3 * Gerald Van Baren, Custom IDEAS, vanbaren@cideas.com
5 * Copyright 2010-2011 Freescale Semiconductor, Inc.
7 * SPDX-License-Identifier: GPL-2.0+
11 #include <stdio_dev.h>
12 #include <linux/ctype.h>
13 #include <linux/types.h>
14 #include <asm/global_data.h>
16 #include <fdt_support.h>
20 * Get cells len in bytes
21 * if #NNNN-cells property is 2 then len is 8
24 static int get_cells_len(void *blob, char *nr_cells_name)
28 cell = fdt_getprop(blob, 0, nr_cells_name, NULL);
29 if (cell && fdt32_to_cpu(*cell) == 2)
36 * Write a 4 or 8 byte big endian cell
38 static void write_cell(u8 *addr, u64 val, int size)
40 int shift = (size - 1) * 8;
42 *addr++ = (val >> shift) & 0xff;
48 * fdt_getprop_u32_default_node - Return a node's property or a default
50 * @fdt: ptr to device tree
51 * @off: offset of node
52 * @cell: cell offset in property
53 * @prop: property name
54 * @dflt: default value if the property isn't found
56 * Convenience function to return a node's property or a default value if
57 * the property doesn't exist.
59 u32 fdt_getprop_u32_default_node(const void *fdt, int off, int cell,
60 const char *prop, const u32 dflt)
65 val = fdt_getprop(fdt, off, prop, &len);
67 /* Check if property exists */
71 /* Check if property is long enough */
72 if (len < ((cell + 1) * sizeof(uint32_t)))
75 return fdt32_to_cpu(*val);
79 * fdt_getprop_u32_default - Find a node and return it's property or a default
81 * @fdt: ptr to device tree
83 * @prop: property name
84 * @dflt: default value if the property isn't found
86 * Convenience function to find a node and return it's property or a
87 * default value if it doesn't exist.
89 u32 fdt_getprop_u32_default(const void *fdt, const char *path,
90 const char *prop, const u32 dflt)
94 off = fdt_path_offset(fdt, path);
98 return fdt_getprop_u32_default_node(fdt, off, 0, prop, dflt);
102 * fdt_find_and_setprop: Find a node and set it's property
104 * @fdt: ptr to device tree
105 * @node: path of node
106 * @prop: property name
107 * @val: ptr to new value
108 * @len: length of new property value
109 * @create: flag to create the property if it doesn't exist
111 * Convenience function to directly set a property given the path to the node.
113 int fdt_find_and_setprop(void *fdt, const char *node, const char *prop,
114 const void *val, int len, int create)
116 int nodeoff = fdt_path_offset(fdt, node);
121 if ((!create) && (fdt_get_property(fdt, nodeoff, prop, NULL) == NULL))
122 return 0; /* create flag not set; so exit quietly */
124 return fdt_setprop(fdt, nodeoff, prop, val, len);
128 * fdt_find_or_add_subnode - find or possibly add a subnode of a given node
129 * @fdt: pointer to the device tree blob
130 * @parentoffset: structure block offset of a node
131 * @name: name of the subnode to locate
133 * fdt_subnode_offset() finds a subnode of the node with a given name.
134 * If the subnode does not exist, it will be created.
136 static int fdt_find_or_add_subnode(void *fdt, int parentoffset,
141 offset = fdt_subnode_offset(fdt, parentoffset, name);
143 if (offset == -FDT_ERR_NOTFOUND)
144 offset = fdt_add_subnode(fdt, parentoffset, name);
147 printf("%s: %s: %s\n", __func__, name, fdt_strerror(offset));
152 #ifdef CONFIG_OF_STDOUT_VIA_ALIAS
154 #ifdef CONFIG_CONS_INDEX
155 static void fdt_fill_multisername(char *sername, size_t maxlen)
157 const char *outname = stdio_devices[stdout]->name;
159 if (strcmp(outname, "serial") > 0)
160 strncpy(sername, outname, maxlen);
163 if (strcmp(outname + 1, "serial") > 0)
164 strncpy(sername, outname + 1, maxlen);
168 static int fdt_fixup_stdout(void *fdt, int chosenoff)
171 #ifdef CONFIG_CONS_INDEX
173 char sername[9] = { 0 };
176 fdt_fill_multisername(sername, sizeof(sername) - 1);
178 sprintf(sername, "serial%d", CONFIG_CONS_INDEX - 1);
180 err = node = fdt_path_offset(fdt, "/aliases");
183 path = fdt_getprop(fdt, node, sername, &len);
185 char *p = malloc(len);
186 err = -FDT_ERR_NOSPACE;
188 memcpy(p, path, len);
189 err = fdt_setprop(fdt, chosenoff,
190 "linux,stdout-path", p, len);
199 printf("WARNING: could not set linux,stdout-path %s.\n",
206 int fdt_initrd(void *fdt, ulong initrd_start, ulong initrd_end)
208 int nodeoffset, addr_cell_len;
213 /* find or create "/chosen" node. */
214 nodeoffset = fdt_find_or_add_subnode(fdt, 0, "chosen");
218 /* just return if initrd_start/end aren't valid */
219 if ((initrd_start == 0) || (initrd_end == 0))
222 total = fdt_num_mem_rsv(fdt);
225 * Look for an existing entry and update it. If we don't find
226 * the entry, we will j be the next available slot.
