1 /* 2 * (C) Copyright 2007 3 * Gerald Van Baren, Custom IDEAS, vanbaren@cideas.com 4 * 5 * Copyright 2010-2011 Freescale Semiconductor, Inc. 6 * 7 * SPDX-License-Identifier: GPL-2.0+ 8 */ 9 10 #include <common.h> 11 #include <stdio_dev.h> 12 #include <linux/ctype.h> 13 #include <linux/types.h> 14 #include <asm/global_data.h> 15 #include <libfdt.h> 16 #include <fdt_support.h> 17 #include <exports.h> 18 19 /* 20 * Get cells len in bytes 21 * if #NNNN-cells property is 2 then len is 8 22 * otherwise len is 4 23 */ 24 static int get_cells_len(void *blob, char *nr_cells_name) 25 { 26 const fdt32_t *cell; 27 28 cell = fdt_getprop(blob, 0, nr_cells_name, NULL); 29 if (cell && fdt32_to_cpu(*cell) == 2) 30 return 8; 31 32 return 4; 33 } 34 35 /* 36 * Write a 4 or 8 byte big endian cell 37 */ 38 static void write_cell(u8 *addr, u64 val, int size) 39 { 40 int shift = (size - 1) * 8; 41 while (size-- > 0) { 42 *addr++ = (val >> shift) & 0xff; 43 shift -= 8; 44 } 45 } 46 47 /** 48 * fdt_getprop_u32_default_node - Return a node's property or a default 49 * 50 * @fdt: ptr to device tree 51 * @off: offset of node 52 * @cell: cell offset in property 53 * @prop: property name 54 * @dflt: default value if the property isn't found 55 * 56 * Convenience function to return a node's property or a default value if 57 * the property doesn't exist. 58 */ 59 u32 fdt_getprop_u32_default_node(const void *fdt, int off, int cell, 60 const char *prop, const u32 dflt) 61 { 62 const fdt32_t *val; 63 int len; 64 65 val = fdt_getprop(fdt, off, prop, &len); 66 67 /* Check if property exists */ 68 if (!val) 69 return dflt; 70 71 /* Check if property is long enough */ 72 if (len < ((cell + 1) * sizeof(uint32_t))) 73 return dflt; 74 75 return fdt32_to_cpu(*val); 76 } 77 78 /** 79 * fdt_getprop_u32_default - Find a node and return it's property or a default 80 * 81 * @fdt: ptr to device tree 82 * @path: path of node 83 * @prop: property name 84 * @dflt: default value if the property isn't found 85 * 86 * Convenience function to find a node and return it's property or a 87 * default value if it doesn't exist. 88 */ 89 u32 fdt_getprop_u32_default(const void *fdt, const char *path, 90 const char *prop, const u32 dflt) 91 { 92 int off; 93 94 off = fdt_path_offset(fdt, path); 95 if (off < 0) 96 return dflt; 97 98 return fdt_getprop_u32_default_node(fdt, off, 0, prop, dflt); 99 } 100 101 /** 102 * fdt_find_and_setprop: Find a node and set it's property 103 * 104 * @fdt: ptr to device tree 105 * @node: path of node 106 * @prop: property name 107 * @val: ptr to new value 108 * @len: length of new property value 109 * @create: flag to create the property if it doesn't exist 110 * 111 * Convenience function to directly set a property given the path to the node. 112 */ 113 int fdt_find_and_setprop(void *fdt, const char *node, const char *prop, 114 const void *val, int len, int create) 115 { 116 int nodeoff = fdt_path_offset(fdt, node); 117 118 if (nodeoff < 0) 119 return nodeoff; 120 121 if ((!create) && (fdt_get_property(fdt, nodeoff, prop, NULL) == NULL)) 122 return 0; /* create flag not set; so exit quietly */ 123 124 return fdt_setprop(fdt, nodeoff, prop, val, len); 125 } 126 127 /** 128 * fdt_find_or_add_subnode - find or possibly add a subnode of a given node 129 * @fdt: pointer to the device tree blob 130 * @parentoffset: structure block offset of a node 131 * @name: name of the subnode to locate 132 * 133 * fdt_subnode_offset() finds a subnode of the node with a given name. 134 * If the subnode does not exist, it will be created. 135 */ 136 static int fdt_find_or_add_subnode(void *fdt, int parentoffset, 137 const char *name) 138 { 139 int offset; 140 141 offset = fdt_subnode_offset(fdt, parentoffset, name); 142 143 if (offset == -FDT_ERR_NOTFOUND) 144 offset = fdt_add_subnode(fdt, parentoffset, name); 145 146 if (offset < 0) 147 printf("%s: %s: %s\n", __func__, name, fdt_strerror(offset)); 148 149 return offset; 150 } 151 152 #ifdef CONFIG_OF_STDOUT_VIA_ALIAS 153 154 #ifdef CONFIG_CONS_INDEX 155 static void fdt_fill_multisername(char *sername, size_t maxlen) 156 { 157 const char *outname = stdio_devices[stdout]->name; 158 159 if (strcmp(outname, "serial") > 0) 160 strncpy(sername, outname, maxlen); 161 162 /* eserial? */ 163 if (strcmp(outname + 1, "serial") > 0) 164 strncpy(sername, outname + 1, maxlen); 165 } 166 #endif 167 168 static int fdt_fixup_stdout(void *fdt, int chosenoff) 169 { 170 int err = 0; 171 #ifdef CONFIG_CONS_INDEX 172 int node; 173 char sername[9] = { 0 }; 174 const char *path; 175 176 fdt_fill_multisername(sername, sizeof(sername) - 1); 177 if (!sername[0]) 178 sprintf(sername, "serial%d", CONFIG_CONS_INDEX - 1); 179 180 err = node = fdt_path_offset(fdt, "/aliases"); 181 if (node >= 0) { 182 int len; 183 path = fdt_getprop(fdt, node, sername, &len); 184 if (path) { 185 char *p = malloc(len); 186 err = -FDT_ERR_NOSPACE; 187 if (p) { 188 memcpy(p, path, len); 189 err = fdt_setprop(fdt, chosenoff, 190 "linux,stdout-path", p, len); 191 free(p); 192 } 193 } else { 194 err = len; 195 } 196 } 197 #endif 198 if (err < 0) 199 printf("WARNING: could not set linux,stdout-path %s.