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, int force) 207 { 208 int nodeoffset, addr_cell_len; 209 int err, j, total; 210 fdt64_t tmp; 211 const char *path; 212 uint64_t addr, size; 213 214 /* find or create "/chosen" node. */ 215 nodeoffset = fdt_find_or_add_subnode(fdt, 0, "chosen"); 216 if (nodeoffset < 0) 217 return nodeoffset; 218 219 /* just return if initrd_start/end aren't valid */ 220 if ((initrd_start == 0) || (initrd_end == 0)) 221 return 0; 222 223 total = fdt_num_mem_rsv(fdt); 224 225 /* 226 * Look for an existing entry and update it. If we don't find 227 * the entry, we will j be the next available slot. 228 */ 229 for (j = 0; j < total; j++) { 230 err = fdt_get_mem_rsv(fdt, j, &addr, &size); 231 if (addr == initrd_start) { 232 fdt_del_mem_rsv(fdt, j); 233 break; 234 } 235 } 236 237 err = fdt_add_mem_rsv(fdt, initrd_start, initrd_end - initrd_start); 238 if (err < 0) { 239 printf("fdt_initrd: %s\n", fdt_strerror(err)); 240 return err; 241 } 242 243 addr_cell_len = get_cells_len(fdt, "#address-cells"); 244 245 path = fdt_getprop(fdt, nodeoffset, "linux,initrd-start", NULL); 246 if ((path == NULL) || force) { 247 write_cell((u8 *)&tmp, initrd_start, addr_cell_len); 248 err = fdt_setprop(fdt, nodeoffset, 249 "linux,initrd-start", &tmp, addr_cell_len); 250 if (err < 0) { 251 printf("WARNING: " 252 "could not set linux,initrd-start %s.\n", 253 fdt_strerror(err)); 254 return err; 255 } 256 write_cell((u8 *)&tmp, initrd_end, addr_cell_len); 257 err = fdt_setprop(fdt, nodeoffset, 258 "linux,initrd-end", &tmp, addr_cell_len); 259 if (err < 0) { 260 printf("WARNING: could not set linux,initrd-end %s.\n", 261 fdt_strerror(err)); 262 263 return err; 264 } 265 } 266 267 return 0; 268 } 269 270 int fdt_chosen(void *fdt, int force) 271 { 272 int nodeoffset; 273 int err; 274 char *str; /* used to set string properties */ 275 const char *path; 276 277 err = fdt_check_header(fdt); 278 if (err < 0) { 279 printf("fdt_chosen: %s\n", fdt_strerror(err)); 280 return err; 281 } 282 283 /* find or create "/chosen" node. */ 284 nodeoffset = fdt_find_or_add_subnode(fdt, 0, "chosen"); 285 if (nodeoffset < 0) 286 return nodeoffset; 287 288 /* 289 * Create /chosen properites that don't exist in the fdt. 290 * If the property exists, update it only if the "force" parameter 291 * is true. 292 */ 293 str = getenv("bootargs"); 294 if (str != NULL) { 295 path = fdt_getprop(fdt, nodeoffset, "bootargs", NULL); 296 if ((path == NULL) || force) { 297 err = fdt_setprop(fdt, nodeoffset, 298 "bootargs", str, strlen(str)+1); 299 if (err < 0) 300 printf("WARNING: could not set bootargs %s.\n", 301 fdt_strerror(err)); 302 } 303 } 304 305 #ifdef CONFIG_OF_STDOUT_VIA_ALIAS 306 path = fdt_getprop(fdt, nodeoffset, "linux,stdout-path", NULL); 307 if ((path == NULL) || force) 308 err = fdt_fixup_stdout(fdt, nodeoffset); 309 #endif 310 311 #ifdef OF_STDOUT_PATH 312 path = fdt_getprop(fdt, nodeoffset, "linux,stdout-path", NULL); 313 if ((path == NULL) || force) { 314 err = fdt_setprop(fdt, nodeoffset, 315 "linux,stdout-path", OF_STDOUT_PATH, strlen(OF_STDOUT_PATH)+1); 316 if (err < 0) 317 printf("WARNING: could not set linux,stdout-path %s.\n", 318 fdt_strerror(err)); 319 } 320 #endif 321 322 return err; 323 } 324 325 void do_fixup_by_path(void *fdt, const char *path, const char *prop, 326 const void *val, int len, int create) 327 { 328 #if defined(DEBUG) 329 int i; 330 debug("Updating property '%s/%s' = ", path, prop); 331 for (i = 0; i < len; i++) 332 debug(" %.2x", *(u8*)(val+i)); 333 debug("\n"); 334 #endif 335 int rc = fdt_find_and_setprop(fdt, path, prop, val, len, create); 336 if (rc) 337 printf("Unable to update property %s:%s, err=%s\n", 338 path, prop, fdt_strerror(rc)); 339 } 340 341 void do_fixup_by_path_u32(void *fdt, const char *path, const char *prop, 342 u32 val, int create) 343 { 344 fdt32_t tmp = cpu_to_fdt32(val); 345 do_fixup_by_path(fdt, path, prop, &tmp, sizeof(tmp), create); 346 } 347 348 void do_fixup_by_prop(void *fdt, 349 const char *pname, const void *pval, int plen, 350 const char *prop, const void *val, int len, 351 int create) 352 { 353 int off; 354 #if defined(DEBUG) 355 int i; 356 debug("Updating property '%s' = ", prop); 357 for (i = 0; i < len; i++) 358 debug(" %.2x", *(u8*)(val+i)); 359 debug("\n"); 360 #endif 361 off = fdt_node_offset_by_prop_value(fdt, -1, pname, pval, plen); 362 while (off != -FDT_ERR_NOTFOUND) { 363 if (create || (fdt_get_property(fdt, off, prop, NULL) != NULL)) 364 fdt_setprop(fdt, off, prop, val, len); 365 off = fdt_node_offset_by_prop_value(fdt, off, pname, pval, plen); 366 } 367 } 368 