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hi Malik,
when using request_irq(...),the parameter irq is a value specified by you, of course,when porting linux
for your board,you should have specified value
for every IRQ. 0--5 only means
CPU pin for interrupt,unless that only one interrupt
may occur on this pin,you
will use other value in request_irq,instead of
0-5.
all in all, when we touch
request_irq,it is board specific.When your board has
been made out,all interrupts
have specific route to cpu(unless you have IRQ
router,since embedded,need
this??).If you have more external interrupts than
cpu pins,maybe you have
cascaded many interrupt using one cpu pin.So,
the parameter irq in
request_irq is determined by your board and your porting
for interrupt handling.Just ask
that guy that ported linux.He will tell you.If you
are using linux ported by
others,have a look at BSP codes.
Regards,
Alan Liu
-----Original
Message-----
From: Adeel Malik [mailto:AdeelM@quartics.com] Sent: Tuesday, November 04, 2003 7:56 PM To: linux-mips@linux-mips.org Subject: How to request an IRQ for NMI on MIPS Processor Hi All,
In my
embedded design, I intend to use NMI of MIPS 4Kc processor (rather
than IRQ0 or IRQ1 .....) for an external Interrupt Source. The external
Interrupt source is a video capture device which interrupts the MIPS 4Kc CPU via
its NMI (Non-Maskable Interrupt) line, whenever it has one complete frame.
I need to write the driver for that device in Linux-2.4.20. The
request_irq function provided by Linux takes a
digit value from 0 to 5 to map external interrupt sources to any one of
CPUs Interrupt pins. How can I request and implement my interrupt handler
routine for the NMI of MIPS processor ?.
Regards,
ADEEL MALIK,
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