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 <mapmem.h>
  19 #include <asm/io.h>
  20
  21 #define MAX_LEVEL       32              /* how deeply nested we will go */
  22 #define SCRATCHPAD      1024            /* bytes of scratchpad memory */
  23 #ifndef CONFIG_CMD_FDT_MAX_DUMP
  24 #define CONFIG_CMD_FDT_MAX_DUMP 64
  25 #endif
  26
  27 /*
  28  * Global data (for the gd->bd)
  29  */
  30 DECLARE_GLOBAL_DATA_PTR;
  31
  32 static int fdt_valid(struct fdt_header **blobp);
  33 static int fdt_parse_prop(char *const*newval, int count, char *data, int *len);
  34 static int fdt_print(const char *pathp, char *prop, int depth);
  35 static int is_printable_string(const void *data, int len);
  36
  37 /*
  38  * The working_fdt points to our working flattened device tree.
  39  */
  40 struct fdt_header *working_fdt;
  41
  42 void set_working_fdt_addr(ulong addr)
  43 {
  44         void *buf;
  45
  46         buf = map_sysmem(addr, 0);
  47         working_fdt = buf;
  48         setenv_hex("fdtaddr", addr);
  49 }
  50
  51 /*
  52  * Get a value from the fdt and format it to be set in the environment
  53  */
  54 static int fdt_value_setenv(const void *nodep, int len, const char *var)
  55 {
  56         if (is_printable_string(nodep, len))
  57                 setenv(var, (void *)nodep);
  58         else if (len == 4) {
  59                 char buf[11];
  60
  61                 sprintf(buf, "0x%08X", *(uint32_t *)nodep);
  62                 setenv(var, buf);
  63         } else if (len%4 == 0 && len <= 20) {
  64                 /* Needed to print things like sha1 hashes. */
  65                 char buf[41];
  66                 int i;
  67
  68                 for (i = 0; i < len; i += sizeof(unsigned int))
  69                         sprintf(buf + (i * 2), "%08x",
  70                                 *(unsigned int *)(nodep + i));
  71                 setenv(var, buf);
  72         } else {
  73                 printf("error: unprintable value\n");
  74                 return 1;
  75         }
  76         return 0;
  77 }
  78
  79 /*
  80  * Flattened Device Tree command, see the help for parameter definitions.
  81  */
  82 static int do_fdt(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
  83 {
  84         if (argc < 2)
  85                 return CMD_RET_USAGE;
  86
  87         /*
  88          * Set the address of the fdt
  89          */
  90         if (strncmp(argv[1], "ad", 2) == 0) {
  91                 unsigned long addr;
  92                 int control = 0;
  93                 struct fdt_header *blob;
  94                 /*
  95                  * Set the address [and length] of the fdt.
  96                  */
  97                 argc -= 2;
  98                 argv += 2;
  99 /* Temporary #ifdef - some archs don't have fdt_blob yet */
 100 #ifdef CONFIG_OF_CONTROL
 101                 if (argc && !strcmp(*argv, "-c")) {
 102                         control = 1;
 103                         argc--;
 104                         argv++;
 105                 }
 106 #endif
 107                 if (argc == 0) {
 108                         if (control)
 109                                 blob = (struct fdt_header *)gd->fdt_blob;
 110                         else
 111                                 blob = working_fdt;
 112                         if (!blob || !fdt_valid(&blob))
 113                                 return 1;
 114                         printf("The address of the fdt is %#08lx\n",
 115                                control ? (ulong)map_to_sysmem(blob) :
 116                                         getenv_hex("fdtaddr", 0));
 117                         return 0;
 118                 }
 119
 120                 addr = simple_strtoul(argv[0], NULL, 16);
 121                 blob = map_sysmem(addr, 0);
 122                 if (!fdt_valid(&blob))
 123                         return 1;
 124                 if (control)
 125                         gd->fdt_blob = blob;
 126                 else
 127                         set_working_fdt_addr(addr);
 128
 129                 if (argc >= 2) {
 130                         int  len;
 131                         int  err;
 132                         /*
 133                          * Optional new length
 134                          */
 135                         len = simple_strtoul(argv[1], NULL, 16);
 136                         if (len < fdt_totalsize(blob)) {
 137                                 printf ("New length %d < existing length %d, "
 138                                         "ignoring.\n",
 139                                         len, fdt_totalsize(blob));
 140                         } else {
 141                                 /*
 142                                  * Open in place with a new length.
