linux-kernel - Problems with DMA in the pxa2xx

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Date:	Mon, 07 May 2007 13:35:08 -0700
From:	Johnnie Peters <johnnie123@...izon.net>
To:	linux-kernel@...r.kernel.org
Subject: Problems with DMA in the pxa2xx_spi driver

Hi All,

I have written a SPI protocol driver to connect a data acquisition chip 
to a character based interface to read and write the device.  It works 
well in PIO mode and I am trying to get it to work with DMA.

To enable the DMA I am setting enable_dma in the pxa2xx_psi_chip struct 
and dma_burst_size to 16 in the pxa2xx_spi_chip structure under the 
board master file arch/arm/mach-pxa/xxxx.c.

Other than that I have not really changed anything.  I had assumed since 
DMA code has been in the driver a while that DMA would just work.  I 
must be missing some setup data I need.

Any help would be appreciated,

Johnnie

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