3 * Gerald Van Baren, Custom IDEAS, vanbaren@cideas.com
5 * Copyright 2010 Freescale Semiconductor, Inc.
7 * See file CREDITS for list of people who contributed to this
10 * This program is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public License as
12 * published by the Free Software Foundation; either version 2 of
13 * the License, or (at your option) any later version.
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
27 #include <stdio_dev.h>
28 #include <linux/ctype.h>
29 #include <linux/types.h>
30 #include <asm/global_data.h>
33 #include <fdt_support.h>
37 * Global data (for the gd->bd)
39 DECLARE_GLOBAL_DATA_PTR;
42 * fdt_getprop_u32_default - Find a node and return it's property or a default
44 * @fdt: ptr to device tree
46 * @prop: property name
47 * @dflt: default value if the property isn't found
49 * Convenience function to find a node and return it's property or a
50 * default value if it doesn't exist.
52 u32 fdt_getprop_u32_default(void *fdt, const char *path, const char *prop,
58 off = fdt_path_offset(fdt, path);
62 val = fdt_getprop(fdt, off, prop, NULL);
70 * fdt_find_and_setprop: Find a node and set it's property
72 * @fdt: ptr to device tree
74 * @prop: property name
75 * @val: ptr to new value
76 * @len: length of new property value
77 * @create: flag to create the property if it doesn't exist
79 * Convenience function to directly set a property given the path to the node.
81 int fdt_find_and_setprop(void *fdt, const char *node, const char *prop,
82 const void *val, int len, int create)
84 int nodeoff = fdt_path_offset(fdt, node);
89 if ((!create) && (fdt_get_property(fdt, nodeoff, prop, 0) == NULL))
90 return 0; /* create flag not set; so exit quietly */
92 return fdt_setprop(fdt, nodeoff, prop, val, len);
95 #ifdef CONFIG_OF_STDOUT_VIA_ALIAS
97 #ifdef CONFIG_SERIAL_MULTI
98 static void fdt_fill_multisername(char *sername, size_t maxlen)
100 const char *outname = stdio_devices[stdout]->name;
102 if (strcmp(outname, "serial") > 0)
103 strncpy(sername, outname, maxlen);
106 if (strcmp(outname + 1, "serial") > 0)
107 strncpy(sername, outname + 1, maxlen);
110 static inline void fdt_fill_multisername(char *sername, size_t maxlen) {}
111 #endif /* CONFIG_SERIAL_MULTI */
113 static int fdt_fixup_stdout(void *fdt, int chosenoff)
116 #ifdef CONFIG_CONS_INDEX
118 char sername[9] = { 0 };
121 fdt_fill_multisername(sername, sizeof(sername) - 1);
123 sprintf(sername, "serial%d", CONFIG_CONS_INDEX - 1);
125 err = node = fdt_path_offset(fdt, "/aliases");
128 path = fdt_getprop(fdt, node, sername, &len);
130 char *p = malloc(len);
131 err = -FDT_ERR_NOSPACE;
133 memcpy(p, path, len);
134 err = fdt_setprop(fdt, chosenoff,
135 "linux,stdout-path", p, len);
144 printf("WARNING: could not set linux,stdout-path %s.\n",
151 int fdt_initrd(void *fdt, ulong initrd_start, ulong initrd_end, int force)
159 /* Find the "chosen" node. */
160 nodeoffset = fdt_path_offset (fdt, "/chosen");
162 /* If there is no "chosen" node in the blob return */
163 if (nodeoffset < 0) {
164 printf("fdt_initrd: %s\n", fdt_strerror(nodeoffset));
168 /* just return if initrd_start/end aren't valid */
169 if ((initrd_start == 0) || (initrd_end == 0))
172 total = fdt_num_mem_rsv(fdt);
175 * Look for an existing entry and update it. If we don't find
176 * the entry, we will j be the next available slot.