 143                                  */
 144                                 err = fdt_open_into(blob, blob, len);
 145                                 if (err != 0) {
 146                                         printf ("libfdt fdt_open_into(): %s\n",
 147                                                 fdt_strerror(err));
 148                                 }
 149                         }
 150                 }
 151
 152                 return CMD_RET_SUCCESS;
 153         }
 154
 155         if (!working_fdt) {
 156                 puts(
 157                         "No FDT memory address configured. Please configure\n"
 158                         "the FDT address via \"fdt addr <address>\" command.\n"
 159                         "Aborting!\n");
 160                 return CMD_RET_FAILURE;
 161         }
 162
 163         /*
 164          * Move the working_fdt
 165          */
 166         if (strncmp(argv[1], "mo", 2) == 0) {
 167                 struct fdt_header *newaddr;
 168                 int  len;
 169                 int  err;
 170
 171                 if (argc < 4)
 172                         return CMD_RET_USAGE;
 173
 174                 /*
 175                  * Set the address and length of the fdt.
 176                  */
 177                 working_fdt = (struct fdt_header *)simple_strtoul(argv[2], NULL, 16);
 178                 if (!fdt_valid(&working_fdt))
 179                         return 1;
 180
 181                 newaddr = (struct fdt_header *)simple_strtoul(argv[3],NULL,16);
 182
 183                 /*
 184                  * If the user specifies a length, use that.  Otherwise use the
 185                  * current length.
 186                  */
 187                 if (argc <= 4) {
 188                         len = fdt_totalsize(working_fdt);
 189                 } else {
 190                         len = simple_strtoul(argv[4], NULL, 16);
 191                         if (len < fdt_totalsize(working_fdt)) {
 192                                 printf ("New length 0x%X < existing length "
 193                                         "0x%X, aborting.\n",
 194                                         len, fdt_totalsize(working_fdt));
 195                                 return 1;
 196                         }
 197                 }
 198
 199                 /*
 200                  * Copy to the new location.
 201                  */
 202                 err = fdt_open_into(working_fdt, newaddr, len);
 203                 if (err != 0) {
 204                         printf ("libfdt fdt_open_into(): %s\n",
 205                                 fdt_strerror(err));
 206                         return 1;
 207                 }
 208                 working_fdt = newaddr;
 209
 210         /*
 211          * Make a new node
 212          */
 213         } else if (strncmp(argv[1], "mk", 2) == 0) {
 214                 char *pathp;            /* path */
 215                 char *nodep;            /* new node to add */
 216                 int  nodeoffset;        /* node offset from libfdt */
 217                 int  err;
 218
 219                 /*
 220                  * Parameters: Node path, new node to be appended to the path.
 221                  */
 222                 if (argc < 4)
 223                         return CMD_RET_USAGE;
 224
 225                 pathp = argv[2];
 226                 nodep = argv[3];
 227
 228                 nodeoffset = fdt_path_offset (working_fdt, pathp);
 229                 if (nodeoffset < 0) {
 230                         /*
 231                          * Not found or something else bad happened.
 232                          */
 233                         printf ("libfdt fdt_path_offset() returned %s\n",
 234                                 fdt_strerror(nodeoffset));
 235                         return 1;
 236                 }
 237                 err = fdt_add_subnode(working_fdt, nodeoffset, nodep);
 238                 if (err < 0) {
 239                         printf ("libfdt fdt_add_subnode(): %s\n",
 240                                 fdt_strerror(err));
 241                         return 1;
 242                 }
 243
 244         /*
 245          * Set the value of a property in the working_fdt.
