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);
384 #ifdef CONFIG_ARCH_FIXUP_FDT_MEMORY
386 * fdt_pack_reg - pack address and size array into the "reg"-suitable stream
388 static int fdt_pack_reg(const void *fdt, void *buf, u64 *address, u64 *size,
392 int address_cells = fdt_address_cells(fdt, 0);
393 int size_cells = fdt_size_cells(fdt, 0);
396 for (i = 0; i < n; i++) {
397 if (address_cells == 2)
398 *(fdt64_t *)p = cpu_to_fdt64(address[i]);
400 *(fdt32_t *)p = cpu_to_fdt32(address[i]);
401 p += 4 * address_cells;
404 *(fdt64_t *)p = cpu_to_fdt64(size[i]);
406 *(fdt32_t *)p = cpu_to_fdt32(size[i]);
410 return p - (char *)buf;
413 #ifdef CONFIG_NR_DRAM_BANKS
414 #define MEMORY_BANKS_MAX CONFIG_NR_DRAM_BANKS
416 #define MEMORY_BANKS_MAX 4
418 int fdt_fixup_memory_banks(void *blob, u64 start[], u64 size[], int banks)
422 u8 tmp[MEMORY_BANKS_MAX * 16]; /* Up to 64-bit address + 64-bit size */
424 if (banks > MEMORY_BANKS_MAX) {
425 printf("%s: num banks %d exceeds hardcoded limit %d."
426 " Recompile with higher MEMORY_BANKS_MAX?\n",
427 __FUNCTION__, banks, MEMORY_BANKS_MAX);
431 err = fdt_check_header(blob);
433 printf("%s: %s\n", __FUNCTION__, fdt_strerror(err));
437 /* find or create "/memory" node. */
438 nodeoffset = fdt_find_or_add_subnode(blob, 0, "memory");
442 err = fdt_setprop(blob, nodeoffset, "device_type", "memory",
445 printf("WARNING: could not set %s %s.\n", "device_type",
453 len = fdt_pack_reg(blob, tmp, start, size, banks);
455 err = fdt_setprop(blob, nodeoffset, "reg", tmp, len);
457 printf("WARNING: could not set %s %s.\n",
458 "reg", fdt_strerror(err));
465 int fdt_fixup_memory(void *blob, u64 start, u64 size)
467 return fdt_fixup_memory_banks(blob, &start, &size, 1);
470 void fdt_fixup_ethernet(void *fdt)
476 unsigned char mac_addr[ARP_HLEN];
479 if (fdt_path_offset(fdt, "/aliases") < 0)
482 /* Cycle through all aliases */
483 for (prop = 0; ; prop++) {
485 int len = strlen("ethernet");
487 /* FDT might have been edited, recompute the offset */
488 offset = fdt_first_property_offset(fdt,
489 fdt_path_offset(fdt, "/aliases"));
490 /* Select property number 'prop' */
491 for (i = 0; i < prop; i++)
492 offset = fdt_next_property_offset(fdt, offset);
497 path = fdt_getprop_by_offset(fdt, offset, &name, NULL);
498 if (!strncmp(name, "ethernet", len)) {
499 i = trailing_strtol(name);
502 strcpy(mac, "ethaddr");
504 sprintf(mac, "eth%daddr", i);
512 for (j = 0; j < 6; j++) {
514 simple_strtoul(tmp, &end, 16) : 0;
516 tmp = (*end) ? end + 1 : end;
519 do_fixup_by_path(fdt, path, "mac-address",
521 do_fixup_by_path(fdt, path, "local-mac-address",
527 /* Resize the fdt to its actual size + a bit of padding */
528 int fdt_shrink_to_minimum(void *blob, uint extrasize)
538 total = fdt_num_mem_rsv(blob);
539 for (i = 0; i < total; i++) {
540 fdt_get_mem_rsv(blob, i, &addr, &size);
541 if (addr == (uintptr_t)blob) {
542 fdt_del_mem_rsv(blob, i);
548 * Calculate the actual size of the fdt
549 * plus the size needed for 5 fdt_add_mem_rsv, one
550 * for the fdt itself and 4 for a possible initrd
