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 <inttypes.h> 12 #include <stdio_dev.h> 13 #include <linux/ctype.h> 14 #include <linux/types.h> 15 #include <asm/global_data.h> 16 #include <libfdt.h> 17 #include <fdt_support.h> 18 #include <exports.h> 19 #include <fdtdec.h> 20 21 /** 22 * fdt_getprop_u32_default_node - Return a node's property or a default 23 * 24 * @fdt: ptr to device tree 25 * @off: offset of node 26 * @cell: cell offset in property 27 * @prop: property name 28 * @dflt: default value if the property isn't found 29 * 30 * Convenience function to return a node's property or a default value if 31 * the property doesn't exist. 32 */ 33 u32 fdt_getprop_u32_default_node(const void *fdt, int off, int cell, 34 const char *prop, const u32 dflt) 35 { 36 const fdt32_t *val; 37 int len; 38 39 val = fdt_getprop(fdt, off, prop, &len); 40 41 /* Check if property exists */ 42 if (!val) 43 return dflt; 44 45 /* Check if property is long enough */ 46 if (len < ((cell + 1) * sizeof(uint32_t))) 47 return dflt; 48 49 return fdt32_to_cpu(*val); 50 } 51 52 /** 53 * fdt_getprop_u32_default - Find a node and return it's property or a default 54 * 55 * @fdt: ptr to device tree 56 * @path: path of node 57 * @prop: property name 58 * @dflt: default value if the property isn't found 59 * 60 * Convenience function to find a node and return it's property or a 61 * default value if it doesn't exist. 62 */ 63 u32 fdt_getprop_u32_default(const void *fdt, const char *path, 64 const char *prop, const u32 dflt) 65 { 66 int off; 67 68 off = fdt_path_offset(fdt, path); 69 if (off < 0) 70 return dflt; 71 72 return fdt_getprop_u32_default_node(fdt, off, 0, prop, dflt); 73 } 74 75 /** 76 * fdt_find_and_setprop: Find a node and set it's property 77 * 78 * @fdt: ptr to device tree 79 * @node: path of node 80 * @prop: property name 81 * @val: ptr to new value 82 * @len: length of new property value 83 * @create: flag to create the property if it doesn't exist 84 * 85 * Convenience function to directly set a property given the path to the node. 86 */ 87 int fdt_find_and_setprop(void *fdt, const char *node, const char *prop, 88 const void *val, int len, int create) 89 { 90 int nodeoff = fdt_path_offset(fdt, node); 91 92 if (nodeoff < 0) 93 return nodeoff; 94 95 if ((!create) && (fdt_get_property(fdt, nodeoff, prop, NULL) == NULL)) 96 return 0; /* create flag not set; so exit quietly */ 97 98 return fdt_setprop(fdt, nodeoff, prop, val, len); 99 } 100 101 /** 102 * fdt_find_or_add_subnode() - find or possibly add a subnode of a given node 103 * 104 * @fdt: pointer to the device tree blob 105 * @parentoffset: structure block offset of a node 106 * @name: name of the subnode to locate 107 * 108 * fdt_subnode_offset() finds a subnode of the node with a given name. 109 * If the subnode does not exist, it will be created. 110 */ 111 int fdt_find_or_add_subnode(void *fdt, int parentoffset, const char *name) 112 { 113 int offset; 114 115 offset = fdt_subnode_offset(fdt, parentoffset, name); 116 117 if (offset == -FDT_ERR_NOTFOUND) 118 offset = fdt_add_subnode(fdt, parentoffset, name); 119 120 if (offset < 0) 121 printf("%s: %s: %s\n", __func__, name, fdt_strerror(offset)); 122 123 return offset; 124 } 125 126 /* rename to CONFIG_OF_STDOUT_PATH ? */ 127 #if defined(OF_STDOUT_PATH) 128 static int fdt_fixup_stdout(void *fdt, int chosenoff) 129 { 130 return fdt_setprop(fdt, chosenoff, "linux,stdout-path", 131 OF_STDOUT_PATH, strlen(OF_STDOUT_PATH) + 1); 132 } 133 #elif defined(CONFIG_OF_STDOUT_VIA_ALIAS) && defined(CONFIG_CONS_INDEX) 134 static void fdt_fill_multisername(char *sername, size_t maxlen) 135 { 136 const char *outname = stdio_devices[stdout]->name; 137 138 if (strcmp(outname, "serial") > 0) 139 strncpy(sername, outname, maxlen); 140 141 /* eserial? */ 142 if (strcmp(outname + 1, "serial") > 0) 143 strncpy(sername, outname + 1, maxlen); 144 } 145 146 static int fdt_fixup_stdout(void *fdt, int chosenoff) 147 { 148 int err; 149 int aliasoff; 150 char sername[9] = { 0 }; 151 const void *path; 152 int len; 153 char tmp[256]; /* long enough */ 154 155 fdt_fill_multisername(sername, sizeof(sername) - 1); 156 if (!sername[0]) 157 sprintf(sername, "serial%d", CONFIG_CONS_INDEX - 1); 158 159 aliasoff = fdt_path_offset(fdt, "/aliases"); 160 if (aliasoff < 0) { 161 err = aliasoff; 162 goto noalias; 163 } 164 165 path = fdt_getprop(fdt, aliasoff, sername, &len); 166 if (!path) { 167 err = len; 168 goto noalias; 169 } 170 171 /* fdt_setprop may break "path" so we copy it to tmp buffer */ 172 memcpy(tmp, path, len); 173 174 err = fdt_setprop(fdt, chosenoff, "linux,stdout-path", tmp, len); 175 if (err < 0) 176 printf("WARNING: could not set linux,stdout-path %s.\n", 177 fdt_strerror(err)); 178 179 return err; 180 181 noalias: 182 printf("WARNING: %s: could not read %s alias: %s\n", 183 __func__, sername, fdt_strerror(err)); 184 185 return 0; 186 } 187 #else 188 static int fdt_fixup_stdout(void *fdt, int chosenoff) 189 { 190 return 0; 191 } 192 #endif 193 194 static inline int fdt_setprop_uxx(void *fdt, int nodeoffset, const char *name, 195 uint64_t val, int is_u64) 196 { 197 if (is_u64) 198 return fdt_setprop_u64(fdt, nodeoffset, name, val); 199 else 200 return fdt_setprop_u32(fdt, nodeoffset, name, (uint32_t)val); 201 } 202 203 int fdt_root(void *fdt) 204 { 205 char *serial; 206 int err; 207 208 err = fdt_check_header(fdt); 209 if (err < 0) { 210 printf("fdt_root: %s\n", fdt_strerror(err)); 211 return err; 212 } 213 214 serial = getenv("serial#"); 215 if (serial) { 216 err = fdt_setprop(fdt, 0, "serial-number", serial, 217 strlen(serial) + 1); 218 219 if (err < 0) { 220 printf("WARNING: could not set serial-number %s.