Lorenzo Lutti wrote:
> Question number 1: why enabling IRQ49 isn't enough? A code like this
> doesn't work:
>
> DAVINCI_PINMUX0 &= ~(1<<26); // just in case
> if( request_irq( 49,my_irq_handler, SA_INTERRUPT, "test", NULL))
> {
> ...
> }
> set_irq_type( 49, IRQT_FALLING);
> enable_irq( 49);
> ...
>
> I've checked the registers, everything looks fine:
> -EINT1 bit 17 (IRQ49 enable) is set;
> -PINMUX bit 26 (CWEN) is cleared;
> -DIR01 bit 1 (GPIO1 direction) is set.
all good, just lose the enable_irq(), it's not necessary.
>
> But the ISR is never called. Why? request_irq() returns succesfully
> and the kernel doesn't complain (it just output the unbalanced irq
> message, which is harmless as far as I know).
In 2.6.10, you need to set up the GPIO interrupt bank yourself, i.e.
enabling and acknowledging the GPIO IRQ in the correct bank manually.
>
>
> Question number 2: why in the 2.6.19 kernel the IRQ numbers for GPIOs
> have been translated? For example, GPIO1 (which is IRQ49) in the new
> kernel becomes the interrupt number 65.
... the GPIO interrupt banks are treated as a chained interrupt
controller, hence the translation.
>
> Thank you!
>
> Cheers, Lorenzo
> _______________________________________________
> Davinci-linux-open-source mailing list
> Davinci-linux-open-source@linux.davincidsp.com
> http://linux.davincidsp.com/mailman/listinfo/davinci-linux-open-source
--
* Matthias Welwarsky
Project Manager Software
Germany
*
____________________________________________________________________________
This email and any files transmitted with it are confidential and are
intended solely for the use of the individual or entity to which they are
addressed. Access to this e-mail by anyone else is unauthorised. If you are
not the intended recipient, any disclosure, copying, distribution or any
action taken or omitted to be taken in reliance on it, is prohibited. E-mail
messages are not necessarily secure. Archos does not accept responsibility
for any changes made to this message after it was sent.
_______________________________________________
Davinci-linux-open-source mailing list
Davinci-linux-open-source@linux.davincidsp.com
http://linux.davincidsp.com/mailman/listinfo/davinci-linux-open-source