369 void do_fixup_by_prop_u32(void *fdt, 370 const char *pname, const void *pval, int plen, 371 const char *prop, u32 val, int create) 372 { 373 fdt32_t tmp = cpu_to_fdt32(val); 374 do_fixup_by_prop(fdt, pname, pval, plen, prop, &tmp, 4, create); 375 } 376 377 void do_fixup_by_compat(void *fdt, const char *compat, 378 const char *prop, const void *val, int len, int create) 379 { 380 int off = -1; 381 #if defined(DEBUG) 382 int i; 383 debug("Updating property '%s' = ", prop); 384 for (i = 0; i < len; i++) 385 debug(" %.2x", *(u8*)(val+i)); 386 debug("\n"); 387 #endif 388 off = fdt_node_offset_by_compatible(fdt, -1, compat); 389 while (off != -FDT_ERR_NOTFOUND) { 390 if (create || (fdt_get_property(fdt, off, prop, NULL) != NULL)) 391 fdt_setprop(fdt, off, prop, val, len); 392 off = fdt_node_offset_by_compatible(fdt, off, compat); 393 } 394 } 395 396 void do_fixup_by_compat_u32(void *fdt, const char *compat, 397 const char *prop, u32 val, int create) 398 { 399 fdt32_t tmp = cpu_to_fdt32(val); 400 do_fixup_by_compat(fdt, compat, prop, &tmp, 4, create); 401 } 402 403 #ifdef CONFIG_NR_DRAM_BANKS 404 #define MEMORY_BANKS_MAX CONFIG_NR_DRAM_BANKS 405 #else 406 #define MEMORY_BANKS_MAX 4 407 #endif 408 int fdt_fixup_memory_banks(void *blob, u64 start[], u64 size[], int banks) 409 { 410 int err, nodeoffset; 411 int addr_cell_len, size_cell_len, len; 412 u8 tmp[MEMORY_BANKS_MAX * 16]; /* Up to 64-bit address + 64-bit size */ 413 int bank; 414 415 if (banks > MEMORY_BANKS_MAX) { 416 printf("%s: num banks %d exceeds hardcoded limit %d." 417 " Recompile with higher MEMORY_BANKS_MAX?\n", 418 __FUNCTION__, banks, MEMORY_BANKS_MAX); 419 return -1; 420 } 421 422 err = fdt_check_header(blob); 423 if (err < 0) { 424 printf("%s: %s\n", __FUNCTION__, fdt_strerror(err)); 425 return err; 426 } 427 428 /* find or create "/memory" node. */ 429 nodeoffset = fdt_find_or_add_subnode(blob, 0, "memory"); 430 if (nodeoffset < 0) 431 return nodeoffset; 432 433 err = fdt_setprop(blob, nodeoffset, "device_type", "memory", 434 sizeof("memory")); 435 if (err < 0) { 436 printf("WARNING: could not set %s %s.\n", "device_type", 437 fdt_strerror(err)); 438 return err; 439 } 440 441 addr_cell_len = get_cells_len(blob, "#address-cells"); 442 size_cell_len = get_cells_len(blob, "#size-cells"); 443 444 for (bank = 0, len = 0; bank < banks; bank++) { 445 write_cell(tmp + len, start[bank], addr_cell_len); 446 len += addr_cell_len; 447 448 write_cell(tmp + len, size[bank], size_cell_len); 449 len += size_cell_len; 450 } 451 452 err = fdt_setprop(blob, nodeoffset, "reg", tmp, len); 453 if (err < 0) { 454 printf("WARNING: could not set %s %s.\n", 455 "reg", fdt_strerror(err)); 456 return err; 457 } 458 return 0; 459 } 460 461 int fdt_fixup_memory(void *blob, u64 start, u64 size) 462 { 463 return fdt_fixup_memory_banks(blob, &start, &size, 1); 464 } 465 466 void fdt_fixup_ethernet(void *fdt) 467 { 468 int node, i, j; 469 char enet[16], *tmp, *end; 470 char mac[16]; 471 const char *path; 472 unsigned char mac_addr[6]; 473 474 node = fdt_path_offset(fdt, "/aliases"); 475 if (node < 0) 476 return; 477 478 if (!getenv("ethaddr")) { 479 if (getenv("usbethaddr")) { 480 strcpy(mac, "usbethaddr"); 481 } else { 482 debug("No ethernet MAC Address defined\n"); 483 return; 484 } 485 } else { 486 strcpy(mac, "ethaddr"); 487 } 488 489 i = 0; 490 while ((tmp = getenv(mac)) != NULL) { 491 sprintf(enet, "ethernet%d", i); 492 path = fdt_getprop(fdt, node, enet, NULL); 493 if (!path) { 494 debug("No alias for %s\n", enet); 495 sprintf(mac, "eth%daddr", ++i); 496 continue; 497 } 498 499 for (j = 0; j < 6; j++) { 500 mac_addr[j] = tmp ? simple_strtoul(tmp, &end, 16) : 0; 501 if (tmp) 502 tmp = (*end) ? end+1 : end; 503 } 504 505 do_fixup_by_path(fdt, path, "mac-address", &mac_addr, 6, 0); 506 do_fixup_by_path(fdt, path, "local-mac-address", 507 &mac_addr, 6, 1); 508 509 sprintf(mac, "eth%daddr", ++i); 510 } 511 } 512 513 /* Resize the fdt to its actual size + a bit of padding */ 514 int fdt_resize(void *blob) 515 { 516 int i; 517 uint64_t addr, size; 518 int total, ret; 519 uint actualsize; 520 521 if (!blob) 522 return 0; 523 524 total = fdt_num_mem_rsv(blob); 525 for (i = 0; i < total; i++) { 526 fdt_get_mem_rsv(blob, i, &addr, &size); 527 if (addr == (uintptr_t)blob) { 528 fdt_del_mem_rsv(blob, i); 529 break; 530 } 531 } 532 533 /* 534 * Calculate the actual size of the fdt 535 * plus the size needed for 5 fdt_add_mem_rsv, one 536 * for the fdt itself and 4 for a possible initrd 537 * ((initrd-start + initrd-end) * 2 (name & value)) 538 */ 539 actualsize = fdt_off_dt_strings(blob) + 540 