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rapidio: add DMA engine support for RIO data transfers

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Adds DMA Engine framework support into RapidIO subsystem.

Uses DMA Engine DMA_SLAVE interface to generate data transfers to/from
remote RapidIO target devices.

Introduces RapidIO-specific wrapper for prep_slave_sg() interface with an
extra parameter to pass target specific information.

Uses scatterlist to describe local data buffer.  Address flat data buffer
on a remote side.

Signed-off-by: Alexandre Bounine <alexandre.bounine@idt.com>
Cc: Dan Williams <dan.j.williams@intel.com>
Acked-by: Vinod Koul <vinod.koul@linux.intel.com>
Cc: Li Yang <leoli@freescale.com>
Cc: Matt Porter <mporter@kernel.crashing.org>
Cc: Paul Gortmaker <paul.gortmaker@windriver.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Alexandre Bounine
2012-05-31 16:26:38 -07:00
committed by Linus Torvalds
parent ce2d52cc13
commit e42d98ebe7
5 changed files with 163 additions and 0 deletions
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14
drivers/rapidio/Kconfig
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@@ -22,6 +22,20 @@ config RAPIDIO_ENABLE_RX_TX_PORTS
ports for Input/Output direction to allow other traffic
than Maintenance transfers.
config RAPIDIO_DMA_ENGINE
bool "DMA Engine support for RapidIO"
depends on RAPIDIO
select DMADEVICES
select DMA_ENGINE
help
Say Y here if you want to use DMA Engine frameork for RapidIO data
transfers to/from target RIO devices. RapidIO uses NREAD and
NWRITE (NWRITE_R, SWRITE) requests to transfer data between local
memory and memory on remote target device. You need a DMA controller
capable to perform data transfers to/from RapidIO.
If you are unsure about this, say Y here.
config RAPIDIO_DEBUG
bool "RapidIO subsystem debug messages"
depends on RAPIDIO