 246          */
 247         } else if (argv[1][0] == 's') {
 248                 char *pathp;            /* path */
 249                 char *prop;             /* property */
 250                 int  nodeoffset;        /* node offset from libfdt */
 251                 static char data[SCRATCHPAD];   /* storage for the property */
 252                 int  len;               /* new length of the property */
 253                 int  ret;               /* return value */
 254
 255                 /*
 256                  * Parameters: Node path, property, optional value.
 257                  */
 258                 if (argc < 4)
 259                         return CMD_RET_USAGE;
 260
 261                 pathp  = argv[2];
 262                 prop   = argv[3];
 263                 if (argc == 4) {
 264                         len = 0;
 265                 } else {
 266                         ret = fdt_parse_prop(&argv[4], argc - 4, data, &len);
 267                         if (ret != 0)
 268                                 return ret;
 269                 }
 270
 271                 nodeoffset = fdt_path_offset (working_fdt, pathp);
 272                 if (nodeoffset < 0) {
 273                         /*
 274                          * Not found or something else bad happened.
 275                          */
 276                         printf ("libfdt fdt_path_offset() returned %s\n",
 277                                 fdt_strerror(nodeoffset));
 278                         return 1;
 279                 }
 280
 281                 ret = fdt_setprop(working_fdt, nodeoffset, prop, data, len);
 282                 if (ret < 0) {
 283                         printf ("libfdt fdt_setprop(): %s\n", fdt_strerror(ret));
 284                         return 1;
 285                 }
 286
 287         /********************************************************************
 288          * Get the value of a property in the working_fdt.
 289          ********************************************************************/
 290         } else if (argv[1][0] == 'g') {
 291                 char *subcmd;           /* sub-command */
 292                 char *pathp;            /* path */
 293                 char *prop;             /* property */
 294                 char *var;              /* variable to store result */
 295                 int  nodeoffset;        /* node offset from libfdt */
 296                 const void *nodep;      /* property node pointer */
 297                 int  len = 0;           /* new length of the property */
 298
 299                 /*
 300                  * Parameters: Node path, property, optional value.
 301                  */
 302                 if (argc < 5)
 303                         return CMD_RET_USAGE;
 304
 305                 subcmd = argv[2];
 306
 307                 if (argc < 6 && subcmd[0] != 's')
 308                         return CMD_RET_USAGE;
 309
 310                 var    = argv[3];
 311                 pathp  = argv[4];
 312                 prop   = argv[5];
 313
 314                 nodeoffset = fdt_path_offset(working_fdt, pathp);
 315                 if (nodeoffset < 0) {
 316                         /*
 317                          * Not found or something else bad happened.
 318                          */
 319                         printf("libfdt fdt_path_offset() returned %s\n",
 320                                 fdt_strerror(nodeoffset));
 321                         return 1;
 322                 }
 323
 324                 if (subcmd[0] == 'n' || (subcmd[0] == 's' && argc == 5)) {
 325                         int reqIndex = -1;
 326                         int startDepth = fdt_node_depth(
 327                                 working_fdt, nodeoffset);
 328                         int curDepth = startDepth;
 329                         int curIndex = -1;
 330                         int nextNodeOffset = fdt_next_node(
 331                                 working_fdt, nodeoffset, &curDepth);
 332
 333                         if (subcmd[0] == 'n')
 334                                 reqIndex = simple_strtoul(argv[5], NULL, 16);
 335
 336                         while (curDepth > startDepth) {
 337                                 if (curDepth == startDepth + 1)
 338                                         curIndex++;
 339                                 if (subcmd[0] == 'n' && curIndex == reqIndex) {
 340                                         const char *nodeName = fdt_get_name(
 341                                             working_fdt, nextNodeOffset, NULL);
 342
 343                                         setenv(var, (char *)nodeName);
 344                                         return 0;
 345                                 }
 346                                 nextNodeOffset = fdt_next_node(
 347                                         working_fdt, nextNodeOffset, &curDepth);
 348                                 if (nextNodeOffset < 0)
 349                                         break;
 350                         }
