dma: mv_xor: Add support for DMA_INTERRUPT
The driver is capable of supporting DMA_INTERRUPT by issuing a dummy 128-byte
transfer. This helps removing a poll in the async_tx stack, replacing it with
a completion interrupt.
Signed-off-by: Lior Amsalem <alior@marvell.com>
Signed-off-by: Ezequiel Garcia <ezequiel.garcia@free-electrons.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
diff --git a/drivers/dma/mv_xor.h b/drivers/dma/mv_xor.h
index de40036..78edc7e 100644
--- a/drivers/dma/mv_xor.h
+++ b/drivers/dma/mv_xor.h
@@ -28,6 +28,9 @@
#define MV_XOR_THRESHOLD 1
#define MV_XOR_MAX_CHANNELS 2
+#define MV_XOR_MIN_BYTE_COUNT SZ_128
+#define MV_XOR_MAX_BYTE_COUNT (SZ_16M - 1)
+
/* Values for the XOR_CONFIG register */
#define XOR_OPERATION_MODE_XOR 0
#define XOR_OPERATION_MODE_MEMCPY 2
@@ -116,6 +119,9 @@
struct list_head all_slots;
int slots_allocated;
struct tasklet_struct irq_tasklet;
+ char dummy_src[MV_XOR_MIN_BYTE_COUNT];
+ char dummy_dst[MV_XOR_MIN_BYTE_COUNT];
+ dma_addr_t dummy_src_addr, dummy_dst_addr;
};
/**
@@ -184,9 +190,4 @@
#define mv_hw_desc_slot_idx(hw_desc, idx) \
((void *)(((unsigned long)hw_desc) + ((idx) << 5)))
-#define MV_XOR_MIN_BYTE_COUNT (128)
-#define XOR_MAX_BYTE_COUNT ((16 * 1024 * 1024) - 1)
-#define MV_XOR_MAX_BYTE_COUNT XOR_MAX_BYTE_COUNT
-
-
#endif