1 // SPDX-License-Identifier: GPL-2.0+
4 * Gerald Van Baren, Custom IDEAS, vanbaren@cideas.com
6 * Copyright 2010-2011 Freescale Semiconductor, Inc.
10 #include <stdio_dev.h>
11 #include <linux/ctype.h>
12 #include <linux/types.h>
13 #include <asm/global_data.h>
14 #include <linux/libfdt.h>
15 #include <fdt_support.h>
20 * fdt_getprop_u32_default_node - Return a node's property or a default
22 * @fdt: ptr to device tree
23 * @off: offset of node
24 * @cell: cell offset in property
25 * @prop: property name
26 * @dflt: default value if the property isn't found
28 * Convenience function to return a node's property or a default value if
29 * the property doesn't exist.
31 u32
fdt_getprop_u32_default_node(const void *fdt
, int off
, int cell
,
32 const char *prop
, const u32 dflt
)
37 val
= fdt_getprop(fdt
, off
, prop
, &len
);
39 /* Check if property exists */
43 /* Check if property is long enough */
44 if (len
< ((cell
+ 1) * sizeof(uint32_t)))
47 return fdt32_to_cpu(*val
);
51 * fdt_getprop_u32_default - Find a node and return it's property or a default
53 * @fdt: ptr to device tree
55 * @prop: property name
56 * @dflt: default value if the property isn't found
58 * Convenience function to find a node and return it's property or a
59 * default value if it doesn't exist.
61 u32
fdt_getprop_u32_default(const void *fdt
, const char *path
,
62 const char *prop
, const u32 dflt
)
66 off
= fdt_path_offset(fdt
, path
);
70 return fdt_getprop_u32_default_node(fdt
, off
, 0, prop
, dflt
);
74 * fdt_find_and_setprop: Find a node and set it's property
76 * @fdt: ptr to device tree
78 * @prop: property name
79 * @val: ptr to new value
80 * @len: length of new property value
81 * @create: flag to create the property if it doesn't exist
83 * Convenience function to directly set a property given the path to the node.
85 int fdt_find_and_setprop(void *fdt
, const char *node
, const char *prop
,
86 const void *val
, int len
, int create
)
88 int nodeoff
= fdt_path_offset(fdt
, node
);
93 if ((!create
) && (fdt_get_property(fdt
, nodeoff
, prop
, NULL
) == NULL
))
94 return 0; /* create flag not set; so exit quietly */
96 return fdt_setprop(fdt
, nodeoff
, prop
, val
, len
);
100 * fdt_find_or_add_subnode() - find or possibly add a subnode of a given node
102 * @fdt: pointer to the device tree blob
103 * @parentoffset: structure block offset of a node
104 * @name: name of the subnode to locate
106 * fdt_subnode_offset() finds a subnode of the node with a given name.
107 * If the subnode does not exist, it will be created.
109 int fdt_find_or_add_subnode(void *fdt
, int parentoffset
, const char *name
)
113 offset
= fdt_subnode_offset(fdt
, parentoffset
, name
);
115 if (offset
== -FDT_ERR_NOTFOUND
)
116 offset
= fdt_add_subnode(fdt
, parentoffset
, name
);
119 printf("%s: %s: %s\n", __func__
, name
, fdt_strerror(offset
));
124 /* rename to CONFIG_OF_STDOUT_PATH ? */
125 #if defined(OF_STDOUT_PATH)
126 static int fdt_fixup_stdout(void *fdt
, int chosenoff
)
128 return fdt_setprop(fdt
, chosenoff
, "linux,stdout-path",
129 OF_STDOUT_PATH
, strlen(OF_STDOUT_PATH
) + 1);
131 #elif defined(CONFIG_OF_STDOUT_VIA_ALIAS) && defined(CONFIG_CONS_INDEX)
132 static int fdt_fixup_stdout(void *fdt
, int chosenoff
)
136 char sername
[9] = { 0 };
139 char tmp
[256]; /* long enough */
141 sprintf(sername
, "serial%d", CONFIG_CONS_INDEX
- 1);
143 aliasoff
= fdt_path_offset(fdt
, "/aliases");
149 path
= fdt_getprop(fdt
, aliasoff
, sername
, &len
);
155 /* fdt_setprop may break "path" so we copy it to tmp buffer */
156 memcpy(tmp
, path
, len
);
158 err
= fdt_setprop(fdt
, chosenoff
, "linux,stdout-path", tmp
, len
);
160 printf("WARNING: could not set linux,stdout-path %s.\n",
166 printf("WARNING: %s: could not read %s alias: %s\n",
167 __func__
, sername
, fdt_strerror(err
));
172 static int fdt_fixup_stdout(void *fdt
, int chosenoff
)
178 static inline int fdt_setprop_uxx(void *fdt
, int nodeoffset
, const char *name
,
179 uint64_t val
, int is_u64
)
182 return fdt_setprop_u64(fdt
, nodeoffset
, name
, val
);
184 return fdt_setprop_u32(fdt
, nodeoffset
, name
, (uint32_t)val
);
187 int fdt_root(void *fdt
)
192 err
= fdt_check_header(fdt
);
194 printf("fdt_root: %s\n", fdt_strerror(err
));
198 serial
= env_get("serial#");
200 err
= fdt_setprop(fdt
, 0, "serial-number", serial
,
204 printf("WARNING: could not set serial-number %s.\n",
213 int fdt_initrd(void *fdt
, ulong initrd_start
, ulong initrd_end
)
220 /* just return if the size of initrd is zero */
221 if (initrd_start
== initrd_end
)
224 /* find or create "/chosen" node. */
225 nodeoffset
= fdt_find_or_add_subnode(fdt
, 0, "chosen");
229 total
= fdt_num_mem_rsv(fdt
);
232 * Look for an existing entry and update it. If we don't find
233 * the entry, we will j be the next available slot.
