1 // SPDX-License-Identifier: GPL-2.0+
4 * Gerald Van Baren, Custom IDEAS, vanbaren@cideas.com
6 * Copyright 2010-2011 Freescale Semiconductor, Inc.
14 #include <stdio_dev.h>
15 #include <linux/ctype.h>
16 #include <linux/types.h>
17 #include <asm/global_data.h>
18 #include <linux/libfdt.h>
19 #include <fdt_support.h>
24 * fdt_getprop_u32_default_node - Return a node's property or a default
26 * @fdt: ptr to device tree
27 * @off: offset of node
28 * @cell: cell offset in property
29 * @prop: property name
30 * @dflt: default value if the property isn't found
32 * Convenience function to return a node's property or a default value if
33 * the property doesn't exist.
35 u32 fdt_getprop_u32_default_node(const void *fdt, int off, int cell,
36 const char *prop, const u32 dflt)
41 val = fdt_getprop(fdt, off, prop, &len);
43 /* Check if property exists */
47 /* Check if property is long enough */
48 if (len < ((cell + 1) * sizeof(uint32_t)))
51 return fdt32_to_cpu(*val);
55 * fdt_getprop_u32_default - Find a node and return it's property or a default
57 * @fdt: ptr to device tree
59 * @prop: property name
60 * @dflt: default value if the property isn't found
62 * Convenience function to find a node and return it's property or a
63 * default value if it doesn't exist.
65 u32 fdt_getprop_u32_default(const void *fdt, const char *path,
66 const char *prop, const u32 dflt)
70 off = fdt_path_offset(fdt, path);
74 return fdt_getprop_u32_default_node(fdt, off, 0, prop, dflt);
78 * fdt_find_and_setprop: Find a node and set it's property
80 * @fdt: ptr to device tree
82 * @prop: property name
83 * @val: ptr to new value
84 * @len: length of new property value
85 * @create: flag to create the property if it doesn't exist
87 * Convenience function to directly set a property given the path to the node.
89 int fdt_find_and_setprop(void *fdt, const char *node, const char *prop,
90 const void *val, int len, int create)
92 int nodeoff = fdt_path_offset(fdt, node);
97 if ((!create) && (fdt_get_property(fdt, nodeoff, prop, NULL) == NULL))
98 return 0; /* create flag not set; so exit quietly */
100 return fdt_setprop(fdt, nodeoff, prop, val, len);
104 * fdt_find_or_add_subnode() - find or possibly add a subnode of a given node
106 * @fdt: pointer to the device tree blob
107 * @parentoffset: structure block offset of a node
108 * @name: name of the subnode to locate
110 * fdt_subnode_offset() finds a subnode of the node with a given name.
111 * If the subnode does not exist, it will be created.
113 int fdt_find_or_add_subnode(void *fdt, int parentoffset, const char *name)
117 offset = fdt_subnode_offset(fdt, parentoffset, name);
119 if (offset == -FDT_ERR_NOTFOUND)
120 offset = fdt_add_subnode(fdt, parentoffset, name);
123 printf("%s: %s: %s\n", __func__, name, fdt_strerror(offset));
128 /* rename to CONFIG_OF_STDOUT_PATH ? */
129 #if defined(OF_STDOUT_PATH)
130 static int fdt_fixup_stdout(void *fdt, int chosenoff)
132 return fdt_setprop(fdt, chosenoff, "linux,stdout-path",
133 OF_STDOUT_PATH, strlen(OF_STDOUT_PATH) + 1);
135 #elif defined(CONFIG_OF_STDOUT_VIA_ALIAS) && defined(CONFIG_CONS_INDEX)
136 static int fdt_fixup_stdout(void *fdt, int chosenoff)
140 char sername[9] = { 0 };
143 char tmp[256]; /* long enough */
145 sprintf(sername, "serial%d", CONFIG_CONS_INDEX - 1);
147 aliasoff = fdt_path_offset(fdt, "/aliases");
153 path = fdt_getprop(fdt, aliasoff, sername, &len);
159 /* fdt_setprop may break "path" so we copy it to tmp buffer */
160 memcpy(tmp, path, len);
162 err = fdt_setprop(fdt, chosenoff, "linux,stdout-path", tmp, len);
164 printf("WARNING: could not set linux,stdout-path %s.\n",
170 printf("WARNING: %s: could not read %s alias: %s\n",
171 __func__, sername, fdt_strerror(err));
176 static int fdt_fixup_stdout(void *fdt, int chosenoff)
182 static inline int fdt_setprop_uxx(void *fdt, int nodeoffset, const char *name,
183 uint64_t val, int is_u64)
186 return fdt_setprop_u64(fdt, nodeoffset, name, val);
188 return fdt_setprop_u32(fdt, nodeoffset, name, (uint32_t)val);
191 int fdt_root(void *fdt)
196 err = fdt_check_header(fdt);
198 printf("fdt_root: %s\n", fdt_strerror(err));
202 serial = env_get("serial#");
204 err = fdt_setprop(fdt, 0, "serial-number", serial,
208 printf("WARNING: could not set serial-number %s.\n",
217 int fdt_initrd(void *fdt, ulong initrd_start, ulong initrd_end)
224 /* just return if the size of initrd is zero */
225 if (initrd_start == initrd_end)
228 /* find or create "/chosen" node. */
229 nodeoffset = fdt_find_or_add_subnode(fdt, 0, "chosen");
233 total = fdt_num_mem_rsv(fdt);
236 * Look for an existing entry and update it. If we don't find
237 * the entry, we will j be the next available slot.
