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 #define CMD_FDT_MAX_DUMP 64
  24
  25 /*
  26  * Global data (for the gd->bd)
  27  */
  28 DECLARE_GLOBAL_DATA_PTR;
  29
  30 static int fdt_valid(struct fdt_header **blobp);
  31 static int fdt_parse_prop(char *const*newval, int count, char *data, int *len);
  32 static int fdt_print(const char *pathp, char *prop, int depth);
  33 static int is_printable_string(const void *data, int len);
  34
  35 /*
  36  * The working_fdt points to our working flattened device tree.
  37  */
  38 struct fdt_header *working_fdt;
  39
  40 void set_working_fdt_addr(ulong addr)
  41 {
  42         void *buf;
  43
  44         buf = map_sysmem(addr, 0);
  45         working_fdt = buf;
  46         setenv_hex("fdtaddr", addr);
  47 }
  48
  49 /*
  50  * Get a value from the fdt and format it to be set in the environment
  51  */
  52 static int fdt_value_setenv(const void *nodep, int len, const char *var)
  53 {
  54         if (is_printable_string(nodep, len))
  55                 setenv(var, (void *)nodep);
  56         else if (len == 4) {
  57                 char buf[11];
  58
  59                 sprintf(buf, "0x%08X", fdt32_to_cpu(*(fdt32_t *)nodep));
  60                 setenv(var, buf);
  61         } else if (len%4 == 0 && len <= 20) {
  62                 /* Needed to print things like sha1 hashes. */
  63                 char buf[41];
  64                 int i;
  65
  66                 for (i = 0; i < len; i += sizeof(unsigned int))
  67                         sprintf(buf + (i * 2), "%08x",
  68                                 *(unsigned int *)(nodep + i));
  69                 setenv(var, buf);
  70         } else {
  71                 printf("error: unprintable value\n");
  72                 return 1;
  73         }
  74         return 0;
  75 }
  76
  77 /*
  78  * Flattened Device Tree command, see the help for parameter definitions.
  79  */
  80 static int do_fdt(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
  81 {
  82         if (argc < 2)
  83                 return CMD_RET_USAGE;
  84
  85         /*
  86          * Set the address of the fdt
  87          */
  88         if (strncmp(argv[1], "ad", 2) == 0) {
  89                 unsigned long addr;
  90                 int control = 0;
  91                 struct fdt_header *blob;
  92                 /*
  93                  * Set the address [and length] of the fdt.
  94                  */
  95                 argc -= 2;
  96                 argv += 2;
  97 /* Temporary #ifdef - some archs don't have fdt_blob yet */
  98 #ifdef CONFIG_OF_CONTROL
  99                 if (argc && !strcmp(*argv, "-c")) {
 100                         control = 1;
 101                         argc--;
 102                         argv++;
 103                 }
 104 #endif
 105                 if (argc == 0) {
 106                         if (control)
 107                                 blob = (struct fdt_header *)gd->fdt_blob;
 108                         else
 109                                 blob = working_fdt;
 110                         if (!blob || !fdt_valid(&blob))
 111                                 return 1;
 112                         printf("The address of the fdt is %#08lx\n",
 113                                control ? (ulong)map_to_sysmem(blob) :
 114                                         getenv_hex("fdtaddr", 0));
 115                         return 0;
 116                 }
 117
 118                 addr = simple_strtoul(argv[0], NULL, 16);
 119                 blob = map_sysmem(addr, 0);
 120                 if (!fdt_valid(&blob))
 121                         return 1;
 122                 if (control)
 123                         gd->fdt_blob = blob;
 124                 else
 125                         set_working_fdt_addr(addr);
 126
 127                 if (argc >= 2) {
 128                         int  len;
 129                         int  err;
 130                         /*
 131                          * Optional new length
 132                          */
 133                         len = simple_strtoul(argv[1], NULL, 16);
 134                         if (len < fdt_totalsize(blob)) {
 135                                 printf ("New length %d < existing length %d, "
 136                                         "ignoring.\n",
 137                                         len, fdt_totalsize(blob));
 138                         } else {
 139                                 /*
 140                                  * Open in place with a new length.
 141                                  */
 142                                 err = fdt_open_into(blob, blob, len);
 143                                 if (err != 0) {
 144                                         printf ("libfdt fdt_open_into(): %s\n",
 145                                                 fdt_strerror(err));
 146                                 }
 147                         }
 148                 }
 149
 150                 return CMD_RET_SUCCESS;
 151         }
 152
 153         if (!working_fdt) {
 154                 puts(
 155                         "No FDT memory address configured. Please configure\n"
 156                         "the FDT address via \"fdt addr <address>\" command.\n"
 157                         "Aborting!\n");
 158                 return CMD_RET_FAILURE;
 159         }
 160
 161         /*
 162          * Move the working_fdt
 163          */
 164         if (strncmp(argv[1], "mo", 2) == 0) {
 165                 struct fdt_header *newaddr;
 166                 int  len;
 167                 int  err;
 168
 169                 if (argc < 4)
 170                         return CMD_RET_USAGE;
 171
 172                 /*
 173                  * Set the address and length of the fdt.
