From 006e73b9cafde9287912c4699091f3b1f07d3f97 Mon Sep 17 00:00:00 2001 From: Simon Glass Date: Thu, 27 Feb 2014 13:26:01 -0700 Subject: [PATCH 1/1] cros_ec: Add a function for reading a flash map entry A flash map describes the layout of flash memory in terms of offsets and sizes for each region. Add a function to read a flash map entry from the device tree. Reviewed-by: Che-Liang Chiou Signed-off-by: Simon Glass --- include/fdtdec.h | 18 ++++++++++++++++++ lib/fdtdec.c | 24 ++++++++++++++++++++++++ 2 files changed, 42 insertions(+) diff --git a/include/fdtdec.h b/include/fdtdec.h index 19bab79448..aa695df317 100644 --- a/include/fdtdec.h +++ b/include/fdtdec.h @@ -530,4 +530,22 @@ const u8 *fdtdec_locate_byte_array(const void *blob, int node, */ int fdtdec_decode_region(const void *blob, int node, const char *prop_name, void **ptrp, size_t *size); + +/* A flash map entry, containing an offset and length */ +struct fmap_entry { + uint32_t offset; + uint32_t length; +}; + +/** + * Read a flash entry from the fdt + * + * @param blob FDT blob + * @param node Offset of node to read + * @param name Name of node being read + * @param entry Place to put offset and size of this node + * @return 0 if ok, -ve on error + */ +int fdtdec_read_fmap_entry(const void *blob, int node, const char *name, + struct fmap_entry *entry); #endif diff --git a/lib/fdtdec.c b/lib/fdtdec.c index 1fecab3fbc..c54d97b893 100644 --- a/lib/fdtdec.c +++ b/lib/fdtdec.c @@ -617,3 +617,27 @@ int fdtdec_decode_region(const void *blob, int node, debug("%s: size=%zx\n", __func__, *size); return 0; } + +/** + * Read a flash entry from the fdt + * + * @param blob FDT blob + * @param node Offset of node to read + * @param name Name of node being read + * @param entry Place to put offset and size of this node + * @return 0 if ok, -ve on error + */ +int fdtdec_read_fmap_entry(const void *blob, int node, const char *name, + struct fmap_entry *entry) +{ + u32 reg[2]; + + if (fdtdec_get_int_array(blob, node, "reg", reg, 2)) { + debug("Node '%s' has bad/missing 'reg' property\n", name); + return -FDT_ERR_NOTFOUND; + } + entry->offset = reg[0]; + entry->length = reg[1]; + + return 0; +} -- 2.39.2