239 for (j = 0; j < total; j++) {
240 err = fdt_get_mem_rsv(fdt, j, &addr, &size);
241 if (addr == initrd_start) {
242 fdt_del_mem_rsv(fdt, j);
247 err = fdt_add_mem_rsv(fdt, initrd_start, initrd_end - initrd_start);
249 printf("fdt_initrd: %s\n", fdt_strerror(err));
253 is_u64 = (fdt_address_cells(fdt, 0) == 2);
255 err = fdt_setprop_uxx(fdt, nodeoffset, "linux,initrd-start",
256 (uint64_t)initrd_start, is_u64);
259 printf("WARNING: could not set linux,initrd-start %s.\n",
264 err = fdt_setprop_uxx(fdt, nodeoffset, "linux,initrd-end",
265 (uint64_t)initrd_end, is_u64);
268 printf("WARNING: could not set linux,initrd-end %s.\n",
277 int fdt_chosen(void *fdt)
281 char *str; /* used to set string properties */
283 err = fdt_check_header(fdt);
285 printf("fdt_chosen: %s\n", fdt_strerror(err));
289 /* find or create "/chosen" node. */
290 nodeoffset = fdt_find_or_add_subnode(fdt, 0, "chosen");
294 str = env_get("bootargs");
296 err = fdt_setprop(fdt, nodeoffset, "bootargs", str,
299 printf("WARNING: could not set bootargs %s.\n",
305 return fdt_fixup_stdout(fdt, nodeoffset);
308 void do_fixup_by_path(void *fdt, const char *path, const char *prop,
309 const void *val, int len, int create)
313 debug("Updating property '%s/%s' = ", path, prop);
314 for (i = 0; i < len; i++)
315 debug(" %.2x", *(u8*)(val+i));
318 int rc = fdt_find_and_setprop(fdt, path, prop, val, len, create);
320 printf("Unable to update property %s:%s, err=%s\n",
321 path, prop, fdt_strerror(rc));
324 void do_fixup_by_path_u32(void *fdt, const char *path, const char *prop,
327 fdt32_t tmp = cpu_to_fdt32(val);
328 do_fixup_by_path(fdt, path, prop, &tmp, sizeof(tmp), create);
331 void do_fixup_by_prop(void *fdt,
332 const char *pname, const void *pval, int plen,
333 const char *prop, const void *val, int len,
339 debug("Updating property '%s' = ", prop);
340 for (i = 0; i < len; i++)
341 debug(" %.2x", *(u8*)(val+i));
344 off = fdt_node_offset_by_prop_value(fdt, -1, pname, pval, plen);
345 while (off != -FDT_ERR_NOTFOUND) {
346 if (create || (fdt_get_property(fdt, off, prop, NULL) != NULL))
347 fdt_setprop(fdt, off, prop, val, len);
348 off = fdt_node_offset_by_prop_value(fdt, off, pname, pval, plen);
352 void do_fixup_by_prop_u32(void *fdt,
353 const char *pname, const void *pval, int plen,
354 const char *prop, u32 val, int create)
356 fdt32_t tmp = cpu_to_fdt32(val);
357 do_fixup_by_prop(fdt, pname, pval, plen, prop, &tmp, 4, create);
360 void do_fixup_by_compat(void *fdt, const char *compat,
361 const char *prop, const void *val, int len, int create)
366 debug("Updating property '%s' = ", prop);
367 for (i = 0; i < len; i++)
368 debug(" %.2x", *(u8*)(val+i));
371 off = fdt_node_offset_by_compatible(fdt, -1, compat);
372 while (off != -FDT_ERR_NOTFOUND) {
373 if (create || (fdt_get_property(fdt, off, prop, NULL) != NULL))
374 fdt_setprop(fdt, off, prop, val, len);
375 off = fdt_node_offset_by_compatible(fdt, off, compat);
379 void do_fixup_by_compat_u32(void *fdt, const char *compat,
380 const char *prop, u32 val, int create)
382 fdt32_t tmp = cpu_to_fdt32(val);
383 do_fixup_by_compat(fdt, compat, prop, &tmp, 4, create);
386 #ifdef CONFIG_ARCH_FIXUP_FDT_MEMORY
388 * fdt_pack_reg - pack address and size array into the "reg"-suitable stream
390 static int fdt_pack_reg(const void *fdt, void *buf, u64 *address, u64 *size,
394 int address_cells = fdt_address_cells(fdt, 0);
395 int size_cells = fdt_size_cells(fdt, 0);
398 for (i = 0; i < n; i++) {
399 if (address_cells == 2)
400 *(fdt64_t *)p = cpu_to_fdt64(address[i]);
402 *(fdt32_t *)p = cpu_to_fdt32(address[i]);
403 p += 4 * address_cells;
406 *(fdt64_t *)p = cpu_to_fdt64(size[i]);
408 *(fdt32_t *)p = cpu_to_fdt32(size[i]);
412 return p - (char *)buf;
415 #if CONFIG_NR_DRAM_BANKS > 4
416 #define MEMORY_BANKS_MAX CONFIG_NR_DRAM_BANKS
418 #define MEMORY_BANKS_MAX 4
420 int fdt_fixup_memory_banks(void *blob, u64 start[], u64 size[], int banks)
424 u8 tmp[MEMORY_BANKS_MAX * 16]; /* Up to 64-bit address + 64-bit size */
426 if (banks > MEMORY_BANKS_MAX) {
427 printf("%s: num banks %d exceeds hardcoded limit %d."
