3 * Gerald Van Baren, Custom IDEAS, vanbaren@cideas.com
5 * Copyright 2010-2011 Freescale Semiconductor, Inc.
7 * SPDX-License-Identifier: GPL-2.0+
12 #include <stdio_dev.h>
13 #include <linux/ctype.h>
14 #include <linux/types.h>
15 #include <asm/global_data.h>
17 #include <fdt_support.h>
22 * fdt_getprop_u32_default_node - Return a node's property or a default
24 * @fdt: ptr to device tree
25 * @off: offset of node
26 * @cell: cell offset in property
27 * @prop: property name
28 * @dflt: default value if the property isn't found
30 * Convenience function to return a node's property or a default value if
31 * the property doesn't exist.
33 u32 fdt_getprop_u32_default_node(const void *fdt, int off, int cell,
34 const char *prop, const u32 dflt)
39 val = fdt_getprop(fdt, off, prop, &len);
41 /* Check if property exists */
45 /* Check if property is long enough */
46 if (len < ((cell + 1) * sizeof(uint32_t)))
49 return fdt32_to_cpu(*val);
53 * fdt_getprop_u32_default - Find a node and return it's property or a default
55 * @fdt: ptr to device tree
57 * @prop: property name
58 * @dflt: default value if the property isn't found
60 * Convenience function to find a node and return it's property or a
61 * default value if it doesn't exist.
63 u32 fdt_getprop_u32_default(const void *fdt, const char *path,
64 const char *prop, const u32 dflt)
68 off = fdt_path_offset(fdt, path);
72 return fdt_getprop_u32_default_node(fdt, off, 0, prop, dflt);
76 * fdt_find_and_setprop: Find a node and set it's property
78 * @fdt: ptr to device tree
80 * @prop: property name
81 * @val: ptr to new value
82 * @len: length of new property value
83 * @create: flag to create the property if it doesn't exist
85 * Convenience function to directly set a property given the path to the node.
87 int fdt_find_and_setprop(void *fdt, const char *node, const char *prop,
88 const void *val, int len, int create)
90 int nodeoff = fdt_path_offset(fdt, node);
95 if ((!create) && (fdt_get_property(fdt, nodeoff, prop, NULL) == NULL))
96 return 0; /* create flag not set; so exit quietly */
98 return fdt_setprop(fdt, nodeoff, prop, val, len);
102 * fdt_find_or_add_subnode() - find or possibly add a subnode of a given node
104 * @fdt: pointer to the device tree blob
105 * @parentoffset: structure block offset of a node
106 * @name: name of the subnode to locate
108 * fdt_subnode_offset() finds a subnode of the node with a given name.
109 * If the subnode does not exist, it will be created.
111 int fdt_find_or_add_subnode(void *fdt, int parentoffset, const char *name)
115 offset = fdt_subnode_offset(fdt, parentoffset, name);
117 if (offset == -FDT_ERR_NOTFOUND)
118 offset = fdt_add_subnode(fdt, parentoffset, name);
121 printf("%s: %s: %s\n", __func__, name, fdt_strerror(offset));
126 /* rename to CONFIG_OF_STDOUT_PATH ? */
127 #if defined(OF_STDOUT_PATH)
128 static int fdt_fixup_stdout(void *fdt, int chosenoff)
130 return fdt_setprop(fdt, chosenoff, "linux,stdout-path",
131 OF_STDOUT_PATH, strlen(OF_STDOUT_PATH) + 1);
133 #elif defined(CONFIG_OF_STDOUT_VIA_ALIAS) && defined(CONFIG_CONS_INDEX)
134 static void fdt_fill_multisername(char *sername, size_t maxlen)
136 const char *outname = stdio_devices[stdout]->name;
138 if (strcmp(outname, "serial") > 0)
139 strncpy(sername, outname, maxlen);
142 if (strcmp(outname + 1, "serial") > 0)
143 strncpy(sername, outname + 1, maxlen);
146 static int fdt_fixup_stdout(void *fdt, int chosenoff)
150 char sername[9] = { 0 };
153 char tmp[256]; /* long enough */
