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  * SPDX-License-Identifier:     GPL-2.0+
   9  */
  10
  11 #include <common.h>
  12 #include <command.h>
  13 #include <linux/ctype.h>
  14 #include <linux/types.h>
  15 #include <asm/global_data.h>
  16 #include <libfdt.h>
  17 #include <fdt_support.h>
  18 #include <asm/io.h>
  19
  20 #define MAX_LEVEL       32              /* how deeply nested we will go */
  21 #define SCRATCHPAD      1024            /* bytes of scratchpad memory */
  22 #ifndef CONFIG_CMD_FDT_MAX_DUMP
  23 #define CONFIG_CMD_FDT_MAX_DUMP 64
  24 #endif
  25
  26 /*
  27  * Global data (for the gd->bd)
  28  */
  29 DECLARE_GLOBAL_DATA_PTR;
  30
  31 static int fdt_valid(struct fdt_header **blobp);
  32 static int fdt_parse_prop(char *const*newval, int count, char *data, int *len);
  33 static int fdt_print(const char *pathp, char *prop, int depth);
  34 static int is_printable_string(const void *data, int len);
  35
  36 /*
  37  * The working_fdt points to our working flattened device tree.
  38  */
  39 struct fdt_header *working_fdt;
  40
  41 void set_working_fdt_addr(ulong addr)
  42 {
  43         void *buf;
  44
  45         buf = map_sysmem(addr, 0);
  46         working_fdt = buf;
  47         setenv_ulong("fdtaddr", addr);
  48 }
  49
  50 /*
  51  * Get a value from the fdt and format it to be set in the environment
  52  */
  53 static int fdt_value_setenv(const void *nodep, int len, const char *var)
  54 {
  55         if (is_printable_string(nodep, len))
  56                 setenv(var, (void *)nodep);
  57         else if (len == 4) {
  58                 char buf[11];
  59
  60                 sprintf(buf, "0x%08X", *(uint32_t *)nodep);
  61                 setenv(var, buf);
  62         } else if (len%4 == 0 && len <= 20) {
  63                 /* Needed to print things like sha1 hashes. */
  64                 char buf[41];
  65                 int i;
  66
  67                 for (i = 0; i < len; i += sizeof(unsigned int))
  68                         sprintf(buf + (i * 2), "%08x",
  69                                 *(unsigned int *)(nodep + i));
  70                 setenv(var, buf);
  71         } else {
  72                 printf("error: unprintable value\n");
  73                 return 1;
  74         }
  75         return 0;
  76 }
  77
  78 /*
  79  * Flattened Device Tree command, see the help for parameter definitions.
  80  */
  81 static int do_fdt(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
  82 {
  83         if (argc < 2)
  84                 return CMD_RET_USAGE;
  85
  86         /*
  87          * Set the address of the fdt
  88          */
  89         if (argv[1][0] == 'a') {
  90                 unsigned long addr;
  91                 int control = 0;
  92                 struct fdt_header *blob;
  93                 /*
  94                  * Set the address [and length] of the fdt.
  95                  */
  96                 argc -= 2;
  97                 argv += 2;
  98 /* Temporary #ifdef - some archs don't have fdt_blob yet */
  99 #ifdef CONFIG_OF_CONTROL
 100                 if (argc && !strcmp(*argv, "-c")) {
 101                         control = 1;
 102                         argc--;
 103                         argv++;
 104                 }
 105 #endif
 106                 if (argc == 0) {
 107                         if (control)
 108                                 blob = (struct fdt_header *)gd->fdt_blob;
 109                         else
 110                                 blob = working_fdt;
 111                         if (!blob || !fdt_valid(&blob))
 112                                 return 1;
 113                         printf("The address of the fdt is %#08lx\n",
 114                                control ? (ulong)map_to_sysmem(blob) :
 115                                         getenv_hex("fdtaddr", 0));
 116                         return 0;
 117                 }
 118
 119                 addr = simple_strtoul(argv[0], NULL, 16);
 120                 blob = map_sysmem(addr, 0);
 121                 if (!fdt_valid(&blob))
 122                         return 1;
 123                 if (control)
 124                         gd->fdt_blob = blob;
 125                 else
 126                         set_working_fdt_addr(addr);
 127
 128                 if (argc >= 2) {
 129                         int  len;
 130                         int  err;
 131                         /*
 132                          * Optional new length
 133                          */
 134                         len = simple_strtoul(argv[1], NULL, 16);
 135                         if (len < fdt_totalsize(blob)) {
 136                                 printf ("New length %d < existing length %d, "
 137                                         "ignoring.\n",
 138                                         len, fdt_totalsize(blob));
 139                         } else {
 140                                 /*
 141                                  * Open in place with a new length.
