From mboxrd@z Thu Jan  1 00:00:00 1970
From: Philippe Gerum <rpm@xenomai.org>
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Date: Sun, 25 Oct 2009 00:13:45 +0200
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Subject: Re: [Xenomai-help] Virtual IRQ Numbers in powerpc?
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To: "A. Nolson" <alohanono@domain.hid>
Cc: xenomai@xenomai.org

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

Btw,

adeos-ipipe-2.6.30-powerpc-DENX-2.7-00:   fine
adeos-ipipe-2.6.30.3-powerpc-DENX-2.7-01: BROKEN
adeos-ipipe-2.6.30.3-powerpc-DENX-2.7-02: fine

> 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 ).
> 
> 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.