On Mon, 03 Jan 2005 21:44:33 +0000, Alan Cox <alan@lxorguk.ukuu.org.uk> wrote:
>
> Different PCI functions are but nothing requires that the PCI function
> that is the IDE controller is only the IDE controller. In some cases
> other logic lives in the "spare" BAR register areas of the device.
>
> One example where the weird design makes it obvious is the CS5520. Here
> the 5520 bridge has the IDE in one BAR and all sorts of other logic
> (including the xBUS virtual ISA environment) in the same PCI function.
> On that chip a pci_disable_device on the IDE pci_dev turns off mundane
> things like the timer chips keyboard and mouse 8).
>
> Other vendors do equally evil things and providing the chip reports IDE
> class and has the IDE BARs set up nobody else is any the wiser and
> presumably gate count goes down.
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>