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ARM: add coherent dma ops

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arch_is_coherent is problematic as it is a global symbol. This
doesn't work for multi-platform kernels or platforms which can support
per device coherent DMA.

This adds arm_coherent_dma_ops to be used for devices which connected
coherently (i.e. to the ACP port on Cortex-A9 or A15). The arm_dma_ops
are modified at boot when arch_is_coherent is true.

Signed-off-by: Rob Herring <rob.herring@calxeda.com>
Cc: Russell King <linux@arm.linux.org.uk>
Cc: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
This commit is contained in:
Rob Herring
2012-08-21 12:20:17 +02:00
committed by Marek Szyprowski
parent a0d271cbfe
commit dd37e9405a
2 changed files with 60 additions and 12 deletions
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1
arch/arm/include/asm/dma-mapping.h
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@@ -13,6 +13,7 @@
#define DMA_ERROR_CODE (~0)
extern struct dma_map_ops arm_dma_ops;
extern struct dma_map_ops arm_coherent_dma_ops;
static inline struct dma_map_ops *get_dma_ops(struct device *dev)
{