Using the loop feature of the DMA controller on MPC8544 DS

Timur Tabi timur at
Thu Mar 13 07:49:50 EST 2008

Sebastian Siewior wrote:

> Do you recommend another solution? Or did I miss an important part of
> the API that solves this kind of problem.

Well, I need to solve this problem myself, but I wasn't planning on doing it for
a while since I have a higher priority assignment at the moment.  My 8610 sound
driver does DMA all on its own and completely ignores Zhang's driver, so I need
to fix that.

Unfortunately, I'm not familiar with Zhang's driver at all (it's changed too
much since I last looked at it), so I don't know what the *best* way is.  For my
sound driver, I don't even know if I'll be able to leverage Zhang's driver at
all, since I need to use a specific DMA channel, and I need to control each of
the link descriptors.  Zhang's driver abstracts DMA too much.  So all I was
going to do is come up with a way to reserve channels.

Timur Tabi
Linux kernel developer at Freescale

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