common/cmd_fdt.c

   1 /*
   2  * (C) Copyright 2007
   3  * Gerald Van Baren, Custom IDEAS, vanbaren@cideas.com
   4  * Based on code written by:
   5  *   Pantelis Antoniou <pantelis.antoniou@gmail.com> and
   6  *   Matthew McClintock <msm@freescale.com>
   7  *
   8  * See file CREDITS for list of people who contributed to this
   9  * project.
  10  *
  11  * This program is free software; you can redistribute it and/or
  12  * modify it under the terms of the GNU General Public License as
  13  * published by the Free Software Foundation; either version 2 of
  14  * the License, or (at your option) any later version.
  15  *
  16  * This program is distributed in the hope that it will be useful,
  17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19  * GNU General Public License for more details.
  20  *
  21  * You should have received a copy of the GNU General Public License
  22  * along with this program; if not, write to the Free Software
  23  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  24  * MA 02111-1307 USA
  25  */
  26
  27 #include <common.h>
  28 #include <command.h>
  29 #include <linux/ctype.h>
  30 #include <linux/types.h>
  31 #include <asm/global_data.h>
  32 #include <libfdt.h>
  33 #include <fdt_support.h>
  34
  35 #define MAX_LEVEL       32              /* how deeply nested we will go */
  36 #define SCRATCHPAD      1024            /* bytes of scratchpad memory */
  37 #ifndef CONFIG_CMD_FDT_MAX_DUMP
  38 #define CONFIG_CMD_FDT_MAX_DUMP 64
  39 #endif
  40
  41 /*
  42  * Global data (for the gd->bd)
  43  */
  44 DECLARE_GLOBAL_DATA_PTR;
  45
  46 static int fdt_valid(struct fdt_header **blobp);
  47 static int fdt_parse_prop(char *const*newval, int count, char *data, int *len);
  48 static int fdt_print(const char *pathp, char *prop, int depth);
  49 static int is_printable_string(const void *data, int len);
  50
  51 /*
  52  * The working_fdt points to our working flattened device tree.
  53  */
  54 struct fdt_header *working_fdt;
  55
  56 void set_working_fdt_addr(void *addr)
  57 {
  58         working_fdt = addr;
  59         setenv_addr("fdtaddr", addr);
  60 }
  61
  62 /*
  63  * Get a value from the fdt and format it to be set in the environment
  64  */
  65 static int fdt_value_setenv(const void *nodep, int len, const char *var)
  66 {
  67         if (is_printable_string(nodep, len))
  68                 setenv(var, (void *)nodep);
  69         else if (len == 4) {
  70                 char buf[11];
  71
  72                 sprintf(buf, "0x%08X", *(uint32_t *)nodep);
  73                 setenv(var, buf);
  74         } else if (len%4 == 0 && len <= 20) {
  75                 /* Needed to print things like sha1 hashes. */
  76                 char buf[41];
  77                 int i;
  78
  79                 for (i = 0; i < len; i += sizeof(unsigned int))
  80                         sprintf(buf + (i * 2), "%08x",
  81                                 *(unsigned int *)(nodep + i));
  82                 setenv(var, buf);
  83         } else {
  84                 printf("error: unprintable value\n");
  85                 return 1;
  86         }
  87         return 0;
  88 }
  89
  90 /*
  91  * Flattened Device Tree command, see the help for parameter definitions.
  92  */
  93 static int do_fdt(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
  94 {
  95         if (argc < 2)
  96                 return CMD_RET_USAGE;
  97
  98         /*
  99          * Set the address of the fdt
 100          */
 101         if (argv[1][0] == 'a') {
 102                 unsigned long addr;
 103                 int control = 0;
 104                 struct fdt_header *blob;
 105                 /*
 106                  * Set the address [and length] of the fdt.
 107                  */
 108                 argc -= 2;
 109                 argv += 2;
 110 /* Temporary #ifdef - some archs don't have fdt_blob yet */
 111 #ifdef CONFIG_OF_CONTROL
 112                 if (argc && !strcmp(*argv, "-c")) {
 113                         control = 1;
 114                         argc--;
 115                         argv++;
 116                 }
 117 #endif
 118                 if (argc == 0) {
 119                         if (control)
 120                                 blob = (struct fdt_header *)gd->fdt_blob;
 121                         else
 122                                 blob = working_fdt;
 123                         if (!blob || !fdt_valid(&blob))
 124                                 return 1;
 125                         printf("The address of the fdt is %#08lx\n",
 126                                control ? (ulong)blob :
 127                                         getenv_hex("fdtaddr", 0));
 128                         return 0;
 129                 }
 130
 131                 addr = simple_strtoul(argv[0], NULL, 16);
 132                 blob = (struct fdt_header *)addr;
 133                 if (!fdt_valid(&blob))
 134                         return 1;
 135                 if (control)
 136                         gd->fdt_blob = blob;
 137                 else
 138                         set_working_fdt_addr((void *)addr);
 139
 140                 if (argc >= 2) {
 141                         int  len;
 142                         int  err;
 143                         /*
 144                          * Optional new length
 145                          */
 146                         len = simple_strtoul(argv[1], NULL, 16);
 147                         if (len < fdt_totalsize(blob)) {
 148                                 printf ("New length %d < existing length %d, "
 149                                         "ignoring.\n",
 150                                         len, fdt_totalsize(blob));
 151                         } else {
 152                                 /*
 153                                  * Open in place with a new length.