fdt_size_dt_strings(blob) + 5 * sizeof(struct fdt_reserve_entry); 541 542 /* Make it so the fdt ends on a page boundary */ 543 actualsize = ALIGN(actualsize + ((uintptr_t)blob & 0xfff), 0x1000); 544 actualsize = actualsize - ((uintptr_t)blob & 0xfff); 545 546 /* Change the fdt header to reflect the correct size */ 547 fdt_set_totalsize(blob, actualsize); 548 549 /* Add the new reservation */ 550 ret = fdt_add_mem_rsv(blob, (uintptr_t)blob, actualsize); 551 if (ret < 0) 552 return ret; 553 554 return actualsize; 555 } 556 557 #ifdef CONFIG_PCI 558 #define CONFIG_SYS_PCI_NR_INBOUND_WIN 4 559 560 #define FDT_PCI_PREFETCH (0x40000000) 561 #define FDT_PCI_MEM32 (0x02000000) 562 #define FDT_PCI_IO (0x01000000) 563 #define FDT_PCI_MEM64 (0x03000000) 564 565 int fdt_pci_dma_ranges(void *blob, int phb_off, struct pci_controller *hose) { 566 567 int addrcell, sizecell, len, r; 568 u32 *dma_range; 569 /* sized based on pci addr cells, size-cells, & address-cells */ 570 u32 dma_ranges[(3 + 2 + 2) * CONFIG_SYS_PCI_NR_INBOUND_WIN]; 571 572 addrcell = fdt_getprop_u32_default(blob, "/", "#address-cells", 1); 573 sizecell = fdt_getprop_u32_default(blob, "/", "#size-cells", 1); 574 575 dma_range = &dma_ranges[0]; 576 for (r = 0; r < hose->region_count; r++) { 577 u64 bus_start, phys_start, size; 578 579 /* skip if !PCI_REGION_SYS_MEMORY */ 580 if (!(hose->regions[r].flags & PCI_REGION_SYS_MEMORY)) 581 continue; 582 583 bus_start = (u64)hose->regions[r].bus_start; 584 phys_start = (u64)hose->regions[r].phys_start; 585 size = (u64)hose->regions[r].size; 586 587 dma_range[0] = 0; 588 if (size >= 0x100000000ull) 589 dma_range[0] |= FDT_PCI_MEM64; 590 else 591 dma_range[0] |= FDT_PCI_MEM32; 592 if (hose->regions[r].flags & PCI_REGION_PREFETCH) 593 dma_range[0] |= FDT_PCI_PREFETCH; 594 #ifdef CONFIG_SYS_PCI_64BIT 595 dma_range[1] = bus_start >> 32; 596 #else 597 dma_range[1] = 0; 598 #endif 599 dma_range[2] = bus_start & 0xffffffff; 600 601 if (addrcell == 2) { 602 dma_range[3] = phys_start >> 32; 603 dma_range[4] = phys_start & 0xffffffff; 604 } else { 605 dma_range[3] = phys_start & 0xffffffff; 606 } 607 608 if (sizecell == 2) { 609 dma_range[3 + addrcell + 0] = size >> 32; 610 dma_range[3 + addrcell + 1] = size & 0xffffffff; 611 } else { 612 dma_range[3 + addrcell + 0] = size & 0xffffffff; 613 } 614 615 dma_range += (3 + addrcell + sizecell); 616 } 617 618 len = dma_range - &dma_ranges[0]; 619 if (len) 620 fdt_setprop(blob, phb_off, "dma-ranges", &dma_ranges[0], len*4); 621 622 return 0; 623 } 624 #endif 625 626 #ifdef CONFIG_FDT_FIXUP_NOR_FLASH_SIZE 627 /* 628 * Provide a weak default function to return the flash bank size. 629 * There might be multiple non-identical flash chips connected to one 630 * chip-select, so we need to pass an index as well. 631 */ 632 u32 __flash_get_bank_size(int cs, int idx) 633 { 634 extern flash_info_t flash_info[]; 635 636 /* 637 * As default, a simple 1:1 mapping is provided. Boards with 638 * a different mapping need to supply a board specific mapping 639 * routine. 640 */ 641 return flash_info[cs].size; 642 } 643 u32 flash_get_bank_size(int cs, int idx) 644 __attribute__((weak, alias("__flash_get_bank_size"))); 645 646 /* 647 * This function can be used to update the size in the "reg" property 648 * of all NOR FLASH device nodes. This is necessary for boards with 649 * non-fixed NOR FLASH sizes. 650 */ 651 int fdt_fixup_nor_flash_size(void *blob) 652 { 653 char compat[][16] = { "cfi-flash", "jedec-flash" }; 654 int off; 655 int len; 656 struct fdt_property *prop; 657 u32 *reg, *reg2; 658 int i; 659 660 for (i = 0; i < 2; i++) { 661 off = fdt_node_offset_by_compatible(blob, -1, compat[i]); 662 while (off != -FDT_ERR_NOTFOUND) { 663 int idx; 664 665 /* 666 * Found one compatible node, so fixup the size 667 * int its reg properties 668 */ 669 prop = fdt_get_property_w(blob, off, "reg", &len); 670 if (prop) { 671 int tuple_size = 3 * sizeof(reg); 672 673 /* 674 * There might be multiple reg-tuples, 675 * so loop through them all 676 */ 677 reg = reg2 = (u32 *)&prop->data[0]; 678 for (idx = 0; idx < (len / tuple_size); idx++) { 679 /* 680 * Update size in reg property 681 */ 682 reg[2] = flash_get_bank_size(reg[0], 683 idx); 684 685 /* 686 * Point to next reg tuple 687 */ 688 reg += 3; 689 } 690 691 fdt_setprop(blob, off, "reg", reg2, len); 692 } 693 694 /* Move to next compatible node */ 695 off = fdt_node_offset_by_compatible(blob, off, 696 compat[i]); 697 } 698 } 699 700 return 0; 701 } 702 #endif 703 704 int fdt_increase_size(void *fdt, int add_len) 705 { 706 int newlen; 707 708 newlen = fdt_totalsize(fdt) + add_len; 