LPC bus access howto

Hi all, We have a FPGA which will be connected to the LPC bus. This FPGA will provide some GPIO functionality, a rotary encoder, etc. Now i want to write a kernel driver to talk to this FPGA. I am unsure how to get access to the LPC bus in the first place. What kernel APIs should i use? How to get the memory mapping right, etc? I would appreciate any pointers to documentation or examples. cheers, Andre