551 * ((initrd-start + initrd-end) * 2 (name & value))
553 actualsize = fdt_off_dt_strings(blob) +
554 fdt_size_dt_strings(blob) + 5 * sizeof(struct fdt_reserve_entry);
556 actualsize += extrasize;
557 /* Make it so the fdt ends on a page boundary */
558 actualsize = ALIGN(actualsize + ((uintptr_t)blob & 0xfff), 0x1000);
559 actualsize = actualsize - ((uintptr_t)blob & 0xfff);
561 /* Change the fdt header to reflect the correct size */
562 fdt_set_totalsize(blob, actualsize);
564 /* Add the new reservation */
565 ret = fdt_add_mem_rsv(blob, (uintptr_t)blob, actualsize);
573 #define CONFIG_SYS_PCI_NR_INBOUND_WIN 4
575 #define FDT_PCI_PREFETCH (0x40000000)
576 #define FDT_PCI_MEM32 (0x02000000)
577 #define FDT_PCI_IO (0x01000000)
578 #define FDT_PCI_MEM64 (0x03000000)
580 int fdt_pci_dma_ranges(void *blob, int phb_off, struct pci_controller *hose) {
582 int addrcell, sizecell, len, r;
584 /* sized based on pci addr cells, size-cells, & address-cells */
585 u32 dma_ranges[(3 + 2 + 2) * CONFIG_SYS_PCI_NR_INBOUND_WIN];
587 addrcell = fdt_getprop_u32_default(blob, "/", "#address-cells", 1);
588 sizecell = fdt_getprop_u32_default(blob, "/", "#size-cells", 1);
590 dma_range = &dma_ranges[0];
591 for (r = 0; r < hose->region_count; r++) {
592 u64 bus_start, phys_start, size;
594 /* skip if !PCI_REGION_SYS_MEMORY */
595 if (!(hose->regions[r].flags & PCI_REGION_SYS_MEMORY))
598 bus_start = (u64)hose->regions[r].bus_start;
599 phys_start = (u64)hose->regions[r].phys_start;
600 size = (u64)hose->regions[r].size;
603 if (size >= 0x100000000ull)
604 dma_range[0] |= FDT_PCI_MEM64;
606 dma_range[0] |= FDT_PCI_MEM32;
607 if (hose->regions[r].flags & PCI_REGION_PREFETCH)
608 dma_range[0] |= FDT_PCI_PREFETCH;
609 #ifdef CONFIG_SYS_PCI_64BIT
610 dma_range[1] = bus_start >> 32;
614 dma_range[2] = bus_start & 0xffffffff;
617 dma_range[3] = phys_start >> 32;
618 dma_range[4] = phys_start & 0xffffffff;
620 dma_range[3] = phys_start & 0xffffffff;
624 dma_range[3 + addrcell + 0] = size >> 32;
625 dma_range[3 + addrcell + 1] = size & 0xffffffff;
627 dma_range[3 + addrcell + 0] = size & 0xffffffff;
630 dma_range += (3 + addrcell + sizecell);
633 len = dma_range - &dma_ranges[0];
635 fdt_setprop(blob, phb_off, "dma-ranges", &dma_ranges[0], len*4);
641 #ifdef CONFIG_FDT_FIXUP_NOR_FLASH_SIZE
643 * Provide a weak default function to return the flash bank size.
644 * There might be multiple non-identical flash chips connected to one
645 * chip-select, so we need to pass an index as well.
647 u32 __flash_get_bank_size(int cs, int idx)
649 extern flash_info_t flash_info[];
652 * As default, a simple 1:1 mapping is provided. Boards with
653 * a different mapping need to supply a board specific mapping
656 return flash_info[cs].size;
658 u32 flash_get_bank_size(int cs, int idx)
659 __attribute__((weak, alias("__flash_get_bank_size")));
662 * This function can be used to update the size in the "reg" property
663 * of all NOR FLASH device nodes. This is necessary for boards with
664 * non-fixed NOR FLASH sizes.
