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 * fdt_getprop_u32_default_node - Return a node's property or a default 37 * 38 * @fdt: ptr to device tree 39 * @off: offset of node 40 * @cell: cell offset in property 41 * @prop: property name 42 * @dflt: default value if the property isn't found 43 * 44 * Convenience function to return a node's property or a default value if 45 * the property doesn't exist. 46 */ 47 u32 fdt_getprop_u32_default_node(const void *fdt, int off, int cell, 48 const char *prop, const u32 dflt) 49 { 50 const fdt32_t *val; 51 int len; 52 53 val = fdt_getprop(fdt, off, prop, &len); 54 55 /* Check if property exists */ 56 if (!val) 57 return dflt; 58 59 /* Check if property is long enough */ 60 if (len < ((cell + 1) * sizeof(uint32_t))) 61 return dflt; 62 63 return fdt32_to_cpu(*val); 64 } 65 66 /** 67 * fdt_getprop_u32_default - Find a node and return it's property or a default 68 * 69 * @fdt: ptr to device tree 70 * @path: path of node 71 * @prop: property name 72 * @dflt: default value if the property isn't found 73 * 74 * Convenience function to find a node and return it's property or a 75 * default value if it doesn't exist. 76 */ 77 u32 fdt_getprop_u32_default(const void *fdt, const char *path, 78 const char *prop, const u32 dflt) 79 { 80 int off; 81 82 off = fdt_path_offset(fdt, path); 83 if (off < 0) 84 return dflt; 85 86 return fdt_getprop_u32_default_node(fdt, off, 0, prop, dflt); 87 } 88 89 /** 90 * fdt_find_and_setprop: Find a node and set it's property 91 * 92 * @fdt: ptr to device tree 93 * @node: path of node 94 * @prop: property name 95 * @val: ptr to new value 96 * @len: length of new property value 97 * @create: flag to create the property if it doesn't exist 98 * 99 * Convenience function to directly set a property given the path to the node. 100 */ 101 int fdt_find_and_setprop(void *fdt, const char *node, const char *prop, 102 const void *val, int len, int create) 103 { 104 int nodeoff = fdt_path_offset(fdt, node); 105 106 if (nodeoff < 0) 107 return nodeoff; 108 109 if ((!create) && (fdt_get_property(fdt, nodeoff, prop, NULL) == NULL)) 110 return 0; /* create flag not set; so exit quietly */ 111 112 return fdt_setprop(fdt, nodeoff, prop, val, len); 113 } 114 115 /** 116 * fdt_find_or_add_subnode - find or possibly add a subnode of a given node 117 * @fdt: pointer to the device tree blob 118 * @parentoffset: structure block offset of a node 119 * @name: name of the subnode to locate 120 * 121 * fdt_subnode_offset() finds a subnode of the node with a given name. 122 * If the subnode does not exist, it will be created. 123 */ 124 static int fdt_find_or_add_subnode(void *fdt, int parentoffset, 125 const char *name) 126 { 127 int offset; 128 129 offset = fdt_subnode_offset(fdt, parentoffset, name); 130 131 if (offset == -FDT_ERR_NOTFOUND) 132 offset = fdt_add_subnode(fdt, parentoffset, name); 133 134 if (offset < 0) 135 printf("%s: %s: %s\n", __func__, name, fdt_strerror(offset)); 136 137 return offset; 138 } 139 140 /* rename to CONFIG_OF_STDOUT_PATH ? */ 141 #if defined(OF_STDOUT_PATH) 142 static int fdt_fixup_stdout(void *fdt, int chosenoff) 143 { 144 return fdt_setprop(fdt, chosenoff, "linux,stdout-path", 145 OF_STDOUT_PATH, strlen(OF_STDOUT_PATH) + 1); 146 } 147 #elif defined(CONFIG_OF_STDOUT_VIA_ALIAS) && defined(CONFIG_CONS_INDEX) 148 static void fdt_fill_multisername(char *sername, size_t maxlen) 149 { 150 const char *outname = stdio_devices[stdout]->name; 151 152 if (strcmp(outname, "serial") > 0) 153 strncpy(sername, outname, maxlen); 154 155 /* eserial? */ 156 if (strcmp(outname + 1, "serial") > 0) 157 strncpy(sername, outname + 1, maxlen); 158 } 159 160 static int fdt_fixup_stdout(void *fdt, int chosenoff) 161 { 162 int err; 163 int aliasoff; 164 char sername[9] = { 0 }; 165 const void *path; 166 int len; 167 char tmp[256]; /* long enough */ 168 169 fdt_fill_multisername(sername, sizeof(sername) - 1); 170 if (!sername[0]) 171 sprintf(sername, "serial%d", CONFIG_CONS_INDEX - 1); 172 173 aliasoff = fdt_path_offset(fdt, "/aliases"); 174 if (aliasoff < 0) { 175 err = aliasoff; 176 goto error; 177 } 178 179 path = fdt_getprop(fdt, aliasoff, sername, &len); 180 if (!path) { 181 err = len; 182 goto error; 183 } 184 185 /* fdt_setprop may break "path" so we copy it to tmp buffer */ 186 memcpy(tmp, path, len); 187 188 err = fdt_setprop(fdt, chosenoff, "linux,stdout-path", tmp, len); 189 error: 190 if (err < 0) 191 printf("WARNING: could not set linux,stdout-path %s.