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arm: introduce is_device_dma_coherent

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Introduce a boolean flag and an accessor function to check whether a
device is dma_coherent. Set the flag from set_arch_dma_coherent_ops.

Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Acked-by: Russell King <linux@arm.linux.org.uk>
This commit is contained in:
Stefano Stabellini 2014-11-20 10:41:40 +00:00 committed by David Vrabel
parent de7ee503f2
commit 3d5391ac6f
2 changed files with 8 additions and 0 deletions
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1
arch/arm/include/asm/device.h
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@ -17,6 +17,7 @@ struct dev_archdata {
#ifdef CONFIG_ARM_DMA_USE_IOMMU
struct dma_iommu_mapping *mapping;
#endif
bool dma_coherent;
};
struct omap_device;

7
arch/arm/include/asm/dma-mapping.h
View File

@ -123,11 +123,18 @@ static inline unsigned long dma_max_pfn(struct device *dev)
static inline int set_arch_dma_coherent_ops(struct device *dev)
{
dev->archdata.dma_coherent = true;
set_dma_ops(dev, &arm_coherent_dma_ops);
return 0;
}
#define set_arch_dma_coherent_ops(dev) set_arch_dma_coherent_ops(dev)
/* do not use this function in a driver */
static inline bool is_device_dma_coherent(struct device *dev)
{
return dev->archdata.dma_coherent;
}
static inline dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr)
{
unsigned int offset = paddr & ~PAGE_MASK;