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 int fdt_fixup_stdout(void *fdt, int chosenoff) 135 { 136 int err; 137 int aliasoff; 138 char sername[9] = { 0 }; 139 const void *path; 140 int len; 141 char tmp[256]; /* long enough */ 142 143 sprintf(sername, "serial%d", CONFIG_CONS_INDEX - 1); 144 145 aliasoff = fdt_path_offset(fdt, "/aliases"); 146 if (aliasoff < 0) { 147 err = aliasoff; 148 goto noalias; 149 } 150 151 path = fdt_getprop(fdt, aliasoff, sername, &len); 152 if (!path) { 153 err = len; 154 goto noalias; 155 } 156 157 /* fdt_setprop may break "path" so we copy it to tmp buffer */ 158 memcpy(tmp, path, len); 159 160 err = fdt_setprop(fdt, chosenoff, "linux,stdout-path", tmp, len); 161 if (err < 0) 162 printf("WARNING: could not set linux,stdout-path %s.\n", 163 fdt_strerror(err)); 164 165 return err; 166 167 noalias: 168 printf("WARNING: %s: could not read %s alias: %s\n", 169 __func__, sername, fdt_strerror(err)); 170 171 return 0; 172 } 173 #else 174 static int fdt_fixup_stdout(void *fdt, int chosenoff) 175 { 176 return 0; 177 } 178 #endif 179 180 static inline int fdt_setprop_uxx(void *fdt, int nodeoffset, const char *name, 181 uint64_t val, int is_u64) 182 { 183 if (is_u64) 184 return fdt_setprop_u64(fdt, nodeoffset, name, val); 185 else 186 return fdt_setprop_u32(fdt, nodeoffset, name, (uint32_t)val); 187 } 188 189 int fdt_root(void *fdt) 190 { 191 char *serial; 192 int err; 193 194 err = fdt_check_header(fdt); 195 if (err < 0) { 196 printf("fdt_root: %s\n", fdt_strerror(err)); 197 return err; 198 } 199 200 serial = env_get("serial#"); 201 if (serial) { 202 err = fdt_setprop(fdt, 0, "serial-number", serial, 203 strlen(serial) + 1); 204 205 if (err < 0) { 206 printf("WARNING: could not set serial-number %s.\n", 207 fdt_strerror(err)); 208 return err; 209 } 210 } 211 212 return 0; 213 } 214 215 int fdt_initrd(void *fdt, ulong initrd_start, ulong initrd_end) 216 { 217 int nodeoffset; 218 int err, j, total; 219 int is_u64; 220 uint64_t addr, size; 221 222 /* just return if the size of initrd is zero */ 223 if (initrd_start == initrd_end) 224 return 0; 225 226 /* find or create "/chosen" node. */ 227 nodeoffset = fdt_find_or_add_subnode(fdt, 0, "chosen"); 228 if (nodeoffset < 0) 229 return nodeoffset; 230 231 total = fdt_num_mem_rsv(fdt); 232 233 /* 234 * Look for an existing entry and update it. If we don't find 235 * the entry, we will j be the next available slot. 236 */ 237 for (j = 0; j < total; j++) { 238 err = fdt_get_mem_rsv(fdt, j, &addr, &size); 239 if (addr == initrd_start) { 240 fdt_del_mem_rsv(fdt, j); 241 break; 242 } 243 } 244 245 err = fdt_add_mem_rsv(fdt, initrd_start, initrd_end - initrd_start); 246 if (err < 0) { 247 printf("fdt_initrd: %s\n", fdt_strerror(err)); 248 return err; 249 } 250 251 is_u64 = (fdt_address_cells(fdt, 0) == 2); 252 253 err = fdt_setprop_uxx(fdt, nodeoffset, "linux,initrd-start", 254 (uint64_t)initrd_start, is_u64); 255 256 if (err < 0) { 257 printf("WARNING: could not set linux,initrd-start %s.\n", 258 fdt_strerror(err)); 259 return err; 260 } 261 262 err = fdt_setprop_uxx(fdt, nodeoffset, "linux,initrd-end", 263 (uint64_t)initrd_end, is_u64); 264 265 if (err < 0) { 266 printf("WARNING: could not set linux,initrd-end %s.\n", 267 fdt_strerror(err)); 268 269 return err; 270 } 271 272 return 0; 273 } 274 275 int fdt_chosen(void *fdt) 276 { 277 int nodeoffset; 278 int err; 279 char *str; /* used to set string properties */ 280 281 err = fdt_check_header(fdt); 282 if (err < 0) { 283 printf("fdt_chosen: %s\n", fdt_strerror(err)); 284 return err; 285 } 286 287 /* find or create "/chosen" node. */ 288 nodeoffset = fdt_find_or_add_subnode(fdt, 0, "chosen"); 289 if (nodeoffset < 0) 290 return nodeoffset; 291 292 str = env_get("bootargs"); 293 if (str) { 294 #ifdef CONFIG_ARCH_ROCKCHIP 295 const char *bootargs; 296 297 bootargs = fdt_getprop(fdt, nodeoffset, "bootargs", NULL); 298 if (bootargs) { 299 /* Append kernel bootargs */ 300 env_update("bootargs", bootargs); 301 /* 302 * Initrd fixup: remove unused "initrd=0x...,0x...", 303 * this for compatible with legacy parameter.txt 304 */ 305 env_delete("bootargs", "initrd="); 306 str = env_get("bootargs"); 307 } 308 #endif 309 err = fdt_setprop(fdt, nodeoffset, "bootargs", str, 310 strlen(str) + 1); 311 if (err < 0) { 312 printf("WARNING: could not set bootargs %s.\n", 313 fdt_strerror(err)); 314 return err; 315 } 316 } 317 318 return fdt_fixup_stdout(fdt, nodeoffset); 319 } 320 321 void do_fixup_by_path(void *fdt, const char *path, const char *prop, 322 const void *val, int len, int create) 323 { 324 #if defined(DEBUG) 325 int i; 326 debug("Updating property '%s/%s' = ", path, prop); 327 for (i = 0; i < len; i++) 328 debug(" %.2x", *(u8*)(val+i)); 329 debug("\n"); 330 #endif 331 int rc = fdt_find_and_setprop(fdt, path, prop, val, len, create); 332 if (rc) 333 printf("Unable to update property %s:%s, err=%s\n", 334 path, prop, fdt_strerror(rc)); 335 } 336 337 void do_fixup_by_path_u32(void *fdt, const char *path, const char *prop, 338 u32 val, int create) 339 { 340 fdt32_t tmp = cpu_to_fdt32(val); 341 do_fixup_by_path(fdt, path, prop, &tmp, sizeof(tmp), create); 342 } 343 344 void do_fixup_by_prop(void *fdt, 345 const char *pname, const void *pval, int plen, 346 const char *prop, const void *val, int len, 347 int create) 348 { 349 int off; 350 #if defined(DEBUG) 351 int i; 352 debug("Updating property '%s' = ", prop); 353 for (i = 0; i < len; i++) 354 debug(" %.2x", *(u8*)(val+i)); 355 debug("\n"); 356 #endif 357 off = fdt_node_offset_by_prop_value(fdt, -1, pname, pval, plen); 358 while (off != -FDT_ERR_NOTFOUND) { 359 if (create || (fdt_get_property(fdt, off, prop, NULL) != NULL)) 360 fdt_setprop(fdt, off, prop, val, len); 361 off = fdt_node_offset_by_prop_value(fdt, off, pname, pval, plen); 362 } 363 } 364 365 void do_fixup_by_prop_u32(void *fdt, 366 const char *pname, const void *pval, int plen, 367 const char *prop, u32 val, int create) 368 { 369 fdt32_t tmp = cpu_to_fdt32(val); 370 do_fixup_by_prop(fdt, pname, pval, plen, prop, &tmp, 4, create); 371 } 372 373 void do_fixup_by_compat(void *fdt, const char *compat, 374 const char *prop, const void *val, int len, int create) 375 { 376 int off = -1; 377 #if defined(DEBUG) 378 int i; 379 debug("Updating property '%s' = ", prop); 380 for (i = 0; i < len; i++) 381 debug(" %.2x", *(u8*)(val+i)); 382 debug("\n"); 383 #endif 384 off = fdt_node_offset_by_compatible(fdt, -1, compat); 385 while (off != -FDT_ERR_NOTFOUND) { 386 if (create || (fdt_get_property(fdt, off, prop, NULL) != NULL)) 387 fdt_setprop(fdt, off, prop, val, len); 388 off = fdt_node_offset_by_compatible(fdt, off, compat); 389 } 390 } 391 392 void do_fixup_by_compat_u32(void *fdt, const char *compat, 393 const char *prop, u32 val, int create) 394 { 395 fdt32_t tmp = cpu_to_fdt32(val); 396 do_fixup_by_compat(fdt, compat, prop, &tmp, 4, create); 397 } 398 399 #ifdef CONFIG_ARCH_FIXUP_FDT_MEMORY 400 /* 401 * fdt_pack_reg - pack address and size array into the "reg"-suitable stream 402 */ 403 static int fdt_pack_reg(const void *fdt, void *buf, u64 *address, u64 *size, 404 int n) 405 { 406 int i; 407 int address_cells = fdt_address_cells(fdt, 0); 408 int size_cells = fdt_size_cells(fdt, 0); 409 char *p = buf; 410 411 for (i = 0; i < n; i++) { 412 if (address_cells == 2) 413 *(fdt64_t *)p = cpu_to_fdt64(address[i]); 414 else 415 *(fdt32_t *)p = cpu_to_fdt32(address[i]); 416 p += 4 * address_cells; 417 418 if (size_cells == 2) 419 *(fdt64_t *)p = cpu_to_fdt64(size[i]); 420 else 421 *(fdt32_t *)p = cpu_to_fdt32(size[i]); 422 p += 4 * size_cells; 423 } 424 425 return p - (char *)buf; 426 } 427 428 int fdt_record_loadable(void *blob, u32 index, const char *name, 429 uintptr_t load_addr, u32 size, uintptr_t entry_point, 430 const char *type, const char *os) 431 { 432 int err, node; 433 434 err = fdt_check_header(blob); 435 if (err < 0) { 436 printf("%s: %s\n", __func__, fdt_strerror(err)); 437 return err; 438 } 439 440 /* find or create "/fit-images" node */ 441 node = fdt_find_or_add_subnode(blob, 0, "fit-images"); 442 if (node < 0) 443 return node; 444 445 /* find or create "/fit-images/<name>" node */ 446 node = fdt_find_or_add_subnode(blob, node, name); 447 if (node < 0) 448 return node; 449 450 /* 451 * We record these as 32bit entities, possibly truncating addresses. 452 * However, spl_fit.c is not 64bit safe either: i.e. we should not 453 * have an issue here. 454 */ 455 fdt_setprop_u32(blob, node, "load-addr", load_addr); 456 if (entry_point != -1) 457 fdt_setprop_u32(blob, node, "entry-point", entry_point); 458 fdt_setprop_u32(blob, node, "size", size); 459 if (type) 460 fdt_setprop_string(blob, node, "type", type); 461 if (os) 462 fdt_setprop_string(blob, node, "os", os); 463 464 return node; 465 } 466 467 #ifdef CONFIG_NR_DRAM_BANKS 468 #define MEMORY_BANKS_MAX CONFIG_NR_DRAM_BANKS 469 #else 470 #define MEMORY_BANKS_MAX 4 471 #endif 472 int fdt_fixup_memory_banks(void *blob, u64 start[], u64 size[], int banks) 473 { 474 int err, nodeoffset; 475 int len; 476 u8 tmp[MEMORY_BANKS_MAX * 16]; /* Up to 64-bit address + 64-bit size */ 477 478 if (banks > MEMORY_BANKS_MAX) { 479 printf("%s: num banks %d exceeds hardcoded limit %d." 480 " Recompile with higher MEMORY_BANKS_MAX?\n", 481 __FUNCTION__, banks, MEMORY_BANKS_MAX); 482 return -1; 483 } 484 485 err = fdt_check_header(blob); 486 if (err < 0) { 487 printf("%s: %s\n", __FUNCTION__, fdt_strerror(err)); 488 return err; 489 } 490 491 /* find or create "/memory" node. */ 492 nodeoffset = fdt_find_or_add_subnode(blob, 0, "memory"); 493 if (nodeoffset < 0) 494 return nodeoffset; 495 496 err = fdt_setprop(blob, nodeoffset, "device_type", "memory", 497 sizeof("memory")); 498 if (err < 0) { 499 printf("WARNING: could not set %s %s.\n", "device_type", 500 fdt_strerror(err)); 501 return err; 502 } 503 504 if (!banks) 505 return 0; 506 507 len = fdt_pack_reg(blob, tmp, start, size, banks); 508 509 err = fdt_setprop(blob, nodeoffset, "reg", tmp, len); 510 if (err < 0) { 511 printf("WARNING: could not set %s %s.\n", 512 "reg", fdt_strerror(err)); 513 return err; 514 } 515 return 0; 516 } 517 #endif 518 519 int fdt_fixup_memory(void *blob, u64 start, u64 size) 520 { 521 return fdt_fixup_memory_banks(blob, &start, &size, 1); 522 } 523 524 void fdt_fixup_ethernet(void *fdt) 525 { 526 int i = 0, j, prop; 527 char *tmp, *end; 528 char mac[16]; 529 const char *path; 530 unsigned char mac_addr[ARP_HLEN]; 531 int offset; 532 #ifdef FDT_SEQ_MACADDR_FROM_ENV 533 int nodeoff; 534 const struct fdt_property *fdt_prop; 535 #endif 536 537 if (fdt_path_offset(fdt, "/aliases") < 0) 538 return; 539 540 /* Cycle through all aliases */ 541 for (prop = 0; ; prop++) { 542 const char *name; 543 544 /* FDT might have been edited, recompute the offset */ 545 offset = fdt_first_property_offset(fdt, 546 fdt_path_offset(fdt, "/aliases")); 547 /* Select property number 'prop' */ 548 for (j = 0; j < prop; j++) 549 offset = fdt_next_property_offset(fdt, offset); 550 551 if (offset < 0) 552 break; 553 554 path = fdt_getprop_by_offset(fdt, offset, &name, NULL); 555 if (!strncmp(name, "ethernet", 8)) { 556 /* Treat plain "ethernet" same as "ethernet0". */ 557 if (!strcmp(name, "ethernet") 558 #ifdef FDT_SEQ_MACADDR_FROM_ENV 559 || !strcmp(name, "ethernet0") 560 #endif 561 ) 562 i = 0; 563 #ifndef FDT_SEQ_MACADDR_FROM_ENV 564 else 565 i = trailing_strtol(name); 566 #endif 567 if (i != -1) { 568 if (i == 0) 569 strcpy(mac, "ethaddr"); 570 else 571 sprintf(mac, "eth%daddr", i); 572 } else { 573 continue; 574 } 575 #ifdef FDT_SEQ_MACADDR_FROM_ENV 576 nodeoff = fdt_path_offset(fdt, path); 577 fdt_prop = fdt_get_property(fdt, nodeoff, "status", 578 NULL); 579 if (fdt_prop && !strcmp(fdt_prop->data, "disabled")) 580 continue; 581 i++; 582 #endif 583 tmp = env_get(mac); 584 if (!tmp) 585 continue; 586 587 for (j = 0; j < 6; j++) { 588 mac_addr[j] = tmp ? 