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.
>
> 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
>
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--
Philippe.
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