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 debug("bootargs = %s\n", env_get("bootargs")); 319 320 return fdt_fixup_stdout(fdt, nodeoffset); 321 } 322 323 void do_fixup_by_path(void *fdt, const char *path, const char *prop, 324 const void *val, int len, int create) 325 { 326 #if defined(DEBUG) 327 int i; 328 debug("Updating property '%s/%s' = ", path, prop); 329 for (i = 0; i < len; i++) 330 debug(" %.2x", *(u8*)(val+i)); 331 debug("\n"); 332 #endif 333 int rc = fdt_find_and_setprop(fdt, path, prop, val, len, create); 334 if (rc) 335 printf("Unable to update property %s:%s, err=%s\n", 336 path, prop, fdt_strerror(rc)); 337 } 338 339 void do_fixup_by_path_u32(void *fdt, const char *path, const char *prop, 340 u32 val, int create) 341 { 342 fdt32_t tmp = cpu_to_fdt32(val); 343 do_fixup_by_path(fdt, path, prop, &tmp, sizeof(tmp), create); 344 } 345 346 void do_fixup_by_prop(void *fdt, 347 const char *pname, const void *pval, int plen, 348 const char *prop, const void *val, int len, 349 int create) 350 { 351 int off; 352 #if defined(DEBUG) 353 int i; 354 debug("Updating property '%s' = ", prop); 355 for (i = 0; i < len; i++) 356 debug(" %.2x", *(u8*)(val+i)); 357 debug("\n"); 358 #endif 359 off = fdt_node_offset_by_prop_value(fdt, -1, pname, pval, plen); 360 while (off != -FDT_ERR_NOTFOUND) { 361 if (create || (fdt_get_property(fdt, off, prop, NULL) != NULL)) 362 fdt_setprop(fdt, off, prop, val, len); 363 off = fdt_node_offset_by_prop_value(fdt, off, pname, pval, plen); 364 } 365 } 366 367 void do_fixup_by_prop_u32(void *fdt, 368 const char *pname, const void *pval, int plen, 369 const char *prop, u32 val, int create) 370 { 371 fdt32_t tmp = cpu_to_fdt32(val); 372 do_fixup_by_prop(fdt, pname, pval, plen, prop, &tmp, 4, create); 373 } 374 375 void do_fixup_by_compat(void *fdt, const char *compat, 376 const char *prop, const void *val, int len, int create) 377 { 378 int off = -1; 379 #if defined(DEBUG) 380 int i; 381 debug("Updating property '%s' = ", prop); 382 for (i = 0; i < len; i++) 383 debug(" %.2x", *(u8*)(val+i)); 384 debug("\n"); 385 #endif 386 off = fdt_node_offset_by_compatible(fdt, -1, compat); 387 while (off != -FDT_ERR_NOTFOUND) { 388 if (create || (fdt_get_property(fdt, off, prop, NULL) != NULL)) 389 fdt_setprop(fdt, off, prop, val, len); 390 off = fdt_node_offset_by_compatible(fdt, off, compat); 391 } 392 } 393 394 void do_fixup_by_compat_u32(void *fdt, const char *compat, 395 const char *prop, u32 val, int create) 396 { 397 fdt32_t tmp = cpu_to_fdt32(val); 398 do_fixup_by_compat(fdt, compat, prop, &tmp, 4, create); 399 } 400 401 #ifdef CONFIG_ARCH_FIXUP_FDT_MEMORY 402 /* 403 * fdt_pack_reg - pack address and size array into the "reg"-suitable stream 404 */ 405 static int fdt_pack_reg(const void *fdt, void *buf, u64 *address, u64 *size, 406 int n) 407 { 408 int i; 409 int address_cells = fdt_address_cells(fdt, 0); 410 int size_cells = fdt_size_cells(fdt, 0); 411 char *p = buf; 412 413 for (i = 0; i < n; i++) { 414 if (address_cells == 2) 415 *(fdt64_t *)p = cpu_to_fdt64(address[i]); 416 else 417 *(fdt32_t *)p = cpu_to_fdt32(address[i]); 418 p += 4 * address_cells; 419 420 if (size_cells == 2) 421 *(fdt64_t *)p = cpu_to_fdt64(size[i]); 422 else 423 *(fdt32_t *)p = cpu_to_fdt32(size[i]); 424 p += 4 * size_cells; 425 } 426 427 return p - (char *)buf; 428 } 429 430 int fdt_record_loadable(void *blob, u32 index, const char *name, 431 uintptr_t load_addr, u32 size, uintptr_t entry_point, 432 const char *type, const char *os) 433 { 434 int err, node; 435 436 err = fdt_check_header(blob); 437 if (err < 0) { 438 printf("%s: %s\n", __func__, fdt_strerror(err)); 439 return err; 440 } 441 442 /* find or create "/fit-images" node */ 443 node = fdt_find_or_add_subnode(blob, 0, "fit-images"); 444 if (node < 0) 445 return node; 446 447 /* find or create "/fit-images/<name>" node */ 448 node = fdt_find_or_add_subnode(blob, node, name); 449 if (node < 0) 450 return node; 451 452 /* 453 * We record these as 32bit entities, possibly truncating addresses. 454 * However, spl_fit.c is not 64bit safe either: i.e. we should not 455 * have an issue here. 456 */ 457 fdt_setprop_u32(blob, node, "load-addr", load_addr); 458 if (entry_point != -1) 459 fdt_setprop_u32(blob, node, "entry-point", entry_point); 460 fdt_setprop_u32(blob, node, "size", size); 461 if (type) 462 fdt_setprop_string(blob, node, "type", type); 463 if (os) 464 fdt_setprop_string(blob, node, "os", os); 465 466 return node; 467 } 468 469 #ifdef CONFIG_NR_DRAM_BANKS 470 #define MEMORY_BANKS_MAX CONFIG_NR_DRAM_BANKS 471 #else 472 #define MEMORY_BANKS_MAX 4 473 #endif 474 int fdt_fixup_memory_banks(void *blob, u64 start[], u64 size[], int banks) 475 { 476 int err, nodeoffset; 477 int len; 478 u8 tmp[MEMORY_BANKS_MAX * 16]; /* Up to 64-bit address + 64-bit size */ 479 480 if (banks > MEMORY_BANKS_MAX) { 481 printf("%s: num banks %d exceeds hardcoded limit %d." 482 " Recompile with higher MEMORY_BANKS_MAX?