\n", 200 fdt_strerror(err)); 201 202 return err; 203 } 204 #endif 205 206 int fdt_initrd(void *fdt, ulong initrd_start, ulong initrd_end) 207 { 208 int nodeoffset, addr_cell_len; 209 int err, j, total; 210 fdt64_t tmp; 211 uint64_t addr, size; 212 213 /* find or create "/chosen" node. */ 214 nodeoffset = fdt_find_or_add_subnode(fdt, 0, "chosen"); 215 if (nodeoffset < 0) 216 return nodeoffset; 217 218 /* just return if initrd_start/end aren't valid */ 219 if ((initrd_start == 0) || (initrd_end == 0)) 220 return 0; 221 222 total = fdt_num_mem_rsv(fdt); 223 224 /* 225 * Look for an existing entry and update it. If we don't find 226 * the entry, we will j be the next available slot. 227 */ 228 for (j = 0; j < total; j++) { 229 err = fdt_get_mem_rsv(fdt, j, &addr, &size); 230 if (addr == initrd_start) { 231 fdt_del_mem_rsv(fdt, j); 232 break; 233 } 234 } 235 236 err = fdt_add_mem_rsv(fdt, initrd_start, initrd_end - initrd_start); 237 if (err < 0) { 238 printf("fdt_initrd: %s\n", fdt_strerror(err)); 239 return err; 240 } 241 242 addr_cell_len = get_cells_len(fdt, "#address-cells"); 243 244 write_cell((u8 *)&tmp, initrd_start, addr_cell_len); 245 err = fdt_setprop(fdt, nodeoffset, 246 "linux,initrd-start", &tmp, addr_cell_len); 247 if (err < 0) { 248 printf("WARNING: could not set linux,initrd-start %s.\n", 249 fdt_strerror(err)); 250 return err; 251 } 252 write_cell((u8 *)&tmp, initrd_end, addr_cell_len); 253 err = fdt_setprop(fdt, nodeoffset, 254 "linux,initrd-end", &tmp, addr_cell_len); 255 if (err < 0) { 256 printf("WARNING: could not set linux,initrd-end %s.\n", 257 fdt_strerror(err)); 258 259 return err; 260 } 261 262 return 0; 263 } 264 265 int fdt_chosen(void *fdt, int force) 266 { 267 int nodeoffset; 268 int err; 269 char *str; /* used to set string properties */ 270 const char *path; 271 272 err = fdt_check_header(fdt); 273 if (err < 0) { 274 printf("fdt_chosen: %s\n", fdt_strerror(err)); 275 return err; 276 } 277 278 /* find or create "/chosen" node. */ 279 nodeoffset = fdt_find_or_add_subnode(fdt, 0, "chosen"); 280 if (nodeoffset < 0) 281 return nodeoffset; 282 283 /* 284 * Create /chosen properites that don't exist in the fdt. 285 * If the property exists, update it only if the "force" parameter 286 * is true. 287 */ 288 str = getenv("bootargs"); 289 if (str != NULL) { 290 path = fdt_getprop(fdt, nodeoffset, "bootargs", NULL); 291 if ((path == NULL) || force) { 292 err = fdt_setprop(fdt, nodeoffset, 293 "bootargs", str, strlen(str)+1); 294 if (err < 0) 295 printf("WARNING: could not set bootargs %s.\n", 296 fdt_strerror(err)); 297 } 298 } 299 300 #ifdef CONFIG_OF_STDOUT_VIA_ALIAS 301 path = fdt_getprop(fdt, nodeoffset, "linux,stdout-path", NULL); 302 if ((path == NULL) || force) 303 err = fdt_fixup_stdout(fdt, nodeoffset); 304 #endif 305 306 #ifdef OF_STDOUT_PATH 307 path = fdt_getprop(fdt, nodeoffset, "linux,stdout-path", NULL); 308 if ((path == NULL) || force) { 309 err = fdt_setprop(fdt, nodeoffset, 310 "linux,stdout-path", OF_STDOUT_PATH, strlen(OF_STDOUT_PATH)+1); 311 if (err < 0) 312 printf("WARNING: could not set linux,stdout-path %s.\n", 313 fdt_strerror(err)); 314 } 315 #endif 316 317 return err; 318 } 319 320 void do_fixup_by_path(void *fdt, const char *path, const char *prop, 321 const void *val, int len, int create) 322 { 323 #if defined(DEBUG) 324 int i; 325 debug("Updating property '%s/%s' = ", path, prop); 326 for (i = 0; i < len; i++) 327 debug(" %.2x", *(u8*)(val+i)); 328 debug("\n"); 329 #endif 330 int rc = fdt_find_and_setprop(fdt, path, prop, val, len, create); 331 if (rc) 332 printf("Unable to update property %s:%s, err=%s\n", 333 path, prop, fdt_strerror(rc)); 334 } 335 336 void do_fixup_by_path_u32(void *fdt, const char *path, const char *prop, 337 u32 val, int create) 338 { 339 fdt32_t tmp = cpu_to_fdt32(val); 340 do_fixup_by_path(fdt, path, prop, &tmp, sizeof(tmp), create); 341 } 342 343 void do_fixup_by_prop(void *fdt, 344 const char *pname, const void *pval, int plen, 345 const char *prop, const void *val, int len, 346 int create) 347 { 348 int off; 349 #if defined(DEBUG) 350 int i; 351 debug("Updating property '%s' = ", prop); 352 for (i = 0; i < len; i++) 353 debug(" %.2x", *(u8*)(val+i)); 354 debug("\n"); 355 #endif 356 off = fdt_node_offset_by_prop_value(fdt, -1, pname, pval, plen); 357 while (off != -FDT_ERR_NOTFOUND) { 358 if (create || (fdt_get_property(fdt, off, prop, NULL) != NULL)) 359 fdt_setprop(fdt, off, prop, val, len); 360 off = fdt_node_offset_by_prop_value(fdt, off, pname, pval, plen); 361 } 362 } 363 364 void do_fixup_by_prop_u32(void *fdt, 365 const char *pname, const void *pval, int plen, 366 const char *prop, u32 val, int create) 367 { 368 fdt32_t tmp = cpu_to_fdt32(val); 369 do_fixup_by_prop(fdt, pname, pval, plen, prop, &tmp, 4, create); 370 } 371 372 void do_fixup_by_compat(void *fdt, const char *compat, 373 const char *prop, const void *val, int len, int create) 374 { 375 int off = -1; 376 #if defined(DEBUG) 377 int i; 378 debug("Updating property '%s' = ", prop); 379 for (i = 0; i < len; i++) 380 debug(" %.2x", *(u8*)(val+i)); 381 debug("\n"); 382 #endif 383 off = fdt_node_offset_by_compatible(fdt, -1, compat); 384 while (off != -FDT_ERR_NOTFOUND) { 385 if (create || (fdt_get_property(fdt, off, prop, NULL) != NULL)) 386 fdt_setprop(fdt, off, prop, val, len); 387 off = fdt_node_offset_by_compatible(fdt, off, compat); 388 } 389 } 390 391 void do_fixup_by_compat_u32(void *fdt, const char *compat, 392 const char *prop, u32 val, int create) 393 { 394 fdt32_t tmp = cpu_to_fdt32(val); 395 do_fixup_by_compat(fdt, compat, prop, &tmp, 4, create); 396 } 397 398 #ifdef CONFIG_NR_DRAM_BANKS 399 #define MEMORY_BANKS_MAX CONFIG_NR_DRAM_BANKS 400 #else 401 #define MEMORY_BANKS_MAX 4 402 #endif 403 int fdt_fixup_memory_banks(void *blob, u64 start[], u64 size[], int banks) 404 { 405 int err, nodeoffset; 406 int addr_cell_len, size_cell_len, len; 407 u8 tmp[MEMORY_BANKS_MAX * 16]; /* Up to 64-bit address + 64-bit size */ 408 int bank; 409 410 if (banks > MEMORY_BANKS_MAX) { 411 printf("%s: num banks %d exceeds hardcoded limit %d." 412 " Recompile with higher MEMORY_BANKS_MAX?\n", 413 __FUNCTION__, banks, MEMORY_BANKS_MAX); 414 return -1; 415 } 416 417 err = fdt_check_header(blob); 418 if (err < 0) { 419 printf("%s: %s\n", __FUNCTION__, fdt_strerror(err)); 420 return err; 421 } 422 423 /* find or create "/memory" node. */ 424 nodeoffset = fdt_find_or_add_subnode(blob, 0, "memory"); 425 if (nodeoffset < 0) 426 return nodeoffset; 427 428 err = fdt_setprop(blob, nodeoffset, "device_type", "memory", 429 sizeof("memory")); 430 if (err < 0) { 431 printf("WARNING: could not set %s %s.\n", "device_type", 432 fdt_strerror(err)); 433 return err; 434 } 435 436 addr_cell_len = get_cells_len(blob, "#address-cells"); 437 size_cell_len = get_cells_len(blob, "#size-cells"); 438 439 for (bank = 0, len = 0; bank < banks; bank++) { 440 write_cell(tmp + len, start[bank], addr_cell_len); 441 len += addr_cell_len; 442 443 write_cell(tmp + len, size[bank], size_cell_len); 444 len += size_cell_len; 445 } 446 447 err = fdt_setprop(blob, nodeoffset, "reg", tmp, len); 448 if (err < 0) { 449 printf("WARNING: could not set %s %s.\n", 450 "reg", fdt_strerror(err)); 451 return err; 452 } 453 return 0; 454 } 455 456 int fdt_fixup_memory(void *blob, u64 start, u64 size) 457 { 458 return fdt_fixup_memory_banks(blob, &start, &size, 1); 459 } 460 461 void fdt_fixup_ethernet(void *fdt) 462 { 463 int node, i, j; 464 char enet[16], *tmp, *end; 465 char mac[16]; 466 const char *path; 467 unsigned char mac_addr[6]; 468 469 node = fdt_path_offset(fdt, "/aliases"); 470 if (node < 0) 471 return; 472 473 if (!getenv("ethaddr")) { 474 if (getenv("usbethaddr")) { 475 strcpy(mac, "usbethaddr"); 476 } else { 477 debug("No ethernet MAC Address defined\n"); 478 return; 479 } 480 } else { 481 strcpy(mac, "ethaddr"); 482 } 483 484 i = 0; 485 while ((tmp = getenv(mac)) != NULL) { 486 sprintf(enet, "ethernet%d", i); 487 path = fdt_getprop(fdt, node, enet, NULL); 488 if (!path) { 489 debug("No alias for %s\n", enet); 490 sprintf(mac, "eth%daddr", ++i); 491 continue; 492 } 493 494 for (j = 0; j < 6; j++) { 495 mac_addr[j] = tmp ? simple_strtoul(tmp, &end, 16) : 0; 496 if (tmp) 497 tmp = (*end) ? end+1 : end; 498 } 499 500 do_fixup_by_path(fdt, path, "mac-address", &mac_addr, 6, 0); 501 do_fixup_by_path(fdt, path, "local-mac-address", 502 &mac_addr, 6, 1); 503 504 sprintf(mac, "eth%daddr", ++i); 505 } 506 } 507 508 /* Resize the fdt to its actual size + a bit of padding */ 509 int fdt_resize(void *blob) 510 { 511 int i; 512 uint64_t addr, size; 513 int total, ret; 514 uint actualsize; 515 516 if (!blob) 517 return 0; 518 519 total = fdt_num_mem_rsv(blob); 520 for (i = 0; i < total; i++) { 521 fdt_get_mem_rsv(blob, i, &addr, &size); 522 if (addr == (uintptr_t)blob) { 523 fdt_del_mem_rsv(blob, i); 524 break; 525 } 526 } 527 528 /* 529 * Calculate the actual size of the fdt 530 * plus the size needed for 5 fdt_add_mem_rsv, one 531 * for the fdt itself and 4 for a possible initrd 532 * ((initrd-start + initrd-end) * 2 (name & value)) 533 */ 534 actualsize = fdt_off_dt_strings(blob) + 535 fdt_size_dt_strings(blob) + 5 * sizeof(struct fdt_reserve_entry); 536 537 /* Make it so the fdt ends on a page boundary */ 538 actualsize = ALIGN(actualsize + ((uintptr_t)blob & 0xfff), 0x1000); 539 actualsize = actualsize - ((uintptr_t)blob & 0xfff); 540 541 /* Change the fdt header to reflect the correct size */ 542 fdt_set_totalsize(blob, actualsize); 543 544 /* Add the new reservation */ 545 ret = fdt_add_mem_rsv(blob, (uintptr_t)blob, actualsize); 546 if (ret < 0) 547 return ret; 548 549 return actualsize; 550 } 551 552 #ifdef CONFIG_PCI 553 #define CONFIG_SYS_PCI_NR_INBOUND_WIN 4 554 555 #define FDT_PCI_PREFETCH (0x40000000) 556 #define FDT_PCI_MEM32 (0x02000000) 557 #define FDT_PCI_IO (0x01000000) 558 #define FDT_PCI_MEM64 (0x03000000) 559 560 int fdt_pci_dma_ranges(void *blob, int phb_off, struct pci_controller *hose) { 561 562 int addrcell, sizecell, len, r; 563 u32 *dma_range; 564 /* sized based on pci addr cells, size-cells, & address-cells */ 565 u32 dma_ranges[(3 + 2 + 2) * CONFIG_SYS_PCI_NR_INBOUND_WIN]; 566 567 addrcell = fdt_getprop_u32_default(blob, "/", "#address-cells", 1); 568 sizecell = fdt_getprop_u32_default(blob, "/", "#size-cells", 1); 569 570 dma_range = &dma_ranges[0]; 571 for (r = 0; r < hose->region_count; r++) { 572 u64 bus_start, phys_start, size; 573 574 /* skip if !PCI_REGION_SYS_MEMORY */ 575 if (!