common/image-fdt.c

   1 /*
   2  * Copyright (c) 2013, Google Inc.
   3  *
   4  * (C) Copyright 2008 Semihalf
   5  *
   6  * (C) Copyright 2000-2006
   7  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
   8  *
   9  * SPDX-License-Identifier:     GPL-2.0+
  10  */
  11
  12 #include <common.h>
  13 #include <fdt_support.h>
  14 #include <errno.h>
  15 #include <image.h>
  16 #include <linux/libfdt.h>
  17 #include <mapmem.h>
  18 #include <asm/io.h>
  19
  20 #ifndef CONFIG_SYS_FDT_PAD
  21 #define CONFIG_SYS_FDT_PAD 0x3000
  22 #endif
  23
  24 DECLARE_GLOBAL_DATA_PTR;
  25
  26 static void fdt_error(const char *msg)
  27 {
  28         puts("ERROR: ");
  29         puts(msg);
  30         puts(" - must RESET the board to recover.\n");
  31 }
  32
  33 #if defined(CONFIG_IMAGE_FORMAT_LEGACY)
  34 static const image_header_t *image_get_fdt(ulong fdt_addr)
  35 {
  36         const image_header_t *fdt_hdr = map_sysmem(fdt_addr, 0);
  37
  38         image_print_contents(fdt_hdr);
  39
  40         puts("   Verifying Checksum ... ");
  41         if (!image_check_hcrc(fdt_hdr)) {
  42                 fdt_error("fdt header checksum invalid");
  43                 return NULL;
  44         }
  45
  46         if (!image_check_dcrc(fdt_hdr)) {
  47                 fdt_error("fdt checksum invalid");
  48                 return NULL;
  49         }
  50         puts("OK\n");
  51
  52         if (!image_check_type(fdt_hdr, IH_TYPE_FLATDT)) {
  53                 fdt_error("uImage is not a fdt");
  54                 return NULL;
  55         }
  56         if (image_get_comp(fdt_hdr) != IH_COMP_NONE) {
  57                 fdt_error("uImage is compressed");
  58                 return NULL;
  59         }
  60         if (fdt_check_header((void *)image_get_data(fdt_hdr)) != 0) {
  61                 fdt_error("uImage data is not a fdt");
  62                 return NULL;
  63         }
  64         return fdt_hdr;
  65 }
  66 #endif
  67
  68 /**
  69  * boot_fdt_add_mem_rsv_regions - Mark the memreserve sections as unusable
  70  * @lmb: pointer to lmb handle, will be used for memory mgmt
  71  * @fdt_blob: pointer to fdt blob base address
  72  *
  73  * Adds the memreserve regions in the dtb to the lmb block.  Adding the
  74  * memreserve regions prevents u-boot from using them to store the initrd
  75  * or the fdt blob.
  76  */
  77 void boot_fdt_add_mem_rsv_regions(struct lmb *lmb, void *fdt_blob)
  78 {
  79         uint64_t addr, size;
  80         int i, total;
  81
  82         if (fdt_check_header(fdt_blob) != 0)
  83                 return;
  84
  85         total = fdt_num_mem_rsv(fdt_blob);
  86         for (i = 0; i < total; i++) {
  87                 if (fdt_get_mem_rsv(fdt_blob, i, &addr, &size) != 0)
  88                         continue;
  89                 printf("   reserving fdt memory region: addr=%llx size=%llx\n",
  90                        (unsigned long long)addr, (unsigned long long)size);
  91                 lmb_reserve(lmb, addr, size);
  92         }
  93 }
  94
  95 /**
  96  * boot_relocate_fdt - relocate flat device tree
  97  * @lmb: pointer to lmb handle, will be used for memory mgmt
  98  * @of_flat_tree: pointer to a char* variable, will hold fdt start address
  99  * @of_size: pointer to a ulong variable, will hold fdt length
 100  *
 101  * boot_relocate_fdt() allocates a region of memory within the bootmap and
 102  * relocates the of_flat_tree into that region, even if the fdt is already in
 103  * the bootmap.  It also expands the size of the fdt by CONFIG_SYS_FDT_PAD
 104  * bytes.