\n", 483 __FUNCTION__, banks, MEMORY_BANKS_MAX); 484 return -1; 485 } 486 487 err = fdt_check_header(blob); 488 if (err < 0) { 489 printf("%s: %s\n", __FUNCTION__, fdt_strerror(err)); 490 return err; 491 } 492 493 /* find or create "/memory" node. */ 494 nodeoffset = fdt_find_or_add_subnode(blob, 0, "memory"); 495 if (nodeoffset < 0) 496 return nodeoffset; 497 498 err = fdt_setprop(blob, nodeoffset, "device_type", "memory", 499 sizeof("memory")); 500 if (err < 0) { 501 printf("WARNING: could not set %s %s.\n", "device_type", 502 fdt_strerror(err)); 503 return err; 504 } 505 506 if (!banks) 507 return 0; 508 509 len = fdt_pack_reg(blob, tmp, start, size, banks); 510 511 err = fdt_setprop(blob, nodeoffset, "reg", tmp, len); 512 if (err < 0) { 513 printf("WARNING: could not set %s %s.\n", 514 "reg", fdt_strerror(err)); 515 return err; 516 } 517 return 0; 518 } 519 #endif 520 521 int fdt_fixup_memory(void *blob, u64 start, u64 size) 522 { 523 return fdt_fixup_memory_banks(blob, &start, &size, 1); 524 } 525 526 void fdt_fixup_ethernet(void *fdt) 527 { 528 int i = 0, j, prop; 529 char *tmp, *end; 530 char mac[16]; 531 const char *path; 532 unsigned char mac_addr[ARP_HLEN]; 533 int offset; 534 #ifdef FDT_SEQ_MACADDR_FROM_ENV 535 int nodeoff; 536 const struct fdt_property *fdt_prop; 537 #endif 538 539 if (fdt_path_offset(fdt, "/aliases") < 0) 540 return; 541 542 /* Cycle through all aliases */ 543 for (prop = 0; ; prop++) { 544 const char *name; 545 546 /* FDT might have been edited, recompute the offset */ 547 offset = fdt_first_property_offset(fdt, 548 fdt_path_offset(fdt, "/aliases")); 549 /* Select property number 'prop' */ 550 for (j = 0; j < prop; j++) 551 offset = fdt_next_property_offset(fdt, offset); 552 553 if (offset < 0) 554 break; 555 556 path = fdt_getprop_by_offset(fdt, offset, &name, NULL); 557 if (!strncmp(name, "ethernet", 8)) { 558 /* Treat plain "ethernet" same as "ethernet0". */ 559 if (!strcmp(name, "ethernet") 560 #ifdef FDT_SEQ_MACADDR_FROM_ENV 561 || !strcmp(name, "ethernet0") 562 #endif 563 ) 564 i = 0; 565 #ifndef FDT_SEQ_MACADDR_FROM_ENV 566 else 567 i = trailing_strtol(name); 568 #endif 569 if (i != -1) { 570 if (i == 0) 571 strcpy(mac, "ethaddr"); 572 else 573 sprintf(mac, "eth%daddr", i); 574 } else { 575 continue; 576 } 577 #ifdef FDT_SEQ_MACADDR_FROM_ENV 578 nodeoff = fdt_path_offset(fdt, path); 579 fdt_prop = fdt_get_property(fdt, nodeoff, "status", 580 NULL); 581 if (fdt_prop && !strcmp(fdt_prop->data, "disabled")) 582 continue; 583 i++; 584 #endif 585 tmp = env_get(mac); 586 if (!tmp) 587 continue; 588 589 for (j = 0; j < 6; j++) { 590 mac_addr[j] = tmp ? 591 simple_strtoul(tmp, &end, 16) : 0; 592 if (tmp) 593 tmp = (*end) ? end + 1 : end; 594 } 595 596 do_fixup_by_path(fdt, path, "mac-address", 597 &mac_addr, 6, 0); 598 do_fixup_by_path(fdt, path, "local-mac-address", 599 &mac_addr, 6, 1); 600 } 601 } 602 } 603 604 /* Resize the fdt to its actual size + a bit of padding */ 605 int fdt_shrink_to_minimum(void *blob, uint extrasize) 606 { 607 int i; 608 uint64_t addr, size; 609 int total, ret; 610 uint actualsize; 611 612 if (!blob) 613 return 0; 614 615 total = fdt_num_mem_rsv(blob); 616 for (i = 0; i < total; i++) { 617 fdt_get_mem_rsv(blob, i, &addr, &size); 618 if (addr == (uintptr_t)blob) { 619 fdt_del_mem_rsv(blob, i); 620 break; 621 } 622 } 623 624 /* 625 * Calculate the actual size of the fdt 626 * plus the size needed for 5 fdt_add_mem_rsv, one 627 * for the fdt itself and 4 for a possible initrd 628 * ((initrd-start + initrd-end) * 2 (name & value)) 629 */ 630 actualsize = fdt_off_dt_strings(blob) + 631 fdt_size_dt_strings(blob) + 5 * sizeof(struct fdt_reserve_entry); 632 633 actualsize += extrasize; 634 /* Make it so the fdt ends on a page boundary */ 635 actualsize = ALIGN(actualsize + ((uintptr_t)blob & 0xfff), 0x1000); 636 actualsize = actualsize - ((uintptr_t)blob & 0xfff); 637 638 /* Change the fdt header to reflect the correct size */ 639 fdt_set_totalsize(blob, actualsize); 640 641 /* Add the new reservation */ 642 ret = fdt_add_mem_rsv(blob, (uintptr_t)blob, actualsize); 643 if (ret < 0) 644 return ret; 645 646 return actualsize; 647 } 648 649 #ifdef CONFIG_PCI 650 #define CONFIG_SYS_PCI_NR_INBOUND_WIN 4 651 652 #define FDT_PCI_PREFETCH (0x40000000) 653 #define FDT_PCI_MEM32 (0x02000000) 654 #define FDT_PCI_IO (0x01000000) 655 #define FDT_PCI_MEM64 (0x03000000) 656 657 int fdt_pci_dma_ranges(void *blob, int phb_off, struct pci_controller *hose) { 658 659 int addrcell, sizecell, len, r; 660 u32 *dma_range; 661 /* sized based on pci addr cells, size-cells, & address-cells */ 662 u32 dma_ranges[(3 + 2 + 2) * CONFIG_SYS_PCI_NR_INBOUND_WIN]; 663 664 addrcell = fdt_getprop_u32_default(blob, "/", "#address-cells", 1); 665 sizecell = fdt_getprop_u32_default(blob, "/", "#size-cells", 1); 666 667 dma_range = &dma_ranges[0]; 668 for (r = 0; r < hose->region_count; r++) { 669 u64 bus_start, phys_start, size; 670 671 /* skip if !PCI_REGION_SYS_MEMORY */ 672 if (!