\n", 192 fdt_strerror(err)); 193 194 return err; 195 } 196 #else 197 static int fdt_fixup_stdout(void *fdt, int chosenoff) 198 { 199 return 0; 200 } 201 #endif 202 203 static inline int fdt_setprop_uxx(void *fdt, int nodeoffset, const char *name, 204 uint64_t val, int is_u64) 205 { 206 if (is_u64) 207 return fdt_setprop_u64(fdt, nodeoffset, name, val); 208 else 209 return fdt_setprop_u32(fdt, nodeoffset, name, (uint32_t)val); 210 } 211 212 213 int fdt_initrd(void *fdt, ulong initrd_start, ulong initrd_end) 214 { 215 int nodeoffset; 216 int err, j, total; 217 int is_u64; 218 uint64_t addr, size; 219 220 /* just return if the size of initrd is zero */ 221 if (initrd_start == initrd_end) 222 return 0; 223 224 /* find or create "/chosen" node. */ 225 nodeoffset = fdt_find_or_add_subnode(fdt, 0, "chosen"); 226 if (nodeoffset < 0) 227 return nodeoffset; 228 229 total = fdt_num_mem_rsv(fdt); 230 231 /* 232 * Look for an existing entry and update it. If we don't find 233 * the entry, we will j be the next available slot. 234 */ 235 for (j = 0; j < total; j++) { 236 err = fdt_get_mem_rsv(fdt, j, &addr, &size); 237 if (addr == initrd_start) { 238 fdt_del_mem_rsv(fdt, j); 239 break; 240 } 241 } 242 243 err = fdt_add_mem_rsv(fdt, initrd_start, initrd_end - initrd_start); 244 if (err < 0) { 245 printf("fdt_initrd: %s\n", fdt_strerror(err)); 246 return err; 247 } 248 249 is_u64 = (get_cells_len(fdt, "#address-cells") == 8); 250 251 err = fdt_setprop_uxx(fdt, nodeoffset, "linux,initrd-start", 252 (uint64_t)initrd_start, is_u64); 253 254 if (err < 0) { 255 printf("WARNING: could not set linux,initrd-start %s.\n", 256 fdt_strerror(err)); 257 return err; 258 } 259 260 err = fdt_setprop_uxx(fdt, nodeoffset, "linux,initrd-end", 261 (uint64_t)initrd_end, is_u64); 262 263 if (err < 0) { 264 printf("WARNING: could not set linux,initrd-end %s.\n", 265 fdt_strerror(err)); 266 267 return err; 268 } 269 270 return 0; 271 } 272 273 int fdt_chosen(void *fdt) 274 { 275 int nodeoffset; 276 int err; 277 char *str; /* used to set string properties */ 278 279 err = fdt_check_header(fdt); 280 if (err < 0) { 281 printf("fdt_chosen: %s\n", fdt_strerror(err)); 282 return err; 283 } 284 285 /* find or create "/chosen" node. */ 286 nodeoffset = fdt_find_or_add_subnode(fdt, 0, "chosen"); 287 if (nodeoffset < 0) 288 return nodeoffset; 289 290 str = getenv("bootargs"); 291 if (str) { 292 err = fdt_setprop(fdt, nodeoffset, "bootargs", str, 293 strlen(str) + 1); 294 if (err < 0) { 295 printf("WARNING: could not set bootargs %s.\n", 296 fdt_strerror(err)); 297 return err; 298 } 299 } 300 301 return fdt_fixup_stdout(fdt, nodeoffset); 302 } 303 304 void do_fixup_by_path(void *fdt, const char *path, const char *prop, 305 const void *val, int len, int create) 306 { 307 #if defined(DEBUG) 308 int i; 309 debug("Updating property '%s/%s' = ", path, prop); 310 for (i = 0; i < len; i++) 311 debug(" %.2x", *(u8*)(val+i)); 312 debug("\n"); 313 #endif 314 int rc = fdt_find_and_setprop(fdt, path, prop, val, len, create); 315 if (rc) 316 printf("Unable to update property %s:%s, err=%s\n", 317 path, prop, fdt_strerror(rc)); 318 } 319 320 void do_fixup_by_path_u32(void *fdt, const char *path, const char *prop, 321 u32 val, int create) 322 { 323 fdt32_t tmp = cpu_to_fdt32(val); 324 do_fixup_by_path(fdt, path, prop, &tmp, sizeof(tmp), create); 325 } 326 327 void do_fixup_by_prop(void *fdt, 328 const char *pname, const void *pval, int plen, 329 const char *prop, const void *val, int len, 330 int create) 331 { 332 int off; 333 #if defined(DEBUG) 334 int i; 335 debug("Updating property '%s' = ", prop); 336 for (i = 0; i < len; i++) 337 debug(" %.2x", *(u8*)(val+i)); 338 debug("\n"); 339 #endif 340 off = fdt_node_offset_by_prop_value(fdt, -1, pname, pval, plen); 341 while (off != -FDT_ERR_NOTFOUND) { 342 if (create || (fdt_get_property(fdt, off, prop, NULL) != NULL)) 343 fdt_setprop(fdt, off, prop, val, len); 344 off = fdt_node_offset_by_prop_value(fdt, off, pname, pval, plen); 345 } 346 } 347 348 void do_fixup_by_prop_u32(void *fdt, 349 const char *pname, const void *pval, int plen, 350 const char *prop, u32 val, int create) 351 { 352 fdt32_t tmp = cpu_to_fdt32(val); 353 do_fixup_by_prop(fdt, pname, pval, plen, prop, &tmp, 4, create); 354 } 355 356 void do_fixup_by_compat(void *fdt, const char *compat, 357 const char *prop, const void *val, int len, int create) 358 { 359 int off = -1; 360 #if defined(DEBUG) 361 int i; 362 debug("Updating property '%s' = ", prop); 363 for (i = 0; i < len; i++) 364 debug(" %.2x", *(u8*)(val+i)); 365 debug("\n"); 366 #endif 367 off = fdt_node_offset_by_compatible(fdt, -1, compat); 368 while (off != -FDT_ERR_NOTFOUND) { 369 if (create || (fdt_get_property(fdt, off, prop, NULL) != NULL)) 370 fdt_setprop(fdt, off, prop, val, len); 371 off = fdt_node_offset_by_compatible(fdt, off, compat); 372 } 373 } 374 375 void do_fixup_by_compat_u32(void *fdt, const char *compat, 376 const char *prop, u32 val, int create) 377 { 378 fdt32_t tmp = cpu_to_fdt32(val); 379 do_fixup_by_compat(fdt, compat, prop, &tmp, 4, create); 380 } 381 382 /* 383 * fdt_pack_reg - pack address and size array into the "reg"-suitable stream 384 */ 385 static int fdt_pack_reg(const void *fdt, void *buf, uint64_t *address, 386 uint64_t *size, int n) 387 { 388 int i; 389 int address_len = get_cells_len(fdt, "#address-cells"); 390 int size_len = get_cells_len(fdt, "#size-cells"); 391 char *p = buf; 392 393 for (i = 0; i < n; i++) { 394 if (address_len == 8) 395 *(fdt64_t *)p = cpu_to_fdt64(address[i]); 396 else 397 *(fdt32_t *)p = cpu_to_fdt32(address[i]); 398 p += address_len; 399 400 if (size_len == 8) 401 *(fdt64_t *)p = cpu_to_fdt64(size[i]); 402 else 403 *(fdt32_t *)p = cpu_to_fdt32(size[i]); 404 p += size_len; 405 } 406 407 return p - (char *)buf; 408 } 409 410 #ifdef CONFIG_NR_DRAM_BANKS 411 #define MEMORY_BANKS_MAX CONFIG_NR_DRAM_BANKS 412 #else 413 #define MEMORY_BANKS_MAX 4 414 #endif 415 int fdt_fixup_memory_banks(void *blob, u64 start[], u64 size[], int banks) 416 { 417 int err, nodeoffset; 418 int len; 419 u8 tmp[MEMORY_BANKS_MAX * 16]; /* Up to 64-bit address + 64-bit size */ 420 421 if (banks > MEMORY_BANKS_MAX) { 422 printf("%s: num banks %d exceeds hardcoded limit %d." 423 " Recompile with higher MEMORY_BANKS_MAX?