235 for (j
= 0; j
< total
; j
++) {
236 err
= fdt_get_mem_rsv(fdt
, j
, &addr
, &size
);
237 if (addr
== initrd_start
) {
238 fdt_del_mem_rsv(fdt
, j
);
243 err
= fdt_add_mem_rsv(fdt
, initrd_start
, initrd_end
- initrd_start
);
245 printf("fdt_initrd: %s\n", fdt_strerror(err
));
249 is_u64
= (fdt_address_cells(fdt
, 0) == 2);
251 err
= fdt_setprop_uxx(fdt
, nodeoffset
, "linux,initrd-start",
252 (uint64_t)initrd_start
, is_u64
);
255 printf("WARNING: could not set linux,initrd-start %s.\n",
260 err
= fdt_setprop_uxx(fdt
, nodeoffset
, "linux,initrd-end",
261 (uint64_t)initrd_end
, is_u64
);
264 printf("WARNING: could not set linux,initrd-end %s.\n",
273 int fdt_chosen(void *fdt
)
277 char *str
; /* used to set string properties */
279 err
= fdt_check_header(fdt
);
281 printf("fdt_chosen: %s\n", fdt_strerror(err
));
285 /* find or create "/chosen" node. */
286 nodeoffset
= fdt_find_or_add_subnode(fdt
, 0, "chosen");
290 str
= env_get("bootargs");
292 err
= fdt_setprop(fdt
, nodeoffset
, "bootargs", str
,
295 printf("WARNING: could not set bootargs %s.\n",
301 return fdt_fixup_stdout(fdt
, nodeoffset
);
304 void do_fixup_by_path(void *fdt
, const char *path
, const char *prop
,
305 const void *val
, int len
, int create
)
309 debug("Updating property '%s/%s' = ", path
, prop
);
310 for (i
= 0; i
< len
; i
++)
311 debug(" %.2x", *(u8
*)(val
+i
));
314 int rc
= fdt_find_and_setprop(fdt
, path
, prop
, val
, len
, create
);
316 printf("Unable to update property %s:%s, err=%s\n",
317 path
, prop
, fdt_strerror(rc
));
320 void do_fixup_by_path_u32(void *fdt
, const char *path
, const char *prop
,
323 fdt32_t tmp
= cpu_to_fdt32(val
);
324 do_fixup_by_path(fdt
, path
, prop
, &tmp
, sizeof(tmp
), create
);
327 void do_fixup_by_prop(void *fdt
,
328 const char *pname
, const void *pval
, int plen
,
329 const char *prop
, const void *val
, int len
,
335 debug("Updating property '%s' = ", prop
);
336 for (i
= 0; i
< len
; i
++)
337 debug(" %.2x", *(u8
*)(val
+i
));
340 off
= fdt_node_offset_by_prop_value(fdt
, -1, pname
, pval
, plen
);
341 while (off
!= -FDT_ERR_NOTFOUND
) {
342 if (create
|| (fdt_get_property(fdt
, off
, prop
, NULL
) != NULL
))
343 fdt_setprop(fdt
, off
, prop
, val
, len
);
344 off
= fdt_node_offset_by_prop_value(fdt
, off
, pname
, pval
, plen
);
348 void do_fixup_by_prop_u32(void *fdt
,
349 const char *pname
, const void *pval
, int plen
,
350 const char *prop
, u32 val
, int create
)
352 fdt32_t tmp
= cpu_to_fdt32(val
);
353 do_fixup_by_prop(fdt
, pname
, pval
, plen
, prop
, &tmp
, 4, create
);
356 void do_fixup_by_compat(void *fdt
, const char *compat
,
357 const char *prop
, const void *val
, int len
, int create
)
362 debug("Updating property '%s' = ", prop
);
363 for (i
= 0; i
< len
; i
++)
364 debug(" %.2x", *(u8
*)(val
+i
));
367 off
= fdt_node_offset_by_compatible(fdt
, -1, compat
);
368 while (off
!= -FDT_ERR_NOTFOUND
) {
369 if (create
|| (fdt_get_property(fdt
, off
, prop
, NULL
) != NULL
))
370 fdt_setprop(fdt
, off
, prop
, val
, len
);
371 off
= fdt_node_offset_by_compatible(fdt
, off
, compat
);
375 void do_fixup_by_compat_u32(void *fdt
, const char *compat
,
376 const char *prop
, u32 val
, int create
)
378 fdt32_t tmp
= cpu_to_fdt32(val
);
379 do_fixup_by_compat(fdt
, compat
, prop
, &tmp
, 4, create
);
382 #ifdef CONFIG_ARCH_FIXUP_FDT_MEMORY
384 * fdt_pack_reg - pack address and size array into the "reg"-suitable stream
386 static int fdt_pack_reg(const void *fdt
, void *buf
, u64
*address
, u64
*size
,
390 int address_cells
= fdt_address_cells(fdt
, 0);
391 int size_cells
= fdt_size_cells(fdt
, 0);
394 for (i
= 0; i
< n
; i
++) {
395 if (address_cells
== 2)
396 *(fdt64_t
*)p
= cpu_to_fdt64(address
[i
]);
398 *(fdt32_t
*)p
= cpu_to_fdt32(address
[i
]);
399 p
+= 4 * address_cells
;
402 *(fdt64_t
*)p
= cpu_to_fdt64(size
[i
]);
404 *(fdt32_t
*)p
= cpu_to_fdt32(size
[i
]);
408 return p
- (char *)buf
;
411 #if CONFIG_NR_DRAM_BANKS > 4
412 #define MEMORY_BANKS_MAX CONFIG_NR_DRAM_BANKS
414 #define MEMORY_BANKS_MAX 4
416 int fdt_fixup_memory_banks(void *blob
, u64 start
[], u64 size
[], int banks
)
420 u8 tmp
[MEMORY_BANKS_MAX
* 16]; /* Up to 64-bit address + 64-bit size */
422 if (banks
> MEMORY_BANKS_MAX
) {
423 printf("%s: num banks %d exceeds hardcoded limit %d."
