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authorJassi Brar <jaswinder.singh@linaro.org>2011-10-13 12:33:30 +0530
committerVinod Koul <vinod.koul@linux.intel.com>2011-11-18 12:16:24 +0530
commitb14dab792dee3245b628e046d80a7fad5573fea6 (patch)
treec77574d19be7c150b57bd9a9b0184580c733621b /init/noinitramfs.c
parente0d23ef29ed637dc6bd739f590985746d9ad9caa (diff)
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DMAEngine: Define interleaved transfer request api
Define a new api that could be used for doing fancy data transfers like interleaved to contiguous copy and vice-versa. Traditional SG_list based transfers tend to be very inefficient in such cases as where the interleave and chunk are only a few bytes, which call for a very condensed api to convey pattern of the transfer. This api supports all 4 variants of scatter-gather and contiguous transfer. Of course, neither can this api help transfers that don't lend to DMA by nature, i.e, scattered tiny read/writes with no periodic pattern. Also since now we support SLAVE channels that might not provide device_prep_slave_sg callback but device_prep_interleaved_dma, remove the BUG_ON check. Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org> Acked-by: Barry Song <Baohua.Song@csr.com> [renamed dmaxfer_template to dma_interleaved_template did fixup after the enum dma_transfer_merge] Signed-off-by: Vinod Koul <vinod.koul@linux.intel.com>
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