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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-ks8695/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-ks8695/include')
-rw-r--r--arch/arm/mach-ks8695/include/mach/memory.h6
1 files changed, 5 insertions, 1 deletions
diff --git a/arch/arm/mach-ks8695/include/mach/memory.h b/arch/arm/mach-ks8695/include/mach/memory.h
index 6d5887cf5742..76e5308685a4 100644
--- a/arch/arm/mach-ks8695/include/mach/memory.h
+++ b/arch/arm/mach-ks8695/include/mach/memory.h
@@ -35,7 +35,11 @@ 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) __arch_virt_to_dma(dev, page_address(x))
+#define __arch_page_to_dma(dev, x) \
+ ({ dma_addr_t __dma = page_to_phys(page); \
+ if (!is_lbus_device(dev)) \
+ __dma = __dma - PHYS_OFFSET + KS8695_PCIMEM_PA; \
+ __dma; })
#endif