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authorOlof Johansson <olof@lixom.net>2015-01-29 13:52:52 -0800
committerOlof Johansson <olof@lixom.net>2015-01-29 13:52:52 -0800
commitd073d7a1460ae1ae56a81bbb0a58d6f17917ca51 (patch)
tree03a554995f61bd8f12d3508eae58011e0a6067e3 /Documentation/arm
parent03773a4c177ab55a1e58bacef96f07d6074c26bd (diff)
parentd50b9e2e788dce9b120b5ac1140f0cdd1bf905eb (diff)
downloadlinux-d073d7a1460ae1ae56a81bbb0a58d6f17917ca51.tar.bz2
Merge tag 'samsung-cleanup' of git://git.kernel.org/pub/scm/linux/kernel/git/kgene/linux-samsung into next/cleanup
Merge "Samsung cleanup for v3.20" from Kukjin Kim: - remove i2c sys configuration from mach-exynos/ : all related codes moved into i2c driver - remove Samsung specific DMA : every Samsung stuff uses dmaengine APIs * tag 'samsung-cleanup' of git://git.kernel.org/pub/scm/linux/kernel/git/kgene/linux-samsung: ARM: SAMSUNG: remove unused DMA infrastructure ARM: EXYNOS: Remove i2c sys configuration related code Signed-off-by: Olof Johansson <olof@lixom.net>
Diffstat (limited to 'Documentation/arm')
-rw-r--r--Documentation/arm/Samsung-S3C24XX/DMA.txt46
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diff --git a/Documentation/arm/Samsung-S3C24XX/DMA.txt b/Documentation/arm/Samsung-S3C24XX/DMA.txt
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- S3C2410 DMA
- ===========
-
-Introduction
-------------
-
- The kernel provides an interface to manage DMA transfers
- using the DMA channels in the CPU, so that the central
- duty of managing channel mappings, and programming the
- channel generators is in one place.
-
-
-DMA Channel Ordering
---------------------
-
- Many of the range do not have connections for the DMA
- channels to all sources, which means that some devices
- have a restricted number of channels that can be used.
-
- To allow flexibility for each CPU type and board, the
- DMA code can be given a DMA ordering structure which
- allows the order of channel search to be specified, as
- well as allowing the prohibition of certain claims.
-
- struct s3c24xx_dma_order has a list of channels, and
- each channel within has a slot for a list of DMA
- channel numbers. The slots are searched in order for
- the presence of a DMA channel number with DMA_CH_VALID
- or-ed in.
-
- If the order has the flag DMA_CH_NEVER set, then after
- checking the channel list, the system will return no
- found channel, thus denying the request.
-
- A board support file can call s3c24xx_dma_order_set()
- to register a complete ordering set. The routine will
- copy the data, so the original can be discarded with
- __initdata.
-
-
-Authour
--------
-
-Ben Dooks,
-Copyright (c) 2007 Ben Dooks, Simtec Electronics
-Licensed under the GPL v2