228 for (j = 0; j < total; j++) {
229 err = fdt_get_mem_rsv(fdt, j, &addr, &size);
230 if (addr == initrd_start) {
231 fdt_del_mem_rsv(fdt, j);
236 err = fdt_add_mem_rsv(fdt, initrd_start, initrd_end - initrd_start);
238 printf("fdt_initrd: %s\n", fdt_strerror(err));
242 addr_cell_len = get_cells_len(fdt, "#address-cells");
244 write_cell((u8 *)&tmp, initrd_start, addr_cell_len);
245 err = fdt_setprop(fdt, nodeoffset,
246 "linux,initrd-start", &tmp, addr_cell_len);
248 printf("WARNING: could not set linux,initrd-start %s.\n",
252 write_cell((u8 *)&tmp, initrd_end, addr_cell_len);
253 err = fdt_setprop(fdt, nodeoffset,
254 "linux,initrd-end", &tmp, addr_cell_len);
256 printf("WARNING: could not set linux,initrd-end %s.\n",
265 int fdt_chosen(void *fdt, int force)
269 char *str; /* used to set string properties */
272 err = fdt_check_header(fdt);
274 printf("fdt_chosen: %s\n", fdt_strerror(err));
278 /* find or create "/chosen" node. */
279 nodeoffset = fdt_find_or_add_subnode(fdt, 0, "chosen");
284 * Create /chosen properites that don't exist in the fdt.
285 * If the property exists, update it only if the "force" parameter
288 str = getenv("bootargs");
290 path = fdt_getprop(fdt, nodeoffset, "bootargs", NULL);
291 if ((path == NULL) || force) {
292 err = fdt_setprop(fdt, nodeoffset,
293 "bootargs", str, strlen(str)+1);
295 printf("WARNING: could not set bootargs %s.\n",
300 #ifdef CONFIG_OF_STDOUT_VIA_ALIAS
301 path = fdt_getprop(fdt, nodeoffset, "linux,stdout-path", NULL);
302 if ((path == NULL) || force)
303 err = fdt_fixup_stdout(fdt, nodeoffset);
306 #ifdef OF_STDOUT_PATH
307 path = fdt_getprop(fdt, nodeoffset, "linux,stdout-path", NULL);
308 if ((path == NULL) || force) {
309 err = fdt_setprop(fdt, nodeoffset,
310 "linux,stdout-path", OF_STDOUT_PATH, strlen(OF_STDOUT_PATH)+1);
312 printf("WARNING: could not set linux,stdout-path %s.\n",
320 void do_fixup_by_path(void *fdt, const char *path, const char *prop,
321 const void *val, int len, int create)
325 debug("Updating property '%s/%s' = ", path, prop);
326 for (i = 0; i < len; i++)
327 debug(" %.2x", *(u8*)(val+i));
330 int rc = fdt_find_and_setprop(fdt, path, prop, val, len, create);
332 printf("Unable to update property %s:%s, err=%s\n",
333 path, prop, fdt_strerror(rc));
336 void do_fixup_by_path_u32(void *fdt, const char *path, const char *prop,
339 fdt32_t tmp = cpu_to_fdt32(val);
340 do_fixup_by_path(fdt, path, prop, &tmp, sizeof(tmp), create);
343 void do_fixup_by_prop(void *fdt,
344 const char *pname, const void *pval, int plen,
345 const char *prop, const void *val, int len,
351 debug("Updating property '%s' = ", prop);
352 for (i = 0; i < len; i++)
353 debug(" %.2x", *(u8*)(val+i));
356 off = fdt_node_offset_by_prop_value(fdt, -1, pname, pval, plen);
357 while (off != -FDT_ERR_NOTFOUND) {
358 if (create || (fdt_get_property(fdt, off, prop, NULL) != NULL))
359 fdt_setprop(fdt, off, prop, val, len);
360 off = fdt_node_offset_by_prop_value(fdt, off, pname, pval, plen);
364 void do_fixup_by_prop_u32(void *fdt,
365 const char *pname, const void *pval, int plen,
366 const char *prop, u32 val, int create)
368 fdt32_t tmp = cpu_to_fdt32(val);
369 do_fixup_by_prop(fdt, pname, pval, plen, prop, &tmp, 4, create);
372 void do_fixup_by_compat(void *fdt, const char *compat,
373 const char *prop, const void *val, int len, int create)
378 debug("Updating property '%s' = ", prop);
379 for (i = 0; i < len; i++)
380 debug(" %.2x", *(u8*)(val+i));
383 off = fdt_node_offset_by_compatible(fdt, -1, compat);
384 while (off != -FDT_ERR_NOTFOUND) {
385 if (create || (fdt_get_property(fdt, off, prop, NULL) != NULL))
386 fdt_setprop(fdt, off, prop, val, len);
387 off = fdt_node_offset_by_compatible(fdt, off, compat);
391 void do_fixup_by_compat_u32(void *fdt, const char *compat,
392 const char *prop, u32 val, int create)
394 fdt32_t tmp = cpu_to_fdt32(val);
395 do_fixup_by_compat(fdt, compat, prop, &tmp, 4, create);
398 #ifdef CONFIG_NR_DRAM_BANKS
399 #define MEMORY_BANKS_MAX CONFIG_NR_DRAM_BANKS
401 #define MEMORY_BANKS_MAX 4
403 int fdt_fixup_memory_banks(void *blob, u64 start[], u64 size[], int banks)
406 int addr_cell_len, size_cell_len, len;
407 u8 tmp[MEMORY_BANKS_MAX * 16]; /* Up to 64-bit address + 64-bit size */
410 if (banks > MEMORY_BANKS_MAX) {
411 printf("%s: num banks %d exceeds hardcoded limit %d."
