linux-kernel - Re: [PATCH 00/03][RFC] Reusable UIO Platform Driver

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Date:	Wed, 21 May 2008 17:22:32 +0900
From:	"Magnus Damm" <magnus.damm@...il.com>
To:	"Uwe Kleine-König" <Uwe.Kleine-Koenig@...i.com>
Cc:	"Paul Mundt" <lethal@...ux-sh.org>,
	"Hans J. Koch" <hjk@...utronix.de>, linux-kernel@...r.kernel.org,
	gregkh@...e.de, linux-sh@...r.kernel.org,
	"Katsuya MATSUBARA" <matsu@...l.co.jp>
Subject: Re: [PATCH 00/03][RFC] Reusable UIO Platform Driver

On Wed, May 21, 2008 at 5:05 PM, Uwe Kleine-König
<Uwe.Kleine-Koenig@...i.com> wrote:
> @Magnus: Maybe you can provide the userspace part of the driver?
> How is that mapping used there?

[Added Matsubara-san as CC]

Sure, here is a little test program. Have a look at "uio_mem". The
"address" member contains the physical address that can be used for
bus mastering DMA. Compare that to "iomem" which is the pointer to the
virtual memory area in user space.

Hope this helps!

/ magnus

View attachment "veu_lab.c" of type "text/x-csrc" (7353 bytes)