155 fdt_fill_multisername(sername, sizeof(sername) - 1);
157 sprintf(sername, "serial%d", CONFIG_CONS_INDEX - 1);
159 aliasoff = fdt_path_offset(fdt, "/aliases");
165 path = fdt_getprop(fdt, aliasoff, sername, &len);
171 /* fdt_setprop may break "path" so we copy it to tmp buffer */
172 memcpy(tmp, path, len);
174 err = fdt_setprop(fdt, chosenoff, "linux,stdout-path", tmp, len);
176 printf("WARNING: could not set linux,stdout-path %s.\n",
182 printf("WARNING: %s: could not read %s alias: %s\n",
183 __func__, sername, fdt_strerror(err));
188 static int fdt_fixup_stdout(void *fdt, int chosenoff)
194 static inline int fdt_setprop_uxx(void *fdt, int nodeoffset, const char *name,
195 uint64_t val, int is_u64)
198 return fdt_setprop_u64(fdt, nodeoffset, name, val);
200 return fdt_setprop_u32(fdt, nodeoffset, name, (uint32_t)val);
203 int fdt_root(void *fdt)
208 err = fdt_check_header(fdt);
210 printf("fdt_root: %s\n", fdt_strerror(err));
214 serial = getenv("serial#");
216 err = fdt_setprop(fdt, 0, "serial-number", serial,
220 printf("WARNING: could not set serial-number %s.\n",
229 int fdt_initrd(void *fdt, ulong initrd_start, ulong initrd_end)
236 /* just return if the size of initrd is zero */
237 if (initrd_start == initrd_end)
240 /* find or create "/chosen" node. */
241 nodeoffset = fdt_find_or_add_subnode(fdt, 0, "chosen");
245 total = fdt_num_mem_rsv(fdt);
248 * Look for an existing entry and update it. If we don't find
249 * the entry, we will j be the next available slot.
251 for (j = 0; j < total; j++) {
252 err = fdt_get_mem_rsv(fdt, j, &addr, &size);
253 if (addr == initrd_start) {
254 fdt_del_mem_rsv(fdt, j);
259 err = fdt_add_mem_rsv(fdt, initrd_start, initrd_end - initrd_start);
261 printf("fdt_initrd: %s\n", fdt_strerror(err));
265 is_u64 = (fdt_address_cells(fdt, 0) == 2);
267 err = fdt_setprop_uxx(fdt, nodeoffset, "linux,initrd-start",
268 (uint64_t)initrd_start, is_u64);
271 printf("WARNING: could not set linux,initrd-start %s.\n",
276 err = fdt_setprop_uxx(fdt, nodeoffset, "linux,initrd-end",
277 (uint64_t)initrd_end, is_u64);
280 printf("WARNING: could not set linux,initrd-end %s.\n",
289 int fdt_chosen(void *fdt)
293 char *str; /* used to set string properties */
295 err = fdt_check_header(fdt);
297 printf("fdt_chosen: %s\n", fdt_strerror(err));
301 /* find or create "/chosen" node. */
302 nodeoffset = fdt_find_or_add_subnode(fdt, 0, "chosen");
306 str = getenv("bootargs");
308 err = fdt_setprop(fdt, nodeoffset, "bootargs", str,
311 printf("WARNING: could not set bootargs %s.\n",
317 return fdt_fixup_stdout(fdt, nodeoffset);
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);
399 * fdt_pack_reg - pack address and size array into the "reg"-suitable stream
401 static int fdt_pack_reg(const void *fdt, void *buf, u64 *address, u64 *size,
405 int address_cells = fdt_address_cells(fdt, 0);
406 int size_cells = fdt_size_cells(fdt, 0);
409 for (i = 0; i < n; i++) {
410 if (address_cells == 2)
411 *(fdt64_t *)p = cpu_to_fdt64(address[i]);
413 *(fdt32_t *)p = cpu_to_fdt32(address[i]);
414 p += 4 * address_cells;
417 *(fdt64_t *)p = cpu_to_fdt64(size[i]);
419 *(fdt32_t *)p = cpu_to_fdt32(size[i]);
423 return p - (char *)buf;
426 #ifdef CONFIG_NR_DRAM_BANKS
427 #define MEMORY_BANKS_MAX CONFIG_NR_DRAM_BANKS
429 #define MEMORY_BANKS_MAX 4
431 int fdt_fixup_memory_banks(void *blob, u64 start[], u64 size[], int banks)
435 u8 tmp[MEMORY_BANKS_MAX * 16]; /* Up to 64-bit address + 64-bit size */
437 if (banks > MEMORY_BANKS_MAX) {
438 printf("%s: num banks %d exceeds hardcoded limit %d."
