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         char buf[17];
  59
  60         working_fdt = addr;
  61
  62         sprintf(buf, "%lx", (unsigned long)addr);
  63         setenv("fdtaddr", buf);
  64 }
  65
  66 /*
  67  * Get a value from the fdt and format it to be set in the environment
  68  */
  69 static int fdt_value_setenv(const void *nodep, int len, const char *var)
  70 {
  71         if (is_printable_string(nodep, len))
  72                 setenv(var, (void *)nodep);
  73         else if (len == 4) {
  74                 char buf[11];
  75
  76                 sprintf(buf, "0x%08X", *(uint32_t *)nodep);
  77                 setenv(var, buf);
  78         } else if (len%4 == 0 && len <= 20) {
  79                 /* Needed to print things like sha1 hashes. */
  80                 char buf[41];
  81                 int i;
  82
  83                 for (i = 0; i < len; i += sizeof(unsigned int))
  84                         sprintf(buf + (i * 2), "%08x",
  85                                 *(unsigned int *)(nodep + i));
  86                 setenv(var, buf);
  87         } else {
  88                 printf("error: unprintable value\n");
  89                 return 1;
  90         }
  91         return 0;
  92 }
  93
  94 /*
  95  * Flattened Device Tree command, see the help for parameter definitions.
  96  */
  97 static int do_fdt(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
  98 {
  99         if (argc < 2)
 100                 return CMD_RET_USAGE;
 101
 102         /*
 103          * Set the address of the fdt
 104          */
 105         if (argv[1][0] == 'a') {
 106                 unsigned long addr;
 107                 /*
 108                  * Set the address [and length] of the fdt.
 109                  */
 110                 if (argc == 2) {
 111                         if (!fdt_valid()) {
 112                                 return 1;
 113                         }
 114                         printf("The address of the fdt is %p\n", working_fdt);
 115                         return 0;
 116                 }
 117
 118                 addr = simple_strtoul(argv[2], NULL, 16);
 119                 set_working_fdt_addr((void *)addr);
 120
 121                 if (!fdt_valid()) {
 122                         return 1;
 123                 }
 124
 125                 if (argc >= 4) {
 126                         int  len;
 127                         int  err;
 128                         /*
 129                          * Optional new length
 130                          */
 131                         len = simple_strtoul(argv[3], NULL, 16);
 132                         if (len < fdt_totalsize(working_fdt)) {
 133                                 printf ("New length %d < existing length %d, "
 134                                         "ignoring.\n",
 135                                         len, fdt_totalsize(working_fdt));
 136                         } else {
 137                                 /*
 138                                  * Open in place with a new length.
 139                                  */
 140                                 err = fdt_open_into(working_fdt, working_fdt, len);
 141                                 if (err != 0) {
 142                                         printf ("libfdt fdt_open_into(): %s\n",
 143                                                 fdt_strerror(err));
 144                                 }
 145                         }
 146                 }
 147
 148                 return CMD_RET_SUCCESS;
 149         }
 150
 151         if (!working_fdt) {
 152                 puts(
 153                         "No FDT memory address configured. Please configure\n"
 154                         "the FDT address via \"fdt addr <address>\" command.\n"
 155                         "Aborting!\n");
 156                 return CMD_RET_FAILURE;
 157         }
 158
 159         /*
 160          * Move the working_fdt
 161          */
 162         if (strncmp(argv[1], "mo", 2) == 0) {
 163                 struct fdt_header *newaddr;
 164                 int  len;
 165                 int  err;
 166
 167                 if (argc < 4)
 168                         return CMD_RET_USAGE;
 169
 170                 /*
 171                  * Set the address and length of the fdt.
 172                  */
 173                 working_fdt = (struct fdt_header *)simple_strtoul(argv[2], NULL, 16);
 174                 if (!fdt_valid()) {
 175                         return 1;
 176                 }
 177
 178                 newaddr = (struct fdt_header *)simple_strtoul(argv[3],NULL,16);
 179
 180                 /*
 181                  * If the user specifies a length, use that.  Otherwise use the
 182                  * current length.
 183                  */
 184                 if (argc <= 4) {
 185                         len = fdt_totalsize(working_fdt);
 186                 } else {
 187                         len = simple_strtoul(argv[4], NULL, 16);
 188                         if (len < fdt_totalsize(working_fdt)) {
 189                                 printf ("New length 0x%X < existing length "
 190                                         "0x%X, aborting.\n",
 191                                         len, fdt_totalsize(working_fdt));
 192                                 return 1;
 193                         }
 194                 }
 195
 196                 /*
 197                  * Copy to the new location.
