dmaengine: Add an enum for the dmaengine alignment constraints

Most drivers need to set constraints on the buffer alignment for async tx
operations. However, even though it is documented, some drivers either use
a defined constant that is not matching what the alignment variable expects
(like DMA_BUSWIDTH_* constants) or fill the alignment in bytes instead of
power of two.

Add a new enum for these alignments that matches what the framework
expects, and convert the drivers to it.

Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>

1 files changed, 20 insertions, 5 deletions

diff --git a/include/linux/dmaengine.h b/include/linux/dmaengine.h
index e2f5eb419976..03ed832adbc2 100644
--- a/include/linux/dmaengine.h
+++ b/include/linux/dmaengine.h
@@ -585,6 +585,20 @@ struct dma_tx_state {
 };
 
 /**
+ * enum dmaengine_alignment - defines alignment of the DMA async tx
+ * buffers
+ */
+enum dmaengine_alignment {
+        DMAENGINE_ALIGN_1_BYTE = 0,
+        DMAENGINE_ALIGN_2_BYTES = 1,
+        DMAENGINE_ALIGN_4_BYTES = 2,
+        DMAENGINE_ALIGN_8_BYTES = 3,
+        DMAENGINE_ALIGN_16_BYTES = 4,
+        DMAENGINE_ALIGN_32_BYTES = 5,
+        DMAENGINE_ALIGN_64_BYTES = 6,
+};
+
+/**
  * struct dma_device - info on the entity supplying DMA services
  * @chancnt: how many DMA channels are supported
  * @privatecnt: how many DMA channels are requested by dma_request_channel
@@ -645,10 +659,10 @@ struct dma_device {
         dma_cap_mask_t  cap_mask;
         unsigned short max_xor;
         unsigned short max_pq;
-        u8 copy_align;
-        u8 xor_align;
-        u8 pq_align;
-        u8 fill_align;
+        enum dmaengine_alignment copy_align;
+        enum dmaengine_alignment xor_align;
+        enum dmaengine_alignment pq_align;
+        enum dmaengine_alignment fill_align;
         #define DMA_HAS_PQ_CONTINUE (1 << 15)
 
         int dev_id;
@@ -833,7 +847,8 @@ static inline dma_cookie_t dmaengine_submit(struct dma_async_tx_descriptor *desc
         return desc->tx_submit(desc);
 }
 
-static inline bool dmaengine_check_align(u8 align, size_t off1, size_t off2, size_t len)
+static inline bool dmaengine_check_align(enum dmaengine_alignment align,
+                                         size_t off1, size_t off2, size_t len)
 {
         size_t mask;