From: Clemens Koller <clemens.koller@anagramm•de>
To: Clifford Wolf <clifford@clifford•at>
Cc: linuxppc-embedded@ozlabs•org
Subject: Re: Mem-2-Mem DMA - Generalized API
Date: Wed, 04 Jul 2007 12:11:28 +0200 [thread overview]
Message-ID: <468B7250.3070704@anagramm.de> (raw)
In-Reply-To: <20070704090554.GA30693@clifford.at>
Clifford Wolf schrieb:
> On Mon, Jun 25, 2007 at 08:01:10PM +0200, Clifford Wolf wrote:
>> I've put a 'draft header file' of an api as I would have expected it
>> online: [...]
>
> Ok, so here comes the first implementation:
> (I also have other projects, so it took a while.. ;-)
>
> http://www.clifford.at/priv/dmatransfer-20070704.diff
>
> This is just for the MPC8349 DMA now, registers are still hardcoded in the
> driver instead of beeing taken from the platform files and support for
> scatter-gather is still missing and the Kconfig integration isn't checking
> if we are building for the mpc8349 (or even ppc) yet. But I think the
> direction of the API is pretty clear.
That looks good. It should be useful on other PowerQUICC's DMA engines
and maybe even for the MPC5200 BestComm, too, with some changes.
> The patch also contains a hackish demo client (dma_demo_client.ko) which is
> performing some dma transfers in the 256th MB of physical memory. So it
> should only be used on a machine with 256MB of memory bootet with mem=255M
> (but changing that should be trivial). The demo client shows well how the
> API works and how much overhead the API adds.
>
> Any feedback this time?
Sorry, I'm currently busy with some hardware design work.
But if you want to test some code, I can get you an SSH account on my
MPC8540 platform.
Best regards,
--
Clemens Koller
__________________________________
R&D Imaging Devices
Anagramm GmbH
Rupert-Mayer-Straße 45/1
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D-81379 München
Tel.089-741518-50
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next prev parent reply other threads:[~2007-07-04 10:11 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-06-24 19:39 Mem-2-Mem DMA - Generalized API Clifford Wolf
2007-06-24 20:21 ` Arnd Bergmann
2007-06-25 8:03 ` Clifford Wolf
2007-06-25 11:03 ` Matt Sealey
2007-06-25 12:53 ` Clemens Koller
2007-06-25 14:31 ` Matt Sealey
2007-06-25 17:00 ` Olof Johansson
2007-06-25 17:48 ` Clifford Wolf
2007-06-25 18:01 ` Clifford Wolf
2007-06-25 21:20 ` Matt Sealey
2007-07-04 9:05 ` Clifford Wolf
2007-07-04 10:11 ` Clemens Koller [this message]
2007-07-07 5:24 ` Timur Tabi
2007-07-07 8:41 ` Clifford Wolf
2007-07-07 13:08 ` Arnd Bergmann
2007-07-07 13:27 ` Clifford Wolf
2007-07-07 13:28 ` Arnd Bergmann
2007-07-07 13:34 ` Clifford Wolf
2007-07-11 9:35 ` Clifford Wolf
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