424 " Recompile with higher MEMORY_BANKS_MAX?\n",
425 __FUNCTION__
, banks
, MEMORY_BANKS_MAX
);
429 err
= fdt_check_header(blob
);
431 printf("%s: %s\n", __FUNCTION__
, fdt_strerror(err
));
435 /* find or create "/memory" node. */
436 nodeoffset
= fdt_find_or_add_subnode(blob
, 0, "memory");
440 err
= fdt_setprop(blob
, nodeoffset
, "device_type", "memory",
443 printf("WARNING: could not set %s %s.\n", "device_type",
448 for (i
= 0; i
< banks
; i
++) {
449 if (start
[i
] == 0 && size
[i
] == 0)
458 for (i
= 0; i
< banks
; i
++)
459 if (start
[i
] == 0 && size
[i
] == 0)
464 len
= fdt_pack_reg(blob
, tmp
, start
, size
, banks
);
466 err
= fdt_setprop(blob
, nodeoffset
, "reg", tmp
, len
);
468 printf("WARNING: could not set %s %s.\n",
469 "reg", fdt_strerror(err
));
476 int fdt_fixup_memory(void *blob
, u64 start
, u64 size
)
478 return fdt_fixup_memory_banks(blob
, &start
, &size
, 1);
481 void fdt_fixup_ethernet(void *fdt
)
487 unsigned char mac_addr
[ARP_HLEN
];
489 #ifdef FDT_SEQ_MACADDR_FROM_ENV
491 const struct fdt_property
*fdt_prop
;
494 if (fdt_path_offset(fdt
, "/aliases") < 0)
497 /* Cycle through all aliases */
498 for (prop
= 0; ; prop
++) {
501 /* FDT might have been edited, recompute the offset */
502 offset
= fdt_first_property_offset(fdt
,
503 fdt_path_offset(fdt
, "/aliases"));
504 /* Select property number 'prop' */
505 for (j
= 0; j
< prop
; j
++)
506 offset
= fdt_next_property_offset(fdt
, offset
);
511 path
= fdt_getprop_by_offset(fdt
, offset
, &name
, NULL
);
512 if (!strncmp(name
, "ethernet", 8)) {
513 /* Treat plain "ethernet" same as "ethernet0". */
514 if (!strcmp(name
, "ethernet")
515 #ifdef FDT_SEQ_MACADDR_FROM_ENV
516 || !strcmp(name
, "ethernet0")
520 #ifndef FDT_SEQ_MACADDR_FROM_ENV
522 i
= trailing_strtol(name
);
526 strcpy(mac
, "ethaddr");
528 sprintf(mac
, "eth%daddr", i
);
532 #ifdef FDT_SEQ_MACADDR_FROM_ENV
533 nodeoff
= fdt_path_offset(fdt
, path
);
534 fdt_prop
= fdt_get_property(fdt
, nodeoff
, "status",
536 if (fdt_prop
&& !strcmp(fdt_prop
->data
, "disabled"))
544 for (j
= 0; j
< 6; j
++) {
546 simple_strtoul(tmp
, &end
, 16) : 0;
548 tmp
= (*end
) ? end
+ 1 : end
;
551 do_fixup_by_path(fdt
, path
, "mac-address",
553 do_fixup_by_path(fdt
, path
, "local-mac-address",
559 int fdt_record_loadable(void *blob
, u32 index
, const char *name
,
560 uintptr_t load_addr
, u32 size
, uintptr_t entry_point
,
561 const char *type
, const char *os
)
565 err
= fdt_check_header(blob
);
567 printf("%s: %s\n", __func__
, fdt_strerror(err
));
571 /* find or create "/fit-images" node */
572 node
= fdt_find_or_add_subnode(blob
, 0, "fit-images");
576 /* find or create "/fit-images/<name>" node */
577 node
= fdt_find_or_add_subnode(blob
, node
, name
);
582 * We record these as 32bit entities, possibly truncating addresses.
583 * However, spl_fit.c is not 64bit safe either: i.e. we should not
584 * have an issue here.
586 fdt_setprop_u32(blob
, node
, "load-addr", load_addr
);
587 if (entry_point
!= -1)
588 fdt_setprop_u32(blob
, node
, "entry-point", entry_point
);
589 fdt_setprop_u32(blob
, node
, "size", size
);
591 fdt_setprop_string(blob
, node
, "type", type
);
593 fdt_setprop_string(blob
, node
, "os", os
);
598 /* Resize the fdt to its actual size + a bit of padding */
599 int fdt_shrink_to_minimum(void *blob
, uint extrasize
)
609 total
= fdt_num_mem_rsv(blob
);
610 for (i
= 0; i
< total
; i
++) {
611 fdt_get_mem_rsv(blob
, i
, &addr
, &size
);
612 if (addr
== (uintptr_t)blob
) {
613 fdt_del_mem_rsv(blob
, i
);
619 * Calculate the actual size of the fdt
620 * plus the size needed for 5 fdt_add_mem_rsv, one
621 * for the fdt itself and 4 for a possible initrd
622 * ((initrd-start + initrd-end) * 2 (name & value))
624 actualsize
= fdt_off_dt_strings(blob
) +
625 fdt_size_dt_strings(blob
) + 5 * sizeof(struct fdt_reserve_entry
);
627 actualsize
+= extrasize
;
628 /* Make it so the fdt ends on a page boundary */
629 actualsize
= ALIGN(actualsize
+ ((uintptr_t)blob
& 0xfff), 0x1000);
630 actualsize
= actualsize
- ((uintptr_t)blob
& 0xfff);
632 /* Change the fdt header to reflect the correct size */
633 fdt_set_totalsize(blob
, actualsize
);
635 /* Add the new reservation */
636 ret
= fdt_add_mem_rsv(blob
, (uintptr_t)blob
, actualsize
);
644 #define CONFIG_SYS_PCI_NR_INBOUND_WIN 4
646 #define FDT_PCI_PREFETCH (0x40000000)
647 #define FDT_PCI_MEM32 (0x02000000)
648 #define FDT_PCI_IO (0x01000000)
649 #define FDT_PCI_MEM64 (0x03000000)
651 int fdt_pci_dma_ranges(void *blob
, int phb_off
, struct pci_controller
*hose
) {
653 int addrcell
, sizecell
, len
, r
;
655 /* sized based on pci addr cells, size-cells, & address-cells */
656 u32 dma_ranges
[(3 + 2 + 2) * CONFIG_SYS_PCI_NR_INBOUND_WIN
];
658 addrcell
= fdt_getprop_u32_default(blob
, "/", "#address-cells", 1);
659 sizecell
= fdt_getprop_u32_default(blob
, "/", "#size-cells", 1);
661 dma_range
= &dma_ranges
[0];
662 for (r
= 0; r
< hose
->region_count
; r
++) {
663 u64 bus_start
, phys_start
, size
;
665 /* skip if !PCI_REGION_SYS_MEMORY */
666 if (!(hose
->regions
[r
].flags
& PCI_REGION_SYS_MEMORY
))
669 bus_start
= (u64
)hose
->regions
[r
].bus_start
;
670 phys_start
= (u64
)hose
->regions
[r
].phys_start
;
671 size
= (u64
)hose
->regions
[r
].size
;
674 if (size
>= 0x100000000ull
)
675 dma_range
[0] |= FDT_PCI_MEM64
;