589 simple_strtoul(tmp, &end, 16) : 0; 590 if (tmp) 591 tmp = (*end) ? end + 1 : end; 592 } 593 594 do_fixup_by_path(fdt, path, "mac-address", 595 &mac_addr, 6, 0); 596 do_fixup_by_path(fdt, path, "local-mac-address", 597 &mac_addr, 6, 1); 598 } 599 } 600 } 601 602 /* Resize the fdt to its actual size + a bit of padding */ 603 int fdt_shrink_to_minimum(void *blob, uint extrasize) 604 { 605 int i; 606 uint64_t addr, size; 607 int total, ret; 608 uint actualsize; 609 610 if (!blob) 611 return 0; 612 613 total = fdt_num_mem_rsv(blob); 614 for (i = 0; i < total; i++) { 615 fdt_get_mem_rsv(blob, i, &addr, &size); 616 if (addr == (uintptr_t)blob) { 617 fdt_del_mem_rsv(blob, i); 618 break; 619 } 620 } 621 622 /* 623 * Calculate the actual size of the fdt 624 * plus the size needed for 5 fdt_add_mem_rsv, one 625 * for the fdt itself and 4 for a possible initrd 626 * ((initrd-start + initrd-end) * 2 (name & value)) 627 */ 628 actualsize = fdt_off_dt_strings(blob) + 629 fdt_size_dt_strings(blob) + 5 * sizeof(struct fdt_reserve_entry); 630 631 actualsize += extrasize; 632 /* Make it so the fdt ends on a page boundary */ 633 actualsize = ALIGN(actualsize + ((uintptr_t)blob & 0xfff), 0x1000); 634 actualsize = actualsize - ((uintptr_t)blob & 0xfff); 635 636 /* Change the fdt header to reflect the correct size */ 637 fdt_set_totalsize(blob, actualsize); 638 639 /* Add the new reservation */ 640 ret = fdt_add_mem_rsv(blob, (uintptr_t)blob, actualsize); 641 if (ret < 0) 642 return ret; 643 644 return actualsize; 645 } 646 647 #ifdef CONFIG_PCI 648 #define CONFIG_SYS_PCI_NR_INBOUND_WIN 4 649 650 #define FDT_PCI_PREFETCH (0x40000000) 651 #define FDT_PCI_MEM32 (0x02000000) 652 #define FDT_PCI_IO (0x01000000) 653 #define FDT_PCI_MEM64 (0x03000000) 654 655 int fdt_pci_dma_ranges(void *blob, int phb_off, struct pci_controller *hose) { 656 657 int addrcell, sizecell, len, r; 658 u32 *dma_range; 659 /* sized based on pci addr cells, size-cells, & address-cells */ 660 u32 dma_ranges[(3 + 2 + 2) * CONFIG_SYS_PCI_NR_INBOUND_WIN]; 661 662 addrcell = fdt_getprop_u32_default(blob, "/", "#address-cells", 1); 663 sizecell = fdt_getprop_u32_default(blob, "/", "#size-cells", 1); 664 665 dma_range = &dma_ranges[0]; 666 for (r = 0; r < hose->region_count; r++) { 667 u64 bus_start, phys_start, size; 668 669 /* skip if !PCI_REGION_SYS_MEMORY */ 670 if (!(hose->regions[r].flags & PCI_REGION_SYS_MEMORY)) 671 continue; 672 673 bus_start = (u64)hose->regions[r].bus_start; 674 phys_start = (u64)hose->regions[r].phys_start; 675 size = (u64)hose->regions[r].size; 676 677 dma_range[0] = 0; 678 if (size >= 0x100000000ull) 679 dma_range[0] |= FDT_PCI_MEM64; 680 else 681 dma_range[0] |= FDT_PCI_MEM32; 682 if (hose->regions[r].flags & PCI_REGION_PREFETCH) 683 dma_range[0] |= FDT_PCI_PREFETCH; 684 #ifdef CONFIG_SYS_PCI_64BIT 685 dma_range[1] = bus_start >> 32; 686 #else 687 dma_range[1] = 0; 688 #endif 689 dma_range[2] = bus_start & 0xffffffff; 690 691 if (addrcell == 2) { 692 dma_range[3] = phys_start >> 32; 693 dma_range[4] = phys_start & 0xffffffff; 694 } else { 695 dma_range[3] = phys_start & 0xffffffff; 696 } 697 698 if (sizecell == 2) { 699 dma_range[3 + addrcell + 0] = size >> 32; 700 dma_range[3 + addrcell + 1] = size & 0xffffffff; 701 } else { 702 dma_range[3 + addrcell + 0] = size & 0xffffffff; 703 } 704 705 dma_range += (3 + addrcell + sizecell); 706 } 707 708 len = dma_range - &dma_ranges[0]; 709 if (len) 710 fdt_setprop(blob, phb_off, "dma-ranges", &dma_ranges[0], len*4); 711 712 return 0; 713 } 714 #endif 715 716 int fdt_increase_size(void *fdt, int add_len) 717 { 718 int newlen; 719 720 newlen = fdt_totalsize(fdt) + add_len; 721 722 /* Open in place with a new len */ 723 return fdt_open_into(fdt, fdt, newlen); 724 } 725 726 #ifdef CONFIG_FDT_FIXUP_PARTITIONS 727 #include <jffs2/load_kernel.h> 728 #include <mtd_node.h> 729 730 struct reg_cell { 731 unsigned int r0; 732 unsigned int r1; 733 }; 734 735 int fdt_del_subnodes(const void *blob, int parent_offset) 736 { 737 int off, ndepth; 738 int ret; 739 740 for (ndepth = 0, off = fdt_next_node(blob, parent_offset, &ndepth); 741 (off >= 0) && (ndepth > 0); 742 off = fdt_next_node(blob, off, &ndepth)) { 743 if (ndepth == 1) { 744 debug("delete %s: offset: %x\n", 745 fdt_get_name(blob, off, 0), off); 746 ret = fdt_del_node((void *)blob, off); 747 if (ret < 0) { 748 printf("Can't delete node: %s\n", 749 fdt_strerror(ret)); 750 return ret; 751 } else { 752 ndepth = 0; 753 off = parent_offset; 754 } 755 } 756 } 757 return 0; 758 } 759 760 int fdt_del_partitions(void *blob, int parent_offset) 761 { 762 const void *prop; 763 int ndepth = 0; 764 int off; 765 int ret; 766 767 off = fdt_next_node(blob, parent_offset, &ndepth); 768 if (off > 0 && ndepth == 1) { 769 prop = fdt_getprop(blob, off, "label", NULL); 770 if (prop == NULL) { 771 /* 772 * Could not find label property, nand {}; node? 773 * Check subnode, delete partitions there if any. 774 */ 775 return fdt_del_partitions(blob, off); 776 } else { 777 ret = fdt_del_subnodes(blob, parent_offset); 778 if (ret < 0) { 779 