(hose->regions[r].flags & PCI_REGION_SYS_MEMORY)) 576 continue; 577 578 bus_start = (u64)hose->regions[r].bus_start; 579 phys_start = (u64)hose->regions[r].phys_start; 580 size = (u64)hose->regions[r].size; 581 582 dma_range[0] = 0; 583 if (size >= 0x100000000ull) 584 dma_range[0] |= FDT_PCI_MEM64; 585 else 586 dma_range[0] |= FDT_PCI_MEM32; 587 if (hose->regions[r].flags & PCI_REGION_PREFETCH) 588 dma_range[0] |= FDT_PCI_PREFETCH; 589 #ifdef CONFIG_SYS_PCI_64BIT 590 dma_range[1] = bus_start >> 32; 591 #else 592 dma_range[1] = 0; 593 #endif 594 dma_range[2] = bus_start & 0xffffffff; 595 596 if (addrcell == 2) { 597 dma_range[3] = phys_start >> 32; 598 dma_range[4] = phys_start & 0xffffffff; 599 } else { 600 dma_range[3] = phys_start & 0xffffffff; 601 } 602 603 if (sizecell == 2) { 604 dma_range[3 + addrcell + 0] = size >> 32; 605 dma_range[3 + addrcell + 1] = size & 0xffffffff; 606 } else { 607 dma_range[3 + addrcell + 0] = size & 0xffffffff; 608 } 609 610 dma_range += (3 + addrcell + sizecell); 611 } 612 613 len = dma_range - &dma_ranges[0]; 614 if (len) 615 fdt_setprop(blob, phb_off, "dma-ranges", &dma_ranges[0], len*4); 616 617 return 0; 618 } 619 #endif 620 621 #ifdef CONFIG_FDT_FIXUP_NOR_FLASH_SIZE 622 /* 623 * Provide a weak default function to return the flash bank size. 624 * There might be multiple non-identical flash chips connected to one 625 * chip-select, so we need to pass an index as well. 626 */ 627 u32 __flash_get_bank_size(int cs, int idx) 628 { 629 extern flash_info_t flash_info[]; 630 631 /* 632 * As default, a simple 1:1 mapping is provided. Boards with 633 * a different mapping need to supply a board specific mapping 634 * routine. 635 */ 636 return flash_info[cs].size; 637 } 638 u32 flash_get_bank_size(int cs, int idx) 639 __attribute__((weak, alias("__flash_get_bank_size"))); 640 641 /* 642 * This function can be used to update the size in the "reg" property 643 * of all NOR FLASH device nodes. This is necessary for boards with 644 * non-fixed NOR FLASH sizes. 645 */ 646 int fdt_fixup_nor_flash_size(void *blob) 647 { 648 char compat[][16] = { "cfi-flash", "jedec-flash" }; 649 int off; 650 int len; 651 struct fdt_property *prop; 652 u32 *reg, *reg2; 653 int i; 654 655 for (i = 0; i < 2; i++) { 656 off = fdt_node_offset_by_compatible(blob, -1, compat[i]); 657 while (off != -FDT_ERR_NOTFOUND) { 658 int idx; 659 660 /* 661 * Found one compatible node, so fixup the size 662 * int its reg properties 663 */ 664 prop = fdt_get_property_w(blob, off, "reg", &len); 665 if (prop) { 666 int tuple_size = 3 * sizeof(reg); 667 668 /* 669 * There might be multiple reg-tuples, 670 * so loop through them all 671 */ 672 reg = reg2 = (u32 *)&prop->data[0]; 673 for (idx = 0; idx < (len / tuple_size); idx++) { 674 /* 675 * Update size in reg property 676 */ 677 reg[2] = flash_get_bank_size(reg[0], 678 idx); 679 680 /* 681 * Point to next reg tuple 682 */ 683 reg += 3; 684 } 685 686 fdt_setprop(blob, off, "reg", reg2, len); 687 } 688 689 /* Move to next compatible node */ 690 off = fdt_node_offset_by_compatible(blob, off, 691 compat[i]); 692 } 693 } 694 695 return 0; 696 } 697 #endif 698 699 int fdt_increase_size(void *fdt, int add_len) 700 { 701 int newlen; 702 703 newlen = fdt_totalsize(fdt) + add_len; 704 705 /* Open in place with a new len */ 706 return fdt_open_into(fdt, fdt, newlen); 707 } 708 709 #ifdef CONFIG_FDT_FIXUP_PARTITIONS 710 #include <jffs2/load_kernel.h> 711 #include <mtd_node.h> 712 713 struct reg_cell { 714 unsigned int r0; 715 unsigned int r1; 716 }; 717 718 int fdt_del_subnodes(const void *blob, int parent_offset) 719 { 720 int off, ndepth; 721 int ret; 722 723 for (ndepth = 0, off = fdt_next_node(blob, parent_offset, &ndepth); 724 (off >= 0) && (ndepth > 0); 725 off = fdt_next_node(blob, off, &ndepth)) { 726 if (ndepth == 1) { 727 debug("delete %s: offset: %x\n", 728 fdt_get_name(blob, off, 0), off); 729 ret = fdt_del_node((void *)blob, off); 730 if (ret < 0) { 731 printf("Can't delete node: %s\n", 732 fdt_strerror(ret)); 733 return ret; 734 } else { 735 ndepth = 0; 736 off = parent_offset; 737 } 738 } 739 } 740 return 0; 741 } 742 743 int fdt_del_partitions(void *blob, int parent_offset) 744 { 745 const void *prop; 746 int ndepth = 0; 747 int off; 748 int ret; 749 750 off = fdt_next_node(blob, parent_offset, &ndepth); 751 if (off > 0 && ndepth == 1) { 752 prop = fdt_getprop(blob, off, "label", NULL); 753 if (prop == NULL) { 754 /* 755 * Could not find label property, nand {}; node? 756 * Check subnode, delete partitions there if any. 757 */ 758 return fdt_del_partitions(blob, off); 759 } else { 760 ret = fdt_del_subnodes(blob, parent_offset); 761 if (ret < 0) { 762 printf("Can't remove subnodes: %s\n", 763 fdt_strerror(ret)); 764 return ret; 765 } 766 } 767 } 768 return 0; 769 } 770 771 int fdt_node_set_part_info(void *blob, int parent_offset, 772 struct mtd_device *dev) 773 { 774 struct list_head *pentry; 775 struct part_info *part; 776 struct reg_cell cell; 777 int off, ndepth = 0; 778 int part_num, ret; 779 char buf[64]; 780 781 ret = fdt_del_partitions(blob, parent_offset); 782 if (ret < 0) 783 return ret; 784 785 /* 786 * Check if it is nand {}; subnode, adjust 787 * the offset in this case 788 */ 789 off = fdt_next_node(blob, parent_offset, &ndepth); 790 if (off > 0 && ndepth == 1) 