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, int force)
208 int nodeoffset, addr_cell_len;
214 /* find or create "/chosen" node. */
215 nodeoffset = fdt_find_or_add_subnode(fdt, 0, "chosen");
219 /* just return if initrd_start/end aren't valid */
220 if ((initrd_start == 0) || (initrd_end == 0))
223 total = fdt_num_mem_rsv(fdt);
226 * Look for an existing entry and update it. If we don't find
227 * the entry, we will j be the next available slot.
229 for (j = 0; j < total; j++) {
230 err = fdt_get_mem_rsv(fdt, j, &addr, &size);
231 if (addr == initrd_start) {
232 fdt_del_mem_rsv(fdt, j);
237 err = fdt_add_mem_rsv(fdt, initrd_start, initrd_end - initrd_start);
239 printf("fdt_initrd: %s\n", fdt_strerror(err));
243 addr_cell_len = get_cells_len(fdt, "#address-cells");
245 path = fdt_getprop(fdt, nodeoffset, "linux,initrd-start", NULL);
246 if ((path == NULL) || force) {
247 write_cell((u8 *)&tmp, initrd_start, addr_cell_len);
248 err = fdt_setprop(fdt, nodeoffset,
249 "linux,initrd-start", &tmp, addr_cell_len);
252 "could not set linux,initrd-start %s.\n",
256 write_cell((u8 *)&tmp, initrd_end, addr_cell_len);
257 err = fdt_setprop(fdt, nodeoffset,
258 "linux,initrd-end", &tmp, addr_cell_len);
260 printf("WARNING: could not set linux,initrd-end %s.\n",
270 int fdt_chosen(void *fdt, int force)
274 char *str; /* used to set string properties */
277 err = fdt_check_header(fdt);
279 printf("fdt_chosen: %s\n", fdt_strerror(err));
283 /* find or create "/chosen" node. */
284 nodeoffset = fdt_find_or_add_subnode(fdt, 0, "chosen");
289 * Create /chosen properites that don't exist in the fdt.
290 * If the property exists, update it only if the "force" parameter
293 str = getenv("bootargs");
295 path = fdt_getprop(fdt, nodeoffset, "bootargs", NULL);
296 if ((path == NULL) || force) {
297 err = fdt_setprop(fdt, nodeoffset,
298 "bootargs", str, strlen(str)+1);
300 printf("WARNING: could not set bootargs %s.\n",
305 #ifdef CONFIG_OF_STDOUT_VIA_ALIAS
306 path = fdt_getprop(fdt, nodeoffset, "linux,stdout-path", NULL);
307 if ((path == NULL) || force)
308 err = fdt_fixup_stdout(fdt, nodeoffset);
311 #ifdef OF_STDOUT_PATH
312 path = fdt_getprop(fdt, nodeoffset, "linux,stdout-path", NULL);
313 if ((path == NULL) || force) {
314 err = fdt_setprop(fdt, nodeoffset,
315 "linux,stdout-path", OF_STDOUT_PATH, strlen(OF_STDOUT_PATH)+1);
317 printf("WARNING: could not set linux,stdout-path %s.\n",
325 void do_fixup_by_path(void *fdt, const char *path, const char *prop,
326 const void *val, int len, int create)
330 debug("Updating property '%s/%s' = ", path, prop);
331 for (i = 0; i < len; i++)
332 debug(" %.2x", *(u8*)(val+i));
335 int rc = fdt_find_and_setprop(fdt, path, prop, val, len, create);
337 printf("Unable to update property %s:%s, err=%s\n",
338 path, prop, fdt_strerror(rc));
341 void do_fixup_by_path_u32(void *fdt, const char *path, const char *prop,
344 fdt32_t tmp = cpu_to_fdt32(val);
345 do_fixup_by_path(fdt, path, prop, &tmp, sizeof(tmp), create);
348 void do_fixup_by_prop(void *fdt,
349 const char *pname, const void *pval, int plen,
350 const char *prop, const void *val, int len,
356 debug("Updating property '%s' = ", prop);
357 for (i = 0; i < len; i++)
358 debug(" %.2x", *(u8*)(val+i));
361 off = fdt_node_offset_by_prop_value(fdt, -1, pname, pval, plen);
362 while (off != -FDT_ERR_NOTFOUND) {