677 dma_range
[0] |= FDT_PCI_MEM32
;
678 if (hose
->regions
[r
].flags
& PCI_REGION_PREFETCH
)
679 dma_range
[0] |= FDT_PCI_PREFETCH
;
680 #ifdef CONFIG_SYS_PCI_64BIT
681 dma_range
[1] = bus_start
>> 32;
685 dma_range
[2] = bus_start
& 0xffffffff;
688 dma_range
[3] = phys_start
>> 32;
689 dma_range
[4] = phys_start
& 0xffffffff;
691 dma_range
[3] = phys_start
& 0xffffffff;
695 dma_range
[3 + addrcell
+ 0] = size
>> 32;
696 dma_range
[3 + addrcell
+ 1] = size
& 0xffffffff;
698 dma_range
[3 + addrcell
+ 0] = size
& 0xffffffff;
701 dma_range
+= (3 + addrcell
+ sizecell
);
704 len
= dma_range
- &dma_ranges
[0];
706 fdt_setprop(blob
, phb_off
, "dma-ranges", &dma_ranges
[0], len
*4);
712 int fdt_increase_size(void *fdt
, int add_len
)
716 newlen
= fdt_totalsize(fdt
) + add_len
;
718 /* Open in place with a new len */
719 return fdt_open_into(fdt
, fdt
, newlen
);
722 #ifdef CONFIG_FDT_FIXUP_PARTITIONS
723 #include <jffs2/load_kernel.h>
724 #include <mtd_node.h>
731 static int fdt_del_subnodes(const void *blob
, int parent_offset
)
736 for (ndepth
= 0, off
= fdt_next_node(blob
, parent_offset
, &ndepth
);
737 (off
>= 0) && (ndepth
> 0);
738 off
= fdt_next_node(blob
, off
, &ndepth
)) {
740 debug("delete %s: offset: %x\n",
741 fdt_get_name(blob
, off
, 0), off
);
742 ret
= fdt_del_node((void *)blob
, off
);
744 printf("Can't delete node: %s\n",
756 static int fdt_del_partitions(void *blob
, int parent_offset
)
763 off
= fdt_next_node(blob
, parent_offset
, &ndepth
);
764 if (off
> 0 && ndepth
== 1) {
765 prop
= fdt_getprop(blob
, off
, "label", NULL
);
768 * Could not find label property, nand {}; node?
769 * Check subnode, delete partitions there if any.
771 return fdt_del_partitions(blob
, off
);
773 ret
= fdt_del_subnodes(blob
, parent_offset
);
775 printf("Can't remove subnodes: %s\n",
784 int fdt_node_set_part_info(void *blob
, int parent_offset
,
785 struct mtd_device
*dev
)
787 struct list_head
*pentry
;
788 struct part_info
*part
;
789 struct reg_cell cell
;
794 ret
= fdt_del_partitions(blob
, parent_offset
);
799 * Check if it is nand {}; subnode, adjust
800 * the offset in this case
802 off
= fdt_next_node(blob
, parent_offset
, &ndepth
);
803 if (off
> 0 && ndepth
== 1)
807 list_for_each_prev(pentry
, &dev
->parts
) {
810 part
= list_entry(pentry
, struct part_info
, link
);
812 debug("%2d: %-20s0x%08llx\t0x%08llx\t%d\n",
813 part_num
, part
->name
, part
->size
,
814 part
->offset
, part
->mask_flags
);
816 sprintf(buf
, "partition@%llx", part
->offset
);
818 ret
= fdt_add_subnode(blob
, parent_offset
, buf
);
819 if (ret
== -FDT_ERR_NOSPACE
) {
820 ret
= fdt_increase_size(blob
, 512);
825 } else if (ret
< 0) {
826 printf("Can't add partition node: %s\n",
832 /* Check MTD_WRITEABLE_CMD flag */
833 if (part
->mask_flags
& 1) {
835 ret
= fdt_setprop(blob
, newoff
, "read_only", NULL
, 0);
836 if (ret
== -FDT_ERR_NOSPACE
) {
837 ret
= fdt_increase_size(blob
, 512);
846 cell
.r0
= cpu_to_fdt32(part
->offset
);
847 cell
.r1
= cpu_to_fdt32(part
->size
);
849 ret
= fdt_setprop(blob
, newoff
, "reg", &cell
, sizeof(cell
));
850 if (ret
== -FDT_ERR_NOSPACE
) {
851 ret
= fdt_increase_size(blob
, 512);
860 ret
= fdt_setprop_string(blob
, newoff
, "label", part
->name
);
861 if (ret
== -FDT_ERR_NOSPACE
) {
862 ret
= fdt_increase_size(blob
, 512);
874 printf("Can't increase blob size: %s\n", fdt_strerror(ret
));
877 printf("Can't add property: %s\n", fdt_strerror(ret
));
882 * Update partitions in nor/nand nodes using info from
883 * mtdparts environment variable. The nodes to update are
884 * specified by node_info structure which contains mtd device
885 * type and compatible string: E. g. the board code in
886 * ft_board_setup() could use:
888 * struct node_info nodes[] = {
889 * { "fsl,mpc5121-nfc", MTD_DEV_TYPE_NAND, },
890 * { "cfi-flash", MTD_DEV_TYPE_NOR, },
893 * fdt_fixup_mtdparts(blob, nodes, ARRAY_SIZE(nodes));
895 void fdt_fixup_mtdparts(void *blob
, const struct node_info
*node_info
,
898 struct mtd_device
*dev
;
902 if (mtdparts_init() != 0)
905 for (i
= 0; i
< node_info_size
; i
++) {
907 noff
= fdt_node_offset_by_compatible(blob
, -1,
908 node_info
[i
].compat
);
909 while (noff
!= -FDT_ERR_NOTFOUND
) {
910 debug("%s: %s, mtd dev type %d\n",
911 fdt_get_name(blob
, noff
, 0),
912 node_info
[i
].compat
, node_info
[i
].type
);
913 dev
= device_find(node_info
[i
].type
, idx
++);
915 if (fdt_node_set_part_info(blob
, noff
, dev
))
916 return; /* return on error */
919 /* Jump to next flash node */
920 noff
= fdt_node_offset_by_compatible(blob
, noff
,
921 node_info
[i
].compat
);
927 void fdt_del_node_and_alias(void *blob
, const char *alias
)
929 int off
= fdt_path_offset(blob
, alias
);
934 fdt_del_node(blob
, off
);
936 off
= fdt_path_offset(blob
, "/aliases");
937 fdt_delprop(blob
, off
, alias
);
940 /* Max address size we deal with */
941 #define OF_MAX_ADDR_CELLS 4
942 #define OF_BAD_ADDR FDT_ADDR_T_NONE
943 #define OF_CHECK_COUNTS(na, ns) ((na) > 0 && (na) <= OF_MAX_ADDR_CELLS && \
948 static void of_dump_addr(const char *s
, const fdt32_t
*addr
, int na
)
952 printf(" %08x", *(addr
++));
956 static void of_dump_addr(const char *s
, const fdt32_t
*addr
, int na
) { }
960 * struct of_bus - Callbacks for bus specific translators
961 * @name: A string used to identify this bus in debug output.