 174                  */
 175                 working_fdt = (struct fdt_header *)simple_strtoul(argv[2], NULL, 16);
 176                 if (!fdt_valid(&working_fdt))
 177                         return 1;
 178
 179                 newaddr = (struct fdt_header *)simple_strtoul(argv[3],NULL,16);
 180
 181                 /*
 182                  * If the user specifies a length, use that.  Otherwise use the
 183                  * current length.
 184                  */
 185                 if (argc <= 4) {
 186                         len = fdt_totalsize(working_fdt);
 187                 } else {
 188                         len = simple_strtoul(argv[4], NULL, 16);
 189                         if (len < fdt_totalsize(working_fdt)) {
 190                                 printf ("New length 0x%X < existing length "
 191                                         "0x%X, aborting.\n",
 192                                         len, fdt_totalsize(working_fdt));
 193                                 return 1;
 194                         }
 195                 }
 196
 197                 /*
 198                  * Copy to the new location.
 199                  */
 200                 err = fdt_open_into(working_fdt, newaddr, len);
 201                 if (err != 0) {
 202                         printf ("libfdt fdt_open_into(): %s\n",
 203                                 fdt_strerror(err));
 204                         return 1;
 205                 }
 206                 working_fdt = newaddr;
 207 #ifdef CONFIG_OF_SYSTEM_SETUP
 208         /* Call the board-specific fixup routine */
 209         } else if (strncmp(argv[1], "sys", 3) == 0) {
 210                 int err = ft_system_setup(working_fdt, gd->bd);
 211
 212                 if (err) {
 213                         printf("Failed to add system information to FDT: %s\n",
 214                                fdt_strerror(err));
 215                         return CMD_RET_FAILURE;
 216                 }
 217 #endif
 218         /*
 219          * Make a new node
 220          */
 221         } else if (strncmp(argv[1], "mk", 2) == 0) {
 222                 char *pathp;            /* path */
 223                 char *nodep;            /* new node to add */
 224                 int  nodeoffset;        /* node offset from libfdt */
 225                 int  err;
 226
 227                 /*
 228                  * Parameters: Node path, new node to be appended to the path.
 229                  */
 230                 if (argc < 4)
 231                         return CMD_RET_USAGE;
 232
 233                 pathp = argv[2];
 234                 nodep = argv[3];
 235
 236                 nodeoffset = fdt_path_offset (working_fdt, pathp);
 237                 if (nodeoffset < 0) {
 238                         /*
 239                          * Not found or something else bad happened.
 240                          */
 241                         printf ("libfdt fdt_path_offset() returned %s\n",
 242                                 fdt_strerror(nodeoffset));
 243                         return 1;
 244                 }
 245                 err = fdt_add_subnode(working_fdt, nodeoffset, nodep);
 246                 if (err < 0) {
 247                         printf ("libfdt fdt_add_subnode(): %s\n",
 248                                 fdt_strerror(err));
 249                         return 1;
 250                 }
 251
 252         /*
 253          * Set the value of a property in the working_fdt.
 254          */
 255         } else if (argv[1][0] == 's') {
 256                 char *pathp;            /* path */
 257                 char *prop;             /* property */
 258                 int  nodeoffset;        /* node offset from libfdt */
 259                 static char data[SCRATCHPAD];   /* storage for the property */
 260                 const void *ptmp;
 261                 int  len;               /* new length of the property */
 262                 int  ret;               /* return value */
 263
 264                 /*
 265                  * Parameters: Node path, property, optional value.
 266                  */
 267                 if (argc < 4)
 268                         return CMD_RET_USAGE;
 269
 270                 pathp  = argv[2];
 271                 prop   = argv[3];
 272
 273                 nodeoffset = fdt_path_offset (working_fdt, pathp);
 274                 if (nodeoffset < 0) {
 275                         /*
 276                          * Not found or something else bad happened.
 277                          */
 278                         printf ("libfdt fdt_path_offset() returned %s\n",
 279                                 fdt_strerror(nodeoffset));
 280                         return 1;
 281                 }
 282
 283                 if (argc == 4) {
 284                         len = 0;
 285                 } else {
 286                         ptmp = fdt_getprop(working_fdt, nodeoffset, prop, &len);
 287                         if (!ptmp) {
 288                                 printf("prop (%s) not found!\n", prop);
 289                                 return 1;
 290                         }
 291                         if (len > SCRATCHPAD) {
 292                                 printf("prop (%d) doesn't fit in scratchpad!\n",
 293                                        len);
 294                                 return 1;
 295                         }
 296                         memcpy(data, ptmp, len);
 297                         ret = fdt_parse_prop(&argv[4], argc - 4, data, &len);
 298                         if (ret != 0)
 299                                 return ret;
 300                 }
 301
 302                 ret = fdt_setprop(working_fdt, nodeoffset, prop, data, len);
 303                 if (ret < 0) {
 304                         printf ("libfdt fdt_setprop(): %s\n", fdt_strerror(ret));
 305                         return 1;
 306                 }
 307
 308         /********************************************************************
 309          * Get the value of a property in the working_fdt.
