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Commit 3d5391ac authored by Stefano Stabellini's avatar Stefano Stabellini Committed by David Vrabel
Browse files

arm: introduce is_device_dma_coherent 



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: default avatarStefano Stabellini <stefano.stabellini@eu.citrix.com>
Signed-off-by: default avatarCatalin Marinas <catalin.marinas@arm.com>
Reviewed-by: default avatarCatalin Marinas <catalin.marinas@arm.com>
Acked-by: default avatarRussell King <linux@arm.linux.org.uk>
parent de7ee503

arch/arm/include/asm/device.h

+1 −0
Original line number Diff line number Diff line
@@ -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;

arch/arm/include/asm/dma-mapping.h

+7 −0
Original line number Diff line number Diff line
@@ -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;