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fdt: Add fdtdec_get_addr_size() to read reg properties

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It is common to have a "reg = <address size>" property in the FDT.
Add a function to handle this, similar to the existing
fdtdec_get_addr();

Signed-off-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Simon Glass 2013-03-19 04:58:51 +00:00
parent 0ce033d258
commit 4397a2a80b
2 changed files with 35 additions and 5 deletions
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15
include/fdtdec.h
View file

@ -38,11 +38,13 @@
*/
#ifdef CONFIG_PHYS_64BIT
typedef u64 fdt_addr_t;
typedef u64 fdt_size_t;
#define FDT_ADDR_T_NONE (-1ULL)
#define fdt_addr_to_cpu(reg) be64_to_cpu(reg)
#define fdt_size_to_cpu(reg) be64_to_cpu(reg)
#else
typedef u32 fdt_addr_t;
typedef u32 fdt_size_t;
#define FDT_ADDR_T_NONE (-1U)
#define fdt_addr_to_cpu(reg) be32_to_cpu(reg)
#define fdt_size_to_cpu(reg) be32_to_cpu(reg)
@ -199,6 +201,19 @@ int fdtdec_next_compatible_subnode(const void *blob, int node,
fdt_addr_t fdtdec_get_addr(const void *blob, int node,
const char *prop_name);
/**
* Look up an address property in a node and return it as an address.
* The property must hold one address with a length. This is only tested
* on 32-bit machines.
*
* @param blob FDT blob
* @param node node to examine
* @param prop_name name of property to find
* @return address, if found, or FDT_ADDR_T_NONE if not
*/
fdt_addr_t fdtdec_get_addr_size(const void *blob, int node,
const char *prop_name, fdt_size_t *sizep);
/**
* Look up a 32-bit integer property in a node and return it. The property
* must have at least 4 bytes of data. The value of the first cell is

25
lib/fdtdec.c
View file

@ -68,25 +68,40 @@ const char *fdtdec_get_compatible(enum fdt_compat_id id)
return compat_names[id];
}
fdt_addr_t fdtdec_get_addr(const void *blob, int node,
const char *prop_name)
fdt_addr_t fdtdec_get_addr_size(const void *blob, int node,
const char *prop_name, fdt_size_t *sizep)
{
const fdt_addr_t *cell;
int len;
debug("%s: %s: ", __func__, prop_name);
cell = fdt_getprop(blob, node, prop_name, &len);
if (cell && (len == sizeof(fdt_addr_t) ||
len == sizeof(fdt_addr_t) * 2)) {
if (cell && ((!sizep && len == sizeof(fdt_addr_t)) ||
len == sizeof(fdt_addr_t) * 2)) {
fdt_addr_t addr = fdt_addr_to_cpu(*cell);
if (sizep) {
const fdt_size_t *size;
debug("%p\n", (void *)addr);
size = (fdt_size_t *)((char *)cell +
sizeof(fdt_addr_t));
*sizep = fdt_size_to_cpu(*size);
debug("addr=%p, size=%p\n", (void *)addr,
(void *)*sizep);
} else {
debug("%p\n", (void *)addr);
}
return addr;
}
debug("(not found)\n");
return FDT_ADDR_T_NONE;
}
fdt_addr_t fdtdec_get_addr(const void *blob, int node,
const char *prop_name)
{
return fdtdec_get_addr_size(blob, node, prop_name, NULL);
}
s32 fdtdec_get_int(const void *blob, int node, const char *prop_name,
s32 default_val)
{