439 " Recompile with higher MEMORY_BANKS_MAX?\n",
440 __FUNCTION__, banks, MEMORY_BANKS_MAX);
444 err = fdt_check_header(blob);
446 printf("%s: %s\n", __FUNCTION__, fdt_strerror(err));
450 /* find or create "/memory" node. */
451 nodeoffset = fdt_find_or_add_subnode(blob, 0, "memory");
455 err = fdt_setprop(blob, nodeoffset, "device_type", "memory",
458 printf("WARNING: could not set %s %s.\n", "device_type",
466 len = fdt_pack_reg(blob, tmp, start, size, banks);
468 err = fdt_setprop(blob, nodeoffset, "reg", tmp, len);
470 printf("WARNING: could not set %s %s.\n",
471 "reg", fdt_strerror(err));
477 int fdt_fixup_memory(void *blob, u64 start, u64 size)
479 return fdt_fixup_memory_banks(blob, &start, &size, 1);
482 void fdt_fixup_ethernet(void *fdt)
485 char enet[16], *tmp, *end;
488 unsigned char mac_addr[6];
490 node = fdt_path_offset(fdt, "/aliases");
494 if (!getenv("ethaddr")) {
495 if (getenv("usbethaddr")) {
496 strcpy(mac, "usbethaddr");
498 debug("No ethernet MAC Address defined\n");
502 strcpy(mac, "ethaddr");
506 while ((tmp = getenv(mac)) != NULL) {
507 sprintf(enet, "ethernet%d", i);
508 path = fdt_getprop(fdt, node, enet, NULL);
510 debug("No alias for %s\n", enet);
511 sprintf(mac, "eth%daddr", ++i);
515 for (j = 0; j < 6; j++) {
516 mac_addr[j] = tmp ? simple_strtoul(tmp, &end, 16) : 0;
518 tmp = (*end) ? end+1 : end;
521 do_fixup_by_path(fdt, path, "mac-address", &mac_addr, 6, 0);
522 do_fixup_by_path(fdt, path, "local-mac-address",
525 sprintf(mac, "eth%daddr", ++i);
529 /* Resize the fdt to its actual size + a bit of padding */
530 int fdt_shrink_to_minimum(void *blob)
540 total = fdt_num_mem_rsv(blob);
541 for (i = 0; i < total; i++) {
542 fdt_get_mem_rsv(blob, i, &addr, &size);
543 if (addr == (uintptr_t)blob) {
544 fdt_del_mem_rsv(blob, i);
550 * Calculate the actual size of the fdt
551 * plus the size needed for 5 fdt_add_mem_rsv, one
552 * for the fdt itself and 4 for a possible initrd
553 * ((initrd-start + initrd-end) * 2 (name & value))
555 actualsize = fdt_off_dt_strings(blob) +
556 fdt_size_dt_strings(blob) + 5 * sizeof(struct fdt_reserve_entry);
558 /* Make it so the fdt ends on a page boundary */
559 actualsize = ALIGN(actualsize + ((uintptr_t)blob & 0xfff), 0x1000);
560 actualsize = actualsize - ((uintptr_t)blob & 0xfff);
562 /* Change the fdt header to reflect the correct size */
563 fdt_set_totalsize(blob, actualsize);
565 /* Add the new reservation */
566 ret = fdt_add_mem_rsv(blob, (uintptr_t)blob, actualsize);
574 #define CONFIG_SYS_PCI_NR_INBOUND_WIN 4
576 #define FDT_PCI_PREFETCH (0x40000000)
577 #define FDT_PCI_MEM32 (0x02000000)
578 #define FDT_PCI_IO (0x01000000)
579 #define FDT_PCI_MEM64 (0x03000000)
581 int fdt_pci_dma_ranges(void *blob, int phb_off, struct pci_controller *hose) {
583 int addrcell, sizecell, len, r;
585 /* sized based on pci addr cells, size-cells, & address-cells */
586 u32 dma_ranges[(3 + 2 + 2) * CONFIG_SYS_PCI_NR_INBOUND_WIN];
588 addrcell = fdt_getprop_u32_default(blob, "/", "#address-cells", 1);
589 sizecell = fdt_getprop_u32_default(blob, "/", "#size-cells", 1);
591 dma_range = &dma_ranges[0];
592 for (r = 0; r < hose->region_count; r++) {
593 u64 bus_start, phys_start, size;
595 /* skip if !PCI_REGION_SYS_MEMORY */
596 if (!(hose->regions[r].flags & PCI_REGION_SYS_MEMORY))
599 bus_start = (u64)hose->regions[r].bus_start;