709 710 /* Open in place with a new len */ 711 return fdt_open_into(fdt, fdt, newlen); 712 } 713 714 #ifdef CONFIG_FDT_FIXUP_PARTITIONS 715 #include <jffs2/load_kernel.h> 716 #include <mtd_node.h> 717 718 struct reg_cell { 719 unsigned int r0; 720 unsigned int r1; 721 }; 722 723 int fdt_del_subnodes(const void *blob, int parent_offset) 724 { 725 int off, ndepth; 726 int ret; 727 728 for (ndepth = 0, off = fdt_next_node(blob, parent_offset, &ndepth); 729 (off >= 0) && (ndepth > 0); 730 off = fdt_next_node(blob, off, &ndepth)) { 731 if (ndepth == 1) { 732 debug("delete %s: offset: %x\n", 733 fdt_get_name(blob, off, 0), off); 734 ret = fdt_del_node((void *)blob, off); 735 if (ret < 0) { 736 printf("Can't delete node: %s\n", 737 fdt_strerror(ret)); 738 return ret; 739 } else { 740 ndepth = 0; 741 off = parent_offset; 742 } 743 } 744 } 745 return 0; 746 } 747 748 int fdt_del_partitions(void *blob, int parent_offset) 749 { 750 const void *prop; 751 int ndepth = 0; 752 int off; 753 int ret; 754 755 off = fdt_next_node(blob, parent_offset, &ndepth); 756 if (off > 0 && ndepth == 1) { 757 prop = fdt_getprop(blob, off, "label", NULL); 758 if (prop == NULL) { 759 /* 760 * Could not find label property, nand {}; node? 761 * Check subnode, delete partitions there if any. 762 */ 763 return fdt_del_partitions(blob, off); 764 } else { 765 ret = fdt_del_subnodes(blob, parent_offset); 766 if (ret < 0) { 767 printf("Can't remove subnodes: %s\n", 768 fdt_strerror(ret)); 769 return ret; 770 } 771 } 772 } 773 return 0; 774 } 775 776 int fdt_node_set_part_info(void *blob, int parent_offset, 777 struct mtd_device *dev) 778 { 779 struct list_head *pentry; 780 struct part_info *part; 781 struct reg_cell cell; 782 int off, ndepth = 0; 783 int part_num, ret; 784 char buf[64]; 785 786 ret = fdt_del_partitions(blob, parent_offset); 787 if (ret < 0) 788 return ret; 789 790 /* 791 * Check if it is nand {}; subnode, adjust 792 * the offset in this case 793 */ 794 off = fdt_next_node(blob, parent_offset, &ndepth); 795 if (off > 0 && ndepth == 1) 796 parent_offset = off; 797 798 part_num = 0; 799 list_for_each_prev(pentry, &dev->parts) { 800 int newoff; 801 802 part = list_entry(pentry, struct part_info, link); 803 804 debug("%2d: %-20s0x%08llx\t0x%08llx\t%d\n", 805 part_num, part->name, part->size, 806 part->offset, part->mask_flags); 807 808 sprintf(buf, "partition@%llx", part->offset); 809 add_sub: 810 ret = fdt_add_subnode(blob, parent_offset, buf); 811 if (ret == -FDT_ERR_NOSPACE) { 812 ret = fdt_increase_size(blob, 512); 813 if (!ret) 814 goto add_sub; 815 else 816 goto err_size; 817 } else if (ret < 0) { 818 printf("Can't add partition node: %s\n", 819 fdt_strerror(ret)); 820 return ret; 821 } 822 newoff = ret; 823 824 /* Check MTD_WRITEABLE_CMD flag */ 825 if (part->mask_flags & 1) { 826 add_ro: 827 ret = fdt_setprop(blob, newoff, "read_only", NULL, 0); 828 if (ret == -FDT_ERR_NOSPACE) { 829 ret = fdt_increase_size(blob, 512); 830 if (!ret) 831 goto add_ro; 832 else 833 goto err_size; 834 } else if (ret < 0) 835 goto err_prop; 836 } 837 838 cell.r0 = cpu_to_fdt32(part->offset); 839 cell.r1 = cpu_to_fdt32(part->size); 840 add_reg: 841 ret = fdt_setprop(blob, newoff, "reg", &cell, sizeof(cell)); 842 if (ret == -FDT_ERR_NOSPACE) { 843 ret = fdt_increase_size(blob, 512); 844 if (!ret) 845 goto add_reg; 846 else 847 goto err_size; 848 } else if (ret < 0) 849 goto err_prop; 850 851 add_label: 852 ret = fdt_setprop_string(blob, newoff, "label", part->name); 853 if (ret == -FDT_ERR_NOSPACE) { 854 ret = fdt_increase_size(blob, 512); 855 if (!ret) 856 goto add_label; 857 else 858 goto err_size; 859 } else if (ret < 0) 860 goto err_prop; 861 862 part_num++; 863 } 864 return 0; 865 err_size: 866 printf("Can't increase blob size: %s\n", fdt_strerror(ret)); 867 return ret; 868 err_prop: 869 printf("Can't add property: %s\n", fdt_strerror(ret)); 870 return ret; 871 } 872 873 /* 874 * Update partitions in nor/nand nodes using info from 875 * mtdparts environment variable. The nodes to update are 876 * specified by node_info structure which contains mtd device 877 * type and compatible string: E. g. the board code in 878 * ft_board_setup() could use: 879 * 880 * struct node_info nodes[] = { 881 * { "fsl,mpc5121-nfc", MTD_DEV_TYPE_NAND, }, 882 * { "cfi-flash", MTD_DEV_TYPE_NOR, }, 883 * }; 884 * 885 * fdt_fixup_mtdparts(blob, nodes, ARRAY_SIZE(nodes)); 886 */ 887 void fdt_fixup_mtdparts(void *blob, void *node_info, int node_info_size) 888 { 889 struct node_info *ni = node_info; 890 struct mtd_device *dev; 891 char *parts; 892 int i, idx; 893 int