412 " Recompile with higher MEMORY_BANKS_MAX?\n",
413 __FUNCTION__, banks, MEMORY_BANKS_MAX);
417 err = fdt_check_header(blob);
419 printf("%s: %s\n", __FUNCTION__, fdt_strerror(err));
423 /* find or create "/memory" node. */
424 nodeoffset = fdt_find_or_add_subnode(blob, 0, "memory");
428 err = fdt_setprop(blob, nodeoffset, "device_type", "memory",
431 printf("WARNING: could not set %s %s.\n", "device_type",
436 addr_cell_len = get_cells_len(blob, "#address-cells");
437 size_cell_len = get_cells_len(blob, "#size-cells");
439 for (bank = 0, len = 0; bank < banks; bank++) {
440 write_cell(tmp + len, start[bank], addr_cell_len);
441 len += addr_cell_len;
443 write_cell(tmp + len, size[bank], size_cell_len);
444 len += size_cell_len;
447 err = fdt_setprop(blob, nodeoffset, "reg", tmp, len);
449 printf("WARNING: could not set %s %s.\n",
450 "reg", fdt_strerror(err));
456 int fdt_fixup_memory(void *blob, u64 start, u64 size)
458 return fdt_fixup_memory_banks(blob, &start, &size, 1);
461 void fdt_fixup_ethernet(void *fdt)
464 char enet[16], *tmp, *end;
467 unsigned char mac_addr[6];
469 node = fdt_path_offset(fdt, "/aliases");
473 if (!getenv("ethaddr")) {
474 if (getenv("usbethaddr")) {
475 strcpy(mac, "usbethaddr");
477 debug("No ethernet MAC Address defined\n");
481 strcpy(mac, "ethaddr");
485 while ((tmp = getenv(mac)) != NULL) {
486 sprintf(enet, "ethernet%d", i);
487 path = fdt_getprop(fdt, node, enet, NULL);
489 debug("No alias for %s\n", enet);
490 sprintf(mac, "eth%daddr", ++i);
494 for (j = 0; j < 6; j++) {
495 mac_addr[j] = tmp ? simple_strtoul(tmp, &end, 16) : 0;
497 tmp = (*end) ? end+1 : end;
500 do_fixup_by_path(fdt, path, "mac-address", &mac_addr, 6, 0);
501 do_fixup_by_path(fdt, path, "local-mac-address",
504 sprintf(mac, "eth%daddr", ++i);
508 /* Resize the fdt to its actual size + a bit of padding */
509 int fdt_resize(void *blob)
519 total = fdt_num_mem_rsv(blob);
520 for (i = 0; i < total; i++) {
521 fdt_get_mem_rsv(blob, i, &addr, &size);
522 if (addr == (uintptr_t)blob) {
523 fdt_del_mem_rsv(blob, i);
529 * Calculate the actual size of the fdt
530 * plus the size needed for 5 fdt_add_mem_rsv, one
531 * for the fdt itself and 4 for a possible initrd
532 * ((initrd-start + initrd-end) * 2 (name & value))
534 actualsize = fdt_off_dt_strings(blob) +
535 fdt_size_dt_strings(blob) + 5 * sizeof(struct fdt_reserve_entry);
537 /* Make it so the fdt ends on a page boundary */
538 actualsize = ALIGN(actualsize + ((uintptr_t)blob & 0xfff), 0x1000);
539 actualsize = actualsize - ((uintptr_t)blob & 0xfff);
541 /* Change the fdt header to reflect the correct size */
542 fdt_set_totalsize(blob, actualsize);
544 /* Add the new reservation */
545 ret = fdt_add_mem_rsv(blob, (uintptr_t)blob, actualsize);
553 #define CONFIG_SYS_PCI_NR_INBOUND_WIN 4
555 #define FDT_PCI_PREFETCH (0x40000000)
556 #define FDT_PCI_MEM32 (0x02000000)
557 #define FDT_PCI_IO (0x01000000)
558 #define FDT_PCI_MEM64 (0x03000000)
560 int fdt_pci_dma_ranges(void *blob, int phb_off, struct pci_controller *hose) {
562 int addrcell, sizecell, len, r;
564 /* sized based on pci addr cells, size-cells, & address-cells */
565 u32 dma_ranges[(3 + 2 + 2) * CONFIG_SYS_PCI_NR_INBOUND_WIN];
567 addrcell = fdt_getprop_u32_default(blob, "/", "#address-cells", 1);
568 sizecell = fdt_getprop_u32_default(blob, "/", "#size-cells", 1);
570 dma_range = &dma_ranges[0];
571 for (r = 0; r < hose->region_count; r++) {
572 u64 bus_start, phys_start, size;
574 /* skip if !PCI_REGION_SYS_MEMORY */
