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| author | Siva Yerramreddy <yshivakrishna@gmail.com> | 2015-09-30 03:09:37 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2015-10-04 13:46:06 +0200 |
| commit | ff39988abd70bcd1b14a4c81f2d102e67b8db580 (patch) | |
| tree | a51169c4006d757558c9415103d93440d0e8cd8f /include | |
| parent | iommu: Allow iova to be used without requiring IOMMU_SUPPORT (diff) | |
| download | linux-ff39988abd70bcd1b14a4c81f2d102e67b8db580.tar.xz linux-ff39988abd70bcd1b14a4c81f2d102e67b8db580.zip | |
dma: Add support to program MIC x100 status descriptiors
The MIC X100 DMA engine has a special status descriptor which writes
an 8 byte value to a destination location. This is used to signal
completion of all DMA descriptors prior to the status descriptor.
This patch add a new DMA engine API which enables updating a
destination address with an 8 byte immediate data value.
Reviewed-by: Nikhil Rao <nikhil.rao@intel.com>
Reviewed-by: Ashutosh Dixit <ashutosh.dixit@intel.com>
Signed-off-by: Lawrynowicz, Jacek <jacek.lawrynowicz@intel.com>
Signed-off-by: Sudeep Dutt <sudeep.dutt@intel.com>
Signed-off-by: Siva Yerramreddy <yshivakrishna@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/dmaengine.h | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/include/linux/dmaengine.h b/include/linux/dmaengine.h index 7ea9184eaa13..c47c68e535e8 100644 --- a/include/linux/dmaengine.h +++ b/include/linux/dmaengine.h @@ -645,6 +645,7 @@ enum dmaengine_alignment { * The function takes a buffer of size buf_len. The callback function will * be called after period_len bytes have been transferred. * @device_prep_interleaved_dma: Transfer expression in a generic way. + * @device_prep_dma_imm_data: DMA's 8 byte immediate data to the dst address * @device_config: Pushes a new configuration to a channel, return 0 or an error * code * @device_pause: Pauses any transfer happening on a channel. Returns @@ -727,6 +728,9 @@ struct dma_device { struct dma_async_tx_descriptor *(*device_prep_interleaved_dma)( struct dma_chan *chan, struct dma_interleaved_template *xt, unsigned long flags); + struct dma_async_tx_descriptor *(*device_prep_dma_imm_data)( + struct dma_chan *chan, dma_addr_t dst, u64 data, + unsigned long flags); int (*device_config)(struct dma_chan *chan, struct dma_slave_config *config); |