rio_dma_prep_xfer (9) Linux Manual Page
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.
Return
pointer to DMA transaction descriptor if successful, error-valued pointer or NULL if failed.
Author
Matt Porter <mporter [at] kernel.crashing.org>, <mporter [at] mvista.com>
- Author.