[PATCH v3] dmaengine: mxs-dma: add dma support for i.MX23/28

[w.sang@pengutronix.de (Wolfram Sang)]

On Mon, Feb 21, 2011 at 06:21:39PM +0800, Shawn Guo wrote:
> This patch adds dma support for Freescale MXS-based SoC i.MX23/28,
> including apbh-dma and apbx-dma.
> 
> * apbh-dma and apbx-dma are supported in the driver as two mxs-dma
>   instances.
> 
> * apbh-dma is different between mx23 and mx28, hardware version
>   register is used to differentiate.
> 
> * mxs-dma supports pio function besides data transfer.  The driver
>   uses dma_data_direction DMA_NONE to identify the pio mode, and
>   steals sgl and sg_len to get pio words and numbers from clients.
> 
> * mxs dmaengine has some very specific features, like sense function
>   and the special NAND support (nand_lock, nand_wait4ready).  These
>   are too specific to implemented in generic dmaengine driver.
> 
> * The driver refers to imx-sdma and only a single descriptor is
>   statically assigned to each channel.
> 
> Signed-off-by: Shawn Guo <shawn.guo@freescale.com>

Tested-by: Wolfram Sang <w.sang@pengutronix.de>

-- 
Pengutronix e.K.                           | Wolfram Sang                |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |
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