Re: [Xenomai-help] Virtual IRQ Numbers in powerpc?

["A. Nolson" <alohanono@domain.hid>]

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.
>   
>> 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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