cmd/fdt.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * (C) Copyright 2007
   4  * Gerald Van Baren, Custom IDEAS, vanbaren@cideas.com
   5  * Based on code written by:
   6  *   Pantelis Antoniou <pantelis.antoniou@gmail.com> and
   7  *   Matthew McClintock <msm@freescale.com>
   8  */
   9
  10 #include <common.h>
  11 #include <command.h>
  12 #include <env.h>
  13 #include <image.h>
  14 #include <linux/ctype.h>
  15 #include <linux/types.h>
  16 #include <asm/global_data.h>
  17 #include <linux/libfdt.h>
  18 #include <fdt_support.h>
  19 #include <mapmem.h>
  20 #include <asm/io.h>
  21
  22 #define MAX_LEVEL       32              /* how deeply nested we will go */
  23 #define SCRATCHPAD      1024            /* bytes of scratchpad memory */
  24
  25 /*
  26  * Global data (for the gd->bd)
  27  */
  28 DECLARE_GLOBAL_DATA_PTR;
  29
  30 static int fdt_parse_prop(char *const*newval, int count, char *data, int *len);
  31 static int fdt_print(const char *pathp, char *prop, int depth);
  32 static int is_printable_string(const void *data, int len);
  33
  34 /*
  35  * The working_fdt points to our working flattened device tree.
  36  */
  37 struct fdt_header *working_fdt;
  38
  39 void set_working_fdt_addr(ulong addr)
  40 {
  41         void *buf;
  42
  43         buf = map_sysmem(addr, 0);
  44         working_fdt = buf;
  45         env_set_hex("fdtaddr", addr);
  46 }
  47
  48 /*
  49  * Get a value from the fdt and format it to be set in the environment
  50  */
  51 static int fdt_value_env_set(const void *nodep, int len, const char *var)
  52 {
  53         if (is_printable_string(nodep, len))
  54                 env_set(var, (void *)nodep);
  55         else if (len == 4) {
  56                 char buf[11];
  57
  58                 sprintf(buf, "0x%08X", fdt32_to_cpu(*(fdt32_t *)nodep));
  59                 env_set(var, buf);
  60         } else if (len%4 == 0 && len <= 20) {
  61                 /* Needed to print things like sha1 hashes. */
  62                 char buf[41];
  63                 int i;
  64
  65                 for (i = 0; i < len; i += sizeof(unsigned int))
  66                         sprintf(buf + (i * 2), "%08x",
  67                                 *(unsigned int *)(nodep + i));
  68                 env_set(var, buf);
  69         } else {
  70                 printf("error: unprintable value\n");
  71                 return 1;
  72         }
  73         return 0;
  74 }
  75
  76 static const char * const fdt_member_table[] = {
  77         "magic",
  78         "totalsize",
  79         "off_dt_struct",
  80         "off_dt_strings",
  81         "off_mem_rsvmap",
  82         "version",
  83         "last_comp_version",
  84         "boot_cpuid_phys",
  85         "size_dt_strings",
  86         "size_dt_struct",
  87 };
  88
  89 static int fdt_get_header_value(int argc, char *const argv[])
  90 {
  91         fdt32_t *fdtp = (fdt32_t *)working_fdt;
  92         ulong val;
  93         int i;
  94
  95         if (argv[2][0] != 'g')
  96                 return CMD_RET_FAILURE;
  97
  98         for (i = 0; i < ARRAY_SIZE(fdt_member_table); i++) {
  99                 if (strcmp(fdt_member_table[i], argv[4]))
 100                         continue;
 101
 102                 val = fdt32_to_cpu(fdtp[i]);
 103                 env_set_hex(argv[3], val);
 104                 return CMD_RET_SUCCESS;
 105         }
 106
 107         return CMD_RET_FAILURE;
 108 }
 109
 110 /*
 111  * Flattened Device Tree command, see the help for parameter definitions.