428 " Recompile with higher MEMORY_BANKS_MAX?\n",
429 __FUNCTION__, banks, MEMORY_BANKS_MAX);
433 err = fdt_check_header(blob);
435 printf("%s: %s\n", __FUNCTION__, fdt_strerror(err));
439 /* find or create "/memory" node. */
440 nodeoffset = fdt_find_or_add_subnode(blob, 0, "memory");
444 err = fdt_setprop(blob, nodeoffset, "device_type", "memory",
447 printf("WARNING: could not set %s %s.\n", "device_type",
452 for (i = 0; i < banks; i++) {
453 if (start[i] == 0 && size[i] == 0)
462 len = fdt_pack_reg(blob, tmp, start, size, banks);
464 err = fdt_setprop(blob, nodeoffset, "reg", tmp, len);
466 printf("WARNING: could not set %s %s.\n",
467 "reg", fdt_strerror(err));
473 int fdt_set_usable_memory(void *blob, u64 start[], u64 size[], int areas)
477 u8 tmp[8 * 16]; /* Up to 64-bit address + 64-bit size */
480 printf("%s: num areas %d exceeds hardcoded limit %d\n",
485 err = fdt_check_header(blob);
487 printf("%s: %s\n", __func__, fdt_strerror(err));
491 /* find or create "/memory" node. */
492 nodeoffset = fdt_find_or_add_subnode(blob, 0, "memory");
496 len = fdt_pack_reg(blob, tmp, start, size, areas);
498 err = fdt_setprop(blob, nodeoffset, "linux,usable-memory", tmp, len);
500 printf("WARNING: could not set %s %s.\n",
501 "reg", fdt_strerror(err));
509 int fdt_fixup_memory(void *blob, u64 start, u64 size)
511 return fdt_fixup_memory_banks(blob, &start, &size, 1);
514 void fdt_fixup_ethernet(void *fdt)
520 unsigned char mac_addr[ARP_HLEN];
522 #ifdef FDT_SEQ_MACADDR_FROM_ENV
524 const struct fdt_property *fdt_prop;
527 if (fdt_path_offset(fdt, "/aliases") < 0)
530 /* Cycle through all aliases */
531 for (prop = 0; ; prop++) {
534 /* FDT might have been edited, recompute the offset */
535 offset = fdt_first_property_offset(fdt,
536 fdt_path_offset(fdt, "/aliases"));
537 /* Select property number 'prop' */
538 for (j = 0; j < prop; j++)
539 offset = fdt_next_property_offset(fdt, offset);
544 path = fdt_getprop_by_offset(fdt, offset, &name, NULL);
545 if (!strncmp(name, "ethernet", 8)) {
546 /* Treat plain "ethernet" same as "ethernet0". */
547 if (!strcmp(name, "ethernet")
548 #ifdef FDT_SEQ_MACADDR_FROM_ENV
549 || !strcmp(name, "ethernet0")
553 #ifndef FDT_SEQ_MACADDR_FROM_ENV
555 i = trailing_strtol(name);
559 strcpy(mac, "ethaddr");
561 sprintf(mac, "eth%daddr", i);
565 #ifdef FDT_SEQ_MACADDR_FROM_ENV
566 nodeoff = fdt_path_offset(fdt, path);
567 fdt_prop = fdt_get_property(fdt, nodeoff, "status",
569 if (fdt_prop && !strcmp(fdt_prop->data, "disabled"))
577 for (j = 0; j < 6; j++) {
579 simple_strtoul(tmp, &end, 16) : 0;
581 tmp = (*end) ? end + 1 : end;
584 do_fixup_by_path(fdt, path, "mac-address",
586 do_fixup_by_path(fdt, path, "local-mac-address",
592 int fdt_record_loadable(void *blob, u32 index, const char *name,
593 uintptr_t load_addr, u32 size, uintptr_t entry_point,
594 const char *type, const char *os)
598 err = fdt_check_header(blob);
600 printf("%s: %s\n", __func__, fdt_strerror(err));
604 /* find or create "/fit-images" node */
605 node = fdt_find_or_add_subnode(blob, 0, "fit-images");
609 /* find or create "/fit-images/<name>" node */
610 node = fdt_find_or_add_subnode(blob, node, name);
614 fdt_setprop_u64(blob, node, "load", load_addr);
615 if (entry_point != -1)
616 fdt_setprop_u64(blob, node, "entry", entry_point);
617 fdt_setprop_u32(blob, node, "size", size);
619 fdt_setprop_string(blob, node, "type", type);
621 fdt_setprop_string(blob, node, "os", os);
626 /* Resize the fdt to its actual size + a bit of padding */
627 int fdt_shrink_to_minimum(void *blob, uint extrasize)
638 total = fdt_num_mem_rsv(blob);
639 for (i = 0; i < total; i++) {
640 fdt_get_mem_rsv(blob, i, &addr, &size);
641 if (addr == (uintptr_t)blob) {
642 fdt_del_mem_rsv(blob, i);
649 * Calculate the actual size of the fdt
650 * plus the size needed for 5 fdt_add_mem_rsv, one
651 * for the fdt itself and 4 for a possible initrd
652 * ((initrd-start + initrd-end) * 2 (name & value))
654 actualsize = fdt_off_dt_strings(blob) +
655 fdt_size_dt_strings(blob) + 5 * sizeof(struct fdt_reserve_entry);
657 actualsize += extrasize;
658 /* Make it so the fdt ends on a page boundary */
659 actualsize = ALIGN(actualsize + ((uintptr_t)blob & 0xfff), 0x1000);
660 actualsize = actualsize - ((uintptr_t)blob & 0xfff);
662 /* Change the fdt header to reflect the correct size */
663 fdt_set_totalsize(blob, actualsize);
666 /* Add the new reservation */
667 ret = fdt_add_mem_rsv(blob, map_to_sysmem(blob), actualsize);
676 #define CONFIG_SYS_PCI_NR_INBOUND_WIN 4
678 #define FDT_PCI_PREFETCH (0x40000000)
679 #define FDT_PCI_MEM32 (0x02000000)
680 #define FDT_PCI_IO (0x01000000)
681 #define FDT_PCI_MEM64 (0x03000000)
683 int fdt_pci_dma_ranges(void *blob, int phb_off, struct pci_controller *hose) {
685 int addrcell, sizecell, len, r;
687 /* sized based on pci addr cells, size-cells, & address-cells */
688 u32 dma_ranges[(3 + 2 + 2) * CONFIG_SYS_PCI_NR_INBOUND_WIN];
690 addrcell = fdt_getprop_u32_default(blob, "/", "#address-cells", 1);
691 sizecell = fdt_getprop_u32_default(blob, "/", "#size-cells", 1);
693 dma_range = &dma_ranges[0];
694 for (r = 0; r < hose->region_count; r++) {
695 u64 bus_start, phys_start, size;
697 /* skip if !PCI_REGION_SYS_MEMORY */
698 if (!(hose->regions[r].flags & PCI_REGION_SYS_MEMORY))
701 bus_start = (u64)hose->regions[r].bus_start;
702 phys_start = (u64)hose->regions[r].phys_start;
703 size = (u64)hose->regions[r].size;
706 if (size >= 0x100000000ull)
707 dma_range[0] |= cpu_to_fdt32(FDT_PCI_MEM64);