noff; 894 895 parts = getenv("mtdparts"); 896 if (!parts) 897 return; 898 899 if (mtdparts_init() != 0) 900 return; 901 902 for (i = 0; i < node_info_size; i++) { 903 idx = 0; 904 noff = fdt_node_offset_by_compatible(blob, -1, ni[i].compat); 905 while (noff != -FDT_ERR_NOTFOUND) { 906 debug("%s: %s, mtd dev type %d\n", 907 fdt_get_name(blob, noff, 0), 908 ni[i].compat, ni[i].type); 909 dev = device_find(ni[i].type, idx++); 910 if (dev) { 911 if (fdt_node_set_part_info(blob, noff, dev)) 912 return; /* return on error */ 913 } 914 915 /* Jump to next flash node */ 916 noff = fdt_node_offset_by_compatible(blob, noff, 917 ni[i].compat); 918 } 919 } 920 } 921 #endif 922 923 void fdt_del_node_and_alias(void *blob, const char *alias) 924 { 925 int off = fdt_path_offset(blob, alias); 926 927 if (off < 0) 928 return; 929 930 fdt_del_node(blob, off); 931 932 off = fdt_path_offset(blob, "/aliases"); 933 fdt_delprop(blob, off, alias); 934 } 935 936 /* Helper to read a big number; size is in cells (not bytes) */ 937 static inline u64 of_read_number(const fdt32_t *cell, int size) 938 { 939 u64 r = 0; 940 while (size--) 941 r = (r << 32) | fdt32_to_cpu(*(cell++)); 942 return r; 943 } 944 945 #define PRu64 "%llx" 946 947 /* Max address size we deal with */ 948 #define OF_MAX_ADDR_CELLS 4 949 #define OF_BAD_ADDR ((u64)-1) 950 #define OF_CHECK_COUNTS(na, ns) ((na) > 0 && (na) <= OF_MAX_ADDR_CELLS && \ 951 (ns) > 0) 952 953 /* Debug utility */ 954 #ifdef DEBUG 955 static void of_dump_addr(const char *s, const fdt32_t *addr, int na) 956 { 957 printf("%s", s); 958 while(na--) 959 printf(" %08x", *(addr++)); 960 printf("\n"); 961 } 962 #else 963 static void of_dump_addr(const char *s, const fdt32_t *addr, int na) { } 964 #endif 965 966 /* Callbacks for bus specific translators */ 967 struct of_bus { 968 const char *name; 969 const char *addresses; 970 void (*count_cells)(void *blob, int parentoffset, 971 int *addrc, int *sizec); 972 u64 (*map)(fdt32_t *addr, const fdt32_t *range, 973 int na, int ns, int pna); 974 int (*translate)(fdt32_t *addr, u64 offset, int na); 975 }; 976 977 /* Default translator (generic bus) */ 978 static void of_bus_default_count_cells(void *blob, int parentoffset, 979 int *addrc, int *sizec) 980 { 981 const fdt32_t *prop; 982 983 if (addrc) { 984 prop = fdt_getprop(blob, parentoffset, "#address-cells", NULL); 985 if (prop) 986 *addrc = be32_to_cpup(prop); 987 else 988 *addrc = 2; 989 } 990 991 if (sizec) { 992 prop = fdt_getprop(blob, parentoffset, "#size-cells", NULL); 993 if (prop) 994 *sizec = be32_to_cpup(prop); 995 else 996 *sizec = 1; 997 } 998 } 999 1000 static u64 of_bus_default_map(fdt32_t *addr, const fdt32_t *range, 1001 int na, int ns, int pna) 1002 { 1003 u64 cp, s, da; 1004 1005 cp = of_read_number(range, na); 1006 s = of_read_number(range + na + pna, ns); 1007 da = of_read_number(addr, na); 1008 1009 debug("OF: default map, cp="PRu64", s="PRu64", da="PRu64"\n", 1010 cp, s, da); 1011 1012 if (da < cp || da >= (cp + s)) 1013 return OF_BAD_ADDR; 1014 return da - cp; 1015 } 1016 1017 static int of_bus_default_translate(fdt32_t *addr, u64 offset, int na) 1018 { 1019 u64 a = of_read_number(addr, na); 1020 memset(addr, 0, na * 4); 1021 a += offset; 1022 if (na > 1) 1023 addr[na - 2] = cpu_to_fdt32(a >> 32); 1024 addr[na - 1] = cpu_to_fdt32(a & 0xffffffffu); 1025 1026 return 0; 1027 } 1028 1029 /* Array of bus specific translators */ 1030 static struct of_bus of_busses[] = { 1031 /* Default */ 1032 { 1033 .name = "default", 1034 .addresses = "reg", 1035 .count_cells = of_bus_default_count_cells, 1036 .map = of_bus_default_map, 1037 .translate = of_bus_default_translate, 1038 }, 1039 }; 1040 1041 static int of_translate_one(void * blob, int parent, struct of_bus *bus, 1042 struct of_bus *pbus, fdt32_t *addr, 1043 int na, int ns, int pna, const char *rprop) 1044 { 1045 const fdt32_t *ranges; 1046 int rlen; 1047 int rone; 1048 u64 offset = OF_BAD_ADDR; 1049 1050 /* Normally, an absence of a "ranges" property means we are 1051 * crossing a non-translatable boundary, and thus the addresses 1052 * below the current not cannot be converted to CPU physical ones. 1053 * Unfortunately, while this is very clear in the spec, it's not 1054 * what Apple understood, and they do have things like /uni-n or 1055 * /ht nodes with no "ranges" property and a lot of perfectly 1056 * useable mapped devices below them. Thus we treat the absence of 1057 * "ranges" as equivalent to an empty "ranges" property which means 1058 * a 1:1 translation at that level. It's up to the caller not to try 1059 * to translate addresses that aren't supposed to be translated in 1060 * the first place. --BenH. 1061 */ 1062 ranges = fdt_getprop(blob, parent, rprop, &rlen); 1063 if (ranges == NULL || rlen == 0) { 1064 offset = of_read_number(addr, na); 1065 memset(addr, 0, pna * 4); 1066 debug("OF: no ranges, 1:1 translation\n"); 1067 goto finish; 1068 } 1069 1070 debug("OF: walking ranges...