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dma: mv_xor: Add support for DMA_INTERRUPT

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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>
This commit is contained in:
Lior Amsalem
2014-08-27 10:52:55 -03:00
committed by Vinod Koul
parent 37380b980e
commit 22843545b2
2 changed files with 40 additions and 5 deletions
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drivers/dma/mv_xor.h
+6 -5
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@@ -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