\n", 221 fdt_strerror(err)); 222 return err; 223 } 224 } 225 226 return 0; 227 } 228 229 int fdt_initrd(void *fdt, ulong initrd_start, ulong initrd_end) 230 { 231 int nodeoffset; 232 int err, j, total; 233 int is_u64; 234 uint64_t addr, size; 235 236 /* just return if the size of initrd is zero */ 237 if (initrd_start == initrd_end) 238 return 0; 239 240 /* find or create "/chosen" node. */ 241 nodeoffset = fdt_find_or_add_subnode(fdt, 0, "chosen"); 242 if (nodeoffset < 0) 243 return nodeoffset; 244 245 total = fdt_num_mem_rsv(fdt); 246 247 /* 248 * Look for an existing entry and update it. If we don't find 249 * the entry, we will j be the next available slot. 250 */ 251 for (j = 0; j < total; j++) { 252 err = fdt_get_mem_rsv(fdt, j, &addr, &size); 253 if (addr == initrd_start) { 254 fdt_del_mem_rsv(fdt, j); 255 break; 256 } 257 } 258 259 err = fdt_add_mem_rsv(fdt, initrd_start, initrd_end - initrd_start); 260 if (err < 0) { 261 printf("fdt_initrd: %s\n", fdt_strerror(err)); 262 return err; 263 } 264 265 is_u64 = (fdt_address_cells(fdt, 0) == 2); 266 267 err = fdt_setprop_uxx(fdt, nodeoffset, "linux,initrd-start", 268 (uint64_t)initrd_start, is_u64); 269 270 if (err < 0) { 271 printf("WARNING: could not set linux,initrd-start %s.\n", 272 fdt_strerror(err)); 273 return err; 274 } 275 276 err = fdt_setprop_uxx(fdt, nodeoffset, "linux,initrd-end", 277 (uint64_t)initrd_end, is_u64); 278 279 if (err < 0) { 280 printf("WARNING: could not set linux,initrd-end %s.\n", 281 fdt_strerror(err)); 282 283 return err; 284 } 285 286 return 0; 287 } 288 289 int fdt_chosen(void *fdt) 290 { 291 int nodeoffset; 292 int err; 293 char *str; /* used to set string properties */ 294 295 err = fdt_check_header(fdt); 296 if (err < 0) { 297 printf("fdt_chosen: %s\n", fdt_strerror(err)); 298 return err; 299 } 300 301 /* find or create "/chosen" node. */ 302 nodeoffset = fdt_find_or_add_subnode(fdt, 0, "chosen"); 303 if (nodeoffset < 0) 304 return nodeoffset; 305 306 str = getenv("bootargs"); 307 if (str) { 308 err = fdt_setprop(fdt, nodeoffset, "bootargs", str, 309 strlen(str) + 1); 310 if (err < 0) { 311 printf("WARNING: could not set bootargs %s.\n", 312 fdt_strerror(err)); 313 return err; 314 } 315 } 316 317 return fdt_fixup_stdout(fdt, nodeoffset); 318 } 319 320 void do_fixup_by_path(void *fdt, const char *path, const char *prop, 321 const void *val, int len, int create) 322 { 323 #if defined(DEBUG) 324 int i; 325 debug("Updating property '%s/%s' = ", path, prop); 326 for (i = 0; i < len; i++) 327 debug(" %.2x", *(u8*)(val+i)); 328 debug("\n"); 329 #endif 330 int rc = fdt_find_and_setprop(fdt, path, prop, val, len, create); 331 if (rc) 332 printf("Unable to update property %s:%s, err=%s\n", 333 path, prop, fdt_strerror(rc)); 334 } 335 336 void do_fixup_by_path_u32(void *fdt, const char *path, const char *prop, 337 u32 val, int create) 338 { 339 fdt32_t tmp = cpu_to_fdt32(val); 340 do_fixup_by_path(fdt, path, prop, &tmp, sizeof(tmp), create); 341 } 342 343 void do_fixup_by_prop(void *fdt, 344 const char *pname, const void *pval, int plen, 345 const char *prop, const void *val, int len, 346 int create) 347 { 348 int off; 349 #if defined(DEBUG) 350 int i; 351 debug("Updating property '%s' = ", prop); 352 for (i = 0; i < len; i++) 353 debug(" %.2x", *(u8*)(val+i)); 354 debug("\n"); 355 #endif 356 off = fdt_node_offset_by_prop_value(fdt, -1, pname, pval, plen); 357 while (off != -FDT_ERR_NOTFOUND) { 358 if (create || (fdt_get_property(fdt, off, prop, NULL) != NULL)) 359 fdt_setprop(fdt, off, prop, val, len); 360 off = fdt_node_offset_by_prop_value(fdt, off, pname, pval, plen); 361 } 362 } 363 364 void do_fixup_by_prop_u32(void *fdt, 365 const char *pname, const void *pval, int plen, 366 const char *prop, u32 val, int create) 367 { 368 fdt32_t tmp = cpu_to_fdt32(val); 369 do_fixup_by_prop(fdt, pname, pval, plen, prop, &tmp, 4, create); 370 } 371 372 void do_fixup_by_compat(void *fdt, const char *compat, 373 const char *prop, const void *val, int len, int create) 374 { 375 int off = -1; 376 #if defined(DEBUG) 377 int i; 378 debug("Updating property '%s' = ", prop); 379 for (i = 0; i < len; i++) 380 debug(" %.2x", *(u8*)(val+i)); 381 debug("\n"); 382 #endif 383 off = fdt_node_offset_by_compatible(fdt, -1, compat); 384 while (off != -FDT_ERR_NOTFOUND) { 385 if (create || (fdt_get_property(fdt, off, prop, NULL) != NULL)) 386 fdt_setprop(fdt, off, prop, val, len); 387 off = fdt_node_offset_by_compatible(fdt, off, compat); 388 } 389 } 390 391 void do_fixup_by_compat_u32(void *fdt, const char *compat, 392 const char *prop, u32 val, int create) 393 { 394 fdt32_t tmp = cpu_to_fdt32(val); 395 do_fixup_by_compat(fdt, compat, prop, &tmp, 4, create); 396 } 397 398 /* 399 * fdt_pack_reg - pack address and size array into the "reg"-suitable stream 400 */ 401 static int fdt_pack_reg(const void *fdt, void *buf, u64 *address, u64 *size, 402 int n) 403 { 404 int i; 405 int address_cells = fdt_address_cells(fdt, 0); 406 int size_cells = fdt_size_cells(fdt, 0); 407 char *p = buf; 408 409 for (i = 0; i < n; i++) { 410 if (address_cells == 2) 411 *(fdt64_t *)p = cpu_to_fdt64(address[i]); 412 else 413 *(fdt32_t *)p = cpu_to_fdt32(address[i]); 414 p += 4 * address_cells; 415 416 if (size_cells == 2) 417 *(fdt64_t *)p = cpu_to_fdt64(size[i]); 418 else 419 *(fdt32_t *)p = cpu_to_fdt32(size[i]); 420 p += 4 * size_cells; 421 } 422 423 return p - (char *)buf; 424 } 425 426 #ifdef CONFIG_NR_DRAM_BANKS 427 #define MEMORY_BANKS_MAX CONFIG_NR_DRAM_BANKS 428 #else 429 #define MEMORY_BANKS_MAX 4 430 #endif 431 int fdt_fixup_memory_banks(void *blob, u64 start[], u64 size[], int banks) 432 { 433 int err, nodeoffset; 434 int len; 435 u8 tmp[MEMORY_BANKS_MAX * 16]; /* Up to 64-bit address + 64-bit size */ 436 437 if (banks > MEMORY_BANKS_MAX) { 438 printf("%s: num banks %d exceeds hardcoded limit %d." 439 " Recompile with higher MEMORY_BANKS_MAX?