common/image-fdt.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Copyright (c) 2013, Google Inc.
   4  *
   5  * (C) Copyright 2008 Semihalf
   6  *
   7  * (C) Copyright 2000-2006
   8  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
   9  */
  10
  11 #include <common.h>
  12 #include <fdt_support.h>
  13 #include <fdtdec.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 /* adding a ramdisk needs 0x44 bytes in version 2008.10 */
  25 #define FDT_RAMDISK_OVERHEAD    0x80
  26
  27 DECLARE_GLOBAL_DATA_PTR;
  28
  29 static void fdt_error(const char *msg)
  30 {
  31         puts("ERROR: ");
  32         puts(msg);
  33         puts(" - must RESET the board to recover.\n");
  34 }
  35
  36 #if defined(CONFIG_IMAGE_FORMAT_LEGACY)
  37 static const image_header_t *image_get_fdt(ulong fdt_addr)
  38 {
  39         const image_header_t *fdt_hdr = map_sysmem(fdt_addr, 0);
  40
  41         image_print_contents(fdt_hdr);
  42
  43         puts("   Verifying Checksum ... ");
  44         if (!image_check_hcrc(fdt_hdr)) {
  45                 fdt_error("fdt header checksum invalid");
  46                 return NULL;
  47         }
  48
  49         if (!image_check_dcrc(fdt_hdr)) {
  50                 fdt_error("fdt checksum invalid");
  51                 return NULL;
  52         }
  53         puts("OK\n");
  54
  55         if (!image_check_type(fdt_hdr, IH_TYPE_FLATDT)) {
  56                 fdt_error("uImage is not a fdt");
  57                 return NULL;
  58         }
  59         if (image_get_comp(fdt_hdr) != IH_COMP_NONE) {
  60                 fdt_error("uImage is compressed");
  61                 return NULL;
  62         }
  63         if (fdt_check_header((void *)image_get_data(fdt_hdr)) != 0) {
  64                 fdt_error("uImage data is not a fdt");
  65                 return NULL;
  66         }
  67         return fdt_hdr;
  68 }
  69 #endif
  70
  71 static void boot_fdt_reserve_region(struct lmb *lmb, uint64_t addr,
  72                                     uint64_t size)
  73 {
  74         int ret;
  75
  76         ret = lmb_reserve(lmb, addr, size);
  77         if (!ret) {
  78                 debug("   reserving fdt memory region: addr=%llx size=%llx\n",
  79                       (unsigned long long)addr, (unsigned long long)size);
  80         } else {
  81                 puts("ERROR: reserving fdt memory region failed ");
  82                 printf("(addr=%llx size=%llx)\n",
  83                        (unsigned long long)addr, (unsigned long long)size);
  84         }
  85 }
  86
  87 /**
  88  * boot_fdt_add_mem_rsv_regions - Mark the memreserve and reserved-memory
  89  * sections as unusable
  90  * @lmb: pointer to lmb handle, will be used for memory mgmt
  91  * @fdt_blob: pointer to fdt blob base address
  92  *
  93  * Adds the and reserved-memorymemreserve regions in the dtb to the lmb block.
  94  * Adding the memreserve regions prevents u-boot from using them to store the
  95  * initrd or the fdt blob.
  96  */
  97 void boot_fdt_add_mem_rsv_regions(struct lmb *lmb, void *fdt_blob)
  98 {
  99         uint64_t addr, size;
 100         int i, total, ret;
 101         int nodeoffset, subnode;
 102         struct fdt_resource res;
 103
 104         if (fdt_check_header(fdt_blob) != 0)
 105                 return;
 106
 107         /* process memreserve sections */
 108         total = fdt_num_mem_rsv(fdt_blob);
 109         for (i = 0; i < total; i++) {
 110                 if (fdt_get_mem_rsv(fdt_blob, i, &addr, &size) != 0)
 111                         continue;
 112                 boot_fdt_reserve_region(lmb, addr, size);
 113         }
 114
 115         /* process reserved-memory */
 116         nodeoffset = fdt_subnode_offset(fdt_blob, 0, "reserved-memory");
 117         if (nodeoffset >= 0) {
 118                 subnode = fdt_first_subnode(fdt_blob, nodeoffset);
 119                 while (subnode >= 0) {
 120                         /* check if this subnode has a reg property */
 121                         ret = fdt_get_resource(fdt_blob, subnode, "reg", 0,
 122                                                &res);
 123                         if (!ret) {
 124                                 addr = res.start;
 125                                 size = res.end - res.start + 1;
 126                                 boot_fdt_reserve_region(lmb, addr, size);
 127                         }
 128
 129                         subnode = fdt_next_subnode(fdt_blob, subnode);
 130                 }
 131         }
 132 }
 133
 134 /**
 135  * boot_relocate_fdt - relocate flat device tree
 136  * @lmb: pointer to lmb handle, will be used for memory mgmt
 137  * @of_flat_tree: pointer to a char* variable, will hold fdt start address
 138  * @of_size: pointer to a ulong variable, will hold fdt length
 139  *
 140  * boot_relocate_fdt() allocates a region of memory within the bootmap and
 141  * relocates the of_flat_tree into that region, even if the fdt is already in
 142  * the bootmap.  It also expands the size of the fdt by CONFIG_SYS_FDT_PAD
 143  * bytes.