 105  *
 106  * of_flat_tree and of_size are set to final (after relocation) values
 107  *
 108  * returns:
 109  *      0 - success
 110  *      1 - failure
 111  */
 112 int boot_relocate_fdt(struct lmb *lmb, char **of_flat_tree, ulong *of_size)
 113 {
 114         void    *fdt_blob = *of_flat_tree;
 115         void    *of_start = NULL;
 116         char    *fdt_high;
 117         ulong   of_len = 0;
 118         int     err;
 119         int     disable_relocation = 0;
 120
 121         /* nothing to do */
 122         if (*of_size == 0)
 123                 return 0;
 124
 125         if (fdt_check_header(fdt_blob) != 0) {
 126                 fdt_error("image is not a fdt");
 127                 goto error;
 128         }
 129
 130         /* position on a 4K boundary before the alloc_current */
 131         /* Pad the FDT by a specified amount */
 132         of_len = *of_size + CONFIG_SYS_FDT_PAD;
 133
 134         /* If fdt_high is set use it to select the relocation address */
 135         fdt_high = env_get("fdt_high");
 136         if (fdt_high) {
 137                 void *desired_addr = (void *)simple_strtoul(fdt_high, NULL, 16);
 138
 139                 if (((ulong) desired_addr) == ~0UL) {
 140                         /* All ones means use fdt in place */
 141                         of_start = fdt_blob;
 142                         lmb_reserve(lmb, (ulong)of_start, of_len);
 143                         disable_relocation = 1;
 144                 } else if (desired_addr) {
 145                         of_start =
 146                             (void *)(ulong) lmb_alloc_base(lmb, of_len, 0x1000,
 147                                                            (ulong)desired_addr);
 148                         if (of_start == NULL) {
 149                                 puts("Failed using fdt_high value for Device Tree");
 150                                 goto error;
 151                         }
 152                 } else {
 153                         of_start =
 154                             (void *)(ulong) lmb_alloc(lmb, of_len, 0x1000);
 155                 }
 156         } else {
 157                 of_start =
 158                     (void *)(ulong) lmb_alloc_base(lmb, of_len, 0x1000,
 159                                                    env_get_bootm_mapsize()
 160                                                    + env_get_bootm_low());
 161         }
 162
 163         if (of_start == NULL) {
 164                 puts("device tree - allocation error\n");
 165                 goto error;
 166         }
 167
 168         if (disable_relocation) {
 169                 /*
 170                  * We assume there is space after the existing fdt to use
 171                  * for padding
 172                  */
 173                 fdt_set_totalsize(of_start, of_len);
 174                 printf("   Using Device Tree in place at %p, end %p\n",
 175                        of_start, of_start + of_len - 1);
 176         } else {
 177                 debug("## device tree at %p ... %p (len=%ld [0x%lX])\n",
 178                       fdt_blob, fdt_blob + *of_size - 1, of_len, of_len);
 179
 180                 printf("   Loading Device Tree to %p, end %p ... ",
 181                        of_start, of_start + of_len - 1);
 182
 183                 err = fdt_open_into(fdt_blob, of_start, of_len);
 184                 if (err != 0) {
 185                         fdt_error("fdt move failed");
 186                         goto error;
 187                 }
 188                 puts("OK\n");
 189         }
 190
 191         *of_flat_tree = of_start;
 192         *of_size = of_len;
 193
 194         set_working_fdt_addr((ulong)*of_flat_tree);
 195         return 0;
 196
 197 error:
 198         return 1;
 199 }
 200
 201 /**
 202  * boot_get_fdt - main fdt handling routine
 203  * @argc: command argument count
 204  * @argv: command argument list
 205  * @arch: architecture (IH_ARCH_...)
 206  * @images: pointer to the bootm images structure
 207  * @of_flat_tree: pointer to a char* variable, will hold fdt start address
 208  * @of_size: pointer to a ulong variable, will hold fdt length
 209  *
 210  * boot_get_fdt() is responsible for finding a valid flat device tree image.
 211  * Curently supported are the following ramdisk sources:
 212  *      - multicomponent kernel/ramdisk image,
 213  *      - commandline provided address of decicated ramdisk image.