 198                  */
 199                 err = fdt_open_into(working_fdt, newaddr, len);
 200                 if (err != 0) {
 201                         printf ("libfdt fdt_open_into(): %s\n",
 202                                 fdt_strerror(err));
 203                         return 1;
 204                 }
 205                 working_fdt = newaddr;
 206
 207         /*
 208          * Make a new node
 209          */
 210         } else if (strncmp(argv[1], "mk", 2) == 0) {
 211                 char *pathp;            /* path */
 212                 char *nodep;            /* new node to add */
 213                 int  nodeoffset;        /* node offset from libfdt */
 214                 int  err;
 215
 216                 /*
 217                  * Parameters: Node path, new node to be appended to the path.
 218                  */
 219                 if (argc < 4)
 220                         return CMD_RET_USAGE;
 221
 222                 pathp = argv[2];
 223                 nodep = argv[3];
 224
 225                 nodeoffset = fdt_path_offset (working_fdt, pathp);
 226                 if (nodeoffset < 0) {
 227                         /*
 228                          * Not found or something else bad happened.
 229                          */
 230                         printf ("libfdt fdt_path_offset() returned %s\n",
 231                                 fdt_strerror(nodeoffset));
 232                         return 1;
 233                 }
 234                 err = fdt_add_subnode(working_fdt, nodeoffset, nodep);
 235                 if (err < 0) {
 236                         printf ("libfdt fdt_add_subnode(): %s\n",
 237                                 fdt_strerror(err));
 238                         return 1;
 239                 }
 240
 241         /*
 242          * Set the value of a property in the working_fdt.
 243          */
 244         } else if (argv[1][0] == 's') {
 245                 char *pathp;            /* path */
 246                 char *prop;             /* property */
 247                 int  nodeoffset;        /* node offset from libfdt */
 248                 static char data[SCRATCHPAD];   /* storage for the property */
 249                 int  len;               /* new length of the property */
 250                 int  ret;               /* return value */
 251
 252                 /*
 253                  * Parameters: Node path, property, optional value.
 254                  */
 255                 if (argc < 4)
 256                         return CMD_RET_USAGE;
 257
 258                 pathp  = argv[2];
 259                 prop   = argv[3];
 260                 if (argc == 4) {
 261                         len = 0;
 262                 } else {
 263                         ret = fdt_parse_prop(&argv[4], argc - 4, data, &len);
 264                         if (ret != 0)
 265                                 return ret;
 266                 }
 267
 268                 nodeoffset = fdt_path_offset (working_fdt, pathp);
 269                 if (nodeoffset < 0) {
 270                         /*
 271                          * Not found or something else bad happened.
 272                          */
 273                         printf ("libfdt fdt_path_offset() returned %s\n",
 274                                 fdt_strerror(nodeoffset));
 275                         return 1;
 276                 }
 277
 278                 ret = fdt_setprop(working_fdt, nodeoffset, prop, data, len);
 279                 if (ret < 0) {
 280                         printf ("libfdt fdt_setprop(): %s\n", fdt_strerror(ret));
 281                         return 1;
 282                 }
 283
 284         /********************************************************************
 285          * Get the value of a property in the working_fdt.
 286          ********************************************************************/
 287         } else if (argv[1][0] == 'g') {
 288                 char *subcmd;           /* sub-command */
 289                 char *pathp;            /* path */
 290                 char *prop;             /* property */
 291                 char *var;              /* variable to store result */
 292                 int  nodeoffset;        /* node offset from libfdt */
 293                 const void *nodep;      /* property node pointer */
 294                 int  len = 0;           /* new length of the property */
 295
 296                 /*
 297                  * Parameters: Node path, property, optional value.
 298                  */
 299                 if (argc < 5)
 300                         return CMD_RET_USAGE;
 301
 302                 subcmd = argv[2];
 303
 304                 if (argc < 6 && subcmd[0] != 's')
 305                         return CMD_RET_USAGE;
 306
 307                 var    = argv[3];
 308                 pathp  = argv[4];
 309                 prop   = argv[5];
 310
 311                 nodeoffset = fdt_path_offset(working_fdt, pathp);
 312                 if (nodeoffset < 0) {
 313                         /*
 314                          * Not found or something else bad happened.