600 phys_start = (u64)hose->regions[r].phys_start;
601 size = (u64)hose->regions[r].size;
604 if (size >= 0x100000000ull)
605 dma_range[0] |= FDT_PCI_MEM64;
607 dma_range[0] |= FDT_PCI_MEM32;
608 if (hose->regions[r].flags & PCI_REGION_PREFETCH)
609 dma_range[0] |= FDT_PCI_PREFETCH;
610 #ifdef CONFIG_SYS_PCI_64BIT
611 dma_range[1] = bus_start >> 32;
615 dma_range[2] = bus_start & 0xffffffff;
618 dma_range[3] = phys_start >> 32;
619 dma_range[4] = phys_start & 0xffffffff;
621 dma_range[3] = phys_start & 0xffffffff;
625 dma_range[3 + addrcell + 0] = size >> 32;
626 dma_range[3 + addrcell + 1] = size & 0xffffffff;
628 dma_range[3 + addrcell + 0] = size & 0xffffffff;
631 dma_range += (3 + addrcell + sizecell);
634 len = dma_range - &dma_ranges[0];
636 fdt_setprop(blob, phb_off, "dma-ranges", &dma_ranges[0], len*4);
642 #ifdef CONFIG_FDT_FIXUP_NOR_FLASH_SIZE
644 * Provide a weak default function to return the flash bank size.
645 * There might be multiple non-identical flash chips connected to one
646 * chip-select, so we need to pass an index as well.
648 u32 __flash_get_bank_size(int cs, int idx)
650 extern flash_info_t flash_info[];
653 * As default, a simple 1:1 mapping is provided. Boards with
654 * a different mapping need to supply a board specific mapping
657 return flash_info[cs].size;
659 u32 flash_get_bank_size(int cs, int idx)
660 __attribute__((weak, alias("__flash_get_bank_size")));
663 * This function can be used to update the size in the "reg" property
664 * of all NOR FLASH device nodes. This is necessary for boards with
665 * non-fixed NOR FLASH sizes.
667 int fdt_fixup_nor_flash_size(void *blob)
669 char compat[][16] = { "cfi-flash", "jedec-flash" };
672 struct fdt_property *prop;
676 for (i = 0; i < 2; i++) {
677 off = fdt_node_offset_by_compatible(blob, -1, compat[i]);
678 while (off != -FDT_ERR_NOTFOUND) {
682 * Found one compatible node, so fixup the size
683 * int its reg properties
685 prop = fdt_get_property_w(blob, off, "reg", &len);
687 int tuple_size = 3 * sizeof(reg);
690 * There might be multiple reg-tuples,
691 * so loop through them all
693 reg = reg2 = (u32 *)&prop->data[0];
694 for (idx = 0; idx < (len / tuple_size); idx++) {
696 * Update size in reg property
698 reg[2] = flash_get_bank_size(reg[0],
702 * Point to next reg tuple
707 fdt_setprop(blob, off, "reg", reg2, len);
710 /* Move to next compatible node */
711 off = fdt_node_offset_by_compatible(blob, off,
720 int fdt_increase_size(void *fdt, int add_len)
724 newlen = fdt_totalsize(fdt) + add_len;
726 /* Open in place with a new len */
727 return fdt_open_into(fdt, fdt, newlen);
730 #ifdef CONFIG_FDT_FIXUP_PARTITIONS
731 #include <jffs2/load_kernel.h>
732 #include <mtd_node.h>
739 int fdt_del_subnodes(const void *blob, int parent_offset)
744 for (ndepth = 0, off = fdt_next_node(blob, parent_offset, &ndepth);
745 (off >= 0) && (ndepth > 0);
746 off = fdt_next_node(blob, off, &ndepth)) {
748 debug("delete %s: offset: %x\n",
749 fdt_get_name(blob, off, 0), off);
750 ret = fdt_del_node((void *)blob, off);
752 printf("Can't delete node: %s\n",
764 int fdt_del_partitions(void *blob, int parent_offset)
771 off = fdt_next_node(blob, parent_offset, &ndepth);
772 if (off > 0 && ndepth == 1) {
773 prop = fdt_getprop(blob, off, "label", NULL);
776 * Could not find label property, nand {}; node?