575 if (!(hose->regions[r].flags & PCI_REGION_SYS_MEMORY))
578 bus_start = (u64)hose->regions[r].bus_start;
579 phys_start = (u64)hose->regions[r].phys_start;
580 size = (u64)hose->regions[r].size;
583 if (size >= 0x100000000ull)
584 dma_range[0] |= FDT_PCI_MEM64;
586 dma_range[0] |= FDT_PCI_MEM32;
587 if (hose->regions[r].flags & PCI_REGION_PREFETCH)
588 dma_range[0] |= FDT_PCI_PREFETCH;
589 #ifdef CONFIG_SYS_PCI_64BIT
590 dma_range[1] = bus_start >> 32;
594 dma_range[2] = bus_start & 0xffffffff;
597 dma_range[3] = phys_start >> 32;
598 dma_range[4] = phys_start & 0xffffffff;
600 dma_range[3] = phys_start & 0xffffffff;
604 dma_range[3 + addrcell + 0] = size >> 32;
605 dma_range[3 + addrcell + 1] = size & 0xffffffff;
607 dma_range[3 + addrcell + 0] = size & 0xffffffff;
610 dma_range += (3 + addrcell + sizecell);
613 len = dma_range - &dma_ranges[0];
615 fdt_setprop(blob, phb_off, "dma-ranges", &dma_ranges[0], len*4);
621 #ifdef CONFIG_FDT_FIXUP_NOR_FLASH_SIZE
623 * Provide a weak default function to return the flash bank size.
624 * There might be multiple non-identical flash chips connected to one
625 * chip-select, so we need to pass an index as well.
627 u32 __flash_get_bank_size(int cs, int idx)
629 extern flash_info_t flash_info[];
632 * As default, a simple 1:1 mapping is provided. Boards with
633 * a different mapping need to supply a board specific mapping
636 return flash_info[cs].size;
638 u32 flash_get_bank_size(int cs, int idx)
639 __attribute__((weak, alias("__flash_get_bank_size")));
642 * This function can be used to update the size in the "reg" property
643 * of all NOR FLASH device nodes. This is necessary for boards with
644 * non-fixed NOR FLASH sizes.
646 int fdt_fixup_nor_flash_size(void *blob)
648 char compat[][16] = { "cfi-flash", "jedec-flash" };
651 struct fdt_property *prop;
655 for (i = 0; i < 2; i++) {
656 off = fdt_node_offset_by_compatible(blob, -1, compat[i]);
657 while (off != -FDT_ERR_NOTFOUND) {
661 * Found one compatible node, so fixup the size
662 * int its reg properties
664 prop = fdt_get_property_w(blob, off, "reg", &len);
666 int tuple_size = 3 * sizeof(reg);
669 * There might be multiple reg-tuples,
670 * so loop through them all
672 reg = reg2 = (u32 *)&prop->data[0];
673 for (idx = 0; idx < (len / tuple_size); idx++) {
675 * Update size in reg property
677 reg[2] = flash_get_bank_size(reg[0],
681 * Point to next reg tuple
686 fdt_setprop(blob, off, "reg", reg2, len);
689 /* Move to next compatible node */
690 off = fdt_node_offset_by_compatible(blob, off,
699 int fdt_increase_size(void *fdt, int add_len)
703 newlen = fdt_totalsize(fdt) + add_len;
705 /* Open in place with a new len */
706 return fdt_open_into(fdt, fdt, newlen);
709 #ifdef CONFIG_FDT_FIXUP_PARTITIONS
710 #include <jffs2/load_kernel.h>
711 #include <mtd_node.h>
718 int fdt_del_subnodes(const void *blob, int parent_offset)
723 for (ndepth = 0, off = fdt_next_node(blob, parent_offset, &ndepth);
724 (off >= 0) && (ndepth > 0);
725 off = fdt_next_node(blob, off, &ndepth)) {
727 debug("delete %s: offset: %x\n",
728 fdt_get_name(blob, off, 0), off);
729 ret = fdt_del_node((void *)blob, off);
731 printf("Can't delete node: %s\n",
743 int fdt_del_partitions(void *blob, int parent_offset)
750 off = fdt_next_node(blob, parent_offset, &ndepth);
751 if (off > 0 && ndepth == 1) {
752 prop = fdt_getprop(blob, off, "label", NULL);
755 * Could not find label property, nand {}; node?
756 * Check subnode, delete partitions there if any.
