common/cmd_fdt.c

   1 /*
   2  * (C) Copyright 2007
   3  * Gerald Van Baren, Custom IDEAS, vanbaren@cideas.com
   4  * Based on code written by:
   5  *   Pantelis Antoniou <pantelis.antoniou@gmail.com> and
   6  *   Matthew McClintock <msm@freescale.com>
   7  *
   8  * See file CREDITS for list of people who contributed to this
   9  * project.
  10  *
  11  * This program is free software; you can redistribute it and/or
  12  * modify it under the terms of the GNU General Public License as
  13  * published by the Free Software Foundation; either version 2 of
  14  * the License, or (at your option) any later version.
  15  *
  16  * This program is distributed in the hope that it will be useful,
  17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19  * GNU General Public License for more details.
  20  *
  21  * You should have received a copy of the GNU General Public License
  22  * along with this program; if not, write to the Free Software
  23  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  24  * MA 02111-1307 USA
  25  */
  26
  27 #include <common.h>
  28 #include <command.h>
  29 #include <linux/ctype.h>
  30 #include <linux/types.h>
  31 #include <asm/global_data.h>
  32 #include <fdt.h>
  33 #include <libfdt.h>
  34 #include <fdt_support.h>
  35
  36 #define MAX_LEVEL       32              /* how deeply nested we will go */
  37 #define SCRATCHPAD      1024            /* bytes of scratchpad memory */
  38 #ifndef CONFIG_CMD_FDT_MAX_DUMP
  39 #define CONFIG_CMD_FDT_MAX_DUMP 64
  40 #endif
  41
  42 /*
  43  * Global data (for the gd->bd)
  44  */
  45 DECLARE_GLOBAL_DATA_PTR;
  46
  47 static int fdt_valid(void);
  48 static int fdt_parse_prop(char *const*newval, int count, char *data, int *len);
  49 static int fdt_print(const char *pathp, char *prop, int depth);
  50 static int is_printable_string(const void *data, int len);
  51
  52 /*
  53  * The working_fdt points to our working flattened device tree.
  54  */
  55 struct fdt_header *working_fdt;
  56
  57 void set_working_fdt_addr(void *addr)
  58 {
  59         char buf[17];
  60
  61         working_fdt = addr;
  62
  63         sprintf(buf, "%lx", (unsigned long)addr);
  64         setenv("fdtaddr", buf);
  65 }
  66
  67 /*
  68  * Get a value from the fdt and format it to be set in the environment
  69  */
  70 static int fdt_value_setenv(const void *nodep, int len, const char *var)
  71 {
  72         if (is_printable_string(nodep, len))
  73                 setenv(var, (void *)nodep);
  74         else if (len == 4) {
  75                 char buf[11];
  76
  77                 sprintf(buf, "0x%08X", *(uint32_t *)nodep);
  78                 setenv(var, buf);
  79         } else if (len%4 == 0 && len <= 20) {
  80                 /* Needed to print things like sha1 hashes. */
  81                 char buf[41];
  82                 int i;
  83
  84                 for (i = 0; i < len; i += sizeof(unsigned int))
  85                         sprintf(buf + (i * 2), "%08x",
  86                                 *(unsigned int *)(nodep + i));
  87                 setenv(var, buf);
  88         } else {
  89                 printf("error: unprintable value\n");
  90                 return 1;
  91         }
  92         return 0;
  93 }
  94
  95 /*
  96  * Flattened Device Tree command, see the help for parameter definitions.
  97  */
  98 static int do_fdt(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
  99 {
 100         if (argc < 2)
 101                 return CMD_RET_USAGE;
 102
 103         /*
 104          * Set the address of the fdt
 105          */
 106         if (argv[1][0] == 'a') {
 107                 unsigned long addr;
 108                 /*
 109                  * Set the address [and length] of the fdt.
 110                  */
 111                 if (argc == 2) {
 112                         if (!fdt_valid()) {
 113                                 return 1;
 114                         }
 115                         printf("The address of the fdt is %p\n", working_fdt);
 116                         return 0;
 117                 }
 118
 119                 addr = simple_strtoul(argv[2], NULL, 16);
 120                 set_working_fdt_addr((void *)addr);
 121
 122                 if (!fdt_valid()) {
 123                         return 1;
 124                 }
 125
 126                 if (argc >= 4) {
 127                         int  len;
 128                         int  err;
 129                         /*
 130                          * Optional new length
 131                          */
 132                         len = simple_strtoul(argv[3], NULL, 16);
 133                         if (len < fdt_totalsize(working_fdt)) {
 134                                 printf ("New length %d < existing length %d, "
 135                                         "ignoring.\n",
 136                                         len, fdt_totalsize(working_fdt));
 137                         } else {
 138                                 /*
 139                                  * Open in place with a new length.
