3 * Gerald Van Baren, Custom IDEAS, vanbaren@cideas.com
5 * Copyright 2010-2011 Freescale Semiconductor, Inc.
7 * SPDX-License-Identifier: GPL-2.0+
12 #include <stdio_dev.h>
13 #include <linux/ctype.h>
14 #include <linux/types.h>
15 #include <asm/global_data.h>
17 #include <fdt_support.h>
22 * fdt_getprop_u32_default_node - Return a node's property or a default
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
30 * Convenience function to return a node's property or a default value if
31 * the property doesn't exist.
33 u32 fdt_getprop_u32_default_node(const void *fdt, int off, int cell,
34 const char *prop, const u32 dflt)
39 val = fdt_getprop(fdt, off, prop, &len);
41 /* Check if property exists */
45 /* Check if property is long enough */
46 if (len < ((cell + 1) * sizeof(uint32_t)))
49 return fdt32_to_cpu(*val);
53 * fdt_getprop_u32_default - Find a node and return it's property or a default
55 * @fdt: ptr to device tree
57 * @prop: property name
58 * @dflt: default value if the property isn't found
60 * Convenience function to find a node and return it's property or a
61 * default value if it doesn't exist.
63 u32 fdt_getprop_u32_default(const void *fdt, const char *path,
64 const char *prop, const u32 dflt)
68 off = fdt_path_offset(fdt, path);
72 return fdt_getprop_u32_default_node(fdt, off, 0, prop, dflt);
76 * fdt_find_and_setprop: Find a node and set it's property
78 * @fdt: ptr to device tree
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
85 * Convenience function to directly set a property given the path to the node.
87 int fdt_find_and_setprop(void *fdt, const char *node, const char *prop,
88 const void *val, int len, int create)
90 int nodeoff = fdt_path_offset(fdt, node);
95 if ((!create) && (fdt_get_property(fdt, nodeoff, prop, NULL) == NULL))
96 return 0; /* create flag not set; so exit quietly */
98 return fdt_setprop(fdt, nodeoff, prop, val, len);
102 * fdt_find_or_add_subnode() - find or possibly add a subnode of a given node
104 * @fdt: pointer to the device tree blob
105 * @parentoffset: structure block offset of a node
106 * @name: name of the subnode to locate
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.
111 int fdt_find_or_add_subnode(void *fdt, int parentoffset, const char *name)
115 offset = fdt_subnode_offset(fdt, parentoffset, name);
117 if (offset == -FDT_ERR_NOTFOUND)
118 offset = fdt_add_subnode(fdt, parentoffset, name);
121 printf("%s: %s: %s\n", __func__, name, fdt_strerror(offset));
126 /* rename to CONFIG_OF_STDOUT_PATH ? */
127 #if defined(OF_STDOUT_PATH)
128 static int fdt_fixup_stdout(void *fdt, int chosenoff)
130 return fdt_setprop(fdt, chosenoff, "linux,stdout-path",
131 OF_STDOUT_PATH, strlen(OF_STDOUT_PATH) + 1);
133 #elif defined(CONFIG_OF_STDOUT_VIA_ALIAS) && defined(CONFIG_CONS_INDEX)
134 static int fdt_fixup_stdout(void *fdt, int chosenoff)
138 char sername[9] = { 0 };
141 char tmp[256]; /* long enough */
143 sprintf(sername, "serial%d", CONFIG_CONS_INDEX - 1);
145 aliasoff = fdt_path_offset(fdt, "/aliases");
151 path = fdt_getprop(fdt, aliasoff, sername, &len);
157 /* fdt_setprop may break "path" so we copy it to tmp buffer */
158 memcpy(tmp, path, len);
160 err = fdt_setprop(fdt, chosenoff, "linux,stdout-path", tmp, len);
162 printf("WARNING: could not set linux,stdout-path %s.\n",
168 printf("WARNING: %s: could not read %s alias: %s\n",
169 __func__, sername, fdt_strerror(err));
174 static int fdt_fixup_stdout(void *fdt, int chosenoff)
180 static inline int fdt_setprop_uxx(void *fdt, int nodeoffset, const char *name,
181 uint64_t val, int is_u64)
184 return fdt_setprop_u64(fdt, nodeoffset, name, val);
186 return fdt_setprop_u32(fdt, nodeoffset, name, (uint32_t)val);
189 int fdt_root(void *fdt)
194 err = fdt_check_header(fdt);
196 printf("fdt_root: %s\n", fdt_strerror(err));
200 serial = getenv("serial#");
202 err = fdt_setprop(fdt, 0, "serial-number", serial,
206 printf("WARNING: could not set serial-number %s.\n",
215 int fdt_initrd(void *fdt, ulong initrd_start, ulong initrd_end)
222 /* just return if the size of initrd is zero */
223 if (initrd_start == initrd_end)
226 /* find or create "/chosen" node. */
227 nodeoffset = fdt_find_or_add_subnode(fdt, 0, "chosen");
231 total = fdt_num_mem_rsv(fdt);
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.