\n", 424 __FUNCTION__, banks, MEMORY_BANKS_MAX); 425 return -1; 426 } 427 428 err = fdt_check_header(blob); 429 if (err < 0) { 430 printf("%s: %s\n", __FUNCTION__, fdt_strerror(err)); 431 return err; 432 } 433 434 /* find or create "/memory" node. */ 435 nodeoffset = fdt_find_or_add_subnode(blob, 0, "memory"); 436 if (nodeoffset < 0) 437 return nodeoffset; 438 439 err = fdt_setprop(blob, nodeoffset, "device_type", "memory", 440 sizeof("memory")); 441 if (err < 0) { 442 printf("WARNING: could not set %s %s.\n", "device_type", 443 fdt_strerror(err)); 444 return err; 445 } 446 447 len = fdt_pack_reg(blob, tmp, start, size, banks); 448 449 err = fdt_setprop(blob, nodeoffset, "reg", tmp, len); 450 if (err < 0) { 451 printf("WARNING: could not set %s %s.\n", 452 "reg", fdt_strerror(err)); 453 return err; 454 } 455 return 0; 456 } 457 458 int fdt_fixup_memory(void *blob, u64 start, u64 size) 459 { 460 return fdt_fixup_memory_banks(blob, &start, &size, 1); 461 } 462 463 void fdt_fixup_ethernet(void *fdt) 464 { 465 int node, i, j; 466 char enet[16], *tmp, *end; 467 char mac[16]; 468 const char *path; 469 unsigned char mac_addr[6]; 470 471 node = fdt_path_offset(fdt, "/aliases"); 472 if (node < 0) 473 return; 474 475 if (!getenv("ethaddr")) { 476 if (getenv("usbethaddr")) { 477 strcpy(mac, "usbethaddr"); 478 } else { 479 debug("No ethernet MAC Address defined\n"); 480 return; 481 } 482 } else { 483 strcpy(mac, "ethaddr"); 484 } 485 486 i = 0; 487 while ((tmp = getenv(mac)) != NULL) { 488 sprintf(enet, "ethernet%d", i); 489 path = fdt_getprop(fdt, node, enet, NULL); 490 if (!path) { 491 debug("No alias for %s\n", enet); 492 sprintf(mac, "eth%daddr", ++i); 493 continue; 494 } 495 496 for (j = 0; j < 6; j++) { 497 mac_addr[j] = tmp ? simple_strtoul(tmp, &end, 16) : 0; 498 if (tmp) 499 tmp = (*end) ? end+1 : end; 500 } 501 502 do_fixup_by_path(fdt, path, "mac-address", &mac_addr, 6, 0); 503 do_fixup_by_path(fdt, path, "local-mac-address", 504 &mac_addr, 6, 1); 505 506 sprintf(mac, "eth%daddr", ++i); 507 } 508 } 509 510 /* Resize the fdt to its actual size + a bit of padding */ 511 int fdt_shrink_to_minimum(void *blob) 512 { 513 int i; 514 uint64_t addr, size; 515 int total, ret; 516 uint actualsize; 517 518 if (!blob) 519 return 0; 520 521 total = fdt_num_mem_rsv(blob); 522 for (i = 0; i < total; i++) { 523 fdt_get_mem_rsv(blob, i, &addr, &size); 524 if (addr == (uintptr_t)blob) { 525 fdt_del_mem_rsv(blob, i); 526 break; 527 } 528 } 529 530 /* 531 * Calculate the actual size of the fdt 532 * plus the size needed for 5 fdt_add_mem_rsv, one 533 * for the fdt itself and 4 for a possible initrd 534 * ((initrd-start + initrd-end) * 2 (name & value)) 535 */ 536 actualsize = fdt_off_dt_strings(blob) + 537 fdt_size_dt_strings(blob) + 5 * sizeof(struct fdt_reserve_entry); 538 539 /* Make it so the fdt ends on a page boundary */ 540 actualsize = ALIGN(actualsize + ((uintptr_t)blob & 0xfff), 0x1000); 541 actualsize = actualsize - ((uintptr_t)blob & 0xfff); 542 543 /* Change the fdt header to reflect the correct size */ 544 fdt_set_totalsize(blob, actualsize); 545 546 /* Add the new reservation */ 547 ret = fdt_add_mem_rsv(blob, (uintptr_t)blob, actualsize); 548 if (ret < 0) 549 return ret; 550 551 return actualsize; 552 } 553 554 #ifdef CONFIG_PCI 555 #define CONFIG_SYS_PCI_NR_INBOUND_WIN 4 556 557 #define FDT_PCI_PREFETCH (0x40000000) 558 #define FDT_PCI_MEM32 (0x02000000) 559 #define FDT_PCI_IO (0x01000000) 560 #define FDT_PCI_MEM64 (0x03000000) 561 562 int fdt_pci_dma_ranges(void *blob, int phb_off, struct pci_controller *hose) { 563 564 int addrcell, sizecell, len, r; 565 u32 *dma_range; 566 /* sized based on pci addr cells, size-cells, & address-cells */ 567 u32 dma_ranges[(3 + 2 + 2) * CONFIG_SYS_PCI_NR_INBOUND_WIN]; 568 569 addrcell = fdt_getprop_u32_default(blob, "/", "#address-cells", 1); 570 sizecell = fdt_getprop_u32_default(blob, "/", "#size-cells", 1); 571 572 dma_range = &dma_ranges[0]; 573 for (r = 0; r < hose->region_count; r++) { 574 u64 bus_start, phys_start, size; 575 576 /* skip if !PCI_REGION_SYS_MEMORY */ 577 if (!