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