1 // SPDX-License-Identifier: GPL-2.0+
4 * Gerald Van Baren, Custom IDEAS, vanbaren@cideas.com
6 * Copyright 2010-2011 Freescale Semiconductor, Inc.
13 #include <stdio_dev.h>
14 #include <linux/ctype.h>
15 #include <linux/types.h>
16 #include <asm/global_data.h>
17 #include <linux/libfdt.h>
18 #include <fdt_support.h>
23 * fdt_getprop_u32_default_node - Return a node's property or a default
25 * @fdt: ptr to device tree
26 * @off: offset of node
27 * @cell: cell offset in property
28 * @prop: property name
29 * @dflt: default value if the property isn't found
31 * Convenience function to return a node's property or a default value if
32 * the property doesn't exist.
34 u32 fdt_getprop_u32_default_node(const void *fdt, int off, int cell,
35 const char *prop, const u32 dflt)
40 val = fdt_getprop(fdt, off, prop, &len);
42 /* Check if property exists */
46 /* Check if property is long enough */
47 if (len < ((cell + 1) * sizeof(uint32_t)))
50 return fdt32_to_cpu(*val);
54 * fdt_getprop_u32_default - Find a node and return it's property or a default
56 * @fdt: ptr to device tree
58 * @prop: property name
59 * @dflt: default value if the property isn't found
61 * Convenience function to find a node and return it's property or a
62 * default value if it doesn't exist.
64 u32 fdt_getprop_u32_default(const void *fdt, const char *path,
65 const char *prop, const u32 dflt)
69 off = fdt_path_offset(fdt, path);
73 return fdt_getprop_u32_default_node(fdt, off, 0, prop, dflt);
77 * fdt_find_and_setprop: Find a node and set it's property
79 * @fdt: ptr to device tree
81 * @prop: property name
82 * @val: ptr to new value
83 * @len: length of new property value
84 * @create: flag to create the property if it doesn't exist
86 * Convenience function to directly set a property given the path to the node.
88 int fdt_find_and_setprop(void *fdt, const char *node, const char *prop,
89 const void *val, int len, int create)
91 int nodeoff = fdt_path_offset(fdt, node);
96 if ((!create) && (fdt_get_property(fdt, nodeoff, prop, NULL) == NULL))
97 return 0; /* create flag not set; so exit quietly */
99 return fdt_setprop(fdt, nodeoff, prop, val, len);
103 * fdt_find_or_add_subnode() - find or possibly add a subnode of a given node
105 * @fdt: pointer to the device tree blob
106 * @parentoffset: structure block offset of a node
107 * @name: name of the subnode to locate
109 * fdt_subnode_offset() finds a subnode of the node with a given name.
110 * If the subnode does not exist, it will be created.
112 int fdt_find_or_add_subnode(void *fdt, int parentoffset, const char *name)
116 offset = fdt_subnode_offset(fdt, parentoffset, name);
118 if (offset == -FDT_ERR_NOTFOUND)
119 offset = fdt_add_subnode(fdt, parentoffset, name);
122 printf("%s: %s: %s\n", __func__, name, fdt_strerror(offset));
127 /* rename to CONFIG_OF_STDOUT_PATH ? */
128 #if defined(OF_STDOUT_PATH)
129 static int fdt_fixup_stdout(void *fdt, int chosenoff)
131 return fdt_setprop(fdt, chosenoff, "linux,stdout-path",
132 OF_STDOUT_PATH, strlen(OF_STDOUT_PATH) + 1);
134 #elif defined(CONFIG_OF_STDOUT_VIA_ALIAS) && defined(CONFIG_CONS_INDEX)
135 static int fdt_fixup_stdout(void *fdt, int chosenoff)
139 char sername[9] = { 0 };
142 char tmp[256]; /* long enough */
144 sprintf(sername, "serial%d", CONFIG_CONS_INDEX - 1);
146 aliasoff = fdt_path_offset(fdt, "/aliases");
152 path = fdt_getprop(fdt, aliasoff, sername, &len);
158 /* fdt_setprop may break "path" so we copy it to tmp buffer */
159 memcpy(tmp, path, len);
161 err = fdt_setprop(fdt, chosenoff, "linux,stdout-path", tmp, len);
163 printf("WARNING: could not set linux,stdout-path %s.\n",
169 printf("WARNING: %s: could not read %s alias: %s\n",
170 __func__, sername, fdt_strerror(err));
175 static int fdt_fixup_stdout(void *fdt, int chosenoff)
181 static inline int fdt_setprop_uxx(void *fdt, int nodeoffset, const char *name,
182 uint64_t val, int is_u64)
185 return fdt_setprop_u64(fdt, nodeoffset, name, val);
187 return fdt_setprop_u32(fdt, nodeoffset, name, (uint32_t)val);
190 int fdt_root(void *fdt)
195 err = fdt_check_header(fdt);
197 printf("fdt_root: %s\n", fdt_strerror(err));
201 serial = env_get("serial#");
203 err = fdt_setprop(fdt, 0, "serial-number", serial,
207 printf("WARNING: could not set serial-number %s.\n",
216 int fdt_initrd(void *fdt, ulong initrd_start, ulong initrd_end)
223 /* just return if the size of initrd is zero */
224 if (initrd_start == initrd_end)
227 /* find or create "/chosen" node. */
228 nodeoffset = fdt_find_or_add_subnode(fdt, 0, "chosen");
232 total = fdt_num_mem_rsv(fdt);
235 * Look for an existing entry and update it. If we don't find
236 * the entry, we will j be the next available slot.