962 * @addresses: The name of the DT property from which addresses are
963 * to be read, typically "reg".
964 * @match: Return non-zero if the node whose parent is at
965 * parentoffset in the FDT blob corresponds to a bus
966 * of this type, otherwise return zero. If NULL a match
968 * @count_cells:Count how many cells (be32 values) a node whose parent
969 * is at parentoffset in the FDT blob will require to
970 * represent its address (written to *addrc) & size
971 * (written to *sizec).
972 * @map: Map the address addr from the address space of this
973 * bus to that of its parent, making use of the ranges
974 * read from DT to an array at range. na and ns are the
975 * number of cells (be32 values) used to hold and address
976 * or size, respectively, for this bus. pna is the number
977 * of cells used to hold an address for the parent bus.
978 * Returns the address in the address space of the parent
980 * @translate: Update the value of the address cells at addr within an
981 * FDT by adding offset to it. na specifies the number of
982 * cells used to hold the address being translated. Returns
983 * zero on success, non-zero on error.
985 * Each bus type will include a struct of_bus in the of_busses array,
986 * providing implementations of some or all of the functions used to
987 * match the bus & handle address translation for its children.
991 const char *addresses
;
992 int (*match
)(const void *blob
, int parentoffset
);
993 void (*count_cells
)(const void *blob
, int parentoffset
,
994 int *addrc
, int *sizec
);
995 u64 (*map
)(fdt32_t
*addr
, const fdt32_t
*range
,
996 int na
, int ns
, int pna
);
997 int (*translate
)(fdt32_t
*addr
, u64 offset
, int na
);
1000 /* Default translator (generic bus) */
1001 void fdt_support_default_count_cells(const void *blob
, int parentoffset
,
1002 int *addrc
, int *sizec
)
1004 const fdt32_t
*prop
;
1007 *addrc
= fdt_address_cells(blob
, parentoffset
);
1010 prop
= fdt_getprop(blob
, parentoffset
, "#size-cells", NULL
);
1012 *sizec
= be32_to_cpup(prop
);
1018 static u64
of_bus_default_map(fdt32_t
*addr
, const fdt32_t
*range
,
1019 int na
, int ns
, int pna
)
1023 cp
= fdt_read_number(range
, na
);
1024 s
= fdt_read_number(range
+ na
+ pna
, ns
);
1025 da
= fdt_read_number(addr
, na
);
1027 debug("OF: default map, cp=%llu, s=%llu, da=%llu\n", cp
, s
, da
);
1029 if (da
< cp
|| da
>= (cp
+ s
))
1034 static int of_bus_default_translate(fdt32_t
*addr
, u64 offset
, int na
)
1036 u64 a
= fdt_read_number(addr
, na
);
1037 memset(addr
, 0, na
* 4);
1040 addr
[na
- 2] = cpu_to_fdt32(a
>> 32);
1041 addr
[na
- 1] = cpu_to_fdt32(a
& 0xffffffffu
);
1046 #ifdef CONFIG_OF_ISA_BUS
1048 /* ISA bus translator */
1049 static int of_bus_isa_match(const void *blob
, int parentoffset
)
1053 name
= fdt_get_name(blob
, parentoffset
, NULL
);
1057 return !strcmp(name
, "isa");
1060 static void of_bus_isa_count_cells(const void *blob
, int parentoffset
,
1061 int *addrc
, int *sizec
)
1069 static u64
of_bus_isa_map(fdt32_t
*addr
, const fdt32_t
*range
,
1070 int na
, int ns
, int pna
)
1074 /* Check address type match */
1075 if ((addr
[0] ^ range
[0]) & cpu_to_be32(1))
1078 cp
= fdt_read_number(range
+ 1, na
- 1);
1079 s
= fdt_read_number(range
+ na
+ pna
, ns
);
1080 da
= fdt_read_number(addr
+ 1, na
- 1);
1082 debug("OF: ISA map, cp=%llu, s=%llu, da=%llu\n", cp
, s
, da
);
1084 if (da
< cp
|| da
>= (cp
+ s
))
1089 static int of_bus_isa_translate(fdt32_t
*addr
, u64 offset
, int na
)
1091 return of_bus_default_translate(addr
+ 1, offset
, na
- 1);
1094 #endif /* CONFIG_OF_ISA_BUS */
1096 /* Array of bus specific translators */
1097 static struct of_bus of_busses
[] = {
1098 #ifdef CONFIG_OF_ISA_BUS
1103 .match
= of_bus_isa_match
,
1104 .count_cells
= of_bus_isa_count_cells
,
1105 .map
= of_bus_isa_map
,
1106 .translate
= of_bus_isa_translate
,
1108 #endif /* CONFIG_OF_ISA_BUS */
1113 .count_cells
= fdt_support_default_count_cells
,
1114 .map
= of_bus_default_map
,
1115 .translate
= of_bus_default_translate
,
1119 static struct of_bus
*of_match_bus(const void *blob
, int parentoffset
)
1123 if (ARRAY_SIZE(of_busses
) == 1)
1126 for (bus
= of_busses
; bus
; bus
++) {
1127 if (!bus
->match
|| bus
->match(blob
, parentoffset
))
1132 * We should always have matched the default bus at least, since
1133 * it has a NULL match field. If we didn't then it somehow isn't
1134 * in the of_busses array or something equally catastrophic has
1141 static int of_translate_one(const void *blob
, int parent
, struct of_bus
*bus
,
1142 struct of_bus
*pbus
, fdt32_t
*addr
,
1143 int na
, int ns
, int pna
, const char *rprop
)
1145 const fdt32_t
*ranges
;
1148 u64 offset
= OF_BAD_ADDR
;
1150 /* Normally, an absence of a "ranges" property means we are
1151 * crossing a non-translatable boundary, and thus the addresses
1152 * below the current not cannot be converted to CPU physical ones.