 140                                  */
 141                                 err = fdt_open_into(working_fdt, working_fdt, len);
 142                                 if (err != 0) {
 143                                         printf ("libfdt fdt_open_into(): %s\n",
 144                                                 fdt_strerror(err));
 145                                 }
 146                         }
 147                 }
 148
 149                 return CMD_RET_SUCCESS;
 150         }
 151
 152         if (!working_fdt) {
 153                 puts(
 154                         "No FDT memory address configured. Please configure\n"
 155                         "the FDT address via \"fdt addr <address>\" command.\n"
 156                         "Aborting!\n");
 157                 return CMD_RET_FAILURE;
 158         }
 159
 160         /*
 161          * Move the working_fdt
 162          */
 163         if (strncmp(argv[1], "mo", 2) == 0) {
 164                 struct fdt_header *newaddr;
 165                 int  len;
 166                 int  err;
 167
 168                 if (argc < 4)
 169                         return CMD_RET_USAGE;
 170
 171                 /*
 172                  * Set the address and length of the fdt.
 173                  */
 174                 working_fdt = (struct fdt_header *)simple_strtoul(argv[2], NULL, 16);
 175                 if (!fdt_valid()) {
 176                         return 1;
 177                 }
 178
 179                 newaddr = (struct fdt_header *)simple_strtoul(argv[3],NULL,16);
 180
 181                 /*
 182                  * If the user specifies a length, use that.  Otherwise use the
 183                  * current length.
 184                  */
 185                 if (argc <= 4) {
 186                         len = fdt_totalsize(working_fdt);
 187                 } else {
 188                         len = simple_strtoul(argv[4], NULL, 16);
 189                         if (len < fdt_totalsize(working_fdt)) {
 190                                 printf ("New length 0x%X < existing length "
 191                                         "0x%X, aborting.\n",
 192                                         len, fdt_totalsize(working_fdt));
 193                                 return 1;
 194                         }
 195                 }
 196
 197                 /*
 198                  * Copy to the new location.
 199                  */
 200                 err = fdt_open_into(working_fdt, newaddr, len);
 201                 if (err != 0) {
 202                         printf ("libfdt fdt_open_into(): %s\n",
 203                                 fdt_strerror(err));
 204                         return 1;
 205                 }
 206                 working_fdt = newaddr;
 207
 208         /*
 209          * Make a new node
 210          */
 211         } else if (strncmp(argv[1], "mk", 2) == 0) {
 212                 char *pathp;            /* path */
 213                 char *nodep;            /* new node to add */
 214                 int  nodeoffset;        /* node offset from libfdt */
 215                 int  err;
 216
 217                 /*
 218                  * Parameters: Node path, new node to be appended to the path.
 219                  */
 220                 if (argc < 4)
 221                         return CMD_RET_USAGE;
 222
 223                 pathp = argv[2];
 224                 nodep = argv[3];
 225
 226                 nodeoffset = fdt_path_offset (working_fdt, pathp);
 227                 if (nodeoffset < 0) {
 228                         /*
 229                          * Not found or something else bad happened.
 230                          */
 231                         printf ("libfdt fdt_path_offset() returned %s\n",
 232                                 fdt_strerror(nodeoffset));
 233                         return 1;
 234                 }
 235                 err = fdt_add_subnode(working_fdt, nodeoffset, nodep);
 236                 if (err < 0) {
 237                         printf ("libfdt fdt_add_subnode(): %s\n",
 238                                 fdt_strerror(err));
 239                         return 1;
 240                 }
 241
 242         /*
 243          * Set the value of a property in the working_fdt.
 244          */
 245         } else if (argv[1][0] == 's') {
 246                 char *pathp;            /* path */
 247                 char *prop;             /* property */
 248                 int  nodeoffset;        /* node offset from libfdt */
 249                 static char data[SCRATCHPAD];   /* storage for the property */
 250                 int  len;               /* new length of the property */
 251                 int  ret;               /* return value */
 252
 253                 /*
 254                  * Parameters: Node path, property, optional value.
 255                  */
 256                 if (argc < 4)
 257                         return CMD_RET_USAGE;
 258
 259                 pathp  = argv[2];
 260                 prop   = argv[3];
 261                 if (argc == 4) {
 262                         len = 0;
 263                 } else {
 264                         ret = fdt_parse_prop(&argv[4], argc - 4, data, &len);
 265                         if (ret != 0)
 266                                 return ret;
 267                 }
 268
 269                 nodeoffset = fdt_path_offset (working_fdt, pathp);
 270                 if (nodeoffset < 0) {
 271                         /*
 272                          * Not found or something else bad happened.
