Subject: Re: disabling dma/new ide interface 2.6.18-rc4-mm1
From: Alan Cox <alan@lxorguk.ukuu.org.uk>
To: Bahadir Balban <bahadir.balban@gmail.com>
Cc: linux-kernel@vger.kernel.org
In-Reply-To: <7ac1e90c0608210727m1c5375b9xb936168c877084c@mail.gmail.com>
References: <7ac1e90c0608210727m1c5375b9xb936168c877084c@mail.gmail.com>
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Date: Mon, 21 Aug 2006 17:24:52 +0100
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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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