666 int fdt_fixup_nor_flash_size(void *blob)
668 char compat[][16] = { "cfi-flash", "jedec-flash" };
671 struct fdt_property *prop;
675 for (i = 0; i < 2; i++) {
676 off = fdt_node_offset_by_compatible(blob, -1, compat[i]);
677 while (off != -FDT_ERR_NOTFOUND) {
681 * Found one compatible node, so fixup the size
682 * int its reg properties
684 prop = fdt_get_property_w(blob, off, "reg", &len);
686 int tuple_size = 3 * sizeof(reg);
689 * There might be multiple reg-tuples,
690 * so loop through them all
692 reg = reg2 = (u32 *)&prop->data[0];
693 for (idx = 0; idx < (len / tuple_size); idx++) {
695 * Update size in reg property
697 reg[2] = flash_get_bank_size(reg[0],
701 * Point to next reg tuple
706 fdt_setprop(blob, off, "reg", reg2, len);
709 /* Move to next compatible node */
710 off = fdt_node_offset_by_compatible(blob, off,
719 int fdt_increase_size(void *fdt, int add_len)
723 newlen = fdt_totalsize(fdt) + add_len;
725 /* Open in place with a new len */
726 return fdt_open_into(fdt, fdt, newlen);
729 #ifdef CONFIG_FDT_FIXUP_PARTITIONS
730 #include <jffs2/load_kernel.h>
731 #include <mtd_node.h>
738 int fdt_del_subnodes(const void *blob, int parent_offset)
743 for (ndepth = 0, off = fdt_next_node(blob, parent_offset, &ndepth);
744 (off >= 0) && (ndepth > 0);
745 off = fdt_next_node(blob, off, &ndepth)) {
747 debug("delete %s: offset: %x\n",
748 fdt_get_name(blob, off, 0), off);
749 ret = fdt_del_node((void *)blob, off);
751 printf("Can't delete node: %s\n",
763 int fdt_del_partitions(void *blob, int parent_offset)
770 off = fdt_next_node(blob, parent_offset, &ndepth);
771 if (off > 0 && ndepth == 1) {
772 prop = fdt_getprop(blob, off, "label", NULL);
775 * Could not find label property, nand {}; node?
776 * Check subnode, delete partitions there if any.
778 return fdt_del_partitions(blob, off);
780 ret = fdt_del_subnodes(blob, parent_offset);
782 printf("Can't remove subnodes: %s\n",
791 int fdt_node_set_part_info(void *blob, int parent_offset,
792 struct mtd_device *dev)
794 struct list_head *pentry;
795 struct part_info *part;
796 struct reg_cell cell;
801 ret = fdt_del_partitions(blob, parent_offset);
806 * Check if it is nand {}; subnode, adjust
807 * the offset in this case
809 off = fdt_next_node(blob, parent_offset, &ndepth);
810 if (off > 0 && ndepth == 1)
814 list_for_each_prev(pentry, &dev->parts) {
817 part = list_entry(pentry, struct part_info, link);
819 debug("%2d: %-20s0x%08llx\t0x%08llx\t%d\n",
820 part_num, part->name, part->size,
821 part->offset, part->mask_flags);
823 sprintf(buf, "partition@%llx", part->offset);
825 ret = fdt_add_subnode(blob, parent_offset, buf);
826 if (ret == -FDT_ERR_NOSPACE) {
827 ret = fdt_increase_size(blob, 512);
832 } else if (ret < 0) {
833 printf("Can't add partition node: %s\n",
839 /* Check MTD_WRITEABLE_CMD flag */
840 if (part->mask_flags & 1) {
842 ret = fdt_setprop(blob, newoff, "read_only", NULL, 0);
843 if (ret == -FDT_ERR_NOSPACE) {
844 ret = fdt_increase_size(blob, 512);
853 cell.r0 = cpu_to_fdt32(part->offset);
854 cell.r1 = cpu_to_fdt32(part->size);
856 ret = fdt_setprop(blob, newoff, "reg", &cell, sizeof(cell));
857 if (ret == -FDT_ERR_NOSPACE) {
858 ret = fdt_increase_size(blob, 512);
867 ret = fdt_setprop_string(blob, newoff, "label", part->name);
868 if (ret == -FDT_ERR_NOSPACE) {
869 ret = fdt_increase_size(blob, 512);
881 printf("Can't increase blob size: %s\n", fdt_strerror(ret));
884 printf("Can't add property: %s\n", fdt_strerror(ret));
889 * Update partitions in nor/nand nodes using info from
890 * mtdparts environment variable. The nodes to update are
891 * specified by node_info structure which contains mtd device
892 * type and compatible string: E. g. the board code in
893 * ft_board_setup() could use:
895 * struct node_info nodes[] = {
896 * { "fsl,mpc5121-nfc", MTD_DEV_TYPE_NAND, },
897 * { "cfi-flash", MTD_DEV_TYPE_NOR, },
900 * fdt_fixup_mtdparts(blob, nodes, ARRAY_SIZE(nodes));
902 void fdt_fixup_mtdparts(void *blob, void *node_info, int node_info_size)
904 struct node_info *ni = node_info;
905 struct mtd_device *dev;
909 if (mtdparts_init() != 0)
912 for (i = 0; i < node_info_size; i++) {
914 noff = fdt_node_offset_by_compatible(blob, -1, ni[i].compat);
915 while (noff != -FDT_ERR_NOTFOUND) {
916 debug("%s: %s, mtd dev type %d\n",
917 fdt_get_name(blob, noff, 0),
918 ni[i].compat, ni[i].type);
919 dev = device_find(ni[i].type, idx++);
921 if (fdt_node_set_part_info(blob, noff, dev))
922 return; /* return on error */
925 /* Jump to next flash node */
926 noff = fdt_node_offset_by_compatible(blob, noff,
933 void fdt_del_node_and_alias(void *blob, const char *alias)
935 int off = fdt_path_offset(blob, alias);
940 fdt_del_node(blob, off);
942 off = fdt_path_offset(blob, "/aliases");
943 fdt_delprop(blob, off, alias);
946 /* Max address size we deal with */
947 #define OF_MAX_ADDR_CELLS 4
948 #define OF_BAD_ADDR FDT_ADDR_T_NONE
949 #define OF_CHECK_COUNTS(na, ns) ((na) > 0 && (na) <= OF_MAX_ADDR_CELLS && \
954 static void of_dump_addr(const char *s, const fdt32_t *addr, int na)
958 printf(" %08x", *(addr++));
962 static void of_dump_addr(const char *s, const fdt32_t *addr, int na) { }
966 * struct of_bus - Callbacks for bus specific translators
967 * @name: A string used to identify this bus in debug output.
