From: arnd@arndb.de (Arnd Bergmann)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH 01/10] ARM: change ARM_DMA_ZONE_SIZE into a variable
Date: Thu, 7 Jul 2011 18:17:11 +0200 [thread overview]
Message-ID: <201107071817.11842.arnd@arndb.de> (raw)
In-Reply-To: <alpine.LFD.2.00.1107062246130.14596@xanadu.home>
On Thursday 07 July 2011, Nicolas Pitre wrote:
> > What is hardware specific is that the DMA devices can only address a
> > limited range of memory. IMHO it's that which should be described in
> > DT, not that we'll have a DMA zone of X bytes in size.
>
> I think that we all agree on the principle. I certainly never intended
> to suggest that the DMA zone size be stored as is in the device tree.
There is a way to specify DMA address ranges in the device tree, though
I forgot the exact format. It comes down to saying the device sees
memory range XXX to YYY as its local address AAA to BBB. We could use
that information at boot time to determine what the largest range
of memory is that is visible by all devices (and hope that it's at
the start of physical memory).
Arnd
next prev parent reply other threads:[~2011-07-07 16:17 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-07-06 2:30 [PATCH 01/10] ARM: change ARM_DMA_ZONE_SIZE into a variable Nicolas Pitre
2011-07-06 2:30 ` [PATCH 02/10] ARM: add dma_zone_size to the machine_desc structure Nicolas Pitre
2011-07-06 23:10 ` Russell King - ARM Linux
2011-07-07 2:59 ` Nicolas Pitre
2011-07-06 2:30 ` [PATCH 03/10] ARM: mach-davinci: move from ARM_DMA_ZONE_SIZE to mdesc->dma_zone_size Nicolas Pitre
2011-07-06 2:30 ` [PATCH 04/10] ARM: mach-h720x: " Nicolas Pitre
2011-07-06 2:30 ` [PATCH 05/10] ARM: mach-ixp4xx: " Nicolas Pitre
2011-07-06 23:12 ` Russell King - ARM Linux
2011-07-07 3:31 ` Nicolas Pitre
2011-07-06 2:30 ` [PATCH 06/10] ARM: mach-pxa: " Nicolas Pitre
2011-07-06 2:30 ` [PATCH 07/10] ARM: mach-realview: " Nicolas Pitre
2011-07-06 23:15 ` Russell King - ARM Linux
2011-07-07 3:59 ` Nicolas Pitre
2011-07-06 2:30 ` [PATCH 08/10] ARM: mach-sa1100: move " Nicolas Pitre
2011-07-06 2:30 ` [PATCH 09/10] ARM: mach-shark: " Nicolas Pitre
2011-07-06 2:30 ` [PATCH 10/10] ARM: ARM_DMA_ZONE_SIZE is no more Nicolas Pitre
2011-07-06 2:48 ` [PATCH 01/10] ARM: change ARM_DMA_ZONE_SIZE into a variable Barry Song
2011-07-06 3:12 ` Nicolas Pitre
2011-07-06 23:09 ` Russell King - ARM Linux
2011-07-07 2:50 ` Nicolas Pitre
2011-07-07 16:17 ` Arnd Bergmann [this message]
2011-07-07 17:08 ` John Linn
2011-07-07 17:40 ` Arnd Bergmann
2011-07-08 8:59 ` Russell King - ARM Linux
2011-07-08 13:58 ` John Linn
2011-07-08 16:23 ` Russell King - ARM Linux
2011-07-07 18:15 ` Grant Likely
2011-07-06 23:04 ` Russell King - ARM Linux
2011-07-07 2:46 ` Nicolas Pitre
2011-07-08 12:14 ` Russell King - ARM Linux
2011-07-08 20:30 ` Russell King - ARM Linux
2011-07-09 8:12 ` Russell King - ARM Linux
2011-07-09 8:13 ` Russell King - ARM Linux
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