 154                                  */
 155                                 err = fdt_open_into(blob, blob, len);
 156                                 if (err != 0) {
 157                                         printf ("libfdt fdt_open_into(): %s\n",
 158                                                 fdt_strerror(err));
 159                                 }
 160                         }
 161                 }
 162
 163                 return CMD_RET_SUCCESS;
 164         }
 165
 166         if (!working_fdt) {
 167                 puts(
 168                         "No FDT memory address configured. Please configure\n"
 169                         "the FDT address via \"fdt addr <address>\" command.\n"
 170                         "Aborting!\n");
 171                 return CMD_RET_FAILURE;
 172         }
 173
 174         /*
 175          * Move the working_fdt
 176          */
 177         if (strncmp(argv[1], "mo", 2) == 0) {
 178                 struct fdt_header *newaddr;
 179                 int  len;
 180                 int  err;
 181
 182                 if (argc < 4)
 183                         return CMD_RET_USAGE;
 184
 185                 /*
 186                  * Set the address and length of the fdt.
 187                  */
 188                 working_fdt = (struct fdt_header *)simple_strtoul(argv[2], NULL, 16);
 189                 if (!fdt_valid(&working_fdt))
 190                         return 1;
 191
 192                 newaddr = (struct fdt_header *)simple_strtoul(argv[3],NULL,16);
 193
 194                 /*
 195                  * If the user specifies a length, use that.  Otherwise use the
 196                  * current length.
 197                  */
 198                 if (argc <= 4) {
 199                         len = fdt_totalsize(working_fdt);
 200                 } else {
 201                         len = simple_strtoul(argv[4], NULL, 16);
 202                         if (len < fdt_totalsize(working_fdt)) {
 203                                 printf ("New length 0x%X < existing length "
 204                                         "0x%X, aborting.\n",
 205                                         len, fdt_totalsize(working_fdt));
 206                                 return 1;
 207                         }
 208                 }
 209
 210                 /*
 211                  * Copy to the new location.
 212                  */
 213                 err = fdt_open_into(working_fdt, newaddr, len);
 214                 if (err != 0) {
 215                         printf ("libfdt fdt_open_into(): %s\n",
 216                                 fdt_strerror(err));
 217                         return 1;
 218                 }
 219                 working_fdt = newaddr;
 220
 221         /*
 222          * Make a new node
 223          */
 224         } else if (strncmp(argv[1], "mk", 2) == 0) {
 225                 char *pathp;            /* path */
 226                 char *nodep;            /* new node to add */
 227                 int  nodeoffset;        /* node offset from libfdt */
 228                 int  err;
 229
 230                 /*
 231                  * Parameters: Node path, new node to be appended to the path.
 232                  */
 233                 if (argc < 4)
 234                         return CMD_RET_USAGE;
 235
 236                 pathp = argv[2];
 237                 nodep = argv[3];
 238
 239                 nodeoffset = fdt_path_offset (working_fdt, pathp);
 240                 if (nodeoffset < 0) {
 241                         /*
 242                          * Not found or something else bad happened.
 243                          */
 244                         printf ("libfdt fdt_path_offset() returned %s\n",
 245                                 fdt_strerror(nodeoffset));
 246                         return 1;
 247                 }
 248                 err = fdt_add_subnode(working_fdt, nodeoffset, nodep);
 249                 if (err < 0) {
 250                         printf ("libfdt fdt_add_subnode(): %s\n",
 251                                 fdt_strerror(err));
 252                         return 1;
 253                 }
 254
 255         /*
 256          * Set the value of a property in the working_fdt.
 257          */
 258         } else if (argv[1][0] == 's') {
 259                 char *pathp;            /* path */
 260                 char *prop;             /* property */
 261                 int  nodeoffset;        /* node offset from libfdt */
 262                 static char data[SCRATCHPAD];   /* storage for the property */
 263                 int  len;               /* new length of the property */
 264                 int  ret;               /* return value */
 265
 266                 /*
 267                  * Parameters: Node path, property, optional value.