 144  *
 145  * of_flat_tree and of_size are set to final (after relocation) values
 146  *
 147  * returns:
 148  *      0 - success
 149  *      1 - failure
 150  */
 151 int boot_relocate_fdt(struct lmb *lmb, char **of_flat_tree, ulong *of_size)
 152 {
 153         void    *fdt_blob = *of_flat_tree;
 154         void    *of_start = NULL;
 155         char    *fdt_high;
 156         ulong   of_len = 0;
 157         int     err;
 158         int     disable_relocation = 0;
 159
 160         /* nothing to do */
 161         if (*of_size == 0)
 162                 return 0;
 163
 164         if (fdt_check_header(fdt_blob) != 0) {
 165                 fdt_error("image is not a fdt");
 166                 goto error;
 167         }
 168
 169         /* position on a 4K boundary before the alloc_current */
 170         /* Pad the FDT by a specified amount */
 171         of_len = *of_size + CONFIG_SYS_FDT_PAD;
 172
 173         /* If fdt_high is set use it to select the relocation address */
 174         fdt_high = env_get("fdt_high");
 175         if (fdt_high) {
 176                 void *desired_addr = (void *)simple_strtoul(fdt_high, NULL, 16);
 177
 178                 if (((ulong) desired_addr) == ~0UL) {
 179                         /* All ones means use fdt in place */
 180                         of_start = fdt_blob;
 181                         lmb_reserve(lmb, (ulong)of_start, of_len);
 182                         disable_relocation = 1;
 183                 } else if (desired_addr) {
 184                         of_start =
 185                             (void *)(ulong) lmb_alloc_base(lmb, of_len, 0x1000,
 186                                                            (ulong)desired_addr);
 187                         if (of_start == NULL) {
 188                                 puts("Failed using fdt_high value for Device Tree");
 189                                 goto error;
 190                         }
 191                 } else {
 192                         of_start =
 193                             (void *)(ulong) lmb_alloc(lmb, of_len, 0x1000);
 194                 }
 195         } else {
 196                 of_start =
 197                     (void *)(ulong) lmb_alloc_base(lmb, of_len, 0x1000,
 198                                                    env_get_bootm_mapsize()
 199                                                    + env_get_bootm_low());
 200         }
 201
 202         if (of_start == NULL) {
 203                 puts("device tree - allocation error\n");
 204                 goto error;
 205         }
 206
 207         if (disable_relocation) {
 208                 /*
 209                  * We assume there is space after the existing fdt to use
 210                  * for padding
 211                  */
 212                 fdt_set_totalsize(of_start, of_len);
 213                 printf("   Using Device Tree in place at %p, end %p\n",
 214                        of_start, of_start + of_len - 1);
 215         } else {
 216                 debug("## device tree at %p ... %p (len=%ld [0x%lX])\n",
 217                       fdt_blob, fdt_blob + *of_size - 1, of_len, of_len);
 218
 219                 printf("   Loading Device Tree to %p, end %p ... ",
 220                        of_start, of_start + of_len - 1);
 221
 222                 err = fdt_open_into(fdt_blob, of_start, of_len);
 223                 if (err != 0) {
 224                         fdt_error("fdt move failed");
 225                         goto error;
 226                 }
 227                 puts("OK\n");
 228         }
 229
 230         *of_flat_tree = of_start;
 231         *of_size = of_len;
 232
 233         if (CONFIG_IS_ENABLED(CMD_FDT))
 234                 set_working_fdt_addr(map_to_sysmem(*of_flat_tree));
 235         return 0;
 236
 237 error:
 238         return 1;
 239 }
 240
 241 /**
 242  * boot_get_fdt - main fdt handling routine
 243  * @argc: command argument count
 244  * @argv: command argument list
 245  * @arch: architecture (IH_ARCH_...)