(hose->regions[r].flags & PCI_REGION_SYS_MEMORY)) 673 continue; 674 675 bus_start = (u64)hose->regions[r].bus_start; 676 phys_start = (u64)hose->regions[r].phys_start; 677 size = (u64)hose->regions[r].size; 678 679 dma_range[0] = 0; 680 if (size >= 0x100000000ull) 681 dma_range[0] |= FDT_PCI_MEM64; 682 else 683 dma_range[0] |= FDT_PCI_MEM32; 684 if (hose->regions[r].flags & PCI_REGION_PREFETCH) 685 dma_range[0] |= FDT_PCI_PREFETCH; 686 #ifdef CONFIG_SYS_PCI_64BIT 687 dma_range[1] = bus_start >> 32; 688 #else 689 dma_range[1] = 0; 690 #endif 691 dma_range[2] = bus_start & 0xffffffff; 692 693 if (addrcell == 2) { 694 dma_range[3] = phys_start >> 32; 695 dma_range[4] = phys_start & 0xffffffff; 696 } else { 697 dma_range[3] = phys_start & 0xffffffff; 698 } 699 700 if (sizecell == 2) { 701 dma_range[3 + addrcell + 0] = size >> 32; 702 dma_range[3 + addrcell + 1] = size & 0xffffffff; 703 } else { 704 dma_range[3 + addrcell + 0] = size & 0xffffffff; 705 } 706 707 dma_range += (3 + addrcell + sizecell); 708 } 709 710 len = dma_range - &dma_ranges[0]; 711 if (len) 712 fdt_setprop(blob, phb_off, "dma-ranges", &dma_ranges[0], len*4); 713 714 return 0; 715 } 716 #endif 717 718 int fdt_increase_size(void *fdt, int add_len) 719 { 720 int newlen; 721 722 newlen = fdt_totalsize(fdt) + add_len; 723 724 /* Open in place with a new len */ 725 return fdt_open_into(fdt, fdt, newlen); 726 } 727 728 #ifdef CONFIG_FDT_FIXUP_PARTITIONS 729 #include <jffs2/load_kernel.h> 730 #include <mtd_node.h> 731 732 struct reg_cell { 733 unsigned int r0; 734 unsigned int r1; 735 }; 736 737 int fdt_del_subnodes(const void *blob, int parent_offset) 738 { 739 int off, ndepth; 740 int ret; 741 742 for (ndepth = 0, off = fdt_next_node(blob, parent_offset, &ndepth); 743 (off >= 0) && (ndepth > 0); 744 off = fdt_next_node(blob, off, &ndepth)) { 745 if (ndepth == 1) { 746 debug("delete %s: offset: %x\n", 747 fdt_get_name(blob, off, 0), off); 748 ret = fdt_del_node((void *)blob, off); 749 if (ret < 0) { 750 printf("Can't delete node: %s\n", 751 fdt_strerror(ret)); 752 return ret; 753 } else { 754 ndepth = 0; 755 off = parent_offset; 756 } 757 } 758 } 759 return 0; 760 } 761 762 int fdt_del_partitions(void *blob, int parent_offset) 763 { 764 const void *prop; 765 int ndepth = 0; 766 int off; 767 int ret; 768 769 off = fdt_next_node(blob, parent_offset, &ndepth); 770 if (off > 0 && ndepth == 1) { 771 prop = fdt_getprop(blob, off, "label", NULL); 772 if (prop == NULL) { 773 /* 774 * Could not find label property, nand {}; node? 775 * Check subnode, delete partitions there if any. 776 */ 777 return fdt_del_partitions(blob, off); 778 } else { 779 ret = fdt_del_subnodes(blob, parent_offset); 780 if (ret < 0) { 781 printf("Can't remove subnodes: %s\n", 782 fdt_strerror(ret)); 783 return ret; 784 } 785 } 786 } 787 return 0; 788 } 789 790 int fdt_node_set_part_info(void *blob, int parent_offset, 791 struct mtd_device *dev) 792 { 793 struct list_head *pentry; 794 struct part_info *part; 795 struct reg_cell cell; 796 int off, ndepth = 0; 797 int part_num, ret; 798 char buf[64]; 799 800 ret = fdt_del_partitions(blob, parent_offset); 801 if (ret < 0) 802 return ret; 803 804 /* 805 * Check if it is nand {}; subnode, adjust 806 * the offset in this case 807 */ 808 off = fdt_next_node(blob, parent_offset, &ndepth); 809 if (off > 0 && ndepth == 1) 810 parent_offset = off; 811 812 part_num = 0; 813 list_for_each_prev(pentry, &dev->parts) { 814 int newoff; 815 816 part = list_entry(pentry, struct part_info, link); 817 818 debug("%2d: %-20s0x%08llx\t0x%08llx\t%d\n", 819 part_num, part->name, part->size, 820 part->offset, part->mask_flags); 821 822 sprintf(buf, "partition@%llx", part->offset); 823 add_sub: 824 ret = fdt_add_subnode(blob, parent_offset, buf); 825 if (ret == -FDT_ERR_NOSPACE) { 826 ret = fdt_increase_size(blob, 512); 827 if (!ret) 828 goto add_sub; 829 else 830 goto err_size; 831 } else if (ret < 0) { 832 printf("Can't add partition node: %s\n", 833 fdt_strerror(ret)); 834 return ret; 835 } 836 newoff = ret; 837 838 /* Check MTD_WRITEABLE_CMD flag */ 839 if (part->mask_flags & 1) { 840 add_ro: 841 ret = fdt_setprop(blob, newoff, "read_only", NULL, 0); 842 if (ret == -FDT_ERR_NOSPACE) { 843 ret = fdt_increase_size(blob, 512); 844 if (!ret) 845 goto add_ro; 846 else 847 goto err_size; 848 } else if (ret < 0) 849 goto err_prop; 850 } 851 852 cell.r0 = cpu_to_fdt32(part->offset); 853 cell.r1 = cpu_to_fdt32(part->size); 854 add_reg: 855 ret = fdt_setprop(blob, newoff, "reg", &cell, sizeof(cell)); 856 if (ret == -FDT_ERR_NOSPACE) { 857 ret = fdt_increase_size(blob, 512); 858 if (!ret) 859 goto add_reg; 860 else 861 goto err_size; 862 } else if (ret < 0) 863 goto err_prop; 864 865 add_label: 866 ret = fdt_setprop_string(blob, newoff, "label", part->name); 867 if (ret == -FDT_ERR_NOSPACE) { 868 ret = fdt_increase_size(blob, 512); 869 if (!ret) 870 goto add_label; 871 else 872 goto err_size; 873 } else if (ret < 0) 874 goto err_prop; 875 876 part_num++; 877 } 878 return 0; 879 err_size: 880 printf("Can't increase blob size: %s\n", fdt_strerror(ret)); 881 return ret; 882 err_prop: 883 printf("Can't add property: %s\n", fdt_strerror(ret)); 884 return ret; 885 } 886 887 /* 888 * Update partitions in nor/nand nodes using info from 889 * mtdparts environment variable. The nodes to update are 890 * specified by node_info structure which contains mtd device 891 * type