 351                         if (subcmd[0] == 's') {
 352                                 /* get the num nodes at this level */
 353                                 setenv_ulong(var, curIndex + 1);
 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                 int err = ft_board_setup(working_fdt, gd->bd);
 572
 573                 if (err) {
 574                         printf("Failed to update board information in FDT: %s\n",
 575                                fdt_strerror(err));
 576                         return CMD_RET_FAILURE;
 577                 }
 578         }
 579 #endif
 580 #ifdef CONFIG_OF_SYSTEM_SETUP
 581         /* Call the board-specific fixup routine */
 582         else if (strncmp(argv[1], "sys", 3) == 0) {
 583                 int err = ft_system_setup(working_fdt, gd->bd);
 584
 585                 if (err) {
 586                         printf("Failed to add system information to FDT: %s\n",
 587                                fdt_strerror(err));
 588                         return CMD_RET_FAILURE;
 589                 }
 590         }
 591 #endif
 592         /* Create a chosen node */
 593         else if (strncmp(argv[1], "cho", 3) == 0) {
 594                 unsigned long initrd_start = 0, initrd_end = 0;
 595
 596                 if ((argc != 2) && (argc != 4))
 597                         return CMD_RET_USAGE;
 598
 599                 if (argc == 4) {
 600                         initrd_start = simple_strtoul(argv[2], NULL, 16);
 601                         initrd_end = simple_strtoul(argv[3], NULL, 16);
 602                 }
 603
 604                 fdt_chosen(working_fdt);
 605                 fdt_initrd(working_fdt, initrd_start, initrd_end);
 606
 607 #if defined(CONFIG_FIT_SIGNATURE)
 608         } else if (strncmp(argv[1], "che", 3) == 0) {
 609                 int cfg_noffset;
 610                 int ret;
 611                 unsigned long addr;
 612                 struct fdt_header *blob;
 613
 614                 if (!working_fdt)
 615                         return CMD_RET_FAILURE;
 616
 617                 if (argc > 2) {
 618                         addr = simple_strtoul(argv[2], NULL, 16);
 619                         blob = map_sysmem(addr, 0);
 620                 } else {
 621                         blob = (struct fdt_header *)gd->fdt_blob;
 622                 }
 623                 if (!fdt_valid(&blob))
 624                         return 1;
 625
 626                 gd->fdt_blob = blob;
 627                 cfg_noffset = fit_conf_get_node(working_fdt, NULL);
 628                 if (!cfg_noffset) {
 629                         printf("Could not find configuration node: %s\n",
 630                                fdt_strerror(cfg_noffset));
 631                         return CMD_RET_FAILURE;
 632                 }
 633
 634                 ret = fit_config_verify(working_fdt, cfg_noffset);
 635                 if (ret == 0)
 636                         return CMD_RET_SUCCESS;
 637                 else
 638                         return CMD_RET_FAILURE;
 639 #endif
 640
 641         }
 642 #ifdef CONFIG_OF_LIBFDT_OVERLAY
 643         /* apply an overlay */
 644         else if (strncmp(argv[1], "ap", 2) == 0) {
 645                 unsigned long addr;
 646                 struct fdt_header *blob;
 647
 648                 if (argc != 3)
 649                         return CMD_RET_USAGE;
 650
 651                 if (!working_fdt)
 652                         return CMD_RET_FAILURE;
 653
 654                 addr = simple_strtoul(argv[2], NULL, 16);
 655                 blob = map_sysmem(addr, 0);
 656                 if (!fdt_valid(&blob))
 657                         return CMD_RET_FAILURE;
 658
 659                 if (fdt_overlay_apply(working_fdt, blob))
 660                         return CMD_RET_FAILURE;
 661         }
 662 #endif
 663         /* resize the fdt */
 664         else if (strncmp(argv[1], "re", 2) == 0) {
 665                 fdt_shrink_to_minimum(working_fdt);
 666         }
 667         else {
 668                 /* Unrecognized command */
 669                 return CMD_RET_USAGE;
 670         }
 671
 672         return 0;
 673 }
 674
 675 /****************************************************************************/
 676
 677 /**
 678  * fdt_valid() - Check if an FDT is valid. If not, change it to NULL
 679  *
 680  * @blobp: Pointer to FDT pointer
 681  * @return 1 if OK, 0 if bad (in which case *blobp is set to NULL)
 682  */
 683 static int fdt_valid(struct fdt_header **blobp)
 684 {
 685         const void *blob = *blobp;
 686         int err;
 687
 688         if (blob == NULL) {
 689                 printf ("The address of the fdt is invalid (NULL).\n");
 690                 return 0;
 691         }
 692
 693         err = fdt_check_header(blob);
 694         if (err == 0)
 695                 return 1;       /* valid */
 696
 697         if (err < 0) {
 698                 printf("libfdt fdt_check_header(): %s", fdt_strerror(err));
 699                 /*
 700                  * Be more informative on bad version.
