rio_dma_prep_xfer
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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.

Return

pointer to DMA transaction descriptor if successful, error-valued pointer or NULL if failed.

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