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 * Global data (for the gd->bd) 21 */ 22 DECLARE_GLOBAL_DATA_PTR; 23 24 /* 25 * Get cells len in bytes 26 * if #NNNN-cells property is 2 then len is 8 27 * otherwise len is 4 28 */ 29 static int get_cells_len(void *blob, char *nr_cells_name) 30 { 31 const fdt32_t *cell; 32 33 cell = fdt_getprop(blob, 0, nr_cells_name, NULL); 34 if (cell && fdt32_to_cpu(*cell) == 2) 35 return 8; 36 37 return 4; 38 } 39 40 /* 41 * Write a 4 or 8 byte big endian cell 42 */ 43 static void write_cell(u8 *addr, u64 val, int size) 44 { 45 int shift = (size - 1) * 8; 46 while (size-- > 0) { 47 *addr++ = (val >> shift) & 0xff; 48 shift -= 8; 49 } 50 } 51 52 /** 53 * fdt_getprop_u32_default_node - Return a node's property or a default 54 * 55 * @fdt: ptr to device tree 56 * @off: offset of node 57 * @cell: cell offset in property 58 * @prop: property name 59 * @dflt: default value if the property isn't found 60 * 61 * Convenience function to return a node's property or a default value if 62 * the property doesn't exist. 63 */ 64 u32 fdt_getprop_u32_default_node(const void *fdt, int off, int cell, 65 const char *prop, const u32 dflt) 66 { 67 const fdt32_t *val; 68 int len; 69 70 val = fdt_getprop(fdt, off, prop, &len); 71 72 /* Check if property exists */ 73 if (!val) 74 return dflt; 75 76 /* Check if property is long enough */ 77 if (len < ((cell + 1) * sizeof(uint32_t))) 78 return dflt; 79 80 return fdt32_to_cpu(*val); 81 } 82 83 /** 84 * fdt_getprop_u32_default - Find a node and return it's property or a default 85 * 86 * @fdt: ptr to device tree 87 * @path: path of node 88 * @prop: property name 89 * @dflt: default value if the property isn't found 90 * 91 * Convenience function to find a node and return it's property or a 92 * default value if it doesn't exist. 93 */ 94 u32 fdt_getprop_u32_default(const void *fdt, const char *path, 95 const char *prop, const u32 dflt) 96 { 97 int off; 98 99 off = fdt_path_offset(fdt, path); 100 if (off < 0) 101 return dflt; 102 103 return fdt_getprop_u32_default_node(fdt, off, 0, prop, dflt); 104 } 105 106 /** 107 * fdt_find_and_setprop: Find a node and set it's property 108 * 109 * @fdt: ptr to device tree 110 * @node: path of node 111 * @prop: property name 112 * @val: ptr to new value 113 * @len: length of new property value 114 * @create: flag to create the property if it doesn't exist 115 * 116 * Convenience function to directly set a property given the path to the node. 117 */ 118 int fdt_find_and_setprop(void *fdt, const char *node, const char *prop, 119 const void *val, int len, int create) 120 { 121 int nodeoff = fdt_path_offset(fdt, node); 122 123 if (nodeoff < 0) 124 return nodeoff; 125 126 if ((!create) && (fdt_get_property(fdt, nodeoff, prop, NULL) == NULL)) 127 return 0; /* create flag not set; so exit quietly */ 128 129 return fdt_setprop(fdt, nodeoff, prop, val, len); 130 } 131 132 #ifdef CONFIG_OF_STDOUT_VIA_ALIAS 133 134 #ifdef CONFIG_CONS_INDEX 135 static void fdt_fill_multisername(char *sername, size_t maxlen) 136 { 137 const char *outname = stdio_devices[stdout]->name; 138 139 if (strcmp(outname, "serial") > 0) 140 strncpy(sername, outname, maxlen); 141 142 /* eserial? */ 143 if (strcmp(outname + 1, "serial") > 0) 144 strncpy(sername, outname + 1, maxlen); 145 } 146 #endif 147 148 static int fdt_fixup_stdout(void *fdt, int chosenoff) 149 { 150 int err = 0; 151 #ifdef CONFIG_CONS_INDEX 152 int node; 153 char sername[9] = { 0 }; 154 const char *path; 155 156 fdt_fill_multisername(sername, sizeof(sername) - 1); 157 if (!sername[0]) 158 sprintf(sername, "serial%d", CONFIG_CONS_INDEX - 1); 159 160 err = node = fdt_path_offset(fdt, "/aliases"); 161 if (node >= 0) { 162 int len; 163 path = fdt_getprop(fdt, node, sername, &len); 164 if (path) { 165 char *p = malloc(len); 166 err = -FDT_ERR_NOSPACE; 167 if (p) { 168 memcpy(p, path, len); 169 err = fdt_setprop(fdt, chosenoff, 170 "linux,stdout-path", p, len); 171 free(p); 172 } 173 } else { 174 err = len; 175 } 176 } 177 #endif 178 if (err < 0) 179 printf("WARNING: could not set linux,stdout-path %s.\n", 180 fdt_strerror(err)); 181 182 return err; 183 } 184 #endif 185 186 int fdt_initrd(void *fdt, ulong initrd_start, ulong initrd_end, int force) 187 { 188 int nodeoffset, addr_cell_len; 189 int err, j, total; 190 fdt64_t tmp; 191 const char *path; 192 uint64_t addr, size; 193 194 /* Find the "chosen" node. */ 195 nodeoffset = fdt_path_offset (fdt, "/chosen"); 196 197 /* If there is no "chosen" node in the blob return */ 198 if (nodeoffset < 0) { 199 printf("fdt_initrd: %s\n", fdt_strerror(nodeoffset)); 200 return nodeoffset; 201 } 202 203 /* just return if initrd_start/end aren't valid */ 204 if ((initrd_start == 0) || (initrd_end == 0)) 205 return 0; 206 207 total = fdt_num_mem_rsv(fdt); 208 209 /* 210 * Look for an existing entry and update it. If we don't find 211 * the entry, we will j be the next available slot. 212 */ 213 for (j = 0; j < total; j++) { 214 err = fdt_get_mem_rsv(fdt, j, &addr, &size); 215 if (addr == initrd_start) { 216 fdt_del_mem_rsv(fdt, j); 217 break; 218 } 219 } 220 221 err = fdt_add_mem_rsv(fdt, initrd_start, initrd_end - initrd_start); 222 if (err < 0) { 223 printf("fdt_initrd: %s\n", fdt_strerror(err)); 224 return err; 225 } 226 227 addr_cell_len = get_cells_len(fdt, "#address-cells"); 228 229 path = fdt_getprop(fdt, nodeoffset, "linux,initrd-start", NULL); 230 if ((path == NULL) || force) { 231 write_cell((u8 *)&tmp, initrd_start, addr_cell_len); 232 err = fdt_setprop(fdt, nodeoffset, 233 "linux,initrd-start", &tmp, addr_cell_len); 234 if (err < 0) { 235 printf("WARNING: " 236 "could not set linux,initrd-start %s.