 315                          */
 316                         printf("libfdt fdt_path_offset() returned %s\n",
 317                                 fdt_strerror(nodeoffset));
 318                         return 1;
 319                 }
 320
 321                 if (subcmd[0] == 'n' || (subcmd[0] == 's' && argc == 5)) {
 322                         int reqIndex = -1;
 323                         int startDepth = fdt_node_depth(
 324                                 working_fdt, nodeoffset);
 325                         int curDepth = startDepth;
 326                         int curIndex = -1;
 327                         int nextNodeOffset = fdt_next_node(
 328                                 working_fdt, nodeoffset, &curDepth);
 329
 330                         if (subcmd[0] == 'n')
 331                                 reqIndex = simple_strtoul(argv[5], NULL, 16);
 332
 333                         while (curDepth > startDepth) {
 334                                 if (curDepth == startDepth + 1)
 335                                         curIndex++;
 336                                 if (subcmd[0] == 'n' && curIndex == reqIndex) {
 337                                         const char *nodeName = fdt_get_name(
 338                                             working_fdt, nextNodeOffset, NULL);
 339
 340                                         setenv(var, (char *)nodeName);
 341                                         return 0;
 342                                 }
 343                                 nextNodeOffset = fdt_next_node(
 344                                         working_fdt, nextNodeOffset, &curDepth);
 345                                 if (nextNodeOffset < 0)
 346                                         break;
 347                         }
 348                         if (subcmd[0] == 's') {
 349                                 /* get the num nodes at this level */
 350                                 char buf[11];
 351
 352                                 sprintf(buf, "%d", curIndex + 1);
 353                                 setenv(var, buf);
 354                         } else {
 355                                 /* node index not found */
 356                                 printf("libfdt node not found\n");
 357                                 return 1;
 358                         }
 359                 } else {
 360                         nodep = fdt_getprop(
 361                                 working_fdt, nodeoffset, prop, &len);
 362                         if (len == 0) {
 363                                 /* no property value */
 364                                 setenv(var, "");
 365                                 return 0;
 366                         } else if (len > 0) {
 367                                 if (subcmd[0] == 'v') {
 368                                         int ret;
 369
 370                                         ret = fdt_value_setenv(nodep, len, var);
 371                                         if (ret != 0)
 372                                                 return ret;
 373                                 } else if (subcmd[0] == 'a') {
 374                                         /* Get address */
 375                                         char buf[11];
 376
 377                                         sprintf(buf, "0x%p", nodep);
 378                                         setenv(var, buf);
 379                                 } else if (subcmd[0] == 's') {
 380                                         /* Get size */
 381                                         char buf[11];
 382
 383                                         sprintf(buf, "0x%08X", len);
 384                                         setenv(var, buf);
 385                                 } else
 386                                         return CMD_RET_USAGE;
 387                                 return 0;
 388                         } else {
 389                                 printf("libfdt fdt_getprop(): %s\n",
 390                                         fdt_strerror(len));
 391                                 return 1;
 392                         }
 393                 }
 394
 395         /*
 396          * Print (recursive) / List (single level)
 397          */
 398         } else if ((argv[1][0] == 'p') || (argv[1][0] == 'l')) {
 399                 int depth = MAX_LEVEL;  /* how deep to print */
 400                 char *pathp;            /* path */
 401                 char *prop;             /* property */
 402                 int  ret;               /* return value */
 403                 static char root[2] = "/";
 404
 405                 /*
 406                  * list is an alias for print, but limited to 1 level
 407                  */
 408                 if (argv[1][0] == 'l') {
 409                         depth = 1;
 410                 }
 411
 412                 /*
 413                  * Get the starting path.  The root node is an oddball,
 414                  * the offset is zero and has no name.
 415                  */
 416                 if (argc == 2)
 417                         pathp = root;
 418                 else
 419                         pathp = argv[2];
 420                 if (argc > 3)
 421                         prop = argv[3];
 422                 else
 423                         prop = NULL;
 424
 425                 ret = fdt_print(pathp, prop, depth);
 426                 if (ret != 0)
 427                         return ret;
 428
 429         /*
 430          * Remove a property/node
 431          */
 432         } else if (strncmp(argv[1], "rm", 2) == 0) {
 433                 int  nodeoffset;        /* node offset from libfdt */
 434                 int  err;
 435
 436                 /*
 437                  * Get the path.  The root node is an oddball, the offset
 438                  * is zero and has no name.