printf("Can't remove subnodes: %s\n", 780 fdt_strerror(ret)); 781 return ret; 782 } 783 } 784 } 785 return 0; 786 } 787 788 int fdt_node_set_part_info(void *blob, int parent_offset, 789 struct mtd_device *dev) 790 { 791 struct list_head *pentry; 792 struct part_info *part; 793 struct reg_cell cell; 794 int off, ndepth = 0; 795 int part_num, ret; 796 char buf[64]; 797 798 ret = fdt_del_partitions(blob, parent_offset); 799 if (ret < 0) 800 return ret; 801 802 /* 803 * Check if it is nand {}; subnode, adjust 804 * the offset in this case 805 */ 806 off = fdt_next_node(blob, parent_offset, &ndepth); 807 if (off > 0 && ndepth == 1) 808 parent_offset = off; 809 810 part_num = 0; 811 list_for_each_prev(pentry, &dev->parts) { 812 int newoff; 813 814 part = list_entry(pentry, struct part_info, link); 815 816 debug("%2d: %-20s0x%08llx\t0x%08llx\t%d\n", 817 part_num, part->name, part->size, 818 part->offset, part->mask_flags); 819 820 sprintf(buf, "partition@%llx", part->offset); 821 add_sub: 822 ret = fdt_add_subnode(blob, parent_offset, buf); 823 if (ret == -FDT_ERR_NOSPACE) { 824 ret = fdt_increase_size(blob, 512); 825 if (!ret) 826 goto add_sub; 827 else 828 goto err_size; 829 } else if (ret < 0) { 830 printf("Can't add partition node: %s\n", 831 fdt_strerror(ret)); 832 return ret; 833 } 834 newoff = ret; 835 836 /* Check MTD_WRITEABLE_CMD flag */ 837 if (part->mask_flags & 1) { 838 add_ro: 839 ret = fdt_setprop(blob, newoff, "read_only", NULL, 0); 840 if (ret == -FDT_ERR_NOSPACE) { 841 ret = fdt_increase_size(blob, 512); 842 if (!ret) 843 goto add_ro; 844 else 845 goto err_size; 846 } else if (ret < 0) 847 goto err_prop; 848 } 849 850 cell.r0 = cpu_to_fdt32(part->offset); 851 cell.r1 = cpu_to_fdt32(part->size); 852 add_reg: 853 ret = fdt_setprop(blob, newoff, "reg", &cell, sizeof(cell)); 854 if (ret == -FDT_ERR_NOSPACE) { 855 ret = fdt_increase_size(blob, 512); 856 if (!ret) 857 goto add_reg; 858 else 859 goto err_size; 860 } else if (ret < 0) 861 goto err_prop; 862 863 add_label: 864 ret = fdt_setprop_string(blob, newoff, "label", part->name); 865 if (ret == -FDT_ERR_NOSPACE) { 866 ret = fdt_increase_size(blob, 512); 867 if (!ret) 868 goto add_label; 869 else 870 goto err_size; 871 } else if (ret < 0) 872 goto err_prop; 873 874 part_num++; 875 } 876 return 0; 877 err_size: 878 printf("Can't increase blob size: %s\n", fdt_strerror(ret)); 879 return ret; 880 err_prop: 881 printf("Can't add property: %s\n", fdt_strerror(ret)); 882 return ret; 883 } 884 885 /* 886 * Update partitions in nor/nand nodes using info from 887 * mtdparts environment variable. The nodes to update are 888 * specified by node_info structure which contains mtd device 889 * type and compatible string: E. g. the board code in 890 * ft_board_setup() could use: 891 * 892 * struct node_info nodes[] = { 893 * { "fsl,mpc5121-nfc", MTD_DEV_TYPE_NAND, }, 894 * { "cfi-flash", MTD_DEV_TYPE_NOR, }, 895 * }; 896 * 897 * fdt_fixup_mtdparts(blob, nodes, ARRAY_SIZE(nodes)); 898 */ 899 void fdt_fixup_mtdparts(void *blob, void *node_info, int node_info_size) 900 { 901 struct node_info *ni = node_info; 902 struct mtd_device *dev; 903 int i, idx; 904 int noff; 905 906 if (mtdparts_init() != 0) 907 return; 908 909 for (i = 0; i < node_info_size; i++) { 910 idx = 0; 911 noff = fdt_node_offset_by_compatible(blob, -1, ni[i].compat); 912 while (noff != -FDT_ERR_NOTFOUND) { 913 debug("%s: %s, mtd dev type %d\n", 914 fdt_get_name(blob, noff, 0), 915 ni[i].compat, ni[i].type); 916 dev = device_find(ni[i].type, idx++); 917 if (dev) { 918 if (fdt_node_set_part_info(blob, noff, dev)) 919 return; /* return on error */ 920 } 921 922 /* Jump to next flash node */ 923 noff = fdt_node_offset_by_compatible(blob, noff, 924 ni[i].compat); 925 } 926 } 927 } 928 #endif 929 930 void fdt_del_node_and_alias(void *blob, const char *alias) 931 { 932 int off = fdt_path_offset(blob, alias); 933 934 if (off < 0) 935 return; 936 937 fdt_del_node(blob, off); 938 939 off = fdt_path_offset(blob, "/aliases"); 940 fdt_delprop(blob, off, alias); 941 } 942 943 /* Max address size we deal with */ 944 #define OF_MAX_ADDR_CELLS 4 945 #define OF_BAD_ADDR FDT_ADDR_T_NONE 946 #define OF_CHECK_COUNTS(na, ns) ((na) > 0 && (na) <= OF_MAX_ADDR_CELLS && \ 947 (ns) > 0) 948 949 /* Debug utility */ 950 #ifdef DEBUG 951 static void of_dump_addr(const char *s, const fdt32_t *addr, int na) 952 { 953 printf("%s", s); 954 while(na--) 955 printf(" %08x", *(addr++)); 956 printf("\n"); 957 } 958 #else 959 static void of_dump_addr(const char *s, const fdt32_t *addr, int na) { } 960 #endif 961 962 /** 963 * struct of_bus - Callbacks for bus specific translators 964 * @name: A string used to identify this bus in debug output. 965 * @addresses: The name of the DT property from which addresses are 966 * to be read, typically "reg". 967 * @match: Return non-zero if the node whose parent is at 968 * parentoffset in the FDT blob corresponds to a bus 969 * of this type, otherwise return zero. If NULL a match 970 * is assumed. 971 * @count_cells:Count how many cells (be32 values) a node whose parent 972 * is at parentoffset in the FDT blob will require to 973 * represent its address (written to *addrc) & size 974 * (written to *sizec). 975 * @map: Map the address addr from the address space of this 976 * bus to that of its parent, making use of the ranges 977 * read from DT to an array at range. na and ns are the 978 * number of cells (be32 values) used to hold and address 979 * or size, respectively, for this bus. pna is the number 980 * of cells used to hold an address for the parent bus. 981 * Returns the address in the address space of the parent 982 * bus. 983 * @translate: Update the value of the address cells at addr within an 984 * FDT by adding offset to it. na specifies the number of 985 * cells used to hold the address being translated. Returns 986 * zero on success, non-zero on error. 