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 #ifdef CONFIG_OF_STDOUT_VIA_ALIAS 128 129 #ifdef CONFIG_CONS_INDEX 130 static void fdt_fill_multisername(char *sername, size_t maxlen) 131 { 132 const char *outname = stdio_devices[stdout]->name; 133 134 if (strcmp(outname, "serial") > 0) 135 strncpy(sername, outname, maxlen); 136 137 /* eserial? */ 138 if (strcmp(outname + 1, "serial") > 0) 139 strncpy(sername, outname + 1, maxlen); 140 } 141 #endif 142 143 static int fdt_fixup_stdout(void *fdt, int chosenoff) 144 { 145 int err = 0; 146 #ifdef CONFIG_CONS_INDEX 147 int node; 148 char sername[9] = { 0 }; 149 const char *path; 150 151 fdt_fill_multisername(sername, sizeof(sername) - 1); 152 if (!sername[0]) 153 sprintf(sername, "serial%d", CONFIG_CONS_INDEX - 1); 154 155 err = node = fdt_path_offset(fdt, "/aliases"); 156 if (node >= 0) { 157 int len; 158 path = fdt_getprop(fdt, node, sername, &len); 159 if (path) { 160 char *p = malloc(len); 161 err = -FDT_ERR_NOSPACE; 162 if (p) { 163 memcpy(p, path, len); 164 err = fdt_setprop(fdt, chosenoff, 165 "linux,stdout-path", p, len); 166 free(p); 167 } 168 } else { 169 err = len; 170 } 171 } 172 #endif 173 if (err < 0) 174 printf("WARNING: could not set linux,stdout-path %s.\n", 175 fdt_strerror(err)); 176 177 return err; 178 } 179 #endif 180 181 int fdt_initrd(void *fdt, ulong initrd_start, ulong initrd_end, int force) 182 { 183 int nodeoffset, addr_cell_len; 184 int err, j, total; 185 fdt64_t tmp; 186 const char *path; 187 uint64_t addr, size; 188 189 /* Find the "chosen" node. */ 190 nodeoffset = fdt_path_offset (fdt, "/chosen"); 191 192 /* If there is no "chosen" node in the blob return */ 193 if (nodeoffset < 0) { 194 printf("fdt_initrd: %s\n", fdt_strerror(nodeoffset)); 195 return nodeoffset; 196 } 197 198 /* just return if initrd_start/end aren't valid */ 199 if ((initrd_start == 0) || (initrd_end == 0)) 200 return 0; 201 202 total = fdt_num_mem_rsv(fdt); 203 204 /* 205 * Look for an existing entry and update it. If we don't find 206 * the entry, we will j be the next available slot. 207 */ 208 for (j = 0; j < total; j++) { 209 err = fdt_get_mem_rsv(fdt, j, &addr, &size); 210 if (addr == initrd_start) { 211 fdt_del_mem_rsv(fdt, j); 212 break; 213 } 214 } 215 216 err = fdt_add_mem_rsv(fdt, initrd_start, initrd_end - initrd_start); 217 if (err < 0) { 218 printf("fdt_initrd: %s\n", fdt_strerror(err)); 219 return err; 220 } 221 222 addr_cell_len = get_cells_len(fdt, "#address-cells"); 223 224 path = fdt_getprop(fdt, nodeoffset, "linux,initrd-start", NULL); 225 if ((path == NULL) || force) { 226 write_cell((u8 *)&tmp, initrd_start, addr_cell_len); 227 err = fdt_setprop(fdt, nodeoffset, 228 "linux,initrd-start", &tmp, addr_cell_len); 229 if (err < 0) { 230 printf("WARNING: " 231 "could not set linux,initrd-start %s.\n", 232 fdt_strerror(err)); 233 return err; 234 } 235 write_cell((u8 *)&tmp, initrd_end, addr_cell_len); 236 err = fdt_setprop(fdt, nodeoffset, 237 "linux,initrd-end", &tmp, addr_cell_len); 238 if (err < 0) { 239 printf("WARNING: could not set linux,initrd-end %s.\n", 240 fdt_strerror(err)); 241 242 return err; 243 } 244 } 245 246 return 0; 247 } 248 249 int fdt_chosen(void *fdt, int force) 250 { 251 int nodeoffset; 252 int err; 253 char *str; /* used to set string properties */ 254 const char *path; 255 256 err = fdt_check_header(fdt); 257 if (err < 0) { 258 printf("fdt_chosen: %s\n", fdt_strerror(err)); 259 return err; 260 } 261 262 /* 263 * Find the "chosen" node. 264 */ 265 nodeoffset = fdt_path_offset (fdt, "/chosen"); 266 267 /* 268 * If there is no "chosen" node in the blob, create it. 269 */ 270 if (nodeoffset < 0) { 271 /* 272 * Create a new node "/chosen" (offset 0 is root level) 273 */ 274 nodeoffset = fdt_add_subnode(fdt, 0, "chosen"); 275 if (nodeoffset < 0) { 276 printf("WARNING: could not create /chosen %s.\n", 277 fdt_strerror(nodeoffset)); 278 return nodeoffset; 279 } 280 } 281 282 /* 283 * Create /chosen properites that don't exist in the fdt. 284 * If the property exists, update it only if the "force" parameter 285 * is true. 286 */ 287 str = getenv("bootargs"); 288 if (str != NULL) { 289 path = fdt_getprop(fdt, nodeoffset, "bootargs", NULL); 290 if ((path == NULL) || force) { 291 err = fdt_setprop(fdt, nodeoffset, 292 "bootargs", str, strlen(str)+1); 293 if (err < 0) 294 printf("WARNING: could not set bootargs %s.\n", 295 fdt_strerror(err)); 296 } 297 } 298 299 #ifdef CONFIG_OF_STDOUT_VIA_ALIAS 300 path = fdt_getprop(fdt, nodeoffset, "linux,stdout-path", NULL); 301 if ((path == NULL) || force) 302 err = fdt_fixup_stdout(fdt, nodeoffset); 303 #endif 304 305 #ifdef OF_STDOUT_PATH 306 path = fdt_getprop(fdt, nodeoffset, "linux,stdout-path", NULL); 307 if ((path == NULL) || force) { 308 err = fdt_setprop(fdt, nodeoffset, 309 "linux,stdout-path", OF_STDOUT_PATH, strlen(OF_STDOUT_PATH)+1); 310 if (err < 0) 311 printf("WARNING: could not set linux,stdout-path %s.