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);
245 err = fdt_add_mem_rsv(fdt, initrd_start, initrd_end - initrd_start);
247 printf("fdt_initrd: %s\n", fdt_strerror(err));
251 is_u64 = (fdt_address_cells(fdt, 0) == 2);
253 err = fdt_setprop_uxx(fdt, nodeoffset, "linux,initrd-start",
254 (uint64_t)initrd_start, is_u64);
257 printf("WARNING: could not set linux,initrd-start %s.\n",
262 err = fdt_setprop_uxx(fdt, nodeoffset, "linux,initrd-end",
263 (uint64_t)initrd_end, is_u64);
266 printf("WARNING: could not set linux,initrd-end %s.\n",
275 int fdt_chosen(void *fdt)
279 char *str; /* used to set string properties */
281 err = fdt_check_header(fdt);
283 printf("fdt_chosen: %s\n", fdt_strerror(err));
287 /* find or create "/chosen" node. */
288 nodeoffset = fdt_find_or_add_subnode(fdt, 0, "chosen");
292 str = getenv("bootargs");
294 err = fdt_setprop(fdt, nodeoffset, "bootargs", str,
297 printf("WARNING: could not set bootargs %s.\n",
303 return fdt_fixup_stdout(fdt, nodeoffset);
306 void do_fixup_by_path(void *fdt, const char *path, const char *prop,
307 const void *val, int len, int create)
311 debug("Updating property '%s/%s' = ", path, prop);
312 for (i = 0; i < len; i++)
313 debug(" %.2x", *(u8*)(val+i));
316 int rc = fdt_find_and_setprop(fdt, path, prop, val, len, create);
318 printf("Unable to update property %s:%s, err=%s\n",
319 path, prop, fdt_strerror(rc));
322 void do_fixup_by_path_u32(void *fdt, const char *path, const char *prop,
325 fdt32_t tmp = cpu_to_fdt32(val);
326 do_fixup_by_path(fdt, path, prop, &tmp, sizeof(tmp), create);
329 void do_fixup_by_prop(void *fdt,
330 const char *pname, const void *pval, int plen,
331 const char *prop, const void *val, int len,
337 debug("Updating property '%s' = ", prop);
338 for (i = 0; i < len; i++)
339 debug(" %.2x", *(u8*)(val+i));
342 off = fdt_node_offset_by_prop_value(fdt, -1, pname, pval, plen);
343 while (off != -FDT_ERR_NOTFOUND) {
344 if (create || (fdt_get_property(fdt, off, prop, NULL) != NULL))
345 fdt_setprop(fdt, off, prop, val, len);
346 off = fdt_node_offset_by_prop_value(fdt, off, pname, pval, plen);
350 void do_fixup_by_prop_u32(void *fdt,
351 const char *pname, const void *pval, int plen,
352 const char *prop, u32 val, int create)
354 fdt32_t tmp = cpu_to_fdt32(val);
355 do_fixup_by_prop(fdt, pname, pval, plen, prop, &tmp, 4, create);
358 void do_fixup_by_compat(void *fdt, const char *compat,
359 const char *prop, const void *val, int len, int create)
364 debug("Updating property '%s' = ", prop);
365 for (i = 0; i < len; i++)
366 debug(" %.2x", *(u8*)(val+i));
369 off = fdt_node_offset_by_compatible(fdt, -1, compat);
370 while (off != -FDT_ERR_NOTFOUND) {
371 if (create || (fdt_get_property(fdt, off, prop, NULL) != NULL))
372 fdt_setprop(fdt, off, prop, val, len);
373 off = fdt_node_offset_by_compatible(fdt, off, compat);
377 void do_fixup_by_compat_u32(void *fdt, const char *compat,
378 const char *prop, u32 val, int create)
380 fdt32_t tmp = cpu_to_fdt32(val);
381 do_fixup_by_compat(fdt, compat, prop, &tmp, 4, create);
385 * fdt_pack_reg - pack address and size array into the "reg"-suitable stream
387 static int fdt_pack_reg(const void *fdt, void *buf, u64 *address, u64 *size,
391 int address_cells = fdt_address_cells(fdt, 0);
392 int size_cells = fdt_size_cells(fdt, 0);
395 for (i = 0; i < n; i++) {
396 if (address_cells == 2)
397 *(fdt64_t *)p = cpu_to_fdt64(address[i]);
399 *(fdt32_t *)p = cpu_to_fdt32(address[i]);
400 p += 4 * address_cells;
403 *(fdt64_t *)p = cpu_to_fdt64(size[i]);
405 *(fdt32_t *)p = cpu_to_fdt32(size[i]);
409 return p - (char *)buf;
412 #ifdef CONFIG_NR_DRAM_BANKS
413 #define MEMORY_BANKS_MAX CONFIG_NR_DRAM_BANKS
415 #define MEMORY_BANKS_MAX 4
417 int fdt_fixup_memory_banks(void *blob, u64 start[], u64 size[], int banks)
421 u8 tmp[MEMORY_BANKS_MAX * 16]; /* Up to 64-bit address + 64-bit size */
423 if (banks > MEMORY_BANKS_MAX) {
424 printf("%s: num banks %d exceeds hardcoded limit %d."