987 * 988 * Each bus type will include a struct of_bus in the of_busses array, 989 * providing implementations of some or all of the functions used to 990 * match the bus & handle address translation for its children. 991 */ 992 struct of_bus { 993 const char *name; 994 const char *addresses; 995 int (*match)(const void *blob, int parentoffset); 996 void (*count_cells)(const void *blob, int parentoffset, 997 int *addrc, int *sizec); 998 u64 (*map)(fdt32_t *addr, const fdt32_t *range, 999 int na, int ns, int pna); 1000 int (*translate)(fdt32_t *addr, u64 offset, int na); 1001 }; 1002 1003 /* Default translator (generic bus) */ 1004 void fdt_support_default_count_cells(const void *blob, int parentoffset, 1005 int *addrc, int *sizec) 1006 { 1007 const fdt32_t *prop; 1008 1009 if (addrc) 1010 *addrc = fdt_address_cells(blob, parentoffset); 1011 1012 if (sizec) { 1013 prop = fdt_getprop(blob, parentoffset, "#size-cells", NULL); 1014 if (prop) 1015 *sizec = be32_to_cpup(prop); 1016 else 1017 *sizec = 1; 1018 } 1019 } 1020 1021 static u64 of_bus_default_map(fdt32_t *addr, const fdt32_t *range, 1022 int na, int ns, int pna) 1023 { 1024 u64 cp, s, da; 1025 1026 cp = fdt_read_number(range, na); 1027 s = fdt_read_number(range + na + pna, ns); 1028 da = fdt_read_number(addr, na); 1029 1030 debug("OF: default map, cp=%" PRIu64 ", s=%" PRIu64 1031 ", da=%" PRIu64 "\n", cp, s, da); 1032 1033 if (da < cp || da >= (cp + s)) 1034 return OF_BAD_ADDR; 1035 return da - cp; 1036 } 1037 1038 static int of_bus_default_translate(fdt32_t *addr, u64 offset, int na) 1039 { 1040 u64 a = fdt_read_number(addr, na); 1041 memset(addr, 0, na * 4); 1042 a += offset; 1043 if (na > 1) 1044 addr[na - 2] = cpu_to_fdt32(a >> 32); 1045 addr[na - 1] = cpu_to_fdt32(a & 0xffffffffu); 1046 1047 return 0; 1048 } 1049 1050 #ifdef CONFIG_OF_ISA_BUS 1051 1052 /* ISA bus translator */ 1053 static int of_bus_isa_match(const void *blob, int parentoffset) 1054 { 1055 const char *name; 1056 1057 name = fdt_get_name(blob, parentoffset, NULL); 1058 if (!name) 1059 return 0; 1060 1061 return !strcmp(name, "isa"); 1062 } 1063 1064 static void of_bus_isa_count_cells(const void *blob, int parentoffset, 1065 int *addrc, int *sizec) 1066 { 1067 if (addrc) 1068 *addrc = 2; 1069 if (sizec) 1070 *sizec = 1; 1071 } 1072 1073 static u64 of_bus_isa_map(fdt32_t *addr, const fdt32_t *range, 1074 int na, int ns, int pna) 1075 { 1076 u64 cp, s, da; 1077 1078 /* Check address type match */ 1079 if ((addr[0] ^ range[0]) & cpu_to_be32(1)) 1080 return OF_BAD_ADDR; 1081 1082 cp = fdt_read_number(range + 1, na - 1); 1083 s = fdt_read_number(range + na + pna, ns); 1084 da = fdt_read_number(addr + 1, na - 1); 1085 1086 debug("OF: ISA map, cp=%" PRIu64 ", s=%" PRIu64 1087 ", da=%" PRIu64 "\n", cp, s, da); 1088 1089 if (da < cp || da >= (cp + s)) 1090 return OF_BAD_ADDR; 1091 return da - cp; 1092 } 1093 1094 static int of_bus_isa_translate(fdt32_t *addr, u64 offset, int na) 1095 { 1096 return of_bus_default_translate(addr + 1, offset, na - 1); 1097 } 1098 1099 #endif /* CONFIG_OF_ISA_BUS */ 1100 1101 /* Array of bus specific translators */ 1102 static struct of_bus of_busses[] = { 1103 #ifdef CONFIG_OF_ISA_BUS 1104 /* ISA */ 1105 { 1106 .name = "isa", 1107 .addresses = "reg", 1108 .match = of_bus_isa_match, 1109 .count_cells = of_bus_isa_count_cells, 1110 .map = of_bus_isa_map, 1111 .translate = of_bus_isa_translate, 1112 }, 1113 #endif /* CONFIG_OF_ISA_BUS */ 1114 /* Default */ 1115 { 1116 .name = "default", 1117 .addresses = "reg", 1118 .count_cells = fdt_support_default_count_cells, 1119 .map = of_bus_default_map, 1120 .translate = of_bus_default_translate, 1121 }, 1122 }; 1123 1124 static struct of_bus *of_match_bus(const void *blob, int parentoffset) 1125 { 1126 struct of_bus *bus; 1127 1128 if (ARRAY_SIZE(of_busses) == 1) 1129 return of_busses; 1130 1131 for (bus = of_busses; bus; bus++) { 1132 if (!bus->match || bus->match(blob, parentoffset)) 1133 return bus; 1134 } 1135 1136 /* 1137 * We should always have matched the default bus at least, since 1138 * it has a NULL match field. If we didn't then it somehow isn't 1139 * in the of_busses array or something equally catastrophic has 1140 * gone wrong. 1141 */ 1142 assert(0); 1143 return NULL; 1144 } 1145 1146 static int of_translate_one(const void *blob, int parent, struct of_bus *bus, 1147 struct of_bus *pbus, fdt32_t *addr, 1148 int na, int ns, int pna, const char *rprop) 1149 { 1150 const fdt32_t *ranges; 1151 int rlen; 1152 int rone; 1153 u64 offset = OF_BAD_ADDR; 1154 1155 /* Normally, an absence of a "ranges" property means we are 1156 * crossing a non-translatable boundary, and thus the addresses 1157 * below the current not cannot be converted to CPU physical ones. 1158 * Unfortunately, while this is very clear in the spec, it's not 1159 * what Apple understood, and they do have things like /uni-n or 1160 * /ht nodes with no "ranges" property and a lot of perfectly 1161 * useable mapped devices below them. Thus we treat the absence of 1162 * "ranges" as equivalent to an empty "ranges" property which means 1163 * a 1:1 translation at that level. It's up to the caller not to try 1164 * to translate addresses that aren't supposed to be translated in 1165 * the first place. --BenH. 1166 */ 1167 ranges = fdt_getprop(blob, parent, rprop, &rlen); 1168 if (ranges == NULL || rlen == 0) { 1169 offset = fdt_read_number(addr, na); 1170 memset(addr, 0, pna * 4); 1171 debug("OF: no ranges, 1:1 translation\n"); 1172 goto finish; 1173 } 1174 1175 debug("OF: walking ranges...