PCI IRQ routing change broke PCMCIA/prism54 driver
rmk+pcmcia at arm.linux.org.uk
Tue Aug 17 04:47:04 EDT 2004
On Tue, Aug 17, 2004 at 09:29:10AM +0100, David Woodhouse wrote:
> On Sat, 2004-08-14 at 22:31 +0100, Russell King wrote:
> > When in Cardbus mode, there is only one interrupt line for child
> > devices, and this will be forwarded upstream from the bridge using
> > the Cardbus bridge IRQ itself. Therefore, all child devices of a
> > Cardbus bridge will always have the same PCI IRQ as the Cardbus
> > bridge to which it is connected.
> Not always true. The TI PCI1420 can be configured to use two interrupt
> outputs, for example.
Please read the spec and what I wrote again. In the case of PCI1420
configured to use both parallel PCI IRQs (INTA and INTB) then socket
1 (which is function 0) uses INTA and socket 2 (which is function 1)
Therefore, all Cardbus devices connected to socket 1 use INTA and
all Cardbus devices connected to socket 2 use INTB.
So what I said _is_ true.
Linux kernel 2.6 ARM Linux - http://www.arm.linux.org.uk/
maintainer of: 2.6 PCMCIA - http://pcmcia.arm.linux.org.uk/
2.6 Serial core
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