dfu: mmc: add support for in-partition offset

Add possibility to define a part of partition as a separate DFU entity.
This allows to have more than one items on the given partition.

The real use case for this option is TM2 board. It can use u-boot stored
as Linux kernel on the defined partition (as RAW data) and load the real
kernel from the same partition, but stored under the certain offset.

Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Acked-by: Lukasz Majewski <lukma@denx.de>

diff --git a/drivers/dfu/dfu_mmc.c b/drivers/dfu/dfu_mmc.c
index 403fd5351d7738f1175dd5da2bc82829fb4d86dc..5b551f6ae115c91f4757f150fe491e6d77e57fe1 100644 (file)
--- a/drivers/dfu/dfu_mmc.c
+++ b/drivers/dfu/dfu_mmc.c
@@ -352,6 +352,7 @@ int dfu_fill_entity_mmc(struct dfu_entity *dfu, char *devstr, char *s)
                struct blk_desc *blk_dev = mmc_get_blk_desc(mmc);
                int mmcdev = second_arg;
                int mmcpart = third_arg;
+               int offset = 0;
 
                if (part_get_info(blk_dev, mmcpart, &partinfo) != 0) {
                        pr_err("Couldn't find part #%d on mmc device #%d\n",
@@ -359,9 +360,17 @@ int dfu_fill_entity_mmc(struct dfu_entity *dfu, char *devstr, char *s)
                        return -ENODEV;
                }
 
+               /*
+                * Check for an extra entry at dfu_alt_info env variable
+                * specifying the mmc HW defined partition number
+                */
+               if (s)
+                       if (!strcmp(strsep(&s, " "), "offset"))
+                               offset = simple_strtoul(s, NULL, 0);
+
                dfu->layout                     = DFU_RAW_ADDR;
-               dfu->data.mmc.lba_start         = partinfo.start;
-               dfu->data.mmc.lba_size          = partinfo.size;
+               dfu->data.mmc.lba_start         = partinfo.start + offset;
+               dfu->data.mmc.lba_size          = partinfo.size-offset;
                dfu->data.mmc.lba_blk_size      = partinfo.blksz;
        } else if (!strcmp(entity_type, "fat")) {
                dfu->layout = DFU_FS_FAT;