425 " Recompile with higher MEMORY_BANKS_MAX?\n",
426 __FUNCTION__, banks, MEMORY_BANKS_MAX);
430 err = fdt_check_header(blob);
432 printf("%s: %s\n", __FUNCTION__, fdt_strerror(err));
436 /* find or create "/memory" node. */
437 nodeoffset = fdt_find_or_add_subnode(blob, 0, "memory");
441 err = fdt_setprop(blob, nodeoffset, "device_type", "memory",
444 printf("WARNING: could not set %s %s.\n", "device_type",
452 len = fdt_pack_reg(blob, tmp, start, size, banks);
454 err = fdt_setprop(blob, nodeoffset, "reg", tmp, len);
456 printf("WARNING: could not set %s %s.\n",
457 "reg", fdt_strerror(err));
463 int fdt_fixup_memory(void *blob, u64 start, u64 size)
465 return fdt_fixup_memory_banks(blob, &start, &size, 1);
468 void fdt_fixup_ethernet(void *fdt)
474 unsigned char mac_addr[6];
477 if (fdt_path_offset(fdt, "/aliases") < 0)
480 /* Cycle through all aliases */
481 for (prop = 0; ; prop++) {
483 int len = strlen("ethernet");
485 /* FDT might have been edited, recompute the offset */
486 offset = fdt_first_property_offset(fdt,
487 fdt_path_offset(fdt, "/aliases"));
488 /* Select property number 'prop' */
489 for (i = 0; i < prop; i++)
490 offset = fdt_next_property_offset(fdt, offset);
495 path = fdt_getprop_by_offset(fdt, offset, &name, NULL);
496 if (!strncmp(name, "ethernet", len)) {
497 i = trailing_strtol(name);
500 strcpy(mac, "ethaddr");
502 sprintf(mac, "eth%daddr", i);
510 for (j = 0; j < 6; j++) {
512 simple_strtoul(tmp, &end, 16) : 0;
514 tmp = (*end) ? end + 1 : end;
517 do_fixup_by_path(fdt, path, "mac-address",
519 do_fixup_by_path(fdt, path, "local-mac-address",
525 /* Resize the fdt to its actual size + a bit of padding */
526 int fdt_shrink_to_minimum(void *blob)
536 total = fdt_num_mem_rsv(blob);
537 for (i = 0; i < total; i++) {
538 fdt_get_mem_rsv(blob, i, &addr, &size);
539 if (addr == (uintptr_t)blob) {
540 fdt_del_mem_rsv(blob, i);
546 * Calculate the actual size of the fdt
547 * plus the size needed for 5 fdt_add_mem_rsv, one
548 * for the fdt itself and 4 for a possible initrd
549 * ((initrd-start + initrd-end) * 2 (name & value))
551 actualsize = fdt_off_dt_strings(blob) +
552 fdt_size_dt_strings(blob) + 5 * sizeof(struct fdt_reserve_entry);
554 /* Make it so the fdt ends on a page boundary */
555 actualsize = ALIGN(actualsize + ((uintptr_t)blob & 0xfff), 0x1000);
556 actualsize = actualsize - ((uintptr_t)blob & 0xfff);
558 /* Change the fdt header to reflect the correct size */
559 fdt_set_totalsize(blob, actualsize);
561 /* Add the new reservation */
562 ret = fdt_add_mem_rsv(blob, (uintptr_t)blob, actualsize);
570 #define CONFIG_SYS_PCI_NR_INBOUND_WIN 4
572 #define FDT_PCI_PREFETCH (0x40000000)
573 #define FDT_PCI_MEM32 (0x02000000)
574 #define FDT_PCI_IO (0x01000000)
575 #define FDT_PCI_MEM64 (0x03000000)
577 int fdt_pci_dma_ranges(void *blob, int phb_off, struct pci_controller *hose) {
579 int addrcell, sizecell, len, r;
581 /* sized based on pci addr cells, size-cells, & address-cells */
582 u32 dma_ranges[(3 + 2 + 2) * CONFIG_SYS_PCI_NR_INBOUND_WIN];
584 addrcell = fdt_getprop_u32_default(blob, "/", "#address-cells", 1);
585 sizecell = fdt_getprop_u32_default(blob, "/", "#size-cells", 1);
587 dma_range = &dma_ranges[0];
588 for (r = 0; r < hose->region_count; r++) {
589 u64 bus_start, phys_start, size;
591 /* skip if !PCI_REGION_SYS_MEMORY */
592 if (!(hose->regions[r].flags & PCI_REGION_SYS_MEMORY))
595 bus_start = (u64)hose->regions[r].bus_start;
596 phys_start = (u64)hose->regions[r].phys_start;
597 size = (u64)hose->regions[r].size;
600 if (size >= 0x100000000ull)
601 dma_range[0] |= FDT_PCI_MEM64;
603 dma_range[0] |= FDT_PCI_MEM32;
604 if (hose->regions[r].flags & PCI_REGION_PREFETCH)
605 dma_range[0] |= FDT_PCI_PREFETCH;
606 #ifdef CONFIG_SYS_PCI_64BIT
607 dma_range[1] = bus_start >> 32;
611 dma_range[2] = bus_start & 0xffffffff;
614 dma_range[3] = phys_start >> 32;
615 dma_range[4] = phys_start & 0xffffffff;
617 dma_range[3] = phys_start & 0xffffffff;
621 dma_range[3 + addrcell + 0] = size >> 32;
622 dma_range[3 + addrcell + 1] = size & 0xffffffff;
624 dma_range[3 + addrcell + 0] = size & 0xffffffff;
627 dma_range += (3 + addrcell + sizecell);
630 len = dma_range - &dma_ranges[0];
632 fdt_setprop(blob, phb_off, "dma-ranges", &dma_ranges[0], len*4);
638 #ifdef CONFIG_FDT_FIXUP_NOR_FLASH_SIZE
640 * Provide a weak default function to return the flash bank size.
641 * There might be multiple non-identical flash chips connected to one
642 * chip-select, so we need to pass an index as well.
644 u32 __flash_get_bank_size(int cs, int idx)
646 extern flash_info_t flash_info[];
649 * As default, a simple 1:1 mapping is provided. Boards with
650 * a different mapping need to supply a board specific mapping
653 return flash_info[cs].size;
655 u32 flash_get_bank_size(int cs, int idx)
656 __attribute__((weak, alias("__flash_get_bank_size")));
659 * This function can be used to update the size in the "reg" property
660 * of all NOR FLASH device nodes. This is necessary for boards with
661 * non-fixed NOR FLASH sizes.