363 if (create || (fdt_get_property(fdt, off, prop, NULL) != NULL))
364 fdt_setprop(fdt, off, prop, val, len);
365 off = fdt_node_offset_by_prop_value(fdt, off, pname, pval, plen);
369 void do_fixup_by_prop_u32(void *fdt,
370 const char *pname, const void *pval, int plen,
371 const char *prop, u32 val, int create)
373 fdt32_t tmp = cpu_to_fdt32(val);
374 do_fixup_by_prop(fdt, pname, pval, plen, prop, &tmp, 4, create);
377 void do_fixup_by_compat(void *fdt, const char *compat,
378 const char *prop, const void *val, int len, int create)
383 debug("Updating property '%s' = ", prop);
384 for (i = 0; i < len; i++)
385 debug(" %.2x", *(u8*)(val+i));
388 off = fdt_node_offset_by_compatible(fdt, -1, compat);
389 while (off != -FDT_ERR_NOTFOUND) {
390 if (create || (fdt_get_property(fdt, off, prop, NULL) != NULL))
391 fdt_setprop(fdt, off, prop, val, len);
392 off = fdt_node_offset_by_compatible(fdt, off, compat);
396 void do_fixup_by_compat_u32(void *fdt, const char *compat,
397 const char *prop, u32 val, int create)
399 fdt32_t tmp = cpu_to_fdt32(val);
400 do_fixup_by_compat(fdt, compat, prop, &tmp, 4, create);
403 #ifdef CONFIG_NR_DRAM_BANKS
404 #define MEMORY_BANKS_MAX CONFIG_NR_DRAM_BANKS
406 #define MEMORY_BANKS_MAX 4
408 int fdt_fixup_memory_banks(void *blob, u64 start[], u64 size[], int banks)
411 int addr_cell_len, size_cell_len, len;
412 u8 tmp[MEMORY_BANKS_MAX * 16]; /* Up to 64-bit address + 64-bit size */
415 if (banks > MEMORY_BANKS_MAX) {
416 printf("%s: num banks %d exceeds hardcoded limit %d."
417 " Recompile with higher MEMORY_BANKS_MAX?\n",
418 __FUNCTION__, banks, MEMORY_BANKS_MAX);
422 err = fdt_check_header(blob);
424 printf("%s: %s\n", __FUNCTION__, fdt_strerror(err));
428 /* find or create "/memory" node. */
429 nodeoffset = fdt_find_or_add_subnode(blob, 0, "memory");
433 err = fdt_setprop(blob, nodeoffset, "device_type", "memory",
436 printf("WARNING: could not set %s %s.\n", "device_type",
441 addr_cell_len = get_cells_len(blob, "#address-cells");
442 size_cell_len = get_cells_len(blob, "#size-cells");
444 for (bank = 0, len = 0; bank < banks; bank++) {
445 write_cell(tmp + len, start[bank], addr_cell_len);
446 len += addr_cell_len;
448 write_cell(tmp + len, size[bank], size_cell_len);
449 len += size_cell_len;
452 err = fdt_setprop(blob, nodeoffset, "reg", tmp, len);
454 printf("WARNING: could not set %s %s.\n",
455 "reg", fdt_strerror(err));
461 int fdt_fixup_memory(void *blob, u64 start, u64 size)
463 return fdt_fixup_memory_banks(blob, &start, &size, 1);
466 void fdt_fixup_ethernet(void *fdt)
469 char enet[16], *tmp, *end;
472 unsigned char mac_addr[6];
474 node = fdt_path_offset(fdt, "/aliases");
478 if (!getenv("ethaddr")) {
479 if (getenv("usbethaddr")) {
480 strcpy(mac, "usbethaddr");
482 debug("No ethernet MAC Address defined\n");
486 strcpy(mac, "ethaddr");
490 while ((tmp = getenv(mac)) != NULL) {
491 sprintf(enet, "ethernet%d", i);
492 path = fdt_getprop(fdt, node, enet, NULL);
494 debug("No alias for %s\n", enet);
495 sprintf(mac, "eth%daddr", ++i);
499 for (j = 0; j < 6; j++) {
500 mac_addr[j] = tmp ? simple_strtoul(tmp, &end, 16) : 0;
502 tmp = (*end) ? end+1 : end;
505 do_fixup_by_path(fdt, path, "mac-address", &mac_addr, 6, 0);
506 do_fixup_by_path(fdt, path, "local-mac-address",
509 sprintf(mac, "eth%daddr", ++i);
513 /* Resize the fdt to its actual size + a bit of padding */