 310          ********************************************************************/
 311         } else if (argv[1][0] == 'g') {
 312                 char *subcmd;           /* sub-command */
 313                 char *pathp;            /* path */
 314                 char *prop;             /* property */
 315                 char *var;              /* variable to store result */
 316                 int  nodeoffset;        /* node offset from libfdt */
 317                 const void *nodep;      /* property node pointer */
 318                 int  len = 0;           /* new length of the property */
 319
 320                 /*
 321                  * Parameters: Node path, property, optional value.
 322                  */
 323                 if (argc < 5)
 324                         return CMD_RET_USAGE;
 325
 326                 subcmd = argv[2];
 327
 328                 if (argc < 6 && subcmd[0] != 's')
 329                         return CMD_RET_USAGE;
 330
 331                 var    = argv[3];
 332                 pathp  = argv[4];
 333                 prop   = argv[5];
 334
 335                 nodeoffset = fdt_path_offset(working_fdt, pathp);
 336                 if (nodeoffset < 0) {
 337                         /*
 338                          * Not found or something else bad happened.
 339                          */
 340                         printf("libfdt fdt_path_offset() returned %s\n",
 341                                 fdt_strerror(nodeoffset));
 342                         return 1;
 343                 }
 344
 345                 if (subcmd[0] == 'n' || (subcmd[0] == 's' && argc == 5)) {
 346                         int reqIndex = -1;
 347                         int startDepth = fdt_node_depth(
 348                                 working_fdt, nodeoffset);
 349                         int curDepth = startDepth;
 350                         int curIndex = -1;
 351                         int nextNodeOffset = fdt_next_node(
 352                                 working_fdt, nodeoffset, &curDepth);
 353
 354                         if (subcmd[0] == 'n')
 355                                 reqIndex = simple_strtoul(argv[5], NULL, 16);
 356
 357                         while (curDepth > startDepth) {
 358                                 if (curDepth == startDepth + 1)
 359                                         curIndex++;
 360                                 if (subcmd[0] == 'n' && curIndex == reqIndex) {
 361                                         const char *nodeName = fdt_get_name(
 362                                             working_fdt, nextNodeOffset, NULL);
 363
 364                                         setenv(var, (char *)nodeName);
 365                                         return 0;
 366                                 }
 367                                 nextNodeOffset = fdt_next_node(
 368                                         working_fdt, nextNodeOffset, &curDepth);
 369                                 if (nextNodeOffset < 0)
 370                                         break;
 371                         }
 372                         if (subcmd[0] == 's') {
 373                                 /* get the num nodes at this level */
 374                                 setenv_ulong(var, curIndex + 1);
 375                         } else {
 376                                 /* node index not found */
 377                                 printf("libfdt node not found\n");
 378                                 return 1;
 379                         }
 380                 } else {
 381                         nodep = fdt_getprop(
 382                                 working_fdt, nodeoffset, prop, &len);
 383                         if (len == 0) {
 384                                 /* no property value */
 385                                 setenv(var, "");
 386                                 return 0;
 387                         } else if (nodep && len > 0) {
 388                                 if (subcmd[0] == 'v') {
 389                                         int ret;
 390
 391                                         ret = fdt_value_setenv(nodep, len, var);
 392                                         if (ret != 0)
 393                                                 return ret;
 394                                 } else if (subcmd[0] == 'a') {
 395                                         /* Get address */
 396                                         char buf[11];
 397
 398                                         sprintf(buf, "0x%p", nodep);
 399                                         setenv(var, buf);
 400                                 } else if (subcmd[0] == 's') {
 401                                         /* Get size */
 402                                         char buf[11];
 403
 404                                         sprintf(buf, "0x%08X", len);
 405                                         setenv(var, buf);
 406                                 } else
 407                                         return CMD_RET_USAGE;
 408                                 return 0;
 409                         } else {
 410                                 printf("libfdt fdt_getprop(): %s\n",
 411                                         fdt_strerror(len));
 412                                 return 1;
 413                         }
 414                 }
 415
 416         /*
 417          * Print (recursive) / List (single level)
 418          */
 419         } else if ((argv[1][0] == 'p') || (argv[1][0] == 'l')) {
 420                 int depth = MAX_LEVEL;  /* how deep to print */
 421                 char *pathp;            /* path */
 422                 char *prop;             /* property */
 423                 int  ret;               /* return value */
 424                 static char root[2] = "/";
 425
 426                 /*
 427                  * list is an alias for print, but limited to 1 level
 428                  */
 429                 if (argv[1][0] == 'l') {
 430                         depth = 1;
 431                 }
 432
 433                 /*
 434                  * Get the starting path.  The root node is an oddball,
 435                  * the offset is zero and has no name.
 436                  */
 437                 if (argc == 2)
 438                         pathp = root;
 439                 else
 440                         pathp = argv[2];
 441                 if (argc > 3)
 442                         prop = argv[3];
 443                 else
 444                         prop = NULL;
 445
 446                 ret = fdt_print(pathp, prop, depth);
 447                 if (ret != 0)
 448                         return ret;
 449
 450         /*
 451          * Remove a property/node
 452          */
 453         } else if (strncmp(argv[1], "rm", 2) == 0) {
 454                 int  nodeoffset;        /* node offset from libfdt */
 455                 int  err;
 456
 457                 /*
 458                  * Get the path.  The root node is an oddball, the offset
 459                  * is zero and has no name.