709 dma_range[0] |= cpu_to_fdt32(FDT_PCI_MEM32);
710 if (hose->regions[r].flags & PCI_REGION_PREFETCH)
711 dma_range[0] |= cpu_to_fdt32(FDT_PCI_PREFETCH);
712 #ifdef CONFIG_SYS_PCI_64BIT
713 dma_range[1] = cpu_to_fdt32(bus_start >> 32);
717 dma_range[2] = cpu_to_fdt32(bus_start & 0xffffffff);
720 dma_range[3] = cpu_to_fdt32(phys_start >> 32);
721 dma_range[4] = cpu_to_fdt32(phys_start & 0xffffffff);
723 dma_range[3] = cpu_to_fdt32(phys_start & 0xffffffff);
727 dma_range[3 + addrcell + 0] =
728 cpu_to_fdt32(size >> 32);
729 dma_range[3 + addrcell + 1] =
730 cpu_to_fdt32(size & 0xffffffff);
732 dma_range[3 + addrcell + 0] =
733 cpu_to_fdt32(size & 0xffffffff);
736 dma_range += (3 + addrcell + sizecell);
739 len = dma_range - &dma_ranges[0];
741 fdt_setprop(blob, phb_off, "dma-ranges", &dma_ranges[0], len*4);
747 int fdt_increase_size(void *fdt, int add_len)
751 newlen = fdt_totalsize(fdt) + add_len;
753 /* Open in place with a new len */
754 return fdt_open_into(fdt, fdt, newlen);
757 #ifdef CONFIG_FDT_FIXUP_PARTITIONS
758 #include <jffs2/load_kernel.h>
759 #include <mtd_node.h>
761 static int fdt_del_subnodes(const void *blob, int parent_offset)
766 for (ndepth = 0, off = fdt_next_node(blob, parent_offset, &ndepth);
767 (off >= 0) && (ndepth > 0);
768 off = fdt_next_node(blob, off, &ndepth)) {
770 debug("delete %s: offset: %x\n",
771 fdt_get_name(blob, off, 0), off);
772 ret = fdt_del_node((void *)blob, off);
774 printf("Can't delete node: %s\n",
786 static int fdt_del_partitions(void *blob, int parent_offset)
793 off = fdt_next_node(blob, parent_offset, &ndepth);
794 if (off > 0 && ndepth == 1) {
795 prop = fdt_getprop(blob, off, "label", NULL);
798 * Could not find label property, nand {}; node?
799 * Check subnode, delete partitions there if any.
801 return fdt_del_partitions(blob, off);
803 ret = fdt_del_subnodes(blob, parent_offset);
805 printf("Can't remove subnodes: %s\n",
814 static int fdt_node_set_part_info(void *blob, int parent_offset,
815 struct mtd_device *dev)
817 struct list_head *pentry;
818 struct part_info *part;
824 ret = fdt_del_partitions(blob, parent_offset);
829 * Check if size/address is 1 or 2 cells.
830 * We assume #address-cells and #size-cells have same value.
832 sizecell = fdt_getprop_u32_default_node(blob, parent_offset,
833 0, "#size-cells", 1);
836 * Check if it is nand {}; subnode, adjust
837 * the offset in this case
839 off = fdt_next_node(blob, parent_offset, &ndepth);
840 if (off > 0 && ndepth == 1)
844 list_for_each_prev(pentry, &dev->parts) {
847 part = list_entry(pentry, struct part_info, link);
849 debug("%2d: %-20s0x%08llx\t0x%08llx\t%d\n",
850 part_num, part->name, part->size,
851 part->offset, part->mask_flags);
853 sprintf(buf, "partition@%llx", part->offset);
855 ret = fdt_add_subnode(blob, parent_offset, buf);
856 if (ret == -FDT_ERR_NOSPACE) {
857 ret = fdt_increase_size(blob, 512);
862 } else if (ret < 0) {
863 printf("Can't add partition node: %s\n",
869 /* Check MTD_WRITEABLE_CMD flag */
870 if (part->mask_flags & 1) {
872 ret = fdt_setprop(blob, newoff, "read_only", NULL, 0);
873 if (ret == -FDT_ERR_NOSPACE) {
874 ret = fdt_increase_size(blob, 512);
885 ret = fdt_setprop_u64(blob, newoff,
886 "reg", part->offset);
888 ret = fdt_appendprop_u64(blob, newoff,
891 ret = fdt_setprop_u32(blob, newoff,
892 "reg", part->offset);
894 ret = fdt_appendprop_u32(blob, newoff,
898 if (ret == -FDT_ERR_NOSPACE) {
899 ret = fdt_increase_size(blob, 512);
908 ret = fdt_setprop_string(blob, newoff, "label", part->name);
909 if (ret == -FDT_ERR_NOSPACE) {
910 ret = fdt_increase_size(blob, 512);
922 printf("Can't increase blob size: %s\n", fdt_strerror(ret));
925 printf("Can't add property: %s\n", fdt_strerror(ret));
930 * Update partitions in nor/nand nodes using info from
931 * mtdparts environment variable. The nodes to update are
932 * specified by node_info structure which contains mtd device
933 * type and compatible string: E. g. the board code in
934 * ft_board_setup() could use:
936 * struct node_info nodes[] = {
937 * { "fsl,mpc5121-nfc", MTD_DEV_TYPE_NAND, },
938 * { "cfi-flash", MTD_DEV_TYPE_NOR, },
941 * fdt_fixup_mtdparts(blob, nodes, ARRAY_SIZE(nodes));
943 void fdt_fixup_mtdparts(void *blob, const struct node_info *node_info,
946 struct mtd_device *dev;
951 for (i = 0; i < node_info_size; i++) {
955 while ((noff = fdt_node_offset_by_compatible(blob, noff,
956 node_info[i].compat)) >= 0) {
959 prop = fdt_getprop(blob, noff, "status", NULL);
960 if (prop && !strcmp(prop, "disabled"))
963 debug("%s: %s, mtd dev type %d\n",
964 fdt_get_name(blob, noff, 0),
965 node_info[i].compat, node_info[i].type);
968 if (mtdparts_init() != 0)
973 dev = device_find(node_info[i].type, idx++);
975 if (fdt_node_set_part_info(blob, noff, dev))
976 return; /* return on error */
983 void fdt_del_node_and_alias(void *blob, const char *alias)
985 int off = fdt_path_offset(blob, alias);
990 fdt_del_node(blob, off);
992 off = fdt_path_offset(blob, "/aliases");
993 fdt_delprop(blob, off, alias);
996 /* Max address size we deal with */
997 #define OF_MAX_ADDR_CELLS 4
998 #define OF_BAD_ADDR FDT_ADDR_T_NONE
999 #define OF_CHECK_COUNTS(na, ns) ((na) > 0 && (na) <= OF_MAX_ADDR_CELLS && \
1004 static void of_dump_addr(const char *s, const fdt32_t *addr, int na)
1008 printf(" %08x", *(addr++));
1012 static void of_dump_addr(const char *s, const fdt32_t *addr, int na) { }
1016 * struct of_bus - Callbacks for bus specific translators
1017 * @name: A string used to identify this bus in debug output.
