Re: [Xenomai-core] Xenomai on PXA

[Bart Jonkers <jonkersbart@domain.hid>]

On Wed, 2006-08-02 at 15:09 +0200, Gilles Chanteperdrix wrote:
> Detlef Vollmann wrote:
>  > > I also added an interrupt handler on a button which is connected to GPIO
>  > > pin. The interrupt handler should print something when it is executed.
>  > > When I push the button a couple of times nothing happens. So GPIO
>  > > interrupts doesn't seems to work.
>  > Probably GPIO0 and GPIO1 work.
>  > I suspect it's the cascading interrupt that doesn't work.
>  > When I played around with an earlier version of ipipe, I found that
>  > the IRQ_GPIO_2_80 (IRQ 10 on PXA270) is masked, but never unmasked
>  > again.
>  > 
>  > The problem is that for the cascading interrupt you need a special
>  > IPIPE handler, and I don't think there is currently one for PXA.
>  > 
>  > How is that done on other machines/architectures?
> 
> When looking at the ipipe_enable_pipeline function, we see that
> interrupts management routines are all intercepted by the I-pipe, so the
> cascaded interrupts management routines should be automatically
> intercepted. 
> 
> In order to have a better understanding of the issue, it would be
> interesting if you could trace the functions that are called on the path
> from the interrupt to the execution of the final handler.

I have tracked and solved the issue. I have looked to the i.MX21 port
and they added some code to the GPIO interrupt handler of the i.MX21.
When IPIPE is active they unmask the interrupt for the GPIO pins at the
end of the handler. I did the same for PXA and my GPIO interrupt problem
is solved. I think that the same is needed for SA-1100.
> 
> Re-reading the patch I sent, I also realised that an important part of
> the work is missing: the function gettimeoffset should be changed by the
> patch too. I would be surprised if your problem was related to this,
> though.
What need to be changed in the function gettimeoffset?

Bart
>