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authorSimon Glass <sjg@chromium.org>2012-10-25 16:31:00 +0000
committerGerald Van Baren <gvb@unssw.com>2012-11-12 23:00:34 -0500
commitf20c461984c3d986fde037d4c5bf600aa0497676 (patch)
treebd00ee8c90b160fa69bcddceaa5641c867f03a03 /include/fdtdec.h
parent332ab0d54aaa5b8b27096996d10c8c6183c6972c (diff)
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fdt: Add fdtdec_decode_region() to decode memory region
A memory region has a start and a size and is often specified in a node by a 'reg' property. Add a function to decode this information from the fdt. Signed-off-by: Simon Glass <sjg@chromium.org>
Diffstat (limited to 'include/fdtdec.h')
-rw-r--r--include/fdtdec.h19
1 files changed, 19 insertions, 0 deletions
diff --git a/include/fdtdec.h b/include/fdtdec.h
index e828662..341e6a1 100644
--- a/include/fdtdec.h
+++ b/include/fdtdec.h
@@ -40,10 +40,12 @@
typedef u64 fdt_addr_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;
#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)
#endif
/* Information obtained about memory from the FDT */
@@ -408,4 +410,21 @@ int fdtdec_get_byte_array(const void *blob, int node, const char *prop_name,
*/
const u8 *fdtdec_locate_byte_array(const void *blob, int node,
const char *prop_name, int count);
+
+/**
+ * Look up a property in a node which contains a memory region address and
+ * size. Then return a pointer to this 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
+ * @param ptrp returns pointer to region, or NULL if no address
+ * @param size returns size of region
+ * @return 0 if ok, -1 on error (propery not found)
+ */
+int fdtdec_decode_region(const void *blob, int node,
+ const char *prop_name, void **ptrp, size_t *size);
#endif