 142                                  */
 143                                 err = fdt_open_into(blob, blob, len);
 144                                 if (err != 0) {
 145                                         printf ("libfdt fdt_open_into(): %s\n",
 146                                                 fdt_strerror(err));
 147                                 }
 148                         }
 149                 }
 150
 151                 return CMD_RET_SUCCESS;
 152         }
 153
 154         if (!working_fdt) {
 155                 puts(
 156                         "No FDT memory address configured. Please configure\n"
 157                         "the FDT address via \"fdt addr <address>\" command.\n"
 158                         "Aborting!\n");
 159                 return CMD_RET_FAILURE;
 160         }
 161
 162         /*
 163          * Move the working_fdt
 164          */
 165         if (strncmp(argv[1], "mo", 2) == 0) {
 166                 struct fdt_header *newaddr;
 167                 int  len;
 168                 int  err;
 169
 170                 if (argc < 4)
 171                         return CMD_RET_USAGE;
 172
 173                 /*
 174                  * Set the address and length of the fdt.
 175                  */
 176                 working_fdt = (struct fdt_header *)simple_strtoul(argv[2], NULL, 16);
 177                 if (!fdt_valid(&working_fdt))
 178                         return 1;
 179
 180                 newaddr = (struct fdt_header *)simple_strtoul(argv[3],NULL,16);
 181
 182                 /*
 183                  * If the user specifies a length, use that.  Otherwise use the
 184                  * current length.
 185                  */
 186                 if (argc <= 4) {
 187                         len = fdt_totalsize(working_fdt);
 188                 } else {
 189                         len = simple_strtoul(argv[4], NULL, 16);
 190                         if (len < fdt_totalsize(working_fdt)) {
 191                                 printf ("New length 0x%X < existing length "
 192                                         "0x%X, aborting.\n",
 193                                         len, fdt_totalsize(working_fdt));
 194                                 return 1;
 195                         }
 196                 }
 197
 198                 /*
 199                  * Copy to the new location.
 200                  */
 201                 err = fdt_open_into(working_fdt, newaddr, len);
 202                 if (err != 0) {
 203                         printf ("libfdt fdt_open_into(): %s\n",
 204                                 fdt_strerror(err));
 205                         return 1;
 206                 }
 207                 working_fdt = newaddr;
 208
 209         /*
 210          * Make a new node
 211          */
 212         } else if (strncmp(argv[1], "mk", 2) == 0) {
 213                 char *pathp;            /* path */
 214                 char *nodep;            /* new node to add */
 215                 int  nodeoffset;        /* node offset from libfdt */
 216                 int  err;
 217
 218                 /*
 219                  * Parameters: Node path, new node to be appended to the path.
 220                  */
 221                 if (argc < 4)
 222                         return CMD_RET_USAGE;
 223
 224                 pathp = argv[2];
 225                 nodep = argv[3];
 226
 227                 nodeoffset = fdt_path_offset (working_fdt, pathp);
 228                 if (nodeoffset < 0) {
 229                         /*
 230                          * Not found or something else bad happened.
 231                          */
 232                         printf ("libfdt fdt_path_offset() returned %s\n",
 233                                 fdt_strerror(nodeoffset));
 234                         return 1;
 235                 }
 236                 err = fdt_add_subnode(working_fdt, nodeoffset, nodep);
 237                 if (err < 0) {
 238                         printf ("libfdt fdt_add_subnode(): %s\n",
 239                                 fdt_strerror(err));
 240                         return 1;
 241                 }
 242
 243         /*
 244          * Set the value of a property in the working_fdt.
 245          */
 246         } else if (argv[1][0] == 's') {
 247                 char *pathp;            /* path */
 248                 char *prop;             /* property */
 249                 int  nodeoffset;        /* node offset from libfdt */
 250                 static char data[SCRATCHPAD];   /* storage for the property */
 251                 int  len;               /* new length of the property */
 252                 int  ret;               /* return value */
 253
 254                 /*
 255                  * Parameters: Node path, property, optional value.
 256                  */
 257                 if (argc < 4)
 258                         return CMD_RET_USAGE;
 259
 260                 pathp  = argv[2];
 261                 prop   = argv[3];
 262                 if (argc == 4) {
 263                         len = 0;
 264                 } else {
 265                         ret = fdt_parse_prop(&argv[4], argc - 4, data, &len);
 266                         if (ret != 0)
 267                                 return ret;
 268                 }
 269
 270                 nodeoffset = fdt_path_offset (working_fdt, pathp);
 271                 if (nodeoffset < 0) {
 272                         /*
 273                          * Not found or something else bad happened.
 274                          */
 275                         printf ("libfdt fdt_path_offset() returned %s\n",
 276                                 fdt_strerror(nodeoffset));
 277                         return 1;
 278                 }
 279
 280                 ret = fdt_setprop(working_fdt, nodeoffset, prop, data, len);
 281                 if (ret < 0) {
 282                         printf ("libfdt fdt_setprop(): %s\n", fdt_strerror(ret));
 283                         return 1;
 284                 }
 285
 286         /********************************************************************
 287          * Get the value of a property in the working_fdt.
