ISA dma on 4xx

ISA dma on 4xx

[Paul Mackerras]

Is anyone using a pc-style southbridge chip in a 4xx-based system?

I am thinking that the split that we currently have in linuxppc-2.5,
where asm/dma.h includes either ppc4xx_dma.h or ppc_isa_dma.h, is not
the best way to do things, because we might want to use the ISA dma
functions on a 4xx system.

Does anyone use the 4xx dma controller with some device that is
normally connected to an ISA bus?  That is, is there a need for the
4xx dma functions to provide the same interface as the ISA dma
functions?

Paul.

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Re: ISA dma on 4xx

["David Müller (ELSOFT AG)"]

Hello


Paul Mackerras wrote:

> Is anyone using a pc-style southbridge chip in a 4xx-based system?
>
> I am thinking that the split that we currently have in linuxppc-2.5,
> where asm/dma.h includes either ppc4xx_dma.h or ppc_isa_dma.h, is not
> the best way to do things, because we might want to use the ISA dma
> functions on a 4xx system.

Yes, we are using ISA DMA in combination with a PPC405GP. Currently
ISA DMA is used for things like floppy or IrDA (implemented in a SuperIO
chip).

>
> Does anyone use the 4xx dma controller with some device that is
> normally connected to an ISA bus?  That is, is there a need for the
> 4xx dma functions to provide the same interface as the ISA dma
> functions?
>
> Paul.
>
Am i right that you want to create a common interface capable of
handling 4xx DMA and ISA DMA at the same time?


Dave


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