From f20c461984c3d986fde037d4c5bf600aa0497676 Mon Sep 17 00:00:00 2001 From: Simon Glass Date: Thu, 25 Oct 2012 16:31:00 +0000 Subject: 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 --- include/fdtdec.h | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+) (limited to 'include') 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 -- cgit v1.1