and compatible string: E. g. the board code in 892 * ft_board_setup() could use: 893 * 894 * struct node_info nodes[] = { 895 * { "fsl,mpc5121-nfc", MTD_DEV_TYPE_NAND, }, 896 * { "cfi-flash", MTD_DEV_TYPE_NOR, }, 897 * }; 898 * 899 * fdt_fixup_mtdparts(blob, nodes, ARRAY_SIZE(nodes)); 900 */ 901 void fdt_fixup_mtdparts(void *blob, void *node_info, int node_info_size) 902 { 903 struct node_info *ni = node_info; 904 struct mtd_device *dev; 905 int i, idx; 906 int noff; 907 908 if (mtdparts_init() != 0) 909 return; 910 911 for (i = 0; i < node_info_size; i++) { 912 idx = 0; 913 noff = fdt_node_offset_by_compatible(blob, -1, ni[i].compat); 914 while (noff != -FDT_ERR_NOTFOUND) { 915 debug("%s: %s, mtd dev type %d\n", 916 fdt_get_name(blob, noff, 0), 917 ni[i].compat, ni[i].type); 918 dev = device_find(ni[i].type, idx++); 919 if (dev) { 920 if (fdt_node_set_part_info(blob, noff, dev)) 921 return; /* return on error */ 922 } 923 924 /* Jump to next flash node */ 925 noff = fdt_node_offset_by_compatible(blob, noff, 926 ni[i].compat); 927 } 928 } 929 } 930 #endif 931 932 void fdt_del_node_and_alias(void *blob, const char *alias) 933 { 934 int off = fdt_path_offset(blob, alias); 935 936 if (off < 0) 937 return; 938 939 fdt_del_node(blob, off); 940 941 off = fdt_path_offset(blob, "/aliases"); 942 fdt_delprop(blob, off, alias); 943 } 944 945 /* Max address size we deal with */ 946 #define OF_MAX_ADDR_CELLS 4 947 #define OF_BAD_ADDR FDT_ADDR_T_NONE 948 #define OF_CHECK_COUNTS(na, ns) ((na) > 0 && (na) <= OF_MAX_ADDR_CELLS && \ 949 (ns) > 0) 950 951 /* Debug utility */ 952 #ifdef DEBUG 953 static void of_dump_addr(const char *s, const fdt32_t *addr, int na) 954 { 955 printf("%s", s); 956 while(na--) 957 printf(" %08x", *(addr++)); 958 printf("\n"); 959 } 960 #else 961 static void of_dump_addr(const char *s, const fdt32_t *addr, int na) { } 962 #endif 963 964 /** 965 * struct of_bus - Callbacks for bus specific translators 966 * @name: A string used to identify this bus in debug output. 967 * @addresses: The name of the DT property from which addresses are 968 * to be read, typically "reg". 969 * @match: Return non-zero if the node whose parent is at 970 * parentoffset in the FDT blob corresponds to a bus 971 * of this type, otherwise return zero. If NULL a match 972 * is assumed. 973 * @count_cells:Count how many cells (be32 values) a node whose parent 974 * is at parentoffset in the FDT blob will require to 975 * represent its address (written to *addrc) & size 976 * (written to *sizec). 977 * @map: Map the address addr from the address space of this 978 * bus to that of its parent, making use of the ranges 979 * read from DT to an array at range. na and ns are the 980 * number of cells (be32 values) used to hold and address 981 * or size, respectively, for this bus. pna is the number 982 * of cells used to hold an address for the parent bus. 983 * Returns the address in the address space of the parent 984 * bus. 985 * @translate: Update the value of the address cells at addr within an 986 * FDT by adding offset to it. na specifies the number of 987 * cells used to hold the address being translated. Returns 988 * zero on success, non-zero on error. 989 * 990 * Each bus type will include a struct of_bus in the of_busses array, 991 * providing implementations of some or all of the functions used to 992 * match the bus & handle address translation for its children. 993 */ 994 struct of_bus { 995 const char *name; 996 const char *addresses; 997 int (*match)(const void *blob, int parentoffset); 998 void (*count_cells)(const void *blob, int parentoffset, 999 int *addrc, int *sizec); 1000 u64 (*map)(fdt32_t *addr, const fdt32_t *range, 1001 int na, int ns, int pna); 1002 int (*translate)(fdt32_t *addr, u64 offset, int na); 1003 }; 1004 1005 /* Default translator (generic bus) */ 1006 void fdt_support_default_count_cells(const void *blob, int parentoffset, 1007 int *addrc, int *sizec) 1008 { 1009 const fdt32_t *prop; 1010 1011 if (addrc) 1012 *addrc = fdt_address_cells(blob, parentoffset); 1013 1014 if (sizec) { 1015 prop = fdt_getprop(blob, parentoffset, "#size-cells", NULL); 1016 if (prop) 1017 *sizec = be32_to_cpup(prop); 1018 else 1019 *sizec = 1; 1020 } 1021 } 1022 1023 static u64 of_bus_default_map(fdt32_t *addr, const fdt32_t *range, 1024 int na, int ns, int pna) 1025 { 1026 u64 cp, s, da; 1027 1028 cp = fdt_read_number(range, na); 1029 s = fdt_read_number(range + na + pna, ns); 1030 da = fdt_read_number(addr, na); 1031 1032 debug("OF: default map, cp=%" PRIu64 ", s=%" PRIu64 1033 ", da=%" PRIu64 "\n", cp, s, da); 1034 1035 if (da < cp || da >= (cp + s)) 1036 return OF_BAD_ADDR; 1037 return da - cp; 1038 } 1039 1040 static int of_bus_default_translate(fdt32_t *addr, u64 offset, int na) 1041 { 1042 u64 a = fdt_read_number(addr, na); 1043 memset(addr, 0, na * 4); 1044 a += offset; 1045 if (na > 1) 1046 addr[na - 2] = cpu_to_fdt32(a >> 32); 1047 addr[na - 1] = cpu_to_fdt32(a & 0xffffffffu); 1048 1049 return 0; 1050 } 1051 1052 #ifdef CONFIG_OF_ISA_BUS 1053 1054 /* ISA bus translator */ 1055 static int of_bus_isa_match(const void *blob, int parentoffset) 1056 { 1057 const char *name; 1058 1059 name = fdt_get_name(blob, parentoffset, NULL); 1060 if (!name) 1061 return 0; 1062 1063 return !strcmp(name, "isa"); 1064 } 1065 1066 static void of_bus_isa_count_cells(const void *blob, int parentoffset, 1067 int *addrc, int *sizec) 1068 { 1069 if (addrc) 1070 *addrc = 2; 1071 if (sizec) 1072 *sizec = 1; 1073 } 1074 1075 static u64 of_bus_isa_map(fdt32_t *addr, const fdt32_t *range, 1076 int na, int ns, int pna) 1077 { 1078 u64 cp, s, da; 1079 1080 /* Check address type match */ 1081 if ((addr[0] ^ range[0]) & cpu_to_be32(1)) 1082 return OF_BAD_ADDR; 1083 1084 cp = fdt_read_number(range + 1, na - 1); 1085 s = fdt_read_number(range + na + pna, ns); 1086 da = fdt_read_number(addr + 1, na - 1); 1087 1088 debug("OF: ISA map, cp=%" PRIu64 ", s=%" PRIu64 1089 ", da=%" PRIu64 "\n", cp, s, da); 1090 1091 if (da < cp || da >= (cp + s)) 1092 return OF_BAD_ADDR; 1093 return da - cp; 1094 } 1095 1096 static int of_bus_isa_translate(fdt32_t *addr, u64 offset, int na) 1097 { 1098 return of_bus_default_translate(addr + 1, offset, na - 1); 1099 } 1100 1101 #endif /* CONFIG_OF_ISA_BUS */ 1102 1103 /* Array of bus specific translators */ 1104 static struct of_bus of_busses[] = { 1105 #ifdef CONFIG_OF_ISA_BUS 1106 /* ISA */ 1107 { 1108 .name = "isa", 1109 .addresses = "reg", 1110 .match = of_bus_isa_match, 1111 .count_cells = of_bus_isa_count_cells, 1112 .map = of_bus_isa_map, 1113 .translate = of_bus_isa_translate, 1114 }, 1115 #endif /* CONFIG_OF_ISA_BUS */ 1116 /* Default */ 1117 { 1118 .name = "default", 1119 .addresses = "reg", 1120 .count_cells = fdt_support_default_count_cells, 1121 .map = of_bus_default_map, 1122 .translate = of_bus_default_translate, 1123 }, 1124 }; 1125 1126 static struct of_bus *of_match_bus(const void *blob, int parentoffset) 1127 { 1128 struct of_bus *bus; 1129 1130 if (ARRAY_SIZE(of_busses) == 1) 1131 return of_busses; 1132 1133 for (bus = of_busses; bus; bus++) { 1134 if (!bus->match || bus->match(blob, parentoffset)) 1135 return bus; 1136 } 1137 1138 /* 1139 * We should always have matched the default bus at least, since 1140 * it has a NULL match field. If we didn't then it somehow isn't 1141 * in the of_busses array or something equally catastrophic has 1142 * gone wrong. 1143 */ 1144 assert(0); 1145 return NULL; 1146 } 1147 1148 static int of_translate_one(const void *blob, int parent, struct of_bus *bus, 1149 struct of_bus *pbus, fdt32_t *addr, 1150 int na, int ns, int pna, const char *rprop) 1151 { 1152 const fdt32_t *ranges; 1153 int rlen; 1154 int rone; 1155 u64 offset = OF_BAD_ADDR; 1156 1157 /* Normally, an absence of a "ranges" property means we are 1158 * crossing a non-translatable boundary, and thus the addresses 1159 * below the current not cannot be converted to CPU physical ones. 1160 * Unfortunately, while this is very clear in the spec, it's not 1161 * what Apple understood, and they do have things like /uni-n or 1162 * /ht nodes with no "ranges" property and a lot of perfectly 1163 * useable mapped devices below them. Thus we treat the absence of 1164 * "ranges" as equivalent to an empty "ranges" property which means 1165 * a 1:1 translation at that level. It's up to the caller not to try 1166 * to translate addresses that aren't supposed to be translated in 1167 * the first place. --BenH. 1168 */ 1169 ranges = fdt_getprop(blob, parent, rprop, &rlen); 1170 if (ranges == NULL || rlen == 0) { 1171 offset = fdt_read_number(addr, na); 1172 memset(addr, 0, pna * 4); 1173 debug("OF: no ranges, 1:1 translation\n"); 1174 goto finish; 1175 } 1176 1177 debug("OF: walking ranges...\n"); 1178 1179 /* Now walk through the ranges */ 1180 rlen /= 4; 1181 rone = na + pna + ns; 1182 for (; rlen >= rone; rlen -= rone, ranges += rone) { 1183 offset = bus->map(addr, ranges, na, ns, pna); 1184 if (offset != OF_BAD_ADDR) 1185 break; 1186 } 1187 if (offset == OF_BAD_ADDR) { 1188 debug("OF: not found !\n"); 1189 return 1; 1190 } 1191 memcpy(addr, ranges + na, 4 * pna); 1192 1193 finish: 1194 of_dump_addr("OF: parent translation for:", addr, pna); 1195 debug("OF: with offset: %" PRIu64 "\n", offset); 1196 1197 /* Translate it into parent bus space */ 1198 return pbus->translate(addr, offset, pna); 1199 } 1200 1201 /* 1202 * Translate an address from the device-tree into a CPU physical address, 1203 * this walks up the tree and applies the various bus mappings on the 1204 * way. 1205 * 1206 * Note: We consider that crossing any level with #size-cells == 0 to mean 1207 * that translation is impossible (that is we are not dealing with a value 1208 * that can be mapped to a cpu physical address). This is not really specified 1209 * that way, but this is traditionally the way IBM at least do things 1210 */ 1211 static u64 __of_translate_address(const void *blob, int node_offset, 1212 const fdt32_t *in_addr, const char *rprop) 1213 { 1214 int parent; 1215 struct of_bus *bus, *pbus; 1216 fdt32_t addr[OF_MAX_ADDR_CELLS]; 1217 int na, ns, pna, pns; 1218 u64 result = OF_BAD_ADDR; 1219 1220 debug("OF: ** translation for device %s **\n", 1221 