On Sat, 2009-10-24 at 20:42 +0200, A. Nolson wrote:
> Philippe Gerum wrote:
> > On Sat, 2009-10-24 at 19:05 +0200, A. Nolson wrote:
> >
> >> Hi,
> >>
> >> i have a PowerPC 405 based system using a 2.6.30 Xenomai patched kernel
> >> and I want to manage some interrupts in userspace for some non-critical
> >> custom drivers. I have an OF device-tree where I indicate my HW
> >> interrupts (the ones I need to use are not shared with any already
> >> managed interrupt in the kernel). I have been trying to initialize an
> >> interrupt handler in userspace with rt_intr_create by using the real
> >> interrupt numbers indicated in the dts . The handler gets loaded but no
> >> interrupt shows up. I have seen that rt_intr_create indicates that the
> >> irq number is "architecture dependant", but I haven't been able to spot
> >> further explanations on this. I know that arch=powerpc use virtual
> >> interrupts and I am wondering if I first need to map the real interrupt
> >> in a virtual interrupt number before using it( like one would do in a
> >> normal linux kernel driver ).
> >>
> >
> > Yes, Xenomai/ppc uses virtual interrupt mappings (which are NOT related
> > at all with virtual I-pipe interrupts though). You should always use the
> > same IRQ numbers as the vanilla kernel exposes to its drivers, this is a
> > rule of thumb with all archs Xenomai supports.
> >
> > To sum up, you should replace the real (OF) hw IRQ number in the call to
> > rt_intr_create() by its remapped counterpart.
> >
> Thanks a lot for the info Phillippe. Now the question(maybe obvious)
> would be, how do I remap the interrupts outside the kernel? I remember
> doing this in a kernel driver, but never in userspace that is where I
> need to develop now with Xenomai.
You will still need a piece of kernel code to do that; Xenomai does not
provide any userland interface for this purpose.
Maybe you could just declare your custom devices in your dts file, with
the appropriate "interrupts" properties, so that they get virtualized
during the prom parsing stage, then mapped to the UIC they belong to?
> >
> >> I am doing this:
> >>
> >> if( (err = rt_intr_create(&(dev->intr_desc), "GPIO IRQ", irqno,
> >> I_NOAUTOENA)) < 0 ){
> >> pdbg(DBG_WARN, "Cannot create interrupt for GPIO
> >> rt_intr_create=%i\n", err);
> >> return err;
> >> }
> >>
> >> rt_intr_enable (&(dev->intr_desc));
> >>
> >> if( (err = rt_task_spawn(&(dev->interrupt_task), "Int", 0, irq_prio,
> >> 0,fisr, (void*)&(dev->intr_desc))) < 0){
> >> pdbg(DBG_WARN, "Cannot Spawn ISR for GPIO. err = %d\n", err);
> >> return err;
> >> }
> >>
> >> What am I missing?
> >>
> >> Thanks!
> >>
> >> /Alfred
> >>
> >> _______________________________________________
> >> Xenomai-help mailing list
> >> [email protected]
> >> https://mail.gna.org/listinfo/xenomai-help
> >>
>
--
Philippe.
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