791 parent_offset = off; 792 793 part_num = 0; 794 list_for_each_prev(pentry, &dev->parts) { 795 int newoff; 796 797 part = list_entry(pentry, struct part_info, link); 798 799 debug("%2d: %-20s0x%08llx\t0x%08llx\t%d\n", 800 part_num, part->name, part->size, 801 part->offset, part->mask_flags); 802 803 sprintf(buf, "partition@%llx", part->offset); 804 add_sub: 805 ret = fdt_add_subnode(blob, parent_offset, buf); 806 if (ret == -FDT_ERR_NOSPACE) { 807 ret = fdt_increase_size(blob, 512); 808 if (!ret) 809 goto add_sub; 810 else 811 goto err_size; 812 } else if (ret < 0) { 813 printf("Can't add partition node: %s\n", 814 fdt_strerror(ret)); 815 return ret; 816 } 817 newoff = ret; 818 819 /* Check MTD_WRITEABLE_CMD flag */ 820 if (part->mask_flags & 1) { 821 add_ro: 822 ret = fdt_setprop(blob, newoff, "read_only", NULL, 0); 823 if (ret == -FDT_ERR_NOSPACE) { 824 ret = fdt_increase_size(blob, 512); 825 if (!ret) 826 goto add_ro; 827 else 828 goto err_size; 829 } else if (ret < 0) 830 goto err_prop; 831 } 832 833 cell.r0 = cpu_to_fdt32(part->offset); 834 cell.r1 = cpu_to_fdt32(part->size); 835 add_reg: 836 ret = fdt_setprop(blob, newoff, "reg", &cell, sizeof(cell)); 837 if (ret == -FDT_ERR_NOSPACE) { 838 ret = fdt_increase_size(blob, 512); 839 if (!ret) 840 goto add_reg; 841 else 842 goto err_size; 843 } else if (ret < 0) 844 goto err_prop; 845 846 add_label: 847 ret = fdt_setprop_string(blob, newoff, "label", part->name); 848 if (ret == -FDT_ERR_NOSPACE) { 849 ret = fdt_increase_size(blob, 512); 850 if (!ret) 851 goto add_label; 852 else 853 goto err_size; 854 } else if (ret < 0) 855 goto err_prop; 856 857 part_num++; 858 } 859 return 0; 860 err_size: 861 printf("Can't increase blob size: %s\n", fdt_strerror(ret)); 862 return ret; 863 err_prop: 864 printf("Can't add property: %s\n", fdt_strerror(ret)); 865 return ret; 866 } 867 868 /* 869 * Update partitions in nor/nand nodes using info from 870 * mtdparts environment variable. The nodes to update are 871 * specified by node_info structure which contains mtd device 872 * type and compatible string: E. g. the board code in 873 * ft_board_setup() could use: 874 * 875 * struct node_info nodes[] = { 876 * { "fsl,mpc5121-nfc", MTD_DEV_TYPE_NAND, }, 877 * { "cfi-flash", MTD_DEV_TYPE_NOR, }, 878 * }; 879 * 880 * fdt_fixup_mtdparts(blob, nodes, ARRAY_SIZE(nodes)); 881 */ 882 void fdt_fixup_mtdparts(void *blob, void *node_info, int node_info_size) 883 { 884 struct node_info *ni = node_info; 885 struct mtd_device *dev; 886 char *parts; 887 int i, idx; 888 int noff; 889 890 parts = getenv("mtdparts"); 891 if (!parts) 892 return; 893 894 if (mtdparts_init() != 0) 895 return; 896 897 for (i = 0; i < node_info_size; i++) { 898 idx = 0; 899 noff = fdt_node_offset_by_compatible(blob, -1, ni[i].compat); 900 while (noff != -FDT_ERR_NOTFOUND) { 901 debug("%s: %s, mtd dev type %d\n", 902 fdt_get_name(blob, noff, 0), 903 ni[i].compat, ni[i].type); 904 dev = device_find(ni[i].type, idx++); 905 if (dev) { 906 if (fdt_node_set_part_info(blob, noff, dev)) 907 return; /* return on error */ 908 } 909 910 /* Jump to next flash node */ 911 noff = fdt_node_offset_by_compatible(blob, noff, 912 ni[i].compat); 913 } 914 } 915 } 916 #endif 917 918 void fdt_del_node_and_alias(void *blob, const char *alias) 919 { 920 int off = fdt_path_offset(blob, alias); 921 922 if (off < 0) 923 return; 924 925 fdt_del_node(blob, off); 926 927 off = fdt_path_offset(blob, "/aliases"); 928 fdt_delprop(blob, off, alias); 929 } 930 931 /* Helper to read a big number; size is in cells (not bytes) */ 932 static inline u64 of_read_number(const fdt32_t *cell, int size) 933 { 934 u64 r = 0; 935 while (size--) 936 r = (r << 32) | fdt32_to_cpu(*(cell++)); 937 return r; 938 } 939 940 #define PRu64 "%llx" 941 942 /* Max address size we deal with */ 943 #define OF_MAX_ADDR_CELLS 4 944 #define OF_BAD_ADDR ((u64)-1) 945 #define OF_CHECK_COUNTS(na, ns) ((na) > 0 && (na) <= OF_MAX_ADDR_CELLS && \ 946 (ns) > 0) 947 948 /* Debug utility */ 949 #ifdef DEBUG 950 static void of_dump_addr(const char *s, const fdt32_t *addr, int na) 951 { 952 printf("%s", s); 953 while(na--) 954 printf(" %08x", *(addr++)); 955 printf("\n"); 956 } 957 #else 958 static void of_dump_addr(const char *s, const fdt32_t *addr, int na) { } 959 #endif 960 961 /* Callbacks for bus specific translators */ 962 struct of_bus { 963 const char *name; 964 const char *addresses; 965 void (*count_cells)(void *blob, int parentoffset, 966 int *addrc, int *sizec); 967 u64 (*map)(fdt32_t *addr, const fdt32_t *range, 968 int na, int ns, int pna); 969 int (*translate)(fdt32_t *addr, u64 offset, int na); 970 }; 971 972 /* Default translator (generic bus) */ 973 static void of_bus_default_count_cells(void *blob, int parentoffset, 974 int *addrc, int *sizec) 975 { 976 const fdt32_t *prop; 977 978 if (addrc) { 979 prop = fdt_getprop(blob, parentoffset, "#address-cells", NULL); 980 if (prop) 981 *addrc = be32_to_cpup(prop); 982 else 983 *addrc = 2; 984 } 985 986 if (sizec) { 987 prop = fdt_getprop(blob, parentoffset, "#size-cells", NULL); 988 if (prop) 989 *sizec = be32_to_cpup(prop); 990 else 991 *sizec = 1; 992 } 993 } 994 995 static u64 of_bus_default_map(fdt32_t *addr, const fdt32_t *range, 996 int na, int ns, int