178 for (j = 0; j < total; j++) {
179 err = fdt_get_mem_rsv(fdt, j, &addr, &size);
180 if (addr == initrd_start) {
181 fdt_del_mem_rsv(fdt, j);
186 err = fdt_add_mem_rsv(fdt, initrd_start, initrd_end - initrd_start);
188 printf("fdt_initrd: %s\n", fdt_strerror(err));
192 path = fdt_getprop(fdt, nodeoffset, "linux,initrd-start", NULL);
193 if ((path == NULL) || force) {
194 tmp = __cpu_to_be32(initrd_start);
195 err = fdt_setprop(fdt, nodeoffset,
196 "linux,initrd-start", &tmp, sizeof(tmp));
199 "could not set linux,initrd-start %s.\n",
203 tmp = __cpu_to_be32(initrd_end);
204 err = fdt_setprop(fdt, nodeoffset,
205 "linux,initrd-end", &tmp, sizeof(tmp));
207 printf("WARNING: could not set linux,initrd-end %s.\n",
217 int fdt_chosen(void *fdt, int force)
221 char *str; /* used to set string properties */
224 err = fdt_check_header(fdt);
226 printf("fdt_chosen: %s\n", fdt_strerror(err));
231 * Find the "chosen" node.
233 nodeoffset = fdt_path_offset (fdt, "/chosen");
236 * If there is no "chosen" node in the blob, create it.
238 if (nodeoffset < 0) {
240 * Create a new node "/chosen" (offset 0 is root level)
242 nodeoffset = fdt_add_subnode(fdt, 0, "chosen");
243 if (nodeoffset < 0) {
244 printf("WARNING: could not create /chosen %s.\n",
245 fdt_strerror(nodeoffset));
251 * Create /chosen properites that don't exist in the fdt.
252 * If the property exists, update it only if the "force" parameter
255 str = getenv("bootargs");
257 path = fdt_getprop(fdt, nodeoffset, "bootargs", NULL);
258 if ((path == NULL) || force) {
259 err = fdt_setprop(fdt, nodeoffset,
260 "bootargs", str, strlen(str)+1);
262 printf("WARNING: could not set bootargs %s.\n",
267 #ifdef CONFIG_OF_STDOUT_VIA_ALIAS
268 path = fdt_getprop(fdt, nodeoffset, "linux,stdout-path", NULL);
269 if ((path == NULL) || force)
270 err = fdt_fixup_stdout(fdt, nodeoffset);
273 #ifdef OF_STDOUT_PATH
274 path = fdt_getprop(fdt, nodeoffset, "linux,stdout-path", NULL);
275 if ((path == NULL) || force) {
276 err = fdt_setprop(fdt, nodeoffset,
277 "linux,stdout-path", OF_STDOUT_PATH, strlen(OF_STDOUT_PATH)+1);
279 printf("WARNING: could not set linux,stdout-path %s.\n",
287 void do_fixup_by_path(void *fdt, const char *path, const char *prop,
288 const void *val, int len, int create)
292 debug("Updating property '%s/%s' = ", path, prop);
293 for (i = 0; i < len; i++)
294 debug(" %.2x", *(u8*)(val+i));
297 int rc = fdt_find_and_setprop(fdt, path, prop, val, len, create);
299 printf("Unable to update property %s:%s, err=%s\n",
300 path, prop, fdt_strerror(rc));
303 void do_fixup_by_path_u32(void *fdt, const char *path, const char *prop,
306 val = cpu_to_fdt32(val);
307 do_fixup_by_path(fdt, path, prop, &val, sizeof(val), create);
310 void do_fixup_by_prop(void *fdt,
311 const char *pname, const void *pval, int plen,
312 const char *prop, const void *val, int len,
318 debug("Updating property '%s' = ", prop);
319 for (i = 0; i < len; i++)
320 debug(" %.2x", *(u8*)(val+i));
323 off = fdt_node_offset_by_prop_value(fdt, -1, pname, pval, plen);
324 while (off != -FDT_ERR_NOTFOUND) {
325 if (create || (fdt_get_property(fdt, off, prop, 0) != NULL))
326 fdt_setprop(fdt, off, prop, val, len);
327 off = fdt_node_offset_by_prop_value(fdt, off, pname, pval, plen);
331 void do_fixup_by_prop_u32(void *fdt,