514 int fdt_resize(void *blob)
524 total = fdt_num_mem_rsv(blob);
525 for (i = 0; i < total; i++) {
526 fdt_get_mem_rsv(blob, i, &addr, &size);
527 if (addr == (uintptr_t)blob) {
528 fdt_del_mem_rsv(blob, i);
534 * Calculate the actual size of the fdt
535 * plus the size needed for 5 fdt_add_mem_rsv, one
536 * for the fdt itself and 4 for a possible initrd
537 * ((initrd-start + initrd-end) * 2 (name & value))
539 actualsize = fdt_off_dt_strings(blob) +
540 fdt_size_dt_strings(blob) + 5 * sizeof(struct fdt_reserve_entry);
542 /* Make it so the fdt ends on a page boundary */
543 actualsize = ALIGN(actualsize + ((uintptr_t)blob & 0xfff), 0x1000);
544 actualsize = actualsize - ((uintptr_t)blob & 0xfff);
546 /* Change the fdt header to reflect the correct size */
547 fdt_set_totalsize(blob, actualsize);
549 /* Add the new reservation */
550 ret = fdt_add_mem_rsv(blob, (uintptr_t)blob, actualsize);
558 #define CONFIG_SYS_PCI_NR_INBOUND_WIN 4
560 #define FDT_PCI_PREFETCH (0x40000000)
561 #define FDT_PCI_MEM32 (0x02000000)
562 #define FDT_PCI_IO (0x01000000)
563 #define FDT_PCI_MEM64 (0x03000000)
565 int fdt_pci_dma_ranges(void *blob, int phb_off, struct pci_controller *hose) {
567 int addrcell, sizecell, len, r;
569 /* sized based on pci addr cells, size-cells, & address-cells */
570 u32 dma_ranges[(3 + 2 + 2) * CONFIG_SYS_PCI_NR_INBOUND_WIN];
572 addrcell = fdt_getprop_u32_default(blob, "/", "#address-cells", 1);
573 sizecell = fdt_getprop_u32_default(blob, "/", "#size-cells", 1);
575 dma_range = &dma_ranges[0];
576 for (r = 0; r < hose->region_count; r++) {
577 u64 bus_start, phys_start, size;
579 /* skip if !PCI_REGION_SYS_MEMORY */
580 if (!(hose->regions[r].flags & PCI_REGION_SYS_MEMORY))
583 bus_start = (u64)hose->regions[r].bus_start;
584 phys_start = (u64)hose->regions[r].phys_start;
585 size = (u64)hose->regions[r].size;
588 if (size >= 0x100000000ull)
589 dma_range[0] |= FDT_PCI_MEM64;
591 dma_range[0] |= FDT_PCI_MEM32;
592 if (hose->regions[r].flags & PCI_REGION_PREFETCH)
593 dma_range[0] |= FDT_PCI_PREFETCH;
594 #ifdef CONFIG_SYS_PCI_64BIT
595 dma_range[1] = bus_start >> 32;
599 dma_range[2] = bus_start & 0xffffffff;
602 dma_range[3] = phys_start >> 32;
603 dma_range[4] = phys_start & 0xffffffff;
605 dma_range[3] = phys_start & 0xffffffff;
609 dma_range[3 + addrcell + 0] = size >> 32;
610 dma_range[3 + addrcell + 1] = size & 0xffffffff;
612 dma_range[3 + addrcell + 0] = size & 0xffffffff;
615 dma_range += (3 + addrcell + sizecell);
618 len = dma_range - &dma_ranges[0];
620 fdt_setprop(blob, phb_off, "dma-ranges", &dma_ranges[0], len*4);
626 #ifdef CONFIG_FDT_FIXUP_NOR_FLASH_SIZE
628 * Provide a weak default function to return the flash bank size.
629 * There might be multiple non-identical flash chips connected to one
630 * chip-select, so we need to pass an index as well.
632 u32 __flash_get_bank_size(int cs, int idx)
634 extern flash_info_t flash_info[];
637 * As default, a simple 1:1 mapping is provided. Boards with
638 * a different mapping need to supply a board specific mapping
641 return flash_info[cs].size;
643 u32 flash_get_bank_size(int cs, int idx)
644 __attribute__((weak, alias("__flash_get_bank_size")));
647 * This function can be used to update the size in the "reg" property
648 * of all NOR FLASH device nodes. This is necessary for boards with
649 * non-fixed NOR FLASH sizes.