663 int fdt_fixup_nor_flash_size(void *blob)
665 char compat[][16] = { "cfi-flash", "jedec-flash" };
668 struct fdt_property *prop;
672 for (i = 0; i < 2; i++) {
673 off = fdt_node_offset_by_compatible(blob, -1, compat[i]);
674 while (off != -FDT_ERR_NOTFOUND) {
678 * Found one compatible node, so fixup the size
679 * int its reg properties
681 prop = fdt_get_property_w(blob, off, "reg", &len);
683 int tuple_size = 3 * sizeof(reg);
686 * There might be multiple reg-tuples,
687 * so loop through them all
689 reg = reg2 = (u32 *)&prop->data[0];
690 for (idx = 0; idx < (len / tuple_size); idx++) {
692 * Update size in reg property
694 reg[2] = flash_get_bank_size(reg[0],
698 * Point to next reg tuple
703 fdt_setprop(blob, off, "reg", reg2, len);
706 /* Move to next compatible node */
707 off = fdt_node_offset_by_compatible(blob, off,
716 int fdt_increase_size(void *fdt, int add_len)
720 newlen = fdt_totalsize(fdt) + add_len;
722 /* Open in place with a new len */
723 return fdt_open_into(fdt, fdt, newlen);
726 #ifdef CONFIG_FDT_FIXUP_PARTITIONS
727 #include <jffs2/load_kernel.h>
728 #include <mtd_node.h>
735 int fdt_del_subnodes(const void *blob, int parent_offset)
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)) {
744 debug("delete %s: offset: %x\n",
745 fdt_get_name(blob, off, 0), off);
746 ret = fdt_del_node((void *)blob, off);
748 printf("Can't delete node: %s\n",
760 int fdt_del_partitions(void *blob, int parent_offset)
767 off = fdt_next_node(blob, parent_offset, &ndepth);
768 if (off > 0 && ndepth == 1) {
769 prop = fdt_getprop(blob, off, "label", NULL);
772 * Could not find label property, nand {}; node?
773 * Check subnode, delete partitions there if any.
775 return fdt_del_partitions(blob, off);
777 ret = fdt_del_subnodes(blob, parent_offset);
779 printf("Can't remove subnodes: %s\n",
788 int fdt_node_set_part_info(void *blob, int parent_offset,
789 struct mtd_device *dev)
791 struct list_head *pentry;
792 struct part_info *part;
793 struct reg_cell cell;
798 ret = fdt_del_partitions(blob, parent_offset);
803 * Check if it is nand {}; subnode, adjust
804 * the offset in this case
806 off = fdt_next_node(blob, parent_offset, &ndepth);
807 if (off > 0 && ndepth == 1)
811 list_for_each_prev(pentry, &dev->parts) {
814 part = list_entry(pentry, struct part_info, link);
816 debug("%2d: %-20s0x%08llx\t0x%08llx\t%d\n",
817 part_num, part->name, part->size,
818 part->offset, part->mask_flags);
820 sprintf(buf, "partition@%llx", part->offset);
822 ret = fdt_add_subnode(blob, parent_offset, buf);
823 if (ret == -FDT_ERR_NOSPACE) {
824 ret = fdt_increase_size(blob, 512);
829 } else if (ret < 0) {
830 printf("Can't add partition node: %s\n",
836 /* Check MTD_WRITEABLE_CMD flag */
837 if (part->mask_flags & 1) {
839 ret = fdt_setprop(blob, newoff, "read_only", NULL, 0);
840 if (ret == -FDT_ERR_NOSPACE) {
841 ret = fdt_increase_size(blob, 512);
850 cell.r0 = cpu_to_fdt32(part->offset);
851 cell.r1 = cpu_to_fdt32(part->size);
853 ret = fdt_setprop(blob, newoff, "reg", &cell, sizeof(cell));
854 if (ret == -FDT_ERR_NOSPACE) {
855 ret = fdt_increase_size(blob, 512);
864 ret = fdt_setprop_string(blob, newoff, "label", part->name);
865 if (ret == -FDT_ERR_NOSPACE) {
866 ret = fdt_increase_size(blob, 512);
878 printf("Can't increase blob size: %s\n", fdt_strerror(ret));
881 printf("Can't add property: %s\n", fdt_strerror(ret));
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:
892 * struct node_info nodes[] = {
893 * { "fsl,mpc5121-nfc", MTD_DEV_TYPE_NAND, },
894 * { "cfi-flash", MTD_DEV_TYPE_NOR, },
897 * fdt_fixup_mtdparts(blob, nodes, ARRAY_SIZE(nodes));
899 void fdt_fixup_mtdparts(void *blob, void *node_info, int node_info_size)
901 struct node_info *ni = node_info;
902 struct mtd_device *dev;
907 parts = getenv("mtdparts");
911 if (mtdparts_init() != 0)
914 for (i = 0; i < node_info_size; i++) {
916 noff = fdt_node_offset_by_compatible(blob, -1, ni[i].compat);
917 while (noff != -FDT_ERR_NOTFOUND) {
918 debug("%s: %s, mtd dev type %d\n",
919 fdt_get_name(blob, noff, 0),
920 ni[i].compat, ni[i].type);
921 dev = device_find(ni[i].type, idx++);
923 if (fdt_node_set_part_info(blob, noff, dev))
924 return; /* return on error */
927 /* Jump to next flash node */
928 noff = fdt_node_offset_by_compatible(blob, noff,
935 void fdt_del_node_and_alias(void *blob, const char *alias)
937 int off = fdt_path_offset(blob, alias);
942 fdt_del_node(blob, off);
944 off = fdt_path_offset(blob, "/aliases");
945 fdt_delprop(blob, off, alias);
948 /* Max address size we deal with */
949 #define OF_MAX_ADDR_CELLS 4
950 #define OF_BAD_ADDR FDT_ADDR_T_NONE
951 #define OF_CHECK_COUNTS(na, ns) ((na) > 0 && (na) <= OF_MAX_ADDR_CELLS && \
956 static void of_dump_addr(const char *s, const fdt32_t *addr, int na)
960 printf(" %08x", *(addr++));
964 static void of_dump_addr(const char *s, const fdt32_t *addr, int na) { }
968 * struct of_bus - Callbacks for bus specific translators
969 * @name: A string used to identify this bus in debug output.