\n", 312 fdt_strerror(err)); 313 } 314 #endif 315 316 return err; 317 } 318 319 void do_fixup_by_path(void *fdt, const char *path, const char *prop, 320 const void *val, int len, int create) 321 { 322 #if defined(DEBUG) 323 int i; 324 debug("Updating property '%s/%s' = ", path, prop); 325 for (i = 0; i < len; i++) 326 debug(" %.2x", *(u8*)(val+i)); 327 debug("\n"); 328 #endif 329 int rc = fdt_find_and_setprop(fdt, path, prop, val, len, create); 330 if (rc) 331 printf("Unable to update property %s:%s, err=%s\n", 332 path, prop, fdt_strerror(rc)); 333 } 334 335 void do_fixup_by_path_u32(void *fdt, const char *path, const char *prop, 336 u32 val, int create) 337 { 338 fdt32_t tmp = cpu_to_fdt32(val); 339 do_fixup_by_path(fdt, path, prop, &tmp, sizeof(tmp), create); 340 } 341 342 void do_fixup_by_prop(void *fdt, 343 const char *pname, const void *pval, int plen, 344 const char *prop, const void *val, int len, 345 int create) 346 { 347 int off; 348 #if defined(DEBUG) 349 int i; 350 debug("Updating property '%s' = ", prop); 351 for (i = 0; i < len; i++) 352 debug(" %.2x", *(u8*)(val+i)); 353 debug("\n"); 354 #endif 355 off = fdt_node_offset_by_prop_value(fdt, -1, pname, pval, plen); 356 while (off != -FDT_ERR_NOTFOUND) { 357 if (create || (fdt_get_property(fdt, off, prop, NULL) != NULL)) 358 fdt_setprop(fdt, off, prop, val, len); 359 off = fdt_node_offset_by_prop_value(fdt, off, pname, pval, plen); 360 } 361 } 362 363 void do_fixup_by_prop_u32(void *fdt, 364 const char *pname, const void *pval, int plen, 365 const char *prop, u32 val, int create) 366 { 367 fdt32_t tmp = cpu_to_fdt32(val); 368 do_fixup_by_prop(fdt, pname, pval, plen, prop, &tmp, 4, create); 369 } 370 371 void do_fixup_by_compat(void *fdt, const char *compat, 372 const char *prop, const void *val, int len, int create) 373 { 374 int off = -1; 375 #if defined(DEBUG) 376 int i; 377 debug("Updating property '%s' = ", prop); 378 for (i = 0; i < len; i++) 379 debug(" %.2x", *(u8*)(val+i)); 380 debug("\n"); 381 #endif 382 off = fdt_node_offset_by_compatible(fdt, -1, compat); 383 while (off != -FDT_ERR_NOTFOUND) { 384 if (create || (fdt_get_property(fdt, off, prop, NULL) != NULL)) 385 fdt_setprop(fdt, off, prop, val, len); 386 off = fdt_node_offset_by_compatible(fdt, off, compat); 387 } 388 } 389 390 void do_fixup_by_compat_u32(void *fdt, const char *compat, 391 const char *prop, u32 val, int create) 392 { 393 fdt32_t tmp = cpu_to_fdt32(val); 394 do_fixup_by_compat(fdt, compat, prop, &tmp, 4, create); 395 } 396 397 #ifdef CONFIG_NR_DRAM_BANKS 398 #define MEMORY_BANKS_MAX CONFIG_NR_DRAM_BANKS 399 #else 400 #define MEMORY_BANKS_MAX 4 401 #endif 402 int fdt_fixup_memory_banks(void *blob, u64 start[], u64 size[], int banks) 403 { 404 int err, nodeoffset; 405 int addr_cell_len, size_cell_len, len; 406 u8 tmp[MEMORY_BANKS_MAX * 16]; /* Up to 64-bit address + 64-bit size */ 407 int bank; 408 409 if (banks > MEMORY_BANKS_MAX) { 410 printf("%s: num banks %d exceeds hardcoded limit %d." 411 " Recompile with higher MEMORY_BANKS_MAX?\n", 412 __FUNCTION__, banks, MEMORY_BANKS_MAX); 413 return -1; 414 } 415 416 err = fdt_check_header(blob); 417 if (err < 0) { 418 printf("%s: %s\n", __FUNCTION__, fdt_strerror(err)); 419 return err; 420 } 421 422 /* update, or add and update /memory node */ 423 nodeoffset = fdt_path_offset(blob, "/memory"); 424 if (nodeoffset < 0) { 425 nodeoffset = fdt_add_subnode(blob, 0, "memory"); 426 if (nodeoffset < 0) { 427 printf("WARNING: could not create /memory: %s.\n", 428 fdt_strerror(nodeoffset)); 429 return nodeoffset; 430 } 431 } 432 err = fdt_setprop(blob, nodeoffset, "device_type", "memory", 433 sizeof("memory")); 434 if (err < 0) { 435 printf("WARNING: could not set %s %s.\n", "device_type", 436 fdt_strerror(err)); 437 return err; 438 } 439 440 addr_cell_len = get_cells_len(blob, "#address-cells"); 441 size_cell_len = get_cells_len(blob, "#size-cells"); 442 443 for (bank = 0, len = 0; bank < banks; bank++) { 444 write_cell(tmp + len, start[bank], addr_cell_len); 445 len += addr_cell_len; 446 447 write_cell(tmp + len, size[bank], size_cell_len); 448 len += size_cell_len; 449 } 450 451 err = fdt_setprop(blob, nodeoffset, "reg", tmp, len); 452 if (err < 0) { 453 printf("WARNING: could not set %s %s.