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 sjg@chromium.org ---
drivers/block/blk-uclass.c | 29 +++++++++++++++++++++++++++++ include/blk.h | 30 ++++++++++++++++++++++++++++++ 2 files changed, 59 insertions(+)
diff --git a/drivers/block/blk-uclass.c b/drivers/block/blk-uclass.c index a37239e..6ba1026 100644 --- a/drivers/block/blk-uclass.c +++ b/drivers/block/blk-uclass.c @@ -165,6 +165,18 @@ static int get_desc(enum if_type if_type, int devnum, struct blk_desc **descp) return found_more ? -ENOENT : -ENODEV; }
+int blk_select_hwpart_devnum(enum if_type if_type, int devnum, int hwpart) +{ + struct udevice *dev; + int ret; + + ret = blk_get_device(if_type, devnum, &dev); + if (ret) + return ret; + + return blk_select_hwpart(dev, hwpart); +} + int blk_list_part(enum if_type if_type) { struct blk_desc *desc; @@ -291,6 +303,23 @@ ulong blk_write_devnum(enum if_type if_type, int devnum, lbaint_t start, return blk_dwrite(desc, start, blkcnt, buffer); }
+int blk_select_hwpart(struct udevice *dev, int hwpart) +{ + const struct blk_ops *ops = blk_get_ops(dev); + + if (!ops) + return -ENOSYS; + if (!ops->select_hwpart) + return 0; + + return ops->select_hwpart(dev, hwpart); +} + +int blk_dselect_hwpart(struct blk_desc *desc, int hwpart) +{ + return blk_select_hwpart(desc->bdev, hwpart); +} + int blk_first_device(int if_type, struct udevice **devp) { struct blk_desc *desc; diff --git a/include/blk.h b/include/blk.h index 19bc6a4..415c3a8 100644 --- a/include/blk.h +++ b/include/blk.h @@ -217,6 +217,25 @@ 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) @@ -335,6 +354,17 @@ 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 <errno.h> /*