651 int fdt_fixup_nor_flash_size(void *blob)
653 char compat[][16] = { "cfi-flash", "jedec-flash" };
656 struct fdt_property *prop;
660 for (i = 0; i < 2; i++) {
661 off = fdt_node_offset_by_compatible(blob, -1, compat[i]);
662 while (off != -FDT_ERR_NOTFOUND) {
666 * Found one compatible node, so fixup the size
667 * int its reg properties
669 prop = fdt_get_property_w(blob, off, "reg", &len);
671 int tuple_size = 3 * sizeof(reg);
674 * There might be multiple reg-tuples,
675 * so loop through them all
677 reg = reg2 = (u32 *)&prop->data[0];
678 for (idx = 0; idx < (len / tuple_size); idx++) {
680 * Update size in reg property
682 reg[2] = flash_get_bank_size(reg[0],
686 * Point to next reg tuple
691 fdt_setprop(blob, off, "reg", reg2, len);
694 /* Move to next compatible node */
695 off = fdt_node_offset_by_compatible(blob, off,
704 int fdt_increase_size(void *fdt, int add_len)
708 newlen = fdt_totalsize(fdt) + add_len;
710 /* Open in place with a new len */
711 return fdt_open_into(fdt, fdt, newlen);
714 #ifdef CONFIG_FDT_FIXUP_PARTITIONS
715 #include <jffs2/load_kernel.h>
716 #include <mtd_node.h>
723 int fdt_del_subnodes(const void *blob, int parent_offset)
728 for (ndepth = 0, off = fdt_next_node(blob, parent_offset, &ndepth);
729 (off >= 0) && (ndepth > 0);
730 off = fdt_next_node(blob, off, &ndepth)) {
732 debug("delete %s: offset: %x\n",
733 fdt_get_name(blob, off, 0), off);
734 ret = fdt_del_node((void *)blob, off);
736 printf("Can't delete node: %s\n",
748 int fdt_del_partitions(void *blob, int parent_offset)
755 off = fdt_next_node(blob, parent_offset, &ndepth);
756 if (off > 0 && ndepth == 1) {
757 prop = fdt_getprop(blob, off, "label", NULL);
760 * Could not find label property, nand {}; node?
761 * Check subnode, delete partitions there if any.
763 return fdt_del_partitions(blob, off);
765 ret = fdt_del_subnodes(blob, parent_offset);
767 printf("Can't remove subnodes: %s\n",
776 int fdt_node_set_part_info(void *blob, int parent_offset,
777 struct mtd_device *dev)
779 struct list_head *pentry;
780 struct part_info *part;
781 struct reg_cell cell;
786 ret = fdt_del_partitions(blob, parent_offset);
791 * Check if it is nand {}; subnode, adjust
792 * the offset in this case
794 off = fdt_next_node(blob, parent_offset, &ndepth);
795 if (off > 0 && ndepth == 1)
799 list_for_each_prev(pentry, &dev->parts) {
802 part = list_entry(pentry, struct part_info, link);
804 debug("%2d: %-20s0x%08llx\t0x%08llx\t%d\n",
805 part_num, part->name, part->size,
806 part->offset, part->mask_flags);
808 sprintf(buf, "partition@%llx", part->offset);
810 ret = fdt_add_subnode(blob, parent_offset, buf);
811 if (ret == -FDT_ERR_NOSPACE) {
812 ret = fdt_increase_size(blob, 512);
817 } else if (ret < 0) {
818 printf("Can't add partition node: %s\n",
824 /* Check MTD_WRITEABLE_CMD flag */
825 if (part->mask_flags & 1) {
827 ret = fdt_setprop(blob, newoff, "read_only", NULL, 0);
828 if (ret == -FDT_ERR_NOSPACE) {
829 ret = fdt_increase_size(blob, 512);
838 cell.r0 = cpu_to_fdt32(part->offset);
839 cell.r1 = cpu_to_fdt32(part->size);
841 ret = fdt_setprop(blob, newoff, "reg", &cell, sizeof(cell));
842 if (ret == -FDT_ERR_NOSPACE) {
843 ret = fdt_increase_size(blob, 512);
852 ret = fdt_setprop_string(blob, newoff, "label", part->name);
853 if (ret == -FDT_ERR_NOSPACE) {
854 ret = fdt_increase_size(blob, 512);
866 printf("Can't increase blob size: %s\n", fdt_strerror(ret));
869 printf("Can't add property: %s\n", fdt_strerror(ret));
874 * Update partitions in nor/nand nodes using info from
875 * mtdparts environment variable. The nodes to update are
876 * specified by node_info structure which contains mtd device
877 * type and compatible string: E. g. the board code in
878 * ft_board_setup() could use:
880 * struct node_info nodes[] = {
881 * { "fsl,mpc5121-nfc", MTD_DEV_TYPE_NAND, },
882 * { "cfi-flash", MTD_DEV_TYPE_NOR, },
