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(const void *fdt, const char *nr_cells_name) 25 { 26 const fdt32_t *cell; 27 28 cell = fdt_getprop(fdt, 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 /* 384 * fdt_pack_reg - pack address and size array into the "reg"-suitable stream 385 */ 386 static int fdt_pack_reg(const void *fdt, void *buf, uint64_t *address, 387 uint64_t *size, int n) 388 { 389 int i; 390 int address_len = get_cells_len(fdt, "#address-cells"); 391 int size_len = get_cells_len(fdt, "#size-cells"); 392 char *p = buf; 393 394 for (i = 0; i < n; i++) { 395 if (address_len == 8) 396 *(fdt64_t *)p = cpu_to_fdt64(address[i]); 397 else 398 *(fdt32_t *)p = cpu_to_fdt32(address[i]); 399 p += address_len; 400 401 if (size_len == 8) 402 *(fdt64_t *)p = cpu_to_fdt64(size[i]); 403 else 404 *(fdt32_t *)p = cpu_to_fdt32(size[i]); 405 p += size_len; 406 } 407 408 return p - (char *)buf; 409 } 410 411 #ifdef CONFIG_NR_DRAM_BANKS 412 #define MEMORY_BANKS_MAX CONFIG_NR_DRAM_BANKS 413 #else 414 #define MEMORY_BANKS_MAX 4 415 #endif 416 int fdt_fixup_memory_banks(void *blob, u64 start[], u64 size[], int banks) 417 { 418 int err, nodeoffset; 419 int len; 420 u8 tmp[MEMORY_BANKS_MAX * 16]; /* Up to 64-bit address + 64-bit size */ 421 422 if (banks > MEMORY_BANKS_MAX) { 423 printf("%s: num banks %d exceeds hardcoded limit %d." 424 " Recompile with higher MEMORY_BANKS_MAX?\n", 425 __FUNCTION__, banks, MEMORY_BANKS_MAX); 426 return -1; 427 } 428 429 err = fdt_check_header(blob); 430 if (err < 0) { 431 printf("%s: %s\n", __FUNCTION__, fdt_strerror(err)); 432 return err; 433 } 434 435 /* find or create "/memory" node. */ 436 nodeoffset = fdt_find_or_add_subnode(blob, 0, "memory"); 437 if (nodeoffset < 0) 438 return nodeoffset; 439 440 err = fdt_setprop(blob, nodeoffset, "device_type", "memory", 441 sizeof("memory")); 442 if (err < 0) { 443 printf("WARNING: could not set %s %s.\n", "device_type", 444 fdt_strerror(err)); 445 return err; 446 } 447 448 len = fdt_pack_reg(blob, tmp, start, size, banks); 449 450 err = fdt_setprop(blob, nodeoffset, "reg", tmp, len); 451 if (err < 0) { 452 printf("WARNING: could not set %s %s.\n", 453 "reg", fdt_strerror(err)); 454 return err; 455 } 456 return 0; 457 } 458 459 int fdt_fixup_memory(void *blob, u64 start, u64 size) 460 { 461 return fdt_fixup_memory_banks(blob, &start, &size, 1); 462 } 463 464 void fdt_fixup_ethernet(void *fdt) 465 { 466 int node, i, j; 467 char enet[16], *tmp, *end; 468 char mac[16]; 469 const char *path; 470 unsigned char mac_addr[6]; 471 472 node = fdt_path_offset(fdt, "/aliases"); 473 if (node < 0) 474 return; 475 476 if (!getenv("ethaddr")) { 477 if (getenv("usbethaddr")) { 478 strcpy(mac, "usbethaddr"); 479 } else { 480 debug("No ethernet MAC Address defined\n"); 481 return; 482 } 483 } else { 484 strcpy(mac, "ethaddr"); 485 } 486 487 i = 0; 488 while ((tmp = getenv(mac)) != NULL) { 489 sprintf(enet, "ethernet%d", i); 490 path = fdt_getprop(fdt, node, enet, NULL); 491 if (!path) { 492 debug("No alias for %s\n", enet); 493 sprintf(mac, "eth%daddr", ++i); 494 continue; 495 } 496 497 for (j = 0; j < 6; j++) { 498 mac_addr[j] = tmp ? simple_strtoul(tmp, &end, 16) : 0; 499 if (tmp) 500 tmp = (*end) ? end+1 : end; 501 } 502 503 do_fixup_by_path(fdt, path, "mac-address", &mac_addr, 6, 0); 504 do_fixup_by_path(fdt, path, "local-mac-address", 505 &mac_addr, 6, 1); 506 507 sprintf(mac, "eth%daddr", ++i); 508 } 509 } 510 511 /* Resize the fdt to its actual size + a bit of padding */ 512 int fdt_resize(void *blob) 513 { 514 int i; 515 uint64_t addr, size; 516 int total, ret; 517 uint actualsize; 518 519 if (!blob) 520 return 0; 521 522 total = fdt_num_mem_rsv(blob); 523 for (i = 0; i < total; i++) { 524 fdt_get_mem_rsv(blob, i, &addr, &size); 525 if (addr == (uintptr_t)blob) { 526 fdt_del_mem_rsv(blob, i); 527 break; 528 } 529 } 530 531 /* 532 * Calculate the actual size of the fdt 533 * plus the size needed for 5 fdt_add_mem_rsv, one 534 * for the fdt itself and 4 for a possible initrd 535 * ((initrd-start + initrd-end) * 2 (name & value)) 536 */ 537 actualsize = fdt_off_dt_strings(blob) + 538 fdt_size_dt_strings(blob) + 5 * sizeof(struct fdt_reserve_entry); 539 540 /* Make it so the fdt ends on a page boundary */ 541 actualsize = ALIGN(actualsize + ((uintptr_t)blob & 0xfff), 0x1000); 542 actualsize = actualsize - ((uintptr_t)blob & 0xfff); 543 544 /* Change the fdt header to reflect the correct size */ 545 fdt_set_totalsize(blob, actualsize); 546 547 /* Add the new reservation */ 548 ret = fdt_add_mem_rsv(blob, (uintptr_t)blob, actualsize); 549 if (ret < 0) 550 return ret; 551 552 return actualsize; 553 } 554 555 #ifdef CONFIG_PCI 556 #define CONFIG_SYS_PCI_NR_INBOUND_WIN 4 557 558 #define FDT_PCI_PREFETCH (0x40000000) 559 #define FDT_PCI_MEM32 (0x02000000) 560 #define FDT_PCI_IO (0x01000000) 561 #define FDT_PCI_MEM64 (0x03000000) 562 563 int fdt_pci_dma_ranges(void *blob, int phb_off, struct pci_controller *hose) { 564 565 int addrcell, sizecell, len, r; 566 u32 *dma_range; 567 /* sized based on pci addr cells, size-cells, & address-cells */ 568 u32 dma_ranges[(3 + 2 + 2) * CONFIG_SYS_PCI_NR_INBOUND_WIN]; 569 570 addrcell = fdt_getprop_u32_default(blob, "/", "#address-cells", 1); 571 sizecell = fdt_getprop_u32_default(blob, "/", "#size-cells", 1); 572 573 dma_range = &dma_ranges[0]; 574 for (r = 0; r < hose->region_count; r++) { 575 u64 bus_start, phys_start, size; 576 577 /* skip if !PCI_REGION_SYS_MEMORY */ 578 if (!(hose->regions[r].flags & PCI_REGION_SYS_MEMORY)) 579 continue; 580 581 bus_start = (u64)hose->regions[r].bus_start; 582 phys_start = (u64)hose->regions[r].phys_start; 583 size = (u64)hose->regions[r].size; 584 585 dma_range[0] = 0; 586 if (size >= 0x100000000ull) 587 dma_range[0] |= FDT_PCI_MEM64; 588 else 589 dma_range[0] |= FDT_PCI_MEM32; 590 if (hose->regions[r].flags & PCI_REGION_PREFETCH) 591 dma_range[0] |= FDT_PCI_PREFETCH; 592 #ifdef CONFIG_SYS_PCI_64BIT 593 dma_range[1] = bus_start >> 32; 594 #else 595 dma_range[1] = 0; 596 #endif 597 dma_range[2] = bus_start & 0xffffffff; 598 599 if (addrcell == 2) { 600 dma_range[3] = phys_start >> 32; 601 dma_range[4] = phys_start & 0xffffffff; 602 } else { 603 dma_range[3] = phys_start & 0xffffffff; 604 } 605 606 if (sizecell == 2) { 607 dma_range[3 + addrcell + 0] = size >> 32; 608 dma_range[3 + addrcell + 1] = size & 0xffffffff; 609 } else { 610 dma_range[3 + addrcell + 0] = size & 0xffffffff; 611 } 612 613 dma_range += (3 + addrcell + sizecell); 614 } 615 616 len = dma_range - &dma_ranges[0]; 617 if (len) 618 fdt_setprop(blob, phb_off, "dma-ranges", &dma_ranges[0], len*4); 619 620 return 0; 621 } 622 #endif 623 624 #ifdef CONFIG_FDT_FIXUP_NOR_FLASH_SIZE 625 /* 626 * Provide a weak default function to return the flash bank size. 627 * There might be multiple non-identical flash chips connected to one 628 * chip-select, so we need to pass an index as well. 629 */ 630 u32 __flash_get_bank_size(int cs, int idx) 631 { 632 extern flash_info_t flash_info[]; 633 634 /* 635 * As default, a simple 1:1 mapping is provided. Boards with 636 * a different mapping need to supply a board specific mapping 637 * routine. 638 */ 639 return flash_info[cs].size; 640 } 641 u32 flash_get_bank_size(int cs, int idx) 642 __attribute__((weak, alias("__flash_get_bank_size"))); 643 644 /* 645 * This function can be used to update the size in the "reg" property 646 * of all NOR FLASH device nodes. This is necessary for boards with 647 * non-fixed NOR FLASH sizes. 