[U-Boot] Interrupt handlers in u-boot

[prathika <prathika@deeopl.com>]

i am using PPC 440 EP. i used mtdcr definitions available in uboot. i 
understand the UIC dcr registers are directly accessable.
I have configured IRQ0 as interrupt by writing to the following registers=>
GPIO1_TCR[8]=0
GPIO1_TSRL[16:17]=00
GPIO1_ISR1L[16:17]=01

And when thought it could a hardware issue on my board as the IRQ0 is 
connected to the CPLD, i tried configuring IRQ1. the state of IRQ1 is low.
when i enable UIC0_ER register for IRQ1, there is no interrupt 
generated.but when i enable UIC0_PR for IRQ1 to be detected in positive 
polarity, an interrupt is generated with a bogus interrupt message. Did 
i understand the UIC0_PR register functionality wrong?

Thank & Regards,
Prathika R


Stefan Roese wrote:
> On Thursday 09 April 2009, prathika wrote:
>> i got the interrupt handler working for SPI Receive in PPC 440 using
>> install_hdlr().
>> Now i am trying to enable the External IRQ0 in my stand alone
>> application. I am trying to detect the positive of the interrupt pulse,
>> so i wrote corresponding bit to the UIC0_PR  and UIC0_EN register and
>> also calling the install_hdlr().
>> but still it detects the zero state at the IRQ0 pin and always executes
>> the interrupt handler.
>> when i read back the DCRs UIC0 enable and polarity registers using my
>> application, the control word is fine.
>> but when i read using uboot commands getdcr in command window, the
>> status of both enable and polarity registers are not enabled for IRQ0.
>> when i try to set the corresponding bit for IRQ0 using setdcr, it gives
>> me message, "Masking bogus interrupt for 0x17"
>> where am i going wrong.Some one please help.
>> Thanks in advance.
> 
> So which PPC440 variant are you using? And how did you configure the UIC 
> registers exactly? And is IRQ0 perhaps multiplexed with another multifunction 
> pin (see GPIO chapter)?
> 
> Best regards,
> Stefan
> 
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