 112  */
 113 static int do_fdt(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[])
 114 {
 115         if (argc < 2)
 116                 return CMD_RET_USAGE;
 117
 118         /* fdt addr: Set the address of the fdt */
 119         if (strncmp(argv[1], "ad", 2) == 0) {
 120                 unsigned long addr;
 121                 int control = 0;
 122                 struct fdt_header *blob;
 123
 124                 /* Set the address [and length] of the fdt */
 125                 argc -= 2;
 126                 argv += 2;
 127                 if (argc && !strcmp(*argv, "-c")) {
 128                         control = 1;
 129                         argc--;
 130                         argv++;
 131                 }
 132                 if (argc == 0) {
 133                         if (control)
 134                                 blob = (struct fdt_header *)gd->fdt_blob;
 135                         else
 136                                 blob = working_fdt;
 137                         if (!blob || !fdt_valid(&blob))
 138                                 return 1;
 139                         printf("%s fdt: %08lx\n",
 140                                control ? "Control" : "Working",
 141                                control ? (ulong)map_to_sysmem(blob) :
 142                                env_get_hex("fdtaddr", 0));
 143                         return 0;
 144                 }
 145
 146                 addr = hextoul(argv[0], NULL);
 147                 blob = map_sysmem(addr, 0);
 148                 if (!fdt_valid(&blob))
 149                         return 1;
 150                 if (control)
 151                         gd->fdt_blob = blob;
 152                 else
 153                         set_working_fdt_addr(addr);
 154
 155                 if (argc >= 2) {
 156                         int  len;
 157                         int  err;
 158
 159                         /* Optional new length */
 160                         len = hextoul(argv[1], NULL);
 161                         if (len < fdt_totalsize(blob)) {
 162                                 printf("New length %d < existing length %d, ignoring\n",
 163                                        len, fdt_totalsize(blob));
 164                         } else {
 165                                 /* Open in place with a new length */
 166                                 err = fdt_open_into(blob, blob, len);
 167                                 if (err != 0) {
 168                                         printf("libfdt fdt_open_into(): %s\n",
 169                                                fdt_strerror(err));
 170                                 }
 171                         }
 172                 }
 173
 174                 return CMD_RET_SUCCESS;
 175         }
 176
 177         if (!working_fdt) {
 178                 puts("No FDT memory address configured. Please configure\n"
 179                      "the FDT address via \"fdt addr <address>\" command.\n"
 180                      "Aborting!\n");
 181                 return CMD_RET_FAILURE;
 182         }
 183
 184         /*
 185          * Move the working_fdt
 186          */
 187         if (strncmp(argv[1], "mo", 2) == 0) {
 188                 struct fdt_header *newaddr;
 189                 int  len;
 190                 int  err;
 191
 192                 if (argc < 4)
 193                         return CMD_RET_USAGE;
 194
 195                 /*
 196                  * Set the address and length of the fdt.
 197                  */
 198                 working_fdt = (struct fdt_header *)hextoul(argv[2], NULL);
 199                 if (!fdt_valid(&working_fdt))
 200                         return 1;
 201
 202                 newaddr = (struct fdt_header *)hextoul(argv[3], NULL);
 203
 204                 /*
 205                  * If the user specifies a length, use that.  Otherwise use the
 206                  * current length.
 207                  */
 208                 if (argc <= 4) {
 209                         len = fdt_totalsize(working_fdt);
 210                 } else {
 211                         len = hextoul(argv[4], NULL);
 212                         if (len < fdt_totalsize(working_fdt)) {
 213                                 printf ("New length 0x%X < existing length "
 214                                         "0x%X, aborting.\n",
 215                                         len, fdt_totalsize(working_fdt));
 216                                 return 1;
 217                         }
 218                 }
 219
 220                 /*
 221                  * Copy to the new location.
 222                  */
 223                 err = fdt_open_into(working_fdt, newaddr, len);
 224                 if (err != 0) {
 225                         printf ("libfdt fdt_open_into(): %s\n",
 226                                 fdt_strerror(err));
 227                         return 1;
 228                 }
 229                 set_working_fdt_addr((ulong)newaddr);
 230 #ifdef CONFIG_OF_SYSTEM_SETUP
 231         /* Call the board-specific fixup routine */
 232         } else if (strncmp(argv[1], "sys", 3) == 0) {
 233                 int err = ft_system_setup(working_fdt, gd->bd);
 234
 235                 if (err) {
 236                         printf("Failed to add system information to FDT: %s\n",
 237                                fdt_strerror(err));
 238                         return CMD_RET_FAILURE;
 239                 }
 240 #endif
 241         /*
 242          * Make a new node
 243          */
 244         } else if (strncmp(argv[1], "mk", 2) == 0) {
 245                 char *pathp;            /* path */
 246                 char *nodep;            /* new node to add */
 247                 int  nodeoffset;        /* node offset from libfdt */
 248                 int  err;
 249
 250                 /*
 251                  * Parameters: Node path, new node to be appended to the path.
 252                  */
 253                 if (argc < 4)
 254                         return CMD_RET_USAGE;
 255
 256                 pathp = argv[2];
 257                 nodep = argv[3];
 258
 259                 nodeoffset = fdt_path_offset (working_fdt, pathp);
 260                 if (nodeoffset < 0) {
 261                         /*
 262                          * Not found or something else bad happened.
 263                          */
 264                         printf ("libfdt fdt_path_offset() returned %s\n",
 265                                 fdt_strerror(nodeoffset));
 266                         return 1;
 267                 }
 268                 err = fdt_add_subnode(working_fdt, nodeoffset, nodep);
 269                 if (err < 0) {
 270                         printf ("libfdt fdt_add_subnode(): %s\n",
 271                                 fdt_strerror(err));
 272                         return 1;
 273                 }
 274
 275         /*
 276          * Set the value of a property in the working_fdt.
 277          */
 278         } else if (strncmp(argv[1], "se", 2) == 0) {
 279                 char *pathp;            /* path */
 280                 char *prop;             /* property */
 281                 int  nodeoffset;        /* node offset from libfdt */
 282                 static char data[SCRATCHPAD] __aligned(4);/* property storage */
 283                 const void *ptmp;
 284                 int  len;               /* new length of the property */
 285                 int  ret;               /* return value */
 286
 287                 /*
 288                  * Parameters: Node path, property, optional value.