\n"); 1071 1072 /* Now walk through the ranges */ 1073 rlen /= 4; 1074 rone = na + pna + ns; 1075 for (; rlen >= rone; rlen -= rone, ranges += rone) { 1076 offset = bus->map(addr, ranges, na, ns, pna); 1077 if (offset != OF_BAD_ADDR) 1078 break; 1079 } 1080 if (offset == OF_BAD_ADDR) { 1081 debug("OF: not found !\n"); 1082 return 1; 1083 } 1084 memcpy(addr, ranges + na, 4 * pna); 1085 1086 finish: 1087 of_dump_addr("OF: parent translation for:", addr, pna); 1088 debug("OF: with offset: "PRu64"\n", offset); 1089 1090 /* Translate it into parent bus space */ 1091 return pbus->translate(addr, offset, pna); 1092 } 1093 1094 /* 1095 * Translate an address from the device-tree into a CPU physical address, 1096 * this walks up the tree and applies the various bus mappings on the 1097 * way. 1098 * 1099 * Note: We consider that crossing any level with #size-cells == 0 to mean 1100 * that translation is impossible (that is we are not dealing with a value 1101 * that can be mapped to a cpu physical address). This is not really specified 1102 * that way, but this is traditionally the way IBM at least do things 1103 */ 1104 static u64 __of_translate_address(void *blob, int node_offset, const fdt32_t *in_addr, 1105 const char *rprop) 1106 { 1107 int parent; 1108 struct of_bus *bus, *pbus; 1109 fdt32_t addr[OF_MAX_ADDR_CELLS]; 1110 int na, ns, pna, pns; 1111 u64 result = OF_BAD_ADDR; 1112 1113 debug("OF: ** translation for device %s **\n", 1114 fdt_get_name(blob, node_offset, NULL)); 1115 1116 /* Get parent & match bus type */ 1117 parent = fdt_parent_offset(blob, node_offset); 1118 if (parent < 0) 1119 goto bail; 1120 bus = &of_busses[0]; 1121 1122 /* Cound address cells & copy address locally */ 1123 bus->count_cells(blob, parent, &na, &ns); 1124 if (!OF_CHECK_COUNTS(na, ns)) { 1125 printf("%s: Bad cell count for %s\n", __FUNCTION__, 1126 fdt_get_name(blob, node_offset, NULL)); 1127 goto bail; 1128 } 1129 memcpy(addr, in_addr, na * 4); 1130 1131 debug("OF: bus is %s (na=%d, ns=%d) on %s\n", 1132 bus->name, na, ns, fdt_get_name(blob, parent, NULL)); 1133 of_dump_addr("OF: translating address:", addr, na); 1134 1135 /* Translate */ 1136 for (;;) { 1137 /* Switch to parent bus */ 1138 node_offset = parent; 1139 parent = fdt_parent_offset(blob, node_offset); 1140 1141 /* If root, we have finished */ 1142 if (parent < 0) { 1143 debug("OF: reached root node\n"); 1144 result = of_read_number(addr, na); 1145 break; 1146 } 1147 1148 /* Get new parent bus and counts */ 1149 pbus = &of_busses[0]; 1150 pbus->count_cells(blob, parent, &pna, &pns); 1151 if (!OF_CHECK_COUNTS(pna, pns)) { 1152 printf("%s: Bad cell count for %s\n", __FUNCTION__, 1153 fdt_get_name(blob, node_offset, NULL)); 1154 break; 1155 } 1156 1157 debug("OF: parent bus is %s (na=%d, ns=%d) on %s\n", 1158 pbus->name, pna, pns, fdt_get_name(blob, parent, NULL)); 1159 1160 /* Apply bus translation */ 1161 if (of_translate_one(blob, node_offset, bus, pbus, 1162 addr, na, ns, pna, rprop)) 1163 break; 1164 1165 /* Complete the move up one level */ 1166 na = pna; 1167 ns = pns; 1168 bus = pbus; 1169 1170 of_dump_addr("OF: one level translation:", addr, na); 1171 } 1172 bail: 1173 1174 return result; 1175 } 1176 1177 u64 fdt_translate_address(void *blob, int node_offset, const fdt32_t *in_addr) 1178 { 1179 return __of_translate_address(blob, node_offset, in_addr, "ranges"); 1180 } 1181 1182 /** 1183 * fdt_node_offset_by_compat_reg: Find a node that matches compatiable and 1184 * who's reg property matches a physical cpu address 1185 * 1186 * @blob: ptr to device tree 1187 * @compat: compatiable string to match 1188 * @compat_off: property name 1189 * 1190 */ 1191 int fdt_node_offset_by_compat_reg(void *blob, const char *compat, 1192 phys_addr_t compat_off) 1193 { 1194 int len, off = fdt_node_offset_by_compatible(blob, -1, compat); 1195 while (off != -FDT_ERR_NOTFOUND) { 1196 const fdt32_t *reg = fdt_getprop(blob, off, "reg", &len); 1197 if (reg) { 1198 if (compat_off == fdt_translate_address(blob, off, reg)) 1199 return off; 1200 } 1201 off = fdt_node_offset_by_compatible(blob, off, compat); 1202 } 1203 1204 return -FDT_ERR_NOTFOUND; 1205 } 1206 1207 /** 1208 * fdt_alloc_phandle: Return next free phandle value 1209 * 1210 * @blob: ptr to device