Subject: Re: using dma engine on MPC8555 processor

From: wael showair <[email-masked]>
Date: Wed, 28 Jan 2009 02:52:06 -0800 (PST)

now I can understand that the file of the fsldma.c is the driver of the DMA
engine that contains also a test the DMA.
I noticed that it contains 2 module init functions:
subsys_initcall(of_fsl_dma_chan_init);
subsys_initcall(of_fsl_dma_init);

Also it contains two probe functions:
static int __devinit of_fsl_dma_chan_probe(struct of_device *dev,const
struct of_device_id *match)
static int __devinit of_fsl_dma_probe(struct of_device *dev,const struct
of_device_id *match)

How can i make these 2 probe functions work,
i also noticed that fsldma.c cant be built as a module
either it is built-in or not built.

is there something i should write in the command line to let fsldma works &
tests the DMA engine i have on my board.

also i want to know the module "dmatest",what does it test exactly? can it
test the DMA engine or not?
thanks for your help

wael showair wrote:
> 
> Hi All,
> i have an evaluation board with MPC8555 processor.
> linux kernel 2.6.27
> i have read the Documentation of my board, i found that it contains DMA
> engine.
> i know that there fsldma.c & fsldma.h
> all my target is that i want to test the DMA on my board.
> i want to transfer data from source to destination & i imagine that the
> DMA will raise an interrupt after it finishes the transfer.
> 
> so i believe there must be some APIs related to the DMA engine which do
> the following:
> 1. initialize the DMA by determining the src & dest addresses. Also
> determines which channel to use.
> 2. register an interrupt handler for the DMA interrupt line.
> 3. fire the DMA.
> 
> where can i find these APIs, or i m missing something?
> thanks in advance for ur help
> 

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