1018 * @addresses: The name of the DT property from which addresses are
1019 * to be read, typically "reg".
1020 * @match: Return non-zero if the node whose parent is at
1021 * parentoffset in the FDT blob corresponds to a bus
1022 * of this type, otherwise return zero. If NULL a match
1024 * @count_cells:Count how many cells (be32 values) a node whose parent
1025 * is at parentoffset in the FDT blob will require to
1026 * represent its address (written to *addrc) & size
1027 * (written to *sizec).
1028 * @map: Map the address addr from the address space of this
1029 * bus to that of its parent, making use of the ranges
1030 * read from DT to an array at range. na and ns are the
1031 * number of cells (be32 values) used to hold and address
1032 * or size, respectively, for this bus. pna is the number
1033 * of cells used to hold an address for the parent bus.
1034 * Returns the address in the address space of the parent
1036 * @translate: Update the value of the address cells at addr within an
1037 * FDT by adding offset to it. na specifies the number of
1038 * cells used to hold the address being translated. Returns
1039 * zero on success, non-zero on error.
1041 * Each bus type will include a struct of_bus in the of_busses array,
1042 * providing implementations of some or all of the functions used to
1043 * match the bus & handle address translation for its children.
1047 const char *addresses;
1048 int (*match)(const void *blob, int parentoffset);
1049 void (*count_cells)(const void *blob, int parentoffset,
1050 int *addrc, int *sizec);
1051 u64 (*map)(fdt32_t *addr, const fdt32_t *range,
1052 int na, int ns, int pna);
1053 int (*translate)(fdt32_t *addr, u64 offset, int na);
1056 /* Default translator (generic bus) */
1057 void fdt_support_default_count_cells(const void *blob, int parentoffset,
1058 int *addrc, int *sizec)
1060 const fdt32_t *prop;
1063 *addrc = fdt_address_cells(blob, parentoffset);
1066 prop = fdt_getprop(blob, parentoffset, "#size-cells", NULL);
1068 *sizec = be32_to_cpup(prop);
1074 static u64 of_bus_default_map(fdt32_t *addr, const fdt32_t *range,
1075 int na, int ns, int pna)
1079 cp = fdt_read_number(range, na);
1080 s = fdt_read_number(range + na + pna, ns);
1081 da = fdt_read_number(addr, na);
1083 debug("OF: default map, cp=%llx, s=%llx, da=%llx\n", cp, s, da);
1085 if (da < cp || da >= (cp + s))
1090 static int of_bus_default_translate(fdt32_t *addr, u64 offset, int na)
1092 u64 a = fdt_read_number(addr, na);
1093 memset(addr, 0, na * 4);
1096 addr[na - 2] = cpu_to_fdt32(a >> 32);
1097 addr[na - 1] = cpu_to_fdt32(a & 0xffffffffu);
1102 #ifdef CONFIG_OF_ISA_BUS
1104 /* ISA bus translator */
1105 static int of_bus_isa_match(const void *blob, int parentoffset)
1109 name = fdt_get_name(blob, parentoffset, NULL);
1113 return !strcmp(name, "isa");
1116 static void of_bus_isa_count_cells(const void *blob, int parentoffset,
1117 int *addrc, int *sizec)
1125 static u64 of_bus_isa_map(fdt32_t *addr, const fdt32_t *range,
1126 int na, int ns, int pna)
1130 /* Check address type match */
1131 if ((addr[0] ^ range[0]) & cpu_to_be32(1))
1134 cp = fdt_read_number(range + 1, na - 1);
1135 s = fdt_read_number(range + na + pna, ns);
1136 da = fdt_read_number(addr + 1, na - 1);
1138 debug("OF: ISA map, cp=%llx, s=%llx, da=%llx\n", cp, s, da);
1140 if (da < cp || da >= (cp + s))
1145 static int of_bus_isa_translate(fdt32_t *addr, u64 offset, int na)
1147 return of_bus_default_translate(addr + 1, offset, na - 1);
1150 #endif /* CONFIG_OF_ISA_BUS */
1152 /* Array of bus specific translators */
1153 static struct of_bus of_busses[] = {
1154 #ifdef CONFIG_OF_ISA_BUS
1159 .match = of_bus_isa_match,
1160 .count_cells = of_bus_isa_count_cells,
1161 .map = of_bus_isa_map,
1162 .translate = of_bus_isa_translate,
1164 #endif /* CONFIG_OF_ISA_BUS */
1169 .count_cells = fdt_support_default_count_cells,
1170 .map = of_bus_default_map,
1171 .translate = of_bus_default_translate,
1175 static struct of_bus *of_match_bus(const void *blob, int parentoffset)
1179 if (ARRAY_SIZE(of_busses) == 1)
1182 for (bus = of_busses; bus; bus++) {
1183 if (!bus->match || bus->match(blob, parentoffset))
1188 * We should always have matched the default bus at least, since
1189 * it has a NULL match field. If we didn't then it somehow isn't
1190 * in the of_busses array or something equally catastrophic has
1197 static int of_translate_one(const void *blob, int parent, struct of_bus *bus,
1198 struct of_bus *pbus, fdt32_t *addr,
1199 int na, int ns, int pna, const char *rprop)
1201 const fdt32_t *ranges;
1204 u64 offset = OF_BAD_ADDR;
1206 /* Normally, an absence of a "ranges" property means we are
1207 * crossing a non-translatable boundary, and thus the addresses
1208 * below the current not cannot be converted to CPU physical ones.
