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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 */

6
arch/arm/mach-iop13xx/include/mach/memory.h
View File

@ -58,13 +58,13 @@ static inline unsigned long __lbus_to_virt(dma_addr_t x)
__dma; \
})
#define __arch_page_to_dma(dev, page) \
#define __arch_pfn_to_dma(dev, pfn) \
({ \
/* __is_lbus_virt() can never be true for RAM pages */ \
(dma_addr_t)page_to_phys(page); \
(dma_addr_t)__pfn_to_phys(pfn); \
})
#define __arch_dma_to_page(dev, addr) phys_to_page(addr)
#define __arch_dma_to_pfn(dev, addr) __phys_to_pfn(addr)
#endif /* CONFIG_ARCH_IOP13XX */
#endif /* !ASSEMBLY */

8
arch/arm/mach-ks8695/include/mach/memory.h
View File

@ -35,17 +35,17 @@ extern struct bus_type platform_bus_type;
__phys_to_virt(x) : __bus_to_virt(x)); })
#define __arch_virt_to_dma(dev, x) ({ is_lbus_device(dev) ? \
(dma_addr_t)__virt_to_phys(x) : (dma_addr_t)__virt_to_bus(x); })
#define __arch_page_to_dma(dev, x) \
({ dma_addr_t __dma = page_to_phys(page); \
#define __arch_pfn_to_dma(dev, pfn) \
({ dma_addr_t __dma = __pfn_to_phys(pfn); \
if (!is_lbus_device(dev)) \
__dma = __dma - PHYS_OFFSET + KS8695_PCIMEM_PA; \
__dma; })
#define __arch_dma_to_page(dev, x) \
#define __arch_dma_to_pfn(dev, x) \
({ dma_addr_t __dma = x; \
if (!is_lbus_device(dev)) \
__dma += PHYS_OFFSET - KS8695_PCIMEM_PA; \
phys_to_page(__dma); \
__phys_to_pfn(__dma); \
})
#endif

4
arch/arm/mm/dma-mapping.c
View File

@ -311,7 +311,7 @@ __dma_alloc(struct device *dev, size_t size, dma_addr_t *handle, gfp_t gfp,
addr = page_address(page);
if (addr)
*handle = page_to_dma(dev, page);
*handle = pfn_to_dma(dev, page_to_pfn(page));
return addr;
}
@ -406,7 +406,7 @@ void dma_free_coherent(struct device *dev, size_t size, void *cpu_addr, dma_addr
if (!arch_is_coherent())
__dma_free_remap(cpu_addr, size);
__dma_free_buffer(dma_to_page(dev, handle), size);
__dma_free_buffer(pfn_to_page(dma_to_pfn(dev, handle)), size);
}
EXPORT_SYMBOL(dma_free_coherent);

8
arch/arm/plat-omap/include/plat/memory.h
View File

@ -61,17 +61,17 @@
#define lbus_to_virt(x) ((x) - OMAP1510_LB_OFFSET + PAGE_OFFSET)
#define is_lbus_device(dev) (cpu_is_omap15xx() && dev && (strncmp(dev_name(dev), "ohci", 4) == 0))
#define __arch_page_to_dma(dev, page) \
({ dma_addr_t __dma = page_to_phys(page); \
#define __arch_pfn_to_dma(dev, pfn) \
({ dma_addr_t __dma = __pfn_to_phys(pfn); \
if (is_lbus_device(dev)) \
__dma = __dma - PHYS_OFFSET + OMAP1510_LB_OFFSET; \
__dma; })
#define __arch_dma_to_page(dev, addr) \
#define __arch_dma_to_pfn(dev, addr) \
({ dma_addr_t __dma = addr; \
if (is_lbus_device(dev)) \
__dma += PHYS_OFFSET - OMAP1510_LB_OFFSET; \
phys_to_page(__dma); \
__phys_to_pfn(__dma); \
})
#define __arch_dma_to_virt(dev, addr) ({ (void *) (is_lbus_device(dev) ? \