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