 268                  */
 269                 if (argc < 4)
 270                         return CMD_RET_USAGE;
 271
 272                 pathp  = argv[2];
 273                 prop   = argv[3];
 274                 if (argc == 4) {
 275                         len = 0;
 276                 } else {
 277                         ret = fdt_parse_prop(&argv[4], argc - 4, data, &len);
 278                         if (ret != 0)
 279                                 return ret;
 280                 }
 281
 282                 nodeoffset = fdt_path_offset (working_fdt, pathp);
 283                 if (nodeoffset < 0) {
 284                         /*
 285                          * Not found or something else bad happened.
 286                          */
 287                         printf ("libfdt fdt_path_offset() returned %s\n",
 288                                 fdt_strerror(nodeoffset));
 289                         return 1;
 290                 }
 291
 292                 ret = fdt_setprop(working_fdt, nodeoffset, prop, data, len);
 293                 if (ret < 0) {
 294                         printf ("libfdt fdt_setprop(): %s\n", fdt_strerror(ret));
 295                         return 1;
 296                 }
 297
 298         /********************************************************************
 299          * Get the value of a property in the working_fdt.
 300          ********************************************************************/
 301         } else if (argv[1][0] == 'g') {
 302                 char *subcmd;           /* sub-command */
 303                 char *pathp;            /* path */
 304                 char *prop;             /* property */
 305                 char *var;              /* variable to store result */
 306                 int  nodeoffset;        /* node offset from libfdt */
 307                 const void *nodep;      /* property node pointer */
 308                 int  len = 0;           /* new length of the property */
 309
 310                 /*
 311                  * Parameters: Node path, property, optional value.
 312                  */
 313                 if (argc < 5)
 314                         return CMD_RET_USAGE;
 315
 316                 subcmd = argv[2];
 317
 318                 if (argc < 6 && subcmd[0] != 's')
 319                         return CMD_RET_USAGE;
 320
 321                 var    = argv[3];
 322                 pathp  = argv[4];
 323                 prop   = argv[5];
 324
 325                 nodeoffset = fdt_path_offset(working_fdt, pathp);
 326                 if (nodeoffset < 0) {
 327                         /*
 328                          * Not found or something else bad happened.
 329                          */
 330                         printf("libfdt fdt_path_offset() returned %s\n",
 331                                 fdt_strerror(nodeoffset));
 332                         return 1;
 333                 }
 334
 335                 if (subcmd[0] == 'n' || (subcmd[0] == 's' && argc == 5)) {
 336                         int reqIndex = -1;
 337                         int startDepth = fdt_node_depth(
 338                                 working_fdt, nodeoffset);
 339                         int curDepth = startDepth;
 340                         int curIndex = -1;
 341                         int nextNodeOffset = fdt_next_node(
 342                                 working_fdt, nodeoffset, &curDepth);
 343
 344                         if (subcmd[0] == 'n')
 345                                 reqIndex = simple_strtoul(argv[5], NULL, 16);
 346
 347                         while (curDepth > startDepth) {
 348                                 if (curDepth == startDepth + 1)
 349                                         curIndex++;
 350                                 if (subcmd[0] == 'n' && curIndex == reqIndex) {
 351                                         const char *nodeName = fdt_get_name(
 352                                             working_fdt, nextNodeOffset, NULL);
 353
 354                                         setenv(var, (char *)nodeName);
 355                                         return 0;
 356                                 }
 357                                 nextNodeOffset = fdt_next_node(
 358                                         working_fdt, nextNodeOffset, &curDepth);
 359                                 if (nextNodeOffset < 0)
 360                                         break;
 361                         }
 362                         if (subcmd[0] == 's') {
 363                                 /* get the num nodes at this level */
 364                                 setenv_ulong(var, curIndex + 1);
 365                         } else {
 366                                 /* node index not found */
 367                                 printf("libfdt node not found\n");
 368                                 return 1;
 369                         }
 370                 } else {
 371                         nodep = fdt_getprop(
 372                                 working_fdt, nodeoffset, prop, &len);
 373                         if (len == 0) {
 374                                 /* no property value */
 375                                 setenv(var, "");
 376                                 return 0;
 377                         } else if (len > 0) {
 378                                 if (subcmd[0] == 'v') {
 379                                         int ret;
 380
 381                                         ret = fdt_value_setenv(nodep, len, var);
 382                                         if (ret != 0)
 383                                                 return ret;
 384                                 } else if (subcmd[0] == 'a') {
 385                                         /* Get address */
 386                                         char buf[11];
 387
 388                                         sprintf(buf, "0x%p", nodep);
 389                                         setenv(var, buf);
 390                                 } else if (subcmd[0] == 's') {
 391                                         /* Get size */
 392                                         char buf[11];
 393
 394                                         sprintf(buf, "0x%08X", len);
 395                                         setenv(var, buf);
 396                                 } else
 397                                         return CMD_RET_USAGE;
 398                                 return 0;
 399                         } else {
 400                                 printf("libfdt fdt_getprop(): %s\n",
 401                                         fdt_strerror(len));
 402                                 return 1;
 403                         }
 404                 }
 405
 406         /*
 407          * Print (recursive) / List (single level)
 408          */
 409         } else if ((argv[1][0] == 'p') || (argv[1][0] == 'l')) {
 410                 int depth = MAX_LEVEL;  /* how deep to print */
 411                 char *pathp;            /* path */
 412                 char *prop;             /* property */
 413                 int  ret;               /* return value */
 414                 static char root[2] = "/";
 415
 416                 /*
 417                  * list is an alias for print, but limited to 1 level
 418                  */
 419                 if (argv[1][0] == 'l') {
 420                         depth = 1;
 421                 }
 422
 423                 /*
 424                  * Get the starting path.  The root node is an oddball,
 425                  * the offset is zero and has no name.