968 * @addresses: The name of the DT property from which addresses are
969 * to be read, typically "reg".
970 * @match: Return non-zero if the node whose parent is at
971 * parentoffset in the FDT blob corresponds to a bus
972 * of this type, otherwise return zero. If NULL a match
974 * @count_cells:Count how many cells (be32 values) a node whose parent
975 * is at parentoffset in the FDT blob will require to
976 * represent its address (written to *addrc) & size
977 * (written to *sizec).
978 * @map: Map the address addr from the address space of this
979 * bus to that of its parent, making use of the ranges
980 * read from DT to an array at range. na and ns are the
981 * number of cells (be32 values) used to hold and address
982 * or size, respectively, for this bus. pna is the number
983 * of cells used to hold an address for the parent bus.
984 * Returns the address in the address space of the parent
986 * @translate: Update the value of the address cells at addr within an
987 * FDT by adding offset to it. na specifies the number of
988 * cells used to hold the address being translated. Returns
989 * zero on success, non-zero on error.
991 * Each bus type will include a struct of_bus in the of_busses array,
992 * providing implementations of some or all of the functions used to
993 * match the bus & handle address translation for its children.
997 const char *addresses;
998 int (*match)(const void *blob, int parentoffset);
999 void (*count_cells)(const void *blob, int parentoffset,
1000 int *addrc, int *sizec);
1001 u64 (*map)(fdt32_t *addr, const fdt32_t *range,
1002 int na, int ns, int pna);
1003 int (*translate)(fdt32_t *addr, u64 offset, int na);
1006 /* Default translator (generic bus) */
1007 void of_bus_default_count_cells(const void *blob, int parentoffset,
1008 int *addrc, int *sizec)
1010 const fdt32_t *prop;
1013 *addrc = fdt_address_cells(blob, parentoffset);
1016 prop = fdt_getprop(blob, parentoffset, "#size-cells", NULL);
1018 *sizec = be32_to_cpup(prop);
1024 static u64 of_bus_default_map(fdt32_t *addr, const fdt32_t *range,
1025 int na, int ns, int pna)
1029 cp = of_read_number(range, na);
1030 s = of_read_number(range + na + pna, ns);
1031 da = of_read_number(addr, na);
1033 debug("OF: default map, cp=%" PRIu64 ", s=%" PRIu64
1034 ", da=%" PRIu64 "\n", cp, s, da);
1036 if (da < cp || da >= (cp + s))
1041 static int of_bus_default_translate(fdt32_t *addr, u64 offset, int na)
1043 u64 a = of_read_number(addr, na);
1044 memset(addr, 0, na * 4);
1047 addr[na - 2] = cpu_to_fdt32(a >> 32);
1048 addr[na - 1] = cpu_to_fdt32(a & 0xffffffffu);
1053 #ifdef CONFIG_OF_ISA_BUS
1055 /* ISA bus translator */
1056 static int of_bus_isa_match(const void *blob, int parentoffset)
1060 name = fdt_get_name(blob, parentoffset, NULL);
1064 return !strcmp(name, "isa");
1067 static void of_bus_isa_count_cells(const void *blob, int parentoffset,
1068 int *addrc, int *sizec)
1076 static u64 of_bus_isa_map(fdt32_t *addr, const fdt32_t *range,
1077 int na, int ns, int pna)
1081 /* Check address type match */
1082 if ((addr[0] ^ range[0]) & cpu_to_be32(1))
1085 cp = of_read_number(range + 1, na - 1);
1086 s = of_read_number(range + na + pna, ns);
1087 da = of_read_number(addr + 1, na - 1);
1089 debug("OF: ISA map, cp=%" PRIu64 ", s=%" PRIu64
1090 ", da=%" PRIu64 "\n", cp, s, da);
1092 if (da < cp || da >= (cp + s))
1097 static int of_bus_isa_translate(fdt32_t *addr, u64 offset, int na)