fdt_get_name(blob, node_offset, NULL)); 1222 1223 /* Get parent & match bus type */ 1224 parent = fdt_parent_offset(blob, node_offset); 1225 if (parent < 0) 1226 goto bail; 1227 bus = of_match_bus(blob, parent); 1228 1229 /* Cound address cells & copy address locally */ 1230 bus->count_cells(blob, parent, &na, &ns); 1231 if (!OF_CHECK_COUNTS(na, ns)) { 1232 printf("%s: Bad cell count for %s\n", __FUNCTION__, 1233 fdt_get_name(blob, node_offset, NULL)); 1234 goto bail; 1235 } 1236 memcpy(addr, in_addr, na * 4); 1237 1238 debug("OF: bus is %s (na=%d, ns=%d) on %s\n", 1239 bus->name, na, ns, fdt_get_name(blob, parent, NULL)); 1240 of_dump_addr("OF: translating address:", addr, na); 1241 1242 /* Translate */ 1243 for (;;) { 1244 /* Switch to parent bus */ 1245 node_offset = parent; 1246 parent = fdt_parent_offset(blob, node_offset); 1247 1248 /* If root, we have finished */ 1249 if (parent < 0) { 1250 debug("OF: reached root node\n"); 1251 result = fdt_read_number(addr, na); 1252 break; 1253 } 1254 1255 /* Get new parent bus and counts */ 1256 pbus = of_match_bus(blob, parent); 1257 pbus->count_cells(blob, parent, &pna, &pns); 1258 if (!OF_CHECK_COUNTS(pna, pns)) { 1259 printf("%s: Bad cell count for %s\n", __FUNCTION__, 1260 fdt_get_name(blob, node_offset, NULL)); 1261 break; 1262 } 1263 1264 debug("OF: parent bus is %s (na=%d, ns=%d) on %s\n", 1265 pbus->name, pna, pns, fdt_get_name(blob, parent, NULL)); 1266 1267 /* Apply bus translation */ 1268 if (of_translate_one(blob, node_offset, bus, pbus, 1269 addr, na, ns, pna, rprop)) 1270 break; 1271 1272 /* Complete the move up one level */ 1273 na = pna; 1274 ns = pns; 1275 bus = pbus; 1276 1277 of_dump_addr("OF: one level translation:", addr, na); 1278 } 1279 bail: 1280 1281 return result; 1282 } 1283 1284 u64 fdt_translate_address(const void *blob, int node_offset, 1285 const fdt32_t *in_addr) 1286 { 1287 return __of_translate_address(blob, node_offset, in_addr, "ranges"); 1288 } 1289 1290 /** 1291 * fdt_node_offset_by_compat_reg: Find a node that matches compatiable and 1292 * who's reg property matches a physical cpu address 1293 * 1294 * @blob: ptr to device tree 1295 * @compat: compatiable string to match 1296 * @compat_off: property name 1297 * 1298 */ 1299 int fdt_node_offset_by_compat_reg(void *blob, const char *compat, 1300 phys_addr_t compat_off) 1301 { 1302 int len, off = fdt_node_offset_by_compatible(blob, -1, compat); 1303 while (off != -FDT_ERR_NOTFOUND) { 1304 const fdt32_t *reg = fdt_getprop(blob, off, "reg", &len); 1305 if (reg) { 1306 if (compat_off == fdt_translate_address(blob, off, reg)) 1307 return off; 1308 } 1309 off = fdt_node_offset_by_compatible(blob, off, compat); 1310 } 1311 1312 return -FDT_ERR_NOTFOUND; 1313 } 1314 1315 /** 1316 * fdt_alloc_phandle: Return next free phandle value 1317 * 1318 * @blob: ptr to device tree 1319 */ 1320 int fdt_alloc_phandle(void *blob) 1321 { 1322 int offset; 1323 uint32_t phandle = 0; 1324 1325 for (offset = fdt_next_node(blob, -1, NULL); offset >= 0; 1326 offset = fdt_next_node(blob, offset, NULL)) { 1327 phandle = max(phandle, fdt_get_phandle(blob, offset)); 1328 } 1329 1330 return phandle + 1; 1331 } 1332 1333 /* 1334 * fdt_set_phandle: Create a phandle property for the given node 1335 * 1336 * @fdt: ptr to device tree 1337 * @nodeoffset: node to update 1338 * @phandle: phandle value to set (must be unique) 1339 */ 1340 int fdt_set_phandle(void *fdt, int nodeoffset, uint32_t phandle) 1341 { 1342 int ret; 1343 1344 #ifdef DEBUG 1345 int off = fdt_node_offset_by_phandle(fdt, phandle); 1346 1347 if ((off >= 0) && (off != nodeoffset)) { 1348 char buf[64]; 1349 1350 fdt_get_path(fdt, nodeoffset, buf, sizeof(buf)); 1351 printf("Trying to update node %s with phandle %u ", 1352 buf, phandle); 1353 1354 fdt_get_path(fdt, off, buf, sizeof(buf)); 1355 printf("that already exists in node %s.\n", buf); 1356 return -FDT_ERR_BADPHANDLE; 1357 } 1358 #endif 1359 1360 ret = fdt_setprop_cell(fdt, nodeoffset, "phandle", phandle); 1361 if (ret < 0) 1362 return ret; 1363 1364 /* 1365 * For now, also set the deprecated "linux,phandle" property, so that we 1366 * don't break older kernels. 1367 */ 1368 ret = fdt_setprop_cell(fdt, nodeoffset, "linux,phandle", phandle); 1369 1370 return ret; 1371 } 1372 1373 /* 1374 * fdt_create_phandle: Create a phandle property for the given node 1375 * 1376 * @fdt: ptr to device tree 1377 * @nodeoffset: node to update 1378 */ 1379 unsigned int fdt_create_phandle(void *fdt, int nodeoffset) 1380 { 1381 /* see if there is a phandle already */ 1382 int phandle = fdt_get_phandle(fdt, nodeoffset); 1383 1384 /* if we got 0, means no phandle so create one */ 1385 if (phandle == 0) { 1386 int ret; 1387 1388 phandle = fdt_alloc_phandle(fdt); 1389 ret = fdt_set_phandle(fdt, nodeoffset, phandle); 1390 if (ret < 0) { 1391 printf("Can't set phandle %u: %s\n", phandle, 1392 fdt_strerror(ret)); 1393 return 0; 1394 } 1395 } 1396 1397 return phandle; 1398 } 1399 1400 /* 1401 * fdt_set_node_status: Set status for the given node 1402 * 1403 * @fdt: ptr to device tree 1404 * @nodeoffset: node to update 1405 * @status: FDT_STATUS_OKAY, FDT_STATUS_DISABLED, 