 289                  */
 290                 if (argc < 4)
 291                         return CMD_RET_USAGE;
 292
 293                 pathp  = argv[2];
 294                 prop   = argv[3];
 295
 296                 nodeoffset = fdt_path_offset (working_fdt, pathp);
 297                 if (nodeoffset < 0) {
 298                         /*
 299                          * Not found or something else bad happened.
 300                          */
 301                         printf ("libfdt fdt_path_offset() returned %s\n",
 302                                 fdt_strerror(nodeoffset));
 303                         return 1;
 304                 }
 305
 306                 if (argc == 4) {
 307                         len = 0;
 308                 } else {
 309                         ptmp = fdt_getprop(working_fdt, nodeoffset, prop, &len);
 310                         if (len > SCRATCHPAD) {
 311                                 printf("prop (%d) doesn't fit in scratchpad!\n",
 312                                        len);
 313                                 return 1;
 314                         }
 315                         if (ptmp != NULL)
 316                                 memcpy(data, ptmp, len);
 317
 318                         ret = fdt_parse_prop(&argv[4], argc - 4, data, &len);
 319                         if (ret != 0)
 320                                 return ret;
 321                 }
 322
 323                 ret = fdt_setprop(working_fdt, nodeoffset, prop, data, len);
 324                 if (ret < 0) {
 325                         printf ("libfdt fdt_setprop(): %s\n", fdt_strerror(ret));
 326                         return 1;
 327                 }
 328
 329         /********************************************************************
 330          * Get the value of a property in the working_fdt.
 331          ********************************************************************/
 332         } else if (argv[1][0] == 'g') {
 333                 char *subcmd;           /* sub-command */
 334                 char *pathp;            /* path */
 335                 char *prop;             /* property */
 336                 char *var;              /* variable to store result */
 337                 int  nodeoffset;        /* node offset from libfdt */
 338                 const void *nodep;      /* property node pointer */
 339                 int  len = 0;           /* new length of the property */
 340
 341                 /*
 342                  * Parameters: Node path, property, optional value.
 343                  */
 344                 if (argc < 5)
 345                         return CMD_RET_USAGE;
 346
 347                 subcmd = argv[2];
 348
 349                 if (argc < 6 && subcmd[0] != 's')
 350                         return CMD_RET_USAGE;
 351
 352                 var    = argv[3];
 353                 pathp  = argv[4];
 354                 prop   = argv[5];
 355
 356                 nodeoffset = fdt_path_offset(working_fdt, pathp);
 357                 if (nodeoffset < 0) {
 358                         /*
 359                          * Not found or something else bad happened.
 360                          */
 361                         printf("libfdt fdt_path_offset() returned %s\n",
 362                                 fdt_strerror(nodeoffset));
 363                         return 1;
 364                 }
 365
 366                 if (subcmd[0] == 'n' || (subcmd[0] == 's' && argc == 5)) {
 367                         int req_index = -1;
 368                         int startDepth = fdt_node_depth(
 369                                 working_fdt, nodeoffset);
 370                         int curDepth = startDepth;
 371                         int cur_index = -1;
 372                         int nextNodeOffset = fdt_next_node(
 373                                 working_fdt, nodeoffset, &curDepth);
 374
 375                         if (subcmd[0] == 'n')
 376                                 req_index = hextoul(argv[5], NULL);
 377
 378                         while (curDepth > startDepth) {
 379                                 if (curDepth == startDepth + 1)
 380                                         cur_index++;
 381                                 if (subcmd[0] == 'n' &&
 382                                     cur_index == req_index) {
 383                                         const char *node_name;
 384
 385                                         node_name = fdt_get_name(working_fdt,
 386                                                                  nextNodeOffset,
 387                                                                  NULL);
 388                                         env_set(var, node_name);
 389                                         return 0;
 390                                 }
 391                                 nextNodeOffset = fdt_next_node(
 392                                         working_fdt, nextNodeOffset, &curDepth);
 393                                 if (nextNodeOffset < 0)
 394                                         break;
 395                         }
 396                         if (subcmd[0] == 's') {
 397                                 /* get the num nodes at this level */
 398                                 env_set_ulong(var, cur_index + 1);
 399                         } else {
 400                                 /* node index not found */
 401                                 printf("libfdt node not found\n");
 402                                 return 1;
 403                         }
 404                 } else {
 405                         nodep = fdt_getprop(
 406                                 working_fdt, nodeoffset, prop, &len);
 407                         if (len == 0) {
 408                                 /* no property value */
 409                                 env_set(var, "");
 410                                 return 0;
 411                         } else if (nodep && len > 0) {
 412                                 if (subcmd[0] == 'v') {
 413                                         int ret;
 414
 415                                         ret = fdt_value_env_set(nodep, len,
 416                                                                 var);
 417                                         if (ret != 0)
 418                                                 return ret;
 419                                 } else if (subcmd[0] == 'a') {
 420                                         /* Get address */
 421                                         char buf[11];
 422
 423                                         sprintf(buf, "0x%p", nodep);
 424                                         env_set(var, buf);
 425                                 } else if (subcmd[0] == 's') {
 426                                         /* Get size */
 427                                         char buf[11];
 428
 429                                         sprintf(buf, "0x%08X", len);
 430                                         env_set(var, buf);
 431                                 } else
 432                                         return CMD_RET_USAGE;
 433                                 return 0;
 434                         } else {
 435                                 printf("libfdt fdt_getprop(): %s\n",
 436                                         fdt_strerror(len));
 437                                 return 1;
 438                         }
 439                 }
 440
 441         /*
 442          * Print (recursive) / List (single level)
 443          */
 444         } else if ((argv[1][0] == 'p') || (argv[1][0] == 'l')) {
 445                 int depth = MAX_LEVEL;  /* how deep to print */
 446                 char *pathp;            /* path */
 447                 char *prop;             /* property */
 448                 int  ret;               /* return value */
 449                 static char root[2] = "/";
 450
 451                 /*
 452                  * list is an alias for print, but limited to 1 level
 453                  */
 454                 if (argv[1][0] == 'l') {
 455                         depth = 1;
 456                 }
 457
 458                 /*
 459                  * Get the starting path.  The root node is an oddball,
 460                  * the offset is zero and has no name.