332 const char *pname, const void *pval, int plen,
333 const char *prop, u32 val, int create)
335 val = cpu_to_fdt32(val);
336 do_fixup_by_prop(fdt, pname, pval, plen, prop, &val, 4, create);
339 void do_fixup_by_compat(void *fdt, const char *compat,
340 const char *prop, const void *val, int len, int create)
345 debug("Updating property '%s' = ", prop);
346 for (i = 0; i < len; i++)
347 debug(" %.2x", *(u8*)(val+i));
350 off = fdt_node_offset_by_compatible(fdt, -1, compat);
351 while (off != -FDT_ERR_NOTFOUND) {
352 if (create || (fdt_get_property(fdt, off, prop, 0) != NULL))
353 fdt_setprop(fdt, off, prop, val, len);
354 off = fdt_node_offset_by_compatible(fdt, off, compat);
358 void do_fixup_by_compat_u32(void *fdt, const char *compat,
359 const char *prop, u32 val, int create)
361 val = cpu_to_fdt32(val);
362 do_fixup_by_compat(fdt, compat, prop, &val, 4, create);
366 * Get cells len in bytes
367 * if #NNNN-cells property is 2 then len is 8
370 static int get_cells_len(void *blob, char *nr_cells_name)
374 cell = fdt_getprop(blob, 0, nr_cells_name, NULL);
375 if (cell && *cell == 2)
382 * Write a 4 or 8 byte big endian cell
384 static void write_cell(u8 *addr, u64 val, int size)
386 int shift = (size - 1) * 8;
388 *addr++ = (val >> shift) & 0xff;
393 int fdt_fixup_memory_banks(void *blob, u64 start[], u64 size[], int banks)
396 int addr_cell_len, size_cell_len, len;
397 u8 tmp[banks * 16]; /* Up to 64-bit address + 64-bit size */
400 err = fdt_check_header(blob);
402 printf("%s: %s\n", __FUNCTION__, fdt_strerror(err));
406 /* update, or add and update /memory node */
407 nodeoffset = fdt_path_offset(blob, "/memory");
408 if (nodeoffset < 0) {
409 nodeoffset = fdt_add_subnode(blob, 0, "memory");
411 printf("WARNING: could not create /memory: %s.\n",
412 fdt_strerror(nodeoffset));
415 err = fdt_setprop(blob, nodeoffset, "device_type", "memory",
418 printf("WARNING: could not set %s %s.\n", "device_type",
423 addr_cell_len = get_cells_len(blob, "#address-cells");
424 size_cell_len = get_cells_len(blob, "#size-cells");
426 for (bank = 0, len = 0; bank < banks; bank++) {
427 write_cell(tmp + len, start[bank], addr_cell_len);
428 len += addr_cell_len;
430 write_cell(tmp + len, size[bank], size_cell_len);
431 len += size_cell_len;
434 err = fdt_setprop(blob, nodeoffset, "reg", tmp, len);
436 printf("WARNING: could not set %s %s.\n",
437 "reg", fdt_strerror(err));
443 int fdt_fixup_memory(void *blob, u64 start, u64 size)
445 return fdt_fixup_memory_banks(blob, &start, &size, 1);
448 void fdt_fixup_ethernet(void *fdt)
451 char enet[16], *tmp, *end;
452 char mac[16] = "ethaddr";
454 unsigned char mac_addr[6];
456 node = fdt_path_offset(fdt, "/aliases");
461 while ((tmp = getenv(mac)) != NULL) {
462 sprintf(enet, "ethernet%d", i);
463 path = fdt_getprop(fdt, node, enet, NULL);
465 debug("No alias for %s\n", enet);
466 sprintf(mac, "eth%daddr", ++i);
470 for (j = 0; j < 6; j++) {
471 mac_addr[j] = tmp ? simple_strtoul(tmp, &end, 16) : 0;
473 tmp = (*end) ? end+1 : end;
476 do_fixup_by_path(fdt, path, "mac-address", &mac_addr, 6, 0);
477 do_fixup_by_path(fdt, path, "local-mac-address",
480 sprintf(mac, "eth%daddr", ++i);
484 /* Resize the fdt to its actual size + a bit of padding */
485 int fdt_resize(void *blob)
495 total = fdt_num_mem_rsv(blob);