 273                          */
 274                         printf ("libfdt fdt_path_offset() returned %s\n",
 275                                 fdt_strerror(nodeoffset));
 276                         return 1;
 277                 }
 278
 279                 ret = fdt_setprop(working_fdt, nodeoffset, prop, data, len);
 280                 if (ret < 0) {
 281                         printf ("libfdt fdt_setprop(): %s\n", fdt_strerror(ret));
 282                         return 1;
 283                 }
 284
 285         /********************************************************************
 286          * Get the value of a property in the working_fdt.
 287          ********************************************************************/
 288         } else if (argv[1][0] == 'g') {
 289                 char *subcmd;           /* sub-command */
 290                 char *pathp;            /* path */
 291                 char *prop;             /* property */
 292                 char *var;              /* variable to store result */
 293                 int  nodeoffset;        /* node offset from libfdt */
 294                 const void *nodep;      /* property node pointer */
 295                 int  len = 0;           /* new length of the property */
 296
 297                 /*
 298                  * Parameters: Node path, property, optional value.
 299                  */
 300                 if (argc < 5)
 301                         return CMD_RET_USAGE;
 302
 303                 subcmd = argv[2];
 304
 305                 if (argc < 6 && subcmd[0] != 's')
 306                         return CMD_RET_USAGE;
 307
 308                 var    = argv[3];
 309                 pathp  = argv[4];
 310                 prop   = argv[5];
 311
 312                 nodeoffset = fdt_path_offset(working_fdt, pathp);
 313                 if (nodeoffset < 0) {
 314                         /*
 315                          * Not found or something else bad happened.
 316                          */
 317                         printf("libfdt fdt_path_offset() returned %s\n",
 318                                 fdt_strerror(nodeoffset));
 319                         return 1;
 320                 }
 321
 322                 if (subcmd[0] == 'n' || (subcmd[0] == 's' && argc == 5)) {
 323                         int reqIndex = -1;
 324                         int startDepth = fdt_node_depth(
 325                                 working_fdt, nodeoffset);
 326                         int curDepth = startDepth;
 327                         int curIndex = -1;
 328                         int nextNodeOffset = fdt_next_node(
 329                                 working_fdt, nodeoffset, &curDepth);
 330
 331                         if (subcmd[0] == 'n')
 332                                 reqIndex = simple_strtoul(argv[5], NULL, 16);
 333
 334                         while (curDepth > startDepth) {
 335                                 if (curDepth == startDepth + 1)
 336                                         curIndex++;
 337                                 if (subcmd[0] == 'n' && curIndex == reqIndex) {
 338                                         const char *nodeName = fdt_get_name(
 339                                             working_fdt, nextNodeOffset, NULL);
 340
 341                                         setenv(var, (char *)nodeName);
 342                                         return 0;
 343                                 }
 344                                 nextNodeOffset = fdt_next_node(
 345                                         working_fdt, nextNodeOffset, &curDepth);
 346                                 if (nextNodeOffset < 0)
 347                                         break;
 348                         }
 349                         if (subcmd[0] == 's') {
 350                                 /* get the num nodes at this level */
 351                                 char buf[11];
 352
 353                                 sprintf(buf, "%d", curIndex + 1);
 354                                 setenv(var, buf);
 355                         } else {
 356                                 /* node index not found */
 357                                 printf("libfdt node not found\n");
 358                                 return 1;
 359                         }
 360                 } else {
 361                         nodep = fdt_getprop(
 362                                 working_fdt, nodeoffset, prop, &len);
 363                         if (len == 0) {
 364                                 /* no property value */
 365                                 setenv(var, "");
 366                                 return 0;
 367                         } else if (len > 0) {
 368                                 if (subcmd[0] == 'v') {
 369                                         int ret;
 370
 371                                         ret = fdt_value_setenv(nodep, len, var);
 372                                         if (ret != 0)
 373                                                 return ret;
 374                                 } else if (subcmd[0] == 'a') {
 375                                         /* Get address */
 376                                         char buf[11];
 377
 378                                         sprintf(buf, "0x%p", nodep);
 379                                         setenv(var, buf);
 380                                 } else if (subcmd[0] == 's') {
 381                                         /* Get size */
 382                                         char buf[11];
 383
 384                                         sprintf(buf, "0x%08X", len);
 385                                         setenv(var, buf);
 386                                 } else
 387                                         return CMD_RET_USAGE;
 388                                 return 0;
 389                         } else {
 390                                 printf("libfdt fdt_getprop(): %s\n",
 391                                         fdt_strerror(len));
 392                                 return 1;
 393                         }
 394                 }
 395
 396         /*
 397          * Print (recursive) / List (single level)
 398          */
 399         } else if ((argv[1][0] == 'p') || (argv[1][0] == 'l')) {
 400                 int depth = MAX_LEVEL;  /* how deep to print */
 401                 char *pathp;            /* path */
 402                 char *prop;             /* property */
 403                 int  ret;               /* return value */
 404                 static char root[2] = "/";
 405
 406                 /*
 407                  * list is an alias for print, but limited to 1 level
 408                  */
 409                 if (argv[1][0] == 'l') {
 410                         depth = 1;
 411                 }
 412
 413                 /*
 414                  * Get the starting path.  The root node is an oddball,
 415                  * the offset is zero and has no name.