tree 1211 */ 1212 int fdt_alloc_phandle(void *blob) 1213 { 1214 int offset, phandle = 0; 1215 1216 for (offset = fdt_next_node(blob, -1, NULL); offset >= 0; 1217 offset = fdt_next_node(blob, offset, NULL)) { 1218 phandle = max(phandle, fdt_get_phandle(blob, offset)); 1219 } 1220 1221 return phandle + 1; 1222 } 1223 1224 /* 1225 * fdt_set_phandle: Create a phandle property for the given node 1226 * 1227 * @fdt: ptr to device tree 1228 * @nodeoffset: node to update 1229 * @phandle: phandle value to set (must be unique) 1230 */ 1231 int fdt_set_phandle(void *fdt, int nodeoffset, uint32_t phandle) 1232 { 1233 int ret; 1234 1235 #ifdef DEBUG 1236 int off = fdt_node_offset_by_phandle(fdt, phandle); 1237 1238 if ((off >= 0) && (off != nodeoffset)) { 1239 char buf[64]; 1240 1241 fdt_get_path(fdt, nodeoffset, buf, sizeof(buf)); 1242 printf("Trying to update node %s with phandle %u ", 1243 buf, phandle); 1244 1245 fdt_get_path(fdt, off, buf, sizeof(buf)); 1246 printf("that already exists in node %s.\n", buf); 1247 return -FDT_ERR_BADPHANDLE; 1248 } 1249 #endif 1250 1251 ret = fdt_setprop_cell(fdt, nodeoffset, "phandle", phandle); 1252 if (ret < 0) 1253 return ret; 1254 1255 /* 1256 * For now, also set the deprecated "linux,phandle" property, so that we 1257 * don't break older kernels. 1258 */ 1259 ret = fdt_setprop_cell(fdt, nodeoffset, "linux,phandle", phandle); 1260 1261 return ret; 1262 } 1263 1264 /* 1265 * fdt_create_phandle: Create a phandle property for the given node 1266 * 1267 * @fdt: ptr to device tree 1268 * @nodeoffset: node to update 1269 */ 1270 unsigned int fdt_create_phandle(void *fdt, int nodeoffset) 1271 { 1272 /* see if there is a phandle already */ 1273 int phandle = fdt_get_phandle(fdt, nodeoffset); 1274 1275 /* if we got 0, means no phandle so create one */ 1276 if (phandle == 0) { 1277 int ret; 1278 1279 phandle = fdt_alloc_phandle(fdt); 1280 ret = fdt_set_phandle(fdt, nodeoffset, phandle); 1281 if (ret < 0) { 1282 printf("Can't set phandle %u: %s\n", phandle, 1283 fdt_strerror(ret)); 1284 return 0; 1285 } 1286 } 1287 1288 return phandle; 1289 } 1290 1291 /* 1292 * fdt_set_node_status: Set status for the given node 1293 * 1294 * @fdt: ptr to device tree 1295 * @nodeoffset: node to update 1296 * @status: FDT_STATUS_OKAY, FDT_STATUS_DISABLED, 1297 * FDT_STATUS_FAIL, FDT_STATUS_FAIL_ERROR_CODE 1298 * @error_code: optional, only used if status is FDT_STATUS_FAIL_ERROR_CODE 1299 */ 1300 int fdt_set_node_status(void *fdt, int nodeoffset, 1301 enum fdt_status status, unsigned int error_code) 1302 { 1303 char buf[16]; 1304 int ret = 0; 1305 1306 if (nodeoffset < 0) 1307 return nodeoffset; 1308 1309 switch (status) { 1310 case FDT_STATUS_OKAY: 1311 ret = fdt_setprop_string(fdt, nodeoffset, "status", "okay"); 1312 break; 1313 case FDT_STATUS_DISABLED: 1314 ret = fdt_setprop_string(fdt, nodeoffset, "status", "disabled"); 1315 break; 1316 case FDT_STATUS_FAIL: 1317 ret = fdt_setprop_string(fdt, nodeoffset, "status", "fail"); 1318 break; 1319 case FDT_STATUS_FAIL_ERROR_CODE: 1320 sprintf(buf, "fail-%d", error_code); 1321 ret = fdt_setprop_string(fdt, nodeoffset, "status", buf); 1322 break; 1323 default: 1324 printf("Invalid fdt status: %x\n", status); 1325 ret = -1; 1326 break; 1327 } 1328 1329 return ret; 1330 } 1331 1332 /* 1333 * fdt_set_status_by_alias: Set status for the given node given an alias 1334 * 1335 * @fdt: ptr to device tree 1336 * @alias: alias of node to update 1337 * @status: FDT_STATUS_OKAY, FDT_STATUS_DISABLED, 1338 * FDT_STATUS_FAIL, FDT_STATUS_FAIL_ERROR_CODE 1339 * @error_code: optional, only used if status is FDT_STATUS_FAIL_ERROR_CODE 1340 */ 1341 int fdt_set_status_by_alias(void *fdt, const char* alias, 1342 enum fdt_status status, unsigned int error_code) 1343 { 1344 int offset = fdt_path_offset(fdt, alias); 1345 1346 return fdt_set_node_status(fdt, offset, status, error_code); 1347 } 1348 1349 #if defined(CONFIG_VIDEO) || defined(CONFIG_LCD) 1350 int fdt_add_edid(void *blob, const char *compat, unsigned char *edid_buf) 1351 { 1352 int noff; 1353 int ret; 1354 1355 noff = fdt_node_offset_by_compatible(blob, -1, compat); 1356 if (noff != -FDT_ERR_NOTFOUND) { 1357 debug("%s: %s\n", fdt_get_name(blob, noff, 0), compat); 1358 add_edid: 1359 ret = fdt_setprop(blob, noff, "edid", edid_buf, 128); 1360 if (ret == -FDT_ERR_NOSPACE) { 1361 ret = fdt_increase_size(blob, 512); 1362 if (!ret) 1363 goto add_edid; 1364 else 1365 goto err_size; 1366 } else if (ret < 0) { 1367 printf("Can't add property: %s\n", fdt_strerror(ret)); 1368 return ret; 1369 } 1370 } 1371 return 0; 1372 err_size: 1373 printf("Can't increase blob size: %s\n", fdt_strerror(ret)); 1374 return ret; 1375 } 1376 #endif 1377 1378 /* 1379 * Verify the physical address of device tree node for a given alias 1380 * 1381 * This function locates the device tree node of a given alias, and then 1382 * verifies that the physical address of that device matches the given 1383 * parameter. It displays a message if there is a mismatch. 