1153 * Unfortunately, while this is very clear in the spec, it's not
1154 * what Apple understood, and they do have things like /uni-n or
1155 * /ht nodes with no "ranges" property and a lot of perfectly
1156 * useable mapped devices below them. Thus we treat the absence of
1157 * "ranges" as equivalent to an empty "ranges" property which means
1158 * a 1:1 translation at that level. It's up to the caller not to try
1159 * to translate addresses that aren't supposed to be translated in
1160 * the first place. --BenH.
1162 ranges
= fdt_getprop(blob
, parent
, rprop
, &rlen
);
1163 if (ranges
== NULL
|| rlen
== 0) {
1164 offset
= fdt_read_number(addr
, na
);
1165 memset(addr
, 0, pna
* 4);
1166 debug("OF: no ranges, 1:1 translation\n");
1170 debug("OF: walking ranges...\n");
1172 /* Now walk through the ranges */
1174 rone
= na
+ pna
+ ns
;
1175 for (; rlen
>= rone
; rlen
-= rone
, ranges
+= rone
) {
1176 offset
= bus
->map(addr
, ranges
, na
, ns
, pna
);
1177 if (offset
!= OF_BAD_ADDR
)
1180 if (offset
== OF_BAD_ADDR
) {
1181 debug("OF: not found !\n");
1184 memcpy(addr
, ranges
+ na
, 4 * pna
);
1187 of_dump_addr("OF: parent translation for:", addr
, pna
);
1188 debug("OF: with offset: %llu\n", offset
);
1190 /* Translate it into parent bus space */
1191 return pbus
->translate(addr
, offset
, pna
);
1195 * Translate an address from the device-tree into a CPU physical address,
1196 * this walks up the tree and applies the various bus mappings on the
1199 * Note: We consider that crossing any level with #size-cells == 0 to mean
1200 * that translation is impossible (that is we are not dealing with a value
1201 * that can be mapped to a cpu physical address). This is not really specified
1202 * that way, but this is traditionally the way IBM at least do things
1204 static u64
__of_translate_address(const void *blob
, int node_offset
,
1205 const fdt32_t
*in_addr
, const char *rprop
)
1208 struct of_bus
*bus
, *pbus
;
1209 fdt32_t addr
[OF_MAX_ADDR_CELLS
];
1210 int na
, ns
, pna
, pns
;
1211 u64 result
= OF_BAD_ADDR
;
1213 debug("OF: ** translation for device %s **\n",
1214 fdt_get_name(blob
, node_offset
, NULL
));
1216 /* Get parent & match bus type */
1217 parent
= fdt_parent_offset(blob
, node_offset
);
1220 bus
= of_match_bus(blob
, parent
);
1222 /* Cound address cells & copy address locally */
1223 bus
->count_cells(blob
, parent
, &na
, &ns
);
1224 if (!OF_CHECK_COUNTS(na
, ns
)) {
1225 printf("%s: Bad cell count for %s\n", __FUNCTION__
,
1226 fdt_get_name(blob
, node_offset
, NULL
));
1229 memcpy(addr
, in_addr
, na
* 4);
1231 debug("OF: bus is %s (na=%d, ns=%d) on %s\n",
1232 bus
->name
, na
, ns
, fdt_get_name(blob
, parent
, NULL
));
1233 of_dump_addr("OF: translating address:", addr
, na
);
1237 /* Switch to parent bus */
1238 node_offset
= parent
;
1239 parent
= fdt_parent_offset(blob
, node_offset
);
1241 /* If root, we have finished */
1243 debug("OF: reached root node\n");
1244 result
= fdt_read_number(addr
, na
);
1248 /* Get new parent bus and counts */
1249 pbus
= of_match_bus(blob
, parent
);
1250 pbus
->count_cells(blob
, parent
, &pna
, &pns
);
1251 if (!OF_CHECK_COUNTS(pna
, pns
)) {
1252 printf("%s: Bad cell count for %s\n", __FUNCTION__
,
1253 fdt_get_name(blob
, node_offset
, NULL
));
1257 debug("OF: parent bus is %s (na=%d, ns=%d) on %s\n",
1258 pbus
->name
, pna
, pns
, fdt_get_name(blob
, parent
, NULL
));
1260 /* Apply bus translation */
1261 if (of_translate_one(blob
, node_offset
, bus
, pbus
,
1262 addr
, na
, ns
, pna
, rprop
))
1265 /* Complete the move up one level */
1270 of_dump_addr("OF: one level translation:", addr
, na
);
1277 u64
fdt_translate_address(const void *blob
, int node_offset
,
1278 const fdt32_t
*in_addr
)
1280 return __of_translate_address(blob
, node_offset
, in_addr
, "ranges");
1284 * fdt_node_offset_by_compat_reg: Find a node that matches compatiable and
1285 * who's reg property matches a physical cpu address
1287 * @blob: ptr to device tree
1288 * @compat: compatiable string to match
1289 * @compat_off: property name
1292 int fdt_node_offset_by_compat_reg(void *blob
, const char *compat
,
1293 phys_addr_t compat_off
)
1295 int len
, off
= fdt_node_offset_by_compatible(blob
, -1, compat
);
1296 while (off
!= -FDT_ERR_NOTFOUND
) {
1297 const fdt32_t
*reg
= fdt_getprop(blob
, off
, "reg", &len
);
1299 if (compat_off
== fdt_translate_address(blob
, off
, reg
))
1302 off
= fdt_node_offset_by_compatible(blob
, off
, compat
);
1305 return -FDT_ERR_NOTFOUND
;
1309 * fdt_alloc_phandle: Return next free phandle value
1311 * @blob: ptr to device tree
1313 int fdt_alloc_phandle(void *blob
)
1316 uint32_t phandle
= 0;
1318 for (offset
= fdt_next_node(blob
, -1, NULL
); offset
>= 0;
1319 offset
= fdt_next_node(blob
, offset
, NULL
)) {
1320 phandle
= max(phandle
, fdt_get_phandle(blob
, offset
));
1327 * fdt_set_phandle: Create a phandle property for the given node
1329 * @fdt: ptr to device tree
1330 * @nodeoffset: node to update
1331 * @phandle: phandle value to set (must be unique)
1333 int fdt_set_phandle(void *fdt
, int nodeoffset
, uint32_t phandle
)
1338 int off
= fdt_node_offset_by_phandle(fdt
, phandle
);
1340 if ((off
>= 0) && (off
!= nodeoffset
)) {
1343 fdt_get_path(fdt
, nodeoffset
, buf
, sizeof(buf
));
1344 printf("Trying to update node %s with phandle %u ",
1347 fdt_get_path(fdt
, off
, buf
, sizeof(buf
));
1348 printf("that already exists in node %s.\n", buf
);
1349 return -FDT_ERR_BADPHANDLE
;
1353 ret
= fdt_setprop_cell(fdt
, nodeoffset
, "phandle", phandle
);
1358 * For now, also set the deprecated "linux,phandle" property, so that we
1359 * don't break older kernels.