496 for (i = 0; i < total; i++) {
497 fdt_get_mem_rsv(blob, i, &addr, &size);
498 if (addr == (uint64_t)(u32)blob) {
499 fdt_del_mem_rsv(blob, i);
505 * Calculate the actual size of the fdt
506 * plus the size needed for 5 fdt_add_mem_rsv, one
507 * for the fdt itself and 4 for a possible initrd
508 * ((initrd-start + initrd-end) * 2 (name & value))
510 actualsize = fdt_off_dt_strings(blob) +
511 fdt_size_dt_strings(blob) + 5 * sizeof(struct fdt_reserve_entry);
513 /* Make it so the fdt ends on a page boundary */
514 actualsize = ALIGN(actualsize + ((uint)blob & 0xfff), 0x1000);
515 actualsize = actualsize - ((uint)blob & 0xfff);
517 /* Change the fdt header to reflect the correct size */
518 fdt_set_totalsize(blob, actualsize);
520 /* Add the new reservation */
521 ret = fdt_add_mem_rsv(blob, (uint)blob, actualsize);
529 #define CONFIG_SYS_PCI_NR_INBOUND_WIN 4
531 #define FDT_PCI_PREFETCH (0x40000000)
532 #define FDT_PCI_MEM32 (0x02000000)
533 #define FDT_PCI_IO (0x01000000)
534 #define FDT_PCI_MEM64 (0x03000000)
536 int fdt_pci_dma_ranges(void *blob, int phb_off, struct pci_controller *hose) {
538 int addrcell, sizecell, len, r;
540 /* sized based on pci addr cells, size-cells, & address-cells */
541 u32 dma_ranges[(3 + 2 + 2) * CONFIG_SYS_PCI_NR_INBOUND_WIN];
543 addrcell = fdt_getprop_u32_default(blob, "/", "#address-cells", 1);
544 sizecell = fdt_getprop_u32_default(blob, "/", "#size-cells", 1);
546 dma_range = &dma_ranges[0];
547 for (r = 0; r < hose->region_count; r++) {
548 u64 bus_start, phys_start, size;
550 /* skip if !PCI_REGION_SYS_MEMORY */
551 if (!(hose->regions[r].flags & PCI_REGION_SYS_MEMORY))
554 bus_start = (u64)hose->regions[r].bus_start;
555 phys_start = (u64)hose->regions[r].phys_start;
556 size = (u64)hose->regions[r].size;
559 if (size >= 0x100000000ull)
560 dma_range[0] |= FDT_PCI_MEM64;
562 dma_range[0] |= FDT_PCI_MEM32;
563 if (hose->regions[r].flags & PCI_REGION_PREFETCH)
564 dma_range[0] |= FDT_PCI_PREFETCH;
565 #ifdef CONFIG_SYS_PCI_64BIT
566 dma_range[1] = bus_start >> 32;
570 dma_range[2] = bus_start & 0xffffffff;
573 dma_range[3] = phys_start >> 32;
574 dma_range[4] = phys_start & 0xffffffff;
576 dma_range[3] = phys_start & 0xffffffff;
580 dma_range[3 + addrcell + 0] = size >> 32;
581 dma_range[3 + addrcell + 1] = size & 0xffffffff;
583 dma_range[3 + addrcell + 0] = size & 0xffffffff;
586 dma_range += (3 + addrcell + sizecell);
589 len = dma_range - &dma_ranges[0];
591 fdt_setprop(blob, phb_off, "dma-ranges", &dma_ranges[0], len*4);
597 #ifdef CONFIG_FDT_FIXUP_NOR_FLASH_SIZE
599 * Provide a weak default function to return the flash bank size.
600 * There might be multiple non-identical flash chips connected to one
601 * chip-select, so we need to pass an index as well.
603 u32 __flash_get_bank_size(int cs, int idx)
605 extern flash_info_t flash_info[];
608 * As default, a simple 1:1 mapping is provided. Boards with
609 * a different mapping need to supply a board specific mapping
612 return flash_info[cs].size;
614 u32 flash_get_bank_size(int cs, int idx)
615 __attribute__((weak, alias("__flash_get_bank_size")));
618 * This function can be used to update the size in the "reg" property
619 * of all NOR FLASH device nodes. This is necessary for boards with
620 * non-fixed NOR FLASH sizes.