648 */ 649 int fdt_fixup_nor_flash_size(void *blob) 650 { 651 char compat[][16] = { "cfi-flash", "jedec-flash" }; 652 int off; 653 int len; 654 struct fdt_property *prop; 655 u32 *reg, *reg2; 656 int i; 657 658 for (i = 0; i < 2; i++) { 659 off = fdt_node_offset_by_compatible(blob, -1, compat[i]); 660 while (off != -FDT_ERR_NOTFOUND) { 661 int idx; 662 663 /* 664 * Found one compatible node, so fixup the size 665 * int its reg properties 666 */ 667 prop = fdt_get_property_w(blob, off, "reg", &len); 668 if (prop) { 669 int tuple_size = 3 * sizeof(reg); 670 671 /* 672 * There might be multiple reg-tuples, 673 * so loop through them all 674 */ 675 reg = reg2 = (u32 *)&prop->data[0]; 676 for (idx = 0; idx < (len / tuple_size); idx++) { 677 /* 678 * Update size in reg property 679 */ 680 reg[2] = flash_get_bank_size(reg[0], 681 idx); 682 683 /* 684 * Point to next reg tuple 685 */ 686 reg += 3; 687 } 688 689 fdt_setprop(blob, off, "reg", reg2, len); 690 } 691 692 /* Move to next compatible node */ 693 off = fdt_node_offset_by_compatible(blob, off, 694 compat[i]); 695 } 696 } 697 698 return 0; 699 } 700 #endif 701 702 int fdt_increase_size(void *fdt, int add_len) 703 { 704 int newlen; 705 706 newlen = fdt_totalsize(fdt) + add_len; 707 708 /* Open in place with a new len */ 709 return fdt_open_into(fdt, fdt, newlen); 710 } 711 712 #ifdef CONFIG_FDT_FIXUP_PARTITIONS 713 #include <jffs2/load_kernel.h> 714 #include <mtd_node.h> 715 716 struct reg_cell { 717 unsigned int r0; 718 unsigned int r1; 719 }; 720 721 int fdt_del_subnodes(const void *blob, int parent_offset) 722 { 723 int off, ndepth; 724 int ret; 725 726 for (ndepth = 0, off = fdt_next_node(blob, parent_offset, &ndepth); 727 (off >= 0) && (ndepth > 0); 728 off = fdt_next_node(blob, off, &ndepth)) { 729 if (ndepth == 1) { 730 debug("delete %s: offset: %x\n", 731 fdt_get_name(blob, off, 0), off); 732 ret = fdt_del_node((void *)blob, off); 733 if (ret < 0) { 734 printf("Can't delete node: %s\n", 735 fdt_strerror(ret)); 736 return ret; 737 } else { 738 ndepth = 0; 739 off = parent_offset; 740 } 741 } 742 } 743 return 0; 744 } 745 746 int fdt_del_partitions(void *blob, int parent_offset) 747 { 748 const void *prop; 749 int ndepth = 0; 750 int off; 751 int ret; 752 753 off = fdt_next_node(blob, parent_offset, &ndepth); 754 if (off > 0 && ndepth == 1) { 755 prop = fdt_getprop(blob, off, "label", NULL); 756 if (prop == NULL) { 757 /* 758 * Could not find label property, nand {}; node? 759 * Check subnode, delete partitions there if any. 760 */ 761 return fdt_del_partitions(blob, off); 762 } else { 763 ret = fdt_del_subnodes(blob, parent_offset); 764 if (ret < 0) { 765 printf("Can't remove subnodes: %s\n", 766 fdt_strerror(ret)); 767 return ret; 768 } 769 } 770 } 771 return 0; 772 } 773 774 int fdt_node_set_part_info(void *blob, int parent_offset, 775 struct mtd_device *dev) 776 { 777 struct list_head *pentry; 778 struct part_info *part; 779 struct reg_cell cell; 780 int off, ndepth = 0; 781 int part_num, ret; 782 char buf[64]; 783 784 ret = fdt_del_partitions(blob, parent_offset); 785 if (ret < 0) 786 return ret; 787 788 /* 789 * Check if it is nand {}; subnode, adjust 790 * the offset in this case 791 */ 792 off = fdt_next_node(blob, parent_offset, &ndepth); 793 if (off > 0 && ndepth == 1) 794 parent_offset = off; 795 796 part_num = 0; 797 list_for_each_prev(pentry, &dev->parts) { 798 int newoff; 799 800 part = list_entry(pentry, struct part_info, link); 801 802 debug("%2d: %-20s0x%08llx\t0x%08llx\t%d\n", 803 part_num, part->name, part->size, 804 part->offset, part->mask_flags); 805 806 sprintf(buf, "partition@%llx", part->offset); 807 add_sub: 808 ret = fdt_add_subnode(blob, parent_offset, buf); 809 if (ret == -FDT_ERR_NOSPACE) { 810 ret = fdt_increase_size(blob, 512); 811 if (!ret) 812 goto add_sub; 813 else 814 goto err_size; 815 } else if (ret < 0) { 816 printf("Can't add partition node: %s\n", 817 fdt_strerror(ret)); 818 return ret; 819 } 820 newoff = ret; 821 822 /* Check MTD_WRITEABLE_CMD flag */ 823 if (part->mask_flags & 1) { 824 add_ro: 825 ret = fdt_setprop(blob, newoff, "read_only", NULL, 0); 826 if (ret == -FDT_ERR_NOSPACE) { 827 ret = fdt_increase_size(blob, 512); 828 if (!ret) 829 goto add_ro; 830 else 831 goto err_size; 832 } else if (ret < 0) 833 goto err_prop; 834 } 835 836 cell.r0 = cpu_to_fdt32(part->offset); 837 cell.r1 = cpu_to_fdt32(part->size); 838 add_reg: 