 701                  */
 702                 if (err == -FDT_ERR_BADVERSION) {
 703                         if (fdt_version(blob) <
 704                             FDT_FIRST_SUPPORTED_VERSION) {
 705                                 printf (" - too old, fdt %d < %d",
 706                                         fdt_version(blob),
 707                                         FDT_FIRST_SUPPORTED_VERSION);
 708                         }
 709                         if (fdt_last_comp_version(blob) >
 710                             FDT_LAST_SUPPORTED_VERSION) {
 711                                 printf (" - too new, fdt %d > %d",
 712                                         fdt_version(blob),
 713                                         FDT_LAST_SUPPORTED_VERSION);
 714                         }
 715                 }
 716                 printf("\n");
 717                 *blobp = NULL;
 718                 return 0;
 719         }
 720         return 1;
 721 }
 722
 723 /****************************************************************************/
 724
 725 /*
 726  * Parse the user's input, partially heuristic.  Valid formats:
 727  * <0x00112233 4 05>    - an array of cells.  Numbers follow standard
 728  *                      C conventions.
 729  * [00 11 22 .. nn] - byte stream
 730  * "string"     - If the the value doesn't start with "<" or "[", it is
 731  *                      treated as a string.  Note that the quotes are
 732  *                      stripped by the parser before we get the string.
 733  * newval: An array of strings containing the new property as specified
 734  *      on the command line
 735  * count: The number of strings in the array
 736  * data: A bytestream to be placed in the property
 737  * len: The length of the resulting bytestream
 738  */
 739 static int fdt_parse_prop(char * const *newval, int count, char *data, int *len)
 740 {
 741         char *cp;               /* temporary char pointer */
 742         char *newp;             /* temporary newval char pointer */
 743         unsigned long tmp;      /* holds converted values */
 744         int stridx = 0;
 745
 746         *len = 0;
 747         newp = newval[0];
 748
 749         /* An array of cells */
 750         if (*newp == '<') {
 751                 newp++;
 752                 while ((*newp != '>') && (stridx < count)) {
 753                         /*
 754                          * Keep searching until we find that last ">"
 755                          * That way users don't have to escape the spaces
 756                          */
 757                         if (*newp == '\0') {
 758                                 newp = newval[++stridx];
 759                                 continue;
 760                         }
 761
 762                         cp = newp;
 763                         tmp = simple_strtoul(cp, &newp, 0);
 764                         *(__be32 *)data = __cpu_to_be32(tmp);
 765                         data  += 4;
 766                         *len += 4;
 767
 768                         /* If the ptr didn't advance, something went wrong */
 769                         if ((newp - cp) <= 0) {
 770                                 printf("Sorry, I could not convert \"%s\"\n",
 771                                         cp);
 772                                 return 1;
 773                         }
 774
 775                         while (*newp == ' ')
 776                                 newp++;
 777                 }
 778
 779                 if (*newp != '>') {
 780                         printf("Unexpected character '%c'\n", *newp);
 781                         return 1;
 782                 }
 783         } else if (*newp == '[') {
 784                 /*
 785                  * Byte stream.  Convert the values.