1361 ret
= fdt_setprop_cell(fdt
, nodeoffset
, "linux,phandle", phandle
);
1367 * fdt_create_phandle: Create a phandle property for the given node
1369 * @fdt: ptr to device tree
1370 * @nodeoffset: node to update
1372 unsigned int fdt_create_phandle(void *fdt
, int nodeoffset
)
1374 /* see if there is a phandle already */
1375 int phandle
= fdt_get_phandle(fdt
, nodeoffset
);
1377 /* if we got 0, means no phandle so create one */
1381 phandle
= fdt_alloc_phandle(fdt
);
1382 ret
= fdt_set_phandle(fdt
, nodeoffset
, phandle
);
1384 printf("Can't set phandle %u: %s\n", phandle
,
1394 * fdt_set_node_status: Set status for the given node
1396 * @fdt: ptr to device tree
1397 * @nodeoffset: node to update
1398 * @status: FDT_STATUS_OKAY, FDT_STATUS_DISABLED,
1399 * FDT_STATUS_FAIL, FDT_STATUS_FAIL_ERROR_CODE
1400 * @error_code: optional, only used if status is FDT_STATUS_FAIL_ERROR_CODE
1402 int fdt_set_node_status(void *fdt
, int nodeoffset
,
1403 enum fdt_status status
, unsigned int error_code
)
1412 case FDT_STATUS_OKAY
:
1413 ret
= fdt_setprop_string(fdt
, nodeoffset
, "status", "okay");
1415 case FDT_STATUS_DISABLED
:
1416 ret
= fdt_setprop_string(fdt
, nodeoffset
, "status", "disabled");
1418 case FDT_STATUS_FAIL
:
1419 ret
= fdt_setprop_string(fdt
, nodeoffset
, "status", "fail");
1421 case FDT_STATUS_FAIL_ERROR_CODE
:
1422 sprintf(buf
, "fail-%d", error_code
);
1423 ret
= fdt_setprop_string(fdt
, nodeoffset
, "status", buf
);
1426 printf("Invalid fdt status: %x\n", status
);
1435 * fdt_set_status_by_alias: Set status for the given node given an alias
1437 * @fdt: ptr to device tree
1438 * @alias: alias of node to update
1439 * @status: FDT_STATUS_OKAY, FDT_STATUS_DISABLED,
1440 * FDT_STATUS_FAIL, FDT_STATUS_FAIL_ERROR_CODE
1441 * @error_code: optional, only used if status is FDT_STATUS_FAIL_ERROR_CODE
1443 int fdt_set_status_by_alias(void *fdt
, const char* alias
,
1444 enum fdt_status status
, unsigned int error_code
)
1446 int offset
= fdt_path_offset(fdt
, alias
);
1448 return fdt_set_node_status(fdt
, offset
, status
, error_code
);
1451 #if defined(CONFIG_VIDEO) || defined(CONFIG_LCD)
1452 int fdt_add_edid(void *blob
, const char *compat
, unsigned char *edid_buf
)
1457 noff
= fdt_node_offset_by_compatible(blob
, -1, compat
);
1458 if (noff
!= -FDT_ERR_NOTFOUND
) {
1459 debug("%s: %s\n", fdt_get_name(blob
, noff
, 0), compat
);
1461 ret
= fdt_setprop(blob
, noff
, "edid", edid_buf
, 128);
1462 if (ret
== -FDT_ERR_NOSPACE
) {
1463 ret
= fdt_increase_size(blob
, 512);
1468 } else if (ret
< 0) {
1469 printf("Can't add property: %s\n", fdt_strerror(ret
));
1475 printf("Can't increase blob size: %s\n", fdt_strerror(ret
));
1481 * Verify the physical address of device tree node for a given alias
1483 * This function locates the device tree node of a given alias, and then
1484 * verifies that the physical address of that device matches the given
1485 * parameter. It displays a message if there is a mismatch.
1487 * Returns 1 on success, 0 on failure
1489 int fdt_verify_alias_address(void *fdt
, int anode
, const char *alias
, u64 addr
)
1496 path
= fdt_getprop(fdt
, anode
, alias
, NULL
);
1498 /* If there's no such alias, then it's not a failure */
1502 node
= fdt_path_offset(fdt
, path
);
1504 printf("Warning: device tree alias '%s' points to invalid "
1505 "node %s.\n", alias
, path
);
1509 reg
= fdt_getprop(fdt
, node
, "reg", &len
);
1511 printf("Warning: device tree node '%s' has no address.\n",
1516 dt_addr
= fdt_translate_address(fdt
, node
, reg
);
1517 if (addr
!= dt_addr
) {
1518 printf("Warning: U-Boot configured device %s at address %llu,\n"
1519 "but the device tree has it address %llx.\n",
1520 alias
, addr
, dt_addr
);
1528 * Returns the base address of an SOC or PCI node
1530 u64
fdt_get_base_address(const void *fdt
, int node
)
1533 const fdt32_t
*prop
;
1535 prop
= fdt_getprop(fdt
, node
, "reg", &size
);
1537 return prop
? fdt_translate_address(fdt
, node
, prop
) : 0;
1541 * Read a property of size <prop_len>. Currently only supports 1 or 2 cells.