622 int fdt_fixup_nor_flash_size(void *blob)
624 char compat[][16] = { "cfi-flash", "jedec-flash" };
627 struct fdt_property *prop;
631 for (i = 0; i < 2; i++) {
632 off = fdt_node_offset_by_compatible(blob, -1, compat[i]);
633 while (off != -FDT_ERR_NOTFOUND) {
637 * Found one compatible node, so fixup the size
638 * int its reg properties
640 prop = fdt_get_property_w(blob, off, "reg", &len);
642 int tuple_size = 3 * sizeof(reg);
645 * There might be multiple reg-tuples,
646 * so loop through them all
648 reg = reg2 = (u32 *)&prop->data[0];
649 for (idx = 0; idx < (len / tuple_size); idx++) {
651 * Update size in reg property
653 reg[2] = flash_get_bank_size(reg[0],
657 * Point to next reg tuple
662 fdt_setprop(blob, off, "reg", reg2, len);
665 /* Move to next compatible node */
666 off = fdt_node_offset_by_compatible(blob, off,
675 int fdt_increase_size(void *fdt, int add_len)
679 newlen = fdt_totalsize(fdt) + add_len;
681 /* Open in place with a new len */
682 return fdt_open_into(fdt, fdt, newlen);
685 #ifdef CONFIG_FDT_FIXUP_PARTITIONS
686 #include <jffs2/load_kernel.h>
687 #include <mtd_node.h>
694 int fdt_del_subnodes(const void *blob, int parent_offset)
699 for (ndepth = 0, off = fdt_next_node(blob, parent_offset, &ndepth);
700 (off >= 0) && (ndepth > 0);
701 off = fdt_next_node(blob, off, &ndepth)) {
703 debug("delete %s: offset: %x\n",
704 fdt_get_name(blob, off, 0), off);
705 ret = fdt_del_node((void *)blob, off);
707 printf("Can't delete node: %s\n",
719 int fdt_del_partitions(void *blob, int parent_offset)
726 off = fdt_next_node(blob, parent_offset, &ndepth);
727 if (off > 0 && ndepth == 1) {
728 prop = fdt_getprop(blob, off, "label", NULL);
731 * Could not find label property, nand {}; node?
732 * Check subnode, delete partitions there if any.
734 return fdt_del_partitions(blob, off);
736 ret = fdt_del_subnodes(blob, parent_offset);
738 printf("Can't remove subnodes: %s\n",
747 int fdt_node_set_part_info(void *blob, int parent_offset,
748 struct mtd_device *dev)
750 struct list_head *pentry;
751 struct part_info *part;
752 struct reg_cell cell;
757 ret = fdt_del_partitions(blob, parent_offset);
762 * Check if it is nand {}; subnode, adjust
763 * the offset in this case
765 off = fdt_next_node(blob, parent_offset, &ndepth);
766 if (off > 0 && ndepth == 1)
770 list_for_each_prev(pentry, &dev->parts) {
773 part = list_entry(pentry, struct part_info, link);
775 debug("%2d: %-20s0x%08x\t0x%08x\t%d\n",
776 part_num, part->name, part->size,
777 part->offset, part->mask_flags);
779 sprintf(buf, "partition@%x", part->offset);
781 ret = fdt_add_subnode(blob, parent_offset, buf);
782 if (ret == -FDT_ERR_NOSPACE) {
783 ret = fdt_increase_size(blob, 512);
788 } else if (ret < 0) {
789 printf("Can't add partition node: %s\n",
795 /* Check MTD_WRITEABLE_CMD flag */
796 if (part->mask_flags & 1) {
798 ret = fdt_setprop(blob, newoff, "read_only", NULL, 0);
799 if (ret == -FDT_ERR_NOSPACE) {
800 ret = fdt_increase_size(blob, 512);
809 cell.r0 = cpu_to_fdt32(part->offset);
810 cell.r1 = cpu_to_fdt32(part->size);
812 ret = fdt_setprop(blob, newoff, "reg", &cell, sizeof(cell));
813 if (ret == -FDT_ERR_NOSPACE) {
814 ret = fdt_increase_size(blob, 512);
823 ret = fdt_setprop_string(blob, newoff, "label", part->name);
824 if (ret == -FDT_ERR_NOSPACE) {
825 ret = fdt_increase_size(blob, 512);
837 printf("Can't increase blob size: %s\n", fdt_strerror(ret));
840 printf("Can't add property: %s\n", fdt_strerror(ret));
845 * Update partitions in nor/nand nodes using info from
846 * mtdparts environment variable. The nodes to update are
