diff options
Diffstat (limited to 'include/blk.h')
| -rw-r--r-- | include/blk.h | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/include/blk.h b/include/blk.h index 8986e953e5a..b819f97c2f1 100644 --- a/include/blk.h +++ b/include/blk.h @@ -7,6 +7,7 @@ #ifndef BLK_H #define BLK_H +#include <bouncebuf.h> #include <dm/uclass-id.h> #include <efi.h> @@ -260,6 +261,24 @@ struct blk_ops { * @return 0 if OK, -ve on error */ int (*select_hwpart)(struct udevice *dev, int hwpart); + +#if IS_ENABLED(CONFIG_BOUNCE_BUFFER) + /** + * buffer_aligned() - test memory alignment of block operation buffer + * + * Some devices have limited DMA capabilities and require that the + * buffers passed to them fit specific properties. This optional + * callback can be used to indicate whether a buffer alignment is + * suitable for the device DMA or not, and trigger use of generic + * bounce buffer implementation to help use of unsuitable buffers + * at the expense of performance degradation. + * + * @dev: Block device associated with the request + * @state: Bounce buffer state + * @return 1 if OK, 0 if unaligned + */ + int (*buffer_aligned)(struct udevice *dev, struct bounce_buffer *state); +#endif /* CONFIG_BOUNCE_BUFFER */ }; /* |