 214  *
 215  * returns:
 216  *     0, if fdt image was found and valid, or skipped
 217  *     of_flat_tree and of_size are set to fdt start address and length if
 218  *     fdt image is found and valid
 219  *
 220  *     1, if fdt image is found but corrupted
 221  *     of_flat_tree and of_size are set to 0 if no fdt exists
 222  */
 223 int boot_get_fdt(int flag, int argc, char * const argv[], uint8_t arch,
 224                 bootm_headers_t *images, char **of_flat_tree, ulong *of_size)
 225 {
 226 #if defined(CONFIG_IMAGE_FORMAT_LEGACY)
 227         const image_header_t *fdt_hdr;
 228         ulong           load, load_end;
 229         ulong           image_start, image_data, image_end;
 230 #endif
 231         ulong           fdt_addr;
 232         char            *fdt_blob = NULL;
 233         void            *buf;
 234 #if CONFIG_IS_ENABLED(FIT)
 235         const char      *fit_uname_config = images->fit_uname_cfg;
 236         const char      *fit_uname_fdt = NULL;
 237         ulong           default_addr;
 238         int             fdt_noffset;
 239 #endif
 240         const char *select = NULL;
 241         int             ok_no_fdt = 0;
 242
 243         *of_flat_tree = NULL;
 244         *of_size = 0;
 245
 246         if (argc > 2)
 247                 select = argv[2];
 248         if (select || genimg_has_config(images)) {
 249 #if CONFIG_IS_ENABLED(FIT)
 250                 if (select) {
 251                         /*
 252                          * If the FDT blob comes from the FIT image and the
 253                          * FIT image address is omitted in the command line
 254                          * argument, try to use ramdisk or os FIT image
 255                          * address or default load address.
 256                          */
 257                         if (images->fit_uname_rd)
 258                                 default_addr = (ulong)images->fit_hdr_rd;
 259                         else if (images->fit_uname_os)
 260                                 default_addr = (ulong)images->fit_hdr_os;
 261                         else
 262                                 default_addr = load_addr;
 263
 264                         if (fit_parse_conf(select, default_addr,
 265                                            &fdt_addr, &fit_uname_config)) {
 266                                 debug("*  fdt: config '%s' from image at 0x%08lx\n",
 267                                       fit_uname_config, fdt_addr);
 268                         } else if (fit_parse_subimage(select, default_addr,
 269                                    &fdt_addr, &fit_uname_fdt)) {
 270                                 debug("*  fdt: subimage '%s' from image at 0x%08lx\n",
 271                                       fit_uname_fdt, fdt_addr);
 272                         } else
 273 #endif
 274                         {
 275                                 fdt_addr = simple_strtoul(select, NULL, 16);
 276                                 debug("*  fdt: cmdline image address = 0x%08lx\n",
 277                                       fdt_addr);
 278                         }
 279 #if CONFIG_IS_ENABLED(FIT)
 280                 } else {
 281                         /* use FIT configuration provided in first bootm
 282                          * command argument
 283                          */
 284                         fdt_addr = map_to_sysmem(images->fit_hdr_os);
 285                         fdt_noffset = fit_get_node_from_config(images,
 286                                                                FIT_FDT_PROP,
 287                                                                fdt_addr);
 288                         if (fdt_noffset == -ENOENT)
 289                                 return 0;
 290                         else if (fdt_noffset < 0)
 291                                 return 1;
 292                 }
 293 #endif
 294                 debug("## Checking for 'FDT'/'FDT Image' at %08lx\n",
 295                       fdt_addr);
 296
 297                 /*
 298                  * Check if there is an FDT image at the
 299                  * address provided in the second bootm argument
 300                  * check image type, for FIT images get a FIT node.
