1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * (C) Copyright 2007 4 * Gerald Van Baren, Custom IDEAS, vanbaren@cideas.com 5 * 6 * Copyright 2010-2011 Freescale Semiconductor, Inc. 7 */ 8 9 #include <common.h> 10 #include <stdio_dev.h> 11 #include <linux/ctype.h> 12 #include <linux/types.h> 13 #include <asm/global_data.h> 14 #include <linux/libfdt.h> 15 #include <fdt_support.h> 16 #include <exports.h> 17 #include <fdtdec.h> 18 19 /** 20 * fdt_getprop_u32_default_node - Return a node's property or a default 21 * 22 * @fdt: ptr to device tree 23 * @off: offset of node 24 * @cell: cell offset in property 25 * @prop: property name 26 * @dflt: default value if the property isn't found 27 * 28 * Convenience function to return a node's property or a default value if 29 * the property doesn't exist. 30 */ 31 u32 fdt_getprop_u32_default_node(const void *fdt, int off, int cell, 32 const char *prop, const u32 dflt) 33 { 34 const fdt32_t *val; 35 int len; 36 37 val = fdt_getprop(fdt, off, prop, &len); 38 39 /* Check if property exists */ 40 if (!val) 41 return dflt; 42 43 /* Check if property is long enough */ 44 if (len < ((cell + 1) * sizeof(uint32_t))) 45 return dflt; 46 47 return fdt32_to_cpu(*val); 48 } 49 50 /** 51 * fdt_getprop_u32_default - Find a node and return it's property or a default 52 * 53 * @fdt: ptr to device tree 54 * @path: path of node 55 * @prop: property name 56 * @dflt: default value if the property isn't found 57 * 58 * Convenience function to find a node and return it's property or a 59 * default value if it doesn't exist. 60 */ 61 u32 fdt_getprop_u32_default(const void *fdt, const char *path, 62 const char *prop, const u32 dflt) 63 { 64 int off; 65 66 off = fdt_path_offset(fdt, path); 67 if (off < 0) 68 return dflt; 69 70 return fdt_getprop_u32_default_node(fdt, off, 0, prop, dflt); 71 } 72 73 /** 74 * fdt_find_and_setprop: Find a node and set it's property 75 * 76 * @fdt: ptr to device tree 77 * @node: path of node 78 * @prop: property name 79 * @val: ptr to new value 80 * @len: length of new property value 81 * @create: flag to create the property if it doesn't exist 82 * 83 * Convenience function to directly set a property given the path to the node. 84 */ 85 int fdt_find_and_setprop(void *fdt, const char *node, const char *prop, 86 const void *val, int len, int create) 87 { 88 int nodeoff = fdt_path_offset(fdt, node); 89 90 if (nodeoff < 0) 91 return nodeoff; 92 93 if ((!create) && (fdt_get_property(fdt, nodeoff, prop, NULL) == NULL)) 94 return 0; /* create flag not set; so exit quietly */ 95 96 return fdt_setprop(fdt, nodeoff, prop, val, len); 97 } 98 99 /** 100 * fdt_find_or_add_subnode() - find or possibly add a subnode of a given node 101 * 102 * @fdt: pointer to the device tree blob 103 * @parentoffset: structure block offset of a node 104 * @name: name of the subnode to locate 105 * 106 * fdt_subnode_offset() finds a subnode of the node with a given name. 107 * If the subnode does not exist, it will be created. 108 */ 109 int fdt_find_or_add_subnode(void *fdt, int parentoffset, const char *name) 110 { 111 int offset; 112 113 offset = fdt_subnode_offset(fdt, parentoffset, name); 114 115 if (offset == -FDT_ERR_NOTFOUND) 116 offset = fdt_add_subnode(fdt, parentoffset, name); 117 118 if (offset < 0) 119 printf("%s: %s: %s\n", __func__, name, fdt_strerror(offset)); 120 121 return offset; 122 } 123 124 /* rename to CONFIG_OF_STDOUT_PATH ? */ 125 #if defined(OF_STDOUT_PATH) 126 static int fdt_fixup_stdout(void *fdt, int chosenoff) 127 { 128 return fdt_setprop(fdt, chosenoff, "linux,stdout-path", 129 OF_STDOUT_PATH, strlen(OF_STDOUT_PATH) + 1); 130 } 131 #elif defined(CONFIG_OF_STDOUT_VIA_ALIAS) && defined(CONFIG_CONS_INDEX) 132 static int fdt_fixup_stdout(void *fdt, int chosenoff) 133 { 134 int err; 135 int aliasoff; 136 char sername[9] = { 0 }; 137 const void *path; 138 int len; 139 char tmp[256]; /* long enough */ 140 141 sprintf(sername, "serial%d", CONFIG_CONS_INDEX - 1); 142 143 aliasoff = fdt_path_offset(fdt, "/aliases"); 144 if (aliasoff < 0) { 145 err = aliasoff; 146 goto noalias; 147 } 148 149 path = fdt_getprop(fdt, aliasoff, sername, &len); 150 if (!path) { 151 err = len; 152 goto noalias; 153 } 154 155 /* fdt_setprop may break "path" so we copy it to tmp buffer */ 156 memcpy(tmp, path, len); 157 158 err = fdt_setprop(fdt, chosenoff, "linux,stdout-path", tmp, len); 159 if (err < 0) 160 printf("WARNING: could not set linux,stdout-path %s.\n", 161 fdt_strerror(err)); 162 163 return err; 164 165 noalias: 166 printf("WARNING: %s: could not read %s alias: %s\n", 167 __func__, sername, fdt_strerror(err)); 168 169 return 0; 170 } 171 #else 172 static int fdt_fixup_stdout(void *fdt, int chosenoff) 173 { 174 return 0; 175 } 176 #endif 177 178 static inline int fdt_setprop_uxx(void *fdt, int nodeoffset, const char *name, 179 uint64_t val, int is_u64) 180 { 181 if (is_u64) 182 return fdt_setprop_u64(fdt, nodeoffset, name, val); 183 else 184 return fdt_setprop_u32(fdt, nodeoffset, name, (uint32_t)val); 185 } 186 187 int fdt_root(void *fdt) 188 { 189 char *serial; 190 int err; 191 192 err = fdt_check_header(fdt); 193 if (err < 0) { 194 printf("fdt_root: %s\n", fdt_strerror(err)); 195 return err; 196 } 197 198 serial = env_get("serial#"); 199 if (serial) { 200 err = fdt_setprop(fdt, 0, "serial-number", serial, 201 strlen(serial) + 1); 202 203 if (err < 0) { 204 printf("WARNING: could not set serial-number %s.