777 * Check subnode, delete partitions there if any.
779 return fdt_del_partitions(blob, off);
781 ret = fdt_del_subnodes(blob, parent_offset);
783 printf("Can't remove subnodes: %s\n",
792 int fdt_node_set_part_info(void *blob, int parent_offset,
793 struct mtd_device *dev)
795 struct list_head *pentry;
796 struct part_info *part;
797 struct reg_cell cell;
802 ret = fdt_del_partitions(blob, parent_offset);
807 * Check if it is nand {}; subnode, adjust
808 * the offset in this case
810 off = fdt_next_node(blob, parent_offset, &ndepth);
811 if (off > 0 && ndepth == 1)
815 list_for_each_prev(pentry, &dev->parts) {
818 part = list_entry(pentry, struct part_info, link);
820 debug("%2d: %-20s0x%08llx\t0x%08llx\t%d\n",
821 part_num, part->name, part->size,
822 part->offset, part->mask_flags);
824 sprintf(buf, "partition@%llx", part->offset);
826 ret = fdt_add_subnode(blob, parent_offset, buf);
827 if (ret == -FDT_ERR_NOSPACE) {
828 ret = fdt_increase_size(blob, 512);
833 } else if (ret < 0) {
834 printf("Can't add partition node: %s\n",
840 /* Check MTD_WRITEABLE_CMD flag */
841 if (part->mask_flags & 1) {
843 ret = fdt_setprop(blob, newoff, "read_only", NULL, 0);
844 if (ret == -FDT_ERR_NOSPACE) {
845 ret = fdt_increase_size(blob, 512);
854 cell.r0 = cpu_to_fdt32(part->offset);
855 cell.r1 = cpu_to_fdt32(part->size);
857 ret = fdt_setprop(blob, newoff, "reg", &cell, sizeof(cell));
858 if (ret == -FDT_ERR_NOSPACE) {
859 ret = fdt_increase_size(blob, 512);
868 ret = fdt_setprop_string(blob, newoff, "label", part->name);
869 if (ret == -FDT_ERR_NOSPACE) {
870 ret = fdt_increase_size(blob, 512);
882 printf("Can't increase blob size: %s\n", fdt_strerror(ret));
885 printf("Can't add property: %s\n", fdt_strerror(ret));
890 * Update partitions in nor/nand nodes using info from
891 * mtdparts environment variable. The nodes to update are
892 * specified by node_info structure which contains mtd device
893 * type and compatible string: E. g. the board code in
894 * ft_board_setup() could use:
896 * struct node_info nodes[] = {
897 * { "fsl,mpc5121-nfc", MTD_DEV_TYPE_NAND, },
898 * { "cfi-flash", MTD_DEV_TYPE_NOR, },
901 * fdt_fixup_mtdparts(blob, nodes, ARRAY_SIZE(nodes));
903 void fdt_fixup_mtdparts(void *blob, void *node_info, int node_info_size)
905 struct node_info *ni = node_info;
906 struct mtd_device *dev;
911 parts = getenv("mtdparts");
915 if (mtdparts_init() != 0)
918 for (i = 0; i < node_info_size; i++) {
920 noff = fdt_node_offset_by_compatible(blob, -1, ni[i].compat);
921 while (noff != -FDT_ERR_NOTFOUND) {
922 debug("%s: %s, mtd dev type %d\n",
923 fdt_get_name(blob, noff, 0),
924 ni[i].compat, ni[i].type);
925 dev = device_find(ni[i].type, idx++);
927 if (fdt_node_set_part_info(blob, noff, dev))
928 return; /* return on error */
931 /* Jump to next flash node */
932 noff = fdt_node_offset_by_compatible(blob, noff,
