On Mon, Nov 21, 2011 at 05:53:30PM +0100, Guillaume Knispel wrote: > On Mon, 21 Nov 2011 17:01:29 +0100 > Andre Haupt <andre@xxxxxxxxxxxxxxx> wrote: > > > 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? > > The LPC is typically automatically mapped by the hardware (southbridge) > for some fixed ranges, various configurable ranges and might also use > PCI substractive decoding. > > LPC is indeed an ISA bus with the physical layer replaced by something > with fewer signals, but from the point of view of the software there is > almost no difference, so look for how to program ISA drivers and you > will probably have your answer. So request_mem_region(), ioremap(), ioread*() and iowrite*() are my friends here right? Still unsure how to obtain the LPC base address. Is this mapped to 0xA0000-0xFFFFF as with ISA? cheers, Andre _______________________________________________ Kernelnewbies mailing list Kernelnewbies@xxxxxxxxxxxxxxxxx http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
