Hi, Charles, Maybe you can try my patches about showing irq-mapping relationship.
http://patchwork.ozlabs.org/linuxppc/patch?id=9999 http://patchwork.ozlabs.org/linuxppc/patch?id=9997 http://patchwork.ozlabs.org/linuxppc/patch?id=9998 http://patchwork.ozlabs.org/linuxppc/patch?id=9996 Hope it could help you. Best Regards, Zhang Wei > Subject: RE: How do external irq's get mapped? > > > 3. The offset between TSEC1_tx of 13-->93 is a constant of > 80 decimal. > > Is this a clue to what the irq should be set to for external IRQ0 in > > this design? > > > Yeah. 112. However, you really should switch to using > arch/powerpc, > and device trees. In that instance, you set the irq to the pin > number (1-4), and the kernel will map that based on the > interrupt-map > property of the pci node. It was for precisely this type of problem > that the irq numbers were virtualized. The IRQ numbers in arch/ppc > actually change depending on whether you've *configured* the > CPM or not. > > Andy > > Dear Andy: > > I appreciate your kind advice, it does help converge understanding > somewhat. I can see how we get the 80 decimal offset with 64 + 32. > > I have commented out the call i8259_init(0,0) in > arch/ppc/platforms/85xx/mpc85xx_cds_common.c, but retained the call to > cpm2_init_IRQ(); shortly after that. We are constrained to finish the > current project with the kernel we started with, so changing > from ppc to > powerpc is really difficult right now. > > When the pci_dev->irq member is set to 112, there is a difference in > behavior. Now open_pic.c:720 is complaining that 112 is "invalid irq > 112", so some additional understanding is needed on my part. > > If you get a chance to help me continue to understand how the 8541 > interrupts are sutured into Linux, it would be greatly appreciated. > > Charles Krinke > _______________________________________________ > Linuxppc-embedded mailing list > Linuxppc-embedded@ozlabs.org > https://ozlabs.org/mailman/listinfo/linuxppc-embedded > _______________________________________________ Linuxppc-embedded mailing list Linuxppc-embedded@ozlabs.org https://ozlabs.org/mailman/listinfo/linuxppc-embedded