 426                  */
 427                 if (argc == 2)
 428                         pathp = root;
 429                 else
 430                         pathp = argv[2];
 431                 if (argc > 3)
 432                         prop = argv[3];
 433                 else
 434                         prop = NULL;
 435
 436                 ret = fdt_print(pathp, prop, depth);
 437                 if (ret != 0)
 438                         return ret;
 439
 440         /*
 441          * Remove a property/node
 442          */
 443         } else if (strncmp(argv[1], "rm", 2) == 0) {
 444                 int  nodeoffset;        /* node offset from libfdt */
 445                 int  err;
 446
 447                 /*
 448                  * Get the path.  The root node is an oddball, the offset
 449                  * is zero and has no name.
 450                  */
 451                 nodeoffset = fdt_path_offset (working_fdt, argv[2]);
 452                 if (nodeoffset < 0) {
 453                         /*
 454                          * Not found or something else bad happened.
 455                          */
 456                         printf ("libfdt fdt_path_offset() returned %s\n",
 457                                 fdt_strerror(nodeoffset));
 458                         return 1;
 459                 }
 460                 /*
 461                  * Do the delete.  A fourth parameter means delete a property,
 462                  * otherwise delete the node.
 463                  */
 464                 if (argc > 3) {
 465                         err = fdt_delprop(working_fdt, nodeoffset, argv[3]);
 466                         if (err < 0) {
 467                                 printf("libfdt fdt_delprop():  %s\n",
 468                                         fdt_strerror(err));
 469                                 return err;
 470                         }
 471                 } else {
 472                         err = fdt_del_node(working_fdt, nodeoffset);
 473                         if (err < 0) {
 474                                 printf("libfdt fdt_del_node():  %s\n",
 475                                         fdt_strerror(err));
 476                                 return err;
 477                         }
 478                 }
 479
 480         /*
 481          * Display header info
 482          */
 483         } else if (argv[1][0] == 'h') {
 484                 u32 version = fdt_version(working_fdt);
 485                 printf("magic:\t\t\t0x%x\n", fdt_magic(working_fdt));
 486                 printf("totalsize:\t\t0x%x (%d)\n", fdt_totalsize(working_fdt),
 487                        fdt_totalsize(working_fdt));
 488                 printf("off_dt_struct:\t\t0x%x\n",
 489                        fdt_off_dt_struct(working_fdt));
 490                 printf("off_dt_strings:\t\t0x%x\n",
 491                        fdt_off_dt_strings(working_fdt));
 492                 printf("off_mem_rsvmap:\t\t0x%x\n",
 493                        fdt_off_mem_rsvmap(working_fdt));
 494                 printf("version:\t\t%d\n", version);
 495                 printf("last_comp_version:\t%d\n",
 496                        fdt_last_comp_version(working_fdt));
 497                 if (version >= 2)
 498                         printf("boot_cpuid_phys:\t0x%x\n",
 499                                 fdt_boot_cpuid_phys(working_fdt));
 500                 if (version >= 3)
 501                         printf("size_dt_strings:\t0x%x\n",
 502                                 fdt_size_dt_strings(working_fdt));
 503                 if (version >= 17)
 504                         printf("size_dt_struct:\t\t0x%x\n",
 505                                 fdt_size_dt_struct(working_fdt));
 506                 printf("number mem_rsv:\t\t0x%x\n",
 507                        fdt_num_mem_rsv(working_fdt));
 508                 printf("\n");
 509
 510         /*
 511          * Set boot cpu id
 512          */
 513         } else if (strncmp(argv[1], "boo", 3) == 0) {
 514                 unsigned long tmp = simple_strtoul(argv[2], NULL, 16);
 515                 fdt_set_boot_cpuid_phys(working_fdt, tmp);
 516
 517         /*
 518          * memory command
 519          */
 520         } else if (strncmp(argv[1], "me", 2) == 0) {
 521                 uint64_t addr, size;
 522                 int err;
 523                 addr = simple_strtoull(argv[2], NULL, 16);
 524                 size = simple_strtoull(argv[3], NULL, 16);
 525                 err = fdt_fixup_memory(working_fdt, addr, size);
 526                 if (err < 0)
 527                         return err;
 528
 529         /*
 530          * mem reserve commands