\n", 205 fdt_strerror(err)); 206 return err; 207 } 208 } 209 210 return 0; 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 = (fdt_address_cells(fdt, 0) == 2); 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 = env_get("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 #ifdef CONFIG_ARCH_FIXUP_FDT_MEMORY 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, u64 *address, u64 *size, 387 int n) 388 { 389 int i; 390 int address_cells = fdt_address_cells(fdt, 0); 391 int size_cells = fdt_size_cells(fdt, 0); 392 char *p = buf; 393 394 for (i = 0; i < n; i++) { 395 if (address_cells == 2) 396 *(fdt64_t *)p = cpu_to_fdt64(address[i]); 397 else 398 *(fdt32_t *)p = cpu_to_fdt32(address[i]); 399 p += 4 * address_cells; 400 401 if (size_cells == 2) 402 *(fdt64_t *)p = cpu_to_fdt64(size[i]); 403 else 404 *(fdt32_t *)p = cpu_to_fdt32(size[i]); 405 p += 4 * size_cells; 406 } 407 408 return p - (char *)buf; 409 } 410 411 #if CONFIG_NR_DRAM_BANKS > 4 412 #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, i; 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 for (i = 0; i < banks; i++) { 449 if (start[i] == 0 && size[i] == 0) 450 break; 451 } 452 453 banks = i; 454 455 if (!banks) 456 return 0; 457 458 for (i = 0; i < banks; i++) 459 if (start[i] == 0 && size[i] == 0) 460 break; 461 462 banks = i; 463 464 len = fdt_pack_reg(blob, tmp, start, size, banks); 465 466 err = fdt_setprop(blob, nodeoffset, "reg", tmp, len); 467 if (err < 0) { 468 printf("WARNING: could not set %s %s.\n", 469 "reg", fdt_strerror(err)); 470 return err; 471 } 472 return 0; 473 } 474 #endif 475 476 int fdt_fixup_memory(void *blob, u64 start, u64 size) 477 { 478 return fdt_fixup_memory_banks(blob, &start, &size, 1); 479 } 480 481 void fdt_fixup_ethernet(void *fdt) 482 { 483 int i = 0, j, prop; 484 char *tmp, *end; 485 char mac[16]; 486 const char *path; 487 unsigned char mac_addr[ARP_HLEN]; 488 int offset; 489 #ifdef FDT_SEQ_MACADDR_FROM_ENV 490 int nodeoff; 491 const struct fdt_property *fdt_prop; 492 #endif 493 494 if (fdt_path_offset(fdt, "/aliases") < 0) 495 return; 496 497 /* Cycle through all aliases */ 498 for (prop = 0; ; prop++) { 499 const char *name; 500 501 /* FDT might have been edited, recompute the offset */ 502 offset = fdt_first_property_offset(fdt, 503 fdt_path_offset(fdt, "/aliases")); 504 /* Select property number 'prop' */ 505 for (j = 0; j < prop; j++) 506 offset = fdt_next_property_offset(fdt, offset); 507 508 if (offset < 0) 509 break; 510 511 path = fdt_getprop_by_offset(fdt, offset, &name, NULL); 512 if (!strncmp(name, "ethernet", 8)) { 513 /* Treat plain "ethernet" same as "ethernet0". */ 514 if (!strcmp(name, "ethernet") 515 #ifdef FDT_SEQ_MACADDR_FROM_ENV 516 || !strcmp(name, "ethernet0") 517 #endif 518 ) 519 i = 0; 520 #ifndef FDT_SEQ_MACADDR_FROM_ENV 521 else 522 i = trailing_strtol(name); 523 #endif 524 if (i != -1) { 525 if (i == 0) 526 strcpy(mac, "ethaddr"); 527 else 528 sprintf(mac, "eth%daddr", i); 529 } else { 530 continue; 531 } 532 #ifdef FDT_SEQ_MACADDR_FROM_ENV 533 nodeoff = fdt_path_offset(fdt, path); 534 fdt_prop = fdt_get_property(fdt, nodeoff, "status", 535 NULL); 536 if (fdt_prop && !strcmp(fdt_prop->data, "disabled")) 537 continue; 538 i++; 539 #endif 540 tmp = env_get(mac); 541 if (!tmp) 542 continue; 543 544 for (j = 0; j < 6; j++) { 545 mac_addr[j] = tmp ? 546 simple_strtoul(tmp, &end, 16) : 0; 547 if (tmp) 548 tmp = (*end) ? end + 1 : end; 549 } 550 551 do_fixup_by_path(fdt, path, "mac-address", 552 &mac_addr, 6, 0); 553 do_fixup_by_path(fdt, path, "local-mac-address", 554 &mac_addr, 6, 1); 555 } 556 } 557 } 558 559 int fdt_record_loadable(void *blob, u32 index, const char *name, 560 uintptr_t load_addr, u32 size, uintptr_t entry_point, 561 const char *type, const char *os) 562 { 563 int err, node; 564 565 err = fdt_check_header(blob); 566 if (err < 0) { 567 printf("%s: %s\n", __func__, fdt_strerror(err)); 568 return err; 569 } 570 571 /* find or create "/fit-images" node */ 572 node = fdt_find_or_add_subnode(blob, 0, "fit-images"); 573 if (node < 0) 574 return node; 575 576 /* find or create "/fit-images/<name>" node */ 577 node = fdt_find_or_add_subnode(blob, node, name); 578 if (node < 0) 579 return node; 580 581 /* 582 * We record these as 32bit entities, possibly truncating addresses. 583 * However, spl_fit.c is not 64bit safe either: i.e. we should not 584 * have an issue here. 585 */ 586 fdt_setprop_u32(blob, node, "load-addr", load_addr); 587 if (entry_point != -1) 588 fdt_setprop_u32(blob, node, "entry-point", entry_point); 589 fdt_setprop_u32(blob, node, "size", size); 590 if (type) 591 fdt_setprop_string(blob, node, "type", type); 592 if (os) 593 fdt_setprop_string(blob, node, "os", os); 594 595 return node; 596 } 597 598 /* Resize the fdt to its actual size + a bit of padding */ 599 int fdt_shrink_to_minimum(void *blob, uint extrasize) 600 { 601 int i; 602 uint64_t addr, size; 603 int total, ret; 604 uint actualsize; 605 606 if (!blob) 607 return 0; 608 609 total = fdt_num_mem_rsv(blob); 610 for (i = 0; i < total; i++) { 611 fdt_get_mem_rsv(blob, i, &addr, &size); 612 if (addr == (uintptr_t)blob) { 613 fdt_del_mem_rsv(blob, i); 614 break; 615 } 616 } 617 618 /* 619 * Calculate the actual size of the fdt 620 * plus the size needed for 5 fdt_add_mem_rsv, one 621 * for the fdt itself and 4 for a possible initrd 622 * ((initrd-start + initrd-end) * 2 (name & value)) 623 */ 624 actualsize = fdt_off_dt_strings(blob) + 625 fdt_size_dt_strings(blob) + 5 * sizeof(struct fdt_reserve_entry); 626 627 actualsize += extrasize; 628 /* Make it so the fdt ends on a page boundary */ 629 actualsize = ALIGN(actualsize + ((uintptr_t)blob & 0xfff), 0x1000); 630 actualsize = actualsize - ((uintptr_t)blob & 0xfff); 631 632 /* Change the fdt header to reflect the correct size */ 633 fdt_set_totalsize(blob, actualsize); 634 635 /* Add the new reservation */ 636 ret = fdt_add_mem_rsv(blob, (uintptr_t)blob, actualsize); 637 if (ret < 0) 638 return ret; 639 640 return actualsize; 641 } 642 643 #ifdef CONFIG_PCI 644 #define CONFIG_SYS_PCI_NR_INBOUND_WIN 4 645 646 #define FDT_PCI_PREFETCH (0x40000000) 647 #define FDT_PCI_MEM32 (0x02000000) 648 #define FDT_PCI_IO (0x01000000) 649 #define FDT_PCI_MEM64 (0x03000000) 650 651 int fdt_pci_dma_ranges(void *blob, int phb_off, struct pci_controller *hose) { 652 653 int addrcell, sizecell, len, r; 654 u32 *dma_range; 655 /* sized based on pci addr cells, size-cells, & address-cells */ 656 u32 dma_ranges[(3 + 2 + 2) * CONFIG_SYS_PCI_NR_INBOUND_WIN]; 657 658 addrcell = fdt_getprop_u32_default(blob, "/", "#address-cells", 1); 659 sizecell = fdt_getprop_u32_default(blob, "/", "#size-cells", 1); 660 661 dma_range = &dma_ranges[0]; 662 for (r = 0; r < hose->region_count; r++) { 663 u64 bus_start, phys_start, size; 664 665 /* skip if !PCI_REGION_SYS_MEMORY */ 666 if (!(hose->regions[r].flags & PCI_REGION_SYS_MEMORY)) 667 continue; 668 669 bus_start = (u64)hose->regions[r].bus_start; 670 phys_start = (u64)hose->regions[r].phys_start; 671 size = (u64)hose->regions[r].size; 672 673 dma_range[0] = 0; 674 if (size >= 0x100000000ull) 675 dma_range[0] |= FDT_PCI_MEM64; 676 else 677 dma_range[0] |= FDT_PCI_MEM32; 678 if (hose->regions[r].flags & PCI_REGION_PREFETCH) 679 dma_range[0] |= FDT_PCI_PREFETCH; 680 #ifdef CONFIG_SYS_PCI_64BIT 681 dma_range[1] = bus_start >> 32; 682 #else 683 dma_range[1] = 0; 684 #endif 685 dma_range[2] = bus_start & 0xffffffff; 686 687 if (addrcell == 2) { 688 dma_range[3] = phys_start >> 32; 689 dma_range[4] = phys_start & 0xffffffff; 690 } else { 691 dma_range[3] = phys_start & 0xffffffff; 692 } 693 694 if (sizecell == 2) { 695 dma_range[3 + addrcell + 0] = size >> 32; 696 dma_range[3 + addrcell + 1] = size & 0xffffffff; 697 } else { 698 dma_range[3 + addrcell + 0] = size & 0xffffffff; 699 } 700 701 dma_range += (3 + addrcell + sizecell); 702 } 703 704 len = dma_range - &dma_ranges[0]; 705 if (len) 706 fdt_setprop(blob, phb_off, "dma-ranges", &dma_ranges[0], len*4); 707 708 return 0; 709 } 710 #endif 711 712 int fdt_increase_size(void *fdt, int add_len) 713 { 714 int newlen; 715 716 newlen = fdt_totalsize(fdt) + add_len; 717 718 /* Open in place with a new len */ 719 return fdt_open_into(fdt, fdt, newlen); 720 } 721 722 #ifdef CONFIG_FDT_FIXUP_PARTITIONS 723 #include <jffs2/load_kernel.h> 724 #include <mtd_node.h> 725 726 struct reg_cell { 727 unsigned int r0; 728 unsigned int r1; 729 }; 730 731 static int fdt_del_subnodes(const void *blob, int parent_offset) 732 { 733 int off, ndepth; 734 int ret; 735 736 for (ndepth = 0, off = fdt_next_node(blob, parent_offset, &ndepth); 737 (off >= 0) && (ndepth > 0); 738 off = fdt_next_node(blob, off, &ndepth)) { 739 if (ndepth == 1) { 740 debug("delete %s: offset: %x\n", 741 fdt_get_name(blob, off, 0), off); 742 ret = fdt_del_node((void *)blob, off); 743 if (ret < 0) { 744 printf("Can't delete node: %s\n", 745 fdt_strerror(ret)); 746 return ret; 747 } else { 748 ndepth = 0; 749 off = parent_offset; 750 } 751 } 752 } 753 return 0; 754 } 755 756 static int fdt_del_partitions(void *blob, int parent_offset) 757 { 758 const void *prop; 759 int ndepth = 0; 760 int off; 761 int ret; 762 763 off = fdt_next_node(blob, parent_offset, &ndepth); 764 if (off > 0 && ndepth == 1) { 765 prop = fdt_getprop(blob, off, "label", NULL); 766 if (prop == NULL) { 767 /* 768 * Could not find label property, nand {}; node? 769 * Check subnode, delete partitions there if any. 770 */ 771 return fdt_del_partitions(blob, off); 772 } else { 773 ret = fdt_del_subnodes(blob, parent_offset); 774 if (ret < 0) { 775 printf("Can't remove subnodes: %s\n", 776 fdt_strerror(ret)); 777 return ret; 778 } 779 } 780 } 781 return 0; 782 } 783 784 int fdt_node_set_part_info(void *blob, int parent_offset, 785 struct mtd_device *dev) 786 { 787 struct list_head *pentry; 788 struct part_info *part; 789 struct reg_cell cell; 790 int off, ndepth = 0; 791 int part_num, ret; 792 char buf[64]; 793 794 ret = fdt_del_partitions(blob, parent_offset); 795 if (ret < 0) 796 return ret; 797 798 /* 799 * Check if it is nand {}; subnode, adjust 800 * the offset in this case 801 */ 802 off = fdt_next_node(blob, parent_offset, &ndepth); 803 if (off > 0 && ndepth == 1) 804 parent_offset = off; 805 806 part_num = 0; 807 list_for_each_prev(pentry, &dev->parts) { 808 int newoff; 809 810 part = list_entry(pentry, struct part_info, link); 811 812 debug("%2d: %-20s0x%08llx\t0x%08llx\t%d\n", 813 part_num, part->name, part->size, 814 part->offset, part->mask_flags); 815 816 sprintf(buf, "partition@%llx", part->offset); 817 add_sub: 818 ret = fdt_add_subnode(blob, parent_offset, buf); 819 if (ret == -FDT_ERR_NOSPACE) { 820 ret = fdt_increase_size(blob, 512); 821 if (!ret) 822 goto add_sub; 823 else 824 goto err_size; 825 } else if (ret < 0) { 826 printf("Can't add partition node: %s\n", 827 fdt_strerror(ret)); 828 return ret; 829 } 830 newoff = ret; 831 832 /* Check MTD_WRITEABLE_CMD flag */ 833 if (part->mask_flags & 1) { 834 add_ro: 835 ret = fdt_setprop(blob, newoff, "read_only", NULL, 0); 836 if (ret == -FDT_ERR_NOSPACE) { 837 ret = fdt_increase_size(blob, 512); 838 if (!ret) 839 goto add_ro; 840 else 841 goto err_size; 842 } else if (ret < 0) 843 goto err_prop; 844 } 845 846 cell.r0 = cpu_to_fdt32(part->offset); 847 cell.r1 = cpu_to_fdt32(part->size); 848 add_reg: 849 ret = fdt_setprop(blob, newoff, "reg", &cell, sizeof(cell)); 850 if (ret == -FDT_ERR_NOSPACE) { 851 ret = fdt_increase_size(blob, 512); 852 if (!ret) 853 goto add_reg; 854 else 855 goto err_size; 856 } else if (ret < 0) 857 goto err_prop; 858 859 add_label: 860 ret = fdt_setprop_string(blob, newoff, "label", part->name); 861 if (ret == -FDT_ERR_NOSPACE) { 862 ret = fdt_increase_size(blob, 512); 863 if (!ret) 864 goto add_label; 865 else 866 goto err_size; 867 } else if (ret < 0) 868 goto err_prop; 869 870 part_num++; 871 } 872 return 0; 873 err_size: 874 printf("Can't increase blob size: %s\n", fdt_strerror(ret)); 875 return ret; 876 err_prop: 877 printf("Can't add property: %s\n", fdt_strerror(ret)); 878 return ret; 879 } 880 881 /* 882 * Update partitions in nor/nand nodes using info from 883 * mtdparts environment variable. The nodes to update are 884 * specified by node_info structure which contains mtd device 885 * type and compatible string: E. g. the board code in 886 * ft_board_setup() could use: 887 * 888 * struct node_info nodes[] = { 889 * { "fsl,mpc5121-nfc", MTD_DEV_TYPE_NAND, }, 890 * { "cfi-flash", MTD_DEV_TYPE_NOR, }, 891 * }; 892 * 893 * fdt_fixup_mtdparts(blob, nodes, ARRAY_SIZE(nodes)); 894 */ 895 void fdt_fixup_mtdparts(void *blob, const struct node_info *node_info, 896 int node_info_size) 897 { 898 struct mtd_device *dev; 899 int i, idx; 900 int noff; 901 902 if (mtdparts_init() != 0) 903 return; 904 905 for (i = 0; i < node_info_size; i++) { 906 idx = 0; 907 noff = fdt_node_offset_by_compatible(blob, -1, 908 node_info[i].compat); 909 while (noff != -FDT_ERR_NOTFOUND) { 910 debug("%s: %s, mtd dev type %d\n", 911 fdt_get_name(blob, noff, 0), 912 node_info[i].compat, node_info[i].type); 913 dev = device_find(node_info[i].type, idx++); 914 if (dev) { 915 if (fdt_node_set_part_info(blob, noff, dev)) 916 return; /* return on error */ 917 } 918 919 /* Jump to next flash node */ 920 noff = fdt_node_offset_by_compatible(blob, noff, 921 node_info[i].compat); 922 } 923 } 924 } 925 #endif 926 927 void fdt_del_node_and_alias(void *blob, const char *alias) 928 { 929 int off = fdt_path_offset(blob, alias); 930 931 if (off < 0) 932 return; 933 934 fdt_del_node(blob, off); 935 936 off = fdt_path_offset(blob, "/aliases"); 937 fdt_delprop(blob, off, alias); 938 } 939 940 /* Max address size we deal with */ 941 #define OF_MAX_ADDR_CELLS 4 942 #define OF_BAD_ADDR FDT_ADDR_T_NONE 943 #define OF_CHECK_COUNTS(na, ns) ((na) > 0 && (na) <= OF_MAX_ADDR_CELLS && \ 944 (ns) > 0) 945 946 /* Debug utility */ 947 #ifdef DEBUG 948 static void of_dump_addr(const char *s, const fdt32_t *addr, int na) 949 { 950 printf("%s", s); 951 while(na--) 952 printf(" %08x", *(addr++)); 953 printf("\n"); 954 } 955 #else 956 static void of_dump_addr(const char *s, const fdt32_t *addr, int na) { } 957 #endif 958 959 /** 960 * struct of_bus - Callbacks for bus specific translators 961 * @name: A string used to identify this bus in debug output. 962 * @addresses: The name of the DT property from which addresses are 963 * to be read, typically "reg". 964 * @match: Return non-zero if the node whose parent is at 965 * parentoffset in the FDT blob corresponds to a bus 966 * of this type, otherwise return zero. If NULL a match 967 * is assumed. 968 * @count_cells:Count how many cells (be32 values) a node whose parent 969 * is at parentoffset in the FDT blob will require to 970 * represent its address (written to *addrc) & size 971 * (written to *sizec). 972 * @map: Map the address addr from the address space of this 973 * bus to that of its parent, making use of the ranges 974 * read from DT to an array at range. na and ns are the 975 * number of cells (be32 values) used to hold and address 976 * or size, respectively, for this bus. pna is the number 977 * of cells used to hold an address for the parent bus. 978 * Returns the address in the address space of the parent 979 * bus. 980 * @translate: Update the value of the address cells at addr within an 981 * FDT by adding offset to it. na specifies the number of 982 * cells used to hold the address being translated. Returns 983 * zero on success, non-zero on error. 984 * 985 * Each bus type will include a struct of_bus in the of_busses array, 986 * providing implementations of some or all of the functions used to 987 * match the bus & handle address translation for its children. 