\n", 440 __FUNCTION__, banks, MEMORY_BANKS_MAX); 441 return -1; 442 } 443 444 err = fdt_check_header(blob); 445 if (err < 0) { 446 printf("%s: %s\n", __FUNCTION__, fdt_strerror(err)); 447 return err; 448 } 449 450 /* find or create "/memory" node. */ 451 nodeoffset = fdt_find_or_add_subnode(blob, 0, "memory"); 452 if (nodeoffset < 0) 453 return nodeoffset; 454 455 err = fdt_setprop(blob, nodeoffset, "device_type", "memory", 456 sizeof("memory")); 457 if (err < 0) { 458 printf("WARNING: could not set %s %s.\n", "device_type", 459 fdt_strerror(err)); 460 return err; 461 } 462 463 if (!banks) 464 return 0; 465 466 len = fdt_pack_reg(blob, tmp, start, size, banks); 467 468 err = fdt_setprop(blob, nodeoffset, "reg", tmp, len); 469 if (err < 0) { 470 printf("WARNING: could not set %s %s.\n", 471 "reg", fdt_strerror(err)); 472 return err; 473 } 474 return 0; 475 } 476 477 int fdt_fixup_memory(void *blob, u64 start, u64 size) 478 { 479 return fdt_fixup_memory_banks(blob, &start, &size, 1); 480 } 481 482 void fdt_fixup_ethernet(void *fdt) 483 { 484 int node, i, j; 485 char enet[16], *tmp, *end; 486 char mac[16]; 487 const char *path; 488 unsigned char mac_addr[6]; 489 490 node = fdt_path_offset(fdt, "/aliases"); 491 if (node < 0) 492 return; 493 494 i = 0; 495 strcpy(mac, "ethaddr"); 496 while ((tmp = getenv(mac)) != NULL) { 497 sprintf(enet, "ethernet%d", i); 498 path = fdt_getprop(fdt, node, enet, NULL); 499 if (!path) { 500 debug("No alias for %s\n", enet); 501 sprintf(mac, "eth%daddr", ++i); 502 continue; 503 } 504 505 for (j = 0; j < 6; j++) { 506 mac_addr[j] = tmp ? simple_strtoul(tmp, &end, 16) : 0; 507 if (tmp) 508 tmp = (*end) ? end+1 : end; 509 } 510 511 do_fixup_by_path(fdt, path, "mac-address", &mac_addr, 6, 0); 512 do_fixup_by_path(fdt, path, "local-mac-address", 513 &mac_addr, 6, 1); 514 515 sprintf(mac, "eth%daddr", ++i); 516 } 517 } 518 519 /* Resize the fdt to its actual size + a bit of padding */ 520 int fdt_shrink_to_minimum(void *blob) 521 { 522 int i; 523 uint64_t addr, size; 524 int total, ret; 525 uint actualsize; 526 527 if (!blob) 528 return 0; 529 530 total = fdt_num_mem_rsv(blob); 531 for (i = 0; i < total; i++) { 532 fdt_get_mem_rsv(blob, i, &addr, &size); 533 if (addr == (uintptr_t)blob) { 534 fdt_del_mem_rsv(blob, i); 535 break; 536 } 537 } 538 539 /* 540 * Calculate the actual size of the fdt 541 * plus the size needed for 5 fdt_add_mem_rsv, one 542 * for the fdt itself and 4 for a possible initrd 543 * ((initrd-start + initrd-end) * 2 (name & value)) 544 */ 545 actualsize = fdt_off_dt_strings(blob) + 546 fdt_size_dt_strings(blob) + 5 * sizeof(struct fdt_reserve_entry); 547 548 /* Make it so the fdt ends on a page boundary */ 549 actualsize = ALIGN(actualsize + ((uintptr_t)blob & 0xfff), 0x1000); 550 actualsize = actualsize - ((uintptr_t)blob & 0xfff); 551 552 /* Change the fdt header to reflect the correct size */ 553 fdt_set_totalsize(blob, actualsize); 554 555 /* Add the new reservation */ 556 ret = fdt_add_mem_rsv(blob, (uintptr_t)blob, actualsize); 557 if (ret < 0) 558 return ret; 559 560 return actualsize; 561 } 562 563 #ifdef CONFIG_PCI 564 #define CONFIG_SYS_PCI_NR_INBOUND_WIN 4 565 566 #define FDT_PCI_PREFETCH (0x40000000) 567 #define FDT_PCI_MEM32 (0x02000000) 568 #define FDT_PCI_IO (0x01000000) 569 #define FDT_PCI_MEM64 (0x03000000) 570 571 int fdt_pci_dma_ranges(void *blob, int phb_off, struct pci_controller *hose) { 572 573 int addrcell, sizecell, len, r; 574 u32 *dma_range; 575 /* sized based on pci addr cells, size-cells, & address-cells */ 576 u32 dma_ranges[(3 + 2 + 2) * CONFIG_SYS_PCI_NR_INBOUND_WIN]; 577 578 addrcell = fdt_getprop_u32_default(blob, "/", "#address-cells", 1); 579 sizecell = fdt_getprop_u32_default(blob, "/", "#size-cells", 1); 580 581 dma_range = &dma_ranges[0]; 582 for (r = 0; r < hose->region_count; r++) { 583 u64 bus_start, phys_start, size; 584 585 /* skip if !PCI_REGION_SYS_MEMORY */ 586 if (!(hose->regions[r].flags & PCI_REGION_SYS_MEMORY)) 587 continue; 588 589 bus_start = (u64)hose->regions[r].bus_start; 590 phys_start = (u64)hose->regions[r].phys_start; 591 size = (u64)hose->regions[r].size; 592 593 dma_range[0] = 0; 594 if (size >= 0x100000000ull) 595 dma_range[0] |= FDT_PCI_MEM64; 596 else 597 dma_range[0] |= FDT_PCI_MEM32; 598 if (hose->regions[r].flags & PCI_REGION_PREFETCH) 599 dma_range[0] |= FDT_PCI_PREFETCH; 600 #ifdef CONFIG_SYS_PCI_64BIT 601 dma_range[1] = bus_start >> 32; 602 #else 603 dma_range[1] = 0; 604 #endif 605 dma_range[2] = bus_start & 0xffffffff; 606 607 if (addrcell == 2) { 608 dma_range[3] = phys_start >> 32; 609 dma_range[4] = phys_start & 0xffffffff; 610 } else { 611 dma_range[3] = phys_start & 0xffffffff; 612 } 613 614 if (sizecell == 2) { 615 dma_range[3 + addrcell + 0] = size >> 32; 616 dma_range[3 + addrcell + 1] = size & 0xffffffff; 617 } else { 618 dma_range[3 + addrcell + 0] = size & 0xffffffff; 619 } 620 621 dma_range += (3 + addrcell + sizecell); 622 } 623 624 len = dma_range - &dma_ranges[0]; 625 if (len) 626 fdt_setprop(blob, phb_off, "dma-ranges", &dma_ranges[0], len*4); 627 628 return 0; 629 } 630 #endif 631 632 #ifdef CONFIG_FDT_FIXUP_NOR_FLASH_SIZE 633 /* 634 * Provide a weak default function to return the flash bank size. 635 * There might be multiple non-identical flash chips connected to one 636 * chip-select, so we need to pass an index as well. 637 */ 638 u32 __flash_get_bank_size(int cs, int idx) 639 { 640 extern flash_info_t flash_info[]; 641 642 /* 643 * As default, a simple 1:1 mapping is provided. Boards with 644 * a different mapping need to supply a board specific mapping 645 * routine. 