[PATCH RFC 1/2] MUSB: CPPI 4.1 DMA driver (take 4)
Gupta, Ajay Kumar
ajay.gupta at ti.com
Mon Nov 2 06:24:00 EST 2009
> > > If it's a USB DMA device (from the patches I can find, that seems to
> > > the case) then why can't it live in drivers/usb or drivers/dma ?
> > CPPI4.1 DMA engine can be used either by USB or by Ethernet interface
> > currently only USB is using it but in future even Ethernet devices may
> use it.
> > Infact, there is a TI platform (not in mainline), where both USB and
> Ethernet interface is using CPPI4.1 DMA.
> you might want to provide support for it via drivers/dma and for the
> musb stuff, you just add the wrappers musb uses. See how tusb6010_omap.c
> uses OMAP's system dma which is also used by any other driver which
> requests a dma channel.
So if we want to move CPPI4.1 DMA core to drivers/dma then it has to follow
standard set of DMA APIs (right?), which I afraid, may not be done in current implementation.
More information about the linux-arm-kernel