 416                  */
 417                 if (argc == 2)
 418                         pathp = root;
 419                 else
 420                         pathp = argv[2];
 421                 if (argc > 3)
 422                         prop = argv[3];
 423                 else
 424                         prop = NULL;
 425
 426                 ret = fdt_print(pathp, prop, depth);
 427                 if (ret != 0)
 428                         return ret;
 429
 430         /*
 431          * Remove a property/node
 432          */
 433         } else if (strncmp(argv[1], "rm", 2) == 0) {
 434                 int  nodeoffset;        /* node offset from libfdt */
 435                 int  err;
 436
 437                 /*
 438                  * Get the path.  The root node is an oddball, the offset
 439                  * is zero and has no name.
 440                  */
 441                 nodeoffset = fdt_path_offset (working_fdt, argv[2]);
 442                 if (nodeoffset < 0) {
 443                         /*
 444                          * Not found or something else bad happened.
 445                          */
 446                         printf ("libfdt fdt_path_offset() returned %s\n",
 447                                 fdt_strerror(nodeoffset));
 448                         return 1;
 449                 }
 450                 /*
 451                  * Do the delete.  A fourth parameter means delete a property,
 452                  * otherwise delete the node.
 453                  */
 454                 if (argc > 3) {
 455                         err = fdt_delprop(working_fdt, nodeoffset, argv[3]);
 456                         if (err < 0) {
 457                                 printf("libfdt fdt_delprop():  %s\n",
 458                                         fdt_strerror(err));
 459                                 return err;
 460                         }
 461                 } else {
 462                         err = fdt_del_node(working_fdt, nodeoffset);
 463                         if (err < 0) {
 464                                 printf("libfdt fdt_del_node():  %s\n",
 465                                         fdt_strerror(err));
 466                                 return err;
 467                         }
 468                 }
 469
 470         /*
 471          * Display header info
 472          */
 473         } else if (argv[1][0] == 'h') {
 474                 u32 version = fdt_version(working_fdt);
 475                 printf("magic:\t\t\t0x%x\n", fdt_magic(working_fdt));
 476                 printf("totalsize:\t\t0x%x (%d)\n", fdt_totalsize(working_fdt),
 477                        fdt_totalsize(working_fdt));
 478                 printf("off_dt_struct:\t\t0x%x\n",
 479                        fdt_off_dt_struct(working_fdt));
 480                 printf("off_dt_strings:\t\t0x%x\n",
 481                        fdt_off_dt_strings(working_fdt));
 482                 printf("off_mem_rsvmap:\t\t0x%x\n",
 483                        fdt_off_mem_rsvmap(working_fdt));
 484                 printf("version:\t\t%d\n", version);
 485                 printf("last_comp_version:\t%d\n",
 486                        fdt_last_comp_version(working_fdt));
 487                 if (version >= 2)
 488                         printf("boot_cpuid_phys:\t0x%x\n",
 489                                 fdt_boot_cpuid_phys(working_fdt));
 490                 if (version >= 3)
 491                         printf("size_dt_strings:\t0x%x\n",
 492                                 fdt_size_dt_strings(working_fdt));
 493                 if (version >= 17)
 494                         printf("size_dt_struct:\t\t0x%x\n",
 495                                 fdt_size_dt_struct(working_fdt));
 496                 printf("number mem_rsv:\t\t0x%x\n",
 497                        fdt_num_mem_rsv(working_fdt));
 498                 printf("\n");
 499
 500         /*
 501          * Set boot cpu id
 502          */
 503         } else if (strncmp(argv[1], "boo", 3) == 0) {
 504                 unsigned long tmp = simple_strtoul(argv[2], NULL, 16);
 505                 fdt_set_boot_cpuid_phys(working_fdt, tmp);
 506
 507         /*
 508          * memory command
 509          */
 510         } else if (strncmp(argv[1], "me", 2) == 0) {
 511                 uint64_t addr, size;
 512                 int err;
 513                 addr = simple_strtoull(argv[2], NULL, 16);
 514                 size = simple_strtoull(argv[3], NULL, 16);
 515                 err = fdt_fixup_memory(working_fdt, addr, size);