646 */ 647 return flash_info[cs].size; 648 } 649 u32 flash_get_bank_size(int cs, int idx) 650 __attribute__((weak, alias("__flash_get_bank_size"))); 651 652 /* 653 * This function can be used to update the size in the "reg" property 654 * of all NOR FLASH device nodes. This is necessary for boards with 655 * non-fixed NOR FLASH sizes. 656 */ 657 int fdt_fixup_nor_flash_size(void *blob) 658 { 659 char compat[][16] = { "cfi-flash", "jedec-flash" }; 660 int off; 661 int len; 662 struct fdt_property *prop; 663 u32 *reg, *reg2; 664 int i; 665 666 for (i = 0; i < 2; i++) { 667 off = fdt_node_offset_by_compatible(blob, -1, compat[i]); 668 while (off != -FDT_ERR_NOTFOUND) { 669 int idx; 670 671 /* 672 * Found one compatible node, so fixup the size 673 * int its reg properties 674 */ 675 prop = fdt_get_property_w(blob, off, "reg", &len); 676 if (prop) { 677 int tuple_size = 3 * sizeof(reg); 678 679 /* 680 * There might be multiple reg-tuples, 681 * so loop through them all 682 */ 683 reg = reg2 = (u32 *)&prop->data[0]; 684 for (idx = 0; idx < (len / tuple_size); idx++) { 685 /* 686 * Update size in reg property 687 */ 688 reg[2] = flash_get_bank_size(reg[0], 689 idx); 690 691 /* 692 * Point to next reg tuple 693 */ 694 reg += 3; 695 } 696 697 fdt_setprop(blob, off, "reg", reg2, len); 698 } 699 700 /* Move to next compatible node */ 701 off = fdt_node_offset_by_compatible(blob, off, 702 compat[i]); 703 } 704 } 705 706 return 0; 707 } 708 #endif 709 710 int fdt_increase_size(void *fdt, int add_len) 711 { 712 int newlen; 713 714 newlen = fdt_totalsize(fdt) + add_len; 715 716 /* Open in place with a new len */ 717 return fdt_open_into(fdt, fdt, newlen); 718 } 719 720 #ifdef CONFIG_FDT_FIXUP_PARTITIONS 721 #include <jffs2/load_kernel.h> 722 #include <mtd_node.h> 723 724 struct reg_cell { 725 unsigned int r0; 726 unsigned int r1; 727 }; 728 729 int fdt_del_subnodes(const void *blob, int parent_offset) 730 { 731 int off, ndepth; 732 int ret; 733 734 for (ndepth = 0, off = fdt_next_node(blob, parent_offset, &ndepth); 735 (off >= 0) && (ndepth > 0); 736 off = fdt_next_node(blob, off, &ndepth)) { 737 if (ndepth == 1) { 738 debug("delete %s: offset: %x\n", 739 fdt_get_name(blob, off, 0), off); 740 ret = fdt_del_node((void *)blob, off); 741 if (ret < 0) { 742 printf("Can't delete node: %s\n", 743 fdt_strerror(ret)); 744 return ret; 745 } else { 746 ndepth = 0; 747 off = parent_offset; 748 } 749 } 750 } 751 return 0; 752 } 753 754 int fdt_del_partitions(void *blob, int parent_offset) 755 { 756 const void *prop; 757 int ndepth = 0; 758 int off; 759 int ret; 760 761 off = fdt_next_node(blob, parent_offset, &ndepth); 762 if (off > 0 && ndepth == 1) { 763 prop = fdt_getprop(blob, off, "label", NULL); 764 if (prop == NULL) { 765 /* 766 * Could not find label property, nand {}; node? 767 * Check subnode, delete partitions there if any. 768 */ 769 return fdt_del_partitions(blob, off); 770 } else { 771 ret = fdt_del_subnodes(blob, parent_offset); 772 if (ret < 0) { 773 printf("Can't remove subnodes: %s\n", 774 fdt_strerror(ret)); 775 return ret; 776 } 777 } 778 } 779 return 0; 780 } 781 782 int fdt_node_set_part_info(void *blob, int parent_offset, 783 struct mtd_device *dev) 784 { 785 struct list_head *pentry; 786 struct part_info *part; 787 struct reg_cell cell; 788 int off, ndepth = 0; 789 int part_num, ret; 790 char buf[64]; 791 792 ret = fdt_del_partitions(blob, parent_offset); 793 if (ret < 0) 794 return ret; 795 796 /* 797 * Check if it is nand {}; subnode, adjust 798 * the offset in this case 799 */ 800 off = fdt_next_node(blob, parent_offset, &ndepth); 801 if (off > 0 && ndepth == 1) 802 parent_offset = off; 803 804 part_num = 0; 805 list_for_each_prev(pentry, &dev->parts) { 806 int newoff; 807 808 part = list_entry(pentry, struct part_info, link); 809 810 debug("%2d: %-20s0x%08llx\t0x%08llx\t%d\n", 811 part_num, part->name, part->size, 812 part->offset, part->mask_flags); 813 814 sprintf(buf, "partition@%llx", part->offset); 815 add_sub: 816 ret = fdt_add_subnode(blob, parent_offset, buf); 817 if (ret == -FDT_ERR_NOSPACE) { 818 ret = fdt_increase_size(blob, 512); 819 if (!ret) 820 goto add_sub; 821 else 822 goto err_size; 823 } else if (ret < 0) { 824 printf("Can't add partition node: %s\n", 825 fdt_strerror(ret)); 826 return ret; 827 } 828 newoff = ret; 829 830 /* Check MTD_WRITEABLE_CMD flag */ 831 if (part->mask_flags & 1) { 832 add_ro: 833 ret = fdt_setprop(blob, newoff, "read_only", NULL, 0); 834 if (ret == -FDT_ERR_NOSPACE) { 835 ret = fdt_increase_size(blob, 512); 836 if (!ret) 837 goto add_ro; 838 else 839 goto err_size; 840 } else if (ret < 0) 841 goto err_prop; 842 } 843 844 cell.r0 = cpu_to_fdt32(part->offset); 845 cell.r1 = cpu_to_fdt32(part->size); 846 add_reg: 847 ret = fdt_setprop(blob, newoff, "reg", &cell, sizeof(cell)); 