a question of mpc8313, maybe simple

[jumpingProgrammer]

i am working with a board of mpc8313 using default mpc8313erdb.dts.
But i do not know how can i correctly use DMA to transport data from memory
to a PCI device.
i tryed this
{
     .....
     request_irq(IRQ,....);
     request_dma(.....);
     ....
}

In request_irq() , i do not know what is the parameter IRQ.
And , i did not find any words about DMA in mpc8313erdb.dts .
So 
1. please tell me what should be the parameter IRQ?
      Is it the irq requested when DMA initialized or another one?
2. If i want initialize DMA, how should i do with mpc8313erdb.dts?


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