\n", 237 fdt_strerror(err)); 238 return err; 239 } 240 write_cell((u8 *)&tmp, initrd_end, addr_cell_len); 241 err = fdt_setprop(fdt, nodeoffset, 242 "linux,initrd-end", &tmp, addr_cell_len); 243 if (err < 0) { 244 printf("WARNING: could not set linux,initrd-end %s.\n", 245 fdt_strerror(err)); 246 247 return err; 248 } 249 } 250 251 return 0; 252 } 253 254 int fdt_chosen(void *fdt, int force) 255 { 256 int nodeoffset; 257 int err; 258 char *str; /* used to set string properties */ 259 const char *path; 260 261 err = fdt_check_header(fdt); 262 if (err < 0) { 263 printf("fdt_chosen: %s\n", fdt_strerror(err)); 264 return err; 265 } 266 267 /* 268 * Find the "chosen" node. 269 */ 270 nodeoffset = fdt_path_offset (fdt, "/chosen"); 271 272 /* 273 * If there is no "chosen" node in the blob, create it. 274 */ 275 if (nodeoffset < 0) { 276 /* 277 * Create a new node "/chosen" (offset 0 is root level) 278 */ 279 nodeoffset = fdt_add_subnode(fdt, 0, "chosen"); 280 if (nodeoffset < 0) { 281 printf("WARNING: could not create /chosen %s.\n", 282 fdt_strerror(nodeoffset)); 283 return nodeoffset; 284 } 285 } 286 287 /* 288 * Create /chosen properites that don't exist in the fdt. 289 * If the property exists, update it only if the "force" parameter 290 * is true. 291 */ 292 str = getenv("bootargs"); 293 if (str != NULL) { 294 path = fdt_getprop(fdt, nodeoffset, "bootargs", NULL); 295 if ((path == NULL) || force) { 296 err = fdt_setprop(fdt, nodeoffset, 297 "bootargs", str, strlen(str)+1); 298 if (err < 0) 299 printf("WARNING: could not set bootargs %s.\n", 300 fdt_strerror(err)); 301 } 302 } 303 304 #ifdef CONFIG_OF_STDOUT_VIA_ALIAS 305 path = fdt_getprop(fdt, nodeoffset, "linux,stdout-path", NULL); 306 if ((path == NULL) || force) 307 err = fdt_fixup_stdout(fdt, nodeoffset); 308 #endif 309 310 #ifdef OF_STDOUT_PATH 311 path = fdt_getprop(fdt, nodeoffset, "linux,stdout-path", NULL); 312 if ((path == NULL) || force) { 313 err = fdt_setprop(fdt, nodeoffset, 314 "linux,stdout-path", OF_STDOUT_PATH, strlen(OF_STDOUT_PATH)+1); 315 if (err < 0) 316 printf("WARNING: could not set linux,stdout-path %s.\n", 317 fdt_strerror(err)); 318 } 319 #endif 320 321 return err; 322 } 323 324 void do_fixup_by_path(void *fdt, const char *path, const char *prop, 325 const void *val, int len, int create) 326 { 327 #if defined(DEBUG) 328 int i; 329 debug("Updating property '%s/%s' = ", path, prop); 330 for (i = 0; i < len; i++) 331 debug(" %.2x", *(u8*)(val+i)); 332 debug("\n"); 333 #endif 334 int rc = fdt_find_and_setprop(fdt, path, prop, val, len, create); 335 if (rc) 336 printf("Unable to update property %s:%s, err=%s\n", 337 path, prop, fdt_strerror(rc)); 338 } 339 340 void do_fixup_by_path_u32(void *fdt, const char *path, const char *prop, 341 u32 val, int create) 342 { 343 fdt32_t tmp = cpu_to_fdt32(val); 344 do_fixup_by_path(fdt, path, prop, &tmp, sizeof(tmp), create); 345 } 346 347 void do_fixup_by_prop(void *fdt, 348 const char *pname, const void *pval, int plen, 349 const char *prop, const void *val, int len, 350 int create) 351 { 352 int off; 353 #if defined(DEBUG) 354 int i; 355 debug("Updating property '%s' = ", prop); 356 for (i = 0; i < len; i++) 357 debug(" %.2x", *(u8*)(val+i)); 358 debug("\n"); 359 #endif 360 off = fdt_node_offset_by_prop_value(fdt, -1, pname, pval, plen); 361 while (off != -FDT_ERR_NOTFOUND) { 362 if (create || (fdt_get_property(fdt, off, prop, NULL) != NULL)) 363 fdt_setprop(fdt, off, prop, val, len); 364 off = fdt_node_offset_by_prop_value(fdt, off, pname, pval, plen); 365 } 366 } 367 368 void do_fixup_by_prop_u32(void *fdt, 369 const char *pname, const void *pval, int plen, 370 const char *prop, u32 val, int create) 371 { 372 fdt32_t tmp = cpu_to_fdt32(val); 373 do_fixup_by_prop(fdt, pname, pval, plen, prop, &tmp, 4, create); 374 } 375 376 void do_fixup_by_compat(void *fdt, const char *compat, 377 const char *prop, const void *val, int len, int create) 378 { 379 int off = -1; 380 #if defined(DEBUG) 381 int i; 382 debug("Updating property '%s' = ", prop); 383 for (i = 0; i < len; i++) 384 debug(" %.2x", *(u8*)(val+i)); 385 debug("\n"); 386 #endif 387 off = fdt_node_offset_by_compatible(fdt, -1, compat); 388 while (off != -FDT_ERR_NOTFOUND) { 389 if (create || (fdt_get_property(fdt, off, prop, NULL) != NULL)) 390 fdt_setprop(fdt, off, prop, val, len); 391 off = fdt_node_offset_by_compatible(fdt, off, compat); 392 } 393 } 394 395 void do_fixup_by_compat_u32(void *fdt, const char *compat, 396 const char *prop, u32 val, int create) 397 { 398 fdt32_t tmp = cpu_to_fdt32(val); 399 do_fixup_by_compat(fdt, compat, prop, &tmp, 4, create); 400 } 401 402 #ifdef CONFIG_NR_DRAM_BANKS 403 #define MEMORY_BANKS_MAX CONFIG_NR_DRAM_BANKS 404 #else 405 #define MEMORY_BANKS_MAX 4 406 #endif 407 int fdt_fixup_memory_banks(void *blob, u64 start[], u64 size[], int banks) 408 { 409 int err, nodeoffset; 410 int addr_cell_len, size_cell_len, len; 411 u8 tmp[MEMORY_BANKS_MAX * 16]; /* Up to 64-bit address + 64-bit size */ 412 int bank; 413 414 if (banks > MEMORY_BANKS_MAX) { 415 printf("%s: num banks %d exceeds hardcoded limit %d." 416 " Recompile with higher MEMORY_BANKS_MAX?