848 if (ret == -FDT_ERR_NOSPACE) { 849 ret = fdt_increase_size(blob, 512); 850 if (!ret) 851 goto add_reg; 852 else 853 goto err_size; 854 } else if (ret < 0) 855 goto err_prop; 856 857 add_label: 858 ret = fdt_setprop_string(blob, newoff, "label", part->name); 859 if (ret == -FDT_ERR_NOSPACE) { 860 ret = fdt_increase_size(blob, 512); 861 if (!ret) 862 goto add_label; 863 else 864 goto err_size; 865 } else if (ret < 0) 866 goto err_prop; 867 868 part_num++; 869 } 870 return 0; 871 err_size: 872 printf("Can't increase blob size: %s\n", fdt_strerror(ret)); 873 return ret; 874 err_prop: 875 printf("Can't add property: %s\n", fdt_strerror(ret)); 876 return ret; 877 } 878 879 /* 880 * Update partitions in nor/nand nodes using info from 881 * mtdparts environment variable. The nodes to update are 882 * specified by node_info structure which contains mtd device 883 * type and compatible string: E. g. the board code in 884 * ft_board_setup() could use: 885 * 886 * struct node_info nodes[] = { 887 * { "fsl,mpc5121-nfc", MTD_DEV_TYPE_NAND, }, 888 * { "cfi-flash", MTD_DEV_TYPE_NOR, }, 889 * }; 890 * 891 * fdt_fixup_mtdparts(blob, nodes, ARRAY_SIZE(nodes)); 892 */ 893 void fdt_fixup_mtdparts(void *blob, void *node_info, int node_info_size) 894 { 895 struct node_info *ni = node_info; 896 struct mtd_device *dev; 897 char *parts; 898 int i, idx; 899 int noff; 900 901 parts = getenv("mtdparts"); 902 if (!parts) 903 return; 904 905 if (mtdparts_init() != 0) 906 return; 907 908 for (i = 0; i < node_info_size; i++) { 909 idx = 0; 910 noff = fdt_node_offset_by_compatible(blob, -1, ni[i].compat); 911 while (noff != -FDT_ERR_NOTFOUND) { 912 debug("%s: %s, mtd dev type %d\n", 913 fdt_get_name(blob, noff, 0), 914 ni[i].compat, ni[i].type); 915 dev = device_find(ni[i].type, idx++); 916 if (dev) { 917 if (fdt_node_set_part_info(blob, noff, dev)) 918 return; /* return on error */ 919 } 920 921 /* Jump to next flash node */ 922 noff = fdt_node_offset_by_compatible(blob, noff, 923 ni[i].compat); 924 } 925 } 926 } 927 #endif 928 929 void fdt_del_node_and_alias(void *blob, const char *alias) 930 { 931 int off = fdt_path_offset(blob, alias); 932 933 if (off < 0) 934 return; 935 936 fdt_del_node(blob, off); 937 938 off = fdt_path_offset(blob, "/aliases"); 939 fdt_delprop(blob, off, alias); 940 } 941 942 /* Max address size we deal with */ 943 #define OF_MAX_ADDR_CELLS 4 944 #define OF_BAD_ADDR FDT_ADDR_T_NONE 945 #define OF_CHECK_COUNTS(na, ns) ((na) > 0 && (na) <= OF_MAX_ADDR_CELLS && \ 946 (ns) > 0) 947 948 /* Debug utility */ 949 #ifdef DEBUG 950 static void of_dump_addr(const char *s, const fdt32_t *addr, int na) 951 { 952 printf("%s", s); 953 while(na--) 954 printf(" %08x", *(addr++)); 955 printf("\n"); 956 } 957 #else 958 static void of_dump_addr(const char *s, const fdt32_t *addr, int na) { } 959 #endif 960 961 /* Callbacks for bus specific translators */ 962 struct of_bus { 963 const char *name; 964 const char *addresses; 965 void (*count_cells)(void *blob, int parentoffset, 966 int *addrc, int *sizec); 967 u64 (*map)(fdt32_t *addr, const fdt32_t *range, 968 int na, int ns, int pna); 969 int (*translate)(fdt32_t *addr, u64 offset, int na); 970 }; 971 972 /* Default translator (generic bus) */ 973 void of_bus_default_count_cells(void *blob, int parentoffset, 974 int *addrc, int *sizec) 975 { 976 const fdt32_t *prop; 977 978 if (addrc) 979 *addrc = fdt_address_cells(blob, parentoffset); 980 981 if (sizec) { 982 prop = fdt_getprop(blob, parentoffset, "#size-cells", NULL); 983 if (prop) 984 *sizec = be32_to_cpup(prop); 985 else 986 *sizec = 1; 987 } 988 } 989 990 static u64 of_bus_default_map(fdt32_t *addr, const fdt32_t *range, 991 int na, int ns, int pna) 992 { 993 u64 cp, s, da; 994 995 cp = of_read_number(range, na); 996 s = of_read_number(range + na + pna, ns); 997 da = of_read_number(addr, na); 998 999 debug("OF: default map, cp=%" PRIu64 ", s=%" PRIu64 1000 ", da=%" PRIu64 "\n", cp, s, da); 1001 1002 if (da < cp || da >= (cp + s)) 1003 return OF_BAD_ADDR; 1004 return da - cp; 1005 } 1006 1007 static int of_bus_default_translate(fdt32_t *addr, u64 offset, int na) 1008 { 1009 u64 a = of_read_number(addr, na); 1010 memset(addr, 0, na * 4); 1011 a += offset; 1012 if (na > 1) 1013 addr[na - 2] = cpu_to_fdt32(a >> 32); 1014 addr[na - 1] = cpu_to_fdt32(a & 0xffffffffu); 1015 1016 return 0; 1017 } 1018 1019 /* Array of bus specific translators */ 1020 static struct of_bus of_busses[] = { 1021 /* Default */ 1022 { 1023 .name = "default", 1024 .addresses = "reg", 1025 .count_cells = of_bus_default_count_cells, 1026 .map = of_bus_default_map, 1027 .translate = of_bus_default_translate, 1028 }, 1029 }; 1030 1031 static int of_translate_one(void * blob, int parent, struct of_bus *bus, 1032 struct of_bus *pbus, fdt32_t *addr, 1033 int na, int ns, int pna, const char *rprop) 1034 { 1035 const fdt32_t *ranges; 1036 int rlen; 1037 int rone; 1038 u64 offset = OF_BAD_ADDR; 1039 1040 /* Normally, an absence of a "ranges" property means we are 1041 * crossing a non-translatable boundary, and thus the addresses 1042 * below the current not cannot be converted to CPU physical ones. 1043 * Unfortunately, while this is very clear in the spec, it's not 1044 * what Apple understood, and they do have things like /uni-n or 1045 * /ht nodes with no "ranges" property and a lot of perfectly 1046 * useable mapped devices below them. Thus we treat the absence of 1047 * "ranges" as equivalent to an empty "ranges" property which means 1048 * a 1:1 translation at that level. It's up to the caller not to try 1049 * to translate addresses that aren't supposed to be translated in 1050 * the first place. --BenH. 1051 */ 1052 ranges = fdt_getprop(blob, parent, rprop, &rlen); 1053 if (ranges == NULL || rlen == 0) { 1054 offset = of_read_number(addr, na); 1055 memset(addr, 0, pna * 4); 1056 debug("OF: no ranges, 1:1 translation\n"); 1057 goto finish; 1058 } 1059 1060 debug("OF: walking ranges...