\n", 454 "reg", fdt_strerror(err)); 455 return err; 456 } 457 return 0; 458 } 459 460 int fdt_fixup_memory(void *blob, u64 start, u64 size) 461 { 462 return fdt_fixup_memory_banks(blob, &start, &size, 1); 463 } 464 465 void fdt_fixup_ethernet(void *fdt) 466 { 467 int node, i, j; 468 char enet[16], *tmp, *end; 469 char mac[16]; 470 const char *path; 471 unsigned char mac_addr[6]; 472 473 node = fdt_path_offset(fdt, "/aliases"); 474 if (node < 0) 475 return; 476 477 if (!getenv("ethaddr")) { 478 if (getenv("usbethaddr")) { 479 strcpy(mac, "usbethaddr"); 480 } else { 481 debug("No ethernet MAC Address defined\n"); 482 return; 483 } 484 } else { 485 strcpy(mac, "ethaddr"); 486 } 487 488 i = 0; 489 while ((tmp = getenv(mac)) != NULL) { 490 sprintf(enet, "ethernet%d", i); 491 path = fdt_getprop(fdt, node, enet, NULL); 492 if (!path) { 493 debug("No alias for %s\n", enet); 494 sprintf(mac, "eth%daddr", ++i); 495 continue; 496 } 497 498 for (j = 0; j < 6; j++) { 499 mac_addr[j] = tmp ? simple_strtoul(tmp, &end, 16) : 0; 500 if (tmp) 501 tmp = (*end) ? end+1 : end; 502 } 503 504 do_fixup_by_path(fdt, path, "mac-address", &mac_addr, 6, 0); 505 do_fixup_by_path(fdt, path, "local-mac-address", 506 &mac_addr, 6, 1); 507 508 sprintf(mac, "eth%daddr", ++i); 509 } 510 } 511 512 /* Resize the fdt to its actual size + a bit of padding */ 513 int fdt_resize(void *blob) 514 { 515 int i; 516 uint64_t addr, size; 517 int total, ret; 518 uint actualsize; 519 520 if (!blob) 521 return 0; 522 523 total = fdt_num_mem_rsv(blob); 524 for (i = 0; i < total; i++) { 525 fdt_get_mem_rsv(blob, i, &addr, &size); 526 if (addr == (uintptr_t)blob) { 527 fdt_del_mem_rsv(blob, i); 528 break; 529 } 530 } 531 532 /* 533 * Calculate the actual size of the fdt 534 * plus the size needed for 5 fdt_add_mem_rsv, one 535 * for the fdt itself and 4 for a possible initrd 536 * ((initrd-start + initrd-end) * 2 (name & value)) 537 */ 538 actualsize = fdt_off_dt_strings(blob) + 539 fdt_size_dt_strings(blob) + 5 * sizeof(struct fdt_reserve_entry); 540 541 /* Make it so the fdt ends on a page boundary */ 542 actualsize = ALIGN(actualsize + ((uintptr_t)blob & 0xfff), 0x1000); 543 actualsize = actualsize - ((uintptr_t)blob & 0xfff); 544 545 /* Change the fdt header to reflect the correct size */ 546 fdt_set_totalsize(blob, actualsize); 547 548 /* Add the new reservation */ 549 ret = fdt_add_mem_rsv(blob, (uintptr_t)blob, actualsize); 550 if (ret < 0) 551 return ret; 552 553 return actualsize; 554 } 555 556 #ifdef CONFIG_PCI 557 #define CONFIG_SYS_PCI_NR_INBOUND_WIN 4 558 559 #define FDT_PCI_PREFETCH (0x40000000) 560 #define FDT_PCI_MEM32 (0x02000000) 561 #define FDT_PCI_IO (0x01000000) 562 #define FDT_PCI_MEM64 (0x03000000) 563 564 int fdt_pci_dma_ranges(void *blob, int phb_off, struct pci_controller *hose) { 565 566 int addrcell, sizecell, len, r; 567 u32 *dma_range; 568 /* sized based on pci addr cells, size-cells, & address-cells */ 569 u32 dma_ranges[(3 + 2 + 2) * CONFIG_SYS_PCI_NR_INBOUND_WIN]; 570 571 addrcell = fdt_getprop_u32_default(blob, "/", "#address-cells", 1); 572 sizecell = fdt_getprop_u32_default(blob, "/", "#size-cells", 1); 573 574 dma_range = &dma_ranges[0]; 575 for (r = 0; r < hose->region_count; r++) { 576 u64 bus_start, phys_start, size; 577 578 /* skip if !PCI_REGION_SYS_MEMORY */ 579 if (!(hose->regions[r].flags & PCI_REGION_SYS_MEMORY)) 580 continue; 581 582 bus_start = (u64)hose->regions[r].bus_start; 583 phys_start = (u64)hose->regions[r].phys_start; 584 size = (u64)hose->regions[r].size; 585 586 dma_range[0] = 0; 587 if (size >= 0x100000000ull) 588 dma_range[0] |= FDT_PCI_MEM64; 589 else 590 dma_range[0] |= FDT_PCI_MEM32; 591 if (hose->regions[r].flags & PCI_REGION_PREFETCH) 592 dma_range[0] |= FDT_PCI_PREFETCH; 593 #ifdef CONFIG_SYS_PCI_64BIT 594 dma_range[1] = bus_start >> 32; 595 #else 596 dma_range[1] = 0; 597 #endif 598 dma_range[2] = bus_start & 0xffffffff; 599 600 if (addrcell == 2) { 601 dma_range[3] = phys_start >> 32; 602 dma_range[4] = phys_start & 0xffffffff; 603 } else { 604 dma_range[3] = phys_start & 0xffffffff; 605 } 606 607 if (sizecell == 2) { 608 dma_range[3 + addrcell + 0] = size >> 32; 609 dma_range[3 + addrcell + 1] = size & 0xffffffff; 610 } else { 611 dma_range[3 + addrcell + 0] = size & 0xffffffff; 612 } 613 614 dma_range += (3 + addrcell + sizecell); 615 } 616 617 len = dma_range - &dma_ranges[0]; 618 if (len) 619 fdt_setprop(blob, phb_off, "dma-ranges", &dma_ranges[0], len*4); 620 621 return 0; 622 } 623 #endif 624 625 #ifdef CONFIG_FDT_FIXUP_NOR_FLASH_SIZE 626 /* 627 * Provide a weak default function to return the flash bank size. 628 * There might be multiple non-identical flash chips connected to one 629 * chip-select, so we need to pass an index as well. 630 */ 631 u32 __flash_get_bank_size(int cs, int idx) 632 { 633 extern flash_info_t flash_info[]; 634 635 /* 636 * As default, a simple 1:1 mapping is provided. Boards with 637 * a different mapping need to supply a board specific mapping 638 * routine. 639 */ 640 return flash_info[cs].size; 641 } 642 u32 flash_get_bank_size(int cs, int idx) 643 __attribute__((weak, alias("__flash_get_bank_size"))); 644 645 /* 646 * This function can be used to update the size in the "reg" property 647 * of all NOR FLASH device nodes. This is necessary for boards with 648 * non-fixed NOR FLASH sizes. 