Messages in this thread |  | | | Date | Tue, 31 May 2011 21:54:26 +0200 | | Subject | Re: m68k: Convert to genirq (WIP) | | From | Geert Uytterhoeven <> |
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Hi Thomas,
On Sat, May 28, 2011 at 20:32, Geert Uytterhoeven <geert@linux-m68k.org> wrote: > Next on my list is Amiga, which will cover autovectored and chained interrupts.
Plain chained interrupts should be handled by calling irq_set_chained_handler() to register an irq_flow_handler_t, and let the handler call generic_handle_irq() for each successive interrupt, right?
However, on Amiga we have interrupts (IRQ_AMIGA_PORTS and IRQ_AMIGA_EXTER) that are a combination of chained (for the CIA interrupt controllers) and shared level interrupts (for motherboard hardware and Zorro expansion boards). But irq_set_chained_handler() sets IRQ_NOREQUEST, i.e. the interrupt cannot be requested anymore via request_irq(), so this rules out using it with shared level interrupts.
What's the preferred way to handle this? Is there are standard way, or should I write my own specialized irq_flow_handler_t that handles both?
In the old scheme, we just registered the chain handlers with request_irq(), so they worked nicely together with the shared level interrupts (cfr. arch/m68k/amiga/cia.c)
Thanks!
Gr{oetje,eeting}s, Geert
-- Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org
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