 301                  */
 302                 buf = map_sysmem(fdt_addr, 0);
 303                 switch (genimg_get_format(buf)) {
 304 #if defined(CONFIG_IMAGE_FORMAT_LEGACY)
 305                 case IMAGE_FORMAT_LEGACY:
 306                         /* verify fdt_addr points to a valid image header */
 307                         printf("## Flattened Device Tree from Legacy Image at %08lx\n",
 308                                fdt_addr);
 309                         fdt_hdr = image_get_fdt(fdt_addr);
 310                         if (!fdt_hdr)
 311                                 goto no_fdt;
 312
 313                         /*
 314                          * move image data to the load address,
 315                          * make sure we don't overwrite initial image
 316                          */
 317                         image_start = (ulong)fdt_hdr;
 318                         image_data = (ulong)image_get_data(fdt_hdr);
 319                         image_end = image_get_image_end(fdt_hdr);
 320
 321                         load = image_get_load(fdt_hdr);
 322                         load_end = load + image_get_data_size(fdt_hdr);
 323
 324                         if (load == image_start ||
 325                             load == image_data) {
 326                                 fdt_addr = load;
 327                                 break;
 328                         }
 329
 330                         if ((load < image_end) && (load_end > image_start)) {
 331                                 fdt_error("fdt overwritten");
 332                                 goto error;
 333                         }
 334
 335                         debug("   Loading FDT from 0x%08lx to 0x%08lx\n",
 336                               image_data, load);
 337
 338                         memmove((void *)load,
 339                                 (void *)image_data,
 340                                 image_get_data_size(fdt_hdr));
 341
 342                         fdt_addr = load;
 343                         break;
 344 #endif
 345                 case IMAGE_FORMAT_FIT:
 346                         /*
 347                          * This case will catch both: new uImage format
 348                          * (libfdt based) and raw FDT blob (also libfdt
 349                          * based).
 350                          */
 351 #if CONFIG_IS_ENABLED(FIT)
 352                         /* check FDT blob vs FIT blob */
 353                         if (fit_check_format(buf)) {
 354                                 ulong load, len;
 355
 356                                 fdt_noffset = boot_get_fdt_fit(images,
 357                                         fdt_addr, &fit_uname_fdt,
 358                                         &fit_uname_config,
 359                                         arch, &load, &len);
 360
 361                                 images->fit_hdr_fdt = map_sysmem(fdt_addr, 0);
 362                                 images->fit_uname_fdt = fit_uname_fdt;
 363                                 images->fit_noffset_fdt = fdt_noffset;
 364                                 fdt_addr = load;
 365
 366                                 break;
 367                         } else
 368 #endif
 369                         {
 370                                 /*
 371                                  * FDT blob
 372                                  */
 373                                 debug("*  fdt: raw FDT blob\n");
 374                                 printf("## Flattened Device Tree blob at %08lx\n",
 375                                        (long)fdt_addr);
 376                         }
 377                         break;
 378                 default:
 379                         puts("ERROR: Did not find a cmdline Flattened Device Tree\n");
 380                         goto no_fdt;
 381                 }
 382
 383                 printf("   Booting using the fdt blob at %#08lx\n", fdt_addr);
 384                 fdt_blob = map_sysmem(fdt_addr, 0);
 385         } else if (images->legacy_hdr_valid &&
 386                         image_check_type(&images->legacy_hdr_os_copy,
 387                                          IH_TYPE_MULTI)) {
 388                 ulong fdt_data, fdt_len;
 389
 390                 /*
 391                  * Now check if we have a legacy multi-component image,
 392                  * get second entry data start address and len.
 393                  */
 394                 printf("## Flattened Device Tree from multi component Image at %08lX\n",
 395                        (ulong)images->legacy_hdr_os);
 396
 397                 image_multi_getimg(images->legacy_hdr_os, 2, &fdt_data,
 398                                    &fdt_len);
 399                 if (fdt_len) {
 400                         fdt_blob = (char *)fdt_data;
 401                         printf("   Booting using the fdt at 0x%p\n", fdt_blob);
 402
 403                         if (fdt_check_header(fdt_blob) != 0) {
 404                                 fdt_error("image is not a fdt");
 405                                 goto error;
 406                         }
 407
 408                         if (fdt_totalsize(fdt_blob) != fdt_len) {
 409                                 fdt_error("fdt size != image size");
 410                                 goto error;
 411                         }
 412                 } else {
 413                         debug("## No Flattened Device Tree\n");
 414                         goto no_fdt;
 415                 }
 416         } else {
 417                 debug("## No Flattened Device Tree\n");
 418                 goto no_fdt;
 419         }
 420
 421         *of_flat_tree = fdt_blob;
 422         *of_size = fdt_totalsize(fdt_blob);
 423         debug("   of_flat_tree at 0x%08lx size 0x%08lx\n",
 424               (ulong)*of_flat_tree, *of_size);
 425
 426         return 0;
 427
 428 no_fdt:
 429         ok_no_fdt = 1;
 430 error:
 431         *of_flat_tree = NULL;
 432         *of_size = 0;
 433         if (!select && ok_no_fdt) {
 434                 debug("Continuing to boot without FDT\n");
 435                 return 0;
 436         }
 437         return 1;
 438 }
 439
 440 /*
 441  * Verify the device tree.