649 */ 650 int fdt_fixup_nor_flash_size(void *blob) 651 { 652 char compat[][16] = { "cfi-flash", "jedec-flash" }; 653 int off; 654 int len; 655 struct fdt_property *prop; 656 u32 *reg, *reg2; 657 int i; 658 659 for (i = 0; i < 2; i++) { 660 off = fdt_node_offset_by_compatible(blob, -1, compat[i]); 661 while (off != -FDT_ERR_NOTFOUND) { 662 int idx; 663 664 /* 665 * Found one compatible node, so fixup the size 666 * int its reg properties 667 */ 668 prop = fdt_get_property_w(blob, off, "reg", &len); 669 if (prop) { 670 int tuple_size = 3 * sizeof(reg); 671 672 /* 673 * There might be multiple reg-tuples, 674 * so loop through them all 675 */ 676 reg = reg2 = (u32 *)&prop->data[0]; 677 for (idx = 0; idx < (len / tuple_size); idx++) { 678 /* 679 * Update size in reg property 680 */ 681 reg[2] = flash_get_bank_size(reg[0], 682 idx); 683 684 /* 685 * Point to next reg tuple 686 */ 687 reg += 3; 688 } 689 690 fdt_setprop(blob, off, "reg", reg2, len); 691 } 692 693 /* Move to next compatible node */ 694 off = fdt_node_offset_by_compatible(blob, off, 695 compat[i]); 696 } 697 } 698 699 return 0; 700 } 701 #endif 702 703 int fdt_increase_size(void *fdt, int add_len) 704 { 705 int newlen; 706 707 newlen = fdt_totalsize(fdt) + add_len; 708 709 /* Open in place with a new len */ 710 return fdt_open_into(fdt, fdt, newlen); 711 } 712 713 #ifdef CONFIG_FDT_FIXUP_PARTITIONS 714 #include <jffs2/load_kernel.h> 715 #include <mtd_node.h> 716 717 struct reg_cell { 718 unsigned int r0; 719 unsigned int r1; 720 }; 721 722 int fdt_del_subnodes(const void *blob, int parent_offset) 723 { 724 int off, ndepth; 725 int ret; 726 727 for (ndepth = 0, off = fdt_next_node(blob, parent_offset, &ndepth); 728 (off >= 0) && (ndepth > 0); 729 off = fdt_next_node(blob, off, &ndepth)) { 730 if (ndepth == 1) { 731 debug("delete %s: offset: %x\n", 732 fdt_get_name(blob, off, 0), off); 733 ret = fdt_del_node((void *)blob, off); 734 if (ret < 0) { 735 printf("Can't delete node: %s\n", 736 fdt_strerror(ret)); 737 return ret; 738 } else { 739 ndepth = 0; 740 off = parent_offset; 741 } 742 } 743 } 744 return 0; 745 } 746 747 int fdt_del_partitions(void *blob, int parent_offset) 748 { 749 const void *prop; 750 int ndepth = 0; 751 int off; 752 int ret; 753 754 off = fdt_next_node(blob, parent_offset, &ndepth); 755 if (off > 0 && ndepth == 1) { 756 prop = fdt_getprop(blob, off, "label", NULL); 757 if (prop == NULL) { 758 /* 759 * Could not find label property, nand {}; node? 760 * Check subnode, delete partitions there if any. 761 */ 762 return fdt_del_partitions(blob, off); 763 } else { 764 ret = fdt_del_subnodes(blob, parent_offset); 765 if (ret < 0) { 766 printf("Can't remove subnodes: %s\n", 767 fdt_strerror(ret)); 768 return ret; 769 } 770 } 771 } 772 return 0; 773 } 774 775 int fdt_node_set_part_info(void *blob, int parent_offset, 776 struct mtd_device *dev) 777 { 778 struct list_head *pentry; 779 struct part_info *part; 780 struct reg_cell cell; 781 int off, ndepth = 0; 782 int part_num, ret; 783 char buf[64]; 784 785 ret = fdt_del_partitions(blob, parent_offset); 786 if (ret < 0) 787 return ret; 788 789 /* 790 * Check if it is nand {}; subnode, adjust 791 * the offset in this case 792 */ 793 off = fdt_next_node(blob, parent_offset, &ndepth); 794 if (off > 0 && ndepth == 1) 795 parent_offset = off; 796 797 part_num = 0; 798 list_for_each_prev(pentry, &dev->parts) { 799 int newoff; 800 801 part = list_entry(pentry, struct part_info, link); 802 803 debug("%2d: %-20s0x%08llx\t0x%08llx\t%d\n", 804 part_num, part->name, part->size, 805 part->offset, part->mask_flags); 806 807 sprintf(buf, "partition@%llx", part->offset); 808 add_sub: 809 ret = fdt_add_subnode(blob, parent_offset, buf); 810 if (ret == -FDT_ERR_NOSPACE) { 811 ret = fdt_increase_size(blob, 512); 812 if (!ret) 813 goto add_sub; 814 else 815 goto err_size; 816 } else if (ret < 0) { 817 printf("Can't add partition node: %s\n", 818 fdt_strerror(ret)); 819 return ret; 820 } 821 newoff = ret; 822 823 /* Check MTD_WRITEABLE_CMD flag */ 824 if (part->mask_flags & 1) { 825 add_ro: 826 ret = fdt_setprop(blob, newoff, "read_only", NULL, 0); 827 if (ret == -FDT_ERR_NOSPACE) { 828 ret = fdt_increase_size(blob, 512); 829 if (!ret) 830 goto add_ro; 831 else 832 goto err_size; 833 } else if (ret < 0) 834 goto err_prop; 835 } 836 837 cell.r0 = cpu_to_fdt32(part->offset); 838 cell.r1 = cpu_to_fdt32(part->size); 839 add_reg: 840 ret = fdt_setprop(blob, newoff, "reg", &cell, sizeof(cell)); 841 if (ret == -FDT_ERR_NOSPACE) { 842 ret = fdt_increase_size(blob, 512); 843 if (!ret) 844 goto add_reg; 845 else 846 goto err_size; 847 } else if (ret < 0) 848 goto err_prop; 849 850 add_label: 851 ret = fdt_setprop_string(blob, newoff, "label", part->name); 852 if (ret == -FDT_ERR_NOSPACE) { 853 ret = fdt_increase_size(blob, 512); 854 if (!ret) 855 goto add_label; 856 else 857 goto err_size; 