1099 return of_bus_default_translate(addr + 1, offset, na - 1);
1102 #endif /* CONFIG_OF_ISA_BUS */
1104 /* Array of bus specific translators */
1105 static struct of_bus of_busses[] = {
1106 #ifdef CONFIG_OF_ISA_BUS
1111 .match = of_bus_isa_match,
1112 .count_cells = of_bus_isa_count_cells,
1113 .map = of_bus_isa_map,
1114 .translate = of_bus_isa_translate,
1116 #endif /* CONFIG_OF_ISA_BUS */
1121 .count_cells = of_bus_default_count_cells,
1122 .map = of_bus_default_map,
1123 .translate = of_bus_default_translate,
1127 static struct of_bus *of_match_bus(const void *blob, int parentoffset)
1131 if (ARRAY_SIZE(of_busses) == 1)
1134 for (bus = of_busses; bus; bus++) {
1135 if (!bus->match || bus->match(blob, parentoffset))
1140 * We should always have matched the default bus at least, since
1141 * it has a NULL match field. If we didn't then it somehow isn't
1142 * in the of_busses array or something equally catastrophic has
1149 static int of_translate_one(const void *blob, int parent, struct of_bus *bus,
1150 struct of_bus *pbus, fdt32_t *addr,
1151 int na, int ns, int pna, const char *rprop)
1153 const fdt32_t *ranges;
1156 u64 offset = OF_BAD_ADDR;
1158 /* Normally, an absence of a "ranges" property means we are
1159 * crossing a non-translatable boundary, and thus the addresses
1160 * below the current not cannot be converted to CPU physical ones.
1161 * Unfortunately, while this is very clear in the spec, it's not
1162 * what Apple understood, and they do have things like /uni-n or
1163 * /ht nodes with no "ranges" property and a lot of perfectly
1164 * useable mapped devices below them. Thus we treat the absence of
1165 * "ranges" as equivalent to an empty "ranges" property which means
1166 * a 1:1 translation at that level. It's up to the caller not to try
1167 * to translate addresses that aren't supposed to be translated in
1168 * the first place. --BenH.
1170 ranges = fdt_getprop(blob, parent, rprop, &rlen);
1171 if (ranges == NULL || rlen == 0) {
1172 offset = of_read_number(addr, na);
1173 memset(addr, 0, pna * 4);
1174 debug("OF: no ranges, 1:1 translation\n");
1178 debug("OF: walking ranges...\n");
1180 /* Now walk through the ranges */
1182 rone = na + pna + ns;
1183 for (; rlen >= rone; rlen -= rone, ranges += rone) {
1184 offset = bus->map(addr, ranges, na, ns, pna);
1185 if (offset != OF_BAD_ADDR)
1188 if (offset == OF_BAD_ADDR) {
1189 debug("OF: not found !\n");
1192 memcpy(addr, ranges + na, 4 * pna);
1195 of_dump_addr("OF: parent translation for:", addr, pna);
1196 debug("OF: with offset: %" PRIu64 "\n", offset);
1198 /* Translate it into parent bus space */
1199 return pbus->translate(addr, offset, pna);
1203 * Translate an address from the device-tree into a CPU physical address,
1204 * this walks up the tree and applies the various bus mappings on the
1207 * Note: We consider that crossing any level with #size-cells == 0 to mean
1208 * that translation is impossible (that is we are not dealing with a value
1209 * that can be mapped to a cpu physical address). This is not really specified
1210 * that way, but this is traditionally the way IBM at least do things
1212 static u64 __of_translate_address(const void *blob, int node_offset,
1213 const fdt32_t *in_addr, const char *rprop)
1216 struct of_bus *bus, *pbus;
1217 fdt32_t addr[OF_MAX_ADDR_CELLS];
1218 int na, ns, pna, pns;
1219 u64 result = OF_BAD_ADDR;
1221 debug("OF: ** translation for device %s **\n",