 460                  */
 461                 nodeoffset = fdt_path_offset (working_fdt, argv[2]);
 462                 if (nodeoffset < 0) {
 463                         /*
 464                          * Not found or something else bad happened.
 465                          */
 466                         printf ("libfdt fdt_path_offset() returned %s\n",
 467                                 fdt_strerror(nodeoffset));
 468                         return 1;
 469                 }
 470                 /*
 471                  * Do the delete.  A fourth parameter means delete a property,
 472                  * otherwise delete the node.
 473                  */
 474                 if (argc > 3) {
 475                         err = fdt_delprop(working_fdt, nodeoffset, argv[3]);
 476                         if (err < 0) {
 477                                 printf("libfdt fdt_delprop():  %s\n",
 478                                         fdt_strerror(err));
 479                                 return err;
 480                         }
 481                 } else {
 482                         err = fdt_del_node(working_fdt, nodeoffset);
 483                         if (err < 0) {
 484                                 printf("libfdt fdt_del_node():  %s\n",
 485                                         fdt_strerror(err));
 486                                 return err;
 487                         }
 488                 }
 489
 490         /*
 491          * Display header info
 492          */
 493         } else if (argv[1][0] == 'h') {
 494                 u32 version = fdt_version(working_fdt);
 495                 printf("magic:\t\t\t0x%x\n", fdt_magic(working_fdt));
 496                 printf("totalsize:\t\t0x%x (%d)\n", fdt_totalsize(working_fdt),
 497                        fdt_totalsize(working_fdt));
 498                 printf("off_dt_struct:\t\t0x%x\n",
 499                        fdt_off_dt_struct(working_fdt));
 500                 printf("off_dt_strings:\t\t0x%x\n",
 501                        fdt_off_dt_strings(working_fdt));
 502                 printf("off_mem_rsvmap:\t\t0x%x\n",
 503                        fdt_off_mem_rsvmap(working_fdt));
 504                 printf("version:\t\t%d\n", version);
 505                 printf("last_comp_version:\t%d\n",
 506                        fdt_last_comp_version(working_fdt));
 507                 if (version >= 2)
 508                         printf("boot_cpuid_phys:\t0x%x\n",
 509                                 fdt_boot_cpuid_phys(working_fdt));
 510                 if (version >= 3)
 511                         printf("size_dt_strings:\t0x%x\n",
 512                                 fdt_size_dt_strings(working_fdt));
 513                 if (version >= 17)
 514                         printf("size_dt_struct:\t\t0x%x\n",
 515                                 fdt_size_dt_struct(working_fdt));
 516                 printf("number mem_rsv:\t\t0x%x\n",
 517                        fdt_num_mem_rsv(working_fdt));
 518                 printf("\n");
 519
 520         /*
 521          * Set boot cpu id
 522          */
 523         } else if (strncmp(argv[1], "boo", 3) == 0) {
 524                 unsigned long tmp = simple_strtoul(argv[2], NULL, 16);
 525                 fdt_set_boot_cpuid_phys(working_fdt, tmp);
 526
 527         /*
 528          * memory command
 529          */
 530         } else if (strncmp(argv[1], "me", 2) == 0) {
 531                 uint64_t addr, size;
 532                 int err;
 533                 addr = simple_strtoull(argv[2], NULL, 16);
 534                 size = simple_strtoull(argv[3], NULL, 16);
 535                 err = fdt_fixup_memory(working_fdt, addr, size);
 536                 if (err < 0)
 537                         return err;
 538
 539         /*
 540          * mem reserve commands
 541          */
 542         } else if (strncmp(argv[1], "rs", 2) == 0) {
 543                 if (argv[2][0] == 'p') {
 544                         uint64_t addr, size;
 545                         int total = fdt_num_mem_rsv(working_fdt);
 546                         int j, err;
 547                         printf("index\t\t   start\t\t    size\n");
 548                         printf("-------------------------------"
 549                                 "-----------------\n");
 550                         for (j = 0; j < total; j++) {
 551                                 err = fdt_get_mem_rsv(working_fdt, j, &addr, &size);
 552                                 if (err < 0) {
 553                                         printf("libfdt fdt_get_mem_rsv():  %s\n",
 554                                                         fdt_strerror(err));
 555                                         return err;
 556                                 }
 557                                 printf("    %x\t%08x%08x\t%08x%08x\n", j,
 558                                         (u32)(addr >> 32),
 559                                         (u32)(addr & 0xffffffff),
 560                                         (u32)(size >> 32),
 561                                         (u32)(size & 0xffffffff));
 562                         }
 563                 } else if (argv[2][0] == 'a') {
 564                         uint64_t addr, size;
 565                         int err;
 566                         addr = simple_strtoull(argv[3], NULL, 16);
 567                         size = simple_strtoull(argv[4], NULL, 16);
 568                         err = fdt_add_mem_rsv(working_fdt, addr, size);
 569
 570                         if (err < 0) {
 571                                 printf("libfdt fdt_add_mem_rsv():  %s\n",