238 for (j = 0; j < total; j++) {
239 err = fdt_get_mem_rsv(fdt, j, &addr, &size);
240 if (addr == initrd_start) {
241 fdt_del_mem_rsv(fdt, j);
246 err = fdt_add_mem_rsv(fdt, initrd_start, initrd_end - initrd_start);
248 printf("fdt_initrd: %s\n", fdt_strerror(err));
252 is_u64 = (fdt_address_cells(fdt, 0) == 2);
254 err = fdt_setprop_uxx(fdt, nodeoffset, "linux,initrd-start",
255 (uint64_t)initrd_start, is_u64);
258 printf("WARNING: could not set linux,initrd-start %s.\n",
263 err = fdt_setprop_uxx(fdt, nodeoffset, "linux,initrd-end",
264 (uint64_t)initrd_end, is_u64);
267 printf("WARNING: could not set linux,initrd-end %s.\n",
276 int fdt_chosen(void *fdt)
280 char *str; /* used to set string properties */
282 err = fdt_check_header(fdt);
284 printf("fdt_chosen: %s\n", fdt_strerror(err));
288 /* find or create "/chosen" node. */
289 nodeoffset = fdt_find_or_add_subnode(fdt, 0, "chosen");
293 str = env_get("bootargs");
295 err = fdt_setprop(fdt, nodeoffset, "bootargs", str,
298 printf("WARNING: could not set bootargs %s.\n",
304 return fdt_fixup_stdout(fdt, nodeoffset);
307 void do_fixup_by_path(void *fdt, const char *path, const char *prop,
308 const void *val, int len, int create)
312 debug("Updating property '%s/%s' = ", path, prop);
313 for (i = 0; i < len; i++)
314 debug(" %.2x", *(u8*)(val+i));
317 int rc = fdt_find_and_setprop(fdt, path, prop, val, len, create);
319 printf("Unable to update property %s:%s, err=%s\n",
320 path, prop, fdt_strerror(rc));
323 void do_fixup_by_path_u32(void *fdt, const char *path, const char *prop,
326 fdt32_t tmp = cpu_to_fdt32(val);
327 do_fixup_by_path(fdt, path, prop, &tmp, sizeof(tmp), create);
330 void do_fixup_by_prop(void *fdt,
331 const char *pname, const void *pval, int plen,
332 const char *prop, const void *val, int len,
338 debug("Updating property '%s' = ", prop);
339 for (i = 0; i < len; i++)
340 debug(" %.2x", *(u8*)(val+i));
343 off = fdt_node_offset_by_prop_value(fdt, -1, pname, pval, plen);
344 while (off != -FDT_ERR_NOTFOUND) {
345 if (create || (fdt_get_property(fdt, off, prop, NULL) != NULL))
346 fdt_setprop(fdt, off, prop, val, len);
347 off = fdt_node_offset_by_prop_value(fdt, off, pname, pval, plen);
351 void do_fixup_by_prop_u32(void *fdt,
352 const char *pname, const void *pval, int plen,
353 const char *prop, u32 val, int create)
355 fdt32_t tmp = cpu_to_fdt32(val);
356 do_fixup_by_prop(fdt, pname, pval, plen, prop, &tmp, 4, create);
359 void do_fixup_by_compat(void *fdt, const char *compat,
360 const char *prop, const void *val, int len, int create)
365 debug("Updating property '%s' = ", prop);
366 for (i = 0; i < len; i++)
367 debug(" %.2x", *(u8*)(val+i));
370 off = fdt_node_offset_by_compatible(fdt, -1, compat);
371 while (off != -FDT_ERR_NOTFOUND) {
372 if (create || (fdt_get_property(fdt, off, prop, NULL) != NULL))
373 fdt_setprop(fdt, off, prop, val, len);
374 off = fdt_node_offset_by_compatible(fdt, off, compat);
378 void do_fixup_by_compat_u32(void *fdt, const char *compat,
379 const char *prop, u32 val, int create)
381 fdt32_t tmp = cpu_to_fdt32(val);
382 do_fixup_by_compat(fdt, compat, prop, &tmp, 4, create);
385 #ifdef CONFIG_ARCH_FIXUP_FDT_MEMORY
387 * fdt_pack_reg - pack address and size array into the "reg"-suitable stream
389 static int fdt_pack_reg(const void *fdt, void *buf, u64 *address, u64 *size,
393 int address_cells = fdt_address_cells(fdt, 0);
394 int size_cells = fdt_size_cells(fdt, 0);
397 for (i = 0; i < n; i++) {
398 if (address_cells == 2)
399 *(fdt64_t *)p = cpu_to_fdt64(address[i]);
401 *(fdt32_t *)p = cpu_to_fdt32(address[i]);
402 p += 4 * address_cells;
405 *(fdt64_t *)p = cpu_to_fdt64(size[i]);
407 *(fdt32_t *)p = cpu_to_fdt32(size[i]);
411 return p - (char *)buf;
414 #if CONFIG_NR_DRAM_BANKS > 4
415 #define MEMORY_BANKS_MAX CONFIG_NR_DRAM_BANKS
417 #define MEMORY_BANKS_MAX 4
419 int fdt_fixup_memory_banks(void *blob, u64 start[], u64 size[], int banks)
423 u8 tmp[MEMORY_BANKS_MAX * 16]; /* Up to 64-bit address + 64-bit size */
425 if (banks > MEMORY_BANKS_MAX) {
426 printf("%s: num banks %d exceeds hardcoded limit %d."
