  * If we see a null, there are three possibilities:
 608                  * 1) If len == 1, it is the end of the string, printable
 609                  * 2) Next character also a null, not printable.
 610                  * 3) Next character not a null, continue to check.
 611                  */
 612                 if (s[0] == '\0') {
 613                         if (len == 1)
 614                                 return 1;
 615                         if (s[1] == '\0')
 616                                 return 0;
 617                 }
 618                 s++;
 619                 len--;
 620         }
 621
 622         /* Not the null termination, or not done yet: not printable */
 623         if (*s != '\0' || (len != 0))
 624                 return 0;
 625
 626         return 1;
 627 }
 628
 629
 630 /*
 631  * Print the property in the best format, a heuristic guess.  Print as
 632  * a string, concatenated strings, a byte, word, double word, or (if all
 633  * else fails) it is printed as a stream of bytes.
 634  */
 635 static void print_data(const void *data, int len)
 636 {
 637         int j;
 638
 639         /* no data, don't print */
 640         if (len == 0)
 641                 return;
 642
 643         /*
 644          * It is a string, but it may have multiple strings (embedded '\0's).
 645          */
 646         if (is_printable_string(data, len)) {
 647                 puts("\"");
 648                 j = 0;
 649                 while (j < len) {
 650                         if (j > 0)
 651                                 puts("\", \"");
 652                         puts(data);
 653                         j    += strlen(data) + 1;
 654                         data += strlen(data) + 1;
 655                 }
 656                 puts("\"");
 657                 return;
 658         }
 659
 660         if ((len %4) == 0) {
 661                 const u32 *p;
 662
 663                 printf("<");
 664                 for (j = 0, p = data; j < len/4; j ++)
 665                         printf("0x%x%s", p[j], j < (len/4 - 1) ? " " : "");
 666                 printf(">");
 667         } else { /* anything else... hexdump */
 668                 const u8 *s;
 669
 670                 printf("[");
 671                 for (j = 0, s = data; j < len; j++)
 672                         printf("%02x%s", s[j], j < len - 1 ? " " : "");
 673                 printf("]");
 674         }
 675 }
 676
 677 /****************************************************************************/
 678
 679 /*
 680  * Recursively print (a portion of) the working_fdt.  The depth parameter
 681  * determines how deeply nested the fdt is printed.
 682  */
 683 static int fdt_print(const char *pathp, char *prop, int depth)
 684 {
 685         static char tabs[MAX_LEVEL+1] =
 686                 "\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t"
 687                 "\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t";
 688         const void *nodep;      /* property node pointer */
 689         int  nodeoffset;        /* node offset from libfdt */
 690         int  nextoffset;        /* next node offset from libfdt */
 691         uint32_t tag;           /* tag */
 692         int  len;               /* length of the property */
 693         int  level = 0;         /* keep track of nesting level */
 694         const struct fdt_property *fdt_prop;
 695
 696         nodeoffset = fdt_path_offset (working_fdt, pathp);
 697         if (nodeoffset < 0) {
 698                 /*
 699                  * Not found or something else bad happened.
 700                  */
 701                 printf ("libfdt fdt_path_offset() returned %s\n",
 702                         fdt_strerror(nodeoffset));
 703                 return 1;
 704         }
 705         /*
 706          * The user passed in a property as well as node path.
 707          * Print only the given property and then return.
 708          */
 709         if (prop) {
 710                 nodep = fdt_getprop (working_fdt, nodeoffset, prop, &len);
 711                 if (len == 0) {
 712                         /* no property value */
 713                         printf("%s %s\n", pathp, prop);
 714                         return 0;
 715                 } else if (len > 0) {
 716                         printf("%s = ", prop);
 717                         print_data (nodep, len);
 718                         printf("\n");
 719                         return 0;
 720                 } else {
 721                         printf ("libfdt fdt_getprop(): %s\n",
 722                                 fdt_strerror(len));
 723                         return 1;
 724                 }
 725         }
 726
 727         /*
 728          * The user passed in a node path and no property,
 729          * print the node and all subnodes.