988 */ 989 struct of_bus { 990 const char *name; 991 const char *addresses; 992 int (*match)(const void *blob, int parentoffset); 993 void (*count_cells)(const void *blob, int parentoffset, 994 int *addrc, int *sizec); 995 u64 (*map)(fdt32_t *addr, const fdt32_t *range, 996 int na, int ns, int pna); 997 int (*translate)(fdt32_t *addr, u64 offset, int na); 998 }; 999 1000 /* Default translator (generic bus) */ 1001 void fdt_support_default_count_cells(const void *blob, int parentoffset, 1002 int *addrc, int *sizec) 1003 { 1004 const fdt32_t *prop; 1005 1006 if (addrc) 1007 *addrc = fdt_address_cells(blob, parentoffset); 1008 1009 if (sizec) { 1010 prop = fdt_getprop(blob, parentoffset, "#size-cells", NULL); 1011 if (prop) 1012 *sizec = be32_to_cpup(prop); 1013 else 1014 *sizec = 1; 1015 } 1016 } 1017 1018 static u64 of_bus_default_map(fdt32_t *addr, const fdt32_t *range, 1019 int na, int ns, int pna) 1020 { 1021 u64 cp, s, da; 1022 1023 cp = fdt_read_number(range, na); 1024 s = fdt_read_number(range + na + pna, ns); 1025 da = fdt_read_number(addr, na); 1026 1027 debug("OF: default map, cp=%llu, s=%llu, da=%llu\n", cp, s, da); 1028 1029 if (da < cp || da >= (cp + s)) 1030 return OF_BAD_ADDR; 1031 return da - cp; 1032 } 1033 1034 static int of_bus_default_translate(fdt32_t *addr, u64 offset, int na) 1035 { 1036 u64 a = fdt_read_number(addr, na); 1037 memset(addr, 0, na * 4); 1038 a += offset; 1039 if (na > 1) 1040 addr[na - 2] = cpu_to_fdt32(a >> 32); 1041 addr[na - 1] = cpu_to_fdt32(a & 0xffffffffu); 1042 1043 return 0; 1044 } 1045 1046 #ifdef CONFIG_OF_ISA_BUS 1047 1048 /* ISA bus translator */ 1049 static int of_bus_isa_match(const void *blob, int parentoffset) 1050 { 1051 const char *name; 1052 1053 name = fdt_get_name(blob, parentoffset, NULL); 1054 if (!name) 1055 return 0; 1056 1057 return !strcmp(name, "isa"); 1058 } 1059 1060 static void of_bus_isa_count_cells(const void *blob, int parentoffset, 1061 int *addrc, int *sizec) 1062 { 1063 if (addrc) 1064 *addrc = 2; 1065 if (sizec) 1066 *sizec = 1; 1067 } 1068 1069 static u64 of_bus_isa_map(fdt32_t *addr, const fdt32_t *range, 1070 int na, int ns, int pna) 1071 { 1072 u64 cp, s, da; 1073 1074 /* Check address type match */ 1075 if ((addr[0] ^ range[0]) & cpu_to_be32(1)) 1076 return OF_BAD_ADDR; 1077 1078 cp = fdt_read_number(range + 1, na - 1); 1079 s = fdt_read_number(range + na + pna, ns); 1080 da = fdt_read_number(addr + 1, na - 1); 1081 1082 debug("OF: ISA map, cp=%llu, s=%llu, da=%llu\n", cp, s, da); 1083 1084 if (da < cp || da >= (cp + s)) 1085 return OF_BAD_ADDR; 1086 return da - cp; 1087 } 1088 1089 static int of_bus_isa_translate(fdt32_t *addr, u64 offset, int na) 1090 { 1091 return of_bus_default_translate(addr + 1, offset, na - 1); 1092 } 1093 1094 #endif /* CONFIG_OF_ISA_BUS */ 1095 1096 /* Array of bus specific translators */ 1097 static struct of_bus of_busses[] = { 1098 #ifdef CONFIG_OF_ISA_BUS 1099 /* ISA */ 1100 { 1101 .name = "isa", 1102 .addresses = "reg", 1103 .match = of_bus_isa_match, 1104 .count_cells = of_bus_isa_count_cells, 1105 .map = of_bus_isa_map, 1106 .translate = of_bus_isa_translate, 1107 }, 1108 #endif /* CONFIG_OF_ISA_BUS */ 1109 /* Default */ 1110 { 1111 .name = "default", 1112 .addresses = "reg", 1113 .count_cells = fdt_support_default_count_cells, 1114 .map = of_bus_default_map, 1115 .translate = of_bus_default_translate, 1116 }, 1117 }; 1118 1119 static struct of_bus *of_match_bus(const void *blob, int parentoffset) 1120 { 1121 struct of_bus *bus; 1122 1123 if (ARRAY_SIZE(of_busses) == 1) 1124 return of_busses; 1125 1126 for (bus = of_busses; bus; bus++) { 1127 if (!bus->match || bus->match(blob, parentoffset)) 1128 return bus; 1129 } 1130 1131 /* 1132 * We should always have matched the default bus at least, since 1133 * it has a NULL match field. If we didn't then it somehow isn't 1134 * in the of_busses array or something equally catastrophic has 1135 * gone wrong. 1136 */ 1137 assert(0); 1138 return NULL; 1139 } 1140 1141 static int of_translate_one(const void *blob, int parent, struct of_bus *bus, 1142 struct of_bus *pbus, fdt32_t *addr, 1143 int na, int ns, int pna, const char *rprop) 1144 { 1145 const fdt32_t *ranges; 1146 int rlen; 1147 int rone; 1148 u64 offset = OF_BAD_ADDR; 1149 1150 /* Normally, an absence of a "ranges" property means we are 1151 * crossing a non-translatable boundary, and thus the addresses 1152 * below the current not cannot be converted to CPU physical ones. 1153 * Unfortunately, while this is very clear in the spec, it's not 1154 * what Apple understood, and they do have things like /uni-n or 1155 * /ht nodes with no "ranges" property and a lot of perfectly 1156 * useable mapped devices below them. Thus we treat the absence of 1157 * "ranges" as equivalent to an empty "ranges" property which means 1158 * a 1:1 translation at that level. It's up to the caller not to try 1159 * to translate addresses that aren't supposed to be translated in 1160 * the first place. --BenH. 1161 */ 1162 ranges = fdt_getprop(blob, parent, rprop, &rlen); 1163 if (ranges == NULL || rlen == 0) { 1164 offset = fdt_read_number(addr, na); 1165 memset(addr, 0, pna * 4); 1166 debug("OF: no ranges, 1:1 translation\n"); 1167 goto finish; 1168 } 1169 1170 debug("OF: walking ranges...\n"); 1171 1172 /* Now walk through the ranges */ 1173 rlen /= 4; 1174 rone = na + pna + ns; 1175 for (; rlen >= rone; rlen -= rone, ranges += rone) { 1176 offset = bus->map(addr, ranges, na, ns, pna); 1177 if (offset != OF_BAD_ADDR) 1178 break; 1179 } 1180 if (offset == OF_BAD_ADDR) { 1181 debug("OF: not found !