\n", 417 __FUNCTION__, banks, MEMORY_BANKS_MAX); 418 return -1; 419 } 420 421 err = fdt_check_header(blob); 422 if (err < 0) { 423 printf("%s: %s\n", __FUNCTION__, fdt_strerror(err)); 424 return err; 425 } 426 427 /* update, or add and update /memory node */ 428 nodeoffset = fdt_path_offset(blob, "/memory"); 429 if (nodeoffset < 0) { 430 nodeoffset = fdt_add_subnode(blob, 0, "memory"); 431 if (nodeoffset < 0) { 432 printf("WARNING: could not create /memory: %s.\n", 433 fdt_strerror(nodeoffset)); 434 return nodeoffset; 435 } 436 } 437 err = fdt_setprop(blob, nodeoffset, "device_type", "memory", 438 sizeof("memory")); 439 if (err < 0) { 440 printf("WARNING: could not set %s %s.\n", "device_type", 441 fdt_strerror(err)); 442 return err; 443 } 444 445 addr_cell_len = get_cells_len(blob, "#address-cells"); 446 size_cell_len = get_cells_len(blob, "#size-cells"); 447 448 for (bank = 0, len = 0; bank < banks; bank++) { 449 write_cell(tmp + len, start[bank], addr_cell_len); 450 len += addr_cell_len; 451 452 write_cell(tmp + len, size[bank], size_cell_len); 453 len += size_cell_len; 454 } 455 456 err = fdt_setprop(blob, nodeoffset, "reg", tmp, len); 457 if (err < 0) { 458 printf("WARNING: could not set %s %s.\n", 459 "reg", fdt_strerror(err)); 460 return err; 461 } 462 return 0; 463 } 464 465 int fdt_fixup_memory(void *blob, u64 start, u64 size) 466 { 467 return fdt_fixup_memory_banks(blob, &start, &size, 1); 468 } 469 470 void fdt_fixup_ethernet(void *fdt) 471 { 472 int node, i, j; 473 char enet[16], *tmp, *end; 474 char mac[16]; 475 const char *path; 476 unsigned char mac_addr[6]; 477 478 node = fdt_path_offset(fdt, "/aliases"); 479 if (node < 0) 480 return; 481 482 if (!getenv("ethaddr")) { 483 if (getenv("usbethaddr")) { 484 strcpy(mac, "usbethaddr"); 485 } else { 486 debug("No ethernet MAC Address defined\n"); 487 return; 488 } 489 } else { 490 strcpy(mac, "ethaddr"); 491 } 492 493 i = 0; 494 while ((tmp = getenv(mac)) != NULL) { 495 sprintf(enet, "ethernet%d", i); 496 path = fdt_getprop(fdt, node, enet, NULL); 497 if (!path) { 498 debug("No alias for %s\n", enet); 499 sprintf(mac, "eth%daddr", ++i); 500 continue; 501 } 502 503 for (j = 0; j < 6; j++) { 504 mac_addr[j] = tmp ? simple_strtoul(tmp, &end, 16) : 0; 505 if (tmp) 506 tmp = (*end) ? end+1 : end; 507 } 508 509 do_fixup_by_path(fdt, path, "mac-address", &mac_addr, 6, 0); 510 do_fixup_by_path(fdt, path, "local-mac-address", 511 &mac_addr, 6, 1); 512 513 sprintf(mac, "eth%daddr", ++i); 514 } 515 } 516 517 /* Resize the fdt to its actual size + a bit of padding */ 518 int fdt_resize(void *blob) 519 { 520 int i; 521 uint64_t addr, size; 522 int total, ret; 523 uint actualsize; 524 525 if (!blob) 526 return 0; 527 528 total = fdt_num_mem_rsv(blob); 529 for (i = 0; i < total; i++) { 530 fdt_get_mem_rsv(blob, i, &addr, &size); 531 if (addr == (uintptr_t)blob) { 532 fdt_del_mem_rsv(blob, i); 533 break; 534 } 535 } 536 537 /* 538 * Calculate the actual size of the fdt 539 * plus the size needed for 5 fdt_add_mem_rsv, one 540 * for the fdt itself and 4 for a possible initrd 541 * ((initrd-start + initrd-end) * 2 (name & value)) 542 */ 543 actualsize = fdt_off_dt_strings(blob) + 544 fdt_size_dt_strings(blob) + 5 * sizeof(struct fdt_reserve_entry); 545 546 /* Make it so the fdt ends on a page boundary */ 547 actualsize = ALIGN(actualsize + ((uintptr_t)blob & 0xfff), 0x1000); 548 actualsize = actualsize - ((uintptr_t)blob & 0xfff); 549 550 /* Change the fdt header to reflect the correct size */ 551 fdt_set_totalsize(blob, actualsize); 552 553 /* Add the new reservation */ 554 ret = fdt_add_mem_rsv(blob, (uintptr_t)blob, actualsize); 555 if (ret < 0) 556 return ret; 557 558 return actualsize; 559 } 560 561 #ifdef CONFIG_PCI 562 #define CONFIG_SYS_PCI_NR_INBOUND_WIN 4 563 564 #define FDT_PCI_PREFETCH (0x40000000) 565 #define FDT_PCI_MEM32 (0x02000000) 566 #define FDT_PCI_IO (0x01000000) 567 #define FDT_PCI_MEM64 (0x03000000) 568 569 int fdt_pci_dma_ranges(void *blob, int phb_off, struct pci_controller *hose) { 570 571 int addrcell, sizecell, len, r; 572 u32 *dma_range; 573 /* sized based on pci addr cells, size-cells, & address-cells */ 574 u32 dma_ranges[(3 + 2 + 2) * CONFIG_SYS_PCI_NR_INBOUND_WIN]; 575 576 addrcell = fdt_getprop_u32_default(blob, "/", "#address-cells", 1); 577 sizecell = fdt_getprop_u32_default(blob, "/", "#size-cells", 1); 578 579 dma_range = &dma_ranges[0]; 580 for (r = 0; r < hose->region_count; r++) { 581 u64 bus_start, phys_start, size; 582 583 /* skip if !PCI_REGION_SYS_MEMORY */ 584 if (!