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SubjectRe: RTC Chip and IRQ8 on 2.6.9
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.

--
~Randy
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