 288          ********************************************************************/
 289         } else if (argv[1][0] == 'g') {
 290                 char *subcmd;           /* sub-command */
 291                 char *pathp;            /* path */
 292                 char *prop;             /* property */
 293                 char *var;              /* variable to store result */
 294                 int  nodeoffset;        /* node offset from libfdt */
 295                 const void *nodep;      /* property node pointer */
 296                 int  len = 0;           /* new length of the property */
 297
 298                 /*
 299                  * Parameters: Node path, property, optional value.
 300                  */
 301                 if (argc < 5)
 302                         return CMD_RET_USAGE;
 303
 304                 subcmd = argv[2];
 305
 306                 if (argc < 6 && subcmd[0] != 's')
 307                         return CMD_RET_USAGE;
 308
 309                 var    = argv[3];
 310                 pathp  = argv[4];
 311                 prop   = argv[5];
 312
 313                 nodeoffset = fdt_path_offset(working_fdt, pathp);
 314                 if (nodeoffset < 0) {
 315                         /*
 316                          * Not found or something else bad happened.
 317                          */
 318                         printf("libfdt fdt_path_offset() returned %s\n",
 319                                 fdt_strerror(nodeoffset));
 320                         return 1;
 321                 }
 322
 323                 if (subcmd[0] == 'n' || (subcmd[0] == 's' && argc == 5)) {
 324                         int reqIndex = -1;
 325                         int startDepth = fdt_node_depth(
 326                                 working_fdt, nodeoffset);
 327                         int curDepth = startDepth;
 328                         int curIndex = -1;
 329                         int nextNodeOffset = fdt_next_node(
 330                                 working_fdt, nodeoffset, &curDepth);
 331
 332                         if (subcmd[0] == 'n')
 333                                 reqIndex = simple_strtoul(argv[5], NULL, 16);
 334
 335                         while (curDepth > startDepth) {
 336                                 if (curDepth == startDepth + 1)
 337                                         curIndex++;
 338                                 if (subcmd[0] == 'n' && curIndex == reqIndex) {
 339                                         const char *nodeName = fdt_get_name(
 340                                             working_fdt, nextNodeOffset, NULL);
 341
 342                                         setenv(var, (char *)nodeName);
 343                                         return 0;
 344                                 }
 345                                 nextNodeOffset = fdt_next_node(
 346                                         working_fdt, nextNodeOffset, &curDepth);
 347                                 if (nextNodeOffset < 0)
 348                                         break;
 349                         }
 350                         if (subcmd[0] == 's') {
 351                                 /* get the num nodes at this level */
 352                                 setenv_ulong(var, curIndex + 1);
 353                         } else {
 354                                 /* node index not found */
 355                                 printf("libfdt node not found\n");
 356                                 return 1;
 357                         }
 358                 } else {
 359                         nodep = fdt_getprop(
 360                                 working_fdt, nodeoffset, prop, &len);
 361                         if (len == 0) {
 362                                 /* no property value */
 363                                 setenv(var, "");
 364                                 return 0;
 365                         } else if (len > 0) {
 366                                 if (subcmd[0] == 'v') {
 367                                         int ret;
 368
 369                                         ret = fdt_value_setenv(nodep, len, var);
 370                                         if (ret != 0)
 371                                                 return ret;
 372                                 } else if (subcmd[0] == 'a') {
 373                                         /* Get address */
 374                                         char buf[11];
 375
 376                                         sprintf(buf, "0x%p", nodep);
 377                                         setenv(var, buf);
 378                                 } else if (subcmd[0] == 's') {
 379                                         /* Get size */
 380                                         char buf[11];
 381
 382                                         sprintf(buf, "0x%08X", len);
 383                                         setenv(var, buf);
 384                                 } else
 385                                         return CMD_RET_USAGE;
 386                                 return 0;
 387                         } else {
 388                                 printf("libfdt fdt_getprop(): %s\n",
 389                                         fdt_strerror(len));
 390                                 return 1;
 391                         }
 392                 }
 393
 394         /*
 395          * Print (recursive) / List (single level)
 396          */
 397         } else if ((argv[1][0] == 'p') || (argv[1][0] == 'l')) {
 398                 int depth = MAX_LEVEL;  /* how deep to print */
 399                 char *pathp;            /* path */
 400                 char *prop;             /* property */
 401                 int  ret;               /* return value */
 402                 static char root[2] = "/";
 403
 404                 /*
 405                  * list is an alias for print, but limited to 1 level
 406                  */
 407                 if (argv[1][0] == 'l') {
 408                         depth = 1;
 409                 }
 410
 411                 /*
 412                  * Get the starting path.  The root node is an oddball,
 413                  * the offset is zero and has no name.
 414                  */
 415                 if (argc == 2)
 416                         pathp = root;
 417                 else
 418                         pathp = argv[2];
 419                 if (argc > 3)
 420                         prop = argv[3];
 421                 else
 422                         prop = NULL;
 423
 424                 ret = fdt_print(pathp, prop, depth);
 425                 if (ret != 0)
 426                         return ret;
 427
 428         /*
 429          * Remove a property/node
 430          */
 431         } else if (strncmp(argv[1], "rm", 2) == 0) {
 432                 int  nodeoffset;        /* node offset from libfdt */
 433                 int  err;
 434
 435                 /*
 436                  * Get the path.  The root node is an oddball, the offset
 437                  * is zero and has no name.