 439                  */
 440                 nodeoffset = fdt_path_offset (working_fdt, argv[2]);
 441                 if (nodeoffset < 0) {
 442                         /*
 443                          * Not found or something else bad happened.
 444                          */
 445                         printf ("libfdt fdt_path_offset() returned %s\n",
 446                                 fdt_strerror(nodeoffset));
 447                         return 1;
 448                 }
 449                 /*
 450                  * Do the delete.  A fourth parameter means delete a property,
 451                  * otherwise delete the node.
 452                  */
 453                 if (argc > 3) {
 454                         err = fdt_delprop(working_fdt, nodeoffset, argv[3]);
 455                         if (err < 0) {
 456                                 printf("libfdt fdt_delprop():  %s\n",
 457                                         fdt_strerror(err));
 458                                 return err;
 459                         }
 460                 } else {
 461                         err = fdt_del_node(working_fdt, nodeoffset);
 462                         if (err < 0) {
 463                                 printf("libfdt fdt_del_node():  %s\n",
 464                                         fdt_strerror(err));
 465                                 return err;
 466                         }
 467                 }
 468
 469         /*
 470          * Display header info
 471          */
 472         } else if (argv[1][0] == 'h') {
 473                 u32 version = fdt_version(working_fdt);
 474                 printf("magic:\t\t\t0x%x\n", fdt_magic(working_fdt));
 475                 printf("totalsize:\t\t0x%x (%d)\n", fdt_totalsize(working_fdt),
 476                        fdt_totalsize(working_fdt));
 477                 printf("off_dt_struct:\t\t0x%x\n",
 478                        fdt_off_dt_struct(working_fdt));
 479                 printf("off_dt_strings:\t\t0x%x\n",
 480                        fdt_off_dt_strings(working_fdt));
 481                 printf("off_mem_rsvmap:\t\t0x%x\n",
 482                        fdt_off_mem_rsvmap(working_fdt));
 483                 printf("version:\t\t%d\n", version);
 484                 printf("last_comp_version:\t%d\n",
 485                        fdt_last_comp_version(working_fdt));
 486                 if (version >= 2)
 487                         printf("boot_cpuid_phys:\t0x%x\n",
 488                                 fdt_boot_cpuid_phys(working_fdt));
 489                 if (version >= 3)
 490                         printf("size_dt_strings:\t0x%x\n",
 491                                 fdt_size_dt_strings(working_fdt));
 492                 if (version >= 17)
 493                         printf("size_dt_struct:\t\t0x%x\n",
 494                                 fdt_size_dt_struct(working_fdt));
 495                 printf("number mem_rsv:\t\t0x%x\n",
 496                        fdt_num_mem_rsv(working_fdt));
 497                 printf("\n");
 498
 499         /*
 500          * Set boot cpu id
 501          */
 502         } else if (strncmp(argv[1], "boo", 3) == 0) {
 503                 unsigned long tmp = simple_strtoul(argv[2], NULL, 16);
 504                 fdt_set_boot_cpuid_phys(working_fdt, tmp);
 505
 506         /*
 507          * memory command
 508          */
 509         } else if (strncmp(argv[1], "me", 2) == 0) {
 510                 uint64_t addr, size;
 511                 int err;
 512                 addr = simple_strtoull(argv[2], NULL, 16);
 513                 size = simple_strtoull(argv[3], NULL, 16);
 514                 err = fdt_fixup_memory(working_fdt, addr, size);
 515                 if (err < 0)
 516                         return err;
 517
 518         /*
 519          * mem reserve commands
 520          */
 521         } else if (strncmp(argv[1], "rs", 2) == 0) {
 522                 if (argv[2][0] == 'p') {
 523                         uint64_t addr, size;
 524                         int total = fdt_num_mem_rsv(working_fdt);
 525                         int j, err;
 526                         printf("index\t\t   start\t\t    size\n");
 527                         printf("-------------------------------"
 528                                 "-----------------\n");
 529                         for (j = 0; j < total; j++) {
 530                                 err = fdt_get_mem_rsv(working_fdt, j, &addr, &size);
 531                                 if (err < 0) {
 532                                         printf("libfdt fdt_get_mem_rsv():  %s\n",
 533                                                         fdt_strerror(err));
 534                                         return err;
 535                                 }
 536                                 printf("    %x\t%08x%08x\t%08x%08x\n", j,
 537                                         (u32)(addr >> 32),
 538                                         (u32)(addr & 0xffffffff),