1222 fdt_get_name(blob, node_offset, NULL));
1224 /* Get parent & match bus type */
1225 parent = fdt_parent_offset(blob, node_offset);
1228 bus = of_match_bus(blob, parent);
1230 /* Cound address cells & copy address locally */
1231 bus->count_cells(blob, parent, &na, &ns);
1232 if (!OF_CHECK_COUNTS(na, ns)) {
1233 printf("%s: Bad cell count for %s\n", __FUNCTION__,
1234 fdt_get_name(blob, node_offset, NULL));
1237 memcpy(addr, in_addr, na * 4);
1239 debug("OF: bus is %s (na=%d, ns=%d) on %s\n",
1240 bus->name, na, ns, fdt_get_name(blob, parent, NULL));
1241 of_dump_addr("OF: translating address:", addr, na);
1245 /* Switch to parent bus */
1246 node_offset = parent;
1247 parent = fdt_parent_offset(blob, node_offset);
1249 /* If root, we have finished */
1251 debug("OF: reached root node\n");
1252 result = of_read_number(addr, na);
1256 /* Get new parent bus and counts */
1257 pbus = of_match_bus(blob, parent);
1258 pbus->count_cells(blob, parent, &pna, &pns);
1259 if (!OF_CHECK_COUNTS(pna, pns)) {
1260 printf("%s: Bad cell count for %s\n", __FUNCTION__,
1261 fdt_get_name(blob, node_offset, NULL));
1265 debug("OF: parent bus is %s (na=%d, ns=%d) on %s\n",
1266 pbus->name, pna, pns, fdt_get_name(blob, parent, NULL));
1268 /* Apply bus translation */
1269 if (of_translate_one(blob, node_offset, bus, pbus,
1270 addr, na, ns, pna, rprop))
1273 /* Complete the move up one level */
1278 of_dump_addr("OF: one level translation:", addr, na);
1285 u64 fdt_translate_address(const void *blob, int node_offset,
1286 const fdt32_t *in_addr)
1288 return __of_translate_address(blob, node_offset, in_addr, "ranges");
1292 * fdt_node_offset_by_compat_reg: Find a node that matches compatiable and
1293 * who's reg property matches a physical cpu address
1295 * @blob: ptr to device tree
1296 * @compat: compatiable string to match
1297 * @compat_off: property name
1300 int fdt_node_offset_by_compat_reg(void *blob, const char *compat,
1301 phys_addr_t compat_off)
1303 int len, off = fdt_node_offset_by_compatible(blob, -1, compat);
1304 while (off != -FDT_ERR_NOTFOUND) {
1305 const fdt32_t *reg = fdt_getprop(blob, off, "reg", &len);
1307 if (compat_off == fdt_translate_address(blob, off, reg))
1310 off = fdt_node_offset_by_compatible(blob, off, compat);
1313 return -FDT_ERR_NOTFOUND;
1317 * fdt_alloc_phandle: Return next free phandle value
1319 * @blob: ptr to device tree
1321 int fdt_alloc_phandle(void *blob)
1324 uint32_t phandle = 0;
1326 for (offset = fdt_next_node(blob, -1, NULL); offset >= 0;
1327 offset = fdt_next_node(blob, offset, NULL)) {
1328 phandle = max(phandle, fdt_get_phandle(blob, offset));
1335 * fdt_set_phandle: Create a phandle property for the given node
1337 * @fdt: ptr to device tree
1338 * @nodeoffset: node to update
1339 * @phandle: phandle value to set (must be unique)
1341 int fdt_set_phandle(void *fdt, int nodeoffset, uint32_t phandle)
1346 int off = fdt_node_offset_by_phandle(fdt, phandle);
1348 if ((off >= 0) && (off != nodeoffset)) {
1351 fdt_get_path(fdt, nodeoffset, buf, sizeof(buf));
1352 printf("Trying to update node %s with phandle %u ",
1355 fdt_get_path(fdt, off, buf, sizeof(buf));
1356 printf("that already exists in node %s.\n", buf);
1357 return -FDT_ERR_BADPHANDLE;
1361 ret = fdt_setprop_cell(fdt, nodeoffset, "phandle", phandle);
1366 * For now, also set the deprecated "linux,phandle" property, so that we
1367 * don't break older kernels.
