Commit a3a60f81 authored by Will Deacon's avatar Will Deacon
Browse files

dma-mapping: replace set_arch_dma_coherent_ops with arch_setup_dma_ops 



set_arch_dma_coherent_ops is called from of_dma_configure in order to
swizzle the architectural dma-mapping functions over to a cache-coherent
implementation. This is currently implemented only for ARM.

In anticipation of re-using this mechanism for IOMMU-backed dma-mapping
ops too, this patch replaces the function with a broader
arch_setup_dma_ops callback which will be extended in future.

Acked-by: default avatarArnd Bergmann <arnd@arndb.de>
Acked-by: default avatarMarek Szyprowski <m.szyprowski@samsung.com>
Tested-by: default avatarRobin Murphy <robin.murphy@arm.com>
Signed-off-by: default avatarWill Deacon <will.deacon@arm.com>
parent 1cd076bf

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

+4 −4
Original line number Diff line number Diff line
@@ -121,12 +121,12 @@ static inline unsigned long dma_max_pfn(struct device *dev) 
}

#define dma_max_pfn(dev) dma_max_pfn(dev)



static inline int set_arch_dma_coherent_ops(struct device *dev)

static inline void arch_setup_dma_ops(struct device *dev, bool coherent)

{

	if (coherent)

		set_dma_ops(dev, &arm_coherent_dma_ops);

	return 0;

}

#define set_arch_dma_coherent_ops(dev)	set_arch_dma_coherent_ops(dev)

#define arch_setup_dma_ops arch_setup_dma_ops



static inline dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr)

{

drivers/of/platform.c

+13 −18
Original line number Diff line number Diff line
@@ -164,6 +164,8 @@ static void of_dma_configure(struct device *dev) 
{

	u64 dma_addr, paddr, size;

	int ret;

	bool coherent;

	unsigned long offset;



	/*

	 * Set default dma-mask to 32 bit. Drivers are expected to setup
@@ -178,28 +180,21 @@ static void of_dma_configure(struct device *dev) 
	if (!dev->dma_mask)

		dev->dma_mask = &dev->coherent_dma_mask;



	/*

	 * if dma-coherent property exist, call arch hook to setup

	 * dma coherent operations.

	 */

	if (of_dma_is_coherent(dev->of_node)) {

		set_arch_dma_coherent_ops(dev);

		dev_dbg(dev, "device is dma coherent\n");

	}



	/*

	 * if dma-ranges property doesn't exist - just return else

	 * setup the dma offset

	 */

	ret = of_dma_get_range(dev->of_node, &dma_addr, &paddr, &size);

	if (ret < 0) {

		dev_dbg(dev, "no dma range information to setup\n");

		return;

		dma_addr = offset = 0;

		size = dev->coherent_dma_mask;

	} else {

		offset = PFN_DOWN(paddr - dma_addr);

		dev_dbg(dev, "dma_pfn_offset(%#08lx)\n", dev->dma_pfn_offset);

	}

	dev->dma_pfn_offset = offset;



	/* DMA ranges found. Calculate and set dma_pfn_offset */

	dev->dma_pfn_offset = PFN_DOWN(paddr - dma_addr);

	dev_dbg(dev, "dma_pfn_offset(%#08lx)\n", dev->dma_pfn_offset);

	coherent = of_dma_is_coherent(dev->of_node);

	dev_dbg(dev, "device is%sdma coherent\n",

		coherent ? " " : " not ");



	arch_setup_dma_ops(dev, coherent);

}



/**

include/linux/dma-mapping.h

+2 −5
Original line number Diff line number Diff line
@@ -129,11 +129,8 @@ static inline int dma_coerce_mask_and_coherent(struct device *dev, u64 mask) 


extern u64 dma_get_required_mask(struct device *dev);



#ifndef set_arch_dma_coherent_ops

static inline int set_arch_dma_coherent_ops(struct device *dev)

{

	return 0;

}

#ifndef arch_setup_dma_ops

static inline void arch_setup_dma_ops(struct device *dev, bool coherent) { }

#endif



static inline unsigned int dma_get_max_seg_size(struct device *dev)

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