(hose->regions[r].flags & PCI_REGION_SYS_MEMORY)) 578 continue; 579 580 bus_start = (u64)hose->regions[r].bus_start; 581 phys_start = (u64)hose->regions[r].phys_start; 582 size = (u64)hose->regions[r].size; 583 584 dma_range[0] = 0; 585 if (size >= 0x100000000ull) 586 dma_range[0] |= FDT_PCI_MEM64; 587 else 588 dma_range[0] |= FDT_PCI_MEM32; 589 if (hose->regions[r].flags & PCI_REGION_PREFETCH) 590 dma_range[0] |= FDT_PCI_PREFETCH; 591 #ifdef CONFIG_SYS_PCI_64BIT 592 dma_range[1] = bus_start >> 32; 593 #else 594 dma_range[1] = 0; 595 #endif 596 dma_range[2] = bus_start & 0xffffffff; 597 598 if (addrcell == 2) { 599 dma_range[3] = phys_start >> 32; 600 dma_range[4] = phys_start & 0xffffffff; 601 } else { 602 dma_range[3] = phys_start & 0xffffffff; 603 } 604 605 if (sizecell == 2) { 606 dma_range[3 + addrcell + 0] = size >> 32; 607 dma_range[3 + addrcell + 1] = size & 0xffffffff; 608 } else { 609 dma_range[3 + addrcell + 0] = size & 0xffffffff; 610 } 611 612 dma_range += (3 + addrcell + sizecell); 613 } 614 615 len = dma_range - &dma_ranges[0]; 616 if (len) 617 fdt_setprop(blob, phb_off, "dma-ranges", &dma_ranges[0], len*4); 618 619 return 0; 620 } 621 #endif 622 623 #ifdef CONFIG_FDT_FIXUP_NOR_FLASH_SIZE 624 /* 625 * Provide a weak default function to return the flash bank size. 626 * There might be multiple non-identical flash chips connected to one 627 * chip-select, so we need to pass an index as well. 628 */ 629 u32 __flash_get_bank_size(int cs, int idx) 630 { 631 extern flash_info_t flash_info[]; 632 633 /* 634 * As default, a simple 1:1 mapping is provided. Boards with 635 * a different mapping need to supply a board specific mapping 636 * routine. 637 */ 638 return flash_info[cs].size; 639 } 640 u32 flash_get_bank_size(int cs, int idx) 641 __attribute__((weak, alias("__flash_get_bank_size"))); 642 643 /* 644 * This function can be used to update the size in the "reg" property 645 * of all NOR FLASH device nodes. This is necessary for boards with 646 * non-fixed NOR FLASH sizes. 647 */ 648 int fdt_fixup_nor_flash_size(void *blob) 649 { 650 char compat[][16] = { "cfi-flash", "jedec-flash" }; 651 int off; 652 int len; 653 struct fdt_property *prop; 654 u32 *reg, *reg2; 655 int i; 656 657 for (i = 0; i < 2; i++) { 658 off = fdt_node_offset_by_compatible(blob, -1, compat[i]); 659 while (off != -FDT_ERR_NOTFOUND) { 660 int idx; 661 662 /* 663 * Found one compatible node, so fixup the size 664 * int its reg properties 665 */ 666 prop = fdt_get_property_w(blob, off, "reg", &len); 667 if (prop) { 668 int tuple_size = 3 * sizeof(reg); 669 670 /* 671 * There might be multiple reg-tuples, 672 * so loop through them all 673 */ 674 reg = reg2 = (u32 *)&prop->data[0]; 675 for (idx = 0; idx < (len / tuple_size); idx++) { 676 /* 677 * Update size in reg property 678 */ 679 reg[2] = flash_get_bank_size(reg[0], 680 idx); 681 682 /* 683 * Point to next reg tuple 684 */ 685 reg += 3; 686 } 687 688 fdt_setprop(blob, off, "reg", reg2, len); 689 } 690 691 /* Move to next compatible node */ 692 off = fdt_node_offset_by_compatible(blob, off, 693 compat[i]); 694 } 695 } 696 697 return 0; 698 } 699 #endif 700 701 int fdt_increase_size(void *fdt, int add_len) 702 { 703 int newlen; 704 705 newlen = fdt_totalsize(fdt) + add_len; 706 707 /* Open in place with a new len */ 708 return fdt_open_into(fdt, fdt, newlen); 709 } 710 711 #ifdef CONFIG_FDT_FIXUP_PARTITIONS 712 #include <jffs2/load_kernel.h> 713 #include <mtd_node.h> 714 715 struct reg_cell { 716 unsigned int r0; 717 unsigned int r1; 718 }; 719 720 int fdt_del_subnodes(const void *blob, int parent_offset) 721 { 722 int off, ndepth; 723 int ret; 724 725 for (ndepth = 0, off = fdt_next_node(blob, parent_offset, &ndepth); 726 (off >= 0) && (ndepth > 0); 727 off = fdt_next_node(blob, off, &ndepth)) { 728 if (ndepth == 1) { 729 debug("delete %s: offset: %x\n", 730 fdt_get_name(blob, off, 0), off); 731 ret = fdt_del_node((void *)blob, off); 732 if (ret < 0) { 733 printf("Can't delete node: %s\n", 734 fdt_strerror(ret)); 735 return ret; 736 } else { 737 ndepth = 0; 738 off = parent_offset; 739 } 740 } 741 } 742 return 0; 743 } 744 745 int fdt_del_partitions(void *blob, int parent_offset) 746 { 747 const void *prop; 748 int ndepth = 0; 749 int off; 750 int ret; 751 752 off = fdt_next_node(blob, parent_offset, &ndepth); 753 if (off > 0 && ndepth == 1) { 754 prop = fdt_getprop(blob, off, "label", NULL); 755 if (prop == NULL) { 756 /* 757 * Could not find label property, nand {}; node? 758 * Check subnode, delete partitions there if any. 759 */ 760 return fdt_del_partitions(blob, off); 761 } else { 762 ret = fdt_del_subnodes(blob, parent_offset); 763 if (ret < 0) { 764 printf("Can't remove subnodes: %s\n", 765 fdt_strerror(ret)); 766 return ret; 767 } 768 } 769 } 770 return 0; 771 } 772 773 int fdt_node_set_part_info(void *blob, int parent_offset, 774 struct mtd_device *dev) 775 { 776 struct list_head *pentry; 777 struct part_info *part; 778 struct reg_cell cell; 779 int off, ndepth = 0; 780 int part_num, ret; 781 char buf[64]; 782 783 ret = fdt_del_partitions(blob, parent_offset); 784 if (ret < 0) 785 return ret; 786 787 /* 788 * Check if it is nand {}; subnode, adjust 789 * the offset in this case 790 */ 791 off = fdt_next_node(blob, parent_offset, &ndepth); 792 if (off > 0 && ndepth == 1) 793 parent_offset = off; 794 795 part_num = 0; 796 list_for_each_prev(pentry, &dev->parts) { 797 int newoff; 798 799 part = list_entry(pentry, struct part_info, link); 800 801 debug("%2d: %-20s0x%08llx\t0x%08llx\t%d\n", 802 part_num, part->name, part->size, 803 