 786                  */
 787                 newp++;
 788                 while ((stridx < count) && (*newp != ']')) {
 789                         while (*newp == ' ')
 790                                 newp++;
 791                         if (*newp == '\0') {
 792                                 newp = newval[++stridx];
 793                                 continue;
 794                         }
 795                         if (!isxdigit(*newp))
 796                                 break;
 797                         tmp = simple_strtoul(newp, &newp, 16);
 798                         *data++ = tmp & 0xFF;
 799                         *len    = *len + 1;
 800                 }
 801                 if (*newp != ']') {
 802                         printf("Unexpected character '%c'\n", *newp);
 803                         return 1;
 804                 }
 805         } else {
 806                 /*
 807                  * Assume it is one or more strings.  Copy it into our
 808                  * data area for convenience (including the
 809                  * terminating '\0's).
 810                  */
 811                 while (stridx < count) {
 812                         size_t length = strlen(newp) + 1;
 813                         strcpy(data, newp);
 814                         data += length;
 815                         *len += length;
 816                         newp = newval[++stridx];
 817                 }
 818         }
 819         return 0;
 820 }
 821
 822 /****************************************************************************/
 823
 824 /*
 825  * Heuristic to guess if this is a string or concatenated strings.
 826  */
 827
 828 static int is_printable_string(const void *data, int len)
 829 {
 830         const char *s = data;
 831
 832         /* zero length is not */
 833         if (len == 0)
 834                 return 0;
 835
 836         /* must terminate with zero or '\n' */
 837         if (s[len - 1] != '\0' && s[len - 1] != '\n')
 838                 return 0;
 839
 840         /* printable or a null byte (concatenated strings) */
 841         while (((*s == '\0') || isprint(*s) || isspace(*s)) && (len > 0)) {
 842                 /*
 843                  * If we see a null, there are three possibilities:
 844                  * 1) If len == 1, it is the end of the string, printable
 845                  * 2) Next character also a null, not printable.
 846                  * 3) Next character not a null, continue to check.
 847                  */
 848                 if (s[0] == '\0') {
 849                         if (len == 1)
 850                                 return 1;
 851                         if (s[1] == '\0')
 852                                 return 0;
 853                 }
 854                 s++;
 855                 len--;
 856         }
 857
 858         /* Not the null termination, or not done yet: not printable */
 859         if (*s != '\0' || (len != 0))
 860                 return 0;
 861
 862         return 1;
 863 }
 864
 865
 866 /*
 867  * Print the property in the best format, a heuristic guess.  Print as
 868  * a string, concatenated strings, a byte, word, double word, or (if all
 869  * else fails) it is printed as a stream of bytes.
 870  */
 871 static void print_data(const void *data, int len)
 872 {
 873         int j;
 874
 875         /* no data, don't print */
 876         if (len == 0)
 877                 return;
 878
 879         /*
 880          * It is a string, but it may have multiple strings (embedded '\0's).
 881          */
 882         if (is_printable_string(data, len)) {
 883                 puts("\"");
 884                 j = 0;
 885                 while (j < len) {
 886                         if (j > 0)
 887                                 puts("\", \"");
 888                         puts(data);
 889                         j    += strlen(data) + 1;
 890                         data += strlen(data) + 1;
 891                 }
 892                 puts("\"");
 893                 return;
 894         }
 895
 896         if ((len %4) == 0) {
 897                 if (len > CONFIG_CMD_FDT_MAX_DUMP)
 898                         printf("* 0x%p [0x%08x]", data, len);
 899                 else {
 900                         const __be32 *p;
 901
 902                         printf("<");
 903                         for (j = 0, p = data; j < len/4; j++)
 904                                 printf("0x%08x%s", fdt32_to_cpu(p[j]),
 905                                         j < (len/4 - 1) ? " " : "");
 906                         printf(">");
 907                 }
 908         } else { /* anything else... hexdump */
 909                 if (len > CONFIG_CMD_FDT_MAX_DUMP)
 910                         printf("* 0x%p [0x%08x]", data, len);
 911                 else {
 912                         const u8 *s;
 913
 914                         printf("[");
 915                         for (j = 0, s = data; j < len; j++)
 916                                 printf("%02x%s", s[j], j < len - 1 ? " " : "");
 917                         printf("]");
 918                 }
 919         }
 920 }
 921
 922 /****************************************************************************/
 923
 924 /*
 925  * Recursively print (a portion of) the working_fdt.  The depth parameter
 926  * determines how deeply nested the fdt is printed.