970 * @addresses: The name of the DT property from which addresses are
971 * to be read, typically "reg".
972 * @match: Return non-zero if the node whose parent is at
973 * parentoffset in the FDT blob corresponds to a bus
974 * of this type, otherwise return zero. If NULL a match
976 * @count_cells:Count how many cells (be32 values) a node whose parent
977 * is at parentoffset in the FDT blob will require to
978 * represent its address (written to *addrc) & size
979 * (written to *sizec).
980 * @map: Map the address addr from the address space of this
981 * bus to that of its parent, making use of the ranges
982 * read from DT to an array at range. na and ns are the
983 * number of cells (be32 values) used to hold and address
984 * or size, respectively, for this bus. pna is the number
985 * of cells used to hold an address for the parent bus.
986 * Returns the address in the address space of the parent
988 * @translate: Update the value of the address cells at addr within an
989 * FDT by adding offset to it. na specifies the number of
990 * cells used to hold the address being translated. Returns
991 * zero on success, non-zero on error.
993 * Each bus type will include a struct of_bus in the of_busses array,
994 * providing implementations of some or all of the functions used to
995 * match the bus & handle address translation for its children.
999 const char *addresses;
1000 int (*match)(void *blob, int parentoffset);
1001 void (*count_cells)(void *blob, int parentoffset,
1002 int *addrc, int *sizec);
1003 u64 (*map)(fdt32_t *addr, const fdt32_t *range,
1004 int na, int ns, int pna);
1005 int (*translate)(fdt32_t *addr, u64 offset, int na);
1008 /* Default translator (generic bus) */
1009 void of_bus_default_count_cells(void *blob, int parentoffset,
1010 int *addrc, int *sizec)
1012 const fdt32_t *prop;
1015 *addrc = fdt_address_cells(blob, parentoffset);
1018 prop = fdt_getprop(blob, parentoffset, "#size-cells", NULL);
1020 *sizec = be32_to_cpup(prop);
1026 static u64 of_bus_default_map(fdt32_t *addr, const fdt32_t *range,
1027 int na, int ns, int pna)
1031 cp = of_read_number(range, na);
1032 s = of_read_number(range + na + pna, ns);
1033 da = of_read_number(addr, na);
1035 debug("OF: default map, cp=%" PRIu64 ", s=%" PRIu64
1036 ", da=%" PRIu64 "\n", cp, s, da);
1038 if (da < cp || da >= (cp + s))
1043 static int of_bus_default_translate(fdt32_t *addr, u64 offset, int na)
1045 u64 a = of_read_number(addr, na);
1046 memset(addr, 0, na * 4);
1049 addr[na - 2] = cpu_to_fdt32(a >> 32);
1050 addr[na - 1] = cpu_to_fdt32(a & 0xffffffffu);
1055 #ifdef CONFIG_OF_ISA_BUS
1057 /* ISA bus translator */
1058 static int of_bus_isa_match(void *blob, int parentoffset)
1062 name = fdt_get_name(blob, parentoffset, NULL);
1066 return !strcmp(name, "isa");
1069 static void of_bus_isa_count_cells(void *blob, int parentoffset,
1070 int *addrc, int *sizec)
1078 static u64 of_bus_isa_map(fdt32_t *addr, const fdt32_t *range,
1079 int na, int ns, int pna)
1083 /* Check address type match */
1084 if ((addr[0] ^ range[0]) & cpu_to_be32(1))
1087 cp = of_read_number(range + 1, na - 1);
1088 s = of_read_number(range + na + pna, ns);
1089 da = of_read_number(addr + 1, na - 1);
1091 debug("OF: ISA map, cp=%" PRIu64 ", s=%" PRIu64
1092 ", da=%" PRIu64 "\n", cp, s, da);
1094 if (da < cp || da >= (cp + s))
1099 static int of_bus_isa_translate(fdt32_t *addr, u64 offset, int na)
1101 return of_bus_default_translate(addr + 1, offset, na - 1);
1104 #endif /* CONFIG_OF_ISA_BUS */
1106 /* Array of bus specific translators */
1107 static struct of_bus of_busses[] = {
1108 #ifdef CONFIG_OF_ISA_BUS
1113 .match = of_bus_isa_match,
1114 .count_cells = of_bus_isa_count_cells,
1115 .map = of_bus_isa_map,
1116 .translate = of_bus_isa_translate,
1118 #endif /* CONFIG_OF_ISA_BUS */
1123 .count_cells = of_bus_default_count_cells,
1124 .map = of_bus_default_map,
1125 .translate = of_bus_default_translate,
1129 static struct of_bus *of_match_bus(void *blob, int parentoffset)
1133 if (ARRAY_SIZE(of_busses) == 1)
1136 for (bus = of_busses; bus; bus++) {
1137 if (!bus->match || bus->match(blob, parentoffset))
1142 * We should always have matched the default bus at least, since
1143 * it has a NULL match field. If we didn't then it somehow isn't
1144 * in the of_busses array or something equally catastrophic has
1151 static int of_translate_one(void * blob, int parent, struct of_bus *bus,
1152 struct of_bus *pbus, fdt32_t *addr,
1153 int na, int ns, int pna, const char *rprop)
1155 const fdt32_t *ranges;
1158 u64 offset = OF_BAD_ADDR;
1160 /* Normally, an absence of a "ranges" property means we are
1161 * crossing a non-translatable boundary, and thus the addresses
1162 * below the current not cannot be converted to CPU physical ones.
