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authorNicolas Pitre <nico@cam.org>2008-09-09 15:54:13 -0400
committerNicolas Pitre <nico@cam.org>2009-03-15 21:01:21 -0400
commit58edb515724f9e63e569536d01ac8d8f8ddb367a (patch)
tree627d3eafefd38b031e776b48d8d04d764912ec92 /arch/arm/include/asm/memory.h
parent[ARM] introduce dma_cache_maint_page() (diff)
downloadlinux-dev-58edb515724f9e63e569536d01ac8d8f8ddb367a.tar.xz
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[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/include/asm/memory.h')
-rw-r--r--arch/arm/include/asm/memory.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/arm/include/asm/memory.h b/arch/arm/include/asm/memory.h
index ae472bc376d3..85763db87449 100644
--- a/arch/arm/include/asm/memory.h
+++ b/arch/arm/include/asm/memory.h
@@ -188,6 +188,7 @@ static inline void *phys_to_virt(unsigned long x)
#ifndef __virt_to_bus
#define __virt_to_bus __virt_to_phys
#define __bus_to_virt __phys_to_virt
+#define __pfn_to_bus(x) ((x) << PAGE_SHIFT)
#endif
static inline __deprecated unsigned long virt_to_bus(void *x)