From cd0fb55b640b2991c1d29122d252a360037ed903 Mon Sep 17 00:00:00 2001 From: Simon Glass Date: Sun, 1 May 2016 13:52:30 -0600 Subject: dm: blk: Add functions to select a hardware partition The block device uclass does not currently support selecting a particular hardware partition but this is needed for MMC. Add it so that the blk API can support MMC properly. Signed-off-by: Simon Glass --- include/blk.h | 30 ++++++++++++++++++++++++++++++ 1 file changed, 30 insertions(+) (limited to 'include') diff --git a/include/blk.h b/include/blk.h index 82b2c1a706..3fa373e208 100644 --- a/include/blk.h +++ b/include/blk.h @@ -211,6 +211,25 @@ struct blk_ops { */ unsigned long (*erase)(struct udevice *dev, lbaint_t start, lbaint_t blkcnt); + + /** + * select_hwpart() - select a particular hardware partition + * + * Some devices (e.g. MMC) can support partitioning at the hardware + * level. This is quite separate from the normal idea of + * software-based partitions. MMC hardware partitions must be + * explicitly selected. Once selected only the region of the device + * covered by that partition is accessible. + * + * The MMC standard provides for two boot partitions (numbered 1 and 2), + * rpmb (3), and up to 4 addition general-purpose partitions (4-7). + * + * @desc: Block device to update + * @hwpart: Hardware partition number to select. 0 means the raw + * device, 1 is the first partition, 2 is the second, etc. + * @return 0 if OK, -ve on error + */ + int (*select_hwpart)(struct udevice *dev, int hwpart); }; #define blk_get_ops(dev) ((struct blk_ops *)(dev)->driver->ops) @@ -329,6 +348,17 @@ int blk_unbind_all(int if_type); */ int blk_find_max_devnum(enum if_type if_type); +/** + * blk_select_hwpart() - select a hardware partition + * + * Select a hardware partition if the device supports it (typically MMC does) + * + * @dev: Device to update + * @hwpart: Partition number to select + * @return 0 if OK, -ve on error + */ +int blk_select_hwpart(struct udevice *dev, int hwpart); + #else #include /* -- cgit v1.2.1