939 void fdt_del_node_and_alias(void *blob, const char *alias)
941 int off = fdt_path_offset(blob, alias);
946 fdt_del_node(blob, off);
948 off = fdt_path_offset(blob, "/aliases");
949 fdt_delprop(blob, off, alias);
952 /* Max address size we deal with */
953 #define OF_MAX_ADDR_CELLS 4
954 #define OF_BAD_ADDR FDT_ADDR_T_NONE
955 #define OF_CHECK_COUNTS(na) ((na) > 0 && (na) <= OF_MAX_ADDR_CELLS)
959 static void of_dump_addr(const char *s, const fdt32_t *addr, int na)
963 printf(" %08x", *(addr++));
967 static void of_dump_addr(const char *s, const fdt32_t *addr, int na) { }
970 /* Callbacks for bus specific translators */
973 const char *addresses;
974 void (*count_cells)(void *blob, int parentoffset,
975 int *addrc, int *sizec);
976 u64 (*map)(fdt32_t *addr, const fdt32_t *range,
977 int na, int ns, int pna);
978 int (*translate)(fdt32_t *addr, u64 offset, int na);
981 /* Default translator (generic bus) */
982 void of_bus_default_count_cells(void *blob, int parentoffset,
983 int *addrc, int *sizec)
988 *addrc = fdt_address_cells(blob, parentoffset);
991 prop = fdt_getprop(blob, parentoffset, "#size-cells", NULL);
993 *sizec = be32_to_cpup(prop);
999 static u64 of_bus_default_map(fdt32_t *addr, const fdt32_t *range,
1000 int na, int ns, int pna)
1004 cp = of_read_number(range, na);
1005 s = of_read_number(range + na + pna, ns);
1006 da = of_read_number(addr, na);
1008 debug("OF: default map, cp=%" PRIu64 ", s=%" PRIu64
1009 ", da=%" PRIu64 "\n", cp, s, da);
1011 if (da < cp || da >= (cp + s))
1016 static int of_bus_default_translate(fdt32_t *addr, u64 offset, int na)
1018 u64 a = of_read_number(addr, na);
1019 memset(addr, 0, na * 4);
1022 addr[na - 2] = cpu_to_fdt32(a >> 32);
1023 addr[na - 1] = cpu_to_fdt32(a & 0xffffffffu);
1028 /* Array of bus specific translators */
1029 static struct of_bus of_busses[] = {
1034 .count_cells = of_bus_default_count_cells,
1035 .map = of_bus_default_map,
1036 .translate = of_bus_default_translate,
1040 static int of_translate_one(void * blob, int parent, struct of_bus *bus,
1041 struct of_bus *pbus, fdt32_t *addr,
1042 int na, int ns, int pna, const char *rprop)
1044 const fdt32_t *ranges;
1047 u64 offset = OF_BAD_ADDR;
1049 /* Normally, an absence of a "ranges" property means we are
1050 * crossing a non-translatable boundary, and thus the addresses
1051 * below the current not cannot be converted to CPU physical ones.
1052 * Unfortunately, while this is very clear in the spec, it's not
1053 * what Apple understood, and they do have things like /uni-n or
1054 * /ht nodes with no "ranges" property and a lot of perfectly
1055 * useable mapped devices below them. Thus we treat the absence of
1056 * "ranges" as equivalent to an empty "ranges" property which means
1057 * a 1:1 translation at that level. It's up to the caller not to try
1058 * to translate addresses that aren't supposed to be translated in
1059 * the first place. --BenH.