1163 * Unfortunately, while this is very clear in the spec, it's not
1164 * what Apple understood, and they do have things like /uni-n or
1165 * /ht nodes with no "ranges" property and a lot of perfectly
1166 * useable mapped devices below them. Thus we treat the absence of
1167 * "ranges" as equivalent to an empty "ranges" property which means
1168 * a 1:1 translation at that level. It's up to the caller not to try
1169 * to translate addresses that aren't supposed to be translated in
1170 * the first place. --BenH.
1172 ranges = fdt_getprop(blob, parent, rprop, &rlen);
1173 if (ranges == NULL || rlen == 0) {
1174 offset = of_read_number(addr, na);
1175 memset(addr, 0, pna * 4);
1176 debug("OF: no ranges, 1:1 translation\n");
1180 debug("OF: walking ranges...\n");
1182 /* Now walk through the ranges */
1184 rone = na + pna + ns;
1185 for (; rlen >= rone; rlen -= rone, ranges += rone) {
1186 offset = bus->map(addr, ranges, na, ns, pna);
1187 if (offset != OF_BAD_ADDR)
1190 if (offset == OF_BAD_ADDR) {
1191 debug("OF: not found !\n");
1194 memcpy(addr, ranges + na, 4 * pna);
1197 of_dump_addr("OF: parent translation for:", addr, pna);
1198 debug("OF: with offset: %" PRIu64 "\n", offset);
1200 /* Translate it into parent bus space */
1201 return pbus->translate(addr, offset, pna);
1205 * Translate an address from the device-tree into a CPU physical address,
1206 * this walks up the tree and applies the various bus mappings on the
1209 * Note: We consider that crossing any level with #size-cells == 0 to mean
1210 * that translation is impossible (that is we are not dealing with a value
1211 * that can be mapped to a cpu physical address). This is not really specified
1212 * that way, but this is traditionally the way IBM at least do things
1214 static u64 __of_translate_address(void *blob, int node_offset, const fdt32_t *in_addr,
1218 struct of_bus *bus, *pbus;
1219 fdt32_t addr[OF_MAX_ADDR_CELLS];
1220 int na, ns, pna, pns;
1221 u64 result = OF_BAD_ADDR;
1223 debug("OF: ** translation for device %s **\n",
1224 fdt_get_name(blob, node_offset, NULL));
1226 /* Get parent & match bus type */
1227 parent = fdt_parent_offset(blob, node_offset);
1230 bus = of_match_bus(blob, parent);
1232 /* Cound address cells & copy address locally */
1233 bus->count_cells(blob, parent, &na, &ns);
1234 if (!OF_CHECK_COUNTS(na, ns)) {
1235 printf("%s: Bad cell count for %s\n", __FUNCTION__,
1236 fdt_get_name(blob, node_offset, NULL));
1239 memcpy(addr, in_addr, na * 4);
1241 debug("OF: bus is %s (na=%d, ns=%d) on %s\n",
1242 bus->name, na, ns, fdt_get_name(blob, parent, NULL));
1243 of_dump_addr("OF: translating address:", addr, na);
1247 /* Switch to parent bus */
1248 node_offset = parent;
1249 parent = fdt_parent_offset(blob, node_offset);
1251 /* If root, we have finished */
1253 debug("OF: reached root node\n");
1254 result = of_read_number(addr, na);
1258 /* Get new parent bus and counts */
1259 pbus = of_match_bus(blob, parent);
1260 pbus->count_cells(blob, parent, &pna, &pns);
1261 if (!OF_CHECK_COUNTS(pna, pns)) {
1262 printf("%s: Bad cell count for %s\n", __FUNCTION__,
1263 fdt_get_name(blob, node_offset, NULL));
1267 debug("OF: parent bus is %s (na=%d, ns=%d) on %s\n",
1268 pbus->name, pna, pns, fdt_get_name(blob, parent, NULL));
1270 /* Apply bus translation */
1271 if (of_translate_one(blob, node_offset, bus, pbus,
1272 addr, na, ns, pna, rprop))
1275 /* Complete the move up one level */
1280 of_dump_addr("OF: one level translation:", addr, na);
1287 u64 fdt_translate_address(void *blob, int node_offset, const fdt32_t *in_addr)
1289 return __of_translate_address(blob, node_offset, in_addr, "ranges");
1293 * fdt_node_offset_by_compat_reg: Find a node that matches compatiable and
1294 * who's reg property matches a physical cpu address
1296 * @blob: ptr to device tree
1297 * @compat: compatiable string to match
1298 * @compat_off: property name
1301 int fdt_node_offset_by_compat_reg(void *blob, const char *compat,
1302 phys_addr_t compat_off)
1304 int len, off = fdt_node_offset_by_compatible(blob, -1, compat);
1305 while (off != -FDT_ERR_NOTFOUND) {
1306 const fdt32_t *reg = fdt_getprop(blob, off, "reg", &len);
1308 if (compat_off == fdt_translate_address(blob, off, reg))
1311 off = fdt_node_offset_by_compatible(blob, off, compat);
1314 return -FDT_ERR_NOTFOUND;
1318 * fdt_alloc_phandle: Return next free phandle value
1320 * @blob: ptr to device tree
1322 int fdt_alloc_phandle(void *blob)
1325 uint32_t phandle = 0;
1327 for (offset = fdt_next_node(blob, -1, NULL); offset >= 0;
1328 offset = fdt_next_node(blob, offset, NULL)) {
1329 phandle = max(phandle, fdt_get_phandle(blob, offset));
1336 * fdt_set_phandle: Create a phandle property for the given node
1338 * @fdt: ptr to device tree
1339 * @nodeoffset: node to update
1340 * @phandle: phandle value to set (must be unique)
1342 int fdt_set_phandle(void *fdt, int nodeoffset, uint32_t phandle)
1347 int off = fdt_node_offset_by_phandle(fdt, phandle);
1349 if ((off >= 0) && (off != nodeoffset)) {
1352 fdt_get_path(fdt, nodeoffset, buf, sizeof(buf));
1353 printf("Trying to update node %s with phandle %u ",
1356 fdt_get_path(fdt, off, buf, sizeof(buf));
1357 printf("that already exists in node %s.\n", buf);
1358 return -FDT_ERR_BADPHANDLE;
1362 ret = fdt_setprop_cell(fdt, nodeoffset, "phandle", phandle);
1367 * For now, also set the deprecated "linux,phandle" property, so that we
1368 * don't break older kernels.