1543 static int fdt_read_prop(const fdt32_t
*prop
, int prop_len
, int cell_off
,
1544 uint64_t *val
, int cells
)
1546 const fdt32_t
*prop32
= &prop
[cell_off
];
1547 const fdt64_t
*prop64
= (const fdt64_t
*)&prop
[cell_off
];
1549 if ((cell_off
+ cells
) > prop_len
)
1550 return -FDT_ERR_NOSPACE
;
1554 *val
= fdt32_to_cpu(*prop32
);
1557 *val
= fdt64_to_cpu(*prop64
);
1560 return -FDT_ERR_NOSPACE
;
1567 * fdt_read_range - Read a node's n'th range property
1569 * @fdt: ptr to device tree
1570 * @node: offset of node
1572 * @child_addr: pointer to storage for the "child address" field
1573 * @addr: pointer to storage for the CPU view translated physical start
1574 * @len: pointer to storage for the range length
1576 * Convenience function that reads and interprets a specific range out of
1577 * a number of the "ranges" property array.
1579 int fdt_read_range(void *fdt
, int node
, int n
, uint64_t *child_addr
,
1580 uint64_t *addr
, uint64_t *len
)
1582 int pnode
= fdt_parent_offset(fdt
, node
);
1583 const fdt32_t
*ranges
;
1592 * The "ranges" property is an array of
1593 * { <child address> <parent address> <size in child address space> }
1595 * All 3 elements can span a diffent number of cells. Fetch their size.
1597 pacells
= fdt_getprop_u32_default_node(fdt
, pnode
, 0, "#address-cells", 1);
1598 acells
= fdt_getprop_u32_default_node(fdt
, node
, 0, "#address-cells", 1);
1599 scells
= fdt_getprop_u32_default_node(fdt
, node
, 0, "#size-cells", 1);
1601 /* Now try to get the ranges property */
1602 ranges
= fdt_getprop(fdt
, node
, "ranges", &ranges_len
);
1604 return -FDT_ERR_NOTFOUND
;
1605 ranges_len
/= sizeof(uint32_t);
1607 /* Jump to the n'th entry */
1608 cell
= n
* (pacells
+ acells
+ scells
);
1610 /* Read <child address> */
1612 r
= fdt_read_prop(ranges
, ranges_len
, cell
, child_addr
,
1619 /* Read <parent address> */
1621 *addr
= fdt_translate_address(fdt
, node
, ranges
+ cell
);
1624 /* Read <size in child address space> */
1626 r
= fdt_read_prop(ranges
, ranges_len
, cell
, len
, scells
);
1635 * fdt_setup_simplefb_node - Fill and enable a simplefb node
1637 * @fdt: ptr to device tree
1638 * @node: offset of the simplefb node
1639 * @base_address: framebuffer base address
1640 * @width: width in pixels
1641 * @height: height in pixels
1642 * @stride: bytes per line
1643 * @format: pixel format string
1645 * Convenience function to fill and enable a simplefb node.
1647 int fdt_setup_simplefb_node(void *fdt
, int node
, u64 base_address
, u32 width
,
1648 u32 height
, u32 stride
, const char *format
)
1652 int i
, addrc
, sizec
, ret
;
1654 fdt_support_default_count_cells(fdt
, fdt_parent_offset(fdt
, node
),
1658 cells
[i
++] = cpu_to_fdt32(base_address
>> 32);
1659 cells
[i
++] = cpu_to_fdt32(base_address
);
1662 cells
[i
++] = cpu_to_fdt32(height
* stride
);
1664 ret
= fdt_setprop(fdt
, node
, "reg", cells
, sizeof(cells
[0]) * i
);
1668 snprintf(name
, sizeof(name
), "framebuffer@%llx", base_address
);
1669 ret
= fdt_set_name(fdt
, node
, name
);
1673 ret
= fdt_setprop_u32(fdt
, node
, "width", width
);
1677 ret
= fdt_setprop_u32(fdt
, node
, "height", height
);
1681 ret
= fdt_setprop_u32(fdt
, node
, "stride", stride
);
1685 ret
= fdt_setprop_string(fdt
, node
, "format", format
);
1689 ret
= fdt_setprop_string(fdt
, node
, "status", "okay");
1697 * Update native-mode in display-timings from display environment variable.
1698 * The node to update are specified by path.
1700 int fdt_fixup_display(void *blob
, const char *path
, const char *display
)
1704 if (!display
|| !path
)
1705 return -FDT_ERR_NOTFOUND
;
1707 toff
= fdt_path_offset(blob
, path
);
1709 toff
= fdt_subnode_offset(blob
, toff
, "display-timings");
1713 for (off
= fdt_first_subnode(blob
, toff
);
1715 off
= fdt_next_subnode(blob
, off
)) {
1716 uint32_t h
= fdt_get_phandle(blob
, off
);
1717 debug("%s:0x%x\n", fdt_get_name(blob
, off
, NULL
),
1719 if (strcasecmp(fdt_get_name(blob
, off
, NULL
), display
) == 0)
1720 return fdt_setprop_u32(blob
, toff
, "native-mode", h
);
1725 #ifdef CONFIG_OF_LIBFDT_OVERLAY
1727 * fdt_overlay_apply_verbose - Apply an overlay with verbose error reporting
1729 * @fdt: ptr to device tree
1730 * @fdto: ptr to device tree overlay
1732 * Convenience function to apply an overlay and display helpful messages
1733 * in the case of an error
1735 int fdt_overlay_apply_verbose(void *fdt
, void *fdto
)
1740 err
= fdt_path_offset(fdt
, "/__symbols__");
1741 has_symbols
= err
>= 0;
1743 err
= fdt_overlay_apply(fdt
, fdto
);
1745 printf("failed on fdt_overlay_apply(): %s\n",
1748 printf("base fdt does did not have a /__symbols__ node\n");
1749 printf("make sure you've compiled with -@\n");