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ARM: DMA: Replace page_to_dma()/dma_to_page() with pfn_to_dma()/dma_to_pfn()

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Replace the page_to_dma() and dma_to_page() macros with their PFN
equivalents.  This allows us to map parts of memory which do not have
a struct page allocated to them to bus addresses.  This will be used
internally by dma_alloc_coherent()/dma_alloc_writecombine().

Build tested on Versatile, OMAP1, IOP13xx and KS8695.

Tested-by: Janusz Krzysztofik <jkrzyszt@tis.icnet.pl>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Russell King
2011-01-03 00:00:17 +00:00
parent 3d29005ab8
commit 9eedd96301
5 changed files with 32 additions and 28 deletions
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34
arch/arm/include/asm/dma-mapping.h
View File

@ -9,20 +9,24 @@
#include <asm-generic/dma-coherent.h>
#include <asm/memory.h>
#ifdef __arch_page_to_dma
#error Please update to __arch_pfn_to_dma
#endif
/*
* page_to_dma/dma_to_virt/virt_to_dma are architecture private functions
* used internally by the DMA-mapping API to provide DMA addresses. They
* must not be used by drivers.
* dma_to_pfn/pfn_to_dma/dma_to_virt/virt_to_dma are architecture private
* functions used internally by the DMA-mapping API to provide DMA
* addresses. They must not be used by drivers.
*/
#ifndef __arch_page_to_dma
static inline dma_addr_t page_to_dma(struct device *dev, struct page *page)
#ifndef __arch_pfn_to_dma
static inline dma_addr_t pfn_to_dma(struct device *dev, unsigned long pfn)
{
return (dma_addr_t)__pfn_to_bus(page_to_pfn(page));
return (dma_addr_t)__pfn_to_bus(pfn);
}
static inline struct page *dma_to_page(struct device *dev, dma_addr_t addr)
static inline unsigned long dma_to_pfn(struct device *dev, dma_addr_t addr)
{
return pfn_to_page(__bus_to_pfn(addr));
return __bus_to_pfn(addr);
}
static inline void *dma_to_virt(struct device *dev, dma_addr_t addr)
@ -35,14 +39,14 @@ static inline dma_addr_t virt_to_dma(struct device *dev, void *addr)
return (dma_addr_t)__virt_to_bus((unsigned long)(addr));
}
#else
static inline dma_addr_t page_to_dma(struct device *dev, struct page *page)
static inline dma_addr_t pfn_to_dma(struct device *dev, unsigned long pfn)
{
return __arch_page_to_dma(dev, page);
return __arch_pfn_to_dma(dev, pfn);
}
static inline struct page *dma_to_page(struct device *dev, dma_addr_t addr)
static inline unsigned long dma_to_pfn(struct device *dev, dma_addr_t addr)
{
return __arch_dma_to_page(dev, addr);
return __arch_dma_to_pfn(dev, addr);
}
static inline void *dma_to_virt(struct device *dev, dma_addr_t addr)
@ -368,7 +372,7 @@ static inline dma_addr_t dma_map_page(struct device *dev, struct page *page,
__dma_page_cpu_to_dev(page, offset, size, dir);
return page_to_dma(dev, page) + offset;
return pfn_to_dma(dev, page_to_pfn(page)) + offset;
}
/**
@ -408,8 +412,8 @@ static inline void dma_unmap_single(struct device *dev, dma_addr_t handle,
static inline void dma_unmap_page(struct device *dev, dma_addr_t handle,
size_t size, enum dma_data_direction dir)
{
__dma_page_dev_to_cpu(dma_to_page(dev, handle), handle & ~PAGE_MASK,
size, dir);
__dma_page_dev_to_cpu(pfn_to_page(dma_to_pfn(dev, handle)),
handle & ~PAGE_MASK, size, dir);
}
#endif /* CONFIG_DMABOUNCE */