839 ret = fdt_setprop(blob, newoff, "reg", &cell, sizeof(cell)); 840 if (ret == -FDT_ERR_NOSPACE) { 841 ret = fdt_increase_size(blob, 512); 842 if (!ret) 843 goto add_reg; 844 else 845 goto err_size; 846 } else if (ret < 0) 847 goto err_prop; 848 849 add_label: 850 ret = fdt_setprop_string(blob, newoff, "label", part->name); 851 if (ret == -FDT_ERR_NOSPACE) { 852 ret = fdt_increase_size(blob, 512); 853 if (!ret) 854 goto add_label; 855 else 856 goto err_size; 857 } else if (ret < 0) 858 goto err_prop; 859 860 part_num++; 861 } 862 return 0; 863 err_size: 864 printf("Can't increase blob size: %s\n", fdt_strerror(ret)); 865 return ret; 866 err_prop: 867 printf("Can't add property: %s\n", fdt_strerror(ret)); 868 return ret; 869 } 870 871 /* 872 * Update partitions in nor/nand nodes using info from 873 * mtdparts environment variable. The nodes to update are 874 * specified by node_info structure which contains mtd device 875 * type and compatible string: E. g. the board code in 876 * ft_board_setup() could use: 877 * 878 * struct node_info nodes[] = { 879 * { "fsl,mpc5121-nfc", MTD_DEV_TYPE_NAND, }, 880 * { "cfi-flash", MTD_DEV_TYPE_NOR, }, 881 * }; 882 * 883 * fdt_fixup_mtdparts(blob, nodes, ARRAY_SIZE(nodes)); 884 */ 885 void fdt_fixup_mtdparts(void *blob, void *node_info, int node_info_size) 886 { 887 struct node_info *ni = node_info; 888 struct mtd_device *dev; 889 char *parts; 890 int i, idx; 891 int noff; 892 893 parts = getenv("mtdparts"); 894 if (!parts) 895 return; 896 897 if (mtdparts_init() != 0) 898 return; 899 900 for (i = 0; i < node_info_size; i++) { 901 idx = 0; 902 noff = fdt_node_offset_by_compatible(blob, -1, ni[i].compat); 903 while (noff != -FDT_ERR_NOTFOUND) { 904 debug("%s: %s, mtd dev type %d\n", 905 fdt_get_name(blob, noff, 0), 906 ni[i].compat, ni[i].type); 907 dev = device_find(ni[i].type, idx++); 908 if (dev) { 909 if (fdt_node_set_part_info(blob, noff, dev)) 910 return; /* return on error */ 911 } 912 913 /* Jump to next flash node */ 914 noff = fdt_node_offset_by_compatible(blob, noff, 915 ni[i].compat); 916 } 917 } 918 } 919 #endif 920 921 void fdt_del_node_and_alias(void *blob, const char *alias) 922 { 923 int off = fdt_path_offset(blob, alias); 924 925 if (off < 0) 926 return; 927 928 fdt_del_node(blob, off); 929 930 off = fdt_path_offset(blob, "/aliases"); 931 fdt_delprop(blob, off, alias); 932 } 933 934 /* Helper to read a big number; size is in cells (not bytes) */ 935 static inline u64 of_read_number(const fdt32_t *cell, int size) 936 { 937 u64 r = 0; 938 while (size--) 939 r = (r << 32) | fdt32_to_cpu(*(cell++)); 940 return r; 941 } 942 943 #define PRu64 "%llx" 944 945 /* Max address size we deal with */ 946 #define OF_MAX_ADDR_CELLS 4 947 #define OF_BAD_ADDR ((u64)-1) 948 #define OF_CHECK_COUNTS(na, ns) ((na) > 0 && (na) <= OF_MAX_ADDR_CELLS && \ 949 (ns) > 0) 950 951 /* Debug utility */ 952 #ifdef DEBUG 953 static void of_dump_addr(const char *s, const fdt32_t *addr, int na) 954 { 955 printf("%s", s); 956 while(na--) 957 printf(" %08x", *(addr++)); 958 printf("\n"); 959 } 960 #else 961 static void of_dump_addr(const char *s, const fdt32_t *addr, int na) { } 962 #endif 963 964 /* Callbacks for bus specific translators */ 965 struct of_bus { 966 const char *name; 967 const char *addresses; 968 void (*count_cells)(void *blob, int parentoffset, 969 int *addrc, int *sizec); 970 u64 (*map)(fdt32_t *addr, const fdt32_t *range, 971 int na, int ns, int pna); 972 int (*translate)(fdt32_t *addr, u64 offset, int na); 973 }; 974 975 /* Default translator (generic bus) */ 976 static void of_bus_default_count_cells(void *blob, int parentoffset, 977 int *addrc, int *sizec) 978 { 979 const fdt32_t *prop; 980 981 if (addrc) { 982 prop = fdt_getprop(blob, parentoffset, "#address-cells", NULL); 983 if (prop) 984 *addrc = be32_to_cpup(prop); 985 else 986 *addrc = 2; 987 } 988 989 if (sizec) { 990 prop = fdt_getprop(blob, parentoffset, "#size-cells", NULL); 991 if (prop) 992 *sizec = be32_to_cpup(prop); 993 else 994 *sizec = 1; 995 } 996 } 997 998 static u64 of_bus_default_map(fdt32_t *addr, const fdt32_t *range, 999 int na, int ns, int pna) 1000 { 1001 u64 cp, s, da; 1002 1003 cp = of_read_number(range, na); 1004 s = of_read_number(range + na + pna, ns); 1005 da = of_read_number(addr, na); 1006 1007 debug("OF: default map, cp="PRu64", s="PRu64", da="PRu64"\n", 1008 cp, s, da); 1009 1010 if (da < cp || da >= (cp + s)) 1011 return OF_BAD_ADDR; 1012 return da - cp; 1013 } 1014 1015 static int of_bus_default_translate(fdt32_t *addr, u64 offset, int na) 1016 { 1017 u64 a = of_read_number(addr, na); 1018 memset(addr, 0, na * 4); 1019 a += offset; 1020 if (na > 1) 1021 addr[na - 2] = cpu_to_fdt32(a >> 32); 1022 addr[na - 1] = cpu_to_fdt32(a & 0xffffffffu); 1023 1024 return 0; 1025 } 1026 1027 /* Array of bus specific translators */ 1028 static struct of_bus of_busses[] = { 1029 /* Default */ 1030 { 1031 .name = "default", 1032 .addresses = "reg", 1033 .count_cells = of_bus_default_count_cells, 1034 .map = of_bus_default_map, 1035 .translate = of_bus_default_translate, 1036 }, 1037 }; 1038 1039 static int of_translate_one(void * blob, int parent, struct of_bus *bus, 1040 struct of_bus *pbus, fdt32_t *addr, 1041 int na, int ns, int pna, const char *rprop) 1042 { 1043 const fdt32_t *ranges; 1044 int rlen; 1045 int rone; 1046 u64 offset = OF_BAD_ADDR; 1047 1048 /* Normally, an absence of a "ranges" property means we are 1049 * crossing a non-translatable boundary, and thus the addresses 1050 * below the current not cannot be converted to CPU physical ones. 1051 * Unfortunately, while this is very clear in the spec, it's not 1052 * what Apple understood, and they do have things like /uni-n or 1053 * /ht nodes with no "ranges" property and a lot of perfectly 1054 * useable mapped devices below them. Thus we treat the absence of 1055 * "ranges" as equivalent to an empty "ranges" property which means 1056 * a 1:1 translation at that level. It's up to the caller not to try 1057 * to translate addresses that aren't supposed to be translated in 1058 * the first place. --BenH. 1059 */ 1060 ranges = fdt_getprop(blob, parent, rprop, &rlen); 1061 if (ranges == NULL || rlen == 0) { 1062 offset = of_read_number(addr, na); 1063 memset(addr, 0, pna * 4); 1064 debug("OF: no ranges, 1:1 translation\n"); 1065 goto finish; 1066 } 1067 1068 debug("OF: walking ranges...\n"); 1069 1070 /* Now walk through the ranges */ 1071 rlen /= 4; 1072 rone = na + pna + ns; 1073 for (; rlen >= rone; rlen -= rone, ranges += rone) { 1074 offset = bus->map(addr, ranges, na, ns, pna); 1075 if (offset != OF_BAD_ADDR) 1076 break; 1077 } 1078 if (offset == OF_BAD_ADDR) { 1079 debug("OF: not found !\n"); 1080 return 1; 1081 } 1082 memcpy(addr, ranges + na, 4 * pna); 1083 1084 finish: 1085 of_dump_addr("OF: parent translation for:", addr, pna); 1086 debug("OF: with offset: "PRu64"\n", offset); 1087 1088 /* Translate it into parent bus space */ 1089 return pbus->translate(addr, offset, pna); 1090 } 1091 1092 /* 1093 * Translate an address from the device-tree into a CPU physical address, 1094 * this walks up the tree and applies the various bus mappings on the 1095 * way. 1096 * 1097 * Note: We consider that crossing any level with #size-cells == 0 to mean 1098 * that translation is impossible (that is we are not dealing with a value 1099 * that can be mapped to a cpu physical address). This is not really specified 1100 * that way, but this is traditionally the way IBM at least do things 1101 */ 1102 static u64 __of_translate_address(void *blob, int node_offset, const fdt32_t *in_addr, 1103 const char *rprop) 1104 { 1105 int parent; 1106 struct of_bus *bus, *pbus; 1107 fdt32_t addr[OF_MAX_ADDR_CELLS]; 1108 int na, ns, pna, pns; 1109 u64 result = OF_BAD_ADDR; 1110 1111 debug("OF: ** translation for device %s **\n", 1112 fdt_get_name(blob, node_offset, NULL)); 1113 1114 /* Get parent & match bus type */ 1115 parent = fdt_parent_offset(blob, node_offset); 1116 if (parent < 0) 1117 goto bail; 1118 bus = &of_busses[0]; 1119 1120 /* Cound address cells & copy address locally */ 1121 bus->count_cells(blob, parent, &na, &ns); 1122 if (!OF_CHECK_COUNTS(na, ns)) { 1123 printf("%s: Bad cell count for %s\n", __FUNCTION__, 1124 fdt_get_name(blob, node_offset, NULL)); 1125 goto bail; 1126 } 1127 memcpy(addr, in_addr, na * 4); 1128 1129 debug("OF: bus is %s (na=%d, ns=%d) on %s\n", 1130 bus->name, na, ns, fdt_get_name(blob, parent, NULL)); 1131 of_dump_addr("OF: translating address:", addr, na); 1132 1133 /* Translate */ 1134 for (;;) { 1135 /* Switch to parent bus */ 1136 node_offset = parent; 1137 parent = fdt_parent_offset(blob, node_offset); 1138 1139 /* If root, we have finished */ 1140 if (parent < 0) { 1141 debug("OF: reached root node\n"); 1142 result = of_read_number(addr, na); 1143 break; 1144 } 1145 1146 /* Get new parent bus and counts */ 1147 pbus = &of_busses[0]; 1148 pbus->count_cells(blob, parent, &pna, &pns); 1149 if (!OF_CHECK_COUNTS(pna, pns)) { 1150 printf("%s: Bad cell count for %s\n", __FUNCTION__, 1151 fdt_get_name(blob, node_offset, NULL)); 1152 break; 1153 } 1154 1155 debug("OF: parent bus is %s (na=%d, ns=%d) on %s\n", 1156 pbus->name, pna, pns, fdt_get_name(blob, parent, NULL)); 1157 1158 /* Apply bus translation */ 1159 if (of_translate_one(blob, node_offset, bus, pbus, 1160 addr, na, ns, pna, rprop)) 1161 break; 1162 1163 /* Complete the move up one level */ 1164 na = pna; 1165 ns = pns; 1166 bus = pbus; 1167 1168 of_dump_addr("OF: one level translation:", addr, na); 1169 } 1170 bail: 1171 1172 return result; 1173 } 1174 1175 u64 fdt_translate_address(void *blob, int node_offset, const fdt32_t *in_addr) 1176 { 1177 return __of_translate_address(blob, node_offset, in_addr, "ranges"); 1178 } 1179 1180 /** 1181 * fdt_node_offset_by_compat_reg: Find a node that matches compatiable and 1182 * who's reg property matches a physical cpu address 1183 * 1184 * @blob: ptr to device tree 1185 * @compat: compatiable string to match 1186 * @compat_off: property name 1187 * 1188 */ 1189 int fdt_node_offset_by_compat_reg(void *blob, const char *compat, 1190 phys_addr_t compat_off) 1191 { 1192 int len, off = fdt_node_offset_by_compatible(blob, -1, compat); 1193 while (off != -FDT_ERR_NOTFOUND) { 1194 const fdt32_t *reg = fdt_getprop(blob, off, "reg", &len); 1195 if (reg) { 1196 if (compat_off == fdt_translate_address(blob, off, reg)) 1197 return off; 1198 } 1199 off = fdt_node_offset_by_compatible(blob, off, compat); 1200 } 1201 1202 return -FDT_ERR_NOTFOUND; 1203 } 1204 1205 /** 1206 * fdt_alloc_phandle: Return next free phandle value 1207 * 1208 * @blob: ptr to device tree 1209 */ 1210 int fdt_alloc_phandle(void *blob) 1211 { 1212 int offset, phandle = 0; 1213 1214 for (offset = fdt_next_node(blob, -1, NULL); offset >= 0; 1215 offset = fdt_next_node(blob, offset, NULL)) { 1216 phandle = max(phandle, fdt_get_phandle(blob, offset)); 1217 } 1218 1219 return phandle + 1; 1220 } 1221 1222 /* 1223 * fdt_set_phandle: Create a phandle property for the given node 1224 * 1225 * @fdt: ptr to device tree 1226 * @nodeoffset: node to update 1227 * @phandle: phandle value to set (must be unique) 1228 */ 1229 int fdt_set_phandle(void *fdt, int nodeoffset, uint32_t phandle) 1230 { 1231 int ret; 1232 1233 #ifdef DEBUG 1234 int off = fdt_node_offset_by_phandle(fdt, phandle); 1235 1236 if ((off >= 0) && (off != nodeoffset)) { 1237 char buf[64]; 1238 1239 fdt_get_path(fdt, nodeoffset, buf, sizeof(buf)); 1240 printf("Trying to update node %s with phandle %u ", 1241 buf, phandle); 1242 1243 fdt_get_path(fdt, off, buf, sizeof(buf)); 1244 printf("that already exists in node %s.\n", buf); 1245 return -FDT_ERR_BADPHANDLE; 1246 } 1247 #endif 1248 1249 ret = fdt_setprop_cell(fdt, nodeoffset, "phandle", phandle); 1250 if (ret < 0) 1251 return ret; 1252 1253 /* 1254 * For now, also set the deprecated "linux,phandle" property, so that we 1255 * don't break older kernels. 