Date: Tue, 9 May 2000 20:15:36 +0100 (BST) From: Doug Rabson <dfr@nlsystems.com> To: "John H. Baldwin" <jobaldwi@cslab.vt.edu> Cc: freebsd-new-bus@freebsd.org, jhb@freebsd.org, n_hibma@freebsd.org Subject: Re: Alpha USB difficulties... Message-ID: <Pine.BSF.4.21.0005092012110.47945-100000@salmon.nlsystems.com> In-Reply-To: <Pine.BSF.4.21.0005090836050.31869-100000@snowcow.cslab.vt.edu>
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On Tue, 9 May 2000, John H. Baldwin wrote: > On Tue, 9 May 2000, Doug Rabson wrote: > > > There is already a function isa_alloc_intr() which does most of what you > > need so perhaps you don't need to add isa_alloc_intrs(). On the other > > hand, your function is slightly more general. > > I did see the isa_alloc_intr() function, it was what I modeled my function > on. I did use the intrs() function solely for the general case. I > figured it would be bad to assume that all IRQ requests would always > contain just one IRQ. If that is the case, however, then I'll change it > to use isa_alloc_intr() instead. > > > To make interrupt delivery work, you also need to hook pci_setup_intr and > > pci_teardown_intr and vector them to the isa functions too. > > Hmmm, it looks like I'll need to override this /sys/pci/pcisupport.c > conditional on #ifdef alpha? Or is this only a USB thing and thus should > only be done for the ohci and uhci drivers? I was assuming that this was > a general problem with SRM and PCI devices with ISA IRQ's. Hmm. I forgot that each chipset provides its own setup/teardown code. You don't need to change any mi code but you probably need to add some extra logic to cia_setup_intr() and tsunami_setup_intr(). Those are the main chipsets which are affected although really this should happen for all chipsets which don't use the ISA pic for routing all interrupts. -- Doug Rabson Mail: dfr@nlsystems.com Nonlinear Systems Ltd. Phone: +44 20 8442 9037 To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-new-bus" in the body of the message
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