885 * fdt_fixup_mtdparts(blob, nodes, ARRAY_SIZE(nodes));
887 void fdt_fixup_mtdparts(void *blob, void *node_info, int node_info_size)
889 struct node_info *ni = node_info;
890 struct mtd_device *dev;
895 parts = getenv("mtdparts");
899 if (mtdparts_init() != 0)
902 for (i = 0; i < node_info_size; i++) {
904 noff = fdt_node_offset_by_compatible(blob, -1, ni[i].compat);
905 while (noff != -FDT_ERR_NOTFOUND) {
906 debug("%s: %s, mtd dev type %d\n",
907 fdt_get_name(blob, noff, 0),
908 ni[i].compat, ni[i].type);
909 dev = device_find(ni[i].type, idx++);
911 if (fdt_node_set_part_info(blob, noff, dev))
912 return; /* return on error */
915 /* Jump to next flash node */
916 noff = fdt_node_offset_by_compatible(blob, noff,
923 void fdt_del_node_and_alias(void *blob, const char *alias)
925 int off = fdt_path_offset(blob, alias);
930 fdt_del_node(blob, off);
932 off = fdt_path_offset(blob, "/aliases");
933 fdt_delprop(blob, off, alias);
936 /* Helper to read a big number; size is in cells (not bytes) */
937 static inline u64 of_read_number(const fdt32_t *cell, int size)
941 r = (r << 32) | fdt32_to_cpu(*(cell++));
947 /* Max address size we deal with */
948 #define OF_MAX_ADDR_CELLS 4
949 #define OF_BAD_ADDR ((u64)-1)
950 #define OF_CHECK_COUNTS(na, ns) ((na) > 0 && (na) <= OF_MAX_ADDR_CELLS && \
955 static void of_dump_addr(const char *s, const fdt32_t *addr, int na)
959 printf(" %08x", *(addr++));
963 static void of_dump_addr(const char *s, const fdt32_t *addr, int na) { }
966 /* Callbacks for bus specific translators */
969 const char *addresses;
970 void (*count_cells)(void *blob, int parentoffset,
971 int *addrc, int *sizec);
972 u64 (*map)(fdt32_t *addr, const fdt32_t *range,
973 int na, int ns, int pna);
974 int (*translate)(fdt32_t *addr, u64 offset, int na);
977 /* Default translator (generic bus) */
978 static void of_bus_default_count_cells(void *blob, int parentoffset,
979 int *addrc, int *sizec)
984 prop = fdt_getprop(blob, parentoffset, "#address-cells", NULL);
986 *addrc = be32_to_cpup(prop);
992 prop = fdt_getprop(blob, parentoffset, "#size-cells", NULL);
994 *sizec = be32_to_cpup(prop);
1000 static u64 of_bus_default_map(fdt32_t *addr, const fdt32_t *range,
1001 int na, int ns, int pna)
1005 cp = of_read_number(range, na);
1006 s = of_read_number(range + na + pna, ns);
1007 da = of_read_number(addr, na);
1009 debug("OF: default map, cp="PRu64", s="PRu64", da="PRu64"\n",
1012 if (da < cp || da >= (cp + s))
1017 static int of_bus_default_translate(fdt32_t *addr, u64 offset, int na)
1019 u64 a = of_read_number(addr, na);
1020 memset(addr, 0, na * 4);
1023 addr[na - 2] = cpu_to_fdt32(a >> 32);
1024 addr[na - 1] = cpu_to_fdt32(a & 0xffffffffu);
1029 /* Array of bus specific translators */
1030 static struct of_bus of_busses[] = {
1035 .count_cells = of_bus_default_count_cells,
1036 .map = of_bus_default_map,
1037 .translate = of_bus_default_translate,
1041 static int of_translate_one(void * blob, int parent, struct of_bus *bus,
1042 struct of_bus *pbus, fdt32_t *addr,
1043 int na, int ns, int pna, const char *rprop)
1045 const fdt32_t *ranges;
1048 u64 offset = OF_BAD_ADDR;
1050 /* Normally, an absence of a "ranges" property means we are
1051 * crossing a non-translatable boundary, and thus the addresses
1052 * below the current not cannot be converted to CPU physical ones.
1053 * Unfortunately, while this is very clear in the spec, it's not
1054 * what Apple understood, and they do have things like /uni-n or
1055 * /ht nodes with no "ranges" property and a lot of perfectly
1056 * useable mapped devices below them. Thus we treat the absence of
1057 * "ranges" as equivalent to an empty "ranges" property which means
1058 * a 1:1 translation at that level. It's up to the caller not to try
1059 * to translate addresses that aren't supposed to be translated in
1060 * the first place. --BenH.
