Re: Simple GPMC device driver with basic User application

[Tony Lindgren <tony@atomide.com>]

* James <angweiyang@gmail.com> [111023 18:13]:
> Dear all,
> 
> I'm learning embedded linux development and need help on my task.
> 
> I'm trying to communicate with a FPGA via the GPMC bus on my Overo FE
> board and need assistance with writing a simple device driver & test
> application that uses the GPMC bus to read & write a WORD size data
> and also a BLOCK of WORD data to the FPGA.
> 
> The FPGA-OMAP3530 will be use synchronous read/write over the 16-bit
> datapath and CS 6.
> The GPMC bus is shared with an Ethernet chip and NAND chip as per
> Gumstix COM + TOBI/Chestnut design and these standard devices must
> still work as per norm.
> 
> I've been searching via GMANE for similar questions but some are
> pointing to non-existence archives.
> 
> I believe I have to develop a kernel device driver to register the
> FPGA and from which will expose a device node for the test
> application.
> or is there a generic GPMC driver that does it?
> 
> Can someone share with me similar layout and code so that I can base
> my learning from a starting point?
> 
> Many thanks in adv.

Please take a look at the various arch/arm/mach-omap2/gpmc-*.c files.
The biggest pain is to get the timings right.

Tony