 531          */
 532         } else if (strncmp(argv[1], "rs", 2) == 0) {
 533                 if (argv[2][0] == 'p') {
 534                         uint64_t addr, size;
 535                         int total = fdt_num_mem_rsv(working_fdt);
 536                         int j, err;
 537                         printf("index\t\t   start\t\t    size\n");
 538                         printf("-------------------------------"
 539                                 "-----------------\n");
 540                         for (j = 0; j < total; j++) {
 541                                 err = fdt_get_mem_rsv(working_fdt, j, &addr, &size);
 542                                 if (err < 0) {
 543                                         printf("libfdt fdt_get_mem_rsv():  %s\n",
 544                                                         fdt_strerror(err));
 545                                         return err;
 546                                 }
 547                                 printf("    %x\t%08x%08x\t%08x%08x\n", j,
 548                                         (u32)(addr >> 32),
 549                                         (u32)(addr & 0xffffffff),
 550                                         (u32)(size >> 32),
 551                                         (u32)(size & 0xffffffff));
 552                         }
 553                 } else if (argv[2][0] == 'a') {
 554                         uint64_t addr, size;
 555                         int err;
 556                         addr = simple_strtoull(argv[3], NULL, 16);
 557                         size = simple_strtoull(argv[4], NULL, 16);
 558                         err = fdt_add_mem_rsv(working_fdt, addr, size);
 559
 560                         if (err < 0) {
 561                                 printf("libfdt fdt_add_mem_rsv():  %s\n",
 562                                         fdt_strerror(err));
 563                                 return err;
 564                         }
 565                 } else if (argv[2][0] == 'd') {
 566                         unsigned long idx = simple_strtoul(argv[3], NULL, 16);
 567                         int err = fdt_del_mem_rsv(working_fdt, idx);
 568
 569                         if (err < 0) {
 570                                 printf("libfdt fdt_del_mem_rsv():  %s\n",
 571                                         fdt_strerror(err));
 572                                 return err;
 573                         }
 574                 } else {
 575                         /* Unrecognized command */
 576                         return CMD_RET_USAGE;
 577                 }
 578         }
 579 #ifdef CONFIG_OF_BOARD_SETUP
 580         /* Call the board-specific fixup routine */
 581         else if (strncmp(argv[1], "boa", 3) == 0)
 582                 ft_board_setup(working_fdt, gd->bd);
 583 #endif
 584         /* Create a chosen node */
 585         else if (argv[1][0] == 'c') {
 586                 unsigned long initrd_start = 0, initrd_end = 0;
 587
 588                 if ((argc != 2) && (argc != 4))
 589                         return CMD_RET_USAGE;
 590
 591                 if (argc == 4) {
 592                         initrd_start = simple_strtoul(argv[2], NULL, 16);
 593                         initrd_end = simple_strtoul(argv[3], NULL, 16);
 594                 }
 595
 596                 fdt_chosen(working_fdt, 1);
 597                 fdt_initrd(working_fdt, initrd_start, initrd_end, 1);
 598         }
 599         /* resize the fdt */
 600         else if (strncmp(argv[1], "re", 2) == 0) {
 601                 fdt_resize(working_fdt);
 602         }
 603         else {
 604                 /* Unrecognized command */
 605                 return CMD_RET_USAGE;
 606         }
 607
 608         return 0;
 609 }
 610
 611 /****************************************************************************/
 612
 613 /**
 614  * fdt_valid() - Check if an FDT is valid. If not, change it to NULL
 615  *
 616  * @blobp: Pointer to FDT pointer
 617  * @return 1 if OK, 0 if bad (in which case *blobp is set to NULL)
 618  */
 619 static int fdt_valid(struct fdt_header **blobp)
 620 {
 621         const void *blob = *blobp;
 622         int err;
 623
 624         if (blob == NULL) {
 625                 printf ("The address of the fdt is invalid (NULL).\n");
 626                 return 0;
 627         }
 628
 629         err = fdt_check_header(blob);
 630         if (err == 0)
 631                 return 1;       /* valid */
 632
 633         if (err < 0) {
 634                 printf("libfdt fdt_check_header(): %s", fdt_strerror(err));
 635                 /*
 636                  * Be more informative on bad version.