1061 ranges = fdt_getprop(blob, parent, rprop, &rlen);
1062 if (ranges == NULL || rlen == 0) {
1063 offset = of_read_number(addr, na);
1064 memset(addr, 0, pna * 4);
1065 debug("OF: no ranges, 1:1 translation\n");
1069 debug("OF: walking ranges...\n");
1071 /* Now walk through the ranges */
1073 rone = na + pna + ns;
1074 for (; rlen >= rone; rlen -= rone, ranges += rone) {
1075 offset = bus->map(addr, ranges, na, ns, pna);
1076 if (offset != OF_BAD_ADDR)
1079 if (offset == OF_BAD_ADDR) {
1080 debug("OF: not found !\n");
1083 memcpy(addr, ranges + na, 4 * pna);
1086 of_dump_addr("OF: parent translation for:", addr, pna);
1087 debug("OF: with offset: %" PRIu64 "\n", offset);
1089 /* Translate it into parent bus space */
1090 return pbus->translate(addr, offset, pna);
1094 * Translate an address from the device-tree into a CPU physical address,
1095 * this walks up the tree and applies the various bus mappings on the
1098 * Note: We consider that crossing any level with #size-cells == 0 to mean
1099 * that translation is impossible (that is we are not dealing with a value
1100 * that can be mapped to a cpu physical address). This is not really specified
1101 * that way, but this is traditionally the way IBM at least do things
1103 static u64 __of_translate_address(void *blob, int node_offset, const fdt32_t *in_addr,
1107 struct of_bus *bus, *pbus;
1108 fdt32_t addr[OF_MAX_ADDR_CELLS];
1109 int na, ns, pna, pns;
1110 u64 result = OF_BAD_ADDR;
1112 debug("OF: ** translation for device %s **\n",
1113 fdt_get_name(blob, node_offset, NULL));
1115 /* Get parent & match bus type */
1116 parent = fdt_parent_offset(blob, node_offset);
1119 bus = &of_busses[0];
1121 /* Cound address cells & copy address locally */
1122 bus->count_cells(blob, parent, &na, &ns);
1123 if (!OF_CHECK_COUNTS(na)) {
1124 printf("%s: Bad cell count for %s\n", __FUNCTION__,
1125 fdt_get_name(blob, node_offset, NULL));
1128 memcpy(addr, in_addr, na * 4);
1130 debug("OF: bus is %s (na=%d, ns=%d) on %s\n",
1131 bus->name, na, ns, fdt_get_name(blob, parent, NULL));
1132 of_dump_addr("OF: translating address:", addr, na);
1136 /* Switch to parent bus */
1137 node_offset = parent;
1138 parent = fdt_parent_offset(blob, node_offset);
1140 /* If root, we have finished */
1142 debug("OF: reached root node\n");
1143 result = of_read_number(addr, na);
1147 /* Get new parent bus and counts */
1148 pbus = &of_busses[0];
1149 pbus->count_cells(blob, parent, &pna, &pns);
1150 if (!OF_CHECK_COUNTS(pna)) {
1151 printf("%s: Bad cell count for %s\n", __FUNCTION__,
1152 fdt_get_name(blob, node_offset, NULL));
1156 debug("OF: parent bus is %s (na=%d, ns=%d) on %s\n",
1157 pbus->name, pna, pns, fdt_get_name(blob, parent, NULL));
1159 /* Apply bus translation */
1160 if (of_translate_one(blob, node_offset, bus, pbus,
1161 addr, na, ns, pna, rprop))
1164 /* Complete the move up one level */
1169 of_dump_addr("OF: one level translation:", addr, na);
1176 u64 fdt_translate_address(void *blob, int node_offset, const fdt32_t *in_addr)
1178 return __of_translate_address(blob, node_offset, in_addr, "ranges");
1182 * fdt_node_offset_by_compat_reg: Find a node that matches compatiable and
1183 * who's reg property matches a physical cpu address
1185 * @blob: ptr to device tree
1186 * @compat: compatiable string to match
1187 * @compat_off: property name
1190 int fdt_node_offset_by_compat_reg(void *blob, const char *compat,
1191 phys_addr_t compat_off)
1193 int len, off = fdt_node_offset_by_compatible(blob, -1, compat);
1194 while (off != -FDT_ERR_NOTFOUND) {
1195 const fdt32_t *reg = fdt_getprop(blob, off, "reg", &len);
1197 if (compat_off == fdt_translate_address(blob, off, reg))
1200 off = fdt_node_offset_by_compatible(blob, off, compat);
1203 return -FDT_ERR_NOTFOUND;
1207 * fdt_alloc_phandle: Return next free phandle value
1209 * @blob: ptr to device tree
1211 int fdt_alloc_phandle(void *blob)
1214 uint32_t 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 %"
1417 PRIx64 ",\n but the device tree has it address %"
1418 PRIx64 ".\n", 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 naddr = fdt_address_cells(fdt, node);
1436 prop = fdt_getprop(fdt, node, "ranges", &size);
1438 return prop ? fdt_translate_address(fdt, node, prop + naddr) : 0;
1442 * Read a property of size <prop_len>. Currently only supports 1 or 2 cells.
