From: "Uwe Kleine-König" <Uwe.Kleine-Koenig@digi.com>
To: Magnus Damm <magnus.damm@gmail.com>
Cc: Paul Mundt <lethal@linux-sh.org>,
"Hans J. Koch" <hjk@linutronix.de>,
linux-kernel@vger.kernel.org, gregkh@suse.de,
linux-sh@vger.kernel.org, Katsuya MATSUBARA <matsu@igel.co.jp>
Subject: Re: [PATCH 00/03][RFC] Reusable UIO Platform Driver
Date: Wed, 21 May 2008 08:50:33 +0000 [thread overview]
Message-ID: <20080521085033.GA29607@digi.com> (raw)
In-Reply-To: <aec7e5c30805210122w5bdb8443r69bb7776e085276b@mail.gmail.com>
Hello,
Magnus Damm wrote:
> On Wed, May 21, 2008 at 5:05 PM, Uwe Kleine-König
> <Uwe.Kleine-Koenig@digi.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!
Yes it does. I thought the physical address is stored in internal_addr
and the virtual in addr, but it's the other way round. Thanks.
Best regards
Uwe
--
Uwe Kleine-König, Software Engineer
Digi International GmbH Branch Breisach, Küferstrasse 8, 79206 Breisach, Germany
Tax: 315/5781/0242 / VAT: DE153662976 / Reg. Amtsgericht Dortmund HRB 13962
WARNING: multiple messages have this Message-ID (diff)
From: "Uwe Kleine-König" <Uwe.Kleine-Koenig@digi.com>
To: Magnus Damm <magnus.damm@gmail.com>
Cc: Paul Mundt <lethal@linux-sh.org>,
"Hans J. Koch" <hjk@linutronix.de>,
<linux-kernel@vger.kernel.org>, <gregkh@suse.de>,
<linux-sh@vger.kernel.org>, Katsuya MATSUBARA <matsu@igel.co.jp>
Subject: Re: [PATCH 00/03][RFC] Reusable UIO Platform Driver
Date: Wed, 21 May 2008 10:50:33 +0200 [thread overview]
Message-ID: <20080521085033.GA29607@digi.com> (raw)
In-Reply-To: <aec7e5c30805210122w5bdb8443r69bb7776e085276b@mail.gmail.com>
Hello,
Magnus Damm wrote:
> On Wed, May 21, 2008 at 5:05 PM, Uwe Kleine-König
> <Uwe.Kleine-Koenig@digi.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!
Yes it does. I thought the physical address is stored in internal_addr
and the virtual in addr, but it's the other way round. Thanks.
Best regards
Uwe
--
Uwe Kleine-König, Software Engineer
Digi International GmbH Branch Breisach, Küferstrasse 8, 79206 Breisach, Germany
Tax: 315/5781/0242 / VAT: DE153662976 / Reg. Amtsgericht Dortmund HRB 13962
next prev parent reply other threads:[~2008-05-21 8:50 UTC|newest]
Thread overview: 42+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-05-20 10:51 [PATCH 00/03][RFC] Reusable UIO Platform Driver Magnus Damm
2008-05-20 10:51 ` Magnus Damm
2008-05-20 10:51 ` [PATCH 01/03] uio: Add enable_irq() callback Magnus Damm
2008-05-20 10:51 ` Magnus Damm
2008-05-21 11:58 ` Magnus Damm
2008-05-21 11:58 ` Magnus Damm
2008-05-22 20:18 ` Hans J. Koch
2008-05-22 20:18 ` Hans J. Koch
2008-05-23 1:24 ` Magnus Damm
2008-05-23 1:24 ` Magnus Damm
2008-05-23 8:43 ` Hans J. Koch
2008-05-23 8:43 ` Hans J. Koch
2008-05-20 10:51 ` [PATCH 02/03] uio: Add uio_platform driver Magnus Damm
2008-05-20 10:51 ` Magnus Damm
2008-05-20 10:51 ` [PATCH 03/03] sh: Export sh7343/sh7722/sh7723 VPU/VEU blocks Magnus Damm
2008-05-20 10:51 ` Magnus Damm
2008-05-20 21:07 ` [PATCH 00/03][RFC] Reusable UIO Platform Driver Hans J. Koch
2008-05-20 21:07 ` Hans J. Koch
2008-05-21 3:31 ` Magnus Damm
2008-05-21 3:31 ` Magnus Damm
2008-05-21 6:49 ` Uwe Kleine-König
2008-05-21 6:49 ` Uwe Kleine-König
2008-05-21 7:49 ` Paul Mundt
2008-05-21 7:49 ` Paul Mundt
2008-05-21 8:05 ` Uwe Kleine-König
2008-05-21 8:05 ` Uwe Kleine-König
2008-05-21 8:22 ` Magnus Damm
2008-05-21 8:22 ` Magnus Damm
2008-05-21 8:50 ` Uwe Kleine-König [this message]
2008-05-21 8:50 ` Uwe Kleine-König
2008-05-21 8:09 ` Magnus Damm
2008-05-21 8:09 ` Magnus Damm
2008-05-21 9:25 ` Uwe Kleine-König
2008-05-21 9:25 ` Uwe Kleine-König
2008-05-21 10:50 ` Magnus Damm
2008-05-21 10:50 ` Magnus Damm
2008-05-21 11:04 ` Uwe Kleine-König
2008-05-21 11:04 ` Uwe Kleine-König
2008-05-21 11:56 ` Magnus Damm
2008-05-21 11:56 ` Magnus Damm
2008-05-21 12:09 ` Uwe Kleine-König
2008-05-21 12:09 ` Uwe Kleine-König
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