1406 * FDT_STATUS_FAIL, FDT_STATUS_FAIL_ERROR_CODE 1407 * @error_code: optional, only used if status is FDT_STATUS_FAIL_ERROR_CODE 1408 */ 1409 int fdt_set_node_status(void *fdt, int nodeoffset, 1410 enum fdt_status status, unsigned int error_code) 1411 { 1412 char buf[16]; 1413 int ret = 0; 1414 1415 if (nodeoffset < 0) 1416 return nodeoffset; 1417 1418 switch (status) { 1419 case FDT_STATUS_OKAY: 1420 ret = fdt_setprop_string(fdt, nodeoffset, "status", "okay"); 1421 break; 1422 case FDT_STATUS_DISABLED: 1423 ret = fdt_setprop_string(fdt, nodeoffset, "status", "disabled"); 1424 break; 1425 case FDT_STATUS_FAIL: 1426 ret = fdt_setprop_string(fdt, nodeoffset, "status", "fail"); 1427 break; 1428 case FDT_STATUS_FAIL_ERROR_CODE: 1429 sprintf(buf, "fail-%d", error_code); 1430 ret = fdt_setprop_string(fdt, nodeoffset, "status", buf); 1431 break; 1432 default: 1433 printf("Invalid fdt status: %x\n", status); 1434 ret = -1; 1435 break; 1436 } 1437 1438 return ret; 1439 } 1440 1441 /* 1442 * fdt_set_status_by_alias: Set status for the given node given an alias 1443 * 1444 * @fdt: ptr to device tree 1445 * @alias: alias of node to update 1446 * @status: FDT_STATUS_OKAY, FDT_STATUS_DISABLED, 1447 * FDT_STATUS_FAIL, FDT_STATUS_FAIL_ERROR_CODE 1448 * @error_code: optional, only used if status is FDT_STATUS_FAIL_ERROR_CODE 1449 */ 1450 int fdt_set_status_by_alias(void *fdt, const char* alias, 1451 enum fdt_status status, unsigned int error_code) 1452 { 1453 int offset = fdt_path_offset(fdt, alias); 1454 1455 return fdt_set_node_status(fdt, offset, status, error_code); 1456 } 1457 1458 #if defined(CONFIG_VIDEO) || defined(CONFIG_LCD) 1459 int fdt_add_edid(void *blob, const char *compat, unsigned char *edid_buf) 1460 { 1461 int noff; 1462 int ret; 1463 1464 noff = fdt_node_offset_by_compatible(blob, -1, compat); 1465 if (noff != -FDT_ERR_NOTFOUND) { 1466 debug("%s: %s\n", fdt_get_name(blob, noff, 0), compat); 1467 add_edid: 1468 ret = fdt_setprop(blob, noff, "edid", edid_buf, 128); 1469 if (ret == -FDT_ERR_NOSPACE) { 1470 ret = fdt_increase_size(blob, 512); 1471 if (!ret) 1472 goto add_edid; 1473 else 1474 goto err_size; 1475 } else if (ret < 0) { 1476 printf("Can't add property: %s\n", fdt_strerror(ret)); 1477 return ret; 1478 } 1479 } 1480 return 0; 1481 err_size: 1482 printf("Can't increase blob size: %s\n", fdt_strerror(ret)); 1483 return ret; 1484 } 1485 #endif 1486 1487 /* 1488 * Verify the physical address of device tree node for a given alias 1489 * 1490 * This function locates the device tree node of a given alias, and then 1491 * verifies that the physical address of that device matches the given 1492 * parameter. It displays a message if there is a mismatch. 1493 * 1494 * Returns 1 on success, 0 on failure 1495 */ 1496 int fdt_verify_alias_address(void *fdt, int anode, const char *alias, u64 addr) 1497 { 1498 const char *path; 1499 const fdt32_t *reg; 1500 int node, len; 1501 u64 dt_addr; 1502 1503 path = fdt_getprop(fdt, anode, alias, NULL); 1504 if (!path) { 1505 /* If there's no such alias, then it's not a failure */ 1506 return 1; 1507 } 1508 1509 node = fdt_path_offset(fdt, path); 1510 if (node < 0) { 1511 printf("Warning: device tree alias '%s' points to invalid " 1512 "node %s.\n", alias, path); 1513 return 0; 1514 } 1515 1516 reg = fdt_getprop(fdt, node, "reg", &len); 1517 if (!reg) { 1518 printf("Warning: device tree node '%s' has no address.\n", 1519 path); 1520 return 0; 1521 } 1522 1523 dt_addr = fdt_translate_address(fdt, node, reg); 1524 if (addr != dt_addr) { 1525 printf("Warning: U-Boot configured device %s at address %" 1526 PRIx64 ",\n but the device tree has it address %" 1527 PRIx64 ".\n", alias, addr, dt_addr); 1528 return 0; 1529 } 1530 1531 return 1; 1532 } 1533 1534 /* 1535 * Returns the base address of an SOC or PCI node 1536 */ 1537 u64 fdt_get_base_address(const void *fdt, int node) 1538 { 1539 int size; 1540 const fdt32_t *prop; 1541 1542 prop = fdt_getprop(fdt, node, "reg", &size); 1543 1544 return prop ? fdt_translate_address(fdt, node, prop) : 0; 1545 } 1546 1547 /* 1548 * Read a property of size <prop_len>. Currently only supports 1 or 2 cells. 1549 */ 1550 static int fdt_read_prop(const fdt32_t *prop, int prop_len, int cell_off, 1551 uint64_t *val, int cells) 1552 { 1553 const fdt32_t *prop32 = &prop[cell_off]; 1554 const fdt64_t *prop64 = (const fdt64_t *)&prop[cell_off]; 1555 1556 if ((cell_off + cells) > prop_len) 1557 return -FDT_ERR_NOSPACE; 1558 1559 switch (cells) { 1560 case 1: 1561 *val = fdt32_to_cpu(*prop32); 1562 break; 1563 case 2: 1564 *val = fdt64_to_cpu(*prop64); 1565 break; 1566 default: 1567 return -FDT_ERR_NOSPACE; 1568 } 1569 1570 return 0; 1571 } 1572 1573 /** 1574 * fdt_read_range - Read a node's n'th range property 1575 * 1576 * @fdt: ptr to device tree 1577 * @node: offset of node 1578 * @n: range index 1579 * @child_addr: pointer to storage for the "child address" field 1580 * @addr: pointer to storage for the CPU view translated physical start 1581 * @len: pointer to storage for the range length 1582 * 1583 * Convenience function that reads and interprets a specific range out of 1584 * a number of the "ranges" property array. 