427 " Recompile with higher MEMORY_BANKS_MAX?\n",
428 __FUNCTION__, banks, MEMORY_BANKS_MAX);
432 err = fdt_check_header(blob);
434 printf("%s: %s\n", __FUNCTION__, fdt_strerror(err));
438 /* find or create "/memory" node. */
439 nodeoffset = fdt_find_or_add_subnode(blob, 0, "memory");
443 err = fdt_setprop(blob, nodeoffset, "device_type", "memory",
446 printf("WARNING: could not set %s %s.\n", "device_type",
451 for (i = 0; i < banks; i++) {
452 if (start[i] == 0 && size[i] == 0)
461 len = fdt_pack_reg(blob, tmp, start, size, banks);
463 err = fdt_setprop(blob, nodeoffset, "reg", tmp, len);
465 printf("WARNING: could not set %s %s.\n",
466 "reg", fdt_strerror(err));
472 int fdt_set_usable_memory(void *blob, u64 start[], u64 size[], int areas)
476 u8 tmp[8 * 16]; /* Up to 64-bit address + 64-bit size */
479 printf("%s: num areas %d exceeds hardcoded limit %d\n",
484 err = fdt_check_header(blob);
486 printf("%s: %s\n", __func__, fdt_strerror(err));
490 /* find or create "/memory" node. */
491 nodeoffset = fdt_find_or_add_subnode(blob, 0, "memory");
495 len = fdt_pack_reg(blob, tmp, start, size, areas);
497 err = fdt_setprop(blob, nodeoffset, "linux,usable-memory", tmp, len);
499 printf("WARNING: could not set %s %s.\n",
500 "reg", fdt_strerror(err));
508 int fdt_fixup_memory(void *blob, u64 start, u64 size)
510 return fdt_fixup_memory_banks(blob, &start, &size, 1);
513 void fdt_fixup_ethernet(void *fdt)
519 unsigned char mac_addr[ARP_HLEN];
521 #ifdef FDT_SEQ_MACADDR_FROM_ENV
523 const struct fdt_property *fdt_prop;
526 if (fdt_path_offset(fdt, "/aliases") < 0)
529 /* Cycle through all aliases */
530 for (prop = 0; ; prop++) {
533 /* FDT might have been edited, recompute the offset */
534 offset = fdt_first_property_offset(fdt,
535 fdt_path_offset(fdt, "/aliases"));
536 /* Select property number 'prop' */
537 for (j = 0; j < prop; j++)
538 offset = fdt_next_property_offset(fdt, offset);
543 path = fdt_getprop_by_offset(fdt, offset, &name, NULL);
544 if (!strncmp(name, "ethernet", 8)) {
545 /* Treat plain "ethernet" same as "ethernet0". */
546 if (!strcmp(name, "ethernet")
547 #ifdef FDT_SEQ_MACADDR_FROM_ENV
548 || !strcmp(name, "ethernet0")
552 #ifndef FDT_SEQ_MACADDR_FROM_ENV
554 i = trailing_strtol(name);
558 strcpy(mac, "ethaddr");
560 sprintf(mac, "eth%daddr", i);
564 #ifdef FDT_SEQ_MACADDR_FROM_ENV
565 nodeoff = fdt_path_offset(fdt, path);
566 fdt_prop = fdt_get_property(fdt, nodeoff, "status",
568 if (fdt_prop && !strcmp(fdt_prop->data, "disabled"))
576 for (j = 0; j < 6; j++) {
578 simple_strtoul(tmp, &end, 16) : 0;
580 tmp = (*end) ? end + 1 : end;
583 do_fixup_by_path(fdt, path, "mac-address",
585 do_fixup_by_path(fdt, path, "local-mac-address",
591 int fdt_record_loadable(void *blob, u32 index, const char *name,
592 uintptr_t load_addr, u32 size, uintptr_t entry_point,
593 const char *type, const char *os)
597 err = fdt_check_header(blob);
599 printf("%s: %s\n", __func__, fdt_strerror(err));
603 /* find or create "/fit-images" node */
604 node = fdt_find_or_add_subnode(blob, 0, "fit-images");
608 /* find or create "/fit-images/<name>" node */
609 node = fdt_find_or_add_subnode(blob, node, name);
614 * We record these as 32bit entities, possibly truncating addresses.
615 * However, spl_fit.c is not 64bit safe either: i.e. we should not
616 * have an issue here.
618 fdt_setprop_u32(blob, node, "load-addr", load_addr);
619 if (entry_point != -1)
620 fdt_setprop_u32(blob, node, "entry-point", entry_point);
621 fdt_setprop_u32(blob, node, "size", size);
623 fdt_setprop_string(blob, node, "type", type);
625 fdt_setprop_string(blob, node, "os", os);
630 /* Resize the fdt to its actual size + a bit of padding */
631 int fdt_shrink_to_minimum(void *blob, uint extrasize)
642 total = fdt_num_mem_rsv(blob);
643 for (i = 0; i < total; i++) {
644 fdt_get_mem_rsv(blob, i, &addr, &size);
645 if (addr == (uintptr_t)blob) {
646 fdt_del_mem_rsv(blob, i);
653 * Calculate the actual size of the fdt
654 * plus the size needed for 5 fdt_add_mem_rsv, one
655 * for the fdt itself and 4 for a possible initrd
656 * ((initrd-start + initrd-end) * 2 (name & value))
658 actualsize = fdt_off_dt_strings(blob) +
659 fdt_size_dt_strings(blob) + 5 * sizeof(struct fdt_reserve_entry);
661 actualsize += extrasize;
662 /* Make it so the fdt ends on a page boundary */
663 actualsize = ALIGN(actualsize + ((uintptr_t)blob & 0xfff), 0x1000);
664 actualsize = actualsize - ((uintptr_t)blob & 0xfff);
666 /* Change the fdt header to reflect the correct size */
667 fdt_set_totalsize(blob, actualsize);
670 /* Add the new reservation */
671 ret = fdt_add_mem_rsv(blob, map_to_sysmem(blob), actualsize);
680 #define CONFIG_SYS_PCI_NR_INBOUND_WIN 4
682 #define FDT_PCI_PREFETCH (0x40000000)
683 #define FDT_PCI_MEM32 (0x02000000)
684 #define FDT_PCI_IO (0x01000000)
685 #define FDT_PCI_MEM64 (0x03000000)
687 int fdt_pci_dma_ranges(void *blob, int phb_off, struct pci_controller *hose) {
689 int addrcell, sizecell, len, r;
691 /* sized based on pci addr cells, size-cells, & address-cells */
692 u32 dma_ranges[(3 + 2 + 2) * CONFIG_SYS_PCI_NR_INBOUND_WIN];
694 addrcell = fdt_getprop_u32_default(blob, "/", "#address-cells", 1);
695 sizecell = fdt_getprop_u32_default(blob, "/", "#size-cells", 1);
697 dma_range = &dma_ranges[0];
698 for (r = 0; r < hose->region_count; r++) {
699 u64 bus_start, phys_start, size;
701 /* skip if !PCI_REGION_SYS_MEMORY */
702 if (!(hose->regions[r].flags & PCI_REGION_SYS_MEMORY))
705 bus_start = (u64)hose->regions[r].bus_start;
706 phys_start = (u64)hose->regions[r].phys_start;
707 size = (u64)hose->regions[r].size;