 246  * @images: pointer to the bootm images structure
 247  * @of_flat_tree: pointer to a char* variable, will hold fdt start address
 248  * @of_size: pointer to a ulong variable, will hold fdt length
 249  *
 250  * boot_get_fdt() is responsible for finding a valid flat device tree image.
 251  * Curently supported are the following ramdisk sources:
 252  *      - multicomponent kernel/ramdisk image,
 253  *      - commandline provided address of decicated ramdisk image.
 254  *
 255  * returns:
 256  *     0, if fdt image was found and valid, or skipped
 257  *     of_flat_tree and of_size are set to fdt start address and length if
 258  *     fdt image is found and valid
 259  *
 260  *     1, if fdt image is found but corrupted
 261  *     of_flat_tree and of_size are set to 0 if no fdt exists
 262  */
 263 int boot_get_fdt(int flag, int argc, char * const argv[], uint8_t arch,
 264                 bootm_headers_t *images, char **of_flat_tree, ulong *of_size)
 265 {
 266 #if defined(CONFIG_IMAGE_FORMAT_LEGACY)
 267         const image_header_t *fdt_hdr;
 268         ulong           load, load_end;
 269         ulong           image_start, image_data, image_end;
 270 #endif
 271         ulong           fdt_addr;
 272         char            *fdt_blob = NULL;
 273         void            *buf;
 274 #if CONFIG_IS_ENABLED(FIT)
 275         const char      *fit_uname_config = images->fit_uname_cfg;
 276         const char      *fit_uname_fdt = NULL;
 277         ulong           default_addr;
 278         int             fdt_noffset;
 279 #endif
 280         const char *select = NULL;
 281         int             ok_no_fdt = 0;
 282
 283         *of_flat_tree = NULL;
 284         *of_size = 0;
 285
 286         if (argc > 2)
 287                 select = argv[2];
 288         if (select || genimg_has_config(images)) {
 289 #if CONFIG_IS_ENABLED(FIT)
 290                 if (select) {
 291                         /*
 292                          * If the FDT blob comes from the FIT image and the
 293                          * FIT image address is omitted in the command line
 294                          * argument, try to use ramdisk or os FIT image
 295                          * address or default load address.
 296                          */
 297                         if (images->fit_uname_rd)
 298                                 default_addr = (ulong)images->fit_hdr_rd;
 299                         else if (images->fit_uname_os)
 300                                 default_addr = (ulong)images->fit_hdr_os;
 301                         else
 302                                 default_addr = load_addr;
 303
 304                         if (fit_parse_conf(select, default_addr,
 305                                            &fdt_addr, &fit_uname_config)) {
 306                                 debug("*  fdt: config '%s' from image at 0x%08lx\n",
 307                                       fit_uname_config, fdt_addr);
 308                         } else if (fit_parse_subimage(select, default_addr,
 309                                    &fdt_addr, &fit_uname_fdt)) {
 310                                 debug("*  fdt: subimage '%s' from image at 0x%08lx\n",
 311                                       fit_uname_fdt, fdt_addr);
 312                         } else
 313 #endif
 314                         {
 315                                 fdt_addr = simple_strtoul(select, NULL, 16);
 316                                 debug("*  fdt: cmdline image address = 0x%08lx\n",
 317                                       fdt_addr);
 318                         }
 319 #if CONFIG_IS_ENABLED(FIT)
 320                 } else {
 321                         /* use FIT configuration provided in first bootm
 322                          * command argument
 323                          */
 324                         fdt_addr = map_to_sysmem(images->fit_hdr_os);
 325                         fdt_noffset = fit_get_node_from_config(images,
 326                                                                FIT_FDT_PROP,
 327                                                                fdt_addr);
 328                         if (fdt_noffset == -ENOENT)
 329                                 return 0;
 330                         else if (fdt_noffset < 0)
 331                                 return 1;
 332                 }
 333 #endif
 334                 debug("## Checking for 'FDT'/'FDT Image' at %08lx\n",
 335                       fdt_addr);
 336
 337                 /*
 338                  * Check if there is an FDT image at the
 339                  * address provided in the second bootm argument
 340                  * check image type, for FIT images get a FIT node.
