Name
rio_dma_prep_xfer —
RapidIO specific wrapper for device_prep_slave_sg callback defined by DMAENGINE.
Synopsis
struct dma_async_tx_descriptor * rio_dma_prep_xfer ( | struct dma_chan * dchan, |
| | u16 destid, |
| | struct rio_dma_data * data, |
| | enum dma_transfer_direction direction, |
| | unsigned long flags); |
Arguments
dchan
DMA channel to configure
destid
target RapidIO device destination ID
data
RIO specific data descriptor
direction
DMA data transfer direction (TO or FROM the device)
flags
dmaengine defined flags
Description
Initializes RapidIO capable DMA channel for the specified data transfer.
Uses DMA channel private extension to pass information related to remote
target RIO device.
Returns pointer to DMA transaction descriptor or NULL if failed.