1369 ret = fdt_setprop_cell(fdt, nodeoffset, "linux,phandle", phandle);
1375 * fdt_create_phandle: Create a phandle property for the given node
1377 * @fdt: ptr to device tree
1378 * @nodeoffset: node to update
1380 unsigned int fdt_create_phandle(void *fdt, int nodeoffset)
1382 /* see if there is a phandle already */
1383 int phandle = fdt_get_phandle(fdt, nodeoffset);
1385 /* if we got 0, means no phandle so create one */
1389 phandle = fdt_alloc_phandle(fdt);
1390 ret = fdt_set_phandle(fdt, nodeoffset, phandle);
1392 printf("Can't set phandle %u: %s\n", phandle,
1402 * fdt_set_node_status: Set status for the given node
1404 * @fdt: ptr to device tree
1405 * @nodeoffset: node to update
1406 * @status: FDT_STATUS_OKAY, FDT_STATUS_DISABLED,
1407 * FDT_STATUS_FAIL, FDT_STATUS_FAIL_ERROR_CODE
1408 * @error_code: optional, only used if status is FDT_STATUS_FAIL_ERROR_CODE
1410 int fdt_set_node_status(void *fdt, int nodeoffset,
1411 enum fdt_status status, unsigned int error_code)
1420 case FDT_STATUS_OKAY:
1421 ret = fdt_setprop_string(fdt, nodeoffset, "status", "okay");
1423 case FDT_STATUS_DISABLED:
1424 ret = fdt_setprop_string(fdt, nodeoffset, "status", "disabled");
1426 case FDT_STATUS_FAIL:
1427 ret = fdt_setprop_string(fdt, nodeoffset, "status", "fail");
1429 case FDT_STATUS_FAIL_ERROR_CODE:
1430 sprintf(buf, "fail-%d", error_code);
1431 ret = fdt_setprop_string(fdt, nodeoffset, "status", buf);
1434 printf("Invalid fdt status: %x\n", status);
1443 * fdt_set_status_by_alias: Set status for the given node given an alias
1445 * @fdt: ptr to device tree
1446 * @alias: alias of node to update
1447 * @status: FDT_STATUS_OKAY, FDT_STATUS_DISABLED,
1448 * FDT_STATUS_FAIL, FDT_STATUS_FAIL_ERROR_CODE
1449 * @error_code: optional, only used if status is FDT_STATUS_FAIL_ERROR_CODE
1451 int fdt_set_status_by_alias(void *fdt, const char* alias,
1452 enum fdt_status status, unsigned int error_code)
1454 int offset = fdt_path_offset(fdt, alias);
1456 return fdt_set_node_status(fdt, offset, status, error_code);
1459 #if defined(CONFIG_VIDEO) || defined(CONFIG_LCD)
1460 int fdt_add_edid(void *blob, const char *compat, unsigned char *edid_buf)
1465 noff = fdt_node_offset_by_compatible(blob, -1, compat);
1466 if (noff != -FDT_ERR_NOTFOUND) {
1467 debug("%s: %s\n", fdt_get_name(blob, noff, 0), compat);
1469 ret = fdt_setprop(blob, noff, "edid", edid_buf, 128);
1470 if (ret == -FDT_ERR_NOSPACE) {
1471 ret = fdt_increase_size(blob, 512);
1476 } else if (ret < 0) {
1477 printf("Can't add property: %s\n", fdt_strerror(ret));
1483 printf("Can't increase blob size: %s\n", fdt_strerror(ret));
1489 * Verify the physical address of device tree node for a given alias
1491 * This function locates the device tree node of a given alias, and then
1492 * verifies that the physical address of that device matches the given
1493 * parameter. It displays a message if there is a mismatch.
1495 * Returns 1 on success, 0 on failure
1497 int fdt_verify_alias_address(void *fdt, int anode, const char *alias, u64 addr)
1504 path = fdt_getprop(fdt, anode, alias, NULL);
1506 /* If there's no such alias, then it's not a failure */
1510 node = fdt_path_offset(fdt, path);
1512 printf("Warning: device tree alias '%s' points to invalid "
1513 "node %s.\n", alias, path);
1517 reg = fdt_getprop(fdt, node, "reg", &len);
1519 printf("Warning: device tree node '%s' has no address.\n",
1524 dt_addr = fdt_translate_address(fdt, node, reg);
1525 if (addr != dt_addr) {
1526 printf("Warning: U-Boot configured device %s at address %"
1527 PRIx64 ",\n but the device tree has it address %"
1528 PRIx64 ".\n", alias, addr, dt_addr);
1536 * Returns the base address of an SOC or PCI node
1538 u64 fdt_get_base_address(void *fdt, int node)
1542 const fdt32_t *prop;
1544 naddr = fdt_address_cells(fdt, node);
1546 prop = fdt_getprop(fdt, node, "ranges", &size);
1548 return prop ? fdt_translate_address(fdt, node, prop + naddr) : 0;
1552 * Read a property of size <prop_len>. Currently only supports 1 or 2 cells.