847 * specified by node_info structure which contains mtd device
848 * type and compatible string: E. g. the board code in
849 * ft_board_setup() could use:
851 * struct node_info nodes[] = {
852 * { "fsl,mpc5121-nfc", MTD_DEV_TYPE_NAND, },
853 * { "cfi-flash", MTD_DEV_TYPE_NOR, },
856 * fdt_fixup_mtdparts(blob, nodes, ARRAY_SIZE(nodes));
858 void fdt_fixup_mtdparts(void *blob, void *node_info, int node_info_size)
860 struct node_info *ni = node_info;
861 struct mtd_device *dev;
866 parts = getenv("mtdparts");
870 if (mtdparts_init() != 0)
873 for (i = 0; i < node_info_size; i++) {
875 noff = fdt_node_offset_by_compatible(blob, -1, ni[i].compat);
876 while (noff != -FDT_ERR_NOTFOUND) {
877 debug("%s: %s, mtd dev type %d\n",
878 fdt_get_name(blob, noff, 0),
879 ni[i].compat, ni[i].type);
880 dev = device_find(ni[i].type, idx++);
882 if (fdt_node_set_part_info(blob, noff, dev))
883 return; /* return on error */
886 /* Jump to next flash node */
887 noff = fdt_node_offset_by_compatible(blob, noff,
894 void fdt_del_node_and_alias(void *blob, const char *alias)
896 int off = fdt_path_offset(blob, alias);
901 fdt_del_node(blob, off);
903 off = fdt_path_offset(blob, "/aliases");
904 fdt_delprop(blob, off, alias);
907 /* Helper to read a big number; size is in cells (not bytes) */
908 static inline u64 of_read_number(const __be32 *cell, int size)
912 r = (r << 32) | be32_to_cpu(*(cell++));
918 /* Max address size we deal with */
919 #define OF_MAX_ADDR_CELLS 4
920 #define OF_BAD_ADDR ((u64)-1)
921 #define OF_CHECK_COUNTS(na, ns) ((na) > 0 && (na) <= OF_MAX_ADDR_CELLS && \
926 static void of_dump_addr(const char *s, const u32 *addr, int na)
930 printf(" %08x", *(addr++));
934 static void of_dump_addr(const char *s, const u32 *addr, int na) { }
937 /* Callbacks for bus specific translators */
940 const char *addresses;
941 void (*count_cells)(void *blob, int parentoffset,
942 int *addrc, int *sizec);
943 u64 (*map)(u32 *addr, const u32 *range,
944 int na, int ns, int pna);
945 int (*translate)(u32 *addr, u64 offset, int na);
948 /* Default translator (generic bus) */
949 static void of_bus_default_count_cells(void *blob, int parentoffset,
950 int *addrc, int *sizec)
955 prop = fdt_getprop(blob, parentoffset, "#address-cells", NULL);
957 *addrc = be32_to_cpup((u32 *)prop);
963 prop = fdt_getprop(blob, parentoffset, "#size-cells", NULL);
965 *sizec = be32_to_cpup((u32 *)prop);
971 static u64 of_bus_default_map(u32 *addr, const u32 *range,
972 int na, int ns, int pna)
976 cp = of_read_number(range, na);
977 s = of_read_number(range + na + pna, ns);
978 da = of_read_number(addr, na);
980 debug("OF: default map, cp="PRu64", s="PRu64", da="PRu64"\n",
983 if (da < cp || da >= (cp + s))
988 static int of_bus_default_translate(u32 *addr, u64 offset, int na)
990 u64 a = of_read_number(addr, na);
991 memset(addr, 0, na * 4);
994 addr[na - 2] = a >> 32;
995 addr[na - 1] = a & 0xffffffffu;
1000 /* Array of bus specific translators */
1001 static struct of_bus of_busses[] = {
1006 .count_cells = of_bus_default_count_cells,
1007 .map = of_bus_default_map,
1008 .translate = of_bus_default_translate,
1012 static int of_translate_one(void * blob, int parent, struct of_bus *bus,
1013 struct of_bus *pbus, u32 *addr,
1014 int na, int ns, int pna, const char *rprop)
1019 u64 offset = OF_BAD_ADDR;
1021 /* Normally, an absence of a "ranges" property means we are
1022 * crossing a non-translatable boundary, and thus the addresses
1023 * below the current not cannot be converted to CPU physical ones.
