Re: Questions about the interrupt controller

[Manuel Lauss <mano@roarinelk.homelinux.net>]

Francis Moreau wrote:
> Hello Manuel,
> 
> On Fri, Feb 29, 2008 at 4:32 PM, Manuel Lauss
> <mano@roarinelk.homelinux.net> wrote:
>>  Again, I can only tell for my SH7760 platform. You need to register your
>>  own irq_chip with mask/unmask/mask_ack callbacks. On the SH7760, the
>>  IRLs trigger as vectors 0-15, and one has to provide external logic to
>>  do the irq masking/acking. SH7780 and newer IIRC provide an INTC
>>  register for that.
>>
>>  This is code I use:
>>
> 
> [snip]
> 
> But couldn't you use make_imask_irq() instead ?

Yes, that works too; at least for the IRL irqs if the source does not
have to be acked (CF cards).


>>  > The documentation says: "Other compatible interrupt controllers can be
>>  > cascaded with INTC.". Where can I find some details about that ?
>>
>>  have a look at set_irq_chained_handler() function, for example:
>>
> 
> [snip]
> 
> Actually I'm wondering what does 'compatible' mean.... ?

4 lines which are pulled low to signal IRQ condition and the ~bitmask of 
those 4 lines indicates the number of the irq to trigger?
Thats my understanding of how it works...

-- 
  ml.