 927  */
 928 static int fdt_print(const char *pathp, char *prop, int depth)
 929 {
 930         static char tabs[MAX_LEVEL+1] =
 931                 "\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t"
 932                 "\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t";
 933         const void *nodep;      /* property node pointer */
 934         int  nodeoffset;        /* node offset from libfdt */
 935         int  nextoffset;        /* next node offset from libfdt */
 936         uint32_t tag;           /* tag */
 937         int  len;               /* length of the property */
 938         int  level = 0;         /* keep track of nesting level */
 939         const struct fdt_property *fdt_prop;
 940
 941         nodeoffset = fdt_path_offset (working_fdt, pathp);
 942         if (nodeoffset < 0) {
 943                 /*
 944                  * Not found or something else bad happened.
 945                  */
 946                 printf ("libfdt fdt_path_offset() returned %s\n",
 947                         fdt_strerror(nodeoffset));
 948                 return 1;
 949         }
 950         /*
 951          * The user passed in a property as well as node path.
 952          * Print only the given property and then return.
 953          */
 954         if (prop) {
 955                 nodep = fdt_getprop (working_fdt, nodeoffset, prop, &len);
 956                 if (len == 0) {
 957                         /* no property value */
 958                         printf("%s %s\n", pathp, prop);
 959                         return 0;
 960                 } else if (len > 0) {
 961                         printf("%s = ", prop);
 962                         print_data (nodep, len);
 963                         printf("\n");
 964                         return 0;
 965                 } else {
 966                         printf ("libfdt fdt_getprop(): %s\n",
 967                                 fdt_strerror(len));
 968                         return 1;
 969                 }
 970         }
 971
 972         /*
 973          * The user passed in a node path and no property,
 974          * print the node and all subnodes.
 975          */
 976         while(level >= 0) {
 977                 tag = fdt_next_tag(working_fdt, nodeoffset, &nextoffset);
 978                 switch(tag) {
 979                 case FDT_BEGIN_NODE:
 980                         pathp = fdt_get_name(working_fdt, nodeoffset, NULL);
 981                         if (level <= depth) {
 982                                 if (pathp == NULL)
 983                                         pathp = "/* NULL pointer error */";
 984                                 if (*pathp == '\0')
 985                                         pathp = "/";    /* root is nameless */
 986                                 printf("%s%s {\n",
 987                                         &tabs[MAX_LEVEL - level], pathp);
 988                         }
 989                         level++;
 990                         if (level >= MAX_LEVEL) {
 991                                 printf("Nested too deep, aborting.\n");
 992                                 return 1;
 993                         }
 994                         break;
 995                 case FDT_END_NODE:
 996                         level--;
 997                         if (level <= depth)
 998                                 printf("%s};\n", &tabs[MAX_LEVEL - level]);
 999                         if (level == 0) {
1000                                 level = -1;             /* exit the loop */
1001                         }
1002                         break;
1003                 case FDT_PROP:
1004                         fdt_prop = fdt_offset_ptr(working_fdt, nodeoffset,
1005                                         sizeof(*fdt_prop));
1006                         pathp    = fdt_string(working_fdt,
1007                                         fdt32_to_cpu(fdt_prop->nameoff));
1008                         len      = fdt32_to_cpu(fdt_prop->len);
1009                         nodep    = fdt_prop->data;
1010                         if (len < 0) {
1011                                 printf ("libfdt fdt_getprop(): %s\n",
1012                                         fdt_strerror(len));
1013                                 return 1;