1370 ret = fdt_setprop_cell(fdt, nodeoffset, "linux,phandle", phandle);
1376 * fdt_create_phandle: Create a phandle property for the given node
1378 * @fdt: ptr to device tree
1379 * @nodeoffset: node to update
1381 unsigned int fdt_create_phandle(void *fdt, int nodeoffset)
1383 /* see if there is a phandle already */
1384 int phandle = fdt_get_phandle(fdt, nodeoffset);
1386 /* if we got 0, means no phandle so create one */
1390 phandle = fdt_alloc_phandle(fdt);
1391 ret = fdt_set_phandle(fdt, nodeoffset, phandle);
1393 printf("Can't set phandle %u: %s\n", phandle,
1403 * fdt_set_node_status: Set status for the given node
1405 * @fdt: ptr to device tree
1406 * @nodeoffset: node to update
1407 * @status: FDT_STATUS_OKAY, FDT_STATUS_DISABLED,
1408 * FDT_STATUS_FAIL, FDT_STATUS_FAIL_ERROR_CODE
1409 * @error_code: optional, only used if status is FDT_STATUS_FAIL_ERROR_CODE
1411 int fdt_set_node_status(void *fdt, int nodeoffset,
1412 enum fdt_status status, unsigned int error_code)
1421 case FDT_STATUS_OKAY:
1422 ret = fdt_setprop_string(fdt, nodeoffset, "status", "okay");
1424 case FDT_STATUS_DISABLED:
1425 ret = fdt_setprop_string(fdt, nodeoffset, "status", "disabled");
1427 case FDT_STATUS_FAIL:
1428 ret = fdt_setprop_string(fdt, nodeoffset, "status", "fail");
1430 case FDT_STATUS_FAIL_ERROR_CODE:
1431 sprintf(buf, "fail-%d", error_code);
1432 ret = fdt_setprop_string(fdt, nodeoffset, "status", buf);
1435 printf("Invalid fdt status: %x\n", status);
1444 * fdt_set_status_by_alias: Set status for the given node given an alias
1446 * @fdt: ptr to device tree
1447 * @alias: alias of node to update
1448 * @status: FDT_STATUS_OKAY, FDT_STATUS_DISABLED,
1449 * FDT_STATUS_FAIL, FDT_STATUS_FAIL_ERROR_CODE
1450 * @error_code: optional, only used if status is FDT_STATUS_FAIL_ERROR_CODE
1452 int fdt_set_status_by_alias(void *fdt, const char* alias,
1453 enum fdt_status status, unsigned int error_code)
1455 int offset = fdt_path_offset(fdt, alias);
1457 return fdt_set_node_status(fdt, offset, status, error_code);
1460 #if defined(CONFIG_VIDEO) || defined(CONFIG_LCD)
1461 int fdt_add_edid(void *blob, const char *compat, unsigned char *edid_buf)
1466 noff = fdt_node_offset_by_compatible(blob, -1, compat);
1467 if (noff != -FDT_ERR_NOTFOUND) {
1468 debug("%s: %s\n", fdt_get_name(blob, noff, 0), compat);
1470 ret = fdt_setprop(blob, noff, "edid", edid_buf, 128);
1471 if (ret == -FDT_ERR_NOSPACE) {
1472 ret = fdt_increase_size(blob, 512);
1477 } else if (ret < 0) {
1478 printf("Can't add property: %s\n", fdt_strerror(ret));
1484 printf("Can't increase blob size: %s\n", fdt_strerror(ret));
1490 * Verify the physical address of device tree node for a given alias
1492 * This function locates the device tree node of a given alias, and then
1493 * verifies that the physical address of that device matches the given
1494 * parameter. It displays a message if there is a mismatch.