 572                                         fdt_strerror(err));
 573                                 return err;
 574                         }
 575                 } else if (argv[2][0] == 'd') {
 576                         unsigned long idx = simple_strtoul(argv[3], NULL, 16);
 577                         int err = fdt_del_mem_rsv(working_fdt, idx);
 578
 579                         if (err < 0) {
 580                                 printf("libfdt fdt_del_mem_rsv():  %s\n",
 581                                         fdt_strerror(err));
 582                                 return err;
 583                         }
 584                 } else {
 585                         /* Unrecognized command */
 586                         return CMD_RET_USAGE;
 587                 }
 588         }
 589 #ifdef CONFIG_OF_BOARD_SETUP
 590         /* Call the board-specific fixup routine */
 591         else if (strncmp(argv[1], "boa", 3) == 0) {
 592                 int err = ft_board_setup(working_fdt, gd->bd);
 593
 594                 if (err) {
 595                         printf("Failed to update board information in FDT: %s\n",
 596                                fdt_strerror(err));
 597                         return CMD_RET_FAILURE;
 598                 }
 599         }
 600 #endif
 601         /* Create a chosen node */
 602         else if (strncmp(argv[1], "cho", 3) == 0) {
 603                 unsigned long initrd_start = 0, initrd_end = 0;
 604
 605                 if ((argc != 2) && (argc != 4))
 606                         return CMD_RET_USAGE;
 607
 608                 if (argc == 4) {
 609                         initrd_start = simple_strtoul(argv[2], NULL, 16);
 610                         initrd_end = simple_strtoul(argv[3], NULL, 16);
 611                 }
 612
 613                 fdt_chosen(working_fdt);
 614                 fdt_initrd(working_fdt, initrd_start, initrd_end);
 615
 616 #if defined(CONFIG_FIT_SIGNATURE)
 617         } else if (strncmp(argv[1], "che", 3) == 0) {
 618                 int cfg_noffset;
 619                 int ret;
 620                 unsigned long addr;
 621                 struct fdt_header *blob;
 622
 623                 if (!working_fdt)
 624                         return CMD_RET_FAILURE;
 625
 626                 if (argc > 2) {
 627                         addr = simple_strtoul(argv[2], NULL, 16);
 628                         blob = map_sysmem(addr, 0);
 629                 } else {
 630                         blob = (struct fdt_header *)gd->fdt_blob;
 631                 }
 632                 if (!fdt_valid(&blob))
 633                         return 1;
 634
 635                 gd->fdt_blob = blob;
 636                 cfg_noffset = fit_conf_get_node(working_fdt, NULL);
 637                 if (!cfg_noffset) {
 638                         printf("Could not find configuration node: %s\n",
 639                                fdt_strerror(cfg_noffset));
 640                         return CMD_RET_FAILURE;
 641                 }
 642
 643                 ret = fit_config_verify(working_fdt, cfg_noffset);
 644                 if (ret == 0)
 645                         return CMD_RET_SUCCESS;
 646                 else
 647                         return CMD_RET_FAILURE;
 648 #endif
 649
 650         }
 651 #ifdef CONFIG_OF_LIBFDT_OVERLAY
 652         /* apply an overlay */
 653         else if (strncmp(argv[1], "ap", 2) == 0) {
 654                 unsigned long addr;
 655                 struct fdt_header *blob;
 656                 int ret;
 657
 658                 if (argc != 3)
 659                         return CMD_RET_USAGE;
 660
 661                 if (!working_fdt)
 662                         return CMD_RET_FAILURE;
 663
 664                 addr = simple_strtoul(argv[2], NULL, 16);
 665                 blob = map_sysmem(addr, 0);
 666                 if (!fdt_valid(&blob))
 667                         return CMD_RET_FAILURE;
 668
 669                 ret = fdt_overlay_apply(working_fdt, blob);
 670                 if (ret) {
 671                         printf("fdt_overlay_apply(): %s\n", fdt_strerror(ret));
 672                         return CMD_RET_FAILURE;
 673                 }
 674         }
 675 #endif
 676         /* resize the fdt */
 677         else if (strncmp(argv[1], "re", 2) == 0) {
 678                 uint extrasize;
 679                 if (argc > 2)
 680                         extrasize = simple_strtoul(argv[2], NULL, 16);
 681                 else
 682                         extrasize = 0;
 683                 fdt_shrink_to_minimum(working_fdt, extrasize);
 684         }
 685         else {
 686                 /* Unrecognized command */
 687                 return CMD_RET_USAGE;
 688         }
 689
 690         return 0;
 691 }
 692
 693 /****************************************************************************/
 694
 695 /**
 696  * fdt_valid() - Check if an FDT is valid. If not, change it to NULL
 697  *
 698  * @blobp: Pointer to FDT pointer
 699  * @return 1 if OK, 0 if bad (in which case *blobp is set to NULL)
 700  */
 701 static int fdt_valid(struct fdt_header **blobp)
 702 {
 703         const void *blob = *blobp;
 704         int err;
 705
 706         if (blob == NULL) {
 707                 printf ("The address of the fdt is invalid (NULL).\n");
 708                 return 0;
 709         }
 710
 711         err = fdt_check_header(blob);
 712         if (err == 0)
 713                 return 1;       /* valid */
 714
 715         if (err < 0) {
 716                 printf("libfdt fdt_check_header(): %s", fdt_strerror(err));
 717                 /*
 718                  * Be more informative on bad version.
