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dma-mapping: replace set_arch_dma_coherent_ops with arch_setup_dma_ops

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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: Arnd Bergmann <arnd@arndb.de>
Acked-by: Marek Szyprowski <m.szyprowski@samsung.com>
Tested-by: Robin Murphy <robin.murphy@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
This commit is contained in:
Will Deacon 2014-08-27 15:49:10 +01:00
parent 1cd076bf67
commit a3a60f81ee
3 changed files with 19 additions and 27 deletions
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8
arch/arm/include/asm/dma-mapping.h
View File

@ -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)
{
set_dma_ops(dev, &arm_coherent_dma_ops);
return 0;
if (coherent)
set_dma_ops(dev, &arm_coherent_dma_ops);
}
#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)
{

31
drivers/of/platform.c
View File

@ -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);
}
/**

7
include/linux/dma-mapping.h
View File

@ -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)