\n"); 1061 1062 /* Now walk through the ranges */ 1063 rlen /= 4; 1064 rone = na + pna + ns; 1065 for (; rlen >= rone; rlen -= rone, ranges += rone) { 1066 offset = bus->map(addr, ranges, na, ns, pna); 1067 if (offset != OF_BAD_ADDR) 1068 break; 1069 } 1070 if (offset == OF_BAD_ADDR) { 1071 debug("OF: not found !\n"); 1072 return 1; 1073 } 1074 memcpy(addr, ranges + na, 4 * pna); 1075 1076 finish: 1077 of_dump_addr("OF: parent translation for:", addr, pna); 1078 debug("OF: with offset: %" PRIu64 "\n", offset); 1079 1080 /* Translate it into parent bus space */ 1081 return pbus->translate(addr, offset, pna); 1082 } 1083 1084 /* 1085 * Translate an address from the device-tree into a CPU physical address, 1086 * this walks up the tree and applies the various bus mappings on the 1087 * way. 1088 * 1089 * Note: We consider that crossing any level with #size-cells == 0 to mean 1090 * that translation is impossible (that is we are not dealing with a value 1091 * that can be mapped to a cpu physical address). This is not really specified 1092 * that way, but this is traditionally the way IBM at least do things 1093 */ 1094 static u64 __of_translate_address(void *blob, int node_offset, const fdt32_t *in_addr, 1095 const char *rprop) 1096 { 1097 int parent; 1098 struct of_bus *bus, *pbus; 1099 fdt32_t addr[OF_MAX_ADDR_CELLS]; 1100 int na, ns, pna, pns; 1101 u64 result = OF_BAD_ADDR; 1102 1103 debug("OF: ** translation for device %s **\n", 1104 fdt_get_name(blob, node_offset, NULL)); 1105 1106 /* Get parent & match bus type */ 1107 parent = fdt_parent_offset(blob, node_offset); 1108 if (parent < 0) 1109 goto bail; 1110 bus = &of_busses[0]; 1111 1112 /* Cound address cells & copy address locally */ 1113 bus->count_cells(blob, parent, &na, &ns); 1114 if (!OF_CHECK_COUNTS(na, ns)) { 1115 printf("%s: Bad cell count for %s\n", __FUNCTION__, 1116 fdt_get_name(blob, node_offset, NULL)); 1117 goto bail; 1118 } 1119 memcpy(addr, in_addr, na * 4); 1120 1121 debug("OF: bus is %s (na=%d, ns=%d) on %s\n", 1122 bus->name, na, ns, fdt_get_name(blob, parent, NULL)); 1123 of_dump_addr("OF: translating address:", addr, na); 1124 1125 /* Translate */ 1126 for (;;) { 1127 /* Switch to parent bus */ 1128 node_offset = parent; 1129 parent = fdt_parent_offset(blob, node_offset); 1130 1131 /* If root, we have finished */ 1132 if (parent < 0) { 1133 debug("OF: reached root node\n"); 1134 result = of_read_number(addr, na); 1135 break; 1136 } 1137 1138 /* Get new parent bus and counts */ 1139 pbus = &of_busses[0]; 1140 pbus->count_cells(blob, parent, &pna, &pns); 1141 if (!OF_CHECK_COUNTS(pna, pns)) { 1142 printf("%s: Bad cell count for %s\n", __FUNCTION__, 1143 fdt_get_name(blob, node_offset, NULL)); 1144 break; 1145 } 1146 1147 debug("OF: parent bus is %s (na=%d, ns=%d) on %s\n", 1148 pbus->name, pna, pns, fdt_get_name(blob, parent, NULL)); 1149 1150 /* Apply bus translation */ 1151 if (of_translate_one(blob, node_offset, bus, pbus, 1152 addr, na, ns, pna, rprop)) 1153 break; 1154 1155 /* Complete the move up one level */ 1156 na = pna; 1157 ns = pns; 1158 bus = pbus; 1159 1160 of_dump_addr("OF: one level translation:", addr, na); 1161 } 1162 bail: 1163 1164 return result; 1165 } 1166 1167 u64 fdt_translate_address(void *blob, int node_offset, const fdt32_t *in_addr) 1168 { 1169 return __of_translate_address(blob, node_offset, in_addr, "ranges"); 1170 } 1171 1172 /** 1173 * fdt_node_offset_by_compat_reg: Find a node that matches compatiable and 1174 * who's reg property matches a physical cpu address 1175 * 1176 * @blob: ptr to device tree 1177 * @compat: compatiable string to match 1178 * @compat_off: property name 1179 * 1180 */ 1181 int fdt_node_offset_by_compat_reg(void *blob, const char *compat, 1182 phys_addr_t compat_off) 1183 { 1184 int len, off = fdt_node_offset_by_compatible(blob, -1, compat); 1185 while (off != -FDT_ERR_NOTFOUND) { 1186 const fdt32_t *reg = fdt_getprop(blob, off, "reg", &len); 1187 if (reg) { 1188 if (compat_off == fdt_translate_address(blob, off, reg)) 1189 return off; 1190 } 1191 off = fdt_node_offset_by_compatible(blob, off, compat); 1192 } 1193 1194 return -FDT_ERR_NOTFOUND; 1195 } 1196 1197 /** 1198 * fdt_alloc_phandle: Return next free phandle value 1199 * 1200 * @blob: ptr to device tree 1201 */ 1202 int fdt_alloc_phandle(void *blob) 1203 { 1204 int offset; 1205 uint32_t phandle = 0; 1206 1207 for (offset = fdt_next_node(blob, -1, NULL); offset >= 0; 1208 offset = fdt_next_node(blob, offset, NULL)) { 1209 phandle = max(phandle, fdt_get_phandle(blob, offset)); 1210 } 1211 1212 return phandle + 1; 1213 } 1214 1215 /* 1216 * fdt_set_phandle: Create a phandle property for the given node 1217 * 1218 * @fdt: ptr to device tree 1219 * @nodeoffset: node to update 1220 * @phandle: phandle value to set (must be unique) 1221 */ 1222 int fdt_set_phandle(void *fdt, int nodeoffset, uint32_t phandle) 1223 { 1224 int ret; 1225 1226 #ifdef DEBUG 1227 int off = fdt_node_offset_by_phandle(fdt, phandle); 1228 1229 if ((off >= 0) && (off != nodeoffset)) { 1230 char buf[64]; 1231 1232 fdt_get_path(fdt, nodeoffset, buf, sizeof(buf)); 1233 printf("Trying to update node %s with phandle %u ", 1234 buf, phandle); 1235 1236 fdt_get_path(fdt, off, buf, sizeof(buf)); 1237 printf("that already exists in node %s.