 516                 if (err < 0)
 517                         return err;
 518
 519         /*
 520          * mem reserve commands
 521          */
 522         } else if (strncmp(argv[1], "rs", 2) == 0) {
 523                 if (argv[2][0] == 'p') {
 524                         uint64_t addr, size;
 525                         int total = fdt_num_mem_rsv(working_fdt);
 526                         int j, err;
 527                         printf("index\t\t   start\t\t    size\n");
 528                         printf("-------------------------------"
 529                                 "-----------------\n");
 530                         for (j = 0; j < total; j++) {
 531                                 err = fdt_get_mem_rsv(working_fdt, j, &addr, &size);
 532                                 if (err < 0) {
 533                                         printf("libfdt fdt_get_mem_rsv():  %s\n",
 534                                                         fdt_strerror(err));
 535                                         return err;
 536                                 }
 537                                 printf("    %x\t%08x%08x\t%08x%08x\n", j,
 538                                         (u32)(addr >> 32),
 539                                         (u32)(addr & 0xffffffff),
 540                                         (u32)(size >> 32),
 541                                         (u32)(size & 0xffffffff));
 542                         }
 543                 } else if (argv[2][0] == 'a') {
 544                         uint64_t addr, size;
 545                         int err;
 546                         addr = simple_strtoull(argv[3], NULL, 16);
 547                         size = simple_strtoull(argv[4], NULL, 16);
 548                         err = fdt_add_mem_rsv(working_fdt, addr, size);
 549
 550                         if (err < 0) {
 551                                 printf("libfdt fdt_add_mem_rsv():  %s\n",
 552                                         fdt_strerror(err));
 553                                 return err;
 554                         }
 555                 } else if (argv[2][0] == 'd') {
 556                         unsigned long idx = simple_strtoul(argv[3], NULL, 16);
 557                         int err = fdt_del_mem_rsv(working_fdt, idx);
 558
 559                         if (err < 0) {
 560                                 printf("libfdt fdt_del_mem_rsv():  %s\n",
 561                                         fdt_strerror(err));
 562                                 return err;
 563                         }
 564                 } else {
 565                         /* Unrecognized command */
 566                         return CMD_RET_USAGE;
 567                 }
 568         }
 569 #ifdef CONFIG_OF_BOARD_SETUP
 570         /* Call the board-specific fixup routine */
 571         else if (strncmp(argv[1], "boa", 3) == 0)
 572                 ft_board_setup(working_fdt, gd->bd);
 573 #endif
 574         /* Create a chosen node */
 575         else if (argv[1][0] == 'c') {
 576                 unsigned long initrd_start = 0, initrd_end = 0;
 577
 578                 if ((argc != 2) && (argc != 4))
 579                         return CMD_RET_USAGE;
 580
 581                 if (argc == 4) {
 582                         initrd_start = simple_strtoul(argv[2], NULL, 16);
 583                         initrd_end = simple_strtoul(argv[3], NULL, 16);
 584                 }
 585
 586                 fdt_chosen(working_fdt, 1);
 587                 fdt_initrd(working_fdt, initrd_start, initrd_end, 1);
 588         }
 589         /* resize the fdt */
 590         else if (strncmp(argv[1], "re", 2) == 0) {
 591                 fdt_resize(working_fdt);
 592         }
 593         else {
 594                 /* Unrecognized command */
 595                 return CMD_RET_USAGE;
 596         }
 597
 598         return 0;
 599 }
 600
 601 /****************************************************************************/
 602
 603 static int fdt_valid(void)
 604 {
 605         int  err;
 606
 607         if (working_fdt == NULL) {
 608                 printf ("The address of the fdt is invalid (NULL).\n");
 609                 return 0;
 610         }
 611
 612         err = fdt_check_header(working_fdt);
 613         if (err == 0)
 614                 return 1;       /* valid */
 615
 616         if (err < 0) {
 617                 printf("libfdt fdt_check_header(): %s", fdt_strerror(err));
 618                 /*
 619                  * Be more informative on bad version.