 730          */
 731         while(level >= 0) {
 732                 tag = fdt_next_tag(working_fdt, nodeoffset, &nextoffset);
 733                 switch(tag) {
 734                 case FDT_BEGIN_NODE:
 735                         pathp = fdt_get_name(working_fdt, nodeoffset, NULL);
 736                         if (level <= depth) {
 737                                 if (pathp == NULL)
 738                                         pathp = "/* NULL pointer error */";
 739                                 if (*pathp == '\0')
 740                                         pathp = "/";    /* root is nameless */
 741                                 printf("%s%s {\n",
 742                                         &tabs[MAX_LEVEL - level], pathp);
 743                         }
 744                         level++;
 745                         if (level >= MAX_LEVEL) {
 746                                 printf("Nested too deep, aborting.\n");
 747                                 return 1;
 748                         }
 749                         break;
 750                 case FDT_END_NODE:
 751                         level--;
 752                         if (level <= depth)
 753                                 printf("%s};\n", &tabs[MAX_LEVEL - level]);
 754                         if (level == 0) {
 755                                 level = -1;             /* exit the loop */
 756                         }
 757                         break;
 758                 case FDT_PROP:
 759                         fdt_prop = fdt_offset_ptr(working_fdt, nodeoffset,
 760                                         sizeof(*fdt_prop));
 761                         pathp    = fdt_string(working_fdt,
 762                                         fdt32_to_cpu(fdt_prop->nameoff));
 763                         len      = fdt32_to_cpu(fdt_prop->len);
 764                         nodep    = fdt_prop->data;
 765                         if (len < 0) {
 766                                 printf ("libfdt fdt_getprop(): %s\n",
 767                                         fdt_strerror(len));
 768                                 return 1;
 769                         } else if (len == 0) {
 770                                 /* the property has no value */
 771                                 if (level <= depth)
 772                                         printf("%s%s;\n",
 773                                                 &tabs[MAX_LEVEL - level],
 774                                                 pathp);
 775                         } else {
 776                                 if (level <= depth) {
 777                                         printf("%s%s = ",
 778                                                 &tabs[MAX_LEVEL - level],
 779                                                 pathp);
 780                                         print_data (nodep, len);
 781                                         printf(";\n");
 782                                 }
 783                         }
 784                         break;
 785                 case FDT_NOP:
 786                         printf("%s/* NOP */\n", &tabs[MAX_LEVEL - level]);
 787                         break;
 788                 case FDT_END:
 789                         return 1;
 790                 default:
 791                         if (level <= depth)
 792                                 printf("Unknown tag 0x%08X\n", tag);
 793                         return 1;
 794                 }
 795                 nodeoffset = nextoffset;
 796         }
 797         return 0;
 798 }
 799
 800 /********************************************************************/
 801
 802 U_BOOT_CMD(
 803         fdt,    255,    0,      do_fdt,
 804         "fdt     - flattened device tree utility commands\n",
 805             "addr   <addr> [<length>]        - Set the fdt location to <addr>\n"
 806 #ifdef CONFIG_OF_BOARD_SETUP
 807         "fdt boardsetup                      - Do board-specific set up\n"
 808 #endif
 809         "fdt move   <fdt> <newaddr> <length> - Copy the fdt to <addr> and make it active\n"
 810         "fdt print  <path> [<prop>]          - Recursive print starting at <path>\n"
 811         "fdt list   <path> [<prop>]          - Print one level starting at <path>\n"
 812         "fdt set    <path> <prop> [<val>]    - Set <property> [to <val>]\n"
 813         "fdt mknode <path> <node>            - Create a new node after <path>\n"
 814         "fdt rm     <path> [<prop>]          - Delete the node or <property>\n"
 815         "fdt header                          - Display header info\n"
 816         "fdt bootcpu <id>                    - Set boot cpuid\n"
 817         "fdt memory <addr> <size>            - Add/Update memory node\n"
 818         "fdt rsvmem print                    - Show current mem reserves\n"
 819         "fdt rsvmem add <addr> <size>        - Add a mem reserve\n"
 820         "fdt rsvmem delete <index>           - Delete a mem reserves\n"
 821         "fdt chosen [<start> <end>]          - Add/update the /chosen branch in the tree\n"
 822         "                                        <start>/<end> - initrd start/end addr\n"
 823         "NOTE: Dereference aliases by omiting the leading '/', "
 824                 "e.g. fdt print ethernet0.\n"
 825 );