\n"); 1182 return 1; 1183 } 1184 memcpy(addr, ranges + na, 4 * pna); 1185 1186 finish: 1187 of_dump_addr("OF: parent translation for:", addr, pna); 1188 debug("OF: with offset: %llu\n", offset); 1189 1190 /* Translate it into parent bus space */ 1191 return pbus->translate(addr, offset, pna); 1192 } 1193 1194 /* 1195 * Translate an address from the device-tree into a CPU physical address, 1196 * this walks up the tree and applies the various bus mappings on the 1197 * way. 1198 * 1199 * Note: We consider that crossing any level with #size-cells == 0 to mean 1200 * that translation is impossible (that is we are not dealing with a value 1201 * that can be mapped to a cpu physical address). This is not really specified 1202 * that way, but this is traditionally the way IBM at least do things 1203 */ 1204 static u64 __of_translate_address(const void *blob, int node_offset, 1205 const fdt32_t *in_addr, const char *rprop) 1206 { 1207 int parent; 1208 struct of_bus *bus, *pbus; 1209 fdt32_t addr[OF_MAX_ADDR_CELLS]; 1210 int na, ns, pna, pns; 1211 u64 result = OF_BAD_ADDR; 1212 1213 debug("OF: ** translation for device %s **\n", 1214 fdt_get_name(blob, node_offset, NULL)); 1215 1216 /* Get parent & match bus type */ 1217 parent = fdt_parent_offset(blob, node_offset); 1218 if (parent < 0) 1219 goto bail; 1220 bus = of_match_bus(blob, parent); 1221 1222 /* Cound address cells & copy address locally */ 1223 bus->count_cells(blob, parent, &na, &ns); 1224 if (!OF_CHECK_COUNTS(na, ns)) { 1225 printf("%s: Bad cell count for %s\n", __FUNCTION__, 1226 fdt_get_name(blob, node_offset, NULL)); 1227 goto bail; 1228 } 1229 memcpy(addr, in_addr, na * 4); 1230 1231 debug("OF: bus is %s (na=%d, ns=%d) on %s\n", 1232 bus->name, na, ns, fdt_get_name(blob, parent, NULL)); 1233 of_dump_addr("OF: translating address:", addr, na); 1234 1235 /* Translate */ 1236 for (;;) { 1237 /* Switch to parent bus */ 1238 node_offset = parent; 1239 parent = fdt_parent_offset(blob, node_offset); 1240 1241 /* If root, we have finished */ 1242 if (parent < 0) { 1243 debug("OF: reached root node\n"); 1244 result = fdt_read_number(addr, na); 1245 break; 1246 } 1247 1248 /* Get new parent bus and counts */ 1249 pbus = of_match_bus(blob, parent); 1250 pbus->count_cells(blob, parent, &pna, &pns); 1251 if (!OF_CHECK_COUNTS(pna, pns)) { 1252 printf("%s: Bad cell count for %s\n", __FUNCTION__, 1253 fdt_get_name(blob, node_offset, NULL)); 1254 break; 1255 } 1256 1257 debug("OF: parent bus is %s (na=%d, ns=%d) on %s\n", 1258 pbus->name, pna, pns, fdt_get_name(blob, parent, NULL)); 1259 1260 /* Apply bus translation */ 1261 if (of_translate_one(blob, node_offset, bus, pbus, 1262 addr, na, ns, pna, rprop)) 1263 break; 1264 1265 /* Complete the move up one level */ 1266 na = pna; 1267 ns = pns; 1268 bus = pbus; 1269 1270 of_dump_addr("OF: one level translation:", addr, na); 1271 } 1272 bail: 1273 1274 return result; 1275 } 1276 1277 u64 fdt_translate_address(const void *blob, int node_offset, 1278 const fdt32_t *in_addr) 1279 { 1280 return __of_translate_address(blob, node_offset, in_addr, "ranges"); 1281 } 1282 1283 /** 1284 * fdt_node_offset_by_compat_reg: Find a node that matches compatiable and 1285 * who's reg property matches a physical cpu address 1286 * 1287 * @blob: ptr to device tree 1288 * @compat: compatiable string to match 1289 * @compat_off: property name 1290 * 1291 */ 1292 int fdt_node_offset_by_compat_reg(void *blob, const char *compat, 1293 phys_addr_t compat_off) 1294 { 1295 int len, off = fdt_node_offset_by_compatible(blob, -1, compat); 1296 while (off != -FDT_ERR_NOTFOUND) { 1297 const fdt32_t *reg = fdt_getprop(blob, off, "reg", &len); 1298 if (reg) { 1299 if (compat_off == fdt_translate_address(blob, off, reg)) 1300 return off; 1301 } 1302 off = fdt_node_offset_by_compatible(blob, off, compat); 1303 } 1304 1305 return -FDT_ERR_NOTFOUND; 1306 } 1307 1308 /** 1309 * fdt_alloc_phandle: Return next free phandle value 1310 * 1311 * @blob: ptr to device tree 1312 */ 1313 int fdt_alloc_phandle(void *blob) 1314 { 1315 int offset; 1316 uint32_t phandle = 0; 1317 1318 for (offset = fdt_next_node(blob, -1, NULL); offset >= 0; 1319 offset = fdt_next_node(blob, offset, NULL)) { 1320 phandle = max(phandle, fdt_get_phandle(blob, offset)); 1321 } 1322 1323 return phandle + 1; 1324 } 1325 1326 /* 1327 * fdt_set_phandle: Create a phandle property for the given node 1328 * 1329 * @fdt: ptr to device tree 1330 * @nodeoffset: node to update 1331 * @phandle: phandle value to set (must be unique) 1332 */ 1333 int fdt_set_phandle(void *fdt, int nodeoffset, uint32_t phandle) 1334 { 1335 int ret; 1336 1337 #ifdef DEBUG 1338 int off = fdt_node_offset_by_phandle(fdt, phandle); 1339 1340 if ((off >= 0) && (off != nodeoffset)) { 1341 char buf[64]; 1342 1343 fdt_get_path(fdt, nodeoffset, buf, sizeof(buf)); 1344 printf("Trying to update node %s with phandle %u ", 1345 buf, phandle); 1346 1347 fdt_get_path(fdt, off, buf, sizeof(buf)); 1348 printf("that already exists in node %s.\n", buf); 1349 return -FDT_ERR_BADPHANDLE; 1350 } 1351 #endif 1352 1353 ret = fdt_setprop_cell(fdt, nodeoffset, "phandle", phandle); 1354 if (ret < 0) 1355 return ret; 1356 1357 /* 1358 * For now, also set the deprecated "linux,phandle" property, so that we 1359 * don't break older kernels. 