1209 * Unfortunately, while this is very clear in the spec, it's not
1210 * what Apple understood, and they do have things like /uni-n or
1211 * /ht nodes with no "ranges" property and a lot of perfectly
1212 * useable mapped devices below them. Thus we treat the absence of
1213 * "ranges" as equivalent to an empty "ranges" property which means
1214 * a 1:1 translation at that level. It's up to the caller not to try
1215 * to translate addresses that aren't supposed to be translated in
1216 * the first place. --BenH.
1218 ranges = fdt_getprop(blob, parent, rprop, &rlen);
1219 if (ranges == NULL || rlen == 0) {
1220 offset = fdt_read_number(addr, na);
1221 memset(addr, 0, pna * 4);
1222 debug("OF: no ranges, 1:1 translation\n");
1226 debug("OF: walking ranges...\n");
1228 /* Now walk through the ranges */
1230 rone = na + pna + ns;
1231 for (; rlen >= rone; rlen -= rone, ranges += rone) {
1232 offset = bus->map(addr, ranges, na, ns, pna);
1233 if (offset != OF_BAD_ADDR)
1236 if (offset == OF_BAD_ADDR) {
1237 debug("OF: not found !\n");
1240 memcpy(addr, ranges + na, 4 * pna);
1243 of_dump_addr("OF: parent translation for:", addr, pna);
1244 debug("OF: with offset: %llu\n", offset);
1246 /* Translate it into parent bus space */
1247 return pbus->translate(addr, offset, pna);
1251 * Translate an address from the device-tree into a CPU physical address,
1252 * this walks up the tree and applies the various bus mappings on the
1255 * Note: We consider that crossing any level with #size-cells == 0 to mean
1256 * that translation is impossible (that is we are not dealing with a value
1257 * that can be mapped to a cpu physical address). This is not really specified
1258 * that way, but this is traditionally the way IBM at least do things
1260 static u64 __of_translate_address(const void *blob, int node_offset,
1261 const fdt32_t *in_addr, const char *rprop)
1264 struct of_bus *bus, *pbus;
1265 fdt32_t addr[OF_MAX_ADDR_CELLS];
1266 int na, ns, pna, pns;
1267 u64 result = OF_BAD_ADDR;
1269 debug("OF: ** translation for device %s **\n",
1270 fdt_get_name(blob, node_offset, NULL));
1272 /* Get parent & match bus type */
1273 parent = fdt_parent_offset(blob, node_offset);
1276 bus = of_match_bus(blob, parent);
1278 /* Cound address cells & copy address locally */
1279 bus->count_cells(blob, parent, &na, &ns);
1280 if (!OF_CHECK_COUNTS(na, ns)) {
1281 printf("%s: Bad cell count for %s\n", __FUNCTION__,
1282 fdt_get_name(blob, node_offset, NULL));
1285 memcpy(addr, in_addr, na * 4);
1287 debug("OF: bus is %s (na=%d, ns=%d) on %s\n",
1288 bus->name, na, ns, fdt_get_name(blob, parent, NULL));
1289 of_dump_addr("OF: translating address:", addr, na);
1293 /* Switch to parent bus */
1294 node_offset = parent;
1295 parent = fdt_parent_offset(blob, node_offset);
1297 /* If root, we have finished */
1299 debug("OF: reached root node\n");
1300 result = fdt_read_number(addr, na);
1304 /* Get new parent bus and counts */
1305 pbus = of_match_bus(blob, parent);
1306 pbus->count_cells(blob, parent, &pna, &pns);
1307 if (!OF_CHECK_COUNTS(pna, pns)) {
1308 printf("%s: Bad cell count for %s\n", __FUNCTION__,
1309 fdt_get_name(blob, node_offset, NULL));
1313 debug("OF: parent bus is %s (na=%d, ns=%d) on %s\n",
1314 pbus->name, pna, pns, fdt_get_name(blob, parent, NULL));
1316 /* Apply bus translation */
1317 if (of_translate_one(blob, node_offset, bus, pbus,
1318 addr, na, ns, pna, rprop))
1321 /* Complete the move up one level */
1326 of_dump_addr("OF: one level translation:", addr, na);
1333 u64 fdt_translate_address(const void *blob, int node_offset,
1334 const fdt32_t *in_addr)
1336 return __of_translate_address(blob, node_offset, in_addr, "ranges");
1339 u64 fdt_translate_dma_address(const void *blob, int node_offset,
1340 const fdt32_t *in_addr)
1342 return __of_translate_address(blob, node_offset, in_addr, "dma-ranges");
1346 * fdt_node_offset_by_compat_reg: Find a node that matches compatiable and
1347 * who's reg property matches a physical cpu address
1349 * @blob: ptr to device tree
1350 * @compat: compatiable string to match
1351 * @compat_off: property name
1354 int fdt_node_offset_by_compat_reg(void *blob, const char *compat,
1355 phys_addr_t compat_off)
1357 int len, off = fdt_node_offset_by_compatible(blob, -1, compat);
1358 while (off != -FDT_ERR_NOTFOUND) {
1359 const fdt32_t *reg = fdt_getprop(blob, off, "reg", &len);
1361 if (compat_off == fdt_translate_address(blob, off, reg))
1364 off = fdt_node_offset_by_compatible(blob, off, compat);
1367 return -FDT_ERR_NOTFOUND;
1371 * fdt_alloc_phandle: Return next free phandle value
1373 * @blob: ptr to device tree
1375 int fdt_alloc_phandle(void *blob)
1378 uint32_t phandle = 0;
1380 for (offset = fdt_next_node(blob, -1, NULL); offset >= 0;
1381 offset = fdt_next_node(blob, offset, NULL)) {
1382 phandle = max(phandle, fdt_get_phandle(blob, offset));
1389 * fdt_set_phandle: Create a phandle property for the given node
1391 * @fdt: ptr to device tree
1392 * @nodeoffset: node to update
1393 * @phandle: phandle value to set (must be unique)
1395 int fdt_set_phandle(void *fdt, int nodeoffset, uint32_t phandle)
1400 int off = fdt_node_offset_by_phandle(fdt, phandle);
1402 if ((off >= 0) && (off != nodeoffset)) {
1405 fdt_get_path(fdt, nodeoffset, buf, sizeof(buf));
1406 printf("Trying to update node %s with phandle %u ",
1409 fdt_get_path(fdt, off, buf, sizeof(buf));
1410 printf("that already exists in node %s.\n", buf);
1411 return -FDT_ERR_BADPHANDLE;
1415 ret = fdt_setprop_cell(fdt, nodeoffset, "phandle", phandle);
1420 * For now, also set the deprecated "linux,phandle" property, so that we
1421 * don't break older kernels.