\n"); 1176 1177 /* Now walk through the ranges */ 1178 rlen /= 4; 1179 rone = na + pna + ns; 1180 for (; rlen >= rone; rlen -= rone, ranges += rone) { 1181 offset = bus->map(addr, ranges, na, ns, pna); 1182 if (offset != OF_BAD_ADDR) 1183 break; 1184 } 1185 if (offset == OF_BAD_ADDR) { 1186 debug("OF: not found !\n"); 1187 return 1; 1188 } 1189 memcpy(addr, ranges + na, 4 * pna); 1190 1191 finish: 1192 of_dump_addr("OF: parent translation for:", addr, pna); 1193 debug("OF: with offset: %" PRIu64 "\n", offset); 1194 1195 /* Translate it into parent bus space */ 1196 return pbus->translate(addr, offset, pna); 1197 } 1198 1199 /* 1200 * Translate an address from the device-tree into a CPU physical address, 1201 * this walks up the tree and applies the various bus mappings on the 1202 * way. 1203 * 1204 * Note: We consider that crossing any level with #size-cells == 0 to mean 1205 * that translation is impossible (that is we are not dealing with a value 1206 * that can be mapped to a cpu physical address). This is not really specified 1207 * that way, but this is traditionally the way IBM at least do things 1208 */ 1209 static u64 __of_translate_address(const void *blob, int node_offset, 1210 const fdt32_t *in_addr, const char *rprop) 1211 { 1212 int parent; 1213 struct of_bus *bus, *pbus; 1214 fdt32_t addr[OF_MAX_ADDR_CELLS]; 1215 int na, ns, pna, pns; 1216 u64 result = OF_BAD_ADDR; 1217 1218 debug("OF: ** translation for device %s **\n", 1219 fdt_get_name(blob, node_offset, NULL)); 1220 1221 /* Get parent & match bus type */ 1222 parent = fdt_parent_offset(blob, node_offset); 1223 if (parent < 0) 1224 goto bail; 1225 bus = of_match_bus(blob, parent); 1226 1227 /* Cound address cells & copy address locally */ 1228 bus->count_cells(blob, parent, &na, &ns); 1229 if (!OF_CHECK_COUNTS(na, ns)) { 1230 printf("%s: Bad cell count for %s\n", __FUNCTION__, 1231 fdt_get_name(blob, node_offset, NULL)); 1232 goto bail; 1233 } 1234 memcpy(addr, in_addr, na * 4); 1235 1236 debug("OF: bus is %s (na=%d, ns=%d) on %s\n", 1237 bus->name, na, ns, fdt_get_name(blob, parent, NULL)); 1238 of_dump_addr("OF: translating address:", addr, na); 1239 1240 /* Translate */ 1241 for (;;) { 1242 /* Switch to parent bus */ 1243 node_offset = parent; 1244 parent = fdt_parent_offset(blob, node_offset); 1245 1246 /* If root, we have finished */ 1247 if (parent < 0) { 1248 debug("OF: reached root node\n"); 1249 result = fdt_read_number(addr, na); 1250 break; 1251 } 1252 1253 /* Get new parent bus and counts */ 1254 pbus = of_match_bus(blob, parent); 1255 pbus->count_cells(blob, parent, &pna, &pns); 1256 if (!OF_CHECK_COUNTS(pna, pns)) { 1257 printf("%s: Bad cell count for %s\n", __FUNCTION__, 1258 fdt_get_name(blob, node_offset, NULL)); 1259 break; 1260 } 1261 1262 debug("OF: parent bus is %s (na=%d, ns=%d) on %s\n", 1263 pbus->name, pna, pns, fdt_get_name(blob, parent, NULL)); 1264 1265 /* Apply bus translation */ 1266 if (of_translate_one(blob, node_offset, bus, pbus, 1267 addr, na, ns, pna, rprop)) 1268 break; 1269 1270 /* Complete the move up one level */ 1271 na = pna; 1272 ns = pns; 1273 bus = pbus; 1274 1275 of_dump_addr("OF: one level translation:", addr, na); 1276 } 1277 bail: 1278 1279 return result; 1280 } 1281 1282 u64 fdt_translate_address(const void *blob, int node_offset, 1283 const fdt32_t *in_addr) 1284 { 1285 return __of_translate_address(blob, node_offset, in_addr, "ranges"); 1286 } 1287 1288 /** 1289 * fdt_node_offset_by_compat_reg: Find a node that matches compatiable and 1290 * who's reg property matches a physical cpu address 1291 * 1292 * @blob: ptr to device tree 1293 * @compat: compatiable string to match 1294 * @compat_off: property name 1295 * 1296 */ 1297 int fdt_node_offset_by_compat_reg(void *blob, const char *compat, 1298 phys_addr_t compat_off) 1299 { 1300 int len, off = fdt_node_offset_by_compatible(blob, -1, compat); 1301 while (off != -FDT_ERR_NOTFOUND) { 1302 const fdt32_t *reg = fdt_getprop(blob, off, "reg", &len); 1303 if (reg) { 1304 if (compat_off == fdt_translate_address(blob, off, reg)) 1305 return off; 1306 } 1307 off = fdt_node_offset_by_compatible(blob, off, compat); 1308 } 1309 1310 return -FDT_ERR_NOTFOUND; 1311 } 1312 1313 /** 1314 * fdt_alloc_phandle: Return next free phandle value 1315 * 1316 * @blob: ptr to device tree 1317 */ 1318 int fdt_alloc_phandle(void *blob) 1319 { 1320 int offset; 1321 uint32_t phandle = 0; 1322 1323 for (offset = fdt_next_node(blob, -1, NULL); offset >= 0; 1324 offset = fdt_next_node(blob, offset, NULL)) { 1325 phandle = max(phandle, fdt_get_phandle(blob, offset)); 1326 } 1327 1328 return phandle + 1; 1329 } 1330 1331 /* 1332 * fdt_set_phandle: Create a phandle property for the given node 1333 * 1334 * @fdt: ptr to device tree 1335 * @nodeoffset: node to update 1336 * @phandle: phandle value to set (must be unique) 1337 */ 1338 int fdt_set_phandle(void *fdt, int nodeoffset, uint32_t phandle) 1339 { 1340 int ret; 1341 1342 #ifdef DEBUG 1343 int off = fdt_node_offset_by_phandle(fdt, phandle); 1344 1345 if ((off >= 0) && (off != nodeoffset)) { 1346 char buf[64]; 1347 1348 fdt_get_path(fdt, nodeoffset, buf, sizeof(buf)); 1349 printf("Trying to update node %s with phandle %u ", 1350 buf, phandle); 1351 1352 fdt_get_path(fdt, off, buf, sizeof(buf)); 1353 printf("that already exists in node %s.\n", buf); 1354 return -FDT_ERR_BADPHANDLE; 1355 } 1356 #endif 1357 1358 ret = fdt_setprop_cell(fdt, nodeoffset, "phandle", phandle); 1359 if (ret < 0) 1360 return ret; 1361 1362 /* 1363 * For now, also set the deprecated "linux,phandle" property, so that we 1364 * don't break older kernels. 