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authorNicolas Pitre <nico@cam.org>2008-09-09 21:54:13 +0200
committerNicolas Pitre <nico@cam.org>2009-03-16 02:01:21 +0100
commit58edb515724f9e63e569536d01ac8d8f8ddb367a (patch)
tree627d3eafefd38b031e776b48d8d04d764912ec92 /arch/arm/mach-iop13xx/include
parent[ARM] introduce dma_cache_maint_page() (diff)
downloadlinux-58edb515724f9e63e569536d01ac8d8f8ddb367a.tar.xz
linux-58edb515724f9e63e569536d01ac8d8f8ddb367a.zip
[ARM] make page_to_dma() highmem aware
If a machine class has a custom __virt_to_bus() implementation then it must provide a __arch_page_to_dma() implementation as well which is _not_ based on page_address() to support highmem. This patch fixes existing __arch_page_to_dma() and provide a default implementation otherwise. The default implementation for highmem is based on __pfn_to_bus() which is defined only when no custom __virt_to_bus() is provided by the machine class. That leaves only ebsa110 and footbridge which cannot support highmem until they provide their own __arch_page_to_dma() implementation. But highmem support on those legacy platforms with limited memory is certainly not a priority. Signed-off-by: Nicolas Pitre <nico@marvell.com>
Diffstat (limited to 'arch/arm/mach-iop13xx/include')
-rw-r--r--arch/arm/mach-iop13xx/include/mach/memory.h5
1 files changed, 4 insertions, 1 deletions
diff --git a/arch/arm/mach-iop13xx/include/mach/memory.h b/arch/arm/mach-iop13xx/include/mach/memory.h
index e012bf13c955..42ae29b288a1 100644
--- a/arch/arm/mach-iop13xx/include/mach/memory.h
+++ b/arch/arm/mach-iop13xx/include/mach/memory.h
@@ -59,7 +59,10 @@ static inline unsigned long __lbus_to_virt(dma_addr_t x)
})
#define __arch_page_to_dma(dev, page) \
- __arch_virt_to_dma(dev, page_address(page))
+ ({ \
+ /* __is_lbus_virt() can never be true for RAM pages */ \
+ (dma_addr_t)page_to_phys(page); \
+ })
#endif /* CONFIG_ARCH_IOP13XX */
#endif /* !ASSEMBLY */