710 if (size >= 0x100000000ull)
711 dma_range[0] |= cpu_to_fdt32(FDT_PCI_MEM64);
713 dma_range[0] |= cpu_to_fdt32(FDT_PCI_MEM32);
714 if (hose->regions[r].flags & PCI_REGION_PREFETCH)
715 dma_range[0] |= cpu_to_fdt32(FDT_PCI_PREFETCH);
716 #ifdef CONFIG_SYS_PCI_64BIT
717 dma_range[1] = cpu_to_fdt32(bus_start >> 32);
721 dma_range[2] = cpu_to_fdt32(bus_start & 0xffffffff);
724 dma_range[3] = cpu_to_fdt32(phys_start >> 32);
725 dma_range[4] = cpu_to_fdt32(phys_start & 0xffffffff);
727 dma_range[3] = cpu_to_fdt32(phys_start & 0xffffffff);
731 dma_range[3 + addrcell + 0] =
732 cpu_to_fdt32(size >> 32);
733 dma_range[3 + addrcell + 1] =
734 cpu_to_fdt32(size & 0xffffffff);
736 dma_range[3 + addrcell + 0] =
737 cpu_to_fdt32(size & 0xffffffff);
740 dma_range += (3 + addrcell + sizecell);
743 len = dma_range - &dma_ranges[0];
745 fdt_setprop(blob, phb_off, "dma-ranges", &dma_ranges[0], len*4);
751 int fdt_increase_size(void *fdt, int add_len)
755 newlen = fdt_totalsize(fdt) + add_len;
757 /* Open in place with a new len */
758 return fdt_open_into(fdt, fdt, newlen);
761 #ifdef CONFIG_FDT_FIXUP_PARTITIONS
762 #include <jffs2/load_kernel.h>
763 #include <mtd_node.h>
765 static int fdt_del_subnodes(const void *blob, int parent_offset)
770 for (ndepth = 0, off = fdt_next_node(blob, parent_offset, &ndepth);
771 (off >= 0) && (ndepth > 0);
772 off = fdt_next_node(blob, off, &ndepth)) {
774 debug("delete %s: offset: %x\n",
775 fdt_get_name(blob, off, 0), off);
776 ret = fdt_del_node((void *)blob, off);
778 printf("Can't delete node: %s\n",
790 static int fdt_del_partitions(void *blob, int parent_offset)
797 off = fdt_next_node(blob, parent_offset, &ndepth);
798 if (off > 0 && ndepth == 1) {
799 prop = fdt_getprop(blob, off, "label", NULL);
802 * Could not find label property, nand {}; node?
803 * Check subnode, delete partitions there if any.
805 return fdt_del_partitions(blob, off);
807 ret = fdt_del_subnodes(blob, parent_offset);
809 printf("Can't remove subnodes: %s\n",
818 int fdt_node_set_part_info(void *blob, int parent_offset,
819 struct mtd_device *dev)
821 struct list_head *pentry;
822 struct part_info *part;
828 ret = fdt_del_partitions(blob, parent_offset);
833 * Check if size/address is 1 or 2 cells.
834 * We assume #address-cells and #size-cells have same value.
836 sizecell = fdt_getprop_u32_default_node(blob, parent_offset,
837 0, "#size-cells", 1);
840 * Check if it is nand {}; subnode, adjust
841 * the offset in this case
843 off = fdt_next_node(blob, parent_offset, &ndepth);
844 if (off > 0 && ndepth == 1)
848 list_for_each_prev(pentry, &dev->parts) {
851 part = list_entry(pentry, struct part_info, link);
853 debug("%2d: %-20s0x%08llx\t0x%08llx\t%d\n",
854 part_num, part->name, part->size,
855 part->offset, part->mask_flags);
857 sprintf(buf, "partition@%llx", part->offset);
859 ret = fdt_add_subnode(blob, parent_offset, buf);
860 if (ret == -FDT_ERR_NOSPACE) {
861 ret = fdt_increase_size(blob, 512);
866 } else if (ret < 0) {
867 printf("Can't add partition node: %s\n",
873 /* Check MTD_WRITEABLE_CMD flag */
874 if (part->mask_flags & 1) {
876 ret = fdt_setprop(blob, newoff, "read_only", NULL, 0);
877 if (ret == -FDT_ERR_NOSPACE) {
878 ret = fdt_increase_size(blob, 512);
889 ret = fdt_setprop_u64(blob, newoff,
890 "reg", part->offset);
892 ret = fdt_appendprop_u64(blob, newoff,
895 ret = fdt_setprop_u32(blob, newoff,
896 "reg", part->offset);
898 ret = fdt_appendprop_u32(blob, newoff,
902 if (ret == -FDT_ERR_NOSPACE) {
903 ret = fdt_increase_size(blob, 512);
912 ret = fdt_setprop_string(blob, newoff, "label", part->name);
913 if (ret == -FDT_ERR_NOSPACE) {
914 ret = fdt_increase_size(blob, 512);
926 printf("Can't increase blob size: %s\n", fdt_strerror(ret));
929 printf("Can't add property: %s\n", fdt_strerror(ret));
934 * Update partitions in nor/nand nodes using info from
935 * mtdparts environment variable. The nodes to update are
936 * specified by node_info structure which contains mtd device
937 * type and compatible string: E. g. the board code in
938 * ft_board_setup() could use:
940 * struct node_info nodes[] = {
941 * { "fsl,mpc5121-nfc", MTD_DEV_TYPE_NAND, },
942 * { "cfi-flash", MTD_DEV_TYPE_NOR, },
945 * fdt_fixup_mtdparts(blob, nodes, ARRAY_SIZE(nodes));
947 void fdt_fixup_mtdparts(void *blob, const struct node_info *node_info,
950 struct mtd_device *dev;
954 if (mtdparts_init() != 0)
957 for (i = 0; i < node_info_size; i++) {
959 noff = fdt_node_offset_by_compatible(blob, -1,
960 node_info[i].compat);
961 while (noff != -FDT_ERR_NOTFOUND) {
962 debug("%s: %s, mtd dev type %d\n",
963 fdt_get_name(blob, noff, 0),
964 node_info[i].compat, node_info[i].type);
965 dev = device_find(node_info[i].type, idx++);
967 if (fdt_node_set_part_info(blob, noff, dev))
968 return; /* return on error */
971 /* Jump to next flash node */
972 noff = fdt_node_offset_by_compatible(blob, noff,
973 node_info[i].compat);
979 void fdt_del_node_and_alias(void *blob, const char *alias)
981 int off = fdt_path_offset(blob, alias);
986 fdt_del_node(blob, off);
988 off = fdt_path_offset(blob, "/aliases");
989 fdt_delprop(blob, off, alias);
992 /* Max address size we deal with */
993 #define OF_MAX_ADDR_CELLS 4
994 #define OF_BAD_ADDR FDT_ADDR_T_NONE
995 #define OF_CHECK_COUNTS(na, ns) ((na) > 0 && (na) <= OF_MAX_ADDR_CELLS && \
1000 static void of_dump_addr(const char *s, const fdt32_t *addr, int na)
1004 printf(" %08x", *(addr++));
1008 static void of_dump_addr(const char *s, const fdt32_t *addr, int na) { }
1012 * struct of_bus - Callbacks for bus specific translators
1013 * @name: A string used to identify this bus in debug output.
