lhthanh wrote:
Thanks for your explaination! So if I want to transfer a buffer of data
from a single I/O port, will not DMA framework
also be able ?
No.
Have I to write aother driver?
Yes.
Actually, I don't want write all because there are serveral DMA code at
hand. I only want to use a framework instead of re-writing.
There is no framework for what you want to do. There is only one other
driver that does what you want (sound/soc/fsl/fsl_dma.c), and that is a
complicated driver that does many things besides transferring data to an
I/O port.
And I afraid that I can not write code which assure sharing DMA channels.
Look at arch/powerpc/boot/dts/mpc8610_hpcd.dts. The DMA channels that
are needed by the 8610 audio driver have a different 'compatible'
property. This is how you prevent the generic DMA driver from using a
channel that you want.
I'm afraid that you're going to have to study the DMA programming model,
and my device driver, and write a brand new driver from scratch.
Thank Scott and Timur very much! I will study more DMA driver and come
back later. :)
Regard!
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