858 } else if (ret < 0) 859 goto err_prop; 860 861 part_num++; 862 } 863 return 0; 864 err_size: 865 printf("Can't increase blob size: %s\n", fdt_strerror(ret)); 866 return ret; 867 err_prop: 868 printf("Can't add property: %s\n", fdt_strerror(ret)); 869 return ret; 870 } 871 872 /* 873 * Update partitions in nor/nand nodes using info from 874 * mtdparts environment variable. The nodes to update are 875 * specified by node_info structure which contains mtd device 876 * type and compatible string: E. g. the board code in 877 * ft_board_setup() could use: 878 * 879 * struct node_info nodes[] = { 880 * { "fsl,mpc5121-nfc", MTD_DEV_TYPE_NAND, }, 881 * { "cfi-flash", MTD_DEV_TYPE_NOR, }, 882 * }; 883 * 884 * fdt_fixup_mtdparts(blob, nodes, ARRAY_SIZE(nodes)); 885 */ 886 void fdt_fixup_mtdparts(void *blob, void *node_info, int node_info_size) 887 { 888 struct node_info *ni = node_info; 889 struct mtd_device *dev; 890 char *parts; 891 int i, idx; 892 int noff; 893 894 parts = getenv("mtdparts"); 895 if (!parts) 896 return; 897 898 if (mtdparts_init() != 0) 899 return; 900 901 for (i = 0; i < node_info_size; i++) { 902 idx = 0; 903 noff = fdt_node_offset_by_compatible(blob, -1, ni[i].compat); 904 while (noff != -FDT_ERR_NOTFOUND) { 905 debug("%s: %s, mtd dev type %d\n", 906 fdt_get_name(blob, noff, 0), 907 ni[i].compat, ni[i].type); 908 dev = device_find(ni[i].type, idx++); 909 if (dev) { 910 if (fdt_node_set_part_info(blob, noff, dev)) 911 return; /* return on error */ 912 } 913 914 /* Jump to next flash node */ 915 noff = fdt_node_offset_by_compatible(blob, noff, 916 ni[i].compat); 917 } 918 } 919 } 920 #endif 921 922 void fdt_del_node_and_alias(void *blob, const char *alias) 923 { 924 int off = fdt_path_offset(blob, alias); 925 926 if (off < 0) 927 return; 928 929 fdt_del_node(blob, off); 930 931 off = fdt_path_offset(blob, "/aliases"); 932 fdt_delprop(blob, off, alias); 933 } 934 935 /* Helper to read a big number; size is in cells (not bytes) */ 936 static inline u64 of_read_number(const fdt32_t *cell, int size) 937 { 938 u64 r = 0; 939 while (size--) 940 r = (r << 32) | fdt32_to_cpu(*(cell++)); 941 return r; 942 } 943 944 #define PRu64 "%llx" 945 946 /* Max address size we deal with */ 947 #define OF_MAX_ADDR_CELLS 4 948 #define OF_BAD_ADDR ((u64)-1) 949 #define OF_CHECK_COUNTS(na, ns) ((na) > 0 && (na) <= OF_MAX_ADDR_CELLS && \ 950 (ns) > 0) 951 952 /* Debug utility */ 953 #ifdef DEBUG 954 static void of_dump_addr(const char *s, const fdt32_t *addr, int na) 955 { 956 printf("%s", s); 957 while(na--) 958 printf(" %08x", *(addr++)); 959 printf("\n"); 960 } 961 #else 962 static void of_dump_addr(const char *s, const fdt32_t *addr, int na) { } 963 #endif 964 965 /* Callbacks for bus specific translators */ 966 struct of_bus { 967 const char *name; 968 const char *addresses; 969 void (*count_cells)(void *blob, int parentoffset, 970 int *addrc, int *sizec); 971 u64 (*map)(fdt32_t *addr, const fdt32_t *range, 972 int na, int ns, int pna); 973 int (*translate)(fdt32_t *addr, u64 offset, int na); 974 }; 975 976 /* Default translator (generic bus) */ 977 static void of_bus_default_count_cells(void *blob, int parentoffset, 978 int *addrc, int *sizec) 979 { 980 const fdt32_t *prop; 981 982 if (addrc) { 983 prop = fdt_getprop(blob, parentoffset, "#address-cells", NULL); 984 if (prop) 985 *addrc = be32_to_cpup(prop); 986 else 987 *addrc = 2; 988 } 989 990 if (sizec) { 991 prop = fdt_getprop(blob, parentoffset, "#size-cells", NULL); 992 if (prop) 993 *sizec = be32_to_cpup(prop); 994 else 995 *sizec = 1; 996 } 997 } 998 999 static u64 of_bus_default_map(fdt32_t *addr, const fdt32_t *range, 1000 int na, int ns, int pna) 1001 { 1002 u64 cp, s, da; 1003 1004 cp = of_read_number(range, na); 1005 s = of_read_number(range + na + pna, ns); 1006 da = of_read_number(addr, na); 1007 1008 debug("OF: default map, cp="PRu64", s="PRu64", da="PRu64"\n", 1009 cp, s, da); 1010 1011 if (da < cp || da >= (cp + s)) 1012 return OF_BAD_ADDR; 1013 return da - cp; 1014 } 1015 1016 static int of_bus_default_translate(fdt32_t *addr, u64 offset, int na) 1017 { 1018 u64 a = of_read_number(addr, na); 1019 memset(addr, 0, na * 4); 1020 a += offset; 1021 if (na > 1) 1022 addr[na - 2] = cpu_to_fdt32(a >> 32); 1023 addr[na - 1] = cpu_to_fdt32(a & 0xffffffffu); 1024 1025 return 0; 1026 } 1027 1028 /* Array of bus specific translators */ 1029 static struct of_bus of_busses[] = { 1030 /* Default */ 1031 { 1032 .name = "default", 1033 .addresses = "reg", 1034 .count_cells = of_bus_default_count_cells, 1035 .map = of_bus_default_map, 1036 .translate = of_bus_default_translate, 1037 }, 1038 }; 1039 1040 static int of_translate_one(void * blob, int parent, struct of_bus *bus, 1041 struct of_bus *pbus, fdt32_t *addr, 1042 int na, int ns, int pna, const char *rprop) 1043 { 1044 const fdt32_t *ranges; 1045 int