1014 * @addresses: The name of the DT property from which addresses are
1015 * to be read, typically "reg".
1016 * @match: Return non-zero if the node whose parent is at
1017 * parentoffset in the FDT blob corresponds to a bus
1018 * of this type, otherwise return zero. If NULL a match
1020 * @count_cells:Count how many cells (be32 values) a node whose parent
1021 * is at parentoffset in the FDT blob will require to
1022 * represent its address (written to *addrc) & size
1023 * (written to *sizec).
1024 * @map: Map the address addr from the address space of this
1025 * bus to that of its parent, making use of the ranges
1026 * read from DT to an array at range. na and ns are the
1027 * number of cells (be32 values) used to hold and address
1028 * or size, respectively, for this bus. pna is the number
1029 * of cells used to hold an address for the parent bus.
1030 * Returns the address in the address space of the parent
1032 * @translate: Update the value of the address cells at addr within an
1033 * FDT by adding offset to it. na specifies the number of
1034 * cells used to hold the address being translated. Returns
1035 * zero on success, non-zero on error.
1037 * Each bus type will include a struct of_bus in the of_busses array,
1038 * providing implementations of some or all of the functions used to
1039 * match the bus & handle address translation for its children.
1043 const char *addresses;
1044 int (*match)(const void *blob, int parentoffset);
1045 void (*count_cells)(const void *blob, int parentoffset,
1046 int *addrc, int *sizec);
1047 u64 (*map)(fdt32_t *addr, const fdt32_t *range,
1048 int na, int ns, int pna);
1049 int (*translate)(fdt32_t *addr, u64 offset, int na);
1052 /* Default translator (generic bus) */
1053 void fdt_support_default_count_cells(const void *blob, int parentoffset,
1054 int *addrc, int *sizec)
1056 const fdt32_t *prop;
1059 *addrc = fdt_address_cells(blob, parentoffset);
1062 prop = fdt_getprop(blob, parentoffset, "#size-cells", NULL);
1064 *sizec = be32_to_cpup(prop);
1070 static u64 of_bus_default_map(fdt32_t *addr, const fdt32_t *range,
1071 int na, int ns, int pna)
1075 cp = fdt_read_number(range, na);
1076 s = fdt_read_number(range + na + pna, ns);
1077 da = fdt_read_number(addr, na);
1079 debug("OF: default map, cp=%llx, s=%llx, da=%llx\n", cp, s, da);
1081 if (da < cp || da >= (cp + s))
1086 static int of_bus_default_translate(fdt32_t *addr, u64 offset, int na)
1088 u64 a = fdt_read_number(addr, na);
1089 memset(addr, 0, na * 4);
1092 addr[na - 2] = cpu_to_fdt32(a >> 32);
1093 addr[na - 1] = cpu_to_fdt32(a & 0xffffffffu);
1098 #ifdef CONFIG_OF_ISA_BUS
1100 /* ISA bus translator */
1101 static int of_bus_isa_match(const void *blob, int parentoffset)
1105 name = fdt_get_name(blob, parentoffset, NULL);
1109 return !strcmp(name, "isa");
1112 static void of_bus_isa_count_cells(const void *blob, int parentoffset,
1113 int *addrc, int *sizec)
1121 static u64 of_bus_isa_map(fdt32_t *addr, const fdt32_t *range,
1122 int na, int ns, int pna)
1126 /* Check address type match */
1127 if ((addr[0] ^ range[0]) & cpu_to_be32(1))
1130 cp = fdt_read_number(range + 1, na - 1);
1131 s = fdt_read_number(range + na + pna, ns);
1132 da = fdt_read_number(addr + 1, na - 1);
1134 debug("OF: ISA map, cp=%llx, s=%llx, da=%llx\n", cp, s, da);
1136 if (da < cp || da >= (cp + s))
1141 static int of_bus_isa_translate(fdt32_t *addr, u64 offset, int na)
1143 return of_bus_default_translate(addr + 1, offset, na - 1);
1146 #endif /* CONFIG_OF_ISA_BUS */
1148 /* Array of bus specific translators */
1149 static struct of_bus of_busses[] = {
1150 #ifdef CONFIG_OF_ISA_BUS
1155 .match = of_bus_isa_match,
1156 .count_cells = of_bus_isa_count_cells,
1157 .map = of_bus_isa_map,
1158 .translate = of_bus_isa_translate,
1160 #endif /* CONFIG_OF_ISA_BUS */
1165 .count_cells = fdt_support_default_count_cells,
1166 .map = of_bus_default_map,
1167 .translate = of_bus_default_translate,
1171 static struct of_bus *of_match_bus(const void *blob, int parentoffset)
1175 if (ARRAY_SIZE(of_busses) == 1)
1178 for (bus = of_busses; bus; bus++) {
1179 if (!bus->match || bus->match(blob, parentoffset))
1184 * We should always have matched the default bus at least, since
1185 * it has a NULL match field. If we didn't then it somehow isn't
1186 * in the of_busses array or something equally catastrophic has
1193 static int of_translate_one(const void *blob, int parent, struct of_bus *bus,
1194 struct of_bus *pbus, fdt32_t *addr,
1195 int na, int ns, int pna, const char *rprop)
1197 const fdt32_t *ranges;
1200 u64 offset = OF_BAD_ADDR;
1202 /* Normally, an absence of a "ranges" property means we are
1203 * crossing a non-translatable boundary, and thus the addresses
1204 * below the current not cannot be converted to CPU physical ones.