1062 ranges = fdt_getprop(blob, parent, rprop, &rlen);
1063 if (ranges == NULL || rlen == 0) {
1064 offset = of_read_number(addr, na);
1065 memset(addr, 0, pna * 4);
1066 debug("OF: no ranges, 1:1 translation\n");
1070 debug("OF: walking ranges...\n");
1072 /* Now walk through the ranges */
1074 rone = na + pna + ns;
1075 for (; rlen >= rone; rlen -= rone, ranges += rone) {
1076 offset = bus->map(addr, ranges, na, ns, pna);
1077 if (offset != OF_BAD_ADDR)
1080 if (offset == OF_BAD_ADDR) {
1081 debug("OF: not found !\n");
1084 memcpy(addr, ranges + na, 4 * pna);
1087 of_dump_addr("OF: parent translation for:", addr, pna);
1088 debug("OF: with offset: "PRu64"\n", offset);
1090 /* Translate it into parent bus space */
1091 return pbus->translate(addr, offset, pna);
1095 * Translate an address from the device-tree into a CPU physical address,
1096 * this walks up the tree and applies the various bus mappings on the
1099 * Note: We consider that crossing any level with #size-cells == 0 to mean
1100 * that translation is impossible (that is we are not dealing with a value
1101 * that can be mapped to a cpu physical address). This is not really specified
1102 * that way, but this is traditionally the way IBM at least do things
1104 static u64 __of_translate_address(void *blob, int node_offset, const fdt32_t *in_addr,
1108 struct of_bus *bus, *pbus;
1109 fdt32_t addr[OF_MAX_ADDR_CELLS];
1110 int na, ns, pna, pns;
1111 u64 result = OF_BAD_ADDR;
1113 debug("OF: ** translation for device %s **\n",
1114 fdt_get_name(blob, node_offset, NULL));
1116 /* Get parent & match bus type */
1117 parent = fdt_parent_offset(blob, node_offset);
1120 bus = &of_busses[0];
1122 /* Cound address cells & copy address locally */
1123 bus->count_cells(blob, parent, &na, &ns);
1124 if (!OF_CHECK_COUNTS(na, ns)) {
1125 printf("%s: Bad cell count for %s\n", __FUNCTION__,
1126 fdt_get_name(blob, node_offset, NULL));
1129 memcpy(addr, in_addr, na * 4);
1131 debug("OF: bus is %s (na=%d, ns=%d) on %s\n",
1132 bus->name, na, ns, fdt_get_name(blob, parent, NULL));
1133 of_dump_addr("OF: translating address:", addr, na);
1137 /* Switch to parent bus */
1138 node_offset = parent;
1139 parent = fdt_parent_offset(blob, node_offset);
1141 /* If root, we have finished */
1143 debug("OF: reached root node\n");
1144 result = of_read_number(addr, na);
1148 /* Get new parent bus and counts */
1149 pbus = &of_busses[0];
1150 pbus->count_cells(blob, parent, &pna, &pns);
1151 if (!OF_CHECK_COUNTS(pna, pns)) {
1152 printf("%s: Bad cell count for %s\n", __FUNCTION__,
1153 fdt_get_name(blob, node_offset, NULL));
1157 debug("OF: parent bus is %s (na=%d, ns=%d) on %s\n",
1158 pbus->name, pna, pns, fdt_get_name(blob, parent, NULL));
1160 /* Apply bus translation */
1161 if (of_translate_one(blob, node_offset, bus, pbus,
1162 addr, na, ns, pna, rprop))
1165 /* Complete the move up one level */
1170 of_dump_addr("OF: one level translation:", addr, na);
1177 u64 fdt_translate_address(void *blob, int node_offset, const fdt32_t *in_addr)
1179 return __of_translate_address(blob, node_offset, in_addr, "ranges");
1183 * fdt_node_offset_by_compat_reg: Find a node that matches compatiable and
1184 * who's reg property matches a physical cpu address
1186 * @blob: ptr to device tree
1187 * @compat: compatiable string to match
1188 * @compat_off: property name
1191 int fdt_node_offset_by_compat_reg(void *blob, const char *compat,
1192 phys_addr_t compat_off)
1194 int len, off = fdt_node_offset_by_compatible(blob, -1, compat);
1195 while (off != -FDT_ERR_NOTFOUND) {
1196 const fdt32_t *reg = fdt_getprop(blob, off, "reg", &len);
1198 if (compat_off == fdt_translate_address(blob, off, reg))
1201 off = fdt_node_offset_by_compatible(blob, off, compat);
1204 return -FDT_ERR_NOTFOUND;
1208 * fdt_alloc_phandle: Return next free phandle value
1210 * @blob: ptr to device tree
1212 int fdt_alloc_phandle(void *blob)