pna) 997 { 998 u64 cp, s, da; 999 1000 cp = of_read_number(range, na); 1001 s = of_read_number(range + na + pna, ns); 1002 da = of_read_number(addr, na); 1003 1004 debug("OF: default map, cp="PRu64", s="PRu64", da="PRu64"\n", 1005 cp, s, da); 1006 1007 if (da < cp || da >= (cp + s)) 1008 return OF_BAD_ADDR; 1009 return da - cp; 1010 } 1011 1012 static int of_bus_default_translate(fdt32_t *addr, u64 offset, int na) 1013 { 1014 u64 a = of_read_number(addr, na); 1015 memset(addr, 0, na * 4); 1016 a += offset; 1017 if (na > 1) 1018 addr[na - 2] = cpu_to_fdt32(a >> 32); 1019 addr[na - 1] = cpu_to_fdt32(a & 0xffffffffu); 1020 1021 return 0; 1022 } 1023 1024 /* Array of bus specific translators */ 1025 static struct of_bus of_busses[] = { 1026 /* Default */ 1027 { 1028 .name = "default", 1029 .addresses = "reg", 1030 .count_cells = of_bus_default_count_cells, 1031 .map = of_bus_default_map, 1032 .translate = of_bus_default_translate, 1033 }, 1034 }; 1035 1036 static int of_translate_one(void * blob, int parent, struct of_bus *bus, 1037 struct of_bus *pbus, fdt32_t *addr, 1038 int na, int ns, int pna, const char *rprop) 1039 { 1040 const fdt32_t *ranges; 1041 int rlen; 1042 int rone; 1043 u64 offset = OF_BAD_ADDR; 1044 1045 /* Normally, an absence of a "ranges" property means we are 1046 * crossing a non-translatable boundary, and thus the addresses 1047 * below the current not cannot be converted to CPU physical ones. 1048 * Unfortunately, while this is very clear in the spec, it's not 1049 * what Apple understood, and they do have things like /uni-n or 1050 * /ht nodes with no "ranges" property and a lot of perfectly 1051 * useable mapped devices below them. Thus we treat the absence of 1052 * "ranges" as equivalent to an empty "ranges" property which means 1053 * a 1:1 translation at that level. It's up to the caller not to try 1054 * to translate addresses that aren't supposed to be translated in 1055 * the first place. --BenH. 1056 */ 1057 ranges = fdt_getprop(blob, parent, rprop, &rlen); 1058 if (ranges == NULL || rlen == 0) { 1059 offset = of_read_number(addr, na); 1060 memset(addr, 0, pna * 4); 1061 debug("OF: no ranges, 1:1 translation\n"); 1062 goto finish; 1063 } 1064 1065 debug("OF: walking ranges...\n"); 1066 1067 /* Now walk through the ranges */ 1068 rlen /= 4; 1069 rone = na + pna + ns; 1070 for (; rlen >= rone; rlen -= rone, ranges += rone) { 1071 offset = bus->map(addr, ranges, na, ns, pna); 1072 if (offset != OF_BAD_ADDR) 1073 break; 1074 } 1075 if (offset == OF_BAD_ADDR) { 1076 debug("OF: not found !\n"); 1077 return 1; 1078 } 1079 memcpy(addr, ranges + na, 4 * pna); 1080 1081 finish: 1082 of_dump_addr("OF: parent translation for:", addr, pna); 1083 debug("OF: with offset: "PRu64"\n", offset); 1084 1085 /* Translate it into parent bus space */ 1086 return pbus->translate(addr, offset, pna); 1087 } 1088 1089 /* 1090 * Translate an address from the device-tree into a CPU physical address, 1091 * this walks up the tree and applies the various bus mappings on the 1092 * way. 1093 * 1094 * Note: We consider that crossing any level with #size-cells == 0 to mean 1095 * that translation is impossible (that is we are not dealing with a value 1096 * that can be mapped to a cpu physical address). This is not really specified 1097 * that way, but this is traditionally the way IBM at least do things 1098 */ 1099 static u64 __of_translate_address(void *blob, int node_offset, const fdt32_t *in_addr, 1100 const char *rprop) 1101 { 1102 int parent; 1103 struct of_bus *bus, *pbus; 1104 fdt32_t addr[OF_MAX_ADDR_CELLS]; 1105 int na, ns, pna, pns; 1106 u64 result = OF_BAD_ADDR; 1107 1108 debug("OF: ** translation for device %s **\n", 1109 fdt_get_name(blob, node_offset, NULL)); 1110 1111 /* Get parent & match bus type */ 1112 parent = fdt_parent_offset(blob, node_offset); 1113 if (parent < 0) 1114 goto bail; 1115 bus = &of_busses[0]; 1116 1117 /* Cound address cells & copy address locally */ 1118 bus->count_cells(blob, parent, &na, &ns); 1119 if (!OF_CHECK_COUNTS(na, ns)) { 1120 printf("%s: Bad cell count for %s\n", __FUNCTION__, 1121 fdt_get_name(blob, node_offset, NULL)); 1122 goto bail; 1123 } 1124 memcpy(addr, in_addr, na * 4); 1125 1126 debug("OF: bus is %s (na=%d, ns=%d) on %s\n", 1127 bus->name, na, ns, fdt_get_name(blob, parent, NULL)); 1128 of_dump_addr("OF: translating address:", addr, na); 1129 1130 /* Translate */ 1131 for (;;) { 1132 /* Switch to parent bus */ 1133 node_offset = parent; 1134 parent = fdt_parent_offset(blob, node_offset); 1135 1136 /* If root, we have finished */ 1137 if (parent < 0) { 1138 debug("OF: reached root node\n"); 1139 result = of_read_number(addr, na); 1140 break; 1141 } 1142 1143 /* Get new parent bus and counts */ 1144 pbus = &of_busses[0]; 1145 pbus->count_cells(blob, parent, &pna, &pns); 1146 if (!OF_CHECK_COUNTS(pna, pns)) { 1147 printf("%s: Bad cell count for %s\n", __FUNCTION__, 1148 fdt_get_name(blob, node_offset, NULL)); 1149 break; 1150 } 1151 1152 debug("OF: parent bus is %s (na=%d, ns=%d) on %s\n", 1153 pbus->name, pna, pns, fdt_get_name(blob, parent, NULL)); 1154 1155 /* Apply bus translation */ 1156 if (of_translate_one(blob, node_offset, bus, pbus, 1157 addr, na, ns, pna, rprop)) 1158 break; 