 341                  */
 342                 buf = map_sysmem(fdt_addr, 0);
 343                 switch (genimg_get_format(buf)) {
 344 #if defined(CONFIG_IMAGE_FORMAT_LEGACY)
 345                 case IMAGE_FORMAT_LEGACY:
 346                         /* verify fdt_addr points to a valid image header */
 347                         printf("## Flattened Device Tree from Legacy Image at %08lx\n",
 348                                fdt_addr);
 349                         fdt_hdr = image_get_fdt(fdt_addr);
 350                         if (!fdt_hdr)
 351                                 goto no_fdt;
 352
 353                         /*
 354                          * move image data to the load address,
 355                          * make sure we don't overwrite initial image
 356                          */
 357                         image_start = (ulong)fdt_hdr;
 358                         image_data = (ulong)image_get_data(fdt_hdr);
 359                         image_end = image_get_image_end(fdt_hdr);
 360
 361                         load = image_get_load(fdt_hdr);
 362                         load_end = load + image_get_data_size(fdt_hdr);
 363
 364                         if (load == image_start ||
 365                             load == image_data) {
 366                                 fdt_addr = load;
 367                                 break;
 368                         }
 369
 370                         if ((load < image_end) && (load_end > image_start)) {
 371                                 fdt_error("fdt overwritten");
 372                                 goto error;
 373                         }
 374
 375                         debug("   Loading FDT from 0x%08lx to 0x%08lx\n",
 376                               image_data, load);
 377
 378                         memmove((void *)load,
 379                                 (void *)image_data,
 380                                 image_get_data_size(fdt_hdr));
 381
 382                         fdt_addr = load;
 383                         break;
 384 #endif
 385                 case IMAGE_FORMAT_FIT:
 386                         /*
 387                          * This case will catch both: new uImage format
 388                          * (libfdt based) and raw FDT blob (also libfdt
 389                          * based).
 390                          */
 391 #if CONFIG_IS_ENABLED(FIT)
 392                         /* check FDT blob vs FIT blob */
 393                         if (fit_check_format(buf)) {
 394                                 ulong load, len;
 395
 396                                 fdt_noffset = boot_get_fdt_fit(images,
 397                                         fdt_addr, &fit_uname_fdt,
 398                                         &fit_uname_config,
 399                                         arch, &load, &len);
 400
 401                                 images->fit_hdr_fdt = map_sysmem(fdt_addr, 0);
 402                                 images->fit_uname_fdt = fit_uname_fdt;
 403                                 images->fit_noffset_fdt = fdt_noffset;
 404                                 fdt_addr = load;
 405
 406                                 break;
 407                         } else
 408 #endif
 409                         {
 410                                 /*
 411                                  * FDT blob
 412                                  */
 413                                 debug("*  fdt: raw FDT blob\n");
 414                                 printf("## Flattened Device Tree blob at %08lx\n",
 415                                        (long)fdt_addr);
 416                         }
 417                         break;
 418                 default:
 419                         puts("ERROR: Did not find a cmdline Flattened Device Tree\n");
 420                         goto no_fdt;
 421                 }
 422
 423                 printf("   Booting using the fdt blob at %#08lx\n", fdt_addr);
 424                 fdt_blob = map_sysmem(fdt_addr, 0);
 425         } else if (images->legacy_hdr_valid &&
 426                         image_check_type(&images->legacy_hdr_os_copy,
 427                                          IH_TYPE_MULTI)) {
 428                 ulong fdt_data, fdt_len;
 429
 430                 /*
 431                  * Now check if we have a legacy multi-component image,
 432                  * get second entry data start address and len.
