[linuxsh-dev] Re: !!! QUESTION !!! --- Hamletic question ---

[Fabio G. <fg...@ti...>]

Thanks, yesterday I was thinking about end I reached the same result about to 
implement the demux mechanism.

Thanks again

On Wednesday 10 April 2002 20:19, Stuart Menefy wrote:
> Several of your options dropped off the end of the email I got here, but
> if I understand you correctly, you have exactly the same problem as people
> using companion chips such as the HD64465.
>
> Have a look for the macro irq_demux. This is defined differently for
> different systems, but in all cases it is used to demux a single interrupt
> comming into the CPU into a number of 'soft' interrupts, based on an
> external status register. These soft interrupts appear as interrupt
> numbers immediatly above the normal interrupts, so you'll also need to
> change the defintion of OFFCHIP_NR_IRQS, and register your device
> drivers to respond to these soft interrupt numbers.
>
> Stuart
>
>
>
> On Wed, 10 Apr 2002 10:25:33 +0200
>
> fg...@ti... wrote:
> > Hi, Sirs
> >
> > This is my hamletic question.
> >
> > My board has a companion chip (CC) with its own interrupt enabel
> > registers and its own interrutp status register. When someting wired to
> > my CC generates an interupt request the CC generate an interrupt on IQR0
> > on my sh7709a. So I have to handle the IQR0 request choosing the rigth
> > handler according to the exact source (keyboad, mouse, timer etc).
> > In linux Sh if I understand good there are two ways to solve this
> > problem: 1) using the IRQ0 handler writing an
> > static struct irqaction irq0  = { CC_interrupt, SA_INTERRUPT, 0, "CC",
> > NULL, NULL};