 539                                         (u32)(size >> 32),
 540                                         (u32)(size & 0xffffffff));
 541                         }
 542                 } else if (argv[2][0] == 'a') {
 543                         uint64_t addr, size;
 544                         int err;
 545                         addr = simple_strtoull(argv[3], NULL, 16);
 546                         size = simple_strtoull(argv[4], NULL, 16);
 547                         err = fdt_add_mem_rsv(working_fdt, addr, size);
 548
 549                         if (err < 0) {
 550                                 printf("libfdt fdt_add_mem_rsv():  %s\n",
 551                                         fdt_strerror(err));
 552                                 return err;
 553                         }
 554                 } else if (argv[2][0] == 'd') {
 555                         unsigned long idx = simple_strtoul(argv[3], NULL, 16);
 556                         int err = fdt_del_mem_rsv(working_fdt, idx);
 557
 558                         if (err < 0) {
 559                                 printf("libfdt fdt_del_mem_rsv():  %s\n",
 560                                         fdt_strerror(err));
 561                                 return err;
 562                         }
 563                 } else {
 564                         /* Unrecognized command */
 565                         return CMD_RET_USAGE;
 566                 }
 567         }
 568 #ifdef CONFIG_OF_BOARD_SETUP
 569         /* Call the board-specific fixup routine */
 570         else if (strncmp(argv[1], "boa", 3) == 0)
 571                 ft_board_setup(working_fdt, gd->bd);
 572 #endif
 573         /* Create a chosen node */
 574         else if (argv[1][0] == 'c') {
 575                 unsigned long initrd_start = 0, initrd_end = 0;
 576
 577                 if ((argc != 2) && (argc != 4))
 578                         return CMD_RET_USAGE;
 579
 580                 if (argc == 4) {
 581                         initrd_start = simple_strtoul(argv[2], NULL, 16);
 582                         initrd_end = simple_strtoul(argv[3], NULL, 16);
 583                 }
 584
 585                 fdt_chosen(working_fdt, 1);
 586                 fdt_initrd(working_fdt, initrd_start, initrd_end, 1);
 587         }
 588         /* resize the fdt */
 589         else if (strncmp(argv[1], "re", 2) == 0) {
 590                 fdt_resize(working_fdt);
 591         }
 592         else {
 593                 /* Unrecognized command */
 594                 return CMD_RET_USAGE;
 595         }
 596
 597         return 0;
 598 }
 599
 600 /****************************************************************************/
 601
 602 static int fdt_valid(void)
 603 {
 604         int  err;
 605
 606         if (working_fdt == NULL) {
 607                 printf ("The address of the fdt is invalid (NULL).\n");
 608                 return 0;
 609         }
 610
 611         err = fdt_check_header(working_fdt);
 612         if (err == 0)
 613                 return 1;       /* valid */
 614
 615         if (err < 0) {
 616                 printf("libfdt fdt_check_header(): %s", fdt_strerror(err));
 617                 /*
 618                  * Be more informative on bad version.
 619                  */
 620                 if (err == -FDT_ERR_BADVERSION) {
 621                         if (fdt_version(working_fdt) <
 622                             FDT_FIRST_SUPPORTED_VERSION) {
 623                                 printf (" - too old, fdt %d < %d",
 624                                         fdt_version(working_fdt),
 625                                         FDT_FIRST_SUPPORTED_VERSION);
 626                                 working_fdt = NULL;
 627                         }
 628                         if (fdt_last_comp_version(working_fdt) >
 629                             FDT_LAST_SUPPORTED_VERSION) {
 630                                 printf (" - too new, fdt %d > %d",
 631                                         fdt_version(working_fdt),
 632                                         FDT_LAST_SUPPORTED_VERSION);
 633                                 working_fdt = NULL;
 634                         }
 635                         return 0;
 636                 }
 637                 printf("\n");
 638                 return 0;
 639         }
 640         return 1;
 641 }
 642
 643 /****************************************************************************/
 644
 645 /*
 646  * Parse the user's input, partially heuristic.  Valid formats:
 647  * <0x00112233 4 05>    - an array of cells.  Numbers follow standard
 648  *                      C conventions.
 649  * [00 11 22 .. nn] - byte stream
 650  * "string"     - If the the value doesn't start with "<" or "[", it is
 651  *                      treated as a string.  Note that the quotes are
 652  *                      stripped by the parser before we get the string.
