Unable to capture device interrupts on ppc440gx?

Unable to capture device interrupts on ppc440gx?

[Sanjay Bajaj]

In the device driver open function, I call request_irq() to register my =
interrupt handler function to a specified IRQ number. It succeeds. But =
when I enable the interrupt (and we can detect the hardware line is =
active) on the hardware, the interrupt handler in NOT invoked. Is there =
something I am missing? Any help or pointers are appreciated.

Sanjay

Re: Unable to capture device interrupts on ppc440gx?

[Eugene Surovegin]

On Mon, Apr 18, 2005 at 12:02:52PM -0400, Sanjay Bajaj wrote:
> In the device driver open function, I call request_irq() to register 
> my interrupt handler function to a specified IRQ number. It 
> succeeds. 
> But when I enable the interrupt (and we can detect the hardware line 
> is active) on the hardware, the interrupt handler in NOT invoked. Is 
> there something I am missing? Any help or pointers are appreciated.

Did you configure polarity and triggering settings for this IRQ 
source? If not, look for example at ebony.c (ppc4xx_uic_ext_irq_cfg) 
keeping in mind, that Ebony has 440GP CPU. 440GX has 5 additional 
IRQ lines.

-- 
Eugene

RE: Unable to capture device interrupts on ppc440gx?

[Sanjay Bajaj]

Eugene,

That did help. I was using the Interrupt Line D, whereas hardware is =
generating interrupt on Interrupt Line A. Correcting the IRQ number to =
the one specified in the arch/platforms file captured the interrupt in =
the device driver.

Thanks for the help.
Have a nice day.
Sanjay

-----Original Message-----
From: Eugene Surovegin [mailto:ebs@ebshome.net]
Sent: Monday, April 18, 2005 12:14 PM
To: Sanjay Bajaj
Cc: linuxppc-embedded@ozlabs.org
Subject: Re: Unable to capture device interrupts on ppc440gx?


On Mon, Apr 18, 2005 at 12:02:52PM -0400, Sanjay Bajaj wrote:
> In the device driver open function, I call request_irq() to register=20
> my interrupt handler function to a specified IRQ number. It=20
> succeeds.=20
> But when I enable the interrupt (and we can detect the hardware line=20
> is active) on the hardware, the interrupt handler in NOT invoked. Is=20
> there something I am missing? Any help or pointers are appreciated.

Did you configure polarity and triggering settings for this IRQ=20
source? If not, look for example at ebony.c (ppc4xx_uic_ext_irq_cfg)=20
keeping in mind, that Ebony has 440GP CPU. 440GX has 5 additional=20
IRQ lines.

--=20
Eugene