 620                  */
 621                 if (err == -FDT_ERR_BADVERSION) {
 622                         if (fdt_version(working_fdt) <
 623                             FDT_FIRST_SUPPORTED_VERSION) {
 624                                 printf (" - too old, fdt %d < %d",
 625                                         fdt_version(working_fdt),
 626                                         FDT_FIRST_SUPPORTED_VERSION);
 627                                 working_fdt = NULL;
 628                         }
 629                         if (fdt_last_comp_version(working_fdt) >
 630                             FDT_LAST_SUPPORTED_VERSION) {
 631                                 printf (" - too new, fdt %d > %d",
 632                                         fdt_version(working_fdt),
 633                                         FDT_LAST_SUPPORTED_VERSION);
 634                                 working_fdt = NULL;
 635                         }
 636                         return 0;
 637                 }
 638                 printf("\n");
 639                 return 0;
 640         }
 641         return 1;
 642 }
 643
 644 /****************************************************************************/
 645
 646 /*
 647  * Parse the user's input, partially heuristic.  Valid formats:
 648  * <0x00112233 4 05>    - an array of cells.  Numbers follow standard
 649  *                      C conventions.
 650  * [00 11 22 .. nn] - byte stream
 651  * "string"     - If the the value doesn't start with "<" or "[", it is
 652  *                      treated as a string.  Note that the quotes are
 653  *                      stripped by the parser before we get the string.
 654  * newval: An array of strings containing the new property as specified
 655  *      on the command line
 656  * count: The number of strings in the array
 657  * data: A bytestream to be placed in the property
 658  * len: The length of the resulting bytestream
 659  */
 660 static int fdt_parse_prop(char * const *newval, int count, char *data, int *len)
 661 {
 662         char *cp;               /* temporary char pointer */
 663         char *newp;             /* temporary newval char pointer */
 664         unsigned long tmp;      /* holds converted values */
 665         int stridx = 0;
 666
 667         *len = 0;
 668         newp = newval[0];
 669
 670         /* An array of cells */
 671         if (*newp == '<') {
 672                 newp++;
 673                 while ((*newp != '>') && (stridx < count)) {
 674                         /*
 675                          * Keep searching until we find that last ">"
 676                          * That way users don't have to escape the spaces
 677                          */
 678                         if (*newp == '\0') {
 679                                 newp = newval[++stridx];
 680                                 continue;
 681                         }
 682
 683                         cp = newp;
 684                         tmp = simple_strtoul(cp, &newp, 0);
 685                         *(__be32 *)data = __cpu_to_be32(tmp);
 686                         data  += 4;
 687                         *len += 4;
 688
 689                         /* If the ptr didn't advance, something went wrong */
 690                         if ((newp - cp) <= 0) {
 691                                 printf("Sorry, I could not convert \"%s\"\n",
 692                                         cp);
 693                                 return 1;
 694                         }
 695
 696                         while (*newp == ' ')
 697                                 newp++;
 698                 }
 699
 700                 if (*newp != '>') {
 701                         printf("Unexpected character '%c'\n", *newp);
 702                         return 1;
 703                 }
 704         } else if (*newp == '[') {
 705                 /*
 706                  * Byte stream.  Convert the values.
 707                  */
 708                 newp++;
 709                 while ((stridx < count) && (*newp != ']')) {
 710                         while (*newp == ' ')
 711                                 newp++;
 712                         if (*newp == '\0') {
 713                                 newp = newval[++stridx];
 714                                 continue;
 715                         }
 716                         if (!isxdigit(*newp))
 717                                 break;
 718                         tmp = simple_strtoul(newp, &newp, 16);
 719                         *data++ = tmp & 0xFF;
 720                         *len    = *len + 1;
 721                 }
 722                 if (*newp != ']') {
 723                         printf("Unexpected character '%c'\n", *newp);
 724                         return 1;
 725                 }
 726         } else {
 727                 /*
 728                  * Assume it is one or more strings.  Copy it into our
 729                  * data area for convenience (including the
 730                  * terminating '\0's).
 731                  */
 732                 while (stridx < count) {
 733                         size_t length = strlen(newp) + 1;
 734                         strcpy(data, newp);
 735                         data += length;
 736                         *len += length;
 737                         newp = newval[++stridx];
 738                 }
 739         }
 740         return 0;
 741 }
 742
 743 /****************************************************************************/
 744
 745 /*
 746  * Heuristic to guess if this is a string or concatenated strings.
 747  */
 748
 749 static int is_printable_string(const void *data, int len)
 750 {
 751         const char *s = data;
 752
 753         /* zero length is not */
 754         if (len == 0)
 755                 return 0;
 756
 757         /* must terminate with zero or '\n' */
 758         if (s[len - 1] != '\0' && s[len - 1] != '\n')
 759                 return 0;
 760
 761         /* printable or a null byte (concatenated strings) */
 762         while (((*s == '\0') || isprint(*s) || isspace(*s)) && (len > 0)) {
 763                 /*
 764                  * If we see a null, there are three possibilities:
 765                  * 1) If len == 1, it is the end of the string, printable
 766                  * 2) Next character also a null, not printable.