1496 * Returns 1 on success, 0 on failure
1498 int fdt_verify_alias_address(void *fdt, int anode, const char *alias, u64 addr)
1505 path = fdt_getprop(fdt, anode, alias, NULL);
1507 /* If there's no such alias, then it's not a failure */
1511 node = fdt_path_offset(fdt, path);
1513 printf("Warning: device tree alias '%s' points to invalid "
1514 "node %s.\n", alias, path);
1518 reg = fdt_getprop(fdt, node, "reg", &len);
1520 printf("Warning: device tree node '%s' has no address.\n",
1525 dt_addr = fdt_translate_address(fdt, node, reg);
1526 if (addr != dt_addr) {
1527 printf("Warning: U-Boot configured device %s at address %"
1528 PRIx64 ",\n but the device tree has it address %"
1529 PRIx64 ".\n", alias, addr, dt_addr);
1537 * Returns the base address of an SOC or PCI node
1539 u64 fdt_get_base_address(void *fdt, int node)
1543 const fdt32_t *prop;
1545 naddr = fdt_address_cells(fdt, node);
1547 prop = fdt_getprop(fdt, node, "ranges", &size);
1549 return prop ? fdt_translate_address(fdt, node, prop + naddr) : 0;
1553 * Read a property of size <prop_len>. Currently only supports 1 or 2 cells.
1555 static int fdt_read_prop(const fdt32_t *prop, int prop_len, int cell_off,
1556 uint64_t *val, int cells)
1558 const fdt32_t *prop32 = &prop[cell_off];
1559 const fdt64_t *prop64 = (const fdt64_t *)&prop[cell_off];
1561 if ((cell_off + cells) > prop_len)
1562 return -FDT_ERR_NOSPACE;
1566 *val = fdt32_to_cpu(*prop32);
1569 *val = fdt64_to_cpu(*prop64);
1572 return -FDT_ERR_NOSPACE;
1579 * fdt_read_range - Read a node's n'th range property
1581 * @fdt: ptr to device tree
1582 * @node: offset of node
1584 * @child_addr: pointer to storage for the "child address" field
1585 * @addr: pointer to storage for the CPU view translated physical start
1586 * @len: pointer to storage for the range length
1588 * Convenience function that reads and interprets a specific range out of
1589 * a number of the "ranges" property array.
1591 int fdt_read_range(void *fdt, int node, int n, uint64_t *child_addr,
1592 uint64_t *addr, uint64_t *len)
1594 int pnode = fdt_parent_offset(fdt, node);
1595 const fdt32_t *ranges;
1604 * The "ranges" property is an array of
1605 * { <child address> <parent address> <size in child address space> }
1607 * All 3 elements can span a diffent number of cells. Fetch their size.
1609 pacells = fdt_getprop_u32_default_node(fdt, pnode, 0, "#address-cells", 1);
1610 acells = fdt_getprop_u32_default_node(fdt, node, 0, "#address-cells", 1);
1611 scells = fdt_getprop_u32_default_node(fdt, node, 0, "#size-cells", 1);
1613 /* Now try to get the ranges property */
1614 ranges = fdt_getprop(fdt, node, "ranges", &ranges_len);
1616 return -FDT_ERR_NOTFOUND;
1617 ranges_len /= sizeof(uint32_t);
1619 /* Jump to the n'th entry */
1620 cell = n * (pacells + acells + scells);
1622 /* Read <child address> */
1624 r = fdt_read_prop(ranges, ranges_len, cell, child_addr,
1631 /* Read <parent address> */
1633 *addr = fdt_translate_address(fdt, node, ranges + cell);
1636 /* Read <size in child address space> */
1638 r = fdt_read_prop(ranges, ranges_len, cell, len, scells);
1647 * fdt_setup_simplefb_node - Fill and enable a simplefb node
1649 * @fdt: ptr to device tree
1650 * @node: offset of the simplefb node
1651 * @base_address: framebuffer base address
1652 * @width: width in pixels
1653 * @height: height in pixels
1654 * @stride: bytes per line
1655 * @format: pixel format string
1657 * Convenience function to fill and enable a simplefb node.
1659 int fdt_setup_simplefb_node(void *fdt, int node, u64 base_address, u32 width,
1660 u32 height, u32 stride, const char *format)
1664 int i, addrc, sizec, ret;
1666 of_bus_default_count_cells(fdt, fdt_parent_offset(fdt, node),
1670 cells[i++] = cpu_to_fdt32(base_address >> 32);
1671 cells[i++] = cpu_to_fdt32(base_address);
1674 cells[i++] = cpu_to_fdt32(height * stride);
1676 ret = fdt_setprop(fdt, node, "reg", cells, sizeof(cells[0]) * i);
1680 snprintf(name, sizeof(name), "framebuffer@%" PRIx64, base_address);
1681 ret = fdt_set_name(fdt, node, name);
1685 ret = fdt_setprop_u32(fdt, node, "width", width);
1689 ret = fdt_setprop_u32(fdt, node, "height", height);
1693 ret = fdt_setprop_u32(fdt, node, "stride", stride);
1697 ret = fdt_setprop_string(fdt, node, "format", format);
1701 ret = fdt_setprop_string(fdt, node, "status", "okay");
1709 * Update native-mode in display-timings from display environment variable.
1710 * The node to update are specified by path.
1712 int fdt_fixup_display(void *blob, const char *path, const char *display)
1716 if (!display || !path)
1717 return -FDT_ERR_NOTFOUND;
1719 toff = fdt_path_offset(blob, path);
1721 toff = fdt_subnode_offset(blob, toff, "display-timings");
1725 for (off = fdt_first_subnode(blob, toff);
1727 off = fdt_next_subnode(blob, off)) {
1728 uint32_t h = fdt_get_phandle(blob, off);
1729 debug("%s:0x%x\n", fdt_get_name(blob, off, NULL),
1731 if (strcasecmp(fdt_get_name(blob, off, NULL), display) == 0)
1732 return fdt_setprop_u32(blob, toff, "native-mode", h);