 637                  */
 638                 if (err == -FDT_ERR_BADVERSION) {
 639                         if (fdt_version(blob) <
 640                             FDT_FIRST_SUPPORTED_VERSION) {
 641                                 printf (" - too old, fdt %d < %d",
 642                                         fdt_version(blob),
 643                                         FDT_FIRST_SUPPORTED_VERSION);
 644                         }
 645                         if (fdt_last_comp_version(blob) >
 646                             FDT_LAST_SUPPORTED_VERSION) {
 647                                 printf (" - too new, fdt %d > %d",
 648                                         fdt_version(blob),
 649                                         FDT_LAST_SUPPORTED_VERSION);
 650                         }
 651                 }
 652                 printf("\n");
 653                 *blobp = NULL;
 654                 return 0;
 655         }
 656         return 1;
 657 }
 658
 659 /****************************************************************************/
 660
 661 /*
 662  * Parse the user's input, partially heuristic.  Valid formats:
 663  * <0x00112233 4 05>    - an array of cells.  Numbers follow standard
 664  *                      C conventions.
 665  * [00 11 22 .. nn] - byte stream
 666  * "string"     - If the the value doesn't start with "<" or "[", it is
 667  *                      treated as a string.  Note that the quotes are
 668  *                      stripped by the parser before we get the string.
 669  * newval: An array of strings containing the new property as specified
 670  *      on the command line
 671  * count: The number of strings in the array
 672  * data: A bytestream to be placed in the property
 673  * len: The length of the resulting bytestream
 674  */
 675 static int fdt_parse_prop(char * const *newval, int count, char *data, int *len)
 676 {
 677         char *cp;               /* temporary char pointer */
 678         char *newp;             /* temporary newval char pointer */
 679         unsigned long tmp;      /* holds converted values */
 680         int stridx = 0;
 681
 682         *len = 0;
 683         newp = newval[0];
 684
 685         /* An array of cells */
 686         if (*newp == '<') {
 687                 newp++;
 688                 while ((*newp != '>') && (stridx < count)) {
 689                         /*
 690                          * Keep searching until we find that last ">"
 691                          * That way users don't have to escape the spaces
 692                          */
 693                         if (*newp == '\0') {
 694                                 newp = newval[++stridx];
 695                                 continue;
 696                         }
 697
 698                         cp = newp;
 699                         tmp = simple_strtoul(cp, &newp, 0);
 700                         *(__be32 *)data = __cpu_to_be32(tmp);
 701                         data  += 4;
 702                         *len += 4;
 703
 704                         /* If the ptr didn't advance, something went wrong */
 705                         if ((newp - cp) <= 0) {
 706                                 printf("Sorry, I could not convert \"%s\"\n",
 707                                         cp);
 708                                 return 1;
 709                         }
 710
 711                         while (*newp == ' ')
 712                                 newp++;
 713                 }
 714
 715                 if (*newp != '>') {
 716                         printf("Unexpected character '%c'\n", *newp);
 717                         return 1;
 718                 }
 719         } else if (*newp == '[') {
 720                 /*
 721                  * Byte stream.  Convert the values.
 722                  */
 723                 newp++;
 724                 while ((stridx < count) && (*newp != ']')) {
 725                         while (*newp == ' ')
 726                                 newp++;
 727                         if (*newp == '\0') {
 728                                 newp = newval[++stridx];
 729                                 continue;
 730                         }
 731                         if (!isxdigit(*newp))
 732                                 break;
 733                         tmp = simple_strtoul(newp, &newp, 16);
 734                         *data++ = tmp & 0xFF;
 735                         *len    = *len + 1;
 736                 }
 737                 if (*newp != ']') {
 738                         printf("Unexpected character '%c'\n", *newp);
 739                         return 1;
 740                 }
 741         } else {
 742                 /*
 743                  * Assume it is one or more strings.  Copy it into our
 744                  * data area for convenience (including the
 745                  * terminating '\0's).
 746                  */
 747                 while (stridx < count) {
 748                         size_t length = strlen(newp) + 1;
 749                         strcpy(data, newp);
 750                         data += length;
 751                         *len += length;
 752                         newp = newval[++stridx];
 753                 }
 754         }
 755         return 0;
 756 }
 757
 758 /****************************************************************************/
 759
 760 /*
 761  * Heuristic to guess if this is a string or concatenated strings.
 762  */
 763
 764 static int is_printable_string(const void *data, int len)
 765 {
 766         const char *s = data;
 767
 768         /* zero length is not */
 769         if (len == 0)
 770                 return 0;
 771
 772         /* must terminate with zero or '\n' */
 773         if (s[len - 1] != '\0' && s[len - 1] != '\n')
 774                 return 0;
 775
 776         /* printable or a null byte (concatenated strings) */
 777         while (((*s == '\0') || isprint(*s) || isspace(*s)) && (len > 0)) {
 778                 /*
 779                  * If we see a null, there are three possibilities:
 780                  * 1) If len == 1, it is the end of the string, printable
 781                  * 2) Next character also a null, not printable.