 653  * newval: An array of strings containing the new property as specified
 654  *      on the command line
 655  * count: The number of strings in the array
 656  * data: A bytestream to be placed in the property
 657  * len: The length of the resulting bytestream
 658  */
 659 static int fdt_parse_prop(char * const *newval, int count, char *data, int *len)
 660 {
 661         char *cp;               /* temporary char pointer */
 662         char *newp;             /* temporary newval char pointer */
 663         unsigned long tmp;      /* holds converted values */
 664         int stridx = 0;
 665
 666         *len = 0;
 667         newp = newval[0];
 668
 669         /* An array of cells */
 670         if (*newp == '<') {
 671                 newp++;
 672                 while ((*newp != '>') && (stridx < count)) {
 673                         /*
 674                          * Keep searching until we find that last ">"
 675                          * That way users don't have to escape the spaces
 676                          */
 677                         if (*newp == '\0') {
 678                                 newp = newval[++stridx];
 679                                 continue;
 680                         }
 681
 682                         cp = newp;
 683                         tmp = simple_strtoul(cp, &newp, 0);
 684                         *(__be32 *)data = __cpu_to_be32(tmp);
 685                         data  += 4;
 686                         *len += 4;
 687
 688                         /* If the ptr didn't advance, something went wrong */
 689                         if ((newp - cp) <= 0) {
 690                                 printf("Sorry, I could not convert \"%s\"\n",
 691                                         cp);
 692                                 return 1;
 693                         }
 694
 695                         while (*newp == ' ')
 696                                 newp++;
 697                 }
 698
 699                 if (*newp != '>') {
 700                         printf("Unexpected character '%c'\n", *newp);
 701                         return 1;
 702                 }
 703         } else if (*newp == '[') {
 704                 /*
 705                  * Byte stream.  Convert the values.
 706                  */
 707                 newp++;
 708                 while ((stridx < count) && (*newp != ']')) {
 709                         while (*newp == ' ')
 710                                 newp++;
 711                         if (*newp == '\0') {
 712                                 newp = newval[++stridx];
 713                                 continue;
 714                         }
 715                         if (!isxdigit(*newp))
 716                                 break;
 717                         tmp = simple_strtoul(newp, &newp, 16);
 718                         *data++ = tmp & 0xFF;
 719                         *len    = *len + 1;
 720                 }
 721                 if (*newp != ']') {
 722                         printf("Unexpected character '%c'\n", *newp);
 723                         return 1;
 724                 }
 725         } else {
 726                 /*
 727                  * Assume it is one or more strings.  Copy it into our
 728                  * data area for convenience (including the
 729                  * terminating '\0's).
 730                  */
 731                 while (stridx < count) {
 732                         size_t length = strlen(newp) + 1;
 733                         strcpy(data, newp);
 734                         data += length;
 735                         *len += length;
 736                         newp = newval[++stridx];
 737                 }
 738         }
 739         return 0;
 740 }
 741
 742 /****************************************************************************/
 743
 744 /*
 745  * Heuristic to guess if this is a string or concatenated strings.
 746  */
 747
 748 static int is_printable_string(const void *data, int len)
 749 {
 750         const char *s = data;
 751
 752         /* zero length is not */
 753         if (len == 0)
 754                 return 0;
 755
 756         /* must terminate with zero or '\n' */
 757         if (s[len - 1] != '\0' && s[len - 1] != '\n')
 758                 return 0;
 759
 760         /* printable or a null byte (concatenated strings) */
 761         while (((*s == '\0') || isprint(*s) || isspace(*s)) && (len > 0)) {
 762                 /*
 763                  * If we see a null, there are three possibilities:
 764                  * 1) If len == 1, it is the end of the string, printable
 765                  * 2) Next character also a null, not printable.
 766                  * 3) Next character not a null, continue to check.
 767                  */
 768                 if (s[0] == '\0') {
 769                         if (len == 1)
 770                                 return 1;
 771                         if (s[1] == '\0')
 772                                 return 0;
 773                 }
 774                 s++;
 775                 len--;
 776         }
 777
 778         /* Not the null termination, or not done yet: not printable */
 779         if (*s != '\0' || (len != 0))
 780                 return 0;
 781
 782         return 1;
 783 }
 784
 785
 786 /*
 787  * Print the property in the best format, a heuristic guess.  Print as
 788  * a string, concatenated strings, a byte, word, double word, or (if all
 789  * else fails) it is printed as a stream of bytes.