rlen; 1046 int rone; 1047 u64 offset = OF_BAD_ADDR; 1048 1049 /* Normally, an absence of a "ranges" property means we are 1050 * crossing a non-translatable boundary, and thus the addresses 1051 * below the current not cannot be converted to CPU physical ones. 1052 * Unfortunately, while this is very clear in the spec, it's not 1053 * what Apple understood, and they do have things like /uni-n or 1054 * /ht nodes with no "ranges" property and a lot of perfectly 1055 * useable mapped devices below them. Thus we treat the absence of 1056 * "ranges" as equivalent to an empty "ranges" property which means 1057 * a 1:1 translation at that level. It's up to the caller not to try 1058 * to translate addresses that aren't supposed to be translated in 1059 * the first place. --BenH. 1060 */ 1061 ranges = fdt_getprop(blob, parent, rprop, &rlen); 1062 if (ranges == NULL || rlen == 0) { 1063 offset = of_read_number(addr, na); 1064 memset(addr, 0, pna * 4); 1065 debug("OF: no ranges, 1:1 translation\n"); 1066 goto finish; 1067 } 1068 1069 debug("OF: walking ranges...\n"); 1070 1071 /* Now walk through the ranges */ 1072 rlen /= 4; 1073 rone = na + pna + ns; 1074 for (; rlen >= rone; rlen -= rone, ranges += rone) { 1075 offset = bus->map(addr, ranges, na, ns, pna); 1076 if (offset != OF_BAD_ADDR) 1077 break; 1078 } 1079 if (offset == OF_BAD_ADDR) { 1080 debug("OF: not found !\n"); 1081 return 1; 1082 } 1083 memcpy(addr, ranges + na, 4 * pna); 1084 1085 finish: 1086 of_dump_addr("OF: parent translation for:", addr, pna); 1087 debug("OF: with offset: "PRu64"\n", offset); 1088 1089 /* Translate it into parent bus space */ 1090 return pbus->translate(addr, offset, pna); 1091 } 1092 1093 /* 1094 * Translate an address from the device-tree into a CPU physical address, 1095 * this walks up the tree and applies the various bus mappings on the 1096 * way. 1097 * 1098 * Note: We consider that crossing any level with #size-cells == 0 to mean 1099 * that translation is impossible (that is we are not dealing with a value 1100 * that can be mapped to a cpu physical address). This is not really specified 1101 * that way, but this is traditionally the way IBM at least do things 1102 */ 1103 static u64 __of_translate_address(void *blob, int node_offset, const fdt32_t *in_addr, 1104 const char *rprop) 1105 { 1106 int parent; 1107 struct of_bus *bus, *pbus; 1108 fdt32_t addr[OF_MAX_ADDR_CELLS]; 1109 int na, ns, pna, pns; 1110 u64 result = OF_BAD_ADDR; 1111 1112 debug("OF: ** translation for device %s **\n", 1113 fdt_get_name(blob, node_offset, NULL)); 1114 1115 /* Get parent & match bus type */ 1116 parent = fdt_parent_offset(blob, node_offset); 1117 if (parent < 0) 1118 goto bail; 1119 bus = &of_busses[0]; 1120 1121 /* Cound address cells & copy address locally */ 1122 bus->count_cells(blob, parent, &na, &ns); 1123 if (!OF_CHECK_COUNTS(na, ns)) { 1124 printf("%s: Bad cell count for %s\n", __FUNCTION__, 1125 fdt_get_name(blob, node_offset, NULL)); 1126 goto bail; 1127 } 1128 memcpy(addr, in_addr, na * 4); 1129 1130 debug("OF: bus is %s (na=%d, ns=%d) on %s\n", 1131 bus->name, na, ns, fdt_get_name(blob, parent, NULL)); 1132 of_dump_addr("OF: translating address:", addr, na); 1133 1134 /* Translate */ 1135 for (;;) { 1136 /* Switch to parent bus */ 1137 node_offset = parent; 1138 parent = fdt_parent_offset(blob, node_offset); 1139 1140 /* If root, we have finished */ 1141 if (parent < 0) { 1142 debug("OF: reached root node\n"); 1143 result = of_read_number(addr, na); 1144 break; 1145 } 1146 1147 /* Get new parent bus and counts */ 1148 pbus = &of_busses[0]; 1149 pbus->count_cells(blob, parent, &pna, &pns); 1150 if (!OF_CHECK_COUNTS(pna, pns)) { 1151 printf("%s: Bad cell count for %s\n", __FUNCTION__, 1152 fdt_get_name(blob, node_offset, NULL)); 1153 break; 1154 } 1155 1156 debug("OF: parent bus is %s (na=%d, ns=%d) on %s\n", 1157 pbus->name, pna, pns, fdt_get_name(blob, parent, NULL)); 1158 1159 /* Apply bus translation */ 1160 if (of_translate_one(blob, node_offset, bus, pbus, 1161 addr, na, ns, pna, rprop)) 1162 break; 1163 1164 /* Complete the move up one level */ 1165 na = pna; 1166 ns = pns; 1167 bus = pbus; 1168 1169 of_dump_addr("OF: one level translation:", addr, na); 1170 } 1171 bail: 1172 1173 return result; 1174 } 1175 1176 u64 fdt_translate_address(void *blob, int node_offset, const fdt32_t *in_addr) 1177 { 1178 return __of_translate_address(blob, node_offset, in_addr, "ranges"); 1179 } 1180 1181 /** 1182 * fdt_node_offset_by_compat_reg: Find a node that matches compatiable and 1183 * who's reg property matches a physical cpu address 1184 * 1185 * @blob: ptr to device tree 1186 * @compat: compatiable string to match 1187 * @compat_off: property name 1188 * 1189 */ 1190 int fdt_node_offset_by_compat_reg(void *blob, const char *compat, 1191 phys_addr_t compat_off) 1192 { 1193 int