Charles Krinke wrote: >>Let me try a more simplified IRQ question a different way by only >>referring to the 8541. >>There are 12 external interrupt sources, irq[0..11] and as I understand
>>it, they all go through one vector, ExternalInput set in >>head_fsl_booke.S and this vector resolves to "do_IRQ()", which I believe >>is in arch/powerpc/kernel/irq.c (not arch/ppc/kernel/...). >>I am striving to understand how mapping of these external pins >>irq[0..11] gets to IRQ numbers as shown with "cat /proc/interrupts". > IIUC, the external IRQ #'s should follow those occupied by 32 > internal IRQs. > But those shown in that file are "virtual" numbers, i.e. they got > re-mapped by the kernel as it sees fit (basically, it tries to assign > the same # to IRQs above 15 and remaps those below) >>Could someone point me at some references I can read to understand this >>nuance of the 8541 in a linux-2.6.17.11 kernel, please. > I'm not sure arch/powerpc/ in 2.6.17 had the complete MPC8541 > support... > So would this mean that the external IRQ0 pin would map to irq #32 and > not irq #16 and the external IRQ11 pin would map to irq #43 and not irq Where from is that #16? > #27? So that if I want IRQ0, I would set my irq member of the pci_dev > struct to 32? Yeah, unless MPC8541 has some complications like CPM. And also note that I'm assuming 32 internal IRQs based on what MPC8540 has, not having MPC8541 specs... > Charles WBR, Sergei _______________________________________________ Linuxppc-embedded mailing list Linuxppc-embedded@ozlabs.org https://ozlabs.org/mailman/listinfo/linuxppc-embedded