1014                         } else if (len == 0) {
1015                                 /* the property has no value */
1016                                 if (level <= depth)
1017                                         printf("%s%s;\n",
1018                                                 &tabs[MAX_LEVEL - level],
1019                                                 pathp);
1020                         } else {
1021                                 if (level <= depth) {
1022                                         printf("%s%s = ",
1023                                                 &tabs[MAX_LEVEL - level],
1024                                                 pathp);
1025                                         print_data (nodep, len);
1026                                         printf(";\n");
1027                                 }
1028                         }
1029                         break;
1030                 case FDT_NOP:
1031                         printf("%s/* NOP */\n", &tabs[MAX_LEVEL - level]);
1032                         break;
1033                 case FDT_END:
1034                         return 1;
1035                 default:
1036                         if (level <= depth)
1037                                 printf("Unknown tag 0x%08X\n", tag);
1038                         return 1;
1039                 }
1040                 nodeoffset = nextoffset;
1041         }
1042         return 0;
1043 }
1044
1045 /********************************************************************/
1046 #ifdef CONFIG_SYS_LONGHELP
1047 static char fdt_help_text[] =
1048         "addr [-c]  <addr> [<length>]   - Set the [control] fdt location to <addr>\n"
1049 #ifdef CONFIG_OF_LIBFDT_OVERLAY
1050         "fdt apply <addr>                    - Apply overlay to the DT\n"
1051 #endif
1052 #ifdef CONFIG_OF_BOARD_SETUP
1053         "fdt boardsetup                      - Do board-specific set up\n"
1054 #endif
1055 #ifdef CONFIG_OF_SYSTEM_SETUP
1056         "fdt systemsetup                     - Do system-specific set up\n"
1057 #endif
1058         "fdt move   <fdt> <newaddr> <length> - Copy the fdt to <addr> and make it active\n"
1059         "fdt resize                          - Resize fdt to size + padding to 4k addr\n"
1060         "fdt print  <path> [<prop>]          - Recursive print starting at <path>\n"
1061         "fdt list   <path> [<prop>]          - Print one level starting at <path>\n"
1062         "fdt get value <var> <path> <prop>   - Get <property> and store in <var>\n"
1063         "fdt get name <var> <path> <index>   - Get name of node <index> and store in <var>\n"
1064         "fdt get addr <var> <path> <prop>    - Get start address of <property> and store in <var>\n"
1065         "fdt get size <var> <path> [<prop>]  - Get size of [<property>] or num nodes and store in <var>\n"
1066         "fdt set    <path> <prop> [<val>]    - Set <property> [to <val>]\n"
1067         "fdt mknode <path> <node>            - Create a new node after <path>\n"
1068         "fdt rm     <path> [<prop>]          - Delete the node or <property>\n"
1069         "fdt header                          - Display header info\n"
1070         "fdt bootcpu <id>                    - Set boot cpuid\n"
1071         "fdt memory <addr> <size>            - Add/Update memory node\n"
1072         "fdt rsvmem print                    - Show current mem reserves\n"
1073         "fdt rsvmem add <addr> <size>        - Add a mem reserve\n"
1074         "fdt rsvmem delete <index>           - Delete a mem reserves\n"
1075         "fdt chosen [<start> <end>]          - Add/update the /chosen branch in the tree\n"
1076         "                                        <start>/<end> - initrd start/end addr\n"
1077 #if defined(CONFIG_FIT_SIGNATURE)
1078         "fdt checksign [<addr>]              - check FIT signature\n"
1079         "                                        <start> - addr of key blob\n"
1080         "                                                  default gd->fdt_blob\n"
1081 #endif
1082         "NOTE: Dereference aliases by omitting the leading '/', "
1083                 "e.g. fdt print ethernet0.";
1084 #endif
1085
1086 U_BOOT_CMD(
1087         fdt,    255,    0,      do_fdt,
1088         "flattened device tree utility commands", fdt_help_text
1089 );