From: Alan Cox <alan@lxorguk.ukuu.org.uk>
To: Bahadir Balban <bahadir.balban@gmail.com>
Cc: linux-kernel@vger.kernel.org
Subject: Re: disabling dma/new ide interface 2.6.18-rc4-mm1
Date: Mon, 21 Aug 2006 17:24:52 +0100 [thread overview]
Message-ID: <1156177492.18887.44.camel@localhost.localdomain> (raw)
In-Reply-To: <7ac1e90c0608210727m1c5375b9xb936168c877084c@mail.gmail.com>
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
prev parent reply other threads:[~2006-08-21 16:03 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-08-21 14:27 Bahadir Balban
2006-08-21 16:24 ` Alan Cox [this message]
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