 461                  */
 462                 if (argc == 2)
 463                         pathp = root;
 464                 else
 465                         pathp = argv[2];
 466                 if (argc > 3)
 467                         prop = argv[3];
 468                 else
 469                         prop = NULL;
 470
 471                 ret = fdt_print(pathp, prop, depth);
 472                 if (ret != 0)
 473                         return ret;
 474
 475         /*
 476          * Remove a property/node
 477          */
 478         } else if (strncmp(argv[1], "rm", 2) == 0) {
 479                 int  nodeoffset;        /* node offset from libfdt */
 480                 int  err;
 481
 482                 /*
 483                  * Get the path.  The root node is an oddball, the offset
 484                  * is zero and has no name.
 485                  */
 486                 nodeoffset = fdt_path_offset (working_fdt, argv[2]);
 487                 if (nodeoffset < 0) {
 488                         /*
 489                          * Not found or something else bad happened.
 490                          */
 491                         printf ("libfdt fdt_path_offset() returned %s\n",
 492                                 fdt_strerror(nodeoffset));
 493                         return 1;
 494                 }
 495                 /*
 496                  * Do the delete.  A fourth parameter means delete a property,
 497                  * otherwise delete the node.
 498                  */
 499                 if (argc > 3) {
 500                         err = fdt_delprop(working_fdt, nodeoffset, argv[3]);
 501                         if (err < 0) {
 502                                 printf("libfdt fdt_delprop():  %s\n",
 503                                         fdt_strerror(err));
 504                                 return err;
 505                         }
 506                 } else {
 507                         err = fdt_del_node(working_fdt, nodeoffset);
 508                         if (err < 0) {
 509                                 printf("libfdt fdt_del_node():  %s\n",
 510                                         fdt_strerror(err));
 511                                 return err;
 512                         }
 513                 }
 514
 515         /*
 516          * Display header info
 517          */
 518         } else if (argv[1][0] == 'h') {
 519                 if (argc == 5)
 520                         return fdt_get_header_value(argc, argv);
 521
 522                 u32 version = fdt_version(working_fdt);
 523                 printf("magic:\t\t\t0x%x\n", fdt_magic(working_fdt));
 524                 printf("totalsize:\t\t0x%x (%d)\n", fdt_totalsize(working_fdt),
 525                        fdt_totalsize(working_fdt));
 526                 printf("off_dt_struct:\t\t0x%x\n",
 527                        fdt_off_dt_struct(working_fdt));
 528                 printf("off_dt_strings:\t\t0x%x\n",
 529                        fdt_off_dt_strings(working_fdt));
 530                 printf("off_mem_rsvmap:\t\t0x%x\n",
 531                        fdt_off_mem_rsvmap(working_fdt));
 532                 printf("version:\t\t%d\n", version);
 533                 printf("last_comp_version:\t%d\n",
 534                        fdt_last_comp_version(working_fdt));
 535                 if (version >= 2)
 536                         printf("boot_cpuid_phys:\t0x%x\n",
 537                                 fdt_boot_cpuid_phys(working_fdt));
 538                 if (version >= 3)
 539                         printf("size_dt_strings:\t0x%x\n",
 540                                 fdt_size_dt_strings(working_fdt));
 541                 if (version >= 17)
 542                         printf("size_dt_struct:\t\t0x%x\n",
 543                                 fdt_size_dt_struct(working_fdt));
 544                 printf("number mem_rsv:\t\t0x%x\n",
 545                        fdt_num_mem_rsv(working_fdt));
 546                 printf("\n");
 547
 548         /*
 549          * Set boot cpu id
 550          */
 551         } else if (strncmp(argv[1], "boo", 3) == 0) {
 552                 unsigned long tmp = hextoul(argv[2], NULL);
 553                 fdt_set_boot_cpuid_phys(working_fdt, tmp);
 554
 555         /*
 556          * memory command
 557          */
 558         } else if (strncmp(argv[1], "me", 2) == 0) {
 559                 uint64_t addr, size;
 560                 int err;
 561                 addr = simple_strtoull(argv[2], NULL, 16);
 562                 size = simple_strtoull(argv[3], NULL, 16);
 563                 err = fdt_fixup_memory(working_fdt, addr, size);
 564                 if (err < 0)
 565                         return err;
 566
 567         /*
 568          * mem reserve commands
 569          */
 570         } else if (strncmp(argv[1], "rs", 2) == 0) {
 571                 if (argv[2][0] == 'p') {
 572                         uint64_t addr, size;
 573                         int total = fdt_num_mem_rsv(working_fdt);
 574                         int j, err;
 575                         printf("index\t\t   start\t\t    size\n");
 576                         printf("-------------------------------"
 577                                 "-----------------\n");
 578                         for (j = 0; j < total; j++) {
 579                                 err = fdt_get_mem_rsv(working_fdt, j, &addr, &size);
 580                                 if (err < 0) {
 581                                         printf("libfdt fdt_get_mem_rsv():  %s\n",
 582                                                         fdt_strerror(err));
 583                                         return err;
 584                                 }
 585                                 printf("    %x\t%08x%08x\t%08x%08x\n", j,