1365 */ 1366 ret = fdt_setprop_cell(fdt, nodeoffset, "linux,phandle", phandle); 1367 1368 return ret; 1369 } 1370 1371 /* 1372 * fdt_create_phandle: Create a phandle property for the given node 1373 * 1374 * @fdt: ptr to device tree 1375 * @nodeoffset: node to update 1376 */ 1377 unsigned int fdt_create_phandle(void *fdt, int nodeoffset) 1378 { 1379 /* see if there is a phandle already */ 1380 int phandle = fdt_get_phandle(fdt, nodeoffset); 1381 1382 /* if we got 0, means no phandle so create one */ 1383 if (phandle == 0) { 1384 int ret; 1385 1386 phandle = fdt_alloc_phandle(fdt); 1387 ret = fdt_set_phandle(fdt, nodeoffset, phandle); 1388 if (ret < 0) { 1389 printf("Can't set phandle %u: %s\n", phandle, 1390 fdt_strerror(ret)); 1391 return 0; 1392 } 1393 } 1394 1395 return phandle; 1396 } 1397 1398 /* 1399 * fdt_set_node_status: Set status for the given node 1400 * 1401 * @fdt: ptr to device tree 1402 * @nodeoffset: node to update 1403 * @status: FDT_STATUS_OKAY, FDT_STATUS_DISABLED, 1404 * FDT_STATUS_FAIL, FDT_STATUS_FAIL_ERROR_CODE 1405 * @error_code: optional, only used if status is FDT_STATUS_FAIL_ERROR_CODE 1406 */ 1407 int fdt_set_node_status(void *fdt, int nodeoffset, 1408 enum fdt_status status, unsigned int error_code) 1409 { 1410 char buf[16]; 1411 int ret = 0; 1412 1413 if (nodeoffset < 0) 1414 return nodeoffset; 1415 1416 switch (status) { 1417 case FDT_STATUS_OKAY: 1418 ret = fdt_setprop_string(fdt, nodeoffset, "status", "okay"); 1419 break; 1420 case FDT_STATUS_DISABLED: 1421 ret = fdt_setprop_string(fdt, nodeoffset, "status", "disabled"); 1422 break; 1423 case FDT_STATUS_FAIL: 1424 ret = fdt_setprop_string(fdt, nodeoffset, "status", "fail"); 1425 break; 1426 case FDT_STATUS_FAIL_ERROR_CODE: 1427 sprintf(buf, "fail-%d", error_code); 1428 ret = fdt_setprop_string(fdt, nodeoffset, "status", buf); 1429 break; 1430 default: 1431 printf("Invalid fdt status: %x\n", status); 1432 ret = -1; 1433 break; 1434 } 1435 1436 return ret; 1437 } 1438 1439 /* 1440 * fdt_set_status_by_alias: Set status for the given node given an alias 1441 * 1442 * @fdt: ptr to device tree 1443 * @alias: alias of node to update 1444 * @status: FDT_STATUS_OKAY, FDT_STATUS_DISABLED, 1445 * FDT_STATUS_FAIL, FDT_STATUS_FAIL_ERROR_CODE 1446 * @error_code: optional, only used if status is FDT_STATUS_FAIL_ERROR_CODE 1447 */ 1448 int fdt_set_status_by_alias(void *fdt, const char* alias, 1449 enum fdt_status status, unsigned int error_code) 1450 { 1451 int offset = fdt_path_offset(fdt, alias); 1452 1453 return fdt_set_node_status(fdt, offset, status, error_code); 1454 } 1455 1456 #if defined(CONFIG_VIDEO) || defined(CONFIG_LCD) 1457 int fdt_add_edid(void *blob, const char *compat, unsigned char *edid_buf) 1458 { 1459 int noff; 1460 int ret; 1461 1462 noff = fdt_node_offset_by_compatible(blob, -1, compat); 1463 if (noff != -FDT_ERR_NOTFOUND) { 1464 debug("%s: %s\n", fdt_get_name(blob, noff, 0), compat); 1465 add_edid: 1466 ret = fdt_setprop(blob, noff, "edid", edid_buf, 128); 1467 if (ret == -FDT_ERR_NOSPACE) { 1468 ret = fdt_increase_size(blob, 512); 1469 if (!ret) 1470 goto add_edid; 1471 else 1472 goto err_size; 1473 } else if (ret < 0) { 1474 printf("Can't add property: %s\n", fdt_strerror(ret)); 1475 return ret; 1476 } 1477 } 1478 return 0; 1479 err_size: 1480 printf("Can't increase blob size: %s\n", fdt_strerror(ret)); 1481 return ret; 1482 } 1483 #endif 1484 1485 /* 1486 * Verify the physical address of device tree node for a given alias 1487 * 1488 * This function locates the device tree node of a given alias, and then 1489 * verifies that the physical address of that device matches the given 1490 * parameter. It displays a message if there is a mismatch. 1491 * 1492 * Returns 1 on success, 0 on failure 1493 */ 1494 int fdt_verify_alias_address(void *fdt, int anode, const char *alias, u64 addr) 1495 { 1496 const char *path; 1497 const fdt32_t *reg; 1498 int node, len; 1499 u64 dt_addr; 1500 1501 path = fdt_getprop(fdt, anode, alias, NULL); 1502 if (!path) { 1503 /* If there's no such alias, then it's not a failure */ 1504 return 1; 1505 } 1506 1507 node = fdt_path_offset(fdt, path); 1508 if (node < 0) { 1509 printf("Warning: device tree alias '%s' points to invalid " 1510 "node %s.\n", alias, path); 1511 return 0; 1512 } 1513 1514 reg = fdt_getprop(fdt, node, "reg", &len); 1515 if (!reg) { 1516 printf("Warning: device tree node '%s' has no address.\n", 1517 path); 1518 return 0; 1519 } 1520 1521 dt_addr = fdt_translate_address(fdt, node, reg); 1522 if (addr != dt_addr) { 1523 printf("Warning: U-Boot configured device %s at address %" 1524 PRIx64 ",\n but the device tree has it address %" 1525 PRIx64 ".\n", alias, addr, dt_addr); 1526 return 0; 1527 } 1528 1529 return 1; 1530 } 1531 1532 /* 1533 * Returns the base address of an SOC or PCI node 1534 */ 1535 u64 fdt_get_base_address(const void *fdt, int node) 1536 { 1537 int size; 1538 const fdt32_t *prop; 1539 1540 prop = fdt_getprop(fdt, node, "reg", &size); 1541 1542 return prop ? fdt_translate_address(fdt, node, prop) : 0; 1543 } 1544 1545 /* 1546 * Read a property of size <prop_len>. Currently only supports 1 or 2 cells. 