fpga driver using PCI linux driver

HI all ,

Can anyone provide me pointers to write a fpga driver using PCI linux driver.
It is memory mapped and m thinking of using proc/bus/pci/devices file to get baseaddress and then use mmap to read and write on pci memory.
I thinkin by mmap only i can access pci memory space to do read and write on it.
Is this the right approach to go on ??

Thanks