len, off = fdt_node_offset_by_compatible(blob, -1, compat); 1194 while (off != -FDT_ERR_NOTFOUND) { 1195 const fdt32_t *reg = fdt_getprop(blob, off, "reg", &len); 1196 if (reg) { 1197 if (compat_off == fdt_translate_address(blob, off, reg)) 1198 return off; 1199 } 1200 off = fdt_node_offset_by_compatible(blob, off, compat); 1201 } 1202 1203 return -FDT_ERR_NOTFOUND; 1204 } 1205 1206 /** 1207 * fdt_alloc_phandle: Return next free phandle value 1208 * 1209 * @blob: ptr to device tree 1210 */ 1211 int fdt_alloc_phandle(void *blob) 1212 { 1213 int offset, phandle = 0; 1214 1215 for (offset = fdt_next_node(blob, -1, NULL); offset >= 0; 1216 offset = fdt_next_node(blob, offset, NULL)) { 1217 phandle = max(phandle, fdt_get_phandle(blob, offset)); 1218 } 1219 1220 return phandle + 1; 1221 } 1222 1223 /* 1224 * fdt_set_phandle: Create a phandle property for the given node 1225 * 1226 * @fdt: ptr to device tree 1227 * @nodeoffset: node to update 1228 * @phandle: phandle value to set (must be unique) 1229 */ 1230 int fdt_set_phandle(void *fdt, int nodeoffset, uint32_t phandle) 1231 { 1232 int ret; 1233 1234 #ifdef DEBUG 1235 int off = fdt_node_offset_by_phandle(fdt, phandle); 1236 1237 if ((off >= 0) && (off != nodeoffset)) { 1238 char buf[64]; 1239 1240 fdt_get_path(fdt, nodeoffset, buf, sizeof(buf)); 1241 printf("Trying to update node %s with phandle %u ", 1242 buf, phandle); 1243 1244 fdt_get_path(fdt, off, buf, sizeof(buf)); 1245 printf("that already exists in node %s.\n", buf); 1246 return -FDT_ERR_BADPHANDLE; 1247 } 1248 #endif 1249 1250 ret = fdt_setprop_cell(fdt, nodeoffset, "phandle", phandle); 1251 if (ret < 0) 1252 return ret; 1253 1254 /* 1255 * For now, also set the deprecated "linux,phandle" property, so that we 1256 * don't break older kernels. 1257 */ 1258 ret = fdt_setprop_cell(fdt, nodeoffset, "linux,phandle", phandle); 1259 1260 return ret; 1261 } 1262 1263 /* 1264 * fdt_create_phandle: Create a phandle property for the given node 1265 * 1266 * @fdt: ptr to device tree 1267 * @nodeoffset: node to update 1268 */ 1269 unsigned int fdt_create_phandle(void *fdt, int nodeoffset) 1270 { 1271 /* see if there is a phandle already */ 1272 int phandle = fdt_get_phandle(fdt, nodeoffset); 1273 1274 /* if we got 0, means no phandle so create one */ 1275 if (phandle == 0) { 1276 int ret; 1277 1278 phandle = fdt_alloc_phandle(fdt); 1279 ret = fdt_set_phandle(fdt, nodeoffset, phandle); 1280 if (ret < 0) { 1281 printf("Can't set phandle %u: %s\n", phandle, 1282 fdt_strerror(ret)); 1283 return 0; 1284 } 1285 } 1286 1287 return phandle; 1288 } 1289 1290 /* 1291 * fdt_set_node_status: Set status for the given node 1292 * 1293 * @fdt: ptr to device tree 1294 * @nodeoffset: node to update 1295 * @status: FDT_STATUS_OKAY, FDT_STATUS_DISABLED, 1296 * FDT_STATUS_FAIL, FDT_STATUS_FAIL_ERROR_CODE 1297 * @error_code: optional, only used if status is FDT_STATUS_FAIL_ERROR_CODE 1298 */ 1299 int fdt_set_node_status(void *fdt, int nodeoffset, 1300 enum fdt_status status, unsigned int error_code) 1301 { 1302 char buf[16]; 1303 int ret = 0; 1304 1305 if (nodeoffset < 0) 1306 return nodeoffset; 1307 1308 switch (status) { 1309 case FDT_STATUS_OKAY: 1310 ret = fdt_setprop_string(fdt, nodeoffset, "status", "okay"); 1311 break; 1312 case FDT_STATUS_DISABLED: 1313 ret = fdt_setprop_string(fdt, nodeoffset, "status", "disabled"); 1314 break; 1315 case FDT_STATUS_FAIL: 1316 ret = fdt_setprop_string(fdt, nodeoffset, "status", "fail"); 1317 break; 1318 case FDT_STATUS_FAIL_ERROR_CODE: 1319 sprintf(buf, "fail-%d", error_code); 1320 ret = fdt_setprop_string(fdt, nodeoffset, "status", buf); 1321 break; 1322 default: 1323 printf("Invalid fdt status: %x\n", status); 1324 ret = -1; 1325 break; 1326 } 1327 1328 return ret; 1329 } 1330 1331 /* 1332 * fdt_set_status_by_alias: Set status for the given node given an alias 1333 * 1334 * @fdt: ptr to device tree 1335 * @alias: alias of node to update 1336 * @status: FDT_STATUS_OKAY, FDT_STATUS_DISABLED, 1337 * FDT_STATUS_FAIL, FDT_STATUS_FAIL_ERROR_CODE 1338 * @error_code: optional, only used if status is FDT_STATUS_FAIL_ERROR_CODE 1339 */ 1340 int fdt_set_status_by_alias(void *fdt, const char* alias, 1341 enum fdt_status status, unsigned int error_code) 1342 { 1343 int offset = fdt_path_offset(fdt, alias); 1344 1345 return fdt_set_node_status(fdt, offset, status, error_code); 1346 } 1347 1348 #if defined(CONFIG_VIDEO) || defined(CONFIG_LCD) 1349 int fdt_add_edid(void *blob, const char *compat, unsigned char *edid_buf) 1350 { 1351 int noff; 1352 int ret; 1353 1354 noff = fdt_node_offset_by_compatible(blob, -1, compat); 1355 if (noff != -FDT_ERR_NOTFOUND) { 1356 debug("%s: %s\n", fdt_get_name(blob, noff, 0), compat); 1357 add_edid: 1358 ret = fdt_setprop(blob, noff, "edid", edid_buf, 128); 1359 if (ret == -FDT_ERR_NOSPACE) { 1360 ret = fdt_increase_size(blob, 512); 1361 if (!ret) 1362 goto add_edid; 1363 else 1364 goto err_size; 1365 } else if (ret < 0) { 1366 printf("Can't add property: %s\n", fdt_strerror(ret)); 1367 return ret; 1368 } 1369 } 1370 return 0; 1371 err_size: 1372 printf("Can't increase blob size: %s\n", fdt_strerror(ret)); 1373 return ret; 1374 } 1375 #endif 1376 1377 /* 1378 * Verify the physical address of device tree node for a given alias 1379 * 1380 * This function locates the device tree node of a given alias, and then 1381 * verifies that the physical address of that device matches the given 1382 * parameter. It displays a message if there is a mismatch. 