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