1214 int offset, phandle = 0;
1216 for (offset = fdt_next_node(blob, -1, NULL); offset >= 0;
1217 offset = fdt_next_node(blob, offset, NULL)) {
1218 phandle = max(phandle, fdt_get_phandle(blob, offset));
1225 * fdt_set_phandle: Create a phandle property for the given node
1227 * @fdt: ptr to device tree
1228 * @nodeoffset: node to update
1229 * @phandle: phandle value to set (must be unique)
1231 int fdt_set_phandle(void *fdt, int nodeoffset, uint32_t phandle)
1236 int off = fdt_node_offset_by_phandle(fdt, phandle);
1238 if ((off >= 0) && (off != nodeoffset)) {
1241 fdt_get_path(fdt, nodeoffset, buf, sizeof(buf));
1242 printf("Trying to update node %s with phandle %u ",
1245 fdt_get_path(fdt, off, buf, sizeof(buf));
1246 printf("that already exists in node %s.\n", buf);
1247 return -FDT_ERR_BADPHANDLE;
1251 ret = fdt_setprop_cell(fdt, nodeoffset, "phandle", phandle);
1256 * For now, also set the deprecated "linux,phandle" property, so that we
1257 * don't break older kernels.
1259 ret = fdt_setprop_cell(fdt, nodeoffset, "linux,phandle", phandle);
1265 * fdt_create_phandle: Create a phandle property for the given node
1267 * @fdt: ptr to device tree
1268 * @nodeoffset: node to update
1270 unsigned int fdt_create_phandle(void *fdt, int nodeoffset)
1272 /* see if there is a phandle already */
1273 int phandle = fdt_get_phandle(fdt, nodeoffset);
1275 /* if we got 0, means no phandle so create one */
1279 phandle = fdt_alloc_phandle(fdt);
1280 ret = fdt_set_phandle(fdt, nodeoffset, phandle);
1282 printf("Can't set phandle %u: %s\n", phandle,
1292 * fdt_set_node_status: Set status for the given node
1294 * @fdt: ptr to device tree
1295 * @nodeoffset: node to update
1296 * @status: FDT_STATUS_OKAY, FDT_STATUS_DISABLED,
1297 * FDT_STATUS_FAIL, FDT_STATUS_FAIL_ERROR_CODE
1298 * @error_code: optional, only used if status is FDT_STATUS_FAIL_ERROR_CODE
1300 int fdt_set_node_status(void *fdt, int nodeoffset,
1301 enum fdt_status status, unsigned int error_code)
1310 case FDT_STATUS_OKAY:
1311 ret = fdt_setprop_string(fdt, nodeoffset, "status", "okay");
1313 case FDT_STATUS_DISABLED:
1314 ret = fdt_setprop_string(fdt, nodeoffset, "status", "disabled");
1316 case FDT_STATUS_FAIL:
1317 ret = fdt_setprop_string(fdt, nodeoffset, "status", "fail");
1319 case FDT_STATUS_FAIL_ERROR_CODE:
1320 sprintf(buf, "fail-%d", error_code);
1321 ret = fdt_setprop_string(fdt, nodeoffset, "status", buf);
1324 printf("Invalid fdt status: %x\n", status);
1333 * fdt_set_status_by_alias: Set status for the given node given an alias
1335 * @fdt: ptr to device tree
1336 * @alias: alias of node to update
1337 * @status: FDT_STATUS_OKAY, FDT_STATUS_DISABLED,
1338 * FDT_STATUS_FAIL, FDT_STATUS_FAIL_ERROR_CODE
1339 * @error_code: optional, only used if status is FDT_STATUS_FAIL_ERROR_CODE
1341 int fdt_set_status_by_alias(void *fdt, const char* alias,
1342 enum fdt_status status, unsigned int error_code)
1344 int offset = fdt_path_offset(fdt, alias);
1346 return fdt_set_node_status(fdt, offset, status, error_code);
1349 #if defined(CONFIG_VIDEO) || defined(CONFIG_LCD)
1350 int fdt_add_edid(void *blob, const char *compat, unsigned char *edid_buf)
1355 noff = fdt_node_offset_by_compatible(blob, -1, compat);
1356 if (noff != -FDT_ERR_NOTFOUND) {
1357 debug("%s: %s\n", fdt_get_name(blob, noff, 0), compat);
1359 ret = fdt_setprop(blob, noff, "edid", edid_buf, 128);
1360 if (ret == -FDT_ERR_NOSPACE) {
1361 ret = fdt_increase_size(blob, 512);
1366 } else if (ret < 0) {
1367 printf("Can't add property: %s\n", fdt_strerror(ret));
1373 printf("Can't increase blob size: %s\n", fdt_strerror(ret));
1379 * Verify the physical address of device tree node for a given alias
1381 * This function locates the device tree node of a given alias, and then
1382 * verifies that the physical address of that device matches the given
1383 * parameter. It displays a message if there is a mismatch.