 586                                         (u32)(addr >> 32),
 587                                         (u32)(addr & 0xffffffff),
 588                                         (u32)(size >> 32),
 589                                         (u32)(size & 0xffffffff));
 590                         }
 591                 } else if (argv[2][0] == 'a') {
 592                         uint64_t addr, size;
 593                         int err;
 594                         addr = simple_strtoull(argv[3], NULL, 16);
 595                         size = simple_strtoull(argv[4], NULL, 16);
 596                         err = fdt_add_mem_rsv(working_fdt, addr, size);
 597
 598                         if (err < 0) {
 599                                 printf("libfdt fdt_add_mem_rsv():  %s\n",
 600                                         fdt_strerror(err));
 601                                 return err;
 602                         }
 603                 } else if (argv[2][0] == 'd') {
 604                         unsigned long idx = hextoul(argv[3], NULL);
 605                         int err = fdt_del_mem_rsv(working_fdt, idx);
 606
 607                         if (err < 0) {
 608                                 printf("libfdt fdt_del_mem_rsv():  %s\n",
 609                                         fdt_strerror(err));
 610                                 return err;
 611                         }
 612                 } else {
 613                         /* Unrecognized command */
 614                         return CMD_RET_USAGE;
 615                 }
 616         }
 617 #ifdef CONFIG_OF_BOARD_SETUP
 618         /* Call the board-specific fixup routine */
 619         else if (strncmp(argv[1], "boa", 3) == 0) {
 620                 int err = ft_board_setup(working_fdt, gd->bd);
 621
 622                 if (err) {
 623                         printf("Failed to update board information in FDT: %s\n",
 624                                fdt_strerror(err));
 625                         return CMD_RET_FAILURE;
 626                 }
 627 #ifdef CONFIG_ARCH_KEYSTONE
 628                 ft_board_setup_ex(working_fdt, gd->bd);
 629 #endif
 630         }
 631 #endif
 632         /* Create a chosen node */
 633         else if (strncmp(argv[1], "cho", 3) == 0) {
 634                 unsigned long initrd_start = 0, initrd_end = 0;
 635
 636                 if ((argc != 2) && (argc != 4))
 637                         return CMD_RET_USAGE;
 638
 639                 if (argc == 4) {
 640                         initrd_start = hextoul(argv[2], NULL);
 641                         initrd_end = initrd_start + hextoul(argv[3], NULL) - 1;
 642                 }
 643
 644                 fdt_chosen(working_fdt);
 645                 fdt_initrd(working_fdt, initrd_start, initrd_end);
 646
 647 #if defined(CONFIG_FIT_SIGNATURE)
 648         } else if (strncmp(argv[1], "che", 3) == 0) {
 649                 int cfg_noffset;
 650                 int ret;
 651                 unsigned long addr;
 652                 struct fdt_header *blob;
 653
 654                 if (!working_fdt)
 655                         return CMD_RET_FAILURE;
 656
 657                 if (argc > 2) {
 658                         addr = hextoul(argv[2], NULL);
 659                         blob = map_sysmem(addr, 0);
 660                 } else {
 661                         blob = (struct fdt_header *)gd->fdt_blob;
 662                 }
 663                 if (!fdt_valid(&blob))
 664                         return 1;
 665
 666                 gd->fdt_blob = blob;
 667                 cfg_noffset = fit_conf_get_node(working_fdt, NULL);
 668                 if (!cfg_noffset) {
 669                         printf("Could not find configuration node: %s\n",
 670                                fdt_strerror(cfg_noffset));
 671                         return CMD_RET_FAILURE;
 672                 }
 673
 674                 ret = fit_config_verify(working_fdt, cfg_noffset);
 675                 if (ret == 0)
 676                         return CMD_RET_SUCCESS;
 677                 else
 678                         return CMD_RET_FAILURE;
 679 #endif
 680
 681         }
 682 #ifdef CONFIG_OF_LIBFDT_OVERLAY
 683         /* apply an overlay */
 684         else if (strncmp(argv[1], "ap", 2) == 0) {
 685                 unsigned long addr;
 686                 struct fdt_header *blob;
 687                 int ret;
 688
 689                 if (argc != 3)
 690                         return CMD_RET_USAGE;
 691
 692                 if (!working_fdt)
 693                         return CMD_RET_FAILURE;
 694
 695                 addr = hextoul(argv[2], NULL);
 696                 blob = map_sysmem(addr, 0);
 697                 if (!fdt_valid(&blob))
 698                         return CMD_RET_FAILURE;
 699
 700                 /* apply method prints messages on error */
 701                 ret = fdt_overlay_apply_verbose(working_fdt, blob);
 702                 if (ret)
 703                         return CMD_RET_FAILURE;
 704         }
 705 #endif
 706         /* resize the fdt */
 707         else if (strncmp(argv[1], "re", 2) == 0) {
 708                 uint extrasize;
 709                 if (argc > 2)
 710                         extrasize = hextoul(argv[2], NULL);
 711                 else
 712                         extrasize = 0;
 713                 fdt_shrink_to_minimum(working_fdt, extrasize);
 714         }
 715         else {
 716                 /* Unrecognized command */
 717                 return CMD_RET_USAGE;
 718         }
 719
 720         return 0;
 721 }
 722
 723 /****************************************************************************/
 724
 725 /*
 726  * Parse the user's input, partially heuristic.  Valid formats:
 727  * <0x00112233 4 05>    - an array of cells.  Numbers follow standard
 728  *                      C conventions.