 438                  */
 439                 nodeoffset = fdt_path_offset (working_fdt, argv[2]);
 440                 if (nodeoffset < 0) {
 441                         /*
 442                          * Not found or something else bad happened.
 443                          */
 444                         printf ("libfdt fdt_path_offset() returned %s\n",
 445                                 fdt_strerror(nodeoffset));
 446                         return 1;
 447                 }
 448                 /*
 449                  * Do the delete.  A fourth parameter means delete a property,
 450                  * otherwise delete the node.
 451                  */
 452                 if (argc > 3) {
 453                         err = fdt_delprop(working_fdt, nodeoffset, argv[3]);
 454                         if (err < 0) {
 455                                 printf("libfdt fdt_delprop():  %s\n",
 456                                         fdt_strerror(err));
 457                                 return err;
 458                         }
 459                 } else {
 460                         err = fdt_del_node(working_fdt, nodeoffset);
 461                         if (err < 0) {
 462                                 printf("libfdt fdt_del_node():  %s\n",
 463                                         fdt_strerror(err));
 464                                 return err;
 465                         }
 466                 }
 467
 468         /*
 469          * Display header info
 470          */
 471         } else if (argv[1][0] == 'h') {
 472                 u32 version = fdt_version(working_fdt);
 473                 printf("magic:\t\t\t0x%x\n", fdt_magic(working_fdt));
 474                 printf("totalsize:\t\t0x%x (%d)\n", fdt_totalsize(working_fdt),
 475                        fdt_totalsize(working_fdt));
 476                 printf("off_dt_struct:\t\t0x%x\n",
 477                        fdt_off_dt_struct(working_fdt));
 478                 printf("off_dt_strings:\t\t0x%x\n",
 479                        fdt_off_dt_strings(working_fdt));
 480                 printf("off_mem_rsvmap:\t\t0x%x\n",
 481                        fdt_off_mem_rsvmap(working_fdt));
 482                 printf("version:\t\t%d\n", version);
 483                 printf("last_comp_version:\t%d\n",
 484                        fdt_last_comp_version(working_fdt));
 485                 if (version >= 2)
 486                         printf("boot_cpuid_phys:\t0x%x\n",
 487                                 fdt_boot_cpuid_phys(working_fdt));
 488                 if (version >= 3)
 489                         printf("size_dt_strings:\t0x%x\n",
 490                                 fdt_size_dt_strings(working_fdt));
 491                 if (version >= 17)
 492                         printf("size_dt_struct:\t\t0x%x\n",
 493                                 fdt_size_dt_struct(working_fdt));
 494                 printf("number mem_rsv:\t\t0x%x\n",
 495                        fdt_num_mem_rsv(working_fdt));
 496                 printf("\n");
 497
 498         /*
 499          * Set boot cpu id
 500          */
 501         } else if (strncmp(argv[1], "boo", 3) == 0) {
 502                 unsigned long tmp = simple_strtoul(argv[2], NULL, 16);
 503                 fdt_set_boot_cpuid_phys(working_fdt, tmp);
 504
 505         /*
 506          * memory command
 507          */
 508         } else if (strncmp(argv[1], "me", 2) == 0) {
 509                 uint64_t addr, size;
 510                 int err;
 511                 addr = simple_strtoull(argv[2], NULL, 16);
 512                 size = simple_strtoull(argv[3], NULL, 16);
 513                 err = fdt_fixup_memory(working_fdt, addr, size);
 514                 if (err < 0)
 515                         return err;
 516
 517         /*
 518          * mem reserve commands
 519          */
 520         } else if (strncmp(argv[1], "rs", 2) == 0) {
 521                 if (argv[2][0] == 'p') {
 522                         uint64_t addr, size;
 523                         int total = fdt_num_mem_rsv(working_fdt);
 524                         int j, err;
 525                         printf("index\t\t   start\t\t    size\n");
 526                         printf("-------------------------------"
 527                                 "-----------------\n");
 528                         for (j = 0; j < total; j++) {
 529                                 err = fdt_get_mem_rsv(working_fdt, j, &addr, &size);
 530                                 if (err < 0) {
 531                                         printf("libfdt fdt_get_mem_rsv():  %s\n",
 532                                                         fdt_strerror(err));
 533                                         return err;
 534                                 }
 535                                 printf("    %x\t%08x%08x\t%08x%08x\n", j,
 536                                         (u32)(addr >> 32),
 537                                         (u32)(addr & 0xffffffff),
 538                                         (u32)(size >> 32),
 539                                         (u32)(size & 0xffffffff));
 540                         }
 541                 } else if (argv[2][0] == 'a') {
 542                         uint64_t addr, size;
 543                         int err;