1423 ret = fdt_setprop_cell(fdt, nodeoffset, "linux,phandle", phandle);
1429 * fdt_create_phandle: Create a phandle property for the given node
1431 * @fdt: ptr to device tree
1432 * @nodeoffset: node to update
1434 unsigned int fdt_create_phandle(void *fdt, int nodeoffset)
1436 /* see if there is a phandle already */
1437 int phandle = fdt_get_phandle(fdt, nodeoffset);
1439 /* if we got 0, means no phandle so create one */
1443 phandle = fdt_alloc_phandle(fdt);
1444 ret = fdt_set_phandle(fdt, nodeoffset, phandle);
1446 printf("Can't set phandle %u: %s\n", phandle,
1456 * fdt_set_node_status: Set status for the given node
1458 * @fdt: ptr to device tree
1459 * @nodeoffset: node to update
1460 * @status: FDT_STATUS_OKAY, FDT_STATUS_DISABLED,
1461 * FDT_STATUS_FAIL, FDT_STATUS_FAIL_ERROR_CODE
1462 * @error_code: optional, only used if status is FDT_STATUS_FAIL_ERROR_CODE
1464 int fdt_set_node_status(void *fdt, int nodeoffset,
1465 enum fdt_status status, unsigned int error_code)
1474 case FDT_STATUS_OKAY:
1475 ret = fdt_setprop_string(fdt, nodeoffset, "status", "okay");
1477 case FDT_STATUS_DISABLED:
1478 ret = fdt_setprop_string(fdt, nodeoffset, "status", "disabled");
1480 case FDT_STATUS_FAIL:
1481 ret = fdt_setprop_string(fdt, nodeoffset, "status", "fail");
1483 case FDT_STATUS_FAIL_ERROR_CODE:
1484 sprintf(buf, "fail-%d", error_code);
1485 ret = fdt_setprop_string(fdt, nodeoffset, "status", buf);
1488 printf("Invalid fdt status: %x\n", status);
1497 * fdt_set_status_by_alias: Set status for the given node given an alias
1499 * @fdt: ptr to device tree
1500 * @alias: alias of node to update
1501 * @status: FDT_STATUS_OKAY, FDT_STATUS_DISABLED,
1502 * FDT_STATUS_FAIL, FDT_STATUS_FAIL_ERROR_CODE
1503 * @error_code: optional, only used if status is FDT_STATUS_FAIL_ERROR_CODE
1505 int fdt_set_status_by_alias(void *fdt, const char* alias,
1506 enum fdt_status status, unsigned int error_code)
1508 int offset = fdt_path_offset(fdt, alias);
1510 return fdt_set_node_status(fdt, offset, status, error_code);
1513 #if defined(CONFIG_VIDEO) || defined(CONFIG_LCD)
1514 int fdt_add_edid(void *blob, const char *compat, unsigned char *edid_buf)
1519 noff = fdt_node_offset_by_compatible(blob, -1, compat);
1520 if (noff != -FDT_ERR_NOTFOUND) {
1521 debug("%s: %s\n", fdt_get_name(blob, noff, 0), compat);
1523 ret = fdt_setprop(blob, noff, "edid", edid_buf, 128);
1524 if (ret == -FDT_ERR_NOSPACE) {
1525 ret = fdt_increase_size(blob, 512);
1530 } else if (ret < 0) {
1531 printf("Can't add property: %s\n", fdt_strerror(ret));
1537 printf("Can't increase blob size: %s\n", fdt_strerror(ret));
1543 * Verify the physical address of device tree node for a given alias
1545 * This function locates the device tree node of a given alias, and then
1546 * verifies that the physical address of that device matches the given
1547 * parameter. It displays a message if there is a mismatch.
1549 * Returns 1 on success, 0 on failure
1551 int fdt_verify_alias_address(void *fdt, int anode, const char *alias, u64 addr)
1558 path = fdt_getprop(fdt, anode, alias, NULL);
1560 /* If there's no such alias, then it's not a failure */
1564 node = fdt_path_offset(fdt, path);
1566 printf("Warning: device tree alias '%s' points to invalid "
1567 "node %s.\n", alias, path);
1571 reg = fdt_getprop(fdt, node, "reg", &len);
1573 printf("Warning: device tree node '%s' has no address.\n",
1578 dt_addr = fdt_translate_address(fdt, node, reg);
1579 if (addr != dt_addr) {
1580 printf("Warning: U-Boot configured device %s at address %llu,\n"
1581 "but the device tree has it address %llx.\n",
1582 alias, addr, dt_addr);
1590 * Returns the base address of an SOC or PCI node
1592 u64 fdt_get_base_address(const void *fdt, int node)
1595 const fdt32_t *prop;
1597 prop = fdt_getprop(fdt, node, "reg", &size);
1599 return prop ? fdt_translate_address(fdt, node, prop) : OF_BAD_ADDR;
1603 * Read a property of size <prop_len>. Currently only supports 1 or 2 cells.