1205 * Unfortunately, while this is very clear in the spec, it's not
1206 * what Apple understood, and they do have things like /uni-n or
1207 * /ht nodes with no "ranges" property and a lot of perfectly
1208 * useable mapped devices below them. Thus we treat the absence of
1209 * "ranges" as equivalent to an empty "ranges" property which means
1210 * a 1:1 translation at that level. It's up to the caller not to try
1211 * to translate addresses that aren't supposed to be translated in
1212 * the first place. --BenH.
1214 ranges = fdt_getprop(blob, parent, rprop, &rlen);
1215 if (ranges == NULL || rlen == 0) {
1216 offset = fdt_read_number(addr, na);
1217 memset(addr, 0, pna * 4);
1218 debug("OF: no ranges, 1:1 translation\n");
1222 debug("OF: walking ranges...\n");
1224 /* Now walk through the ranges */
1226 rone = na + pna + ns;
1227 for (; rlen >= rone; rlen -= rone, ranges += rone) {
1228 offset = bus->map(addr, ranges, na, ns, pna);
1229 if (offset != OF_BAD_ADDR)
1232 if (offset == OF_BAD_ADDR) {
1233 debug("OF: not found !\n");
1236 memcpy(addr, ranges + na, 4 * pna);
1239 of_dump_addr("OF: parent translation for:", addr, pna);
1240 debug("OF: with offset: %llu\n", offset);
1242 /* Translate it into parent bus space */
1243 return pbus->translate(addr, offset, pna);
1247 * Translate an address from the device-tree into a CPU physical address,
1248 * this walks up the tree and applies the various bus mappings on the
1251 * Note: We consider that crossing any level with #size-cells == 0 to mean
1252 * that translation is impossible (that is we are not dealing with a value
1253 * that can be mapped to a cpu physical address). This is not really specified
1254 * that way, but this is traditionally the way IBM at least do things
1256 static u64 __of_translate_address(const void *blob, int node_offset,
1257 const fdt32_t *in_addr, const char *rprop)
1260 struct of_bus *bus, *pbus;
1261 fdt32_t addr[OF_MAX_ADDR_CELLS];
1262 int na, ns, pna, pns;
1263 u64 result = OF_BAD_ADDR;
1265 debug("OF: ** translation for device %s **\n",
1266 fdt_get_name(blob, node_offset, NULL));
1268 /* Get parent & match bus type */
1269 parent = fdt_parent_offset(blob, node_offset);
1272 bus = of_match_bus(blob, parent);
1274 /* Cound address cells & copy address locally */
1275 bus->count_cells(blob, parent, &na, &ns);
1276 if (!OF_CHECK_COUNTS(na, ns)) {
1277 printf("%s: Bad cell count for %s\n", __FUNCTION__,
1278 fdt_get_name(blob, node_offset, NULL));
1281 memcpy(addr, in_addr, na * 4);
1283 debug("OF: bus is %s (na=%d, ns=%d) on %s\n",
1284 bus->name, na, ns, fdt_get_name(blob, parent, NULL));
1285 of_dump_addr("OF: translating address:", addr, na);
1289 /* Switch to parent bus */
1290 node_offset = parent;
1291 parent = fdt_parent_offset(blob, node_offset);
1293 /* If root, we have finished */
1295 debug("OF: reached root node\n");
1296 result = fdt_read_number(addr, na);
1300 /* Get new parent bus and counts */
1301 pbus = of_match_bus(blob, parent);
1302 pbus->count_cells(blob, parent, &pna, &pns);
1303 if (!OF_CHECK_COUNTS(pna, pns)) {
1304 printf("%s: Bad cell count for %s\n", __FUNCTION__,
1305 fdt_get_name(blob, node_offset, NULL));
1309 debug("OF: parent bus is %s (na=%d, ns=%d) on %s\n",
1310 pbus->name, pna, pns, fdt_get_name(blob, parent, NULL));
1312 /* Apply bus translation */
1313 if (of_translate_one(blob, node_offset, bus, pbus,
1314 addr, na, ns, pna, rprop))
1317 /* Complete the move up one level */
1322 of_dump_addr("OF: one level translation:", addr, na);
1329 u64 fdt_translate_address(const void *blob, int node_offset,
1330 const fdt32_t *in_addr)
1332 return __of_translate_address(blob, node_offset, in_addr, "ranges");
1335 u64 fdt_translate_dma_address(const void *blob, int node_offset,
1336 const fdt32_t *in_addr)
1338 return __of_translate_address(blob, node_offset, in_addr, "dma-ranges");
1342 * fdt_node_offset_by_compat_reg: Find a node that matches compatiable and
1343 * who's reg property matches a physical cpu address
1345 * @blob: ptr to device tree
1346 * @compat: compatiable string to match
1347 * @compat_off: property name
1350 int fdt_node_offset_by_compat_reg(void *blob, const char *compat,
1351 phys_addr_t compat_off)
1353 int len, off = fdt_node_offset_by_compatible(blob, -1, compat);
1354 while (off != -FDT_ERR_NOTFOUND) {
1355 const fdt32_t *reg = fdt_getprop(blob, off, "reg", &len);
1357 if (compat_off == fdt_translate_address(blob, off, reg))
1360 off = fdt_node_offset_by_compatible(blob, off, compat);
1363 return -FDT_ERR_NOTFOUND;
1367 * fdt_alloc_phandle: Return next free phandle value
1369 * @blob: ptr to device tree
1371 int fdt_alloc_phandle(void *blob)
1374 uint32_t phandle = 0;
1376 for (offset = fdt_next_node(blob, -1, NULL); offset >= 0;
1377 offset = fdt_next_node(blob, offset, NULL)) {
1378 phandle = max(phandle, fdt_get_phandle(blob, offset));
1385 * fdt_set_phandle: Create a phandle property for the given node
1387 * @fdt: ptr to device tree
1388 * @nodeoffset: node to update
1389 * @phandle: phandle value to set (must be unique)
1391 int fdt_set_phandle(void *fdt, int nodeoffset, uint32_t phandle)
1396 int off = fdt_node_offset_by_phandle(fdt, phandle);
1398 if ((off >= 0) && (off != nodeoffset)) {
1401 fdt_get_path(fdt, nodeoffset, buf, sizeof(buf));
1402 printf("Trying to update node %s with phandle %u ",
1405 fdt_get_path(fdt, off, buf, sizeof(buf));
1406 printf("that already exists in node %s.\n", buf);
1407 return -FDT_ERR_BADPHANDLE;
1411 ret = fdt_setprop_cell(fdt, nodeoffset, "phandle", phandle);
1416 * For now, also set the deprecated "linux,phandle" property, so that we
1417 * don't break older kernels.