part->offset, part->mask_flags); 804 805 sprintf(buf, "partition@%llx", part->offset); 806 add_sub: 807 ret = fdt_add_subnode(blob, parent_offset, buf); 808 if (ret == -FDT_ERR_NOSPACE) { 809 ret = fdt_increase_size(blob, 512); 810 if (!ret) 811 goto add_sub; 812 else 813 goto err_size; 814 } else if (ret < 0) { 815 printf("Can't add partition node: %s\n", 816 fdt_strerror(ret)); 817 return ret; 818 } 819 newoff = ret; 820 821 /* Check MTD_WRITEABLE_CMD flag */ 822 if (part->mask_flags & 1) { 823 add_ro: 824 ret = fdt_setprop(blob, newoff, "read_only", NULL, 0); 825 if (ret == -FDT_ERR_NOSPACE) { 826 ret = fdt_increase_size(blob, 512); 827 if (!ret) 828 goto add_ro; 829 else 830 goto err_size; 831 } else if (ret < 0) 832 goto err_prop; 833 } 834 835 cell.r0 = cpu_to_fdt32(part->offset); 836 cell.r1 = cpu_to_fdt32(part->size); 837 add_reg: 838 ret = fdt_setprop(blob, newoff, "reg", &cell, sizeof(cell)); 839 if (ret == -FDT_ERR_NOSPACE) { 840 ret = fdt_increase_size(blob, 512); 841 if (!ret) 842 goto add_reg; 843 else 844 goto err_size; 845 } else if (ret < 0) 846 goto err_prop; 847 848 add_label: 849 ret = fdt_setprop_string(blob, newoff, "label", part->name); 850 if (ret == -FDT_ERR_NOSPACE) { 851 ret = fdt_increase_size(blob, 512); 852 if (!ret) 853 goto add_label; 854 else 855 goto err_size; 856 } else if (ret < 0) 857 goto err_prop; 858 859 part_num++; 860 } 861 return 0; 862 err_size: 863 printf("Can't increase blob size: %s\n", fdt_strerror(ret)); 864 return ret; 865 err_prop: 866 printf("Can't add property: %s\n", fdt_strerror(ret)); 867 return ret; 868 } 869 870 /* 871 * Update partitions in nor/nand nodes using info from 872 * mtdparts environment variable. The nodes to update are 873 * specified by node_info structure which contains mtd device 874 * type and compatible string: E. g. the board code in 875 * ft_board_setup() could use: 876 * 877 * struct node_info nodes[] = { 878 * { "fsl,mpc5121-nfc", MTD_DEV_TYPE_NAND, }, 879 * { "cfi-flash", MTD_DEV_TYPE_NOR, }, 880 * }; 881 * 882 * fdt_fixup_mtdparts(blob, nodes, ARRAY_SIZE(nodes)); 883 */ 884 void fdt_fixup_mtdparts(void *blob, void *node_info, int node_info_size) 885 { 886 struct node_info *ni = node_info; 887 struct mtd_device *dev; 888 char *parts; 889 int i, idx; 890 int noff; 891 892 parts = getenv("mtdparts"); 893 if (!parts) 894 return; 895 896 if (mtdparts_init() != 0) 897 return; 898 899 for (i = 0; i < node_info_size; i++) { 900 idx = 0; 901 noff = fdt_node_offset_by_compatible(blob, -1, ni[i].compat); 902 while (noff != -FDT_ERR_NOTFOUND) { 903 debug("%s: %s, mtd dev type %d\n", 904 fdt_get_name(blob, noff, 0), 905 ni[i].compat, ni[i].type); 906 dev = device_find(ni[i].type, idx++); 907 if (dev) { 908 if (fdt_node_set_part_info(blob, noff, dev)) 909 return; /* return on error */ 910 } 911 912 /* Jump to next flash node */ 913 noff = fdt_node_offset_by_compatible(blob, noff, 914 ni[i].compat); 915 } 916 } 917 } 918 #endif 919 920 void fdt_del_node_and_alias(void *blob, const char *alias) 921 { 922 int off = fdt_path_offset(blob, alias); 923 924 if (off < 0) 925 return; 926 927 fdt_del_node(blob, off); 928 929 off = fdt_path_offset(blob, "/aliases"); 930 fdt_delprop(blob, off, alias); 931 } 932 933 #define PRu64 "%llx" 934 935 /* Max address size we deal with */ 936 #define OF_MAX_ADDR_CELLS 4 937 #define OF_BAD_ADDR ((u64)-1) 938 #define OF_CHECK_COUNTS(na, ns) ((na) > 0 && (na) <= OF_MAX_ADDR_CELLS && \ 939 (ns) > 0) 940 941 /* Debug utility */ 942 #ifdef DEBUG 943 static void of_dump_addr(const char *s, const fdt32_t *addr, int na) 944 { 945 printf("%s", s); 946 while(na--) 947 printf(" %08x", *(addr++)); 948 printf("\n"); 949 } 950 #else 951 static void of_dump_addr(const char *s, const fdt32_t *addr, int na) { } 952 #endif 953 954 /* Callbacks for bus specific translators */ 955 struct of_bus { 956 const char *name; 957 const char *addresses; 958 void (*count_cells)(void *blob, int parentoffset, 959 int *addrc, int *sizec); 960 u64 (*map)(fdt32_t *addr, const fdt32_t *range, 961 int na, int ns, int pna); 962 int (*translate)(fdt32_t *addr, u64 offset, int na); 963 }; 964 965 /* Default translator (generic bus) */ 966 void of_bus_default_count_cells(void *blob, int parentoffset, 967 int *addrc, int *sizec) 968 { 969 const fdt32_t *prop; 970 971 if (addrc) { 972 prop = fdt_getprop(blob, parentoffset, "#address-cells", NULL); 973 if (prop) 974 *addrc = be32_to_cpup(prop); 975 else 976 *addrc = 2; 977 } 978 979 if (sizec) { 980 prop = fdt_getprop(blob, parentoffset, "#size-cells", NULL); 981 if (prop) 982 *sizec = be32_to_cpup(prop); 983 else 984 *sizec = 1; 985 } 986 } 987 988 static u64 of_bus_default_map(fdt32_t *addr, const fdt32_t *range, 989 int na, int ns, int pna) 990 { 991 u64 cp, s, da; 992 993 cp = of_read_number(range, na); 994 s = of_read_number(range + na + pna, ns); 995 da = of_read_number(addr, na); 996 997 debug("OF: default map, cp="PRu64", s="PRu64", da="PRu64"\n", 998 cp, s, da); 999 1000 if (da < cp || da >= (cp + s)) 1001 return OF_BAD_ADDR; 1002 return da - cp; 1003 } 1004 1005 static int of_bus_default_translate(fdt32_t *addr, u64 offset, int na) 1006 { 1007 u64 a = of_read_number(addr, na); 1008 memset(addr, 0, na * 4); 1009 a += offset; 1010 if (na > 1) 1011 addr[na - 2] = cpu_to_fdt32(a >> 32); 1012 addr[na - 1] = cpu_to_fdt32(a & 0xffffffffu); 1013 1014 return 0; 1015 } 1016 1017 /* Array of bus specific translators */ 1018 static struct of_bus of_busses[] = { 1019 /* Default */ 1020 { 1021 .name = "default", 1022 .addresses = "reg", 1023 .count_cells = of_bus_default_count_cells, 1024 .map = of_bus_default_map, 1025 .translate = of_bus_default_translate, 1026 }, 1027 }; 1028 1029 static int of_translate_one(void * blob, int parent, struct of_bus *bus, 1030 struct of_bus *pbus, fdt32_t *addr, 1031 int na, int ns, int pna, const char *rprop) 1032 { 1033 const fdt32_t *ranges; 1034 int rlen; 1035 int rone; 1036 u64 offset = OF_BAD_ADDR; 1037 1038 /* Normally, an absence of a "ranges" property means we are 1039 * crossing a non-translatable boundary, and thus the addresses 1040 * below the current not cannot be converted to CPU physical ones. 1041 * Unfortunately, while this is very clear in the spec, it's not 1042 * what Apple understood, and they do have things like /uni-n or 1043 * /ht nodes with no "ranges" property and a lot of perfectly 1044 * useable mapped devices below them. Thus we treat the absence of 1045 * "ranges" as equivalent to an empty "ranges" property which means 1046 * a 1:1 translation at that level. It's up to the caller not to try 1047 * to translate addresses that aren't supposed to be translated in 1048 * the first place. --BenH. 1049 */ 1050 ranges = fdt_getprop(blob, parent, rprop, &rlen); 1051 if (ranges == NULL || rlen == 0) { 1052 offset = of_read_number(addr, na); 1053 memset(addr, 0, pna * 4); 1054 debug("OF: no ranges, 1:1 translation\n"); 1055 goto finish; 1056 } 1057 1058 debug("OF: walking ranges...\n"); 1059 1060 /* Now walk through the ranges */ 1061 rlen /= 4; 1062 rone = na + pna + ns; 1063 for (; rlen >= rone; rlen -= rone, ranges += rone) { 1064 offset = bus->map(addr, ranges, na, ns, pna); 1065 if (offset != OF_BAD_ADDR) 1066 break; 1067 } 1068 if (offset == OF_BAD_ADDR) { 1069 debug("OF: not found !\n"); 1070 return 1; 1071 } 1072 memcpy(addr, ranges + na, 4 * pna); 1073 1074 finish: 1075 of_dump_addr("OF: parent translation for:", addr, pna); 1076 debug("OF: with offset: "PRu64"\n", offset); 1077 1078 /* Translate it into parent bus space */ 1079 return pbus->translate(addr, offset, pna); 1080 } 1081 1082 /* 1083 * Translate an address from the device-tree into a CPU physical address, 1084 * this walks up the tree and applies the various bus mappings on the 1085 * way. 1086 * 1087 * Note: We consider that crossing any level with #size-cells == 0 to mean 1088 * that translation is impossible (that is we are not dealing with a value 1089 * that can be mapped to a cpu physical address). This is not really specified 1090 * that way, but this is traditionally the way IBM at least do things 1091 */ 1092 static u64 __of_translate_address(void *blob, int node_offset, const fdt32_t *in_addr, 1093 const char *rprop) 1094 { 1095 int parent; 1096 struct of_bus *bus, *pbus; 1097 fdt32_t addr[OF_MAX_ADDR_CELLS]; 1098 int na, ns, pna, pns; 1099 u64 result = OF_BAD_ADDR; 1100 1101 debug("OF: ** translation for device %s **\n", 1102 fdt_get_name(blob, node_offset, NULL)); 1103 1104 /* Get parent & match bus type */ 1105 parent = fdt_parent_offset(blob, node_offset); 1106 if (parent < 0) 1107 goto bail; 1108 bus = &of_busses[0]; 1109 1110 /* Cound address cells & copy address locally */ 1111 bus->count_cells(blob, parent, &na, &ns); 1112 if (!OF_CHECK_COUNTS(na, ns)) { 1113 printf("%s: Bad cell count for %s\n", __FUNCTION__, 1114 fdt_get_name(blob, node_offset, NULL)); 1115 goto bail; 1116 } 1117 memcpy(addr, in_addr, na * 4); 1118 1119 debug("OF: bus is %s (na=%d, ns=%d) on %s\n", 1120 bus->name, na, ns, fdt_get_name(blob, parent, NULL)); 1121 of_dump_addr("OF: translating address:", addr, na); 1122 1123 /* Translate */ 1124 for (;;) { 1125 /* Switch to parent bus */ 1126 node_offset = parent; 1127 parent = fdt_parent_offset(blob, node_offset); 1128 1129 /* If root, we have finished */ 1130 if (parent < 0) { 1131 debug("OF: reached root node\n"); 1132 result = of_read_number(addr, na); 1133 break; 1134 } 1135 1136 /* Get new parent bus and counts */ 1137 pbus = &of_busses[0]; 1138 pbus->count_cells(blob, parent, &pna, &pns); 1139 if (!OF_CHECK_COUNTS(pna, pns)) { 1140 printf("%s: Bad cell count for %s\n", __FUNCTION__, 1141 fdt_get_name(blob, node_offset, NULL)); 1142 break; 1143 } 1144 1145 debug("OF: parent bus is %s (na=%d, ns=%d) on %s\n", 1146 pbus->name, pna, pns, fdt_get_name(blob, parent, NULL)); 1147 1148 /* Apply bus translation */ 1149 if (of_translate_one(blob, node_offset, bus, pbus, 1150 addr, na, ns, pna, rprop)) 1151 break; 1152 1153 /* Complete the move up one level */ 1154 na = pna; 1155 ns = pns; 1156 bus = pbus; 1157 1158 of_dump_addr("OF: one level translation:", addr, na); 1159 } 1160 bail: 1161 1162 return result; 1163 } 1164 1165 u64 fdt_translate_address(void *blob, int