 729  * [00 11 22 .. nn] - byte stream
 730  * "string"     - If the the value doesn't start with "<" or "[", it is
 731  *                      treated as a string.  Note that the quotes are
 732  *                      stripped by the parser before we get the string.
 733  * newval: An array of strings containing the new property as specified
 734  *      on the command line
 735  * count: The number of strings in the array
 736  * data: A bytestream to be placed in the property
 737  * len: The length of the resulting bytestream
 738  */
 739 static int fdt_parse_prop(char * const *newval, int count, char *data, int *len)
 740 {
 741         char *cp;               /* temporary char pointer */
 742         char *newp;             /* temporary newval char pointer */
 743         unsigned long tmp;      /* holds converted values */
 744         int stridx = 0;
 745
 746         *len = 0;
 747         newp = newval[0];
 748
 749         /* An array of cells */
 750         if (*newp == '<') {
 751                 newp++;
 752                 while ((*newp != '>') && (stridx < count)) {
 753                         /*
 754                          * Keep searching until we find that last ">"
 755                          * That way users don't have to escape the spaces
 756                          */
 757                         if (*newp == '\0') {
 758                                 newp = newval[++stridx];
 759                                 continue;
 760                         }
 761
 762                         cp = newp;
 763                         tmp = simple_strtoul(cp, &newp, 0);
 764                         if (*cp != '?')
 765                                 *(fdt32_t *)data = cpu_to_fdt32(tmp);
 766                         else
 767                                 newp++;
 768
 769                         data  += 4;
 770                         *len += 4;
 771
 772                         /* If the ptr didn't advance, something went wrong */
 773                         if ((newp - cp) <= 0) {
 774                                 printf("Sorry, I could not convert \"%s\"\n",
 775                                         cp);
 776                                 return 1;
 777                         }
 778
 779                         while (*newp == ' ')
 780                                 newp++;
 781                 }
 782
 783                 if (*newp != '>') {
 784                         printf("Unexpected character '%c'\n", *newp);
 785                         return 1;
 786                 }
 787         } else if (*newp == '[') {
 788                 /*
 789                  * Byte stream.  Convert the values.
 790                  */
 791                 newp++;
 792                 while ((stridx < count) && (*newp != ']')) {
 793                         while (*newp == ' ')
 794                                 newp++;
 795                         if (*newp == '\0') {
 796                                 newp = newval[++stridx];
 797                                 continue;
 798                         }
 799                         if (!isxdigit(*newp))
 800                                 break;
 801                         tmp = hextoul(newp, &newp);
 802                         *data++ = tmp & 0xFF;
 803                         *len    = *len + 1;
 804                 }
 805                 if (*newp != ']') {
 806                         printf("Unexpected character '%c'\n", *newp);
 807                         return 1;
 808                 }
 809         } else {
 810                 /*
 811                  * Assume it is one or more strings.  Copy it into our
 812                  * data area for convenience (including the
 813                  * terminating '\0's).
 814                  */
 815                 while (stridx < count) {
 816                         size_t length = strlen(newp) + 1;
 817                         strcpy(data, newp);
 818                         data += length;
 819                         *len += length;
 820                         newp = newval[++stridx];
 821                 }
 822         }
 823         return 0;
 824 }
 825
 826 /****************************************************************************/
 827
 828 /*
 829  * Heuristic to guess if this is a string or concatenated strings.
 830  */
 831
 832 static int is_printable_string(const void *data, int len)
 833 {
 834         const char *s = data;
 835
 836         /* zero length is not */
 837         if (len == 0)
 838                 return 0;
 839
 840         /* must terminate with zero or '\n' */
 841         if (s[len - 1] != '\0' && s[len - 1] != '\n')
 842                 return 0;
 843
 844         /* printable or a null byte (concatenated strings) */
 845         while (((*s == '\0') || isprint(*s) || isspace(*s)) && (len > 0)) {
 846                 /*
 847                  * If we see a null, there are three possibilities:
 848                  * 1) If len == 1, it is the end of the string, printable
 849                  * 2) Next character also a null, not printable.
