linux-kernel - RE: [PATCH 1/2] misc: add CARMA DATA-FPGA Access Driver

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Message-ID: <AE90C24D6B3A694183C094C60CF0A2F6D8AC45@saturn3.aculab.com>
Date:	Wed, 9 Feb 2011 16:30:23 -0000
From:	"David Laight" <David.Laight@...LAB.COM>
To:	"Ira W. Snyder" <iws@...o.caltech.edu>,
	<linuxppc-dev@...ts.ozlabs.org>
Cc:	<linux-kernel@...r.kernel.org>
Subject: RE: [PATCH 1/2] misc: add CARMA DATA-FPGA Access Driver

 
> This driver allows userspace to access the data processing 
> FPGAs on the OVRO CARMA board. It has two modes of operation:
> 
> 1) random access
> 
> This allows users to poke any DATA-FPGA registers by using mmap to map
> the address region directly into their memory map.

I needed something similar, but used pread() and pwrite()
to request the transfers.
While this does require a system call per transfer, it allows
the driver to use dma (if available) to speed up the request.
In my case doing single cycle transfers would be too slow.

	David


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