diff options
Diffstat (limited to 'include/scsi.h')
| -rw-r--r-- | include/scsi.h | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/include/scsi.h b/include/scsi.h index 9efefea99b..ee9d622680 100644 --- a/include/scsi.h +++ b/include/scsi.h @@ -7,6 +7,7 @@ #define _SCSI_H #include <asm/cache.h> +#include <bouncebuf.h> #include <linux/dma-direction.h> /* Fix this to the maximum */ @@ -298,6 +299,24 @@ struct scsi_ops { * @return 0 if OK, -ve on error */ int (*bus_reset)(struct udevice *dev); + +#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 */ }; #define scsi_get_ops(dev) ((struct scsi_ops *)(dev)->driver->ops) |