MFRC522 RFID device

[shug]

Hello,
I'm trying to deal with the MFRC522 card on my olinuxino A20.
It works like a charm on arduino and raspberry but I don't know where to start on A20.
First I event don't know which pin on the GPIO I have to plug.
Then I try to enable SPI but I don't know how : on raspberry there is a library called RPI.GPIO.
Any help ? Please

Thanks
xavier