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fdt: introduce fdt_verify_alias_address() and fdt_get_base_address()

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Introduce two functions, fdt_verify_alias_address() and
fdt_get_base_address(), which can be used to verify the physical address
of a device in a device tree.

fdt_get_base_address() returns the base address of an SOC or PCI node.

fdt_verify_alias_address() prints a message if the address of a node
specified by an alias does not match the given physical address.

Signed-off-by: Timur Tabi <timur@freescale.com>
This commit is contained in:
Timur Tabi 2011-05-03 13:24:07 -05:00 committed by Gerald Van Baren
parent d1c6314887
commit bb682001f1
2 changed files with 71 additions and 0 deletions
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67
common/fdt_support.c
View File

@ -1223,3 +1223,70 @@ err_size:
return ret;
}
#endif
/*
* Verify the physical address of device tree node for a given alias
*
* This function locates the device tree node of a given alias, and then
* verifies that the physical address of that device matches the given
* parameter. It displays a message if there is a mismatch.
*
* Returns 1 on success, 0 on failure
*/
int fdt_verify_alias_address(void *fdt, int anode, const char *alias, u64 addr)
{
const char *path;
const u32 *reg;
int node, len;
u64 dt_addr;
path = fdt_getprop(fdt, anode, alias, NULL);
if (!path) {
/* If there's no such alias, then it's not a failure */
return 1;
}
node = fdt_path_offset(fdt, path);
if (node < 0) {
printf("Warning: device tree alias '%s' points to invalid "
"node %s.\n", alias, path);
return 0;
}
reg = fdt_getprop(fdt, node, "reg", &len);
if (!reg) {
printf("Warning: device tree node '%s' has no address.\n",
path);
return 0;
}
dt_addr = fdt_translate_address(fdt, node, reg);
if (addr != dt_addr) {
printf("Warning: U-Boot configured device %s at address %llx,\n"
" but the device tree has it address %llx.\n",
alias, addr, dt_addr);
return 0;
}
return 1;
}
/*
* Returns the base address of an SOC or PCI node
*/
u64 fdt_get_base_address(void *fdt, int node)
{
int size;
u32 naddr;
const u32 *prop;
prop = fdt_getprop(fdt, node, "#address-cells", &size);
if (prop && size == 4)
naddr = *prop;
else
naddr = 2;
prop = fdt_getprop(fdt, node, "ranges", &size);
return prop ? fdt_translate_address(fdt, node, prop + naddr) : 0;
}

4
include/fdt_support.h
View File

@ -90,5 +90,9 @@ int fdt_node_offset_by_compat_reg(void *blob, const char *compat,
int fdt_alloc_phandle(void *blob);
int fdt_add_edid(void *blob, const char *compat, unsigned char *buf);
int fdt_verify_alias_address(void *fdt, int anode, const char *alias,
u64 addr);
u64 fdt_get_base_address(void *fdt, int node);
#endif /* ifdef CONFIG_OF_LIBFDT */
#endif /* ifndef __FDT_SUPPORT_H */