758 return fdt_del_partitions(blob, off);
760 ret = fdt_del_subnodes(blob, parent_offset);
762 printf("Can't remove subnodes: %s\n",
771 int fdt_node_set_part_info(void *blob, int parent_offset,
772 struct mtd_device *dev)
774 struct list_head *pentry;
775 struct part_info *part;
776 struct reg_cell cell;
781 ret = fdt_del_partitions(blob, parent_offset);
786 * Check if it is nand {}; subnode, adjust
787 * the offset in this case
789 off = fdt_next_node(blob, parent_offset, &ndepth);
790 if (off > 0 && ndepth == 1)
794 list_for_each_prev(pentry, &dev->parts) {
797 part = list_entry(pentry, struct part_info, link);
799 debug("%2d: %-20s0x%08llx\t0x%08llx\t%d\n",
800 part_num, part->name, part->size,
801 part->offset, part->mask_flags);
803 sprintf(buf, "partition@%llx", part->offset);
805 ret = fdt_add_subnode(blob, parent_offset, buf);
806 if (ret == -FDT_ERR_NOSPACE) {
807 ret = fdt_increase_size(blob, 512);
812 } else if (ret < 0) {
813 printf("Can't add partition node: %s\n",
819 /* Check MTD_WRITEABLE_CMD flag */
820 if (part->mask_flags & 1) {
822 ret = fdt_setprop(blob, newoff, "read_only", NULL, 0);
823 if (ret == -FDT_ERR_NOSPACE) {
824 ret = fdt_increase_size(blob, 512);
833 cell.r0 = cpu_to_fdt32(part->offset);
834 cell.r1 = cpu_to_fdt32(part->size);
836 ret = fdt_setprop(blob, newoff, "reg", &cell, sizeof(cell));
837 if (ret == -FDT_ERR_NOSPACE) {
838 ret = fdt_increase_size(blob, 512);
847 ret = fdt_setprop_string(blob, newoff, "label", part->name);
848 if (ret == -FDT_ERR_NOSPACE) {
849 ret = fdt_increase_size(blob, 512);
861 printf("Can't increase blob size: %s\n", fdt_strerror(ret));
864 printf("Can't add property: %s\n", fdt_strerror(ret));
869 * Update partitions in nor/nand nodes using info from
870 * mtdparts environment variable. The nodes to update are
871 * specified by node_info structure which contains mtd device
872 * type and compatible string: E. g. the board code in
873 * ft_board_setup() could use:
875 * struct node_info nodes[] = {
876 * { "fsl,mpc5121-nfc", MTD_DEV_TYPE_NAND, },
877 * { "cfi-flash", MTD_DEV_TYPE_NOR, },
880 * fdt_fixup_mtdparts(blob, nodes, ARRAY_SIZE(nodes));
882 void fdt_fixup_mtdparts(void *blob, void *node_info, int node_info_size)
884 struct node_info *ni = node_info;
885 struct mtd_device *dev;
890 parts = getenv("mtdparts");
894 if (mtdparts_init() != 0)
897 for (i = 0; i < node_info_size; i++) {
899 noff = fdt_node_offset_by_compatible(blob, -1, ni[i].compat);
900 while (noff != -FDT_ERR_NOTFOUND) {
901 debug("%s: %s, mtd dev type %d\n",
902 fdt_get_name(blob, noff, 0),
903 ni[i].compat, ni[i].type);
904 dev = device_find(ni[i].type, idx++);
906 if (fdt_node_set_part_info(blob, noff, dev))
907 return; /* return on error */
910 /* Jump to next flash node */
911 noff = fdt_node_offset_by_compatible(blob, noff,
918 void fdt_del_node_and_alias(void *blob, const char *alias)
920 int off = fdt_path_offset(blob, alias);
925 fdt_del_node(blob, off);
927 off = fdt_path_offset(blob, "/aliases");
928 fdt_delprop(blob, off, alias);
931 /* Helper to read a big number; size is in cells (not bytes) */
932 static inline u64 of_read_number(const fdt32_t *cell, int size)
936 r = (r << 32) | fdt32_to_cpu(*(cell++));
942 /* Max address size we deal with */
943 #define OF_MAX_ADDR_CELLS 4
944 #define OF_BAD_ADDR ((u64)-1)
945 #define OF_CHECK_COUNTS(na, ns) ((na) > 0 && (na) <= OF_MAX_ADDR_CELLS && \
950 static void of_dump_addr(const char *s, const fdt32_t *addr, int na)
954 printf(" %08x", *(addr++));
958 static void of_dump_addr(const char *s, const fdt32_t *addr, int na) { }
961 /* Callbacks for bus specific translators */
964 const char *addresses;
965 void (*count_cells)(void *blob, int parentoffset,
966 int *addrc, int *sizec);
967 u64 (*map)(fdt32_t *addr, const fdt32_t *range,
968 int na, int ns, int pna);
969 int (*translate)(fdt32_t *addr, u64 offset, int na);
972 /* Default translator (generic bus) */
973 static void of_bus_default_count_cells(void *blob, int parentoffset,
974 int *addrc, int *sizec)
979 prop = fdt_getprop(blob, parentoffset, "#address-cells", NULL);
981 *addrc = be32_to_cpup(prop);
987 prop = fdt_getprop(blob, parentoffset, "#size-cells", NULL);
989 *sizec = be32_to_cpup(prop);
995 static u64 of_bus_default_map(fdt32_t *addr, const fdt32_t *range,
996 int na, int ns, int pna)
1000 cp = of_read_number(range, na);
1001 s = of_read_number(range + na + pna, ns);
1002 da = of_read_number(addr, na);
1004 debug("OF: default map, cp="PRu64", s="PRu64", da="PRu64"\n",
1007 if (da < cp || da >= (cp + s))
1012 static int of_bus_default_translate(fdt32_t *addr, u64 offset, int na)
1014 u64 a = of_read_number(addr, na);
1015 memset(addr, 0, na * 4);
1018 addr[na - 2] = cpu_to_fdt32(a >> 32);
1019 addr[na - 1] = cpu_to_fdt32(a & 0xffffffffu);
1024 /* Array of bus specific translators */
1025 static struct of_bus of_busses[] = {
1030 .count_cells = of_bus_default_count_cells,
1031 .map = of_bus_default_map,
1032 .translate = of_bus_default_translate,
1036 static int of_translate_one(void * blob, int parent, struct of_bus *bus,
1037 struct of_bus *pbus, fdt32_t *addr,
1038 int na, int ns, int pna, const char *rprop)
1040 const fdt32_t *ranges;
1043 u64 offset = OF_BAD_ADDR;
1045 /* Normally, an absence of a "ranges" property means we are
1046 * crossing a non-translatable boundary, and thus the addresses
1047 * below the current not cannot be converted to CPU physical ones.
