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