(hose->regions[r].flags & PCI_REGION_SYS_MEMORY)) 585 continue; 586 587 bus_start = (u64)hose->regions[r].bus_start; 588 phys_start = (u64)hose->regions[r].phys_start; 589 size = (u64)hose->regions[r].size; 590 591 dma_range[0] = 0; 592 if (size >= 0x100000000ull) 593 dma_range[0] |= FDT_PCI_MEM64; 594 else 595 dma_range[0] |= FDT_PCI_MEM32; 596 if (hose->regions[r].flags & PCI_REGION_PREFETCH) 597 dma_range[0] |= FDT_PCI_PREFETCH; 598 #ifdef CONFIG_SYS_PCI_64BIT 599 dma_range[1] = bus_start >> 32; 600 #else 601 dma_range[1] = 0; 602 #endif 603 dma_range[2] = bus_start & 0xffffffff; 604 605 if (addrcell == 2) { 606 dma_range[3] = phys_start >> 32; 607 dma_range[4] = phys_start & 0xffffffff; 608 } else { 609 dma_range[3] = phys_start & 0xffffffff; 610 } 611 612 if (sizecell == 2) { 613 dma_range[3 + addrcell + 0] = size >> 32; 614 dma_range[3 + addrcell + 1] = size & 0xffffffff; 615 } else { 616 dma_range[3 + addrcell + 0] = size & 0xffffffff; 617 } 618 619 dma_range += (3 + addrcell + sizecell); 620 } 621 622 len = dma_range - &dma_ranges[0]; 623 if (len) 624 fdt_setprop(blob, phb_off, "dma-ranges", &dma_ranges[0], len*4); 625 626 return 0; 627 } 628 #endif 629 630 #ifdef CONFIG_FDT_FIXUP_NOR_FLASH_SIZE 631 /* 632 * Provide a weak default function to return the flash bank size. 633 * There might be multiple non-identical flash chips connected to one 634 * chip-select, so we need to pass an index as well. 635 */ 636 u32 __flash_get_bank_size(int cs, int idx) 637 { 638 extern flash_info_t flash_info[]; 639 640 /* 641 * As default, a simple 1:1 mapping is provided. Boards with 642 * a different mapping need to supply a board specific mapping 643 * routine. 644 */ 645 return flash_info[cs].size; 646 } 647 u32 flash_get_bank_size(int cs, int idx) 648 __attribute__((weak, alias("__flash_get_bank_size"))); 649 650 /* 651 * This function can be used to update the size in the "reg" property 652 * of all NOR FLASH device nodes. This is necessary for boards with 653 * non-fixed NOR FLASH sizes. 654 */ 655 int fdt_fixup_nor_flash_size(void *blob) 656 { 657 char compat[][16] = { "cfi-flash", "jedec-flash" }; 658 int off; 659 int len; 660 struct fdt_property *prop; 661 u32 *reg, *reg2; 662 int i; 663 664 for (i = 0; i < 2; i++) { 665 off = fdt_node_offset_by_compatible(blob, -1, compat[i]); 666 while (off != -FDT_ERR_NOTFOUND) { 667 int idx; 668 669 /* 670 * Found one compatible node, so fixup the size 671 * int its reg properties 672 */ 673 prop = fdt_get_property_w(blob, off, "reg", &len); 674 if (prop) { 675 int tuple_size = 3 * sizeof(reg); 676 677 /* 678 * There might be multiple reg-tuples, 679 * so loop through them all 680 */ 681 reg = reg2 = (u32 *)&prop->data[0]; 682 for (idx = 0; idx < (len / tuple_size); idx++) { 683 /* 684 * Update size in reg property 685 */ 686 reg[2] = flash_get_bank_size(reg[0], 687 idx); 688 689 /* 690 * Point to next reg tuple 691 */ 692 reg += 3; 693 } 694 695 fdt_setprop(blob, off, "reg", reg2, len); 696 } 697 698 /* Move to next compatible node */ 699 off = fdt_node_offset_by_compatible(blob, off, 700 compat[i]); 701 } 702 } 703 704 return 0; 705 } 706 #endif 707 708 int fdt_increase_size(void *fdt, int add_len) 709 { 710 int newlen; 711 712 newlen = fdt_totalsize(fdt) + add_len; 713 714 /* Open in place with a new len */ 715 return fdt_open_into(fdt, fdt, newlen); 716 } 717 718 #ifdef CONFIG_FDT_FIXUP_PARTITIONS 719 #include <jffs2/load_kernel.h> 720 #include <mtd_node.h> 721 722 struct reg_cell { 723 unsigned int r0; 724 unsigned int r1; 725 }; 726 727 int fdt_del_subnodes(const void *blob, int parent_offset) 728 { 729 int off, ndepth; 730 int ret; 731 732 for (ndepth = 0, off = fdt_next_node(blob, parent_offset, &ndepth); 733 (off >= 0) && (ndepth > 0); 734 off = fdt_next_node(blob, off, &ndepth)) { 735 if (ndepth == 1) { 736 debug("delete %s: offset: %x\n", 737 fdt_get_name(blob, off, 0), off); 738 ret = fdt_del_node((void *)blob, off); 739 if (ret < 0) { 740 printf("Can't delete node: %s\n", 741 fdt_strerror(ret)); 742 return ret; 743 } else { 744 ndepth = 0; 745 off = parent_offset; 746 } 747 } 748 } 749 return 0; 750 } 751 752 int fdt_del_partitions(void *blob, int parent_offset) 753 { 754 const void *prop; 755 int ndepth = 0; 756 int off; 757 int ret; 758 759 off = fdt_next_node(blob, parent_offset, &ndepth); 760 if (off > 0 && ndepth == 1) { 761 prop = fdt_getprop(blob, off, "label", NULL); 762 if (prop == NULL) { 763 /* 764 * Could not find label property, nand {}; node? 765 * Check subnode, delete partitions there if any. 766 */ 767 return fdt_del_partitions(blob, off); 768 } else { 769 ret = fdt_del_subnodes(blob, parent_offset); 770 if (ret < 0) { 771 printf("Can't remove subnodes: %s\n", 772 fdt_strerror(ret)); 773 return ret; 774 } 775 } 776 } 777 return 0; 778 } 779 780 int fdt_node_set_part_info(void *blob, int parent_offset, 781 struct mtd_device *dev) 782 { 783 struct list_head *pentry; 784 struct part_info *part; 785 struct reg_cell cell; 786 int off, ndepth = 0; 787 int part_num, ret; 788 char buf[64]; 789 790 ret = fdt_del_partitions(blob, parent_offset); 791 if (ret < 0) 792 return ret; 793 794 /* 795 * Check if it is nand {}; subnode, adjust 796 * the offset in this case 797 */ 798 off = fdt_next_node(blob, parent_offset, &ndepth); 799 if (off > 0 && ndepth == 1) 800 parent_offset = off; 801 802 part_num = 0; 803 list_for_each_prev(pentry, &dev->parts) { 804 int newoff; 805 806 part = list_entry(pentry, struct