1360 */ 1361 ret = fdt_setprop_cell(fdt, nodeoffset, "linux,phandle", phandle); 1362 1363 return ret; 1364 } 1365 1366 /* 1367 * fdt_create_phandle: Create a phandle property for the given node 1368 * 1369 * @fdt: ptr to device tree 1370 * @nodeoffset: node to update 1371 */ 1372 unsigned int fdt_create_phandle(void *fdt, int nodeoffset) 1373 { 1374 /* see if there is a phandle already */ 1375 int phandle = fdt_get_phandle(fdt, nodeoffset); 1376 1377 /* if we got 0, means no phandle so create one */ 1378 if (phandle == 0) { 1379 int ret; 1380 1381 phandle = fdt_alloc_phandle(fdt); 1382 ret = fdt_set_phandle(fdt, nodeoffset, phandle); 1383 if (ret < 0) { 1384 printf("Can't set phandle %u: %s\n", phandle, 1385 fdt_strerror(ret)); 1386 return 0; 1387 } 1388 } 1389 1390 return phandle; 1391 } 1392 1393 /* 1394 * fdt_set_node_status: Set status for the given node 1395 * 1396 * @fdt: ptr to device tree 1397 * @nodeoffset: node to update 1398 * @status: FDT_STATUS_OKAY, FDT_STATUS_DISABLED, 1399 * FDT_STATUS_FAIL, FDT_STATUS_FAIL_ERROR_CODE 1400 * @error_code: optional, only used if status is FDT_STATUS_FAIL_ERROR_CODE 1401 */ 1402 int fdt_set_node_status(void *fdt, int nodeoffset, 1403 enum fdt_status status, unsigned int error_code) 1404 { 1405 char buf[16]; 1406 int ret = 0; 1407 1408 if (nodeoffset < 0) 1409 return nodeoffset; 1410 1411 switch (status) { 1412 case FDT_STATUS_OKAY: 1413 ret = fdt_setprop_string(fdt, nodeoffset, "status", "okay"); 1414 break; 1415 case FDT_STATUS_DISABLED: 1416 ret = fdt_setprop_string(fdt, nodeoffset, "status", "disabled"); 1417 break; 1418 case FDT_STATUS_FAIL: 1419 ret = fdt_setprop_string(fdt, nodeoffset, "status", "fail"); 1420 break; 1421 case FDT_STATUS_FAIL_ERROR_CODE: 1422 sprintf(buf, "fail-%d", error_code); 1423 ret = fdt_setprop_string(fdt, nodeoffset, "status", buf); 1424 break; 1425 default: 1426 printf("Invalid fdt status: %x\n", status); 1427 ret = -1; 1428 break; 1429 } 1430 1431 return ret; 1432 } 1433 1434 /* 1435 * fdt_set_status_by_alias: Set status for the given node given an alias 1436 * 1437 * @fdt: ptr to device tree 1438 * @alias: alias of node to update 1439 * @status: FDT_STATUS_OKAY, FDT_STATUS_DISABLED, 1440 * FDT_STATUS_FAIL, FDT_STATUS_FAIL_ERROR_CODE 1441 * @error_code: optional, only used if status is FDT_STATUS_FAIL_ERROR_CODE 1442 */ 1443 int fdt_set_status_by_alias(void *fdt, const char* alias, 1444 enum fdt_status status, unsigned int error_code) 1445 { 1446 int offset = fdt_path_offset(fdt, alias); 1447 1448 return fdt_set_node_status(fdt, offset, status, error_code); 1449 } 1450 1451 #if defined(CONFIG_VIDEO) || defined(CONFIG_LCD) 1452 int fdt_add_edid(void *blob, const char *compat, unsigned char *edid_buf) 1453 { 1454 int noff; 1455 int ret; 1456 1457 noff = fdt_node_offset_by_compatible(blob, -1, compat); 1458 if (noff != -FDT_ERR_NOTFOUND) { 1459 debug("%s: %s\n", fdt_get_name(blob, noff, 0), compat); 1460 add_edid: 1461 ret = fdt_setprop(blob, noff, "edid", edid_buf, 128); 1462 if (ret == -FDT_ERR_NOSPACE) { 1463 ret = fdt_increase_size(blob, 512); 1464 if (!ret) 1465 goto add_edid; 1466 else 1467 goto err_size; 1468 } else if (ret < 0) { 1469 printf("Can't add property: %s\n", fdt_strerror(ret)); 1470 return ret; 1471 } 1472 } 1473 return 0; 1474 err_size: 1475 printf("Can't increase blob size: %s\n", fdt_strerror(ret)); 1476 return ret; 1477 } 1478 #endif 1479 1480 /* 1481 * Verify the physical address of device tree node for a given alias 1482 * 1483 * This function locates the device tree node of a given alias, and then 1484 * verifies that the physical address of that device matches the given 1485 * parameter. It displays a message if there is a mismatch. 1486 * 1487 * Returns 1 on success, 0 on failure 1488 */ 1489 int fdt_verify_alias_address(void *fdt, int anode, const char *alias, u64 addr) 1490 { 1491 const char *path; 1492 const fdt32_t *reg; 1493 int node, len; 1494 u64 dt_addr; 1495 1496 path = fdt_getprop(fdt, anode, alias, NULL); 1497 if (!path) { 1498 /* If there's no such alias, then it's not a failure */ 1499 return 1; 1500 } 1501 1502 node = fdt_path_offset(fdt, path); 1503 if (node < 0) { 1504 printf("Warning: device tree alias '%s' points to invalid " 1505 "node %s.\n", alias, path); 1506 return 0; 1507 } 1508 1509 reg = fdt_getprop(fdt, node, "reg", &len); 1510 if (!reg) { 1511 printf("Warning: device tree node '%s' has no address.\n", 1512 path); 1513 return 0; 1514 } 1515 1516 dt_addr = fdt_translate_address(fdt, node, reg); 1517 if (addr != dt_addr) { 1518 printf("Warning: U-Boot configured device %s at address %llu,\n" 1519 "but the device tree has it address %llx.\n", 1520 alias, addr, dt_addr); 1521 return 0; 1522 } 1523 1524 return 1; 1525 } 1526 1527 /* 1528 * Returns the base address of an SOC or PCI node 1529 */ 1530 u64 fdt_get_base_address(const void *fdt, int node) 1531 { 1532 int size; 1533 const fdt32_t *prop; 1534 1535 prop = fdt_getprop(fdt, node, "reg", &size); 1536 1537 return prop ? fdt_translate_address(fdt, node, prop) : 0; 1538 } 1539 1540 /* 1541 * Read a property of size <prop_len>. Currently only supports 1 or 2 cells. 1542 */ 1543 static int fdt_read_prop(const fdt32_t *prop, int prop_len, int cell_off, 1544 uint64_t *val, int cells) 1545 { 1546 const fdt32_t *prop32 = &prop[cell_off]; 1547 const fdt64_t *prop64 = (const fdt64_t *)&prop[cell_off]; 1548 1549 if ((cell_off + cells) > prop_len) 1550 return -FDT_ERR_NOSPACE; 1551 1552 switch (cells) { 1553 case 1: 1554 *val = fdt32_to_cpu(*prop32); 1555 break; 1556 case 2: 1557 *val = fdt64_to_cpu(*prop64); 1558 break; 1559 default: 1560 return -FDT_ERR_NOSPACE; 1561 } 1562 1563 return 0; 1564 } 1565 1566 /** 1567 * fdt_read_range - Read a node's n'th range property 1568 * 1569 * @fdt: ptr to device tree 1570 * @node: offset of node 1571 * @n: range index 1572 * @child_addr: pointer to storage for the "child address" field 1573 * @addr: pointer to storage for the CPU view translated physical start 1574 * @len: pointer to storage for the range length 1575 * 1576 * Convenience function that reads and interprets a specific range out of 1577 * a number of the "ranges" property array. 