 544                         addr = simple_strtoull(argv[3], NULL, 16);
 545                         size = simple_strtoull(argv[4], NULL, 16);
 546                         err = fdt_add_mem_rsv(working_fdt, addr, size);
 547
 548                         if (err < 0) {
 549                                 printf("libfdt fdt_add_mem_rsv():  %s\n",
 550                                         fdt_strerror(err));
 551                                 return err;
 552                         }
 553                 } else if (argv[2][0] == 'd') {
 554                         unsigned long idx = simple_strtoul(argv[3], NULL, 16);
 555                         int err = fdt_del_mem_rsv(working_fdt, idx);
 556
 557                         if (err < 0) {
 558                                 printf("libfdt fdt_del_mem_rsv():  %s\n",
 559                                         fdt_strerror(err));
 560                                 return err;
 561                         }
 562                 } else {
 563                         /* Unrecognized command */
 564                         return CMD_RET_USAGE;
 565                 }
 566         }
 567 #ifdef CONFIG_OF_BOARD_SETUP
 568         /* Call the board-specific fixup routine */
 569         else if (strncmp(argv[1], "boa", 3) == 0) {
 570                 int err = ft_board_setup(working_fdt, gd->bd);
 571
 572                 if (err) {
 573                         printf("Failed to update board information in FDT: %s\n",
 574                                fdt_strerror(err));
 575                         return CMD_RET_FAILURE;
 576                 }
 577         }
 578 #endif
 579 #ifdef CONFIG_OF_SYSTEM_SETUP
 580         /* Call the board-specific fixup routine */
 581         else if (strncmp(argv[1], "sys", 3) == 0) {
 582                 int err = ft_system_setup(working_fdt, gd->bd);
 583
 584                 if (err) {
 585                         printf("Failed to add system information to FDT: %s\n",
 586                                fdt_strerror(err));
 587                         return CMD_RET_FAILURE;
 588                 }
 589         }
 590 #endif
 591         /* Create a chosen node */
 592         else if (strncmp(argv[1], "cho", 3) == 0) {
 593                 unsigned long initrd_start = 0, initrd_end = 0;
 594
 595                 if ((argc != 2) && (argc != 4))
 596                         return CMD_RET_USAGE;
 597
 598                 if (argc == 4) {
 599                         initrd_start = simple_strtoul(argv[2], NULL, 16);
 600                         initrd_end = simple_strtoul(argv[3], NULL, 16);
 601                 }
 602
 603                 fdt_chosen(working_fdt);
 604                 fdt_initrd(working_fdt, initrd_start, initrd_end);
 605
 606 #if defined(CONFIG_FIT_SIGNATURE)
 607         } else if (strncmp(argv[1], "che", 3) == 0) {
 608                 int cfg_noffset;
 609                 int ret;
 610                 unsigned long addr;
 611                 struct fdt_header *blob;
 612
 613                 if (!working_fdt)
 614                         return CMD_RET_FAILURE;
 615
 616                 if (argc > 2) {
 617                         addr = simple_strtoul(argv[2], NULL, 16);
 618                         blob = map_sysmem(addr, 0);
 619                 } else {
 620                         blob = (struct fdt_header *)gd->fdt_blob;
 621                 }
 622                 if (!fdt_valid(&blob))
 623                         return 1;
 624
 625                 gd->fdt_blob = blob;
 626                 cfg_noffset = fit_conf_get_node(working_fdt, NULL);
 627                 if (!cfg_noffset) {
 628                         printf("Could not find configuration node: %s\n",
 629                                fdt_strerror(cfg_noffset));
 630                         return CMD_RET_FAILURE;
 631                 }
 632
 633                 ret = fit_config_verify(working_fdt, cfg_noffset);
 634                 if (ret == 0)
 635                         return CMD_RET_SUCCESS;
 636                 else
 637                         return CMD_RET_FAILURE;
 638 #endif
 639
 640         }
 641         /* resize the fdt */
 642         else if (strncmp(argv[1], "re", 2) == 0) {
 643                 fdt_shrink_to_minimum(working_fdt);
 644         }
 645         else {
 646                 /* Unrecognized command */
 647                 return CMD_RET_USAGE;
 648         }
 649
 650         return 0;
 651 }
 652
 653 /****************************************************************************/
 654
 655 /**
 656  * fdt_valid() - Check if an FDT is valid. If not, change it to NULL
 657  *
 658  * @blobp: Pointer to FDT pointer
 659  * @return 1 if OK, 0 if bad (in which case *blobp is set to NULL)
 660  */
 661 static int fdt_valid(struct fdt_header **blobp)
 662 {
 663         const void *blob = *blobp;
 664         int err;
 665
 666         if (blob == NULL) {
 667                 printf ("The address of the fdt is invalid (NULL).\n");
 668                 return 0;
 669         }
 670
 671         err = fdt_check_header(blob);
 672         if (err == 0)
 673                 return 1;       /* valid */
 674
 675         if (err < 0) {
 676                 printf("libfdt fdt_check_header(): %s", fdt_strerror(err));
 677                 /*
 678                  * Be more informative on bad version.