1444 static int fdt_read_prop(const fdt32_t *prop, int prop_len, int cell_off,
1445 uint64_t *val, int cells)
1447 const fdt32_t *prop32 = &prop[cell_off];
1448 const fdt64_t *prop64 = (const fdt64_t *)&prop[cell_off];
1450 if ((cell_off + cells) > prop_len)
1451 return -FDT_ERR_NOSPACE;
1455 *val = fdt32_to_cpu(*prop32);
1458 *val = fdt64_to_cpu(*prop64);
1461 return -FDT_ERR_NOSPACE;
1468 * fdt_read_range - Read a node's n'th range property
1470 * @fdt: ptr to device tree
1471 * @node: offset of node
1473 * @child_addr: pointer to storage for the "child address" field
1474 * @addr: pointer to storage for the CPU view translated physical start
1475 * @len: pointer to storage for the range length
1477 * Convenience function that reads and interprets a specific range out of
1478 * a number of the "ranges" property array.
1480 int fdt_read_range(void *fdt, int node, int n, uint64_t *child_addr,
1481 uint64_t *addr, uint64_t *len)
1483 int pnode = fdt_parent_offset(fdt, node);
1484 const fdt32_t *ranges;
1493 * The "ranges" property is an array of
1494 * { <child address> <parent address> <size in child address space> }
1496 * All 3 elements can span a diffent number of cells. Fetch their size.
1498 pacells = fdt_getprop_u32_default_node(fdt, pnode, 0, "#address-cells", 1);
1499 acells = fdt_getprop_u32_default_node(fdt, node, 0, "#address-cells", 1);
1500 scells = fdt_getprop_u32_default_node(fdt, node, 0, "#size-cells", 1);
1502 /* Now try to get the ranges property */
1503 ranges = fdt_getprop(fdt, node, "ranges", &ranges_len);
1505 return -FDT_ERR_NOTFOUND;
1506 ranges_len /= sizeof(uint32_t);
1508 /* Jump to the n'th entry */
1509 cell = n * (pacells + acells + scells);
1511 /* Read <child address> */
1513 r = fdt_read_prop(ranges, ranges_len, cell, child_addr,
1520 /* Read <parent address> */
1522 *addr = fdt_translate_address(fdt, node, ranges + cell);
1525 /* Read <size in child address space> */
1527 r = fdt_read_prop(ranges, ranges_len, cell, len, scells);
1536 * fdt_setup_simplefb_node - Fill and enable a simplefb node
1538 * @fdt: ptr to device tree
1539 * @node: offset of the simplefb node
1540 * @base_address: framebuffer base address
1541 * @width: width in pixels
1542 * @height: height in pixels
1543 * @stride: bytes per line
1544 * @format: pixel format string
1546 * Convenience function to fill and enable a simplefb node.
1548 int fdt_setup_simplefb_node(void *fdt, int node, u64 base_address, u32 width,
1549 u32 height, u32 stride, const char *format)
1553 int i, addrc, sizec, ret;
1555 of_bus_default_count_cells(fdt, fdt_parent_offset(fdt, node),
1559 cells[i++] = cpu_to_fdt32(base_address >> 32);
1560 cells[i++] = cpu_to_fdt32(base_address);
1563 cells[i++] = cpu_to_fdt32(height * stride);
1565 ret = fdt_setprop(fdt, node, "reg", cells, sizeof(cells[0]) * i);
1569 snprintf(name, sizeof(name), "framebuffer@%" PRIx64, base_address);
1570 ret = fdt_set_name(fdt, node, name);
1574 ret = fdt_setprop_u32(fdt, node, "width", width);
1578 ret = fdt_setprop_u32(fdt, node, "height", height);
1582 ret = fdt_setprop_u32(fdt, node, "stride", stride);
1586 ret = fdt_setprop_string(fdt, node, "format", format);
1590 ret = fdt_setprop_string(fdt, node, "status", "okay");
1598 * Update native-mode in display-timings from display environment variable.
1599 * The node to update are specified by path.
1601 int fdt_fixup_display(void *blob, const char *path, const char *display)
1605 if (!display || !path)
1606 return -FDT_ERR_NOTFOUND;
1608 toff = fdt_path_offset(blob, path);
1610 toff = fdt_subnode_offset(blob, toff, "display-timings");
1614 for (off = fdt_first_subnode(blob, toff);
1616 off = fdt_next_subnode(blob, off)) {
1617 uint32_t h = fdt_get_phandle(blob, off);
1618 debug("%s:0x%x\n", fdt_get_name(blob, off, NULL),
1620 if (strcasecmp(fdt_get_name(blob, off, NULL), display) == 0)
1621 return fdt_setprop_u32(blob, toff, "native-mode", h);