1578 */ 1579 int fdt_read_range(void *fdt, int node, int n, uint64_t *child_addr, 1580 uint64_t *addr, uint64_t *len) 1581 { 1582 int pnode = fdt_parent_offset(fdt, node); 1583 const fdt32_t *ranges; 1584 int pacells; 1585 int acells; 1586 int scells; 1587 int ranges_len; 1588 int cell = 0; 1589 int r = 0; 1590 1591 /* 1592 * The "ranges" property is an array of 1593 * { <child address> <parent address> <size in child address space> } 1594 * 1595 * All 3 elements can span a diffent number of cells. Fetch their size. 1596 */ 1597 pacells = fdt_getprop_u32_default_node(fdt, pnode, 0, "#address-cells", 1); 1598 acells = fdt_getprop_u32_default_node(fdt, node, 0, "#address-cells", 1); 1599 scells = fdt_getprop_u32_default_node(fdt, node, 0, "#size-cells", 1); 1600 1601 /* Now try to get the ranges property */ 1602 ranges = fdt_getprop(fdt, node, "ranges", &ranges_len); 1603 if (!ranges) 1604 return -FDT_ERR_NOTFOUND; 1605 ranges_len /= sizeof(uint32_t); 1606 1607 /* Jump to the n'th entry */ 1608 cell = n * (pacells + acells + scells); 1609 1610 /* Read <child address> */ 1611 if (child_addr) { 1612 r = fdt_read_prop(ranges, ranges_len, cell, child_addr, 1613 acells); 1614 if (r) 1615 return r; 1616 } 1617 cell += acells; 1618 1619 /* Read <parent address> */ 1620 if (addr) 1621 *addr = fdt_translate_address(fdt, node, ranges + cell); 1622 cell += pacells; 1623 1624 /* Read <size in child address space> */ 1625 if (len) { 1626 r = fdt_read_prop(ranges, ranges_len, cell, len, scells); 1627 if (r) 1628 return r; 1629 } 1630 1631 return 0; 1632 } 1633 1634 /** 1635 * fdt_setup_simplefb_node - Fill and enable a simplefb node 1636 * 1637 * @fdt: ptr to device tree 1638 * @node: offset of the simplefb node 1639 * @base_address: framebuffer base address 1640 * @width: width in pixels 1641 * @height: height in pixels 1642 * @stride: bytes per line 1643 * @format: pixel format string 1644 * 1645 * Convenience function to fill and enable a simplefb node. 1646 */ 1647 int fdt_setup_simplefb_node(void *fdt, int node, u64 base_address, u32 width, 1648 u32 height, u32 stride, const char *format) 1649 { 1650 char name[32]; 1651 fdt32_t cells[4]; 1652 int i, addrc, sizec, ret; 1653 1654 fdt_support_default_count_cells(fdt, fdt_parent_offset(fdt, node), 1655 &addrc, &sizec); 1656 i = 0; 1657 if (addrc == 2) 1658 cells[i++] = cpu_to_fdt32(base_address >> 32); 1659 cells[i++] = cpu_to_fdt32(base_address); 1660 if (sizec == 2) 1661 cells[i++] = 0; 1662 cells[i++] = cpu_to_fdt32(height * stride); 1663 1664 ret = fdt_setprop(fdt, node, "reg", cells, sizeof(cells[0]) * i); 1665 if (ret < 0) 1666 return ret; 1667 1668 snprintf(name, sizeof(name), "framebuffer@%llx", base_address); 1669 ret = fdt_set_name(fdt, node, name); 1670 if (ret < 0) 1671 return ret; 1672 1673 ret = fdt_setprop_u32(fdt, node, "width", width); 1674 if (ret < 0) 1675 return ret; 1676 1677 ret = fdt_setprop_u32(fdt, node, "height", height); 1678 if (ret < 0) 1679 return ret; 1680 1681 ret = fdt_setprop_u32(fdt, node, "stride", stride); 1682 if (ret < 0) 1683 return ret; 1684 1685 ret = fdt_setprop_string(fdt, node, "format", format); 1686 if (ret < 0) 1687 return ret; 1688 1689 ret = fdt_setprop_string(fdt, node, "status", "okay"); 1690 if (ret < 0) 1691 return ret; 1692 1693 return 0; 1694 } 1695 1696 /* 1697 * Update native-mode in display-timings from display environment variable. 1698 * The node to update are specified by path. 1699 */ 1700 int fdt_fixup_display(void *blob, const char *path, const char *display) 1701 { 1702 int off, toff; 1703 1704 if (!display || !path) 1705 return -FDT_ERR_NOTFOUND; 1706 1707 toff = fdt_path_offset(blob, path); 1708 if (toff >= 0) 1709 toff = fdt_subnode_offset(blob, toff, "display-timings"); 1710 if (toff < 0) 1711 return toff; 1712 1713 for (off = fdt_first_subnode(blob, toff); 1714 off >= 0; 1715 off = fdt_next_subnode(blob, off)) { 1716 uint32_t h = fdt_get_phandle(blob, off); 1717 debug("%s:0x%x\n", fdt_get_name(blob, off, NULL), 1718 fdt32_to_cpu(h)); 1719 if (strcasecmp(fdt_get_name(blob, off, NULL), display) == 0) 1720 return fdt_setprop_u32(blob, toff, "native-mode", h); 1721 } 1722 return toff; 1723 } 1724 1725 #ifdef CONFIG_OF_LIBFDT_OVERLAY 1726 /** 1727 * fdt_overlay_apply_verbose - Apply an overlay with verbose error reporting 1728 * 1729 * @fdt: ptr to device tree 1730 * @fdto: ptr to device tree overlay 1731 * 1732 * Convenience function to apply an overlay and display helpful messages 1733 * in the case of an error 1734 */ 1735 int fdt_overlay_apply_verbose(void *fdt, void *fdto) 1736 { 1737 int err; 1738 bool has_symbols; 1739 1740 err = fdt_path_offset(fdt, "/__symbols__"); 1741 has_symbols = err >= 0; 1742 1743 err = fdt_overlay_apply(fdt, fdto); 1744 if (err < 0) { 1745 printf("failed on fdt_overlay_apply(): %s\n", 1746 fdt_strerror(err)); 1747 if (!has_symbols) { 1748 printf("base fdt does did not have a /__symbols__ node\n"); 1749 printf("make sure you've compiled with -@\n"); 1750 } 1751 } 1752 return err; 1753 } 1754 #endif 1755