 719                  */
 720                 if (err == -FDT_ERR_BADVERSION) {
 721                         if (fdt_version(blob) <
 722                             FDT_FIRST_SUPPORTED_VERSION) {
 723                                 printf (" - too old, fdt %d < %d",
 724                                         fdt_version(blob),
 725                                         FDT_FIRST_SUPPORTED_VERSION);
 726                         }
 727                         if (fdt_last_comp_version(blob) >
 728                             FDT_LAST_SUPPORTED_VERSION) {
 729                                 printf (" - too new, fdt %d > %d",
 730                                         fdt_version(blob),
 731                                         FDT_LAST_SUPPORTED_VERSION);
 732                         }
 733                 }
 734                 printf("\n");
 735                 *blobp = NULL;
 736                 return 0;
 737         }
 738         return 1;
 739 }
 740
 741 /****************************************************************************/
 742
 743 /*
 744  * Parse the user's input, partially heuristic.  Valid formats:
 745  * <0x00112233 4 05>    - an array of cells.  Numbers follow standard
 746  *                      C conventions.
 747  * [00 11 22 .. nn] - byte stream
 748  * "string"     - If the the value doesn't start with "<" or "[", it is
 749  *                      treated as a string.  Note that the quotes are
 750  *                      stripped by the parser before we get the string.
 751  * newval: An array of strings containing the new property as specified
 752  *      on the command line
 753  * count: The number of strings in the array
 754  * data: A bytestream to be placed in the property
 755  * len: The length of the resulting bytestream
 756  */
 757 static int fdt_parse_prop(char * const *newval, int count, char *data, int *len)
 758 {
 759         char *cp;               /* temporary char pointer */
 760         char *newp;             /* temporary newval char pointer */
 761         unsigned long tmp;      /* holds converted values */
 762         int stridx = 0;
 763
 764         *len = 0;
 765         newp = newval[0];
 766
 767         /* An array of cells */
 768         if (*newp == '<') {
 769                 newp++;
 770                 while ((*newp != '>') && (stridx < count)) {
 771                         /*
 772                          * Keep searching until we find that last ">"
 773                          * That way users don't have to escape the spaces
 774                          */
 775                         if (*newp == '\0') {
 776                                 newp = newval[++stridx];
 777                                 continue;
 778                         }
 779
 780                         cp = newp;
 781                         tmp = simple_strtoul(cp, &newp, 0);
 782                         if (*cp != '?')
 783                                 *(fdt32_t *)data = cpu_to_fdt32(tmp);
 784                         else
 785                                 newp++;
 786
 787                         data  += 4;
 788                         *len += 4;
 789
 790                         /* If the ptr didn't advance, something went wrong */
 791                         if ((newp - cp) <= 0) {
 792                                 printf("Sorry, I could not convert \"%s\"\n",
 793                                         cp);
 794                                 return 1;
 795                         }
 796
 797                         while (*newp == ' ')
 798                                 newp++;
 799                 }
 800
 801                 if (*newp != '>') {
 802                         printf("Unexpected character '%c'\n", *newp);
 803                         return 1;
 804                 }
 805         } else if (*newp == '[') {
 806                 /*
 807                  * Byte stream.  Convert the values.
 808                  */
 809                 newp++;
 810                 while ((stridx < count) && (*newp != ']')) {
 811                         while (*newp == ' ')
 812                                 newp++;
 813                         if (*newp == '\0') {
 814                                 newp = newval[++stridx];
 815                                 continue;
 816                         }
 817                         if (!isxdigit(*newp))
 818                                 break;
 819                         tmp = simple_strtoul(newp, &newp, 16);
 820                         *data++ = tmp & 0xFF;
 821                         *len    = *len + 1;
 822                 }
 823                 if (*newp != ']') {
 824                         printf("Unexpected character '%c'\n", *newp);
 825                         return 1;
 826                 }
 827         } else {
 828                 /*
 829                  * Assume it is one or more strings.  Copy it into our
 830                  * data area for convenience (including the
 831                  * terminating '\0's).
 832                  */
 833                 while (stridx < count) {
 834                         size_t length = strlen(newp) + 1;
 835                         strcpy(data, newp);
 836                         data += length;
 837                         *len += length;
 838                         newp = newval[++stridx];
 839                 }
 840         }
 841         return 0;
 842 }
 843
 844 /****************************************************************************/
 845
 846 /*
 847  * Heuristic to guess if this is a string or concatenated strings.
 848  */
 849
 850 static int is_printable_string(const void *data, int len)
 851 {
 852         const char *s = data;
 853
 854         /* zero length is not */
 855         if (len == 0)
 856                 return 0;
 857
 858         /* must terminate with zero or '\n' */
 859         if (s[len - 1] != '\0' && s[len - 1] != '\n')
 860                 return 0;
 861
 862         /* printable or a null byte (concatenated strings) */
 863         while (((*s == '\0') || isprint(*s) || isspace(*s)) && (len > 0)) {
 864                 /*
 865                  * If we see a null, there are three possibilities:
 866                  * 1) If len == 1, it is the end of the string, printable
 867                  * 2) Next character also a null, not printable.