1605 static int fdt_read_prop(const fdt32_t *prop, int prop_len, int cell_off,
1606 uint64_t *val, int cells)
1608 const fdt32_t *prop32 = &prop[cell_off];
1609 const unaligned_fdt64_t *prop64 = (const fdt64_t *)&prop[cell_off];
1611 if ((cell_off + cells) > prop_len)
1612 return -FDT_ERR_NOSPACE;
1616 *val = fdt32_to_cpu(*prop32);
1619 *val = fdt64_to_cpu(*prop64);
1622 return -FDT_ERR_NOSPACE;
1629 * fdt_read_range - Read a node's n'th range property
1631 * @fdt: ptr to device tree
1632 * @node: offset of node
1634 * @child_addr: pointer to storage for the "child address" field
1635 * @addr: pointer to storage for the CPU view translated physical start
1636 * @len: pointer to storage for the range length
1638 * Convenience function that reads and interprets a specific range out of
1639 * a number of the "ranges" property array.
1641 int fdt_read_range(void *fdt, int node, int n, uint64_t *child_addr,
1642 uint64_t *addr, uint64_t *len)
1644 int pnode = fdt_parent_offset(fdt, node);
1645 const fdt32_t *ranges;
1654 * The "ranges" property is an array of
1655 * { <child address> <parent address> <size in child address space> }
1657 * All 3 elements can span a diffent number of cells. Fetch their size.
1659 pacells = fdt_getprop_u32_default_node(fdt, pnode, 0, "#address-cells", 1);
1660 acells = fdt_getprop_u32_default_node(fdt, node, 0, "#address-cells", 1);
1661 scells = fdt_getprop_u32_default_node(fdt, node, 0, "#size-cells", 1);
1663 /* Now try to get the ranges property */
1664 ranges = fdt_getprop(fdt, node, "ranges", &ranges_len);
1666 return -FDT_ERR_NOTFOUND;
1667 ranges_len /= sizeof(uint32_t);
1669 /* Jump to the n'th entry */
1670 cell = n * (pacells + acells + scells);
1672 /* Read <child address> */
1674 r = fdt_read_prop(ranges, ranges_len, cell, child_addr,
1681 /* Read <parent address> */
1683 *addr = fdt_translate_address(fdt, node, ranges + cell);
1686 /* Read <size in child address space> */
1688 r = fdt_read_prop(ranges, ranges_len, cell, len, scells);
1697 * fdt_setup_simplefb_node - Fill and enable a simplefb node
1699 * @fdt: ptr to device tree
1700 * @node: offset of the simplefb node
1701 * @base_address: framebuffer base address
1702 * @width: width in pixels
1703 * @height: height in pixels
1704 * @stride: bytes per line
1705 * @format: pixel format string
1707 * Convenience function to fill and enable a simplefb node.
1709 int fdt_setup_simplefb_node(void *fdt, int node, u64 base_address, u32 width,
1710 u32 height, u32 stride, const char *format)
1714 int i, addrc, sizec, ret;
1716 fdt_support_default_count_cells(fdt, fdt_parent_offset(fdt, node),
1720 cells[i++] = cpu_to_fdt32(base_address >> 32);
1721 cells[i++] = cpu_to_fdt32(base_address);
1724 cells[i++] = cpu_to_fdt32(height * stride);
1726 ret = fdt_setprop(fdt, node, "reg", cells, sizeof(cells[0]) * i);
1730 snprintf(name, sizeof(name), "framebuffer@%llx", base_address);
1731 ret = fdt_set_name(fdt, node, name);
1735 ret = fdt_setprop_u32(fdt, node, "width", width);
1739 ret = fdt_setprop_u32(fdt, node, "height", height);
1743 ret = fdt_setprop_u32(fdt, node, "stride", stride);
1747 ret = fdt_setprop_string(fdt, node, "format", format);
1751 ret = fdt_setprop_string(fdt, node, "status", "okay");
1759 * Update native-mode in display-timings from display environment variable.
1760 * The node to update are specified by path.
1762 int fdt_fixup_display(void *blob, const char *path, const char *display)
1766 if (!display || !path)
1767 return -FDT_ERR_NOTFOUND;
1769 toff = fdt_path_offset(blob, path);
1771 toff = fdt_subnode_offset(blob, toff, "display-timings");
1775 for (off = fdt_first_subnode(blob, toff);
1777 off = fdt_next_subnode(blob, off)) {
1778 uint32_t h = fdt_get_phandle(blob, off);
1779 debug("%s:0x%x\n", fdt_get_name(blob, off, NULL),
1781 if (strcasecmp(fdt_get_name(blob, off, NULL), display) == 0)
1782 return fdt_setprop_u32(blob, toff, "native-mode", h);
1787 #ifdef CONFIG_OF_LIBFDT_OVERLAY
1789 * fdt_overlay_apply_verbose - Apply an overlay with verbose error reporting
1791 * @fdt: ptr to device tree
1792 * @fdto: ptr to device tree overlay
1794 * Convenience function to apply an overlay and display helpful messages
1795 * in the case of an error
1797 int fdt_overlay_apply_verbose(void *fdt, void *fdto)
1802 err = fdt_path_offset(fdt, "/__symbols__");
1803 has_symbols = err >= 0;
1805 err = fdt_overlay_apply(fdt, fdto);
1807 printf("failed on fdt_overlay_apply(): %s\n",
1810 printf("base fdt does did not have a /__symbols__ node\n");
1811 printf("make sure you've compiled with -@\n");