 442  *
 443  * This function is called after all device tree fix-ups have been enacted,
 444  * so that the final device tree can be verified.  The definition of "verified"
 445  * is up to the specific implementation.  However, it generally means that the
 446  * addresses of some of the devices in the device tree are compared with the
 447  * actual addresses at which U-Boot has placed them.
 448  *
 449  * Returns 1 on success, 0 on failure.  If 0 is returned, U-Boot will halt the
 450  * boot process.
 451  */
 452 __weak int ft_verify_fdt(void *fdt)
 453 {
 454         return 1;
 455 }
 456
 457 __weak int arch_fixup_fdt(void *blob)
 458 {
 459         return 0;
 460 }
 461
 462 int image_setup_libfdt(bootm_headers_t *images, void *blob,
 463                        int of_size, struct lmb *lmb)
 464 {
 465         ulong *initrd_start = &images->initrd_start;
 466         ulong *initrd_end = &images->initrd_end;
 467         int ret = -EPERM;
 468         int fdt_ret;
 469
 470         if (fdt_root(blob) < 0) {
 471                 printf("ERROR: root node setup failed\n");
 472                 goto err;
 473         }
 474         if (fdt_chosen(blob) < 0) {
 475                 printf("ERROR: /chosen node create failed\n");
 476                 goto err;
 477         }
 478         if (arch_fixup_fdt(blob) < 0) {
 479                 printf("ERROR: arch-specific fdt fixup failed\n");
 480                 goto err;
 481         }
 482         /* Update ethernet nodes */
 483         fdt_fixup_ethernet(blob);
 484         if (IMAGE_OF_BOARD_SETUP) {
 485                 fdt_ret = ft_board_setup(blob, gd->bd);
 486                 if (fdt_ret) {
 487                         printf("ERROR: board-specific fdt fixup failed: %s\n",
 488                                fdt_strerror(fdt_ret));
 489                         goto err;
 490                 }
 491         }
 492         if (IMAGE_OF_SYSTEM_SETUP) {
 493                 fdt_ret = ft_system_setup(blob, gd->bd);
 494                 if (fdt_ret) {
 495                         printf("ERROR: system-specific fdt fixup failed: %s\n",
 496                                fdt_strerror(fdt_ret));
 497                         goto err;
 498                 }
 499         }
 500
 501         /* Delete the old LMB reservation */
 502         if (lmb)
 503                 lmb_free(lmb, (phys_addr_t)(u32)(uintptr_t)blob,
 504                          (phys_size_t)fdt_totalsize(blob));
 505
 506         ret = fdt_shrink_to_minimum(blob, 0);
 507         if (ret < 0)
 508                 goto err;
 509         of_size = ret;
 510
 511         if (*initrd_start && *initrd_end) {
 512                 of_size += FDT_RAMDISK_OVERHEAD;
 513                 fdt_set_totalsize(blob, of_size);
 514         }
 515         /* Create a new LMB reservation */
 516         if (lmb)
 517                 lmb_reserve(lmb, (ulong)blob, of_size);
 518
 519         fdt_initrd(blob, *initrd_start, *initrd_end);
 520         if (!ft_verify_fdt(blob))
 521                 goto err;
 522
 523 #if defined(CONFIG_SOC_KEYSTONE)
 524         if (IMAGE_OF_BOARD_SETUP)
 525                 ft_board_setup_ex(blob, gd->bd);
 526 #endif
 527
 528         return 0;
 529 err:
 530         printf(" - must RESET the board to recover.\n\n");
 531
 532         return ret;
 533 }