1554 static int fdt_read_prop(const fdt32_t *prop, int prop_len, int cell_off,
1555 uint64_t *val, int cells)
1557 const fdt32_t *prop32 = &prop[cell_off];
1558 const fdt64_t *prop64 = (const fdt64_t *)&prop[cell_off];
1560 if ((cell_off + cells) > prop_len)
1561 return -FDT_ERR_NOSPACE;
1565 *val = fdt32_to_cpu(*prop32);
1568 *val = fdt64_to_cpu(*prop64);
1571 return -FDT_ERR_NOSPACE;
1578 * fdt_read_range - Read a node's n'th range property
1580 * @fdt: ptr to device tree
1581 * @node: offset of node
1583 * @child_addr: pointer to storage for the "child address" field
1584 * @addr: pointer to storage for the CPU view translated physical start
1585 * @len: pointer to storage for the range length
1587 * Convenience function that reads and interprets a specific range out of
1588 * a number of the "ranges" property array.
1590 int fdt_read_range(void *fdt, int node, int n, uint64_t *child_addr,
1591 uint64_t *addr, uint64_t *len)
1593 int pnode = fdt_parent_offset(fdt, node);
1594 const fdt32_t *ranges;
1603 * The "ranges" property is an array of
1604 * { <child address> <parent address> <size in child address space> }
1606 * All 3 elements can span a diffent number of cells. Fetch their size.
1608 pacells = fdt_getprop_u32_default_node(fdt, pnode, 0, "#address-cells", 1);
1609 acells = fdt_getprop_u32_default_node(fdt, node, 0, "#address-cells", 1);
1610 scells = fdt_getprop_u32_default_node(fdt, node, 0, "#size-cells", 1);
1612 /* Now try to get the ranges property */
1613 ranges = fdt_getprop(fdt, node, "ranges", &ranges_len);
1615 return -FDT_ERR_NOTFOUND;
1616 ranges_len /= sizeof(uint32_t);
1618 /* Jump to the n'th entry */
1619 cell = n * (pacells + acells + scells);
1621 /* Read <child address> */
1623 r = fdt_read_prop(ranges, ranges_len, cell, child_addr,
1630 /* Read <parent address> */
1632 *addr = fdt_translate_address(fdt, node, ranges + cell);
1635 /* Read <size in child address space> */
1637 r = fdt_read_prop(ranges, ranges_len, cell, len, scells);
1646 * fdt_setup_simplefb_node - Fill and enable a simplefb node
1648 * @fdt: ptr to device tree
1649 * @node: offset of the simplefb node
1650 * @base_address: framebuffer base address
1651 * @width: width in pixels
1652 * @height: height in pixels
1653 * @stride: bytes per line
1654 * @format: pixel format string
1656 * Convenience function to fill and enable a simplefb node.
1658 int fdt_setup_simplefb_node(void *fdt, int node, u64 base_address, u32 width,
1659 u32 height, u32 stride, const char *format)
1663 int i, addrc, sizec, ret;
1665 of_bus_default_count_cells(fdt, fdt_parent_offset(fdt, node),
1669 cells[i++] = cpu_to_fdt32(base_address >> 32);
1670 cells[i++] = cpu_to_fdt32(base_address);
1673 cells[i++] = cpu_to_fdt32(height * stride);
1675 ret = fdt_setprop(fdt, node, "reg", cells, sizeof(cells[0]) * i);
1679 snprintf(name, sizeof(name), "framebuffer@%" PRIx64, base_address);
1680 ret = fdt_set_name(fdt, node, name);
1684 ret = fdt_setprop_u32(fdt, node, "width", width);
1688 ret = fdt_setprop_u32(fdt, node, "height", height);
1692 ret = fdt_setprop_u32(fdt, node, "stride", stride);
1696 ret = fdt_setprop_string(fdt, node, "format", format);
1700 ret = fdt_setprop_string(fdt, node, "status", "okay");
1708 * Update native-mode in display-timings from display environment variable.
1709 * The node to update are specified by path.
1711 int fdt_fixup_display(void *blob, const char *path, const char *display)
1715 if (!display || !path)
1716 return -FDT_ERR_NOTFOUND;
1718 toff = fdt_path_offset(blob, path);
1720 toff = fdt_subnode_offset(blob, toff, "display-timings");
1724 for (off = fdt_first_subnode(blob, toff);
1726 off = fdt_next_subnode(blob, off)) {
1727 uint32_t h = fdt_get_phandle(blob, off);
1728 debug("%s:0x%x\n", fdt_get_name(blob, off, NULL),
1730 if (strcasecmp(fdt_get_name(blob, off, NULL), display) == 0)
1731 return fdt_setprop_u32(blob, toff, "native-mode", h);