linux-kernel - Re: FPGA programming driver architecture

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Message-ID: <82ecf08e0901081414u15af3c2dy9c88a242db024dc7@mail.gmail.com>
Date:	Thu, 8 Jan 2009 20:14:36 -0200
From:	"Thiago Galesi" <thiagogalesi@...il.com>
To:	"Hugo Villeneuve" <hugo@...ovil.com>
Cc:	"Florian Fainelli" <florian@...nwrt.org>,
	linux-kernel@...r.kernel.org, linux-embedded@...r.kernel.org
Subject: Re: FPGA programming driver architecture

> > > Hi,
> > > I have written some code to program a FPGA in Linux, for two
> > > different types of boards: one uses a serial interface (SPI) and
> > > the second a parallel interface. I have been able to sucessfully
> > > program both boards. I'm now trying to clean my code and make it
> > > more generic, as well as better in line with the Linux driver
> > > model.

Considering the several FPGA models available and ways to program it,
I guess the important thing to consider is what can be made generic.
(that is what will become fpgaload)

Also, there may be cases where after FPGA is programmed it "becomes a
device" (PCI or whatever)

> >
> > - fpgaload-core which contains all the code that can be shared
> > between the drivers like requesting firmware, providing sysfs
> > attributes,
> > - fpgaload-spi would handle the low-level SPI connection
> > - fpgaload-par would handle the low-level parallel connection

I think this maybe split into three layers (maybe)

1 - low level connection: paralell / spi / i2c / whatever
2 - vendor: xylinx, altera, etc
3 - generic stuff

Take a look at the MTD and SPI drivers and how they split things

--
-
Thiago Galesi
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