 790  */
 791 static void print_data(const void *data, int len)
 792 {
 793         int j;
 794
 795         /* no data, don't print */
 796         if (len == 0)
 797                 return;
 798
 799         /*
 800          * It is a string, but it may have multiple strings (embedded '\0's).
 801          */
 802         if (is_printable_string(data, len)) {
 803                 puts("\"");
 804                 j = 0;
 805                 while (j < len) {
 806                         if (j > 0)
 807                                 puts("\", \"");
 808                         puts(data);
 809                         j    += strlen(data) + 1;
 810                         data += strlen(data) + 1;
 811                 }
 812                 puts("\"");
 813                 return;
 814         }
 815
 816         if ((len %4) == 0) {
 817                 if (len > CONFIG_CMD_FDT_MAX_DUMP)
 818                         printf("* 0x%p [0x%08x]", data, len);
 819                 else {
 820                         const __be32 *p;
 821
 822                         printf("<");
 823                         for (j = 0, p = data; j < len/4; j++)
 824                                 printf("0x%08x%s", fdt32_to_cpu(p[j]),
 825                                         j < (len/4 - 1) ? " " : "");
 826                         printf(">");
 827                 }
 828         } else { /* anything else... hexdump */
 829                 if (len > CONFIG_CMD_FDT_MAX_DUMP)
 830                         printf("* 0x%p [0x%08x]", data, len);
 831                 else {
 832                         const u8 *s;
 833
 834                         printf("[");
 835                         for (j = 0, s = data; j < len; j++)
 836                                 printf("%02x%s", s[j], j < len - 1 ? " " : "");
 837                         printf("]");
 838                 }
 839         }
 840 }
 841
 842 /****************************************************************************/
 843
 844 /*
 845  * Recursively print (a portion of) the working_fdt.  The depth parameter
 846  * determines how deeply nested the fdt is printed.
 847  */
 848 static int fdt_print(const char *pathp, char *prop, int depth)
 849 {
 850         static char tabs[MAX_LEVEL+1] =
 851                 "\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t"
 852                 "\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t";
 853         const void *nodep;      /* property node pointer */
 854         int  nodeoffset;        /* node offset from libfdt */
 855         int  nextoffset;        /* next node offset from libfdt */
 856         uint32_t tag;           /* tag */
 857         int  len;               /* length of the property */
 858         int  level = 0;         /* keep track of nesting level */
 859         const struct fdt_property *fdt_prop;
 860
 861         nodeoffset = fdt_path_offset (working_fdt, pathp);
 862         if (nodeoffset < 0) {
 863                 /*
 864                  * Not found or something else bad happened.
 865                  */
 866                 printf ("libfdt fdt_path_offset() returned %s\n",
 867                         fdt_strerror(nodeoffset));
 868                 return 1;
 869         }
 870         /*
 871          * The user passed in a property as well as node path.
 872          * Print only the given property and then return.
 873          */
 874         if (prop) {
 875                 nodep = fdt_getprop (working_fdt, nodeoffset, prop, &len);
 876                 if (len == 0) {
 877                         /* no property value */
 878                         printf("%s %s\n", pathp, prop);
 879                         return 0;
 880                 } else if (len > 0) {
 881                         printf("%s = ", prop);
 882                         print_data (nodep, len);
 883                         printf("\n");
 884                         return 0;
 885                 } else {
 886                         printf ("libfdt fdt_getprop(): %s\n",
 887                                 fdt_strerror(len));
 888                         return 1;
 889                 }
 890         }
 891
 892         /*
 893          * The user passed in a node path and no property,
 894          * print the node and all subnodes.