 850                  * 3) Next character not a null, continue to check.
 851                  */
 852                 if (s[0] == '\0') {
 853                         if (len == 1)
 854                                 return 1;
 855                         if (s[1] == '\0')
 856                                 return 0;
 857                 }
 858                 s++;
 859                 len--;
 860         }
 861
 862         /* Not the null termination, or not done yet: not printable */
 863         if (*s != '\0' || (len != 0))
 864                 return 0;
 865
 866         return 1;
 867 }
 868
 869
 870 /*
 871  * Print the property in the best format, a heuristic guess.  Print as
 872  * a string, concatenated strings, a byte, word, double word, or (if all
 873  * else fails) it is printed as a stream of bytes.
 874  */
 875 static void print_data(const void *data, int len)
 876 {
 877         int j;
 878         const char *env_max_dump;
 879         ulong max_dump = ULONG_MAX;
 880
 881         /* no data, don't print */
 882         if (len == 0)
 883                 return;
 884
 885         env_max_dump = env_get("fdt_max_dump");
 886         if (env_max_dump)
 887                 max_dump = hextoul(env_max_dump, NULL);
 888
 889         /*
 890          * It is a string, but it may have multiple strings (embedded '\0's).
 891          */
 892         if (is_printable_string(data, len)) {
 893                 puts("\"");
 894                 j = 0;
 895                 while (j < len) {
 896                         if (j > 0)
 897                                 puts("\", \"");
 898                         puts(data);
 899                         j    += strlen(data) + 1;
 900                         data += strlen(data) + 1;
 901                 }
 902                 puts("\"");
 903                 return;
 904         }
 905
 906         if ((len %4) == 0) {
 907                 if (len > max_dump)
 908                         printf("* 0x%p [0x%08x]", data, len);
 909                 else {
 910                         const __be32 *p;
 911
 912                         printf("<");
 913                         for (j = 0, p = data; j < len/4; j++)
 914                                 printf("0x%08x%s", fdt32_to_cpu(p[j]),
 915                                         j < (len/4 - 1) ? " " : "");
 916                         printf(">");
 917                 }
 918         } else { /* anything else... hexdump */
 919                 if (len > max_dump)
 920                         printf("* 0x%p [0x%08x]", data, len);
 921                 else {
 922                         const u8 *s;
 923
 924                         printf("[");
 925                         for (j = 0, s = data; j < len; j++)
 926                                 printf("%02x%s", s[j], j < len - 1 ? " " : "");
 927                         printf("]");
 928                 }
 929         }
 930 }
 931
 932 /****************************************************************************/
 933
 934 /*
 935  * Recursively print (a portion of) the working_fdt.  The depth parameter
 936  * determines how deeply nested the fdt is printed.
 937  */
 938 static int fdt_print(const char *pathp, char *prop, int depth)
 939 {
 940         static char tabs[MAX_LEVEL+1] =
 941                 "\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t"
 942                 "\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t";
 943         const void *nodep;      /* property node pointer */
 944         int  nodeoffset;        /* node offset from libfdt */
 945         int  nextoffset;        /* next node offset from libfdt */
 946         uint32_t tag;           /* tag */
 947         int  len;               /* length of the property */
 948         int  level = 0;         /* keep track of nesting level */
 949         const struct fdt_property *fdt_prop;
 950
 951         nodeoffset = fdt_path_offset (working_fdt, pathp);
 952         if (nodeoffset < 0) {
 953                 /*
 954                  * Not found or something else bad happened.
 955                  */
 956                 printf ("libfdt fdt_path_offset() returned %s\n",
 957                         fdt_strerror(nodeoffset));
 958                 return 1;
 959         }
 960         /*
 961          * The user passed in a property as well as node path.
 962          * Print only the given property and then return.
 963          */
 964         if (prop) {
 965                 nodep = fdt_getprop (working_fdt, nodeoffset, prop, &len);
 966                 if (len == 0) {
 967                         /* no property value */
 968                         printf("%s %s\n", pathp, prop);
 969                         return 0;
 970                 } else if (nodep && len > 0) {
 971                         printf("%s = ", prop);
 972                         print_data (nodep, len);
 973                         printf("\n");
 974                         return 0;
 975                 } else {
 976                         printf ("libfdt fdt_getprop(): %s\n",
 977                                 fdt_strerror(len));
 978                         return 1;
 979                 }
 980         }
 981
 982         /*
 983          * The user passed in a node path and no property,
 984          * print the node and all subnodes.
