Interrupt GPIOs with MPC5200b

[Dave Best]

Hi, I am working on a MPC5200B-tiny with 2.6.23.1 Linux (pcm030).

I want to use an interrupt GPIO to act as the source for my ISR, but i can't find the IRQ numbers for the GPIOs so i can't call request_irq() to set my ISR up.  

For other platforms there seems to be the function gpio_to_irq() where enumerated GPIOs get an IRQ number for their request_irq calls.

Any help or hints appreciated.

Dave