 895          */
 896         while(level >= 0) {
 897                 tag = fdt_next_tag(working_fdt, nodeoffset, &nextoffset);
 898                 switch(tag) {
 899                 case FDT_BEGIN_NODE:
 900                         pathp = fdt_get_name(working_fdt, nodeoffset, NULL);
 901                         if (level <= depth) {
 902                                 if (pathp == NULL)
 903                                         pathp = "/* NULL pointer error */";
 904                                 if (*pathp == '\0')
 905                                         pathp = "/";    /* root is nameless */
 906                                 printf("%s%s {\n",
 907                                         &tabs[MAX_LEVEL - level], pathp);
 908                         }
 909                         level++;
 910                         if (level >= MAX_LEVEL) {
 911                                 printf("Nested too deep, aborting.\n");
 912                                 return 1;
 913                         }
 914                         break;
 915                 case FDT_END_NODE:
 916                         level--;
 917                         if (level <= depth)
 918                                 printf("%s};\n", &tabs[MAX_LEVEL - level]);
 919                         if (level == 0) {
 920                                 level = -1;             /* exit the loop */
 921                         }
 922                         break;
 923                 case FDT_PROP:
 924                         fdt_prop = fdt_offset_ptr(working_fdt, nodeoffset,
 925                                         sizeof(*fdt_prop));
 926                         pathp    = fdt_string(working_fdt,
 927                                         fdt32_to_cpu(fdt_prop->nameoff));
 928                         len      = fdt32_to_cpu(fdt_prop->len);
 929                         nodep    = fdt_prop->data;
 930                         if (len < 0) {
 931                                 printf ("libfdt fdt_getprop(): %s\n",
 932                                         fdt_strerror(len));
 933                                 return 1;
 934                         } else if (len == 0) {
 935                                 /* the property has no value */
 936                                 if (level <= depth)
 937                                         printf("%s%s;\n",
 938                                                 &tabs[MAX_LEVEL - level],
 939                                                 pathp);
 940                         } else {
 941                                 if (level <= depth) {
 942                                         printf("%s%s = ",
 943                                                 &tabs[MAX_LEVEL - level],
 944                                                 pathp);
 945                                         print_data (nodep, len);
 946                                         printf(";\n");
 947                                 }
 948                         }
 949                         break;
 950                 case FDT_NOP:
 951                         printf("%s/* NOP */\n", &tabs[MAX_LEVEL - level]);
 952                         break;
 953                 case FDT_END:
 954                         return 1;
 955                 default:
 956                         if (level <= depth)
 957                                 printf("Unknown tag 0x%08X\n", tag);
 958                         return 1;
 959                 }
 960                 nodeoffset = nextoffset;
 961         }
 962         return 0;
 963 }
 964
 965 /********************************************************************/
 966 #ifdef CONFIG_SYS_LONGHELP
 967 static char fdt_help_text[] =
 968         "addr   <addr> [<length>]        - Set the fdt location to <addr>\n"
 969 #ifdef CONFIG_OF_BOARD_SETUP
 970         "fdt boardsetup                      - Do board-specific set up\n"
 971 #endif
 972         "fdt move   <fdt> <newaddr> <length> - Copy the fdt to <addr> and make it active\n"
 973         "fdt resize                          - Resize fdt to size + padding to 4k addr\n"
 974         "fdt print  <path> [<prop>]          - Recursive print starting at <path>\n"
 975         "fdt list   <path> [<prop>]          - Print one level starting at <path>\n"
 976         "fdt get value <var> <path> <prop>   - Get <property> and store in <var>\n"
 977         "fdt get name <var> <path> <index>   - Get name of node <index> and store in <var>\n"
 978         "fdt get addr <var> <path> <prop>    - Get start address of <property> and store in <var>\n"
 979         "fdt get size <var> <path> [<prop>]  - Get size of [<property>] or num nodes and store in <var>\n"
 980         "fdt set    <path> <prop> [<val>]    - Set <property> [to <val>]\n"
 981         "fdt mknode <path> <node>            - Create a new node after <path>\n"
 982         "fdt rm     <path> [<prop>]          - Delete the node or <property>\n"
 983         "fdt header                          - Display header info\n"
 984         "fdt bootcpu <id>                    - Set boot cpuid\n"
 985         "fdt memory <addr> <size>            - Add/Update memory node\n"
 986         "fdt rsvmem print                    - Show current mem reserves\n"
 987         "fdt rsvmem add <addr> <size>        - Add a mem reserve\n"
 988         "fdt rsvmem delete <index>           - Delete a mem reserves\n"
 989         "fdt chosen [<start> <end>]          - Add/update the /chosen branch in the tree\n"
 990         "                                        <start>/<end> - initrd start/end addr\n"
 991         "NOTE: Dereference aliases by omiting the leading '/', "
 992                 "e.g. fdt print ethernet0.";
 993 #endif
 994
 995 U_BOOT_CMD(
 996         fdt,    255,    0,      do_fdt,
 997         "flattened device tree utility commands", fdt_help_text
 998 );