linux-kernel - Re: disabling dma/new ide interface 2.6.18-rc4-mm1

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Date:	Mon, 21 Aug 2006 17:24:52 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Bahadir Balban <bahadir.balban@...il.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: disabling dma/new ide interface 2.6.18-rc4-mm1

Ar Llu, 2006-08-21 am 15:27 +0100, ysgrifennodd Bahadir Balban:
> Hi,
> 
> I am trying to implement a basic ide driver based on ata_generic.c.
> Its a pio-only device.
> 
> How do I disable dma on the new interface? Changing ata_port_info fields?

ata_generic.c assumes the BIOS set up the timings and the device follows
PCI SFF. In those cases it already correctly handles PIO only
controllers.

If you are trying to write a driver for a non PCI motherboard device (Eg
on an embedded board) then drivers/ata/pata_qdi.c may be a better
example to follow as it sets up all the device ports by hand as a
platform device.

If you want PIO only then don't provide mwdma or udma mode masks in the
ata_port_info.

Alan

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