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From: Sascha Hauer <s.hauer@pengutronix.de>
To: Linus Walleij <linus.ml.walleij@gmail.com>
Cc: "Marek Vasut" <marek.vasut@gmail.com>,
	linux-arm-kernel@lists.infradead.org,
	"Dan Williams" <dan.j.williams@intel.com>,
	linux-kernel@vger.kernel.org,
	"Uwe Kleine-König" <u.kleine-koenig@pengutronix.de>
Subject: Re: [PATCH 3/3 v2] dmaengine: Add Freescale i.MX SDMA support
Date: Mon, 30 Aug 2010 14:55:56 +0200	[thread overview]
Message-ID: <20100830125556.GL1473@pengutronix.de> (raw)
In-Reply-To: <AANLkTimhFAhR3sSJWo3b8_rMk5GCQfOwG0T36uEs=DjA@mail.gmail.com>

On Sun, Aug 29, 2010 at 02:35:01PM +0200, Linus Walleij wrote:
> 2010/8/28 Sascha Hauer <s.hauer@pengutronix.de>:
> 
> > Peripherals integrated into a SoC like the SDMA engine here are
> > normally accessible in native endianess and thus need the __raw_*
> > functions.
> 
> So the SDMA actually switch and twist around the endianness of
> its registers if it's synthesized into a bigendian version of the system?
> 
> Or hardware-dynamically even depending on the setting of the
> endianness bit in the ARM core?

I think it's the bus between the ARM core and the periherals which
changes the endianess. I have never tried running an i.MX in big endian
mode, so I can only guess how the system really behaves in BE mode.

Sascha

-- 
Pengutronix e.K.                           |                             |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |
Peiner Str. 6-8, 31137 Hildesheim, Germany | Phone: +49-5121-206917-0    |
Amtsgericht Hildesheim, HRA 2686           | Fax:   +49-5121-206917-5555 |

WARNING: multiple messages have this Message-ID (diff)
From: s.hauer@pengutronix.de (Sascha Hauer)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH 3/3 v2] dmaengine: Add Freescale i.MX SDMA support
Date: Mon, 30 Aug 2010 14:55:56 +0200	[thread overview]
Message-ID: <20100830125556.GL1473@pengutronix.de> (raw)
In-Reply-To: <AANLkTimhFAhR3sSJWo3b8_rMk5GCQfOwG0T36uEs=DjA@mail.gmail.com>

On Sun, Aug 29, 2010 at 02:35:01PM +0200, Linus Walleij wrote:
> 2010/8/28 Sascha Hauer <s.hauer@pengutronix.de>:
> 
> > Peripherals integrated into a SoC like the SDMA engine here are
> > normally accessible in native endianess and thus need the __raw_*
> > functions.
> 
> So the SDMA actually switch and twist around the endianness of
> its registers if it's synthesized into a bigendian version of the system?
> 
> Or hardware-dynamically even depending on the setting of the
> endianness bit in the ARM core?

I think it's the bus between the ARM core and the periherals which
changes the endianess. I have never tried running an i.MX in big endian
mode, so I can only guess how the system really behaves in BE mode.

Sascha

-- 
Pengutronix e.K.                           |                             |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |
Peiner Str. 6-8, 31137 Hildesheim, Germany | Phone: +49-5121-206917-0    |
Amtsgericht Hildesheim, HRA 2686           | Fax:   +49-5121-206917-5555 |

  reply	other threads:[~2010-08-30 12:56 UTC|newest]