1419 ret = fdt_setprop_cell(fdt, nodeoffset, "linux,phandle", phandle);
1425 * fdt_create_phandle: Create a phandle property for the given node
1427 * @fdt: ptr to device tree
1428 * @nodeoffset: node to update
1430 unsigned int fdt_create_phandle(void *fdt, int nodeoffset)
1432 /* see if there is a phandle already */
1433 int phandle = fdt_get_phandle(fdt, nodeoffset);
1435 /* if we got 0, means no phandle so create one */
1439 phandle = fdt_alloc_phandle(fdt);
1440 ret = fdt_set_phandle(fdt, nodeoffset, phandle);
1442 printf("Can't set phandle %u: %s\n", phandle,
1452 * fdt_set_node_status: Set status for the given node
1454 * @fdt: ptr to device tree
1455 * @nodeoffset: node to update
1456 * @status: FDT_STATUS_OKAY, FDT_STATUS_DISABLED,
1457 * FDT_STATUS_FAIL, FDT_STATUS_FAIL_ERROR_CODE
1458 * @error_code: optional, only used if status is FDT_STATUS_FAIL_ERROR_CODE
1460 int fdt_set_node_status(void *fdt, int nodeoffset,
1461 enum fdt_status status, unsigned int error_code)
1470 case FDT_STATUS_OKAY:
1471 ret = fdt_setprop_string(fdt, nodeoffset, "status", "okay");
1473 case FDT_STATUS_DISABLED:
1474 ret = fdt_setprop_string(fdt, nodeoffset, "status", "disabled");
1476 case FDT_STATUS_FAIL:
1477 ret = fdt_setprop_string(fdt, nodeoffset, "status", "fail");
1479 case FDT_STATUS_FAIL_ERROR_CODE:
1480 sprintf(buf, "fail-%d", error_code);
1481 ret = fdt_setprop_string(fdt, nodeoffset, "status", buf);
1484 printf("Invalid fdt status: %x\n", status);
1493 * fdt_set_status_by_alias: Set status for the given node given an alias
1495 * @fdt: ptr to device tree
1496 * @alias: alias of node to update
1497 * @status: FDT_STATUS_OKAY, FDT_STATUS_DISABLED,
1498 * FDT_STATUS_FAIL, FDT_STATUS_FAIL_ERROR_CODE
1499 * @error_code: optional, only used if status is FDT_STATUS_FAIL_ERROR_CODE
1501 int fdt_set_status_by_alias(void *fdt, const char* alias,
1502 enum fdt_status status, unsigned int error_code)
1504 int offset = fdt_path_offset(fdt, alias);
1506 return fdt_set_node_status(fdt, offset, status, error_code);
1509 #if defined(CONFIG_VIDEO) || defined(CONFIG_LCD)
1510 int fdt_add_edid(void *blob, const char *compat, unsigned char *edid_buf)
1515 noff = fdt_node_offset_by_compatible(blob, -1, compat);
1516 if (noff != -FDT_ERR_NOTFOUND) {
1517 debug("%s: %s\n", fdt_get_name(blob, noff, 0), compat);
1519 ret = fdt_setprop(blob, noff, "edid", edid_buf, 128);
1520 if (ret == -FDT_ERR_NOSPACE) {
1521 ret = fdt_increase_size(blob, 512);
1526 } else if (ret < 0) {
1527 printf("Can't add property: %s\n", fdt_strerror(ret));
1533 printf("Can't increase blob size: %s\n", fdt_strerror(ret));
1539 * Verify the physical address of device tree node for a given alias
1541 * This function locates the device tree node of a given alias, and then
1542 * verifies that the physical address of that device matches the given
1543 * parameter. It displays a message if there is a mismatch.
1545 * Returns 1 on success, 0 on failure
1547 int fdt_verify_alias_address(void *fdt, int anode, const char *alias, u64 addr)
1554 path = fdt_getprop(fdt, anode, alias, NULL);
1556 /* If there's no such alias, then it's not a failure */
1560 node = fdt_path_offset(fdt, path);
1562 printf("Warning: device tree alias '%s' points to invalid "
1563 "node %s.\n", alias, path);
1567 reg = fdt_getprop(fdt, node, "reg", &len);
1569 printf("Warning: device tree node '%s' has no address.\n",
1574 dt_addr = fdt_translate_address(fdt, node, reg);
1575 if (addr != dt_addr) {
1576 printf("Warning: U-Boot configured device %s at address %llu,\n"
1577 "but the device tree has it address %llx.\n",
1578 alias, addr, dt_addr);
1586 * Returns the base address of an SOC or PCI node
1588 u64 fdt_get_base_address(const void *fdt, int node)
1591 const fdt32_t *prop;
1593 prop = fdt_getprop(fdt, node, "reg", &size);
1595 return prop ? fdt_translate_address(fdt, node, prop) : OF_BAD_ADDR;
1599 * Read a property of size <prop_len>. Currently only supports 1 or 2 cells.