 782                  * 3) Next character not a null, continue to check.
 783                  */
 784                 if (s[0] == '\0') {
 785                         if (len == 1)
 786                                 return 1;
 787                         if (s[1] == '\0')
 788                                 return 0;
 789                 }
 790                 s++;
 791                 len--;
 792         }
 793
 794         /* Not the null termination, or not done yet: not printable */
 795         if (*s != '\0' || (len != 0))
 796                 return 0;
 797
 798         return 1;
 799 }
 800
 801
 802 /*
 803  * Print the property in the best format, a heuristic guess.  Print as
 804  * a string, concatenated strings, a byte, word, double word, or (if all
 805  * else fails) it is printed as a stream of bytes.
 806  */
 807 static void print_data(const void *data, int len)
 808 {
 809         int j;
 810
 811         /* no data, don't print */
 812         if (len == 0)
 813                 return;
 814
 815         /*
 816          * It is a string, but it may have multiple strings (embedded '\0's).
 817          */
 818         if (is_printable_string(data, len)) {
 819                 puts("\"");
 820                 j = 0;
 821                 while (j < len) {
 822                         if (j > 0)
 823                                 puts("\", \"");
 824                         puts(data);
 825                         j    += strlen(data) + 1;
 826                         data += strlen(data) + 1;
 827                 }
 828                 puts("\"");
 829                 return;
 830         }
 831
 832         if ((len %4) == 0) {
 833                 if (len > CONFIG_CMD_FDT_MAX_DUMP)
 834                         printf("* 0x%p [0x%08x]", data, len);
 835                 else {
 836                         const __be32 *p;
 837
 838                         printf("<");
 839                         for (j = 0, p = data; j < len/4; j++)
 840                                 printf("0x%08x%s", fdt32_to_cpu(p[j]),
 841                                         j < (len/4 - 1) ? " " : "");
 842                         printf(">");
 843                 }
 844         } else { /* anything else... hexdump */
 845                 if (len > CONFIG_CMD_FDT_MAX_DUMP)
 846                         printf("* 0x%p [0x%08x]", data, len);
 847                 else {
 848                         const u8 *s;
 849
 850                         printf("[");
 851                         for (j = 0, s = data; j < len; j++)
 852                                 printf("%02x%s", s[j], j < len - 1 ? " " : "");
 853                         printf("]");
 854                 }
 855         }
 856 }
 857
 858 /****************************************************************************/
 859
 860 /*
 861  * Recursively print (a portion of) the working_fdt.  The depth parameter
 862  * determines how deeply nested the fdt is printed.
 863  */
 864 static int fdt_print(const char *pathp, char *prop, int depth)
 865 {
 866         static char tabs[MAX_LEVEL+1] =
 867                 "\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t"
 868                 "\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t";
 869         const void *nodep;      /* property node pointer */
 870         int  nodeoffset;        /* node offset from libfdt */
 871         int  nextoffset;        /* next node offset from libfdt */
 872         uint32_t tag;           /* tag */
 873         int  len;               /* length of the property */
 874         int  level = 0;         /* keep track of nesting level */
 875         const struct fdt_property *fdt_prop;
 876
 877         nodeoffset = fdt_path_offset (working_fdt, pathp);
 878         if (nodeoffset < 0) {
 879                 /*
 880                  * Not found or something else bad happened.
 881                  */
 882                 printf ("libfdt fdt_path_offset() returned %s\n",
 883                         fdt_strerror(nodeoffset));
 884                 return 1;
 885         }
 886         /*
 887          * The user passed in a property as well as node path.
 888          * Print only the given property and then return.
 889          */
 890         if (prop) {
 891                 nodep = fdt_getprop (working_fdt, nodeoffset, prop, &len);
 892                 if (len == 0) {
 893                         /* no property value */
 894                         printf("%s %s\n", pathp, prop);
 895                         return 0;
 896                 } else if (len > 0) {
 897                         printf("%s = ", prop);
 898                         print_data (nodep, len);
 899                         printf("\n");
 900                         return 0;
 901                 } else {
 902                         printf ("libfdt fdt_getprop(): %s\n",
 903                                 fdt_strerror(len));
 904                         return 1;
 905                 }
 906         }
 907
 908         /*
 909          * The user passed in a node path and no property,
 910          * print the node and all subnodes.