1385 * Returns 1 on success, 0 on failure
1387 int fdt_verify_alias_address(void *fdt, int anode, const char *alias, u64 addr)
1394 path = fdt_getprop(fdt, anode, alias, NULL);
1396 /* If there's no such alias, then it's not a failure */
1400 node = fdt_path_offset(fdt, path);
1402 printf("Warning: device tree alias '%s' points to invalid "
1403 "node %s.\n", alias, path);
1407 reg = fdt_getprop(fdt, node, "reg", &len);
1409 printf("Warning: device tree node '%s' has no address.\n",
1414 dt_addr = fdt_translate_address(fdt, node, reg);
1415 if (addr != dt_addr) {
1416 printf("Warning: U-Boot configured device %s at address %llx,\n"
1417 " but the device tree has it address %llx.\n",
1418 alias, addr, dt_addr);
1426 * Returns the base address of an SOC or PCI node
1428 u64 fdt_get_base_address(void *fdt, int node)
1432 const fdt32_t *prop;
1434 prop = fdt_getprop(fdt, node, "#address-cells", &size);
1435 if (prop && size == 4)
1436 naddr = be32_to_cpup(prop);
1440 prop = fdt_getprop(fdt, node, "ranges", &size);
1442 return prop ? fdt_translate_address(fdt, node, prop + naddr) : 0;
1446 * Read a property of size <prop_len>. Currently only supports 1 or 2 cells.
1448 static int fdt_read_prop(const fdt32_t *prop, int prop_len, int cell_off,
1449 uint64_t *val, int cells)
1451 const fdt32_t *prop32 = &prop[cell_off];
1452 const fdt64_t *prop64 = (const fdt64_t *)&prop[cell_off];
1454 if ((cell_off + cells) > prop_len)
1455 return -FDT_ERR_NOSPACE;
1459 *val = fdt32_to_cpu(*prop32);
1462 *val = fdt64_to_cpu(*prop64);
1465 return -FDT_ERR_NOSPACE;
1472 * fdt_read_range - Read a node's n'th range property
1474 * @fdt: ptr to device tree
1475 * @node: offset of node
1477 * @child_addr: pointer to storage for the "child address" field
1478 * @addr: pointer to storage for the CPU view translated physical start
1479 * @len: pointer to storage for the range length
1481 * Convenience function that reads and interprets a specific range out of
1482 * a number of the "ranges" property array.
1484 int fdt_read_range(void *fdt, int node, int n, uint64_t *child_addr,
1485 uint64_t *addr, uint64_t *len)
1487 int pnode = fdt_parent_offset(fdt, node);
1488 const fdt32_t *ranges;
1497 * The "ranges" property is an array of
1498 * { <child address> <parent address> <size in child address space> }
1500 * All 3 elements can span a diffent number of cells. Fetch their size.
1502 pacells = fdt_getprop_u32_default_node(fdt, pnode, 0, "#address-cells", 1);
1503 acells = fdt_getprop_u32_default_node(fdt, node, 0, "#address-cells", 1);
1504 scells = fdt_getprop_u32_default_node(fdt, node, 0, "#size-cells", 1);
1506 /* Now try to get the ranges property */
1507 ranges = fdt_getprop(fdt, node, "ranges", &ranges_len);
1509 return -FDT_ERR_NOTFOUND;
1510 ranges_len /= sizeof(uint32_t);
1512 /* Jump to the n'th entry */
1513 cell = n * (pacells + acells + scells);
1515 /* Read <child address> */
1517 r = fdt_read_prop(ranges, ranges_len, cell, child_addr,
1524 /* Read <parent address> */
1526 *addr = fdt_translate_address(fdt, node, ranges + cell);
1529 /* Read <size in child address space> */
1531 r = fdt_read_prop(ranges, ranges_len, cell, len, scells);