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