1384 * 1385 * Returns 1 on success, 0 on failure 1386 */ 1387 int fdt_verify_alias_address(void *fdt, int anode, const char *alias, u64 addr) 1388 { 1389 const char *path; 1390 const fdt32_t *reg; 1391 int node, len; 1392 u64 dt_addr; 1393 1394 path = fdt_getprop(fdt, anode, alias, NULL); 1395 if (!path) { 1396 /* If there's no such alias, then it's not a failure */ 1397 return 1; 1398 } 1399 1400 node = fdt_path_offset(fdt, path); 1401 if (node < 0) { 1402 printf("Warning: device tree alias '%s' points to invalid " 1403 "node %s.\n", alias, path); 1404 return 0; 1405 } 1406 1407 reg = fdt_getprop(fdt, node, "reg", &len); 1408 if (!reg) { 1409 printf("Warning: device tree node '%s' has no address.\n", 1410 path); 1411 return 0; 1412 } 1413 1414 dt_addr = fdt_translate_address(fdt, node, reg); 1415 if (addr != dt_addr) { 1416 printf("Warning: U-Boot configured device %s at address %llx,\n" 1417 " but the device tree has it address %llx.\n", 1418 alias, addr, dt_addr); 1419 return 0; 1420 } 1421 1422 return 1; 1423 } 1424 1425 /* 1426 * Returns the base address of an SOC or PCI node 1427 */ 1428 u64 fdt_get_base_address(void *fdt, int node) 1429 { 1430 int size; 1431 u32 naddr; 1432 const fdt32_t *prop; 1433 1434 prop = fdt_getprop(fdt, node, "#address-cells", &size); 1435 if (prop && size == 4) 1436 naddr = be32_to_cpup(prop); 1437 else 1438 naddr = 2; 1439 1440 prop = fdt_getprop(fdt, node, "ranges", &size); 1441 1442 return prop ? fdt_translate_address(fdt, node, prop + naddr) : 0; 1443 } 1444 1445 /* 1446 * Read a property of size <prop_len>. Currently only supports 1 or 2 cells. 1447 */ 1448 static int fdt_read_prop(const fdt32_t *prop, int prop_len, int cell_off, 1449 uint64_t *val, int cells) 1450 { 1451 const fdt32_t *prop32 = &prop[cell_off]; 1452 const fdt64_t *prop64 = (const fdt64_t *)&prop[cell_off]; 1453 1454 if ((cell_off + cells) > prop_len) 1455 return -FDT_ERR_NOSPACE; 1456 1457 switch (cells) { 1458 case 1: 1459 *val = fdt32_to_cpu(*prop32); 1460 break; 1461 case 2: 1462 *val = fdt64_to_cpu(*prop64); 1463 break; 1464 default: 1465 return -FDT_ERR_NOSPACE; 1466 } 1467 1468 return 0; 1469 } 1470 1471 /** 1472 * fdt_read_range - Read a node's n'th range property 1473 * 1474 * @fdt: ptr to device tree 1475 * @node: offset of node 1476 * @n: range index 1477 * @child_addr: pointer to storage for the "child address" field 1478 * @addr: pointer to storage for the CPU view translated physical start 1479 * @len: pointer to storage for the range length 1480 * 1481 * Convenience function that reads and interprets a specific range out of 1482 * a number of the "ranges" property array. 1483 */ 1484 int fdt_read_range(void *fdt, int node, int n, uint64_t *child_addr, 1485 uint64_t *addr, uint64_t *len) 1486 { 1487 int pnode = fdt_parent_offset(fdt, node); 1488 const fdt32_t *ranges; 1489 int pacells; 1490 int acells; 1491 int scells; 1492 int ranges_len; 1493 int cell = 0; 1494 int r = 0; 1495 1496 /* 1497 * The "ranges" property is an array of 1498 * { <child address> <parent address> <size in child address space> } 1499 * 1500 * All 3 elements can span a diffent number of cells. Fetch their size. 1501 */ 1502 pacells = fdt_getprop_u32_default_node(fdt, pnode, 0, "#address-cells", 1); 1503 acells = fdt_getprop_u32_default_node(fdt, node, 0, "#address-cells", 1); 1504 scells = fdt_getprop_u32_default_node(fdt, node, 0, "#size-cells", 1); 1505 1506 /* Now try to get the ranges property */ 1507 ranges = fdt_getprop(fdt, node, "ranges", &ranges_len); 1508 if (!ranges) 1509 return -FDT_ERR_NOTFOUND; 1510 ranges_len /= sizeof(uint32_t); 1511 1512 /* Jump to the n'th entry */ 1513 cell = n * (pacells + acells + scells); 1514 1515 /* Read <child address> */ 1516 if (child_addr) { 1517 r = fdt_read_prop(ranges, ranges_len, cell, child_addr, 1518 acells); 1519 if (r) 1520 return r; 1521 } 1522 cell += acells; 1523 1524 /* Read <parent address> */ 1525 if (addr) 1526 *addr = fdt_translate_address(fdt, node, ranges + cell); 1527 cell += pacells; 1528 1529 /* Read <size in child address space> */ 1530 if (len) { 1531 r = fdt_read_prop(ranges, ranges_len, cell, len, scells); 1532 if (r) 1533 return r; 1534 } 1535 1536 return 0; 1537 } 1538