 985          */
 986         while(level >= 0) {
 987                 tag = fdt_next_tag(working_fdt, nodeoffset, &nextoffset);
 988                 switch(tag) {
 989                 case FDT_BEGIN_NODE:
 990                         pathp = fdt_get_name(working_fdt, nodeoffset, NULL);
 991                         if (level <= depth) {
 992                                 if (pathp == NULL)
 993                                         pathp = "/* NULL pointer error */";
 994                                 if (*pathp == '\0')
 995                                         pathp = "/";    /* root is nameless */
 996                                 printf("%s%s {\n",
 997                                         &tabs[MAX_LEVEL - level], pathp);
 998                         }
 999                         level++;
1000                         if (level >= MAX_LEVEL) {
1001                                 printf("Nested too deep, aborting.\n");
1002                                 return 1;
1003                         }
1004                         break;
1005                 case FDT_END_NODE:
1006                         level--;
1007                         if (level <= depth)
1008                                 printf("%s};\n", &tabs[MAX_LEVEL - level]);
1009                         if (level == 0) {
1010                                 level = -1;             /* exit the loop */
1011                         }
1012                         break;
1013                 case FDT_PROP:
1014                         fdt_prop = fdt_offset_ptr(working_fdt, nodeoffset,
1015                                         sizeof(*fdt_prop));
1016                         pathp    = fdt_string(working_fdt,
1017                                         fdt32_to_cpu(fdt_prop->nameoff));
1018                         len      = fdt32_to_cpu(fdt_prop->len);
1019                         nodep    = fdt_prop->data;
1020                         if (len < 0) {
1021                                 printf ("libfdt fdt_getprop(): %s\n",
1022                                         fdt_strerror(len));
1023                                 return 1;
1024                         } else if (len == 0) {
1025                                 /* the property has no value */
1026                                 if (level <= depth)
1027                                         printf("%s%s;\n",
1028                                                 &tabs[MAX_LEVEL - level],
1029                                                 pathp);
1030                         } else {
1031                                 if (level <= depth) {
1032                                         printf("%s%s = ",
1033                                                 &tabs[MAX_LEVEL - level],
1034                                                 pathp);
1035                                         print_data (nodep, len);
1036                                         printf(";\n");
1037                                 }
1038                         }
1039                         break;
1040                 case FDT_NOP:
1041                         printf("%s/* NOP */\n", &tabs[MAX_LEVEL - level]);
1042                         break;
1043                 case FDT_END:
1044                         return 1;
1045                 default:
1046                         if (level <= depth)
1047                                 printf("Unknown tag 0x%08X\n", tag);
1048                         return 1;
1049                 }
1050                 nodeoffset = nextoffset;
1051         }
1052         return 0;
1053 }
1054
1055 /********************************************************************/
1056 #ifdef CONFIG_SYS_LONGHELP
1057 static char fdt_help_text[] =
1058         "addr [-c]  <addr> [<length>]   - Set the [control] fdt location to <addr>\n"
1059 #ifdef CONFIG_OF_LIBFDT_OVERLAY
1060         "fdt apply <addr>                    - Apply overlay to the DT\n"
1061 #endif
1062 #ifdef CONFIG_OF_BOARD_SETUP
1063         "fdt boardsetup                      - Do board-specific set up\n"
1064 #endif
1065 #ifdef CONFIG_OF_SYSTEM_SETUP
1066         "fdt systemsetup                     - Do system-specific set up\n"
1067 #endif
1068         "fdt move   <fdt> <newaddr> <length> - Copy the fdt to <addr> and make it active\n"
1069         "fdt resize [<extrasize>]            - Resize fdt to size + padding to 4k addr + some optional <extrasize> if needed\n"
1070         "fdt print  <path> [<prop>]          - Recursive print starting at <path>\n"
1071         "fdt list   <path> [<prop>]          - Print one level starting at <path>\n"
1072         "fdt get value <var> <path> <prop>   - Get <property> and store in <var>\n"
1073         "fdt get name <var> <path> <index>   - Get name of node <index> and store in <var>\n"
1074         "fdt get addr <var> <path> <prop>    - Get start address of <property> and store in <var>\n"
1075         "fdt get size <var> <path> [<prop>]  - Get size of [<property>] or num nodes and store in <var>\n"
1076         "fdt set    <path> <prop> [<val>]    - Set <property> [to <val>]\n"
1077         "fdt mknode <path> <node>            - Create a new node after <path>\n"
1078         "fdt rm     <path> [<prop>]          - Delete the node or <property>\n"
1079         "fdt header [get <var> <member>]     - Display header info\n"
1080         "                                      get - get header member <member> and store it in <var>\n"
1081         "fdt bootcpu <id>                    - Set boot cpuid\n"
1082         "fdt memory <addr> <size>            - Add/Update memory node\n"
1083         "fdt rsvmem print                    - Show current mem reserves\n"
1084         "fdt rsvmem add <addr> <size>        - Add a mem reserve\n"
1085         "fdt rsvmem delete <index>           - Delete a mem reserves\n"
1086         "fdt chosen [<start> <size>]         - Add/update the /chosen branch in the tree\n"
1087         "                                        <start>/<size> - initrd start addr/size\n"
1088 #if defined(CONFIG_FIT_SIGNATURE)
1089         "fdt checksign [<addr>]              - check FIT signature\n"
1090         "                                        <start> - addr of key blob\n"
1091         "                                                  default gd->fdt_blob\n"
1092 #endif
1093         "NOTE: Dereference aliases by omitting the leading '/', "
1094                 "e.g. fdt print ethernet0.";
1095 #endif
1096
1097 U_BOOT_CMD(
1098         fdt,    255,    0,      do_fdt,
1099         "flattened device tree utility commands", fdt_help_text
1100 );