1048 * Unfortunately, while this is very clear in the spec, it's not
1049 * what Apple understood, and they do have things like /uni-n or
1050 * /ht nodes with no "ranges" property and a lot of perfectly
1051 * useable mapped devices below them. Thus we treat the absence of
1052 * "ranges" as equivalent to an empty "ranges" property which means
1053 * a 1:1 translation at that level. It's up to the caller not to try
1054 * to translate addresses that aren't supposed to be translated in
1055 * the first place. --BenH.
1057 ranges = fdt_getprop(blob, parent, rprop, &rlen);
1058 if (ranges == NULL || rlen == 0) {
1059 offset = of_read_number(addr, na);
1060 memset(addr, 0, pna * 4);
1061 debug("OF: no ranges, 1:1 translation\n");
1065 debug("OF: walking ranges...\n");
1067 /* Now walk through the ranges */
1069 rone = na + pna + ns;
1070 for (; rlen >= rone; rlen -= rone, ranges += rone) {
1071 offset = bus->map(addr, ranges, na, ns, pna);
1072 if (offset != OF_BAD_ADDR)
1075 if (offset == OF_BAD_ADDR) {
1076 debug("OF: not found !\n");
1079 memcpy(addr, ranges + na, 4 * pna);
1082 of_dump_addr("OF: parent translation for:", addr, pna);
1083 debug("OF: with offset: "PRu64"\n", offset);
1085 /* Translate it into parent bus space */
1086 return pbus->translate(addr, offset, pna);
1090 * Translate an address from the device-tree into a CPU physical address,
1091 * this walks up the tree and applies the various bus mappings on the
1094 * Note: We consider that crossing any level with #size-cells == 0 to mean
1095 * that translation is impossible (that is we are not dealing with a value
1096 * that can be mapped to a cpu physical address). This is not really specified
1097 * that way, but this is traditionally the way IBM at least do things
1099 static u64 __of_translate_address(void *blob, int node_offset, const fdt32_t *in_addr,
1103 struct of_bus *bus, *pbus;
1104 fdt32_t addr[OF_MAX_ADDR_CELLS];
1105 int na, ns, pna, pns;
1106 u64 result = OF_BAD_ADDR;
1108 debug("OF: ** translation for device %s **\n",
1109 fdt_get_name(blob, node_offset, NULL));
1111 /* Get parent & match bus type */
1112 parent = fdt_parent_offset(blob, node_offset);
1115 bus = &of_busses[0];
1117 /* Cound address cells & copy address locally */
1118 bus->count_cells(blob, parent, &na, &ns);
1119 if (!OF_CHECK_COUNTS(na, ns)) {
1120 printf("%s: Bad cell count for %s\n", __FUNCTION__,
1121 fdt_get_name(blob, node_offset, NULL));
1124 memcpy(addr, in_addr, na * 4);
1126 debug("OF: bus is %s (na=%d, ns=%d) on %s\n",
1127 bus->name, na, ns, fdt_get_name(blob, parent, NULL));
1128 of_dump_addr("OF: translating address:", addr, na);
1132 /* Switch to parent bus */
1133 node_offset = parent;
1134 parent = fdt_parent_offset(blob, node_offset);
1136 /* If root, we have finished */
1138 debug("OF: reached root node\n");
1139 result = of_read_number(addr, na);
1143 /* Get new parent bus and counts */
1144 pbus = &of_busses[0];
1145 pbus->count_cells(blob, parent, &pna, &pns);
1146 if (!OF_CHECK_COUNTS(pna, pns)) {
1147 printf("%s: Bad cell count for %s\n", __FUNCTION__,
1148 fdt_get_name(blob, node_offset, NULL));
1152 debug("OF: parent bus is %s (na=%d, ns=%d) on %s\n",
1153 pbus->name, pna, pns, fdt_get_name(blob, parent, NULL));
1155 /* Apply bus translation */
1156 if (of_translate_one(blob, node_offset, bus, pbus,
1157 addr, na, ns, pna, rprop))
1160 /* Complete the move up one level */
1165 of_dump_addr("OF: one level translation:", addr, na);
1172 u64 fdt_translate_address(void *blob, int node_offset, const fdt32_t *in_addr)
1174 return __of_translate_address(blob, node_offset, in_addr, "ranges");
1178 * fdt_node_offset_by_compat_reg: Find a node that matches compatiable and
1179 * who's reg property matches a physical cpu address
1181 * @blob: ptr to device tree
1182 * @compat: compatiable string to match
1183 * @compat_off: property name
1186 int fdt_node_offset_by_compat_reg(void *blob, const char *compat,
1187 phys_addr_t compat_off)
1189 int len, off = fdt_node_offset_by_compatible(blob, -1, compat);
1190 while (off != -FDT_ERR_NOTFOUND) {
1191 const fdt32_t *reg = fdt_getprop(blob, off, "reg", &len);