 767                  * 3) Next character not a null, continue to check.
 768                  */
 769                 if (s[0] == '\0') {
 770                         if (len == 1)
 771                                 return 1;
 772                         if (s[1] == '\0')
 773                                 return 0;
 774                 }
 775                 s++;
 776                 len--;
 777         }
 778
 779         /* Not the null termination, or not done yet: not printable */
 780         if (*s != '\0' || (len != 0))
 781                 return 0;
 782
 783         return 1;
 784 }
 785
 786
 787 /*
 788  * Print the property in the best format, a heuristic guess.  Print as
 789  * a string, concatenated strings, a byte, word, double word, or (if all
 790  * else fails) it is printed as a stream of bytes.
 791  */
 792 static void print_data(const void *data, int len)
 793 {
 794         int j;
 795
 796         /* no data, don't print */
 797         if (len == 0)
 798                 return;
 799
 800         /*
 801          * It is a string, but it may have multiple strings (embedded '\0's).
 802          */
 803         if (is_printable_string(data, len)) {
 804                 puts("\"");
 805                 j = 0;
 806                 while (j < len) {
 807                         if (j > 0)
 808                                 puts("\", \"");
 809                         puts(data);
 810                         j    += strlen(data) + 1;
 811                         data += strlen(data) + 1;
 812                 }
 813                 puts("\"");
 814                 return;
 815         }
 816
 817         if ((len %4) == 0) {
 818                 if (len > CONFIG_CMD_FDT_MAX_DUMP)
 819                         printf("* 0x%p [0x%08x]", data, len);
 820                 else {
 821                         const __be32 *p;
 822
 823                         printf("<");
 824                         for (j = 0, p = data; j < len/4; j++)
 825                                 printf("0x%08x%s", fdt32_to_cpu(p[j]),
 826                                         j < (len/4 - 1) ? " " : "");
 827                         printf(">");
 828                 }
 829         } else { /* anything else... hexdump */
 830                 if (len > CONFIG_CMD_FDT_MAX_DUMP)
 831                         printf("* 0x%p [0x%08x]", data, len);
 832                 else {
 833                         const u8 *s;
 834
 835                         printf("[");
 836                         for (j = 0, s = data; j < len; j++)
 837                                 printf("%02x%s", s[j], j < len - 1 ? " " : "");
 838                         printf("]");
 839                 }
 840         }
 841 }
 842
 843 /****************************************************************************/
 844
 845 /*
 846  * Recursively print (a portion of) the working_fdt.  The depth parameter
 847  * determines how deeply nested the fdt is printed.
 848  */
 849 static int fdt_print(const char *pathp, char *prop, int depth)
 850 {
 851         static char tabs[MAX_LEVEL+1] =
 852                 "\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t"
 853                 "\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t";
 854         const void *nodep;      /* property node pointer */
 855         int  nodeoffset;        /* node offset from libfdt */
 856         int  nextoffset;        /* next node offset from libfdt */
 857         uint32_t tag;           /* tag */
 858         int  len;               /* length of the property */
 859         int  level = 0;         /* keep track of nesting level */
 860         const struct fdt_property *fdt_prop;
 861
 862         nodeoffset = fdt_path_offset (working_fdt, pathp);
 863         if (nodeoffset < 0) {
 864                 /*
 865                  * Not found or something else bad happened.
 866                  */
 867                 printf ("libfdt fdt_path_offset() returned %s\n",
 868                         fdt_strerror(nodeoffset));
 869                 return 1;
 870         }
 871         /*
 872          * The user passed in a property as well as node path.
 873          * Print only the given property and then return.
 874          */
 875         if (prop) {
 876                 nodep = fdt_getprop (working_fdt, nodeoffset, prop, &len);
 877                 if (len == 0) {
 878                         /* no property value */
 879                         printf("%s %s\n", pathp, prop);
 880                         return 0;
 881                 } else if (len > 0) {
 882                         printf("%s = ", prop);
 883                         print_data (nodep, len);
 884                         printf("\n");
 885                         return 0;
 886                 } else {
 887                         printf ("libfdt fdt_getprop(): %s\n",
 888                                 fdt_strerror(len));
 889                         return 1;
 890                 }
 891         }
 892
 893         /*
 894          * The user passed in a node path and no property,
 895          * print the node and all subnodes.