part_info, link); 807 808 debug("%2d: %-20s0x%08llx\t0x%08llx\t%d\n", 809 part_num, part->name, part->size, 810 part->offset, part->mask_flags); 811 812 sprintf(buf, "partition@%llx", part->offset); 813 add_sub: 814 ret = fdt_add_subnode(blob, parent_offset, buf); 815 if (ret == -FDT_ERR_NOSPACE) { 816 ret = fdt_increase_size(blob, 512); 817 if (!ret) 818 goto add_sub; 819 else 820 goto err_size; 821 } else if (ret < 0) { 822 printf("Can't add partition node: %s\n", 823 fdt_strerror(ret)); 824 return ret; 825 } 826 newoff = ret; 827 828 /* Check MTD_WRITEABLE_CMD flag */ 829 if (part->mask_flags & 1) { 830 add_ro: 831 ret = fdt_setprop(blob, newoff, "read_only", NULL, 0); 832 if (ret == -FDT_ERR_NOSPACE) { 833 ret = fdt_increase_size(blob, 512); 834 if (!ret) 835 goto add_ro; 836 else 837 goto err_size; 838 } else if (ret < 0) 839 goto err_prop; 840 } 841 842 cell.r0 = cpu_to_fdt32(part->offset); 843 cell.r1 = cpu_to_fdt32(part->size); 844 add_reg: 845 ret = fdt_setprop(blob, newoff, "reg", &cell, sizeof(cell)); 846 if (ret == -FDT_ERR_NOSPACE) { 847 ret = fdt_increase_size(blob, 512); 848 if (!ret) 849 goto add_reg; 850 else 851 goto err_size; 852 } else if (ret < 0) 853 goto err_prop; 854 855 add_label: 856 ret = fdt_setprop_string(blob, newoff, "label", part->name); 857 if (ret == -FDT_ERR_NOSPACE) { 858 ret = fdt_increase_size(blob, 512); 859 if (!ret) 860 goto add_label; 861 else 862 goto err_size; 863 } else if (ret < 0) 864 goto err_prop; 865 866 part_num++; 867 } 868 return 0; 869 err_size: 870 printf("Can't increase blob size: %s\n", fdt_strerror(ret)); 871 return ret; 872 err_prop: 873 printf("Can't add property: %s\n", fdt_strerror(ret)); 874 return ret; 875 } 876 877 /* 878 * Update partitions in nor/nand nodes using info from 879 * mtdparts environment variable. The nodes to update are 880 * specified by node_info structure which contains mtd device 881 * type and compatible string: E. g. the board code in 882 * ft_board_setup() could use: 883 * 884 * struct node_info nodes[] = { 885 * { "fsl,mpc5121-nfc", MTD_DEV_TYPE_NAND, }, 886 * { "cfi-flash", MTD_DEV_TYPE_NOR, }, 887 * }; 888 * 889 * fdt_fixup_mtdparts(blob, nodes, ARRAY_SIZE(nodes)); 890 */ 891 void fdt_fixup_mtdparts(void *blob, void *node_info, int node_info_size) 892 { 893 struct node_info *ni = node_info; 894 struct mtd_device *dev; 895 char *parts; 896 int i, idx; 897 int noff; 898 899 parts = getenv("mtdparts"); 900 if (!parts) 901 return; 902 903 if (mtdparts_init() != 0) 904 return; 905 906 for (i = 0; i < node_info_size; i++) { 907 idx = 0; 908 noff = fdt_node_offset_by_compatible(blob, -1, ni[i].compat); 909 while (noff != -FDT_ERR_NOTFOUND) { 910 debug("%s: %s, mtd dev type %d\n", 911 fdt_get_name(blob, noff, 0), 912 ni[i].compat, ni[i].type); 913 dev = device_find(ni[i].type, idx++); 914 if (dev) { 915 if (fdt_node_set_part_info(blob, noff, dev)) 916 return; /* return on error */ 917 } 918 919 /* Jump to next flash node */ 920 noff = fdt_node_offset_by_compatible(blob, noff, 921 ni[i].compat); 922 } 923 } 924 } 925 #endif 926 927 void fdt_del_node_and_alias(void *blob, const char *alias) 928 { 929 int off = fdt_path_offset(blob, alias); 930 931 if (off < 0) 932 return; 933 934 fdt_del_node(blob, off); 935 936 off = fdt_path_offset(blob, "/aliases"); 937 fdt_delprop(blob, off, alias); 938 } 939 940 /* Helper to read a big number; size is in cells (not bytes) */ 941 static inline u64 of_read_number(const fdt32_t *cell, int size) 942 { 943 u64 r = 0; 944 while (size--) 945 r = (r << 32) | fdt32_to_cpu(*(cell++)); 946 return r; 947 } 948 949 #define PRu64 "%llx" 950 951 /* Max address size we deal with */ 952 #define OF_MAX_ADDR_CELLS 4 953 #define OF_BAD_ADDR ((u64)-1) 954 #define OF_CHECK_COUNTS(na, ns) ((na) > 0 && (na) <= OF_MAX_ADDR_CELLS && \ 955 (ns) > 0) 956 957 /* Debug utility */ 958 #ifdef DEBUG 959 static void of_dump_addr(const char *s, const fdt32_t *addr, int na) 960 { 961 printf("%s", s); 962 while(na--) 963 printf(" %08x", *(addr++)); 964 printf("\n"); 965 } 966 #else 967 static void of_dump_addr(const char *s, const fdt32_t *addr, int na) { } 968 #endif 969 970 /* Callbacks for bus specific translators */ 971 struct of_bus { 972 const char *name; 973 const char *addresses; 974 void (*count_cells)(void *blob, int parentoffset, 975 int *addrc, int *sizec); 976 u64 (*map)(fdt32_t *addr, const fdt32_t *range, 977 int na, int ns, int pna); 978 int (*translate)(fdt32_t *addr, u64 offset, int na); 979 }; 980 981 /* Default translator (generic bus) */ 982 static void of_bus_default_count_cells(void *blob, int parentoffset, 983 int *addrc, int *sizec) 984 { 985 const fdt32_t *prop; 986 987 if (addrc) { 988 prop = fdt_getprop(blob, parentoffset, "#address-cells", NULL); 989 if (prop) 990 *addrc = be32_to_cpup(prop); 991 else 992 *addrc = 2; 993 } 994 995 if (sizec) { 996 prop = fdt_getprop(blob, parentoffset, "#size-cells", NULL); 997 if (prop) 998 *sizec = be32_to_cpup(prop); 999 else 1000 *sizec = 1; 1001 } 1002 } 1003 1004 static u64 of_bus_default_map(fdt32_t *addr, const fdt32_t *range, 1005 int na, int ns, int pna) 1006 { 1007 u64 cp, s, da; 1008 1009 cp = of_read_number(range, na); 1010 s = of_read_number(range + na + pna, ns); 1011 da = of_read_number(addr, na); 1012 1013 debug("OF: default map, cp="PRu64", s="PRu64", da="PRu64"\n", 1014 cp, s, da); 1015 1016 if (da < cp || da >= (cp + s)) 1017 return OF_BAD_ADDR; 1018 return da - cp; 1019 } 1020 1021 static int of_bus_default_translate(fdt32_t *addr, u64 offset, int na) 1022 { 1023 u64 a = of_read_number(addr, na); 1024 memset(addr, 0, na * 4); 1025 a += offset; 1026 if (na > 1) 1027 addr[na - 2] = cpu_to_fdt32(a >> 32); 1028 addr[na - 1] = cpu_to_fdt32(a & 0xffffffffu); 1029 1030 return 0; 1031 } 1032 1033 /* Array of bus specific translators */ 1034 static struct of_bus of_busses[] = { 1035 /* Default */ 1036 { 1037 .name = "default", 1038 .addresses = "reg", 1039 .count_cells = of_bus_default_count_cells, 1040 .map = of_bus_default_map, 1041 .translate = of_bus_default_translate, 1042 }, 1043 }; 1044 1045 static int of_translate_one(void * blob, int parent, struct of_bus *bus, 1046 struct of_bus *pbus, fdt32_t *addr, 1047 int na, int ns, int pna, const char *rprop) 1048 { 1049 const fdt32_t *ranges; 1050 int rlen; 1051 int rone; 1052 u64 offset = OF_BAD_ADDR; 1053 1054 /* Normally, an absence of a "ranges" property means we are 1055 * crossing a non-translatable boundary, and thus the addresses 1056 * below the current not cannot be converted to CPU physical ones. 1057 * Unfortunately, while this is very clear in the spec, it's not 1058 * what Apple understood, and they do have things like /uni-n or 1059 * /ht nodes with no "ranges" property and a lot of perfectly 1060 * useable mapped devices below them. Thus we treat the absence of 1061 * "ranges" as equivalent to an empty "ranges" property which means 1062 * a 1:1 translation at that level. It's up to the caller not to try 1063 * to translate addresses that aren't supposed to be translated in 1064 * the first place. --BenH. 1065 */ 1066 ranges = fdt_getprop(blob, parent, rprop, &rlen); 1067 if (ranges == NULL || rlen == 0) { 1068 offset = of_read_number(addr, na); 1069 memset(addr, 0, pna * 4); 1070 debug("OF: no ranges, 1:1 translation\n"); 1071 goto finish; 1072 } 1073 1074 debug("OF: walking ranges...\n"); 1075 1076 /* Now walk through the ranges */ 1077 rlen /= 4; 1078 rone = na + pna + ns; 1079 for (; rlen >= rone; rlen -= rone, ranges += rone) { 1080 offset = bus->map(addr, ranges, na, ns, pna); 1081 if (offset != OF_BAD_ADDR) 1082 break; 1083 } 1084 if (offset == OF_BAD_ADDR) { 1085 debug("OF: not found !\n"); 1086 return 1; 1087 } 1088 memcpy(addr, ranges + na, 4 * pna); 1089 1090 finish: 1091 of_dump_addr("OF: parent translation for:", addr, pna); 1092 debug("OF: with offset: "PRu64"\n", offset); 1093 1094 /* Translate it into parent bus space */ 1095 return pbus->translate(addr, offset, pna); 1096 } 1097 1098 /* 1099 * Translate an address from the device-tree into a CPU physical address, 1100 * this walks up the tree and applies the various bus mappings on the 1101 * way. 1102 * 1103 * Note: We consider that crossing any level with #size-cells == 0 to mean 1104 * that translation is impossible (that is we are not dealing with a value 1105 * that can be mapped to a cpu physical address). This is not really specified 1106 * that way, but this is traditionally the way IBM at least do things 1107 */ 1108 static u64 __of_translate_address(void *blob, int node_offset, const fdt32_t *in_addr, 1109 const char *rprop) 1110 { 1111 int parent; 1112 struct of_bus *bus, *pbus; 1113 fdt32_t addr[OF_MAX_ADDR_CELLS]; 1114 int na, ns, pna, pns; 1115 u64 result = OF_BAD_ADDR; 1116 1117 debug("OF: ** translation for device %s **\n", 1118 fdt_get_name(blob, node_offset, NULL)); 1119 1120 /* Get parent & match bus type */ 1121 parent = fdt_parent_offset(blob, node_offset); 1122 if (parent < 0) 1123 goto bail; 1124 bus = &of_busses[0]; 1125 1126 /* Cound address cells & copy address locally */ 1127 bus->count_cells(blob, parent, &na, &ns); 1128 if (!OF_CHECK_COUNTS(na, ns)) { 1129 printf("%s: Bad cell count for %s\n", __FUNCTION__, 1130 fdt_get_name(blob, node_offset, NULL)); 1131 goto bail; 1132 } 1133 memcpy(addr, in_addr, na * 4); 1134 1135 debug("OF: bus is %s (na=%d, ns=%d) on %s\n", 1136 bus->name, na, ns, fdt_get_name(blob, parent, NULL)); 1137 of_dump_addr("OF: translating address:", addr, na); 1138 1139 /* Translate */ 1140 for (;;) { 1141 /* Switch to parent bus */ 1142 node_offset = parent; 1143 parent = fdt_parent_offset(blob, node_offset); 1144 1145 /* If root, we have finished */ 1146 if (parent < 0) { 1147 debug("OF: reached root node\n"); 1148 result = of_read_number(addr, na); 1149 break; 1150 } 1151 1152 /* Get new parent bus and counts */ 1153 pbus = &of_busses[0]; 1154 pbus->count_cells(blob, parent, &pna, &pns); 1155 if (!OF_CHECK_COUNTS(pna, pns)) { 1156 printf("%s: Bad cell count for %s\n", __FUNCTION__, 1157 fdt_get_name(blob, node_offset, NULL)); 1158 break; 1159 } 1160 1161 debug("OF: parent bus is %s (na=%d, ns=%d) on %s\n", 1162 pbus->name, pna, pns, fdt_get_name(blob, parent, NULL)); 1163 1164 /* Apply bus translation */ 1165 if (of_translate_one(blob, node_offset, bus, pbus, 1166 addr, na, ns, pna, rprop)) 1167 break; 1168 1169 /* Complete the move up one level */ 1170 na = pna; 1171 