 679                  */
 680                 if (err == -FDT_ERR_BADVERSION) {
 681                         if (fdt_version(blob) <
 682                             FDT_FIRST_SUPPORTED_VERSION) {
 683                                 printf (" - too old, fdt %d < %d",
 684                                         fdt_version(blob),
 685                                         FDT_FIRST_SUPPORTED_VERSION);
 686                         }
 687                         if (fdt_last_comp_version(blob) >
 688                             FDT_LAST_SUPPORTED_VERSION) {
 689                                 printf (" - too new, fdt %d > %d",
 690                                         fdt_version(blob),
 691                                         FDT_LAST_SUPPORTED_VERSION);
 692                         }
 693                 }
 694                 printf("\n");
 695                 *blobp = NULL;
 696                 return 0;
 697         }
 698         return 1;
 699 }
 700
 701 /****************************************************************************/
 702
 703 /*
 704  * Parse the user's input, partially heuristic.  Valid formats:
 705  * <0x00112233 4 05>    - an array of cells.  Numbers follow standard
 706  *                      C conventions.
 707  * [00 11 22 .. nn] - byte stream
 708  * "string"     - If the the value doesn't start with "<" or "[", it is
 709  *                      treated as a string.  Note that the quotes are
 710  *                      stripped by the parser before we get the string.
 711  * newval: An array of strings containing the new property as specified
 712  *      on the command line
 713  * count: The number of strings in the array
 714  * data: A bytestream to be placed in the property
 715  * len: The length of the resulting bytestream
 716  */
 717 static int fdt_parse_prop(char * const *newval, int count, char *data, int *len)
 718 {
 719         char *cp;               /* temporary char pointer */
 720         char *newp;             /* temporary newval char pointer */
 721         unsigned long tmp;      /* holds converted values */
 722         int stridx = 0;
 723
 724         *len = 0;
 725         newp = newval[0];
 726
 727         /* An array of cells */
 728         if (*newp == '<') {
 729                 newp++;
 730                 while ((*newp != '>') && (stridx < count)) {
 731                         /*
 732                          * Keep searching until we find that last ">"
 733                          * That way users don't have to escape the spaces
 734                          */
 735                         if (*newp == '\0') {
 736                                 newp = newval[++stridx];
 737                                 continue;
 738                         }
 739
 740                         cp = newp;
 741                         tmp = simple_strtoul(cp, &newp, 0);
 742                         *(__be32 *)data = __cpu_to_be32(tmp);
 743                         data  += 4;
 744                         *len += 4;
 745
 746                         /* If the ptr didn't advance, something went wrong */
 747                         if ((newp - cp) <= 0) {
 748                                 printf("Sorry, I could not convert \"%s\"\n",
 749                                         cp);
 750                                 return 1;
 751                         }
 752
 753                         while (*newp == ' ')
 754                                 newp++;
 755                 }
 756
 757                 if (*newp != '>') {
 758                         printf("Unexpected character '%c'\n", *newp);
 759                         return 1;
 760                 }
 761         } else if (*newp == '[') {
 762                 /*
 763                  * Byte stream.  Convert the values.
 764                  */
 765                 newp++;
 766                 while ((stridx < count) && (*newp != ']')) {
 767                         while (*newp == ' ')
 768                                 newp++;
 769                         if (*newp == '\0') {
 770                                 newp = newval[++stridx];
 771                                 continue;
 772                         }
 773                         if (!isxdigit(*newp))
 774                                 break;
 775                         tmp = simple_strtoul(newp, &newp, 16);
 776                         *data++ = tmp & 0xFF;
 777                         *len    = *len + 1;
 778                 }
 779                 if (*newp != ']') {
 780                         printf("Unexpected character '%c'\n", *newp);
 781                         return 1;
 782                 }
 783         } else {
 784                 /*
 785                  * Assume it is one or more strings.  Copy it into our
 786                  * data area for convenience (including the
 787                  * terminating '\0's).
 788                  */
 789                 while (stridx < count) {
 790                         size_t length = strlen(newp) + 1;
 791                         strcpy(data, newp);
 792                         data += length;
 793                         *len += length;
 794                         newp = newval[++stridx];
 795                 }
 796         }
 797         return 0;
 798 }
 799
 800 /****************************************************************************/
 801
 802 /*
 803  * Heuristic to guess if this is a string or concatenated strings.
 804  */
 805
 806 static int is_printable_string(const void *data, int len)
 807 {
 808         const char *s = data;
 809
 810         /* zero length is not */
 811         if (len == 0)
 812                 return 0;
 813
 814         /* must terminate with zero or '\n' */
 815         if (s[len - 1] != '\0' && s[len - 1] != '\n')
 816                 return 0;
 817
 818         /* printable or a null byte (concatenated strings) */
 819         while (((*s == '\0') || isprint(*s) || isspace(*s)) && (len > 0)) {
 820                 /*
 821                  * If we see a null, there are three possibilities:
 822                  * 1) If len == 1, it is the end of the string, printable
 823                  * 2) Next character also a null, not printable.