 896          */
 897         while(level >= 0) {
 898                 tag = fdt_next_tag(working_fdt, nodeoffset, &nextoffset);
 899                 switch(tag) {
 900                 case FDT_BEGIN_NODE:
 901                         pathp = fdt_get_name(working_fdt, nodeoffset, NULL);
 902                         if (level <= depth) {
 903                                 if (pathp == NULL)
 904                                         pathp = "/* NULL pointer error */";
 905                                 if (*pathp == '\0')
 906                                         pathp = "/";    /* root is nameless */
 907                                 printf("%s%s {\n",
 908                                         &tabs[MAX_LEVEL - level], pathp);
 909                         }
 910                         level++;
 911                         if (level >= MAX_LEVEL) {
 912                                 printf("Nested too deep, aborting.\n");
 913                                 return 1;
 914                         }
 915                         break;
 916                 case FDT_END_NODE:
 917                         level--;
 918                         if (level <= depth)
 919                                 printf("%s};\n", &tabs[MAX_LEVEL - level]);
 920                         if (level == 0) {
 921                                 level = -1;             /* exit the loop */
 922                         }
 923                         break;
 924                 case FDT_PROP:
 925                         fdt_prop = fdt_offset_ptr(working_fdt, nodeoffset,
 926                                         sizeof(*fdt_prop));
 927                         pathp    = fdt_string(working_fdt,
 928                                         fdt32_to_cpu(fdt_prop->nameoff));
 929                         len      = fdt32_to_cpu(fdt_prop->len);
 930                         nodep    = fdt_prop->data;
 931                         if (len < 0) {
 932                                 printf ("libfdt fdt_getprop(): %s\n",
 933                                         fdt_strerror(len));
 934                                 return 1;
 935                         } else if (len == 0) {
 936                                 /* the property has no value */
 937                                 if (level <= depth)
 938                                         printf("%s%s;\n",
 939                                                 &tabs[MAX_LEVEL - level],
 940                                                 pathp);
 941                         } else {
 942                                 if (level <= depth) {
 943                                         printf("%s%s = ",
 944                                                 &tabs[MAX_LEVEL - level],
 945                                                 pathp);
 946                                         print_data (nodep, len);
 947                                         printf(";\n");
 948                                 }
 949                         }
 950                         break;
 951                 case FDT_NOP:
 952                         printf("%s/* NOP */\n", &tabs[MAX_LEVEL - level]);
 953                         break;
 954                 case FDT_END:
 955                         return 1;
 956                 default:
 957                         if (level <= depth)
 958                                 printf("Unknown tag 0x%08X\n", tag);
 959                         return 1;
 960                 }
 961                 nodeoffset = nextoffset;
 962         }
 963         return 0;
 964 }
 965
 966 /********************************************************************/
 967 #ifdef CONFIG_SYS_LONGHELP
 968 static char fdt_help_text[] =
 969         "addr   <addr> [<length>]        - Set the fdt location to <addr>\n"
 970 #ifdef CONFIG_OF_BOARD_SETUP
 971         "fdt boardsetup                      - Do board-specific set up\n"
 972 #endif
 973         "fdt move   <fdt> <newaddr> <length> - Copy the fdt to <addr> and make it active\n"
 974         "fdt resize                          - Resize fdt to size + padding to 4k addr\n"
 975         "fdt print  <path> [<prop>]          - Recursive print starting at <path>\n"
 976         "fdt list   <path> [<prop>]          - Print one level starting at <path>\n"
 977         "fdt get value <var> <path> <prop>   - Get <property> and store in <var>\n"
 978         "fdt get name <var> <path> <index>   - Get name of node <index> and store in <var>\n"
 979         "fdt get addr <var> <path> <prop>    - Get start address of <property> and store in <var>\n"
 980         "fdt get size <var> <path> [<prop>]  - Get size of [<property>] or num nodes and store in <var>\n"
 981         "fdt set    <path> <prop> [<val>]    - Set <property> [to <val>]\n"
 982         "fdt mknode <path> <node>            - Create a new node after <path>\n"
 983         "fdt rm     <path> [<prop>]          - Delete the node or <property>\n"
 984         "fdt header                          - Display header info\n"
 985         "fdt bootcpu <id>                    - Set boot cpuid\n"
 986         "fdt memory <addr> <size>            - Add/Update memory node\n"
 987         "fdt rsvmem print                    - Show current mem reserves\n"
 988         "fdt rsvmem add <addr> <size>        - Add a mem reserve\n"
 989         "fdt rsvmem delete <index>           - Delete a mem reserves\n"
 990         "fdt chosen [<start> <end>]          - Add/update the /chosen branch in the tree\n"
 991         "                                        <start>/<end> - initrd start/end addr\n"
 992         "NOTE: Dereference aliases by omiting the leading '/', "
 993                 "e.g. fdt print ethernet0.";
 994 #endif
 995
 996 U_BOOT_CMD(
 997         fdt,    255,    0,      do_fdt,
 998         "flattened device tree utility commands", fdt_help_text
 999 );