1256 */ 1257 ret = fdt_setprop_cell(fdt, nodeoffset, "linux,phandle", phandle); 1258 1259 return ret; 1260 } 1261 1262 /* 1263 * fdt_create_phandle: Create a phandle property for the given node 1264 * 1265 * @fdt: ptr to device tree 1266 * @nodeoffset: node to update 1267 */ 1268 unsigned int fdt_create_phandle(void *fdt, int nodeoffset) 1269 { 1270 /* see if there is a phandle already */ 1271 int phandle = fdt_get_phandle(fdt, nodeoffset); 1272 1273 /* if we got 0, means no phandle so create one */ 1274 if (phandle == 0) { 1275 int ret; 1276 1277 phandle = fdt_alloc_phandle(fdt); 1278 ret = fdt_set_phandle(fdt, nodeoffset, phandle); 1279 if (ret < 0) { 1280 printf("Can't set phandle %u: %s\n", phandle, 1281 fdt_strerror(ret)); 1282 return 0; 1283 } 1284 } 1285 1286 return phandle; 1287 } 1288 1289 /* 1290 * fdt_set_node_status: Set status for the given node 1291 * 1292 * @fdt: ptr to device tree 1293 * @nodeoffset: node to update 1294 * @status: FDT_STATUS_OKAY, FDT_STATUS_DISABLED, 1295 * FDT_STATUS_FAIL, FDT_STATUS_FAIL_ERROR_CODE 1296 * @error_code: optional, only used if status is FDT_STATUS_FAIL_ERROR_CODE 1297 */ 1298 int fdt_set_node_status(void *fdt, int nodeoffset, 1299 enum fdt_status status, unsigned int error_code) 1300 { 1301 char buf[16]; 1302 int ret = 0; 1303 1304 if (nodeoffset < 0) 1305 return nodeoffset; 1306 1307 switch (status) { 1308 case FDT_STATUS_OKAY: 1309 ret = fdt_setprop_string(fdt, nodeoffset, "status", "okay"); 1310 break; 1311 case FDT_STATUS_DISABLED: 1312 ret = fdt_setprop_string(fdt, nodeoffset, "status", "disabled"); 1313 break; 1314 case FDT_STATUS_FAIL: 1315 ret = fdt_setprop_string(fdt, nodeoffset, "status", "fail"); 1316 break; 1317 case FDT_STATUS_FAIL_ERROR_CODE: 1318 sprintf(buf, "fail-%d", error_code); 1319 ret = fdt_setprop_string(fdt, nodeoffset, "status", buf); 1320 break; 1321 default: 1322 printf("Invalid fdt status: %x\n", status); 1323 ret = -1; 1324 break; 1325 } 1326 1327 return ret; 1328 } 1329 1330 /* 1331 * fdt_set_status_by_alias: Set status for the given node given an alias 1332 * 1333 * @fdt: ptr to device tree 1334 * @alias: alias of node to update 1335 * @status: FDT_STATUS_OKAY, FDT_STATUS_DISABLED, 1336 * FDT_STATUS_FAIL, FDT_STATUS_FAIL_ERROR_CODE 1337 * @error_code: optional, only used if status is FDT_STATUS_FAIL_ERROR_CODE 1338 */ 1339 int fdt_set_status_by_alias(void *fdt, const char* alias, 1340 enum fdt_status status, unsigned int error_code) 1341 { 1342 int offset = fdt_path_offset(fdt, alias); 1343 1344 return fdt_set_node_status(fdt, offset, status, error_code); 1345 } 1346 1347 #if defined(CONFIG_VIDEO) || defined(CONFIG_LCD) 1348 int fdt_add_edid(void *blob, const char *compat, unsigned char *edid_buf) 1349 { 1350 int noff; 1351 int ret; 1352 1353 noff = fdt_node_offset_by_compatible(blob, -1, compat); 1354 if (noff != -FDT_ERR_NOTFOUND) { 1355 debug("%s: %s\n", fdt_get_name(blob, noff, 0), compat); 1356 add_edid: 1357 ret = fdt_setprop(blob, noff, "edid", edid_buf, 128); 1358 if (ret == -FDT_ERR_NOSPACE) { 1359 ret = fdt_increase_size(blob, 512); 1360 if (!ret) 1361 goto add_edid; 1362 else 1363 goto err_size; 1364 } else if (ret < 0) { 1365 printf("Can't add property: %s\n", fdt_strerror(ret)); 1366 return ret; 1367 } 1368 } 1369 return 0; 1370 err_size: 1371 printf("Can't increase blob size: %s\n", fdt_strerror(ret)); 1372 return ret; 1373 } 1374 #endif 1375 1376 /* 1377 * Verify the physical address of device tree node for a given alias 1378 * 1379 * This function locates the device tree node of a given alias, and then 1380 * verifies that the physical address of that device matches the given 1381 * parameter. It displays a message if there is a mismatch. 