 824                  * 3) Next character not a null, continue to check.
 825                  */
 826                 if (s[0] == '\0') {
 827                         if (len == 1)
 828                                 return 1;
 829                         if (s[1] == '\0')
 830                                 return 0;
 831                 }
 832                 s++;
 833                 len--;
 834         }
 835
 836         /* Not the null termination, or not done yet: not printable */
 837         if (*s != '\0' || (len != 0))
 838                 return 0;
 839
 840         return 1;
 841 }
 842
 843
 844 /*
 845  * Print the property in the best format, a heuristic guess.  Print as
 846  * a string, concatenated strings, a byte, word, double word, or (if all
 847  * else fails) it is printed as a stream of bytes.
 848  */
 849 static void print_data(const void *data, int len)
 850 {
 851         int j;
 852
 853         /* no data, don't print */
 854         if (len == 0)
 855                 return;
 856
 857         /*
 858          * It is a string, but it may have multiple strings (embedded '\0's).
 859          */
 860         if (is_printable_string(data, len)) {
 861                 puts("\"");
 862                 j = 0;
 863                 while (j < len) {
 864                         if (j > 0)
 865                                 puts("\", \"");
 866                         puts(data);
 867                         j    += strlen(data) + 1;
 868                         data += strlen(data) + 1;
 869                 }
 870                 puts("\"");
 871                 return;
 872         }
 873
 874         if ((len %4) == 0) {
 875                 if (len > CONFIG_CMD_FDT_MAX_DUMP)
 876                         printf("* 0x%p [0x%08x]", data, len);
 877                 else {
 878                         const __be32 *p;
 879
 880                         printf("<");
 881                         for (j = 0, p = data; j < len/4; j++)
 882                                 printf("0x%08x%s", fdt32_to_cpu(p[j]),
 883                                         j < (len/4 - 1) ? " " : "");
 884                         printf(">");
 885                 }
 886         } else { /* anything else... hexdump */
 887                 if (len > CONFIG_CMD_FDT_MAX_DUMP)
 888                         printf("* 0x%p [0x%08x]", data, len);
 889                 else {
 890                         const u8 *s;
 891
 892                         printf("[");
 893                         for (j = 0, s = data; j < len; j++)
 894                                 printf("%02x%s", s[j], j < len - 1 ? " " : "");
 895                         printf("]");
 896                 }
 897         }
 898 }
 899
 900 /****************************************************************************/
 901
 902 /*
 903  * Recursively print (a portion of) the working_fdt.  The depth parameter
 904  * determines how deeply nested the fdt is printed.
 905  */
 906 static int fdt_print(const char *pathp, char *prop, int depth)
 907 {
 908         static char tabs[MAX_LEVEL+1] =
 909                 "\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t"
 910                 "\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t";
 911         const void *nodep;      /* property node pointer */
 912         int  nodeoffset;        /* node offset from libfdt */
 913         int  nextoffset;        /* next node offset from libfdt */
 914         uint32_t tag;           /* tag */
 915         int  len;               /* length of the property */
 916         int  level = 0;         /* keep track of nesting level */
 917         const struct fdt_property *fdt_prop;
 918
 919         nodeoffset = fdt_path_offset (working_fdt, pathp);
 920         if (nodeoffset < 0) {
 921                 /*
 922                  * Not found or something else bad happened.
 923                  */
 924                 printf ("libfdt fdt_path_offset() returned %s\n",
 925                         fdt_strerror(nodeoffset));
 926                 return 1;
 927         }
 928         /*
 929          * The user passed in a property as well as node path.
 930          * Print only the given property and then return.
 931          */
 932         if (prop) {
 933                 nodep = fdt_getprop (working_fdt, nodeoffset, prop, &len);
 934                 if (len == 0) {
 935                         /* no property value */
 936                         printf("%s %s\n", pathp, prop);
 937                         return 0;
 938                 } else if (len > 0) {
 939                         printf("%s = ", prop);
 940                         print_data (nodep, len);
 941                         printf("\n");
 942                         return 0;
 943                 } else {
 944                         printf ("libfdt fdt_getprop(): %s\n",
 945                                 fdt_strerror(len));
 946                         return 1;
 947                 }
 948         }
 949
 950         /*
 951          * The user passed in a node path and no property,
 952          * print the node and all subnodes.
