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powerpc: Rename get_dma_direct_offset get_dma_offset

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The former is no longer really accurate with the swiotlb case now
a possibility.  I also move it into dma-mapping.h - it no longer
needs to be in dma.c, and there are about to be some more accessors
that should all end up in the same place.  A comment is added to
indicate that this function is not used in configs where there is no
simple dma offset, such as the iommu case.

Signed-off-by: Becky Bruce <beckyb@kernel.crashing.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Becky Bruce
2009-09-21 08:26:34 +00:00
committed by Benjamin Herrenschmidt
parent b9eceb2307
commit 1cebd7a0f6
2 changed files with 22 additions and 14 deletions
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21
arch/powerpc/include/asm/dma-mapping.h
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@ -26,7 +26,6 @@ extern void *dma_direct_alloc_coherent(struct device *dev, size_t size,
extern void dma_direct_free_coherent(struct device *dev, size_t size,
void *vaddr, dma_addr_t dma_handle);
extern unsigned long get_dma_direct_offset(struct device *dev);
#ifdef CONFIG_NOT_COHERENT_CACHE
/*
@ -90,6 +89,22 @@ static inline void set_dma_ops(struct device *dev, struct dma_map_ops *ops)
dev->archdata.dma_ops = ops;
}
/*
* get_dma_offset()
*
* Get the dma offset on configurations where the dma address can be determined
* from the physical address by looking at a simple offset. Direct dma and
* swiotlb use this function, but it is typically not used by implementations
* with an iommu.
*/
static inline unsigned long get_dma_offset(struct device *dev)
{
if (dev)
return (unsigned long)dev->archdata.dma_data;
return PCI_DRAM_OFFSET;
}
/* this will be removed soon */
#define flush_write_buffers()
@ -181,12 +196,12 @@ static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size)
static inline dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr)
{
return paddr + get_dma_direct_offset(dev);
return paddr + get_dma_offset(dev);
}
static inline phys_addr_t dma_to_phys(struct device *dev, dma_addr_t daddr)
{
return daddr - get_dma_direct_offset(dev);
return daddr - get_dma_offset(dev);
}
#define dma_alloc_noncoherent(d, s, h, f) dma_alloc_coherent(d, s, h, f)