\n", buf); 1238 return -FDT_ERR_BADPHANDLE; 1239 } 1240 #endif 1241 1242 ret = fdt_setprop_cell(fdt, nodeoffset, "phandle", phandle); 1243 if (ret < 0) 1244 return ret; 1245 1246 /* 1247 * For now, also set the deprecated "linux,phandle" property, so that we 1248 * don't break older kernels. 1249 */ 1250 ret = fdt_setprop_cell(fdt, nodeoffset, "linux,phandle", phandle); 1251 1252 return ret; 1253 } 1254 1255 /* 1256 * fdt_create_phandle: Create a phandle property for the given node 1257 * 1258 * @fdt: ptr to device tree 1259 * @nodeoffset: node to update 1260 */ 1261 unsigned int fdt_create_phandle(void *fdt, int nodeoffset) 1262 { 1263 /* see if there is a phandle already */ 1264 int phandle = fdt_get_phandle(fdt, nodeoffset); 1265 1266 /* if we got 0, means no phandle so create one */ 1267 if (phandle == 0) { 1268 int ret; 1269 1270 phandle = fdt_alloc_phandle(fdt); 1271 ret = fdt_set_phandle(fdt, nodeoffset, phandle); 1272 if (ret < 0) { 1273 printf("Can't set phandle %u: %s\n", phandle, 1274 fdt_strerror(ret)); 1275 return 0; 1276 } 1277 } 1278 1279 return phandle; 1280 } 1281 1282 /* 1283 * fdt_set_node_status: Set status for the given node 1284 * 1285 * @fdt: ptr to device tree 1286 * @nodeoffset: node to update 1287 * @status: FDT_STATUS_OKAY, FDT_STATUS_DISABLED, 1288 * FDT_STATUS_FAIL, FDT_STATUS_FAIL_ERROR_CODE 1289 * @error_code: optional, only used if status is FDT_STATUS_FAIL_ERROR_CODE 1290 */ 1291 int fdt_set_node_status(void *fdt, int nodeoffset, 1292 enum fdt_status status, unsigned int error_code) 1293 { 1294 char buf[16]; 1295 int ret = 0; 1296 1297 if (nodeoffset < 0) 1298 return nodeoffset; 1299 1300 switch (status) { 1301 case FDT_STATUS_OKAY: 1302 ret = fdt_setprop_string(fdt, nodeoffset, "status", "okay"); 1303 break; 1304 case FDT_STATUS_DISABLED: 1305 ret = fdt_setprop_string(fdt, nodeoffset, "status", "disabled"); 1306 break; 1307 case FDT_STATUS_FAIL: 1308 ret = fdt_setprop_string(fdt, nodeoffset, "status", "fail"); 1309 break; 1310 case FDT_STATUS_FAIL_ERROR_CODE: 1311 sprintf(buf, "fail-%d", error_code); 1312 ret = fdt_setprop_string(fdt, nodeoffset, "status", buf); 1313 break; 1314 default: 1315 printf("Invalid fdt status: %x\n", status); 1316 ret = -1; 1317 break; 1318 } 1319 1320 return ret; 1321 } 1322 1323 /* 1324 * fdt_set_status_by_alias: Set status for the given node given an alias 1325 * 1326 * @fdt: ptr to device tree 1327 * @alias: alias of node to update 1328 * @status: FDT_STATUS_OKAY, FDT_STATUS_DISABLED, 1329 * FDT_STATUS_FAIL, FDT_STATUS_FAIL_ERROR_CODE 1330 * @error_code: optional, only used if status is FDT_STATUS_FAIL_ERROR_CODE 1331 */ 1332 int fdt_set_status_by_alias(void *fdt, const char* alias, 1333 enum fdt_status status, unsigned int error_code) 1334 { 1335 int offset = fdt_path_offset(fdt, alias); 1336 1337 return fdt_set_node_status(fdt, offset, status, error_code); 1338 } 1339 1340 #if defined(CONFIG_VIDEO) || defined(CONFIG_LCD) 1341 int fdt_add_edid(void *blob, const char *compat, unsigned char *edid_buf) 1342 { 1343 int noff; 1344 int ret; 1345 1346 noff = fdt_node_offset_by_compatible(blob, -1, compat); 1347 if (noff != -FDT_ERR_NOTFOUND) { 1348 debug("%s: %s\n", fdt_get_name(blob, noff, 0), compat); 1349 add_edid: 1350 ret = fdt_setprop(blob, noff, "edid", edid_buf, 128); 1351 if (ret == -FDT_ERR_NOSPACE) { 1352 ret = fdt_increase_size(blob, 512); 1353 if (!ret) 1354 goto add_edid; 1355 else 1356 goto err_size; 1357 } else if (ret < 0) { 1358 printf("Can't add property: %s\n", fdt_strerror(ret)); 1359 return ret; 1360 } 1361 } 1362 return 0; 1363 err_size: 1364 printf("Can't increase blob size: %s\n", fdt_strerror(ret)); 1365 return ret; 1366 } 1367 #endif 1368 1369 /* 1370 * Verify the physical address of device tree node for a given alias 1371 * 1372 * This function locates the device tree node of a given alias, and then 1373 * verifies that the physical address of that device matches the given 1374 * parameter. It displays a message if there is a mismatch. 1375 * 1376 * Returns 1 on success, 0 on failure 1377 */ 1378 int fdt_verify_alias_address(void *fdt, int anode, const char *alias, u64 addr) 1379 { 1380 const char *path; 1381 const fdt32_t *reg; 1382 int node, len; 1383 u64 dt_addr; 1384 1385 path = fdt_getprop(fdt, anode, alias, NULL); 1386 if (!path) { 1387 /* If there's no such alias, then it's not a failure */ 1388 return 1; 1389 } 1390 1391 node = fdt_path_offset(fdt, path); 1392 if (node < 0) { 1393 printf("Warning: device tree alias '%s' points to invalid " 1394 "node %s.\n", alias, path); 1395 return 0; 1396 } 1397 1398 reg = fdt_getprop(fdt, node, "reg", &len); 1399 if (!reg) { 1400 printf("Warning: device tree node '%s' has no address.\n", 1401 path); 1402 return 0; 1403 } 1404 1405 dt_addr = fdt_translate_address(fdt, node, reg); 1406 if (addr != dt_addr) { 1407 printf("Warning: U-Boot configured device %s at address %" 1408 PRIx64 ",\n but the device tree has it address %" 1409 PRIx64 ".