1601 static int fdt_read_prop(const fdt32_t *prop, int prop_len, int cell_off,
1602 uint64_t *val, int cells)
1604 const fdt32_t *prop32 = &prop[cell_off];
1605 const unaligned_fdt64_t *prop64 = (const fdt64_t *)&prop[cell_off];
1607 if ((cell_off + cells) > prop_len)
1608 return -FDT_ERR_NOSPACE;
1612 *val = fdt32_to_cpu(*prop32);
1615 *val = fdt64_to_cpu(*prop64);
1618 return -FDT_ERR_NOSPACE;
1625 * fdt_read_range - Read a node's n'th range property
1627 * @fdt: ptr to device tree
1628 * @node: offset of node
1630 * @child_addr: pointer to storage for the "child address" field
1631 * @addr: pointer to storage for the CPU view translated physical start
1632 * @len: pointer to storage for the range length
1634 * Convenience function that reads and interprets a specific range out of
1635 * a number of the "ranges" property array.
1637 int fdt_read_range(void *fdt, int node, int n, uint64_t *child_addr,
1638 uint64_t *addr, uint64_t *len)
1640 int pnode = fdt_parent_offset(fdt, node);
1641 const fdt32_t *ranges;
1650 * The "ranges" property is an array of
1651 * { <child address> <parent address> <size in child address space> }
1653 * All 3 elements can span a diffent number of cells. Fetch their size.
1655 pacells = fdt_getprop_u32_default_node(fdt, pnode, 0, "#address-cells", 1);
1656 acells = fdt_getprop_u32_default_node(fdt, node, 0, "#address-cells", 1);
1657 scells = fdt_getprop_u32_default_node(fdt, node, 0, "#size-cells", 1);
1659 /* Now try to get the ranges property */
1660 ranges = fdt_getprop(fdt, node, "ranges", &ranges_len);
1662 return -FDT_ERR_NOTFOUND;
1663 ranges_len /= sizeof(uint32_t);
1665 /* Jump to the n'th entry */
1666 cell = n * (pacells + acells + scells);
1668 /* Read <child address> */
1670 r = fdt_read_prop(ranges, ranges_len, cell, child_addr,
1677 /* Read <parent address> */
1679 *addr = fdt_translate_address(fdt, node, ranges + cell);
1682 /* Read <size in child address space> */
1684 r = fdt_read_prop(ranges, ranges_len, cell, len, scells);
1693 * fdt_setup_simplefb_node - Fill and enable a simplefb node
1695 * @fdt: ptr to device tree
1696 * @node: offset of the simplefb node
1697 * @base_address: framebuffer base address
1698 * @width: width in pixels
1699 * @height: height in pixels
1700 * @stride: bytes per line
1701 * @format: pixel format string
1703 * Convenience function to fill and enable a simplefb node.
1705 int fdt_setup_simplefb_node(void *fdt, int node, u64 base_address, u32 width,
1706 u32 height, u32 stride, const char *format)
1710 int i, addrc, sizec, ret;
1712 fdt_support_default_count_cells(fdt, fdt_parent_offset(fdt, node),
1716 cells[i++] = cpu_to_fdt32(base_address >> 32);
1717 cells[i++] = cpu_to_fdt32(base_address);
1720 cells[i++] = cpu_to_fdt32(height * stride);
1722 ret = fdt_setprop(fdt, node, "reg", cells, sizeof(cells[0]) * i);
1726 snprintf(name, sizeof(name), "framebuffer@%llx", base_address);
1727 ret = fdt_set_name(fdt, node, name);
1731 ret = fdt_setprop_u32(fdt, node, "width", width);
1735 ret = fdt_setprop_u32(fdt, node, "height", height);
1739 ret = fdt_setprop_u32(fdt, node, "stride", stride);
1743 ret = fdt_setprop_string(fdt, node, "format", format);
1747 ret = fdt_setprop_string(fdt, node, "status", "okay");
1755 * Update native-mode in display-timings from display environment variable.
1756 * The node to update are specified by path.
1758 int fdt_fixup_display(void *blob, const char *path, const char *display)
1762 if (!display || !path)
1763 return -FDT_ERR_NOTFOUND;
1765 toff = fdt_path_offset(blob, path);
1767 toff = fdt_subnode_offset(blob, toff, "display-timings");
1771 for (off = fdt_first_subnode(blob, toff);
1773 off = fdt_next_subnode(blob, off)) {
1774 uint32_t h = fdt_get_phandle(blob, off);
1775 debug("%s:0x%x\n", fdt_get_name(blob, off, NULL),
1777 if (strcasecmp(fdt_get_name(blob, off, NULL), display) == 0)
1778 return fdt_setprop_u32(blob, toff, "native-mode", h);
1783 #ifdef CONFIG_OF_LIBFDT_OVERLAY
1785 * fdt_overlay_apply_verbose - Apply an overlay with verbose error reporting
1787 * @fdt: ptr to device tree
1788 * @fdto: ptr to device tree overlay
1790 * Convenience function to apply an overlay and display helpful messages
1791 * in the case of an error
1793 int fdt_overlay_apply_verbose(void *fdt, void *fdto)
1798 err = fdt_path_offset(fdt, "/__symbols__");
1799 has_symbols = err >= 0;
1801 err = fdt_overlay_apply(fdt, fdto);
1803 printf("failed on fdt_overlay_apply(): %s\n",
1806 printf("base fdt does did not have a /__symbols__ node\n");
1807 printf("make sure you've compiled with -@\n");