1382 * 1383 * Returns 1 on success, 0 on failure 1384 */ 1385 int fdt_verify_alias_address(void *fdt, int anode, const char *alias, u64 addr) 1386 { 1387 const char *path; 1388 const fdt32_t *reg; 1389 int node, len; 1390 u64 dt_addr; 1391 1392 path = fdt_getprop(fdt, anode, alias, NULL); 1393 if (!path) { 1394 /* If there's no such alias, then it's not a failure */ 1395 return 1; 1396 } 1397 1398 node = fdt_path_offset(fdt, path); 1399 if (node < 0) { 1400 printf("Warning: device tree alias '%s' points to invalid " 1401 "node %s.\n", alias, path); 1402 return 0; 1403 } 1404 1405 reg = fdt_getprop(fdt, node, "reg", &len); 1406 if (!reg) { 1407 printf("Warning: device tree node '%s' has no address.\n", 1408 path); 1409 return 0; 1410 } 1411 1412 dt_addr = fdt_translate_address(fdt, node, reg); 1413 if (addr != dt_addr) { 1414 printf("Warning: U-Boot configured device %s at address %llx,\n" 1415 " but the device tree has it address %llx.\n", 1416 alias, addr, dt_addr); 1417 return 0; 1418 } 1419 1420 return 1; 1421 } 1422 1423 /* 1424 * Returns the base address of an SOC or PCI node 1425 */ 1426 u64 fdt_get_base_address(void *fdt, int node) 1427 { 1428 int size; 1429 u32 naddr; 1430 const fdt32_t *prop; 1431 1432 prop = fdt_getprop(fdt, node, "#address-cells", &size); 1433 if (prop && size == 4) 1434 naddr = be32_to_cpup(prop); 1435 else 1436 naddr = 2; 1437 1438 prop = fdt_getprop(fdt, node, "ranges", &size); 1439 1440 return prop ? fdt_translate_address(fdt, node, prop + naddr) : 0; 1441 } 1442 1443 /* 1444 * Read a property of size <prop_len>. Currently only supports 1 or 2 cells. 1445 */ 1446 static int fdt_read_prop(const fdt32_t *prop, int prop_len, int cell_off, 1447 uint64_t *val, int cells) 1448 { 1449 const fdt32_t *prop32 = &prop[cell_off]; 1450 const fdt64_t *prop64 = (const fdt64_t *)&prop[cell_off]; 1451 1452 if ((cell_off + cells) > prop_len) 1453 return -FDT_ERR_NOSPACE; 1454 1455 switch (cells) { 1456 case 1: 1457 *val = fdt32_to_cpu(*prop32); 1458 break; 1459 case 2: 1460 *val = fdt64_to_cpu(*prop64); 1461 break; 1462 default: 1463 return -FDT_ERR_NOSPACE; 1464 } 1465 1466 return 0; 1467 } 1468 1469 /** 1470 * fdt_read_range - Read a node's n'th range property 1471 * 1472 * @fdt: ptr to device tree 1473 * @node: offset of node 1474 * @n: range index 1475 * @child_addr: pointer to storage for the "child address" field 1476 * @addr: pointer to storage for the CPU view translated physical start 1477 * @len: pointer to storage for the range length 1478 * 1479 * Convenience function that reads and interprets a specific range out of 1480 * a number of the "ranges" property array. 1481 */ 1482 int fdt_read_range(void *fdt, int node, int n, uint64_t *child_addr, 1483 uint64_t *addr, uint64_t *len) 1484 { 1485 int pnode = fdt_parent_offset(fdt, node); 1486 const fdt32_t *ranges; 1487 int pacells; 1488 int acells; 1489 int scells; 1490 int ranges_len; 1491 int cell = 0; 1492 int r = 0; 1493 1494 /* 1495 * The "ranges" property is an array of 1496 * { <child address> <parent address> <size in child address space> } 1497 * 1498 * All 3 elements can span a diffent number of cells. Fetch their size. 1499 */ 1500 pacells = fdt_getprop_u32_default_node(fdt, pnode, 0, "#address-cells", 1); 1501 acells = fdt_getprop_u32_default_node(fdt, node, 0, "#address-cells", 1); 1502 scells = fdt_getprop_u32_default_node(fdt, node, 0, "#size-cells", 1); 1503 1504 /* Now try to get the ranges property */ 1505 ranges = fdt_getprop(fdt, node, "ranges", &ranges_len); 1506 if (!ranges) 1507 return -FDT_ERR_NOTFOUND; 1508 ranges_len /= sizeof(uint32_t); 1509 1510 /* Jump to the n'th entry */ 1511 cell = n * (pacells + acells + scells); 1512 1513 /* Read <child address> */ 1514 if (child_addr) { 1515 r = fdt_read_prop(ranges, ranges_len, cell, child_addr, 1516 acells); 1517 if (r) 1518 return r; 1519 } 1520 cell += acells; 1521 1522 /* Read <parent address> */ 1523 if (addr) 1524 *addr = fdt_translate_address(fdt, node, ranges + cell); 1525 cell += pacells; 1526 1527 /* Read <size in child address space> */ 1528 if (len) { 1529 r = fdt_read_prop(ranges, ranges_len, cell, len, scells); 1530 if (r) 1531 return r; 1532 } 1533 1534 return 0; 1535 } 1536