[alsa-devel] [PATCH 3/3] Add ALSA driver for Atmel AC97 controller

Hans-Christian Egtvedt hans-christian.egtvedt at atmel.com
Wed Feb 4 14:21:30 CET 2009

On Wed, 04 Feb 2009 14:11:38 +0100
Sedji Gaouaou <sedji.gaouaou at atmel.com> wrote:

> Hans-Christian Egtvedt a écrit :
> >> Actually there are some differences, AT91 does not use a DMA, we
> >> use a specific IP(PDC) to transer the data...
> >>
> > 
> > PDC is still DMA ;) I guess AT91 uses the "old" PDC and not PDCA?
> > 
> I don't know about any PDCA...so yes I guess we are using the old
> one...

PDCA is a centralized version of PDC, it might be we only use it on
AVR32 devices for the time being.

> >> Maybe we could share the same code we some #define in it?
> >>
> > 
> > Yes, it should be simple to add an additional #define in kconfig.
> > 
> > config SND_ATMEL_AC97C_PDC
> > 	bool
> > 	depends on ARCH_AT91
> > 
> > And then have some ifdefs/else around the DMA stuff, much like the
> > atmel-mci driver does today.
> > 
> I don't know which solution is the dest: ifdef or as Mark's one...

The PDC DMA is very simple, so will not add a lot of additional
bits'n'bytes. So IMHO I think going for all in one source would be the

Should I move the AC97C driver to sound/drivers instead then, and then
leave it open for you to implement the extra parts for AT91 devices?

Best regards,
Hans-Christian Egtvedt

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