1585 */ 1586 int fdt_read_range(void *fdt, int node, int n, uint64_t *child_addr, 1587 uint64_t *addr, uint64_t *len) 1588 { 1589 int pnode = fdt_parent_offset(fdt, node); 1590 const fdt32_t *ranges; 1591 int pacells; 1592 int acells; 1593 int scells; 1594 int ranges_len; 1595 int cell = 0; 1596 int r = 0; 1597 1598 /* 1599 * The "ranges" property is an array of 1600 * { <child address> <parent address> <size in child address space> } 1601 * 1602 * All 3 elements can span a diffent number of cells. Fetch their size. 1603 */ 1604 pacells = fdt_getprop_u32_default_node(fdt, pnode, 0, "#address-cells", 1); 1605 acells = fdt_getprop_u32_default_node(fdt, node, 0, "#address-cells", 1); 1606 scells = fdt_getprop_u32_default_node(fdt, node, 0, "#size-cells", 1); 1607 1608 /* Now try to get the ranges property */ 1609 ranges = fdt_getprop(fdt, node, "ranges", &ranges_len); 1610 if (!ranges) 1611 return -FDT_ERR_NOTFOUND; 1612 ranges_len /= sizeof(uint32_t); 1613 1614 /* Jump to the n'th entry */ 1615 cell = n * (pacells + acells + scells); 1616 1617 /* Read <child address> */ 1618 if (child_addr) { 1619 r = fdt_read_prop(ranges, ranges_len, cell, child_addr, 1620 acells); 1621 if (r) 1622 return r; 1623 } 1624 cell += acells; 1625 1626 /* Read <parent address> */ 1627 if (addr) 1628 *addr = fdt_translate_address(fdt, node, ranges + cell); 1629 cell += pacells; 1630 1631 /* Read <size in child address space> */ 1632 if (len) { 1633 r = fdt_read_prop(ranges, ranges_len, cell, len, scells); 1634 if (r) 1635 return r; 1636 } 1637 1638 return 0; 1639 } 1640 1641 /** 1642 * fdt_setup_simplefb_node - Fill and enable a simplefb node 1643 * 1644 * @fdt: ptr to device tree 1645 * @node: offset of the simplefb node 1646 * @base_address: framebuffer base address 1647 * @width: width in pixels 1648 * @height: height in pixels 1649 * @stride: bytes per line 1650 * @format: pixel format string 1651 * 1652 * Convenience function to fill and enable a simplefb node. 1653 */ 1654 int fdt_setup_simplefb_node(void *fdt, int node, u64 base_address, u32 width, 1655 u32 height, u32 stride, const char *format) 1656 { 1657 char name[32]; 1658 fdt32_t cells[4]; 1659 int i, addrc, sizec, ret; 1660 1661 fdt_support_default_count_cells(fdt, fdt_parent_offset(fdt, node), 1662 &addrc, &sizec); 1663 i = 0; 1664 if (addrc == 2) 1665 cells[i++] = cpu_to_fdt32(base_address >> 32); 1666 cells[i++] = cpu_to_fdt32(base_address); 1667 if (sizec == 2) 1668 cells[i++] = 0; 1669 cells[i++] = cpu_to_fdt32(height * stride); 1670 1671 ret = fdt_setprop(fdt, node, "reg", cells, sizeof(cells[0]) * i); 1672 if (ret < 0) 1673 return ret; 1674 1675 snprintf(name, sizeof(name), "framebuffer@%" PRIx64, base_address); 1676 ret = fdt_set_name(fdt, node, name); 1677 if (ret < 0) 1678 return ret; 1679 1680 ret = fdt_setprop_u32(fdt, node, "width", width); 1681 if (ret < 0) 1682 return ret; 1683 1684 ret = fdt_setprop_u32(fdt, node, "height", height); 1685 if (ret < 0) 1686 return ret; 1687 1688 ret = fdt_setprop_u32(fdt, node, "stride", stride); 1689 if (ret < 0) 1690 return ret; 1691 1692 ret = fdt_setprop_string(fdt, node, "format", format); 1693 if (ret < 0) 1694 return ret; 1695 1696 ret = fdt_setprop_string(fdt, node, "status", "okay"); 1697 if (ret < 0) 1698 return ret; 1699 1700 return 0; 1701 } 1702 1703 /* 1704 * Update native-mode in display-timings from display environment variable. 1705 * The node to update are specified by path. 1706 */ 1707 int fdt_fixup_display(void *blob, const char *path, const char *display) 1708 { 1709 int off, toff; 1710 1711 if (!display || !path) 1712 return -FDT_ERR_NOTFOUND; 1713 1714 toff = fdt_path_offset(blob, path); 1715 if (toff >= 0) 1716 toff = fdt_subnode_offset(blob, toff, "display-timings"); 1717 if (toff < 0) 1718 return toff; 1719 1720 for (off = fdt_first_subnode(blob, toff); 1721 off >= 0; 1722 off = fdt_next_subnode(blob, off)) { 1723 uint32_t h = fdt_get_phandle(blob, off); 1724 debug("%s:0x%x\n", fdt_get_name(blob, off, NULL), 1725 fdt32_to_cpu(h)); 1726 if (strcasecmp(fdt_get_name(blob, off, NULL), display) == 0) 1727 return fdt_setprop_u32(blob, toff, "native-mode", h); 1728 } 1729 return toff; 1730 } 1731 1732 #ifdef CONFIG_OF_LIBFDT_OVERLAY 1733 /** 1734 * fdt_overlay_apply_verbose - Apply an overlay with verbose error reporting 1735 * 1736 * @fdt: ptr to device tree 1737 * @fdto: ptr to device tree overlay 1738 * 1739 * Convenience function to apply an overlay and display helpful messages 1740 * in the case of an error 1741 */ 1742 int fdt_overlay_apply_verbose(void *fdt, void *fdto) 1743 { 1744 int err; 1745 bool has_symbols; 1746 1747 err = fdt_path_offset(fdt, "/__symbols__"); 1748 has_symbols = err >= 0; 1749 1750 err = fdt_overlay_apply(fdt, fdto); 1751 if (err < 0) { 1752 printf("failed on fdt_overlay_apply(): %s\n", 1753 fdt_strerror(err)); 1754 if (!has_symbols) { 1755 printf("base fdt does did not have a /__symbols__ node\n"); 1756 printf("make sure you've compiled with -@\n"); 1757 } 1758 } 1759 return err; 1760 } 1761 #endif 1762