ns = pns; 1172 bus = pbus; 1173 1174 of_dump_addr("OF: one level translation:", addr, na); 1175 } 1176 bail: 1177 1178 return result; 1179 } 1180 1181 u64 fdt_translate_address(void *blob, int node_offset, const fdt32_t *in_addr) 1182 { 1183 return __of_translate_address(blob, node_offset, in_addr, "ranges"); 1184 } 1185 1186 /** 1187 * fdt_node_offset_by_compat_reg: Find a node that matches compatiable and 1188 * who's reg property matches a physical cpu address 1189 * 1190 * @blob: ptr to device tree 1191 * @compat: compatiable string to match 1192 * @compat_off: property name 1193 * 1194 */ 1195 int fdt_node_offset_by_compat_reg(void *blob, const char *compat, 1196 phys_addr_t compat_off) 1197 { 1198 int len, off = fdt_node_offset_by_compatible(blob, -1, compat); 1199 while (off != -FDT_ERR_NOTFOUND) { 1200 const fdt32_t *reg = fdt_getprop(blob, off, "reg", &len); 1201 if (reg) { 1202 if (compat_off == fdt_translate_address(blob, off, reg)) 1203 return off; 1204 } 1205 off = fdt_node_offset_by_compatible(blob, off, compat); 1206 } 1207 1208 return -FDT_ERR_NOTFOUND; 1209 } 1210 1211 /** 1212 * fdt_alloc_phandle: Return next free phandle value 1213 * 1214 * @blob: ptr to device tree 1215 */ 1216 int fdt_alloc_phandle(void *blob) 1217 { 1218 int offset, phandle = 0; 1219 1220 for (offset = fdt_next_node(blob, -1, NULL); offset >= 0; 1221 offset = fdt_next_node(blob, offset, NULL)) { 1222 phandle = max(phandle, fdt_get_phandle(blob, offset)); 1223 } 1224 1225 return phandle + 1; 1226 } 1227 1228 /* 1229 * fdt_set_phandle: Create a phandle property for the given node 1230 * 1231 * @fdt: ptr to device tree 1232 * @nodeoffset: node to update 1233 * @phandle: phandle value to set (must be unique) 1234 */ 1235 int fdt_set_phandle(void *fdt, int nodeoffset, uint32_t phandle) 1236 { 1237 int ret; 1238 1239 #ifdef DEBUG 1240 int off = fdt_node_offset_by_phandle(fdt, phandle); 1241 1242 if ((off >= 0) && (off != nodeoffset)) { 1243 char buf[64]; 1244 1245 fdt_get_path(fdt, nodeoffset, buf, sizeof(buf)); 1246 printf("Trying to update node %s with phandle %u ", 1247 buf, phandle); 1248 1249 fdt_get_path(fdt, off, buf, sizeof(buf)); 1250 printf("that already exists in node %s.\n", buf); 1251 return -FDT_ERR_BADPHANDLE; 1252 } 1253 #endif 1254 1255 ret = fdt_setprop_cell(fdt, nodeoffset, "phandle", phandle); 1256 if (ret < 0) 1257 return ret; 1258 1259 /* 1260 * For now, also set the deprecated "linux,phandle" property, so that we 1261 * don't break older kernels. 1262 */ 1263 ret = fdt_setprop_cell(fdt, nodeoffset, "linux,phandle", phandle); 1264 1265 return ret; 1266 } 1267 1268 /* 1269 * fdt_create_phandle: Create a phandle property for the given node 1270 * 1271 * @fdt: ptr to device tree 1272 * @nodeoffset: node to update 1273 */ 1274 unsigned int fdt_create_phandle(void *fdt, int nodeoffset) 1275 { 1276 /* see if there is a phandle already */ 1277 int phandle = fdt_get_phandle(fdt, nodeoffset); 1278 1279 /* if we got 0, means no phandle so create one */ 1280 if (phandle == 0) { 1281 int ret; 1282 1283 phandle = fdt_alloc_phandle(fdt); 1284 ret = fdt_set_phandle(fdt, nodeoffset, phandle); 1285 if (ret < 0) { 1286 printf("Can't set phandle %u: %s\n", phandle, 1287 fdt_strerror(ret)); 1288 return 0; 1289 } 1290 } 1291 1292 return phandle; 1293 } 1294 1295 /* 1296 * fdt_set_node_status: Set status for the given node 1297 * 1298 * @fdt: ptr to device tree 1299 * @nodeoffset: node to update 1300 * @status: FDT_STATUS_OKAY, FDT_STATUS_DISABLED, 1301 * FDT_STATUS_FAIL, FDT_STATUS_FAIL_ERROR_CODE 1302 * @error_code: optional, only used if status is FDT_STATUS_FAIL_ERROR_CODE 1303 */ 1304 int fdt_set_node_status(void *fdt, int nodeoffset, 1305 enum fdt_status status, unsigned int error_code) 1306 { 1307 char buf[16]; 1308 int ret = 0; 1309 1310 if (nodeoffset < 0) 1311 return nodeoffset; 1312 1313 switch (status) { 1314 case FDT_STATUS_OKAY: 1315 ret = fdt_setprop_string(fdt, nodeoffset, "status", "okay"); 1316 break; 1317 case FDT_STATUS_DISABLED: 1318 ret = fdt_setprop_string(fdt, nodeoffset, "status", "disabled"); 1319 break; 1320 case FDT_STATUS_FAIL: 1321 ret = fdt_setprop_string(fdt, nodeoffset, "status", "fail"); 1322 break; 1323 case FDT_STATUS_FAIL_ERROR_CODE: 1324 sprintf(buf, "fail-%d", error_code); 1325 ret = fdt_setprop_string(fdt, nodeoffset, "status", buf); 1326 break; 1327 default: 1328 printf("Invalid fdt status: %x\n", status); 1329 ret = -1; 1330 break; 1331 } 1332 1333 return ret; 1334 } 1335 1336 /* 1337 * fdt_set_status_by_alias: Set status for the given node given an alias 1338 * 1339 * @fdt: ptr to device tree 1340 * @alias: alias of node to update 1341 * @status: FDT_STATUS_OKAY, FDT_STATUS_DISABLED, 1342 * FDT_STATUS_FAIL, FDT_STATUS_FAIL_ERROR_CODE 1343 * @error_code: optional, only used if status is FDT_STATUS_FAIL_ERROR_CODE 1344 */ 1345 int fdt_set_status_by_alias(void *fdt, const char* alias, 1346 enum fdt_status status, unsigned int error_code) 1347 { 1348 int offset = fdt_path_offset(fdt, alias); 1349 1350 return fdt_set_node_status(fdt, offset, status, error_code); 1351 } 1352 1353 #if defined(CONFIG_VIDEO) || defined(CONFIG_LCD) 1354 int fdt_add_edid(void *blob, const char *compat, unsigned