 433                  */
 434                 printf("## Flattened Device Tree from multi component Image at %08lX\n",
 435                        (ulong)images->legacy_hdr_os);
 436
 437                 image_multi_getimg(images->legacy_hdr_os, 2, &fdt_data,
 438                                    &fdt_len);
 439                 if (fdt_len) {
 440                         fdt_blob = (char *)fdt_data;
 441                         printf("   Booting using the fdt at 0x%p\n", fdt_blob);
 442
 443                         if (fdt_check_header(fdt_blob) != 0) {
 444                                 fdt_error("image is not a fdt");
 445                                 goto error;
 446                         }
 447
 448                         if (fdt_totalsize(fdt_blob) != fdt_len) {
 449                                 fdt_error("fdt size != image size");
 450                                 goto error;
 451                         }
 452                 } else {
 453                         debug("## No Flattened Device Tree\n");
 454                         goto no_fdt;
 455                 }
 456         } else {
 457                 debug("## No Flattened Device Tree\n");
 458                 goto no_fdt;
 459         }
 460
 461         *of_flat_tree = fdt_blob;
 462         *of_size = fdt_totalsize(fdt_blob);
 463         debug("   of_flat_tree at 0x%08lx size 0x%08lx\n",
 464               (ulong)*of_flat_tree, *of_size);
 465
 466         return 0;
 467
 468 no_fdt:
 469         ok_no_fdt = 1;
 470 error:
 471         *of_flat_tree = NULL;
 472         *of_size = 0;
 473         if (!select && ok_no_fdt) {
 474                 debug("Continuing to boot without FDT\n");
 475                 return 0;
 476         }
 477         return 1;
 478 }
 479
 480 /*
 481  * Verify the device tree.
 482  *
 483  * This function is called after all device tree fix-ups have been enacted,
 484  * so that the final device tree can be verified.  The definition of "verified"
 485  * is up to the specific implementation.  However, it generally means that the
 486  * addresses of some of the devices in the device tree are compared with the
 487  * actual addresses at which U-Boot has placed them.
 488  *
 489  * Returns 1 on success, 0 on failure.  If 0 is returned, U-Boot will halt the
 490  * boot process.
 491  */
 492 __weak int ft_verify_fdt(void *fdt)
 493 {
 494         return 1;
 495 }
 496
 497 __weak int arch_fixup_fdt(void *blob)
 498 {
 499         return 0;
 500 }
 501
 502 int image_setup_libfdt(bootm_headers_t *images, void *blob,
 503                        int of_size, struct lmb *lmb)
 504 {
 505         ulong *initrd_start = &images->initrd_start;
 506         ulong *initrd_end = &images->initrd_end;
 507         int ret = -EPERM;
 508         int fdt_ret;
 509
 510         if (fdt_root(blob) < 0) {
 511                 printf("ERROR: root node setup failed\n");
 512                 goto err;
 513         }
 514         if (fdt_chosen(blob) < 0) {
 515                 printf("ERROR: /chosen node create failed\n");
 516                 goto err;
 517         }
 518         if (arch_fixup_fdt(blob) < 0) {
 519                 printf("ERROR: arch-specific fdt fixup failed\n");
 520                 goto err;
 521         }
 522         /* Update ethernet nodes */
 523         fdt_fixup_ethernet(blob);
 524         if (IMAGE_OF_BOARD_SETUP) {
 525                 fdt_ret = ft_board_setup(blob, gd->bd);
 526                 if (fdt_ret) {
 527                         printf("ERROR: board-specific fdt fixup failed: %s\n",
 528                                fdt_strerror(fdt_ret));
 529                         goto err;
 530                 }
 531         }
 532         if (IMAGE_OF_SYSTEM_SETUP) {
 533                 fdt_ret = ft_system_setup(blob, gd->bd);
 534                 if (fdt_ret) {
 535                         printf("ERROR: system-specific fdt fixup failed: %s\n",
 536                                fdt_strerror(fdt_ret));
 537                         goto err;
 538                 }
 539         }
 540
 541         /* Delete the old LMB reservation */
 542         if (lmb)
 543                 lmb_free(lmb, (phys_addr_t)(u32)(uintptr_t)blob,
 544                          (phys_size_t)fdt_totalsize(blob));
 545
 546         ret = fdt_shrink_to_minimum(blob, 0);
 547         if (ret < 0)
 548                 goto err;
 549         of_size = ret;
 550
 551         if (*initrd_start && *initrd_end) {
 552                 of_size += FDT_RAMDISK_OVERHEAD;
 553                 fdt_set_totalsize(blob, of_size);
 554         }
 555         /* Create a new LMB reservation */
 556         if (lmb)
 557                 lmb_reserve(lmb, (ulong)blob, of_size);
 558
 559         fdt_initrd(blob, *initrd_start, *initrd_end);
 560         if (!ft_verify_fdt(blob))
 561                 goto err;
 562
 563 #if defined(CONFIG_SOC_KEYSTONE)
 564         if (IMAGE_OF_BOARD_SETUP)
 565                 ft_board_setup_ex(blob, gd->bd);
 566 #endif
 567
 568         return 0;
 569 err:
 570         printf(" - must RESET the board to recover.\n\n");
 571
 572         return ret;
 573 }