Date: Wed, 27 Nov 2002 10:03:23 -0700 (MST) From: "M. Warner Losh" <imp@bsdimp.com> To: dirkx@webweaving.org Cc: freebsd-hackers@FreeBSD.ORG Subject: Re: Understanding PCI intr routing on a Cirrus Logic PD6729 Message-ID: <20021127.100323.111035160.imp@bsdimp.com> In-Reply-To: <20021127111749.V2484-100000@foem.leiden.webweaving.org> References: <20021127111749.V2484-100000@foem.leiden.webweaving.org>
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In message: <20021127111749.V2484-100000@foem.leiden.webweaving.org>
Dirk-Willem van Gulik <dirkx@webweaving.org> writes:
: I've got a "Compaq" "WL200_11Mbps_Wireless_PCI_Card" here. This is a PCI
: card with a CL-PD6729 pci<->pcmcia bridge on it.
You poor bastard. The 6729 is a many magical and wonderful beast
that's different in subtle and not so subtle ways from all other
parts.
: The trouble is either a hang on detection (when pd6729_intr_path=2 is
: used) or a Timeout (with pd6729_intr_path=1/default) when trying to use
: this card with either 4.6 or -CURRENT.
-current has a better chance of working, but it is still busted. You
definitely want pd6729_intr_path=2. In my testing I've almost gotten
this card to work, but never completely. :-(
: Now it seems that all 4 PCI interrupt pins #A to #D of the PD6729 as well
: as IRQ9-12 are all wired together and all are routed to the same INT#A pin
: on the PCI bus.
:
: The INT#B, C and D pints of the PCI bus are not connected to anything.
:
: Now what exactly does this mean ?
:
: Should all PCI cards and their PCMCIA children all share the same IRQ and
: use polling only ?
Yes and no.
: How is that configured ? As I am guessing that any of
: the IRQ setup by /sys/pccard/pcic_pci.c is rather ignored by having the
: wiring on the physical card all going to #A ?
In theory, you'd set the pd6729_intr_path to 2. However, there's
still some stubtle bug that precludes this wfrom working.
Well, right now the following code is trying to force INTA#:
/*
* Ohterwise we're doing PCI interrupts. For those cardbus bridges
* that follow yenta (and the one pcmcia bridge that does), we don't
* do a thing to get the IRQ mapped into the system. However,
* for other controllers that are PCI, but not yetna compliant, we
* need to do some special mapping.
*
* XXX Maybe we shouldn't assume INTA#, but rather as the function
* XXX what Intline to use.
*/
if (sp->controller == PCIC_PD6729) {
/*
* INTA - 3
* INTB - 4
* INTC - 5
* INTD - 7
*/
sp->putb(sp, PCIC_INT_GEN, /* Assume INTA# */
(sp->getb(sp, PCIC_INT_GEN) & 0xF0) | 3);
return (0);
}
This doesn't force the interrupt to be IRQ3, but rather tells the card
to use INTA#. The probe line for wi card should say irq N where N is
the same as the bridge's irq.
I don't suppose you could enable a serial console and use that to get
me a dmesg? I'll help you debug this, but am a little busy with 5.0
issues right now to take another swing at it.
Warner
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