'\" t
.\"     Title: rio_dma_prep_xfer
.\"    Author: 
.\" Generator: DocBook XSL Stylesheets v1.79.1 <http://docbook.sf.net/>
.\"      Date: June 2017
.\"    Manual: RapidIO driver interface
.\"    Source: Kernel Hackers Manual 4.11.3
.\"  Language: English
.\"
.TH "RIO_DMA_PREP_XFER" "9" "June 2017" "Kernel Hackers Manual 4\&.11\&" "RapidIO driver interface"
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.SH "NAME"
rio_dma_prep_xfer \- RapidIO specific wrapper for device_prep_slave_sg callback defined by DMAENGINE\&.
.SH "SYNOPSIS"
.HP \w'struct\ dma_async_tx_descriptor\ *\ rio_dma_prep_xfer('u
.BI "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" ");"
.SH "ARGUMENTS"
.PP
\fIstruct dma_chan * dchan\fR
.RS 4
DMA channel to configure
.RE
.PP
\fIu16 destid\fR
.RS 4
target RapidIO device destination ID
.RE
.PP
\fIstruct rio_dma_data * data\fR
.RS 4
RIO specific data descriptor
.RE
.PP
\fIenum dma_transfer_direction direction\fR
.RS 4
DMA data transfer direction (TO or FROM the device)
.RE
.PP
\fIunsigned long flags\fR
.RS 4
dmaengine defined flags
.RE
.SH "DESCRIPTION"
.PP
Initializes RapidIO capable DMA channel for the specified data transfer\&. Uses DMA channel private extension to pass information related to remote target RIO device\&.
.SH "RETURN"
.PP
pointer to DMA transaction descriptor if successful, error\-valued pointer or NULL if failed\&.
.SH "AUTHOR"
.PP
\fBMatt Porter\fR <\&mporter@kernel.crashing.org\&>, <\&mporter@mvista.com\&>
.RS 4
Author.
.RE
.SH "COPYRIGHT"
.br