Thread overview: 78+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2010-08-16 11:07 [RFC] dmaengine: assorted patches and Freescale SDMA support Sascha Hauer
2010-08-16 11:07 ` Sascha Hauer
2010-08-16 11:07 ` [PATCH 1/3] dmaengine: add possibility for cyclic transfers Sascha Hauer
2010-08-16 11:07   ` Sascha Hauer
2010-08-16 11:56   ` Lothar Waßmann
2010-08-16 11:56     ` Lothar Waßmann
2010-08-16 12:27     ` Linus Walleij
2010-08-16 12:27       ` Linus Walleij
2010-08-16 12:32     ` Sascha Hauer
2010-08-16 12:32       ` Sascha Hauer
2010-08-16 12:22   ` Linus Walleij
2010-08-16 12:22     ` Linus Walleij
2010-09-20 13:01   ` Sascha Hauer
2010-09-20 13:01     ` Sascha Hauer
2010-09-23 19:42     ` Dan Williams
2010-09-23 19:42       ` Dan Williams
2010-09-24  7:25       ` Sascha Hauer
2010-09-24  7:25         ` Sascha Hauer
2010-08-16 11:07 ` [PATCH 2/3] dmaengine: add wrapper functions for dmaengine Sascha Hauer
2010-08-16 11:07   ` Sascha Hauer
2010-08-23  7:17   ` Sascha Hauer
2010-08-23  7:17     ` Sascha Hauer
2010-09-20 13:02   ` Sascha Hauer
2010-09-23 19:53   ` Dan Williams
2010-09-23 19:53     ` Dan Williams
2010-09-24  7:25     ` Sascha Hauer
2010-09-24  7:25       ` Sascha Hauer
2010-09-24 15:45       ` Dan Williams
2010-09-24 15:45         ` Dan Williams
2010-08-16 11:07 ` [PATCH 3/3] dmaengine: Add Freescale i.MX SDMA support Sascha Hauer
2010-08-16 11:07   ` Sascha Hauer
2010-08-16 12:21   ` Linus Walleij
2010-08-16 12:21     ` Linus Walleij
2010-08-16 14:15     ` Sascha Hauer
2010-08-16 14:15       ` Sascha Hauer
2010-08-17  4:36       ` Baruch Siach
2010-08-17  4:36         ` Baruch Siach
2010-08-17  6:47         ` Sascha Hauer
2010-08-17  6:47           ` Sascha Hauer
2010-08-18  3:49           ` Alexei Babich
2010-08-18  4:41             ` Baruch Siach
2010-08-18 11:17           ` Philippe Rétornaz
2010-08-18 11:17             ` Philippe Rétornaz
2010-08-24  7:10     ` [PATCH 3/3 v3] " Sascha Hauer
2010-08-24  7:10       ` Sascha Hauer
2010-09-02 14:06     ` [PATCH 3/3] " Russell King - ARM Linux
2010-09-02 14:06       ` Russell King - ARM Linux
2010-08-23 12:57   ` [PATCH 3/3 v2] " Sascha Hauer
2010-08-23 12:57     ` Sascha Hauer
2010-08-23 17:30     ` Linus Walleij
2010-08-23 17:30       ` Linus Walleij
2010-08-24  6:58       ` Sascha Hauer
2010-08-24  6:58         ` Sascha Hauer
2010-08-23 17:48     ` Uwe Kleine-König
2010-08-23 17:48       ` Uwe Kleine-König
2010-08-28 15:18       ` Linus Walleij
2010-08-28 15:18         ` Linus Walleij
2010-08-28 15:27         ` Marek Vasut
2010-08-28 15:27           ` Marek Vasut
2010-08-28 16:18           ` Sascha Hauer
2010-08-28 16:18             ` Sascha Hauer
2010-08-28 16:30             ` Marek Vasut
2010-08-28 16:30               ` Marek Vasut
2010-08-28 17:20               ` Sascha Hauer
2010-08-28 17:20                 ` Sascha Hauer
2010-09-02 11:20               ` Russell King - ARM Linux
2010-09-02 11:20                 ` Russell King - ARM Linux
2010-08-29 12:35             ` Linus Walleij
2010-08-29 12:35               ` Linus Walleij
2010-08-30 12:55               ` Sascha Hauer [this message]
2010-08-30 12:55                 ` Sascha Hauer
2010-08-24  7:58     ` Lothar Waßmann
2010-08-24  7:58       ` Lothar Waßmann
2010-08-24 15:01       ` Linus Walleij
2010-08-24 15:01         ` Linus Walleij
2010-08-27 12:22   ` [PATCH 3/3 v3] " Sascha Hauer
2010-08-27 12:22     ` Sascha Hauer
2010-08-29 21:46     ` Marc Reilly

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