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authorLior Amsalem <alior@marvell.com>2014-08-27 17:52:55 +0400
committerVinod Koul <vinod.koul@intel.com>2014-09-23 18:47:01 +0400
commit22843545b20007ae33bc3774043303e0b44e3d65 (patch)
tree9137a6256f925f8fcce6cb7bec5aafd60208025a /drivers/dma/mv_xor.h
parent37380b980e2db2e0dfdb920140c75f3cf2e98a27 (diff)
downloadlinux-22843545b20007ae33bc3774043303e0b44e3d65.tar.xz
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>
Diffstat (limited to 'drivers/dma/mv_xor.h')
-rw-r--r--drivers/dma/mv_xor.h11
1 files changed, 6 insertions, 5 deletions
diff --git a/drivers/dma/mv_xor.h b/drivers/dma/mv_xor.h
index de400365bc49..78edc7e44569 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 mv_xor_chan {
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 @@ struct mv_xor_desc {
#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