\n", alias, addr, dt_addr); 1410 return 0; 1411 } 1412 1413 return 1; 1414 } 1415 1416 /* 1417 * Returns the base address of an SOC or PCI node 1418 */ 1419 u64 fdt_get_base_address(void *fdt, int node) 1420 { 1421 int size; 1422 u32 naddr; 1423 const fdt32_t *prop; 1424 1425 naddr = fdt_address_cells(fdt, node); 1426 1427 prop = fdt_getprop(fdt, node, "ranges", &size); 1428 1429 return prop ? fdt_translate_address(fdt, node, prop + naddr) : 0; 1430 } 1431 1432 /* 1433 * Read a property of size <prop_len>. Currently only supports 1 or 2 cells. 1434 */ 1435 static int fdt_read_prop(const fdt32_t *prop, int prop_len, int cell_off, 1436 uint64_t *val, int cells) 1437 { 1438 const fdt32_t *prop32 = &prop[cell_off]; 1439 const fdt64_t *prop64 = (const fdt64_t *)&prop[cell_off]; 1440 1441 if ((cell_off + cells) > prop_len) 1442 return -FDT_ERR_NOSPACE; 1443 1444 switch (cells) { 1445 case 1: 1446 *val = fdt32_to_cpu(*prop32); 1447 break; 1448 case 2: 1449 *val = fdt64_to_cpu(*prop64); 1450 break; 1451 default: 1452 return -FDT_ERR_NOSPACE; 1453 } 1454 1455 return 0; 1456 } 1457 1458 /** 1459 * fdt_read_range - Read a node's n'th range property 1460 * 1461 * @fdt: ptr to device tree 1462 * @node: offset of node 1463 * @n: range index 1464 * @child_addr: pointer to storage for the "child address" field 1465 * @addr: pointer to storage for the CPU view translated physical start 1466 * @len: pointer to storage for the range length 1467 * 1468 * Convenience function that reads and interprets a specific range out of 1469 * a number of the "ranges" property array. 1470 */ 1471 int fdt_read_range(void *fdt, int node, int n, uint64_t *child_addr, 1472 uint64_t *addr, uint64_t *len) 1473 { 1474 int pnode = fdt_parent_offset(fdt, node); 1475 const fdt32_t *ranges; 1476 int pacells; 1477 int acells; 1478 int scells; 1479 int ranges_len; 1480 int cell = 0; 1481 int r = 0; 1482 1483 /* 1484 * The "ranges" property is an array of 1485 * { <child address> <parent address> <size in child address space> } 1486 * 1487 * All 3 elements can span a diffent number of cells. Fetch their size. 1488 */ 1489 pacells = fdt_getprop_u32_default_node(fdt, pnode, 0, "#address-cells", 1); 1490 acells = fdt_getprop_u32_default_node(fdt, node, 0, "#address-cells", 1); 1491 scells = fdt_getprop_u32_default_node(fdt, node, 0, "#size-cells", 1); 1492 1493 /* Now try to get the ranges property */ 1494 ranges = fdt_getprop(fdt, node, "ranges", &ranges_len); 1495 if (!ranges) 1496 return -FDT_ERR_NOTFOUND; 1497 ranges_len /= sizeof(uint32_t); 1498 1499 /* Jump to the n'th entry */ 1500 cell = n * (pacells + acells + scells); 1501 1502 /* Read <child address> */ 1503 if (child_addr) { 1504 r = fdt_read_prop(ranges, ranges_len, cell, child_addr, 1505 acells); 1506 if (r) 1507 return r; 1508 } 1509 cell += acells; 1510 1511 /* Read <parent address> */ 1512 if (addr) 1513 *addr = fdt_translate_address(fdt, node, ranges + cell); 1514 cell += pacells; 1515 1516 /* Read <size in child address space> */ 1517 if (len) { 1518 r = fdt_read_prop(ranges, ranges_len, cell, len, scells); 1519 if (r) 1520 return r; 1521 } 1522 1523 return 0; 1524 } 1525 1526 /** 1527 * fdt_setup_simplefb_node - Fill and enable a simplefb node 1528 * 1529 * @fdt: ptr to device tree 1530 * @node: offset of the simplefb node 1531 * @base_address: framebuffer base address 1532 * @width: width in pixels 1533 * @height: height in pixels 1534 * @stride: bytes per line 1535 * @format: pixel format string 1536 * 1537 * Convenience function to fill and enable a simplefb node. 1538 */ 1539 int fdt_setup_simplefb_node(void *fdt, int node, u64 base_address, u32 width, 1540 u32 height, u32 stride, const char *format) 1541 { 1542 char name[32]; 1543 fdt32_t cells[4]; 1544 int i, addrc, sizec, ret; 1545 1546 of_bus_default_count_cells(fdt, fdt_parent_offset(fdt, node), 1547 &addrc, &sizec); 1548 i = 0; 1549 if (addrc == 2) 1550 cells[i++] = cpu_to_fdt32(base_address >> 32); 1551 cells[i++] = cpu_to_fdt32(base_address); 1552 if (sizec == 2) 1553 cells[i++] = 0; 1554 cells[i++] = cpu_to_fdt32(height * stride); 1555 1556 ret = fdt_setprop(fdt, node, "reg", cells, sizeof(cells[0]) * i); 1557 if (ret < 0) 1558 return ret; 1559 1560 snprintf(name, sizeof(name), "framebuffer@%" PRIx64, base_address); 1561 ret = fdt_set_name(fdt, node, name); 1562 if (ret < 0) 1563 return ret; 1564 1565 ret = fdt_setprop_u32(fdt, node, "width", width); 1566 if (ret < 0) 1567 return ret; 1568 1569 ret = fdt_setprop_u32(fdt, node, "height", height); 1570 if (ret < 0) 1571 return ret; 1572 1573 ret = fdt_setprop_u32(fdt, node, "stride", stride); 1574 if (ret < 0) 1575 return ret; 1576 1577 ret = fdt_setprop_string(fdt, node, "format", format); 1578 if (ret < 0) 1579 return ret; 1580 1581 ret = fdt_setprop_string(fdt, node, "status", "okay"); 1582 if (ret < 0) 1583 return ret; 1584 1585 return 0; 1586 } 1587 1588 /* 1589 * Update native-mode in display-timings from display environment variable. 1590 * The node to update are specified by path. 1591 */ 1592 int fdt_fixup_display(void *blob, const char *path, const char *display) 1593 { 1594 int off, toff; 1595 1596 if (!display || !path) 1597 return -FDT_ERR_NOTFOUND; 1598 1599 toff = fdt_path_offset(blob, path); 1600 if (toff >= 0) 1601 toff = fdt_subnode_offset(blob, toff, "display-timings"); 1602 if (toff < 0) 1603 return toff; 1604 1605 for (off = fdt_first_subnode(blob, toff); 1606 off >= 0; 1607 off = fdt_next_subnode(blob, off)) { 1608 uint32_t h = fdt_get_phandle(blob, off); 1609 debug("%s:0x%x\n", fdt_get_name(blob, off, NULL), 1610 fdt32_to_cpu(h)); 1611 if (strcasecmp(fdt_get_name(blob, off, NULL), display) == 0) 1612 return fdt_setprop_u32(blob, toff, "native-mode", h); 1613 } 1614 return toff; 1615 } 1616