 911          */
 912         while(level >= 0) {
 913                 tag = fdt_next_tag(working_fdt, nodeoffset, &nextoffset);
 914                 switch(tag) {
 915                 case FDT_BEGIN_NODE:
 916                         pathp = fdt_get_name(working_fdt, nodeoffset, NULL);
 917                         if (level <= depth) {
 918                                 if (pathp == NULL)
 919                                         pathp = "/* NULL pointer error */";
 920                                 if (*pathp == '\0')
 921                                         pathp = "/";    /* root is nameless */
 922                                 printf("%s%s {\n",
 923                                         &tabs[MAX_LEVEL - level], pathp);
 924                         }
 925                         level++;
 926                         if (level >= MAX_LEVEL) {
 927                                 printf("Nested too deep, aborting.\n");
 928                                 return 1;
 929                         }
 930                         break;
 931                 case FDT_END_NODE:
 932                         level--;
 933                         if (level <= depth)
 934                                 printf("%s};\n", &tabs[MAX_LEVEL - level]);
 935                         if (level == 0) {
 936                                 level = -1;             /* exit the loop */
 937                         }
 938                         break;
 939                 case FDT_PROP:
 940                         fdt_prop = fdt_offset_ptr(working_fdt, nodeoffset,
 941                                         sizeof(*fdt_prop));
 942                         pathp    = fdt_string(working_fdt,
 943                                         fdt32_to_cpu(fdt_prop->nameoff));
 944                         len      = fdt32_to_cpu(fdt_prop->len);
 945                         nodep    = fdt_prop->data;
 946                         if (len < 0) {
 947                                 printf ("libfdt fdt_getprop(): %s\n",
 948                                         fdt_strerror(len));
 949                                 return 1;
 950                         } else if (len == 0) {
 951                                 /* the property has no value */
 952                                 if (level <= depth)
 953                                         printf("%s%s;\n",
 954                                                 &tabs[MAX_LEVEL - level],
 955                                                 pathp);
 956                         } else {
 957                                 if (level <= depth) {
 958                                         printf("%s%s = ",
 959                                                 &tabs[MAX_LEVEL - level],
 960                                                 pathp);
 961                                         print_data (nodep, len);
 962                                         printf(";\n");
 963                                 }
 964                         }
 965                         break;
 966                 case FDT_NOP:
 967                         printf("%s/* NOP */\n", &tabs[MAX_LEVEL - level]);
 968                         break;
 969                 case FDT_END:
 970                         return 1;
 971                 default:
 972                         if (level <= depth)
 973                                 printf("Unknown tag 0x%08X\n", tag);
 974                         return 1;
 975                 }
 976                 nodeoffset = nextoffset;
 977         }
 978         return 0;
 979 }
 980
 981 /********************************************************************/
 982 #ifdef CONFIG_SYS_LONGHELP
 983 static char fdt_help_text[] =
 984         "addr [-c]  <addr> [<length>]   - Set the [control] fdt location to <addr>\n"
 985 #ifdef CONFIG_OF_BOARD_SETUP
 986         "fdt boardsetup                      - Do board-specific set up\n"
 987 #endif
 988         "fdt move   <fdt> <newaddr> <length> - Copy the fdt to <addr> and make it active\n"
 989         "fdt resize                          - Resize fdt to size + padding to 4k addr\n"
 990         "fdt print  <path> [<prop>]          - Recursive print starting at <path>\n"
 991         "fdt list   <path> [<prop>]          - Print one level starting at <path>\n"
 992         "fdt get value <var> <path> <prop>   - Get <property> and store in <var>\n"
 993         "fdt get name <var> <path> <index>   - Get name of node <index> and store in <var>\n"
 994         "fdt get addr <var> <path> <prop>    - Get start address of <property> and store in <var>\n"
 995         "fdt get size <var> <path> [<prop>]  - Get size of [<property>] or num nodes and store in <var>\n"
 996         "fdt set    <path> <prop> [<val>]    - Set <property> [to <val>]\n"
 997         "fdt mknode <path> <node>            - Create a new node after <path>\n"
 998         "fdt rm     <path> [<prop>]          - Delete the node or <property>\n"
 999         "fdt header                          - Display header info\n"
1000         "fdt bootcpu <id>                    - Set boot cpuid\n"
1001         "fdt memory <addr> <size>            - Add/Update memory node\n"
1002         "fdt rsvmem print                    - Show current mem reserves\n"
1003         "fdt rsvmem add <addr> <size>        - Add a mem reserve\n"
1004         "fdt rsvmem delete <index>           - Delete a mem reserves\n"
1005         "fdt chosen [<start> <end>]          - Add/update the /chosen branch in the tree\n"
1006         "                                        <start>/<end> - initrd start/end addr\n"
1007         "NOTE: Dereference aliases by omiting the leading '/', "
1008                 "e.g. fdt print ethernet0.";
1009 #endif
1010
1011 U_BOOT_CMD(
1012         fdt,    255,    0,      do_fdt,
1013         "flattened device tree utility commands", fdt_help_text
1014 );