1024 * Unfortunately, while this is very clear in the spec, it's not
1025 * what Apple understood, and they do have things like /uni-n or
1026 * /ht nodes with no "ranges" property and a lot of perfectly
1027 * useable mapped devices below them. Thus we treat the absence of
1028 * "ranges" as equivalent to an empty "ranges" property which means
1029 * a 1:1 translation at that level. It's up to the caller not to try
1030 * to translate addresses that aren't supposed to be translated in
1031 * the first place. --BenH.
1033 ranges = (u32 *)fdt_getprop(blob, parent, rprop, &rlen);
1034 if (ranges == NULL || rlen == 0) {
1035 offset = of_read_number(addr, na);
1036 memset(addr, 0, pna * 4);
1037 debug("OF: no ranges, 1:1 translation\n");
1041 debug("OF: walking ranges...\n");
1043 /* Now walk through the ranges */
1045 rone = na + pna + ns;
1046 for (; rlen >= rone; rlen -= rone, ranges += rone) {
1047 offset = bus->map(addr, ranges, na, ns, pna);
1048 if (offset != OF_BAD_ADDR)
1051 if (offset == OF_BAD_ADDR) {
1052 debug("OF: not found !\n");
1055 memcpy(addr, ranges + na, 4 * pna);
1058 of_dump_addr("OF: parent translation for:", addr, pna);
1059 debug("OF: with offset: "PRu64"\n", offset);
1061 /* Translate it into parent bus space */
1062 return pbus->translate(addr, offset, pna);
1066 * Translate an address from the device-tree into a CPU physical address,
1067 * this walks up the tree and applies the various bus mappings on the
1070 * Note: We consider that crossing any level with #size-cells == 0 to mean
1071 * that translation is impossible (that is we are not dealing with a value
1072 * that can be mapped to a cpu physical address). This is not really specified
1073 * that way, but this is traditionally the way IBM at least do things
1075 u64 __of_translate_address(void *blob, int node_offset, const u32 *in_addr,
1079 struct of_bus *bus, *pbus;
1080 u32 addr[OF_MAX_ADDR_CELLS];
1081 int na, ns, pna, pns;
1082 u64 result = OF_BAD_ADDR;
1084 debug("OF: ** translation for device %s **\n",
1085 fdt_get_name(blob, node_offset, NULL));
1087 /* Get parent & match bus type */
1088 parent = fdt_parent_offset(blob, node_offset);
1091 bus = &of_busses[0];
1093 /* Cound address cells & copy address locally */
1094 bus->count_cells(blob, parent, &na, &ns);
1095 if (!OF_CHECK_COUNTS(na, ns)) {
1096 printf("%s: Bad cell count for %s\n", __FUNCTION__,
1097 fdt_get_name(blob, node_offset, NULL));
1100 memcpy(addr, in_addr, na * 4);
1102 debug("OF: bus is %s (na=%d, ns=%d) on %s\n",
1103 bus->name, na, ns, fdt_get_name(blob, parent, NULL));
1104 of_dump_addr("OF: translating address:", addr, na);
1108 /* Switch to parent bus */
1109 node_offset = parent;
1110 parent = fdt_parent_offset(blob, node_offset);
1112 /* If root, we have finished */
1114 debug("OF: reached root node\n");
1115 result = of_read_number(addr, na);
1119 /* Get new parent bus and counts */
1120 pbus = &of_busses[0];
1121 pbus->count_cells(blob, parent, &pna, &pns);
1122 if (!OF_CHECK_COUNTS(pna, pns)) {
1123 printf("%s: Bad cell count for %s\n", __FUNCTION__,
1124 fdt_get_name(blob, node_offset, NULL));
1128 debug("OF: parent bus is %s (na=%d, ns=%d) on %s\n",
1129 pbus->name, pna, pns, fdt_get_name(blob, parent, NULL));
1131 /* Apply bus translation */
1132 if (of_translate_one(blob, node_offset, bus, pbus,
1133 addr, na, ns, pna, rprop))
1136 /* Complete the move up one level */
1141 of_dump_addr("OF: one level translation:", addr, na);
1148 u64 fdt_translate_address(void *blob, int node_offset, const u32 *in_addr)
1150 return __of_translate_address(blob, node_offset, in_addr, "ranges");
1154 * fdt_node_offset_by_compat_reg: Find a node that matches compatiable and