char *edid_buf) 1355 { 1356 int noff; 1357 int ret; 1358 1359 noff = fdt_node_offset_by_compatible(blob, -1, compat); 1360 if (noff != -FDT_ERR_NOTFOUND) { 1361 debug("%s: %s\n", fdt_get_name(blob, noff, 0), compat); 1362 add_edid: 1363 ret = fdt_setprop(blob, noff, "edid", edid_buf, 128); 1364 if (ret == -FDT_ERR_NOSPACE) { 1365 ret = fdt_increase_size(blob, 512); 1366 if (!ret) 1367 goto add_edid; 1368 else 1369 goto err_size; 1370 } else if (ret < 0) { 1371 printf("Can't add property: %s\n", fdt_strerror(ret)); 1372 return ret; 1373 } 1374 } 1375 return 0; 1376 err_size: 1377 printf("Can't increase blob size: %s\n", fdt_strerror(ret)); 1378 return ret; 1379 } 1380 #endif 1381 1382 /* 1383 * Verify the physical address of device tree node for a given alias 1384 * 1385 * This function locates the device tree node of a given alias, and then 1386 * verifies that the physical address of that device matches the given 1387 * parameter. It displays a message if there is a mismatch. 1388 * 1389 * Returns 1 on success, 0 on failure 1390 */ 1391 int fdt_verify_alias_address(void *fdt, int anode, const char *alias, u64 addr) 1392 { 1393 const char *path; 1394 const fdt32_t *reg; 1395 int node, len; 1396 u64 dt_addr; 1397 1398 path = fdt_getprop(fdt, anode, alias, NULL); 1399 if (!path) { 1400 /* If there's no such alias, then it's not a failure */ 1401 return 1; 1402 } 1403 1404 node = fdt_path_offset(fdt, path); 1405 if (node < 0) { 1406 printf("Warning: device tree alias '%s' points to invalid " 1407 "node %s.\n", alias, path); 1408 return 0; 1409 } 1410 1411 reg = fdt_getprop(fdt, node, "reg", &len); 1412 if (!reg) { 1413 printf("Warning: device tree node '%s' has no address.\n", 1414 path); 1415 return 0; 1416 } 1417 1418 dt_addr = fdt_translate_address(fdt, node, reg); 1419 if (addr != dt_addr) { 1420 printf("Warning: U-Boot configured device %s at address %llx,\n" 1421 " but the device tree has it address %llx.\n", 1422 alias, addr, dt_addr); 1423 return 0; 1424 } 1425 1426 return 1; 1427 } 1428 1429 /* 1430 * Returns the base address of an SOC or PCI node 1431 */ 1432 u64 fdt_get_base_address(void *fdt, int node) 1433 { 1434 int size; 1435 u32 naddr; 1436 const fdt32_t *prop; 1437 1438 prop = fdt_getprop(fdt, node, "#address-cells", &size); 1439 if (prop && size == 4) 1440 naddr = be32_to_cpup(prop); 1441 else 1442 naddr = 2; 1443 1444 prop = fdt_getprop(fdt, node, "ranges", &size); 1445 1446 return prop ? fdt_translate_address(fdt, node, prop + naddr) : 0; 1447 } 1448 1449 /* 1450 * Read a property of size <prop_len>. Currently only supports 1 or 2 cells. 1451 */ 1452 static int fdt_read_prop(const fdt32_t *prop, int prop_len, int cell_off, 1453 uint64_t *val, int cells) 1454 { 1455 const fdt32_t *prop32 = &prop[cell_off]; 1456 const fdt64_t *prop64 = (const fdt64_t *)&prop[cell_off]; 1457 1458 if ((cell_off + cells) > prop_len) 1459 return -FDT_ERR_NOSPACE; 1460 1461 switch (cells) { 1462 case 1: 1463 *val = fdt32_to_cpu(*prop32); 1464 break; 1465 case 2: 1466 *val = fdt64_to_cpu(*prop64); 1467 break; 1468 default: 1469 return -FDT_ERR_NOSPACE; 1470 } 1471 1472 return 0; 1473 } 1474 1475 /** 1476 * fdt_read_range - Read a node's n'th range property 1477 * 1478 * @fdt: ptr to device tree 1479 * @node: offset of node 1480 * @n: range index 1481 * @child_addr: pointer to storage for the "child address" field 1482 * @addr: pointer to storage for the CPU view translated physical start 1483 * @len: pointer to storage for the range length 1484 * 1485 * Convenience function that reads and interprets a specific range out of 1486 * a number of the "ranges" property array. 1487 */ 1488 int fdt_read_range(void *fdt, int node, int n, uint64_t *child_addr, 1489 uint64_t *addr, uint64_t *len) 1490 { 1491 int pnode = fdt_parent_offset(fdt, node); 1492 const fdt32_t *ranges; 1493 int pacells; 1494 int acells; 1495 int scells; 1496 int ranges_len; 1497 int cell = 0; 1498 int r = 0; 1499 1500 /* 1501 * The "ranges" property is an array of 1502 * { <child address> <parent address> <size in child address space> } 1503 * 1504 * All 3 elements can span a diffent number of cells. Fetch their size. 1505 */ 1506 pacells = fdt_getprop_u32_default_node(fdt, pnode, 0, "#address-cells", 1); 1507 acells = fdt_getprop_u32_default_node(fdt, node, 0, "#address-cells", 1); 1508 scells = fdt_getprop_u32_default_node(fdt, node, 0, "#size-cells", 1); 1509 1510 /* Now try to get the ranges property */ 1511 ranges = fdt_getprop(fdt, node, "ranges", &ranges_len); 1512 if (!ranges) 1513 return -FDT_ERR_NOTFOUND; 1514 ranges_len /= sizeof(uint32_t); 1515 1516 /* Jump to the n'th entry */ 1517 cell = n * (pacells + acells + scells); 1518 1519 /* Read <child address> */ 1520 if (child_addr) { 1521 r = fdt_read_prop(ranges, ranges_len, cell, child_addr, 1522 acells); 1523 if (r) 1524 return r; 1525 } 1526 cell += acells; 1527 1528 /* Read <parent address> */ 1529 if (addr) 1530 *addr = fdt_translate_address(fdt, node, ranges + cell); 1531 cell += pacells; 1532 1533 /* Read <size in child address space> */ 1534 if (len) { 1535 r = fdt_read_prop(ranges, ranges_len, cell, len, scells); 1536 if (r) 1537 return r; 1538 } 1539 1540 return 0; 1541 } 1542