node_offset, const fdt32_t *in_addr) 1166 { 1167 return __of_translate_address(blob, node_offset, in_addr, "ranges"); 1168 } 1169 1170 /** 1171 * fdt_node_offset_by_compat_reg: Find a node that matches compatiable and 1172 * who's reg property matches a physical cpu address 1173 * 1174 * @blob: ptr to device tree 1175 * @compat: compatiable string to match 1176 * @compat_off: property name 1177 * 1178 */ 1179 int fdt_node_offset_by_compat_reg(void *blob, const char *compat, 1180 phys_addr_t compat_off) 1181 { 1182 int len, off = fdt_node_offset_by_compatible(blob, -1, compat); 1183 while (off != -FDT_ERR_NOTFOUND) { 1184 const fdt32_t *reg = fdt_getprop(blob, off, "reg", &len); 1185 if (reg) { 1186 if (compat_off == fdt_translate_address(blob, off, reg)) 1187 return off; 1188 } 1189 off = fdt_node_offset_by_compatible(blob, off, compat); 1190 } 1191 1192 return -FDT_ERR_NOTFOUND; 1193 } 1194 1195 /** 1196 * fdt_alloc_phandle: Return next free phandle value 1197 * 1198 * @blob: ptr to device tree 1199 */ 1200 int fdt_alloc_phandle(void *blob) 1201 { 1202 int offset; 1203 uint32_t phandle = 0; 1204 1205 for (offset = fdt_next_node(blob, -1, NULL); offset >= 0; 1206 offset = fdt_next_node(blob, offset, NULL)) { 1207 phandle = max(phandle, fdt_get_phandle(blob, offset)); 1208 } 1209 1210 return phandle + 1; 1211 } 1212 1213 /* 1214 * fdt_set_phandle: Create a phandle property for the given node 1215 * 1216 * @fdt: ptr to device tree 1217 * @nodeoffset: node to update 1218 * @phandle: phandle value to set (must be unique) 1219 */ 1220 int fdt_set_phandle(void *fdt, int nodeoffset, uint32_t phandle) 1221 { 1222 int ret; 1223 1224 #ifdef DEBUG 1225 int off = fdt_node_offset_by_phandle(fdt, phandle); 1226 1227 if ((off >= 0) && (off != nodeoffset)) { 1228 char buf[64]; 1229 1230 fdt_get_path(fdt, nodeoffset, buf, sizeof(buf)); 1231 printf("Trying to update node %s with phandle %u ", 1232 buf, phandle); 1233 1234 fdt_get_path(fdt, off, buf, sizeof(buf)); 1235 printf("that already exists in node %s.\n", buf); 1236 return -FDT_ERR_BADPHANDLE; 1237 } 1238 #endif 1239 1240 ret = fdt_setprop_cell(fdt, nodeoffset, "phandle", phandle); 1241 if (ret < 0) 1242 return ret; 1243 1244 /* 1245 * For now, also set the deprecated "linux,phandle" property, so that we 1246 * don't break older kernels. 1247 */ 1248 ret = fdt_setprop_cell(fdt, nodeoffset, "linux,phandle", phandle); 1249 1250 return ret; 1251 } 1252 1253 /* 1254 * fdt_create_phandle: Create a phandle property for the given node 1255 * 1256 * @fdt: ptr to device tree 1257 * @nodeoffset: node to update 1258 */ 1259 unsigned int fdt_create_phandle(void *fdt, int nodeoffset) 1260 { 1261 /* see if there is a phandle already */ 1262 int phandle = fdt_get_phandle(fdt, nodeoffset); 1263 1264 /* if we got 0, means no phandle so create one */ 1265 if (phandle == 0) { 1266 int ret; 1267 1268 phandle = fdt_alloc_phandle(fdt); 1269 ret = fdt_set_phandle(fdt, nodeoffset, phandle); 1270 if (ret < 0) { 1271 printf("Can't set phandle %u: %s\n", phandle, 1272 fdt_strerror(ret)); 1273 return 0; 1274 } 1275 } 1276 1277 return phandle; 1278 } 1279 1280 /* 1281 * fdt_set_node_status: Set status for the given node 1282 * 1283 * @fdt: ptr to device tree 1284 * @nodeoffset: node to update 1285 * @status: FDT_STATUS_OKAY, FDT_STATUS_DISABLED, 1286 * FDT_STATUS_FAIL, FDT_STATUS_FAIL_ERROR_CODE 1287 * @error_code: optional, only used if status is FDT_STATUS_FAIL_ERROR_CODE 1288 */ 1289 int fdt_set_node_status(void *fdt, int nodeoffset, 1290 enum fdt_status status, unsigned int error_code) 1291 { 1292 char buf[16]; 1293 int ret = 0; 1294 1295 if (nodeoffset < 0) 1296 return nodeoffset; 1297 1298 switch (status) { 1299 case FDT_STATUS_OKAY: 1300 ret = fdt_setprop_string(fdt, nodeoffset, "status", "okay"); 1301 break; 1302 case FDT_STATUS_DISABLED: 1303 ret = fdt_setprop_string(fdt, nodeoffset, "status", "disabled"); 1304 break; 1305 case FDT_STATUS_FAIL: 1306 ret = fdt_setprop_string(fdt, nodeoffset, "status", "fail"); 1307 break; 1308 case FDT_STATUS_FAIL_ERROR_CODE: 1309 sprintf(buf, "fail-%d", error_code); 1310 ret = fdt_setprop_string(fdt, nodeoffset, "status", buf); 1311 break; 1312 default: 1313 printf("Invalid fdt status: %x\n", status); 1314 ret = -1; 1315 break; 1316 } 1317 1318 return ret; 1319 } 1320 1321 /* 1322 * fdt_set_status_by_alias: Set status for the given node given an alias 1323 * 1324 * @fdt: ptr to device tree 1325 * @alias: alias of node to update 1326 * @status: FDT_STATUS_OKAY, FDT_STATUS_DISABLED, 1327 * FDT_STATUS_FAIL, FDT_STATUS_FAIL_ERROR_CODE 1328 * @error_code: optional, only used if status is FDT_STATUS_FAIL_ERROR_CODE 1329 */ 1330 int fdt_set_status_by_alias(void *fdt, const char* alias, 1331 enum fdt_status status, unsigned int error_code) 1332 { 1333 int offset = fdt_path_offset(fdt, alias); 1334 1335 return fdt_set_node_status(fdt, offset, status, error_code); 1336 } 1337 1338 #if defined(CONFIG_VIDEO) || defined(CONFIG_LCD) 1339 int fdt_add_edid(void *blob, const char *compat, unsigned char *edid_buf) 1340 { 1341 int noff; 1342 int ret; 1343 1344 noff = fdt_node_offset_by_compatible(blob, -1, compat); 1345 if (noff != -FDT_ERR_NOTFOUND) { 1346 debug("%s: %s\n", fdt_get_name(blob, noff, 0), compat); 1347 add_edid: 1348 ret = fdt_setprop(blob, noff, "edid", edid_buf, 128); 1349 if (ret == -FDT_ERR_NOSPACE) { 1350 ret = fdt_increase_size(blob, 512); 1351 if (!ret) 1352 goto add_edid; 1353 else 1354 goto err_size; 1355 } else if (ret < 0) { 1356 printf("Can't add property: %s\n", fdt_strerror(ret)); 1357 return ret; 1358 } 1359 } 1360 return 0; 1361 err_size: 1362 printf("Can't increase blob size: %s\n", fdt_strerror(ret)); 1363 return ret; 1364 } 1365 #endif 1366 1367 /* 1368 * Verify the physical address of device tree node for a given alias 1369 * 1370 * This function locates the device tree node of a given alias, and then 1371 * verifies that the physical address of that device matches the given 1372 * parameter. It displays a message if there is a mismatch. 1373 * 1374 * Returns 1 on success, 0 on failure 1375 */ 1376 int fdt_verify_alias_address(void *fdt, int anode, const char *alias, u64 addr) 1377 { 1378 const char *path; 1379 const fdt32_t *reg; 1380 int node, len; 1381 u64 dt_addr; 1382 1383 path = fdt_getprop(fdt, anode, alias, NULL); 1384 if (!path) { 1385 /* If there's no such alias, then it's not a failure */ 1386 return 1; 1387 } 1388 1389 node = fdt_path_offset(fdt, path); 1390 if (node < 0) { 1391 printf("Warning: device tree alias '%s' points to invalid " 1392 "node %s.\n", alias, path); 1393 return 0; 1394 } 1395 1396 reg = fdt_getprop(fdt, node, "reg", &len); 1397 if (!reg) { 1398 printf("Warning: device tree node '%s' has no address.\n", 1399 path); 1400 return 0; 1401 } 1402 1403 dt_addr = fdt_translate_address(fdt, node, reg); 1404 if (addr != dt_addr) { 1405 printf("Warning: U-Boot configured device %s at address %llx,\n" 1406 " but the device tree has it address %llx.\n", 1407 alias, addr, dt_addr); 1408 return 0; 1409 } 1410 1411 return 1; 1412 } 1413 1414 /* 1415 * Returns the base address of an SOC or PCI node 1416 */ 1417 u64 fdt_get_base_address(void *fdt, int node) 1418 { 1419 int size; 1420 u32 naddr; 1421 const fdt32_t *prop; 1422 1423 prop = fdt_getprop(fdt, node, "#address-cells", &size); 1424 if (prop && size == 4) 1425 naddr = be32_to_cpup(prop); 1426 else 1427 naddr = 2; 1428 1429 prop = fdt_getprop(fdt, node, "ranges", &size); 1430 1431 return prop ? fdt_translate_address(fdt, node, prop + naddr) : 0; 1432 } 1433 1434 /* 1435 * Read a property of size <prop_len>. Currently only supports 1 or 2 cells. 1436 */ 1437 static int fdt_read_prop(const fdt32_t *prop, int prop_len, int cell_off, 1438 uint64_t *val, int cells) 1439 { 1440 const fdt32_t *prop32 = &prop[cell_off]; 1441 const fdt64_t *prop64 = (const fdt64_t *)&prop[cell_off]; 1442 1443 if ((cell_off + cells) > prop_len) 1444 return -FDT_ERR_NOSPACE; 1445 1446 switch (cells) { 1447 case 1: 1448 *val = fdt32_to_cpu(*prop32); 1449 break; 1450 case 2: 1451 *val = fdt64_to_cpu(*prop64); 1452 break; 1453 default: 1454 return -FDT_ERR_NOSPACE; 1455 } 1456 1457 return 0; 1458 } 1459 1460 /** 1461 * fdt_read_range - Read a node's n'th range property 1462 * 1463 * @fdt: ptr to device tree 1464 * @node: offset of node 1465 * @n: range index 1466 * @child_addr: pointer to storage for the "child address" field 1467 * @addr: pointer to storage for the CPU view translated physical start 1468 * @len: pointer to storage for the range length 1469 * 1470 * Convenience function that reads and interprets a specific range out of 1471 * a number of the "ranges" property array. 1472 */ 1473 int fdt_read_range(void *fdt, int node, int n, uint64_t *child_addr, 1474 uint64_t *addr, uint64_t *len) 1475 { 1476 int pnode = fdt_parent_offset(fdt, node); 1477 const fdt32_t *ranges; 1478 int pacells; 1479 int acells; 1480 int scells; 1481 int ranges_len; 1482 int cell = 0; 1483 int r = 0; 1484 1485 /* 1486 * The "ranges" property is an array of 1487 * { <child address> <parent address> <size in child address space> } 1488 * 1489 * All 3 elements can span a diffent number of cells. Fetch their size. 1490 */ 1491 pacells = fdt_getprop_u32_default_node(fdt, pnode, 0, "#address-cells", 1); 1492 acells = fdt_getprop_u32_default_node(fdt, node, 0, "#address-cells", 1); 1493 scells = fdt_getprop_u32_default_node(fdt, node, 0, "#size-cells", 1); 1494 1495 /* Now try to get the ranges property */ 1496 ranges = fdt_getprop(fdt, node, "ranges", &ranges_len); 1497 if (!ranges) 1498 return -FDT_ERR_NOTFOUND; 1499 ranges_len /= sizeof(uint32_t); 1500 1501 /* Jump to the n'th entry */ 1502 cell = n * (pacells + acells + scells); 1503 1504 /* Read <child address> */ 1505 if (child_addr) { 1506 r = fdt_read_prop(ranges, ranges_len, cell, child_addr, 1507 acells); 1508 if (r) 1509 return r; 1510 } 1511 cell += acells; 1512 1513 /* Read <parent address> */ 1514 if (addr) 1515 *addr = fdt_translate_address(fdt, node, ranges + cell); 1516 cell += pacells; 1517 1518 /* Read <size in child address space> */ 1519 if (len) { 1520 r = fdt_read_prop(ranges, ranges_len, cell, len, scells); 1521 if (r) 1522 return r; 1523 } 1524 1525 return 0; 1526 } 1527