 953          */
 954         while(level >= 0) {
 955                 tag = fdt_next_tag(working_fdt, nodeoffset, &nextoffset);
 956                 switch(tag) {
 957                 case FDT_BEGIN_NODE:
 958                         pathp = fdt_get_name(working_fdt, nodeoffset, NULL);
 959                         if (level <= depth) {
 960                                 if (pathp == NULL)
 961                                         pathp = "/* NULL pointer error */";
 962                                 if (*pathp == '\0')
 963                                         pathp = "/";    /* root is nameless */
 964                                 printf("%s%s {\n",
 965                                         &tabs[MAX_LEVEL - level], pathp);
 966                         }
 967                         level++;
 968                         if (level >= MAX_LEVEL) {
 969                                 printf("Nested too deep, aborting.\n");
 970                                 return 1;
 971                         }
 972                         break;
 973                 case FDT_END_NODE:
 974                         level--;
 975                         if (level <= depth)
 976                                 printf("%s};\n", &tabs[MAX_LEVEL - level]);
 977                         if (level == 0) {
 978                                 level = -1;             /* exit the loop */
 979                         }
 980                         break;
 981                 case FDT_PROP:
 982                         fdt_prop = fdt_offset_ptr(working_fdt, nodeoffset,
 983                                         sizeof(*fdt_prop));
 984                         pathp    = fdt_string(working_fdt,
 985                                         fdt32_to_cpu(fdt_prop->nameoff));
 986                         len      = fdt32_to_cpu(fdt_prop->len);
 987                         nodep    = fdt_prop->data;
 988                         if (len < 0) {
 989                                 printf ("libfdt fdt_getprop(): %s\n",
 990                                         fdt_strerror(len));
 991                                 return 1;
 992                         } else if (len == 0) {
 993                                 /* the property has no value */
 994                                 if (level <= depth)
 995                                         printf("%s%s;\n",
 996                                                 &tabs[MAX_LEVEL - level],
 997                                                 pathp);
 998                         } else {
 999                                 if (level <= depth) {
1000                                         printf("%s%s = ",
1001                                                 &tabs[MAX_LEVEL - level],
1002                                                 pathp);
1003                                         print_data (nodep, len);
1004                                         printf(";\n");
1005                                 }
1006                         }
1007                         break;
1008                 case FDT_NOP:
1009                         printf("%s/* NOP */\n", &tabs[MAX_LEVEL - level]);
1010                         break;
1011                 case FDT_END:
1012                         return 1;
1013                 default:
1014                         if (level <= depth)
1015                                 printf("Unknown tag 0x%08X\n", tag);
1016                         return 1;
1017                 }
1018                 nodeoffset = nextoffset;
1019         }
1020         return 0;
1021 }
1022
1023 /********************************************************************/
1024 #ifdef CONFIG_SYS_LONGHELP
1025 static char fdt_help_text[] =
1026         "addr [-c]  <addr> [<length>]   - Set the [control] fdt location to <addr>\n"
1027 #ifdef CONFIG_OF_BOARD_SETUP
1028         "fdt boardsetup                      - Do board-specific set up\n"
1029 #endif
1030 #ifdef CONFIG_OF_SYSTEM_SETUP
1031         "fdt systemsetup                     - Do system-specific set up\n"
1032 #endif
1033         "fdt move   <fdt> <newaddr> <length> - Copy the fdt to <addr> and make it active\n"
1034         "fdt resize                          - Resize fdt to size + padding to 4k addr\n"
1035         "fdt print  <path> [<prop>]          - Recursive print starting at <path>\n"
1036         "fdt list   <path> [<prop>]          - Print one level starting at <path>\n"
1037         "fdt get value <var> <path> <prop>   - Get <property> and store in <var>\n"
1038         "fdt get name <var> <path> <index>   - Get name of node <index> and store in <var>\n"
1039         "fdt get addr <var> <path> <prop>    - Get start address of <property> and store in <var>\n"
1040         "fdt get size <var> <path> [<prop>]  - Get size of [<property>] or num nodes and store in <var>\n"
1041         "fdt set    <path> <prop> [<val>]    - Set <property> [to <val>]\n"
1042         "fdt mknode <path> <node>            - Create a new node after <path>\n"
1043         "fdt rm     <path> [<prop>]          - Delete the node or <property>\n"
1044         "fdt header                          - Display header info\n"
1045         "fdt bootcpu <id>                    - Set boot cpuid\n"
1046         "fdt memory <addr> <size>            - Add/Update memory node\n"
1047         "fdt rsvmem print                    - Show current mem reserves\n"
1048         "fdt rsvmem add <addr> <size>        - Add a mem reserve\n"
1049         "fdt rsvmem delete <index>           - Delete a mem reserves\n"
1050         "fdt chosen [<start> <end>]          - Add/update the /chosen branch in the tree\n"
1051         "                                        <start>/<end> - initrd start/end addr\n"
1052 #if defined(CONFIG_FIT_SIGNATURE)
1053         "fdt checksign [<addr>]              - check FIT signature\n"
1054         "                                        <start> - addr of key blob\n"
1055         "                                                  default gd->fdt_blob\n"
1056 #endif
1057         "NOTE: Dereference aliases by omiting the leading '/', "
1058                 "e.g. fdt print ethernet0.";
1059 #endif
1060
1061 U_BOOT_CMD(
1062         fdt,    255,    0,      do_fdt,
1063         "flattened device tree utility commands", fdt_help_text
1064 );