1193 if (compat_off == fdt_translate_address(blob, off, reg))
1196 off = fdt_node_offset_by_compatible(blob, off, compat);
1199 return -FDT_ERR_NOTFOUND;
1203 * fdt_alloc_phandle: Return next free phandle value
1205 * @blob: ptr to device tree
1207 int fdt_alloc_phandle(void *blob)
1209 int offset, phandle = 0;
1211 for (offset = fdt_next_node(blob, -1, NULL); offset >= 0;
1212 offset = fdt_next_node(blob, offset, NULL)) {
1213 phandle = max(phandle, fdt_get_phandle(blob, offset));
1220 * fdt_set_phandle: Create a phandle property for the given node
1222 * @fdt: ptr to device tree
1223 * @nodeoffset: node to update
1224 * @phandle: phandle value to set (must be unique)
1226 int fdt_set_phandle(void *fdt, int nodeoffset, uint32_t phandle)
1231 int off = fdt_node_offset_by_phandle(fdt, phandle);
1233 if ((off >= 0) && (off != nodeoffset)) {
1236 fdt_get_path(fdt, nodeoffset, buf, sizeof(buf));
1237 printf("Trying to update node %s with phandle %u ",
1240 fdt_get_path(fdt, off, buf, sizeof(buf));
1241 printf("that already exists in node %s.\n", buf);
1242 return -FDT_ERR_BADPHANDLE;
1246 ret = fdt_setprop_cell(fdt, nodeoffset, "phandle", phandle);
1251 * For now, also set the deprecated "linux,phandle" property, so that we
1252 * don't break older kernels.
1254 ret = fdt_setprop_cell(fdt, nodeoffset, "linux,phandle", phandle);
1260 * fdt_create_phandle: Create a phandle property for the given node
1262 * @fdt: ptr to device tree
1263 * @nodeoffset: node to update
1265 unsigned int fdt_create_phandle(void *fdt, int nodeoffset)
1267 /* see if there is a phandle already */
1268 int phandle = fdt_get_phandle(fdt, nodeoffset);
1270 /* if we got 0, means no phandle so create one */
1274 phandle = fdt_alloc_phandle(fdt);
1275 ret = fdt_set_phandle(fdt, nodeoffset, phandle);
1277 printf("Can't set phandle %u: %s\n", phandle,
1287 * fdt_set_node_status: Set status for the given node
1289 * @fdt: ptr to device tree
1290 * @nodeoffset: node to update
1291 * @status: FDT_STATUS_OKAY, FDT_STATUS_DISABLED,
1292 * FDT_STATUS_FAIL, FDT_STATUS_FAIL_ERROR_CODE
1293 * @error_code: optional, only used if status is FDT_STATUS_FAIL_ERROR_CODE
1295 int fdt_set_node_status(void *fdt, int nodeoffset,
1296 enum fdt_status status, unsigned int error_code)
1305 case FDT_STATUS_OKAY:
1306 ret = fdt_setprop_string(fdt, nodeoffset, "status", "okay");
1308 case FDT_STATUS_DISABLED:
1309 ret = fdt_setprop_string(fdt, nodeoffset, "status", "disabled");
1311 case FDT_STATUS_FAIL:
1312 ret = fdt_setprop_string(fdt, nodeoffset, "status", "fail");
1314 case FDT_STATUS_FAIL_ERROR_CODE:
1315 sprintf(buf, "fail-%d", error_code);
1316 ret = fdt_setprop_string(fdt, nodeoffset, "status", buf);
1319 printf("Invalid fdt status: %x\n", status);
1328 * fdt_set_status_by_alias: Set status for the given node given an alias
1330 * @fdt: ptr to device tree
1331 * @alias: alias of node to update
1332 * @status: FDT_STATUS_OKAY, FDT_STATUS_DISABLED,
1333 * FDT_STATUS_FAIL, FDT_STATUS_FAIL_ERROR_CODE
1334 * @error_code: optional, only used if status is FDT_STATUS_FAIL_ERROR_CODE
1336 int fdt_set_status_by_alias(void *fdt, const char* alias,
1337 enum fdt_status status, unsigned int error_code)
1339 int offset = fdt_path_offset(fdt, alias);
1341 return fdt_set_node_status(fdt, offset, status, error_code);
1344 #if defined(CONFIG_VIDEO) || defined(CONFIG_LCD)
1345 int fdt_add_edid(void *blob, const char *compat, unsigned char *edid_buf)
1350 noff = fdt_node_offset_by_compatible(blob, -1, compat);
1351 if (noff != -FDT_ERR_NOTFOUND) {
1352 debug("%s: %s\n", fdt_get_name(blob, noff, 0), compat);
1354 ret = fdt_setprop(blob, noff, "edid", edid_buf, 128);
1355 if (ret == -FDT_ERR_NOSPACE) {
1356 ret = fdt_increase_size(blob, 512);
1361 } else if (ret < 0) {
1362 printf("Can't add property: %s\n", fdt_strerror(ret));
1368 printf("Can't increase blob size: %s\n", fdt_strerror(ret));
1374 * Verify the physical address of device tree node for a given alias
1376 * This function locates the device tree node of a given alias, and then
1377 * verifies that the physical address of that device matches the given
1378 * parameter. It displays a message if there is a mismatch.