 868                  * 3) Next character not a null, continue to check.
 869                  */
 870                 if (s[0] == '\0') {
 871                         if (len == 1)
 872                                 return 1;
 873                         if (s[1] == '\0')
 874                                 return 0;
 875                 }
 876                 s++;
 877                 len--;
 878         }
 879
 880         /* Not the null termination, or not done yet: not printable */
 881         if (*s != '\0' || (len != 0))
 882                 return 0;
 883
 884         return 1;
 885 }
 886
 887
 888 /*
 889  * Print the property in the best format, a heuristic guess.  Print as
 890  * a string, concatenated strings, a byte, word, double word, or (if all
 891  * else fails) it is printed as a stream of bytes.
 892  */
 893 static void print_data(const void *data, int len)
 894 {
 895         int j;
 896
 897         /* no data, don't print */
 898         if (len == 0)
 899                 return;
 900
 901         /*
 902          * It is a string, but it may have multiple strings (embedded '\0's).
 903          */
 904         if (is_printable_string(data, len)) {
 905                 puts("\"");
 906                 j = 0;
 907                 while (j < len) {
 908                         if (j > 0)
 909                                 puts("\", \"");
 910                         puts(data);
 911                         j    += strlen(data) + 1;
 912                         data += strlen(data) + 1;
 913                 }
 914                 puts("\"");
 915                 return;
 916         }
 917
 918         if ((len %4) == 0) {
 919                 if (len > CMD_FDT_MAX_DUMP)
 920                         printf("* 0x%p [0x%08x]", data, len);
 921                 else {
 922                         const __be32 *p;
 923
 924                         printf("<");
 925                         for (j = 0, p = data; j < len/4; j++)
 926                                 printf("0x%08x%s", fdt32_to_cpu(p[j]),
 927                                         j < (len/4 - 1) ? " " : "");
 928                         printf(">");
 929                 }
 930         } else { /* anything else... hexdump */
 931                 if (len > CMD_FDT_MAX_DUMP)
 932                         printf("* 0x%p [0x%08x]", data, len);
 933                 else {
 934                         const u8 *s;
 935
 936                         printf("[");
 937                         for (j = 0, s = data; j < len; j++)
 938                                 printf("%02x%s", s[j], j < len - 1 ? " " : "");
 939                         printf("]");
 940                 }
 941         }
 942 }
 943
 944 /****************************************************************************/
 945
 946 /*
 947  * Recursively print (a portion of) the working_fdt.  The depth parameter
 948  * determines how deeply nested the fdt is printed.
 949  */
 950 static int fdt_print(const char *pathp, char *prop, int depth)
 951 {
 952         static char tabs[MAX_LEVEL+1] =
 953                 "\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t"
 954                 "\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t";
 955         const void *nodep;      /* property node pointer */
 956         int  nodeoffset;        /* node offset from libfdt */
 957         int  nextoffset;        /* next node offset from libfdt */
 958         uint32_t tag;           /* tag */
 959         int  len;               /* length of the property */
 960         int  level = 0;         /* keep track of nesting level */
 961         const struct fdt_property *fdt_prop;
 962
 963         nodeoffset = fdt_path_offset (working_fdt, pathp);
 964         if (nodeoffset < 0) {
 965                 /*
 966                  * Not found or something else bad happened.
 967                  */
 968                 printf ("libfdt fdt_path_offset() returned %s\n",
 969                         fdt_strerror(nodeoffset));
 970                 return 1;
 971         }
 972         /*
 973          * The user passed in a property as well as node path.
 974          * Print only the given property and then return.
 975          */
 976         if (prop) {
 977                 nodep = fdt_getprop (working_fdt, nodeoffset, prop, &len);
 978                 if (len == 0) {
 979                         /* no property value */
 980                         printf("%s %s\n", pathp, prop);
 981                         return 0;
 982                 } else if (nodep && len > 0) {
 983                         printf("%s = ", prop);
 984                         print_data (nodep, len);
 985                         printf("\n");
 986                         return 0;
 987                 } else {
 988                         printf ("libfdt fdt_getprop(): %s\n",
 989                                 fdt_strerror(len));
 990                         return 1;
 991                 }
 992         }
 993
 994         /*
 995          * The user passed in a node path and no property,
 996          * print the node and all subnodes.
