Messages in this thread | | | Date | Sat, 13 Nov 2004 20:36:59 -0800 | From | "Randy.Dunlap" <> | Subject | Re: RTC Chip and IRQ8 on 2.6.9 |
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linux-os wrote: > > I must use the RTC and IRQ8 in a driver being ported from > 2.4.20 to 2.6.9. When I attempt request_irq(8,...), it > returns -EBUSY. I have disabled everything in .config > that has "RTC" in it. > > The RTC interrupt is used to precisely time the sequencing > of a precision A/D converter. It is mandatory that I use > it because the precise interval is essential for its > IIR filter that produces 20 bits of resolution from a > 16 bit A/D. > > CPU0 > 0: 60563767 IO-APIC-edge timer > 1: 57096 IO-APIC-edge i8042 > 8: 1 IO-APIC-edge rtc > 9: 0 IO-APIC-level acpi > 12: 66 IO-APIC-edge i8042 > 14: 112322 IO-APIC-edge ide0 > 16: 0 IO-APIC-level uhci_hcd, uhci_hcd > 18: 640 IO-APIC-level libata, uhci_hcd, Analogic Corp DLB > 19: 0 IO-APIC-level uhci_hcd > 20: 4894484 IO-APIC-level eth0 > 21: 110543 IO-APIC-level aic7xxx > 23: 0 IO-APIC-level ehci_hcd > NMI: 0 LOC: 60565403 ERR: 0 > MIS: 0 > > This stuff works fine in 2.4.22 and, in fact, I'm the guy > that added the global rtc_lock so that this very driver > could run without interfering with anybody. Now, some code, > somewhere (not in a module), has allocated the interrupt > and generated exactly 1 interrupt. The kernel won't let > me use that interrupt! > > How do I undo this so I can use my hardware on my machine?
I happen to be running a 2.6.9-rc1 kernel right now, with an IO APIC (P4 UP), and no RTC support built into it, and /proc/interrupts show IRQ 8 empty/unassigned:
CPU0 0: 777037582 IO-APIC-edge timer 1: 185323 IO-APIC-edge i8042 7: 0 IO-APIC-edge parport0 9: 0 IO-APIC-level acpi 12: 2838473 IO-APIC-edge i8042 14: 1197859 IO-APIC-edge ide0 15: 42 IO-APIC-edge ide1 17: 49 IO-APIC-level aic7xxx, ohci_hcd 19: 0 IO-APIC-level uhci_hcd 21: 197 IO-APIC-level ohci1394, ohci_hcd, ohci_hcd, ohci_hcd, ohci_hc d, ohci_hcd 22: 832350 IO-APIC-level ehci_hcd, eth0 23: 16387 IO-APIC-level es1371, uhci_hcd NMI: 0 LOC: 776994543 ERR: 0 MIS: 0
Perhaps your .config and a simple test case would help.
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