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authorRussell King <rmk+kernel@arm.linux.org.uk>2012-01-09 21:44:07 +0000
committerRussell King <rmk+kernel@arm.linux.org.uk>2012-03-07 11:32:21 +0000
commit6365bead25efc84a4cf4aa9b0a7638f8a970cdff (patch)
tree3dc5a72a6f25a48dfea6842b9e11af1b209ccec2 /drivers/dma/Kconfig
parentd65b4e98d7ea3038b767b70fe8be959b2913f16d (diff)
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DMA: sa11x0: add SA-11x0 DMA driver
Add support for the SA-11x0 DMA driver, which replaces the private API version in arch/arm/mach-sa1100/dma.c. We model this as a set of virtual DMA channels, one for each request signal, and assign the virtual DMA channel to a physical DMA channel when there is work to be done. This allows DMA users to claim their channels, and hold them while not in use, without affecting the availability of the physical channels. Another advantage over this approach, compared to the private version, is that a channel can be reconfigured on the fly without having to release and re-request it - which for the IrDA driver, allows us to use DMA for SIR mode transmit without eating up three physical channels. As IrDA is half-duplex, we actually only need one physical channel, and this architecture allows us to achieve that. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'drivers/dma/Kconfig')
-rw-r--r--drivers/dma/Kconfig9
1 files changed, 9 insertions, 0 deletions
diff --git a/drivers/dma/Kconfig b/drivers/dma/Kconfig
index f1a2749..4a6c46d 100644
--- a/drivers/dma/Kconfig
+++ b/drivers/dma/Kconfig
@@ -252,6 +252,15 @@ config EP93XX_DMA
help
Enable support for the Cirrus Logic EP93xx M2P/M2M DMA controller.
+config DMA_SA11X0
+ tristate "SA-11x0 DMA support"
+ depends on ARCH_SA1100
+ select DMA_ENGINE
+ help
+ Support the DMA engine found on Intel StrongARM SA-1100 and
+ SA-1110 SoCs. This DMA engine can only be used with on-chip
+ devices.
+
config DMA_ENGINE
bool