 997          */
 998         while(level >= 0) {
 999                 tag = fdt_next_tag(working_fdt, nodeoffset, &nextoffset);
1000                 switch(tag) {
1001                 case FDT_BEGIN_NODE:
1002                         pathp = fdt_get_name(working_fdt, nodeoffset, NULL);
1003                         if (level <= depth) {
1004                                 if (pathp == NULL)
1005                                         pathp = "/* NULL pointer error */";
1006                                 if (*pathp == '\0')
1007                                         pathp = "/";    /* root is nameless */
1008                                 printf("%s%s {\n",
1009                                         &tabs[MAX_LEVEL - level], pathp);
1010                         }
1011                         level++;
1012                         if (level >= MAX_LEVEL) {
1013                                 printf("Nested too deep, aborting.\n");
1014                                 return 1;
1015                         }
1016                         break;
1017                 case FDT_END_NODE:
1018                         level--;
1019                         if (level <= depth)
1020                                 printf("%s};\n", &tabs[MAX_LEVEL - level]);
1021                         if (level == 0) {
1022                                 level = -1;             /* exit the loop */
1023                         }
1024                         break;
1025                 case FDT_PROP:
1026                         fdt_prop = fdt_offset_ptr(working_fdt, nodeoffset,
1027                                         sizeof(*fdt_prop));
1028                         pathp    = fdt_string(working_fdt,
1029                                         fdt32_to_cpu(fdt_prop->nameoff));
1030                         len      = fdt32_to_cpu(fdt_prop->len);
1031                         nodep    = fdt_prop->data;
1032                         if (len < 0) {
1033                                 printf ("libfdt fdt_getprop(): %s\n",
1034                                         fdt_strerror(len));
1035                                 return 1;
1036                         } else if (len == 0) {
1037                                 /* the property has no value */
1038                                 if (level <= depth)
1039                                         printf("%s%s;\n",
1040                                                 &tabs[MAX_LEVEL - level],
1041                                                 pathp);
1042                         } else {
1043                                 if (level <= depth) {
1044                                         printf("%s%s = ",
1045                                                 &tabs[MAX_LEVEL - level],
1046                                                 pathp);
1047                                         print_data (nodep, len);
1048                                         printf(";\n");
1049                                 }
1050                         }
1051                         break;
1052                 case FDT_NOP:
1053                         printf("%s/* NOP */\n", &tabs[MAX_LEVEL - level]);
1054                         break;
1055                 case FDT_END:
1056                         return 1;
1057                 default:
1058                         if (level <= depth)
1059                                 printf("Unknown tag 0x%08X\n", tag);
1060                         return 1;
1061                 }
1062                 nodeoffset = nextoffset;
1063         }
1064         return 0;
1065 }
1066
1067 /********************************************************************/
1068 #ifdef CONFIG_SYS_LONGHELP
1069 static char fdt_help_text[] =
1070         "addr [-c]  <addr> [<length>]   - Set the [control] fdt location to <addr>\n"
1071 #ifdef CONFIG_OF_LIBFDT_OVERLAY
1072         "fdt apply <addr>                    - Apply overlay to the DT\n"
1073 #endif
1074 #ifdef CONFIG_OF_BOARD_SETUP
1075         "fdt boardsetup                      - Do board-specific set up\n"
1076 #endif
1077 #ifdef CONFIG_OF_SYSTEM_SETUP
1078         "fdt systemsetup                     - Do system-specific set up\n"
1079 #endif
1080         "fdt move   <fdt> <newaddr> <length> - Copy the fdt to <addr> and make it active\n"
1081         "fdt resize [<extrasize>]            - Resize fdt to size + padding to 4k addr + some optional <extrasize> if needed\n"
1082         "fdt print  <path> [<prop>]          - Recursive print starting at <path>\n"
1083         "fdt list   <path> [<prop>]          - Print one level starting at <path>\n"
1084         "fdt get value <var> <path> <prop>   - Get <property> and store in <var>\n"
1085         "fdt get name <var> <path> <index>   - Get name of node <index> and store in <var>\n"
1086         "fdt get addr <var> <path> <prop>    - Get start address of <property> and store in <var>\n"
1087         "fdt get size <var> <path> [<prop>]  - Get size of [<property>] or num nodes and store in <var>\n"
1088         "fdt set    <path> <prop> [<val>]    - Set <property> [to <val>]\n"
1089         "fdt mknode <path> <node>            - Create a new node after <path>\n"
1090         "fdt rm     <path> [<prop>]          - Delete the node or <property>\n"
1091         "fdt header                          - Display header info\n"
1092         "fdt bootcpu <id>                    - Set boot cpuid\n"
1093         "fdt memory <addr> <size>            - Add/Update memory node\n"
1094         "fdt rsvmem print                    - Show current mem reserves\n"
1095         "fdt rsvmem add <addr> <size>        - Add a mem reserve\n"
1096         "fdt rsvmem delete <index>           - Delete a mem reserves\n"
1097         "fdt chosen [<start> <end>]          - Add/update the /chosen branch in the tree\n"
1098         "                                        <start>/<end> - initrd start/end addr\n"
1099 #if defined(CONFIG_FIT_SIGNATURE)
1100         "fdt checksign [<addr>]              - check FIT signature\n"
1101         "                                        <start> - addr of key blob\n"
1102         "                                                  default gd->fdt_blob\n"
1103 #endif
1104         "NOTE: Dereference aliases by omitting the leading '/', "
1105                 "e.g. fdt print ethernet0.";
1106 #endif
1107
1108 U_BOOT_CMD(
1109         fdt,    255,    0,      do_fdt,
1110         "flattened device tree utility commands", fdt_help_text
1111 );