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