1380 * Returns 1 on success, 0 on failure
1382 int fdt_verify_alias_address(void *fdt, int anode, const char *alias, u64 addr)
1389 path = fdt_getprop(fdt, anode, alias, NULL);
1391 /* If there's no such alias, then it's not a failure */
1395 node = fdt_path_offset(fdt, path);
1397 printf("Warning: device tree alias '%s' points to invalid "
1398 "node %s.\n", alias, path);
1402 reg = fdt_getprop(fdt, node, "reg", &len);
1404 printf("Warning: device tree node '%s' has no address.\n",
1409 dt_addr = fdt_translate_address(fdt, node, reg);
1410 if (addr != dt_addr) {
1411 printf("Warning: U-Boot configured device %s at address %llx,\n"
1412 " but the device tree has it address %llx.\n",
1413 alias, addr, dt_addr);
1421 * Returns the base address of an SOC or PCI node
1423 u64 fdt_get_base_address(void *fdt, int node)
1427 const fdt32_t *prop;
1429 prop = fdt_getprop(fdt, node, "#address-cells", &size);
1430 if (prop && size == 4)
1431 naddr = be32_to_cpup(prop);
1435 prop = fdt_getprop(fdt, node, "ranges", &size);
1437 return prop ? fdt_translate_address(fdt, node, prop + naddr) : 0;
1441 * Read a property of size <prop_len>. Currently only supports 1 or 2 cells.
1443 static int fdt_read_prop(const fdt32_t *prop, int prop_len, int cell_off,
1444 uint64_t *val, int cells)
1446 const fdt32_t *prop32 = &prop[cell_off];
1447 const fdt64_t *prop64 = (const fdt64_t *)&prop[cell_off];
1449 if ((cell_off + cells) > prop_len)
1450 return -FDT_ERR_NOSPACE;
1454 *val = fdt32_to_cpu(*prop32);
1457 *val = fdt64_to_cpu(*prop64);
1460 return -FDT_ERR_NOSPACE;
1467 * fdt_read_range - Read a node's n'th range property
1469 * @fdt: ptr to device tree
1470 * @node: offset of node
1472 * @child_addr: pointer to storage for the "child address" field
1473 * @addr: pointer to storage for the CPU view translated physical start
1474 * @len: pointer to storage for the range length
1476 * Convenience function that reads and interprets a specific range out of
1477 * a number of the "ranges" property array.
1479 int fdt_read_range(void *fdt, int node, int n, uint64_t *child_addr,
1480 uint64_t *addr, uint64_t *len)
1482 int pnode = fdt_parent_offset(fdt, node);
1483 const fdt32_t *ranges;
1492 * The "ranges" property is an array of
1493 * { <child address> <parent address> <size in child address space> }
1495 * All 3 elements can span a diffent number of cells. Fetch their size.
1497 pacells = fdt_getprop_u32_default_node(fdt, pnode, 0, "#address-cells", 1);
1498 acells = fdt_getprop_u32_default_node(fdt, node, 0, "#address-cells", 1);
1499 scells = fdt_getprop_u32_default_node(fdt, node, 0, "#size-cells", 1);
1501 /* Now try to get the ranges property */
1502 ranges = fdt_getprop(fdt, node, "ranges", &ranges_len);
1504 return -FDT_ERR_NOTFOUND;
1505 ranges_len /= sizeof(uint32_t);
1507 /* Jump to the n'th entry */
1508 cell = n * (pacells + acells + scells);
1510 /* Read <child address> */
1512 r = fdt_read_prop(ranges, ranges_len, cell, child_addr,
1519 /* Read <parent address> */
1521 *addr = fdt_translate_address(fdt, node, ranges + cell);
1524 /* Read <size in child address space> */
1526 r = fdt_read_prop(ranges, ranges_len, cell, len, scells);