1155 * who's reg property matches a physical cpu address
1157 * @blob: ptr to device tree
1158 * @compat: compatiable string to match
1159 * @compat_off: property name
1162 int fdt_node_offset_by_compat_reg(void *blob, const char *compat,
1163 phys_addr_t compat_off)
1165 int len, off = fdt_node_offset_by_compatible(blob, -1, compat);
1166 while (off != -FDT_ERR_NOTFOUND) {
1167 u32 *reg = (u32 *)fdt_getprop(blob, off, "reg", &len);
1169 if (compat_off == fdt_translate_address(blob, off, reg))
1172 off = fdt_node_offset_by_compatible(blob, off, compat);
1175 return -FDT_ERR_NOTFOUND;
1179 * fdt_alloc_phandle: Return next free phandle value
1181 * @blob: ptr to device tree
1183 int fdt_alloc_phandle(void *blob)
1185 int offset, len, phandle = 0;
1188 for (offset = fdt_next_node(blob, -1, NULL); offset >= 0;
1189 offset = fdt_next_node(blob, offset, NULL)) {
1190 val = fdt_getprop(blob, offset, "linux,phandle", &len);
1192 phandle = max(*val, phandle);
1199 * fdt_create_phandle: Create a phandle property for the given node
1201 * @fdt: ptr to device tree
1202 * @nodeoffset: node to update
1203 * @phandle: phandle value to set (must be unique)
1205 int fdt_create_phandle(void *fdt, int nodeoffset, uint32_t phandle)
1210 int off = fdt_node_offset_by_phandle(fdt, phandle);
1212 if ((off >= 0) && (off != nodeoffset)) {
1215 fdt_get_path(fdt, nodeoffset, buf, sizeof(buf));
1216 printf("Trying to update node %s with phandle %u ",
1219 fdt_get_path(fdt, off, buf, sizeof(buf));
1220 printf("that already exists in node %s.\n", buf);
1221 return -FDT_ERR_BADPHANDLE;
1225 ret = fdt_setprop_cell(fdt, nodeoffset, "phandle", phandle);
1230 * For now, also set the deprecated "linux,phandle" property, so that we
1231 * don't break older kernels.
1233 ret = fdt_setprop_cell(fdt, nodeoffset, "linux,phandle", phandle);
1238 #if defined(CONFIG_VIDEO)
1239 int fdt_add_edid(void *blob, const char *compat, unsigned char *edid_buf)
1244 noff = fdt_node_offset_by_compatible(blob, -1, compat);
1245 if (noff != -FDT_ERR_NOTFOUND) {
1246 debug("%s: %s\n", fdt_get_name(blob, noff, 0), compat);
1248 ret = fdt_setprop(blob, noff, "edid", edid_buf, 128);
1249 if (ret == -FDT_ERR_NOSPACE) {
1250 ret = fdt_increase_size(blob, 512);
1255 } else if (ret < 0) {
1256 printf("Can't add property: %s\n", fdt_strerror(ret));
1262 printf("Can't increase blob size: %s\n", fdt_strerror(ret));
1268 * Verify the physical address of device tree node for a given alias
1270 * This function locates the device tree node of a given alias, and then
1271 * verifies that the physical address of that device matches the given
1272 * parameter. It displays a message if there is a mismatch.
1274 * Returns 1 on success, 0 on failure
1276 int fdt_verify_alias_address(void *fdt, int anode, const char *alias, u64 addr)
1283 path = fdt_getprop(fdt, anode, alias, NULL);
1285 /* If there's no such alias, then it's not a failure */
1289 node = fdt_path_offset(fdt, path);
1291 printf("Warning: device tree alias '%s' points to invalid "
1292 "node %s.\n", alias, path);
1296 reg = fdt_getprop(fdt, node, "reg", &len);
1298 printf("Warning: device tree node '%s' has no address.\n",
1303 dt_addr = fdt_translate_address(fdt, node, reg);
1304 if (addr != dt_addr) {
1305 printf("Warning: U-Boot configured device %s at address %llx,\n"
1306 " but the device tree has it address %llx.\n",
1307 alias, addr, dt_addr);
1315 * Returns the base address of an SOC or PCI node
1317 u64 fdt_get_base_address(void *fdt, int node)
1323 prop = fdt_getprop(fdt, node, "#address-cells", &size);
1324 if (prop && size == 4)
1329 prop = fdt_getprop(fdt, node, "ranges", &size);
1331 return prop ? fdt_translate_address(fdt, node, prop + naddr) : 0;