1547 */ 1548 static int fdt_read_prop(const fdt32_t *prop, int prop_len, int cell_off, 1549 uint64_t *val, int cells) 1550 { 1551 const fdt32_t *prop32 = &prop[cell_off]; 1552 const fdt64_t *prop64 = (const fdt64_t *)&prop[cell_off]; 1553 1554 if ((cell_off + cells) > prop_len) 1555 return -FDT_ERR_NOSPACE; 1556 1557 switch (cells) { 1558 case 1: 1559 *val = fdt32_to_cpu(*prop32); 1560 break; 1561 case 2: 1562 *val = fdt64_to_cpu(*prop64); 1563 break; 1564 default: 1565 return -FDT_ERR_NOSPACE; 1566 } 1567 1568 return 0; 1569 } 1570 1571 /** 1572 * fdt_read_range - Read a node's n'th range property 1573 * 1574 * @fdt: ptr to device tree 1575 * @node: offset of node 1576 * @n: range index 1577 * @child_addr: pointer to storage for the "child address" field 1578 * @addr: pointer to storage for the CPU view translated physical start 1579 * @len: pointer to storage for the range length 1580 * 1581 * Convenience function that reads and interprets a specific range out of 1582 * a number of the "ranges" property array. 1583 */ 1584 int fdt_read_range(void *fdt, int node, int n, uint64_t *child_addr, 1585 uint64_t *addr, uint64_t *len) 1586 { 1587 int pnode = fdt_parent_offset(fdt, node); 1588 const fdt32_t *ranges; 1589 int pacells; 1590 int acells; 1591 int scells; 1592 int ranges_len; 1593 int cell = 0; 1594 int r = 0; 1595 1596 /* 1597 * The "ranges" property is an array of 1598 * { <child address> <parent address> <size in child address space> } 1599 * 1600 * All 3 elements can span a diffent number of cells. Fetch their size. 1601 */ 1602 pacells = fdt_getprop_u32_default_node(fdt, pnode, 0, "#address-cells", 1); 1603 acells = fdt_getprop_u32_default_node(fdt, node, 0, "#address-cells", 1); 1604 scells = fdt_getprop_u32_default_node(fdt, node, 0, "#size-cells", 1); 1605 1606 /* Now try to get the ranges property */ 1607 ranges = fdt_getprop(fdt, node, "ranges", &ranges_len); 1608 if (!ranges) 1609 return -FDT_ERR_NOTFOUND; 1610 ranges_len /= sizeof(uint32_t); 1611 1612 /* Jump to the n'th entry */ 1613 cell = n * (pacells + acells + scells); 1614 1615 /* Read <child address> */ 1616 if (child_addr) { 1617 r = fdt_read_prop(ranges, ranges_len, cell, child_addr, 1618 acells); 1619 if (r) 1620 return r; 1621 } 1622 cell += acells; 1623 1624 /* Read <parent address> */ 1625 if (addr) 1626 *addr = fdt_translate_address(fdt, node, ranges + cell); 1627 cell += pacells; 1628 1629 /* Read <size in child address space> */ 1630 if (len) { 1631 r = fdt_read_prop(ranges, ranges_len, cell, len, scells); 1632 if (r) 1633 return r; 1634 } 1635 1636 return 0; 1637 } 1638 1639 /** 1640 * fdt_setup_simplefb_node - Fill and enable a simplefb node 1641 * 1642 * @fdt: ptr to device tree 1643 * @node: offset of the simplefb node 1644 * @base_address: framebuffer base address 1645 * @width: width in pixels 1646 * @height: height in pixels 1647 * @stride: bytes per line 1648 * @format: pixel format string 1649 * 1650 * Convenience function to fill and enable a simplefb node. 1651 */ 1652 int fdt_setup_simplefb_node(void *fdt, int node, u64 base_address, u32 width, 1653 u32 height, u32 stride, const char *format) 1654 { 1655 char name[32]; 1656 fdt32_t cells[4]; 1657 int i, addrc, sizec, ret; 1658 1659 fdt_support_default_count_cells(fdt, fdt_parent_offset(fdt, node), 1660 &addrc, &sizec); 1661 i = 0; 1662 if (addrc == 2) 1663 cells[i++] = cpu_to_fdt32(base_address >> 32); 1664 cells[i++] = cpu_to_fdt32(base_address); 1665 if (sizec == 2) 1666 cells[i++] = 0; 1667 cells[i++] = cpu_to_fdt32(height * stride); 1668 1669 ret = fdt_setprop(fdt, node, "reg", cells, sizeof(cells[0]) * i); 1670 if (ret < 0) 1671 return ret; 1672 1673 snprintf(name, sizeof(name), "framebuffer@%" PRIx64, base_address); 1674 ret = fdt_set_name(fdt, node, name); 1675 if (ret < 0) 1676 return ret; 1677 1678 ret = fdt_setprop_u32(fdt, node, "width", width); 1679 if (ret < 0) 1680 return ret; 1681 1682 ret = fdt_setprop_u32(fdt, node, "height", height); 1683 if (ret < 0) 1684 return ret; 1685 1686 ret = fdt_setprop_u32(fdt, node, "stride", stride); 1687 if (ret < 0) 1688 return ret; 1689 1690 ret = fdt_setprop_string(fdt, node, "format", format); 1691 if (ret < 0) 1692 return ret; 1693 1694 ret = fdt_setprop_string(fdt, node, "status", "okay"); 1695 if (ret < 0) 1696 return ret; 1697 1698 return 0; 1699 } 1700 1701 /* 1702 * Update native-mode in display-timings from display environment variable. 1703 * The node to update are specified by path. 1704 */ 1705 int fdt_fixup_display(void *blob, const char *path, const char *display) 1706 { 1707 int off, toff; 1708 1709 if (!display || !path) 1710 return -FDT_ERR_NOTFOUND; 1711 1712 toff = fdt_path_offset(blob, path); 1713 if (toff >= 0) 1714 toff = fdt_subnode_offset(blob, toff, "display-timings"); 1715 if (toff < 0) 1716 return toff; 1717 1718 for (off = fdt_first_subnode(blob, toff); 1719 off >= 0; 1720 off = fdt_next_subnode(blob, off)) { 1721 uint32_t h = fdt_get_phandle(blob, off); 1722 debug("%s:0x%x\n", fdt_get_name(blob, off, NULL), 1723 fdt32_to_cpu(h)); 1724 if (strcasecmp(fdt_get_name(blob, off, NULL), display) == 0) 1725 return fdt_setprop_u32(blob, toff, "native-mode", h); 1726 } 1727 return toff; 1728 } 1729 1730 #ifdef CONFIG_OF_LIBFDT_OVERLAY 1731 /** 1732 * fdt_overlay_apply_verbose - Apply an overlay with verbose error reporting 1733 * 1734 * @fdt: ptr to device tree 1735 * @fdto: ptr to device tree overlay 1736 * 1737 * Convenience function to apply an overlay and display helpful messages 1738 * in the case of an error 1739 */ 1740 int fdt_overlay_apply_verbose(void *fdt, void *fdto) 1741 { 1742 int err; 1743 bool has_symbols; 1744 1745 err = fdt_path_offset(fdt, "/__symbols__"); 1746 has_symbols = err >= 0; 1747 1748 err = fdt_overlay_apply(fdt, fdto); 1749 if (err < 0) { 1750 printf("failed on fdt_overlay_apply(): %s\n", 1751 fdt_strerror(err)); 1752 if (!has_symbols) { 1753 printf("base fdt does did not have a /__symbols__ node\n"); 1754 printf("make sure you've compiled with -@\n"); 1755 } 1756 } 1757 return err; 1758 } 1759 #endif 1760