1159 1160 /* Complete the move up one level */ 1161 na = pna; 1162 ns = pns; 1163 bus = pbus; 1164 1165 of_dump_addr("OF: one level translation:", addr, na); 1166 } 1167 bail: 1168 1169 return result; 1170 } 1171 1172 u64 fdt_translate_address(void *blob, int node_offset, const fdt32_t *in_addr) 1173 { 1174 return __of_translate_address(blob, node_offset, in_addr, "ranges"); 1175 } 1176 1177 /** 1178 * fdt_node_offset_by_compat_reg: Find a node that matches compatiable and 1179 * who's reg property matches a physical cpu address 1180 * 1181 * @blob: ptr to device tree 1182 * @compat: compatiable string to match 1183 * @compat_off: property name 1184 * 1185 */ 1186 int fdt_node_offset_by_compat_reg(void *blob, const char *compat, 1187 phys_addr_t compat_off) 1188 { 1189 int len, off = fdt_node_offset_by_compatible(blob, -1, compat); 1190 while (off != -FDT_ERR_NOTFOUND) { 1191 const fdt32_t *reg = fdt_getprop(blob, off, "reg", &len); 1192 if (reg) { 1193 if (compat_off == fdt_translate_address(blob, off, reg)) 1194 return off; 1195 } 1196 off = fdt_node_offset_by_compatible(blob, off, compat); 1197 } 1198 1199 return -FDT_ERR_NOTFOUND; 1200 } 1201 1202 /** 1203 * fdt_alloc_phandle: Return next free phandle value 1204 * 1205 * @blob: ptr to device tree 1206 */ 1207 int fdt_alloc_phandle(void *blob) 1208 { 1209 int offset, phandle = 0; 1210 1211 for (offset = fdt_next_node(blob, -1, NULL); offset >= 0; 1212 offset = fdt_next_node(blob, offset, NULL)) { 1213 phandle = max(phandle, fdt_get_phandle(blob, offset)); 1214 } 1215 1216 return phandle + 1; 1217 } 1218 1219 /* 1220 * fdt_set_phandle: Create a phandle property for the given node 1221 * 1222 * @fdt: ptr to device tree 1223 * @nodeoffset: node to update 1224 * @phandle: phandle value to set (must be unique) 1225 */ 1226 int fdt_set_phandle(void *fdt, int nodeoffset, uint32_t phandle) 1227 { 1228 int ret; 1229 1230 #ifdef DEBUG 1231 int off = fdt_node_offset_by_phandle(fdt, phandle); 1232 1233 if ((off >= 0) && (off != nodeoffset)) { 1234 char buf[64]; 1235 1236 fdt_get_path(fdt, nodeoffset, buf, sizeof(buf)); 1237 printf("Trying to update node %s with phandle %u ", 1238 buf, phandle); 1239 1240 fdt_get_path(fdt, off, buf, sizeof(buf)); 1241 printf("that already exists in node %s.\n", buf); 1242 return -FDT_ERR_BADPHANDLE; 1243 } 1244 #endif 1245 1246 ret = fdt_setprop_cell(fdt, nodeoffset, "phandle", phandle); 1247 if (ret < 0) 1248 return ret; 1249 1250 /* 1251 * For now, also set the deprecated "linux,phandle" property, so that we 1252 * don't break older kernels. 1253 */ 1254 ret = fdt_setprop_cell(fdt, nodeoffset, "linux,phandle", phandle); 1255 1256 return ret; 1257 } 1258 1259 /* 1260 * fdt_create_phandle: Create a phandle property for the given node 1261 * 1262 * @fdt: ptr to device tree 1263 * @nodeoffset: node to update 1264 */ 1265 unsigned int fdt_create_phandle(void *fdt, int nodeoffset) 1266 { 1267 /* see if there is a phandle already */ 1268 int phandle = fdt_get_phandle(fdt, nodeoffset); 1269 1270 /* if we got 0, means no phandle so create one */ 1271 if (phandle == 0) { 1272 int ret; 1273 1274 phandle = fdt_alloc_phandle(fdt); 1275 ret = fdt_set_phandle(fdt, nodeoffset, phandle); 1276 if (ret < 0) { 1277 printf("Can't set phandle %u: %s\n", phandle, 1278 fdt_strerror(ret)); 1279 return 0; 1280 } 1281 } 1282 1283 return phandle; 1284 } 1285 1286 /* 1287 * fdt_set_node_status: Set status for the given node 1288 * 1289 * @fdt: ptr to device tree 1290 * @nodeoffset: node to update 1291 * @status: FDT_STATUS_OKAY, FDT_STATUS_DISABLED, 1292 * FDT_STATUS_FAIL, FDT_STATUS_FAIL_ERROR_CODE 1293 * @error_code: optional, only used if status is FDT_STATUS_FAIL_ERROR_CODE 1294 */ 1295 int fdt_set_node_status(void *fdt, int nodeoffset, 1296 enum fdt_status status, unsigned int error_code) 1297 { 1298 char buf[16]; 1299 int ret = 0; 1300 1301 if (nodeoffset < 0) 1302 return nodeoffset; 1303 1304 switch (status) { 1305 case FDT_STATUS_OKAY: 1306 ret = fdt_setprop_string(fdt, nodeoffset, "status", "okay"); 1307 break; 1308 case FDT_STATUS_DISABLED: 1309 ret = fdt_setprop_string(fdt, nodeoffset, "status", "disabled"); 1310 break; 1311 case FDT_STATUS_FAIL: 1312 ret = fdt_setprop_string(fdt, nodeoffset, "status", "fail"); 1313 break; 1314 case FDT_STATUS_FAIL_ERROR_CODE: 1315 sprintf(buf, "fail-%d", error_code); 1316 ret = fdt_setprop_string(fdt, nodeoffset, "status", buf); 1317 break; 1318 default: 1319 printf("Invalid fdt status: %x\n", status); 1320 ret = -1; 1321 break; 1322 } 1323 1324 return ret; 1325 } 1326 1327 /* 1328 * fdt_set_status_by_alias: Set status for the given node given an alias 1329 * 1330 * @fdt: ptr to device tree 1331 * @alias: alias of node to update 1332 * @status: FDT_STATUS_OKAY, FDT_STATUS_DISABLED, 1333 * FDT_STATUS_FAIL, FDT_STATUS_FAIL_ERROR_CODE 1334 * @error_code: optional, only used if status is FDT_STATUS_FAIL_ERROR_CODE 1335 */ 1336 int fdt_set_status_by_alias(void *fdt, const char* alias, 1337 enum fdt_status status, unsigned int error_code) 1338 { 1339 int offset = fdt_path_offset(fdt, alias); 1340 1341 return fdt_set_node_status(fdt, offset, status, error_code); 1342 } 1343 1344 #if defined(CONFIG_VIDEO) || defined(CONFIG_LCD) 1345 int fdt_add_edid(void *blob, const char *compat, unsigned char *edid_buf) 1346 { 1347 int noff; 1348 int ret; 1349 1350 noff = fdt_node_offset_by_compatible(blob, -1, compat); 1351 if (noff != -FDT_ERR_NOTFOUND) { 1352 debug("%s: %s\n", fdt_get_name(blob, noff, 0), compat); 1353 add_edid: 1354 ret = fdt_setprop(blob, noff, "edid", edid_buf, 128); 1355 if (ret == -FDT_ERR_NOSPACE) { 1356 ret = fdt_increase_size(blob, 512); 1357 if (!ret) 1358 goto add_edid; 1359 else 1360 goto err_size; 1361 } else if (ret < 0) { 1362 printf("Can't add property: %s\n", fdt_strerror(ret)); 1363 return ret; 1364 } 1365 } 1366 return 0; 1367 err_size: 1368 printf("Can't increase blob size: %s\n", fdt_strerror(ret)); 1369 return ret; 1370 } 1371 #endif 1372 1373 /* 1374 * Verify the physical address of device tree node for a given alias 1375 * 1376 * This function locates the device tree node of a given alias, and then 1377 * verifies that the physical address of that device matches the given 1378 * parameter. It displays a message if there is a mismatch. 1379 * 1380 * Returns 1 on success, 0 on failure 1381 */ 1382 int fdt_verify_alias_address(void *fdt, int anode, const char *alias, u64 addr) 1383 { 1384 const char *path; 1385 const fdt32_t *reg; 1386 int node, len; 1387 u64 dt_addr; 1388 1389 path = fdt_getprop(fdt, anode, alias, NULL); 1390 if (!path) { 1391 /* If there's no such alias, then it's not a failure */ 1392 return 1; 1393 } 1394 1395 node = fdt_path_offset(fdt, path); 1396 if (node < 0) { 1397 printf("Warning: device tree alias '%s' points to invalid " 1398 "node %s.\n", alias, path); 1399 return 0; 1400 } 1401 1402 reg = fdt_getprop(fdt, node, "reg", &len); 1403 if (!reg) { 1404 printf("Warning: device tree node '%s' has no address.\n", 1405 path); 1406 return 0; 1407 } 1408 1409 dt_addr = fdt_translate_address(fdt, node, reg); 1410 if (addr != dt_addr) { 1411 printf("Warning: U-Boot configured device %s at address %llx,\n" 1412 " but the device tree has it address %llx.\n", 1413 alias, addr, dt_addr); 1414 return 0; 1415 } 1416 1417 return 1; 1418 } 1419 1420 /* 1421 * Returns the base address of an SOC or PCI node 1422 */ 1423 u64 fdt_get_base_address(void *fdt, int node) 1424 { 1425 int size; 1426 u32 naddr; 1427 const fdt32_t *prop; 1428 1429 prop = fdt_getprop(fdt, node, "#address-cells", &size); 1430 if (prop && size == 4) 1431 naddr = be32_to_cpup(prop); 1432 else 1433 naddr = 2; 1434 1435 prop = fdt_getprop(fdt, node, "ranges", &size); 1436 1437 return prop ? fdt_translate_address(fdt, node, prop + naddr) : 0; 1438 } 1439 1440 /* 1441 * Read a property of size <prop_len>. Currently only supports 1 or 2 cells. 1442 */ 1443 static int fdt_read_prop(const fdt32_t *prop, int prop_len, int cell_off, 1444 uint64_t *val, int cells) 1445 { 1446 const fdt32_t *prop32 = &prop[cell_off]; 1447 const fdt64_t *prop64 = (const fdt64_t *)&prop[cell_off]; 1448 1449 if ((cell_off + cells) > prop_len) 1450 return -FDT_ERR_NOSPACE; 1451 1452 switch (cells) { 1453 case 1: 1454 *val = fdt32_to_cpu(*prop32); 1455 break; 1456 case 2: 1457 *val = fdt64_to_cpu(*prop64); 1458 break; 1459 default: 1460 return -FDT_ERR_NOSPACE; 1461 } 1462 1463 return 0; 1464 } 1465 1466 /** 1467 * fdt_read_range - Read a node's n'th range property 1468 * 1469 * @fdt: ptr to device tree 1470 * @node: offset of node 1471 * @n: range index 1472 * @child_addr: pointer to storage for the "child address" field 1473 * @addr: pointer to storage for the CPU view translated physical start 1474 * @len: pointer to storage for the range length 1475 * 1476 * Convenience function that reads and interprets a specific range out of 1477 * a number of the "ranges" property array. 1478 */ 1479 int fdt_read_range(void *fdt, int node, int n, uint64_t *child_addr, 1480 uint64_t *addr, uint64_t *len) 1481 { 1482 int pnode = fdt_parent_offset(fdt, node); 1483 const fdt32_t *ranges; 1484 int pacells; 1485 int acells; 1486 int scells; 1487 int ranges_len; 1488 int cell = 0; 1489 int r = 0; 1490 1491 /* 1492 * The "ranges" property is an array of 1493 * { <child address> <parent address> <size in child address space> } 1494 * 1495 * All 3 elements can span a diffent number of cells. Fetch their size. 1496 */ 1497 pacells = fdt_getprop_u32_default_node(fdt, pnode, 0, "#address-cells", 1); 1498 acells = fdt_getprop_u32_default_node(fdt, node, 0, "#address-cells", 1); 1499 scells = fdt_getprop_u32_default_node(fdt, node, 0, "#size-cells", 1); 1500 1501 /* Now try to get the ranges property */ 1502 ranges = fdt_getprop(fdt, node, "ranges", &ranges_len); 1503 if (!ranges) 1504 return -FDT_ERR_NOTFOUND; 1505 ranges_len /= sizeof(uint32_t); 1506 1507 /* Jump to the n'th entry */ 1508 cell = n * (pacells + acells + scells); 1509 1510 /* Read <child address> */ 1511 if (child_addr) { 1512 r = fdt_read_prop(ranges, ranges_len, cell, child_addr, 1513 acells); 1514 if (r) 1515 return r; 1516 } 1517 cell += acells; 1518 1519 /* Read <parent address> */ 1520 if (addr) 1521 *addr = fdt_translate_address(fdt, node, ranges + cell); 1522 cell += pacells; 1523 1524 /* Read <size in child address space> */ 1525 if (len) { 1526 r = fdt_read_prop(ranges, ranges_len, cell, len, scells); 1527 if (r) 1528 return r; 1529 } 1530 1531 return 0; 1532 } 1533