1383 * 1384 * Returns 1 on success, 0 on failure 1385 */ 1386 int fdt_verify_alias_address(void *fdt, int anode, const char *alias, u64 addr) 1387 { 1388 const char *path; 1389 const fdt32_t *reg; 1390 int node, len; 1391 u64 dt_addr; 1392 1393 path = fdt_getprop(fdt, anode, alias, NULL); 1394 if (!path) { 1395 /* If there's no such alias, then it's not a failure */ 1396 return 1; 1397 } 1398 1399 node = fdt_path_offset(fdt, path); 1400 if (node < 0) { 1401 printf("Warning: device tree alias '%s' points to invalid " 1402 "node %s.\n", alias, path); 1403 return 0; 1404 } 1405 1406 reg = fdt_getprop(fdt, node, "reg", &len); 1407 if (!reg) { 1408 printf("Warning: device tree node '%s' has no address.\n", 1409 path); 1410 return 0; 1411 } 1412 1413 dt_addr = fdt_translate_address(fdt, node, reg); 1414 if (addr != dt_addr) { 1415 printf("Warning: U-Boot configured device %s at address %llx,\n" 1416 " but the device tree has it address %llx.\n", 1417 alias, addr, dt_addr); 1418 return 0; 1419 } 1420 1421 return 1; 1422 } 1423 1424 /* 1425 * Returns the base address of an SOC or PCI node 1426 */ 1427 u64 fdt_get_base_address(void *fdt, int node) 1428 { 1429 int size; 1430 u32 naddr; 1431 const fdt32_t *prop; 1432 1433 prop = fdt_getprop(fdt, node, "#address-cells", &size); 1434 if (prop && size == 4) 1435 naddr = be32_to_cpup(prop); 1436 else 1437 naddr = 2; 1438 1439 prop = fdt_getprop(fdt, node, "ranges", &size); 1440 1441 return prop ? fdt_translate_address(fdt, node, prop + naddr) : 0; 1442 } 1443 1444 /* 1445 * Read a property of size <prop_len>. Currently only supports 1 or 2 cells. 1446 */ 1447 static int fdt_read_prop(const fdt32_t *prop, int prop_len, int cell_off, 1448 uint64_t *val, int cells) 1449 { 1450 const fdt32_t *prop32 = &prop[cell_off]; 1451 const fdt64_t *prop64 = (const fdt64_t *)&prop[cell_off]; 1452 1453 if ((cell_off + cells) > prop_len) 1454 return -FDT_ERR_NOSPACE; 1455 1456 switch (cells) { 1457 case 1: 1458 *val = fdt32_to_cpu(*prop32); 1459 break; 1460 case 2: 1461 *val = fdt64_to_cpu(*prop64); 1462 break; 1463 default: 1464 return -FDT_ERR_NOSPACE; 1465 } 1466 1467 return 0; 1468 } 1469 1470 /** 1471 * fdt_read_range - Read a node's n'th range property 1472 * 1473 * @fdt: ptr to device tree 1474 * @node: offset of node 1475 * @n: range index 1476 * @child_addr: pointer to storage for the "child address" field 1477 * @addr: pointer to storage for the CPU view translated physical start 1478 * @len: pointer to storage for the range length 1479 * 1480 * Convenience function that reads and interprets a specific range out of 1481 * a number of the "ranges" property array. 1482 */ 1483 int fdt_read_range(void *fdt, int node, int n, uint64_t *child_addr, 1484 uint64_t *addr, uint64_t *len) 1485 { 1486 int pnode = fdt_parent_offset(fdt, node); 1487 const fdt32_t *ranges; 1488 int pacells; 1489 int acells; 1490 int scells; 1491 int ranges_len; 1492 int cell = 0; 1493 int r = 0; 1494 1495 /* 1496 * The "ranges" property is an array of 1497 * { <child address> <parent address> <size in child address space> } 1498 * 1499 * All 3 elements can span a diffent number of cells. Fetch their size. 1500 */ 1501 pacells = fdt_getprop_u32_default_node(fdt, pnode, 0, "#address-cells", 1); 1502 acells = fdt_getprop_u32_default_node(fdt, node, 0, "#address-cells", 1); 1503 scells = fdt_getprop_u32_default_node(fdt, node, 0, "#size-cells", 1); 1504 1505 /* Now try to get the ranges property */ 1506 ranges = fdt_getprop(fdt, node, "ranges", &ranges_len); 1507 if (!ranges) 1508 return -FDT_ERR_NOTFOUND; 1509 ranges_len /= sizeof(uint32_t); 1510 1511 /* Jump to the n'th entry */ 1512 cell = n * (pacells + acells + scells); 1513 1514 /* Read <child address> */ 1515 if (child_addr) { 1516 r = fdt_read_prop(ranges, ranges_len, cell, child_addr, 1517 acells); 1518 if (r) 1519 return r; 1520 } 1521 cell += acells; 1522 1523 /* Read <parent address> */ 1524 if (addr) 1525 *addr = fdt_translate_address(fdt, node, ranges + cell); 1526 cell += pacells; 1527 1528 /* Read <size in child address space> */ 1529 if (len) { 1530 r = fdt_read_prop(ranges, ranges_len, cell, len, scells); 1531 if (r) 1532 return r; 1533 } 1534 1535 return 0; 1536 } 1537